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51e29401 | 1 | /* Process declarations and variables for C compiler. |
a34731a6 | 2 | Copyright (C) 1988, 1992, 1993 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 | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | ||
21 | /* Process declarations and symbol lookup for C front end. | |
22 | Also constructs types; the standard scalar types at initialization, | |
23 | and structure, union, array and enum types when they are declared. */ | |
24 | ||
25 | /* ??? not all decl nodes are given the most useful possible | |
26 | line numbers. For example, the CONST_DECLs for enum values. */ | |
27 | ||
28 | #include "config.h" | |
29 | #include "tree.h" | |
30 | #include "flags.h" | |
31 | #include "c-tree.h" | |
32 | #include "c-lex.h" | |
33 | #include <stdio.h> | |
34 | ||
35 | /* In grokdeclarator, distinguish syntactic contexts of declarators. */ | |
36 | enum decl_context | |
37 | { NORMAL, /* Ordinary declaration */ | |
38 | FUNCDEF, /* Function definition */ | |
39 | PARM, /* Declaration of parm before function body */ | |
40 | FIELD, /* Declaration inside struct or union */ | |
41 | BITFIELD, /* Likewise but with specified width */ | |
42 | TYPENAME}; /* Typename (inside cast or sizeof) */ | |
43 | ||
51e29401 RS |
44 | #ifndef CHAR_TYPE_SIZE |
45 | #define CHAR_TYPE_SIZE BITS_PER_UNIT | |
46 | #endif | |
47 | ||
48 | #ifndef SHORT_TYPE_SIZE | |
49 | #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2)) | |
50 | #endif | |
51 | ||
52 | #ifndef INT_TYPE_SIZE | |
53 | #define INT_TYPE_SIZE BITS_PER_WORD | |
54 | #endif | |
55 | ||
56 | #ifndef LONG_TYPE_SIZE | |
57 | #define LONG_TYPE_SIZE BITS_PER_WORD | |
58 | #endif | |
59 | ||
60 | #ifndef LONG_LONG_TYPE_SIZE | |
61 | #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2) | |
62 | #endif | |
63 | ||
64 | #ifndef WCHAR_UNSIGNED | |
65 | #define WCHAR_UNSIGNED 0 | |
66 | #endif | |
67 | ||
68 | #ifndef FLOAT_TYPE_SIZE | |
69 | #define FLOAT_TYPE_SIZE BITS_PER_WORD | |
70 | #endif | |
71 | ||
72 | #ifndef DOUBLE_TYPE_SIZE | |
73 | #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2) | |
74 | #endif | |
75 | ||
76 | #ifndef LONG_DOUBLE_TYPE_SIZE | |
77 | #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2) | |
78 | #endif | |
79 | ||
80 | /* We let tm.h override the types used here, to handle trivial differences | |
81 | such as the choice of unsigned int or long unsigned int for size_t. | |
82 | When machines start needing nontrivial differences in the size type, | |
83 | it would be best to do something here to figure out automatically | |
84 | from other information what type to use. */ | |
85 | ||
86 | #ifndef SIZE_TYPE | |
87 | #define SIZE_TYPE "long unsigned int" | |
88 | #endif | |
89 | ||
90 | #ifndef PTRDIFF_TYPE | |
91 | #define PTRDIFF_TYPE "long int" | |
92 | #endif | |
93 | ||
94 | #ifndef WCHAR_TYPE | |
95 | #define WCHAR_TYPE "int" | |
96 | #endif | |
97 | \f | |
98 | /* a node which has tree code ERROR_MARK, and whose type is itself. | |
99 | All erroneous expressions are replaced with this node. All functions | |
100 | that accept nodes as arguments should avoid generating error messages | |
101 | if this node is one of the arguments, since it is undesirable to get | |
102 | multiple error messages from one error in the input. */ | |
103 | ||
104 | tree error_mark_node; | |
105 | ||
106 | /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */ | |
107 | ||
108 | tree short_integer_type_node; | |
109 | tree integer_type_node; | |
110 | tree long_integer_type_node; | |
111 | tree long_long_integer_type_node; | |
112 | ||
113 | tree short_unsigned_type_node; | |
114 | tree unsigned_type_node; | |
115 | tree long_unsigned_type_node; | |
116 | tree long_long_unsigned_type_node; | |
117 | ||
118 | tree ptrdiff_type_node; | |
119 | ||
120 | tree unsigned_char_type_node; | |
121 | tree signed_char_type_node; | |
122 | tree char_type_node; | |
123 | tree wchar_type_node; | |
124 | tree signed_wchar_type_node; | |
125 | tree unsigned_wchar_type_node; | |
126 | ||
127 | tree float_type_node; | |
128 | tree double_type_node; | |
129 | tree long_double_type_node; | |
130 | ||
5ab10c42 RS |
131 | tree complex_integer_type_node; |
132 | tree complex_float_type_node; | |
133 | tree complex_double_type_node; | |
134 | tree complex_long_double_type_node; | |
135 | ||
ac4f24e7 RS |
136 | tree intQI_type_node; |
137 | tree intHI_type_node; | |
138 | tree intSI_type_node; | |
139 | tree intDI_type_node; | |
140 | ||
141 | tree unsigned_intQI_type_node; | |
142 | tree unsigned_intHI_type_node; | |
143 | tree unsigned_intSI_type_node; | |
144 | tree unsigned_intDI_type_node; | |
145 | ||
51e29401 RS |
146 | /* a VOID_TYPE node. */ |
147 | ||
148 | tree void_type_node; | |
149 | ||
150 | /* Nodes for types `void *' and `const void *'. */ | |
151 | ||
152 | tree ptr_type_node, const_ptr_type_node; | |
153 | ||
154 | /* Nodes for types `char *' and `const char *'. */ | |
155 | ||
156 | tree string_type_node, const_string_type_node; | |
157 | ||
fba9adc6 | 158 | /* Type `char[SOMENUMBER]'. |
51e29401 RS |
159 | Used when an array of char is needed and the size is irrelevant. */ |
160 | ||
161 | tree char_array_type_node; | |
162 | ||
fba9adc6 | 163 | /* Type `int[SOMENUMBER]' or something like it. |
51e29401 RS |
164 | Used when an array of int needed and the size is irrelevant. */ |
165 | ||
166 | tree int_array_type_node; | |
167 | ||
fba9adc6 | 168 | /* Type `wchar_t[SOMENUMBER]' or something like it. |
51e29401 RS |
169 | Used when a wide string literal is created. */ |
170 | ||
171 | tree wchar_array_type_node; | |
172 | ||
173 | /* type `int ()' -- used for implicit declaration of functions. */ | |
174 | ||
175 | tree default_function_type; | |
176 | ||
177 | /* function types `double (double)' and `double (double, double)', etc. */ | |
178 | ||
179 | tree double_ftype_double, double_ftype_double_double; | |
180 | tree int_ftype_int, long_ftype_long; | |
181 | ||
182 | /* Function type `void (void *, void *, int)' and similar ones */ | |
183 | ||
184 | tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int; | |
185 | ||
186 | /* Function type `char *(char *, char *)' and similar ones */ | |
187 | tree string_ftype_ptr_ptr, int_ftype_string_string; | |
188 | ||
51e29401 RS |
189 | /* Function type `int (const void *, const void *, size_t)' */ |
190 | tree int_ftype_cptr_cptr_sizet; | |
191 | ||
192 | /* Two expressions that are constants with value zero. | |
193 | The first is of type `int', the second of type `void *'. */ | |
194 | ||
195 | tree integer_zero_node; | |
196 | tree null_pointer_node; | |
197 | ||
198 | /* A node for the integer constant 1. */ | |
199 | ||
200 | tree integer_one_node; | |
201 | ||
202 | /* Nonzero if we have seen an invalid cross reference | |
203 | to a struct, union, or enum, but not yet printed the message. */ | |
204 | ||
205 | tree pending_invalid_xref; | |
206 | /* File and line to appear in the eventual error message. */ | |
207 | char *pending_invalid_xref_file; | |
208 | int pending_invalid_xref_line; | |
209 | ||
210 | /* While defining an enum type, this is 1 plus the last enumerator | |
211 | constant value. */ | |
212 | ||
213 | static tree enum_next_value; | |
214 | ||
93e3ba4f RS |
215 | /* Nonzero means that there was overflow computing enum_next_value. */ |
216 | ||
217 | static int enum_overflow; | |
218 | ||
51e29401 RS |
219 | /* Parsing a function declarator leaves a list of parameter names |
220 | or a chain or parameter decls here. */ | |
221 | ||
222 | static tree last_function_parms; | |
223 | ||
224 | /* Parsing a function declarator leaves here a chain of structure | |
225 | and enum types declared in the parmlist. */ | |
226 | ||
227 | static tree last_function_parm_tags; | |
228 | ||
229 | /* After parsing the declarator that starts a function definition, | |
230 | `start_function' puts here the list of parameter names or chain of decls. | |
231 | `store_parm_decls' finds it here. */ | |
232 | ||
233 | static tree current_function_parms; | |
234 | ||
235 | /* Similar, for last_function_parm_tags. */ | |
236 | static tree current_function_parm_tags; | |
237 | ||
50a9145c JW |
238 | /* Similar, for the file and line that the prototype came from if this is |
239 | an old-style definition. */ | |
240 | static char *current_function_prototype_file; | |
241 | static int current_function_prototype_line; | |
242 | ||
51e29401 RS |
243 | /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function |
244 | that have names. Here so we can clear out their names' definitions | |
245 | at the end of the function. */ | |
246 | ||
c9c30903 | 247 | static tree named_labels; |
51e29401 RS |
248 | |
249 | /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */ | |
250 | ||
251 | static tree shadowed_labels; | |
252 | ||
253 | /* Nonzero when store_parm_decls is called indicates a varargs function. | |
254 | Value not meaningful after store_parm_decls. */ | |
255 | ||
256 | static int c_function_varargs; | |
257 | ||
258 | /* The FUNCTION_DECL for the function currently being compiled, | |
259 | or 0 if between functions. */ | |
260 | tree current_function_decl; | |
261 | ||
262 | /* Set to 0 at beginning of a function definition, set to 1 if | |
263 | a return statement that specifies a return value is seen. */ | |
264 | ||
265 | int current_function_returns_value; | |
266 | ||
267 | /* Set to 0 at beginning of a function definition, set to 1 if | |
268 | a return statement with no argument is seen. */ | |
269 | ||
270 | int current_function_returns_null; | |
271 | ||
272 | /* Set to nonzero by `grokdeclarator' for a function | |
273 | whose return type is defaulted, if warnings for this are desired. */ | |
274 | ||
275 | static int warn_about_return_type; | |
276 | ||
929f3671 | 277 | /* Nonzero when starting a function declared `extern inline'. */ |
51e29401 RS |
278 | |
279 | static int current_extern_inline; | |
280 | \f | |
281 | /* For each binding contour we allocate a binding_level structure | |
282 | * which records the names defined in that contour. | |
283 | * Contours include: | |
284 | * 0) the global one | |
285 | * 1) one for each function definition, | |
286 | * where internal declarations of the parameters appear. | |
287 | * 2) one for each compound statement, | |
288 | * to record its declarations. | |
289 | * | |
290 | * The current meaning of a name can be found by searching the levels from | |
291 | * the current one out to the global one. | |
292 | */ | |
293 | ||
294 | /* Note that the information in the `names' component of the global contour | |
295 | is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */ | |
296 | ||
297 | struct binding_level | |
298 | { | |
299 | /* A chain of _DECL nodes for all variables, constants, functions, | |
300 | and typedef types. These are in the reverse of the order supplied. | |
301 | */ | |
302 | tree names; | |
303 | ||
304 | /* A list of structure, union and enum definitions, | |
305 | * for looking up tag names. | |
306 | * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name, | |
307 | * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE, | |
308 | * or ENUMERAL_TYPE node. | |
309 | */ | |
310 | tree tags; | |
311 | ||
312 | /* For each level, a list of shadowed outer-level local definitions | |
313 | to be restored when this level is popped. | |
314 | Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and | |
315 | whose TREE_VALUE is its old definition (a kind of ..._DECL node). */ | |
316 | tree shadowed; | |
317 | ||
318 | /* For each level (except not the global one), | |
319 | a chain of BLOCK nodes for all the levels | |
320 | that were entered and exited one level down. */ | |
321 | tree blocks; | |
322 | ||
3bf40d18 RS |
323 | /* The BLOCK node for this level, if one has been preallocated. |
324 | If 0, the BLOCK is allocated (if needed) when the level is popped. */ | |
325 | tree this_block; | |
326 | ||
51e29401 RS |
327 | /* The binding level which this one is contained in (inherits from). */ |
328 | struct binding_level *level_chain; | |
329 | ||
330 | /* Nonzero for the level that holds the parameters of a function. */ | |
51e29401 RS |
331 | char parm_flag; |
332 | ||
333 | /* Nonzero if this level "doesn't exist" for tags. */ | |
334 | char tag_transparent; | |
335 | ||
336 | /* Nonzero if sublevels of this level "don't exist" for tags. | |
337 | This is set in the parm level of a function definition | |
338 | while reading the function body, so that the outermost block | |
339 | of the function body will be tag-transparent. */ | |
340 | char subblocks_tag_transparent; | |
341 | ||
342 | /* Nonzero means make a BLOCK for this level regardless of all else. */ | |
343 | char keep; | |
344 | ||
345 | /* Nonzero means make a BLOCK if this level has any subblocks. */ | |
346 | char keep_if_subblocks; | |
347 | ||
348 | /* Number of decls in `names' that have incomplete | |
349 | structure or union types. */ | |
350 | int n_incomplete; | |
351 | ||
352 | /* A list of decls giving the (reversed) specified order of parms, | |
353 | not including any forward-decls in the parmlist. | |
354 | This is so we can put the parms in proper order for assign_parms. */ | |
355 | tree parm_order; | |
356 | }; | |
357 | ||
358 | #define NULL_BINDING_LEVEL (struct binding_level *) NULL | |
359 | ||
360 | /* The binding level currently in effect. */ | |
361 | ||
362 | static struct binding_level *current_binding_level; | |
363 | ||
364 | /* A chain of binding_level structures awaiting reuse. */ | |
365 | ||
366 | static struct binding_level *free_binding_level; | |
367 | ||
368 | /* The outermost binding level, for names of file scope. | |
369 | This is created when the compiler is started and exists | |
370 | through the entire run. */ | |
371 | ||
372 | static struct binding_level *global_binding_level; | |
373 | ||
374 | /* Binding level structures are initialized by copying this one. */ | |
375 | ||
376 | static struct binding_level clear_binding_level | |
3bf40d18 | 377 | = {NULL, NULL, NULL, NULL, NULL, NULL, 0, 0, 0}; |
51e29401 RS |
378 | |
379 | /* Nonzero means unconditionally make a BLOCK for the next level pushed. */ | |
380 | ||
381 | static int keep_next_level_flag; | |
382 | ||
383 | /* Nonzero means make a BLOCK for the next level pushed | |
384 | if it has subblocks. */ | |
385 | ||
386 | static int keep_next_if_subblocks; | |
387 | ||
388 | /* The chain of outer levels of label scopes. | |
389 | This uses the same data structure used for binding levels, | |
390 | but it works differently: each link in the chain records | |
391 | saved values of named_labels and shadowed_labels for | |
392 | a label binding level outside the current one. */ | |
393 | ||
394 | static struct binding_level *label_level_chain; | |
395 | ||
396 | /* Forward declarations. */ | |
397 | ||
398 | static tree grokparms (), grokdeclarator (); | |
399 | tree pushdecl (); | |
929f3671 | 400 | tree builtin_function (); |
9282f2f9 | 401 | void shadow_tag_warned (); |
51e29401 RS |
402 | |
403 | static tree lookup_tag (); | |
404 | static tree lookup_tag_reverse (); | |
f062da04 | 405 | tree lookup_name_current_level (); |
51e29401 RS |
406 | static char *redeclaration_error_message (); |
407 | static void layout_array_type (); | |
408 | \f | |
409 | /* C-specific option variables. */ | |
410 | ||
411 | /* Nonzero means allow type mismatches in conditional expressions; | |
412 | just make their values `void'. */ | |
413 | ||
414 | int flag_cond_mismatch; | |
415 | ||
416 | /* Nonzero means give `double' the same size as `float'. */ | |
417 | ||
418 | int flag_short_double; | |
419 | ||
420 | /* Nonzero means don't recognize the keyword `asm'. */ | |
421 | ||
422 | int flag_no_asm; | |
423 | ||
fc3ffe83 | 424 | /* Nonzero means don't recognize any builtin functions. */ |
51e29401 RS |
425 | |
426 | int flag_no_builtin; | |
427 | ||
fc3ffe83 RK |
428 | /* Nonzero means don't recognize the non-ANSI builtin functions. |
429 | -ansi sets this. */ | |
430 | ||
431 | int flag_no_nonansi_builtin; | |
432 | ||
51e29401 RS |
433 | /* Nonzero means do some things the same way PCC does. */ |
434 | ||
435 | int flag_traditional; | |
436 | ||
437 | /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */ | |
438 | ||
439 | int flag_signed_bitfields = 1; | |
7a0347ff | 440 | int explicit_flag_signed_bitfields = 0; |
51e29401 RS |
441 | |
442 | /* Nonzero means handle `#ident' directives. 0 means ignore them. */ | |
443 | ||
444 | int flag_no_ident = 0; | |
445 | ||
446 | /* Nonzero means warn about implicit declarations. */ | |
447 | ||
448 | int warn_implicit; | |
449 | ||
450 | /* Nonzero means give string constants the type `const char *' | |
451 | to get extra warnings from them. These warnings will be too numerous | |
452 | to be useful, except in thoroughly ANSIfied programs. */ | |
453 | ||
454 | int warn_write_strings; | |
455 | ||
456 | /* Nonzero means warn about pointer casts that can drop a type qualifier | |
457 | from the pointer target type. */ | |
458 | ||
459 | int warn_cast_qual; | |
460 | ||
461 | /* Warn about traditional constructs whose meanings changed in ANSI C. */ | |
462 | ||
463 | int warn_traditional; | |
464 | ||
465 | /* Nonzero means warn about sizeof(function) or addition/subtraction | |
466 | of function pointers. */ | |
467 | ||
468 | int warn_pointer_arith; | |
469 | ||
470 | /* Nonzero means warn for non-prototype function decls | |
471 | or non-prototyped defs without previous prototype. */ | |
472 | ||
473 | int warn_strict_prototypes; | |
474 | ||
475 | /* Nonzero means warn for any global function def | |
476 | without separate previous prototype decl. */ | |
477 | ||
478 | int warn_missing_prototypes; | |
479 | ||
480 | /* Nonzero means warn about multiple (redundant) decls for the same single | |
481 | variable or function. */ | |
482 | ||
483 | int warn_redundant_decls = 0; | |
484 | ||
485 | /* Nonzero means warn about extern declarations of objects not at | |
486 | file-scope level and about *all* declarations of functions (whether | |
487 | extern or static) not at file-scope level. Note that we exclude | |
488 | implicit function declarations. To get warnings about those, use | |
489 | -Wimplicit. */ | |
490 | ||
491 | int warn_nested_externs = 0; | |
492 | ||
493 | /* Warn about *printf or *scanf format/argument anomalies. */ | |
494 | ||
495 | int warn_format; | |
496 | ||
497 | /* Warn about a subscript that has type char. */ | |
498 | ||
499 | int warn_char_subscripts = 0; | |
500 | ||
501 | /* Warn if a type conversion is done that might have confusing results. */ | |
502 | ||
503 | int warn_conversion; | |
504 | ||
505 | /* Warn if adding () is suggested. */ | |
506 | ||
929f3671 | 507 | int warn_parentheses; |
51e29401 | 508 | |
36e6fa69 RS |
509 | /* Warn if initializer is not completely bracketed. */ |
510 | ||
511 | int warn_missing_braces; | |
512 | ||
51e29401 RS |
513 | /* Nonzero means `$' can be in an identifier. |
514 | See cccp.c for reasons why this breaks some obscure ANSI C programs. */ | |
515 | ||
516 | #ifndef DOLLARS_IN_IDENTIFIERS | |
517 | #define DOLLARS_IN_IDENTIFIERS 1 | |
518 | #endif | |
519 | int dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1; | |
520 | ||
51e29401 RS |
521 | /* Decode the string P as a language-specific option for C. |
522 | Return 1 if it is recognized (and handle it); | |
523 | return 0 if not recognized. */ | |
524 | ||
525 | int | |
526 | c_decode_option (p) | |
527 | char *p; | |
528 | { | |
529 | if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional")) | |
530 | { | |
531 | flag_traditional = 1; | |
532 | flag_writable_strings = 1; | |
533 | #if DOLLARS_IN_IDENTIFIERS > 0 | |
534 | dollars_in_ident = 1; | |
535 | #endif | |
536 | } | |
4ecc65ac RS |
537 | else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional")) |
538 | { | |
539 | flag_traditional = 0; | |
540 | flag_writable_strings = 0; | |
541 | dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1; | |
542 | } | |
a419ff54 RS |
543 | else if (!strcmp (p, "-fdollars-in-identifiers")) |
544 | { | |
545 | #if DOLLARS_IN_IDENTIFIERS > 0 | |
546 | dollars_in_ident = 1; | |
547 | #endif | |
548 | } | |
549 | else if (!strcmp (p, "-fnodollars-in-identifiers")) | |
550 | dollars_in_ident = 0; | |
51e29401 RS |
551 | else if (!strcmp (p, "-fsigned-char")) |
552 | flag_signed_char = 1; | |
553 | else if (!strcmp (p, "-funsigned-char")) | |
554 | flag_signed_char = 0; | |
555 | else if (!strcmp (p, "-fno-signed-char")) | |
556 | flag_signed_char = 0; | |
557 | else if (!strcmp (p, "-fno-unsigned-char")) | |
558 | flag_signed_char = 1; | |
7a0347ff RS |
559 | else if (!strcmp (p, "-fsigned-bitfields") |
560 | || !strcmp (p, "-fno-unsigned-bitfields")) | |
561 | { | |
562 | flag_signed_bitfields = 1; | |
563 | explicit_flag_signed_bitfields = 1; | |
564 | } | |
565 | else if (!strcmp (p, "-funsigned-bitfields") | |
566 | || !strcmp (p, "-fno-signed-bitfields")) | |
567 | { | |
568 | flag_signed_bitfields = 0; | |
569 | explicit_flag_signed_bitfields = 1; | |
570 | } | |
51e29401 RS |
571 | else if (!strcmp (p, "-fshort-enums")) |
572 | flag_short_enums = 1; | |
573 | else if (!strcmp (p, "-fno-short-enums")) | |
574 | flag_short_enums = 0; | |
575 | else if (!strcmp (p, "-fcond-mismatch")) | |
576 | flag_cond_mismatch = 1; | |
577 | else if (!strcmp (p, "-fno-cond-mismatch")) | |
578 | flag_cond_mismatch = 0; | |
579 | else if (!strcmp (p, "-fshort-double")) | |
580 | flag_short_double = 1; | |
581 | else if (!strcmp (p, "-fno-short-double")) | |
582 | flag_short_double = 0; | |
583 | else if (!strcmp (p, "-fasm")) | |
584 | flag_no_asm = 0; | |
585 | else if (!strcmp (p, "-fno-asm")) | |
586 | flag_no_asm = 1; | |
587 | else if (!strcmp (p, "-fbuiltin")) | |
588 | flag_no_builtin = 0; | |
589 | else if (!strcmp (p, "-fno-builtin")) | |
590 | flag_no_builtin = 1; | |
591 | else if (!strcmp (p, "-fno-ident")) | |
592 | flag_no_ident = 1; | |
593 | else if (!strcmp (p, "-fident")) | |
594 | flag_no_ident = 0; | |
595 | else if (!strcmp (p, "-ansi")) | |
fc3ffe83 | 596 | flag_no_asm = 1, flag_no_nonansi_builtin = 1, dollars_in_ident = 0; |
51e29401 RS |
597 | else if (!strcmp (p, "-Wimplicit")) |
598 | warn_implicit = 1; | |
599 | else if (!strcmp (p, "-Wno-implicit")) | |
600 | warn_implicit = 0; | |
601 | else if (!strcmp (p, "-Wwrite-strings")) | |
602 | warn_write_strings = 1; | |
603 | else if (!strcmp (p, "-Wno-write-strings")) | |
604 | warn_write_strings = 0; | |
605 | else if (!strcmp (p, "-Wcast-qual")) | |
606 | warn_cast_qual = 1; | |
607 | else if (!strcmp (p, "-Wno-cast-qual")) | |
608 | warn_cast_qual = 0; | |
609 | else if (!strcmp (p, "-Wpointer-arith")) | |
610 | warn_pointer_arith = 1; | |
611 | else if (!strcmp (p, "-Wno-pointer-arith")) | |
612 | warn_pointer_arith = 0; | |
613 | else if (!strcmp (p, "-Wstrict-prototypes")) | |
614 | warn_strict_prototypes = 1; | |
615 | else if (!strcmp (p, "-Wno-strict-prototypes")) | |
616 | warn_strict_prototypes = 0; | |
617 | else if (!strcmp (p, "-Wmissing-prototypes")) | |
618 | warn_missing_prototypes = 1; | |
619 | else if (!strcmp (p, "-Wno-missing-prototypes")) | |
620 | warn_missing_prototypes = 0; | |
621 | else if (!strcmp (p, "-Wredundant-decls")) | |
622 | warn_redundant_decls = 1; | |
ec2343c4 | 623 | else if (!strcmp (p, "-Wno-redundant-decls")) |
51e29401 RS |
624 | warn_redundant_decls = 0; |
625 | else if (!strcmp (p, "-Wnested-externs")) | |
626 | warn_nested_externs = 1; | |
627 | else if (!strcmp (p, "-Wno-nested-externs")) | |
628 | warn_nested_externs = 0; | |
629 | else if (!strcmp (p, "-Wtraditional")) | |
630 | warn_traditional = 1; | |
631 | else if (!strcmp (p, "-Wno-traditional")) | |
632 | warn_traditional = 0; | |
633 | else if (!strcmp (p, "-Wformat")) | |
634 | warn_format = 1; | |
635 | else if (!strcmp (p, "-Wno-format")) | |
636 | warn_format = 0; | |
637 | else if (!strcmp (p, "-Wchar-subscripts")) | |
638 | warn_char_subscripts = 1; | |
639 | else if (!strcmp (p, "-Wno-char-subscripts")) | |
640 | warn_char_subscripts = 0; | |
641 | else if (!strcmp (p, "-Wconversion")) | |
642 | warn_conversion = 1; | |
643 | else if (!strcmp (p, "-Wno-conversion")) | |
644 | warn_conversion = 0; | |
645 | else if (!strcmp (p, "-Wparentheses")) | |
646 | warn_parentheses = 1; | |
647 | else if (!strcmp (p, "-Wno-parentheses")) | |
648 | warn_parentheses = 0; | |
57916f61 RS |
649 | else if (!strcmp (p, "-Wreturn-type")) |
650 | warn_return_type = 1; | |
651 | else if (!strcmp (p, "-Wno-return-type")) | |
652 | warn_return_type = 0; | |
51e29401 RS |
653 | else if (!strcmp (p, "-Wcomment")) |
654 | ; /* cpp handles this one. */ | |
655 | else if (!strcmp (p, "-Wno-comment")) | |
656 | ; /* cpp handles this one. */ | |
657 | else if (!strcmp (p, "-Wcomments")) | |
658 | ; /* cpp handles this one. */ | |
659 | else if (!strcmp (p, "-Wno-comments")) | |
660 | ; /* cpp handles this one. */ | |
661 | else if (!strcmp (p, "-Wtrigraphs")) | |
662 | ; /* cpp handles this one. */ | |
663 | else if (!strcmp (p, "-Wno-trigraphs")) | |
664 | ; /* cpp handles this one. */ | |
fc3ffe83 RK |
665 | else if (!strcmp (p, "-Wimport")) |
666 | ; /* cpp handles this one. */ | |
667 | else if (!strcmp (p, "-Wno-import")) | |
668 | ; /* cpp handles this one. */ | |
36e6fa69 RS |
669 | else if (!strcmp (p, "-Wmissing-braces")) |
670 | warn_missing_braces = 1; | |
671 | else if (!strcmp (p, "-Wno-missing-braces")) | |
672 | warn_missing_braces = 0; | |
51e29401 RS |
673 | else if (!strcmp (p, "-Wall")) |
674 | { | |
675 | extra_warnings = 1; | |
a2468e45 BK |
676 | /* We save the value of warn_uninitialized, since if they put |
677 | -Wuninitialized on the command line, we need to generate a | |
678 | warning about not using it without also specifying -O. */ | |
679 | if (warn_uninitialized != 1) | |
680 | warn_uninitialized = 2; | |
51e29401 RS |
681 | warn_implicit = 1; |
682 | warn_return_type = 1; | |
683 | warn_unused = 1; | |
684 | warn_switch = 1; | |
685 | warn_format = 1; | |
686 | warn_char_subscripts = 1; | |
929f3671 | 687 | warn_parentheses = 1; |
36e6fa69 | 688 | warn_missing_braces = 1; |
51e29401 RS |
689 | } |
690 | else | |
691 | return 0; | |
692 | ||
693 | return 1; | |
694 | } | |
695 | ||
696 | /* Hooks for print_node. */ | |
697 | ||
698 | void | |
699 | print_lang_decl () | |
700 | { | |
701 | } | |
702 | ||
703 | void | |
704 | print_lang_type () | |
705 | { | |
706 | } | |
707 | ||
708 | void | |
709 | print_lang_identifier (file, node, indent) | |
710 | FILE *file; | |
711 | tree node; | |
712 | int indent; | |
713 | { | |
714 | print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4); | |
715 | print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4); | |
716 | print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4); | |
717 | print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4); | |
718 | print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4); | |
fd0b8fce | 719 | print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4); |
51e29401 RS |
720 | } |
721 | \f | |
b4892310 RS |
722 | /* Hook called at end of compilation to assume 1 elt |
723 | for a top-level array decl that wasn't complete before. */ | |
724 | ||
725 | void | |
726 | finish_incomplete_decl (decl) | |
727 | tree decl; | |
728 | { | |
729 | if (TREE_CODE (decl) == VAR_DECL && TREE_TYPE (decl) != error_mark_node) | |
730 | { | |
731 | tree type = TREE_TYPE (decl); | |
732 | if (TREE_CODE (type) == ARRAY_TYPE | |
733 | && TYPE_DOMAIN (type) == 0 | |
734 | && TREE_CODE (decl) != TYPE_DECL) | |
735 | { | |
736 | complete_array_type (type, NULL_TREE, 1); | |
737 | ||
738 | layout_decl (decl, 0); | |
739 | } | |
740 | } | |
741 | } | |
742 | \f | |
51e29401 RS |
743 | /* Create a new `struct binding_level'. */ |
744 | ||
745 | static | |
746 | struct binding_level * | |
747 | make_binding_level () | |
748 | { | |
749 | /* NOSTRICT */ | |
750 | return (struct binding_level *) xmalloc (sizeof (struct binding_level)); | |
751 | } | |
752 | ||
753 | /* Nonzero if we are currently in the global binding level. */ | |
754 | ||
755 | int | |
756 | global_bindings_p () | |
757 | { | |
758 | return current_binding_level == global_binding_level; | |
759 | } | |
760 | ||
761 | void | |
762 | keep_next_level () | |
763 | { | |
764 | keep_next_level_flag = 1; | |
765 | } | |
766 | ||
767 | /* Nonzero if the current level needs to have a BLOCK made. */ | |
768 | ||
769 | int | |
770 | kept_level_p () | |
771 | { | |
772 | return ((current_binding_level->keep_if_subblocks | |
773 | && current_binding_level->blocks != 0) | |
774 | || current_binding_level->keep | |
775 | || current_binding_level->names != 0 | |
776 | || (current_binding_level->tags != 0 | |
777 | && !current_binding_level->tag_transparent)); | |
778 | } | |
779 | ||
780 | /* Identify this binding level as a level of parameters. | |
89d7540d RS |
781 | DEFINITION_FLAG is 1 for a definition, 0 for a declaration. |
782 | But it turns out there is no way to pass the right value for | |
783 | DEFINITION_FLAG, so we ignore it. */ | |
51e29401 RS |
784 | |
785 | void | |
786 | declare_parm_level (definition_flag) | |
787 | int definition_flag; | |
788 | { | |
89d7540d | 789 | current_binding_level->parm_flag = 1; |
51e29401 RS |
790 | } |
791 | ||
792 | /* Nonzero if currently making parm declarations. */ | |
793 | ||
794 | int | |
795 | in_parm_level_p () | |
796 | { | |
797 | return current_binding_level->parm_flag; | |
798 | } | |
799 | ||
800 | /* Enter a new binding level. | |
801 | If TAG_TRANSPARENT is nonzero, do so only for the name space of variables, | |
802 | not for that of tags. */ | |
803 | ||
804 | void | |
805 | pushlevel (tag_transparent) | |
806 | int tag_transparent; | |
807 | { | |
808 | register struct binding_level *newlevel = NULL_BINDING_LEVEL; | |
809 | ||
810 | /* If this is the top level of a function, | |
811 | just make sure that NAMED_LABELS is 0. */ | |
812 | ||
813 | if (current_binding_level == global_binding_level) | |
814 | { | |
815 | named_labels = 0; | |
816 | } | |
817 | ||
818 | /* Reuse or create a struct for this binding level. */ | |
819 | ||
820 | if (free_binding_level) | |
821 | { | |
822 | newlevel = free_binding_level; | |
823 | free_binding_level = free_binding_level->level_chain; | |
824 | } | |
825 | else | |
826 | { | |
827 | newlevel = make_binding_level (); | |
828 | } | |
829 | ||
830 | /* Add this level to the front of the chain (stack) of levels that | |
831 | are active. */ | |
832 | ||
833 | *newlevel = clear_binding_level; | |
834 | newlevel->tag_transparent | |
835 | = (tag_transparent | |
836 | || (current_binding_level | |
837 | ? current_binding_level->subblocks_tag_transparent | |
838 | : 0)); | |
839 | newlevel->level_chain = current_binding_level; | |
840 | current_binding_level = newlevel; | |
841 | newlevel->keep = keep_next_level_flag; | |
842 | keep_next_level_flag = 0; | |
843 | newlevel->keep_if_subblocks = keep_next_if_subblocks; | |
844 | keep_next_if_subblocks = 0; | |
845 | } | |
846 | ||
847 | /* Exit a binding level. | |
848 | Pop the level off, and restore the state of the identifier-decl mappings | |
849 | that were in effect when this level was entered. | |
850 | ||
851 | If KEEP is nonzero, this level had explicit declarations, so | |
852 | and create a "block" (a BLOCK node) for the level | |
853 | to record its declarations and subblocks for symbol table output. | |
854 | ||
855 | If FUNCTIONBODY is nonzero, this level is the body of a function, | |
856 | so create a block as if KEEP were set and also clear out all | |
857 | label names. | |
858 | ||
859 | If REVERSE is nonzero, reverse the order of decls before putting | |
860 | them into the BLOCK. */ | |
861 | ||
862 | tree | |
863 | poplevel (keep, reverse, functionbody) | |
864 | int keep; | |
865 | int reverse; | |
866 | int functionbody; | |
867 | { | |
868 | register tree link; | |
869 | /* The chain of decls was accumulated in reverse order. | |
870 | Put it into forward order, just for cleanliness. */ | |
871 | tree decls; | |
872 | tree tags = current_binding_level->tags; | |
873 | tree subblocks = current_binding_level->blocks; | |
874 | tree block = 0; | |
875 | tree decl; | |
968e5643 | 876 | int block_previously_created; |
51e29401 RS |
877 | |
878 | keep |= current_binding_level->keep; | |
879 | ||
880 | /* This warning is turned off because it causes warnings for | |
881 | declarations like `extern struct foo *x'. */ | |
882 | #if 0 | |
883 | /* Warn about incomplete structure types in this level. */ | |
884 | for (link = tags; link; link = TREE_CHAIN (link)) | |
885 | if (TYPE_SIZE (TREE_VALUE (link)) == 0) | |
886 | { | |
887 | tree type = TREE_VALUE (link); | |
888 | char *errmsg; | |
889 | switch (TREE_CODE (type)) | |
890 | { | |
891 | case RECORD_TYPE: | |
892 | errmsg = "`struct %s' incomplete in scope ending here"; | |
893 | break; | |
894 | case UNION_TYPE: | |
895 | errmsg = "`union %s' incomplete in scope ending here"; | |
896 | break; | |
897 | case ENUMERAL_TYPE: | |
