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51e29401 | 1 | /* Process declarations and variables for C compiler. |
a5544970 | 2 | Copyright (C) 1988-2019 Free Software Foundation, Inc. |
51e29401 | 3 | |
1322177d | 4 | This file is part of GCC. |
51e29401 | 5 | |
1322177d LB |
6 | GCC is free software; you can redistribute it and/or modify it under |
7 | the terms of the GNU General Public License as published by the Free | |
9dcd6f09 | 8 | Software Foundation; either version 3, or (at your option) any later |
1322177d | 9 | version. |
51e29401 | 10 | |
1322177d LB |
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
51e29401 RS |
15 | |
16 | You should have received a copy of the GNU General Public License | |
9dcd6f09 NC |
17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
51e29401 | 19 | |
51e29401 RS |
20 | /* Process declarations and symbol lookup for C front end. |
21 | Also constructs types; the standard scalar types at initialization, | |
22 | and structure, union, array and enum types when they are declared. */ | |
23 | ||
24 | /* ??? not all decl nodes are given the most useful possible | |
25 | line numbers. For example, the CONST_DECLs for enum values. */ | |
26 | ||
27 | #include "config.h" | |
6c7a259b | 28 | #define INCLUDE_UNIQUE_PTR |
670ee920 | 29 | #include "system.h" |
4977bab6 | 30 | #include "coretypes.h" |
2adfab87 AM |
31 | #include "target.h" |
32 | #include "function.h" | |
2adfab87 AM |
33 | #include "c-tree.h" |
34 | #include "timevar.h" | |
2adfab87 AM |
35 | #include "stringpool.h" |
36 | #include "cgraph.h" | |
37 | #include "intl.h" | |
d8a2d370 DN |
38 | #include "print-tree.h" |
39 | #include "stor-layout.h" | |
40 | #include "varasm.h" | |
41 | #include "attribs.h" | |
5f6da302 | 42 | #include "toplev.h" |
e1772ac0 | 43 | #include "debug.h" |
61d3ce20 | 44 | #include "c-family/c-objc.h" |
39dabefd | 45 | #include "c-family/c-pragma.h" |
b906f4ca | 46 | #include "c-family/c-ubsan.h" |
29cc57cf | 47 | #include "c-lang.h" |
6de9cd9a | 48 | #include "langhooks.h" |
726a989a | 49 | #include "tree-iterator.h" |
7ee2468b | 50 | #include "dumpfile.h" |
68a607d8 | 51 | #include "plugin.h" |
39dabefd | 52 | #include "c-family/c-ada-spec.h" |
9b2b7279 | 53 | #include "builtins.h" |
1a4f11c8 DM |
54 | #include "spellcheck-tree.h" |
55 | #include "gcc-rich-location.h" | |
45b2222a | 56 | #include "asan.h" |
6c7a259b | 57 | #include "c-family/name-hint.h" |
26edace6 | 58 | #include "c-family/known-headers.h" |
613bc14f | 59 | #include "c-family/c-spellcheck.h" |
a0d85b75 | 60 | |
51e29401 RS |
61 | /* In grokdeclarator, distinguish syntactic contexts of declarators. */ |
62 | enum decl_context | |
63 | { NORMAL, /* Ordinary declaration */ | |
64 | FUNCDEF, /* Function definition */ | |
65 | PARM, /* Declaration of parm before function body */ | |
66 | FIELD, /* Declaration inside struct or union */ | |
51e29401 RS |
67 | TYPENAME}; /* Typename (inside cast or sizeof) */ |
68 | ||
0da300cd TT |
69 | /* States indicating how grokdeclarator() should handle declspecs marked |
70 | with __attribute__((deprecated)). An object declared as | |
71 | __attribute__((deprecated)) suppresses warnings of uses of other | |
72 | deprecated items. */ | |
73 | ||
74 | enum deprecated_states { | |
75 | DEPRECATED_NORMAL, | |
76 | DEPRECATED_SUPPRESS | |
77 | }; | |
78 | ||
51e29401 | 79 | \f |
51e29401 RS |
80 | /* Nonzero if we have seen an invalid cross reference |
81 | to a struct, union, or enum, but not yet printed the message. */ | |
51e29401 | 82 | tree pending_invalid_xref; |
093c7153 | 83 | |
51e29401 | 84 | /* File and line to appear in the eventual error message. */ |
070588f0 | 85 | location_t pending_invalid_xref_location; |
51e29401 | 86 | |
77dbdb57 ZW |
87 | /* The file and line that the prototype came from if this is an |
88 | old-style definition; used for diagnostics in | |
89 | store_parm_decls_oldstyle. */ | |
eb1dfbb2 | 90 | |
95035b6f | 91 | static location_t current_function_prototype_locus; |
50a9145c | 92 | |
6fb58bba JM |
93 | /* Whether this prototype was built-in. */ |
94 | ||
95 | static bool current_function_prototype_built_in; | |
96 | ||
97 | /* The argument type information of this prototype. */ | |
98 | ||
99 | static tree current_function_prototype_arg_types; | |
100 | ||
7b112487 JM |
101 | /* The argument information structure for the function currently being |
102 | defined. */ | |
103 | ||
f8893e47 | 104 | static struct c_arg_info *current_function_arg_info; |
7b112487 | 105 | |
bc4b653b JM |
106 | /* The obstack on which parser and related data structures, which are |
107 | not live beyond their top-level declaration or definition, are | |
108 | allocated. */ | |
109 | struct obstack parser_obstack; | |
110 | ||
8f17b5c5 MM |
111 | /* The current statement tree. */ |
112 | ||
e2500fed | 113 | static GTY(()) struct stmt_tree_s c_stmt_tree; |
8f17b5c5 | 114 | |
6614fd40 | 115 | /* State saving variables. */ |
506e2710 RH |
116 | tree c_break_label; |
117 | tree c_cont_label; | |
e13e48e7 | 118 | |
f75fbaf7 ZW |
119 | /* A list of decls to be made automatically visible in each file scope. */ |
120 | static GTY(()) tree visible_builtins; | |
121 | ||
51e29401 RS |
122 | /* Set to 0 at beginning of a function definition, set to 1 if |
123 | a return statement that specifies a return value is seen. */ | |
124 | ||
125 | int current_function_returns_value; | |
126 | ||
127 | /* Set to 0 at beginning of a function definition, set to 1 if | |
128 | a return statement with no argument is seen. */ | |
129 | ||
130 | int current_function_returns_null; | |
131 | ||
5ce89b2e JM |
132 | /* Set to 0 at beginning of a function definition, set to 1 if |
133 | a call to a noreturn function is seen. */ | |
134 | ||
135 | int current_function_returns_abnormally; | |
136 | ||
51e29401 RS |
137 | /* Set to nonzero by `grokdeclarator' for a function |
138 | whose return type is defaulted, if warnings for this are desired. */ | |
139 | ||
140 | static int warn_about_return_type; | |
141 | ||
73aea290 JM |
142 | /* Nonzero when the current toplevel function contains a declaration |
143 | of a nested function which is never defined. */ | |
144 | ||
145 | static bool undef_nested_function; | |
146 | ||
acf0174b JJ |
147 | /* If non-zero, implicit "omp declare target" attribute is added into the |
148 | attribute lists. */ | |
149 | int current_omp_declare_target_attribute; | |
51e29401 | 150 | \f |
f75fbaf7 ZW |
151 | /* Each c_binding structure describes one binding of an identifier to |
152 | a decl. All the decls in a scope - irrespective of namespace - are | |
153 | chained together by the ->prev field, which (as the name implies) | |
154 | runs in reverse order. All the decls in a given namespace bound to | |
155 | a given identifier are chained by the ->shadowed field, which runs | |
9aaabf8a | 156 | from inner to outer scopes. |
f75fbaf7 ZW |
157 | |
158 | The ->decl field usually points to a DECL node, but there are two | |
159 | exceptions. In the namespace of type tags, the bound entity is a | |
160 | RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared | |
161 | identifier is encountered, it is bound to error_mark_node to | |
162 | suppress further errors about that identifier in the current | |
9aaabf8a ZW |
163 | function. |
164 | ||
e1b7793c | 165 | The ->u.type field stores the type of the declaration in this scope; |
0b410f0b JM |
166 | if NULL, the type is the type of the ->decl field. This is only of |
167 | relevance for objects with external or internal linkage which may | |
168 | be redeclared in inner scopes, forming composite types that only | |
169 | persist for the duration of those scopes. In the external scope, | |
170 | this stores the composite of all the types declared for this | |
171 | object, visible or not. The ->inner_comp field (used only at file | |
172 | scope) stores whether an incomplete array type at file scope was | |
173 | completed at an inner scope to an array size other than 1. | |
174 | ||
e1b7793c ILT |
175 | The ->u.label field is used for labels. It points to a structure |
176 | which stores additional information used for warnings. | |
177 | ||
9aaabf8a ZW |
178 | The depth field is copied from the scope structure that holds this |
179 | decl. It is used to preserve the proper ordering of the ->shadowed | |
180 | field (see bind()) and also for a handful of special-case checks. | |
181 | Finally, the invisible bit is true for a decl which should be | |
182 | ignored for purposes of normal name lookup, and the nested bit is | |
183 | true for a decl that's been bound a second time in an inner scope; | |
184 | in all such cases, the binding in the outer scope will have its | |
185 | invisible bit true. */ | |
f75fbaf7 | 186 | |
d1b38208 | 187 | struct GTY((chain_next ("%h.prev"))) c_binding { |
e1b7793c ILT |
188 | union GTY(()) { /* first so GTY desc can use decl */ |
189 | tree GTY((tag ("0"))) type; /* the type in this scope */ | |
190 | struct c_label_vars * GTY((tag ("1"))) label; /* for warnings */ | |
191 | } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u; | |
f75fbaf7 ZW |
192 | tree decl; /* the decl bound */ |
193 | tree id; /* the identifier it's bound to */ | |
194 | struct c_binding *prev; /* the previous decl in this scope */ | |
195 | struct c_binding *shadowed; /* the innermost decl shadowed by this one */ | |
9aaabf8a ZW |
196 | unsigned int depth : 28; /* depth of this scope */ |
197 | BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */ | |
198 | BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */ | |
0b410f0b | 199 | BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */ |
dc491a25 | 200 | BOOL_BITFIELD in_struct : 1; /* currently defined as struct field */ |
b3f27c15 | 201 | location_t locus; /* location for nested bindings */ |
f75fbaf7 | 202 | }; |
9aaabf8a ZW |
203 | #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth) |
204 | #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth) | |
205 | #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/) | |
206 | #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/) | |
f75fbaf7 | 207 | |
18d5f982 ZW |
208 | /* Each C symbol points to three linked lists of c_binding structures. |
209 | These describe the values of the identifier in the three different | |
210 | namespaces defined by the language. */ | |
211 | ||
d1b38208 | 212 | struct GTY(()) lang_identifier { |
18d5f982 ZW |
213 | struct c_common_identifier common_id; |
214 | struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */ | |
215 | struct c_binding *tag_binding; /* struct/union/enum tags */ | |
216 | struct c_binding *label_binding; /* labels */ | |
217 | }; | |
218 | ||
219 | /* Validate c-lang.c's assumptions. */ | |
220 | extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate | |
221 | [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1]; | |
222 | ||
ddc8de03 PM |
223 | /* The binding oracle; see c-tree.h. */ |
224 | void (*c_binding_oracle) (enum c_oracle_request, tree identifier); | |
225 | ||
226 | /* This flag is set on an identifier if we have previously asked the | |
227 | binding oracle for this identifier's symbol binding. */ | |
228 | #define I_SYMBOL_CHECKED(node) \ | |
229 | (TREE_LANG_FLAG_4 (IDENTIFIER_NODE_CHECK (node))) | |
230 | ||
231 | static inline struct c_binding* * | |
232 | i_symbol_binding (tree node) | |
233 | { | |
234 | struct lang_identifier *lid | |
235 | = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node); | |
236 | ||
237 | if (lid->symbol_binding == NULL | |
238 | && c_binding_oracle != NULL | |
239 | && !I_SYMBOL_CHECKED (node)) | |
240 | { | |
241 | /* Set the "checked" flag first, to avoid infinite recursion | |
242 | when the binding oracle calls back into gcc. */ | |
243 | I_SYMBOL_CHECKED (node) = 1; | |
244 | c_binding_oracle (C_ORACLE_SYMBOL, node); | |
245 | } | |
246 | ||
247 | return &lid->symbol_binding; | |
248 | } | |
249 | ||
250 | #define I_SYMBOL_BINDING(node) (*i_symbol_binding (node)) | |
251 | ||
252 | #define I_SYMBOL_DECL(node) \ | |
253 | (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0) | |
254 | ||
255 | /* This flag is set on an identifier if we have previously asked the | |
256 | binding oracle for this identifier's tag binding. */ | |
257 | #define I_TAG_CHECKED(node) \ | |
258 | (TREE_LANG_FLAG_5 (IDENTIFIER_NODE_CHECK (node))) | |
259 | ||
260 | static inline struct c_binding ** | |
261 | i_tag_binding (tree node) | |
262 | { | |
263 | struct lang_identifier *lid | |
264 | = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node); | |
265 | ||
266 | if (lid->tag_binding == NULL | |
267 | && c_binding_oracle != NULL | |
268 | && !I_TAG_CHECKED (node)) | |
269 | { | |
270 | /* Set the "checked" flag first, to avoid infinite recursion | |
271 | when the binding oracle calls back into gcc. */ | |
272 | I_TAG_CHECKED (node) = 1; | |
273 | c_binding_oracle (C_ORACLE_TAG, node); | |
274 | } | |
275 | ||
276 | return &lid->tag_binding; | |
277 | } | |
278 | ||
279 | #define I_TAG_BINDING(node) (*i_tag_binding (node)) | |
280 | ||
281 | #define I_TAG_DECL(node) \ | |
282 | (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0) | |
283 | ||
284 | /* This flag is set on an identifier if we have previously asked the | |
285 | binding oracle for this identifier's label binding. */ | |
286 | #define I_LABEL_CHECKED(node) \ | |
287 | (TREE_LANG_FLAG_6 (IDENTIFIER_NODE_CHECK (node))) | |
288 | ||
289 | static inline struct c_binding ** | |
290 | i_label_binding (tree node) | |
291 | { | |
292 | struct lang_identifier *lid | |
293 | = (struct lang_identifier *) IDENTIFIER_NODE_CHECK (node); | |
294 | ||
295 | if (lid->label_binding == NULL | |
296 | && c_binding_oracle != NULL | |
297 | && !I_LABEL_CHECKED (node)) | |
298 | { | |
299 | /* Set the "checked" flag first, to avoid infinite recursion | |
300 | when the binding oracle calls back into gcc. */ | |
301 | I_LABEL_CHECKED (node) = 1; | |
302 | c_binding_oracle (C_ORACLE_LABEL, node); | |
303 | } | |
304 | ||
305 | return &lid->label_binding; | |
306 | } | |
307 | ||
308 | #define I_LABEL_BINDING(node) (*i_label_binding (node)) | |
309 | ||
310 | #define I_LABEL_DECL(node) \ | |
311 | (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0) | |
312 | ||
18d5f982 ZW |
313 | /* The resulting tree type. */ |
314 | ||
d1b38208 | 315 | union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"), |
56300785 | 316 | chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node |
d1b38208 | 317 | { |
18d5f982 ZW |
318 | union tree_node GTY ((tag ("0"), |
319 | desc ("tree_node_structure (&%h)"))) | |
320 | generic; | |
321 | struct lang_identifier GTY ((tag ("1"))) identifier; | |
322 | }; | |
323 | ||
e1b7793c ILT |
324 | /* Track bindings and other things that matter for goto warnings. For |
325 | efficiency, we do not gather all the decls at the point of | |
326 | definition. Instead, we point into the bindings structure. As | |
327 | scopes are popped, we update these structures and gather the decls | |
328 | that matter at that time. */ | |
329 | ||
330 | struct GTY(()) c_spot_bindings { | |
331 | /* The currently open scope which holds bindings defined when the | |
332 | label was defined or the goto statement was found. */ | |
333 | struct c_scope *scope; | |
334 | /* The bindings in the scope field which were defined at the point | |
335 | of the label or goto. This lets us look at older or newer | |
336 | bindings in the scope, as appropriate. */ | |
337 | struct c_binding *bindings_in_scope; | |
338 | /* The number of statement expressions that have started since this | |
339 | label or goto statement was defined. This is zero if we are at | |
340 | the same statement expression level. It is positive if we are in | |
341 | a statement expression started since this spot. It is negative | |
342 | if this spot was in a statement expression and we have left | |
343 | it. */ | |
344 | int stmt_exprs; | |
345 | /* Whether we started in a statement expression but are no longer in | |
346 | it. This is set to true if stmt_exprs ever goes negative. */ | |
347 | bool left_stmt_expr; | |
348 | }; | |
349 | ||
350 | /* This structure is used to keep track of bindings seen when a goto | |
351 | statement is defined. This is only used if we see the goto | |
352 | statement before we see the label. */ | |
353 | ||
354 | struct GTY(()) c_goto_bindings { | |
355 | /* The location of the goto statement. */ | |
356 | location_t loc; | |
357 | /* The bindings of the goto statement. */ | |
358 | struct c_spot_bindings goto_bindings; | |
359 | }; | |
360 | ||
361 | typedef struct c_goto_bindings *c_goto_bindings_p; | |
e1b7793c ILT |
362 | |
363 | /* The additional information we keep track of for a label binding. | |
364 | These fields are updated as scopes are popped. */ | |
365 | ||
366 | struct GTY(()) c_label_vars { | |
367 | /* The shadowed c_label_vars, when one label shadows another (which | |
368 | can only happen using a __label__ declaration). */ | |
369 | struct c_label_vars *shadowed; | |
370 | /* The bindings when the label was defined. */ | |
371 | struct c_spot_bindings label_bindings; | |
372 | /* A list of decls that we care about: decls about which we should | |
373 | warn if a goto branches to this label from later in the function. | |
374 | Decls are added to this list as scopes are popped. We only add | |
375 | the decls that matter. */ | |
9771b263 | 376 | vec<tree, va_gc> *decls_in_scope; |
e1b7793c ILT |
377 | /* A list of goto statements to this label. This is only used for |
378 | goto statements seen before the label was defined, so that we can | |
379 | issue appropriate warnings for them. */ | |
9771b263 | 380 | vec<c_goto_bindings_p, va_gc> *gotos; |
e1b7793c ILT |
381 | }; |
382 | ||
f75fbaf7 ZW |
383 | /* Each c_scope structure describes the complete contents of one |
384 | scope. Four scopes are distinguished specially: the innermost or | |
385 | current scope, the innermost function scope, the file scope (always | |
386 | the second to outermost) and the outermost or external scope. | |
f91f41b2 ZW |
387 | |
388 | Most declarations are recorded in the current scope. | |
389 | ||
390 | All normal label declarations are recorded in the innermost | |
391 | function scope, as are bindings of undeclared identifiers to | |
392 | error_mark_node. (GCC permits nested functions as an extension, | |
393 | hence the 'innermost' qualifier.) Explicitly declared labels | |
394 | (using the __label__ extension) appear in the current scope. | |
395 | ||
f75fbaf7 | 396 | Being in the file scope (current_scope == file_scope) causes |
f91f41b2 ZW |
397 | special behavior in several places below. Also, under some |
398 | conditions the Objective-C front end records declarations in the | |
f75fbaf7 ZW |
399 | file scope even though that isn't the current scope. |
400 | ||
401 | All declarations with external linkage are recorded in the external | |
402 | scope, even if they aren't visible there; this models the fact that | |
403 | such declarations are visible to the entire program, and (with a | |
404 | bit of cleverness, see pushdecl) allows diagnosis of some violations | |
405 | of C99 6.2.2p7 and 6.2.7p2: | |
406 | ||
407 | If, within the same translation unit, the same identifier appears | |
408 | with both internal and external linkage, the behavior is | |
409 | undefined. | |
f91f41b2 | 410 | |
f75fbaf7 ZW |
411 | All declarations that refer to the same object or function shall |
412 | have compatible type; otherwise, the behavior is undefined. | |
413 | ||
414 | Initially only the built-in declarations, which describe compiler | |
415 | intrinsic functions plus a subset of the standard library, are in | |
416 | this scope. | |
417 | ||
418 | The order of the blocks list matters, and it is frequently appended | |
419 | to. To avoid having to walk all the way to the end of the list on | |
420 | each insertion, or reverse the list later, we maintain a pointer to | |
421 | the last list entry. (FIXME: It should be feasible to use a reversed | |
422 | list here.) | |
423 | ||
424 | The bindings list is strictly in reverse order of declarations; | |
425 | pop_scope relies on this. */ | |
f91f41b2 | 426 | |
51e29401 | 427 | |
d1b38208 | 428 | struct GTY((chain_next ("%h.outer"))) c_scope { |
14077d68 ZW |
429 | /* The scope containing this one. */ |
430 | struct c_scope *outer; | |
431 | ||
432 | /* The next outermost function scope. */ | |
433 | struct c_scope *outer_function; | |
434 | ||
f75fbaf7 ZW |
435 | /* All bindings in this scope. */ |
436 | struct c_binding *bindings; | |
14077d68 ZW |
437 | |
438 | /* For each scope (except the global one), a chain of BLOCK nodes | |
439 | for all the scopes that were entered and exited one level down. */ | |
440 | tree blocks; | |
f91f41b2 | 441 | tree blocks_last; |
14077d68 | 442 | |
f75fbaf7 ZW |
443 | /* The depth of this scope. Used to keep the ->shadowed chain of |
444 | bindings sorted innermost to outermost. */ | |
445 | unsigned int depth : 28; | |
446 | ||
14077d68 ZW |
447 | /* True if we are currently filling this scope with parameter |
448 | declarations. */ | |
1c62e7b2 | 449 | BOOL_BITFIELD parm_flag : 1; |
14077d68 | 450 | |
52ffd86e MS |
451 | /* True if we saw [*] in this scope. Used to give an error messages |
452 | if these appears in a function definition. */ | |
453 | BOOL_BITFIELD had_vla_unspec : 1; | |
454 | ||
55d54003 ZW |
455 | /* True if we already complained about forward parameter decls |
456 | in this scope. This prevents double warnings on | |
457 | foo (int a; int b; ...) */ | |
1c62e7b2 | 458 | BOOL_BITFIELD warned_forward_parm_decls : 1; |
55d54003 | 459 | |
14077d68 ZW |
460 | /* True if this is the outermost block scope of a function body. |
461 | This scope contains the parameters, the local variables declared | |
462 | in the outermost block, and all the labels (except those in | |
