]>
Commit | Line | Data |
---|---|---|
51e29401 | 1 | /* Process declarations and variables for C compiler. |
f8dac6eb | 2 | Copyright (C) 1988, 92-97, 1998 Free Software Foundation, Inc. |
51e29401 RS |
3 | |
4 | This file is part of GNU CC. | |
5 | ||
6 | GNU CC is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU CC is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU CC; see the file COPYING. If not, write to | |
940d9d63 RK |
18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
51e29401 RS |
20 | |
21 | ||
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" |
51e29401 RS |
31 | #include "tree.h" |
32 | #include "flags.h" | |
e14417fa | 33 | #include "output.h" |
51e29401 RS |
34 | #include "c-tree.h" |
35 | #include "c-lex.h" | |
5f6da302 | 36 | #include "toplev.h" |
51e29401 | 37 | |
a0d85b75 DB |
38 | #if USE_CPPLIB |
39 | #include "cpplib.h" | |
40 | extern cpp_reader parse_in; | |
41 | extern cpp_options parse_options; | |
42 | static int cpp_initialized; | |
43 | #endif | |
44 | ||
51e29401 RS |
45 | /* In grokdeclarator, distinguish syntactic contexts of declarators. */ |
46 | enum decl_context | |
47 | { NORMAL, /* Ordinary declaration */ | |
48 | FUNCDEF, /* Function definition */ | |
49 | PARM, /* Declaration of parm before function body */ | |
50 | FIELD, /* Declaration inside struct or union */ | |
51 | BITFIELD, /* Likewise but with specified width */ | |
52 | TYPENAME}; /* Typename (inside cast or sizeof) */ | |
53 | ||
51e29401 RS |
54 | #ifndef CHAR_TYPE_SIZE |
55 | #define CHAR_TYPE_SIZE BITS_PER_UNIT | |
56 | #endif | |
57 | ||
58 | #ifndef SHORT_TYPE_SIZE | |
59 | #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2)) | |
60 | #endif | |
61 | ||
62 | #ifndef INT_TYPE_SIZE | |
63 | #define INT_TYPE_SIZE BITS_PER_WORD | |
64 | #endif | |
65 | ||
66 | #ifndef LONG_TYPE_SIZE | |
67 | #define LONG_TYPE_SIZE BITS_PER_WORD | |
68 | #endif | |
69 | ||
70 | #ifndef LONG_LONG_TYPE_SIZE | |
71 | #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2) | |
72 | #endif | |
73 | ||
74 | #ifndef WCHAR_UNSIGNED | |
75 | #define WCHAR_UNSIGNED 0 | |
76 | #endif | |
77 | ||
78 | #ifndef FLOAT_TYPE_SIZE | |
79 | #define FLOAT_TYPE_SIZE BITS_PER_WORD | |
80 | #endif | |
81 | ||
82 | #ifndef DOUBLE_TYPE_SIZE | |
83 | #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2) | |
84 | #endif | |
85 | ||
86 | #ifndef LONG_DOUBLE_TYPE_SIZE | |
87 | #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2) | |
88 | #endif | |
89 | ||
90 | /* We let tm.h override the types used here, to handle trivial differences | |
91 | such as the choice of unsigned int or long unsigned int for size_t. | |
92 | When machines start needing nontrivial differences in the size type, | |
93 | it would be best to do something here to figure out automatically | |
94 | from other information what type to use. */ | |
95 | ||
96 | #ifndef SIZE_TYPE | |
97 | #define SIZE_TYPE "long unsigned int" | |
98 | #endif | |
99 | ||
100 | #ifndef PTRDIFF_TYPE | |
101 | #define PTRDIFF_TYPE "long int" | |
102 | #endif | |
103 | ||
104 | #ifndef WCHAR_TYPE | |
105 | #define WCHAR_TYPE "int" | |
106 | #endif | |
107 | \f | |
108 | /* a node which has tree code ERROR_MARK, and whose type is itself. | |
109 | All erroneous expressions are replaced with this node. All functions | |
110 | that accept nodes as arguments should avoid generating error messages | |
111 | if this node is one of the arguments, since it is undesirable to get | |
112 | multiple error messages from one error in the input. */ | |
113 | ||
114 | tree error_mark_node; | |
115 | ||
116 | /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */ | |
117 | ||
118 | tree short_integer_type_node; | |
119 | tree integer_type_node; | |
120 | tree long_integer_type_node; | |
121 | tree long_long_integer_type_node; | |
122 | ||
123 | tree short_unsigned_type_node; | |
124 | tree unsigned_type_node; | |
125 | tree long_unsigned_type_node; | |
126 | tree long_long_unsigned_type_node; | |
127 | ||
f444e553 JM |
128 | tree boolean_type_node; |
129 | tree boolean_false_node; | |
130 | tree boolean_true_node; | |
131 | ||
51e29401 RS |
132 | tree ptrdiff_type_node; |
133 | ||
134 | tree unsigned_char_type_node; | |
135 | tree signed_char_type_node; | |
136 | tree char_type_node; | |
137 | tree wchar_type_node; | |
138 | tree signed_wchar_type_node; | |
139 | tree unsigned_wchar_type_node; | |
140 | ||
141 | tree float_type_node; | |
142 | tree double_type_node; | |
143 | tree long_double_type_node; | |
144 | ||
5ab10c42 RS |
145 | tree complex_integer_type_node; |
146 | tree complex_float_type_node; | |
147 | tree complex_double_type_node; | |
148 | tree complex_long_double_type_node; | |
149 | ||
ac4f24e7 RS |
150 | tree intQI_type_node; |
151 | tree intHI_type_node; | |
152 | tree intSI_type_node; | |
153 | tree intDI_type_node; | |
a6d7e156 | 154 | tree intTI_type_node; |
ac4f24e7 RS |
155 | |
156 | tree unsigned_intQI_type_node; | |
157 | tree unsigned_intHI_type_node; | |
158 | tree unsigned_intSI_type_node; | |
159 | tree unsigned_intDI_type_node; | |
a6d7e156 | 160 | tree unsigned_intTI_type_node; |
ac4f24e7 | 161 | |
51e29401 RS |
162 | /* a VOID_TYPE node. */ |
163 | ||
164 | tree void_type_node; | |
165 | ||
166 | /* Nodes for types `void *' and `const void *'. */ | |
167 | ||
168 | tree ptr_type_node, const_ptr_type_node; | |
169 | ||
170 | /* Nodes for types `char *' and `const char *'. */ | |
171 | ||
172 | tree string_type_node, const_string_type_node; | |
173 | ||
fba9adc6 | 174 | /* Type `char[SOMENUMBER]'. |
51e29401 RS |
175 | Used when an array of char is needed and the size is irrelevant. */ |
176 | ||
177 | tree char_array_type_node; | |
178 | ||
fba9adc6 | 179 | /* Type `int[SOMENUMBER]' or something like it. |
51e29401 RS |
180 | Used when an array of int needed and the size is irrelevant. */ |
181 | ||
182 | tree int_array_type_node; | |
183 | ||
fba9adc6 | 184 | /* Type `wchar_t[SOMENUMBER]' or something like it. |
51e29401 RS |
185 | Used when a wide string literal is created. */ |
186 | ||
187 | tree wchar_array_type_node; | |
188 | ||
189 | /* type `int ()' -- used for implicit declaration of functions. */ | |
190 | ||
191 | tree default_function_type; | |
192 | ||
193 | /* function types `double (double)' and `double (double, double)', etc. */ | |
194 | ||
195 | tree double_ftype_double, double_ftype_double_double; | |
196 | tree int_ftype_int, long_ftype_long; | |
732149f9 RK |
197 | tree float_ftype_float; |
198 | tree ldouble_ftype_ldouble; | |
51e29401 RS |
199 | |
200 | /* Function type `void (void *, void *, int)' and similar ones */ | |
201 | ||
202 | tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int; | |
203 | ||
204 | /* Function type `char *(char *, char *)' and similar ones */ | |
205 | tree string_ftype_ptr_ptr, int_ftype_string_string; | |
206 | ||
51e29401 RS |
207 | /* Function type `int (const void *, const void *, size_t)' */ |
208 | tree int_ftype_cptr_cptr_sizet; | |
209 | ||
210 | /* Two expressions that are constants with value zero. | |
211 | The first is of type `int', the second of type `void *'. */ | |
212 | ||
213 | tree integer_zero_node; | |
214 | tree null_pointer_node; | |
215 | ||
216 | /* A node for the integer constant 1. */ | |
217 | ||
218 | tree integer_one_node; | |
219 | ||
220 | /* Nonzero if we have seen an invalid cross reference | |
221 | to a struct, union, or enum, but not yet printed the message. */ | |
222 | ||
223 | tree pending_invalid_xref; | |
224 | /* File and line to appear in the eventual error message. */ | |
225 | char *pending_invalid_xref_file; | |
226 | int pending_invalid_xref_line; | |
227 | ||
228 | /* While defining an enum type, this is 1 plus the last enumerator | |
18192b41 RK |
229 | constant value. Note that will do not have to save this or `enum_overflow' |
230 | around nested function definition since such a definition could only | |
231 | occur in an enum value expression and we don't use these variables in | |
232 | that case. */ | |
51e29401 RS |
233 | |
234 | static tree enum_next_value; | |
235 | ||
93e3ba4f RS |
236 | /* Nonzero means that there was overflow computing enum_next_value. */ |
237 | ||
238 | static int enum_overflow; | |
239 | ||
51e29401 RS |
240 | /* Parsing a function declarator leaves a list of parameter names |
241 | or a chain or parameter decls here. */ | |
242 | ||
243 | static tree last_function_parms; | |
244 | ||
245 | /* Parsing a function declarator leaves here a chain of structure | |
246 | and enum types declared in the parmlist. */ | |
247 | ||
248 | static tree last_function_parm_tags; | |
249 | ||
250 | /* After parsing the declarator that starts a function definition, | |
251 | `start_function' puts here the list of parameter names or chain of decls. | |
252 | `store_parm_decls' finds it here. */ | |
253 | ||
254 | static tree current_function_parms; | |
255 | ||
256 | /* Similar, for last_function_parm_tags. */ | |
257 | static tree current_function_parm_tags; | |
258 | ||
50a9145c JW |
259 | /* Similar, for the file and line that the prototype came from if this is |
260 | an old-style definition. */ | |
261 | static char *current_function_prototype_file; | |
262 | static int current_function_prototype_line; | |
263 | ||
51e29401 RS |
264 | /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function |
265 | that have names. Here so we can clear out their names' definitions | |
266 | at the end of the function. */ | |
267 | ||
c9c30903 | 268 | static tree named_labels; |
51e29401 RS |
269 | |
270 | /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */ | |
271 | ||
272 | static tree shadowed_labels; | |
273 | ||
274 | /* Nonzero when store_parm_decls is called indicates a varargs function. | |
275 | Value not meaningful after store_parm_decls. */ | |
276 | ||
277 | static int c_function_varargs; | |
278 | ||
279 | /* The FUNCTION_DECL for the function currently being compiled, | |
280 | or 0 if between functions. */ | |
281 | tree current_function_decl; | |
282 | ||
283 | /* Set to 0 at beginning of a function definition, set to 1 if | |
284 | a return statement that specifies a return value is seen. */ | |
285 | ||
286 | int current_function_returns_value; | |
287 | ||
288 | /* Set to 0 at beginning of a function definition, set to 1 if | |
289 | a return statement with no argument is seen. */ | |
290 | ||
291 | int current_function_returns_null; | |
292 | ||
293 | /* Set to nonzero by `grokdeclarator' for a function | |
294 | whose return type is defaulted, if warnings for this are desired. */ | |
295 | ||
296 | static int warn_about_return_type; | |
297 | ||
929f3671 | 298 | /* Nonzero when starting a function declared `extern inline'. */ |
51e29401 RS |
299 | |
300 | static int current_extern_inline; | |
301 | \f | |
302 | /* For each binding contour we allocate a binding_level structure | |
303 | * which records the names defined in that contour. | |
304 | * Contours include: | |
305 | * 0) the global one | |
306 | * 1) one for each function definition, | |
307 | * where internal declarations of the parameters appear. | |
308 | * 2) one for each compound statement, | |
309 | * to record its declarations. | |
310 | * | |
311 | * The current meaning of a name can be found by searching the levels from | |
312 | * the current one out to the global one. | |
313 | */ | |
314 | ||
315 | /* Note that the information in the `names' component of the global contour | |
316 | is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */ | |
317 | ||
318 | struct binding_level | |
319 | { | |
320 | /* A chain of _DECL nodes for all variables, constants, functions, | |
321 | and typedef types. These are in the reverse of the order supplied. | |
322 | */ | |
323 | tree names; | |
324 | ||
325 | /* A list of structure, union and enum definitions, | |
326 | * for looking up tag names. | |
327 | * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name, | |
328 | * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE, | |
329 | * or ENUMERAL_TYPE node. | |
330 | */ | |
331 | tree tags; | |
332 | ||
333 | /* For each level, a list of shadowed outer-level local definitions | |
334 | to be restored when this level is popped. | |
335 | Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and | |
336 | whose TREE_VALUE is its old definition (a kind of ..._DECL node). */ | |
337 | tree shadowed; | |
338 | ||
339 | /* For each level (except not the global one), | |
340 | a chain of BLOCK nodes for all the levels | |
341 | that were entered and exited one level down. */ | |
342 | tree blocks; | |
343 | ||
3bf40d18 RS |
344 | /* The BLOCK node for this level, if one has been preallocated. |
345 | If 0, the BLOCK is allocated (if needed) when the level is popped. */ | |
346 | tree this_block; | |
347 | ||
51e29401 RS |
348 | /* The binding level which this one is contained in (inherits from). */ |
349 | struct binding_level *level_chain; | |
350 | ||
351 | /* Nonzero for the level that holds the parameters of a function. */ | |
51e29401 RS |
352 | char parm_flag; |
353 | ||
354 | /* Nonzero if this level "doesn't exist" for tags. */ | |
355 | char tag_transparent; | |
356 | ||
357 | /* Nonzero if sublevels of this level "don't exist" for tags. | |
358 | This is set in the parm level of a function definition | |
359 | while reading the function body, so that the outermost block | |
360 | of the function body will be tag-transparent. */ | |
361 | char subblocks_tag_transparent; | |
362 | ||
363 | /* Nonzero means make a BLOCK for this level regardless of all else. */ | |
364 | char keep; | |
365 | ||
366 | /* Nonzero means make a BLOCK if this level has any subblocks. */ | |
367 | char keep_if_subblocks; | |
368 | ||
369 | /* Number of decls in `names' that have incomplete | |
370 | structure or union types. */ | |
371 | int n_incomplete; | |
372 | ||
373 | /* A list of decls giving the (reversed) specified order of parms, | |
374 | not including any forward-decls in the parmlist. | |
375 | This is so we can put the parms in proper order for assign_parms. */ | |
376 | tree parm_order; | |
377 | }; | |
378 | ||
379 | #define NULL_BINDING_LEVEL (struct binding_level *) NULL | |
380 | ||
381 | /* The binding level currently in effect. */ | |
382 | ||
383 | static struct binding_level *current_binding_level; | |
384 | ||
385 | /* A chain of binding_level structures awaiting reuse. */ | |
386 | ||
387 | static struct binding_level *free_binding_level; | |
388 | ||
389 | /* The outermost binding level, for names of file scope. | |
390 | This is created when the compiler is started and exists | |
391 | through the entire run. */ | |
392 | ||
393 | static struct binding_level *global_binding_level; | |
394 | ||
395 | /* Binding level structures are initialized by copying this one. */ | |
396 | ||
397 | static struct binding_level clear_binding_level | |
014aa47e RK |
398 | = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0, |
399 | NULL}; | |
51e29401 RS |
400 | |
401 | /* Nonzero means unconditionally make a BLOCK for the next level pushed. */ | |
402 | ||
403 | static int keep_next_level_flag; | |
404 | ||
405 | /* Nonzero means make a BLOCK for the next level pushed | |
406 | if it has subblocks. */ | |
407 | ||
408 | static int keep_next_if_subblocks; | |
409 | ||
410 | /* The chain of outer levels of label scopes. | |
411 | This uses the same data structure used for binding levels, | |
412 | but it works differently: each link in the chain records | |
413 | saved values of named_labels and shadowed_labels for | |
414 | a label binding level outside the current one. */ | |
415 | ||
416 | static struct binding_level *label_level_chain; | |
417 | ||
2c5f4139 JM |
418 | /* Functions called automatically at the beginning and end of execution. */ |
419 | ||
420 | tree static_ctors, static_dtors; | |
421 | ||
51e29401 RS |
422 | /* Forward declarations. */ |
423 | ||
b423779d RK |
424 | static struct binding_level * make_binding_level PROTO((void)); |
425 | static void clear_limbo_values PROTO((tree)); | |
426 | static int duplicate_decls PROTO((tree, tree, int)); | |
427 | static char *redeclaration_error_message PROTO((tree, tree)); | |
428 | static void storedecls PROTO((tree)); | |
429 | static void storetags PROTO((tree)); | |
430 | static tree lookup_tag PROTO((enum tree_code, tree, | |
431 | struct binding_level *, int)); | |
432 | static tree lookup_tag_reverse PROTO((tree)); | |
433 | static tree grokdeclarator PROTO((tree, tree, enum decl_context, | |
434 | int)); | |
435 | static tree grokparms PROTO((tree, int)); | |
c6d40741 | 436 | static int field_decl_cmp PROTO((const GENERIC_PTR, const GENERIC_PTR)); |
b423779d | 437 | static void layout_array_type PROTO((tree)); |
51e29401 RS |
438 | \f |
439 | /* C-specific option variables. */ | |
440 | ||
441 | /* Nonzero means allow type mismatches in conditional expressions; | |
442 | just make their values `void'. */ | |
443 | ||
444 | int flag_cond_mismatch; | |
445 | ||
446 | /* Nonzero means give `double' the same size as `float'. */ | |
447 | ||
448 | int flag_short_double; | |
449 | ||
450 | /* Nonzero means don't recognize the keyword `asm'. */ | |
451 | ||
452 | int flag_no_asm; | |
453 | ||
fc3ffe83 | 454 | /* Nonzero means don't recognize any builtin functions. */ |
51e29401 RS |
455 | |
456 | int flag_no_builtin; | |
457 | ||
fc3ffe83 RK |
458 | /* Nonzero means don't recognize the non-ANSI builtin functions. |
459 | -ansi sets this. */ | |
460 | ||
461 | int flag_no_nonansi_builtin; | |
462 | ||
51e29401 RS |
463 | /* Nonzero means do some things the same way PCC does. */ |
464 | ||
465 | int flag_traditional; | |
466 | ||
b8705e61 RK |
467 | /* Nonzero means that we have builtin functions, and main is an int */ |
468 | ||
469 | int flag_hosted = 1; | |
470 | ||
55b4742b | 471 | /* Nonzero means to allow single precision math even if we're generally |
0f41302f | 472 | being traditional. */ |
55b4742b RS |
473 | int flag_allow_single_precision = 0; |
474 | ||
51e29401 RS |
475 | /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */ |
476 | ||
477 | int flag_signed_bitfields = 1; | |
7a0347ff | 478 | int explicit_flag_signed_bitfields = 0; |
51e29401 RS |
479 | |
480 | /* Nonzero means handle `#ident' directives. 0 means ignore them. */ | |
481 | ||
482 | int flag_no_ident = 0; | |
483 | ||
e9a25f70 JL |
484 | /* Nonzero means warn about use of implicit int. */ |
485 | ||
486 | int warn_implicit_int; | |
51e29401 | 487 | |
e9a25f70 JL |
488 | /* Nonzero means message about use of implicit function declarations; |
489 | 1 means warning; 2 means error. */ | |
490 | ||
491 | int mesg_implicit_function_declaration; | |
51e29401 RS |
492 | |
493 | /* Nonzero means give string constants the type `const char *' | |
494 | to get extra warnings from them. These warnings will be too numerous | |
495 | to be useful, except in thoroughly ANSIfied programs. */ | |
496 | ||
497 | int warn_write_strings; | |
498 | ||
499 | /* Nonzero means warn about pointer casts that can drop a type qualifier | |
500 | from the pointer target type. */ | |
501 | ||
502 | int warn_cast_qual; | |
503 | ||
5c8902bb RK |
504 | /* Nonzero means warn when casting a function call to a type that does |
505 | not match the return type (e.g. (float)sqrt() or (anything*)malloc() | |
506 | when there is no previous declaration of sqrt or malloc. */ | |
507 | ||
508 | int warn_bad_function_cast; | |
509 | ||
51e29401 RS |
510 | /* Warn about traditional constructs whose meanings changed in ANSI C. */ |
511 | ||
512 | int warn_traditional; | |
513 | ||
514 | /* Nonzero means warn about sizeof(function) or addition/subtraction | |
515 | of function pointers. */ | |
516 | ||
517 | int warn_pointer_arith; | |
518 | ||
519 | /* Nonzero means warn for non-prototype function decls | |
520 | or non-prototyped defs without previous prototype. */ | |
521 | ||
522 | int warn_strict_prototypes; | |
523 | ||
524 | /* Nonzero means warn for any global function def | |
525 | without separate previous prototype decl. */ | |
526 | ||
527 | int warn_missing_prototypes; | |
528 | ||
1474fe46 RK |
529 | /* Nonzero means warn for any global function def |
530 | without separate previous decl. */ | |
531 | ||
532 | int warn_missing_declarations; | |
533 | ||
51e29401 RS |
534 | /* Nonzero means warn about multiple (redundant) decls for the same single |
535 | variable or function. */ | |
536 | ||
537 | int warn_redundant_decls = 0; | |
538 | ||
539 | /* Nonzero means warn about extern declarations of objects not at | |
540 | file-scope level and about *all* declarations of functions (whether | |
541 | extern or static) not at file-scope level. Note that we exclude | |
542 | implicit function declarations. To get warnings about those, use | |
543 | -Wimplicit. */ | |
544 | ||
545 | int warn_nested_externs = 0; | |
546 | ||
0f41302f | 547 | /* Warn about *printf or *scanf format/argument anomalies. */ |
51e29401 RS |
548 | |
549 | int warn_format; | |
550 | ||
551 | /* Warn about a subscript that has type char. */ | |
552 | ||
553 | int warn_char_subscripts = 0; | |
554 | ||
555 | /* Warn if a type conversion is done that might have confusing results. */ | |
556 | ||
557 | int warn_conversion; | |
558 | ||
559 | /* Warn if adding () is suggested. */ | |
560 | ||
929f3671 | 561 | int warn_parentheses; |
51e29401 | 562 | |
36e6fa69 RS |
563 | /* Warn if initializer is not completely bracketed. */ |
564 | ||
565 | int warn_missing_braces; | |
566 | ||
b8705e61 RK |
567 | /* Warn if main is suspicious. */ |
568 | ||
569 | int warn_main; | |
570 | ||
d300e551 NC |
571 | /* Warn about #pragma directives that are not recognised. */ |
572 | ||
573 | int warn_unknown_pragmas = 0; /* Tri state variable. */ | |
574 | ||
407cb092 PE |
575 | /* Warn about comparison of signed and unsigned values. |
576 | If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */ | |
d51f9363 | 577 | |
407cb092 | 578 | int warn_sign_compare = -1; |
d51f9363 | 579 | |
39b3bed7 | 580 | /* Nonzero means `$' can be in an identifier. */ |
51e29401 RS |
581 | |
582 | #ifndef DOLLARS_IN_IDENTIFIERS | |
583 | #define DOLLARS_IN_IDENTIFIERS 1 | |
584 | #endif | |
39b3bed7 | 585 | int dollars_in_ident = DOLLARS_IN_IDENTIFIERS; |
51e29401 | 586 | |
51e29401 | 587 | /* Decode the string P as a language-specific option for C. |
a0d85b75 | 588 | Return the number of strings consumed. */ |
51e29401 RS |
589 | |
590 | int | |
a0d85b75 DB |
591 | c_decode_option (argc, argv) |
592 | int argc; | |
593 | char **argv; | |
51e29401 | 594 | { |
a0d85b75 DB |
595 | int strings_processed; |
596 | char *p = argv[0]; | |
597 | #if USE_CPPLIB | |
598 | if (! cpp_initialized) | |
599 | { | |
600 | cpp_reader_init (&parse_in); | |
601 | parse_in.data = &parse_options; | |
602 | cpp_options_init (&parse_options); | |
603 | cpp_initialized = 1; | |
604 | } | |
605 | strings_processed = cpp_handle_option (&parse_in, argc, argv); | |
606 | #else | |
607 | strings_processed = 0; | |
608 | #endif /* ! USE_CPPLIB */ | |
609 | ||
51e29401 RS |
610 | if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional")) |
611 | { | |
612 | flag_traditional = 1; | |
613 | flag_writable_strings = 1; | |
51e29401 | 614 | } |
55b4742b RS |
615 | else if (!strcmp (p, "-fallow-single-precision")) |
616 | flag_allow_single_precision = 1; | |
b8705e61 RK |
617 | else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding")) |
618 | { | |
619 | flag_hosted = 1; | |
620 | flag_no_builtin = 0; | |
621 | } | |
622 | else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted")) | |
623 | { | |
624 | flag_hosted = 0; | |
625 | flag_no_builtin = 1; | |
626 | /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */ | |
627 | if (warn_main == 2) | |
628 | warn_main = 0; | |
629 | } | |
4ecc65ac RS |
630 | else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional")) |
631 | { | |
632 | flag_traditional = 0; | |
633 | flag_writable_strings = 0; | |
4ecc65ac | 634 | } |
a419ff54 | 635 | else if (!strcmp (p, "-fdollars-in-identifiers")) |
39b3bed7 | 636 | dollars_in_ident = 1; |
014aa47e | 637 | else if (!strcmp (p, "-fno-dollars-in-identifiers")) |
a419ff54 | 638 | dollars_in_ident = 0; |
51e29401 RS |
639 | else if (!strcmp (p, "-fsigned-char")) |
640 | flag_signed_char = 1; | |
641 | else if (!strcmp (p, "-funsigned-char")) | |
642 | flag_signed_char = 0; | |
643 | else if (!strcmp (p, "-fno-signed-char")) | |
644 | flag_signed_char = 0; | |
645 | else if (!strcmp (p, "-fno-unsigned-char")) | |
646 | flag_signed_char = 1; | |
7a0347ff RS |
647 | else if (!strcmp (p, "-fsigned-bitfields") |
648 | || !strcmp (p, "-fno-unsigned-bitfields")) | |
649 | { | |
650 | flag_signed_bitfields = 1; | |
651 | explicit_flag_signed_bitfields = 1; | |
652 | } | |
653 | else if (!strcmp (p, "-funsigned-bitfields") | |
654 | || !strcmp (p, "-fno-signed-bitfields")) | |
655 | { | |
656 | flag_signed_bitfields = 0; | |
657 | explicit_flag_signed_bitfields = 1; | |
658 | } | |
51e29401 RS |
659 | else if (!strcmp (p, "-fshort-enums")) |
660 | flag_short_enums = 1; | |
661 | else if (!strcmp (p, "-fno-short-enums")) | |
662 | flag_short_enums = 0; | |
663 | else if (!strcmp (p, "-fcond-mismatch")) | |
664 | flag_cond_mismatch = 1; | |
665 | else if (!strcmp (p, "-fno-cond-mismatch")) | |
666 | flag_cond_mismatch = 0; | |
667 | else if (!strcmp (p, "-fshort-double")) | |
668 | flag_short_double = 1; | |
669 | else if (!strcmp (p, "-fno-short-double")) | |
670 | flag_short_double = 0; | |
671 | else if (!strcmp (p, "-fasm")) | |
672 | flag_no_asm = 0; | |
673 | else if (!strcmp (p, "-fno-asm")) | |
674 | flag_no_asm = 1; | |
675 | else if (!strcmp (p, "-fbuiltin")) | |
676 | flag_no_builtin = 0; | |
677 | else if (!strcmp (p, "-fno-builtin")) | |
678 | flag_no_builtin = 1; | |
679 | else if (!strcmp (p, "-fno-ident")) | |
680 | flag_no_ident = 1; | |
681 | else if (!strcmp (p, "-fident")) | |
682 | flag_no_ident = 0; | |
683 | else if (!strcmp (p, "-ansi")) | |
39b3bed7 | 684 | flag_no_asm = 1, flag_no_nonansi_builtin = 1; |
e9a25f70 JL |
685 | else if (!strcmp (p, "-Werror-implicit-function-declaration")) |
686 | mesg_implicit_function_declaration = 2; | |
687 | else if (!strcmp (p, "-Wimplicit-function-declaration")) | |
688 | mesg_implicit_function_declaration = 1; | |
689 | else if (!strcmp (p, "-Wno-implicit-function-declaration")) | |
690 | mesg_implicit_function_declaration = 0; | |
691 | else if (!strcmp (p, "-Wimplicit-int")) | |
692 | warn_implicit_int = 1; | |
693 | else if (!strcmp (p, "-Wno-implicit-int")) | |
694 | warn_implicit_int = 0; | |
51e29401 | 695 | else if (!strcmp (p, "-Wimplicit")) |
e9a25f70 JL |
696 | { |
697 | warn_implicit_int = 1; | |
698 | if (mesg_implicit_function_declaration != 2) | |
699 | mesg_implicit_function_declaration = 1; | |
700 | } | |
51e29401 | 701 | else if (!strcmp (p, "-Wno-implicit")) |
e9a25f70 | 702 | warn_implicit_int = 0, mesg_implicit_function_declaration = 0; |
51e29401 RS |
703 | else if (!strcmp (p, "-Wwrite-strings")) |
704 | warn_write_strings = 1; | |
705 | else if (!strcmp (p, "-Wno-write-strings")) | |
706 | warn_write_strings = 0; | |
707 | else if (!strcmp (p, "-Wcast-qual")) | |
708 | warn_cast_qual = 1; | |
709 | else if (!strcmp (p, "-Wno-cast-qual")) | |
710 | warn_cast_qual = 0; | |
5c8902bb RK |
711 | else if (!strcmp (p, "-Wbad-function-cast")) |
712 | warn_bad_function_cast = 1; | |
713 | else if (!strcmp (p, "-Wno-bad-function-cast")) | |
714 | warn_bad_function_cast = 0; | |
51e29401 RS |
715 | else if (!strcmp (p, "-Wpointer-arith")) |
716 | warn_pointer_arith = 1; | |
717 | else if (!strcmp (p, "-Wno-pointer-arith")) | |
718 | warn_pointer_arith = 0; | |
719 | else if (!strcmp (p, "-Wstrict-prototypes")) | |
720 | warn_strict_prototypes = 1; | |
721 | else if (!strcmp (p, "-Wno-strict-prototypes")) | |
722 | warn_strict_prototypes = 0; | |
723 | else if (!strcmp (p, "-Wmissing-prototypes")) | |
724 | warn_missing_prototypes = 1; | |
725 | else if (!strcmp (p, "-Wno-missing-prototypes")) | |
726 | warn_missing_prototypes = 0; | |
1474fe46 RK |
727 | else if (!strcmp (p, "-Wmissing-declarations")) |
728 | warn_missing_declarations = 1; | |
729 | else if (!strcmp (p, "-Wno-missing-declarations")) | |
730 | warn_missing_declarations = 0; | |
51e29401 RS |
731 | else if (!strcmp (p, "-Wredundant-decls")) |
732 | warn_redundant_decls = 1; | |
ec2343c4 | 733 | else if (!strcmp (p, "-Wno-redundant-decls")) |
51e29401 RS |
734 | warn_redundant_decls = 0; |
735 | else if (!strcmp (p, "-Wnested-externs")) | |
736 | warn_nested_externs = 1; | |
737 | else if (!strcmp (p, "-Wno-nested-externs")) | |
738 | warn_nested_externs = 0; | |
739 | else if (!strcmp (p, "-Wtraditional")) | |
740 | warn_traditional = 1; | |
741 | else if (!strcmp (p, "-Wno-traditional")) | |
742 | warn_traditional = 0; | |
743 | else if (!strcmp (p, "-Wformat")) | |
744 | warn_format = 1; | |
745 | else if (!strcmp (p, "-Wno-format")) | |
746 | warn_format = 0; | |
747 | else if (!strcmp (p, "-Wchar-subscripts")) | |
748 | warn_char_subscripts = 1; | |
749 | else if (!strcmp (p, "-Wno-char-subscripts")) | |
750 | warn_char_subscripts = 0; | |
751 | else if (!strcmp (p, "-Wconversion")) | |
752 | warn_conversion = 1; | |
753 | else if (!strcmp (p, "-Wno-conversion")) | |
754 | warn_conversion = 0; | |
755 | else if (!strcmp (p, "-Wparentheses")) | |
756 | warn_parentheses = 1; | |
757 | else if (!strcmp (p, "-Wno-parentheses")) | |
758 | warn_parentheses = 0; | |
57916f61 RS |
759 | else if (!strcmp (p, "-Wreturn-type")) |
760 | warn_return_type = 1; | |
761 | else if (!strcmp (p, "-Wno-return-type")) | |
762 | warn_return_type = 0; | |
51e29401 RS |
763 | else if (!strcmp (p, "-Wcomment")) |
764 | ; /* cpp handles this one. */ | |
765 | else if (!strcmp (p, "-Wno-comment")) | |
766 | ; /* cpp handles this one. */ | |
767 | else if (!strcmp (p, "-Wcomments")) | |
768 | ; /* cpp handles this one. */ | |
769 | else if (!strcmp (p, "-Wno-comments")) | |
770 | ; /* cpp handles this one. */ | |
771 | else if (!strcmp (p, "-Wtrigraphs")) | |
772 | ; /* cpp handles this one. */ | |
773 | else if (!strcmp (p, "-Wno-trigraphs")) | |
774 | ; /* cpp handles this one. */ | |
dab9b3bf RK |
775 | else if (!strcmp (p, "-Wundef")) |
776 | ; /* cpp handles this one. */ | |
777 | else if (!strcmp (p, "-Wno-undef")) | |
778 | ; /* cpp handles this one. */ | |
fc3ffe83 RK |
779 | else if (!strcmp (p, "-Wimport")) |
780 | ; /* cpp handles this one. */ | |
781 | else if (!strcmp (p, "-Wno-import")) | |
782 | ; /* cpp handles this one. */ | |
36e6fa69 RS |
783 | else if (!strcmp (p, "-Wmissing-braces")) |
784 | warn_missing_braces = 1; | |
785 | else if (!strcmp (p, "-Wno-missing-braces")) | |
786 | warn_missing_braces = 0; | |
b8705e61 RK |
787 | else if (!strcmp (p, "-Wmain")) |
788 | warn_main = 1; | |
789 | else if (!strcmp (p, "-Wno-main")) | |
790 | warn_main = 0; | |
d51f9363 JM |
791 | else if (!strcmp (p, "-Wsign-compare")) |
792 | warn_sign_compare = 1; | |
793 | else if (!strcmp (p, "-Wno-sign-compare")) | |
794 | warn_sign_compare = 0; | |
d300e551 NC |
795 | else if (!strcmp (p, "-Wunknown-pragmas")) |
796 | /* Set to greater than 1, so that even unknown pragmas in system | |
797 | headers will be warned about. */ | |
798 | warn_unknown_pragmas = 2; | |
799 | else if (!strcmp (p, "-Wno-unknown-pragmas")) | |
800 | warn_unknown_pragmas = 0; | |
51e29401 RS |
801 | else if (!strcmp (p, "-Wall")) |
802 | { | |
a2468e45 BK |
803 | /* We save the value of warn_uninitialized, since if they put |
804 | -Wuninitialized on the command line, we need to generate a | |
805 | warning about not using it without also specifying -O. */ | |
806 | if (warn_uninitialized != 1) | |
807 | warn_uninitialized = 2; | |
e9a25f70 JL |
808 | warn_implicit_int = 1; |
809 | mesg_implicit_function_declaration = 1; | |
51e29401 RS |
810 | warn_return_type = 1; |
811 | warn_unused = 1; | |
812 | warn_switch = 1; | |
813 | warn_format = 1; | |
814 | warn_char_subscripts = 1; | |
929f3671 | 815 | warn_parentheses = 1; |
36e6fa69 | 816 | warn_missing_braces = 1; |
b8705e61 RK |
817 | /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn |
818 | it off only if it's not explicit. */ | |
819 | warn_main = 2; | |
d300e551 NC |
820 | /* Only warn about unknown pragmas that are not in system headers. */ |
821 | warn_unknown_pragmas = 1; | |
51e29401 RS |
822 | } |
823 | else | |
a0d85b75 | 824 | return strings_processed; |
51e29401 RS |
825 | |
826 | return 1; | |
827 | } | |
828 | ||
829 | /* Hooks for print_node. */ | |
830 | ||
831 | void | |
27d433a2 | 832 | print_lang_decl (file, node, indent) |
d6f4ec51 KG |
833 | FILE *file ATTRIBUTE_UNUSED; |
834 | tree node ATTRIBUTE_UNUSED; | |
835 | int indent ATTRIBUTE_UNUSED; | |
51e29401 RS |
836 | { |
837 | } | |
838 | ||
839 | void | |
27d433a2 | 840 | print_lang_type (file, node, indent) |
d6f4ec51 KG |
841 | FILE *file ATTRIBUTE_UNUSED; |
842 | tree node ATTRIBUTE_UNUSED; | |
843 | int indent ATTRIBUTE_UNUSED; | |
51e29401 RS |
844 | { |
845 | } | |
846 | ||
847 | void | |
848 | print_lang_identifier (file, node, indent) | |
849 | FILE *file; | |
850 | tree node; | |
851 | int indent; | |
852 | { | |
853 | print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4); | |
854 | print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4); | |
855 | print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4); | |
856 | print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4); | |
857 | print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4); | |
fd0b8fce | 858 | print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4); |
51e29401 RS |
859 | } |
860 | \f | |
b4892310 RS |
861 | /* Hook called at end of compilation to assume 1 elt |
862 | for a top-level array decl that wasn't complete before. */ | |
863 | ||
864 | void | |
865 | finish_incomplete_decl (decl) | |
866 | tree decl; | |
867 | { | |
5cfac96e | 868 | if (TREE_CODE (decl) == VAR_DECL) |
b4892310 RS |
869 | { |
870 | tree type = TREE_TYPE (decl); | |
5cfac96e RK |
871 | if (type != error_mark_node |
872 | && TREE_CODE (type) == ARRAY_TYPE | |
873 | && TYPE_DOMAIN (type) == 0) | |
b4892310 | 874 | { |
5cfac96e RK |
875 | if (! DECL_EXTERNAL (decl)) |
876 | warning_with_decl (decl, "array `%s' assumed to have one element"); | |
877 | ||
b4892310 RS |
878 | complete_array_type (type, NULL_TREE, 1); |
879 | ||
880 | layout_decl (decl, 0); | |
881 | } | |
882 | } | |
883 | } | |
884 | \f | |
51e29401 RS |
885 | /* Create a new `struct binding_level'. */ |
886 | ||
887 | static | |
888 | struct binding_level * | |
889 | make_binding_level () | |
890 | { | |
891 | /* NOSTRICT */ | |
892 | return (struct binding_level *) xmalloc (sizeof (struct binding_level)); | |
893 | } | |
894 | ||
895 | /* Nonzero if we are currently in the global binding level. */ | |
896 | ||
897 | int | |
898 | global_bindings_p () | |
899 | { | |
900 | return current_binding_level == global_binding_level; | |
901 | } | |
902 | ||
903 | void | |
904 | keep_next_level () | |
905 | { | |
906 | keep_next_level_flag = 1; | |
907 | } | |
908 | ||
909 | /* Nonzero if the current level needs to have a BLOCK made. */ | |
910 | ||
911 | int | |
912 | kept_level_p () | |
913 | { | |
914 | return ((current_binding_level->keep_if_subblocks | |
915 | && current_binding_level->blocks != 0) | |
916 | || current_binding_level->keep | |
917 | || current_binding_level->names != 0 | |
918 | || (current_binding_level->tags != 0 | |
919 | && !current_binding_level->tag_transparent)); | |
920 | } | |
921 | ||
922 | /* Identify this binding level as a level of parameters. | |
89d7540d RS |
923 | DEFINITION_FLAG is 1 for a definition, 0 for a declaration. |
924 | But it turns out there is no way to pass the right value for | |
925 | DEFINITION_FLAG, so we ignore it. */ | |
51e29401 RS |
926 | |
927 | void | |
928 | declare_parm_level (definition_flag) | |
929 | int definition_flag; | |
930 | { | |
89d7540d | 931 | current_binding_level->parm_flag = 1; |
51e29401 RS |
932 | } |
933 | ||
934 | /* Nonzero if currently making parm declarations. */ | |
935 | ||
936 | int | |
937 | in_parm_level_p () | |
938 | { | |
939 | return current_binding_level->parm_flag; | |
940 | } | |
941 | ||
942 | /* Enter a new binding level. | |
943 | If TAG_TRANSPARENT is nonzero, do so only for the name space of variables, | |
944 | not for that of tags. */ | |
945 | ||
946 | void | |
947 | pushlevel (tag_transparent) | |
948 | int tag_transparent; | |
949 | { | |
950 | register struct binding_level *newlevel = NULL_BINDING_LEVEL; | |
951 | ||
952 | /* If this is the top level of a function, | |
953 | just make sure that NAMED_LABELS is 0. */ | |
954 | ||
955 | if (current_binding_level == global_binding_level) | |
956 | { | |
957 | named_labels = 0; | |
958 | } | |
959 | ||
960 | /* Reuse or create a struct for this binding level. */ | |
961 | ||
962 | if (free_binding_level) | |
963 | { | |
964 | newlevel = free_binding_level; | |
965 | free_binding_level = free_binding_level->level_chain; | |
966 | } | |
967 | else | |
968 | { | |
969 | newlevel = make_binding_level (); | |
970 | } | |
971 | ||
972 | /* Add this level to the front of the chain (stack) of levels that | |
973 | are active. */ | |
974 | ||
975 | *newlevel = clear_binding_level; | |
976 | newlevel->tag_transparent | |
977 | = (tag_transparent | |
978 | || (current_binding_level | |
979 | ? current_binding_level->subblocks_tag_transparent | |
980 | : 0)); | |
981 | newlevel->level_chain = current_binding_level; | |
982 | current_binding_level = newlevel; | |
983 | newlevel->keep = keep_next_level_flag; | |
984 | keep_next_level_flag = 0; | |
985 | newlevel->keep_if_subblocks = keep_next_if_subblocks; | |
986 | keep_next_if_subblocks = 0; | |
987 | } | |
988 | ||
0500d6f9 RK |
989 | /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */ |
990 | ||
991 | static void | |
992 | clear_limbo_values (block) | |
993 | tree block; | |
994 | { | |
995 | tree tem; | |
996 | ||
997 | for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem)) | |
998 | if (DECL_NAME (tem) != 0) | |
999 | IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0; | |
1000 | ||
1001 | for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem)) | |