898 | errmsg = "`enum %s' incomplete in scope ending here"; | |
899 | break; | |
900 | } | |
901 | if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
902 | error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type))); | |
903 | else | |
904 | /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */ | |
905 | error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)))); | |
906 | } | |
907 | #endif /* 0 */ | |
908 | ||
909 | /* Get the decls in the order they were written. | |
910 | Usually current_binding_level->names is in reverse order. | |
911 | But parameter decls were previously put in forward order. */ | |
912 | ||
913 | if (reverse) | |
914 | current_binding_level->names | |
915 | = decls = nreverse (current_binding_level->names); | |
916 | else | |
917 | decls = current_binding_level->names; | |
918 | ||
919 | /* Output any nested inline functions within this block | |
920 | if they weren't already output. */ | |
921 | ||
922 | for (decl = decls; decl; decl = TREE_CHAIN (decl)) | |
923 | if (TREE_CODE (decl) == FUNCTION_DECL | |
924 | && ! TREE_ASM_WRITTEN (decl) | |
925 | && DECL_INITIAL (decl) != 0 | |
926 | && TREE_ADDRESSABLE (decl)) | |
42dfa47f RS |
927 | { |
928 | /* If this decl was copied from a file-scope decl | |
929 | on account of a block-scope extern decl, | |
930 | propagate TREE_ADDRESSABLE to the file-scope decl. */ | |
931 | if (DECL_ABSTRACT_ORIGIN (decl) != 0) | |
932 | TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1; | |
933 | else | |
47df0262 RK |
934 | { |
935 | push_function_context (); | |
936 | output_inline_function (decl); | |
937 | pop_function_context (); | |
938 | } | |
42dfa47f | 939 | } |
51e29401 RS |
940 | |
941 | /* If there were any declarations or structure tags in that level, | |
942 | or if this level is a function body, | |
943 | create a BLOCK to record them for the life of this function. */ | |
944 | ||
3bf40d18 | 945 | block = 0; |
968e5643 RS |
946 | block_previously_created = (current_binding_level->this_block != 0); |
947 | if (block_previously_created) | |
3bf40d18 RS |
948 | block = current_binding_level->this_block; |
949 | else if (keep || functionbody | |
950 | || (current_binding_level->keep_if_subblocks && subblocks != 0)) | |
951 | block = make_node (BLOCK); | |
952 | if (block != 0) | |
953 | { | |
954 | BLOCK_VARS (block) = decls; | |
955 | BLOCK_TYPE_TAGS (block) = tags; | |
956 | BLOCK_SUBBLOCKS (block) = subblocks; | |
4ecc65ac | 957 | remember_end_note (block); |
3bf40d18 | 958 | } |
51e29401 RS |
959 | |
960 | /* In each subblock, record that this is its superior. */ | |
961 | ||
962 | for (link = subblocks; link; link = TREE_CHAIN (link)) | |
963 | BLOCK_SUPERCONTEXT (link) = block; | |
964 | ||
965 | /* Clear out the meanings of the local variables of this level. */ | |
966 | ||
967 | for (link = decls; link; link = TREE_CHAIN (link)) | |
968 | { | |
969 | if (DECL_NAME (link) != 0) | |
970 | { | |
971 | /* If the ident. was used or addressed via a local extern decl, | |
972 | don't forget that fact. */ | |
1394aabd | 973 | if (DECL_EXTERNAL (link)) |
51e29401 RS |
974 | { |
975 | if (TREE_USED (link)) | |
976 | TREE_USED (DECL_NAME (link)) = 1; | |
977 | if (TREE_ADDRESSABLE (link)) | |
978 | TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1; | |
979 | } | |
980 | IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0; | |
981 | } | |
982 | } | |
983 | ||
984 | /* Restore all name-meanings of the outer levels | |
985 | that were shadowed by this level. */ | |
986 | ||
987 | for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link)) | |
988 | IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link); | |
989 | ||
990 | /* If the level being exited is the top level of a function, | |
991 | check over all the labels, and clear out the current | |
992 | (function local) meanings of their names. */ | |
993 | ||
994 | if (functionbody) | |
995 | { | |
996 | /* If this is the top level block of a function, | |
997 | the vars are the function's parameters. | |
998 | Don't leave them in the BLOCK because they are | |
999 | found in the FUNCTION_DECL instead. */ | |
1000 | ||
1001 | BLOCK_VARS (block) = 0; | |
1002 | ||
1003 | /* Clear out the definitions of all label names, | |
1004 | since their scopes end here, | |
1005 | and add them to BLOCK_VARS. */ | |
1006 | ||
1007 | for (link = named_labels; link; link = TREE_CHAIN (link)) | |
1008 | { | |
1009 | register tree label = TREE_VALUE (link); | |
1010 | ||
1011 | if (DECL_INITIAL (label) == 0) | |
1012 | { | |
1013 | error_with_decl (label, "label `%s' used but not defined"); | |
1014 | /* Avoid crashing later. */ | |
1015 | define_label (input_filename, lineno, | |
1016 | DECL_NAME (label)); | |
1017 | } | |
1018 | else if (warn_unused && !TREE_USED (label)) | |
1019 | warning_with_decl (label, "label `%s' defined but not used"); | |
1020 | IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0; | |
1021 | ||
1022 | /* Put the labels into the "variables" of the | |
1023 | top-level block, so debugger can see them. */ | |
1024 | TREE_CHAIN (label) = BLOCK_VARS (block); | |
1025 | BLOCK_VARS (block) = label; | |
1026 | } | |
1027 | } | |
1028 | ||
1029 | /* Pop the current level, and free the structure for reuse. */ | |
1030 | ||
1031 | { | |
1032 | register struct binding_level *level = current_binding_level; | |
1033 | current_binding_level = current_binding_level->level_chain; | |
1034 | ||
1035 | level->level_chain = free_binding_level; | |
1036 | free_binding_level = level; | |
1037 | } | |
1038 | ||
1039 | /* Dispose of the block that we just made inside some higher level. */ | |
1040 | if (functionbody) | |
1041 | DECL_INITIAL (current_function_decl) = block; | |
1042 | else if (block) | |
968e5643 RS |
1043 | { |
1044 | if (!block_previously_created) | |
1045 | current_binding_level->blocks | |
1046 | = chainon (current_binding_level->blocks, block); | |
1047 | } | |
51e29401 RS |
1048 | /* If we did not make a block for the level just exited, |
1049 | any blocks made for inner levels | |
1050 | (since they cannot be recorded as subblocks in that level) | |
1051 | must be carried forward so they will later become subblocks | |
1052 | of something else. */ | |
1053 | else if (subblocks) | |
1054 | current_binding_level->blocks | |
1055 | = chainon (current_binding_level->blocks, subblocks); | |
1056 | ||
1057 | /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this | |
1058 | binding contour so that they point to the appropriate construct, i.e. | |
1059 | either to the current FUNCTION_DECL node, or else to the BLOCK node | |
1060 | we just constructed. | |
1061 | ||
1062 | Note that for tagged types whose scope is just the formal parameter | |
1063 | list for some function type specification, we can't properly set | |
1064 | their TYPE_CONTEXTs here, because we don't have a pointer to the | |
1065 | appropriate FUNCTION_TYPE node readily available to us. For those | |
1066 | cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set | |
1067 | in `grokdeclarator' as soon as we have created the FUNCTION_TYPE | |
1068 | node which will represent the "scope" for these "parameter list local" | |
1069 | tagged types. | |
1070 | */ | |
1071 | ||
1072 | if (functionbody) | |
1073 | for (link = tags; link; link = TREE_CHAIN (link)) | |
1074 | TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl; | |
1075 | else if (block) | |
1076 | for (link = tags; link; link = TREE_CHAIN (link)) | |
1077 | TYPE_CONTEXT (TREE_VALUE (link)) = block; | |
1078 | ||
1079 | if (block) | |
1080 | TREE_USED (block) = 1; | |
1081 | return block; | |
1082 | } | |
3bf40d18 RS |
1083 | |
1084 | /* Delete the node BLOCK from the current binding level. | |
1085 | This is used for the block inside a stmt expr ({...}) | |
1086 | so that the block can be reinserted where appropriate. */ | |
1087 | ||
1088 | void | |
1089 | delete_block (block) | |
1090 | tree block; | |
1091 | { | |
1092 | tree t; | |
1093 | if (current_binding_level->blocks == block) | |
1094 | current_binding_level->blocks = TREE_CHAIN (block); | |
1095 | for (t = current_binding_level->blocks; t;) | |
1096 | { | |
1097 | if (TREE_CHAIN (t) == block) | |
1098 | TREE_CHAIN (t) = TREE_CHAIN (block); | |
1099 | else | |
1100 | t = TREE_CHAIN (t); | |
1101 | } | |
1102 | TREE_CHAIN (block) = NULL; | |
1103 | /* Clear TREE_USED which is always set by poplevel. | |
1104 | The flag is set again if insert_block is called. */ | |
1105 | TREE_USED (block) = 0; | |
1106 | } | |
1107 | ||
1108 | /* Insert BLOCK at the end of the list of subblocks of the | |
1109 | current binding level. This is used when a BIND_EXPR is expanded, | |
6f65afb0 | 1110 | to handle the BLOCK node inside the BIND_EXPR. */ |
3bf40d18 RS |
1111 | |
1112 | void | |
1113 | insert_block (block) | |
1114 | tree block; | |
1115 | { | |
1116 | TREE_USED (block) = 1; | |
1117 | current_binding_level->blocks | |
1118 | = chainon (current_binding_level->blocks, block); | |
1119 | } | |
1120 | ||
968e5643 | 1121 | /* Set the BLOCK node for the innermost scope |
3bf40d18 RS |
1122 | (the one we are currently in). */ |
1123 | ||
968e5643 RS |
1124 | void |
1125 | set_block (block) | |
1126 | register tree block; | |
3bf40d18 | 1127 | { |
968e5643 | 1128 | current_binding_level->this_block = block; |
3bf40d18 | 1129 | } |
51e29401 RS |
1130 | \f |
1131 | void | |
1132 | push_label_level () | |
1133 | { | |
1134 | register struct binding_level *newlevel; | |
1135 | ||
1136 | /* Reuse or create a struct for this binding level. */ | |
1137 | ||
1138 | if (free_binding_level) | |
1139 | { | |
1140 | newlevel = free_binding_level; | |
1141 | free_binding_level = free_binding_level->level_chain; | |
1142 | } | |
1143 | else | |
1144 | { | |
1145 | newlevel = make_binding_level (); | |
1146 | } | |
1147 | ||
1148 | /* Add this level to the front of the chain (stack) of label levels. */ | |
1149 | ||
1150 | newlevel->level_chain = label_level_chain; | |
1151 | label_level_chain = newlevel; | |
1152 | ||
1153 | newlevel->names = named_labels; | |
1154 | newlevel->shadowed = shadowed_labels; | |
1155 | named_labels = 0; | |
1156 | shadowed_labels = 0; | |
1157 | } | |
1158 | ||
1159 | void | |
1160 | pop_label_level () | |
1161 | { | |
1162 | register struct binding_level *level = label_level_chain; | |
1163 | tree link, prev; | |
1164 | ||
1165 | /* Clear out the definitions of the declared labels in this level. | |
1166 | Leave in the list any ordinary, non-declared labels. */ | |
1167 | for (link = named_labels, prev = 0; link;) | |
1168 | { | |
1169 | if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link))) | |
1170 | { | |
1171 | if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0) | |
1172 | { | |
6b2a374b RK |
1173 | error_with_decl (TREE_VALUE (link), |
1174 | "label `%s' used but not defined"); | |
51e29401 RS |
1175 | /* Avoid crashing later. */ |
1176 | define_label (input_filename, lineno, | |
1177 | DECL_NAME (TREE_VALUE (link))); | |
1178 | } | |
1179 | else if (warn_unused && !TREE_USED (TREE_VALUE (link))) | |
1180 | warning_with_decl (TREE_VALUE (link), | |
1181 | "label `%s' defined but not used"); | |
1182 | IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0; | |
1183 | ||
1184 | /* Delete this element from the list. */ | |
1185 | link = TREE_CHAIN (link); | |
1186 | if (prev) | |
1187 | TREE_CHAIN (prev) = link; | |
1188 | else | |
1189 | named_labels = link; | |
1190 | } | |
1191 | else | |
1192 | { | |
1193 | prev = link; | |
1194 | link = TREE_CHAIN (link); | |
1195 | } | |
1196 | } | |
1197 | ||
1198 | /* Bring back all the labels that were shadowed. */ | |
1199 | for (link = shadowed_labels; link; link = TREE_CHAIN (link)) | |
1200 | if (DECL_NAME (TREE_VALUE (link)) != 0) | |
1201 | IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) | |
1202 | = TREE_VALUE (link); | |
1203 | ||
1204 | named_labels = chainon (named_labels, level->names); | |
1205 | shadowed_labels = level->shadowed; | |
1206 | ||
1207 | /* Pop the current level, and free the structure for reuse. */ | |
1208 | label_level_chain = label_level_chain->level_chain; | |
1209 | level->level_chain = free_binding_level; | |
1210 | free_binding_level = level; | |
1211 | } | |
1212 | \f | |
1213 | /* Push a definition or a declaration of struct, union or enum tag "name". | |
1214 | "type" should be the type node. | |
1215 | We assume that the tag "name" is not already defined. | |
1216 | ||
1217 | Note that the definition may really be just a forward reference. | |
1218 | In that case, the TYPE_SIZE will be zero. */ | |
1219 | ||
1220 | void | |
1221 | pushtag (name, type) | |
1222 | tree name, type; | |
1223 | { | |
1224 | register struct binding_level *b; | |
1225 | ||
1226 | /* Find the proper binding level for this type tag. */ | |
1227 | ||
1228 | for (b = current_binding_level; b->tag_transparent; b = b->level_chain) | |
1229 | continue; | |
1230 | ||
1231 | if (name) | |
1232 | { | |
1233 | /* Record the identifier as the type's name if it has none. */ | |
1234 | ||
1235 | if (TYPE_NAME (type) == 0) | |
1236 | TYPE_NAME (type) = name; | |
51e29401 RS |
1237 | } |
1238 | ||
c138f328 RS |
1239 | if (b == global_binding_level) |
1240 | b->tags = perm_tree_cons (name, type, b->tags); | |
1241 | else | |
1242 | b->tags = saveable_tree_cons (name, type, b->tags); | |
1243 | ||
51e29401 RS |
1244 | /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the |
1245 | tagged type we just added to the current binding level. This fake | |
1246 | NULL-named TYPE_DECL node helps dwarfout.c to know when it needs | |
858a47b1 | 1247 | to output a representation of a tagged type, and it also gives |
51e29401 RS |
1248 | us a convenient place to record the "scope start" address for the |
1249 | tagged type. */ | |
1250 | ||
8d9bfdc5 | 1251 | TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type)); |
51e29401 RS |
1252 | } |
1253 | \f | |
1254 | /* Handle when a new declaration NEWDECL | |
1255 | has the same name as an old one OLDDECL | |
1256 | in the same binding contour. | |
1257 | Prints an error message if appropriate. | |
1258 | ||
1259 | If safely possible, alter OLDDECL to look like NEWDECL, and return 1. | |
1260 | Otherwise, return 0. */ | |
1261 | ||
1262 | static int | |
1263 | duplicate_decls (newdecl, olddecl) | |
1264 | register tree newdecl, olddecl; | |
1265 | { | |
1266 | int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl)); | |
1267 | int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL | |
1268 | && DECL_INITIAL (newdecl) != 0); | |
664b4b1e RS |
1269 | tree oldtype = TREE_TYPE (olddecl); |
1270 | tree newtype = TREE_TYPE (newdecl); | |
51e29401 | 1271 | |
664b4b1e RS |
1272 | if (TREE_CODE (newtype) == ERROR_MARK |
1273 | || TREE_CODE (oldtype) == ERROR_MARK) | |
51e29401 RS |
1274 | types_match = 0; |
1275 | ||
1276 | /* New decl is completely inconsistent with the old one => | |
1277 | tell caller to replace the old one. | |
1278 | This is always an error except in the case of shadowing a builtin. */ | |
1279 | if (TREE_CODE (olddecl) != TREE_CODE (newdecl)) | |
1280 | { | |
1281 | if (TREE_CODE (olddecl) == FUNCTION_DECL | |
1282 | && DECL_BUILT_IN (olddecl)) | |
1283 | { | |
1284 | /* If you declare a built-in function name as static, the | |
1285 | built-in definition is overridden, | |
1286 | but optionally warn this was a bad choice of name. */ | |
1287 | if (!TREE_PUBLIC (newdecl)) | |
1288 | { | |
1289 | if (warn_shadow) | |
1290 | warning_with_decl (newdecl, "shadowing built-in function `%s'"); | |
1291 | } | |
1292 | /* Likewise, if the built-in is not ansi, then programs can | |
929f3671 | 1293 | override it even globally without an error. */ |
51e29401 RS |
1294 | else if (DECL_BUILT_IN_NONANSI (olddecl)) |
1295 | warning_with_decl (newdecl, | |
1296 | "built-in function `%s' declared as non-function"); | |
1297 | else | |
1298 | error_with_decl (newdecl, | |
1299 | "built-in function `%s' declared as non-function"); | |
1300 | } | |
1301 | else if (TREE_CODE (olddecl) == FUNCTION_DECL | |
1302 | && DECL_BUILT_IN_NONANSI (olddecl)) | |
1303 | { | |
1304 | /* If overriding decl is static, | |
1305 | optionally warn this was a bad choice of name. */ | |
1306 | if (!TREE_PUBLIC (newdecl)) | |
1307 | { | |
1308 | if (warn_shadow) | |
1309 | warning_with_decl (newdecl, "shadowing library function `%s'"); | |
1310 | } | |
1311 | /* Otherwise, always warn. */ | |
1312 | else | |
1313 | warning_with_decl (newdecl, | |
1314 | "library function `%s' declared as non-function"); | |
1315 | } | |
1316 | else | |
1317 | { | |
1318 | error_with_decl (newdecl, "`%s' redeclared as different kind of symbol"); | |
1319 | error_with_decl (olddecl, "previous declaration of `%s'"); | |
1320 | } | |
1321 | ||
1322 | return 0; | |
1323 | } | |
1324 | ||
1325 | /* For real parm decl following a forward decl, | |
1326 | return 1 so old decl will be reused. */ | |
1327 | if (types_match && TREE_CODE (newdecl) == PARM_DECL | |
1328 | && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl)) | |
1329 | return 1; | |
1330 | ||
1331 | /* The new declaration is the same kind of object as the old one. | |
1332 | The declarations may partially match. Print warnings if they don't | |
1333 | match enough. Ultimately, copy most of the information from the new | |
1334 | decl to the old one, and keep using the old one. */ | |
1335 | ||
1336 | if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL | |
1337 | && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl | |
1338 | && DECL_INITIAL (olddecl) == 0) | |
1339 | /* If -traditional, avoid error for redeclaring fcn | |
1340 | after implicit decl. */ | |
1341 | ; | |
1342 | else if (TREE_CODE (olddecl) == FUNCTION_DECL | |
1343 | && DECL_BUILT_IN (olddecl)) | |
1344 | { | |
e841f997 | 1345 | /* A function declaration for a built-in function. */ |
51e29401 RS |
1346 | if (!TREE_PUBLIC (newdecl)) |
1347 | { | |
1348 | /* If you declare a built-in function name as static, the | |
1349 | built-in definition is overridden, | |
1350 | but optionally warn this was a bad choice of name. */ | |
1351 | if (warn_shadow) | |
1352 | warning_with_decl (newdecl, "shadowing built-in function `%s'"); | |
1353 | /* Discard the old built-in function. */ | |
1354 | return 0; | |
1355 | } | |
1356 | else if (!types_match) | |
4c41bbfa RS |
1357 | { |
1358 | /* Accept the return type of the new declaration if same modes. */ | |
1359 | tree oldreturntype = TREE_TYPE (TREE_TYPE (olddecl)); | |
1360 | tree newreturntype = TREE_TYPE (TREE_TYPE (newdecl)); | |
1361 | if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype)) | |
1362 | { | |
32436219 RS |
1363 | /* Function types may be shared, so we can't just modify |
1364 | the return type of olddecl's function type. */ | |
1365 | tree newtype | |
1366 | = build_function_type (newreturntype, | |
1367 | TYPE_ARG_TYPES (TREE_TYPE (olddecl))); | |
1368 | ||
1f7586c1 RS |
1369 | types_match = comptypes (TREE_TYPE (newdecl), newtype); |
1370 | if (types_match) | |
1371 | TREE_TYPE (olddecl) = newtype; | |
1372 | } | |
1373 | /* Accept harmless mismatch in first argument type also. | |
1374 | This is for ffs. */ | |
1375 | if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0 | |
1376 | && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0 | |
1377 | && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))) != 0 | |
1378 | && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl))) != 0 | |
1379 | && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl)))) | |
1380 | == | |
1381 | TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl)))))) | |
1382 | { | |
1383 | /* Function types may be shared, so we can't just modify | |
1384 | the return type of olddecl's function type. */ | |
1385 | tree newtype | |
1386 | = build_function_type (TREE_TYPE (TREE_TYPE (olddecl)), | |
1387 | tree_cons (NULL_TREE, | |
1388 | TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))), | |
1389 | TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (olddecl))))); | |
1390 | ||
32436219 RS |
1391 | types_match = comptypes (TREE_TYPE (newdecl), newtype); |
1392 | if (types_match) | |
1393 | TREE_TYPE (olddecl) = newtype; | |
4c41bbfa RS |
1394 | } |
1395 | } | |
1396 | if (!types_match) | |
52b6a22f RS |
1397 | { |
1398 | /* If types don't match for a built-in, throw away the built-in. */ | |
1399 | warning_with_decl (newdecl, "conflicting types for built-in function `%s'"); | |
1400 | return 0; | |
1401 | } | |
51e29401 RS |
1402 | } |
1403 | else if (TREE_CODE (olddecl) == FUNCTION_DECL | |
e841f997 | 1404 | && DECL_SOURCE_LINE (olddecl) == 0) |
51e29401 | 1405 | { |
e841f997 RS |
1406 | /* A function declaration for a predeclared function |
1407 | that isn't actually built in. */ | |
51e29401 RS |
1408 | if (!TREE_PUBLIC (newdecl)) |
1409 | { | |
858a47b1 | 1410 | /* If you declare it as static, the |
e841f997 | 1411 | default definition is overridden. */ |
51e29401 RS |
1412 | return 0; |
1413 | } | |
1414 | else if (!types_match) | |
e841f997 | 1415 | { |
4d06f145 RS |
1416 | /* If the types don't match, preserve volatility indication. |
1417 | Later on, we will discard everything else about the | |
1418 | default declaration. */ | |
e841f997 | 1419 | TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl); |
e841f997 | 1420 | } |
51e29401 | 1421 | } |
592252ad RS |
1422 | /* Permit char *foo () to match void *foo (...) if not pedantic, |
1423 | if one of them came from a system header file. */ | |
a4219ac7 RS |
1424 | else if (!types_match |
1425 | && TREE_CODE (olddecl) == FUNCTION_DECL | |
1426 | && TREE_CODE (newdecl) == FUNCTION_DECL | |
664b4b1e RS |
1427 | && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE |
1428 | && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE | |
592252ad RS |
1429 | && (DECL_IN_SYSTEM_HEADER (olddecl) |
1430 | || DECL_IN_SYSTEM_HEADER (newdecl)) | |
5fe86b8b | 1431 | && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node |
664b4b1e RS |
1432 | && TYPE_ARG_TYPES (oldtype) == 0 |
1433 | && self_promoting_args_p (TYPE_ARG_TYPES (newtype)) | |
1434 | && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node) | |
a4219ac7 | 1435 | || |
664b4b1e RS |
1436 | (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node |
1437 | && TYPE_ARG_TYPES (newtype) == 0 | |
1438 | && self_promoting_args_p (TYPE_ARG_TYPES (oldtype)) | |
5fe86b8b | 1439 | && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node))) |
a4219ac7 RS |
1440 | { |
1441 | if (pedantic) | |
1442 | pedwarn_with_decl (newdecl, "conflicting types for `%s'"); | |
664b4b1e | 1443 | /* Make sure we keep void * as ret type, not char *. */ |
5fe86b8b | 1444 | if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node) |
664b4b1e | 1445 | TREE_TYPE (newdecl) = newtype = oldtype; |
a4219ac7 | 1446 | } |
51e29401 RS |
1447 | else if (!types_match |
1448 | /* Permit char *foo (int, ...); followed by char *foo (); | |
1449 | if not pedantic. */ | |
1450 | && ! (TREE_CODE (olddecl) == FUNCTION_DECL | |
1451 | && ! pedantic | |
1452 | /* Return types must still match. */ | |
664b4b1e RS |
1453 | && comptypes (TREE_TYPE (oldtype), |
1454 | TREE_TYPE (newtype)) | |
1455 | && TYPE_ARG_TYPES (newtype) == 0)) | |
51e29401 RS |
1456 | { |
1457 | error_with_decl (newdecl, "conflicting types for `%s'"); | |
1458 | /* Check for function type mismatch | |
1459 | involving an empty arglist vs a nonempty one. */ | |
1460 | if (TREE_CODE (olddecl) == FUNCTION_DECL | |
664b4b1e RS |
1461 | && comptypes (TREE_TYPE (oldtype), |
1462 | TREE_TYPE (newtype)) | |
1463 | && ((TYPE_ARG_TYPES (oldtype) == 0 | |
51e29401 RS |
1464 | && DECL_INITIAL (olddecl) == 0) |
1465 | || | |
664b4b1e | 1466 | (TYPE_ARG_TYPES (newtype) == 0 |
51e29401 RS |
1467 | && DECL_INITIAL (newdecl) == 0))) |
1468 | { | |
1469 | /* Classify the problem further. */ | |
664b4b1e | 1470 | register tree t = TYPE_ARG_TYPES (oldtype); |
51e29401 | 1471 | if (t == 0) |
664b4b1e | 1472 | t = TYPE_ARG_TYPES (newtype); |
51e29401 RS |
1473 | for (; t; t = TREE_CHAIN (t)) |
1474 | { | |
1475 | register tree type = TREE_VALUE (t); | |
1476 | ||
5fe86b8b RS |
1477 | if (TREE_CHAIN (t) == 0 |
1478 | && TYPE_MAIN_VARIANT (type) != void_type_node) | |
51e29401 RS |
1479 | { |
1480 | error ("A parameter list with an ellipsis can't match"); | |
1481 | error ("an empty parameter name list declaration."); | |
1482 | break; | |
1483 | } | |
1484 | ||
90d56da8 | 1485 | if (TYPE_MAIN_VARIANT (type) == float_type_node |
24bc4c7f | 1486 | || C_PROMOTING_INTEGER_TYPE_P (type)) |
51e29401 RS |
1487 | { |
1488 | error ("An argument type that has a default promotion"); | |
1489 | error ("can't match an empty parameter name list declaration."); | |
1490 | break; | |
1491 | } | |
1492 | } | |
1493 | } | |
1494 | error_with_decl (olddecl, "previous declaration of `%s'"); | |
1495 | } | |
1496 | else | |
1497 | { | |
1498 | char *errmsg = redeclaration_error_message (newdecl, olddecl); | |
1499 | if (errmsg) | |
1500 | { | |
1501 | error_with_decl (newdecl, errmsg); | |
1502 | error_with_decl (olddecl, | |
d847e6a7 RS |
1503 | ((DECL_INITIAL (olddecl) |
1504 | && current_binding_level == global_binding_level) | |
1505 | ? "`%s' previously defined here" | |
1506 | : "`%s' previously declared here")); | |
51e29401 RS |
1507 | } |
1508 | else if (TREE_CODE (olddecl) == FUNCTION_DECL | |
1509 | && DECL_INITIAL (olddecl) != 0 | |
664b4b1e RS |
1510 | && TYPE_ARG_TYPES (oldtype) == 0 |
1511 | && TYPE_ARG_TYPES (newtype) != 0) | |
51e29401 RS |
1512 | { |
1513 | register tree type, parm; | |
1514 | register int nargs; | |
1515 | /* Prototype decl follows defn w/o prototype. */ | |
1516 | ||
664b4b1e RS |
1517 | for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype), |
1518 | type = TYPE_ARG_TYPES (newtype), | |
51e29401 | 1519 | nargs = 1; |
5fe86b8b RS |
1520 | (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node |
1521 | || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node); | |
51e29401 RS |
1522 | parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++) |
1523 | { | |
5fe86b8b RS |
1524 | if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node |
1525 | || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node) | |
51e29401 RS |
1526 | { |
1527 | errmsg = "prototype for `%s' follows and number of arguments"; | |
1528 | break; | |
1529 | } | |
1530 | /* Type for passing arg must be consistent | |
1531 | with that declared for the arg. */ | |
1532 | if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type)) | |
1533 | /* If -traditional, allow `unsigned int' instead of `int' | |
1534 | in the prototype. */ | |
1535 | && (! (flag_traditional | |
90d56da8 RS |
1536 | && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node |
1537 | && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))) | |
51e29401 RS |
1538 | { |
1539 | errmsg = "prototype for `%s' follows and argument %d"; | |
1540 | break; | |
1541 | } | |
1542 | } | |
1543 | if (errmsg) | |
1544 | { | |
1545 | error_with_decl (newdecl, errmsg, nargs); | |
1546 | error_with_decl (olddecl, | |
1547 | "doesn't match non-prototype definition here"); | |
1548 | } | |
1549 | else | |
1550 | { | |
1551 | warning_with_decl (newdecl, "prototype for `%s' follows"); | |
1552 | warning_with_decl (olddecl, "non-prototype definition here"); | |
1553 | } | |
1554 | } | |
8eebb258 | 1555 | /* Warn about mismatches in various flags. */ |
51e29401 RS |
1556 | else |
1557 | { | |
8eebb258 RS |
1558 | /* Warn if function is now inline |
1559 | but was previously declared not inline and has been called. */ | |
51e29401 | 1560 | if (TREE_CODE (olddecl) == FUNCTION_DECL |
1394aabd | 1561 | && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl) |
51e29401 RS |
1562 | && TREE_USED (olddecl)) |
1563 | warning_with_decl (newdecl, | |
1564 | "`%s' declared inline after being called"); | |
1565 | if (TREE_CODE (olddecl) == FUNCTION_DECL | |
1394aabd | 1566 | && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl) |
960a2eb1 | 1567 | && DECL_INITIAL (olddecl) != 0) |
51e29401 | 1568 | warning_with_decl (newdecl, |
960a2eb1 | 1569 | "`%s' declared inline after its definition"); |
51e29401 RS |
1570 | /* It is nice to warn when a function is declared |
1571 | global first and then static. */ | |
1572 | if (TREE_CODE (olddecl) == FUNCTION_DECL | |
1573 | && TREE_PUBLIC (olddecl) | |
1574 | && !TREE_PUBLIC (newdecl)) | |
1575 | warning_with_decl (newdecl, "static declaration for `%s' follows non-static"); | |
1576 | ||
8eebb258 RS |
1577 | /* These bits are logically part of the type, for variables. |
1578 | But not for functions | |
1579 | (where qualifiers are not valid ANSI anyway). */ | |
1580 | if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL | |
51e29401 RS |
1581 | && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl) |
1582 | || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl))) | |
1583 | pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl"); | |
1584 | } | |
1585 | } | |
1586 | ||
27f427f8 RS |
1587 | /* Optionally warn about more than one declaration for the same name. */ |
1588 | if (warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0 | |
1589 | /* Dont warn about a function declaration | |
1590 | followed by a definition. */ | |
1591 | && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0 | |
ec820a12 RS |
1592 | && DECL_INITIAL (olddecl) == 0) |
1593 | /* Don't warn about extern decl followed by (tentative) definition. */ | |
1594 | && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))) | |
27f427f8 RS |
1595 | { |
1596 | warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope"); | |
1597 | warning_with_decl (olddecl, "previous declaration of `%s'"); | |
1598 | } | |
1599 | ||
51e29401 | 1600 | /* Copy all the DECL_... slots specified in the new decl |
664b4b1e RS |
1601 | except for any that we copy here from the old type. |
1602 | ||
1603 | Past this point, we don't change OLDTYPE and NEWTYPE | |
1604 | even if we change the types of NEWDECL and OLDDECL. */ | |
51e29401 RS |
1605 | |
1606 | if (types_match) | |
1607 | { | |
51e29401 RS |
1608 | /* Merge the data types specified in the two decls. */ |
1609 | if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl)) | |
1610 | TREE_TYPE (newdecl) | |
1611 | = TREE_TYPE (olddecl) | |
664b4b1e | 1612 | = common_type (newtype, oldtype); |
51e29401 RS |
1613 | |
1614 | /* Lay the type out, unless already done. */ | |
1615 | if (oldtype != TREE_TYPE (newdecl)) | |
1616 | { | |
1617 | if (TREE_TYPE (newdecl) != error_mark_node) | |
1618 | layout_type (TREE_TYPE (newdecl)); | |
1619 | if (TREE_CODE (newdecl) != FUNCTION_DECL | |
1620 | && TREE_CODE (newdecl) != TYPE_DECL | |
1621 | && TREE_CODE (newdecl) != CONST_DECL) | |
1622 | layout_decl (newdecl, 0); | |
1623 | } | |
1624 | else | |
1625 | { | |
1626 | /* Since the type is OLDDECL's, make OLDDECL's size go with. */ | |
1627 | DECL_SIZE (newdecl) = DECL_SIZE (olddecl); | |
ec2343c4 MM |
1628 | if (TREE_CODE (olddecl) != FUNCTION_DECL) |
1629 | if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl)) | |
1630 | DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl); | |
51e29401 RS |
1631 | } |
1632 | ||
fc542d3c RS |
1633 | /* Keep the old rtl since we can safely use it. */ |
1634 | DECL_RTL (newdecl) = DECL_RTL (olddecl); | |
1635 | ||
51e29401 RS |
1636 | /* Merge the type qualifiers. */ |
1637 | if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl) | |
1638 | && !TREE_THIS_VOLATILE (newdecl)) | |
1639 | TREE_THIS_VOLATILE (olddecl) = 0; | |
1640 | if (TREE_READONLY (newdecl)) | |
1641 | TREE_READONLY (olddecl) = 1; | |
1642 | if (TREE_THIS_VOLATILE (newdecl)) | |
e2f6a3cf RS |
1643 | { |
1644 | TREE_THIS_VOLATILE (olddecl) = 1; | |
1645 | if (TREE_CODE (newdecl) == VAR_DECL) | |
1646 | make_var_volatile (newdecl); | |
1647 | } | |
51e29401 RS |
1648 | |
1649 | /* Keep source location of definition rather than declaration. */ | |
1650 | if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0) | |
1651 | { | |
1652 | DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl); | |
1653 | DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl); | |
1654 | } | |
1655 | ||
e2f6a3cf RS |
1656 | /* Merge the unused-warning information. */ |
1657 | if (DECL_IN_SYSTEM_HEADER (olddecl)) | |
1658 | DECL_IN_SYSTEM_HEADER (newdecl) = 1; | |
1659 | else if (DECL_IN_SYSTEM_HEADER (newdecl)) | |
1660 | DECL_IN_SYSTEM_HEADER (olddecl) = 1; | |
1661 | ||
51e29401 RS |
1662 | /* Merge the initialization information. */ |
1663 | if (DECL_INITIAL (newdecl) == 0) | |
1664 | DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl); | |
51e29401 RS |
1665 | } |
1666 | /* If cannot merge, then use the new type and qualifiers, | |
1667 | and don't preserve the old rtl. */ | |
1668 | else | |
1669 | { | |
1670 | TREE_TYPE (olddecl) = TREE_TYPE (newdecl); | |
1671 | TREE_READONLY (olddecl) = TREE_READONLY (newdecl); | |
1672 | TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl); | |
1673 | TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl); | |
1674 | } | |
1675 | ||
1676 | /* Merge the storage class information. */ | |