463 | nested functions, or declared at block scope with __label__). */ | |
1c62e7b2 | 464 | BOOL_BITFIELD function_body : 1; |
14077d68 ZW |
465 | |
466 | /* True means make a BLOCK for this scope no matter what. */ | |
1c62e7b2 | 467 | BOOL_BITFIELD keep : 1; |
6ec637a4 JJ |
468 | |
469 | /* True means that an unsuffixed float constant is _Decimal64. */ | |
470 | BOOL_BITFIELD float_const_decimal64 : 1; | |
e1b7793c ILT |
471 | |
472 | /* True if this scope has any label bindings. This is used to speed | |
473 | up searching for labels when popping scopes, particularly since | |
474 | labels are normally only found at function scope. */ | |
475 | BOOL_BITFIELD has_label_bindings : 1; | |
744f0946 ILT |
476 | |
477 | /* True if we should issue a warning if a goto statement crosses any | |
478 | of the bindings. We still need to check the list of bindings to | |
479 | find the specific ones we need to warn about. This is true if | |
480 | decl_jump_unsafe would return true for any of the bindings. This | |
481 | is used to avoid looping over all the bindings unnecessarily. */ | |
482 | BOOL_BITFIELD has_jump_unsafe_decl : 1; | |
14077d68 | 483 | }; |
51e29401 | 484 | |
f8521984 | 485 | /* The scope currently in effect. */ |
6645c3fa | 486 | |
f8521984 | 487 | static GTY(()) struct c_scope *current_scope; |
51e29401 | 488 | |
14e33ee8 ZW |
489 | /* The innermost function scope. Ordinary (not explicitly declared) |
490 | labels, bindings to error_mark_node, and the lazily-created | |
491 | bindings of __func__ and its friends get this scope. */ | |
14077d68 | 492 | |
f8521984 | 493 | static GTY(()) struct c_scope *current_function_scope; |
14e33ee8 | 494 | |
f75fbaf7 ZW |
495 | /* The C file scope. This is reset for each input translation unit. */ |
496 | ||
497 | static GTY(()) struct c_scope *file_scope; | |
498 | ||
499 | /* The outermost scope. This is used for all declarations with | |
500 | external linkage, and only these, hence the name. */ | |
501 | ||
502 | static GTY(()) struct c_scope *external_scope; | |
503 | ||
504 | /* A chain of c_scope structures awaiting reuse. */ | |
505 | ||
1431042e | 506 | static GTY((deletable)) struct c_scope *scope_freelist; |
f75fbaf7 ZW |
507 | |
508 | /* A chain of c_binding structures awaiting reuse. */ | |
51e29401 | 509 | |
1431042e | 510 | static GTY((deletable)) struct c_binding *binding_freelist; |
51e29401 | 511 | |
3d93cdfa | 512 | /* Append VAR to LIST in scope SCOPE. */ |
f91f41b2 ZW |
513 | #define SCOPE_LIST_APPEND(scope, list, decl) do { \ |
514 | struct c_scope *s_ = (scope); \ | |
515 | tree d_ = (decl); \ | |
516 | if (s_->list##_last) \ | |
87caf699 | 517 | BLOCK_CHAIN (s_->list##_last) = d_; \ |
f91f41b2 ZW |
518 | else \ |
519 | s_->list = d_; \ | |
520 | s_->list##_last = d_; \ | |
521 | } while (0) | |
522 | ||
523 | /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */ | |
524 | #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \ | |
525 | struct c_scope *t_ = (tscope); \ | |
526 | struct c_scope *f_ = (fscope); \ | |
527 | if (t_->to##_last) \ | |
87caf699 | 528 | BLOCK_CHAIN (t_->to##_last) = f_->from; \ |
f91f41b2 ZW |
529 | else \ |
530 | t_->to = f_->from; \ | |
531 | t_->to##_last = f_->from##_last; \ | |
532 | } while (0) | |
533 | ||
991d6621 JM |
534 | /* A c_inline_static structure stores details of a static identifier |
535 | referenced in a definition of a function that may be an inline | |
536 | definition if no subsequent declaration of that function uses | |
537 | "extern" or does not use "inline". */ | |
538 | ||
539 | struct GTY((chain_next ("%h.next"))) c_inline_static { | |
540 | /* The location for a diagnostic. */ | |
541 | location_t location; | |
542 | ||
543 | /* The function that may be an inline definition. */ | |
544 | tree function; | |
545 | ||
546 | /* The object or function referenced. */ | |
547 | tree static_decl; | |
548 | ||
549 | /* What sort of reference this is. */ | |
550 | enum c_inline_static_type type; | |
551 | ||
552 | /* The next such structure or NULL. */ | |
553 | struct c_inline_static *next; | |
554 | }; | |
555 | ||
556 | /* List of static identifiers used or referenced in functions that may | |
557 | be inline definitions. */ | |
558 | static GTY(()) struct c_inline_static *c_inline_statics; | |
559 | ||
f8521984 | 560 | /* True means unconditionally make a BLOCK for the next scope pushed. */ |
51e29401 | 561 | |
14e33ee8 | 562 | static bool keep_next_level_flag; |
51e29401 | 563 | |
f75fbaf7 | 564 | /* True means the next call to push_scope will be the outermost scope |
a8ccdffe ZW |
565 | of a function body, so do not push a new scope, merely cease |
566 | expecting parameter decls. */ | |
6645c3fa | 567 | |
a8ccdffe | 568 | static bool next_is_function_body; |
51e29401 | 569 | |
9771b263 | 570 | /* A vector of pointers to c_binding structures. */ |
dc491a25 ILT |
571 | |
572 | typedef struct c_binding *c_binding_ptr; | |
dc491a25 ILT |
573 | |
574 | /* Information that we keep for a struct or union while it is being | |
575 | parsed. */ | |
576 | ||
6c1dae73 | 577 | class c_struct_parse_info |
dc491a25 | 578 | { |
6c1dae73 | 579 | public: |
dc491a25 ILT |
580 | /* If warn_cxx_compat, a list of types defined within this |
581 | struct. */ | |
bf4fa671 | 582 | auto_vec<tree> struct_types; |
dc491a25 ILT |
583 | /* If warn_cxx_compat, a list of field names which have bindings, |
584 | and which are defined in this struct, but which are not defined | |
585 | in any enclosing struct. This is used to clear the in_struct | |
586 | field of the c_bindings structure. */ | |
bf4fa671 | 587 | auto_vec<c_binding_ptr> fields; |
dc491a25 ILT |
588 | /* If warn_cxx_compat, a list of typedef names used when defining |
589 | fields in this struct. */ | |
bf4fa671 | 590 | auto_vec<tree> typedefs_seen; |
dc491a25 ILT |
591 | }; |
592 | ||
593 | /* Information for the struct or union currently being parsed, or | |
594 | NULL if not parsing a struct or union. */ | |
99b1c316 | 595 | static class c_struct_parse_info *struct_parse_info; |
dc491a25 | 596 | |
51e29401 | 597 | /* Forward declarations. */ |
f75fbaf7 | 598 | static tree lookup_name_in_scope (tree, struct c_scope *); |
c2255bc4 | 599 | static tree c_make_fname_decl (location_t, tree, int); |
deb176fa JM |
600 | static tree grokdeclarator (const struct c_declarator *, |
601 | struct c_declspecs *, | |
928c19bb JM |
602 | enum decl_context, bool, tree *, tree *, tree *, |
603 | bool *, enum deprecated_states); | |
f8893e47 | 604 | static tree grokparms (struct c_arg_info *, bool); |
35b1a6fa | 605 | static void layout_array_type (tree); |
35aff4fb MP |
606 | static void warn_defaults_to (location_t, int, const char *, ...) |
607 | ATTRIBUTE_GCC_DIAG(3,4); | |
cd5da983 | 608 | static const char *header_for_builtin_fn (enum built_in_function); |
51e29401 | 609 | \f |
ed3d0b14 ILT |
610 | /* T is a statement. Add it to the statement-tree. This is the |
611 | C/ObjC version--C++ has a slightly different version of this | |
612 | function. */ | |
613 | ||
614 | tree | |
615 | add_stmt (tree t) | |
616 | { | |
617 | enum tree_code code = TREE_CODE (t); | |
618 | ||
07beea0d | 619 | if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR) |
ed3d0b14 ILT |
620 | { |
621 | if (!EXPR_HAS_LOCATION (t)) | |
622 | SET_EXPR_LOCATION (t, input_location); | |
623 | } | |
624 | ||
625 | if (code == LABEL_EXPR || code == CASE_LABEL_EXPR) | |
626 | STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1; | |
627 | ||
628 | /* Add T to the statement-tree. Non-side-effect statements need to be | |
629 | recorded during statement expressions. */ | |
38e01f9e NF |
630 | if (!building_stmt_list_p ()) |
631 | push_stmt_list (); | |
ed3d0b14 ILT |
632 | append_to_statement_list_force (t, &cur_stmt_list); |
633 | ||
634 | return t; | |
635 | } | |
412cd719 TG |
636 | \f |
637 | /* Build a pointer type using the default pointer mode. */ | |
638 | ||
639 | static tree | |
640 | c_build_pointer_type (tree to_type) | |
641 | { | |
642 | addr_space_t as = to_type == error_mark_node? ADDR_SPACE_GENERIC | |
643 | : TYPE_ADDR_SPACE (to_type); | |
ef4bddc2 | 644 | machine_mode pointer_mode; |
412cd719 TG |
645 | |
646 | if (as != ADDR_SPACE_GENERIC || c_default_pointer_mode == VOIDmode) | |
647 | pointer_mode = targetm.addr_space.pointer_mode (as); | |
648 | else | |
649 | pointer_mode = c_default_pointer_mode; | |
650 | return build_pointer_type_for_mode (to_type, pointer_mode, false); | |
651 | } | |
652 | ||
ed3d0b14 | 653 | \f |
744f0946 ILT |
654 | /* Return true if we will want to say something if a goto statement |
655 | crosses DECL. */ | |
656 | ||
657 | static bool | |
658 | decl_jump_unsafe (tree decl) | |
659 | { | |
b504a918 | 660 | if (error_operand_p (decl)) |
744f0946 ILT |
661 | return false; |
662 | ||
fe509359 JJ |
663 | /* Don't warn for compound literals. If a goto statement crosses |
664 | their initialization, it should cross also all the places where | |
665 | the complit is used or where the complit address might be saved | |
666 | into some variable, so code after the label to which goto jumps | |
667 | should not be able to refer to the compound literal. */ | |
668 | if (VAR_P (decl) && C_DECL_COMPOUND_LITERAL_P (decl)) | |
669 | return false; | |
670 | ||
744f0946 | 671 | /* Always warn about crossing variably modified types. */ |
0ae9bd27 | 672 | if ((VAR_P (decl) || TREE_CODE (decl) == TYPE_DECL) |
744f0946 ILT |
673 | && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) |
674 | return true; | |
675 | ||
676 | /* Otherwise, only warn if -Wgoto-misses-init and this is an | |
677 | initialized automatic decl. */ | |
678 | if (warn_jump_misses_init | |
0ae9bd27 | 679 | && VAR_P (decl) |
744f0946 ILT |
680 | && !TREE_STATIC (decl) |
681 | && DECL_INITIAL (decl) != NULL_TREE) | |
682 | return true; | |
683 | ||
684 | return false; | |
685 | } | |
686 | \f | |
e23bd218 | 687 | |
51e29401 | 688 | void |
35b1a6fa | 689 | c_print_identifier (FILE *file, tree node, int indent) |
51e29401 | 690 | { |
ddc8de03 PM |
691 | void (*save) (enum c_oracle_request, tree identifier); |
692 | ||
693 | /* Temporarily hide any binding oracle. Without this, calls to | |
694 | debug_tree from the debugger will end up calling into the oracle, | |
695 | making for a confusing debug session. As the oracle isn't needed | |
696 | here for normal operation, it's simplest to suppress it. */ | |
697 | save = c_binding_oracle; | |
698 | c_binding_oracle = NULL; | |
699 | ||
f75fbaf7 ZW |
700 | print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4); |
701 | print_node (file, "tag", I_TAG_DECL (node), indent + 4); | |
702 | print_node (file, "label", I_LABEL_DECL (node), indent + 4); | |
eea1139b | 703 | if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN) |
0e5921e8 ZW |
704 | { |
705 | tree rid = ridpointers[C_RID_CODE (node)]; | |
706 | indent_to (file, indent + 4); | |
edb89024 | 707 | fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"", |
75b6f3fd | 708 | (void *) rid, IDENTIFIER_POINTER (rid)); |
0e5921e8 | 709 | } |
ddc8de03 PM |
710 | |
711 | c_binding_oracle = save; | |
51e29401 | 712 | } |
f75fbaf7 ZW |
713 | |
714 | /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL, | |
715 | which may be any of several kinds of DECL or TYPE or error_mark_node, | |
716 | in the scope SCOPE. */ | |
717 | static void | |
b3f27c15 JJ |
718 | bind (tree name, tree decl, struct c_scope *scope, bool invisible, |
719 | bool nested, location_t locus) | |
f75fbaf7 ZW |
720 | { |
721 | struct c_binding *b, **here; | |
722 | ||
723 | if (binding_freelist) | |
724 | { | |
725 | b = binding_freelist; | |
726 | binding_freelist = b->prev; | |
727 | } | |
728 | else | |
766090c2 | 729 | b = ggc_alloc<c_binding> (); |
f75fbaf7 ZW |
730 | |
731 | b->shadowed = 0; | |
732 | b->decl = decl; | |
733 | b->id = name; | |
9aaabf8a ZW |
734 | b->depth = scope->depth; |
735 | b->invisible = invisible; | |
736 | b->nested = nested; | |
0b410f0b | 737 | b->inner_comp = 0; |
dc491a25 | 738 | b->in_struct = 0; |
b3f27c15 | 739 | b->locus = locus; |
0b410f0b | 740 | |
e1b7793c | 741 | b->u.type = NULL; |
f75fbaf7 ZW |
742 | |
743 | b->prev = scope->bindings; | |
744 | scope->bindings = b; | |
745 | ||
744f0946 ILT |
746 | if (decl_jump_unsafe (decl)) |
747 | scope->has_jump_unsafe_decl = 1; | |
748 | ||
f75fbaf7 ZW |
749 | if (!name) |
750 | return; | |
751 | ||
752 | switch (TREE_CODE (decl)) | |
753 | { | |
754 | case LABEL_DECL: here = &I_LABEL_BINDING (name); break; | |
755 | case ENUMERAL_TYPE: | |
756 | case UNION_TYPE: | |
757 | case RECORD_TYPE: here = &I_TAG_BINDING (name); break; | |
758 | case VAR_DECL: | |
759 | case FUNCTION_DECL: | |
760 | case TYPE_DECL: | |
761 | case CONST_DECL: | |
762 | case PARM_DECL: | |
763 | case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break; | |
764 | ||
765 | default: | |
366de0ce | 766 | gcc_unreachable (); |
f75fbaf7 ZW |
767 | } |
768 | ||
769 | /* Locate the appropriate place in the chain of shadowed decls | |
770 | to insert this binding. Normally, scope == current_scope and | |
771 | this does nothing. */ | |
9aaabf8a | 772 | while (*here && (*here)->depth > scope->depth) |
f75fbaf7 ZW |
773 | here = &(*here)->shadowed; |
774 | ||
775 | b->shadowed = *here; | |
776 | *here = b; | |
777 | } | |
778 | ||
779 | /* Clear the binding structure B, stick it on the binding_freelist, | |
780 | and return the former value of b->prev. This is used by pop_scope | |
781 | and get_parm_info to iterate destructively over all the bindings | |
782 | from a given scope. */ | |
783 | static struct c_binding * | |
784 | free_binding_and_advance (struct c_binding *b) | |
785 | { | |
786 | struct c_binding *prev = b->prev; | |
787 | ||
9aaabf8a | 788 | memset (b, 0, sizeof (struct c_binding)); |
f75fbaf7 ZW |
789 | b->prev = binding_freelist; |
790 | binding_freelist = b; | |
791 | ||
792 | return prev; | |
793 | } | |
794 | ||
e1b7793c ILT |
795 | /* Bind a label. Like bind, but skip fields which aren't used for |
796 | labels, and add the LABEL_VARS value. */ | |
797 | static void | |
798 | bind_label (tree name, tree label, struct c_scope *scope, | |
799 | struct c_label_vars *label_vars) | |
800 | { | |
801 | struct c_binding *b; | |
802 | ||
803 | bind (name, label, scope, /*invisible=*/false, /*nested=*/false, | |
804 | UNKNOWN_LOCATION); | |
805 | ||
806 | scope->has_label_bindings = true; | |
807 | ||
808 | b = scope->bindings; | |
809 | gcc_assert (b->decl == label); | |
810 | label_vars->shadowed = b->u.label; | |
811 | b->u.label = label_vars; | |
812 | } | |
51e29401 | 813 | \f |
b4892310 | 814 | /* Hook called at end of compilation to assume 1 elt |
f8521984 | 815 | for a file-scope tentative array defn that wasn't complete before. */ |
6645c3fa | 816 | |
b4892310 | 817 | void |
35b1a6fa | 818 | c_finish_incomplete_decl (tree decl) |
b4892310 | 819 | { |
0ae9bd27 | 820 | if (VAR_P (decl)) |
b4892310 RS |
821 | { |
822 | tree type = TREE_TYPE (decl); | |
5cfac96e RK |
823 | if (type != error_mark_node |
824 | && TREE_CODE (type) == ARRAY_TYPE | |
3f75a254 | 825 | && !DECL_EXTERNAL (decl) |
3fa8871b | 826 | && TYPE_DOMAIN (type) == NULL_TREE) |
b4892310 | 827 | { |
c2255bc4 AH |
828 | warning_at (DECL_SOURCE_LOCATION (decl), |
829 | 0, "array %q+D assumed to have one element", decl); | |
5cfac96e | 830 | |
aab038d5 | 831 | complete_array_type (&TREE_TYPE (decl), NULL_TREE, true); |
b4892310 | 832 | |
156030d3 | 833 | relayout_decl (decl); |
b4892310 RS |
834 | } |
835 | } | |
836 | } | |
837 | \f | |
991d6621 JM |
838 | /* Record that inline function FUNC contains a reference (location |
839 | LOC) to static DECL (file-scope or function-local according to | |
840 | TYPE). */ | |
841 | ||
842 | void | |
843 | record_inline_static (location_t loc, tree func, tree decl, | |
844 | enum c_inline_static_type type) | |
845 | { | |
766090c2 | 846 | c_inline_static *csi = ggc_alloc<c_inline_static> (); |
991d6621 JM |
847 | csi->location = loc; |
848 | csi->function = func; | |
849 | csi->static_decl = decl; | |
850 | csi->type = type; | |
851 | csi->next = c_inline_statics; | |
852 | c_inline_statics = csi; | |
853 | } | |
854 | ||
855 | /* Check for references to static declarations in inline functions at | |
856 | the end of the translation unit and diagnose them if the functions | |
857 | are still inline definitions. */ | |
858 | ||
859 | static void | |
860 | check_inline_statics (void) | |
861 | { | |
862 | struct c_inline_static *csi; | |
863 | for (csi = c_inline_statics; csi; csi = csi->next) | |
864 | { | |
865 | if (DECL_EXTERNAL (csi->function)) | |
866 | switch (csi->type) | |
867 | { | |
868 | case csi_internal: | |
869 | pedwarn (csi->location, 0, | |
870 | "%qD is static but used in inline function %qD " | |
871 | "which is not static", csi->static_decl, csi->function); | |
872 | break; | |
873 | case csi_modifiable: | |
874 | pedwarn (csi->location, 0, | |
875 | "%q+D is static but declared in inline function %qD " | |
876 | "which is not static", csi->static_decl, csi->function); | |
877 | break; | |
878 | default: | |
879 | gcc_unreachable (); | |
880 | } | |
881 | } | |
882 | c_inline_statics = NULL; | |
883 | } | |
884 | \f | |
e1b7793c ILT |
885 | /* Fill in a c_spot_bindings structure. If DEFINING is true, set it |
886 | for the current state, otherwise set it to uninitialized. */ | |
887 | ||
888 | static void | |
889 | set_spot_bindings (struct c_spot_bindings *p, bool defining) | |
890 | { | |
891 | if (defining) | |
892 | { | |
893 | p->scope = current_scope; | |
894 | p->bindings_in_scope = current_scope->bindings; | |
895 | } | |
896 | else | |
897 | { | |
898 | p->scope = NULL; | |
899 | p->bindings_in_scope = NULL; | |
900 | } | |
901 | p->stmt_exprs = 0; | |
902 | p->left_stmt_expr = false; | |
903 | } | |
904 | ||
e1b7793c ILT |
905 | /* Update spot bindings P as we pop out of SCOPE. Return true if we |
906 | should push decls for a label. */ | |
907 | ||
908 | static bool | |
909 | update_spot_bindings (struct c_scope *scope, struct c_spot_bindings *p) | |
910 | { | |
911 | if (p->scope != scope) | |
912 | { | |
913 | /* This label or goto is defined in some other scope, or it is a | |
914 | label which is not yet defined. There is nothing to | |
915 | update. */ | |
916 | return false; | |
917 | } | |
918 | ||
919 | /* Adjust the spot bindings to refer to the bindings already defined | |
920 | in the enclosing scope. */ | |
921 | p->scope = scope->outer; | |
922 | p->bindings_in_scope = p->scope->bindings; | |
923 | ||
924 | return true; | |
925 | } | |
926 | \f | |
264fa2db ZL |
927 | /* The Objective-C front-end often needs to determine the current scope. */ |
928 | ||
929 | void * | |
bc095846 | 930 | objc_get_current_scope (void) |
264fa2db ZL |
931 | { |
932 | return current_scope; | |
933 | } | |
934 | ||
935 | /* The following function is used only by Objective-C. It needs to live here | |
936 | because it accesses the innards of c_scope. */ | |
937 | ||
938 | void | |
939 | objc_mark_locals_volatile (void *enclosing_blk) | |
940 | { | |
941 | struct c_scope *scope; | |
f75fbaf7 | 942 | struct c_binding *b; |
e13e48e7 EC |
943 | |
944 | for (scope = current_scope; | |
264fa2db ZL |
945 | scope && scope != enclosing_blk; |
946 | scope = scope->outer) | |
947 | { | |
f75fbaf7 | 948 | for (b = scope->bindings; b; b = b->prev) |
58393038 | 949 | objc_volatilize_decl (b->decl); |
f75fbaf7 | 950 | |
264fa2db ZL |
951 | /* Do not climb up past the current function. */ |
952 | if (scope->function_body) | |
953 | break; | |
e13e48e7 EC |
954 | } |
955 | } | |
956 | ||
c99c0026 | 957 | /* Return true if we are in the global binding level. */ |
51e29401 | 958 | |
c99c0026 | 959 | bool |
35b1a6fa | 960 | global_bindings_p (void) |
51e29401 | 961 | { |
96703596 | 962 | return current_scope == file_scope; |
51e29401 RS |
963 | } |
964 | ||
f7584c81 DP |
965 | /* Return true if we're declaring parameters in an old-style function |
966 | declaration. */ | |
967 | ||
968 | bool | |
969 | old_style_parameter_scope (void) | |
970 | { | |
971 | /* If processing parameters and there is no function statement list, we | |
972 | * have an old-style function declaration. */ | |
973 | return (current_scope->parm_flag && !DECL_SAVED_TREE (current_function_decl)); | |
974 | } | |
975 | ||
51e29401 | 976 | void |
35b1a6fa | 977 | keep_next_level (void) |
51e29401 | 978 | { |
14e33ee8 | 979 | keep_next_level_flag = true; |
51e29401 RS |
980 | } |
981 | ||
6ec637a4 JJ |
982 | /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */ |
983 | ||
984 | void | |
985 | set_float_const_decimal64 (void) | |
986 | { | |
987 | current_scope->float_const_decimal64 = true; | |
988 | } | |
989 | ||
990 | /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */ | |
991 | ||
992 | void | |
993 | clear_float_const_decimal64 (void) | |
994 | { | |
995 | current_scope->float_const_decimal64 = false; | |
996 | } | |
997 | ||
998 | /* Return nonzero if an unsuffixed float constant is _Decimal64. */ | |
999 | ||
1000 | bool | |
1001 | float_const_decimal64_p (void) | |
1002 | { | |
1003 | return current_scope->float_const_decimal64; | |
1004 | } | |
1005 | ||
f8521984 | 1006 | /* Identify this scope as currently being filled with parameters. */ |
51e29401 RS |
1007 | |
1008 | void | |
eb1dfbb2 | 1009 | declare_parm_level (void) |
51e29401 | 1010 | { |
f8521984 | 1011 | current_scope->parm_flag = true; |
51e29401 RS |
1012 | } |
1013 | ||
51e29401 | 1014 | void |
f75fbaf7 | 1015 | push_scope (void) |
51e29401 | 1016 | { |
a8ccdffe | 1017 | if (next_is_function_body) |
51e29401 | 1018 | { |
339a28b9 ZW |
1019 | /* This is the transition from the parameters to the top level |
1020 | of the function body. These are the same scope | |
f8521984 | 1021 | (C99 6.2.1p4,6) so we do not push another scope structure. |
a8ccdffe ZW |
1022 | next_is_function_body is set only by store_parm_decls, which |