1002 | clear_limbo_values (tem); | |
1003 | } | |
1004 | ||
51e29401 RS |
1005 | /* Exit a binding level. |
1006 | Pop the level off, and restore the state of the identifier-decl mappings | |
1007 | that were in effect when this level was entered. | |
1008 | ||
1009 | If KEEP is nonzero, this level had explicit declarations, so | |
1010 | and create a "block" (a BLOCK node) for the level | |
1011 | to record its declarations and subblocks for symbol table output. | |
1012 | ||
1013 | If FUNCTIONBODY is nonzero, this level is the body of a function, | |
1014 | so create a block as if KEEP were set and also clear out all | |
1015 | label names. | |
1016 | ||
1017 | If REVERSE is nonzero, reverse the order of decls before putting | |
1018 | them into the BLOCK. */ | |
1019 | ||
1020 | tree | |
1021 | poplevel (keep, reverse, functionbody) | |
1022 | int keep; | |
1023 | int reverse; | |
1024 | int functionbody; | |
1025 | { | |
1026 | register tree link; | |
1027 | /* The chain of decls was accumulated in reverse order. | |
1028 | Put it into forward order, just for cleanliness. */ | |
1029 | tree decls; | |
1030 | tree tags = current_binding_level->tags; | |
1031 | tree subblocks = current_binding_level->blocks; | |
1032 | tree block = 0; | |
1033 | tree decl; | |
968e5643 | 1034 | int block_previously_created; |
51e29401 RS |
1035 | |
1036 | keep |= current_binding_level->keep; | |
1037 | ||
1038 | /* This warning is turned off because it causes warnings for | |
1039 | declarations like `extern struct foo *x'. */ | |
1040 | #if 0 | |
1041 | /* Warn about incomplete structure types in this level. */ | |
1042 | for (link = tags; link; link = TREE_CHAIN (link)) | |
1043 | if (TYPE_SIZE (TREE_VALUE (link)) == 0) | |
1044 | { | |
1045 | tree type = TREE_VALUE (link); | |
1046 | char *errmsg; | |
1047 | switch (TREE_CODE (type)) | |
1048 | { | |
1049 | case RECORD_TYPE: | |
1050 | errmsg = "`struct %s' incomplete in scope ending here"; | |
1051 | break; | |
1052 | case UNION_TYPE: | |
1053 | errmsg = "`union %s' incomplete in scope ending here"; | |
1054 | break; | |
1055 | case ENUMERAL_TYPE: | |
1056 | errmsg = "`enum %s' incomplete in scope ending here"; | |
1057 | break; | |
1058 | } | |
1059 | if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
1060 | error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type))); | |
1061 | else | |
1062 | /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */ | |
1063 | error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)))); | |
1064 | } | |
1065 | #endif /* 0 */ | |
1066 | ||
1067 | /* Get the decls in the order they were written. | |
1068 | Usually current_binding_level->names is in reverse order. | |
1069 | But parameter decls were previously put in forward order. */ | |
1070 | ||
1071 | if (reverse) | |
1072 | current_binding_level->names | |
1073 | = decls = nreverse (current_binding_level->names); | |
1074 | else | |
1075 | decls = current_binding_level->names; | |
1076 | ||
1077 | /* Output any nested inline functions within this block | |
1078 | if they weren't already output. */ | |
1079 | ||
1080 | for (decl = decls; decl; decl = TREE_CHAIN (decl)) | |
1081 | if (TREE_CODE (decl) == FUNCTION_DECL | |
1082 | && ! TREE_ASM_WRITTEN (decl) | |
1083 | && DECL_INITIAL (decl) != 0 | |
1084 | && TREE_ADDRESSABLE (decl)) | |
42dfa47f RS |
1085 | { |
1086 | /* If this decl was copied from a file-scope decl | |
1087 | on account of a block-scope extern decl, | |
6272a449 JW |
1088 | propagate TREE_ADDRESSABLE to the file-scope decl. |
1089 | ||
1090 | DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is | |
1091 | true, since then the decl goes through save_for_inline_copying. */ | |
1092 | if (DECL_ABSTRACT_ORIGIN (decl) != 0 | |
1093 | && DECL_ABSTRACT_ORIGIN (decl) != decl) | |
42dfa47f | 1094 | TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1; |
dd103803 | 1095 | else if (DECL_SAVED_INSNS (decl) != 0) |
47df0262 RK |
1096 | { |
1097 | push_function_context (); | |
1098 | output_inline_function (decl); | |
1099 | pop_function_context (); | |
1100 | } | |
42dfa47f | 1101 | } |
51e29401 RS |
1102 | |
1103 | /* If there were any declarations or structure tags in that level, | |
1104 | or if this level is a function body, | |
1105 | create a BLOCK to record them for the life of this function. */ | |
1106 | ||
3bf40d18 | 1107 | block = 0; |
968e5643 RS |
1108 | block_previously_created = (current_binding_level->this_block != 0); |
1109 | if (block_previously_created) | |
3bf40d18 RS |
1110 | block = current_binding_level->this_block; |
1111 | else if (keep || functionbody | |
1112 | || (current_binding_level->keep_if_subblocks && subblocks != 0)) | |
1113 | block = make_node (BLOCK); | |
1114 | if (block != 0) | |
1115 | { | |
1116 | BLOCK_VARS (block) = decls; | |
1117 | BLOCK_TYPE_TAGS (block) = tags; | |
1118 | BLOCK_SUBBLOCKS (block) = subblocks; | |
4ecc65ac | 1119 | remember_end_note (block); |
3bf40d18 | 1120 | } |
51e29401 RS |
1121 | |
1122 | /* In each subblock, record that this is its superior. */ | |
1123 | ||
1124 | for (link = subblocks; link; link = TREE_CHAIN (link)) | |
1125 | BLOCK_SUPERCONTEXT (link) = block; | |
1126 | ||
1127 | /* Clear out the meanings of the local variables of this level. */ | |
1128 | ||
1129 | for (link = decls; link; link = TREE_CHAIN (link)) | |
1130 | { | |
1131 | if (DECL_NAME (link) != 0) | |
1132 | { | |
1133 | /* If the ident. was used or addressed via a local extern decl, | |
1134 | don't forget that fact. */ | |
1394aabd | 1135 | if (DECL_EXTERNAL (link)) |
51e29401 RS |
1136 | { |
1137 | if (TREE_USED (link)) | |
1138 | TREE_USED (DECL_NAME (link)) = 1; | |
1139 | if (TREE_ADDRESSABLE (link)) | |
1140 | TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1; | |
1141 | } | |
1142 | IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0; | |
1143 | } | |
1144 | } | |
1145 | ||
1146 | /* Restore all name-meanings of the outer levels | |
1147 | that were shadowed by this level. */ | |
1148 | ||
1149 | for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link)) | |
1150 | IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link); | |
1151 | ||
1152 | /* If the level being exited is the top level of a function, | |
1153 | check over all the labels, and clear out the current | |
1154 | (function local) meanings of their names. */ | |
1155 | ||
1156 | if (functionbody) | |
1157 | { | |
0500d6f9 RK |
1158 | clear_limbo_values (block); |
1159 | ||
51e29401 RS |
1160 | /* If this is the top level block of a function, |
1161 | the vars are the function's parameters. | |
1162 | Don't leave them in the BLOCK because they are | |
1163 | found in the FUNCTION_DECL instead. */ | |
1164 | ||
1165 | BLOCK_VARS (block) = 0; | |
1166 | ||
1167 | /* Clear out the definitions of all label names, | |
1168 | since their scopes end here, | |
1169 | and add them to BLOCK_VARS. */ | |
1170 | ||
1171 | for (link = named_labels; link; link = TREE_CHAIN (link)) | |
1172 | { | |
1173 | register tree label = TREE_VALUE (link); | |
1174 | ||
1175 | if (DECL_INITIAL (label) == 0) | |
1176 | { | |
1177 | error_with_decl (label, "label `%s' used but not defined"); | |
1178 | /* Avoid crashing later. */ | |
1179 | define_label (input_filename, lineno, | |
1180 | DECL_NAME (label)); | |
1181 | } | |
1182 | else if (warn_unused && !TREE_USED (label)) | |
1183 | warning_with_decl (label, "label `%s' defined but not used"); | |
1184 | IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0; | |
1185 | ||
1186 | /* Put the labels into the "variables" of the | |
1187 | top-level block, so debugger can see them. */ | |
1188 | TREE_CHAIN (label) = BLOCK_VARS (block); | |
1189 | BLOCK_VARS (block) = label; | |
1190 | } | |
1191 | } | |
1192 | ||
1193 | /* Pop the current level, and free the structure for reuse. */ | |
1194 | ||
1195 | { | |
1196 | register struct binding_level *level = current_binding_level; | |
1197 | current_binding_level = current_binding_level->level_chain; | |
1198 | ||
1199 | level->level_chain = free_binding_level; | |
1200 | free_binding_level = level; | |
1201 | } | |
1202 | ||
1203 | /* Dispose of the block that we just made inside some higher level. */ | |
1204 | if (functionbody) | |
1205 | DECL_INITIAL (current_function_decl) = block; | |
1206 | else if (block) | |
968e5643 RS |
1207 | { |
1208 | if (!block_previously_created) | |
1209 | current_binding_level->blocks | |
1210 | = chainon (current_binding_level->blocks, block); | |
1211 | } | |
51e29401 RS |
1212 | /* If we did not make a block for the level just exited, |
1213 | any blocks made for inner levels | |
1214 | (since they cannot be recorded as subblocks in that level) | |
1215 | must be carried forward so they will later become subblocks | |
1216 | of something else. */ | |
1217 | else if (subblocks) | |
1218 | current_binding_level->blocks | |
1219 | = chainon (current_binding_level->blocks, subblocks); | |
1220 | ||
1221 | /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this | |
1222 | binding contour so that they point to the appropriate construct, i.e. | |
1223 | either to the current FUNCTION_DECL node, or else to the BLOCK node | |
1224 | we just constructed. | |
1225 | ||
1226 | Note that for tagged types whose scope is just the formal parameter | |
1227 | list for some function type specification, we can't properly set | |
1228 | their TYPE_CONTEXTs here, because we don't have a pointer to the | |
1229 | appropriate FUNCTION_TYPE node readily available to us. For those | |
1230 | cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set | |
1231 | in `grokdeclarator' as soon as we have created the FUNCTION_TYPE | |
1232 | node which will represent the "scope" for these "parameter list local" | |
1233 | tagged types. | |
1234 | */ | |
1235 | ||
1236 | if (functionbody) | |
1237 | for (link = tags; link; link = TREE_CHAIN (link)) | |
1238 | TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl; | |
1239 | else if (block) | |
1240 | for (link = tags; link; link = TREE_CHAIN (link)) | |
1241 | TYPE_CONTEXT (TREE_VALUE (link)) = block; | |
1242 | ||
1243 | if (block) | |
1244 | TREE_USED (block) = 1; | |
1245 | return block; | |
1246 | } | |
3bf40d18 RS |
1247 | |
1248 | /* Delete the node BLOCK from the current binding level. | |
1249 | This is used for the block inside a stmt expr ({...}) | |
1250 | so that the block can be reinserted where appropriate. */ | |
1251 | ||
1252 | void | |
1253 | delete_block (block) | |
1254 | tree block; | |
1255 | { | |
1256 | tree t; | |
1257 | if (current_binding_level->blocks == block) | |
1258 | current_binding_level->blocks = TREE_CHAIN (block); | |
1259 | for (t = current_binding_level->blocks; t;) | |
1260 | { | |
1261 | if (TREE_CHAIN (t) == block) | |
1262 | TREE_CHAIN (t) = TREE_CHAIN (block); | |
1263 | else | |
1264 | t = TREE_CHAIN (t); | |
1265 | } | |
1266 | TREE_CHAIN (block) = NULL; | |
1267 | /* Clear TREE_USED which is always set by poplevel. | |
1268 | The flag is set again if insert_block is called. */ | |
1269 | TREE_USED (block) = 0; | |
1270 | } | |
1271 | ||
1272 | /* Insert BLOCK at the end of the list of subblocks of the | |
1273 | current binding level. This is used when a BIND_EXPR is expanded, | |
6f65afb0 | 1274 | to handle the BLOCK node inside the BIND_EXPR. */ |
3bf40d18 RS |
1275 | |
1276 | void | |
1277 | insert_block (block) | |
1278 | tree block; | |
1279 | { | |
1280 | TREE_USED (block) = 1; | |
1281 | current_binding_level->blocks | |
1282 | = chainon (current_binding_level->blocks, block); | |
1283 | } | |
1284 | ||
968e5643 | 1285 | /* Set the BLOCK node for the innermost scope |
3bf40d18 RS |
1286 | (the one we are currently in). */ |
1287 | ||
968e5643 RS |
1288 | void |
1289 | set_block (block) | |
1290 | register tree block; | |
3bf40d18 | 1291 | { |
968e5643 | 1292 | current_binding_level->this_block = block; |
3bf40d18 | 1293 | } |
51e29401 RS |
1294 | \f |
1295 | void | |
1296 | push_label_level () | |
1297 | { | |
1298 | register struct binding_level *newlevel; | |
1299 | ||
1300 | /* Reuse or create a struct for this binding level. */ | |
1301 | ||
1302 | if (free_binding_level) | |
1303 | { | |
1304 | newlevel = free_binding_level; | |
1305 | free_binding_level = free_binding_level->level_chain; | |
1306 | } | |
1307 | else | |
1308 | { | |
1309 | newlevel = make_binding_level (); | |
1310 | } | |
1311 | ||
1312 | /* Add this level to the front of the chain (stack) of label levels. */ | |
1313 | ||
1314 | newlevel->level_chain = label_level_chain; | |
1315 | label_level_chain = newlevel; | |
1316 | ||
1317 | newlevel->names = named_labels; | |
1318 | newlevel->shadowed = shadowed_labels; | |
1319 | named_labels = 0; | |
1320 | shadowed_labels = 0; | |
1321 | } | |
1322 | ||
1323 | void | |
1324 | pop_label_level () | |
1325 | { | |
1326 | register struct binding_level *level = label_level_chain; | |
1327 | tree link, prev; | |
1328 | ||
1329 | /* Clear out the definitions of the declared labels in this level. | |
1330 | Leave in the list any ordinary, non-declared labels. */ | |
1331 | for (link = named_labels, prev = 0; link;) | |
1332 | { | |
1333 | if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link))) | |
1334 | { | |
1335 | if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0) | |
1336 | { | |
6b2a374b RK |
1337 | error_with_decl (TREE_VALUE (link), |
1338 | "label `%s' used but not defined"); | |
51e29401 RS |
1339 | /* Avoid crashing later. */ |
1340 | define_label (input_filename, lineno, | |
1341 | DECL_NAME (TREE_VALUE (link))); | |
1342 | } | |
1343 | else if (warn_unused && !TREE_USED (TREE_VALUE (link))) | |
1344 | warning_with_decl (TREE_VALUE (link), | |
1345 | "label `%s' defined but not used"); | |
1346 | IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0; | |
1347 | ||
1348 | /* Delete this element from the list. */ | |
1349 | link = TREE_CHAIN (link); | |
1350 | if (prev) | |
1351 | TREE_CHAIN (prev) = link; | |
1352 | else | |
1353 | named_labels = link; | |
1354 | } | |
1355 | else | |
1356 | { | |
1357 | prev = link; | |
1358 | link = TREE_CHAIN (link); | |
1359 | } | |
1360 | } | |
1361 | ||
1362 | /* Bring back all the labels that were shadowed. */ | |
1363 | for (link = shadowed_labels; link; link = TREE_CHAIN (link)) | |
1364 | if (DECL_NAME (TREE_VALUE (link)) != 0) | |
1365 | IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) | |
1366 | = TREE_VALUE (link); | |
1367 | ||
1368 | named_labels = chainon (named_labels, level->names); | |
1369 | shadowed_labels = level->shadowed; | |
1370 | ||
1371 | /* Pop the current level, and free the structure for reuse. */ | |
1372 | label_level_chain = label_level_chain->level_chain; | |
1373 | level->level_chain = free_binding_level; | |
1374 | free_binding_level = level; | |
1375 | } | |
1376 | \f | |
1377 | /* Push a definition or a declaration of struct, union or enum tag "name". | |
1378 | "type" should be the type node. | |
1379 | We assume that the tag "name" is not already defined. | |
1380 | ||
1381 | Note that the definition may really be just a forward reference. | |
1382 | In that case, the TYPE_SIZE will be zero. */ | |
1383 | ||
1384 | void | |
1385 | pushtag (name, type) | |
1386 | tree name, type; | |
1387 | { | |
1388 | register struct binding_level *b; | |
1389 | ||
1390 | /* Find the proper binding level for this type tag. */ | |
1391 | ||
1392 | for (b = current_binding_level; b->tag_transparent; b = b->level_chain) | |
1393 | continue; | |
1394 | ||
1395 | if (name) | |
1396 | { | |
1397 | /* Record the identifier as the type's name if it has none. */ | |
1398 | ||
1399 | if (TYPE_NAME (type) == 0) | |
1400 | TYPE_NAME (type) = name; | |
51e29401 RS |
1401 | } |
1402 | ||
c138f328 RS |
1403 | if (b == global_binding_level) |
1404 | b->tags = perm_tree_cons (name, type, b->tags); | |
1405 | else | |
1406 | b->tags = saveable_tree_cons (name, type, b->tags); | |
1407 | ||
51e29401 RS |
1408 | /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the |
1409 | tagged type we just added to the current binding level. This fake | |
1410 | NULL-named TYPE_DECL node helps dwarfout.c to know when it needs | |
858a47b1 | 1411 | to output a representation of a tagged type, and it also gives |
51e29401 RS |
1412 | us a convenient place to record the "scope start" address for the |
1413 | tagged type. */ | |
1414 | ||
8d9bfdc5 | 1415 | TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type)); |
88dad228 JM |
1416 | |
1417 | /* An approximation for now, so we can tell this is a function-scope tag. | |
1418 | This will be updated in poplevel. */ | |
1419 | TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type)); | |
51e29401 RS |
1420 | } |
1421 | \f | |
1422 | /* Handle when a new declaration NEWDECL | |
1423 | has the same name as an old one OLDDECL | |
1424 | in the same binding contour. | |
1425 | Prints an error message if appropriate. | |
1426 | ||
1427 | If safely possible, alter OLDDECL to look like NEWDECL, and return 1. | |
bf44f7de JW |
1428 | Otherwise, return 0. |
1429 | ||
1430 | When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration, | |
1431 | and OLDDECL is in an outer binding level and should thus not be changed. */ | |
51e29401 RS |
1432 | |
1433 | static int | |
bf44f7de | 1434 | duplicate_decls (newdecl, olddecl, different_binding_level) |
51e29401 | 1435 | register tree newdecl, olddecl; |
bf44f7de | 1436 | int different_binding_level; |
51e29401 RS |
1437 | { |
1438 | int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl)); | |
1439 | int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL | |
1440 | && DECL_INITIAL (newdecl) != 0); | |
664b4b1e RS |
1441 | tree oldtype = TREE_TYPE (olddecl); |
1442 | tree newtype = TREE_TYPE (newdecl); | |
8e5e53da | 1443 | char *errmsg = 0; |
51e29401 | 1444 | |
4b4e3407 | 1445 | if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd') |
d9525bec BK |
1446 | DECL_MACHINE_ATTRIBUTES (newdecl) |
1447 | = merge_machine_decl_attributes (olddecl, newdecl); | |
4b4e3407 | 1448 | |
664b4b1e RS |
1449 | if (TREE_CODE (newtype) == ERROR_MARK |
1450 | || TREE_CODE (oldtype) == ERROR_MARK) | |
51e29401 RS |
1451 | types_match = 0; |
1452 | ||
1453 | /* New decl is completely inconsistent with the old one => | |
1454 | tell caller to replace the old one. | |
1455 | This is always an error except in the case of shadowing a builtin. */ | |
1456 | if (TREE_CODE (olddecl) != TREE_CODE (newdecl)) | |
1457 | { | |
1458 | if (TREE_CODE (olddecl) == FUNCTION_DECL | |
70efc776 RS |
1459 | && (DECL_BUILT_IN (olddecl) |
1460 | || DECL_BUILT_IN_NONANSI (olddecl))) | |
51e29401 | 1461 | { |
70efc776 RS |
1462 | /* If you declare a built-in or predefined function name as static, |
1463 | the old definition is overridden, | |
51e29401 RS |
1464 | but optionally warn this was a bad choice of name. */ |
1465 | if (!TREE_PUBLIC (newdecl)) | |
1466 | { | |
70efc776 RS |
1467 | if (!warn_shadow) |
1468 | ; | |
1469 | else if (DECL_BUILT_IN (olddecl)) | |
51e29401 | 1470 | warning_with_decl (newdecl, "shadowing built-in function `%s'"); |
70efc776 RS |
1471 | else |
1472 | warning_with_decl (newdecl, "shadowing library function `%s'"); | |
51e29401 RS |
1473 | } |
1474 | /* Likewise, if the built-in is not ansi, then programs can | |
929f3671 | 1475 | override it even globally without an error. */ |
70efc776 RS |
1476 | else if (! DECL_BUILT_IN (olddecl)) |
1477 | warning_with_decl (newdecl, | |
1478 | "library function `%s' declared as non-function"); | |
1479 | ||
51e29401 RS |
1480 | else if (DECL_BUILT_IN_NONANSI (olddecl)) |
1481 | warning_with_decl (newdecl, | |
1482 | "built-in function `%s' declared as non-function"); | |
51e29401 RS |
1483 | else |
1484 | warning_with_decl (newdecl, | |
70efc776 | 1485 | "built-in function `%s' declared as non-function"); |
51e29401 RS |
1486 | } |
1487 | else | |
1488 | { | |
1489 | error_with_decl (newdecl, "`%s' redeclared as different kind of symbol"); | |
1490 | error_with_decl (olddecl, "previous declaration of `%s'"); | |
1491 | } | |
1492 | ||
1493 | return 0; | |
1494 | } | |
1495 | ||
1496 | /* For real parm decl following a forward decl, | |
1497 | return 1 so old decl will be reused. */ | |
1498 | if (types_match && TREE_CODE (newdecl) == PARM_DECL | |
1499 | && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl)) | |
1500 | return 1; | |
1501 | ||
1502 | /* The new declaration is the same kind of object as the old one. | |
1503 | The declarations may partially match. Print warnings if they don't | |
1504 | match enough. Ultimately, copy most of the information from the new | |
1505 | decl to the old one, and keep using the old one. */ | |
1506 | ||
1507 | if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL | |
1508 | && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl | |
1509 | && DECL_INITIAL (olddecl) == 0) | |
1510 | /* If -traditional, avoid error for redeclaring fcn | |
1511 | after implicit decl. */ | |
1512 | ; | |
1513 | else if (TREE_CODE (olddecl) == FUNCTION_DECL | |
1514 | && DECL_BUILT_IN (olddecl)) | |
1515 | { | |
e841f997 | 1516 | /* A function declaration for a built-in function. */ |
51e29401 RS |
1517 | if (!TREE_PUBLIC (newdecl)) |
1518 | { | |
1519 | /* If you declare a built-in function name as static, the | |
1520 | built-in definition is overridden, | |
1521 | but optionally warn this was a bad choice of name. */ | |
1522 | if (warn_shadow) | |
1523 | warning_with_decl (newdecl, "shadowing built-in function `%s'"); | |
1524 | /* Discard the old built-in function. */ | |
1525 | return 0; | |
1526 | } | |
1527 | else if (!types_match) | |
4c41bbfa RS |
1528 | { |
1529 | /* Accept the return type of the new declaration if same modes. */ | |
bf44f7de JW |
1530 | tree oldreturntype = TREE_TYPE (oldtype); |
1531 | tree newreturntype = TREE_TYPE (newtype); | |
4fc7cf69 JW |
1532 | |
1533 | /* Make sure we put the new type in the same obstack as the old ones. | |
1534 | If the old types are not both in the same obstack, use the | |
1535 | permanent one. */ | |
1536 | if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype)) | |
1537 | push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype)); | |
1538 | else | |
1539 | { | |
1540 | push_obstacks_nochange (); | |
1541 | end_temporary_allocation (); | |
1542 | } | |
1543 | ||
4c41bbfa RS |
1544 | if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype)) |
1545 | { | |
32436219 RS |
1546 | /* Function types may be shared, so we can't just modify |
1547 | the return type of olddecl's function type. */ | |
bf44f7de | 1548 | tree trytype |
32436219 | 1549 | = build_function_type (newreturntype, |
bf44f7de | 1550 | TYPE_ARG_TYPES (oldtype)); |
32436219 | 1551 | |
bf44f7de | 1552 | types_match = comptypes (newtype, trytype); |
1f7586c1 | 1553 | if (types_match) |
bf44f7de | 1554 | oldtype = trytype; |
1f7586c1 RS |
1555 | } |
1556 | /* Accept harmless mismatch in first argument type also. | |
1557 | This is for ffs. */ | |
1558 | if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0 | |
bf44f7de JW |
1559 | && TYPE_ARG_TYPES (oldtype) != 0 |
1560 | && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0 | |
1561 | && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0 | |
1562 | && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype))) | |
1563 | == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype))))) | |
1f7586c1 RS |
1564 | { |
1565 | /* Function types may be shared, so we can't just modify | |
1566 | the return type of olddecl's function type. */ | |
bf44f7de JW |
1567 | tree trytype |
1568 | = build_function_type (TREE_TYPE (oldtype), | |
1f7586c1 | 1569 | tree_cons (NULL_TREE, |
bf44f7de JW |
1570 | TREE_VALUE (TYPE_ARG_TYPES (newtype)), |
1571 | TREE_CHAIN (TYPE_ARG_TYPES (oldtype)))); | |
1f7586c1 | 1572 | |
bf44f7de | 1573 | types_match = comptypes (newtype, trytype); |
32436219 | 1574 | if (types_match) |
bf44f7de | 1575 | oldtype = trytype; |
4c41bbfa | 1576 | } |
bf44f7de JW |
1577 | if (! different_binding_level) |
1578 | TREE_TYPE (olddecl) = oldtype; | |
4fc7cf69 JW |
1579 | |
1580 | pop_obstacks (); | |
4c41bbfa RS |
1581 | } |
1582 | if (!types_match) | |
52b6a22f RS |
1583 | { |
1584 | /* If types don't match for a built-in, throw away the built-in. */ | |
1585 | warning_with_decl (newdecl, "conflicting types for built-in function `%s'"); | |
1586 | return 0; | |
1587 | } | |
51e29401 RS |
1588 | } |
1589 | else if (TREE_CODE (olddecl) == FUNCTION_DECL | |
e841f997 | 1590 | && DECL_SOURCE_LINE (olddecl) == 0) |
51e29401 | 1591 | { |
e841f997 RS |
1592 | /* A function declaration for a predeclared function |
1593 | that isn't actually built in. */ | |
51e29401 RS |
1594 | if (!TREE_PUBLIC (newdecl)) |
1595 | { | |
858a47b1 | 1596 | /* If you declare it as static, the |
e841f997 | 1597 | default definition is overridden. */ |
51e29401 RS |
1598 | return 0; |
1599 | } | |
1600 | else if (!types_match) | |
e841f997 | 1601 | { |
4d06f145 RS |
1602 | /* If the types don't match, preserve volatility indication. |
1603 | Later on, we will discard everything else about the | |
1604 | default declaration. */ | |
e841f997 | 1605 | TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl); |
e841f997 | 1606 | } |
51e29401 | 1607 | } |
592252ad RS |
1608 | /* Permit char *foo () to match void *foo (...) if not pedantic, |
1609 | if one of them came from a system header file. */ | |
a4219ac7 RS |
1610 | else if (!types_match |
1611 | && TREE_CODE (olddecl) == FUNCTION_DECL | |
1612 | && TREE_CODE (newdecl) == FUNCTION_DECL | |
664b4b1e RS |
1613 | && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE |
1614 | && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE | |
592252ad RS |
1615 | && (DECL_IN_SYSTEM_HEADER (olddecl) |
1616 | || DECL_IN_SYSTEM_HEADER (newdecl)) | |
5fe86b8b | 1617 | && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node |
664b4b1e RS |
1618 | && TYPE_ARG_TYPES (oldtype) == 0 |
1619 | && self_promoting_args_p (TYPE_ARG_TYPES (newtype)) | |
1620 | && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node) | |
a4219ac7 | 1621 | || |
664b4b1e RS |
1622 | (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node |
1623 | && TYPE_ARG_TYPES (newtype) == 0 | |
1624 | && self_promoting_args_p (TYPE_ARG_TYPES (oldtype)) | |
5fe86b8b | 1625 | && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node))) |
a4219ac7 RS |
1626 | { |
1627 | if (pedantic) | |
1628 | pedwarn_with_decl (newdecl, "conflicting types for `%s'"); | |
664b4b1e | 1629 | /* Make sure we keep void * as ret type, not char *. */ |
5fe86b8b | 1630 | if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node) |
664b4b1e | 1631 | TREE_TYPE (newdecl) = newtype = oldtype; |
1d00bef8 JW |
1632 | |
1633 | /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration | |
1634 | we will come back here again. */ | |
1635 | DECL_IN_SYSTEM_HEADER (newdecl) = 1; | |
a4219ac7 | 1636 | } |
51e29401 RS |
1637 | else if (!types_match |
1638 | /* Permit char *foo (int, ...); followed by char *foo (); | |
1639 | if not pedantic. */ | |
1640 | && ! (TREE_CODE (olddecl) == FUNCTION_DECL | |
1641 | && ! pedantic | |
1642 | /* Return types must still match. */ | |
664b4b1e RS |
1643 | && comptypes (TREE_TYPE (oldtype), |
1644 | TREE_TYPE (newtype)) | |
1645 | && TYPE_ARG_TYPES (newtype) == 0)) | |
51e29401 RS |
1646 | { |
1647 | error_with_decl (newdecl, "conflicting types for `%s'"); | |
1648 | /* Check for function type mismatch | |
1649 | involving an empty arglist vs a nonempty one. */ | |
1650 | if (TREE_CODE (olddecl) == FUNCTION_DECL | |
664b4b1e RS |
1651 | && comptypes (TREE_TYPE (oldtype), |
1652 | TREE_TYPE (newtype)) | |
1653 | && ((TYPE_ARG_TYPES (oldtype) == 0 | |
51e29401 RS |
1654 | && DECL_INITIAL (olddecl) == 0) |
1655 | || | |
664b4b1e | 1656 | (TYPE_ARG_TYPES (newtype) == 0 |
51e29401 RS |
1657 | && DECL_INITIAL (newdecl) == 0))) |
1658 | { | |
1659 | /* Classify the problem further. */ | |
664b4b1e | 1660 | register tree t = TYPE_ARG_TYPES (oldtype); |
51e29401 | 1661 | if (t == 0) |
664b4b1e | 1662 | t = TYPE_ARG_TYPES (newtype); |
51e29401 RS |
1663 | for (; t; t = TREE_CHAIN (t)) |
1664 | { | |
1665 | register tree type = TREE_VALUE (t); | |
1666 | ||
5fe86b8b RS |
1667 | if (TREE_CHAIN (t) == 0 |
1668 | && TYPE_MAIN_VARIANT (type) != void_type_node) | |
51e29401 RS |
1669 | { |
1670 | error ("A parameter list with an ellipsis can't match"); | |
1671 | error ("an empty parameter name list declaration."); | |
1672 | break; | |
1673 | } | |
1674 | ||
90d56da8 | 1675 | if (TYPE_MAIN_VARIANT (type) == float_type_node |
24bc4c7f | 1676 | || C_PROMOTING_INTEGER_TYPE_P (type)) |
51e29401 RS |
1677 | { |
1678 | error ("An argument type that has a default promotion"); | |
1679 | error ("can't match an empty parameter name list declaration."); | |
1680 | break; | |
1681 | } | |
1682 | } | |
1683 | } | |
1684 | error_with_decl (olddecl, "previous declaration of `%s'"); | |
1685 | } | |
1686 | else | |
1687 | { | |
8e5e53da | 1688 | errmsg = redeclaration_error_message (newdecl, olddecl); |
51e29401 RS |
1689 | if (errmsg) |
1690 | { | |
1691 | error_with_decl (newdecl, errmsg); | |
1692 | error_with_decl (olddecl, | |
d847e6a7 RS |
1693 | ((DECL_INITIAL (olddecl) |
1694 | && current_binding_level == global_binding_level) | |
1695 | ? "`%s' previously defined here" | |
1696 | : "`%s' previously declared here")); | |
51e29401 | 1697 | } |
4b4e3407 RK |
1698 | else if (TREE_CODE (newdecl) == TYPE_DECL |
1699 | && (DECL_IN_SYSTEM_HEADER (olddecl) | |
1700 | || DECL_IN_SYSTEM_HEADER (newdecl))) | |
1701 | { | |
1702 | warning_with_decl (newdecl, "redefinition of `%s'"); | |
1703 | warning_with_decl | |
1704 | (olddecl, | |
1705 | ((DECL_INITIAL (olddecl) | |
1706 | && current_binding_level == global_binding_level) | |
1707 | ? "`%s' previously defined here" | |
1708 | : "`%s' previously declared here")); | |
1709 | } | |
51e29401 RS |
1710 | else if (TREE_CODE (olddecl) == FUNCTION_DECL |
1711 | && DECL_INITIAL (olddecl) != 0 | |
664b4b1e | 1712 | && TYPE_ARG_TYPES (oldtype) == 0 |
f5ec0026 RK |
1713 | && TYPE_ARG_TYPES (newtype) != 0 |
1714 | && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0) | |
51e29401 RS |
1715 | { |
1716 | register tree type, parm; | |
1717 | register int nargs; | |
1718 | /* Prototype decl follows defn w/o prototype. */ | |
1719 | ||
664b4b1e RS |
1720 | for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype), |
1721 | type = TYPE_ARG_TYPES (newtype), | |
51e29401 | 1722 | nargs = 1; |
5fe86b8b RS |
1723 | (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node |
1724 | || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node); | |
51e29401 RS |
1725 | parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++) |
1726 | { | |
5fe86b8b RS |
1727 | if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node |
1728 | || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node) | |
51e29401 RS |
1729 | { |
1730 | errmsg = "prototype for `%s' follows and number of arguments"; | |
1731 | break; | |
1732 | } | |
1733 | /* Type for passing arg must be consistent | |
1734 | with that declared for the arg. */ | |
1735 | if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type)) | |
1736 | /* If -traditional, allow `unsigned int' instead of `int' | |
1737 | in the prototype. */ | |
1738 | && (! (flag_traditional | |
90d56da8 RS |
1739 | && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node |
1740 | && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))) | |
51e29401 RS |
1741 | { |
1742 | errmsg = "prototype for `%s' follows and argument %d"; | |
1743 | break; | |
1744 | } | |
1745 | } | |
1746 | if (errmsg) | |
1747 | { | |
1748 | error_with_decl (newdecl, errmsg, nargs); | |
1749 | error_with_decl (olddecl, | |
1750 | "doesn't match non-prototype definition here"); | |
1751 | } | |
1752 | else | |
1753 | { | |
1754 | warning_with_decl (newdecl, "prototype for `%s' follows"); | |
1755 | warning_with_decl (olddecl, "non-prototype definition here"); | |
1756 | } | |
1757 | } | |
8eebb258 | 1758 | /* Warn about mismatches in various flags. */ |
51e29401 RS |
1759 | else |
1760 | { | |
8eebb258 RS |
1761 | /* Warn if function is now inline |
1762 | but was previously declared not inline and has been called. */ | |
51e29401 | 1763 | if (TREE_CODE (olddecl) == FUNCTION_DECL |
1394aabd | 1764 | && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl) |
51e29401 RS |
1765 | && TREE_USED (olddecl)) |
1766 | warning_with_decl (newdecl, | |
1767 | "`%s' declared inline after being called"); | |
1768 | if (TREE_CODE (olddecl) == FUNCTION_DECL | |
1394aabd | 1769 | && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl) |
960a2eb1 | 1770 | && DECL_INITIAL (olddecl) != 0) |
51e29401 | 1771 | warning_with_decl (newdecl, |
960a2eb1 | 1772 | "`%s' declared inline after its definition"); |
a1a77352 JW |
1773 | |
1774 | /* If pedantic, warn when static declaration follows a non-static | |
1775 | declaration. Otherwise, do so only for functions. */ | |
1776 | if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL) | |
51e29401 RS |
1777 | && TREE_PUBLIC (olddecl) |
1778 | && !TREE_PUBLIC (newdecl)) | |
1779 | warning_with_decl (newdecl, "static declaration for `%s' follows non-static"); | |
1780 | ||
2af6a433 RK |
1781 | /* Warn when const declaration follows a non-const |
1782 | declaration, but not for functions. */ | |
1783 | if (TREE_CODE (olddecl) != FUNCTION_DECL | |
1784 | && !TREE_READONLY (olddecl) | |
1785 | && TREE_READONLY (newdecl)) | |
1786 | warning_with_decl (newdecl, "const declaration for `%s' follows non-const"); | |
8eebb258 RS |
1787 | /* These bits are logically part of the type, for variables. |
1788 | But not for functions | |
1789 | (where qualifiers are not valid ANSI anyway). */ | |
2af6a433 | 1790 | else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL |
51e29401 RS |
1791 | && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl) |
1792 | || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl))) | |
1793 | pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl"); | |
1794 | } | |
1795 | } | |
1796 | ||
27f427f8 | 1797 | /* Optionally warn about more than one declaration for the same name. */ |
5ce574f2 | 1798 | if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0 |
956d6950 | 1799 | /* Don't warn about a function declaration |
27f427f8 RS |
1800 | followed by a definition. */ |
1801 | && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0 | |
ec820a12 RS |
1802 | && DECL_INITIAL (olddecl) == 0) |
1803 | /* Don't warn about extern decl followed by (tentative) definition. */ | |
1804 | && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))) | |
27f427f8 RS |
1805 | { |
1806 | warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope"); | |
1807 | warning_with_decl (olddecl, "previous declaration of `%s'"); | |
1808 | } | |
1809 | ||
51e29401 | 1810 | /* Copy all the DECL_... slots specified in the new decl |
664b4b1e RS |
1811 | except for any that we copy here from the old type. |
1812 | ||
1813 | Past this point, we don't change OLDTYPE and NEWTYPE | |
1814 | even if we change the types of NEWDECL and OLDDECL. */ | |
51e29401 RS |
1815 | |
1816 | if (types_match) | |
1817 | { | |
bf44f7de JW |
1818 | /* When copying info to olddecl, we store into write_olddecl |
1819 | instead. This allows us to avoid modifying olddecl when | |
1820 | different_binding_level is true. */ | |
1821 | tree write_olddecl = different_binding_level ? newdecl : olddecl; | |
1822 | ||
46b1c393 RK |
1823 | /* Make sure we put the new type in the same obstack as the old ones. |
1824 | If the old types are not both in the same obstack, use the permanent | |
1825 | one. */ | |
1826 | if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype)) | |
1827 | push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype)); | |
1828 | else | |
1829 | { | |
1830 | push_obstacks_nochange (); | |
1831 | end_temporary_allocation (); | |
1832 | } | |
1833 | ||
51e29401 RS |
1834 | /* Merge the data types specified in the two decls. */ |
1835 | if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl)) | |
bf44f7de JW |
1836 | { |
1837 | if (different_binding_level) | |
1838 | TREE_TYPE (newdecl) | |
1839 | = build_type_attribute_variant | |
1840 | (newtype, | |
1841 | merge_attributes (TYPE_ATTRIBUTES (newtype), | |
1842 | TYPE_ATTRIBUTES (oldtype))); | |
1843 | else | |
1844 | TREE_TYPE (newdecl) | |
1845 | = TREE_TYPE (olddecl) | |
1846 | = common_type (newtype, oldtype); | |
1847 | } | |
51e29401 RS |
1848 | |
1849 | /* Lay the type out, unless already done. */ | |
1850 | if (oldtype != TREE_TYPE (newdecl)) | |
1851 | { | |
1852 | if (TREE_TYPE (newdecl) != error_mark_node) | |
1853 | layout_type (TREE_TYPE (newdecl)); | |
1854 | if (TREE_CODE (newdecl) != FUNCTION_DECL | |
1855 | && TREE_CODE (newdecl) != TYPE_DECL | |
1856 | && TREE_CODE (newdecl) != CONST_DECL) | |
1857 | layout_decl (newdecl, 0); | |
1858 | } | |
1859 | else | |
1860 | { | |
1861 | /* Since the type is OLDDECL's, make OLDDECL's size go with. */ | |
1862 | DECL_SIZE (newdecl) = DECL_SIZE (olddecl); | |
ec2343c4 MM |
1863 | if (TREE_CODE (olddecl) != FUNCTION_DECL) |
1864 | if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl)) | |
1865 | DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl); | |
51e29401 RS |
1866 | } |
1867 | ||
fc542d3c RS |
1868 | /* Keep the old rtl since we can safely use it. */ |
1869 | DECL_RTL (newdecl) = DECL_RTL (olddecl); | |
1870 | ||
51e29401 RS |
1871 | /* Merge the type qualifiers. */ |
1872 | if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl) | |
1873 | && !TREE_THIS_VOLATILE (newdecl)) | |
bf44f7de | 1874 | TREE_THIS_VOLATILE (write_olddecl) = 0; |
51e29401 | 1875 | if (TREE_READONLY (newdecl)) |
bf44f7de | 1876 | TREE_READONLY (write_olddecl) = 1; |
51e29401 | 1877 | if (TREE_THIS_VOLATILE (newdecl)) |
e2f6a3cf | 1878 | { |
bf44f7de | 1879 | TREE_THIS_VOLATILE (write_olddecl) = 1; |
e2f6a3cf RS |
1880 | if (TREE_CODE (newdecl) == VAR_DECL) |
1881 | make_var_volatile (newdecl); | |
1882 | } | |
51e29401 | 1883 | |
bf44f7de JW |
1884 | /* Keep source location of definition rather than declaration. */ |
