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a1ab4c31 AC |
1 | /**************************************************************************** |
2 | * * | |
3 | * GNAT COMPILER COMPONENTS * | |
4 | * * | |
5 | * T R A N S * | |
6 | * * | |
7 | * C Implementation File * | |
8 | * * | |
7c775aca | 9 | * Copyright (C) 1992-2016, Free Software Foundation, Inc. * |
a1ab4c31 AC |
10 | * * |
11 | * GNAT is free software; you can redistribute it and/or modify it under * | |
12 | * terms of the GNU General Public License as published by the Free Soft- * | |
748086b7 | 13 | * ware Foundation; either version 3, or (at your option) any later ver- * |
a1ab4c31 AC |
14 | * sion. GNAT is distributed in the hope that it will be useful, but WITH- * |
15 | * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * | |
16 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * | |
17 | * for more details. You should have received a copy of the GNU General * | |
748086b7 JJ |
18 | * Public License distributed with GNAT; see file COPYING3. If not see * |
19 | * <http://www.gnu.org/licenses/>. * | |
a1ab4c31 AC |
20 | * * |
21 | * GNAT was originally developed by the GNAT team at New York University. * | |
22 | * Extensive contributions were provided by Ada Core Technologies Inc. * | |
23 | * * | |
24 | ****************************************************************************/ | |
25 | ||
26 | #include "config.h" | |
27 | #include "system.h" | |
28 | #include "coretypes.h" | |
2adfab87 AM |
29 | #include "target.h" |
30 | #include "function.h" | |
31 | #include "bitmap.h" | |
a1ab4c31 | 32 | #include "tree.h" |
2adfab87 | 33 | #include "gimple-expr.h" |
d8a2d370 | 34 | #include "stringpool.h" |
2adfab87 | 35 | #include "cgraph.h" |
64235766 | 36 | #include "predict.h" |
2adfab87 AM |
37 | #include "diagnostic.h" |
38 | #include "alias.h" | |
39 | #include "fold-const.h" | |
d8a2d370 DN |
40 | #include "stor-layout.h" |
41 | #include "stmt.h" | |
42 | #include "varasm.h" | |
a1ab4c31 | 43 | #include "output.h" |
d477d1fe | 44 | #include "libfuncs.h" /* For set_stack_check_libfunc. */ |
a1ab4c31 | 45 | #include "tree-iterator.h" |
2fb9a547 | 46 | #include "gimplify.h" |
f2423384 | 47 | #include "opts.h" |
48a24fcf | 48 | #include "common/common-target.h" |
8713b7e4 | 49 | |
a1ab4c31 | 50 | #include "ada.h" |
8713b7e4 | 51 | #include "adadecode.h" |
a1ab4c31 AC |
52 | #include "types.h" |
53 | #include "atree.h" | |
a1ab4c31 AC |
54 | #include "namet.h" |
55 | #include "nlists.h" | |
56 | #include "snames.h" | |
57 | #include "stringt.h" | |
58 | #include "uintp.h" | |
59 | #include "urealp.h" | |
60 | #include "fe.h" | |
61 | #include "sinfo.h" | |
62 | #include "einfo.h" | |
831f44c6 | 63 | #include "gadaint.h" |
a1ab4c31 AC |
64 | #include "ada-tree.h" |
65 | #include "gigi.h" | |
a1ab4c31 AC |
66 | |
67 | /* We should avoid allocating more than ALLOCA_THRESHOLD bytes via alloca, | |
68 | for fear of running out of stack space. If we need more, we use xmalloc | |
69 | instead. */ | |
70 | #define ALLOCA_THRESHOLD 1000 | |
71 | ||
831f44c6 | 72 | /* Pointers to front-end tables accessed through macros. */ |
a1ab4c31 | 73 | struct Node *Nodes_Ptr; |
4bcf6815 | 74 | struct Flags *Flags_Ptr; |
a1ab4c31 AC |
75 | Node_Id *Next_Node_Ptr; |
76 | Node_Id *Prev_Node_Ptr; | |
77 | struct Elist_Header *Elists_Ptr; | |
78 | struct Elmt_Item *Elmts_Ptr; | |
79 | struct String_Entry *Strings_Ptr; | |
80 | Char_Code *String_Chars_Ptr; | |
81 | struct List_Header *List_Headers_Ptr; | |
82 | ||
831f44c6 EB |
83 | /* Highest number in the front-end node table. */ |
84 | int max_gnat_nodes; | |
85 | ||
86 | /* Current node being treated, in case abort called. */ | |
87 | Node_Id error_gnat_node; | |
a1ab4c31 | 88 | |
1e17ef87 | 89 | /* True when gigi is being called on an analyzed but unexpanded |
a1ab4c31 | 90 | tree, and the only purpose of the call is to properly annotate |
1e17ef87 | 91 | types with representation information. */ |
a1ab4c31 AC |
92 | bool type_annotate_only; |
93 | ||
f04b8d69 | 94 | /* List of N_Validate_Unchecked_Conversion nodes in the unit. */ |
9771b263 | 95 | static vec<Node_Id> gnat_validate_uc_list; |
f04b8d69 | 96 | |
a1ab4c31 AC |
97 | /* When not optimizing, we cache the 'First, 'Last and 'Length attributes |
98 | of unconstrained array IN parameters to avoid emitting a great deal of | |
99 | redundant instructions to recompute them each time. */ | |
6bf68a93 | 100 | struct GTY (()) parm_attr_d { |
a1ab4c31 AC |
101 | int id; /* GTY doesn't like Entity_Id. */ |
102 | int dim; | |
103 | tree first; | |
104 | tree last; | |
105 | tree length; | |
106 | }; | |
107 | ||
6bf68a93 | 108 | typedef struct parm_attr_d *parm_attr; |
a1ab4c31 | 109 | |
a1ab4c31 | 110 | |
d1b38208 | 111 | struct GTY(()) language_function { |
9771b263 | 112 | vec<parm_attr, va_gc> *parm_attr_cache; |
71196d4e | 113 | bitmap named_ret_val; |
9771b263 | 114 | vec<tree, va_gc> *other_ret_val; |
088b91c7 | 115 | int gnat_ret; |
a1ab4c31 AC |
116 | }; |
117 | ||
118 | #define f_parm_attr_cache \ | |
119 | DECL_STRUCT_FUNCTION (current_function_decl)->language->parm_attr_cache | |
120 | ||
71196d4e EB |
121 | #define f_named_ret_val \ |
122 | DECL_STRUCT_FUNCTION (current_function_decl)->language->named_ret_val | |
123 | ||
124 | #define f_other_ret_val \ | |
125 | DECL_STRUCT_FUNCTION (current_function_decl)->language->other_ret_val | |
126 | ||
088b91c7 EB |
127 | #define f_gnat_ret \ |
128 | DECL_STRUCT_FUNCTION (current_function_decl)->language->gnat_ret | |
129 | ||
a1ab4c31 AC |
130 | /* A structure used to gather together information about a statement group. |
131 | We use this to gather related statements, for example the "then" part | |
132 | of a IF. In the case where it represents a lexical scope, we may also | |
133 | have a BLOCK node corresponding to it and/or cleanups. */ | |
134 | ||
d1b38208 | 135 | struct GTY((chain_next ("%h.previous"))) stmt_group { |
a1ab4c31 | 136 | struct stmt_group *previous; /* Previous code group. */ |
1e17ef87 EB |
137 | tree stmt_list; /* List of statements for this code group. */ |
138 | tree block; /* BLOCK for this code group, if any. */ | |
a1ab4c31 AC |
139 | tree cleanups; /* Cleanups for this code group, if any. */ |
140 | }; | |
141 | ||
142 | static GTY(()) struct stmt_group *current_stmt_group; | |
143 | ||
144 | /* List of unused struct stmt_group nodes. */ | |
145 | static GTY((deletable)) struct stmt_group *stmt_group_free_list; | |
146 | ||
147 | /* A structure used to record information on elaboration procedures | |
148 | we've made and need to process. | |
149 | ||
150 | ??? gnat_node should be Node_Id, but gengtype gets confused. */ | |
151 | ||
d1b38208 | 152 | struct GTY((chain_next ("%h.next"))) elab_info { |
1e17ef87 | 153 | struct elab_info *next; /* Pointer to next in chain. */ |
a1ab4c31 AC |
154 | tree elab_proc; /* Elaboration procedure. */ |
155 | int gnat_node; /* The N_Compilation_Unit. */ | |
156 | }; | |
157 | ||
158 | static GTY(()) struct elab_info *elab_info_list; | |
159 | ||
39f579c7 NF |
160 | /* Stack of exception pointer variables. Each entry is the VAR_DECL |
161 | that stores the address of the raised exception. Nonzero means we | |
162 | are in an exception handler. Not used in the zero-cost case. */ | |
9771b263 | 163 | static GTY(()) vec<tree, va_gc> *gnu_except_ptr_stack; |
a1ab4c31 | 164 | |
624e1688 AC |
165 | /* In ZCX case, current exception pointer. Used to re-raise it. */ |
166 | static GTY(()) tree gnu_incoming_exc_ptr; | |
167 | ||
39f579c7 | 168 | /* Stack for storing the current elaboration procedure decl. */ |
9771b263 | 169 | static GTY(()) vec<tree, va_gc> *gnu_elab_proc_stack; |
a1ab4c31 | 170 | |
39f579c7 NF |
171 | /* Stack of labels to be used as a goto target instead of a return in |
172 | some functions. See processing for N_Subprogram_Body. */ | |
9771b263 | 173 | static GTY(()) vec<tree, va_gc> *gnu_return_label_stack; |
a1ab4c31 | 174 | |
35a382b8 EB |
175 | /* Stack of variable for the return value of a function with copy-in/copy-out |
176 | parameters. See processing for N_Subprogram_Body. */ | |
9771b263 | 177 | static GTY(()) vec<tree, va_gc> *gnu_return_var_stack; |
35a382b8 | 178 | |
15bf7d19 EB |
179 | /* Structure used to record information for a range check. */ |
180 | struct GTY(()) range_check_info_d { | |
181 | tree low_bound; | |
182 | tree high_bound; | |
933a7325 EB |
183 | tree disp; |
184 | bool neg_p; | |
15bf7d19 EB |
185 | tree type; |
186 | tree invariant_cond; | |
64235766 | 187 | tree inserted_cond; |
15bf7d19 EB |
188 | }; |
189 | ||
190 | typedef struct range_check_info_d *range_check_info; | |
191 | ||
15bf7d19 EB |
192 | |
193 | /* Structure used to record information for a loop. */ | |
194 | struct GTY(()) loop_info_d { | |
633a3f2a | 195 | tree stmt; |
15bf7d19 | 196 | tree loop_var; |
87ab2b04 EB |
197 | tree low_bound; |
198 | tree high_bound; | |
9771b263 | 199 | vec<range_check_info, va_gc> *checks; |
87ab2b04 EB |
200 | bool artificial; |
201 | bool has_checks; | |
202 | bool warned_aggressive_loop_optimizations; | |
15bf7d19 EB |
203 | }; |
204 | ||
205 | typedef struct loop_info_d *loop_info; | |
206 | ||
15bf7d19 EB |
207 | |
208 | /* Stack of loop_info structures associated with LOOP_STMT nodes. */ | |
9771b263 | 209 | static GTY(()) vec<loop_info, va_gc> *gnu_loop_stack; |
a1ab4c31 | 210 | |
39f579c7 | 211 | /* The stacks for N_{Push,Pop}_*_Label. */ |
9771b263 DN |
212 | static GTY(()) vec<tree, va_gc> *gnu_constraint_error_label_stack; |
213 | static GTY(()) vec<tree, va_gc> *gnu_storage_error_label_stack; | |
214 | static GTY(()) vec<tree, va_gc> *gnu_program_error_label_stack; | |
a1ab4c31 AC |
215 | |
216 | /* Map GNAT tree codes to GCC tree codes for simple expressions. */ | |
217 | static enum tree_code gnu_codes[Number_Node_Kinds]; | |
218 | ||
a1ab4c31 AC |
219 | static void init_code_table (void); |
220 | static void Compilation_Unit_to_gnu (Node_Id); | |
102a1631 | 221 | static bool empty_stmt_list_p (tree); |
a1ab4c31 AC |
222 | static void record_code_position (Node_Id); |
223 | static void insert_code_for (Node_Id); | |
224 | static void add_cleanup (tree, Node_Id); | |
a1ab4c31 | 225 | static void add_stmt_list (List_Id); |
9771b263 | 226 | static void push_exception_label_stack (vec<tree, va_gc> **, Entity_Id); |
a1ab4c31 | 227 | static tree build_stmt_group (List_Id, bool); |
a712b009 | 228 | static inline bool stmt_group_may_fallthru (void); |
a1ab4c31 AC |
229 | static enum gimplify_status gnat_gimplify_stmt (tree *); |
230 | static void elaborate_all_entities (Node_Id); | |
231 | static void process_freeze_entity (Node_Id); | |
a1ab4c31 | 232 | static void process_decls (List_Id, List_Id, Node_Id, bool, bool); |
10069d53 | 233 | static tree emit_range_check (tree, Node_Id, Node_Id); |
10069d53 EB |
234 | static tree emit_check (tree, tree, int, Node_Id); |
235 | static tree build_unary_op_trapv (enum tree_code, tree, tree, Node_Id); | |
236 | static tree build_binary_op_trapv (enum tree_code, tree, tree, tree, Node_Id); | |
237 | static tree convert_with_check (Entity_Id, tree, bool, bool, bool, Node_Id); | |
a1ab4c31 AC |
238 | static bool addressable_p (tree, tree); |
239 | static tree assoc_to_constructor (Entity_Id, Node_Id, tree); | |
240 | static tree extract_values (tree, tree); | |
241 | static tree pos_to_constructor (Node_Id, tree, Entity_Id); | |
f04b8d69 | 242 | static void validate_unchecked_conversion (Node_Id); |
a1ab4c31 | 243 | static tree maybe_implicit_deref (tree); |
ba464315 | 244 | static void set_expr_location_from_node (tree, Node_Id, bool = false); |
17c168fe | 245 | static void set_gnu_expr_location_from_node (tree, Node_Id); |
ba464315 | 246 | static bool set_end_locus_from_node (tree, Node_Id); |
cb3d597d | 247 | static int lvalue_required_p (Node_Id, tree, bool, bool, bool); |
c1fd8753 | 248 | static tree build_raise_check (int, enum exception_info_kind); |
6162cec0 | 249 | static tree create_init_temporary (const char *, tree, tree *, Node_Id); |
a1ab4c31 AC |
250 | |
251 | /* Hooks for debug info back-ends, only supported and used in a restricted set | |
252 | of configurations. */ | |
253 | static const char *extract_encoding (const char *) ATTRIBUTE_UNUSED; | |
254 | static const char *decode_name (const char *) ATTRIBUTE_UNUSED; | |
255 | \f | |
256 | /* This is the main program of the back-end. It sets up all the table | |
257 | structures and then generates code. */ | |
258 | ||
259 | void | |
4bcf6815 AC |
260 | gigi (Node_Id gnat_root, |
261 | int max_gnat_node, | |
262 | int number_name ATTRIBUTE_UNUSED, | |
263 | struct Node *nodes_ptr, | |
264 | struct Flags *flags_ptr, | |
265 | Node_Id *next_node_ptr, | |
266 | Node_Id *prev_node_ptr, | |
267 | struct Elist_Header *elists_ptr, | |
268 | struct Elmt_Item *elmts_ptr, | |
269 | struct String_Entry *strings_ptr, | |
270 | Char_Code *string_chars_ptr, | |
271 | struct List_Header *list_headers_ptr, | |
272 | Nat number_file, | |
6936c61a | 273 | struct File_Info_Type *file_info_ptr, |
4bcf6815 AC |
274 | Entity_Id standard_boolean, |
275 | Entity_Id standard_integer, | |
276 | Entity_Id standard_character, | |
277 | Entity_Id standard_long_long_float, | |
278 | Entity_Id standard_exception_type, | |
279 | Int gigi_operating_mode) | |
a1ab4c31 | 280 | { |
f04b8d69 | 281 | Node_Id gnat_iter; |
01ddebf2 | 282 | Entity_Id gnat_literal; |
1eb58520 | 283 | tree t, ftype, int64_type; |
a1ab4c31 AC |
284 | struct elab_info *info; |
285 | int i; | |
286 | ||
287 | max_gnat_nodes = max_gnat_node; | |
831f44c6 | 288 | |
a1ab4c31 | 289 | Nodes_Ptr = nodes_ptr; |
4bcf6815 | 290 | Flags_Ptr = flags_ptr; |
a1ab4c31 AC |
291 | Next_Node_Ptr = next_node_ptr; |
292 | Prev_Node_Ptr = prev_node_ptr; | |
293 | Elists_Ptr = elists_ptr; | |
294 | Elmts_Ptr = elmts_ptr; | |
295 | Strings_Ptr = strings_ptr; | |
296 | String_Chars_Ptr = string_chars_ptr; | |
297 | List_Headers_Ptr = list_headers_ptr; | |
298 | ||
299 | type_annotate_only = (gigi_operating_mode == 1); | |
300 | ||
831f44c6 | 301 | for (i = 0; i < number_file; i++) |
a1ab4c31 AC |
302 | { |
303 | /* Use the identifier table to make a permanent copy of the filename as | |
304 | the name table gets reallocated after Gigi returns but before all the | |
305 | debugging information is output. The __gnat_to_canonical_file_spec | |
306 | call translates filenames from pragmas Source_Reference that contain | |
1e17ef87 | 307 | host style syntax not understood by gdb. */ |
a1ab4c31 AC |
308 | const char *filename |
309 | = IDENTIFIER_POINTER | |
310 | (get_identifier | |
311 | (__gnat_to_canonical_file_spec | |
312 | (Get_Name_String (file_info_ptr[i].File_Name)))); | |
313 | ||
314 | /* We rely on the order isomorphism between files and line maps. */ | |
46427374 | 315 | gcc_assert ((int) LINEMAPS_ORDINARY_USED (line_table) == i); |
a1ab4c31 AC |
316 | |
317 | /* We create the line map for a source file at once, with a fixed number | |
318 | of columns chosen to avoid jumping over the next power of 2. */ | |
fd96b9fc | 319 | linemap_add (line_table, LC_ENTER, 0, filename, 1); |
a1ab4c31 AC |
320 | linemap_line_start (line_table, file_info_ptr[i].Num_Source_Lines, 252); |
321 | linemap_position_for_column (line_table, 252 - 1); | |
322 | linemap_add (line_table, LC_LEAVE, 0, NULL, 0); | |
323 | } | |
324 | ||
52e04e56 EB |
325 | gcc_assert (Nkind (gnat_root) == N_Compilation_Unit); |
326 | ||
327 | /* Declare the name of the compilation unit as the first global | |
328 | name in order to make the middle-end fully deterministic. */ | |
329 | t = create_concat_name (Defining_Entity (Unit (gnat_root)), NULL); | |
330 | first_global_object_name = ggc_strdup (IDENTIFIER_POINTER (t)); | |
331 | ||
a1ab4c31 AC |
332 | /* Initialize ourselves. */ |
333 | init_code_table (); | |
4116e7d0 | 334 | init_gnat_decl (); |
842d4ee2 | 335 | init_gnat_utils (); |
a1ab4c31 AC |
336 | |
337 | /* If we are just annotating types, give VOID_TYPE zero sizes to avoid | |
338 | errors. */ | |
339 | if (type_annotate_only) | |
340 | { | |
341 | TYPE_SIZE (void_type_node) = bitsize_zero_node; | |
342 | TYPE_SIZE_UNIT (void_type_node) = size_zero_node; | |
343 | } | |
344 | ||
a1ab4c31 AC |
345 | /* Enable GNAT stack checking method if needed */ |
346 | if (!Stack_Check_Probes_On_Target) | |
d477d1fe | 347 | set_stack_check_libfunc ("_gnat_stack_check"); |
a1ab4c31 | 348 | |
caa9d12a EB |
349 | /* Retrieve alignment settings. */ |
350 | double_float_alignment = get_target_double_float_alignment (); | |
351 | double_scalar_alignment = get_target_double_scalar_alignment (); | |
352 | ||
6936c61a EB |
353 | /* Record the builtin types. Define `integer' and `character' first so that |
354 | dbx will output them first. */ | |
1aeb40dd | 355 | record_builtin_type ("integer", integer_type_node, false); |
825da0d2 | 356 | record_builtin_type ("character", char_type_node, false); |
1aeb40dd EB |
357 | record_builtin_type ("boolean", boolean_type_node, false); |
358 | record_builtin_type ("void", void_type_node, false); | |
10069d53 EB |
359 | |
360 | /* Save the type we made for integer as the type for Standard.Integer. */ | |
6936c61a EB |
361 | save_gnu_tree (Base_Type (standard_integer), |
362 | TYPE_NAME (integer_type_node), | |
10069d53 | 363 | false); |
a1ab4c31 | 364 | |
6936c61a | 365 | /* Likewise for character as the type for Standard.Character. */ |
825da0d2 | 366 | finish_character_type (char_type_node); |
6936c61a | 367 | save_gnu_tree (Base_Type (standard_character), |
825da0d2 | 368 | TYPE_NAME (char_type_node), |
6936c61a EB |
369 | false); |
370 | ||
371 | /* Likewise for boolean as the type for Standard.Boolean. */ | |
372 | save_gnu_tree (Base_Type (standard_boolean), | |
373 | TYPE_NAME (boolean_type_node), | |
01ddebf2 EB |
374 | false); |
375 | gnat_literal = First_Literal (Base_Type (standard_boolean)); | |
376 | t = UI_To_gnu (Enumeration_Rep (gnat_literal), boolean_type_node); | |
377 | gcc_assert (t == boolean_false_node); | |
378 | t = create_var_decl (get_entity_name (gnat_literal), NULL_TREE, | |
2056c5ed | 379 | boolean_type_node, t, true, false, false, false, false, |
c1a569ef | 380 | true, false, NULL, gnat_literal); |
01ddebf2 EB |
381 | save_gnu_tree (gnat_literal, t, false); |
382 | gnat_literal = Next_Literal (gnat_literal); | |
383 | t = UI_To_gnu (Enumeration_Rep (gnat_literal), boolean_type_node); | |
384 | gcc_assert (t == boolean_true_node); | |
385 | t = create_var_decl (get_entity_name (gnat_literal), NULL_TREE, | |
2056c5ed | 386 | boolean_type_node, t, true, false, false, false, false, |
c1a569ef | 387 | true, false, NULL, gnat_literal); |
01ddebf2 EB |
388 | save_gnu_tree (gnat_literal, t, false); |
389 | ||
9182f718 EB |
390 | /* Declare the building blocks of function nodes. */ |
391 | void_list_node = build_tree_list (NULL_TREE, void_type_node); | |
c1fd8753 | 392 | void_ftype = build_function_type_list (void_type_node, NULL_TREE); |
10069d53 EB |
393 | ptr_void_ftype = build_pointer_type (void_ftype); |
394 | ||
c01fe451 | 395 | /* Now declare run-time functions. */ |
1366ba41 | 396 | ftype = build_function_type_list (ptr_type_node, sizetype, NULL_TREE); |
10069d53 EB |
397 | malloc_decl |
398 | = create_subprog_decl (get_identifier ("__gnat_malloc"), NULL_TREE, | |
c1a569ef | 399 | ftype, |
1e55d29a EB |
400 | NULL_TREE, is_disabled, true, true, true, false, |
401 | NULL, Empty); | |
10069d53 EB |
402 | DECL_IS_MALLOC (malloc_decl) = 1; |
403 | ||
9182f718 | 404 | ftype = build_function_type_list (void_type_node, ptr_type_node, NULL_TREE); |
10069d53 EB |
405 | free_decl |
406 | = create_subprog_decl (get_identifier ("__gnat_free"), NULL_TREE, | |
9182f718 EB |
407 | ftype, |
408 | NULL_TREE, is_disabled, true, true, true, false, | |
409 | NULL, Empty); | |
410 | ||
411 | ftype = build_function_type_list (ptr_type_node, ptr_type_node, sizetype, | |
412 | NULL_TREE); | |
413 | realloc_decl | |
414 | = create_subprog_decl (get_identifier ("__gnat_realloc"), NULL_TREE, | |
415 | ftype, | |
1e55d29a EB |
416 | NULL_TREE, is_disabled, true, true, true, false, |
417 | NULL, Empty); | |
10069d53 EB |
418 | |
419 | /* This is used for 64-bit multiplication with overflow checking. */ | |
1eb58520 | 420 | int64_type = gnat_type_for_size (64, 0); |
10069d53 EB |
421 | mulv64_decl |
422 | = create_subprog_decl (get_identifier ("__gnat_mulv64"), NULL_TREE, | |
423 | build_function_type_list (int64_type, int64_type, | |
424 | int64_type, NULL_TREE), | |
1e55d29a EB |
425 | NULL_TREE, is_disabled, true, true, true, false, |
426 | NULL, Empty); | |
10069d53 | 427 | |
76af763d EB |
428 | /* Name of the _Parent field in tagged record types. */ |
429 | parent_name_id = get_identifier (Get_Name_String (Name_uParent)); | |
430 | ||
871fda0a EB |
431 | /* Name of the Exception_Data type defined in System.Standard_Library. */ |
432 | exception_data_name_id | |
433 | = get_identifier ("system__standard_library__exception_data"); | |
434 | ||
10069d53 | 435 | /* Make the types and functions used for exception processing. */ |
64235766 EB |
436 | except_type_node = gnat_to_gnu_type (Base_Type (standard_exception_type)); |
437 | ||
10069d53 EB |
438 | jmpbuf_type |
439 | = build_array_type (gnat_type_for_mode (Pmode, 0), | |
26383c64 | 440 | build_index_type (size_int (5))); |
1aeb40dd | 441 | record_builtin_type ("JMPBUF_T", jmpbuf_type, true); |
10069d53 EB |
442 | jmpbuf_ptr_type = build_pointer_type (jmpbuf_type); |
443 | ||
444 | /* Functions to get and set the jumpbuf pointer for the current thread. */ | |
445 | get_jmpbuf_decl | |
446 | = create_subprog_decl | |
c1fd8753 NF |
447 | (get_identifier ("system__soft_links__get_jmpbuf_address_soft"), |
448 | NULL_TREE, build_function_type_list (jmpbuf_ptr_type, NULL_TREE), | |
1e55d29a | 449 | NULL_TREE, is_disabled, true, true, true, false, NULL, Empty); |
10069d53 EB |
450 | |
451 | set_jmpbuf_decl | |
452 | = create_subprog_decl | |
c1fd8753 NF |
453 | (get_identifier ("system__soft_links__set_jmpbuf_address_soft"), |
454 | NULL_TREE, build_function_type_list (void_type_node, jmpbuf_ptr_type, | |
455 | NULL_TREE), | |
1e55d29a | 456 | NULL_TREE, is_disabled, true, true, true, false, NULL, Empty); |
10069d53 | 457 | |
64235766 EB |
458 | get_excptr_decl |
459 | = create_subprog_decl | |
460 | (get_identifier ("system__soft_links__get_gnat_exception"), NULL_TREE, | |
461 | build_function_type_list (build_pointer_type (except_type_node), | |
462 | NULL_TREE), | |
1e55d29a | 463 | NULL_TREE, is_disabled, true, true, true, false, NULL, Empty); |
64235766 EB |
464 | |
465 | not_handled_by_others_decl = get_identifier ("not_handled_by_others"); | |
466 | for (t = TYPE_FIELDS (except_type_node); t; t = DECL_CHAIN (t)) | |
467 | if (DECL_NAME (t) == not_handled_by_others_decl) | |
468 | { | |
469 | not_handled_by_others_decl = t; | |
470 | break; | |
471 | } | |
472 | gcc_assert (DECL_P (not_handled_by_others_decl)); | |
473 | ||
10069d53 EB |
474 | /* setjmp returns an integer and has one operand, which is a pointer to |
475 | a jmpbuf. */ | |
476 | setjmp_decl | |
477 | = create_subprog_decl | |
478 | (get_identifier ("__builtin_setjmp"), NULL_TREE, | |
c1fd8753 NF |
479 | build_function_type_list (integer_type_node, jmpbuf_ptr_type, |
480 | NULL_TREE), | |
1e55d29a | 481 | NULL_TREE, is_disabled, true, true, true, false, NULL, Empty); |
10069d53 EB |
482 | DECL_BUILT_IN_CLASS (setjmp_decl) = BUILT_IN_NORMAL; |
483 | DECL_FUNCTION_CODE (setjmp_decl) = BUILT_IN_SETJMP; | |
484 | ||
485 | /* update_setjmp_buf updates a setjmp buffer from the current stack pointer | |
486 | address. */ | |
487 | update_setjmp_buf_decl | |
488 | = create_subprog_decl | |
489 | (get_identifier ("__builtin_update_setjmp_buf"), NULL_TREE, | |
c1fd8753 | 490 | build_function_type_list (void_type_node, jmpbuf_ptr_type, NULL_TREE), |
1e55d29a | 491 | NULL_TREE, is_disabled, true, true, true, false, NULL, Empty); |
10069d53 EB |
492 | DECL_BUILT_IN_CLASS (update_setjmp_buf_decl) = BUILT_IN_NORMAL; |
493 | DECL_FUNCTION_CODE (update_setjmp_buf_decl) = BUILT_IN_UPDATE_SETJMP_BUF; | |
494 | ||
2056c5ed | 495 | /* Indicate that it never returns. */ |
1e55d29a EB |
496 | ftype = build_function_type_list (void_type_node, |
497 | build_pointer_type (except_type_node), | |
498 | NULL_TREE); | |
499 | ftype = build_qualified_type (ftype, TYPE_QUAL_VOLATILE); | |
64235766 EB |
500 | raise_nodefer_decl |
501 | = create_subprog_decl | |
1e55d29a EB |
502 | (get_identifier ("__gnat_raise_nodefer_with_msg"), NULL_TREE, ftype, |
503 | NULL_TREE, is_disabled, true, true, true, false, NULL, Empty); | |
64235766 EB |
504 | |
505 | set_exception_parameter_decl | |
506 | = create_subprog_decl | |
507 | (get_identifier ("__gnat_set_exception_parameter"), NULL_TREE, | |
508 | build_function_type_list (void_type_node, ptr_type_node, ptr_type_node, | |
509 | NULL_TREE), | |
1e55d29a | 510 | NULL_TREE, is_disabled, true, true, true, false, NULL, Empty); |
64235766 | 511 | |
10069d53 | 512 | /* Hooks to call when entering/leaving an exception handler. */ |
1366ba41 | 513 | ftype = build_function_type_list (void_type_node, ptr_type_node, NULL_TREE); |
c1fd8753 | 514 | |
10069d53 EB |
515 | begin_handler_decl |
516 | = create_subprog_decl (get_identifier ("__gnat_begin_handler"), NULL_TREE, | |
c1a569ef | 517 | ftype, NULL_TREE, |
1e55d29a | 518 | is_disabled, true, true, true, false, NULL, Empty); |
10069d53 EB |
519 | |
520 | end_handler_decl | |
521 | = create_subprog_decl (get_identifier ("__gnat_end_handler"), NULL_TREE, | |
c1a569ef | 522 | ftype, NULL_TREE, |
1e55d29a | 523 | is_disabled, true, true, true, false, NULL, Empty); |
10069d53 | 524 | |
48a24fcf TG |
525 | unhandled_except_decl |
526 | = create_subprog_decl (get_identifier ("__gnat_unhandled_except_handler"), | |
c1a569ef | 527 | NULL_TREE, ftype, NULL_TREE, |
1e55d29a EB |
528 | is_disabled, true, true, true, false, NULL, Empty); |
529 | ||
530 | /* Indicate that it never returns. */ | |
531 | ftype = build_qualified_type (ftype, TYPE_QUAL_VOLATILE); | |
532 | reraise_zcx_decl | |
533 | = create_subprog_decl (get_identifier ("__gnat_reraise_zcx"), NULL_TREE, | |
534 | ftype, NULL_TREE, | |
535 | is_disabled, true, true, true, false, NULL, Empty); | |
48a24fcf | 536 | |
64235766 EB |
537 | /* Dummy objects to materialize "others" and "all others" in the exception |
538 | tables. These are exported by a-exexpr-gcc.adb, so see this unit for | |
539 | the types to use. */ | |
540 | others_decl | |
541 | = create_var_decl (get_identifier ("OTHERS"), | |
542 | get_identifier ("__gnat_others_value"), | |
825da0d2 | 543 | char_type_node, NULL_TREE, |
2056c5ed | 544 | true, false, true, false, false, true, false, |
64235766 EB |
545 | NULL, Empty); |
546 | ||
547 | all_others_decl | |
548 | = create_var_decl (get_identifier ("ALL_OTHERS"), | |
549 | get_identifier ("__gnat_all_others_value"), | |
825da0d2 | 550 | char_type_node, NULL_TREE, |
2056c5ed | 551 | true, false, true, false, false, true, false, |
64235766 EB |
552 | NULL, Empty); |
553 | ||
554 | unhandled_others_decl | |
555 | = create_var_decl (get_identifier ("UNHANDLED_OTHERS"), | |
556 | get_identifier ("__gnat_unhandled_others_value"), | |
825da0d2 | 557 | char_type_node, NULL_TREE, |
2056c5ed | 558 | true, false, true, false, false, true, false, |
64235766 | 559 | NULL, Empty); |
624e1688 | 560 | |
10069d53 EB |
561 | /* If in no exception handlers mode, all raise statements are redirected to |
562 | __gnat_last_chance_handler. No need to redefine raise_nodefer_decl since | |
563 | this procedure will never be called in this mode. */ | |
564 | if (No_Exception_Handlers_Set ()) | |
565 | { | |
1e55d29a EB |
566 | /* Indicate that it never returns. */ |
567 | ftype = build_function_type_list (void_type_node, | |
568 | build_pointer_type (char_type_node), | |
569 | integer_type_node, NULL_TREE); | |
570 | ftype = build_qualified_type (ftype, TYPE_QUAL_VOLATILE); | |
10069d53 EB |
571 | tree decl |
572 | = create_subprog_decl | |
1e55d29a EB |
573 | (get_identifier ("__gnat_last_chance_handler"), NULL_TREE, ftype, |
574 | NULL_TREE, is_disabled, true, true, true, false, NULL, Empty); | |
cfc839a4 EB |
575 | for (i = 0; i < (int) ARRAY_SIZE (gnat_raise_decls); i++) |
576 | gnat_raise_decls[i] = decl; | |
10069d53 EB |
577 | } |
578 | else | |
10069d53 | 579 | { |
437f8c1e AC |
580 | /* Otherwise, make one decl for each exception reason. */ |
581 | for (i = 0; i < (int) ARRAY_SIZE (gnat_raise_decls); i++) | |
c1fd8753 | 582 | gnat_raise_decls[i] = build_raise_check (i, exception_simple); |
437f8c1e AC |
583 | for (i = 0; i < (int) ARRAY_SIZE (gnat_raise_decls_ext); i++) |
584 | gnat_raise_decls_ext[i] | |
c1fd8753 | 585 | = build_raise_check (i, |
437f8c1e | 586 | i == CE_Index_Check_Failed |
ea034236 AC |
587 | || i == CE_Range_Check_Failed |
588 | || i == CE_Invalid_Data | |
589 | ? exception_range : exception_column); | |
10069d53 EB |
590 | } |
591 | ||
10069d53 EB |
592 | /* Build the special descriptor type and its null node if needed. */ |
593 | if (TARGET_VTABLE_USES_DESCRIPTORS) | |
594 | { | |
595 | tree null_node = fold_convert (ptr_void_ftype, null_pointer_node); | |
0e228dd9 | 596 | tree field_list = NULL_TREE; |
10069d53 | 597 | int j; |
9771b263 | 598 | vec<constructor_elt, va_gc> *null_vec = NULL; |
0e228dd9 | 599 | constructor_elt *elt; |
10069d53 EB |
600 | |
601 | fdesc_type_node = make_node (RECORD_TYPE); | |
9771b263 DN |
602 | vec_safe_grow (null_vec, TARGET_VTABLE_USES_DESCRIPTORS); |
603 | elt = (null_vec->address () + TARGET_VTABLE_USES_DESCRIPTORS - 1); | |
10069d53 EB |
604 | |
605 | for (j = 0; j < TARGET_VTABLE_USES_DESCRIPTORS; j++) | |
606 | { | |
da01bfee EB |
607 | tree field |
608 | = create_field_decl (NULL_TREE, ptr_void_ftype, fdesc_type_node, | |
609 | NULL_TREE, NULL_TREE, 0, 1); | |
7d76717d | 610 | DECL_CHAIN (field) = field_list; |
10069d53 | 611 | field_list = field; |
0e228dd9 NF |
612 | elt->index = field; |
613 | elt->value = null_node; | |
614 | elt--; | |
10069d53 EB |
615 | } |
616 | ||
032d1b71 | 617 | finish_record_type (fdesc_type_node, nreverse (field_list), 0, false); |
1aeb40dd | 618 | record_builtin_type ("descriptor", fdesc_type_node, true); |
0e228dd9 | 619 | null_fdesc_node = gnat_build_constructor (fdesc_type_node, null_vec); |
10069d53 EB |
620 | } |
621 | ||
1eb58520 AC |
622 | longest_float_type_node |
623 | = get_unpadded_type (Base_Type (standard_long_long_float)); | |
f7ebc6a8 | 624 | |
10069d53 EB |
625 | main_identifier_node = get_identifier ("main"); |
626 | ||
c8a23c29 EB |
627 | /* If we are using the GCC exception mechanism, let GCC know. */ |
628 | if (Back_End_Exceptions ()) | |
629 | gnat_init_gcc_eh (); | |
630 | ||
631 | /* Initialize the GCC support for FP operations. */ | |
632 | gnat_init_gcc_fp (); | |
633 | ||
634 | /* Install the builtins we might need, either internally or as user-available | |
635 | facilities for Intrinsic imports. Note that this must be done after the | |
636 | GCC exception mechanism is initialized. */ | |
10069d53 | 637 | gnat_install_builtins (); |
a1ab4c31 | 638 | |
9771b263 DN |
639 | vec_safe_push (gnu_except_ptr_stack, NULL_TREE); |
640 | vec_safe_push (gnu_constraint_error_label_stack, NULL_TREE); | |
641 | vec_safe_push (gnu_storage_error_label_stack, NULL_TREE); | |
642 | vec_safe_push (gnu_program_error_label_stack, NULL_TREE); | |
a1ab4c31 | 643 | |
a1ab4c31 | 644 | /* Process any Pragma Ident for the main unit. */ |
a1ab4c31 | 645 | if (Present (Ident_String (Main_Unit))) |
a8781821 SB |
646 | targetm.asm_out.output_ident |
647 | (TREE_STRING_POINTER (gnat_to_gnu (Ident_String (Main_Unit)))); | |
a1ab4c31 | 648 | |
c3831524 AC |
649 | /* Force -fno-strict-aliasing if the configuration pragma was seen. */ |
650 | if (No_Strict_Aliasing_CP) | |
651 | flag_strict_aliasing = 0; | |
652 | ||
c0c91386 JJ |
653 | /* Save the current optimization options again after the above possible |
654 | global_options changes. */ | |
655 | optimization_default_node = build_optimization_node (&global_options); | |
656 | optimization_current_node = optimization_default_node; | |
657 | ||
6a7a3f31 | 658 | /* Now translate the compilation unit proper. */ |
a1ab4c31 AC |
659 | Compilation_Unit_to_gnu (gnat_root); |
660 | ||
87ab2b04 EB |
661 | /* Disable -Waggressive-loop-optimizations since we implement our own |
662 | version of the warning. */ | |
663 | warn_aggressive_loop_optimizations = 0; | |
664 | ||
f04b8d69 EB |
665 | /* Then process the N_Validate_Unchecked_Conversion nodes. We do this at |
666 | the very end to avoid having to second-guess the front-end when we run | |
667 | into dummy nodes during the regular processing. */ | |
9771b263 | 668 | for (i = 0; gnat_validate_uc_list.iterate (i, &gnat_iter); i++) |
f04b8d69 | 669 | validate_unchecked_conversion (gnat_iter); |
9771b263 | 670 | gnat_validate_uc_list.release (); |
f04b8d69 | 671 | |
6a7a3f31 | 672 | /* Finally see if we have any elaboration procedures to deal with. */ |
a1ab4c31 AC |
673 | for (info = elab_info_list; info; info = info->next) |
674 | { | |
102a1631 | 675 | tree gnu_body = DECL_SAVED_TREE (info->elab_proc); |
a1ab4c31 | 676 | |
2fa03086 EB |
677 | /* We should have a BIND_EXPR but it may not have any statements in it. |
678 | If it doesn't have any, we have nothing to do except for setting the | |
679 | flag on the GNAT node. Otherwise, process the function as others. */ | |
102a1631 | 680 | tree gnu_stmts = gnu_body; |
a406865a RG |
681 | if (TREE_CODE (gnu_stmts) == BIND_EXPR) |
682 | gnu_stmts = BIND_EXPR_BODY (gnu_stmts); | |
102a1631 | 683 | if (!gnu_stmts || empty_stmt_list_p (gnu_stmts)) |
2fa03086 | 684 | Set_Has_No_Elaboration_Code (info->gnat_node, 1); |
a406865a RG |
685 | else |
686 | { | |
a406865a RG |
687 | begin_subprog_body (info->elab_proc); |
688 | end_subprog_body (gnu_body); | |
71196d4e | 689 | rest_of_subprog_body_compilation (info->elab_proc); |
a406865a | 690 | } |
a1ab4c31 AC |
691 | } |
692 | ||
f04b8d69 | 693 | /* Destroy ourselves. */ |
4116e7d0 | 694 | destroy_gnat_decl (); |
842d4ee2 | 695 | destroy_gnat_utils (); |
f04b8d69 | 696 | |
a1ab4c31 AC |
697 | /* We cannot track the location of errors past this point. */ |
698 | error_gnat_node = Empty; | |
699 | } | |
700 | \f | |
437f8c1e | 701 | /* Return a subprogram decl corresponding to __gnat_rcheck_xx for the given |
c1fd8753 | 702 | CHECK if KIND is EXCEPTION_SIMPLE, or else to __gnat_rcheck_xx_ext. */ |
437f8c1e AC |
703 | |
704 | static tree | |
c1fd8753 | 705 | build_raise_check (int check, enum exception_info_kind kind) |
437f8c1e | 706 | { |
c1fd8753 | 707 | tree result, ftype; |
0c644c99 TG |
708 | const char pfx[] = "__gnat_rcheck_"; |
709 | ||
710 | strcpy (Name_Buffer, pfx); | |
711 | Name_Len = sizeof (pfx) - 1; | |
712 | Get_RT_Exception_Name (check); | |
437f8c1e | 713 | |
c1fd8753 | 714 | if (kind == exception_simple) |
437f8c1e | 715 | { |
0c644c99 | 716 | Name_Buffer[Name_Len] = 0; |
c1fd8753 NF |
717 | ftype |
718 | = build_function_type_list (void_type_node, | |
825da0d2 | 719 | build_pointer_type (char_type_node), |
c1fd8753 | 720 | integer_type_node, NULL_TREE); |
437f8c1e AC |
721 | } |
722 | else | |
723 | { | |
c1fd8753 | 724 | tree t = (kind == exception_column ? NULL_TREE : integer_type_node); |
0c644c99 TG |
725 | |
726 | strcpy (Name_Buffer + Name_Len, "_ext"); | |
727 | Name_Buffer[Name_Len + 4] = 0; | |
c1fd8753 NF |
728 | ftype |
729 | = build_function_type_list (void_type_node, | |
825da0d2 | 730 | build_pointer_type (char_type_node), |
c1fd8753 NF |
731 | integer_type_node, integer_type_node, |
732 | t, t, NULL_TREE); | |
437f8c1e | 733 | } |
cfc839a4 | 734 | |
2056c5ed | 735 | /* Indicate that it never returns. */ |
1e55d29a | 736 | ftype = build_qualified_type (ftype, TYPE_QUAL_VOLATILE); |
c1fd8753 | 737 | result |
1e55d29a EB |
738 | = create_subprog_decl (get_identifier (Name_Buffer), NULL_TREE, ftype, |
739 | NULL_TREE, is_disabled, true, true, true, false, | |
c1a569ef | 740 | NULL, Empty); |
c1fd8753 | 741 | |
437f8c1e AC |
742 | return result; |
743 | } | |
744 | \f | |
3cd64bab EB |
745 | /* Return a positive value if an lvalue is required for GNAT_NODE, which is |
746 | an N_Attribute_Reference. */ | |
747 | ||
748 | static int | |
749 | lvalue_required_for_attribute_p (Node_Id gnat_node) | |
750 | { | |
751 | switch (Get_Attribute_Id (Attribute_Name (gnat_node))) | |
752 | { | |
753 | case Attr_Pos: | |
754 | case Attr_Val: | |
755 | case Attr_Pred: | |
756 | case Attr_Succ: | |
757 | case Attr_First: | |
758 | case Attr_Last: | |
759 | case Attr_Range_Length: | |
760 | case Attr_Length: | |
761 | case Attr_Object_Size: | |
762 | case Attr_Value_Size: | |
763 | case Attr_Component_Size: | |
24228312 | 764 | case Attr_Descriptor_Size: |
3cd64bab EB |
765 | case Attr_Max_Size_In_Storage_Elements: |
766 | case Attr_Min: | |
767 | case Attr_Max: | |
768 | case Attr_Null_Parameter: | |
769 | case Attr_Passed_By_Reference: | |
770 | case Attr_Mechanism_Code: | |
24228312 AC |
771 | case Attr_Machine: |
772 | case Attr_Model: | |
3cd64bab EB |
773 | return 0; |
774 | ||
775 | case Attr_Address: | |
776 | case Attr_Access: | |
777 | case Attr_Unchecked_Access: | |
778 | case Attr_Unrestricted_Access: | |
779 | case Attr_Code_Address: | |
780 | case Attr_Pool_Address: | |
781 | case Attr_Size: | |
782 | case Attr_Alignment: | |
783 | case Attr_Bit_Position: | |
784 | case Attr_Position: | |
785 | case Attr_First_Bit: | |
786 | case Attr_Last_Bit: | |
787 | case Attr_Bit: | |
7e4680c1 EB |
788 | case Attr_Asm_Input: |
789 | case Attr_Asm_Output: | |
3cd64bab EB |
790 | default: |
791 | return 1; | |
792 | } | |
793 | } | |
794 | ||
22d12fc2 EB |
795 | /* Return a positive value if an lvalue is required for GNAT_NODE. GNU_TYPE |
796 | is the type that will be used for GNAT_NODE in the translated GNU tree. | |
797 | CONSTANT indicates whether the underlying object represented by GNAT_NODE | |
cb3d597d EB |
798 | is constant in the Ada sense. If it is, ADDRESS_OF_CONSTANT indicates |
799 | whether its value is the address of a constant and ALIASED whether it is | |
800 | aliased. If it isn't, ADDRESS_OF_CONSTANT and ALIASED are ignored. | |
22d12fc2 EB |
801 | |
802 | The function climbs up the GNAT tree starting from the node and returns 1 | |
803 | upon encountering a node that effectively requires an lvalue downstream. | |
804 | It returns int instead of bool to facilitate usage in non-purely binary | |
805 | logic contexts. */ | |
a1ab4c31 AC |
806 | |
807 | static int | |
03b6f8a2 | 808 | lvalue_required_p (Node_Id gnat_node, tree gnu_type, bool constant, |
cb3d597d | 809 | bool address_of_constant, bool aliased) |
a1ab4c31 AC |
810 | { |
811 | Node_Id gnat_parent = Parent (gnat_node), gnat_temp; | |
812 | ||
813 | switch (Nkind (gnat_parent)) | |
814 | { | |
815 | case N_Reference: | |
816 | return 1; | |
817 | ||
818 | case N_Attribute_Reference: | |
3cd64bab | 819 | return lvalue_required_for_attribute_p (gnat_parent); |
a1ab4c31 AC |
820 | |
821 | case N_Parameter_Association: | |
822 | case N_Function_Call: | |
823 | case N_Procedure_Call_Statement: | |
1fc24649 EB |
824 | /* If the parameter is by reference, an lvalue is required. */ |
825 | return (!constant | |
826 | || must_pass_by_ref (gnu_type) | |
827 | || default_pass_by_ref (gnu_type)); | |
a1ab4c31 AC |
828 | |
829 | case N_Indexed_Component: | |
830 | /* Only the array expression can require an lvalue. */ | |
831 | if (Prefix (gnat_parent) != gnat_node) | |
832 | return 0; | |
833 | ||
ed98eed8 EB |
834 | /* ??? Consider that referencing an indexed component with a variable |
835 | index forces the whole aggregate to memory. Note that testing only | |
836 | for literals is conservative, any static expression in the RM sense | |
837 | could probably be accepted with some additional work. */ | |
a1ab4c31 AC |
838 | for (gnat_temp = First (Expressions (gnat_parent)); |
839 | Present (gnat_temp); | |
840 | gnat_temp = Next (gnat_temp)) | |
ed98eed8 EB |
841 | if (Nkind (gnat_temp) != N_Character_Literal |
842 | && Nkind (gnat_temp) != N_Integer_Literal | |
843 | && !(Is_Entity_Name (gnat_temp) | |
844 | && Ekind (Entity (gnat_temp)) == E_Enumeration_Literal)) | |
a1ab4c31 AC |
845 | return 1; |
846 | ||
847 | /* ... fall through ... */ | |
848 | ||
849 | case N_Slice: | |
850 | /* Only the array expression can require an lvalue. */ | |
851 | if (Prefix (gnat_parent) != gnat_node) | |
852 | return 0; | |
853 | ||
854 | aliased |= Has_Aliased_Components (Etype (gnat_node)); | |
cb3d597d EB |
855 | return lvalue_required_p (gnat_parent, gnu_type, constant, |
856 | address_of_constant, aliased); | |
a1ab4c31 AC |
857 | |
858 | case N_Selected_Component: | |
859 | aliased |= Is_Aliased (Entity (Selector_Name (gnat_parent))); | |
cb3d597d EB |
860 | return lvalue_required_p (gnat_parent, gnu_type, constant, |
861 | address_of_constant, aliased); | |
a1ab4c31 AC |
862 | |
863 | case N_Object_Renaming_Declaration: | |
e297e2ea EB |
864 | /* We need to preserve addresses through a renaming. */ |
865 | return 1; | |
a1ab4c31 | 866 | |
bbaba73f EB |
867 | case N_Object_Declaration: |
868 | /* We cannot use a constructor if this is an atomic object because | |
869 | the actual assignment might end up being done component-wise. */ | |
1fc24649 EB |
870 | return (!constant |
871 | ||(Is_Composite_Type (Underlying_Type (Etype (gnat_node))) | |
f797c2b7 | 872 | && Is_Atomic_Or_VFA (Defining_Entity (gnat_parent))) |
cb3d597d EB |
873 | /* We don't use a constructor if this is a class-wide object |
874 | because the effective type of the object is the equivalent | |
875 | type of the class-wide subtype and it smashes most of the | |
876 | data into an array of bytes to which we cannot convert. */ | |
877 | || Ekind ((Etype (Defining_Entity (gnat_parent)))) | |
878 | == E_Class_Wide_Subtype); | |
bbaba73f EB |
879 | |
880 | case N_Assignment_Statement: | |
881 | /* We cannot use a constructor if the LHS is an atomic object because | |
882 | the actual assignment might end up being done component-wise. */ | |
1fc24649 EB |
883 | return (!constant |
884 | || Name (gnat_parent) == gnat_node | |
03b6f8a2 | 885 | || (Is_Composite_Type (Underlying_Type (Etype (gnat_node))) |
f797c2b7 EB |
886 | && Is_Entity_Name (Name (gnat_parent)) |
887 | && Is_Atomic_Or_VFA (Entity (Name (gnat_parent))))); | |
bbaba73f | 888 | |
054d6b83 EB |
889 | case N_Unchecked_Type_Conversion: |
890 | if (!constant) | |
891 | return 1; | |
76af763d EB |
892 | |
893 | /* ... fall through ... */ | |
894 | ||
054d6b83 EB |
895 | case N_Type_Conversion: |
896 | case N_Qualified_Expression: | |
897 | /* We must look through all conversions because we may need to bypass | |
898 | an intermediate conversion that is meant to be purely formal. */ | |
899 | return lvalue_required_p (gnat_parent, | |
900 | get_unpadded_type (Etype (gnat_parent)), | |
901 | constant, address_of_constant, aliased); | |
cb3d597d | 902 | |
76af763d | 903 | case N_Allocator: |
054d6b83 EB |
904 | /* We should only reach here through the N_Qualified_Expression case. |
905 | Force an lvalue for composite types since a block-copy to the newly | |
906 | allocated area of memory is made. */ | |
907 | return Is_Composite_Type (Underlying_Type (Etype (gnat_node))); | |
76af763d | 908 | |
cb3d597d EB |
909 | case N_Explicit_Dereference: |
910 | /* We look through dereferences for address of constant because we need | |
911 | to handle the special cases listed above. */ | |
912 | if (constant && address_of_constant) | |
913 | return lvalue_required_p (gnat_parent, | |
914 | get_unpadded_type (Etype (gnat_parent)), | |
915 | true, false, true); | |
916 | ||
917 | /* ... fall through ... */ | |
22d12fc2 | 918 | |
a1ab4c31 AC |
919 | default: |
920 | return 0; | |
921 | } | |
922 | ||
923 | gcc_unreachable (); | |
924 | } | |
925 | ||
e297e2ea EB |
926 | /* Return true if T is a constant DECL node that can be safely replaced |
927 | by its initializer. */ | |
928 | ||
929 | static bool | |
930 | constant_decl_with_initializer_p (tree t) | |
931 | { | |
932 | if (!TREE_CONSTANT (t) || !DECL_P (t) || !DECL_INITIAL (t)) | |
933 | return false; | |
934 | ||
935 | /* Return false for aggregate types that contain a placeholder since | |
936 | their initializers cannot be manipulated easily. */ | |
937 | if (AGGREGATE_TYPE_P (TREE_TYPE (t)) | |
938 | && !TYPE_IS_FAT_POINTER_P (TREE_TYPE (t)) | |
939 | && type_contains_placeholder_p (TREE_TYPE (t))) | |
940 | return false; | |
941 | ||
942 | return true; | |
943 | } | |
944 | ||
945 | /* Return an expression equivalent to EXP but where constant DECL nodes | |
946 | have been replaced by their initializer. */ | |
947 | ||
948 | static tree | |
949 | fold_constant_decl_in_expr (tree exp) | |
950 | { | |
951 | enum tree_code code = TREE_CODE (exp); | |
952 | tree op0; | |
953 | ||
954 | switch (code) | |
955 | { | |
956 | case CONST_DECL: | |
957 | case VAR_DECL: | |
958 | if (!constant_decl_with_initializer_p (exp)) | |
959 | return exp; | |
960 | ||
961 | return DECL_INITIAL (exp); | |
962 | ||
e297e2ea EB |
963 | case COMPONENT_REF: |
964 | op0 = fold_constant_decl_in_expr (TREE_OPERAND (exp, 0)); | |
965 | if (op0 == TREE_OPERAND (exp, 0)) | |
966 | return exp; | |
967 | ||
552cc590 EB |
968 | return fold_build3 (COMPONENT_REF, TREE_TYPE (exp), op0, |
969 | TREE_OPERAND (exp, 1), NULL_TREE); | |
970 | ||
971 | case BIT_FIELD_REF: | |
972 | op0 = fold_constant_decl_in_expr (TREE_OPERAND (exp, 0)); | |
973 | if (op0 == TREE_OPERAND (exp, 0)) | |
974 | return exp; | |
975 | ||
976 | return fold_build3 (BIT_FIELD_REF, TREE_TYPE (exp), op0, | |
977 | TREE_OPERAND (exp, 1), TREE_OPERAND (exp, 2)); | |
e297e2ea EB |
978 | |
979 | case ARRAY_REF: | |
980 | case ARRAY_RANGE_REF: | |
a239279e EB |
981 | /* If the index is not itself constant, then nothing can be folded. */ |
982 | if (!TREE_CONSTANT (TREE_OPERAND (exp, 1))) | |
983 | return exp; | |
e297e2ea EB |
984 | op0 = fold_constant_decl_in_expr (TREE_OPERAND (exp, 0)); |
985 | if (op0 == TREE_OPERAND (exp, 0)) | |
986 | return exp; | |
987 | ||
988 | return fold (build4 (code, TREE_TYPE (exp), op0, TREE_OPERAND (exp, 1), | |
552cc590 | 989 | TREE_OPERAND (exp, 2), NULL_TREE)); |
e297e2ea | 990 | |
e297e2ea EB |
991 | case REALPART_EXPR: |
992 | case IMAGPART_EXPR: | |
ea292448 | 993 | case VIEW_CONVERT_EXPR: |
e297e2ea EB |
994 | op0 = fold_constant_decl_in_expr (TREE_OPERAND (exp, 0)); |
995 | if (op0 == TREE_OPERAND (exp, 0)) | |
996 | return exp; | |
997 | ||
998 | return fold_build1 (code, TREE_TYPE (exp), op0); | |
999 | ||
1000 | default: | |
1001 | return exp; | |
1002 | } | |
1003 | ||
1004 | gcc_unreachable (); | |
1005 | } | |
1006 | ||
a1ab4c31 AC |
1007 | /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Identifier, |
1008 | to a GCC tree, which is returned. GNU_RESULT_TYPE_P is a pointer | |
1009 | to where we should place the result type. */ | |
1010 | ||
1011 | static tree | |
1012 | Identifier_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p) | |
1013 | { | |
1014 | Node_Id gnat_temp, gnat_temp_type; | |
1015 | tree gnu_result, gnu_result_type; | |
1016 | ||
1017 | /* Whether we should require an lvalue for GNAT_NODE. Needed in | |
1018 | specific circumstances only, so evaluated lazily. < 0 means | |
1019 | unknown, > 0 means known true, 0 means known false. */ | |
1020 | int require_lvalue = -1; | |
1021 | ||
1022 | /* If GNAT_NODE is a constant, whether we should use the initialization | |
1023 | value instead of the constant entity, typically for scalars with an | |
1024 | address clause when the parent doesn't require an lvalue. */ | |
1025 | bool use_constant_initializer = false; | |
1026 | ||
1e55d29a EB |
1027 | /* If the Etype of this node is not the same as that of the Entity, then |
1028 | something went wrong, probably in generic instantiation. However, this | |
1029 | does not apply to types. Since we sometime have strange Ekind's, just | |
1030 | do this test for objects. Moreover, if the Etype of the Entity is private | |
1031 | or incomplete coming from a limited context, the Etype of the N_Identifier | |
1032 | is allowed to be the full/non-limited view and we also consider a packed | |
1033 | array type to be the same as the original type. Similarly, a CW type is | |
1034 | equivalent to a subtype of itself. Finally, if the types are Itypes, one | |
1035 | may be a copy of the other, which is also legal. */ | |
1d4b96e0 AC |
1036 | gnat_temp = ((Nkind (gnat_node) == N_Defining_Identifier |
1037 | || Nkind (gnat_node) == N_Defining_Operator_Symbol) | |
a1ab4c31 AC |
1038 | ? gnat_node : Entity (gnat_node)); |
1039 | gnat_temp_type = Etype (gnat_temp); | |
1040 | ||
1041 | gcc_assert (Etype (gnat_node) == gnat_temp_type | |
1042 | || (Is_Packed (gnat_temp_type) | |
1a4cb227 AC |
1043 | && (Etype (gnat_node) |
1044 | == Packed_Array_Impl_Type (gnat_temp_type))) | |
a1ab4c31 AC |
1045 | || (Is_Class_Wide_Type (Etype (gnat_node))) |
1046 | || (IN (Ekind (gnat_temp_type), Private_Kind) | |
1047 | && Present (Full_View (gnat_temp_type)) | |
1048 | && ((Etype (gnat_node) == Full_View (gnat_temp_type)) | |
1049 | || (Is_Packed (Full_View (gnat_temp_type)) | |
1050 | && (Etype (gnat_node) | |
1a4cb227 AC |
1051 | == Packed_Array_Impl_Type |
1052 | (Full_View (gnat_temp_type)))))) | |
1e55d29a EB |
1053 | || (IN (Ekind (gnat_temp_type), Incomplete_Kind) |
1054 | && From_Limited_With (gnat_temp_type) | |
1055 | && Present (Non_Limited_View (gnat_temp_type)) | |
1056 | && Etype (gnat_node) == Non_Limited_View (gnat_temp_type)) | |
a1ab4c31 AC |
1057 | || (Is_Itype (Etype (gnat_node)) && Is_Itype (gnat_temp_type)) |
1058 | || !(Ekind (gnat_temp) == E_Variable | |
1059 | || Ekind (gnat_temp) == E_Component | |
1060 | || Ekind (gnat_temp) == E_Constant | |
1061 | || Ekind (gnat_temp) == E_Loop_Parameter | |
1062 | || IN (Ekind (gnat_temp), Formal_Kind))); | |
1063 | ||
1064 | /* If this is a reference to a deferred constant whose partial view is an | |
1065 | unconstrained private type, the proper type is on the full view of the | |
1066 | constant, not on the full view of the type, which may be unconstrained. | |
1067 | ||
1068 | This may be a reference to a type, for example in the prefix of the | |
1069 | attribute Position, generated for dispatching code (see Make_DT in | |
1070 | exp_disp,adb). In that case we need the type itself, not is parent, | |
1071 | in particular if it is a derived type */ | |
e9f57686 EB |
1072 | if (Ekind (gnat_temp) == E_Constant |
1073 | && Is_Private_Type (gnat_temp_type) | |
1074 | && (Has_Unknown_Discriminants (gnat_temp_type) | |
1075 | || (Present (Full_View (gnat_temp_type)) | |
1076 | && Has_Discriminants (Full_View (gnat_temp_type)))) | |
a1ab4c31 AC |
1077 | && Present (Full_View (gnat_temp))) |
1078 | { | |
1079 | gnat_temp = Full_View (gnat_temp); | |
1080 | gnat_temp_type = Etype (gnat_temp); | |
1081 | } | |
1082 | else | |
1083 | { | |
1084 | /* We want to use the Actual_Subtype if it has already been elaborated, | |
1085 | otherwise the Etype. Avoid using Actual_Subtype for packed arrays to | |
1086 | simplify things. */ | |
1087 | if ((Ekind (gnat_temp) == E_Constant | |
1088 | || Ekind (gnat_temp) == E_Variable || Is_Formal (gnat_temp)) | |
1089 | && !(Is_Array_Type (Etype (gnat_temp)) | |
1a4cb227 | 1090 | && Present (Packed_Array_Impl_Type (Etype (gnat_temp)))) |
a1ab4c31 AC |
1091 | && Present (Actual_Subtype (gnat_temp)) |
1092 | && present_gnu_tree (Actual_Subtype (gnat_temp))) | |
1093 | gnat_temp_type = Actual_Subtype (gnat_temp); | |
1094 | else | |
1095 | gnat_temp_type = Etype (gnat_node); | |
1096 | } | |
1097 | ||
1098 | /* Expand the type of this identifier first, in case it is an enumeral | |
1099 | literal, which only get made when the type is expanded. There is no | |
1100 | order-of-elaboration issue here. */ | |
1101 | gnu_result_type = get_unpadded_type (gnat_temp_type); | |
1102 | ||
e4270465 | 1103 | /* If this is a non-imported elementary constant with an address clause, |
a1ab4c31 AC |
1104 | retrieve the value instead of a pointer to be dereferenced unless |
1105 | an lvalue is required. This is generally more efficient and actually | |
1106 | required if this is a static expression because it might be used | |
1107 | in a context where a dereference is inappropriate, such as a case | |
1108 | statement alternative or a record discriminant. There is no possible | |
308e6f3a | 1109 | volatile-ness short-circuit here since Volatile constants must be |
1e17ef87 | 1110 | imported per C.6. */ |
cb3d597d | 1111 | if (Ekind (gnat_temp) == E_Constant |
e4270465 | 1112 | && Is_Elementary_Type (gnat_temp_type) |
a1ab4c31 AC |
1113 | && !Is_Imported (gnat_temp) |
1114 | && Present (Address_Clause (gnat_temp))) | |
1115 | { | |
03b6f8a2 | 1116 | require_lvalue = lvalue_required_p (gnat_node, gnu_result_type, true, |
cb3d597d | 1117 | false, Is_Aliased (gnat_temp)); |
a1ab4c31 AC |
1118 | use_constant_initializer = !require_lvalue; |
1119 | } | |
1120 | ||
1121 | if (use_constant_initializer) | |
1122 | { | |
1123 | /* If this is a deferred constant, the initializer is attached to | |
1124 | the full view. */ | |
1125 | if (Present (Full_View (gnat_temp))) | |
1126 | gnat_temp = Full_View (gnat_temp); | |
1127 | ||
1128 | gnu_result = gnat_to_gnu (Expression (Declaration_Node (gnat_temp))); | |
1129 | } | |
1130 | else | |
afc737f0 | 1131 | gnu_result = gnat_to_gnu_entity (gnat_temp, NULL_TREE, false); |
a1ab4c31 | 1132 | |
a1ab4c31 AC |
1133 | /* Some objects (such as parameters passed by reference, globals of |
1134 | variable size, and renamed objects) actually represent the address | |
1135 | of the object. In that case, we must do the dereference. Likewise, | |
1136 | deal with parameters to foreign convention subprograms. */ | |
1137 | if (DECL_P (gnu_result) | |
1138 | && (DECL_BY_REF_P (gnu_result) | |
1139 | || (TREE_CODE (gnu_result) == PARM_DECL | |
1140 | && DECL_BY_COMPONENT_PTR_P (gnu_result)))) | |
1141 | { | |
ced57283 | 1142 | const bool read_only = DECL_POINTS_TO_READONLY_P (gnu_result); |
a1ab4c31 | 1143 | |
ad1d36ba | 1144 | /* If it's a PARM_DECL to foreign convention subprogram, convert it. */ |
a1ab4c31 AC |
1145 | if (TREE_CODE (gnu_result) == PARM_DECL |
1146 | && DECL_BY_COMPONENT_PTR_P (gnu_result)) | |
ad1d36ba EB |
1147 | gnu_result |
1148 | = convert (build_pointer_type (gnu_result_type), gnu_result); | |
1149 | ||
1150 | /* If it's a CONST_DECL, return the underlying constant like below. */ | |
e4270465 EB |
1151 | else if (TREE_CODE (gnu_result) == CONST_DECL |
1152 | && !(DECL_CONST_ADDRESS_P (gnu_result) | |
1153 | && lvalue_required_p (gnat_node, gnu_result_type, true, | |
1154 | true, false))) | |
ad1d36ba | 1155 | gnu_result = DECL_INITIAL (gnu_result); |
a1ab4c31 | 1156 | |
241125b2 | 1157 | /* If it's a renaming pointer, get to the renamed object. */ |
ad1d36ba | 1158 | if (TREE_CODE (gnu_result) == VAR_DECL |
15bf7d19 | 1159 | && !DECL_LOOP_PARM_P (gnu_result) |
241125b2 | 1160 | && DECL_RENAMED_OBJECT (gnu_result)) |
ad1d36ba | 1161 | gnu_result = DECL_RENAMED_OBJECT (gnu_result); |
a1ab4c31 | 1162 | |
ad1d36ba | 1163 | /* Otherwise, do the final dereference. */ |
a1ab4c31 | 1164 | else |
a61c3633 EB |
1165 | { |
1166 | gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result); | |
ad1d36ba EB |
1167 | |
1168 | if ((TREE_CODE (gnu_result) == INDIRECT_REF | |
1169 | || TREE_CODE (gnu_result) == UNCONSTRAINED_ARRAY_REF) | |
96769d32 | 1170 | && No (Address_Clause (gnat_temp))) |
a61c3633 | 1171 | TREE_THIS_NOTRAP (gnu_result) = 1; |
a1ab4c31 | 1172 | |
ad1d36ba EB |
1173 | if (read_only) |
1174 | TREE_READONLY (gnu_result) = 1; | |
1175 | } | |
a1ab4c31 AC |
1176 | } |
1177 | ||
58c8f770 EB |
1178 | /* If we have a constant declaration and its initializer, try to return the |
1179 | latter to avoid the need to call fold in lots of places and the need for | |
e297e2ea EB |
1180 | elaboration code if this identifier is used as an initializer itself. */ |
1181 | if (constant_decl_with_initializer_p (gnu_result)) | |
a1ab4c31 | 1182 | { |
c34f3839 EB |
1183 | bool constant_only = (TREE_CODE (gnu_result) == CONST_DECL |
1184 | && !DECL_CONST_CORRESPONDING_VAR (gnu_result)); | |
cb3d597d EB |
1185 | bool address_of_constant = (TREE_CODE (gnu_result) == CONST_DECL |
1186 | && DECL_CONST_ADDRESS_P (gnu_result)); | |
1187 | ||
1188 | /* If there is a (corresponding) variable or this is the address of a | |
1189 | constant, we only want to return the initializer if an lvalue isn't | |
1190 | required. Evaluate this now if we have not already done so. */ | |
1191 | if ((!constant_only || address_of_constant) && require_lvalue < 0) | |
1192 | require_lvalue | |
1193 | = lvalue_required_p (gnat_node, gnu_result_type, true, | |
1194 | address_of_constant, Is_Aliased (gnat_temp)); | |