1023 | in turn is called when and only when we are about to | |
1024 | encounter the opening curly brace for the function body. | |
339a28b9 | 1025 | |
a8ccdffe ZW |
1026 | The outermost block of a function always gets a BLOCK node, |
1027 | because the debugging output routines expect that each | |
59e4e217 | 1028 | function has at least one BLOCK. */ |
f8521984 ZW |
1029 | current_scope->parm_flag = false; |
1030 | current_scope->function_body = true; | |
a8ccdffe | 1031 | current_scope->keep = true; |
f8521984 ZW |
1032 | current_scope->outer_function = current_function_scope; |
1033 | current_function_scope = current_scope; | |
14e33ee8 ZW |
1034 | |
1035 | keep_next_level_flag = false; | |
a8ccdffe | 1036 | next_is_function_body = false; |
6ec637a4 JJ |
1037 | |
1038 | /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */ | |
1039 | if (current_scope->outer) | |
1040 | current_scope->float_const_decimal64 | |
1041 | = current_scope->outer->float_const_decimal64; | |
1042 | else | |
1043 | current_scope->float_const_decimal64 = false; | |
51e29401 | 1044 | } |
339a28b9 ZW |
1045 | else |
1046 | { | |
f75fbaf7 ZW |
1047 | struct c_scope *scope; |
1048 | if (scope_freelist) | |
1049 | { | |
1050 | scope = scope_freelist; | |
1051 | scope_freelist = scope->outer; | |
1052 | } | |
1053 | else | |
766090c2 | 1054 | scope = ggc_cleared_alloc<c_scope> (); |
51e29401 | 1055 | |
6ec637a4 JJ |
1056 | /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */ |
1057 | if (current_scope) | |
1058 | scope->float_const_decimal64 = current_scope->float_const_decimal64; | |
1059 | else | |
1060 | scope->float_const_decimal64 = false; | |
1061 | ||
f8521984 ZW |
1062 | scope->keep = keep_next_level_flag; |
1063 | scope->outer = current_scope; | |
f75fbaf7 ZW |
1064 | scope->depth = current_scope ? (current_scope->depth + 1) : 0; |
1065 | ||
1066 | /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but | |
1067 | possible. */ | |
1068 | if (current_scope && scope->depth == 0) | |
1069 | { | |
1070 | scope->depth--; | |
72c4e4db | 1071 | sorry ("GCC supports only %u nested scopes", scope->depth); |
f75fbaf7 | 1072 | } |
118a3a8b | 1073 | |
f8521984 ZW |
1074 | current_scope = scope; |
1075 | keep_next_level_flag = false; | |
339a28b9 | 1076 | } |
0500d6f9 | 1077 | } |
6645c3fa | 1078 | |
e1b7793c ILT |
1079 | /* This is called when we are leaving SCOPE. For each label defined |
1080 | in SCOPE, add any appropriate decls to its decls_in_scope fields. | |
1081 | These are the decls whose initialization will be skipped by a goto | |
1082 | later in the function. */ | |
1083 | ||
1084 | static void | |
1085 | update_label_decls (struct c_scope *scope) | |
1086 | { | |
1087 | struct c_scope *s; | |
1088 | ||
1089 | s = scope; | |
1090 | while (s != NULL) | |
1091 | { | |
1092 | if (s->has_label_bindings) | |
1093 | { | |
1094 | struct c_binding *b; | |
1095 | ||
1096 | for (b = s->bindings; b != NULL; b = b->prev) | |
1097 | { | |
1098 | struct c_label_vars *label_vars; | |
1099 | struct c_binding *b1; | |
744f0946 | 1100 | bool hjud; |
e1b7793c ILT |
1101 | unsigned int ix; |
1102 | struct c_goto_bindings *g; | |
1103 | ||
1104 | if (TREE_CODE (b->decl) != LABEL_DECL) | |
1105 | continue; | |
1106 | label_vars = b->u.label; | |
1107 | ||
1108 | b1 = label_vars->label_bindings.bindings_in_scope; | |
744f0946 ILT |
1109 | if (label_vars->label_bindings.scope == NULL) |
1110 | hjud = false; | |
1111 | else | |
1112 | hjud = label_vars->label_bindings.scope->has_jump_unsafe_decl; | |
e1b7793c ILT |
1113 | if (update_spot_bindings (scope, &label_vars->label_bindings)) |
1114 | { | |
1115 | /* This label is defined in this scope. */ | |
744f0946 | 1116 | if (hjud) |
e1b7793c | 1117 | { |
744f0946 ILT |
1118 | for (; b1 != NULL; b1 = b1->prev) |
1119 | { | |
1120 | /* A goto from later in the function to this | |
1121 | label will never see the initialization | |
1122 | of B1, if any. Save it to issue a | |
1123 | warning if needed. */ | |
1124 | if (decl_jump_unsafe (b1->decl)) | |
9771b263 | 1125 | vec_safe_push(label_vars->decls_in_scope, b1->decl); |
744f0946 | 1126 | } |
e1b7793c ILT |
1127 | } |
1128 | } | |
1129 | ||
1130 | /* Update the bindings of any goto statements associated | |
1131 | with this label. */ | |
9771b263 | 1132 | FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g) |
e1b7793c ILT |
1133 | update_spot_bindings (scope, &g->goto_bindings); |
1134 | } | |
1135 | } | |
1136 | ||
1137 | /* Don't search beyond the current function. */ | |
1138 | if (s == current_function_scope) | |
1139 | break; | |
1140 | ||
1141 | s = s->outer; | |
1142 | } | |
1143 | } | |
1144 | ||
9affb2c7 ZW |
1145 | /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */ |
1146 | ||
1147 | static void | |
1148 | set_type_context (tree type, tree context) | |
1149 | { | |
1150 | for (type = TYPE_MAIN_VARIANT (type); type; | |
1151 | type = TYPE_NEXT_VARIANT (type)) | |
1152 | TYPE_CONTEXT (type) = context; | |
1153 | } | |
1154 | ||
f8521984 | 1155 | /* Exit a scope. Restore the state of the identifier-decl mappings |
f75fbaf7 ZW |
1156 | that were in effect when this scope was entered. Return a BLOCK |
1157 | node containing all the DECLs in this scope that are of interest | |
1158 | to debug info generation. */ | |
51e29401 RS |
1159 | |
1160 | tree | |
f75fbaf7 | 1161 | pop_scope (void) |
51e29401 | 1162 | { |
f91f41b2 | 1163 | struct c_scope *scope = current_scope; |
f75fbaf7 ZW |
1164 | tree block, context, p; |
1165 | struct c_binding *b; | |
9cd51ef6 | 1166 | |
f75fbaf7 ZW |
1167 | bool functionbody = scope->function_body; |
1168 | bool keep = functionbody || scope->keep || scope->bindings; | |
f91f41b2 | 1169 | |
e1b7793c | 1170 | update_label_decls (scope); |
187230a7 | 1171 | |
f91f41b2 ZW |
1172 | /* If appropriate, create a BLOCK to record the decls for the life |
1173 | of this function. */ | |
3fa8871b | 1174 | block = NULL_TREE; |
f91f41b2 ZW |
1175 | if (keep) |
1176 | { | |
1177 | block = make_node (BLOCK); | |
f91f41b2 ZW |
1178 | BLOCK_SUBBLOCKS (block) = scope->blocks; |
1179 | TREE_USED (block) = 1; | |
f91f41b2 | 1180 | |
f75fbaf7 | 1181 | /* In each subblock, record that this is its superior. */ |
87caf699 | 1182 | for (p = scope->blocks; p; p = BLOCK_CHAIN (p)) |
f75fbaf7 | 1183 | BLOCK_SUPERCONTEXT (p) = block; |
f91f41b2 | 1184 | |
3fa8871b | 1185 | BLOCK_VARS (block) = NULL_TREE; |
f75fbaf7 | 1186 | } |
339a28b9 | 1187 | |
f75fbaf7 ZW |
1188 | /* The TYPE_CONTEXTs for all of the tagged types belonging to this |
1189 | scope must be set so that they point to the appropriate | |
1190 | construct, i.e. either to the current FUNCTION_DECL node, or | |
1191 | else to the BLOCK node we just constructed. | |
f91f41b2 | 1192 | |
f75fbaf7 ZW |
1193 | Note that for tagged types whose scope is just the formal |
1194 | parameter list for some function type specification, we can't | |
1195 | properly set their TYPE_CONTEXTs here, because we don't have a | |
1196 | pointer to the appropriate FUNCTION_TYPE node readily available | |
1197 | to us. For those cases, the TYPE_CONTEXTs of the relevant tagged | |
1198 | type nodes get set in `grokdeclarator' as soon as we have created | |
1199 | the FUNCTION_TYPE node which will represent the "scope" for these | |
1200 | "parameter list local" tagged types. */ | |
1201 | if (scope->function_body) | |
1202 | context = current_function_decl; | |
1203 | else if (scope == file_scope) | |
eecec698 | 1204 | { |
e5e391d6 MO |
1205 | tree file_decl |
1206 | = build_translation_unit_decl (get_identifier (main_input_filename)); | |
eecec698 | 1207 | context = file_decl; |
881a5e60 | 1208 | debug_hooks->register_main_translation_unit (file_decl); |
eecec698 | 1209 | } |
f75fbaf7 ZW |
1210 | else |
1211 | context = block; | |
f91f41b2 | 1212 | |
f75fbaf7 ZW |
1213 | /* Clear all bindings in this scope. */ |
1214 | for (b = scope->bindings; b; b = free_binding_and_advance (b)) | |
339a28b9 | 1215 | { |
f75fbaf7 | 1216 | p = b->decl; |
f91f41b2 | 1217 | switch (TREE_CODE (p)) |
14e33ee8 | 1218 | { |
f91f41b2 | 1219 | case LABEL_DECL: |
f75fbaf7 | 1220 | /* Warnings for unused labels, errors for undefined labels. */ |
f91f41b2 | 1221 | if (TREE_USED (p) && !DECL_INITIAL (p)) |
14e33ee8 | 1222 | { |
dee15844 | 1223 | error ("label %q+D used but not defined", p); |
f91f41b2 | 1224 | DECL_INITIAL (p) = error_mark_node; |
14e33ee8 | 1225 | } |
b8698a0f | 1226 | else |
c616e51b MLI |
1227 | warn_for_unused_label (p); |
1228 | ||
f75fbaf7 | 1229 | /* Labels go in BLOCK_VARS. */ |
910ad8de | 1230 | DECL_CHAIN (p) = BLOCK_VARS (block); |
f75fbaf7 | 1231 | BLOCK_VARS (block) = p; |
366de0ce | 1232 | gcc_assert (I_LABEL_BINDING (b->id) == b); |
c22cacf3 | 1233 | I_LABEL_BINDING (b->id) = b->shadowed; |
e1b7793c ILT |
1234 | |
1235 | /* Also pop back to the shadowed label_vars. */ | |
1236 | release_tree_vector (b->u.label->decls_in_scope); | |
1237 | b->u.label = b->u.label->shadowed; | |
c22cacf3 | 1238 | break; |
339a28b9 | 1239 | |
f75fbaf7 ZW |
1240 | case ENUMERAL_TYPE: |
1241 | case UNION_TYPE: | |
1242 | case RECORD_TYPE: | |
9affb2c7 | 1243 | set_type_context (p, context); |
f75fbaf7 ZW |
1244 | |
1245 | /* Types may not have tag-names, in which case the type | |
1246 | appears in the bindings list with b->id NULL. */ | |
1247 | if (b->id) | |
1248 | { | |
366de0ce | 1249 | gcc_assert (I_TAG_BINDING (b->id) == b); |
f75fbaf7 ZW |
1250 | I_TAG_BINDING (b->id) = b->shadowed; |
1251 | } | |
c22cacf3 | 1252 | break; |
339a28b9 | 1253 | |
f91f41b2 | 1254 | case FUNCTION_DECL: |
f75fbaf7 ZW |
1255 | /* Propagate TREE_ADDRESSABLE from nested functions to their |
1256 | containing functions. */ | |
3f75a254 | 1257 | if (!TREE_ASM_WRITTEN (p) |
3fa8871b | 1258 | && DECL_INITIAL (p) != NULL_TREE |
f91f41b2 | 1259 | && TREE_ADDRESSABLE (p) |
3fa8871b | 1260 | && DECL_ABSTRACT_ORIGIN (p) != NULL_TREE |
f91f41b2 ZW |
1261 | && DECL_ABSTRACT_ORIGIN (p) != p) |
1262 | TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1; | |
65c5b1eb | 1263 | if (!TREE_PUBLIC (p) |
71113fcd | 1264 | && !DECL_INITIAL (p) |
65c5b1eb | 1265 | && !b->nested |
71113fcd GK |
1266 | && scope != file_scope |
1267 | && scope != external_scope) | |
73aea290 | 1268 | { |
dee15844 | 1269 | error ("nested function %q+D declared but never defined", p); |
73aea290 JM |
1270 | undef_nested_function = true; |
1271 | } | |
71113fcd GK |
1272 | else if (DECL_DECLARED_INLINE_P (p) |
1273 | && TREE_PUBLIC (p) | |
d0728ae0 JJ |
1274 | && !DECL_INITIAL (p)) |
1275 | { | |
1276 | /* C99 6.7.4p6: "a function with external linkage... declared | |
1277 | with an inline function specifier ... shall also be defined | |
1278 | in the same translation unit." */ | |
6bc8a126 | 1279 | if (!flag_gnu89_inline |
1bc5a451 | 1280 | && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (p)) |
65c5b1eb | 1281 | && scope == external_scope) |
d0728ae0 JJ |
1282 | pedwarn (input_location, 0, |
1283 | "inline function %q+D declared but never defined", p); | |
1284 | DECL_EXTERNAL (p) = 1; | |
1285 | } | |
71113fcd | 1286 | |
f75fbaf7 | 1287 | goto common_symbol; |
f91f41b2 ZW |
1288 | |
1289 | case VAR_DECL: | |
caf93cb0 | 1290 | /* Warnings for unused variables. */ |
ebfbbdc5 | 1291 | if ((!TREE_USED (p) || !DECL_READ_P (p)) |
f95f80d1 | 1292 | && !TREE_NO_WARNING (p) |
f91f41b2 ZW |
1293 | && !DECL_IN_SYSTEM_HEADER (p) |
1294 | && DECL_NAME (p) | |
f75fbaf7 | 1295 | && !DECL_ARTIFICIAL (p) |
29128154 | 1296 | && scope != file_scope |
c22cacf3 | 1297 | && scope != external_scope) |
ebfbbdc5 JJ |
1298 | { |
1299 | if (!TREE_USED (p)) | |
1300 | warning (OPT_Wunused_variable, "unused variable %q+D", p); | |
1301 | else if (DECL_CONTEXT (p) == current_function_decl) | |
1302 | warning_at (DECL_SOURCE_LOCATION (p), | |
1303 | OPT_Wunused_but_set_variable, | |
1304 | "variable %qD set but not used", p); | |
1305 | } | |
f75fbaf7 | 1306 | |
0b410f0b JM |
1307 | if (b->inner_comp) |
1308 | { | |
dee15844 JM |
1309 | error ("type of array %q+D completed incompatibly with" |
1310 | " implicit initialization", p); | |
0b410f0b JM |
1311 | } |
1312 | ||
a1105617 | 1313 | /* Fall through. */ |
f75fbaf7 ZW |
1314 | case TYPE_DECL: |
1315 | case CONST_DECL: | |
1316 | common_symbol: | |
1317 | /* All of these go in BLOCK_VARS, but only if this is the | |
1318 | binding in the home scope. */ | |
9aaabf8a | 1319 | if (!b->nested) |
f75fbaf7 | 1320 | { |
910ad8de | 1321 | DECL_CHAIN (p) = BLOCK_VARS (block); |
f75fbaf7 ZW |
1322 | BLOCK_VARS (block) = p; |
1323 | } | |
17fe0fdb | 1324 | else if (VAR_OR_FUNCTION_DECL_P (p) && scope != file_scope) |
b3f27c15 JJ |
1325 | { |
1326 | /* For block local externs add a special | |
1327 | DECL_EXTERNAL decl for debug info generation. */ | |
1328 | tree extp = copy_node (p); | |
1329 | ||
1330 | DECL_EXTERNAL (extp) = 1; | |
1331 | TREE_STATIC (extp) = 0; | |
1332 | TREE_PUBLIC (extp) = 1; | |
1333 | DECL_INITIAL (extp) = NULL_TREE; | |
1334 | DECL_LANG_SPECIFIC (extp) = NULL; | |
1335 | DECL_CONTEXT (extp) = current_function_decl; | |
1336 | if (TREE_CODE (p) == FUNCTION_DECL) | |
1337 | { | |
1338 | DECL_RESULT (extp) = NULL_TREE; | |
1339 | DECL_SAVED_TREE (extp) = NULL_TREE; | |
1340 | DECL_STRUCT_FUNCTION (extp) = NULL; | |
1341 | } | |
1342 | if (b->locus != UNKNOWN_LOCATION) | |
1343 | DECL_SOURCE_LOCATION (extp) = b->locus; | |
910ad8de | 1344 | DECL_CHAIN (extp) = BLOCK_VARS (block); |
b3f27c15 JJ |
1345 | BLOCK_VARS (block) = extp; |
1346 | } | |
116f30c3 RG |
1347 | /* If this is the file scope set DECL_CONTEXT of each decl to |
1348 | the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p | |
1349 | work. */ | |
1350 | if (scope == file_scope) | |
9affb2c7 ZW |
1351 | { |
1352 | DECL_CONTEXT (p) = context; | |
116f30c3 RG |
1353 | if (TREE_CODE (p) == TYPE_DECL |
1354 | && TREE_TYPE (p) != error_mark_node) | |
9affb2c7 ZW |
1355 | set_type_context (TREE_TYPE (p), context); |
1356 | } | |
55d54003 | 1357 | |
81fea426 | 1358 | gcc_fallthrough (); |
f75fbaf7 ZW |
1359 | /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have |
1360 | already been put there by store_parm_decls. Unused- | |
1361 | parameter warnings are handled by function.c. | |
1362 | error_mark_node obviously does not go in BLOCK_VARS and | |
1363 | does not get unused-variable warnings. */ | |
1364 | case PARM_DECL: | |
1365 | case ERROR_MARK: | |
1366 | /* It is possible for a decl not to have a name. We get | |
1367 | here with b->id NULL in this case. */ | |
1368 | if (b->id) | |
f91f41b2 | 1369 | { |
366de0ce | 1370 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); |
f75fbaf7 | 1371 | I_SYMBOL_BINDING (b->id) = b->shadowed; |
e1b7793c ILT |
1372 | if (b->shadowed && b->shadowed->u.type) |
1373 | TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type; | |
f91f41b2 ZW |
1374 | } |
1375 | break; | |
f75fbaf7 ZW |
1376 | |
1377 | default: | |
366de0ce | 1378 | gcc_unreachable (); |
f91f41b2 ZW |
1379 | } |
1380 | } | |
339a28b9 | 1381 | |
118a3a8b | 1382 | |
f75fbaf7 ZW |
1383 | /* Dispose of the block that we just made inside some higher level. */ |
1384 | if ((scope->function_body || scope == file_scope) && context) | |
339a28b9 | 1385 | { |
f75fbaf7 ZW |
1386 | DECL_INITIAL (context) = block; |
1387 | BLOCK_SUPERCONTEXT (block) = context; | |
339a28b9 | 1388 | } |
f91f41b2 | 1389 | else if (scope->outer) |
3bf40d18 | 1390 | { |
f91f41b2 ZW |
1391 | if (block) |
1392 | SCOPE_LIST_APPEND (scope->outer, blocks, block); | |
1393 | /* If we did not make a block for the scope just exited, any | |
1394 | blocks made for inner scopes must be carried forward so they | |
1395 | will later become subblocks of something else. */ | |
1396 | else if (scope->blocks) | |
1397 | SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks); | |
3bf40d18 | 1398 | } |
51e29401 | 1399 | |
f8521984 | 1400 | /* Pop the current scope, and free the structure for reuse. */ |
f75fbaf7 ZW |
1401 | current_scope = scope->outer; |
1402 | if (scope->function_body) | |
1403 | current_function_scope = scope->outer_function; | |
1404 | ||
1405 | memset (scope, 0, sizeof (struct c_scope)); | |
1406 | scope->outer = scope_freelist; | |
1407 | scope_freelist = scope; | |
51e29401 | 1408 | |
51e29401 RS |
1409 | return block; |
1410 | } | |
3bf40d18 | 1411 | |
f75fbaf7 ZW |
1412 | void |
1413 | push_file_scope (void) | |
1414 | { | |
1415 | tree decl; | |
f75fbaf7 | 1416 | |
f6bf7bb6 AP |
1417 | if (file_scope) |
1418 | return; | |
1419 | ||
f75fbaf7 ZW |
1420 | push_scope (); |
1421 | file_scope = current_scope; | |
1422 | ||
1423 | start_fname_decls (); | |
1424 | ||
910ad8de | 1425 | for (decl = visible_builtins; decl; decl = DECL_CHAIN (decl)) |
9aaabf8a | 1426 | bind (DECL_NAME (decl), decl, file_scope, |
b3f27c15 | 1427 | /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl)); |
f75fbaf7 ZW |
1428 | } |
1429 | ||
1430 | void | |
1431 | pop_file_scope (void) | |
1432 | { | |
1433 | /* In case there were missing closebraces, get us back to the global | |
1434 | binding level. */ | |
1435 | while (current_scope != file_scope) | |
1436 | pop_scope (); | |
1437 | ||
1438 | /* __FUNCTION__ is defined at file scope (""). This | |
1439 | call may not be necessary as my tests indicate it | |
1440 | still works without it. */ | |
1441 | finish_fname_decls (); | |
1442 | ||
991d6621 JM |
1443 | check_inline_statics (); |
1444 | ||
36c1b0de ZW |
1445 | /* This is the point to write out a PCH if we're doing that. |
1446 | In that case we do not want to do anything else. */ | |
f75fbaf7 | 1447 | if (pch_file) |
36c1b0de ZW |
1448 | { |
1449 | c_common_write_pch (); | |
6b5b4e9c JJ |
1450 | /* Ensure even the callers don't try to finalize the CU. */ |
1451 | flag_syntax_only = 1; | |
36c1b0de ZW |
1452 | return; |
1453 | } | |
f75fbaf7 | 1454 | |
36c1b0de | 1455 | /* Pop off the file scope and close this translation unit. */ |
f75fbaf7 ZW |
1456 | pop_scope (); |
1457 | file_scope = 0; | |
bedb9fc0 RH |
1458 | |
1459 | maybe_apply_pending_pragma_weaks (); | |
f75fbaf7 | 1460 | } |
e1b7793c ILT |
1461 | \f |
1462 | /* Adjust the bindings for the start of a statement expression. */ | |
1463 | ||
1464 | void | |
1465 | c_bindings_start_stmt_expr (struct c_spot_bindings* switch_bindings) | |
1466 | { | |
1467 | struct c_scope *scope; | |
1468 | ||
1469 | for (scope = current_scope; scope != NULL; scope = scope->outer) | |
1470 | { | |
1471 | struct c_binding *b; | |
1472 | ||
1473 | if (!scope->has_label_bindings) | |
1474 | continue; | |
1475 | ||
1476 | for (b = scope->bindings; b != NULL; b = b->prev) | |
1477 | { | |
1478 | struct c_label_vars *label_vars; | |
1479 | unsigned int ix; | |
1480 | struct c_goto_bindings *g; | |
1481 | ||
1482 | if (TREE_CODE (b->decl) != LABEL_DECL) | |
1483 | continue; | |
1484 | label_vars = b->u.label; | |
1485 | ++label_vars->label_bindings.stmt_exprs; | |
9771b263 | 1486 | FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g) |
e1b7793c ILT |
1487 | ++g->goto_bindings.stmt_exprs; |
1488 | } | |
1489 | } | |
1490 | ||
1491 | if (switch_bindings != NULL) | |
1492 | ++switch_bindings->stmt_exprs; | |
1493 | } | |
1494 | ||
1495 | /* Adjust the bindings for the end of a statement expression. */ | |
1496 | ||
1497 | void | |
1498 | c_bindings_end_stmt_expr (struct c_spot_bindings *switch_bindings) | |
1499 | { | |
1500 | struct c_scope *scope; | |
1501 | ||
1502 | for (scope = current_scope; scope != NULL; scope = scope->outer) | |
1503 | { | |
1504 | struct c_binding *b; | |
1505 | ||
1506 | if (!scope->has_label_bindings) | |
1507 | continue; | |
1508 | ||
1509 | for (b = scope->bindings; b != NULL; b = b->prev) | |
1510 | { | |
1511 | struct c_label_vars *label_vars; | |
1512 | unsigned int ix; | |
1513 | struct c_goto_bindings *g; | |
1514 | ||
1515 | if (TREE_CODE (b->decl) != LABEL_DECL) | |
1516 | continue; | |
1517 | label_vars = b->u.label; | |
1518 | --label_vars->label_bindings.stmt_exprs; | |
1519 | if (label_vars->label_bindings.stmt_exprs < 0) | |
1520 | { | |
1521 | label_vars->label_bindings.left_stmt_expr = true; | |
1522 | label_vars->label_bindings.stmt_exprs = 0; | |
1523 | } | |
9771b263 | 1524 | FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g) |
e1b7793c ILT |
1525 | { |
1526 | --g->goto_bindings.stmt_exprs; | |
1527 | if (g->goto_bindings.stmt_exprs < 0) | |
1528 | { | |
1529 | g->goto_bindings.left_stmt_expr = true; | |
1530 | g->goto_bindings.stmt_exprs = 0; | |
1531 | } | |
1532 | } | |
1533 | } | |
1534 | } | |
f75fbaf7 | 1535 | |
e1b7793c ILT |
1536 | if (switch_bindings != NULL) |
1537 | { | |
1538 | --switch_bindings->stmt_exprs; | |
1539 | gcc_assert (switch_bindings->stmt_exprs >= 0); | |
1540 | } | |
1541 | } | |
51e29401 | 1542 | \f |
51e29401 RS |
1543 | /* Push a definition or a declaration of struct, union or enum tag "name". |
1544 | "type" should be the type node. | |
c2255bc4 AH |
1545 | We assume that the tag "name" is not already defined, and has a location |
1546 | of LOC. | |
51e29401 RS |
1547 | |
1548 | Note that the definition may really be just a forward reference. | |
1549 | In that case, the TYPE_SIZE will be zero. */ | |
1550 | ||
f75fbaf7 | 1551 | static void |
c2255bc4 | 1552 | pushtag (location_t loc, tree name, tree type) |
51e29401 | 1553 | { |
14077d68 | 1554 | /* Record the identifier as the type's name if it has none. */ |
f75fbaf7 ZW |
1555 | if (name && !TYPE_NAME (type)) |
1556 | TYPE_NAME (type) = name; | |
24b97832 | 1557 | bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false, loc); |
c138f328 | 1558 | |
51e29401 | 1559 | /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the |
f8521984 | 1560 | tagged type we just added to the current scope. This fake |
51e29401 | 1561 | NULL-named TYPE_DECL node helps dwarfout.c to know when it needs |
858a47b1 | 1562 | to output a representation of a tagged type, and it also gives |
51e29401 RS |