1677 | /* For functions, static overrides non-static. */ | |
1678 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
1679 | { | |
1680 | TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl); | |
1681 | /* This is since we don't automatically | |
1682 | copy the attributes of NEWDECL into OLDDECL. */ | |
1683 | TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl); | |
1684 | /* If this clears `static', clear it in the identifier too. */ | |
1685 | if (! TREE_PUBLIC (olddecl)) | |
1686 | TREE_PUBLIC (DECL_NAME (olddecl)) = 0; | |
1687 | } | |
1394aabd | 1688 | if (DECL_EXTERNAL (newdecl)) |
51e29401 RS |
1689 | { |
1690 | TREE_STATIC (newdecl) = TREE_STATIC (olddecl); | |
1394aabd | 1691 | DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl); |
51e29401 RS |
1692 | /* An extern decl does not override previous storage class. */ |
1693 | TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl); | |
1694 | } | |
1695 | else | |
1696 | { | |
1697 | TREE_STATIC (olddecl) = TREE_STATIC (newdecl); | |
51e29401 RS |
1698 | TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl); |
1699 | } | |
850cba29 | 1700 | |
51e29401 RS |
1701 | /* If either decl says `inline', this fn is inline, |
1702 | unless its definition was passed already. */ | |
1394aabd RS |
1703 | if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0) |
1704 | DECL_INLINE (olddecl) = 1; | |
850cba29 | 1705 | DECL_INLINE (newdecl) = DECL_INLINE (olddecl); |
51e29401 RS |
1706 | |
1707 | /* Get rid of any built-in function if new arg types don't match it | |
1708 | or if we have a function definition. */ | |
1709 | if (TREE_CODE (newdecl) == FUNCTION_DECL | |
1710 | && DECL_BUILT_IN (olddecl) | |
1711 | && (!types_match || new_is_definition)) | |
1712 | { | |
1713 | TREE_TYPE (olddecl) = TREE_TYPE (newdecl); | |
1714 | DECL_BUILT_IN (olddecl) = 0; | |
1715 | } | |
1716 | ||
1717 | /* If redeclaring a builtin function, and not a definition, | |
1718 | it stays built in. | |
1719 | Also preserve various other info from the definition. */ | |
1720 | if (TREE_CODE (newdecl) == FUNCTION_DECL && !new_is_definition) | |
1721 | { | |
1722 | if (DECL_BUILT_IN (olddecl)) | |
1723 | { | |
1724 | DECL_BUILT_IN (newdecl) = 1; | |
1725 | DECL_SET_FUNCTION_CODE (newdecl, DECL_FUNCTION_CODE (olddecl)); | |
1726 | } | |
1727 | else | |
1728 | DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl); | |
1729 | ||
1730 | DECL_RESULT (newdecl) = DECL_RESULT (olddecl); | |
1731 | DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl); | |
1732 | DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl); | |
1733 | DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl); | |
1734 | } | |
1735 | ||
850cba29 RS |
1736 | /* Copy most of the decl-specific fields of NEWDECL into OLDDECL. |
1737 | But preserve OLDdECL's DECL_UID. */ | |
1738 | { | |
1739 | register unsigned olddecl_uid = DECL_UID (olddecl); | |
1740 | ||
1741 | bcopy ((char *) newdecl + sizeof (struct tree_common), | |
1742 | (char *) olddecl + sizeof (struct tree_common), | |
1743 | sizeof (struct tree_decl) - sizeof (struct tree_common)); | |
1744 | DECL_UID (olddecl) = olddecl_uid; | |
1745 | } | |
51e29401 RS |
1746 | |
1747 | return 1; | |
1748 | } | |
1749 | ||
1750 | /* Record a decl-node X as belonging to the current lexical scope. | |
1751 | Check for errors (such as an incompatible declaration for the same | |
1752 | name already seen in the same scope). | |
1753 | ||
1754 | Returns either X or an old decl for the same name. | |
1755 | If an old decl is returned, it may have been smashed | |
1756 | to agree with what X says. */ | |
1757 | ||
1758 | tree | |
1759 | pushdecl (x) | |
1760 | tree x; | |
1761 | { | |
1762 | register tree t; | |
1763 | register tree name = DECL_NAME (x); | |
1764 | register struct binding_level *b = current_binding_level; | |
1765 | ||
1766 | DECL_CONTEXT (x) = current_function_decl; | |
89d7540d RS |
1767 | /* A local extern declaration for a function doesn't constitute nesting. |
1768 | A local auto declaration does, since it's a forward decl | |
1769 | for a nested function coming later. */ | |
1770 | if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0 | |
1771 | && DECL_EXTERNAL (x)) | |
51e29401 RS |
1772 | DECL_CONTEXT (x) = 0; |
1773 | ||
1394aabd | 1774 | if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level |
51e29401 RS |
1775 | && x != IDENTIFIER_IMPLICIT_DECL (name)) |
1776 | warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name)); | |
1777 | ||
1778 | if (name) | |
1779 | { | |
1780 | char *file; | |
1781 | int line; | |
1782 | ||
1783 | t = lookup_name_current_level (name); | |
1784 | if (t != 0 && t == error_mark_node) | |
1785 | /* error_mark_node is 0 for a while during initialization! */ | |
1786 | { | |
1787 | t = 0; | |
1788 | error_with_decl (x, "`%s' used prior to declaration"); | |
1789 | } | |
1790 | ||
1791 | if (t != 0) | |
1792 | { | |
1793 | file = DECL_SOURCE_FILE (t); | |
1794 | line = DECL_SOURCE_LINE (t); | |
1795 | } | |
1796 | ||
1797 | if (t != 0 && duplicate_decls (x, t)) | |
1798 | { | |
1799 | if (TREE_CODE (t) == PARM_DECL) | |
1800 | { | |
1801 | /* Don't allow more than one "real" duplicate | |
1802 | of a forward parm decl. */ | |
1803 | TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x); | |
1804 | return t; | |
1805 | } | |
1806 | /* If this decl is `static' and an implicit decl was seen previously, | |
1807 | warn. But don't complain if -traditional, | |
1808 | since traditional compilers don't complain. */ | |
1809 | if (!flag_traditional && TREE_PUBLIC (name) | |
1394aabd | 1810 | && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x) |
51e29401 RS |
1811 | /* We used to warn also for explicit extern followed by static, |
1812 | but sometimes you need to do it that way. */ | |
1813 | && IDENTIFIER_IMPLICIT_DECL (name) != 0) | |
1814 | { | |
1815 | pedwarn ("`%s' was declared implicitly `extern' and later `static'", | |
1816 | IDENTIFIER_POINTER (name)); | |
1817 | pedwarn_with_file_and_line (file, line, | |
1818 | "previous declaration of `%s'", | |
1819 | IDENTIFIER_POINTER (name)); | |
1820 | } | |
27f427f8 | 1821 | |
51e29401 RS |
1822 | return t; |
1823 | } | |
1824 | ||
1ce634c3 RS |
1825 | /* If we are processing a typedef statement, generate a whole new |
1826 | ..._TYPE node (which will be just an variant of the existing | |
1827 | ..._TYPE node with identical properties) and then install the | |
1828 | TYPE_DECL node generated to represent the typedef name as the | |
1829 | TYPE_NAME of this brand new (duplicate) ..._TYPE node. | |
1830 | ||
1831 | The whole point here is to end up with a situation where each | |
1832 | and every ..._TYPE node the compiler creates will be uniquely | |
1833 | associated with AT MOST one node representing a typedef name. | |
1834 | This way, even though the compiler substitutes corresponding | |
1835 | ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very | |
1836 | early on, later parts of the compiler can always do the reverse | |
1837 | translation and get back the corresponding typedef name. For | |
1838 | example, given: | |
1839 | ||
1840 | typedef struct S MY_TYPE; | |
1841 | MY_TYPE object; | |
1842 | ||
1843 | Later parts of the compiler might only know that `object' was of | |
1844 | type `struct S' if if were not for code just below. With this | |
1845 | code however, later parts of the compiler see something like: | |
1846 | ||
1847 | struct S' == struct S | |
1848 | typedef struct S' MY_TYPE; | |
1849 | struct S' object; | |
1850 | ||
1851 | And they can then deduce (from the node for type struct S') that | |
1852 | the original object declaration was: | |
1853 | ||
1854 | MY_TYPE object; | |
1855 | ||
1856 | Being able to do this is important for proper support of protoize, | |
1857 | and also for generating precise symbolic debugging information | |
1858 | which takes full account of the programmer's (typedef) vocabulary. | |
1859 | ||
1860 | Obviously, we don't want to generate a duplicate ..._TYPE node if | |
1861 | the TYPE_DECL node that we are now processing really represents a | |
1862 | standard built-in type. | |
1863 | ||
51e29401 RS |
1864 | Since all standard types are effectively declared at line zero |
1865 | in the source file, we can easily check to see if we are working | |
1866 | on a standard type by checking the current value of lineno. */ | |
1867 | ||
1868 | if (TREE_CODE (x) == TYPE_DECL) | |
1869 | { | |
1600ec67 | 1870 | if (DECL_SOURCE_LINE (x) == 0) |
51e29401 RS |
1871 | { |
1872 | if (TYPE_NAME (TREE_TYPE (x)) == 0) | |
1873 | TYPE_NAME (TREE_TYPE (x)) = x; | |
1874 | } | |
32831d4b | 1875 | else if (TREE_TYPE (x) != error_mark_node) |
51e29401 RS |
1876 | { |
1877 | tree tt = TREE_TYPE (x); | |
1878 | ||
1ce634c3 | 1879 | tt = build_type_copy (tt); |
51e29401 RS |
1880 | TYPE_NAME (tt) = x; |
1881 | TREE_TYPE (x) = tt; | |
1882 | } | |
1883 | } | |
1884 | ||
fd0b8fce JW |
1885 | /* Multiple external decls of the same identifier ought to match. |
1886 | Check against both global declarations and out of scope (limbo) block | |
1887 | level declarations. | |
51e29401 | 1888 | |
fd0b8fce JW |
1889 | We get warnings about inline functions where they are defined. |
1890 | Avoid duplicate warnings where they are used. */ | |
030f365a | 1891 | if (TREE_PUBLIC (x) && ! DECL_INLINE (x)) |
51e29401 | 1892 | { |
fd0b8fce JW |
1893 | tree decl; |
1894 | ||
1895 | if (IDENTIFIER_GLOBAL_VALUE (name) != 0 | |
1896 | && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name)) | |
1897 | || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name)))) | |
1898 | decl = IDENTIFIER_GLOBAL_VALUE (name); | |
1899 | else if (IDENTIFIER_LIMBO_VALUE (name) != 0) | |
1900 | /* Decls in limbo are always extern, so no need to check that. */ | |
1901 | decl = IDENTIFIER_LIMBO_VALUE (name); | |
1902 | else | |
1903 | decl = 0; | |
1904 | ||
58811315 RS |
1905 | if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl)) |
1906 | /* If old decl is built-in, we already warned if we should. */ | |
1907 | && !DECL_BUILT_IN (decl)) | |
51e29401 RS |
1908 | { |
1909 | pedwarn_with_decl (x, | |
1910 | "type mismatch with previous external decl"); | |
fd0b8fce | 1911 | pedwarn_with_decl (decl, "previous external decl of `%s'"); |
51e29401 RS |
1912 | } |
1913 | } | |
1914 | ||
1915 | /* If a function has had an implicit declaration, and then is defined, | |
1916 | make sure they are compatible. */ | |
1917 | ||
1918 | if (IDENTIFIER_IMPLICIT_DECL (name) != 0 | |
1919 | && IDENTIFIER_GLOBAL_VALUE (name) == 0 | |
1920 | && TREE_CODE (x) == FUNCTION_DECL | |
1921 | && ! comptypes (TREE_TYPE (x), | |
1922 | TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name)))) | |
1923 | { | |
1924 | warning_with_decl (x, "type mismatch with previous implicit declaration"); | |
929f3671 RS |
1925 | warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name), |
1926 | "previous implicit declaration of `%s'"); | |
51e29401 RS |
1927 | } |
1928 | ||
1929 | /* In PCC-compatibility mode, extern decls of vars with no current decl | |
1930 | take effect at top level no matter where they are. */ | |
1394aabd | 1931 | if (flag_traditional && DECL_EXTERNAL (x) |
51e29401 RS |
1932 | && lookup_name (name) == 0) |
1933 | { | |
1934 | tree type = TREE_TYPE (x); | |
1935 | ||
1936 | /* But don't do this if the type contains temporary nodes. */ | |
1937 | while (type) | |
1938 | { | |
1939 | if (type == error_mark_node) | |
1940 | break; | |
1941 | if (! TREE_PERMANENT (type)) | |
1942 | { | |
1943 | warning_with_decl (x, "type of external `%s' is not global"); | |
1944 | /* By exiting the loop early, we leave TYPE nonzero, | |
1945 | and thus prevent globalization of the decl. */ | |
1946 | break; | |
1947 | } | |
1948 | else if (TREE_CODE (type) == FUNCTION_TYPE | |
1949 | && TYPE_ARG_TYPES (type) != 0) | |
1950 | /* The types might not be truly local, | |
1951 | but the list of arg types certainly is temporary. | |
1952 | Since prototypes are nontraditional, | |
1953 | ok not to do the traditional thing. */ | |
1954 | break; | |
1955 | type = TREE_TYPE (type); | |
1956 | } | |
1957 | ||
1958 | if (type == 0) | |
1959 | b = global_binding_level; | |
1960 | } | |
1961 | ||
1962 | /* This name is new in its binding level. | |
1963 | Install the new declaration and return it. */ | |
1964 | if (b == global_binding_level) | |
1965 | { | |
1966 | /* Install a global value. */ | |
1967 | ||
1968 | /* If the first global decl has external linkage, | |
1969 | warn if we later see static one. */ | |
1970 | if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x)) | |
1971 | TREE_PUBLIC (name) = 1; | |
1972 | ||
1973 | IDENTIFIER_GLOBAL_VALUE (name) = x; | |
1974 | ||
fd0b8fce JW |
1975 | /* We no longer care about any previous block level declarations. */ |
1976 | IDENTIFIER_LIMBO_VALUE (name) = 0; | |
1977 | ||
51e29401 RS |
1978 | /* Don't forget if the function was used via an implicit decl. */ |
1979 | if (IDENTIFIER_IMPLICIT_DECL (name) | |
1980 | && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name))) | |
1981 | TREE_USED (x) = 1, TREE_USED (name) = 1; | |
1982 | ||
1983 | /* Don't forget if its address was taken in that way. */ | |
1984 | if (IDENTIFIER_IMPLICIT_DECL (name) | |
1985 | && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name))) | |
1986 | TREE_ADDRESSABLE (x) = 1; | |
1987 | ||
1988 | /* Warn about mismatches against previous implicit decl. */ | |
1989 | if (IDENTIFIER_IMPLICIT_DECL (name) != 0 | |
1990 | /* If this real decl matches the implicit, don't complain. */ | |
1991 | && ! (TREE_CODE (x) == FUNCTION_DECL | |
90d56da8 RS |
1992 | && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x))) |
1993 | == integer_type_node))) | |
51e29401 RS |
1994 | pedwarn ("`%s' was previously implicitly declared to return `int'", |
1995 | IDENTIFIER_POINTER (name)); | |
1996 | ||
1997 | /* If this decl is `static' and an `extern' was seen previously, | |
1998 | that is erroneous. */ | |
1999 | if (TREE_PUBLIC (name) | |
1394aabd | 2000 | && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x)) |
51e29401 | 2001 | { |
b0e919de RS |
2002 | /* Okay to redeclare an ANSI built-in as static. */ |
2003 | if (t != 0 && DECL_BUILT_IN (t)) | |
929f3671 RS |
2004 | ; |
2005 | /* Okay to declare a non-ANSI built-in as anything. */ | |
2006 | else if (t != 0 && DECL_BUILT_IN_NONANSI (t)) | |
2007 | ; | |
2008 | else if (IDENTIFIER_IMPLICIT_DECL (name)) | |
51e29401 RS |
2009 | pedwarn ("`%s' was declared implicitly `extern' and later `static'", |
2010 | IDENTIFIER_POINTER (name)); | |
2011 | else | |
2012 | pedwarn ("`%s' was declared `extern' and later `static'", | |
2013 | IDENTIFIER_POINTER (name)); | |
2014 | } | |
2015 | } | |
2016 | else | |
2017 | { | |
2018 | /* Here to install a non-global value. */ | |
2019 | tree oldlocal = IDENTIFIER_LOCAL_VALUE (name); | |
2020 | tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name); | |
2021 | IDENTIFIER_LOCAL_VALUE (name) = x; | |
2022 | ||
2023 | /* If this is an extern function declaration, see if we | |
fc542d3c | 2024 | have a global definition or declaration for the function. */ |
51e29401 | 2025 | if (oldlocal == 0 |
1394aabd | 2026 | && DECL_EXTERNAL (x) && !DECL_INLINE (x) |
51e29401 RS |
2027 | && oldglobal != 0 |
2028 | && TREE_CODE (x) == FUNCTION_DECL | |
2029 | && TREE_CODE (oldglobal) == FUNCTION_DECL) | |
2030 | { | |
2031 | /* We have one. Their types must agree. */ | |
2032 | if (! comptypes (TREE_TYPE (x), | |
2033 | TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name)))) | |
fc542d3c RS |
2034 | pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one"); |
2035 | else | |
2036 | { | |
2037 | /* Inner extern decl is inline if global one is. | |
2038 | Copy enough to really inline it. */ | |
2039 | if (DECL_INLINE (oldglobal)) | |
2040 | { | |
2041 | DECL_INLINE (x) = DECL_INLINE (oldglobal); | |
4135e766 RS |
2042 | DECL_INITIAL (x) = (current_function_decl == oldglobal |
2043 | ? 0 : DECL_INITIAL (oldglobal)); | |
fc542d3c | 2044 | DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal); |
a2469305 | 2045 | DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal); |
fc542d3c | 2046 | DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal); |
42dfa47f RS |
2047 | DECL_RESULT (x) = DECL_RESULT (oldglobal); |
2048 | TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal); | |
2049 | DECL_ABSTRACT_ORIGIN (x) = oldglobal; | |
fc542d3c RS |
2050 | } |
2051 | /* Inner extern decl is built-in if global one is. */ | |
2052 | if (DECL_BUILT_IN (oldglobal)) | |
2053 | { | |
2054 | DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal); | |
2055 | DECL_SET_FUNCTION_CODE (x, DECL_FUNCTION_CODE (oldglobal)); | |
2056 | } | |
2057 | /* Keep the arg types from a file-scope fcn defn. */ | |
2058 | if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0 | |
2059 | && DECL_INITIAL (oldglobal) | |
2060 | && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0) | |
2061 | TREE_TYPE (x) = TREE_TYPE (oldglobal); | |
2062 | } | |
51e29401 RS |
2063 | } |
2064 | ||
2065 | #if 0 /* This case is probably sometimes the right thing to do. */ | |
2066 | /* If we have a local external declaration, | |
2067 | then any file-scope declaration should not | |
2068 | have been static. */ | |
2069 | if (oldlocal == 0 && oldglobal != 0 | |
2070 | && !TREE_PUBLIC (oldglobal) | |
1394aabd | 2071 | && DECL_EXTERNAL (x) && TREE_PUBLIC (x)) |
51e29401 RS |
2072 | warning ("`%s' locally external but globally static", |
2073 | IDENTIFIER_POINTER (name)); | |
2074 | #endif | |
2075 | ||
2076 | /* If we have a local external declaration, | |
2077 | and no file-scope declaration has yet been seen, | |
2078 | then if we later have a file-scope decl it must not be static. */ | |
2079 | if (oldlocal == 0 | |
2080 | && oldglobal == 0 | |
1394aabd | 2081 | && DECL_EXTERNAL (x) |
51e29401 RS |
2082 | && TREE_PUBLIC (x)) |
2083 | { | |
2084 | TREE_PUBLIC (name) = 1; | |
fd0b8fce JW |
2085 | |
2086 | /* Save this decl, so that we can do type checking against | |
2087 | other decls after it falls out of scope. | |
2088 | ||
2089 | Only save it once. This prevents temporary decls created in | |
2090 | expand_inline_function from being used here, since this | |
2091 | will have been set when the inline function was parsed. | |
2092 | It also helps give slightly better warnings. */ | |
2093 | if (IDENTIFIER_LIMBO_VALUE (name) == 0) | |
2094 | IDENTIFIER_LIMBO_VALUE (name) = x; | |
51e29401 RS |
2095 | } |
2096 | ||
2097 | /* Warn if shadowing an argument at the top level of the body. */ | |
1394aabd | 2098 | if (oldlocal != 0 && !DECL_EXTERNAL (x) |
51e29401 RS |
2099 | /* This warning doesn't apply to the parms of a nested fcn. */ |
2100 | && ! current_binding_level->parm_flag | |
2101 | /* Check that this is one level down from the parms. */ | |
2102 | && current_binding_level->level_chain->parm_flag | |
2103 | /* Check that the decl being shadowed | |
2104 | comes from the parm level, one level up. */ | |
2105 | && chain_member (oldlocal, current_binding_level->level_chain->names)) | |
2106 | { | |
2107 | if (TREE_CODE (oldlocal) == PARM_DECL) | |
2108 | pedwarn ("declaration of `%s' shadows a parameter", | |
2109 | IDENTIFIER_POINTER (name)); | |
2110 | else | |
2111 | pedwarn ("declaration of `%s' shadows a symbol from the parameter list", | |
2112 | IDENTIFIER_POINTER (name)); | |
2113 | } | |
2114 | ||
2115 | /* Maybe warn if shadowing something else. */ | |
1394aabd | 2116 | else if (warn_shadow && !DECL_EXTERNAL (x) |
2bae939e | 2117 | /* No shadow warnings for internally generated vars. */ |
7a0347ff | 2118 | && DECL_SOURCE_LINE (x) != 0 |
51e29401 | 2119 | /* No shadow warnings for vars made for inlining. */ |
b032c74c | 2120 | && ! DECL_FROM_INLINE (x)) |
51e29401 RS |
2121 | { |
2122 | char *warnstring = 0; | |
2123 | ||
2124 | if (TREE_CODE (x) == PARM_DECL | |
89d7540d RS |
2125 | && current_binding_level->level_chain->parm_flag) |
2126 | /* Don't warn about the parm names in function declarator | |
2127 | within a function declarator. | |
2128 | It would be nice to avoid warning in any function | |
2129 | declarator in a declaration, as opposed to a definition, | |
2130 | but there is no way to tell it's not a definition. */ | |
51e29401 RS |
2131 | ; |
2132 | else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL) | |
2133 | warnstring = "declaration of `%s' shadows a parameter"; | |
2134 | else if (oldlocal != 0) | |
2135 | warnstring = "declaration of `%s' shadows previous local"; | |
2136 | else if (IDENTIFIER_GLOBAL_VALUE (name) != 0 | |
2137 | && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node) | |
2138 | warnstring = "declaration of `%s' shadows global declaration"; | |
2139 | ||
2140 | if (warnstring) | |
2141 | warning (warnstring, IDENTIFIER_POINTER (name)); | |
2142 | } | |
2143 | ||
2144 | /* If storing a local value, there may already be one (inherited). | |
2145 | If so, record it for restoration when this binding level ends. */ | |
2146 | if (oldlocal != 0) | |
2147 | b->shadowed = tree_cons (name, oldlocal, b->shadowed); | |
2148 | } | |
2149 | ||
2150 | /* Keep count of variables in this level with incomplete type. */ | |
2151 | if (TYPE_SIZE (TREE_TYPE (x)) == 0) | |
2152 | ++b->n_incomplete; | |
2153 | } | |
2154 | ||
2155 | /* Put decls on list in reverse order. | |
2156 | We will reverse them later if necessary. */ | |
2157 | TREE_CHAIN (x) = b->names; | |
2158 | b->names = x; | |
2159 | ||
2160 | return x; | |
2161 | } | |
2162 | ||
2163 | /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */ | |
2164 | ||
2165 | tree | |
2166 | pushdecl_top_level (x) | |
2167 | tree x; | |
2168 | { | |
2169 | register tree t; | |
2170 | register struct binding_level *b = current_binding_level; | |
2171 | ||
2172 | current_binding_level = global_binding_level; | |
2173 | t = pushdecl (x); | |
2174 | current_binding_level = b; | |
2175 | return t; | |
2176 | } | |
2177 | \f | |
2178 | /* Generate an implicit declaration for identifier FUNCTIONID | |
2179 | as a function of type int (). Print a warning if appropriate. */ | |
2180 | ||
2181 | tree | |
2182 | implicitly_declare (functionid) | |
2183 | tree functionid; | |
2184 | { | |
2185 | register tree decl; | |
2186 | int traditional_warning = 0; | |
2187 | /* Only one "implicit declaration" warning per identifier. */ | |
2188 | int implicit_warning; | |
2189 | ||
2190 | /* Save the decl permanently so we can warn if definition follows. */ | |
2191 | push_obstacks_nochange (); | |
2192 | end_temporary_allocation (); | |
2193 | ||
2194 | /* We used to reuse an old implicit decl here, | |
2195 | but this loses with inline functions because it can clobber | |
2196 | the saved decl chains. */ | |
2197 | /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0) | |
2198 | decl = IDENTIFIER_IMPLICIT_DECL (functionid); | |
2199 | else */ | |
2200 | decl = build_decl (FUNCTION_DECL, functionid, default_function_type); | |
2201 | ||
2202 | /* Warn of implicit decl following explicit local extern decl. | |
2203 | This is probably a program designed for traditional C. */ | |
2204 | if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0) | |
2205 | traditional_warning = 1; | |
2206 | ||
2207 | /* Warn once of an implicit declaration. */ | |
2208 | implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0); | |
2209 | ||
1394aabd | 2210 | DECL_EXTERNAL (decl) = 1; |
51e29401 RS |
2211 | TREE_PUBLIC (decl) = 1; |
2212 | ||
2213 | /* Record that we have an implicit decl and this is it. */ | |
2214 | IDENTIFIER_IMPLICIT_DECL (functionid) = decl; | |
2215 | ||
2216 | /* ANSI standard says implicit declarations are in the innermost block. | |
2217 | So we record the decl in the standard fashion. | |
2218 | If flag_traditional is set, pushdecl does it top-level. */ | |
2219 | pushdecl (decl); | |
2220 | ||
2221 | /* This is a no-op in c-lang.c or something real in objc-actions.c. */ | |
2222 | maybe_objc_check_decl (decl); | |
2223 | ||
8d9bfdc5 | 2224 | rest_of_decl_compilation (decl, NULL_PTR, 0, 0); |
51e29401 RS |
2225 | |
2226 | if (warn_implicit && implicit_warning) | |
2227 | warning ("implicit declaration of function `%s'", | |
2228 | IDENTIFIER_POINTER (functionid)); | |
2229 | else if (warn_traditional && traditional_warning) | |
2230 | warning ("function `%s' was previously declared within a block", | |
2231 | IDENTIFIER_POINTER (functionid)); | |
2232 | ||
2233 | /* Write a record describing this implicit function declaration to the | |
2234 | prototypes file (if requested). */ | |
2235 | ||
2236 | gen_aux_info_record (decl, 0, 1, 0); | |
2237 | ||
2238 | pop_obstacks (); | |
2239 | ||
2240 | return decl; | |
2241 | } | |
2242 | ||
2243 | /* Return zero if the declaration NEWDECL is valid | |
2244 | when the declaration OLDDECL (assumed to be for the same name) | |
2245 | has already been seen. | |
2246 | Otherwise return an error message format string with a %s | |
2247 | where the identifier should go. */ | |
2248 | ||
2249 | static char * | |
2250 | redeclaration_error_message (newdecl, olddecl) | |
2251 | tree newdecl, olddecl; | |
2252 | { | |
2253 | if (TREE_CODE (newdecl) == TYPE_DECL) | |
2254 | { | |
2255 | if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl)) | |
2256 | return 0; | |
2257 | return "redefinition of `%s'"; | |
2258 | } | |
2259 | else if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2260 | { | |
2261 | /* Declarations of functions can insist on internal linkage | |
2262 | but they can't be inconsistent with internal linkage, | |
2263 | so there can be no error on that account. | |
2264 | However defining the same name twice is no good. */ | |
2265 | if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0 | |
2266 | /* However, defining once as extern inline and a second | |
2267 | time in another way is ok. */ | |
1394aabd RS |
2268 | && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl) |
2269 | && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl)))) | |
51e29401 RS |
2270 | return "redefinition of `%s'"; |
2271 | return 0; | |
2272 | } | |
2273 | else if (current_binding_level == global_binding_level) | |
2274 | { | |
2275 | /* Objects declared at top level: */ | |
2276 | /* If at least one is a reference, it's ok. */ | |
1394aabd | 2277 | if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl)) |
51e29401 RS |
2278 | return 0; |
2279 | /* Reject two definitions. */ | |
2280 | if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0) | |
2281 | return "redefinition of `%s'"; | |
2282 | /* Now we have two tentative defs, or one tentative and one real def. */ | |
2283 | /* Insist that the linkage match. */ | |
2284 | if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl)) | |
2285 | return "conflicting declarations of `%s'"; | |
2286 | return 0; | |
2287 | } | |
2288 | else if (current_binding_level->parm_flag | |
2289 | && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)) | |
2290 | return 0; | |
2291 | else | |
2292 | { | |
2293 | /* Objects declared with block scope: */ | |
2294 | /* Reject two definitions, and reject a definition | |
2295 | together with an external reference. */ | |
1394aabd | 2296 | if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))) |
51e29401 RS |
2297 | return "redeclaration of `%s'"; |
2298 | return 0; | |
2299 | } | |
2300 | } | |
2301 | \f | |
2302 | /* Get the LABEL_DECL corresponding to identifier ID as a label. | |
2303 | Create one if none exists so far for the current function. | |
2304 | This function is called for both label definitions and label references. */ | |
2305 | ||
2306 | tree | |
2307 | lookup_label (id) | |
2308 | tree id; | |
2309 | { | |
2310 | register tree decl = IDENTIFIER_LABEL_VALUE (id); | |
2311 | ||
7d9795e5 RS |
2312 | if (current_function_decl == 0) |
2313 | { | |
2314 | error ("label %s referenced outside of any function", | |
2315 | IDENTIFIER_POINTER (id)); | |
2316 | return 0; | |
2317 | } | |
2318 | ||
51e29401 RS |
2319 | /* Use a label already defined or ref'd with this name. */ |
2320 | if (decl != 0) | |
2321 | { | |
2322 | /* But not if it is inherited and wasn't declared to be inheritable. */ | |
2323 | if (DECL_CONTEXT (decl) != current_function_decl | |
2324 | && ! C_DECLARED_LABEL_FLAG (decl)) | |
2325 | return shadow_label (id); | |
2326 | return decl; | |
2327 | } | |
2328 | ||
2329 | decl = build_decl (LABEL_DECL, id, void_type_node); | |
2330 | ||
8fcd361e RS |
2331 | /* Make sure every label has an rtx. */ |
2332 | label_rtx (decl); | |
2333 | ||
51e29401 RS |
2334 | /* A label not explicitly declared must be local to where it's ref'd. */ |
2335 | DECL_CONTEXT (decl) = current_function_decl; | |
2336 | ||
2337 | DECL_MODE (decl) = VOIDmode; | |
2338 | ||
2339 | /* Say where one reference is to the label, | |
2340 | for the sake of the error if it is not defined. */ | |
2341 | DECL_SOURCE_LINE (decl) = lineno; | |
2342 | DECL_SOURCE_FILE (decl) = input_filename; | |
2343 | ||
2344 | IDENTIFIER_LABEL_VALUE (id) = decl; | |
2345 | ||
2346 | named_labels = tree_cons (NULL_TREE, decl, named_labels); | |
2347 | ||
2348 | return decl; | |
2349 | } | |
2350 | ||
2351 | /* Make a label named NAME in the current function, | |
2352 | shadowing silently any that may be inherited from containing functions | |
2353 | or containing scopes. | |
2354 | ||
2355 | Note that valid use, if the label being shadowed | |
2356 | comes from another scope in the same function, | |
2357 | requires calling declare_nonlocal_label right away. */ | |
2358 | ||
2359 | tree | |
2360 | shadow_label (name) | |
2361 | tree name; | |
2362 | { | |
2363 | register tree decl = IDENTIFIER_LABEL_VALUE (name); | |
2364 | ||
2365 | if (decl != 0) | |
2366 | { | |
2367 | shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels); | |
2368 | IDENTIFIER_LABEL_VALUE (name) = decl = 0; | |
2369 | } | |
2370 | ||
2371 | return lookup_label (name); | |
2372 | } | |
2373 | ||
2374 | /* Define a label, specifying the location in the source file. | |
2375 | Return the LABEL_DECL node for the label, if the definition is valid. | |
2376 | Otherwise return 0. */ | |
2377 | ||
2378 | tree | |
2379 | define_label (filename, line, name) | |
2380 | char *filename; | |
2381 | int line; | |
2382 | tree name; | |
2383 | { | |
2384 | tree decl = lookup_label (name); | |
2385 | ||
2386 | /* If label with this name is known from an outer context, shadow it. */ | |
2387 | if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl) | |
2388 | { | |
2389 | shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels); | |
2390 | IDENTIFIER_LABEL_VALUE (name) = 0; | |
2391 | decl = lookup_label (name); | |
2392 | } | |
2393 | ||
2394 | if (DECL_INITIAL (decl) != 0) | |
2395 | { | |
db2e669b | 2396 | error ("duplicate label `%s'", IDENTIFIER_POINTER (name)); |
51e29401 RS |
2397 | return 0; |
2398 | } | |
2399 | else | |
2400 | { | |
2401 | /* Mark label as having been defined. */ | |
2402 | DECL_INITIAL (decl) = error_mark_node; | |
2403 | /* Say where in the source. */ | |
2404 | DECL_SOURCE_FILE (decl) = filename; | |
2405 | DECL_SOURCE_LINE (decl) = line; | |
2406 | return decl; | |
2407 | } | |
2408 | } | |
2409 | \f | |
2410 | /* Return the list of declarations of the current level. | |
2411 | Note that this list is in reverse order unless/until | |
2412 | you nreverse it; and when you do nreverse it, you must | |
2413 | store the result back using `storedecls' or you will lose. */ | |
2414 | ||
2415 | tree | |
2416 | getdecls () | |
2417 | { | |
2418 | return current_binding_level->names; | |
2419 | } | |
2420 | ||
2421 | /* Return the list of type-tags (for structs, etc) of the current level. */ | |
2422 | ||
2423 | tree | |
2424 | gettags () | |
2425 | { | |
2426 | return current_binding_level->tags; | |
2427 | } | |
2428 | ||
2429 | /* Store the list of declarations of the current level. | |
2430 | This is done for the parameter declarations of a function being defined, | |
2431 | after they are modified in the light of any missing parameters. */ | |
2432 | ||
2433 | static void | |
2434 | storedecls (decls) | |
2435 | tree decls; | |
2436 | { | |
2437 | current_binding_level->names = decls; | |
2438 | } | |
2439 | ||
2440 | /* Similarly, store the list of tags of the current level. */ | |
2441 | ||
2442 | static void | |
2443 | storetags (tags) | |
2444 | tree tags; | |
2445 | { | |
2446 | current_binding_level->tags = tags; | |
2447 | } | |
2448 | \f | |
2449 | /* Given NAME, an IDENTIFIER_NODE, | |
2450 | return the structure (or union or enum) definition for that name. | |
2451 | Searches binding levels from BINDING_LEVEL up to the global level. | |
2452 | If THISLEVEL_ONLY is nonzero, searches only the specified context | |
2453 | (but skips any tag-transparent contexts to find one that is | |
2454 | meaningful for tags). | |
2455 | CODE says which kind of type the caller wants; | |
2456 | it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE. | |
2457 | If the wrong kind of type is found, an error is reported. */ | |
2458 | ||