1885 | /* When called with different_binding_level set, keep the old | |
1886 | information so that meaningful diagnostics can be given. */ | |
1887 | if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0 | |
1888 | && ! different_binding_level) | |
51e29401 RS |
1889 | { |
1890 | DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl); | |
1891 | DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl); | |
1892 | } | |
1893 | ||
e2f6a3cf RS |
1894 | /* Merge the unused-warning information. */ |
1895 | if (DECL_IN_SYSTEM_HEADER (olddecl)) | |
1896 | DECL_IN_SYSTEM_HEADER (newdecl) = 1; | |
1897 | else if (DECL_IN_SYSTEM_HEADER (newdecl)) | |
bf44f7de | 1898 | DECL_IN_SYSTEM_HEADER (write_olddecl) = 1; |
e2f6a3cf | 1899 | |
51e29401 | 1900 | /* Merge the initialization information. */ |
bf44f7de JW |
1901 | /* When called with different_binding_level set, don't copy over |
1902 | DECL_INITIAL, so that we don't accidentally change function | |
1903 | declarations into function definitions. */ | |
1904 | if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level) | |
51e29401 | 1905 | DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl); |
1e50b042 DE |
1906 | |
1907 | /* Merge the section attribute. | |
1908 | We want to issue an error if the sections conflict but that must be | |
1909 | done later in decl_attributes since we are called before attributes | |
1910 | are assigned. */ | |
1911 | if (DECL_SECTION_NAME (newdecl) == NULL_TREE) | |
1912 | DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl); | |
46b1c393 | 1913 | |
2c5f4139 JM |
1914 | if (TREE_CODE (newdecl) == FUNCTION_DECL) |
1915 | { | |
1916 | DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl); | |
1917 | DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl); | |
1918 | } | |
1919 | ||
46b1c393 | 1920 | pop_obstacks (); |
51e29401 RS |
1921 | } |
1922 | /* If cannot merge, then use the new type and qualifiers, | |
1923 | and don't preserve the old rtl. */ | |
bf44f7de | 1924 | else if (! different_binding_level) |
51e29401 RS |
1925 | { |
1926 | TREE_TYPE (olddecl) = TREE_TYPE (newdecl); | |
1927 | TREE_READONLY (olddecl) = TREE_READONLY (newdecl); | |
1928 | TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl); | |
1929 | TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl); | |
1930 | } | |
1931 | ||
1932 | /* Merge the storage class information. */ | |
daefd78b | 1933 | DECL_WEAK (newdecl) |= DECL_WEAK (olddecl); |
51e29401 RS |
1934 | /* For functions, static overrides non-static. */ |
1935 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
1936 | { | |
1937 | TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl); | |
1938 | /* This is since we don't automatically | |
1939 | copy the attributes of NEWDECL into OLDDECL. */ | |
bf44f7de JW |
1940 | /* No need to worry about different_binding_level here because |
1941 | then TREE_PUBLIC (newdecl) was true. */ | |
51e29401 RS |
1942 | TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl); |
1943 | /* If this clears `static', clear it in the identifier too. */ | |
1944 | if (! TREE_PUBLIC (olddecl)) | |
1945 | TREE_PUBLIC (DECL_NAME (olddecl)) = 0; | |
1946 | } | |
1394aabd | 1947 | if (DECL_EXTERNAL (newdecl)) |
51e29401 RS |
1948 | { |
1949 | TREE_STATIC (newdecl) = TREE_STATIC (olddecl); | |
1394aabd | 1950 | DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl); |
51e29401 RS |
1951 | /* An extern decl does not override previous storage class. */ |
1952 | TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl); | |
0ecef3cf RK |
1953 | if (! DECL_EXTERNAL (newdecl)) |
1954 | DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl); | |
51e29401 RS |
1955 | } |
1956 | else | |
1957 | { | |
1958 | TREE_STATIC (olddecl) = TREE_STATIC (newdecl); | |
51e29401 RS |
1959 | TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl); |
1960 | } | |
850cba29 | 1961 | |
51e29401 RS |
1962 | /* If either decl says `inline', this fn is inline, |
1963 | unless its definition was passed already. */ | |
1394aabd RS |
1964 | if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0) |
1965 | DECL_INLINE (olddecl) = 1; | |
850cba29 | 1966 | DECL_INLINE (newdecl) = DECL_INLINE (olddecl); |
51e29401 | 1967 | |
bf44f7de | 1968 | if (TREE_CODE (newdecl) == FUNCTION_DECL) |
51e29401 RS |
1969 | { |
1970 | if (DECL_BUILT_IN (olddecl)) | |
1971 | { | |
bf44f7de JW |
1972 | /* Get rid of any built-in function if new arg types don't match it |
1973 | or if we have a function definition. */ | |
1974 | if (! types_match || new_is_definition) | |
1975 | { | |
1976 | if (! different_binding_level) | |
1977 | { | |
1978 | TREE_TYPE (olddecl) = TREE_TYPE (newdecl); | |
1979 | DECL_BUILT_IN (olddecl) = 0; | |
1980 | } | |
1981 | } | |
1982 | else | |
1983 | { | |
1984 | /* If redeclaring a builtin function, and not a definition, | |
1985 | it stays built in. */ | |
1986 | DECL_BUILT_IN (newdecl) = 1; | |
1987 | DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl); | |
1988 | } | |
51e29401 | 1989 | } |
bf44f7de JW |
1990 | /* Also preserve various other info from the definition. */ |
1991 | else if (! new_is_definition) | |
51e29401 | 1992 | DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl); |
bf44f7de JW |
1993 | if (! new_is_definition) |
1994 | { | |
1995 | DECL_RESULT (newdecl) = DECL_RESULT (olddecl); | |
1996 | /* When called with different_binding_level set, don't copy over | |
1997 | DECL_INITIAL, so that we don't accidentally change function | |
1998 | declarations into function definitions. */ | |
1999 | if (! different_binding_level) | |
2000 | DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl); | |
2001 | DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl); | |
2002 | DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl); | |
bb8eaf4a DE |
2003 | if (DECL_INLINE (newdecl)) |
2004 | DECL_ABSTRACT_ORIGIN (newdecl) = olddecl; | |
bf44f7de JW |
2005 | } |
2006 | } | |
2007 | if (different_binding_level) | |
2008 | { | |
e5e809f4 JL |
2009 | /* Don't output a duplicate symbol or debugging information for this |
2010 | declaration. */ | |
2011 | TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1; | |
bf44f7de | 2012 | return 0; |
51e29401 RS |
2013 | } |
2014 | ||
850cba29 | 2015 | /* Copy most of the decl-specific fields of NEWDECL into OLDDECL. |
e5e809f4 | 2016 | But preserve OLDDECL's DECL_UID. */ |
850cba29 RS |
2017 | { |
2018 | register unsigned olddecl_uid = DECL_UID (olddecl); | |
2019 | ||
2020 | bcopy ((char *) newdecl + sizeof (struct tree_common), | |
2021 | (char *) olddecl + sizeof (struct tree_common), | |
2022 | sizeof (struct tree_decl) - sizeof (struct tree_common)); | |
2023 | DECL_UID (olddecl) = olddecl_uid; | |
2024 | } | |
51e29401 | 2025 | |
d9525bec BK |
2026 | /* NEWDECL contains the merged attribute lists. |
2027 | Update OLDDECL to be the same. */ | |
2028 | DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl); | |
2029 | ||
51e29401 RS |
2030 | return 1; |
2031 | } | |
2032 | ||
2033 | /* Record a decl-node X as belonging to the current lexical scope. | |
2034 | Check for errors (such as an incompatible declaration for the same | |
2035 | name already seen in the same scope). | |
2036 | ||
2037 | Returns either X or an old decl for the same name. | |
2038 | If an old decl is returned, it may have been smashed | |
2039 | to agree with what X says. */ | |
2040 | ||
2041 | tree | |
2042 | pushdecl (x) | |
2043 | tree x; | |
2044 | { | |
2045 | register tree t; | |
2046 | register tree name = DECL_NAME (x); | |
2047 | register struct binding_level *b = current_binding_level; | |
2048 | ||
2049 | DECL_CONTEXT (x) = current_function_decl; | |
89d7540d RS |
2050 | /* A local extern declaration for a function doesn't constitute nesting. |
2051 | A local auto declaration does, since it's a forward decl | |
2052 | for a nested function coming later. */ | |
2053 | if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0 | |
2054 | && DECL_EXTERNAL (x)) | |
51e29401 RS |
2055 | DECL_CONTEXT (x) = 0; |
2056 | ||
1394aabd | 2057 | if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level |
6e026f48 MM |
2058 | && x != IDENTIFIER_IMPLICIT_DECL (name) |
2059 | /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */ | |
2060 | && !DECL_IN_SYSTEM_HEADER (x)) | |
51e29401 RS |
2061 | warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name)); |
2062 | ||
2063 | if (name) | |
2064 | { | |
2065 | char *file; | |
2066 | int line; | |
bf44f7de | 2067 | int different_binding_level = 0; |
51e29401 | 2068 | |
bf44f7de | 2069 | t = lookup_name_current_level (name); |
93f623fa JW |
2070 | /* Don't type check externs here when -traditional. This is so that |
2071 | code with conflicting declarations inside blocks will get warnings | |
2072 | not errors. X11 for instance depends on this. */ | |
bf44f7de JW |
2073 | if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional) |
2074 | { | |
2075 | t = IDENTIFIER_GLOBAL_VALUE (name); | |
2076 | /* Type decls at global scope don't conflict with externs declared | |
2077 | inside lexical blocks. */ | |
2078 | if (t && TREE_CODE (t) == TYPE_DECL) | |
2079 | t = 0; | |
2080 | different_binding_level = 1; | |
2081 | } | |
51e29401 RS |
2082 | if (t != 0 && t == error_mark_node) |
2083 | /* error_mark_node is 0 for a while during initialization! */ | |
2084 | { | |
2085 | t = 0; | |
2086 | error_with_decl (x, "`%s' used prior to declaration"); | |
2087 | } | |
2088 | ||
2089 | if (t != 0) | |
2090 | { | |
2091 | file = DECL_SOURCE_FILE (t); | |
2092 | line = DECL_SOURCE_LINE (t); | |
2093 | } | |
2094 | ||
bf44f7de JW |
2095 | /* If this decl is `static' and an implicit decl was seen previously, |
2096 | warn. But don't complain if -traditional, | |
2097 | since traditional compilers don't complain. */ | |
2098 | if (! flag_traditional && TREE_PUBLIC (name) | |
2099 | /* Don't test for DECL_EXTERNAL, because grokdeclarator | |
2100 | sets this for all functions. */ | |
2101 | && ! TREE_PUBLIC (x) | |
d20ae480 | 2102 | && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level) |
bf44f7de JW |
2103 | /* We used to warn also for explicit extern followed by static, |
2104 | but sometimes you need to do it that way. */ | |
2105 | && IDENTIFIER_IMPLICIT_DECL (name) != 0) | |
2106 | { | |
2107 | pedwarn ("`%s' was declared implicitly `extern' and later `static'", | |
2108 | IDENTIFIER_POINTER (name)); | |
2109 | pedwarn_with_file_and_line | |
2110 | (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)), | |
2111 | DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)), | |
2112 | "previous declaration of `%s'", | |
2113 | IDENTIFIER_POINTER (name)); | |
f5963e61 | 2114 | TREE_THIS_VOLATILE (name) = 1; |
bf44f7de JW |
2115 | } |
2116 | ||
2117 | if (t != 0 && duplicate_decls (x, t, different_binding_level)) | |
51e29401 RS |
2118 | { |
2119 | if (TREE_CODE (t) == PARM_DECL) | |
2120 | { | |
2121 | /* Don't allow more than one "real" duplicate | |
2122 | of a forward parm decl. */ | |
2123 | TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x); | |
2124 | return t; | |
2125 | } | |
bf44f7de | 2126 | return t; |
51e29401 RS |
2127 | } |
2128 | ||
1ce634c3 RS |
2129 | /* If we are processing a typedef statement, generate a whole new |
2130 | ..._TYPE node (which will be just an variant of the existing | |
2131 | ..._TYPE node with identical properties) and then install the | |
2132 | TYPE_DECL node generated to represent the typedef name as the | |
2133 | TYPE_NAME of this brand new (duplicate) ..._TYPE node. | |
2134 | ||
2135 | The whole point here is to end up with a situation where each | |
2136 | and every ..._TYPE node the compiler creates will be uniquely | |
2137 | associated with AT MOST one node representing a typedef name. | |
2138 | This way, even though the compiler substitutes corresponding | |
2139 | ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very | |
2140 | early on, later parts of the compiler can always do the reverse | |
2141 | translation and get back the corresponding typedef name. For | |
2142 | example, given: | |
2143 | ||
2144 | typedef struct S MY_TYPE; | |
2145 | MY_TYPE object; | |
2146 | ||
2147 | Later parts of the compiler might only know that `object' was of | |
38e01259 | 2148 | type `struct S' if it were not for code just below. With this |
1ce634c3 RS |
2149 | code however, later parts of the compiler see something like: |
2150 | ||
2151 | struct S' == struct S | |
2152 | typedef struct S' MY_TYPE; | |
2153 | struct S' object; | |
2154 | ||
2155 | And they can then deduce (from the node for type struct S') that | |
2156 | the original object declaration was: | |
2157 | ||
2158 | MY_TYPE object; | |
2159 | ||
2160 | Being able to do this is important for proper support of protoize, | |
2161 | and also for generating precise symbolic debugging information | |
2162 | which takes full account of the programmer's (typedef) vocabulary. | |
2163 | ||
2164 | Obviously, we don't want to generate a duplicate ..._TYPE node if | |
2165 | the TYPE_DECL node that we are now processing really represents a | |
2166 | standard built-in type. | |
2167 | ||
51e29401 RS |
2168 | Since all standard types are effectively declared at line zero |
2169 | in the source file, we can easily check to see if we are working | |
2170 | on a standard type by checking the current value of lineno. */ | |
2171 | ||
2172 | if (TREE_CODE (x) == TYPE_DECL) | |
2173 | { | |
1600ec67 | 2174 | if (DECL_SOURCE_LINE (x) == 0) |
51e29401 RS |
2175 | { |
2176 | if (TYPE_NAME (TREE_TYPE (x)) == 0) | |
2177 | TYPE_NAME (TREE_TYPE (x)) = x; | |
2178 | } | |
6553db01 GM |
2179 | else if (TREE_TYPE (x) != error_mark_node |
2180 | && DECL_ORIGINAL_TYPE (x) == NULL_TREE) | |
51e29401 RS |
2181 | { |
2182 | tree tt = TREE_TYPE (x); | |
8ee15cd7 | 2183 | DECL_ORIGINAL_TYPE (x) = tt; |
1ce634c3 | 2184 | tt = build_type_copy (tt); |
51e29401 RS |
2185 | TYPE_NAME (tt) = x; |
2186 | TREE_TYPE (x) = tt; | |
2187 | } | |
2188 | } | |
2189 | ||
fd0b8fce | 2190 | /* Multiple external decls of the same identifier ought to match. |
93f623fa JW |
2191 | Check against both global declarations (when traditional) and out of |
2192 | scope (limbo) block level declarations. | |
51e29401 | 2193 | |
fd0b8fce JW |
2194 | We get warnings about inline functions where they are defined. |
2195 | Avoid duplicate warnings where they are used. */ | |
93f623fa | 2196 | if (TREE_PUBLIC (x) && ! DECL_INLINE (x)) |
51e29401 | 2197 | { |
93f623fa JW |
2198 | tree decl; |
2199 | ||
2200 | if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0 | |
2201 | && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name)) | |
2202 | || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name)))) | |
2203 | decl = IDENTIFIER_GLOBAL_VALUE (name); | |
2204 | else if (IDENTIFIER_LIMBO_VALUE (name) != 0) | |
2205 | /* Decls in limbo are always extern, so no need to check that. */ | |
2206 | decl = IDENTIFIER_LIMBO_VALUE (name); | |
2207 | else | |
2208 | decl = 0; | |
fd0b8fce | 2209 | |
93f623fa | 2210 | if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl)) |
58811315 RS |
2211 | /* If old decl is built-in, we already warned if we should. */ |
2212 | && !DECL_BUILT_IN (decl)) | |
51e29401 RS |
2213 | { |
2214 | pedwarn_with_decl (x, | |
2215 | "type mismatch with previous external decl"); | |
fd0b8fce | 2216 | pedwarn_with_decl (decl, "previous external decl of `%s'"); |
51e29401 RS |
2217 | } |
2218 | } | |
2219 | ||
2220 | /* If a function has had an implicit declaration, and then is defined, | |
2221 | make sure they are compatible. */ | |
2222 | ||
2223 | if (IDENTIFIER_IMPLICIT_DECL (name) != 0 | |
2224 | && IDENTIFIER_GLOBAL_VALUE (name) == 0 | |
2225 | && TREE_CODE (x) == FUNCTION_DECL | |
2226 | && ! comptypes (TREE_TYPE (x), | |
2227 | TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name)))) | |
2228 | { | |
2229 | warning_with_decl (x, "type mismatch with previous implicit declaration"); | |
929f3671 RS |
2230 | warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name), |
2231 | "previous implicit declaration of `%s'"); | |
51e29401 RS |
2232 | } |
2233 | ||
2234 | /* In PCC-compatibility mode, extern decls of vars with no current decl | |
2235 | take effect at top level no matter where they are. */ | |
1394aabd | 2236 | if (flag_traditional && DECL_EXTERNAL (x) |
51e29401 RS |
2237 | && lookup_name (name) == 0) |
2238 | { | |
2239 | tree type = TREE_TYPE (x); | |
2240 | ||
2241 | /* But don't do this if the type contains temporary nodes. */ | |
2242 | while (type) | |
2243 | { | |
2244 | if (type == error_mark_node) | |
2245 | break; | |
2246 | if (! TREE_PERMANENT (type)) | |
2247 | { | |
2248 | warning_with_decl (x, "type of external `%s' is not global"); | |
2249 | /* By exiting the loop early, we leave TYPE nonzero, | |
2250 | and thus prevent globalization of the decl. */ | |
2251 | break; | |
2252 | } | |
2253 | else if (TREE_CODE (type) == FUNCTION_TYPE | |
2254 | && TYPE_ARG_TYPES (type) != 0) | |
2255 | /* The types might not be truly local, | |
2256 | but the list of arg types certainly is temporary. | |
2257 | Since prototypes are nontraditional, | |
2258 | ok not to do the traditional thing. */ | |
2259 | break; | |
2260 | type = TREE_TYPE (type); | |
2261 | } | |
2262 | ||
2263 | if (type == 0) | |
2264 | b = global_binding_level; | |
2265 | } | |
2266 | ||
2267 | /* This name is new in its binding level. | |
2268 | Install the new declaration and return it. */ | |
2269 | if (b == global_binding_level) | |
2270 | { | |
2271 | /* Install a global value. */ | |
2272 | ||
2273 | /* If the first global decl has external linkage, | |
2274 | warn if we later see static one. */ | |
2275 | if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x)) | |
2276 | TREE_PUBLIC (name) = 1; | |
2277 | ||
2278 | IDENTIFIER_GLOBAL_VALUE (name) = x; | |
2279 | ||
fd0b8fce JW |
2280 | /* We no longer care about any previous block level declarations. */ |
2281 | IDENTIFIER_LIMBO_VALUE (name) = 0; | |
2282 | ||
51e29401 RS |
2283 | /* Don't forget if the function was used via an implicit decl. */ |
2284 | if (IDENTIFIER_IMPLICIT_DECL (name) | |
2285 | && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name))) | |
2286 | TREE_USED (x) = 1, TREE_USED (name) = 1; | |
2287 | ||
2288 | /* Don't forget if its address was taken in that way. */ | |
2289 | if (IDENTIFIER_IMPLICIT_DECL (name) | |
2290 | && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name))) | |
2291 | TREE_ADDRESSABLE (x) = 1; | |
2292 | ||
2293 | /* Warn about mismatches against previous implicit decl. */ | |
2294 | if (IDENTIFIER_IMPLICIT_DECL (name) != 0 | |
2295 | /* If this real decl matches the implicit, don't complain. */ | |
2296 | && ! (TREE_CODE (x) == FUNCTION_DECL | |
90d56da8 RS |
2297 | && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x))) |
2298 | == integer_type_node))) | |
51e29401 RS |
2299 | pedwarn ("`%s' was previously implicitly declared to return `int'", |
2300 | IDENTIFIER_POINTER (name)); | |
2301 | ||
2302 | /* If this decl is `static' and an `extern' was seen previously, | |
2303 | that is erroneous. */ | |
2304 | if (TREE_PUBLIC (name) | |
1394aabd | 2305 | && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x)) |
51e29401 | 2306 | { |
b0e919de RS |
2307 | /* Okay to redeclare an ANSI built-in as static. */ |
2308 | if (t != 0 && DECL_BUILT_IN (t)) | |
929f3671 RS |
2309 | ; |
2310 | /* Okay to declare a non-ANSI built-in as anything. */ | |
2311 | else if (t != 0 && DECL_BUILT_IN_NONANSI (t)) | |
2312 | ; | |
bf44f7de JW |
2313 | /* Okay to have global type decl after an earlier extern |
2314 | declaration inside a lexical block. */ | |
2315 | else if (TREE_CODE (x) == TYPE_DECL) | |
2316 | ; | |
929f3671 | 2317 | else if (IDENTIFIER_IMPLICIT_DECL (name)) |
f5963e61 JL |
2318 | { |
2319 | if (! TREE_THIS_VOLATILE (name)) | |
2320 | pedwarn ("`%s' was declared implicitly `extern' and later `static'", | |
2321 | IDENTIFIER_POINTER (name)); | |
2322 | } | |
51e29401 RS |
2323 | else |
2324 | pedwarn ("`%s' was declared `extern' and later `static'", | |
2325 | IDENTIFIER_POINTER (name)); | |
2326 | } | |
2327 | } | |
2328 | else | |
2329 | { | |
2330 | /* Here to install a non-global value. */ | |
2331 | tree oldlocal = IDENTIFIER_LOCAL_VALUE (name); | |
2332 | tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name); | |
2333 | IDENTIFIER_LOCAL_VALUE (name) = x; | |
2334 | ||
2335 | /* If this is an extern function declaration, see if we | |
fc542d3c | 2336 | have a global definition or declaration for the function. */ |
51e29401 | 2337 | if (oldlocal == 0 |
1394aabd | 2338 | && DECL_EXTERNAL (x) && !DECL_INLINE (x) |
51e29401 RS |
2339 | && oldglobal != 0 |
2340 | && TREE_CODE (x) == FUNCTION_DECL | |
2341 | && TREE_CODE (oldglobal) == FUNCTION_DECL) | |
2342 | { | |
2343 | /* We have one. Their types must agree. */ | |
2344 | if (! comptypes (TREE_TYPE (x), | |
2345 | TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name)))) | |
fc542d3c RS |
2346 | pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one"); |
2347 | else | |
2348 | { | |
2349 | /* Inner extern decl is inline if global one is. | |
2350 | Copy enough to really inline it. */ | |
2351 | if (DECL_INLINE (oldglobal)) | |
2352 | { | |
2353 | DECL_INLINE (x) = DECL_INLINE (oldglobal); | |
4135e766 RS |
2354 | DECL_INITIAL (x) = (current_function_decl == oldglobal |
2355 | ? 0 : DECL_INITIAL (oldglobal)); | |
fc542d3c | 2356 | DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal); |
a2469305 | 2357 | DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal); |
fc542d3c | 2358 | DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal); |
42dfa47f RS |
2359 | DECL_RESULT (x) = DECL_RESULT (oldglobal); |
2360 | TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal); | |
2361 | DECL_ABSTRACT_ORIGIN (x) = oldglobal; | |
fc542d3c RS |
2362 | } |
2363 | /* Inner extern decl is built-in if global one is. */ | |
2364 | if (DECL_BUILT_IN (oldglobal)) | |
2365 | { | |
2366 | DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal); | |
678566a5 | 2367 | DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal); |
fc542d3c RS |
2368 | } |
2369 | /* Keep the arg types from a file-scope fcn defn. */ | |
2370 | if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0 | |
2371 | && DECL_INITIAL (oldglobal) | |
2372 | && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0) | |
2373 | TREE_TYPE (x) = TREE_TYPE (oldglobal); | |
2374 | } | |
51e29401 RS |
2375 | } |
2376 | ||
2377 | #if 0 /* This case is probably sometimes the right thing to do. */ | |
2378 | /* If we have a local external declaration, | |
2379 | then any file-scope declaration should not | |
2380 | have been static. */ | |
2381 | if (oldlocal == 0 && oldglobal != 0 | |
2382 | && !TREE_PUBLIC (oldglobal) | |
1394aabd | 2383 | && DECL_EXTERNAL (x) && TREE_PUBLIC (x)) |
51e29401 RS |
2384 | warning ("`%s' locally external but globally static", |
2385 | IDENTIFIER_POINTER (name)); | |
2386 | #endif | |
2387 | ||
2388 | /* If we have a local external declaration, | |
2389 | and no file-scope declaration has yet been seen, | |
2390 | then if we later have a file-scope decl it must not be static. */ | |
2391 | if (oldlocal == 0 | |
1394aabd | 2392 | && DECL_EXTERNAL (x) |
51e29401 RS |
2393 | && TREE_PUBLIC (x)) |
2394 | { | |
bf44f7de JW |
2395 | if (oldglobal == 0) |
2396 | TREE_PUBLIC (name) = 1; | |
fd0b8fce JW |
2397 | |
2398 | /* Save this decl, so that we can do type checking against | |
2399 | other decls after it falls out of scope. | |
2400 | ||
2401 | Only save it once. This prevents temporary decls created in | |
2402 | expand_inline_function from being used here, since this | |
2403 | will have been set when the inline function was parsed. | |
2404 | It also helps give slightly better warnings. */ | |
2405 | if (IDENTIFIER_LIMBO_VALUE (name) == 0) | |
2406 | IDENTIFIER_LIMBO_VALUE (name) = x; | |
51e29401 RS |
2407 | } |
2408 | ||
2409 | /* Warn if shadowing an argument at the top level of the body. */ | |
1394aabd | 2410 | if (oldlocal != 0 && !DECL_EXTERNAL (x) |
51e29401 RS |
2411 | /* This warning doesn't apply to the parms of a nested fcn. */ |
2412 | && ! current_binding_level->parm_flag | |
2413 | /* Check that this is one level down from the parms. */ | |
2414 | && current_binding_level->level_chain->parm_flag | |
2415 | /* Check that the decl being shadowed | |
2416 | comes from the parm level, one level up. */ | |
2417 | && chain_member (oldlocal, current_binding_level->level_chain->names)) | |
2418 | { | |
2419 | if (TREE_CODE (oldlocal) == PARM_DECL) | |
2420 | pedwarn ("declaration of `%s' shadows a parameter", | |
2421 | IDENTIFIER_POINTER (name)); | |
2422 | else | |
2423 | pedwarn ("declaration of `%s' shadows a symbol from the parameter list", | |
2424 | IDENTIFIER_POINTER (name)); | |
2425 | } | |
2426 | ||
2427 | /* Maybe warn if shadowing something else. */ | |
1394aabd | 2428 | else if (warn_shadow && !DECL_EXTERNAL (x) |
2bae939e | 2429 | /* No shadow warnings for internally generated vars. */ |
7a0347ff | 2430 | && DECL_SOURCE_LINE (x) != 0 |
51e29401 | 2431 | /* No shadow warnings for vars made for inlining. */ |
b032c74c | 2432 | && ! DECL_FROM_INLINE (x)) |
51e29401 RS |
2433 | { |
2434 | char *warnstring = 0; | |
2435 | ||
2436 | if (TREE_CODE (x) == PARM_DECL | |
89d7540d RS |
2437 | && current_binding_level->level_chain->parm_flag) |
2438 | /* Don't warn about the parm names in function declarator | |
2439 | within a function declarator. | |
2440 | It would be nice to avoid warning in any function | |
2441 | declarator in a declaration, as opposed to a definition, | |
2442 | but there is no way to tell it's not a definition. */ | |
51e29401 RS |
2443 | ; |
2444 | else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL) | |
2445 | warnstring = "declaration of `%s' shadows a parameter"; | |
2446 | else if (oldlocal != 0) | |
2447 | warnstring = "declaration of `%s' shadows previous local"; | |
2448 | else if (IDENTIFIER_GLOBAL_VALUE (name) != 0 | |
2449 | && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node) | |
2450 | warnstring = "declaration of `%s' shadows global declaration"; | |
2451 | ||
2452 | if (warnstring) | |
2453 | warning (warnstring, IDENTIFIER_POINTER (name)); | |
2454 | } | |
2455 | ||
2456 | /* If storing a local value, there may already be one (inherited). | |
2457 | If so, record it for restoration when this binding level ends. */ | |
2458 | if (oldlocal != 0) | |
2459 | b->shadowed = tree_cons (name, oldlocal, b->shadowed); | |
2460 | } | |
2461 | ||
2462 | /* Keep count of variables in this level with incomplete type. */ | |
2463 | if (TYPE_SIZE (TREE_TYPE (x)) == 0) | |
2464 | ++b->n_incomplete; | |
2465 | } | |
2466 | ||
2467 | /* Put decls on list in reverse order. | |
2468 | We will reverse them later if necessary. */ | |
2469 | TREE_CHAIN (x) = b->names; | |
2470 | b->names = x; | |
2471 | ||
2472 | return x; | |
2473 | } | |
2474 | ||
2475 | /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */ | |
2476 | ||
2477 | tree | |
2478 | pushdecl_top_level (x) | |
2479 | tree x; | |
2480 | { | |
2481 | register tree t; | |
2482 | register struct binding_level *b = current_binding_level; | |
2483 | ||
2484 | current_binding_level = global_binding_level; | |
2485 | t = pushdecl (x); | |
2486 | current_binding_level = b; | |
2487 | return t; | |
2488 | } | |
2489 | \f | |
2490 | /* Generate an implicit declaration for identifier FUNCTIONID | |
2491 | as a function of type int (). Print a warning if appropriate. */ | |
2492 | ||
2493 | tree | |
2494 | implicitly_declare (functionid) | |
2495 | tree functionid; | |
2496 | { | |
2497 | register tree decl; | |
2498 | int traditional_warning = 0; | |
2499 | /* Only one "implicit declaration" warning per identifier. */ | |
2500 | int implicit_warning; | |
2501 | ||
2502 | /* Save the decl permanently so we can warn if definition follows. */ | |
2503 | push_obstacks_nochange (); | |
2504 | end_temporary_allocation (); | |
2505 | ||
2506 | /* We used to reuse an old implicit decl here, | |
2507 | but this loses with inline functions because it can clobber | |
2508 | the saved decl chains. */ | |
2509 | /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0) | |
2510 | decl = IDENTIFIER_IMPLICIT_DECL (functionid); | |
2511 | else */ | |
2512 | decl = build_decl (FUNCTION_DECL, functionid, default_function_type); | |
2513 | ||
2514 | /* Warn of implicit decl following explicit local extern decl. | |
2515 | This is probably a program designed for traditional C. */ | |
2516 | if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0) | |
2517 | traditional_warning = 1; | |
2518 | ||
2519 | /* Warn once of an implicit declaration. */ | |
2520 | implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0); | |
2521 | ||
1394aabd | 2522 | DECL_EXTERNAL (decl) = 1; |
51e29401 RS |
2523 | TREE_PUBLIC (decl) = 1; |
2524 | ||
2525 | /* Record that we have an implicit decl and this is it. */ | |
2526 | IDENTIFIER_IMPLICIT_DECL (functionid) = decl; | |
2527 | ||
2528 | /* ANSI standard says implicit declarations are in the innermost block. | |
2529 | So we record the decl in the standard fashion. | |
2530 | If flag_traditional is set, pushdecl does it top-level. */ | |
2531 | pushdecl (decl); | |
2532 | ||
2533 | /* This is a no-op in c-lang.c or something real in objc-actions.c. */ | |
2534 | maybe_objc_check_decl (decl); | |
2535 | ||
8d9bfdc5 | 2536 | rest_of_decl_compilation (decl, NULL_PTR, 0, 0); |
51e29401 | 2537 | |
e9a25f70 JL |
2538 | if (mesg_implicit_function_declaration && implicit_warning) |
2539 | { | |
2540 | if (mesg_implicit_function_declaration == 2) | |
2541 | error ("implicit declaration of function `%s'", | |
2542 | IDENTIFIER_POINTER (functionid)); | |
2543 | else | |
2544 | warning ("implicit declaration of function `%s'", | |
2545 | IDENTIFIER_POINTER (functionid)); | |
2546 | } | |
51e29401 RS |
2547 | else if (warn_traditional && traditional_warning) |
2548 | warning ("function `%s' was previously declared within a block", | |
2549 | IDENTIFIER_POINTER (functionid)); | |
2550 | ||
2551 | /* Write a record describing this implicit function declaration to the | |
2552 | prototypes file (if requested). */ | |
2553 | ||
2554 | gen_aux_info_record (decl, 0, 1, 0); | |
2555 | ||
2556 | pop_obstacks (); | |
2557 | ||
2558 | return decl; | |
2559 | } | |
2560 | ||
2561 | /* Return zero if the declaration NEWDECL is valid | |
2562 | when the declaration OLDDECL (assumed to be for the same name) | |
2563 | has already been seen. | |
2564 | Otherwise return an error message format string with a %s | |
2565 | where the identifier should go. */ | |
2566 | ||
2567 | static char * | |
2568 | redeclaration_error_message (newdecl, olddecl) | |
2569 | tree newdecl, olddecl; | |
2570 | { | |
2571 | if (TREE_CODE (newdecl) == TYPE_DECL) | |
2572 | { | |
2573 | if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl)) | |
2574 | return 0; | |
692ce0fd RK |
2575 | /* pushdecl creates distinct types for TYPE_DECLs by calling |
2576 | build_type_copy, so the above comparison generally fails. We do | |
2577 | another test against the TYPE_MAIN_VARIANT of the olddecl, which | |
2578 | is equivalent to what this code used to do before the build_type_copy | |
2579 | call. The variant type distinction should not matter for traditional | |
2580 | code, because it doesn't have type qualifiers. */ | |
2581 | if (flag_traditional | |
2582 | && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl)) | |
2583 | return 0; | |
4b4e3407 RK |
2584 | if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl)) |
2585 | return 0; | |
51e29401 RS |
2586 | return "redefinition of `%s'"; |
2587 | } | |
2588 | else if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2589 | { | |
2590 | /* Declarations of functions can insist on internal linkage | |
2591 | but they can't be inconsistent with internal linkage, | |
2592 | so there can be no error on that account. | |
2593 | However defining the same name twice is no good. */ | |
2594 | if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0 | |
2595 | /* However, defining once as extern inline and a second | |
2596 | time in another way is ok. */ | |
1394aabd RS |
2597 | && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl) |
2598 | && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl)))) | |
51e29401 RS |
2599 | return "redefinition of `%s'"; |
2600 | return 0; | |
2601 | } | |
2602 | else if (current_binding_level == global_binding_level) | |
2603 | { | |
2604 | /* Objects declared at top level: */ | |
2605 | /* If at least one is a reference, it's ok. */ | |
1394aabd | 2606 | if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl)) |
51e29401 RS |
2607 | return 0; |
2608 | /* Reject two definitions. */ | |
2609 | if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0) | |
2610 | return "redefinition of `%s'"; | |
2611 | /* Now we have two tentative defs, or one tentative and one real def. */ | |
2612 | /* Insist that the linkage match. */ | |
2613 | if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl)) | |
2614 | return "conflicting declarations of `%s'"; | |
2615 | return 0; | |
2616 | } | |
2617 | else if (current_binding_level->parm_flag | |
2618 | && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)) | |
2619 | return 0; | |
2620 | else | |
2621 | { | |
7dcf01c2 JW |
2622 | /* Newdecl has block scope. If olddecl has block scope also, then |
2623 | reject two definitions, and reject a definition together with an | |
2624 | external reference. Otherwise, it is OK, because newdecl must | |
2625 | be an extern reference to olddecl. */ | |
2626 | if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)) | |
cd681d1f | 2627 | && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl)) |
51e29401 RS |
2628 | return "redeclaration of `%s'"; |
2629 | return 0; | |
2630 | } | |
2631 | } | |
2632 | \f | |
2633 | /* Get the LABEL_DECL corresponding to identifier ID as a label. | |
2634 | Create one if none exists so far for the current function. | |
2635 | This function is called for both label definitions and label references. */ | |
2636 | ||
2637 | tree | |
2638 | lookup_label (id) | |
2639 | tree id; | |
2640 | { | |
2641 | register tree decl = IDENTIFIER_LABEL_VALUE (id); | |
2642 | ||
7d9795e5 RS |
2643 | if (current_function_decl == 0) |
2644 | { | |
2645 | error ("label %s referenced outside of any function", | |
2646 | IDENTIFIER_POINTER (id)); | |
2647 | return 0; | |
2648 | } | |
2649 | ||
51e29401 RS |
2650 | /* Use a label already defined or ref'd with this name. */ |
2651 | if (decl != 0) | |
2652 | { | |
2653 | /* But not if it is inherited and wasn't declared to be inheritable. */ | |
2654 | if (DECL_CONTEXT (decl) != current_function_decl | |
2655 | && ! C_DECLARED_LABEL_FLAG (decl)) | |
2656 | return shadow_label (id); | |
2657 | return decl; | |
2658 | } | |
2659 | ||
2660 | decl = build_decl (LABEL_DECL, id, void_type_node); | |
2661 | ||
8fcd361e RS |
2662 | /* Make sure every label has an rtx. */ |
2663 | label_rtx (decl); | |
2664 | ||
51e29401 RS |
2665 | /* A label not explicitly declared must be local to where it's ref'd. */ |
2666 | DECL_CONTEXT (decl) = current_function_decl; | |
2667 | ||
2668 | DECL_MODE (decl) = VOIDmode; | |
2669 | ||
2670 | /* Say where one reference is to the label, | |
2671 | for the sake of the error if it is not defined. */ | |
2672 | DECL_SOURCE_LINE (decl) = lineno; | |
2673 | DECL_SOURCE_FILE (decl) = input_filename; | |
2674 | ||
2675 | IDENTIFIER_LABEL_VALUE (id) = decl; | |
2676 | ||
2677 | named_labels = tree_cons (NULL_TREE, decl, named_labels); | |
2678 | ||
2679 | return decl; | |
2680 | } | |
2681 | ||
2682 | /* Make a label named NAME in the current function, | |
2683 | shadowing silently any that may be inherited from containing functions | |
2684 | or containing scopes. | |
2685 | ||
2686 | Note that valid use, if the label being shadowed | |
2687 | comes from another scope in the same function, | |
2688 | requires calling declare_nonlocal_label right away. */ | |
2689 | ||
2690 | tree | |
2691 | shadow_label (name) | |
2692 | tree name; | |
2693 | { | |
2694 | register tree decl = IDENTIFIER_LABEL_VALUE (name); | |
2695 | ||
2696 | if (decl != 0) | |
2697 | { | |
a784882b RE |
2698 | register tree dup; |
2699 | ||
2700 | /* Check to make sure that the label hasn't already been declared | |
2701 | at this label scope */ | |
2702 | for (dup = named_labels; dup; dup = TREE_CHAIN (dup)) | |
2703 | if (TREE_VALUE (dup) == decl) | |
2704 | { | |
2705 | error ("duplicate label declaration `%s'", | |
2706 | IDENTIFIER_POINTER (name)); | |
2707 | error_with_decl (TREE_VALUE (dup), | |
2708 | "this is a previous declaration"); | |
2709 | /* Just use the previous declaration. */ | |
2710 | return lookup_label (name); | |
2711 | } | |
2712 | ||
51e29401 RS |
2713 | shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels); |
2714 | IDENTIFIER_LABEL_VALUE (name) = decl = 0; | |
2715 | } | |
2716 | ||
2717 | return lookup_label (name); | |
2718 | } | |
2719 | ||
2720 | /* Define a label, specifying the location in the source file. | |
2721 | Return the LABEL_DECL node for the label, if the definition is valid. | |
2722 | Otherwise return 0. */ | |
2723 | ||
2724 | tree | |
2725 | define_label (filename, line, name) | |
2726 | char *filename; | |
2727 | int line; | |
2728 | tree name; | |
2729 | { | |
2730 | tree decl = lookup_label (name); | |
2731 | ||
2732 | /* If label with this name is known from an outer context, shadow it. */ | |
2733 | if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl) | |
2734 | { | |
2735 | shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels); | |
2736 | IDENTIFIER_LABEL_VALUE (name) = 0; | |
2737 | decl = lookup_label (name); | |
2738 | } | |
2739 | ||
2740 | if (DECL_INITIAL (decl) != 0) | |
2741 | { | |
db2e669b | 2742 | error ("duplicate label `%s'", IDENTIFIER_POINTER (name)); |
51e29401 RS |
2743 | return 0; |
2744 | } | |
2745 | else | |
2746 | { | |
2747 | /* Mark label as having been defined. */ | |
2748 | DECL_INITIAL (decl) = error_mark_node; | |
