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51e29401 | 1 | /* Process declarations and variables for C compiler. |
21c7361e | 2 | Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
e4a95933 | 3 | 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
1ea193c2 | 4 | Free Software Foundation, Inc. |
51e29401 | 5 | |
1322177d | 6 | This file is part of GCC. |
51e29401 | 7 | |
1322177d LB |
8 | GCC is free software; you can redistribute it and/or modify it under |
9 | the terms of the GNU General Public License as published by the Free | |
9dcd6f09 | 10 | Software Foundation; either version 3, or (at your option) any later |
1322177d | 11 | version. |
51e29401 | 12 | |
1322177d LB |
13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
51e29401 RS |
17 | |
18 | You should have received a copy of the GNU General Public License | |
9dcd6f09 NC |
19 | along with GCC; see the file COPYING3. If not see |
20 | <http://www.gnu.org/licenses/>. */ | |
51e29401 | 21 | |
51e29401 RS |
22 | /* Process declarations and symbol lookup for C front end. |
23 | Also constructs types; the standard scalar types at initialization, | |
24 | and structure, union, array and enum types when they are declared. */ | |
25 | ||
26 | /* ??? not all decl nodes are given the most useful possible | |
27 | line numbers. For example, the CONST_DECLs for enum values. */ | |
28 | ||
29 | #include "config.h" | |
670ee920 | 30 | #include "system.h" |
4977bab6 | 31 | #include "coretypes.h" |
43e05e45 | 32 | #include "input.h" |
4977bab6 | 33 | #include "tm.h" |
993c790e | 34 | #include "intl.h" |
51e29401 | 35 | #include "tree.h" |
4838c5ee | 36 | #include "tree-inline.h" |
51e29401 | 37 | #include "flags.h" |
49ad7cfa | 38 | #include "function.h" |
e14417fa | 39 | #include "output.h" |
51e29401 | 40 | #include "c-tree.h" |
5f6da302 | 41 | #include "toplev.h" |
809d4ef1 | 42 | #include "tm_p.h" |
a0d85b75 | 43 | #include "cpplib.h" |
672a6f42 | 44 | #include "target.h" |
e1772ac0 | 45 | #include "debug.h" |
40e941af | 46 | #include "opts.h" |
b932f770 | 47 | #include "timevar.h" |
39dabefd SB |
48 | #include "c-family/c-common.h" |
49 | #include "c-family/c-pragma.h" | |
29cc57cf | 50 | #include "c-lang.h" |
6de9cd9a DN |
51 | #include "langhooks.h" |
52 | #include "tree-mudflap.h" | |
726a989a | 53 | #include "tree-iterator.h" |
1da2ed5f | 54 | #include "diagnostic-core.h" |
6de9cd9a | 55 | #include "tree-dump.h" |
1c4a429a | 56 | #include "cgraph.h" |
66ea6f4c | 57 | #include "hashtab.h" |
48873ed2 | 58 | #include "langhooks-def.h" |
820cc88f | 59 | #include "pointer-set.h" |
68a607d8 | 60 | #include "plugin.h" |
39dabefd | 61 | #include "c-family/c-ada-spec.h" |
a0d85b75 | 62 | |
51e29401 RS |
63 | /* In grokdeclarator, distinguish syntactic contexts of declarators. */ |
64 | enum decl_context | |
65 | { NORMAL, /* Ordinary declaration */ | |
66 | FUNCDEF, /* Function definition */ | |
67 | PARM, /* Declaration of parm before function body */ | |
68 | FIELD, /* Declaration inside struct or union */ | |
51e29401 RS |
69 | TYPENAME}; /* Typename (inside cast or sizeof) */ |
70 | ||
0da300cd TT |
71 | /* States indicating how grokdeclarator() should handle declspecs marked |
72 | with __attribute__((deprecated)). An object declared as | |
73 | __attribute__((deprecated)) suppresses warnings of uses of other | |
74 | deprecated items. */ | |
75 | ||
76 | enum deprecated_states { | |
77 | DEPRECATED_NORMAL, | |
78 | DEPRECATED_SUPPRESS | |
79 | }; | |
80 | ||
51e29401 | 81 | \f |
51e29401 RS |
82 | /* Nonzero if we have seen an invalid cross reference |
83 | to a struct, union, or enum, but not yet printed the message. */ | |
51e29401 | 84 | tree pending_invalid_xref; |
093c7153 | 85 | |
51e29401 | 86 | /* File and line to appear in the eventual error message. */ |
070588f0 | 87 | location_t pending_invalid_xref_location; |
51e29401 | 88 | |
77dbdb57 ZW |
89 | /* The file and line that the prototype came from if this is an |
90 | old-style definition; used for diagnostics in | |
91 | store_parm_decls_oldstyle. */ | |
eb1dfbb2 | 92 | |
95035b6f | 93 | static location_t current_function_prototype_locus; |
50a9145c | 94 | |
6fb58bba JM |
95 | /* Whether this prototype was built-in. */ |
96 | ||
97 | static bool current_function_prototype_built_in; | |
98 | ||
99 | /* The argument type information of this prototype. */ | |
100 | ||
101 | static tree current_function_prototype_arg_types; | |
102 | ||
7b112487 JM |
103 | /* The argument information structure for the function currently being |
104 | defined. */ | |
105 | ||
f8893e47 | 106 | static struct c_arg_info *current_function_arg_info; |
7b112487 | 107 | |
bc4b653b JM |
108 | /* The obstack on which parser and related data structures, which are |
109 | not live beyond their top-level declaration or definition, are | |
110 | allocated. */ | |
111 | struct obstack parser_obstack; | |
112 | ||
8f17b5c5 MM |
113 | /* The current statement tree. */ |
114 | ||
e2500fed | 115 | static GTY(()) struct stmt_tree_s c_stmt_tree; |
8f17b5c5 | 116 | |
6614fd40 | 117 | /* State saving variables. */ |
506e2710 RH |
118 | tree c_break_label; |
119 | tree c_cont_label; | |
e13e48e7 | 120 | |
eecec698 ZW |
121 | /* Linked list of TRANSLATION_UNIT_DECLS for the translation units |
122 | included in this invocation. Note that the current translation | |
123 | unit is not included in this list. */ | |
d1bd0ded | 124 | |
eecec698 | 125 | static GTY(()) tree all_translation_units; |
d1bd0ded | 126 | |
f75fbaf7 ZW |
127 | /* A list of decls to be made automatically visible in each file scope. */ |
128 | static GTY(()) tree visible_builtins; | |
129 | ||
51e29401 RS |
130 | /* Set to 0 at beginning of a function definition, set to 1 if |
131 | a return statement that specifies a return value is seen. */ | |
132 | ||
133 | int current_function_returns_value; | |
134 | ||
135 | /* Set to 0 at beginning of a function definition, set to 1 if | |
136 | a return statement with no argument is seen. */ | |
137 | ||
138 | int current_function_returns_null; | |
139 | ||
5ce89b2e JM |
140 | /* Set to 0 at beginning of a function definition, set to 1 if |
141 | a call to a noreturn function is seen. */ | |
142 | ||
143 | int current_function_returns_abnormally; | |
144 | ||
51e29401 RS |
145 | /* Set to nonzero by `grokdeclarator' for a function |
146 | whose return type is defaulted, if warnings for this are desired. */ | |
147 | ||
148 | static int warn_about_return_type; | |
149 | ||
73aea290 JM |
150 | /* Nonzero when the current toplevel function contains a declaration |
151 | of a nested function which is never defined. */ | |
152 | ||
153 | static bool undef_nested_function; | |
154 | ||
f75fbaf7 ZW |
155 | /* True means global_bindings_p should return false even if the scope stack |
156 | says we are in file scope. */ | |
157 | bool c_override_global_bindings_to_false; | |
158 | ||
51e29401 | 159 | \f |
f75fbaf7 ZW |
160 | /* Each c_binding structure describes one binding of an identifier to |
161 | a decl. All the decls in a scope - irrespective of namespace - are | |
162 | chained together by the ->prev field, which (as the name implies) | |
163 | runs in reverse order. All the decls in a given namespace bound to | |
164 | a given identifier are chained by the ->shadowed field, which runs | |
9aaabf8a | 165 | from inner to outer scopes. |
f75fbaf7 ZW |
166 | |
167 | The ->decl field usually points to a DECL node, but there are two | |
168 | exceptions. In the namespace of type tags, the bound entity is a | |
169 | RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared | |
170 | identifier is encountered, it is bound to error_mark_node to | |
171 | suppress further errors about that identifier in the current | |
9aaabf8a ZW |
172 | function. |
173 | ||
e1b7793c | 174 | The ->u.type field stores the type of the declaration in this scope; |
0b410f0b JM |
175 | if NULL, the type is the type of the ->decl field. This is only of |
176 | relevance for objects with external or internal linkage which may | |
177 | be redeclared in inner scopes, forming composite types that only | |
178 | persist for the duration of those scopes. In the external scope, | |
179 | this stores the composite of all the types declared for this | |
180 | object, visible or not. The ->inner_comp field (used only at file | |
181 | scope) stores whether an incomplete array type at file scope was | |
182 | completed at an inner scope to an array size other than 1. | |
183 | ||
e1b7793c ILT |
184 | The ->u.label field is used for labels. It points to a structure |
185 | which stores additional information used for warnings. | |
186 | ||
9aaabf8a ZW |
187 | The depth field is copied from the scope structure that holds this |
188 | decl. It is used to preserve the proper ordering of the ->shadowed | |
189 | field (see bind()) and also for a handful of special-case checks. | |
190 | Finally, the invisible bit is true for a decl which should be | |
191 | ignored for purposes of normal name lookup, and the nested bit is | |
192 | true for a decl that's been bound a second time in an inner scope; | |
193 | in all such cases, the binding in the outer scope will have its | |
194 | invisible bit true. */ | |
f75fbaf7 | 195 | |
d1b38208 | 196 | struct GTY((chain_next ("%h.prev"))) c_binding { |
e1b7793c ILT |
197 | union GTY(()) { /* first so GTY desc can use decl */ |
198 | tree GTY((tag ("0"))) type; /* the type in this scope */ | |
199 | struct c_label_vars * GTY((tag ("1"))) label; /* for warnings */ | |
200 | } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u; | |
f75fbaf7 ZW |
201 | tree decl; /* the decl bound */ |
202 | tree id; /* the identifier it's bound to */ | |
203 | struct c_binding *prev; /* the previous decl in this scope */ | |
204 | struct c_binding *shadowed; /* the innermost decl shadowed by this one */ | |
9aaabf8a ZW |
205 | unsigned int depth : 28; /* depth of this scope */ |
206 | BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */ | |
207 | BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */ | |
0b410f0b | 208 | BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */ |
dc491a25 | 209 | BOOL_BITFIELD in_struct : 1; /* currently defined as struct field */ |
b3f27c15 | 210 | location_t locus; /* location for nested bindings */ |
f75fbaf7 | 211 | }; |
9aaabf8a ZW |
212 | #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth) |
213 | #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth) | |
214 | #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/) | |
215 | #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/) | |
f75fbaf7 ZW |
216 | |
217 | #define I_SYMBOL_BINDING(node) \ | |
3f75a254 | 218 | (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding) |
f75fbaf7 ZW |
219 | #define I_SYMBOL_DECL(node) \ |
220 | (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0) | |
221 | ||
222 | #define I_TAG_BINDING(node) \ | |
3f75a254 | 223 | (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding) |
f75fbaf7 ZW |
224 | #define I_TAG_DECL(node) \ |
225 | (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0) | |
226 | ||
227 | #define I_LABEL_BINDING(node) \ | |
3f75a254 | 228 | (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding) |
f75fbaf7 ZW |
229 | #define I_LABEL_DECL(node) \ |
230 | (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0) | |
231 | ||
18d5f982 ZW |
232 | /* Each C symbol points to three linked lists of c_binding structures. |
233 | These describe the values of the identifier in the three different | |
234 | namespaces defined by the language. */ | |
235 | ||
d1b38208 | 236 | struct GTY(()) lang_identifier { |
18d5f982 ZW |
237 | struct c_common_identifier common_id; |
238 | struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */ | |
239 | struct c_binding *tag_binding; /* struct/union/enum tags */ | |
240 | struct c_binding *label_binding; /* labels */ | |
241 | }; | |
242 | ||
243 | /* Validate c-lang.c's assumptions. */ | |
244 | extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate | |
245 | [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1]; | |
246 | ||
247 | /* The resulting tree type. */ | |
248 | ||
d1b38208 TG |
249 | union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"), |
250 | chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : ((union lang_tree_node *) TREE_CHAIN (&%h.generic))"))) lang_tree_node | |
251 | { | |
18d5f982 ZW |
252 | union tree_node GTY ((tag ("0"), |
253 | desc ("tree_node_structure (&%h)"))) | |
254 | generic; | |
255 | struct lang_identifier GTY ((tag ("1"))) identifier; | |
256 | }; | |
257 | ||
e1b7793c ILT |
258 | /* Track bindings and other things that matter for goto warnings. For |
259 | efficiency, we do not gather all the decls at the point of | |
260 | definition. Instead, we point into the bindings structure. As | |
261 | scopes are popped, we update these structures and gather the decls | |
262 | that matter at that time. */ | |
263 | ||
264 | struct GTY(()) c_spot_bindings { | |
265 | /* The currently open scope which holds bindings defined when the | |
266 | label was defined or the goto statement was found. */ | |
267 | struct c_scope *scope; | |
268 | /* The bindings in the scope field which were defined at the point | |
269 | of the label or goto. This lets us look at older or newer | |
270 | bindings in the scope, as appropriate. */ | |
271 | struct c_binding *bindings_in_scope; | |
272 | /* The number of statement expressions that have started since this | |
273 | label or goto statement was defined. This is zero if we are at | |
274 | the same statement expression level. It is positive if we are in | |
275 | a statement expression started since this spot. It is negative | |
276 | if this spot was in a statement expression and we have left | |
277 | it. */ | |
278 | int stmt_exprs; | |
279 | /* Whether we started in a statement expression but are no longer in | |
280 | it. This is set to true if stmt_exprs ever goes negative. */ | |
281 | bool left_stmt_expr; | |
282 | }; | |
283 | ||
284 | /* This structure is used to keep track of bindings seen when a goto | |
285 | statement is defined. This is only used if we see the goto | |
286 | statement before we see the label. */ | |
287 | ||
288 | struct GTY(()) c_goto_bindings { | |
289 | /* The location of the goto statement. */ | |
290 | location_t loc; | |
291 | /* The bindings of the goto statement. */ | |
292 | struct c_spot_bindings goto_bindings; | |
293 | }; | |
294 | ||
295 | typedef struct c_goto_bindings *c_goto_bindings_p; | |
296 | DEF_VEC_P(c_goto_bindings_p); | |
297 | DEF_VEC_ALLOC_P(c_goto_bindings_p,gc); | |
298 | ||
299 | /* The additional information we keep track of for a label binding. | |
300 | These fields are updated as scopes are popped. */ | |
301 | ||
302 | struct GTY(()) c_label_vars { | |
303 | /* The shadowed c_label_vars, when one label shadows another (which | |
304 | can only happen using a __label__ declaration). */ | |
305 | struct c_label_vars *shadowed; | |
306 | /* The bindings when the label was defined. */ | |
307 | struct c_spot_bindings label_bindings; | |
308 | /* A list of decls that we care about: decls about which we should | |
309 | warn if a goto branches to this label from later in the function. | |
310 | Decls are added to this list as scopes are popped. We only add | |
311 | the decls that matter. */ | |
312 | VEC(tree,gc) *decls_in_scope; | |
313 | /* A list of goto statements to this label. This is only used for | |
314 | goto statements seen before the label was defined, so that we can | |
315 | issue appropriate warnings for them. */ | |
316 | VEC(c_goto_bindings_p,gc) *gotos; | |
317 | }; | |
318 | ||
f75fbaf7 ZW |
319 | /* Each c_scope structure describes the complete contents of one |
320 | scope. Four scopes are distinguished specially: the innermost or | |
321 | current scope, the innermost function scope, the file scope (always | |
322 | the second to outermost) and the outermost or external scope. | |
f91f41b2 ZW |
323 | |
324 | Most declarations are recorded in the current scope. | |
325 | ||
326 | All normal label declarations are recorded in the innermost | |
327 | function scope, as are bindings of undeclared identifiers to | |
328 | error_mark_node. (GCC permits nested functions as an extension, | |
329 | hence the 'innermost' qualifier.) Explicitly declared labels | |
330 | (using the __label__ extension) appear in the current scope. | |
331 | ||
f75fbaf7 | 332 | Being in the file scope (current_scope == file_scope) causes |
f91f41b2 ZW |
333 | special behavior in several places below. Also, under some |
334 | conditions the Objective-C front end records declarations in the | |
f75fbaf7 ZW |
335 | file scope even though that isn't the current scope. |
336 | ||
337 | All declarations with external linkage are recorded in the external | |
338 | scope, even if they aren't visible there; this models the fact that | |
339 | such declarations are visible to the entire program, and (with a | |
340 | bit of cleverness, see pushdecl) allows diagnosis of some violations | |
341 | of C99 6.2.2p7 and 6.2.7p2: | |
342 | ||
343 | If, within the same translation unit, the same identifier appears | |
344 | with both internal and external linkage, the behavior is | |
345 | undefined. | |
f91f41b2 | 346 | |
f75fbaf7 ZW |
347 | All declarations that refer to the same object or function shall |
348 | have compatible type; otherwise, the behavior is undefined. | |
349 | ||
350 | Initially only the built-in declarations, which describe compiler | |
351 | intrinsic functions plus a subset of the standard library, are in | |
352 | this scope. | |
353 | ||
354 | The order of the blocks list matters, and it is frequently appended | |
355 | to. To avoid having to walk all the way to the end of the list on | |
356 | each insertion, or reverse the list later, we maintain a pointer to | |
357 | the last list entry. (FIXME: It should be feasible to use a reversed | |
358 | list here.) | |
359 | ||
360 | The bindings list is strictly in reverse order of declarations; | |
361 | pop_scope relies on this. */ | |
f91f41b2 | 362 | |
51e29401 | 363 | |
d1b38208 | 364 | struct GTY((chain_next ("%h.outer"))) c_scope { |
14077d68 ZW |
365 | /* The scope containing this one. */ |
366 | struct c_scope *outer; | |
367 | ||
368 | /* The next outermost function scope. */ | |
369 | struct c_scope *outer_function; | |
370 | ||
f75fbaf7 ZW |
371 | /* All bindings in this scope. */ |
372 | struct c_binding *bindings; | |
14077d68 ZW |
373 | |
374 | /* For each scope (except the global one), a chain of BLOCK nodes | |
375 | for all the scopes that were entered and exited one level down. */ | |
376 | tree blocks; | |
f91f41b2 | 377 | tree blocks_last; |
14077d68 | 378 | |
f75fbaf7 ZW |
379 | /* The depth of this scope. Used to keep the ->shadowed chain of |
380 | bindings sorted innermost to outermost. */ | |
381 | unsigned int depth : 28; | |
382 | ||
14077d68 ZW |
383 | /* True if we are currently filling this scope with parameter |
384 | declarations. */ | |
1c62e7b2 | 385 | BOOL_BITFIELD parm_flag : 1; |
14077d68 | 386 | |
52ffd86e MS |
387 | /* True if we saw [*] in this scope. Used to give an error messages |
388 | if these appears in a function definition. */ | |
389 | BOOL_BITFIELD had_vla_unspec : 1; | |
390 | ||
55d54003 ZW |
391 | /* True if we already complained about forward parameter decls |
392 | in this scope. This prevents double warnings on | |
393 | foo (int a; int b; ...) */ | |
1c62e7b2 | 394 | BOOL_BITFIELD warned_forward_parm_decls : 1; |
55d54003 | 395 | |
14077d68 ZW |
396 | /* True if this is the outermost block scope of a function body. |
397 | This scope contains the parameters, the local variables declared | |
398 | in the outermost block, and all the labels (except those in | |
399 | nested functions, or declared at block scope with __label__). */ | |
1c62e7b2 | 400 | BOOL_BITFIELD function_body : 1; |
14077d68 ZW |
401 | |
402 | /* True means make a BLOCK for this scope no matter what. */ | |
1c62e7b2 | 403 | BOOL_BITFIELD keep : 1; |
6ec637a4 JJ |
404 | |
405 | /* True means that an unsuffixed float constant is _Decimal64. */ | |
406 | BOOL_BITFIELD float_const_decimal64 : 1; | |
e1b7793c ILT |
407 | |
408 | /* True if this scope has any label bindings. This is used to speed | |
409 | up searching for labels when popping scopes, particularly since | |
410 | labels are normally only found at function scope. */ | |
411 | BOOL_BITFIELD has_label_bindings : 1; | |
14077d68 | 412 | }; |
51e29401 | 413 | |
f8521984 | 414 | /* The scope currently in effect. */ |
6645c3fa | 415 | |
f8521984 | 416 | static GTY(()) struct c_scope *current_scope; |
51e29401 | 417 | |
14e33ee8 ZW |
418 | /* The innermost function scope. Ordinary (not explicitly declared) |
419 | labels, bindings to error_mark_node, and the lazily-created | |
420 | bindings of __func__ and its friends get this scope. */ | |
14077d68 | 421 | |
f8521984 | 422 | static GTY(()) struct c_scope *current_function_scope; |
14e33ee8 | 423 | |
f75fbaf7 ZW |
424 | /* The C file scope. This is reset for each input translation unit. */ |
425 | ||
426 | static GTY(()) struct c_scope *file_scope; | |
427 | ||
428 | /* The outermost scope. This is used for all declarations with | |
429 | external linkage, and only these, hence the name. */ | |
430 | ||
431 | static GTY(()) struct c_scope *external_scope; | |
432 | ||
433 | /* A chain of c_scope structures awaiting reuse. */ | |
434 | ||
1431042e | 435 | static GTY((deletable)) struct c_scope *scope_freelist; |
f75fbaf7 ZW |
436 | |
437 | /* A chain of c_binding structures awaiting reuse. */ | |
51e29401 | 438 | |
1431042e | 439 | static GTY((deletable)) struct c_binding *binding_freelist; |
51e29401 | 440 | |
3d93cdfa | 441 | /* Append VAR to LIST in scope SCOPE. */ |
f91f41b2 ZW |
442 | #define SCOPE_LIST_APPEND(scope, list, decl) do { \ |
443 | struct c_scope *s_ = (scope); \ | |
444 | tree d_ = (decl); \ | |
445 | if (s_->list##_last) \ | |
87caf699 | 446 | BLOCK_CHAIN (s_->list##_last) = d_; \ |
f91f41b2 ZW |
447 | else \ |
448 | s_->list = d_; \ | |
449 | s_->list##_last = d_; \ | |
450 | } while (0) | |
451 | ||
452 | /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */ | |
453 | #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \ | |
454 | struct c_scope *t_ = (tscope); \ | |
455 | struct c_scope *f_ = (fscope); \ | |
456 | if (t_->to##_last) \ | |
87caf699 | 457 | BLOCK_CHAIN (t_->to##_last) = f_->from; \ |
f91f41b2 ZW |
458 | else \ |
459 | t_->to = f_->from; \ | |
460 | t_->to##_last = f_->from##_last; \ | |
461 | } while (0) | |
462 | ||
991d6621 JM |
463 | /* A c_inline_static structure stores details of a static identifier |
464 | referenced in a definition of a function that may be an inline | |
465 | definition if no subsequent declaration of that function uses | |
466 | "extern" or does not use "inline". */ | |
467 | ||
468 | struct GTY((chain_next ("%h.next"))) c_inline_static { | |
469 | /* The location for a diagnostic. */ | |
470 | location_t location; | |
471 | ||
472 | /* The function that may be an inline definition. */ | |
473 | tree function; | |
474 | ||
475 | /* The object or function referenced. */ | |
476 | tree static_decl; | |
477 | ||
478 | /* What sort of reference this is. */ | |
479 | enum c_inline_static_type type; | |
480 | ||
481 | /* The next such structure or NULL. */ | |
482 | struct c_inline_static *next; | |
483 | }; | |
484 | ||
485 | /* List of static identifiers used or referenced in functions that may | |
486 | be inline definitions. */ | |
487 | static GTY(()) struct c_inline_static *c_inline_statics; | |
488 | ||
f8521984 | 489 | /* True means unconditionally make a BLOCK for the next scope pushed. */ |
51e29401 | 490 | |
14e33ee8 | 491 | static bool keep_next_level_flag; |
51e29401 | 492 | |
f75fbaf7 | 493 | /* True means the next call to push_scope will be the outermost scope |
a8ccdffe ZW |
494 | of a function body, so do not push a new scope, merely cease |
495 | expecting parameter decls. */ | |
6645c3fa | 496 | |
a8ccdffe | 497 | static bool next_is_function_body; |
51e29401 | 498 | |
dc491a25 ILT |
499 | /* A VEC of pointers to c_binding structures. */ |
500 | ||
501 | typedef struct c_binding *c_binding_ptr; | |
502 | DEF_VEC_P(c_binding_ptr); | |
503 | DEF_VEC_ALLOC_P(c_binding_ptr,heap); | |
504 | ||
505 | /* Information that we keep for a struct or union while it is being | |
506 | parsed. */ | |
507 | ||
508 | struct c_struct_parse_info | |
509 | { | |
510 | /* If warn_cxx_compat, a list of types defined within this | |
511 | struct. */ | |
512 | VEC(tree,heap) *struct_types; | |
513 | /* If warn_cxx_compat, a list of field names which have bindings, | |
514 | and which are defined in this struct, but which are not defined | |
515 | in any enclosing struct. This is used to clear the in_struct | |
516 | field of the c_bindings structure. */ | |
517 | VEC(c_binding_ptr,heap) *fields; | |
518 | /* If warn_cxx_compat, a list of typedef names used when defining | |
519 | fields in this struct. */ | |
520 | VEC(tree,heap) *typedefs_seen; | |
521 | }; | |
522 | ||
523 | /* Information for the struct or union currently being parsed, or | |
524 | NULL if not parsing a struct or union. */ | |
525 | static struct c_struct_parse_info *struct_parse_info; | |
526 | ||
51e29401 | 527 | /* Forward declarations. */ |
f75fbaf7 | 528 | static tree lookup_name_in_scope (tree, struct c_scope *); |
c2255bc4 | 529 | static tree c_make_fname_decl (location_t, tree, int); |
deb176fa JM |
530 | static tree grokdeclarator (const struct c_declarator *, |
531 | struct c_declspecs *, | |
928c19bb JM |
532 | enum decl_context, bool, tree *, tree *, tree *, |
533 | bool *, enum deprecated_states); | |
f8893e47 | 534 | static tree grokparms (struct c_arg_info *, bool); |
35b1a6fa | 535 | static void layout_array_type (tree); |
51e29401 | 536 | \f |
ed3d0b14 ILT |
537 | /* T is a statement. Add it to the statement-tree. This is the |
538 | C/ObjC version--C++ has a slightly different version of this | |
539 | function. */ | |
540 | ||
541 | tree | |
542 | add_stmt (tree t) | |
543 | { | |
544 | enum tree_code code = TREE_CODE (t); | |
545 | ||
07beea0d | 546 | if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR) |
ed3d0b14 ILT |
547 | { |
548 | if (!EXPR_HAS_LOCATION (t)) | |
549 | SET_EXPR_LOCATION (t, input_location); | |
550 | } | |
551 | ||
552 | if (code == LABEL_EXPR || code == CASE_LABEL_EXPR) | |
553 | STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1; | |
554 | ||
555 | /* Add T to the statement-tree. Non-side-effect statements need to be | |
556 | recorded during statement expressions. */ | |
557 | append_to_statement_list_force (t, &cur_stmt_list); | |
558 | ||
559 | return t; | |
560 | } | |
561 | \f | |
e23bd218 | 562 | |
51e29401 | 563 | void |
35b1a6fa | 564 | c_print_identifier (FILE *file, tree node, int indent) |
51e29401 | 565 | { |
f75fbaf7 ZW |
566 | print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4); |
567 | print_node (file, "tag", I_TAG_DECL (node), indent + 4); | |
568 | print_node (file, "label", I_LABEL_DECL (node), indent + 4); | |
eea1139b | 569 | if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN) |
0e5921e8 ZW |
570 | { |
571 | tree rid = ridpointers[C_RID_CODE (node)]; | |
572 | indent_to (file, indent + 4); | |
edb89024 | 573 | fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"", |
75b6f3fd | 574 | (void *) rid, IDENTIFIER_POINTER (rid)); |
0e5921e8 | 575 | } |
51e29401 | 576 | } |
f75fbaf7 ZW |
577 | |
578 | /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL, | |
579 | which may be any of several kinds of DECL or TYPE or error_mark_node, | |
580 | in the scope SCOPE. */ | |
581 | static void | |
b3f27c15 JJ |
582 | bind (tree name, tree decl, struct c_scope *scope, bool invisible, |
583 | bool nested, location_t locus) | |
f75fbaf7 ZW |
584 | { |
585 | struct c_binding *b, **here; | |
586 | ||
587 | if (binding_freelist) | |
588 | { | |
589 | b = binding_freelist; | |
590 | binding_freelist = b->prev; | |
591 | } | |
592 | else | |
a9429e29 | 593 | b = ggc_alloc_c_binding (); |
f75fbaf7 ZW |
594 | |
595 | b->shadowed = 0; | |
596 | b->decl = decl; | |
597 | b->id = name; | |
9aaabf8a ZW |
598 | b->depth = scope->depth; |
599 | b->invisible = invisible; | |
600 | b->nested = nested; | |
0b410f0b | 601 | b->inner_comp = 0; |
dc491a25 | 602 | b->in_struct = 0; |
b3f27c15 | 603 | b->locus = locus; |
0b410f0b | 604 | |
e1b7793c | 605 | b->u.type = NULL; |
f75fbaf7 ZW |
606 | |
607 | b->prev = scope->bindings; | |
608 | scope->bindings = b; | |
609 | ||
610 | if (!name) | |
611 | return; | |
612 | ||
613 | switch (TREE_CODE (decl)) | |
614 | { | |
615 | case LABEL_DECL: here = &I_LABEL_BINDING (name); break; | |
616 | case ENUMERAL_TYPE: | |
617 | case UNION_TYPE: | |
618 | case RECORD_TYPE: here = &I_TAG_BINDING (name); break; | |
619 | case VAR_DECL: | |
620 | case FUNCTION_DECL: | |
621 | case TYPE_DECL: | |
622 | case CONST_DECL: | |
623 | case PARM_DECL: | |
624 | case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break; | |
625 | ||
626 | default: | |
366de0ce | 627 | gcc_unreachable (); |
f75fbaf7 ZW |
628 | } |
629 | ||
630 | /* Locate the appropriate place in the chain of shadowed decls | |
631 | to insert this binding. Normally, scope == current_scope and | |
632 | this does nothing. */ | |
9aaabf8a | 633 | while (*here && (*here)->depth > scope->depth) |
f75fbaf7 ZW |
634 | here = &(*here)->shadowed; |
635 | ||
636 | b->shadowed = *here; | |
637 | *here = b; | |
638 | } | |
639 | ||
640 | /* Clear the binding structure B, stick it on the binding_freelist, | |
641 | and return the former value of b->prev. This is used by pop_scope | |
642 | and get_parm_info to iterate destructively over all the bindings | |
643 | from a given scope. */ | |
644 | static struct c_binding * | |
645 | free_binding_and_advance (struct c_binding *b) | |
646 | { | |
647 | struct c_binding *prev = b->prev; | |
648 | ||
9aaabf8a | 649 | memset (b, 0, sizeof (struct c_binding)); |
f75fbaf7 ZW |
650 | b->prev = binding_freelist; |
651 | binding_freelist = b; | |
652 | ||
653 | return prev; | |
654 | } | |
655 | ||
e1b7793c ILT |
656 | /* Bind a label. Like bind, but skip fields which aren't used for |
657 | labels, and add the LABEL_VARS value. */ | |
658 | static void | |
659 | bind_label (tree name, tree label, struct c_scope *scope, | |
660 | struct c_label_vars *label_vars) | |
661 | { | |
662 | struct c_binding *b; | |
663 | ||
664 | bind (name, label, scope, /*invisible=*/false, /*nested=*/false, | |
665 | UNKNOWN_LOCATION); | |
666 | ||
667 | scope->has_label_bindings = true; | |
668 | ||
669 | b = scope->bindings; | |
670 | gcc_assert (b->decl == label); | |
671 | label_vars->shadowed = b->u.label; | |
672 | b->u.label = label_vars; | |
673 | } | |
51e29401 | 674 | \f |
b4892310 | 675 | /* Hook called at end of compilation to assume 1 elt |
f8521984 | 676 | for a file-scope tentative array defn that wasn't complete before. */ |
6645c3fa | 677 | |
b4892310 | 678 | void |
35b1a6fa | 679 | c_finish_incomplete_decl (tree decl) |
b4892310 | 680 | { |
5cfac96e | 681 | if (TREE_CODE (decl) == VAR_DECL) |
b4892310 RS |
682 | { |
683 | tree type = TREE_TYPE (decl); | |
5cfac96e RK |
684 | if (type != error_mark_node |
685 | && TREE_CODE (type) == ARRAY_TYPE | |
3f75a254 | 686 | && !DECL_EXTERNAL (decl) |
5cfac96e | 687 | && TYPE_DOMAIN (type) == 0) |
b4892310 | 688 | { |
c2255bc4 AH |
689 | warning_at (DECL_SOURCE_LOCATION (decl), |
690 | 0, "array %q+D assumed to have one element", decl); | |
5cfac96e | 691 | |
aab038d5 | 692 | complete_array_type (&TREE_TYPE (decl), NULL_TREE, true); |
b4892310 RS |
693 | |
694 | layout_decl (decl, 0); | |
695 | } | |
696 | } | |
697 | } | |
698 | \f | |
991d6621 JM |
699 | /* Record that inline function FUNC contains a reference (location |
700 | LOC) to static DECL (file-scope or function-local according to | |
701 | TYPE). */ | |
702 | ||
703 | void | |
704 | record_inline_static (location_t loc, tree func, tree decl, | |
705 | enum c_inline_static_type type) | |
706 | { | |
a9429e29 | 707 | struct c_inline_static *csi = ggc_alloc_c_inline_static (); |
991d6621 JM |
708 | csi->location = loc; |
709 | csi->function = func; | |
710 | csi->static_decl = decl; | |
711 | csi->type = type; | |
712 | csi->next = c_inline_statics; | |
713 | c_inline_statics = csi; | |
714 | } | |
715 | ||
716 | /* Check for references to static declarations in inline functions at | |
717 | the end of the translation unit and diagnose them if the functions | |
718 | are still inline definitions. */ | |
719 | ||
720 | static void | |
721 | check_inline_statics (void) | |
722 | { | |
723 | struct c_inline_static *csi; | |
724 | for (csi = c_inline_statics; csi; csi = csi->next) | |
725 | { | |
726 | if (DECL_EXTERNAL (csi->function)) | |
727 | switch (csi->type) | |
728 | { | |
729 | case csi_internal: | |
730 | pedwarn (csi->location, 0, | |
731 | "%qD is static but used in inline function %qD " | |
732 | "which is not static", csi->static_decl, csi->function); | |
733 | break; | |
734 | case csi_modifiable: | |
735 | pedwarn (csi->location, 0, | |
736 | "%q+D is static but declared in inline function %qD " | |
737 | "which is not static", csi->static_decl, csi->function); | |
738 | break; | |
739 | default: | |
740 | gcc_unreachable (); | |
741 | } | |
742 | } | |
743 | c_inline_statics = NULL; | |
744 | } | |
745 | \f | |
e1b7793c ILT |
746 | /* Fill in a c_spot_bindings structure. If DEFINING is true, set it |
747 | for the current state, otherwise set it to uninitialized. */ | |
748 | ||
749 | static void | |
750 | set_spot_bindings (struct c_spot_bindings *p, bool defining) | |
751 | { | |
752 | if (defining) | |
753 | { | |
754 | p->scope = current_scope; | |
755 | p->bindings_in_scope = current_scope->bindings; | |
756 | } | |
757 | else | |
758 | { | |
759 | p->scope = NULL; | |
760 | p->bindings_in_scope = NULL; | |
761 | } | |
762 | p->stmt_exprs = 0; | |
763 | p->left_stmt_expr = false; | |
764 | } | |
765 | ||
766 | /* Return true if we will want to say something if a goto statement | |
767 | crosses DECL. */ | |
768 | ||
769 | static bool | |
770 | decl_jump_unsafe (tree decl) | |
771 | { | |
772 | if (decl == error_mark_node || TREE_TYPE (decl) == error_mark_node) | |
773 | return false; | |
774 | ||
775 | /* Always warn about crossing variably modified types. */ | |
776 | if ((TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == TYPE_DECL) | |
777 | && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) | |
778 | return true; | |
779 | ||
780 | /* Otherwise, only warn if -Wgoto-misses-init and this is an | |
781 | initialized automatic decl. */ | |
782 | if (warn_jump_misses_init | |
783 | && TREE_CODE (decl) == VAR_DECL | |
784 | && !TREE_STATIC (decl) | |
785 | && DECL_INITIAL (decl) != NULL_TREE) | |
786 | return true; | |
787 | ||
788 | return false; | |
789 | } | |
790 | ||
791 | /* Update spot bindings P as we pop out of SCOPE. Return true if we | |
792 | should push decls for a label. */ | |
793 | ||
794 | static bool | |
795 | update_spot_bindings (struct c_scope *scope, struct c_spot_bindings *p) | |
796 | { | |
797 | if (p->scope != scope) | |
798 | { | |
799 | /* This label or goto is defined in some other scope, or it is a | |
800 | label which is not yet defined. There is nothing to | |
801 | update. */ | |
802 | return false; | |
803 | } | |
804 | ||
805 | /* Adjust the spot bindings to refer to the bindings already defined | |
806 | in the enclosing scope. */ | |
807 | p->scope = scope->outer; | |
808 | p->bindings_in_scope = p->scope->bindings; | |
809 | ||
810 | return true; | |
811 | } | |
812 | \f | |
264fa2db ZL |
813 | /* The Objective-C front-end often needs to determine the current scope. */ |
814 | ||
815 | void * | |
bc095846 | 816 | objc_get_current_scope (void) |
264fa2db ZL |
817 | { |
818 | return current_scope; | |
819 | } | |
820 | ||
821 | /* The following function is used only by Objective-C. It needs to live here | |
822 | because it accesses the innards of c_scope. */ | |
823 | ||
824 | void | |
825 | objc_mark_locals_volatile (void *enclosing_blk) | |
826 | { | |
827 | struct c_scope *scope; | |
f75fbaf7 | 828 | struct c_binding *b; |
e13e48e7 EC |
829 | |
830 | for (scope = current_scope; | |
264fa2db ZL |
831 | scope && scope != enclosing_blk; |
832 | scope = scope->outer) | |
833 | { | |
f75fbaf7 | 834 | for (b = scope->bindings; b; b = b->prev) |
58393038 | 835 | objc_volatilize_decl (b->decl); |
f75fbaf7 | 836 | |
264fa2db ZL |
837 | /* Do not climb up past the current function. */ |
838 | if (scope->function_body) | |
839 | break; | |
e13e48e7 EC |
840 | } |
841 | } | |
842 | ||
f75fbaf7 | 843 | /* Nonzero if we are currently in file scope. */ |
51e29401 RS |
844 | |
845 | int | |
35b1a6fa | 846 | global_bindings_p (void) |
51e29401 | 847 | { |
e11187cc JM |
848 | return (current_scope == file_scope && !c_override_global_bindings_to_false |
849 | ? -1 | |
850 | : 0); | |
51e29401 RS |
851 | } |
852 | ||
853 | void | |
35b1a6fa | 854 | keep_next_level (void) |
51e29401 | 855 | { |
14e33ee8 | 856 | keep_next_level_flag = true; |
51e29401 RS |
857 | } |
858 | ||
6ec637a4 JJ |
859 | /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */ |
860 | ||
861 | void | |
862 | set_float_const_decimal64 (void) | |
863 | { | |
864 | current_scope->float_const_decimal64 = true; | |
865 | } | |
866 | ||
867 | /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */ | |
868 | ||
869 | void | |
870 | clear_float_const_decimal64 (void) | |
871 | { | |
872 | current_scope->float_const_decimal64 = false; | |
873 | } | |
874 | ||
875 | /* Return nonzero if an unsuffixed float constant is _Decimal64. */ | |
876 | ||
877 | bool | |
878 | float_const_decimal64_p (void) | |
879 | { | |
880 | return current_scope->float_const_decimal64; | |
881 | } | |
882 | ||
f8521984 | 883 | /* Identify this scope as currently being filled with parameters. */ |
51e29401 RS |
884 | |
885 | void | |
eb1dfbb2 | 886 | declare_parm_level (void) |
51e29401 | 887 | { |
f8521984 | 888 | current_scope->parm_flag = true; |
51e29401 RS |
889 | } |
890 | ||
51e29401 | 891 | void |
f75fbaf7 | 892 | push_scope (void) |
51e29401 | 893 | { |
a8ccdffe | 894 | if (next_is_function_body) |
51e29401 | 895 | { |
339a28b9 ZW |
896 | /* This is the transition from the parameters to the top level |
897 | of the function body. These are the same scope | |
f8521984 | 898 | (C99 6.2.1p4,6) so we do not push another scope structure. |
a8ccdffe ZW |
899 | next_is_function_body is set only by store_parm_decls, which |
900 | in turn is called when and only when we are about to | |
901 | encounter the opening curly brace for the function body. | |
339a28b9 | 902 | |
a8ccdffe ZW |
903 | The outermost block of a function always gets a BLOCK node, |
904 | because the debugging output routines expect that each | |
59e4e217 | 905 | function has at least one BLOCK. */ |
f8521984 ZW |
906 | current_scope->parm_flag = false; |
907 | current_scope->function_body = true; | |
a8ccdffe | 908 | current_scope->keep = true; |
f8521984 ZW |
909 | current_scope->outer_function = current_function_scope; |
910 | current_function_scope = current_scope; | |
14e33ee8 ZW |
911 | |
912 | keep_next_level_flag = false; | |
a8ccdffe | 913 | next_is_function_body = false; |
6ec637a4 JJ |
914 | |
915 | /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */ | |
916 | if (current_scope->outer) | |
917 | current_scope->float_const_decimal64 | |
918 | = current_scope->outer->float_const_decimal64; | |
919 | else | |
920 | current_scope->float_const_decimal64 = false; | |
51e29401 | 921 | } |
339a28b9 ZW |
922 | else |
923 | { | |
f75fbaf7 ZW |
924 | struct c_scope *scope; |
925 | if (scope_freelist) | |
926 | { | |
927 | scope = scope_freelist; | |
928 | scope_freelist = scope->outer; | |
929 | } | |
930 | else | |
a9429e29 | 931 | scope = ggc_alloc_cleared_c_scope (); |
51e29401 | 932 | |
6ec637a4 JJ |
933 | /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */ |
934 | if (current_scope) | |
935 | scope->float_const_decimal64 = current_scope->float_const_decimal64; | |
936 | else | |
937 | scope->float_const_decimal64 = false; | |
938 | ||
f8521984 ZW |
939 | scope->keep = keep_next_level_flag; |
940 | scope->outer = current_scope; | |
f75fbaf7 ZW |
941 | scope->depth = current_scope ? (current_scope->depth + 1) : 0; |
942 | ||
943 | /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but | |
944 | possible. */ | |
945 | if (current_scope && scope->depth == 0) | |
946 | { | |
947 | scope->depth--; | |
72c4e4db | 948 | sorry ("GCC supports only %u nested scopes", scope->depth); |
f75fbaf7 | 949 | } |
118a3a8b | 950 | |
f8521984 ZW |
951 | current_scope = scope; |
952 | keep_next_level_flag = false; | |
339a28b9 | 953 | } |
0500d6f9 | 954 | } |
6645c3fa | 955 | |
e1b7793c ILT |
956 | /* This is called when we are leaving SCOPE. For each label defined |
957 | in SCOPE, add any appropriate decls to its decls_in_scope fields. | |
958 | These are the decls whose initialization will be skipped by a goto | |
959 | later in the function. */ | |
960 | ||
961 | static void | |
962 | update_label_decls (struct c_scope *scope) | |
963 | { | |
964 | struct c_scope *s; | |
965 | ||
966 | s = scope; | |
967 | while (s != NULL) | |
968 | { | |
969 | if (s->has_label_bindings) | |
970 | { | |
971 | struct c_binding *b; | |
972 | ||
973 | for (b = s->bindings; b != NULL; b = b->prev) | |
974 | { | |
975 | struct c_label_vars *label_vars; | |
976 | struct c_binding *b1; | |
977 | unsigned int ix; | |
978 | struct c_goto_bindings *g; | |
979 | ||
980 | if (TREE_CODE (b->decl) != LABEL_DECL) | |
981 | continue; | |
982 | label_vars = b->u.label; | |
983 | ||
984 | b1 = label_vars->label_bindings.bindings_in_scope; | |
985 | if (update_spot_bindings (scope, &label_vars->label_bindings)) | |
986 | { | |
987 | /* This label is defined in this scope. */ | |
988 | for (; b1 != NULL; b1 = b1->prev) | |
989 | { | |
990 | /* A goto from later in the function to this | |
991 | label will never see the initialization of | |
992 | B1, if any. Save it to issue a warning if | |
993 | needed. */ | |
994 | if (decl_jump_unsafe (b1->decl)) | |
995 | VEC_safe_push (tree, gc, label_vars->decls_in_scope, | |
996 | b1->decl); | |
997 | } | |
998 | } | |
999 | ||
1000 | /* Update the bindings of any goto statements associated | |
1001 | with this label. */ | |
1002 | for (ix = 0; | |
1003 | VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g); | |
1004 | ++ix) | |
1005 | update_spot_bindings (scope, &g->goto_bindings); | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | /* Don't search beyond the current function. */ | |
1010 | if (s == current_function_scope) | |
1011 | break; | |
1012 | ||
1013 | s = s->outer; | |
1014 | } | |
1015 | } | |
1016 | ||
9affb2c7 ZW |
1017 | /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */ |
1018 | ||
1019 | static void | |
1020 | set_type_context (tree type, tree context) | |
1021 | { | |
1022 | for (type = TYPE_MAIN_VARIANT (type); type; | |
1023 | type = TYPE_NEXT_VARIANT (type)) | |
1024 | TYPE_CONTEXT (type) = context; | |
1025 | } | |
1026 | ||
f8521984 | 1027 | /* Exit a scope. Restore the state of the identifier-decl mappings |
f75fbaf7 ZW |
1028 | that were in effect when this scope was entered. Return a BLOCK |
1029 | node containing all the DECLs in this scope that are of interest | |
1030 | to debug info generation. */ | |
51e29401 RS |
1031 | |
1032 | tree | |
f75fbaf7 | 1033 | pop_scope (void) |
51e29401 | 1034 | { |
f91f41b2 | 1035 | struct c_scope *scope = current_scope; |
f75fbaf7 ZW |
1036 | tree block, context, p; |
1037 | struct c_binding *b; | |
9cd51ef6 | 1038 | |
f75fbaf7 ZW |
1039 | bool functionbody = scope->function_body; |
1040 | bool keep = functionbody || scope->keep || scope->bindings; | |
f91f41b2 | 1041 | |
e1b7793c | 1042 | update_label_decls (scope); |
187230a7 | 1043 | |
f91f41b2 ZW |
1044 | /* If appropriate, create a BLOCK to record the decls for the life |
1045 | of this function. */ | |
1046 | block = 0; | |
1047 | if (keep) | |
1048 | { | |
1049 | block = make_node (BLOCK); | |
f91f41b2 ZW |
1050 | BLOCK_SUBBLOCKS (block) = scope->blocks; |
1051 | TREE_USED (block) = 1; | |
f91f41b2 | 1052 | |
f75fbaf7 | 1053 | /* In each subblock, record that this is its superior. */ |
87caf699 | 1054 | for (p = scope->blocks; p; p = BLOCK_CHAIN (p)) |
f75fbaf7 | 1055 | BLOCK_SUPERCONTEXT (p) = block; |
f91f41b2 | 1056 | |
f75fbaf7 ZW |
1057 | BLOCK_VARS (block) = 0; |
1058 | } | |
339a28b9 | 1059 | |
f75fbaf7 ZW |
1060 | /* The TYPE_CONTEXTs for all of the tagged types belonging to this |
1061 | scope must be set so that they point to the appropriate | |
1062 | construct, i.e. either to the current FUNCTION_DECL node, or | |
1063 | else to the BLOCK node we just constructed. | |
f91f41b2 | 1064 | |
f75fbaf7 ZW |
1065 | Note that for tagged types whose scope is just the formal |
1066 | parameter list for some function type specification, we can't | |
1067 | properly set their TYPE_CONTEXTs here, because we don't have a | |
1068 | pointer to the appropriate FUNCTION_TYPE node readily available | |
1069 | to us. For those cases, the TYPE_CONTEXTs of the relevant tagged | |
1070 | type nodes get set in `grokdeclarator' as soon as we have created | |
1071 | the FUNCTION_TYPE node which will represent the "scope" for these | |
1072 | "parameter list local" tagged types. */ | |
1073 | if (scope->function_body) | |
1074 | context = current_function_decl; | |
1075 | else if (scope == file_scope) | |
eecec698 | 1076 | { |
c2255bc4 AH |
1077 | tree file_decl = build_decl (UNKNOWN_LOCATION, |
1078 | TRANSLATION_UNIT_DECL, 0, 0); | |
eecec698 ZW |
1079 | TREE_CHAIN (file_decl) = all_translation_units; |
1080 | all_translation_units = file_decl; | |
1081 | context = file_decl; | |
1082 | } | |
f75fbaf7 ZW |
1083 | else |
1084 | context = block; | |
f91f41b2 | 1085 | |
f75fbaf7 ZW |
1086 | /* Clear all bindings in this scope. */ |
1087 | for (b = scope->bindings; b; b = free_binding_and_advance (b)) | |
339a28b9 | 1088 | { |
f75fbaf7 | 1089 | p = b->decl; |
f91f41b2 | 1090 | switch (TREE_CODE (p)) |
14e33ee8 | 1091 | { |
f91f41b2 | 1092 | case LABEL_DECL: |
f75fbaf7 | 1093 | /* Warnings for unused labels, errors for undefined labels. */ |
f91f41b2 | 1094 | if (TREE_USED (p) && !DECL_INITIAL (p)) |
14e33ee8 | 1095 | { |
dee15844 | 1096 | error ("label %q+D used but not defined", p); |
f91f41b2 | 1097 | DECL_INITIAL (p) = error_mark_node; |
14e33ee8 | 1098 | } |
b8698a0f | 1099 | else |
c616e51b MLI |
1100 | warn_for_unused_label (p); |
1101 | ||
f75fbaf7 ZW |
1102 | /* Labels go in BLOCK_VARS. */ |
1103 | TREE_CHAIN (p) = BLOCK_VARS (block); | |
1104 | BLOCK_VARS (block) = p; | |
366de0ce | 1105 | gcc_assert (I_LABEL_BINDING (b->id) == b); |
c22cacf3 | 1106 | I_LABEL_BINDING (b->id) = b->shadowed; |
e1b7793c ILT |
1107 | |
1108 | /* Also pop back to the shadowed label_vars. */ | |
1109 | release_tree_vector (b->u.label->decls_in_scope); | |
1110 | b->u.label = b->u.label->shadowed; | |
c22cacf3 | 1111 | break; |
339a28b9 | 1112 | |
f75fbaf7 ZW |
1113 | case ENUMERAL_TYPE: |
1114 | case UNION_TYPE: | |
1115 | case RECORD_TYPE: | |
9affb2c7 | 1116 | set_type_context (p, context); |
f75fbaf7 ZW |
1117 | |
1118 | /* Types may not have tag-names, in which case the type | |
1119 | appears in the bindings list with b->id NULL. */ | |
1120 | if (b->id) | |
1121 | { | |
366de0ce | 1122 | gcc_assert (I_TAG_BINDING (b->id) == b); |
f75fbaf7 ZW |
1123 | I_TAG_BINDING (b->id) = b->shadowed; |
1124 | } | |
c22cacf3 | 1125 | break; |
339a28b9 | 1126 | |
f91f41b2 | 1127 | case FUNCTION_DECL: |
f75fbaf7 ZW |
1128 | /* Propagate TREE_ADDRESSABLE from nested functions to their |
1129 | containing functions. */ | |
3f75a254 | 1130 | if (!TREE_ASM_WRITTEN (p) |
f91f41b2 ZW |
1131 | && DECL_INITIAL (p) != 0 |
1132 | && TREE_ADDRESSABLE (p) | |
1133 | && DECL_ABSTRACT_ORIGIN (p) != 0 | |
1134 | && DECL_ABSTRACT_ORIGIN (p) != p) | |
1135 | TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1; | |
73aea290 | 1136 | if (!DECL_EXTERNAL (p) |
71113fcd GK |
1137 | && !DECL_INITIAL (p) |
1138 | && scope != file_scope | |
1139 | && scope != external_scope) | |
73aea290 | 1140 | { |
dee15844 | 1141 | error ("nested function %q+D declared but never defined", p); |
73aea290 JM |
1142 | undef_nested_function = true; |
1143 | } | |
71113fcd GK |
1144 | else if (DECL_DECLARED_INLINE_P (p) |
1145 | && TREE_PUBLIC (p) | |
d0728ae0 JJ |
1146 | && !DECL_INITIAL (p)) |
1147 | { | |
1148 | /* C99 6.7.4p6: "a function with external linkage... declared | |
1149 | with an inline function specifier ... shall also be defined | |
1150 | in the same translation unit." */ | |
1151 | if (!flag_gnu89_inline) | |
1152 | pedwarn (input_location, 0, | |
1153 | "inline function %q+D declared but never defined", p); | |
1154 | DECL_EXTERNAL (p) = 1; | |
1155 | } | |
71113fcd | 1156 | |
f75fbaf7 | 1157 | goto common_symbol; |
f91f41b2 ZW |
1158 | |
1159 | case VAR_DECL: | |
caf93cb0 | 1160 | /* Warnings for unused variables. */ |
ebfbbdc5 | 1161 | if ((!TREE_USED (p) || !DECL_READ_P (p)) |
f95f80d1 | 1162 | && !TREE_NO_WARNING (p) |
f91f41b2 ZW |
1163 | && !DECL_IN_SYSTEM_HEADER (p) |
1164 | && DECL_NAME (p) | |
f75fbaf7 | 1165 | && !DECL_ARTIFICIAL (p) |
29128154 | 1166 | && scope != file_scope |
c22cacf3 | 1167 | && scope != external_scope) |
ebfbbdc5 JJ |
1168 | { |
1169 | if (!TREE_USED (p)) | |
1170 | warning (OPT_Wunused_variable, "unused variable %q+D", p); | |
1171 | else if (DECL_CONTEXT (p) == current_function_decl) | |
1172 | warning_at (DECL_SOURCE_LOCATION (p), | |
1173 | OPT_Wunused_but_set_variable, | |
1174 | "variable %qD set but not used", p); | |
1175 | } | |
f75fbaf7 | 1176 | |
0b410f0b JM |
1177 | if (b->inner_comp) |
1178 | { | |
dee15844 JM |
1179 | error ("type of array %q+D completed incompatibly with" |
1180 | " implicit initialization", p); | |
0b410f0b JM |
1181 | } |
1182 | ||
a1105617 | 1183 | /* Fall through. */ |
f75fbaf7 ZW |
1184 | case TYPE_DECL: |
1185 | case CONST_DECL: | |
1186 | common_symbol: | |
1187 | /* All of these go in BLOCK_VARS, but only if this is the | |
1188 | binding in the home scope. */ | |
9aaabf8a | 1189 | if (!b->nested) |
f75fbaf7 ZW |
1190 | { |
1191 | TREE_CHAIN (p) = BLOCK_VARS (block); | |
1192 | BLOCK_VARS (block) = p; | |
1193 | } | |
b3f27c15 JJ |
1194 | else if (VAR_OR_FUNCTION_DECL_P (p)) |
1195 | { | |
1196 | /* For block local externs add a special | |
1197 | DECL_EXTERNAL decl for debug info generation. */ | |
1198 | tree extp = copy_node (p); | |
1199 | ||
1200 | DECL_EXTERNAL (extp) = 1; | |
1201 | TREE_STATIC (extp) = 0; | |
1202 | TREE_PUBLIC (extp) = 1; | |
1203 | DECL_INITIAL (extp) = NULL_TREE; | |
1204 | DECL_LANG_SPECIFIC (extp) = NULL; | |
1205 | DECL_CONTEXT (extp) = current_function_decl; | |
1206 | if (TREE_CODE (p) == FUNCTION_DECL) | |
1207 | { | |
1208 | DECL_RESULT (extp) = NULL_TREE; | |
1209 | DECL_SAVED_TREE (extp) = NULL_TREE; | |
1210 | DECL_STRUCT_FUNCTION (extp) = NULL; | |
1211 | } | |
1212 | if (b->locus != UNKNOWN_LOCATION) | |
1213 | DECL_SOURCE_LOCATION (extp) = b->locus; | |
1214 | TREE_CHAIN (extp) = BLOCK_VARS (block); | |
1215 | BLOCK_VARS (block) = extp; | |
1216 | } | |
5b02f0e0 ZW |
1217 | /* If this is the file scope, and we are processing more |
1218 | than one translation unit in this compilation, set | |
1219 | DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL. | |
1220 | This makes same_translation_unit_p work, and causes | |
1221 | static declarations to be given disambiguating suffixes. */ | |
1222 | if (scope == file_scope && num_in_fnames > 1) | |
9affb2c7 ZW |
1223 | { |
1224 | DECL_CONTEXT (p) = context; | |
1225 | if (TREE_CODE (p) == TYPE_DECL) | |
1226 | set_type_context (TREE_TYPE (p), context); | |
1227 | } | |
55d54003 | 1228 | |
f75fbaf7 ZW |
1229 | /* Fall through. */ |
1230 | /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have | |
1231 | already been put there by store_parm_decls. Unused- | |
1232 | parameter warnings are handled by function.c. | |
1233 | error_mark_node obviously does not go in BLOCK_VARS and | |
1234 | does not get unused-variable warnings. */ | |
1235 | case PARM_DECL: | |
1236 | case ERROR_MARK: | |