2459 | static tree | |
2460 | lookup_tag (code, name, binding_level, thislevel_only) | |
2461 | enum tree_code code; | |
2462 | struct binding_level *binding_level; | |
2463 | tree name; | |
2464 | int thislevel_only; | |
2465 | { | |
2466 | register struct binding_level *level; | |
2467 | ||
2468 | for (level = binding_level; level; level = level->level_chain) | |
2469 | { | |
2470 | register tree tail; | |
2471 | for (tail = level->tags; tail; tail = TREE_CHAIN (tail)) | |
2472 | { | |
2473 | if (TREE_PURPOSE (tail) == name) | |
2474 | { | |
2475 | if (TREE_CODE (TREE_VALUE (tail)) != code) | |
2476 | { | |
2477 | /* Definition isn't the kind we were looking for. */ | |
2478 | pending_invalid_xref = name; | |
2479 | pending_invalid_xref_file = input_filename; | |
2480 | pending_invalid_xref_line = lineno; | |
2481 | } | |
2482 | return TREE_VALUE (tail); | |
2483 | } | |
2484 | } | |
2485 | if (thislevel_only && ! level->tag_transparent) | |
2486 | return NULL_TREE; | |
2487 | } | |
2488 | return NULL_TREE; | |
2489 | } | |
2490 | ||
2491 | /* Print an error message now | |
2492 | for a recent invalid struct, union or enum cross reference. | |
2493 | We don't print them immediately because they are not invalid | |
2494 | when used in the `struct foo;' construct for shadowing. */ | |
2495 | ||
2496 | void | |
2497 | pending_xref_error () | |
2498 | { | |
2499 | if (pending_invalid_xref != 0) | |
2500 | error_with_file_and_line (pending_invalid_xref_file, | |
2501 | pending_invalid_xref_line, | |
2502 | "`%s' defined as wrong kind of tag", | |
2503 | IDENTIFIER_POINTER (pending_invalid_xref)); | |
2504 | pending_invalid_xref = 0; | |
2505 | } | |
2506 | ||
2507 | /* Given a type, find the tag that was defined for it and return the tag name. | |
2508 | Otherwise return 0. */ | |
2509 | ||
2510 | static tree | |
2511 | lookup_tag_reverse (type) | |
2512 | tree type; | |
2513 | { | |
2514 | register struct binding_level *level; | |
2515 | ||
2516 | for (level = current_binding_level; level; level = level->level_chain) | |
2517 | { | |
2518 | register tree tail; | |
2519 | for (tail = level->tags; tail; tail = TREE_CHAIN (tail)) | |
2520 | { | |
2521 | if (TREE_VALUE (tail) == type) | |
2522 | return TREE_PURPOSE (tail); | |
2523 | } | |
2524 | } | |
2525 | return NULL_TREE; | |
2526 | } | |
2527 | \f | |
2528 | /* Look up NAME in the current binding level and its superiors | |
2529 | in the namespace of variables, functions and typedefs. | |
2530 | Return a ..._DECL node of some kind representing its definition, | |
2531 | or return 0 if it is undefined. */ | |
2532 | ||
2533 | tree | |
2534 | lookup_name (name) | |
2535 | tree name; | |
2536 | { | |
2537 | register tree val; | |
2538 | if (current_binding_level != global_binding_level | |
2539 | && IDENTIFIER_LOCAL_VALUE (name)) | |
2540 | val = IDENTIFIER_LOCAL_VALUE (name); | |
2541 | else | |
2542 | val = IDENTIFIER_GLOBAL_VALUE (name); | |
2543 | return val; | |
2544 | } | |
2545 | ||
2546 | /* Similar to `lookup_name' but look only at current binding level. */ | |
2547 | ||
f062da04 | 2548 | tree |
51e29401 RS |
2549 | lookup_name_current_level (name) |
2550 | tree name; | |
2551 | { | |
2552 | register tree t; | |
2553 | ||
2554 | if (current_binding_level == global_binding_level) | |
2555 | return IDENTIFIER_GLOBAL_VALUE (name); | |
2556 | ||
2557 | if (IDENTIFIER_LOCAL_VALUE (name) == 0) | |
2558 | return 0; | |
2559 | ||
2560 | for (t = current_binding_level->names; t; t = TREE_CHAIN (t)) | |
2561 | if (DECL_NAME (t) == name) | |
2562 | break; | |
2563 | ||
2564 | return t; | |
2565 | } | |
2566 | \f | |
2567 | /* Create the predefined scalar types of C, | |
2568 | and some nodes representing standard constants (0, 1, (void *)0). | |
2569 | Initialize the global binding level. | |
2570 | Make definitions for built-in primitive functions. */ | |
2571 | ||
2572 | void | |
2573 | init_decl_processing () | |
2574 | { | |
2575 | register tree endlink; | |
2576 | /* Either char* or void*. */ | |
2577 | tree traditional_ptr_type_node; | |
f0a45d37 RS |
2578 | /* Data types of memcpy and strlen. */ |
2579 | tree memcpy_ftype, strlen_ftype; | |
9c4614c3 | 2580 | tree void_ftype_any; |
51e29401 RS |
2581 | int wchar_type_size; |
2582 | tree temp; | |
fba9adc6 | 2583 | tree array_domain_type; |
51e29401 RS |
2584 | |
2585 | current_function_decl = NULL; | |
2586 | named_labels = NULL; | |
2587 | current_binding_level = NULL_BINDING_LEVEL; | |
2588 | free_binding_level = NULL_BINDING_LEVEL; | |
2589 | pushlevel (0); /* make the binding_level structure for global names */ | |
2590 | global_binding_level = current_binding_level; | |
2591 | ||
2592 | /* Define `int' and `char' first so that dbx will output them first. */ | |
2593 | ||
2594 | integer_type_node = make_signed_type (INT_TYPE_SIZE); | |
2595 | pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT], | |
2596 | integer_type_node)); | |
2597 | ||
2598 | /* Define `char', which is like either `signed char' or `unsigned char' | |
2599 | but not the same as either. */ | |
2600 | ||
7a0347ff RS |
2601 | char_type_node |
2602 | = (flag_signed_char | |
2603 | ? make_signed_type (CHAR_TYPE_SIZE) | |
2604 | : make_unsigned_type (CHAR_TYPE_SIZE)); | |
51e29401 RS |
2605 | pushdecl (build_decl (TYPE_DECL, get_identifier ("char"), |
2606 | char_type_node)); | |
2607 | ||
2608 | long_integer_type_node = make_signed_type (LONG_TYPE_SIZE); | |
2609 | pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"), | |
2610 | long_integer_type_node)); | |
2611 | ||
2612 | unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE); | |
2613 | pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"), | |
2614 | unsigned_type_node)); | |
2615 | ||
2616 | long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE); | |
2617 | pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"), | |
2618 | long_unsigned_type_node)); | |
2619 | ||
2620 | /* `unsigned long' is the standard type for sizeof. | |
2621 | Traditionally, use a signed type. | |
2622 | Note that stddef.h uses `unsigned long', | |
2623 | and this must agree, even of long and int are the same size. */ | |
a34731a6 RK |
2624 | sizetype |
2625 | = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))); | |
2626 | if (flag_traditional && TREE_UNSIGNED (sizetype)) | |
2627 | sizetype = signed_type (sizetype); | |
51e29401 RS |
2628 | |
2629 | ptrdiff_type_node | |
2630 | = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE))); | |
2631 | ||
2632 | TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype; | |
2633 | TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype; | |
2634 | TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype; | |
2635 | TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype; | |
2636 | TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype; | |
2637 | ||
2638 | error_mark_node = make_node (ERROR_MARK); | |
2639 | TREE_TYPE (error_mark_node) = error_mark_node; | |
2640 | ||
2641 | short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE); | |
2642 | pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"), | |
2643 | short_integer_type_node)); | |
2644 | ||
2645 | long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE); | |
2646 | pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"), | |
2647 | long_long_integer_type_node)); | |
2648 | ||
2649 | short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE); | |
2650 | pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"), | |
2651 | short_unsigned_type_node)); | |
2652 | ||
2653 | long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE); | |
2654 | pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"), | |
2655 | long_long_unsigned_type_node)); | |
2656 | ||
2657 | /* Define both `signed char' and `unsigned char'. */ | |
2658 | signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE); | |
2659 | pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"), | |
2660 | signed_char_type_node)); | |
2661 | ||
2662 | unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE); | |
2663 | pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"), | |
2664 | unsigned_char_type_node)); | |
2665 | ||
fa7d8b92 | 2666 | intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode)); |
ac4f24e7 RS |
2667 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node)); |
2668 | ||
fa7d8b92 | 2669 | intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode)); |
ac4f24e7 RS |
2670 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node)); |
2671 | ||
fa7d8b92 | 2672 | intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode)); |
ac4f24e7 RS |
2673 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node)); |
2674 | ||
fa7d8b92 | 2675 | intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode)); |
ac4f24e7 RS |
2676 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node)); |
2677 | ||
fa7d8b92 | 2678 | unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode)); |
ac4f24e7 RS |
2679 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node)); |
2680 | ||
fa7d8b92 | 2681 | unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode)); |
ac4f24e7 RS |
2682 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node)); |
2683 | ||
fa7d8b92 | 2684 | unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode)); |
ac4f24e7 RS |
2685 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node)); |
2686 | ||
fa7d8b92 | 2687 | unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode)); |
ac4f24e7 RS |
2688 | pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node)); |
2689 | ||
51e29401 RS |
2690 | float_type_node = make_node (REAL_TYPE); |
2691 | TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE; | |
2692 | pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT], | |
2693 | float_type_node)); | |
2694 | layout_type (float_type_node); | |
2695 | ||
2696 | double_type_node = make_node (REAL_TYPE); | |
2697 | if (flag_short_double) | |
2698 | TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE; | |
2699 | else | |
2700 | TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE; | |
2701 | pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE], | |
2702 | double_type_node)); | |
2703 | layout_type (double_type_node); | |
2704 | ||
2705 | long_double_type_node = make_node (REAL_TYPE); | |
2706 | TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE; | |
2707 | pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"), | |
2708 | long_double_type_node)); | |
2709 | layout_type (long_double_type_node); | |
2710 | ||
5ab10c42 RS |
2711 | complex_integer_type_node = make_node (COMPLEX_TYPE); |
2712 | pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"), | |
2713 | complex_integer_type_node)); | |
2714 | TREE_TYPE (complex_integer_type_node) = integer_type_node; | |
2715 | layout_type (complex_integer_type_node); | |
2716 | ||
2717 | complex_float_type_node = make_node (COMPLEX_TYPE); | |
2718 | pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"), | |
2719 | complex_float_type_node)); | |
2720 | TREE_TYPE (complex_float_type_node) = float_type_node; | |
2721 | layout_type (complex_float_type_node); | |
2722 | ||
2723 | complex_double_type_node = make_node (COMPLEX_TYPE); | |
2724 | pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"), | |
2725 | complex_double_type_node)); | |
2726 | TREE_TYPE (complex_double_type_node) = double_type_node; | |
2727 | layout_type (complex_double_type_node); | |
2728 | ||
2729 | complex_long_double_type_node = make_node (COMPLEX_TYPE); | |
2730 | pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"), | |
2731 | complex_long_double_type_node)); | |
2732 | TREE_TYPE (complex_long_double_type_node) = long_double_type_node; | |
2733 | layout_type (complex_long_double_type_node); | |
2734 | ||
51e29401 RS |
2735 | wchar_type_node |
2736 | = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE))); | |
2737 | wchar_type_size = TYPE_PRECISION (wchar_type_node); | |
2738 | signed_wchar_type_node = type_for_size (wchar_type_size, 0); | |
2739 | unsigned_wchar_type_node = type_for_size (wchar_type_size, 1); | |
2740 | ||
2741 | integer_zero_node = build_int_2 (0, 0); | |
2742 | TREE_TYPE (integer_zero_node) = integer_type_node; | |
2743 | integer_one_node = build_int_2 (1, 0); | |
2744 | TREE_TYPE (integer_one_node) = integer_type_node; | |
2745 | ||
2746 | size_zero_node = build_int_2 (0, 0); | |
2747 | TREE_TYPE (size_zero_node) = sizetype; | |
2748 | size_one_node = build_int_2 (1, 0); | |
2749 | TREE_TYPE (size_one_node) = sizetype; | |
2750 | ||
2751 | void_type_node = make_node (VOID_TYPE); | |
2752 | pushdecl (build_decl (TYPE_DECL, | |
2753 | ridpointers[(int) RID_VOID], void_type_node)); | |
2754 | layout_type (void_type_node); /* Uses integer_zero_node */ | |
2755 | /* We are not going to have real types in C with less than byte alignment, | |
2756 | so we might as well not have any types that claim to have it. */ | |
2757 | TYPE_ALIGN (void_type_node) = BITS_PER_UNIT; | |
2758 | ||
2759 | null_pointer_node = build_int_2 (0, 0); | |
2760 | TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node); | |
2761 | layout_type (TREE_TYPE (null_pointer_node)); | |
2762 | ||
2763 | string_type_node = build_pointer_type (char_type_node); | |
2764 | const_string_type_node | |
2765 | = build_pointer_type (build_type_variant (char_type_node, 1, 0)); | |
2766 | ||
fba9adc6 | 2767 | /* Make a type to be the domain of a few array types |
c81fe25d RK |
2768 | whose domains don't really matter. |
2769 | 200 is small enough that it always fits in size_t | |
2770 | and large enough that it can hold most function names for the | |
2771 | initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */ | |
2772 | array_domain_type = build_index_type (build_int_2 (200, 0)); | |
fba9adc6 RS |
2773 | |
2774 | /* make a type for arrays of characters. | |
51e29401 RS |
2775 | With luck nothing will ever really depend on the length of this |
2776 | array type. */ | |
2777 | char_array_type_node | |
fba9adc6 | 2778 | = build_array_type (char_type_node, array_domain_type); |
51e29401 RS |
2779 | /* Likewise for arrays of ints. */ |
2780 | int_array_type_node | |
fba9adc6 | 2781 | = build_array_type (integer_type_node, array_domain_type); |
51e29401 RS |
2782 | /* This is for wide string constants. */ |
2783 | wchar_array_type_node | |
fba9adc6 | 2784 | = build_array_type (wchar_type_node, array_domain_type); |
51e29401 RS |
2785 | |
2786 | default_function_type | |
2787 | = build_function_type (integer_type_node, NULL_TREE); | |
2788 | ||
2789 | ptr_type_node = build_pointer_type (void_type_node); | |
2790 | const_ptr_type_node | |
2791 | = build_pointer_type (build_type_variant (void_type_node, 1, 0)); | |
2792 | ||
2793 | endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE); | |
2794 | ||
9c4614c3 | 2795 | void_ftype_any |
8d9bfdc5 | 2796 | = build_function_type (void_type_node, NULL_TREE); |
9c4614c3 | 2797 | |
51e29401 RS |
2798 | double_ftype_double |
2799 | = build_function_type (double_type_node, | |
2800 | tree_cons (NULL_TREE, double_type_node, endlink)); | |
2801 | ||
2802 | double_ftype_double_double | |
2803 | = build_function_type (double_type_node, | |
2804 | tree_cons (NULL_TREE, double_type_node, | |
2805 | tree_cons (NULL_TREE, | |
2806 | double_type_node, endlink))); | |
2807 | ||
2808 | int_ftype_int | |
2809 | = build_function_type (integer_type_node, | |
2810 | tree_cons (NULL_TREE, integer_type_node, endlink)); | |
2811 | ||
2812 | long_ftype_long | |
2813 | = build_function_type (long_integer_type_node, | |
2814 | tree_cons (NULL_TREE, | |
2815 | long_integer_type_node, endlink)); | |
2816 | ||
2817 | void_ftype_ptr_ptr_int | |
2818 | = build_function_type (void_type_node, | |
2819 | tree_cons (NULL_TREE, ptr_type_node, | |
2820 | tree_cons (NULL_TREE, ptr_type_node, | |
2821 | tree_cons (NULL_TREE, | |
2822 | integer_type_node, | |
2823 | endlink)))); | |
2824 | ||
2825 | int_ftype_cptr_cptr_sizet | |
2826 | = build_function_type (integer_type_node, | |
2827 | tree_cons (NULL_TREE, const_ptr_type_node, | |
2828 | tree_cons (NULL_TREE, const_ptr_type_node, | |
2829 | tree_cons (NULL_TREE, | |
2830 | sizetype, | |
2831 | endlink)))); | |
2832 | ||
2833 | void_ftype_ptr_int_int | |
2834 | = build_function_type (void_type_node, | |
2835 | tree_cons (NULL_TREE, ptr_type_node, | |
2836 | tree_cons (NULL_TREE, integer_type_node, | |
2837 | tree_cons (NULL_TREE, | |
2838 | integer_type_node, | |
2839 | endlink)))); | |
2840 | ||
2841 | string_ftype_ptr_ptr /* strcpy prototype */ | |
2842 | = build_function_type (string_type_node, | |
2843 | tree_cons (NULL_TREE, string_type_node, | |
2844 | tree_cons (NULL_TREE, | |
2845 | const_string_type_node, | |
2846 | endlink))); | |
2847 | ||
2848 | int_ftype_string_string /* strcmp prototype */ | |
2849 | = build_function_type (integer_type_node, | |
2850 | tree_cons (NULL_TREE, const_string_type_node, | |
2851 | tree_cons (NULL_TREE, | |
2852 | const_string_type_node, | |
2853 | endlink))); | |
2854 | ||
f0a45d37 RS |
2855 | strlen_ftype /* strlen prototype */ |
2856 | = build_function_type (flag_traditional ? integer_type_node : sizetype, | |
51e29401 RS |
2857 | tree_cons (NULL_TREE, const_string_type_node, |
2858 | endlink)); | |
2859 | ||
2860 | traditional_ptr_type_node | |
2861 | = (flag_traditional ? string_type_node : ptr_type_node); | |
2862 | ||
2863 | memcpy_ftype /* memcpy prototype */ | |
2864 | = build_function_type (traditional_ptr_type_node, | |
2865 | tree_cons (NULL_TREE, ptr_type_node, | |
2866 | tree_cons (NULL_TREE, const_ptr_type_node, | |
2867 | tree_cons (NULL_TREE, | |
2868 | sizetype, | |
2869 | endlink)))); | |
2870 | ||
5fe5c210 | 2871 | builtin_function ("__builtin_constant_p", int_ftype_int, |
8d9bfdc5 | 2872 | BUILT_IN_CONSTANT_P, NULL_PTR); |
51e29401 RS |
2873 | |
2874 | builtin_function ("__builtin_return_address", | |
530fb43c | 2875 | build_function_type (ptr_type_node, |
51e29401 RS |
2876 | tree_cons (NULL_TREE, |
2877 | unsigned_type_node, | |
2878 | endlink)), | |
8d9bfdc5 | 2879 | BUILT_IN_RETURN_ADDRESS, NULL_PTR); |
51e29401 RS |
2880 | |
2881 | builtin_function ("__builtin_frame_address", | |
530fb43c | 2882 | build_function_type (ptr_type_node, |
51e29401 RS |
2883 | tree_cons (NULL_TREE, |
2884 | unsigned_type_node, | |
2885 | endlink)), | |
8d9bfdc5 | 2886 | BUILT_IN_FRAME_ADDRESS, NULL_PTR); |
51e29401 RS |
2887 | |
2888 | builtin_function ("__builtin_alloca", | |
2889 | build_function_type (ptr_type_node, | |
2890 | tree_cons (NULL_TREE, | |
2891 | sizetype, | |
2892 | endlink)), | |
2893 | BUILT_IN_ALLOCA, "alloca"); | |
1f53ee05 RS |
2894 | builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR); |
2895 | /* Define alloca, ffs as builtins. | |
2896 | Declare _exit just to mark it as volatile. */ | |
fc3ffe83 | 2897 | if (! flag_no_builtin && !flag_no_nonansi_builtin) |
51e29401 | 2898 | { |
51e29401 RS |
2899 | temp = builtin_function ("alloca", |
2900 | build_function_type (ptr_type_node, | |
2901 | tree_cons (NULL_TREE, | |
2902 | sizetype, | |
2903 | endlink)), | |
8d9bfdc5 | 2904 | BUILT_IN_ALLOCA, NULL_PTR); |
51e29401 RS |
2905 | /* Suppress error if redefined as a non-function. */ |
2906 | DECL_BUILT_IN_NONANSI (temp) = 1; | |
1f53ee05 RS |
2907 | temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR); |
2908 | /* Suppress error if redefined as a non-function. */ | |
2909 | DECL_BUILT_IN_NONANSI (temp) = 1; | |
8d9bfdc5 RK |
2910 | temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN, |
2911 | NULL_PTR); | |
51e29401 RS |
2912 | TREE_THIS_VOLATILE (temp) = 1; |
2913 | TREE_SIDE_EFFECTS (temp) = 1; | |
2914 | /* Suppress error if redefined as a non-function. */ | |
2915 | DECL_BUILT_IN_NONANSI (temp) = 1; | |
2916 | } | |
2917 | ||
8d9bfdc5 RK |
2918 | builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR); |
2919 | builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS, | |
2920 | NULL_PTR); | |
2921 | builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS, | |
2922 | NULL_PTR); | |
530fb43c RK |
2923 | builtin_function ("__builtin_saveregs", |
2924 | build_function_type (ptr_type_node, NULL_TREE), | |
8d9bfdc5 | 2925 | BUILT_IN_SAVEREGS, NULL_PTR); |
51e29401 RS |
2926 | /* EXPAND_BUILTIN_VARARGS is obsolete. */ |
2927 | #if 0 | |
2928 | builtin_function ("__builtin_varargs", | |
2929 | build_function_type (ptr_type_node, | |
2930 | tree_cons (NULL_TREE, | |
2931 | integer_type_node, | |
2932 | endlink)), | |
8d9bfdc5 | 2933 | BUILT_IN_VARARGS, NULL_PTR); |
51e29401 RS |
2934 | #endif |
2935 | builtin_function ("__builtin_classify_type", default_function_type, | |
8d9bfdc5 | 2936 | BUILT_IN_CLASSIFY_TYPE, NULL_PTR); |
51e29401 RS |
2937 | builtin_function ("__builtin_next_arg", |
2938 | build_function_type (ptr_type_node, endlink), | |
8d9bfdc5 | 2939 | BUILT_IN_NEXT_ARG, NULL_PTR); |
51e29401 RS |
2940 | builtin_function ("__builtin_args_info", |
2941 | build_function_type (integer_type_node, | |
2942 | tree_cons (NULL_TREE, | |
2943 | integer_type_node, | |
2944 | endlink)), | |
8d9bfdc5 | 2945 | BUILT_IN_ARGS_INFO, NULL_PTR); |
51e29401 | 2946 | |
efb99317 TW |
2947 | /* Untyped call and return. */ |
2948 | builtin_function ("__builtin_apply_args", | |
2949 | build_function_type (ptr_type_node, NULL_TREE), | |
2950 | BUILT_IN_APPLY_ARGS, NULL_PTR); | |
2951 | ||
2952 | temp = tree_cons (NULL_TREE, | |
2953 | build_pointer_type (build_function_type (void_type_node, | |
2954 | NULL_TREE)), | |
2955 | tree_cons (NULL_TREE, | |
2956 | ptr_type_node, | |
2957 | tree_cons (NULL_TREE, | |
e09d75bd | 2958 | sizetype, |
efb99317 TW |
2959 | endlink))); |
2960 | builtin_function ("__builtin_apply", | |
2961 | build_function_type (ptr_type_node, temp), | |
2962 | BUILT_IN_APPLY, NULL_PTR); | |
2963 | builtin_function ("__builtin_return", | |
2964 | build_function_type (void_type_node, | |
2965 | tree_cons (NULL_TREE, | |
2966 | ptr_type_node, | |
2967 | endlink)), | |
2968 | BUILT_IN_RETURN, NULL_PTR); | |
2969 | ||
51e29401 RS |
2970 | /* Currently under experimentation. */ |
2971 | builtin_function ("__builtin_memcpy", memcpy_ftype, | |
2972 | BUILT_IN_MEMCPY, "memcpy"); | |
2973 | builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet, | |
2974 | BUILT_IN_MEMCMP, "memcmp"); | |
2975 | builtin_function ("__builtin_strcmp", int_ftype_string_string, | |
2976 | BUILT_IN_STRCMP, "strcmp"); | |
2977 | builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr, | |
2978 | BUILT_IN_STRCPY, "strcpy"); | |
f0a45d37 | 2979 | builtin_function ("__builtin_strlen", strlen_ftype, |
51e29401 | 2980 | BUILT_IN_STRLEN, "strlen"); |
929f3671 RS |
2981 | builtin_function ("__builtin_fsqrt", double_ftype_double, |
2982 | BUILT_IN_FSQRT, "sqrt"); | |
96a1b3af JVA |
2983 | builtin_function ("__builtin_sin", double_ftype_double, |
2984 | BUILT_IN_SIN, "sin"); | |
2985 | builtin_function ("__builtin_cos", double_ftype_double, | |
2986 | BUILT_IN_COS, "cos"); | |
2987 | ||
51e29401 RS |
2988 | /* In an ANSI C program, it is okay to supply built-in meanings |
2989 | for these functions, since applications cannot validly use them | |
2990 | with any other meaning. | |
9e3c9e1b RS |
2991 | However, honor the -fno-builtin option. */ |
2992 | if (!flag_no_builtin) | |
51e29401 | 2993 | { |
8d9bfdc5 RK |
2994 | builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR); |
2995 | builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR); | |
2996 | builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR); | |
2997 | builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR); | |
2998 | builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP, | |
2999 | NULL_PTR); | |
3000 | builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP, | |
3001 | NULL_PTR); | |
3002 | builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY, | |
3003 | NULL_PTR); | |
3004 | builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR); | |
3005 | builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR); | |
96a1b3af JVA |
3006 | builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR); |
3007 | builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR); | |
9e3c9e1b RS |
3008 | |
3009 | /* Declare these functions volatile | |
3010 | to avoid spurious "control drops through" warnings. */ | |
3011 | /* Don't specify the argument types, to avoid errors | |
3012 | from certain code which isn't valid in ANSI but which exists. */ | |
8d9bfdc5 RK |
3013 | temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN, |
3014 | NULL_PTR); | |
9e3c9e1b RS |
3015 | TREE_THIS_VOLATILE (temp) = 1; |
3016 | TREE_SIDE_EFFECTS (temp) = 1; | |
8d9bfdc5 | 3017 | temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR); |
9e3c9e1b RS |
3018 | TREE_THIS_VOLATILE (temp) = 1; |
3019 | TREE_SIDE_EFFECTS (temp) = 1; | |
51e29401 RS |
3020 | } |
3021 | ||
3022 | #if 0 | |
3023 | /* Support for these has not been written in either expand_builtin | |
3024 | or build_function_call. */ | |
8d9bfdc5 RK |
3025 | builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR); |
3026 | builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR); | |
3027 | builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR, | |
3028 | NULL_PTR); | |
3029 | builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL, | |
3030 | NULL_PTR); | |
3031 | builtin_function ("__builtin_fmod", double_ftype_double_double, | |
3032 | BUILT_IN_FMOD, NULL_PTR); | |
3033 | builtin_function ("__builtin_frem", double_ftype_double_double, | |
3034 | BUILT_IN_FREM, NULL_PTR); | |
3035 | builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int, | |
3036 | BUILT_IN_MEMSET, NULL_PTR); | |
3037 | builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP, | |
3038 | NULL_PTR); | |
3039 | builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN, | |
3040 | NULL_PTR); | |
51e29401 RS |
3041 | #endif |
3042 | ||
b032c74c | 3043 | /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */ |
7da551a2 | 3044 | declare_function_name (); |
64309441 | 3045 | |
51e29401 RS |
3046 | start_identifier_warnings (); |
3047 | ||
3048 | init_format_info_table (); | |
75621238 RS |
3049 | |
3050 | init_iterators (); | |
b4892310 RS |
3051 | |
3052 | incomplete_decl_finalize_hook = finish_incomplete_decl; | |
51e29401 RS |
3053 | } |
3054 | ||
3055 | /* Return a definition for a builtin function named NAME and whose data type | |
3056 | is TYPE. TYPE should be a function type with argument types. | |
3057 | FUNCTION_CODE tells later passes how to compile calls to this function. | |
3058 | See tree.h for its possible values. | |
3059 | ||
3060 | If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME, | |
3061 | the name to be called if we can't opencode the function. */ | |
3062 | ||
929f3671 | 3063 | tree |
51e29401 RS |
3064 | builtin_function (name, type, function_code, library_name) |
3065 | char *name; | |
3066 | tree type; | |
3067 | enum built_in_function function_code; | |
3068 | char *library_name; | |
3069 | { | |
3070 | tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type); | |
1394aabd | 3071 | DECL_EXTERNAL (decl) = 1; |
51e29401 | 3072 | TREE_PUBLIC (decl) = 1; |
9a509bfe RS |
3073 | /* If -traditional, permit redefining a builtin function any way you like. |
3074 | (Though really, if the program redefines these functions, | |
3075 | it probably won't work right unless compiled with -fno-builtin.) */ | |
3076 | if (flag_traditional && name[0] != '_') | |
3077 | DECL_BUILT_IN_NONANSI (decl) = 1; | |
51e29401 RS |
3078 | if (library_name) |
3079 | DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name); | |
8d9bfdc5 | 3080 | make_decl_rtl (decl, NULL_PTR, 1); |
51e29401 RS |
3081 | pushdecl (decl); |
3082 | if (function_code != NOT_BUILT_IN) | |
3083 | { | |
3084 | DECL_BUILT_IN (decl) = 1; | |
3085 | DECL_SET_FUNCTION_CODE (decl, function_code); | |
3086 | } | |
6b19af32 RS |
3087 | /* Warn if a function in the namespace for users |
3088 | is used without an occasion to consider it declared. */ | |
3089 | if (name[0] != '_' || name[1] != '_') | |
3090 | C_DECL_ANTICIPATED (decl) = 1; | |
51e29401 RS |
3091 | |
3092 | return decl; | |
3093 | } | |
3094 | \f | |
3095 | /* Called when a declaration is seen that contains no names to declare. | |
3096 | If its type is a reference to a structure, union or enum inherited | |
3097 | from a containing scope, shadow that tag name for the current scope | |
3098 | with a forward reference. | |
3099 | If its type defines a new named structure or union | |
3100 | or defines an enum, it is valid but we need not do anything here. | |
3101 | Otherwise, it is an error. */ | |
3102 | ||
3103 | void | |
3104 | shadow_tag (declspecs) | |
3105 | tree declspecs; | |
9282f2f9 RS |
3106 | { |
3107 | shadow_tag_warned (declspecs, 0); | |
3108 | } | |
3109 | ||
3110 | void | |
3111 | shadow_tag_warned (declspecs, warned) | |
3112 | tree declspecs; | |
3113 | int warned; | |
773edaef RK |
3114 | /* 1 => we have done a pedwarn. 2 => we have done a warning, but |
3115 | no pedwarn. */ | |
51e29401 RS |
3116 | { |
3117 | int found_tag = 0; | |
51e29401 RS |
3118 | register tree link; |
3119 | ||
3120 | pending_invalid_xref = 0; | |
3121 | ||
3122 | for (link = declspecs; link; link = TREE_CHAIN (link)) | |
3123 | { | |
3124 | register tree value = TREE_VALUE (link); | |
3125 | register enum tree_code code = TREE_CODE (value); | |
3126 | ||
3127 | if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE) | |
3128 | /* Used to test also that TYPE_SIZE (value) != 0. | |
3129 | That caused warning for `struct foo;' at top level in the file. */ | |
3130 | { | |
3131 | register tree name = lookup_tag_reverse (value); | |
3132 | register tree t; | |
3133 | ||
3134 | found_tag++; | |
3135 | ||
3136 | if (name == 0) | |
3137 | { | |
773edaef RK |
3138 | if (warned != 1 && code != ENUMERAL_TYPE) |
3139 | /* Empty unnamed enum OK */ | |
51e29401 RS |
3140 | { |
3141 | pedwarn ("unnamed struct/union that defines no instances"); | |
3142 | warned = 1; | |
3143 | } | |
3144 | } | |
3145 | else | |
3146 | { | |
3147 | t = lookup_tag (code, name, current_binding_level, 1); | |
3148 | ||
3149 | if (t == 0) | |
3150 | { | |
3151 | t = make_node (code); | |
3152 | pushtag (name, t); | |
3153 | } | |
3154 | } | |
3155 | } | |
3156 | else | |
3157 | { | |
3158 | if (!warned) | |
773edaef RK |
3159 | { |
3160 | warning ("useless keyword or type name in empty declaration"); | |
3161 | warned = 2; | |
3162 | } | |
51e29401 RS |
3163 | } |
3164 | } | |
3165 | ||
773edaef RK |
3166 | if (found_tag > 1) |
3167 | error ("two types specified in one empty declaration"); | |
3168 | ||
3169 | if (warned != 1) | |
51e29401 | 3170 | { |
51e29401 RS |
3171 | if (found_tag == 0) |
3172 | pedwarn ("empty declaration"); | |
3173 | } | |
3174 | } | |
3175 | \f | |
3176 | /* Decode a "typename", such as "int **", returning a ..._TYPE node. */ | |
3177 | ||
3178 | tree | |
3179 | groktypename (typename) | |
3180 | tree typename; | |
3181 | { | |
3182 | if (TREE_CODE (typename) != TREE_LIST) | |
3183 | return typename; | |
3184 | return grokdeclarator (TREE_VALUE (typename), | |
3185 | TREE_PURPOSE (typename), | |
3186 | TYPENAME, 0); | |
3187 | } | |
3188 | ||
3189 | /* Return a PARM_DECL node for a given pair of specs and declarator. */ | |
3190 | ||
3191 | tree | |
3192 | groktypename_in_parm_context (typename) | |
3193 | tree typename; | |
3194 | { | |
3195 | if (TREE_CODE (typename) != TREE_LIST) | |
3196 | return typename; | |
3197 | return grokdeclarator (TREE_VALUE (typename), | |
3198 | TREE_PURPOSE (typename), | |
3199 | PARM, 0); | |
3200 | } | |
3201 | ||
3202 | /* Decode a declarator in an ordinary declaration or data definition. | |
3203 | This is called as soon as the type information and variable name | |
3204 | have been parsed, before parsing the initializer if any. | |
3205 | Here we create the ..._DECL node, fill in its type, | |
3206 | and put it on the list of decls for the current context. | |
3207 | The ..._DECL node is returned as the value. | |
3208 | ||
3209 | Exception: for arrays where the length is not specified, | |
3210 | the type is left null, to be filled in by `finish_decl'. | |
3211 | ||
3212 | Function definitions do not come here; they go to start_function | |
3213 | instead. However, external and forward declarations of functions | |
3214 | do go through here. Structure field declarations are done by | |
3215 | grokfield and not through here. */ | |
3216 | ||
3217 | /* Set this to zero to debug not using the temporary obstack | |
3218 | to parse initializers. */ | |
3219 | int debug_temp_inits = 1; | |
3220 | ||
3221 | tree | |
3222 | start_decl (declarator, declspecs, initialized) | |
eaa81144 | 3223 | tree declarator, declspecs; |
51e29401 RS |
3224 | int initialized; |
3225 | { | |
3226 | register tree decl = grokdeclarator (declarator, declspecs, | |
3227 | NORMAL, initialized); | |
3228 | register tree tem; | |
3229 | int init_written = initialized; | |
3230 | ||
3231 | /* The corresponding pop_obstacks is in finish_decl. */ | |
3232 | push_obstacks_nochange (); | |
3233 | ||
3234 | if (initialized) | |