2749 | /* Say where in the source. */ | |
2750 | DECL_SOURCE_FILE (decl) = filename; | |
2751 | DECL_SOURCE_LINE (decl) = line; | |
2752 | return decl; | |
2753 | } | |
2754 | } | |
2755 | \f | |
2756 | /* Return the list of declarations of the current level. | |
2757 | Note that this list is in reverse order unless/until | |
2758 | you nreverse it; and when you do nreverse it, you must | |
2759 | store the result back using `storedecls' or you will lose. */ | |
2760 | ||
2761 | tree | |
2762 | getdecls () | |
2763 | { | |
2764 | return current_binding_level->names; | |
2765 | } | |
2766 | ||
2767 | /* Return the list of type-tags (for structs, etc) of the current level. */ | |
2768 | ||
2769 | tree | |
2770 | gettags () | |
2771 | { | |
2772 | return current_binding_level->tags; | |
2773 | } | |
2774 | ||
2775 | /* Store the list of declarations of the current level. | |
2776 | This is done for the parameter declarations of a function being defined, | |
2777 | after they are modified in the light of any missing parameters. */ | |
2778 | ||
2779 | static void | |
2780 | storedecls (decls) | |
2781 | tree decls; | |
2782 | { | |
2783 | current_binding_level->names = decls; | |
2784 | } | |
2785 | ||
2786 | /* Similarly, store the list of tags of the current level. */ | |
2787 | ||
2788 | static void | |
2789 | storetags (tags) | |
2790 | tree tags; | |
2791 | { | |
2792 | current_binding_level->tags = tags; | |
2793 | } | |
2794 | \f | |
2795 | /* Given NAME, an IDENTIFIER_NODE, | |
2796 | return the structure (or union or enum) definition for that name. | |
2797 | Searches binding levels from BINDING_LEVEL up to the global level. | |
2798 | If THISLEVEL_ONLY is nonzero, searches only the specified context | |
2799 | (but skips any tag-transparent contexts to find one that is | |
2800 | meaningful for tags). | |
2801 | CODE says which kind of type the caller wants; | |
2802 | it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE. | |
2803 | If the wrong kind of type is found, an error is reported. */ | |
2804 | ||
2805 | static tree | |
2806 | lookup_tag (code, name, binding_level, thislevel_only) | |
2807 | enum tree_code code; | |
2808 | struct binding_level *binding_level; | |
2809 | tree name; | |
2810 | int thislevel_only; | |
2811 | { | |
2812 | register struct binding_level *level; | |
2813 | ||
2814 | for (level = binding_level; level; level = level->level_chain) | |
2815 | { | |
2816 | register tree tail; | |
2817 | for (tail = level->tags; tail; tail = TREE_CHAIN (tail)) | |
2818 | { | |
2819 | if (TREE_PURPOSE (tail) == name) | |
2820 | { | |
2821 | if (TREE_CODE (TREE_VALUE (tail)) != code) | |
2822 | { | |
2823 | /* Definition isn't the kind we were looking for. */ | |
2824 | pending_invalid_xref = name; | |
2825 | pending_invalid_xref_file = input_filename; | |
2826 | pending_invalid_xref_line = lineno; | |
2827 | } | |
2828 | return TREE_VALUE (tail); | |
2829 | } | |
2830 | } | |
2831 | if (thislevel_only && ! level->tag_transparent) | |
2832 | return NULL_TREE; | |
2833 | } | |
2834 | return NULL_TREE; | |
2835 | } | |
2836 | ||
2837 | /* Print an error message now | |
2838 | for a recent invalid struct, union or enum cross reference. | |
2839 | We don't print them immediately because they are not invalid | |
2840 | when used in the `struct foo;' construct for shadowing. */ | |
2841 | ||
2842 | void | |
2843 | pending_xref_error () | |
2844 | { | |
2845 | if (pending_invalid_xref != 0) | |
2846 | error_with_file_and_line (pending_invalid_xref_file, | |
2847 | pending_invalid_xref_line, | |
2848 | "`%s' defined as wrong kind of tag", | |
2849 | IDENTIFIER_POINTER (pending_invalid_xref)); | |
2850 | pending_invalid_xref = 0; | |
2851 | } | |
2852 | ||
2853 | /* Given a type, find the tag that was defined for it and return the tag name. | |
2854 | Otherwise return 0. */ | |
2855 | ||
2856 | static tree | |
2857 | lookup_tag_reverse (type) | |
2858 | tree type; | |
2859 | { | |
2860 | register struct binding_level *level; | |
2861 | ||
2862 | for (level = current_binding_level; level; level = level->level_chain) | |
2863 | { | |
2864 | register tree tail; | |
2865 | for (tail = level->tags; tail; tail = TREE_CHAIN (tail)) | |
2866 | { | |
2867 | if (TREE_VALUE (tail) == type) | |
2868 | return TREE_PURPOSE (tail); | |
2869 | } | |
2870 | } | |
2871 | return NULL_TREE; | |
2872 | } | |
2873 | \f | |
2874 | /* Look up NAME in the current binding level and its superiors | |
2875 | in the namespace of variables, functions and typedefs. | |
2876 | Return a ..._DECL node of some kind representing its definition, | |
2877 | or return 0 if it is undefined. */ | |
2878 | ||
2879 | tree | |
2880 | lookup_name (name) | |
2881 | tree name; | |
2882 | { | |
2883 | register tree val; | |
2884 | if (current_binding_level != global_binding_level | |
2885 | && IDENTIFIER_LOCAL_VALUE (name)) | |
2886 | val = IDENTIFIER_LOCAL_VALUE (name); | |
2887 | else | |
2888 | val = IDENTIFIER_GLOBAL_VALUE (name); | |
2889 | return val; | |
2890 | } | |
2891 | ||
2892 | /* Similar to `lookup_name' but look only at current binding level. */ | |
2893 | ||
f062da04 | 2894 | tree |
51e29401 RS |
2895 | lookup_name_current_level (name) |
2896 | tree name; | |
2897 | { | |
2898 | register tree t; | |
2899 | ||
2900 | if (current_binding_level == global_binding_level) | |
2901 | return IDENTIFIER_GLOBAL_VALUE (name); | |
2902 | ||
2903 | if (IDENTIFIER_LOCAL_VALUE (name) == 0) | |
2904 | return 0; | |
2905 | ||
2906 | for (t = current_binding_level->names; t; t = TREE_CHAIN (t)) | |
2907 | if (DECL_NAME (t) == name) | |
2908 | break; | |
2909 | ||
2910 | return t; | |
2911 | } | |
2912 | \f | |
2913 | /* Create the predefined scalar types of C, | |
0f41302f | 2914 | and some nodes representing standard constants (0, 1, (void *) 0). |
51e29401 RS |
2915 | Initialize the global binding level. |
2916 | Make definitions for built-in primitive functions. */ | |
2917 | ||
2918 | void | |
2919 | init_decl_processing () | |
2920 | { | |
2921 | register tree endlink; | |
2922 | /* Either char* or void*. */ | |
2923 | tree traditional_ptr_type_node; | |
f0a45d37 | 2924 | /* Data types of memcpy and strlen. */ |
b71e9de0 | 2925 | tree memcpy_ftype, memset_ftype, strlen_ftype; |
0021b564 | 2926 | tree void_ftype_any, ptr_ftype_void, ptr_ftype_ptr; |
51e29401 RS |
2927 | int wchar_type_size; |
2928 | tree temp; | |
fba9adc6 | 2929 | tree array_domain_type; |
51e29401 RS |
2930 | |
2931 | current_function_decl = NULL; | |
2932 | named_labels = NULL; | |
2933 | current_binding_level = NULL_BINDING_LEVEL; | |
2934 | free_binding_level = NULL_BINDING_LEVEL; | |
2935 | pushlevel (0); /* make the binding_level structure for global names */ | |
2936 | global_binding_level = current_binding_level; | |
2937 | ||
2938 | /* Define `int' and `char' first so that dbx will output them first. */ | |
2939 | ||
2940 | integer_type_node = make_signed_type (INT_TYPE_SIZE); | |
2941 | pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT], | |
2942 | integer_type_node)); | |
2943 | ||
2944 | /* Define `char', which is like either `signed char' or `unsigned char' | |
2945 | but not the same as either. */ | |
2946 | ||
7a0347ff RS |
2947 | char_type_node |
2948 | = (flag_signed_char | |
2949 | ? make_signed_type (CHAR_TYPE_SIZE) | |
2950 | : make_unsigned_type (CHAR_TYPE_SIZE)); | |
51e29401 RS |
2951 | pushdecl (build_decl (TYPE_DECL, get_identifier ("char"), |
2952 | char_type_node)); | |
2953 | ||
2954 | long_integer_type_node = make_signed_type (LONG_TYPE_SIZE); | |
2955 | pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"), | |
2956 | long_integer_type_node)); | |
2957 | ||
2958 | unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE); | |
2959 | pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"), | |
2960 | unsigned_type_node)); | |
2961 | ||
2962 | long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE); | |
2963 | pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"), | |
2964 | long_unsigned_type_node)); | |
2965 | ||
6706083e DE |
2966 | long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE); |
2967 | pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"), | |
2968 | long_long_integer_type_node)); | |
2969 | ||
2970 | long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE); | |
2971 | pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"), | |
2972 | long_long_unsigned_type_node)); | |
2973 | ||
9787ad71 MM |
2974 | short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE); |
2975 | pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"), | |
2976 | short_integer_type_node)); | |
2977 | ||
2978 | short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE); | |
2979 | pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"), | |
2980 | short_unsigned_type_node)); | |
2981 | ||
51e29401 RS |
2982 | /* `unsigned long' is the standard type for sizeof. |
2983 | Traditionally, use a signed type. | |
2984 | Note that stddef.h uses `unsigned long', | |
f8dac6eb R |
2985 | and this must agree, even if long and int are the same size. */ |
2986 | set_sizetype | |
2987 | (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)))); | |
a34731a6 | 2988 | if (flag_traditional && TREE_UNSIGNED (sizetype)) |
f8dac6eb | 2989 | set_sizetype (signed_type (sizetype)); |
51e29401 RS |
2990 | |
2991 | ptrdiff_type_node | |
2992 | = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE))); | |
2993 | ||
51e29401 RS |
2994 | error_mark_node = make_node (ERROR_MARK); |
2995 | TREE_TYPE (error_mark_node) = error_mark_node; | |
2996 | ||
51e29401 RS |
2997 | /* Define both `signed char' and `unsigned char'. */ |
2998 | signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE); | |
2999 | pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"), | |
3000 | signed_char_type_node)); | |
3001 | ||
3002 | unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE); | |
3003 | pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"), | |
3004 | unsigned_char_type_node)); | |
3005 | ||
fa7d8b92 | 3006 | intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode)); |
ac4f24e7 RS |
3007 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node)); |
3008 | ||
fa7d8b92 | 3009 | intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode)); |
ac4f24e7 RS |
3010 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node)); |
3011 | ||
fa7d8b92 | 3012 | intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode)); |
ac4f24e7 RS |
3013 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node)); |
3014 | ||
fa7d8b92 | 3015 | intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode)); |
ac4f24e7 RS |
3016 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node)); |
3017 | ||
a6d7e156 | 3018 | intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode)); |
07fb7f79 | 3019 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node)); |
a6d7e156 | 3020 | |
fa7d8b92 | 3021 | unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode)); |
ac4f24e7 RS |
3022 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node)); |
3023 | ||
fa7d8b92 | 3024 | unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode)); |
ac4f24e7 RS |
3025 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node)); |
3026 | ||
fa7d8b92 | 3027 | unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode)); |
ac4f24e7 RS |
3028 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node)); |
3029 | ||
fa7d8b92 | 3030 | unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode)); |
ac4f24e7 RS |
3031 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node)); |
3032 | ||
a6d7e156 JL |
3033 | unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode)); |
3034 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node)); | |
3035 | ||
51e29401 RS |
3036 | float_type_node = make_node (REAL_TYPE); |
3037 | TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE; | |
3038 | pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT], | |
3039 | float_type_node)); | |
3040 | layout_type (float_type_node); | |
3041 | ||
3042 | double_type_node = make_node (REAL_TYPE); | |
3043 | if (flag_short_double) | |
3044 | TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE; | |
3045 | else | |
3046 | TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE; | |
3047 | pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE], | |
3048 | double_type_node)); | |
3049 | layout_type (double_type_node); | |
3050 | ||
3051 | long_double_type_node = make_node (REAL_TYPE); | |
3052 | TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE; | |
3053 | pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"), | |
3054 | long_double_type_node)); | |
3055 | layout_type (long_double_type_node); | |
3056 | ||
5ab10c42 RS |
3057 | complex_integer_type_node = make_node (COMPLEX_TYPE); |
3058 | pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"), | |
3059 | complex_integer_type_node)); | |
3060 | TREE_TYPE (complex_integer_type_node) = integer_type_node; | |
3061 | layout_type (complex_integer_type_node); | |
3062 | ||
3063 | complex_float_type_node = make_node (COMPLEX_TYPE); | |
3064 | pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"), | |
3065 | complex_float_type_node)); | |
3066 | TREE_TYPE (complex_float_type_node) = float_type_node; | |
3067 | layout_type (complex_float_type_node); | |
3068 | ||
3069 | complex_double_type_node = make_node (COMPLEX_TYPE); | |
3070 | pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"), | |
3071 | complex_double_type_node)); | |
3072 | TREE_TYPE (complex_double_type_node) = double_type_node; | |
3073 | layout_type (complex_double_type_node); | |
3074 | ||
3075 | complex_long_double_type_node = make_node (COMPLEX_TYPE); | |
3076 | pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"), | |
3077 | complex_long_double_type_node)); | |
3078 | TREE_TYPE (complex_long_double_type_node) = long_double_type_node; | |
3079 | layout_type (complex_long_double_type_node); | |
3080 | ||
51e29401 RS |
3081 | wchar_type_node |
3082 | = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE))); | |
3083 | wchar_type_size = TYPE_PRECISION (wchar_type_node); | |
7e4849da RS |
3084 | signed_wchar_type_node = signed_type (wchar_type_node); |
3085 | unsigned_wchar_type_node = unsigned_type (wchar_type_node); | |
51e29401 RS |
3086 | |
3087 | integer_zero_node = build_int_2 (0, 0); | |
3088 | TREE_TYPE (integer_zero_node) = integer_type_node; | |
3089 | integer_one_node = build_int_2 (1, 0); | |
3090 | TREE_TYPE (integer_one_node) = integer_type_node; | |
3091 | ||
f444e553 JM |
3092 | boolean_type_node = integer_type_node; |
3093 | boolean_true_node = integer_one_node; | |
3094 | boolean_false_node = integer_zero_node; | |
3095 | ||
51e29401 RS |
3096 | size_zero_node = build_int_2 (0, 0); |
3097 | TREE_TYPE (size_zero_node) = sizetype; | |
3098 | size_one_node = build_int_2 (1, 0); | |
3099 | TREE_TYPE (size_one_node) = sizetype; | |
3100 | ||
3101 | void_type_node = make_node (VOID_TYPE); | |
3102 | pushdecl (build_decl (TYPE_DECL, | |
3103 | ridpointers[(int) RID_VOID], void_type_node)); | |
3104 | layout_type (void_type_node); /* Uses integer_zero_node */ | |
3105 | /* We are not going to have real types in C with less than byte alignment, | |
3106 | so we might as well not have any types that claim to have it. */ | |
3107 | TYPE_ALIGN (void_type_node) = BITS_PER_UNIT; | |
3108 | ||
3109 | null_pointer_node = build_int_2 (0, 0); | |
3110 | TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node); | |
3111 | layout_type (TREE_TYPE (null_pointer_node)); | |
3112 | ||
3113 | string_type_node = build_pointer_type (char_type_node); | |
3114 | const_string_type_node | |
3115 | = build_pointer_type (build_type_variant (char_type_node, 1, 0)); | |
3116 | ||
fba9adc6 | 3117 | /* Make a type to be the domain of a few array types |
c81fe25d RK |
3118 | whose domains don't really matter. |
3119 | 200 is small enough that it always fits in size_t | |
3120 | and large enough that it can hold most function names for the | |
3121 | initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */ | |
3122 | array_domain_type = build_index_type (build_int_2 (200, 0)); | |
fba9adc6 RS |
3123 | |
3124 | /* make a type for arrays of characters. | |
51e29401 RS |
3125 | With luck nothing will ever really depend on the length of this |
3126 | array type. */ | |
3127 | char_array_type_node | |
fba9adc6 | 3128 | = build_array_type (char_type_node, array_domain_type); |
51e29401 RS |
3129 | /* Likewise for arrays of ints. */ |
3130 | int_array_type_node | |
fba9adc6 | 3131 | = build_array_type (integer_type_node, array_domain_type); |
51e29401 RS |
3132 | /* This is for wide string constants. */ |
3133 | wchar_array_type_node | |
fba9adc6 | 3134 | = build_array_type (wchar_type_node, array_domain_type); |
51e29401 RS |
3135 | |
3136 | default_function_type | |
3137 | = build_function_type (integer_type_node, NULL_TREE); | |
3138 | ||
3139 | ptr_type_node = build_pointer_type (void_type_node); | |
3140 | const_ptr_type_node | |
3141 | = build_pointer_type (build_type_variant (void_type_node, 1, 0)); | |
3142 | ||
3143 | endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE); | |
3144 | ||
9c4614c3 | 3145 | void_ftype_any |
8d9bfdc5 | 3146 | = build_function_type (void_type_node, NULL_TREE); |
9c4614c3 | 3147 | |
732149f9 RK |
3148 | float_ftype_float |
3149 | = build_function_type (float_type_node, | |
3150 | tree_cons (NULL_TREE, float_type_node, endlink)); | |
3151 | ||
51e29401 RS |
3152 | double_ftype_double |
3153 | = build_function_type (double_type_node, | |
3154 | tree_cons (NULL_TREE, double_type_node, endlink)); | |
3155 | ||
732149f9 RK |
3156 | ldouble_ftype_ldouble |
3157 | = build_function_type (long_double_type_node, | |
3158 | tree_cons (NULL_TREE, long_double_type_node, | |
3159 | endlink)); | |
3160 | ||
51e29401 RS |
3161 | double_ftype_double_double |
3162 | = build_function_type (double_type_node, | |
3163 | tree_cons (NULL_TREE, double_type_node, | |
3164 | tree_cons (NULL_TREE, | |
3165 | double_type_node, endlink))); | |
3166 | ||
3167 | int_ftype_int | |
3168 | = build_function_type (integer_type_node, | |
3169 | tree_cons (NULL_TREE, integer_type_node, endlink)); | |
3170 | ||
3171 | long_ftype_long | |
3172 | = build_function_type (long_integer_type_node, | |
3173 | tree_cons (NULL_TREE, | |
3174 | long_integer_type_node, endlink)); | |
3175 | ||
3176 | void_ftype_ptr_ptr_int | |
3177 | = build_function_type (void_type_node, | |
3178 | tree_cons (NULL_TREE, ptr_type_node, | |
3179 | tree_cons (NULL_TREE, ptr_type_node, | |
3180 | tree_cons (NULL_TREE, | |
3181 | integer_type_node, | |
3182 | endlink)))); | |
3183 | ||
3184 | int_ftype_cptr_cptr_sizet | |
3185 | = build_function_type (integer_type_node, | |
3186 | tree_cons (NULL_TREE, const_ptr_type_node, | |
3187 | tree_cons (NULL_TREE, const_ptr_type_node, | |
3188 | tree_cons (NULL_TREE, | |
3189 | sizetype, | |
3190 | endlink)))); | |
3191 | ||
3192 | void_ftype_ptr_int_int | |
3193 | = build_function_type (void_type_node, | |
3194 | tree_cons (NULL_TREE, ptr_type_node, | |
3195 | tree_cons (NULL_TREE, integer_type_node, | |
3196 | tree_cons (NULL_TREE, | |
3197 | integer_type_node, | |
3198 | endlink)))); | |
3199 | ||
3200 | string_ftype_ptr_ptr /* strcpy prototype */ | |
3201 | = build_function_type (string_type_node, | |
3202 | tree_cons (NULL_TREE, string_type_node, | |
3203 | tree_cons (NULL_TREE, | |
3204 | const_string_type_node, | |
3205 | endlink))); | |
3206 | ||
3207 | int_ftype_string_string /* strcmp prototype */ | |
3208 | = build_function_type (integer_type_node, | |
3209 | tree_cons (NULL_TREE, const_string_type_node, | |
3210 | tree_cons (NULL_TREE, | |
3211 | const_string_type_node, | |
3212 | endlink))); | |
3213 | ||
f0a45d37 RS |
3214 | strlen_ftype /* strlen prototype */ |
3215 | = build_function_type (flag_traditional ? integer_type_node : sizetype, | |
51e29401 RS |
3216 | tree_cons (NULL_TREE, const_string_type_node, |
3217 | endlink)); | |
3218 | ||
3219 | traditional_ptr_type_node | |
3220 | = (flag_traditional ? string_type_node : ptr_type_node); | |
3221 | ||
3222 | memcpy_ftype /* memcpy prototype */ | |
3223 | = build_function_type (traditional_ptr_type_node, | |
3224 | tree_cons (NULL_TREE, ptr_type_node, | |
3225 | tree_cons (NULL_TREE, const_ptr_type_node, | |
3226 | tree_cons (NULL_TREE, | |
3227 | sizetype, | |
3228 | endlink)))); | |
3229 | ||
b71e9de0 RK |
3230 | memset_ftype /* memset prototype */ |
3231 | = build_function_type (traditional_ptr_type_node, | |
3232 | tree_cons (NULL_TREE, ptr_type_node, | |
3233 | tree_cons (NULL_TREE, integer_type_node, | |
3234 | tree_cons (NULL_TREE, | |
3235 | sizetype, | |
3236 | endlink)))); | |
3237 | ||
0021b564 JM |
3238 | ptr_ftype_void = build_function_type (ptr_type_node, endlink); |
3239 | ptr_ftype_ptr | |
3240 | = build_function_type (ptr_type_node, | |
3241 | tree_cons (NULL_TREE, ptr_type_node, endlink)); | |
3242 | ||
ccafc85b | 3243 | builtin_function ("__builtin_constant_p", default_function_type, |
8d9bfdc5 | 3244 | BUILT_IN_CONSTANT_P, NULL_PTR); |
51e29401 RS |
3245 | |
3246 | builtin_function ("__builtin_return_address", | |
530fb43c | 3247 | build_function_type (ptr_type_node, |
51e29401 RS |
3248 | tree_cons (NULL_TREE, |
3249 | unsigned_type_node, | |
3250 | endlink)), | |
8d9bfdc5 | 3251 | BUILT_IN_RETURN_ADDRESS, NULL_PTR); |
51e29401 RS |
3252 | |
3253 | builtin_function ("__builtin_frame_address", | |
530fb43c | 3254 | build_function_type (ptr_type_node, |
51e29401 RS |
3255 | tree_cons (NULL_TREE, |
3256 | unsigned_type_node, | |
3257 | endlink)), | |
8d9bfdc5 | 3258 | BUILT_IN_FRAME_ADDRESS, NULL_PTR); |
51e29401 | 3259 | |
18989c57 RK |
3260 | builtin_function ("__builtin_aggregate_incoming_address", |
3261 | build_function_type (ptr_type_node, NULL_TREE), | |
3262 | BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR); | |
3263 | ||
0021b564 JM |
3264 | /* Hooks for the DWARF 2 __throw routine. */ |
3265 | builtin_function ("__builtin_unwind_init", | |
3266 | build_function_type (void_type_node, endlink), | |
3267 | BUILT_IN_UNWIND_INIT, NULL_PTR); | |
3268 | builtin_function ("__builtin_fp", ptr_ftype_void, BUILT_IN_FP, NULL_PTR); | |
3269 | builtin_function ("__builtin_sp", ptr_ftype_void, BUILT_IN_SP, NULL_PTR); | |
3270 | builtin_function ("__builtin_dwarf_fp_regnum", | |
3271 | build_function_type (unsigned_type_node, endlink), | |
3272 | BUILT_IN_DWARF_FP_REGNUM, NULL_PTR); | |
2f3ca9e7 JM |
3273 | builtin_function ("__builtin_dwarf_reg_size", int_ftype_int, |
3274 | BUILT_IN_DWARF_REG_SIZE, NULL_PTR); | |
0021b564 JM |
3275 | builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr, |
3276 | BUILT_IN_FROB_RETURN_ADDR, NULL_PTR); | |
3277 | builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr, | |
3278 | BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR); | |
3279 | builtin_function ("__builtin_set_return_addr_reg", | |
3280 | build_function_type (void_type_node, | |
3281 | tree_cons (NULL_TREE, | |
3282 | ptr_type_node, | |
3283 | endlink)), | |
3284 | BUILT_IN_SET_RETURN_ADDR_REG, NULL_PTR); | |
a1622f83 AM |
3285 | builtin_function ("__builtin_eh_stub_old", ptr_ftype_void, |
3286 | BUILT_IN_EH_STUB_OLD, NULL_PTR); | |
0021b564 JM |
3287 | builtin_function ("__builtin_eh_stub", ptr_ftype_void, |
3288 | BUILT_IN_EH_STUB, NULL_PTR); | |
3289 | builtin_function | |
3290 | ("__builtin_set_eh_regs", | |
3291 | build_function_type (void_type_node, | |
3292 | tree_cons (NULL_TREE, ptr_type_node, | |
3293 | tree_cons (NULL_TREE, | |
3294 | type_for_mode (ptr_mode, 0), | |
3295 | endlink))), | |
3296 | BUILT_IN_SET_EH_REGS, NULL_PTR); | |
3297 | ||
51e29401 RS |
3298 | builtin_function ("__builtin_alloca", |
3299 | build_function_type (ptr_type_node, | |
3300 | tree_cons (NULL_TREE, | |
3301 | sizetype, | |
3302 | endlink)), | |
3303 | BUILT_IN_ALLOCA, "alloca"); | |
1f53ee05 RS |
3304 | builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR); |
3305 | /* Define alloca, ffs as builtins. | |
3306 | Declare _exit just to mark it as volatile. */ | |
fc3ffe83 | 3307 | if (! flag_no_builtin && !flag_no_nonansi_builtin) |
51e29401 | 3308 | { |
51e29401 RS |
3309 | temp = builtin_function ("alloca", |
3310 | build_function_type (ptr_type_node, | |
3311 | tree_cons (NULL_TREE, | |
3312 | sizetype, | |
3313 | endlink)), | |
8d9bfdc5 | 3314 | BUILT_IN_ALLOCA, NULL_PTR); |
51e29401 RS |
3315 | /* Suppress error if redefined as a non-function. */ |
3316 | DECL_BUILT_IN_NONANSI (temp) = 1; | |
1f53ee05 RS |
3317 | temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR); |
3318 | /* Suppress error if redefined as a non-function. */ | |
3319 | DECL_BUILT_IN_NONANSI (temp) = 1; | |
8d9bfdc5 RK |
3320 | temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN, |
3321 | NULL_PTR); | |
51e29401 RS |
3322 | TREE_THIS_VOLATILE (temp) = 1; |
3323 | TREE_SIDE_EFFECTS (temp) = 1; | |
3324 | /* Suppress error if redefined as a non-function. */ | |
3325 | DECL_BUILT_IN_NONANSI (temp) = 1; | |
3326 | } | |
3327 | ||
8d9bfdc5 | 3328 | builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR); |
732149f9 RK |
3329 | builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS, |
3330 | NULL_PTR); | |
8d9bfdc5 RK |
3331 | builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS, |
3332 | NULL_PTR); | |
732149f9 RK |
3333 | builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS, |
3334 | NULL_PTR); | |
8d9bfdc5 RK |
3335 | builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS, |
3336 | NULL_PTR); | |
530fb43c RK |
3337 | builtin_function ("__builtin_saveregs", |
3338 | build_function_type (ptr_type_node, NULL_TREE), | |
8d9bfdc5 | 3339 | BUILT_IN_SAVEREGS, NULL_PTR); |
51e29401 RS |
3340 | /* EXPAND_BUILTIN_VARARGS is obsolete. */ |
3341 | #if 0 | |
3342 | builtin_function ("__builtin_varargs", | |
3343 | build_function_type (ptr_type_node, | |
3344 | tree_cons (NULL_TREE, | |
3345 | integer_type_node, | |
3346 | endlink)), | |
8d9bfdc5 | 3347 | BUILT_IN_VARARGS, NULL_PTR); |
51e29401 RS |
3348 | #endif |
3349 | builtin_function ("__builtin_classify_type", default_function_type, | |
8d9bfdc5 | 3350 | BUILT_IN_CLASSIFY_TYPE, NULL_PTR); |
51e29401 | 3351 | builtin_function ("__builtin_next_arg", |
8d0aed47 | 3352 | build_function_type (ptr_type_node, NULL_TREE), |
8d9bfdc5 | 3353 | BUILT_IN_NEXT_ARG, NULL_PTR); |
51e29401 RS |
3354 | builtin_function ("__builtin_args_info", |
3355 | build_function_type (integer_type_node, | |
3356 | tree_cons (NULL_TREE, | |
3357 | integer_type_node, | |
3358 | endlink)), | |
8d9bfdc5 | 3359 | BUILT_IN_ARGS_INFO, NULL_PTR); |
51e29401 | 3360 | |
efb99317 TW |
3361 | /* Untyped call and return. */ |
3362 | builtin_function ("__builtin_apply_args", | |
3363 | build_function_type (ptr_type_node, NULL_TREE), | |
3364 | BUILT_IN_APPLY_ARGS, NULL_PTR); | |
3365 | ||
3366 | temp = tree_cons (NULL_TREE, | |
3367 | build_pointer_type (build_function_type (void_type_node, | |
3368 | NULL_TREE)), | |
3369 | tree_cons (NULL_TREE, | |
3370 | ptr_type_node, | |
3371 | tree_cons (NULL_TREE, | |
e09d75bd | 3372 | sizetype, |
efb99317 TW |
3373 | endlink))); |
3374 | builtin_function ("__builtin_apply", | |
3375 | build_function_type (ptr_type_node, temp), | |
3376 | BUILT_IN_APPLY, NULL_PTR); | |
3377 | builtin_function ("__builtin_return", | |
3378 | build_function_type (void_type_node, | |
3379 | tree_cons (NULL_TREE, | |
3380 | ptr_type_node, | |
3381 | endlink)), | |
3382 | BUILT_IN_RETURN, NULL_PTR); | |
3383 | ||
51e29401 RS |
3384 | /* Currently under experimentation. */ |
3385 | builtin_function ("__builtin_memcpy", memcpy_ftype, | |
3386 | BUILT_IN_MEMCPY, "memcpy"); | |
3387 | builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet, | |
3388 | BUILT_IN_MEMCMP, "memcmp"); | |
b71e9de0 | 3389 | builtin_function ("__builtin_memset", memset_ftype, |
6c174fc0 | 3390 | BUILT_IN_MEMSET, "memset"); |
51e29401 RS |
3391 | builtin_function ("__builtin_strcmp", int_ftype_string_string, |
3392 | BUILT_IN_STRCMP, "strcmp"); | |
3393 | builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr, | |
3394 | BUILT_IN_STRCPY, "strcpy"); | |
f0a45d37 | 3395 | builtin_function ("__builtin_strlen", strlen_ftype, |
51e29401 | 3396 | BUILT_IN_STRLEN, "strlen"); |
732149f9 RK |
3397 | builtin_function ("__builtin_sqrtf", float_ftype_float, |
3398 | BUILT_IN_FSQRT, "sqrtf"); | |
929f3671 RS |
3399 | builtin_function ("__builtin_fsqrt", double_ftype_double, |
3400 | BUILT_IN_FSQRT, "sqrt"); | |
732149f9 RK |
3401 | builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble, |
3402 | BUILT_IN_FSQRT, "sqrtl"); | |
3403 | builtin_function ("__builtin_sinf", float_ftype_float, | |
3404 | BUILT_IN_SIN, "sinf"); | |
96a1b3af JVA |
3405 | builtin_function ("__builtin_sin", double_ftype_double, |
3406 | BUILT_IN_SIN, "sin"); | |
732149f9 RK |
3407 | builtin_function ("__builtin_sinl", ldouble_ftype_ldouble, |
3408 | BUILT_IN_SIN, "sinl"); | |
3409 | builtin_function ("__builtin_cosf", float_ftype_float, | |
3410 | BUILT_IN_COS, "cosf"); | |
96a1b3af JVA |
3411 | builtin_function ("__builtin_cos", double_ftype_double, |
3412 | BUILT_IN_COS, "cos"); | |
732149f9 RK |
3413 | builtin_function ("__builtin_cosl", ldouble_ftype_ldouble, |
3414 | BUILT_IN_COS, "cosl"); | |
091480e5 RK |
3415 | builtin_function ("__builtin_setjmp", |
3416 | build_function_type (integer_type_node, | |
3417 | tree_cons (NULL_TREE, | |
3418 | ptr_type_node, endlink)), | |
3419 | BUILT_IN_SETJMP, NULL_PTR); | |
3420 | builtin_function ("__builtin_longjmp", | |
3421 | build_function_type | |
3422 | (void_type_node, | |
3423 | tree_cons (NULL, ptr_type_node, | |
3424 | tree_cons (NULL_TREE, | |
3425 | integer_type_node, | |
3426 | endlink))), | |
3427 | BUILT_IN_LONGJMP, NULL_PTR); | |
96a1b3af | 3428 | |
51e29401 RS |
3429 | /* In an ANSI C program, it is okay to supply built-in meanings |
3430 | for these functions, since applications cannot validly use them | |
3431 | with any other meaning. | |
9e3c9e1b RS |
3432 | However, honor the -fno-builtin option. */ |
3433 | if (!flag_no_builtin) | |
51e29401 | 3434 | { |
8d9bfdc5 | 3435 | builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR); |
732149f9 | 3436 | builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR); |
8d9bfdc5 | 3437 | builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR); |
732149f9 RK |
3438 | builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS, |
3439 | NULL_PTR); | |
8d9bfdc5 RK |
3440 | builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR); |
3441 | builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR); | |
3442 | builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP, | |
3443 | NULL_PTR); | |
b71e9de0 | 3444 | builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET, NULL_PTR); |
8d9bfdc5 RK |
3445 | builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP, |
3446 | NULL_PTR); | |
3447 | builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY, | |
3448 | NULL_PTR); | |
3449 | builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR); | |
732149f9 | 3450 | builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR); |
8d9bfdc5 | 3451 | builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR); |
732149f9 RK |
3452 | builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT, |
3453 | NULL_PTR); | |
3454 | builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR); | |
96a1b3af | 3455 | builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR); |
732149f9 RK |
3456 | builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR); |
3457 | builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR); | |
96a1b3af | 3458 | builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR); |
732149f9 | 3459 | builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR); |
9e3c9e1b RS |
3460 | |
3461 | /* Declare these functions volatile | |
3462 | to avoid spurious "control drops through" warnings. */ | |
3463 | /* Don't specify the argument types, to avoid errors | |
3464 | from certain code which isn't valid in ANSI but which exists. */ | |
8d9bfdc5 RK |
3465 | temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN, |
3466 | NULL_PTR); | |
9e3c9e1b RS |
3467 | TREE_THIS_VOLATILE (temp) = 1; |
3468 | TREE_SIDE_EFFECTS (temp) = 1; | |
8d9bfdc5 | 3469 | temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR); |
9e3c9e1b RS |
3470 | TREE_THIS_VOLATILE (temp) = 1; |
3471 | TREE_SIDE_EFFECTS (temp) = 1; | |
51e29401 RS |
3472 | } |
3473 | ||
3474 | #if 0 | |
3475 | /* Support for these has not been written in either expand_builtin | |
3476 | or build_function_call. */ | |
8d9bfdc5 RK |
3477 | builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR); |
3478 | builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR); | |
3479 | builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR, | |
3480 | NULL_PTR); | |
3481 | builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL, | |
3482 | NULL_PTR); | |
3483 | builtin_function ("__builtin_fmod", double_ftype_double_double, | |
3484 | BUILT_IN_FMOD, NULL_PTR); | |
3485 | builtin_function ("__builtin_frem", double_ftype_double_double, | |
3486 | BUILT_IN_FREM, NULL_PTR); | |
8d9bfdc5 RK |
3487 | builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP, |
3488 | NULL_PTR); | |
3489 | builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN, | |
3490 | NULL_PTR); | |
51e29401 RS |
3491 | #endif |
3492 | ||
f444e553 JM |
3493 | pedantic_lvalues = pedantic; |
3494 | ||
b032c74c | 3495 | /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */ |
7da551a2 | 3496 | declare_function_name (); |
64309441 | 3497 | |
51e29401 RS |
3498 | start_identifier_warnings (); |
3499 | ||
561d994f RK |
3500 | /* Prepare to check format strings against argument lists. */ |
3501 | init_function_format_info (); | |
75621238 RS |
3502 | |
3503 | init_iterators (); | |
b4892310 RS |
3504 | |
3505 | incomplete_decl_finalize_hook = finish_incomplete_decl; | |
51e29401 RS |
3506 | } |
3507 | ||
3508 | /* Return a definition for a builtin function named NAME and whose data type | |
3509 | is TYPE. TYPE should be a function type with argument types. | |
3510 | FUNCTION_CODE tells later passes how to compile calls to this function. | |
3511 | See tree.h for its possible values. | |
3512 | ||
3513 | If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME, | |
3514 | the name to be called if we can't opencode the function. */ | |
3515 | ||
929f3671 | 3516 | tree |
51e29401 RS |
3517 | builtin_function (name, type, function_code, library_name) |
3518 | char *name; | |
3519 | tree type; | |
3520 | enum built_in_function function_code; | |
3521 | char *library_name; | |
3522 | { | |
3523 | tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type); | |
1394aabd | 3524 | DECL_EXTERNAL (decl) = 1; |
51e29401 | 3525 | TREE_PUBLIC (decl) = 1; |
9a509bfe RS |
3526 | /* If -traditional, permit redefining a builtin function any way you like. |
3527 | (Though really, if the program redefines these functions, | |
3528 | it probably won't work right unless compiled with -fno-builtin.) */ | |
3529 | if (flag_traditional && name[0] != '_') | |
3530 | DECL_BUILT_IN_NONANSI (decl) = 1; | |
51e29401 RS |
3531 | if (library_name) |
3532 | DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name); | |
8d9bfdc5 | 3533 | make_decl_rtl (decl, NULL_PTR, 1); |
51e29401 RS |
3534 | pushdecl (decl); |
3535 | if (function_code != NOT_BUILT_IN) | |
3536 | { | |
3537 | DECL_BUILT_IN (decl) = 1; | |
678566a5 | 3538 | DECL_FUNCTION_CODE (decl) = function_code; |
51e29401 | 3539 | } |
6b19af32 RS |
3540 | /* Warn if a function in the namespace for users |
3541 | is used without an occasion to consider it declared. */ | |
3542 | if (name[0] != '_' || name[1] != '_') | |
3543 | C_DECL_ANTICIPATED (decl) = 1; | |
51e29401 RS |
3544 | |
3545 | return decl; | |
3546 | } | |
3547 | \f | |
3548 | /* Called when a declaration is seen that contains no names to declare. | |
3549 | If its type is a reference to a structure, union or enum inherited | |
3550 | from a containing scope, shadow that tag name for the current scope | |
3551 | with a forward reference. | |
3552 | If its type defines a new named structure or union | |
3553 | or defines an enum, it is valid but we need not do anything here. | |
3554 | Otherwise, it is an error. */ | |
3555 | ||
3556 | void | |
3557 | shadow_tag (declspecs) | |
3558 | tree declspecs; | |
9282f2f9 RS |
3559 | { |
3560 | shadow_tag_warned (declspecs, 0); | |
3561 | } | |
3562 | ||
3563 | void | |
3564 | shadow_tag_warned (declspecs, warned) | |
3565 | tree declspecs; | |
3566 | int warned; | |
773edaef RK |
3567 | /* 1 => we have done a pedwarn. 2 => we have done a warning, but |
3568 | no pedwarn. */ | |
51e29401 RS |
3569 | { |
3570 | int found_tag = 0; | |
51e29401 | 3571 | register tree link; |
d9525bec | 3572 | tree specs, attrs; |
51e29401 RS |
3573 | |
3574 | pending_invalid_xref = 0; | |
3575 | ||
d9525bec BK |
3576 | /* Remove the attributes from declspecs, since they will confuse the |
3577 | following code. */ | |
3578 | split_specs_attrs (declspecs, &specs, &attrs); | |
3579 | ||
51e29401 RS |
3580 | for (link = declspecs; link; link = TREE_CHAIN (link)) |
3581 | { | |
3582 | register tree value = TREE_VALUE (link); | |
3583 | register enum tree_code code = TREE_CODE (value); | |
3584 | ||
3585 | if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE) | |
3586 | /* Used to test also that TYPE_SIZE (value) != 0. | |
3587 | That caused warning for `struct foo;' at top level in the file. */ | |
3588 | { | |
3589 | register tree name = lookup_tag_reverse (value); | |
3590 | register tree t; | |
3591 | ||
3592 | found_tag++; | |
3593 | ||
3594 | if (name == 0) | |
3595 | { | |
773edaef RK |
3596 | if (warned != 1 && code != ENUMERAL_TYPE) |
3597 | /* Empty unnamed enum OK */ | |
51e29401 RS |
3598 | { |
3599 | pedwarn ("unnamed struct/union that defines no instances"); | |
3600 | warned = 1; | |
3601 | } | |
3602 | } | |
3603 | else | |
3604 | { | |
3605 | t = lookup_tag (code, name, current_binding_level, 1); | |
3606 | ||
3607 | if (t == 0) | |
3608 | { | |
3609 | t = make_node (code); | |
3610 | pushtag (name, t); | |