1237 | /* It is possible for a decl not to have a name. We get | |
1238 | here with b->id NULL in this case. */ | |
1239 | if (b->id) | |
f91f41b2 | 1240 | { |
366de0ce | 1241 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); |
f75fbaf7 | 1242 | I_SYMBOL_BINDING (b->id) = b->shadowed; |
e1b7793c ILT |
1243 | if (b->shadowed && b->shadowed->u.type) |
1244 | TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type; | |
f91f41b2 ZW |
1245 | } |
1246 | break; | |
f75fbaf7 ZW |
1247 | |
1248 | default: | |
366de0ce | 1249 | gcc_unreachable (); |
f91f41b2 ZW |
1250 | } |
1251 | } | |
339a28b9 | 1252 | |
118a3a8b | 1253 | |
f75fbaf7 ZW |
1254 | /* Dispose of the block that we just made inside some higher level. */ |
1255 | if ((scope->function_body || scope == file_scope) && context) | |
339a28b9 | 1256 | { |
f75fbaf7 ZW |
1257 | DECL_INITIAL (context) = block; |
1258 | BLOCK_SUPERCONTEXT (block) = context; | |
339a28b9 | 1259 | } |
f91f41b2 | 1260 | else if (scope->outer) |
3bf40d18 | 1261 | { |
f91f41b2 ZW |
1262 | if (block) |
1263 | SCOPE_LIST_APPEND (scope->outer, blocks, block); | |
1264 | /* If we did not make a block for the scope just exited, any | |
1265 | blocks made for inner scopes must be carried forward so they | |
1266 | will later become subblocks of something else. */ | |
1267 | else if (scope->blocks) | |
1268 | SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks); | |
3bf40d18 | 1269 | } |
51e29401 | 1270 | |
f8521984 | 1271 | /* Pop the current scope, and free the structure for reuse. */ |
f75fbaf7 ZW |
1272 | current_scope = scope->outer; |
1273 | if (scope->function_body) | |
1274 | current_function_scope = scope->outer_function; | |
1275 | ||
1276 | memset (scope, 0, sizeof (struct c_scope)); | |
1277 | scope->outer = scope_freelist; | |
1278 | scope_freelist = scope; | |
51e29401 | 1279 | |
51e29401 RS |
1280 | return block; |
1281 | } | |
3bf40d18 | 1282 | |
f75fbaf7 ZW |
1283 | void |
1284 | push_file_scope (void) | |
1285 | { | |
1286 | tree decl; | |
f75fbaf7 | 1287 | |
f6bf7bb6 AP |
1288 | if (file_scope) |
1289 | return; | |
1290 | ||
f75fbaf7 ZW |
1291 | push_scope (); |
1292 | file_scope = current_scope; | |
1293 | ||
1294 | start_fname_decls (); | |
1295 | ||
1296 | for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl)) | |
9aaabf8a | 1297 | bind (DECL_NAME (decl), decl, file_scope, |
b3f27c15 | 1298 | /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl)); |
f75fbaf7 ZW |
1299 | } |
1300 | ||
1301 | void | |
1302 | pop_file_scope (void) | |
1303 | { | |
1304 | /* In case there were missing closebraces, get us back to the global | |
1305 | binding level. */ | |
1306 | while (current_scope != file_scope) | |
1307 | pop_scope (); | |
1308 | ||
1309 | /* __FUNCTION__ is defined at file scope (""). This | |
1310 | call may not be necessary as my tests indicate it | |
1311 | still works without it. */ | |
1312 | finish_fname_decls (); | |
1313 | ||
991d6621 JM |
1314 | check_inline_statics (); |
1315 | ||
36c1b0de ZW |
1316 | /* This is the point to write out a PCH if we're doing that. |
1317 | In that case we do not want to do anything else. */ | |
f75fbaf7 | 1318 | if (pch_file) |
36c1b0de ZW |
1319 | { |
1320 | c_common_write_pch (); | |
1321 | return; | |
1322 | } | |
f75fbaf7 | 1323 | |
36c1b0de | 1324 | /* Pop off the file scope and close this translation unit. */ |
f75fbaf7 ZW |
1325 | pop_scope (); |
1326 | file_scope = 0; | |
bedb9fc0 RH |
1327 | |
1328 | maybe_apply_pending_pragma_weaks (); | |
f75fbaf7 | 1329 | } |
e1b7793c ILT |
1330 | \f |
1331 | /* Adjust the bindings for the start of a statement expression. */ | |
1332 | ||
1333 | void | |
1334 | c_bindings_start_stmt_expr (struct c_spot_bindings* switch_bindings) | |
1335 | { | |
1336 | struct c_scope *scope; | |
1337 | ||
1338 | for (scope = current_scope; scope != NULL; scope = scope->outer) | |
1339 | { | |
1340 | struct c_binding *b; | |
1341 | ||
1342 | if (!scope->has_label_bindings) | |
1343 | continue; | |
1344 | ||
1345 | for (b = scope->bindings; b != NULL; b = b->prev) | |
1346 | { | |
1347 | struct c_label_vars *label_vars; | |
1348 | unsigned int ix; | |
1349 | struct c_goto_bindings *g; | |
1350 | ||
1351 | if (TREE_CODE (b->decl) != LABEL_DECL) | |
1352 | continue; | |
1353 | label_vars = b->u.label; | |
1354 | ++label_vars->label_bindings.stmt_exprs; | |
1355 | for (ix = 0; | |
1356 | VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g); | |
1357 | ++ix) | |
1358 | ++g->goto_bindings.stmt_exprs; | |
1359 | } | |
1360 | } | |
1361 | ||
1362 | if (switch_bindings != NULL) | |
1363 | ++switch_bindings->stmt_exprs; | |
1364 | } | |
1365 | ||
1366 | /* Adjust the bindings for the end of a statement expression. */ | |
1367 | ||
1368 | void | |
1369 | c_bindings_end_stmt_expr (struct c_spot_bindings *switch_bindings) | |
1370 | { | |
1371 | struct c_scope *scope; | |
1372 | ||
1373 | for (scope = current_scope; scope != NULL; scope = scope->outer) | |
1374 | { | |
1375 | struct c_binding *b; | |
1376 | ||
1377 | if (!scope->has_label_bindings) | |
1378 | continue; | |
1379 | ||
1380 | for (b = scope->bindings; b != NULL; b = b->prev) | |
1381 | { | |
1382 | struct c_label_vars *label_vars; | |
1383 | unsigned int ix; | |
1384 | struct c_goto_bindings *g; | |
1385 | ||
1386 | if (TREE_CODE (b->decl) != LABEL_DECL) | |
1387 | continue; | |
1388 | label_vars = b->u.label; | |
1389 | --label_vars->label_bindings.stmt_exprs; | |
1390 | if (label_vars->label_bindings.stmt_exprs < 0) | |
1391 | { | |
1392 | label_vars->label_bindings.left_stmt_expr = true; | |
1393 | label_vars->label_bindings.stmt_exprs = 0; | |
1394 | } | |
1395 | for (ix = 0; | |
1396 | VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g); | |
1397 | ++ix) | |
1398 | { | |
1399 | --g->goto_bindings.stmt_exprs; | |
1400 | if (g->goto_bindings.stmt_exprs < 0) | |
1401 | { | |
1402 | g->goto_bindings.left_stmt_expr = true; | |
1403 | g->goto_bindings.stmt_exprs = 0; | |
1404 | } | |
1405 | } | |
1406 | } | |
1407 | } | |
f75fbaf7 | 1408 | |
e1b7793c ILT |
1409 | if (switch_bindings != NULL) |
1410 | { | |
1411 | --switch_bindings->stmt_exprs; | |
1412 | gcc_assert (switch_bindings->stmt_exprs >= 0); | |
1413 | } | |
1414 | } | |
51e29401 | 1415 | \f |
51e29401 RS |
1416 | /* Push a definition or a declaration of struct, union or enum tag "name". |
1417 | "type" should be the type node. | |
c2255bc4 AH |
1418 | We assume that the tag "name" is not already defined, and has a location |
1419 | of LOC. | |
51e29401 RS |
1420 | |
1421 | Note that the definition may really be just a forward reference. | |
1422 | In that case, the TYPE_SIZE will be zero. */ | |
1423 | ||
f75fbaf7 | 1424 | static void |
c2255bc4 | 1425 | pushtag (location_t loc, tree name, tree type) |
51e29401 | 1426 | { |
14077d68 | 1427 | /* Record the identifier as the type's name if it has none. */ |
f75fbaf7 ZW |
1428 | if (name && !TYPE_NAME (type)) |
1429 | TYPE_NAME (type) = name; | |
24b97832 | 1430 | bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false, loc); |
c138f328 | 1431 | |
51e29401 | 1432 | /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the |
f8521984 | 1433 | tagged type we just added to the current scope. This fake |
51e29401 | 1434 | NULL-named TYPE_DECL node helps dwarfout.c to know when it needs |
858a47b1 | 1435 | to output a representation of a tagged type, and it also gives |
51e29401 RS |
1436 | us a convenient place to record the "scope start" address for the |
1437 | tagged type. */ | |
1438 | ||
c2255bc4 AH |
1439 | TYPE_STUB_DECL (type) = pushdecl (build_decl (loc, |
1440 | TYPE_DECL, NULL_TREE, type)); | |
88dad228 JM |
1441 | |
1442 | /* An approximation for now, so we can tell this is a function-scope tag. | |
f75fbaf7 | 1443 | This will be updated in pop_scope. */ |
88dad228 | 1444 | TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type)); |
7e5487a2 ILT |
1445 | |
1446 | if (warn_cxx_compat && name != NULL_TREE) | |
1447 | { | |
1448 | struct c_binding *b = I_SYMBOL_BINDING (name); | |
1449 | ||
1450 | if (b != NULL | |
1451 | && b->decl != NULL_TREE | |
1452 | && TREE_CODE (b->decl) == TYPE_DECL | |
1453 | && (B_IN_CURRENT_SCOPE (b) | |
1454 | || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b))) | |
1455 | && (TYPE_MAIN_VARIANT (TREE_TYPE (b->decl)) | |
1456 | != TYPE_MAIN_VARIANT (type))) | |
1457 | { | |
1458 | warning_at (loc, OPT_Wc___compat, | |
1459 | ("using %qD as both a typedef and a tag is " | |
1460 | "invalid in C++"), | |
1461 | b->decl); | |
1462 | if (b->locus != UNKNOWN_LOCATION) | |
1463 | inform (b->locus, "originally defined here"); | |
1464 | } | |
1465 | } | |
51e29401 RS |
1466 | } |
1467 | \f | |
3c6e6fbf | 1468 | /* Subroutine of compare_decls. Allow harmless mismatches in return |
6907ddd3 RS |
1469 | and argument types provided that the type modes match. This function |
1470 | return a unified type given a suitable match, and 0 otherwise. */ | |
1471 | ||
1472 | static tree | |
3c6e6fbf | 1473 | match_builtin_function_types (tree newtype, tree oldtype) |
6907ddd3 RS |
1474 | { |
1475 | tree newrettype, oldrettype; | |
1476 | tree newargs, oldargs; | |
1477 | tree trytype, tryargs; | |
1478 | ||
1479 | /* Accept the return type of the new declaration if same modes. */ | |
1480 | oldrettype = TREE_TYPE (oldtype); | |
1481 | newrettype = TREE_TYPE (newtype); | |
1482 | ||
1483 | if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype)) | |
1484 | return 0; | |
1485 | ||
1486 | oldargs = TYPE_ARG_TYPES (oldtype); | |
1487 | newargs = TYPE_ARG_TYPES (newtype); | |
1488 | tryargs = newargs; | |
1489 | ||
1490 | while (oldargs || newargs) | |
1491 | { | |
3f75a254 JM |
1492 | if (!oldargs |
1493 | || !newargs | |
1494 | || !TREE_VALUE (oldargs) | |
1495 | || !TREE_VALUE (newargs) | |
6907ddd3 RS |
1496 | || TYPE_MODE (TREE_VALUE (oldargs)) |
1497 | != TYPE_MODE (TREE_VALUE (newargs))) | |
1498 | return 0; | |
1499 | ||
1500 | oldargs = TREE_CHAIN (oldargs); | |
1501 | newargs = TREE_CHAIN (newargs); | |
1502 | } | |
1503 | ||
1504 | trytype = build_function_type (newrettype, tryargs); | |
1505 | return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype)); | |
1506 | } | |
1507 | ||
1f52178b | 1508 | /* Subroutine of diagnose_mismatched_decls. Check for function type |
3c6e6fbf | 1509 | mismatch involving an empty arglist vs a nonempty one and give clearer |
9ac97460 | 1510 | diagnostics. */ |
3c6e6fbf ZW |
1511 | static void |
1512 | diagnose_arglist_conflict (tree newdecl, tree olddecl, | |
1513 | tree newtype, tree oldtype) | |
1514 | { | |
1515 | tree t; | |
51e29401 | 1516 | |
3c6e6fbf | 1517 | if (TREE_CODE (olddecl) != FUNCTION_DECL |
132da1a5 | 1518 | || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype)) |
3c6e6fbf ZW |
1519 | || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0) |
1520 | || | |
1521 | (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0))) | |
1522 | return; | |
bf44f7de | 1523 | |
3c6e6fbf ZW |
1524 | t = TYPE_ARG_TYPES (oldtype); |
1525 | if (t == 0) | |
1526 | t = TYPE_ARG_TYPES (newtype); | |
1527 | for (; t; t = TREE_CHAIN (t)) | |
1528 | { | |
1529 | tree type = TREE_VALUE (t); | |
51e29401 | 1530 | |
3c6e6fbf ZW |
1531 | if (TREE_CHAIN (t) == 0 |
1532 | && TYPE_MAIN_VARIANT (type) != void_type_node) | |
1533 | { | |
1f5b3869 | 1534 | inform (input_location, "a parameter list with an ellipsis can%'t match " |
3c6e6fbf ZW |
1535 | "an empty parameter name list declaration"); |
1536 | break; | |
1537 | } | |
1538 | ||
1539 | if (c_type_promotes_to (type) != type) | |
1540 | { | |
1f5b3869 | 1541 | inform (input_location, "an argument type that has a default promotion can%'t match " |
3c6e6fbf ZW |
1542 | "an empty parameter name list declaration"); |
1543 | break; | |
1544 | } | |
1545 | } | |
1546 | } | |
51e29401 | 1547 | |
3c6e6fbf ZW |
1548 | /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an |
1549 | old-style function definition, NEWDECL is a prototype declaration. | |
1550 | Diagnose inconsistencies in the argument list. Returns TRUE if | |
1551 | the prototype is compatible, FALSE if not. */ | |
1552 | static bool | |
1553 | validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype) | |
1554 | { | |
bc298aa7 ZW |
1555 | tree newargs, oldargs; |
1556 | int i; | |
1557 | ||
2c83be0c | 1558 | #define END_OF_ARGLIST(t) ((t) == void_type_node) |
bc298aa7 ZW |
1559 | |
1560 | oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype); | |
1561 | newargs = TYPE_ARG_TYPES (newtype); | |
1562 | i = 1; | |
1563 | ||
1564 | for (;;) | |
9162542e | 1565 | { |
ffc44ab6 VR |
1566 | tree oldargtype = TREE_VALUE (oldargs); |
1567 | tree newargtype = TREE_VALUE (newargs); | |
1568 | ||
1569 | if (oldargtype == error_mark_node || newargtype == error_mark_node) | |
1570 | return false; | |
1571 | ||
1572 | oldargtype = TYPE_MAIN_VARIANT (oldargtype); | |
1573 | newargtype = TYPE_MAIN_VARIANT (newargtype); | |
bc298aa7 ZW |
1574 | |
1575 | if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype)) | |
1576 | break; | |
1577 | ||
1578 | /* Reaching the end of just one list means the two decls don't | |
1579 | agree on the number of arguments. */ | |
1580 | if (END_OF_ARGLIST (oldargtype)) | |
9162542e | 1581 | { |
dee15844 JM |
1582 | error ("prototype for %q+D declares more arguments " |
1583 | "than previous old-style definition", newdecl); | |
bc298aa7 | 1584 | return false; |
9162542e | 1585 | } |
bc298aa7 | 1586 | else if (END_OF_ARGLIST (newargtype)) |
3c6e6fbf | 1587 | { |
dee15844 JM |
1588 | error ("prototype for %q+D declares fewer arguments " |
1589 | "than previous old-style definition", newdecl); | |
3c6e6fbf ZW |
1590 | return false; |
1591 | } | |
bc298aa7 ZW |
1592 | |
1593 | /* Type for passing arg must be consistent with that declared | |
1594 | for the arg. */ | |
3f75a254 | 1595 | else if (!comptypes (oldargtype, newargtype)) |
3c6e6fbf | 1596 | { |
dee15844 | 1597 | error ("prototype for %q+D declares argument %d" |
40b97a2e | 1598 | " with incompatible type", |
dee15844 | 1599 | newdecl, i); |
3c6e6fbf ZW |
1600 | return false; |
1601 | } | |
bc298aa7 ZW |
1602 | |
1603 | oldargs = TREE_CHAIN (oldargs); | |
1604 | newargs = TREE_CHAIN (newargs); | |
1605 | i++; | |
9162542e | 1606 | } |
bc298aa7 ZW |
1607 | |
1608 | /* If we get here, no errors were found, but do issue a warning | |
1609 | for this poor-style construct. */ | |
dee15844 JM |
1610 | warning (0, "prototype for %q+D follows non-prototype definition", |
1611 | newdecl); | |
bc298aa7 ZW |
1612 | return true; |
1613 | #undef END_OF_ARGLIST | |
3c6e6fbf | 1614 | } |
4b4e3407 | 1615 | |
3c6e6fbf ZW |
1616 | /* Subroutine of diagnose_mismatched_decls. Report the location of DECL, |
1617 | first in a pair of mismatched declarations, using the diagnostic | |
1618 | function DIAG. */ | |
1619 | static void | |
71205d17 | 1620 | locate_old_decl (tree decl) |
3c6e6fbf ZW |
1621 | { |
1622 | if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl)) | |
1623 | ; | |
1624 | else if (DECL_INITIAL (decl)) | |
1f5b3869 | 1625 | inform (input_location, "previous definition of %q+D was here", decl); |
3c6e6fbf | 1626 | else if (C_DECL_IMPLICIT (decl)) |
1f5b3869 | 1627 | inform (input_location, "previous implicit declaration of %q+D was here", decl); |
3c6e6fbf | 1628 | else |
1f5b3869 | 1629 | inform (input_location, "previous declaration of %q+D was here", decl); |
3c6e6fbf | 1630 | } |
51e29401 | 1631 | |
3c6e6fbf ZW |
1632 | /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL. |
1633 | Returns true if the caller should proceed to merge the two, false | |
1634 | if OLDDECL should simply be discarded. As a side effect, issues | |
1635 | all necessary diagnostics for invalid or poor-style combinations. | |
1636 | If it returns true, writes the types of NEWDECL and OLDDECL to | |
1637 | *NEWTYPEP and *OLDTYPEP - these may have been adjusted from | |
1638 | TREE_TYPE (NEWDECL, OLDDECL) respectively. */ | |
1639 | ||
1640 | static bool | |
1641 | diagnose_mismatched_decls (tree newdecl, tree olddecl, | |
1642 | tree *newtypep, tree *oldtypep) | |
1643 | { | |
1644 | tree newtype, oldtype; | |
1645 | bool pedwarned = false; | |
1646 | bool warned = false; | |
f8f5c4b3 | 1647 | bool retval = true; |
3c6e6fbf | 1648 | |
6663ee3b EC |
1649 | #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \ |
1650 | && DECL_EXTERNAL (DECL)) | |
1651 | ||
3c6e6fbf ZW |
1652 | /* If we have error_mark_node for either decl or type, just discard |
1653 | the previous decl - we're in an error cascade already. */ | |
1654 | if (olddecl == error_mark_node || newdecl == error_mark_node) | |
1655 | return false; | |
bc298aa7 ZW |
1656 | *oldtypep = oldtype = TREE_TYPE (olddecl); |
1657 | *newtypep = newtype = TREE_TYPE (newdecl); | |
3c6e6fbf ZW |
1658 | if (oldtype == error_mark_node || newtype == error_mark_node) |
1659 | return false; | |
1660 | ||
1661 | /* Two different categories of symbol altogether. This is an error | |
1662 | unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */ | |
51e29401 RS |
1663 | if (TREE_CODE (olddecl) != TREE_CODE (newdecl)) |
1664 | { | |
f75fbaf7 ZW |
1665 | if (!(TREE_CODE (olddecl) == FUNCTION_DECL |
1666 | && DECL_BUILT_IN (olddecl) | |
1667 | && !C_DECL_DECLARED_BUILTIN (olddecl))) | |
51e29401 | 1668 | { |
dee15844 | 1669 | error ("%q+D redeclared as different kind of symbol", newdecl); |
71205d17 | 1670 | locate_old_decl (olddecl); |
3c6e6fbf ZW |
1671 | } |
1672 | else if (TREE_PUBLIC (newdecl)) | |
dee15844 JM |
1673 | warning (0, "built-in function %q+D declared as non-function", |
1674 | newdecl); | |
44c21c7f | 1675 | else |
dee15844 JM |
1676 | warning (OPT_Wshadow, "declaration of %q+D shadows " |
1677 | "a built-in function", newdecl); | |
3c6e6fbf ZW |
1678 | return false; |
1679 | } | |
1680 | ||
085e33aa JM |
1681 | /* Enumerators have no linkage, so may only be declared once in a |
1682 | given scope. */ | |
1683 | if (TREE_CODE (olddecl) == CONST_DECL) | |
1684 | { | |
dee15844 | 1685 | error ("redeclaration of enumerator %q+D", newdecl); |
71205d17 | 1686 | locate_old_decl (olddecl); |
085e33aa JM |
1687 | return false; |
1688 | } | |
1689 | ||
132da1a5 | 1690 | if (!comptypes (oldtype, newtype)) |
3c6e6fbf | 1691 | { |
a6f78652 | 1692 | if (TREE_CODE (olddecl) == FUNCTION_DECL |
f75fbaf7 | 1693 | && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl)) |
3c6e6fbf ZW |
1694 | { |
1695 | /* Accept harmless mismatch in function types. | |
1696 | This is for the ffs and fprintf builtins. */ | |
1697 | tree trytype = match_builtin_function_types (newtype, oldtype); | |
1698 | ||
132da1a5 | 1699 | if (trytype && comptypes (newtype, trytype)) |
bc298aa7 | 1700 | *oldtypep = oldtype = trytype; |
3c6e6fbf | 1701 | else |
51e29401 | 1702 | { |
3c6e6fbf ZW |
1703 | /* If types don't match for a built-in, throw away the |
1704 | built-in. No point in calling locate_old_decl here, it | |
9ac97460 | 1705 | won't print anything. */ |
dee15844 JM |
1706 | warning (0, "conflicting types for built-in function %q+D", |
1707 | newdecl); | |
3c6e6fbf | 1708 | return false; |
51e29401 | 1709 | } |
3c6e6fbf ZW |
1710 | } |
1711 | else if (TREE_CODE (olddecl) == FUNCTION_DECL | |
3c20847b | 1712 | && DECL_IS_BUILTIN (olddecl)) |
3c6e6fbf ZW |
1713 | { |
1714 | /* A conflicting function declaration for a predeclared | |
1715 | function that isn't actually built in. Objective C uses | |
1716 | these. The new declaration silently overrides everything | |
1717 | but the volatility (i.e. noreturn) indication. See also | |
1718 | below. FIXME: Make Objective C use normal builtins. */ | |
1719 | TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl); | |
1720 | return false; | |
1721 | } | |
1722 | /* Permit void foo (...) to match int foo (...) if the latter is | |
1723 | the definition and implicit int was used. See | |
1724 | c-torture/compile/920625-2.c. */ | |
1725 | else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) | |
1726 | && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node | |
1727 | && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node | |
12869142 | 1728 | && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl)) |
3c6e6fbf | 1729 | { |
509c9d60 MLI |
1730 | pedwarned = pedwarn (input_location, 0, |
1731 | "conflicting types for %q+D", newdecl); | |
3c6e6fbf | 1732 | /* Make sure we keep void as the return type. */ |
bc298aa7 | 1733 | TREE_TYPE (newdecl) = *newtypep = newtype = oldtype; |
3c6e6fbf | 1734 | C_FUNCTION_IMPLICIT_INT (newdecl) = 0; |
51e29401 | 1735 | } |
12869142 DJ |
1736 | /* Permit void foo (...) to match an earlier call to foo (...) with |
1737 | no declared type (thus, implicitly int). */ | |
1738 | else if (TREE_CODE (newdecl) == FUNCTION_DECL | |
1739 | && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node | |
1740 | && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node | |
1741 | && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl)) | |
1742 | { | |
509c9d60 MLI |
1743 | pedwarned = pedwarn (input_location, 0, |
1744 | "conflicting types for %q+D", newdecl); | |
12869142 DJ |
1745 | /* Make sure we keep void as the return type. */ |
1746 | TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype; | |
12869142 | 1747 | } |
51e29401 RS |
1748 | else |
1749 | { | |
36c5e70a BE |
1750 | int new_quals = TYPE_QUALS (newtype); |
1751 | int old_quals = TYPE_QUALS (oldtype); | |
1752 | ||
1753 | if (new_quals != old_quals) | |
1754 | { | |
1755 | addr_space_t new_addr = DECODE_QUAL_ADDR_SPACE (new_quals); | |
1756 | addr_space_t old_addr = DECODE_QUAL_ADDR_SPACE (old_quals); | |
1757 | if (new_addr != old_addr) | |
1758 | { | |
1759 | if (ADDR_SPACE_GENERIC_P (new_addr)) | |
1760 | error ("conflicting named address spaces (generic vs %s) " | |
1761 | "for %q+D", | |
1762 | c_addr_space_name (old_addr), newdecl); | |
1763 | else if (ADDR_SPACE_GENERIC_P (old_addr)) | |
1764 | error ("conflicting named address spaces (%s vs generic) " | |
1765 | "for %q+D", | |
1766 | c_addr_space_name (new_addr), newdecl); | |
1767 | else | |
1768 | error ("conflicting named address spaces (%s vs %s) " | |
1769 | "for %q+D", | |
1770 | c_addr_space_name (new_addr), | |
1771 | c_addr_space_name (old_addr), | |
1772 | newdecl); | |
1773 | } | |
1774 | ||
1775 | if (CLEAR_QUAL_ADDR_SPACE (new_quals) | |
1776 | != CLEAR_QUAL_ADDR_SPACE (old_quals)) | |
1777 | error ("conflicting type qualifiers for %q+D", newdecl); | |
1778 | } | |
118a3a8b | 1779 | else |
dee15844 | 1780 | error ("conflicting types for %q+D", newdecl); |
3c6e6fbf | 1781 | diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype); |
71205d17 | 1782 | locate_old_decl (olddecl); |
3c6e6fbf | 1783 | return false; |
51e29401 | 1784 | } |
51e29401 RS |
1785 | } |
1786 | ||
3c6e6fbf ZW |
1787 | /* Redeclaration of a type is a constraint violation (6.7.2.3p1), |
1788 | but silently ignore the redeclaration if either is in a system | |
dc5027f4 JM |
1789 | header. (Conflicting redeclarations were handled above.) This |
1790 | is allowed for C1X if the types are the same, not just | |
1791 | compatible. */ | |
3c6e6fbf | 1792 | if (TREE_CODE (newdecl) == TYPE_DECL) |
339a28b9 | 1793 | { |
dc5027f4 JM |
1794 | bool types_different = false; |
1795 | int comptypes_result; | |
1796 | ||
1797 | comptypes_result | |
1798 | = comptypes_check_different_types (oldtype, newtype, &types_different); | |
1799 | ||
1800 | if (comptypes_result != 1 || types_different) | |
1801 | { | |
1802 | error ("redefinition of typedef %q+D with different type", newdecl); | |
1803 | locate_old_decl (olddecl); | |
1804 | return false; | |
1805 | } | |
1806 | ||
df0ed6c5 RAE |
1807 | if (DECL_IN_SYSTEM_HEADER (newdecl) |
1808 | || DECL_IN_SYSTEM_HEADER (olddecl) | |
1809 | || TREE_NO_WARNING (newdecl) | |
1810 | || TREE_NO_WARNING (olddecl)) | |
a1105617 | 1811 | return true; /* Allow OLDDECL to continue in use. */ |
118a3a8b | 1812 | |
dc5027f4 JM |
1813 | if (pedantic && !flag_isoc1x) |
1814 | { | |
1815 | pedwarn (input_location, OPT_pedantic, | |
1816 | "redefinition of typedef %q+D", newdecl); | |
1817 | locate_old_decl (olddecl); | |
1818 | } | |
1819 | else if (variably_modified_type_p (newtype, NULL)) | |
1820 | { | |
1821 | /* Whether there is a constraint violation for the types not | |
1822 | being the same cannot be determined at compile time; a | |
1823 | warning that there may be one at runtime is considered | |
1824 | appropriate (WG14 reflector message 11743, 8 May 2009). */ | |
1825 | warning (0, "redefinition of typedef %q+D may be a constraint " | |
1826 | "violation at runtime", newdecl); | |
1827 | locate_old_decl (olddecl); | |
1828 | } | |
1829 | ||
1830 | return true; | |
339a28b9 | 1831 | } |
51e29401 | 1832 | |
3c6e6fbf ZW |
1833 | /* Function declarations can either be 'static' or 'extern' (no |
1834 | qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore | |
71113fcd GK |
1835 | can never conflict with each other on account of linkage |
1836 | (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but | |
1837 | gnu89 mode permits two definitions if one is 'extern inline' and | |
1838 | one is not. The non- extern-inline definition supersedes the | |
1839 | extern-inline definition. */ | |
6663ee3b | 1840 | |
3c6e6fbf | 1841 | else if (TREE_CODE (newdecl) == FUNCTION_DECL) |
51e29401 | 1842 | { |
04b8f97f ZW |
1843 | /* If you declare a built-in function name as static, or |
1844 | define the built-in with an old-style definition (so we | |
1845 | can't validate the argument list) the built-in definition is | |
1846 | overridden, but optionally warn this was a bad choice of name. */ | |
1847 | if (DECL_BUILT_IN (olddecl) | |
f75fbaf7 | 1848 | && !C_DECL_DECLARED_BUILTIN (olddecl) |
04b8f97f ZW |
1849 | && (!TREE_PUBLIC (newdecl) |
1850 | || (DECL_INITIAL (newdecl) | |
1851 | && !TYPE_ARG_TYPES (TREE_TYPE (newdecl))))) | |
51e29401 | 1852 | { |
dee15844 JM |
1853 | warning (OPT_Wshadow, "declaration of %q+D shadows " |
1854 | "a built-in function", newdecl); | |
51e29401 | 1855 | /* Discard the old built-in function. */ |
3c6e6fbf | 1856 | return false; |
51e29401 | 1857 | } |
118a3a8b | 1858 | |
3c6e6fbf | 1859 | if (DECL_INITIAL (newdecl)) |
4c41bbfa | 1860 | { |
f8f5c4b3 | 1861 | if (DECL_INITIAL (olddecl)) |
6907ddd3 | 1862 | { |
6663ee3b | 1863 | /* If both decls are in the same TU and the new declaration |
619519c8 | 1864 | isn't overriding an extern inline reject the new decl. |
71113fcd GK |
1865 | In c99, no overriding is allowed in the same translation |
1866 | unit. */ | |
1867 | if ((!DECL_EXTERN_INLINE (olddecl) | |
1868 | || DECL_EXTERN_INLINE (newdecl) | |
da1c7394 | 1869 | || (!flag_gnu89_inline |
4eb7fd83 JJ |
1870 | && (!DECL_DECLARED_INLINE_P (olddecl) |
1871 | || !lookup_attribute ("gnu_inline", | |
1872 | DECL_ATTRIBUTES (olddecl))) | |
1873 | && (!DECL_DECLARED_INLINE_P (newdecl) | |
1874 | || !lookup_attribute ("gnu_inline", | |
1875 | DECL_ATTRIBUTES (newdecl)))) | |
4eb7fd83 | 1876 | ) |
f8f5c4b3 AP |
1877 | && same_translation_unit_p (newdecl, olddecl)) |
1878 | { | |
dee15844 | 1879 | error ("redefinition of %q+D", newdecl); |
71205d17 | 1880 | locate_old_decl (olddecl); |
f8f5c4b3 AP |
1881 | return false; |
1882 | } | |
6663ee3b | 1883 | } |
4c41bbfa | 1884 | } |
3c6e6fbf ZW |
1885 | /* If we have a prototype after an old-style function definition, |
1886 | the argument types must be checked specially. */ | |
1887 | else if (DECL_INITIAL (olddecl) | |
1888 | && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype) | |
1889 | && TYPE_ACTUAL_ARG_TYPES (oldtype) | |
1890 | && !validate_proto_after_old_defn (newdecl, newtype, oldtype)) | |
52b6a22f | 1891 | { |
71205d17 | 1892 | locate_old_decl (olddecl); |
3c6e6fbf | 1893 | return false; |
52b6a22f | 1894 | } |
9aaabf8a ZW |
1895 | /* A non-static declaration (even an "extern") followed by a |
1896 | static declaration is undefined behavior per C99 6.2.2p3-5,7. | |
1897 | The same is true for a static forward declaration at block | |
1898 | scope followed by a non-static declaration/definition at file | |
1899 | scope. Static followed by non-static at the same scope is | |
1900 | not undefined behavior, and is the most convenient way to get | |
1901 | some effects (see e.g. what unwind-dw2-fde-glibc.c does to | |
1902 | the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but | |
8c27b7d4 | 1903 | we do diagnose it if -Wtraditional. */ |
3c6e6fbf | 1904 | if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl)) |
51e29401 | 1905 | { |
9aaabf8a ZW |
1906 | /* Two exceptions to the rule. If olddecl is an extern |
1907 | inline, or a predeclared function that isn't actually | |
1908 | built in, newdecl silently overrides olddecl. The latter | |
1909 | occur only in Objective C; see also above. (FIXME: Make | |
1910 | Objective C use normal builtins.) */ | |
1911 | if (!DECL_IS_BUILTIN (olddecl) | |
6663ee3b | 1912 | && !DECL_EXTERN_INLINE (olddecl)) |
3c6e6fbf | 1913 | { |
dee15844 JM |
1914 | error ("static declaration of %q+D follows " |
1915 | "non-static declaration", newdecl); | |
71205d17 | 1916 | locate_old_decl (olddecl); |
3c6e6fbf | 1917 | } |
9aaabf8a | 1918 | return false; |
51e29401 | 1919 | } |
9aaabf8a | 1920 | else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl)) |
e841f997 | 1921 | { |
9aaabf8a ZW |
1922 | if (DECL_CONTEXT (olddecl)) |
1923 | { | |
dee15844 JM |
1924 | error ("non-static declaration of %q+D follows " |
1925 | "static declaration", newdecl); | |
71205d17 | 1926 | locate_old_decl (olddecl); |
9aaabf8a ZW |
1927 | return false; |
1928 | } | |
1929 | else if (warn_traditional) | |
1930 | { | |
b8698a0f | 1931 | warned |= warning (OPT_Wtraditional, |
71205d17 MLI |
1932 | "non-static declaration of %q+D " |
1933 | "follows static declaration", newdecl); | |
9aaabf8a | 1934 | } |
e841f997 | 1935 | } |
4eb7fd83 JJ |
1936 | |
1937 | /* Make sure gnu_inline attribute is either not present, or | |
1938 | present on all inline decls. */ | |
1939 | if (DECL_DECLARED_INLINE_P (olddecl) | |
1940 | && DECL_DECLARED_INLINE_P (newdecl)) | |
1941 | { | |
1942 | bool newa = lookup_attribute ("gnu_inline", | |
1943 | DECL_ATTRIBUTES (newdecl)) != NULL; | |
1944 | bool olda = lookup_attribute ("gnu_inline", | |
1945 | DECL_ATTRIBUTES (olddecl)) != NULL; | |
1946 | if (newa != olda) | |
1947 | { | |
c5d75364 MLI |
1948 | error_at (input_location, "%<gnu_inline%> attribute present on %q+D", |
1949 | newa ? newdecl : olddecl); | |
1950 | error_at (DECL_SOURCE_LOCATION (newa ? olddecl : newdecl), | |
1951 | "but not here"); | |
4eb7fd83 JJ |
1952 | } |
1953 | } | |
51e29401 | 1954 | } |
3c6e6fbf | 1955 | else if (TREE_CODE (newdecl) == VAR_DECL) |
339a28b9 | 1956 | { |
3c6e6fbf ZW |
1957 | /* Only variables can be thread-local, and all declarations must |
1958 | agree on this property. */ | |
953ff289 DN |
1959 | if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl)) |
1960 | { | |
1961 | /* Nothing to check. Since OLDDECL is marked threadprivate | |
1962 | and NEWDECL does not have a thread-local attribute, we | |
1963 | will merge the threadprivate attribute into NEWDECL. */ | |
1964 | ; | |
1965 | } | |
1966 | else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)) | |
51e29401 | 1967 | { |
c2f7fa15 | 1968 | if (DECL_THREAD_LOCAL_P (newdecl)) |
dee15844 JM |
1969 | error ("thread-local declaration of %q+D follows " |
1970 | "non-thread-local declaration", newdecl); | |
3c6e6fbf | 1971 | else |
dee15844 JM |
1972 | error ("non-thread-local declaration of %q+D follows " |
1973 | "thread-local declaration", newdecl); | |
51e29401 | 1974 | |
71205d17 | 1975 | locate_old_decl (olddecl); |
3c6e6fbf ZW |
1976 | return false; |
1977 | } | |
51e29401 | 1978 | |
3c6e6fbf ZW |
1979 | /* Multiple initialized definitions are not allowed (6.9p3,5). */ |
1980 | if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl)) | |
1981 | { | |
dee15844 | 1982 | error ("redefinition of %q+D", newdecl); |
71205d17 | 1983 | locate_old_decl (olddecl); |
3c6e6fbf ZW |
1984 | return false; |
1985 | } | |
1986 | ||
9aaabf8a ZW |
1987 | /* Objects declared at file scope: if the first declaration had |
1988 | external linkage (even if it was an external reference) the | |
1989 | second must have external linkage as well, or the behavior is | |
1990 | undefined. If the first declaration had internal linkage, then | |
1991 | the second must too, or else be an external reference (in which | |
1992 | case the composite declaration still has internal linkage). | |
1993 | As for function declarations, we warn about the static-then- | |
1994 | extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */ | |
1995 | if (DECL_FILE_SCOPE_P (newdecl) | |
1996 | && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl)) | |
3c6e6fbf | 1997 | { |
9aaabf8a ZW |
1998 | if (DECL_EXTERNAL (newdecl)) |
1999 | { | |
558d1f81 JM |
2000 | if (!DECL_FILE_SCOPE_P (olddecl)) |
2001 | { | |
dee15844 JM |
2002 | error ("extern declaration of %q+D follows " |
2003 | "declaration with no linkage", newdecl); | |
71205d17 | 2004 | locate_old_decl (olddecl); |
558d1f81 JM |
2005 | return false; |
2006 | } | |
2007 | else if (warn_traditional) | |
9aaabf8a | 2008 | { |
b8698a0f | 2009 | warned |= warning (OPT_Wtraditional, |
71205d17 MLI |
2010 | "non-static declaration of %q+D " |
2011 | "follows static declaration", newdecl); | |
9aaabf8a ZW |
2012 | } |
2013 | } | |
2014 | else | |
3c6e6fbf ZW |
2015 | { |
2016 | if (TREE_PUBLIC (newdecl)) | |
dee15844 JM |
2017 | error ("non-static declaration of %q+D follows " |
2018 | "static declaration", newdecl); | |
3c6e6fbf | 2019 | else |
dee15844 JM |
2020 | error ("static declaration of %q+D follows " |
2021 | "non-static declaration", newdecl); | |
3c6e6fbf | 2022 | |
71205d17 | 2023 | locate_old_decl (olddecl); |
3c6e6fbf | 2024 | return false; |
51e29401 RS |
2025 | } |
2026 | } | |
3c6e6fbf ZW |
2027 | /* Two objects with the same name declared at the same block |
2028 | scope must both be external references (6.7p3). */ | |
558d1f81 | 2029 | else if (!DECL_FILE_SCOPE_P (newdecl)) |
3c6e6fbf ZW |
2030 | { |
2031 | if (DECL_EXTERNAL (newdecl)) | |
0b410f0b JM |
2032 | { |
2033 | /* Extern with initializer at block scope, which will | |
2034 | already have received an error. */ | |
2035 | } | |
3c6e6fbf | 2036 | else if (DECL_EXTERNAL (olddecl)) |
0b410f0b | 2037 | { |
dee15844 JM |
2038 | error ("declaration of %q+D with no linkage follows " |
2039 | "extern declaration", newdecl); | |
71205d17 | 2040 | locate_old_decl (olddecl); |
0b410f0b | 2041 | } |
3c6e6fbf | 2042 | else |
0b410f0b | 2043 | { |
dee15844 | 2044 | error ("redeclaration of %q+D with no linkage", newdecl); |
71205d17 | 2045 | locate_old_decl (olddecl); |
0b410f0b | 2046 | } |
ecf92f82 | 2047 | |
3c6e6fbf ZW |
2048 | return false; |
2049 | } | |
7a5d2eb8 ILT |
2050 | |
2051 | /* C++ does not permit a decl to appear multiple times at file | |
2052 | scope. */ | |
2053 | if (warn_cxx_compat | |
2054 | && DECL_FILE_SCOPE_P (newdecl) | |
2055 | && !DECL_EXTERNAL (newdecl) | |
2056 | && !DECL_EXTERNAL (olddecl)) | |
2057 | warned |= warning_at (DECL_SOURCE_LOCATION (newdecl), | |
2058 | OPT_Wc___compat, | |
2059 | ("duplicate declaration of %qD is " | |
2060 | "invalid in C++"), | |
2061 | newdecl); | |
1ae0ccb6 | 2062 | } |
3c6e6fbf ZW |
2063 | |
2064 | /* warnings */ | |
d7afec4b | 2065 | /* All decls must agree on a visibility. */ |
c22cacf3 | 2066 | if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS) |
820cc88f | 2067 | && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl) |
3c6e6fbf | 2068 | && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl)) |
1ae0ccb6 | 2069 | { |
71205d17 MLI |
2070 | warned |= warning (0, "redeclaration of %q+D with different visibility " |
2071 | "(old visibility preserved)", newdecl); | |
1ae0ccb6 | 2072 | } |
3c6e6fbf ZW |
2073 | |
2074 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
51e29401 | 2075 | { |
3c6e6fbf ZW |
2076 | /* Diagnose inline __attribute__ ((noinline)) which is silly. */ |
2077 | if (DECL_DECLARED_INLINE_P (newdecl) | |
2078 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl))) | |
51e29401 | 2079 | { |
b8698a0f | 2080 | warned |= warning (OPT_Wattributes, |
71205d17 MLI |
2081 | "inline declaration of %qD follows " |
2082 | "declaration with attribute noinline", newdecl); | |
51e29401 | 2083 | } |
3c6e6fbf ZW |
2084 | else if (DECL_DECLARED_INLINE_P (olddecl) |
2085 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl))) | |
4b4e3407 | 2086 | { |
b8698a0f | 2087 | warned |= warning (OPT_Wattributes, |
71205d17 MLI |
2088 | "declaration of %q+D with attribute " |
2089 | "noinline follows inline declaration ", newdecl); | |
4b4e3407 | 2090 | } |
3c6e6fbf | 2091 | } |
3205a71e | 2092 | else /* PARM_DECL, VAR_DECL */ |
3c6e6fbf | 2093 | { |
f75fbaf7 ZW |
2094 | /* Redeclaration of a parameter is a constraint violation (this is |
2095 | not explicitly stated, but follows from C99 6.7p3 [no more than | |
2096 | one declaration of the same identifier with no linkage in the | |
2097 | same scope, except type tags] and 6.2.2p6 [parameters have no | |
2098 | linkage]). We must check for a forward parameter declaration, | |
2099 | indicated by TREE_ASM_WRITTEN on the old declaration - this is | |
2100 | an extension, the mandatory diagnostic for which is handled by | |
2101 | mark_forward_parm_decls. */ | |
2102 | ||
3205a71e ZW |
2103 | if (TREE_CODE (newdecl) == PARM_DECL |
2104 | && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl))) | |
2105 | { | |
dee15844 | 2106 | error ("redefinition of parameter %q+D", newdecl); |
71205d17 | 2107 | locate_old_decl (olddecl); |
3205a71e ZW |
2108 | return false; |
2109 | } | |
51e29401 RS |
2110 | } |
2111 | ||
3c6e6fbf ZW |
2112 | /* Optional warning for completely redundant decls. */ |
2113 | if (!warned && !pedwarned | |
2114 | && warn_redundant_decls | |
2115 | /* Don't warn about a function declaration followed by a | |
2116 | definition. */ | |
3205a71e ZW |
2117 | && !(TREE_CODE (newdecl) == FUNCTION_DECL |
2118 | && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)) | |
8c27b7d4 | 2119 | /* Don't warn about redundant redeclarations of builtins. */ |
c5e36c09 ZW |
2120 | && !(TREE_CODE (newdecl) == FUNCTION_DECL |
2121 | && !DECL_BUILT_IN (newdecl) | |
2122 | && DECL_BUILT_IN (olddecl) | |
2123 | && !C_DECL_DECLARED_BUILTIN (olddecl)) | |
3205a71e ZW |
2124 | /* Don't warn about an extern followed by a definition. */ |
2125 | && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl)) | |
2126 | /* Don't warn about forward parameter decls. */ | |
2127 | && !(TREE_CODE (newdecl) == PARM_DECL | |
52d09157 CR |
2128 | && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)) |
2129 | /* Don't warn about a variable definition following a declaration. */ | |
2130 | && !(TREE_CODE (newdecl) == VAR_DECL | |
2131 | && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))) | |
27f427f8 | 2132 | { |
71205d17 MLI |
2133 | warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D", |
2134 | newdecl); | |
27f427f8 RS |
2135 | } |
2136 | ||
71205d17 | 2137 | /* Report location of previous decl/defn. */ |
3c6e6fbf | 2138 | if (warned || pedwarned) |
71205d17 | 2139 | locate_old_decl (olddecl); |
664b4b1e | 2140 | |
6663ee3b EC |
2141 | #undef DECL_EXTERN_INLINE |
2142 | ||
f8f5c4b3 | 2143 | return retval; |
3c6e6fbf | 2144 | } |
51e29401 | 2145 | |
3c6e6fbf ZW |
2146 | /* Subroutine of duplicate_decls. NEWDECL has been found to be |
2147 | consistent with OLDDECL, but carries new information. Merge the | |
1ef82ef2 | 2148 | new information into OLDDECL. This function issues no |
3c6e6fbf ZW |
2149 | diagnostics. */ |
2150 | ||
2151 | static void | |
1ef82ef2 | 2152 | merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype) |
3c6e6fbf | 2153 | { |
71113fcd GK |
2154 | bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL |
2155 | && DECL_INITIAL (newdecl) != 0); | |
2156 | bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL | |
2157 | && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0); | |
2158 | bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL | |
2159 | && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0); | |
2160 | bool extern_changed = false; | |
3c6e6fbf | 2161 | |
f75fbaf7 ZW |
2162 | /* For real parm decl following a forward decl, rechain the old decl |
2163 | in its new location and clear TREE_ASM_WRITTEN (it's not a | |
2164 | forward decl anymore). */ | |
3c6e6fbf | 2165 | if (TREE_CODE (newdecl) == PARM_DECL |
3f75a254 | 2166 | && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)) |
51e29401 | 2167 | { |
f75fbaf7 ZW |
2168 | struct c_binding *b, **here; |
2169 | ||
2170 | for (here = ¤t_scope->bindings; *here; here = &(*here)->prev) | |
2171 | if ((*here)->decl == olddecl) | |
2172 | goto found; | |
366de0ce | 2173 | gcc_unreachable (); |
f75fbaf7 ZW |
2174 | |
2175 | found: | |
2176 | b = *here; | |
2177 | *here = b->prev; | |
2178 | b->prev = current_scope->bindings; | |
2179 | current_scope->bindings = b; | |
2180 | ||
3c6e6fbf | 2181 | TREE_ASM_WRITTEN (olddecl) = 0; |
3c6e6fbf ZW |
2182 | } |
2183 | ||
2184 | DECL_ATTRIBUTES (newdecl) | |
5fd9b178 | 2185 | = targetm.merge_decl_attributes (olddecl, newdecl); |
bf44f7de | 2186 | |
3c6e6fbf | 2187 | /* Merge the data types specified in the two decls. */ |
1ef82ef2 ZW |
2188 | TREE_TYPE (newdecl) |
2189 | = TREE_TYPE (olddecl) | |
10bc1b1b | 2190 | = composite_type (newtype, oldtype); |
51e29401 | 2191 | |
3c6e6fbf | 2192 | /* Lay the type out, unless already done. */ |
2587f865 | 2193 | if (!comptypes (oldtype, TREE_TYPE (newdecl))) |
3c6e6fbf ZW |
2194 | { |
2195 | if (TREE_TYPE (newdecl) != error_mark_node) | |
2196 | layout_type (TREE_TYPE (newdecl)); | |
2197 | if (TREE_CODE (newdecl) != FUNCTION_DECL | |
2198 | && TREE_CODE (newdecl) != TYPE_DECL | |
2199 | && TREE_CODE (newdecl) != CONST_DECL) | |
2200 | layout_decl (newdecl, 0); | |
2201 | } | |
2202 | else | |
2203 | { | |
2204 | /* Since the type is OLDDECL's, make OLDDECL's size go with. */ | |
2205 | DECL_SIZE (newdecl) = DECL_SIZE (olddecl); | |
2206 | DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl); | |
2207 | DECL_MODE (newdecl) = DECL_MODE (olddecl); | |
837edd5f GK |
2208 | if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl)) |
2209 | { | |
2210 | DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl); | |
8220334a | 2211 | DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl); |
837edd5f | 2212 | } |
3c6e6fbf | 2213 | } |
fc542d3c | 2214 | |
9a60b229 JJ |
2215 | /* Keep the old rtl since we can safely use it. */ |
2216 | if (HAS_RTL_P (olddecl)) | |
2217 | COPY_DECL_RTL (olddecl, newdecl); | |
17aec3eb | 2218 | |
3c6e6fbf ZW |
2219 | /* Merge the type qualifiers. */ |
2220 | if (TREE_READONLY (newdecl)) | |
1ef82ef2 | 2221 | TREE_READONLY (olddecl) = 1; |
facef326 | 2222 | |
3c6e6fbf | 2223 | if (TREE_THIS_VOLATILE (newdecl)) |
ee9f69b4 | 2224 | TREE_THIS_VOLATILE (olddecl) = 1; |
3c6e6fbf | 2225 | |
302a2cc5 JM |
2226 | /* Merge deprecatedness. */ |
2227 | if (TREE_DEPRECATED (newdecl)) | |
2228 | TREE_DEPRECATED (olddecl) = 1; | |
2229 | ||
238fe3c5 RAE |
2230 | /* If a decl is in a system header and the other isn't, keep the one on the |
2231 | system header. Otherwise, keep source location of definition rather than | |
2232 | declaration and of prototype rather than non-prototype unless that | |
2233 | prototype is built-in. */ | |
2234 | if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS) | |
2235 | && DECL_IN_SYSTEM_HEADER (olddecl) | |
2236 | && !DECL_IN_SYSTEM_HEADER (newdecl) ) | |
aa14403d | 2237 | DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl); |
238fe3c5 RAE |
2238 | else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS) |
2239 | && DECL_IN_SYSTEM_HEADER (newdecl) | |
2240 | && !DECL_IN_SYSTEM_HEADER (olddecl)) | |
aa14403d | 2241 | DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl); |
238fe3c5 RAE |
2242 | else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0) |
2243 | || (old_is_prototype && !new_is_prototype | |
2244 | && !C_DECL_BUILTIN_PROTOTYPE (olddecl))) | |
3c6e6fbf ZW |
2245 | DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl); |
2246 | ||
3c6e6fbf | 2247 | /* Merge the initialization information. */ |
1ef82ef2 | 2248 | if (DECL_INITIAL (newdecl) == 0) |
3c6e6fbf ZW |
2249 | DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl); |
2250 | ||
953ff289 DN |
2251 | /* Merge the threadprivate attribute. */ |
2252 | if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl)) | |
2253 | { | |
2254 | DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl); | |
2255 | C_DECL_THREADPRIVATE_P (newdecl) = 1; | |
2256 | } | |
2257 | ||
fbbc17c7 MS |
2258 | if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)) |
2259 | { | |
fbbc17c7 MS |
2260 | /* Merge the section attribute. |
2261 | We want to issue an error if the sections conflict but that | |
2262 | must be done later in decl_attributes since we are called | |
2263 | before attributes are assigned. */ | |
2264 | if (DECL_SECTION_NAME (newdecl) == NULL_TREE) | |
2265 | DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl); | |
2266 | ||
2267 | /* Copy the assembler name. | |
2268 | Currently, it can only be defined in the prototype. */ | |
2269 | COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl); | |
2270 | ||
2271 | /* Use visibility of whichever declaration had it specified */ | |
2272 | if (DECL_VISIBILITY_SPECIFIED (olddecl)) | |
2273 | { | |
2274 | DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl); | |
2275 | DECL_VISIBILITY_SPECIFIED (newdecl) = 1; | |
2276 | } | |
2277 | ||
2278 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2279 | { | |
2280 | DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl); | |
2281 | DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl); | |
2282 | DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl); | |
2283 | DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl) | |
2284 | |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl); | |
2285 | TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl); | |
fbbc17c7 | 2286 | DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl); |
1ea193c2 | 2287 | DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl); |
becfd6e5 KZ |
2288 | TREE_READONLY (newdecl) |= TREE_READONLY (olddecl); |
2289 | DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl); | |
fbbc17c7 MS |
2290 | DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl); |
2291 | } | |
2292 | ||
2293 | /* Merge the storage class information. */ | |
2294 | merge_weak (newdecl, olddecl); | |
2295 | ||
2296 | /* For functions, static overrides non-static. */ | |
2297 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2298 | { | |
2299 | TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl); | |
2300 | /* This is since we don't automatically | |
2301 | copy the attributes of NEWDECL into OLDDECL. */ | |
2302 | TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl); | |
2303 | /* If this clears `static', clear it in the identifier too. */ | |
2304 | if (!TREE_PUBLIC (olddecl)) | |
2305 | TREE_PUBLIC (DECL_NAME (olddecl)) = 0; | |
2306 | } | |
2307 | } | |
2308 | ||
4eb7fd83 JJ |
2309 | /* In c99, 'extern' declaration before (or after) 'inline' means this |
2310 | function is not DECL_EXTERNAL, unless 'gnu_inline' attribute | |
2311 | is present. */ | |
2312 | if (TREE_CODE (newdecl) == FUNCTION_DECL | |
da1c7394 | 2313 | && !flag_gnu89_inline |
4eb7fd83 JJ |
2314 | && (DECL_DECLARED_INLINE_P (newdecl) |
2315 | || DECL_DECLARED_INLINE_P (olddecl)) | |
2316 | && (!DECL_DECLARED_INLINE_P (newdecl) | |
2317 | || !DECL_DECLARED_INLINE_P (olddecl) | |
2318 | || !DECL_EXTERNAL (olddecl)) | |
2319 | && DECL_EXTERNAL (newdecl) | |
6cf59865 | 2320 | && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl)) |
74b0ec7c | 2321 | && !current_function_decl) |
4eb7fd83 | 2322 | DECL_EXTERNAL (newdecl) = 0; |
71113fcd | 2323 | |
fbbc17c7 MS |
2324 | if (DECL_EXTERNAL (newdecl)) |
2325 | { | |
2326 | TREE_STATIC (newdecl) = TREE_STATIC (olddecl); | |
2327 | DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl); | |
2328 | ||
2329 | /* An extern decl does not override previous storage class. */ | |
2330 | TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl); | |
2331 | if (!DECL_EXTERNAL (newdecl)) | |
2332 | { | |
2333 | DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl); | |
2334 | DECL_COMMON (newdecl) = DECL_COMMON (olddecl); | |
2335 | } | |
2336 | } | |
2337 | else | |
2338 | { | |
2339 | TREE_STATIC (olddecl) = TREE_STATIC (newdecl); | |
2340 | TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl); | |
2341 | } | |
2342 | ||
2343 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2344 | { | |
2345 | /* If we're redefining a function previously defined as extern | |
2346 | inline, make sure we emit debug info for the inline before we | |
2347 | throw it away, in case it was inlined into a function that | |
2348 | hasn't been written out yet. */ | |
2349 | if (new_is_definition && DECL_INITIAL (olddecl)) | |
500b9ca1 JJ |
2350 | /* The new defn must not be inline. */ |
2351 | DECL_UNINLINABLE (newdecl) = 1; | |
fbbc17c7 MS |
2352 | else |
2353 | { | |
2354 | /* If either decl says `inline', this fn is inline, unless | |
2355 | its definition was passed already. */ | |
2356 | if (DECL_DECLARED_INLINE_P (newdecl) | |
2357 | || DECL_DECLARED_INLINE_P (olddecl)) | |
2358 | DECL_DECLARED_INLINE_P (newdecl) = 1; | |
2359 | ||
2360 | DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl) | |
2361 | = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)); | |
c536a6a7 RG |
2362 | |
2363 | DECL_DISREGARD_INLINE_LIMITS (newdecl) | |
2364 | = DECL_DISREGARD_INLINE_LIMITS (olddecl) | |
2365 | = (DECL_DISREGARD_INLINE_LIMITS (newdecl) | |
2366 | || DECL_DISREGARD_INLINE_LIMITS (olddecl)); | |
fbbc17c7 MS |
2367 | } |
2368 | ||
2369 | if (DECL_BUILT_IN (olddecl)) | |
2370 | { | |
2371 | /* If redeclaring a builtin function, it stays built in. | |
2372 | But it gets tagged as having been declared. */ | |
2373 | DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl); | |
2374 | DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl); | |
2375 | C_DECL_DECLARED_BUILTIN (newdecl) = 1; | |
2376 | if (new_is_prototype) | |
2377 | C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0; | |
2378 | else | |
2379 | C_DECL_BUILTIN_PROTOTYPE (newdecl) | |
2380 | = C_DECL_BUILTIN_PROTOTYPE (olddecl); | |
2381 | } | |
2382 | ||
ab442df7 MM |
2383 | /* Preserve function specific target and optimization options */ |
2384 | if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl) | |
2385 | && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl)) | |
2386 | DECL_FUNCTION_SPECIFIC_TARGET (newdecl) | |
2387 | = DECL_FUNCTION_SPECIFIC_TARGET (olddecl); | |
2388 | ||
2389 | if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl) | |
2390 | && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)) | |
2391 | DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl) | |
2392 | = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl); | |
2393 | ||
fbbc17c7 MS |
2394 | /* Also preserve various other info from the definition. */ |
2395 | if (!new_is_definition) | |
2396 | { | |
dcb6e951 | 2397 | tree t; |
fbbc17c7 MS |
2398 | DECL_RESULT (newdecl) = DECL_RESULT (olddecl); |
2399 | DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl); | |
2400 | DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl); | |
2401 | DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl); | |
dcb6e951 RAE |
2402 | DECL_ARGUMENTS (newdecl) = copy_list (DECL_ARGUMENTS (olddecl)); |
2403 | for (t = DECL_ARGUMENTS (newdecl); t ; t = TREE_CHAIN (t)) | |
2404 | DECL_CONTEXT (t) = newdecl; | |
fbbc17c7 | 2405 | |
54dfd46b JH |
2406 | /* See if we've got a function to instantiate from. */ |
2407 | if (DECL_SAVED_TREE (olddecl)) | |
2408 | DECL_ABSTRACT_ORIGIN (newdecl) | |
2409 | = DECL_ABSTRACT_ORIGIN (olddecl); | |
fbbc17c7 MS |
2410 | } |
2411 | } | |
2412 | ||
a35120a3 | 2413 | extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl); |
71113fcd | 2414 | |
a35120a3 L |
2415 | /* Merge the USED information. */ |
2416 | if (TREE_USED (olddecl)) | |
2417 | TREE_USED (newdecl) = 1; | |
2418 | else if (TREE_USED (newdecl)) | |
2419 | TREE_USED (olddecl) = 1; | |
ebfbbdc5 JJ |
2420 | if (TREE_CODE (olddecl) == VAR_DECL || TREE_CODE (olddecl) == PARM_DECL) |