3235 | /* Is it valid for this decl to have an initializer at all? | |
3236 | If not, set INITIALIZED to zero, which will indirectly | |
3237 | tell `finish_decl' to ignore the initializer once it is parsed. */ | |
3238 | switch (TREE_CODE (decl)) | |
3239 | { | |
3240 | case TYPE_DECL: | |
3241 | /* typedef foo = bar means give foo the same type as bar. | |
3242 | We haven't parsed bar yet, so `finish_decl' will fix that up. | |
3243 | Any other case of an initialization in a TYPE_DECL is an error. */ | |
3244 | if (pedantic || list_length (declspecs) > 1) | |
3245 | { | |
3246 | error ("typedef `%s' is initialized", | |
3247 | IDENTIFIER_POINTER (DECL_NAME (decl))); | |
3248 | initialized = 0; | |
3249 | } | |
3250 | break; | |
3251 | ||
3252 | case FUNCTION_DECL: | |
3253 | error ("function `%s' is initialized like a variable", | |
3254 | IDENTIFIER_POINTER (DECL_NAME (decl))); | |
3255 | initialized = 0; | |
3256 | break; | |
3257 | ||
3258 | case PARM_DECL: | |
3259 | /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */ | |
3260 | error ("parameter `%s' is initialized", | |
3261 | IDENTIFIER_POINTER (DECL_NAME (decl))); | |
3262 | initialized = 0; | |
3263 | break; | |
3264 | ||
3265 | default: | |
3266 | /* Don't allow initializations for incomplete types | |
3267 | except for arrays which might be completed by the initialization. */ | |
3268 | if (TYPE_SIZE (TREE_TYPE (decl)) != 0) | |
3269 | { | |
3270 | /* A complete type is ok if size is fixed. */ | |
3271 | ||
3272 | if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST | |
3273 | || C_DECL_VARIABLE_SIZE (decl)) | |
3274 | { | |
3275 | error ("variable-sized object may not be initialized"); | |
3276 | initialized = 0; | |
3277 | } | |
3278 | } | |
3279 | else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE) | |
3280 | { | |
3281 | error ("variable `%s' has initializer but incomplete type", | |
3282 | IDENTIFIER_POINTER (DECL_NAME (decl))); | |
3283 | initialized = 0; | |
3284 | } | |
3285 | else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0) | |
3286 | { | |
3287 | error ("elements of array `%s' have incomplete type", | |
3288 | IDENTIFIER_POINTER (DECL_NAME (decl))); | |
3289 | initialized = 0; | |
3290 | } | |
3291 | } | |
3292 | ||
3293 | if (initialized) | |
3294 | { | |
3295 | #if 0 /* Seems redundant with grokdeclarator. */ | |
3296 | if (current_binding_level != global_binding_level | |
1394aabd | 3297 | && DECL_EXTERNAL (decl) |
51e29401 RS |
3298 | && TREE_CODE (decl) != FUNCTION_DECL) |
3299 | warning ("declaration of `%s' has `extern' and is initialized", | |
3300 | IDENTIFIER_POINTER (DECL_NAME (decl))); | |
3301 | #endif | |
1394aabd | 3302 | DECL_EXTERNAL (decl) = 0; |
51e29401 RS |
3303 | if (current_binding_level == global_binding_level) |
3304 | TREE_STATIC (decl) = 1; | |
3305 | ||
3306 | /* Tell `pushdecl' this is an initialized decl | |
3307 | even though we don't yet have the initializer expression. | |
3308 | Also tell `finish_decl' it may store the real initializer. */ | |
3309 | DECL_INITIAL (decl) = error_mark_node; | |
3310 | } | |
3311 | ||
3312 | /* If this is a function declaration, write a record describing it to the | |
3313 | prototypes file (if requested). */ | |
3314 | ||
3315 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
3316 | gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0); | |
3317 | ||
3318 | /* Add this decl to the current binding level. | |
3319 | TEM may equal DECL or it may be a previous decl of the same name. */ | |
3320 | tem = pushdecl (decl); | |
3321 | ||
3322 | /* For a local variable, define the RTL now. */ | |
3323 | if (current_binding_level != global_binding_level | |
3324 | /* But not if this is a duplicate decl | |
3325 | and we preserved the rtl from the previous one | |
3326 | (which may or may not happen). */ | |
3327 | && DECL_RTL (tem) == 0) | |
3328 | { | |
3329 | if (TYPE_SIZE (TREE_TYPE (tem)) != 0) | |
3330 | expand_decl (tem); | |
3331 | else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE | |
3332 | && DECL_INITIAL (tem) != 0) | |
3333 | expand_decl (tem); | |
3334 | } | |
3335 | ||
3336 | if (init_written) | |
3337 | { | |
3338 | /* When parsing and digesting the initializer, | |
3339 | use temporary storage. Do this even if we will ignore the value. */ | |
3340 | if (current_binding_level == global_binding_level && debug_temp_inits) | |
3341 | temporary_allocation (); | |
3342 | } | |
3343 | ||
3344 | return tem; | |
3345 | } | |
3346 | ||
3347 | /* Finish processing of a declaration; | |
3348 | install its initial value. | |
3349 | If the length of an array type is not known before, | |
3350 | it must be determined now, from the initial value, or it is an error. */ | |
3351 | ||
3352 | void | |
3353 | finish_decl (decl, init, asmspec_tree) | |
3354 | tree decl, init; | |
3355 | tree asmspec_tree; | |
3356 | { | |
3357 | register tree type = TREE_TYPE (decl); | |
3358 | int was_incomplete = (DECL_SIZE (decl) == 0); | |
3359 | int temporary = allocation_temporary_p (); | |
3360 | char *asmspec = 0; | |
3361 | ||
3362 | if (asmspec_tree) | |
3363 | asmspec = TREE_STRING_POINTER (asmspec_tree); | |
3364 | ||
3365 | /* If `start_decl' didn't like having an initialization, ignore it now. */ | |
3366 | ||
3367 | if (init != 0 && DECL_INITIAL (decl) == 0) | |
3368 | init = 0; | |
3369 | /* Don't crash if parm is initialized. */ | |
3370 | if (TREE_CODE (decl) == PARM_DECL) | |
3371 | init = 0; | |
3372 | ||
519d591f RS |
3373 | if (ITERATOR_P (decl)) |
3374 | { | |
3375 | if (init == 0) | |
3376 | error_with_decl (decl, "iterator has no initial value"); | |
3377 | else | |
3378 | init = save_expr (init); | |
3379 | } | |
3380 | ||
51e29401 RS |
3381 | if (init) |
3382 | { | |
3383 | if (TREE_CODE (decl) != TYPE_DECL) | |
3384 | store_init_value (decl, init); | |
3385 | else | |
3386 | { | |
3387 | /* typedef foo = bar; store the type of bar as the type of foo. */ | |
3388 | TREE_TYPE (decl) = TREE_TYPE (init); | |
3389 | DECL_INITIAL (decl) = init = 0; | |
3390 | } | |
3391 | } | |
3392 | ||
7a0347ff RS |
3393 | /* Pop back to the obstack that is current for this binding level. |
3394 | This is because MAXINDEX, rtl, etc. to be made below | |
3395 | must go in the permanent obstack. But don't discard the | |
51e29401 | 3396 | temporary data yet. */ |
7a0347ff RS |
3397 | pop_obstacks (); |
3398 | #if 0 /* pop_obstacks was near the end; this is what was here. */ | |
51e29401 RS |
3399 | if (current_binding_level == global_binding_level && temporary) |
3400 | end_temporary_allocation (); | |
7a0347ff | 3401 | #endif |
51e29401 RS |
3402 | |
3403 | /* Deduce size of array from initialization, if not already known */ | |
3404 | ||
3405 | if (TREE_CODE (type) == ARRAY_TYPE | |
3406 | && TYPE_DOMAIN (type) == 0 | |
3407 | && TREE_CODE (decl) != TYPE_DECL) | |
3408 | { | |
3409 | int do_default | |
3410 | = (TREE_STATIC (decl) | |
3411 | /* Even if pedantic, an external linkage array | |
3412 | may have incomplete type at first. */ | |
3413 | ? pedantic && !TREE_PUBLIC (decl) | |
1394aabd | 3414 | : !DECL_EXTERNAL (decl)); |
51e29401 RS |
3415 | int failure |
3416 | = complete_array_type (type, DECL_INITIAL (decl), do_default); | |
3417 | ||
3418 | /* Get the completed type made by complete_array_type. */ | |
3419 | type = TREE_TYPE (decl); | |
3420 | ||
3421 | if (failure == 1) | |
3422 | error_with_decl (decl, "initializer fails to determine size of `%s'"); | |
3423 | ||
3424 | if (failure == 2) | |
3425 | { | |
3426 | if (do_default) | |
3427 | error_with_decl (decl, "array size missing in `%s'"); | |
b4892310 RS |
3428 | /* If a `static' var's size isn't known, |
3429 | make it extern as well as static, so it does not get | |
3430 | allocated. | |
3431 | If it is not `static', then do not mark extern; | |
3432 | finish_incomplete_decl will give it a default size | |
3433 | and it will get allocated. */ | |
3434 | else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl)) | |
1394aabd | 3435 | DECL_EXTERNAL (decl) = 1; |
51e29401 RS |
3436 | } |
3437 | ||
3438 | if (pedantic && TYPE_DOMAIN (type) != 0 | |
3439 | && tree_int_cst_lt (TYPE_MAX_VALUE (TYPE_DOMAIN (type)), | |
3440 | integer_zero_node)) | |
3441 | error_with_decl (decl, "zero-size array `%s'"); | |
3442 | ||
3443 | layout_decl (decl, 0); | |
3444 | } | |
3445 | ||
3446 | if (TREE_CODE (decl) == VAR_DECL) | |
3447 | { | |
d575f110 RS |
3448 | if (DECL_SIZE (decl) == 0 |
3449 | && TYPE_SIZE (TREE_TYPE (decl)) != 0) | |
3450 | layout_decl (decl, 0); | |
3451 | ||
a7f64d52 RS |
3452 | if (DECL_SIZE (decl) == 0 |
3453 | && (TREE_STATIC (decl) | |
3454 | ? | |
3455 | /* A static variable with an incomplete type | |
3456 | is an error if it is initialized or `static'. | |
3457 | Otherwise, let it through, but if it is not `extern' | |
3458 | then it may cause an error message later. */ | |
3459 | !TREE_PUBLIC (decl) || DECL_INITIAL (decl) | |
3460 | : | |
3461 | /* An automatic variable with an incomplete type | |
3462 | is an error. */ | |
70038ec9 | 3463 | !DECL_EXTERNAL (decl))) |
51e29401 | 3464 | { |
51e29401 RS |
3465 | error_with_decl (decl, "storage size of `%s' isn't known"); |
3466 | TREE_TYPE (decl) = error_mark_node; | |
3467 | } | |
3468 | ||
1394aabd | 3469 | if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl)) |
90374cc2 | 3470 | && DECL_SIZE (decl) != 0) |
e681c5a1 RS |
3471 | { |
3472 | if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST) | |
3473 | constant_expression_warning (DECL_SIZE (decl)); | |
3474 | else | |
3475 | error_with_decl (decl, "storage size of `%s' isn't constant"); | |
3476 | } | |
51e29401 RS |
3477 | } |
3478 | ||
3479 | /* Output the assembler code and/or RTL code for variables and functions, | |
3480 | unless the type is an undefined structure or union. | |
3481 | If not, it will get done when the type is completed. */ | |
3482 | ||
3483 | if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL) | |
3484 | { | |
3485 | if (flag_traditional && allocation_temporary_p ()) | |
3486 | { | |
3487 | push_obstacks_nochange (); | |
3488 | end_temporary_allocation (); | |
3489 | /* This is a no-op in c-lang.c or something real in objc-actions.c. */ | |
3490 | maybe_objc_check_decl (decl); | |
3491 | rest_of_decl_compilation (decl, asmspec, | |
3492 | current_binding_level == global_binding_level, | |
3493 | 0); | |
3494 | pop_obstacks (); | |
3495 | } | |
3496 | else | |
3497 | { | |
3498 | /* This is a no-op in c-lang.c or something real in objc-actions.c. */ | |
3499 | maybe_objc_check_decl (decl); | |
3500 | rest_of_decl_compilation (decl, asmspec, | |
3501 | current_binding_level == global_binding_level, | |
3502 | 0); | |
3503 | } | |
3504 | if (current_binding_level != global_binding_level) | |
3505 | { | |
3506 | /* Recompute the RTL of a local array now | |
3507 | if it used to be an incomplete type. */ | |
3508 | if (was_incomplete | |
1394aabd | 3509 | && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl)) |
51e29401 RS |
3510 | { |
3511 | /* If we used it already as memory, it must stay in memory. */ | |
3512 | TREE_ADDRESSABLE (decl) = TREE_USED (decl); | |
3513 | /* If it's still incomplete now, no init will save it. */ | |
3514 | if (DECL_SIZE (decl) == 0) | |
3515 | DECL_INITIAL (decl) = 0; | |
3516 | expand_decl (decl); | |
3517 | } | |
3518 | /* Compute and store the initial value. */ | |
42dfa47f RS |
3519 | if (TREE_CODE (decl) != FUNCTION_DECL) |
3520 | expand_decl_init (decl); | |
51e29401 RS |
3521 | } |
3522 | } | |
3523 | ||
3524 | if (TREE_CODE (decl) == TYPE_DECL) | |
3525 | { | |
3526 | /* This is a no-op in c-lang.c or something real in objc-actions.c. */ | |
3527 | maybe_objc_check_decl (decl); | |
8d9bfdc5 | 3528 | rest_of_decl_compilation (decl, NULL_PTR, |
51e29401 RS |
3529 | current_binding_level == global_binding_level, |
3530 | 0); | |
3531 | } | |
3532 | ||
14f3e886 RS |
3533 | /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */ |
3534 | if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl)) | |
eda115dd RS |
3535 | && temporary && TREE_PERMANENT (decl) |
3536 | /* DECL_INITIAL is not defined in PARM_DECLs, since it shares | |
3537 | space with DECL_ARG_TYPE. */ | |
3538 | && TREE_CODE (decl) != PARM_DECL) | |
51e29401 RS |
3539 | { |
3540 | /* We need to remember that this array HAD an initialization, | |
3541 | but discard the actual temporary nodes, | |
3542 | since we can't have a permanent node keep pointing to them. */ | |
14f3e886 RS |
3543 | /* We make an exception for inline functions, since it's |
3544 | normal for a local extern redeclaration of an inline function | |
3545 | to have a copy of the top-level decl's DECL_INLINE. */ | |
51e29401 RS |
3546 | if (DECL_INITIAL (decl) != 0) |
3547 | DECL_INITIAL (decl) = error_mark_node; | |
3548 | } | |
3549 | ||
7a0347ff | 3550 | #if 0 |
51e29401 RS |
3551 | /* Resume permanent allocation, if not within a function. */ |
3552 | /* The corresponding push_obstacks_nochange is in start_decl, | |
3553 | and in push_parm_decl and in grokfield. */ | |
3554 | pop_obstacks (); | |
7a0347ff RS |
3555 | #endif |
3556 | ||
3557 | /* If we have gone back from temporary to permanent allocation, | |
3558 | actually free the temporary space that we no longer need. */ | |
3559 | if (temporary && !allocation_temporary_p ()) | |
51e29401 RS |
3560 | permanent_allocation (); |
3561 | ||
3562 | /* At the end of a declaration, throw away any variable type sizes | |
3563 | of types defined inside that declaration. There is no use | |
3564 | computing them in the following function definition. */ | |
3565 | if (current_binding_level == global_binding_level) | |
3566 | get_pending_sizes (); | |
3567 | } | |
3568 | ||
3569 | /* If DECL has a cleanup, build and return that cleanup here. | |
3570 | This is a callback called by expand_expr. */ | |
3571 | ||
3572 | tree | |
3573 | maybe_build_cleanup (decl) | |
3574 | tree decl; | |
3575 | { | |
3576 | /* There are no cleanups in C. */ | |
3577 | return NULL_TREE; | |
3578 | } | |
3579 | ||
3580 | /* Given a parsed parameter declaration, | |
3581 | decode it into a PARM_DECL and push that on the current binding level. | |
3582 | Also, for the sake of forward parm decls, | |
3583 | record the given order of parms in `parm_order'. */ | |
3584 | ||
3585 | void | |
3586 | push_parm_decl (parm) | |
3587 | tree parm; | |
3588 | { | |
93e3ba4f | 3589 | tree decl, olddecl; |
929f3671 RS |
3590 | int old_immediate_size_expand = immediate_size_expand; |
3591 | /* Don't try computing parm sizes now -- wait till fn is called. */ | |
3592 | immediate_size_expand = 0; | |
51e29401 RS |
3593 | |
3594 | /* The corresponding pop_obstacks is in finish_decl. */ | |
3595 | push_obstacks_nochange (); | |
3596 | ||
3597 | decl = grokdeclarator (TREE_VALUE (parm), TREE_PURPOSE (parm), PARM, 0); | |
6a5ed5bf RK |
3598 | |
3599 | #if 0 | |
93e3ba4f RS |
3600 | if (DECL_NAME (decl)) |
3601 | { | |
3602 | olddecl = lookup_name (DECL_NAME (decl)); | |
3603 | if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL) | |
3604 | pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef"); | |
3605 | } | |
6a5ed5bf RK |
3606 | #endif |
3607 | ||
51e29401 RS |
3608 | decl = pushdecl (decl); |
3609 | ||
929f3671 RS |
3610 | immediate_size_expand = old_immediate_size_expand; |
3611 | ||
51e29401 RS |
3612 | current_binding_level->parm_order |
3613 | = tree_cons (NULL_TREE, decl, current_binding_level->parm_order); | |
3614 | ||
3615 | /* Add this decl to the current binding level. */ | |
3616 | finish_decl (decl, NULL_TREE, NULL_TREE); | |
3617 | } | |
3618 | ||
3619 | /* Clear the given order of parms in `parm_order'. | |
3620 | Used at start of parm list, | |
3621 | and also at semicolon terminating forward decls. */ | |
3622 | ||
3623 | void | |
3624 | clear_parm_order () | |
3625 | { | |
3626 | current_binding_level->parm_order = NULL_TREE; | |
3627 | } | |
3628 | \f | |
3629 | /* Make TYPE a complete type based on INITIAL_VALUE. | |
929f3671 | 3630 | Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered, |
51e29401 RS |
3631 | 2 if there was no information (in which case assume 1 if DO_DEFAULT). */ |
3632 | ||
3633 | int | |
3634 | complete_array_type (type, initial_value, do_default) | |
3635 | tree type; | |
3636 | tree initial_value; | |
3637 | int do_default; | |
3638 | { | |
3639 | register tree maxindex = NULL_TREE; | |
3640 | int value = 0; | |
3641 | ||
3642 | if (initial_value) | |
3643 | { | |
3644 | /* Note MAXINDEX is really the maximum index, | |
3645 | one less than the size. */ | |
3646 | if (TREE_CODE (initial_value) == STRING_CST) | |
3647 | { | |
3648 | int eltsize | |
3649 | = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value))); | |
3650 | maxindex = build_int_2 (TREE_STRING_LENGTH (initial_value) / eltsize - 1, 0); | |
3651 | } | |
3652 | else if (TREE_CODE (initial_value) == CONSTRUCTOR) | |
3653 | { | |
3654 | register int nelts | |
3655 | = list_length (CONSTRUCTOR_ELTS (initial_value)); | |
e1fe03e9 | 3656 | maxindex = build_int_2 (nelts - 1, - (nelts == 0)); |
51e29401 RS |
3657 | } |
3658 | else | |
3659 | { | |
3660 | /* Make an error message unless that happened already. */ | |
3661 | if (initial_value != error_mark_node) | |
3662 | value = 1; | |
3663 | ||
3664 | /* Prevent further error messages. */ | |
b4892310 | 3665 | maxindex = build_int_2 (0, 0); |
51e29401 RS |
3666 | } |
3667 | } | |
3668 | ||
3669 | if (!maxindex) | |
3670 | { | |
3671 | if (do_default) | |
b4892310 | 3672 | maxindex = build_int_2 (0, 0); |
51e29401 RS |
3673 | value = 2; |
3674 | } | |
3675 | ||
3676 | if (maxindex) | |
3677 | { | |
3678 | TYPE_DOMAIN (type) = build_index_type (maxindex); | |
3679 | if (!TREE_TYPE (maxindex)) | |
3680 | TREE_TYPE (maxindex) = TYPE_DOMAIN (type); | |
f4e59008 RS |
3681 | #if 0 /* I took out this change |
3682 | together with the change in build_array_type. --rms */ | |
e1fe03e9 RS |
3683 | change_main_variant (type, |
3684 | build_array_type (TREE_TYPE (type), | |
3685 | TYPE_DOMAIN (type))); | |
f4e59008 | 3686 | #endif |
51e29401 RS |
3687 | } |
3688 | ||
3689 | /* Lay out the type now that we can get the real answer. */ | |
3690 | ||
3691 | layout_type (type); | |
3692 | ||
3693 | return value; | |
3694 | } | |
3695 | \f | |
3696 | /* Given declspecs and a declarator, | |
3697 | determine the name and type of the object declared | |
3698 | and construct a ..._DECL node for it. | |
3699 | (In one case we can return a ..._TYPE node instead. | |
3700 | For invalid input we sometimes return 0.) | |
3701 | ||
3702 | DECLSPECS is a chain of tree_list nodes whose value fields | |
3703 | are the storage classes and type specifiers. | |
3704 | ||
3705 | DECL_CONTEXT says which syntactic context this declaration is in: | |
3706 | NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL. | |
3707 | FUNCDEF for a function definition. Like NORMAL but a few different | |
3708 | error messages in each case. Return value may be zero meaning | |
3709 | this definition is too screwy to try to parse. | |
3710 | PARM for a parameter declaration (either within a function prototype | |
3711 | or before a function body). Make a PARM_DECL, or return void_type_node. | |
3712 | TYPENAME if for a typename (in a cast or sizeof). | |
3713 | Don't make a DECL node; just return the ..._TYPE node. | |
3714 | FIELD for a struct or union field; make a FIELD_DECL. | |
3715 | BITFIELD for a field with specified width. | |
3716 | INITIALIZED is 1 if the decl has an initializer. | |
3717 | ||
3718 | In the TYPENAME case, DECLARATOR is really an absolute declarator. | |
3719 | It may also be so in the PARM case, for a prototype where the | |
3720 | argument type is specified but not the name. | |
3721 | ||
3722 | This function is where the complicated C meanings of `static' | |
929f3671 | 3723 | and `extern' are interpreted. */ |
51e29401 RS |
3724 | |
3725 | static tree | |
3726 | grokdeclarator (declarator, declspecs, decl_context, initialized) | |
3727 | tree declspecs; | |
3728 | tree declarator; | |
3729 | enum decl_context decl_context; | |
3730 | int initialized; | |
3731 | { | |
3732 | int specbits = 0; | |
3733 | tree spec; | |
3734 | tree type = NULL_TREE; | |
3735 | int longlong = 0; | |
3736 | int constp; | |
3737 | int volatilep; | |
3738 | int inlinep; | |
3739 | int explicit_int = 0; | |
3740 | int explicit_char = 0; | |
5ab10c42 | 3741 | int defaulted_int = 0; |
51e29401 RS |
3742 | tree typedef_decl = 0; |
3743 | char *name; | |
3744 | tree typedef_type = 0; | |
3745 | int funcdef_flag = 0; | |
3746 | enum tree_code innermost_code = ERROR_MARK; | |
3747 | int bitfield = 0; | |
929f3671 | 3748 | int size_varies = 0; |
51e29401 RS |
3749 | |
3750 | if (decl_context == BITFIELD) | |
3751 | bitfield = 1, decl_context = FIELD; | |
3752 | ||
3753 | if (decl_context == FUNCDEF) | |
3754 | funcdef_flag = 1, decl_context = NORMAL; | |
3755 | ||
3756 | push_obstacks_nochange (); | |
3757 | ||
3758 | if (flag_traditional && allocation_temporary_p ()) | |
3759 | end_temporary_allocation (); | |
3760 | ||
3761 | /* Look inside a declarator for the name being declared | |
3762 | and get it as a string, for an error message. */ | |
3763 | { | |
3764 | register tree decl = declarator; | |
3765 | name = 0; | |
3766 | ||
3767 | while (decl) | |
3768 | switch (TREE_CODE (decl)) | |
3769 | { | |
3770 | case ARRAY_REF: | |
3771 | case INDIRECT_REF: | |
3772 | case CALL_EXPR: | |
3773 | innermost_code = TREE_CODE (decl); | |
3774 | decl = TREE_OPERAND (decl, 0); | |
3775 | break; | |
3776 | ||
3777 | case IDENTIFIER_NODE: | |
3778 | name = IDENTIFIER_POINTER (decl); | |
3779 | decl = 0; | |
3780 | break; | |
3781 | ||
3782 | default: | |
3783 | abort (); | |
3784 | } | |
3785 | if (name == 0) | |
3786 | name = "type name"; | |
3787 | } | |
3788 | ||
3789 | /* A function definition's declarator must have the form of | |
3790 | a function declarator. */ | |
3791 | ||
3792 | if (funcdef_flag && innermost_code != CALL_EXPR) | |
3793 | return 0; | |
3794 | ||
3795 | /* Anything declared one level down from the top level | |
3796 | must be one of the parameters of a function | |
3797 | (because the body is at least two levels down). */ | |
3798 | ||
3799 | /* If this looks like a function definition, make it one, | |
3800 | even if it occurs where parms are expected. | |
3801 | Then store_parm_decls will reject it and not use it as a parm. */ | |
3802 | if (decl_context == NORMAL && !funcdef_flag | |
3803 | && current_binding_level->level_chain == global_binding_level) | |
3804 | decl_context = PARM; | |
3805 | ||
3806 | /* Look through the decl specs and record which ones appear. | |
3807 | Some typespecs are defined as built-in typenames. | |
3808 | Others, the ones that are modifiers of other types, | |
3809 | are represented by bits in SPECBITS: set the bits for | |
3810 | the modifiers that appear. Storage class keywords are also in SPECBITS. | |
3811 | ||
3812 | If there is a typedef name or a type, store the type in TYPE. | |
3813 | This includes builtin typedefs such as `int'. | |
3814 | ||
3815 | Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char' | |
3816 | and did not come from a user typedef. | |
3817 | ||
3818 | Set LONGLONG if `long' is mentioned twice. */ | |
3819 | ||
3820 | for (spec = declspecs; spec; spec = TREE_CHAIN (spec)) | |
3821 | { | |
3822 | register int i; | |
3823 | register tree id = TREE_VALUE (spec); | |
3824 | ||
3825 | if (id == ridpointers[(int) RID_INT]) | |
3826 | explicit_int = 1; | |
3827 | if (id == ridpointers[(int) RID_CHAR]) | |
3828 | explicit_char = 1; | |
3829 | ||
3830 | if (TREE_CODE (id) == IDENTIFIER_NODE) | |
3831 | for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++) | |
3832 | { | |
3833 | if (ridpointers[i] == id) | |
3834 | { | |
3835 | if (i == (int) RID_LONG && specbits & (1<<i)) | |
3836 | { | |
89d7540d | 3837 | if (longlong) |
47429a02 | 3838 | error ("`long long long' is too long for GCC"); |
51e29401 | 3839 | else |
89d7540d RS |
3840 | { |
3841 | if (pedantic) | |
3842 | pedwarn ("ANSI C does not support `long long'"); | |
3843 | longlong = 1; | |
3844 | } | |
51e29401 RS |
3845 | } |
3846 | else if (specbits & (1 << i)) | |
93e3ba4f | 3847 | pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id)); |
51e29401 RS |
3848 | specbits |= 1 << i; |
3849 | goto found; | |
3850 | } | |
3851 | } | |
3852 | if (type) | |
3853 | error ("two or more data types in declaration of `%s'", name); | |
3854 | /* Actual typedefs come to us as TYPE_DECL nodes. */ | |
3855 | else if (TREE_CODE (id) == TYPE_DECL) | |
3856 | { | |
3857 | type = TREE_TYPE (id); | |
3858 | typedef_decl = id; | |
3859 | } | |
3860 | /* Built-in types come as identifiers. */ | |
3861 | else if (TREE_CODE (id) == IDENTIFIER_NODE) | |
3862 | { | |
3863 | register tree t = lookup_name (id); | |
3864 | if (TREE_TYPE (t) == error_mark_node) | |
3865 | ; | |
3866 | else if (!t || TREE_CODE (t) != TYPE_DECL) | |
3867 | error ("`%s' fails to be a typedef or built in type", | |
3868 | IDENTIFIER_POINTER (id)); | |
3869 | else | |
3870 | { | |
3871 | type = TREE_TYPE (t); | |
3872 | typedef_decl = t; | |
3873 | } | |
3874 | } | |
3875 | else if (TREE_CODE (id) != ERROR_MARK) | |
3876 | type = id; | |
3877 | ||
3878 | found: {} | |
3879 | } | |
3880 | ||
3881 | typedef_type = type; | |
3882 | if (type) | |
929f3671 | 3883 | size_varies = C_TYPE_VARIABLE_SIZE (type); |
51e29401 | 3884 | |
5ab10c42 | 3885 | /* No type at all: default to `int', and set DEFAULTED_INT |
51e29401 RS |
3886 | because it was not a user-defined typedef. */ |
3887 | ||
3888 | if (type == 0) | |
3889 | { | |
3890 | if (funcdef_flag && warn_return_type | |
3891 | && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT) | |
3892 | | (1 << (int) RID_SIGNED) | (1 << (int) RID_UNSIGNED)))) | |
3893 | warn_about_return_type = 1; | |
5ab10c42 | 3894 | defaulted_int = 1; |
51e29401 RS |
3895 | type = integer_type_node; |
3896 | } | |
3897 | ||
3898 | /* Now process the modifiers that were specified | |
3899 | and check for invalid combinations. */ | |
3900 | ||
3901 | /* Long double is a special combination. */ | |
3902 | ||
90d56da8 RS |
3903 | if ((specbits & 1 << (int) RID_LONG) |
3904 | && TYPE_MAIN_VARIANT (type) == double_type_node) | |
51e29401 RS |
3905 | { |
3906 | specbits &= ~ (1 << (int) RID_LONG); | |
3907 | type = long_double_type_node; | |
3908 | } | |
3909 | ||
3910 | /* Check all other uses of type modifiers. */ | |
3911 | ||
3912 | if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT) | |
3913 | | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED))) | |
3914 | { | |
3915 | int ok = 0; | |
3916 | ||
3917 | if (TREE_CODE (type) != INTEGER_TYPE) | |
3918 | error ("long, short, signed or unsigned invalid for `%s'", name); | |
3919 | else if ((specbits & 1 << (int) RID_LONG) | |
3920 | && (specbits & 1 << (int) RID_SHORT)) | |
3921 | error ("long and short specified together for `%s'", name); | |
3922 | else if (((specbits & 1 << (int) RID_LONG) | |
3923 | || (specbits & 1 << (int) RID_SHORT)) | |
3924 | && explicit_char) | |
3925 | error ("long or short specified with char for `%s'", name); | |
3926 | else if (((specbits & 1 << (int) RID_LONG) | |
3927 | || (specbits & 1 << (int) RID_SHORT)) | |
3928 | && TREE_CODE (type) == REAL_TYPE) | |
3929 | error ("long or short specified with floating type for `%s'", name); | |
3930 | else if ((specbits & 1 << (int) RID_SIGNED) | |
3931 | && (specbits & 1 << (int) RID_UNSIGNED)) | |
3932 | error ("signed and unsigned given together for `%s'", name); | |
3933 | else | |
3934 | { | |
3935 | ok = 1; | |
5ab10c42 | 3936 | if (!explicit_int && !defaulted_int && !explicit_char && pedantic) |
51e29401 RS |
3937 | { |
3938 | pedwarn ("long, short, signed or unsigned used invalidly for `%s'", | |
3939 | name); | |
3940 | if (flag_pedantic_errors) | |
3941 | ok = 0; | |
3942 | } | |
3943 | } | |
3944 | ||
3945 | /* Discard the type modifiers if they are invalid. */ | |
3946 | if (! ok) | |
3947 | { | |
3948 | specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT) | |
3949 | | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)); | |
3950 | longlong = 0; | |
3951 | } | |
3952 | } | |
3953 | ||
3954 | /* Decide whether an integer type is signed or not. | |
3955 | Optionally treat bitfields as signed by default. */ | |
3956 | if (specbits & 1 << (int) RID_UNSIGNED | |
3957 | /* Traditionally, all bitfields are unsigned. */ | |
7a0347ff RS |
3958 | || (bitfield && flag_traditional |
3959 | && (! explicit_flag_signed_bitfields || !flag_signed_bitfields)) | |
51e29401 | 3960 | || (bitfield && ! flag_signed_bitfields |
5ab10c42 | 3961 | && (explicit_int || defaulted_int || explicit_char |
51e29401 RS |
3962 | /* A typedef for plain `int' without `signed' |
3963 | can be controlled just like plain `int'. */ | |
3964 | || ! (typedef_decl != 0 | |
3965 | && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))) | |
3966 | && TREE_CODE (type) != ENUMERAL_TYPE | |
3967 | && !(specbits & 1 << (int) RID_SIGNED))) | |
3968 | { | |
3969 | if (longlong) | |
3970 | type = long_long_unsigned_type_node; | |
3971 | else if (specbits & 1 << (int) RID_LONG) | |
3972 | type = long_unsigned_type_node; | |
3973 | else if (specbits & 1 << (int) RID_SHORT) | |
3974 | type = short_unsigned_type_node; | |
3975 | else if (type == char_type_node) | |
3976 | type = unsigned_char_type_node; | |
3977 | else if (typedef_decl) | |
3978 | type = unsigned_type (type); | |
3979 | else | |
3980 | type = unsigned_type_node; | |
3981 | } | |
3982 | else if ((specbits & 1 << (int) RID_SIGNED) | |
3983 | && type == char_type_node) | |
3984 | type = signed_char_type_node; | |
3985 | else if (longlong) | |
3986 | type = long_long_integer_type_node; | |
3987 | else if (specbits & 1 << (int) RID_LONG) | |
3988 | type = long_integer_type_node; | |
3989 | else if (specbits & 1 << (int) RID_SHORT) | |
3990 | type = short_integer_type_node; | |
5ab10c42 RS |
3991 | else if (specbits & 1 << (int) RID_COMPLEX) |
3992 | { | |
3993 | if (defaulted_int) | |
3994 | type = complex_double_type_node; | |
3995 | else if (type == integer_type_node) | |
3996 | type = complex_integer_type_node; | |
3997 | else if (type == float_type_node) | |
3998 | type = complex_float_type_node; | |
3999 | else if (type == double_type_node) | |
4000 | type = complex_double_type_node; | |
4001 | else if (type == long_double_type_node) | |
4002 | type = complex_long_double_type_node; | |
4003 | else | |
4004 | error ("invalid complex type"); | |
4005 | } | |
51e29401 RS |
4006 | |
4007 | /* Set CONSTP if this declaration is `const', whether by | |
4008 | explicit specification or via a typedef. | |
4009 | Likewise for VOLATILEP. */ | |
4010 | ||
4011 | constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type); | |
4012 | volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type); | |
4013 | inlinep = !! (specbits & (1 << (int) RID_INLINE)); | |
4014 | if (constp > 1) | |
93e3ba4f | 4015 | pedwarn ("duplicate `const'"); |
51e29401 | 4016 | if (volatilep > 1) |
93e3ba4f | 4017 | pedwarn ("duplicate `volatile'"); |
51e29401 RS |
4018 | if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type))) |
4019 | type = TYPE_MAIN_VARIANT (type); | |
4020 | ||
4021 | /* Warn if two storage classes are given. Default to `auto'. */ | |
4022 | ||
4023 | { | |
4024 | int nclasses = 0; | |
4025 | ||
4026 | if (specbits & 1 << (int) RID_AUTO) nclasses++; | |
4027 | if (specbits & 1 << (int) RID_STATIC) nclasses++; | |
4028 | if (specbits & 1 << (int) RID_EXTERN) nclasses++; | |
4029 | if (specbits & 1 << (int) RID_REGISTER) nclasses++; | |
4030 | if (specbits & 1 << (int) RID_TYPEDEF) nclasses++; | |
519d591f | 4031 | if (specbits & 1 << (int) RID_ITERATOR) nclasses++; |
51e29401 RS |
4032 | |
4033 | /* Warn about storage classes that are invalid for certain | |
4034 | kinds of declarations (parameters, typenames, etc.). */ | |
4035 | ||
4036 | if (nclasses > 1) | |
4037 | error ("multiple storage classes in declaration of `%s'", name); | |
4038 | else if (funcdef_flag | |
4039 | && (specbits | |
4040 | & ((1 << (int) RID_REGISTER) | |
4041 | | (1 << (int) RID_AUTO) | |
4042 | | (1 << (int) RID_TYPEDEF)))) | |
4043 | { | |
4044 | if (specbits & 1 << (int) RID_AUTO | |
4045 | && (pedantic || current_binding_level == global_binding_level)) | |
4046 | pedwarn ("function definition declared `auto'"); | |
4047 | if (specbits & 1 << (int) RID_REGISTER) | |
4048 | error ("function definition declared `register'"); | |
4049 | if (specbits & 1 << (int) RID_TYPEDEF) | |
4050 | error ("function definition declared `typedef'"); | |
4051 | specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER) | |
4052 | | (1 << (int) RID_AUTO)); | |
4053 | } | |
4054 | else if (decl_context != NORMAL && nclasses > 0) | |
4055 | { | |
4056 | if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER) | |
4057 | ; | |
4058 | else | |
4059 | { | |
4060 | error ((decl_context == FIELD | |
4061 | ? "storage class specified for structure field `%s'" | |
4062 | : (decl_context == PARM | |
4063 | ? "storage class specified for parameter `%s'" | |