1563 | us a convenient place to record the "scope start" address for the |
1564 | tagged type. */ | |
1565 | ||
c2255bc4 AH |
1566 | TYPE_STUB_DECL (type) = pushdecl (build_decl (loc, |
1567 | TYPE_DECL, NULL_TREE, type)); | |
88dad228 JM |
1568 | |
1569 | /* An approximation for now, so we can tell this is a function-scope tag. | |
f75fbaf7 | 1570 | This will be updated in pop_scope. */ |
88dad228 | 1571 | TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type)); |
7e5487a2 ILT |
1572 | |
1573 | if (warn_cxx_compat && name != NULL_TREE) | |
1574 | { | |
1575 | struct c_binding *b = I_SYMBOL_BINDING (name); | |
1576 | ||
1577 | if (b != NULL | |
1578 | && b->decl != NULL_TREE | |
1579 | && TREE_CODE (b->decl) == TYPE_DECL | |
1580 | && (B_IN_CURRENT_SCOPE (b) | |
1581 | || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b))) | |
1582 | && (TYPE_MAIN_VARIANT (TREE_TYPE (b->decl)) | |
1583 | != TYPE_MAIN_VARIANT (type))) | |
1584 | { | |
097f82ec | 1585 | auto_diagnostic_group d; |
bb85aa74 MP |
1586 | if (warning_at (loc, OPT_Wc___compat, |
1587 | ("using %qD as both a typedef and a tag is " | |
1588 | "invalid in C++"), b->decl) | |
1589 | && b->locus != UNKNOWN_LOCATION) | |
7e5487a2 ILT |
1590 | inform (b->locus, "originally defined here"); |
1591 | } | |
1592 | } | |
51e29401 | 1593 | } |
ddc8de03 PM |
1594 | |
1595 | /* An exported interface to pushtag. This is used by the gdb plugin's | |
1596 | binding oracle to introduce a new tag binding. */ | |
1597 | ||
1598 | void | |
1599 | c_pushtag (location_t loc, tree name, tree type) | |
1600 | { | |
1601 | pushtag (loc, name, type); | |
1602 | } | |
1603 | ||
1604 | /* An exported interface to bind a declaration. LOC is the location | |
1605 | to use. DECL is the declaration to bind. The decl's name is used | |
1606 | to determine how it is bound. If DECL is a VAR_DECL, then | |
1607 | IS_GLOBAL determines whether the decl is put into the global (file | |
1608 | and external) scope or the current function's scope; if DECL is not | |
1609 | a VAR_DECL then it is always put into the file scope. */ | |
1610 | ||
1611 | void | |
1612 | c_bind (location_t loc, tree decl, bool is_global) | |
1613 | { | |
1614 | struct c_scope *scope; | |
1615 | bool nested = false; | |
1616 | ||
0ae9bd27 | 1617 | if (!VAR_P (decl) || current_function_scope == NULL) |
ddc8de03 PM |
1618 | { |
1619 | /* Types and functions are always considered to be global. */ | |
1620 | scope = file_scope; | |
1621 | DECL_EXTERNAL (decl) = 1; | |
1622 | TREE_PUBLIC (decl) = 1; | |
1623 | } | |
1624 | else if (is_global) | |
1625 | { | |
1626 | /* Also bind it into the external scope. */ | |
1627 | bind (DECL_NAME (decl), decl, external_scope, true, false, loc); | |
1628 | nested = true; | |
1629 | scope = file_scope; | |
1630 | DECL_EXTERNAL (decl) = 1; | |
1631 | TREE_PUBLIC (decl) = 1; | |
1632 | } | |
1633 | else | |
1634 | { | |
1635 | DECL_CONTEXT (decl) = current_function_decl; | |
1636 | TREE_PUBLIC (decl) = 0; | |
1637 | scope = current_function_scope; | |
1638 | } | |
1639 | ||
1640 | bind (DECL_NAME (decl), decl, scope, false, nested, loc); | |
1641 | } | |
51e29401 | 1642 | \f |
d8b5a1a0 | 1643 | |
6a335b96 JJ |
1644 | /* Stores the first FILE*, const struct tm* etc. argument type (whatever it |
1645 | is) seen in a declaration of a file I/O etc. built-in. Subsequent | |
1646 | declarations of such built-ins are expected to refer to it rather than to | |
1647 | fileptr_type_node etc. which is just void* (or to any other type). | |
d8b5a1a0 MS |
1648 | Used only by match_builtin_function_types. */ |
1649 | ||
6a335b96 | 1650 | static GTY(()) tree last_structptr_types[6]; |
d8b5a1a0 | 1651 | |
3c6e6fbf | 1652 | /* Subroutine of compare_decls. Allow harmless mismatches in return |
d8b5a1a0 MS |
1653 | and argument types provided that the type modes match. Set *STRICT |
1654 | and *ARGNO to the expected argument type and number in case of | |
1655 | an argument type mismatch or null and zero otherwise. Return | |
1656 | a unified type given a suitable match, and 0 otherwise. */ | |
6907ddd3 RS |
1657 | |
1658 | static tree | |
d8b5a1a0 MS |
1659 | match_builtin_function_types (tree newtype, tree oldtype, |
1660 | tree *strict, unsigned *argno) | |
6907ddd3 | 1661 | { |
6907ddd3 | 1662 | /* Accept the return type of the new declaration if same modes. */ |
d8b5a1a0 MS |
1663 | tree oldrettype = TREE_TYPE (oldtype); |
1664 | tree newrettype = TREE_TYPE (newtype); | |
1665 | ||
1666 | *argno = 0; | |
1667 | *strict = NULL_TREE; | |
6907ddd3 RS |
1668 | |
1669 | if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype)) | |
6574d78e | 1670 | return NULL_TREE; |
6907ddd3 | 1671 | |
6a335b96 JJ |
1672 | if (!comptypes (TYPE_MAIN_VARIANT (oldrettype), |
1673 | TYPE_MAIN_VARIANT (newrettype))) | |
d8b5a1a0 | 1674 | *strict = oldrettype; |
6907ddd3 | 1675 | |
d8b5a1a0 MS |
1676 | tree oldargs = TYPE_ARG_TYPES (oldtype); |
1677 | tree newargs = TYPE_ARG_TYPES (newtype); | |
1678 | tree tryargs = newargs; | |
1679 | ||
6a335b96 JJ |
1680 | gcc_checking_assert ((sizeof (last_structptr_types) |
1681 | / sizeof (last_structptr_types[0])) | |
1682 | == (sizeof (builtin_structptr_types) | |
1683 | / sizeof (builtin_structptr_types[0]))); | |
d8b5a1a0 | 1684 | for (unsigned i = 1; oldargs || newargs; ++i) |
6907ddd3 | 1685 | { |
3f75a254 JM |
1686 | if (!oldargs |
1687 | || !newargs | |
1688 | || !TREE_VALUE (oldargs) | |
d8b5a1a0 | 1689 | || !TREE_VALUE (newargs)) |
6574d78e | 1690 | return NULL_TREE; |
6907ddd3 | 1691 | |
6a335b96 JJ |
1692 | tree oldtype = TYPE_MAIN_VARIANT (TREE_VALUE (oldargs)); |
1693 | tree newtype = TYPE_MAIN_VARIANT (TREE_VALUE (newargs)); | |
d8b5a1a0 MS |
1694 | |
1695 | /* Fail for types with incompatible modes/sizes. */ | |
1696 | if (TYPE_MODE (TREE_VALUE (oldargs)) | |
1697 | != TYPE_MODE (TREE_VALUE (newargs))) | |
1698 | return NULL_TREE; | |
1699 | ||
1700 | /* Fail for function and object pointer mismatches. */ | |
6a335b96 JJ |
1701 | if ((FUNCTION_POINTER_TYPE_P (oldtype) |
1702 | != FUNCTION_POINTER_TYPE_P (newtype)) | |
d8b5a1a0 MS |
1703 | || POINTER_TYPE_P (oldtype) != POINTER_TYPE_P (newtype)) |
1704 | return NULL_TREE; | |
1705 | ||
6a335b96 JJ |
1706 | unsigned j = (sizeof (builtin_structptr_types) |
1707 | / sizeof (builtin_structptr_types[0])); | |
1708 | if (POINTER_TYPE_P (oldtype)) | |
1709 | for (j = 0; j < (sizeof (builtin_structptr_types) | |
1710 | / sizeof (builtin_structptr_types[0])); ++j) | |
1711 | { | |
1712 | if (TREE_VALUE (oldargs) != builtin_structptr_types[j].node) | |
1713 | continue; | |
1714 | /* Store the first FILE* etc. argument type (whatever it is), and | |
1715 | expect any subsequent declarations of file I/O etc. built-ins | |
1716 | to refer to it rather than to fileptr_type_node etc. which is | |
1717 | just void* (or const void*). */ | |
1718 | if (last_structptr_types[j]) | |
1719 | { | |
1720 | if (!comptypes (last_structptr_types[j], newtype)) | |
1721 | { | |
1722 | *argno = i; | |
1723 | *strict = last_structptr_types[j]; | |
1724 | } | |
1725 | } | |
1726 | else | |
1727 | last_structptr_types[j] = newtype; | |
1728 | break; | |
1729 | } | |
1730 | if (j == (sizeof (builtin_structptr_types) | |
1731 | / sizeof (builtin_structptr_types[0])) | |
1732 | && !*strict | |
1733 | && !comptypes (oldtype, newtype)) | |
d8b5a1a0 MS |
1734 | { |
1735 | *argno = i; | |
1736 | *strict = oldtype; | |
1737 | } | |
1738 | ||
6907ddd3 RS |
1739 | oldargs = TREE_CHAIN (oldargs); |
1740 | newargs = TREE_CHAIN (newargs); | |
1741 | } | |
1742 | ||
d8b5a1a0 | 1743 | tree trytype = build_function_type (newrettype, tryargs); |
b8fd7909 JM |
1744 | |
1745 | /* Allow declaration to change transaction_safe attribute. */ | |
1746 | tree oldattrs = TYPE_ATTRIBUTES (oldtype); | |
1747 | tree oldtsafe = lookup_attribute ("transaction_safe", oldattrs); | |
1748 | tree newattrs = TYPE_ATTRIBUTES (newtype); | |
1749 | tree newtsafe = lookup_attribute ("transaction_safe", newattrs); | |
1750 | if (oldtsafe && !newtsafe) | |
1751 | oldattrs = remove_attribute ("transaction_safe", oldattrs); | |
1752 | else if (newtsafe && !oldtsafe) | |
1753 | oldattrs = tree_cons (get_identifier ("transaction_safe"), | |
1754 | NULL_TREE, oldattrs); | |
1755 | ||
1756 | return build_type_attribute_variant (trytype, oldattrs); | |
6907ddd3 RS |
1757 | } |
1758 | ||
1f52178b | 1759 | /* Subroutine of diagnose_mismatched_decls. Check for function type |
3c6e6fbf | 1760 | mismatch involving an empty arglist vs a nonempty one and give clearer |
9ac97460 | 1761 | diagnostics. */ |
3c6e6fbf ZW |
1762 | static void |
1763 | diagnose_arglist_conflict (tree newdecl, tree olddecl, | |
1764 | tree newtype, tree oldtype) | |
1765 | { | |
1766 | tree t; | |
51e29401 | 1767 | |
3c6e6fbf | 1768 | if (TREE_CODE (olddecl) != FUNCTION_DECL |
132da1a5 | 1769 | || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype)) |
3fa8871b MP |
1770 | || !((!prototype_p (oldtype) && DECL_INITIAL (olddecl) == NULL_TREE) |
1771 | || (!prototype_p (newtype) && DECL_INITIAL (newdecl) == NULL_TREE))) | |
3c6e6fbf | 1772 | return; |
bf44f7de | 1773 | |
3c6e6fbf | 1774 | t = TYPE_ARG_TYPES (oldtype); |
3fa8871b | 1775 | if (t == NULL_TREE) |
3c6e6fbf ZW |
1776 | t = TYPE_ARG_TYPES (newtype); |
1777 | for (; t; t = TREE_CHAIN (t)) | |
1778 | { | |
1779 | tree type = TREE_VALUE (t); | |
51e29401 | 1780 | |
3fa8871b | 1781 | if (TREE_CHAIN (t) == NULL_TREE |
3c6e6fbf ZW |
1782 | && TYPE_MAIN_VARIANT (type) != void_type_node) |
1783 | { | |
a9c697b8 MS |
1784 | inform (input_location, "a parameter list with an ellipsis " |
1785 | "cannot match an empty parameter name list declaration"); | |
3c6e6fbf ZW |
1786 | break; |
1787 | } | |
1788 | ||
1789 | if (c_type_promotes_to (type) != type) | |
1790 | { | |
a9c697b8 MS |
1791 | inform (input_location, "an argument type that has a default " |
1792 | "promotion cannot match an empty parameter name list " | |
1793 | "declaration"); | |
3c6e6fbf ZW |
1794 | break; |
1795 | } | |
1796 | } | |
1797 | } | |
51e29401 | 1798 | |
3c6e6fbf ZW |
1799 | /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an |
1800 | old-style function definition, NEWDECL is a prototype declaration. | |
1801 | Diagnose inconsistencies in the argument list. Returns TRUE if | |
1802 | the prototype is compatible, FALSE if not. */ | |
1803 | static bool | |
1804 | validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype) | |
1805 | { | |
bc298aa7 ZW |
1806 | tree newargs, oldargs; |
1807 | int i; | |
1808 | ||
2c83be0c | 1809 | #define END_OF_ARGLIST(t) ((t) == void_type_node) |
bc298aa7 ZW |
1810 | |
1811 | oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype); | |
1812 | newargs = TYPE_ARG_TYPES (newtype); | |
1813 | i = 1; | |
1814 | ||
1815 | for (;;) | |
9162542e | 1816 | { |
ffc44ab6 VR |
1817 | tree oldargtype = TREE_VALUE (oldargs); |
1818 | tree newargtype = TREE_VALUE (newargs); | |
1819 | ||
1820 | if (oldargtype == error_mark_node || newargtype == error_mark_node) | |
1821 | return false; | |
1822 | ||
267bac10 JM |
1823 | oldargtype = (TYPE_ATOMIC (oldargtype) |
1824 | ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype), | |
1825 | TYPE_QUAL_ATOMIC) | |
1826 | : TYPE_MAIN_VARIANT (oldargtype)); | |
1827 | newargtype = (TYPE_ATOMIC (newargtype) | |
1828 | ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype), | |
1829 | TYPE_QUAL_ATOMIC) | |
1830 | : TYPE_MAIN_VARIANT (newargtype)); | |
bc298aa7 ZW |
1831 | |
1832 | if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype)) | |
1833 | break; | |
1834 | ||
1835 | /* Reaching the end of just one list means the two decls don't | |
1836 | agree on the number of arguments. */ | |
1837 | if (END_OF_ARGLIST (oldargtype)) | |
9162542e | 1838 | { |
dee15844 JM |
1839 | error ("prototype for %q+D declares more arguments " |
1840 | "than previous old-style definition", newdecl); | |
bc298aa7 | 1841 | return false; |
9162542e | 1842 | } |
bc298aa7 | 1843 | else if (END_OF_ARGLIST (newargtype)) |
3c6e6fbf | 1844 | { |
dee15844 JM |
1845 | error ("prototype for %q+D declares fewer arguments " |
1846 | "than previous old-style definition", newdecl); | |
3c6e6fbf ZW |
1847 | return false; |
1848 | } | |
bc298aa7 ZW |
1849 | |
1850 | /* Type for passing arg must be consistent with that declared | |
1851 | for the arg. */ | |
3f75a254 | 1852 | else if (!comptypes (oldargtype, newargtype)) |
3c6e6fbf | 1853 | { |
dee15844 | 1854 | error ("prototype for %q+D declares argument %d" |
40b97a2e | 1855 | " with incompatible type", |
dee15844 | 1856 | newdecl, i); |
3c6e6fbf ZW |
1857 | return false; |
1858 | } | |
bc298aa7 ZW |
1859 | |
1860 | oldargs = TREE_CHAIN (oldargs); | |
1861 | newargs = TREE_CHAIN (newargs); | |
1862 | i++; | |
9162542e | 1863 | } |
bc298aa7 ZW |
1864 | |
1865 | /* If we get here, no errors were found, but do issue a warning | |
1866 | for this poor-style construct. */ | |
dee15844 JM |
1867 | warning (0, "prototype for %q+D follows non-prototype definition", |
1868 | newdecl); | |
bc298aa7 ZW |
1869 | return true; |
1870 | #undef END_OF_ARGLIST | |
3c6e6fbf | 1871 | } |
4b4e3407 | 1872 | |
3c6e6fbf ZW |
1873 | /* Subroutine of diagnose_mismatched_decls. Report the location of DECL, |
1874 | first in a pair of mismatched declarations, using the diagnostic | |
1875 | function DIAG. */ | |
1876 | static void | |
71205d17 | 1877 | locate_old_decl (tree decl) |
3c6e6fbf | 1878 | { |
3d78e008 | 1879 | if (TREE_CODE (decl) == FUNCTION_DECL && fndecl_built_in_p (decl) |
0c249d4b | 1880 | && !C_DECL_DECLARED_BUILTIN (decl)) |
3c6e6fbf ZW |
1881 | ; |
1882 | else if (DECL_INITIAL (decl)) | |
1f5b3869 | 1883 | inform (input_location, "previous definition of %q+D was here", decl); |
3c6e6fbf | 1884 | else if (C_DECL_IMPLICIT (decl)) |
1f5b3869 | 1885 | inform (input_location, "previous implicit declaration of %q+D was here", decl); |
3c6e6fbf | 1886 | else |
1f5b3869 | 1887 | inform (input_location, "previous declaration of %q+D was here", decl); |
3c6e6fbf | 1888 | } |
51e29401 | 1889 | |
3c6e6fbf ZW |
1890 | /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL. |
1891 | Returns true if the caller should proceed to merge the two, false | |
1892 | if OLDDECL should simply be discarded. As a side effect, issues | |
1893 | all necessary diagnostics for invalid or poor-style combinations. | |
1894 | If it returns true, writes the types of NEWDECL and OLDDECL to | |
1895 | *NEWTYPEP and *OLDTYPEP - these may have been adjusted from | |
1896 | TREE_TYPE (NEWDECL, OLDDECL) respectively. */ | |
1897 | ||
1898 | static bool | |
1899 | diagnose_mismatched_decls (tree newdecl, tree olddecl, | |
1900 | tree *newtypep, tree *oldtypep) | |
1901 | { | |
1902 | tree newtype, oldtype; | |
f8f5c4b3 | 1903 | bool retval = true; |
3c6e6fbf | 1904 | |
6663ee3b EC |
1905 | #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \ |
1906 | && DECL_EXTERNAL (DECL)) | |
1907 | ||
3c6e6fbf ZW |
1908 | /* If we have error_mark_node for either decl or type, just discard |
1909 | the previous decl - we're in an error cascade already. */ | |
1910 | if (olddecl == error_mark_node || newdecl == error_mark_node) | |
1911 | return false; | |
bc298aa7 ZW |
1912 | *oldtypep = oldtype = TREE_TYPE (olddecl); |
1913 | *newtypep = newtype = TREE_TYPE (newdecl); | |
3c6e6fbf ZW |
1914 | if (oldtype == error_mark_node || newtype == error_mark_node) |
1915 | return false; | |
1916 | ||
1917 | /* Two different categories of symbol altogether. This is an error | |
1918 | unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */ | |
51e29401 RS |
1919 | if (TREE_CODE (olddecl) != TREE_CODE (newdecl)) |
1920 | { | |
f75fbaf7 | 1921 | if (!(TREE_CODE (olddecl) == FUNCTION_DECL |
3d78e008 | 1922 | && fndecl_built_in_p (olddecl) |
f75fbaf7 | 1923 | && !C_DECL_DECLARED_BUILTIN (olddecl))) |
51e29401 | 1924 | { |
097f82ec | 1925 | auto_diagnostic_group d; |
dee15844 | 1926 | error ("%q+D redeclared as different kind of symbol", newdecl); |
71205d17 | 1927 | locate_old_decl (olddecl); |
3c6e6fbf ZW |
1928 | } |
1929 | else if (TREE_PUBLIC (newdecl)) | |
ff1ff960 PC |
1930 | warning (OPT_Wbuiltin_declaration_mismatch, |
1931 | "built-in function %q+D declared as non-function", | |
dee15844 | 1932 | newdecl); |
44c21c7f | 1933 | else |
dee15844 JM |
1934 | warning (OPT_Wshadow, "declaration of %q+D shadows " |
1935 | "a built-in function", newdecl); | |
3c6e6fbf ZW |
1936 | return false; |
1937 | } | |
1938 | ||
085e33aa JM |
1939 | /* Enumerators have no linkage, so may only be declared once in a |
1940 | given scope. */ | |
1941 | if (TREE_CODE (olddecl) == CONST_DECL) | |
1942 | { | |
097f82ec | 1943 | auto_diagnostic_group d; |
dee15844 | 1944 | error ("redeclaration of enumerator %q+D", newdecl); |
71205d17 | 1945 | locate_old_decl (olddecl); |
085e33aa JM |
1946 | return false; |
1947 | } | |
1948 | ||
097f82ec DM |
1949 | bool pedwarned = false; |
1950 | bool warned = false; | |
1951 | auto_diagnostic_group d; | |
1952 | ||
132da1a5 | 1953 | if (!comptypes (oldtype, newtype)) |
3c6e6fbf | 1954 | { |
a6f78652 | 1955 | if (TREE_CODE (olddecl) == FUNCTION_DECL |
3d78e008 | 1956 | && fndecl_built_in_p (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl)) |
3c6e6fbf | 1957 | { |
d8b5a1a0 MS |
1958 | /* Accept "harmless" mismatches in function types such |
1959 | as missing qualifiers or pointer vs same size integer | |
1960 | mismatches. This is for the ffs and fprintf builtins. | |
1961 | However, with -Wextra in effect, diagnose return and | |
1962 | argument types that are incompatible according to | |
1963 | language rules. */ | |
1964 | tree mismatch_expect; | |
1965 | unsigned mismatch_argno; | |
1966 | ||
1967 | tree trytype = match_builtin_function_types (newtype, oldtype, | |
1968 | &mismatch_expect, | |
1969 | &mismatch_argno); | |
3c6e6fbf | 1970 | |
132da1a5 | 1971 | if (trytype && comptypes (newtype, trytype)) |
bc298aa7 | 1972 | *oldtypep = oldtype = trytype; |
3c6e6fbf | 1973 | else |
51e29401 | 1974 | { |
d8b5a1a0 MS |
1975 | /* If types don't match for a built-in, throw away the |
1976 | built-in. No point in calling locate_old_decl here, it | |
1977 | won't print anything. */ | |
cd5da983 MS |
1978 | const char *header |
1979 | = header_for_builtin_fn (DECL_FUNCTION_CODE (olddecl)); | |
1980 | location_t loc = DECL_SOURCE_LOCATION (newdecl); | |
1981 | if (warning_at (loc, OPT_Wbuiltin_declaration_mismatch, | |
1982 | "conflicting types for built-in function %q+D; " | |
1983 | "expected %qT", | |
1984 | newdecl, oldtype) | |
1985 | && header) | |
1986 | { | |
1987 | /* Suggest the right header to include as the preferred | |
1988 | solution rather than the spelling of the declaration. */ | |
1989 | rich_location richloc (line_table, loc); | |
1990 | maybe_add_include_fixit (&richloc, header, true); | |
1991 | inform (&richloc, | |
1992 | "%qD is declared in header %qs", olddecl, header); | |
1993 | } | |
3c6e6fbf | 1994 | return false; |
51e29401 | 1995 | } |
d8b5a1a0 MS |
1996 | |
1997 | if (mismatch_expect && extra_warnings) | |
1998 | { | |
1999 | /* If types match only loosely, print a warning but accept | |
2000 | the redeclaration. */ | |
2001 | location_t newloc = DECL_SOURCE_LOCATION (newdecl); | |
2002 | if (mismatch_argno) | |
2003 | warning_at (newloc, OPT_Wbuiltin_declaration_mismatch, | |
2004 | "mismatch in argument %u type of built-in " | |
2005 | "function %qD; expected %qT", | |
2006 | mismatch_argno, newdecl, mismatch_expect); | |
2007 | else | |
2008 | warning_at (newloc, OPT_Wbuiltin_declaration_mismatch, | |
2009 | "mismatch in return type of built-in " | |
2010 | "function %qD; expected %qT", | |
2011 | newdecl, mismatch_expect); | |
2012 | } | |
3c6e6fbf ZW |
2013 | } |
2014 | else if (TREE_CODE (olddecl) == FUNCTION_DECL | |
3c20847b | 2015 | && DECL_IS_BUILTIN (olddecl)) |
3c6e6fbf ZW |
2016 | { |
2017 | /* A conflicting function declaration for a predeclared | |
2018 | function that isn't actually built in. Objective C uses | |
2019 | these. The new declaration silently overrides everything | |
2020 | but the volatility (i.e. noreturn) indication. See also | |
2021 | below. FIXME: Make Objective C use normal builtins. */ | |
2022 | TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl); | |
2023 | return false; | |
2024 | } | |
2025 | /* Permit void foo (...) to match int foo (...) if the latter is | |
2026 | the definition and implicit int was used. See | |
2027 | c-torture/compile/920625-2.c. */ | |
2028 | else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) | |
2029 | && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node | |
2030 | && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node | |
12869142 | 2031 | && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl)) |
3c6e6fbf | 2032 | { |
509c9d60 MLI |
2033 | pedwarned = pedwarn (input_location, 0, |
2034 | "conflicting types for %q+D", newdecl); | |
3c6e6fbf | 2035 | /* Make sure we keep void as the return type. */ |
bc298aa7 | 2036 | TREE_TYPE (newdecl) = *newtypep = newtype = oldtype; |
3c6e6fbf | 2037 | C_FUNCTION_IMPLICIT_INT (newdecl) = 0; |
51e29401 | 2038 | } |
12869142 DJ |
2039 | /* Permit void foo (...) to match an earlier call to foo (...) with |
2040 | no declared type (thus, implicitly int). */ | |
2041 | else if (TREE_CODE (newdecl) == FUNCTION_DECL | |
2042 | && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node | |
2043 | && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node | |
2044 | && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl)) | |
2045 | { | |
509c9d60 MLI |
2046 | pedwarned = pedwarn (input_location, 0, |
2047 | "conflicting types for %q+D", newdecl); | |
12869142 DJ |
2048 | /* Make sure we keep void as the return type. */ |
2049 | TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype; | |
12869142 | 2050 | } |
51e29401 RS |
2051 | else |
2052 | { | |
36c5e70a BE |
2053 | int new_quals = TYPE_QUALS (newtype); |