3611 | } | |
3612 | } | |
3613 | } | |
3614 | else | |
3615 | { | |
efffbf71 | 3616 | if (!warned && ! in_system_header) |
773edaef RK |
3617 | { |
3618 | warning ("useless keyword or type name in empty declaration"); | |
3619 | warned = 2; | |
3620 | } | |
51e29401 RS |
3621 | } |
3622 | } | |
3623 | ||
773edaef RK |
3624 | if (found_tag > 1) |
3625 | error ("two types specified in one empty declaration"); | |
3626 | ||
3627 | if (warned != 1) | |
51e29401 | 3628 | { |
51e29401 RS |
3629 | if (found_tag == 0) |
3630 | pedwarn ("empty declaration"); | |
3631 | } | |
3632 | } | |
3633 | \f | |
3634 | /* Decode a "typename", such as "int **", returning a ..._TYPE node. */ | |
3635 | ||
3636 | tree | |
3637 | groktypename (typename) | |
3638 | tree typename; | |
3639 | { | |
3640 | if (TREE_CODE (typename) != TREE_LIST) | |
3641 | return typename; | |
3642 | return grokdeclarator (TREE_VALUE (typename), | |
3643 | TREE_PURPOSE (typename), | |
3644 | TYPENAME, 0); | |
3645 | } | |
3646 | ||
3647 | /* Return a PARM_DECL node for a given pair of specs and declarator. */ | |
3648 | ||
3649 | tree | |
3650 | groktypename_in_parm_context (typename) | |
3651 | tree typename; | |
3652 | { | |
3653 | if (TREE_CODE (typename) != TREE_LIST) | |
3654 | return typename; | |
3655 | return grokdeclarator (TREE_VALUE (typename), | |
3656 | TREE_PURPOSE (typename), | |
3657 | PARM, 0); | |
3658 | } | |
3659 | ||
3660 | /* Decode a declarator in an ordinary declaration or data definition. | |
3661 | This is called as soon as the type information and variable name | |
3662 | have been parsed, before parsing the initializer if any. | |
3663 | Here we create the ..._DECL node, fill in its type, | |
3664 | and put it on the list of decls for the current context. | |
3665 | The ..._DECL node is returned as the value. | |
3666 | ||
3667 | Exception: for arrays where the length is not specified, | |
3668 | the type is left null, to be filled in by `finish_decl'. | |
3669 | ||
3670 | Function definitions do not come here; they go to start_function | |
3671 | instead. However, external and forward declarations of functions | |
3672 | do go through here. Structure field declarations are done by | |
3673 | grokfield and not through here. */ | |
3674 | ||
3675 | /* Set this to zero to debug not using the temporary obstack | |
3676 | to parse initializers. */ | |
3677 | int debug_temp_inits = 1; | |
3678 | ||
3679 | tree | |
daa6d5ff | 3680 | start_decl (declarator, declspecs, initialized, attributes, prefix_attributes) |
eaa81144 | 3681 | tree declarator, declspecs; |
51e29401 | 3682 | int initialized; |
daa6d5ff | 3683 | tree attributes, prefix_attributes; |
51e29401 RS |
3684 | { |
3685 | register tree decl = grokdeclarator (declarator, declspecs, | |
3686 | NORMAL, initialized); | |
3687 | register tree tem; | |
3688 | int init_written = initialized; | |
3689 | ||
3690 | /* The corresponding pop_obstacks is in finish_decl. */ | |
3691 | push_obstacks_nochange (); | |
3692 | ||
b8705e61 RK |
3693 | if (warn_main && !strcmp (IDENTIFIER_POINTER (declarator), "main")) |
3694 | warning_with_decl (decl, "`%s' is usually a function"); | |
3695 | ||
51e29401 RS |
3696 | if (initialized) |
3697 | /* Is it valid for this decl to have an initializer at all? | |
3698 | If not, set INITIALIZED to zero, which will indirectly | |
3699 | tell `finish_decl' to ignore the initializer once it is parsed. */ | |
3700 | switch (TREE_CODE (decl)) | |
3701 | { | |
3702 | case TYPE_DECL: | |
3703 | /* typedef foo = bar means give foo the same type as bar. | |
3704 | We haven't parsed bar yet, so `finish_decl' will fix that up. | |
3705 | Any other case of an initialization in a TYPE_DECL is an error. */ | |
3706 | if (pedantic || list_length (declspecs) > 1) | |
3707 | { | |
3708 | error ("typedef `%s' is initialized", | |
3709 | IDENTIFIER_POINTER (DECL_NAME (decl))); | |
3710 | initialized = 0; | |
3711 | } | |
3712 | break; | |
3713 | ||
3714 | case FUNCTION_DECL: | |
3715 | error ("function `%s' is initialized like a variable", | |
3716 | IDENTIFIER_POINTER (DECL_NAME (decl))); | |
3717 | initialized = 0; | |
3718 | break; | |
3719 | ||
3720 | case PARM_DECL: | |
3721 | /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */ | |
3722 | error ("parameter `%s' is initialized", | |
3723 | IDENTIFIER_POINTER (DECL_NAME (decl))); | |
3724 | initialized = 0; | |
3725 | break; | |
3726 | ||
3727 | default: | |
3728 | /* Don't allow initializations for incomplete types | |
3729 | except for arrays which might be completed by the initialization. */ | |
3730 | if (TYPE_SIZE (TREE_TYPE (decl)) != 0) | |
3731 | { | |
3732 | /* A complete type is ok if size is fixed. */ | |
3733 | ||
3734 | if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST | |
3735 | || C_DECL_VARIABLE_SIZE (decl)) | |
3736 | { | |
3737 | error ("variable-sized object may not be initialized"); | |
3738 | initialized = 0; | |
3739 | } | |
3740 | } | |
3741 | else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE) | |
3742 | { | |
3743 | error ("variable `%s' has initializer but incomplete type", | |
3744 | IDENTIFIER_POINTER (DECL_NAME (decl))); | |
3745 | initialized = 0; | |
3746 | } | |
3747 | else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0) | |
3748 | { | |
3749 | error ("elements of array `%s' have incomplete type", | |
3750 | IDENTIFIER_POINTER (DECL_NAME (decl))); | |
3751 | initialized = 0; | |
3752 | } | |
3753 | } | |
3754 | ||
3755 | if (initialized) | |
3756 | { | |
3757 | #if 0 /* Seems redundant with grokdeclarator. */ | |
3758 | if (current_binding_level != global_binding_level | |
1394aabd | 3759 | && DECL_EXTERNAL (decl) |
51e29401 RS |
3760 | && TREE_CODE (decl) != FUNCTION_DECL) |
3761 | warning ("declaration of `%s' has `extern' and is initialized", | |
3762 | IDENTIFIER_POINTER (DECL_NAME (decl))); | |
3763 | #endif | |
1394aabd | 3764 | DECL_EXTERNAL (decl) = 0; |
51e29401 RS |
3765 | if (current_binding_level == global_binding_level) |
3766 | TREE_STATIC (decl) = 1; | |
3767 | ||
3768 | /* Tell `pushdecl' this is an initialized decl | |
3769 | even though we don't yet have the initializer expression. | |
3770 | Also tell `finish_decl' it may store the real initializer. */ | |
3771 | DECL_INITIAL (decl) = error_mark_node; | |
3772 | } | |
3773 | ||
3774 | /* If this is a function declaration, write a record describing it to the | |
3775 | prototypes file (if requested). */ | |
3776 | ||
3777 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
3778 | gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0); | |
3779 | ||
2786cbad JM |
3780 | /* ANSI specifies that a tentative definition which is not merged with |
3781 | a non-tentative definition behaves exactly like a definition with an | |
3782 | initializer equal to zero. (Section 3.7.2) | |
3783 | -fno-common gives strict ANSI behavior. Usually you don't want it. | |
3784 | This matters only for variables with external linkage. */ | |
f537695d | 3785 | if (! flag_no_common || ! TREE_PUBLIC (decl)) |
2786cbad | 3786 | DECL_COMMON (decl) = 1; |
8615176a | 3787 | |
daa6d5ff RK |
3788 | /* Set attributes here so if duplicate decl, will have proper attributes. */ |
3789 | decl_attributes (decl, attributes, prefix_attributes); | |
3790 | ||
51e29401 RS |
3791 | /* Add this decl to the current binding level. |
3792 | TEM may equal DECL or it may be a previous decl of the same name. */ | |
3793 | tem = pushdecl (decl); | |
3794 | ||
3795 | /* For a local variable, define the RTL now. */ | |
3796 | if (current_binding_level != global_binding_level | |
3797 | /* But not if this is a duplicate decl | |
3798 | and we preserved the rtl from the previous one | |
3799 | (which may or may not happen). */ | |
3800 | && DECL_RTL (tem) == 0) | |
3801 | { | |
3802 | if (TYPE_SIZE (TREE_TYPE (tem)) != 0) | |
3803 | expand_decl (tem); | |
3804 | else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE | |
3805 | && DECL_INITIAL (tem) != 0) | |
3806 | expand_decl (tem); | |
3807 | } | |
3808 | ||
3809 | if (init_written) | |
3810 | { | |
3811 | /* When parsing and digesting the initializer, | |
3812 | use temporary storage. Do this even if we will ignore the value. */ | |
3813 | if (current_binding_level == global_binding_level && debug_temp_inits) | |
3814 | temporary_allocation (); | |
3815 | } | |
3816 | ||
3817 | return tem; | |
3818 | } | |
3819 | ||
3820 | /* Finish processing of a declaration; | |
3821 | install its initial value. | |
3822 | If the length of an array type is not known before, | |
3823 | it must be determined now, from the initial value, or it is an error. */ | |
3824 | ||
3825 | void | |
3826 | finish_decl (decl, init, asmspec_tree) | |
3827 | tree decl, init; | |
3828 | tree asmspec_tree; | |
3829 | { | |
3830 | register tree type = TREE_TYPE (decl); | |
3831 | int was_incomplete = (DECL_SIZE (decl) == 0); | |
3832 | int temporary = allocation_temporary_p (); | |
3833 | char *asmspec = 0; | |
3834 | ||
72f5a12b | 3835 | /* If a name was specified, get the string. */ |
51e29401 | 3836 | if (asmspec_tree) |
72f5a12b | 3837 | asmspec = TREE_STRING_POINTER (asmspec_tree); |
51e29401 RS |
3838 | |
3839 | /* If `start_decl' didn't like having an initialization, ignore it now. */ | |
3840 | ||
3841 | if (init != 0 && DECL_INITIAL (decl) == 0) | |
3842 | init = 0; | |
3843 | /* Don't crash if parm is initialized. */ | |
3844 | if (TREE_CODE (decl) == PARM_DECL) | |
3845 | init = 0; | |
3846 | ||
519d591f RS |
3847 | if (ITERATOR_P (decl)) |
3848 | { | |
3849 | if (init == 0) | |
3850 | error_with_decl (decl, "iterator has no initial value"); | |
3851 | else | |
3852 | init = save_expr (init); | |
3853 | } | |
3854 | ||
51e29401 RS |
3855 | if (init) |
3856 | { | |
3857 | if (TREE_CODE (decl) != TYPE_DECL) | |
3858 | store_init_value (decl, init); | |
3859 | else | |
3860 | { | |
3861 | /* typedef foo = bar; store the type of bar as the type of foo. */ | |
3862 | TREE_TYPE (decl) = TREE_TYPE (init); | |
3863 | DECL_INITIAL (decl) = init = 0; | |
3864 | } | |
3865 | } | |
3866 | ||
7a0347ff RS |
3867 | /* Pop back to the obstack that is current for this binding level. |
3868 | This is because MAXINDEX, rtl, etc. to be made below | |
3869 | must go in the permanent obstack. But don't discard the | |
51e29401 | 3870 | temporary data yet. */ |
7a0347ff RS |
3871 | pop_obstacks (); |
3872 | #if 0 /* pop_obstacks was near the end; this is what was here. */ | |
51e29401 RS |
3873 | if (current_binding_level == global_binding_level && temporary) |
3874 | end_temporary_allocation (); | |
7a0347ff | 3875 | #endif |
51e29401 RS |
3876 | |
3877 | /* Deduce size of array from initialization, if not already known */ | |
3878 | ||
3879 | if (TREE_CODE (type) == ARRAY_TYPE | |
3880 | && TYPE_DOMAIN (type) == 0 | |
3881 | && TREE_CODE (decl) != TYPE_DECL) | |
3882 | { | |
3883 | int do_default | |
3884 | = (TREE_STATIC (decl) | |
3885 | /* Even if pedantic, an external linkage array | |
3886 | may have incomplete type at first. */ | |
3887 | ? pedantic && !TREE_PUBLIC (decl) | |
1394aabd | 3888 | : !DECL_EXTERNAL (decl)); |
51e29401 RS |
3889 | int failure |
3890 | = complete_array_type (type, DECL_INITIAL (decl), do_default); | |
3891 | ||
3892 | /* Get the completed type made by complete_array_type. */ | |
3893 | type = TREE_TYPE (decl); | |
3894 | ||
3895 | if (failure == 1) | |
3896 | error_with_decl (decl, "initializer fails to determine size of `%s'"); | |
3897 | ||
3898 | if (failure == 2) | |
3899 | { | |
3900 | if (do_default) | |
3901 | error_with_decl (decl, "array size missing in `%s'"); | |
b4892310 RS |
3902 | /* If a `static' var's size isn't known, |
3903 | make it extern as well as static, so it does not get | |
3904 | allocated. | |
3905 | If it is not `static', then do not mark extern; | |
3906 | finish_incomplete_decl will give it a default size | |
3907 | and it will get allocated. */ | |
3908 | else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl)) | |
1394aabd | 3909 | DECL_EXTERNAL (decl) = 1; |
51e29401 RS |
3910 | } |
3911 | ||
7e44eda6 JW |
3912 | /* TYPE_MAX_VALUE is always one less than the number of elements |
3913 | in the array, because we start counting at zero. Therefore, | |
3914 | warn only if the value is less than zero. */ | |
51e29401 | 3915 | if (pedantic && TYPE_DOMAIN (type) != 0 |
7e44eda6 | 3916 | && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0) |
6aa10371 | 3917 | error_with_decl (decl, "zero or negative size array `%s'"); |
51e29401 RS |
3918 | |
3919 | layout_decl (decl, 0); | |
3920 | } | |
3921 | ||
3922 | if (TREE_CODE (decl) == VAR_DECL) | |
3923 | { | |
d575f110 RS |
3924 | if (DECL_SIZE (decl) == 0 |
3925 | && TYPE_SIZE (TREE_TYPE (decl)) != 0) | |
3926 | layout_decl (decl, 0); | |
3927 | ||
a7f64d52 RS |
3928 | if (DECL_SIZE (decl) == 0 |
3929 | && (TREE_STATIC (decl) | |
3930 | ? | |
3931 | /* A static variable with an incomplete type | |
f3b4fb6e | 3932 | is an error if it is initialized. |
70efc776 | 3933 | Also if it is not file scope. |
a7f64d52 RS |
3934 | Otherwise, let it through, but if it is not `extern' |
3935 | then it may cause an error message later. */ | |
e3b776dc RK |
3936 | /* A duplicate_decls call could have changed an extern |
3937 | declaration into a file scope one. This can be detected | |
3938 | by TREE_ASM_WRITTEN being set. */ | |
3939 | (DECL_INITIAL (decl) != 0 | |
1d300e19 | 3940 | || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl))) |
a7f64d52 RS |
3941 | : |
3942 | /* An automatic variable with an incomplete type | |
3943 | is an error. */ | |
70038ec9 | 3944 | !DECL_EXTERNAL (decl))) |
51e29401 | 3945 | { |
51e29401 RS |
3946 | error_with_decl (decl, "storage size of `%s' isn't known"); |
3947 | TREE_TYPE (decl) = error_mark_node; | |
3948 | } | |
3949 | ||
1394aabd | 3950 | if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl)) |
90374cc2 | 3951 | && DECL_SIZE (decl) != 0) |
e681c5a1 RS |
3952 | { |
3953 | if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST) | |
3954 | constant_expression_warning (DECL_SIZE (decl)); | |
3955 | else | |
3956 | error_with_decl (decl, "storage size of `%s' isn't constant"); | |
3957 | } | |
e9a25f70 JL |
3958 | |
3959 | if (TREE_USED (type)) | |
3960 | TREE_USED (decl) = 1; | |
51e29401 RS |
3961 | } |
3962 | ||
3c4afaa5 | 3963 | /* If this is a function and an assembler name is specified, it isn't |
72f5a12b RK |
3964 | builtin any more. Also reset DECL_RTL so we can give it its new |
3965 | name. */ | |
3c4afaa5 | 3966 | if (TREE_CODE (decl) == FUNCTION_DECL && asmspec) |
72f5a12b RK |
3967 | { |
3968 | DECL_BUILT_IN (decl) = 0; | |
3969 | DECL_RTL (decl) = 0; | |
3970 | } | |
3c4afaa5 | 3971 | |
51e29401 RS |
3972 | /* Output the assembler code and/or RTL code for variables and functions, |
3973 | unless the type is an undefined structure or union. | |
3974 | If not, it will get done when the type is completed. */ | |
3975 | ||
3976 | if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL) | |
3977 | { | |
a98b1078 RK |
3978 | if ((flag_traditional || TREE_PERMANENT (decl)) |
3979 | && allocation_temporary_p ()) | |
51e29401 RS |
3980 | { |
3981 | push_obstacks_nochange (); | |
3982 | end_temporary_allocation (); | |
3983 | /* This is a no-op in c-lang.c or something real in objc-actions.c. */ | |
3984 | maybe_objc_check_decl (decl); | |
e3b776dc RK |
3985 | rest_of_decl_compilation (decl, asmspec, |
3986 | (DECL_CONTEXT (decl) == 0 | |
3987 | || TREE_ASM_WRITTEN (decl)), | |
51e29401 RS |
3988 | 0); |
3989 | pop_obstacks (); | |
3990 | } | |
3991 | else | |
3992 | { | |
3993 | /* This is a no-op in c-lang.c or something real in objc-actions.c. */ | |
3994 | maybe_objc_check_decl (decl); | |
15317f89 | 3995 | rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0, |
51e29401 RS |
3996 | 0); |
3997 | } | |
15317f89 | 3998 | if (DECL_CONTEXT (decl) != 0) |
51e29401 RS |
3999 | { |
4000 | /* Recompute the RTL of a local array now | |
4001 | if it used to be an incomplete type. */ | |
4002 | if (was_incomplete | |
1394aabd | 4003 | && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl)) |
51e29401 RS |
4004 | { |
4005 | /* If we used it already as memory, it must stay in memory. */ | |
4006 | TREE_ADDRESSABLE (decl) = TREE_USED (decl); | |
4007 | /* If it's still incomplete now, no init will save it. */ | |
4008 | if (DECL_SIZE (decl) == 0) | |
4009 | DECL_INITIAL (decl) = 0; | |
4010 | expand_decl (decl); | |
4011 | } | |
4012 | /* Compute and store the initial value. */ | |
42dfa47f RS |
4013 | if (TREE_CODE (decl) != FUNCTION_DECL) |
4014 | expand_decl_init (decl); | |
51e29401 RS |
4015 | } |
4016 | } | |
4017 | ||
4018 | if (TREE_CODE (decl) == TYPE_DECL) | |
4019 | { | |
4020 | /* This is a no-op in c-lang.c or something real in objc-actions.c. */ | |
4021 | maybe_objc_check_decl (decl); | |
15317f89 | 4022 | rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0, |
51e29401 RS |
4023 | 0); |
4024 | } | |
4025 | ||
14f3e886 | 4026 | /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */ |
3e755d23 JW |
4027 | /* This test used to include TREE_PERMANENT, however, we have the same |
4028 | problem with initializers at the function level. Such initializers get | |
4029 | saved until the end of the function on the momentary_obstack. */ | |
14f3e886 | 4030 | if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl)) |
3e755d23 | 4031 | && temporary |
eda115dd RS |
4032 | /* DECL_INITIAL is not defined in PARM_DECLs, since it shares |
4033 | space with DECL_ARG_TYPE. */ | |
4034 | && TREE_CODE (decl) != PARM_DECL) | |
51e29401 RS |
4035 | { |
4036 | /* We need to remember that this array HAD an initialization, | |
4037 | but discard the actual temporary nodes, | |
4038 | since we can't have a permanent node keep pointing to them. */ | |
14f3e886 RS |
4039 | /* We make an exception for inline functions, since it's |
4040 | normal for a local extern redeclaration of an inline function | |
4041 | to have a copy of the top-level decl's DECL_INLINE. */ | |
db57d413 | 4042 | if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node) |
549a367a | 4043 | { |
3e755d23 | 4044 | /* If this is a const variable, then preserve the |
549a367a JW |
4045 | initializer instead of discarding it so that we can optimize |
4046 | references to it. */ | |
3e755d23 JW |
4047 | /* This test used to include TREE_STATIC, but this won't be set |
4048 | for function level initializers. */ | |
3861b613 | 4049 | if (TREE_READONLY (decl) || ITERATOR_P (decl)) |
b4d4e33d RS |
4050 | { |
4051 | preserve_initializer (); | |
4052 | /* Hack? Set the permanent bit for something that is permanent, | |
ddd5a7c1 | 4053 | but not on the permanent obstack, so as to convince |
b4d4e33d RS |
4054 | output_constant_def to make its rtl on the permanent |
4055 | obstack. */ | |
4056 | TREE_PERMANENT (DECL_INITIAL (decl)) = 1; | |
7d49f92a RK |
4057 | |
4058 | /* The initializer and DECL must have the same (or equivalent | |
4059 | types), but if the initializer is a STRING_CST, its type | |
4060 | might not be on the right obstack, so copy the type | |
4061 | of DECL. */ | |
4062 | TREE_TYPE (DECL_INITIAL (decl)) = type; | |
b4d4e33d | 4063 | } |
549a367a JW |
4064 | else |
4065 | DECL_INITIAL (decl) = error_mark_node; | |
4066 | } | |
51e29401 RS |
4067 | } |
4068 | ||
739d15ab RK |
4069 | /* If requested, warn about definitions of large data objects. */ |
4070 | ||
4071 | if (warn_larger_than | |
4072 | && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL) | |
4073 | && !DECL_EXTERNAL (decl)) | |
4074 | { | |
4075 | register tree decl_size = DECL_SIZE (decl); | |
4076 | ||
4077 | if (decl_size && TREE_CODE (decl_size) == INTEGER_CST) | |
4078 | { | |
4079 | unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT; | |
4080 | ||
4081 | if (units > larger_than_size) | |
4082 | warning_with_decl (decl, "size of `%s' is %u bytes", units); | |
4083 | } | |
4084 | } | |
4085 | ||
7a0347ff | 4086 | #if 0 |
51e29401 RS |
4087 | /* Resume permanent allocation, if not within a function. */ |
4088 | /* The corresponding push_obstacks_nochange is in start_decl, | |
4089 | and in push_parm_decl and in grokfield. */ | |
4090 | pop_obstacks (); | |
7a0347ff RS |
4091 | #endif |
4092 | ||
4093 | /* If we have gone back from temporary to permanent allocation, | |
4094 | actually free the temporary space that we no longer need. */ | |
4095 | if (temporary && !allocation_temporary_p ()) | |
3e755d23 | 4096 | permanent_allocation (0); |
51e29401 RS |
4097 | |
4098 | /* At the end of a declaration, throw away any variable type sizes | |
4099 | of types defined inside that declaration. There is no use | |
4100 | computing them in the following function definition. */ | |
4101 | if (current_binding_level == global_binding_level) | |
4102 | get_pending_sizes (); | |
4103 | } | |
4104 | ||
4105 | /* If DECL has a cleanup, build and return that cleanup here. | |
4106 | This is a callback called by expand_expr. */ | |
4107 | ||
4108 | tree | |
4109 | maybe_build_cleanup (decl) | |
d6f4ec51 | 4110 | tree decl ATTRIBUTE_UNUSED; |
51e29401 RS |
4111 | { |
4112 | /* There are no cleanups in C. */ | |
4113 | return NULL_TREE; | |
4114 | } | |
4115 | ||
4116 | /* Given a parsed parameter declaration, | |
4117 | decode it into a PARM_DECL and push that on the current binding level. | |
4118 | Also, for the sake of forward parm decls, | |
4119 | record the given order of parms in `parm_order'. */ | |
4120 | ||
4121 | void | |
4122 | push_parm_decl (parm) | |
4123 | tree parm; | |
4124 | { | |
6cc902a1 | 4125 | tree decl; |
929f3671 RS |
4126 | int old_immediate_size_expand = immediate_size_expand; |
4127 | /* Don't try computing parm sizes now -- wait till fn is called. */ | |
4128 | immediate_size_expand = 0; | |
51e29401 RS |
4129 | |
4130 | /* The corresponding pop_obstacks is in finish_decl. */ | |
4131 | push_obstacks_nochange (); | |
4132 | ||
005979f2 RK |
4133 | decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)), |
4134 | TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0); | |
4135 | decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)), | |
4136 | TREE_PURPOSE (TREE_VALUE (parm))); | |
6a5ed5bf RK |
4137 | |
4138 | #if 0 | |
93e3ba4f RS |
4139 | if (DECL_NAME (decl)) |
4140 | { | |
6cc902a1 | 4141 | tree olddecl; |
93e3ba4f RS |
4142 | olddecl = lookup_name (DECL_NAME (decl)); |
4143 | if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL) | |
4144 | pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef"); | |
4145 | } | |
6a5ed5bf RK |
4146 | #endif |
4147 | ||
51e29401 RS |
4148 | decl = pushdecl (decl); |
4149 | ||
929f3671 RS |
4150 | immediate_size_expand = old_immediate_size_expand; |
4151 | ||
51e29401 RS |
4152 | current_binding_level->parm_order |
4153 | = tree_cons (NULL_TREE, decl, current_binding_level->parm_order); | |
4154 | ||
4155 | /* Add this decl to the current binding level. */ | |
4156 | finish_decl (decl, NULL_TREE, NULL_TREE); | |
4157 | } | |
4158 | ||
4159 | /* Clear the given order of parms in `parm_order'. | |
4160 | Used at start of parm list, | |
4161 | and also at semicolon terminating forward decls. */ | |
4162 | ||
4163 | void | |
4164 | clear_parm_order () | |
4165 | { | |
4166 | current_binding_level->parm_order = NULL_TREE; | |
4167 | } | |
4168 | \f | |
4169 | /* Make TYPE a complete type based on INITIAL_VALUE. | |
929f3671 | 4170 | Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered, |
51e29401 RS |
4171 | 2 if there was no information (in which case assume 1 if DO_DEFAULT). */ |
4172 | ||
4173 | int | |
4174 | complete_array_type (type, initial_value, do_default) | |
4175 | tree type; | |
4176 | tree initial_value; | |
4177 | int do_default; | |
4178 | { | |
4179 | register tree maxindex = NULL_TREE; | |
4180 | int value = 0; | |
4181 | ||
4182 | if (initial_value) | |
4183 | { | |
4184 | /* Note MAXINDEX is really the maximum index, | |
4185 | one less than the size. */ | |
4186 | if (TREE_CODE (initial_value) == STRING_CST) | |
4187 | { | |
4188 | int eltsize | |
4189 | = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value))); | |
20bf3fac RS |
4190 | maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value) |
4191 | / eltsize) - 1, 0); | |
51e29401 RS |
4192 | } |
4193 | else if (TREE_CODE (initial_value) == CONSTRUCTOR) | |
4194 | { | |
ecd4cee0 | 4195 | tree elts = CONSTRUCTOR_ELTS (initial_value); |
20bf3fac | 4196 | maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node); |
ecd4cee0 RS |
4197 | for (; elts; elts = TREE_CHAIN (elts)) |
4198 | { | |
4199 | if (TREE_PURPOSE (elts)) | |
4200 | maxindex = TREE_PURPOSE (elts); | |
4201 | else | |
4202 | maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node); | |
4203 | } | |
4204 | maxindex = copy_node (maxindex); | |
51e29401 RS |
4205 | } |
4206 | else | |
4207 | { | |
4208 | /* Make an error message unless that happened already. */ | |
4209 | if (initial_value != error_mark_node) | |
4210 | value = 1; | |
4211 | ||
4212 | /* Prevent further error messages. */ | |
b4892310 | 4213 | maxindex = build_int_2 (0, 0); |
51e29401 RS |
4214 | } |
4215 | } | |
4216 | ||
4217 | if (!maxindex) | |
4218 | { | |
4219 | if (do_default) | |
b4892310 | 4220 | maxindex = build_int_2 (0, 0); |
51e29401 RS |
4221 | value = 2; |
4222 | } | |
4223 | ||
4224 | if (maxindex) | |
4225 | { | |
4226 | TYPE_DOMAIN (type) = build_index_type (maxindex); | |
4227 | if (!TREE_TYPE (maxindex)) | |
4228 | TREE_TYPE (maxindex) = TYPE_DOMAIN (type); | |
4229 | } | |
4230 | ||
4231 | /* Lay out the type now that we can get the real answer. */ | |
4232 | ||
4233 | layout_type (type); | |
4234 | ||
4235 | return value; | |
4236 | } | |
4237 | \f | |
4238 | /* Given declspecs and a declarator, | |
4239 | determine the name and type of the object declared | |
4240 | and construct a ..._DECL node for it. | |
4241 | (In one case we can return a ..._TYPE node instead. | |
4242 | For invalid input we sometimes return 0.) | |
4243 | ||
4244 | DECLSPECS is a chain of tree_list nodes whose value fields | |
4245 | are the storage classes and type specifiers. | |
4246 | ||
4247 | DECL_CONTEXT says which syntactic context this declaration is in: | |
4248 | NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL. | |
4249 | FUNCDEF for a function definition. Like NORMAL but a few different | |
4250 | error messages in each case. Return value may be zero meaning | |
4251 | this definition is too screwy to try to parse. | |
4252 | PARM for a parameter declaration (either within a function prototype | |
4253 | or before a function body). Make a PARM_DECL, or return void_type_node. | |
4254 | TYPENAME if for a typename (in a cast or sizeof). | |
4255 | Don't make a DECL node; just return the ..._TYPE node. | |
4256 | FIELD for a struct or union field; make a FIELD_DECL. | |
4257 | BITFIELD for a field with specified width. | |
4258 | INITIALIZED is 1 if the decl has an initializer. | |
4259 | ||
4260 | In the TYPENAME case, DECLARATOR is really an absolute declarator. | |
4261 | It may also be so in the PARM case, for a prototype where the | |
4262 | argument type is specified but not the name. | |
4263 | ||
4264 | This function is where the complicated C meanings of `static' | |
929f3671 | 4265 | and `extern' are interpreted. */ |
51e29401 RS |
4266 | |
4267 | static tree | |
4268 | grokdeclarator (declarator, declspecs, decl_context, initialized) | |
4269 | tree declspecs; | |
4270 | tree declarator; | |
4271 | enum decl_context decl_context; | |
4272 | int initialized; | |
4273 | { | |
4274 | int specbits = 0; | |
4275 | tree spec; | |
4276 | tree type = NULL_TREE; | |
4277 | int longlong = 0; | |
4278 | int constp; | |
4279 | int volatilep; | |
4280 | int inlinep; | |
4281 | int explicit_int = 0; | |
4282 | int explicit_char = 0; | |
5ab10c42 | 4283 | int defaulted_int = 0; |
51e29401 RS |
4284 | tree typedef_decl = 0; |
4285 | char *name; | |
4286 | tree typedef_type = 0; | |
4287 | int funcdef_flag = 0; | |
4288 | enum tree_code innermost_code = ERROR_MARK; | |
4289 | int bitfield = 0; | |
929f3671 | 4290 | int size_varies = 0; |
4b4e3407 | 4291 | tree decl_machine_attr = NULL_TREE; |
51e29401 RS |
4292 | |
4293 | if (decl_context == BITFIELD) | |
4294 | bitfield = 1, decl_context = FIELD; | |
4295 | ||
4296 | if (decl_context == FUNCDEF) | |
4297 | funcdef_flag = 1, decl_context = NORMAL; | |
4298 | ||
4299 | push_obstacks_nochange (); | |
4300 | ||
4301 | if (flag_traditional && allocation_temporary_p ()) | |
4302 | end_temporary_allocation (); | |
4303 | ||
4304 | /* Look inside a declarator for the name being declared | |
4305 | and get it as a string, for an error message. */ | |
4306 | { | |
4307 | register tree decl = declarator; | |
4308 | name = 0; | |
4309 | ||
4310 | while (decl) | |
4311 | switch (TREE_CODE (decl)) | |
4312 | { | |
4313 | case ARRAY_REF: | |
4314 | case INDIRECT_REF: | |
4315 | case CALL_EXPR: | |
4316 | innermost_code = TREE_CODE (decl); | |
4317 | decl = TREE_OPERAND (decl, 0); | |
4318 | break; | |
4319 | ||
4320 | case IDENTIFIER_NODE: | |
4321 | name = IDENTIFIER_POINTER (decl); | |
4322 | decl = 0; | |
4323 | break; | |
4324 | ||
4325 | default: | |
4326 | abort (); | |
4327 | } | |
4328 | if (name == 0) | |
4329 | name = "type name"; | |
4330 | } | |
4331 | ||
4332 | /* A function definition's declarator must have the form of | |
4333 | a function declarator. */ | |
4334 | ||
4335 | if (funcdef_flag && innermost_code != CALL_EXPR) | |
4336 | return 0; | |
4337 | ||
4338 | /* Anything declared one level down from the top level | |
4339 | must be one of the parameters of a function | |
4340 | (because the body is at least two levels down). */ | |
4341 | ||
4342 | /* If this looks like a function definition, make it one, | |
4343 | even if it occurs where parms are expected. | |
4344 | Then store_parm_decls will reject it and not use it as a parm. */ | |
4345 | if (decl_context == NORMAL && !funcdef_flag | |
9a381dd4 | 4346 | && current_binding_level->parm_flag) |
51e29401 RS |
4347 | decl_context = PARM; |
4348 | ||
4349 | /* Look through the decl specs and record which ones appear. | |
4350 | Some typespecs are defined as built-in typenames. | |
4351 | Others, the ones that are modifiers of other types, | |
4352 | are represented by bits in SPECBITS: set the bits for | |
4353 | the modifiers that appear. Storage class keywords are also in SPECBITS. | |
4354 | ||
4355 | If there is a typedef name or a type, store the type in TYPE. | |
4356 | This includes builtin typedefs such as `int'. | |
4357 | ||
4358 | Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char' | |
4359 | and did not come from a user typedef. | |
4360 | ||
4361 | Set LONGLONG if `long' is mentioned twice. */ | |
4362 | ||
4363 | for (spec = declspecs; spec; spec = TREE_CHAIN (spec)) | |
4364 | { | |
4365 | register int i; | |
4366 | register tree id = TREE_VALUE (spec); | |
4367 | ||
4368 | if (id == ridpointers[(int) RID_INT]) | |
4369 | explicit_int = 1; | |
4370 | if (id == ridpointers[(int) RID_CHAR]) | |
4371 | explicit_char = 1; | |
4372 | ||
4373 | if (TREE_CODE (id) == IDENTIFIER_NODE) | |
4374 | for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++) | |
4375 | { | |
4376 | if (ridpointers[i] == id) | |
4377 | { | |
4378 | if (i == (int) RID_LONG && specbits & (1<<i)) | |
4379 | { | |
89d7540d | 4380 | if (longlong) |
47429a02 | 4381 | error ("`long long long' is too long for GCC"); |
51e29401 | 4382 | else |
89d7540d | 4383 | { |
5db1a3c4 | 4384 | if (pedantic && ! in_system_header) |
89d7540d RS |
4385 | pedwarn ("ANSI C does not support `long long'"); |
4386 | longlong = 1; | |
4387 | } | |
51e29401 RS |
4388 | } |
4389 | else if (specbits & (1 << i)) | |
93e3ba4f | 4390 | pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id)); |
51e29401 RS |
4391 | specbits |= 1 << i; |
4392 | goto found; | |
4393 | } | |
4394 | } | |
4395 | if (type) | |
4396 | error ("two or more data types in declaration of `%s'", name); | |
4397 | /* Actual typedefs come to us as TYPE_DECL nodes. */ | |
4398 | else if (TREE_CODE (id) == TYPE_DECL) | |
4399 | { | |
4400 | type = TREE_TYPE (id); | |
4b4e3407 | 4401 | decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id); |
51e29401 RS |
4402 | typedef_decl = id; |
4403 | } | |
4404 | /* Built-in types come as identifiers. */ | |
4405 | else if (TREE_CODE (id) == IDENTIFIER_NODE) | |
4406 | { | |
4407 | register tree t = lookup_name (id); | |
4408 | if (TREE_TYPE (t) == error_mark_node) | |
4409 | ; | |
4410 | else if (!t || TREE_CODE (t) != TYPE_DECL) | |
4411 | error ("`%s' fails to be a typedef or built in type", | |
4412 | IDENTIFIER_POINTER (id)); | |
4413 | else | |
4414 | { | |
4415 | type = TREE_TYPE (t); | |
4416 | typedef_decl = t; | |
4417 | } | |
4418 | } | |
4419 | else if (TREE_CODE (id) != ERROR_MARK) | |
4420 | type = id; | |
4421 | ||
4422 | found: {} | |
4423 | } | |
4424 | ||
4425 | typedef_type = type; | |
4426 | if (type) | |
929f3671 | 4427 | size_varies = C_TYPE_VARIABLE_SIZE (type); |
51e29401 | 4428 | |
5ab10c42 | 4429 | /* No type at all: default to `int', and set DEFAULTED_INT |
51e29401 RS |
4430 | because it was not a user-defined typedef. */ |
4431 | ||
4432 | if (type == 0) | |
4433 | { | |
f5963e61 JL |
4434 | if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT) |
4435 | | (1 << (int) RID_SIGNED) | |
4436 | | (1 << (int) RID_UNSIGNED)))) | |
4437 | && ! (in_system_header && ! allocation_temporary_p ())) | |
720283f2 RK |
4438 | { |
4439 | /* C9x will probably require a diagnostic here. | |
4440 | For now, issue a warning if -Wreturn-type and this is a function, | |
4441 | or if -Wimplicit; prefer the former warning since it is more | |
4442 | explicit. */ | |
e9a25f70 | 4443 | if ((warn_implicit_int || warn_return_type) && funcdef_flag) |
720283f2 | 4444 | warn_about_return_type = 1; |
e9a25f70 | 4445 | else if (warn_implicit_int) |
720283f2 RK |
4446 | warning ("type defaults to `int' in declaration of `%s'", name); |
4447 | } | |
4448 | ||
5ab10c42 | 4449 | defaulted_int = 1; |
51e29401 RS |
4450 | type = integer_type_node; |
4451 | } | |
4452 | ||
4453 | /* Now process the modifiers that were specified | |
4454 | and check for invalid combinations. */ | |
4455 | ||
4456 | /* Long double is a special combination. */ | |
4457 | ||
861bb6c1 | 4458 | if ((specbits & 1 << (int) RID_LONG) && ! longlong |
90d56da8 | 4459 | && TYPE_MAIN_VARIANT (type) == double_type_node) |
51e29401 RS |
4460 | { |
4461 | specbits &= ~ (1 << (int) RID_LONG); | |
4462 | type = long_double_type_node; | |
4463 | } | |
4464 | ||
4465 | /* Check all other uses of type modifiers. */ | |
4466 | ||
4467 | if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT) | |
4468 | | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED))) | |
4469 | { | |
4470 | int ok = 0; | |
4471 | ||
861bb6c1 JL |
4472 | if ((specbits & 1 << (int) RID_LONG) |
4473 | && (specbits & 1 << (int) RID_SHORT)) | |
4474 | error ("both long and short specified for `%s'", name); | |
51e29401 RS |
4475 | else if (((specbits & 1 << (int) RID_LONG) |
4476 | || (specbits & 1 << (int) RID_SHORT)) | |
4477 | && explicit_char) | |
4478 | error ("long or short specified with char for `%s'", name); | |
4479 | else if (((specbits & 1 << (int) RID_LONG) | |
4480 | || (specbits & 1 << (int) RID_SHORT)) | |
4481 | && TREE_CODE (type) == REAL_TYPE) | |
861bb6c1 JL |
4482 | { |
4483 | static int already = 0; | |
4484 | ||
4485 | error ("long or short specified with floating type for `%s'", name); | |
4486 | if (! already && ! pedantic) | |
4487 | { | |
4488 | error ("the only valid combination is `long double'"); | |
4489 | already = 1; | |
4490 | } | |
4491 | } | |
51e29401 RS |
4492 | else if ((specbits & 1 << (int) RID_SIGNED) |
4493 | && (specbits & 1 << (int) RID_UNSIGNED)) | |
861bb6c1 JL |
4494 | error ("both signed and unsigned specified for `%s'", name); |
4495 | else if (TREE_CODE (type) != INTEGER_TYPE) | |
4496 | error ("long, short, signed or unsigned invalid for `%s'", name); | |
51e29401 RS |
4497 | else |
4498 | { | |
4499 | ok = 1; | |
5ab10c42 | 4500 | if (!explicit_int && !defaulted_int && !explicit_char && pedantic) |
51e29401 RS |
4501 | { |
4502 | pedwarn ("long, short, signed or unsigned used invalidly for `%s'", | |
4503 | name); | |
4504 | if (flag_pedantic_errors) | |
4505 | ok = 0; | |
4506 | } | |
4507 | } | |
4508 | ||
4509 | /* Discard the type modifiers if they are invalid. */ | |
4510 | if (! ok) | |
4511 | { | |
4512 | specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT) | |
4513 | | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)); | |
4514 | longlong = 0; | |
4515 | } | |
4516 | } | |
4517 | ||
c470260b RK |
4518 | if ((specbits & (1 << (int) RID_COMPLEX)) |
4519 | && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE) | |
4520 | { | |
4521 | error ("complex invalid for `%s'", name); | |
4522 | specbits &= ~ (1 << (int) RID_COMPLEX); | |
4523 | } | |
4524 | ||
51e29401 RS |
4525 | /* Decide whether an integer type is signed or not. |
4526 | Optionally treat bitfields as signed by default. */ | |
4527 | if (specbits & 1 << (int) RID_UNSIGNED | |
4528 | /* Traditionally, all bitfields are unsigned. */ | |
7a0347ff RS |
4529 | || (bitfield && flag_traditional |
4530 | && (! explicit_flag_signed_bitfields || !flag_signed_bitfields)) | |
51e29401 | 4531 | || (bitfield && ! flag_signed_bitfields |
5ab10c42 | 4532 | && (explicit_int || defaulted_int || explicit_char |
51e29401 RS |
4533 | /* A typedef for plain `int' without `signed' |
4534 | can be controlled just like plain `int'. */ | |
4535 | || ! (typedef_decl != 0 | |
4536 | && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))) | |
4537 | && TREE_CODE (type) != ENUMERAL_TYPE | |
4538 | && !(specbits & 1 << (int) RID_SIGNED))) | |
4539 | { | |
4540 | if (longlong) | |
4541 | type = long_long_unsigned_type_node; | |
4542 | else if (specbits & 1 << (int) RID_LONG) | |
4543 | type = long_unsigned_type_node; | |
4544 | else if (specbits & 1 << (int) RID_SHORT) | |
4545 | type = short_unsigned_type_node; | |
4546 | else if (type == char_type_node) | |
4547 | type = unsigned_char_type_node; | |
4548 | else if (typedef_decl) | |