2421 | DECL_READ_P (newdecl) |= DECL_READ_P (olddecl); | |
c387e067 MS |
2422 | if (DECL_PRESERVE_P (olddecl)) |
2423 | DECL_PRESERVE_P (newdecl) = 1; | |
2424 | else if (DECL_PRESERVE_P (newdecl)) | |
2425 | DECL_PRESERVE_P (olddecl) = 1; | |
e27fb29c | 2426 | |
fbbc17c7 | 2427 | /* Copy most of the decl-specific fields of NEWDECL into OLDDECL. |
f9417da1 RG |
2428 | But preserve OLDDECL's DECL_UID, DECL_CONTEXT and |
2429 | DECL_ARGUMENTS (if appropriate). */ | |
850cba29 | 2430 | { |
b3694847 | 2431 | unsigned olddecl_uid = DECL_UID (olddecl); |
9affb2c7 | 2432 | tree olddecl_context = DECL_CONTEXT (olddecl); |
dcb6e951 RAE |
2433 | tree olddecl_arguments = NULL; |
2434 | if (TREE_CODE (olddecl) == FUNCTION_DECL) | |
2435 | olddecl_arguments = DECL_ARGUMENTS (olddecl); | |
c22cacf3 | 2436 | |
da61dec9 JM |
2437 | memcpy ((char *) olddecl + sizeof (struct tree_common), |
2438 | (char *) newdecl + sizeof (struct tree_common), | |
820cc88f DB |
2439 | sizeof (struct tree_decl_common) - sizeof (struct tree_common)); |
2440 | switch (TREE_CODE (olddecl)) | |
2441 | { | |
726a989a | 2442 | case FUNCTION_DECL: |
820cc88f DB |
2443 | case FIELD_DECL: |
2444 | case VAR_DECL: | |
2445 | case PARM_DECL: | |
2446 | case LABEL_DECL: | |
2447 | case RESULT_DECL: | |
2448 | case CONST_DECL: | |
2449 | case TYPE_DECL: | |
820cc88f DB |
2450 | memcpy ((char *) olddecl + sizeof (struct tree_decl_common), |
2451 | (char *) newdecl + sizeof (struct tree_decl_common), | |
2452 | tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common)); | |
2453 | break; | |
2454 | ||
2455 | default: | |
c22cacf3 | 2456 | |
820cc88f DB |
2457 | memcpy ((char *) olddecl + sizeof (struct tree_decl_common), |
2458 | (char *) newdecl + sizeof (struct tree_decl_common), | |
2459 | sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)); | |
2460 | } | |
850cba29 | 2461 | DECL_UID (olddecl) = olddecl_uid; |
9affb2c7 | 2462 | DECL_CONTEXT (olddecl) = olddecl_context; |
dcb6e951 RAE |
2463 | if (TREE_CODE (olddecl) == FUNCTION_DECL) |
2464 | DECL_ARGUMENTS (olddecl) = olddecl_arguments; | |
850cba29 | 2465 | } |
51e29401 | 2466 | |
2306d91c RH |
2467 | /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl |
2468 | so that encode_section_info has a chance to look at the new decl | |
2469 | flags and attributes. */ | |
2470 | if (DECL_RTL_SET_P (olddecl) | |
2471 | && (TREE_CODE (olddecl) == FUNCTION_DECL | |
2472 | || (TREE_CODE (olddecl) == VAR_DECL | |
2473 | && TREE_STATIC (olddecl)))) | |
0e6df31e | 2474 | make_decl_rtl (olddecl); |
71113fcd GK |
2475 | |
2476 | /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL, | |
2477 | and the definition is coming from the old version, cgraph needs | |
2478 | to be called again. */ | |
f0c882ab | 2479 | if (extern_changed && !new_is_definition |
71113fcd | 2480 | && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl)) |
f0c882ab | 2481 | cgraph_mark_if_needed (olddecl); |
51e29401 RS |
2482 | } |
2483 | ||
3c6e6fbf ZW |
2484 | /* Handle when a new declaration NEWDECL has the same name as an old |
2485 | one OLDDECL in the same binding contour. Prints an error message | |
2486 | if appropriate. | |
2487 | ||
2488 | If safely possible, alter OLDDECL to look like NEWDECL, and return | |
1ef82ef2 | 2489 | true. Otherwise, return false. */ |
3c6e6fbf ZW |
2490 | |
2491 | static bool | |
1ef82ef2 | 2492 | duplicate_decls (tree newdecl, tree olddecl) |
3c6e6fbf | 2493 | { |
6de9cd9a | 2494 | tree newtype = NULL, oldtype = NULL; |
3c6e6fbf ZW |
2495 | |
2496 | if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype)) | |
f95f80d1 | 2497 | { |
f9837879 | 2498 | /* Avoid `unused variable' and other warnings for OLDDECL. */ |
f95f80d1 SB |
2499 | TREE_NO_WARNING (olddecl) = 1; |
2500 | return false; | |
2501 | } | |
3c6e6fbf | 2502 | |
1ef82ef2 ZW |
2503 | merge_decls (newdecl, olddecl, newtype, oldtype); |
2504 | return true; | |
3c6e6fbf | 2505 | } |
118a3a8b | 2506 | |
3c6e6fbf | 2507 | \f |
1ad463f4 | 2508 | /* Check whether decl-node NEW_DECL shadows an existing declaration. */ |
339a28b9 | 2509 | static void |
1ad463f4 | 2510 | warn_if_shadowing (tree new_decl) |
339a28b9 | 2511 | { |
f75fbaf7 | 2512 | struct c_binding *b; |
339a28b9 | 2513 | |
f75fbaf7 ZW |
2514 | /* Shadow warnings wanted? */ |
2515 | if (!warn_shadow | |
339a28b9 | 2516 | /* No shadow warnings for internally generated vars. */ |
1ad463f4 | 2517 | || DECL_IS_BUILTIN (new_decl) |
339a28b9 | 2518 | /* No shadow warnings for vars made for inlining. */ |
7c47d6e9 | 2519 | || DECL_FROM_INLINE (new_decl)) |
26f943fd NB |
2520 | return; |
2521 | ||
9aaabf8a | 2522 | /* Is anything being shadowed? Invisible decls do not count. */ |
1ad463f4 BI |
2523 | for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed) |
2524 | if (b->decl && b->decl != new_decl && !b->invisible) | |
f75fbaf7 | 2525 | { |
1ad463f4 | 2526 | tree old_decl = b->decl; |
f75fbaf7 | 2527 | |
d8dd2f3a JJ |
2528 | if (old_decl == error_mark_node) |
2529 | { | |
b9b8dde3 DD |
2530 | warning (OPT_Wshadow, "declaration of %q+D shadows previous " |
2531 | "non-variable", new_decl); | |
d8dd2f3a JJ |
2532 | break; |
2533 | } | |
2534 | else if (TREE_CODE (old_decl) == PARM_DECL) | |
b9b8dde3 | 2535 | warning (OPT_Wshadow, "declaration of %q+D shadows a parameter", |
dee15844 | 2536 | new_decl); |
b9b8dde3 DD |
2537 | else if (DECL_FILE_SCOPE_P (old_decl)) |
2538 | warning (OPT_Wshadow, "declaration of %q+D shadows a global " | |
2539 | "declaration", new_decl); | |
1ad463f4 BI |
2540 | else if (TREE_CODE (old_decl) == FUNCTION_DECL |
2541 | && DECL_BUILT_IN (old_decl)) | |
d8dd2f3a | 2542 | { |
b9b8dde3 DD |
2543 | warning (OPT_Wshadow, "declaration of %q+D shadows " |
2544 | "a built-in function", new_decl); | |
d8dd2f3a JJ |
2545 | break; |
2546 | } | |
f75fbaf7 | 2547 | else |
b9b8dde3 | 2548 | warning (OPT_Wshadow, "declaration of %q+D shadows a previous local", |
dee15844 | 2549 | new_decl); |
f75fbaf7 | 2550 | |
c5d75364 MLI |
2551 | warning_at (DECL_SOURCE_LOCATION (old_decl), OPT_Wshadow, |
2552 | "shadowed declaration is here"); | |
a6f78652 | 2553 | |
f75fbaf7 ZW |
2554 | break; |
2555 | } | |
339a28b9 ZW |
2556 | } |
2557 | ||
51e29401 RS |
2558 | /* Record a decl-node X as belonging to the current lexical scope. |
2559 | Check for errors (such as an incompatible declaration for the same | |
2560 | name already seen in the same scope). | |
2561 | ||
2562 | Returns either X or an old decl for the same name. | |
2563 | If an old decl is returned, it may have been smashed | |
2564 | to agree with what X says. */ | |
2565 | ||
2566 | tree | |
35b1a6fa | 2567 | pushdecl (tree x) |
51e29401 | 2568 | { |
b3694847 | 2569 | tree name = DECL_NAME (x); |
f8521984 | 2570 | struct c_scope *scope = current_scope; |
f75fbaf7 | 2571 | struct c_binding *b; |
9aaabf8a | 2572 | bool nested = false; |
b3f27c15 | 2573 | location_t locus = DECL_SOURCE_LOCATION (x); |
51e29401 | 2574 | |
eecec698 ZW |
2575 | /* Must set DECL_CONTEXT for everything not at file scope or |
2576 | DECL_FILE_SCOPE_P won't work. Local externs don't count | |
2577 | unless they have initializers (which generate code). */ | |
2578 | if (current_function_decl | |
2579 | && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL) | |
2580 | || DECL_INITIAL (x) || !DECL_EXTERNAL (x))) | |
339a28b9 | 2581 | DECL_CONTEXT (x) = current_function_decl; |
e13e48e7 | 2582 | |
f75fbaf7 ZW |
2583 | /* Anonymous decls are just inserted in the scope. */ |
2584 | if (!name) | |
51e29401 | 2585 | { |
b3f27c15 JJ |
2586 | bind (name, x, scope, /*invisible=*/false, /*nested=*/false, |
2587 | locus); | |
f75fbaf7 ZW |
2588 | return x; |
2589 | } | |
2590 | ||
2591 | /* First, see if there is another declaration with the same name in | |
2592 | the current scope. If there is, duplicate_decls may do all the | |
2593 | work for us. If duplicate_decls returns false, that indicates | |
2594 | two incompatible decls in the same scope; we are to silently | |
2595 | replace the old one (duplicate_decls has issued all appropriate | |
2596 | diagnostics). In particular, we should not consider possible | |
2597 | duplicates in the external scope, or shadowing. */ | |
2598 | b = I_SYMBOL_BINDING (name); | |
9aaabf8a | 2599 | if (b && B_IN_SCOPE (b, scope)) |
f75fbaf7 | 2600 | { |
2798c11f JM |
2601 | struct c_binding *b_ext, *b_use; |
2602 | tree type = TREE_TYPE (x); | |
2603 | tree visdecl = b->decl; | |
2604 | tree vistype = TREE_TYPE (visdecl); | |
0b410f0b JM |
2605 | if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE |
2606 | && COMPLETE_TYPE_P (TREE_TYPE (x))) | |
2607 | b->inner_comp = false; | |
2798c11f JM |
2608 | b_use = b; |
2609 | b_ext = b; | |
2610 | /* If this is an external linkage declaration, we should check | |
2611 | for compatibility with the type in the external scope before | |
2612 | setting the type at this scope based on the visible | |
2613 | information only. */ | |
2614 | if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl)) | |
2615 | { | |
2616 | while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext)) | |
2617 | b_ext = b_ext->shadowed; | |
2618 | if (b_ext) | |
2619 | { | |
2620 | b_use = b_ext; | |
e1b7793c ILT |
2621 | if (b_use->u.type) |
2622 | TREE_TYPE (b_use->decl) = b_use->u.type; | |
2798c11f JM |
2623 | } |
2624 | } | |
2625 | if (duplicate_decls (x, b_use->decl)) | |
2626 | { | |
2627 | if (b_use != b) | |
2628 | { | |
2629 | /* Save the updated type in the external scope and | |
2630 | restore the proper type for this scope. */ | |
2631 | tree thistype; | |
2632 | if (comptypes (vistype, type)) | |
2633 | thistype = composite_type (vistype, type); | |
2634 | else | |
2635 | thistype = TREE_TYPE (b_use->decl); | |
e1b7793c | 2636 | b_use->u.type = TREE_TYPE (b_use->decl); |
2798c11f JM |
2637 | if (TREE_CODE (b_use->decl) == FUNCTION_DECL |
2638 | && DECL_BUILT_IN (b_use->decl)) | |
2639 | thistype | |
2640 | = build_type_attribute_variant (thistype, | |
2641 | TYPE_ATTRIBUTES | |
e1b7793c | 2642 | (b_use->u.type)); |
2798c11f JM |
2643 | TREE_TYPE (b_use->decl) = thistype; |
2644 | } | |
2645 | return b_use->decl; | |
2646 | } | |
f75fbaf7 ZW |
2647 | else |
2648 | goto skip_external_and_shadow_checks; | |
2649 | } | |
2650 | ||
2651 | /* All declarations with external linkage, and all external | |
2652 | references, go in the external scope, no matter what scope is | |
2653 | current. However, the binding in that scope is ignored for | |
2654 | purposes of normal name lookup. A separate binding structure is | |
2655 | created in the requested scope; this governs the normal | |
2656 | visibility of the symbol. | |
51e29401 | 2657 | |
f75fbaf7 ZW |
2658 | The binding in the externals scope is used exclusively for |
2659 | detecting duplicate declarations of the same object, no matter | |
2660 | what scope they are in; this is what we do here. (C99 6.2.7p2: | |
2661 | All declarations that refer to the same object or function shall | |
2662 | have compatible type; otherwise, the behavior is undefined.) */ | |
2663 | if (DECL_EXTERNAL (x) || scope == file_scope) | |
2664 | { | |
0b410f0b JM |
2665 | tree type = TREE_TYPE (x); |
2666 | tree vistype = 0; | |
2667 | tree visdecl = 0; | |
2668 | bool type_saved = false; | |
2669 | if (b && !B_IN_EXTERNAL_SCOPE (b) | |
2670 | && (TREE_CODE (b->decl) == FUNCTION_DECL | |
2671 | || TREE_CODE (b->decl) == VAR_DECL) | |
2672 | && DECL_FILE_SCOPE_P (b->decl)) | |
2673 | { | |
2674 | visdecl = b->decl; | |
2675 | vistype = TREE_TYPE (visdecl); | |
2676 | } | |
3176a0c2 | 2677 | if (scope != file_scope |
234f46ae | 2678 | && !DECL_IN_SYSTEM_HEADER (x)) |
3176a0c2 | 2679 | warning (OPT_Wnested_externs, "nested extern declaration of %qD", x); |
234f46ae | 2680 | |
9aaabf8a | 2681 | while (b && !B_IN_EXTERNAL_SCOPE (b)) |
0b410f0b JM |
2682 | { |
2683 | /* If this decl might be modified, save its type. This is | |
2684 | done here rather than when the decl is first bound | |
2685 | because the type may change after first binding, through | |
2686 | being completed or through attributes being added. If we | |
2687 | encounter multiple such decls, only the first should have | |
2688 | its type saved; the others will already have had their | |
2689 | proper types saved and the types will not have changed as | |
2690 | their scopes will not have been re-entered. */ | |
d8dd2f3a | 2691 | if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved) |
0b410f0b | 2692 | { |
e1b7793c | 2693 | b->u.type = TREE_TYPE (b->decl); |
0b410f0b JM |
2694 | type_saved = true; |
2695 | } | |
2696 | if (B_IN_FILE_SCOPE (b) | |
2697 | && TREE_CODE (b->decl) == VAR_DECL | |
2698 | && TREE_STATIC (b->decl) | |
2699 | && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE | |
2700 | && !TYPE_DOMAIN (TREE_TYPE (b->decl)) | |
2701 | && TREE_CODE (type) == ARRAY_TYPE | |
2702 | && TYPE_DOMAIN (type) | |
2703 | && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) | |
2704 | && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type)))) | |
2705 | { | |
2706 | /* Array type completed in inner scope, which should be | |
2707 | diagnosed if the completion does not have size 1 and | |
2708 | it does not get completed in the file scope. */ | |
2709 | b->inner_comp = true; | |
2710 | } | |
2711 | b = b->shadowed; | |
2712 | } | |
2713 | ||
2714 | /* If a matching external declaration has been found, set its | |
2715 | type to the composite of all the types of that declaration. | |
2716 | After the consistency checks, it will be reset to the | |
2717 | composite of the visible types only. */ | |
2718 | if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl)) | |
e1b7793c ILT |
2719 | && b->u.type) |
2720 | TREE_TYPE (b->decl) = b->u.type; | |
f75fbaf7 ZW |
2721 | |
2722 | /* The point of the same_translation_unit_p check here is, | |
2723 | we want to detect a duplicate decl for a construct like | |
2724 | foo() { extern bar(); } ... static bar(); but not if | |
2725 | they are in different translation units. In any case, | |
2726 | the static does not go in the externals scope. */ | |
2727 | if (b | |
9affb2c7 | 2728 | && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl)) |
f75fbaf7 | 2729 | && duplicate_decls (x, b->decl)) |
55d54003 | 2730 | { |
0b410f0b | 2731 | tree thistype; |
2798c11f JM |
2732 | if (vistype) |
2733 | { | |
2734 | if (comptypes (vistype, type)) | |
2735 | thistype = composite_type (vistype, type); | |
2736 | else | |
2737 | thistype = TREE_TYPE (b->decl); | |
2738 | } | |
2739 | else | |
2740 | thistype = type; | |
e1b7793c | 2741 | b->u.type = TREE_TYPE (b->decl); |
0b410f0b JM |
2742 | if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl)) |
2743 | thistype | |
2744 | = build_type_attribute_variant (thistype, | |
e1b7793c | 2745 | TYPE_ATTRIBUTES (b->u.type)); |
0b410f0b | 2746 | TREE_TYPE (b->decl) = thistype; |
b3f27c15 JJ |
2747 | bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true, |
2748 | locus); | |
f75fbaf7 | 2749 | return b->decl; |
55d54003 | 2750 | } |
9affb2c7 | 2751 | else if (TREE_PUBLIC (x)) |
6645c3fa | 2752 | { |
0b410f0b JM |
2753 | if (visdecl && !b && duplicate_decls (x, visdecl)) |
2754 | { | |
2755 | /* An external declaration at block scope referring to a | |
2756 | visible entity with internal linkage. The composite | |
2757 | type will already be correct for this scope, so we | |
2758 | just need to fall through to make the declaration in | |
2759 | this scope. */ | |
2760 | nested = true; | |
1b36c818 | 2761 | x = visdecl; |
0b410f0b JM |
2762 | } |
2763 | else | |
2764 | { | |
2765 | bind (name, x, external_scope, /*invisible=*/true, | |
b3f27c15 | 2766 | /*nested=*/false, locus); |
0b410f0b JM |
2767 | nested = true; |
2768 | } | |
51e29401 | 2769 | } |
f75fbaf7 | 2770 | } |
35b1a6fa | 2771 | |
7c47d6e9 JM |
2772 | if (TREE_CODE (x) != PARM_DECL) |
2773 | warn_if_shadowing (x); | |
51e29401 | 2774 | |
f75fbaf7 ZW |
2775 | skip_external_and_shadow_checks: |
2776 | if (TREE_CODE (x) == TYPE_DECL) | |
d0940d56 | 2777 | set_underlying_type (x); |
51e29401 | 2778 | |
b3f27c15 | 2779 | bind (name, x, scope, /*invisible=*/false, nested, locus); |
f75fbaf7 ZW |
2780 | |
2781 | /* If x's type is incomplete because it's based on a | |
2782 | structure or union which has not yet been fully declared, | |
2783 | attach it to that structure or union type, so we can go | |
2784 | back and complete the variable declaration later, if the | |
2785 | structure or union gets fully declared. | |
51e29401 | 2786 | |
f75fbaf7 ZW |
2787 | If the input is erroneous, we can have error_mark in the type |
2788 | slot (e.g. "f(void a, ...)") - that doesn't count as an | |
2789 | incomplete type. */ | |
2790 | if (TREE_TYPE (x) != error_mark_node | |
2791 | && !COMPLETE_TYPE_P (TREE_TYPE (x))) | |
2792 | { | |
2793 | tree element = TREE_TYPE (x); | |
2794 | ||
2795 | while (TREE_CODE (element) == ARRAY_TYPE) | |
2796 | element = TREE_TYPE (element); | |
2797 | element = TYPE_MAIN_VARIANT (element); | |
2798 | ||
2799 | if ((TREE_CODE (element) == RECORD_TYPE | |
2800 | || TREE_CODE (element) == UNION_TYPE) | |
2801 | && (TREE_CODE (x) != TYPE_DECL | |
2802 | || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE) | |
2803 | && !COMPLETE_TYPE_P (element)) | |
2804 | C_TYPE_INCOMPLETE_VARS (element) | |
2805 | = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element)); | |
2806 | } | |
51e29401 RS |
2807 | return x; |
2808 | } | |
2809 | ||
f75fbaf7 | 2810 | /* Record X as belonging to file scope. |
6356f892 | 2811 | This is used only internally by the Objective-C front end, |
f91f41b2 ZW |
2812 | and is limited to its needs. duplicate_decls is not called; |
2813 | if there is any preexisting decl for this identifier, it is an ICE. */ | |
2814 | ||
339a28b9 | 2815 | tree |
35b1a6fa | 2816 | pushdecl_top_level (tree x) |
6970c06a | 2817 | { |
f91f41b2 | 2818 | tree name; |
9aaabf8a | 2819 | bool nested = false; |
943db347 | 2820 | gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL); |
339a28b9 ZW |
2821 | |
2822 | name = DECL_NAME (x); | |
339a28b9 | 2823 | |
943db347 | 2824 | gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name)); |
6970c06a | 2825 | |
9affb2c7 | 2826 | if (TREE_PUBLIC (x)) |
f75fbaf7 | 2827 | { |
b3f27c15 JJ |
2828 | bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false, |
2829 | UNKNOWN_LOCATION); | |
9aaabf8a | 2830 | nested = true; |
f75fbaf7 ZW |
2831 | } |
2832 | if (file_scope) | |
b3f27c15 | 2833 | bind (name, x, file_scope, /*invisible=*/false, nested, UNKNOWN_LOCATION); |
51e29401 | 2834 | |
f91f41b2 | 2835 | return x; |
51e29401 RS |
2836 | } |
2837 | \f | |
f75fbaf7 ZW |
2838 | static void |
2839 | implicit_decl_warning (tree id, tree olddecl) | |
2840 | { | |
dc90f45b | 2841 | if (warn_implicit_function_declaration) |
f75fbaf7 | 2842 | { |
71205d17 MLI |
2843 | bool warned; |
2844 | ||
dc90f45b | 2845 | if (flag_isoc99) |
509c9d60 MLI |
2846 | warned = pedwarn (input_location, OPT_Wimplicit_function_declaration, |
2847 | "implicit declaration of function %qE", id); | |
b8698a0f L |
2848 | else |
2849 | warned = warning (OPT_Wimplicit_function_declaration, | |
71205d17 MLI |
2850 | G_("implicit declaration of function %qE"), id); |
2851 | if (olddecl && warned) | |
2852 | locate_old_decl (olddecl); | |
f75fbaf7 | 2853 | } |
f75fbaf7 ZW |
2854 | } |
2855 | ||
c2255bc4 | 2856 | /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a |
339a28b9 | 2857 | function of type int (). */ |
51e29401 RS |
2858 | |
2859 | tree | |
c2255bc4 | 2860 | implicitly_declare (location_t loc, tree functionid) |
51e29401 | 2861 | { |
0b410f0b JM |
2862 | struct c_binding *b; |
2863 | tree decl = 0; | |
1ae57298 MM |
2864 | tree asmspec_tree; |
2865 | ||
0b410f0b JM |
2866 | for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed) |
2867 | { | |
2868 | if (B_IN_SCOPE (b, external_scope)) | |
2869 | { | |
2870 | decl = b->decl; | |
2871 | break; | |
2872 | } | |
2873 | } | |
51e29401 | 2874 | |
f91f41b2 | 2875 | if (decl) |
339a28b9 | 2876 | { |
d8dd2f3a JJ |
2877 | if (decl == error_mark_node) |
2878 | return decl; | |
2879 | ||
f75fbaf7 ZW |
2880 | /* FIXME: Objective-C has weird not-really-builtin functions |
2881 | which are supposed to be visible automatically. They wind up | |
2882 | in the external scope because they're pushed before the file | |
2883 | scope gets created. Catch this here and rebind them into the | |
2884 | file scope. */ | |
3c20847b | 2885 | if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl)) |
f75fbaf7 | 2886 | { |
9aaabf8a | 2887 | bind (functionid, decl, file_scope, |
b3f27c15 JJ |
2888 | /*invisible=*/false, /*nested=*/true, |
2889 | DECL_SOURCE_LOCATION (decl)); | |
f75fbaf7 ZW |
2890 | return decl; |
2891 | } | |
2892 | else | |
339a28b9 | 2893 | { |
0b410f0b | 2894 | tree newtype = default_function_type; |
e1b7793c ILT |
2895 | if (b->u.type) |
2896 | TREE_TYPE (decl) = b->u.type; | |
f75fbaf7 ZW |
2897 | /* Implicit declaration of a function already declared |
2898 | (somehow) in a different scope, or as a built-in. | |
2899 | If this is the first time this has happened, warn; | |
0b410f0b | 2900 | then recycle the old declaration but with the new type. */ |
f75fbaf7 ZW |
2901 | if (!C_DECL_IMPLICIT (decl)) |
2902 | { | |
2903 | implicit_decl_warning (functionid, decl); | |
2904 | C_DECL_IMPLICIT (decl) = 1; | |
2905 | } | |
9cbe78fb JM |
2906 | if (DECL_BUILT_IN (decl)) |
2907 | { | |
0b410f0b JM |
2908 | newtype = build_type_attribute_variant (newtype, |
2909 | TYPE_ATTRIBUTES | |
2910 | (TREE_TYPE (decl))); | |
2911 | if (!comptypes (newtype, TREE_TYPE (decl))) | |
9cbe78fb | 2912 | { |
c2255bc4 AH |
2913 | warning_at (loc, 0, "incompatible implicit declaration of " |
2914 | "built-in function %qD", decl); | |
0b410f0b | 2915 | newtype = TREE_TYPE (decl); |
9cbe78fb JM |
2916 | } |
2917 | } | |
2918 | else | |
2919 | { | |
0b410f0b | 2920 | if (!comptypes (newtype, TREE_TYPE (decl))) |
9cbe78fb | 2921 | { |
c2255bc4 | 2922 | error_at (loc, "incompatible implicit declaration of function %qD", decl); |
71205d17 | 2923 | locate_old_decl (decl); |
9cbe78fb JM |
2924 | } |
2925 | } | |
e1b7793c | 2926 | b->u.type = TREE_TYPE (decl); |
0b410f0b | 2927 | TREE_TYPE (decl) = newtype; |
9aaabf8a | 2928 | bind (functionid, decl, current_scope, |
b3f27c15 JJ |
2929 | /*invisible=*/false, /*nested=*/true, |
2930 | DECL_SOURCE_LOCATION (decl)); | |
f75fbaf7 | 2931 | return decl; |
339a28b9 | 2932 | } |
339a28b9 | 2933 | } |
51e29401 | 2934 | |
339a28b9 | 2935 | /* Not seen before. */ |
c2255bc4 | 2936 | decl = build_decl (loc, FUNCTION_DECL, functionid, default_function_type); |
1394aabd | 2937 | DECL_EXTERNAL (decl) = 1; |
51e29401 | 2938 | TREE_PUBLIC (decl) = 1; |
339a28b9 | 2939 | C_DECL_IMPLICIT (decl) = 1; |
f75fbaf7 | 2940 | implicit_decl_warning (functionid, 0); |
1ae57298 MM |
2941 | asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL); |
2942 | if (asmspec_tree) | |
2943 | set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree)); | |
51e29401 | 2944 | |
14077d68 | 2945 | /* C89 says implicit declarations are in the innermost block. |
f458d1d5 | 2946 | So we record the decl in the standard fashion. */ |
339a28b9 | 2947 | decl = pushdecl (decl); |
51e29401 | 2948 | |
339a28b9 | 2949 | /* No need to call objc_check_decl here - it's a function type. */ |
0e6df31e | 2950 | rest_of_decl_compilation (decl, 0, 0); |
51e29401 | 2951 | |
14077d68 ZW |
2952 | /* Write a record describing this implicit function declaration |
2953 | to the prototypes file (if requested). */ | |
51e29401 RS |
2954 | gen_aux_info_record (decl, 0, 1, 0); |
2955 | ||
6431177a JM |
2956 | /* Possibly apply some default attributes to this implicit declaration. */ |
2957 | decl_attributes (&decl, NULL_TREE, 0); | |
2958 | ||
51e29401 RS |
2959 | return decl; |
2960 | } | |
2961 | ||
9cd51ef6 ZW |
2962 | /* Issue an error message for a reference to an undeclared variable |
2963 | ID, including a reference to a builtin outside of function-call | |
2964 | context. Establish a binding of the identifier to error_mark_node | |
2965 | in an appropriate scope, which will suppress further errors for the | |
766beb40 | 2966 | same identifier. The error message should be given location LOC. */ |
9cd51ef6 | 2967 | void |
c2255bc4 | 2968 | undeclared_variable (location_t loc, tree id) |
9cd51ef6 ZW |
2969 | { |
2970 | static bool already = false; | |
f91f41b2 | 2971 | struct c_scope *scope; |
9cd51ef6 ZW |
2972 | |
2973 | if (current_function_decl == 0) | |
2974 | { | |
fab922b1 | 2975 | error_at (loc, "%qE undeclared here (not in a function)", id); |
f91f41b2 | 2976 | scope = current_scope; |
9cd51ef6 ZW |
2977 | } |
2978 | else | |
2979 | { | |
fab922b1 | 2980 | error_at (loc, "%qE undeclared (first use in this function)", id); |
3f75a254 | 2981 | if (!already) |
9cd51ef6 | 2982 | { |
0b901e4c MLI |
2983 | inform (loc, "each undeclared identifier is reported only" |
2984 | " once for each function it appears in"); | |
9cd51ef6 ZW |
2985 | already = true; |
2986 | } | |
2987 | ||
f75fbaf7 | 2988 | /* If we are parsing old-style parameter decls, current_function_decl |
c22cacf3 | 2989 | will be nonnull but current_function_scope will be null. */ |
f75fbaf7 | 2990 | scope = current_function_scope ? current_function_scope : current_scope; |
9cd51ef6 | 2991 | } |
b3f27c15 JJ |
2992 | bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false, |
2993 | UNKNOWN_LOCATION); | |
9cd51ef6 | 2994 | } |
51e29401 | 2995 | \f |
14e33ee8 | 2996 | /* Subroutine of lookup_label, declare_label, define_label: construct a |
e1b7793c ILT |
2997 | LABEL_DECL with all the proper frills. Also create a struct |
2998 | c_label_vars initialized for the current scope. */ | |
14e33ee8 ZW |
2999 | |
3000 | static tree | |
e1b7793c ILT |
3001 | make_label (location_t location, tree name, bool defining, |
3002 | struct c_label_vars **p_label_vars) | |
14e33ee8 | 3003 | { |
c2255bc4 | 3004 | tree label = build_decl (location, LABEL_DECL, name, void_type_node); |
e1b7793c | 3005 | struct c_label_vars *label_vars; |
14e33ee8 ZW |
3006 | |
3007 | DECL_CONTEXT (label) = current_function_decl; | |
3008 | DECL_MODE (label) = VOIDmode; | |
14e33ee8 | 3009 | |
a9429e29 | 3010 | label_vars = ggc_alloc_c_label_vars (); |
e1b7793c ILT |
3011 | label_vars->shadowed = NULL; |
3012 | set_spot_bindings (&label_vars->label_bindings, defining); | |
3013 | label_vars->decls_in_scope = make_tree_vector (); | |
3014 | label_vars->gotos = VEC_alloc (c_goto_bindings_p, gc, 0); | |
3015 | *p_label_vars = label_vars; | |
3016 | ||
14e33ee8 ZW |
3017 | return label; |
3018 | } | |
3019 | ||
14e33ee8 | 3020 | /* Get the LABEL_DECL corresponding to identifier NAME as a label. |
51e29401 | 3021 | Create one if none exists so far for the current function. |
14e33ee8 ZW |
3022 | This is called when a label is used in a goto expression or |
3023 | has its address taken. */ | |
51e29401 RS |
3024 | |
3025 | tree | |
14e33ee8 | 3026 | lookup_label (tree name) |
51e29401 | 3027 | { |
14e33ee8 | 3028 | tree label; |
e1b7793c | 3029 | struct c_label_vars *label_vars; |
51e29401 | 3030 | |
7d9795e5 RS |
3031 | if (current_function_decl == 0) |
3032 | { | |
c51a1ba9 | 3033 | error ("label %qE referenced outside of any function", name); |
7d9795e5 RS |
3034 | return 0; |
3035 | } | |
3036 | ||
14e33ee8 ZW |
3037 | /* Use a label already defined or ref'd with this name, but not if |
3038 | it is inherited from a containing function and wasn't declared | |
3039 | using __label__. */ | |
f75fbaf7 | 3040 | label = I_LABEL_DECL (name); |
14e33ee8 ZW |
3041 | if (label && (DECL_CONTEXT (label) == current_function_decl |
3042 | || C_DECLARED_LABEL_FLAG (label))) | |
51e29401 | 3043 | { |
14e33ee8 ZW |
3044 | /* If the label has only been declared, update its apparent |
3045 | location to point here, for better diagnostics if it | |
3046 | turns out not to have been defined. */ | |
e1b7793c | 3047 | if (DECL_INITIAL (label) == NULL_TREE) |
f31686a3 | 3048 | DECL_SOURCE_LOCATION (label) = input_location; |
14e33ee8 | 3049 | return label; |
51e29401 RS |
3050 | } |
3051 | ||
14e33ee8 | 3052 | /* No label binding for that identifier; make one. */ |
e1b7793c | 3053 | label = make_label (input_location, name, false, &label_vars); |
51e29401 | 3054 | |
14077d68 | 3055 | /* Ordinary labels go in the current function scope. */ |
e1b7793c ILT |
3056 | bind_label (name, label, current_function_scope, label_vars); |
3057 | ||
3058 | return label; | |
3059 | } | |
3060 | ||
3061 | /* Issue a warning about DECL for a goto statement at GOTO_LOC going | |
3062 | to LABEL. */ | |
3063 | ||
3064 | static void | |
3065 | warn_about_goto (location_t goto_loc, tree label, tree decl) | |
3066 | { | |
3067 | if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) | |
3068 | error_at (goto_loc, | |
3069 | "jump into scope of identifier with variably modified type"); | |
3070 | else | |
3071 | warning_at (goto_loc, OPT_Wjump_misses_init, | |
3072 | "jump skips variable initialization"); | |
3073 | inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label); | |
3074 | inform (DECL_SOURCE_LOCATION (decl), "%qD declared here", decl); | |
3075 | } | |
3076 | ||
3077 | /* Look up a label because of a goto statement. This is like | |
3078 | lookup_label, but also issues any appropriate warnings. */ | |
3079 | ||
3080 | tree | |
3081 | lookup_label_for_goto (location_t loc, tree name) | |
3082 | { | |
3083 | tree label; | |
3084 | struct c_label_vars *label_vars; | |
3085 | unsigned int ix; | |
3086 | tree decl; | |
3087 | ||
3088 | label = lookup_label (name); | |
3089 | if (label == NULL_TREE) | |
3090 | return NULL_TREE; | |
3091 | ||
3092 | /* If we are jumping to a different function, we can't issue any | |
3093 | useful warnings. */ | |
3094 | if (DECL_CONTEXT (label) != current_function_decl) | |
3095 | { | |
3096 | gcc_assert (C_DECLARED_LABEL_FLAG (label)); | |
3097 | return label; | |
3098 | } | |
3099 | ||
3100 | label_vars = I_LABEL_BINDING (name)->u.label; | |
3101 | ||
3102 | /* If the label has not yet been defined, then push this goto on a | |
3103 | list for possible later warnings. */ | |
3104 | if (label_vars->label_bindings.scope == NULL) | |
3105 | { | |
3106 | struct c_goto_bindings *g; | |
3107 | ||
a9429e29 | 3108 | g = ggc_alloc_c_goto_bindings (); |
e1b7793c ILT |
3109 | g->loc = loc; |
3110 | set_spot_bindings (&g->goto_bindings, true); | |
3111 | VEC_safe_push (c_goto_bindings_p, gc, label_vars->gotos, g); | |
3112 | return label; | |
3113 | } | |
3114 | ||
3115 | /* If there are any decls in label_vars->decls_in_scope, then this | |
3116 | goto has missed the declaration of the decl. This happens for a | |
3117 | case like | |
3118 | int i = 1; | |
3119 | lab: | |
3120 | ... | |
3121 | goto lab; | |
3122 | Issue a warning or error. */ | |
3123 | for (ix = 0; VEC_iterate (tree, label_vars->decls_in_scope, ix, decl); ++ix) | |
3124 | warn_about_goto (loc, label, decl); | |
3125 | ||
3126 | if (label_vars->label_bindings.left_stmt_expr) | |
3127 | { | |
3128 | error_at (loc, "jump into statement expression"); | |
3129 | inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label); | |
3130 | } | |
3131 | ||
14e33ee8 | 3132 | return label; |
51e29401 RS |
3133 | } |
3134 | ||
14e33ee8 ZW |
3135 | /* Make a label named NAME in the current function, shadowing silently |
3136 | any that may be inherited from containing functions or containing | |
3137 | scopes. This is called for __label__ declarations. */ | |
51e29401 | 3138 | |
51e29401 | 3139 | tree |
14e33ee8 | 3140 | declare_label (tree name) |
51e29401 | 3141 | { |
f75fbaf7 ZW |
3142 | struct c_binding *b = I_LABEL_BINDING (name); |
3143 | tree label; | |
e1b7793c | 3144 | struct c_label_vars *label_vars; |
51e29401 | 3145 | |
14e33ee8 ZW |
3146 | /* Check to make sure that the label hasn't already been declared |
3147 | at this scope */ | |
9aaabf8a | 3148 | if (b && B_IN_CURRENT_SCOPE (b)) |
f75fbaf7 | 3149 | { |
c51a1ba9 | 3150 | error ("duplicate label declaration %qE", name); |
71205d17 | 3151 | locate_old_decl (b->decl); |
a784882b | 3152 | |
f75fbaf7 ZW |
3153 | /* Just use the previous declaration. */ |
3154 | return b->decl; | |
3155 | } | |
a784882b | 3156 | |
e1b7793c | 3157 | label = make_label (input_location, name, false, &label_vars); |
14e33ee8 | 3158 | C_DECLARED_LABEL_FLAG (label) = 1; |
51e29401 | 3159 | |
14e33ee8 | 3160 | /* Declared labels go in the current scope. */ |
e1b7793c ILT |
3161 | bind_label (name, label, current_scope, label_vars); |
3162 | ||
14e33ee8 | 3163 | return label; |
51e29401 RS |
3164 | } |
3165 | ||
e1b7793c ILT |
3166 | /* When we define a label, issue any appropriate warnings if there are |
3167 | any gotos earlier in the function which jump to this label. */ | |
3168 | ||
3169 | static void | |
3170 | check_earlier_gotos (tree label, struct c_label_vars* label_vars) | |
3171 | { | |
3172 | unsigned int ix; | |
3173 | struct c_goto_bindings *g; | |
3174 | ||
3175 | for (ix = 0; | |
3176 | VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g); | |
3177 | ++ix) | |
3178 | { | |
3179 | struct c_binding *b; | |
3180 | struct c_scope *scope; | |
3181 | ||
3182 | /* We have a goto to this label. The goto is going forward. In | |
3183 | g->scope, the goto is going to skip any binding which was | |
3184 | defined after g->bindings_in_scope. */ | |
3185 | for (b = g->goto_bindings.scope->bindings; | |
3186 | b != g->goto_bindings.bindings_in_scope; | |
3187 | b = b->prev) | |
3188 | { | |
3189 | if (decl_jump_unsafe (b->decl)) | |
3190 | warn_about_goto (g->loc, label, b->decl); | |
3191 | } | |
3192 | ||
3193 | /* We also need to warn about decls defined in any scopes | |
3194 | between the scope of the label and the scope of the goto. */ | |
3195 | for (scope = label_vars->label_bindings.scope; | |
3196 | scope != g->goto_bindings.scope; | |
3197 | scope = scope->outer) | |
3198 | { | |
3199 | gcc_assert (scope != NULL); | |
3200 | if (scope == label_vars->label_bindings.scope) | |
3201 | b = label_vars->label_bindings.bindings_in_scope; | |
3202 | else | |
3203 | b = scope->bindings; | |
3204 | for (; b != NULL; b = b->prev) | |
3205 | { | |
3206 | if (decl_jump_unsafe (b->decl)) | |
3207 | warn_about_goto (g->loc, label, b->decl); | |
3208 | } | |
3209 | } | |
3210 | ||
3211 | if (g->goto_bindings.stmt_exprs > 0) | |
3212 | { | |
3213 | error_at (g->loc, "jump into statement expression"); | |
3214 | inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", | |
3215 | label); | |
3216 | } | |
3217 | } | |
3218 | ||
3219 | /* Now that the label is defined, we will issue warnings about | |
3220 | subsequent gotos to this label when we see them. */ | |
3221 | VEC_truncate (c_goto_bindings_p, label_vars->gotos, 0); | |
3222 | label_vars->gotos = NULL; | |
3223 | } | |
3224 | ||
51e29401 RS |
3225 | /* Define a label, specifying the location in the source file. |
3226 | Return the LABEL_DECL node for the label, if the definition is valid. | |
3227 | Otherwise return 0. */ | |
3228 | ||
3229 | tree | |
5b030314 | 3230 | define_label (location_t location, tree name) |
51e29401 | 3231 | { |
14e33ee8 ZW |
3232 | /* Find any preexisting label with this name. It is an error |
3233 | if that label has already been defined in this function, or | |
3234 | if there is a containing function with a declared label with | |
3235 | the same name. */ | |
f75fbaf7 | 3236 | tree label = I_LABEL_DECL (name); |
14e33ee8 ZW |
3237 | |
3238 | if (label | |
3239 | && ((DECL_CONTEXT (label) == current_function_decl | |
3240 | && DECL_INITIAL (label) != 0) | |
3241 | || (DECL_CONTEXT (label) != current_function_decl | |
3242 | && C_DECLARED_LABEL_FLAG (label)))) | |
51e29401 | 3243 | { |
c2255bc4 | 3244 | error_at (location, "duplicate label %qD", label); |
71205d17 | 3245 | locate_old_decl (label); |
14e33ee8 | 3246 | return 0; |
51e29401 | 3247 | } |
14e33ee8 | 3248 | else if (label && DECL_CONTEXT (label) == current_function_decl) |
51e29401 | 3249 | { |
e1b7793c ILT |
3250 | struct c_label_vars *label_vars = I_LABEL_BINDING (name)->u.label; |
3251 | ||
14e33ee8 ZW |
3252 | /* The label has been used or declared already in this function, |
3253 | but not defined. Update its location to point to this | |
3254 | definition. */ | |
f31686a3 | 3255 | DECL_SOURCE_LOCATION (label) = location; |
e1b7793c ILT |
3256 | set_spot_bindings (&label_vars->label_bindings, true); |
3257 | ||
3258 | /* Issue warnings as required about any goto statements from | |
3259 | earlier in the function. */ | |
3260 | check_earlier_gotos (label, label_vars); | |
51e29401 RS |
3261 | } |
3262 | else | |
3263 | { | |
e1b7793c ILT |
3264 | struct c_label_vars *label_vars; |
3265 | ||
14e33ee8 | 3266 | /* No label binding for that identifier; make one. */ |
e1b7793c | 3267 | label = make_label (location, name, true, &label_vars); |
14e33ee8 | 3268 | |
14077d68 | 3269 | /* Ordinary labels go in the current function scope. */ |
e1b7793c | 3270 | bind_label (name, label, current_function_scope, label_vars); |
51e29401 | 3271 | } |
14e33ee8 | 3272 | |
44c21c7f | 3273 | if (!in_system_header && lookup_name (name)) |
c2255bc4 AH |
3274 | warning_at (location, OPT_Wtraditional, |
3275 | "traditional C lacks a separate namespace " | |
3276 | "for labels, identifier %qE conflicts", name); | |
14e33ee8 ZW |
3277 | |
3278 | /* Mark label as having been defined. */ | |
3279 | DECL_INITIAL (label) = error_mark_node; | |
3280 | return label; | |
51e29401 | 3281 | } |
51e29401 | 3282 | \f |
e1b7793c ILT |
3283 | /* Get the bindings for a new switch statement. This is used to issue |
3284 | warnings as appropriate for jumps from the switch to case or | |
3285 | default labels. */ | |
3286 | ||
3287 | struct c_spot_bindings * | |
3288 | c_get_switch_bindings (void) | |
3289 | { | |
3290 | struct c_spot_bindings *switch_bindings; | |
3291 | ||
3292 | switch_bindings = XNEW (struct c_spot_bindings); | |
3293 | set_spot_bindings (switch_bindings, true); | |
3294 | return switch_bindings; | |
3295 | } | |
3296 | ||
3297 | void | |
3298 | c_release_switch_bindings (struct c_spot_bindings *bindings) | |
3299 | { | |
3300 | gcc_assert (bindings->stmt_exprs == 0 && !bindings->left_stmt_expr); | |
3301 | XDELETE (bindings); | |
3302 | } | |
3303 | ||
3304 | /* This is called at the point of a case or default label to issue | |
3305 | warnings about decls as needed. It returns true if it found an | |
3306 | error, not just a warning. */ | |
3307 | ||
3308 | bool | |
3309 | c_check_switch_jump_warnings (struct c_spot_bindings *switch_bindings, | |
3310 | location_t switch_loc, location_t case_loc) | |
3311 | { | |
3312 | bool saw_error; | |
3313 | struct c_scope *scope; | |
3314 | ||
3315 | saw_error = false; | |
3316 | for (scope = current_scope; | |
3317 | scope != switch_bindings->scope; | |
3318 | scope = scope->outer) | |
3319 | { | |
3320 | struct c_binding *b; | |
3321 | ||
3322 | gcc_assert (scope != NULL); | |
3323 | for (b = scope->bindings; b != NULL; b = b->prev) | |
3324 | { | |
3325 | if (decl_jump_unsafe (b->decl)) | |
3326 | { | |
3327 | if (variably_modified_type_p (TREE_TYPE (b->decl), NULL_TREE)) | |
3328 | { | |
3329 | saw_error = true; | |
3330 | error_at (case_loc, | |
3331 | ("switch jumps into scope of identifier with " | |
3332 | "variably modified type")); | |
3333 | } | |
3334 | else | |
3335 | warning_at (case_loc, OPT_Wjump_misses_init, | |
3336 | "switch jumps over variable initialization"); | |
3337 | inform (switch_loc, "switch starts here"); | |
3338 | inform (DECL_SOURCE_LOCATION (b->decl), "%qD declared here", | |
3339 | b->decl); | |
3340 | } | |
3341 | } | |
3342 | } | |
3343 | ||
3344 | if (switch_bindings->stmt_exprs > 0) | |
3345 | { | |
3346 | saw_error = true; | |
3347 | error_at (case_loc, "switch jumps into statement expression"); | |
3348 | inform (switch_loc, "switch starts here"); | |
3349 | } | |
3350 | ||
3351 | return saw_error; | |
3352 | } | |
3353 | \f | |
51e29401 RS |
3354 | /* Given NAME, an IDENTIFIER_NODE, |
3355 | return the structure (or union or enum) definition for that name. | |
f8521984 | 3356 | If THISLEVEL_ONLY is nonzero, searches only the current_scope. |
51e29401 RS |
3357 | CODE says which kind of type the caller wants; |
3358 | it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE. | |
24b97832 ILT |
3359 | If PLOC is not NULL and this returns non-null, it sets *PLOC to the |
3360 | location where the tag was defined. | |
51e29401 RS |
3361 | If the wrong kind of type is found, an error is reported. */ |
3362 | ||
3363 | static tree | |
24b97832 ILT |
3364 | lookup_tag (enum tree_code code, tree name, int thislevel_only, |
3365 | location_t *ploc) | |
51e29401 | 3366 | { |
f75fbaf7 | 3367 | struct c_binding *b = I_TAG_BINDING (name); |
339a28b9 | 3368 | int thislevel = 0; |
51e29401 | 3369 | |
f75fbaf7 | 3370 | if (!b || !b->decl) |
339a28b9 ZW |
3371 | return 0; |
3372 | ||
3373 | /* We only care about whether it's in this level if | |
3374 | thislevel_only was set or it might be a type clash. */ | |
f75fbaf7 ZW |
3375 | if (thislevel_only || TREE_CODE (b->decl) != code) |
3376 | { | |
3377 | /* For our purposes, a tag in the external scope is the same as | |
3378 | a tag in the file scope. (Primarily relevant to Objective-C | |
3379 | and its builtin structure tags, which get pushed before the | |
118a3a8b | 3380 | file scope is created.) */ |
9aaabf8a ZW |
3381 | if (B_IN_CURRENT_SCOPE (b) |
3382 | || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b))) | |
339a28b9 | 3383 | thislevel = 1; |
51e29401 | 3384 | } |
339a28b9 ZW |
3385 | |
3386 | if (thislevel_only && !thislevel) | |
3387 | return 0; | |
3388 | ||
f75fbaf7 | 3389 | if (TREE_CODE (b->decl) != code) |
339a28b9 ZW |
3390 | { |
3391 | /* Definition isn't the kind we were looking for. */ | |
3392 | pending_invalid_xref = name; | |
070588f0 | 3393 | pending_invalid_xref_location = input_location; |
339a28b9 ZW |
3394 | |
3395 | /* If in the same binding level as a declaration as a tag | |
3396 | of a different type, this must not be allowed to | |
3397 | shadow that tag, so give the error immediately. | |
3398 | (For example, "struct foo; union foo;" is invalid.) */ | |
3399 | if (thislevel) | |
3400 | pending_xref_error (); | |
3401 | } | |
24b97832 ILT |
3402 | |
3403 | if (ploc != NULL) | |
3404 | *ploc = b->locus; | |
3405 | ||
f75fbaf7 | 3406 | return b->decl; |
51e29401 RS |
3407 | } |
3408 | ||
3409 | /* Print an error message now | |
3410 | for a recent invalid struct, union or enum cross reference. | |
3411 | We don't print them immediately because they are not invalid | |
3412 | when used in the `struct foo;' construct for shadowing. */ | |
3413 | ||
3414 | void | |
35b1a6fa | 3415 | pending_xref_error (void) |
51e29401 RS |
3416 | { |
3417 | if (pending_invalid_xref != 0) | |
fab922b1 MLI |
3418 | error_at (pending_invalid_xref_location, "%qE defined as wrong kind of tag", |
3419 | pending_invalid_xref); | |
51e29401 RS |
3420 | pending_invalid_xref = 0; |
3421 | } | |
3422 | ||
51e29401 | 3423 | \f |
f8521984 | 3424 | /* Look up NAME in the current scope and its superiors |
51e29401 RS |
3425 | in the namespace of variables, functions and typedefs. |
3426 | Return a ..._DECL node of some kind representing its definition, | |
3427 | or return 0 if it is undefined. */ | |
3428 | ||
3429 | tree | |
35b1a6fa | 3430 | lookup_name (tree name) |
51e29401 | 3431 | { |
f75fbaf7 | 3432 | struct c_binding *b = I_SYMBOL_BINDING (name); |
9aaabf8a | 3433 | if (b && !b->invisible) |
f75fbaf7 ZW |
3434 | return b->decl; |
3435 | return 0; | |
51e29401 RS |
3436 | } |
3437 | ||
f75fbaf7 | 3438 | /* Similar to `lookup_name' but look only at the indicated scope. */ |
51e29401 | 3439 | |
339a28b9 | 3440 | static tree |
f75fbaf7 | 3441 | lookup_name_in_scope (tree name, struct c_scope *scope) |
51e29401 | 3442 | { |
f75fbaf7 | 3443 | struct c_binding *b; |
339a28b9 | 3444 | |
f75fbaf7 | 3445 | for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed) |
9aaabf8a | 3446 | if (B_IN_SCOPE (b, scope)) |
f75fbaf7 | 3447 | return b->decl; |
339a28b9 | 3448 | return 0; |
51e29401 RS |
3449 | } |
3450 | \f | |
3451 | /* Create the predefined scalar types of C, | |
0f41302f | 3452 | and some nodes representing standard constants (0, 1, (void *) 0). |
f8521984 | 3453 | Initialize the global scope. |
51e29401 RS |
3454 | Make definitions for built-in primitive functions. */ |
3455 | ||
3456 | void | |
35b1a6fa | 3457 | c_init_decl_processing (void) |
51e29401 | 3458 | { |
4714db5a | 3459 | location_t save_loc = input_location; |
e13e48e7 | 3460 | |
27bf414c | 3461 | /* Initialize reserved words for parser. */ |
f5e99456 NB |
3462 | c_parse_init (); |
3463 | ||
14077d68 | 3464 | current_function_decl = 0; |
6645c3fa | 3465 | |
bc4b653b JM |
3466 | gcc_obstack_init (&parser_obstack); |
3467 | ||
f75fbaf7 ZW |
3468 | /* Make the externals scope. */ |
3469 | push_scope (); | |
3470 | external_scope = current_scope; | |
14077d68 | 3471 | |
e3091a5f R |
3472 | /* Declarations from c_common_nodes_and_builtins must not be associated |
3473 | with this input file, lest we get differences between using and not | |
3474 | using preprocessed headers. */ | |
3c20847b | 3475 | input_location = BUILTINS_LOCATION; |
51e29401 | 3476 | |
3b9e5d95 | 3477 | build_common_tree_nodes (flag_signed_char); |
51e29401 | 3478 | |
eaa7c03f | 3479 | c_common_nodes_and_builtins (); |
51e29401 | 3480 | |
de7df9eb JM |
3481 | /* In C, comparisons and TRUTH_* expressions have type int. */ |
3482 | truthvalue_type_node = integer_type_node; | |
3483 | truthvalue_true_node = integer_one_node; | |
3484 | truthvalue_false_node = integer_zero_node; | |
3485 | ||
3486 | /* Even in C99, which has a real boolean type. */ | |
c2255bc4 | 3487 | pushdecl (build_decl (UNKNOWN_LOCATION, TYPE_DECL, get_identifier ("_Bool"), |
de7df9eb | 3488 | boolean_type_node)); |
19552aa5 | 3489 | |
4714db5a | 3490 | input_location = save_loc; |
e3091a5f | 3491 | |
53cd18ec | 3492 | pedantic_lvalues = true; |
f444e553 | 3493 | |
2ce07e2d | 3494 | make_fname_decl = c_make_fname_decl; |
0ba8a114 | 3495 | start_fname_decls (); |
51e29401 RS |
3496 | } |
3497 | ||
c2255bc4 AH |
3498 | /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to |
3499 | give the decl, NAME is the initialization string and TYPE_DEP | |
3500 | indicates whether NAME depended on the type of the function. As we | |
3501 | don't yet implement delayed emission of static data, we mark the | |
3502 | decl as emitted so it is not placed in the output. Anything using | |
3503 | it must therefore pull out the STRING_CST initializer directly. | |
3504 | FIXME. */ | |
2ce07e2d NS |
3505 | |
3506 | static tree | |
c2255bc4 | 3507 | c_make_fname_decl (location_t loc, tree id, int type_dep) |
2ce07e2d | 3508 | { |
0ba8a114 | 3509 | const char *name = fname_as_string (type_dep); |
2ce07e2d NS |
3510 | tree decl, type, init; |
3511 | size_t length = strlen (name); | |
3512 | ||
46df2823 JM |
3513 | type = build_array_type (char_type_node, |
3514 | build_index_type (size_int (length))); | |
3515 | type = c_build_qualified_type (type, TYPE_QUAL_CONST); | |
2ce07e2d | 3516 | |
c2255bc4 | 3517 | decl = build_decl (loc, VAR_DECL, id, type); |
35b1a6fa | 3518 | |
2ce07e2d NS |
3519 | TREE_STATIC (decl) = 1; |
3520 | TREE_READONLY (decl) = 1; | |
2ce07e2d | 3521 | DECL_ARTIFICIAL (decl) = 1; |
35b1a6fa | 3522 | |
2ce07e2d | 3523 | init = build_string (length + 1, name); |
b1d5455a | 3524 | free (CONST_CAST (char *, name)); |
2ce07e2d NS |
3525 | TREE_TYPE (init) = type; |
3526 | DECL_INITIAL (decl) = init; | |
0ba8a114 NS |
3527 | |
3528 | TREE_USED (decl) = 1; | |
6cce57b0 | 3529 | |
1a4259dc JH |
3530 | if (current_function_decl |
3531 | /* For invalid programs like this: | |
b8698a0f | 3532 | |
1a4259dc JH |
3533 | void foo() |
3534 | const char* p = __FUNCTION__; | |
b8698a0f | 3535 | |
1a4259dc JH |
3536 | the __FUNCTION__ is believed to appear in K&R style function |
3537 | parameter declarator. In that case we still don't have | |
3538 | function_scope. */ | |
1da2ed5f | 3539 | && (!seen_error () || current_function_scope)) |
f91f41b2 ZW |
3540 | { |
3541 | DECL_CONTEXT (decl) = current_function_decl; | |
9aaabf8a | 3542 | bind (id, decl, current_function_scope, |
b3f27c15 | 3543 | /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION); |
f91f41b2 | 3544 | } |
339a28b9 | 3545 | |
c2255bc4 | 3546 | finish_decl (decl, loc, init, NULL_TREE, NULL_TREE); |
6645c3fa | 3547 | |
2ce07e2d NS |
3548 | return decl; |
3549 | } | |
3550 | ||
929f3671 | 3551 | tree |
c79efc4d | 3552 | c_builtin_function (tree decl) |
51e29401 | 3553 | { |
c79efc4d RÁE |
3554 | tree type = TREE_TYPE (decl); |
3555 | tree id = DECL_NAME (decl); | |
3556 | ||
3557 | const char *name = IDENTIFIER_POINTER (id); | |
6fb58bba | 3558 | C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0); |
26db82d8 | 3559 | |
f75fbaf7 | 3560 | /* Should never be called on a symbol with a preexisting meaning. */ |
366de0ce | 3561 | gcc_assert (!I_SYMBOL_BINDING (id)); |
f75fbaf7 | 3562 | |
b3f27c15 JJ |
3563 | bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false, |
3564 | UNKNOWN_LOCATION); | |
f75fbaf7 | 3565 | |
5779e713 MM |
3566 | /* Builtins in the implementation namespace are made visible without |
3567 | needing to be explicitly declared. See push_file_scope. */ | |
3568 | if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1]))) | |
3569 | { | |
3570 | TREE_CHAIN (decl) = visible_builtins; | |
3571 | visible_builtins = decl; | |
3572 | } | |
3573 | ||
3574 | return decl; | |
3575 | } | |
3576 | ||
3577 | tree | |
3578 | c_builtin_function_ext_scope (tree decl) | |
3579 | { | |
3580 | tree type = TREE_TYPE (decl); | |
3581 | tree id = DECL_NAME (decl); | |
3582 | ||
3583 | const char *name = IDENTIFIER_POINTER (id); | |
3584 | C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0); | |
3585 | ||
3586 | /* Should never be called on a symbol with a preexisting meaning. */ | |
3587 | gcc_assert (!I_SYMBOL_BINDING (id)); | |
3588 | ||
b3f27c15 JJ |
3589 | bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false, |
3590 | UNKNOWN_LOCATION); | |
5779e713 | 3591 | |
f75fbaf7 ZW |
3592 | /* Builtins in the implementation namespace are made visible without |
3593 | needing to be explicitly declared. See push_file_scope. */ | |
3594 | if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1]))) | |
3595 | { | |
3596 | TREE_CHAIN (decl) = visible_builtins; | |
3597 | visible_builtins = decl; | |
3598 | } | |
51e29401 RS |
3599 | |
3600 | return decl; | |
3601 | } | |
3602 | \f | |
3603 | /* Called when a declaration is seen that contains no names to declare. | |
3604 | If its type is a reference to a structure, union or enum inherited | |
3605 | from a containing scope, shadow that tag name for the current scope | |
3606 | with a forward reference. | |
3607 | If its type defines a new named structure or union | |
3608 | or defines an enum, it is valid but we need not do anything here. | |
3609 | Otherwise, it is an error. */ | |
3610 | ||
3611 | void | |
deb176fa | 3612 | shadow_tag (const struct c_declspecs *declspecs) |
9282f2f9 RS |
3613 | { |
3614 | shadow_tag_warned (declspecs, 0); | |
3615 | } | |
3616 | ||
0e6df31e GK |
3617 | /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning, |
3618 | but no pedwarn. */ | |
9282f2f9 | 3619 | void |
deb176fa | 3620 | shadow_tag_warned (const struct c_declspecs *declspecs, int warned) |
51e29401 | 3621 | { |
deb176fa | 3622 | bool found_tag = false; |
51e29401 | 3623 | |
98c3a782 | 3624 | if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p) |
51e29401 | 3625 | { |
deb176fa | 3626 | tree value = declspecs->type; |
b3694847 | 3627 | enum tree_code code = TREE_CODE (value); |
51e29401 RS |
3628 | |
3629 | if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE) | |
3630 | /* Used to test also that TYPE_SIZE (value) != 0. | |
3631 | That caused warning for `struct foo;' at top level in the file. */ | |
3632 | { | |
339a28b9 | 3633 | tree name = TYPE_NAME (value); |
b3694847 | 3634 | tree t; |
51e29401 | 3635 | |
deb176fa | 3636 | found_tag = true; |
51e29401 | 3637 | |
da377db9 JM |
3638 | if (declspecs->restrict_p) |
3639 | { | |
3640 | error ("invalid use of %<restrict%>"); | |
3641 | warned = 1; | |
3642 | } | |
3643 | ||
51e29401 RS |
3644 | if (name == 0) |
3645 | { | |
773edaef RK |
3646 | if (warned != 1 && code != ENUMERAL_TYPE) |