2054 | int old_quals = TYPE_QUALS (oldtype); | |
2055 | ||
2056 | if (new_quals != old_quals) | |
2057 | { | |
2058 | addr_space_t new_addr = DECODE_QUAL_ADDR_SPACE (new_quals); | |
2059 | addr_space_t old_addr = DECODE_QUAL_ADDR_SPACE (old_quals); | |
2060 | if (new_addr != old_addr) | |
2061 | { | |
2062 | if (ADDR_SPACE_GENERIC_P (new_addr)) | |
2063 | error ("conflicting named address spaces (generic vs %s) " | |
2064 | "for %q+D", | |
2065 | c_addr_space_name (old_addr), newdecl); | |
2066 | else if (ADDR_SPACE_GENERIC_P (old_addr)) | |
2067 | error ("conflicting named address spaces (%s vs generic) " | |
2068 | "for %q+D", | |
2069 | c_addr_space_name (new_addr), newdecl); | |
2070 | else | |
2071 | error ("conflicting named address spaces (%s vs %s) " | |
2072 | "for %q+D", | |
2073 | c_addr_space_name (new_addr), | |
2074 | c_addr_space_name (old_addr), | |
2075 | newdecl); | |
2076 | } | |
2077 | ||
2078 | if (CLEAR_QUAL_ADDR_SPACE (new_quals) | |
2079 | != CLEAR_QUAL_ADDR_SPACE (old_quals)) | |
2080 | error ("conflicting type qualifiers for %q+D", newdecl); | |
2081 | } | |
118a3a8b | 2082 | else |
dee15844 | 2083 | error ("conflicting types for %q+D", newdecl); |
3c6e6fbf | 2084 | diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype); |
71205d17 | 2085 | locate_old_decl (olddecl); |
3c6e6fbf | 2086 | return false; |
51e29401 | 2087 | } |
51e29401 RS |
2088 | } |
2089 | ||
3c6e6fbf ZW |
2090 | /* Redeclaration of a type is a constraint violation (6.7.2.3p1), |
2091 | but silently ignore the redeclaration if either is in a system | |
dc5027f4 | 2092 | header. (Conflicting redeclarations were handled above.) This |
48b0b196 | 2093 | is allowed for C11 if the types are the same, not just |
dc5027f4 | 2094 | compatible. */ |
3c6e6fbf | 2095 | if (TREE_CODE (newdecl) == TYPE_DECL) |
339a28b9 | 2096 | { |
dc5027f4 JM |
2097 | bool types_different = false; |
2098 | int comptypes_result; | |
2099 | ||
2100 | comptypes_result | |
2101 | = comptypes_check_different_types (oldtype, newtype, &types_different); | |
2102 | ||
2103 | if (comptypes_result != 1 || types_different) | |
2104 | { | |
2105 | error ("redefinition of typedef %q+D with different type", newdecl); | |
2106 | locate_old_decl (olddecl); | |
2107 | return false; | |
2108 | } | |
2109 | ||
df0ed6c5 RAE |
2110 | if (DECL_IN_SYSTEM_HEADER (newdecl) |
2111 | || DECL_IN_SYSTEM_HEADER (olddecl) | |
2112 | || TREE_NO_WARNING (newdecl) | |
2113 | || TREE_NO_WARNING (olddecl)) | |
a1105617 | 2114 | return true; /* Allow OLDDECL to continue in use. */ |
118a3a8b | 2115 | |
8bf872f9 | 2116 | if (variably_modified_type_p (newtype, NULL)) |
dc5027f4 | 2117 | { |
8bf872f9 JM |
2118 | error ("redefinition of typedef %q+D with variably modified type", |
2119 | newdecl); | |
dc5027f4 JM |
2120 | locate_old_decl (olddecl); |
2121 | } | |
35aff4fb MP |
2122 | else if (pedwarn_c99 (input_location, OPT_Wpedantic, |
2123 | "redefinition of typedef %q+D", newdecl)) | |
2124 | locate_old_decl (olddecl); | |
dc5027f4 JM |
2125 | |
2126 | return true; | |
339a28b9 | 2127 | } |
51e29401 | 2128 | |
3c6e6fbf ZW |
2129 | /* Function declarations can either be 'static' or 'extern' (no |
2130 | qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore | |
71113fcd GK |
2131 | can never conflict with each other on account of linkage |
2132 | (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but | |
2133 | gnu89 mode permits two definitions if one is 'extern inline' and | |
2134 | one is not. The non- extern-inline definition supersedes the | |
2135 | extern-inline definition. */ | |
6663ee3b | 2136 | |
3c6e6fbf | 2137 | else if (TREE_CODE (newdecl) == FUNCTION_DECL) |
51e29401 | 2138 | { |
04b8f97f ZW |
2139 | /* If you declare a built-in function name as static, or |
2140 | define the built-in with an old-style definition (so we | |
2141 | can't validate the argument list) the built-in definition is | |
2142 | overridden, but optionally warn this was a bad choice of name. */ | |
3d78e008 | 2143 | if (fndecl_built_in_p (olddecl) |
cd5da983 | 2144 | && !C_DECL_DECLARED_BUILTIN (olddecl)) |
51e29401 | 2145 | { |
cd5da983 MS |
2146 | if (!TREE_PUBLIC (newdecl) |
2147 | || (DECL_INITIAL (newdecl) | |
2148 | && !prototype_p (TREE_TYPE (newdecl)))) | |
2149 | { | |
2150 | warning_at (DECL_SOURCE_LOCATION (newdecl), | |
2151 | OPT_Wshadow, "declaration of %qD shadows " | |
2152 | "a built-in function", newdecl); | |
2153 | /* Discard the old built-in function. */ | |
2154 | return false; | |
2155 | } | |
2156 | ||
2157 | if (!prototype_p (TREE_TYPE (newdecl))) | |
2158 | { | |
2159 | /* Set for built-ins that take no arguments. */ | |
2160 | bool func_void_args = false; | |
2161 | if (tree at = TYPE_ARG_TYPES (oldtype)) | |
2162 | func_void_args = VOID_TYPE_P (TREE_VALUE (at)); | |
2163 | ||
2164 | if (extra_warnings && !func_void_args) | |
2165 | warning_at (DECL_SOURCE_LOCATION (newdecl), | |
2166 | OPT_Wbuiltin_declaration_mismatch, | |
2167 | "declaration of built-in function %qD without " | |
2168 | "a prototype; expected %qT", | |
2169 | newdecl, TREE_TYPE (olddecl)); | |
2170 | } | |
51e29401 | 2171 | } |
118a3a8b | 2172 | |
3c6e6fbf | 2173 | if (DECL_INITIAL (newdecl)) |
4c41bbfa | 2174 | { |
f8f5c4b3 | 2175 | if (DECL_INITIAL (olddecl)) |
6907ddd3 | 2176 | { |
6663ee3b | 2177 | /* If both decls are in the same TU and the new declaration |
619519c8 | 2178 | isn't overriding an extern inline reject the new decl. |
71113fcd GK |
2179 | In c99, no overriding is allowed in the same translation |
2180 | unit. */ | |
2181 | if ((!DECL_EXTERN_INLINE (olddecl) | |
2182 | || DECL_EXTERN_INLINE (newdecl) | |
da1c7394 | 2183 | || (!flag_gnu89_inline |
4eb7fd83 JJ |
2184 | && (!DECL_DECLARED_INLINE_P (olddecl) |
2185 | || !lookup_attribute ("gnu_inline", | |
2186 | DECL_ATTRIBUTES (olddecl))) | |
2187 | && (!DECL_DECLARED_INLINE_P (newdecl) | |
2188 | || !lookup_attribute ("gnu_inline", | |
2189 | DECL_ATTRIBUTES (newdecl)))) | |
4eb7fd83 | 2190 | ) |
f8f5c4b3 AP |
2191 | && same_translation_unit_p (newdecl, olddecl)) |
2192 | { | |
097f82ec | 2193 | auto_diagnostic_group d; |
dee15844 | 2194 | error ("redefinition of %q+D", newdecl); |
71205d17 | 2195 | locate_old_decl (olddecl); |
f8f5c4b3 AP |
2196 | return false; |
2197 | } | |
6663ee3b | 2198 | } |
4c41bbfa | 2199 | } |
3c6e6fbf ZW |
2200 | /* If we have a prototype after an old-style function definition, |
2201 | the argument types must be checked specially. */ | |
2202 | else if (DECL_INITIAL (olddecl) | |
f4da8dce | 2203 | && !prototype_p (oldtype) && prototype_p (newtype) |
097f82ec | 2204 | && TYPE_ACTUAL_ARG_TYPES (oldtype)) |
52b6a22f | 2205 | { |
097f82ec DM |
2206 | auto_diagnostic_group d; |
2207 | if (!validate_proto_after_old_defn (newdecl, newtype, oldtype)) | |
2208 | { | |
2209 | locate_old_decl (olddecl); | |
2210 | return false; | |
2211 | } | |
52b6a22f | 2212 | } |
9aaabf8a ZW |
2213 | /* A non-static declaration (even an "extern") followed by a |
2214 | static declaration is undefined behavior per C99 6.2.2p3-5,7. | |
2215 | The same is true for a static forward declaration at block | |
2216 | scope followed by a non-static declaration/definition at file | |
2217 | scope. Static followed by non-static at the same scope is | |
2218 | not undefined behavior, and is the most convenient way to get | |
2219 | some effects (see e.g. what unwind-dw2-fde-glibc.c does to | |
2220 | the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but | |
8c27b7d4 | 2221 | we do diagnose it if -Wtraditional. */ |
3c6e6fbf | 2222 | if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl)) |
51e29401 | 2223 | { |
9aaabf8a ZW |
2224 | /* Two exceptions to the rule. If olddecl is an extern |
2225 | inline, or a predeclared function that isn't actually | |
2226 | built in, newdecl silently overrides olddecl. The latter | |
2227 | occur only in Objective C; see also above. (FIXME: Make | |
2228 | Objective C use normal builtins.) */ | |
2229 | if (!DECL_IS_BUILTIN (olddecl) | |
6663ee3b | 2230 | && !DECL_EXTERN_INLINE (olddecl)) |
3c6e6fbf | 2231 | { |
097f82ec | 2232 | auto_diagnostic_group d; |
dee15844 JM |
2233 | error ("static declaration of %q+D follows " |
2234 | "non-static declaration", newdecl); | |
71205d17 | 2235 | locate_old_decl (olddecl); |
3c6e6fbf | 2236 | } |
9aaabf8a | 2237 | return false; |
51e29401 | 2238 | } |
9aaabf8a | 2239 | else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl)) |
e841f997 | 2240 | { |
9aaabf8a ZW |
2241 | if (DECL_CONTEXT (olddecl)) |
2242 | { | |
097f82ec | 2243 | auto_diagnostic_group d; |
dee15844 JM |
2244 | error ("non-static declaration of %q+D follows " |
2245 | "static declaration", newdecl); | |
71205d17 | 2246 | locate_old_decl (olddecl); |
9aaabf8a ZW |
2247 | return false; |
2248 | } | |
2249 | else if (warn_traditional) | |
2250 | { | |
b8698a0f | 2251 | warned |= warning (OPT_Wtraditional, |
71205d17 MLI |
2252 | "non-static declaration of %q+D " |
2253 | "follows static declaration", newdecl); | |
9aaabf8a | 2254 | } |
e841f997 | 2255 | } |
4eb7fd83 JJ |
2256 | |
2257 | /* Make sure gnu_inline attribute is either not present, or | |
2258 | present on all inline decls. */ | |
2259 | if (DECL_DECLARED_INLINE_P (olddecl) | |
2260 | && DECL_DECLARED_INLINE_P (newdecl)) | |
2261 | { | |
2262 | bool newa = lookup_attribute ("gnu_inline", | |
2263 | DECL_ATTRIBUTES (newdecl)) != NULL; | |
2264 | bool olda = lookup_attribute ("gnu_inline", | |
2265 | DECL_ATTRIBUTES (olddecl)) != NULL; | |
2266 | if (newa != olda) | |
2267 | { | |
097f82ec | 2268 | auto_diagnostic_group d; |
c5d75364 MLI |
2269 | error_at (input_location, "%<gnu_inline%> attribute present on %q+D", |
2270 | newa ? newdecl : olddecl); | |
2271 | error_at (DECL_SOURCE_LOCATION (newa ? olddecl : newdecl), | |
2272 | "but not here"); | |
4eb7fd83 JJ |
2273 | } |
2274 | } | |
51e29401 | 2275 | } |
0ae9bd27 | 2276 | else if (VAR_P (newdecl)) |
339a28b9 | 2277 | { |
3c6e6fbf ZW |
2278 | /* Only variables can be thread-local, and all declarations must |
2279 | agree on this property. */ | |
953ff289 DN |
2280 | if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl)) |
2281 | { | |
2282 | /* Nothing to check. Since OLDDECL is marked threadprivate | |
2283 | and NEWDECL does not have a thread-local attribute, we | |
2284 | will merge the threadprivate attribute into NEWDECL. */ | |
2285 | ; | |
2286 | } | |
2287 | else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)) | |
51e29401 | 2288 | { |
097f82ec | 2289 | auto_diagnostic_group d; |
c2f7fa15 | 2290 | if (DECL_THREAD_LOCAL_P (newdecl)) |
dee15844 JM |
2291 | error ("thread-local declaration of %q+D follows " |
2292 | "non-thread-local declaration", newdecl); | |
3c6e6fbf | 2293 | else |
dee15844 JM |
2294 | error ("non-thread-local declaration of %q+D follows " |
2295 | "thread-local declaration", newdecl); | |
51e29401 | 2296 | |
71205d17 | 2297 | locate_old_decl (olddecl); |
3c6e6fbf ZW |
2298 | return false; |
2299 | } | |
51e29401 | 2300 | |
3c6e6fbf ZW |
2301 | /* Multiple initialized definitions are not allowed (6.9p3,5). */ |
2302 | if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl)) | |
2303 | { | |
097f82ec | 2304 | auto_diagnostic_group d; |
dee15844 | 2305 | error ("redefinition of %q+D", newdecl); |
71205d17 | 2306 | locate_old_decl (olddecl); |
3c6e6fbf ZW |
2307 | return false; |
2308 | } | |
2309 | ||
9aaabf8a ZW |
2310 | /* Objects declared at file scope: if the first declaration had |
2311 | external linkage (even if it was an external reference) the | |
2312 | second must have external linkage as well, or the behavior is | |
2313 | undefined. If the first declaration had internal linkage, then | |
2314 | the second must too, or else be an external reference (in which | |
2315 | case the composite declaration still has internal linkage). | |
2316 | As for function declarations, we warn about the static-then- | |
2317 | extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */ | |
2318 | if (DECL_FILE_SCOPE_P (newdecl) | |
2319 | && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl)) | |
3c6e6fbf | 2320 | { |
9aaabf8a ZW |
2321 | if (DECL_EXTERNAL (newdecl)) |
2322 | { | |
558d1f81 JM |
2323 | if (!DECL_FILE_SCOPE_P (olddecl)) |
2324 | { | |
097f82ec | 2325 | auto_diagnostic_group d; |
dee15844 JM |
2326 | error ("extern declaration of %q+D follows " |
2327 | "declaration with no linkage", newdecl); | |
71205d17 | 2328 | locate_old_decl (olddecl); |
558d1f81 JM |
2329 | return false; |
2330 | } | |
2331 | else if (warn_traditional) | |
9aaabf8a | 2332 | { |
b8698a0f | 2333 | warned |= warning (OPT_Wtraditional, |
71205d17 MLI |
2334 | "non-static declaration of %q+D " |
2335 | "follows static declaration", newdecl); | |
9aaabf8a ZW |
2336 | } |
2337 | } | |
2338 | else | |
3c6e6fbf | 2339 | { |
097f82ec | 2340 | auto_diagnostic_group d; |
3c6e6fbf | 2341 | if (TREE_PUBLIC (newdecl)) |
dee15844 JM |
2342 | error ("non-static declaration of %q+D follows " |
2343 | "static declaration", newdecl); | |
3c6e6fbf | 2344 | else |
dee15844 JM |
2345 | error ("static declaration of %q+D follows " |
2346 | "non-static declaration", newdecl); | |
3c6e6fbf | 2347 | |
71205d17 | 2348 | locate_old_decl (olddecl); |
3c6e6fbf | 2349 | return false; |
51e29401 RS |
2350 | } |
2351 | } | |
3c6e6fbf ZW |
2352 | /* Two objects with the same name declared at the same block |
2353 | scope must both be external references (6.7p3). */ | |
558d1f81 | 2354 | else if (!DECL_FILE_SCOPE_P (newdecl)) |
3c6e6fbf ZW |
2355 | { |
2356 | if (DECL_EXTERNAL (newdecl)) | |
0b410f0b JM |
2357 | { |
2358 | /* Extern with initializer at block scope, which will | |
2359 | already have received an error. */ | |
2360 | } | |
3c6e6fbf | 2361 | else if (DECL_EXTERNAL (olddecl)) |
0b410f0b | 2362 | { |
097f82ec | 2363 | auto_diagnostic_group d; |
dee15844 JM |
2364 | error ("declaration of %q+D with no linkage follows " |
2365 | "extern declaration", newdecl); | |
71205d17 | 2366 | locate_old_decl (olddecl); |
0b410f0b | 2367 | } |
3c6e6fbf | 2368 | else |
0b410f0b | 2369 | { |
097f82ec | 2370 | auto_diagnostic_group d; |
dee15844 | 2371 | error ("redeclaration of %q+D with no linkage", newdecl); |
71205d17 | 2372 | locate_old_decl (olddecl); |
0b410f0b | 2373 | } |
ecf92f82 | 2374 | |
3c6e6fbf ZW |
2375 | return false; |
2376 | } | |
7a5d2eb8 ILT |
2377 | |
2378 | /* C++ does not permit a decl to appear multiple times at file | |
2379 | scope. */ | |
2380 | if (warn_cxx_compat | |
2381 | && DECL_FILE_SCOPE_P (newdecl) | |
2382 | && !DECL_EXTERNAL (newdecl) | |
2383 | && !DECL_EXTERNAL (olddecl)) | |
2384 | warned |= warning_at (DECL_SOURCE_LOCATION (newdecl), | |
2385 | OPT_Wc___compat, | |
2386 | ("duplicate declaration of %qD is " | |
2387 | "invalid in C++"), | |
2388 | newdecl); | |
1ae0ccb6 | 2389 | } |
3c6e6fbf ZW |
2390 | |
2391 | /* warnings */ | |
d7afec4b | 2392 | /* All decls must agree on a visibility. */ |
c22cacf3 | 2393 | if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS) |
820cc88f | 2394 | && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl) |
3c6e6fbf | 2395 | && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl)) |
1ae0ccb6 | 2396 | { |
71205d17 MLI |
2397 | warned |= warning (0, "redeclaration of %q+D with different visibility " |
2398 | "(old visibility preserved)", newdecl); | |
1ae0ccb6 | 2399 | } |
3c6e6fbf ZW |
2400 | |
2401 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
5c3a10fb | 2402 | warned |= diagnose_mismatched_attributes (olddecl, newdecl); |
3205a71e | 2403 | else /* PARM_DECL, VAR_DECL */ |
3c6e6fbf | 2404 | { |
f75fbaf7 ZW |
2405 | /* Redeclaration of a parameter is a constraint violation (this is |
2406 | not explicitly stated, but follows from C99 6.7p3 [no more than | |
2407 | one declaration of the same identifier with no linkage in the | |
2408 | same scope, except type tags] and 6.2.2p6 [parameters have no | |
2409 | linkage]). We must check for a forward parameter declaration, | |
2410 | indicated by TREE_ASM_WRITTEN on the old declaration - this is | |
2411 | an extension, the mandatory diagnostic for which is handled by | |
2412 | mark_forward_parm_decls. */ | |
2413 | ||
3205a71e ZW |
2414 | if (TREE_CODE (newdecl) == PARM_DECL |
2415 | && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl))) | |
2416 | { | |
097f82ec | 2417 | auto_diagnostic_group d; |
dee15844 | 2418 | error ("redefinition of parameter %q+D", newdecl); |
71205d17 | 2419 | locate_old_decl (olddecl); |
3205a71e ZW |
2420 | return false; |
2421 | } | |
51e29401 RS |
2422 | } |
2423 | ||
3c6e6fbf ZW |
2424 | /* Optional warning for completely redundant decls. */ |
2425 | if (!warned && !pedwarned | |
2426 | && warn_redundant_decls | |
2427 | /* Don't warn about a function declaration followed by a | |
2428 | definition. */ | |
3205a71e ZW |
2429 | && !(TREE_CODE (newdecl) == FUNCTION_DECL |
2430 | && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)) | |
8c27b7d4 | 2431 | /* Don't warn about redundant redeclarations of builtins. */ |
c5e36c09 | 2432 | && !(TREE_CODE (newdecl) == FUNCTION_DECL |
3d78e008 ML |
2433 | && !fndecl_built_in_p (newdecl) |
2434 | && fndecl_built_in_p (olddecl) | |
c5e36c09 | 2435 | && !C_DECL_DECLARED_BUILTIN (olddecl)) |
3205a71e ZW |
2436 | /* Don't warn about an extern followed by a definition. */ |
2437 | && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl)) | |
2438 | /* Don't warn about forward parameter decls. */ | |
2439 | && !(TREE_CODE (newdecl) == PARM_DECL | |
52d09157 CR |
2440 | && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)) |
2441 | /* Don't warn about a variable definition following a declaration. */ | |
0ae9bd27 | 2442 | && !(VAR_P (newdecl) |
52d09157 | 2443 | && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))) |
27f427f8 | 2444 | { |
71205d17 MLI |
2445 | warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D", |
2446 | newdecl); | |
27f427f8 RS |
2447 | } |
2448 | ||
71205d17 | 2449 | /* Report location of previous decl/defn. */ |
3c6e6fbf | 2450 | if (warned || pedwarned) |
71205d17 | 2451 | locate_old_decl (olddecl); |
664b4b1e | 2452 | |
6663ee3b EC |
2453 | #undef DECL_EXTERN_INLINE |
2454 | ||
f8f5c4b3 | 2455 | return retval; |
3c6e6fbf | 2456 | } |
51e29401 | 2457 | |
3c6e6fbf ZW |
2458 | /* Subroutine of duplicate_decls. NEWDECL has been found to be |
2459 | consistent with OLDDECL, but carries new information. Merge the | |
1ef82ef2 | 2460 | new information into OLDDECL. This function issues no |
3c6e6fbf ZW |
2461 | diagnostics. */ |
2462 | ||
2463 | static void | |
1ef82ef2 | 2464 | merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype) |
3c6e6fbf | 2465 | { |
71113fcd | 2466 | bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL |
3fa8871b | 2467 | && DECL_INITIAL (newdecl) != NULL_TREE); |
71113fcd | 2468 | bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL |
f4da8dce | 2469 | && prototype_p (TREE_TYPE (newdecl))); |
71113fcd | 2470 | bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL |
f4da8dce | 2471 | && prototype_p (TREE_TYPE (olddecl))); |
3c6e6fbf | 2472 | |
f75fbaf7 ZW |
2473 | /* For real parm decl following a forward decl, rechain the old decl |
2474 | in its new location and clear TREE_ASM_WRITTEN (it's not a | |
2475 | forward decl anymore). */ | |
3c6e6fbf | 2476 | if (TREE_CODE (newdecl) == PARM_DECL |
3f75a254 | 2477 | && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)) |
51e29401 | 2478 | { |
f75fbaf7 ZW |
2479 | struct c_binding *b, **here; |
2480 | ||
2481 | for (here = ¤t_scope->bindings; *here; here = &(*here)->prev) | |
2482 | if ((*here)->decl == olddecl) | |
2483 | goto found; | |
366de0ce | 2484 | gcc_unreachable (); |
f75fbaf7 ZW |
2485 | |
2486 | found: | |
2487 | b = *here; | |
2488 | *here = b->prev; | |
2489 | b->prev = current_scope->bindings; | |
2490 | current_scope->bindings = b; | |
2491 | ||
3c6e6fbf | 2492 | TREE_ASM_WRITTEN (olddecl) = 0; |
3c6e6fbf ZW |
2493 | } |
2494 | ||
2495 | DECL_ATTRIBUTES (newdecl) | |
5fd9b178 | 2496 | = targetm.merge_decl_attributes (olddecl, newdecl); |
bf44f7de | 2497 | |
5fde6a45 MP |
2498 | /* For typedefs use the old type, as the new type's DECL_NAME points |
2499 | at newdecl, which will be ggc_freed. */ | |
2500 | if (TREE_CODE (newdecl) == TYPE_DECL) | |
2501 | { | |
2502 | /* But NEWTYPE might have an attribute, honor that. */ | |
2503 | tree tem = newtype; | |
2504 | newtype = oldtype; | |
2505 | ||
2506 | if (TYPE_USER_ALIGN (tem)) | |
2507 | { | |
2508 | if (TYPE_ALIGN (tem) > TYPE_ALIGN (newtype)) | |
fe37c7af | 2509 | SET_TYPE_ALIGN (newtype, TYPE_ALIGN (tem)); |
5fde6a45 MP |
2510 | TYPE_USER_ALIGN (newtype) = true; |
2511 | } | |
2512 | ||
2513 | /* And remove the new type from the variants list. */ | |
2514 | if (TYPE_NAME (TREE_TYPE (newdecl)) == newdecl) | |
2515 | { | |
2516 | tree remove = TREE_TYPE (newdecl); | |
60a2c645 | 2517 | if (TYPE_MAIN_VARIANT (remove) == remove) |
e7178413 JJ |
2518 | { |
2519 | gcc_assert (TYPE_NEXT_VARIANT (remove) == NULL_TREE); | |
2520 | /* If remove is the main variant, no need to remove that | |
2521 | from the list. One of the DECL_ORIGINAL_TYPE | |
2522 | variants, e.g. created for aligned attribute, might still | |
2523 | refer to the newdecl TYPE_DECL though, so remove that one | |
2524 | in that case. */ | |
2525 | if (DECL_ORIGINAL_TYPE (newdecl) | |
2526 | && DECL_ORIGINAL_TYPE (newdecl) != remove) | |
2527 | for (tree t = TYPE_MAIN_VARIANT (DECL_ORIGINAL_TYPE (newdecl)); | |
2528 | t; t = TYPE_MAIN_VARIANT (t)) | |
2529 | if (TYPE_NAME (TYPE_NEXT_VARIANT (t)) == newdecl) | |
2530 | { | |
2531 | TYPE_NEXT_VARIANT (t) | |
2532 | = TYPE_NEXT_VARIANT (TYPE_NEXT_VARIANT (t)); | |
2533 | break; | |
2534 | } | |
2535 | } | |
60a2c645 JJ |
2536 | else |
2537 | for (tree t = TYPE_MAIN_VARIANT (remove); ; | |
2538 | t = TYPE_NEXT_VARIANT (t)) | |
2539 | if (TYPE_NEXT_VARIANT (t) == remove) | |
2540 | { | |