1195 | ||
6ba4f08f | 1196 | /* Finally retrieve the initializer if this is deemed valid. */ |
cb3d597d | 1197 | if ((constant_only && !address_of_constant) || !require_lvalue) |
6ba4f08f | 1198 | gnu_result = DECL_INITIAL (gnu_result); |
a1ab4c31 AC |
1199 | } |
1200 | ||
e297e2ea EB |
1201 | /* But for a constant renaming we couldn't do that incrementally for its |
1202 | definition because of the need to return an lvalue so, if the present | |
1203 | context doesn't itself require an lvalue, we try again here. */ | |
1204 | else if (Ekind (gnat_temp) == E_Constant | |
1205 | && Is_Elementary_Type (gnat_temp_type) | |
1206 | && Present (Renamed_Object (gnat_temp))) | |
1207 | { | |
1208 | if (require_lvalue < 0) | |
1209 | require_lvalue | |
1210 | = lvalue_required_p (gnat_node, gnu_result_type, true, false, | |
1211 | Is_Aliased (gnat_temp)); | |
1212 | if (!require_lvalue) | |
1213 | gnu_result = fold_constant_decl_in_expr (gnu_result); | |
1214 | } | |
1215 | ||
1c4ae4e5 EB |
1216 | /* The GNAT tree has the type of a function set to its result type, so we |
1217 | adjust here. Also use the type of the result if the Etype is a subtype | |
1218 | that is nominally unconstrained. Likewise if this is a deferred constant | |
1219 | of a discriminated type whose full view can be elaborated statically, to | |
1220 | avoid problematic conversions to the nominal subtype. But remove any | |
1221 | padding from the resulting type. */ | |
1222 | if (TREE_CODE (TREE_TYPE (gnu_result)) == FUNCTION_TYPE | |
1223 | || Is_Constr_Subt_For_UN_Aliased (gnat_temp_type) | |
1224 | || (Ekind (gnat_temp) == E_Constant | |
1225 | && Present (Full_View (gnat_temp)) | |
1226 | && Has_Discriminants (gnat_temp_type) | |
1227 | && TREE_CODE (gnu_result) == CONSTRUCTOR)) | |
1228 | { | |
1229 | gnu_result_type = TREE_TYPE (gnu_result); | |
1230 | if (TYPE_IS_PADDING_P (gnu_result_type)) | |
1231 | gnu_result_type = TREE_TYPE (TYPE_FIELDS (gnu_result_type)); | |
1232 | } | |
1233 | ||
a1ab4c31 | 1234 | *gnu_result_type_p = gnu_result_type; |
58c8f770 | 1235 | |
a1ab4c31 AC |
1236 | return gnu_result; |
1237 | } | |
1238 | \f | |
1239 | /* Subroutine of gnat_to_gnu to process gnat_node, an N_Pragma. Return | |
1240 | any statements we generate. */ | |
1241 | ||
1242 | static tree | |
1243 | Pragma_to_gnu (Node_Id gnat_node) | |
1244 | { | |
47625858 | 1245 | tree gnu_result = alloc_stmt_list (); |
2749b01b | 1246 | unsigned char pragma_id; |
f2423384 | 1247 | Node_Id gnat_temp; |
a1ab4c31 | 1248 | |
633a3f2a EB |
1249 | /* Do nothing if we are just annotating types and check for (and ignore) |
1250 | unrecognized pragmas. */ | |
a1ab4c31 AC |
1251 | if (type_annotate_only |
1252 | || !Is_Pragma_Name (Chars (Pragma_Identifier (gnat_node)))) | |
1253 | return gnu_result; | |
1254 | ||
2749b01b EB |
1255 | pragma_id = Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node))); |
1256 | switch (pragma_id) | |
a1ab4c31 AC |
1257 | { |
1258 | case Pragma_Inspection_Point: | |
1259 | /* Do nothing at top level: all such variables are already viewable. */ | |
1260 | if (global_bindings_p ()) | |
1261 | break; | |
1262 | ||
1263 | for (gnat_temp = First (Pragma_Argument_Associations (gnat_node)); | |
1264 | Present (gnat_temp); | |
1265 | gnat_temp = Next (gnat_temp)) | |
1266 | { | |
1267 | Node_Id gnat_expr = Expression (gnat_temp); | |
1268 | tree gnu_expr = gnat_to_gnu (gnat_expr); | |
1269 | int use_address; | |
ef4bddc2 | 1270 | machine_mode mode; |
a1ab4c31 AC |
1271 | tree asm_constraint = NULL_TREE; |
1272 | #ifdef ASM_COMMENT_START | |
1273 | char *comment; | |
1274 | #endif | |
1275 | ||
1276 | if (TREE_CODE (gnu_expr) == UNCONSTRAINED_ARRAY_REF) | |
1277 | gnu_expr = TREE_OPERAND (gnu_expr, 0); | |
1278 | ||
1279 | /* Use the value only if it fits into a normal register, | |
1280 | otherwise use the address. */ | |
1281 | mode = TYPE_MODE (TREE_TYPE (gnu_expr)); | |
1282 | use_address = ((GET_MODE_CLASS (mode) != MODE_INT | |
1283 | && GET_MODE_CLASS (mode) != MODE_PARTIAL_INT) | |
1284 | || GET_MODE_SIZE (mode) > UNITS_PER_WORD); | |
1285 | ||
1286 | if (use_address) | |
1287 | gnu_expr = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr); | |
1288 | ||
1289 | #ifdef ASM_COMMENT_START | |
1290 | comment = concat (ASM_COMMENT_START, | |
1291 | " inspection point: ", | |
1292 | Get_Name_String (Chars (gnat_expr)), | |
1293 | use_address ? " address" : "", | |
1294 | " is in %0", | |
1295 | NULL); | |
1296 | asm_constraint = build_string (strlen (comment), comment); | |
1297 | free (comment); | |
1298 | #endif | |
1c384bf1 | 1299 | gnu_expr = build5 (ASM_EXPR, void_type_node, |
a1ab4c31 AC |
1300 | asm_constraint, |
1301 | NULL_TREE, | |
1302 | tree_cons | |
1303 | (build_tree_list (NULL_TREE, | |
1304 | build_string (1, "g")), | |
1305 | gnu_expr, NULL_TREE), | |
1c384bf1 | 1306 | NULL_TREE, NULL_TREE); |
a1ab4c31 AC |
1307 | ASM_VOLATILE_P (gnu_expr) = 1; |
1308 | set_expr_location_from_node (gnu_expr, gnat_node); | |
1309 | append_to_statement_list (gnu_expr, &gnu_result); | |
1310 | } | |
1311 | break; | |
1312 | ||
633a3f2a EB |
1313 | case Pragma_Loop_Optimize: |
1314 | for (gnat_temp = First (Pragma_Argument_Associations (gnat_node)); | |
1315 | Present (gnat_temp); | |
1316 | gnat_temp = Next (gnat_temp)) | |
1317 | { | |
3418f5e9 | 1318 | tree gnu_loop_stmt = gnu_loop_stack->last ()->stmt; |
633a3f2a EB |
1319 | |
1320 | switch (Chars (Expression (gnat_temp))) | |
1321 | { | |
3418f5e9 EB |
1322 | case Name_Ivdep: |
1323 | LOOP_STMT_IVDEP (gnu_loop_stmt) = 1; | |
1324 | break; | |
1325 | ||
633a3f2a EB |
1326 | case Name_No_Unroll: |
1327 | LOOP_STMT_NO_UNROLL (gnu_loop_stmt) = 1; | |
1328 | break; | |
1329 | ||
1330 | case Name_Unroll: | |
1331 | LOOP_STMT_UNROLL (gnu_loop_stmt) = 1; | |
1332 | break; | |
1333 | ||
1334 | case Name_No_Vector: | |
1335 | LOOP_STMT_NO_VECTOR (gnu_loop_stmt) = 1; | |
1336 | break; | |
1337 | ||
1338 | case Name_Vector: | |
1339 | LOOP_STMT_VECTOR (gnu_loop_stmt) = 1; | |
1340 | break; | |
1341 | ||
1342 | default: | |
1343 | gcc_unreachable (); | |
1344 | } | |
1345 | } | |
1346 | break; | |
1347 | ||
a1ab4c31 AC |
1348 | case Pragma_Optimize: |
1349 | switch (Chars (Expression | |
1350 | (First (Pragma_Argument_Associations (gnat_node))))) | |
1351 | { | |
a1ab4c31 | 1352 | case Name_Off: |
e84319a3 | 1353 | if (optimize) |
a1ab4c31 AC |
1354 | post_error ("must specify -O0?", gnat_node); |
1355 | break; | |
1356 | ||
257e81a6 EB |
1357 | case Name_Space: |
1358 | if (!optimize_size) | |
1359 | post_error ("must specify -Os?", gnat_node); | |
1360 | break; | |
1361 | ||
1362 | case Name_Time: | |
1363 | if (!optimize) | |
1364 | post_error ("insufficient -O value?", gnat_node); | |
1365 | break; | |
1366 | ||
a1ab4c31 AC |
1367 | default: |
1368 | gcc_unreachable (); | |
1369 | } | |
1370 | break; | |
1371 | ||
1372 | case Pragma_Reviewable: | |
1373 | if (write_symbols == NO_DEBUG) | |
1374 | post_error ("must specify -g?", gnat_node); | |
1375 | break; | |
f2423384 | 1376 | |
2749b01b | 1377 | case Pragma_Warning_As_Error: |
f2423384 EB |
1378 | case Pragma_Warnings: |
1379 | { | |
1380 | Node_Id gnat_expr; | |
1381 | /* Preserve the location of the pragma. */ | |
1382 | const location_t location = input_location; | |
1383 | struct cl_option_handlers handlers; | |
1384 | unsigned int option_index; | |
1385 | diagnostic_t kind; | |
1386 | bool imply; | |
1387 | ||
1388 | gnat_temp = First (Pragma_Argument_Associations (gnat_node)); | |
1389 | ||
2749b01b | 1390 | /* This is the String form: pragma Warning{s|_As_Error}(String). */ |
f2423384 EB |
1391 | if (Nkind (Expression (gnat_temp)) == N_String_Literal) |
1392 | { | |
2749b01b EB |
1393 | switch (pragma_id) |
1394 | { | |
1395 | case Pragma_Warning_As_Error: | |
1396 | kind = DK_ERROR; | |
1397 | imply = false; | |
1398 | break; | |
1399 | ||
1400 | case Pragma_Warnings: | |
1401 | kind = DK_WARNING; | |
1402 | imply = true; | |
1403 | break; | |
1404 | ||
1405 | default: | |
1406 | gcc_unreachable (); | |
1407 | } | |
1408 | ||
f2423384 | 1409 | gnat_expr = Expression (gnat_temp); |
f2423384 EB |
1410 | } |
1411 | ||
1412 | /* This is the On/Off form: pragma Warnings (On | Off [,String]). */ | |
1413 | else if (Nkind (Expression (gnat_temp)) == N_Identifier) | |
1414 | { | |
1415 | switch (Chars (Expression (gnat_temp))) | |
1416 | { | |
1417 | case Name_Off: | |
1418 | kind = DK_IGNORED; | |
1419 | break; | |
1420 | ||
1421 | case Name_On: | |
1422 | kind = DK_WARNING; | |
1423 | break; | |
1424 | ||
1425 | default: | |
1426 | gcc_unreachable (); | |
1427 | } | |
1428 | ||
f10ff6cc | 1429 | /* Deal with optional pattern (but ignore Reason => "..."). */ |
113c69ff EB |
1430 | if (Present (Next (gnat_temp)) |
1431 | && Chars (Next (gnat_temp)) != Name_Reason) | |
f2423384 EB |
1432 | { |
1433 | /* pragma Warnings (On | Off, Name) is handled differently. */ | |
1434 | if (Nkind (Expression (Next (gnat_temp))) != N_String_Literal) | |
1435 | break; | |
1436 | ||
1437 | gnat_expr = Expression (Next (gnat_temp)); | |
1438 | } | |
1439 | else | |
1440 | gnat_expr = Empty; | |
1441 | ||
1442 | imply = false; | |
1443 | } | |
1444 | ||
1445 | else | |
1446 | gcc_unreachable (); | |
1447 | ||
1448 | /* This is the same implementation as in the C family of compilers. */ | |
0cec1c2d | 1449 | const unsigned int lang_mask = CL_Ada | CL_COMMON; |
63bbf46d | 1450 | const char *arg = NULL; |
f2423384 EB |
1451 | if (Present (gnat_expr)) |
1452 | { | |
1453 | tree gnu_expr = gnat_to_gnu (gnat_expr); | |
0cec1c2d | 1454 | const char *option_string = TREE_STRING_POINTER (gnu_expr); |
f2423384 | 1455 | const int len = TREE_STRING_LENGTH (gnu_expr); |
0cec1c2d | 1456 | if (len < 3 || option_string[0] != '-' || option_string[1] != 'W') |
f2423384 | 1457 | break; |
0cec1c2d EB |
1458 | option_index = find_opt (option_string + 1, lang_mask); |
1459 | if (option_index == OPT_SPECIAL_unknown) | |
1460 | { | |
1461 | post_error ("?unknown -W switch", gnat_node); | |
f2423384 | 1462 | break; |
0cec1c2d EB |
1463 | } |
1464 | else if (!(cl_options[option_index].flags & CL_WARNING)) | |
1465 | { | |
1466 | post_error ("?-W switch does not control warning", gnat_node); | |
1467 | break; | |
1468 | } | |
1469 | else if (!(cl_options[option_index].flags & lang_mask)) | |
f2423384 | 1470 | { |
0cec1c2d | 1471 | post_error ("?-W switch not valid for Ada", gnat_node); |
f2423384 EB |
1472 | break; |
1473 | } | |
63bbf46d JJ |
1474 | if (cl_options[option_index].flags & CL_JOINED) |
1475 | arg = option_string + 1 + cl_options[option_index].opt_len; | |
f2423384 EB |
1476 | } |
1477 | else | |
1478 | option_index = 0; | |
1479 | ||
1480 | set_default_handlers (&handlers); | |
63bbf46d | 1481 | control_warning_option (option_index, (int) kind, arg, imply, location, |
0cec1c2d | 1482 | lang_mask, &handlers, &global_options, |
f2423384 EB |
1483 | &global_options_set, global_dc); |
1484 | } | |
1485 | break; | |
633a3f2a EB |
1486 | |
1487 | default: | |
1488 | break; | |
a1ab4c31 AC |
1489 | } |
1490 | ||
1491 | return gnu_result; | |
1492 | } | |
aa1aa786 | 1493 | \f |
87411e95 | 1494 | |
ae5a77fa | 1495 | /* Check the inline status of nested function FNDECL wrt its parent function. |
87411e95 EB |
1496 | |
1497 | If a non-inline nested function is referenced from an inline external | |
1498 | function, we cannot honor both requests at the same time without cloning | |
1499 | the nested function in the current unit since it is private to its unit. | |
1500 | We could inline it as well but it's probably better to err on the side | |
1501 | of too little inlining. | |
1502 | ||
ae5a77fa | 1503 | This must be done only on nested functions present in the source code |
87411e95 | 1504 | and not on nested functions generated by the compiler, e.g. finalizers, |
ae5a77fa EB |
1505 | because they may be not marked inline and we don't want them to block |
1506 | the inlining of the parent function. */ | |
87411e95 EB |
1507 | |
1508 | static void | |
1509 | check_inlining_for_nested_subprog (tree fndecl) | |
1510 | { | |
ae5a77fa EB |
1511 | if (DECL_IGNORED_P (current_function_decl) || DECL_IGNORED_P (fndecl)) |
1512 | return; | |
1513 | ||
1514 | if (DECL_DECLARED_INLINE_P (fndecl)) | |
1515 | return; | |
1516 | ||
1517 | tree parent_decl = decl_function_context (fndecl); | |
1518 | if (DECL_EXTERNAL (parent_decl) && DECL_DECLARED_INLINE_P (parent_decl)) | |
87411e95 EB |
1519 | { |
1520 | const location_t loc1 = DECL_SOURCE_LOCATION (fndecl); | |
ae5a77fa | 1521 | const location_t loc2 = DECL_SOURCE_LOCATION (parent_decl); |
87411e95 | 1522 | |
ae5a77fa | 1523 | if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (parent_decl))) |
87411e95 EB |
1524 | { |
1525 | error_at (loc1, "subprogram %q+F not marked Inline_Always", fndecl); | |
1526 | error_at (loc2, "parent subprogram cannot be inlined"); | |
1527 | } | |
1528 | else | |
1529 | { | |
1530 | warning_at (loc1, OPT_Winline, "subprogram %q+F not marked Inline", | |
1531 | fndecl); | |
1532 | warning_at (loc2, OPT_Winline, "parent subprogram cannot be inlined"); | |
1533 | } | |
1534 | ||
ae5a77fa EB |
1535 | DECL_DECLARED_INLINE_P (parent_decl) = 0; |
1536 | DECL_UNINLINABLE (parent_decl) = 1; | |
87411e95 EB |
1537 | } |
1538 | } | |
1539 | \f | |
1eb58520 AC |
1540 | /* Return an expression for the length of TYPE, an integral type, computed in |
1541 | RESULT_TYPE, another integral type. | |
1542 | ||
1543 | We used to compute the length as MAX (hb - lb + 1, 0) which could overflow | |
1544 | when lb == TYPE'First. We now compute it as (hb >= lb) ? hb - lb + 1 : 0 | |
1545 | which would only overflow in much rarer cases, for extremely large arrays | |
1546 | we expect never to encounter in practice. Besides, the former computation | |
1547 | required the use of potentially constraining signed arithmetics while the | |
1548 | latter does not. Note that the comparison must be done in the original | |
1549 | base index type in order to avoid any overflow during the conversion. */ | |
1550 | ||
1551 | static tree | |
1552 | get_type_length (tree type, tree result_type) | |
1553 | { | |
1554 | tree comp_type = get_base_type (result_type); | |
825da0d2 | 1555 | tree base_type = maybe_character_type (get_base_type (type)); |
1eb58520 AC |
1556 | tree lb = convert (base_type, TYPE_MIN_VALUE (type)); |
1557 | tree hb = convert (base_type, TYPE_MAX_VALUE (type)); | |
1558 | tree length | |
1559 | = build_binary_op (PLUS_EXPR, comp_type, | |
1560 | build_binary_op (MINUS_EXPR, comp_type, | |
1561 | convert (comp_type, hb), | |
1562 | convert (comp_type, lb)), | |
9a1bdc31 | 1563 | build_int_cst (comp_type, 1)); |
1eb58520 AC |
1564 | length |
1565 | = build_cond_expr (result_type, | |
1566 | build_binary_op (GE_EXPR, boolean_type_node, hb, lb), | |
1567 | convert (result_type, length), | |
9a1bdc31 | 1568 | build_int_cst (result_type, 0)); |
1eb58520 AC |
1569 | return length; |
1570 | } | |
1571 | ||
feec4372 | 1572 | /* Subroutine of gnat_to_gnu to translate GNAT_NODE, an N_Attribute node, |
a1ab4c31 AC |
1573 | to a GCC tree, which is returned. GNU_RESULT_TYPE_P is a pointer to |
1574 | where we should place the result type. ATTRIBUTE is the attribute ID. */ | |
1575 | ||
1576 | static tree | |
1577 | Attribute_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p, int attribute) | |
1578 | { | |
088d3b0f | 1579 | const Node_Id gnat_prefix = Prefix (gnat_node); |
1e55d29a EB |
1580 | tree gnu_prefix = gnat_to_gnu (gnat_prefix); |
1581 | tree gnu_type = TREE_TYPE (gnu_prefix); | |
1582 | tree gnu_expr, gnu_result_type, gnu_result = error_mark_node; | |
caa9d12a | 1583 | bool prefix_unused = false; |
a1ab4c31 AC |
1584 | |
1585 | /* If the input is a NULL_EXPR, make a new one. */ | |
1586 | if (TREE_CODE (gnu_prefix) == NULL_EXPR) | |
1587 | { | |
feec4372 EB |
1588 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); |
1589 | *gnu_result_type_p = gnu_result_type; | |
1590 | return build1 (NULL_EXPR, gnu_result_type, TREE_OPERAND (gnu_prefix, 0)); | |
a1ab4c31 AC |
1591 | } |
1592 | ||
1593 | switch (attribute) | |
1594 | { | |
1595 | case Attr_Pos: | |
1596 | case Attr_Val: | |
feec4372 EB |
1597 | /* These are just conversions since representation clauses for |
1598 | enumeration types are handled in the front-end. */ | |
825da0d2 EB |
1599 | gnu_expr = gnat_to_gnu (First (Expressions (gnat_node))); |
1600 | if (attribute == Attr_Pos) | |
1601 | gnu_expr = maybe_character_value (gnu_expr); | |
1602 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
1603 | gnu_result = convert (gnu_result_type, gnu_expr); | |
a1ab4c31 AC |
1604 | break; |
1605 | ||
1606 | case Attr_Pred: | |
1607 | case Attr_Succ: | |
feec4372 EB |
1608 | /* These just add or subtract the constant 1 since representation |
1609 | clauses for enumeration types are handled in the front-end. */ | |
a1ab4c31 AC |
1610 | gnu_expr = gnat_to_gnu (First (Expressions (gnat_node))); |
1611 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
825da0d2 EB |
1612 | gnu_type = maybe_character_type (gnu_result_type); |
1613 | if (TREE_TYPE (gnu_expr) != gnu_type) | |
1614 | gnu_expr = convert (gnu_type, gnu_expr); | |
a1ab4c31 | 1615 | gnu_result |
feec4372 | 1616 | = build_binary_op (attribute == Attr_Pred ? MINUS_EXPR : PLUS_EXPR, |
825da0d2 | 1617 | gnu_type, gnu_expr, build_int_cst (gnu_type, 1)); |
a1ab4c31 AC |
1618 | break; |
1619 | ||
1620 | case Attr_Address: | |
1621 | case Attr_Unrestricted_Access: | |
feec4372 EB |
1622 | /* Conversions don't change addresses but can cause us to miss the |
1623 | COMPONENT_REF case below, so strip them off. */ | |
a1ab4c31 AC |
1624 | gnu_prefix = remove_conversions (gnu_prefix, |
1625 | !Must_Be_Byte_Aligned (gnat_node)); | |
1626 | ||
1627 | /* If we are taking 'Address of an unconstrained object, this is the | |
1628 | pointer to the underlying array. */ | |
1629 | if (attribute == Attr_Address) | |
1630 | gnu_prefix = maybe_unconstrained_array (gnu_prefix); | |
1631 | ||
1632 | /* If we are building a static dispatch table, we have to honor | |
1633 | TARGET_VTABLE_USES_DESCRIPTORS if we want to be compatible | |
1634 | with the C++ ABI. We do it in the non-static case as well, | |
1635 | see gnat_to_gnu_entity, case E_Access_Subprogram_Type. */ | |
1636 | else if (TARGET_VTABLE_USES_DESCRIPTORS | |
1637 | && Is_Dispatch_Table_Entity (Etype (gnat_node))) | |
1638 | { | |
0e228dd9 | 1639 | tree gnu_field, t; |
a1ab4c31 AC |
1640 | /* Descriptors can only be built here for top-level functions. */ |
1641 | bool build_descriptor = (global_bindings_p () != 0); | |
1642 | int i; | |
9771b263 | 1643 | vec<constructor_elt, va_gc> *gnu_vec = NULL; |
0e228dd9 | 1644 | constructor_elt *elt; |
a1ab4c31 AC |
1645 | |
1646 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
1647 | ||
1648 | /* If we're not going to build the descriptor, we have to retrieve | |
1649 | the one which will be built by the linker (or by the compiler | |
1650 | later if a static chain is requested). */ | |
1651 | if (!build_descriptor) | |
1652 | { | |
1653 | gnu_result = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_prefix); | |
1654 | gnu_result = fold_convert (build_pointer_type (gnu_result_type), | |
1655 | gnu_result); | |
1656 | gnu_result = build1 (INDIRECT_REF, gnu_result_type, gnu_result); | |
1657 | } | |
1658 | ||
9771b263 DN |
1659 | vec_safe_grow (gnu_vec, TARGET_VTABLE_USES_DESCRIPTORS); |
1660 | elt = (gnu_vec->address () + TARGET_VTABLE_USES_DESCRIPTORS - 1); | |
a1ab4c31 AC |
1661 | for (gnu_field = TYPE_FIELDS (gnu_result_type), i = 0; |
1662 | i < TARGET_VTABLE_USES_DESCRIPTORS; | |
7d76717d | 1663 | gnu_field = DECL_CHAIN (gnu_field), i++) |
a1ab4c31 AC |
1664 | { |
1665 | if (build_descriptor) | |
1666 | { | |
1667 | t = build2 (FDESC_EXPR, TREE_TYPE (gnu_field), gnu_prefix, | |
1668 | build_int_cst (NULL_TREE, i)); | |
1669 | TREE_CONSTANT (t) = 1; | |
1670 | } | |
1671 | else | |
1672 | t = build3 (COMPONENT_REF, ptr_void_ftype, gnu_result, | |
1673 | gnu_field, NULL_TREE); | |
1674 | ||
0e228dd9 NF |
1675 | elt->index = gnu_field; |
1676 | elt->value = t; | |
1677 | elt--; | |
a1ab4c31 AC |
1678 | } |
1679 | ||
0e228dd9 | 1680 | gnu_result = gnat_build_constructor (gnu_result_type, gnu_vec); |
a1ab4c31 AC |
1681 | break; |
1682 | } | |
1683 | ||
1684 | /* ... fall through ... */ | |
1685 | ||
1686 | case Attr_Access: | |
1687 | case Attr_Unchecked_Access: | |
1688 | case Attr_Code_Address: | |
1689 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
1690 | gnu_result | |
1691 | = build_unary_op (((attribute == Attr_Address | |
1692 | || attribute == Attr_Unrestricted_Access) | |
1693 | && !Must_Be_Byte_Aligned (gnat_node)) | |
1694 | ? ATTR_ADDR_EXPR : ADDR_EXPR, | |
1695 | gnu_result_type, gnu_prefix); | |
1696 | ||
1697 | /* For 'Code_Address, find an inner ADDR_EXPR and mark it so that we | |
1e039275 | 1698 | don't try to build a trampoline. */ |
a1ab4c31 AC |
1699 | if (attribute == Attr_Code_Address) |
1700 | { | |
722356ce | 1701 | gnu_expr = remove_conversions (gnu_result, false); |
a1ab4c31 AC |
1702 | |
1703 | if (TREE_CODE (gnu_expr) == ADDR_EXPR) | |
1704 | TREE_NO_TRAMPOLINE (gnu_expr) = TREE_CONSTANT (gnu_expr) = 1; | |
1705 | } | |
1706 | ||
28dd0055 EB |
1707 | /* For 'Access, issue an error message if the prefix is a C++ method |
1708 | since it can use a special calling convention on some platforms, | |
1709 | which cannot be propagated to the access type. */ | |
1710 | else if (attribute == Attr_Access | |
088d3b0f EB |
1711 | && Nkind (gnat_prefix) == N_Identifier |
1712 | && is_cplusplus_method (Entity (gnat_prefix))) | |
28dd0055 EB |
1713 | post_error ("access to C++ constructor or member function not allowed", |
1714 | gnat_node); | |
1715 | ||
a1ab4c31 AC |
1716 | /* For other address attributes applied to a nested function, |
1717 | find an inner ADDR_EXPR and annotate it so that we can issue | |
1718 | a useful warning with -Wtrampolines. */ | |
1719 | else if (TREE_CODE (TREE_TYPE (gnu_prefix)) == FUNCTION_TYPE) | |
1720 | { | |
722356ce | 1721 | gnu_expr = remove_conversions (gnu_result, false); |
a1ab4c31 AC |
1722 | |
1723 | if (TREE_CODE (gnu_expr) == ADDR_EXPR | |
1724 | && decl_function_context (TREE_OPERAND (gnu_expr, 0))) | |
1725 | { | |
1726 | set_expr_location_from_node (gnu_expr, gnat_node); | |
1727 | ||
87411e95 EB |
1728 | /* Also check the inlining status. */ |
1729 | check_inlining_for_nested_subprog (TREE_OPERAND (gnu_expr, 0)); | |
1730 | ||
a1ab4c31 AC |
1731 | /* Check that we're not violating the No_Implicit_Dynamic_Code |
1732 | restriction. Be conservative if we don't know anything | |
1733 | about the trampoline strategy for the target. */ | |
1734 | Check_Implicit_Dynamic_Code_Allowed (gnat_node); | |
1735 | } | |
1736 | } | |
1737 | break; | |
1738 | ||
1739 | case Attr_Pool_Address: | |
1740 | { | |
a1ab4c31 | 1741 | tree gnu_ptr = gnu_prefix; |
0d7de0e1 | 1742 | tree gnu_obj_type; |
a1ab4c31 AC |
1743 | |
1744 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
1745 | ||
0d7de0e1 EB |
1746 | /* If this is fat pointer, the object must have been allocated with the |
1747 | template in front of the array. So compute the template address; do | |
1748 | it by converting to a thin pointer. */ | |
315cff15 | 1749 | if (TYPE_IS_FAT_POINTER_P (TREE_TYPE (gnu_ptr))) |
a1ab4c31 AC |
1750 | gnu_ptr |
1751 | = convert (build_pointer_type | |
1752 | (TYPE_OBJECT_RECORD_TYPE | |
1753 | (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (gnu_ptr)))), | |
1754 | gnu_ptr); | |
1755 | ||
1756 | gnu_obj_type = TREE_TYPE (TREE_TYPE (gnu_ptr)); | |
0d7de0e1 EB |
1757 | |
1758 | /* If this is a thin pointer, the object must have been allocated with | |
1759 | the template in front of the array. So compute the template address | |
1760 | and return it. */ | |
1761 | if (TYPE_IS_THIN_POINTER_P (TREE_TYPE (gnu_ptr))) | |
1762 | gnu_ptr | |
1763 | = build_binary_op (POINTER_PLUS_EXPR, TREE_TYPE (gnu_ptr), | |
1764 | gnu_ptr, | |
2b45154d EB |
1765 | fold_build1 (NEGATE_EXPR, sizetype, |
1766 | byte_position | |
1767 | (DECL_CHAIN | |
1768 | TYPE_FIELDS ((gnu_obj_type))))); | |
a1ab4c31 AC |
1769 | |
1770 | gnu_result = convert (gnu_result_type, gnu_ptr); | |
1771 | } | |
1772 | break; | |
1773 | ||
1774 | case Attr_Size: | |
1775 | case Attr_Object_Size: | |
1776 | case Attr_Value_Size: | |
1777 | case Attr_Max_Size_In_Storage_Elements: | |
1778 | gnu_expr = gnu_prefix; | |
1779 | ||
20faffe7 EB |
1780 | /* Remove NOPs and conversions between original and packable version |
1781 | from GNU_EXPR, and conversions from GNU_PREFIX. We use GNU_EXPR | |
1782 | to see if a COMPONENT_REF was involved. */ | |
1783 | while (TREE_CODE (gnu_expr) == NOP_EXPR | |
1784 | || (TREE_CODE (gnu_expr) == VIEW_CONVERT_EXPR | |
1785 | && TREE_CODE (TREE_TYPE (gnu_expr)) == RECORD_TYPE | |
1786 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))) | |
1787 | == RECORD_TYPE | |
1788 | && TYPE_NAME (TREE_TYPE (gnu_expr)) | |
1789 | == TYPE_NAME (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))))) | |
a1ab4c31 AC |
1790 | gnu_expr = TREE_OPERAND (gnu_expr, 0); |
1791 | ||
1792 | gnu_prefix = remove_conversions (gnu_prefix, true); | |
1793 | prefix_unused = true; | |
1794 | gnu_type = TREE_TYPE (gnu_prefix); | |
1795 | ||
1796 | /* Replace an unconstrained array type with the type of the underlying | |
1797 | array. We can't do this with a call to maybe_unconstrained_array | |
1798 | since we may have a TYPE_DECL. For 'Max_Size_In_Storage_Elements, | |
1799 | use the record type that will be used to allocate the object and its | |
1800 | template. */ | |
1801 | if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE) | |
1802 | { | |
1803 | gnu_type = TYPE_OBJECT_RECORD_TYPE (gnu_type); | |
1804 | if (attribute != Attr_Max_Size_In_Storage_Elements) | |
7d76717d | 1805 | gnu_type = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type))); |
a1ab4c31 AC |
1806 | } |
1807 | ||
842d4ee2 | 1808 | /* If we're looking for the size of a field, return the field size. */ |
a1ab4c31 AC |
1809 | if (TREE_CODE (gnu_prefix) == COMPONENT_REF) |
1810 | gnu_result = DECL_SIZE (TREE_OPERAND (gnu_prefix, 1)); | |
842d4ee2 EB |
1811 | |
1812 | /* Otherwise, if the prefix is an object, or if we are looking for | |
1813 | 'Object_Size or 'Max_Size_In_Storage_Elements, the result is the | |
1814 | GCC size of the type. We make an exception for padded objects, | |
1815 | as we do not take into account alignment promotions for the size. | |
1816 | This is in keeping with the object case of gnat_to_gnu_entity. */ | |
1817 | else if ((TREE_CODE (gnu_prefix) != TYPE_DECL | |
1818 | && !(TYPE_IS_PADDING_P (gnu_type) | |
1819 | && TREE_CODE (gnu_expr) == COMPONENT_REF)) | |
a1ab4c31 AC |
1820 | || attribute == Attr_Object_Size |
1821 | || attribute == Attr_Max_Size_In_Storage_Elements) | |
1822 | { | |
842d4ee2 EB |
1823 | /* If this is a dereference and we have a special dynamic constrained |
1824 | subtype on the prefix, use it to compute the size; otherwise, use | |
1825 | the designated subtype. */ | |
088d3b0f | 1826 | if (Nkind (gnat_prefix) == N_Explicit_Dereference) |
a1ab4c31 | 1827 | { |
1e17ef87 | 1828 | Node_Id gnat_actual_subtype |
088d3b0f | 1829 | = Actual_Designated_Subtype (gnat_prefix); |
1e17ef87 | 1830 | tree gnu_ptr_type |
088d3b0f | 1831 | = TREE_TYPE (gnat_to_gnu (Prefix (gnat_prefix))); |
1e17ef87 | 1832 | |
315cff15 | 1833 | if (TYPE_IS_FAT_OR_THIN_POINTER_P (gnu_ptr_type) |
1e17ef87 EB |
1834 | && Present (gnat_actual_subtype)) |
1835 | { | |
1836 | tree gnu_actual_obj_type | |
1837 | = gnat_to_gnu_type (gnat_actual_subtype); | |
1838 | gnu_type | |
1839 | = build_unc_object_type_from_ptr (gnu_ptr_type, | |
1840 | gnu_actual_obj_type, | |
928dfa4b EB |
1841 | get_identifier ("SIZE"), |
1842 | false); | |
1e17ef87 | 1843 | } |
a1ab4c31 | 1844 | } |
842d4ee2 EB |
1845 | |
1846 | gnu_result = TYPE_SIZE (gnu_type); | |
a1ab4c31 | 1847 | } |
842d4ee2 EB |
1848 | |
1849 | /* Otherwise, the result is the RM size of the type. */ | |
a1ab4c31 AC |
1850 | else |
1851 | gnu_result = rm_size (gnu_type); | |
1852 | ||
feec4372 | 1853 | /* Deal with a self-referential size by returning the maximum size for |
58c8f770 | 1854 | a type and by qualifying the size with the object otherwise. */ |
a1ab4c31 AC |
1855 | if (CONTAINS_PLACEHOLDER_P (gnu_result)) |
1856 | { | |
58c8f770 | 1857 | if (TREE_CODE (gnu_prefix) == TYPE_DECL) |
a1ab4c31 | 1858 | gnu_result = max_size (gnu_result, true); |
58c8f770 EB |
1859 | else |
1860 | gnu_result = substitute_placeholder_in_expr (gnu_result, gnu_expr); | |
a1ab4c31 AC |
1861 | } |
1862 | ||
1863 | /* If the type contains a template, subtract its size. */ | |
1864 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
1865 | && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) | |
1866 | gnu_result = size_binop (MINUS_EXPR, gnu_result, | |
1867 | DECL_SIZE (TYPE_FIELDS (gnu_type))); | |
1868 | ||
58c8f770 | 1869 | /* For 'Max_Size_In_Storage_Elements, adjust the unit. */ |
a1ab4c31 | 1870 | if (attribute == Attr_Max_Size_In_Storage_Elements) |
58c8f770 EB |
1871 | gnu_result = size_binop (CEIL_DIV_EXPR, gnu_result, bitsize_unit_node); |
1872 | ||
1873 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
a1ab4c31 AC |
1874 | break; |
1875 | ||
1876 | case Attr_Alignment: | |
caa9d12a EB |
1877 | { |
1878 | unsigned int align; | |
a1ab4c31 | 1879 | |
caa9d12a | 1880 | if (TREE_CODE (gnu_prefix) == COMPONENT_REF |
315cff15 | 1881 | && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))) |
caa9d12a | 1882 | gnu_prefix = TREE_OPERAND (gnu_prefix, 0); |
a1ab4c31 | 1883 | |
caa9d12a EB |
1884 | gnu_type = TREE_TYPE (gnu_prefix); |
1885 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
1886 | prefix_unused = true; | |
1887 | ||
1888 | if (TREE_CODE (gnu_prefix) == COMPONENT_REF) | |
1889 | align = DECL_ALIGN (TREE_OPERAND (gnu_prefix, 1)) / BITS_PER_UNIT; | |
1890 | else | |
1891 | { | |
caa9d12a EB |
1892 | Entity_Id gnat_type = Etype (gnat_prefix); |
1893 | unsigned int double_align; | |
1894 | bool is_capped_double, align_clause; | |
1895 | ||
1896 | /* If the default alignment of "double" or larger scalar types is | |
1897 | specifically capped and there is an alignment clause neither | |
1898 | on the type nor on the prefix itself, return the cap. */ | |
1899 | if ((double_align = double_float_alignment) > 0) | |
1900 | is_capped_double | |
1901 | = is_double_float_or_array (gnat_type, &align_clause); | |
1902 | else if ((double_align = double_scalar_alignment) > 0) | |
1903 | is_capped_double | |
1904 | = is_double_scalar_or_array (gnat_type, &align_clause); | |
1905 | else | |
1906 | is_capped_double = align_clause = false; | |
1907 | ||
1908 | if (is_capped_double | |
1909 | && Nkind (gnat_prefix) == N_Identifier | |
1910 | && Present (Alignment_Clause (Entity (gnat_prefix)))) | |
1911 | align_clause = true; | |
1912 | ||
1913 | if (is_capped_double && !align_clause) | |
1914 | align = double_align; | |
1915 | else | |
1916 | align = TYPE_ALIGN (gnu_type) / BITS_PER_UNIT; | |
1917 | } | |
1918 | ||
1919 | gnu_result = size_int (align); | |
1920 | } | |
a1ab4c31 AC |
1921 | break; |
1922 | ||
1923 | case Attr_First: | |
1924 | case Attr_Last: | |
1925 | case Attr_Range_Length: | |
1926 | prefix_unused = true; | |
1927 | ||
1928 | if (INTEGRAL_TYPE_P (gnu_type) || TREE_CODE (gnu_type) == REAL_TYPE) | |
1929 | { | |
1930 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
1931 | ||
1932 | if (attribute == Attr_First) | |
1933 | gnu_result = TYPE_MIN_VALUE (gnu_type); | |
1934 | else if (attribute == Attr_Last) | |
1935 | gnu_result = TYPE_MAX_VALUE (gnu_type); | |
1936 | else | |
1eb58520 | 1937 | gnu_result = get_type_length (gnu_type, gnu_result_type); |
a1ab4c31 AC |
1938 | break; |
1939 | } | |
1940 | ||
1941 | /* ... fall through ... */ | |
1942 | ||
1943 | case Attr_Length: | |
1944 | { | |
1945 | int Dimension = (Present (Expressions (gnat_node)) | |
1946 | ? UI_To_Int (Intval (First (Expressions (gnat_node)))) | |
1947 | : 1), i; | |
6bf68a93 | 1948 | struct parm_attr_d *pa = NULL; |
a1ab4c31 | 1949 | Entity_Id gnat_param = Empty; |
088d3b0f | 1950 | bool unconstrained_ptr_deref = false; |
a1ab4c31 AC |
1951 | |
1952 | /* Make sure any implicit dereference gets done. */ | |
1953 | gnu_prefix = maybe_implicit_deref (gnu_prefix); | |
1954 | gnu_prefix = maybe_unconstrained_array (gnu_prefix); | |
ad1d36ba | 1955 | |
088d3b0f EB |
1956 | /* We treat unconstrained array In parameters specially. We also note |
1957 | whether we are dereferencing a pointer to unconstrained array. */ | |
1958 | if (!Is_Constrained (Etype (gnat_prefix))) | |
1959 | switch (Nkind (gnat_prefix)) | |
1960 | { | |
1961 | case N_Identifier: | |
1962 | /* This is the direct case. */ | |
1963 | if (Ekind (Entity (gnat_prefix)) == E_In_Parameter) | |
1964 | gnat_param = Entity (gnat_prefix); | |
1965 | break; | |
1966 | ||
1967 | case N_Explicit_Dereference: | |
1968 | /* This is the indirect case. Note that we need to be sure that | |
1969 | the access value cannot be null as we'll hoist the load. */ | |
1970 | if (Nkind (Prefix (gnat_prefix)) == N_Identifier | |
1971 | && Ekind (Entity (Prefix (gnat_prefix))) == E_In_Parameter) | |
1972 | { | |
1973 | if (Can_Never_Be_Null (Entity (Prefix (gnat_prefix)))) | |
1974 | gnat_param = Entity (Prefix (gnat_prefix)); | |
1975 | } | |
1976 | else | |
1977 | unconstrained_ptr_deref = true; | |
1978 | break; | |
1979 | ||
1980 | default: | |
1981 | break; | |
ad1d36ba EB |
1982 | } |
1983 | ||
9b17f12b EB |
1984 | /* If the prefix is the view conversion of a constrained array to an |
1985 | unconstrained form, we retrieve the constrained array because we | |
1986 | might not be able to substitute the PLACEHOLDER_EXPR coming from | |
1987 | the conversion. This can occur with the 'Old attribute applied | |
1988 | to a parameter with an unconstrained type, which gets rewritten | |
1989 | into a constrained local variable very late in the game. */ | |
1990 | if (TREE_CODE (gnu_prefix) == VIEW_CONVERT_EXPR | |
1991 | && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (TREE_TYPE (gnu_prefix))) | |
1992 | && !CONTAINS_PLACEHOLDER_P | |
1993 | (TYPE_SIZE (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0))))) | |
1994 | gnu_type = TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)); | |
1995 | else | |
1996 | gnu_type = TREE_TYPE (gnu_prefix); | |
1997 | ||
a1ab4c31 AC |
1998 | prefix_unused = true; |
1999 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
2000 | ||
2001 | if (TYPE_CONVENTION_FORTRAN_P (gnu_type)) | |
2002 | { | |
2003 | int ndim; | |
2004 | tree gnu_type_temp; | |
2005 | ||
2006 | for (ndim = 1, gnu_type_temp = gnu_type; | |
2007 | TREE_CODE (TREE_TYPE (gnu_type_temp)) == ARRAY_TYPE | |
2008 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type_temp)); | |
2009 | ndim++, gnu_type_temp = TREE_TYPE (gnu_type_temp)) | |
2010 | ; | |
2011 | ||
2012 | Dimension = ndim + 1 - Dimension; | |
2013 | } | |
2014 | ||
2015 | for (i = 1; i < Dimension; i++) | |
2016 | gnu_type = TREE_TYPE (gnu_type); | |
2017 | ||
2018 | gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE); | |
2019 | ||
2020 | /* When not optimizing, look up the slot associated with the parameter | |
9a30c7c4 AC |
2021 | and the dimension in the cache and create a new one on failure. |
2022 | Don't do this when the actual subtype needs debug info (this happens | |
2023 | with -gnatD): in elaborate_expression_1, we create variables that | |
2024 | hold the bounds, so caching attributes isn't very interesting and | |
2025 | causes dependency issues between these variables and cached | |
2026 | expressions. */ | |
2027 | if (!optimize | |
2028 | && Present (gnat_param) | |
2029 | && !(Present (Actual_Subtype (gnat_param)) | |
2030 | && Needs_Debug_Info (Actual_Subtype (gnat_param)))) | |
a1ab4c31 | 2031 | { |
9771b263 | 2032 | FOR_EACH_VEC_SAFE_ELT (f_parm_attr_cache, i, pa) |
a1ab4c31 AC |
2033 | if (pa->id == gnat_param && pa->dim == Dimension) |
2034 | break; | |
2035 | ||
2036 | if (!pa) | |
2037 | { | |
766090c2 | 2038 | pa = ggc_cleared_alloc<parm_attr_d> (); |
a1ab4c31 AC |
2039 | pa->id = gnat_param; |
2040 | pa->dim = Dimension; | |
9771b263 | 2041 | vec_safe_push (f_parm_attr_cache, pa); |
a1ab4c31 AC |
2042 | } |
2043 | } | |
2044 | ||
2045 | /* Return the cached expression or build a new one. */ | |
2046 | if (attribute == Attr_First) | |
2047 | { | |
2048 | if (pa && pa->first) | |
2049 | { | |
2050 | gnu_result = pa->first; | |
2051 | break; | |
2052 | } | |
2053 | ||
2054 | gnu_result | |
2055 | = TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))); | |
2056 | } | |
2057 | ||
2058 | else if (attribute == Attr_Last) | |
2059 | { | |
2060 | if (pa && pa->last) | |
2061 | { | |
2062 | gnu_result = pa->last; | |
2063 | break; | |
2064 | } | |
2065 | ||
2066 | gnu_result | |
2067 | = TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))); | |
2068 | } | |
2069 | ||
2070 | else /* attribute == Attr_Range_Length || attribute == Attr_Length */ | |
2071 | { | |
2072 | if (pa && pa->length) | |
2073 | { | |
2074 | gnu_result = pa->length; | |
2075 | break; | |
2076 | } | |
1eb58520 AC |
2077 | |
2078 | gnu_result | |
2079 | = get_type_length (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)), | |
2080 | gnu_result_type); | |
a1ab4c31 AC |
2081 | } |
2082 | ||
2083 | /* If this has a PLACEHOLDER_EXPR, qualify it by the object we are | |
2084 | handling. Note that these attributes could not have been used on | |
2085 | an unconstrained array type. */ | |
4e6602a8 | 2086 | gnu_result = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_result, gnu_prefix); |
a1ab4c31 AC |
2087 | |
2088 | /* Cache the expression we have just computed. Since we want to do it | |
c01fe451 | 2089 | at run time, we force the use of a SAVE_EXPR and let the gimplifier |
586fea26 EB |
2090 | create the temporary in the outermost binding level. We will make |
2091 | sure in Subprogram_Body_to_gnu that it is evaluated on all possible | |
2092 | paths by forcing its evaluation on entry of the function. */ | |
a1ab4c31 AC |
2093 | if (pa) |
2094 | { | |
2095 | gnu_result | |
2096 | = build1 (SAVE_EXPR, TREE_TYPE (gnu_result), gnu_result); | |
088d3b0f EB |
2097 | switch (attribute) |
2098 | { | |
2099 | case Attr_First: | |
2100 | pa->first = gnu_result; | |
2101 | break; | |
2102 | ||
2103 | case Attr_Last: | |
2104 | pa->last = gnu_result; | |
2105 | break; | |
2106 | ||
2107 | case Attr_Length: | |
2108 | case Attr_Range_Length: | |
2109 | pa->length = gnu_result; | |
2110 | break; | |
2111 | ||
2112 | default: | |
2113 | gcc_unreachable (); | |
2114 | } | |
a1ab4c31 | 2115 | } |
321e10dd | 2116 | |
088d3b0f EB |
2117 | /* Otherwise, evaluate it each time it is referenced. */ |
2118 | else | |
2119 | switch (attribute) | |
2120 | { | |
2121 | case Attr_First: | |
2122 | case Attr_Last: | |
2123 | /* If we are dereferencing a pointer to unconstrained array, we | |
2124 | need to capture the value because the pointed-to bounds may | |
2125 | subsequently be released. */ | |
2126 | if (unconstrained_ptr_deref) | |
2127 | gnu_result | |
2128 | = build1 (SAVE_EXPR, TREE_TYPE (gnu_result), gnu_result); | |
2129 | break; | |
2130 | ||
2131 | case Attr_Length: | |
2132 | case Attr_Range_Length: | |
2133 | /* Set the source location onto the predicate of the condition | |
2134 | but not if the expression is cached to avoid messing up the | |
2135 | debug info. */ | |
2136 | if (TREE_CODE (gnu_result) == COND_EXPR | |
2137 | && EXPR_P (TREE_OPERAND (gnu_result, 0))) | |
2138 | set_expr_location_from_node (TREE_OPERAND (gnu_result, 0), | |
2139 | gnat_node); | |
2140 | break; | |
2141 | ||
2142 | default: | |
2143 | gcc_unreachable (); | |
2144 | } | |
321e10dd | 2145 | |
a1ab4c31 AC |
2146 | break; |
2147 | } | |
2148 | ||
2149 | case Attr_Bit_Position: | |
2150 | case Attr_Position: | |
2151 | case Attr_First_Bit: | |
2152 | case Attr_Last_Bit: | |
2153 | case Attr_Bit: | |
2154 | { | |
2155 | HOST_WIDE_INT bitsize; | |
2156 | HOST_WIDE_INT bitpos; | |
2157 | tree gnu_offset; | |
2158 | tree gnu_field_bitpos; | |
2159 | tree gnu_field_offset; | |
2160 | tree gnu_inner; | |
ef4bddc2 | 2161 | machine_mode mode; |
ee45a32d | 2162 | int unsignedp, reversep, volatilep; |
a1ab4c31 AC |
2163 | |
2164 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
2165 | gnu_prefix = remove_conversions (gnu_prefix, true); | |
2166 | prefix_unused = true; | |
2167 | ||
2168 | /* We can have 'Bit on any object, but if it isn't a COMPONENT_REF, | |
1e17ef87 | 2169 | the result is 0. Don't allow 'Bit on a bare component, though. */ |
a1ab4c31 AC |
2170 | if (attribute == Attr_Bit |
2171 | && TREE_CODE (gnu_prefix) != COMPONENT_REF | |
2172 | && TREE_CODE (gnu_prefix) != FIELD_DECL) | |
2173 | { | |
2174 | gnu_result = integer_zero_node; | |
2175 | break; | |
2176 | } | |
2177 | ||
2178 | else | |
2179 | gcc_assert (TREE_CODE (gnu_prefix) == COMPONENT_REF | |
2180 | || (attribute == Attr_Bit_Position | |
2181 | && TREE_CODE (gnu_prefix) == FIELD_DECL)); | |
2182 | ||
2183 | get_inner_reference (gnu_prefix, &bitsize, &bitpos, &gnu_offset, | |
ee45a32d | 2184 | &mode, &unsignedp, &reversep, &volatilep, false); |
a1ab4c31 AC |
2185 | |
2186 | if (TREE_CODE (gnu_prefix) == COMPONENT_REF) | |
2187 | { | |
2188 | gnu_field_bitpos = bit_position (TREE_OPERAND (gnu_prefix, 1)); | |
2189 | gnu_field_offset = byte_position (TREE_OPERAND (gnu_prefix, 1)); | |
2190 | ||
2191 | for (gnu_inner = TREE_OPERAND (gnu_prefix, 0); | |
2192 | TREE_CODE (gnu_inner) == COMPONENT_REF | |
2193 | && DECL_INTERNAL_P (TREE_OPERAND (gnu_inner, 1)); | |
2194 | gnu_inner = TREE_OPERAND (gnu_inner, 0)) | |
2195 | { | |
2196 | gnu_field_bitpos | |
2197 | = size_binop (PLUS_EXPR, gnu_field_bitpos, | |
2198 | bit_position (TREE_OPERAND (gnu_inner, 1))); | |
2199 | gnu_field_offset | |
2200 | = size_binop (PLUS_EXPR, gnu_field_offset, | |
2201 | byte_position (TREE_OPERAND (gnu_inner, 1))); | |
2202 | } | |
2203 | } | |
2204 | else if (TREE_CODE (gnu_prefix) == FIELD_DECL) | |
2205 | { | |
2206 | gnu_field_bitpos = bit_position (gnu_prefix); | |
2207 | gnu_field_offset = byte_position (gnu_prefix); | |
2208 | } | |
2209 | else | |
2210 | { | |
2211 | gnu_field_bitpos = bitsize_zero_node; | |
2212 | gnu_field_offset = size_zero_node; | |
2213 | } | |
2214 | ||
2215 | switch (attribute) | |
2216 | { | |
2217 | case Attr_Position: | |
2218 | gnu_result = gnu_field_offset; | |
2219 | break; | |
2220 | ||
2221 | case Attr_First_Bit: | |
2222 | case Attr_Bit: | |
2223 | gnu_result = size_int (bitpos % BITS_PER_UNIT); | |
2224 | break; | |
2225 | ||
2226 | case Attr_Last_Bit: | |
2227 | gnu_result = bitsize_int (bitpos % BITS_PER_UNIT); | |
2228 | gnu_result = size_binop (PLUS_EXPR, gnu_result, | |
2229 | TYPE_SIZE (TREE_TYPE (gnu_prefix))); | |
7cc15171 EB |
2230 | /* ??? Avoid a large unsigned result that will overflow when |
2231 | converted to the signed universal_integer. */ | |
2232 | if (integer_zerop (gnu_result)) | |
2233 | gnu_result = integer_minus_one_node; | |
2234 | else | |
2235 | gnu_result | |
2236 | = size_binop (MINUS_EXPR, gnu_result, bitsize_one_node); | |
a1ab4c31 AC |
2237 | break; |
2238 | ||
2239 | case Attr_Bit_Position: | |
2240 | gnu_result = gnu_field_bitpos; | |
2241 | break; | |
7cc15171 | 2242 | } |
a1ab4c31 | 2243 | |
feec4372 EB |
2244 | /* If this has a PLACEHOLDER_EXPR, qualify it by the object we are |
2245 | handling. */ | |
a1ab4c31 AC |
2246 | gnu_result = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_result, gnu_prefix); |
2247 | break; | |
2248 | } | |
2249 | ||
2250 | case Attr_Min: | |
2251 | case Attr_Max: | |
2252 | { | |
2253 | tree gnu_lhs = gnat_to_gnu (First (Expressions (gnat_node))); | |
2254 | tree gnu_rhs = gnat_to_gnu (Next (First (Expressions (gnat_node)))); | |
2255 | ||
2256 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
881cdd61 EB |
2257 | |
2258 | /* The result of {MIN,MAX}_EXPR is unspecified if either operand is | |
2259 | a NaN so we implement the semantics of C99 f{min,max} to make it | |
2260 | predictable in this case: if either operand is a NaN, the other | |
2261 | is returned; if both operands are NaN's, a NaN is returned. */ | |
89d5c50b EB |
2262 | if (SCALAR_FLOAT_TYPE_P (gnu_result_type) |
2263 | && !Machine_Overflows_On_Target) | |
881cdd61 EB |
2264 | { |
2265 | const bool lhs_side_effects_p = TREE_SIDE_EFFECTS (gnu_lhs); | |
2266 | const bool rhs_side_effects_p = TREE_SIDE_EFFECTS (gnu_rhs); | |
2267 | tree t = builtin_decl_explicit (BUILT_IN_ISNAN); | |
2268 | tree lhs_is_nan, rhs_is_nan; | |
2269 | ||
2270 | /* If the operands have side-effects, they need to be evaluated | |
2271 | only once in spite of the multiple references in the result. */ | |
2272 | if (lhs_side_effects_p) | |
2273 | gnu_lhs = gnat_protect_expr (gnu_lhs); | |
2274 | if (rhs_side_effects_p) | |
2275 | gnu_rhs = gnat_protect_expr (gnu_rhs); | |
2276 | ||
2277 | lhs_is_nan = fold_build2 (NE_EXPR, boolean_type_node, | |
2278 | build_call_expr (t, 1, gnu_lhs), | |
2279 | integer_zero_node); | |
2280 | ||
2281 | rhs_is_nan = fold_build2 (NE_EXPR, boolean_type_node, | |
2282 | build_call_expr (t, 1, gnu_rhs), | |
2283 | integer_zero_node); | |
2284 | ||
2285 | gnu_result = build_binary_op (attribute == Attr_Min | |
2286 | ? MIN_EXPR : MAX_EXPR, | |
2287 | gnu_result_type, gnu_lhs, gnu_rhs); | |
2288 | gnu_result = fold_build3 (COND_EXPR, gnu_result_type, | |
2289 | rhs_is_nan, gnu_lhs, gnu_result); | |
2290 | gnu_result = fold_build3 (COND_EXPR, gnu_result_type, | |
2291 | lhs_is_nan, gnu_rhs, gnu_result); | |
2292 | ||
2293 | /* If the operands have side-effects, they need to be evaluated | |
2294 | before doing the tests above since the place they otherwise | |
2295 | would end up being evaluated at run time could be wrong. */ | |
2296 | if (lhs_side_effects_p) | |
2297 | gnu_result | |
2298 | = build2 (COMPOUND_EXPR, gnu_result_type, gnu_lhs, gnu_result); | |
2299 | ||
2300 | if (rhs_side_effects_p) | |
2301 | gnu_result | |
2302 | = build2 (COMPOUND_EXPR, gnu_result_type, gnu_rhs, gnu_result); | |
2303 | } | |
2304 | else | |
2305 | gnu_result = build_binary_op (attribute == Attr_Min | |
2306 | ? MIN_EXPR : MAX_EXPR, | |
2307 | gnu_result_type, gnu_lhs, gnu_rhs); | |
a1ab4c31 AC |
2308 | } |
2309 | break; | |
2310 | ||
2311 | case Attr_Passed_By_Reference: | |
2312 | gnu_result = size_int (default_pass_by_ref (gnu_type) | |
2313 | || must_pass_by_ref (gnu_type)); | |
2314 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
2315 | break; | |
2316 | ||
2317 | case Attr_Component_Size: | |
2318 | if (TREE_CODE (gnu_prefix) == COMPONENT_REF | |
315cff15 | 2319 | && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))) |
a1ab4c31 AC |
2320 | gnu_prefix = TREE_OPERAND (gnu_prefix, 0); |
2321 | ||
2322 | gnu_prefix = maybe_implicit_deref (gnu_prefix); | |
2323 | gnu_type = TREE_TYPE (gnu_prefix); | |
2324 | ||
2325 | if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE) | |
2326 | gnu_type = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_type)))); | |
2327 | ||
2328 | while (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE | |
2329 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type))) | |
2330 | gnu_type = TREE_TYPE (gnu_type); | |
2331 | ||
2332 | gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE); | |
2333 | ||
2334 | /* Note this size cannot be self-referential. */ | |
2335 | gnu_result = TYPE_SIZE (TREE_TYPE (gnu_type)); | |
2336 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
2337 | prefix_unused = true; | |
2338 | break; | |
2339 | ||
203ddcea AC |
2340 | case Attr_Descriptor_Size: |
2341 | gnu_type = TREE_TYPE (gnu_prefix); | |
2342 | gcc_assert (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE); | |
2343 | ||
2b45154d EB |
2344 | /* What we want is the offset of the ARRAY field in the record |
2345 | that the thin pointer designates. */ | |
203ddcea | 2346 | gnu_type = TYPE_OBJECT_RECORD_TYPE (gnu_type); |
2b45154d | 2347 | gnu_result = bit_position (DECL_CHAIN (TYPE_FIELDS (gnu_type))); |
203ddcea AC |
2348 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); |
2349 | prefix_unused = true; | |
2350 | break; | |
2351 | ||
a1ab4c31 | 2352 | case Attr_Null_Parameter: |
feec4372 EB |
2353 | /* This is just a zero cast to the pointer type for our prefix and |
2354 | dereferenced. */ | |
a1ab4c31 AC |
2355 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); |
2356 | gnu_result | |
2357 | = build_unary_op (INDIRECT_REF, NULL_TREE, | |
2358 | convert (build_pointer_type (gnu_result_type), | |
2359 | integer_zero_node)); | |
2360 | TREE_PRIVATE (gnu_result) = 1; | |
2361 | break; | |
2362 | ||
2363 | case Attr_Mechanism_Code: | |
2364 | { | |
088d3b0f | 2365 | Entity_Id gnat_obj = Entity (gnat_prefix); |
a1ab4c31 | 2366 | int code; |
a1ab4c31 AC |
2367 | |
2368 | prefix_unused = true; | |
2369 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
2370 | if (Present (Expressions (gnat_node))) | |
2371 | { | |
2372 | int i = UI_To_Int (Intval (First (Expressions (gnat_node)))); | |
2373 | ||
2374 | for (gnat_obj = First_Formal (gnat_obj); i > 1; | |
2375 | i--, gnat_obj = Next_Formal (gnat_obj)) | |
2376 | ; | |
2377 | } | |
2378 | ||
2379 | code = Mechanism (gnat_obj); | |
2380 | if (code == Default) | |
2381 | code = ((present_gnu_tree (gnat_obj) | |
2382 | && (DECL_BY_REF_P (get_gnu_tree (gnat_obj)) | |
2383 | || ((TREE_CODE (get_gnu_tree (gnat_obj)) | |
2384 | == PARM_DECL) | |
2385 | && (DECL_BY_COMPONENT_PTR_P | |
2386 | (get_gnu_tree (gnat_obj)))))) | |
2387 | ? By_Reference : By_Copy); | |
2388 | gnu_result = convert (gnu_result_type, size_int (- code)); | |
2389 | } | |
2390 | break; | |
2391 | ||
24228312 AC |
2392 | case Attr_Model: |
2393 | /* We treat Model as identical to Machine. This is true for at least | |
2394 | IEEE and some other nice floating-point systems. */ | |
2395 | ||
2396 | /* ... fall through ... */ | |
2397 | ||
2398 | case Attr_Machine: | |
2399 | /* The trick is to force the compiler to store the result in memory so | |
2400 | that we do not have extra precision used. But do this only when this | |
1eb58520 AC |
2401 | is necessary, i.e. if FP_ARITH_MAY_WIDEN is true and the precision of |
2402 | the type is lower than that of the longest floating-point type. */ | |
24228312 AC |
2403 | prefix_unused = true; |
2404 | gnu_expr = gnat_to_gnu (First (Expressions (gnat_node))); | |
2405 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
2406 | gnu_result = convert (gnu_result_type, gnu_expr); | |
2407 | ||
c68cdfac EB |
2408 | if (TREE_CODE (gnu_result) != REAL_CST |
2409 | && fp_arith_may_widen | |
1eb58520 AC |
2410 | && TYPE_PRECISION (gnu_result_type) |
2411 | < TYPE_PRECISION (longest_float_type_node)) | |
24228312 AC |
2412 | { |
2413 | tree rec_type = make_node (RECORD_TYPE); | |
2414 | tree field | |
2415 | = create_field_decl (get_identifier ("OBJ"), gnu_result_type, | |
2416 | rec_type, NULL_TREE, NULL_TREE, 0, 0); | |
2417 | tree rec_val, asm_expr; | |
2418 | ||
2419 | finish_record_type (rec_type, field, 0, false); | |
2420 | ||
2421 | rec_val = build_constructor_single (rec_type, field, gnu_result); | |
c68cdfac | 2422 | rec_val = build1 (SAVE_EXPR, rec_type, rec_val); |
24228312 AC |
2423 | |
2424 | asm_expr | |
2425 | = build5 (ASM_EXPR, void_type_node, | |
2426 | build_string (0, ""), | |
2427 | tree_cons (build_tree_list (NULL_TREE, | |
2428 | build_string (2, "=m")), | |
2429 | rec_val, NULL_TREE), | |
2430 | tree_cons (build_tree_list (NULL_TREE, | |
2431 | build_string (1, "m")), | |
2432 | rec_val, NULL_TREE), | |
2433 | NULL_TREE, NULL_TREE); | |
2434 | ASM_VOLATILE_P (asm_expr) = 1; | |
2435 | ||
2436 | gnu_result | |
2437 | = build_compound_expr (gnu_result_type, asm_expr, | |
64235766 EB |
2438 | build_component_ref (rec_val, field, |
2439 | false)); | |
24228312 AC |
2440 | } |
2441 | break; | |
2442 | ||
06d75031 EB |
2443 | case Attr_Deref: |
2444 | prefix_unused = true; | |
2445 | gnu_expr = gnat_to_gnu (First (Expressions (gnat_node))); | |
2446 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
2447 | /* This can be a random address so build an alias-all pointer type. */ | |
2448 | gnu_expr | |
2449 | = convert (build_pointer_type_for_mode (gnu_result_type, ptr_mode, | |
2450 | true), | |
2451 | gnu_expr); | |
2452 | gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_expr); | |
2453 | break; | |
2454 | ||
a1ab4c31 | 2455 | default: |
010dffa9 EB |
2456 | /* This abort means that we have an unimplemented attribute. */ |
2457 | gcc_unreachable (); | |
a1ab4c31 AC |
2458 | } |
2459 | ||
2460 | /* If this is an attribute where the prefix was unused, force a use of it if | |
2461 | it has a side-effect. But don't do it if the prefix is just an entity | |
2462 | name. However, if an access check is needed, we must do it. See second | |
1e17ef87 | 2463 | example in AARM 11.6(5.e). */ |
088d3b0f EB |
2464 | if (prefix_unused |
2465 | && TREE_SIDE_EFFECTS (gnu_prefix) | |
2466 | && !Is_Entity_Name (gnat_prefix)) | |
2467 | gnu_result | |
24228312 | 2468 | = build_compound_expr (TREE_TYPE (gnu_result), gnu_prefix, gnu_result); |
a1ab4c31 AC |
2469 | |
2470 | *gnu_result_type_p = gnu_result_type; | |
2471 | return gnu_result; | |
2472 | } | |
2473 | \f | |
2474 | /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Case_Statement, | |
2475 | to a GCC tree, which is returned. */ | |
2476 | ||
2477 | static tree | |
2478 | Case_Statement_to_gnu (Node_Id gnat_node) | |
2479 | { | |
a31d78c6 | 2480 | tree gnu_result, gnu_expr, gnu_type, gnu_label; |
a1ab4c31 | 2481 | Node_Id gnat_when; |
2d3c7e4f | 2482 | location_t end_locus; |
83e279c4 | 2483 | bool may_fallthru = false; |
a1ab4c31 AC |
2484 | |
2485 | gnu_expr = gnat_to_gnu (Expression (gnat_node)); | |
2486 | gnu_expr = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr); | |
a31d78c6 EB |
2487 | gnu_expr = maybe_character_value (gnu_expr); |
2488 | gnu_type = TREE_TYPE (gnu_expr); | |
a1ab4c31 | 2489 | |
a1ab4c31 AC |
2490 | /* We build a SWITCH_EXPR that contains the code with interspersed |
2491 | CASE_LABEL_EXPRs for each label. */ | |
08b8b90c | 2492 | if (!Sloc_to_locus (End_Location (gnat_node), &end_locus)) |
2d3c7e4f EB |
2493 | end_locus = input_location; |
2494 | gnu_label = create_artificial_label (end_locus); | |
a1ab4c31 | 2495 | start_stmt_group (); |
b4f73deb | 2496 | |
a1ab4c31 AC |
2497 | for (gnat_when = First_Non_Pragma (Alternatives (gnat_node)); |
2498 | Present (gnat_when); | |
2499 | gnat_when = Next_Non_Pragma (gnat_when)) | |
2500 | { | |
9c69c3af | 2501 | bool choices_added_p = false; |
a1ab4c31 | 2502 | Node_Id gnat_choice; |
a1ab4c31 AC |
2503 | |
2504 | /* First compile all the different case choices for the current WHEN | |
2505 | alternative. */ | |
2506 | for (gnat_choice = First (Discrete_Choices (gnat_when)); | |
ac43e11e AC |
2507 | Present (gnat_choice); |
2508 | gnat_choice = Next (gnat_choice)) | |
a1ab4c31 AC |
2509 | { |
2510 | tree gnu_low = NULL_TREE, gnu_high = NULL_TREE; | |
ac43e11e | 2511 | tree label = create_artificial_label (input_location); |
a1ab4c31 AC |
2512 | |
2513 | switch (Nkind (gnat_choice)) | |
2514 | { | |
2515 | case N_Range: | |
2516 | gnu_low = gnat_to_gnu (Low_Bound (gnat_choice)); | |
2517 | gnu_high = gnat_to_gnu (High_Bound (gnat_choice)); | |
2518 | break; | |
2519 | ||
2520 | case N_Subtype_Indication: | |
2521 | gnu_low = gnat_to_gnu (Low_Bound (Range_Expression | |
2522 | (Constraint (gnat_choice)))); | |
2523 | gnu_high = gnat_to_gnu (High_Bound (Range_Expression | |
2524 | (Constraint (gnat_choice)))); | |
2525 | break; | |
2526 | ||
2527 | case N_Identifier: | |
2528 | case N_Expanded_Name: | |
2529 | /* This represents either a subtype range or a static value of | |
2530 | some kind; Ekind says which. */ | |
2531 | if (IN (Ekind (Entity (gnat_choice)), Type_Kind)) | |
2532 | { | |
2533 | tree gnu_type = get_unpadded_type (Entity (gnat_choice)); | |
2534 | ||
ac43e11e AC |
2535 | gnu_low = TYPE_MIN_VALUE (gnu_type); |
2536 | gnu_high = TYPE_MAX_VALUE (gnu_type); | |
a1ab4c31 AC |
2537 | break; |
2538 | } | |
2539 | ||
2540 | /* ... fall through ... */ | |
2541 | ||
2542 | case N_Character_Literal: | |
2543 | case N_Integer_Literal: | |
2544 | gnu_low = gnat_to_gnu (gnat_choice); | |
2545 | break; | |
2546 | ||
2547 | case N_Others_Choice: | |
2548 | break; | |
2549 | ||
2550 | default: | |
2551 | gcc_unreachable (); | |
2552 | } | |
2553 | ||
ac43e11e AC |
2554 | /* Everything should be folded into constants at this point. */ |
2555 | gcc_assert (!gnu_low || TREE_CODE (gnu_low) == INTEGER_CST); | |
2556 | gcc_assert (!gnu_high || TREE_CODE (gnu_high) == INTEGER_CST); | |
2557 | ||
a31d78c6 EB |
2558 | if (gnu_low && TREE_TYPE (gnu_low) != gnu_type) |