4549 | type = unsigned_type (type); | |
4550 | else | |
4551 | type = unsigned_type_node; | |
4552 | } | |
4553 | else if ((specbits & 1 << (int) RID_SIGNED) | |
4554 | && type == char_type_node) | |
4555 | type = signed_char_type_node; | |
4556 | else if (longlong) | |
4557 | type = long_long_integer_type_node; | |
4558 | else if (specbits & 1 << (int) RID_LONG) | |
4559 | type = long_integer_type_node; | |
4560 | else if (specbits & 1 << (int) RID_SHORT) | |
4561 | type = short_integer_type_node; | |
c470260b RK |
4562 | |
4563 | if (specbits & 1 << (int) RID_COMPLEX) | |
5ab10c42 | 4564 | { |
c470260b RK |
4565 | /* If we just have "complex", it is equivalent to |
4566 | "complex double", but if any modifiers at all are specified it is | |
4567 | the complex form of TYPE. E.g, "complex short" is | |
4568 | "complex short int". */ | |
4569 | ||
4570 | if (defaulted_int && ! longlong | |
4571 | && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT) | |
4572 | | (1 << (int) RID_SIGNED) | |
4573 | | (1 << (int) RID_UNSIGNED)))) | |
5ab10c42 RS |
4574 | type = complex_double_type_node; |
4575 | else if (type == integer_type_node) | |
4576 | type = complex_integer_type_node; | |
4577 | else if (type == float_type_node) | |
4578 | type = complex_float_type_node; | |
4579 | else if (type == double_type_node) | |
4580 | type = complex_double_type_node; | |
4581 | else if (type == long_double_type_node) | |
4582 | type = complex_long_double_type_node; | |
4583 | else | |
c470260b | 4584 | type = build_complex_type (type); |
5ab10c42 | 4585 | } |
51e29401 RS |
4586 | |
4587 | /* Set CONSTP if this declaration is `const', whether by | |
4588 | explicit specification or via a typedef. | |
4589 | Likewise for VOLATILEP. */ | |
4590 | ||
4591 | constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type); | |
4592 | volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type); | |
4593 | inlinep = !! (specbits & (1 << (int) RID_INLINE)); | |
4594 | if (constp > 1) | |
93e3ba4f | 4595 | pedwarn ("duplicate `const'"); |
51e29401 | 4596 | if (volatilep > 1) |
93e3ba4f | 4597 | pedwarn ("duplicate `volatile'"); |
51e29401 RS |
4598 | if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type))) |
4599 | type = TYPE_MAIN_VARIANT (type); | |
4600 | ||
4601 | /* Warn if two storage classes are given. Default to `auto'. */ | |
4602 | ||
4603 | { | |
4604 | int nclasses = 0; | |
4605 | ||
4606 | if (specbits & 1 << (int) RID_AUTO) nclasses++; | |
4607 | if (specbits & 1 << (int) RID_STATIC) nclasses++; | |
4608 | if (specbits & 1 << (int) RID_EXTERN) nclasses++; | |
4609 | if (specbits & 1 << (int) RID_REGISTER) nclasses++; | |
4610 | if (specbits & 1 << (int) RID_TYPEDEF) nclasses++; | |
519d591f | 4611 | if (specbits & 1 << (int) RID_ITERATOR) nclasses++; |
51e29401 RS |
4612 | |
4613 | /* Warn about storage classes that are invalid for certain | |
4614 | kinds of declarations (parameters, typenames, etc.). */ | |
4615 | ||
4616 | if (nclasses > 1) | |
4617 | error ("multiple storage classes in declaration of `%s'", name); | |
4618 | else if (funcdef_flag | |
4619 | && (specbits | |
4620 | & ((1 << (int) RID_REGISTER) | |
4621 | | (1 << (int) RID_AUTO) | |
4622 | | (1 << (int) RID_TYPEDEF)))) | |
4623 | { | |
4624 | if (specbits & 1 << (int) RID_AUTO | |
4625 | && (pedantic || current_binding_level == global_binding_level)) | |
4626 | pedwarn ("function definition declared `auto'"); | |
4627 | if (specbits & 1 << (int) RID_REGISTER) | |
4628 | error ("function definition declared `register'"); | |
4629 | if (specbits & 1 << (int) RID_TYPEDEF) | |
4630 | error ("function definition declared `typedef'"); | |
4631 | specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER) | |
4632 | | (1 << (int) RID_AUTO)); | |
4633 | } | |
4634 | else if (decl_context != NORMAL && nclasses > 0) | |
4635 | { | |
4636 | if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER) | |
4637 | ; | |
4638 | else | |
4639 | { | |
4640 | error ((decl_context == FIELD | |
4641 | ? "storage class specified for structure field `%s'" | |
4642 | : (decl_context == PARM | |
4643 | ? "storage class specified for parameter `%s'" | |
4644 | : "storage class specified for typename")), | |
4645 | name); | |
4646 | specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER) | |
4647 | | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC) | |
4648 | | (1 << (int) RID_EXTERN)); | |
4649 | } | |
4650 | } | |
4651 | else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag) | |
4652 | { | |
4653 | /* `extern' with initialization is invalid if not at top level. */ | |
4654 | if (current_binding_level == global_binding_level) | |
4655 | warning ("`%s' initialized and declared `extern'", name); | |
4656 | else | |
4657 | error ("`%s' has both `extern' and initializer", name); | |
4658 | } | |
4659 | else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag | |
4660 | && current_binding_level != global_binding_level) | |
4661 | error ("nested function `%s' declared `extern'", name); | |
4662 | else if (current_binding_level == global_binding_level | |
4663 | && specbits & (1 << (int) RID_AUTO)) | |
4664 | error ("top-level declaration of `%s' specifies `auto'", name); | |
519d591f RS |
4665 | else if ((specbits & 1 << (int) RID_ITERATOR) |
4666 | && TREE_CODE (declarator) != IDENTIFIER_NODE) | |
4667 | { | |
4668 | error ("iterator `%s' has derived type", name); | |
4669 | type = error_mark_node; | |
4670 | } | |
4671 | else if ((specbits & 1 << (int) RID_ITERATOR) | |
4672 | && TREE_CODE (type) != INTEGER_TYPE) | |
4673 | { | |
4674 | error ("iterator `%s' has noninteger type", name); | |
4675 | type = error_mark_node; | |
4676 | } | |
51e29401 RS |
4677 | } |
4678 | ||
4679 | /* Now figure out the structure of the declarator proper. | |
4680 | Descend through it, creating more complex types, until we reach | |
4681 | the declared identifier (or NULL_TREE, in an absolute declarator). */ | |
4682 | ||
4683 | while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE) | |
4684 | { | |
4685 | if (type == error_mark_node) | |
4686 | { | |
4687 | declarator = TREE_OPERAND (declarator, 0); | |
4688 | continue; | |
4689 | } | |
4690 | ||
4691 | /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]), | |
4692 | an INDIRECT_REF (for *...), | |
4693 | a CALL_EXPR (for ...(...)), | |
4694 | an identifier (for the name being declared) | |
4695 | or a null pointer (for the place in an absolute declarator | |
4696 | where the name was omitted). | |
4697 | For the last two cases, we have just exited the loop. | |
4698 | ||
4699 | At this point, TYPE is the type of elements of an array, | |
4700 | or for a function to return, or for a pointer to point to. | |
4701 | After this sequence of ifs, TYPE is the type of the | |
4702 | array or function or pointer, and DECLARATOR has had its | |
4703 | outermost layer removed. */ | |
4704 | ||
4705 | if (TREE_CODE (declarator) == ARRAY_REF) | |
4706 | { | |
4707 | register tree itype = NULL_TREE; | |
4708 | register tree size = TREE_OPERAND (declarator, 1); | |
e0e2f469 JW |
4709 | /* An uninitialized decl with `extern' is a reference. */ |
4710 | int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN)); | |
1ff1a2d2 RK |
4711 | /* The index is a signed object `sizetype' bits wide. */ |
4712 | tree index_type = signed_type (sizetype); | |
51e29401 RS |
4713 | |
4714 | declarator = TREE_OPERAND (declarator, 0); | |
4715 | ||
4716 | /* Check for some types that there cannot be arrays of. */ | |
4717 | ||
5fe86b8b | 4718 | if (TYPE_MAIN_VARIANT (type) == void_type_node) |
51e29401 RS |
4719 | { |
4720 | error ("declaration of `%s' as array of voids", name); | |
4721 | type = error_mark_node; | |
4722 | } | |
4723 | ||
4724 | if (TREE_CODE (type) == FUNCTION_TYPE) | |
4725 | { | |
4726 | error ("declaration of `%s' as array of functions", name); | |
4727 | type = error_mark_node; | |
4728 | } | |
4729 | ||
4730 | if (size == error_mark_node) | |
4731 | type = error_mark_node; | |
4732 | ||
4733 | if (type == error_mark_node) | |
4734 | continue; | |
4735 | ||
e0e2f469 JW |
4736 | /* If this is a block level extern, it must live past the end |
4737 | of the function so that we can check it against other extern | |
4738 | declarations (IDENTIFIER_LIMBO_VALUE). */ | |
4739 | if (extern_ref && allocation_temporary_p ()) | |
4740 | end_temporary_allocation (); | |
4741 | ||
51e29401 RS |
4742 | /* If size was specified, set ITYPE to a range-type for that size. |
4743 | Otherwise, ITYPE remains null. finish_decl may figure it out | |
4744 | from an initial value. */ | |
4745 | ||
4746 | if (size) | |
4747 | { | |
4748 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
874a7be1 | 4749 | STRIP_TYPE_NOPS (size); |
51e29401 RS |
4750 | |
4751 | if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE | |
4752 | && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE) | |
4753 | { | |
4754 | error ("size of array `%s' has non-integer type", name); | |
4755 | size = integer_one_node; | |
4756 | } | |
0a43d680 | 4757 | |
51e29401 RS |
4758 | if (pedantic && integer_zerop (size)) |
4759 | pedwarn ("ANSI C forbids zero-size array `%s'", name); | |
0a43d680 | 4760 | |
51e29401 RS |
4761 | if (TREE_CODE (size) == INTEGER_CST) |
4762 | { | |
90374cc2 | 4763 | constant_expression_warning (size); |
0a43d680 | 4764 | if (tree_int_cst_sgn (size) < 0) |
51e29401 RS |
4765 | { |
4766 | error ("size of array `%s' is negative", name); | |
4767 | size = integer_one_node; | |
4768 | } | |
51e29401 RS |
4769 | } |
4770 | else | |
4771 | { | |
0a43d680 RK |
4772 | /* Make sure the array size remains visibly nonconstant |
4773 | even if it is (eg) a const variable with known value. */ | |
4774 | size_varies = 1; | |
4775 | ||
51e29401 | 4776 | if (pedantic) |
1a6603da RS |
4777 | { |
4778 | if (TREE_CONSTANT (size)) | |
4779 | pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name); | |
4780 | else | |
4781 | pedwarn ("ANSI C forbids variable-size array `%s'", name); | |
4782 | } | |
51e29401 | 4783 | } |
0a43d680 | 4784 | |
1ff1a2d2 | 4785 | /* Convert size to index_type, so that if it is a variable |
0a43d680 | 4786 | the computations will be done in the proper mode. */ |
1ff1a2d2 RK |
4787 | itype = fold (build (MINUS_EXPR, index_type, |
4788 | convert (index_type, size), | |
4789 | convert (index_type, size_one_node))); | |
0a43d680 | 4790 | |
e9a25f70 JL |
4791 | /* If that overflowed, the array is too big. |
4792 | ??? While a size of INT_MAX+1 technically shouldn't cause | |
4793 | an overflow (because we subtract 1), the overflow is recorded | |
4794 | during the conversion to index_type, before the subtraction. | |
4795 | Handling this case seems like an unnecessary complication. */ | |
4796 | if (TREE_OVERFLOW (itype)) | |
4797 | { | |
4798 | error ("size of array `%s' is too large", name); | |
4799 | type = error_mark_node; | |
4800 | continue; | |
4801 | } | |
4802 | ||
0a43d680 RK |
4803 | if (size_varies) |
4804 | itype = variable_size (itype); | |
4805 | itype = build_index_type (itype); | |
51e29401 RS |
4806 | } |
4807 | ||
4808 | #if 0 /* This had bad results for pointers to arrays, as in | |
4809 | union incomplete (*foo)[4]; */ | |
4810 | /* Complain about arrays of incomplete types, except in typedefs. */ | |
4811 | ||
4812 | if (TYPE_SIZE (type) == 0 | |
4813 | /* Avoid multiple warnings for nested array types. */ | |
4814 | && TREE_CODE (type) != ARRAY_TYPE | |
4815 | && !(specbits & (1 << (int) RID_TYPEDEF)) | |
4816 | && !C_TYPE_BEING_DEFINED (type)) | |
4817 | warning ("array type has incomplete element type"); | |
4818 | #endif | |
4819 | ||
51e29401 RS |
4820 | #if 0 /* We shouldn't have a function type here at all! |
4821 | Functions aren't allowed as array elements. */ | |
4822 | if (pedantic && TREE_CODE (type) == FUNCTION_TYPE | |
4823 | && (constp || volatilep)) | |
4824 | pedwarn ("ANSI C forbids const or volatile function types"); | |
4825 | #endif | |
50e65854 JW |
4826 | |
4827 | /* Build the array type itself, then merge any constancy or | |
4828 | volatility into the target type. We must do it in this order | |
4829 | to ensure that the TYPE_MAIN_VARIANT field of the array type | |
4830 | is set correctly. */ | |
4831 | ||
4832 | type = build_array_type (type, itype); | |
51e29401 RS |
4833 | if (constp || volatilep) |
4834 | type = c_build_type_variant (type, constp, volatilep); | |
4835 | ||
4836 | #if 0 /* don't clear these; leave them set so that the array type | |
4837 | or the variable is itself const or volatile. */ | |
4838 | constp = 0; | |
4839 | volatilep = 0; | |
4840 | #endif | |
4841 | ||
929f3671 | 4842 | if (size_varies) |
51e29401 RS |
4843 | C_TYPE_VARIABLE_SIZE (type) = 1; |
4844 | } | |
4845 | else if (TREE_CODE (declarator) == CALL_EXPR) | |
4846 | { | |
fd0b8fce JW |
4847 | int extern_ref = (!(specbits & (1 << (int) RID_AUTO)) |
4848 | || current_binding_level == global_binding_level); | |
51e29401 RS |
4849 | tree arg_types; |
4850 | ||
4851 | /* Declaring a function type. | |
4852 | Make sure we have a valid type for the function to return. */ | |
4853 | if (type == error_mark_node) | |
4854 | continue; | |
4855 | ||
929f3671 | 4856 | size_varies = 0; |
51e29401 RS |
4857 | |
4858 | /* Warn about some types functions can't return. */ | |
4859 | ||
4860 | if (TREE_CODE (type) == FUNCTION_TYPE) | |
4861 | { | |
4862 | error ("`%s' declared as function returning a function", name); | |
4863 | type = integer_type_node; | |
4864 | } | |
4865 | if (TREE_CODE (type) == ARRAY_TYPE) | |
4866 | { | |
4867 | error ("`%s' declared as function returning an array", name); | |
4868 | type = integer_type_node; | |
4869 | } | |
4870 | ||
4871 | #ifndef TRADITIONAL_RETURN_FLOAT | |
4872 | /* Traditionally, declaring return type float means double. */ | |
4873 | ||
90d56da8 | 4874 | if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node) |
51e29401 RS |
4875 | type = double_type_node; |
4876 | #endif /* TRADITIONAL_RETURN_FLOAT */ | |
4877 | ||
fd0b8fce JW |
4878 | /* If this is a block level extern, it must live past the end |
4879 | of the function so that we can check it against other extern | |
4880 | declarations (IDENTIFIER_LIMBO_VALUE). */ | |
4881 | if (extern_ref && allocation_temporary_p ()) | |
4882 | end_temporary_allocation (); | |
4883 | ||
51e29401 RS |
4884 | /* Construct the function type and go to the next |
4885 | inner layer of declarator. */ | |
4886 | ||
4887 | arg_types = grokparms (TREE_OPERAND (declarator, 1), | |
4888 | funcdef_flag | |
4889 | /* Say it's a definition | |
4890 | only for the CALL_EXPR | |
4891 | closest to the identifier. */ | |
4892 | && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE); | |
4893 | #if 0 /* This seems to be false. We turn off temporary allocation | |
4894 | above in this function if -traditional. | |
4895 | And this code caused inconsistent results with prototypes: | |
4896 | callers would ignore them, and pass arguments wrong. */ | |
4897 | ||
4898 | /* Omit the arg types if -traditional, since the arg types | |
4899 | and the list links might not be permanent. */ | |
8d9bfdc5 RK |
4900 | type = build_function_type (type, |
4901 | flag_traditional | |
4902 | ? NULL_TREE : arg_types); | |
51e29401 | 4903 | #endif |
61df2ee2 RS |
4904 | /* ANSI seems to say that `const int foo ();' |
4905 | does not make the function foo const. */ | |
4906 | if (constp || volatilep) | |
4907 | type = c_build_type_variant (type, constp, volatilep); | |
4908 | constp = 0; | |
4909 | volatilep = 0; | |
4910 | ||
51e29401 RS |
4911 | type = build_function_type (type, arg_types); |
4912 | declarator = TREE_OPERAND (declarator, 0); | |
4913 | ||
4914 | /* Set the TYPE_CONTEXTs for each tagged type which is local to | |
4915 | the formal parameter list of this FUNCTION_TYPE to point to | |
4916 | the FUNCTION_TYPE node itself. */ | |
4917 | ||
4918 | { | |
4919 | register tree link; | |
4920 | ||
2a851b5c | 4921 | for (link = last_function_parm_tags; |
51e29401 RS |
4922 | link; |
4923 | link = TREE_CHAIN (link)) | |
4924 | TYPE_CONTEXT (TREE_VALUE (link)) = type; | |
4925 | } | |
4926 | } | |
4927 | else if (TREE_CODE (declarator) == INDIRECT_REF) | |
4928 | { | |
4929 | /* Merge any constancy or volatility into the target type | |
4930 | for the pointer. */ | |
4931 | ||
4932 | if (pedantic && TREE_CODE (type) == FUNCTION_TYPE | |
4933 | && (constp || volatilep)) | |
4934 | pedwarn ("ANSI C forbids const or volatile function types"); | |
4935 | if (constp || volatilep) | |
4936 | type = c_build_type_variant (type, constp, volatilep); | |
4937 | constp = 0; | |
4938 | volatilep = 0; | |
929f3671 | 4939 | size_varies = 0; |
51e29401 RS |
4940 | |
4941 | type = build_pointer_type (type); | |
4942 | ||
4943 | /* Process a list of type modifier keywords | |
4944 | (such as const or volatile) that were given inside the `*'. */ | |
4945 | ||
4946 | if (TREE_TYPE (declarator)) | |
4947 | { | |
4948 | register tree typemodlist; | |
4949 | int erred = 0; | |
4950 | for (typemodlist = TREE_TYPE (declarator); typemodlist; | |
4951 | typemodlist = TREE_CHAIN (typemodlist)) | |
4952 | { | |
4953 | if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST]) | |
4954 | constp++; | |
4955 | else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE]) | |
4956 | volatilep++; | |
4957 | else if (!erred) | |
4958 | { | |
4959 | erred = 1; | |
4960 | error ("invalid type modifier within pointer declarator"); | |
4961 | } | |
4962 | } | |
4963 | if (constp > 1) | |
47429a02 | 4964 | pedwarn ("duplicate `const'"); |
51e29401 | 4965 | if (volatilep > 1) |
47429a02 | 4966 | pedwarn ("duplicate `volatile'"); |
51e29401 RS |
4967 | } |
4968 | ||
4969 | declarator = TREE_OPERAND (declarator, 0); | |
4970 | } | |
4971 | else | |
4972 | abort (); | |
4973 | ||
4974 | } | |
4975 | ||
4976 | /* Now TYPE has the actual type. */ | |
4977 | ||
e9a25f70 JL |
4978 | /* Did array size calculations overflow? */ |
4979 | ||
4980 | if (TREE_CODE (type) == ARRAY_TYPE | |
4981 | && TYPE_SIZE (type) | |
4982 | && TREE_OVERFLOW (TYPE_SIZE (type))) | |
4983 | error ("size of array `%s' is too large", name); | |
4984 | ||
51e29401 RS |
4985 | /* If this is declaring a typedef name, return a TYPE_DECL. */ |
4986 | ||
4987 | if (specbits & (1 << (int) RID_TYPEDEF)) | |
4988 | { | |
4989 | tree decl; | |
4990 | /* Note that the grammar rejects storage classes | |
4991 | in typenames, fields or parameters */ | |
4992 | if (pedantic && TREE_CODE (type) == FUNCTION_TYPE | |
4993 | && (constp || volatilep)) | |
4994 | pedwarn ("ANSI C forbids const or volatile function types"); | |
4995 | if (constp || volatilep) | |
4996 | type = c_build_type_variant (type, constp, volatilep); | |
51e29401 RS |
4997 | decl = build_decl (TYPE_DECL, declarator, type); |
4998 | if ((specbits & (1 << (int) RID_SIGNED)) | |
4999 | || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))) | |
5000 | C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1; | |
e6f379d0 | 5001 | pop_obstacks (); |
51e29401 RS |
5002 | return decl; |
5003 | } | |
5004 | ||
5005 | /* Detect the case of an array type of unspecified size | |
5006 | which came, as such, direct from a typedef name. | |
5007 | We must copy the type, so that each identifier gets | |
5008 | a distinct type, so that each identifier's size can be | |
5009 | controlled separately by its own initializer. */ | |
5010 | ||
5011 | if (type != 0 && typedef_type != 0 | |
5012 | && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type) | |
5013 | && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0) | |
5014 | { | |
5015 | type = build_array_type (TREE_TYPE (type), 0); | |
929f3671 | 5016 | if (size_varies) |
51e29401 RS |
5017 | C_TYPE_VARIABLE_SIZE (type) = 1; |
5018 | } | |
5019 | ||
5020 | /* If this is a type name (such as, in a cast or sizeof), | |
5021 | compute the type and return it now. */ | |
5022 | ||
5023 | if (decl_context == TYPENAME) | |
5024 | { | |
5025 | /* Note that the grammar rejects storage classes | |
5026 | in typenames, fields or parameters */ | |
5027 | if (pedantic && TREE_CODE (type) == FUNCTION_TYPE | |
5028 | && (constp || volatilep)) | |
5029 | pedwarn ("ANSI C forbids const or volatile function types"); | |
5030 | if (constp || volatilep) | |
5031 | type = c_build_type_variant (type, constp, volatilep); | |
5032 | pop_obstacks (); | |
5033 | return type; | |
5034 | } | |
5035 | ||
61df2ee2 RS |
5036 | /* Aside from typedefs and type names (handle above), |
5037 | `void' at top level (not within pointer) | |
5038 | is allowed only in public variables. | |
51e29401 RS |
5039 | We don't complain about parms either, but that is because |
5040 | a better error message can be made later. */ | |
5041 | ||
61df2ee2 RS |
5042 | if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM |
5043 | && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE) | |
5044 | && ((specbits & (1 << (int) RID_EXTERN)) | |
5045 | || (current_binding_level == global_binding_level | |
5046 | && !(specbits | |
5047 | & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER))))))) | |
51e29401 | 5048 | { |
c40f7b33 | 5049 | error ("variable or field `%s' declared void", name); |
51e29401 RS |
5050 | type = integer_type_node; |
5051 | } | |
5052 | ||
5053 | /* Now create the decl, which may be a VAR_DECL, a PARM_DECL | |
5054 | or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */ | |
5055 | ||
5056 | { | |
5057 | register tree decl; | |
5058 | ||
5059 | if (decl_context == PARM) | |
5060 | { | |
5061 | tree type_as_written = type; | |
90d56da8 | 5062 | tree main_type; |
51e29401 RS |
5063 | |
5064 | /* A parameter declared as an array of T is really a pointer to T. | |
5065 | One declared as a function is really a pointer to a function. */ | |
5066 | ||
5067 | if (TREE_CODE (type) == ARRAY_TYPE) | |
5068 | { | |
5069 | /* Transfer const-ness of array into that of type pointed to. */ | |
eaf2e788 RS |
5070 | type = TREE_TYPE (type); |
5071 | if (constp || volatilep) | |
5072 | type = c_build_type_variant (type, constp, volatilep); | |
5073 | type = build_pointer_type (type); | |
51e29401 | 5074 | volatilep = constp = 0; |
929f3671 | 5075 | size_varies = 0; |
51e29401 RS |
5076 | } |
5077 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
5078 | { | |
5079 | if (pedantic && (constp || volatilep)) | |
5080 | pedwarn ("ANSI C forbids const or volatile function types"); | |
eaf2e788 RS |
5081 | if (constp || volatilep) |
5082 | type = c_build_type_variant (type, constp, volatilep); | |
5083 | type = build_pointer_type (type); | |
51e29401 RS |
5084 | volatilep = constp = 0; |
5085 | } | |
5086 | ||
51e29401 | 5087 | decl = build_decl (PARM_DECL, declarator, type); |
929f3671 | 5088 | if (size_varies) |
51e29401 RS |
5089 | C_DECL_VARIABLE_SIZE (decl) = 1; |
5090 | ||
5091 | /* Compute the type actually passed in the parmlist, | |
5092 | for the case where there is no prototype. | |
5093 | (For example, shorts and chars are passed as ints.) | |
5094 | When there is a prototype, this is overridden later. */ | |
5095 | ||
5096 | DECL_ARG_TYPE (decl) = type; | |
f537a5c5 RS |
5097 | main_type = (type == error_mark_node |
5098 | ? error_mark_node | |
5099 | : TYPE_MAIN_VARIANT (type)); | |
90d56da8 | 5100 | if (main_type == float_type_node) |
51e29401 | 5101 | DECL_ARG_TYPE (decl) = double_type_node; |
13d39dbc | 5102 | /* Don't use TYPE_PRECISION to decide whether to promote, |
8eebb258 RS |
5103 | because we should convert short if it's the same size as int, |
5104 | but we should not convert long if it's the same size as int. */ | |
f537a5c5 RS |
5105 | else if (TREE_CODE (main_type) != ERROR_MARK |
5106 | && C_PROMOTING_INTEGER_TYPE_P (main_type)) | |
8eebb258 RS |
5107 | { |
5108 | if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node) | |
5109 | && TREE_UNSIGNED (type)) | |
5110 | DECL_ARG_TYPE (decl) = unsigned_type_node; | |
5111 | else | |
5112 | DECL_ARG_TYPE (decl) = integer_type_node; | |
5113 | } | |
51e29401 RS |
5114 | |
5115 | DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written; | |
5116 | } | |
5117 | else if (decl_context == FIELD) | |
5118 | { | |
5119 | /* Structure field. It may not be a function. */ | |
5120 | ||
5121 | if (TREE_CODE (type) == FUNCTION_TYPE) | |
5122 | { | |
c40f7b33 | 5123 | error ("field `%s' declared as a function", name); |
51e29401 RS |
5124 | type = build_pointer_type (type); |
5125 | } | |
5126 | else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0) | |
5127 | { | |
c40f7b33 | 5128 | error ("field `%s' has incomplete type", name); |
51e29401 RS |
5129 | type = error_mark_node; |
5130 | } | |
5131 | /* Move type qualifiers down to element of an array. */ | |
5132 | if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep)) | |
5133 | { | |
5134 | type = build_array_type (c_build_type_variant (TREE_TYPE (type), | |
5135 | constp, volatilep), | |
5136 | TYPE_DOMAIN (type)); | |
5137 | #if 0 /* Leave the field const or volatile as well. */ | |
5138 | constp = volatilep = 0; | |
5139 | #endif | |
5140 | } | |
5141 | decl = build_decl (FIELD_DECL, declarator, type); | |
929f3671 | 5142 | if (size_varies) |
51e29401 RS |
5143 | C_DECL_VARIABLE_SIZE (decl) = 1; |
5144 | } | |
5145 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
5146 | { | |
fd0b8fce JW |
5147 | /* Every function declaration is "external" |
5148 | except for those which are inside a function body | |
5149 | in which `auto' is used. | |
5150 | That is a case not specified by ANSI C, | |
5151 | and we use it for forward declarations for nested functions. */ | |
5152 | int extern_ref = (!(specbits & (1 << (int) RID_AUTO)) | |
5153 | || current_binding_level == global_binding_level); | |
5154 | ||
51e29401 RS |
5155 | if (specbits & (1 << (int) RID_AUTO) |
5156 | && (pedantic || current_binding_level == global_binding_level)) | |
c40f7b33 | 5157 | pedwarn ("invalid storage class for function `%s'", name); |
51e29401 | 5158 | if (specbits & (1 << (int) RID_REGISTER)) |
c40f7b33 | 5159 | error ("invalid storage class for function `%s'", name); |
51e29401 RS |
5160 | /* Function declaration not at top level. |
5161 | Storage classes other than `extern' are not allowed | |
5162 | and `extern' makes no difference. */ | |
5163 | if (current_binding_level != global_binding_level | |
5164 | && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE))) | |
5165 | && pedantic) | |
c40f7b33 | 5166 | pedwarn ("invalid storage class for function `%s'", name); |
fd0b8fce JW |
5167 | |
5168 | /* If this is a block level extern, it must live past the end | |
5169 | of the function so that we can check it against other | |
5170 | extern declarations (IDENTIFIER_LIMBO_VALUE). */ | |
5171 | if (extern_ref && allocation_temporary_p ()) | |
5172 | end_temporary_allocation (); | |
5173 | ||
51e29401 | 5174 | decl = build_decl (FUNCTION_DECL, declarator, type); |
4b4e3407 | 5175 | decl = build_decl_attribute_variant (decl, decl_machine_attr); |
51e29401 | 5176 | |
7a0347ff RS |
5177 | if (pedantic && (constp || volatilep) |
5178 | && ! DECL_IN_SYSTEM_HEADER (decl)) | |
51e29401 RS |
5179 | pedwarn ("ANSI C forbids const or volatile functions"); |
5180 | ||
ae998c9a DE |
5181 | if (pedantic |
5182 | && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node | |
5183 | && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (decl))) | |
5184 | || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (decl)))) | |
5185 | && ! DECL_IN_SYSTEM_HEADER (decl)) | |
5186 | pedwarn ("ANSI C forbids const or volatile void function return type"); | |
5187 | ||
61df2ee2 RS |
5188 | if (volatilep |
5189 | && TREE_TYPE (TREE_TYPE (decl)) != void_type_node) | |
11433f42 | 5190 | warning ("`noreturn' function returns non-void value"); |
61df2ee2 | 5191 | |
fd0b8fce | 5192 | if (extern_ref) |
1394aabd | 5193 | DECL_EXTERNAL (decl) = 1; |
51e29401 RS |
5194 | /* Record absence of global scope for `static' or `auto'. */ |
5195 | TREE_PUBLIC (decl) | |
5196 | = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO))); | |
c40f7b33 | 5197 | |
51e29401 RS |
5198 | /* Record presence of `inline', if it is reasonable. */ |
5199 | if (inlinep) | |
5200 | { | |
5201 | tree last = tree_last (TYPE_ARG_TYPES (type)); | |
5202 | ||
5203 | if (! strcmp (IDENTIFIER_POINTER (declarator), "main")) | |
5204 | warning ("cannot inline function `main'"); | |
51e29401 RS |
5205 | else |
5206 | /* Assume that otherwise the function can be inlined. */ | |
1394aabd | 5207 | DECL_INLINE (decl) = 1; |
51e29401 RS |
5208 | |
5209 | if (specbits & (1 << (int) RID_EXTERN)) | |
5210 | current_extern_inline = 1; | |
5211 | } | |
5212 | } | |
5213 | else | |
5214 | { | |
5215 | /* It's a variable. */ | |
fd0b8fce JW |
5216 | /* An uninitialized decl with `extern' is a reference. */ |
5217 | int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN)); | |
51e29401 RS |
5218 | |
5219 | /* Move type qualifiers down to element of an array. */ | |
5220 | if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep)) | |
5221 | { | |
5222 | type = build_array_type (c_build_type_variant (TREE_TYPE (type), | |
5223 | constp, volatilep), | |
5224 | TYPE_DOMAIN (type)); | |
5225 | #if 0 /* Leave the variable const or volatile as well. */ | |
5226 | constp = volatilep = 0; | |
5227 | #endif | |
5228 | } | |
5229 | ||
fd0b8fce JW |
5230 | /* If this is a block level extern, it must live past the end |
5231 | of the function so that we can check it against other | |
5232 | extern declarations (IDENTIFIER_LIMBO_VALUE). */ | |
5233 | if (extern_ref && allocation_temporary_p ()) | |
5234 | end_temporary_allocation (); | |
5235 | ||
51e29401 | 5236 | decl = build_decl (VAR_DECL, declarator, type); |
929f3671 | 5237 | if (size_varies) |
51e29401 RS |
5238 | C_DECL_VARIABLE_SIZE (decl) = 1; |
5239 | ||
5240 | if (inlinep) | |
5241 | pedwarn_with_decl (decl, "variable `%s' declared `inline'"); | |
5242 | ||
fd0b8fce | 5243 | DECL_EXTERNAL (decl) = extern_ref; |
ee534ebf RS |
5244 | /* At top level, the presence of a `static' or `register' storage |
5245 | class specifier, or the absence of all storage class specifiers | |
5246 | makes this declaration a definition (perhaps tentative). Also, | |
5247 | the absence of both `static' and `register' makes it public. */ | |
51e29401 RS |
5248 | if (current_binding_level == global_binding_level) |
5249 | { | |
ee534ebf RS |
5250 | TREE_PUBLIC (decl) |
5251 | = !(specbits | |
5252 | & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER))); | |
1394aabd | 5253 | TREE_STATIC (decl) = ! DECL_EXTERNAL (decl); |
51e29401 RS |
5254 | } |
5255 | /* Not at top level, only `static' makes a static definition. */ | |
5256 | else | |
5257 | { | |
5258 | TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0; | |
1394aabd | 5259 | TREE_PUBLIC (decl) = DECL_EXTERNAL (decl); |
51e29401 | 5260 | } |
519d591f RS |
5261 | |
5262 | if (specbits & 1 << (int) RID_ITERATOR) | |
5263 | ITERATOR_P (decl) = 1; | |
51e29401 RS |
5264 | } |
5265 | ||
5266 | /* Record `register' declaration for warnings on & | |
5267 | and in case doing stupid register allocation. */ | |
5268 | ||
5269 | if (specbits & (1 << (int) RID_REGISTER)) | |
1394aabd | 5270 | DECL_REGISTER (decl) = 1; |
51e29401 RS |
5271 | |
5272 | /* Record constancy and volatility. */ | |
5273 | ||
5274 | if (constp) | |
5275 | TREE_READONLY (decl) = 1; | |
5276 | if (volatilep) | |
5277 | { | |
5278 | TREE_SIDE_EFFECTS (decl) = 1; | |
5279 | TREE_THIS_VOLATILE (decl) = 1; | |
5280 | } | |
5281 | /* If a type has volatile components, it should be stored in memory. | |
5282 | Otherwise, the fact that those components are volatile | |
5283 | will be ignored, and would even crash the compiler. */ | |
5284 | if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))) | |
5285 | mark_addressable (decl); | |
5286 | ||
5287 | pop_obstacks (); | |
5288 | ||
5289 | return decl; | |
5290 | } | |
5291 | } | |
5292 | \f | |
51e29401 RS |
5293 | /* Decode the parameter-list info for a function type or function definition. |
5294 | The argument is the value returned by `get_parm_info' (or made in parse.y | |
5295 | if there is an identifier list instead of a parameter decl list). | |
5296 | These two functions are separate because when a function returns | |
5297 | or receives functions then each is called multiple times but the order | |
5298 | of calls is different. The last call to `grokparms' is always the one | |
5299 | that contains the formal parameter names of a function definition. | |
5300 | ||
5301 | Store in `last_function_parms' a chain of the decls of parms. | |
5302 | Also store in `last_function_parm_tags' a chain of the struct, union, | |
5303 | and enum tags declared among the parms. | |
5304 | ||
5305 | Return a list of arg types to use in the FUNCTION_TYPE for this function. | |
5306 | ||
5307 | FUNCDEF_FLAG is nonzero for a function definition, 0 for | |
5308 | a mere declaration. A nonempty identifier-list gets an error message | |
5309 | when FUNCDEF_FLAG is zero. */ | |
5310 | ||
5311 | static tree | |
5312 | grokparms (parms_info, funcdef_flag) | |
5313 | tree parms_info; | |
5314 | int funcdef_flag; | |
5315 | { | |
5316 | tree first_parm = TREE_CHAIN (parms_info); | |
5317 | ||
5318 | last_function_parms = TREE_PURPOSE (parms_info); | |
5319 | last_function_parm_tags = TREE_VALUE (parms_info); | |
5320 | ||
27f427f8 RS |
5321 | if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag |
5322 | && !in_system_header) | |
51e29401 RS |
5323 | warning ("function declaration isn't a prototype"); |
5324 | ||
5325 | if (first_parm != 0 | |
5326 | && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE) | |
5327 | { | |
5328 | if (! funcdef_flag) | |
5329 | pedwarn ("parameter names (without types) in function declaration"); | |
5330 | ||
5331 | last_function_parms = first_parm; | |
5332 | return 0; | |
5333 | } | |
5334 | else | |
5335 | { | |
5336 | tree parm; | |
5337 | tree typelt; | |
5338 | /* We no longer test FUNCDEF_FLAG. | |
5339 | If the arg types are incomplete in a declaration, | |
5340 | they must include undefined tags. | |
5341 | These tags can never be defined in the scope of the declaration, | |
5342 | so the types can never be completed, | |
5343 | and no call can be compiled successfully. */ | |
5344 | #if 0 | |
5345 | /* In a fcn definition, arg types must be complete. */ | |
5346 | if (funcdef_flag) | |
5347 | #endif | |
5348 | for (parm = last_function_parms, typelt = first_parm; | |
5349 | parm; | |
5350 | parm = TREE_CHAIN (parm)) | |
5351 | /* Skip over any enumeration constants declared here. */ | |
5352 | if (TREE_CODE (parm) == PARM_DECL) | |
5353 | { | |
5354 | /* Barf if the parameter itself has an incomplete type. */ | |
5355 | tree type = TREE_VALUE (typelt); | |
5356 | if (TYPE_SIZE (type) == 0) | |
5357 | { | |
5358 | if (funcdef_flag && DECL_NAME (parm) != 0) | |
5359 | error ("parameter `%s' has incomplete type", | |
5360 | IDENTIFIER_POINTER (DECL_NAME (parm))); | |
5361 | else | |
5362 | warning ("parameter has incomplete type"); | |
5363 | if (funcdef_flag) | |
5364 | { | |
5365 | TREE_VALUE (typelt) = error_mark_node; | |
5366 | TREE_TYPE (parm) = error_mark_node; | |
5367 | } | |
5368 | } | |
5369 | #if 0 /* This has been replaced by parm_tags_warning | |
5370 | which uses a more accurate criterion for what to warn about. */ | |
5371 | else | |
5372 | { | |
5373 | /* Now warn if is a pointer to an incomplete type. */ | |
5374 | while (TREE_CODE (type) == POINTER_TYPE | |
5375 | || TREE_CODE (type) == REFERENCE_TYPE) | |
5376 | type = TREE_TYPE (type); | |
5377 | type = TYPE_MAIN_VARIANT (type); | |
5378 | if (TYPE_SIZE (type) == 0) | |
5379 | { | |
5380 | if (DECL_NAME (parm) != 0) | |
5381 | warning ("parameter `%s' points to incomplete type", | |
5382 | IDENTIFIER_POINTER (DECL_NAME (parm))); | |
5383 | else | |
5384 | warning ("parameter points to incomplete type"); | |
5385 | } | |
5386 | } | |
5387 | #endif | |
5388 | typelt = TREE_CHAIN (typelt); | |
5389 | } | |
5390 | ||
023de292 | 5391 | /* Allocate the list of types the way we allocate a type. */ |
c47851dd | 5392 | if (first_parm && ! TREE_PERMANENT (first_parm)) |
023de292 RS |
5393 | { |
5394 | /* Construct a copy of the list of types | |
5395 | on the saveable obstack. */ | |
5396 | tree result = NULL; | |
5397 | for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt)) | |
5398 | result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt), | |
5399 | result); | |
5400 | return nreverse (result); | |
5401 | } | |
5402 | else | |
5403 | /* The list we have is permanent already. */ | |
5404 | return first_parm; | |
51e29401 RS |
5405 | } |
5406 | } | |
5407 | ||
5408 | ||
5409 | /* Return a tree_list node with info on a parameter list just parsed. | |
5410 | The TREE_PURPOSE is a chain of decls of those parms. | |
5411 | The TREE_VALUE is a list of structure, union and enum tags defined. | |
5412 | The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE. | |
5413 | This tree_list node is later fed to `grokparms'. | |
5414 | ||
5415 | VOID_AT_END nonzero means append `void' to the end of the type-list. | |
5416 | Zero means the parmlist ended with an ellipsis so don't append `void'. */ | |
5417 | ||
5418 | tree | |
5419 | get_parm_info (void_at_end) | |
5420 | int void_at_end; | |
5421 | { | |
5422 | register tree decl, t; | |
5423 | register tree types = 0; | |
5424 | int erred = 0; | |
5425 | tree tags = gettags (); | |
5426 | tree parms = getdecls (); | |
5427 | tree new_parms = 0; | |
5428 | tree order = current_binding_level->parm_order; | |
5429 | ||
5430 | /* Just `void' (and no ellipsis) is special. There are really no parms. */ | |
5431 | if (void_at_end && parms != 0 | |
5432 | && TREE_CHAIN (parms) == 0 | |
5fe86b8b | 5433 | && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node |
51e29401 RS |
5434 | && DECL_NAME (parms) == 0) |
5435 | { | |
5436 | parms = NULL_TREE; | |
5437 | storedecls (NULL_TREE); | |
5438 | return saveable_tree_cons (NULL_TREE, NULL_TREE, | |
5439 | saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE)); | |
5440 | } | |
5441 | ||
fc3ffe83 RK |
5442 | /* Extract enumerator values and other non-parms declared with the parms. |