3647 | /* Empty unnamed enum OK */ | |
51e29401 | 3648 | { |
509c9d60 MLI |
3649 | pedwarn (input_location, 0, |
3650 | "unnamed struct/union that defines no instances"); | |
51e29401 RS |
3651 | warned = 1; |
3652 | } | |
3653 | } | |
81da229b JM |
3654 | else if (!declspecs->tag_defined_p |
3655 | && declspecs->storage_class != csc_none) | |
3656 | { | |
3657 | if (warned != 1) | |
509c9d60 MLI |
3658 | pedwarn (input_location, 0, |
3659 | "empty declaration with storage class specifier " | |
3660 | "does not redeclare tag"); | |
81da229b JM |
3661 | warned = 1; |
3662 | pending_xref_error (); | |
3663 | } | |
3664 | else if (!declspecs->tag_defined_p | |
3665 | && (declspecs->const_p | |
3666 | || declspecs->volatile_p | |
36c5e70a BE |
3667 | || declspecs->restrict_p |
3668 | || declspecs->address_space)) | |
81da229b JM |
3669 | { |
3670 | if (warned != 1) | |
509c9d60 MLI |
3671 | pedwarn (input_location, 0, |
3672 | "empty declaration with type qualifier " | |
fcf73884 | 3673 | "does not redeclare tag"); |
81da229b JM |
3674 | warned = 1; |
3675 | pending_xref_error (); | |
3676 | } | |
51e29401 RS |
3677 | else |
3678 | { | |
81da229b | 3679 | pending_invalid_xref = 0; |
24b97832 | 3680 | t = lookup_tag (code, name, 1, NULL); |
51e29401 RS |
3681 | |
3682 | if (t == 0) | |
3683 | { | |
3684 | t = make_node (code); | |
c2255bc4 | 3685 | pushtag (input_location, name, t); |
51e29401 RS |
3686 | } |
3687 | } | |
3688 | } | |
3689 | else | |
3690 | { | |
deb176fa | 3691 | if (warned != 1 && !in_system_header) |
773edaef | 3692 | { |
509c9d60 MLI |
3693 | pedwarn (input_location, 0, |
3694 | "useless type name in empty declaration"); | |
deb176fa | 3695 | warned = 1; |
773edaef | 3696 | } |
51e29401 RS |
3697 | } |
3698 | } | |
616aeba2 | 3699 | else if (warned != 1 && !in_system_header && declspecs->typedef_p) |
deb176fa | 3700 | { |
509c9d60 | 3701 | pedwarn (input_location, 0, "useless type name in empty declaration"); |
deb176fa JM |
3702 | warned = 1; |
3703 | } | |
3704 | ||
81da229b JM |
3705 | pending_invalid_xref = 0; |
3706 | ||
9a26d6ee JM |
3707 | if (declspecs->inline_p) |
3708 | { | |
3709 | error ("%<inline%> in empty declaration"); | |
3710 | warned = 1; | |
3711 | } | |
3712 | ||
3713 | if (current_scope == file_scope && declspecs->storage_class == csc_auto) | |
3714 | { | |
3715 | error ("%<auto%> in file-scope empty declaration"); | |
3716 | warned = 1; | |
3717 | } | |
3718 | ||
3719 | if (current_scope == file_scope && declspecs->storage_class == csc_register) | |
3720 | { | |
3721 | error ("%<register%> in file-scope empty declaration"); | |
3722 | warned = 1; | |
3723 | } | |
3724 | ||
3725 | if (!warned && !in_system_header && declspecs->storage_class != csc_none) | |
3726 | { | |
d4ee4d25 | 3727 | warning (0, "useless storage class specifier in empty declaration"); |
9a26d6ee JM |
3728 | warned = 2; |
3729 | } | |
3730 | ||
3731 | if (!warned && !in_system_header && declspecs->thread_p) | |
3732 | { | |
d4ee4d25 | 3733 | warning (0, "useless %<__thread%> in empty declaration"); |
9a26d6ee JM |
3734 | warned = 2; |
3735 | } | |
3736 | ||
3b53cddc JM |
3737 | if (!warned && !in_system_header && (declspecs->const_p |
3738 | || declspecs->volatile_p | |
36c5e70a BE |
3739 | || declspecs->restrict_p |
3740 | || declspecs->address_space)) | |
3b53cddc | 3741 | { |
d4ee4d25 | 3742 | warning (0, "useless type qualifier in empty declaration"); |
3b53cddc JM |
3743 | warned = 2; |
3744 | } | |
3745 | ||
773edaef | 3746 | if (warned != 1) |
51e29401 | 3747 | { |
deb176fa | 3748 | if (!found_tag) |
509c9d60 | 3749 | pedwarn (input_location, 0, "empty declaration"); |
51e29401 RS |
3750 | } |
3751 | } | |
3752 | \f | |
3b53cddc JM |
3753 | |
3754 | /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_* | |
3755 | bits. SPECS represents declaration specifiers that the grammar | |
3756 | only permits to contain type qualifiers and attributes. */ | |
3757 | ||
3758 | int | |
3759 | quals_from_declspecs (const struct c_declspecs *specs) | |
3760 | { | |
3761 | int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0) | |
3762 | | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0) | |
36c5e70a BE |
3763 | | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0) |
3764 | | (ENCODE_QUAL_ADDR_SPACE (specs->address_space))); | |
3b53cddc JM |
3765 | gcc_assert (!specs->type |
3766 | && !specs->decl_attr | |
98c3a782 | 3767 | && specs->typespec_word == cts_none |
3b53cddc JM |
3768 | && specs->storage_class == csc_none |
3769 | && !specs->typedef_p | |
98c3a782 | 3770 | && !specs->explicit_signed_p |
3b53cddc | 3771 | && !specs->deprecated_p |
98c3a782 | 3772 | && !specs->long_p |
3b53cddc | 3773 | && !specs->long_long_p |
98c3a782 JM |
3774 | && !specs->short_p |
3775 | && !specs->signed_p | |
3776 | && !specs->unsigned_p | |
3777 | && !specs->complex_p | |
3b53cddc JM |
3778 | && !specs->inline_p |
3779 | && !specs->thread_p); | |
3780 | return quals; | |
3781 | } | |
3782 | ||
c2255bc4 AH |
3783 | /* Construct an array declarator. LOC is the location of the |
3784 | beginning of the array (usually the opening brace). EXPR is the | |
3785 | expression inside [], or NULL_TREE. QUALS are the type qualifiers | |
3786 | inside the [] (to be applied to the pointer to which a parameter | |
3787 | array is converted). STATIC_P is true if "static" is inside the | |
3788 | [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a | |
3789 | VLA of unspecified length which is nevertheless a complete type, | |
3790 | false otherwise. The field for the contained declarator is left to | |
3791 | be filled in by set_array_declarator_inner. */ | |
0e03329a | 3792 | |
f8893e47 | 3793 | struct c_declarator * |
c2255bc4 AH |
3794 | build_array_declarator (location_t loc, |
3795 | tree expr, struct c_declspecs *quals, bool static_p, | |
60919bce | 3796 | bool vla_unspec_p) |
0e03329a | 3797 | { |
f8893e47 JM |
3798 | struct c_declarator *declarator = XOBNEW (&parser_obstack, |
3799 | struct c_declarator); | |
c2255bc4 | 3800 | declarator->id_loc = loc; |
f8893e47 JM |
3801 | declarator->kind = cdk_array; |
3802 | declarator->declarator = 0; | |
3803 | declarator->u.array.dimen = expr; | |
3b53cddc JM |
3804 | if (quals) |
3805 | { | |
3806 | declarator->u.array.attrs = quals->attrs; | |
3807 | declarator->u.array.quals = quals_from_declspecs (quals); | |
3808 | } | |
3809 | else | |
3810 | { | |
3811 | declarator->u.array.attrs = NULL_TREE; | |
3812 | declarator->u.array.quals = 0; | |
3813 | } | |
f8893e47 JM |
3814 | declarator->u.array.static_p = static_p; |
3815 | declarator->u.array.vla_unspec_p = vla_unspec_p; | |
fcf73884 | 3816 | if (!flag_isoc99) |
0e03329a | 3817 | { |
deb176fa | 3818 | if (static_p || quals != NULL) |
c2255bc4 | 3819 | pedwarn (loc, OPT_pedantic, |
509c9d60 | 3820 | "ISO C90 does not support %<static%> or type " |
bda67431 | 3821 | "qualifiers in parameter array declarators"); |
0e03329a | 3822 | if (vla_unspec_p) |
c2255bc4 | 3823 | pedwarn (loc, OPT_pedantic, |
509c9d60 | 3824 | "ISO C90 does not support %<[*]%> array declarators"); |
0e03329a JM |
3825 | } |
3826 | if (vla_unspec_p) | |
52ffd86e MS |
3827 | { |
3828 | if (!current_scope->parm_flag) | |
3829 | { | |
3830 | /* C99 6.7.5.2p4 */ | |
c2255bc4 AH |
3831 | error_at (loc, "%<[*]%> not allowed in other than " |
3832 | "function prototype scope"); | |
52ffd86e MS |
3833 | declarator->u.array.vla_unspec_p = false; |
3834 | return NULL; | |
3835 | } | |
3836 | current_scope->had_vla_unspec = true; | |
3837 | } | |
f8893e47 | 3838 | return declarator; |
0e03329a JM |
3839 | } |
3840 | ||
f8893e47 JM |
3841 | /* Set the contained declarator of an array declarator. DECL is the |
3842 | declarator, as constructed by build_array_declarator; INNER is what | |
6ac0194d | 3843 | appears on the left of the []. */ |
0e03329a | 3844 | |
f8893e47 JM |
3845 | struct c_declarator * |
3846 | set_array_declarator_inner (struct c_declarator *decl, | |
6ac0194d | 3847 | struct c_declarator *inner) |
0e03329a | 3848 | { |
f8893e47 | 3849 | decl->declarator = inner; |
0e03329a JM |
3850 | return decl; |
3851 | } | |
1f0f7ceb RS |
3852 | |
3853 | /* INIT is a constructor that forms DECL's initializer. If the final | |
3854 | element initializes a flexible array field, add the size of that | |
3855 | initializer to DECL's size. */ | |
3856 | ||
3857 | static void | |
3858 | add_flexible_array_elts_to_size (tree decl, tree init) | |
3859 | { | |
1f0f7ceb RS |
3860 | tree elt, type; |
3861 | ||
2fa6dddd | 3862 | if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init))) |
1f0f7ceb RS |
3863 | return; |
3864 | ||
2fa6dddd | 3865 | elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value; |
1f0f7ceb RS |
3866 | type = TREE_TYPE (elt); |
3867 | if (TREE_CODE (type) == ARRAY_TYPE | |
3868 | && TYPE_SIZE (type) == NULL_TREE | |
3869 | && TYPE_DOMAIN (type) != NULL_TREE | |
3870 | && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE) | |
3871 | { | |
3872 | complete_array_type (&type, elt, false); | |
3873 | DECL_SIZE (decl) | |
3874 | = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type)); | |
3875 | DECL_SIZE_UNIT (decl) | |
3876 | = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type)); | |
3877 | } | |
3878 | } | |
0e03329a | 3879 | \f |
928c19bb JM |
3880 | /* Decode a "typename", such as "int **", returning a ..._TYPE node. |
3881 | Set *EXPR, if EXPR not NULL, to any expression to be evaluated | |
3882 | before the type name, and set *EXPR_CONST_OPERANDS, if | |
3883 | EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may | |
3884 | appear in a constant expression. */ | |
51e29401 RS |
3885 | |
3886 | tree | |
928c19bb JM |
3887 | groktypename (struct c_type_name *type_name, tree *expr, |
3888 | bool *expr_const_operands) | |
51e29401 | 3889 | { |
f8893e47 | 3890 | tree type; |
deb176fa | 3891 | tree attrs = type_name->specs->attrs; |
d3b4cd6f | 3892 | |
deb176fa | 3893 | type_name->specs->attrs = NULL_TREE; |
d3b4cd6f | 3894 | |
deb176fa | 3895 | type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME, |
928c19bb JM |
3896 | false, NULL, &attrs, expr, expr_const_operands, |
3897 | DEPRECATED_NORMAL); | |
d3b4cd6f AH |
3898 | |
3899 | /* Apply attributes. */ | |
f8893e47 | 3900 | decl_attributes (&type, attrs, 0); |
d3b4cd6f | 3901 | |
f8893e47 | 3902 | return type; |
51e29401 RS |
3903 | } |
3904 | ||
51e29401 RS |
3905 | /* Decode a declarator in an ordinary declaration or data definition. |
3906 | This is called as soon as the type information and variable name | |
3907 | have been parsed, before parsing the initializer if any. | |
3908 | Here we create the ..._DECL node, fill in its type, | |
3909 | and put it on the list of decls for the current context. | |
3910 | The ..._DECL node is returned as the value. | |
3911 | ||
3912 | Exception: for arrays where the length is not specified, | |
3913 | the type is left null, to be filled in by `finish_decl'. | |
3914 | ||
3915 | Function definitions do not come here; they go to start_function | |
3916 | instead. However, external and forward declarations of functions | |
3917 | do go through here. Structure field declarations are done by | |
3918 | grokfield and not through here. */ | |
3919 | ||
51e29401 | 3920 | tree |
deb176fa | 3921 | start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs, |
f8893e47 | 3922 | bool initialized, tree attributes) |
51e29401 | 3923 | { |
e23bd218 | 3924 | tree decl; |
b3694847 | 3925 | tree tem; |
928c19bb | 3926 | tree expr = NULL_TREE; |
0da300cd | 3927 | enum deprecated_states deprecated_state = DEPRECATED_NORMAL; |
35b1a6fa | 3928 | |
e23bd218 IR |
3929 | /* An object declared as __attribute__((deprecated)) suppresses |
3930 | warnings of uses of other deprecated items. */ | |
3931 | if (lookup_attribute ("deprecated", attributes)) | |
3932 | deprecated_state = DEPRECATED_SUPPRESS; | |
3933 | ||
3934 | decl = grokdeclarator (declarator, declspecs, | |
928c19bb | 3935 | NORMAL, initialized, NULL, &attributes, &expr, NULL, |
0da300cd | 3936 | deprecated_state); |
6f17bbcf JM |
3937 | if (!decl) |
3938 | return 0; | |
35b1a6fa | 3939 | |
928c19bb JM |
3940 | if (expr) |
3941 | add_stmt (expr); | |
3942 | ||
4003301d | 3943 | if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl))) |
dee15844 | 3944 | warning (OPT_Wmain, "%q+D is usually a function", decl); |
b8705e61 | 3945 | |
51e29401 RS |
3946 | if (initialized) |
3947 | /* Is it valid for this decl to have an initializer at all? | |
3948 | If not, set INITIALIZED to zero, which will indirectly | |
f75fbaf7 | 3949 | tell 'finish_decl' to ignore the initializer once it is parsed. */ |
51e29401 RS |
3950 | switch (TREE_CODE (decl)) |
3951 | { | |
3952 | case TYPE_DECL: | |
bda67431 | 3953 | error ("typedef %qD is initialized (use __typeof__ instead)", decl); |
95f79357 | 3954 | initialized = 0; |
51e29401 RS |
3955 | break; |
3956 | ||
3957 | case FUNCTION_DECL: | |
bda67431 | 3958 | error ("function %qD is initialized like a variable", decl); |
51e29401 RS |
3959 | initialized = 0; |
3960 | break; | |
3961 | ||
3962 | case PARM_DECL: | |
3963 | /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */ | |
bda67431 | 3964 | error ("parameter %qD is initialized", decl); |
51e29401 RS |
3965 | initialized = 0; |
3966 | break; | |
3967 | ||
3968 | default: | |
f75fbaf7 ZW |
3969 | /* Don't allow initializations for incomplete types except for |
3970 | arrays which might be completed by the initialization. */ | |
f4fce7ed | 3971 | |
f75fbaf7 ZW |
3972 | /* This can happen if the array size is an undefined macro. |
3973 | We already gave a warning, so we don't need another one. */ | |
f4fce7ed JW |
3974 | if (TREE_TYPE (decl) == error_mark_node) |
3975 | initialized = 0; | |
3976 | else if (COMPLETE_TYPE_P (TREE_TYPE (decl))) | |
51e29401 RS |
3977 | { |
3978 | /* A complete type is ok if size is fixed. */ | |
3979 | ||
3980 | if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST | |
3981 | || C_DECL_VARIABLE_SIZE (decl)) | |
3982 | { | |
3983 | error ("variable-sized object may not be initialized"); | |
3984 | initialized = 0; | |
3985 | } | |
3986 | } | |
3987 | else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE) | |
3988 | { | |
bda67431 | 3989 | error ("variable %qD has initializer but incomplete type", decl); |
51e29401 RS |
3990 | initialized = 0; |
3991 | } | |
ef787822 JM |
3992 | else if (C_DECL_VARIABLE_SIZE (decl)) |
3993 | { | |
3994 | /* Although C99 is unclear about whether incomplete arrays | |
3995 | of VLAs themselves count as VLAs, it does not make | |
3996 | sense to permit them to be initialized given that | |
3997 | ordinary VLAs may not be initialized. */ | |
3998 | error ("variable-sized object may not be initialized"); | |
3999 | initialized = 0; | |
4000 | } | |
51e29401 RS |
4001 | } |
4002 | ||
4003 | if (initialized) | |
4004 | { | |
f75fbaf7 | 4005 | if (current_scope == file_scope) |
51e29401 RS |
4006 | TREE_STATIC (decl) = 1; |
4007 | ||
f75fbaf7 | 4008 | /* Tell 'pushdecl' this is an initialized decl |
51e29401 | 4009 | even though we don't yet have the initializer expression. |
f75fbaf7 | 4010 | Also tell 'finish_decl' it may store the real initializer. */ |
51e29401 RS |
4011 | DECL_INITIAL (decl) = error_mark_node; |
4012 | } | |
4013 | ||
4014 | /* If this is a function declaration, write a record describing it to the | |
4015 | prototypes file (if requested). */ | |
4016 | ||
4017 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
4018 | gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0); | |
4019 | ||
2786cbad JM |
4020 | /* ANSI specifies that a tentative definition which is not merged with |
4021 | a non-tentative definition behaves exactly like a definition with an | |
4022 | initializer equal to zero. (Section 3.7.2) | |
3d78f2e9 RH |
4023 | |
4024 | -fno-common gives strict ANSI behavior, though this tends to break | |
4025 | a large body of code that grew up without this rule. | |
4026 | ||
4027 | Thread-local variables are never common, since there's no entrenched | |
4028 | body of code to break, and it allows more efficient variable references | |
95bd1dd7 | 4029 | in the presence of dynamic linking. */ |
3d78f2e9 RH |
4030 | |
4031 | if (TREE_CODE (decl) == VAR_DECL | |
4032 | && !initialized | |
4033 | && TREE_PUBLIC (decl) | |
c2f7fa15 | 4034 | && !DECL_THREAD_LOCAL_P (decl) |
3d78f2e9 | 4035 | && !flag_no_common) |
2786cbad | 4036 | DECL_COMMON (decl) = 1; |
8615176a | 4037 | |
daa6d5ff | 4038 | /* Set attributes here so if duplicate decl, will have proper attributes. */ |
59387d2e | 4039 | decl_attributes (&decl, attributes, 0); |
daa6d5ff | 4040 | |
4eb7fd83 JJ |
4041 | /* Handle gnu_inline attribute. */ |
4042 | if (declspecs->inline_p | |
da1c7394 | 4043 | && !flag_gnu89_inline |
4eb7fd83 | 4044 | && TREE_CODE (decl) == FUNCTION_DECL |
6cf59865 JJ |
4045 | && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl)) |
4046 | || current_function_decl)) | |
4eb7fd83 JJ |
4047 | { |
4048 | if (declspecs->storage_class == csc_auto && current_scope != file_scope) | |
4049 | ; | |
4050 | else if (declspecs->storage_class != csc_static) | |
4051 | DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl); | |
4052 | } | |
4eb7fd83 | 4053 | |
61f71b34 DD |
4054 | if (TREE_CODE (decl) == FUNCTION_DECL |
4055 | && targetm.calls.promote_prototypes (TREE_TYPE (decl))) | |
4056 | { | |
f8893e47 | 4057 | struct c_declarator *ce = declarator; |
61f71b34 | 4058 | |
f8893e47 JM |
4059 | if (ce->kind == cdk_pointer) |
4060 | ce = declarator->declarator; | |
4061 | if (ce->kind == cdk_function) | |
61f71b34 | 4062 | { |
f8893e47 | 4063 | tree args = ce->u.arg_info->parms; |
61f71b34 DD |
4064 | for (; args; args = TREE_CHAIN (args)) |
4065 | { | |
4066 | tree type = TREE_TYPE (args); | |
1f4f60fc | 4067 | if (type && INTEGRAL_TYPE_P (type) |
61f71b34 DD |
4068 | && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) |
4069 | DECL_ARG_TYPE (args) = integer_type_node; | |
4070 | } | |
4071 | } | |
4072 | } | |
4073 | ||
9162542e AO |
4074 | if (TREE_CODE (decl) == FUNCTION_DECL |
4075 | && DECL_DECLARED_INLINE_P (decl) | |
4076 | && DECL_UNINLINABLE (decl) | |
4077 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl))) | |
dee15844 JM |
4078 | warning (OPT_Wattributes, "inline function %q+D given attribute noinline", |
4079 | decl); | |
9162542e | 4080 | |
71113fcd GK |
4081 | /* C99 6.7.4p3: An inline definition of a function with external |
4082 | linkage shall not contain a definition of a modifiable object | |
4083 | with static storage duration... */ | |
4084 | if (TREE_CODE (decl) == VAR_DECL | |
4085 | && current_scope != file_scope | |
4086 | && TREE_STATIC (decl) | |
1033ffa8 | 4087 | && !TREE_READONLY (decl) |
71113fcd GK |
4088 | && DECL_DECLARED_INLINE_P (current_function_decl) |
4089 | && DECL_EXTERNAL (current_function_decl)) | |
991d6621 JM |
4090 | record_inline_static (input_location, current_function_decl, |
4091 | decl, csi_modifiable); | |
71113fcd | 4092 | |
f8521984 | 4093 | /* Add this decl to the current scope. |
51e29401 RS |
4094 | TEM may equal DECL or it may be a previous decl of the same name. */ |
4095 | tem = pushdecl (decl); | |
4096 | ||
c1bbfd3c DJ |
4097 | if (initialized && DECL_EXTERNAL (tem)) |
4098 | { | |
4099 | DECL_EXTERNAL (tem) = 0; | |
4100 | TREE_STATIC (tem) = 1; | |
4101 | } | |
bbbcb2e1 | 4102 | |
51e29401 RS |
4103 | return tem; |
4104 | } | |
4105 | ||
4106 | /* Finish processing of a declaration; | |
4107 | install its initial value. | |
bbbbb16a | 4108 | If ORIGTYPE is not NULL_TREE, it is the original type of INIT. |
51e29401 | 4109 | If the length of an array type is not known before, |
c2255bc4 AH |
4110 | it must be determined now, from the initial value, or it is an error. |
4111 | ||
4112 | INIT_LOC is the location of the initial value. */ | |
51e29401 RS |
4113 | |
4114 | void | |
c2255bc4 AH |
4115 | finish_decl (tree decl, location_t init_loc, tree init, |
4116 | tree origtype, tree asmspec_tree) | |
51e29401 | 4117 | { |
aa24028d | 4118 | tree type; |
b5a7159f | 4119 | bool was_incomplete = (DECL_SIZE (decl) == 0); |
520a57c8 | 4120 | const char *asmspec = 0; |
51e29401 | 4121 | |
6d2f8887 | 4122 | /* If a name was specified, get the string. */ |
1ae57298 MM |
4123 | if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL) |
4124 | && DECL_FILE_SCOPE_P (decl)) | |
41c64394 | 4125 | asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree); |
51e29401 | 4126 | if (asmspec_tree) |
72f5a12b | 4127 | asmspec = TREE_STRING_POINTER (asmspec_tree); |
51e29401 | 4128 | |
b646ba3f DS |
4129 | if (TREE_CODE (decl) == VAR_DECL |
4130 | && TREE_STATIC (decl) | |
4131 | && global_bindings_p ()) | |
4132 | /* So decl is a global variable. Record the types it uses | |
4133 | so that we can decide later to emit debug info for them. */ | |
4134 | record_types_used_by_current_var_decl (decl); | |
4135 | ||
51e29401 | 4136 | /* If `start_decl' didn't like having an initialization, ignore it now. */ |
51e29401 RS |
4137 | if (init != 0 && DECL_INITIAL (decl) == 0) |
4138 | init = 0; | |
35b1a6fa | 4139 | |
51e29401 RS |
4140 | /* Don't crash if parm is initialized. */ |
4141 | if (TREE_CODE (decl) == PARM_DECL) | |
4142 | init = 0; | |
4143 | ||
4144 | if (init) | |
c2255bc4 | 4145 | store_init_value (init_loc, decl, init, origtype); |
51e29401 | 4146 | |
264fa2db | 4147 | if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL |
0e6df31e GK |
4148 | || TREE_CODE (decl) == FUNCTION_DECL |
4149 | || TREE_CODE (decl) == FIELD_DECL)) | |
264fa2db ZL |
4150 | objc_check_decl (decl); |
4151 | ||
aa24028d AP |
4152 | type = TREE_TYPE (decl); |
4153 | ||
6614fd40 | 4154 | /* Deduce size of array from initialization, if not already known. */ |
51e29401 RS |
4155 | if (TREE_CODE (type) == ARRAY_TYPE |
4156 | && TYPE_DOMAIN (type) == 0 | |
4157 | && TREE_CODE (decl) != TYPE_DECL) | |
4158 | { | |
aab038d5 | 4159 | bool do_default |
51e29401 RS |
4160 | = (TREE_STATIC (decl) |
4161 | /* Even if pedantic, an external linkage array | |
4162 | may have incomplete type at first. */ | |
4163 | ? pedantic && !TREE_PUBLIC (decl) | |
1394aabd | 4164 | : !DECL_EXTERNAL (decl)); |
51e29401 | 4165 | int failure |
aab038d5 RH |
4166 | = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl), |
4167 | do_default); | |
51e29401 RS |
4168 | |
4169 | /* Get the completed type made by complete_array_type. */ | |
4170 | type = TREE_TYPE (decl); | |
4171 | ||
317a9ac3 | 4172 | switch (failure) |
51e29401 | 4173 | { |
317a9ac3 | 4174 | case 1: |
dee15844 | 4175 | error ("initializer fails to determine size of %q+D", decl); |
317a9ac3 RH |
4176 | break; |
4177 | ||
4178 | case 2: | |
51e29401 | 4179 | if (do_default) |
dee15844 | 4180 | error ("array size missing in %q+D", decl); |
b4892310 RS |
4181 | /* If a `static' var's size isn't known, |
4182 | make it extern as well as static, so it does not get | |
4183 | allocated. | |
4184 | If it is not `static', then do not mark extern; | |
4185 | finish_incomplete_decl will give it a default size | |
4186 | and it will get allocated. */ | |
3f75a254 | 4187 | else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl)) |
1394aabd | 4188 | DECL_EXTERNAL (decl) = 1; |
317a9ac3 RH |
4189 | break; |
4190 | ||
4191 | case 3: | |
dee15844 | 4192 | error ("zero or negative size array %q+D", decl); |
317a9ac3 RH |
4193 | break; |
4194 | ||
4195 | case 0: | |
4196 | /* For global variables, update the copy of the type that | |
4197 | exists in the binding. */ | |
4198 | if (TREE_PUBLIC (decl)) | |
4199 | { | |
4200 | struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl)); | |
4201 | while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext)) | |
4202 | b_ext = b_ext->shadowed; | |
4203 | if (b_ext) | |
4204 | { | |
e1b7793c ILT |
4205 | if (b_ext->u.type) |
4206 | b_ext->u.type = composite_type (b_ext->u.type, type); | |
317a9ac3 | 4207 | else |
e1b7793c | 4208 | b_ext->u.type = type; |
317a9ac3 RH |
4209 | } |
4210 | } | |
4211 | break; | |
4212 | ||
4213 | default: | |
4214 | gcc_unreachable (); | |
51e29401 | 4215 | } |
51e29401 | 4216 | |
aab038d5 RH |
4217 | if (DECL_INITIAL (decl)) |
4218 | TREE_TYPE (DECL_INITIAL (decl)) = type; | |
4219 | ||
51e29401 RS |
4220 | layout_decl (decl, 0); |
4221 | } | |
4222 | ||
4223 | if (TREE_CODE (decl) == VAR_DECL) | |
4224 | { | |
1f0f7ceb RS |
4225 | if (init && TREE_CODE (init) == CONSTRUCTOR) |
4226 | add_flexible_array_elts_to_size (decl, init); | |
4227 | ||
f4fce7ed JW |
4228 | if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node |
4229 | && COMPLETE_TYPE_P (TREE_TYPE (decl))) | |
d575f110 RS |
4230 | layout_decl (decl, 0); |
4231 | ||
a7f64d52 | 4232 | if (DECL_SIZE (decl) == 0 |
f4fce7ed JW |
4233 | /* Don't give an error if we already gave one earlier. */ |
4234 | && TREE_TYPE (decl) != error_mark_node | |
a7f64d52 | 4235 | && (TREE_STATIC (decl) |
0e6df31e GK |
4236 | /* A static variable with an incomplete type |
4237 | is an error if it is initialized. | |
4238 | Also if it is not file scope. | |
4239 | Otherwise, let it through, but if it is not `extern' | |
4240 | then it may cause an error message later. */ | |
4241 | ? (DECL_INITIAL (decl) != 0 | |
4b1e44be | 4242 | || !DECL_FILE_SCOPE_P (decl)) |
0e6df31e GK |
4243 | /* An automatic variable with an incomplete type |
4244 | is an error. */ | |
4245 | : !DECL_EXTERNAL (decl))) | |
4246 | { | |
dee15844 | 4247 | error ("storage size of %q+D isn%'t known", decl); |
0e6df31e GK |
4248 | TREE_TYPE (decl) = error_mark_node; |
4249 | } | |
51e29401 | 4250 | |
1394aabd | 4251 | if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl)) |
90374cc2 | 4252 | && DECL_SIZE (decl) != 0) |
e681c5a1 RS |
4253 | { |
4254 | if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST) | |
4255 | constant_expression_warning (DECL_SIZE (decl)); | |
4256 | else | |
b97d8153 JJ |
4257 | { |
4258 | error ("storage size of %q+D isn%'t constant", decl); | |
4259 | TREE_TYPE (decl) = error_mark_node; | |
4260 | } | |
e681c5a1 | 4261 | } |
e9a25f70 | 4262 | |
6645c3fa | 4263 | if (TREE_USED (type)) |
ebfbbdc5 JJ |
4264 | { |
4265 | TREE_USED (decl) = 1; | |
4266 | DECL_READ_P (decl) = 1; | |
4267 | } | |
51e29401 RS |
4268 | } |
4269 | ||
9661b15f JJ |
4270 | /* If this is a function and an assembler name is specified, reset DECL_RTL |
4271 | so we can give it its new name. Also, update built_in_decls if it | |
4272 | was a normal built-in. */ | |
3c4afaa5 | 4273 | if (TREE_CODE (decl) == FUNCTION_DECL && asmspec) |
6645c3fa | 4274 | { |
9661b15f | 4275 | if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL) |
b482789c | 4276 | set_builtin_user_assembler_name (decl, asmspec); |
0e6df31e | 4277 | set_user_assembler_name (decl, asmspec); |
6645c3fa | 4278 | } |
3c4afaa5 | 4279 | |
d05cc98e | 4280 | /* If #pragma weak was used, mark the decl weak now. */ |
3693d46c | 4281 | maybe_apply_pragma_weak (decl); |
d05cc98e | 4282 | |
51e29401 RS |
4283 | /* Output the assembler code and/or RTL code for variables and functions, |
4284 | unless the type is an undefined structure or union. | |
4285 | If not, it will get done when the type is completed. */ | |
4286 | ||
4287 | if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL) | |
4288 | { | |
b9e75696 JM |
4289 | /* Determine the ELF visibility. */ |
4290 | if (TREE_PUBLIC (decl)) | |
4291 | c_determine_visibility (decl); | |
4292 | ||
0f7866e7 | 4293 | /* This is a no-op in c-lang.c or something real in objc-act.c. */ |
37fa72e9 | 4294 | if (c_dialect_objc ()) |
0f7866e7 | 4295 | objc_check_decl (decl); |
8f17b5c5 | 4296 | |
c22cacf3 | 4297 | if (asmspec) |
0e6df31e GK |
4298 | { |
4299 | /* If this is not a static variable, issue a warning. | |
4300 | It doesn't make any sense to give an ASMSPEC for an | |
4301 | ordinary, non-register local variable. Historically, | |
4302 | GCC has accepted -- but ignored -- the ASMSPEC in | |
4303 | this case. */ | |
3f75a254 | 4304 | if (!DECL_FILE_SCOPE_P (decl) |
0e6df31e GK |
4305 | && TREE_CODE (decl) == VAR_DECL |
4306 | && !C_DECL_REGISTER (decl) | |
4307 | && !TREE_STATIC (decl)) | |
dee15844 JM |
4308 | warning (0, "ignoring asm-specifier for non-static local " |
4309 | "variable %q+D", decl); | |
0e6df31e GK |
4310 | else |
4311 | set_user_assembler_name (decl, asmspec); | |
4312 | } | |
c22cacf3 | 4313 | |
4b1e44be | 4314 | if (DECL_FILE_SCOPE_P (decl)) |
8cf8d8a2 JM |
4315 | { |
4316 | if (DECL_INITIAL (decl) == NULL_TREE | |
4317 | || DECL_INITIAL (decl) == error_mark_node) | |
4318 | /* Don't output anything | |
4319 | when a tentative file-scope definition is seen. | |
4320 | But at end of compilation, do output code for them. */ | |
4321 | DECL_DEFER_OUTPUT (decl) = 1; | |
0e6df31e | 4322 | rest_of_decl_compilation (decl, true, 0); |
8cf8d8a2 | 4323 | } |
8f17b5c5 MM |
4324 | else |
4325 | { | |
0e6df31e GK |
4326 | /* In conjunction with an ASMSPEC, the `register' |
4327 | keyword indicates that we should place the variable | |
4328 | in a particular register. */ | |
4329 | if (asmspec && C_DECL_REGISTER (decl)) | |
3645c4dc | 4330 | { |
0e6df31e GK |
4331 | DECL_HARD_REGISTER (decl) = 1; |
4332 | /* This cannot be done for a structure with volatile | |
4333 | fields, on which DECL_REGISTER will have been | |
4334 | reset. */ | |
4335 | if (!DECL_REGISTER (decl)) | |
4336 | error ("cannot put object with volatile field into register"); | |
3645c4dc | 4337 | } |
0adc3c19 | 4338 | |
c0a4369a | 4339 | if (TREE_CODE (decl) != FUNCTION_DECL) |
174283a3 RH |
4340 | { |
4341 | /* If we're building a variable sized type, and we might be | |
4342 | reachable other than via the top of the current binding | |
4343 | level, then create a new BIND_EXPR so that we deallocate | |
4344 | the object at the right time. */ | |
4345 | /* Note that DECL_SIZE can be null due to errors. */ | |
4346 | if (DECL_SIZE (decl) | |
4347 | && !TREE_CONSTANT (DECL_SIZE (decl)) | |
4348 | && STATEMENT_LIST_HAS_LABEL (cur_stmt_list)) | |
4349 | { | |
4350 | tree bind; | |
53fb4de3 | 4351 | bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL); |
174283a3 RH |
4352 | TREE_SIDE_EFFECTS (bind) = 1; |
4353 | add_stmt (bind); | |
4354 | BIND_EXPR_BODY (bind) = push_stmt_list (); | |
4355 | } | |
c2255bc4 AH |
4356 | add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), |
4357 | DECL_EXPR, decl)); | |
174283a3 | 4358 | } |
8f17b5c5 | 4359 | } |
c22cacf3 | 4360 | |
4dd7201e | 4361 | |
4b1e44be | 4362 | if (!DECL_FILE_SCOPE_P (decl)) |
51e29401 RS |
4363 | { |
4364 | /* Recompute the RTL of a local array now | |
4365 | if it used to be an incomplete type. */ | |
4366 | if (was_incomplete | |
3f75a254 | 4367 | && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl)) |
51e29401 RS |
4368 | { |
4369 | /* If we used it already as memory, it must stay in memory. */ | |
4370 | TREE_ADDRESSABLE (decl) = TREE_USED (decl); | |
4371 | /* If it's still incomplete now, no init will save it. */ | |
4372 | if (DECL_SIZE (decl) == 0) | |
4373 | DECL_INITIAL (decl) = 0; | |
51e29401 | 4374 | } |
51e29401 RS |
4375 | } |
4376 | } | |
4377 | ||
4378 | if (TREE_CODE (decl) == TYPE_DECL) | |
1c9766da RK |
4379 | { |
4380 | if (!DECL_FILE_SCOPE_P (decl) | |
5377d5ba | 4381 | && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) |
c2255bc4 | 4382 | add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl)); |
1c9766da | 4383 | |
0e6df31e | 4384 | rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0); |
1c9766da | 4385 | } |
51e29401 | 4386 | |
51e29401 RS |
4387 | /* At the end of a declaration, throw away any variable type sizes |
4388 | of types defined inside that declaration. There is no use | |
4389 | computing them in the following function definition. */ | |
f75fbaf7 | 4390 | if (current_scope == file_scope) |
51e29401 | 4391 | get_pending_sizes (); |
0bfa5f65 RH |
4392 | |
4393 | /* Install a cleanup (aka destructor) if one was given. */ | |
4394 | if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl)) | |
4395 | { | |
4396 | tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl)); | |
4397 | if (attr) | |
4398 | { | |
0bfa5f65 RH |
4399 | tree cleanup_id = TREE_VALUE (TREE_VALUE (attr)); |
4400 | tree cleanup_decl = lookup_name (cleanup_id); | |
4401 | tree cleanup; | |
bbbbb16a | 4402 | VEC(tree,gc) *vec; |
0bfa5f65 RH |
4403 | |
4404 | /* Build "cleanup(&decl)" for the destructor. */ | |
c9f9eb5d | 4405 | cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0); |
bbbbb16a ILT |
4406 | vec = VEC_alloc (tree, gc, 1); |
4407 | VEC_quick_push (tree, vec, cleanup); | |
c2255bc4 AH |
4408 | cleanup = build_function_call_vec (DECL_SOURCE_LOCATION (decl), |
4409 | cleanup_decl, vec, NULL); | |
bbbbb16a | 4410 | VEC_free (tree, gc, vec); |
0bfa5f65 RH |
4411 | |
4412 | /* Don't warn about decl unused; the cleanup uses it. */ | |
4413 | TREE_USED (decl) = 1; | |
325c3691 | 4414 | TREE_USED (cleanup_decl) = 1; |
ebfbbdc5 | 4415 | DECL_READ_P (decl) = 1; |
0bfa5f65 | 4416 | |
325c3691 | 4417 | push_cleanup (decl, cleanup, false); |
0bfa5f65 RH |
4418 | } |
4419 | } | |
642324bb ILT |
4420 | |
4421 | if (warn_cxx_compat | |
4422 | && TREE_CODE (decl) == VAR_DECL | |
4423 | && TREE_READONLY (decl) | |
4424 | && !DECL_EXTERNAL (decl) | |
4425 | && DECL_INITIAL (decl) == NULL_TREE) | |
4426 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat, | |
4427 | "uninitialized const %qD is invalid in C++", decl); | |
51e29401 RS |
4428 | } |
4429 | ||
c34be55e ZL |
4430 | /* Given a parsed parameter declaration, decode it into a PARM_DECL. */ |
4431 | ||
4432 | tree | |
f8893e47 | 4433 | grokparm (const struct c_parm *parm) |
c34be55e | 4434 | { |
b9baeecd | 4435 | tree attrs = parm->attrs; |
f8893e47 | 4436 | tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, |
928c19bb | 4437 | NULL, &attrs, NULL, NULL, DEPRECATED_NORMAL); |
c34be55e | 4438 | |
b9baeecd | 4439 | decl_attributes (&decl, attrs, 0); |
c34be55e ZL |
4440 | |
4441 | return decl; | |
4442 | } | |
4443 | ||
55d54003 ZW |
4444 | /* Given a parsed parameter declaration, decode it into a PARM_DECL |
4445 | and push that on the current scope. */ | |
51e29401 RS |
4446 | |
4447 | void | |
f8893e47 | 4448 | push_parm_decl (const struct c_parm *parm) |
51e29401 | 4449 | { |
b9baeecd | 4450 | tree attrs = parm->attrs; |
6cc902a1 | 4451 | tree decl; |
14077d68 | 4452 | |
0da300cd | 4453 | decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL, |
928c19bb | 4454 | &attrs, NULL, NULL, DEPRECATED_NORMAL); |
b9baeecd | 4455 | decl_attributes (&decl, attrs, 0); |
6a5ed5bf | 4456 | |
51e29401 RS |
4457 | decl = pushdecl (decl); |
4458 | ||
c2255bc4 | 4459 | finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE); |
51e29401 RS |
4460 | } |
4461 | ||
f75fbaf7 | 4462 | /* Mark all the parameter declarations to date as forward decls. |
f91f41b2 | 4463 | Also diagnose use of this extension. */ |
51e29401 RS |
4464 | |
4465 | void | |
55d54003 | 4466 | mark_forward_parm_decls (void) |
51e29401 | 4467 | { |
f75fbaf7 | 4468 | struct c_binding *b; |
55d54003 ZW |
4469 | |
4470 | if (pedantic && !current_scope->warned_forward_parm_decls) | |
4471 | { | |
509c9d60 MLI |
4472 | pedwarn (input_location, OPT_pedantic, |
4473 | "ISO C forbids forward parameter declarations"); | |
55d54003 ZW |
4474 | current_scope->warned_forward_parm_decls = true; |
4475 | } | |
4476 | ||
f75fbaf7 ZW |
4477 | for (b = current_scope->bindings; b; b = b->prev) |
4478 | if (TREE_CODE (b->decl) == PARM_DECL) | |
4479 | TREE_ASM_WRITTEN (b->decl) = 1; | |
51e29401 RS |
4480 | } |
4481 | \f | |
db3acfa5 JM |
4482 | /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound |
4483 | literal, which may be an incomplete array type completed by the | |
c2255bc4 | 4484 | initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound |
928c19bb JM |
4485 | literal. NON_CONST is true if the initializers contain something |
4486 | that cannot occur in a constant expression. */ | |
db3acfa5 JM |
4487 | |
4488 | tree | |
c2255bc4 | 4489 | build_compound_literal (location_t loc, tree type, tree init, bool non_const) |
db3acfa5 JM |
4490 | { |
4491 | /* We do not use start_decl here because we have a type, not a declarator; | |
4492 | and do not use finish_decl because the decl should be stored inside | |
350fae66 | 4493 | the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */ |
ef787822 | 4494 | tree decl; |
db3acfa5 | 4495 | tree complit; |
8d37a5c0 | 4496 | tree stmt; |
ef787822 | 4497 | |
3e23fb2e AP |
4498 | if (type == error_mark_node |
4499 | || init == error_mark_node) | |
ef787822 JM |
4500 | return error_mark_node; |
4501 | ||
c2255bc4 | 4502 | decl = build_decl (loc, VAR_DECL, NULL_TREE, type); |
db3acfa5 JM |
4503 | DECL_EXTERNAL (decl) = 0; |
4504 | TREE_PUBLIC (decl) = 0; | |
f75fbaf7 | 4505 | TREE_STATIC (decl) = (current_scope == file_scope); |
db3acfa5 JM |
4506 | DECL_CONTEXT (decl) = current_function_decl; |
4507 | TREE_USED (decl) = 1; | |
ebfbbdc5 | 4508 | DECL_READ_P (decl) = 1; |
db3acfa5 | 4509 | TREE_TYPE (decl) = type; |
4f976745 | 4510 | TREE_READONLY (decl) = TYPE_READONLY (type); |
c2255bc4 | 4511 | store_init_value (loc, decl, init, NULL_TREE); |
db3acfa5 JM |
4512 | |
4513 | if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type)) | |
4514 | { | |
aab038d5 RH |
4515 | int failure = complete_array_type (&TREE_TYPE (decl), |
4516 | DECL_INITIAL (decl), true); | |
366de0ce | 4517 | gcc_assert (!failure); |
aab038d5 RH |
4518 | |
4519 | type = TREE_TYPE (decl); | |
4520 | TREE_TYPE (DECL_INITIAL (decl)) = type; | |
db3acfa5 JM |
4521 | } |
4522 | ||
db3acfa5 JM |
4523 | if (type == error_mark_node || !COMPLETE_TYPE_P (type)) |
4524 | return error_mark_node; | |
4525 | ||
c2255bc4 | 4526 | stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl); |
aab038d5 | 4527 | complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt); |
db3acfa5 JM |
4528 | TREE_SIDE_EFFECTS (complit) = 1; |
4529 | ||
4530 | layout_decl (decl, 0); | |
4531 | ||
4532 | if (TREE_STATIC (decl)) | |
4533 | { | |
3b2db49f MM |
4534 | /* This decl needs a name for the assembler output. */ |
4535 | set_compound_literal_name (decl); | |
cf3c4f56 JJ |
4536 | DECL_DEFER_OUTPUT (decl) = 1; |
4537 | DECL_COMDAT (decl) = 1; | |
4538 | DECL_ARTIFICIAL (decl) = 1; | |
78e0d62b | 4539 | DECL_IGNORED_P (decl) = 1; |
cf3c4f56 | 4540 | pushdecl (decl); |
0e6df31e | 4541 | rest_of_decl_compilation (decl, 1, 0); |
db3acfa5 JM |
4542 | } |
4543 | ||
928c19bb JM |
4544 | if (non_const) |
4545 | { | |
4546 | complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit); | |
4547 | C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1; | |
4548 | } | |
4549 | ||
db3acfa5 JM |
4550 | return complit; |
4551 | } | |
24b97832 ILT |
4552 | |
4553 | /* Check the type of a compound literal. Here we just check that it | |
4554 | is valid for C++. */ | |
4555 | ||
4556 | void | |
c2255bc4 | 4557 | check_compound_literal_type (location_t loc, struct c_type_name *type_name) |
24b97832 ILT |
4558 | { |
4559 | if (warn_cxx_compat && type_name->specs->tag_defined_p) | |
4560 | warning_at (loc, OPT_Wc___compat, | |
4561 | "defining a type in a compound literal is invalid in C++"); | |
4562 | } | |
db3acfa5 | 4563 | \f |
2984fe64 JM |
4564 | /* Determine whether TYPE is a structure with a flexible array member, |
4565 | or a union containing such a structure (possibly recursively). */ | |
4566 | ||
4567 | static bool | |
35b1a6fa | 4568 | flexible_array_type_p (tree type) |
2984fe64 JM |
4569 | { |
4570 | tree x; | |
4571 | switch (TREE_CODE (type)) | |
4572 | { | |
4573 | case RECORD_TYPE: | |
4574 | x = TYPE_FIELDS (type); | |
4575 | if (x == NULL_TREE) | |
4576 | return false; | |
4577 | while (TREE_CHAIN (x) != NULL_TREE) | |
4578 | x = TREE_CHAIN (x); | |
4579 | if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE | |
4580 | && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE | |
4581 | && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE | |
4582 | && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE) | |
4583 | return true; | |
4584 | return false; | |
4585 | case UNION_TYPE: | |
4586 | for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x)) | |
4587 | { | |
4588 | if (flexible_array_type_p (TREE_TYPE (x))) | |
4589 | return true; | |
4590 | } | |
4591 | return false; | |
4592 | default: | |
4593 | return false; | |
4594 | } | |
4595 | } | |
4596 | \f | |
2ff7cce4 JM |
4597 | /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME, |
4598 | replacing with appropriate values if they are invalid. */ | |
4599 | static void | |
88388a52 | 4600 | check_bitfield_type_and_width (tree *type, tree *width, tree orig_name) |
2ff7cce4 JM |
4601 | { |
4602 | tree type_mv; | |
4603 | unsigned int max_width; | |
4604 | unsigned HOST_WIDE_INT w; | |
88388a52 JM |
4605 | const char *name = (orig_name |
4606 | ? identifier_to_locale (IDENTIFIER_POINTER (orig_name)) | |
4607 | : _("<anonymous>")); | |
2ff7cce4 | 4608 | |
2ff7cce4 JM |
4609 | /* Detect and ignore out of range field width and process valid |
4610 | field widths. */ | |
d3ae6c2a | 4611 | if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))) |
2ff7cce4 | 4612 | { |
bda67431 | 4613 | error ("bit-field %qs width not an integer constant", name); |
2ff7cce4 JM |
4614 | *width = integer_one_node; |
4615 | } | |
4616 | else | |
4617 | { | |
d3ae6c2a JM |
4618 | if (TREE_CODE (*width) != INTEGER_CST) |
4619 | { | |
4620 | *width = c_fully_fold (*width, false, NULL); | |
4621 | if (TREE_CODE (*width) == INTEGER_CST) | |
4622 | pedwarn (input_location, OPT_pedantic, | |
4623 | "bit-field %qs width not an integer constant expression", | |
4624 | name); | |
4625 | } | |
4626 | if (TREE_CODE (*width) != INTEGER_CST) | |
4627 | { | |
4628 | error ("bit-field %qs width not an integer constant", name); | |
4629 | *width = integer_one_node; | |
4630 | } | |
2ff7cce4 JM |
4631 | constant_expression_warning (*width); |
4632 | if (tree_int_cst_sgn (*width) < 0) | |
4633 | { | |
bda67431 | 4634 | error ("negative width in bit-field %qs", name); |
2ff7cce4 JM |
4635 | *width = integer_one_node; |
4636 | } | |
4637 | else if (integer_zerop (*width) && orig_name) | |
4638 | { | |
bda67431 | 4639 | error ("zero width for bit-field %qs", name); |
2ff7cce4 JM |
4640 | *width = integer_one_node; |
4641 | } | |
4642 | } | |
4643 | ||
4644 | /* Detect invalid bit-field type. */ | |
4645 | if (TREE_CODE (*type) != INTEGER_TYPE | |
4646 | && TREE_CODE (*type) != BOOLEAN_TYPE | |
4647 | && TREE_CODE (*type) != ENUMERAL_TYPE) | |
4648 | { | |
bda67431 | 4649 | error ("bit-field %qs has invalid type", name); |
2ff7cce4 JM |
4650 | *type = unsigned_type_node; |
4651 | } | |
4652 | ||
4653 | type_mv = TYPE_MAIN_VARIANT (*type); | |
fcf73884 | 4654 | if (!in_system_header |
2ff7cce4 JM |
4655 | && type_mv != integer_type_node |
4656 | && type_mv != unsigned_type_node | |
a3bf324c | 4657 | && type_mv != boolean_type_node) |
509c9d60 MLI |
4658 | pedwarn (input_location, OPT_pedantic, |
4659 | "type of bit-field %qs is a GCC extension", name); | |
2ff7cce4 | 4660 | |
02668aba | 4661 | max_width = TYPE_PRECISION (*type); |
2ff7cce4 JM |
4662 | |
4663 | if (0 < compare_tree_int (*width, max_width)) | |
4664 | { | |
bda67431 | 4665 | error ("width of %qs exceeds its type", name); |
2ff7cce4 | 4666 | w = max_width; |
7d60be94 | 4667 | *width = build_int_cst (NULL_TREE, w); |
2ff7cce4 JM |
4668 | } |
4669 | else | |
4670 | w = tree_low_cst (*width, 1); | |
4671 | ||
6de9cd9a DN |
4672 | if (TREE_CODE (*type) == ENUMERAL_TYPE) |
4673 | { | |
4674 | struct lang_type *lt = TYPE_LANG_SPECIFIC (*type); | |
118a3a8b | 4675 | if (!lt |
cdd6a337 MLI |
4676 | || w < tree_int_cst_min_precision (lt->enum_min, TYPE_UNSIGNED (*type)) |
4677 | || w < tree_int_cst_min_precision (lt->enum_max, TYPE_UNSIGNED (*type))) | |
d4ee4d25 | 4678 | warning (0, "%qs is narrower than values of its type", name); |
6de9cd9a | 4679 | } |
2ff7cce4 | 4680 | } |
0b359b01 | 4681 | |
2ff7cce4 | 4682 | \f |
50d50fc7 SP |
4683 | |
4684 | /* Print warning about variable length array if necessary. */ | |
4685 | ||
4686 | static void | |
88388a52 | 4687 | warn_variable_length_array (tree name, tree size) |
50d50fc7 | 4688 | { |
50d50fc7 SP |
4689 | int const_size = TREE_CONSTANT (size); |
4690 | ||
fcf73884 | 4691 | if (!flag_isoc99 && pedantic && warn_vla != 0) |
50d50fc7 SP |
4692 | { |
4693 | if (const_size) | |
4694 | { | |
4695 | if (name) | |
88388a52 JM |
4696 | pedwarn (input_location, OPT_Wvla, |
4697 | "ISO C90 forbids array %qE whose size " | |
50d50fc7 SP |
4698 | "can%'t be evaluated", |
4699 | name); | |
4700 | else | |
509c9d60 | 4701 | pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array whose size " |
50d50fc7 SP |
4702 | "can%'t be evaluated"); |
4703 | } | |
4704 | else | |
4705 | { | |
b8698a0f | 4706 | if (name) |
88388a52 JM |
4707 | pedwarn (input_location, OPT_Wvla, |
4708 | "ISO C90 forbids variable length array %qE", | |
50d50fc7 SP |
4709 | name); |
4710 | else | |
509c9d60 | 4711 | pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array"); |
50d50fc7 SP |
4712 | } |
4713 | } | |
4714 | else if (warn_vla > 0) | |
4715 | { | |
4716 | if (const_size) | |
4717 | { | |
4718 | if (name) | |
4719 | warning (OPT_Wvla, | |
88388a52 | 4720 | "the size of array %qE can" |
50d50fc7 SP |
4721 | "%'t be evaluated", name); |
4722 | else | |
4723 | warning (OPT_Wvla, | |
4724 | "the size of array can %'t be evaluated"); | |
4725 | } | |
4726 | else | |
4727 | { | |
4728 | if (name) | |
4729 | warning (OPT_Wvla, | |
88388a52 | 4730 | "variable length array %qE is used", |
50d50fc7 SP |
4731 | name); |
4732 | else | |
4733 | warning (OPT_Wvla, | |
4734 | "variable length array is used"); | |
4735 | } | |
4736 | } | |
4737 | } | |
4738 | ||
e11187cc JM |
4739 | /* Given a size SIZE that may not be a constant, return a SAVE_EXPR to |
4740 | serve as the actual size-expression for a type or decl. This is | |
4741 | like variable_size in stor-layout.c, but we make global_bindings_p | |
4742 | return negative to avoid calls to that function from outside the | |
4743 | front end resulting in errors at file scope, then call this version | |
4744 | instead from front-end code. */ | |
4745 | ||
4746 | static tree | |
4747 | c_variable_size (tree size) | |
4748 | { | |
4749 | tree save; | |
4750 | ||
4751 | if (TREE_CONSTANT (size)) | |
4752 | return size; | |
4753 | ||
4754 | size = save_expr (size); | |
4755 | ||
4756 | save = skip_simple_arithmetic (size); | |
4757 | ||
4758 | if (cfun && cfun->dont_save_pending_sizes_p) | |
4759 | return size; | |
4760 | ||
4761 | if (!global_bindings_p ()) | |
4762 | put_pending_size (save); | |
4763 | ||
4764 | return size; | |
4765 | } | |
4766 | ||
51e29401 RS |
4767 | /* Given declspecs and a declarator, |
4768 | determine the name and type of the object declared | |
4769 | and construct a ..._DECL node for it. | |
4770 | (In one case we can return a ..._TYPE node instead. | |
4771 | For invalid input we sometimes return 0.) | |
4772 | ||
deb176fa | 4773 | DECLSPECS is a c_declspecs structure for the declaration specifiers. |
51e29401 RS |
4774 | |
4775 | DECL_CONTEXT says which syntactic context this declaration is in: | |
4776 | NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL. | |
4777 | FUNCDEF for a function definition. Like NORMAL but a few different | |
4778 | error messages in each case. Return value may be zero meaning | |
4779 | this definition is too screwy to try to parse. | |
4780 | PARM for a parameter declaration (either within a function prototype | |
4781 | or before a function body). Make a PARM_DECL, or return void_type_node. | |
4782 | TYPENAME if for a typename (in a cast or sizeof). | |
4783 | Don't make a DECL node; just return the ..._TYPE node. | |
4784 | FIELD for a struct or union field; make a FIELD_DECL. | |
60919bce | 4785 | INITIALIZED is true if the decl has an initializer. |
2ff7cce4 JM |
4786 | WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node |
4787 | representing the width of the bit-field. | |
b9baeecd RS |
4788 | DECL_ATTRS points to the list of attributes that should be added to this |
4789 | decl. Any nested attributes that belong on the decl itself will be | |
4790 | added to this list. | |
928c19bb JM |
4791 | If EXPR is not NULL, any expressions that need to be evaluated as |
4792 | part of evaluating variably modified types will be stored in *EXPR. | |
4793 | If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be | |
4794 | set to indicate whether operands in *EXPR can be used in constant | |
4795 | expressions. | |
0da300cd TT |
4796 | DEPRECATED_STATE is a deprecated_states value indicating whether |
4797 | deprecation warnings should be suppressed. | |
51e29401 RS |
4798 | |
4799 | In the TYPENAME case, DECLARATOR is really an absolute declarator. | |
4800 | It may also be so in the PARM case, for a prototype where the | |
4801 | argument type is specified but not the name. | |
4802 | ||
4803 | This function is where the complicated C meanings of `static' | |
929f3671 | 4804 | and `extern' are interpreted. */ |
51e29401 RS |
4805 | |
4806 | static tree | |
deb176fa JM |
4807 | grokdeclarator (const struct c_declarator *declarator, |
4808 | struct c_declspecs *declspecs, | |
0da300cd | 4809 | enum decl_context decl_context, bool initialized, tree *width, |
928c19bb JM |
4810 | tree *decl_attrs, tree *expr, bool *expr_const_operands, |
4811 | enum deprecated_states deprecated_state) | |
51e29401 | 4812 | { |
deb176fa | 4813 | tree type = declspecs->type; |
9a26d6ee JM |
4814 | bool threadp = declspecs->thread_p; |
4815 | enum c_storage_class storage_class = declspecs->storage_class; | |
51e29401 | 4816 | int constp; |
3932261a | 4817 | int restrictp; |
51e29401 | 4818 | int volatilep; |
3932261a | 4819 | int type_quals = TYPE_UNQUALIFIED; |
88388a52 | 4820 | tree name = NULL_TREE; |
52ffd86e | 4821 | bool funcdef_flag = false; |
f8893e47 | 4822 | bool funcdef_syntax = false; |
f9551830 | 4823 | bool size_varies = false; |
98c3a782 | 4824 | tree decl_attr = declspecs->decl_attr; |
3b53cddc JM |
4825 | int array_ptr_quals = TYPE_UNQUALIFIED; |
4826 | tree array_ptr_attrs = NULL_TREE; | |
0e03329a | 4827 | int array_parm_static = 0; |
52ffd86e | 4828 | bool array_parm_vla_unspec_p = false; |
91d231cb | 4829 | tree returned_attrs = NULL_TREE; |
2ff7cce4 | 4830 | bool bitfield = width != NULL; |
85b58ca5 | 4831 | tree element_type; |
f8893e47 | 4832 | struct c_arg_info *arg_info = 0; |
36c5e70a | 4833 | addr_space_t as1, as2, address_space; |
c2255bc4 | 4834 | location_t loc = UNKNOWN_LOCATION; |
40449a90 | 4835 | const char *errmsg; |
928c19bb JM |
4836 | tree expr_dummy; |
4837 | bool expr_const_operands_dummy; | |
4838 | ||
4839 | if (expr == NULL) | |
4840 | expr = &expr_dummy; | |
4841 | if (expr_const_operands == NULL) | |
4842 | expr_const_operands = &expr_const_operands_dummy; | |
4843 | ||
4844 | *expr = declspecs->expr; | |
4845 | *expr_const_operands = declspecs->expr_const_operands; | |
51e29401 RS |
4846 | |
4847 | if (decl_context == FUNCDEF) | |
52ffd86e | 4848 | funcdef_flag = true, decl_context = NORMAL; |
51e29401 | 4849 | |
51e29401 | 4850 | /* Look inside a declarator for the name being declared |
88388a52 | 4851 | and get it as an IDENTIFIER_NODE, for an error message. */ |
51e29401 | 4852 | { |
f8893e47 | 4853 | const struct c_declarator *decl = declarator; |
51e29401 RS |
4854 | |
4855 | while (decl) | |
f8893e47 | 4856 | switch (decl->kind) |
51e29401 | 4857 | { |
f8893e47 | 4858 | case cdk_array: |
c2255bc4 AH |
4859 | loc = decl->id_loc; |
4860 | /* FALL THRU. */ | |
4861 | ||
4862 | case cdk_function: | |
f8893e47 JM |
4863 | case cdk_pointer: |
4864 | funcdef_syntax = (decl->kind == cdk_function); | |
4865 | decl = decl->declarator; | |
51e29401 RS |
4866 | break; |
4867 | ||
f8893e47 JM |
4868 | case cdk_attrs: |
4869 | decl = decl->declarator; | |
91d231cb JM |
4870 | break; |
4871 | ||
f8893e47 | 4872 | case cdk_id: |
c2255bc4 | 4873 | loc = decl->id_loc; |
f8893e47 | 4874 | if (decl->u.id) |
88388a52 | 4875 | name = decl->u.id; |
51e29401 RS |
4876 | decl = 0; |
4877 | break; | |
4878 | ||
4879 | default: | |
366de0ce | 4880 | gcc_unreachable (); |
51e29401 RS |
4881 | } |
4882 | if (name == 0) | |
88388a52 JM |
4883 | { |
4884 | gcc_assert (decl_context == PARM | |
4885 | || decl_context == TYPENAME | |
4886 | || (decl_context == FIELD | |
4887 | && declarator->kind == cdk_id)); | |
4888 | gcc_assert (!initialized); | |