2559 | gnu_low = convert (gnu_type, gnu_low); | |
2560 | if (gnu_high && TREE_TYPE (gnu_high) != gnu_type) | |
2561 | gnu_high = convert (gnu_type, gnu_high); | |
2562 | ||
ac43e11e AC |
2563 | add_stmt_with_node (build_case_label (gnu_low, gnu_high, label), |
2564 | gnat_choice); | |
2565 | choices_added_p = true; | |
a1ab4c31 AC |
2566 | } |
2567 | ||
a1d7a124 EB |
2568 | /* This construct doesn't define a scope so we shouldn't push a binding |
2569 | level around the statement list. Except that we have always done so | |
2570 | historically and this makes it possible to reduce stack usage. As a | |
2571 | compromise, we keep doing it for case statements, for which this has | |
2572 | never been problematic, but not for case expressions in Ada 2012. */ | |
9c69c3af | 2573 | if (choices_added_p) |
a1ab4c31 | 2574 | { |
a1d7a124 EB |
2575 | const bool is_case_expression |
2576 | = (Nkind (Parent (gnat_node)) == N_Expression_With_Actions); | |
2577 | tree group | |
2578 | = build_stmt_group (Statements (gnat_when), !is_case_expression); | |
83e279c4 EB |
2579 | bool group_may_fallthru = block_may_fallthru (group); |
2580 | add_stmt (group); | |
2581 | if (group_may_fallthru) | |
2582 | { | |
2d3c7e4f EB |
2583 | tree stmt = build1 (GOTO_EXPR, void_type_node, gnu_label); |
2584 | SET_EXPR_LOCATION (stmt, end_locus); | |
2585 | add_stmt (stmt); | |
83e279c4 EB |
2586 | may_fallthru = true; |
2587 | } | |
a1ab4c31 AC |
2588 | } |
2589 | } | |
2590 | ||
41a961e9 | 2591 | /* Now emit a definition of the label the cases branch to, if any. */ |
83e279c4 EB |
2592 | if (may_fallthru) |
2593 | add_stmt (build1 (LABEL_EXPR, void_type_node, gnu_label)); | |
a31d78c6 EB |
2594 | gnu_result |
2595 | = build3 (SWITCH_EXPR, gnu_type, gnu_expr, end_stmt_group (), NULL_TREE); | |
a1ab4c31 AC |
2596 | |
2597 | return gnu_result; | |
2598 | } | |
2599 | \f | |
87ab2b04 EB |
2600 | /* Return true if we are in the body of a loop. */ |
2601 | ||
2602 | static inline bool | |
2603 | inside_loop_p (void) | |
2604 | { | |
2605 | return !vec_safe_is_empty (gnu_loop_stack); | |
2606 | } | |
2607 | ||
933a7325 EB |
2608 | /* Find out whether EXPR is a simple additive expression based on the iteration |
2609 | variable of some enclosing loop in the current function. If so, return the | |
2610 | loop and set *DISP to the displacement and *NEG_P to true if this is for a | |
2611 | subtraction; otherwise, return NULL. */ | |
15bf7d19 | 2612 | |
87ab2b04 | 2613 | static struct loop_info_d * |
933a7325 | 2614 | find_loop_for (tree expr, tree *disp = NULL, bool *neg_p = NULL) |
15bf7d19 | 2615 | { |
933a7325 EB |
2616 | tree var, add, cst; |
2617 | bool minus_p; | |
15bf7d19 EB |
2618 | struct loop_info_d *iter = NULL; |
2619 | unsigned int i; | |
2620 | ||
933a7325 EB |
2621 | if (is_simple_additive_expression (expr, &add, &cst, &minus_p)) |
2622 | { | |
2623 | var = add; | |
2624 | if (disp) | |
2625 | *disp = cst; | |
2626 | if (neg_p) | |
2627 | *neg_p = minus_p; | |
2628 | } | |
2629 | else | |
2630 | { | |
2631 | var = expr; | |
2632 | if (disp) | |
2633 | *disp = NULL_TREE; | |
2634 | if (neg_p) | |
2635 | *neg_p = false; | |
2636 | } | |
2637 | ||
722356ce | 2638 | var = remove_conversions (var, false); |
15bf7d19 EB |
2639 | |
2640 | if (TREE_CODE (var) != VAR_DECL) | |
2641 | return NULL; | |
2642 | ||
2643 | if (decl_function_context (var) != current_function_decl) | |
2644 | return NULL; | |
2645 | ||
90b4c164 EB |
2646 | gcc_assert (vec_safe_length (gnu_loop_stack) > 0); |
2647 | ||
547bbe49 | 2648 | FOR_EACH_VEC_ELT_REVERSE (*gnu_loop_stack, i, iter) |
15bf7d19 EB |
2649 | if (var == iter->loop_var) |
2650 | break; | |
2651 | ||
87ab2b04 | 2652 | return iter; |
15bf7d19 EB |
2653 | } |
2654 | ||
d88bbbb9 EB |
2655 | /* Return true if VAL (of type TYPE) can equal the minimum value if MAX is |
2656 | false, or the maximum value if MAX is true, of TYPE. */ | |
2657 | ||
2658 | static bool | |
2659 | can_equal_min_or_max_val_p (tree val, tree type, bool max) | |
2660 | { | |
2661 | tree min_or_max_val = (max ? TYPE_MAX_VALUE (type) : TYPE_MIN_VALUE (type)); | |
2662 | ||
2663 | if (TREE_CODE (min_or_max_val) != INTEGER_CST) | |
2664 | return true; | |
2665 | ||
2666 | if (TREE_CODE (val) == NOP_EXPR) | |
2667 | val = (max | |
2668 | ? TYPE_MAX_VALUE (TREE_TYPE (TREE_OPERAND (val, 0))) | |
2669 | : TYPE_MIN_VALUE (TREE_TYPE (TREE_OPERAND (val, 0)))); | |
2670 | ||
2671 | if (TREE_CODE (val) != INTEGER_CST) | |
2672 | return true; | |
2673 | ||
2efdbf0f EB |
2674 | if (max) |
2675 | return tree_int_cst_lt (val, min_or_max_val) == 0; | |
2676 | else | |
2677 | return tree_int_cst_lt (min_or_max_val, val) == 0; | |
d88bbbb9 EB |
2678 | } |
2679 | ||
2680 | /* Return true if VAL (of type TYPE) can equal the minimum value of TYPE. | |
2681 | If REVERSE is true, minimum value is taken as maximum value. */ | |
2682 | ||
2683 | static inline bool | |
2684 | can_equal_min_val_p (tree val, tree type, bool reverse) | |
2685 | { | |
2686 | return can_equal_min_or_max_val_p (val, type, reverse); | |
2687 | } | |
2688 | ||
2689 | /* Return true if VAL (of type TYPE) can equal the maximum value of TYPE. | |
2690 | If REVERSE is true, maximum value is taken as minimum value. */ | |
2691 | ||
2692 | static inline bool | |
2693 | can_equal_max_val_p (tree val, tree type, bool reverse) | |
2694 | { | |
2695 | return can_equal_min_or_max_val_p (val, type, !reverse); | |
2696 | } | |
2697 | ||
5128d641 EB |
2698 | /* Return true if VAL1 can be lower than VAL2. */ |
2699 | ||
2700 | static bool | |
2701 | can_be_lower_p (tree val1, tree val2) | |
2702 | { | |
2703 | if (TREE_CODE (val1) == NOP_EXPR) | |
2704 | val1 = TYPE_MIN_VALUE (TREE_TYPE (TREE_OPERAND (val1, 0))); | |
2705 | ||
2706 | if (TREE_CODE (val1) != INTEGER_CST) | |
2707 | return true; | |
2708 | ||
2709 | if (TREE_CODE (val2) == NOP_EXPR) | |
2710 | val2 = TYPE_MAX_VALUE (TREE_TYPE (TREE_OPERAND (val2, 0))); | |
2711 | ||
2712 | if (TREE_CODE (val2) != INTEGER_CST) | |
2713 | return true; | |
2714 | ||
2715 | return tree_int_cst_lt (val1, val2); | |
2716 | } | |
2717 | ||
64235766 EB |
2718 | /* Replace EXPR1 and EXPR2 by invariant expressions if possible. Return |
2719 | true if both expressions have been replaced and false otherwise. */ | |
2720 | ||
2721 | static bool | |
2722 | make_invariant (tree *expr1, tree *expr2) | |
2723 | { | |
2724 | tree inv_expr1 = gnat_invariant_expr (*expr1); | |
2725 | tree inv_expr2 = gnat_invariant_expr (*expr2); | |
2726 | ||
2727 | if (inv_expr1) | |
2728 | *expr1 = inv_expr1; | |
2729 | ||
2730 | if (inv_expr2) | |
2731 | *expr2 = inv_expr2; | |
2732 | ||
2733 | return inv_expr1 && inv_expr2; | |
2734 | } | |
2735 | ||
1ddde8dc EB |
2736 | /* Helper function for walk_tree, used by independent_iterations_p below. */ |
2737 | ||
2738 | static tree | |
2739 | scan_rhs_r (tree *tp, int *walk_subtrees, void *data) | |
2740 | { | |
2741 | bitmap *params = (bitmap *)data; | |
2742 | tree t = *tp; | |
2743 | ||
2744 | /* No need to walk into types or decls. */ | |
2745 | if (IS_TYPE_OR_DECL_P (t)) | |
2746 | *walk_subtrees = 0; | |
2747 | ||
2748 | if (TREE_CODE (t) == PARM_DECL && bitmap_bit_p (*params, DECL_UID (t))) | |
2749 | return t; | |
2750 | ||
2751 | return NULL_TREE; | |
2752 | } | |
2753 | ||
2754 | /* Return true if STMT_LIST generates independent iterations in a loop. */ | |
2755 | ||
2756 | static bool | |
2757 | independent_iterations_p (tree stmt_list) | |
2758 | { | |
2759 | tree_stmt_iterator tsi; | |
2760 | bitmap params = BITMAP_GGC_ALLOC(); | |
2761 | auto_vec<tree> rhs; | |
2762 | tree iter; | |
2763 | int i; | |
2764 | ||
2765 | if (TREE_CODE (stmt_list) == BIND_EXPR) | |
2766 | stmt_list = BIND_EXPR_BODY (stmt_list); | |
2767 | ||
2768 | /* Scan the list and return false on anything that is not either a check | |
2769 | or an assignment to a parameter with restricted aliasing. */ | |
2770 | for (tsi = tsi_start (stmt_list); !tsi_end_p (tsi); tsi_next (&tsi)) | |
2771 | { | |
2772 | tree stmt = tsi_stmt (tsi); | |
2773 | ||
2774 | switch (TREE_CODE (stmt)) | |
2775 | { | |
2776 | case COND_EXPR: | |
2777 | { | |
2778 | if (COND_EXPR_ELSE (stmt)) | |
2779 | return false; | |
2780 | if (TREE_CODE (COND_EXPR_THEN (stmt)) != CALL_EXPR) | |
2781 | return false; | |
2782 | tree func = get_callee_fndecl (COND_EXPR_THEN (stmt)); | |
2783 | if (!(func && TREE_THIS_VOLATILE (func))) | |
2784 | return false; | |
2785 | break; | |
2786 | } | |
2787 | ||
2788 | case MODIFY_EXPR: | |
2789 | { | |
2790 | tree lhs = TREE_OPERAND (stmt, 0); | |
2791 | while (handled_component_p (lhs)) | |
2792 | lhs = TREE_OPERAND (lhs, 0); | |
2793 | if (TREE_CODE (lhs) != INDIRECT_REF) | |
2794 | return false; | |
2795 | lhs = TREE_OPERAND (lhs, 0); | |
2796 | if (!(TREE_CODE (lhs) == PARM_DECL | |
2797 | && DECL_RESTRICTED_ALIASING_P (lhs))) | |
2798 | return false; | |
2799 | bitmap_set_bit (params, DECL_UID (lhs)); | |
2800 | rhs.safe_push (TREE_OPERAND (stmt, 1)); | |
2801 | break; | |
2802 | } | |
2803 | ||
2804 | default: | |
2805 | return false; | |
2806 | } | |
2807 | } | |
2808 | ||
2809 | /* At this point we know that the list contains only statements that will | |
2810 | modify parameters with restricted aliasing. Check that the statements | |
2811 | don't at the time read from these parameters. */ | |
2812 | FOR_EACH_VEC_ELT (rhs, i, iter) | |
2813 | if (walk_tree_without_duplicates (&iter, scan_rhs_r, ¶ms)) | |
2814 | return false; | |
2815 | ||
2816 | return true; | |
2817 | } | |
2818 | ||
a1ab4c31 AC |
2819 | /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Loop_Statement, |
2820 | to a GCC tree, which is returned. */ | |
2821 | ||
2822 | static tree | |
2823 | Loop_Statement_to_gnu (Node_Id gnat_node) | |
2824 | { | |
58c8f770 | 2825 | const Node_Id gnat_iter_scheme = Iteration_Scheme (gnat_node); |
766090c2 | 2826 | struct loop_info_d *gnu_loop_info = ggc_cleared_alloc<loop_info_d> (); |
d88bbbb9 EB |
2827 | tree gnu_loop_stmt = build4 (LOOP_STMT, void_type_node, NULL_TREE, |
2828 | NULL_TREE, NULL_TREE, NULL_TREE); | |
58c8f770 | 2829 | tree gnu_loop_label = create_artificial_label (input_location); |
15bf7d19 EB |
2830 | tree gnu_cond_expr = NULL_TREE, gnu_low = NULL_TREE, gnu_high = NULL_TREE; |
2831 | tree gnu_result; | |
2832 | ||
2833 | /* Push the loop_info structure associated with the LOOP_STMT. */ | |
9771b263 | 2834 | vec_safe_push (gnu_loop_stack, gnu_loop_info); |
a1ab4c31 | 2835 | |
58c8f770 | 2836 | /* Set location information for statement and end label. */ |
a1ab4c31 AC |
2837 | set_expr_location_from_node (gnu_loop_stmt, gnat_node); |
2838 | Sloc_to_locus (Sloc (End_Label (gnat_node)), | |
58c8f770 EB |
2839 | &DECL_SOURCE_LOCATION (gnu_loop_label)); |
2840 | LOOP_STMT_LABEL (gnu_loop_stmt) = gnu_loop_label; | |
a1ab4c31 | 2841 | |
633a3f2a EB |
2842 | /* Save the statement for later reuse. */ |
2843 | gnu_loop_info->stmt = gnu_loop_stmt; | |
87ab2b04 | 2844 | gnu_loop_info->artificial = !Comes_From_Source (gnat_node); |
a1ab4c31 | 2845 | |
7fda1596 EB |
2846 | /* Set the condition under which the loop must keep going. |
2847 | For the case "LOOP .... END LOOP;" the condition is always true. */ | |
a1ab4c31 AC |
2848 | if (No (gnat_iter_scheme)) |
2849 | ; | |
7fda1596 EB |
2850 | |
2851 | /* For the case "WHILE condition LOOP ..... END LOOP;" it's immediate. */ | |
a1ab4c31 | 2852 | else if (Present (Condition (gnat_iter_scheme))) |
d88bbbb9 | 2853 | LOOP_STMT_COND (gnu_loop_stmt) |
a1ab4c31 | 2854 | = gnat_to_gnu (Condition (gnat_iter_scheme)); |
7fda1596 | 2855 | |
58c8f770 EB |
2856 | /* Otherwise we have an iteration scheme and the condition is given by the |
2857 | bounds of the subtype of the iteration variable. */ | |
a1ab4c31 AC |
2858 | else |
2859 | { | |
a1ab4c31 AC |
2860 | Node_Id gnat_loop_spec = Loop_Parameter_Specification (gnat_iter_scheme); |
2861 | Entity_Id gnat_loop_var = Defining_Entity (gnat_loop_spec); | |
2862 | Entity_Id gnat_type = Etype (gnat_loop_var); | |
2863 | tree gnu_type = get_unpadded_type (gnat_type); | |
825da0d2 | 2864 | tree gnu_base_type = maybe_character_type (get_base_type (gnu_type)); |
9a1bdc31 | 2865 | tree gnu_one_node = build_int_cst (gnu_base_type, 1); |
6162cec0 | 2866 | tree gnu_loop_var, gnu_loop_iv, gnu_first, gnu_last, gnu_stmt; |
d88bbbb9 | 2867 | enum tree_code update_code, test_code, shift_code; |
6162cec0 | 2868 | bool reverse = Reverse_Present (gnat_loop_spec), use_iv = false; |
82d3b03a | 2869 | |
1eb58520 AC |
2870 | gnu_low = convert (gnu_base_type, TYPE_MIN_VALUE (gnu_type)); |
2871 | gnu_high = convert (gnu_base_type, TYPE_MAX_VALUE (gnu_type)); | |
15bf7d19 | 2872 | |
58c8f770 | 2873 | /* We must disable modulo reduction for the iteration variable, if any, |
82d3b03a | 2874 | in order for the loop comparison to be effective. */ |
d88bbbb9 | 2875 | if (reverse) |
82d3b03a EB |
2876 | { |
2877 | gnu_first = gnu_high; | |
2878 | gnu_last = gnu_low; | |
2879 | update_code = MINUS_NOMOD_EXPR; | |
58c8f770 | 2880 | test_code = GE_EXPR; |
d88bbbb9 | 2881 | shift_code = PLUS_NOMOD_EXPR; |
82d3b03a EB |
2882 | } |
2883 | else | |
2884 | { | |
2885 | gnu_first = gnu_low; | |
2886 | gnu_last = gnu_high; | |
2887 | update_code = PLUS_NOMOD_EXPR; | |
58c8f770 | 2888 | test_code = LE_EXPR; |
d88bbbb9 EB |
2889 | shift_code = MINUS_NOMOD_EXPR; |
2890 | } | |
2891 | ||
2892 | /* We use two different strategies to translate the loop, depending on | |
2893 | whether optimization is enabled. | |
2894 | ||
6162cec0 EB |
2895 | If it is, we generate the canonical loop form expected by the loop |
2896 | optimizer and the loop vectorizer, which is the do-while form: | |
d88bbbb9 EB |
2897 | |
2898 | ENTRY_COND | |
2899 | loop: | |
2900 | TOP_UPDATE | |
2901 | BODY | |
2902 | BOTTOM_COND | |
2903 | GOTO loop | |
2904 | ||
6162cec0 EB |
2905 | This avoids an implicit dependency on loop header copying and makes |
2906 | it possible to turn BOTTOM_COND into an inequality test. | |
2907 | ||
2908 | If optimization is disabled, loop header copying doesn't come into | |
2909 | play and we try to generate the loop form with the fewer conditional | |
2910 | branches. First, the default form, which is: | |
d88bbbb9 EB |
2911 | |
2912 | loop: | |
2913 | TOP_COND | |
2914 | BODY | |
2915 | BOTTOM_UPDATE | |
2916 | GOTO loop | |
2917 | ||
6162cec0 EB |
2918 | It should catch most loops with constant ending point. Then, if we |
2919 | cannot, we try to generate the shifted form: | |
d88bbbb9 | 2920 | |
d88bbbb9 | 2921 | loop: |
6162cec0 EB |
2922 | TOP_COND |
2923 | TOP_UPDATE | |
d88bbbb9 | 2924 | BODY |
d88bbbb9 EB |
2925 | GOTO loop |
2926 | ||
6162cec0 EB |
2927 | which should catch loops with constant starting point. Otherwise, if |
2928 | we cannot, we generate the fallback form: | |
d88bbbb9 | 2929 | |
6162cec0 | 2930 | ENTRY_COND |
d88bbbb9 | 2931 | loop: |
d88bbbb9 | 2932 | BODY |
6162cec0 EB |
2933 | BOTTOM_COND |
2934 | BOTTOM_UPDATE | |
d88bbbb9 EB |
2935 | GOTO loop |
2936 | ||
6162cec0 | 2937 | which works in all cases. */ |
d88bbbb9 EB |
2938 | |
2939 | if (optimize) | |
2940 | { | |
6162cec0 EB |
2941 | /* We can use the do-while form directly if GNU_FIRST-1 doesn't |
2942 | overflow. */ | |
d88bbbb9 | 2943 | if (!can_equal_min_val_p (gnu_first, gnu_base_type, reverse)) |
d88bbbb9 EB |
2944 | ; |
2945 | ||
6162cec0 | 2946 | /* Otherwise, use the do-while form with the help of a special |
15bf7d19 | 2947 | induction variable in the unsigned version of the base type |
48d3d75d | 2948 | or the unsigned version of the size type, whichever is the |
15bf7d19 | 2949 | largest, in order to have wrap-around arithmetics for it. */ |
d88bbbb9 | 2950 | else |
6162cec0 | 2951 | { |
48d3d75d EB |
2952 | if (TYPE_PRECISION (gnu_base_type) |
2953 | > TYPE_PRECISION (size_type_node)) | |
00a22e5e EB |
2954 | gnu_base_type |
2955 | = gnat_type_for_size (TYPE_PRECISION (gnu_base_type), 1); | |
15bf7d19 | 2956 | else |
48d3d75d | 2957 | gnu_base_type = size_type_node; |
15bf7d19 EB |
2958 | |
2959 | gnu_first = convert (gnu_base_type, gnu_first); | |
2960 | gnu_last = convert (gnu_base_type, gnu_last); | |
9a1bdc31 | 2961 | gnu_one_node = build_int_cst (gnu_base_type, 1); |
6162cec0 EB |
2962 | use_iv = true; |
2963 | } | |
2964 | ||
2965 | gnu_first | |
2966 | = build_binary_op (shift_code, gnu_base_type, gnu_first, | |
2967 | gnu_one_node); | |
2968 | LOOP_STMT_TOP_UPDATE_P (gnu_loop_stmt) = 1; | |
2969 | LOOP_STMT_BOTTOM_COND_P (gnu_loop_stmt) = 1; | |
d88bbbb9 EB |
2970 | } |
2971 | else | |
2972 | { | |
2973 | /* We can use the default form if GNU_LAST+1 doesn't overflow. */ | |
2974 | if (!can_equal_max_val_p (gnu_last, gnu_base_type, reverse)) | |
2975 | ; | |
2976 | ||
2977 | /* Otherwise, we can use the shifted form if neither GNU_FIRST-1 nor | |
2978 | GNU_LAST-1 does. */ | |
2979 | else if (!can_equal_min_val_p (gnu_first, gnu_base_type, reverse) | |
2980 | && !can_equal_min_val_p (gnu_last, gnu_base_type, reverse)) | |
2981 | { | |
6162cec0 EB |
2982 | gnu_first |
2983 | = build_binary_op (shift_code, gnu_base_type, gnu_first, | |
2984 | gnu_one_node); | |
2985 | gnu_last | |
2986 | = build_binary_op (shift_code, gnu_base_type, gnu_last, | |
2987 | gnu_one_node); | |
d88bbbb9 EB |
2988 | LOOP_STMT_TOP_UPDATE_P (gnu_loop_stmt) = 1; |
2989 | } | |
2990 | ||
2991 | /* Otherwise, use the fallback form. */ | |
2992 | else | |
6162cec0 | 2993 | LOOP_STMT_BOTTOM_COND_P (gnu_loop_stmt) = 1; |
82d3b03a | 2994 | } |
a1ab4c31 | 2995 | |
d88bbbb9 | 2996 | /* If we use the BOTTOM_COND, we can turn the test into an inequality |
5128d641 | 2997 | test but we may have to add ENTRY_COND to protect the empty loop. */ |
d88bbbb9 | 2998 | if (LOOP_STMT_BOTTOM_COND_P (gnu_loop_stmt)) |
a1ab4c31 | 2999 | { |
d88bbbb9 | 3000 | test_code = NE_EXPR; |
5128d641 EB |
3001 | if (can_be_lower_p (gnu_high, gnu_low)) |
3002 | { | |
3003 | gnu_cond_expr | |
3004 | = build3 (COND_EXPR, void_type_node, | |
3005 | build_binary_op (LE_EXPR, boolean_type_node, | |
3006 | gnu_low, gnu_high), | |
3007 | NULL_TREE, alloc_stmt_list ()); | |
3008 | set_expr_location_from_node (gnu_cond_expr, gnat_loop_spec); | |
3009 | } | |
a1ab4c31 AC |
3010 | } |
3011 | ||
3012 | /* Open a new nesting level that will surround the loop to declare the | |
58c8f770 | 3013 | iteration variable. */ |
a1ab4c31 AC |
3014 | start_stmt_group (); |
3015 | gnat_pushlevel (); | |
3016 | ||
6162cec0 EB |
3017 | /* If we use the special induction variable, create it and set it to |
3018 | its initial value. Morever, the regular iteration variable cannot | |
3019 | itself be initialized, lest the initial value wrapped around. */ | |
3020 | if (use_iv) | |
3021 | { | |
3022 | gnu_loop_iv | |
3023 | = create_init_temporary ("I", gnu_first, &gnu_stmt, gnat_loop_var); | |
3024 | add_stmt (gnu_stmt); | |
3025 | gnu_first = NULL_TREE; | |
3026 | } | |
3027 | else | |
3028 | gnu_loop_iv = NULL_TREE; | |
3029 | ||
58c8f770 | 3030 | /* Declare the iteration variable and set it to its initial value. */ |
afc737f0 | 3031 | gnu_loop_var = gnat_to_gnu_entity (gnat_loop_var, gnu_first, true); |
a1ab4c31 AC |
3032 | if (DECL_BY_REF_P (gnu_loop_var)) |
3033 | gnu_loop_var = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_loop_var); | |
15bf7d19 EB |
3034 | else if (use_iv) |
3035 | { | |
3036 | gcc_assert (DECL_LOOP_PARM_P (gnu_loop_var)); | |
3037 | SET_DECL_INDUCTION_VAR (gnu_loop_var, gnu_loop_iv); | |
3038 | } | |
3039 | gnu_loop_info->loop_var = gnu_loop_var; | |
87ab2b04 EB |
3040 | gnu_loop_info->low_bound = gnu_low; |
3041 | gnu_loop_info->high_bound = gnu_high; | |
a1ab4c31 | 3042 | |
58c8f770 EB |
3043 | /* Do all the arithmetics in the base type. */ |
3044 | gnu_loop_var = convert (gnu_base_type, gnu_loop_var); | |
a1ab4c31 | 3045 | |
d88bbbb9 | 3046 | /* Set either the top or bottom exit condition. */ |
6162cec0 EB |
3047 | if (use_iv) |
3048 | LOOP_STMT_COND (gnu_loop_stmt) | |
3049 | = build_binary_op (test_code, boolean_type_node, gnu_loop_iv, | |
3050 | gnu_last); | |
3051 | else | |
3052 | LOOP_STMT_COND (gnu_loop_stmt) | |
3053 | = build_binary_op (test_code, boolean_type_node, gnu_loop_var, | |
3054 | gnu_last); | |
a1ab4c31 | 3055 | |
d88bbbb9 EB |
3056 | /* Set either the top or bottom update statement and give it the source |
3057 | location of the iteration for better coverage info. */ | |
6162cec0 EB |
3058 | if (use_iv) |
3059 | { | |
3060 | gnu_stmt | |
3061 | = build_binary_op (MODIFY_EXPR, NULL_TREE, gnu_loop_iv, | |
3062 | build_binary_op (update_code, gnu_base_type, | |
3063 | gnu_loop_iv, gnu_one_node)); | |
3064 | set_expr_location_from_node (gnu_stmt, gnat_iter_scheme); | |
3065 | append_to_statement_list (gnu_stmt, | |
3066 | &LOOP_STMT_UPDATE (gnu_loop_stmt)); | |
3067 | gnu_stmt | |
3068 | = build_binary_op (MODIFY_EXPR, NULL_TREE, gnu_loop_var, | |
3069 | gnu_loop_iv); | |
3070 | set_expr_location_from_node (gnu_stmt, gnat_iter_scheme); | |
3071 | append_to_statement_list (gnu_stmt, | |
3072 | &LOOP_STMT_UPDATE (gnu_loop_stmt)); | |
3073 | } | |
3074 | else | |
3075 | { | |
3076 | gnu_stmt | |
3077 | = build_binary_op (MODIFY_EXPR, NULL_TREE, gnu_loop_var, | |
3078 | build_binary_op (update_code, gnu_base_type, | |
3079 | gnu_loop_var, gnu_one_node)); | |
3080 | set_expr_location_from_node (gnu_stmt, gnat_iter_scheme); | |
3081 | LOOP_STMT_UPDATE (gnu_loop_stmt) = gnu_stmt; | |
3082 | } | |
a1ab4c31 AC |
3083 | } |
3084 | ||
3085 | /* If the loop was named, have the name point to this loop. In this case, | |
58c8f770 | 3086 | the association is not a DECL node, but the end label of the loop. */ |
a1ab4c31 | 3087 | if (Present (Identifier (gnat_node))) |
58c8f770 | 3088 | save_gnu_tree (Entity (Identifier (gnat_node)), gnu_loop_label, true); |
a1ab4c31 AC |
3089 | |
3090 | /* Make the loop body into its own block, so any allocated storage will be | |
3091 | released every iteration. This is needed for stack allocation. */ | |
3092 | LOOP_STMT_BODY (gnu_loop_stmt) | |
3093 | = build_stmt_group (Statements (gnat_node), true); | |
58c8f770 | 3094 | TREE_SIDE_EFFECTS (gnu_loop_stmt) = 1; |
a1ab4c31 | 3095 | |
6162cec0 EB |
3096 | /* If we have an iteration scheme, then we are in a statement group. Add |
3097 | the LOOP_STMT to it, finish it and make it the "loop". */ | |
3098 | if (Present (gnat_iter_scheme) && No (Condition (gnat_iter_scheme))) | |
a1ab4c31 | 3099 | { |
64235766 EB |
3100 | /* First, if we have computed invariant conditions for range (or index) |
3101 | checks applied to the iteration variable, find out whether they can | |
3102 | be evaluated to false at compile time; otherwise, if there are not | |
3103 | too many of them, combine them with the original checks. If loop | |
3104 | unswitching is enabled, do not require the loop bounds to be also | |
3105 | invariant, as their evaluation will still be ahead of the loop. */ | |
3106 | if (vec_safe_length (gnu_loop_info->checks) > 0 | |
3107 | && (make_invariant (&gnu_low, &gnu_high) || flag_unswitch_loops)) | |
3108 | { | |
3109 | struct range_check_info_d *rci; | |
3110 | unsigned int i, n_remaining_checks = 0; | |
3111 | ||
3112 | FOR_EACH_VEC_ELT (*gnu_loop_info->checks, i, rci) | |
3113 | { | |
933a7325 EB |
3114 | tree low_ok, high_ok; |
3115 | ||
3116 | if (rci->low_bound) | |
3117 | { | |
3118 | tree gnu_adjusted_low = convert (rci->type, gnu_low); | |
3119 | if (rci->disp) | |
3120 | gnu_adjusted_low | |
3121 | = fold_build2 (rci->neg_p ? MINUS_EXPR : PLUS_EXPR, | |
3122 | rci->type, gnu_adjusted_low, rci->disp); | |
3123 | low_ok | |
3124 | = build_binary_op (GE_EXPR, boolean_type_node, | |
3125 | gnu_adjusted_low, rci->low_bound); | |
3126 | } | |
3127 | else | |
3128 | low_ok = boolean_true_node; | |
3129 | ||
3130 | if (rci->high_bound) | |
3131 | { | |
3132 | tree gnu_adjusted_high = convert (rci->type, gnu_high); | |
3133 | if (rci->disp) | |
3134 | gnu_adjusted_high | |
3135 | = fold_build2 (rci->neg_p ? MINUS_EXPR : PLUS_EXPR, | |
3136 | rci->type, gnu_adjusted_high, rci->disp); | |
3137 | high_ok | |
3138 | = build_binary_op (LE_EXPR, boolean_type_node, | |
3139 | gnu_adjusted_high, rci->high_bound); | |
3140 | } | |
3141 | else | |
3142 | high_ok = boolean_true_node; | |
64235766 EB |
3143 | |
3144 | tree range_ok | |
3145 | = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, | |
3146 | low_ok, high_ok); | |
3147 | ||
3148 | rci->invariant_cond | |
3149 | = build_unary_op (TRUTH_NOT_EXPR, boolean_type_node, range_ok); | |
3150 | ||
3151 | if (rci->invariant_cond == boolean_false_node) | |
3152 | TREE_OPERAND (rci->inserted_cond, 0) = rci->invariant_cond; | |
3153 | else | |
3154 | n_remaining_checks++; | |
3155 | } | |
3156 | ||
3157 | /* Note that loop unswitching can only be applied a small number of | |
3158 | times to a given loop (PARAM_MAX_UNSWITCH_LEVEL default to 3). */ | |
3159 | if (0 < n_remaining_checks && n_remaining_checks <= 3 | |
3160 | && optimize > 1 && !optimize_size) | |
3161 | FOR_EACH_VEC_ELT (*gnu_loop_info->checks, i, rci) | |
3162 | if (rci->invariant_cond != boolean_false_node) | |
3163 | { | |
3164 | TREE_OPERAND (rci->inserted_cond, 0) = rci->invariant_cond; | |
3165 | ||
3166 | if (flag_unswitch_loops) | |
3167 | add_stmt_with_node_force (rci->inserted_cond, gnat_node); | |
3168 | } | |
3169 | } | |
15bf7d19 | 3170 | |
1ddde8dc EB |
3171 | /* Second, if loop vectorization is enabled and the iterations of the |
3172 | loop can easily be proved as independent, mark the loop. */ | |
3173 | if (optimize | |
3174 | && flag_tree_loop_vectorize | |
3175 | && independent_iterations_p (LOOP_STMT_BODY (gnu_loop_stmt))) | |
3176 | LOOP_STMT_IVDEP (gnu_loop_stmt) = 1; | |
3177 | ||
a1ab4c31 AC |
3178 | add_stmt (gnu_loop_stmt); |
3179 | gnat_poplevel (); | |
3180 | gnu_loop_stmt = end_stmt_group (); | |
3181 | } | |
3182 | ||
3183 | /* If we have an outer COND_EXPR, that's our result and this loop is its | |
7fda1596 | 3184 | "true" statement. Otherwise, the result is the LOOP_STMT. */ |
a1ab4c31 AC |
3185 | if (gnu_cond_expr) |
3186 | { | |
3187 | COND_EXPR_THEN (gnu_cond_expr) = gnu_loop_stmt; | |
66c14933 | 3188 | TREE_SIDE_EFFECTS (gnu_cond_expr) = 1; |
a1ab4c31 | 3189 | gnu_result = gnu_cond_expr; |
a1ab4c31 AC |
3190 | } |
3191 | else | |
3192 | gnu_result = gnu_loop_stmt; | |
3193 | ||
9771b263 | 3194 | gnu_loop_stack->pop (); |
a1ab4c31 AC |
3195 | |
3196 | return gnu_result; | |
3197 | } | |
3198 | \f | |
71196d4e EB |
3199 | /* This page implements a form of Named Return Value optimization modelled |
3200 | on the C++ optimization of the same name. The main difference is that | |
3201 | we disregard any semantical considerations when applying it here, the | |
3202 | counterpart being that we don't try to apply it to semantically loaded | |
a0b8b1b7 | 3203 | return types, i.e. types with the TYPE_BY_REFERENCE_P flag set. |
71196d4e EB |
3204 | |
3205 | We consider a function body of the following GENERIC form: | |
3206 | ||
3207 | return_type R1; | |
3208 | [...] | |
3209 | RETURN_EXPR [<retval> = ...] | |
3210 | [...] | |
3211 | RETURN_EXPR [<retval> = R1] | |
3212 | [...] | |
3213 | return_type Ri; | |
3214 | [...] | |
3215 | RETURN_EXPR [<retval> = ...] | |
3216 | [...] | |
3217 | RETURN_EXPR [<retval> = Ri] | |
3218 | [...] | |
3219 | ||
3220 | and we try to fulfill a simple criterion that would make it possible to | |
3221 | replace one or several Ri variables with the RESULT_DECL of the function. | |
3222 | ||
3223 | The first observation is that RETURN_EXPRs that don't directly reference | |
3224 | any of the Ri variables on the RHS of their assignment are transparent wrt | |
3225 | the optimization. This is because the Ri variables aren't addressable so | |
3226 | any transformation applied to them doesn't affect the RHS; moreover, the | |
3227 | assignment writes the full <retval> object so existing values are entirely | |
3228 | discarded. | |
3229 | ||
3230 | This property can be extended to some forms of RETURN_EXPRs that reference | |
3231 | the Ri variables, for example CONSTRUCTORs, but isn't true in the general | |
3232 | case, in particular when function calls are involved. | |
3233 | ||
3234 | Therefore the algorithm is as follows: | |
3235 | ||
3236 | 1. Collect the list of candidates for a Named Return Value (Ri variables | |
3237 | on the RHS of assignments of RETURN_EXPRs) as well as the list of the | |
3238 | other expressions on the RHS of such assignments. | |
3239 | ||
3240 | 2. Prune the members of the first list (candidates) that are referenced | |
3241 | by a member of the second list (expressions). | |
3242 | ||
3243 | 3. Extract a set of candidates with non-overlapping live ranges from the | |
3244 | first list. These are the Named Return Values. | |
3245 | ||
3246 | 4. Adjust the relevant RETURN_EXPRs and replace the occurrences of the | |
088b91c7 EB |
3247 | Named Return Values in the function with the RESULT_DECL. |
3248 | ||
3249 | If the function returns an unconstrained type, things are a bit different | |
3250 | because the anonymous return object is allocated on the secondary stack | |
3251 | and RESULT_DECL is only a pointer to it. Each return object can be of a | |
3252 | different size and is allocated separately so we need not care about the | |
3253 | aforementioned overlapping issues. Therefore, we don't collect the other | |
3254 | expressions and skip step #2 in the algorithm. */ | |
71196d4e EB |
3255 | |
3256 | struct nrv_data | |
3257 | { | |
3258 | bitmap nrv; | |
3259 | tree result; | |
088b91c7 | 3260 | Node_Id gnat_ret; |
6e2830c3 | 3261 | hash_set<tree> *visited; |
71196d4e EB |
3262 | }; |
3263 | ||
3264 | /* Return true if T is a Named Return Value. */ | |
3265 | ||
3266 | static inline bool | |
3267 | is_nrv_p (bitmap nrv, tree t) | |
3268 | { | |
3269 | return TREE_CODE (t) == VAR_DECL && bitmap_bit_p (nrv, DECL_UID (t)); | |
3270 | } | |
3271 | ||
3272 | /* Helper function for walk_tree, used by finalize_nrv below. */ | |
3273 | ||
3274 | static tree | |
3275 | prune_nrv_r (tree *tp, int *walk_subtrees, void *data) | |
3276 | { | |
3277 | struct nrv_data *dp = (struct nrv_data *)data; | |
3278 | tree t = *tp; | |
3279 | ||
3280 | /* No need to walk into types or decls. */ | |
3281 | if (IS_TYPE_OR_DECL_P (t)) | |
3282 | *walk_subtrees = 0; | |
3283 | ||
3284 | if (is_nrv_p (dp->nrv, t)) | |
3285 | bitmap_clear_bit (dp->nrv, DECL_UID (t)); | |
3286 | ||
3287 | return NULL_TREE; | |
3288 | } | |
3289 | ||
3290 | /* Prune Named Return Values in BLOCK and return true if there is still a | |
3291 | Named Return Value in BLOCK or one of its sub-blocks. */ | |
3292 | ||
3293 | static bool | |
3294 | prune_nrv_in_block (bitmap nrv, tree block) | |
3295 | { | |
3296 | bool has_nrv = false; | |
3297 | tree t; | |
3298 | ||
3299 | /* First recurse on the sub-blocks. */ | |
3300 | for (t = BLOCK_SUBBLOCKS (block); t; t = BLOCK_CHAIN (t)) | |
3301 | has_nrv |= prune_nrv_in_block (nrv, t); | |
3302 | ||
3303 | /* Then make sure to keep at most one NRV per block. */ | |
3304 | for (t = BLOCK_VARS (block); t; t = DECL_CHAIN (t)) | |
3305 | if (is_nrv_p (nrv, t)) | |
3306 | { | |
3307 | if (has_nrv) | |
3308 | bitmap_clear_bit (nrv, DECL_UID (t)); | |
3309 | else | |
3310 | has_nrv = true; | |
3311 | } | |
3312 | ||
3313 | return has_nrv; | |
3314 | } | |
3315 | ||
3316 | /* Helper function for walk_tree, used by finalize_nrv below. */ | |
3317 | ||
3318 | static tree | |
3319 | finalize_nrv_r (tree *tp, int *walk_subtrees, void *data) | |
3320 | { | |
3321 | struct nrv_data *dp = (struct nrv_data *)data; | |
3322 | tree t = *tp; | |
3323 | ||
3324 | /* No need to walk into types. */ | |
3325 | if (TYPE_P (t)) | |
3326 | *walk_subtrees = 0; | |
3327 | ||
3328 | /* Change RETURN_EXPRs of NRVs to just refer to the RESULT_DECL; this is a | |
3329 | nop, but differs from using NULL_TREE in that it indicates that we care | |
3330 | about the value of the RESULT_DECL. */ | |
3331 | else if (TREE_CODE (t) == RETURN_EXPR | |
d864aeeb | 3332 | && TREE_CODE (TREE_OPERAND (t, 0)) == INIT_EXPR) |
71196d4e | 3333 | { |
5d2a63dc | 3334 | tree ret_val = TREE_OPERAND (TREE_OPERAND (t, 0), 1); |
71196d4e EB |
3335 | |
3336 | /* Strip useless conversions around the return value. */ | |
3337 | if (gnat_useless_type_conversion (ret_val)) | |
3338 | ret_val = TREE_OPERAND (ret_val, 0); | |
3339 | ||
3340 | if (is_nrv_p (dp->nrv, ret_val)) | |
5d2a63dc | 3341 | TREE_OPERAND (t, 0) = dp->result; |
71196d4e EB |
3342 | } |
3343 | ||
3344 | /* Replace the DECL_EXPR of NRVs with an initialization of the RESULT_DECL, | |
3345 | if needed. */ | |
3346 | else if (TREE_CODE (t) == DECL_EXPR | |
3347 | && is_nrv_p (dp->nrv, DECL_EXPR_DECL (t))) | |
3348 | { | |
3349 | tree var = DECL_EXPR_DECL (t), init; | |
3350 | ||
3351 | if (DECL_INITIAL (var)) | |
3352 | { | |
3353 | init = build_binary_op (INIT_EXPR, NULL_TREE, dp->result, | |
3354 | DECL_INITIAL (var)); | |
3355 | SET_EXPR_LOCATION (init, EXPR_LOCATION (t)); | |
3356 | DECL_INITIAL (var) = NULL_TREE; | |
3357 | } | |
3358 | else | |
3359 | init = build_empty_stmt (EXPR_LOCATION (t)); | |
3360 | *tp = init; | |
3361 | ||
3362 | /* Identify the NRV to the RESULT_DECL for debugging purposes. */ | |
3363 | SET_DECL_VALUE_EXPR (var, dp->result); | |
3364 | DECL_HAS_VALUE_EXPR_P (var) = 1; | |
3365 | /* ??? Kludge to avoid an assertion failure during inlining. */ | |
3366 | DECL_SIZE (var) = bitsize_unit_node; | |
3367 | DECL_SIZE_UNIT (var) = size_one_node; | |
3368 | } | |
3369 | ||
3370 | /* And replace all uses of NRVs with the RESULT_DECL. */ | |
3371 | else if (is_nrv_p (dp->nrv, t)) | |
3372 | *tp = convert (TREE_TYPE (t), dp->result); | |
3373 | ||
3374 | /* Avoid walking into the same tree more than once. Unfortunately, we | |
088b91c7 EB |
3375 | can't just use walk_tree_without_duplicates because it would only |
3376 | call us for the first occurrence of NRVs in the function body. */ | |
6e2830c3 | 3377 | if (dp->visited->add (*tp)) |
088b91c7 EB |
3378 | *walk_subtrees = 0; |
3379 | ||
3380 | return NULL_TREE; | |
3381 | } | |
3382 | ||
3383 | /* Likewise, but used when the function returns an unconstrained type. */ | |
3384 | ||
3385 | static tree | |
3386 | finalize_nrv_unc_r (tree *tp, int *walk_subtrees, void *data) | |
3387 | { | |
3388 | struct nrv_data *dp = (struct nrv_data *)data; | |
3389 | tree t = *tp; | |
3390 | ||
3391 | /* No need to walk into types. */ | |
3392 | if (TYPE_P (t)) | |
3393 | *walk_subtrees = 0; | |
3394 | ||
3395 | /* We need to see the DECL_EXPR of NRVs before any other references so we | |
3396 | walk the body of BIND_EXPR before walking its variables. */ | |
3397 | else if (TREE_CODE (t) == BIND_EXPR) | |
3398 | walk_tree (&BIND_EXPR_BODY (t), finalize_nrv_unc_r, data, NULL); | |
3399 | ||
3400 | /* Change RETURN_EXPRs of NRVs to assign to the RESULT_DECL only the final | |
3401 | return value built by the allocator instead of the whole construct. */ | |
3402 | else if (TREE_CODE (t) == RETURN_EXPR | |
d864aeeb | 3403 | && TREE_CODE (TREE_OPERAND (t, 0)) == INIT_EXPR) |
088b91c7 EB |
3404 | { |
3405 | tree ret_val = TREE_OPERAND (TREE_OPERAND (t, 0), 1); | |
3406 | ||
3407 | /* This is the construct returned by the allocator. */ | |
3408 | if (TREE_CODE (ret_val) == COMPOUND_EXPR | |
3409 | && TREE_CODE (TREE_OPERAND (ret_val, 0)) == INIT_EXPR) | |
3410 | { | |
2117b9bb EB |
3411 | tree rhs = TREE_OPERAND (TREE_OPERAND (ret_val, 0), 1); |
3412 | ||
088b91c7 | 3413 | if (TYPE_IS_FAT_POINTER_P (TREE_TYPE (ret_val))) |
2117b9bb | 3414 | ret_val = CONSTRUCTOR_ELT (rhs, 1)->value; |
088b91c7 | 3415 | else |
2117b9bb | 3416 | ret_val = rhs; |
088b91c7 EB |
3417 | } |
3418 | ||
3419 | /* Strip useless conversions around the return value. */ | |
3420 | if (gnat_useless_type_conversion (ret_val) | |
3421 | || TREE_CODE (ret_val) == VIEW_CONVERT_EXPR) | |
3422 | ret_val = TREE_OPERAND (ret_val, 0); | |
3423 | ||
3424 | /* Strip unpadding around the return value. */ | |
3425 | if (TREE_CODE (ret_val) == COMPONENT_REF | |
3426 | && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (ret_val, 0)))) | |
3427 | ret_val = TREE_OPERAND (ret_val, 0); | |
3428 | ||
3429 | /* Assign the new return value to the RESULT_DECL. */ | |
3430 | if (is_nrv_p (dp->nrv, ret_val)) | |
3431 | TREE_OPERAND (TREE_OPERAND (t, 0), 1) | |
3432 | = TREE_OPERAND (DECL_INITIAL (ret_val), 0); | |
3433 | } | |
3434 | ||
3435 | /* Adjust the DECL_EXPR of NRVs to call the allocator and save the result | |
3436 | into a new variable. */ | |
3437 | else if (TREE_CODE (t) == DECL_EXPR | |
3438 | && is_nrv_p (dp->nrv, DECL_EXPR_DECL (t))) | |
3439 | { | |
3440 | tree saved_current_function_decl = current_function_decl; | |
3441 | tree var = DECL_EXPR_DECL (t); | |
3442 | tree alloc, p_array, new_var, new_ret; | |
9771b263 DN |
3443 | vec<constructor_elt, va_gc> *v; |
3444 | vec_alloc (v, 2); | |
088b91c7 EB |
3445 | |
3446 | /* Create an artificial context to build the allocation. */ | |
3447 | current_function_decl = decl_function_context (var); | |
3448 | start_stmt_group (); | |
3449 | gnat_pushlevel (); | |
3450 | ||
3451 | /* This will return a COMPOUND_EXPR with the allocation in the first | |
3452 | arm and the final return value in the second arm. */ | |
3453 | alloc = build_allocator (TREE_TYPE (var), DECL_INITIAL (var), | |
3454 | TREE_TYPE (dp->result), | |
3455 | Procedure_To_Call (dp->gnat_ret), | |
3456 | Storage_Pool (dp->gnat_ret), | |
3457 | Empty, false); | |
3458 | ||
3459 | /* The new variable is built as a reference to the allocated space. */ | |
3460 | new_var | |
3461 | = build_decl (DECL_SOURCE_LOCATION (var), VAR_DECL, DECL_NAME (var), | |
3462 | build_reference_type (TREE_TYPE (var))); | |
3463 | DECL_BY_REFERENCE (new_var) = 1; | |
3464 | ||
3465 | if (TYPE_IS_FAT_POINTER_P (TREE_TYPE (alloc))) | |
3466 | { | |
2117b9bb EB |
3467 | tree cst = TREE_OPERAND (alloc, 1); |
3468 | ||
088b91c7 EB |
3469 | /* The new initial value is a COMPOUND_EXPR with the allocation in |
3470 | the first arm and the value of P_ARRAY in the second arm. */ | |
3471 | DECL_INITIAL (new_var) | |
3472 | = build2 (COMPOUND_EXPR, TREE_TYPE (new_var), | |
3473 | TREE_OPERAND (alloc, 0), | |
2117b9bb | 3474 | CONSTRUCTOR_ELT (cst, 0)->value); |
088b91c7 EB |
3475 | |
3476 | /* Build a modified CONSTRUCTOR that references NEW_VAR. */ | |
3477 | p_array = TYPE_FIELDS (TREE_TYPE (alloc)); | |
3478 | CONSTRUCTOR_APPEND_ELT (v, p_array, | |
3479 | fold_convert (TREE_TYPE (p_array), new_var)); | |
3480 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (p_array), | |
2117b9bb | 3481 | CONSTRUCTOR_ELT (cst, 1)->value); |
088b91c7 EB |
3482 | new_ret = build_constructor (TREE_TYPE (alloc), v); |
3483 | } | |
3484 | else | |
3485 | { | |
3486 | /* The new initial value is just the allocation. */ | |
3487 | DECL_INITIAL (new_var) = alloc; | |
3488 | new_ret = fold_convert (TREE_TYPE (alloc), new_var); | |
3489 | } | |
3490 | ||
3491 | gnat_pushdecl (new_var, Empty); | |
3492 | ||
3493 | /* Destroy the artificial context and insert the new statements. */ | |
3494 | gnat_zaplevel (); | |
3495 | *tp = end_stmt_group (); | |
3496 | current_function_decl = saved_current_function_decl; | |
3497 | ||
3498 | /* Chain NEW_VAR immediately after VAR and ignore the latter. */ | |
3499 | DECL_CHAIN (new_var) = DECL_CHAIN (var); | |
3500 | DECL_CHAIN (var) = new_var; | |
3501 | DECL_IGNORED_P (var) = 1; | |
3502 | ||
3503 | /* Save the new return value and the dereference of NEW_VAR. */ | |
3504 | DECL_INITIAL (var) | |
3505 | = build2 (COMPOUND_EXPR, TREE_TYPE (var), new_ret, | |
3506 | build1 (INDIRECT_REF, TREE_TYPE (var), new_var)); | |
3507 | /* ??? Kludge to avoid messing up during inlining. */ | |
3508 | DECL_CONTEXT (var) = NULL_TREE; | |
3509 | } | |
3510 | ||
3511 | /* And replace all uses of NRVs with the dereference of NEW_VAR. */ | |
3512 | else if (is_nrv_p (dp->nrv, t)) | |
3513 | *tp = TREE_OPERAND (DECL_INITIAL (t), 1); | |
3514 | ||
3515 | /* Avoid walking into the same tree more than once. Unfortunately, we | |
3516 | can't just use walk_tree_without_duplicates because it would only | |
3517 | call us for the first occurrence of NRVs in the function body. */ | |
6e2830c3 | 3518 | if (dp->visited->add (*tp)) |
71196d4e EB |
3519 | *walk_subtrees = 0; |
3520 | ||
3521 | return NULL_TREE; | |
3522 | } | |
3523 | ||
3524 | /* Finalize the Named Return Value optimization for FNDECL. The NRV bitmap | |
3525 | contains the candidates for Named Return Value and OTHER is a list of | |
088b91c7 | 3526 | the other return values. GNAT_RET is a representative return node. */ |
71196d4e EB |
3527 | |
3528 | static void | |
9771b263 | 3529 | finalize_nrv (tree fndecl, bitmap nrv, vec<tree, va_gc> *other, Node_Id gnat_ret) |
71196d4e EB |
3530 | { |
3531 | struct cgraph_node *node; | |
3532 | struct nrv_data data; | |
088b91c7 | 3533 | walk_tree_fn func; |
71196d4e EB |
3534 | unsigned int i; |
3535 | tree iter; | |
3536 | ||
3537 | /* We shouldn't be applying the optimization to return types that we aren't | |
3538 | allowed to manipulate freely. */ | |
a0b8b1b7 | 3539 | gcc_assert (!TYPE_IS_BY_REFERENCE_P (TREE_TYPE (TREE_TYPE (fndecl)))); |
71196d4e EB |
3540 | |
3541 | /* Prune the candidates that are referenced by other return values. */ | |
3542 | data.nrv = nrv; | |
3543 | data.result = NULL_TREE; | |
547bbe49 | 3544 | data.gnat_ret = Empty; |
71196d4e | 3545 | data.visited = NULL; |
547bbe49 | 3546 | FOR_EACH_VEC_SAFE_ELT (other, i, iter) |
71196d4e EB |
3547 | walk_tree_without_duplicates (&iter, prune_nrv_r, &data); |
3548 | if (bitmap_empty_p (nrv)) | |
3549 | return; | |
3550 | ||
3551 | /* Prune also the candidates that are referenced by nested functions. */ | |
037e5573 | 3552 | node = cgraph_node::get_create (fndecl); |
71196d4e | 3553 | for (node = node->nested; node; node = node->next_nested) |
67348ccc | 3554 | walk_tree_without_duplicates (&DECL_SAVED_TREE (node->decl), prune_nrv_r, |
71196d4e EB |
3555 | &data); |
3556 | if (bitmap_empty_p (nrv)) | |
3557 | return; | |
3558 | ||
3559 | /* Extract a set of NRVs with non-overlapping live ranges. */ | |
3560 | if (!prune_nrv_in_block (nrv, DECL_INITIAL (fndecl))) | |
3561 | return; | |
3562 | ||
3563 | /* Adjust the relevant RETURN_EXPRs and replace the occurrences of NRVs. */ | |
3564 | data.nrv = nrv; | |
3565 | data.result = DECL_RESULT (fndecl); | |
088b91c7 | 3566 | data.gnat_ret = gnat_ret; |
6e2830c3 | 3567 | data.visited = new hash_set<tree>; |
088b91c7 EB |
3568 | if (TYPE_RETURN_UNCONSTRAINED_P (TREE_TYPE (fndecl))) |
3569 | func = finalize_nrv_unc_r; | |
3570 | else | |
3571 | func = finalize_nrv_r; | |
3572 | walk_tree (&DECL_SAVED_TREE (fndecl), func, &data, NULL); | |
6e2830c3 | 3573 | delete data.visited; |
71196d4e EB |
3574 | } |
3575 | ||
3576 | /* Return true if RET_VAL can be used as a Named Return Value for the | |
3577 | anonymous return object RET_OBJ. */ | |
3578 | ||
3579 | static bool | |
3580 | return_value_ok_for_nrv_p (tree ret_obj, tree ret_val) | |
3581 | { | |
3582 | if (TREE_CODE (ret_val) != VAR_DECL) | |
3583 | return false; | |
3584 | ||
3585 | if (TREE_THIS_VOLATILE (ret_val)) | |
3586 | return false; | |
3587 | ||
3588 | if (DECL_CONTEXT (ret_val) != current_function_decl) | |
3589 | return false; | |
3590 | ||
3591 | if (TREE_STATIC (ret_val)) | |
3592 | return false; | |
3593 | ||
3594 | if (TREE_ADDRESSABLE (ret_val)) | |
3595 | return false; | |
3596 | ||
088b91c7 | 3597 | if (ret_obj && DECL_ALIGN (ret_val) > DECL_ALIGN (ret_obj)) |
71196d4e EB |
3598 | return false; |
3599 | ||
3600 | return true; | |
3601 | } | |
3602 | ||
3603 | /* Build a RETURN_EXPR. If RET_VAL is non-null, build a RETURN_EXPR around | |
3604 | the assignment of RET_VAL to RET_OBJ. Otherwise build a bare RETURN_EXPR | |
3605 | around RESULT_OBJ, which may be null in this case. */ | |
f3d34576 EB |
3606 | |
3607 | static tree | |
3608 | build_return_expr (tree ret_obj, tree ret_val) | |
3609 | { | |
3610 | tree result_expr; | |
3611 | ||
3612 | if (ret_val) | |
3613 | { | |
3614 | /* The gimplifier explicitly enforces the following invariant: | |
3615 | ||
3616 | RETURN_EXPR | |
3617 | | | |
d864aeeb | 3618 | INIT_EXPR |
f3d34576 EB |
3619 | / \ |
3620 | / \ | |
3621 | RET_OBJ ... | |
3622 | ||
3623 | As a consequence, type consistency dictates that we use the type | |
3624 | of the RET_OBJ as the operation type. */ | |
3625 | tree operation_type = TREE_TYPE (ret_obj); | |
3626 | ||
d864aeeb EB |
3627 | /* Convert the right operand to the operation type. Note that this is |
3628 | the transformation applied in the INIT_EXPR case of build_binary_op, | |
f3d34576 EB |
3629 | with the assumption that the type cannot involve a placeholder. */ |
3630 | if (operation_type != TREE_TYPE (ret_val)) | |
3631 | ret_val = convert (operation_type, ret_val); | |
3632 | ||
d864aeeb EB |
3633 | /* We always can use an INIT_EXPR for the return object. */ |
3634 | result_expr = build2 (INIT_EXPR, void_type_node, ret_obj, ret_val); | |
71196d4e EB |
3635 | |
3636 | /* If the function returns an aggregate type, find out whether this is | |
3637 | a candidate for Named Return Value. If so, record it. Otherwise, | |
3638 | if this is an expression of some kind, record it elsewhere. */ | |
3639 | if (optimize | |
3640 | && AGGREGATE_TYPE_P (operation_type) | |
3641 | && !TYPE_IS_FAT_POINTER_P (operation_type) | |
f563ce55 | 3642 | && TYPE_MODE (operation_type) == BLKmode |
71196d4e EB |
3643 | && aggregate_value_p (operation_type, current_function_decl)) |
3644 | { | |
71196d4e EB |
3645 | /* Strip useless conversions around the return value. */ |
3646 | if (gnat_useless_type_conversion (ret_val)) | |
3647 | ret_val = TREE_OPERAND (ret_val, 0); | |
3648 | ||
3649 | /* Now apply the test to the return value. */ | |
3650 | if (return_value_ok_for_nrv_p (ret_obj, ret_val)) | |
3651 | { | |
3652 | if (!f_named_ret_val) | |
3653 | f_named_ret_val = BITMAP_GGC_ALLOC (); | |
3654 | bitmap_set_bit (f_named_ret_val, DECL_UID (ret_val)); | |
3655 | } | |
3656 | ||
3657 | /* Note that we need not care about CONSTRUCTORs here, as they are | |
3658 | totally transparent given the read-compose-write semantics of | |
3659 | assignments from CONSTRUCTORs. */ | |
3660 | else if (EXPR_P (ret_val)) | |
9771b263 | 3661 | vec_safe_push (f_other_ret_val, ret_val); |
71196d4e | 3662 | } |
f3d34576 EB |
3663 | } |
3664 | else | |
3665 | result_expr = ret_obj; | |
3666 | ||
3667 | return build1 (RETURN_EXPR, void_type_node, result_expr); | |
3668 | } | |
a1ab4c31 AC |
3669 | \f |
3670 | /* Subroutine of gnat_to_gnu to process gnat_node, an N_Subprogram_Body. We | |
3671 | don't return anything. */ | |
3672 | ||
3673 | static void | |
3674 | Subprogram_Body_to_gnu (Node_Id gnat_node) | |
3675 | { | |
3676 | /* Defining identifier of a parameter to the subprogram. */ | |
3677 | Entity_Id gnat_param; | |
3678 | /* The defining identifier for the subprogram body. Note that if a | |
3679 | specification has appeared before for this body, then the identifier | |
3680 | occurring in that specification will also be a defining identifier and all | |
3681 | the calls to this subprogram will point to that specification. */ | |
3682 | Entity_Id gnat_subprog_id | |
3683 | = (Present (Corresponding_Spec (gnat_node)) | |
3684 | ? Corresponding_Spec (gnat_node) : Defining_Entity (gnat_node)); | |
3685 | /* The FUNCTION_DECL node corresponding to the subprogram spec. */ | |
3686 | tree gnu_subprog_decl; | |
d47d0a8d EB |
3687 | /* Its RESULT_DECL node. */ |
3688 | tree gnu_result_decl; | |
35a382b8 | 3689 | /* Its FUNCTION_TYPE node. */ |
a1ab4c31 | 3690 | tree gnu_subprog_type; |
35a382b8 | 3691 | /* The TYPE_CI_CO_LIST of its FUNCTION_TYPE node, if any. */ |
a1ab4c31 | 3692 | tree gnu_cico_list; |
35a382b8 EB |
3693 | /* The entry in the CI_CO_LIST that represents a function return, if any. */ |
3694 | tree gnu_return_var_elmt = NULL_TREE; | |
a1ab4c31 | 3695 | tree gnu_result; |
40e63ada | 3696 | location_t locus; |
f3d34576 | 3697 | struct language_function *gnu_subprog_language; |
9771b263 | 3698 | vec<parm_attr, va_gc> *cache; |
a1ab4c31 AC |
3699 | |
3700 | /* If this is a generic object or if it has been eliminated, | |
3701 | ignore it. */ | |
3702 | if (Ekind (gnat_subprog_id) == E_Generic_Procedure | |
3703 | || Ekind (gnat_subprog_id) == E_Generic_Function | |
3704 | || Is_Eliminated (gnat_subprog_id)) | |
3705 | return; | |
3706 | ||
3707 | /* If this subprogram acts as its own spec, define it. Otherwise, just get | |
3708 | the already-elaborated tree node. However, if this subprogram had its | |
3709 | elaboration deferred, we will already have made a tree node for it. So | |
3710 | treat it as not being defined in that case. Such a subprogram cannot | |
3711 | have an address clause or a freeze node, so this test is safe, though it | |
3712 | does disable some otherwise-useful error checking. */ | |
3713 | gnu_subprog_decl | |
3714 | = gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE, | |
3715 | Acts_As_Spec (gnat_node) | |
3716 | && !present_gnu_tree (gnat_subprog_id)); | |
d47d0a8d | 3717 | gnu_result_decl = DECL_RESULT (gnu_subprog_decl); |
a1ab4c31 | 3718 | gnu_subprog_type = TREE_TYPE (gnu_subprog_decl); |
35a382b8 | 3719 | gnu_cico_list = TYPE_CI_CO_LIST (gnu_subprog_type); |
2374257a EB |
3720 | if (gnu_cico_list && TREE_VALUE (gnu_cico_list) == void_type_node) |
3721 | gnu_return_var_elmt = gnu_cico_list; | |
a1ab4c31 | 3722 | |
d47d0a8d | 3723 | /* If the function returns by invisible reference, make it explicit in the |
2374257a EB |
3724 | function body. See gnat_to_gnu_entity, E_Subprogram_Type case. */ |
3725 | if (TREE_ADDRESSABLE (gnu_subprog_type)) | |
d47d0a8d EB |
3726 | { |
3727 | TREE_TYPE (gnu_result_decl) | |
3728 | = build_reference_type (TREE_TYPE (gnu_result_decl)); | |
3729 | relayout_decl (gnu_result_decl); | |
3730 | } | |
3731 | ||
40e63ada EB |
3732 | /* Set the line number in the decl to correspond to that of the body. */ |
3733 | Sloc_to_locus (Sloc (gnat_node), &locus); | |
3734 | DECL_SOURCE_LOCATION (gnu_subprog_decl) = locus; | |
a1ab4c31 AC |
3735 | |
3736 | /* Initialize the information structure for the function. */ | |
3737 | allocate_struct_function (gnu_subprog_decl, false); | |
766090c2 | 3738 | gnu_subprog_language = ggc_cleared_alloc<language_function> (); |
f3d34576 | 3739 | DECL_STRUCT_FUNCTION (gnu_subprog_decl)->language = gnu_subprog_language; |
40e63ada | 3740 | DECL_STRUCT_FUNCTION (gnu_subprog_decl)->function_start_locus = locus; |
58c8f770 | 3741 | set_cfun (NULL); |
a1ab4c31 AC |
3742 | |
3743 | begin_subprog_body (gnu_subprog_decl); | |
a1ab4c31 | 3744 | |
2374257a EB |
3745 | /* If there are copy-in/copy-out parameters, we need to ensure that they are |
3746 | properly copied out by the return statement. We do this by making a new | |
3747 | block and converting any return into a goto to a label at the end of the | |
3748 | block. */ | |
a963da4d EB |
3749 | if (gnu_cico_list) |
3750 | { | |
35a382b8 EB |
3751 | tree gnu_return_var = NULL_TREE; |
3752 | ||
b16b6cc9 | 3753 | vec_safe_push (gnu_return_label_stack, |
a963da4d EB |
3754 | create_artificial_label (input_location)); |
3755 | ||
3756 | start_stmt_group (); | |
3757 | gnat_pushlevel (); | |
3758 | ||
2374257a EB |
3759 | /* If this is a function with copy-in/copy-out parameters and which does |
3760 | not return by invisible reference, we also need a variable for the | |
3761 | return value to be placed. */ | |
3762 | if (gnu_return_var_elmt && !TREE_ADDRESSABLE (gnu_subprog_type)) | |
35a382b8 EB |
3763 | { |
3764 | tree gnu_return_type | |
3765 | = TREE_TYPE (TREE_PURPOSE (gnu_return_var_elmt)); | |
3766 | ||
35a382b8 EB |
3767 | gnu_return_var |
3768 | = create_var_decl (get_identifier ("RETVAL"), NULL_TREE, | |
2056c5ed EB |
3769 | gnu_return_type, NULL_TREE, |
3770 | false, false, false, false, false, | |
3771 | true, false, NULL, gnat_subprog_id); | |
35a382b8 EB |
3772 | TREE_VALUE (gnu_return_var_elmt) = gnu_return_var; |
3773 | } | |
3774 | ||
9771b263 | 3775 | vec_safe_push (gnu_return_var_stack, gnu_return_var); |
35a382b8 | 3776 | |
a963da4d EB |
3777 | /* See whether there are parameters for which we don't have a GCC tree |
3778 | yet. These must be Out parameters. Make a VAR_DECL for them and | |
3779 | put it into TYPE_CI_CO_LIST, which must contain an empty entry too. | |
3780 | We can match up the entries because TYPE_CI_CO_LIST is in the order | |
3781 | of the parameters. */ | |
3782 | for (gnat_param = First_Formal_With_Extras (gnat_subprog_id); | |
3783 | Present (gnat_param); | |
3784 | gnat_param = Next_Formal_With_Extras (gnat_param)) | |
3785 | if (!present_gnu_tree (gnat_param)) | |
3786 | { | |
3787 | tree gnu_cico_entry = gnu_cico_list; | |
54625ca1 | 3788 | tree gnu_decl; |
a963da4d EB |
3789 | |
3790 | /* Skip any entries that have been already filled in; they must | |
3791 | correspond to In Out parameters. */ | |
3792 | while (gnu_cico_entry && TREE_VALUE (gnu_cico_entry)) | |
3793 | gnu_cico_entry = TREE_CHAIN (gnu_cico_entry); | |
3794 | ||
54625ca1 | 3795 | /* Do any needed dereferences for by-ref objects. */ |
afc737f0 | 3796 | gnu_decl = gnat_to_gnu_entity (gnat_param, NULL_TREE, true); |
54625ca1 EB |
3797 | gcc_assert (DECL_P (gnu_decl)); |
3798 | if (DECL_BY_REF_P (gnu_decl)) | |
3799 | gnu_decl = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_decl); | |
3800 | ||
a963da4d EB |
3801 | /* Do any needed references for padded types. */ |
3802 | TREE_VALUE (gnu_cico_entry) | |
54625ca1 | 3803 | = convert (TREE_TYPE (TREE_PURPOSE (gnu_cico_entry)), gnu_decl); |
a963da4d EB |
3804 | } |
3805 | } | |
3806 | else | |
9771b263 | 3807 | vec_safe_push (gnu_return_label_stack, NULL_TREE); |
a1ab4c31 AC |
3808 | |
3809 | /* Get a tree corresponding to the code for the subprogram. */ | |
3810 | start_stmt_group (); | |
3811 | gnat_pushlevel (); | |
3812 | ||
a1ab4c31 AC |
3813 | process_decls (Declarations (gnat_node), Empty, Empty, true, true); |
3814 | ||
3815 | /* Generate the code of the subprogram itself. A return statement will be | |
3816 | present and any Out parameters will be handled there. */ | |
3817 | add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node))); | |
3818 | gnat_poplevel (); | |
3819 | gnu_result = end_stmt_group (); | |
3820 | ||
0394741f EB |
3821 | /* If we populated the parameter attributes cache, we need to make sure that |
3822 | the cached expressions are evaluated on all the possible paths leading to | |
3823 | their uses. So we force their evaluation on entry of the function. */ | |
f3d34576 | 3824 | cache = gnu_subprog_language->parm_attr_cache; |
0394741f EB |
3825 | if (cache) |
3826 | { | |
3827 | struct parm_attr_d *pa; | |
3828 | int i; | |
3829 | ||
3830 | start_stmt_group (); | |
3831 | ||
9771b263 | 3832 | FOR_EACH_VEC_ELT (*cache, i, pa) |
0394741f EB |
3833 | { |
3834 | if (pa->first) | |
3835 | add_stmt_with_node_force (pa->first, gnat_node); | |
3836 | if (pa->last) | |
3837 | add_stmt_with_node_force (pa->last, gnat_node); | |
3838 | if (pa->length) | |
3839 | add_stmt_with_node_force (pa->length, gnat_node); | |
3840 | } | |
3841 | ||
3842 | add_stmt (gnu_result); | |
3843 | gnu_result = end_stmt_group (); | |
f3d34576 EB |
3844 | |
3845 | gnu_subprog_language->parm_attr_cache = NULL; | |
0394741f EB |
3846 | } |
3847 | ||
a963da4d EB |
3848 | /* If we are dealing with a return from an Ada procedure with parameters |
3849 | passed by copy-in/copy-out, we need to return a record containing the | |
3850 | final values of these parameters. If the list contains only one entry, | |
3851 | return just that entry though. | |
3852 | ||
3853 | For a full description of the copy-in/copy-out parameter mechanism, see | |
3854 | the part of the gnat_to_gnu_entity routine dealing with the translation | |
3855 | of subprograms. | |
3856 | ||
3857 | We need to make a block that contains the definition of that label and | |
3858 | the copying of the return value. It first contains the function, then | |
3859 | the label and copy statement. */ | |
3860 | if (gnu_cico_list) | |
3861 | { | |
2374257a EB |
3862 | const Node_Id gnat_end_label |
3863 | = End_Label (Handled_Statement_Sequence (gnat_node)); | |
a963da4d | 3864 | |
df2abf54 EB |
3865 | gnu_return_var_stack->pop (); |
3866 | ||
a963da4d EB |
3867 | add_stmt (gnu_result); |
3868 | add_stmt (build1 (LABEL_EXPR, void_type_node, | |
9771b263 | 3869 | gnu_return_label_stack->last ())); |
a963da4d | 3870 | |
2374257a EB |
3871 | /* If this is a function which returns by invisible reference, the |
3872 | return value has already been dealt with at the return statements, | |
3873 | so we only need to indirectly copy out the parameters. */ | |
3874 | if (TREE_ADDRESSABLE (gnu_subprog_type)) | |
3875 | { | |
3876 | tree gnu_ret_deref | |
3877 | = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result_decl); | |