5443 | Likewise any forward parm decls that didn't have real parm decls. */ | |
51e29401 RS |
5444 | for (decl = parms; decl; ) |
5445 | { | |
5446 | tree next = TREE_CHAIN (decl); | |
5447 | ||
e38e5ba8 | 5448 | if (TREE_CODE (decl) != PARM_DECL) |
fc3ffe83 | 5449 | { |
fc3ffe83 RK |
5450 | TREE_CHAIN (decl) = new_parms; |
5451 | new_parms = decl; | |
5452 | } | |
e38e5ba8 | 5453 | else if (TREE_ASM_WRITTEN (decl)) |
51e29401 | 5454 | { |
e38e5ba8 | 5455 | error_with_decl (decl, "parameter `%s' has just a forward declaration"); |
51e29401 RS |
5456 | TREE_CHAIN (decl) = new_parms; |
5457 | new_parms = decl; | |
5458 | } | |
5459 | decl = next; | |
5460 | } | |
5461 | ||
5462 | /* Put the parm decls back in the order they were in in the parm list. */ | |
5463 | for (t = order; t; t = TREE_CHAIN (t)) | |
5464 | { | |
5465 | if (TREE_CHAIN (t)) | |
5466 | TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t)); | |
5467 | else | |
5468 | TREE_CHAIN (TREE_VALUE (t)) = 0; | |
5469 | } | |
5470 | ||
5471 | new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0, | |
5472 | new_parms); | |
5473 | ||
5474 | /* Store the parmlist in the binding level since the old one | |
5475 | is no longer a valid list. (We have changed the chain pointers.) */ | |
5476 | storedecls (new_parms); | |
5477 | ||
5478 | for (decl = new_parms; decl; decl = TREE_CHAIN (decl)) | |
5479 | /* There may also be declarations for enumerators if an enumeration | |
5480 | type is declared among the parms. Ignore them here. */ | |
5481 | if (TREE_CODE (decl) == PARM_DECL) | |
5482 | { | |
5483 | /* Since there is a prototype, | |
5484 | args are passed in their declared types. */ | |
5485 | tree type = TREE_TYPE (decl); | |
5486 | DECL_ARG_TYPE (decl) = type; | |
5487 | #ifdef PROMOTE_PROTOTYPES | |
fd48df3e RK |
5488 | if ((TREE_CODE (type) == INTEGER_TYPE |
5489 | || TREE_CODE (type) == ENUMERAL_TYPE) | |
51e29401 RS |
5490 | && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) |
5491 | DECL_ARG_TYPE (decl) = integer_type_node; | |
5492 | #endif | |
5493 | ||
5494 | types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types); | |
5fe86b8b | 5495 | if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred |
51e29401 RS |
5496 | && DECL_NAME (decl) == 0) |
5497 | { | |
5498 | error ("`void' in parameter list must be the entire list"); | |
5499 | erred = 1; | |
5500 | } | |
5501 | } | |
5502 | ||
5503 | if (void_at_end) | |
5504 | return saveable_tree_cons (new_parms, tags, | |
5505 | nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types))); | |
5506 | ||
5507 | return saveable_tree_cons (new_parms, tags, nreverse (types)); | |
5508 | } | |
5509 | ||
5510 | /* At end of parameter list, warn about any struct, union or enum tags | |
5511 | defined within. Do so because these types cannot ever become complete. */ | |
5512 | ||
5513 | void | |
5514 | parmlist_tags_warning () | |
5515 | { | |
5516 | tree elt; | |
5517 | static int already; | |
5518 | ||
5519 | for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt)) | |
5520 | { | |
5521 | enum tree_code code = TREE_CODE (TREE_VALUE (elt)); | |
27301b30 RS |
5522 | /* An anonymous union parm type is meaningful as a GNU extension. |
5523 | So don't warn for that. */ | |
293facbc | 5524 | if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic) |
27301b30 | 5525 | continue; |
c138f328 RS |
5526 | if (TREE_PURPOSE (elt) != 0) |
5527 | warning ("`%s %s' declared inside parameter list", | |
5528 | (code == RECORD_TYPE ? "struct" | |
5529 | : code == UNION_TYPE ? "union" | |
5530 | : "enum"), | |
5531 | IDENTIFIER_POINTER (TREE_PURPOSE (elt))); | |
5532 | else | |
5533 | warning ("anonymous %s declared inside parameter list", | |
5534 | (code == RECORD_TYPE ? "struct" | |
5535 | : code == UNION_TYPE ? "union" | |
5536 | : "enum")); | |
5537 | ||
51e29401 RS |
5538 | if (! already) |
5539 | { | |
5540 | warning ("its scope is only this definition or declaration,"); | |
5541 | warning ("which is probably not what you want."); | |
5542 | already = 1; | |
5543 | } | |
5544 | } | |
5545 | } | |
5546 | \f | |
5547 | /* Get the struct, enum or union (CODE says which) with tag NAME. | |
5548 | Define the tag as a forward-reference if it is not defined. */ | |
5549 | ||
5550 | tree | |
5551 | xref_tag (code, name) | |
5552 | enum tree_code code; | |
5553 | tree name; | |
5554 | { | |
5555 | int temporary = allocation_temporary_p (); | |
5556 | ||
5557 | /* If a cross reference is requested, look up the type | |
5558 | already defined for this tag and return it. */ | |
5559 | ||
5560 | register tree ref = lookup_tag (code, name, current_binding_level, 0); | |
5561 | /* Even if this is the wrong type of tag, return what we found. | |
5562 | There will be an error message anyway, from pending_xref_error. | |
5563 | If we create an empty xref just for an invalid use of the type, | |
929f3671 | 5564 | the main result is to create lots of superfluous error messages. */ |
51e29401 RS |
5565 | if (ref) |
5566 | return ref; | |
5567 | ||
5568 | push_obstacks_nochange (); | |
5569 | ||
5570 | if (current_binding_level == global_binding_level && temporary) | |
5571 | end_temporary_allocation (); | |
5572 | ||
5573 | /* If no such tag is yet defined, create a forward-reference node | |
5574 | and record it as the "definition". | |
5575 | When a real declaration of this type is found, | |
5576 | the forward-reference will be altered into a real type. */ | |
5577 | ||
5578 | ref = make_node (code); | |
5579 | if (code == ENUMERAL_TYPE) | |
5580 | { | |
5581 | /* (In ANSI, Enums can be referred to only if already defined.) */ | |
5582 | if (pedantic) | |
5583 | pedwarn ("ANSI C forbids forward references to `enum' types"); | |
5584 | /* Give the type a default layout like unsigned int | |
5585 | to avoid crashing if it does not get defined. */ | |
5586 | TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node); | |
5587 | TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node); | |
5588 | TREE_UNSIGNED (ref) = 1; | |
5589 | TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node); | |
5590 | TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node); | |
5591 | TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node); | |
5592 | } | |
5593 | ||
5594 | pushtag (name, ref); | |
5595 | ||
5596 | pop_obstacks (); | |
5597 | ||
5598 | return ref; | |
5599 | } | |
5600 | \f | |
5601 | /* Make sure that the tag NAME is defined *in the current binding level* | |
5602 | at least as a forward reference. | |
7a0347ff RS |
5603 | CODE says which kind of tag NAME ought to be. |
5604 | ||
5605 | We also do a push_obstacks_nochange | |
5606 | whose matching pop is in finish_struct. */ | |
51e29401 RS |
5607 | |
5608 | tree | |
5609 | start_struct (code, name) | |
5610 | enum tree_code code; | |
5611 | tree name; | |
5612 | { | |
5613 | /* If there is already a tag defined at this binding level | |
5614 | (as a forward reference), just return it. */ | |
5615 | ||
5616 | register tree ref = 0; | |
5617 | ||
7a0347ff RS |
5618 | push_obstacks_nochange (); |
5619 | if (current_binding_level == global_binding_level) | |
5620 | end_temporary_allocation (); | |
5621 | ||
51e29401 RS |
5622 | if (name != 0) |
5623 | ref = lookup_tag (code, name, current_binding_level, 1); | |
5624 | if (ref && TREE_CODE (ref) == code) | |
5625 | { | |
5626 | C_TYPE_BEING_DEFINED (ref) = 1; | |
5c19a356 | 5627 | TYPE_PACKED (ref) = flag_pack_struct; |
51e29401 RS |
5628 | if (TYPE_FIELDS (ref)) |
5629 | error ((code == UNION_TYPE ? "redefinition of `union %s'" | |
5630 | : "redefinition of `struct %s'"), | |
5631 | IDENTIFIER_POINTER (name)); | |
5632 | ||
5633 | return ref; | |
5634 | } | |
5635 | ||
5636 | /* Otherwise create a forward-reference just so the tag is in scope. */ | |
5637 | ||
5638 | ref = make_node (code); | |
5639 | pushtag (name, ref); | |
5640 | C_TYPE_BEING_DEFINED (ref) = 1; | |
02eb6e90 | 5641 | TYPE_PACKED (ref) = flag_pack_struct; |
51e29401 RS |
5642 | return ref; |
5643 | } | |
5644 | ||
5645 | /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted) | |
5646 | of a structure component, returning a FIELD_DECL node. | |
5647 | WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. | |
5648 | ||
5649 | This is done during the parsing of the struct declaration. | |
5650 | The FIELD_DECL nodes are chained together and the lot of them | |
5651 | are ultimately passed to `build_struct' to make the RECORD_TYPE node. */ | |
5652 | ||
5653 | tree | |
5654 | grokfield (filename, line, declarator, declspecs, width) | |
5655 | char *filename; | |
5656 | int line; | |
5657 | tree declarator, declspecs, width; | |
5658 | { | |
5659 | tree value; | |
5660 | ||
5661 | /* The corresponding pop_obstacks is in finish_decl. */ | |
5662 | push_obstacks_nochange (); | |
5663 | ||
5664 | value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0); | |
5665 | ||
8d9bfdc5 | 5666 | finish_decl (value, NULL_TREE, NULL_TREE); |
51e29401 RS |
5667 | DECL_INITIAL (value) = width; |
5668 | ||
abe31bf8 | 5669 | maybe_objc_check_decl (value); |
51e29401 RS |
5670 | return value; |
5671 | } | |
5672 | \f | |
5673 | /* Function to help qsort sort FIELD_DECLs by name order. */ | |
5674 | ||
5675 | static int | |
c6d40741 RK |
5676 | field_decl_cmp (xp, yp) |
5677 | const GENERIC_PTR xp; | |
5678 | const GENERIC_PTR yp; | |
51e29401 | 5679 | { |
c6d40741 RK |
5680 | tree *x = (tree *)xp, *y = (tree *)yp; |
5681 | ||
c3fac866 RK |
5682 | if (DECL_NAME (*x) == DECL_NAME (*y)) |
5683 | return 0; | |
5684 | if (DECL_NAME (*x) == NULL) | |
5685 | return -1; | |
5686 | if (DECL_NAME (*y) == NULL) | |
5687 | return 1; | |
5688 | if (DECL_NAME (*x) < DECL_NAME (*y)) | |
5689 | return -1; | |
5690 | return 1; | |
51e29401 RS |
5691 | } |
5692 | ||
5693 | /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T. | |
7a0347ff | 5694 | FIELDLIST is a chain of FIELD_DECL nodes for the fields. |
10861e9a | 5695 | ATTRIBUTES are attributes to be applied to the structure. |
7a0347ff RS |
5696 | |
5697 | We also do a pop_obstacks to match the push in start_struct. */ | |
51e29401 RS |
5698 | |
5699 | tree | |
10861e9a RK |
5700 | finish_struct (t, fieldlist, attributes) |
5701 | tree t; | |
5702 | tree fieldlist; | |
5703 | tree attributes; | |
51e29401 RS |
5704 | { |
5705 | register tree x; | |
5706 | int old_momentary; | |
5707 | int toplevel = global_binding_level == current_binding_level; | |
5708 | ||
5709 | /* If this type was previously laid out as a forward reference, | |
5710 | make sure we lay it out again. */ | |
5711 | ||
5712 | TYPE_SIZE (t) = 0; | |
5713 | ||
10861e9a RK |
5714 | decl_attributes (t, attributes, NULL_TREE); |
5715 | ||
51e29401 RS |
5716 | /* Nameless union parm types are useful as GCC extension. */ |
5717 | if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic) | |
5718 | /* Otherwise, warn about any struct or union def. in parmlist. */ | |
5719 | if (in_parm_level_p ()) | |
5720 | { | |
5721 | if (pedantic) | |
5722 | pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms" | |
5723 | : "structure defined inside parms")); | |
f3c2c111 | 5724 | else if (! flag_traditional) |
51e29401 RS |
5725 | warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms" |
5726 | : "structure defined inside parms")); | |
5727 | } | |
5728 | ||
5729 | old_momentary = suspend_momentary (); | |
5730 | ||
9590fa72 RK |
5731 | if (pedantic) |
5732 | { | |
5733 | for (x = fieldlist; x; x = TREE_CHAIN (x)) | |
5734 | if (DECL_NAME (x) != 0) | |
5735 | break; | |
5736 | ||
5737 | if (x == 0) | |
5738 | pedwarn ("%s has no %smembers", | |
5739 | (TREE_CODE (t) == UNION_TYPE ? "union" : "structure"), | |
5740 | (fieldlist ? "named " : "")); | |
5741 | } | |
51e29401 RS |
5742 | |
5743 | /* Install struct as DECL_CONTEXT of each field decl. | |
5744 | Also process specified field sizes. | |
77f934bb | 5745 | Set DECL_FIELD_SIZE to the specified size, or 0 if none specified. |
51e29401 RS |
5746 | The specified size is found in the DECL_INITIAL. |
5747 | Store 0 there, except for ": 0" fields (so we can find them | |
5748 | and delete them, below). */ | |
5749 | ||
5750 | for (x = fieldlist; x; x = TREE_CHAIN (x)) | |
5751 | { | |
5752 | DECL_CONTEXT (x) = t; | |
5be1df77 | 5753 | DECL_PACKED (x) |= TYPE_PACKED (t); |
77f934bb | 5754 | DECL_FIELD_SIZE (x) = 0; |
51e29401 RS |
5755 | |
5756 | /* If any field is const, the structure type is pseudo-const. */ | |
5757 | if (TREE_READONLY (x)) | |
5758 | C_TYPE_FIELDS_READONLY (t) = 1; | |
5759 | else | |
5760 | { | |
5761 | /* A field that is pseudo-const makes the structure likewise. */ | |
5762 | tree t1 = TREE_TYPE (x); | |
5763 | while (TREE_CODE (t1) == ARRAY_TYPE) | |
5764 | t1 = TREE_TYPE (t1); | |
5765 | if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE) | |
5766 | && C_TYPE_FIELDS_READONLY (t1)) | |
5767 | C_TYPE_FIELDS_READONLY (t) = 1; | |
5768 | } | |
5769 | ||
5770 | /* Any field that is volatile means variables of this type must be | |
5771 | treated in some ways as volatile. */ | |
5772 | if (TREE_THIS_VOLATILE (x)) | |
5773 | C_TYPE_FIELDS_VOLATILE (t) = 1; | |
5774 | ||
5775 | /* Any field of nominal variable size implies structure is too. */ | |
5776 | if (C_DECL_VARIABLE_SIZE (x)) | |
5777 | C_TYPE_VARIABLE_SIZE (t) = 1; | |
5778 | ||
8d7bbe5f RS |
5779 | /* Detect invalid nested redefinition. */ |
5780 | if (TREE_TYPE (x) == t) | |
5781 | error ("nested redefinition of `%s'", | |
5782 | IDENTIFIER_POINTER (TYPE_NAME (t))); | |
5783 | ||
51e29401 | 5784 | /* Detect invalid bit-field size. */ |
07c5ab55 RS |
5785 | if (DECL_INITIAL (x)) |
5786 | STRIP_NOPS (DECL_INITIAL (x)); | |
90374cc2 | 5787 | if (DECL_INITIAL (x)) |
e681c5a1 RS |
5788 | { |
5789 | if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST) | |
5790 | constant_expression_warning (DECL_INITIAL (x)); | |
5791 | else | |
5792 | { | |
5793 | error_with_decl (x, "bit-field `%s' width not an integer constant"); | |
5794 | DECL_INITIAL (x) = NULL; | |
5795 | } | |
5796 | } | |
51e29401 RS |
5797 | |
5798 | /* Detect invalid bit-field type. */ | |
5799 | if (DECL_INITIAL (x) | |
5800 | && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE | |
5801 | && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE) | |
5802 | { | |
5803 | error_with_decl (x, "bit-field `%s' has invalid type"); | |
5804 | DECL_INITIAL (x) = NULL; | |
5805 | } | |
5806 | if (DECL_INITIAL (x) && pedantic | |
5807 | && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node | |
61df2ee2 RS |
5808 | && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node |
5809 | /* Accept an enum that's equivalent to int or unsigned int. */ | |
5810 | && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE | |
5811 | && (TYPE_PRECISION (TREE_TYPE (x)) | |
5812 | == TYPE_PRECISION (integer_type_node)))) | |
51e29401 RS |
5813 | pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C"); |
5814 | ||
5815 | /* Detect and ignore out of range field width. */ | |
5816 | if (DECL_INITIAL (x)) | |
5817 | { | |
2d724389 | 5818 | unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x)); |
51e29401 | 5819 | |
6aa10371 | 5820 | if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0) |
51e29401 RS |
5821 | { |
5822 | DECL_INITIAL (x) = NULL; | |
5823 | error_with_decl (x, "negative width in bit-field `%s'"); | |
5824 | } | |
2d724389 RS |
5825 | else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0 |
5826 | || width > TYPE_PRECISION (TREE_TYPE (x))) | |
51e29401 | 5827 | { |
51e29401 | 5828 | DECL_INITIAL (x) = NULL; |
2d724389 | 5829 | pedwarn_with_decl (x, "width of `%s' exceeds its type"); |
51e29401 | 5830 | } |
2d724389 | 5831 | else if (width == 0 && DECL_NAME (x) != 0) |
51e29401 | 5832 | { |
2d724389 | 5833 | error_with_decl (x, "zero width for bit-field `%s'"); |
51e29401 | 5834 | DECL_INITIAL (x) = NULL; |
51e29401 RS |
5835 | } |
5836 | } | |
5837 | ||
5838 | /* Process valid field width. */ | |
5839 | if (DECL_INITIAL (x)) | |
5840 | { | |
5841 | register int width = TREE_INT_CST_LOW (DECL_INITIAL (x)); | |
5842 | ||
ed244fc2 RK |
5843 | if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE |
5844 | && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)), | |
5845 | TREE_UNSIGNED (TREE_TYPE (x))) | |
5846 | || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)), | |
5847 | TREE_UNSIGNED (TREE_TYPE (x))))) | |
5848 | warning_with_decl (x, "`%s' is narrower than values of its type"); | |
5849 | ||
77f934bb | 5850 | DECL_FIELD_SIZE (x) = width; |
64d60f91 | 5851 | DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1; |
51e29401 RS |
5852 | DECL_INITIAL (x) = NULL; |
5853 | ||
5854 | if (width == 0) | |
5855 | { | |
5856 | /* field size 0 => force desired amount of alignment. */ | |
5857 | #ifdef EMPTY_FIELD_BOUNDARY | |
5858 | DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY); | |
5859 | #endif | |
5860 | #ifdef PCC_BITFIELD_TYPE_MATTERS | |
1507aa74 RK |
5861 | if (PCC_BITFIELD_TYPE_MATTERS) |
5862 | DECL_ALIGN (x) = MAX (DECL_ALIGN (x), | |
5863 | TYPE_ALIGN (TREE_TYPE (x))); | |
51e29401 RS |
5864 | #endif |
5865 | } | |
5866 | } | |
34322499 | 5867 | else if (TREE_TYPE (x) != error_mark_node) |
ec2343c4 | 5868 | { |
f8344bea | 5869 | unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT |
ec2343c4 MM |
5870 | : TYPE_ALIGN (TREE_TYPE (x))); |
5871 | /* Non-bit-fields are aligned for their type, except packed | |
5872 | fields which require only BITS_PER_UNIT alignment. */ | |
5873 | DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align); | |
5874 | } | |
51e29401 RS |
5875 | } |
5876 | ||
5877 | /* Now DECL_INITIAL is null on all members. */ | |
5878 | ||
5879 | /* Delete all duplicate fields from the fieldlist */ | |
5880 | for (x = fieldlist; x && TREE_CHAIN (x);) | |
5881 | /* Anonymous fields aren't duplicates. */ | |
5882 | if (DECL_NAME (TREE_CHAIN (x)) == 0) | |
5883 | x = TREE_CHAIN (x); | |
5884 | else | |
5885 | { | |
5886 | register tree y = fieldlist; | |
5887 | ||
5888 | while (1) | |
5889 | { | |
5890 | if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x))) | |
5891 | break; | |
5892 | if (y == x) | |
5893 | break; | |
5894 | y = TREE_CHAIN (y); | |
5895 | } | |
5896 | if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x))) | |
5897 | { | |
5898 | error_with_decl (TREE_CHAIN (x), "duplicate member `%s'"); | |
5899 | TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x)); | |
5900 | } | |
5901 | else x = TREE_CHAIN (x); | |
5902 | } | |
5903 | ||
5904 | /* Now we have the nearly final fieldlist. Record it, | |
5905 | then lay out the structure or union (including the fields). */ | |
5906 | ||
5907 | TYPE_FIELDS (t) = fieldlist; | |
5908 | ||
5909 | layout_type (t); | |
5910 | ||
5911 | /* Delete all zero-width bit-fields from the front of the fieldlist */ | |
5912 | while (fieldlist | |
5913 | && DECL_INITIAL (fieldlist)) | |
5914 | fieldlist = TREE_CHAIN (fieldlist); | |
5915 | /* Delete all such members from the rest of the fieldlist */ | |
5916 | for (x = fieldlist; x;) | |
5917 | { | |
5918 | if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x))) | |
5919 | TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x)); | |
5920 | else x = TREE_CHAIN (x); | |
5921 | } | |
5922 | ||
5923 | /* Now we have the truly final field list. | |
5924 | Store it in this type and in the variants. */ | |
5925 | ||
5926 | TYPE_FIELDS (t) = fieldlist; | |
5927 | ||
5928 | /* If there are lots of fields, sort so we can look through them fast. | |
5929 | We arbitrarily consider 16 or more elts to be "a lot". */ | |
5930 | { | |
5931 | int len = 0; | |
5932 | ||
5933 | for (x = fieldlist; x; x = TREE_CHAIN (x)) | |
5934 | { | |
5935 | if (len > 15) | |
5936 | break; | |
5937 | len += 1; | |
5938 | } | |
5939 | if (len > 15) | |
5940 | { | |
5941 | tree *field_array; | |
5942 | char *space; | |
5943 | ||
5944 | len += list_length (x); | |
5945 | /* Use the same allocation policy here that make_node uses, to | |
5946 | ensure that this lives as long as the rest of the struct decl. | |
5947 | All decls in an inline function need to be saved. */ | |
5948 | if (allocation_temporary_p ()) | |
5949 | space = savealloc (sizeof (struct lang_type) + len * sizeof (tree)); | |
5950 | else | |
5951 | space = oballoc (sizeof (struct lang_type) + len * sizeof (tree)); | |
5952 | ||
5953 | TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space; | |
5954 | TYPE_LANG_SPECIFIC (t)->len = len; | |
5955 | ||
5956 | field_array = &TYPE_LANG_SPECIFIC (t)->elts[0]; | |
5957 | len = 0; | |
5958 | for (x = fieldlist; x; x = TREE_CHAIN (x)) | |
5959 | field_array[len++] = x; | |
5960 | ||
5961 | qsort (field_array, len, sizeof (tree), field_decl_cmp); | |
5962 | } | |
5963 | } | |
5964 | ||
5965 | for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x)) | |
5966 | { | |
5967 | TYPE_FIELDS (x) = TYPE_FIELDS (t); | |
5968 | TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t); | |
5969 | TYPE_ALIGN (x) = TYPE_ALIGN (t); | |
5970 | } | |
5971 | ||
1604422c RK |
5972 | /* If this was supposed to be a transparent union, but we can't |
5973 | make it one, warn and turn off the flag. */ | |
5974 | if (TREE_CODE (t) == UNION_TYPE | |
5975 | && TYPE_TRANSPARENT_UNION (t) | |
5976 | && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))) | |
5977 | { | |
5978 | TYPE_TRANSPARENT_UNION (t) = 0; | |
d787aad9 | 5979 | warning ("union cannot be made transparent"); |
1604422c RK |
5980 | } |
5981 | ||
51e29401 RS |
5982 | /* If this structure or union completes the type of any previous |
5983 | variable declaration, lay it out and output its rtl. */ | |
5984 | ||
5985 | if (current_binding_level->n_incomplete != 0) | |
5986 | { | |
5987 | tree decl; | |
5988 | for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl)) | |
5989 | { | |
5990 | if (TREE_TYPE (decl) == t | |
5991 | && TREE_CODE (decl) != TYPE_DECL) | |
5992 | { | |
5993 | layout_decl (decl, 0); | |
5994 | /* This is a no-op in c-lang.c or something real in objc-actions.c. */ | |
5995 | maybe_objc_check_decl (decl); | |
8d9bfdc5 | 5996 | rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0); |
51e29401 RS |
5997 | if (! toplevel) |
5998 | expand_decl (decl); | |
5999 | --current_binding_level->n_incomplete; | |
6000 | } | |
6001 | else if (TYPE_SIZE (TREE_TYPE (decl)) == 0 | |
6002 | && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE) | |
6003 | { | |
6004 | tree element = TREE_TYPE (decl); | |
6005 | while (TREE_CODE (element) == ARRAY_TYPE) | |
6006 | element = TREE_TYPE (element); | |
6007 | if (element == t) | |
6008 | layout_array_type (TREE_TYPE (decl)); | |
6009 | } | |
6010 | } | |
6011 | } | |
6012 | ||
6013 | resume_momentary (old_momentary); | |
6014 | ||
6015 | /* Finish debugging output for this type. */ | |
6016 | rest_of_type_compilation (t, toplevel); | |
6017 | ||
7a0347ff RS |
6018 | /* The matching push is in start_struct. */ |
6019 | pop_obstacks (); | |
6020 | ||
51e29401 RS |
6021 | return t; |
6022 | } | |
6023 | ||
6024 | /* Lay out the type T, and its element type, and so on. */ | |
6025 | ||
6026 | static void | |
6027 | layout_array_type (t) | |
6028 | tree t; | |
6029 | { | |
6030 | if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE) | |
6031 | layout_array_type (TREE_TYPE (t)); | |
6032 | layout_type (t); | |
6033 | } | |
6034 | \f | |
6035 | /* Begin compiling the definition of an enumeration type. | |
6036 | NAME is its name (or null if anonymous). | |
6037 | Returns the type object, as yet incomplete. | |
6038 | Also records info about it so that build_enumerator | |
6039 | may be used to declare the individual values as they are read. */ | |
6040 | ||
6041 | tree | |
6042 | start_enum (name) | |
6043 | tree name; | |
6044 | { | |
6045 | register tree enumtype = 0; | |
6046 | ||
6047 | /* If this is the real definition for a previous forward reference, | |
6048 | fill in the contents in the same object that used to be the | |
6049 | forward reference. */ | |
6050 | ||
6051 | if (name != 0) | |
6052 | enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1); | |
6053 | ||
7a0347ff RS |
6054 | /* The corresponding pop_obstacks is in finish_enum. */ |
6055 | push_obstacks_nochange (); | |
6056 | /* If these symbols and types are global, make them permanent. */ | |
6057 | if (current_binding_level == global_binding_level) | |
6058 | end_temporary_allocation (); | |
6059 | ||
51e29401 RS |
6060 | if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE) |
6061 | { | |
6062 | enumtype = make_node (ENUMERAL_TYPE); | |
6063 | pushtag (name, enumtype); | |
6064 | } | |
6065 | ||
6066 | C_TYPE_BEING_DEFINED (enumtype) = 1; | |
6067 | ||
6068 | if (TYPE_VALUES (enumtype) != 0) | |
6069 | { | |
6070 | /* This enum is a named one that has been declared already. */ | |
6071 | error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name)); | |
6072 | ||
6073 | /* Completely replace its old definition. | |
6074 | The old enumerators remain defined, however. */ | |
6075 | TYPE_VALUES (enumtype) = 0; | |
6076 | } | |
6077 | ||
6078 | enum_next_value = integer_zero_node; | |
93e3ba4f | 6079 | enum_overflow = 0; |
51e29401 | 6080 | |
02eb6e90 RK |
6081 | if (flag_short_enums) |
6082 | TYPE_PACKED (enumtype) = 1; | |
6083 | ||
51e29401 RS |
6084 | return enumtype; |
6085 | } | |
6086 | ||
6087 | /* After processing and defining all the values of an enumeration type, | |
6088 | install their decls in the enumeration type and finish it off. | |
10861e9a RK |
6089 | ENUMTYPE is the type object, VALUES a list of decl-value pairs, |
6090 | and ATTRIBUTES are the specified attributes. | |
51e29401 RS |
6091 | Returns ENUMTYPE. */ |
6092 | ||
6093 | tree | |
10861e9a RK |
6094 | finish_enum (enumtype, values, attributes) |
6095 | tree enumtype; | |
6096 | tree values; | |
6097 | tree attributes; | |
51e29401 | 6098 | { |
fbe23ee7 | 6099 | register tree pair, tem; |
51e29401 | 6100 | tree minnode = 0, maxnode = 0; |
de953b38 | 6101 | int lowprec, highprec, precision; |
51e29401 RS |
6102 | int toplevel = global_binding_level == current_binding_level; |
6103 | ||
6104 | if (in_parm_level_p ()) | |
6105 | warning ("enum defined inside parms"); | |
6106 | ||
10861e9a RK |
6107 | decl_attributes (enumtype, attributes, NULL_TREE); |
6108 | ||
51e29401 RS |
6109 | /* Calculate the maximum value of any enumerator in this type. */ |
6110 | ||
59116212 RK |
6111 | if (values == error_mark_node) |
6112 | minnode = maxnode = integer_zero_node; | |
6113 | else | |
6114 | for (pair = values; pair; pair = TREE_CHAIN (pair)) | |
6115 | { | |
6116 | tree value = TREE_VALUE (pair); | |
6117 | if (pair == values) | |
6118 | minnode = maxnode = TREE_VALUE (pair); | |
6119 | else | |
6120 | { | |
6121 | if (tree_int_cst_lt (maxnode, value)) | |
6122 | maxnode = value; | |
6123 | if (tree_int_cst_lt (value, minnode)) | |
6124 | minnode = value; | |
6125 | } | |
6126 | } | |
51e29401 RS |
6127 | |
6128 | TYPE_MIN_VALUE (enumtype) = minnode; | |
6129 | TYPE_MAX_VALUE (enumtype) = maxnode; | |
6130 | ||
de953b38 RK |
6131 | /* An enum can have some negative values; then it is signed. */ |
6132 | TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0; | |
51e29401 | 6133 | |
de953b38 | 6134 | /* Determine the precision this type needs. */ |
51e29401 | 6135 | |
de953b38 RK |
6136 | lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype)); |
6137 | highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype)); | |
6138 | precision = MAX (lowprec, highprec); | |
51e29401 | 6139 | |
02eb6e90 | 6140 | if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node)) |
f500253d RK |
6141 | { |
6142 | tree narrowest = type_for_size (precision, 1); | |
6143 | if (narrowest == 0) | |
6144 | { | |
6145 | warning ("enumeration values exceed range of largest integer"); | |
6146 | narrowest = long_long_integer_type_node; | |
6147 | } | |
6148 | ||
6149 | TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest); | |
6150 | } | |
51e29401 RS |
6151 | else |
6152 | TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node); | |
6153 | ||
6154 | TYPE_SIZE (enumtype) = 0; | |
6155 | layout_type (enumtype); | |
6156 | ||
59116212 | 6157 | if (values != error_mark_node) |
75b46437 | 6158 | { |
59116212 RK |
6159 | /* Change the type of the enumerators to be the enum type. |
6160 | Formerly this was done only for enums that fit in an int, | |
6161 | but the comment said it was done only for enums wider than int. | |
6162 | It seems necessary to do this for wide enums, | |
6163 | and best not to change what's done for ordinary narrower ones. */ | |
6164 | for (pair = values; pair; pair = TREE_CHAIN (pair)) | |
6165 | { | |
6166 | TREE_TYPE (TREE_PURPOSE (pair)) = enumtype; | |
6167 | DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype); | |
6168 | if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL) | |
6169 | DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype); | |
6170 | } | |
51e29401 | 6171 | |
59116212 RK |
6172 | /* Replace the decl nodes in VALUES with their names. */ |
6173 | for (pair = values; pair; pair = TREE_CHAIN (pair)) | |
6174 | TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair)); | |
51e29401 | 6175 | |
59116212 RK |
6176 | TYPE_VALUES (enumtype) = values; |
6177 | } | |
51e29401 | 6178 | |
fbe23ee7 RS |
6179 | /* Fix up all variant types of this enum type. */ |
6180 | for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem)) | |
6181 | { | |
6182 | TYPE_VALUES (tem) = TYPE_VALUES (enumtype); | |
6183 | TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype); | |
6184 | TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype); | |
6185 | TYPE_SIZE (tem) = TYPE_SIZE (enumtype); | |
6186 | TYPE_MODE (tem) = TYPE_MODE (enumtype); | |
6187 | TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype); | |
6188 | TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype); | |
6189 | TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype); | |
6190 | } | |
6191 | ||
51e29401 RS |
6192 | /* Finish debugging output for this type. */ |
6193 | rest_of_type_compilation (enumtype, toplevel); | |
6194 | ||
7a0347ff RS |
6195 | /* This matches a push in start_enum. */ |
6196 | pop_obstacks (); | |
6197 | ||
51e29401 RS |
6198 | return enumtype; |
6199 | } | |
6200 | ||
6201 | /* Build and install a CONST_DECL for one value of the | |
6202 | current enumeration type (one that was begun with start_enum). | |
6203 | Return a tree-list containing the CONST_DECL and its value. | |
6204 | Assignment of sequential values by default is handled here. */ | |
6205 | ||
6206 | tree | |
6207 | build_enumerator (name, value) | |
6208 | tree name, value; | |
6209 | { | |
75b46437 | 6210 | register tree decl, type; |
51e29401 RS |
6211 | |
6212 | /* Validate and default VALUE. */ | |
6213 | ||
6214 | /* Remove no-op casts from the value. */ | |
cd7a1451 | 6215 | if (value) |
874a7be1 | 6216 | STRIP_TYPE_NOPS (value); |
51e29401 | 6217 | |
90374cc2 | 6218 | if (value != 0) |
e681c5a1 RS |
6219 | { |
6220 | if (TREE_CODE (value) == INTEGER_CST) | |
25a1019f RK |
6221 | { |
6222 | value = default_conversion (value); | |
6223 | constant_expression_warning (value); | |
6224 | } | |
e681c5a1 RS |
6225 | else |
6226 | { | |
6227 | error ("enumerator value for `%s' not integer constant", | |
6228 | IDENTIFIER_POINTER (name)); | |
6229 | value = 0; | |
6230 | } | |
6231 | } | |
51e29401 RS |
6232 | |
6233 | /* Default based on previous value. */ | |
6234 | /* It should no longer be possible to have NON_LVALUE_EXPR | |
6235 | in the default. */ | |
6236 | if (value == 0) | |
93e3ba4f RS |
6237 | { |
6238 | value = enum_next_value; | |
6239 | if (enum_overflow) | |
6240 | error ("overflow in enumeration values"); | |
6241 | } | |
51e29401 RS |
6242 | |
6243 | if (pedantic && ! int_fits_type_p (value, integer_type_node)) | |
6244 | { | |
6245 | pedwarn ("ANSI C restricts enumerator values to range of `int'"); | |
6246 | value = integer_zero_node; | |
6247 | } | |
6248 | ||
6249 | /* Set basis for default for next value. */ | |
6250 | enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0); | |
93e3ba4f | 6251 | enum_overflow = tree_int_cst_lt (enum_next_value, value); |
51e29401 RS |
6252 | |
6253 | /* Now create a declaration for the enum value name. */ | |
6254 | ||
75b46437 RS |
6255 | type = TREE_TYPE (value); |
6256 | type = type_for_size (MAX (TYPE_PRECISION (type), | |
6257 | TYPE_PRECISION (integer_type_node)), | |
6258 | ((flag_traditional | |
6259 | || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node)) | |
6260 | && TREE_UNSIGNED (type))); | |
6261 | ||
6262 | decl = build_decl (CONST_DECL, name, type); | |
51e29401 | 6263 | DECL_INITIAL (decl) = value; |
75b46437 | 6264 | TREE_TYPE (value) = type; |
51e29401 RS |
6265 | pushdecl (decl); |
6266 | ||
8d9bfdc5 | 6267 | return saveable_tree_cons (decl, value, NULL_TREE); |
51e29401 RS |
6268 | } |
6269 | \f | |
6270 | /* Create the FUNCTION_DECL for a function definition. | |
5730cf69 RK |
6271 | DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of |
6272 | the declaration; they describe the function's name and the type it returns, | |
51e29401 RS |
6273 | but twisted together in a fashion that parallels the syntax of C. |
6274 | ||
6275 | This function creates a binding context for the function body | |
6276 | as well as setting up the FUNCTION_DECL in current_function_decl. | |
6277 | ||
6278 | Returns 1 on success. If the DECLARATOR is not suitable for a function | |
6279 | (it defines a datum instead), we return 0, which tells | |
6280 | yyparse to report a parse error. | |
6281 | ||
6282 | NESTED is nonzero for a function nested within another function. */ | |
6283 | ||
6284 | int | |
5730cf69 RK |
6285 | start_function (declspecs, declarator, prefix_attributes, attributes, nested) |
6286 | tree declarator, declspecs, prefix_attributes, attributes; | |
51e29401 RS |
6287 | int nested; |
6288 | { | |
6289 | tree decl1, old_decl; | |
6290 | tree restype; | |
5415b705 | 6291 | int old_immediate_size_expand = immediate_size_expand; |
51e29401 | 6292 | |
0f41302f | 6293 | current_function_returns_value = 0; /* Assume, until we see it does. */ |
51e29401 RS |
6294 | current_function_returns_null = 0; |
6295 | warn_about_return_type = 0; | |
6296 | current_extern_inline = 0; | |
6297 | c_function_varargs = 0; | |
6298 | named_labels = 0; | |
6299 | shadowed_labels = 0; | |
6300 | ||
5415b705 RK |
6301 | /* Don't expand any sizes in the return type of the function. */ |
6302 | immediate_size_expand = 0; | |
6303 | ||
51e29401 RS |
6304 | decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1); |
6305 | ||
6306 | /* If the declarator is not suitable for a function definition, | |
6307 | cause a syntax error. */ | |
6308 | if (decl1 == 0) | |
e9a25f70 JL |
6309 | { |
6310 | immediate_size_expand = old_immediate_size_expand; | |
6311 | return 0; | |
6312 | } | |
51e29401 | 6313 | |
5730cf69 | 6314 | decl_attributes (decl1, prefix_attributes, attributes); |
7665dfd4 | 6315 | |
51e29401 RS |
6316 | announce_function (decl1); |
6317 | ||
6318 | if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0) | |
6319 | { | |
6320 | error ("return-type is an incomplete type"); | |
6321 | /* Make it return void instead. */ | |
6322 | TREE_TYPE (decl1) | |
6323 | = build_function_type (void_type_node, | |
6324 | TYPE_ARG_TYPES (TREE_TYPE (decl1))); | |
6325 | } | |
6326 | ||
6327 | if (warn_about_return_type) | |
6328 | warning ("return-type defaults to `int'"); | |
6329 | ||
6330 | /* Save the parm names or decls from this function's declarator | |
6331 | where store_parm_decls will find them. */ | |
6332 | current_function_parms = last_function_parms; | |
6333 | current_function_parm_tags = last_function_parm_tags; | |
6334 | ||
6335 | /* Make the init_value nonzero so pushdecl knows this is not tentative. | |
6336 | error_mark_node is replaced below (in poplevel) with the BLOCK. */ | |
6337 | DECL_INITIAL (decl1) = error_mark_node; | |
6338 | ||
6339 | /* If this definition isn't a prototype and we had a prototype declaration | |
6340 | before, copy the arg type info from that prototype. | |
6341 | But not if what we had before was a builtin function. */ | |
6342 | old_decl = lookup_name_current_level (DECL_NAME (decl1)); | |
6343 | if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE | |
6344 | && !DECL_BUILT_IN (old_decl) | |
fa7d8b92 RK |
6345 | && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1))) |
6346 | == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl)))) | |
51e29401 | 6347 | && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0) |
50a9145c JW |
6348 | { |
6349 | TREE_TYPE (decl1) = TREE_TYPE (old_decl); | |
6350 | current_function_prototype_file = DECL_SOURCE_FILE (old_decl); | |
6351 | current_function_prototype_line = DECL_SOURCE_LINE (old_decl); | |
6352 | } | |
51e29401 | 6353 | |
6fc7c517 JW |
6354 | /* If there is no explicit declaration, look for any out-of-scope implicit |
6355 | declarations. */ | |
6356 | if (old_decl == 0) | |
6357 | old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)); | |
6358 | ||
51e29401 RS |
6359 | /* Optionally warn of old-fashioned def with no previous prototype. */ |
6360 | if (warn_strict_prototypes | |
6361 | && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0 | |
6362 | && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)) | |
6363 | warning ("function declaration isn't a prototype"); | |
6364 | /* Optionally warn of any global def with no previous prototype. */ | |
6365 | else if (warn_missing_prototypes | |
6366 | && TREE_PUBLIC (decl1) | |
39ab948e RS |
6367 | && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0) |
6368 | && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1)))) | |
51e29401 RS |
6369 | warning_with_decl (decl1, "no previous prototype for `%s'"); |
6370 | /* Optionally warn of any def with no previous prototype | |
6371 | if the function has already been used. */ | |
6372 | else if (warn_missing_prototypes | |
6373 | && old_decl != 0 && TREE_USED (old_decl) | |
6fc7c517 | 6374 | && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0) |
1474fe46 RK |
6375 | warning_with_decl (decl1, |