4064 | : "storage class specified for typename")), | |
4065 | name); | |
4066 | specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER) | |
4067 | | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC) | |
4068 | | (1 << (int) RID_EXTERN)); | |
4069 | } | |
4070 | } | |
4071 | else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag) | |
4072 | { | |
4073 | /* `extern' with initialization is invalid if not at top level. */ | |
4074 | if (current_binding_level == global_binding_level) | |
4075 | warning ("`%s' initialized and declared `extern'", name); | |
4076 | else | |
4077 | error ("`%s' has both `extern' and initializer", name); | |
4078 | } | |
4079 | else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag | |
4080 | && current_binding_level != global_binding_level) | |
4081 | error ("nested function `%s' declared `extern'", name); | |
4082 | else if (current_binding_level == global_binding_level | |
4083 | && specbits & (1 << (int) RID_AUTO)) | |
4084 | error ("top-level declaration of `%s' specifies `auto'", name); | |
519d591f RS |
4085 | else if ((specbits & 1 << (int) RID_ITERATOR) |
4086 | && TREE_CODE (declarator) != IDENTIFIER_NODE) | |
4087 | { | |
4088 | error ("iterator `%s' has derived type", name); | |
4089 | type = error_mark_node; | |
4090 | } | |
4091 | else if ((specbits & 1 << (int) RID_ITERATOR) | |
4092 | && TREE_CODE (type) != INTEGER_TYPE) | |
4093 | { | |
4094 | error ("iterator `%s' has noninteger type", name); | |
4095 | type = error_mark_node; | |
4096 | } | |
51e29401 RS |
4097 | } |
4098 | ||
4099 | /* Now figure out the structure of the declarator proper. | |
4100 | Descend through it, creating more complex types, until we reach | |
4101 | the declared identifier (or NULL_TREE, in an absolute declarator). */ | |
4102 | ||
4103 | while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE) | |
4104 | { | |
4105 | if (type == error_mark_node) | |
4106 | { | |
4107 | declarator = TREE_OPERAND (declarator, 0); | |
4108 | continue; | |
4109 | } | |
4110 | ||
4111 | /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]), | |
4112 | an INDIRECT_REF (for *...), | |
4113 | a CALL_EXPR (for ...(...)), | |
4114 | an identifier (for the name being declared) | |
4115 | or a null pointer (for the place in an absolute declarator | |
4116 | where the name was omitted). | |
4117 | For the last two cases, we have just exited the loop. | |
4118 | ||
4119 | At this point, TYPE is the type of elements of an array, | |
4120 | or for a function to return, or for a pointer to point to. | |
4121 | After this sequence of ifs, TYPE is the type of the | |
4122 | array or function or pointer, and DECLARATOR has had its | |
4123 | outermost layer removed. */ | |
4124 | ||
4125 | if (TREE_CODE (declarator) == ARRAY_REF) | |
4126 | { | |
4127 | register tree itype = NULL_TREE; | |
4128 | register tree size = TREE_OPERAND (declarator, 1); | |
e0e2f469 JW |
4129 | /* An uninitialized decl with `extern' is a reference. */ |
4130 | int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN)); | |
51e29401 RS |
4131 | |
4132 | declarator = TREE_OPERAND (declarator, 0); | |
4133 | ||
4134 | /* Check for some types that there cannot be arrays of. */ | |
4135 | ||
5fe86b8b | 4136 | if (TYPE_MAIN_VARIANT (type) == void_type_node) |
51e29401 RS |
4137 | { |
4138 | error ("declaration of `%s' as array of voids", name); | |
4139 | type = error_mark_node; | |
4140 | } | |
4141 | ||
4142 | if (TREE_CODE (type) == FUNCTION_TYPE) | |
4143 | { | |
4144 | error ("declaration of `%s' as array of functions", name); | |
4145 | type = error_mark_node; | |
4146 | } | |
4147 | ||
4148 | if (size == error_mark_node) | |
4149 | type = error_mark_node; | |
4150 | ||
4151 | if (type == error_mark_node) | |
4152 | continue; | |
4153 | ||
e0e2f469 JW |
4154 | /* If this is a block level extern, it must live past the end |
4155 | of the function so that we can check it against other extern | |
4156 | declarations (IDENTIFIER_LIMBO_VALUE). */ | |
4157 | if (extern_ref && allocation_temporary_p ()) | |
4158 | end_temporary_allocation (); | |
4159 | ||
51e29401 RS |
4160 | /* If size was specified, set ITYPE to a range-type for that size. |
4161 | Otherwise, ITYPE remains null. finish_decl may figure it out | |
4162 | from an initial value. */ | |
4163 | ||
4164 | if (size) | |
4165 | { | |
4166 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
874a7be1 | 4167 | STRIP_TYPE_NOPS (size); |
51e29401 RS |
4168 | |
4169 | if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE | |
4170 | && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE) | |
4171 | { | |
4172 | error ("size of array `%s' has non-integer type", name); | |
4173 | size = integer_one_node; | |
4174 | } | |
4175 | if (pedantic && integer_zerop (size)) | |
4176 | pedwarn ("ANSI C forbids zero-size array `%s'", name); | |
4177 | if (TREE_CODE (size) == INTEGER_CST) | |
4178 | { | |
90374cc2 | 4179 | constant_expression_warning (size); |
51e29401 RS |
4180 | if (INT_CST_LT (size, integer_zero_node)) |
4181 | { | |
4182 | error ("size of array `%s' is negative", name); | |
4183 | size = integer_one_node; | |
4184 | } | |
ec2343c4 MM |
4185 | itype = build_index_type (size_binop (MINUS_EXPR, size, |
4186 | size_one_node)); | |
51e29401 RS |
4187 | } |
4188 | else | |
4189 | { | |
4190 | if (pedantic) | |
1a6603da RS |
4191 | { |
4192 | if (TREE_CONSTANT (size)) | |
4193 | pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name); | |
4194 | else | |
4195 | pedwarn ("ANSI C forbids variable-size array `%s'", name); | |
4196 | } | |
51e29401 RS |
4197 | itype = build_binary_op (MINUS_EXPR, size, integer_one_node, |
4198 | 1); | |
4199 | /* Make sure the array size remains visibly nonconstant | |
4200 | even if it is (eg) a const variable with known value. */ | |
929f3671 RS |
4201 | size_varies = 1; |
4202 | itype = variable_size (itype); | |
4203 | itype = build_index_type (itype); | |
51e29401 RS |
4204 | } |
4205 | } | |
4206 | ||
4207 | #if 0 /* This had bad results for pointers to arrays, as in | |
4208 | union incomplete (*foo)[4]; */ | |
4209 | /* Complain about arrays of incomplete types, except in typedefs. */ | |
4210 | ||
4211 | if (TYPE_SIZE (type) == 0 | |
4212 | /* Avoid multiple warnings for nested array types. */ | |
4213 | && TREE_CODE (type) != ARRAY_TYPE | |
4214 | && !(specbits & (1 << (int) RID_TYPEDEF)) | |
4215 | && !C_TYPE_BEING_DEFINED (type)) | |
4216 | warning ("array type has incomplete element type"); | |
4217 | #endif | |
4218 | ||
51e29401 RS |
4219 | #if 0 /* We shouldn't have a function type here at all! |
4220 | Functions aren't allowed as array elements. */ | |
4221 | if (pedantic && TREE_CODE (type) == FUNCTION_TYPE | |
4222 | && (constp || volatilep)) | |
4223 | pedwarn ("ANSI C forbids const or volatile function types"); | |
4224 | #endif | |
50e65854 JW |
4225 | |
4226 | /* Build the array type itself, then merge any constancy or | |
4227 | volatility into the target type. We must do it in this order | |
4228 | to ensure that the TYPE_MAIN_VARIANT field of the array type | |
4229 | is set correctly. */ | |
4230 | ||
4231 | type = build_array_type (type, itype); | |
51e29401 RS |
4232 | if (constp || volatilep) |
4233 | type = c_build_type_variant (type, constp, volatilep); | |
4234 | ||
4235 | #if 0 /* don't clear these; leave them set so that the array type | |
4236 | or the variable is itself const or volatile. */ | |
4237 | constp = 0; | |
4238 | volatilep = 0; | |
4239 | #endif | |
4240 | ||
929f3671 | 4241 | if (size_varies) |
51e29401 RS |
4242 | C_TYPE_VARIABLE_SIZE (type) = 1; |
4243 | } | |
4244 | else if (TREE_CODE (declarator) == CALL_EXPR) | |
4245 | { | |
fd0b8fce JW |
4246 | int extern_ref = (!(specbits & (1 << (int) RID_AUTO)) |
4247 | || current_binding_level == global_binding_level); | |
51e29401 RS |
4248 | tree arg_types; |
4249 | ||
4250 | /* Declaring a function type. | |
4251 | Make sure we have a valid type for the function to return. */ | |
4252 | if (type == error_mark_node) | |
4253 | continue; | |
4254 | ||
929f3671 | 4255 | size_varies = 0; |
51e29401 RS |
4256 | |
4257 | /* Warn about some types functions can't return. */ | |
4258 | ||
4259 | if (TREE_CODE (type) == FUNCTION_TYPE) | |
4260 | { | |
4261 | error ("`%s' declared as function returning a function", name); | |
4262 | type = integer_type_node; | |
4263 | } | |
4264 | if (TREE_CODE (type) == ARRAY_TYPE) | |
4265 | { | |
4266 | error ("`%s' declared as function returning an array", name); | |
4267 | type = integer_type_node; | |
4268 | } | |
4269 | ||
4270 | #ifndef TRADITIONAL_RETURN_FLOAT | |
4271 | /* Traditionally, declaring return type float means double. */ | |
4272 | ||
90d56da8 | 4273 | if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node) |
51e29401 RS |
4274 | type = double_type_node; |
4275 | #endif /* TRADITIONAL_RETURN_FLOAT */ | |
4276 | ||
fd0b8fce JW |
4277 | /* If this is a block level extern, it must live past the end |
4278 | of the function so that we can check it against other extern | |
4279 | declarations (IDENTIFIER_LIMBO_VALUE). */ | |
4280 | if (extern_ref && allocation_temporary_p ()) | |
4281 | end_temporary_allocation (); | |
4282 | ||
51e29401 RS |
4283 | /* Construct the function type and go to the next |
4284 | inner layer of declarator. */ | |
4285 | ||
4286 | arg_types = grokparms (TREE_OPERAND (declarator, 1), | |
4287 | funcdef_flag | |
4288 | /* Say it's a definition | |
4289 | only for the CALL_EXPR | |
4290 | closest to the identifier. */ | |
4291 | && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE); | |
4292 | #if 0 /* This seems to be false. We turn off temporary allocation | |
4293 | above in this function if -traditional. | |
4294 | And this code caused inconsistent results with prototypes: | |
4295 | callers would ignore them, and pass arguments wrong. */ | |
4296 | ||
4297 | /* Omit the arg types if -traditional, since the arg types | |
4298 | and the list links might not be permanent. */ | |
8d9bfdc5 RK |
4299 | type = build_function_type (type, |
4300 | flag_traditional | |
4301 | ? NULL_TREE : arg_types); | |
51e29401 RS |
4302 | #endif |
4303 | type = build_function_type (type, arg_types); | |
4304 | declarator = TREE_OPERAND (declarator, 0); | |
4305 | ||
4306 | /* Set the TYPE_CONTEXTs for each tagged type which is local to | |
4307 | the formal parameter list of this FUNCTION_TYPE to point to | |
4308 | the FUNCTION_TYPE node itself. */ | |
4309 | ||
4310 | { | |
4311 | register tree link; | |
4312 | ||
4313 | for (link = current_function_parm_tags; | |
4314 | link; | |
4315 | link = TREE_CHAIN (link)) | |
4316 | TYPE_CONTEXT (TREE_VALUE (link)) = type; | |
4317 | } | |
4318 | } | |
4319 | else if (TREE_CODE (declarator) == INDIRECT_REF) | |
4320 | { | |
4321 | /* Merge any constancy or volatility into the target type | |
4322 | for the pointer. */ | |
4323 | ||
4324 | if (pedantic && TREE_CODE (type) == FUNCTION_TYPE | |
4325 | && (constp || volatilep)) | |
4326 | pedwarn ("ANSI C forbids const or volatile function types"); | |
4327 | if (constp || volatilep) | |
4328 | type = c_build_type_variant (type, constp, volatilep); | |
4329 | constp = 0; | |
4330 | volatilep = 0; | |
929f3671 | 4331 | size_varies = 0; |
51e29401 RS |
4332 | |
4333 | type = build_pointer_type (type); | |
4334 | ||
4335 | /* Process a list of type modifier keywords | |
4336 | (such as const or volatile) that were given inside the `*'. */ | |
4337 | ||
4338 | if (TREE_TYPE (declarator)) | |
4339 | { | |
4340 | register tree typemodlist; | |
4341 | int erred = 0; | |
4342 | for (typemodlist = TREE_TYPE (declarator); typemodlist; | |
4343 | typemodlist = TREE_CHAIN (typemodlist)) | |
4344 | { | |
4345 | if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST]) | |
4346 | constp++; | |
4347 | else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE]) | |
4348 | volatilep++; | |
4349 | else if (!erred) | |
4350 | { | |
4351 | erred = 1; | |
4352 | error ("invalid type modifier within pointer declarator"); | |
4353 | } | |
4354 | } | |
4355 | if (constp > 1) | |
47429a02 | 4356 | pedwarn ("duplicate `const'"); |
51e29401 | 4357 | if (volatilep > 1) |
47429a02 | 4358 | pedwarn ("duplicate `volatile'"); |
51e29401 RS |
4359 | } |
4360 | ||
4361 | declarator = TREE_OPERAND (declarator, 0); | |
4362 | } | |
4363 | else | |
4364 | abort (); | |
4365 | ||
4366 | } | |
4367 | ||
4368 | /* Now TYPE has the actual type. */ | |
4369 | ||
4370 | /* If this is declaring a typedef name, return a TYPE_DECL. */ | |
4371 | ||
4372 | if (specbits & (1 << (int) RID_TYPEDEF)) | |
4373 | { | |
4374 | tree decl; | |
4375 | /* Note that the grammar rejects storage classes | |
4376 | in typenames, fields or parameters */ | |
4377 | if (pedantic && TREE_CODE (type) == FUNCTION_TYPE | |
4378 | && (constp || volatilep)) | |
4379 | pedwarn ("ANSI C forbids const or volatile function types"); | |
4380 | if (constp || volatilep) | |
4381 | type = c_build_type_variant (type, constp, volatilep); | |
4382 | pop_obstacks (); | |
4383 | decl = build_decl (TYPE_DECL, declarator, type); | |
4384 | if ((specbits & (1 << (int) RID_SIGNED)) | |
4385 | || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))) | |
4386 | C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1; | |
4387 | return decl; | |
4388 | } | |
4389 | ||
4390 | /* Detect the case of an array type of unspecified size | |
4391 | which came, as such, direct from a typedef name. | |
4392 | We must copy the type, so that each identifier gets | |
4393 | a distinct type, so that each identifier's size can be | |
4394 | controlled separately by its own initializer. */ | |
4395 | ||
4396 | if (type != 0 && typedef_type != 0 | |
4397 | && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type) | |
4398 | && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0) | |
4399 | { | |
4400 | type = build_array_type (TREE_TYPE (type), 0); | |
929f3671 | 4401 | if (size_varies) |
51e29401 RS |
4402 | C_TYPE_VARIABLE_SIZE (type) = 1; |
4403 | } | |
4404 | ||
4405 | /* If this is a type name (such as, in a cast or sizeof), | |
4406 | compute the type and return it now. */ | |
4407 | ||
4408 | if (decl_context == TYPENAME) | |
4409 | { | |
4410 | /* Note that the grammar rejects storage classes | |
4411 | in typenames, fields or parameters */ | |
4412 | if (pedantic && TREE_CODE (type) == FUNCTION_TYPE | |
4413 | && (constp || volatilep)) | |
4414 | pedwarn ("ANSI C forbids const or volatile function types"); | |
4415 | if (constp || volatilep) | |
4416 | type = c_build_type_variant (type, constp, volatilep); | |
4417 | pop_obstacks (); | |
4418 | return type; | |
4419 | } | |
4420 | ||
4421 | /* `void' at top level (not within pointer) | |
4422 | is allowed only in typedefs or type names. | |
4423 | We don't complain about parms either, but that is because | |
4424 | a better error message can be made later. */ | |
4425 | ||
5fe86b8b | 4426 | if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM) |
51e29401 RS |
4427 | { |
4428 | error ("variable or field `%s' declared void", | |
4429 | IDENTIFIER_POINTER (declarator)); | |
4430 | type = integer_type_node; | |
4431 | } | |
4432 | ||
4433 | /* Now create the decl, which may be a VAR_DECL, a PARM_DECL | |
4434 | or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */ | |
4435 | ||
4436 | { | |
4437 | register tree decl; | |
4438 | ||
4439 | if (decl_context == PARM) | |
4440 | { | |
4441 | tree type_as_written = type; | |
90d56da8 | 4442 | tree main_type; |
51e29401 RS |
4443 | |
4444 | /* A parameter declared as an array of T is really a pointer to T. | |
4445 | One declared as a function is really a pointer to a function. */ | |
4446 | ||
4447 | if (TREE_CODE (type) == ARRAY_TYPE) | |
4448 | { | |
4449 | /* Transfer const-ness of array into that of type pointed to. */ | |
4450 | type = build_pointer_type | |
4451 | (c_build_type_variant (TREE_TYPE (type), constp, volatilep)); | |
4452 | volatilep = constp = 0; | |
929f3671 | 4453 | size_varies = 0; |
51e29401 RS |
4454 | } |
4455 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
4456 | { | |
4457 | if (pedantic && (constp || volatilep)) | |
4458 | pedwarn ("ANSI C forbids const or volatile function types"); | |
4459 | type = build_pointer_type (c_build_type_variant (type, constp, volatilep)); | |
4460 | volatilep = constp = 0; | |
4461 | } | |
4462 | ||
51e29401 | 4463 | decl = build_decl (PARM_DECL, declarator, type); |
929f3671 | 4464 | if (size_varies) |
51e29401 RS |
4465 | C_DECL_VARIABLE_SIZE (decl) = 1; |
4466 | ||
4467 | /* Compute the type actually passed in the parmlist, | |
4468 | for the case where there is no prototype. | |
4469 | (For example, shorts and chars are passed as ints.) | |
4470 | When there is a prototype, this is overridden later. */ | |
4471 | ||
4472 | DECL_ARG_TYPE (decl) = type; | |
f537a5c5 RS |
4473 | main_type = (type == error_mark_node |
4474 | ? error_mark_node | |
4475 | : TYPE_MAIN_VARIANT (type)); | |
90d56da8 | 4476 | if (main_type == float_type_node) |
51e29401 | 4477 | DECL_ARG_TYPE (decl) = double_type_node; |
13d39dbc | 4478 | /* Don't use TYPE_PRECISION to decide whether to promote, |
8eebb258 RS |
4479 | because we should convert short if it's the same size as int, |
4480 | but we should not convert long if it's the same size as int. */ | |
f537a5c5 RS |
4481 | else if (TREE_CODE (main_type) != ERROR_MARK |
4482 | && C_PROMOTING_INTEGER_TYPE_P (main_type)) | |
8eebb258 RS |
4483 | { |
4484 | if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node) | |
4485 | && TREE_UNSIGNED (type)) | |
4486 | DECL_ARG_TYPE (decl) = unsigned_type_node; | |
4487 | else | |
4488 | DECL_ARG_TYPE (decl) = integer_type_node; | |
4489 | } | |
51e29401 RS |
4490 | |
4491 | DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written; | |
4492 | } | |
4493 | else if (decl_context == FIELD) | |
4494 | { | |
4495 | /* Structure field. It may not be a function. */ | |
4496 | ||
4497 | if (TREE_CODE (type) == FUNCTION_TYPE) | |
4498 | { | |
4499 | error ("field `%s' declared as a function", | |
4500 | IDENTIFIER_POINTER (declarator)); | |
4501 | type = build_pointer_type (type); | |
4502 | } | |
4503 | else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0) | |
4504 | { | |
4505 | error ("field `%s' has incomplete type", | |
4506 | IDENTIFIER_POINTER (declarator)); | |
4507 | type = error_mark_node; | |
4508 | } | |
4509 | /* Move type qualifiers down to element of an array. */ | |
4510 | if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep)) | |
4511 | { | |
4512 | type = build_array_type (c_build_type_variant (TREE_TYPE (type), | |
4513 | constp, volatilep), | |
4514 | TYPE_DOMAIN (type)); | |
4515 | #if 0 /* Leave the field const or volatile as well. */ | |
4516 | constp = volatilep = 0; | |
4517 | #endif | |
4518 | } | |
4519 | decl = build_decl (FIELD_DECL, declarator, type); | |
929f3671 | 4520 | if (size_varies) |
51e29401 RS |
4521 | C_DECL_VARIABLE_SIZE (decl) = 1; |
4522 | } | |
4523 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
4524 | { | |
fd0b8fce JW |
4525 | /* Every function declaration is "external" |
4526 | except for those which are inside a function body | |
4527 | in which `auto' is used. | |
4528 | That is a case not specified by ANSI C, | |
4529 | and we use it for forward declarations for nested functions. */ | |
4530 | int extern_ref = (!(specbits & (1 << (int) RID_AUTO)) | |
4531 | || current_binding_level == global_binding_level); | |
4532 | ||
51e29401 RS |
4533 | if (specbits & (1 << (int) RID_AUTO) |
4534 | && (pedantic || current_binding_level == global_binding_level)) | |
4535 | pedwarn ("invalid storage class for function `%s'", | |
4536 | IDENTIFIER_POINTER (declarator)); | |
4537 | if (specbits & (1 << (int) RID_REGISTER)) | |
4538 | error ("invalid storage class for function `%s'", | |
4539 | IDENTIFIER_POINTER (declarator)); | |
4540 | /* Function declaration not at top level. | |
4541 | Storage classes other than `extern' are not allowed | |
4542 | and `extern' makes no difference. */ | |
4543 | if (current_binding_level != global_binding_level | |
4544 | && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE))) | |
4545 | && pedantic) | |
4546 | pedwarn ("invalid storage class for function `%s'", | |
4547 | IDENTIFIER_POINTER (declarator)); | |
fd0b8fce JW |
4548 | |
4549 | /* If this is a block level extern, it must live past the end | |
4550 | of the function so that we can check it against other | |
4551 | extern declarations (IDENTIFIER_LIMBO_VALUE). */ | |
4552 | if (extern_ref && allocation_temporary_p ()) | |
4553 | end_temporary_allocation (); | |
4554 | ||
51e29401 RS |
4555 | decl = build_decl (FUNCTION_DECL, declarator, type); |
4556 | ||
7a0347ff RS |
4557 | if (pedantic && (constp || volatilep) |
4558 | && ! DECL_IN_SYSTEM_HEADER (decl)) | |
51e29401 RS |
4559 | pedwarn ("ANSI C forbids const or volatile functions"); |
4560 | ||
fd0b8fce | 4561 | if (extern_ref) |
1394aabd | 4562 | DECL_EXTERNAL (decl) = 1; |
51e29401 RS |
4563 | /* Record absence of global scope for `static' or `auto'. */ |
4564 | TREE_PUBLIC (decl) | |
4565 | = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO))); | |
4566 | /* Record presence of `inline', if it is reasonable. */ | |
4567 | if (inlinep) | |
4568 | { | |
4569 | tree last = tree_last (TYPE_ARG_TYPES (type)); | |
4570 | ||
4571 | if (! strcmp (IDENTIFIER_POINTER (declarator), "main")) | |
4572 | warning ("cannot inline function `main'"); | |
5fe86b8b RS |
4573 | else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last)) |
4574 | != void_type_node)) | |
51e29401 RS |
4575 | warning ("inline declaration ignored for function with `...'"); |
4576 | else | |
4577 | /* Assume that otherwise the function can be inlined. */ | |
1394aabd | 4578 | DECL_INLINE (decl) = 1; |
51e29401 RS |
4579 | |
4580 | if (specbits & (1 << (int) RID_EXTERN)) | |
4581 | current_extern_inline = 1; | |
4582 | } | |
4583 | } | |
4584 | else | |
4585 | { | |
4586 | /* It's a variable. */ | |
fd0b8fce JW |
4587 | /* An uninitialized decl with `extern' is a reference. */ |
4588 | int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN)); | |
51e29401 RS |
4589 | |
4590 | /* Move type qualifiers down to element of an array. */ | |
4591 | if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep)) | |
4592 | { | |
4593 | type = build_array_type (c_build_type_variant (TREE_TYPE (type), | |
4594 | constp, volatilep), | |
4595 | TYPE_DOMAIN (type)); | |
4596 | #if 0 /* Leave the variable const or volatile as well. */ | |
4597 | constp = volatilep = 0; | |
4598 | #endif | |
4599 | } | |
4600 | ||
fd0b8fce JW |
4601 | /* If this is a block level extern, it must live past the end |
4602 | of the function so that we can check it against other | |
4603 | extern declarations (IDENTIFIER_LIMBO_VALUE). */ | |
4604 | if (extern_ref && allocation_temporary_p ()) | |
4605 | end_temporary_allocation (); | |
4606 | ||
51e29401 | 4607 | decl = build_decl (VAR_DECL, declarator, type); |
929f3671 | 4608 | if (size_varies) |
51e29401 RS |
4609 | C_DECL_VARIABLE_SIZE (decl) = 1; |
4610 | ||
4611 | if (inlinep) | |
4612 | pedwarn_with_decl (decl, "variable `%s' declared `inline'"); | |
4613 | ||
fd0b8fce | 4614 | DECL_EXTERNAL (decl) = extern_ref; |
ee534ebf RS |
4615 | /* At top level, the presence of a `static' or `register' storage |
4616 | class specifier, or the absence of all storage class specifiers | |
4617 | makes this declaration a definition (perhaps tentative). Also, | |
4618 | the absence of both `static' and `register' makes it public. */ | |
51e29401 RS |
4619 | if (current_binding_level == global_binding_level) |
4620 | { | |
ee534ebf RS |
4621 | TREE_PUBLIC (decl) |
4622 | = !(specbits | |
4623 | & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER))); | |
1394aabd | 4624 | TREE_STATIC (decl) = ! DECL_EXTERNAL (decl); |
51e29401 RS |
4625 | } |
4626 | /* Not at top level, only `static' makes a static definition. */ | |
4627 | else | |
4628 | { | |
4629 | TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0; | |
1394aabd | 4630 | TREE_PUBLIC (decl) = DECL_EXTERNAL (decl); |
51e29401 | 4631 | } |
519d591f RS |
4632 | |
4633 | if (specbits & 1 << (int) RID_ITERATOR) | |
4634 | ITERATOR_P (decl) = 1; | |
51e29401 RS |
4635 | } |
4636 | ||
4637 | /* Record `register' declaration for warnings on & | |
4638 | and in case doing stupid register allocation. */ | |
4639 | ||
4640 | if (specbits & (1 << (int) RID_REGISTER)) | |
1394aabd | 4641 | DECL_REGISTER (decl) = 1; |
51e29401 RS |
4642 | |
4643 | /* Record constancy and volatility. */ | |
4644 | ||
4645 | if (constp) | |
4646 | TREE_READONLY (decl) = 1; | |
4647 | if (volatilep) | |
4648 | { | |
4649 | TREE_SIDE_EFFECTS (decl) = 1; | |
4650 | TREE_THIS_VOLATILE (decl) = 1; | |
4651 | } | |
4652 | /* If a type has volatile components, it should be stored in memory. | |
4653 | Otherwise, the fact that those components are volatile | |
4654 | will be ignored, and would even crash the compiler. */ | |
4655 | if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))) | |
4656 | mark_addressable (decl); | |
4657 | ||
4658 | pop_obstacks (); | |
4659 | ||
4660 | return decl; | |
4661 | } | |
4662 | } | |
4663 | \f | |
51e29401 RS |
4664 | /* Decode the parameter-list info for a function type or function definition. |
4665 | The argument is the value returned by `get_parm_info' (or made in parse.y | |
4666 | if there is an identifier list instead of a parameter decl list). | |
4667 | These two functions are separate because when a function returns | |
4668 | or receives functions then each is called multiple times but the order | |
4669 | of calls is different. The last call to `grokparms' is always the one | |
4670 | that contains the formal parameter names of a function definition. | |
4671 | ||
4672 | Store in `last_function_parms' a chain of the decls of parms. | |
4673 | Also store in `last_function_parm_tags' a chain of the struct, union, | |
4674 | and enum tags declared among the parms. | |
4675 | ||
4676 | Return a list of arg types to use in the FUNCTION_TYPE for this function. | |
4677 | ||
4678 | FUNCDEF_FLAG is nonzero for a function definition, 0 for | |
4679 | a mere declaration. A nonempty identifier-list gets an error message | |
4680 | when FUNCDEF_FLAG is zero. */ | |
4681 | ||
4682 | static tree | |
4683 | grokparms (parms_info, funcdef_flag) | |
4684 | tree parms_info; | |
4685 | int funcdef_flag; | |
4686 | { | |
4687 | tree first_parm = TREE_CHAIN (parms_info); | |
4688 | ||
4689 | last_function_parms = TREE_PURPOSE (parms_info); | |
4690 | last_function_parm_tags = TREE_VALUE (parms_info); | |
4691 | ||
27f427f8 RS |
4692 | if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag |
4693 | && !in_system_header) | |
51e29401 RS |
4694 | warning ("function declaration isn't a prototype"); |
4695 | ||
4696 | if (first_parm != 0 | |
4697 | && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE) | |
4698 | { | |
4699 | if (! funcdef_flag) | |
4700 | pedwarn ("parameter names (without types) in function declaration"); | |
4701 | ||
4702 | last_function_parms = first_parm; | |
4703 | return 0; | |
4704 | } | |
4705 | else | |
4706 | { | |
4707 | tree parm; | |
4708 | tree typelt; | |
4709 | /* We no longer test FUNCDEF_FLAG. | |
4710 | If the arg types are incomplete in a declaration, | |
4711 | they must include undefined tags. | |
4712 | These tags can never be defined in the scope of the declaration, | |
4713 | so the types can never be completed, | |
4714 | and no call can be compiled successfully. */ | |
4715 | #if 0 | |
4716 | /* In a fcn definition, arg types must be complete. */ | |
4717 | if (funcdef_flag) | |
4718 | #endif | |
4719 | for (parm = last_function_parms, typelt = first_parm; | |
4720 | parm; | |
4721 | parm = TREE_CHAIN (parm)) | |
4722 | /* Skip over any enumeration constants declared here. */ | |
4723 | if (TREE_CODE (parm) == PARM_DECL) | |
4724 | { | |
4725 | /* Barf if the parameter itself has an incomplete type. */ | |
4726 | tree type = TREE_VALUE (typelt); | |
4727 | if (TYPE_SIZE (type) == 0) | |
4728 | { | |
4729 | if (funcdef_flag && DECL_NAME (parm) != 0) | |
4730 | error ("parameter `%s' has incomplete type", | |
4731 | IDENTIFIER_POINTER (DECL_NAME (parm))); | |
4732 | else | |
4733 | warning ("parameter has incomplete type"); | |
4734 | if (funcdef_flag) | |
4735 | { | |
4736 | TREE_VALUE (typelt) = error_mark_node; | |
4737 | TREE_TYPE (parm) = error_mark_node; | |
4738 | } | |
4739 | } | |
4740 | #if 0 /* This has been replaced by parm_tags_warning | |
4741 | which uses a more accurate criterion for what to warn about. */ | |
4742 | else | |
4743 | { | |
4744 | /* Now warn if is a pointer to an incomplete type. */ | |
4745 | while (TREE_CODE (type) == POINTER_TYPE | |
4746 | || TREE_CODE (type) == REFERENCE_TYPE) | |
4747 | type = TREE_TYPE (type); | |
4748 | type = TYPE_MAIN_VARIANT (type); | |
4749 | if (TYPE_SIZE (type) == 0) | |
4750 | { | |
4751 | if (DECL_NAME (parm) != 0) | |
4752 | warning ("parameter `%s' points to incomplete type", | |
4753 | IDENTIFIER_POINTER (DECL_NAME (parm))); | |
4754 | else | |
4755 | warning ("parameter points to incomplete type"); | |
4756 | } | |
4757 | } | |
4758 | #endif | |
4759 | typelt = TREE_CHAIN (typelt); | |
4760 | } | |
4761 | ||
023de292 | 4762 | /* Allocate the list of types the way we allocate a type. */ |
c47851dd | 4763 | if (first_parm && ! TREE_PERMANENT (first_parm)) |
023de292 RS |
4764 | { |
4765 | /* Construct a copy of the list of types | |
4766 | on the saveable obstack. */ | |
4767 | tree result = NULL; | |
4768 | for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt)) | |
4769 | result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt), | |
4770 | result); | |
4771 | return nreverse (result); | |
4772 | } | |
4773 | else | |
4774 | /* The list we have is permanent already. */ | |
4775 | return first_parm; | |
51e29401 RS |
4776 | } |
4777 | } | |
4778 | ||
4779 | ||
4780 | /* Return a tree_list node with info on a parameter list just parsed. | |
4781 | The TREE_PURPOSE is a chain of decls of those parms. | |
4782 | The TREE_VALUE is a list of structure, union and enum tags defined. | |
4783 | The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE. | |
4784 | This tree_list node is later fed to `grokparms'. | |
4785 | ||
4786 | VOID_AT_END nonzero means append `void' to the end of the type-list. | |
4787 | Zero means the parmlist ended with an ellipsis so don't append `void'. */ | |
4788 | ||
4789 | tree | |
4790 | get_parm_info (void_at_end) | |
4791 | int void_at_end; | |
4792 | { | |
4793 | register tree decl, t; | |
4794 | register tree types = 0; | |
4795 | int erred = 0; | |
4796 | tree tags = gettags (); | |
4797 | tree parms = getdecls (); | |
4798 | tree new_parms = 0; | |
4799 | tree order = current_binding_level->parm_order; | |
4800 | ||
4801 | /* Just `void' (and no ellipsis) is special. There are really no parms. */ | |
4802 | if (void_at_end && parms != 0 | |
4803 | && TREE_CHAIN (parms) == 0 | |
5fe86b8b | 4804 | && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node |
51e29401 RS |
4805 | && DECL_NAME (parms) == 0) |
4806 | { | |
4807 | parms = NULL_TREE; | |
4808 | storedecls (NULL_TREE); | |
4809 | return saveable_tree_cons (NULL_TREE, NULL_TREE, | |
4810 | saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE)); | |
4811 | } | |
4812 | ||
fc3ffe83 RK |
4813 | /* Extract enumerator values and other non-parms declared with the parms. |
4814 | Likewise any forward parm decls that didn't have real parm decls. */ | |
51e29401 RS |
4815 | for (decl = parms; decl; ) |
4816 | { | |
4817 | tree next = TREE_CHAIN (decl); | |
4818 | ||
e38e5ba8 | 4819 | if (TREE_CODE (decl) != PARM_DECL) |
fc3ffe83 | 4820 | { |
fc3ffe83 RK |
4821 | TREE_CHAIN (decl) = new_parms; |
4822 | new_parms = decl; | |
4823 | } | |
e38e5ba8 | 4824 | else if (TREE_ASM_WRITTEN (decl)) |
51e29401 | 4825 | { |
e38e5ba8 | 4826 | error_with_decl (decl, "parameter `%s' has just a forward declaration"); |
51e29401 RS |
4827 | TREE_CHAIN (decl) = new_parms; |
4828 | new_parms = decl; | |
4829 | } | |
4830 | decl = next; | |
4831 | } | |
4832 | ||
4833 | /* Put the parm decls back in the order they were in in the parm list. */ | |
4834 | for (t = order; t; t = TREE_CHAIN (t)) | |
4835 | { | |
4836 | if (TREE_CHAIN (t)) | |
4837 | TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t)); | |
4838 | else | |
4839 | TREE_CHAIN (TREE_VALUE (t)) = 0; | |
4840 | } | |
4841 | ||
4842 | new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0, | |
4843 | new_parms); | |
4844 | ||
4845 | /* Store the parmlist in the binding level since the old one | |
4846 | is no longer a valid list. (We have changed the chain pointers.) */ | |
4847 | storedecls (new_parms); | |
4848 | ||
4849 | for (decl = new_parms; decl; decl = TREE_CHAIN (decl)) | |
4850 | /* There may also be declarations for enumerators if an enumeration | |
4851 | type is declared among the parms. Ignore them here. */ | |
4852 | if (TREE_CODE (decl) == PARM_DECL) | |