3878 | tree t; | |
3879 | ||
3880 | gcc_assert (TREE_VALUE (gnu_cico_list) == void_type_node); | |
3881 | ||
3882 | for (t = TREE_CHAIN (gnu_cico_list); t; t = TREE_CHAIN (t)) | |
3883 | { | |
3884 | tree gnu_field_deref | |
64235766 | 3885 | = build_component_ref (gnu_ret_deref, TREE_PURPOSE (t), true); |
2374257a EB |
3886 | gnu_result = build2 (MODIFY_EXPR, void_type_node, |
3887 | gnu_field_deref, TREE_VALUE (t)); | |
3888 | add_stmt_with_node (gnu_result, gnat_end_label); | |
3889 | } | |
3890 | } | |
3891 | ||
3892 | /* Otherwise, if this is a procedure or a function which does not return | |
3893 | by invisible reference, we can do a direct block-copy out. */ | |
a963da4d | 3894 | else |
2374257a EB |
3895 | { |
3896 | tree gnu_retval; | |
3897 | ||
3898 | if (list_length (gnu_cico_list) == 1) | |
3899 | gnu_retval = TREE_VALUE (gnu_cico_list); | |
3900 | else | |
3901 | gnu_retval | |
3902 | = build_constructor_from_list (TREE_TYPE (gnu_subprog_type), | |
3903 | gnu_cico_list); | |
3904 | ||
3905 | gnu_result = build_return_expr (gnu_result_decl, gnu_retval); | |
3906 | add_stmt_with_node (gnu_result, gnat_end_label); | |
3907 | } | |
a963da4d | 3908 | |
a963da4d EB |
3909 | gnat_poplevel (); |
3910 | gnu_result = end_stmt_group (); | |
3911 | } | |
3912 | ||
9771b263 | 3913 | gnu_return_label_stack->pop (); |
a963da4d | 3914 | |
2a02d090 OH |
3915 | /* Attempt setting the end_locus of our GCC body tree, typically a |
3916 | BIND_EXPR or STATEMENT_LIST, then the end_locus of our GCC subprogram | |
3917 | declaration tree. */ | |
3918 | set_end_locus_from_node (gnu_result, gnat_node); | |
3919 | set_end_locus_from_node (gnu_subprog_decl, gnat_node); | |
3920 | ||
48a24fcf TG |
3921 | /* On SEH targets, install an exception handler around the main entry |
3922 | point to catch unhandled exceptions. */ | |
3923 | if (DECL_NAME (gnu_subprog_decl) == main_identifier_node | |
3924 | && targetm_common.except_unwind_info (&global_options) == UI_SEH) | |
3925 | { | |
3926 | tree t; | |
3927 | tree etype; | |
3928 | ||
3929 | t = build_call_expr (builtin_decl_explicit (BUILT_IN_EH_POINTER), | |
3930 | 1, integer_zero_node); | |
3931 | t = build_call_n_expr (unhandled_except_decl, 1, t); | |
3932 | ||
3933 | etype = build_unary_op (ADDR_EXPR, NULL_TREE, unhandled_others_decl); | |
3934 | etype = tree_cons (NULL_TREE, etype, NULL_TREE); | |
3935 | ||
3936 | t = build2 (CATCH_EXPR, void_type_node, etype, t); | |
3937 | gnu_result = build2 (TRY_CATCH_EXPR, TREE_TYPE (gnu_result), | |
3938 | gnu_result, t); | |
3939 | } | |
3940 | ||
f3d34576 EB |
3941 | end_subprog_body (gnu_result); |
3942 | ||
f4cd2542 EB |
3943 | /* Finally annotate the parameters and disconnect the trees for parameters |
3944 | that we have turned into variables since they are now unusable. */ | |
a1ab4c31 AC |
3945 | for (gnat_param = First_Formal_With_Extras (gnat_subprog_id); |
3946 | Present (gnat_param); | |
3947 | gnat_param = Next_Formal_With_Extras (gnat_param)) | |
f4cd2542 EB |
3948 | { |
3949 | tree gnu_param = get_gnu_tree (gnat_param); | |
0c700259 EB |
3950 | bool is_var_decl = (TREE_CODE (gnu_param) == VAR_DECL); |
3951 | ||
f4cd2542 | 3952 | annotate_object (gnat_param, TREE_TYPE (gnu_param), NULL_TREE, |
491f54a7 | 3953 | DECL_BY_REF_P (gnu_param)); |
0c700259 EB |
3954 | |
3955 | if (is_var_decl) | |
f4cd2542 EB |
3956 | save_gnu_tree (gnat_param, NULL_TREE, false); |
3957 | } | |
a1ab4c31 | 3958 | |
0d24bf76 | 3959 | /* Disconnect the variable created for the return value. */ |
35a382b8 EB |
3960 | if (gnu_return_var_elmt) |
3961 | TREE_VALUE (gnu_return_var_elmt) = void_type_node; | |
3962 | ||
71196d4e EB |
3963 | /* If the function returns an aggregate type and we have candidates for |
3964 | a Named Return Value, finalize the optimization. */ | |
3965 | if (optimize && gnu_subprog_language->named_ret_val) | |
3966 | { | |
088b91c7 EB |
3967 | finalize_nrv (gnu_subprog_decl, |
3968 | gnu_subprog_language->named_ret_val, | |
3969 | gnu_subprog_language->other_ret_val, | |
3970 | gnu_subprog_language->gnat_ret); | |
71196d4e EB |
3971 | gnu_subprog_language->named_ret_val = NULL; |
3972 | gnu_subprog_language->other_ret_val = NULL; | |
3973 | } | |
3974 | ||
87411e95 EB |
3975 | /* If this is an inlined external function that has been marked uninlinable, |
3976 | drop the body and stop there. Otherwise compile the body. */ | |
3977 | if (DECL_EXTERNAL (gnu_subprog_decl) && DECL_UNINLINABLE (gnu_subprog_decl)) | |
3978 | DECL_SAVED_TREE (gnu_subprog_decl) = NULL_TREE; | |
3979 | else | |
3980 | rest_of_subprog_body_compilation (gnu_subprog_decl); | |
a1ab4c31 AC |
3981 | } |
3982 | \f | |
f797c2b7 | 3983 | /* Return true if GNAT_NODE references an Atomic entity. */ |
033ba5bf EB |
3984 | |
3985 | static bool | |
f797c2b7 | 3986 | node_is_atomic (Node_Id gnat_node) |
033ba5bf | 3987 | { |
f797c2b7 | 3988 | Entity_Id gnat_entity; |
033ba5bf | 3989 | |
f797c2b7 | 3990 | switch (Nkind (gnat_node)) |
033ba5bf | 3991 | { |
f797c2b7 EB |
3992 | case N_Identifier: |
3993 | case N_Expanded_Name: | |
3994 | gnat_entity = Entity (gnat_node); | |
3995 | if (Ekind (gnat_entity) != E_Variable) | |
3996 | break; | |
3997 | return Is_Atomic (gnat_entity) || Is_Atomic (Etype (gnat_entity)); | |
3998 | ||
3999 | case N_Selected_Component: | |
4000 | gnat_entity = Entity (Selector_Name (gnat_node)); | |
4001 | return Is_Atomic (gnat_entity) || Is_Atomic (Etype (gnat_entity)); | |
4002 | ||
4003 | case N_Indexed_Component: | |
4004 | if (Has_Atomic_Components (Etype (Prefix (gnat_node)))) | |
4005 | return true; | |
e2f0522e EB |
4006 | if (Is_Entity_Name (Prefix (gnat_node)) |
4007 | && Has_Atomic_Components (Entity (Prefix (gnat_node)))) | |
4008 | return true; | |
f797c2b7 EB |
4009 | |
4010 | /* ... fall through ... */ | |
4011 | ||
4012 | case N_Explicit_Dereference: | |
4013 | return Is_Atomic (Etype (gnat_node)); | |
4014 | ||
4015 | default: | |
4016 | break; | |
033ba5bf EB |
4017 | } |
4018 | ||
f797c2b7 EB |
4019 | return false; |
4020 | } | |
4021 | ||
4022 | /* Return true if GNAT_NODE references a Volatile_Full_Access entity. */ | |
4023 | ||
4024 | static bool | |
4025 | node_has_volatile_full_access (Node_Id gnat_node) | |
4026 | { | |
4027 | Entity_Id gnat_entity; | |
4028 | ||
4029 | switch (Nkind (gnat_node)) | |
033ba5bf | 4030 | { |
033ba5bf | 4031 | case N_Identifier: |
f797c2b7 EB |
4032 | case N_Expanded_Name: |
4033 | gnat_entity = Entity (gnat_node); | |
4034 | if (Ekind (gnat_entity) != E_Variable) | |
4035 | break; | |
4036 | return Is_Volatile_Full_Access (gnat_entity) | |
4037 | || Is_Volatile_Full_Access (Etype (gnat_entity)); | |
4038 | ||
033ba5bf | 4039 | case N_Selected_Component: |
f797c2b7 EB |
4040 | gnat_entity = Entity (Selector_Name (gnat_node)); |
4041 | return Is_Volatile_Full_Access (gnat_entity) | |
4042 | || Is_Volatile_Full_Access (Etype (gnat_entity)); | |
4043 | ||
4044 | case N_Indexed_Component: | |
4045 | case N_Explicit_Dereference: | |
4046 | return Is_Volatile_Full_Access (Etype (gnat_node)); | |
033ba5bf EB |
4047 | |
4048 | default: | |
f797c2b7 | 4049 | break; |
033ba5bf EB |
4050 | } |
4051 | ||
f797c2b7 EB |
4052 | return false; |
4053 | } | |
4054 | ||
4055 | /* Strip any type conversion on GNAT_NODE and return the result. */ | |
4056 | ||
4057 | static Node_Id | |
4058 | gnat_strip_type_conversion (Node_Id gnat_node) | |
4059 | { | |
4060 | Node_Kind kind = Nkind (gnat_node); | |
4061 | ||
4062 | if (kind == N_Type_Conversion || kind == N_Unchecked_Type_Conversion) | |
4063 | gnat_node = Expression (gnat_node); | |
4064 | ||
4065 | return gnat_node; | |
4066 | } | |
4067 | ||
4068 | /* Return true if GNAT_NODE requires outer atomic access, i.e. atomic access | |
4069 | of an object of which GNAT_NODE is a component. */ | |
4070 | ||
4071 | static bool | |
4072 | outer_atomic_access_required_p (Node_Id gnat_node) | |
4073 | { | |
4074 | gnat_node = gnat_strip_type_conversion (gnat_node); | |
4075 | ||
241125b2 | 4076 | while (true) |
f797c2b7 | 4077 | { |
241125b2 EB |
4078 | switch (Nkind (gnat_node)) |
4079 | { | |
4080 | case N_Identifier: | |
4081 | case N_Expanded_Name: | |
4082 | if (No (Renamed_Object (Entity (gnat_node)))) | |
4083 | return false; | |
4084 | gnat_node | |
4085 | = gnat_strip_type_conversion (Renamed_Object (Entity (gnat_node))); | |
4086 | break; | |
4087 | ||
4088 | case N_Indexed_Component: | |
4089 | case N_Selected_Component: | |
4090 | case N_Slice: | |
4091 | gnat_node = gnat_strip_type_conversion (Prefix (gnat_node)); | |
4092 | if (node_has_volatile_full_access (gnat_node)) | |
4093 | return true; | |
4094 | break; | |
4095 | ||
4096 | default: | |
4097 | return false; | |
4098 | } | |
f797c2b7 EB |
4099 | } |
4100 | ||
241125b2 | 4101 | gcc_unreachable (); |
f797c2b7 EB |
4102 | } |
4103 | ||
4104 | /* Return true if GNAT_NODE requires atomic access and set SYNC according to | |
4105 | the associated synchronization setting. */ | |
4106 | ||
4107 | static bool | |
4108 | atomic_access_required_p (Node_Id gnat_node, bool *sync) | |
4109 | { | |
4110 | const Node_Id gnat_parent = Parent (gnat_node); | |
4111 | unsigned char attr_id; | |
4112 | bool as_a_whole = true; | |
4113 | ||
4114 | /* First, scan the parent to find out cases where the flag is irrelevant. */ | |
4115 | switch (Nkind (gnat_parent)) | |
033ba5bf EB |
4116 | { |
4117 | case N_Attribute_Reference: | |
4118 | attr_id = Get_Attribute_Id (Attribute_Name (gnat_parent)); | |
4119 | /* Do not mess up machine code insertions. */ | |
4120 | if (attr_id == Attr_Asm_Input || attr_id == Attr_Asm_Output) | |
4121 | return false; | |
f797c2b7 EB |
4122 | |
4123 | /* Nothing to do if we are the prefix of an attribute, since we do not | |
4124 | want an atomic access for things like 'Size. */ | |
4125 | ||
4126 | /* ... fall through ... */ | |
4127 | ||
4128 | case N_Reference: | |
4129 | /* The N_Reference node is like an attribute. */ | |
4130 | if (Prefix (gnat_parent) == gnat_node) | |
4131 | return false; | |
4132 | break; | |
4133 | ||
4134 | case N_Indexed_Component: | |
4135 | case N_Selected_Component: | |
4136 | case N_Slice: | |
4137 | /* If we are the prefix, then the access is only partial. */ | |
4138 | if (Prefix (gnat_parent) == gnat_node) | |
4139 | as_a_whole = false; | |
033ba5bf EB |
4140 | break; |
4141 | ||
4142 | case N_Object_Renaming_Declaration: | |
f797c2b7 EB |
4143 | /* Nothing to do for the identifier in an object renaming declaration, |
4144 | the renaming itself does not need atomic access. */ | |
033ba5bf EB |
4145 | return false; |
4146 | ||
4147 | default: | |
4148 | break; | |
4149 | } | |
4150 | ||
f797c2b7 EB |
4151 | /* Then, scan the node to find the atomic object. */ |
4152 | gnat_node = gnat_strip_type_conversion (gnat_node); | |
4153 | ||
4154 | /* For Atomic itself, only reads and updates of the object as a whole require | |
4155 | atomic access (RM C.6 (15)). But for Volatile_Full_Access, all reads and | |
4156 | updates require atomic access. */ | |
4157 | if (!(as_a_whole && node_is_atomic (gnat_node)) | |
4158 | && !node_has_volatile_full_access (gnat_node)) | |
4159 | return false; | |
4160 | ||
4161 | /* If an outer atomic access will also be required, it cancels this one. */ | |
4162 | if (outer_atomic_access_required_p (gnat_node)) | |
4163 | return false; | |
4164 | ||
4165 | *sync = Atomic_Sync_Required (gnat_node); | |
4166 | ||
033ba5bf EB |
4167 | return true; |
4168 | } | |
4169 | \f | |
ddb5a105 EB |
4170 | /* Create a temporary variable with PREFIX and TYPE, and return it. */ |
4171 | ||
4172 | static tree | |
4173 | create_temporary (const char *prefix, tree type) | |
4174 | { | |
2056c5ed EB |
4175 | tree gnu_temp |
4176 | = create_var_decl (create_tmp_var_name (prefix), NULL_TREE, | |
4177 | type, NULL_TREE, | |
4178 | false, false, false, false, false, | |
4179 | true, false, NULL, Empty); | |
ddb5a105 EB |
4180 | return gnu_temp; |
4181 | } | |
35a382b8 EB |
4182 | |
4183 | /* Create a temporary variable with PREFIX and initialize it with GNU_INIT. | |
4184 | Put the initialization statement into GNU_INIT_STMT and annotate it with | |
4185 | the SLOC of GNAT_NODE. Return the temporary variable. */ | |
4186 | ||
4187 | static tree | |
4188 | create_init_temporary (const char *prefix, tree gnu_init, tree *gnu_init_stmt, | |
4189 | Node_Id gnat_node) | |
4190 | { | |
ddb5a105 | 4191 | tree gnu_temp = create_temporary (prefix, TREE_TYPE (gnu_init)); |
35a382b8 EB |
4192 | |
4193 | *gnu_init_stmt = build_binary_op (INIT_EXPR, NULL_TREE, gnu_temp, gnu_init); | |
4194 | set_expr_location_from_node (*gnu_init_stmt, gnat_node); | |
4195 | ||
4196 | return gnu_temp; | |
4197 | } | |
4198 | ||
a1ab4c31 AC |
4199 | /* Subroutine of gnat_to_gnu to translate gnat_node, either an N_Function_Call |
4200 | or an N_Procedure_Call_Statement, to a GCC tree, which is returned. | |
4201 | GNU_RESULT_TYPE_P is a pointer to where we should place the result type. | |
0b3467c4 | 4202 | If GNU_TARGET is non-null, this must be a function call on the RHS of a |
033ba5bf | 4203 | N_Assignment_Statement and the result is to be placed into that object. |
f797c2b7 EB |
4204 | If OUTER_ATOMIC_ACCESS is true, then the assignment to GNU_TARGET must be a |
4205 | load-modify-store sequence. Otherwise, if ATOMIC_ACCESS is true, then the | |
4206 | assignment to GNU_TARGET must be atomic. If, in addition, ATOMIC_SYNC is | |
4207 | true, then the assignment to GNU_TARGET requires atomic synchronization. */ | |
a1ab4c31 AC |
4208 | |
4209 | static tree | |
80096613 | 4210 | Call_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p, tree gnu_target, |
f797c2b7 | 4211 | bool outer_atomic_access, bool atomic_access, bool atomic_sync) |
a1ab4c31 | 4212 | { |
ddb5a105 EB |
4213 | const bool function_call = (Nkind (gnat_node) == N_Function_Call); |
4214 | const bool returning_value = (function_call && !gnu_target); | |
a1ab4c31 AC |
4215 | /* The GCC node corresponding to the GNAT subprogram name. This can either |
4216 | be a FUNCTION_DECL node if we are dealing with a standard subprogram call, | |
4217 | or an indirect reference expression (an INDIRECT_REF node) pointing to a | |
4218 | subprogram. */ | |
ced57283 | 4219 | tree gnu_subprog = gnat_to_gnu (Name (gnat_node)); |
a1ab4c31 | 4220 | /* The FUNCTION_TYPE node giving the GCC type of the subprogram. */ |
ced57283 | 4221 | tree gnu_subprog_type = TREE_TYPE (gnu_subprog); |
ddb5a105 EB |
4222 | /* The return type of the FUNCTION_TYPE. */ |
4223 | tree gnu_result_type = TREE_TYPE (gnu_subprog_type); | |
ced57283 | 4224 | tree gnu_subprog_addr = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_subprog); |
9771b263 | 4225 | vec<tree, va_gc> *gnu_actual_vec = NULL; |
a1ab4c31 | 4226 | tree gnu_name_list = NULL_TREE; |
ddb5a105 | 4227 | tree gnu_stmt_list = NULL_TREE; |
a1ab4c31 | 4228 | tree gnu_after_list = NULL_TREE; |
ddb5a105 | 4229 | tree gnu_retval = NULL_TREE; |
35a382b8 | 4230 | tree gnu_call, gnu_result; |
0b3467c4 | 4231 | bool went_into_elab_proc = false; |
ddb5a105 EB |
4232 | bool pushed_binding_level = false; |
4233 | Entity_Id gnat_formal; | |
4234 | Node_Id gnat_actual; | |
f797c2b7 | 4235 | bool sync; |
a1ab4c31 | 4236 | |
a1ab4c31 AC |
4237 | gcc_assert (TREE_CODE (gnu_subprog_type) == FUNCTION_TYPE); |
4238 | ||
ced57283 EB |
4239 | /* If we are calling a stubbed function, raise Program_Error, but Elaborate |
4240 | all our args first. */ | |
4241 | if (TREE_CODE (gnu_subprog) == FUNCTION_DECL && DECL_STUBBED_P (gnu_subprog)) | |
a1ab4c31 | 4242 | { |
ced57283 EB |
4243 | tree call_expr = build_call_raise (PE_Stubbed_Subprogram_Called, |
4244 | gnat_node, N_Raise_Program_Error); | |
4245 | ||
a1ab4c31 AC |
4246 | for (gnat_actual = First_Actual (gnat_node); |
4247 | Present (gnat_actual); | |
4248 | gnat_actual = Next_Actual (gnat_actual)) | |
4249 | add_stmt (gnat_to_gnu (gnat_actual)); | |
4250 | ||
35a382b8 | 4251 | if (returning_value) |
ced57283 | 4252 | { |
ddb5a105 EB |
4253 | *gnu_result_type_p = gnu_result_type; |
4254 | return build1 (NULL_EXPR, gnu_result_type, call_expr); | |
ced57283 | 4255 | } |
a1ab4c31 | 4256 | |
ced57283 | 4257 | return call_expr; |
a1ab4c31 AC |
4258 | } |
4259 | ||
87411e95 EB |
4260 | /* For a call to a nested function, check the inlining status. */ |
4261 | if (TREE_CODE (gnu_subprog) == FUNCTION_DECL | |
4262 | && decl_function_context (gnu_subprog)) | |
4263 | check_inlining_for_nested_subprog (gnu_subprog); | |
4264 | ||
a1ab4c31 AC |
4265 | /* The only way we can be making a call via an access type is if Name is an |
4266 | explicit dereference. In that case, get the list of formal args from the | |
ced57283 | 4267 | type the access type is pointing to. Otherwise, get the formals from the |
a1ab4c31 AC |
4268 | entity being called. */ |
4269 | if (Nkind (Name (gnat_node)) == N_Explicit_Dereference) | |
4270 | gnat_formal = First_Formal_With_Extras (Etype (Name (gnat_node))); | |
4271 | else if (Nkind (Name (gnat_node)) == N_Attribute_Reference) | |
4272 | /* Assume here that this must be 'Elab_Body or 'Elab_Spec. */ | |
ced57283 | 4273 | gnat_formal = Empty; |
a1ab4c31 AC |
4274 | else |
4275 | gnat_formal = First_Formal_With_Extras (Entity (Name (gnat_node))); | |
4276 | ||
ddb5a105 EB |
4277 | /* The lifetime of the temporaries created for the call ends right after the |
4278 | return value is copied, so we can give them the scope of the elaboration | |
4279 | routine at top level. */ | |
35a382b8 | 4280 | if (!current_function_decl) |
0b3467c4 | 4281 | { |
2231f17f | 4282 | current_function_decl = get_elaboration_procedure (); |
0b3467c4 EB |
4283 | went_into_elab_proc = true; |
4284 | } | |
4285 | ||
4a582c9f EB |
4286 | /* First, create the temporary for the return value when: |
4287 | ||
4288 | 1. There is no target and the function has copy-in/copy-out parameters, | |
4289 | because we need to preserve the return value before copying back the | |
4290 | parameters. | |
4291 | ||
5d2a63dc EB |
4292 | 2. There is no target and the call is made for neither an object nor a |
4293 | renaming declaration, nor a return statement, and the return type has | |
4294 | variable size, because in this case the gimplifier cannot create the | |
4295 | temporary, or more generally is simply an aggregate type, because the | |
4296 | gimplifier would create the temporary in the outermost scope instead | |
4297 | of locally. | |
4a582c9f EB |
4298 | |
4299 | 3. There is a target and it is a slice or an array with fixed size, | |
4300 | and the return type has variable size, because the gimplifier | |
4301 | doesn't handle these cases. | |
4302 | ||
5d2a63dc EB |
4303 | 4. There is no target and we have misaligned In Out or Out parameters |
4304 | passed by reference, because we need to preserve the return value | |
4305 | before copying back the parameters. However, in this case, we'll | |
4306 | defer creating the temporary, see below. | |
4307 | ||
4a582c9f EB |
4308 | This must be done before we push a binding level around the call, since |
4309 | we will pop it before copying the return value. */ | |
ddb5a105 | 4310 | if (function_call |
4a582c9f EB |
4311 | && ((!gnu_target && TYPE_CI_CO_LIST (gnu_subprog_type)) |
4312 | || (!gnu_target | |
4313 | && Nkind (Parent (gnat_node)) != N_Object_Declaration | |
fc7a823e | 4314 | && Nkind (Parent (gnat_node)) != N_Object_Renaming_Declaration |
5d2a63dc EB |
4315 | && Nkind (Parent (gnat_node)) != N_Simple_Return_Statement |
4316 | && AGGREGATE_TYPE_P (gnu_result_type) | |
4317 | && !TYPE_IS_FAT_POINTER_P (gnu_result_type)) | |
4a582c9f EB |
4318 | || (gnu_target |
4319 | && (TREE_CODE (gnu_target) == ARRAY_RANGE_REF | |
4320 | || (TREE_CODE (TREE_TYPE (gnu_target)) == ARRAY_TYPE | |
4321 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_target))) | |
4322 | == INTEGER_CST)) | |
4323 | && TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST))) | |
93e708f9 EB |
4324 | { |
4325 | gnu_retval = create_temporary ("R", gnu_result_type); | |
4326 | DECL_RETURN_VALUE_P (gnu_retval) = 1; | |
4327 | } | |
ddb5a105 | 4328 | |
5d2a63dc EB |
4329 | /* If we don't need a value or have already created it, push a binding level |
4330 | around the call. This will narrow the lifetime of the temporaries we may | |
4331 | need to make when translating the parameters as much as possible. */ | |
4332 | if (!returning_value || gnu_retval) | |
4333 | { | |
4334 | start_stmt_group (); | |
4335 | gnat_pushlevel (); | |
4336 | pushed_binding_level = true; | |
4337 | } | |
4338 | ||
ced57283 EB |
4339 | /* Create the list of the actual parameters as GCC expects it, namely a |
4340 | chain of TREE_LIST nodes in which the TREE_VALUE field of each node | |
4341 | is an expression and the TREE_PURPOSE field is null. But skip Out | |
4342 | parameters not passed by reference and that need not be copied in. */ | |
a1ab4c31 AC |
4343 | for (gnat_actual = First_Actual (gnat_node); |
4344 | Present (gnat_actual); | |
4345 | gnat_formal = Next_Formal_With_Extras (gnat_formal), | |
4346 | gnat_actual = Next_Actual (gnat_actual)) | |
4347 | { | |
19f51f28 | 4348 | Entity_Id gnat_formal_type = Etype (gnat_formal); |
7cdb6871 | 4349 | tree gnu_formal_type = gnat_to_gnu_type (gnat_formal_type); |
ced57283 EB |
4350 | tree gnu_formal = present_gnu_tree (gnat_formal) |
4351 | ? get_gnu_tree (gnat_formal) : NULL_TREE; | |
c946adde EB |
4352 | const bool is_true_formal_parm |
4353 | = gnu_formal && TREE_CODE (gnu_formal) == PARM_DECL; | |
033ba5bf | 4354 | const bool is_by_ref_formal_parm |
1eb58520 AC |
4355 | = is_true_formal_parm |
4356 | && (DECL_BY_REF_P (gnu_formal) | |
4357 | || DECL_BY_COMPONENT_PTR_P (gnu_formal)); | |
c34f3839 EB |
4358 | /* In the Out or In Out case, we must suppress conversions that yield |
4359 | an lvalue but can nevertheless cause the creation of a temporary, | |
4360 | because we need the real object in this case, either to pass its | |
4361 | address if it's passed by reference or as target of the back copy | |
ddb5a105 | 4362 | done after the call if it uses the copy-in/copy-out mechanism. |
c34f3839 | 4363 | We do it in the In case too, except for an unchecked conversion |
19f51f28 EB |
4364 | to an elementary type or a constrained composite type because it |
4365 | alone can cause the actual to be misaligned and the addressability | |
4366 | test is applied to the real object. */ | |
c946adde | 4367 | const bool suppress_type_conversion |
a1ab4c31 | 4368 | = ((Nkind (gnat_actual) == N_Unchecked_Type_Conversion |
19f51f28 EB |
4369 | && (Ekind (gnat_formal) != E_In_Parameter |
4370 | || (Is_Composite_Type (Underlying_Type (gnat_formal_type)) | |
4371 | && !Is_Constrained (Underlying_Type (gnat_formal_type))))) | |
a1ab4c31 | 4372 | || (Nkind (gnat_actual) == N_Type_Conversion |
19f51f28 | 4373 | && Is_Composite_Type (Underlying_Type (gnat_formal_type)))); |
ced57283 EB |
4374 | Node_Id gnat_name = suppress_type_conversion |
4375 | ? Expression (gnat_actual) : gnat_actual; | |
a1ab4c31 AC |
4376 | tree gnu_name = gnat_to_gnu (gnat_name), gnu_name_type; |
4377 | tree gnu_actual; | |
4378 | ||
4379 | /* If it's possible we may need to use this expression twice, make sure | |
ced57283 | 4380 | that any side-effects are handled via SAVE_EXPRs; likewise if we need |
7194767c | 4381 | to force side-effects before the call. */ |
d747d005 | 4382 | if (Ekind (gnat_formal) != E_In_Parameter && !is_by_ref_formal_parm) |
fc7a823e EB |
4383 | { |
4384 | tree init = NULL_TREE; | |
4385 | gnu_name = gnat_stabilize_reference (gnu_name, true, &init); | |
4386 | if (init) | |
4387 | gnu_name | |
4388 | = build_compound_expr (TREE_TYPE (gnu_name), init, gnu_name); | |
4389 | } | |
a1ab4c31 AC |
4390 | |
4391 | /* If we are passing a non-addressable parameter by reference, pass the | |
4392 | address of a copy. In the Out or In Out case, set up to copy back | |
4393 | out after the call. */ | |
033ba5bf | 4394 | if (is_by_ref_formal_parm |
a1ab4c31 AC |
4395 | && (gnu_name_type = gnat_to_gnu_type (Etype (gnat_name))) |
4396 | && !addressable_p (gnu_name, gnu_name_type)) | |
4397 | { | |
35a382b8 | 4398 | bool in_param = (Ekind (gnat_formal) == E_In_Parameter); |
0b3467c4 EB |
4399 | tree gnu_orig = gnu_name, gnu_temp, gnu_stmt; |
4400 | ||
4401 | /* Do not issue warnings for CONSTRUCTORs since this is not a copy | |
4402 | but sort of an instantiation for them. */ | |
4403 | if (TREE_CODE (gnu_name) == CONSTRUCTOR) | |
4404 | ; | |
4405 | ||
4406 | /* If the type is passed by reference, a copy is not allowed. */ | |
a0b8b1b7 | 4407 | else if (TYPE_IS_BY_REFERENCE_P (gnu_formal_type)) |
0b3467c4 EB |
4408 | post_error ("misaligned actual cannot be passed by reference", |
4409 | gnat_actual); | |
4410 | ||
4411 | /* For users of Starlet we issue a warning because the interface | |
4412 | apparently assumes that by-ref parameters outlive the procedure | |
4413 | invocation. The code still will not work as intended, but we | |
4414 | cannot do much better since low-level parts of the back-end | |
4415 | would allocate temporaries at will because of the misalignment | |
4416 | if we did not do so here. */ | |
4417 | else if (Is_Valued_Procedure (Entity (Name (gnat_node)))) | |
4418 | { | |
4419 | post_error | |
4420 | ("?possible violation of implicit assumption", gnat_actual); | |
4421 | post_error_ne | |
4422 | ("?made by pragma Import_Valued_Procedure on &", gnat_actual, | |
4423 | Entity (Name (gnat_node))); | |
4424 | post_error_ne ("?because of misalignment of &", gnat_actual, | |
4425 | gnat_formal); | |
4426 | } | |
a1ab4c31 | 4427 | |
56fe7b05 EB |
4428 | /* If the actual type of the object is already the nominal type, |
4429 | we have nothing to do, except if the size is self-referential | |
4430 | in which case we'll remove the unpadding below. */ | |
4431 | if (TREE_TYPE (gnu_name) == gnu_name_type | |
4432 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_name_type))) | |
4433 | ; | |
4434 | ||
0b3467c4 | 4435 | /* Otherwise remove the unpadding from all the objects. */ |
56fe7b05 | 4436 | else if (TREE_CODE (gnu_name) == COMPONENT_REF |
315cff15 EB |
4437 | && TYPE_IS_PADDING_P |
4438 | (TREE_TYPE (TREE_OPERAND (gnu_name, 0)))) | |
0b3467c4 | 4439 | gnu_orig = gnu_name = TREE_OPERAND (gnu_name, 0); |
a1ab4c31 | 4440 | |
169afcb9 EB |
4441 | /* Otherwise convert to the nominal type of the object if needed. |
4442 | There are several cases in which we need to make the temporary | |
4443 | using this type instead of the actual type of the object when | |
4444 | they are distinct, because the expectations of the callee would | |
4445 | otherwise not be met: | |
a1ab4c31 | 4446 | - if it's a justified modular type, |
169afcb9 EB |
4447 | - if the actual type is a smaller form of it, |
4448 | - if it's a smaller form of the actual type. */ | |
4449 | else if ((TREE_CODE (gnu_name_type) == RECORD_TYPE | |
4450 | && (TYPE_JUSTIFIED_MODULAR_P (gnu_name_type) | |
4451 | || smaller_form_type_p (TREE_TYPE (gnu_name), | |
4452 | gnu_name_type))) | |
4453 | || (INTEGRAL_TYPE_P (gnu_name_type) | |
4454 | && smaller_form_type_p (gnu_name_type, | |
4455 | TREE_TYPE (gnu_name)))) | |
a1ab4c31 AC |
4456 | gnu_name = convert (gnu_name_type, gnu_name); |
4457 | ||
ddb5a105 EB |
4458 | /* If this is an In Out or Out parameter and we're returning a value, |
4459 | we need to create a temporary for the return value because we must | |
4460 | preserve it before copying back at the very end. */ | |
4461 | if (!in_param && returning_value && !gnu_retval) | |
93e708f9 EB |
4462 | { |
4463 | gnu_retval = create_temporary ("R", gnu_result_type); | |
4464 | DECL_RETURN_VALUE_P (gnu_retval) = 1; | |
4465 | } | |
ddb5a105 | 4466 | |
5d2a63dc EB |
4467 | /* If we haven't pushed a binding level, push it now. This will |
4468 | narrow the lifetime of the temporary we are about to make as | |
4469 | much as possible. */ | |
4470 | if (!pushed_binding_level && (!returning_value || gnu_retval)) | |
35a382b8 EB |
4471 | { |
4472 | start_stmt_group (); | |
4473 | gnat_pushlevel (); | |
4474 | pushed_binding_level = true; | |
4475 | } | |
4476 | ||
ddb5a105 | 4477 | /* Create an explicit temporary holding the copy. */ |
35a382b8 EB |
4478 | gnu_temp |
4479 | = create_init_temporary ("A", gnu_name, &gnu_stmt, gnat_actual); | |
cb3d597d | 4480 | |
0b3467c4 | 4481 | /* But initialize it on the fly like for an implicit temporary as |
ddb5a105 | 4482 | we aren't necessarily having a statement list. */ |
39ab2e8f RK |
4483 | gnu_name = build_compound_expr (TREE_TYPE (gnu_name), gnu_stmt, |
4484 | gnu_temp); | |
cb3d597d | 4485 | |
ced57283 | 4486 | /* Set up to move the copy back to the original if needed. */ |
35a382b8 | 4487 | if (!in_param) |
a1ab4c31 | 4488 | { |
bb29e9ff EB |
4489 | /* If the original is a COND_EXPR whose first arm isn't meant to |
4490 | be further used, just deal with the second arm. This is very | |
4491 | likely the conditional expression built for a check. */ | |
4492 | if (TREE_CODE (gnu_orig) == COND_EXPR | |
4493 | && TREE_CODE (TREE_OPERAND (gnu_orig, 1)) == COMPOUND_EXPR | |
4494 | && integer_zerop | |
4495 | (TREE_OPERAND (TREE_OPERAND (gnu_orig, 1), 1))) | |
4496 | gnu_orig = TREE_OPERAND (gnu_orig, 2); | |
4497 | ||
4498 | gnu_stmt | |
4499 | = build_binary_op (MODIFY_EXPR, NULL_TREE, gnu_orig, gnu_temp); | |
0b3467c4 | 4500 | set_expr_location_from_node (gnu_stmt, gnat_node); |
bb29e9ff | 4501 | |
0b3467c4 | 4502 | append_to_statement_list (gnu_stmt, &gnu_after_list); |
a1ab4c31 AC |
4503 | } |
4504 | } | |
4505 | ||
4506 | /* Start from the real object and build the actual. */ | |
4507 | gnu_actual = gnu_name; | |
4508 | ||
f797c2b7 EB |
4509 | /* If atomic access is required for an In or In Out actual parameter, |
4510 | build the atomic load. */ | |
033ba5bf EB |
4511 | if (is_true_formal_parm |
4512 | && !is_by_ref_formal_parm | |
4513 | && Ekind (gnat_formal) != E_Out_Parameter | |
f797c2b7 EB |
4514 | && atomic_access_required_p (gnat_actual, &sync)) |
4515 | gnu_actual = build_atomic_load (gnu_actual, sync); | |
033ba5bf | 4516 | |
a1ab4c31 AC |
4517 | /* If this was a procedure call, we may not have removed any padding. |
4518 | So do it here for the part we will use as an input, if any. */ | |
4519 | if (Ekind (gnat_formal) != E_Out_Parameter | |
a1ab4c31 | 4520 | && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual))) |
c34f3839 EB |
4521 | gnu_actual |
4522 | = convert (get_unpadded_type (Etype (gnat_actual)), gnu_actual); | |
4523 | ||
4524 | /* Put back the conversion we suppressed above in the computation of the | |
4525 | real object. And even if we didn't suppress any conversion there, we | |
4526 | may have suppressed a conversion to the Etype of the actual earlier, | |
4527 | since the parent is a procedure call, so put it back here. */ | |
4528 | if (suppress_type_conversion | |
4529 | && Nkind (gnat_actual) == N_Unchecked_Type_Conversion) | |
4530 | gnu_actual | |
4531 | = unchecked_convert (gnat_to_gnu_type (Etype (gnat_actual)), | |
4532 | gnu_actual, No_Truncation (gnat_actual)); | |
a1ab4c31 | 4533 | else |
c34f3839 EB |
4534 | gnu_actual |
4535 | = convert (gnat_to_gnu_type (Etype (gnat_actual)), gnu_actual); | |
4536 | ||
4537 | /* Make sure that the actual is in range of the formal's type. */ | |
4538 | if (Ekind (gnat_formal) != E_Out_Parameter | |
4539 | && Do_Range_Check (gnat_actual)) | |
4540 | gnu_actual | |
19f51f28 | 4541 | = emit_range_check (gnu_actual, gnat_formal_type, gnat_actual); |
a1ab4c31 | 4542 | |
a1ab4c31 AC |
4543 | /* Unless this is an In parameter, we must remove any justified modular |
4544 | building from GNU_NAME to get an lvalue. */ | |
4545 | if (Ekind (gnat_formal) != E_In_Parameter | |
4546 | && TREE_CODE (gnu_name) == CONSTRUCTOR | |
4547 | && TREE_CODE (TREE_TYPE (gnu_name)) == RECORD_TYPE | |
4548 | && TYPE_JUSTIFIED_MODULAR_P (TREE_TYPE (gnu_name))) | |
c34f3839 EB |
4549 | gnu_name |
4550 | = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_name))), gnu_name); | |
a1ab4c31 | 4551 | |
96540b24 | 4552 | /* First see if the parameter is passed by reference. */ |
c946adde | 4553 | if (is_true_formal_parm && DECL_BY_REF_P (gnu_formal)) |
a1ab4c31 AC |
4554 | { |
4555 | if (Ekind (gnat_formal) != E_In_Parameter) | |
4556 | { | |
4557 | /* In Out or Out parameters passed by reference don't use the | |
ddb5a105 | 4558 | copy-in/copy-out mechanism so the address of the real object |
a1ab4c31 AC |
4559 | must be passed to the function. */ |
4560 | gnu_actual = gnu_name; | |
4561 | ||
4562 | /* If we have a padded type, be sure we've removed padding. */ | |
0b3467c4 | 4563 | if (TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual))) |
a1ab4c31 AC |
4564 | gnu_actual = convert (get_unpadded_type (Etype (gnat_actual)), |
4565 | gnu_actual); | |
4566 | ||
4567 | /* If we have the constructed subtype of an aliased object | |
4568 | with an unconstrained nominal subtype, the type of the | |
4569 | actual includes the template, although it is formally | |
4570 | constrained. So we need to convert it back to the real | |
4571 | constructed subtype to retrieve the constrained part | |
4572 | and takes its address. */ | |
4573 | if (TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE | |
4574 | && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (gnu_actual)) | |
a1ab4c31 | 4575 | && Is_Constr_Subt_For_UN_Aliased (Etype (gnat_actual)) |
43a4dd82 | 4576 | && Is_Array_Type (Underlying_Type (Etype (gnat_actual)))) |
a1ab4c31 AC |
4577 | gnu_actual = convert (gnat_to_gnu_type (Etype (gnat_actual)), |
4578 | gnu_actual); | |
4579 | } | |
4580 | ||
0b3467c4 EB |
4581 | /* There is no need to convert the actual to the formal's type before |
4582 | taking its address. The only exception is for unconstrained array | |
4583 | types because of the way we build fat pointers. */ | |
7bf9a5ac EB |
4584 | if (TREE_CODE (gnu_formal_type) == UNCONSTRAINED_ARRAY_TYPE) |
4585 | { | |
4586 | /* Put back a view conversion for In Out or Out parameters. */ | |
4587 | if (Ekind (gnat_formal) != E_In_Parameter) | |
4588 | gnu_actual = convert (gnat_to_gnu_type (Etype (gnat_actual)), | |
4589 | gnu_actual); | |
4590 | gnu_actual = convert (gnu_formal_type, gnu_actual); | |
4591 | } | |
0b3467c4 | 4592 | |
a1ab4c31 | 4593 | /* The symmetry of the paths to the type of an entity is broken here |
1e17ef87 | 4594 | since arguments don't know that they will be passed by ref. */ |
7bf9a5ac | 4595 | gnu_formal_type = TREE_TYPE (gnu_formal); |
a1ab4c31 AC |
4596 | gnu_actual = build_unary_op (ADDR_EXPR, gnu_formal_type, gnu_actual); |
4597 | } | |
96540b24 EB |
4598 | |
4599 | /* Then see if the parameter is an array passed to a foreign convention | |
4600 | subprogram. */ | |
c946adde | 4601 | else if (is_true_formal_parm && DECL_BY_COMPONENT_PTR_P (gnu_formal)) |
a1ab4c31 | 4602 | { |
7bf9a5ac | 4603 | gnu_formal_type = TREE_TYPE (gnu_formal); |
a1ab4c31 AC |
4604 | gnu_actual = maybe_implicit_deref (gnu_actual); |
4605 | gnu_actual = maybe_unconstrained_array (gnu_actual); | |
4606 | ||
315cff15 | 4607 | if (TYPE_IS_PADDING_P (gnu_formal_type)) |
a1ab4c31 AC |
4608 | { |
4609 | gnu_formal_type = TREE_TYPE (TYPE_FIELDS (gnu_formal_type)); | |
4610 | gnu_actual = convert (gnu_formal_type, gnu_actual); | |
4611 | } | |
4612 | ||
4613 | /* Take the address of the object and convert to the proper pointer | |
4614 | type. We'd like to actually compute the address of the beginning | |
4615 | of the array using an ADDR_EXPR of an ARRAY_REF, but there's a | |
4616 | possibility that the ARRAY_REF might return a constant and we'd be | |
4617 | getting the wrong address. Neither approach is exactly correct, | |
4618 | but this is the most likely to work in all cases. */ | |
0b3467c4 | 4619 | gnu_actual = build_unary_op (ADDR_EXPR, gnu_formal_type, gnu_actual); |
a1ab4c31 | 4620 | } |
96540b24 | 4621 | |
96540b24 | 4622 | /* Otherwise the parameter is passed by copy. */ |
a1ab4c31 AC |
4623 | else |
4624 | { | |
ced57283 | 4625 | tree gnu_size; |
a1ab4c31 AC |
4626 | |
4627 | if (Ekind (gnat_formal) != E_In_Parameter) | |
4628 | gnu_name_list = tree_cons (NULL_TREE, gnu_name, gnu_name_list); | |
4629 | ||
96540b24 EB |
4630 | /* If we didn't create a PARM_DECL for the formal, this means that |
4631 | it is an Out parameter not passed by reference and that need not | |
4632 | be copied in. In this case, the value of the actual need not be | |
4633 | read. However, we still need to make sure that its side-effects | |
4634 | are evaluated before the call, so we evaluate its address. */ | |
c946adde | 4635 | if (!is_true_formal_parm) |
932c8650 | 4636 | { |
932c8650 | 4637 | if (TREE_SIDE_EFFECTS (gnu_name)) |
96540b24 EB |
4638 | { |
4639 | tree addr = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_name); | |
4640 | append_to_statement_list (addr, &gnu_stmt_list); | |
4641 | } | |
932c8650 EB |
4642 | continue; |
4643 | } | |
a1ab4c31 | 4644 | |
0b3467c4 EB |
4645 | gnu_actual = convert (gnu_formal_type, gnu_actual); |
4646 | ||
a1ab4c31 AC |
4647 | /* If this is 'Null_Parameter, pass a zero even though we are |
4648 | dereferencing it. */ | |
ced57283 EB |
4649 | if (TREE_CODE (gnu_actual) == INDIRECT_REF |
4650 | && TREE_PRIVATE (gnu_actual) | |
4651 | && (gnu_size = TYPE_SIZE (TREE_TYPE (gnu_actual))) | |
4652 | && TREE_CODE (gnu_size) == INTEGER_CST | |
4653 | && compare_tree_int (gnu_size, BITS_PER_WORD) <= 0) | |
9a1bdc31 EB |
4654 | { |
4655 | tree type_for_size | |
4656 | = gnat_type_for_size (TREE_INT_CST_LOW (gnu_size), 1); | |
4657 | gnu_actual | |
4658 | = unchecked_convert (DECL_ARG_TYPE (gnu_formal), | |
4659 | build_int_cst (type_for_size, 0), | |
4660 | false); | |
4661 | } | |
a1ab4c31 AC |
4662 | else |
4663 | gnu_actual = convert (DECL_ARG_TYPE (gnu_formal), gnu_actual); | |
4664 | } | |
4665 | ||
9771b263 | 4666 | vec_safe_push (gnu_actual_vec, gnu_actual); |
a1ab4c31 AC |
4667 | } |
4668 | ||
ddb5a105 EB |
4669 | gnu_call |
4670 | = build_call_vec (gnu_result_type, gnu_subprog_addr, gnu_actual_vec); | |
ced57283 | 4671 | set_expr_location_from_node (gnu_call, gnat_node); |
a1ab4c31 | 4672 | |
ddb5a105 EB |
4673 | /* If we have created a temporary for the return value, initialize it. */ |
4674 | if (gnu_retval) | |
4675 | { | |
4676 | tree gnu_stmt | |
4677 | = build_binary_op (INIT_EXPR, NULL_TREE, gnu_retval, gnu_call); | |
4678 | set_expr_location_from_node (gnu_stmt, gnat_node); | |
4679 | append_to_statement_list (gnu_stmt, &gnu_stmt_list); | |
4680 | gnu_call = gnu_retval; | |
4681 | } | |
4682 | ||
35a382b8 EB |
4683 | /* If this is a subprogram with copy-in/copy-out parameters, we need to |
4684 | unpack the valued returned from the function into the In Out or Out | |
4685 | parameters. We deal with the function return (if this is an Ada | |
4686 | function) below. */ | |
d47d0a8d | 4687 | if (TYPE_CI_CO_LIST (gnu_subprog_type)) |
a1ab4c31 | 4688 | { |
0b3467c4 EB |
4689 | /* List of FIELD_DECLs associated with the PARM_DECLs of the copy-in/ |
4690 | copy-out parameters. */ | |
a09d56d8 EB |
4691 | tree gnu_cico_list = TYPE_CI_CO_LIST (gnu_subprog_type); |
4692 | const int length = list_length (gnu_cico_list); | |
a1ab4c31 | 4693 | |
35a382b8 EB |
4694 | /* The call sequence must contain one and only one call, even though the |
4695 | function is pure. Save the result into a temporary if needed. */ | |
a1ab4c31 AC |
4696 | if (length > 1) |
4697 | { | |
ddb5a105 EB |
4698 | if (!gnu_retval) |
4699 | { | |
4700 | tree gnu_stmt; | |
ddb5a105 EB |
4701 | gnu_call |
4702 | = create_init_temporary ("P", gnu_call, &gnu_stmt, gnat_node); | |
4703 | append_to_statement_list (gnu_stmt, &gnu_stmt_list); | |
4704 | } | |
0b3467c4 | 4705 | |
a1ab4c31 | 4706 | gnu_name_list = nreverse (gnu_name_list); |
a1ab4c31 AC |
4707 | } |
4708 | ||
35a382b8 EB |
4709 | /* The first entry is for the actual return value if this is a |
4710 | function, so skip it. */ | |
b83053bf | 4711 | if (function_call) |
35a382b8 EB |
4712 | gnu_cico_list = TREE_CHAIN (gnu_cico_list); |
4713 | ||
a1ab4c31 AC |
4714 | if (Nkind (Name (gnat_node)) == N_Explicit_Dereference) |
4715 | gnat_formal = First_Formal_With_Extras (Etype (Name (gnat_node))); | |
4716 | else | |
4717 | gnat_formal = First_Formal_With_Extras (Entity (Name (gnat_node))); | |
4718 | ||
4719 | for (gnat_actual = First_Actual (gnat_node); | |
4720 | Present (gnat_actual); | |
4721 | gnat_formal = Next_Formal_With_Extras (gnat_formal), | |
4722 | gnat_actual = Next_Actual (gnat_actual)) | |
35a382b8 | 4723 | /* If we are dealing with a copy-in/copy-out parameter, we must |
a1ab4c31 AC |
4724 | retrieve its value from the record returned in the call. */ |
4725 | if (!(present_gnu_tree (gnat_formal) | |
4726 | && TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL | |
4727 | && (DECL_BY_REF_P (get_gnu_tree (gnat_formal)) | |
1eb58520 | 4728 | || DECL_BY_COMPONENT_PTR_P (get_gnu_tree (gnat_formal)))) |
a1ab4c31 AC |
4729 | && Ekind (gnat_formal) != E_In_Parameter) |
4730 | { | |
4731 | /* Get the value to assign to this Out or In Out parameter. It is | |
4732 | either the result of the function if there is only a single such | |
4733 | parameter or the appropriate field from the record returned. */ | |
4734 | tree gnu_result | |
ced57283 EB |
4735 | = length == 1 |
4736 | ? gnu_call | |
64235766 EB |
4737 | : build_component_ref (gnu_call, TREE_PURPOSE (gnu_cico_list), |
4738 | false); | |
a1ab4c31 AC |
4739 | |
4740 | /* If the actual is a conversion, get the inner expression, which | |
4741 | will be the real destination, and convert the result to the | |
4742 | type of the actual parameter. */ | |
4743 | tree gnu_actual | |
4744 | = maybe_unconstrained_array (TREE_VALUE (gnu_name_list)); | |
4745 | ||
4746 | /* If the result is a padded type, remove the padding. */ | |
315cff15 | 4747 | if (TYPE_IS_PADDING_P (TREE_TYPE (gnu_result))) |
ced57283 EB |
4748 | gnu_result |
4749 | = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_result))), | |
4750 | gnu_result); | |
a1ab4c31 AC |
4751 | |
4752 | /* If the actual is a type conversion, the real target object is | |
4753 | denoted by the inner Expression and we need to convert the | |
4754 | result to the associated type. | |
4755 | We also need to convert our gnu assignment target to this type | |
4756 | if the corresponding GNU_NAME was constructed from the GNAT | |
4757 | conversion node and not from the inner Expression. */ | |
4758 | if (Nkind (gnat_actual) == N_Type_Conversion) | |
4759 | { | |
4760 | gnu_result | |
4761 | = convert_with_check | |
4762 | (Etype (Expression (gnat_actual)), gnu_result, | |
4763 | Do_Overflow_Check (gnat_actual), | |
4764 | Do_Range_Check (Expression (gnat_actual)), | |
10069d53 | 4765 | Float_Truncate (gnat_actual), gnat_actual); |
a1ab4c31 AC |
4766 | |
4767 | if (!Is_Composite_Type (Underlying_Type (Etype (gnat_formal)))) | |
4768 | gnu_actual = convert (TREE_TYPE (gnu_result), gnu_actual); | |
4769 | } | |
4770 | ||
4771 | /* Unchecked conversions as actuals for Out parameters are not | |
4772 | allowed in user code because they are not variables, but do | |
4773 | occur in front-end expansions. The associated GNU_NAME is | |
4774 | always obtained from the inner expression in such cases. */ | |
4775 | else if (Nkind (gnat_actual) == N_Unchecked_Type_Conversion) | |
4776 | gnu_result = unchecked_convert (TREE_TYPE (gnu_actual), | |
4777 | gnu_result, | |
4778 | No_Truncation (gnat_actual)); | |
4779 | else | |
4780 | { | |
4781 | if (Do_Range_Check (gnat_actual)) | |
10069d53 EB |
4782 | gnu_result |
4783 | = emit_range_check (gnu_result, Etype (gnat_actual), | |
4784 | gnat_actual); | |
a1ab4c31 AC |
4785 | |
4786 | if (!(!TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_actual))) | |
4787 | && TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_result))))) | |
4788 | gnu_result = convert (TREE_TYPE (gnu_actual), gnu_result); | |
4789 | } | |
4790 | ||
f797c2b7 EB |
4791 | /* If an outer atomic access is required for an actual parameter, |
4792 | build the load-modify-store sequence. */ | |
4793 | if (outer_atomic_access_required_p (gnat_actual)) | |
4794 | gnu_result | |
4795 | = build_load_modify_store (gnu_actual, gnu_result, gnat_node); | |
4796 | ||
4797 | /* Or else, if simple atomic access is required, build the atomic | |
4798 | store. */ | |
4799 | else if (atomic_access_required_p (gnat_actual, &sync)) | |
4800 | gnu_result = build_atomic_store (gnu_actual, gnu_result, sync); | |
4801 | ||
4802 | /* Otherwise build a regular assignment. */ | |
033ba5bf EB |
4803 | else |
4804 | gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE, | |
4805 | gnu_actual, gnu_result); | |
f797c2b7 EB |
4806 | |
4807 | if (EXPR_P (gnu_result)) | |
4808 | set_expr_location_from_node (gnu_result, gnat_node); | |
ddb5a105 | 4809 | append_to_statement_list (gnu_result, &gnu_stmt_list); |
a09d56d8 | 4810 | gnu_cico_list = TREE_CHAIN (gnu_cico_list); |
a1ab4c31 AC |
4811 | gnu_name_list = TREE_CHAIN (gnu_name_list); |
4812 | } | |
ced57283 | 4813 | } |
35a382b8 EB |
4814 | |
4815 | /* If this is a function call, the result is the call expression unless a | |
4816 | target is specified, in which case we copy the result into the target | |
4817 | and return the assignment statement. */ | |
ddb5a105 | 4818 | if (function_call) |
35a382b8 | 4819 | { |
35a382b8 EB |
4820 | /* If this is a function with copy-in/copy-out parameters, extract the |
4821 | return value from it and update the return type. */ | |
4822 | if (TYPE_CI_CO_LIST (gnu_subprog_type)) | |
4823 | { | |
b83053bf | 4824 | tree gnu_elmt = TYPE_CI_CO_LIST (gnu_subprog_type); |
64235766 EB |
4825 | gnu_call |
4826 | = build_component_ref (gnu_call, TREE_PURPOSE (gnu_elmt), false); | |
35a382b8 EB |
4827 | gnu_result_type = TREE_TYPE (gnu_call); |
4828 | } | |
4829 | ||
4830 | /* If the function returns an unconstrained array or by direct reference, | |
4831 | we have to dereference the pointer. */ | |
4832 | if (TYPE_RETURN_UNCONSTRAINED_P (gnu_subprog_type) | |
4833 | || TYPE_RETURN_BY_DIRECT_REF_P (gnu_subprog_type)) | |
4834 | gnu_call = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_call); | |
4835 | ||
4836 | if (gnu_target) | |
4837 | { | |
4838 | Node_Id gnat_parent = Parent (gnat_node); | |
4839 | enum tree_code op_code; | |
4840 | ||
4841 | /* If range check is needed, emit code to generate it. */ | |
4842 | if (Do_Range_Check (gnat_node)) | |
4843 | gnu_call | |
4844 | = emit_range_check (gnu_call, Etype (Name (gnat_parent)), | |
4845 | gnat_parent); | |
4846 | ||
ddb5a105 EB |
4847 | /* ??? If the return type has variable size, then force the return |
4848 | slot optimization as we would not be able to create a temporary. | |
ddb5a105 | 4849 | That's what has been done historically. */ |
fc7a823e | 4850 | if (return_type_with_variable_size_p (gnu_result_type)) |
35a382b8 EB |
4851 | op_code = INIT_EXPR; |
4852 | else | |
4853 | op_code = MODIFY_EXPR; | |
4854 | ||
f797c2b7 EB |
4855 | /* Use the required method to move the result to the target. */ |
4856 | if (outer_atomic_access) | |
4857 | gnu_call | |
4858 | = build_load_modify_store (gnu_target, gnu_call, gnat_node); | |
4859 | else if (atomic_access) | |
4860 | gnu_call = build_atomic_store (gnu_target, gnu_call, atomic_sync); | |
033ba5bf EB |
4861 | else |
4862 | gnu_call | |
4863 | = build_binary_op (op_code, NULL_TREE, gnu_target, gnu_call); | |
f797c2b7 EB |
4864 | |
4865 | if (EXPR_P (gnu_call)) | |
4866 | set_expr_location_from_node (gnu_call, gnat_parent); | |
ddb5a105 | 4867 | append_to_statement_list (gnu_call, &gnu_stmt_list); |
35a382b8 EB |
4868 | } |
4869 | else | |
4870 | *gnu_result_type_p = get_unpadded_type (Etype (gnat_node)); | |
4871 | } | |
4872 | ||
4873 | /* Otherwise, if this is a procedure call statement without copy-in/copy-out | |
4874 | parameters, the result is just the call statement. */ | |
4875 | else if (!TYPE_CI_CO_LIST (gnu_subprog_type)) | |
ddb5a105 EB |
4876 | append_to_statement_list (gnu_call, &gnu_stmt_list); |
4877 | ||
4878 | /* Finally, add the copy back statements, if any. */ | |
4879 | append_to_statement_list (gnu_after_list, &gnu_stmt_list); | |
a1ab4c31 | 4880 | |
35a382b8 EB |
4881 | if (went_into_elab_proc) |
4882 | current_function_decl = NULL_TREE; | |
ced57283 | 4883 | |
ddb5a105 EB |
4884 | /* If we have pushed a binding level, pop it and finish up the enclosing |
4885 | statement group. */ | |
35a382b8 EB |
4886 | if (pushed_binding_level) |
4887 | { | |
ddb5a105 | 4888 | add_stmt (gnu_stmt_list); |
35a382b8 EB |
4889 | gnat_poplevel (); |
4890 | gnu_result = end_stmt_group (); | |
4891 | } | |
ddb5a105 EB |
4892 | |
4893 | /* Otherwise, retrieve the statement list, if any. */ | |
4894 | else if (gnu_stmt_list) | |
4895 | gnu_result = gnu_stmt_list; | |
4896 | ||
4897 | /* Otherwise, just return the call expression. */ | |
35a382b8 EB |
4898 | else |
4899 | return gnu_call; | |
4900 | ||
71196d4e EB |
4901 | /* If we nevertheless need a value, make a COMPOUND_EXPR to return it. |
4902 | But first simplify if we have only one statement in the list. */ | |
35a382b8 | 4903 | if (returning_value) |
71196d4e EB |
4904 | { |
4905 | tree first = expr_first (gnu_result), last = expr_last (gnu_result); | |
4906 | if (first == last) | |
4907 | gnu_result = first; | |
4908 | gnu_result | |
4909 | = build_compound_expr (TREE_TYPE (gnu_call), gnu_result, gnu_call); | |
4910 | } | |
35a382b8 EB |
4911 | |
4912 | return gnu_result; | |
a1ab4c31 AC |
4913 | } |
4914 | \f | |
4915 | /* Subroutine of gnat_to_gnu to translate gnat_node, an | |
4916 | N_Handled_Sequence_Of_Statements, to a GCC tree, which is returned. */ | |
4917 | ||
4918 | static tree | |
4919 | Handled_Sequence_Of_Statements_to_gnu (Node_Id gnat_node) | |
4920 | { | |
4921 | tree gnu_jmpsave_decl = NULL_TREE; | |
4922 | tree gnu_jmpbuf_decl = NULL_TREE; | |
4923 | /* If just annotating, ignore all EH and cleanups. */ | |
0ab0bf95 OH |
4924 | bool gcc_eh = (!type_annotate_only |
4925 | && Present (Exception_Handlers (gnat_node)) | |
4926 | && Back_End_Exceptions ()); | |
4927 | bool fe_sjlj | |
a1ab4c31 | 4928 | = (!type_annotate_only && Present (Exception_Handlers (gnat_node)) |
0ab0bf95 | 4929 | && Exception_Mechanism == Front_End_SJLJ); |
a1ab4c31 | 4930 | bool at_end = !type_annotate_only && Present (At_End_Proc (gnat_node)); |
0ab0bf95 | 4931 | bool binding_for_block = (at_end || gcc_eh || fe_sjlj); |
a1ab4c31 AC |
4932 | tree gnu_inner_block; /* The statement(s) for the block itself. */ |
4933 | tree gnu_result; | |
4934 | tree gnu_expr; | |
4935 | Node_Id gnat_temp; | |
362db0b2 TQ |
4936 | /* Node providing the sloc for the cleanup actions. */ |
4937 | Node_Id gnat_cleanup_loc_node = (Present (End_Label (gnat_node)) ? | |
4938 | End_Label (gnat_node) : | |
4939 | gnat_node); | |
a1ab4c31 AC |
4940 | |
4941 | /* The GCC exception handling mechanism can handle both ZCX and SJLJ schemes | |
4942 | and we have our own SJLJ mechanism. To call the GCC mechanism, we call | |
4943 | add_cleanup, and when we leave the binding, end_stmt_group will create | |
4944 | the TRY_FINALLY_EXPR. | |
4945 | ||
4946 | ??? The region level calls down there have been specifically put in place | |
4947 | for a ZCX context and currently the order in which things are emitted | |
4948 | (region/handlers) is different from the SJLJ case. Instead of putting | |
4949 | other calls with different conditions at other places for the SJLJ case, | |
4950 | it seems cleaner to reorder things for the SJLJ case and generalize the | |
4951 | condition to make it not ZCX specific. | |
4952 | ||
4953 | If there are any exceptions or cleanup processing involved, we need an | |
0ab0bf95 | 4954 | outer statement group (for Fe_Sjlj) and binding level. */ |
a1ab4c31 AC |
4955 | if (binding_for_block) |
4956 | { | |
4957 | start_stmt_group (); | |
4958 | gnat_pushlevel (); | |
4959 | } | |
4960 | ||
0ab0bf95 | 4961 | /* If using fe_sjlj, make the variables for the setjmp buffer and save |
a1ab4c31 AC |
4962 | area for address of previous buffer. Do this first since we need to have |
4963 | the setjmp buf known for any decls in this block. */ | |
0ab0bf95 | 4964 | if (fe_sjlj) |
a1ab4c31 | 4965 | { |
dddf8120 EB |
4966 | gnu_jmpsave_decl |
4967 | = create_var_decl (get_identifier ("JMPBUF_SAVE"), NULL_TREE, | |
4968 | jmpbuf_ptr_type, | |
4969 | build_call_n_expr (get_jmpbuf_decl, 0), | |
2056c5ed | 4970 | false, false, false, false, false, true, false, |
c1a569ef | 4971 | NULL, gnat_node); |
a1ab4c31 AC |
4972 | |
4973 | /* The __builtin_setjmp receivers will immediately reinstall it. Now | |
0ab0bf95 | 4974 | because of the unstructured form of EH used by fe_sjlj, there |
a1ab4c31 AC |
4975 | might be forward edges going to __builtin_setjmp receivers on which |
4976 | it is uninitialized, although they will never be actually taken. */ | |
4977 | TREE_NO_WARNING (gnu_jmpsave_decl) = 1; | |
dddf8120 EB |
4978 | gnu_jmpbuf_decl |
4979 | = create_var_decl (get_identifier ("JMP_BUF"), NULL_TREE, | |
4980 | jmpbuf_type, | |
4981 | NULL_TREE, | |
2056c5ed | 4982 | false, false, false, false, false, true, false, |
c1a569ef | 4983 | NULL, gnat_node); |
a1ab4c31 AC |
4984 | |
4985 | set_block_jmpbuf_decl (gnu_jmpbuf_decl); | |
4986 | ||
4987 | /* When we exit this block, restore the saved value. */ | |
dddf8120 | 4988 | add_cleanup (build_call_n_expr (set_jmpbuf_decl, 1, gnu_jmpsave_decl), |
362db0b2 | 4989 | gnat_cleanup_loc_node); |
a1ab4c31 AC |
4990 | } |
4991 | ||
4992 | /* If we are to call a function when exiting this block, add a cleanup | |
4993 | to the binding level we made above. Note that add_cleanup is FIFO | |
4994 | so we must register this cleanup after the EH cleanup just above. */ | |
4995 | if (at_end) | |
bc583f7a EB |
4996 | { |
4997 | tree proc_decl = gnat_to_gnu (At_End_Proc (gnat_node)); | |
4998 | /* When not optimizing, disable inlining of finalizers as this can | |
4999 | create a more complex CFG in the parent function. */ | |
5000 | if (!optimize) | |
5001 | DECL_DECLARED_INLINE_P (proc_decl) = 0; | |
5002 | add_cleanup (build_call_n_expr (proc_decl, 0), gnat_cleanup_loc_node); | |
5003 | } | |
a1ab4c31 AC |
5004 | |
5005 | /* Now build the tree for the declarations and statements inside this block. | |
5006 | If this is SJLJ, set our jmp_buf as the current buffer. */ | |
5007 | start_stmt_group (); | |
5008 | ||
0ab0bf95 | 5009 | if (fe_sjlj) |
e84314dd EB |
5010 | { |
5011 | gnu_expr = build_call_n_expr (set_jmpbuf_decl, 1, | |
5012 | build_unary_op (ADDR_EXPR, NULL_TREE, | |
5013 | gnu_jmpbuf_decl)); | |
5014 | set_expr_location_from_node (gnu_expr, gnat_node); | |
5015 | add_stmt (gnu_expr); | |
5016 | } | |
a1ab4c31 AC |
5017 | |
5018 | if (Present (First_Real_Statement (gnat_node))) | |
5019 | process_decls (Statements (gnat_node), Empty, | |
5020 | First_Real_Statement (gnat_node), true, true); | |
5021 | ||
5022 | /* Generate code for each statement in the block. */ | |
5023 | for (gnat_temp = (Present (First_Real_Statement (gnat_node)) | |
5024 | ? First_Real_Statement (gnat_node) | |
5025 | : First (Statements (gnat_node))); | |
5026 | Present (gnat_temp); gnat_temp = Next (gnat_temp)) | |
5027 | add_stmt (gnat_to_gnu (gnat_temp)); | |
5028 | gnu_inner_block = end_stmt_group (); | |
5029 | ||
5030 | /* Now generate code for the two exception models, if either is relevant for | |
5031 | this block. */ | |
0ab0bf95 | 5032 | if (fe_sjlj) |
a1ab4c31 AC |
5033 | { |
5034 | tree *gnu_else_ptr = 0; | |
5035 | tree gnu_handler; | |
5036 | ||
5037 | /* Make a binding level for the exception handling declarations and code | |
5038 | and set up gnu_except_ptr_stack for the handlers to use. */ | |
5039 | start_stmt_group (); | |
5040 | gnat_pushlevel (); | |
5041 | ||
b16b6cc9 | 5042 | vec_safe_push (gnu_except_ptr_stack, |
a10623fb | 5043 | create_var_decl (get_identifier ("EXCEPT_PTR"), NULL_TREE, |
b4f73deb | 5044 | build_pointer_type (except_type_node), |
dddf8120 | 5045 | build_call_n_expr (get_excptr_decl, 0), |
2056c5ed EB |
5046 | false, false, false, false, false, |
5047 | true, false, NULL, gnat_node)); | |
a1ab4c31 AC |
5048 | |
5049 | /* Generate code for each handler. The N_Exception_Handler case does the | |
5050 | real work and returns a COND_EXPR for each handler, which we chain | |
5051 | together here. */ | |
5052 | for (gnat_temp = First_Non_Pragma (Exception_Handlers (gnat_node)); | |
5053 | Present (gnat_temp); gnat_temp = Next_Non_Pragma (gnat_temp)) | |
5054 | { | |
5055 | gnu_expr = gnat_to_gnu (gnat_temp); | |
5056 | ||
5057 | /* If this is the first one, set it as the outer one. Otherwise, | |
5058 | point the "else" part of the previous handler to us. Then point | |
5059 | to our "else" part. */ | |
5060 | if (!gnu_else_ptr) | |
5061 | add_stmt (gnu_expr); | |
5062 | else | |
5063 | *gnu_else_ptr = gnu_expr; | |