2541 | TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (remove); | |
2542 | break; | |
2543 | } | |
5fde6a45 MP |
2544 | } |
2545 | } | |
2546 | ||
3c6e6fbf | 2547 | /* Merge the data types specified in the two decls. */ |
1ef82ef2 ZW |
2548 | TREE_TYPE (newdecl) |
2549 | = TREE_TYPE (olddecl) | |
10bc1b1b | 2550 | = composite_type (newtype, oldtype); |
51e29401 | 2551 | |
3c6e6fbf | 2552 | /* Lay the type out, unless already done. */ |
2587f865 | 2553 | if (!comptypes (oldtype, TREE_TYPE (newdecl))) |
3c6e6fbf ZW |
2554 | { |
2555 | if (TREE_TYPE (newdecl) != error_mark_node) | |
2556 | layout_type (TREE_TYPE (newdecl)); | |
2557 | if (TREE_CODE (newdecl) != FUNCTION_DECL | |
2558 | && TREE_CODE (newdecl) != TYPE_DECL | |
2559 | && TREE_CODE (newdecl) != CONST_DECL) | |
2560 | layout_decl (newdecl, 0); | |
2561 | } | |
2562 | else | |
2563 | { | |
2564 | /* Since the type is OLDDECL's, make OLDDECL's size go with. */ | |
2565 | DECL_SIZE (newdecl) = DECL_SIZE (olddecl); | |
2566 | DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl); | |
899ca90e | 2567 | SET_DECL_MODE (newdecl, DECL_MODE (olddecl)); |
837edd5f GK |
2568 | if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl)) |
2569 | { | |
fe37c7af | 2570 | SET_DECL_ALIGN (newdecl, DECL_ALIGN (olddecl)); |
8220334a | 2571 | DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl); |
837edd5f | 2572 | } |
00aa1fa2 L |
2573 | if (DECL_WARN_IF_NOT_ALIGN (olddecl) |
2574 | > DECL_WARN_IF_NOT_ALIGN (newdecl)) | |
2575 | SET_DECL_WARN_IF_NOT_ALIGN (newdecl, | |
2576 | DECL_WARN_IF_NOT_ALIGN (olddecl)); | |
3c6e6fbf | 2577 | } |
fc542d3c | 2578 | |
9a60b229 JJ |
2579 | /* Keep the old rtl since we can safely use it. */ |
2580 | if (HAS_RTL_P (olddecl)) | |
2581 | COPY_DECL_RTL (olddecl, newdecl); | |
17aec3eb | 2582 | |
3c6e6fbf ZW |
2583 | /* Merge the type qualifiers. */ |
2584 | if (TREE_READONLY (newdecl)) | |
1ef82ef2 | 2585 | TREE_READONLY (olddecl) = 1; |
facef326 | 2586 | |
3c6e6fbf | 2587 | if (TREE_THIS_VOLATILE (newdecl)) |
ee9f69b4 | 2588 | TREE_THIS_VOLATILE (olddecl) = 1; |
3c6e6fbf | 2589 | |
302a2cc5 JM |
2590 | /* Merge deprecatedness. */ |
2591 | if (TREE_DEPRECATED (newdecl)) | |
2592 | TREE_DEPRECATED (olddecl) = 1; | |
2593 | ||
238fe3c5 RAE |
2594 | /* If a decl is in a system header and the other isn't, keep the one on the |
2595 | system header. Otherwise, keep source location of definition rather than | |
2596 | declaration and of prototype rather than non-prototype unless that | |
2597 | prototype is built-in. */ | |
2598 | if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS) | |
2599 | && DECL_IN_SYSTEM_HEADER (olddecl) | |
2600 | && !DECL_IN_SYSTEM_HEADER (newdecl) ) | |
aa14403d | 2601 | DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl); |
238fe3c5 RAE |
2602 | else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS) |
2603 | && DECL_IN_SYSTEM_HEADER (newdecl) | |
2604 | && !DECL_IN_SYSTEM_HEADER (olddecl)) | |
aa14403d | 2605 | DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl); |
3fa8871b MP |
2606 | else if ((DECL_INITIAL (newdecl) == NULL_TREE |
2607 | && DECL_INITIAL (olddecl) != NULL_TREE) | |
238fe3c5 RAE |
2608 | || (old_is_prototype && !new_is_prototype |
2609 | && !C_DECL_BUILTIN_PROTOTYPE (olddecl))) | |
3c6e6fbf ZW |
2610 | DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl); |
2611 | ||
3c6e6fbf | 2612 | /* Merge the initialization information. */ |
3fa8871b | 2613 | if (DECL_INITIAL (newdecl) == NULL_TREE) |
3c6e6fbf ZW |
2614 | DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl); |
2615 | ||
953ff289 | 2616 | /* Merge the threadprivate attribute. */ |
0ae9bd27 | 2617 | if (VAR_P (olddecl) && C_DECL_THREADPRIVATE_P (olddecl)) |
5fcffe51 | 2618 | C_DECL_THREADPRIVATE_P (newdecl) = 1; |
953ff289 | 2619 | |
fbbc17c7 MS |
2620 | if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)) |
2621 | { | |
fbbc17c7 MS |
2622 | /* Copy the assembler name. |
2623 | Currently, it can only be defined in the prototype. */ | |
2624 | COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl); | |
2625 | ||
2626 | /* Use visibility of whichever declaration had it specified */ | |
2627 | if (DECL_VISIBILITY_SPECIFIED (olddecl)) | |
2628 | { | |
2629 | DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl); | |
2630 | DECL_VISIBILITY_SPECIFIED (newdecl) = 1; | |
2631 | } | |
2632 | ||
2633 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2634 | { | |
2635 | DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl); | |
2636 | DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl); | |
2637 | DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl); | |
2638 | DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl) | |
2639 | |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl); | |
2640 | TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl); | |
fbbc17c7 | 2641 | DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl); |
1ea193c2 | 2642 | DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl); |
becfd6e5 KZ |
2643 | TREE_READONLY (newdecl) |= TREE_READONLY (olddecl); |
2644 | DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl); | |
fbbc17c7 MS |
2645 | DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl); |
2646 | } | |
2647 | ||
2648 | /* Merge the storage class information. */ | |
2649 | merge_weak (newdecl, olddecl); | |
2650 | ||
2651 | /* For functions, static overrides non-static. */ | |
2652 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2653 | { | |
2654 | TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl); | |
2655 | /* This is since we don't automatically | |
2656 | copy the attributes of NEWDECL into OLDDECL. */ | |
2657 | TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl); | |
2658 | /* If this clears `static', clear it in the identifier too. */ | |
2659 | if (!TREE_PUBLIC (olddecl)) | |
2660 | TREE_PUBLIC (DECL_NAME (olddecl)) = 0; | |
2661 | } | |
2662 | } | |
2663 | ||
4eb7fd83 JJ |
2664 | /* In c99, 'extern' declaration before (or after) 'inline' means this |
2665 | function is not DECL_EXTERNAL, unless 'gnu_inline' attribute | |
2666 | is present. */ | |
2667 | if (TREE_CODE (newdecl) == FUNCTION_DECL | |
da1c7394 | 2668 | && !flag_gnu89_inline |
4eb7fd83 JJ |
2669 | && (DECL_DECLARED_INLINE_P (newdecl) |
2670 | || DECL_DECLARED_INLINE_P (olddecl)) | |
2671 | && (!DECL_DECLARED_INLINE_P (newdecl) | |
2672 | || !DECL_DECLARED_INLINE_P (olddecl) | |
2673 | || !DECL_EXTERNAL (olddecl)) | |
2674 | && DECL_EXTERNAL (newdecl) | |
6cf59865 | 2675 | && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl)) |
74b0ec7c | 2676 | && !current_function_decl) |
4eb7fd83 | 2677 | DECL_EXTERNAL (newdecl) = 0; |
71113fcd | 2678 | |
6763b9f7 JM |
2679 | /* An inline definition following a static declaration is not |
2680 | DECL_EXTERNAL. */ | |
2681 | if (new_is_definition | |
2682 | && (DECL_DECLARED_INLINE_P (newdecl) | |
2683 | || DECL_DECLARED_INLINE_P (olddecl)) | |
2684 | && !TREE_PUBLIC (olddecl)) | |
2685 | DECL_EXTERNAL (newdecl) = 0; | |
2686 | ||
fbbc17c7 MS |
2687 | if (DECL_EXTERNAL (newdecl)) |
2688 | { | |
2689 | TREE_STATIC (newdecl) = TREE_STATIC (olddecl); | |
2690 | DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl); | |
2691 | ||
2692 | /* An extern decl does not override previous storage class. */ | |
2693 | TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl); | |
2694 | if (!DECL_EXTERNAL (newdecl)) | |
2695 | { | |
2696 | DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl); | |
2697 | DECL_COMMON (newdecl) = DECL_COMMON (olddecl); | |
2698 | } | |
2699 | } | |
2700 | else | |
2701 | { | |
2702 | TREE_STATIC (olddecl) = TREE_STATIC (newdecl); | |
2703 | TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl); | |
2704 | } | |
2705 | ||
2706 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2707 | { | |
2708 | /* If we're redefining a function previously defined as extern | |
2709 | inline, make sure we emit debug info for the inline before we | |
2710 | throw it away, in case it was inlined into a function that | |
2711 | hasn't been written out yet. */ | |
2712 | if (new_is_definition && DECL_INITIAL (olddecl)) | |
500b9ca1 JJ |
2713 | /* The new defn must not be inline. */ |
2714 | DECL_UNINLINABLE (newdecl) = 1; | |
fbbc17c7 MS |
2715 | else |
2716 | { | |
2717 | /* If either decl says `inline', this fn is inline, unless | |
2718 | its definition was passed already. */ | |
2719 | if (DECL_DECLARED_INLINE_P (newdecl) | |
2720 | || DECL_DECLARED_INLINE_P (olddecl)) | |
2721 | DECL_DECLARED_INLINE_P (newdecl) = 1; | |
2722 | ||
2723 | DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl) | |
2724 | = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)); | |
c536a6a7 RG |
2725 | |
2726 | DECL_DISREGARD_INLINE_LIMITS (newdecl) | |
2727 | = DECL_DISREGARD_INLINE_LIMITS (olddecl) | |
2728 | = (DECL_DISREGARD_INLINE_LIMITS (newdecl) | |
2729 | || DECL_DISREGARD_INLINE_LIMITS (olddecl)); | |
fbbc17c7 MS |
2730 | } |
2731 | ||
3d78e008 | 2732 | if (fndecl_built_in_p (olddecl)) |
fbbc17c7 MS |
2733 | { |
2734 | /* If redeclaring a builtin function, it stays built in. | |
2735 | But it gets tagged as having been declared. */ | |
2736 | DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl); | |
2737 | DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl); | |
2738 | C_DECL_DECLARED_BUILTIN (newdecl) = 1; | |
2739 | if (new_is_prototype) | |
8b57bfeb JJ |
2740 | { |
2741 | C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0; | |
2742 | if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL) | |
e79983f4 MM |
2743 | { |
2744 | enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl); | |
2745 | switch (fncode) | |
2746 | { | |
2747 | /* If a compatible prototype of these builtin functions | |
2748 | is seen, assume the runtime implements it with the | |
2749 | expected semantics. */ | |
2750 | case BUILT_IN_STPCPY: | |
2751 | if (builtin_decl_explicit_p (fncode)) | |
2752 | set_builtin_decl_implicit_p (fncode, true); | |
2753 | break; | |
2754 | default: | |
cbf5d0e7 RB |
2755 | if (builtin_decl_explicit_p (fncode)) |
2756 | set_builtin_decl_declared_p (fncode, true); | |
e79983f4 MM |
2757 | break; |
2758 | } | |
bc1a75dd JJ |
2759 | |
2760 | copy_attributes_to_builtin (newdecl); | |
e79983f4 | 2761 | } |
8b57bfeb | 2762 | } |
fbbc17c7 MS |
2763 | else |
2764 | C_DECL_BUILTIN_PROTOTYPE (newdecl) | |
2765 | = C_DECL_BUILTIN_PROTOTYPE (olddecl); | |
2766 | } | |
2767 | ||
ab442df7 MM |
2768 | /* Preserve function specific target and optimization options */ |
2769 | if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl) | |
2770 | && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl)) | |
2771 | DECL_FUNCTION_SPECIFIC_TARGET (newdecl) | |
2772 | = DECL_FUNCTION_SPECIFIC_TARGET (olddecl); | |
2773 | ||
2774 | if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl) | |
2775 | && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)) | |
2776 | DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl) | |
2777 | = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl); | |
2778 | ||
fbbc17c7 MS |
2779 | /* Also preserve various other info from the definition. */ |
2780 | if (!new_is_definition) | |
2781 | { | |
dcb6e951 | 2782 | tree t; |
fbbc17c7 MS |
2783 | DECL_RESULT (newdecl) = DECL_RESULT (olddecl); |
2784 | DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl); | |
2785 | DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl); | |
2786 | DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl); | |
dcb6e951 | 2787 | DECL_ARGUMENTS (newdecl) = copy_list (DECL_ARGUMENTS (olddecl)); |
910ad8de | 2788 | for (t = DECL_ARGUMENTS (newdecl); t ; t = DECL_CHAIN (t)) |
dcb6e951 | 2789 | DECL_CONTEXT (t) = newdecl; |
fbbc17c7 | 2790 | |
54dfd46b JH |
2791 | /* See if we've got a function to instantiate from. */ |
2792 | if (DECL_SAVED_TREE (olddecl)) | |
2793 | DECL_ABSTRACT_ORIGIN (newdecl) | |
2794 | = DECL_ABSTRACT_ORIGIN (olddecl); | |
fbbc17c7 MS |
2795 | } |
2796 | } | |
2797 | ||
a35120a3 L |
2798 | /* Merge the USED information. */ |
2799 | if (TREE_USED (olddecl)) | |
2800 | TREE_USED (newdecl) = 1; | |
2801 | else if (TREE_USED (newdecl)) | |
2802 | TREE_USED (olddecl) = 1; | |
0ae9bd27 | 2803 | if (VAR_P (olddecl) || TREE_CODE (olddecl) == PARM_DECL) |
ebfbbdc5 | 2804 | DECL_READ_P (newdecl) |= DECL_READ_P (olddecl); |
c387e067 MS |
2805 | if (DECL_PRESERVE_P (olddecl)) |
2806 | DECL_PRESERVE_P (newdecl) = 1; | |
2807 | else if (DECL_PRESERVE_P (newdecl)) | |
2808 | DECL_PRESERVE_P (olddecl) = 1; | |
e27fb29c | 2809 | |
c2d47482 PK |
2810 | /* Merge DECL_COMMON */ |
2811 | if (VAR_P (olddecl) && VAR_P (newdecl) | |
2812 | && !lookup_attribute ("common", DECL_ATTRIBUTES (newdecl)) | |
2813 | && !lookup_attribute ("nocommon", DECL_ATTRIBUTES (newdecl))) | |
2814 | DECL_COMMON (newdecl) = DECL_COMMON (newdecl) && DECL_COMMON (olddecl); | |
2815 | ||
fbbc17c7 | 2816 | /* Copy most of the decl-specific fields of NEWDECL into OLDDECL. |
f9417da1 RG |
2817 | But preserve OLDDECL's DECL_UID, DECL_CONTEXT and |
2818 | DECL_ARGUMENTS (if appropriate). */ | |
850cba29 | 2819 | { |
b3694847 | 2820 | unsigned olddecl_uid = DECL_UID (olddecl); |
9affb2c7 | 2821 | tree olddecl_context = DECL_CONTEXT (olddecl); |
dcb6e951 RAE |
2822 | tree olddecl_arguments = NULL; |
2823 | if (TREE_CODE (olddecl) == FUNCTION_DECL) | |
2824 | olddecl_arguments = DECL_ARGUMENTS (olddecl); | |
c22cacf3 | 2825 | |
da61dec9 JM |
2826 | memcpy ((char *) olddecl + sizeof (struct tree_common), |
2827 | (char *) newdecl + sizeof (struct tree_common), | |
820cc88f | 2828 | sizeof (struct tree_decl_common) - sizeof (struct tree_common)); |
45f41865 | 2829 | DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl); |
820cc88f DB |
2830 | switch (TREE_CODE (olddecl)) |
2831 | { | |
726a989a | 2832 | case FUNCTION_DECL: |
820cc88f | 2833 | case VAR_DECL: |
aede2c10 JH |
2834 | { |
2835 | struct symtab_node *snode = olddecl->decl_with_vis.symtab_node; | |
2836 | ||
2837 | memcpy ((char *) olddecl + sizeof (struct tree_decl_common), | |
2838 | (char *) newdecl + sizeof (struct tree_decl_common), | |
2839 | tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common)); | |
2840 | olddecl->decl_with_vis.symtab_node = snode; | |
5fcffe51 MT |
2841 | |
2842 | if ((DECL_EXTERNAL (olddecl) | |
2843 | || TREE_PUBLIC (olddecl) | |
2844 | || TREE_STATIC (olddecl)) | |
2845 | && DECL_SECTION_NAME (newdecl) != NULL) | |
2846 | set_decl_section_name (olddecl, DECL_SECTION_NAME (newdecl)); | |
2847 | ||
2848 | /* This isn't quite correct for something like | |
2849 | int __thread x attribute ((tls_model ("local-exec"))); | |
2850 | extern int __thread x; | |
2851 | as we'll lose the "local-exec" model. */ | |
0ae9bd27 | 2852 | if (VAR_P (olddecl) && DECL_THREAD_LOCAL_P (newdecl)) |
5fcffe51 | 2853 | set_decl_tls_model (olddecl, DECL_TLS_MODEL (newdecl)); |
aede2c10 JH |
2854 | break; |
2855 | } | |
2856 | ||
2857 | case FIELD_DECL: | |
820cc88f DB |
2858 | case PARM_DECL: |
2859 | case LABEL_DECL: | |
2860 | case RESULT_DECL: | |
2861 | case CONST_DECL: | |
2862 | case TYPE_DECL: | |
820cc88f DB |
2863 | memcpy ((char *) olddecl + sizeof (struct tree_decl_common), |
2864 | (char *) newdecl + sizeof (struct tree_decl_common), | |
2865 | tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common)); | |
2866 | break; | |
2867 | ||
2868 | default: | |
c22cacf3 | 2869 | |
820cc88f DB |
2870 | memcpy ((char *) olddecl + sizeof (struct tree_decl_common), |
2871 | (char *) newdecl + sizeof (struct tree_decl_common), | |
2872 | sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)); | |
2873 | } | |
850cba29 | 2874 | DECL_UID (olddecl) = olddecl_uid; |
9affb2c7 | 2875 | DECL_CONTEXT (olddecl) = olddecl_context; |
dcb6e951 RAE |
2876 | if (TREE_CODE (olddecl) == FUNCTION_DECL) |
2877 | DECL_ARGUMENTS (olddecl) = olddecl_arguments; | |
850cba29 | 2878 | } |
51e29401 | 2879 | |
2306d91c RH |
2880 | /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl |
2881 | so that encode_section_info has a chance to look at the new decl | |
2882 | flags and attributes. */ | |
2883 | if (DECL_RTL_SET_P (olddecl) | |
2884 | && (TREE_CODE (olddecl) == FUNCTION_DECL | |
0ae9bd27 | 2885 | || (VAR_P (olddecl) && TREE_STATIC (olddecl)))) |
0e6df31e | 2886 | make_decl_rtl (olddecl); |
51e29401 RS |
2887 | } |
2888 | ||
3c6e6fbf ZW |
2889 | /* Handle when a new declaration NEWDECL has the same name as an old |
2890 | one OLDDECL in the same binding contour. Prints an error message | |
2891 | if appropriate. | |
2892 | ||
2893 | If safely possible, alter OLDDECL to look like NEWDECL, and return | |
1ef82ef2 | 2894 | true. Otherwise, return false. */ |
3c6e6fbf ZW |
2895 | |
2896 | static bool | |
1ef82ef2 | 2897 | duplicate_decls (tree newdecl, tree olddecl) |
3c6e6fbf | 2898 | { |
6de9cd9a | 2899 | tree newtype = NULL, oldtype = NULL; |
3c6e6fbf ZW |
2900 | |
2901 | if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype)) | |
f95f80d1 | 2902 | { |
f9837879 | 2903 | /* Avoid `unused variable' and other warnings for OLDDECL. */ |
f95f80d1 SB |
2904 | TREE_NO_WARNING (olddecl) = 1; |
2905 | return false; | |
2906 | } | |
3c6e6fbf | 2907 | |
1ef82ef2 | 2908 | merge_decls (newdecl, olddecl, newtype, oldtype); |
aede2c10 | 2909 | |
22e1cf1c JH |
2910 | /* The NEWDECL will no longer be needed. |
2911 | ||
2912 | Before releasing the node, be sure to remove function from symbol | |
2913 | table that might have been inserted there to record comdat group. | |
2914 | Be sure to however do not free DECL_STRUCT_FUNCTION because this | |
2915 | structure is shared in between NEWDECL and OLDECL. */ | |
2916 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2917 | DECL_STRUCT_FUNCTION (newdecl) = NULL; | |
21b634ae | 2918 | if (VAR_OR_FUNCTION_DECL_P (newdecl)) |
24d047a3 | 2919 | { |
d52f5295 | 2920 | struct symtab_node *snode = symtab_node::get (newdecl); |
24d047a3 | 2921 | if (snode) |
d52f5295 | 2922 | snode->remove (); |
24d047a3 | 2923 | } |
aede2c10 | 2924 | ggc_free (newdecl); |
1ef82ef2 | 2925 | return true; |
3c6e6fbf | 2926 | } |
118a3a8b | 2927 | |
3c6e6fbf | 2928 | \f |
1ad463f4 | 2929 | /* Check whether decl-node NEW_DECL shadows an existing declaration. */ |
339a28b9 | 2930 | static void |
1ad463f4 | 2931 | warn_if_shadowing (tree new_decl) |
339a28b9 | 2932 | { |
f75fbaf7 | 2933 | struct c_binding *b; |
339a28b9 | 2934 | |
f75fbaf7 | 2935 | /* Shadow warnings wanted? */ |
84ff4775 LCW |
2936 | if (!(warn_shadow |
2937 | || warn_shadow_local | |
2938 | || warn_shadow_compatible_local) | |
339a28b9 | 2939 | /* No shadow warnings for internally generated vars. */ |
0edf3afe | 2940 | || DECL_IS_BUILTIN (new_decl)) |
26f943fd NB |
2941 | return; |
2942 | ||
9aaabf8a | 2943 | /* Is anything being shadowed? Invisible decls do not count. */ |
1ad463f4 | 2944 | for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed) |
1d551e4d AM |
2945 | if (b->decl && b->decl != new_decl && !b->invisible |
2946 | && (b->decl == error_mark_node | |
2947 | || diagnostic_report_warnings_p (global_dc, | |
2948 | DECL_SOURCE_LOCATION (b->decl)))) | |
f75fbaf7 | 2949 | { |
1ad463f4 | 2950 | tree old_decl = b->decl; |
f75fbaf7 | 2951 | |
d8dd2f3a JJ |
2952 | if (old_decl == error_mark_node) |
2953 | { | |
b9b8dde3 DD |
2954 | warning (OPT_Wshadow, "declaration of %q+D shadows previous " |
2955 | "non-variable", new_decl); | |
d8dd2f3a JJ |
2956 | break; |
2957 | } | |
097f82ec DM |
2958 | |
2959 | bool warned = false; | |
2960 | auto_diagnostic_group d; | |
2961 | if (TREE_CODE (old_decl) == PARM_DECL) | |
84ff4775 LCW |
2962 | { |
2963 | enum opt_code warning_code; | |
2964 | ||
2965 | /* If '-Wshadow=compatible-local' is specified without other | |
2966 | -Wshadow= flags, we will warn only when the types of the | |
2967 | shadowing variable (i.e. new_decl) and the shadowed variable | |
2968 | (old_decl) are compatible. */ | |
2969 | if (warn_shadow) | |
2970 | warning_code = OPT_Wshadow; | |
2971 | else if (comptypes (TREE_TYPE (old_decl), TREE_TYPE (new_decl))) | |
2972 | warning_code = OPT_Wshadow_compatible_local; | |
2973 | else | |
2974 | warning_code = OPT_Wshadow_local; | |
2975 | warned = warning_at (DECL_SOURCE_LOCATION (new_decl), warning_code, | |
2976 | "declaration of %qD shadows a parameter", | |
2977 | new_decl); | |
2978 | } | |
b9b8dde3 | 2979 | else if (DECL_FILE_SCOPE_P (old_decl)) |
077d1abe MLI |
2980 | { |
2981 | /* Do not warn if a variable shadows a function, unless | |
2982 | the variable is a function or a pointer-to-function. */ | |
2983 | if (TREE_CODE (old_decl) == FUNCTION_DECL | |
2984 | && TREE_CODE (new_decl) != FUNCTION_DECL | |
2985 | && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl))) | |
2986 | continue; | |
2987 | ||
6447c55d MP |
2988 | warned = warning_at (DECL_SOURCE_LOCATION (new_decl), OPT_Wshadow, |
2989 | "declaration of %qD shadows a global " | |
2990 | "declaration", | |
2991 | new_decl); | |
077d1abe | 2992 | } |
1ad463f4 | 2993 | else if (TREE_CODE (old_decl) == FUNCTION_DECL |
3d78e008 | 2994 | && fndecl_built_in_p (old_decl)) |
d8dd2f3a | 2995 | { |
b9b8dde3 DD |
2996 | warning (OPT_Wshadow, "declaration of %q+D shadows " |
2997 | "a built-in function", new_decl); | |
d8dd2f3a JJ |
2998 | break; |
2999 | } | |
f75fbaf7 | 3000 | else |
84ff4775 LCW |
3001 | { |
3002 | enum opt_code warning_code; | |
3003 | ||
3004 | /* If '-Wshadow=compatible-local' is specified without other | |
3005 | -Wshadow= flags, we will warn only when the types of the | |
3006 | shadowing variable (i.e. new_decl) and the shadowed variable | |
3007 | (old_decl) are compatible. */ | |
3008 | if (warn_shadow) | |
3009 | warning_code = OPT_Wshadow; | |
3010 | else if (comptypes (TREE_TYPE (old_decl), TREE_TYPE (new_decl))) | |
3011 | warning_code = OPT_Wshadow_compatible_local; | |
3012 | else | |
3013 | warning_code = OPT_Wshadow_local; | |
3014 | warned = warning_at (DECL_SOURCE_LOCATION (new_decl), warning_code, | |