6376 | "`%s' was used with no prototype before its definition"); | |
6377 | /* Optionally warn of any global def with no previous declaration. */ | |
6378 | else if (warn_missing_declarations | |
6379 | && TREE_PUBLIC (decl1) | |
6380 | && old_decl == 0 | |
6381 | && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1)))) | |
6382 | warning_with_decl (decl1, "no previous declaration for `%s'"); | |
6383 | /* Optionally warn of any def with no previous declaration | |
6384 | if the function has already been used. */ | |
6385 | else if (warn_missing_declarations | |
6fc7c517 JW |
6386 | && old_decl != 0 && TREE_USED (old_decl) |
6387 | && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1))) | |
1474fe46 RK |
6388 | warning_with_decl (decl1, |
6389 | "`%s' was used with no declaration before its definition"); | |
51e29401 RS |
6390 | |
6391 | /* This is a definition, not a reference. | |
1394aabd | 6392 | So normally clear DECL_EXTERNAL. |
51e29401 | 6393 | However, `extern inline' acts like a declaration |
1394aabd RS |
6394 | except for defining how to inline. So set DECL_EXTERNAL in that case. */ |
6395 | DECL_EXTERNAL (decl1) = current_extern_inline; | |
51e29401 RS |
6396 | |
6397 | /* This function exists in static storage. | |
6398 | (This does not mean `static' in the C sense!) */ | |
6399 | TREE_STATIC (decl1) = 1; | |
6400 | ||
6401 | /* A nested function is not global. */ | |
6402 | if (current_function_decl != 0) | |
6403 | TREE_PUBLIC (decl1) = 0; | |
6404 | ||
b8705e61 RK |
6405 | /* Warn for unlikely, improbable, or stupid declarations of `main'. */ |
6406 | if (warn_main | |
6407 | && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0) | |
6408 | { | |
6409 | tree args; | |
6410 | int argct = 0; | |
6411 | ||
6412 | if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1))) | |
6413 | != integer_type_node) | |
a01dce9a | 6414 | pedwarn_with_decl (decl1, "return type of `%s' is not `int'"); |
b8705e61 RK |
6415 | |
6416 | for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args; | |
6417 | args = TREE_CHAIN (args)) | |
6418 | { | |
6419 | tree type = args ? TREE_VALUE (args) : 0; | |
6420 | ||
6421 | if (type == void_type_node) | |
6422 | break; | |
6423 | ||
6424 | ++argct; | |
6425 | switch (argct) | |
6426 | { | |
6427 | case 1: | |
6428 | if (TYPE_MAIN_VARIANT (type) != integer_type_node) | |
6429 | pedwarn_with_decl (decl1, | |
6430 | "first argument of `%s' should be `int'"); | |
6431 | break; | |
6432 | ||
6433 | case 2: | |
6434 | if (TREE_CODE (type) != POINTER_TYPE | |
6435 | || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE | |
6436 | || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type))) | |
6437 | != char_type_node)) | |
6438 | pedwarn_with_decl (decl1, | |
6439 | "second argument of `%s' should be `char **'"); | |
6440 | break; | |
6441 | ||
6442 | case 3: | |
6443 | if (TREE_CODE (type) != POINTER_TYPE | |
6444 | || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE | |
6445 | || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type))) | |
6446 | != char_type_node)) | |
6447 | pedwarn_with_decl (decl1, | |
6448 | "third argument of `%s' should probably be `char **'"); | |
6449 | break; | |
6450 | } | |
d71f83ca | 6451 | } |
b8705e61 | 6452 | |
d71f83ca RK |
6453 | /* It is intentional that this message does not mention the third |
6454 | argument, which is warned for only pedantically, because it's | |
6455 | blessed by mention in an appendix of the standard. */ | |
6456 | if (argct > 0 && (argct < 2 || argct > 3)) | |
6457 | pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments"); | |
b8705e61 | 6458 | |
d71f83ca RK |
6459 | if (argct == 3 && pedantic) |
6460 | pedwarn_with_decl (decl1, "third argument of `%s' is deprecated"); | |
b8705e61 RK |
6461 | |
6462 | if (! TREE_PUBLIC (decl1)) | |
6463 | pedwarn_with_decl (decl1, "`%s' is normally a non-static function"); | |
6464 | } | |
6465 | ||
51e29401 RS |
6466 | /* Record the decl so that the function name is defined. |
6467 | If we already have a decl for this name, and it is a FUNCTION_DECL, | |
6468 | use the old decl. */ | |
6469 | ||
6470 | current_function_decl = pushdecl (decl1); | |
6471 | ||
6472 | pushlevel (0); | |
6473 | declare_parm_level (1); | |
6474 | current_binding_level->subblocks_tag_transparent = 1; | |
6475 | ||
6476 | make_function_rtl (current_function_decl); | |
6477 | ||
6478 | restype = TREE_TYPE (TREE_TYPE (current_function_decl)); | |
6479 | /* Promote the value to int before returning it. */ | |
24bc4c7f | 6480 | if (C_PROMOTING_INTEGER_TYPE_P (restype)) |
42dfa47f RS |
6481 | { |
6482 | /* It retains unsignedness if traditional | |
6483 | or if not really getting wider. */ | |
6484 | if (TREE_UNSIGNED (restype) | |
6485 | && (flag_traditional | |
6486 | || (TYPE_PRECISION (restype) | |
6487 | == TYPE_PRECISION (integer_type_node)))) | |
6488 | restype = unsigned_type_node; | |
6489 | else | |
6490 | restype = integer_type_node; | |
6491 | } | |
8d9bfdc5 RK |
6492 | DECL_RESULT (current_function_decl) |
6493 | = build_decl (RESULT_DECL, NULL_TREE, restype); | |
51e29401 RS |
6494 | |
6495 | if (!nested) | |
6496 | /* Allocate further tree nodes temporarily during compilation | |
6497 | of this function only. */ | |
6498 | temporary_allocation (); | |
6499 | ||
6500 | /* If this fcn was already referenced via a block-scope `extern' decl | |
6501 | (or an implicit decl), propagate certain information about the usage. */ | |
6502 | if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl))) | |
6503 | TREE_ADDRESSABLE (current_function_decl) = 1; | |
6504 | ||
5415b705 RK |
6505 | immediate_size_expand = old_immediate_size_expand; |
6506 | ||
51e29401 RS |
6507 | return 1; |
6508 | } | |
6509 | ||
6510 | /* Record that this function is going to be a varargs function. | |
6511 | This is called before store_parm_decls, which is too early | |
6512 | to call mark_varargs directly. */ | |
6513 | ||
6514 | void | |
6515 | c_mark_varargs () | |
6516 | { | |
6517 | c_function_varargs = 1; | |
6518 | } | |
6519 | \f | |
6520 | /* Store the parameter declarations into the current function declaration. | |
6521 | This is called after parsing the parameter declarations, before | |
6522 | digesting the body of the function. | |
6523 | ||
6524 | For an old-style definition, modify the function's type | |
6525 | to specify at least the number of arguments. */ | |
6526 | ||
6527 | void | |
6528 | store_parm_decls () | |
6529 | { | |
6530 | register tree fndecl = current_function_decl; | |
6531 | register tree parm; | |
6532 | ||
6533 | /* This is either a chain of PARM_DECLs (if a prototype was used) | |
6534 | or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */ | |
6535 | tree specparms = current_function_parms; | |
6536 | ||
6537 | /* This is a list of types declared among parms in a prototype. */ | |
6538 | tree parmtags = current_function_parm_tags; | |
6539 | ||
6540 | /* This is a chain of PARM_DECLs from old-style parm declarations. */ | |
6541 | register tree parmdecls = getdecls (); | |
6542 | ||
6543 | /* This is a chain of any other decls that came in among the parm | |
6544 | declarations. If a parm is declared with enum {foo, bar} x; | |
6545 | then CONST_DECLs for foo and bar are put here. */ | |
6546 | tree nonparms = 0; | |
6547 | ||
6548 | /* Nonzero if this definition is written with a prototype. */ | |
6549 | int prototype = 0; | |
6550 | ||
6551 | if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST) | |
6552 | { | |
6553 | /* This case is when the function was defined with an ANSI prototype. | |
6554 | The parms already have decls, so we need not do anything here | |
6555 | except record them as in effect | |
6556 | and complain if any redundant old-style parm decls were written. */ | |
6557 | ||
6558 | register tree next; | |
6559 | tree others = 0; | |
6560 | ||
6561 | prototype = 1; | |
6562 | ||
6563 | if (parmdecls != 0) | |
7a0347ff RS |
6564 | { |
6565 | tree decl, link; | |
6566 | ||
6567 | error_with_decl (fndecl, | |
6568 | "parm types given both in parmlist and separately"); | |
6569 | /* Get rid of the erroneous decls; don't keep them on | |
6570 | the list of parms, since they might not be PARM_DECLs. */ | |
6571 | for (decl = current_binding_level->names; | |
6572 | decl; decl = TREE_CHAIN (decl)) | |
6573 | if (DECL_NAME (decl)) | |
6574 | IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0; | |
6575 | for (link = current_binding_level->shadowed; | |
6576 | link; link = TREE_CHAIN (link)) | |
6577 | IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link); | |
6578 | current_binding_level->names = 0; | |
6579 | current_binding_level->shadowed = 0; | |
6580 | } | |
51e29401 RS |
6581 | |
6582 | specparms = nreverse (specparms); | |
6583 | for (parm = specparms; parm; parm = next) | |
6584 | { | |
6585 | next = TREE_CHAIN (parm); | |
6586 | if (TREE_CODE (parm) == PARM_DECL) | |
6587 | { | |
6588 | if (DECL_NAME (parm) == 0) | |
6589 | error_with_decl (parm, "parameter name omitted"); | |
5fe86b8b | 6590 | else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node) |
a4faa7cc JW |
6591 | { |
6592 | error_with_decl (parm, "parameter `%s' declared void"); | |
6593 | /* Change the type to error_mark_node so this parameter | |
6594 | will be ignored by assign_parms. */ | |
6595 | TREE_TYPE (parm) = error_mark_node; | |
6596 | } | |
51e29401 RS |
6597 | pushdecl (parm); |
6598 | } | |
6599 | else | |
6600 | { | |
6601 | /* If we find an enum constant or a type tag, | |
6602 | put it aside for the moment. */ | |
6603 | TREE_CHAIN (parm) = 0; | |
6604 | others = chainon (others, parm); | |
6605 | } | |
6606 | } | |
6607 | ||
6608 | /* Get the decls in their original chain order | |
6609 | and record in the function. */ | |
6610 | DECL_ARGUMENTS (fndecl) = getdecls (); | |
6611 | ||
6612 | #if 0 | |
6613 | /* If this function takes a variable number of arguments, | |
6614 | add a phony parameter to the end of the parm list, | |
6615 | to represent the position of the first unnamed argument. */ | |
6616 | if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))) | |
6617 | != void_type_node) | |
6618 | { | |
6619 | tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node); | |
6620 | /* Let's hope the address of the unnamed parm | |
6621 | won't depend on its type. */ | |
6622 | TREE_TYPE (dummy) = integer_type_node; | |
6623 | DECL_ARG_TYPE (dummy) = integer_type_node; | |
6624 | DECL_ARGUMENTS (fndecl) | |
6625 | = chainon (DECL_ARGUMENTS (fndecl), dummy); | |
6626 | } | |
6627 | #endif | |
6628 | ||
6629 | /* Now pushdecl the enum constants. */ | |
6630 | for (parm = others; parm; parm = next) | |
6631 | { | |
6632 | next = TREE_CHAIN (parm); | |
6633 | if (DECL_NAME (parm) == 0) | |
6634 | ; | |
5fe86b8b | 6635 | else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node) |
51e29401 RS |
6636 | ; |
6637 | else if (TREE_CODE (parm) != PARM_DECL) | |
6638 | pushdecl (parm); | |
6639 | } | |
6640 | ||
6641 | storetags (chainon (parmtags, gettags ())); | |
6642 | } | |
6643 | else | |
6644 | { | |
6645 | /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes | |
6646 | each with a parm name as the TREE_VALUE. | |
6647 | ||
6648 | PARMDECLS is a chain of declarations for parameters. | |
6649 | Warning! It can also contain CONST_DECLs which are not parameters | |
6650 | but are names of enumerators of any enum types | |
6651 | declared among the parameters. | |
6652 | ||
6653 | First match each formal parameter name with its declaration. | |
6654 | Associate decls with the names and store the decls | |
6655 | into the TREE_PURPOSE slots. */ | |
6656 | ||
6657 | for (parm = parmdecls; parm; parm = TREE_CHAIN (parm)) | |
6658 | DECL_RESULT (parm) = 0; | |
6659 | ||
6660 | for (parm = specparms; parm; parm = TREE_CHAIN (parm)) | |
6661 | { | |
6662 | register tree tail, found = NULL; | |
6663 | ||
6664 | if (TREE_VALUE (parm) == 0) | |
6665 | { | |
6666 | error_with_decl (fndecl, "parameter name missing from parameter list"); | |
6667 | TREE_PURPOSE (parm) = 0; | |
6668 | continue; | |
6669 | } | |
6670 | ||
6671 | /* See if any of the parmdecls specifies this parm by name. | |
6672 | Ignore any enumerator decls. */ | |
6673 | for (tail = parmdecls; tail; tail = TREE_CHAIN (tail)) | |
6674 | if (DECL_NAME (tail) == TREE_VALUE (parm) | |
6675 | && TREE_CODE (tail) == PARM_DECL) | |
6676 | { | |
6677 | found = tail; | |
6678 | break; | |
6679 | } | |
6680 | ||
6681 | /* If declaration already marked, we have a duplicate name. | |
6682 | Complain, and don't use this decl twice. */ | |
6683 | if (found && DECL_RESULT (found) != 0) | |
6684 | { | |
6685 | error_with_decl (found, "multiple parameters named `%s'"); | |
6686 | found = 0; | |
6687 | } | |
6688 | ||
6689 | /* If the declaration says "void", complain and ignore it. */ | |
5fe86b8b | 6690 | if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node) |
51e29401 RS |
6691 | { |
6692 | error_with_decl (found, "parameter `%s' declared void"); | |
6693 | TREE_TYPE (found) = integer_type_node; | |
6694 | DECL_ARG_TYPE (found) = integer_type_node; | |
6695 | layout_decl (found, 0); | |
6696 | } | |
6697 | ||
6698 | /* Traditionally, a parm declared float is actually a double. */ | |
6699 | if (found && flag_traditional | |
90d56da8 | 6700 | && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node) |
6d142a10 RS |
6701 | { |
6702 | TREE_TYPE (found) = double_type_node; | |
6703 | DECL_ARG_TYPE (found) = double_type_node; | |
6704 | layout_decl (found, 0); | |
6705 | } | |
51e29401 RS |
6706 | |
6707 | /* If no declaration found, default to int. */ | |
6708 | if (!found) | |
6709 | { | |
6710 | found = build_decl (PARM_DECL, TREE_VALUE (parm), | |
6711 | integer_type_node); | |
6712 | DECL_ARG_TYPE (found) = TREE_TYPE (found); | |
6713 | DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl); | |
6714 | DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl); | |
6715 | if (extra_warnings) | |
6716 | warning_with_decl (found, "type of `%s' defaults to `int'"); | |
6717 | pushdecl (found); | |
6718 | } | |
6719 | ||
6720 | TREE_PURPOSE (parm) = found; | |
6721 | ||
6722 | /* Mark this decl as "already found" -- see test, above. | |
6723 | It is safe to use DECL_RESULT for this | |
6724 | since it is not used in PARM_DECLs or CONST_DECLs. */ | |
6725 | DECL_RESULT (found) = error_mark_node; | |
6726 | } | |
6727 | ||
6728 | /* Put anything which is on the parmdecls chain and which is | |
6729 | not a PARM_DECL onto the list NONPARMS. (The types of | |
6730 | non-parm things which might appear on the list include | |
6731 | enumerators and NULL-named TYPE_DECL nodes.) Complain about | |
6732 | any actual PARM_DECLs not matched with any names. */ | |
6733 | ||
6734 | nonparms = 0; | |
6735 | for (parm = parmdecls; parm; ) | |
6736 | { | |
6737 | tree next = TREE_CHAIN (parm); | |
6738 | TREE_CHAIN (parm) = 0; | |
6739 | ||
6740 | if (TREE_CODE (parm) != PARM_DECL) | |
6741 | nonparms = chainon (nonparms, parm); | |
6742 | else | |
6743 | { | |
6744 | /* Complain about args with incomplete types. */ | |
6745 | if (TYPE_SIZE (TREE_TYPE (parm)) == 0) | |
6746 | { | |
6747 | error_with_decl (parm, "parameter `%s' has incomplete type"); | |
6748 | TREE_TYPE (parm) = error_mark_node; | |
6749 | } | |
6750 | ||
6751 | if (DECL_RESULT (parm) == 0) | |
6752 | { | |
6753 | error_with_decl (parm, | |
6754 | "declaration for parameter `%s' but no such parameter"); | |
6755 | /* Pretend the parameter was not missing. | |
6756 | This gets us to a standard state and minimizes | |
6757 | further error messages. */ | |
6758 | specparms | |
6759 | = chainon (specparms, | |
6760 | tree_cons (parm, NULL_TREE, NULL_TREE)); | |
6761 | } | |
6762 | } | |
6763 | ||
6764 | parm = next; | |
6765 | } | |
6766 | ||
6767 | /* Chain the declarations together in the order of the list of names. */ | |
6768 | /* Store that chain in the function decl, replacing the list of names. */ | |
6769 | parm = specparms; | |
6770 | DECL_ARGUMENTS (fndecl) = 0; | |
6771 | { | |
6772 | register tree last; | |
6773 | for (last = 0; parm; parm = TREE_CHAIN (parm)) | |
6774 | if (TREE_PURPOSE (parm)) | |
6775 | { | |
6776 | if (last == 0) | |
6777 | DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm); | |
6778 | else | |
6779 | TREE_CHAIN (last) = TREE_PURPOSE (parm); | |
6780 | last = TREE_PURPOSE (parm); | |
6781 | TREE_CHAIN (last) = 0; | |
6782 | } | |
6783 | } | |
6784 | ||
6785 | /* If there was a previous prototype, | |
6786 | set the DECL_ARG_TYPE of each argument according to | |
6787 | the type previously specified, and report any mismatches. */ | |
6788 | ||
6789 | if (TYPE_ARG_TYPES (TREE_TYPE (fndecl))) | |
6790 | { | |
6791 | register tree type; | |
6792 | for (parm = DECL_ARGUMENTS (fndecl), | |
6793 | type = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); | |
5fe86b8b RS |
6794 | parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) |
6795 | != void_type_node)); | |
51e29401 RS |
6796 | parm = TREE_CHAIN (parm), type = TREE_CHAIN (type)) |
6797 | { | |
6798 | if (parm == 0 || type == 0 | |
5fe86b8b | 6799 | || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node) |
51e29401 RS |
6800 | { |
6801 | error ("number of arguments doesn't match prototype"); | |
50a9145c JW |
6802 | error_with_file_and_line (current_function_prototype_file, |
6803 | current_function_prototype_line, | |
6804 | "prototype declaration"); | |
51e29401 RS |
6805 | break; |
6806 | } | |
6807 | /* Type for passing arg must be consistent | |
6808 | with that declared for the arg. */ | |
ec2343c4 | 6809 | if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type))) |
51e29401 | 6810 | { |
b3fc0c98 RS |
6811 | if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) |
6812 | == TYPE_MAIN_VARIANT (TREE_VALUE (type))) | |
51e29401 | 6813 | { |
ec2343c4 MM |
6814 | /* Adjust argument to match prototype. E.g. a previous |
6815 | `int foo(float);' prototype causes | |
6816 | `int foo(x) float x; {...}' to be treated like | |
6817 | `int foo(float x) {...}'. This is particularly | |
6818 | useful for argument types like uid_t. */ | |
6819 | DECL_ARG_TYPE (parm) = TREE_TYPE (parm); | |
6820 | #ifdef PROMOTE_PROTOTYPES | |
fd48df3e RK |
6821 | if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE |
6822 | || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE) | |
ec2343c4 MM |
6823 | && TYPE_PRECISION (TREE_TYPE (parm)) |
6824 | < TYPE_PRECISION (integer_type_node)) | |
6825 | DECL_ARG_TYPE (parm) = integer_type_node; | |
6826 | #endif | |
6827 | if (pedantic) | |
50a9145c | 6828 | { |
42f00318 | 6829 | pedwarn ("promoted argument `%s' doesn't match prototype", |
50a9145c JW |
6830 | IDENTIFIER_POINTER (DECL_NAME (parm))); |
6831 | warning_with_file_and_line | |
6832 | (current_function_prototype_file, | |
6833 | current_function_prototype_line, | |
6834 | "prototype declaration"); | |
6835 | } | |
51e29401 | 6836 | } |
ec2343c4 MM |
6837 | /* If -traditional, allow `int' argument to match |
6838 | `unsigned' prototype. */ | |
6839 | else if (! (flag_traditional | |
90d56da8 RS |
6840 | && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node |
6841 | && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)) | |
50a9145c JW |
6842 | { |
6843 | error ("argument `%s' doesn't match prototype", | |
6844 | IDENTIFIER_POINTER (DECL_NAME (parm))); | |
6845 | error_with_file_and_line (current_function_prototype_file, | |
6846 | current_function_prototype_line, | |
6847 | "prototype declaration"); | |
6848 | } | |
51e29401 RS |
6849 | } |
6850 | } | |
6851 | TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0; | |
6852 | } | |
6853 | ||
6854 | /* Otherwise, create a prototype that would match. */ | |
6855 | ||
6856 | else | |
6857 | { | |
b8e605ab | 6858 | tree actual = 0, last = 0, type; |
51e29401 RS |
6859 | |
6860 | for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm)) | |
6861 | { | |
8d9bfdc5 RK |
6862 | type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), |
6863 | NULL_TREE); | |
51e29401 RS |
6864 | if (last) |
6865 | TREE_CHAIN (last) = type; | |
6866 | else | |
6867 | actual = type; | |
6868 | last = type; | |
6869 | } | |
8d9bfdc5 | 6870 | type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE); |
51e29401 RS |
6871 | if (last) |
6872 | TREE_CHAIN (last) = type; | |
6873 | else | |
6874 | actual = type; | |
6875 | ||
c138f328 RS |
6876 | /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES |
6877 | of the type of this function, but we need to avoid having this | |
6878 | affect the types of other similarly-typed functions, so we must | |
6879 | first force the generation of an identical (but separate) type | |
6880 | node for the relevant function type. The new node we create | |
6881 | will be a variant of the main variant of the original function | |
6882 | type. */ | |
6883 | ||
929f3671 | 6884 | TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl)); |
c138f328 | 6885 | |
51e29401 RS |
6886 | TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual; |
6887 | } | |
6888 | ||
6889 | /* Now store the final chain of decls for the arguments | |
6890 | as the decl-chain of the current lexical scope. | |
6891 | Put the enumerators in as well, at the front so that | |
6892 | DECL_ARGUMENTS is not modified. */ | |
6893 | ||
6894 | storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl))); | |
6895 | } | |
6896 | ||
6897 | /* Make sure the binding level for the top of the function body | |
6898 | gets a BLOCK if there are any in the function. | |
6899 | Otherwise, the dbx output is wrong. */ | |
6900 | ||
6901 | keep_next_if_subblocks = 1; | |
6902 | ||
6903 | /* ??? This might be an improvement, | |
6904 | but needs to be thought about some more. */ | |
6905 | #if 0 | |
6906 | keep_next_level_flag = 1; | |
6907 | #endif | |
6908 | ||
6909 | /* Write a record describing this function definition to the prototypes | |
6910 | file (if requested). */ | |
6911 | ||
6912 | gen_aux_info_record (fndecl, 1, 0, prototype); | |
6913 | ||
6914 | /* Initialize the RTL code for the function. */ | |
6915 | ||
6916 | init_function_start (fndecl, input_filename, lineno); | |
6917 | ||
6918 | /* If this is a varargs function, inform function.c. */ | |
6919 | ||
6920 | if (c_function_varargs) | |
6921 | mark_varargs (); | |
6922 | ||
b032c74c | 6923 | /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */ |
7da551a2 RS |
6924 | |
6925 | declare_function_name (); | |
93e3ba4f | 6926 | |
51e29401 RS |
6927 | /* Set up parameters and prepare for return, for the function. */ |
6928 | ||
6929 | expand_function_start (fndecl, 0); | |
6930 | ||
6931 | /* If this function is `main', emit a call to `__main' | |
6932 | to run global initializers, etc. */ | |
6933 | if (DECL_NAME (fndecl) | |
6934 | && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0 | |
6935 | && DECL_CONTEXT (fndecl) == NULL_TREE) | |
6936 | expand_main_function (); | |
6937 | } | |
6938 | \f | |
6939 | /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes | |
6940 | each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE | |
6941 | stands for an ellipsis in the identifier list. | |
6942 | ||
6943 | PARMLIST is the data returned by get_parm_info for the | |
6944 | parmlist that follows the semicolon. | |
6945 | ||
6946 | We return a value of the same sort that get_parm_info returns, | |
6947 | except that it describes the combination of identifiers and parmlist. */ | |
6948 | ||
6949 | tree | |
6950 | combine_parm_decls (specparms, parmlist, void_at_end) | |
6951 | tree specparms, parmlist; | |
6952 | int void_at_end; | |
6953 | { | |
6954 | register tree fndecl = current_function_decl; | |
6955 | register tree parm; | |
6956 | ||
6957 | tree parmdecls = TREE_PURPOSE (parmlist); | |
6958 | ||
6959 | /* This is a chain of any other decls that came in among the parm | |
6960 | declarations. They were separated already by get_parm_info, | |
6961 | so we just need to keep them separate. */ | |
6962 | tree nonparms = TREE_VALUE (parmlist); | |
6963 | ||
6964 | tree types = 0; | |
6965 | ||
6966 | for (parm = parmdecls; parm; parm = TREE_CHAIN (parm)) | |
6967 | DECL_RESULT (parm) = 0; | |
6968 | ||
6969 | for (parm = specparms; parm; parm = TREE_CHAIN (parm)) | |
6970 | { | |
6971 | register tree tail, found = NULL; | |
6972 | ||
6973 | /* See if any of the parmdecls specifies this parm by name. */ | |
6974 | for (tail = parmdecls; tail; tail = TREE_CHAIN (tail)) | |
6975 | if (DECL_NAME (tail) == TREE_VALUE (parm)) | |
6976 | { | |
6977 | found = tail; | |
6978 | break; | |
6979 | } | |
6980 | ||
6981 | /* If declaration already marked, we have a duplicate name. | |
6982 | Complain, and don't use this decl twice. */ | |
6983 | if (found && DECL_RESULT (found) != 0) | |
6984 | { | |
6985 | error_with_decl (found, "multiple parameters named `%s'"); | |
6986 | found = 0; | |
6987 | } | |
6988 | ||
6989 | /* If the declaration says "void", complain and ignore it. */ | |
5fe86b8b | 6990 | if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node) |
51e29401 RS |
6991 | { |
6992 | error_with_decl (found, "parameter `%s' declared void"); | |
6993 | TREE_TYPE (found) = integer_type_node; | |
6994 | DECL_ARG_TYPE (found) = integer_type_node; | |
6995 | layout_decl (found, 0); | |
6996 | } | |
6997 | ||
6998 | /* Traditionally, a parm declared float is actually a double. */ | |
6999 | if (found && flag_traditional | |
90d56da8 | 7000 | && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node) |
6d142a10 RS |
7001 | { |
7002 | TREE_TYPE (found) = double_type_node; | |
7003 | DECL_ARG_TYPE (found) = double_type_node; | |
7004 | layout_decl (found, 0); | |
7005 | } | |
51e29401 RS |
7006 | |
7007 | /* If no declaration found, default to int. */ | |
7008 | if (!found) | |
7009 | { | |
7010 | found = build_decl (PARM_DECL, TREE_VALUE (parm), | |
7011 | integer_type_node); | |
7012 | DECL_ARG_TYPE (found) = TREE_TYPE (found); | |
7013 | DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl); | |
7014 | DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl); | |
6b2a374b | 7015 | error_with_decl (found, "type of parameter `%s' is not declared"); |
51e29401 RS |
7016 | pushdecl (found); |
7017 | } | |
7018 | ||
7019 | TREE_PURPOSE (parm) = found; | |
7020 | ||
7021 | /* Mark this decl as "already found" -- see test, above. | |
7022 | It is safe to use DECL_RESULT for this | |
7023 | since it is not used in PARM_DECLs or CONST_DECLs. */ | |
7024 | DECL_RESULT (found) = error_mark_node; | |
7025 | } | |
7026 | ||
7027 | /* Complain about any actual PARM_DECLs not matched with any names. */ | |
7028 | ||
7029 | for (parm = parmdecls; parm; ) | |
7030 | { | |
7031 | tree next = TREE_CHAIN (parm); | |
7032 | TREE_CHAIN (parm) = 0; | |
7033 | ||
7034 | /* Complain about args with incomplete types. */ | |
7035 | if (TYPE_SIZE (TREE_TYPE (parm)) == 0) | |
7036 | { | |
7037 | error_with_decl (parm, "parameter `%s' has incomplete type"); | |
7038 | TREE_TYPE (parm) = error_mark_node; | |
7039 | } | |
7040 | ||
7041 | if (DECL_RESULT (parm) == 0) | |
7042 | { | |
7043 | error_with_decl (parm, | |
7044 | "declaration for parameter `%s' but no such parameter"); | |
7045 | /* Pretend the parameter was not missing. | |
7046 | This gets us to a standard state and minimizes | |
7047 | further error messages. */ | |
7048 | specparms | |
7049 | = chainon (specparms, | |
7050 | tree_cons (parm, NULL_TREE, NULL_TREE)); | |
7051 | } | |
7052 | ||
7053 | parm = next; | |
7054 | } | |
7055 | ||
7056 | /* Chain the declarations together in the order of the list of names. | |
7057 | At the same time, build up a list of their types, in reverse order. */ | |
7058 | ||
7059 | parm = specparms; | |
7060 | parmdecls = 0; | |
7061 | { | |
7062 | register tree last; | |
7063 | for (last = 0; parm; parm = TREE_CHAIN (parm)) | |
7064 | if (TREE_PURPOSE (parm)) | |
7065 | { | |
7066 | if (last == 0) | |
7067 | parmdecls = TREE_PURPOSE (parm); | |
7068 | else | |
7069 | TREE_CHAIN (last) = TREE_PURPOSE (parm); | |
7070 | last = TREE_PURPOSE (parm); | |
7071 | TREE_CHAIN (last) = 0; | |
7072 | ||
7073 | types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types); | |
7074 | } | |
7075 | } | |
7076 | ||
7077 | if (void_at_end) | |
7078 | return saveable_tree_cons (parmdecls, nonparms, | |
b423779d RK |
7079 | nreverse (saveable_tree_cons (NULL_TREE, |
7080 | void_type_node, | |
7081 | types))); | |
51e29401 RS |
7082 | |
7083 | return saveable_tree_cons (parmdecls, nonparms, nreverse (types)); | |
7084 | } | |
7085 | \f | |
7086 | /* Finish up a function declaration and compile that function | |
7087 | all the way to assembler language output. The free the storage | |
7088 | for the function definition. | |
7089 | ||
7090 | This is called after parsing the body of the function definition. | |
7091 | ||
7092 | NESTED is nonzero if the function being finished is nested in another. */ | |
7093 | ||
7094 | void | |
7095 | finish_function (nested) | |
7096 | int nested; | |
7097 | { | |
7098 | register tree fndecl = current_function_decl; | |
7099 | ||
7100 | /* TREE_READONLY (fndecl) = 1; | |
7101 | This caused &foo to be of type ptr-to-const-function | |
7102 | which then got a warning when stored in a ptr-to-function variable. */ | |
7103 | ||
7104 | poplevel (1, 0, 1); | |
960a2eb1 | 7105 | BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl; |
51e29401 RS |
7106 | |
7107 | /* Must mark the RESULT_DECL as being in this function. */ | |
7108 | ||
7109 | DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl; | |
7110 | ||
7111 | /* Obey `register' declarations if `setjmp' is called in this fn. */ | |
7112 | if (flag_traditional && current_function_calls_setjmp) | |
7113 | { | |
7114 | setjmp_protect (DECL_INITIAL (fndecl)); | |
7115 | setjmp_protect_args (); | |
7116 | } | |
7117 | ||
51e29401 RS |
7118 | if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main")) |
7119 | { | |
90d56da8 RS |
7120 | if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) |
7121 | != integer_type_node) | |
b8705e61 RK |
7122 | { |
7123 | /* You would expect the sense of this test to be the other way | |
7124 | around, but if warn_main is set, we will already have warned, | |
7125 | so this would be a duplicate. This is the warning you get | |
7126 | in some environments even if you *don't* ask for it, because | |
7127 | these are environments where it may be more of a problem than | |
7128 | usual. */ | |
7129 | if (! warn_main) | |
7130 | pedwarn_with_decl (fndecl, "return type of `%s' is not `int'"); | |
7131 | } | |
8e077183 RS |
7132 | else |
7133 | { | |
cd4aafd5 | 7134 | #ifdef DEFAULT_MAIN_RETURN |
8e077183 RS |
7135 | /* Make it so that `main' always returns success by default. */ |
7136 | DEFAULT_MAIN_RETURN; | |
cd4aafd5 | 7137 | #endif |
8e077183 | 7138 | } |
51e29401 | 7139 | } |
51e29401 RS |
7140 | |
7141 | /* Generate rtl for function exit. */ | |
0e5eedfe | 7142 | expand_function_end (input_filename, lineno, 0); |
51e29401 RS |
7143 | |
7144 | /* So we can tell if jump_optimize sets it to 1. */ | |
7145 | can_reach_end = 0; | |
7146 | ||
7147 | /* Run the optimizers and output the assembler code for this function. */ | |
7148 | rest_of_compilation (fndecl); | |
7149 | ||
7150 | current_function_returns_null |= can_reach_end; | |
7151 | ||
7152 | if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null) | |
11433f42 | 7153 | warning ("`noreturn' function does return"); |
42dfa47f | 7154 | else if (warn_return_type && can_reach_end |
51e29401 RS |
7155 | && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node) |
7156 | /* If this function returns non-void and control can drop through, | |
7157 | complain. */ | |
7158 | warning ("control reaches end of non-void function"); | |
7159 | /* With just -W, complain only if function returns both with | |
7160 | and without a value. */ | |
7161 | else if (extra_warnings | |
7162 | && current_function_returns_value && current_function_returns_null) | |
7163 | warning ("this function may return with or without a value"); | |
7164 | ||
739d15ab RK |
7165 | /* If requested, warn about function definitions where the function will |
7166 | return a value (usually of some struct or union type) which itself will | |
7167 | take up a lot of stack space. */ | |
7168 | ||
7169 | if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl)) | |
7170 | { | |
7171 | register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl)); | |
7172 | ||
7173 | if (ret_type) | |
7174 | { | |
7175 | register tree ret_type_size = TYPE_SIZE (ret_type); | |
7176 | ||
7177 | if (TREE_CODE (ret_type_size) == INTEGER_CST) | |
7178 | { | |
7179 | unsigned units | |
7180 | = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT; | |
7181 | ||
7182 | if (units > larger_than_size) | |
7183 | warning_with_decl (fndecl, | |
7184 | "size of return value of `%s' is %u bytes", | |
7185 | units); | |
7186 | } | |
7187 | } | |
7188 | } | |
7189 | ||
51e29401 RS |
7190 | /* Free all the tree nodes making up this function. */ |
7191 | /* Switch back to allocating nodes permanently | |
7192 | until we start another function. */ | |
7193 | if (! nested) | |
3e755d23 | 7194 | permanent_allocation (1); |
51e29401 RS |
7195 | |
7196 | if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested) | |
7197 | { | |
7198 | /* Stop pointing to the local nodes about to be freed. */ | |
7199 | /* But DECL_INITIAL must remain nonzero so we know this | |
7200 | was an actual function definition. */ | |
7201 | /* For a nested function, this is done in pop_c_function_context. */ | |
708e813b RS |
7202 | /* If rest_of_compilation set this to 0, leave it 0. */ |
7203 | if (DECL_INITIAL (fndecl) != 0) | |
7204 | DECL_INITIAL (fndecl) = error_mark_node; | |
51e29401 RS |
7205 | DECL_ARGUMENTS (fndecl) = 0; |
7206 | } | |
7207 | ||
2c5f4139 JM |
7208 | if (DECL_STATIC_CONSTRUCTOR (fndecl)) |
7209 | { | |
7210 | #ifndef ASM_OUTPUT_CONSTRUCTOR | |
7211 | if (! flag_gnu_linker) | |
7212 | static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors); | |
7213 | else | |
7214 | #endif | |
7215 | assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl))); | |
7216 | } | |
7217 | if (DECL_STATIC_DESTRUCTOR (fndecl)) | |
7218 | { | |
7219 | #ifndef ASM_OUTPUT_DESTRUCTOR | |
7220 | if (! flag_gnu_linker) | |
7221 | static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors); | |
7222 | else | |
7223 | #endif | |
7224 | assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl))); | |
7225 | } | |
7226 | ||
51e29401 RS |
7227 | if (! nested) |
7228 | { | |
7229 | /* Let the error reporting routines know that we're outside a | |
7230 | function. For a nested function, this value is used in | |
7231 | pop_c_function_context and then reset via pop_function_context. */ | |
7232 | current_function_decl = NULL; | |
7233 | } | |
7234 | } | |
7235 | \f | |
7236 | /* Save and restore the variables in this file and elsewhere | |
7237 | that keep track of the progress of compilation of the current function. | |
7238 | Used for nested functions. */ | |
7239 | ||
7240 | struct c_function | |
7241 | { | |
7242 | struct c_function *next; | |
51e29401 RS |
7243 | tree named_labels; |
7244 | tree shadowed_labels; | |
7245 | int returns_value; | |
7246 | int returns_null; | |
7247 | int warn_about_return_type; | |
7248 | int extern_inline; | |
7249 | struct binding_level *binding_level; | |
7250 | }; | |
7251 | ||
7252 | struct c_function *c_function_chain; | |
7253 | ||
7254 | /* Save and reinitialize the variables | |
7255 | used during compilation of a C function. */ | |
7256 | ||
7257 | void | |
7258 | push_c_function_context () | |
7259 | { | |
7260 | struct c_function *p | |
7261 | = (struct c_function *) xmalloc (sizeof (struct c_function)); | |
7262 | ||
ec2343c4 MM |
7263 | if (pedantic) |
7264 | pedwarn ("ANSI C forbids nested functions"); | |
7265 | ||
51e29401 RS |
7266 | push_function_context (); |
7267 | ||
7268 | p->next = c_function_chain; | |
7269 | c_function_chain = p; | |
7270 | ||
51e29401 RS |
7271 | p->named_labels = named_labels; |
7272 | p->shadowed_labels = shadowed_labels; | |
7273 | p->returns_value = current_function_returns_value; | |
7274 | p->returns_null = current_function_returns_null; | |
7275 | p->warn_about_return_type = warn_about_return_type; | |
7276 | p->extern_inline = current_extern_inline; | |
7277 | p->binding_level = current_binding_level; | |
7278 | } | |
7279 | ||
7280 | /* Restore the variables used during compilation of a C function. */ | |
7281 | ||
7282 | void | |
7283 | pop_c_function_context () | |
7284 | { | |
7285 | struct c_function *p = c_function_chain; | |
7286 | tree link; | |
7287 | ||
7288 | /* Bring back all the labels that were shadowed. */ | |
7289 | for (link = shadowed_labels; link; link = TREE_CHAIN (link)) | |
7290 | if (DECL_NAME (TREE_VALUE (link)) != 0) | |
7291 | IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) | |
7292 | = TREE_VALUE (link); | |
7293 | ||
7294 | if (DECL_SAVED_INSNS (current_function_decl) == 0) | |
7295 | { | |
7296 | /* Stop pointing to the local nodes about to be freed. */ | |
7297 | /* But DECL_INITIAL must remain nonzero so we know this | |
7298 | was an actual function definition. */ | |
7299 | DECL_INITIAL (current_function_decl) = error_mark_node; | |
7300 | DECL_ARGUMENTS (current_function_decl) = 0; | |
7301 | } | |
7302 | ||
7303 | pop_function_context (); | |
7304 | ||
7305 | c_function_chain = p->next; | |
7306 | ||
51e29401 RS |
7307 | named_labels = p->named_labels; |
7308 | shadowed_labels = p->shadowed_labels; | |
7309 | current_function_returns_value = p->returns_value; | |
7310 | current_function_returns_null = p->returns_null; | |
7311 | warn_about_return_type = p->warn_about_return_type; | |
7312 | current_extern_inline = p->extern_inline; | |
7313 | current_binding_level = p->binding_level; | |
7314 | ||
7315 | free (p); | |
7316 | } | |
37105beb JM |
7317 | |
7318 | /* integrate_decl_tree calls this function, but since we don't use the | |
7319 | DECL_LANG_SPECIFIC field, this is a no-op. */ | |
7320 | ||
7321 | void | |
7322 | copy_lang_decl (node) | |
d6f4ec51 | 7323 | tree node ATTRIBUTE_UNUSED; |
37105beb JM |
7324 | { |
7325 | } |