5064 | ||
5065 | gnu_else_ptr = &COND_EXPR_ELSE (gnu_expr); | |
5066 | } | |
5067 | ||
5068 | /* If none of the exception handlers did anything, re-raise but do not | |
5069 | defer abortion. */ | |
dddf8120 | 5070 | gnu_expr = build_call_n_expr (raise_nodefer_decl, 1, |
9771b263 | 5071 | gnu_except_ptr_stack->last ()); |
4fd263a6 OH |
5072 | set_expr_location_from_node |
5073 | (gnu_expr, | |
5074 | Present (End_Label (gnat_node)) ? End_Label (gnat_node) : gnat_node); | |
a1ab4c31 AC |
5075 | |
5076 | if (gnu_else_ptr) | |
5077 | *gnu_else_ptr = gnu_expr; | |
5078 | else | |
5079 | add_stmt (gnu_expr); | |
5080 | ||
5081 | /* End the binding level dedicated to the exception handlers and get the | |
5082 | whole statement group. */ | |
9771b263 | 5083 | gnu_except_ptr_stack->pop (); |
a1ab4c31 AC |
5084 | gnat_poplevel (); |
5085 | gnu_handler = end_stmt_group (); | |
5086 | ||
5087 | /* If the setjmp returns 1, we restore our incoming longjmp value and | |
5088 | then check the handlers. */ | |
5089 | start_stmt_group (); | |
dddf8120 | 5090 | add_stmt_with_node (build_call_n_expr (set_jmpbuf_decl, 1, |
a1ab4c31 AC |
5091 | gnu_jmpsave_decl), |
5092 | gnat_node); | |
5093 | add_stmt (gnu_handler); | |
5094 | gnu_handler = end_stmt_group (); | |
5095 | ||
5096 | /* This block is now "if (setjmp) ... <handlers> else <block>". */ | |
5097 | gnu_result = build3 (COND_EXPR, void_type_node, | |
dddf8120 EB |
5098 | (build_call_n_expr |
5099 | (setjmp_decl, 1, | |
a1ab4c31 AC |
5100 | build_unary_op (ADDR_EXPR, NULL_TREE, |
5101 | gnu_jmpbuf_decl))), | |
5102 | gnu_handler, gnu_inner_block); | |
5103 | } | |
0ab0bf95 | 5104 | else if (gcc_eh) |
a1ab4c31 AC |
5105 | { |
5106 | tree gnu_handlers; | |
678400b3 | 5107 | location_t locus; |
a1ab4c31 AC |
5108 | |
5109 | /* First make a block containing the handlers. */ | |
5110 | start_stmt_group (); | |
5111 | for (gnat_temp = First_Non_Pragma (Exception_Handlers (gnat_node)); | |
5112 | Present (gnat_temp); | |
5113 | gnat_temp = Next_Non_Pragma (gnat_temp)) | |
5114 | add_stmt (gnat_to_gnu (gnat_temp)); | |
5115 | gnu_handlers = end_stmt_group (); | |
5116 | ||
5117 | /* Now make the TRY_CATCH_EXPR for the block. */ | |
5118 | gnu_result = build2 (TRY_CATCH_EXPR, void_type_node, | |
5119 | gnu_inner_block, gnu_handlers); | |
362db0b2 | 5120 | /* Set a location. We need to find a unique location for the dispatching |
678400b3 AC |
5121 | code, otherwise we can get coverage or debugging issues. Try with |
5122 | the location of the end label. */ | |
5123 | if (Present (End_Label (gnat_node)) | |
5124 | && Sloc_to_locus (Sloc (End_Label (gnat_node)), &locus)) | |
5125 | SET_EXPR_LOCATION (gnu_result, locus); | |
5126 | else | |
362db0b2 TQ |
5127 | /* Clear column information so that the exception handler of an |
5128 | implicit transient block does not incorrectly inherit the slocs | |
5129 | of a decision, which would otherwise confuse control flow based | |
5130 | coverage analysis tools. */ | |
ba464315 | 5131 | set_expr_location_from_node (gnu_result, gnat_node, true); |
a1ab4c31 AC |
5132 | } |
5133 | else | |
5134 | gnu_result = gnu_inner_block; | |
5135 | ||
5136 | /* Now close our outer block, if we had to make one. */ | |
5137 | if (binding_for_block) | |
5138 | { | |
5139 | add_stmt (gnu_result); | |
5140 | gnat_poplevel (); | |
5141 | gnu_result = end_stmt_group (); | |
5142 | } | |
5143 | ||
5144 | return gnu_result; | |
5145 | } | |
5146 | \f | |
5147 | /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Exception_Handler, | |
0ab0bf95 | 5148 | to a GCC tree, which is returned. This is the variant for front-end sjlj |
a1ab4c31 AC |
5149 | exception handling. */ |
5150 | ||
5151 | static tree | |
0ab0bf95 | 5152 | Exception_Handler_to_gnu_fe_sjlj (Node_Id gnat_node) |
a1ab4c31 AC |
5153 | { |
5154 | /* Unless this is "Others" or the special "Non-Ada" exception for Ada, make | |
5155 | an "if" statement to select the proper exceptions. For "Others", exclude | |
5156 | exceptions where Handled_By_Others is nonzero unless the All_Others flag | |
5157 | is set. For "Non-ada", accept an exception if "Lang" is 'V'. */ | |
bf6490b5 | 5158 | tree gnu_choice = boolean_false_node; |
a1ab4c31 AC |
5159 | tree gnu_body = build_stmt_group (Statements (gnat_node), false); |
5160 | Node_Id gnat_temp; | |
5161 | ||
5162 | for (gnat_temp = First (Exception_Choices (gnat_node)); | |
5163 | gnat_temp; gnat_temp = Next (gnat_temp)) | |
5164 | { | |
5165 | tree this_choice; | |
5166 | ||
5167 | if (Nkind (gnat_temp) == N_Others_Choice) | |
5168 | { | |
5169 | if (All_Others (gnat_temp)) | |
bf6490b5 | 5170 | this_choice = boolean_true_node; |
a1ab4c31 AC |
5171 | else |
5172 | this_choice | |
5173 | = build_binary_op | |
1139f2e8 | 5174 | (EQ_EXPR, boolean_type_node, |
a1ab4c31 AC |
5175 | convert |
5176 | (integer_type_node, | |
5177 | build_component_ref | |
5178 | (build_unary_op | |
5179 | (INDIRECT_REF, NULL_TREE, | |
9771b263 | 5180 | gnu_except_ptr_stack->last ()), |
64235766 | 5181 | not_handled_by_others_decl, |
a1ab4c31 AC |
5182 | false)), |
5183 | integer_zero_node); | |
5184 | } | |
5185 | ||
5186 | else if (Nkind (gnat_temp) == N_Identifier | |
5187 | || Nkind (gnat_temp) == N_Expanded_Name) | |
5188 | { | |
5189 | Entity_Id gnat_ex_id = Entity (gnat_temp); | |
5190 | tree gnu_expr; | |
5191 | ||
5192 | /* Exception may be a renaming. Recover original exception which is | |
5193 | the one elaborated and registered. */ | |
5194 | if (Present (Renamed_Object (gnat_ex_id))) | |
5195 | gnat_ex_id = Renamed_Object (gnat_ex_id); | |
5196 | ||
afc737f0 | 5197 | gnu_expr = gnat_to_gnu_entity (gnat_ex_id, NULL_TREE, false); |
a1ab4c31 AC |
5198 | |
5199 | this_choice | |
5200 | = build_binary_op | |
39f579c7 | 5201 | (EQ_EXPR, boolean_type_node, |
9771b263 DN |
5202 | gnu_except_ptr_stack->last (), |
5203 | convert (TREE_TYPE (gnu_except_ptr_stack->last ()), | |
a1ab4c31 | 5204 | build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr))); |
3f1be5be | 5205 | } |
a1ab4c31 AC |
5206 | else |
5207 | gcc_unreachable (); | |
5208 | ||
1139f2e8 | 5209 | gnu_choice = build_binary_op (TRUTH_ORIF_EXPR, boolean_type_node, |
a1ab4c31 AC |
5210 | gnu_choice, this_choice); |
5211 | } | |
5212 | ||
5213 | return build3 (COND_EXPR, void_type_node, gnu_choice, gnu_body, NULL_TREE); | |
5214 | } | |
5215 | \f | |
5216 | /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Exception_Handler, | |
0ab0bf95 OH |
5217 | to a GCC tree, which is returned. This is the variant for GCC exception |
5218 | schemes. */ | |
a1ab4c31 AC |
5219 | |
5220 | static tree | |
0ab0bf95 | 5221 | Exception_Handler_to_gnu_gcc (Node_Id gnat_node) |
a1ab4c31 AC |
5222 | { |
5223 | tree gnu_etypes_list = NULL_TREE; | |
fd6e497e | 5224 | tree gnu_current_exc_ptr, prev_gnu_incoming_exc_ptr; |
a1ab4c31 AC |
5225 | Node_Id gnat_temp; |
5226 | ||
5227 | /* We build a TREE_LIST of nodes representing what exception types this | |
5228 | handler can catch, with special cases for others and all others cases. | |
5229 | ||
5230 | Each exception type is actually identified by a pointer to the exception | |
1a710808 | 5231 | id, or to a dummy object for "others" and "all others". */ |
a1ab4c31 AC |
5232 | for (gnat_temp = First (Exception_Choices (gnat_node)); |
5233 | gnat_temp; gnat_temp = Next (gnat_temp)) | |
5234 | { | |
fd6e497e EB |
5235 | tree gnu_expr, gnu_etype; |
5236 | ||
a1ab4c31 AC |
5237 | if (Nkind (gnat_temp) == N_Others_Choice) |
5238 | { | |
fd6e497e EB |
5239 | gnu_expr = All_Others (gnat_temp) ? all_others_decl : others_decl; |
5240 | gnu_etype = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr); | |
a1ab4c31 AC |
5241 | } |
5242 | else if (Nkind (gnat_temp) == N_Identifier | |
5243 | || Nkind (gnat_temp) == N_Expanded_Name) | |
5244 | { | |
5245 | Entity_Id gnat_ex_id = Entity (gnat_temp); | |
5246 | ||
fd6e497e | 5247 | /* Exception may be a renaming. Recover original exception which is |
a1ab4c31 AC |
5248 | the one elaborated and registered. */ |
5249 | if (Present (Renamed_Object (gnat_ex_id))) | |
5250 | gnat_ex_id = Renamed_Object (gnat_ex_id); | |
5251 | ||
afc737f0 | 5252 | gnu_expr = gnat_to_gnu_entity (gnat_ex_id, NULL_TREE, false); |
a1ab4c31 | 5253 | gnu_etype = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr); |
a1ab4c31 AC |
5254 | } |
5255 | else | |
5256 | gcc_unreachable (); | |
5257 | ||
5258 | /* The GCC interface expects NULL to be passed for catch all handlers, so | |
5259 | it would be quite tempting to set gnu_etypes_list to NULL if gnu_etype | |
5260 | is integer_zero_node. It would not work, however, because GCC's | |
5261 | notion of "catch all" is stronger than our notion of "others". Until | |
5262 | we correctly use the cleanup interface as well, doing that would | |
5263 | prevent the "all others" handlers from being seen, because nothing | |
5264 | can be caught beyond a catch all from GCC's point of view. */ | |
5265 | gnu_etypes_list = tree_cons (NULL_TREE, gnu_etype, gnu_etypes_list); | |
5266 | } | |
5267 | ||
5268 | start_stmt_group (); | |
5269 | gnat_pushlevel (); | |
5270 | ||
5271 | /* Expand a call to the begin_handler hook at the beginning of the handler, | |
5272 | and arrange for a call to the end_handler hook to occur on every possible | |
5273 | exit path. | |
5274 | ||
5275 | The hooks expect a pointer to the low level occurrence. This is required | |
5276 | for our stack management scheme because a raise inside the handler pushes | |
5277 | a new occurrence on top of the stack, which means that this top does not | |
5278 | necessarily match the occurrence this handler was dealing with. | |
5279 | ||
1d65f45c | 5280 | __builtin_eh_pointer references the exception occurrence being |
a1ab4c31 AC |
5281 | propagated. Upon handler entry, this is the exception for which the |
5282 | handler is triggered. This might not be the case upon handler exit, | |
5283 | however, as we might have a new occurrence propagated by the handler's | |
5284 | body, and the end_handler hook called as a cleanup in this context. | |
5285 | ||
5286 | We use a local variable to retrieve the incoming value at handler entry | |
5287 | time, and reuse it to feed the end_handler hook's argument at exit. */ | |
1d65f45c RH |
5288 | |
5289 | gnu_current_exc_ptr | |
e79983f4 | 5290 | = build_call_expr (builtin_decl_explicit (BUILT_IN_EH_POINTER), |
1d65f45c | 5291 | 1, integer_zero_node); |
624e1688 | 5292 | prev_gnu_incoming_exc_ptr = gnu_incoming_exc_ptr; |
c1a569ef EB |
5293 | gnu_incoming_exc_ptr |
5294 | = create_var_decl (get_identifier ("EXPTR"), NULL_TREE, | |
5295 | ptr_type_node, gnu_current_exc_ptr, | |
2056c5ed | 5296 | false, false, false, false, false, true, true, |
c1a569ef | 5297 | NULL, gnat_node); |
a1ab4c31 | 5298 | |
dddf8120 | 5299 | add_stmt_with_node (build_call_n_expr (begin_handler_decl, 1, |
a1ab4c31 AC |
5300 | gnu_incoming_exc_ptr), |
5301 | gnat_node); | |
811189d9 AC |
5302 | |
5303 | /* Declare and initialize the choice parameter, if present. */ | |
5304 | if (Present (Choice_Parameter (gnat_node))) | |
5305 | { | |
fd6e497e | 5306 | tree gnu_param |
afc737f0 | 5307 | = gnat_to_gnu_entity (Choice_Parameter (gnat_node), NULL_TREE, true); |
811189d9 AC |
5308 | |
5309 | add_stmt (build_call_n_expr | |
5310 | (set_exception_parameter_decl, 2, | |
5311 | build_unary_op (ADDR_EXPR, NULL_TREE, gnu_param), | |
5312 | gnu_incoming_exc_ptr)); | |
5313 | } | |
5314 | ||
362db0b2 TQ |
5315 | /* We don't have an End_Label at hand to set the location of the cleanup |
5316 | actions, so we use that of the exception handler itself instead. */ | |
dddf8120 | 5317 | add_cleanup (build_call_n_expr (end_handler_decl, 1, gnu_incoming_exc_ptr), |
362db0b2 | 5318 | gnat_node); |
a1ab4c31 AC |
5319 | add_stmt_list (Statements (gnat_node)); |
5320 | gnat_poplevel (); | |
5321 | ||
624e1688 AC |
5322 | gnu_incoming_exc_ptr = prev_gnu_incoming_exc_ptr; |
5323 | ||
fd6e497e EB |
5324 | return |
5325 | build2 (CATCH_EXPR, void_type_node, gnu_etypes_list, end_stmt_group ()); | |
a1ab4c31 AC |
5326 | } |
5327 | \f | |
5328 | /* Subroutine of gnat_to_gnu to generate code for an N_Compilation unit. */ | |
5329 | ||
5330 | static void | |
5331 | Compilation_Unit_to_gnu (Node_Id gnat_node) | |
5332 | { | |
58c8f770 EB |
5333 | const Node_Id gnat_unit = Unit (gnat_node); |
5334 | const bool body_p = (Nkind (gnat_unit) == N_Package_Body | |
5335 | || Nkind (gnat_unit) == N_Subprogram_Body); | |
5336 | const Entity_Id gnat_unit_entity = Defining_Entity (gnat_unit); | |
384e3fb1 | 5337 | Entity_Id gnat_entity; |
257e81a6 | 5338 | Node_Id gnat_pragma; |
a1ab4c31 | 5339 | /* Make the decl for the elaboration procedure. */ |
a1ab4c31 AC |
5340 | tree gnu_elab_proc_decl |
5341 | = create_subprog_decl | |
58c8f770 | 5342 | (create_concat_name (gnat_unit_entity, body_p ? "elabb" : "elabs"), |
2056c5ed | 5343 | NULL_TREE, void_ftype, NULL_TREE, |
1e55d29a | 5344 | is_disabled, true, false, true, true, NULL, gnat_unit); |
a1ab4c31 AC |
5345 | struct elab_info *info; |
5346 | ||
9771b263 | 5347 | vec_safe_push (gnu_elab_proc_stack, gnu_elab_proc_decl); |
a1ab4c31 | 5348 | DECL_ELABORATION_PROC_P (gnu_elab_proc_decl) = 1; |
58c8f770 EB |
5349 | |
5350 | /* Initialize the information structure for the function. */ | |
a1ab4c31 | 5351 | allocate_struct_function (gnu_elab_proc_decl, false); |
a1ab4c31 | 5352 | set_cfun (NULL); |
58c8f770 EB |
5353 | |
5354 | current_function_decl = NULL_TREE; | |
5355 | ||
a09d56d8 EB |
5356 | start_stmt_group (); |
5357 | gnat_pushlevel (); | |
a1ab4c31 | 5358 | |
1e17ef87 | 5359 | /* For a body, first process the spec if there is one. */ |
6ddf9843 EB |
5360 | if (Nkind (gnat_unit) == N_Package_Body |
5361 | || (Nkind (gnat_unit) == N_Subprogram_Body && !Acts_As_Spec (gnat_node))) | |
5362 | add_stmt (gnat_to_gnu (Library_Unit (gnat_node))); | |
a1ab4c31 | 5363 | |
5daed84a EB |
5364 | if (type_annotate_only && gnat_node == Cunit (Main_Unit)) |
5365 | { | |
5366 | elaborate_all_entities (gnat_node); | |
5367 | ||
6ddf9843 EB |
5368 | if (Nkind (gnat_unit) == N_Subprogram_Declaration |
5369 | || Nkind (gnat_unit) == N_Generic_Package_Declaration | |
5370 | || Nkind (gnat_unit) == N_Generic_Subprogram_Declaration) | |
5daed84a EB |
5371 | return; |
5372 | } | |
5373 | ||
257e81a6 EB |
5374 | /* Then process any pragmas and declarations preceding the unit. */ |
5375 | for (gnat_pragma = First (Context_Items (gnat_node)); | |
5376 | Present (gnat_pragma); | |
5377 | gnat_pragma = Next (gnat_pragma)) | |
5378 | if (Nkind (gnat_pragma) == N_Pragma) | |
5379 | add_stmt (gnat_to_gnu (gnat_pragma)); | |
5daed84a EB |
5380 | process_decls (Declarations (Aux_Decls_Node (gnat_node)), Empty, Empty, |
5381 | true, true); | |
257e81a6 EB |
5382 | |
5383 | /* Process the unit itself. */ | |
6ddf9843 | 5384 | add_stmt (gnat_to_gnu (gnat_unit)); |
5daed84a | 5385 | |
384e3fb1 JM |
5386 | /* Generate code for all the inlined subprograms. */ |
5387 | for (gnat_entity = First_Inlined_Subprogram (gnat_node); | |
5388 | Present (gnat_entity); | |
5389 | gnat_entity = Next_Inlined_Subprogram (gnat_entity)) | |
58c8f770 | 5390 | { |
384e3fb1 | 5391 | Node_Id gnat_body; |
58c8f770 | 5392 | |
384e3fb1 JM |
5393 | /* Without optimization, process only the required subprograms. */ |
5394 | if (!optimize && !Has_Pragma_Inline_Always (gnat_entity)) | |
5395 | continue; | |
58c8f770 | 5396 | |
384e3fb1 JM |
5397 | gnat_body = Parent (Declaration_Node (gnat_entity)); |
5398 | if (Nkind (gnat_body) != N_Subprogram_Body) | |
5399 | { | |
5400 | /* ??? This happens when only the spec of a package is provided. */ | |
5401 | if (No (Corresponding_Body (gnat_body))) | |
5402 | continue; | |
58c8f770 | 5403 | |
384e3fb1 JM |
5404 | gnat_body |
5405 | = Parent (Declaration_Node (Corresponding_Body (gnat_body))); | |
58c8f770 | 5406 | } |
384e3fb1 JM |
5407 | |
5408 | /* Define the entity first so we set DECL_EXTERNAL. */ | |
afc737f0 | 5409 | gnat_to_gnu_entity (gnat_entity, NULL_TREE, false); |
384e3fb1 | 5410 | add_stmt (gnat_to_gnu (gnat_body)); |
58c8f770 | 5411 | } |
a1ab4c31 | 5412 | |
a1ab4c31 AC |
5413 | /* Process any pragmas and actions following the unit. */ |
5414 | add_stmt_list (Pragmas_After (Aux_Decls_Node (gnat_node))); | |
5415 | add_stmt_list (Actions (Aux_Decls_Node (gnat_node))); | |
7b56a91b | 5416 | finalize_from_limited_with (); |
a1ab4c31 | 5417 | |
ea292448 | 5418 | /* Save away what we've made so far and finish it up. */ |
a1ab4c31 AC |
5419 | set_current_block_context (gnu_elab_proc_decl); |
5420 | gnat_poplevel (); | |
5421 | DECL_SAVED_TREE (gnu_elab_proc_decl) = end_stmt_group (); | |
2a02d090 | 5422 | set_end_locus_from_node (gnu_elab_proc_decl, gnat_unit); |
ea292448 | 5423 | gnu_elab_proc_stack->pop (); |
58c8f770 | 5424 | |
ea292448 EB |
5425 | /* Record this potential elaboration procedure for later processing. */ |
5426 | info = ggc_alloc<elab_info> (); | |
a1ab4c31 AC |
5427 | info->next = elab_info_list; |
5428 | info->elab_proc = gnu_elab_proc_decl; | |
5429 | info->gnat_node = gnat_node; | |
5430 | elab_info_list = info; | |
5431 | ||
9a30c7c4 AC |
5432 | /* Force the processing for all nodes that remain in the queue. */ |
5433 | process_deferred_decl_context (true); | |
a1ab4c31 AC |
5434 | } |
5435 | \f | |
64235766 EB |
5436 | /* Mark COND, a boolean expression, as predicating a call to a noreturn |
5437 | function, i.e. predict that it is very likely false, and return it. | |
5438 | ||
5439 | The compiler will automatically predict the last edge leading to a call | |
5440 | to a noreturn function as very unlikely taken. This function makes it | |
5441 | possible to expand the prediction to predecessors in case the condition | |
5442 | is made up of several short-circuit operators. */ | |
5443 | ||
5444 | static tree | |
5445 | build_noreturn_cond (tree cond) | |
5446 | { | |
5447 | tree fn = builtin_decl_explicit (BUILT_IN_EXPECT); | |
5448 | tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn)); | |
5449 | tree pred_type = TREE_VALUE (arg_types); | |
5450 | tree expected_type = TREE_VALUE (TREE_CHAIN (arg_types)); | |
5451 | ||
5452 | tree t = build_call_expr (fn, 3, | |
5453 | fold_convert (pred_type, cond), | |
5454 | build_int_cst (expected_type, 0), | |
5455 | build_int_cst (integer_type_node, | |
5456 | PRED_NORETURN)); | |
5457 | ||
5458 | return build1 (NOP_EXPR, boolean_type_node, t); | |
5459 | } | |
5460 | ||
3eaec285 EB |
5461 | /* Subroutine of gnat_to_gnu to translate GNAT_RANGE, a node representing a |
5462 | range of values, into GNU_LOW and GNU_HIGH bounds. */ | |
5463 | ||
5464 | static void | |
5465 | Range_to_gnu (Node_Id gnat_range, tree *gnu_low, tree *gnu_high) | |
5466 | { | |
5467 | /* GNAT_RANGE is either an N_Range or an identifier denoting a subtype. */ | |
5468 | switch (Nkind (gnat_range)) | |
5469 | { | |
5470 | case N_Range: | |
5471 | *gnu_low = gnat_to_gnu (Low_Bound (gnat_range)); | |
5472 | *gnu_high = gnat_to_gnu (High_Bound (gnat_range)); | |
5473 | break; | |
5474 | ||
5475 | case N_Expanded_Name: | |
5476 | case N_Identifier: | |
5477 | { | |
5478 | tree gnu_range_type = get_unpadded_type (Entity (gnat_range)); | |
5479 | tree gnu_range_base_type = get_base_type (gnu_range_type); | |
5480 | ||
5481 | *gnu_low | |
5482 | = convert (gnu_range_base_type, TYPE_MIN_VALUE (gnu_range_type)); | |
5483 | *gnu_high | |
5484 | = convert (gnu_range_base_type, TYPE_MAX_VALUE (gnu_range_type)); | |
5485 | } | |
5486 | break; | |
5487 | ||
5488 | default: | |
5489 | gcc_unreachable (); | |
5490 | } | |
5491 | } | |
5492 | ||
9a1bdc31 EB |
5493 | /* Subroutine of gnat_to_gnu to translate GNAT_NODE, an N_Raise_xxx_Error, |
5494 | to a GCC tree and return it. GNU_RESULT_TYPE_P is a pointer to where | |
5495 | we should place the result type. */ | |
80096613 EB |
5496 | |
5497 | static tree | |
5498 | Raise_Error_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p) | |
5499 | { | |
5500 | const Node_Kind kind = Nkind (gnat_node); | |
5501 | const int reason = UI_To_Int (Reason (gnat_node)); | |
5502 | const Node_Id gnat_cond = Condition (gnat_node); | |
5503 | const bool with_extra_info | |
5504 | = Exception_Extra_Info | |
5505 | && !No_Exception_Handlers_Set () | |
5506 | && !get_exception_label (kind); | |
5507 | tree gnu_result = NULL_TREE, gnu_cond = NULL_TREE; | |
5508 | ||
9a1bdc31 EB |
5509 | /* The following processing is not required for correctness. Its purpose is |
5510 | to give more precise error messages and to record some information. */ | |
80096613 EB |
5511 | switch (reason) |
5512 | { | |
5513 | case CE_Access_Check_Failed: | |
5514 | if (with_extra_info) | |
9a1bdc31 | 5515 | gnu_result = build_call_raise_column (reason, gnat_node, kind); |
80096613 EB |
5516 | break; |
5517 | ||
5518 | case CE_Index_Check_Failed: | |
5519 | case CE_Range_Check_Failed: | |
5520 | case CE_Invalid_Data: | |
5521 | if (Present (gnat_cond) && Nkind (gnat_cond) == N_Op_Not) | |
5522 | { | |
3eaec285 | 5523 | Node_Id gnat_index, gnat_type; |
825da0d2 | 5524 | tree gnu_type, gnu_index, gnu_low_bound, gnu_high_bound, disp; |
933a7325 | 5525 | bool neg_p; |
87ab2b04 | 5526 | struct loop_info_d *loop; |
80096613 EB |
5527 | |
5528 | switch (Nkind (Right_Opnd (gnat_cond))) | |
5529 | { | |
5530 | case N_In: | |
3eaec285 EB |
5531 | Range_to_gnu (Right_Opnd (Right_Opnd (gnat_cond)), |
5532 | &gnu_low_bound, &gnu_high_bound); | |
80096613 EB |
5533 | break; |
5534 | ||
5535 | case N_Op_Ge: | |
5536 | gnu_low_bound = gnat_to_gnu (Right_Opnd (Right_Opnd (gnat_cond))); | |
5537 | gnu_high_bound = NULL_TREE; | |
5538 | break; | |
5539 | ||
5540 | case N_Op_Le: | |
5541 | gnu_low_bound = NULL_TREE; | |
5542 | gnu_high_bound = gnat_to_gnu (Right_Opnd (Right_Opnd (gnat_cond))); | |
5543 | break; | |
5544 | ||
5545 | default: | |
5546 | goto common; | |
5547 | } | |
5548 | ||
5549 | gnat_index = Left_Opnd (Right_Opnd (gnat_cond)); | |
5550 | gnat_type = Etype (gnat_index); | |
825da0d2 | 5551 | gnu_type = maybe_character_type (get_unpadded_type (gnat_type)); |
80096613 EB |
5552 | gnu_index = gnat_to_gnu (gnat_index); |
5553 | ||
825da0d2 EB |
5554 | if (TREE_TYPE (gnu_index) != gnu_type) |
5555 | { | |
5556 | if (gnu_low_bound) | |
5557 | gnu_low_bound = convert (gnu_type, gnu_low_bound); | |
5558 | if (gnu_high_bound) | |
5559 | gnu_high_bound = convert (gnu_type, gnu_high_bound); | |
5560 | gnu_index = convert (gnu_type, gnu_index); | |
5561 | } | |
5562 | ||
80096613 EB |
5563 | if (with_extra_info |
5564 | && gnu_low_bound | |
5565 | && gnu_high_bound | |
5566 | && Known_Esize (gnat_type) | |
5567 | && UI_To_Int (Esize (gnat_type)) <= 32) | |
5568 | gnu_result | |
9a1bdc31 | 5569 | = build_call_raise_range (reason, gnat_node, kind, gnu_index, |
80096613 EB |
5570 | gnu_low_bound, gnu_high_bound); |
5571 | ||
64235766 EB |
5572 | /* If optimization is enabled and we are inside a loop, we try to |
5573 | compute invariant conditions for checks applied to the iteration | |
5574 | variable, i.e. conditions that are independent of the variable | |
5575 | and necessary in order for the checks to fail in the course of | |
5576 | some iteration. If we succeed, we consider an alternative: | |
5577 | ||
5578 | 1. If loop unswitching is enabled, we prepend these conditions | |
5579 | to the original conditions of the checks. This will make it | |
5580 | possible for the loop unswitching pass to replace the loop | |
5581 | with two loops, one of which has the checks eliminated and | |
5582 | the other has the original checks reinstated, and a prologue | |
5583 | implementing a run-time selection. The former loop will be | |
5584 | for example suitable for vectorization. | |
5585 | ||
5586 | 2. Otherwise, we instead append the conditions to the original | |
5587 | conditions of the checks. At worse, if the conditions cannot | |
5588 | be evaluated at compile time, they will be evaluated as true | |
5589 | at run time only when the checks have already failed, thus | |
5590 | contributing negatively only to the size of the executable. | |
5591 | But the hope is that these invariant conditions be evaluated | |
5592 | at compile time to false, thus taking away the entire checks | |
5593 | with them. */ | |
87ab2b04 | 5594 | if (optimize |
87ab2b04 | 5595 | && inside_loop_p () |
80096613 EB |
5596 | && (!gnu_low_bound |
5597 | || (gnu_low_bound = gnat_invariant_expr (gnu_low_bound))) | |
5598 | && (!gnu_high_bound | |
5599 | || (gnu_high_bound = gnat_invariant_expr (gnu_high_bound))) | |
933a7325 | 5600 | && (loop = find_loop_for (gnu_index, &disp, &neg_p))) |
80096613 | 5601 | { |
87ab2b04 | 5602 | struct range_check_info_d *rci = ggc_alloc<range_check_info_d> (); |
80096613 EB |
5603 | rci->low_bound = gnu_low_bound; |
5604 | rci->high_bound = gnu_high_bound; | |
933a7325 EB |
5605 | rci->disp = disp; |
5606 | rci->neg_p = neg_p; | |
825da0d2 | 5607 | rci->type = gnu_type; |
64235766 EB |
5608 | rci->inserted_cond |
5609 | = build1 (SAVE_EXPR, boolean_type_node, boolean_true_node); | |
87ab2b04 EB |
5610 | vec_safe_push (loop->checks, rci); |
5611 | loop->has_checks = true; | |
64235766 EB |
5612 | gnu_cond = build_noreturn_cond (gnat_to_gnu (gnat_cond)); |
5613 | if (flag_unswitch_loops) | |
5614 | gnu_cond = build_binary_op (TRUTH_ANDIF_EXPR, | |
5615 | boolean_type_node, | |
5616 | rci->inserted_cond, | |
5617 | gnu_cond); | |
5618 | else | |
5619 | gnu_cond = build_binary_op (TRUTH_ANDIF_EXPR, | |
5620 | boolean_type_node, | |
5621 | gnu_cond, | |
5622 | rci->inserted_cond); | |
80096613 | 5623 | } |
87ab2b04 EB |
5624 | |
5625 | /* Or else, if aggressive loop optimizations are enabled, we just | |
5626 | record that there are checks applied to iteration variables. */ | |
5627 | else if (optimize | |
5628 | && flag_aggressive_loop_optimizations | |
5629 | && inside_loop_p () | |
5630 | && (loop = find_loop_for (gnu_index))) | |
5631 | loop->has_checks = true; | |
80096613 EB |
5632 | } |
5633 | break; | |
5634 | ||
5635 | default: | |
5636 | break; | |
5637 | } | |
5638 | ||
9a1bdc31 | 5639 | /* The following processing does the common work. */ |
80096613 EB |
5640 | common: |
5641 | if (!gnu_result) | |
5642 | gnu_result = build_call_raise (reason, gnat_node, kind); | |
5643 | set_expr_location_from_node (gnu_result, gnat_node); | |
5644 | ||
9a1bdc31 EB |
5645 | *gnu_result_type_p = get_unpadded_type (Etype (gnat_node)); |
5646 | ||
80096613 EB |
5647 | /* If the type is VOID, this is a statement, so we need to generate the code |
5648 | for the call. Handle a condition, if there is one. */ | |
5649 | if (VOID_TYPE_P (*gnu_result_type_p)) | |
5650 | { | |
5651 | if (Present (gnat_cond)) | |
5652 | { | |
5653 | if (!gnu_cond) | |
5654 | gnu_cond = gnat_to_gnu (gnat_cond); | |
5655 | gnu_result = build3 (COND_EXPR, void_type_node, gnu_cond, gnu_result, | |
5656 | alloc_stmt_list ()); | |
5657 | } | |
5658 | } | |
5659 | else | |
5660 | gnu_result = build1 (NULL_EXPR, *gnu_result_type_p, gnu_result); | |
5661 | ||
5662 | return gnu_result; | |
5663 | } | |
5664 | \f | |
27ab5bd8 EB |
5665 | /* Return true if GNAT_NODE is on the LHS of an assignment or an actual |
5666 | parameter of a call. */ | |
5667 | ||
5668 | static bool | |
5669 | lhs_or_actual_p (Node_Id gnat_node) | |
5670 | { | |
5671 | Node_Id gnat_parent = Parent (gnat_node); | |
5672 | Node_Kind kind = Nkind (gnat_parent); | |
5673 | ||
5674 | if (kind == N_Assignment_Statement && Name (gnat_parent) == gnat_node) | |
5675 | return true; | |
5676 | ||
5677 | if ((kind == N_Procedure_Call_Statement || kind == N_Function_Call) | |
5678 | && Name (gnat_parent) != gnat_node) | |
5679 | return true; | |
5680 | ||
5681 | if (kind == N_Parameter_Association) | |
5682 | return true; | |
5683 | ||
5684 | return false; | |
5685 | } | |
5686 | ||
033ba5bf EB |
5687 | /* Return true if either GNAT_NODE or a view of GNAT_NODE is on the LHS |
5688 | of an assignment or an actual parameter of a call. */ | |
5689 | ||
5690 | static bool | |
5691 | present_in_lhs_or_actual_p (Node_Id gnat_node) | |
5692 | { | |
5693 | Node_Kind kind; | |
5694 | ||
5695 | if (lhs_or_actual_p (gnat_node)) | |
5696 | return true; | |
5697 | ||
5698 | kind = Nkind (Parent (gnat_node)); | |
5699 | ||
5700 | if ((kind == N_Type_Conversion || kind == N_Unchecked_Type_Conversion) | |
5701 | && lhs_or_actual_p (Parent (gnat_node))) | |
5702 | return true; | |
5703 | ||
5704 | return false; | |
5705 | } | |
5706 | ||
4f8a6678 EB |
5707 | /* Return true if GNAT_NODE, an unchecked type conversion, is a no-op as far |
5708 | as gigi is concerned. This is used to avoid conversions on the LHS. */ | |
c2efda0d EB |
5709 | |
5710 | static bool | |
4f8a6678 | 5711 | unchecked_conversion_nop (Node_Id gnat_node) |
c2efda0d EB |
5712 | { |
5713 | Entity_Id from_type, to_type; | |
5714 | ||
4f8a6678 EB |
5715 | /* The conversion must be on the LHS of an assignment or an actual parameter |
5716 | of a call. Otherwise, even if the conversion was essentially a no-op, it | |
5717 | could de facto ensure type consistency and this should be preserved. */ | |
27ab5bd8 | 5718 | if (!lhs_or_actual_p (gnat_node)) |
c2efda0d EB |
5719 | return false; |
5720 | ||
5721 | from_type = Etype (Expression (gnat_node)); | |
5722 | ||
5723 | /* We're interested in artificial conversions generated by the front-end | |
5724 | to make private types explicit, e.g. in Expand_Assign_Array. */ | |
5725 | if (!Is_Private_Type (from_type)) | |
5726 | return false; | |
5727 | ||
5728 | from_type = Underlying_Type (from_type); | |
5729 | to_type = Etype (gnat_node); | |
5730 | ||
5731 | /* The direct conversion to the underlying type is a no-op. */ | |
5732 | if (to_type == from_type) | |
5733 | return true; | |
5734 | ||
1a4cb227 | 5735 | /* For an array subtype, the conversion to the PAIT is a no-op. */ |
c2efda0d | 5736 | if (Ekind (from_type) == E_Array_Subtype |
1a4cb227 | 5737 | && to_type == Packed_Array_Impl_Type (from_type)) |
c2efda0d EB |
5738 | return true; |
5739 | ||
68a3eb69 EB |
5740 | /* For a record subtype, the conversion to the type is a no-op. */ |
5741 | if (Ekind (from_type) == E_Record_Subtype | |
5742 | && to_type == Etype (from_type)) | |
5743 | return true; | |
5744 | ||
c2efda0d EB |
5745 | return false; |
5746 | } | |
5747 | ||
4c335163 EB |
5748 | /* Return true if GNAT_NODE represents a statement. */ |
5749 | ||
5750 | static bool | |
5751 | statement_node_p (Node_Id gnat_node) | |
5752 | { | |
5753 | const Node_Kind kind = Nkind (gnat_node); | |
5754 | ||
5755 | if (kind == N_Label) | |
5756 | return true; | |
5757 | ||
5758 | if (IN (kind, N_Statement_Other_Than_Procedure_Call)) | |
5759 | return true; | |
5760 | ||
5761 | if (kind == N_Procedure_Call_Statement) | |
5762 | return true; | |
5763 | ||
5764 | if (IN (kind, N_Raise_xxx_Error) && Ekind (Etype (gnat_node)) == E_Void) | |
5765 | return true; | |
5766 | ||
5767 | return false; | |
5768 | } | |
5769 | ||
3f13dd77 EB |
5770 | /* This function is the driver of the GNAT to GCC tree transformation process. |
5771 | It is the entry point of the tree transformer. GNAT_NODE is the root of | |
5772 | some GNAT tree. Return the root of the corresponding GCC tree. If this | |
5773 | is an expression, return the GCC equivalent of the expression. If this | |
5774 | is a statement, return the statement or add it to the current statement | |
5775 | group, in which case anything returned is to be interpreted as occurring | |
5776 | after anything added. */ | |
a1ab4c31 AC |
5777 | |
5778 | tree | |
5779 | gnat_to_gnu (Node_Id gnat_node) | |
5780 | { | |
3f13dd77 | 5781 | const Node_Kind kind = Nkind (gnat_node); |
a1ab4c31 | 5782 | bool went_into_elab_proc = false; |
1e17ef87 | 5783 | tree gnu_result = error_mark_node; /* Default to no value. */ |
a1ab4c31 | 5784 | tree gnu_result_type = void_type_node; |
3f13dd77 | 5785 | tree gnu_expr, gnu_lhs, gnu_rhs; |
a1ab4c31 | 5786 | Node_Id gnat_temp; |
f797c2b7 | 5787 | bool sync; |
a1ab4c31 AC |
5788 | |
5789 | /* Save node number for error message and set location information. */ | |
5790 | error_gnat_node = gnat_node; | |
5791 | Sloc_to_locus (Sloc (gnat_node), &input_location); | |
5792 | ||
4c335163 EB |
5793 | /* If we are only annotating types and this node is a statement, return |
5794 | an empty statement list. */ | |
5795 | if (type_annotate_only && statement_node_p (gnat_node)) | |
a1ab4c31 AC |
5796 | return alloc_stmt_list (); |
5797 | ||
4c335163 EB |
5798 | /* If we are only annotating types and this node is a subexpression, return |
5799 | a NULL_EXPR, but filter out nodes appearing in the expressions attached | |
5800 | to packed array implementation types. */ | |
a1ab4c31 | 5801 | if (type_annotate_only |
3f13dd77 | 5802 | && IN (kind, N_Subexpr) |
4c335163 EB |
5803 | && !(((IN (kind, N_Op) && kind != N_Op_Expon) |
5804 | || kind == N_Type_Conversion) | |
5805 | && Is_Integer_Type (Etype (gnat_node))) | |
5806 | && !(kind == N_Attribute_Reference | |
5807 | && Get_Attribute_Id (Attribute_Name (gnat_node)) == Attr_Length | |
5808 | && Ekind (Etype (Prefix (gnat_node))) == E_Array_Subtype | |
5809 | && !Is_Constr_Subt_For_U_Nominal (Etype (Prefix (gnat_node)))) | |
93200f92 | 5810 | && kind != N_Expanded_Name |
3f13dd77 | 5811 | && kind != N_Identifier |
a1ab4c31 AC |
5812 | && !Compile_Time_Known_Value (gnat_node)) |
5813 | return build1 (NULL_EXPR, get_unpadded_type (Etype (gnat_node)), | |
5814 | build_call_raise (CE_Range_Check_Failed, gnat_node, | |
5815 | N_Raise_Constraint_Error)); | |
5816 | ||
4c335163 | 5817 | if ((statement_node_p (gnat_node) && kind != N_Null_Statement) |
3f13dd77 | 5818 | || kind == N_Handled_Sequence_Of_Statements |
4c335163 | 5819 | || kind == N_Implicit_Label_Declaration) |
a1ab4c31 | 5820 | { |
2231f17f EB |
5821 | tree current_elab_proc = get_elaboration_procedure (); |
5822 | ||
3f13dd77 | 5823 | /* If this is a statement and we are at top level, it must be part of |
a09d56d8 | 5824 | the elaboration procedure, so mark us as being in that procedure. */ |
a1ab4c31 AC |
5825 | if (!current_function_decl) |
5826 | { | |
2231f17f | 5827 | current_function_decl = current_elab_proc; |
a1ab4c31 AC |
5828 | went_into_elab_proc = true; |
5829 | } | |
5830 | ||
3f13dd77 EB |
5831 | /* If we are in the elaboration procedure, check if we are violating a |
5832 | No_Elaboration_Code restriction by having a statement there. Don't | |
5833 | check for a possible No_Elaboration_Code restriction violation on | |
5834 | N_Handled_Sequence_Of_Statements, as we want to signal an error on | |
a1ab4c31 AC |
5835 | every nested real statement instead. This also avoids triggering |
5836 | spurious errors on dummy (empty) sequences created by the front-end | |
5837 | for package bodies in some cases. */ | |
2231f17f | 5838 | if (current_function_decl == current_elab_proc |
4c335163 EB |
5839 | && kind != N_Handled_Sequence_Of_Statements |
5840 | && kind != N_Implicit_Label_Declaration) | |
a1ab4c31 AC |
5841 | Check_Elaboration_Code_Allowed (gnat_node); |
5842 | } | |
5843 | ||
3f13dd77 | 5844 | switch (kind) |
a1ab4c31 AC |
5845 | { |
5846 | /********************************/ | |
1e17ef87 | 5847 | /* Chapter 2: Lexical Elements */ |
a1ab4c31 AC |
5848 | /********************************/ |
5849 | ||
5850 | case N_Identifier: | |
5851 | case N_Expanded_Name: | |
5852 | case N_Operator_Symbol: | |
5853 | case N_Defining_Identifier: | |
1d4b96e0 | 5854 | case N_Defining_Operator_Symbol: |
a1ab4c31 | 5855 | gnu_result = Identifier_to_gnu (gnat_node, &gnu_result_type); |
033ba5bf | 5856 | |
f797c2b7 EB |
5857 | /* If atomic access is required on the RHS, build the atomic load. */ |
5858 | if (atomic_access_required_p (gnat_node, &sync) | |
033ba5bf | 5859 | && !present_in_lhs_or_actual_p (gnat_node)) |
f797c2b7 | 5860 | gnu_result = build_atomic_load (gnu_result, sync); |
a1ab4c31 AC |
5861 | break; |
5862 | ||
5863 | case N_Integer_Literal: | |
5864 | { | |
5865 | tree gnu_type; | |
5866 | ||
5867 | /* Get the type of the result, looking inside any padding and | |
5868 | justified modular types. Then get the value in that type. */ | |
5869 | gnu_type = gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
5870 | ||
5871 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
5872 | && TYPE_JUSTIFIED_MODULAR_P (gnu_type)) | |
5873 | gnu_type = TREE_TYPE (TYPE_FIELDS (gnu_type)); | |
5874 | ||
5875 | gnu_result = UI_To_gnu (Intval (gnat_node), gnu_type); | |
5876 | ||
5877 | /* If the result overflows (meaning it doesn't fit in its base type), | |
5878 | abort. We would like to check that the value is within the range | |
5879 | of the subtype, but that causes problems with subtypes whose usage | |
5880 | will raise Constraint_Error and with biased representation, so | |
5881 | we don't. */ | |
5882 | gcc_assert (!TREE_OVERFLOW (gnu_result)); | |
5883 | } | |
5884 | break; | |
5885 | ||
5886 | case N_Character_Literal: | |
5887 | /* If a Entity is present, it means that this was one of the | |
5888 | literals in a user-defined character type. In that case, | |
5889 | just return the value in the CONST_DECL. Otherwise, use the | |
5890 | character code. In that case, the base type should be an | |
5891 | INTEGER_TYPE, but we won't bother checking for that. */ | |
5892 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
5893 | if (Present (Entity (gnat_node))) | |
5894 | gnu_result = DECL_INITIAL (get_gnu_tree (Entity (gnat_node))); | |
5895 | else | |
5896 | gnu_result | |
9a1bdc31 EB |
5897 | = build_int_cst (gnu_result_type, |
5898 | UI_To_CC (Char_Literal_Value (gnat_node))); | |
a1ab4c31 AC |
5899 | break; |
5900 | ||
5901 | case N_Real_Literal: | |
015bee83 AC |
5902 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); |
5903 | ||
08477031 EB |
5904 | /* If this is of a fixed-point type, the value we want is the value of |
5905 | the corresponding integer. */ | |
a1ab4c31 AC |
5906 | if (IN (Ekind (Underlying_Type (Etype (gnat_node))), Fixed_Point_Kind)) |
5907 | { | |
a1ab4c31 AC |
5908 | gnu_result = UI_To_gnu (Corresponding_Integer_Value (gnat_node), |
5909 | gnu_result_type); | |
5910 | gcc_assert (!TREE_OVERFLOW (gnu_result)); | |
5911 | } | |
5912 | ||
a1ab4c31 | 5913 | else |
1e17ef87 | 5914 | { |
a1ab4c31 AC |
5915 | Ureal ur_realval = Realval (gnat_node); |
5916 | ||
08477031 EB |
5917 | /* First convert the value to a machine number if it isn't already. |
5918 | That will force the base to 2 for non-zero values and simplify | |
5919 | the rest of the logic. */ | |
015bee83 AC |
5920 | if (!Is_Machine_Number (gnat_node)) |
5921 | ur_realval | |
5922 | = Machine (Base_Type (Underlying_Type (Etype (gnat_node))), | |
5923 | ur_realval, Round_Even, gnat_node); | |
a1ab4c31 | 5924 | |
a1ab4c31 | 5925 | if (UR_Is_Zero (ur_realval)) |
9a1bdc31 | 5926 | gnu_result = build_real (gnu_result_type, dconst0); |
a1ab4c31 AC |
5927 | else |
5928 | { | |
015bee83 | 5929 | REAL_VALUE_TYPE tmp; |
a1ab4c31 | 5930 | |
08477031 | 5931 | gnu_result = UI_To_gnu (Numerator (ur_realval), gnu_result_type); |
a1ab4c31 | 5932 | |
015bee83 | 5933 | /* The base must be 2 as Machine guarantees this, so we scale |
08477031 EB |
5934 | the value, which we know can fit in the mantissa of the type |
5935 | (hence the use of that type above). */ | |
015bee83 AC |
5936 | gcc_assert (Rbase (ur_realval) == 2); |
5937 | real_ldexp (&tmp, &TREE_REAL_CST (gnu_result), | |
5938 | - UI_To_Int (Denominator (ur_realval))); | |
5939 | gnu_result = build_real (gnu_result_type, tmp); | |
a1ab4c31 AC |
5940 | } |
5941 | ||
5942 | /* Now see if we need to negate the result. Do it this way to | |
5943 | properly handle -0. */ | |
5944 | if (UR_Is_Negative (Realval (gnat_node))) | |
5945 | gnu_result | |
5946 | = build_unary_op (NEGATE_EXPR, get_base_type (gnu_result_type), | |
5947 | gnu_result); | |
5948 | } | |
5949 | ||
5950 | break; | |
5951 | ||
5952 | case N_String_Literal: | |
5953 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
5954 | if (TYPE_PRECISION (TREE_TYPE (gnu_result_type)) == HOST_BITS_PER_CHAR) | |
5955 | { | |
5956 | String_Id gnat_string = Strval (gnat_node); | |
5957 | int length = String_Length (gnat_string); | |
5958 | int i; | |
5959 | char *string; | |
5960 | if (length >= ALLOCA_THRESHOLD) | |
1e17ef87 EB |
5961 | string = XNEWVEC (char, length + 1); |
5962 | else | |
5963 | string = (char *) alloca (length + 1); | |
a1ab4c31 AC |
5964 | |
5965 | /* Build the string with the characters in the literal. Note | |
5966 | that Ada strings are 1-origin. */ | |
5967 | for (i = 0; i < length; i++) | |
5968 | string[i] = Get_String_Char (gnat_string, i + 1); | |
5969 | ||
5970 | /* Put a null at the end of the string in case it's in a context | |
5971 | where GCC will want to treat it as a C string. */ | |
5972 | string[i] = 0; | |
5973 | ||
5974 | gnu_result = build_string (length, string); | |
5975 | ||
5976 | /* Strings in GCC don't normally have types, but we want | |
5977 | this to not be converted to the array type. */ | |
5978 | TREE_TYPE (gnu_result) = gnu_result_type; | |
5979 | ||
1e17ef87 EB |
5980 | if (length >= ALLOCA_THRESHOLD) |
5981 | free (string); | |
a1ab4c31 AC |
5982 | } |
5983 | else | |
5984 | { | |
5985 | /* Build a list consisting of each character, then make | |
5986 | the aggregate. */ | |
5987 | String_Id gnat_string = Strval (gnat_node); | |
5988 | int length = String_Length (gnat_string); | |
5989 | int i; | |
a1ab4c31 | 5990 | tree gnu_idx = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type)); |
8b9aec86 | 5991 | tree gnu_one_node = convert (TREE_TYPE (gnu_idx), integer_one_node); |
9771b263 DN |
5992 | vec<constructor_elt, va_gc> *gnu_vec; |
5993 | vec_alloc (gnu_vec, length); | |
a1ab4c31 AC |
5994 | |
5995 | for (i = 0; i < length; i++) | |
5996 | { | |
0e228dd9 NF |
5997 | tree t = build_int_cst (TREE_TYPE (gnu_result_type), |
5998 | Get_String_Char (gnat_string, i + 1)); | |
a1ab4c31 | 5999 | |
0e228dd9 | 6000 | CONSTRUCTOR_APPEND_ELT (gnu_vec, gnu_idx, t); |
8b9aec86 | 6001 | gnu_idx = int_const_binop (PLUS_EXPR, gnu_idx, gnu_one_node); |
a1ab4c31 AC |
6002 | } |
6003 | ||
0e228dd9 | 6004 | gnu_result = gnat_build_constructor (gnu_result_type, gnu_vec); |
a1ab4c31 AC |
6005 | } |
6006 | break; | |
6007 | ||
6008 | case N_Pragma: | |
6009 | gnu_result = Pragma_to_gnu (gnat_node); | |
6010 | break; | |
6011 | ||
6012 | /**************************************/ | |
1e17ef87 | 6013 | /* Chapter 3: Declarations and Types */ |
a1ab4c31 AC |
6014 | /**************************************/ |
6015 | ||
6016 | case N_Subtype_Declaration: | |
6017 | case N_Full_Type_Declaration: | |
6018 | case N_Incomplete_Type_Declaration: | |
6019 | case N_Private_Type_Declaration: | |
6020 | case N_Private_Extension_Declaration: | |
6021 | case N_Task_Type_Declaration: | |
6022 | process_type (Defining_Entity (gnat_node)); | |
6023 | gnu_result = alloc_stmt_list (); | |
6024 | break; | |
6025 | ||
6026 | case N_Object_Declaration: | |
6027 | case N_Exception_Declaration: | |
6028 | gnat_temp = Defining_Entity (gnat_node); | |
6029 | gnu_result = alloc_stmt_list (); | |
6030 | ||
6031 | /* If we are just annotating types and this object has an unconstrained | |
6032 | or task type, don't elaborate it. */ | |
6033 | if (type_annotate_only | |
6034 | && (((Is_Array_Type (Etype (gnat_temp)) | |
6035 | || Is_Record_Type (Etype (gnat_temp))) | |
6036 | && !Is_Constrained (Etype (gnat_temp))) | |
6037 | || Is_Concurrent_Type (Etype (gnat_temp)))) | |
6038 | break; | |
6039 | ||
6040 | if (Present (Expression (gnat_node)) | |
3f13dd77 | 6041 | && !(kind == N_Object_Declaration && No_Initialization (gnat_node)) |
a1ab4c31 AC |
6042 | && (!type_annotate_only |
6043 | || Compile_Time_Known_Value (Expression (gnat_node)))) | |
6044 | { | |
6045 | gnu_expr = gnat_to_gnu (Expression (gnat_node)); | |
6046 | if (Do_Range_Check (Expression (gnat_node))) | |
10069d53 EB |
6047 | gnu_expr |
6048 | = emit_range_check (gnu_expr, Etype (gnat_temp), gnat_node); | |
a1ab4c31 | 6049 | |
545b4923 EB |
6050 | if (type_annotate_only && TREE_CODE (gnu_expr) == ERROR_MARK) |
6051 | gnu_expr = NULL_TREE; | |
a1ab4c31 AC |
6052 | } |
6053 | else | |
6054 | gnu_expr = NULL_TREE; | |
6055 | ||
8df2e902 EB |
6056 | /* If this is a deferred constant with an address clause, we ignore the |
6057 | full view since the clause is on the partial view and we cannot have | |
6058 | 2 different GCC trees for the object. The only bits of the full view | |
6059 | we will use is the initializer, but it will be directly fetched. */ | |
7c775aca | 6060 | if (Ekind (gnat_temp) == E_Constant |
8df2e902 EB |
6061 | && Present (Address_Clause (gnat_temp)) |
6062 | && Present (Full_View (gnat_temp))) | |
6063 | save_gnu_tree (Full_View (gnat_temp), error_mark_node, true); | |
6064 | ||
545b4923 EB |
6065 | /* If this object has its elaboration delayed, we must force evaluation |
6066 | of GNU_EXPR now and save it for the freeze point. Note that we need | |
6067 | not do anything special at the global level since the lifetime of the | |
6068 | temporary is fully contained within the elaboration routine. */ | |
6069 | if (Present (Freeze_Node (gnat_temp))) | |
6070 | { | |
6071 | if (gnu_expr) | |
6072 | { | |
6073 | gnu_result = gnat_save_expr (gnu_expr); | |
6074 | save_gnu_tree (gnat_node, gnu_result, true); | |
6075 | } | |
6076 | } | |
6077 | else | |
afc737f0 | 6078 | gnat_to_gnu_entity (gnat_temp, gnu_expr, true); |
a1ab4c31 AC |
6079 | break; |
6080 | ||
6081 | case N_Object_Renaming_Declaration: | |
6082 | gnat_temp = Defining_Entity (gnat_node); | |
ea292448 | 6083 | gnu_result = alloc_stmt_list (); |
a1ab4c31 AC |
6084 | |
6085 | /* Don't do anything if this renaming is handled by the front end or if | |
6086 | we are just annotating types and this object has a composite or task | |
f797c2b7 | 6087 | type, don't elaborate it. */ |
a1ab4c31 AC |
6088 | if (!Is_Renaming_Of_Object (gnat_temp) |
6089 | && ! (type_annotate_only | |
6090 | && (Is_Array_Type (Etype (gnat_temp)) | |
6091 | || Is_Record_Type (Etype (gnat_temp)) | |
6092 | || Is_Concurrent_Type (Etype (gnat_temp))))) | |
ea292448 EB |
6093 | { |
6094 | tree gnu_temp | |
6095 | = gnat_to_gnu_entity (gnat_temp, | |
afc737f0 EB |
6096 | gnat_to_gnu (Renamed_Object (gnat_temp)), |
6097 | true); | |
241125b2 | 6098 | /* See case 2 of renaming in gnat_to_gnu_entity. */ |
f797c2b7 EB |
6099 | if (TREE_SIDE_EFFECTS (gnu_temp)) |
6100 | gnu_result = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_temp); | |
ea292448 | 6101 | } |
a1ab4c31 AC |
6102 | break; |
6103 | ||
ac43e11e AC |
6104 | case N_Exception_Renaming_Declaration: |
6105 | gnat_temp = Defining_Entity (gnat_node); | |
ea292448 EB |
6106 | gnu_result = alloc_stmt_list (); |
6107 | ||
6108 | /* See the above case for the rationale. */ | |
6109 | if (Present (Renamed_Entity (gnat_temp))) | |
6110 | { | |
6111 | tree gnu_temp | |
6112 | = gnat_to_gnu_entity (gnat_temp, | |
afc737f0 EB |
6113 | gnat_to_gnu (Renamed_Entity (gnat_temp)), |
6114 | true); | |
f797c2b7 EB |
6115 | if (TREE_SIDE_EFFECTS (gnu_temp)) |
6116 | gnu_result = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_temp); | |
ea292448 | 6117 | } |
ac43e11e AC |
6118 | break; |
6119 | ||
1d4b96e0 AC |
6120 | case N_Subprogram_Renaming_Declaration: |
6121 | { | |
6122 | const Node_Id gnat_renaming = Defining_Entity (gnat_node); | |
6123 | const Node_Id gnat_renamed = Renamed_Entity (gnat_renaming); | |
6124 | ||
6125 | gnu_result = alloc_stmt_list (); | |
6126 | ||
6127 | /* Materializing renamed subprograms will only benefit the debugging | |
6128 | information as they aren't referenced in the generated code. So | |
6129 | skip them when they aren't needed. Avoid doing this if: | |
6130 | ||
6131 | - there is a freeze node: in this case the renamed entity is not | |
16f19962 | 6132 | elaborated yet, |
1d4b96e0 AC |
6133 | - the renamed subprogram is intrinsic: it will not be available in |
6134 | the debugging information (note that both or only one of the | |
6135 | renaming and the renamed subprograms can be intrinsic). */ | |
16f19962 | 6136 | if (!type_annotate_only |
1d4b96e0 | 6137 | && Needs_Debug_Info (gnat_renaming) |
16f19962 | 6138 | && No (Freeze_Node (gnat_renaming)) |
1d4b96e0 AC |
6139 | && Present (gnat_renamed) |
6140 | && (Ekind (gnat_renamed) == E_Function | |
6141 | || Ekind (gnat_renamed) == E_Procedure) | |
6142 | && !Is_Intrinsic_Subprogram (gnat_renaming) | |
6143 | && !Is_Intrinsic_Subprogram (gnat_renamed)) | |
afc737f0 | 6144 | gnat_to_gnu_entity (gnat_renaming, gnat_to_gnu (gnat_renamed), true); |
1d4b96e0 AC |
6145 | break; |
6146 | } | |
6147 | ||
a1ab4c31 | 6148 | case N_Implicit_Label_Declaration: |
afc737f0 | 6149 | gnat_to_gnu_entity (Defining_Entity (gnat_node), NULL_TREE, true); |
a1ab4c31 AC |
6150 | gnu_result = alloc_stmt_list (); |
6151 | break; | |
6152 | ||
a1ab4c31 | 6153 | case N_Number_Declaration: |
ac43e11e | 6154 | case N_Package_Renaming_Declaration: |
a1ab4c31 | 6155 | /* These are fully handled in the front end. */ |
ac43e11e AC |
6156 | /* ??? For package renamings, find a way to use GENERIC namespaces so |
6157 | that we get proper debug information for them. */ | |
a1ab4c31 AC |
6158 | gnu_result = alloc_stmt_list (); |
6159 | break; | |
6160 | ||
6161 | /*************************************/ | |
1e17ef87 | 6162 | /* Chapter 4: Names and Expressions */ |
a1ab4c31 AC |
6163 | /*************************************/ |
6164 | ||
6165 | case N_Explicit_Dereference: | |
6166 | gnu_result = gnat_to_gnu (Prefix (gnat_node)); | |
6167 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
6168 | gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result); | |
033ba5bf | 6169 | |
f797c2b7 EB |
6170 | /* If atomic access is required on the RHS, build the atomic load. */ |
6171 | if (atomic_access_required_p (gnat_node, &sync) | |
033ba5bf | 6172 | && !present_in_lhs_or_actual_p (gnat_node)) |
f797c2b7 | 6173 | gnu_result = build_atomic_load (gnu_result, sync); |
a1ab4c31 AC |
6174 | break; |
6175 | ||
6176 | case N_Indexed_Component: | |
6177 | { | |
6178 | tree gnu_array_object = gnat_to_gnu (Prefix (gnat_node)); | |
6179 | tree gnu_type; | |
6180 | int ndim; | |
6181 | int i; | |
6182 | Node_Id *gnat_expr_array; | |
6183 | ||
6184 | gnu_array_object = maybe_implicit_deref (gnu_array_object); | |
7948ae37 OH |
6185 | |
6186 | /* Convert vector inputs to their representative array type, to fit | |
6187 | what the code below expects. */ | |
f71d5704 EB |
6188 | if (VECTOR_TYPE_P (TREE_TYPE (gnu_array_object))) |
6189 | { | |
6190 | if (present_in_lhs_or_actual_p (gnat_node)) | |
6191 | gnat_mark_addressable (gnu_array_object); | |
6192 | gnu_array_object = maybe_vector_array (gnu_array_object); | |
6193 | } | |
7948ae37 | 6194 | |
a1ab4c31 AC |
6195 | gnu_array_object = maybe_unconstrained_array (gnu_array_object); |
6196 | ||
6197 | /* If we got a padded type, remove it too. */ | |
315cff15 | 6198 | if (TYPE_IS_PADDING_P (TREE_TYPE (gnu_array_object))) |
a1ab4c31 AC |
6199 | gnu_array_object |
6200 | = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_array_object))), | |
6201 | gnu_array_object); | |
6202 | ||
54441a34 EB |
6203 | /* The failure of this assertion will very likely come from a missing |
6204 | expansion for a packed array access. */ | |
6205 | gcc_assert (TREE_CODE (TREE_TYPE (gnu_array_object)) == ARRAY_TYPE); | |
6206 | ||
a1ab4c31 AC |
6207 | /* First compute the number of dimensions of the array, then |
6208 | fill the expression array, the order depending on whether | |
6209 | this is a Convention_Fortran array or not. */ | |
6210 | for (ndim = 1, gnu_type = TREE_TYPE (gnu_array_object); | |
6211 | TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE | |
6212 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)); | |
6213 | ndim++, gnu_type = TREE_TYPE (gnu_type)) | |
6214 | ; | |
6215 | ||
2bb1fc26 | 6216 | gnat_expr_array = XALLOCAVEC (Node_Id, ndim); |
a1ab4c31 AC |
6217 | |
6218 | if (TYPE_CONVENTION_FORTRAN_P (TREE_TYPE (gnu_array_object))) | |
6219 | for (i = ndim - 1, gnat_temp = First (Expressions (gnat_node)); | |
6220 | i >= 0; | |
6221 | i--, gnat_temp = Next (gnat_temp)) | |
6222 | gnat_expr_array[i] = gnat_temp; | |
6223 | else | |
6224 | for (i = 0, gnat_temp = First (Expressions (gnat_node)); | |
6225 | i < ndim; | |
6226 | i++, gnat_temp = Next (gnat_temp)) | |
6227 | gnat_expr_array[i] = gnat_temp; | |
6228 | ||
825da0d2 EB |
6229 | /* Start with the prefix and build the successive references. */ |
6230 | gnu_result = gnu_array_object; | |
6231 | ||
a1ab4c31 | 6232 | for (i = 0, gnu_type = TREE_TYPE (gnu_array_object); |
87ab2b04 EB |
6233 | i < ndim; |
6234 | i++, gnu_type = TREE_TYPE (gnu_type)) | |
a1ab4c31 AC |
6235 | { |
6236 | gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE); | |
6237 | gnat_temp = gnat_expr_array[i]; | |
825da0d2 | 6238 | gnu_expr = maybe_character_value (gnat_to_gnu (gnat_temp)); |
87ab2b04 | 6239 | struct loop_info_d *loop; |
a1ab4c31 | 6240 | |
384e3fb1 JM |
6241 | gnu_result |
6242 | = build_binary_op (ARRAY_REF, NULL_TREE, gnu_result, gnu_expr); | |
6243 | ||
6244 | /* Array accesses are bound-checked so they cannot trap, but this | |
6245 | is valid only if they are not hoisted ahead of the check. We | |
6246 | need to mark them as no-trap to get decent loop optimizations | |
6247 | in the presence of -fnon-call-exceptions, so we do it when we | |
6248 | know that the original expression had no side-effects. */ | |
6249 | if (TREE_CODE (gnu_result) == ARRAY_REF | |
6250 | && !(Nkind (gnat_temp) == N_Identifier | |
6251 | && Ekind (Entity (gnat_temp)) == E_Constant)) | |
6252 | TREE_THIS_NOTRAP (gnu_result) = 1; | |
87ab2b04 EB |
6253 | |
6254 | /* If aggressive loop optimizations are enabled, we warn for loops | |
6255 | overrunning a simple array of size 1 not at the end of a record. | |
6256 | This is aimed to catch misuses of the trailing array idiom. */ | |
6257 | if (optimize | |
6258 | && flag_aggressive_loop_optimizations | |
6259 | && inside_loop_p () | |
6260 | && TREE_CODE (TREE_TYPE (gnu_type)) != ARRAY_TYPE | |
6261 | && TREE_CODE (gnu_array_object) != ARRAY_REF | |
6262 | && tree_int_cst_equal (TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_type)), | |
6263 | TYPE_MAX_VALUE (TYPE_DOMAIN (gnu_type))) | |
6264 | && !array_at_struct_end_p (gnu_result) | |
933a7325 | 6265 | && (loop = find_loop_for (gnu_expr)) |
87ab2b04 EB |
6266 | && !loop->artificial |
6267 | && !loop->has_checks | |
6268 | && tree_int_cst_equal (TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_type)), | |
6269 | loop->low_bound) | |
6270 | && can_be_lower_p (loop->low_bound, loop->high_bound) | |
6271 | && !loop->warned_aggressive_loop_optimizations | |
6272 | && warning (OPT_Waggressive_loop_optimizations, | |
6273 | "out-of-bounds access may be optimized away")) | |
6274 | { | |
6275 | inform (EXPR_LOCATION (loop->stmt), "containing loop"); | |
6276 | loop->warned_aggressive_loop_optimizations = true; | |
6277 | } | |
a1ab4c31 | 6278 | } |
a1ab4c31 | 6279 | |
033ba5bf EB |
6280 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); |
6281 | ||
f797c2b7 EB |
6282 | /* If atomic access is required on the RHS, build the atomic load. */ |
6283 | if (atomic_access_required_p (gnat_node, &sync) | |
033ba5bf | 6284 | && !present_in_lhs_or_actual_p (gnat_node)) |
f797c2b7 | 6285 | gnu_result = build_atomic_load (gnu_result, sync); |
033ba5bf | 6286 | } |
a1ab4c31 AC |
6287 | break; |
6288 | ||
6289 | case N_Slice: | |
6290 | { | |
825da0d2 | 6291 | tree gnu_array_object = gnat_to_gnu (Prefix (gnat_node)); |
a1ab4c31 | 6292 | |
a1ab4c31 AC |
6293 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); |
6294 | ||
825da0d2 EB |
6295 | gnu_array_object = maybe_implicit_deref (gnu_array_object); |
6296 | gnu_array_object = maybe_unconstrained_array (gnu_array_object); | |
6297 | ||
6298 | gnu_expr = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type)); | |
6299 | gnu_expr = maybe_character_value (gnu_expr); | |
a1ab4c31 | 6300 | |
f76d6e6f EB |
6301 | /* If this is a slice with non-constant size of an array with constant |
6302 | size, set the maximum size for the allocation of temporaries. */ | |
6303 | if (!TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_result_type)) | |
825da0d2 EB |
6304 | && TREE_CONSTANT (TYPE_SIZE_UNIT (TREE_TYPE (gnu_array_object)))) |
6305 | TYPE_ARRAY_MAX_SIZE (gnu_result_type) | |
6306 | = TYPE_SIZE_UNIT (TREE_TYPE (gnu_array_object)); | |
f76d6e6f | 6307 | |
a1ab4c31 | 6308 | gnu_result = build_binary_op (ARRAY_RANGE_REF, gnu_result_type, |
825da0d2 | 6309 | gnu_array_object, gnu_expr); |
a1ab4c31 AC |
6310 | } |
6311 | break; | |
6312 | ||
6313 | case N_Selected_Component: | |
6314 | { | |
1eb58520 | 6315 | Entity_Id gnat_prefix = Prefix (gnat_node); |
a1ab4c31 | 6316 | Entity_Id gnat_field = Entity (Selector_Name (gnat_node)); |