3015 | "declaration of %qD shadows a previous local", | |
3016 | new_decl); | |
3017 | } | |
f75fbaf7 | 3018 | |
6447c55d MP |
3019 | if (warned) |
3020 | inform (DECL_SOURCE_LOCATION (old_decl), | |
3021 | "shadowed declaration is here"); | |
a6f78652 | 3022 | |
f75fbaf7 ZW |
3023 | break; |
3024 | } | |
339a28b9 ZW |
3025 | } |
3026 | ||
51e29401 RS |
3027 | /* Record a decl-node X as belonging to the current lexical scope. |
3028 | Check for errors (such as an incompatible declaration for the same | |
3029 | name already seen in the same scope). | |
3030 | ||
3031 | Returns either X or an old decl for the same name. | |
3032 | If an old decl is returned, it may have been smashed | |
3033 | to agree with what X says. */ | |
3034 | ||
3035 | tree | |
35b1a6fa | 3036 | pushdecl (tree x) |
51e29401 | 3037 | { |
b3694847 | 3038 | tree name = DECL_NAME (x); |
f8521984 | 3039 | struct c_scope *scope = current_scope; |
f75fbaf7 | 3040 | struct c_binding *b; |
9aaabf8a | 3041 | bool nested = false; |
b3f27c15 | 3042 | location_t locus = DECL_SOURCE_LOCATION (x); |
51e29401 | 3043 | |
eecec698 ZW |
3044 | /* Must set DECL_CONTEXT for everything not at file scope or |
3045 | DECL_FILE_SCOPE_P won't work. Local externs don't count | |
3046 | unless they have initializers (which generate code). */ | |
3047 | if (current_function_decl | |
21b634ae | 3048 | && (!VAR_OR_FUNCTION_DECL_P (x) |
eecec698 | 3049 | || DECL_INITIAL (x) || !DECL_EXTERNAL (x))) |
339a28b9 | 3050 | DECL_CONTEXT (x) = current_function_decl; |
e13e48e7 | 3051 | |
f75fbaf7 ZW |
3052 | /* Anonymous decls are just inserted in the scope. */ |
3053 | if (!name) | |
51e29401 | 3054 | { |
b3f27c15 JJ |
3055 | bind (name, x, scope, /*invisible=*/false, /*nested=*/false, |
3056 | locus); | |
f75fbaf7 ZW |
3057 | return x; |
3058 | } | |
3059 | ||
3060 | /* First, see if there is another declaration with the same name in | |
3061 | the current scope. If there is, duplicate_decls may do all the | |
3062 | work for us. If duplicate_decls returns false, that indicates | |
3063 | two incompatible decls in the same scope; we are to silently | |
3064 | replace the old one (duplicate_decls has issued all appropriate | |
3065 | diagnostics). In particular, we should not consider possible | |
3066 | duplicates in the external scope, or shadowing. */ | |
3067 | b = I_SYMBOL_BINDING (name); | |
9aaabf8a | 3068 | if (b && B_IN_SCOPE (b, scope)) |
f75fbaf7 | 3069 | { |
2798c11f JM |
3070 | struct c_binding *b_ext, *b_use; |
3071 | tree type = TREE_TYPE (x); | |
3072 | tree visdecl = b->decl; | |
3073 | tree vistype = TREE_TYPE (visdecl); | |
0b410f0b JM |
3074 | if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE |
3075 | && COMPLETE_TYPE_P (TREE_TYPE (x))) | |
3076 | b->inner_comp = false; | |
2798c11f JM |
3077 | b_use = b; |
3078 | b_ext = b; | |
3079 | /* If this is an external linkage declaration, we should check | |
3080 | for compatibility with the type in the external scope before | |
3081 | setting the type at this scope based on the visible | |
3082 | information only. */ | |
3083 | if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl)) | |
3084 | { | |
3085 | while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext)) | |
3086 | b_ext = b_ext->shadowed; | |
3087 | if (b_ext) | |
3088 | { | |
3089 | b_use = b_ext; | |
e1b7793c ILT |
3090 | if (b_use->u.type) |
3091 | TREE_TYPE (b_use->decl) = b_use->u.type; | |
2798c11f JM |
3092 | } |
3093 | } | |
3094 | if (duplicate_decls (x, b_use->decl)) | |
3095 | { | |
3096 | if (b_use != b) | |
3097 | { | |
3098 | /* Save the updated type in the external scope and | |
3099 | restore the proper type for this scope. */ | |
3100 | tree thistype; | |
3101 | if (comptypes (vistype, type)) | |
3102 | thistype = composite_type (vistype, type); | |
3103 | else | |
3104 | thistype = TREE_TYPE (b_use->decl); | |
e1b7793c | 3105 | b_use->u.type = TREE_TYPE (b_use->decl); |
2798c11f | 3106 | if (TREE_CODE (b_use->decl) == FUNCTION_DECL |
3d78e008 | 3107 | && fndecl_built_in_p (b_use->decl)) |
2798c11f JM |
3108 | thistype |
3109 | = build_type_attribute_variant (thistype, | |
3110 | TYPE_ATTRIBUTES | |
e1b7793c | 3111 | (b_use->u.type)); |
2798c11f JM |
3112 | TREE_TYPE (b_use->decl) = thistype; |
3113 | } | |
3114 | return b_use->decl; | |
3115 | } | |
f75fbaf7 ZW |
3116 | else |
3117 | goto skip_external_and_shadow_checks; | |
3118 | } | |
3119 | ||
3120 | /* All declarations with external linkage, and all external | |
3121 | references, go in the external scope, no matter what scope is | |
3122 | current. However, the binding in that scope is ignored for | |
3123 | purposes of normal name lookup. A separate binding structure is | |
3124 | created in the requested scope; this governs the normal | |
3125 | visibility of the symbol. | |
51e29401 | 3126 | |
f75fbaf7 ZW |
3127 | The binding in the externals scope is used exclusively for |
3128 | detecting duplicate declarations of the same object, no matter | |
3129 | what scope they are in; this is what we do here. (C99 6.2.7p2: | |
3130 | All declarations that refer to the same object or function shall | |
3131 | have compatible type; otherwise, the behavior is undefined.) */ | |
3132 | if (DECL_EXTERNAL (x) || scope == file_scope) | |
3133 | { | |
0b410f0b | 3134 | tree type = TREE_TYPE (x); |
3fa8871b MP |
3135 | tree vistype = NULL_TREE; |
3136 | tree visdecl = NULL_TREE; | |
0b410f0b JM |
3137 | bool type_saved = false; |
3138 | if (b && !B_IN_EXTERNAL_SCOPE (b) | |
21b634ae | 3139 | && VAR_OR_FUNCTION_DECL_P (b->decl) |
0b410f0b JM |
3140 | && DECL_FILE_SCOPE_P (b->decl)) |
3141 | { | |
3142 | visdecl = b->decl; | |
3143 | vistype = TREE_TYPE (visdecl); | |
3144 | } | |
3176a0c2 | 3145 | if (scope != file_scope |
234f46ae | 3146 | && !DECL_IN_SYSTEM_HEADER (x)) |
b02a5e26 MP |
3147 | warning_at (locus, OPT_Wnested_externs, |
3148 | "nested extern declaration of %qD", x); | |
234f46ae | 3149 | |
9aaabf8a | 3150 | while (b && !B_IN_EXTERNAL_SCOPE (b)) |
0b410f0b JM |
3151 | { |
3152 | /* If this decl might be modified, save its type. This is | |
3153 | done here rather than when the decl is first bound | |
3154 | because the type may change after first binding, through | |
3155 | being completed or through attributes being added. If we | |
3156 | encounter multiple such decls, only the first should have | |
3157 | its type saved; the others will already have had their | |
3158 | proper types saved and the types will not have changed as | |
3159 | their scopes will not have been re-entered. */ | |
d8dd2f3a | 3160 | if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved) |
0b410f0b | 3161 | { |
e1b7793c | 3162 | b->u.type = TREE_TYPE (b->decl); |
0b410f0b JM |
3163 | type_saved = true; |
3164 | } | |
3165 | if (B_IN_FILE_SCOPE (b) | |
0ae9bd27 | 3166 | && VAR_P (b->decl) |
0b410f0b JM |
3167 | && TREE_STATIC (b->decl) |
3168 | && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE | |
3169 | && !TYPE_DOMAIN (TREE_TYPE (b->decl)) | |
3170 | && TREE_CODE (type) == ARRAY_TYPE | |
3171 | && TYPE_DOMAIN (type) | |
3172 | && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) | |
3173 | && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type)))) | |
3174 | { | |
3175 | /* Array type completed in inner scope, which should be | |
3176 | diagnosed if the completion does not have size 1 and | |
3177 | it does not get completed in the file scope. */ | |
3178 | b->inner_comp = true; | |
3179 | } | |
3180 | b = b->shadowed; | |
3181 | } | |
3182 | ||
3183 | /* If a matching external declaration has been found, set its | |
3184 | type to the composite of all the types of that declaration. | |
3185 | After the consistency checks, it will be reset to the | |
3186 | composite of the visible types only. */ | |
3187 | if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl)) | |
e1b7793c ILT |
3188 | && b->u.type) |
3189 | TREE_TYPE (b->decl) = b->u.type; | |
f75fbaf7 ZW |
3190 | |
3191 | /* The point of the same_translation_unit_p check here is, | |
3192 | we want to detect a duplicate decl for a construct like | |
3193 | foo() { extern bar(); } ... static bar(); but not if | |
3194 | they are in different translation units. In any case, | |
3195 | the static does not go in the externals scope. */ | |
3196 | if (b | |
9affb2c7 | 3197 | && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl)) |
f75fbaf7 | 3198 | && duplicate_decls (x, b->decl)) |
55d54003 | 3199 | { |
0b410f0b | 3200 | tree thistype; |
2798c11f JM |
3201 | if (vistype) |
3202 | { | |
3203 | if (comptypes (vistype, type)) | |
3204 | thistype = composite_type (vistype, type); | |
3205 | else | |
3206 | thistype = TREE_TYPE (b->decl); | |
3207 | } | |
3208 | else | |
3209 | thistype = type; | |
e1b7793c | 3210 | b->u.type = TREE_TYPE (b->decl); |
3d78e008 ML |
3211 | if (TREE_CODE (b->decl) == FUNCTION_DECL |
3212 | && fndecl_built_in_p (b->decl)) | |
0b410f0b JM |
3213 | thistype |
3214 | = build_type_attribute_variant (thistype, | |
e1b7793c | 3215 | TYPE_ATTRIBUTES (b->u.type)); |
0b410f0b | 3216 | TREE_TYPE (b->decl) = thistype; |
b3f27c15 JJ |
3217 | bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true, |
3218 | locus); | |
f75fbaf7 | 3219 | return b->decl; |
55d54003 | 3220 | } |
9affb2c7 | 3221 | else if (TREE_PUBLIC (x)) |
6645c3fa | 3222 | { |
0b410f0b JM |
3223 | if (visdecl && !b && duplicate_decls (x, visdecl)) |
3224 | { | |
3225 | /* An external declaration at block scope referring to a | |
3226 | visible entity with internal linkage. The composite | |
3227 | type will already be correct for this scope, so we | |
3228 | just need to fall through to make the declaration in | |
3229 | this scope. */ | |
3230 | nested = true; | |
1b36c818 | 3231 | x = visdecl; |
0b410f0b JM |
3232 | } |
3233 | else | |
3234 | { | |
3235 | bind (name, x, external_scope, /*invisible=*/true, | |
b3f27c15 | 3236 | /*nested=*/false, locus); |
0b410f0b JM |
3237 | nested = true; |
3238 | } | |
51e29401 | 3239 | } |
f75fbaf7 | 3240 | } |
35b1a6fa | 3241 | |
7c47d6e9 JM |
3242 | if (TREE_CODE (x) != PARM_DECL) |
3243 | warn_if_shadowing (x); | |
51e29401 | 3244 | |
f75fbaf7 ZW |
3245 | skip_external_and_shadow_checks: |
3246 | if (TREE_CODE (x) == TYPE_DECL) | |
3797cb21 DS |
3247 | { |
3248 | /* So this is a typedef, set its underlying type. */ | |
3249 | set_underlying_type (x); | |
3250 | ||
3251 | /* If X is a typedef defined in the current function, record it | |
3252 | for the purpose of implementing the -Wunused-local-typedefs | |
3253 | warning. */ | |
3254 | record_locally_defined_typedef (x); | |
3255 | } | |
51e29401 | 3256 | |
b3f27c15 | 3257 | bind (name, x, scope, /*invisible=*/false, nested, locus); |
f75fbaf7 ZW |
3258 | |
3259 | /* If x's type is incomplete because it's based on a | |
3260 | structure or union which has not yet been fully declared, | |
3261 | attach it to that structure or union type, so we can go | |
3262 | back and complete the variable declaration later, if the | |
3263 | structure or union gets fully declared. | |
51e29401 | 3264 | |
f75fbaf7 ZW |
3265 | If the input is erroneous, we can have error_mark in the type |
3266 | slot (e.g. "f(void a, ...)") - that doesn't count as an | |
3267 | incomplete type. */ | |
3268 | if (TREE_TYPE (x) != error_mark_node | |
3269 | && !COMPLETE_TYPE_P (TREE_TYPE (x))) | |
3270 | { | |
3271 | tree element = TREE_TYPE (x); | |
3272 | ||
3273 | while (TREE_CODE (element) == ARRAY_TYPE) | |
3274 | element = TREE_TYPE (element); | |
3275 | element = TYPE_MAIN_VARIANT (element); | |
3276 | ||
3e636daf | 3277 | if (RECORD_OR_UNION_TYPE_P (element) |
f75fbaf7 ZW |
3278 | && (TREE_CODE (x) != TYPE_DECL |
3279 | || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE) | |
3280 | && !COMPLETE_TYPE_P (element)) | |
3281 | C_TYPE_INCOMPLETE_VARS (element) | |
3282 | = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element)); | |
3283 | } | |
51e29401 RS |
3284 | return x; |
3285 | } | |
51e29401 | 3286 | \f |
85059a38 MP |
3287 | |
3288 | /* Issue a warning about implicit function declaration. ID is the function | |
3289 | identifier, OLDDECL is a declaration of the function in a different scope, | |
3290 | or NULL_TREE. */ | |
3291 | ||
f75fbaf7 | 3292 | static void |
30281de2 | 3293 | implicit_decl_warning (location_t loc, tree id, tree olddecl) |
f75fbaf7 | 3294 | { |
85059a38 MP |
3295 | if (!warn_implicit_function_declaration) |
3296 | return; | |
71205d17 | 3297 | |
85059a38 | 3298 | bool warned; |
097f82ec | 3299 | auto_diagnostic_group d; |
6c7a259b | 3300 | name_hint hint; |
85059a38 | 3301 | if (!olddecl) |
6c7a259b | 3302 | hint = lookup_name_fuzzy (id, FUZZY_LOOKUP_FUNCTION_NAME, loc); |
85059a38 MP |
3303 | |
3304 | if (flag_isoc99) | |
3305 | { | |
7e2de6df | 3306 | if (const char *suggestion = hint.suggestion ()) |
85059a38 MP |
3307 | { |
3308 | gcc_rich_location richloc (loc); | |
7e2de6df | 3309 | richloc.add_fixit_replace (suggestion); |
64a5912c DM |
3310 | warned = pedwarn (&richloc, OPT_Wimplicit_function_declaration, |
3311 | "implicit declaration of function %qE;" | |
3312 | " did you mean %qs?", | |
7e2de6df | 3313 | id, suggestion); |
85059a38 | 3314 | } |
b8698a0f | 3315 | else |
85059a38 MP |
3316 | warned = pedwarn (loc, OPT_Wimplicit_function_declaration, |
3317 | "implicit declaration of function %qE", id); | |
f75fbaf7 | 3318 | } |
7e2de6df | 3319 | else if (const char *suggestion = hint.suggestion ()) |
85059a38 MP |
3320 | { |
3321 | gcc_rich_location richloc (loc); | |
7e2de6df | 3322 | richloc.add_fixit_replace (suggestion); |
64a5912c | 3323 | warned = warning_at |
85059a38 MP |
3324 | (&richloc, OPT_Wimplicit_function_declaration, |
3325 | G_("implicit declaration of function %qE; did you mean %qs?"), | |
7e2de6df | 3326 | id, suggestion); |
85059a38 MP |
3327 | } |
3328 | else | |
3329 | warned = warning_at (loc, OPT_Wimplicit_function_declaration, | |
3330 | G_("implicit declaration of function %qE"), id); | |
3331 | ||
3332 | if (olddecl && warned) | |
3333 | locate_old_decl (olddecl); | |
6c7a259b DM |
3334 | |
3335 | if (!warned) | |
3336 | hint.suppress (); | |
f75fbaf7 ZW |
3337 | } |
3338 | ||
0382aaa0 MP |
3339 | /* This function represents mapping of a function code FCODE |
3340 | to its respective header. */ | |
3341 | ||
3342 | static const char * | |
3343 | header_for_builtin_fn (enum built_in_function fcode) | |
3344 | { | |
3345 | switch (fcode) | |
3346 | { | |
3347 | CASE_FLT_FN (BUILT_IN_ACOS): | |
3348 | CASE_FLT_FN (BUILT_IN_ACOSH): | |
3349 | CASE_FLT_FN (BUILT_IN_ASIN): | |
3350 | CASE_FLT_FN (BUILT_IN_ASINH): | |
3351 | CASE_FLT_FN (BUILT_IN_ATAN): | |
3352 | CASE_FLT_FN (BUILT_IN_ATANH): | |
3353 | CASE_FLT_FN (BUILT_IN_ATAN2): | |
3354 | CASE_FLT_FN (BUILT_IN_CBRT): | |
3355 | CASE_FLT_FN (BUILT_IN_CEIL): | |
c6cfa2bf | 3356 | CASE_FLT_FN_FLOATN_NX (BUILT_IN_CEIL): |
0382aaa0 | 3357 | CASE_FLT_FN (BUILT_IN_COPYSIGN): |
ee5fd23a | 3358 | CASE_FLT_FN_FLOATN_NX (BUILT_IN_COPYSIGN): |
0382aaa0 MP |
3359 | CASE_FLT_FN (BUILT_IN_COS): |
3360 | CASE_FLT_FN (BUILT_IN_COSH): | |
3361 | CASE_FLT_FN (BUILT_IN_ERF): | |
3362 | CASE_FLT_FN (BUILT_IN_ERFC): | |
3363 | CASE_FLT_FN (BUILT_IN_EXP): | |
3364 | CASE_FLT_FN (BUILT_IN_EXP2): | |
3365 | CASE_FLT_FN (BUILT_IN_EXPM1): | |
3366 | CASE_FLT_FN (BUILT_IN_FABS): | |
ee5fd23a | 3367 | CASE_FLT_FN_FLOATN_NX (BUILT_IN_FABS): |
0382aaa0 MP |
3368 | CASE_FLT_FN (BUILT_IN_FDIM): |
3369 | CASE_FLT_FN (BUILT_IN_FLOOR): | |
c6cfa2bf | 3370 | CASE_FLT_FN_FLOATN_NX (BUILT_IN_FLOOR): |
0382aaa0 | 3371 | CASE_FLT_FN (BUILT_IN_FMA): |
ee5fd23a | 3372 | CASE_FLT_FN_FLOATN_NX (BUILT_IN_FMA): |
0382aaa0 | 3373 | CASE_FLT_FN (BUILT_IN_FMAX): |
ee5fd23a | 3374 | CASE_FLT_FN_FLOATN_NX (BUILT_IN_FMAX): |
0382aaa0 | 3375 | CASE_FLT_FN (BUILT_IN_FMIN): |
ee5fd23a | 3376 | CASE_FLT_FN_FLOATN_NX (BUILT_IN_FMIN): |
0382aaa0 MP |
3377 | CASE_FLT_FN (BUILT_IN_FMOD): |
3378 | CASE_FLT_FN (BUILT_IN_FREXP): | |
3379 | CASE_FLT_FN (BUILT_IN_HYPOT): | |
3380 | CASE_FLT_FN (BUILT_IN_ILOGB): | |
3381 | CASE_FLT_FN (BUILT_IN_LDEXP): | |
3382 | CASE_FLT_FN (BUILT_IN_LGAMMA): | |
3383 | CASE_FLT_FN (BUILT_IN_LLRINT): | |
3384 | CASE_FLT_FN (BUILT_IN_LLROUND): | |
3385 | CASE_FLT_FN (BUILT_IN_LOG): | |
3386 | CASE_FLT_FN (BUILT_IN_LOG10): | |
3387 | CASE_FLT_FN (BUILT_IN_LOG1P): | |
3388 | CASE_FLT_FN (BUILT_IN_LOG2): | |
3389 | CASE_FLT_FN (BUILT_IN_LOGB): | |
3390 | CASE_FLT_FN (BUILT_IN_LRINT): | |
3391 | CASE_FLT_FN (BUILT_IN_LROUND): | |
3392 | CASE_FLT_FN (BUILT_IN_MODF): | |
3393 | CASE_FLT_FN (BUILT_IN_NAN): | |
3394 | CASE_FLT_FN (BUILT_IN_NEARBYINT): | |
c6cfa2bf | 3395 | CASE_FLT_FN_FLOATN_NX (BUILT_IN_NEARBYINT): |
0382aaa0 MP |
3396 | CASE_FLT_FN (BUILT_IN_NEXTAFTER): |
3397 | CASE_FLT_FN (BUILT_IN_NEXTTOWARD): | |
3398 | CASE_FLT_FN (BUILT_IN_POW): | |
3399 | CASE_FLT_FN (BUILT_IN_REMAINDER): | |
3400 | CASE_FLT_FN (BUILT_IN_REMQUO): | |
3401 | CASE_FLT_FN (BUILT_IN_RINT): | |
c6cfa2bf | 3402 | CASE_FLT_FN_FLOATN_NX (BUILT_IN_RINT): |
0382aaa0 | 3403 | CASE_FLT_FN (BUILT_IN_ROUND): |
c6cfa2bf | 3404 | CASE_FLT_FN_FLOATN_NX (BUILT_IN_ROUND): |
0382aaa0 MP |
3405 | CASE_FLT_FN (BUILT_IN_SCALBLN): |
3406 | CASE_FLT_FN (BUILT_IN_SCALBN): | |
3407 | CASE_FLT_FN (BUILT_IN_SIN): | |
3408 | CASE_FLT_FN (BUILT_IN_SINH): | |
3409 | CASE_FLT_FN (BUILT_IN_SINCOS): | |
3410 | CASE_FLT_FN (BUILT_IN_SQRT): | |
ee5fd23a | 3411 | CASE_FLT_FN_FLOATN_NX (BUILT_IN_SQRT): |
0382aaa0 MP |
3412 | CASE_FLT_FN (BUILT_IN_TAN): |
3413 | CASE_FLT_FN (BUILT_IN_TANH): | |
3414 | CASE_FLT_FN (BUILT_IN_TGAMMA): | |
3415 | CASE_FLT_FN (BUILT_IN_TRUNC): | |
c6cfa2bf | 3416 | CASE_FLT_FN_FLOATN_NX (BUILT_IN_TRUNC): |
0382aaa0 MP |
3417 | case BUILT_IN_ISINF: |
3418 | case BUILT_IN_ISNAN: | |
3419 | return "<math.h>"; | |
3420 | CASE_FLT_FN (BUILT_IN_CABS): | |
3421 | CASE_FLT_FN (BUILT_IN_CACOS): | |
3422 | CASE_FLT_FN (BUILT_IN_CACOSH): | |
3423 | CASE_FLT_FN (BUILT_IN_CARG): | |
3424 | CASE_FLT_FN (BUILT_IN_CASIN): | |
3425 | CASE_FLT_FN (BUILT_IN_CASINH): | |
3426 | CASE_FLT_FN (BUILT_IN_CATAN): | |
3427 | CASE_FLT_FN (BUILT_IN_CATANH): | |
3428 | CASE_FLT_FN (BUILT_IN_CCOS): | |
3429 | CASE_FLT_FN (BUILT_IN_CCOSH): | |
3430 | CASE_FLT_FN (BUILT_IN_CEXP): | |
3431 | CASE_FLT_FN (BUILT_IN_CIMAG): | |
3432 | CASE_FLT_FN (BUILT_IN_CLOG): | |
3433 | CASE_FLT_FN (BUILT_IN_CONJ): | |
3434 | CASE_FLT_FN (BUILT_IN_CPOW): | |
3435 | CASE_FLT_FN (BUILT_IN_CPROJ): | |
3436 | CASE_FLT_FN (BUILT_IN_CREAL): | |
3437 | CASE_FLT_FN (BUILT_IN_CSIN): | |
3438 | CASE_FLT_FN (BUILT_IN_CSINH): | |
3439 | CASE_FLT_FN (BUILT_IN_CSQRT): | |
3440 | CASE_FLT_FN (BUILT_IN_CTAN): | |
3441 | CASE_FLT_FN (BUILT_IN_CTANH): | |
3442 | return "<complex.h>"; | |
3443 | case BUILT_IN_MEMCHR: | |
3444 | case BUILT_IN_MEMCMP: | |
3445 | case BUILT_IN_MEMCPY: | |
3446 | case BUILT_IN_MEMMOVE: | |
3447 | case BUILT_IN_MEMSET: | |
3448 | case BUILT_IN_STRCAT: | |
3449 | case BUILT_IN_STRCHR: | |
3450 | case BUILT_IN_STRCMP: | |
3451 | case BUILT_IN_STRCPY: | |
3452 | case BUILT_IN_STRCSPN: | |
3453 | case BUILT_IN_STRLEN: | |
3454 | case BUILT_IN_STRNCAT: | |
3455 | case BUILT_IN_STRNCMP: | |
3456 | case BUILT_IN_STRNCPY: | |
3457 | case BUILT_IN_STRPBRK: | |
3458 | case BUILT_IN_STRRCHR: | |
3459 | case BUILT_IN_STRSPN: | |
3460 | case BUILT_IN_STRSTR: | |
3461 | return "<string.h>"; | |
3462 | case BUILT_IN_FPRINTF: | |
3463 | case BUILT_IN_PUTC: | |
3464 | case BUILT_IN_FPUTC: | |
3465 | case BUILT_IN_FPUTS: | |
3466 | case BUILT_IN_FSCANF: | |
3467 | case BUILT_IN_FWRITE: | |
3468 | case BUILT_IN_PRINTF: | |
3469 | case BUILT_IN_PUTCHAR: | |
3470 | case BUILT_IN_PUTS: | |
3471 | case BUILT_IN_SCANF: | |
3472 | case BUILT_IN_SNPRINTF: | |
3473 | case BUILT_IN_SPRINTF: | |
3474 | case BUILT_IN_SSCANF: | |
3475 | case BUILT_IN_VFPRINTF: | |
3476 | case BUILT_IN_VFSCANF: | |
3477 | case BUILT_IN_VPRINTF: | |
3478 | case BUILT_IN_VSCANF: | |
3479 | case BUILT_IN_VSNPRINTF: | |
3480 | case BUILT_IN_VSPRINTF: | |
3481 | case BUILT_IN_VSSCANF: | |
3482 | return "<stdio.h>"; | |
3483 | case BUILT_IN_ISALNUM: | |
3484 | case BUILT_IN_ISALPHA: | |
3485 | case BUILT_IN_ISBLANK: | |
3486 | case BUILT_IN_ISCNTRL: | |
3487 | case BUILT_IN_ISDIGIT: | |
3488 | case BUILT_IN_ISGRAPH: | |
3489 | case BUILT_IN_ISLOWER: | |
3490 | case BUILT_IN_ISPRINT: | |
3491 | case BUILT_IN_ISPUNCT: | |
3492 | case BUILT_IN_ISSPACE: | |
3493 | case BUILT_IN_ISUPPER: | |
3494 | case BUILT_IN_ISXDIGIT: | |
3495 | case BUILT_IN_TOLOWER: | |
3496 | case BUILT_IN_TOUPPER: | |
3497 | return "<ctype.h>"; | |
3498 | case BUILT_IN_ISWALNUM: | |
3499 | case BUILT_IN_ISWALPHA: | |
3500 | case BUILT_IN_ISWBLANK: | |
3501 | case BUILT_IN_ISWCNTRL: | |
3502 | case BUILT_IN_ISWDIGIT: | |
3503 | case BUILT_IN_ISWGRAPH: | |
3504 | case BUILT_IN_ISWLOWER: | |
3505 | case BUILT_IN_ISWPRINT: | |
3506 | case BUILT_IN_ISWPUNCT: | |
3507 | case BUILT_IN_ISWSPACE: | |
3508 | case BUILT_IN_ISWUPPER: | |
3509 | case BUILT_IN_ISWXDIGIT: | |
3510 | case BUILT_IN_TOWLOWER: | |
3511 | case BUILT_IN_TOWUPPER: | |
3512 | return "<wctype.h>"; | |
3513 | case BUILT_IN_ABORT: | |
3514 | case BUILT_IN_ABS: | |
3515 | case BUILT_IN_CALLOC: | |
3516 | case BUILT_IN_EXIT: | |
3517 | case BUILT_IN_FREE: | |
3518 | case BUILT_IN_LABS: | |
3519 | case BUILT_IN_LLABS: | |
3520 | case BUILT_IN_MALLOC: | |
3521 | case BUILT_IN_REALLOC: | |
3522 | case BUILT_IN__EXIT2: | |
3523 | case BUILT_IN_ALIGNED_ALLOC: | |
3524 | return "<stdlib.h>"; | |
3525 | case BUILT_IN_IMAXABS: | |
3526 | return "<inttypes.h>"; | |
3527 | case BUILT_IN_STRFTIME: | |
3528 | return "<time.h>"; | |
3529 | default: | |
3530 | return NULL; | |
3531 | } | |
3532 | } | |
3533 | ||
c2255bc4 | 3534 | /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a |
339a28b9 | 3535 | function of type int (). */ |
51e29401 RS |
3536 | |
3537 | tree | |
c2255bc4 | 3538 | implicitly_declare (location_t loc, tree functionid) |
51e29401 | 3539 | { |