4889 | } | |
51e29401 RS |
4890 | } |
4891 | ||
4892 | /* A function definition's declarator must have the form of | |
4893 | a function declarator. */ | |
4894 | ||
f8893e47 | 4895 | if (funcdef_flag && !funcdef_syntax) |
51e29401 RS |
4896 | return 0; |
4897 | ||
51e29401 RS |
4898 | /* If this looks like a function definition, make it one, |
4899 | even if it occurs where parms are expected. | |
4900 | Then store_parm_decls will reject it and not use it as a parm. */ | |
f75fbaf7 | 4901 | if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag) |
51e29401 RS |
4902 | decl_context = PARM; |
4903 | ||
deb176fa | 4904 | if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS) |
9b86d6bb | 4905 | warn_deprecated_use (declspecs->type, declspecs->decl_attr); |
51e29401 | 4906 | |
5c076987 JM |
4907 | if ((decl_context == NORMAL || decl_context == FIELD) |
4908 | && current_scope == file_scope | |
4909 | && variably_modified_type_p (type, NULL_TREE)) | |
4910 | { | |
88388a52 | 4911 | if (name) |
c2255bc4 | 4912 | error_at (loc, "variably modified %qE at file scope", name); |
88388a52 | 4913 | else |
c2255bc4 | 4914 | error_at (loc, "variably modified field at file scope"); |
5c076987 JM |
4915 | type = integer_type_node; |
4916 | } | |
4917 | ||
f9551830 | 4918 | size_varies = C_TYPE_VARIABLE_SIZE (type) != 0; |
51e29401 | 4919 | |
98c3a782 | 4920 | /* Diagnose defaulting to "int". */ |
720283f2 | 4921 | |
98c3a782 | 4922 | if (declspecs->default_int_p && !in_system_header) |
51e29401 | 4923 | { |
98c3a782 JM |
4924 | /* Issue a warning if this is an ISO C 99 program or if |
4925 | -Wreturn-type and this is a function, or if -Wimplicit; | |
4926 | prefer the former warning since it is more explicit. */ | |
4927 | if ((warn_implicit_int || warn_return_type || flag_isoc99) | |
4928 | && funcdef_flag) | |
4929 | warn_about_return_type = 1; | |
88388a52 JM |
4930 | else |
4931 | { | |
4932 | if (name) | |
b8698a0f | 4933 | pedwarn_c99 (loc, flag_isoc99 ? 0 : OPT_Wimplicit_int, |
88388a52 JM |
4934 | "type defaults to %<int%> in declaration of %qE", |
4935 | name); | |
4936 | else | |
b8698a0f | 4937 | pedwarn_c99 (input_location, flag_isoc99 ? 0 : OPT_Wimplicit_int, |
88388a52 JM |
4938 | "type defaults to %<int%> in type name"); |
4939 | } | |
51e29401 RS |
4940 | } |
4941 | ||
98c3a782 JM |
4942 | /* Adjust the type if a bit-field is being declared, |
4943 | -funsigned-bitfields applied and the type is not explicitly | |
4944 | "signed". */ | |
4945 | if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p | |
4946 | && TREE_CODE (type) == INTEGER_TYPE) | |
726a989a | 4947 | type = unsigned_type_for (type); |
51e29401 | 4948 | |
3932261a MM |
4949 | /* Figure out the type qualifiers for the declaration. There are |
4950 | two ways a declaration can become qualified. One is something | |
4951 | like `const int i' where the `const' is explicit. Another is | |
4952 | something like `typedef const int CI; CI i' where the type of the | |
85b58ca5 JM |
4953 | declaration contains the `const'. A third possibility is that |
4954 | there is a type qualifier on the element type of a typedefed | |
4955 | array type, in which case we should extract that qualifier so | |
5f04ff80 | 4956 | that c_apply_type_quals_to_decl receives the full list of |
85b58ca5 JM |
4957 | qualifiers to work with (C90 is not entirely clear about whether |
4958 | duplicate qualifiers should be diagnosed in this case, but it | |
4959 | seems most appropriate to do so). */ | |
4960 | element_type = strip_array_types (type); | |
3b53cddc JM |
4961 | constp = declspecs->const_p + TYPE_READONLY (element_type); |
4962 | restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type); | |
4963 | volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type); | |
36c5e70a BE |
4964 | as1 = declspecs->address_space; |
4965 | as2 = TYPE_ADDR_SPACE (element_type); | |
4966 | address_space = ADDR_SPACE_GENERIC_P (as1)? as2 : as1; | |
4967 | ||
28fca7e4 RH |
4968 | if (pedantic && !flag_isoc99) |
4969 | { | |
4970 | if (constp > 1) | |
c2255bc4 | 4971 | pedwarn (loc, OPT_pedantic, "duplicate %<const%>"); |
28fca7e4 | 4972 | if (restrictp > 1) |
c2255bc4 | 4973 | pedwarn (loc, OPT_pedantic, "duplicate %<restrict%>"); |
28fca7e4 | 4974 | if (volatilep > 1) |
c2255bc4 | 4975 | pedwarn (loc, OPT_pedantic, "duplicate %<volatile%>"); |
28fca7e4 | 4976 | } |
36c5e70a BE |
4977 | |
4978 | if (!ADDR_SPACE_GENERIC_P (as1) && !ADDR_SPACE_GENERIC_P (as2) && as1 != as2) | |
4979 | error_at (loc, "conflicting named address spaces (%s vs %s)", | |
4980 | c_addr_space_name (as1), c_addr_space_name (as2)); | |
4981 | ||
46df2823 | 4982 | if (!flag_gen_aux_info && (TYPE_QUALS (element_type))) |
51e29401 | 4983 | type = TYPE_MAIN_VARIANT (type); |
3932261a MM |
4984 | type_quals = ((constp ? TYPE_QUAL_CONST : 0) |
4985 | | (restrictp ? TYPE_QUAL_RESTRICT : 0) | |
36c5e70a BE |
4986 | | (volatilep ? TYPE_QUAL_VOLATILE : 0) |
4987 | | ENCODE_QUAL_ADDR_SPACE (address_space)); | |
51e29401 | 4988 | |
9a26d6ee JM |
4989 | /* Warn about storage classes that are invalid for certain |
4990 | kinds of declarations (parameters, typenames, etc.). */ | |
4991 | ||
4992 | if (funcdef_flag | |
4993 | && (threadp | |
4994 | || storage_class == csc_auto | |
4995 | || storage_class == csc_register | |
4996 | || storage_class == csc_typedef)) | |
4997 | { | |
fcf73884 | 4998 | if (storage_class == csc_auto) |
b8698a0f L |
4999 | pedwarn (loc, |
5000 | (current_scope == file_scope) ? 0 : OPT_pedantic, | |
fcf73884 | 5001 | "function definition declared %<auto%>"); |
9a26d6ee | 5002 | if (storage_class == csc_register) |
c2255bc4 | 5003 | error_at (loc, "function definition declared %<register%>"); |
9a26d6ee | 5004 | if (storage_class == csc_typedef) |
c2255bc4 | 5005 | error_at (loc, "function definition declared %<typedef%>"); |
9a26d6ee | 5006 | if (threadp) |
c2255bc4 | 5007 | error_at (loc, "function definition declared %<__thread%>"); |
9a26d6ee JM |
5008 | threadp = false; |
5009 | if (storage_class == csc_auto | |
5010 | || storage_class == csc_register | |
5011 | || storage_class == csc_typedef) | |
5012 | storage_class = csc_none; | |
5013 | } | |
5014 | else if (decl_context != NORMAL && (storage_class != csc_none || threadp)) | |
5015 | { | |
5016 | if (decl_context == PARM && storage_class == csc_register) | |
5017 | ; | |
5018 | else | |
5019 | { | |
5020 | switch (decl_context) | |
5021 | { | |
5022 | case FIELD: | |
88388a52 | 5023 | if (name) |
c2255bc4 AH |
5024 | error_at (loc, "storage class specified for structure " |
5025 | "field %qE", name); | |
88388a52 | 5026 | else |
c2255bc4 | 5027 | error_at (loc, "storage class specified for structure field"); |
9a26d6ee JM |
5028 | break; |
5029 | case PARM: | |
88388a52 | 5030 | if (name) |
c2255bc4 AH |
5031 | error_at (loc, "storage class specified for parameter %qE", |
5032 | name); | |
88388a52 | 5033 | else |
c2255bc4 | 5034 | error_at (loc, "storage class specified for unnamed parameter"); |
9a26d6ee JM |
5035 | break; |
5036 | default: | |
c2255bc4 | 5037 | error_at (loc, "storage class specified for typename"); |
9a26d6ee JM |
5038 | break; |
5039 | } | |
5040 | storage_class = csc_none; | |
5041 | threadp = false; | |
5042 | } | |
5043 | } | |
5044 | else if (storage_class == csc_extern | |
5045 | && initialized | |
5046 | && !funcdef_flag) | |
5047 | { | |
5048 | /* 'extern' with initialization is invalid if not at file scope. */ | |
b8b47f42 GDR |
5049 | if (current_scope == file_scope) |
5050 | { | |
5051 | /* It is fine to have 'extern const' when compiling at C | |
5052 | and C++ intersection. */ | |
5053 | if (!(warn_cxx_compat && constp)) | |
c2255bc4 AH |
5054 | warning_at (loc, 0, "%qE initialized and declared %<extern%>", |
5055 | name); | |
b8b47f42 | 5056 | } |
9a26d6ee | 5057 | else |
c2255bc4 | 5058 | error_at (loc, "%qE has both %<extern%> and initializer", name); |
9a26d6ee JM |
5059 | } |
5060 | else if (current_scope == file_scope) | |
5061 | { | |
5062 | if (storage_class == csc_auto) | |
c2255bc4 AH |
5063 | error_at (loc, "file-scope declaration of %qE specifies %<auto%>", |
5064 | name); | |
9a26d6ee | 5065 | if (pedantic && storage_class == csc_register) |
509c9d60 | 5066 | pedwarn (input_location, OPT_pedantic, |
88388a52 | 5067 | "file-scope declaration of %qE specifies %<register%>", name); |
9a26d6ee JM |
5068 | } |
5069 | else | |
5070 | { | |
5071 | if (storage_class == csc_extern && funcdef_flag) | |
c2255bc4 | 5072 | error_at (loc, "nested function %qE declared %<extern%>", name); |
9a26d6ee JM |
5073 | else if (threadp && storage_class == csc_none) |
5074 | { | |
c2255bc4 AH |
5075 | error_at (loc, "function-scope %qE implicitly auto and declared " |
5076 | "%<__thread%>", | |
5077 | name); | |
9a26d6ee JM |
5078 | threadp = false; |
5079 | } | |
5080 | } | |
51e29401 RS |
5081 | |
5082 | /* Now figure out the structure of the declarator proper. | |
5083 | Descend through it, creating more complex types, until we reach | |
46df2823 JM |
5084 | the declared identifier (or NULL_TREE, in an absolute declarator). |
5085 | At each stage we maintain an unqualified version of the type | |
5086 | together with any qualifiers that should be applied to it with | |
5087 | c_build_qualified_type; this way, array types including | |
5088 | multidimensional array types are first built up in unqualified | |
5089 | form and then the qualified form is created with | |
5090 | TYPE_MAIN_VARIANT pointing to the unqualified form. */ | |
51e29401 | 5091 | |
f8893e47 | 5092 | while (declarator && declarator->kind != cdk_id) |
51e29401 RS |
5093 | { |
5094 | if (type == error_mark_node) | |
5095 | { | |
f8893e47 | 5096 | declarator = declarator->declarator; |
51e29401 RS |
5097 | continue; |
5098 | } | |
5099 | ||
f8893e47 JM |
5100 | /* Each level of DECLARATOR is either a cdk_array (for ...[..]), |
5101 | a cdk_pointer (for *...), | |
5102 | a cdk_function (for ...(...)), | |
5103 | a cdk_attrs (for nested attributes), | |
5104 | or a cdk_id (for the name being declared | |
5105 | or the place in an absolute declarator | |
51e29401 | 5106 | where the name was omitted). |
f8893e47 | 5107 | For the last case, we have just exited the loop. |
51e29401 RS |
5108 | |
5109 | At this point, TYPE is the type of elements of an array, | |
5110 | or for a function to return, or for a pointer to point to. | |
5111 | After this sequence of ifs, TYPE is the type of the | |
5112 | array or function or pointer, and DECLARATOR has had its | |
5113 | outermost layer removed. */ | |
5114 | ||
3b53cddc JM |
5115 | if (array_ptr_quals != TYPE_UNQUALIFIED |
5116 | || array_ptr_attrs != NULL_TREE | |
5117 | || array_parm_static) | |
0e03329a JM |
5118 | { |
5119 | /* Only the innermost declarator (making a parameter be of | |
5120 | array type which is converted to pointer type) | |
5121 | may have static or type qualifiers. */ | |
c2255bc4 | 5122 | error_at (loc, "static or type qualifiers in non-parameter array declarator"); |
3b53cddc JM |
5123 | array_ptr_quals = TYPE_UNQUALIFIED; |
5124 | array_ptr_attrs = NULL_TREE; | |
0e03329a JM |
5125 | array_parm_static = 0; |
5126 | } | |
5127 | ||
f8893e47 | 5128 | switch (declarator->kind) |
51e29401 | 5129 | { |
f8893e47 | 5130 | case cdk_attrs: |
366de0ce | 5131 | { |
f8893e47 JM |
5132 | /* A declarator with embedded attributes. */ |
5133 | tree attrs = declarator->u.attrs; | |
5134 | const struct c_declarator *inner_decl; | |
366de0ce | 5135 | int attr_flags = 0; |
f8893e47 | 5136 | declarator = declarator->declarator; |
366de0ce | 5137 | inner_decl = declarator; |
f8893e47 JM |
5138 | while (inner_decl->kind == cdk_attrs) |
5139 | inner_decl = inner_decl->declarator; | |
5140 | if (inner_decl->kind == cdk_id) | |
366de0ce | 5141 | attr_flags |= (int) ATTR_FLAG_DECL_NEXT; |
f8893e47 | 5142 | else if (inner_decl->kind == cdk_function) |
366de0ce | 5143 | attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT; |
f8893e47 | 5144 | else if (inner_decl->kind == cdk_array) |
366de0ce NS |
5145 | attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT; |
5146 | returned_attrs = decl_attributes (&type, | |
5147 | chainon (returned_attrs, attrs), | |
5148 | attr_flags); | |
5149 | break; | |
5150 | } | |
f8893e47 | 5151 | case cdk_array: |
366de0ce NS |
5152 | { |
5153 | tree itype = NULL_TREE; | |
f8893e47 | 5154 | tree size = declarator->u.array.dimen; |
366de0ce NS |
5155 | /* The index is a signed object `sizetype' bits wide. */ |
5156 | tree index_type = c_common_signed_type (sizetype); | |
5157 | ||
f8893e47 | 5158 | array_ptr_quals = declarator->u.array.quals; |
3b53cddc | 5159 | array_ptr_attrs = declarator->u.array.attrs; |
f8893e47 | 5160 | array_parm_static = declarator->u.array.static_p; |
52ffd86e MS |
5161 | array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p; |
5162 | ||
f8893e47 | 5163 | declarator = declarator->declarator; |
366de0ce NS |
5164 | |
5165 | /* Check for some types that there cannot be arrays of. */ | |
c22cacf3 | 5166 | |
366de0ce NS |
5167 | if (VOID_TYPE_P (type)) |
5168 | { | |
88388a52 | 5169 | if (name) |
c2255bc4 | 5170 | error_at (loc, "declaration of %qE as array of voids", name); |
88388a52 | 5171 | else |
c2255bc4 | 5172 | error_at (loc, "declaration of type name as array of voids"); |
366de0ce NS |
5173 | type = error_mark_node; |
5174 | } | |
c22cacf3 | 5175 | |
366de0ce NS |
5176 | if (TREE_CODE (type) == FUNCTION_TYPE) |
5177 | { | |
88388a52 | 5178 | if (name) |
c2255bc4 AH |
5179 | error_at (loc, "declaration of %qE as array of functions", |
5180 | name); | |
88388a52 | 5181 | else |
c2255bc4 AH |
5182 | error_at (loc, "declaration of type name as array of " |
5183 | "functions"); | |
366de0ce NS |
5184 | type = error_mark_node; |
5185 | } | |
c22cacf3 | 5186 | |
366de0ce | 5187 | if (pedantic && !in_system_header && flexible_array_type_p (type)) |
c2255bc4 | 5188 | pedwarn (loc, OPT_pedantic, |
509c9d60 | 5189 | "invalid use of structure with flexible array member"); |
c22cacf3 | 5190 | |
366de0ce | 5191 | if (size == error_mark_node) |
51e29401 | 5192 | type = error_mark_node; |
c22cacf3 | 5193 | |
366de0ce NS |
5194 | if (type == error_mark_node) |
5195 | continue; | |
e9a25f70 | 5196 | |
366de0ce NS |
5197 | /* If size was specified, set ITYPE to a range-type for |
5198 | that size. Otherwise, ITYPE remains null. finish_decl | |
5199 | may figure it out from an initial value. */ | |
a25f1211 | 5200 | |
366de0ce NS |
5201 | if (size) |
5202 | { | |
928c19bb JM |
5203 | bool size_maybe_const = true; |
5204 | bool size_int_const = (TREE_CODE (size) == INTEGER_CST | |
5205 | && !TREE_OVERFLOW (size)); | |
5206 | bool this_size_varies = false; | |
5207 | ||
366de0ce NS |
5208 | /* Strip NON_LVALUE_EXPRs since we aren't using as an |
5209 | lvalue. */ | |
5210 | STRIP_TYPE_NOPS (size); | |
c22cacf3 | 5211 | |
3f75a254 | 5212 | if (!INTEGRAL_TYPE_P (TREE_TYPE (size))) |
366de0ce | 5213 | { |
88388a52 | 5214 | if (name) |
c2255bc4 AH |
5215 | error_at (loc, "size of array %qE has non-integer type", |
5216 | name); | |
88388a52 | 5217 | else |
c2255bc4 AH |
5218 | error_at (loc, |
5219 | "size of unnamed array has non-integer type"); | |
366de0ce NS |
5220 | size = integer_one_node; |
5221 | } | |
c22cacf3 | 5222 | |
928c19bb JM |
5223 | size = c_fully_fold (size, false, &size_maybe_const); |
5224 | ||
5225 | if (pedantic && size_maybe_const && integer_zerop (size)) | |
88388a52 JM |
5226 | { |
5227 | if (name) | |
c2255bc4 | 5228 | pedwarn (loc, OPT_pedantic, |
88388a52 JM |
5229 | "ISO C forbids zero-size array %qE", name); |
5230 | else | |
c2255bc4 | 5231 | pedwarn (loc, OPT_pedantic, |
88388a52 JM |
5232 | "ISO C forbids zero-size array"); |
5233 | } | |
c22cacf3 | 5234 | |
928c19bb | 5235 | if (TREE_CODE (size) == INTEGER_CST && size_maybe_const) |
366de0ce NS |
5236 | { |
5237 | constant_expression_warning (size); | |
5238 | if (tree_int_cst_sgn (size) < 0) | |
5239 | { | |
88388a52 | 5240 | if (name) |
c2255bc4 | 5241 | error_at (loc, "size of array %qE is negative", name); |
88388a52 | 5242 | else |
c2255bc4 | 5243 | error_at (loc, "size of unnamed array is negative"); |
366de0ce NS |
5244 | size = integer_one_node; |
5245 | } | |
928c19bb JM |
5246 | /* Handle a size folded to an integer constant but |
5247 | not an integer constant expression. */ | |
5248 | if (!size_int_const) | |
5249 | { | |
6ccb2a4a JM |
5250 | /* If this is a file scope declaration of an |
5251 | ordinary identifier, this is invalid code; | |
5252 | diagnosing it here and not subsequently | |
5253 | treating the type as variable-length avoids | |
5254 | more confusing diagnostics later. */ | |
5255 | if ((decl_context == NORMAL || decl_context == FIELD) | |
5256 | && current_scope == file_scope) | |
5257 | pedwarn (input_location, 0, | |
88388a52 JM |
5258 | "variably modified %qE at file scope", |
5259 | name); | |
6ccb2a4a | 5260 | else |
f9551830 | 5261 | this_size_varies = size_varies = true; |
88388a52 | 5262 | warn_variable_length_array (name, size); |
928c19bb | 5263 | } |
366de0ce | 5264 | } |
5c076987 JM |
5265 | else if ((decl_context == NORMAL || decl_context == FIELD) |
5266 | && current_scope == file_scope) | |
5267 | { | |
c2255bc4 | 5268 | error_at (loc, "variably modified %qE at file scope", name); |
5c076987 JM |
5269 | size = integer_one_node; |
5270 | } | |
366de0ce NS |
5271 | else |
5272 | { | |
5273 | /* Make sure the array size remains visibly | |
5274 | nonconstant even if it is (eg) a const variable | |
5275 | with known value. */ | |
f9551830 | 5276 | this_size_varies = size_varies = true; |
88388a52 | 5277 | warn_variable_length_array (name, size); |
366de0ce | 5278 | } |
51e29401 | 5279 | |
928c19bb | 5280 | if (integer_zerop (size) && !this_size_varies) |
366de0ce | 5281 | { |
c22cacf3 MS |
5282 | /* A zero-length array cannot be represented with |
5283 | an unsigned index type, which is what we'll | |
5284 | get with build_index_type. Create an | |
5285 | open-ended range instead. */ | |
366de0ce NS |
5286 | itype = build_range_type (sizetype, size, NULL_TREE); |
5287 | } | |
5288 | else | |
5289 | { | |
8b0b9aef RH |
5290 | /* Arrange for the SAVE_EXPR on the inside of the |
5291 | MINUS_EXPR, which allows the -1 to get folded | |
5292 | with the +1 that happens when building TYPE_SIZE. */ | |
5293 | if (size_varies) | |
e11187cc | 5294 | size = c_variable_size (size); |
928c19bb JM |
5295 | if (this_size_varies && TREE_CODE (size) == INTEGER_CST) |
5296 | size = build2 (COMPOUND_EXPR, TREE_TYPE (size), | |
5297 | integer_zero_node, size); | |
8b0b9aef | 5298 | |
366de0ce NS |
5299 | /* Compute the maximum valid index, that is, size |
5300 | - 1. Do the calculation in index_type, so that | |
5301 | if it is a variable the computations will be | |
5302 | done in the proper mode. */ | |
db3927fb AH |
5303 | itype = fold_build2_loc (loc, MINUS_EXPR, index_type, |
5304 | convert (index_type, size), | |
5305 | convert (index_type, | |
5306 | size_one_node)); | |
366de0ce | 5307 | |
c22cacf3 | 5308 | /* If that overflowed, the array is too big. ??? |
366de0ce NS |
5309 | While a size of INT_MAX+1 technically shouldn't |
5310 | cause an overflow (because we subtract 1), the | |
5311 | overflow is recorded during the conversion to | |
5312 | index_type, before the subtraction. Handling | |
5313 | this case seems like an unnecessary | |
5314 | complication. */ | |
6414bad6 RS |
5315 | if (TREE_CODE (itype) == INTEGER_CST |
5316 | && TREE_OVERFLOW (itype)) | |
366de0ce | 5317 | { |
88388a52 | 5318 | if (name) |
c2255bc4 AH |
5319 | error_at (loc, "size of array %qE is too large", |
5320 | name); | |
88388a52 | 5321 | else |
c2255bc4 | 5322 | error_at (loc, "size of unnamed array is too large"); |
366de0ce NS |
5323 | type = error_mark_node; |
5324 | continue; | |
5325 | } | |
c22cacf3 | 5326 | |
366de0ce NS |
5327 | itype = build_index_type (itype); |
5328 | } | |
928c19bb JM |
5329 | if (this_size_varies) |
5330 | { | |
5331 | if (*expr) | |
5332 | *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size), | |
5333 | *expr, size); | |
5334 | else | |
5335 | *expr = size; | |
5336 | *expr_const_operands &= size_maybe_const; | |
5337 | } | |
366de0ce NS |
5338 | } |
5339 | else if (decl_context == FIELD) | |
5340 | { | |
1de2c900 | 5341 | bool flexible_array_member = false; |
062c4bb3 JM |
5342 | if (array_parm_vla_unspec_p) |
5343 | /* Field names can in fact have function prototype | |
5344 | scope so [*] is disallowed here through making | |
5345 | the field variably modified, not through being | |
5346 | something other than a declaration with function | |
5347 | prototype scope. */ | |
f9551830 | 5348 | size_varies = true; |
1de2c900 JM |
5349 | else |
5350 | { | |
5351 | const struct c_declarator *t = declarator; | |
5352 | while (t->kind == cdk_attrs) | |
5353 | t = t->declarator; | |
5354 | flexible_array_member = (t->kind == cdk_id); | |
5355 | } | |
5356 | if (flexible_array_member | |
5357 | && pedantic && !flag_isoc99 && !in_system_header) | |
c2255bc4 | 5358 | pedwarn (loc, OPT_pedantic, |
509c9d60 | 5359 | "ISO C90 does not support flexible array members"); |
c7b82833 | 5360 | |
366de0ce NS |
5361 | /* ISO C99 Flexible array members are effectively |
5362 | identical to GCC's zero-length array extension. */ | |
1de2c900 JM |
5363 | if (flexible_array_member || array_parm_vla_unspec_p) |
5364 | itype = build_range_type (sizetype, size_zero_node, | |
5365 | NULL_TREE); | |
366de0ce | 5366 | } |
52ffd86e MS |
5367 | else if (decl_context == PARM) |
5368 | { | |
5369 | if (array_parm_vla_unspec_p) | |
5370 | { | |
52ffd86e | 5371 | itype = build_range_type (sizetype, size_zero_node, NULL_TREE); |
f9551830 | 5372 | size_varies = true; |
52ffd86e MS |
5373 | } |
5374 | } | |
8d9f82d5 AO |
5375 | else if (decl_context == TYPENAME) |
5376 | { | |
5377 | if (array_parm_vla_unspec_p) | |
5378 | { | |
062c4bb3 JM |
5379 | /* C99 6.7.5.2p4 */ |
5380 | warning (0, "%<[*]%> not in a declaration"); | |
5381 | /* We use this to avoid messing up with incomplete | |
5382 | array types of the same type, that would | |
5383 | otherwise be modified below. */ | |
8d9f82d5 AO |
5384 | itype = build_range_type (sizetype, size_zero_node, |
5385 | NULL_TREE); | |
f9551830 | 5386 | size_varies = true; |
8d9f82d5 AO |
5387 | } |
5388 | } | |
51e29401 | 5389 | |
b4519d39 SB |
5390 | /* Complain about arrays of incomplete types. */ |
5391 | if (!COMPLETE_TYPE_P (type)) | |
5392 | { | |
c2255bc4 | 5393 | error_at (loc, "array type has incomplete element type"); |
c22cacf3 | 5394 | type = error_mark_node; |
b4519d39 SB |
5395 | } |
5396 | else | |
8d9f82d5 AO |
5397 | /* When itype is NULL, a shared incomplete array type is |
5398 | returned for all array of a given type. Elsewhere we | |
5399 | make sure we don't complete that type before copying | |
5400 | it, but here we want to make sure we don't ever | |
5401 | modify the shared type, so we gcc_assert (itype) | |
5402 | below. */ | |
36c5e70a BE |
5403 | { |
5404 | addr_space_t as = DECODE_QUAL_ADDR_SPACE (type_quals); | |
5405 | if (!ADDR_SPACE_GENERIC_P (as) && as != TYPE_ADDR_SPACE (type)) | |
5406 | type = build_qualified_type (type, | |
5407 | ENCODE_QUAL_ADDR_SPACE (as)); | |
5408 | ||
5409 | type = build_array_type (type, itype); | |
5410 | } | |
51e29401 | 5411 | |
9df594d7 | 5412 | if (type != error_mark_node) |
366de0ce | 5413 | { |
9df594d7 | 5414 | if (size_varies) |
5c076987 | 5415 | { |
8d9f82d5 AO |
5416 | /* It is ok to modify type here even if itype is |
5417 | NULL: if size_varies, we're in a | |
96ff6c8c | 5418 | multi-dimensional array and the inner type has |
8d9f82d5 AO |
5419 | variable size, so the enclosing shared array type |
5420 | must too. */ | |
5c076987 JM |
5421 | if (size && TREE_CODE (size) == INTEGER_CST) |
5422 | type | |
5423 | = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); | |
5424 | C_TYPE_VARIABLE_SIZE (type) = 1; | |
5425 | } | |
9df594d7 RG |
5426 | |
5427 | /* The GCC extension for zero-length arrays differs from | |
5428 | ISO flexible array members in that sizeof yields | |
5429 | zero. */ | |
5430 | if (size && integer_zerop (size)) | |
5431 | { | |
8d9f82d5 | 5432 | gcc_assert (itype); |
9df594d7 RG |
5433 | TYPE_SIZE (type) = bitsize_zero_node; |
5434 | TYPE_SIZE_UNIT (type) = size_zero_node; | |
e4a95933 | 5435 | SET_TYPE_STRUCTURAL_EQUALITY (type); |
9df594d7 | 5436 | } |
52ffd86e MS |
5437 | if (array_parm_vla_unspec_p) |
5438 | { | |
8d9f82d5 | 5439 | gcc_assert (itype); |
52ffd86e MS |
5440 | /* The type is complete. C99 6.7.5.2p4 */ |
5441 | TYPE_SIZE (type) = bitsize_zero_node; | |
5442 | TYPE_SIZE_UNIT (type) = size_zero_node; | |
e4a95933 | 5443 | SET_TYPE_STRUCTURAL_EQUALITY (type); |
52ffd86e | 5444 | } |
366de0ce | 5445 | } |
51e29401 | 5446 | |
366de0ce | 5447 | if (decl_context != PARM |
3b53cddc JM |
5448 | && (array_ptr_quals != TYPE_UNQUALIFIED |
5449 | || array_ptr_attrs != NULL_TREE | |
5450 | || array_parm_static)) | |
366de0ce | 5451 | { |
c2255bc4 | 5452 | error_at (loc, "static or type qualifiers in non-parameter array declarator"); |
3b53cddc JM |
5453 | array_ptr_quals = TYPE_UNQUALIFIED; |
5454 | array_ptr_attrs = NULL_TREE; | |
366de0ce NS |
5455 | array_parm_static = 0; |
5456 | } | |
5457 | break; | |
5458 | } | |
f8893e47 | 5459 | case cdk_function: |
366de0ce NS |
5460 | { |
5461 | /* Say it's a definition only for the declarator closest | |
5462 | to the identifier, apart possibly from some | |
5463 | attributes. */ | |
5464 | bool really_funcdef = false; | |
5465 | tree arg_types; | |
5466 | if (funcdef_flag) | |
5467 | { | |
f8893e47 JM |
5468 | const struct c_declarator *t = declarator->declarator; |
5469 | while (t->kind == cdk_attrs) | |
5470 | t = t->declarator; | |
5471 | really_funcdef = (t->kind == cdk_id); | |
366de0ce | 5472 | } |
51e29401 | 5473 | |
366de0ce NS |
5474 | /* Declaring a function type. Make sure we have a valid |
5475 | type for the function to return. */ | |
5476 | if (type == error_mark_node) | |
5477 | continue; | |
c22cacf3 | 5478 | |
f9551830 | 5479 | size_varies = false; |
51e29401 | 5480 | |
366de0ce NS |
5481 | /* Warn about some types functions can't return. */ |
5482 | if (TREE_CODE (type) == FUNCTION_TYPE) | |
5483 | { | |
88388a52 | 5484 | if (name) |
c2255bc4 AH |
5485 | error_at (loc, "%qE declared as function returning a " |
5486 | "function", name); | |
88388a52 | 5487 | else |
c2255bc4 AH |
5488 | error_at (loc, "type name declared as function " |
5489 | "returning a function"); | |
366de0ce NS |
5490 | type = integer_type_node; |
5491 | } | |
5492 | if (TREE_CODE (type) == ARRAY_TYPE) | |
5493 | { | |
88388a52 | 5494 | if (name) |
c2255bc4 AH |
5495 | error_at (loc, "%qE declared as function returning an array", |
5496 | name); | |
88388a52 | 5497 | else |
c2255bc4 AH |
5498 | error_at (loc, "type name declared as function returning " |
5499 | "an array"); | |
366de0ce NS |
5500 | type = integer_type_node; |
5501 | } | |
40449a90 SL |
5502 | errmsg = targetm.invalid_return_type (type); |
5503 | if (errmsg) | |
5504 | { | |
5505 | error (errmsg); | |
5506 | type = integer_type_node; | |
5507 | } | |
51e29401 | 5508 | |
366de0ce NS |
5509 | /* Construct the function type and go to the next |
5510 | inner layer of declarator. */ | |
f8893e47 | 5511 | arg_info = declarator->u.arg_info; |
366de0ce | 5512 | arg_types = grokparms (arg_info, really_funcdef); |
3542a5c0 JM |
5513 | if (really_funcdef) |
5514 | put_pending_sizes (arg_info->pending_sizes); | |
51e29401 | 5515 | |
366de0ce NS |
5516 | /* Type qualifiers before the return type of the function |
5517 | qualify the return type, not the function type. */ | |
5518 | if (type_quals) | |
5519 | { | |
c22cacf3 | 5520 | /* Type qualifiers on a function return type are |
366de0ce NS |
5521 | normally permitted by the standard but have no |
5522 | effect, so give a warning at -Wreturn-type. | |
5523 | Qualifiers on a void return type are banned on | |
5524 | function definitions in ISO C; GCC used to used | |
5525 | them for noreturn functions. */ | |
5526 | if (VOID_TYPE_P (type) && really_funcdef) | |
c2255bc4 | 5527 | pedwarn (loc, 0, |
509c9d60 | 5528 | "function definition has qualified void return type"); |
44c21c7f | 5529 | else |
c2255bc4 | 5530 | warning_at (loc, OPT_Wignored_qualifiers, |
44c21c7f | 5531 | "type qualifiers ignored on function return type"); |
c22cacf3 | 5532 | |
366de0ce NS |
5533 | type = c_build_qualified_type (type, type_quals); |
5534 | } | |
5535 | type_quals = TYPE_UNQUALIFIED; | |
c22cacf3 | 5536 | |
366de0ce | 5537 | type = build_function_type (type, arg_types); |
f8893e47 | 5538 | declarator = declarator->declarator; |
c22cacf3 | 5539 | |
366de0ce NS |
5540 | /* Set the TYPE_CONTEXTs for each tagged type which is local to |
5541 | the formal parameter list of this FUNCTION_TYPE to point to | |
5542 | the FUNCTION_TYPE node itself. */ | |
e0c9fbb7 | 5543 | { |
366de0ce | 5544 | tree link; |
c22cacf3 | 5545 | |
f8893e47 | 5546 | for (link = arg_info->tags; |
366de0ce NS |
5547 | link; |
5548 | link = TREE_CHAIN (link)) | |
5549 | TYPE_CONTEXT (TREE_VALUE (link)) = type; | |
e0c9fbb7 | 5550 | } |
366de0ce NS |
5551 | break; |
5552 | } | |
f8893e47 | 5553 | case cdk_pointer: |
51e29401 | 5554 | { |
366de0ce NS |
5555 | /* Merge any constancy or volatility into the target type |
5556 | for the pointer. */ | |
51e29401 | 5557 | |
366de0ce NS |
5558 | if (pedantic && TREE_CODE (type) == FUNCTION_TYPE |
5559 | && type_quals) | |
c2255bc4 | 5560 | pedwarn (loc, OPT_pedantic, |
509c9d60 | 5561 | "ISO C forbids qualified function types"); |
366de0ce NS |
5562 | if (type_quals) |
5563 | type = c_build_qualified_type (type, type_quals); | |
f9551830 | 5564 | size_varies = false; |
3b53cddc | 5565 | |
706c4bb7 OH |
5566 | /* When the pointed-to type involves components of variable size, |
5567 | care must be taken to ensure that the size evaluation code is | |
5568 | emitted early enough to dominate all the possible later uses | |
5569 | and late enough for the variables on which it depends to have | |
5570 | been assigned. | |
5571 | ||
5572 | This is expected to happen automatically when the pointed-to | |
5573 | type has a name/declaration of it's own, but special attention | |
5574 | is required if the type is anonymous. | |
5575 | ||
5576 | We handle the NORMAL and FIELD contexts here by attaching an | |
5577 | artificial TYPE_DECL to such pointed-to type. This forces the | |
5578 | sizes evaluation at a safe point and ensures it is not deferred | |
5579 | until e.g. within a deeper conditional context. | |
5580 | ||
5581 | We expect nothing to be needed here for PARM or TYPENAME. | |
5582 | Pushing a TYPE_DECL at this point for TYPENAME would actually | |
5583 | be incorrect, as we might be in the middle of an expression | |
5584 | with side effects on the pointed-to type size "arguments" prior | |
5585 | to the pointer declaration point and the fake TYPE_DECL in the | |
5586 | enclosing context would force the size evaluation prior to the | |
5587 | side effects. */ | |
5588 | ||
5589 | if (!TYPE_NAME (type) | |
5590 | && (decl_context == NORMAL || decl_context == FIELD) | |
5591 | && variably_modified_type_p (type, NULL_TREE)) | |
5592 | { | |
c2255bc4 | 5593 | tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type); |
706c4bb7 OH |
5594 | DECL_ARTIFICIAL (decl) = 1; |
5595 | pushdecl (decl); | |
c2255bc4 | 5596 | finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE); |
706c4bb7 OH |
5597 | TYPE_NAME (type) = decl; |
5598 | } | |
5599 | ||
366de0ce | 5600 | type = build_pointer_type (type); |
c22cacf3 | 5601 | |
deb176fa JM |
5602 | /* Process type qualifiers (such as const or volatile) |
5603 | that were given inside the `*'. */ | |
3b53cddc | 5604 | type_quals = declarator->u.pointer_quals; |
deb176fa | 5605 | |
f8893e47 | 5606 | declarator = declarator->declarator; |
366de0ce | 5607 | break; |
51e29401 | 5608 | } |
366de0ce NS |
5609 | default: |
5610 | gcc_unreachable (); | |
51e29401 | 5611 | } |
51e29401 | 5612 | } |
b9baeecd | 5613 | *decl_attrs = chainon (returned_attrs, *decl_attrs); |
51e29401 | 5614 | |
46df2823 JM |
5615 | /* Now TYPE has the actual type, apart from any qualifiers in |
5616 | TYPE_QUALS. */ | |
51e29401 | 5617 | |
36c5e70a BE |
5618 | /* Warn about address space used for things other than static memory or |
5619 | pointers. */ | |
5620 | address_space = DECODE_QUAL_ADDR_SPACE (type_quals); | |
5621 | if (!ADDR_SPACE_GENERIC_P (address_space)) | |
5622 | { | |
5623 | if (decl_context == NORMAL) | |
5624 | { | |
5625 | switch (storage_class) | |
5626 | { | |
5627 | case csc_auto: | |
5628 | error ("%qs combined with %<auto%> qualifier for %qE", | |
5629 | c_addr_space_name (address_space), name); | |
5630 | break; | |
5631 | case csc_register: | |
5632 | error ("%qs combined with %<register%> qualifier for %qE", | |
5633 | c_addr_space_name (address_space), name); | |
5634 | break; | |
5635 | case csc_none: | |
5636 | if (current_function_scope) | |
5637 | { | |
5638 | error ("%qs specified for auto variable %qE", | |
5639 | c_addr_space_name (address_space), name); | |
5640 | break; | |
5641 | } | |
5642 | break; | |
5643 | case csc_static: | |
5644 | case csc_extern: | |
5645 | case csc_typedef: | |
5646 | break; | |
5647 | default: | |
5648 | gcc_unreachable (); | |
5649 | } | |
5650 | } | |
5651 | else if (decl_context == PARM && TREE_CODE (type) != ARRAY_TYPE) | |
5652 | { | |
5653 | if (name) | |
5654 | error ("%qs specified for parameter %qE", | |
5655 | c_addr_space_name (address_space), name); | |
5656 | else | |
5657 | error ("%qs specified for unnamed parameter", | |
5658 | c_addr_space_name (address_space)); | |
5659 | } | |
5660 | else if (decl_context == FIELD) | |
5661 | { | |
5662 | if (name) | |
5663 | error ("%qs specified for structure field %qE", | |
5664 | c_addr_space_name (address_space), name); | |
5665 | else | |
5666 | error ("%qs specified for structure field", | |
5667 | c_addr_space_name (address_space)); | |
5668 | } | |
5669 | } | |
5670 | ||
d134f39e JM |
5671 | /* Check the type and width of a bit-field. */ |
5672 | if (bitfield) | |
88388a52 | 5673 | check_bitfield_type_and_width (&type, width, name); |
d134f39e | 5674 | |
e9a25f70 JL |
5675 | /* Did array size calculations overflow? */ |
5676 | ||
5677 | if (TREE_CODE (type) == ARRAY_TYPE | |
d0f062fb | 5678 | && COMPLETE_TYPE_P (type) |
9bc2a5cb | 5679 | && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST |
355a9e43 | 5680 | && TREE_OVERFLOW (TYPE_SIZE_UNIT (type))) |
68940175 | 5681 | { |
88388a52 | 5682 | if (name) |
c2255bc4 | 5683 | error_at (loc, "size of array %qE is too large", name); |
88388a52 | 5684 | else |
c2255bc4 | 5685 | error_at (loc, "size of unnamed array is too large"); |
684d9f3b | 5686 | /* If we proceed with the array type as it is, we'll eventually |
68940175 AO |
5687 | crash in tree_low_cst(). */ |
5688 | type = error_mark_node; | |
5689 | } | |
e9a25f70 | 5690 | |
51e29401 RS |
5691 | /* If this is declaring a typedef name, return a TYPE_DECL. */ |
5692 | ||
9a26d6ee | 5693 | if (storage_class == csc_typedef) |
51e29401 RS |
5694 | { |
5695 | tree decl; | |
51e29401 | 5696 | if (pedantic && TREE_CODE (type) == FUNCTION_TYPE |
3932261a | 5697 | && type_quals) |
c2255bc4 | 5698 | pedwarn (loc, OPT_pedantic, |
509c9d60 | 5699 | "ISO C forbids qualified function types"); |
3932261a MM |
5700 | if (type_quals) |
5701 | type = c_build_qualified_type (type, type_quals); | |
c2255bc4 AH |
5702 | decl = build_decl (declarator->id_loc, |
5703 | TYPE_DECL, declarator->u.id, type); | |
98c3a782 | 5704 | if (declspecs->explicit_signed_p) |
51e29401 | 5705 | C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1; |
61f4f1cc | 5706 | if (declspecs->inline_p) |
c2255bc4 | 5707 | pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl); |
7e5487a2 ILT |
5708 | |
5709 | if (warn_cxx_compat && declarator->u.id != NULL_TREE) | |
5710 | { | |
5711 | struct c_binding *b = I_TAG_BINDING (declarator->u.id); | |
5712 | ||
5713 | if (b != NULL | |
5714 | && b->decl != NULL_TREE | |
5715 | && (B_IN_CURRENT_SCOPE (b) | |
5716 | || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b))) | |
5717 | && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type)) | |
5718 | { | |
5719 | warning_at (declarator->id_loc, OPT_Wc___compat, | |
5720 | ("using %qD as both a typedef and a tag is " | |
5721 | "invalid in C++"), | |
5722 | decl); | |
5723 | if (b->locus != UNKNOWN_LOCATION) | |
5724 | inform (b->locus, "originally defined here"); | |
5725 | } | |
5726 | } | |
5727 | ||
51e29401 RS |
5728 | return decl; |
5729 | } | |
5730 | ||
51e29401 RS |
5731 | /* If this is a type name (such as, in a cast or sizeof), |
5732 | compute the type and return it now. */ | |
5733 | ||
5734 | if (decl_context == TYPENAME) | |
5735 | { | |
61f4f1cc JM |
5736 | /* Note that the grammar rejects storage classes in typenames |
5737 | and fields. */ | |
5738 | gcc_assert (storage_class == csc_none && !threadp | |
5739 | && !declspecs->inline_p); | |
51e29401 | 5740 | if (pedantic && TREE_CODE (type) == FUNCTION_TYPE |
3932261a | 5741 | && type_quals) |
c2255bc4 | 5742 | pedwarn (loc, OPT_pedantic, |
509c9d60 | 5743 | "ISO C forbids const or volatile function types"); |
3932261a MM |
5744 | if (type_quals) |
5745 | type = c_build_qualified_type (type, type_quals); | |
51e29401 RS |
5746 | return type; |
5747 | } | |
5748 | ||
52ffd86e MS |
5749 | if (pedantic && decl_context == FIELD |
5750 | && variably_modified_type_p (type, NULL_TREE)) | |
5751 | { | |
5752 | /* C99 6.7.2.1p8 */ | |
c2255bc4 AH |
5753 | pedwarn (loc, OPT_pedantic, "a member of a structure or union cannot " |
5754 | "have a variably modified type"); | |
52ffd86e MS |
5755 | } |
5756 | ||
61df2ee2 RS |
5757 | /* Aside from typedefs and type names (handle above), |
5758 | `void' at top level (not within pointer) | |
5759 | is allowed only in public variables. | |
51e29401 RS |
5760 | We don't complain about parms either, but that is because |
5761 | a better error message can be made later. */ | |
5762 | ||
71653180 | 5763 | if (VOID_TYPE_P (type) && decl_context != PARM |
3f75a254 | 5764 | && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE) |
9a26d6ee | 5765 | && (storage_class == csc_extern |
f75fbaf7 | 5766 | || (current_scope == file_scope |
9a26d6ee JM |
5767 | && !(storage_class == csc_static |
5768 | || storage_class == csc_register))))) | |
51e29401 | 5769 | { |
c2255bc4 | 5770 | error_at (loc, "variable or field %qE declared void", name); |
51e29401 RS |
5771 | type = integer_type_node; |
5772 | } | |
5773 | ||
5774 | /* Now create the decl, which may be a VAR_DECL, a PARM_DECL | |
5775 | or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */ | |
5776 | ||
5777 | { | |
91d231cb | 5778 | tree decl; |
51e29401 RS |
5779 | |
5780 | if (decl_context == PARM) | |
5781 | { | |
c530479e | 5782 | tree promoted_type; |
51e29401 RS |
5783 | |
5784 | /* A parameter declared as an array of T is really a pointer to T. | |
5785 | One declared as a function is really a pointer to a function. */ | |
5786 | ||
5787 | if (TREE_CODE (type) == ARRAY_TYPE) | |
5788 | { | |
5789 | /* Transfer const-ness of array into that of type pointed to. */ | |
eaf2e788 | 5790 | type = TREE_TYPE (type); |
3932261a MM |
5791 | if (type_quals) |
5792 | type = c_build_qualified_type (type, type_quals); | |
eaf2e788 | 5793 | type = build_pointer_type (type); |
3b53cddc | 5794 | type_quals = array_ptr_quals; |
b09869ff JM |
5795 | if (type_quals) |
5796 | type = c_build_qualified_type (type, type_quals); | |
0e03329a | 5797 | |
3b53cddc JM |
5798 | /* We don't yet implement attributes in this context. */ |
5799 | if (array_ptr_attrs != NULL_TREE) | |
c2255bc4 AH |
5800 | warning_at (loc, OPT_Wattributes, |
5801 | "attributes in parameter array declarator ignored"); | |
0e03329a | 5802 | |
f9551830 | 5803 | size_varies = false; |
51e29401 RS |
5804 | } |
5805 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
5806 | { | |
fcf73884 | 5807 | if (type_quals) |
c2255bc4 | 5808 | pedwarn (loc, OPT_pedantic, |
509c9d60 | 5809 | "ISO C forbids qualified function types"); |
3932261a MM |
5810 | if (type_quals) |
5811 | type = c_build_qualified_type (type, type_quals); | |
eaf2e788 | 5812 | type = build_pointer_type (type); |
3932261a | 5813 | type_quals = TYPE_UNQUALIFIED; |
51e29401 | 5814 | } |
0f38b811 MM |
5815 | else if (type_quals) |
5816 | type = c_build_qualified_type (type, type_quals); | |
35b1a6fa | 5817 | |
c2255bc4 AH |
5818 | decl = build_decl (declarator->id_loc, |
5819 | PARM_DECL, declarator->u.id, type); | |
929f3671 | 5820 | if (size_varies) |
51e29401 RS |
5821 | C_DECL_VARIABLE_SIZE (decl) = 1; |
5822 | ||
5823 | /* Compute the type actually passed in the parmlist, | |
5824 | for the case where there is no prototype. | |
5825 | (For example, shorts and chars are passed as ints.) | |
5826 | When there is a prototype, this is overridden later. */ | |
5827 | ||
c530479e RH |
5828 | if (type == error_mark_node) |
5829 | promoted_type = type; | |
5830 | else | |
ab393bf1 | 5831 | promoted_type = c_type_promotes_to (type); |
51e29401 | 5832 | |
c530479e | 5833 | DECL_ARG_TYPE (decl) = promoted_type; |
61f4f1cc | 5834 | if (declspecs->inline_p) |
c2255bc4 | 5835 | pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl); |
51e29401 RS |
5836 | } |
5837 | else if (decl_context == FIELD) | |
5838 | { | |
61f4f1cc JM |
5839 | /* Note that the grammar rejects storage classes in typenames |
5840 | and fields. */ | |
5841 | gcc_assert (storage_class == csc_none && !threadp | |
5842 | && !declspecs->inline_p); | |
5843 | ||
51e29401 | 5844 | /* Structure field. It may not be a function. */ |
dfd48d76 | 5845 | |
51e29401 RS |
5846 | if (TREE_CODE (type) == FUNCTION_TYPE) |
5847 | { | |
c2255bc4 | 5848 | error_at (loc, "field %qE declared as a function", name); |
51e29401 RS |
5849 | type = build_pointer_type (type); |
5850 | } | |
d0f062fb | 5851 | else if (TREE_CODE (type) != ERROR_MARK |
c22cacf3 | 5852 | && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type)) |
51e29401 | 5853 | { |
1202aec1 | 5854 | if (name) |
c2255bc4 | 5855 | error_at (loc, "field %qE has incomplete type", name); |
1202aec1 | 5856 | else |
c2255bc4 | 5857 | error_at (loc, "unnamed field has incomplete type"); |
51e29401 RS |
5858 | type = error_mark_node; |
5859 | } | |
46df2823 | 5860 | type = c_build_qualified_type (type, type_quals); |
c2255bc4 AH |
5861 | decl = build_decl (declarator->id_loc, |
5862 | FIELD_DECL, declarator->u.id, type); | |
2bf105ab | 5863 | DECL_NONADDRESSABLE_P (decl) = bitfield; |
ab53bae2 AO |
5864 | if (bitfield && !declarator->u.id) |
5865 | TREE_NO_WARNING (decl) = 1; | |
2bf105ab | 5866 | |
929f3671 | 5867 | if (size_varies) |
51e29401 RS |
5868 | C_DECL_VARIABLE_SIZE (decl) = 1; |
5869 | } | |
5870 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
5871 | { | |
9a26d6ee | 5872 | if (storage_class == csc_register || threadp) |
1ac0ac8b | 5873 | { |
c2255bc4 | 5874 | error_at (loc, "invalid storage class for function %qE", name); |
1ac0ac8b | 5875 | } |
ff164b22 GK |
5876 | else if (current_scope != file_scope) |
5877 | { | |
5878 | /* Function declaration not at file scope. Storage | |
5879 | classes other than `extern' are not allowed, C99 | |
5880 | 6.7.1p5, and `extern' makes no difference. However, | |
5881 | GCC allows 'auto', perhaps with 'inline', to support | |
5882 | nested functions. */ | |
9a26d6ee | 5883 | if (storage_class == csc_auto) |
c2255bc4 | 5884 | pedwarn (loc, OPT_pedantic, |
88388a52 | 5885 | "invalid storage class for function %qE", name); |
6f17bbcf | 5886 | else if (storage_class == csc_static) |
1ac0ac8b | 5887 | { |
c2255bc4 | 5888 | error_at (loc, "invalid storage class for function %qE", name); |
c22cacf3 | 5889 | if (funcdef_flag) |
6f17bbcf JM |
5890 | storage_class = declspecs->storage_class = csc_none; |
5891 | else | |
5892 | return 0; | |
1ac0ac8b | 5893 | } |
ff164b22 | 5894 | } |
fd0b8fce | 5895 | |
c2255bc4 AH |
5896 | decl = build_decl (declarator->id_loc, |
5897 | FUNCTION_DECL, declarator->u.id, type); | |
6f17bbcf JM |
5898 | decl = build_decl_attribute_variant (decl, decl_attr); |
5899 | ||
3f75a254 | 5900 | if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl)) |
c2255bc4 | 5901 | pedwarn (loc, OPT_pedantic, |
fcf73884 | 5902 | "ISO C forbids qualified function types"); |
51e29401 | 5903 | |
9affb2c7 ZW |
5904 | /* Every function declaration is an external reference |
5905 | (DECL_EXTERNAL) except for those which are not at file | |
5906 | scope and are explicitly declared "auto". This is | |
5907 | forbidden by standard C (C99 6.7.1p5) and is interpreted by | |
5908 | GCC to signify a forward declaration of a nested function. */ | |
9a26d6ee | 5909 | if (storage_class == csc_auto && current_scope != file_scope) |
9affb2c7 | 5910 | DECL_EXTERNAL (decl) = 0; |
71113fcd GK |
5911 | /* In C99, a function which is declared 'inline' with 'extern' |
5912 | is not an external reference (which is confusing). It | |
5913 | means that the later definition of the function must be output | |
5914 | in this file, C99 6.7.4p6. In GNU C89, a function declared | |
5915 | 'extern inline' is an external reference. */ | |
5916 | else if (declspecs->inline_p && storage_class != csc_static) | |
da1c7394 ILT |
5917 | DECL_EXTERNAL (decl) = ((storage_class == csc_extern) |
5918 | == flag_gnu89_inline); | |
9affb2c7 | 5919 | else |
71113fcd | 5920 | DECL_EXTERNAL (decl) = !initialized; |
caf93cb0 | 5921 | |
51e29401 RS |
5922 | /* Record absence of global scope for `static' or `auto'. */ |
5923 | TREE_PUBLIC (decl) | |
9a26d6ee | 5924 | = !(storage_class == csc_static || storage_class == csc_auto); |
c40f7b33 | 5925 | |
77dbdb57 | 5926 | /* For a function definition, record the argument information |
7b112487 | 5927 | block where store_parm_decls will look for it. */ |
77dbdb57 | 5928 | if (funcdef_flag) |
7b112487 | 5929 | current_function_arg_info = arg_info; |
77dbdb57 | 5930 | |
98c3a782 | 5931 | if (declspecs->default_int_p) |
5ce89b2e JM |
5932 | C_FUNCTION_IMPLICIT_INT (decl) = 1; |
5933 | ||
51e29401 | 5934 | /* Record presence of `inline', if it is reasonable. */ |
61f4f1cc | 5935 | if (flag_hosted && MAIN_NAME_P (declarator->u.id)) |
51e29401 | 5936 | { |
9a26d6ee | 5937 | if (declspecs->inline_p) |
c2255bc4 | 5938 | pedwarn (loc, 0, "cannot inline function %<main%>"); |
31ed8fea | 5939 | } |
9a26d6ee | 5940 | else if (declspecs->inline_p) |
54dfd46b JH |
5941 | /* Record that the function is declared `inline'. */ |
5942 | DECL_DECLARED_INLINE_P (decl) = 1; | |
51e29401 RS |
5943 | } |
5944 | else | |
5945 | { | |
5946 | /* It's a variable. */ | |
fd0b8fce | 5947 | /* An uninitialized decl with `extern' is a reference. */ |
9a26d6ee | 5948 | int extern_ref = !initialized && storage_class == csc_extern; |
51e29401 | 5949 | |
46df2823 | 5950 | type = c_build_qualified_type (type, type_quals); |
f4e92987 | 5951 | |
f75fbaf7 ZW |
5952 | /* C99 6.2.2p7: It is invalid (compile-time undefined |
5953 | behavior) to create an 'extern' declaration for a | |
f4e92987 | 5954 | variable if there is a global declaration that is |
f75fbaf7 ZW |
5955 | 'static' and the global declaration is not visible. |
5956 | (If the static declaration _is_ currently visible, | |
5957 | the 'extern' declaration is taken to refer to that decl.) */ | |
5958 | if (extern_ref && current_scope != file_scope) | |
f4e92987 | 5959 | { |
f8893e47 JM |
5960 | tree global_decl = identifier_global_value (declarator->u.id); |
5961 | tree visible_decl = lookup_name (declarator->u.id); | |
f4e92987 | 5962 | |
35b1a6fa | 5963 | if (global_decl |
f75fbaf7 | 5964 | && global_decl != visible_decl |
f4e92987 MM |
5965 | && TREE_CODE (global_decl) == VAR_DECL |
5966 | && !TREE_PUBLIC (global_decl)) | |
c2255bc4 AH |
5967 | error_at (loc, "variable previously declared %<static%> " |
5968 | "redeclared %<extern%>"); | |
f4e92987 MM |
5969 | } |
5970 | ||
c2255bc4 AH |
5971 | decl = build_decl (declarator->id_loc, |
5972 | VAR_DECL, declarator->u.id, type); | |
929f3671 | 5973 | if (size_varies) |
51e29401 RS |
5974 | C_DECL_VARIABLE_SIZE (decl) = 1; |
5975 | ||
9a26d6ee | 5976 | if (declspecs->inline_p) |
c2255bc4 | 5977 | pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl); |
51e29401 | 5978 | |
bbbcb2e1 JM |
5979 | /* At file scope, an initialized extern declaration may follow |
5980 | a static declaration. In that case, DECL_EXTERNAL will be | |
5981 | reset later in start_decl. */ | |
9a26d6ee | 5982 | DECL_EXTERNAL (decl) = (storage_class == csc_extern); |
3d78f2e9 | 5983 | |
f8521984 | 5984 | /* At file scope, the presence of a `static' or `register' storage |
ee534ebf RS |
5985 | class specifier, or the absence of all storage class specifiers |
5986 | makes this declaration a definition (perhaps tentative). Also, | |
fcc207bf | 5987 | the absence of `static' makes it public. */ |
f75fbaf7 | 5988 | if (current_scope == file_scope) |
51e29401 | 5989 | { |
fcc207bf | 5990 | TREE_PUBLIC (decl) = storage_class != csc_static; |
3d78f2e9 | 5991 | TREE_STATIC (decl) = !extern_ref; |
51e29401 | 5992 | } |
f8521984 | 5993 | /* Not at file scope, only `static' makes a static definition. */ |
51e29401 RS |
5994 | else |
5995 | { | |
9a26d6ee | 5996 | TREE_STATIC (decl) = (storage_class == csc_static); |
3d78f2e9 RH |
5997 | TREE_PUBLIC (decl) = extern_ref; |
5998 | } | |
5999 | ||
9a26d6ee | 6000 | if (threadp) |
8893239d | 6001 | DECL_TLS_MODEL (decl) = decl_default_tls_model (decl); |
51e29401 RS |
6002 | } |
6003 | ||
92f6fd0b JM |
6004 | if ((storage_class == csc_extern |
6005 | || (storage_class == csc_none | |
6006 | && TREE_CODE (type) == FUNCTION_TYPE | |
6007 | && !funcdef_flag)) | |
52ffd86e MS |
6008 | && variably_modified_type_p (type, NULL_TREE)) |
6009 | { | |
6010 | /* C99 6.7.5.2p2 */ | |
92f6fd0b | 6011 | if (TREE_CODE (type) == FUNCTION_TYPE) |
c2255bc4 | 6012 | error_at (loc, "non-nested function with variably modified type"); |
92f6fd0b | 6013 | else |
c2255bc4 AH |
6014 | error_at (loc, "object with variably modified type must have " |
6015 | "no linkage"); | |
52ffd86e MS |
6016 | } |
6017 | ||
51e29401 RS |
6018 | /* Record `register' declaration for warnings on & |
6019 | and in case doing stupid register allocation. */ | |
6020 | ||
9a26d6ee | 6021 | if (storage_class == csc_register) |
5baeaac0 JM |
6022 | { |
6023 | C_DECL_REGISTER (decl) = 1; | |
6024 | DECL_REGISTER (decl) = 1; | |
6025 | } | |
51e29401 RS |
6026 | |
6027 | /* Record constancy and volatility. */ | |
3932261a | 6028 | c_apply_type_quals_to_decl (type_quals, decl); |
51e29401 | 6029 | |
51e29401 RS |
6030 | /* If a type has volatile components, it should be stored in memory. |
6031 | Otherwise, the fact that those components are volatile | |
820cc88f DB |
6032 | will be ignored, and would even crash the compiler. |
6033 | Of course, this only makes sense on VAR,PARM, and RESULT decl's. */ | |
6034 | if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)) | |
6035 | && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL | |
6036 | || TREE_CODE (decl) == RESULT_DECL)) | |
5baeaac0 JM |
6037 | { |
6038 | /* It is not an error for a structure with volatile fields to | |
6039 | be declared register, but reset DECL_REGISTER since it | |
6040 | cannot actually go in a register. */ | |
6041 | int was_reg = C_DECL_REGISTER (decl); | |
6042 | C_DECL_REGISTER (decl) = 0; | |
6043 | DECL_REGISTER (decl) = 0; | |
6044 | c_mark_addressable (decl); | |
6045 | C_DECL_REGISTER (decl) = was_reg; | |
6046 | } | |
51e29401 | 6047 | |
d05cc98e GK |
6048 | /* This is the earliest point at which we might know the assembler |
6049 | name of a variable. Thus, if it's known before this, die horribly. */ | |
366de0ce | 6050 | gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl)); |
d05cc98e | 6051 | |
88eeff6f ILT |
6052 | if (warn_cxx_compat |
6053 | && TREE_CODE (decl) == VAR_DECL | |
6054 | && TREE_PUBLIC (decl) | |
6055 | && TREE_STATIC (decl) | |
6056 | && (TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE | |
6057 | || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE | |
6058 | || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE) | |
6059 | && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE) | |
6060 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat, | |
6061 | ("non-local variable %qD with anonymous type is " | |