1eb58520 | 6317 | tree gnu_prefix = gnat_to_gnu (gnat_prefix); |
a1ab4c31 AC |
6318 | tree gnu_field; |
6319 | ||
a1ab4c31 AC |
6320 | gnu_prefix = maybe_implicit_deref (gnu_prefix); |
6321 | ||
6322 | /* For discriminant references in tagged types always substitute the | |
1e17ef87 | 6323 | corresponding discriminant as the actual selected component. */ |
f10ff6cc | 6324 | if (Is_Tagged_Type (Underlying_Type (Etype (gnat_prefix)))) |
a1ab4c31 AC |
6325 | while (Present (Corresponding_Discriminant (gnat_field))) |
6326 | gnat_field = Corresponding_Discriminant (gnat_field); | |
6327 | ||
6328 | /* For discriminant references of untagged types always substitute the | |
1e17ef87 | 6329 | corresponding stored discriminant. */ |
a1ab4c31 AC |
6330 | else if (Present (Corresponding_Discriminant (gnat_field))) |
6331 | gnat_field = Original_Record_Component (gnat_field); | |
6332 | ||
6333 | /* Handle extracting the real or imaginary part of a complex. | |
6334 | The real part is the first field and the imaginary the last. */ | |
a1ab4c31 AC |
6335 | if (TREE_CODE (TREE_TYPE (gnu_prefix)) == COMPLEX_TYPE) |
6336 | gnu_result = build_unary_op (Present (Next_Entity (gnat_field)) | |
6337 | ? REALPART_EXPR : IMAGPART_EXPR, | |
6338 | NULL_TREE, gnu_prefix); | |
6339 | else | |
6340 | { | |
6341 | gnu_field = gnat_to_gnu_field_decl (gnat_field); | |
6342 | ||
a1ab4c31 | 6343 | gnu_result |
64235766 | 6344 | = build_component_ref (gnu_prefix, gnu_field, |
a1ab4c31 | 6345 | (Nkind (Parent (gnat_node)) |
3cd64bab EB |
6346 | == N_Attribute_Reference) |
6347 | && lvalue_required_for_attribute_p | |
6348 | (Parent (gnat_node))); | |
a1ab4c31 AC |
6349 | } |
6350 | ||
a1ab4c31 | 6351 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); |
033ba5bf | 6352 | |
f797c2b7 EB |
6353 | /* If atomic access is required on the RHS, build the atomic load. */ |
6354 | if (atomic_access_required_p (gnat_node, &sync) | |
033ba5bf | 6355 | && !present_in_lhs_or_actual_p (gnat_node)) |
f797c2b7 | 6356 | gnu_result = build_atomic_load (gnu_result, sync); |
a1ab4c31 AC |
6357 | } |
6358 | break; | |
6359 | ||
6360 | case N_Attribute_Reference: | |
6361 | { | |
86060344 EB |
6362 | /* The attribute designator. */ |
6363 | const int attr = Get_Attribute_Id (Attribute_Name (gnat_node)); | |
6364 | ||
6365 | /* The Elab_Spec and Elab_Body attributes are special in that Prefix | |
6366 | is a unit, not an object with a GCC equivalent. */ | |
6367 | if (attr == Attr_Elab_Spec || attr == Attr_Elab_Body) | |
6368 | return | |
6369 | create_subprog_decl (create_concat_name | |
6370 | (Entity (Prefix (gnat_node)), | |
6371 | attr == Attr_Elab_Body ? "elabb" : "elabs"), | |
0e24192c | 6372 | NULL_TREE, void_ftype, NULL_TREE, is_disabled, |
1e55d29a | 6373 | true, true, true, true, NULL, gnat_node); |
86060344 EB |
6374 | |
6375 | gnu_result = Attribute_to_gnu (gnat_node, &gnu_result_type, attr); | |
a1ab4c31 AC |
6376 | } |
6377 | break; | |
6378 | ||
6379 | case N_Reference: | |
6380 | /* Like 'Access as far as we are concerned. */ | |
6381 | gnu_result = gnat_to_gnu (Prefix (gnat_node)); | |
6382 | gnu_result = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_result); | |
6383 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
6384 | break; | |
6385 | ||
6386 | case N_Aggregate: | |
6387 | case N_Extension_Aggregate: | |
6388 | { | |
6389 | tree gnu_aggr_type; | |
6390 | ||
6391 | /* ??? It is wrong to evaluate the type now, but there doesn't | |
6392 | seem to be any other practical way of doing it. */ | |
6393 | ||
6394 | gcc_assert (!Expansion_Delayed (gnat_node)); | |
6395 | ||
6396 | gnu_aggr_type = gnu_result_type | |
6397 | = get_unpadded_type (Etype (gnat_node)); | |
6398 | ||
6399 | if (TREE_CODE (gnu_result_type) == RECORD_TYPE | |
6400 | && TYPE_CONTAINS_TEMPLATE_P (gnu_result_type)) | |
6401 | gnu_aggr_type | |
7d76717d | 6402 | = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_result_type))); |
7948ae37 OH |
6403 | else if (TREE_CODE (gnu_result_type) == VECTOR_TYPE) |
6404 | gnu_aggr_type = TYPE_REPRESENTATIVE_ARRAY (gnu_result_type); | |
a1ab4c31 AC |
6405 | |
6406 | if (Null_Record_Present (gnat_node)) | |
9771b263 DN |
6407 | gnu_result = gnat_build_constructor (gnu_aggr_type, |
6408 | NULL); | |
a1ab4c31 AC |
6409 | |
6410 | else if (TREE_CODE (gnu_aggr_type) == RECORD_TYPE | |
6411 | || TREE_CODE (gnu_aggr_type) == UNION_TYPE) | |
6412 | gnu_result | |
6413 | = assoc_to_constructor (Etype (gnat_node), | |
6414 | First (Component_Associations (gnat_node)), | |
6415 | gnu_aggr_type); | |
6416 | else if (TREE_CODE (gnu_aggr_type) == ARRAY_TYPE) | |
6417 | gnu_result = pos_to_constructor (First (Expressions (gnat_node)), | |
6418 | gnu_aggr_type, | |
6419 | Component_Type (Etype (gnat_node))); | |
6420 | else if (TREE_CODE (gnu_aggr_type) == COMPLEX_TYPE) | |
6421 | gnu_result | |
6422 | = build_binary_op | |
6423 | (COMPLEX_EXPR, gnu_aggr_type, | |
6424 | gnat_to_gnu (Expression (First | |
6425 | (Component_Associations (gnat_node)))), | |
6426 | gnat_to_gnu (Expression | |
6427 | (Next | |
6428 | (First (Component_Associations (gnat_node)))))); | |
6429 | else | |
6430 | gcc_unreachable (); | |
6431 | ||
6432 | gnu_result = convert (gnu_result_type, gnu_result); | |
6433 | } | |
6434 | break; | |
6435 | ||
6436 | case N_Null: | |
6437 | if (TARGET_VTABLE_USES_DESCRIPTORS | |
6438 | && Ekind (Etype (gnat_node)) == E_Access_Subprogram_Type | |
6439 | && Is_Dispatch_Table_Entity (Etype (gnat_node))) | |
6440 | gnu_result = null_fdesc_node; | |
6441 | else | |
6442 | gnu_result = null_pointer_node; | |
6443 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
6444 | break; | |
6445 | ||
6446 | case N_Type_Conversion: | |
6447 | case N_Qualified_Expression: | |
825da0d2 | 6448 | gnu_expr = maybe_character_value (gnat_to_gnu (Expression (gnat_node))); |
a1ab4c31 AC |
6449 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); |
6450 | ||
0029bafd EB |
6451 | /* If this is a qualified expression for a tagged type, we mark the type |
6452 | as used. Because of polymorphism, this might be the only reference to | |
6453 | the tagged type in the program while objects have it as dynamic type. | |
6454 | The debugger needs to see it to display these objects properly. */ | |
6455 | if (kind == N_Qualified_Expression && Is_Tagged_Type (Etype (gnat_node))) | |
6456 | used_types_insert (gnu_result_type); | |
6457 | ||
a1ab4c31 | 6458 | gnu_result |
825da0d2 | 6459 | = convert_with_check (Etype (gnat_node), gnu_expr, |
a1ab4c31 AC |
6460 | Do_Overflow_Check (gnat_node), |
6461 | Do_Range_Check (Expression (gnat_node)), | |
3f13dd77 | 6462 | kind == N_Type_Conversion |
10069d53 | 6463 | && Float_Truncate (gnat_node), gnat_node); |
a1ab4c31 AC |
6464 | break; |
6465 | ||
6466 | case N_Unchecked_Type_Conversion: | |
825da0d2 | 6467 | gnu_expr = maybe_character_value (gnat_to_gnu (Expression (gnat_node))); |
c2efda0d EB |
6468 | |
6469 | /* Skip further processing if the conversion is deemed a no-op. */ | |
4f8a6678 | 6470 | if (unchecked_conversion_nop (gnat_node)) |
c2efda0d | 6471 | { |
825da0d2 | 6472 | gnu_result = gnu_expr; |
c2efda0d EB |
6473 | gnu_result_type = TREE_TYPE (gnu_result); |
6474 | break; | |
6475 | } | |
6476 | ||
a1ab4c31 AC |
6477 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); |
6478 | ||
6479 | /* If the result is a pointer type, see if we are improperly | |
6480 | converting to a stricter alignment. */ | |
6481 | if (STRICT_ALIGNMENT && POINTER_TYPE_P (gnu_result_type) | |
6482 | && IN (Ekind (Etype (gnat_node)), Access_Kind)) | |
6483 | { | |
825da0d2 | 6484 | unsigned int align = known_alignment (gnu_expr); |
a1ab4c31 AC |
6485 | tree gnu_obj_type = TREE_TYPE (gnu_result_type); |
6486 | unsigned int oalign = TYPE_ALIGN (gnu_obj_type); | |
6487 | ||
6488 | if (align != 0 && align < oalign && !TYPE_ALIGN_OK (gnu_obj_type)) | |
6489 | post_error_ne_tree_2 | |
6490 | ("?source alignment (^) '< alignment of & (^)", | |
6491 | gnat_node, Designated_Type (Etype (gnat_node)), | |
6492 | size_int (align / BITS_PER_UNIT), oalign / BITS_PER_UNIT); | |
6493 | } | |
6494 | ||
6495 | /* If we are converting a descriptor to a function pointer, first | |
6496 | build the pointer. */ | |
6497 | if (TARGET_VTABLE_USES_DESCRIPTORS | |
825da0d2 | 6498 | && TREE_TYPE (gnu_expr) == fdesc_type_node |
a1ab4c31 | 6499 | && POINTER_TYPE_P (gnu_result_type)) |
825da0d2 | 6500 | gnu_expr = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr); |
a1ab4c31 | 6501 | |
825da0d2 | 6502 | gnu_result = unchecked_convert (gnu_result_type, gnu_expr, |
a1ab4c31 AC |
6503 | No_Truncation (gnat_node)); |
6504 | break; | |
6505 | ||
6506 | case N_In: | |
6507 | case N_Not_In: | |
6508 | { | |
da49a783 | 6509 | tree gnu_obj = gnat_to_gnu (Left_Opnd (gnat_node)); |
da49a783 | 6510 | tree gnu_low, gnu_high; |
a1ab4c31 | 6511 | |
3eaec285 | 6512 | Range_to_gnu (Right_Opnd (gnat_node), &gnu_low, &gnu_high); |
a1ab4c31 AC |
6513 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); |
6514 | ||
825da0d2 EB |
6515 | tree gnu_op_type = maybe_character_type (TREE_TYPE (gnu_obj)); |
6516 | if (TREE_TYPE (gnu_obj) != gnu_op_type) | |
6517 | { | |
6518 | gnu_obj = convert (gnu_op_type, gnu_obj); | |
6519 | gnu_low = convert (gnu_op_type, gnu_low); | |
6520 | gnu_high = convert (gnu_op_type, gnu_high); | |
6521 | } | |
6522 | ||
da49a783 EB |
6523 | /* If LOW and HIGH are identical, perform an equality test. Otherwise, |
6524 | ensure that GNU_OBJ is evaluated only once and perform a full range | |
6525 | test. */ | |
a1ab4c31 | 6526 | if (operand_equal_p (gnu_low, gnu_high, 0)) |
da49a783 EB |
6527 | gnu_result |
6528 | = build_binary_op (EQ_EXPR, gnu_result_type, gnu_obj, gnu_low); | |
a1ab4c31 AC |
6529 | else |
6530 | { | |
da49a783 | 6531 | tree t1, t2; |
7d7a1fe8 | 6532 | gnu_obj = gnat_protect_expr (gnu_obj); |
da49a783 EB |
6533 | t1 = build_binary_op (GE_EXPR, gnu_result_type, gnu_obj, gnu_low); |
6534 | if (EXPR_P (t1)) | |
6535 | set_expr_location_from_node (t1, gnat_node); | |
6536 | t2 = build_binary_op (LE_EXPR, gnu_result_type, gnu_obj, gnu_high); | |
6537 | if (EXPR_P (t2)) | |
6538 | set_expr_location_from_node (t2, gnat_node); | |
a1ab4c31 | 6539 | gnu_result |
da49a783 | 6540 | = build_binary_op (TRUTH_ANDIF_EXPR, gnu_result_type, t1, t2); |
a1ab4c31 AC |
6541 | } |
6542 | ||
3f13dd77 | 6543 | if (kind == N_Not_In) |
658a41ac EB |
6544 | gnu_result |
6545 | = invert_truthvalue_loc (EXPR_LOCATION (gnu_result), gnu_result); | |
a1ab4c31 AC |
6546 | } |
6547 | break; | |
6548 | ||
6549 | case N_Op_Divide: | |
6550 | gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node)); | |
6551 | gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node)); | |
6552 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
6553 | gnu_result = build_binary_op (FLOAT_TYPE_P (gnu_result_type) | |
6554 | ? RDIV_EXPR | |
6555 | : (Rounded_Result (gnat_node) | |
6556 | ? ROUND_DIV_EXPR : TRUNC_DIV_EXPR), | |
6557 | gnu_result_type, gnu_lhs, gnu_rhs); | |
6558 | break; | |
6559 | ||
9a1bdc31 EB |
6560 | case N_Op_And: |
6561 | case N_Op_Or: | |
6562 | case N_Op_Xor: | |
a1ab4c31 AC |
6563 | /* These can either be operations on booleans or on modular types. |
6564 | Fall through for boolean types since that's the way GNU_CODES is | |
6565 | set up. */ | |
43a4dd82 | 6566 | if (Is_Modular_Integer_Type (Underlying_Type (Etype (gnat_node)))) |
a1ab4c31 AC |
6567 | { |
6568 | enum tree_code code | |
3f13dd77 EB |
6569 | = (kind == N_Op_Or ? BIT_IOR_EXPR |
6570 | : kind == N_Op_And ? BIT_AND_EXPR | |
a1ab4c31 AC |
6571 | : BIT_XOR_EXPR); |
6572 | ||
6573 | gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node)); | |
6574 | gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node)); | |
6575 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
6576 | gnu_result = build_binary_op (code, gnu_result_type, | |
6577 | gnu_lhs, gnu_rhs); | |
6578 | break; | |
6579 | } | |
6580 | ||
6581 | /* ... fall through ... */ | |
6582 | ||
9a1bdc31 EB |
6583 | case N_Op_Eq: |
6584 | case N_Op_Ne: | |
6585 | case N_Op_Lt: | |
6586 | case N_Op_Le: | |
6587 | case N_Op_Gt: | |
6588 | case N_Op_Ge: | |
6589 | case N_Op_Add: | |
6590 | case N_Op_Subtract: | |
6591 | case N_Op_Multiply: | |
6592 | case N_Op_Mod: | |
6593 | case N_Op_Rem: | |
a1ab4c31 AC |
6594 | case N_Op_Rotate_Left: |
6595 | case N_Op_Rotate_Right: | |
6596 | case N_Op_Shift_Left: | |
6597 | case N_Op_Shift_Right: | |
6598 | case N_Op_Shift_Right_Arithmetic: | |
9a1bdc31 EB |
6599 | case N_And_Then: |
6600 | case N_Or_Else: | |
a1ab4c31 | 6601 | { |
3f13dd77 | 6602 | enum tree_code code = gnu_codes[kind]; |
a1ab4c31 | 6603 | bool ignore_lhs_overflow = false; |
1fc24649 | 6604 | location_t saved_location = input_location; |
a1ab4c31 AC |
6605 | tree gnu_type; |
6606 | ||
6607 | gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node)); | |
6608 | gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node)); | |
6609 | gnu_type = gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
6610 | ||
7948ae37 OH |
6611 | /* Pending generic support for efficient vector logical operations in |
6612 | GCC, convert vectors to their representative array type view and | |
6613 | fallthrough. */ | |
6614 | gnu_lhs = maybe_vector_array (gnu_lhs); | |
6615 | gnu_rhs = maybe_vector_array (gnu_rhs); | |
6616 | ||
43a4dd82 EB |
6617 | /* If this is a comparison operator, convert any references to an |
6618 | unconstrained array value into a reference to the actual array. */ | |
a1ab4c31 AC |
6619 | if (TREE_CODE_CLASS (code) == tcc_comparison) |
6620 | { | |
6621 | gnu_lhs = maybe_unconstrained_array (gnu_lhs); | |
6622 | gnu_rhs = maybe_unconstrained_array (gnu_rhs); | |
825da0d2 EB |
6623 | |
6624 | tree gnu_op_type = maybe_character_type (TREE_TYPE (gnu_lhs)); | |
6625 | if (TREE_TYPE (gnu_lhs) != gnu_op_type) | |
6626 | { | |
6627 | gnu_lhs = convert (gnu_op_type, gnu_lhs); | |
6628 | gnu_rhs = convert (gnu_op_type, gnu_rhs); | |
6629 | } | |
a1ab4c31 AC |
6630 | } |
6631 | ||
a1ab4c31 AC |
6632 | /* If this is a shift whose count is not guaranteed to be correct, |
6633 | we need to adjust the shift count. */ | |
3f13dd77 | 6634 | if (IN (kind, N_Op_Shift) && !Shift_Count_OK (gnat_node)) |
a1ab4c31 AC |
6635 | { |
6636 | tree gnu_count_type = get_base_type (TREE_TYPE (gnu_rhs)); | |
6637 | tree gnu_max_shift | |
6638 | = convert (gnu_count_type, TYPE_SIZE (gnu_type)); | |
6639 | ||
3f13dd77 | 6640 | if (kind == N_Op_Rotate_Left || kind == N_Op_Rotate_Right) |
a1ab4c31 AC |
6641 | gnu_rhs = build_binary_op (TRUNC_MOD_EXPR, gnu_count_type, |
6642 | gnu_rhs, gnu_max_shift); | |
3f13dd77 | 6643 | else if (kind == N_Op_Shift_Right_Arithmetic) |
a1ab4c31 AC |
6644 | gnu_rhs |
6645 | = build_binary_op | |
6646 | (MIN_EXPR, gnu_count_type, | |
6647 | build_binary_op (MINUS_EXPR, | |
6648 | gnu_count_type, | |
6649 | gnu_max_shift, | |
9a1bdc31 | 6650 | build_int_cst (gnu_count_type, 1)), |
a1ab4c31 AC |
6651 | gnu_rhs); |
6652 | } | |
6653 | ||
6654 | /* For right shifts, the type says what kind of shift to do, | |
6655 | so we may need to choose a different type. In this case, | |
6656 | we have to ignore integer overflow lest it propagates all | |
6657 | the way down and causes a CE to be explicitly raised. */ | |
3f13dd77 | 6658 | if (kind == N_Op_Shift_Right && !TYPE_UNSIGNED (gnu_type)) |
a1ab4c31 | 6659 | { |
9a1bdc31 | 6660 | gnu_type = gnat_unsigned_type_for (gnu_type); |
a1ab4c31 AC |
6661 | ignore_lhs_overflow = true; |
6662 | } | |
3f13dd77 | 6663 | else if (kind == N_Op_Shift_Right_Arithmetic |
a1ab4c31 AC |
6664 | && TYPE_UNSIGNED (gnu_type)) |
6665 | { | |
9a1bdc31 | 6666 | gnu_type = gnat_signed_type_for (gnu_type); |
a1ab4c31 AC |
6667 | ignore_lhs_overflow = true; |
6668 | } | |
6669 | ||
6670 | if (gnu_type != gnu_result_type) | |
6671 | { | |
6672 | tree gnu_old_lhs = gnu_lhs; | |
6673 | gnu_lhs = convert (gnu_type, gnu_lhs); | |
6674 | if (TREE_CODE (gnu_lhs) == INTEGER_CST && ignore_lhs_overflow) | |
6675 | TREE_OVERFLOW (gnu_lhs) = TREE_OVERFLOW (gnu_old_lhs); | |
6676 | gnu_rhs = convert (gnu_type, gnu_rhs); | |
6677 | } | |
6678 | ||
b666e568 GB |
6679 | /* Instead of expanding overflow checks for addition, subtraction |
6680 | and multiplication itself, the front end will leave this to | |
6681 | the back end when Backend_Overflow_Checks_On_Target is set. | |
9a1bdc31 | 6682 | As the back end itself does not know yet how to properly |
b666e568 GB |
6683 | do overflow checking, do it here. The goal is to push |
6684 | the expansions further into the back end over time. */ | |
9a1bdc31 EB |
6685 | if (Do_Overflow_Check (gnat_node) |
6686 | && Backend_Overflow_Checks_On_Target | |
6687 | && (code == PLUS_EXPR || code == MINUS_EXPR || code == MULT_EXPR) | |
b666e568 GB |
6688 | && !TYPE_UNSIGNED (gnu_type) |
6689 | && !FLOAT_TYPE_P (gnu_type)) | |
10069d53 EB |
6690 | gnu_result = build_binary_op_trapv (code, gnu_type, |
6691 | gnu_lhs, gnu_rhs, gnat_node); | |
b666e568 | 6692 | else |
1fc24649 EB |
6693 | { |
6694 | /* Some operations, e.g. comparisons of arrays, generate complex | |
6695 | trees that need to be annotated while they are being built. */ | |
6696 | input_location = saved_location; | |
6697 | gnu_result = build_binary_op (code, gnu_type, gnu_lhs, gnu_rhs); | |
6698 | } | |
a1ab4c31 AC |
6699 | |
6700 | /* If this is a logical shift with the shift count not verified, | |
6701 | we must return zero if it is too large. We cannot compensate | |
6702 | above in this case. */ | |
3f13dd77 | 6703 | if ((kind == N_Op_Shift_Left || kind == N_Op_Shift_Right) |
a1ab4c31 AC |
6704 | && !Shift_Count_OK (gnat_node)) |
6705 | gnu_result | |
6706 | = build_cond_expr | |
6707 | (gnu_type, | |
1139f2e8 | 6708 | build_binary_op (GE_EXPR, boolean_type_node, |
a1ab4c31 AC |
6709 | gnu_rhs, |
6710 | convert (TREE_TYPE (gnu_rhs), | |
6711 | TYPE_SIZE (gnu_type))), | |
9a1bdc31 | 6712 | build_int_cst (gnu_type, 0), |
a1ab4c31 AC |
6713 | gnu_result); |
6714 | } | |
6715 | break; | |
6716 | ||
9b16cb57 | 6717 | case N_If_Expression: |
a1ab4c31 | 6718 | { |
1e17ef87 EB |
6719 | tree gnu_cond = gnat_to_gnu (First (Expressions (gnat_node))); |
6720 | tree gnu_true = gnat_to_gnu (Next (First (Expressions (gnat_node)))); | |
6721 | tree gnu_false | |
6722 | = gnat_to_gnu (Next (Next (First (Expressions (gnat_node))))); | |
a1ab4c31 AC |
6723 | |
6724 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
3f13dd77 EB |
6725 | gnu_result |
6726 | = build_cond_expr (gnu_result_type, gnu_cond, gnu_true, gnu_false); | |
a1ab4c31 AC |
6727 | } |
6728 | break; | |
6729 | ||
6730 | case N_Op_Plus: | |
6731 | gnu_result = gnat_to_gnu (Right_Opnd (gnat_node)); | |
6732 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
6733 | break; | |
6734 | ||
6735 | case N_Op_Not: | |
6736 | /* This case can apply to a boolean or a modular type. | |
6737 | Fall through for a boolean operand since GNU_CODES is set | |
6738 | up to handle this. */ | |
43a4dd82 | 6739 | if (Is_Modular_Integer_Type (Underlying_Type (Etype (gnat_node)))) |
a1ab4c31 AC |
6740 | { |
6741 | gnu_expr = gnat_to_gnu (Right_Opnd (gnat_node)); | |
6742 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
6743 | gnu_result = build_unary_op (BIT_NOT_EXPR, gnu_result_type, | |
6744 | gnu_expr); | |
6745 | break; | |
6746 | } | |
6747 | ||
6748 | /* ... fall through ... */ | |
6749 | ||
9a1bdc31 EB |
6750 | case N_Op_Minus: |
6751 | case N_Op_Abs: | |
a1ab4c31 | 6752 | gnu_expr = gnat_to_gnu (Right_Opnd (gnat_node)); |
fd6e497e | 6753 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); |
a1ab4c31 | 6754 | |
b666e568 GB |
6755 | if (Do_Overflow_Check (gnat_node) |
6756 | && !TYPE_UNSIGNED (gnu_result_type) | |
6757 | && !FLOAT_TYPE_P (gnu_result_type)) | |
10069d53 | 6758 | gnu_result |
3f13dd77 | 6759 | = build_unary_op_trapv (gnu_codes[kind], |
10069d53 | 6760 | gnu_result_type, gnu_expr, gnat_node); |
b666e568 | 6761 | else |
3f13dd77 | 6762 | gnu_result = build_unary_op (gnu_codes[kind], |
b666e568 | 6763 | gnu_result_type, gnu_expr); |
a1ab4c31 AC |
6764 | break; |
6765 | ||
6766 | case N_Allocator: | |
6767 | { | |
6768 | tree gnu_init = 0; | |
6769 | tree gnu_type; | |
6770 | bool ignore_init_type = false; | |
6771 | ||
6772 | gnat_temp = Expression (gnat_node); | |
6773 | ||
6774 | /* The Expression operand can either be an N_Identifier or | |
6775 | Expanded_Name, which must represent a type, or a | |
6776 | N_Qualified_Expression, which contains both the object type and an | |
6777 | initial value for the object. */ | |
6778 | if (Nkind (gnat_temp) == N_Identifier | |
6779 | || Nkind (gnat_temp) == N_Expanded_Name) | |
6780 | gnu_type = gnat_to_gnu_type (Entity (gnat_temp)); | |
6781 | else if (Nkind (gnat_temp) == N_Qualified_Expression) | |
6782 | { | |
6783 | Entity_Id gnat_desig_type | |
6784 | = Designated_Type (Underlying_Type (Etype (gnat_node))); | |
6785 | ||
6786 | ignore_init_type = Has_Constrained_Partial_View (gnat_desig_type); | |
6787 | gnu_init = gnat_to_gnu (Expression (gnat_temp)); | |
6788 | ||
6789 | gnu_init = maybe_unconstrained_array (gnu_init); | |
1e17ef87 | 6790 | if (Do_Range_Check (Expression (gnat_temp))) |
10069d53 EB |
6791 | gnu_init |
6792 | = emit_range_check (gnu_init, gnat_desig_type, gnat_temp); | |
a1ab4c31 AC |
6793 | |
6794 | if (Is_Elementary_Type (gnat_desig_type) | |
6795 | || Is_Constrained (gnat_desig_type)) | |
0029bafd | 6796 | gnu_type = gnat_to_gnu_type (gnat_desig_type); |
a1ab4c31 AC |
6797 | else |
6798 | { | |
6799 | gnu_type = gnat_to_gnu_type (Etype (Expression (gnat_temp))); | |
6800 | if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE) | |
6801 | gnu_type = TREE_TYPE (gnu_init); | |
a1ab4c31 | 6802 | } |
0029bafd EB |
6803 | |
6804 | /* See the N_Qualified_Expression case for the rationale. */ | |
6805 | if (Is_Tagged_Type (gnat_desig_type)) | |
6806 | used_types_insert (gnu_type); | |
6807 | ||
6808 | gnu_init = convert (gnu_type, gnu_init); | |
a1ab4c31 AC |
6809 | } |
6810 | else | |
6811 | gcc_unreachable (); | |
6812 | ||
6813 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); | |
6814 | return build_allocator (gnu_type, gnu_init, gnu_result_type, | |
6815 | Procedure_To_Call (gnat_node), | |
6816 | Storage_Pool (gnat_node), gnat_node, | |
6817 | ignore_init_type); | |
6818 | } | |
6819 | break; | |
6820 | ||
1e17ef87 EB |
6821 | /**************************/ |
6822 | /* Chapter 5: Statements */ | |
6823 | /**************************/ | |
a1ab4c31 AC |
6824 | |
6825 | case N_Label: | |
6826 | gnu_result = build1 (LABEL_EXPR, void_type_node, | |
6827 | gnat_to_gnu (Identifier (gnat_node))); | |
6828 | break; | |
6829 | ||
6830 | case N_Null_Statement: | |
9c69c3af EB |
6831 | /* When not optimizing, turn null statements from source into gotos to |
6832 | the next statement that the middle-end knows how to preserve. */ | |
6833 | if (!optimize && Comes_From_Source (gnat_node)) | |
6834 | { | |
88a94e2b EB |
6835 | tree stmt, label = create_label_decl (NULL_TREE, gnat_node); |
6836 | DECL_IGNORED_P (label) = 1; | |
9c69c3af EB |
6837 | start_stmt_group (); |
6838 | stmt = build1 (GOTO_EXPR, void_type_node, label); | |
6839 | set_expr_location_from_node (stmt, gnat_node); | |
6840 | add_stmt (stmt); | |
6841 | stmt = build1 (LABEL_EXPR, void_type_node, label); | |
6842 | set_expr_location_from_node (stmt, gnat_node); | |
6843 | add_stmt (stmt); | |
6844 | gnu_result = end_stmt_group (); | |
6845 | } | |
6846 | else | |
6847 | gnu_result = alloc_stmt_list (); | |
a1ab4c31 AC |
6848 | break; |
6849 | ||
6850 | case N_Assignment_Statement: | |
6851 | /* Get the LHS and RHS of the statement and convert any reference to an | |
0b3467c4 | 6852 | unconstrained array into a reference to the underlying array. */ |
a1ab4c31 AC |
6853 | gnu_lhs = maybe_unconstrained_array (gnat_to_gnu (Name (gnat_node))); |
6854 | ||
6855 | /* If the type has a size that overflows, convert this into raise of | |
6856 | Storage_Error: execution shouldn't have gotten here anyway. */ | |
6857 | if (TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (gnu_lhs))) == INTEGER_CST | |
ce3da0d0 | 6858 | && !valid_constant_size_p (TYPE_SIZE_UNIT (TREE_TYPE (gnu_lhs)))) |
a1ab4c31 AC |
6859 | gnu_result = build_call_raise (SE_Object_Too_Large, gnat_node, |
6860 | N_Raise_Storage_Error); | |
0b3467c4 | 6861 | else if (Nkind (Expression (gnat_node)) == N_Function_Call) |
f797c2b7 EB |
6862 | { |
6863 | bool outer_atomic_access | |
6864 | = outer_atomic_access_required_p (Name (gnat_node)); | |
6865 | bool atomic_access | |
6866 | = !outer_atomic_access | |
6867 | && atomic_access_required_p (Name (gnat_node), &sync); | |
6868 | gnu_result | |
6869 | = Call_to_gnu (Expression (gnat_node), &gnu_result_type, gnu_lhs, | |
6870 | outer_atomic_access, atomic_access, sync); | |
6871 | } | |
a1ab4c31 AC |
6872 | else |
6873 | { | |
ac43e11e AC |
6874 | const Node_Id gnat_expr = Expression (gnat_node); |
6875 | const Entity_Id gnat_type | |
6876 | = Underlying_Type (Etype (Name (gnat_node))); | |
6877 | const bool regular_array_type_p | |
6878 | = (Is_Array_Type (gnat_type) && !Is_Bit_Packed_Array (gnat_type)); | |
6879 | const bool use_memset_p | |
6880 | = (regular_array_type_p | |
6881 | && Nkind (gnat_expr) == N_Aggregate | |
6882 | && Is_Others_Aggregate (gnat_expr)); | |
6883 | ||
6884 | /* If we'll use memset, we need to find the inner expression. */ | |
6885 | if (use_memset_p) | |
6886 | { | |
6887 | Node_Id gnat_inner | |
6888 | = Expression (First (Component_Associations (gnat_expr))); | |
6889 | while (Nkind (gnat_inner) == N_Aggregate | |
6890 | && Is_Others_Aggregate (gnat_inner)) | |
6891 | gnat_inner | |
6892 | = Expression (First (Component_Associations (gnat_inner))); | |
6893 | gnu_rhs = gnat_to_gnu (gnat_inner); | |
6894 | } | |
6895 | else | |
6896 | gnu_rhs = maybe_unconstrained_array (gnat_to_gnu (gnat_expr)); | |
a1ab4c31 | 6897 | |
8b659f79 | 6898 | /* If range check is needed, emit code to generate it. */ |
ac43e11e | 6899 | if (Do_Range_Check (gnat_expr)) |
10069d53 EB |
6900 | gnu_rhs = emit_range_check (gnu_rhs, Etype (Name (gnat_node)), |
6901 | gnat_node); | |
a1ab4c31 | 6902 | |
f797c2b7 EB |
6903 | /* If an outer atomic access is required on the LHS, build the load- |
6904 | modify-store sequence. */ | |
6905 | if (outer_atomic_access_required_p (Name (gnat_node))) | |
6906 | gnu_result = build_load_modify_store (gnu_lhs, gnu_rhs, gnat_node); | |
6907 | ||
6908 | /* Or else, if atomic access is required, build the atomic store. */ | |
6909 | else if (atomic_access_required_p (Name (gnat_node), &sync)) | |
6910 | gnu_result = build_atomic_store (gnu_lhs, gnu_rhs, sync); | |
ac43e11e AC |
6911 | |
6912 | /* Or else, use memset when the conditions are met. */ | |
6913 | else if (use_memset_p) | |
6914 | { | |
6915 | tree value = fold_convert (integer_type_node, gnu_rhs); | |
6916 | tree to = gnu_lhs; | |
6917 | tree type = TREE_TYPE (to); | |
6918 | tree size | |
6919 | = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TYPE_SIZE_UNIT (type), to); | |
6920 | tree to_ptr = build_fold_addr_expr (to); | |
881cdd61 | 6921 | tree t = builtin_decl_explicit (BUILT_IN_MEMSET); |
ac43e11e AC |
6922 | if (TREE_CODE (value) == INTEGER_CST) |
6923 | { | |
6924 | tree mask | |
6925 | = build_int_cst (integer_type_node, | |
6926 | ((HOST_WIDE_INT) 1 << BITS_PER_UNIT) - 1); | |
6927 | value = int_const_binop (BIT_AND_EXPR, value, mask); | |
6928 | } | |
6929 | gnu_result = build_call_expr (t, 3, to_ptr, value, size); | |
6930 | } | |
6931 | ||
6932 | /* Otherwise build a regular assignment. */ | |
033ba5bf EB |
6933 | else |
6934 | gnu_result | |
6935 | = build_binary_op (MODIFY_EXPR, NULL_TREE, gnu_lhs, gnu_rhs); | |
8b659f79 | 6936 | |
ac43e11e | 6937 | /* If the assignment type is a regular array and the two sides are |
82d6f532 EB |
6938 | not completely disjoint, play safe and use memmove. But don't do |
6939 | it for a bit-packed array as it might not be byte-aligned. */ | |
8b659f79 | 6940 | if (TREE_CODE (gnu_result) == MODIFY_EXPR |
ac43e11e | 6941 | && regular_array_type_p |
8b659f79 EB |
6942 | && !(Forwards_OK (gnat_node) && Backwards_OK (gnat_node))) |
6943 | { | |
ac43e11e AC |
6944 | tree to = TREE_OPERAND (gnu_result, 0); |
6945 | tree from = TREE_OPERAND (gnu_result, 1); | |
6946 | tree type = TREE_TYPE (from); | |
6947 | tree size | |
6948 | = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TYPE_SIZE_UNIT (type), from); | |
6949 | tree to_ptr = build_fold_addr_expr (to); | |
6950 | tree from_ptr = build_fold_addr_expr (from); | |
881cdd61 | 6951 | tree t = builtin_decl_explicit (BUILT_IN_MEMMOVE); |
8b659f79 EB |
6952 | gnu_result = build_call_expr (t, 3, to_ptr, from_ptr, size); |
6953 | } | |
a1ab4c31 AC |
6954 | } |
6955 | break; | |
6956 | ||
6957 | case N_If_Statement: | |
6958 | { | |
1e17ef87 | 6959 | tree *gnu_else_ptr; /* Point to put next "else if" or "else". */ |
a1ab4c31 AC |
6960 | |
6961 | /* Make the outer COND_EXPR. Avoid non-determinism. */ | |
6962 | gnu_result = build3 (COND_EXPR, void_type_node, | |
6963 | gnat_to_gnu (Condition (gnat_node)), | |
6964 | NULL_TREE, NULL_TREE); | |
6965 | COND_EXPR_THEN (gnu_result) | |
6966 | = build_stmt_group (Then_Statements (gnat_node), false); | |
6967 | TREE_SIDE_EFFECTS (gnu_result) = 1; | |
6968 | gnu_else_ptr = &COND_EXPR_ELSE (gnu_result); | |
6969 | ||
6970 | /* Now make a COND_EXPR for each of the "else if" parts. Put each | |
6971 | into the previous "else" part and point to where to put any | |
6972 | outer "else". Also avoid non-determinism. */ | |
6973 | if (Present (Elsif_Parts (gnat_node))) | |
6974 | for (gnat_temp = First (Elsif_Parts (gnat_node)); | |
6975 | Present (gnat_temp); gnat_temp = Next (gnat_temp)) | |
6976 | { | |
6977 | gnu_expr = build3 (COND_EXPR, void_type_node, | |
6978 | gnat_to_gnu (Condition (gnat_temp)), | |
6979 | NULL_TREE, NULL_TREE); | |
6980 | COND_EXPR_THEN (gnu_expr) | |
6981 | = build_stmt_group (Then_Statements (gnat_temp), false); | |
6982 | TREE_SIDE_EFFECTS (gnu_expr) = 1; | |
6983 | set_expr_location_from_node (gnu_expr, gnat_temp); | |
6984 | *gnu_else_ptr = gnu_expr; | |
6985 | gnu_else_ptr = &COND_EXPR_ELSE (gnu_expr); | |
6986 | } | |
6987 | ||
6988 | *gnu_else_ptr = build_stmt_group (Else_Statements (gnat_node), false); | |
6989 | } | |
6990 | break; | |
6991 | ||
6992 | case N_Case_Statement: | |
6993 | gnu_result = Case_Statement_to_gnu (gnat_node); | |
6994 | break; | |
6995 | ||
6996 | case N_Loop_Statement: | |
6997 | gnu_result = Loop_Statement_to_gnu (gnat_node); | |
6998 | break; | |
6999 | ||
7000 | case N_Block_Statement: | |
a712b009 EB |
7001 | /* The only way to enter the block is to fall through to it. */ |
7002 | if (stmt_group_may_fallthru ()) | |
7003 | { | |
7004 | start_stmt_group (); | |
7005 | gnat_pushlevel (); | |
7006 | process_decls (Declarations (gnat_node), Empty, Empty, true, true); | |
7007 | add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node))); | |
7008 | gnat_poplevel (); | |
7009 | gnu_result = end_stmt_group (); | |
7010 | } | |
7011 | else | |
7012 | gnu_result = alloc_stmt_list (); | |
a1ab4c31 AC |
7013 | break; |
7014 | ||
7015 | case N_Exit_Statement: | |
7016 | gnu_result | |
7017 | = build2 (EXIT_STMT, void_type_node, | |
7018 | (Present (Condition (gnat_node)) | |
7019 | ? gnat_to_gnu (Condition (gnat_node)) : NULL_TREE), | |
7020 | (Present (Name (gnat_node)) | |
7021 | ? get_gnu_tree (Entity (Name (gnat_node))) | |
633a3f2a | 7022 | : LOOP_STMT_LABEL (gnu_loop_stack->last ()->stmt))); |
a1ab4c31 AC |
7023 | break; |
7024 | ||
7640ef8a | 7025 | case N_Simple_Return_Statement: |
a1ab4c31 | 7026 | { |
f3d34576 | 7027 | tree gnu_ret_obj, gnu_ret_val; |
a1ab4c31 | 7028 | |
d47d0a8d EB |
7029 | /* If the subprogram is a function, we must return the expression. */ |
7030 | if (Present (Expression (gnat_node))) | |
a1ab4c31 | 7031 | { |
d47d0a8d | 7032 | tree gnu_subprog_type = TREE_TYPE (current_function_decl); |
d47d0a8d | 7033 | |
2374257a EB |
7034 | /* If this function has copy-in/copy-out parameters parameters and |
7035 | doesn't return by invisible reference, get the real object for | |
7036 | the return. See Subprogram_Body_to_gnu. */ | |
7037 | if (TYPE_CI_CO_LIST (gnu_subprog_type) | |
7038 | && !TREE_ADDRESSABLE (gnu_subprog_type)) | |
9771b263 | 7039 | gnu_ret_obj = gnu_return_var_stack->last (); |
f3d34576 EB |
7040 | else |
7041 | gnu_ret_obj = DECL_RESULT (current_function_decl); | |
7042 | ||
7043 | /* Get the GCC tree for the expression to be returned. */ | |
7044 | gnu_ret_val = gnat_to_gnu (Expression (gnat_node)); | |
35a382b8 | 7045 | |
d47d0a8d EB |
7046 | /* Do not remove the padding from GNU_RET_VAL if the inner type is |
7047 | self-referential since we want to allocate the fixed size. */ | |
7048 | if (TREE_CODE (gnu_ret_val) == COMPONENT_REF | |
fc7a823e | 7049 | && type_is_padding_self_referential |
d020df06 | 7050 | (TREE_TYPE (TREE_OPERAND (gnu_ret_val, 0)))) |
d47d0a8d EB |
7051 | gnu_ret_val = TREE_OPERAND (gnu_ret_val, 0); |
7052 | ||
f3d34576 | 7053 | /* If the function returns by direct reference, return a pointer |
d47d0a8d EB |
7054 | to the return value. */ |
7055 | if (TYPE_RETURN_BY_DIRECT_REF_P (gnu_subprog_type) | |
7056 | || By_Ref (gnat_node)) | |
7057 | gnu_ret_val = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_ret_val); | |
7058 | ||
7059 | /* Otherwise, if it returns an unconstrained array, we have to | |
7060 | allocate a new version of the result and return it. */ | |
7061 | else if (TYPE_RETURN_UNCONSTRAINED_P (gnu_subprog_type)) | |
a1ab4c31 | 7062 | { |
d47d0a8d | 7063 | gnu_ret_val = maybe_unconstrained_array (gnu_ret_val); |
088b91c7 EB |
7064 | |
7065 | /* And find out whether this is a candidate for Named Return | |
7066 | Value. If so, record it. */ | |
7067 | if (!TYPE_CI_CO_LIST (gnu_subprog_type) && optimize) | |
7068 | { | |
7069 | tree ret_val = gnu_ret_val; | |
7070 | ||
7071 | /* Strip useless conversions around the return value. */ | |
7072 | if (gnat_useless_type_conversion (ret_val)) | |
7073 | ret_val = TREE_OPERAND (ret_val, 0); | |
7074 | ||
7075 | /* Strip unpadding around the return value. */ | |
7076 | if (TREE_CODE (ret_val) == COMPONENT_REF | |
7077 | && TYPE_IS_PADDING_P | |
7078 | (TREE_TYPE (TREE_OPERAND (ret_val, 0)))) | |
7079 | ret_val = TREE_OPERAND (ret_val, 0); | |
7080 | ||
7081 | /* Now apply the test to the return value. */ | |
7082 | if (return_value_ok_for_nrv_p (NULL_TREE, ret_val)) | |
7083 | { | |
7084 | if (!f_named_ret_val) | |
7085 | f_named_ret_val = BITMAP_GGC_ALLOC (); | |
7086 | bitmap_set_bit (f_named_ret_val, DECL_UID (ret_val)); | |
7087 | if (!f_gnat_ret) | |
7088 | f_gnat_ret = gnat_node; | |
7089 | } | |
7090 | } | |
7091 | ||
d47d0a8d | 7092 | gnu_ret_val = build_allocator (TREE_TYPE (gnu_ret_val), |
f3d34576 EB |
7093 | gnu_ret_val, |
7094 | TREE_TYPE (gnu_ret_obj), | |
d47d0a8d EB |
7095 | Procedure_To_Call (gnat_node), |
7096 | Storage_Pool (gnat_node), | |
7097 | gnat_node, false); | |
a1ab4c31 | 7098 | } |
d47d0a8d | 7099 | |
0d24bf76 | 7100 | /* Otherwise, if it returns by invisible reference, dereference |
d47d0a8d EB |
7101 | the pointer it is passed using the type of the return value |
7102 | and build the copy operation manually. This ensures that we | |
7103 | don't copy too much data, for example if the return type is | |
7104 | unconstrained with a maximum size. */ | |
0d24bf76 | 7105 | else if (TREE_ADDRESSABLE (gnu_subprog_type)) |
a1ab4c31 | 7106 | { |
f3d34576 | 7107 | tree gnu_ret_deref |
d47d0a8d | 7108 | = build_unary_op (INDIRECT_REF, TREE_TYPE (gnu_ret_val), |
f3d34576 | 7109 | gnu_ret_obj); |
b24f7345 | 7110 | gnu_result = build2 (INIT_EXPR, void_type_node, |
2374257a | 7111 | gnu_ret_deref, gnu_ret_val); |
d47d0a8d EB |
7112 | add_stmt_with_node (gnu_result, gnat_node); |
7113 | gnu_ret_val = NULL_TREE; | |
a1ab4c31 AC |
7114 | } |
7115 | } | |
0d24bf76 | 7116 | |
a1ab4c31 | 7117 | else |
0d24bf76 | 7118 | gnu_ret_obj = gnu_ret_val = NULL_TREE; |
a1ab4c31 | 7119 | |
35a382b8 EB |
7120 | /* If we have a return label defined, convert this into a branch to |
7121 | that label. The return proper will be handled elsewhere. */ | |
9771b263 | 7122 | if (gnu_return_label_stack->last ()) |
35a382b8 | 7123 | { |
2374257a | 7124 | if (gnu_ret_val) |
35a382b8 EB |
7125 | add_stmt (build_binary_op (MODIFY_EXPR, NULL_TREE, gnu_ret_obj, |
7126 | gnu_ret_val)); | |
7127 | ||
7128 | gnu_result = build1 (GOTO_EXPR, void_type_node, | |
9771b263 | 7129 | gnu_return_label_stack->last ()); |
f3d34576 | 7130 | |
35a382b8 EB |
7131 | /* When not optimizing, make sure the return is preserved. */ |
7132 | if (!optimize && Comes_From_Source (gnat_node)) | |
9771b263 | 7133 | DECL_ARTIFICIAL (gnu_return_label_stack->last ()) = 0; |
35a382b8 EB |
7134 | } |
7135 | ||
f3d34576 EB |
7136 | /* Otherwise, build a regular return. */ |
7137 | else | |
7138 | gnu_result = build_return_expr (gnu_ret_obj, gnu_ret_val); | |
a1ab4c31 AC |
7139 | } |
7140 | break; | |
7141 | ||
7142 | case N_Goto_Statement: | |
0d24bf76 EB |
7143 | gnu_result |
7144 | = build1 (GOTO_EXPR, void_type_node, gnat_to_gnu (Name (gnat_node))); | |
a1ab4c31 AC |
7145 | break; |
7146 | ||
1e17ef87 EB |
7147 | /***************************/ |
7148 | /* Chapter 6: Subprograms */ | |
7149 | /***************************/ | |
a1ab4c31 AC |
7150 | |
7151 | case N_Subprogram_Declaration: | |
d5ebeb8c EB |
7152 | /* Unless there is a freeze node, declare the entity. We consider |
7153 | this a definition even though we're not generating code for the | |
7154 | subprogram because we will be making the corresponding GCC node. | |
7155 | When there is a freeze node, it is considered the definition of | |
7156 | the subprogram and we do nothing until after it is encountered. | |
7157 | That's an efficiency issue: the types involved in the profile | |
7158 | are far more likely to be frozen between the declaration and | |
7159 | the freeze node than before the declaration, so we save some | |
7160 | updates of the GCC node by waiting until the freeze node. | |
7161 | The counterpart is that we assume that there is no reference | |
7162 | to the subprogram between the declaration and the freeze node | |
7163 | in the expanded code; otherwise, it will be interpreted as an | |
7164 | external reference and very likely give rise to a link failure. */ | |
a1ab4c31 AC |
7165 | if (No (Freeze_Node (Defining_Entity (Specification (gnat_node))))) |
7166 | gnat_to_gnu_entity (Defining_Entity (Specification (gnat_node)), | |
afc737f0 | 7167 | NULL_TREE, true); |
a1ab4c31 AC |
7168 | gnu_result = alloc_stmt_list (); |
7169 | break; | |
7170 | ||
7171 | case N_Abstract_Subprogram_Declaration: | |
7172 | /* This subprogram doesn't exist for code generation purposes, but we | |
7173 | have to elaborate the types of any parameters and result, unless | |
76e3504f | 7174 | they are imported types (nothing to generate in this case). |
a1ab4c31 | 7175 | |
76e3504f AC |
7176 | The parameter list may contain types with freeze nodes, e.g. not null |
7177 | subtypes, so the subprogram itself may carry a freeze node, in which | |
7178 | case its elaboration must be deferred. */ | |
a1ab4c31 | 7179 | |
76e3504f AC |
7180 | /* Process the parameter types first. */ |
7181 | if (No (Freeze_Node (Defining_Entity (Specification (gnat_node))))) | |
a1ab4c31 AC |
7182 | for (gnat_temp |
7183 | = First_Formal_With_Extras | |
7184 | (Defining_Entity (Specification (gnat_node))); | |
7185 | Present (gnat_temp); | |
7186 | gnat_temp = Next_Formal_With_Extras (gnat_temp)) | |
7187 | if (Is_Itype (Etype (gnat_temp)) | |
7b56a91b | 7188 | && !From_Limited_With (Etype (gnat_temp))) |
afc737f0 | 7189 | gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, false); |
a1ab4c31 | 7190 | |
a1ab4c31 | 7191 | /* Then the result type, set to Standard_Void_Type for procedures. */ |
a1ab4c31 AC |
7192 | { |
7193 | Entity_Id gnat_temp_type | |
7194 | = Etype (Defining_Entity (Specification (gnat_node))); | |
7195 | ||
7b56a91b | 7196 | if (Is_Itype (gnat_temp_type) && !From_Limited_With (gnat_temp_type)) |
afc737f0 | 7197 | gnat_to_gnu_entity (Etype (gnat_temp_type), NULL_TREE, false); |
a1ab4c31 AC |
7198 | } |
7199 | ||
7200 | gnu_result = alloc_stmt_list (); | |
7201 | break; | |
7202 | ||
7203 | case N_Defining_Program_Unit_Name: | |
1e17ef87 EB |
7204 | /* For a child unit identifier go up a level to get the specification. |
7205 | We get this when we try to find the spec of a child unit package | |
7206 | that is the compilation unit being compiled. */ | |
a1ab4c31 AC |
7207 | gnu_result = gnat_to_gnu (Parent (gnat_node)); |
7208 | break; | |
7209 | ||
7210 | case N_Subprogram_Body: | |
7211 | Subprogram_Body_to_gnu (gnat_node); | |
7212 | gnu_result = alloc_stmt_list (); | |
7213 | break; | |
7214 | ||
7215 | case N_Function_Call: | |
7216 | case N_Procedure_Call_Statement: | |
f797c2b7 EB |
7217 | gnu_result = Call_to_gnu (gnat_node, &gnu_result_type, NULL_TREE, |
7218 | false, false, false); | |
a1ab4c31 AC |
7219 | break; |
7220 | ||
1e17ef87 EB |
7221 | /************************/ |
7222 | /* Chapter 7: Packages */ | |
7223 | /************************/ | |
a1ab4c31 AC |
7224 | |
7225 | case N_Package_Declaration: | |
7226 | gnu_result = gnat_to_gnu (Specification (gnat_node)); | |
7227 | break; | |
7228 | ||
7229 | case N_Package_Specification: | |
7230 | ||
7231 | start_stmt_group (); | |
7232 | process_decls (Visible_Declarations (gnat_node), | |
7233 | Private_Declarations (gnat_node), Empty, true, true); | |
7234 | gnu_result = end_stmt_group (); | |
7235 | break; | |
7236 | ||
7237 | case N_Package_Body: | |
7238 | ||
1e17ef87 | 7239 | /* If this is the body of a generic package - do nothing. */ |
a1ab4c31 AC |
7240 | if (Ekind (Corresponding_Spec (gnat_node)) == E_Generic_Package) |
7241 | { | |
7242 | gnu_result = alloc_stmt_list (); | |
7243 | break; | |
7244 | } | |
7245 | ||
7246 | start_stmt_group (); | |
7247 | process_decls (Declarations (gnat_node), Empty, Empty, true, true); | |
7248 | ||
7249 | if (Present (Handled_Statement_Sequence (gnat_node))) | |
7250 | add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node))); | |
7251 | ||
7252 | gnu_result = end_stmt_group (); | |
7253 | break; | |
7254 | ||
1e17ef87 EB |
7255 | /********************************/ |
7256 | /* Chapter 8: Visibility Rules */ | |
7257 | /********************************/ | |
a1ab4c31 AC |
7258 | |
7259 | case N_Use_Package_Clause: | |
7260 | case N_Use_Type_Clause: | |
1e17ef87 | 7261 | /* Nothing to do here - but these may appear in list of declarations. */ |
a1ab4c31 AC |
7262 | gnu_result = alloc_stmt_list (); |
7263 | break; | |
7264 | ||
1e17ef87 EB |
7265 | /*********************/ |
7266 | /* Chapter 9: Tasks */ | |
7267 | /*********************/ | |
a1ab4c31 AC |
7268 | |
7269 | case N_Protected_Type_Declaration: | |
7270 | gnu_result = alloc_stmt_list (); | |
7271 | break; | |
7272 | ||
7273 | case N_Single_Task_Declaration: | |
afc737f0 | 7274 | gnat_to_gnu_entity (Defining_Entity (gnat_node), NULL_TREE, true); |
a1ab4c31 AC |
7275 | gnu_result = alloc_stmt_list (); |
7276 | break; | |
7277 | ||
1e17ef87 EB |
7278 | /*********************************************************/ |
7279 | /* Chapter 10: Program Structure and Compilation Issues */ | |
7280 | /*********************************************************/ | |
a1ab4c31 AC |
7281 | |
7282 | case N_Compilation_Unit: | |
a09d56d8 | 7283 | /* This is not called for the main unit on which gigi is invoked. */ |
a1ab4c31 AC |
7284 | Compilation_Unit_to_gnu (gnat_node); |
7285 | gnu_result = alloc_stmt_list (); | |
7286 | break; | |
7287 | ||
c4833de1 EB |
7288 | case N_Subunit: |
7289 | gnu_result = gnat_to_gnu (Proper_Body (gnat_node)); | |
7290 | break; | |
7291 | ||
7292 | case N_Entry_Body: | |
7293 | case N_Protected_Body: | |
7294 | case N_Task_Body: | |
7295 | /* These nodes should only be present when annotating types. */ | |
7296 | gcc_assert (type_annotate_only); | |
7297 | process_decls (Declarations (gnat_node), Empty, Empty, true, true); | |
7298 | gnu_result = alloc_stmt_list (); | |
7299 | break; | |
7300 | ||
a1ab4c31 AC |
7301 | case N_Subprogram_Body_Stub: |
7302 | case N_Package_Body_Stub: | |
7303 | case N_Protected_Body_Stub: | |
7304 | case N_Task_Body_Stub: | |
7305 | /* Simply process whatever unit is being inserted. */ | |
4e568a15 EB |
7306 | if (Present (Library_Unit (gnat_node))) |
7307 | gnu_result = gnat_to_gnu (Unit (Library_Unit (gnat_node))); | |
7308 | else | |
7309 | { | |
7310 | gcc_assert (type_annotate_only); | |
7311 | gnu_result = alloc_stmt_list (); | |
7312 | } | |
a1ab4c31 AC |
7313 | break; |
7314 | ||
a1ab4c31 | 7315 | /***************************/ |
1e17ef87 | 7316 | /* Chapter 11: Exceptions */ |
a1ab4c31 AC |
7317 | /***************************/ |
7318 | ||
7319 | case N_Handled_Sequence_Of_Statements: | |
7320 | /* If there is an At_End procedure attached to this node, and the EH | |
0ab0bf95 | 7321 | mechanism is front-end, we must have at least a corresponding At_End |
a1ab4c31 AC |
7322 | handler, unless the No_Exception_Handlers restriction is set. */ |
7323 | gcc_assert (type_annotate_only | |
0ab0bf95 | 7324 | || !Front_End_Exceptions () |
a1ab4c31 AC |
7325 | || No (At_End_Proc (gnat_node)) |
7326 | || Present (Exception_Handlers (gnat_node)) | |
7327 | || No_Exception_Handlers_Set ()); | |
7328 | ||
7329 | gnu_result = Handled_Sequence_Of_Statements_to_gnu (gnat_node); | |
7330 | break; | |
7331 | ||
7332 | case N_Exception_Handler: | |
0ab0bf95 OH |
7333 | if (Exception_Mechanism == Front_End_SJLJ) |
7334 | gnu_result = Exception_Handler_to_gnu_fe_sjlj (gnat_node); | |
7335 | else if (Back_End_Exceptions ()) | |
7336 | gnu_result = Exception_Handler_to_gnu_gcc (gnat_node); | |
a1ab4c31 AC |
7337 | else |
7338 | gcc_unreachable (); | |
624e1688 AC |
7339 | break; |
7340 | ||
7341 | case N_Raise_Statement: | |
7342 | /* Only for reraise in back-end exceptions mode. */ | |
7343 | gcc_assert (No (Name (gnat_node)) | |
0ab0bf95 | 7344 | && Back_End_Exceptions ()); |
624e1688 AC |
7345 | |
7346 | start_stmt_group (); | |
7347 | gnat_pushlevel (); | |
a1ab4c31 | 7348 | |
624e1688 AC |
7349 | /* Clear the current exception pointer so that the occurrence won't be |
7350 | deallocated. */ | |
7351 | gnu_expr = create_var_decl (get_identifier ("SAVED_EXPTR"), NULL_TREE, | |
7352 | ptr_type_node, gnu_incoming_exc_ptr, | |
2056c5ed EB |
7353 | false, false, false, false, false, |
7354 | true, true, NULL, gnat_node); | |
624e1688 AC |
7355 | |
7356 | add_stmt (build_binary_op (MODIFY_EXPR, NULL_TREE, gnu_incoming_exc_ptr, | |
9a1bdc31 | 7357 | build_int_cst (ptr_type_node, 0))); |
dddf8120 | 7358 | add_stmt (build_call_n_expr (reraise_zcx_decl, 1, gnu_expr)); |
624e1688 AC |
7359 | gnat_poplevel (); |
7360 | gnu_result = end_stmt_group (); | |
a1ab4c31 AC |
7361 | break; |
7362 | ||
7363 | case N_Push_Constraint_Error_Label: | |
7364 | push_exception_label_stack (&gnu_constraint_error_label_stack, | |
7365 | Exception_Label (gnat_node)); | |
7366 | break; | |
7367 | ||
7368 | case N_Push_Storage_Error_Label: | |
7369 | push_exception_label_stack (&gnu_storage_error_label_stack, | |
7370 | Exception_Label (gnat_node)); | |
7371 | break; | |
7372 | ||
7373 | case N_Push_Program_Error_Label: | |
7374 | push_exception_label_stack (&gnu_program_error_label_stack, | |
7375 | Exception_Label (gnat_node)); | |
7376 | break; | |
7377 | ||
7378 | case N_Pop_Constraint_Error_Label: | |
9771b263 | 7379 | gnu_constraint_error_label_stack->pop (); |
a1ab4c31 AC |
7380 | break; |
7381 | ||
7382 | case N_Pop_Storage_Error_Label: | |
9771b263 | 7383 | gnu_storage_error_label_stack->pop (); |
a1ab4c31 AC |
7384 | break; |
7385 | ||
7386 | case N_Pop_Program_Error_Label: | |
9771b263 | 7387 | gnu_program_error_label_stack->pop (); |
a1ab4c31 AC |
7388 | break; |
7389 | ||
1e17ef87 EB |
7390 | /******************************/ |
7391 | /* Chapter 12: Generic Units */ | |
7392 | /******************************/ | |
a1ab4c31 AC |
7393 | |
7394 | case N_Generic_Function_Renaming_Declaration: | |
7395 | case N_Generic_Package_Renaming_Declaration: | |
7396 | case N_Generic_Procedure_Renaming_Declaration: | |
7397 | case N_Generic_Package_Declaration: | |
7398 | case N_Generic_Subprogram_Declaration: | |
7399 | case N_Package_Instantiation: | |
7400 | case N_Procedure_Instantiation: | |
7401 | case N_Function_Instantiation: | |
7402 | /* These nodes can appear on a declaration list but there is nothing to | |
7403 | to be done with them. */ | |
7404 | gnu_result = alloc_stmt_list (); | |
7405 | break; | |
7406 | ||
1e17ef87 EB |
7407 | /**************************************************/ |
7408 | /* Chapter 13: Representation Clauses and */ | |
7409 | /* Implementation-Dependent Features */ | |
7410 | /**************************************************/ | |
a1ab4c31 AC |
7411 | |
7412 | case N_Attribute_Definition_Clause: | |
a1ab4c31 AC |
7413 | gnu_result = alloc_stmt_list (); |
7414 | ||
8df2e902 EB |
7415 | /* The only one we need to deal with is 'Address since, for the others, |
7416 | the front-end puts the information elsewhere. */ | |
7417 | if (Get_Attribute_Id (Chars (gnat_node)) != Attr_Address) | |
7418 | break; | |
7419 | ||
7420 | /* And we only deal with 'Address if the object has a Freeze node. */ | |
7421 | gnat_temp = Entity (Name (gnat_node)); | |
7422 | if (No (Freeze_Node (gnat_temp))) | |
a1ab4c31 AC |
7423 | break; |
7424 | ||
8df2e902 EB |
7425 | /* Get the value to use as the address and save it as the equivalent |
7426 | for the object. When it is frozen, gnat_to_gnu_entity will do the | |
7427 | right thing. */ | |
7428 | save_gnu_tree (gnat_temp, gnat_to_gnu (Expression (gnat_node)), true); | |
a1ab4c31 AC |
7429 | break; |
7430 | ||
7431 | case N_Enumeration_Representation_Clause: | |
7432 | case N_Record_Representation_Clause: | |
7433 | case N_At_Clause: | |
7434 | /* We do nothing with these. SEM puts the information elsewhere. */ | |
7435 | gnu_result = alloc_stmt_list (); | |
7436 | break; | |
7437 | ||
7438 | case N_Code_Statement: | |
7439 | if (!type_annotate_only) | |
7440 | { | |
7441 | tree gnu_template = gnat_to_gnu (Asm_Template (gnat_node)); | |
7442 | tree gnu_inputs = NULL_TREE, gnu_outputs = NULL_TREE; | |
7443 | tree gnu_clobbers = NULL_TREE, tail; | |
7444 | bool allows_mem, allows_reg, fake; | |
7445 | int ninputs, noutputs, i; | |
7446 | const char **oconstraints; | |
7447 | const char *constraint; | |
7448 | char *clobber; | |
7449 | ||
7450 | /* First retrieve the 3 operand lists built by the front-end. */ | |
7451 | Setup_Asm_Outputs (gnat_node); | |
7452 | while (Present (gnat_temp = Asm_Output_Variable ())) | |
7453 | { | |
7454 | tree gnu_value = gnat_to_gnu (gnat_temp); | |
7455 | tree gnu_constr = build_tree_list (NULL_TREE, gnat_to_gnu | |
7456 | (Asm_Output_Constraint ())); | |
7457 | ||
7458 | gnu_outputs = tree_cons (gnu_constr, gnu_value, gnu_outputs); | |
7459 | Next_Asm_Output (); | |
7460 | } | |
7461 | ||
7462 | Setup_Asm_Inputs (gnat_node); | |
7463 | while (Present (gnat_temp = Asm_Input_Value ())) | |
7464 | { | |
7465 | tree gnu_value = gnat_to_gnu (gnat_temp); | |
7466 | tree gnu_constr = build_tree_list (NULL_TREE, gnat_to_gnu | |
7467 | (Asm_Input_Constraint ())); | |
7468 | ||
7469 | gnu_inputs = tree_cons (gnu_constr, gnu_value, gnu_inputs); | |
7470 | Next_Asm_Input (); | |
7471 | } | |
7472 | ||
7473 | Clobber_Setup (gnat_node); | |
7474 | while ((clobber = Clobber_Get_Next ())) | |
7475 | gnu_clobbers | |
7476 | = tree_cons (NULL_TREE, | |
7477 | build_string (strlen (clobber) + 1, clobber), | |
7478 | gnu_clobbers); | |
7479 | ||
1e17ef87 | 7480 | /* Then perform some standard checking and processing on the |
a1ab4c31 AC |
7481 | operands. In particular, mark them addressable if needed. */ |
7482 | gnu_outputs = nreverse (gnu_outputs); | |
7483 | noutputs = list_length (gnu_outputs); | |
7484 | gnu_inputs = nreverse (gnu_inputs); | |
7485 | ninputs = list_length (gnu_inputs); | |
2bb1fc26 | 7486 | oconstraints = XALLOCAVEC (const char *, noutputs); |
a1ab4c31 AC |
7487 | |
7488 | for (i = 0, tail = gnu_outputs; tail; ++i, tail = TREE_CHAIN (tail)) | |
7489 | { | |
7490 | tree output = TREE_VALUE (tail); | |
7491 | constraint | |
7492 | = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail))); | |
7493 | oconstraints[i] = constraint; | |
7494 | ||
7495 | if (parse_output_constraint (&constraint, i, ninputs, noutputs, | |
7496 | &allows_mem, &allows_reg, &fake)) | |
7497 | { | |
7498 | /* If the operand is going to end up in memory, | |
7499 | mark it addressable. Note that we don't test | |
7500 | allows_mem like in the input case below; this | |
7501 | is modelled on the C front-end. */ | |
7e4680c1 EB |
7502 | if (!allows_reg) |
7503 | { | |
722356ce | 7504 | output = remove_conversions (output, false); |
7e4680c1 EB |
7505 | if (TREE_CODE (output) == CONST_DECL |
7506 | && DECL_CONST_CORRESPONDING_VAR (output)) | |
7507 | output = DECL_CONST_CORRESPONDING_VAR (output); | |
7508 | if (!gnat_mark_addressable (output)) | |
7509 | output = error_mark_node; | |
7510 | } | |
a1ab4c31 AC |
7511 | } |
7512 | else | |
7513 | output = error_mark_node; | |
7514 | ||
7515 | TREE_VALUE (tail) = output; | |
7516 | } | |
7517 | ||
7518 | for (i = 0, tail = gnu_inputs; tail; ++i, tail = TREE_CHAIN (tail)) | |
7519 | { | |
7520 | tree input = TREE_VALUE (tail); | |
7521 | constraint | |
7522 | = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail))); | |
7523 | ||
7524 | if (parse_input_constraint (&constraint, i, ninputs, noutputs, | |
7525 | 0, oconstraints, | |
7526 | &allows_mem, &allows_reg)) | |
7527 | { | |
7528 | /* If the operand is going to end up in memory, | |
7529 | mark it addressable. */ | |
7e4680c1 EB |
7530 | if (!allows_reg && allows_mem) |
7531 | { | |
722356ce | 7532 | input = remove_conversions (input, false); |
7e4680c1 EB |
7533 | if (TREE_CODE (input) == CONST_DECL |
7534 | && DECL_CONST_CORRESPONDING_VAR (input)) | |
7535 | input = DECL_CONST_CORRESPONDING_VAR (input); | |
7536 | if (!gnat_mark_addressable (input)) | |
7537 | input = error_mark_node; | |
7538 | } | |
a1ab4c31 AC |
7539 | } |
7540 | else | |
7541 | input = error_mark_node; | |
7542 | ||
7543 | TREE_VALUE (tail) = input; | |
7544 | } | |
7545 | ||
1c384bf1 | 7546 | gnu_result = build5 (ASM_EXPR, void_type_node, |
a1ab4c31 | 7547 | gnu_template, gnu_outputs, |
1c384bf1 | 7548 | gnu_inputs, gnu_clobbers, NULL_TREE); |
a1ab4c31 AC |
7549 | ASM_VOLATILE_P (gnu_result) = Is_Asm_Volatile (gnat_node); |
7550 | } | |
7551 | else | |
7552 | gnu_result = alloc_stmt_list (); | |
7553 | ||
7554 | break; | |
7555 | ||
1e17ef87 EB |
7556 | /****************/ |
7557 | /* Added Nodes */ | |
7558 | /****************/ | |
a1ab4c31 | 7559 | |
17c168fe | 7560 | case N_Expression_With_Actions: |
1a9ee222 OH |
7561 | /* This construct doesn't define a scope so we don't push a binding |
7562 | level around the statement list, but we wrap it in a SAVE_EXPR to | |
7563 | protect it from unsharing. Elaborate the expression as part of the | |
7564 | same statement group as the actions so that the type declaration | |
7565 | gets inserted there as well. This ensures that the type elaboration | |
7566 | code is issued past the actions computing values on which it might | |
7567 | depend. */ | |
1a9ee222 OH |
7568 | start_stmt_group (); |
7569 | add_stmt_list (Actions (gnat_node)); | |
7570 | gnu_expr = gnat_to_gnu (Expression (gnat_node)); | |
7571 | gnu_result = end_stmt_group (); | |
7572 | ||
17c168fe EB |
7573 | gnu_result = build1 (SAVE_EXPR, void_type_node, gnu_result); |
7574 | TREE_SIDE_EFFECTS (gnu_result) = 1; | |
1a9ee222 | 7575 | |
17c168fe | 7576 | gnu_result |
39ab2e8f | 7577 | = build_compound_expr (TREE_TYPE (gnu_expr), gnu_result, gnu_expr); |
e1860041 | 7578 | gnu_result_type = get_unpadded_type (Etype (gnat_node)); |
17c168fe EB |
7579 | break; |
7580 | ||
a1ab4c31 AC |
7581 | case N_Freeze_Entity: |
7582 | start_stmt_group (); | |
7583 | process_freeze_entity (gnat_node); | |
7584 | process_decls (Actions (gnat_node), Empty, Empty, true, true); | |
7585 | gnu_result = end_stmt_group (); | |
7586 | break; | |
7587 | ||
3cd4a210 AC |
7588 | case N_Freeze_Generic_Entity: |
7589 | gnu_result = alloc_stmt_list (); | |
7590 | break; | |
7591 | ||
a1ab4c31 AC |
7592 | case N_Itype_Reference: |
7593 | if (!present_gnu_tree (Itype (gnat_node))) | |
7594 | process_type (Itype (gnat_node)); | |
a1ab4c31 AC |
7595 | gnu_result = alloc_stmt_list (); |
7596 | break; | |
7597 | ||
7598 | case N_Free_Statement: | |
7599 | if (!type_annotate_only) | |
7600 | { | |
7601 | tree gnu_ptr = gnat_to_gnu (Expression (gnat_node)); | |
7602 | tree gnu_ptr_type = TREE_TYPE (gnu_ptr); | |
0d7de0e1 EB |