4853 | { | |
4854 | /* Since there is a prototype, | |
4855 | args are passed in their declared types. */ | |
4856 | tree type = TREE_TYPE (decl); | |
4857 | DECL_ARG_TYPE (decl) = type; | |
4858 | #ifdef PROMOTE_PROTOTYPES | |
4859 | if (TREE_CODE (type) == INTEGER_TYPE | |
4860 | && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) | |
4861 | DECL_ARG_TYPE (decl) = integer_type_node; | |
4862 | #endif | |
4863 | ||
4864 | types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types); | |
5fe86b8b | 4865 | if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred |
51e29401 RS |
4866 | && DECL_NAME (decl) == 0) |
4867 | { | |
4868 | error ("`void' in parameter list must be the entire list"); | |
4869 | erred = 1; | |
4870 | } | |
4871 | } | |
4872 | ||
4873 | if (void_at_end) | |
4874 | return saveable_tree_cons (new_parms, tags, | |
4875 | nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types))); | |
4876 | ||
4877 | return saveable_tree_cons (new_parms, tags, nreverse (types)); | |
4878 | } | |
4879 | ||
4880 | /* At end of parameter list, warn about any struct, union or enum tags | |
4881 | defined within. Do so because these types cannot ever become complete. */ | |
4882 | ||
4883 | void | |
4884 | parmlist_tags_warning () | |
4885 | { | |
4886 | tree elt; | |
4887 | static int already; | |
4888 | ||
4889 | for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt)) | |
4890 | { | |
4891 | enum tree_code code = TREE_CODE (TREE_VALUE (elt)); | |
27301b30 RS |
4892 | /* An anonymous union parm type is meaningful as a GNU extension. |
4893 | So don't warn for that. */ | |
4894 | if (code == UNION_TYPE && !pedantic) | |
4895 | continue; | |
c138f328 RS |
4896 | if (TREE_PURPOSE (elt) != 0) |
4897 | warning ("`%s %s' declared inside parameter list", | |
4898 | (code == RECORD_TYPE ? "struct" | |
4899 | : code == UNION_TYPE ? "union" | |
4900 | : "enum"), | |
4901 | IDENTIFIER_POINTER (TREE_PURPOSE (elt))); | |
4902 | else | |
4903 | warning ("anonymous %s declared inside parameter list", | |
4904 | (code == RECORD_TYPE ? "struct" | |
4905 | : code == UNION_TYPE ? "union" | |
4906 | : "enum")); | |
4907 | ||
51e29401 RS |
4908 | if (! already) |
4909 | { | |
4910 | warning ("its scope is only this definition or declaration,"); | |
4911 | warning ("which is probably not what you want."); | |
4912 | already = 1; | |
4913 | } | |
4914 | } | |
4915 | } | |
4916 | \f | |
4917 | /* Get the struct, enum or union (CODE says which) with tag NAME. | |
4918 | Define the tag as a forward-reference if it is not defined. */ | |
4919 | ||
4920 | tree | |
4921 | xref_tag (code, name) | |
4922 | enum tree_code code; | |
4923 | tree name; | |
4924 | { | |
4925 | int temporary = allocation_temporary_p (); | |
4926 | ||
4927 | /* If a cross reference is requested, look up the type | |
4928 | already defined for this tag and return it. */ | |
4929 | ||
4930 | register tree ref = lookup_tag (code, name, current_binding_level, 0); | |
4931 | /* Even if this is the wrong type of tag, return what we found. | |
4932 | There will be an error message anyway, from pending_xref_error. | |
4933 | If we create an empty xref just for an invalid use of the type, | |
929f3671 | 4934 | the main result is to create lots of superfluous error messages. */ |
51e29401 RS |
4935 | if (ref) |
4936 | return ref; | |
4937 | ||
4938 | push_obstacks_nochange (); | |
4939 | ||
4940 | if (current_binding_level == global_binding_level && temporary) | |
4941 | end_temporary_allocation (); | |
4942 | ||
4943 | /* If no such tag is yet defined, create a forward-reference node | |
4944 | and record it as the "definition". | |
4945 | When a real declaration of this type is found, | |
4946 | the forward-reference will be altered into a real type. */ | |
4947 | ||
4948 | ref = make_node (code); | |
4949 | if (code == ENUMERAL_TYPE) | |
4950 | { | |
4951 | /* (In ANSI, Enums can be referred to only if already defined.) */ | |
4952 | if (pedantic) | |
4953 | pedwarn ("ANSI C forbids forward references to `enum' types"); | |
4954 | /* Give the type a default layout like unsigned int | |
4955 | to avoid crashing if it does not get defined. */ | |
4956 | TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node); | |
4957 | TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node); | |
4958 | TREE_UNSIGNED (ref) = 1; | |
4959 | TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node); | |
4960 | TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node); | |
4961 | TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node); | |
4962 | } | |
4963 | ||
4964 | pushtag (name, ref); | |
4965 | ||
4966 | pop_obstacks (); | |
4967 | ||
4968 | return ref; | |
4969 | } | |
4970 | \f | |
4971 | /* Make sure that the tag NAME is defined *in the current binding level* | |
4972 | at least as a forward reference. | |
7a0347ff RS |
4973 | CODE says which kind of tag NAME ought to be. |
4974 | ||
4975 | We also do a push_obstacks_nochange | |
4976 | whose matching pop is in finish_struct. */ | |
51e29401 RS |
4977 | |
4978 | tree | |
4979 | start_struct (code, name) | |
4980 | enum tree_code code; | |
4981 | tree name; | |
4982 | { | |
4983 | /* If there is already a tag defined at this binding level | |
4984 | (as a forward reference), just return it. */ | |
4985 | ||
4986 | register tree ref = 0; | |
4987 | ||
7a0347ff RS |
4988 | push_obstacks_nochange (); |
4989 | if (current_binding_level == global_binding_level) | |
4990 | end_temporary_allocation (); | |
4991 | ||
51e29401 RS |
4992 | if (name != 0) |
4993 | ref = lookup_tag (code, name, current_binding_level, 1); | |
4994 | if (ref && TREE_CODE (ref) == code) | |
4995 | { | |
4996 | C_TYPE_BEING_DEFINED (ref) = 1; | |
4997 | if (TYPE_FIELDS (ref)) | |
4998 | error ((code == UNION_TYPE ? "redefinition of `union %s'" | |
4999 | : "redefinition of `struct %s'"), | |
5000 | IDENTIFIER_POINTER (name)); | |
5001 | ||
5002 | return ref; | |
5003 | } | |
5004 | ||
5005 | /* Otherwise create a forward-reference just so the tag is in scope. */ | |
5006 | ||
5007 | ref = make_node (code); | |
5008 | pushtag (name, ref); | |
5009 | C_TYPE_BEING_DEFINED (ref) = 1; | |
5010 | return ref; | |
5011 | } | |
5012 | ||
5013 | /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted) | |
5014 | of a structure component, returning a FIELD_DECL node. | |
5015 | WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. | |
5016 | ||
5017 | This is done during the parsing of the struct declaration. | |
5018 | The FIELD_DECL nodes are chained together and the lot of them | |
5019 | are ultimately passed to `build_struct' to make the RECORD_TYPE node. */ | |
5020 | ||
5021 | tree | |
5022 | grokfield (filename, line, declarator, declspecs, width) | |
5023 | char *filename; | |
5024 | int line; | |
5025 | tree declarator, declspecs, width; | |
5026 | { | |
5027 | tree value; | |
5028 | ||
5029 | /* The corresponding pop_obstacks is in finish_decl. */ | |
5030 | push_obstacks_nochange (); | |
5031 | ||
5032 | value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0); | |
5033 | ||
8d9bfdc5 | 5034 | finish_decl (value, NULL_TREE, NULL_TREE); |
51e29401 RS |
5035 | DECL_INITIAL (value) = width; |
5036 | ||
abe31bf8 | 5037 | maybe_objc_check_decl (value); |
51e29401 RS |
5038 | return value; |
5039 | } | |
5040 | \f | |
5041 | /* Function to help qsort sort FIELD_DECLs by name order. */ | |
5042 | ||
5043 | static int | |
5044 | field_decl_cmp (x, y) | |
5045 | tree *x, *y; | |
5046 | { | |
5047 | return (long)DECL_NAME (*x) - (long)DECL_NAME (*y); | |
5048 | } | |
5049 | ||
5050 | /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T. | |
7a0347ff RS |
5051 | FIELDLIST is a chain of FIELD_DECL nodes for the fields. |
5052 | ||
5053 | We also do a pop_obstacks to match the push in start_struct. */ | |
51e29401 RS |
5054 | |
5055 | tree | |
5056 | finish_struct (t, fieldlist) | |
5057 | register tree t, fieldlist; | |
5058 | { | |
5059 | register tree x; | |
5060 | int old_momentary; | |
5061 | int toplevel = global_binding_level == current_binding_level; | |
5062 | ||
5063 | /* If this type was previously laid out as a forward reference, | |
5064 | make sure we lay it out again. */ | |
5065 | ||
5066 | TYPE_SIZE (t) = 0; | |
5067 | ||
5068 | /* Nameless union parm types are useful as GCC extension. */ | |
5069 | if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic) | |
5070 | /* Otherwise, warn about any struct or union def. in parmlist. */ | |
5071 | if (in_parm_level_p ()) | |
5072 | { | |
5073 | if (pedantic) | |
5074 | pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms" | |
5075 | : "structure defined inside parms")); | |
f3c2c111 | 5076 | else if (! flag_traditional) |
51e29401 RS |
5077 | warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms" |
5078 | : "structure defined inside parms")); | |
5079 | } | |
5080 | ||
5081 | old_momentary = suspend_momentary (); | |
5082 | ||
5083 | if (fieldlist == 0 && pedantic) | |
5084 | pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union has no members" | |
5085 | : "structure has no members")); | |
5086 | ||
5087 | /* Install struct as DECL_CONTEXT of each field decl. | |
5088 | Also process specified field sizes. | |
77f934bb | 5089 | Set DECL_FIELD_SIZE to the specified size, or 0 if none specified. |
51e29401 RS |
5090 | The specified size is found in the DECL_INITIAL. |
5091 | Store 0 there, except for ": 0" fields (so we can find them | |
5092 | and delete them, below). */ | |
5093 | ||
5094 | for (x = fieldlist; x; x = TREE_CHAIN (x)) | |
5095 | { | |
5096 | DECL_CONTEXT (x) = t; | |
77f934bb | 5097 | DECL_FIELD_SIZE (x) = 0; |
51e29401 RS |
5098 | |
5099 | /* If any field is const, the structure type is pseudo-const. */ | |
5100 | if (TREE_READONLY (x)) | |
5101 | C_TYPE_FIELDS_READONLY (t) = 1; | |
5102 | else | |
5103 | { | |
5104 | /* A field that is pseudo-const makes the structure likewise. */ | |
5105 | tree t1 = TREE_TYPE (x); | |
5106 | while (TREE_CODE (t1) == ARRAY_TYPE) | |
5107 | t1 = TREE_TYPE (t1); | |
5108 | if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE) | |
5109 | && C_TYPE_FIELDS_READONLY (t1)) | |
5110 | C_TYPE_FIELDS_READONLY (t) = 1; | |
5111 | } | |
5112 | ||
5113 | /* Any field that is volatile means variables of this type must be | |
5114 | treated in some ways as volatile. */ | |
5115 | if (TREE_THIS_VOLATILE (x)) | |
5116 | C_TYPE_FIELDS_VOLATILE (t) = 1; | |
5117 | ||
5118 | /* Any field of nominal variable size implies structure is too. */ | |
5119 | if (C_DECL_VARIABLE_SIZE (x)) | |
5120 | C_TYPE_VARIABLE_SIZE (t) = 1; | |
5121 | ||
8d7bbe5f RS |
5122 | /* Detect invalid nested redefinition. */ |
5123 | if (TREE_TYPE (x) == t) | |
5124 | error ("nested redefinition of `%s'", | |
5125 | IDENTIFIER_POINTER (TYPE_NAME (t))); | |
5126 | ||
51e29401 | 5127 | /* Detect invalid bit-field size. */ |
07c5ab55 RS |
5128 | if (DECL_INITIAL (x)) |
5129 | STRIP_NOPS (DECL_INITIAL (x)); | |
90374cc2 | 5130 | if (DECL_INITIAL (x)) |
e681c5a1 RS |
5131 | { |
5132 | if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST) | |
5133 | constant_expression_warning (DECL_INITIAL (x)); | |
5134 | else | |
5135 | { | |
5136 | error_with_decl (x, "bit-field `%s' width not an integer constant"); | |
5137 | DECL_INITIAL (x) = NULL; | |
5138 | } | |
5139 | } | |
51e29401 RS |
5140 | |
5141 | /* Detect invalid bit-field type. */ | |
5142 | if (DECL_INITIAL (x) | |
5143 | && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE | |
5144 | && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE) | |
5145 | { | |
5146 | error_with_decl (x, "bit-field `%s' has invalid type"); | |
5147 | DECL_INITIAL (x) = NULL; | |
5148 | } | |
5149 | if (DECL_INITIAL (x) && pedantic | |
5150 | && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node | |
5151 | && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node) | |
5152 | pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C"); | |
5153 | ||
5154 | /* Detect and ignore out of range field width. */ | |
5155 | if (DECL_INITIAL (x)) | |
5156 | { | |
2d724389 | 5157 | unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x)); |
51e29401 | 5158 | |
2d724389 | 5159 | if (tree_int_cst_lt (DECL_INITIAL (x), integer_zero_node)) |
51e29401 RS |
5160 | { |
5161 | DECL_INITIAL (x) = NULL; | |
5162 | error_with_decl (x, "negative width in bit-field `%s'"); | |
5163 | } | |
2d724389 RS |
5164 | else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0 |
5165 | || width > TYPE_PRECISION (TREE_TYPE (x))) | |
51e29401 | 5166 | { |
51e29401 | 5167 | DECL_INITIAL (x) = NULL; |
2d724389 | 5168 | pedwarn_with_decl (x, "width of `%s' exceeds its type"); |
51e29401 | 5169 | } |
2d724389 | 5170 | else if (width == 0 && DECL_NAME (x) != 0) |
51e29401 | 5171 | { |
2d724389 | 5172 | error_with_decl (x, "zero width for bit-field `%s'"); |
51e29401 | 5173 | DECL_INITIAL (x) = NULL; |
51e29401 RS |
5174 | } |
5175 | } | |
5176 | ||
5177 | /* Process valid field width. */ | |
5178 | if (DECL_INITIAL (x)) | |
5179 | { | |
5180 | register int width = TREE_INT_CST_LOW (DECL_INITIAL (x)); | |
5181 | ||
77f934bb | 5182 | DECL_FIELD_SIZE (x) = width; |
51e29401 RS |
5183 | DECL_BIT_FIELD (x) = 1; |
5184 | DECL_INITIAL (x) = NULL; | |
5185 | ||
5186 | if (width == 0) | |
5187 | { | |
5188 | /* field size 0 => force desired amount of alignment. */ | |
5189 | #ifdef EMPTY_FIELD_BOUNDARY | |
5190 | DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY); | |
5191 | #endif | |
5192 | #ifdef PCC_BITFIELD_TYPE_MATTERS | |
5193 | DECL_ALIGN (x) = MAX (DECL_ALIGN (x), | |
5194 | TYPE_ALIGN (TREE_TYPE (x))); | |
5195 | #endif | |
5196 | } | |
5197 | } | |
5198 | else | |
ec2343c4 MM |
5199 | { |
5200 | int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT | |
5201 | : TYPE_ALIGN (TREE_TYPE (x))); | |
5202 | /* Non-bit-fields are aligned for their type, except packed | |
5203 | fields which require only BITS_PER_UNIT alignment. */ | |
5204 | DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align); | |
5205 | } | |
51e29401 RS |
5206 | } |
5207 | ||
5208 | /* Now DECL_INITIAL is null on all members. */ | |
5209 | ||
5210 | /* Delete all duplicate fields from the fieldlist */ | |
5211 | for (x = fieldlist; x && TREE_CHAIN (x);) | |
5212 | /* Anonymous fields aren't duplicates. */ | |
5213 | if (DECL_NAME (TREE_CHAIN (x)) == 0) | |
5214 | x = TREE_CHAIN (x); | |
5215 | else | |
5216 | { | |
5217 | register tree y = fieldlist; | |
5218 | ||
5219 | while (1) | |
5220 | { | |
5221 | if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x))) | |
5222 | break; | |
5223 | if (y == x) | |
5224 | break; | |
5225 | y = TREE_CHAIN (y); | |
5226 | } | |
5227 | if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x))) | |
5228 | { | |
5229 | error_with_decl (TREE_CHAIN (x), "duplicate member `%s'"); | |
5230 | TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x)); | |
5231 | } | |
5232 | else x = TREE_CHAIN (x); | |
5233 | } | |
5234 | ||
5235 | /* Now we have the nearly final fieldlist. Record it, | |
5236 | then lay out the structure or union (including the fields). */ | |
5237 | ||
5238 | TYPE_FIELDS (t) = fieldlist; | |
5239 | ||
5240 | layout_type (t); | |
5241 | ||
5242 | /* Delete all zero-width bit-fields from the front of the fieldlist */ | |
5243 | while (fieldlist | |
5244 | && DECL_INITIAL (fieldlist)) | |
5245 | fieldlist = TREE_CHAIN (fieldlist); | |
5246 | /* Delete all such members from the rest of the fieldlist */ | |
5247 | for (x = fieldlist; x;) | |
5248 | { | |
5249 | if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x))) | |
5250 | TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x)); | |
5251 | else x = TREE_CHAIN (x); | |
5252 | } | |
5253 | ||
5254 | /* Now we have the truly final field list. | |
5255 | Store it in this type and in the variants. */ | |
5256 | ||
5257 | TYPE_FIELDS (t) = fieldlist; | |
5258 | ||
5259 | /* If there are lots of fields, sort so we can look through them fast. | |
5260 | We arbitrarily consider 16 or more elts to be "a lot". */ | |
5261 | { | |
5262 | int len = 0; | |
5263 | ||
5264 | for (x = fieldlist; x; x = TREE_CHAIN (x)) | |
5265 | { | |
5266 | if (len > 15) | |
5267 | break; | |
5268 | len += 1; | |
5269 | } | |
5270 | if (len > 15) | |
5271 | { | |
5272 | tree *field_array; | |
5273 | char *space; | |
5274 | ||
5275 | len += list_length (x); | |
5276 | /* Use the same allocation policy here that make_node uses, to | |
5277 | ensure that this lives as long as the rest of the struct decl. | |
5278 | All decls in an inline function need to be saved. */ | |
5279 | if (allocation_temporary_p ()) | |
5280 | space = savealloc (sizeof (struct lang_type) + len * sizeof (tree)); | |
5281 | else | |
5282 | space = oballoc (sizeof (struct lang_type) + len * sizeof (tree)); | |
5283 | ||
5284 | TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space; | |
5285 | TYPE_LANG_SPECIFIC (t)->len = len; | |
5286 | ||
5287 | field_array = &TYPE_LANG_SPECIFIC (t)->elts[0]; | |
5288 | len = 0; | |
5289 | for (x = fieldlist; x; x = TREE_CHAIN (x)) | |
5290 | field_array[len++] = x; | |
5291 | ||
5292 | qsort (field_array, len, sizeof (tree), field_decl_cmp); | |
5293 | } | |
5294 | } | |
5295 | ||
5296 | for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x)) | |
5297 | { | |
5298 | TYPE_FIELDS (x) = TYPE_FIELDS (t); | |
5299 | TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t); | |
5300 | TYPE_ALIGN (x) = TYPE_ALIGN (t); | |
5301 | } | |
5302 | ||
5303 | /* Promote each bit-field's type to int if it is narrower than that. */ | |
5304 | for (x = fieldlist; x; x = TREE_CHAIN (x)) | |
5305 | if (DECL_BIT_FIELD (x) | |
06038f12 RS |
5306 | && (C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x)) |
5307 | || DECL_FIELD_SIZE (x) < TYPE_PRECISION (integer_type_node))) | |
5308 | { | |
5309 | tree type = TREE_TYPE (x); | |
5310 | ||
5311 | /* Preserve unsignedness if traditional | |
5312 | or if not really getting any wider. */ | |
5313 | if (TREE_UNSIGNED (type) | |
5314 | && (flag_traditional | |
5315 | || | |
5316 | (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node) | |
5317 | && | |
5318 | DECL_FIELD_SIZE (x) == TYPE_PRECISION (integer_type_node)))) | |
5319 | TREE_TYPE (x) = unsigned_type_node; | |
5320 | else | |
5321 | TREE_TYPE (x) = integer_type_node; | |
5322 | } | |
51e29401 RS |
5323 | |
5324 | /* If this structure or union completes the type of any previous | |
5325 | variable declaration, lay it out and output its rtl. */ | |
5326 | ||
5327 | if (current_binding_level->n_incomplete != 0) | |
5328 | { | |
5329 | tree decl; | |
5330 | for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl)) | |
5331 | { | |
5332 | if (TREE_TYPE (decl) == t | |
5333 | && TREE_CODE (decl) != TYPE_DECL) | |
5334 | { | |
5335 | layout_decl (decl, 0); | |
5336 | /* This is a no-op in c-lang.c or something real in objc-actions.c. */ | |
5337 | maybe_objc_check_decl (decl); | |
8d9bfdc5 | 5338 | rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0); |
51e29401 RS |
5339 | if (! toplevel) |
5340 | expand_decl (decl); | |
5341 | --current_binding_level->n_incomplete; | |
5342 | } | |
5343 | else if (TYPE_SIZE (TREE_TYPE (decl)) == 0 | |
5344 | && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE) | |
5345 | { | |
5346 | tree element = TREE_TYPE (decl); | |
5347 | while (TREE_CODE (element) == ARRAY_TYPE) | |
5348 | element = TREE_TYPE (element); | |
5349 | if (element == t) | |
5350 | layout_array_type (TREE_TYPE (decl)); | |
5351 | } | |
5352 | } | |
5353 | } | |
5354 | ||
5355 | resume_momentary (old_momentary); | |
5356 | ||
5357 | /* Finish debugging output for this type. */ | |
5358 | rest_of_type_compilation (t, toplevel); | |
5359 | ||
7a0347ff RS |
5360 | /* The matching push is in start_struct. */ |
5361 | pop_obstacks (); | |
5362 | ||
51e29401 RS |
5363 | return t; |
5364 | } | |
5365 | ||
5366 | /* Lay out the type T, and its element type, and so on. */ | |
5367 | ||
5368 | static void | |
5369 | layout_array_type (t) | |
5370 | tree t; | |
5371 | { | |
5372 | if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE) | |
5373 | layout_array_type (TREE_TYPE (t)); | |
5374 | layout_type (t); | |
5375 | } | |
5376 | \f | |
5377 | /* Begin compiling the definition of an enumeration type. | |
5378 | NAME is its name (or null if anonymous). | |
5379 | Returns the type object, as yet incomplete. | |
5380 | Also records info about it so that build_enumerator | |
5381 | may be used to declare the individual values as they are read. */ | |
5382 | ||
5383 | tree | |
5384 | start_enum (name) | |
5385 | tree name; | |
5386 | { | |
5387 | register tree enumtype = 0; | |
5388 | ||
5389 | /* If this is the real definition for a previous forward reference, | |
5390 | fill in the contents in the same object that used to be the | |
5391 | forward reference. */ | |
5392 | ||
5393 | if (name != 0) | |
5394 | enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1); | |
5395 | ||
7a0347ff RS |
5396 | /* The corresponding pop_obstacks is in finish_enum. */ |
5397 | push_obstacks_nochange (); | |
5398 | /* If these symbols and types are global, make them permanent. */ | |
5399 | if (current_binding_level == global_binding_level) | |
5400 | end_temporary_allocation (); | |
5401 | ||
51e29401 RS |
5402 | if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE) |
5403 | { | |
5404 | enumtype = make_node (ENUMERAL_TYPE); | |
5405 | pushtag (name, enumtype); | |
5406 | } | |
5407 | ||
5408 | C_TYPE_BEING_DEFINED (enumtype) = 1; | |
5409 | ||
5410 | if (TYPE_VALUES (enumtype) != 0) | |
5411 | { | |
5412 | /* This enum is a named one that has been declared already. */ | |
5413 | error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name)); | |
5414 | ||
5415 | /* Completely replace its old definition. | |
5416 | The old enumerators remain defined, however. */ | |
5417 | TYPE_VALUES (enumtype) = 0; | |
5418 | } | |
5419 | ||
5420 | enum_next_value = integer_zero_node; | |
93e3ba4f | 5421 | enum_overflow = 0; |
51e29401 RS |
5422 | |
5423 | return enumtype; | |
5424 | } | |
5425 | ||
5426 | /* After processing and defining all the values of an enumeration type, | |
5427 | install their decls in the enumeration type and finish it off. | |
5428 | ENUMTYPE is the type object and VALUES a list of decl-value pairs. | |
5429 | Returns ENUMTYPE. */ | |
5430 | ||
5431 | tree | |
5432 | finish_enum (enumtype, values) | |
5433 | register tree enumtype, values; | |
5434 | { | |
fbe23ee7 | 5435 | register tree pair, tem; |
51e29401 | 5436 | tree minnode = 0, maxnode = 0; |
8d9bfdc5 RK |
5437 | register HOST_WIDE_INT maxvalue = 0; |
5438 | register HOST_WIDE_INT minvalue = 0; | |
51e29401 RS |
5439 | register int i; |
5440 | unsigned precision = 0; | |
5441 | int toplevel = global_binding_level == current_binding_level; | |
7a0347ff | 5442 | int temporary = allocation_temporary_p (); |
51e29401 RS |
5443 | |
5444 | if (in_parm_level_p ()) | |
5445 | warning ("enum defined inside parms"); | |
5446 | ||
5447 | /* Calculate the maximum value of any enumerator in this type. */ | |
5448 | ||
5449 | for (pair = values; pair; pair = TREE_CHAIN (pair)) | |
5450 | { | |
5451 | tree value = TREE_VALUE (pair); | |
5452 | if (pair == values) | |
5453 | minnode = maxnode = TREE_VALUE (pair); | |
5454 | else | |
5455 | { | |
5456 | if (tree_int_cst_lt (maxnode, value)) | |
5457 | maxnode = value; | |
5458 | if (tree_int_cst_lt (value, minnode)) | |
5459 | minnode = value; | |
5460 | } | |
5461 | } | |
5462 | ||
5463 | TYPE_MIN_VALUE (enumtype) = minnode; | |
5464 | TYPE_MAX_VALUE (enumtype) = maxnode; | |
5465 | ||
5466 | /* Determine the precision this type needs. */ | |
5467 | ||
5468 | if (TREE_INT_CST_HIGH (minnode) >= 0 | |
5469 | ? tree_int_cst_lt (TYPE_MAX_VALUE (unsigned_type_node), maxnode) | |
5470 | : (tree_int_cst_lt (minnode, TYPE_MIN_VALUE (integer_type_node)) | |
5471 | || tree_int_cst_lt (TYPE_MAX_VALUE (integer_type_node), maxnode))) | |
5472 | precision = TYPE_PRECISION (long_long_integer_type_node); | |
5473 | else | |
5474 | { | |
8d9bfdc5 RK |
5475 | maxvalue = TREE_INT_CST_LOW (maxnode); |
5476 | minvalue = TREE_INT_CST_LOW (minnode); | |
51e29401 RS |
5477 | |
5478 | if (maxvalue > 0) | |
5479 | precision = floor_log2 (maxvalue) + 1; | |
5480 | if (minvalue < 0) | |
5481 | { | |
5482 | /* Compute number of bits to represent magnitude of a negative value. | |
5483 | Add one to MINVALUE since range of negative numbers | |
5484 | includes the power of two. */ | |
5485 | unsigned negprecision = floor_log2 (-minvalue - 1) + 1; | |
5486 | if (negprecision > precision) | |
5487 | precision = negprecision; | |
5488 | precision += 1; /* room for sign bit */ | |
5489 | } | |
5490 | ||
5491 | if (!precision) | |
5492 | precision = 1; | |
5493 | } | |
5494 | ||
5495 | if (flag_short_enums || precision > TYPE_PRECISION (integer_type_node)) | |
5496 | /* Use the width of the narrowest normal C type which is wide enough. */ | |
5497 | TYPE_PRECISION (enumtype) = TYPE_PRECISION (type_for_size (precision, 1)); | |
5498 | else | |
5499 | TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node); | |
5500 | ||
5501 | TYPE_SIZE (enumtype) = 0; | |
5502 | layout_type (enumtype); | |
5503 | ||
5504 | /* An enum can have some negative values; then it is signed. */ | |
5505 | TREE_UNSIGNED (enumtype) = ! tree_int_cst_lt (minnode, integer_zero_node); | |
5506 | ||
5507 | /* If the enumerators might not fit in an int, change their type now. */ | |
5508 | /* It seems more useful in the debugger to leave these as int | |
5509 | unless the enumerator is wider than int. */ | |
5510 | if (TYPE_PRECISION (enumtype) <= TYPE_PRECISION (integer_type_node)) | |
5511 | for (pair = values; pair; pair = TREE_CHAIN (pair)) | |
5512 | { | |
5513 | TREE_TYPE (TREE_PURPOSE (pair)) = enumtype; | |
5514 | DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype); | |
ec2343c4 MM |
5515 | if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL) |
5516 | DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype); | |
51e29401 RS |
5517 | } |
5518 | ||
5519 | /* Replace the decl nodes in VALUES with their names. */ | |
5520 | for (pair = values; pair; pair = TREE_CHAIN (pair)) | |
5521 | TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair)); | |
5522 | ||
5523 | TYPE_VALUES (enumtype) = values; | |
5524 | ||
fbe23ee7 RS |
5525 | /* Fix up all variant types of this enum type. */ |
5526 | for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem)) | |
5527 | { | |
5528 | TYPE_VALUES (tem) = TYPE_VALUES (enumtype); | |
5529 | TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype); | |
5530 | TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype); | |
5531 | TYPE_SIZE (tem) = TYPE_SIZE (enumtype); | |
5532 | TYPE_MODE (tem) = TYPE_MODE (enumtype); | |
5533 | TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype); | |
5534 | TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype); | |
5535 | TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype); | |
5536 | } | |
5537 | ||
51e29401 RS |
5538 | /* Finish debugging output for this type. */ |
5539 | rest_of_type_compilation (enumtype, toplevel); | |
5540 | ||
7a0347ff RS |
5541 | /* This matches a push in start_enum. */ |
5542 | pop_obstacks (); | |
5543 | ||
51e29401 RS |
5544 | return enumtype; |
5545 | } | |
5546 | ||
5547 | /* Build and install a CONST_DECL for one value of the | |
5548 | current enumeration type (one that was begun with start_enum). | |
5549 | Return a tree-list containing the CONST_DECL and its value. | |
5550 | Assignment of sequential values by default is handled here. */ | |
5551 | ||
5552 | tree | |
5553 | build_enumerator (name, value) | |
5554 | tree name, value; | |
5555 | { | |
5556 | register tree decl; | |
5557 | ||
5558 | /* Validate and default VALUE. */ | |
5559 | ||
5560 | /* Remove no-op casts from the value. */ | |
cd7a1451 | 5561 | if (value) |
874a7be1 | 5562 | STRIP_TYPE_NOPS (value); |
51e29401 | 5563 | |
90374cc2 | 5564 | if (value != 0) |
e681c5a1 RS |
5565 | { |
5566 | if (TREE_CODE (value) == INTEGER_CST) | |
5567 | constant_expression_warning (value); | |
5568 | else | |
5569 | { | |
5570 | error ("enumerator value for `%s' not integer constant", | |
5571 | IDENTIFIER_POINTER (name)); | |
5572 | value = 0; | |
5573 | } | |
5574 | } | |
51e29401 RS |
5575 | |
5576 | /* Default based on previous value. */ | |
5577 | /* It should no longer be possible to have NON_LVALUE_EXPR | |
5578 | in the default. */ | |
5579 | if (value == 0) | |
93e3ba4f RS |
5580 | { |
5581 | value = enum_next_value; | |
5582 | if (enum_overflow) | |
5583 | error ("overflow in enumeration values"); | |
5584 | } | |
51e29401 RS |
5585 | |
5586 | if (pedantic && ! int_fits_type_p (value, integer_type_node)) | |
5587 | { | |
5588 | pedwarn ("ANSI C restricts enumerator values to range of `int'"); | |
5589 | value = integer_zero_node; | |
5590 | } | |
5591 | ||
5592 | /* Set basis for default for next value. */ | |
5593 | enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0); | |
93e3ba4f | 5594 | enum_overflow = tree_int_cst_lt (enum_next_value, value); |
51e29401 RS |
5595 | |
5596 | /* Now create a declaration for the enum value name. */ | |
5597 | ||
5598 | decl = build_decl (CONST_DECL, name, integer_type_node); | |
5599 | DECL_INITIAL (decl) = value; | |
5600 | TREE_TYPE (value) = integer_type_node; | |
5601 | pushdecl (decl); | |
5602 | ||
8d9bfdc5 | 5603 | return saveable_tree_cons (decl, value, NULL_TREE); |
51e29401 RS |
5604 | } |
5605 | \f | |
5606 | /* Create the FUNCTION_DECL for a function definition. | |
5607 | DECLSPECS and DECLARATOR are the parts of the declaration; | |
5608 | they describe the function's name and the type it returns, | |
5609 | but twisted together in a fashion that parallels the syntax of C. | |
5610 | ||
5611 | This function creates a binding context for the function body | |
5612 | as well as setting up the FUNCTION_DECL in current_function_decl. | |
5613 | ||
5614 | Returns 1 on success. If the DECLARATOR is not suitable for a function | |
5615 | (it defines a datum instead), we return 0, which tells | |
5616 | yyparse to report a parse error. | |
5617 | ||
5618 | NESTED is nonzero for a function nested within another function. */ | |
5619 | ||
5620 | int | |
5621 | start_function (declspecs, declarator, nested) | |
5622 | tree declarator, declspecs; | |
5623 | int nested; | |
5624 | { | |
5625 | tree decl1, old_decl; | |
5626 | tree restype; | |
5627 | ||
5628 | current_function_returns_value = 0; /* Assume, until we see it does. */ | |
5629 | current_function_returns_null = 0; | |
5630 | warn_about_return_type = 0; | |
5631 | current_extern_inline = 0; | |
5632 | c_function_varargs = 0; | |
5633 | named_labels = 0; | |
5634 | shadowed_labels = 0; | |
5635 | ||
5636 | decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1); | |
5637 | ||
5638 | /* If the declarator is not suitable for a function definition, | |
5639 | cause a syntax error. */ | |
5640 | if (decl1 == 0) | |
5641 | return 0; | |
5642 | ||
5643 | announce_function (decl1); | |
5644 | ||
5645 | if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0) | |
5646 | { | |
5647 | error ("return-type is an incomplete type"); | |
5648 | /* Make it return void instead. */ | |
5649 | TREE_TYPE (decl1) | |
5650 | = build_function_type (void_type_node, | |
5651 | TYPE_ARG_TYPES (TREE_TYPE (decl1))); | |
5652 | } | |
5653 | ||
5654 | if (warn_about_return_type) | |
5655 | warning ("return-type defaults to `int'"); | |
5656 | ||
5657 | /* Save the parm names or decls from this function's declarator | |
5658 | where store_parm_decls will find them. */ | |
5659 | current_function_parms = last_function_parms; | |
5660 | current_function_parm_tags = last_function_parm_tags; | |
5661 | ||
5662 | /* Make the init_value nonzero so pushdecl knows this is not tentative. | |
5663 | error_mark_node is replaced below (in poplevel) with the BLOCK. */ | |
5664 | DECL_INITIAL (decl1) = error_mark_node; | |
5665 | ||
5666 | /* If this definition isn't a prototype and we had a prototype declaration | |
5667 | before, copy the arg type info from that prototype. | |
5668 | But not if what we had before was a builtin function. */ | |
5669 | old_decl = lookup_name_current_level (DECL_NAME (decl1)); | |
5670 | if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE | |
5671 | && !DECL_BUILT_IN (old_decl) | |
fa7d8b92 RK |
5672 | && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1))) |
5673 | == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl)))) | |
51e29401 | 5674 | && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0) |
50a9145c JW |
5675 | { |
5676 | TREE_TYPE (decl1) = TREE_TYPE (old_decl); | |
5677 | current_function_prototype_file = DECL_SOURCE_FILE (old_decl); | |
5678 | current_function_prototype_line = DECL_SOURCE_LINE (old_decl); | |
5679 | } | |
51e29401 RS |
5680 | |
5681 | /* Optionally warn of old-fashioned def with no previous prototype. */ | |
5682 | if (warn_strict_prototypes | |
5683 | && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0 | |