6062 | "questionable in C++"), | |
6063 | decl); | |
6064 | ||
51e29401 RS |
6065 | return decl; |
6066 | } | |
6067 | } | |
6068 | \f | |
51e29401 | 6069 | /* Decode the parameter-list info for a function type or function definition. |
52ffd86e | 6070 | The argument is the value returned by `get_parm_info' (or made in c-parse.c |
51e29401 RS |
6071 | if there is an identifier list instead of a parameter decl list). |
6072 | These two functions are separate because when a function returns | |
6073 | or receives functions then each is called multiple times but the order | |
6074 | of calls is different. The last call to `grokparms' is always the one | |
6075 | that contains the formal parameter names of a function definition. | |
6076 | ||
51e29401 RS |
6077 | Return a list of arg types to use in the FUNCTION_TYPE for this function. |
6078 | ||
60919bce | 6079 | FUNCDEF_FLAG is true for a function definition, false for |
51e29401 | 6080 | a mere declaration. A nonempty identifier-list gets an error message |
60919bce | 6081 | when FUNCDEF_FLAG is false. */ |
51e29401 RS |
6082 | |
6083 | static tree | |
f8893e47 | 6084 | grokparms (struct c_arg_info *arg_info, bool funcdef_flag) |
51e29401 | 6085 | { |
f8893e47 | 6086 | tree arg_types = arg_info->types; |
51e29401 | 6087 | |
52ffd86e MS |
6088 | if (funcdef_flag && arg_info->had_vla_unspec) |
6089 | { | |
6090 | /* A function definition isn't function prototype scope C99 6.2.1p4. */ | |
6091 | /* C99 6.7.5.2p4 */ | |
6092 | error ("%<[*]%> not allowed in other than function prototype scope"); | |
6093 | } | |
6094 | ||
3176a0c2 DD |
6095 | if (arg_types == 0 && !funcdef_flag && !in_system_header) |
6096 | warning (OPT_Wstrict_prototypes, | |
6097 | "function declaration isn%'t a prototype"); | |
51e29401 | 6098 | |
f75fbaf7 ZW |
6099 | if (arg_types == error_mark_node) |
6100 | return 0; /* don't set TYPE_ARG_TYPES in this case */ | |
6101 | ||
6102 | else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE) | |
51e29401 | 6103 | { |
3f75a254 | 6104 | if (!funcdef_flag) |
509c9d60 | 6105 | pedwarn (input_location, 0, "parameter names (without types) in function declaration"); |
51e29401 | 6106 | |
f8893e47 JM |
6107 | arg_info->parms = arg_info->types; |
6108 | arg_info->types = 0; | |
51e29401 RS |
6109 | return 0; |
6110 | } | |
6111 | else | |
6112 | { | |
77dbdb57 ZW |
6113 | tree parm, type, typelt; |
6114 | unsigned int parmno; | |
40449a90 | 6115 | const char *errmsg; |
77dbdb57 | 6116 | |
bba5733f JM |
6117 | /* If there is a parameter of incomplete type in a definition, |
6118 | this is an error. In a declaration this is valid, and a | |
6119 | struct or union type may be completed later, before any calls | |
6120 | or definition of the function. In the case where the tag was | |
6121 | first declared within the parameter list, a warning has | |
6122 | already been given. If a parameter has void type, then | |
6123 | however the function cannot be defined or called, so | |
6124 | warn. */ | |
77dbdb57 | 6125 | |
f8893e47 | 6126 | for (parm = arg_info->parms, typelt = arg_types, parmno = 1; |
eb1dfbb2 | 6127 | parm; |
77dbdb57 ZW |
6128 | parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++) |
6129 | { | |
6130 | type = TREE_VALUE (typelt); | |
6131 | if (type == error_mark_node) | |
6132 | continue; | |
6133 | ||
6134 | if (!COMPLETE_TYPE_P (type)) | |
6135 | { | |
6136 | if (funcdef_flag) | |
6137 | { | |
6138 | if (DECL_NAME (parm)) | |
c5d75364 MLI |
6139 | error_at (input_location, |
6140 | "parameter %u (%q+D) has incomplete type", | |
6141 | parmno, parm); | |
77dbdb57 | 6142 | else |
c5d75364 MLI |
6143 | error_at (DECL_SOURCE_LOCATION (parm), |
6144 | "parameter %u has incomplete type", | |
6145 | parmno); | |
51e29401 | 6146 | |
77dbdb57 ZW |
6147 | TREE_VALUE (typelt) = error_mark_node; |
6148 | TREE_TYPE (parm) = error_mark_node; | |
e49a760f | 6149 | arg_types = NULL_TREE; |
77dbdb57 | 6150 | } |
bba5733f | 6151 | else if (VOID_TYPE_P (type)) |
77dbdb57 ZW |
6152 | { |
6153 | if (DECL_NAME (parm)) | |
c5d75364 MLI |
6154 | warning_at (input_location, 0, |
6155 | "parameter %u (%q+D) has void type", | |
6156 | parmno, parm); | |
77dbdb57 | 6157 | else |
c5d75364 MLI |
6158 | warning_at (DECL_SOURCE_LOCATION (parm), 0, |
6159 | "parameter %u has void type", | |
6160 | parmno); | |
77dbdb57 ZW |
6161 | } |
6162 | } | |
7c47d6e9 | 6163 | |
40449a90 SL |
6164 | errmsg = targetm.invalid_parameter_type (type); |
6165 | if (errmsg) | |
6166 | { | |
6167 | error (errmsg); | |
6168 | TREE_VALUE (typelt) = error_mark_node; | |
6169 | TREE_TYPE (parm) = error_mark_node; | |
e49a760f | 6170 | arg_types = NULL_TREE; |
40449a90 SL |
6171 | } |
6172 | ||
7c47d6e9 JM |
6173 | if (DECL_NAME (parm) && TREE_USED (parm)) |
6174 | warn_if_shadowing (parm); | |
77dbdb57 ZW |
6175 | } |
6176 | return arg_types; | |
51e29401 RS |
6177 | } |
6178 | } | |
6179 | ||
f8893e47 JM |
6180 | /* Take apart the current scope and return a c_arg_info structure with |
6181 | info on a parameter list just parsed. | |
77dbdb57 | 6182 | |
f8893e47 | 6183 | This structure is later fed to 'grokparms' and 'store_parm_decls'. |
51e29401 | 6184 | |
f75fbaf7 ZW |
6185 | ELLIPSIS being true means the argument list ended in '...' so don't |
6186 | append a sentinel (void_list_node) to the end of the type-list. */ | |
51e29401 | 6187 | |
f8893e47 | 6188 | struct c_arg_info * |
f75fbaf7 | 6189 | get_parm_info (bool ellipsis) |
51e29401 | 6190 | { |
f75fbaf7 | 6191 | struct c_binding *b = current_scope->bindings; |
f8893e47 JM |
6192 | struct c_arg_info *arg_info = XOBNEW (&parser_obstack, |
6193 | struct c_arg_info); | |
f75fbaf7 ZW |
6194 | tree parms = 0; |
6195 | tree tags = 0; | |
6196 | tree types = 0; | |
6197 | tree others = 0; | |
6198 | ||
55d54003 ZW |
6199 | static bool explained_incomplete_types = false; |
6200 | bool gave_void_only_once_err = false; | |
6201 | ||
f8893e47 JM |
6202 | arg_info->parms = 0; |
6203 | arg_info->tags = 0; | |
6204 | arg_info->types = 0; | |
6205 | arg_info->others = 0; | |
3542a5c0 | 6206 | arg_info->pending_sizes = 0; |
52ffd86e | 6207 | arg_info->had_vla_unspec = current_scope->had_vla_unspec; |
f8893e47 | 6208 | |
f75fbaf7 ZW |
6209 | /* The bindings in this scope must not get put into a block. |
6210 | We will take care of deleting the binding nodes. */ | |
6211 | current_scope->bindings = 0; | |
51e29401 | 6212 | |
f75fbaf7 ZW |
6213 | /* This function is only called if there was *something* on the |
6214 | parameter list. */ | |
366de0ce | 6215 | gcc_assert (b); |
55d54003 | 6216 | |
f75fbaf7 ZW |
6217 | /* A parameter list consisting solely of 'void' indicates that the |
6218 | function takes no arguments. But if the 'void' is qualified | |
6219 | (by 'const' or 'volatile'), or has a storage class specifier | |
6220 | ('register'), then the behavior is undefined; issue an error. | |
6221 | Typedefs for 'void' are OK (see DR#157). */ | |
c22cacf3 | 6222 | if (b->prev == 0 /* one binding */ |
f75fbaf7 ZW |
6223 | && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */ |
6224 | && !DECL_NAME (b->decl) /* anonymous */ | |
6225 | && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */ | |
6226 | { | |
6227 | if (TREE_THIS_VOLATILE (b->decl) | |
6228 | || TREE_READONLY (b->decl) | |
5baeaac0 | 6229 | || C_DECL_REGISTER (b->decl)) |
bda67431 | 6230 | error ("%<void%> as only parameter may not be qualified"); |
55d54003 | 6231 | |
f75fbaf7 ZW |
6232 | /* There cannot be an ellipsis. */ |
6233 | if (ellipsis) | |
bda67431 | 6234 | error ("%<void%> must be the only parameter"); |
51e29401 | 6235 | |
f8893e47 | 6236 | arg_info->types = void_list_node; |
f75fbaf7 | 6237 | return arg_info; |
51e29401 RS |
6238 | } |
6239 | ||
f75fbaf7 ZW |
6240 | if (!ellipsis) |
6241 | types = void_list_node; | |
51e29401 | 6242 | |
f75fbaf7 ZW |
6243 | /* Break up the bindings list into parms, tags, types, and others; |
6244 | apply sanity checks; purge the name-to-decl bindings. */ | |
6245 | while (b) | |
51e29401 | 6246 | { |
f75fbaf7 ZW |
6247 | tree decl = b->decl; |
6248 | tree type = TREE_TYPE (decl); | |
55d54003 | 6249 | const char *keyword; |
55d54003 | 6250 | |
f75fbaf7 | 6251 | switch (TREE_CODE (decl)) |
6645c3fa | 6252 | { |
f75fbaf7 ZW |
6253 | case PARM_DECL: |
6254 | if (b->id) | |
6255 | { | |
366de0ce | 6256 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); |
f75fbaf7 ZW |
6257 | I_SYMBOL_BINDING (b->id) = b->shadowed; |
6258 | } | |
55d54003 | 6259 | |
f75fbaf7 ZW |
6260 | /* Check for forward decls that never got their actual decl. */ |
6261 | if (TREE_ASM_WRITTEN (decl)) | |
dee15844 | 6262 | error ("parameter %q+D has just a forward declaration", decl); |
f75fbaf7 ZW |
6263 | /* Check for (..., void, ...) and issue an error. */ |
6264 | else if (VOID_TYPE_P (type) && !DECL_NAME (decl)) | |
6265 | { | |
6266 | if (!gave_void_only_once_err) | |
6267 | { | |
bda67431 | 6268 | error ("%<void%> must be the only parameter"); |
f75fbaf7 ZW |
6269 | gave_void_only_once_err = true; |
6270 | } | |
6271 | } | |
6272 | else | |
6273 | { | |
6274 | /* Valid parameter, add it to the list. */ | |
6275 | TREE_CHAIN (decl) = parms; | |
6276 | parms = decl; | |
6277 | ||
6278 | /* Since there is a prototype, args are passed in their | |
6279 | declared types. The back end may override this later. */ | |
6280 | DECL_ARG_TYPE (decl) = type; | |
6281 | types = tree_cons (0, type, types); | |
6282 | } | |
6283 | break; | |
55d54003 | 6284 | |
56141a6a | 6285 | case ENUMERAL_TYPE: keyword = "enum"; goto tag; |
f75fbaf7 | 6286 | case UNION_TYPE: keyword = "union"; goto tag; |
56141a6a | 6287 | case RECORD_TYPE: keyword = "struct"; goto tag; |
f75fbaf7 ZW |
6288 | tag: |
6289 | /* Types may not have tag-names, in which case the type | |
6290 | appears in the bindings list with b->id NULL. */ | |
6291 | if (b->id) | |
6292 | { | |
366de0ce | 6293 | gcc_assert (I_TAG_BINDING (b->id) == b); |
f75fbaf7 ZW |
6294 | I_TAG_BINDING (b->id) = b->shadowed; |
6295 | } | |
55d54003 | 6296 | |
f75fbaf7 ZW |
6297 | /* Warn about any struct, union or enum tags defined in a |
6298 | parameter list. The scope of such types is limited to | |
6299 | the parameter list, which is rarely if ever desirable | |
6300 | (it's impossible to call such a function with type- | |
6301 | correct arguments). An anonymous union parm type is | |
6302 | meaningful as a GNU extension, so don't warn for that. */ | |
6303 | if (TREE_CODE (decl) != UNION_TYPE || b->id != 0) | |
6304 | { | |
6305 | if (b->id) | |
6306 | /* The %s will be one of 'struct', 'union', or 'enum'. */ | |
d4ee4d25 | 6307 | warning (0, "%<%s %E%> declared inside parameter list", |
f75fbaf7 ZW |
6308 | keyword, b->id); |
6309 | else | |
6310 | /* The %s will be one of 'struct', 'union', or 'enum'. */ | |
d4ee4d25 | 6311 | warning (0, "anonymous %s declared inside parameter list", |
f75fbaf7 | 6312 | keyword); |
118a3a8b | 6313 | |
3f75a254 | 6314 | if (!explained_incomplete_types) |
f75fbaf7 | 6315 | { |
d4ee4d25 | 6316 | warning (0, "its scope is only this definition or declaration," |
f75fbaf7 ZW |
6317 | " which is probably not what you want"); |
6318 | explained_incomplete_types = true; | |
6319 | } | |
6320 | } | |
55d54003 | 6321 | |
f75fbaf7 ZW |
6322 | tags = tree_cons (b->id, decl, tags); |
6323 | break; | |
6324 | ||
6325 | case CONST_DECL: | |
6326 | case TYPE_DECL: | |
ee060229 | 6327 | case FUNCTION_DECL: |
f75fbaf7 ZW |
6328 | /* CONST_DECLs appear here when we have an embedded enum, |
6329 | and TYPE_DECLs appear here when we have an embedded struct | |
6330 | or union. No warnings for this - we already warned about the | |
ee060229 JM |
6331 | type itself. FUNCTION_DECLs appear when there is an implicit |
6332 | function declaration in the parameter list. */ | |
6333 | ||
10e76c1a JM |
6334 | /* When we reinsert this decl in the function body, we need |
6335 | to reconstruct whether it was marked as nested. */ | |
6336 | gcc_assert (TREE_CODE (decl) == FUNCTION_DECL | |
6337 | ? b->nested | |
6338 | : !b->nested); | |
18d5f982 ZW |
6339 | TREE_CHAIN (decl) = others; |
6340 | others = decl; | |
6341 | /* fall through */ | |
6342 | ||
6343 | case ERROR_MARK: | |
6344 | /* error_mark_node appears here when we have an undeclared | |
6345 | variable. Just throw it away. */ | |
f75fbaf7 ZW |
6346 | if (b->id) |
6347 | { | |
366de0ce | 6348 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); |
f75fbaf7 ZW |
6349 | I_SYMBOL_BINDING (b->id) = b->shadowed; |
6350 | } | |
f75fbaf7 ZW |
6351 | break; |
6352 | ||
6353 | /* Other things that might be encountered. */ | |
6354 | case LABEL_DECL: | |
f75fbaf7 | 6355 | case VAR_DECL: |
f75fbaf7 | 6356 | default: |
366de0ce | 6357 | gcc_unreachable (); |
f75fbaf7 ZW |
6358 | } |
6359 | ||
6360 | b = free_binding_and_advance (b); | |
55d54003 ZW |
6361 | } |
6362 | ||
f8893e47 JM |
6363 | arg_info->parms = parms; |
6364 | arg_info->tags = tags; | |
6365 | arg_info->types = types; | |
6366 | arg_info->others = others; | |
3542a5c0 | 6367 | arg_info->pending_sizes = get_pending_sizes (); |
f75fbaf7 | 6368 | return arg_info; |
51e29401 RS |
6369 | } |
6370 | \f | |
6371 | /* Get the struct, enum or union (CODE says which) with tag NAME. | |
c2255bc4 AH |
6372 | Define the tag as a forward-reference with location LOC if it is |
6373 | not defined. Return a c_typespec structure for the type | |
6374 | specifier. */ | |
51e29401 | 6375 | |
81da229b | 6376 | struct c_typespec |
c2255bc4 | 6377 | parser_xref_tag (location_t loc, enum tree_code code, tree name) |
51e29401 | 6378 | { |
81da229b | 6379 | struct c_typespec ret; |
928c19bb | 6380 | tree ref; |
24b97832 | 6381 | location_t refloc; |
928c19bb JM |
6382 | |
6383 | ret.expr = NULL_TREE; | |
6384 | ret.expr_const_operands = true; | |
6385 | ||
51e29401 RS |
6386 | /* If a cross reference is requested, look up the type |
6387 | already defined for this tag and return it. */ | |
6388 | ||
24b97832 | 6389 | ref = lookup_tag (code, name, 0, &refloc); |
f18b70f5 JM |
6390 | /* If this is the right type of tag, return what we found. |
6391 | (This reference will be shadowed by shadow_tag later if appropriate.) | |
6392 | If this is the wrong type of tag, do not return it. If it was the | |
f8521984 ZW |
6393 | wrong type in the same scope, we will have had an error |
6394 | message already; if in a different scope and declaring | |
f18b70f5 | 6395 | a name, pending_xref_error will give an error message; but if in a |
f8521984 | 6396 | different scope and not declaring a name, this tag should |
f18b70f5 JM |
6397 | shadow the previous declaration of a different type of tag, and |
6398 | this would not work properly if we return the reference found. | |
6399 | (For example, with "struct foo" in an outer scope, "union foo;" | |
6400 | must shadow that tag with a new one of union type.) */ | |
81da229b | 6401 | ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref); |
f18b70f5 | 6402 | if (ref && TREE_CODE (ref) == code) |
81da229b | 6403 | { |
24b97832 ILT |
6404 | if (C_TYPE_DEFINED_IN_STRUCT (ref) |
6405 | && loc != UNKNOWN_LOCATION | |
6406 | && warn_cxx_compat) | |
6407 | { | |
6408 | switch (code) | |
6409 | { | |
6410 | case ENUMERAL_TYPE: | |
6411 | warning_at (loc, OPT_Wc___compat, | |
6412 | ("enum type defined in struct or union " | |
6413 | "is not visible in C++")); | |
6414 | inform (refloc, "enum type defined here"); | |
6415 | break; | |
6416 | case RECORD_TYPE: | |
6417 | warning_at (loc, OPT_Wc___compat, | |
6418 | ("struct defined in struct or union " | |
6419 | "is not visible in C++")); | |
6420 | inform (refloc, "struct defined here"); | |
6421 | break; | |
6422 | case UNION_TYPE: | |
6423 | warning_at (loc, OPT_Wc___compat, | |
6424 | ("union defined in struct or union " | |
6425 | "is not visible in C++")); | |
6426 | inform (refloc, "union defined here"); | |
6427 | break; | |
6428 | default: | |
6429 | gcc_unreachable(); | |
6430 | } | |
6431 | } | |
6432 | ||
81da229b JM |
6433 | ret.spec = ref; |
6434 | return ret; | |
6435 | } | |
51e29401 | 6436 | |
51e29401 RS |
6437 | /* If no such tag is yet defined, create a forward-reference node |
6438 | and record it as the "definition". | |
6439 | When a real declaration of this type is found, | |
6440 | the forward-reference will be altered into a real type. */ | |
6441 | ||
6442 | ref = make_node (code); | |
6443 | if (code == ENUMERAL_TYPE) | |
6444 | { | |
51e29401 RS |
6445 | /* Give the type a default layout like unsigned int |
6446 | to avoid crashing if it does not get defined. */ | |
179d2f74 | 6447 | SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node)); |
51e29401 | 6448 | TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node); |
11cf4d18 | 6449 | TYPE_USER_ALIGN (ref) = 0; |
8df83eae | 6450 | TYPE_UNSIGNED (ref) = 1; |
51e29401 RS |
6451 | TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node); |
6452 | TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node); | |
6453 | TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node); | |
6454 | } | |
6455 | ||
c2255bc4 | 6456 | pushtag (loc, name, ref); |
51e29401 | 6457 | |
81da229b JM |
6458 | ret.spec = ref; |
6459 | return ret; | |
6460 | } | |
6461 | ||
6462 | /* Get the struct, enum or union (CODE says which) with tag NAME. | |
6463 | Define the tag as a forward-reference if it is not defined. | |
6464 | Return a tree for the type. */ | |
6465 | ||
6466 | tree | |
6467 | xref_tag (enum tree_code code, tree name) | |
6468 | { | |
c2255bc4 | 6469 | return parser_xref_tag (input_location, code, name).spec; |
51e29401 RS |
6470 | } |
6471 | \f | |
f8521984 | 6472 | /* Make sure that the tag NAME is defined *in the current scope* |
51e29401 | 6473 | at least as a forward reference. |
c2255bc4 | 6474 | LOC is the location of the struct's definition. |
24b97832 ILT |
6475 | CODE says which kind of tag NAME ought to be. |
6476 | ||
dc491a25 ILT |
6477 | This stores the current value of the file static STRUCT_PARSE_INFO |
6478 | in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a | |
6479 | new c_struct_parse_info structure. The old value of | |
6480 | STRUCT_PARSE_INFO is restored in finish_struct. */ | |
51e29401 RS |
6481 | |
6482 | tree | |
c2255bc4 | 6483 | start_struct (location_t loc, enum tree_code code, tree name, |
dc491a25 | 6484 | struct c_struct_parse_info **enclosing_struct_parse_info) |
51e29401 | 6485 | { |
f8521984 | 6486 | /* If there is already a tag defined at this scope |
51e29401 RS |
6487 | (as a forward reference), just return it. */ |
6488 | ||
24b97832 ILT |
6489 | tree ref = NULL_TREE; |
6490 | location_t refloc = UNKNOWN_LOCATION; | |
51e29401 | 6491 | |
24b97832 ILT |
6492 | if (name != NULL_TREE) |
6493 | ref = lookup_tag (code, name, 1, &refloc); | |
51e29401 RS |
6494 | if (ref && TREE_CODE (ref) == code) |
6495 | { | |
085e33aa | 6496 | if (TYPE_SIZE (ref)) |
c22cacf3 | 6497 | { |
53fcdc76 | 6498 | if (code == UNION_TYPE) |
24b97832 | 6499 | error_at (loc, "redefinition of %<union %E%>", name); |
c22cacf3 | 6500 | else |
24b97832 ILT |
6501 | error_at (loc, "redefinition of %<struct %E%>", name); |
6502 | if (refloc != UNKNOWN_LOCATION) | |
6503 | inform (refloc, "originally defined here"); | |
a03813c8 SE |
6504 | /* Don't create structures using a name already in use. */ |
6505 | ref = NULL_TREE; | |
35b1a6fa | 6506 | } |
085e33aa JM |
6507 | else if (C_TYPE_BEING_DEFINED (ref)) |
6508 | { | |
6509 | if (code == UNION_TYPE) | |
24b97832 | 6510 | error_at (loc, "nested redefinition of %<union %E%>", name); |
c22cacf3 | 6511 | else |
24b97832 ILT |
6512 | error_at (loc, "nested redefinition of %<struct %E%>", name); |
6513 | /* Don't bother to report "originally defined here" for a | |
6514 | nested redefinition; the original definition should be | |
6515 | obvious. */ | |
71113fcd GK |
6516 | /* Don't create structures that contain themselves. */ |
6517 | ref = NULL_TREE; | |
085e33aa | 6518 | } |
51e29401 RS |
6519 | } |
6520 | ||
71113fcd GK |
6521 | /* Otherwise create a forward-reference just so the tag is in scope. */ |
6522 | ||
6523 | if (ref == NULL_TREE || TREE_CODE (ref) != code) | |
6524 | { | |
5326cd3d | 6525 | ref = make_node (code); |
c2255bc4 | 6526 | pushtag (loc, name, ref); |
5326cd3d | 6527 | } |
35b1a6fa | 6528 | |
51e29401 | 6529 | C_TYPE_BEING_DEFINED (ref) = 1; |
02eb6e90 | 6530 | TYPE_PACKED (ref) = flag_pack_struct; |
24b97832 | 6531 | |
dc491a25 ILT |
6532 | *enclosing_struct_parse_info = struct_parse_info; |
6533 | struct_parse_info = XNEW (struct c_struct_parse_info); | |
6534 | struct_parse_info->struct_types = VEC_alloc (tree, heap, 0); | |
6535 | struct_parse_info->fields = VEC_alloc (c_binding_ptr, heap, 0); | |
6536 | struct_parse_info->typedefs_seen = VEC_alloc (tree, heap, 0); | |
24b97832 ILT |
6537 | |
6538 | /* FIXME: This will issue a warning for a use of a type defined | |
6539 | within a statement expr used within sizeof, et. al. This is not | |
6540 | terribly serious as C++ doesn't permit statement exprs within | |
6541 | sizeof anyhow. */ | |
6542 | if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof)) | |
6543 | warning_at (loc, OPT_Wc___compat, | |
6544 | "defining type in %qs expression is invalid in C++", | |
6545 | (in_sizeof | |
6546 | ? "sizeof" | |
6547 | : (in_typeof ? "typeof" : "alignof"))); | |
6548 | ||
51e29401 RS |
6549 | return ref; |
6550 | } | |
6551 | ||
f8893e47 | 6552 | /* Process the specs, declarator and width (NULL if omitted) |
51e29401 | 6553 | of a structure component, returning a FIELD_DECL node. |
2ff7cce4 | 6554 | WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node. |
b9baeecd | 6555 | DECL_ATTRS is as for grokdeclarator. |
51e29401 | 6556 | |
3d10ed6c AH |
6557 | LOC is the location of the structure component. |
6558 | ||
51e29401 RS |
6559 | This is done during the parsing of the struct declaration. |
6560 | The FIELD_DECL nodes are chained together and the lot of them | |
6561 | are ultimately passed to `build_struct' to make the RECORD_TYPE node. */ | |
6562 | ||
6563 | tree | |
3d10ed6c AH |
6564 | grokfield (location_t loc, |
6565 | struct c_declarator *declarator, struct c_declspecs *declspecs, | |
b9baeecd | 6566 | tree width, tree *decl_attrs) |
51e29401 RS |
6567 | { |
6568 | tree value; | |
6569 | ||
f8893e47 JM |
6570 | if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE |
6571 | && width == NULL_TREE) | |
3e96a2fd | 6572 | { |
750491fc RH |
6573 | /* This is an unnamed decl. |
6574 | ||
6575 | If we have something of the form "union { list } ;" then this | |
6576 | is the anonymous union extension. Similarly for struct. | |
6577 | ||
6578 | If this is something of the form "struct foo;", then | |
6579 | If MS extensions are enabled, this is handled as an | |
6580 | anonymous struct. | |
6581 | Otherwise this is a forward declaration of a structure tag. | |
6582 | ||
6583 | If this is something of the form "foo;" and foo is a TYPE_DECL, then | |
4bdd0a60 JM |
6584 | If foo names a structure or union without a tag, then this |
6585 | is an anonymous struct (this is permitted by C1X). | |
750491fc RH |
6586 | If MS extensions are enabled and foo names a structure, then |
6587 | again this is an anonymous struct. | |
6588 | Otherwise this is an error. | |
6589 | ||
95bd1dd7 | 6590 | Oh what a horrid tangled web we weave. I wonder if MS consciously |
750491fc RH |
6591 | took this from Plan 9 or if it was an accident of implementation |
6592 | that took root before someone noticed the bug... */ | |
6593 | ||
deb176fa | 6594 | tree type = declspecs->type; |
216a5f1b JM |
6595 | bool type_ok = (TREE_CODE (type) == RECORD_TYPE |
6596 | || TREE_CODE (type) == UNION_TYPE); | |
6597 | bool ok = false; | |
85d49058 | 6598 | |
4bdd0a60 | 6599 | if (type_ok) |
750491fc RH |
6600 | { |
6601 | if (flag_ms_extensions) | |
216a5f1b | 6602 | ok = true; |
4bdd0a60 | 6603 | else if (TYPE_NAME (TYPE_MAIN_VARIANT (type)) == NULL) |
216a5f1b | 6604 | ok = true; |
750491fc | 6605 | else |
216a5f1b | 6606 | ok = false; |
750491fc | 6607 | } |
216a5f1b | 6608 | if (!ok) |
3e96a2fd | 6609 | { |
3d10ed6c | 6610 | pedwarn (loc, 0, "declaration does not declare anything"); |
3e96a2fd DD |
6611 | return NULL_TREE; |
6612 | } | |
4bdd0a60 JM |
6613 | if (!flag_isoc1x) |
6614 | { | |
6615 | if (flag_isoc99) | |
6616 | pedwarn (loc, OPT_pedantic, | |
6617 | "ISO C99 doesn%'t support unnamed structs/unions"); | |
6618 | else | |
6619 | pedwarn (loc, OPT_pedantic, | |
6620 | "ISO C90 doesn%'t support unnamed structs/unions"); | |
6621 | } | |
3e96a2fd DD |
6622 | } |
6623 | ||
60919bce | 6624 | value = grokdeclarator (declarator, declspecs, FIELD, false, |
928c19bb | 6625 | width ? &width : NULL, decl_attrs, NULL, NULL, |
b9baeecd | 6626 | DEPRECATED_NORMAL); |
51e29401 | 6627 | |
c2255bc4 | 6628 | finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE); |
dfd48d76 | 6629 | DECL_INITIAL (value) = width; |
51e29401 | 6630 | |
dc491a25 ILT |
6631 | if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE) |
6632 | { | |
6633 | /* If we currently have a binding for this field, set the | |
6634 | in_struct field in the binding, so that we warn about lookups | |
6635 | which find it. */ | |
6636 | struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value)); | |
6637 | if (b != NULL) | |
6638 | { | |
6639 | /* If the in_struct field is not yet set, push it on a list | |
6640 | to be cleared when this struct is finished. */ | |
6641 | if (!b->in_struct) | |
6642 | { | |
6643 | VEC_safe_push (c_binding_ptr, heap, | |
6644 | struct_parse_info->fields, b); | |
6645 | b->in_struct = 1; | |
6646 | } | |
6647 | } | |
6648 | } | |
6649 | ||
51e29401 RS |
6650 | return value; |
6651 | } | |
6652 | \f | |
492fc0ee JM |
6653 | /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST |
6654 | to HTAB, giving errors for any duplicates. */ | |
6655 | ||
6656 | static void | |
6657 | detect_field_duplicates_hash (tree fieldlist, htab_t htab) | |
6658 | { | |
6659 | tree x, y; | |
6660 | void **slot; | |
6661 | ||
6662 | for (x = fieldlist; x ; x = TREE_CHAIN (x)) | |
6663 | if ((y = DECL_NAME (x)) != 0) | |
6664 | { | |
6665 | slot = htab_find_slot (htab, y, INSERT); | |
6666 | if (*slot) | |
6667 | { | |
6668 | error ("duplicate member %q+D", x); | |
6669 | DECL_NAME (x) = NULL_TREE; | |
6670 | } | |
6671 | *slot = y; | |
6672 | } | |
6673 | else if (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE | |
6674 | || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE) | |
6675 | detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x)), htab); | |
6676 | } | |
6677 | ||
66ea6f4c RH |
6678 | /* Generate an error for any duplicate field names in FIELDLIST. Munge |
6679 | the list such that this does not present a problem later. */ | |
6680 | ||
6681 | static void | |
6682 | detect_field_duplicates (tree fieldlist) | |
6683 | { | |
6684 | tree x, y; | |
6685 | int timeout = 10; | |
6686 | ||
6687 | /* First, see if there are more than "a few" fields. | |
6688 | This is trivially true if there are zero or one fields. */ | |
6689 | if (!fieldlist) | |
6690 | return; | |
6691 | x = TREE_CHAIN (fieldlist); | |
6692 | if (!x) | |
6693 | return; | |
6694 | do { | |
6695 | timeout--; | |
492fc0ee JM |
6696 | if (DECL_NAME (x) == NULL_TREE |
6697 | && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE | |
6698 | || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)) | |
6699 | timeout = 0; | |
66ea6f4c RH |
6700 | x = TREE_CHAIN (x); |
6701 | } while (timeout > 0 && x); | |
6702 | ||
492fc0ee JM |
6703 | /* If there were "few" fields and no anonymous structures or unions, |
6704 | avoid the overhead of allocating a hash table. Instead just do | |
6705 | the nested traversal thing. */ | |
66ea6f4c RH |
6706 | if (timeout > 0) |
6707 | { | |
6708 | for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x)) | |
6709 | if (DECL_NAME (x)) | |
6710 | { | |
6711 | for (y = fieldlist; y != x; y = TREE_CHAIN (y)) | |
6712 | if (DECL_NAME (y) == DECL_NAME (x)) | |
6713 | { | |
dee15844 | 6714 | error ("duplicate member %q+D", x); |
66ea6f4c RH |
6715 | DECL_NAME (x) = NULL_TREE; |
6716 | } | |
6717 | } | |
6718 | } | |
6719 | else | |
6720 | { | |
6721 | htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL); | |
66ea6f4c | 6722 | |
492fc0ee | 6723 | detect_field_duplicates_hash (fieldlist, htab); |
66ea6f4c RH |
6724 | htab_delete (htab); |
6725 | } | |
6726 | } | |
6727 | ||
dc491a25 ILT |
6728 | /* Finish up struct info used by -Wc++-compat. */ |
6729 | ||
6730 | static void | |
6731 | warn_cxx_compat_finish_struct (tree fieldlist) | |
6732 | { | |
6733 | unsigned int ix; | |
6734 | tree x; | |
6735 | struct c_binding *b; | |
6736 | ||
6737 | /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in | |
6738 | the current struct. We do this now at the end of the struct | |
6739 | because the flag is used to issue visibility warnings, and we | |
6740 | only want to issue those warnings if the type is referenced | |
6741 | outside of the struct declaration. */ | |
6742 | for (ix = 0; VEC_iterate (tree, struct_parse_info->struct_types, ix, x); ++ix) | |
6743 | C_TYPE_DEFINED_IN_STRUCT (x) = 1; | |
6744 | ||
6745 | /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of | |
6746 | typedefs used when declaring fields in this struct. If the name | |
6747 | of any of the fields is also a typedef name then the struct would | |
6748 | not parse in C++, because the C++ lookup rules say that the | |
6749 | typedef name would be looked up in the context of the struct, and | |
6750 | would thus be the field rather than the typedef. */ | |
6751 | if (!VEC_empty (tree, struct_parse_info->typedefs_seen) | |
6752 | && fieldlist != NULL_TREE) | |
6753 | { | |
6754 | /* Use a pointer_set using the name of the typedef. We can use | |
6755 | a pointer_set because identifiers are interned. */ | |
6756 | struct pointer_set_t *tset = pointer_set_create (); | |
6757 | ||
6758 | for (ix = 0; | |
6759 | VEC_iterate (tree, struct_parse_info->typedefs_seen, ix, x); | |
6760 | ++ix) | |
6761 | pointer_set_insert (tset, DECL_NAME (x)); | |
6762 | ||
6763 | for (x = fieldlist; x != NULL_TREE; x = TREE_CHAIN (x)) | |
6764 | { | |
6765 | if (pointer_set_contains (tset, DECL_NAME (x))) | |
6766 | { | |
6767 | warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat, | |
6768 | ("using %qD as both field and typedef name is " | |
6769 | "invalid in C++"), | |
6770 | x); | |
6771 | /* FIXME: It would be nice to report the location where | |
6772 | the typedef name is used. */ | |
6773 | } | |
6774 | } | |
6775 | ||
6776 | pointer_set_destroy (tset); | |
6777 | } | |
6778 | ||
6779 | /* For each field which has a binding and which was not defined in | |
6780 | an enclosing struct, clear the in_struct field. */ | |
6781 | for (ix = 0; | |
6782 | VEC_iterate (c_binding_ptr, struct_parse_info->fields, ix, b); | |
6783 | ++ix) | |
6784 | b->in_struct = 0; | |
6785 | } | |
6786 | ||
51e29401 | 6787 | /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T. |
c2255bc4 | 6788 | LOC is the location of the RECORD_TYPE or UNION_TYPE's definition. |
7a0347ff | 6789 | FIELDLIST is a chain of FIELD_DECL nodes for the fields. |
24b97832 ILT |
6790 | ATTRIBUTES are attributes to be applied to the structure. |
6791 | ||
dc491a25 ILT |
6792 | ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when |
6793 | the struct was started. */ | |
51e29401 RS |
6794 | |
6795 | tree | |
c2255bc4 | 6796 | finish_struct (location_t loc, tree t, tree fieldlist, tree attributes, |
dc491a25 | 6797 | struct c_struct_parse_info *enclosing_struct_parse_info) |
51e29401 | 6798 | { |
b3694847 | 6799 | tree x; |
f75fbaf7 | 6800 | bool toplevel = file_scope == current_scope; |
ffc5c6a9 | 6801 | int saw_named_field; |
51e29401 RS |
6802 | |
6803 | /* If this type was previously laid out as a forward reference, | |
6804 | make sure we lay it out again. */ | |
6805 | ||
6806 | TYPE_SIZE (t) = 0; | |
6807 | ||
91d231cb | 6808 | decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); |
10861e9a | 6809 | |
9590fa72 RK |
6810 | if (pedantic) |
6811 | { | |
6812 | for (x = fieldlist; x; x = TREE_CHAIN (x)) | |
4bdd0a60 JM |
6813 | { |
6814 | if (DECL_NAME (x) != 0) | |
6815 | break; | |
6816 | if (flag_isoc1x | |
6817 | && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE | |
6818 | || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)) | |
6819 | break; | |
6820 | } | |
9590fa72 RK |
6821 | |
6822 | if (x == 0) | |
cc0b9d52 JM |
6823 | { |
6824 | if (TREE_CODE (t) == UNION_TYPE) | |
6825 | { | |
6826 | if (fieldlist) | |
c2255bc4 | 6827 | pedwarn (loc, OPT_pedantic, "union has no named members"); |
cc0b9d52 | 6828 | else |
c2255bc4 | 6829 | pedwarn (loc, OPT_pedantic, "union has no members"); |
cc0b9d52 JM |
6830 | } |
6831 | else | |
6832 | { | |
6833 | if (fieldlist) | |
c2255bc4 | 6834 | pedwarn (loc, OPT_pedantic, "struct has no named members"); |
cc0b9d52 | 6835 | else |
c2255bc4 | 6836 | pedwarn (loc, OPT_pedantic, "struct has no members"); |
cc0b9d52 JM |
6837 | } |
6838 | } | |
9590fa72 | 6839 | } |
51e29401 | 6840 | |
dfd48d76 | 6841 | /* Install struct as DECL_CONTEXT of each field decl. |
bc15d0ef JM |
6842 | Also process specified field sizes, found in the DECL_INITIAL, |
6843 | storing 0 there after the type has been changed to precision equal | |
6844 | to its width, rather than the precision of the specified standard | |
6845 | type. (Correct layout requires the original type to have been preserved | |
6846 | until now.) */ | |
51e29401 | 6847 | |
ffc5c6a9 | 6848 | saw_named_field = 0; |
51e29401 RS |
6849 | for (x = fieldlist; x; x = TREE_CHAIN (x)) |
6850 | { | |
4271a6f3 VR |
6851 | if (TREE_TYPE (x) == error_mark_node) |
6852 | continue; | |
6853 | ||
51e29401 | 6854 | DECL_CONTEXT (x) = t; |
646c0835 | 6855 | |
51e29401 RS |
6856 | /* If any field is const, the structure type is pseudo-const. */ |
6857 | if (TREE_READONLY (x)) | |
6858 | C_TYPE_FIELDS_READONLY (t) = 1; | |
6859 | else | |
6860 | { | |
6861 | /* A field that is pseudo-const makes the structure likewise. */ | |
6862 | tree t1 = TREE_TYPE (x); | |
6863 | while (TREE_CODE (t1) == ARRAY_TYPE) | |
6864 | t1 = TREE_TYPE (t1); | |
6865 | if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE) | |
6866 | && C_TYPE_FIELDS_READONLY (t1)) | |
6867 | C_TYPE_FIELDS_READONLY (t) = 1; | |
6868 | } | |
6869 | ||
6870 | /* Any field that is volatile means variables of this type must be | |
6871 | treated in some ways as volatile. */ | |
6872 | if (TREE_THIS_VOLATILE (x)) | |
6873 | C_TYPE_FIELDS_VOLATILE (t) = 1; | |
6874 | ||
6875 | /* Any field of nominal variable size implies structure is too. */ | |
6876 | if (C_DECL_VARIABLE_SIZE (x)) | |
6877 | C_TYPE_VARIABLE_SIZE (t) = 1; | |
6878 | ||
dfd48d76 NB |
6879 | if (DECL_INITIAL (x)) |
6880 | { | |
2ff7cce4 JM |
6881 | unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1); |
6882 | DECL_SIZE (x) = bitsize_int (width); | |
6883 | DECL_BIT_FIELD (x) = 1; | |
6884 | SET_DECL_C_BIT_FIELD (x); | |
dfd48d76 NB |
6885 | } |
6886 | ||
2cd36c22 AN |
6887 | if (TYPE_PACKED (t) |
6888 | && (DECL_BIT_FIELD (x) | |
6889 | || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT)) | |
6890 | DECL_PACKED (x) = 1; | |
6891 | ||
ffc5c6a9 RH |
6892 | /* Detect flexible array member in an invalid context. */ |
6893 | if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE | |
6894 | && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE | |
6895 | && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE | |
6896 | && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE) | |
6897 | { | |
6898 | if (TREE_CODE (t) == UNION_TYPE) | |
d915eec0 | 6899 | { |
c2255bc4 | 6900 | error_at (DECL_SOURCE_LOCATION (x), |
c5d75364 | 6901 | "flexible array member in union"); |
d915eec0 JJ |
6902 | TREE_TYPE (x) = error_mark_node; |
6903 | } | |
ffc5c6a9 | 6904 | else if (TREE_CHAIN (x) != NULL_TREE) |
d915eec0 | 6905 | { |
c2255bc4 | 6906 | error_at (DECL_SOURCE_LOCATION (x), |
c5d75364 | 6907 | "flexible array member not at end of struct"); |
d915eec0 JJ |
6908 | TREE_TYPE (x) = error_mark_node; |
6909 | } | |
3f75a254 | 6910 | else if (!saw_named_field) |
d915eec0 | 6911 | { |
c2255bc4 | 6912 | error_at (DECL_SOURCE_LOCATION (x), |
c5d75364 | 6913 | "flexible array member in otherwise empty struct"); |
d915eec0 JJ |
6914 | TREE_TYPE (x) = error_mark_node; |
6915 | } | |
ffc5c6a9 | 6916 | } |
2984fe64 | 6917 | |
c5d75364 | 6918 | if (pedantic && TREE_CODE (t) == RECORD_TYPE |
2984fe64 | 6919 | && flexible_array_type_p (TREE_TYPE (x))) |
b8698a0f | 6920 | pedwarn (DECL_SOURCE_LOCATION (x), OPT_pedantic, |
c5d75364 | 6921 | "invalid use of structure with flexible array member"); |
2984fe64 | 6922 | |
4bdd0a60 JM |
6923 | if (DECL_NAME (x) |
6924 | || TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE | |
6925 | || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE) | |
ffc5c6a9 | 6926 | saw_named_field = 1; |
05bccae2 | 6927 | } |
51e29401 | 6928 | |
66ea6f4c | 6929 | detect_field_duplicates (fieldlist); |
51e29401 RS |
6930 | |
6931 | /* Now we have the nearly final fieldlist. Record it, | |
6932 | then lay out the structure or union (including the fields). */ | |
6933 | ||
6934 | TYPE_FIELDS (t) = fieldlist; | |
6935 | ||
6936 | layout_type (t); | |
6937 | ||
bc15d0ef | 6938 | /* Give bit-fields their proper types. */ |
6fbfac92 JM |
6939 | { |
6940 | tree *fieldlistp = &fieldlist; | |
07b983cd | 6941 | while (*fieldlistp) |
bc15d0ef JM |
6942 | if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp) |
6943 | && TREE_TYPE (*fieldlistp) != error_mark_node) | |
6944 | { | |
6945 | unsigned HOST_WIDE_INT width | |
6946 | = tree_low_cst (DECL_INITIAL (*fieldlistp), 1); | |
6947 | tree type = TREE_TYPE (*fieldlistp); | |
6948 | if (width != TYPE_PRECISION (type)) | |
48cc8d3b RH |
6949 | { |
6950 | TREE_TYPE (*fieldlistp) | |
0b359b01 | 6951 | = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type)); |
48cc8d3b RH |
6952 | DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp)); |
6953 | } | |
bc15d0ef JM |
6954 | DECL_INITIAL (*fieldlistp) = 0; |
6955 | } | |
6fbfac92 JM |
6956 | else |
6957 | fieldlistp = &TREE_CHAIN (*fieldlistp); | |
6958 | } | |
51e29401 | 6959 | |
ffc5c6a9 RH |
6960 | /* Now we have the truly final field list. |
6961 | Store it in this type and in the variants. */ | |
51e29401 RS |
6962 | |
6963 | TYPE_FIELDS (t) = fieldlist; | |
6964 | ||
d07605f5 | 6965 | /* If there are lots of fields, sort so we can look through them fast. |
6614fd40 | 6966 | We arbitrarily consider 16 or more elts to be "a lot". */ |
d07605f5 AP |
6967 | |
6968 | { | |
6969 | int len = 0; | |
6970 | ||
6971 | for (x = fieldlist; x; x = TREE_CHAIN (x)) | |
6972 | { | |
c22cacf3 MS |
6973 | if (len > 15 || DECL_NAME (x) == NULL) |
6974 | break; | |
6975 | len += 1; | |
d07605f5 AP |
6976 | } |
6977 | ||
6978 | if (len > 15) | |
6979 | { | |
c22cacf3 MS |
6980 | tree *field_array; |
6981 | struct lang_type *space; | |
6982 | struct sorted_fields_type *space2; | |
e13e48e7 | 6983 | |
c22cacf3 | 6984 | len += list_length (x); |
e13e48e7 | 6985 | |
c22cacf3 MS |
6986 | /* Use the same allocation policy here that make_node uses, to |
6987 | ensure that this lives as long as the rest of the struct decl. | |
6988 | All decls in an inline function need to be saved. */ | |
e13e48e7 | 6989 | |
a9429e29 LB |
6990 | space = ggc_alloc_cleared_lang_type (sizeof (struct lang_type)); |
6991 | space2 = ggc_alloc_sorted_fields_type | |
6992 | (sizeof (struct sorted_fields_type) + len * sizeof (tree)); | |
e13e48e7 | 6993 | |
c22cacf3 | 6994 | len = 0; |
d07605f5 AP |
6995 | space->s = space2; |
6996 | field_array = &space2->elts[0]; | |
c22cacf3 MS |
6997 | for (x = fieldlist; x; x = TREE_CHAIN (x)) |
6998 | { | |
6999 | field_array[len++] = x; | |
7000 | ||
7001 | /* If there is anonymous struct or union, break out of the loop. */ | |
7002 | if (DECL_NAME (x) == NULL) | |
7003 | break; | |
7004 | } | |
7005 | /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */ | |
7006 | if (x == NULL) | |
7007 | { | |
7008 | TYPE_LANG_SPECIFIC (t) = space; | |
7009 | TYPE_LANG_SPECIFIC (t)->s->len = len; | |
7010 | field_array = TYPE_LANG_SPECIFIC (t)->s->elts; | |
7011 | qsort (field_array, len, sizeof (tree), field_decl_cmp); | |
7012 | } | |
d07605f5 AP |
7013 | } |
7014 | } | |
e13e48e7 | 7015 | |
51e29401 RS |
7016 | for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x)) |
7017 | { | |
7018 | TYPE_FIELDS (x) = TYPE_FIELDS (t); | |
7019 | TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t); | |
692a7aa3 JM |
7020 | C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t); |
7021 | C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t); | |
7022 | C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t); | |
51e29401 RS |
7023 | } |
7024 | ||
1604422c RK |
7025 | /* If this was supposed to be a transparent union, but we can't |
7026 | make it one, warn and turn off the flag. */ | |
7027 | if (TREE_CODE (t) == UNION_TYPE | |
ebf0bf7f | 7028 | && TYPE_TRANSPARENT_AGGR (t) |
eb3490b9 | 7029 | && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))) |
1604422c | 7030 | { |
ebf0bf7f | 7031 | TYPE_TRANSPARENT_AGGR (t) = 0; |
c2255bc4 | 7032 | warning_at (loc, 0, "union cannot be made transparent"); |
1604422c RK |
7033 | } |
7034 | ||
51e29401 RS |
7035 | /* If this structure or union completes the type of any previous |
7036 | variable declaration, lay it out and output its rtl. */ | |
bf7a697f ZW |
7037 | for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)); |
7038 | x; | |
7039 | x = TREE_CHAIN (x)) | |
51e29401 | 7040 | { |
bf7a697f ZW |
7041 | tree decl = TREE_VALUE (x); |
7042 | if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE) | |
7043 | layout_array_type (TREE_TYPE (decl)); | |
7044 | if (TREE_CODE (decl) != TYPE_DECL) | |
7045 | { | |
7046 | layout_decl (decl, 0); | |
7047 | if (c_dialect_objc ()) | |
7048 | objc_check_decl (decl); | |
0e6df31e | 7049 | rest_of_decl_compilation (decl, toplevel, 0); |
3f75a254 | 7050 | if (!toplevel) |
bf7a697f | 7051 | expand_decl (decl); |
51e29401 RS |
7052 | } |
7053 | } | |
bf7a697f | 7054 | C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0; |
51e29401 | 7055 | |
591a8495 JJ |
7056 | /* Update type location to the one of the definition, instead of e.g. |
7057 | a forward declaration. */ | |
7058 | if (TYPE_STUB_DECL (t)) | |
7059 | DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc; | |
7060 | ||
51e29401 RS |
7061 | /* Finish debugging output for this type. */ |
7062 | rest_of_type_compilation (t, toplevel); | |
7063 | ||
ca6af4f8 RH |
7064 | /* If we're inside a function proper, i.e. not file-scope and not still |
7065 | parsing parameters, then arrange for the size of a variable sized type | |
7066 | to be bound now. */ | |
52ffd86e | 7067 | if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE)) |
c2255bc4 AH |
7068 | add_stmt (build_stmt (loc, |
7069 | DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t))); | |
ca6af4f8 | 7070 | |
dc491a25 ILT |
7071 | if (warn_cxx_compat) |
7072 | warn_cxx_compat_finish_struct (fieldlist); | |
24b97832 | 7073 | |
dc491a25 ILT |
7074 | VEC_free (tree, heap, struct_parse_info->struct_types); |
7075 | VEC_free (c_binding_ptr, heap, struct_parse_info->fields); | |
7076 | VEC_free (tree, heap, struct_parse_info->typedefs_seen); | |
7077 | XDELETE (struct_parse_info); | |
24b97832 | 7078 | |
dc491a25 | 7079 | struct_parse_info = enclosing_struct_parse_info; |
24b97832 ILT |
7080 | |
7081 | /* If this struct is defined inside a struct, add it to | |
dc491a25 ILT |
7082 | struct_types. */ |
7083 | if (warn_cxx_compat | |
7084 | && struct_parse_info != NULL | |
7085 | && !in_sizeof && !in_typeof && !in_alignof) | |
7086 | VEC_safe_push (tree, heap, struct_parse_info->struct_types, t); | |
24b97832 | 7087 | |
51e29401 RS |
7088 | return t; |
7089 | } | |
7090 | ||
7091 | /* Lay out the type T, and its element type, and so on. */ | |
7092 | ||
7093 | static void | |
35b1a6fa | 7094 | layout_array_type (tree t) |
51e29401 RS |
7095 | { |
7096 | if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE) | |
7097 | layout_array_type (TREE_TYPE (t)); | |
7098 | layout_type (t); | |
7099 | } | |
7100 | \f | |
7101 | /* Begin compiling the definition of an enumeration type. | |
7102 | NAME is its name (or null if anonymous). | |
c2255bc4 | 7103 | LOC is the enum's location. |
51e29401 RS |
7104 | Returns the type object, as yet incomplete. |
7105 | Also records info about it so that build_enumerator | |
7106 | may be used to declare the individual values as they are read. */ | |
7107 | ||
7108 | tree | |
c2255bc4 | 7109 | start_enum (location_t loc, struct c_enum_contents *the_enum, tree name) |
51e29401 | 7110 | { |
24b97832 ILT |
7111 | tree enumtype = NULL_TREE; |
7112 | location_t enumloc = UNKNOWN_LOCATION; | |
51e29401 RS |
7113 | |
7114 | /* If this is the real definition for a previous forward reference, | |
7115 | fill in the contents in the same object that used to be the | |
7116 | forward reference. */ | |
7117 | ||
24b97832 ILT |
7118 | if (name != NULL_TREE) |
7119 | enumtype = lookup_tag (ENUMERAL_TYPE, name, 1, &enumloc); | |
51e29401 RS |
7120 | |
7121 | if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE) | |
7122 | { | |
7123 | enumtype = make_node (ENUMERAL_TYPE); | |
c2255bc4 | 7124 | pushtag (loc, name, enumtype); |
51e29401 RS |
7125 | } |
7126 | ||
085e33aa | 7127 | if (C_TYPE_BEING_DEFINED (enumtype)) |
24b97832 | 7128 | error_at (loc, "nested redefinition of %<enum %E%>", name); |
085e33aa | 7129 | |
51e29401 RS |
7130 | C_TYPE_BEING_DEFINED (enumtype) = 1; |
7131 | ||
7132 | if (TYPE_VALUES (enumtype) != 0) | |
7133 | { | |
7134 | /* This enum is a named one that has been declared already. */ | |
24b97832 ILT |
7135 | error_at (loc, "redeclaration of %<enum %E%>", name); |
7136 | if (enumloc != UNKNOWN_LOCATION) | |
7137 | inform (enumloc, "originally defined here"); | |
51e29401 RS |
7138 | |
7139 | /* Completely replace its old definition. | |
7140 | The old enumerators remain defined, however. */ | |
7141 | TYPE_VALUES (enumtype) = 0; | |
7142 | } | |
7143 | ||
7114359f TT |
7144 | the_enum->enum_next_value = integer_zero_node; |
7145 | the_enum->enum_overflow = 0; | |
51e29401 | 7146 | |
02eb6e90 RK |
7147 | if (flag_short_enums) |
7148 | TYPE_PACKED (enumtype) = 1; | |
7149 | ||
24b97832 ILT |
7150 | /* FIXME: This will issue a warning for a use of a type defined |
7151 | within sizeof in a statement expr. This is not terribly serious | |
7152 | as C++ doesn't permit statement exprs within sizeof anyhow. */ | |
7153 | if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof)) | |
7154 | warning_at (loc, OPT_Wc___compat, | |
7155 | "defining type in %qs expression is invalid in C++", | |
7156 | (in_sizeof | |
7157 | ? "sizeof" | |
7158 | : (in_typeof ? "typeof" : "alignof"))); | |
7159 | ||
51e29401 RS |
7160 | return enumtype; |
7161 | } | |
7162 | ||
7163 | /* After processing and defining all the values of an enumeration type, | |
7164 | install their decls in the enumeration type and finish it off. | |
10861e9a RK |
7165 | ENUMTYPE is the type object, VALUES a list of decl-value pairs, |
7166 | and ATTRIBUTES are the specified attributes. | |
51e29401 RS |
7167 | Returns ENUMTYPE. */ |
7168 | ||
7169 | tree | |
35b1a6fa | 7170 | finish_enum (tree enumtype, tree values, tree attributes) |
51e29401 | 7171 | { |
b3694847 | 7172 | tree pair, tem; |
6de9cd9a | 7173 | tree minnode = 0, maxnode = 0; |
cb3ca04e | 7174 | int precision, unsign; |
f75fbaf7 | 7175 | bool toplevel = (file_scope == current_scope); |
6de9cd9a | 7176 | struct lang_type *lt; |
51e29401 | 7177 | |
91d231cb | 7178 | decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); |
10861e9a | 7179 | |
51e29401 RS |
7180 | /* Calculate the maximum value of any enumerator in this type. */ |
7181 | ||
59116212 RK |
7182 | if (values == error_mark_node) |
7183 | minnode = maxnode = integer_zero_node; | |
7184 | else | |
f500253d | 7185 | { |
cb3ca04e ZW |
7186 | minnode = maxnode = TREE_VALUE (values); |
7187 | for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair)) | |
f500253d | 7188 | { |
cb3ca04e ZW |
7189 | tree value = TREE_VALUE (pair); |
7190 | if (tree_int_cst_lt (maxnode, value)) | |
7191 | maxnode = value; | |
7192 | if (tree_int_cst_lt (value, minnode)) | |
7193 | minnode = value; | |
f500253d | 7194 | } |
cb3ca04e | 7195 | } |
f500253d | 7196 | |
cb3ca04e ZW |
7197 | /* Construct the final type of this enumeration. It is the same |
7198 | as one of the integral types - the narrowest one that fits, except | |
7199 | that normally we only go as narrow as int - and signed iff any of | |
7200 | the values are negative. */ | |
7201 | unsign = (tree_int_cst_sgn (minnode) >= 0); | |
cdd6a337 MLI |
7202 | precision = MAX (tree_int_cst_min_precision (minnode, unsign), |
7203 | tree_int_cst_min_precision (maxnode, unsign)); | |
ec8465a5 | 7204 | |
1ada4cd0 | 7205 | if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node)) |
cb3ca04e | 7206 | { |
6de9cd9a DN |
7207 | tem = c_common_type_for_size (precision, unsign); |
7208 | if (tem == NULL) | |
1ada4cd0 | 7209 | { |
d4ee4d25 | 7210 | warning (0, "enumeration values exceed range of largest integer"); |
6de9cd9a | 7211 | tem = long_long_integer_type_node; |
1ada4cd0 | 7212 | } |
f500253d | 7213 | } |
1ada4cd0 | 7214 | else |
6de9cd9a | 7215 | tem = unsign ? unsigned_type_node : integer_type_node; |
736f85c7 | 7216 | |
6de9cd9a DN |
7217 | TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem); |
7218 | TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem); | |
6de9cd9a | 7219 | TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem); |
51e29401 | 7220 | TYPE_SIZE (enumtype) = 0; |
ec8465a5 RK |
7221 | |
7222 | /* If the precision of the type was specific with an attribute and it | |
7223 | was too small, give an error. Otherwise, use it. */ | |
7224 | if (TYPE_PRECISION (enumtype)) | |
7225 | { | |
7226 | if (precision > TYPE_PRECISION (enumtype)) | |
7227 | error ("specified mode too small for enumeral values"); | |
7228 | } | |
7229 | else | |
7230 | TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem); | |
7231 | ||
51e29401 RS |
7232 | layout_type (enumtype); |
7233 | ||
59116212 | 7234 | if (values != error_mark_node) |
75b46437 | 7235 | { |
cb3ca04e ZW |
7236 | /* Change the type of the enumerators to be the enum type. We |
7237 | need to do this irrespective of the size of the enum, for | |
7238 | proper type checking. Replace the DECL_INITIALs of the | |
7239 | enumerators, and the value slots of the list, with copies | |
7240 | that have the enum type; they cannot be modified in place | |
7241 | because they may be shared (e.g. integer_zero_node) Finally, | |
7242 | change the purpose slots to point to the names of the decls. */ | |
59116212 RK |
7243 | for (pair = values; pair; pair = TREE_CHAIN (pair)) |
7244 | { | |
cb3ca04e | 7245 | tree enu = TREE_PURPOSE (pair); |
6de9cd9a | 7246 | tree ini = DECL_INITIAL (enu); |
51e29401 | 7247 | |
cb3ca04e | 7248 | TREE_TYPE (enu) = enumtype; |
736f85c7 AO |
7249 | |
7250 | /* The ISO C Standard mandates enumerators to have type int, | |
7251 | even though the underlying type of an enum type is | |
85790e66 | 7252 | unspecified. However, GCC allows enumerators of any |
a7e72022 MLI |
7253 | integer type as an extensions. build_enumerator() |
7254 | converts any enumerators that fit in an int to type int, | |
7255 | to avoid promotions to unsigned types when comparing | |
7256 | integers with enumerators that fit in the int range. | |
7257 | When -pedantic is given, build_enumerator() would have | |
7258 | already warned about those that don't fit. Here we | |
7259 | convert the rest to the enumerator type. */ | |
7260 | if (TREE_TYPE (ini) != integer_type_node) | |
7261 | ini = convert (enumtype, ini); | |
cb3ca04e | 7262 | |
6de9cd9a | 7263 | DECL_INITIAL (enu) = ini; |
cb3ca04e | 7264 | TREE_PURPOSE (pair) = DECL_NAME (enu); |
6de9cd9a | 7265 | TREE_VALUE (pair) = ini; |
cb3ca04e | 7266 | } |
51e29401 | 7267 | |
59116212 RK |
7268 | TYPE_VALUES (enumtype) = values; |
7269 | } | |
51e29401 | 7270 | |
6de9cd9a DN |
7271 | /* Record the min/max values so that we can warn about bit-field |
7272 | enumerations that are too small for the values. */ | |
a9429e29 | 7273 | lt = ggc_alloc_cleared_lang_type (sizeof (struct lang_type)); |
6de9cd9a DN |