7603 | tree gnu_obj_type, gnu_actual_obj_type; |
7604 | ||
7605 | /* If this is a thin pointer, we must first dereference it to create | |
7606 | a fat pointer, then go back below to a thin pointer. The reason | |
7607 | for this is that we need to have a fat pointer someplace in order | |
7608 | to properly compute the size. */ | |
315cff15 | 7609 | if (TYPE_IS_THIN_POINTER_P (TREE_TYPE (gnu_ptr))) |
a1ab4c31 AC |
7610 | gnu_ptr = build_unary_op (ADDR_EXPR, NULL_TREE, |
7611 | build_unary_op (INDIRECT_REF, NULL_TREE, | |
7612 | gnu_ptr)); | |
7613 | ||
0d7de0e1 EB |
7614 | /* If this is a fat pointer, the object must have been allocated with |
7615 | the template in front of the array. So pass the template address, | |
7616 | and get the total size; do it by converting to a thin pointer. */ | |
315cff15 | 7617 | if (TYPE_IS_FAT_POINTER_P (TREE_TYPE (gnu_ptr))) |
a1ab4c31 AC |
7618 | gnu_ptr |
7619 | = convert (build_pointer_type | |
7620 | (TYPE_OBJECT_RECORD_TYPE | |
7621 | (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (gnu_ptr)))), | |
7622 | gnu_ptr); | |
7623 | ||
7624 | gnu_obj_type = TREE_TYPE (TREE_TYPE (gnu_ptr)); | |
7625 | ||
0d7de0e1 EB |
7626 | /* If this is a thin pointer, the object must have been allocated with |
7627 | the template in front of the array. So pass the template address, | |
7628 | and get the total size. */ | |
7629 | if (TYPE_IS_THIN_POINTER_P (TREE_TYPE (gnu_ptr))) | |
7630 | gnu_ptr | |
7631 | = build_binary_op (POINTER_PLUS_EXPR, TREE_TYPE (gnu_ptr), | |
7632 | gnu_ptr, | |
2b45154d EB |
7633 | fold_build1 (NEGATE_EXPR, sizetype, |
7634 | byte_position | |
7635 | (DECL_CHAIN | |
7636 | TYPE_FIELDS ((gnu_obj_type))))); | |
0d7de0e1 EB |
7637 | |
7638 | /* If we have a special dynamic constrained subtype on the node, use | |
7639 | it to compute the size; otherwise, use the designated subtype. */ | |
a1ab4c31 AC |
7640 | if (Present (Actual_Designated_Subtype (gnat_node))) |
7641 | { | |
7642 | gnu_actual_obj_type | |
1e17ef87 | 7643 | = gnat_to_gnu_type (Actual_Designated_Subtype (gnat_node)); |
a1ab4c31 | 7644 | |
315cff15 | 7645 | if (TYPE_IS_FAT_OR_THIN_POINTER_P (gnu_ptr_type)) |
1e17ef87 EB |
7646 | gnu_actual_obj_type |
7647 | = build_unc_object_type_from_ptr (gnu_ptr_type, | |
7648 | gnu_actual_obj_type, | |
928dfa4b EB |
7649 | get_identifier ("DEALLOC"), |
7650 | false); | |
a1ab4c31 AC |
7651 | } |
7652 | else | |
7653 | gnu_actual_obj_type = gnu_obj_type; | |
7654 | ||
62801a77 EB |
7655 | tree gnu_size = TYPE_SIZE_UNIT (gnu_actual_obj_type); |
7656 | gnu_size = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_size, gnu_ptr); | |
7657 | ||
ff346f70 | 7658 | gnu_result |
62801a77 | 7659 | = build_call_alloc_dealloc (gnu_ptr, gnu_size, gnu_obj_type, |
ff346f70 OH |
7660 | Procedure_To_Call (gnat_node), |
7661 | Storage_Pool (gnat_node), | |
7662 | gnat_node); | |
a1ab4c31 AC |
7663 | } |
7664 | break; | |
7665 | ||
7666 | case N_Raise_Constraint_Error: | |
7667 | case N_Raise_Program_Error: | |
7668 | case N_Raise_Storage_Error: | |
80096613 EB |
7669 | if (type_annotate_only) |
7670 | gnu_result = alloc_stmt_list (); | |
7671 | else | |
7672 | gnu_result = Raise_Error_to_gnu (gnat_node, &gnu_result_type); | |
a1ab4c31 AC |
7673 | break; |
7674 | ||
7675 | case N_Validate_Unchecked_Conversion: | |
f04b8d69 EB |
7676 | /* The only validation we currently do on an unchecked conversion is |
7677 | that of aliasing assumptions. */ | |
7678 | if (flag_strict_aliasing) | |
9771b263 | 7679 | gnat_validate_uc_list.safe_push (gnat_node); |
a1ab4c31 AC |
7680 | gnu_result = alloc_stmt_list (); |
7681 | break; | |
7682 | ||
4e568a15 EB |
7683 | case N_Function_Specification: |
7684 | case N_Procedure_Specification: | |
7685 | case N_Op_Concat: | |
7686 | case N_Component_Association: | |
4e568a15 EB |
7687 | /* These nodes should only be present when annotating types. */ |
7688 | gcc_assert (type_annotate_only); | |
a1ab4c31 | 7689 | gnu_result = alloc_stmt_list (); |
4e568a15 EB |
7690 | break; |
7691 | ||
7692 | default: | |
7693 | /* Other nodes are not supposed to reach here. */ | |
7694 | gcc_unreachable (); | |
a1ab4c31 AC |
7695 | } |
7696 | ||
a09d56d8 | 7697 | /* If we pushed the processing of the elaboration routine, pop it back. */ |
a1ab4c31 | 7698 | if (went_into_elab_proc) |
a09d56d8 | 7699 | current_function_decl = NULL_TREE; |
a1ab4c31 | 7700 | |
1fc24649 | 7701 | /* When not optimizing, turn boolean rvalues B into B != false tests |
f1ff07ec EB |
7702 | so that we can put the location information of the reference to B on |
7703 | the inequality operator for better debug info. */ | |
1fc24649 | 7704 | if (!optimize |
054d6b83 | 7705 | && TREE_CODE (gnu_result) != INTEGER_CST |
f1ff07ec | 7706 | && TREE_CODE (gnu_result) != TYPE_DECL |
1fc24649 EB |
7707 | && (kind == N_Identifier |
7708 | || kind == N_Expanded_Name | |
7709 | || kind == N_Explicit_Dereference | |
7710 | || kind == N_Function_Call | |
7711 | || kind == N_Indexed_Component | |
7712 | || kind == N_Selected_Component) | |
7713 | && TREE_CODE (get_base_type (gnu_result_type)) == BOOLEAN_TYPE | |
7714 | && !lvalue_required_p (gnat_node, gnu_result_type, false, false, false)) | |
f1ff07ec EB |
7715 | { |
7716 | gnu_result | |
7717 | = build_binary_op (NE_EXPR, gnu_result_type, | |
7718 | convert (gnu_result_type, gnu_result), | |
7719 | convert (gnu_result_type, boolean_false_node)); | |
7720 | if (TREE_CODE (gnu_result) != INTEGER_CST) | |
7721 | set_gnu_expr_location_from_node (gnu_result, gnat_node); | |
7722 | } | |
7723 | ||
7724 | /* Set the location information on the result if it's not a simple name. | |
7725 | Note that we may have no result if we tried to build a CALL_EXPR node | |
7726 | to a procedure with no side-effects and optimization is enabled. */ | |
7727 | else if (kind != N_Identifier && gnu_result && EXPR_P (gnu_result)) | |
17c168fe | 7728 | set_gnu_expr_location_from_node (gnu_result, gnat_node); |
a1ab4c31 AC |
7729 | |
7730 | /* If we're supposed to return something of void_type, it means we have | |
7731 | something we're elaborating for effect, so just return. */ | |
7732 | if (TREE_CODE (gnu_result_type) == VOID_TYPE) | |
7733 | return gnu_result; | |
7734 | ||
c1abd261 EB |
7735 | /* If the result is a constant that overflowed, raise Constraint_Error. */ |
7736 | if (TREE_CODE (gnu_result) == INTEGER_CST && TREE_OVERFLOW (gnu_result)) | |
a1ab4c31 | 7737 | { |
c01fe451 | 7738 | post_error ("?`Constraint_Error` will be raised at run time", gnat_node); |
a1ab4c31 AC |
7739 | gnu_result |
7740 | = build1 (NULL_EXPR, gnu_result_type, | |
7741 | build_call_raise (CE_Overflow_Check_Failed, gnat_node, | |
7742 | N_Raise_Constraint_Error)); | |
7743 | } | |
7744 | ||
62801a77 EB |
7745 | /* If the result has side-effects and is of an unconstrained type, protect |
7746 | the expression in case it will be referenced multiple times, i.e. for | |
7747 | its value and to compute the size of an object. But do it neither for | |
7748 | an object nor a renaming declaration, nor a return statement of a call | |
7749 | to a function that returns an unconstrained record type with default | |
7750 | discriminant, because there is no size to be computed in these cases | |
7751 | and this will create a useless temporary. We must do this before any | |
7752 | conversions. */ | |
a1ab4c31 AC |
7753 | if (TREE_SIDE_EFFECTS (gnu_result) |
7754 | && (TREE_CODE (gnu_result_type) == UNCONSTRAINED_ARRAY_TYPE | |
62801a77 EB |
7755 | || CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type))) |
7756 | && !(TREE_CODE (gnu_result) == CALL_EXPR | |
7757 | && type_is_padding_self_referential (TREE_TYPE (gnu_result)) | |
7758 | && (Nkind (Parent (gnat_node)) == N_Object_Declaration | |
7759 | || Nkind (Parent (gnat_node)) == N_Object_Renaming_Declaration | |
7760 | || Nkind (Parent (gnat_node)) == N_Simple_Return_Statement))) | |
7194767c | 7761 | gnu_result = gnat_protect_expr (gnu_result); |
a1ab4c31 AC |
7762 | |
7763 | /* Now convert the result to the result type, unless we are in one of the | |
7764 | following cases: | |
7765 | ||
27ab5bd8 EB |
7766 | 1. If this is the LHS of an assignment or an actual parameter of a |
7767 | call, return the result almost unmodified since the RHS will have | |
7768 | to be converted to our type in that case, unless the result type | |
7769 | has a simpler size. Likewise if there is just a no-op unchecked | |
7770 | conversion in-between. Similarly, don't convert integral types | |
7771 | that are the operands of an unchecked conversion since we need | |
7772 | to ignore those conversions (for 'Valid). | |
a1ab4c31 AC |
7773 | |
7774 | 2. If we have a label (which doesn't have any well-defined type), a | |
abbc8c7b EB |
7775 | field or an error, return the result almost unmodified. Similarly, |
7776 | if the two types are record types with the same name, don't convert. | |
7777 | This will be the case when we are converting from a packable version | |
7778 | of a type to its original type and we need those conversions to be | |
7779 | NOPs in order for assignments into these types to work properly. | |
a1ab4c31 AC |
7780 | |
7781 | 3. If the type is void or if we have no result, return error_mark_node | |
7782 | to show we have no result. | |
7783 | ||
fc7a823e EB |
7784 | 4. If this is a call to a function that returns with variable size and |
7785 | the call is used as the expression in either an object or a renaming | |
7786 | declaration, return the result unmodified because we want to use the | |
7787 | return slot optimization in this case. | |
16934bbf EB |
7788 | |
7789 | 5. Finally, if the type of the result is already correct. */ | |
a1ab4c31 AC |
7790 | |
7791 | if (Present (Parent (gnat_node)) | |
27ab5bd8 | 7792 | && (lhs_or_actual_p (gnat_node) |
c2efda0d | 7793 | || (Nkind (Parent (gnat_node)) == N_Unchecked_Type_Conversion |
4f8a6678 | 7794 | && unchecked_conversion_nop (Parent (gnat_node))) |
a1ab4c31 AC |
7795 | || (Nkind (Parent (gnat_node)) == N_Unchecked_Type_Conversion |
7796 | && !AGGREGATE_TYPE_P (gnu_result_type) | |
7797 | && !AGGREGATE_TYPE_P (TREE_TYPE (gnu_result)))) | |
7798 | && !(TYPE_SIZE (gnu_result_type) | |
7799 | && TYPE_SIZE (TREE_TYPE (gnu_result)) | |
7800 | && (AGGREGATE_TYPE_P (gnu_result_type) | |
7801 | == AGGREGATE_TYPE_P (TREE_TYPE (gnu_result))) | |
7802 | && ((TREE_CODE (TYPE_SIZE (gnu_result_type)) == INTEGER_CST | |
7803 | && (TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_result))) | |
7804 | != INTEGER_CST)) | |
7805 | || (TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST | |
7806 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type)) | |
7807 | && (CONTAINS_PLACEHOLDER_P | |
7808 | (TYPE_SIZE (TREE_TYPE (gnu_result)))))) | |
7809 | && !(TREE_CODE (gnu_result_type) == RECORD_TYPE | |
7810 | && TYPE_JUSTIFIED_MODULAR_P (gnu_result_type)))) | |
7811 | { | |
7812 | /* Remove padding only if the inner object is of self-referential | |
7813 | size: in that case it must be an object of unconstrained type | |
7814 | with a default discriminant and we want to avoid copying too | |
7815 | much data. */ | |
fc7a823e | 7816 | if (type_is_padding_self_referential (TREE_TYPE (gnu_result))) |
a1ab4c31 AC |
7817 | gnu_result = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_result))), |
7818 | gnu_result); | |
7819 | } | |
7820 | ||
7821 | else if (TREE_CODE (gnu_result) == LABEL_DECL | |
7822 | || TREE_CODE (gnu_result) == FIELD_DECL | |
7823 | || TREE_CODE (gnu_result) == ERROR_MARK | |
abbc8c7b EB |
7824 | || (TYPE_NAME (gnu_result_type) |
7825 | == TYPE_NAME (TREE_TYPE (gnu_result)) | |
a1ab4c31 AC |
7826 | && TREE_CODE (gnu_result_type) == RECORD_TYPE |
7827 | && TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE)) | |
7828 | { | |
7829 | /* Remove any padding. */ | |
315cff15 | 7830 | if (TYPE_IS_PADDING_P (TREE_TYPE (gnu_result))) |
a1ab4c31 AC |
7831 | gnu_result = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_result))), |
7832 | gnu_result); | |
7833 | } | |
7834 | ||
7835 | else if (gnu_result == error_mark_node || gnu_result_type == void_type_node) | |
7836 | gnu_result = error_mark_node; | |
7837 | ||
fc7a823e EB |
7838 | else if (Present (Parent (gnat_node)) |
7839 | && (Nkind (Parent (gnat_node)) == N_Object_Declaration | |
7840 | || Nkind (Parent (gnat_node)) == N_Object_Renaming_Declaration) | |
7841 | && TREE_CODE (gnu_result) == CALL_EXPR | |
7842 | && return_type_with_variable_size_p (TREE_TYPE (gnu_result))) | |
842d4ee2 | 7843 | ; |
16934bbf EB |
7844 | |
7845 | else if (TREE_TYPE (gnu_result) != gnu_result_type) | |
a1ab4c31 AC |
7846 | gnu_result = convert (gnu_result_type, gnu_result); |
7847 | ||
7848 | /* We don't need any NOP_EXPR or NON_LVALUE_EXPR on the result. */ | |
7849 | while ((TREE_CODE (gnu_result) == NOP_EXPR | |
7850 | || TREE_CODE (gnu_result) == NON_LVALUE_EXPR) | |
7851 | && TREE_TYPE (TREE_OPERAND (gnu_result, 0)) == TREE_TYPE (gnu_result)) | |
7852 | gnu_result = TREE_OPERAND (gnu_result, 0); | |
7853 | ||
7854 | return gnu_result; | |
7855 | } | |
93e708f9 EB |
7856 | |
7857 | /* Similar to gnat_to_gnu, but discard any object that might be created in | |
7858 | the course of the translation of GNAT_NODE, which must be an "external" | |
7859 | expression in the sense that it will be elaborated elsewhere. */ | |
7860 | ||
7861 | tree | |
7862 | gnat_to_gnu_external (Node_Id gnat_node) | |
7863 | { | |
7864 | const int save_force_global = force_global; | |
7865 | bool went_into_elab_proc = false; | |
7866 | ||
7867 | /* Force the local context and create a fake scope that we zap | |
7868 | at the end so declarations will not be stuck either in the | |
7869 | global varpool or in the current scope. */ | |
7870 | if (!current_function_decl) | |
7871 | { | |
7872 | current_function_decl = get_elaboration_procedure (); | |
7873 | went_into_elab_proc = true; | |
7874 | } | |
7875 | force_global = 0; | |
7876 | gnat_pushlevel (); | |
7877 | ||
7878 | tree gnu_result = gnat_to_gnu (gnat_node); | |
7879 | ||
7880 | gnat_zaplevel (); | |
7881 | force_global = save_force_global; | |
7882 | if (went_into_elab_proc) | |
7883 | current_function_decl = NULL_TREE; | |
7884 | ||
f1ff07ec EB |
7885 | /* Do not import locations from external units. */ |
7886 | if (gnu_result && EXPR_P (gnu_result)) | |
7887 | SET_EXPR_LOCATION (gnu_result, UNKNOWN_LOCATION); | |
7888 | ||
93e708f9 EB |
7889 | return gnu_result; |
7890 | } | |
a1ab4c31 AC |
7891 | \f |
7892 | /* Subroutine of above to push the exception label stack. GNU_STACK is | |
7893 | a pointer to the stack to update and GNAT_LABEL, if present, is the | |
7894 | label to push onto the stack. */ | |
7895 | ||
7896 | static void | |
9771b263 | 7897 | push_exception_label_stack (vec<tree, va_gc> **gnu_stack, Entity_Id gnat_label) |
a1ab4c31 AC |
7898 | { |
7899 | tree gnu_label = (Present (gnat_label) | |
afc737f0 | 7900 | ? gnat_to_gnu_entity (gnat_label, NULL_TREE, false) |
a1ab4c31 AC |
7901 | : NULL_TREE); |
7902 | ||
9771b263 | 7903 | vec_safe_push (*gnu_stack, gnu_label); |
a1ab4c31 AC |
7904 | } |
7905 | \f | |
102a1631 EB |
7906 | /* Return true if the statement list STMT_LIST is empty. */ |
7907 | ||
7908 | static bool | |
7909 | empty_stmt_list_p (tree stmt_list) | |
7910 | { | |
7911 | tree_stmt_iterator tsi; | |
7912 | ||
7913 | for (tsi = tsi_start (stmt_list); !tsi_end_p (tsi); tsi_next (&tsi)) | |
7914 | { | |
7915 | tree stmt = tsi_stmt (tsi); | |
7916 | ||
7917 | /* Anything else than an empty STMT_STMT counts as something. */ | |
7918 | if (TREE_CODE (stmt) != STMT_STMT || STMT_STMT_STMT (stmt)) | |
7919 | return false; | |
7920 | } | |
7921 | ||
7922 | return true; | |
7923 | } | |
7924 | ||
a1ab4c31 AC |
7925 | /* Record the current code position in GNAT_NODE. */ |
7926 | ||
7927 | static void | |
7928 | record_code_position (Node_Id gnat_node) | |
7929 | { | |
7930 | tree stmt_stmt = build1 (STMT_STMT, void_type_node, NULL_TREE); | |
7931 | ||
7932 | add_stmt_with_node (stmt_stmt, gnat_node); | |
7933 | save_gnu_tree (gnat_node, stmt_stmt, true); | |
7934 | } | |
7935 | ||
7936 | /* Insert the code for GNAT_NODE at the position saved for that node. */ | |
7937 | ||
7938 | static void | |
7939 | insert_code_for (Node_Id gnat_node) | |
7940 | { | |
102a1631 EB |
7941 | tree code = gnat_to_gnu (gnat_node); |
7942 | ||
7943 | /* It's too late to remove the STMT_STMT itself at this point. */ | |
7944 | if (!empty_stmt_list_p (code)) | |
7945 | STMT_STMT_STMT (get_gnu_tree (gnat_node)) = code; | |
7946 | ||
a1ab4c31 AC |
7947 | save_gnu_tree (gnat_node, NULL_TREE, true); |
7948 | } | |
7949 | \f | |
7950 | /* Start a new statement group chained to the previous group. */ | |
7951 | ||
7952 | void | |
7953 | start_stmt_group (void) | |
7954 | { | |
7955 | struct stmt_group *group = stmt_group_free_list; | |
7956 | ||
7957 | /* First see if we can get one from the free list. */ | |
7958 | if (group) | |
7959 | stmt_group_free_list = group->previous; | |
7960 | else | |
766090c2 | 7961 | group = ggc_alloc<stmt_group> (); |
a1ab4c31 AC |
7962 | |
7963 | group->previous = current_stmt_group; | |
7964 | group->stmt_list = group->block = group->cleanups = NULL_TREE; | |
7965 | current_stmt_group = group; | |
7966 | } | |
7967 | ||
586fea26 EB |
7968 | /* Add GNU_STMT to the current statement group. If it is an expression with |
7969 | no effects, it is ignored. */ | |
a1ab4c31 AC |
7970 | |
7971 | void | |
7972 | add_stmt (tree gnu_stmt) | |
7973 | { | |
7974 | append_to_statement_list (gnu_stmt, ¤t_stmt_group->stmt_list); | |
7975 | } | |
7976 | ||
586fea26 EB |
7977 | /* Similar, but the statement is always added, regardless of side-effects. */ |
7978 | ||
7979 | void | |
7980 | add_stmt_force (tree gnu_stmt) | |
7981 | { | |
7982 | append_to_statement_list_force (gnu_stmt, ¤t_stmt_group->stmt_list); | |
7983 | } | |
7984 | ||
7985 | /* Like add_stmt, but set the location of GNU_STMT to that of GNAT_NODE. */ | |
a1ab4c31 AC |
7986 | |
7987 | void | |
7988 | add_stmt_with_node (tree gnu_stmt, Node_Id gnat_node) | |
7989 | { | |
ac43e11e AC |
7990 | /* Do not emit a location for renamings that come from generic instantiation, |
7991 | they are likely to disturb debugging. */ | |
7992 | if (Present (gnat_node) | |
7993 | && !renaming_from_generic_instantiation_p (gnat_node)) | |
a1ab4c31 AC |
7994 | set_expr_location_from_node (gnu_stmt, gnat_node); |
7995 | add_stmt (gnu_stmt); | |
7996 | } | |
7997 | ||
586fea26 EB |
7998 | /* Similar, but the statement is always added, regardless of side-effects. */ |
7999 | ||
8000 | void | |
8001 | add_stmt_with_node_force (tree gnu_stmt, Node_Id gnat_node) | |
8002 | { | |
8003 | if (Present (gnat_node)) | |
8004 | set_expr_location_from_node (gnu_stmt, gnat_node); | |
8005 | add_stmt_force (gnu_stmt); | |
8006 | } | |
8007 | ||
a1ab4c31 AC |
8008 | /* Add a declaration statement for GNU_DECL to the current statement group. |
8009 | Get SLOC from Entity_Id. */ | |
8010 | ||
8011 | void | |
8012 | add_decl_expr (tree gnu_decl, Entity_Id gnat_entity) | |
8013 | { | |
8014 | tree type = TREE_TYPE (gnu_decl); | |
8015 | tree gnu_stmt, gnu_init, t; | |
8016 | ||
8017 | /* If this is a variable that Gigi is to ignore, we may have been given | |
8018 | an ERROR_MARK. So test for it. We also might have been given a | |
8019 | reference for a renaming. So only do something for a decl. Also | |
8020 | ignore a TYPE_DECL for an UNCONSTRAINED_ARRAY_TYPE. */ | |
8021 | if (!DECL_P (gnu_decl) | |
8022 | || (TREE_CODE (gnu_decl) == TYPE_DECL | |
8023 | && TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE)) | |
8024 | return; | |
8025 | ||
8026 | gnu_stmt = build1 (DECL_EXPR, void_type_node, gnu_decl); | |
8027 | ||
6ba4f08f EB |
8028 | /* If we are external or global, we don't want to output the DECL_EXPR for |
8029 | this DECL node since we already have evaluated the expressions in the | |
a1ab4c31 | 8030 | sizes and positions as globals and doing it again would be wrong. */ |
6ba4f08f | 8031 | if (DECL_EXTERNAL (gnu_decl) || global_bindings_p ()) |
a1ab4c31 AC |
8032 | { |
8033 | /* Mark everything as used to prevent node sharing with subprograms. | |
8034 | Note that walk_tree knows how to deal with TYPE_DECL, but neither | |
8035 | VAR_DECL nor CONST_DECL. This appears to be somewhat arbitrary. */ | |
3f13dd77 | 8036 | MARK_VISITED (gnu_stmt); |
a1ab4c31 AC |
8037 | if (TREE_CODE (gnu_decl) == VAR_DECL |
8038 | || TREE_CODE (gnu_decl) == CONST_DECL) | |
8039 | { | |
3f13dd77 EB |
8040 | MARK_VISITED (DECL_SIZE (gnu_decl)); |
8041 | MARK_VISITED (DECL_SIZE_UNIT (gnu_decl)); | |
8042 | MARK_VISITED (DECL_INITIAL (gnu_decl)); | |
a1ab4c31 | 8043 | } |
321e10dd EB |
8044 | /* In any case, we have to deal with our own TYPE_ADA_SIZE field. */ |
8045 | else if (TREE_CODE (gnu_decl) == TYPE_DECL | |
e1e5852c EB |
8046 | && RECORD_OR_UNION_TYPE_P (type) |
8047 | && !TYPE_FAT_POINTER_P (type)) | |
321e10dd | 8048 | MARK_VISITED (TYPE_ADA_SIZE (type)); |
a1ab4c31 | 8049 | } |
6ba4f08f | 8050 | else |
a1ab4c31 AC |
8051 | add_stmt_with_node (gnu_stmt, gnat_entity); |
8052 | ||
8053 | /* If this is a variable and an initializer is attached to it, it must be | |
ba464315 | 8054 | valid for the context. Similar to init_const in create_var_decl. */ |
a1ab4c31 | 8055 | if (TREE_CODE (gnu_decl) == VAR_DECL |
7c775aca | 8056 | && (gnu_init = DECL_INITIAL (gnu_decl)) |
a1ab4c31 AC |
8057 | && (!gnat_types_compatible_p (type, TREE_TYPE (gnu_init)) |
8058 | || (TREE_STATIC (gnu_decl) | |
8059 | && !initializer_constant_valid_p (gnu_init, | |
8060 | TREE_TYPE (gnu_init))))) | |
8061 | { | |
8062 | /* If GNU_DECL has a padded type, convert it to the unpadded | |
8063 | type so the assignment is done properly. */ | |
315cff15 | 8064 | if (TYPE_IS_PADDING_P (type)) |
a1ab4c31 AC |
8065 | t = convert (TREE_TYPE (TYPE_FIELDS (type)), gnu_decl); |
8066 | else | |
8067 | t = gnu_decl; | |
8068 | ||
d47d0a8d | 8069 | gnu_stmt = build_binary_op (INIT_EXPR, NULL_TREE, t, gnu_init); |
a1ab4c31 AC |
8070 | |
8071 | DECL_INITIAL (gnu_decl) = NULL_TREE; | |
8072 | if (TREE_READONLY (gnu_decl)) | |
8073 | { | |
8074 | TREE_READONLY (gnu_decl) = 0; | |
8075 | DECL_READONLY_ONCE_ELAB (gnu_decl) = 1; | |
8076 | } | |
8077 | ||
8078 | add_stmt_with_node (gnu_stmt, gnat_entity); | |
8079 | } | |
8080 | } | |
8081 | ||
8082 | /* Callback for walk_tree to mark the visited trees rooted at *TP. */ | |
8083 | ||
8084 | static tree | |
8085 | mark_visited_r (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED) | |
8086 | { | |
3f13dd77 EB |
8087 | tree t = *tp; |
8088 | ||
8089 | if (TREE_VISITED (t)) | |
a1ab4c31 AC |
8090 | *walk_subtrees = 0; |
8091 | ||
8092 | /* Don't mark a dummy type as visited because we want to mark its sizes | |
8093 | and fields once it's filled in. */ | |
3f13dd77 EB |
8094 | else if (!TYPE_IS_DUMMY_P (t)) |
8095 | TREE_VISITED (t) = 1; | |
a1ab4c31 | 8096 | |
3f13dd77 EB |
8097 | if (TYPE_P (t)) |
8098 | TYPE_SIZES_GIMPLIFIED (t) = 1; | |
a1ab4c31 AC |
8099 | |
8100 | return NULL_TREE; | |
8101 | } | |
8102 | ||
3f13dd77 EB |
8103 | /* Mark nodes rooted at T with TREE_VISITED and types as having their |
8104 | sized gimplified. We use this to indicate all variable sizes and | |
8105 | positions in global types may not be shared by any subprogram. */ | |
8106 | ||
8107 | void | |
8108 | mark_visited (tree t) | |
8109 | { | |
8110 | walk_tree (&t, mark_visited_r, NULL, NULL); | |
8111 | } | |
8112 | ||
a1ab4c31 | 8113 | /* Add GNU_CLEANUP, a cleanup action, to the current code group and |
362db0b2 TQ |
8114 | set its location to that of GNAT_NODE if present, but with column info |
8115 | cleared so that conditional branches generated as part of the cleanup | |
8116 | code do not interfere with coverage analysis tools. */ | |
a1ab4c31 AC |
8117 | |
8118 | static void | |
8119 | add_cleanup (tree gnu_cleanup, Node_Id gnat_node) | |
8120 | { | |
8121 | if (Present (gnat_node)) | |
ba464315 | 8122 | set_expr_location_from_node (gnu_cleanup, gnat_node, true); |
a1ab4c31 AC |
8123 | append_to_statement_list (gnu_cleanup, ¤t_stmt_group->cleanups); |
8124 | } | |
8125 | ||
8126 | /* Set the BLOCK node corresponding to the current code group to GNU_BLOCK. */ | |
8127 | ||
8128 | void | |
8129 | set_block_for_group (tree gnu_block) | |
8130 | { | |
8131 | gcc_assert (!current_stmt_group->block); | |
8132 | current_stmt_group->block = gnu_block; | |
8133 | } | |
8134 | ||
8135 | /* Return code corresponding to the current code group. It is normally | |
8136 | a STATEMENT_LIST, but may also be a BIND_EXPR or TRY_FINALLY_EXPR if | |
8137 | BLOCK or cleanups were set. */ | |
8138 | ||
8139 | tree | |
8140 | end_stmt_group (void) | |
8141 | { | |
8142 | struct stmt_group *group = current_stmt_group; | |
8143 | tree gnu_retval = group->stmt_list; | |
8144 | ||
8145 | /* If this is a null list, allocate a new STATEMENT_LIST. Then, if there | |
8146 | are cleanups, make a TRY_FINALLY_EXPR. Last, if there is a BLOCK, | |
8147 | make a BIND_EXPR. Note that we nest in that because the cleanup may | |
8148 | reference variables in the block. */ | |
7c775aca | 8149 | if (!gnu_retval) |
a1ab4c31 AC |
8150 | gnu_retval = alloc_stmt_list (); |
8151 | ||
8152 | if (group->cleanups) | |
8153 | gnu_retval = build2 (TRY_FINALLY_EXPR, void_type_node, gnu_retval, | |
8154 | group->cleanups); | |
8155 | ||
8156 | if (current_stmt_group->block) | |
8157 | gnu_retval = build3 (BIND_EXPR, void_type_node, BLOCK_VARS (group->block), | |
8158 | gnu_retval, group->block); | |
8159 | ||
8160 | /* Remove this group from the stack and add it to the free list. */ | |
8161 | current_stmt_group = group->previous; | |
8162 | group->previous = stmt_group_free_list; | |
8163 | stmt_group_free_list = group; | |
8164 | ||
8165 | return gnu_retval; | |
8166 | } | |
8167 | ||
a712b009 EB |
8168 | /* Return whether the current statement group may fall through. */ |
8169 | ||
8170 | static inline bool | |
8171 | stmt_group_may_fallthru (void) | |
8172 | { | |
8173 | if (current_stmt_group->stmt_list) | |
8174 | return block_may_fallthru (current_stmt_group->stmt_list); | |
8175 | else | |
8176 | return true; | |
8177 | } | |
8178 | ||
a1ab4c31 AC |
8179 | /* Add a list of statements from GNAT_LIST, a possibly-empty list of |
8180 | statements.*/ | |
8181 | ||
8182 | static void | |
8183 | add_stmt_list (List_Id gnat_list) | |
8184 | { | |
8185 | Node_Id gnat_node; | |
8186 | ||
8187 | if (Present (gnat_list)) | |
8188 | for (gnat_node = First (gnat_list); Present (gnat_node); | |
8189 | gnat_node = Next (gnat_node)) | |
8190 | add_stmt (gnat_to_gnu (gnat_node)); | |
8191 | } | |
8192 | ||
8193 | /* Build a tree from GNAT_LIST, a possibly-empty list of statements. | |
8194 | If BINDING_P is true, push and pop a binding level around the list. */ | |
8195 | ||
8196 | static tree | |
8197 | build_stmt_group (List_Id gnat_list, bool binding_p) | |
8198 | { | |
8199 | start_stmt_group (); | |
547bbe49 | 8200 | |
a1ab4c31 AC |
8201 | if (binding_p) |
8202 | gnat_pushlevel (); | |
8203 | ||
8204 | add_stmt_list (gnat_list); | |
547bbe49 | 8205 | |
a1ab4c31 AC |
8206 | if (binding_p) |
8207 | gnat_poplevel (); | |
8208 | ||
8209 | return end_stmt_group (); | |
8210 | } | |
8211 | \f | |
a1ab4c31 AC |
8212 | /* Generate GIMPLE in place for the expression at *EXPR_P. */ |
8213 | ||
8214 | int | |
8215 | gnat_gimplify_expr (tree *expr_p, gimple_seq *pre_p, | |
8216 | gimple_seq *post_p ATTRIBUTE_UNUSED) | |
8217 | { | |
8218 | tree expr = *expr_p; | |
5e0f1fca | 8219 | tree type = TREE_TYPE (expr); |
a1ab4c31 AC |
8220 | tree op; |
8221 | ||
8222 | if (IS_ADA_STMT (expr)) | |
8223 | return gnat_gimplify_stmt (expr_p); | |
8224 | ||
8225 | switch (TREE_CODE (expr)) | |
8226 | { | |
8227 | case NULL_EXPR: | |
5e0f1fca EB |
8228 | /* If this is an aggregate type, build a null pointer of the appropriate |
8229 | type and dereference it. */ | |
8230 | if (AGGREGATE_TYPE_P (type) | |
8231 | || TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE) | |
8232 | *expr_p = build_unary_op (INDIRECT_REF, NULL_TREE, | |
8233 | convert (build_pointer_type (type), | |
8234 | integer_zero_node)); | |
8235 | /* Otherwise, just make a VAR_DECL. */ | |
a1ab4c31 AC |
8236 | else |
8237 | { | |
5e0f1fca | 8238 | *expr_p = create_tmp_var (type, NULL); |
a1ab4c31 AC |
8239 | TREE_NO_WARNING (*expr_p) = 1; |
8240 | } | |
8241 | ||
8242 | gimplify_and_add (TREE_OPERAND (expr, 0), pre_p); | |
8243 | return GS_OK; | |
8244 | ||
8245 | case UNCONSTRAINED_ARRAY_REF: | |
8246 | /* We should only do this if we are just elaborating for side-effects, | |
8247 | but we can't know that yet. */ | |
8248 | *expr_p = TREE_OPERAND (*expr_p, 0); | |
8249 | return GS_OK; | |
8250 | ||
8251 | case ADDR_EXPR: | |
8252 | op = TREE_OPERAND (expr, 0); | |
8253 | ||
bb021771 EB |
8254 | /* If we are taking the address of a constant CONSTRUCTOR, make sure it |
8255 | is put into static memory. We know that it's going to be read-only | |
8256 | given the semantics we have and it must be in static memory when the | |
8257 | reference is in an elaboration procedure. */ | |
8258 | if (TREE_CODE (op) == CONSTRUCTOR && TREE_CONSTANT (op)) | |
a1ab4c31 | 8259 | { |
bb021771 | 8260 | tree addr = build_fold_addr_expr (tree_output_constant_def (op)); |
5e0f1fca | 8261 | *expr_p = fold_convert (type, addr); |
bb021771 EB |
8262 | return GS_ALL_DONE; |
8263 | } | |
cb3d597d | 8264 | |
241125b2 EB |
8265 | /* Replace atomic loads with their first argument. That's necessary |
8266 | because the gimplifier would create a temporary otherwise. */ | |
8267 | if (TREE_SIDE_EFFECTS (op)) | |
8268 | while (handled_component_p (op) || CONVERT_EXPR_P (op)) | |
8269 | { | |
8270 | tree inner = TREE_OPERAND (op, 0); | |
8271 | if (TREE_CODE (inner) == CALL_EXPR && call_is_atomic_load (inner)) | |
8272 | { | |
8273 | tree t = CALL_EXPR_ARG (inner, 0); | |
8274 | if (TREE_CODE (t) == NOP_EXPR) | |
8275 | t = TREE_OPERAND (t, 0); | |
8276 | if (TREE_CODE (t) == ADDR_EXPR) | |
8277 | TREE_OPERAND (op, 0) = TREE_OPERAND (t, 0); | |
8278 | else | |
8279 | TREE_OPERAND (op, 0) = build_fold_indirect_ref (t); | |
8280 | } | |
8281 | else | |
8282 | op = inner; | |
8283 | } | |
8284 | ||
456976d8 EB |
8285 | return GS_UNHANDLED; |
8286 | ||
819a653e EB |
8287 | case VIEW_CONVERT_EXPR: |
8288 | op = TREE_OPERAND (expr, 0); | |
8289 | ||
8290 | /* If we are view-converting a CONSTRUCTOR or a call from an aggregate | |
8291 | type to a scalar one, explicitly create the local temporary. That's | |
8292 | required if the type is passed by reference. */ | |
8293 | if ((TREE_CODE (op) == CONSTRUCTOR || TREE_CODE (op) == CALL_EXPR) | |
8294 | && AGGREGATE_TYPE_P (TREE_TYPE (op)) | |
5e0f1fca | 8295 | && !AGGREGATE_TYPE_P (type)) |
819a653e EB |
8296 | { |
8297 | tree mod, new_var = create_tmp_var_raw (TREE_TYPE (op), "C"); | |
8298 | gimple_add_tmp_var (new_var); | |
8299 | ||
8300 | mod = build2 (INIT_EXPR, TREE_TYPE (new_var), new_var, op); | |
8301 | gimplify_and_add (mod, pre_p); | |
8302 | ||
8303 | TREE_OPERAND (expr, 0) = new_var; | |
8304 | return GS_OK; | |
8305 | } | |
8306 | ||
8307 | return GS_UNHANDLED; | |
8308 | ||
456976d8 EB |
8309 | case DECL_EXPR: |
8310 | op = DECL_EXPR_DECL (expr); | |
8311 | ||
8312 | /* The expressions for the RM bounds must be gimplified to ensure that | |
8313 | they are properly elaborated. See gimplify_decl_expr. */ | |
8314 | if ((TREE_CODE (op) == TYPE_DECL || TREE_CODE (op) == VAR_DECL) | |
8315 | && !TYPE_SIZES_GIMPLIFIED (TREE_TYPE (op))) | |
8316 | switch (TREE_CODE (TREE_TYPE (op))) | |
42c08997 | 8317 | { |
456976d8 EB |
8318 | case INTEGER_TYPE: |
8319 | case ENUMERAL_TYPE: | |
8320 | case BOOLEAN_TYPE: | |
8321 | case REAL_TYPE: | |
8322 | { | |
8323 | tree type = TYPE_MAIN_VARIANT (TREE_TYPE (op)), t, val; | |
8324 | ||
8325 | val = TYPE_RM_MIN_VALUE (type); | |
8326 | if (val) | |
8327 | { | |
8328 | gimplify_one_sizepos (&val, pre_p); | |
8329 | for (t = type; t; t = TYPE_NEXT_VARIANT (t)) | |
8330 | SET_TYPE_RM_MIN_VALUE (t, val); | |
8331 | } | |
8332 | ||
8333 | val = TYPE_RM_MAX_VALUE (type); | |
8334 | if (val) | |
8335 | { | |
8336 | gimplify_one_sizepos (&val, pre_p); | |
8337 | for (t = type; t; t = TYPE_NEXT_VARIANT (t)) | |
8338 | SET_TYPE_RM_MAX_VALUE (t, val); | |
8339 | } | |
8340 | ||
8341 | } | |
8342 | break; | |
8343 | ||
8344 | default: | |
8345 | break; | |
42c08997 | 8346 | } |
456976d8 | 8347 | |
a1ab4c31 AC |
8348 | /* ... fall through ... */ |
8349 | ||
8350 | default: | |
8351 | return GS_UNHANDLED; | |
8352 | } | |
8353 | } | |
8354 | ||
8355 | /* Generate GIMPLE in place for the statement at *STMT_P. */ | |
8356 | ||
8357 | static enum gimplify_status | |
8358 | gnat_gimplify_stmt (tree *stmt_p) | |
8359 | { | |
8360 | tree stmt = *stmt_p; | |
8361 | ||
8362 | switch (TREE_CODE (stmt)) | |
8363 | { | |
8364 | case STMT_STMT: | |
8365 | *stmt_p = STMT_STMT_STMT (stmt); | |
8366 | return GS_OK; | |
8367 | ||
8368 | case LOOP_STMT: | |
8369 | { | |
c172df28 | 8370 | tree gnu_start_label = create_artificial_label (input_location); |
d88bbbb9 EB |
8371 | tree gnu_cond = LOOP_STMT_COND (stmt); |
8372 | tree gnu_update = LOOP_STMT_UPDATE (stmt); | |
a1ab4c31 | 8373 | tree gnu_end_label = LOOP_STMT_LABEL (stmt); |
a1ab4c31 | 8374 | |
d88bbbb9 EB |
8375 | /* Build the condition expression from the test, if any. */ |
8376 | if (gnu_cond) | |
3418f5e9 EB |
8377 | { |
8378 | /* Deal with the optimization hints. */ | |
8379 | if (LOOP_STMT_IVDEP (stmt)) | |
8380 | gnu_cond = build2 (ANNOTATE_EXPR, TREE_TYPE (gnu_cond), gnu_cond, | |
8381 | build_int_cst (integer_type_node, | |
8382 | annot_expr_ivdep_kind)); | |
718c4601 EB |
8383 | if (LOOP_STMT_NO_VECTOR (stmt)) |
8384 | gnu_cond = build2 (ANNOTATE_EXPR, TREE_TYPE (gnu_cond), gnu_cond, | |
8385 | build_int_cst (integer_type_node, | |
8386 | annot_expr_no_vector_kind)); | |
8387 | if (LOOP_STMT_VECTOR (stmt)) | |
8388 | gnu_cond = build2 (ANNOTATE_EXPR, TREE_TYPE (gnu_cond), gnu_cond, | |
8389 | build_int_cst (integer_type_node, | |
8390 | annot_expr_vector_kind)); | |
8391 | ||
3418f5e9 EB |
8392 | gnu_cond |
8393 | = build3 (COND_EXPR, void_type_node, gnu_cond, NULL_TREE, | |
8394 | build1 (GOTO_EXPR, void_type_node, gnu_end_label)); | |
8395 | } | |
d88bbbb9 | 8396 | |
a1ab4c31 AC |
8397 | /* Set to emit the statements of the loop. */ |
8398 | *stmt_p = NULL_TREE; | |
8399 | ||
d88bbbb9 EB |
8400 | /* We first emit the start label and then a conditional jump to the |
8401 | end label if there's a top condition, then the update if it's at | |
8402 | the top, then the body of the loop, then a conditional jump to | |
8403 | the end label if there's a bottom condition, then the update if | |
8404 | it's at the bottom, and finally a jump to the start label and the | |
8405 | definition of the end label. */ | |
a1ab4c31 AC |
8406 | append_to_statement_list (build1 (LABEL_EXPR, void_type_node, |
8407 | gnu_start_label), | |
8408 | stmt_p); | |
8409 | ||
d88bbbb9 EB |
8410 | if (gnu_cond && !LOOP_STMT_BOTTOM_COND_P (stmt)) |
8411 | append_to_statement_list (gnu_cond, stmt_p); | |
8412 | ||
8413 | if (gnu_update && LOOP_STMT_TOP_UPDATE_P (stmt)) | |
8414 | append_to_statement_list (gnu_update, stmt_p); | |
a1ab4c31 AC |
8415 | |
8416 | append_to_statement_list (LOOP_STMT_BODY (stmt), stmt_p); | |
8417 | ||
d88bbbb9 EB |
8418 | if (gnu_cond && LOOP_STMT_BOTTOM_COND_P (stmt)) |
8419 | append_to_statement_list (gnu_cond, stmt_p); | |
8420 | ||
8421 | if (gnu_update && !LOOP_STMT_TOP_UPDATE_P (stmt)) | |
8422 | append_to_statement_list (gnu_update, stmt_p); | |
a1ab4c31 | 8423 | |
3418f5e9 | 8424 | tree t = build1 (GOTO_EXPR, void_type_node, gnu_start_label); |
a1ab4c31 AC |
8425 | SET_EXPR_LOCATION (t, DECL_SOURCE_LOCATION (gnu_end_label)); |
8426 | append_to_statement_list (t, stmt_p); | |
8427 | ||
8428 | append_to_statement_list (build1 (LABEL_EXPR, void_type_node, | |
8429 | gnu_end_label), | |
8430 | stmt_p); | |
8431 | return GS_OK; | |
8432 | } | |
8433 | ||
8434 | case EXIT_STMT: | |
8435 | /* Build a statement to jump to the corresponding end label, then | |
8436 | see if it needs to be conditional. */ | |
8437 | *stmt_p = build1 (GOTO_EXPR, void_type_node, EXIT_STMT_LABEL (stmt)); | |
8438 | if (EXIT_STMT_COND (stmt)) | |
8439 | *stmt_p = build3 (COND_EXPR, void_type_node, | |
8440 | EXIT_STMT_COND (stmt), *stmt_p, alloc_stmt_list ()); | |
8441 | return GS_OK; | |
8442 | ||
8443 | default: | |
8444 | gcc_unreachable (); | |
8445 | } | |
8446 | } | |
8447 | \f | |
2b2a2e9e EB |
8448 | /* Force a reference to each of the entities in GNAT_PACKAGE recursively. |
8449 | ||
8450 | This routine is exclusively called in type_annotate mode, to compute DDA | |
8451 | information for types in withed units, for ASIS use. */ | |
8452 | ||
8453 | static void | |
8454 | elaborate_all_entities_for_package (Entity_Id gnat_package) | |
8455 | { | |
8456 | Entity_Id gnat_entity; | |
8457 | ||
8458 | for (gnat_entity = First_Entity (gnat_package); | |
8459 | Present (gnat_entity); | |
8460 | gnat_entity = Next_Entity (gnat_entity)) | |
8461 | { | |
8462 | const Entity_Kind kind = Ekind (gnat_entity); | |
8463 | ||
8464 | /* We are interested only in entities visible from the main unit. */ | |
8465 | if (!Is_Public (gnat_entity)) | |
8466 | continue; | |
8467 | ||
8468 | /* Skip stuff internal to the compiler. */ | |
8469 | if (Convention (gnat_entity) == Convention_Intrinsic) | |
8470 | continue; | |
8471 | if (kind == E_Operator) | |
8472 | continue; | |
8473 | if (IN (kind, Subprogram_Kind) && Is_Intrinsic_Subprogram (gnat_entity)) | |
8474 | continue; | |
f8a9b81f EB |
8475 | if (Is_Itype (gnat_entity)) |
8476 | continue; | |
2b2a2e9e EB |
8477 | |
8478 | /* Skip named numbers. */ | |
8479 | if (IN (kind, Named_Kind)) | |
8480 | continue; | |
8481 | ||
8482 | /* Skip generic declarations. */ | |
8483 | if (IN (kind, Generic_Unit_Kind)) | |
8484 | continue; | |
8485 | ||
cce309d7 EB |
8486 | /* Skip formal objects. */ |
8487 | if (IN (kind, Formal_Object_Kind)) | |
8488 | continue; | |
8489 | ||
2b2a2e9e EB |
8490 | /* Skip package bodies. */ |
8491 | if (kind == E_Package_Body) | |
8492 | continue; | |
8493 | ||
8494 | /* Skip limited views that point back to the main unit. */ | |
8495 | if (IN (kind, Incomplete_Kind) | |
8496 | && From_Limited_With (gnat_entity) | |
8497 | && In_Extended_Main_Code_Unit (Non_Limited_View (gnat_entity))) | |
8498 | continue; | |
8499 | ||
8500 | /* Skip types that aren't frozen. */ | |
8501 | if (IN (kind, Type_Kind) && !Is_Frozen (gnat_entity)) | |
8502 | continue; | |
8503 | ||
8504 | /* Recurse on real packages that aren't in the main unit. */ | |
8505 | if (kind == E_Package) | |
8506 | { | |
8507 | if (No (Renamed_Entity (gnat_entity)) | |
8508 | && !In_Extended_Main_Code_Unit (gnat_entity)) | |
8509 | elaborate_all_entities_for_package (gnat_entity); | |
8510 | } | |
8511 | else | |
afc737f0 | 8512 | gnat_to_gnu_entity (gnat_entity, NULL_TREE, false); |
2b2a2e9e EB |
8513 | } |
8514 | } | |
8515 | ||
8516 | /* Force a reference to each of the entities in packages withed by GNAT_NODE. | |
a1ab4c31 AC |
8517 | Operate recursively but check that we aren't elaborating something more |
8518 | than once. | |
8519 | ||
8520 | This routine is exclusively called in type_annotate mode, to compute DDA | |
8521 | information for types in withed units, for ASIS use. */ | |
8522 | ||
8523 | static void | |
8524 | elaborate_all_entities (Node_Id gnat_node) | |
8525 | { | |
2b2a2e9e | 8526 | Entity_Id gnat_with_clause; |
a1ab4c31 AC |
8527 | |
8528 | /* Process each unit only once. As we trace the context of all relevant | |
8529 | units transitively, including generic bodies, we may encounter the | |
8530 | same generic unit repeatedly. */ | |
8531 | if (!present_gnu_tree (gnat_node)) | |
8532 | save_gnu_tree (gnat_node, integer_zero_node, true); | |
8533 | ||
8534 | /* Save entities in all context units. A body may have an implicit_with | |
8535 | on its own spec, if the context includes a child unit, so don't save | |
8536 | the spec twice. */ | |
8537 | for (gnat_with_clause = First (Context_Items (gnat_node)); | |
8538 | Present (gnat_with_clause); | |
8539 | gnat_with_clause = Next (gnat_with_clause)) | |
8540 | if (Nkind (gnat_with_clause) == N_With_Clause | |
8541 | && !present_gnu_tree (Library_Unit (gnat_with_clause)) | |
8542 | && Library_Unit (gnat_with_clause) != Library_Unit (Cunit (Main_Unit))) | |
8543 | { | |
2b2a2e9e EB |
8544 | Node_Id gnat_unit = Library_Unit (gnat_with_clause); |
8545 | Entity_Id gnat_entity = Entity (Name (gnat_with_clause)); | |
a1ab4c31 | 8546 | |
2b2a2e9e EB |
8547 | elaborate_all_entities (gnat_unit); |
8548 | ||
8549 | if (Ekind (gnat_entity) == E_Package) | |
8550 | elaborate_all_entities_for_package (gnat_entity); | |
8551 | ||
8552 | else if (Ekind (gnat_entity) == E_Generic_Package) | |
a1ab4c31 | 8553 | { |
2b2a2e9e | 8554 | Node_Id gnat_body = Corresponding_Body (Unit (gnat_unit)); |
a1ab4c31 AC |
8555 | |
8556 | /* Retrieve compilation unit node of generic body. */ | |
8557 | while (Present (gnat_body) | |
8558 | && Nkind (gnat_body) != N_Compilation_Unit) | |
8559 | gnat_body = Parent (gnat_body); | |
8560 | ||
8561 | /* If body is available, elaborate its context. */ | |
8562 | if (Present (gnat_body)) | |
8563 | elaborate_all_entities (gnat_body); | |
8564 | } | |
8565 | } | |
8566 | ||
8567 | if (Nkind (Unit (gnat_node)) == N_Package_Body) | |
8568 | elaborate_all_entities (Library_Unit (gnat_node)); | |
8569 | } | |
8570 | \f | |
f08863f9 | 8571 | /* Do the processing of GNAT_NODE, an N_Freeze_Entity. */ |
a1ab4c31 AC |
8572 | |
8573 | static void | |
8574 | process_freeze_entity (Node_Id gnat_node) | |
8575 | { | |
f08863f9 EB |
8576 | const Entity_Id gnat_entity = Entity (gnat_node); |
8577 | const Entity_Kind kind = Ekind (gnat_entity); | |
8578 | tree gnu_old, gnu_new; | |
8579 | ||
8580 | /* If this is a package, we need to generate code for the package. */ | |
8581 | if (kind == E_Package) | |
a1ab4c31 AC |
8582 | { |
8583 | insert_code_for | |
f08863f9 EB |
8584 | (Parent (Corresponding_Body |
8585 | (Parent (Declaration_Node (gnat_entity))))); | |
a1ab4c31 AC |
8586 | return; |
8587 | } | |
8588 | ||
f08863f9 EB |
8589 | /* Don't do anything for class-wide types as they are always transformed |
8590 | into their root type. */ | |
8591 | if (kind == E_Class_Wide_Type) | |
8592 | return; | |
8593 | ||
1e55d29a EB |
8594 | /* Check for an old definition if this isn't an object with address clause, |
8595 | since the saved GCC tree is the address expression in that case. */ | |
a1ab4c31 | 8596 | gnu_old |
1e55d29a EB |
8597 | = present_gnu_tree (gnat_entity) && No (Address_Clause (gnat_entity)) |
8598 | ? get_gnu_tree (gnat_entity) : NULL_TREE; | |
a1ab4c31 AC |
8599 | |
8600 | /* Don't do anything for subprograms that may have been elaborated before | |
f08863f9 EB |
8601 | their freeze nodes. This can happen, for example, because of an inner |
8602 | call in an instance body or because of previous compilation of a spec | |
8603 | for inlining purposes. */ | |
a1ab4c31 AC |
8604 | if (gnu_old |
8605 | && ((TREE_CODE (gnu_old) == FUNCTION_DECL | |
f08863f9 EB |
8606 | && (kind == E_Function || kind == E_Procedure)) |
8607 | || (TREE_CODE (TREE_TYPE (gnu_old)) == FUNCTION_TYPE | |
8608 | && kind == E_Subprogram_Type))) | |
a1ab4c31 AC |
8609 | return; |
8610 | ||
d5ebeb8c EB |
8611 | /* If we have a non-dummy type old tree, we have nothing to do, except for |
8612 | aborting, since this node was never delayed as it should have been. We | |
a1ab4c31 | 8613 | let this happen for concurrent types and their Corresponding_Record_Type, |
f08863f9 | 8614 | however, because each might legitimately be elaborated before its own |
a1ab4c31 AC |
8615 | freeze node, e.g. while processing the other. */ |
8616 | if (gnu_old | |
8617 | && !(TREE_CODE (gnu_old) == TYPE_DECL | |
8618 | && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old)))) | |
8619 | { | |
d5ebeb8c | 8620 | gcc_assert (Is_Concurrent_Type (gnat_entity) |
f08863f9 | 8621 | || (IN (kind, Record_Kind) |
a1ab4c31 AC |
8622 | && Is_Concurrent_Record_Type (gnat_entity))); |
8623 | return; | |
8624 | } | |
8625 | ||
8626 | /* Reset the saved tree, if any, and elaborate the object or type for real. | |
f08863f9 EB |
8627 | If there is a full view, elaborate it and use the result. And, if this |
8628 | is the root type of a class-wide type, reuse it for the latter. */ | |
a1ab4c31 AC |
8629 | if (gnu_old) |
8630 | { | |
8631 | save_gnu_tree (gnat_entity, NULL_TREE, false); | |
bf0b0e5e | 8632 | |
f08863f9 | 8633 | if (IN (kind, Incomplete_Or_Private_Kind) |
bf0b0e5e AC |
8634 | && Present (Full_View (gnat_entity))) |
8635 | { | |
8636 | Entity_Id full_view = Full_View (gnat_entity); | |
8637 | ||
f10ff6cc AC |
8638 | save_gnu_tree (full_view, NULL_TREE, false); |
8639 | ||
bf0b0e5e AC |
8640 | if (IN (Ekind (full_view), Private_Kind) |
8641 | && Present (Underlying_Full_View (full_view))) | |
f10ff6cc AC |
8642 | { |
8643 | full_view = Underlying_Full_View (full_view); | |
8644 | save_gnu_tree (full_view, NULL_TREE, false); | |
8645 | } | |
bf0b0e5e AC |
8646 | } |
8647 | ||
f08863f9 EB |
8648 | if (IN (kind, Type_Kind) |
8649 | && Present (Class_Wide_Type (gnat_entity)) | |
8650 | && Root_Type (Class_Wide_Type (gnat_entity)) == gnat_entity) | |
a1ab4c31 AC |
8651 | save_gnu_tree (Class_Wide_Type (gnat_entity), NULL_TREE, false); |
8652 | } | |
8653 | ||
f08863f9 | 8654 | if (IN (kind, Incomplete_Or_Private_Kind) |
a1ab4c31 AC |
8655 | && Present (Full_View (gnat_entity))) |
8656 | { | |
bf0b0e5e AC |
8657 | Entity_Id full_view = Full_View (gnat_entity); |
8658 | ||
8659 | if (IN (Ekind (full_view), Private_Kind) | |
8660 | && Present (Underlying_Full_View (full_view))) | |
8661 | full_view = Underlying_Full_View (full_view); | |
8662 | ||
afc737f0 | 8663 | gnu_new = gnat_to_gnu_entity (full_view, NULL_TREE, true); |
a1ab4c31 AC |
8664 | |
8665 | /* Propagate back-annotations from full view to partial view. */ | |
8666 | if (Unknown_Alignment (gnat_entity)) | |
bf0b0e5e | 8667 | Set_Alignment (gnat_entity, Alignment (full_view)); |
a1ab4c31 AC |
8668 | |
8669 | if (Unknown_Esize (gnat_entity)) | |
bf0b0e5e | 8670 | Set_Esize (gnat_entity, Esize (full_view)); |
a1ab4c31 AC |
8671 | |
8672 | if (Unknown_RM_Size (gnat_entity)) | |
bf0b0e5e | 8673 | Set_RM_Size (gnat_entity, RM_Size (full_view)); |
a1ab4c31 AC |
8674 | |
8675 | /* The above call may have defined this entity (the simplest example | |
f08863f9 EB |
8676 | of this is when we have a private enumeral type since the bounds |
8677 | will have the public view). */ | |
a1ab4c31 | 8678 | if (!present_gnu_tree (gnat_entity)) |
f08863f9 | 8679 | save_gnu_tree (gnat_entity, gnu_new, false); |
a1ab4c31 AC |
8680 | } |
8681 | else | |
f08863f9 EB |
8682 | { |
8683 | tree gnu_init | |
8684 | = (Nkind (Declaration_Node (gnat_entity)) == N_Object_Declaration | |
8685 | && present_gnu_tree (Declaration_Node (gnat_entity))) | |
8686 | ? get_gnu_tree (Declaration_Node (gnat_entity)) : NULL_TREE; | |
8687 | ||
afc737f0 | 8688 | gnu_new = gnat_to_gnu_entity (gnat_entity, gnu_init, true); |
f08863f9 EB |
8689 | } |
8690 | ||
8691 | if (IN (kind, Type_Kind) | |
8692 | && Present (Class_Wide_Type (gnat_entity)) | |
8693 | && Root_Type (Class_Wide_Type (gnat_entity)) == gnat_entity) | |
8694 | save_gnu_tree (Class_Wide_Type (gnat_entity), gnu_new, false); | |
a1ab4c31 | 8695 | |
65444786 EB |
8696 | /* If we have an old type and we've made pointers to this type, update those |
8697 | pointers. If this is a Taft amendment type in the main unit, we need to | |
8698 | mark the type as used since other units referencing it don't see the full | |
8699 | declaration and, therefore, cannot mark it as used themselves. */ | |
a1ab4c31 | 8700 | if (gnu_old) |
65444786 EB |
8701 | { |
8702 | update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old)), | |
8703 | TREE_TYPE (gnu_new)); | |
1e55d29a EB |
8704 | if (TYPE_DUMMY_IN_PROFILE_P (TREE_TYPE (gnu_old))) |
8705 | update_profiles_with (TREE_TYPE (gnu_old)); | |
65444786 EB |
8706 | if (DECL_TAFT_TYPE_P (gnu_old)) |
8707 | used_types_insert (TREE_TYPE (gnu_new)); | |
8708 | } | |
a1ab4c31 AC |
8709 | } |
8710 | \f | |
a1ab4c31 AC |
8711 | /* Elaborate decls in the lists GNAT_DECLS and GNAT_DECLS2, if present. |
8712 | We make two passes, one to elaborate anything other than bodies (but | |
8713 | we declare a function if there was no spec). The second pass | |
8714 | elaborates the bodies. | |
8715 | ||
8716 | GNAT_END_LIST gives the element in the list past the end. Normally, | |
8717 | this is Empty, but can be First_Real_Statement for a | |
8718 | Handled_Sequence_Of_Statements. | |
8719 | ||
8720 | We make a complete pass through both lists if PASS1P is true, then make | |
8721 | the second pass over both lists if PASS2P is true. The lists usually | |
8722 | correspond to the public and private parts of a package. */ | |
8723 | ||
8724 | static void | |
8725 | process_decls (List_Id gnat_decls, List_Id gnat_decls2, | |
1e17ef87 | 8726 | Node_Id gnat_end_list, bool pass1p, bool pass2p) |
a1ab4c31 AC |
8727 | { |
8728 | List_Id gnat_decl_array[2]; | |
8729 | Node_Id gnat_decl; | |
8730 | int i; | |
8731 | ||
8732 | gnat_decl_array[0] = gnat_decls, gnat_decl_array[1] = gnat_decls2; | |
8733 | ||
8734 | if (pass1p) | |
8735 | for (i = 0; i <= 1; i++) | |
8736 | if (Present (gnat_decl_array[i])) | |
8737 | for (gnat_decl = First (gnat_decl_array[i]); | |
8738 | gnat_decl != gnat_end_list; gnat_decl = Next (gnat_decl)) | |
8739 | { | |
8740 | /* For package specs, we recurse inside the declarations, | |
8741 | thus taking the two pass approach inside the boundary. */ | |
8742 | if (Nkind (gnat_decl) == N_Package_Declaration | |
8743 | && (Nkind (Specification (gnat_decl) | |
8744 | == N_Package_Specification))) | |
8745 | process_decls (Visible_Declarations (Specification (gnat_decl)), | |
8746 | Private_Declarations (Specification (gnat_decl)), | |
8747 | Empty, true, false); | |
8748 | ||
8749 | /* Similarly for any declarations in the actions of a | |
8750 | freeze node. */ | |
8751 | else if (Nkind (gnat_decl) == N_Freeze_Entity) | |
8752 | { | |
8753 | process_freeze_entity (gnat_decl); | |
8754 | process_decls (Actions (gnat_decl), Empty, Empty, true, false); | |
8755 | } | |
8756 | ||
8757 | /* Package bodies with freeze nodes get their elaboration deferred | |
8758 | until the freeze node, but the code must be placed in the right | |
8759 | place, so record the code position now. */ | |
8760 | else if (Nkind (gnat_decl) == N_Package_Body | |
8761 | && Present (Freeze_Node (Corresponding_Spec (gnat_decl)))) | |
8762 | record_code_position (gnat_decl); | |
8763 | ||
1e17ef87 | 8764 | else if (Nkind (gnat_decl) == N_Package_Body_Stub |
a1ab4c31 AC |
8765 | && Present (Library_Unit (gnat_decl)) |
8766 | && Present (Freeze_Node | |
8767 | (Corresponding_Spec | |
8768 | (Proper_Body (Unit | |
8769 | (Library_Unit (gnat_decl))))))) | |
8770 | record_code_position | |
8771 | (Proper_Body (Unit (Library_Unit (gnat_decl)))); | |
8772 | ||
8773 | /* We defer most subprogram bodies to the second pass. */ | |
8774 | else if (Nkind (gnat_decl) == N_Subprogram_Body) | |
8775 | { | |
8776 | if (Acts_As_Spec (gnat_decl)) | |
8777 | { | |
8778 | Node_Id gnat_subprog_id = Defining_Entity (gnat_decl); | |
8779 | ||
8780 | if (Ekind (gnat_subprog_id) != E_Generic_Procedure | |
8781 | && Ekind (gnat_subprog_id) != E_Generic_Function) | |
afc737f0 | 8782 | gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE, true); |
a1ab4c31 AC |
8783 | } |
8784 | } | |
1e17ef87 EB |
8785 | |
8786 | /* For bodies and stubs that act as their own specs, the entity | |
8787 | itself must be elaborated in the first pass, because it may | |
8788 | be used in other declarations. */ | |
a1ab4c31 AC |
8789 | else if (Nkind (gnat_decl) == N_Subprogram_Body_Stub) |
8790 | { | |
1e17ef87 EB |
8791 | Node_Id gnat_subprog_id |
8792 | = Defining_Entity (Specification (gnat_decl)); | |
a1ab4c31 AC |
8793 | |
8794 | if (Ekind (gnat_subprog_id) != E_Subprogram_Body | |
1e17ef87 | 8795 | && Ekind (gnat_subprog_id) != E_Generic_Procedure |
a1ab4c31 | 8796 | && Ekind (gnat_subprog_id) != E_Generic_Function) |
afc737f0 | 8797 | gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE, true); |
1e17ef87 | 8798 | } |
a1ab4c31 AC |
8799 | |
8800 | /* Concurrent stubs stand for the corresponding subprogram bodies, | |
8801 | which are deferred like other bodies. */ | |
8802 | else if (Nkind (gnat_decl) == N_Task_Body_Stub | |
8803 | || Nkind (gnat_decl) == N_Protected_Body_Stub) | |
8804 | ; | |
1e17ef87 | 8805 | |
1d4b96e0 AC |
8806 | /* Renamed subprograms may not be elaborated yet at this point |
8807 | since renamings do not trigger freezing. Wait for the second | |
8808 | pass to take care of them. */ | |
8809 | else if (Nkind (gnat_decl) == N_Subprogram_Renaming_Declaration) | |
8810 | ; | |
8811 | ||
a1ab4c31 AC |
8812 | else |
8813 | add_stmt (gnat_to_gnu (gnat_decl)); | |
8814 | } | |
8815 | ||
8816 | /* Here we elaborate everything we deferred above except for package bodies, | |
8817 | which are elaborated at their freeze nodes. Note that we must also | |
8818 | go inside things (package specs and freeze nodes) the first pass did. */ | |
8819 | if (pass2p) | |
8820 | for (i = 0; i <= 1; i++) | |
8821 | if (Present (gnat_decl_array[i])) | |
8822 | for (gnat_decl = First (gnat_decl_array[i]); | |
8823 | gnat_decl != gnat_end_list; gnat_decl = Next (gnat_decl)) | |
8824 | { | |
8825 | if (Nkind (gnat_decl) == N_Subprogram_Body | |
8826 | || Nkind (gnat_decl) == N_Subprogram_Body_Stub | |
8827 | || Nkind (gnat_decl) == N_Task_Body_Stub | |
8828 | || Nkind (gnat_decl) == N_Protected_Body_Stub) | |
8829 | add_stmt (gnat_to_gnu (gnat_decl)); | |
8830 | ||
8831 | else if (Nkind (gnat_decl) == N_Package_Declaration | |
8832 | && (Nkind (Specification (gnat_decl) | |
8833 | == N_Package_Specification))) | |
8834 | process_decls (Visible_Declarations (Specification (gnat_decl)), | |
8835 | Private_Declarations (Specification (gnat_decl)), | |
8836 | Empty, false, true); | |
8837 | ||
8838 | else if (Nkind (gnat_decl) == N_Freeze_Entity) | |
8839 | process_decls (Actions (gnat_decl), Empty, Empty, false, true); | |
1d4b96e0 AC |
8840 | |
8841 | else if (Nkind (gnat_decl) == N_Subprogram_Renaming_Declaration) | |
8842 | add_stmt (gnat_to_gnu (gnat_decl)); | |
a1ab4c31 AC |
8843 | } |
8844 | } | |
8845 | \f | |
b666e568 | 8846 | /* Make a unary operation of kind CODE using build_unary_op, but guard |
a7c43bbc EB |
8847 | the operation by an overflow check. CODE can be one of NEGATE_EXPR |
8848 | or ABS_EXPR. GNU_TYPE is the type desired for the result. Usually | |
10069d53 EB |
8849 | the operation is to be performed in that type. GNAT_NODE is the gnat |
8850 | node conveying the source location for which the error should be | |
8851 | signaled. */ | |
b666e568 GB |
8852 | |
8853 | static tree | |
10069d53 EB |
8854 | build_unary_op_trapv (enum tree_code code, tree gnu_type, tree operand, |
8855 | Node_Id gnat_node) | |
b666e568 | 8856 | { |
a7c43bbc | 8857 | gcc_assert (code == NEGATE_EXPR || code == ABS_EXPR); |
b666e568 | 8858 | |
7d7a1fe8 | 8859 | operand = gnat_protect_expr (operand); |
b666e568 | 8860 | |
1139f2e8 | 8861 | return emit_check (build_binary_op (EQ_EXPR, boolean_type_node, |
b666e568 GB |
8862 | operand, TYPE_MIN_VALUE (gnu_type)), |
8863 | build_unary_op (code, gnu_type, operand), | |
10069d53 | 8864 | CE_Overflow_Check_Failed, gnat_node); |
b666e568 GB |
8865 | } |
8866 | ||
a7c43bbc EB |
8867 | /* Make a binary operation of kind CODE using build_binary_op, but guard |
8868 | the operation by an overflow check. CODE can be one of PLUS_EXPR, | |
8869 | MINUS_EXPR or MULT_EXPR. GNU_TYPE is the type desired for the result. | |
10069d53 EB |
8870 | Usually the operation is to be performed in that type. GNAT_NODE is |
8871 | the GNAT node conveying the source location for which the error should | |
8872 | be signaled. */ | |
b666e568 GB |
8873 | |
8874 | static tree | |
a7c43bbc | 8875 | build_binary_op_trapv (enum tree_code code, tree gnu_type, tree left, |
10069d53 | 8876 | tree right, Node_Id gnat_node) |
b666e568 | 8877 | { |
3f1be5be | 8878 | const unsigned int precision = TYPE_PRECISION (gnu_type); |
7d7a1fe8 EB |
8879 | tree lhs = gnat_protect_expr (left); |
8880 | tree rhs = gnat_protect_expr (right); | |
b666e568 GB |
8881 | tree type_max = TYPE_MAX_VALUE (gnu_type); |
8882 | tree type_min = TYPE_MIN_VALUE (gnu_type); | |
aa18f65a EB |
8883 | tree gnu_expr, check; |
8884 | int sgn; | |
b666e568 | 8885 | |
3f1be5be AC |
8886 | /* Assert that the precision is a power of 2. */ |
8887 | gcc_assert ((precision & (precision - 1)) == 0); | |