5684 | && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)) | |
5685 | warning ("function declaration isn't a prototype"); | |
5686 | /* Optionally warn of any global def with no previous prototype. */ | |
5687 | else if (warn_missing_prototypes | |
5688 | && TREE_PUBLIC (decl1) | |
39ab948e RS |
5689 | && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0) |
5690 | && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1)))) | |
51e29401 RS |
5691 | warning_with_decl (decl1, "no previous prototype for `%s'"); |
5692 | /* Optionally warn of any def with no previous prototype | |
5693 | if the function has already been used. */ | |
5694 | else if (warn_missing_prototypes | |
5695 | && old_decl != 0 && TREE_USED (old_decl) | |
5696 | && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)) | |
5697 | warning_with_decl (decl1, "`%s' was used with no prototype before its definition"); | |
5698 | ||
5699 | /* This is a definition, not a reference. | |
1394aabd | 5700 | So normally clear DECL_EXTERNAL. |
51e29401 | 5701 | However, `extern inline' acts like a declaration |
1394aabd RS |
5702 | except for defining how to inline. So set DECL_EXTERNAL in that case. */ |
5703 | DECL_EXTERNAL (decl1) = current_extern_inline; | |
51e29401 RS |
5704 | |
5705 | /* This function exists in static storage. | |
5706 | (This does not mean `static' in the C sense!) */ | |
5707 | TREE_STATIC (decl1) = 1; | |
5708 | ||
5709 | /* A nested function is not global. */ | |
5710 | if (current_function_decl != 0) | |
5711 | TREE_PUBLIC (decl1) = 0; | |
5712 | ||
5713 | /* Record the decl so that the function name is defined. | |
5714 | If we already have a decl for this name, and it is a FUNCTION_DECL, | |
5715 | use the old decl. */ | |
5716 | ||
5717 | current_function_decl = pushdecl (decl1); | |
5718 | ||
5719 | pushlevel (0); | |
5720 | declare_parm_level (1); | |
5721 | current_binding_level->subblocks_tag_transparent = 1; | |
5722 | ||
5723 | make_function_rtl (current_function_decl); | |
5724 | ||
5725 | restype = TREE_TYPE (TREE_TYPE (current_function_decl)); | |
5726 | /* Promote the value to int before returning it. */ | |
24bc4c7f | 5727 | if (C_PROMOTING_INTEGER_TYPE_P (restype)) |
42dfa47f RS |
5728 | { |
5729 | /* It retains unsignedness if traditional | |
5730 | or if not really getting wider. */ | |
5731 | if (TREE_UNSIGNED (restype) | |
5732 | && (flag_traditional | |
5733 | || (TYPE_PRECISION (restype) | |
5734 | == TYPE_PRECISION (integer_type_node)))) | |
5735 | restype = unsigned_type_node; | |
5736 | else | |
5737 | restype = integer_type_node; | |
5738 | } | |
8d9bfdc5 RK |
5739 | DECL_RESULT (current_function_decl) |
5740 | = build_decl (RESULT_DECL, NULL_TREE, restype); | |
51e29401 RS |
5741 | |
5742 | if (!nested) | |
5743 | /* Allocate further tree nodes temporarily during compilation | |
5744 | of this function only. */ | |
5745 | temporary_allocation (); | |
5746 | ||
5747 | /* If this fcn was already referenced via a block-scope `extern' decl | |
5748 | (or an implicit decl), propagate certain information about the usage. */ | |
5749 | if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl))) | |
5750 | TREE_ADDRESSABLE (current_function_decl) = 1; | |
5751 | ||
5752 | return 1; | |
5753 | } | |
5754 | ||
5755 | /* Record that this function is going to be a varargs function. | |
5756 | This is called before store_parm_decls, which is too early | |
5757 | to call mark_varargs directly. */ | |
5758 | ||
5759 | void | |
5760 | c_mark_varargs () | |
5761 | { | |
5762 | c_function_varargs = 1; | |
5763 | } | |
5764 | \f | |
5765 | /* Store the parameter declarations into the current function declaration. | |
5766 | This is called after parsing the parameter declarations, before | |
5767 | digesting the body of the function. | |
5768 | ||
5769 | For an old-style definition, modify the function's type | |
5770 | to specify at least the number of arguments. */ | |
5771 | ||
5772 | void | |
5773 | store_parm_decls () | |
5774 | { | |
5775 | register tree fndecl = current_function_decl; | |
5776 | register tree parm; | |
5777 | ||
5778 | /* This is either a chain of PARM_DECLs (if a prototype was used) | |
5779 | or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */ | |
5780 | tree specparms = current_function_parms; | |
5781 | ||
5782 | /* This is a list of types declared among parms in a prototype. */ | |
5783 | tree parmtags = current_function_parm_tags; | |
5784 | ||
5785 | /* This is a chain of PARM_DECLs from old-style parm declarations. */ | |
5786 | register tree parmdecls = getdecls (); | |
5787 | ||
5788 | /* This is a chain of any other decls that came in among the parm | |
5789 | declarations. If a parm is declared with enum {foo, bar} x; | |
5790 | then CONST_DECLs for foo and bar are put here. */ | |
5791 | tree nonparms = 0; | |
5792 | ||
5793 | /* Nonzero if this definition is written with a prototype. */ | |
5794 | int prototype = 0; | |
5795 | ||
5796 | if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST) | |
5797 | { | |
5798 | /* This case is when the function was defined with an ANSI prototype. | |
5799 | The parms already have decls, so we need not do anything here | |
5800 | except record them as in effect | |
5801 | and complain if any redundant old-style parm decls were written. */ | |
5802 | ||
5803 | register tree next; | |
5804 | tree others = 0; | |
5805 | ||
5806 | prototype = 1; | |
5807 | ||
5808 | if (parmdecls != 0) | |
7a0347ff RS |
5809 | { |
5810 | tree decl, link; | |
5811 | ||
5812 | error_with_decl (fndecl, | |
5813 | "parm types given both in parmlist and separately"); | |
5814 | /* Get rid of the erroneous decls; don't keep them on | |
5815 | the list of parms, since they might not be PARM_DECLs. */ | |
5816 | for (decl = current_binding_level->names; | |
5817 | decl; decl = TREE_CHAIN (decl)) | |
5818 | if (DECL_NAME (decl)) | |
5819 | IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0; | |
5820 | for (link = current_binding_level->shadowed; | |
5821 | link; link = TREE_CHAIN (link)) | |
5822 | IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link); | |
5823 | current_binding_level->names = 0; | |
5824 | current_binding_level->shadowed = 0; | |
5825 | } | |
51e29401 RS |
5826 | |
5827 | specparms = nreverse (specparms); | |
5828 | for (parm = specparms; parm; parm = next) | |
5829 | { | |
5830 | next = TREE_CHAIN (parm); | |
5831 | if (TREE_CODE (parm) == PARM_DECL) | |
5832 | { | |
5833 | if (DECL_NAME (parm) == 0) | |
5834 | error_with_decl (parm, "parameter name omitted"); | |
5fe86b8b | 5835 | else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node) |
a4faa7cc JW |
5836 | { |
5837 | error_with_decl (parm, "parameter `%s' declared void"); | |
5838 | /* Change the type to error_mark_node so this parameter | |
5839 | will be ignored by assign_parms. */ | |
5840 | TREE_TYPE (parm) = error_mark_node; | |
5841 | } | |
51e29401 RS |
5842 | pushdecl (parm); |
5843 | } | |
5844 | else | |
5845 | { | |
5846 | /* If we find an enum constant or a type tag, | |
5847 | put it aside for the moment. */ | |
5848 | TREE_CHAIN (parm) = 0; | |
5849 | others = chainon (others, parm); | |
5850 | } | |
5851 | } | |
5852 | ||
5853 | /* Get the decls in their original chain order | |
5854 | and record in the function. */ | |
5855 | DECL_ARGUMENTS (fndecl) = getdecls (); | |
5856 | ||
5857 | #if 0 | |
5858 | /* If this function takes a variable number of arguments, | |
5859 | add a phony parameter to the end of the parm list, | |
5860 | to represent the position of the first unnamed argument. */ | |
5861 | if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))) | |
5862 | != void_type_node) | |
5863 | { | |
5864 | tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node); | |
5865 | /* Let's hope the address of the unnamed parm | |
5866 | won't depend on its type. */ | |
5867 | TREE_TYPE (dummy) = integer_type_node; | |
5868 | DECL_ARG_TYPE (dummy) = integer_type_node; | |
5869 | DECL_ARGUMENTS (fndecl) | |
5870 | = chainon (DECL_ARGUMENTS (fndecl), dummy); | |
5871 | } | |
5872 | #endif | |
5873 | ||
5874 | /* Now pushdecl the enum constants. */ | |
5875 | for (parm = others; parm; parm = next) | |
5876 | { | |
5877 | next = TREE_CHAIN (parm); | |
5878 | if (DECL_NAME (parm) == 0) | |
5879 | ; | |
5fe86b8b | 5880 | else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node) |
51e29401 RS |
5881 | ; |
5882 | else if (TREE_CODE (parm) != PARM_DECL) | |
5883 | pushdecl (parm); | |
5884 | } | |
5885 | ||
5886 | storetags (chainon (parmtags, gettags ())); | |
5887 | } | |
5888 | else | |
5889 | { | |
5890 | /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes | |
5891 | each with a parm name as the TREE_VALUE. | |
5892 | ||
5893 | PARMDECLS is a chain of declarations for parameters. | |
5894 | Warning! It can also contain CONST_DECLs which are not parameters | |
5895 | but are names of enumerators of any enum types | |
5896 | declared among the parameters. | |
5897 | ||
5898 | First match each formal parameter name with its declaration. | |
5899 | Associate decls with the names and store the decls | |
5900 | into the TREE_PURPOSE slots. */ | |
5901 | ||
5902 | for (parm = parmdecls; parm; parm = TREE_CHAIN (parm)) | |
5903 | DECL_RESULT (parm) = 0; | |
5904 | ||
5905 | for (parm = specparms; parm; parm = TREE_CHAIN (parm)) | |
5906 | { | |
5907 | register tree tail, found = NULL; | |
5908 | ||
5909 | if (TREE_VALUE (parm) == 0) | |
5910 | { | |
5911 | error_with_decl (fndecl, "parameter name missing from parameter list"); | |
5912 | TREE_PURPOSE (parm) = 0; | |
5913 | continue; | |
5914 | } | |
5915 | ||
5916 | /* See if any of the parmdecls specifies this parm by name. | |
5917 | Ignore any enumerator decls. */ | |
5918 | for (tail = parmdecls; tail; tail = TREE_CHAIN (tail)) | |
5919 | if (DECL_NAME (tail) == TREE_VALUE (parm) | |
5920 | && TREE_CODE (tail) == PARM_DECL) | |
5921 | { | |
5922 | found = tail; | |
5923 | break; | |
5924 | } | |
5925 | ||
5926 | /* If declaration already marked, we have a duplicate name. | |
5927 | Complain, and don't use this decl twice. */ | |
5928 | if (found && DECL_RESULT (found) != 0) | |
5929 | { | |
5930 | error_with_decl (found, "multiple parameters named `%s'"); | |
5931 | found = 0; | |
5932 | } | |
5933 | ||
5934 | /* If the declaration says "void", complain and ignore it. */ | |
5fe86b8b | 5935 | if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node) |
51e29401 RS |
5936 | { |
5937 | error_with_decl (found, "parameter `%s' declared void"); | |
5938 | TREE_TYPE (found) = integer_type_node; | |
5939 | DECL_ARG_TYPE (found) = integer_type_node; | |
5940 | layout_decl (found, 0); | |
5941 | } | |
5942 | ||
5943 | /* Traditionally, a parm declared float is actually a double. */ | |
5944 | if (found && flag_traditional | |
90d56da8 | 5945 | && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node) |
6d142a10 RS |
5946 | { |
5947 | TREE_TYPE (found) = double_type_node; | |
5948 | DECL_ARG_TYPE (found) = double_type_node; | |
5949 | layout_decl (found, 0); | |
5950 | } | |
51e29401 RS |
5951 | |
5952 | /* If no declaration found, default to int. */ | |
5953 | if (!found) | |
5954 | { | |
5955 | found = build_decl (PARM_DECL, TREE_VALUE (parm), | |
5956 | integer_type_node); | |
5957 | DECL_ARG_TYPE (found) = TREE_TYPE (found); | |
5958 | DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl); | |
5959 | DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl); | |
5960 | if (extra_warnings) | |
5961 | warning_with_decl (found, "type of `%s' defaults to `int'"); | |
5962 | pushdecl (found); | |
5963 | } | |
5964 | ||
5965 | TREE_PURPOSE (parm) = found; | |
5966 | ||
5967 | /* Mark this decl as "already found" -- see test, above. | |
5968 | It is safe to use DECL_RESULT for this | |
5969 | since it is not used in PARM_DECLs or CONST_DECLs. */ | |
5970 | DECL_RESULT (found) = error_mark_node; | |
5971 | } | |
5972 | ||
5973 | /* Put anything which is on the parmdecls chain and which is | |
5974 | not a PARM_DECL onto the list NONPARMS. (The types of | |
5975 | non-parm things which might appear on the list include | |
5976 | enumerators and NULL-named TYPE_DECL nodes.) Complain about | |
5977 | any actual PARM_DECLs not matched with any names. */ | |
5978 | ||
5979 | nonparms = 0; | |
5980 | for (parm = parmdecls; parm; ) | |
5981 | { | |
5982 | tree next = TREE_CHAIN (parm); | |
5983 | TREE_CHAIN (parm) = 0; | |
5984 | ||
5985 | if (TREE_CODE (parm) != PARM_DECL) | |
5986 | nonparms = chainon (nonparms, parm); | |
5987 | else | |
5988 | { | |
5989 | /* Complain about args with incomplete types. */ | |
5990 | if (TYPE_SIZE (TREE_TYPE (parm)) == 0) | |
5991 | { | |
5992 | error_with_decl (parm, "parameter `%s' has incomplete type"); | |
5993 | TREE_TYPE (parm) = error_mark_node; | |
5994 | } | |
5995 | ||
5996 | if (DECL_RESULT (parm) == 0) | |
5997 | { | |
5998 | error_with_decl (parm, | |
5999 | "declaration for parameter `%s' but no such parameter"); | |
6000 | /* Pretend the parameter was not missing. | |
6001 | This gets us to a standard state and minimizes | |
6002 | further error messages. */ | |
6003 | specparms | |
6004 | = chainon (specparms, | |
6005 | tree_cons (parm, NULL_TREE, NULL_TREE)); | |
6006 | } | |
6007 | } | |
6008 | ||
6009 | parm = next; | |
6010 | } | |
6011 | ||
6012 | /* Chain the declarations together in the order of the list of names. */ | |
6013 | /* Store that chain in the function decl, replacing the list of names. */ | |
6014 | parm = specparms; | |
6015 | DECL_ARGUMENTS (fndecl) = 0; | |
6016 | { | |
6017 | register tree last; | |
6018 | for (last = 0; parm; parm = TREE_CHAIN (parm)) | |
6019 | if (TREE_PURPOSE (parm)) | |
6020 | { | |
6021 | if (last == 0) | |
6022 | DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm); | |
6023 | else | |
6024 | TREE_CHAIN (last) = TREE_PURPOSE (parm); | |
6025 | last = TREE_PURPOSE (parm); | |
6026 | TREE_CHAIN (last) = 0; | |
6027 | } | |
6028 | } | |
6029 | ||
6030 | /* If there was a previous prototype, | |
6031 | set the DECL_ARG_TYPE of each argument according to | |
6032 | the type previously specified, and report any mismatches. */ | |
6033 | ||
6034 | if (TYPE_ARG_TYPES (TREE_TYPE (fndecl))) | |
6035 | { | |
6036 | register tree type; | |
6037 | for (parm = DECL_ARGUMENTS (fndecl), | |
6038 | type = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); | |
5fe86b8b RS |
6039 | parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) |
6040 | != void_type_node)); | |
51e29401 RS |
6041 | parm = TREE_CHAIN (parm), type = TREE_CHAIN (type)) |
6042 | { | |
6043 | if (parm == 0 || type == 0 | |
5fe86b8b | 6044 | || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node) |
51e29401 RS |
6045 | { |
6046 | error ("number of arguments doesn't match prototype"); | |
50a9145c JW |
6047 | error_with_file_and_line (current_function_prototype_file, |
6048 | current_function_prototype_line, | |
6049 | "prototype declaration"); | |
51e29401 RS |
6050 | break; |
6051 | } | |
6052 | /* Type for passing arg must be consistent | |
6053 | with that declared for the arg. */ | |
ec2343c4 | 6054 | if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type))) |
51e29401 | 6055 | { |
b3fc0c98 RS |
6056 | if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) |
6057 | == TYPE_MAIN_VARIANT (TREE_VALUE (type))) | |
51e29401 | 6058 | { |
ec2343c4 MM |
6059 | /* Adjust argument to match prototype. E.g. a previous |
6060 | `int foo(float);' prototype causes | |
6061 | `int foo(x) float x; {...}' to be treated like | |
6062 | `int foo(float x) {...}'. This is particularly | |
6063 | useful for argument types like uid_t. */ | |
6064 | DECL_ARG_TYPE (parm) = TREE_TYPE (parm); | |
6065 | #ifdef PROMOTE_PROTOTYPES | |
6066 | if (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE | |
6067 | && TYPE_PRECISION (TREE_TYPE (parm)) | |
6068 | < TYPE_PRECISION (integer_type_node)) | |
6069 | DECL_ARG_TYPE (parm) = integer_type_node; | |
6070 | #endif | |
6071 | if (pedantic) | |
50a9145c | 6072 | { |
42f00318 | 6073 | pedwarn ("promoted argument `%s' doesn't match prototype", |
50a9145c JW |
6074 | IDENTIFIER_POINTER (DECL_NAME (parm))); |
6075 | warning_with_file_and_line | |
6076 | (current_function_prototype_file, | |
6077 | current_function_prototype_line, | |
6078 | "prototype declaration"); | |
6079 | } | |
51e29401 | 6080 | } |
ec2343c4 MM |
6081 | /* If -traditional, allow `int' argument to match |
6082 | `unsigned' prototype. */ | |
6083 | else if (! (flag_traditional | |
90d56da8 RS |
6084 | && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node |
6085 | && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)) | |
50a9145c JW |
6086 | { |
6087 | error ("argument `%s' doesn't match prototype", | |
6088 | IDENTIFIER_POINTER (DECL_NAME (parm))); | |
6089 | error_with_file_and_line (current_function_prototype_file, | |
6090 | current_function_prototype_line, | |
6091 | "prototype declaration"); | |
6092 | } | |
51e29401 RS |
6093 | } |
6094 | } | |
6095 | TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0; | |
6096 | } | |
6097 | ||
6098 | /* Otherwise, create a prototype that would match. */ | |
6099 | ||
6100 | else | |
6101 | { | |
6102 | register tree actual, type; | |
6103 | register tree last = 0; | |
6104 | ||
6105 | for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm)) | |
6106 | { | |
8d9bfdc5 RK |
6107 | type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), |
6108 | NULL_TREE); | |
51e29401 RS |
6109 | if (last) |
6110 | TREE_CHAIN (last) = type; | |
6111 | else | |
6112 | actual = type; | |
6113 | last = type; | |
6114 | } | |
8d9bfdc5 | 6115 | type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE); |
51e29401 RS |
6116 | if (last) |
6117 | TREE_CHAIN (last) = type; | |
6118 | else | |
6119 | actual = type; | |
6120 | ||
c138f328 RS |
6121 | /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES |
6122 | of the type of this function, but we need to avoid having this | |
6123 | affect the types of other similarly-typed functions, so we must | |
6124 | first force the generation of an identical (but separate) type | |
6125 | node for the relevant function type. The new node we create | |
6126 | will be a variant of the main variant of the original function | |
6127 | type. */ | |
6128 | ||
929f3671 | 6129 | TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl)); |
c138f328 | 6130 | |
51e29401 RS |
6131 | TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual; |
6132 | } | |
6133 | ||
6134 | /* Now store the final chain of decls for the arguments | |
6135 | as the decl-chain of the current lexical scope. | |
6136 | Put the enumerators in as well, at the front so that | |
6137 | DECL_ARGUMENTS is not modified. */ | |
6138 | ||
6139 | storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl))); | |
6140 | } | |
6141 | ||
6142 | /* Make sure the binding level for the top of the function body | |
6143 | gets a BLOCK if there are any in the function. | |
6144 | Otherwise, the dbx output is wrong. */ | |
6145 | ||
6146 | keep_next_if_subblocks = 1; | |
6147 | ||
6148 | /* ??? This might be an improvement, | |
6149 | but needs to be thought about some more. */ | |
6150 | #if 0 | |
6151 | keep_next_level_flag = 1; | |
6152 | #endif | |
6153 | ||
6154 | /* Write a record describing this function definition to the prototypes | |
6155 | file (if requested). */ | |
6156 | ||
6157 | gen_aux_info_record (fndecl, 1, 0, prototype); | |
6158 | ||
6159 | /* Initialize the RTL code for the function. */ | |
6160 | ||
6161 | init_function_start (fndecl, input_filename, lineno); | |
6162 | ||
6163 | /* If this is a varargs function, inform function.c. */ | |
6164 | ||
6165 | if (c_function_varargs) | |
6166 | mark_varargs (); | |
6167 | ||
b032c74c | 6168 | /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */ |
7da551a2 RS |
6169 | |
6170 | declare_function_name (); | |
93e3ba4f | 6171 | |
51e29401 RS |
6172 | /* Set up parameters and prepare for return, for the function. */ |
6173 | ||
6174 | expand_function_start (fndecl, 0); | |
6175 | ||
6176 | /* If this function is `main', emit a call to `__main' | |
6177 | to run global initializers, etc. */ | |
6178 | if (DECL_NAME (fndecl) | |
6179 | && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0 | |
6180 | && DECL_CONTEXT (fndecl) == NULL_TREE) | |
6181 | expand_main_function (); | |
6182 | } | |
6183 | \f | |
6184 | /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes | |
6185 | each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE | |
6186 | stands for an ellipsis in the identifier list. | |
6187 | ||
6188 | PARMLIST is the data returned by get_parm_info for the | |
6189 | parmlist that follows the semicolon. | |
6190 | ||
6191 | We return a value of the same sort that get_parm_info returns, | |
6192 | except that it describes the combination of identifiers and parmlist. */ | |
6193 | ||
6194 | tree | |
6195 | combine_parm_decls (specparms, parmlist, void_at_end) | |
6196 | tree specparms, parmlist; | |
6197 | int void_at_end; | |
6198 | { | |
6199 | register tree fndecl = current_function_decl; | |
6200 | register tree parm; | |
6201 | ||
6202 | tree parmdecls = TREE_PURPOSE (parmlist); | |
6203 | ||
6204 | /* This is a chain of any other decls that came in among the parm | |
6205 | declarations. They were separated already by get_parm_info, | |
6206 | so we just need to keep them separate. */ | |
6207 | tree nonparms = TREE_VALUE (parmlist); | |
6208 | ||
6209 | tree types = 0; | |
6210 | ||
6211 | for (parm = parmdecls; parm; parm = TREE_CHAIN (parm)) | |
6212 | DECL_RESULT (parm) = 0; | |
6213 | ||
6214 | for (parm = specparms; parm; parm = TREE_CHAIN (parm)) | |
6215 | { | |
6216 | register tree tail, found = NULL; | |
6217 | ||
6218 | /* See if any of the parmdecls specifies this parm by name. */ | |
6219 | for (tail = parmdecls; tail; tail = TREE_CHAIN (tail)) | |
6220 | if (DECL_NAME (tail) == TREE_VALUE (parm)) | |
6221 | { | |
6222 | found = tail; | |
6223 | break; | |
6224 | } | |
6225 | ||
6226 | /* If declaration already marked, we have a duplicate name. | |
6227 | Complain, and don't use this decl twice. */ | |
6228 | if (found && DECL_RESULT (found) != 0) | |
6229 | { | |
6230 | error_with_decl (found, "multiple parameters named `%s'"); | |
6231 | found = 0; | |
6232 | } | |
6233 | ||
6234 | /* If the declaration says "void", complain and ignore it. */ | |
5fe86b8b | 6235 | if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node) |
51e29401 RS |
6236 | { |
6237 | error_with_decl (found, "parameter `%s' declared void"); | |
6238 | TREE_TYPE (found) = integer_type_node; | |
6239 | DECL_ARG_TYPE (found) = integer_type_node; | |
6240 | layout_decl (found, 0); | |
6241 | } | |
6242 | ||
6243 | /* Traditionally, a parm declared float is actually a double. */ | |
6244 | if (found && flag_traditional | |
90d56da8 | 6245 | && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node) |
6d142a10 RS |
6246 | { |
6247 | TREE_TYPE (found) = double_type_node; | |
6248 | DECL_ARG_TYPE (found) = double_type_node; | |
6249 | layout_decl (found, 0); | |
6250 | } | |
51e29401 RS |
6251 | |
6252 | /* If no declaration found, default to int. */ | |
6253 | if (!found) | |
6254 | { | |
6255 | found = build_decl (PARM_DECL, TREE_VALUE (parm), | |
6256 | integer_type_node); | |
6257 | DECL_ARG_TYPE (found) = TREE_TYPE (found); | |
6258 | DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl); | |
6259 | DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl); | |
6b2a374b | 6260 | error_with_decl (found, "type of parameter `%s' is not declared"); |
51e29401 RS |
6261 | pushdecl (found); |
6262 | } | |
6263 | ||
6264 | TREE_PURPOSE (parm) = found; | |
6265 | ||
6266 | /* Mark this decl as "already found" -- see test, above. | |
6267 | It is safe to use DECL_RESULT for this | |
6268 | since it is not used in PARM_DECLs or CONST_DECLs. */ | |
6269 | DECL_RESULT (found) = error_mark_node; | |
6270 | } | |
6271 | ||
6272 | /* Complain about any actual PARM_DECLs not matched with any names. */ | |
6273 | ||
6274 | for (parm = parmdecls; parm; ) | |
6275 | { | |
6276 | tree next = TREE_CHAIN (parm); | |
6277 | TREE_CHAIN (parm) = 0; | |
6278 | ||
6279 | /* Complain about args with incomplete types. */ | |
6280 | if (TYPE_SIZE (TREE_TYPE (parm)) == 0) | |
6281 | { | |
6282 | error_with_decl (parm, "parameter `%s' has incomplete type"); | |
6283 | TREE_TYPE (parm) = error_mark_node; | |
6284 | } | |
6285 | ||
6286 | if (DECL_RESULT (parm) == 0) | |
6287 | { | |
6288 | error_with_decl (parm, | |
6289 | "declaration for parameter `%s' but no such parameter"); | |
6290 | /* Pretend the parameter was not missing. | |
6291 | This gets us to a standard state and minimizes | |
6292 | further error messages. */ | |
6293 | specparms | |
6294 | = chainon (specparms, | |
6295 | tree_cons (parm, NULL_TREE, NULL_TREE)); | |
6296 | } | |
6297 | ||
6298 | parm = next; | |
6299 | } | |
6300 | ||
6301 | /* Chain the declarations together in the order of the list of names. | |
6302 | At the same time, build up a list of their types, in reverse order. */ | |
6303 | ||
6304 | parm = specparms; | |
6305 | parmdecls = 0; | |
6306 | { | |
6307 | register tree last; | |
6308 | for (last = 0; parm; parm = TREE_CHAIN (parm)) | |
6309 | if (TREE_PURPOSE (parm)) | |
6310 | { | |
6311 | if (last == 0) | |
6312 | parmdecls = TREE_PURPOSE (parm); | |
6313 | else | |
6314 | TREE_CHAIN (last) = TREE_PURPOSE (parm); | |
6315 | last = TREE_PURPOSE (parm); | |
6316 | TREE_CHAIN (last) = 0; | |
6317 | ||
6318 | types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types); | |
6319 | } | |
6320 | } | |
6321 | ||
6322 | if (void_at_end) | |
6323 | return saveable_tree_cons (parmdecls, nonparms, | |
6324 | nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types))); | |
6325 | ||
6326 | return saveable_tree_cons (parmdecls, nonparms, nreverse (types)); | |
6327 | } | |
6328 | \f | |
6329 | /* Finish up a function declaration and compile that function | |
6330 | all the way to assembler language output. The free the storage | |
6331 | for the function definition. | |
6332 | ||
6333 | This is called after parsing the body of the function definition. | |
6334 | ||
6335 | NESTED is nonzero if the function being finished is nested in another. */ | |
6336 | ||
6337 | void | |
6338 | finish_function (nested) | |
6339 | int nested; | |
6340 | { | |
6341 | register tree fndecl = current_function_decl; | |
6342 | ||
6343 | /* TREE_READONLY (fndecl) = 1; | |
6344 | This caused &foo to be of type ptr-to-const-function | |
6345 | which then got a warning when stored in a ptr-to-function variable. */ | |
6346 | ||
6347 | poplevel (1, 0, 1); | |
960a2eb1 | 6348 | BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl; |
51e29401 RS |
6349 | |
6350 | /* Must mark the RESULT_DECL as being in this function. */ | |
6351 | ||
6352 | DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl; | |
6353 | ||
6354 | /* Obey `register' declarations if `setjmp' is called in this fn. */ | |
6355 | if (flag_traditional && current_function_calls_setjmp) | |
6356 | { | |
6357 | setjmp_protect (DECL_INITIAL (fndecl)); | |
6358 | setjmp_protect_args (); | |
6359 | } | |
6360 | ||
6361 | #ifdef DEFAULT_MAIN_RETURN | |
6362 | if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main")) | |
6363 | { | |
90d56da8 RS |
6364 | if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) |
6365 | != integer_type_node) | |
8e077183 RS |
6366 | warning_with_decl (fndecl, "return type of `%s' is not `int'"); |
6367 | else | |
6368 | { | |
6369 | /* Make it so that `main' always returns success by default. */ | |
6370 | DEFAULT_MAIN_RETURN; | |
6371 | } | |
51e29401 RS |
6372 | } |
6373 | #endif | |
6374 | ||
6375 | /* Generate rtl for function exit. */ | |
6376 | expand_function_end (input_filename, lineno); | |
6377 | ||
6378 | /* So we can tell if jump_optimize sets it to 1. */ | |
6379 | can_reach_end = 0; | |
6380 | ||
6381 | /* Run the optimizers and output the assembler code for this function. */ | |
6382 | rest_of_compilation (fndecl); | |
6383 | ||
6384 | current_function_returns_null |= can_reach_end; | |
6385 | ||
6386 | if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null) | |
6387 | warning ("`volatile' function does return"); | |
42dfa47f | 6388 | else if (warn_return_type && can_reach_end |
51e29401 RS |
6389 | && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node) |
6390 | /* If this function returns non-void and control can drop through, | |
6391 | complain. */ | |
6392 | warning ("control reaches end of non-void function"); | |
6393 | /* With just -W, complain only if function returns both with | |
6394 | and without a value. */ | |
6395 | else if (extra_warnings | |
6396 | && current_function_returns_value && current_function_returns_null) | |
6397 | warning ("this function may return with or without a value"); | |
6398 | ||
6399 | /* Free all the tree nodes making up this function. */ | |
6400 | /* Switch back to allocating nodes permanently | |
6401 | until we start another function. */ | |
6402 | if (! nested) | |
6403 | permanent_allocation (); | |
6404 | ||
6405 | if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested) | |
6406 | { | |
6407 | /* Stop pointing to the local nodes about to be freed. */ | |
6408 | /* But DECL_INITIAL must remain nonzero so we know this | |
6409 | was an actual function definition. */ | |
6410 | /* For a nested function, this is done in pop_c_function_context. */ | |
6411 | DECL_INITIAL (fndecl) = error_mark_node; | |
6412 | DECL_ARGUMENTS (fndecl) = 0; | |
6413 | } | |
6414 | ||
6415 | if (! nested) | |
6416 | { | |
6417 | /* Let the error reporting routines know that we're outside a | |
6418 | function. For a nested function, this value is used in | |
6419 | pop_c_function_context and then reset via pop_function_context. */ | |
6420 | current_function_decl = NULL; | |
6421 | } | |
6422 | } | |
6423 | \f | |
6424 | /* Save and restore the variables in this file and elsewhere | |
6425 | that keep track of the progress of compilation of the current function. | |
6426 | Used for nested functions. */ | |
6427 | ||
6428 | struct c_function | |
6429 | { | |
6430 | struct c_function *next; | |
6431 | tree enum_next_value; | |
6432 | tree named_labels; | |
6433 | tree shadowed_labels; | |
6434 | int returns_value; | |
6435 | int returns_null; | |
6436 | int warn_about_return_type; | |
6437 | int extern_inline; | |
6438 | struct binding_level *binding_level; | |
6439 | }; | |
6440 | ||
6441 | struct c_function *c_function_chain; | |
6442 | ||
6443 | /* Save and reinitialize the variables | |
6444 | used during compilation of a C function. */ | |
6445 | ||
6446 | void | |
6447 | push_c_function_context () | |
6448 | { | |
6449 | struct c_function *p | |
6450 | = (struct c_function *) xmalloc (sizeof (struct c_function)); | |
6451 | ||
ec2343c4 MM |
6452 | if (pedantic) |
6453 | pedwarn ("ANSI C forbids nested functions"); | |
6454 | ||
51e29401 RS |
6455 | push_function_context (); |
6456 | ||
6457 | p->next = c_function_chain; | |
6458 | c_function_chain = p; | |
6459 | ||
6460 | p->enum_next_value = enum_next_value; | |
6461 | p->named_labels = named_labels; | |
6462 | p->shadowed_labels = shadowed_labels; | |
6463 | p->returns_value = current_function_returns_value; | |
6464 | p->returns_null = current_function_returns_null; | |
6465 | p->warn_about_return_type = warn_about_return_type; | |
6466 | p->extern_inline = current_extern_inline; | |
6467 | p->binding_level = current_binding_level; | |
6468 | } | |
6469 | ||
6470 | /* Restore the variables used during compilation of a C function. */ | |
6471 | ||
6472 | void | |
6473 | pop_c_function_context () | |
6474 | { | |
6475 | struct c_function *p = c_function_chain; | |
6476 | tree link; | |
6477 | ||
6478 | /* Bring back all the labels that were shadowed. */ | |
6479 | for (link = shadowed_labels; link; link = TREE_CHAIN (link)) | |
6480 | if (DECL_NAME (TREE_VALUE (link)) != 0) | |
6481 | IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) | |
6482 | = TREE_VALUE (link); | |
6483 | ||
6484 | if (DECL_SAVED_INSNS (current_function_decl) == 0) | |
6485 | { | |
6486 | /* Stop pointing to the local nodes about to be freed. */ | |
6487 | /* But DECL_INITIAL must remain nonzero so we know this | |
6488 | was an actual function definition. */ | |
6489 | DECL_INITIAL (current_function_decl) = error_mark_node; | |
6490 | DECL_ARGUMENTS (current_function_decl) = 0; | |
6491 | } | |
6492 | ||
6493 | pop_function_context (); | |
6494 | ||
6495 | c_function_chain = p->next; | |
6496 | ||
6497 | enum_next_value = p->enum_next_value; | |
6498 | named_labels = p->named_labels; | |
6499 | shadowed_labels = p->shadowed_labels; | |
6500 | current_function_returns_value = p->returns_value; | |
6501 | current_function_returns_null = p->returns_null; | |
6502 | warn_about_return_type = p->warn_about_return_type; | |
6503 | current_extern_inline = p->extern_inline; | |
6504 | current_binding_level = p->binding_level; | |
6505 | ||
6506 | free (p); | |
6507 | } |