7274 | lt->enum_min = minnode; |
7275 | lt->enum_max = maxnode; | |
7276 | TYPE_LANG_SPECIFIC (enumtype) = lt; | |
7277 | ||
fbe23ee7 RS |
7278 | /* Fix up all variant types of this enum type. */ |
7279 | for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem)) | |
7280 | { | |
cb3ca04e ZW |
7281 | if (tem == enumtype) |
7282 | continue; | |
fbe23ee7 RS |
7283 | TYPE_VALUES (tem) = TYPE_VALUES (enumtype); |
7284 | TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype); | |
7285 | TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype); | |
7286 | TYPE_SIZE (tem) = TYPE_SIZE (enumtype); | |
def9b006 | 7287 | TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype); |
179d2f74 | 7288 | SET_TYPE_MODE (tem, TYPE_MODE (enumtype)); |
fbe23ee7 RS |
7289 | TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype); |
7290 | TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype); | |
11cf4d18 | 7291 | TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype); |
8df83eae | 7292 | TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype); |
6de9cd9a | 7293 | TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype); |
fbe23ee7 RS |
7294 | } |
7295 | ||
51e29401 RS |
7296 | /* Finish debugging output for this type. */ |
7297 | rest_of_type_compilation (enumtype, toplevel); | |
7298 | ||
24b97832 | 7299 | /* If this enum is defined inside a struct, add it to |
dc491a25 ILT |
7300 | struct_types. */ |
7301 | if (warn_cxx_compat | |
7302 | && struct_parse_info != NULL | |
7303 | && !in_sizeof && !in_typeof && !in_alignof) | |
7304 | VEC_safe_push (tree, heap, struct_parse_info->struct_types, enumtype); | |
24b97832 | 7305 | |
51e29401 RS |
7306 | return enumtype; |
7307 | } | |
7308 | ||
7309 | /* Build and install a CONST_DECL for one value of the | |
7310 | current enumeration type (one that was begun with start_enum). | |
c2255bc4 | 7311 | LOC is the location of the enumerator. |
51e29401 RS |
7312 | Return a tree-list containing the CONST_DECL and its value. |
7313 | Assignment of sequential values by default is handled here. */ | |
7314 | ||
7315 | tree | |
c2255bc4 AH |
7316 | build_enumerator (location_t loc, |
7317 | struct c_enum_contents *the_enum, tree name, tree value) | |
51e29401 | 7318 | { |
b3694847 | 7319 | tree decl, type; |
51e29401 RS |
7320 | |
7321 | /* Validate and default VALUE. */ | |
7322 | ||
90374cc2 | 7323 | if (value != 0) |
e681c5a1 | 7324 | { |
f75fbaf7 ZW |
7325 | /* Don't issue more errors for error_mark_node (i.e. an |
7326 | undeclared identifier) - just ignore the value expression. */ | |
7327 | if (value == error_mark_node) | |
7328 | value = 0; | |
6895bac8 | 7329 | else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))) |
25a1019f | 7330 | { |
c2255bc4 AH |
7331 | error_at (loc, "enumerator value for %qE is not an integer constant", |
7332 | name); | |
f75fbaf7 | 7333 | value = 0; |
25a1019f | 7334 | } |
e681c5a1 RS |
7335 | else |
7336 | { | |
6895bac8 JM |
7337 | if (TREE_CODE (value) != INTEGER_CST) |
7338 | { | |
7339 | value = c_fully_fold (value, false, NULL); | |
7340 | if (TREE_CODE (value) == INTEGER_CST) | |
c2255bc4 | 7341 | pedwarn (loc, OPT_pedantic, |
6895bac8 JM |
7342 | "enumerator value for %qE is not an integer " |
7343 | "constant expression", name); | |
7344 | } | |
7345 | if (TREE_CODE (value) != INTEGER_CST) | |
7346 | { | |
7347 | error ("enumerator value for %qE is not an integer constant", | |
7348 | name); | |
7349 | value = 0; | |
7350 | } | |
7351 | else | |
7352 | { | |
7353 | value = default_conversion (value); | |
7354 | constant_expression_warning (value); | |
7355 | } | |
e681c5a1 RS |
7356 | } |
7357 | } | |
51e29401 RS |
7358 | |
7359 | /* Default based on previous value. */ | |
7360 | /* It should no longer be possible to have NON_LVALUE_EXPR | |
7361 | in the default. */ | |
7362 | if (value == 0) | |
93e3ba4f | 7363 | { |
7114359f TT |
7364 | value = the_enum->enum_next_value; |
7365 | if (the_enum->enum_overflow) | |
c2255bc4 | 7366 | error_at (loc, "overflow in enumeration values"); |
93e3ba4f | 7367 | } |
85790e66 MLI |
7368 | /* Even though the underlying type of an enum is unspecified, the |
7369 | type of enumeration constants is explicitly defined as int | |
7370 | (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as | |
7371 | an extension. */ | |
7372 | else if (!int_fits_type_p (value, integer_type_node)) | |
b8698a0f | 7373 | pedwarn (loc, OPT_pedantic, |
509c9d60 | 7374 | "ISO C restricts enumerator values to range of %<int%>"); |
51e29401 | 7375 | |
a7e72022 MLI |
7376 | /* The ISO C Standard mandates enumerators to have type int, even |
7377 | though the underlying type of an enum type is unspecified. | |
7378 | However, GCC allows enumerators of any integer type as an | |
7379 | extensions. Here we convert any enumerators that fit in an int | |
7380 | to type int, to avoid promotions to unsigned types when comparing | |
7381 | integers with enumerators that fit in the int range. When | |
7382 | -pedantic is given, we would have already warned about those that | |
7383 | don't fit. We have to do this here rather than in finish_enum | |
7384 | because this value may be used to define more enumerators. */ | |
7385 | if (int_fits_type_p (value, integer_type_node)) | |
7386 | value = convert (integer_type_node, value); | |
7387 | ||
51e29401 | 7388 | /* Set basis for default for next value. */ |
ba47d38d AH |
7389 | the_enum->enum_next_value |
7390 | = build_binary_op | |
7391 | (EXPR_HAS_LOCATION (value) ? EXPR_LOCATION (value) : input_location, | |
7392 | PLUS_EXPR, value, integer_one_node, 0); | |
7114359f | 7393 | the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value); |
51e29401 RS |
7394 | |
7395 | /* Now create a declaration for the enum value name. */ | |
7396 | ||
75b46437 | 7397 | type = TREE_TYPE (value); |
b0c48229 NB |
7398 | type = c_common_type_for_size (MAX (TYPE_PRECISION (type), |
7399 | TYPE_PRECISION (integer_type_node)), | |
7400 | (TYPE_PRECISION (type) | |
7401 | >= TYPE_PRECISION (integer_type_node) | |
8df83eae | 7402 | && TYPE_UNSIGNED (type))); |
75b46437 | 7403 | |
c2255bc4 | 7404 | decl = build_decl (loc, CONST_DECL, name, type); |
0543d026 | 7405 | DECL_INITIAL (decl) = convert (type, value); |
51e29401 RS |
7406 | pushdecl (decl); |
7407 | ||
4dd7201e | 7408 | return tree_cons (decl, value, NULL_TREE); |
51e29401 | 7409 | } |
8f17b5c5 | 7410 | |
51e29401 RS |
7411 | \f |
7412 | /* Create the FUNCTION_DECL for a function definition. | |
f7a4cec0 | 7413 | DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of |
5730cf69 | 7414 | the declaration; they describe the function's name and the type it returns, |
51e29401 RS |
7415 | but twisted together in a fashion that parallels the syntax of C. |
7416 | ||
7417 | This function creates a binding context for the function body | |
7418 | as well as setting up the FUNCTION_DECL in current_function_decl. | |
7419 | ||
7420 | Returns 1 on success. If the DECLARATOR is not suitable for a function | |
7421 | (it defines a datum instead), we return 0, which tells | |
4dd7201e | 7422 | yyparse to report a parse error. */ |
51e29401 RS |
7423 | |
7424 | int | |
deb176fa | 7425 | start_function (struct c_declspecs *declspecs, struct c_declarator *declarator, |
f8893e47 | 7426 | tree attributes) |
51e29401 RS |
7427 | { |
7428 | tree decl1, old_decl; | |
b785f485 | 7429 | tree restype, resdecl; |
c2255bc4 | 7430 | location_t loc; |
51e29401 | 7431 | |
0f41302f | 7432 | current_function_returns_value = 0; /* Assume, until we see it does. */ |
51e29401 | 7433 | current_function_returns_null = 0; |
5ce89b2e | 7434 | current_function_returns_abnormally = 0; |
51e29401 | 7435 | warn_about_return_type = 0; |
506e2710 RH |
7436 | c_switch_stack = NULL; |
7437 | ||
7438 | /* Indicate no valid break/continue context by setting these variables | |
7439 | to some non-null, non-label value. We'll notice and emit the proper | |
7440 | error message in c_finish_bc_stmt. */ | |
7441 | c_break_label = c_cont_label = size_zero_node; | |
51e29401 | 7442 | |
0da300cd | 7443 | decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL, |
928c19bb | 7444 | &attributes, NULL, NULL, DEPRECATED_NORMAL); |
51e29401 RS |
7445 | |
7446 | /* If the declarator is not suitable for a function definition, | |
7447 | cause a syntax error. */ | |
7448 | if (decl1 == 0) | |
e1b7793c | 7449 | return 0; |
51e29401 | 7450 | |
c2255bc4 AH |
7451 | loc = DECL_SOURCE_LOCATION (decl1); |
7452 | ||
59387d2e | 7453 | decl_attributes (&decl1, attributes, 0); |
7665dfd4 | 7454 | |
9162542e AO |
7455 | if (DECL_DECLARED_INLINE_P (decl1) |
7456 | && DECL_UNINLINABLE (decl1) | |
7457 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1))) | |
c2255bc4 AH |
7458 | warning_at (loc, OPT_Wattributes, |
7459 | "inline function %qD given attribute noinline", | |
7460 | decl1); | |
9162542e | 7461 | |
4eb7fd83 JJ |
7462 | /* Handle gnu_inline attribute. */ |
7463 | if (declspecs->inline_p | |
da1c7394 | 7464 | && !flag_gnu89_inline |
4eb7fd83 | 7465 | && TREE_CODE (decl1) == FUNCTION_DECL |
6cf59865 JJ |
7466 | && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1)) |
7467 | || current_function_decl)) | |
4eb7fd83 JJ |
7468 | { |
7469 | if (declspecs->storage_class != csc_static) | |
7470 | DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1); | |
7471 | } | |
4eb7fd83 | 7472 | |
51e29401 RS |
7473 | announce_function (decl1); |
7474 | ||
d0f062fb | 7475 | if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1)))) |
51e29401 | 7476 | { |
c2255bc4 | 7477 | error_at (loc, "return type is an incomplete type"); |
51e29401 RS |
7478 | /* Make it return void instead. */ |
7479 | TREE_TYPE (decl1) | |
7480 | = build_function_type (void_type_node, | |
7481 | TYPE_ARG_TYPES (TREE_TYPE (decl1))); | |
7482 | } | |
7483 | ||
7484 | if (warn_about_return_type) | |
b8698a0f | 7485 | pedwarn_c99 (loc, flag_isoc99 ? 0 |
fcf73884 MLI |
7486 | : (warn_return_type ? OPT_Wreturn_type : OPT_Wimplicit_int), |
7487 | "return type defaults to %<int%>"); | |
51e29401 | 7488 | |
51e29401 | 7489 | /* Make the init_value nonzero so pushdecl knows this is not tentative. |
f75fbaf7 | 7490 | error_mark_node is replaced below (in pop_scope) with the BLOCK. */ |
51e29401 RS |
7491 | DECL_INITIAL (decl1) = error_mark_node; |
7492 | ||
c4712597 SZ |
7493 | /* A nested function is not global. */ |
7494 | if (current_function_decl != 0) | |
7495 | TREE_PUBLIC (decl1) = 0; | |
7496 | ||
51e29401 | 7497 | /* If this definition isn't a prototype and we had a prototype declaration |
46097c76 | 7498 | before, copy the arg type info from that prototype. */ |
f75fbaf7 | 7499 | old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope); |
d8890adf JM |
7500 | if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL) |
7501 | old_decl = 0; | |
6fb58bba JM |
7502 | current_function_prototype_locus = UNKNOWN_LOCATION; |
7503 | current_function_prototype_built_in = false; | |
7504 | current_function_prototype_arg_types = NULL_TREE; | |
7505 | if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0) | |
7506 | { | |
7507 | if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE | |
7508 | && comptypes (TREE_TYPE (TREE_TYPE (decl1)), | |
7509 | TREE_TYPE (TREE_TYPE (old_decl)))) | |
7510 | { | |
7511 | TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl), | |
7512 | TREE_TYPE (decl1)); | |
7513 | current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl); | |
7514 | current_function_prototype_built_in | |
7515 | = C_DECL_BUILTIN_PROTOTYPE (old_decl); | |
7516 | current_function_prototype_arg_types | |
7517 | = TYPE_ARG_TYPES (TREE_TYPE (decl1)); | |
7518 | } | |
7519 | if (TREE_PUBLIC (decl1)) | |
7520 | { | |
7521 | /* If there is an external prototype declaration of this | |
7522 | function, record its location but do not copy information | |
7523 | to this decl. This may be an invisible declaration | |
7524 | (built-in or in a scope which has finished) or simply | |
7525 | have more refined argument types than any declaration | |
7526 | found above. */ | |
7527 | struct c_binding *b; | |
7528 | for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed) | |
7529 | if (B_IN_SCOPE (b, external_scope)) | |
7530 | break; | |
7531 | if (b) | |
7532 | { | |
7533 | tree ext_decl, ext_type; | |
7534 | ext_decl = b->decl; | |
e1b7793c | 7535 | ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl); |
6fb58bba JM |
7536 | if (TREE_CODE (ext_type) == FUNCTION_TYPE |
7537 | && comptypes (TREE_TYPE (TREE_TYPE (decl1)), | |
7538 | TREE_TYPE (ext_type))) | |
7539 | { | |
7540 | current_function_prototype_locus | |
7541 | = DECL_SOURCE_LOCATION (ext_decl); | |
7542 | current_function_prototype_built_in | |
7543 | = C_DECL_BUILTIN_PROTOTYPE (ext_decl); | |
7544 | current_function_prototype_arg_types | |
7545 | = TYPE_ARG_TYPES (ext_type); | |
7546 | } | |
7547 | } | |
7548 | } | |
50a9145c | 7549 | } |
51e29401 RS |
7550 | |
7551 | /* Optionally warn of old-fashioned def with no previous prototype. */ | |
7552 | if (warn_strict_prototypes | |
1e55c0e2 | 7553 | && old_decl != error_mark_node |
51e29401 | 7554 | && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0 |
339a28b9 | 7555 | && C_DECL_ISNT_PROTOTYPE (old_decl)) |
c2255bc4 AH |
7556 | warning_at (loc, OPT_Wstrict_prototypes, |
7557 | "function declaration isn%'t a prototype"); | |
51e29401 RS |
7558 | /* Optionally warn of any global def with no previous prototype. */ |
7559 | else if (warn_missing_prototypes | |
1e55c0e2 | 7560 | && old_decl != error_mark_node |
51e29401 | 7561 | && TREE_PUBLIC (decl1) |
3f75a254 | 7562 | && !MAIN_NAME_P (DECL_NAME (decl1)) |
339a28b9 | 7563 | && C_DECL_ISNT_PROTOTYPE (old_decl)) |
c2255bc4 AH |
7564 | warning_at (loc, OPT_Wmissing_prototypes, |
7565 | "no previous prototype for %qD", decl1); | |
51e29401 RS |
7566 | /* Optionally warn of any def with no previous prototype |
7567 | if the function has already been used. */ | |
7568 | else if (warn_missing_prototypes | |
1e55c0e2 JM |
7569 | && old_decl != 0 |
7570 | && old_decl != error_mark_node | |
7571 | && TREE_USED (old_decl) | |
6fc7c517 | 7572 | && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0) |
c2255bc4 AH |
7573 | warning_at (loc, OPT_Wmissing_prototypes, |
7574 | "%qD was used with no prototype before its definition", decl1); | |
1474fe46 RK |
7575 | /* Optionally warn of any global def with no previous declaration. */ |
7576 | else if (warn_missing_declarations | |
7577 | && TREE_PUBLIC (decl1) | |
7578 | && old_decl == 0 | |
3f75a254 | 7579 | && !MAIN_NAME_P (DECL_NAME (decl1))) |
c2255bc4 AH |
7580 | warning_at (loc, OPT_Wmissing_declarations, |
7581 | "no previous declaration for %qD", | |
7582 | decl1); | |
1474fe46 RK |
7583 | /* Optionally warn of any def with no previous declaration |
7584 | if the function has already been used. */ | |
7585 | else if (warn_missing_declarations | |
1e55c0e2 JM |
7586 | && old_decl != 0 |
7587 | && old_decl != error_mark_node | |
7588 | && TREE_USED (old_decl) | |
339a28b9 | 7589 | && C_DECL_IMPLICIT (old_decl)) |
c2255bc4 AH |
7590 | warning_at (loc, OPT_Wmissing_declarations, |
7591 | "%qD was used with no declaration before its definition", decl1); | |
51e29401 | 7592 | |
51e29401 RS |
7593 | /* This function exists in static storage. |
7594 | (This does not mean `static' in the C sense!) */ | |
7595 | TREE_STATIC (decl1) = 1; | |
7596 | ||
d05cc98e GK |
7597 | /* This is the earliest point at which we might know the assembler |
7598 | name of the function. Thus, if it's set before this, die horribly. */ | |
366de0ce | 7599 | gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1)); |
d05cc98e GK |
7600 | |
7601 | /* If #pragma weak was used, mark the decl weak now. */ | |
f75fbaf7 | 7602 | if (current_scope == file_scope) |
d05cc98e GK |
7603 | maybe_apply_pragma_weak (decl1); |
7604 | ||
6645c3fa | 7605 | /* Warn for unlikely, improbable, or stupid declarations of `main'. */ |
4003301d | 7606 | if (warn_main && MAIN_NAME_P (DECL_NAME (decl1))) |
b8705e61 | 7607 | { |
b8705e61 | 7608 | if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1))) |
6645c3fa | 7609 | != integer_type_node) |
c2255bc4 | 7610 | pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1); |
b8705e61 | 7611 | |
4003301d | 7612 | check_main_parameter_types (decl1); |
b8705e61 | 7613 | |
3f75a254 | 7614 | if (!TREE_PUBLIC (decl1)) |
c2255bc4 AH |
7615 | pedwarn (loc, OPT_Wmain, |
7616 | "%qD is normally a non-static function", decl1); | |
b8705e61 RK |
7617 | } |
7618 | ||
51e29401 RS |
7619 | /* Record the decl so that the function name is defined. |
7620 | If we already have a decl for this name, and it is a FUNCTION_DECL, | |
7621 | use the old decl. */ | |
7622 | ||
7623 | current_function_decl = pushdecl (decl1); | |
7624 | ||
f75fbaf7 | 7625 | push_scope (); |
eb1dfbb2 | 7626 | declare_parm_level (); |
51e29401 | 7627 | |
51e29401 | 7628 | restype = TREE_TYPE (TREE_TYPE (current_function_decl)); |
c2255bc4 | 7629 | resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype); |
b785f485 RH |
7630 | DECL_ARTIFICIAL (resdecl) = 1; |
7631 | DECL_IGNORED_P (resdecl) = 1; | |
7632 | DECL_RESULT (current_function_decl) = resdecl; | |
51e29401 | 7633 | |
0ba8a114 | 7634 | start_fname_decls (); |
35b1a6fa | 7635 | |
51e29401 RS |
7636 | return 1; |
7637 | } | |
51e29401 | 7638 | \f |
66db6b62 ZW |
7639 | /* Subroutine of store_parm_decls which handles new-style function |
7640 | definitions (prototype format). The parms already have decls, so we | |
7641 | need only record them as in effect and complain if any redundant | |
7642 | old-style parm decls were written. */ | |
d4e43dff | 7643 | static void |
f8893e47 | 7644 | store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info) |
51e29401 | 7645 | { |
f75fbaf7 | 7646 | tree decl; |
51e29401 | 7647 | |
f75fbaf7 | 7648 | if (current_scope->bindings) |
66db6b62 | 7649 | { |
c5d75364 MLI |
7650 | error_at (DECL_SOURCE_LOCATION (fndecl), |
7651 | "old-style parameter declarations in prototyped " | |
7652 | "function definition"); | |
51e29401 | 7653 | |
66db6b62 | 7654 | /* Get rid of the old-style declarations. */ |
f75fbaf7 ZW |
7655 | pop_scope (); |
7656 | push_scope (); | |
7657 | } | |
7658 | /* Don't issue this warning for nested functions, and don't issue this | |
7659 | warning if we got here because ARG_INFO_TYPES was error_mark_node | |
7660 | (this happens when a function definition has just an ellipsis in | |
7661 | its parameter list). */ | |
3176a0c2 | 7662 | else if (!in_system_header && !current_function_scope |
f8893e47 | 7663 | && arg_info->types != error_mark_node) |
c5d75364 MLI |
7664 | warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional, |
7665 | "traditional C rejects ISO C style function definitions"); | |
51e29401 | 7666 | |
55d54003 ZW |
7667 | /* Now make all the parameter declarations visible in the function body. |
7668 | We can bypass most of the grunt work of pushdecl. */ | |
f8893e47 | 7669 | for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl)) |
66db6b62 | 7670 | { |
55d54003 | 7671 | DECL_CONTEXT (decl) = current_function_decl; |
f75fbaf7 | 7672 | if (DECL_NAME (decl)) |
7c47d6e9 JM |
7673 | { |
7674 | bind (DECL_NAME (decl), decl, current_scope, | |
b3f27c15 JJ |
7675 | /*invisible=*/false, /*nested=*/false, |
7676 | UNKNOWN_LOCATION); | |
7c47d6e9 JM |
7677 | if (!TREE_USED (decl)) |
7678 | warn_if_shadowing (decl); | |
7679 | } | |
66db6b62 | 7680 | else |
c5d75364 | 7681 | error_at (DECL_SOURCE_LOCATION (decl), "parameter name omitted"); |
66db6b62 | 7682 | } |
26f943fd | 7683 | |
66db6b62 | 7684 | /* Record the parameter list in the function declaration. */ |
f8893e47 | 7685 | DECL_ARGUMENTS (fndecl) = arg_info->parms; |
51e29401 | 7686 | |
66db6b62 | 7687 | /* Now make all the ancillary declarations visible, likewise. */ |
f8893e47 | 7688 | for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl)) |
55d54003 ZW |
7689 | { |
7690 | DECL_CONTEXT (decl) = current_function_decl; | |
f75fbaf7 | 7691 | if (DECL_NAME (decl)) |
9aaabf8a | 7692 | bind (DECL_NAME (decl), decl, current_scope, |
10e76c1a JM |
7693 | /*invisible=*/false, |
7694 | /*nested=*/(TREE_CODE (decl) == FUNCTION_DECL), | |
7695 | UNKNOWN_LOCATION); | |
55d54003 | 7696 | } |
26f943fd | 7697 | |
66db6b62 | 7698 | /* And all the tag declarations. */ |
f8893e47 | 7699 | for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl)) |
55d54003 | 7700 | if (TREE_PURPOSE (decl)) |
9aaabf8a | 7701 | bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope, |
b3f27c15 | 7702 | /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION); |
66db6b62 | 7703 | } |
1f731749 | 7704 | |
66db6b62 ZW |
7705 | /* Subroutine of store_parm_decls which handles old-style function |
7706 | definitions (separate parameter list and declarations). */ | |
51e29401 | 7707 | |
66db6b62 | 7708 | static void |
f8893e47 | 7709 | store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info) |
66db6b62 | 7710 | { |
f75fbaf7 | 7711 | struct c_binding *b; |
55d54003 | 7712 | tree parm, decl, last; |
f8893e47 | 7713 | tree parmids = arg_info->parms; |
820cc88f | 7714 | struct pointer_set_t *seen_args = pointer_set_create (); |
66db6b62 | 7715 | |
ccf08a6e | 7716 | if (!in_system_header) |
c2255bc4 AH |
7717 | warning_at (DECL_SOURCE_LOCATION (fndecl), |
7718 | OPT_Wold_style_definition, "old-style function definition"); | |
f75fbaf7 | 7719 | |
66db6b62 ZW |
7720 | /* Match each formal parameter name with its declaration. Save each |
7721 | decl in the appropriate TREE_PURPOSE slot of the parmids chain. */ | |
7722 | for (parm = parmids; parm; parm = TREE_CHAIN (parm)) | |
7723 | { | |
7724 | if (TREE_VALUE (parm) == 0) | |
7a0347ff | 7725 | { |
c2255bc4 AH |
7726 | error_at (DECL_SOURCE_LOCATION (fndecl), |
7727 | "parameter name missing from parameter list"); | |
66db6b62 ZW |
7728 | TREE_PURPOSE (parm) = 0; |
7729 | continue; | |
7a0347ff | 7730 | } |
51e29401 | 7731 | |
f75fbaf7 | 7732 | b = I_SYMBOL_BINDING (TREE_VALUE (parm)); |
9aaabf8a | 7733 | if (b && B_IN_CURRENT_SCOPE (b)) |
51e29401 | 7734 | { |
f75fbaf7 | 7735 | decl = b->decl; |
66db6b62 ZW |
7736 | /* If we got something other than a PARM_DECL it is an error. */ |
7737 | if (TREE_CODE (decl) != PARM_DECL) | |
c2255bc4 AH |
7738 | error_at (DECL_SOURCE_LOCATION (decl), |
7739 | "%qD declared as a non-parameter", decl); | |
66db6b62 ZW |
7740 | /* If the declaration is already marked, we have a duplicate |
7741 | name. Complain and ignore the duplicate. */ | |
820cc88f | 7742 | else if (pointer_set_contains (seen_args, decl)) |
51e29401 | 7743 | { |
c2255bc4 AH |
7744 | error_at (DECL_SOURCE_LOCATION (decl), |
7745 | "multiple parameters named %qD", decl); | |
66db6b62 ZW |
7746 | TREE_PURPOSE (parm) = 0; |
7747 | continue; | |
51e29401 | 7748 | } |
66db6b62 ZW |
7749 | /* If the declaration says "void", complain and turn it into |
7750 | an int. */ | |
7751 | else if (VOID_TYPE_P (TREE_TYPE (decl))) | |
51e29401 | 7752 | { |
c2255bc4 AH |
7753 | error_at (DECL_SOURCE_LOCATION (decl), |
7754 | "parameter %qD declared with void type", decl); | |
66db6b62 ZW |
7755 | TREE_TYPE (decl) = integer_type_node; |
7756 | DECL_ARG_TYPE (decl) = integer_type_node; | |
7757 | layout_decl (decl, 0); | |
51e29401 | 7758 | } |
7c47d6e9 | 7759 | warn_if_shadowing (decl); |
51e29401 | 7760 | } |
66db6b62 ZW |
7761 | /* If no declaration found, default to int. */ |
7762 | else | |
51e29401 | 7763 | { |
c2255bc4 AH |
7764 | /* FIXME diagnostics: This should be the location of the argument, |
7765 | not the FNDECL. E.g., for an old-style declaration | |
7766 | ||
7767 | int f10(v) { blah; } | |
7768 | ||
7769 | We should use the location of the V, not the F10. | |
7770 | Unfortunately, the V is an IDENTIFIER_NODE which has no | |
7771 | location. In the future we need locations for c_arg_info | |
7772 | entries. | |
7773 | ||
7774 | See gcc.dg/Wshadow-3.c for an example of this problem. */ | |
7775 | decl = build_decl (DECL_SOURCE_LOCATION (fndecl), | |
7776 | PARM_DECL, TREE_VALUE (parm), integer_type_node); | |
66db6b62 | 7777 | DECL_ARG_TYPE (decl) = TREE_TYPE (decl); |
66db6b62 | 7778 | pushdecl (decl); |
7c47d6e9 | 7779 | warn_if_shadowing (decl); |
66db6b62 ZW |
7780 | |
7781 | if (flag_isoc99) | |
c2255bc4 AH |
7782 | pedwarn (DECL_SOURCE_LOCATION (decl), |
7783 | 0, "type of %qD defaults to %<int%>", decl); | |
b8698a0f | 7784 | else |
c2255bc4 AH |
7785 | warning_at (DECL_SOURCE_LOCATION (decl), |
7786 | OPT_Wmissing_parameter_type, | |
7787 | "type of %qD defaults to %<int%>", decl); | |
51e29401 RS |
7788 | } |
7789 | ||
66db6b62 | 7790 | TREE_PURPOSE (parm) = decl; |
820cc88f | 7791 | pointer_set_insert (seen_args, decl); |
51e29401 | 7792 | } |
51e29401 | 7793 | |
55d54003 ZW |
7794 | /* Now examine the parms chain for incomplete declarations |
7795 | and declarations with no corresponding names. */ | |
51e29401 | 7796 | |
f75fbaf7 | 7797 | for (b = current_scope->bindings; b; b = b->prev) |
66db6b62 | 7798 | { |
f75fbaf7 ZW |
7799 | parm = b->decl; |
7800 | if (TREE_CODE (parm) != PARM_DECL) | |
7801 | continue; | |
7802 | ||
559f2da5 RH |
7803 | if (TREE_TYPE (parm) != error_mark_node |
7804 | && !COMPLETE_TYPE_P (TREE_TYPE (parm))) | |
51e29401 | 7805 | { |
c2255bc4 AH |
7806 | error_at (DECL_SOURCE_LOCATION (parm), |
7807 | "parameter %qD has incomplete type", parm); | |
66db6b62 ZW |
7808 | TREE_TYPE (parm) = error_mark_node; |
7809 | } | |
51e29401 | 7810 | |
820cc88f | 7811 | if (!pointer_set_contains (seen_args, parm)) |
66db6b62 | 7812 | { |
c2255bc4 AH |
7813 | error_at (DECL_SOURCE_LOCATION (parm), |
7814 | "declaration for parameter %qD but no such parameter", | |
7815 | parm); | |
51e29401 | 7816 | |
66db6b62 ZW |
7817 | /* Pretend the parameter was not missing. |
7818 | This gets us to a standard state and minimizes | |
7819 | further error messages. */ | |
7820 | parmids = chainon (parmids, tree_cons (parm, 0, 0)); | |
51e29401 | 7821 | } |
66db6b62 | 7822 | } |
51e29401 | 7823 | |
66db6b62 ZW |
7824 | /* Chain the declarations together in the order of the list of |
7825 | names. Store that chain in the function decl, replacing the | |
55d54003 | 7826 | list of names. Update the current scope to match. */ |
66db6b62 | 7827 | DECL_ARGUMENTS (fndecl) = 0; |
66db6b62 | 7828 | |
55d54003 ZW |
7829 | for (parm = parmids; parm; parm = TREE_CHAIN (parm)) |
7830 | if (TREE_PURPOSE (parm)) | |
7831 | break; | |
7832 | if (parm && TREE_PURPOSE (parm)) | |
7833 | { | |
7834 | last = TREE_PURPOSE (parm); | |
7835 | DECL_ARGUMENTS (fndecl) = last; | |
55d54003 ZW |
7836 | |
7837 | for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm)) | |
7838 | if (TREE_PURPOSE (parm)) | |
7839 | { | |
7840 | TREE_CHAIN (last) = TREE_PURPOSE (parm); | |
7841 | last = TREE_PURPOSE (parm); | |
55d54003 ZW |
7842 | } |
7843 | TREE_CHAIN (last) = 0; | |
7844 | } | |
51e29401 | 7845 | |
820cc88f DB |
7846 | pointer_set_destroy (seen_args); |
7847 | ||
66db6b62 ZW |
7848 | /* If there was a previous prototype, |
7849 | set the DECL_ARG_TYPE of each argument according to | |
7850 | the type previously specified, and report any mismatches. */ | |
51e29401 | 7851 | |
6fb58bba | 7852 | if (current_function_prototype_arg_types) |
66db6b62 ZW |
7853 | { |
7854 | tree type; | |
7855 | for (parm = DECL_ARGUMENTS (fndecl), | |
6fb58bba | 7856 | type = current_function_prototype_arg_types; |
f1f66b42 LM |
7857 | parm || (type && TREE_VALUE (type) != error_mark_node |
7858 | && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node)); | |
66db6b62 | 7859 | parm = TREE_CHAIN (parm), type = TREE_CHAIN (type)) |
51e29401 | 7860 | { |
66db6b62 ZW |
7861 | if (parm == 0 || type == 0 |
7862 | || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node) | |
51e29401 | 7863 | { |
6fb58bba | 7864 | if (current_function_prototype_built_in) |
c2255bc4 AH |
7865 | warning_at (DECL_SOURCE_LOCATION (fndecl), |
7866 | 0, "number of arguments doesn%'t match " | |
7867 | "built-in prototype"); | |
6fb58bba JM |
7868 | else |
7869 | { | |
c2255bc4 AH |
7870 | /* FIXME diagnostics: This should be the location of |
7871 | FNDECL, but there is bug when a prototype is | |
7872 | declared inside function context, but defined | |
7873 | outside of it (e.g., gcc.dg/pr15698-2.c). In | |
7874 | which case FNDECL gets the location of the | |
7875 | prototype, not the definition. */ | |
7876 | error_at (input_location, | |
7877 | "number of arguments doesn%'t match prototype"); | |
7878 | ||
7879 | error_at (current_function_prototype_locus, | |
7880 | "prototype declaration"); | |
6fb58bba | 7881 | } |
66db6b62 ZW |
7882 | break; |
7883 | } | |
7884 | /* Type for passing arg must be consistent with that | |
7885 | declared for the arg. ISO C says we take the unqualified | |
7886 | type for parameters declared with qualified type. */ | |
bb686a19 VR |
7887 | if (TREE_TYPE (parm) != error_mark_node |
7888 | && TREE_TYPE (type) != error_mark_node | |
7889 | && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)), | |
7890 | TYPE_MAIN_VARIANT (TREE_VALUE (type)))) | |
66db6b62 ZW |
7891 | { |
7892 | if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) | |
7893 | == TYPE_MAIN_VARIANT (TREE_VALUE (type))) | |
51e29401 | 7894 | { |
66db6b62 ZW |
7895 | /* Adjust argument to match prototype. E.g. a previous |
7896 | `int foo(float);' prototype causes | |
7897 | `int foo(x) float x; {...}' to be treated like | |
7898 | `int foo(float x) {...}'. This is particularly | |
7899 | useful for argument types like uid_t. */ | |
7900 | DECL_ARG_TYPE (parm) = TREE_TYPE (parm); | |
7901 | ||
61f71b34 | 7902 | if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl)) |
66db6b62 ZW |
7903 | && INTEGRAL_TYPE_P (TREE_TYPE (parm)) |
7904 | && TYPE_PRECISION (TREE_TYPE (parm)) | |
7905 | < TYPE_PRECISION (integer_type_node)) | |
7906 | DECL_ARG_TYPE (parm) = integer_type_node; | |
7907 | ||
fcf73884 MLI |
7908 | /* ??? Is it possible to get here with a |
7909 | built-in prototype or will it always have | |
7910 | been diagnosed as conflicting with an | |
7911 | old-style definition and discarded? */ | |
7912 | if (current_function_prototype_built_in) | |
c2255bc4 AH |
7913 | warning_at (DECL_SOURCE_LOCATION (parm), |
7914 | OPT_pedantic, "promoted argument %qD " | |
7915 | "doesn%'t match built-in prototype", parm); | |
fcf73884 | 7916 | else |
50a9145c | 7917 | { |
c2255bc4 AH |
7918 | pedwarn (DECL_SOURCE_LOCATION (parm), |
7919 | OPT_pedantic, "promoted argument %qD " | |
fcf73884 | 7920 | "doesn%'t match prototype", parm); |
509c9d60 MLI |
7921 | pedwarn (current_function_prototype_locus, OPT_pedantic, |
7922 | "prototype declaration"); | |
50a9145c | 7923 | } |
51e29401 | 7924 | } |
66db6b62 ZW |
7925 | else |
7926 | { | |
6fb58bba | 7927 | if (current_function_prototype_built_in) |
c2255bc4 AH |
7928 | warning_at (DECL_SOURCE_LOCATION (parm), |
7929 | 0, "argument %qD doesn%'t match " | |
7930 | "built-in prototype", parm); | |
6fb58bba JM |
7931 | else |
7932 | { | |
c2255bc4 AH |
7933 | error_at (DECL_SOURCE_LOCATION (parm), |
7934 | "argument %qD doesn%'t match prototype", parm); | |
7935 | error_at (current_function_prototype_locus, | |
7936 | "prototype declaration"); | |
6fb58bba | 7937 | } |
66db6b62 | 7938 | } |
51e29401 | 7939 | } |
51e29401 | 7940 | } |
66db6b62 ZW |
7941 | TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0; |
7942 | } | |
51e29401 | 7943 | |
66db6b62 | 7944 | /* Otherwise, create a prototype that would match. */ |
51e29401 | 7945 | |
66db6b62 ZW |
7946 | else |
7947 | { | |
7948 | tree actual = 0, last = 0, type; | |
51e29401 | 7949 | |
66db6b62 ZW |
7950 | for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm)) |
7951 | { | |
7952 | type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE); | |
51e29401 RS |
7953 | if (last) |
7954 | TREE_CHAIN (last) = type; | |
7955 | else | |
7956 | actual = type; | |
66db6b62 ZW |
7957 | last = type; |
7958 | } | |
7959 | type = tree_cons (NULL_TREE, void_type_node, NULL_TREE); | |
7960 | if (last) | |
7961 | TREE_CHAIN (last) = type; | |
7962 | else | |
7963 | actual = type; | |
51e29401 | 7964 | |
66db6b62 ZW |
7965 | /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES |
7966 | of the type of this function, but we need to avoid having this | |
7967 | affect the types of other similarly-typed functions, so we must | |
7968 | first force the generation of an identical (but separate) type | |
7969 | node for the relevant function type. The new node we create | |
7970 | will be a variant of the main variant of the original function | |
7971 | type. */ | |
c138f328 | 7972 | |
8dd16ecc | 7973 | TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl)); |
c138f328 | 7974 | |
66db6b62 ZW |
7975 | TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual; |
7976 | } | |
66db6b62 ZW |
7977 | } |
7978 | ||
d4e43dff ZL |
7979 | /* Store parameter declarations passed in ARG_INFO into the current |
7980 | function declaration. */ | |
7981 | ||
7982 | void | |
f8893e47 | 7983 | store_parm_decls_from (struct c_arg_info *arg_info) |
d4e43dff ZL |
7984 | { |
7985 | current_function_arg_info = arg_info; | |
7986 | store_parm_decls (); | |
7987 | } | |
7988 | ||
66db6b62 ZW |
7989 | /* Store the parameter declarations into the current function declaration. |
7990 | This is called after parsing the parameter declarations, before | |
7991 | digesting the body of the function. | |
7992 | ||
7993 | For an old-style definition, construct a prototype out of the old-style | |
7994 | parameter declarations and inject it into the function's type. */ | |
7995 | ||
7996 | void | |
7997 | store_parm_decls (void) | |
7998 | { | |
7999 | tree fndecl = current_function_decl; | |
7b112487 | 8000 | bool proto; |
66db6b62 | 8001 | |
77dbdb57 | 8002 | /* The argument information block for FNDECL. */ |
f8893e47 | 8003 | struct c_arg_info *arg_info = current_function_arg_info; |
7b112487 | 8004 | current_function_arg_info = 0; |
77dbdb57 | 8005 | |
f75fbaf7 ZW |
8006 | /* True if this definition is written with a prototype. Note: |
8007 | despite C99 6.7.5.3p14, we can *not* treat an empty argument | |
8008 | list in a function definition as equivalent to (void) -- an | |
8009 | empty argument list specifies the function has no parameters, | |
8010 | but only (void) sets up a prototype for future calls. */ | |
f8893e47 | 8011 | proto = arg_info->types != 0; |
66db6b62 | 8012 | |
f75fbaf7 | 8013 | if (proto) |
77dbdb57 | 8014 | store_parm_decls_newstyle (fndecl, arg_info); |
66db6b62 | 8015 | else |
77dbdb57 | 8016 | store_parm_decls_oldstyle (fndecl, arg_info); |
51e29401 | 8017 | |
f75fbaf7 | 8018 | /* The next call to push_scope will be a function body. */ |
51e29401 | 8019 | |
a8ccdffe | 8020 | next_is_function_body = true; |
51e29401 | 8021 | |
51e29401 RS |
8022 | /* Write a record describing this function definition to the prototypes |
8023 | file (if requested). */ | |
8024 | ||
f75fbaf7 | 8025 | gen_aux_info_record (fndecl, 1, 0, proto); |
51e29401 RS |
8026 | |
8027 | /* Initialize the RTL code for the function. */ | |
182e0d71 | 8028 | allocate_struct_function (fndecl, false); |
51e29401 | 8029 | |
8f17b5c5 | 8030 | /* Begin the statement tree for this function. */ |
325c3691 | 8031 | DECL_SAVED_TREE (fndecl) = push_stmt_list (); |
51e29401 | 8032 | |
82c82743 | 8033 | /* ??? Insert the contents of the pending sizes list into the function |
4744afba RH |
8034 | to be evaluated. The only reason left to have this is |
8035 | void foo(int n, int array[n++]) | |
8036 | because we throw away the array type in favor of a pointer type, and | |
8037 | thus won't naturally see the SAVE_EXPR containing the increment. All | |
8038 | other pending sizes would be handled by gimplify_parameters. */ | |
82c82743 | 8039 | { |
50701474 | 8040 | VEC(tree,gc) *pending_sizes = get_pending_sizes (); |
82c82743 | 8041 | tree t; |
50701474 SB |
8042 | int i; |
8043 | ||
8044 | for (i = 0; VEC_iterate (tree, pending_sizes, i, t); i++) | |
8045 | add_stmt (t); | |
82c82743 | 8046 | } |
1f731749 | 8047 | |
8f17b5c5 MM |
8048 | /* Even though we're inside a function body, we still don't want to |
8049 | call expand_expr to calculate the size of a variable-sized array. | |
8050 | We haven't necessarily assigned RTL to all variables yet, so it's | |
8051 | not safe to try to expand expressions involving them. */ | |
e3b5732b | 8052 | cfun->dont_save_pending_sizes_p = 1; |
51e29401 RS |
8053 | } |
8054 | \f | |
6de9cd9a | 8055 | |
51e29401 RS |
8056 | /* Finish up a function declaration and compile that function |
8057 | all the way to assembler language output. The free the storage | |
8058 | for the function definition. | |
8059 | ||
4a46cbfb | 8060 | This is called after parsing the body of the function definition. */ |
51e29401 RS |
8061 | |
8062 | void | |
edaf3e03 | 8063 | finish_function (void) |
51e29401 | 8064 | { |
b3694847 | 8065 | tree fndecl = current_function_decl; |
51e29401 | 8066 | |
61f71b34 DD |
8067 | if (TREE_CODE (fndecl) == FUNCTION_DECL |
8068 | && targetm.calls.promote_prototypes (TREE_TYPE (fndecl))) | |
8069 | { | |
8070 | tree args = DECL_ARGUMENTS (fndecl); | |
8071 | for (; args; args = TREE_CHAIN (args)) | |
c22cacf3 MS |
8072 | { |
8073 | tree type = TREE_TYPE (args); | |
8074 | if (INTEGRAL_TYPE_P (type) | |
8075 | && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) | |
8076 | DECL_ARG_TYPE (args) = integer_type_node; | |
8077 | } | |
61f71b34 DD |
8078 | } |
8079 | ||
67b28863 | 8080 | if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node) |
af3fbed1 | 8081 | BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl; |
51e29401 RS |
8082 | |
8083 | /* Must mark the RESULT_DECL as being in this function. */ | |
8084 | ||
67b28863 | 8085 | if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node) |
af3fbed1 | 8086 | DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl; |
51e29401 | 8087 | |
4003301d MLI |
8088 | if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted |
8089 | && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) | |
8090 | == integer_type_node && flag_isoc99) | |
8091 | { | |
4003301d MLI |
8092 | /* Hack. We don't want the middle-end to warn that this return |
8093 | is unreachable, so we mark its location as special. Using | |
8094 | UNKNOWN_LOCATION has the problem that it gets clobbered in | |
8095 | annotate_one_with_locus. A cleaner solution might be to | |
8096 | ensure ! should_carry_locus_p (stmt), but that needs a flag. | |
8097 | */ | |
c2255bc4 | 8098 | c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE); |
51e29401 | 8099 | } |
35b1a6fa | 8100 | |
8f17b5c5 | 8101 | /* Tie off the statement tree for this function. */ |
325c3691 RH |
8102 | DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl)); |
8103 | ||
8104 | finish_fname_decls (); | |
5ce89b2e JM |
8105 | |
8106 | /* Complain if there's just no return statement. */ | |
46cfb101 JM |
8107 | if (warn_return_type |
8108 | && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE | |
5ce89b2e | 8109 | && !current_function_returns_value && !current_function_returns_null |
41806d92 | 8110 | /* Don't complain if we are no-return. */ |
5ce89b2e | 8111 | && !current_function_returns_abnormally |
ef5d1181 JJ |
8112 | /* Don't complain if we are declared noreturn. */ |
8113 | && !TREE_THIS_VOLATILE (fndecl) | |
5ce89b2e JM |
8114 | /* Don't warn for main(). */ |
8115 | && !MAIN_NAME_P (DECL_NAME (fndecl)) | |
8116 | /* Or if they didn't actually specify a return type. */ | |
8117 | && !C_FUNCTION_IMPLICIT_INT (fndecl) | |
7e8b322a JH |
8118 | /* Normally, with -Wreturn-type, flow will complain, but we might |
8119 | optimize out static functions. */ | |
8120 | && !TREE_PUBLIC (fndecl)) | |
9da58884 | 8121 | { |
3176a0c2 DD |
8122 | warning (OPT_Wreturn_type, |
8123 | "no return statement in function returning non-void"); | |
9da58884 JH |
8124 | TREE_NO_WARNING (fndecl) = 1; |
8125 | } | |
5ce89b2e | 8126 | |
ebfbbdc5 JJ |
8127 | /* Complain about parameters that are only set, but never otherwise used. */ |
8128 | if (warn_unused_but_set_parameter) | |
8129 | { | |
8130 | tree decl; | |
8131 | ||
8132 | for (decl = DECL_ARGUMENTS (fndecl); | |
8133 | decl; | |
8134 | decl = TREE_CHAIN (decl)) | |
8135 | if (TREE_USED (decl) | |
8136 | && TREE_CODE (decl) == PARM_DECL | |
8137 | && !DECL_READ_P (decl) | |
8138 | && DECL_NAME (decl) | |
8139 | && !DECL_ARTIFICIAL (decl) | |
8140 | && !TREE_NO_WARNING (decl)) | |
8141 | warning_at (DECL_SOURCE_LOCATION (decl), | |
8142 | OPT_Wunused_but_set_parameter, | |
8143 | "parameter %qD set but not used", decl); | |
8144 | } | |
8145 | ||
6de9cd9a DN |
8146 | /* Store the end of the function, so that we get good line number |
8147 | info for the epilogue. */ | |
8148 | cfun->function_end_locus = input_location; | |
8149 | ||
b2ca3702 MM |
8150 | /* Finalize the ELF visibility for the function. */ |
8151 | c_determine_visibility (fndecl); | |
8152 | ||
c536a6a7 | 8153 | /* For GNU C extern inline functions disregard inline limits. */ |
b8698a0f | 8154 | if (DECL_EXTERNAL (fndecl) |
c536a6a7 RG |
8155 | && DECL_DECLARED_INLINE_P (fndecl)) |
8156 | DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1; | |
8157 | ||
6de9cd9a DN |
8158 | /* Genericize before inlining. Delay genericizing nested functions |
8159 | until their parent function is genericized. Since finalizing | |
8160 | requires GENERIC, delay that as well. */ | |
118a3a8b | 8161 | |
73aea290 JM |
8162 | if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node |
8163 | && !undef_nested_function) | |
6de9cd9a DN |
8164 | { |
8165 | if (!decl_function_context (fndecl)) | |
c22cacf3 | 8166 | { |
1c701f96 | 8167 | invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl); |
c22cacf3 | 8168 | c_genericize (fndecl); |
1a94c545 JH |
8169 | |
8170 | /* ??? Objc emits functions after finalizing the compilation unit. | |
8171 | This should be cleaned up later and this conditional removed. */ | |
8172 | if (cgraph_global_info_ready) | |
8173 | { | |
e89d6010 | 8174 | cgraph_add_new_function (fndecl, false); |
1a94c545 JH |
8175 | return; |
8176 | } | |
1a94c545 | 8177 | cgraph_finalize_function (fndecl, false); |
c22cacf3 | 8178 | } |
6de9cd9a | 8179 | else |
c22cacf3 MS |
8180 | { |
8181 | /* Register this function with cgraph just far enough to get it | |
8182 | added to our parent's nested function list. Handy, since the | |
8183 | C front end doesn't have such a list. */ | |
8184 | (void) cgraph_node (fndecl); | |
8185 | } | |
6de9cd9a DN |
8186 | } |
8187 | ||
73aea290 JM |
8188 | if (!decl_function_context (fndecl)) |
8189 | undef_nested_function = false; | |
8190 | ||
1da326c3 | 8191 | /* We're leaving the context of this function, so zap cfun. |
6de9cd9a | 8192 | It's still in DECL_STRUCT_FUNCTION, and we'll restore it in |
1da326c3 | 8193 | tree_rest_of_compilation. */ |
db2960f4 | 8194 | set_cfun (NULL); |
4a46cbfb | 8195 | current_function_decl = NULL; |
8f17b5c5 | 8196 | } |
51e29401 | 8197 | \f |
77c4d6c0 | 8198 | /* Check the declarations given in a for-loop for satisfying the C99 |
c2255bc4 AH |
8199 | constraints. If exactly one such decl is found, return it. LOC is |
8200 | the location of the opening parenthesis of the for loop. */ | |
953ff289 DN |
8201 | |
8202 | tree | |
c2255bc4 | 8203 | check_for_loop_decls (location_t loc) |
77c4d6c0 | 8204 | { |
f75fbaf7 | 8205 | struct c_binding *b; |
953ff289 DN |
8206 | tree one_decl = NULL_TREE; |
8207 | int n_decls = 0; | |
8208 | ||
77c4d6c0 JM |
8209 | if (!flag_isoc99) |
8210 | { | |
e9527cfd | 8211 | static bool hint = true; |
77c4d6c0 JM |
8212 | /* If we get here, declarations have been used in a for loop without |
8213 | the C99 for loop scope. This doesn't make much sense, so don't | |
8214 | allow it. */ | |
c2255bc4 AH |
8215 | error_at (loc, "%<for%> loop initial declarations " |
8216 | "are only allowed in C99 mode"); | |
e9527cfd MLI |
8217 | if (hint) |
8218 | { | |
c2255bc4 | 8219 | inform (loc, |
e9527cfd MLI |
8220 | "use option -std=c99 or -std=gnu99 to compile your code"); |
8221 | hint = false; | |
8222 | } | |
953ff289 | 8223 | return NULL_TREE; |
77c4d6c0 JM |
8224 | } |
8225 | /* C99 subclause 6.8.5 paragraph 3: | |
8226 | ||
8227 | [#3] The declaration part of a for statement shall only | |
8228 | declare identifiers for objects having storage class auto or | |
8229 | register. | |
8230 | ||
8231 | It isn't clear whether, in this sentence, "identifiers" binds to | |
8232 | "shall only declare" or to "objects" - that is, whether all identifiers | |
8233 | declared must be identifiers for objects, or whether the restriction | |
8234 | only applies to those that are. (A question on this in comp.std.c | |
8235 | in November 2000 received no answer.) We implement the strictest | |
8236 | interpretation, to avoid creating an extension which later causes | |
8237 | problems. */ | |
8238 | ||
f75fbaf7 | 8239 | for (b = current_scope->bindings; b; b = b->prev) |
77c4d6c0 | 8240 | { |
f75fbaf7 ZW |
8241 | tree id = b->id; |
8242 | tree decl = b->decl; | |
53fcdc76 | 8243 | |
f75fbaf7 ZW |
8244 | if (!id) |
8245 | continue; | |
8246 | ||
8247 | switch (TREE_CODE (decl)) | |
8248 | { | |
8249 | case VAR_DECL: | |
c2255bc4 AH |
8250 | { |
8251 | location_t decl_loc = DECL_SOURCE_LOCATION (decl); | |
8252 | if (TREE_STATIC (decl)) | |
8253 | error_at (decl_loc, | |
8254 | "declaration of static variable %qD in %<for%> loop " | |
8255 | "initial declaration", decl); | |
8256 | else if (DECL_EXTERNAL (decl)) | |
8257 | error_at (decl_loc, | |
8258 | "declaration of %<extern%> variable %qD in %<for%> loop " | |
8259 | "initial declaration", decl); | |
8260 | } | |
f75fbaf7 ZW |
8261 | break; |
8262 | ||
8263 | case RECORD_TYPE: | |
c2255bc4 AH |
8264 | error_at (loc, |
8265 | "%<struct %E%> declared in %<for%> loop initial " | |
8266 | "declaration", id); | |
f75fbaf7 ZW |
8267 | break; |
8268 | case UNION_TYPE: | |
c2255bc4 AH |
8269 | error_at (loc, |
8270 | "%<union %E%> declared in %<for%> loop initial declaration", | |
8271 | id); | |
f75fbaf7 ZW |
8272 | break; |
8273 | case ENUMERAL_TYPE: | |
c2255bc4 AH |
8274 | error_at (loc, "%<enum %E%> declared in %<for%> loop " |
8275 | "initial declaration", id); | |
f75fbaf7 ZW |
8276 | break; |
8277 | default: | |
c2255bc4 AH |
8278 | error_at (loc, "declaration of non-variable " |
8279 | "%qD in %<for%> loop initial declaration", decl); | |
f75fbaf7 | 8280 | } |
953ff289 DN |
8281 | |
8282 | n_decls++; | |
8283 | one_decl = decl; | |
77c4d6c0 | 8284 | } |
953ff289 DN |
8285 | |
8286 | return n_decls == 1 ? one_decl : NULL_TREE; | |
77c4d6c0 JM |
8287 | } |
8288 | \f | |
51e29401 RS |
8289 | /* Save and reinitialize the variables |
8290 | used during compilation of a C function. */ | |
8291 | ||
8292 | void | |
d2784db4 | 8293 | c_push_function_context (void) |
51e29401 | 8294 | { |
e2500fed | 8295 | struct language_function *p; |
a9429e29 | 8296 | p = ggc_alloc_language_function (); |
d2784db4 | 8297 | cfun->language = p; |
51e29401 | 8298 | |
8f17b5c5 | 8299 | p->base.x_stmt_tree = c_stmt_tree; |
506e2710 RH |
8300 | p->x_break_label = c_break_label; |
8301 | p->x_cont_label = c_cont_label; | |
8302 | p->x_switch_stack = c_switch_stack; | |
7b112487 | 8303 | p->arg_info = current_function_arg_info; |
51e29401 RS |
8304 | p->returns_value = current_function_returns_value; |
8305 | p->returns_null = current_function_returns_null; | |
5ce89b2e | 8306 | p->returns_abnormally = current_function_returns_abnormally; |
51e29401 | 8307 | p->warn_about_return_type = warn_about_return_type; |
d2784db4 PB |
8308 | |
8309 | push_function_context (); | |
51e29401 RS |
8310 | } |
8311 | ||
8312 | /* Restore the variables used during compilation of a C function. */ | |
8313 | ||
8314 | void | |
d2784db4 | 8315 | c_pop_function_context (void) |
51e29401 | 8316 | { |
d2784db4 PB |
8317 | struct language_function *p; |
8318 | ||
8319 | pop_function_context (); | |
8320 | p = cfun->language; | |
8321 | cfun->language = NULL; | |
51e29401 | 8322 | |
1da326c3 | 8323 | if (DECL_STRUCT_FUNCTION (current_function_decl) == 0 |
8f17b5c5 | 8324 | && DECL_SAVED_TREE (current_function_decl) == NULL_TREE) |
51e29401 RS |
8325 | { |
8326 | /* Stop pointing to the local nodes about to be freed. */ | |
8327 | /* But DECL_INITIAL must remain nonzero so we know this | |
8328 | was an actual function definition. */ | |
8329 | DECL_INITIAL (current_function_decl) = error_mark_node; | |
8330 | DECL_ARGUMENTS (current_function_decl) = 0; | |
8331 | } | |
8332 | ||
8f17b5c5 | 8333 | c_stmt_tree = p->base.x_stmt_tree; |
506e2710 RH |
8334 | c_break_label = p->x_break_label; |
8335 | c_cont_label = p->x_cont_label; | |
8336 | c_switch_stack = p->x_switch_stack; | |
7b112487 | 8337 | current_function_arg_info = p->arg_info; |
51e29401 RS |
8338 | current_function_returns_value = p->returns_value; |
8339 | current_function_returns_null = p->returns_null; | |
5ce89b2e | 8340 | current_function_returns_abnormally = p->returns_abnormally; |
51e29401 | 8341 | warn_about_return_type = p->warn_about_return_type; |
1526a060 BS |
8342 | } |
8343 | ||
f2c5f623 BC |
8344 | /* The functions below are required for functionality of doing |
8345 | function at once processing in the C front end. Currently these | |
8346 | functions are not called from anywhere in the C front end, but as | |
6645c3fa | 8347 | these changes continue, that will change. */ |
f2c5f623 | 8348 | |
ae499cce MM |
8349 | /* Returns the stmt_tree (if any) to which statements are currently |
8350 | being added. If there is no active statement-tree, NULL is | |
8351 | returned. */ | |
8352 | ||
8353 | stmt_tree | |
35b1a6fa | 8354 | current_stmt_tree (void) |
ae499cce | 8355 | { |
8f17b5c5 MM |
8356 | return &c_stmt_tree; |
8357 | } | |
8358 | ||
339a28b9 | 8359 | /* Return the global value of T as a symbol. */ |
5fd8e536 JM |
8360 | |
8361 | tree | |
35b1a6fa | 8362 | identifier_global_value (tree t) |
5fd8e536 | 8363 | { |
f75fbaf7 | 8364 | struct c_binding *b; |
339a28b9 | 8365 | |
f75fbaf7 | 8366 | for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed) |
9aaabf8a | 8367 | if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b)) |
f75fbaf7 | 8368 | return b->decl; |
339a28b9 | 8369 | |
339a28b9 | 8370 | return 0; |
5fd8e536 | 8371 | } |
eaa7c03f JM |
8372 | |
8373 | /* Record a builtin type for C. If NAME is non-NULL, it is the name used; | |
8374 | otherwise the name is found in ridpointers from RID_INDEX. */ | |
8375 | ||
8376 | void | |
35b1a6fa | 8377 | record_builtin_type (enum rid rid_index, const char *name, tree type) |
eaa7c03f | 8378 | { |
ca043393 | 8379 | tree id, decl; |
eaa7c03f JM |
8380 | if (name == 0) |
8381 | id = ridpointers[(int) rid_index]; | |
8382 | else | |
8383 | id = get_identifier (name); | |
c2255bc4 | 8384 | decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type); |
ca043393 ZW |
8385 | pushdecl (decl); |
8386 | if (debug_hooks->type_decl) | |
8387 | debug_hooks->type_decl (decl, false); | |
eaa7c03f JM |
8388 | } |
8389 | ||
8390 | /* Build the void_list_node (void_type_node having been created). */ | |
8391 | tree | |
35b1a6fa | 8392 | build_void_list_node (void) |
eaa7c03f JM |
8393 | { |
8394 | tree t = build_tree_list (NULL_TREE, void_type_node); | |
8395 | return t; | |
8396 | } | |
81a75f0f | 8397 | |
f8893e47 | 8398 | /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */ |
00325bce | 8399 | |
f8893e47 | 8400 | struct c_parm * |
deb176fa JM |
8401 | build_c_parm (struct c_declspecs *specs, tree attrs, |
8402 | struct c_declarator *declarator) | |
00325bce | 8403 | { |
f8893e47 JM |
8404 | struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm); |
8405 | ret->specs = specs; | |
8406 | ret->attrs = attrs; | |
8407 | ret->declarator = declarator; | |
8408 | return ret; | |
00325bce JM |
8409 | } |
8410 | ||
8411 | /* Return a declarator with nested attributes. TARGET is the inner | |
8412 | declarator to which these attributes apply. ATTRS are the | |
8413 | attributes. */ | |
8414 | ||
f8893e47 JM |
8415 | struct c_declarator * |
8416 | build_attrs_declarator (tree attrs, struct c_declarator *target) | |
00325bce | 8417 | { |
f8893e47 JM |
8418 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); |
8419 | ret->kind = cdk_attrs; | |
8420 | ret->declarator = target; | |
8421 | ret->u.attrs = attrs; | |
8422 | return ret; | |
00325bce JM |
8423 | } |
8424 | ||