b666e568 | 8888 | |
aa18f65a EB |
8889 | /* Prefer a constant on the RHS to simplify checks. */ |
8890 | if (TREE_CODE (rhs) != INTEGER_CST | |
8891 | && TREE_CODE (lhs) == INTEGER_CST | |
8892 | && (code == PLUS_EXPR || code == MULT_EXPR)) | |
b666e568 | 8893 | { |
a7c43bbc EB |
8894 | tree tmp = lhs; |
8895 | lhs = rhs; | |
8896 | rhs = tmp; | |
4ae39383 GB |
8897 | } |
8898 | ||
3f1be5be AC |
8899 | gnu_expr = build_binary_op (code, gnu_type, lhs, rhs); |
8900 | ||
8901 | /* If we can fold the expression to a constant, just return it. | |
8902 | The caller will deal with overflow, no need to generate a check. */ | |
aa18f65a | 8903 | if (TREE_CODE (gnu_expr) == INTEGER_CST) |
3f1be5be AC |
8904 | return gnu_expr; |
8905 | ||
aa18f65a EB |
8906 | /* If no operand is a constant, we use the generic implementation. */ |
8907 | if (TREE_CODE (lhs) != INTEGER_CST && TREE_CODE (rhs) != INTEGER_CST) | |
b666e568 | 8908 | { |
aa18f65a EB |
8909 | /* Never inline a 64-bit mult for a 32-bit target, it's way too long. */ |
8910 | if (code == MULT_EXPR && precision == 64 && BITS_PER_WORD < 64) | |
f7ebc6a8 | 8911 | { |
aa18f65a | 8912 | tree int64 = gnat_type_for_size (64, 0); |
dddf8120 | 8913 | return convert (gnu_type, build_call_n_expr (mulv64_decl, 2, |
aa18f65a EB |
8914 | convert (int64, lhs), |
8915 | convert (int64, rhs))); | |
58e94443 | 8916 | } |
a7c43bbc | 8917 | |
aa18f65a | 8918 | enum internal_fn icode; |
4ae39383 | 8919 | |
aa18f65a | 8920 | switch (code) |
4ae39383 | 8921 | { |
aa18f65a EB |
8922 | case PLUS_EXPR: |
8923 | icode = IFN_ADD_OVERFLOW; | |
8924 | break; | |
8925 | case MINUS_EXPR: | |
8926 | icode = IFN_SUB_OVERFLOW; | |
8927 | break; | |
8928 | case MULT_EXPR: | |
8929 | icode = IFN_MUL_OVERFLOW; | |
8930 | break; | |
8931 | default: | |
8932 | gcc_unreachable (); | |
4ae39383 | 8933 | } |
aa18f65a EB |
8934 | |
8935 | tree gnu_ctype = build_complex_type (gnu_type); | |
8936 | tree call | |
8937 | = build_call_expr_internal_loc (UNKNOWN_LOCATION, icode, gnu_ctype, 2, | |
8938 | lhs, rhs); | |
8939 | tree tgt = save_expr (call); | |
8940 | gnu_expr = build1 (REALPART_EXPR, gnu_type, tgt); | |
8941 | check | |
8942 | = convert (boolean_type_node, build1 (IMAGPART_EXPR, gnu_type, tgt)); | |
8943 | return | |
8944 | emit_check (check, gnu_expr, CE_Overflow_Check_Failed, gnat_node); | |
4ae39383 | 8945 | } |
b666e568 | 8946 | |
aa18f65a EB |
8947 | /* If one operand is a constant, we expose the overflow condition to enable |
8948 | a subsequent simplication or even elimination. */ | |
b666e568 GB |
8949 | switch (code) |
8950 | { | |
8951 | case PLUS_EXPR: | |
aa18f65a EB |
8952 | sgn = tree_int_cst_sgn (rhs); |
8953 | if (sgn > 0) | |
8954 | /* When rhs > 0, overflow when lhs > type_max - rhs. */ | |
8955 | check = build_binary_op (GT_EXPR, boolean_type_node, lhs, | |
8956 | build_binary_op (MINUS_EXPR, gnu_type, | |
8957 | type_max, rhs)); | |
8958 | else if (sgn < 0) | |
8959 | /* When rhs < 0, overflow when lhs < type_min - rhs. */ | |
8960 | check = build_binary_op (LT_EXPR, boolean_type_node, lhs, | |
8961 | build_binary_op (MINUS_EXPR, gnu_type, | |
8962 | type_min, rhs)); | |
8963 | else | |
8964 | return gnu_expr; | |
b666e568 GB |
8965 | break; |
8966 | ||
8967 | case MINUS_EXPR: | |
aa18f65a EB |
8968 | if (TREE_CODE (lhs) == INTEGER_CST) |
8969 | { | |
8970 | sgn = tree_int_cst_sgn (lhs); | |
8971 | if (sgn > 0) | |
8972 | /* When lhs > 0, overflow when rhs < lhs - type_max. */ | |
8973 | check = build_binary_op (LT_EXPR, boolean_type_node, rhs, | |
8974 | build_binary_op (MINUS_EXPR, gnu_type, | |
8975 | lhs, type_max)); | |
8976 | else if (sgn < 0) | |
8977 | /* When lhs < 0, overflow when rhs > lhs - type_min. */ | |
8978 | check = build_binary_op (GT_EXPR, boolean_type_node, rhs, | |
8979 | build_binary_op (MINUS_EXPR, gnu_type, | |
8980 | lhs, type_min)); | |
8981 | else | |
8982 | return gnu_expr; | |
8983 | } | |
8984 | else | |
8985 | { | |
8986 | sgn = tree_int_cst_sgn (rhs); | |
8987 | if (sgn > 0) | |
8988 | /* When rhs > 0, overflow when lhs < type_min + rhs. */ | |
8989 | check = build_binary_op (LT_EXPR, boolean_type_node, lhs, | |
8990 | build_binary_op (PLUS_EXPR, gnu_type, | |
8991 | type_min, rhs)); | |
8992 | else if (sgn < 0) | |
8993 | /* When rhs < 0, overflow when lhs > type_max + rhs. */ | |
8994 | check = build_binary_op (GT_EXPR, boolean_type_node, lhs, | |
8995 | build_binary_op (PLUS_EXPR, gnu_type, | |
8996 | type_max, rhs)); | |
8997 | else | |
8998 | return gnu_expr; | |
8999 | } | |
b666e568 GB |
9000 | break; |
9001 | ||
9002 | case MULT_EXPR: | |
aa18f65a EB |
9003 | sgn = tree_int_cst_sgn (rhs); |
9004 | if (sgn > 0) | |
9005 | { | |
9006 | if (integer_onep (rhs)) | |
9007 | return gnu_expr; | |
9008 | ||
9009 | tree lb = build_binary_op (TRUNC_DIV_EXPR, gnu_type, type_min, rhs); | |
9010 | tree ub = build_binary_op (TRUNC_DIV_EXPR, gnu_type, type_max, rhs); | |
9011 | ||
9012 | /* When rhs > 1, overflow outside [type_min/rhs; type_max/rhs]. */ | |
9013 | check | |
9014 | = build_binary_op (TRUTH_ORIF_EXPR, boolean_type_node, | |
9015 | build_binary_op (LT_EXPR, boolean_type_node, | |
9016 | lhs, lb), | |
9017 | build_binary_op (GT_EXPR, boolean_type_node, | |
9018 | lhs, ub)); | |
9019 | } | |
9020 | else if (sgn < 0) | |
9021 | { | |
9022 | tree lb = build_binary_op (TRUNC_DIV_EXPR, gnu_type, type_max, rhs); | |
9023 | tree ub = build_binary_op (TRUNC_DIV_EXPR, gnu_type, type_min, rhs); | |
9024 | ||
9025 | if (integer_minus_onep (rhs)) | |
9026 | /* When rhs == -1, overflow if lhs == type_min. */ | |
9027 | check | |
9028 | = build_binary_op (EQ_EXPR, boolean_type_node, lhs, type_min); | |
9029 | else | |
9030 | /* When rhs < -1, overflow outside [type_max/rhs; type_min/rhs]. */ | |
9031 | check | |
9032 | = build_binary_op (TRUTH_ORIF_EXPR, boolean_type_node, | |
9033 | build_binary_op (LT_EXPR, boolean_type_node, | |
9034 | lhs, lb), | |
9035 | build_binary_op (GT_EXPR, boolean_type_node, | |
9036 | lhs, ub)); | |
9037 | } | |
9038 | else | |
9039 | return gnu_expr; | |
b666e568 GB |
9040 | break; |
9041 | ||
9042 | default: | |
7c775aca | 9043 | gcc_unreachable (); |
b666e568 GB |
9044 | } |
9045 | ||
10069d53 | 9046 | return emit_check (check, gnu_expr, CE_Overflow_Check_Failed, gnat_node); |
b666e568 GB |
9047 | } |
9048 | ||
a7c43bbc | 9049 | /* Emit code for a range check. GNU_EXPR is the expression to be checked, |
a1ab4c31 | 9050 | GNAT_RANGE_TYPE the gnat type or subtype containing the bounds against |
10069d53 EB |
9051 | which we have to check. GNAT_NODE is the GNAT node conveying the source |
9052 | location for which the error should be signaled. */ | |
a1ab4c31 AC |
9053 | |
9054 | static tree | |
10069d53 | 9055 | emit_range_check (tree gnu_expr, Entity_Id gnat_range_type, Node_Id gnat_node) |
a1ab4c31 AC |
9056 | { |
9057 | tree gnu_range_type = get_unpadded_type (gnat_range_type); | |
a1ab4c31 AC |
9058 | tree gnu_compare_type = get_base_type (TREE_TYPE (gnu_expr)); |
9059 | ||
9060 | /* If GNU_EXPR has GNAT_RANGE_TYPE as its base type, no check is needed. | |
9061 | This can for example happen when translating 'Val or 'Value. */ | |
9062 | if (gnu_compare_type == gnu_range_type) | |
9063 | return gnu_expr; | |
9064 | ||
b6ea6dbd EB |
9065 | /* Range checks can only be applied to types with ranges. */ |
9066 | gcc_assert (INTEGRAL_TYPE_P (gnu_range_type) | |
9067 | || SCALAR_FLOAT_TYPE_P (gnu_range_type)); | |
9068 | ||
a1ab4c31 AC |
9069 | /* If GNU_EXPR has an integral type that is narrower than GNU_RANGE_TYPE, |
9070 | we can't do anything since we might be truncating the bounds. No | |
9071 | check is needed in this case. */ | |
9072 | if (INTEGRAL_TYPE_P (TREE_TYPE (gnu_expr)) | |
9073 | && (TYPE_PRECISION (gnu_compare_type) | |
9074 | < TYPE_PRECISION (get_base_type (gnu_range_type)))) | |
9075 | return gnu_expr; | |
9076 | ||
1e17ef87 | 9077 | /* Checked expressions must be evaluated only once. */ |
7d7a1fe8 | 9078 | gnu_expr = gnat_protect_expr (gnu_expr); |
a1ab4c31 | 9079 | |
1139f2e8 | 9080 | /* Note that the form of the check is |
1e17ef87 EB |
9081 | (not (expr >= lo)) or (not (expr <= hi)) |
9082 | the reason for this slightly convoluted form is that NaNs | |
9083 | are not considered to be in range in the float case. */ | |
a1ab4c31 | 9084 | return emit_check |
1139f2e8 | 9085 | (build_binary_op (TRUTH_ORIF_EXPR, boolean_type_node, |
a1ab4c31 | 9086 | invert_truthvalue |
1139f2e8 | 9087 | (build_binary_op (GE_EXPR, boolean_type_node, |
b6ea6dbd EB |
9088 | convert (gnu_compare_type, gnu_expr), |
9089 | convert (gnu_compare_type, | |
9090 | TYPE_MIN_VALUE | |
9091 | (gnu_range_type)))), | |
a1ab4c31 | 9092 | invert_truthvalue |
1139f2e8 | 9093 | (build_binary_op (LE_EXPR, boolean_type_node, |
a1ab4c31 AC |
9094 | convert (gnu_compare_type, gnu_expr), |
9095 | convert (gnu_compare_type, | |
b6ea6dbd EB |
9096 | TYPE_MAX_VALUE |
9097 | (gnu_range_type))))), | |
10069d53 | 9098 | gnu_expr, CE_Range_Check_Failed, gnat_node); |
a1ab4c31 AC |
9099 | } |
9100 | \f | |
4e9a8214 EB |
9101 | /* GNU_COND contains the condition corresponding to an index, overflow or |
9102 | range check of value GNU_EXPR. Build a COND_EXPR that returns GNU_EXPR | |
9103 | if GNU_COND is false and raises a CONSTRAINT_ERROR if GNU_COND is true. | |
9104 | REASON is the code that says why the exception is raised. GNAT_NODE is | |
9105 | the node conveying the source location for which the error should be | |
9106 | signaled. | |
9107 | ||
9108 | We used to propagate TREE_SIDE_EFFECTS from GNU_EXPR to the COND_EXPR, | |
9109 | overwriting the setting inherited from the call statement, on the ground | |
9110 | that the expression need not be evaluated just for the check. However | |
9111 | that's incorrect because, in the GCC type system, its value is presumed | |
9112 | to be valid so its comparison against the type bounds always yields true | |
9113 | and, therefore, could be done without evaluating it; given that it can | |
9114 | be a computation that overflows the bounds, the language may require the | |
9115 | check to fail and thus the expression to be evaluated in this case. */ | |
a1ab4c31 AC |
9116 | |
9117 | static tree | |
10069d53 | 9118 | emit_check (tree gnu_cond, tree gnu_expr, int reason, Node_Id gnat_node) |
a1ab4c31 | 9119 | { |
10069d53 EB |
9120 | tree gnu_call |
9121 | = build_call_raise (reason, gnat_node, N_Raise_Constraint_Error); | |
4e9a8214 EB |
9122 | return |
9123 | fold_build3 (COND_EXPR, TREE_TYPE (gnu_expr), gnu_cond, | |
9124 | build2 (COMPOUND_EXPR, TREE_TYPE (gnu_expr), gnu_call, | |
9a1bdc31 EB |
9125 | SCALAR_FLOAT_TYPE_P (TREE_TYPE (gnu_expr)) |
9126 | ? build_real (TREE_TYPE (gnu_expr), dconst0) | |
9127 | : build_int_cst (TREE_TYPE (gnu_expr), 0)), | |
4e9a8214 | 9128 | gnu_expr); |
a1ab4c31 AC |
9129 | } |
9130 | \f | |
1e17ef87 EB |
9131 | /* Return an expression that converts GNU_EXPR to GNAT_TYPE, doing overflow |
9132 | checks if OVERFLOW_P is true and range checks if RANGE_P is true. | |
9133 | GNAT_TYPE is known to be an integral type. If TRUNCATE_P true, do a | |
10069d53 EB |
9134 | float to integer conversion with truncation; otherwise round. |
9135 | GNAT_NODE is the GNAT node conveying the source location for which the | |
9136 | error should be signaled. */ | |
a1ab4c31 AC |
9137 | |
9138 | static tree | |
9139 | convert_with_check (Entity_Id gnat_type, tree gnu_expr, bool overflowp, | |
10069d53 | 9140 | bool rangep, bool truncatep, Node_Id gnat_node) |
a1ab4c31 AC |
9141 | { |
9142 | tree gnu_type = get_unpadded_type (gnat_type); | |
9143 | tree gnu_in_type = TREE_TYPE (gnu_expr); | |
9144 | tree gnu_in_basetype = get_base_type (gnu_in_type); | |
9145 | tree gnu_base_type = get_base_type (gnu_type); | |
9146 | tree gnu_result = gnu_expr; | |
9147 | ||
1eb58520 AC |
9148 | /* If we are not doing any checks, the output is an integral type and the |
9149 | input is not a floating-point type, just do the conversion. This is | |
9150 | required for packed array types and is simpler in all cases anyway. */ | |
9151 | if (!rangep | |
9152 | && !overflowp | |
9153 | && INTEGRAL_TYPE_P (gnu_base_type) | |
a1ab4c31 AC |
9154 | && !FLOAT_TYPE_P (gnu_in_type)) |
9155 | return convert (gnu_type, gnu_expr); | |
9156 | ||
9157 | /* First convert the expression to its base type. This | |
9158 | will never generate code, but makes the tests below much simpler. | |
9159 | But don't do this if converting from an integer type to an unconstrained | |
9160 | array type since then we need to get the bounds from the original | |
9161 | (unpacked) type. */ | |
9162 | if (TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE) | |
9163 | gnu_result = convert (gnu_in_basetype, gnu_result); | |
9164 | ||
9165 | /* If overflow checks are requested, we need to be sure the result will | |
9166 | fit in the output base type. But don't do this if the input | |
9167 | is integer and the output floating-point. */ | |
9168 | if (overflowp | |
9169 | && !(FLOAT_TYPE_P (gnu_base_type) && INTEGRAL_TYPE_P (gnu_in_basetype))) | |
9170 | { | |
9171 | /* Ensure GNU_EXPR only gets evaluated once. */ | |
7d7a1fe8 | 9172 | tree gnu_input = gnat_protect_expr (gnu_result); |
bf6490b5 | 9173 | tree gnu_cond = boolean_false_node; |
a1ab4c31 AC |
9174 | tree gnu_in_lb = TYPE_MIN_VALUE (gnu_in_basetype); |
9175 | tree gnu_in_ub = TYPE_MAX_VALUE (gnu_in_basetype); | |
9176 | tree gnu_out_lb = TYPE_MIN_VALUE (gnu_base_type); | |
9177 | tree gnu_out_ub = TYPE_MAX_VALUE (gnu_base_type); | |
9178 | ||
9179 | /* Convert the lower bounds to signed types, so we're sure we're | |
9180 | comparing them properly. Likewise, convert the upper bounds | |
9181 | to unsigned types. */ | |
9182 | if (INTEGRAL_TYPE_P (gnu_in_basetype) && TYPE_UNSIGNED (gnu_in_basetype)) | |
9a1bdc31 EB |
9183 | gnu_in_lb |
9184 | = convert (gnat_signed_type_for (gnu_in_basetype), gnu_in_lb); | |
a1ab4c31 AC |
9185 | |
9186 | if (INTEGRAL_TYPE_P (gnu_in_basetype) | |
9187 | && !TYPE_UNSIGNED (gnu_in_basetype)) | |
9a1bdc31 EB |
9188 | gnu_in_ub |
9189 | = convert (gnat_unsigned_type_for (gnu_in_basetype), gnu_in_ub); | |
a1ab4c31 AC |
9190 | |
9191 | if (INTEGRAL_TYPE_P (gnu_base_type) && TYPE_UNSIGNED (gnu_base_type)) | |
9a1bdc31 EB |
9192 | gnu_out_lb |
9193 | = convert (gnat_signed_type_for (gnu_base_type), gnu_out_lb); | |
a1ab4c31 AC |
9194 | |
9195 | if (INTEGRAL_TYPE_P (gnu_base_type) && !TYPE_UNSIGNED (gnu_base_type)) | |
9a1bdc31 EB |
9196 | gnu_out_ub |
9197 | = convert (gnat_unsigned_type_for (gnu_base_type), gnu_out_ub); | |
a1ab4c31 AC |
9198 | |
9199 | /* Check each bound separately and only if the result bound | |
9200 | is tighter than the bound on the input type. Note that all the | |
9201 | types are base types, so the bounds must be constant. Also, | |
9202 | the comparison is done in the base type of the input, which | |
9203 | always has the proper signedness. First check for input | |
9204 | integer (which means output integer), output float (which means | |
9205 | both float), or mixed, in which case we always compare. | |
9206 | Note that we have to do the comparison which would *fail* in the | |
9207 | case of an error since if it's an FP comparison and one of the | |
9208 | values is a NaN or Inf, the comparison will fail. */ | |
9209 | if (INTEGRAL_TYPE_P (gnu_in_basetype) | |
9210 | ? tree_int_cst_lt (gnu_in_lb, gnu_out_lb) | |
9211 | : (FLOAT_TYPE_P (gnu_base_type) | |
8cb41028 RS |
9212 | ? real_less (&TREE_REAL_CST (gnu_in_lb), |
9213 | &TREE_REAL_CST (gnu_out_lb)) | |
a1ab4c31 AC |
9214 | : 1)) |
9215 | gnu_cond | |
9216 | = invert_truthvalue | |
1139f2e8 | 9217 | (build_binary_op (GE_EXPR, boolean_type_node, |
a1ab4c31 AC |
9218 | gnu_input, convert (gnu_in_basetype, |
9219 | gnu_out_lb))); | |
9220 | ||
9221 | if (INTEGRAL_TYPE_P (gnu_in_basetype) | |
9222 | ? tree_int_cst_lt (gnu_out_ub, gnu_in_ub) | |
9223 | : (FLOAT_TYPE_P (gnu_base_type) | |
8cb41028 RS |
9224 | ? real_less (&TREE_REAL_CST (gnu_out_ub), |
9225 | &TREE_REAL_CST (gnu_in_lb)) | |
a1ab4c31 AC |
9226 | : 1)) |
9227 | gnu_cond | |
1139f2e8 | 9228 | = build_binary_op (TRUTH_ORIF_EXPR, boolean_type_node, gnu_cond, |
a1ab4c31 | 9229 | invert_truthvalue |
1139f2e8 | 9230 | (build_binary_op (LE_EXPR, boolean_type_node, |
a1ab4c31 AC |
9231 | gnu_input, |
9232 | convert (gnu_in_basetype, | |
9233 | gnu_out_ub)))); | |
9234 | ||
9235 | if (!integer_zerop (gnu_cond)) | |
10069d53 EB |
9236 | gnu_result = emit_check (gnu_cond, gnu_input, |
9237 | CE_Overflow_Check_Failed, gnat_node); | |
a1ab4c31 AC |
9238 | } |
9239 | ||
9240 | /* Now convert to the result base type. If this is a non-truncating | |
9241 | float-to-integer conversion, round. */ | |
24228312 AC |
9242 | if (INTEGRAL_TYPE_P (gnu_base_type) |
9243 | && FLOAT_TYPE_P (gnu_in_basetype) | |
a1ab4c31 AC |
9244 | && !truncatep) |
9245 | { | |
9246 | REAL_VALUE_TYPE half_minus_pred_half, pred_half; | |
ced57283 | 9247 | tree gnu_conv, gnu_zero, gnu_comp, calc_type; |
a1ab4c31 AC |
9248 | tree gnu_pred_half, gnu_add_pred_half, gnu_subtract_pred_half; |
9249 | const struct real_format *fmt; | |
9250 | ||
9251 | /* The following calculations depend on proper rounding to even | |
24228312 | 9252 | of each arithmetic operation. In order to prevent excess |
1e17ef87 EB |
9253 | precision from spoiling this property, use the widest hardware |
9254 | floating-point type if FP_ARITH_MAY_WIDEN is true. */ | |
9255 | calc_type | |
24228312 | 9256 | = fp_arith_may_widen ? longest_float_type_node : gnu_in_basetype; |
a1ab4c31 | 9257 | |
1e17ef87 | 9258 | /* Compute the exact value calc_type'Pred (0.5) at compile time. */ |
a1ab4c31 AC |
9259 | fmt = REAL_MODE_FORMAT (TYPE_MODE (calc_type)); |
9260 | real_2expN (&half_minus_pred_half, -(fmt->p) - 1, TYPE_MODE (calc_type)); | |
5c88ea94 RS |
9261 | real_arithmetic (&pred_half, MINUS_EXPR, &dconsthalf, |
9262 | &half_minus_pred_half); | |
a1ab4c31 AC |
9263 | gnu_pred_half = build_real (calc_type, pred_half); |
9264 | ||
9265 | /* If the input is strictly negative, subtract this value | |
ced57283 | 9266 | and otherwise add it from the input. For 0.5, the result |
1e17ef87 | 9267 | is exactly between 1.0 and the machine number preceding 1.0 |
ced57283 | 9268 | (for calc_type). Since the last bit of 1.0 is even, this 0.5 |
1e17ef87 | 9269 | will round to 1.0, while all other number with an absolute |
ced57283 | 9270 | value less than 0.5 round to 0.0. For larger numbers exactly |
1e17ef87 EB |
9271 | halfway between integers, rounding will always be correct as |
9272 | the true mathematical result will be closer to the higher | |
ced57283 | 9273 | integer compared to the lower one. So, this constant works |
1e17ef87 EB |
9274 | for all floating-point numbers. |
9275 | ||
9276 | The reason to use the same constant with subtract/add instead | |
9277 | of a positive and negative constant is to allow the comparison | |
9278 | to be scheduled in parallel with retrieval of the constant and | |
9279 | conversion of the input to the calc_type (if necessary). */ | |
a1ab4c31 | 9280 | |
9a1bdc31 | 9281 | gnu_zero = build_real (gnu_in_basetype, dconst0); |
7d7a1fe8 | 9282 | gnu_result = gnat_protect_expr (gnu_result); |
ced57283 EB |
9283 | gnu_conv = convert (calc_type, gnu_result); |
9284 | gnu_comp | |
1139f2e8 | 9285 | = fold_build2 (GE_EXPR, boolean_type_node, gnu_result, gnu_zero); |
a1ab4c31 | 9286 | gnu_add_pred_half |
ced57283 | 9287 | = fold_build2 (PLUS_EXPR, calc_type, gnu_conv, gnu_pred_half); |
a1ab4c31 | 9288 | gnu_subtract_pred_half |
ced57283 EB |
9289 | = fold_build2 (MINUS_EXPR, calc_type, gnu_conv, gnu_pred_half); |
9290 | gnu_result = fold_build3 (COND_EXPR, calc_type, gnu_comp, | |
9291 | gnu_add_pred_half, gnu_subtract_pred_half); | |
a1ab4c31 AC |
9292 | } |
9293 | ||
9294 | if (TREE_CODE (gnu_base_type) == INTEGER_TYPE | |
9295 | && TYPE_HAS_ACTUAL_BOUNDS_P (gnu_base_type) | |
9296 | && TREE_CODE (gnu_result) == UNCONSTRAINED_ARRAY_REF) | |
9297 | gnu_result = unchecked_convert (gnu_base_type, gnu_result, false); | |
9298 | else | |
9299 | gnu_result = convert (gnu_base_type, gnu_result); | |
9300 | ||
ced57283 EB |
9301 | /* Finally, do the range check if requested. Note that if the result type |
9302 | is a modular type, the range check is actually an overflow check. */ | |
a1ab4c31 AC |
9303 | if (rangep |
9304 | || (TREE_CODE (gnu_base_type) == INTEGER_TYPE | |
9305 | && TYPE_MODULAR_P (gnu_base_type) && overflowp)) | |
10069d53 | 9306 | gnu_result = emit_range_check (gnu_result, gnat_type, gnat_node); |
a1ab4c31 AC |
9307 | |
9308 | return convert (gnu_type, gnu_result); | |
9309 | } | |
9310 | \f | |
a1ab4c31 AC |
9311 | /* Return true if GNU_EXPR can be directly addressed. This is the case |
9312 | unless it is an expression involving computation or if it involves a | |
9313 | reference to a bitfield or to an object not sufficiently aligned for | |
9314 | its type. If GNU_TYPE is non-null, return true only if GNU_EXPR can | |
9315 | be directly addressed as an object of this type. | |
9316 | ||
9317 | *** Notes on addressability issues in the Ada compiler *** | |
9318 | ||
9319 | This predicate is necessary in order to bridge the gap between Gigi | |
9320 | and the middle-end about addressability of GENERIC trees. A tree | |
9321 | is said to be addressable if it can be directly addressed, i.e. if | |
9322 | its address can be taken, is a multiple of the type's alignment on | |
9323 | strict-alignment architectures and returns the first storage unit | |
9324 | assigned to the object represented by the tree. | |
9325 | ||
9326 | In the C family of languages, everything is in practice addressable | |
9327 | at the language level, except for bit-fields. This means that these | |
9328 | compilers will take the address of any tree that doesn't represent | |
9329 | a bit-field reference and expect the result to be the first storage | |
9330 | unit assigned to the object. Even in cases where this will result | |
9331 | in unaligned accesses at run time, nothing is supposed to be done | |
9332 | and the program is considered as erroneous instead (see PR c/18287). | |
9333 | ||
9334 | The implicit assumptions made in the middle-end are in keeping with | |
9335 | the C viewpoint described above: | |
9336 | - the address of a bit-field reference is supposed to be never | |
9337 | taken; the compiler (generally) will stop on such a construct, | |
9338 | - any other tree is addressable if it is formally addressable, | |
9339 | i.e. if it is formally allowed to be the operand of ADDR_EXPR. | |
9340 | ||
9341 | In Ada, the viewpoint is the opposite one: nothing is addressable | |
9342 | at the language level unless explicitly declared so. This means | |
9343 | that the compiler will both make sure that the trees representing | |
9344 | references to addressable ("aliased" in Ada parlance) objects are | |
9345 | addressable and make no real attempts at ensuring that the trees | |
9346 | representing references to non-addressable objects are addressable. | |
9347 | ||
9348 | In the first case, Ada is effectively equivalent to C and handing | |
9349 | down the direct result of applying ADDR_EXPR to these trees to the | |
9350 | middle-end works flawlessly. In the second case, Ada cannot afford | |
9351 | to consider the program as erroneous if the address of trees that | |
9352 | are not addressable is requested for technical reasons, unlike C; | |
9353 | as a consequence, the Ada compiler must arrange for either making | |
9354 | sure that this address is not requested in the middle-end or for | |
9355 | compensating by inserting temporaries if it is requested in Gigi. | |
9356 | ||
9357 | The first goal can be achieved because the middle-end should not | |
9358 | request the address of non-addressable trees on its own; the only | |
9359 | exception is for the invocation of low-level block operations like | |
9360 | memcpy, for which the addressability requirements are lower since | |
9361 | the type's alignment can be disregarded. In practice, this means | |
9362 | that Gigi must make sure that such operations cannot be applied to | |
9363 | non-BLKmode bit-fields. | |
9364 | ||
5a19bc0a EB |
9365 | The second goal is achieved by means of the addressable_p predicate, |
9366 | which computes whether a temporary must be inserted by Gigi when the | |
9367 | address of a tree is requested; if so, the address of the temporary | |
9368 | will be used in lieu of that of the original tree and some glue code | |
9369 | generated to connect everything together. */ | |
a1ab4c31 AC |
9370 | |
9371 | static bool | |
9372 | addressable_p (tree gnu_expr, tree gnu_type) | |
9373 | { | |
169afcb9 EB |
9374 | /* For an integral type, the size of the actual type of the object may not |
9375 | be greater than that of the expected type, otherwise an indirect access | |
9376 | in the latter type wouldn't correctly set all the bits of the object. */ | |
9377 | if (gnu_type | |
9378 | && INTEGRAL_TYPE_P (gnu_type) | |
9379 | && smaller_form_type_p (gnu_type, TREE_TYPE (gnu_expr))) | |
9380 | return false; | |
9381 | ||
9382 | /* The size of the actual type of the object may not be smaller than that | |
9383 | of the expected type, otherwise an indirect access in the latter type | |
9384 | would be larger than the object. But only record types need to be | |
9385 | considered in practice for this case. */ | |
a1ab4c31 AC |
9386 | if (gnu_type |
9387 | && TREE_CODE (gnu_type) == RECORD_TYPE | |
169afcb9 | 9388 | && smaller_form_type_p (TREE_TYPE (gnu_expr), gnu_type)) |
a1ab4c31 AC |
9389 | return false; |
9390 | ||
9391 | switch (TREE_CODE (gnu_expr)) | |
9392 | { | |
9393 | case VAR_DECL: | |
9394 | case PARM_DECL: | |
9395 | case FUNCTION_DECL: | |
9396 | case RESULT_DECL: | |
9397 | /* All DECLs are addressable: if they are in a register, we can force | |
9398 | them to memory. */ | |
9399 | return true; | |
9400 | ||
9401 | case UNCONSTRAINED_ARRAY_REF: | |
9402 | case INDIRECT_REF: | |
0b3467c4 | 9403 | /* Taking the address of a dereference yields the original pointer. */ |
42c08997 EB |
9404 | return true; |
9405 | ||
a1ab4c31 AC |
9406 | case STRING_CST: |
9407 | case INTEGER_CST: | |
0b3467c4 EB |
9408 | /* Taking the address yields a pointer to the constant pool. */ |
9409 | return true; | |
9410 | ||
9411 | case CONSTRUCTOR: | |
9412 | /* Taking the address of a static constructor yields a pointer to the | |
9413 | tree constant pool. */ | |
9414 | return TREE_STATIC (gnu_expr) ? true : false; | |
9415 | ||
a1ab4c31 AC |
9416 | case NULL_EXPR: |
9417 | case SAVE_EXPR: | |
9418 | case CALL_EXPR: | |
42c08997 EB |
9419 | case PLUS_EXPR: |
9420 | case MINUS_EXPR: | |
9f4afcd4 EB |
9421 | case BIT_IOR_EXPR: |
9422 | case BIT_XOR_EXPR: | |
9423 | case BIT_AND_EXPR: | |
9424 | case BIT_NOT_EXPR: | |
42c08997 EB |
9425 | /* All rvalues are deemed addressable since taking their address will |
9426 | force a temporary to be created by the middle-end. */ | |
a1ab4c31 AC |
9427 | return true; |
9428 | ||
0b3467c4 EB |
9429 | case COMPOUND_EXPR: |
9430 | /* The address of a compound expression is that of its 2nd operand. */ | |
9431 | return addressable_p (TREE_OPERAND (gnu_expr, 1), gnu_type); | |
9432 | ||
a1ab4c31 AC |
9433 | case COND_EXPR: |
9434 | /* We accept &COND_EXPR as soon as both operands are addressable and | |
9435 | expect the outcome to be the address of the selected operand. */ | |
9436 | return (addressable_p (TREE_OPERAND (gnu_expr, 1), NULL_TREE) | |
9437 | && addressable_p (TREE_OPERAND (gnu_expr, 2), NULL_TREE)); | |
9438 | ||
9439 | case COMPONENT_REF: | |
9440 | return (((!DECL_BIT_FIELD (TREE_OPERAND (gnu_expr, 1)) | |
9441 | /* Even with DECL_BIT_FIELD cleared, we have to ensure that | |
9442 | the field is sufficiently aligned, in case it is subject | |
9443 | to a pragma Component_Alignment. But we don't need to | |
9444 | check the alignment of the containing record, as it is | |
9445 | guaranteed to be not smaller than that of its most | |
9446 | aligned field that is not a bit-field. */ | |
1e17ef87 | 9447 | && (!STRICT_ALIGNMENT |
a1ab4c31 AC |
9448 | || DECL_ALIGN (TREE_OPERAND (gnu_expr, 1)) |
9449 | >= TYPE_ALIGN (TREE_TYPE (gnu_expr)))) | |
9450 | /* The field of a padding record is always addressable. */ | |
3c157c27 | 9451 | || TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))) |
a1ab4c31 AC |
9452 | && addressable_p (TREE_OPERAND (gnu_expr, 0), NULL_TREE)); |
9453 | ||
9454 | case ARRAY_REF: case ARRAY_RANGE_REF: | |
9455 | case REALPART_EXPR: case IMAGPART_EXPR: | |
9456 | case NOP_EXPR: | |
9457 | return addressable_p (TREE_OPERAND (gnu_expr, 0), NULL_TREE); | |
9458 | ||
9459 | case CONVERT_EXPR: | |
9460 | return (AGGREGATE_TYPE_P (TREE_TYPE (gnu_expr)) | |
9461 | && addressable_p (TREE_OPERAND (gnu_expr, 0), NULL_TREE)); | |
9462 | ||
9463 | case VIEW_CONVERT_EXPR: | |
9464 | { | |
9465 | /* This is addressable if we can avoid a copy. */ | |
9466 | tree type = TREE_TYPE (gnu_expr); | |
9467 | tree inner_type = TREE_TYPE (TREE_OPERAND (gnu_expr, 0)); | |
9468 | return (((TYPE_MODE (type) == TYPE_MODE (inner_type) | |
9469 | && (!STRICT_ALIGNMENT | |
9470 | || TYPE_ALIGN (type) <= TYPE_ALIGN (inner_type) | |
9471 | || TYPE_ALIGN (inner_type) >= BIGGEST_ALIGNMENT)) | |
9472 | || ((TYPE_MODE (type) == BLKmode | |
9473 | || TYPE_MODE (inner_type) == BLKmode) | |
9474 | && (!STRICT_ALIGNMENT | |
9475 | || TYPE_ALIGN (type) <= TYPE_ALIGN (inner_type) | |
9476 | || TYPE_ALIGN (inner_type) >= BIGGEST_ALIGNMENT | |
9477 | || TYPE_ALIGN_OK (type) | |
9478 | || TYPE_ALIGN_OK (inner_type)))) | |
9479 | && addressable_p (TREE_OPERAND (gnu_expr, 0), NULL_TREE)); | |
9480 | } | |
9481 | ||
9482 | default: | |
9483 | return false; | |
9484 | } | |
9485 | } | |
9486 | \f | |
d5ebeb8c EB |
9487 | /* Do the processing for the declaration of a GNAT_ENTITY, a type or subtype. |
9488 | If a Freeze node exists for the entity, delay the bulk of the processing. | |
9489 | Otherwise make a GCC type for GNAT_ENTITY and set up the correspondence. */ | |
a1ab4c31 AC |
9490 | |
9491 | void | |
9492 | process_type (Entity_Id gnat_entity) | |
9493 | { | |
9494 | tree gnu_old | |
d5ebeb8c EB |
9495 | = present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity) : NULL_TREE; |
9496 | ||
9497 | /* If we are to delay elaboration of this type, just do any elaboration | |
9498 | needed for expressions within the declaration and make a dummy node | |
9499 | for it and its Full_View (if any), in case something points to it. | |
9500 | Do not do this if it has already been done (the only way that can | |
9501 | happen is if the private completion is also delayed). */ | |
9502 | if (Present (Freeze_Node (gnat_entity))) | |
a1ab4c31 AC |
9503 | { |
9504 | elaborate_entity (gnat_entity); | |
9505 | ||
9506 | if (!gnu_old) | |
1e17ef87 | 9507 | { |
10069d53 | 9508 | tree gnu_decl = TYPE_STUB_DECL (make_dummy_type (gnat_entity)); |
a1ab4c31 AC |
9509 | save_gnu_tree (gnat_entity, gnu_decl, false); |
9510 | if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind) | |
9511 | && Present (Full_View (gnat_entity))) | |
65444786 EB |
9512 | { |
9513 | if (Has_Completion_In_Body (gnat_entity)) | |
9514 | DECL_TAFT_TYPE_P (gnu_decl) = 1; | |
9515 | save_gnu_tree (Full_View (gnat_entity), gnu_decl, false); | |
9516 | } | |
a1ab4c31 AC |
9517 | } |
9518 | ||
9519 | return; | |
9520 | } | |
9521 | ||
d5ebeb8c EB |
9522 | /* If we saved away a dummy type for this node, it means that this made the |
9523 | type that corresponds to the full type of an incomplete type. Clear that | |
5a4916be EB |
9524 | type for now and then update the type in the pointers below. But, if the |
9525 | saved type is not dummy, it very likely means that we have a use before | |
9526 | declaration for the type in the tree, what we really cannot handle. */ | |
a1ab4c31 AC |
9527 | if (gnu_old) |
9528 | { | |
9529 | gcc_assert (TREE_CODE (gnu_old) == TYPE_DECL | |
9530 | && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old))); | |
9531 | ||
9532 | save_gnu_tree (gnat_entity, NULL_TREE, false); | |
9533 | } | |
9534 | ||
9535 | /* Now fully elaborate the type. */ | |
d5ebeb8c | 9536 | tree gnu_new = gnat_to_gnu_entity (gnat_entity, NULL_TREE, true); |
a1ab4c31 AC |
9537 | gcc_assert (TREE_CODE (gnu_new) == TYPE_DECL); |
9538 | ||
65444786 EB |
9539 | /* If we have an old type and we've made pointers to this type, update those |
9540 | pointers. If this is a Taft amendment type in the main unit, we need to | |
9541 | mark the type as used since other units referencing it don't see the full | |
9542 | declaration and, therefore, cannot mark it as used themselves. */ | |
a1ab4c31 | 9543 | if (gnu_old) |
65444786 EB |
9544 | { |
9545 | update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old)), | |
9546 | TREE_TYPE (gnu_new)); | |
9547 | if (DECL_TAFT_TYPE_P (gnu_old)) | |
9548 | used_types_insert (TREE_TYPE (gnu_new)); | |
9549 | } | |
a1ab4c31 AC |
9550 | |
9551 | /* If this is a record type corresponding to a task or protected type | |
9552 | that is a completion of an incomplete type, perform a similar update | |
1e17ef87 | 9553 | on the type. ??? Including protected types here is a guess. */ |
a1ab4c31 AC |
9554 | if (IN (Ekind (gnat_entity), Record_Kind) |
9555 | && Is_Concurrent_Record_Type (gnat_entity) | |
9556 | && present_gnu_tree (Corresponding_Concurrent_Type (gnat_entity))) | |
9557 | { | |
9558 | tree gnu_task_old | |
9559 | = get_gnu_tree (Corresponding_Concurrent_Type (gnat_entity)); | |
9560 | ||
9561 | save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity), | |
9562 | NULL_TREE, false); | |
9563 | save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity), | |
9564 | gnu_new, false); | |
9565 | ||
9566 | update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_task_old)), | |
9567 | TREE_TYPE (gnu_new)); | |
9568 | } | |
9569 | } | |
9570 | \f | |
42acad07 EB |
9571 | /* GNAT_ENTITY is the type of the resulting constructor, GNAT_ASSOC is the |
9572 | front of the Component_Associations of an N_Aggregate and GNU_TYPE is the | |
9573 | GCC type of the corresponding record type. Return the CONSTRUCTOR. */ | |
a1ab4c31 AC |
9574 | |
9575 | static tree | |
9576 | assoc_to_constructor (Entity_Id gnat_entity, Node_Id gnat_assoc, tree gnu_type) | |
9577 | { | |
42acad07 | 9578 | tree gnu_list = NULL_TREE, gnu_result; |
a1ab4c31 AC |
9579 | |
9580 | /* We test for GNU_FIELD being empty in the case where a variant | |
9581 | was the last thing since we don't take things off GNAT_ASSOC in | |
9582 | that case. We check GNAT_ASSOC in case we have a variant, but it | |
9583 | has no fields. */ | |
9584 | ||
42acad07 | 9585 | for (; Present (gnat_assoc); gnat_assoc = Next (gnat_assoc)) |
a1ab4c31 AC |
9586 | { |
9587 | Node_Id gnat_field = First (Choices (gnat_assoc)); | |
9588 | tree gnu_field = gnat_to_gnu_field_decl (Entity (gnat_field)); | |
9589 | tree gnu_expr = gnat_to_gnu (Expression (gnat_assoc)); | |
9590 | ||
9591 | /* The expander is supposed to put a single component selector name | |
1e17ef87 | 9592 | in every record component association. */ |
a1ab4c31 AC |
9593 | gcc_assert (No (Next (gnat_field))); |
9594 | ||
9595 | /* Ignore fields that have Corresponding_Discriminants since we'll | |
9596 | be setting that field in the parent. */ | |
9597 | if (Present (Corresponding_Discriminant (Entity (gnat_field))) | |
9598 | && Is_Tagged_Type (Scope (Entity (gnat_field)))) | |
9599 | continue; | |
9600 | ||
9601 | /* Also ignore discriminants of Unchecked_Unions. */ | |
42acad07 EB |
9602 | if (Is_Unchecked_Union (gnat_entity) |
9603 | && Ekind (Entity (gnat_field)) == E_Discriminant) | |
a1ab4c31 AC |
9604 | continue; |
9605 | ||
9606 | /* Before assigning a value in an aggregate make sure range checks | |
9607 | are done if required. Then convert to the type of the field. */ | |
9608 | if (Do_Range_Check (Expression (gnat_assoc))) | |
10069d53 | 9609 | gnu_expr = emit_range_check (gnu_expr, Etype (gnat_field), Empty); |
a1ab4c31 AC |
9610 | |
9611 | gnu_expr = convert (TREE_TYPE (gnu_field), gnu_expr); | |
9612 | ||
9613 | /* Add the field and expression to the list. */ | |
9614 | gnu_list = tree_cons (gnu_field, gnu_expr, gnu_list); | |
9615 | } | |
9616 | ||
9617 | gnu_result = extract_values (gnu_list, gnu_type); | |
9618 | ||
9abe8b74 MM |
9619 | if (flag_checking) |
9620 | { | |
9621 | /* Verify that every entry in GNU_LIST was used. */ | |
9622 | for (; gnu_list; gnu_list = TREE_CHAIN (gnu_list)) | |
9623 | gcc_assert (TREE_ADDRESSABLE (gnu_list)); | |
9624 | } | |
a1ab4c31 AC |
9625 | |
9626 | return gnu_result; | |
9627 | } | |
9628 | ||
1e17ef87 EB |
9629 | /* Build a possibly nested constructor for array aggregates. GNAT_EXPR is |
9630 | the first element of an array aggregate. It may itself be an aggregate. | |
9631 | GNU_ARRAY_TYPE is the GCC type corresponding to the array aggregate. | |
9632 | GNAT_COMPONENT_TYPE is the type of the array component; it is needed | |
9633 | for range checking. */ | |
a1ab4c31 AC |
9634 | |
9635 | static tree | |
9636 | pos_to_constructor (Node_Id gnat_expr, tree gnu_array_type, | |
1e17ef87 | 9637 | Entity_Id gnat_component_type) |
a1ab4c31 | 9638 | { |
a1ab4c31 AC |
9639 | tree gnu_index = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_array_type)); |
9640 | tree gnu_expr; | |
9771b263 | 9641 | vec<constructor_elt, va_gc> *gnu_expr_vec = NULL; |
a1ab4c31 AC |
9642 | |
9643 | for ( ; Present (gnat_expr); gnat_expr = Next (gnat_expr)) | |
9644 | { | |
9645 | /* If the expression is itself an array aggregate then first build the | |
9646 | innermost constructor if it is part of our array (multi-dimensional | |
9647 | case). */ | |
a1ab4c31 AC |
9648 | if (Nkind (gnat_expr) == N_Aggregate |
9649 | && TREE_CODE (TREE_TYPE (gnu_array_type)) == ARRAY_TYPE | |
9650 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_array_type))) | |
9651 | gnu_expr = pos_to_constructor (First (Expressions (gnat_expr)), | |
9652 | TREE_TYPE (gnu_array_type), | |
9653 | gnat_component_type); | |
9654 | else | |
9655 | { | |
9656 | gnu_expr = gnat_to_gnu (gnat_expr); | |
9657 | ||
10069d53 | 9658 | /* Before assigning the element to the array, make sure it is |
1e17ef87 | 9659 | in range. */ |
a1ab4c31 | 9660 | if (Do_Range_Check (gnat_expr)) |
10069d53 | 9661 | gnu_expr = emit_range_check (gnu_expr, gnat_component_type, Empty); |
a1ab4c31 AC |
9662 | } |
9663 | ||
0e228dd9 NF |
9664 | CONSTRUCTOR_APPEND_ELT (gnu_expr_vec, gnu_index, |
9665 | convert (TREE_TYPE (gnu_array_type), gnu_expr)); | |
a1ab4c31 | 9666 | |
8b9aec86 RS |
9667 | gnu_index = int_const_binop (PLUS_EXPR, gnu_index, |
9668 | convert (TREE_TYPE (gnu_index), | |
9669 | integer_one_node)); | |
a1ab4c31 AC |
9670 | } |
9671 | ||
0e228dd9 | 9672 | return gnat_build_constructor (gnu_array_type, gnu_expr_vec); |
a1ab4c31 AC |
9673 | } |
9674 | \f | |
9675 | /* Subroutine of assoc_to_constructor: VALUES is a list of field associations, | |
f797c2b7 EB |
9676 | some of which are from RECORD_TYPE. Return a CONSTRUCTOR consisting of the |
9677 | associations that are from RECORD_TYPE. If we see an internal record, make | |
9678 | a recursive call to fill it in as well. */ | |
a1ab4c31 AC |
9679 | |
9680 | static tree | |
9681 | extract_values (tree values, tree record_type) | |
9682 | { | |
a1ab4c31 | 9683 | tree field, tem; |
9771b263 | 9684 | vec<constructor_elt, va_gc> *v = NULL; |
a1ab4c31 | 9685 | |
910ad8de | 9686 | for (field = TYPE_FIELDS (record_type); field; field = DECL_CHAIN (field)) |
a1ab4c31 AC |
9687 | { |
9688 | tree value = 0; | |
9689 | ||
9690 | /* _Parent is an internal field, but may have values in the aggregate, | |
9691 | so check for values first. */ | |
9692 | if ((tem = purpose_member (field, values))) | |
9693 | { | |
9694 | value = TREE_VALUE (tem); | |
9695 | TREE_ADDRESSABLE (tem) = 1; | |
9696 | } | |
9697 | ||
9698 | else if (DECL_INTERNAL_P (field)) | |
9699 | { | |
9700 | value = extract_values (values, TREE_TYPE (field)); | |
9701 | if (TREE_CODE (value) == CONSTRUCTOR | |
9771b263 | 9702 | && vec_safe_is_empty (CONSTRUCTOR_ELTS (value))) |
a1ab4c31 AC |
9703 | value = 0; |
9704 | } | |
9705 | else | |
9706 | /* If we have a record subtype, the names will match, but not the | |
9707 | actual FIELD_DECLs. */ | |
9708 | for (tem = values; tem; tem = TREE_CHAIN (tem)) | |
9709 | if (DECL_NAME (TREE_PURPOSE (tem)) == DECL_NAME (field)) | |
9710 | { | |
9711 | value = convert (TREE_TYPE (field), TREE_VALUE (tem)); | |
9712 | TREE_ADDRESSABLE (tem) = 1; | |
9713 | } | |
9714 | ||
9715 | if (!value) | |
9716 | continue; | |
9717 | ||
0e228dd9 | 9718 | CONSTRUCTOR_APPEND_ELT (v, field, value); |
a1ab4c31 AC |
9719 | } |
9720 | ||
0e228dd9 | 9721 | return gnat_build_constructor (record_type, v); |
a1ab4c31 AC |
9722 | } |
9723 | \f | |
f04b8d69 EB |
9724 | /* Process a N_Validate_Unchecked_Conversion node. */ |
9725 | ||
9726 | static void | |
9727 | validate_unchecked_conversion (Node_Id gnat_node) | |
9728 | { | |
9729 | tree gnu_source_type = gnat_to_gnu_type (Source_Type (gnat_node)); | |
9730 | tree gnu_target_type = gnat_to_gnu_type (Target_Type (gnat_node)); | |
9731 | ||
9732 | /* If the target is a pointer type, see if we are either converting from a | |
9733 | non-pointer or from a pointer to a type with a different alias set and | |
9734 | warn if so, unless the pointer has been marked to alias everything. */ | |
9735 | if (POINTER_TYPE_P (gnu_target_type) | |
9736 | && !TYPE_REF_CAN_ALIAS_ALL (gnu_target_type)) | |
9737 | { | |
9738 | tree gnu_source_desig_type = POINTER_TYPE_P (gnu_source_type) | |
9739 | ? TREE_TYPE (gnu_source_type) | |
9740 | : NULL_TREE; | |
9741 | tree gnu_target_desig_type = TREE_TYPE (gnu_target_type); | |
9742 | alias_set_type target_alias_set = get_alias_set (gnu_target_desig_type); | |
9743 | ||
9744 | if (target_alias_set != 0 | |
9745 | && (!POINTER_TYPE_P (gnu_source_type) | |
9746 | || !alias_sets_conflict_p (get_alias_set (gnu_source_desig_type), | |
9747 | target_alias_set))) | |
9748 | { | |
9749 | post_error_ne ("?possible aliasing problem for type&", | |
9750 | gnat_node, Target_Type (gnat_node)); | |
9751 | post_error ("\\?use -fno-strict-aliasing switch for references", | |
9752 | gnat_node); | |
9753 | post_error_ne ("\\?or use `pragma No_Strict_Aliasing (&);`", | |
9754 | gnat_node, Target_Type (gnat_node)); | |
9755 | } | |
9756 | } | |
9757 | ||
9758 | /* Likewise if the target is a fat pointer type, but we have no mechanism to | |
9759 | mitigate the problem in this case, so we unconditionally warn. */ | |
9760 | else if (TYPE_IS_FAT_POINTER_P (gnu_target_type)) | |
9761 | { | |
9762 | tree gnu_source_desig_type | |
9763 | = TYPE_IS_FAT_POINTER_P (gnu_source_type) | |
9764 | ? TREE_TYPE (TREE_TYPE (TYPE_FIELDS (gnu_source_type))) | |
9765 | : NULL_TREE; | |
9766 | tree gnu_target_desig_type | |
9767 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (gnu_target_type))); | |
9768 | alias_set_type target_alias_set = get_alias_set (gnu_target_desig_type); | |
9769 | ||
9770 | if (target_alias_set != 0 | |
9771 | && (!TYPE_IS_FAT_POINTER_P (gnu_source_type) | |
9772 | || !alias_sets_conflict_p (get_alias_set (gnu_source_desig_type), | |
9773 | target_alias_set))) | |
9774 | { | |
9775 | post_error_ne ("?possible aliasing problem for type&", | |
9776 | gnat_node, Target_Type (gnat_node)); | |
9777 | post_error ("\\?use -fno-strict-aliasing switch for references", | |
9778 | gnat_node); | |
9779 | } | |
9780 | } | |
9781 | } | |
9782 | \f | |
a1ab4c31 AC |
9783 | /* EXP is to be treated as an array or record. Handle the cases when it is |
9784 | an access object and perform the required dereferences. */ | |
9785 | ||
9786 | static tree | |
9787 | maybe_implicit_deref (tree exp) | |
9788 | { | |
9789 | /* If the type is a pointer, dereference it. */ | |
315cff15 EB |
9790 | if (POINTER_TYPE_P (TREE_TYPE (exp)) |
9791 | || TYPE_IS_FAT_POINTER_P (TREE_TYPE (exp))) | |
a1ab4c31 AC |
9792 | exp = build_unary_op (INDIRECT_REF, NULL_TREE, exp); |
9793 | ||
9794 | /* If we got a padded type, remove it too. */ | |
315cff15 | 9795 | if (TYPE_IS_PADDING_P (TREE_TYPE (exp))) |
a1ab4c31 AC |
9796 | exp = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (exp))), exp); |
9797 | ||
9798 | return exp; | |
9799 | } | |
9800 | \f | |
a1ab4c31 | 9801 | /* Convert SLOC into LOCUS. Return true if SLOC corresponds to a source code |
ba464315 EB |
9802 | location and false if it doesn't. If CLEAR_COLUMN is true, set the column |
9803 | information to 0. */ | |
a1ab4c31 | 9804 | |
ba464315 EB |
9805 | bool |
9806 | Sloc_to_locus (Source_Ptr Sloc, location_t *locus, bool clear_column) | |
a1ab4c31 AC |
9807 | { |
9808 | if (Sloc == No_Location) | |
9809 | return false; | |
9810 | ||
9811 | if (Sloc <= Standard_Location) | |
9812 | { | |
10069d53 | 9813 | *locus = BUILTINS_LOCATION; |
a1ab4c31 AC |
9814 | return false; |
9815 | } | |
a1ab4c31 | 9816 | |
ba464315 EB |
9817 | Source_File_Index file = Get_Source_File_Index (Sloc); |
9818 | Logical_Line_Number line = Get_Logical_Line_Number (Sloc); | |
9819 | Column_Number column = (clear_column ? 0 : Get_Column_Number (Sloc)); | |
9820 | line_map_ordinary *map = LINEMAPS_ORDINARY_MAP_AT (line_table, file - 1); | |
b7562769 | 9821 | |
ba464315 EB |
9822 | /* We can have zero if pragma Source_Reference is in effect. */ |
9823 | if (line < 1) | |
9824 | line = 1; | |
a1ab4c31 | 9825 | |
ba464315 | 9826 | /* Translate the location. */ |
ebedc9a3 DM |
9827 | *locus = linemap_position_for_line_and_column (line_table, map, |
9828 | line, column); | |
a1ab4c31 AC |
9829 | |
9830 | return true; | |
9831 | } | |
9832 | ||
9833 | /* Similar to set_expr_location, but start with the Sloc of GNAT_NODE and | |
ba464315 EB |
9834 | don't do anything if it doesn't correspond to a source location. And, |
9835 | if CLEAR_COLUMN is true, set the column information to 0. */ | |
a1ab4c31 AC |
9836 | |
9837 | static void | |
ba464315 | 9838 | set_expr_location_from_node (tree node, Node_Id gnat_node, bool clear_column) |
a1ab4c31 AC |
9839 | { |
9840 | location_t locus; | |
9841 | ||
ba464315 | 9842 | if (!Sloc_to_locus (Sloc (gnat_node), &locus, clear_column)) |
a1ab4c31 AC |
9843 | return; |
9844 | ||
9845 | SET_EXPR_LOCATION (node, locus); | |
9846 | } | |
17c168fe EB |
9847 | |
9848 | /* More elaborate version of set_expr_location_from_node to be used in more | |
9849 | general contexts, for example the result of the translation of a generic | |
9850 | GNAT node. */ | |
9851 | ||
9852 | static void | |
9853 | set_gnu_expr_location_from_node (tree node, Node_Id gnat_node) | |
9854 | { | |
9855 | /* Set the location information on the node if it is a real expression. | |
9856 | References can be reused for multiple GNAT nodes and they would get | |
9857 | the location information of their last use. Also make sure not to | |
9858 | overwrite an existing location as it is probably more precise. */ | |
9859 | ||
9860 | switch (TREE_CODE (node)) | |
9861 | { | |
9862 | CASE_CONVERT: | |
9863 | case NON_LVALUE_EXPR: | |
384e3fb1 | 9864 | case SAVE_EXPR: |
17c168fe EB |
9865 | break; |
9866 | ||
9867 | case COMPOUND_EXPR: | |
9868 | if (EXPR_P (TREE_OPERAND (node, 1))) | |
9869 | set_gnu_expr_location_from_node (TREE_OPERAND (node, 1), gnat_node); | |
9870 | ||
9871 | /* ... fall through ... */ | |
9872 | ||
9873 | default: | |
9874 | if (!REFERENCE_CLASS_P (node) && !EXPR_HAS_LOCATION (node)) | |
2a02d090 OH |
9875 | { |
9876 | set_expr_location_from_node (node, gnat_node); | |
9877 | set_end_locus_from_node (node, gnat_node); | |
9878 | } | |
17c168fe EB |
9879 | break; |
9880 | } | |
9881 | } | |
ba464315 EB |
9882 | |
9883 | /* Set the end_locus information for GNU_NODE, if any, from an explicit end | |
9884 | location associated with GNAT_NODE or GNAT_NODE itself, whichever makes | |
9885 | most sense. Return true if a sensible assignment was performed. */ | |
9886 | ||
9887 | static bool | |
9888 | set_end_locus_from_node (tree gnu_node, Node_Id gnat_node) | |
9889 | { | |
9890 | Node_Id gnat_end_label; | |
9891 | location_t end_locus; | |
9892 | ||
9893 | /* Pick the GNAT node of which we'll take the sloc to assign to the GCC node | |
9894 | end_locus when there is one. We consider only GNAT nodes with a possible | |
9895 | End_Label attached. If the End_Label actually was unassigned, fallback | |
9896 | on the original node. We'd better assign an explicit sloc associated with | |
9897 | the outer construct in any case. */ | |
9898 | ||
9899 | switch (Nkind (gnat_node)) | |
9900 | { | |
9901 | case N_Package_Body: | |
9902 | case N_Subprogram_Body: | |
9903 | case N_Block_Statement: | |
9904 | gnat_end_label = End_Label (Handled_Statement_Sequence (gnat_node)); | |
9905 | break; | |
9906 | ||
9907 | case N_Package_Declaration: | |
9908 | gnat_end_label = End_Label (Specification (gnat_node)); | |
9909 | break; | |
9910 | ||
9911 | default: | |
9912 | return false; | |
9913 | } | |
9914 | ||
9915 | if (Present (gnat_end_label)) | |
9916 | gnat_node = gnat_end_label; | |
9917 | ||
9918 | /* Some expanded subprograms have neither an End_Label nor a Sloc | |
9919 | attached. Notify that to callers. For a block statement with no | |
9920 | End_Label, clear column information, so that the tree for a | |
9921 | transient block does not receive the sloc of a source condition. */ | |
9922 | if (!Sloc_to_locus (Sloc (gnat_node), &end_locus, | |
9923 | No (gnat_end_label) | |
9924 | && (Nkind (gnat_node) == N_Block_Statement))) | |
9925 | return false; | |
9926 | ||
9927 | switch (TREE_CODE (gnu_node)) | |
9928 | { | |
9929 | case BIND_EXPR: | |
9930 | BLOCK_SOURCE_END_LOCATION (BIND_EXPR_BLOCK (gnu_node)) = end_locus; | |
9931 | return true; | |
9932 | ||
9933 | case FUNCTION_DECL: | |
9934 | DECL_STRUCT_FUNCTION (gnu_node)->function_end_locus = end_locus; | |
9935 | return true; | |
9936 | ||
9937 | default: | |
9938 | return false; | |
9939 | } | |
9940 | } | |
a1ab4c31 AC |
9941 | \f |
9942 | /* Return a colon-separated list of encodings contained in encoded Ada | |
9943 | name. */ | |
9944 | ||
9945 | static const char * | |
9946 | extract_encoding (const char *name) | |
9947 | { | |
a9429e29 | 9948 | char *encoding = (char *) ggc_alloc_atomic (strlen (name)); |
a1ab4c31 | 9949 | get_encoding (name, encoding); |
a1ab4c31 AC |
9950 | return encoding; |
9951 | } | |
9952 | ||
9953 | /* Extract the Ada name from an encoded name. */ | |
9954 | ||
9955 | static const char * | |
9956 | decode_name (const char *name) | |
9957 | { | |
a9429e29 | 9958 | char *decoded = (char *) ggc_alloc_atomic (strlen (name) * 2 + 60); |
a1ab4c31 | 9959 | __gnat_decode (name, decoded, 0); |
a1ab4c31 AC |
9960 | return decoded; |
9961 | } | |
9962 | \f | |
9963 | /* Post an error message. MSG is the error message, properly annotated. | |
9964 | NODE is the node at which to post the error and the node to use for the | |
586388fd | 9965 | '&' substitution. */ |
a1ab4c31 AC |
9966 | |
9967 | void | |
9968 | post_error (const char *msg, Node_Id node) | |
9969 | { | |
9970 | String_Template temp; | |
93582885 | 9971 | String_Pointer sp; |
a1ab4c31 | 9972 | |
457f72ac EB |
9973 | if (No (node)) |
9974 | return; | |
9975 | ||
9976 | temp.Low_Bound = 1; | |
9977 | temp.High_Bound = strlen (msg); | |
93582885 EB |
9978 | sp.Bounds = &temp; |
9979 | sp.Array = msg; | |
9980 | Error_Msg_N (sp, node); | |
a1ab4c31 AC |
9981 | } |
9982 | ||
586388fd EB |
9983 | /* Similar to post_error, but NODE is the node at which to post the error and |
9984 | ENT is the node to use for the '&' substitution. */ | |
a1ab4c31 AC |
9985 | |
9986 | void | |
9987 | post_error_ne (const char *msg, Node_Id node, Entity_Id ent) | |
9988 | { | |
9989 | String_Template temp; | |
93582885 | 9990 | String_Pointer sp; |
a1ab4c31 | 9991 | |
457f72ac EB |
9992 | if (No (node)) |
9993 | return; | |
9994 | ||
9995 | temp.Low_Bound = 1; | |
9996 | temp.High_Bound = strlen (msg); | |
93582885 EB |
9997 | sp.Bounds = &temp; |
9998 | sp.Array = msg; | |
9999 | Error_Msg_NE (sp, node, ent); | |
a1ab4c31 AC |
10000 | } |
10001 | ||
586388fd | 10002 | /* Similar to post_error_ne, but NUM is the number to use for the '^'. */ |
a1ab4c31 AC |
10003 | |
10004 | void | |
58c8f770 | 10005 | post_error_ne_num (const char *msg, Node_Id node, Entity_Id ent, int num) |
a1ab4c31 | 10006 | { |
58c8f770 | 10007 | Error_Msg_Uint_1 = UI_From_Int (num); |
586388fd | 10008 | post_error_ne (msg, node, ent); |
a1ab4c31 | 10009 | } |
2a02d090 | 10010 | |
586388fd EB |
10011 | /* Similar to post_error_ne, but T is a GCC tree representing the number to |
10012 | write. If T represents a constant, the text inside curly brackets in | |
10013 | MSG will be output (presumably including a '^'). Otherwise it will not | |
10014 | be output and the text inside square brackets will be output instead. */ | |
a1ab4c31 AC |
10015 | |
10016 | void | |
10017 | post_error_ne_tree (const char *msg, Node_Id node, Entity_Id ent, tree t) | |
10018 | { | |
586388fd | 10019 | char *new_msg = XALLOCAVEC (char, strlen (msg) + 1); |
a1ab4c31 AC |
10020 | char start_yes, end_yes, start_no, end_no; |
10021 | const char *p; | |
10022 | char *q; | |
10023 | ||
586388fd | 10024 | if (TREE_CODE (t) == INTEGER_CST) |
a1ab4c31 | 10025 | { |
586388fd | 10026 | Error_Msg_Uint_1 = UI_From_gnu (t); |
a1ab4c31 AC |
10027 | start_yes = '{', end_yes = '}', start_no = '[', end_no = ']'; |
10028 | } | |
10029 | else | |
10030 | start_yes = '[', end_yes = ']', start_no = '{', end_no = '}'; | |
10031 | ||
586388fd | 10032 | for (p = msg, q = new_msg; *p; p++) |
a1ab4c31 AC |
10033 | { |
10034 | if (*p == start_yes) | |
10035 | for (p++; *p != end_yes; p++) | |
10036 | *q++ = *p; | |
10037 | else if (*p == start_no) | |
10038 | for (p++; *p != end_no; p++) | |
10039 | ; | |
10040 | else | |
10041 | *q++ = *p; | |
10042 | } | |
10043 | ||
10044 | *q = 0; | |
10045 | ||
586388fd | 10046 | post_error_ne (new_msg, node, ent); |
a1ab4c31 AC |
10047 | } |
10048 | ||
586388fd | 10049 | /* Similar to post_error_ne_tree, but NUM is a second integer to write. */ |
a1ab4c31 AC |
10050 | |
10051 | void | |
1e17ef87 EB |
10052 | post_error_ne_tree_2 (const char *msg, Node_Id node, Entity_Id ent, tree t, |
10053 | int num) | |
a1ab4c31 AC |
10054 | { |
10055 | Error_Msg_Uint_2 = UI_From_Int (num); | |
10056 | post_error_ne_tree (msg, node, ent, t); | |
10057 | } | |
7c775aca EB |
10058 | |
10059 | /* Return a label to branch to for the exception type in KIND or NULL_TREE | |
10060 | if none. */ | |
10061 | ||
10062 | tree | |
10063 | get_exception_label (char kind) | |
10064 | { | |
10065 | switch (kind) | |
10066 | { | |
10067 | case N_Raise_Constraint_Error: | |
10068 | return gnu_constraint_error_label_stack->last (); | |
10069 | ||
10070 | case N_Raise_Storage_Error: | |
10071 | return gnu_storage_error_label_stack->last (); | |
10072 | ||
10073 | case N_Raise_Program_Error: | |
10074 | return gnu_program_error_label_stack->last (); | |
10075 | ||
10076 | default: | |
10077 | break; | |
10078 | } | |
10079 | ||
10080 | return NULL_TREE; | |
10081 | } | |
10082 | ||
10083 | /* Return the decl for the current elaboration procedure. */ | |
10084 | ||
10085 | tree | |
10086 | get_elaboration_procedure (void) | |
10087 | { | |
10088 | return gnu_elab_proc_stack->last (); | |
10089 | } | |
10090 | ||
a1ab4c31 AC |
10091 | /* Initialize the table that maps GNAT codes to GCC codes for simple |
10092 | binary and unary operations. */ | |
10093 | ||
10094 | static void | |
10095 | init_code_table (void) | |
10096 | { | |
a1ab4c31 AC |
10097 | gnu_codes[N_Op_And] = TRUTH_AND_EXPR; |
10098 | gnu_codes[N_Op_Or] = TRUTH_OR_EXPR; | |
10099 | gnu_codes[N_Op_Xor] = TRUTH_XOR_EXPR; | |
10100 | gnu_codes[N_Op_Eq] = EQ_EXPR; | |
10101 | gnu_codes[N_Op_Ne] = NE_EXPR; | |
10102 | gnu_codes[N_Op_Lt] = LT_EXPR; | |
10103 | gnu_codes[N_Op_Le] = LE_EXPR; | |
10104 | gnu_codes[N_Op_Gt] = GT_EXPR; | |
10105 | gnu_codes[N_Op_Ge] = GE_EXPR; | |
10106 | gnu_codes[N_Op_Add] = PLUS_EXPR; | |
10107 | gnu_codes[N_Op_Subtract] = MINUS_EXPR; | |
10108 | gnu_codes[N_Op_Multiply] = MULT_EXPR; | |
10109 | gnu_codes[N_Op_Mod] = FLOOR_MOD_EXPR; | |
10110 | gnu_codes[N_Op_Rem] = TRUNC_MOD_EXPR; | |
10111 | gnu_codes[N_Op_Minus] = NEGATE_EXPR; | |
10112 | gnu_codes[N_Op_Abs] = ABS_EXPR; | |
10113 | gnu_codes[N_Op_Not] = TRUTH_NOT_EXPR; | |
10114 | gnu_codes[N_Op_Rotate_Left] = LROTATE_EXPR; | |
10115 | gnu_codes[N_Op_Rotate_Right] = RROTATE_EXPR; | |
10116 | gnu_codes[N_Op_Shift_Left] = LSHIFT_EXPR; | |
10117 | gnu_codes[N_Op_Shift_Right] = RSHIFT_EXPR; | |
10118 | gnu_codes[N_Op_Shift_Right_Arithmetic] = RSHIFT_EXPR; | |
9a1bdc31 EB |
10119 | gnu_codes[N_And_Then] = TRUTH_ANDIF_EXPR; |
10120 | gnu_codes[N_Or_Else] = TRUTH_ORIF_EXPR; | |
a1ab4c31 AC |
10121 | } |
10122 | ||
a1ab4c31 | 10123 | #include "gt-ada-trans.h" |