8425 | /* Return a declarator for a function with arguments specified by ARGS | |
8426 | and return type specified by TARGET. */ | |
8427 | ||
f8893e47 JM |
8428 | struct c_declarator * |
8429 | build_function_declarator (struct c_arg_info *args, | |
8430 | struct c_declarator *target) | |
00325bce | 8431 | { |
f8893e47 JM |
8432 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); |
8433 | ret->kind = cdk_function; | |
8434 | ret->declarator = target; | |
8435 | ret->u.arg_info = args; | |
8436 | return ret; | |
8437 | } | |
8438 | ||
8439 | /* Return a declarator for the identifier IDENT (which may be | |
8440 | NULL_TREE for an abstract declarator). */ | |
8441 | ||
8442 | struct c_declarator * | |
8443 | build_id_declarator (tree ident) | |
8444 | { | |
8445 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); | |
8446 | ret->kind = cdk_id; | |
8447 | ret->declarator = 0; | |
8448 | ret->u.id = ident; | |
6037d88d PB |
8449 | /* Default value - may get reset to a more precise location. */ |
8450 | ret->id_loc = input_location; | |
f8893e47 | 8451 | return ret; |
00325bce JM |
8452 | } |
8453 | ||
81a75f0f NB |
8454 | /* Return something to represent absolute declarators containing a *. |
8455 | TARGET is the absolute declarator that the * contains. | |
deb176fa JM |
8456 | TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes |
8457 | to apply to the pointer type. */ | |
81a75f0f | 8458 | |
f8893e47 | 8459 | struct c_declarator * |
deb176fa JM |
8460 | make_pointer_declarator (struct c_declspecs *type_quals_attrs, |
8461 | struct c_declarator *target) | |
81a75f0f | 8462 | { |
deb176fa | 8463 | tree attrs; |
3b53cddc | 8464 | int quals = 0; |
f8893e47 JM |
8465 | struct c_declarator *itarget = target; |
8466 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); | |
deb176fa JM |
8467 | if (type_quals_attrs) |
8468 | { | |
8469 | attrs = type_quals_attrs->attrs; | |
3b53cddc | 8470 | quals = quals_from_declspecs (type_quals_attrs); |
deb176fa JM |
8471 | if (attrs != NULL_TREE) |
8472 | itarget = build_attrs_declarator (attrs, target); | |
8473 | } | |
f8893e47 JM |
8474 | ret->kind = cdk_pointer; |
8475 | ret->declarator = itarget; | |
3b53cddc | 8476 | ret->u.pointer_quals = quals; |
deb176fa JM |
8477 | return ret; |
8478 | } | |
8479 | ||
8480 | /* Return a pointer to a structure for an empty list of declaration | |
8481 | specifiers. */ | |
8482 | ||
8483 | struct c_declspecs * | |
8484 | build_null_declspecs (void) | |
8485 | { | |
8486 | struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs); | |
8487 | ret->type = 0; | |
928c19bb | 8488 | ret->expr = 0; |
deb176fa JM |
8489 | ret->decl_attr = 0; |
8490 | ret->attrs = 0; | |
98c3a782 | 8491 | ret->typespec_word = cts_none; |
9a26d6ee | 8492 | ret->storage_class = csc_none; |
928c19bb | 8493 | ret->expr_const_operands = true; |
27bf414c JM |
8494 | ret->declspecs_seen_p = false; |
8495 | ret->type_seen_p = false; | |
deb176fa | 8496 | ret->non_sc_seen_p = false; |
616aeba2 | 8497 | ret->typedef_p = false; |
81da229b | 8498 | ret->tag_defined_p = false; |
98c3a782 | 8499 | ret->explicit_signed_p = false; |
deb176fa | 8500 | ret->deprecated_p = false; |
98c3a782 JM |
8501 | ret->default_int_p = false; |
8502 | ret->long_p = false; | |
deb176fa | 8503 | ret->long_long_p = false; |
98c3a782 JM |
8504 | ret->short_p = false; |
8505 | ret->signed_p = false; | |
8506 | ret->unsigned_p = false; | |
8507 | ret->complex_p = false; | |
9a26d6ee JM |
8508 | ret->inline_p = false; |
8509 | ret->thread_p = false; | |
3b53cddc JM |
8510 | ret->const_p = false; |
8511 | ret->volatile_p = false; | |
8512 | ret->restrict_p = false; | |
ab22c1fa | 8513 | ret->saturating_p = false; |
36c5e70a | 8514 | ret->address_space = ADDR_SPACE_GENERIC; |
f8893e47 | 8515 | return ret; |
81a75f0f | 8516 | } |
e2500fed | 8517 | |
36c5e70a BE |
8518 | /* Add the address space ADDRSPACE to the declaration specifiers |
8519 | SPECS, returning SPECS. */ | |
8520 | ||
8521 | struct c_declspecs * | |
8522 | declspecs_add_addrspace (struct c_declspecs *specs, addr_space_t as) | |
8523 | { | |
8524 | specs->non_sc_seen_p = true; | |
8525 | specs->declspecs_seen_p = true; | |
8526 | ||
8527 | if (!ADDR_SPACE_GENERIC_P (specs->address_space) | |
8528 | && specs->address_space != as) | |
8529 | error ("incompatible address space qualifiers %qs and %qs", | |
8530 | c_addr_space_name (as), | |
8531 | c_addr_space_name (specs->address_space)); | |
8532 | else | |
8533 | specs->address_space = as; | |
8534 | return specs; | |
8535 | } | |
8536 | ||
deb176fa JM |
8537 | /* Add the type qualifier QUAL to the declaration specifiers SPECS, |
8538 | returning SPECS. */ | |
8539 | ||
8540 | struct c_declspecs * | |
8541 | declspecs_add_qual (struct c_declspecs *specs, tree qual) | |
8542 | { | |
8543 | enum rid i; | |
3b53cddc | 8544 | bool dupe = false; |
deb176fa | 8545 | specs->non_sc_seen_p = true; |
27bf414c | 8546 | specs->declspecs_seen_p = true; |
deb176fa JM |
8547 | gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE |
8548 | && C_IS_RESERVED_WORD (qual)); | |
8549 | i = C_RID_CODE (qual); | |
3b53cddc JM |
8550 | switch (i) |
8551 | { | |
8552 | case RID_CONST: | |
8553 | dupe = specs->const_p; | |
8554 | specs->const_p = true; | |
8555 | break; | |
8556 | case RID_VOLATILE: | |
8557 | dupe = specs->volatile_p; | |
8558 | specs->volatile_p = true; | |
8559 | break; | |
8560 | case RID_RESTRICT: | |
8561 | dupe = specs->restrict_p; | |
8562 | specs->restrict_p = true; | |
8563 | break; | |
8564 | default: | |
8565 | gcc_unreachable (); | |
8566 | } | |
fcf73884 | 8567 | if (dupe && !flag_isoc99) |
509c9d60 | 8568 | pedwarn (input_location, OPT_pedantic, "duplicate %qE", qual); |
deb176fa JM |
8569 | return specs; |
8570 | } | |
8571 | ||
8572 | /* Add the type specifier TYPE to the declaration specifiers SPECS, | |
8573 | returning SPECS. */ | |
8574 | ||
8575 | struct c_declspecs * | |
dc491a25 ILT |
8576 | declspecs_add_type (location_t loc, struct c_declspecs *specs, |
8577 | struct c_typespec spec) | |
deb176fa | 8578 | { |
81da229b | 8579 | tree type = spec.spec; |
deb176fa | 8580 | specs->non_sc_seen_p = true; |
27bf414c JM |
8581 | specs->declspecs_seen_p = true; |
8582 | specs->type_seen_p = true; | |
deb176fa JM |
8583 | if (TREE_DEPRECATED (type)) |
8584 | specs->deprecated_p = true; | |
deb176fa | 8585 | |
98c3a782 | 8586 | /* Handle type specifier keywords. */ |
eea1139b ILT |
8587 | if (TREE_CODE (type) == IDENTIFIER_NODE |
8588 | && C_IS_RESERVED_WORD (type) | |
8589 | && C_RID_CODE (type) != RID_CXX_COMPAT_WARN) | |
deb176fa JM |
8590 | { |
8591 | enum rid i = C_RID_CODE (type); | |
98c3a782 JM |
8592 | if (specs->type) |
8593 | { | |
dc491a25 | 8594 | error_at (loc, "two or more data types in declaration specifiers"); |
98c3a782 JM |
8595 | return specs; |
8596 | } | |
deb176fa JM |
8597 | if ((int) i <= (int) RID_LAST_MODIFIER) |
8598 | { | |
ab22c1fa | 8599 | /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */ |
98c3a782 JM |
8600 | bool dupe = false; |
8601 | switch (i) | |
deb176fa | 8602 | { |
98c3a782 | 8603 | case RID_LONG: |
deb176fa | 8604 | if (specs->long_long_p) |
deb176fa | 8605 | { |
dc491a25 | 8606 | error_at (loc, "%<long long long%> is too long for GCC"); |
98c3a782 JM |
8607 | break; |
8608 | } | |
8609 | if (specs->long_p) | |
8610 | { | |
8611 | if (specs->typespec_word == cts_double) | |
8612 | { | |
dc491a25 ILT |
8613 | error_at (loc, |
8614 | ("both %<long long%> and %<double%> in " | |
8615 | "declaration specifiers")); | |
98c3a782 JM |
8616 | break; |
8617 | } | |
dc491a25 | 8618 | pedwarn_c90 (loc, OPT_Wlong_long, |
9c650d90 | 8619 | "ISO C90 does not support %<long long%>"); |
deb176fa | 8620 | specs->long_long_p = 1; |
98c3a782 | 8621 | break; |
deb176fa | 8622 | } |
98c3a782 | 8623 | if (specs->short_p) |
dc491a25 ILT |
8624 | error_at (loc, |
8625 | ("both %<long%> and %<short%> in " | |
8626 | "declaration specifiers")); | |
98c3a782 | 8627 | else if (specs->typespec_word == cts_void) |
dc491a25 ILT |
8628 | error_at (loc, |
8629 | ("both %<long%> and %<void%> in " | |
8630 | "declaration specifiers")); | |
a6766312 KT |
8631 | else if (specs->typespec_word == cts_int128) |
8632 | error_at (loc, | |
8633 | ("both %<long%> and %<__int128%> in " | |
8634 | "declaration specifiers")); | |
98c3a782 | 8635 | else if (specs->typespec_word == cts_bool) |
dc491a25 ILT |
8636 | error_at (loc, |
8637 | ("both %<long%> and %<_Bool%> in " | |
8638 | "declaration specifiers")); | |
98c3a782 | 8639 | else if (specs->typespec_word == cts_char) |
dc491a25 ILT |
8640 | error_at (loc, |
8641 | ("both %<long%> and %<char%> in " | |
8642 | "declaration specifiers")); | |
98c3a782 | 8643 | else if (specs->typespec_word == cts_float) |
dc491a25 ILT |
8644 | error_at (loc, |
8645 | ("both %<long%> and %<float%> in " | |
8646 | "declaration specifiers")); | |
9a8ce21f | 8647 | else if (specs->typespec_word == cts_dfloat32) |
dc491a25 ILT |
8648 | error_at (loc, |
8649 | ("both %<long%> and %<_Decimal32%> in " | |
8650 | "declaration specifiers")); | |
9a8ce21f | 8651 | else if (specs->typespec_word == cts_dfloat64) |
dc491a25 ILT |
8652 | error_at (loc, |
8653 | ("both %<long%> and %<_Decimal64%> in " | |
8654 | "declaration specifiers")); | |
9a8ce21f | 8655 | else if (specs->typespec_word == cts_dfloat128) |
dc491a25 ILT |
8656 | error_at (loc, |
8657 | ("both %<long%> and %<_Decimal128%> in " | |
8658 | "declaration specifiers")); | |
98c3a782 JM |
8659 | else |
8660 | specs->long_p = true; | |
8661 | break; | |
8662 | case RID_SHORT: | |
8663 | dupe = specs->short_p; | |
8664 | if (specs->long_p) | |
dc491a25 ILT |
8665 | error_at (loc, |
8666 | ("both %<long%> and %<short%> in " | |
8667 | "declaration specifiers")); | |
98c3a782 | 8668 | else if (specs->typespec_word == cts_void) |
dc491a25 ILT |
8669 | error_at (loc, |
8670 | ("both %<short%> and %<void%> in " | |
8671 | "declaration specifiers")); | |
a6766312 KT |
8672 | else if (specs->typespec_word == cts_int128) |
8673 | error_at (loc, | |
8674 | ("both %<short%> and %<__int128%> in " | |
8675 | "declaration specifiers")); | |
98c3a782 | 8676 | else if (specs->typespec_word == cts_bool) |
dc491a25 ILT |
8677 | error_at (loc, |
8678 | ("both %<short%> and %<_Bool%> in " | |
8679 | "declaration specifiers")); | |
98c3a782 | 8680 | else if (specs->typespec_word == cts_char) |
dc491a25 ILT |
8681 | error_at (loc, |
8682 | ("both %<short%> and %<char%> in " | |
8683 | "declaration specifiers")); | |
98c3a782 | 8684 | else if (specs->typespec_word == cts_float) |
dc491a25 ILT |
8685 | error_at (loc, |
8686 | ("both %<short%> and %<float%> in " | |
8687 | "declaration specifiers")); | |
98c3a782 | 8688 | else if (specs->typespec_word == cts_double) |
dc491a25 ILT |
8689 | error_at (loc, |
8690 | ("both %<short%> and %<double%> in " | |
8691 | "declaration specifiers")); | |
9a8ce21f | 8692 | else if (specs->typespec_word == cts_dfloat32) |
dc491a25 ILT |
8693 | error_at (loc, |
8694 | ("both %<short%> and %<_Decimal32%> in " | |
8695 | "declaration specifiers")); | |
9a8ce21f | 8696 | else if (specs->typespec_word == cts_dfloat64) |
dc491a25 ILT |
8697 | error_at (loc, |
8698 | ("both %<short%> and %<_Decimal64%> in " | |
8699 | "declaration specifiers")); | |
9a8ce21f | 8700 | else if (specs->typespec_word == cts_dfloat128) |
dc491a25 ILT |
8701 | error_at (loc, |
8702 | ("both %<short%> and %<_Decimal128%> in " | |
8703 | "declaration specifiers")); | |
98c3a782 JM |
8704 | else |
8705 | specs->short_p = true; | |
8706 | break; | |
8707 | case RID_SIGNED: | |
8708 | dupe = specs->signed_p; | |
8709 | if (specs->unsigned_p) | |
dc491a25 ILT |
8710 | error_at (loc, |
8711 | ("both %<signed%> and %<unsigned%> in " | |
8712 | "declaration specifiers")); | |
98c3a782 | 8713 | else if (specs->typespec_word == cts_void) |
dc491a25 ILT |
8714 | error_at (loc, |
8715 | ("both %<signed%> and %<void%> in " | |
8716 | "declaration specifiers")); | |
98c3a782 | 8717 | else if (specs->typespec_word == cts_bool) |
dc491a25 ILT |
8718 | error_at (loc, |
8719 | ("both %<signed%> and %<_Bool%> in " | |
8720 | "declaration specifiers")); | |
98c3a782 | 8721 | else if (specs->typespec_word == cts_float) |
dc491a25 ILT |
8722 | error_at (loc, |
8723 | ("both %<signed%> and %<float%> in " | |
8724 | "declaration specifiers")); | |
98c3a782 | 8725 | else if (specs->typespec_word == cts_double) |
dc491a25 ILT |
8726 | error_at (loc, |
8727 | ("both %<signed%> and %<double%> in " | |
8728 | "declaration specifiers")); | |
9a8ce21f | 8729 | else if (specs->typespec_word == cts_dfloat32) |
dc491a25 ILT |
8730 | error_at (loc, |
8731 | ("both %<signed%> and %<_Decimal32%> in " | |
8732 | "declaration specifiers")); | |
9a8ce21f | 8733 | else if (specs->typespec_word == cts_dfloat64) |
dc491a25 ILT |
8734 | error_at (loc, |
8735 | ("both %<signed%> and %<_Decimal64%> in " | |
8736 | "declaration specifiers")); | |
9a8ce21f | 8737 | else if (specs->typespec_word == cts_dfloat128) |
dc491a25 ILT |
8738 | error_at (loc, |
8739 | ("both %<signed%> and %<_Decimal128%> in " | |
8740 | "declaration specifiers")); | |
98c3a782 JM |
8741 | else |
8742 | specs->signed_p = true; | |
8743 | break; | |
8744 | case RID_UNSIGNED: | |
8745 | dupe = specs->unsigned_p; | |
8746 | if (specs->signed_p) | |
dc491a25 ILT |
8747 | error_at (loc, |
8748 | ("both %<signed%> and %<unsigned%> in " | |
8749 | "declaration specifiers")); | |
98c3a782 | 8750 | else if (specs->typespec_word == cts_void) |
dc491a25 ILT |
8751 | error_at (loc, |
8752 | ("both %<unsigned%> and %<void%> in " | |
8753 | "declaration specifiers")); | |
98c3a782 | 8754 | else if (specs->typespec_word == cts_bool) |
dc491a25 ILT |
8755 | error_at (loc, |
8756 | ("both %<unsigned%> and %<_Bool%> in " | |
8757 | "declaration specifiers")); | |
98c3a782 | 8758 | else if (specs->typespec_word == cts_float) |
dc491a25 ILT |
8759 | error_at (loc, |
8760 | ("both %<unsigned%> and %<float%> in " | |
8761 | "declaration specifiers")); | |
98c3a782 | 8762 | else if (specs->typespec_word == cts_double) |
dc491a25 ILT |
8763 | error_at (loc, |
8764 | ("both %<unsigned%> and %<double%> in " | |
8765 | "declaration specifiers")); | |
9a8ce21f | 8766 | else if (specs->typespec_word == cts_dfloat32) |
dc491a25 ILT |
8767 | error_at (loc, |
8768 | ("both %<unsigned%> and %<_Decimal32%> in " | |
8769 | "declaration specifiers")); | |
9a8ce21f | 8770 | else if (specs->typespec_word == cts_dfloat64) |
dc491a25 ILT |
8771 | error_at (loc, |
8772 | ("both %<unsigned%> and %<_Decimal64%> in " | |
8773 | "declaration specifiers")); | |
9a8ce21f | 8774 | else if (specs->typespec_word == cts_dfloat128) |
dc491a25 ILT |
8775 | error_at (loc, |
8776 | ("both %<unsigned%> and %<_Decimal128%> in " | |
8777 | "declaration specifiers")); | |
98c3a782 JM |
8778 | else |
8779 | specs->unsigned_p = true; | |
8780 | break; | |
8781 | case RID_COMPLEX: | |
8782 | dupe = specs->complex_p; | |
fcf73884 | 8783 | if (!flag_isoc99 && !in_system_header) |
dc491a25 ILT |
8784 | pedwarn (loc, OPT_pedantic, |
8785 | "ISO C90 does not support complex types"); | |
98c3a782 | 8786 | if (specs->typespec_word == cts_void) |
dc491a25 ILT |
8787 | error_at (loc, |
8788 | ("both %<complex%> and %<void%> in " | |
8789 | "declaration specifiers")); | |
98c3a782 | 8790 | else if (specs->typespec_word == cts_bool) |
dc491a25 ILT |
8791 | error_at (loc, |
8792 | ("both %<complex%> and %<_Bool%> in " | |
8793 | "declaration specifiers")); | |
9a8ce21f | 8794 | else if (specs->typespec_word == cts_dfloat32) |
dc491a25 ILT |
8795 | error_at (loc, |
8796 | ("both %<complex%> and %<_Decimal32%> in " | |
8797 | "declaration specifiers")); | |
9a8ce21f | 8798 | else if (specs->typespec_word == cts_dfloat64) |
dc491a25 ILT |
8799 | error_at (loc, |
8800 | ("both %<complex%> and %<_Decimal64%> in " | |
8801 | "declaration specifiers")); | |
9a8ce21f | 8802 | else if (specs->typespec_word == cts_dfloat128) |
dc491a25 ILT |
8803 | error_at (loc, |
8804 | ("both %<complex%> and %<_Decimal128%> in " | |
8805 | "declaration specifiers")); | |
ab22c1fa | 8806 | else if (specs->typespec_word == cts_fract) |
dc491a25 ILT |
8807 | error_at (loc, |
8808 | ("both %<complex%> and %<_Fract%> in " | |
8809 | "declaration specifiers")); | |
ab22c1fa | 8810 | else if (specs->typespec_word == cts_accum) |
dc491a25 ILT |
8811 | error_at (loc, |
8812 | ("both %<complex%> and %<_Accum%> in " | |
8813 | "declaration specifiers")); | |
ab22c1fa | 8814 | else if (specs->saturating_p) |
dc491a25 ILT |
8815 | error_at (loc, |
8816 | ("both %<complex%> and %<_Sat%> in " | |
8817 | "declaration specifiers")); | |
98c3a782 JM |
8818 | else |
8819 | specs->complex_p = true; | |
8820 | break; | |
ab22c1fa CF |
8821 | case RID_SAT: |
8822 | dupe = specs->saturating_p; | |
dc491a25 ILT |
8823 | pedwarn (loc, OPT_pedantic, |
8824 | "ISO C does not support saturating types"); | |
a6766312 KT |
8825 | if (specs->typespec_word == cts_int128) |
8826 | { | |
8827 | error_at (loc, | |
8828 | ("both %<_Sat%> and %<__int128%> in " | |
8829 | "declaration specifiers")); | |
8830 | } | |
8831 | else if (specs->typespec_word == cts_void) | |
dc491a25 ILT |
8832 | error_at (loc, |
8833 | ("both %<_Sat%> and %<void%> in " | |
8834 | "declaration specifiers")); | |
ab22c1fa | 8835 | else if (specs->typespec_word == cts_bool) |
dc491a25 ILT |
8836 | error_at (loc, |
8837 | ("both %<_Sat%> and %<_Bool%> in " | |
8838 | "declaration specifiers")); | |
ab22c1fa | 8839 | else if (specs->typespec_word == cts_char) |
dc491a25 ILT |
8840 | error_at (loc, |
8841 | ("both %<_Sat%> and %<char%> in " | |
8842 | "declaration specifiers")); | |
ab22c1fa | 8843 | else if (specs->typespec_word == cts_int) |
dc491a25 ILT |
8844 | error_at (loc, |
8845 | ("both %<_Sat%> and %<int%> in " | |
8846 | "declaration specifiers")); | |
ab22c1fa | 8847 | else if (specs->typespec_word == cts_float) |
dc491a25 ILT |
8848 | error_at (loc, |
8849 | ("both %<_Sat%> and %<float%> in " | |
8850 | "declaration specifiers")); | |
ab22c1fa | 8851 | else if (specs->typespec_word == cts_double) |
dc491a25 ILT |
8852 | error_at (loc, |
8853 | ("both %<_Sat%> and %<double%> in " | |
8854 | "declaration specifiers")); | |
ab22c1fa | 8855 | else if (specs->typespec_word == cts_dfloat32) |
dc491a25 ILT |
8856 | error_at (loc, |
8857 | ("both %<_Sat%> and %<_Decimal32%> in " | |
8858 | "declaration specifiers")); | |
ab22c1fa | 8859 | else if (specs->typespec_word == cts_dfloat64) |
dc491a25 ILT |
8860 | error_at (loc, |
8861 | ("both %<_Sat%> and %<_Decimal64%> in " | |
8862 | "declaration specifiers")); | |
ab22c1fa | 8863 | else if (specs->typespec_word == cts_dfloat128) |
dc491a25 ILT |
8864 | error_at (loc, |
8865 | ("both %<_Sat%> and %<_Decimal128%> in " | |
8866 | "declaration specifiers")); | |
ab22c1fa | 8867 | else if (specs->complex_p) |
dc491a25 ILT |
8868 | error_at (loc, |
8869 | ("both %<_Sat%> and %<complex%> in " | |
8870 | "declaration specifiers")); | |
ab22c1fa CF |
8871 | else |
8872 | specs->saturating_p = true; | |
8873 | break; | |
98c3a782 JM |
8874 | default: |
8875 | gcc_unreachable (); | |
deb176fa | 8876 | } |
98c3a782 JM |
8877 | |
8878 | if (dupe) | |
dc491a25 | 8879 | error_at (loc, "duplicate %qE", type); |
deb176fa | 8880 | |
deb176fa JM |
8881 | return specs; |
8882 | } | |
98c3a782 JM |
8883 | else |
8884 | { | |
ab22c1fa | 8885 | /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32", |
a6766312 | 8886 | "__int128", "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */ |
98c3a782 JM |
8887 | if (specs->typespec_word != cts_none) |
8888 | { | |
dc491a25 ILT |
8889 | error_at (loc, |
8890 | "two or more data types in declaration specifiers"); | |
98c3a782 JM |
8891 | return specs; |
8892 | } | |
8893 | switch (i) | |
8894 | { | |
a6766312 KT |
8895 | case RID_INT128: |
8896 | if (int128_integer_type_node == NULL_TREE) | |
8897 | { | |
8898 | error_at (loc, "%<__int128%> is not supported for this target"); | |
8899 | return specs; | |
8900 | } | |
8901 | if (!in_system_header) | |
8902 | pedwarn (loc, OPT_pedantic, | |
8903 | "ISO C does not support %<__int128%> type"); | |
8904 | ||
8905 | if (specs->long_p) | |
8906 | error_at (loc, | |
8907 | ("both %<__int128%> and %<long%> in " | |
8908 | "declaration specifiers")); | |
8909 | else if (specs->saturating_p) | |
8910 | error_at (loc, | |
8911 | ("both %<_Sat%> and %<__int128%> in " | |
8912 | "declaration specifiers")); | |
8913 | else if (specs->short_p) | |
8914 | error_at (loc, | |
8915 | ("both %<__int128%> and %<short%> in " | |
8916 | "declaration specifiers")); | |
8917 | else | |
8918 | specs->typespec_word = cts_int128; | |
8919 | return specs; | |
98c3a782 JM |
8920 | case RID_VOID: |
8921 | if (specs->long_p) | |
dc491a25 ILT |
8922 | error_at (loc, |
8923 | ("both %<long%> and %<void%> in " | |
8924 | "declaration specifiers")); | |
98c3a782 | 8925 | else if (specs->short_p) |
dc491a25 ILT |
8926 | error_at (loc, |
8927 | ("both %<short%> and %<void%> in " | |
8928 | "declaration specifiers")); | |
98c3a782 | 8929 | else if (specs->signed_p) |
dc491a25 ILT |
8930 | error_at (loc, |
8931 | ("both %<signed%> and %<void%> in " | |
8932 | "declaration specifiers")); | |
98c3a782 | 8933 | else if (specs->unsigned_p) |
dc491a25 ILT |
8934 | error_at (loc, |
8935 | ("both %<unsigned%> and %<void%> in " | |
8936 | "declaration specifiers")); | |
98c3a782 | 8937 | else if (specs->complex_p) |
dc491a25 ILT |
8938 | error_at (loc, |
8939 | ("both %<complex%> and %<void%> in " | |
8940 | "declaration specifiers")); | |
ab22c1fa | 8941 | else if (specs->saturating_p) |
dc491a25 ILT |
8942 | error_at (loc, |
8943 | ("both %<_Sat%> and %<void%> in " | |
8944 | "declaration specifiers")); | |
98c3a782 JM |
8945 | else |
8946 | specs->typespec_word = cts_void; | |
8947 | return specs; | |
8948 | case RID_BOOL: | |
8949 | if (specs->long_p) | |
dc491a25 ILT |
8950 | error_at (loc, |
8951 | ("both %<long%> and %<_Bool%> in " | |
8952 | "declaration specifiers")); | |
98c3a782 | 8953 | else if (specs->short_p) |
dc491a25 ILT |
8954 | error_at (loc, |
8955 | ("both %<short%> and %<_Bool%> in " | |
8956 | "declaration specifiers")); | |
98c3a782 | 8957 | else if (specs->signed_p) |
dc491a25 ILT |
8958 | error_at (loc, |
8959 | ("both %<signed%> and %<_Bool%> in " | |
8960 | "declaration specifiers")); | |
98c3a782 | 8961 | else if (specs->unsigned_p) |
dc491a25 ILT |
8962 | error_at (loc, |
8963 | ("both %<unsigned%> and %<_Bool%> in " | |
8964 | "declaration specifiers")); | |
98c3a782 | 8965 | else if (specs->complex_p) |
dc491a25 ILT |
8966 | error_at (loc, |
8967 | ("both %<complex%> and %<_Bool%> in " | |
8968 | "declaration specifiers")); | |
ab22c1fa | 8969 | else if (specs->saturating_p) |
dc491a25 ILT |
8970 | error_at (loc, |
8971 | ("both %<_Sat%> and %<_Bool%> in " | |
8972 | "declaration specifiers")); | |
98c3a782 JM |
8973 | else |
8974 | specs->typespec_word = cts_bool; | |
8975 | return specs; | |
8976 | case RID_CHAR: | |
8977 | if (specs->long_p) | |
dc491a25 ILT |
8978 | error_at (loc, |
8979 | ("both %<long%> and %<char%> in " | |
8980 | "declaration specifiers")); | |
98c3a782 | 8981 | else if (specs->short_p) |
dc491a25 ILT |
8982 | error_at (loc, |
8983 | ("both %<short%> and %<char%> in " | |
8984 | "declaration specifiers")); | |
ab22c1fa | 8985 | else if (specs->saturating_p) |
dc491a25 ILT |
8986 | error_at (loc, |
8987 | ("both %<_Sat%> and %<char%> in " | |
8988 | "declaration specifiers")); | |
98c3a782 JM |
8989 | else |
8990 | specs->typespec_word = cts_char; | |
8991 | return specs; | |
8992 | case RID_INT: | |
ab22c1fa | 8993 | if (specs->saturating_p) |
dc491a25 ILT |
8994 | error_at (loc, |
8995 | ("both %<_Sat%> and %<int%> in " | |
8996 | "declaration specifiers")); | |
ab22c1fa CF |
8997 | else |
8998 | specs->typespec_word = cts_int; | |
98c3a782 JM |
8999 | return specs; |
9000 | case RID_FLOAT: | |
9001 | if (specs->long_p) | |
dc491a25 ILT |
9002 | error_at (loc, |
9003 | ("both %<long%> and %<float%> in " | |
9004 | "declaration specifiers")); | |
98c3a782 | 9005 | else if (specs->short_p) |
dc491a25 ILT |
9006 | error_at (loc, |
9007 | ("both %<short%> and %<float%> in " | |
9008 | "declaration specifiers")); | |
98c3a782 | 9009 | else if (specs->signed_p) |
dc491a25 ILT |
9010 | error_at (loc, |
9011 | ("both %<signed%> and %<float%> in " | |
9012 | "declaration specifiers")); | |
98c3a782 | 9013 | else if (specs->unsigned_p) |
dc491a25 ILT |
9014 | error_at (loc, |
9015 | ("both %<unsigned%> and %<float%> in " | |
9016 | "declaration specifiers")); | |
ab22c1fa | 9017 | else if (specs->saturating_p) |
dc491a25 ILT |
9018 | error_at (loc, |
9019 | ("both %<_Sat%> and %<float%> in " | |
9020 | "declaration specifiers")); | |
98c3a782 JM |
9021 | else |
9022 | specs->typespec_word = cts_float; | |
9023 | return specs; | |
9024 | case RID_DOUBLE: | |
9025 | if (specs->long_long_p) | |
dc491a25 ILT |
9026 | error_at (loc, |
9027 | ("both %<long long%> and %<double%> in " | |
9028 | "declaration specifiers")); | |
98c3a782 | 9029 | else if (specs->short_p) |
dc491a25 ILT |
9030 | error_at (loc, |
9031 | ("both %<short%> and %<double%> in " | |
9032 | "declaration specifiers")); | |
98c3a782 | 9033 | else if (specs->signed_p) |
dc491a25 ILT |
9034 | error_at (loc, |
9035 | ("both %<signed%> and %<double%> in " | |
9036 | "declaration specifiers")); | |
98c3a782 | 9037 | else if (specs->unsigned_p) |
dc491a25 ILT |
9038 | error_at (loc, |
9039 | ("both %<unsigned%> and %<double%> in " | |
9040 | "declaration specifiers")); | |
ab22c1fa | 9041 | else if (specs->saturating_p) |
dc491a25 ILT |
9042 | error_at (loc, |
9043 | ("both %<_Sat%> and %<double%> in " | |
9044 | "declaration specifiers")); | |
98c3a782 JM |
9045 | else |
9046 | specs->typespec_word = cts_double; | |
9047 | return specs; | |
9a8ce21f JG |
9048 | case RID_DFLOAT32: |
9049 | case RID_DFLOAT64: | |
9050 | case RID_DFLOAT128: | |
b8698a0f | 9051 | { |
9a8ce21f JG |
9052 | const char *str; |
9053 | if (i == RID_DFLOAT32) | |
9054 | str = "_Decimal32"; | |
9055 | else if (i == RID_DFLOAT64) | |
9056 | str = "_Decimal64"; | |
9057 | else | |
9058 | str = "_Decimal128"; | |
9059 | if (specs->long_long_p) | |
dc491a25 ILT |
9060 | error_at (loc, |
9061 | ("both %<long long%> and %<%s%> in " | |
9062 | "declaration specifiers"), | |
9063 | str); | |
9a8ce21f | 9064 | if (specs->long_p) |
dc491a25 ILT |
9065 | error_at (loc, |
9066 | ("both %<long%> and %<%s%> in " | |
9067 | "declaration specifiers"), | |
9068 | str); | |
9a8ce21f | 9069 | else if (specs->short_p) |
dc491a25 ILT |
9070 | error_at (loc, |
9071 | ("both %<short%> and %<%s%> in " | |
9072 | "declaration specifiers"), | |
9073 | str); | |
9a8ce21f | 9074 | else if (specs->signed_p) |
dc491a25 ILT |
9075 | error_at (loc, |
9076 | ("both %<signed%> and %<%s%> in " | |
9077 | "declaration specifiers"), | |
9078 | str); | |
9a8ce21f | 9079 | else if (specs->unsigned_p) |
dc491a25 ILT |
9080 | error_at (loc, |
9081 | ("both %<unsigned%> and %<%s%> in " | |
9082 | "declaration specifiers"), | |
9083 | str); | |
9a8ce21f | 9084 | else if (specs->complex_p) |
dc491a25 ILT |
9085 | error_at (loc, |
9086 | ("both %<complex%> and %<%s%> in " | |
9087 | "declaration specifiers"), | |
9088 | str); | |
ab22c1fa | 9089 | else if (specs->saturating_p) |
dc491a25 ILT |
9090 | error_at (loc, |
9091 | ("both %<_Sat%> and %<%s%> in " | |
9092 | "declaration specifiers"), | |
9093 | str); | |
9a8ce21f JG |
9094 | else if (i == RID_DFLOAT32) |
9095 | specs->typespec_word = cts_dfloat32; | |
9096 | else if (i == RID_DFLOAT64) | |
9097 | specs->typespec_word = cts_dfloat64; | |
9098 | else | |
9099 | specs->typespec_word = cts_dfloat128; | |
9100 | } | |
9101 | if (!targetm.decimal_float_supported_p ()) | |
dc491a25 ILT |
9102 | error_at (loc, |
9103 | ("decimal floating point not supported " | |
9104 | "for this target")); | |
9105 | pedwarn (loc, OPT_pedantic, | |
fcf73884 | 9106 | "ISO C does not support decimal floating point"); |
9a8ce21f | 9107 | return specs; |
ab22c1fa CF |
9108 | case RID_FRACT: |
9109 | case RID_ACCUM: | |
9110 | { | |
9111 | const char *str; | |
9112 | if (i == RID_FRACT) | |
9113 | str = "_Fract"; | |
9114 | else | |
9115 | str = "_Accum"; | |
9116 | if (specs->complex_p) | |
dc491a25 ILT |
9117 | error_at (loc, |
9118 | ("both %<complex%> and %<%s%> in " | |
9119 | "declaration specifiers"), | |
9120 | str); | |
ab22c1fa CF |
9121 | else if (i == RID_FRACT) |
9122 | specs->typespec_word = cts_fract; | |
9123 | else | |
9124 | specs->typespec_word = cts_accum; | |
9125 | } | |
9126 | if (!targetm.fixed_point_supported_p ()) | |
dc491a25 ILT |
9127 | error_at (loc, |
9128 | "fixed-point types not supported for this target"); | |
9129 | pedwarn (loc, OPT_pedantic, | |
fcf73884 | 9130 | "ISO C does not support fixed-point types"); |
ab22c1fa | 9131 | return specs; |
98c3a782 JM |
9132 | default: |
9133 | /* ObjC reserved word "id", handled below. */ | |
9134 | break; | |
9135 | } | |
9136 | } | |
deb176fa | 9137 | } |
98c3a782 JM |
9138 | |
9139 | /* Now we have a typedef (a TYPE_DECL node), an identifier (some | |
9140 | form of ObjC type, cases such as "int" and "long" being handled | |
9141 | above), a TYPE (struct, union, enum and typeof specifiers) or an | |
9142 | ERROR_MARK. In none of these cases may there have previously | |
9143 | been any type specifiers. */ | |
9144 | if (specs->type || specs->typespec_word != cts_none | |
9145 | || specs->long_p || specs->short_p || specs->signed_p | |
9146 | || specs->unsigned_p || specs->complex_p) | |
dc491a25 | 9147 | error_at (loc, "two or more data types in declaration specifiers"); |
deb176fa JM |
9148 | else if (TREE_CODE (type) == TYPE_DECL) |
9149 | { | |
9150 | if (TREE_TYPE (type) == error_mark_node) | |
9151 | ; /* Allow the type to default to int to avoid cascading errors. */ | |
9152 | else | |
9153 | { | |
9154 | specs->type = TREE_TYPE (type); | |
9155 | specs->decl_attr = DECL_ATTRIBUTES (type); | |
616aeba2 | 9156 | specs->typedef_p = true; |
98c3a782 | 9157 | specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type); |
dc491a25 ILT |
9158 | |
9159 | /* If this typedef name is defined in a struct, then a C++ | |
9160 | lookup would return a different value. */ | |
9161 | if (warn_cxx_compat | |
9162 | && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct) | |
9163 | warning_at (loc, OPT_Wc___compat, | |
9164 | "C++ lookup of %qD would return a field, not a type", | |
9165 | type); | |
9166 | ||
9167 | /* If we are parsing a struct, record that a struct field | |
9168 | used a typedef. */ | |
9169 | if (warn_cxx_compat && struct_parse_info != NULL) | |
9170 | VEC_safe_push (tree, heap, struct_parse_info->typedefs_seen, type); | |
deb176fa JM |
9171 | } |
9172 | } | |
deb176fa JM |
9173 | else if (TREE_CODE (type) == IDENTIFIER_NODE) |
9174 | { | |
9175 | tree t = lookup_name (type); | |
9176 | if (!t || TREE_CODE (t) != TYPE_DECL) | |
dc491a25 | 9177 | error_at (loc, "%qE fails to be a typedef or built in type", type); |
deb176fa JM |
9178 | else if (TREE_TYPE (t) == error_mark_node) |
9179 | ; | |
9180 | else | |
9181 | specs->type = TREE_TYPE (t); | |
9182 | } | |
9183 | else if (TREE_CODE (type) != ERROR_MARK) | |
81da229b JM |
9184 | { |
9185 | if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref) | |
9186 | specs->tag_defined_p = true; | |
9187 | if (spec.kind == ctsk_typeof) | |
928c19bb JM |
9188 | { |
9189 | specs->typedef_p = true; | |
9190 | if (spec.expr) | |
9191 | { | |
9192 | if (specs->expr) | |
9193 | specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr), | |
9194 | specs->expr, spec.expr); | |
9195 | else | |
9196 | specs->expr = spec.expr; | |
9197 | specs->expr_const_operands &= spec.expr_const_operands; | |
9198 | } | |
9199 | } | |
81da229b JM |
9200 | specs->type = type; |
9201 | } | |
deb176fa JM |
9202 | |
9203 | return specs; | |
9204 | } | |
9205 | ||
9206 | /* Add the storage class specifier or function specifier SCSPEC to the | |
9207 | declaration specifiers SPECS, returning SPECS. */ | |
9208 | ||
9209 | struct c_declspecs * | |
9210 | declspecs_add_scspec (struct c_declspecs *specs, tree scspec) | |
9211 | { | |
9212 | enum rid i; | |
9a26d6ee JM |
9213 | enum c_storage_class n = csc_none; |
9214 | bool dupe = false; | |
27bf414c | 9215 | specs->declspecs_seen_p = true; |
deb176fa JM |
9216 | gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE |
9217 | && C_IS_RESERVED_WORD (scspec)); | |
9218 | i = C_RID_CODE (scspec); | |
b1ed4cb4 | 9219 | if (specs->non_sc_seen_p) |
b8698a0f | 9220 | warning (OPT_Wold_style_declaration, |
b1ed4cb4 | 9221 | "%qE is not at beginning of declaration", scspec); |
9a26d6ee JM |
9222 | switch (i) |
9223 | { | |
9224 | case RID_INLINE: | |
61f4f1cc JM |
9225 | /* C99 permits duplicate inline. Although of doubtful utility, |
9226 | it seems simplest to permit it in gnu89 mode as well, as | |
9227 | there is also little utility in maintaining this as a | |
9228 | difference between gnu89 and C99 inline. */ | |
9229 | dupe = false; | |
9a26d6ee JM |
9230 | specs->inline_p = true; |
9231 | break; | |
9232 | case RID_THREAD: | |
9233 | dupe = specs->thread_p; | |
9234 | if (specs->storage_class == csc_auto) | |
9235 | error ("%<__thread%> used with %<auto%>"); | |
9236 | else if (specs->storage_class == csc_register) | |
9237 | error ("%<__thread%> used with %<register%>"); | |
9238 | else if (specs->storage_class == csc_typedef) | |
9239 | error ("%<__thread%> used with %<typedef%>"); | |
9240 | else | |
9241 | specs->thread_p = true; | |
9242 | break; | |
9243 | case RID_AUTO: | |
9244 | n = csc_auto; | |
9245 | break; | |
9246 | case RID_EXTERN: | |
9247 | n = csc_extern; | |
9248 | /* Diagnose "__thread extern". */ | |
9249 | if (specs->thread_p) | |
deb176fa | 9250 | error ("%<__thread%> before %<extern%>"); |
9a26d6ee JM |
9251 | break; |
9252 | case RID_REGISTER: | |
9253 | n = csc_register; | |
9254 | break; | |
9255 | case RID_STATIC: | |
9256 | n = csc_static; | |
9257 | /* Diagnose "__thread static". */ | |
9258 | if (specs->thread_p) | |
deb176fa | 9259 | error ("%<__thread%> before %<static%>"); |
9a26d6ee JM |
9260 | break; |
9261 | case RID_TYPEDEF: | |
9262 | n = csc_typedef; | |
9263 | break; | |
9264 | default: | |
9265 | gcc_unreachable (); | |
9266 | } | |
9267 | if (n != csc_none && n == specs->storage_class) | |
9268 | dupe = true; | |
9269 | if (dupe) | |
c51a1ba9 | 9270 | error ("duplicate %qE", scspec); |
9a26d6ee JM |
9271 | if (n != csc_none) |
9272 | { | |
9273 | if (specs->storage_class != csc_none && n != specs->storage_class) | |
9274 | { | |
9275 | error ("multiple storage classes in declaration specifiers"); | |
9276 | } | |
9277 | else | |
9278 | { | |
9279 | specs->storage_class = n; | |
9280 | if (n != csc_extern && n != csc_static && specs->thread_p) | |
9281 | { | |
c51a1ba9 | 9282 | error ("%<__thread%> used with %qE", scspec); |
9a26d6ee JM |
9283 | specs->thread_p = false; |
9284 | } | |
9285 | } | |
deb176fa | 9286 | } |
deb176fa JM |
9287 | return specs; |
9288 | } | |
9289 | ||
9290 | /* Add the attributes ATTRS to the declaration specifiers SPECS, | |
9291 | returning SPECS. */ | |
9292 | ||
9293 | struct c_declspecs * | |
9294 | declspecs_add_attrs (struct c_declspecs *specs, tree attrs) | |
9295 | { | |
9296 | specs->attrs = chainon (attrs, specs->attrs); | |
27bf414c | 9297 | specs->declspecs_seen_p = true; |
deb176fa JM |
9298 | return specs; |
9299 | } | |
9300 | ||
98c3a782 JM |
9301 | /* Combine "long", "short", "signed", "unsigned" and "_Complex" type |
9302 | specifiers with any other type specifier to determine the resulting | |
9303 | type. This is where ISO C checks on complex types are made, since | |
9304 | "_Complex long" is a prefix of the valid ISO C type "_Complex long | |
9305 | double". */ | |
9306 | ||
9307 | struct c_declspecs * | |
9308 | finish_declspecs (struct c_declspecs *specs) | |
9309 | { | |
9310 | /* If a type was specified as a whole, we have no modifiers and are | |
9311 | done. */ | |
9312 | if (specs->type != NULL_TREE) | |
9313 | { | |
9314 | gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p | |
9315 | && !specs->signed_p && !specs->unsigned_p | |
9316 | && !specs->complex_p); | |
9317 | return specs; | |
9318 | } | |
9319 | ||
9320 | /* If none of "void", "_Bool", "char", "int", "float" or "double" | |
9321 | has been specified, treat it as "int" unless "_Complex" is | |
9322 | present and there are no other specifiers. If we just have | |
9323 | "_Complex", it is equivalent to "_Complex double", but e.g. | |
9324 | "_Complex short" is equivalent to "_Complex short int". */ | |
9325 | if (specs->typespec_word == cts_none) | |
9326 | { | |
ab22c1fa | 9327 | if (specs->saturating_p) |
819fec00 NS |
9328 | { |
9329 | error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>"); | |
754ccf7c JJ |
9330 | if (!targetm.fixed_point_supported_p ()) |
9331 | error ("fixed-point types not supported for this target"); | |
819fec00 NS |
9332 | specs->typespec_word = cts_fract; |
9333 | } | |
9334 | else if (specs->long_p || specs->short_p | |
9335 | || specs->signed_p || specs->unsigned_p) | |
98c3a782 JM |
9336 | { |
9337 | specs->typespec_word = cts_int; | |
9338 | } | |
9339 | else if (specs->complex_p) | |
9340 | { | |
9341 | specs->typespec_word = cts_double; | |
b8698a0f | 9342 | pedwarn (input_location, OPT_pedantic, |
fcf73884 MLI |
9343 | "ISO C does not support plain %<complex%> meaning " |
9344 | "%<double complex%>"); | |
98c3a782 JM |
9345 | } |
9346 | else | |
9347 | { | |
9348 | specs->typespec_word = cts_int; | |
9349 | specs->default_int_p = true; | |
9350 | /* We don't diagnose this here because grokdeclarator will | |
9351 | give more specific diagnostics according to whether it is | |
9352 | a function definition. */ | |
9353 | } | |
9354 | } | |
9355 | ||
9356 | /* If "signed" was specified, record this to distinguish "int" and | |
9357 | "signed int" in the case of a bit-field with | |
9358 | -funsigned-bitfields. */ | |
9359 | specs->explicit_signed_p = specs->signed_p; | |
9360 | ||
9361 | /* Now compute the actual type. */ | |
9362 | switch (specs->typespec_word) | |
9363 | { | |
9364 | case cts_void: | |
9365 | gcc_assert (!specs->long_p && !specs->short_p | |
9366 | && !specs->signed_p && !specs->unsigned_p | |
9367 | && !specs->complex_p); | |
9368 | specs->type = void_type_node; | |
9369 | break; | |
9370 | case cts_bool: | |
9371 | gcc_assert (!specs->long_p && !specs->short_p | |
9372 | && !specs->signed_p && !specs->unsigned_p | |
9373 | && !specs->complex_p); | |
9374 | specs->type = boolean_type_node; | |
9375 | break; | |
9376 | case cts_char: | |
9377 | gcc_assert (!specs->long_p && !specs->short_p); | |
9378 | gcc_assert (!(specs->signed_p && specs->unsigned_p)); | |
9379 | if (specs->signed_p) | |
9380 | specs->type = signed_char_type_node; | |
9381 | else if (specs->unsigned_p) | |
9382 | specs->type = unsigned_char_type_node; | |
9383 | else | |
9384 | specs->type = char_type_node; | |
9385 | if (specs->complex_p) | |
9386 | { | |
b8698a0f | 9387 | pedwarn (input_location, OPT_pedantic, |
fcf73884 | 9388 | "ISO C does not support complex integer types"); |
98c3a782 JM |
9389 | specs->type = build_complex_type (specs->type); |
9390 | } | |
9391 | break; | |
a6766312 KT |
9392 | case cts_int128: |
9393 | gcc_assert (!specs->long_p && !specs->short_p && !specs->long_long_p); | |
9394 | gcc_assert (!(specs->signed_p && specs->unsigned_p)); | |
9395 | specs->type = (specs->unsigned_p | |
9396 | ? int128_unsigned_type_node | |
9397 | : int128_integer_type_node); | |
9398 | if (specs->complex_p) | |
9399 | { | |
9400 | pedwarn (input_location, OPT_pedantic, | |
9401 | "ISO C does not support complex integer types"); | |
9402 | specs->type = build_complex_type (specs->type); | |
9403 | } | |
9404 | break; | |
98c3a782 JM |
9405 | case cts_int: |
9406 | gcc_assert (!(specs->long_p && specs->short_p)); | |
9407 | gcc_assert (!(specs->signed_p && specs->unsigned_p)); | |
9408 | if (specs->long_long_p) | |
9409 | specs->type = (specs->unsigned_p | |
9410 | ? long_long_unsigned_type_node | |
9411 | : long_long_integer_type_node); | |
9412 | else if (specs->long_p) | |
9413 | specs->type = (specs->unsigned_p | |
9414 | ? long_unsigned_type_node | |
9415 | : long_integer_type_node); | |
9416 | else if (specs->short_p) | |
9417 | specs->type = (specs->unsigned_p | |
9418 | ? short_unsigned_type_node | |
9419 | : short_integer_type_node); | |
9420 | else | |
9421 | specs->type = (specs->unsigned_p | |
9422 | ? unsigned_type_node | |
9423 | : integer_type_node); | |
9424 | if (specs->complex_p) | |
9425 | { | |
b8698a0f | 9426 | pedwarn (input_location, OPT_pedantic, |
fcf73884 | 9427 | "ISO C does not support complex integer types"); |
98c3a782 JM |
9428 | specs->type = build_complex_type (specs->type); |
9429 | } | |
9430 | break; | |
9431 | case cts_float: | |
9432 | gcc_assert (!specs->long_p && !specs->short_p | |
9433 | && !specs->signed_p && !specs->unsigned_p); | |
9434 | specs->type = (specs->complex_p | |
9435 | ? complex_float_type_node | |
9436 | : float_type_node); | |
9437 | break; | |
9438 | case cts_double: | |
9439 | gcc_assert (!specs->long_long_p && !specs->short_p | |
9440 | && !specs->signed_p && !specs->unsigned_p); | |
9441 | if (specs->long_p) | |
9442 | { | |
9443 | specs->type = (specs->complex_p | |
9444 | ? complex_long_double_type_node | |
9445 | : long_double_type_node); | |
9446 | } | |
9447 | else | |
9448 | { | |
9449 | specs->type = (specs->complex_p | |
9450 | ? complex_double_type_node | |
9451 | : double_type_node); | |
9452 | } | |
9453 | break; | |
9a8ce21f JG |
9454 | case cts_dfloat32: |
9455 | case cts_dfloat64: | |
9456 | case cts_dfloat128: | |
9457 | gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p | |
9458 | && !specs->signed_p && !specs->unsigned_p && !specs->complex_p); | |
9459 | if (specs->typespec_word == cts_dfloat32) | |
9460 | specs->type = dfloat32_type_node; | |
9461 | else if (specs->typespec_word == cts_dfloat64) | |
9462 | specs->type = dfloat64_type_node; | |
9463 | else | |
9464 | specs->type = dfloat128_type_node; | |
9465 | break; | |
ab22c1fa | 9466 | case cts_fract: |
754ccf7c JJ |
9467 | gcc_assert (!specs->complex_p); |
9468 | if (!targetm.fixed_point_supported_p ()) | |
9469 | specs->type = integer_type_node; | |
9470 | else if (specs->saturating_p) | |
ab22c1fa CF |
9471 | { |
9472 | if (specs->long_long_p) | |
9473 | specs->type = specs->unsigned_p | |
9474 | ? sat_unsigned_long_long_fract_type_node | |
9475 | : sat_long_long_fract_type_node; | |
9476 | else if (specs->long_p) | |
9477 | specs->type = specs->unsigned_p | |
9478 | ? sat_unsigned_long_fract_type_node | |
9479 | : sat_long_fract_type_node; | |
9480 | else if (specs->short_p) | |
9481 | specs->type = specs->unsigned_p | |
9482 | ? sat_unsigned_short_fract_type_node | |
9483 | : sat_short_fract_type_node; | |
9484 | else | |
9485 | specs->type = specs->unsigned_p | |
9486 | ? sat_unsigned_fract_type_node | |
9487 | : sat_fract_type_node; | |
754ccf7c | 9488 | } |
ab22c1fa CF |
9489 | else |
9490 | { | |
9491 | if (specs->long_long_p) | |
9492 | specs->type = specs->unsigned_p | |
9493 | ? unsigned_long_long_fract_type_node | |
9494 | : long_long_fract_type_node; | |
9495 | else if (specs->long_p) | |
9496 | specs->type = specs->unsigned_p | |
9497 | ? unsigned_long_fract_type_node | |
9498 | : long_fract_type_node; | |
9499 | else if (specs->short_p) | |
9500 | specs->type = specs->unsigned_p | |
9501 | ? unsigned_short_fract_type_node | |
9502 | : short_fract_type_node; | |
9503 | else | |
9504 | specs->type = specs->unsigned_p | |
9505 | ? unsigned_fract_type_node | |
9506 | : fract_type_node; | |
754ccf7c | 9507 | } |
ab22c1fa CF |
9508 | break; |
9509 | case cts_accum: | |
754ccf7c JJ |
9510 | gcc_assert (!specs->complex_p); |
9511 | if (!targetm.fixed_point_supported_p ()) | |
9512 | specs->type = integer_type_node; | |
9513 | else if (specs->saturating_p) | |
ab22c1fa CF |
9514 | { |
9515 | if (specs->long_long_p) | |
9516 | specs->type = specs->unsigned_p | |
9517 | ? sat_unsigned_long_long_accum_type_node | |
9518 | : sat_long_long_accum_type_node; | |
9519 | else if (specs->long_p) | |
9520 | specs->type = specs->unsigned_p | |
9521 | ? sat_unsigned_long_accum_type_node | |
9522 | : sat_long_accum_type_node; | |
9523 | else if (specs->short_p) | |
9524 | specs->type = specs->unsigned_p | |
9525 | ? sat_unsigned_short_accum_type_node | |
9526 | : sat_short_accum_type_node; | |
9527 | else | |
9528 | specs->type = specs->unsigned_p | |
9529 | ? sat_unsigned_accum_type_node | |
9530 | : sat_accum_type_node; | |
754ccf7c | 9531 | } |
ab22c1fa CF |
9532 | else |
9533 | { | |
9534 | if (specs->long_long_p) | |
9535 | specs->type = specs->unsigned_p | |
9536 | ? unsigned_long_long_accum_type_node | |
9537 | : long_long_accum_type_node; | |
9538 | else if (specs->long_p) | |
9539 | specs->type = specs->unsigned_p | |
9540 | ? unsigned_long_accum_type_node | |
9541 | : long_accum_type_node; | |
9542 | else if (specs->short_p) | |
9543 | specs->type = specs->unsigned_p | |
9544 | ? unsigned_short_accum_type_node | |
9545 | : short_accum_type_node; | |
9546 | else | |
9547 | specs->type = specs->unsigned_p | |
9548 | ? unsigned_accum_type_node | |
9549 | : accum_type_node; | |
754ccf7c | 9550 | } |
ab22c1fa | 9551 | break; |
98c3a782 JM |
9552 | default: |
9553 | gcc_unreachable (); | |
9554 | } | |
9555 | ||
9556 | return specs; | |
9557 | } | |
9558 | ||
db5f8b93 RH |
9559 | /* A subroutine of c_write_global_declarations. Perform final processing |
9560 | on one file scope's declarations (or the external scope's declarations), | |
9561 | GLOBALS. */ | |
9562 | ||
f75fbaf7 ZW |
9563 | static void |
9564 | c_write_global_declarations_1 (tree globals) | |
d1bd0ded | 9565 | { |
d1bd0ded | 9566 | tree decl; |
df4b9cfe | 9567 | bool reconsider; |
118a3a8b | 9568 | |
f75fbaf7 | 9569 | /* Process the decls in the order they were written. */ |
db5f8b93 | 9570 | for (decl = globals; decl; decl = TREE_CHAIN (decl)) |
bc4b653b | 9571 | { |
bc4b653b JM |
9572 | /* Check for used but undefined static functions using the C |
9573 | standard's definition of "used", and set TREE_NO_WARNING so | |
9574 | that check_global_declarations doesn't repeat the check. */ | |
9575 | if (TREE_CODE (decl) == FUNCTION_DECL | |
9576 | && DECL_INITIAL (decl) == 0 | |
9577 | && DECL_EXTERNAL (decl) | |
9578 | && !TREE_PUBLIC (decl) | |
9579 | && C_DECL_USED (decl)) | |
9580 | { | |
509c9d60 | 9581 | pedwarn (input_location, 0, "%q+F used but never defined", decl); |
bc4b653b JM |
9582 | TREE_NO_WARNING (decl) = 1; |
9583 | } | |
db5f8b93 RH |
9584 | |
9585 | wrapup_global_declaration_1 (decl); | |
bc4b653b | 9586 | } |
df4b9cfe JJ |
9587 | |
9588 | do | |
9589 | { | |
9590 | reconsider = false; | |
9591 | for (decl = globals; decl; decl = TREE_CHAIN (decl)) | |
9592 | reconsider |= wrapup_global_declaration_2 (decl); | |
9593 | } | |
9594 | while (reconsider); | |
9595 | ||
9596 | for (decl = globals; decl; decl = TREE_CHAIN (decl)) | |
9597 | check_global_declaration_1 (decl); | |
db5f8b93 | 9598 | } |
d1bd0ded | 9599 | |
db5f8b93 RH |
9600 | /* A subroutine of c_write_global_declarations Emit debug information for each |
9601 | of the declarations in GLOBALS. */ | |
118a3a8b | 9602 | |
db5f8b93 RH |
9603 | static void |
9604 | c_write_global_declarations_2 (tree globals) | |
9605 | { | |
9606 | tree decl; | |
9607 | ||
9608 | for (decl = globals; decl ; decl = TREE_CHAIN (decl)) | |
9609 | debug_hooks->global_decl (decl); | |
d1bd0ded GK |
9610 | } |
9611 | ||
9cc54940 AC |
9612 | /* Callback to collect a source_ref from a DECL. */ |
9613 | ||
9614 | static void | |
9615 | collect_source_ref_cb (tree decl) | |
9616 | { | |
9617 | if (!DECL_IS_BUILTIN (decl)) | |
9618 | collect_source_ref (LOCATION_FILE (decl_sloc (decl, false))); | |
9619 | } | |
9620 | ||
9621 | /* Collect all references relevant to SOURCE_FILE. */ | |
9622 | ||
9623 | static void | |
9624 | collect_all_refs (const char *source_file) | |
9625 | { | |
9626 | tree t; | |
9627 | ||
9628 | for (t = all_translation_units; t; t = TREE_CHAIN (t)) | |
9629 | collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t)), source_file); | |
9630 | } | |
9631 | ||
9632 | /* Iterate over all global declarations and call CALLBACK. */ | |
9633 | ||
9634 | static void | |
9635 | for_each_global_decl (void (*callback) (tree decl)) | |
9636 | { | |
9637 | tree t; | |
9638 | tree decls; | |
9639 | tree decl; | |
9640 | ||
9641 | for (t = all_translation_units; t; t = TREE_CHAIN (t)) | |
9642 | { | |
9643 | decls = DECL_INITIAL (t); | |
9644 | for (decl = BLOCK_VARS (decls); decl; decl = TREE_CHAIN (decl)) | |
9645 | callback (decl); | |
9646 | } | |
9647 | } | |
9648 | ||
db5f8b93 RH |
9649 | /* Preserve the external declarations scope across a garbage collect. */ |
9650 | static GTY(()) tree ext_block; | |
9651 | ||
d1bd0ded | 9652 | void |
f75fbaf7 | 9653 | c_write_global_declarations (void) |
d1bd0ded | 9654 | { |
db5f8b93 | 9655 | tree t; |
e13e48e7 | 9656 | |
f75fbaf7 ZW |
9657 | /* We don't want to do this if generating a PCH. */ |
9658 | if (pch_file) | |
9659 | return; | |
d1bd0ded | 9660 | |
a406865a RG |
9661 | /* Don't waste time on further processing if -fsyntax-only. |
9662 | Continue for warning and errors issued during lowering though. */ | |
9663 | if (flag_syntax_only) | |
9affb2c7 ZW |
9664 | return; |
9665 | ||
36c1b0de ZW |
9666 | /* Close the external scope. */ |
9667 | ext_block = pop_scope (); | |
9668 | external_scope = 0; | |
366de0ce | 9669 | gcc_assert (!current_scope); |
36c1b0de | 9670 | |
9cc54940 AC |
9671 | /* Handle -fdump-ada-spec[-slim]. */ |
9672 | if (dump_enabled_p (TDI_ada)) | |
9673 | { | |
9674 | /* Build a table of files to generate specs for */ | |
9675 | if (get_dump_file_info (TDI_ada)->flags & TDF_SLIM) | |
9676 | collect_source_ref (main_input_filename); | |
9677 | else | |
9678 | for_each_global_decl (collect_source_ref_cb); | |
9679 | ||
9680 | dump_ada_specs (collect_all_refs, NULL); | |
9681 | } | |
9682 | ||
7f3b2bda GDR |
9683 | if (ext_block) |
9684 | { | |
9685 | tree tmp = BLOCK_VARS (ext_block); | |
9686 | int flags; | |
9687 | FILE * stream = dump_begin (TDI_tu, &flags); | |
9688 | if (stream && tmp) | |
c22cacf3 MS |
9689 | { |
9690 | dump_node (tmp, flags & ~TDF_SLIM, stream); | |
9691 | dump_end (TDI_tu, stream); | |
9692 | } | |
7f3b2bda | 9693 | } |
db5f8b93 RH |
9694 | |
9695 | /* Process all file scopes in this compilation, and the external_scope, | |
9696 | through wrapup_global_declarations and check_global_declarations. */ | |
9697 | for (t = all_translation_units; t; t = TREE_CHAIN (t)) | |
9698 | c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t))); | |
36c1b0de ZW |
9699 | c_write_global_declarations_1 (BLOCK_VARS (ext_block)); |
9700 | ||
36c1b0de ZW |
9701 | /* We're done parsing; proceed to optimize and emit assembly. |
9702 | FIXME: shouldn't be the front end's responsibility to call this. */ | |
a406865a | 9703 | cgraph_finalize_compilation_unit (); |
db5f8b93 RH |
9704 | |
9705 | /* After cgraph has had a chance to emit everything that's going to | |
9706 | be emitted, output debug information for globals. */ | |
1da2ed5f | 9707 | if (!seen_error ()) |
db5f8b93 RH |
9708 | { |
9709 | timevar_push (TV_SYMOUT); | |
9710 | for (t = all_translation_units; t; t = TREE_CHAIN (t)) | |
9711 | c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t))); | |
9712 | c_write_global_declarations_2 (BLOCK_VARS (ext_block)); | |
9713 | timevar_pop (TV_SYMOUT); | |
9714 | } | |
9715 | ||
9716 | ext_block = NULL; | |
d1bd0ded GK |
9717 | } |
9718 | ||
bffad7f1 SB |
9719 | /* Register reserved keyword WORD as qualifier for address space AS. */ |
9720 | ||
9721 | void | |
9722 | c_register_addr_space (const char *word, addr_space_t as) | |
9723 | { | |
9724 | int rid = RID_FIRST_ADDR_SPACE + as; | |
9725 | tree id; | |
9726 | ||
9727 | /* Address space qualifiers are only supported | |
9728 | in C with GNU extensions enabled. */ | |
9729 | if (c_dialect_objc () || flag_no_asm) | |
9730 | return; | |
9731 | ||
9732 | id = get_identifier (word); | |
9733 | C_SET_RID_CODE (id, rid); | |
9734 | C_IS_RESERVED_WORD (id) = 1; | |
9735 | ridpointers [rid] = id; | |
9736 | } | |
9737 | ||
e2500fed | 9738 | #include "gt-c-decl.h" |