0b410f0b | 3540 | struct c_binding *b; |
3fa8871b | 3541 | tree decl = NULL_TREE; |
1ae57298 MM |
3542 | tree asmspec_tree; |
3543 | ||
0b410f0b JM |
3544 | for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed) |
3545 | { | |
3546 | if (B_IN_SCOPE (b, external_scope)) | |
3547 | { | |
3548 | decl = b->decl; | |
3549 | break; | |
3550 | } | |
3551 | } | |
51e29401 | 3552 | |
f91f41b2 | 3553 | if (decl) |
339a28b9 | 3554 | { |
e00dceaf | 3555 | if (TREE_CODE (decl) != FUNCTION_DECL) |
d8dd2f3a JJ |
3556 | return decl; |
3557 | ||
f75fbaf7 ZW |
3558 | /* FIXME: Objective-C has weird not-really-builtin functions |
3559 | which are supposed to be visible automatically. They wind up | |
3560 | in the external scope because they're pushed before the file | |
3561 | scope gets created. Catch this here and rebind them into the | |
3562 | file scope. */ | |
3d78e008 | 3563 | if (!fndecl_built_in_p (decl) && DECL_IS_BUILTIN (decl)) |
f75fbaf7 | 3564 | { |
9aaabf8a | 3565 | bind (functionid, decl, file_scope, |
b3f27c15 JJ |
3566 | /*invisible=*/false, /*nested=*/true, |
3567 | DECL_SOURCE_LOCATION (decl)); | |
f75fbaf7 ZW |
3568 | return decl; |
3569 | } | |
3570 | else | |
339a28b9 | 3571 | { |
0b410f0b | 3572 | tree newtype = default_function_type; |
e1b7793c ILT |
3573 | if (b->u.type) |
3574 | TREE_TYPE (decl) = b->u.type; | |
f75fbaf7 ZW |
3575 | /* Implicit declaration of a function already declared |
3576 | (somehow) in a different scope, or as a built-in. | |
3577 | If this is the first time this has happened, warn; | |
0b410f0b | 3578 | then recycle the old declaration but with the new type. */ |
f75fbaf7 ZW |
3579 | if (!C_DECL_IMPLICIT (decl)) |
3580 | { | |
30281de2 | 3581 | implicit_decl_warning (loc, functionid, decl); |
f75fbaf7 ZW |
3582 | C_DECL_IMPLICIT (decl) = 1; |
3583 | } | |
3d78e008 | 3584 | if (fndecl_built_in_p (decl)) |
9cbe78fb | 3585 | { |
0b410f0b JM |
3586 | newtype = build_type_attribute_variant (newtype, |
3587 | TYPE_ATTRIBUTES | |
3588 | (TREE_TYPE (decl))); | |
3589 | if (!comptypes (newtype, TREE_TYPE (decl))) | |
9cbe78fb | 3590 | { |
0382aaa0 MP |
3591 | bool warned = warning_at (loc, 0, "incompatible implicit " |
3592 | "declaration of built-in " | |
3593 | "function %qD", decl); | |
3594 | /* See if we can hint which header to include. */ | |
3595 | const char *header | |
3596 | = header_for_builtin_fn (DECL_FUNCTION_CODE (decl)); | |
3597 | if (header != NULL && warned) | |
eea77d1f DM |
3598 | { |
3599 | rich_location richloc (line_table, loc); | |
85204e23 | 3600 | maybe_add_include_fixit (&richloc, header, true); |
64a5912c DM |
3601 | inform (&richloc, |
3602 | "include %qs or provide a declaration of %qD", | |
3603 | header, decl); | |
eea77d1f | 3604 | } |
0b410f0b | 3605 | newtype = TREE_TYPE (decl); |
9cbe78fb JM |
3606 | } |
3607 | } | |
3608 | else | |
3609 | { | |
0b410f0b | 3610 | if (!comptypes (newtype, TREE_TYPE (decl))) |
9cbe78fb | 3611 | { |
097f82ec | 3612 | auto_diagnostic_group d; |
0382aaa0 MP |
3613 | error_at (loc, "incompatible implicit declaration of " |
3614 | "function %qD", decl); | |
71205d17 | 3615 | locate_old_decl (decl); |
9cbe78fb JM |
3616 | } |
3617 | } | |
e1b7793c | 3618 | b->u.type = TREE_TYPE (decl); |
0b410f0b | 3619 | TREE_TYPE (decl) = newtype; |
9aaabf8a | 3620 | bind (functionid, decl, current_scope, |
b3f27c15 JJ |
3621 | /*invisible=*/false, /*nested=*/true, |
3622 | DECL_SOURCE_LOCATION (decl)); | |
f75fbaf7 | 3623 | return decl; |
339a28b9 | 3624 | } |
339a28b9 | 3625 | } |
51e29401 | 3626 | |
339a28b9 | 3627 | /* Not seen before. */ |
c2255bc4 | 3628 | decl = build_decl (loc, FUNCTION_DECL, functionid, default_function_type); |
1394aabd | 3629 | DECL_EXTERNAL (decl) = 1; |
51e29401 | 3630 | TREE_PUBLIC (decl) = 1; |
339a28b9 | 3631 | C_DECL_IMPLICIT (decl) = 1; |
30281de2 | 3632 | implicit_decl_warning (loc, functionid, 0); |
1ae57298 MM |
3633 | asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL); |
3634 | if (asmspec_tree) | |
3635 | set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree)); | |
51e29401 | 3636 | |
14077d68 | 3637 | /* C89 says implicit declarations are in the innermost block. |
f458d1d5 | 3638 | So we record the decl in the standard fashion. */ |
339a28b9 | 3639 | decl = pushdecl (decl); |
51e29401 | 3640 | |
339a28b9 | 3641 | /* No need to call objc_check_decl here - it's a function type. */ |
0e6df31e | 3642 | rest_of_decl_compilation (decl, 0, 0); |
51e29401 | 3643 | |
14077d68 ZW |
3644 | /* Write a record describing this implicit function declaration |
3645 | to the prototypes file (if requested). */ | |
51e29401 RS |
3646 | gen_aux_info_record (decl, 0, 1, 0); |
3647 | ||
6431177a JM |
3648 | /* Possibly apply some default attributes to this implicit declaration. */ |
3649 | decl_attributes (&decl, NULL_TREE, 0); | |
3650 | ||
51e29401 RS |
3651 | return decl; |
3652 | } | |
3653 | ||
9cd51ef6 ZW |
3654 | /* Issue an error message for a reference to an undeclared variable |
3655 | ID, including a reference to a builtin outside of function-call | |
3656 | context. Establish a binding of the identifier to error_mark_node | |
3657 | in an appropriate scope, which will suppress further errors for the | |
766beb40 | 3658 | same identifier. The error message should be given location LOC. */ |
9cd51ef6 | 3659 | void |
c2255bc4 | 3660 | undeclared_variable (location_t loc, tree id) |
9cd51ef6 ZW |
3661 | { |
3662 | static bool already = false; | |
f91f41b2 | 3663 | struct c_scope *scope; |
9cd51ef6 | 3664 | |
097f82ec | 3665 | auto_diagnostic_group d; |
3fa8871b | 3666 | if (current_function_decl == NULL_TREE) |
9cd51ef6 | 3667 | { |
6c7a259b | 3668 | name_hint guessed_id = lookup_name_fuzzy (id, FUZZY_LOOKUP_NAME, loc); |
7e2de6df | 3669 | if (const char *suggestion = guessed_id.suggestion ()) |
1a4f11c8 DM |
3670 | { |
3671 | gcc_rich_location richloc (loc); | |
7e2de6df | 3672 | richloc.add_fixit_replace (suggestion); |
64a5912c DM |
3673 | error_at (&richloc, |
3674 | "%qE undeclared here (not in a function);" | |
3675 | " did you mean %qs?", | |
7e2de6df | 3676 | id, suggestion); |
1a4f11c8 DM |
3677 | } |
3678 | else | |
3679 | error_at (loc, "%qE undeclared here (not in a function)", id); | |
f91f41b2 | 3680 | scope = current_scope; |
9cd51ef6 ZW |
3681 | } |
3682 | else | |
3683 | { | |
90fbfdc3 | 3684 | if (!objc_diagnose_private_ivar (id)) |
1a4f11c8 | 3685 | { |
6c7a259b | 3686 | name_hint guessed_id = lookup_name_fuzzy (id, FUZZY_LOOKUP_NAME, loc); |
7e2de6df | 3687 | if (const char *suggestion = guessed_id.suggestion ()) |
1a4f11c8 DM |
3688 | { |
3689 | gcc_rich_location richloc (loc); | |
7e2de6df | 3690 | richloc.add_fixit_replace (suggestion); |
64a5912c DM |
3691 | error_at (&richloc, |
3692 | "%qE undeclared (first use in this function);" | |
3693 | " did you mean %qs?", | |
7e2de6df | 3694 | id, suggestion); |
1a4f11c8 DM |
3695 | } |
3696 | else | |
3697 | error_at (loc, "%qE undeclared (first use in this function)", id); | |
3698 | } | |
3f75a254 | 3699 | if (!already) |
9cd51ef6 | 3700 | { |
0b901e4c MLI |
3701 | inform (loc, "each undeclared identifier is reported only" |
3702 | " once for each function it appears in"); | |
9cd51ef6 ZW |
3703 | already = true; |
3704 | } | |
3705 | ||
f75fbaf7 | 3706 | /* If we are parsing old-style parameter decls, current_function_decl |
c22cacf3 | 3707 | will be nonnull but current_function_scope will be null. */ |
f75fbaf7 | 3708 | scope = current_function_scope ? current_function_scope : current_scope; |
9cd51ef6 | 3709 | } |
b3f27c15 JJ |
3710 | bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false, |
3711 | UNKNOWN_LOCATION); | |
9cd51ef6 | 3712 | } |
51e29401 | 3713 | \f |
14e33ee8 | 3714 | /* Subroutine of lookup_label, declare_label, define_label: construct a |
e1b7793c ILT |
3715 | LABEL_DECL with all the proper frills. Also create a struct |
3716 | c_label_vars initialized for the current scope. */ | |
14e33ee8 ZW |
3717 | |
3718 | static tree | |
e1b7793c ILT |
3719 | make_label (location_t location, tree name, bool defining, |
3720 | struct c_label_vars **p_label_vars) | |
14e33ee8 | 3721 | { |
c2255bc4 | 3722 | tree label = build_decl (location, LABEL_DECL, name, void_type_node); |
14e33ee8 | 3723 | DECL_CONTEXT (label) = current_function_decl; |
899ca90e | 3724 | SET_DECL_MODE (label, VOIDmode); |
14e33ee8 | 3725 | |
766090c2 | 3726 | c_label_vars *label_vars = ggc_alloc<c_label_vars> (); |
e1b7793c ILT |
3727 | label_vars->shadowed = NULL; |
3728 | set_spot_bindings (&label_vars->label_bindings, defining); | |
3729 | label_vars->decls_in_scope = make_tree_vector (); | |
9771b263 | 3730 | label_vars->gotos = NULL; |
e1b7793c ILT |
3731 | *p_label_vars = label_vars; |
3732 | ||
14e33ee8 ZW |
3733 | return label; |
3734 | } | |
3735 | ||
14e33ee8 | 3736 | /* Get the LABEL_DECL corresponding to identifier NAME as a label. |
51e29401 | 3737 | Create one if none exists so far for the current function. |
14e33ee8 ZW |
3738 | This is called when a label is used in a goto expression or |
3739 | has its address taken. */ | |
51e29401 RS |
3740 | |
3741 | tree | |
14e33ee8 | 3742 | lookup_label (tree name) |
51e29401 | 3743 | { |
14e33ee8 | 3744 | tree label; |
e1b7793c | 3745 | struct c_label_vars *label_vars; |
51e29401 | 3746 | |
c58e98c8 | 3747 | if (current_function_scope == 0) |
7d9795e5 | 3748 | { |
c51a1ba9 | 3749 | error ("label %qE referenced outside of any function", name); |
2f3bb934 | 3750 | return NULL_TREE; |
7d9795e5 RS |
3751 | } |
3752 | ||
14e33ee8 ZW |
3753 | /* Use a label already defined or ref'd with this name, but not if |
3754 | it is inherited from a containing function and wasn't declared | |
3755 | using __label__. */ | |
f75fbaf7 | 3756 | label = I_LABEL_DECL (name); |
14e33ee8 ZW |
3757 | if (label && (DECL_CONTEXT (label) == current_function_decl |
3758 | || C_DECLARED_LABEL_FLAG (label))) | |
51e29401 | 3759 | { |
14e33ee8 ZW |
3760 | /* If the label has only been declared, update its apparent |
3761 | location to point here, for better diagnostics if it | |
3762 | turns out not to have been defined. */ | |
e1b7793c | 3763 | if (DECL_INITIAL (label) == NULL_TREE) |
f31686a3 | 3764 | DECL_SOURCE_LOCATION (label) = input_location; |
14e33ee8 | 3765 | return label; |
51e29401 RS |
3766 | } |
3767 | ||
14e33ee8 | 3768 | /* No label binding for that identifier; make one. */ |
e1b7793c | 3769 | label = make_label (input_location, name, false, &label_vars); |
51e29401 | 3770 | |
14077d68 | 3771 | /* Ordinary labels go in the current function scope. */ |
e1b7793c ILT |
3772 | bind_label (name, label, current_function_scope, label_vars); |
3773 | ||
3774 | return label; | |
3775 | } | |
3776 | ||
3777 | /* Issue a warning about DECL for a goto statement at GOTO_LOC going | |
3778 | to LABEL. */ | |
3779 | ||
3780 | static void | |
3781 | warn_about_goto (location_t goto_loc, tree label, tree decl) | |
3782 | { | |
3783 | if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) | |
3784 | error_at (goto_loc, | |
3785 | "jump into scope of identifier with variably modified type"); | |
3786 | else | |
3787 | warning_at (goto_loc, OPT_Wjump_misses_init, | |
3788 | "jump skips variable initialization"); | |
3789 | inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label); | |
3790 | inform (DECL_SOURCE_LOCATION (decl), "%qD declared here", decl); | |
3791 | } | |
3792 | ||
3793 | /* Look up a label because of a goto statement. This is like | |
3794 | lookup_label, but also issues any appropriate warnings. */ | |
3795 | ||
3796 | tree | |
3797 | lookup_label_for_goto (location_t loc, tree name) | |
3798 | { | |
3799 | tree label; | |
3800 | struct c_label_vars *label_vars; | |
3801 | unsigned int ix; | |
3802 | tree decl; | |
3803 | ||
3804 | label = lookup_label (name); | |
3805 | if (label == NULL_TREE) | |
3806 | return NULL_TREE; | |
3807 | ||
3808 | /* If we are jumping to a different function, we can't issue any | |
3809 | useful warnings. */ | |
3810 | if (DECL_CONTEXT (label) != current_function_decl) | |
3811 | { | |
3812 | gcc_assert (C_DECLARED_LABEL_FLAG (label)); | |
3813 | return label; | |
3814 | } | |
3815 | ||
3816 | label_vars = I_LABEL_BINDING (name)->u.label; | |
3817 | ||
3818 | /* If the label has not yet been defined, then push this goto on a | |
3819 | list for possible later warnings. */ | |
3820 | if (label_vars->label_bindings.scope == NULL) | |
3821 | { | |
766090c2 | 3822 | c_goto_bindings *g = ggc_alloc<c_goto_bindings> (); |
e1b7793c | 3823 | |
e1b7793c ILT |
3824 | g->loc = loc; |
3825 | set_spot_bindings (&g->goto_bindings, true); | |
9771b263 | 3826 | vec_safe_push (label_vars->gotos, g); |
e1b7793c ILT |
3827 | return label; |
3828 | } | |
3829 | ||
3830 | /* If there are any decls in label_vars->decls_in_scope, then this | |
3831 | goto has missed the declaration of the decl. This happens for a | |
3832 | case like | |
3833 | int i = 1; | |
3834 | lab: | |
3835 | ... | |
3836 | goto lab; | |
3837 | Issue a warning or error. */ | |
9771b263 | 3838 | FOR_EACH_VEC_SAFE_ELT (label_vars->decls_in_scope, ix, decl) |
e1b7793c ILT |
3839 | warn_about_goto (loc, label, decl); |
3840 | ||
3841 | if (label_vars->label_bindings.left_stmt_expr) | |
3842 | { | |
3843 | error_at (loc, "jump into statement expression"); | |
3844 | inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label); | |
3845 | } | |
3846 | ||
14e33ee8 | 3847 | return label; |
51e29401 RS |
3848 | } |
3849 | ||
14e33ee8 ZW |
3850 | /* Make a label named NAME in the current function, shadowing silently |
3851 | any that may be inherited from containing functions or containing | |
3852 | scopes. This is called for __label__ declarations. */ | |
51e29401 | 3853 | |
51e29401 | 3854 | tree |
14e33ee8 | 3855 | declare_label (tree name) |
51e29401 | 3856 | { |
f75fbaf7 ZW |
3857 | struct c_binding *b = I_LABEL_BINDING (name); |
3858 | tree label; | |
e1b7793c | 3859 | struct c_label_vars *label_vars; |
51e29401 | 3860 | |
14e33ee8 ZW |
3861 | /* Check to make sure that the label hasn't already been declared |
3862 | at this scope */ | |
9aaabf8a | 3863 | if (b && B_IN_CURRENT_SCOPE (b)) |
f75fbaf7 | 3864 | { |
097f82ec | 3865 | auto_diagnostic_group d; |
c51a1ba9 | 3866 | error ("duplicate label declaration %qE", name); |
71205d17 | 3867 | locate_old_decl (b->decl); |
a784882b | 3868 | |
f75fbaf7 ZW |
3869 | /* Just use the previous declaration. */ |
3870 | return b->decl; | |
3871 | } | |
a784882b | 3872 | |
e1b7793c | 3873 | label = make_label (input_location, name, false, &label_vars); |
14e33ee8 | 3874 | C_DECLARED_LABEL_FLAG (label) = 1; |
51e29401 | 3875 | |
14e33ee8 | 3876 | /* Declared labels go in the current scope. */ |
e1b7793c ILT |
3877 | bind_label (name, label, current_scope, label_vars); |
3878 | ||
14e33ee8 | 3879 | return label; |
51e29401 RS |
3880 | } |
3881 | ||
e1b7793c ILT |
3882 | /* When we define a label, issue any appropriate warnings if there are |
3883 | any gotos earlier in the function which jump to this label. */ | |
3884 | ||
3885 | static void | |
3886 | check_earlier_gotos (tree label, struct c_label_vars* label_vars) | |
3887 | { | |
3888 | unsigned int ix; | |
3889 | struct c_goto_bindings *g; | |
3890 | ||
9771b263 | 3891 | FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g) |
e1b7793c ILT |
3892 | { |
3893 | struct c_binding *b; | |
3894 | struct c_scope *scope; | |
3895 | ||
3896 | /* We have a goto to this label. The goto is going forward. In | |
3897 | g->scope, the goto is going to skip any binding which was | |
3898 | defined after g->bindings_in_scope. */ | |
744f0946 | 3899 | if (g->goto_bindings.scope->has_jump_unsafe_decl) |
e1b7793c | 3900 | { |
744f0946 ILT |
3901 | for (b = g->goto_bindings.scope->bindings; |
3902 | b != g->goto_bindings.bindings_in_scope; | |
3903 | b = b->prev) | |
3904 | { | |
3905 | if (decl_jump_unsafe (b->decl)) | |
3906 | warn_about_goto (g->loc, label, b->decl); | |
3907 | } | |
e1b7793c ILT |
3908 | } |
3909 | ||
3910 | /* We also need to warn about decls defined in any scopes | |
3911 | between the scope of the label and the scope of the goto. */ | |
3912 | for (scope = label_vars->label_bindings.scope; | |
3913 | scope != g->goto_bindings.scope; | |
3914 | scope = scope->outer) | |
3915 | { | |
3916 | gcc_assert (scope != NULL); | |
744f0946 | 3917 | if (scope->has_jump_unsafe_decl) |
e1b7793c | 3918 | { |
744f0946 ILT |
3919 | if (scope == label_vars->label_bindings.scope) |
3920 | b = label_vars->label_bindings.bindings_in_scope; | |
3921 | else | |
3922 | b = scope->bindings; | |
3923 | for (; b != NULL; b = b->prev) | |
3924 | { | |
3925 | if (decl_jump_unsafe (b->decl)) | |
3926 | warn_about_goto (g->loc, label, b->decl); | |
3927 | } | |
e1b7793c ILT |
3928 | } |
3929 | } | |
3930 | ||
3931 | if (g->goto_bindings.stmt_exprs > 0) | |
3932 | { | |
3933 | error_at (g->loc, "jump into statement expression"); | |
3934 | inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", | |
3935 | label); | |
3936 | } | |
3937 | } | |
3938 | ||
3939 | /* Now that the label is defined, we will issue warnings about | |
3940 | subsequent gotos to this label when we see them. */ | |
9771b263 | 3941 | vec_safe_truncate (label_vars->gotos, 0); |
e1b7793c ILT |
3942 | label_vars->gotos = NULL; |
3943 | } | |
3944 | ||
51e29401 RS |
3945 | /* Define a label, specifying the location in the source file. |
3946 | Return the LABEL_DECL node for the label, if the definition is valid. | |
6574d78e | 3947 | Otherwise return NULL_TREE. */ |
51e29401 RS |
3948 | |
3949 | tree | |
5b030314 | 3950 | define_label (location_t location, tree name) |
51e29401 | 3951 | { |
14e33ee8 ZW |
3952 | /* Find any preexisting label with this name. It is an error |
3953 | if that label has already been defined in this function, or | |
3954 | if there is a containing function with a declared label with | |
3955 | the same name. */ | |
f75fbaf7 | 3956 | tree label = I_LABEL_DECL (name); |
14e33ee8 ZW |
3957 | |
3958 | if (label | |
3959 | && ((DECL_CONTEXT (label) == current_function_decl | |
3fa8871b | 3960 | && DECL_INITIAL (label) != NULL_TREE) |
14e33ee8 ZW |
3961 | || (DECL_CONTEXT (label) != current_function_decl |
3962 | && C_DECLARED_LABEL_FLAG (label)))) | |
51e29401 | 3963 | { |
097f82ec | 3964 | auto_diagnostic_group d; |
c2255bc4 | 3965 | error_at (location, "duplicate label %qD", label); |
71205d17 | 3966 | locate_old_decl (label); |
6574d78e | 3967 | return NULL_TREE; |
51e29401 | 3968 | } |
14e33ee8 | 3969 | else if (label && DECL_CONTEXT (label) == current_function_decl) |
51e29401 | 3970 | { |
e1b7793c ILT |
3971 | struct c_label_vars *label_vars = I_LABEL_BINDING (name)->u.label; |
3972 | ||
14e33ee8 ZW |
3973 | /* The label has been used or declared already in this function, |
3974 | but not defined. Update its location to point to this | |
3975 | definition. */ | |
f31686a3 | 3976 | DECL_SOURCE_LOCATION (label) = location; |
e1b7793c ILT |
3977 | set_spot_bindings (&label_vars->label_bindings, true); |
3978 | ||
3979 | /* Issue warnings as required about any goto statements from | |
3980 | earlier in the function. */ | |
3981 | check_earlier_gotos (label, label_vars); | |
51e29401 RS |
3982 | } |
3983 | else | |
3984 | { | |
e1b7793c ILT |
3985 | struct c_label_vars *label_vars; |
3986 | ||
14e33ee8 | 3987 | /* No label binding for that identifier; make one. */ |
e1b7793c | 3988 | label = make_label (location, name, true, &label_vars); |
14e33ee8 | 3989 | |
14077d68 | 3990 | /* Ordinary labels go in the current function scope. */ |
e1b7793c | 3991 | bind_label (name, label, current_function_scope, label_vars); |
51e29401 | 3992 | } |
14e33ee8 | 3993 | |
8400e75e | 3994 | if (!in_system_header_at (input_location) && lookup_name (name)) |
c2255bc4 AH |
3995 | warning_at (location, OPT_Wtraditional, |
3996 | "traditional C lacks a separate namespace " | |
3997 | "for labels, identifier %qE conflicts", name); | |
14e33ee8 ZW |
3998 | |
3999 | /* Mark label as having been defined. */ | |
4000 | DECL_INITIAL (label) = error_mark_node; | |
4001 | return label; | |
51e29401 | 4002 | } |
51e29401 | 4003 | \f |
e1b7793c ILT |
4004 | /* Get the bindings for a new switch statement. This is used to issue |
4005 | warnings as appropriate for jumps from the switch to case or | |
4006 | default labels. */ | |
4007 | ||
4008 | struct c_spot_bindings * | |
4009 | c_get_switch_bindings (void) | |
4010 | { | |
4011 | struct c_spot_bindings *switch_bindings; | |
4012 | ||
4013 | switch_bindings = XNEW (struct c_spot_bindings); | |
4014 | set_spot_bindings (switch_bindings, true); | |
4015 | return switch_bindings; | |
4016 | } | |
4017 | ||
4018 | void | |
4019 | c_release_switch_bindings (struct c_spot_bindings *bindings) | |
4020 | { | |
4021 | gcc_assert (bindings->stmt_exprs == 0 && !bindings->left_stmt_expr); | |
4022 | XDELETE (bindings); | |
4023 | } | |
4024 | ||
4025 | /* This is called at the point of a case or default label to issue | |
4026 | warnings about decls as needed. It returns true if it found an | |
4027 | error, not just a warning. */ | |
4028 | ||
4029 | bool | |
4030 | c_check_switch_jump_warnings (struct c_spot_bindings *switch_bindings, | |
4031 | location_t switch_loc, location_t case_loc) | |
4032 | { | |
4033 | bool saw_error; | |
4034 | struct c_scope *scope; | |
4035 | ||
4036 | saw_error = false; | |
4037 | for (scope = current_scope; | |
4038 | scope != switch_bindings->scope; | |
4039 | scope = scope->outer) | |
4040 | { | |
4041 | struct c_binding *b; | |
4042 | ||
4043 | gcc_assert (scope != NULL); | |
744f0946 ILT |
4044 | |
4045 | if (!scope->has_jump_unsafe_decl) | |
4046 | continue; | |
4047 | ||
e1b7793c ILT |
4048 | for (b = scope->bindings; b != NULL; b = b->prev) |
4049 | { | |
4050 | if (decl_jump_unsafe (b->decl)) | |
4051 | { | |
4052 | if (variably_modified_type_p (TREE_TYPE (b->decl), NULL_TREE)) | |
4053 | { | |
4054 | saw_error = true; | |
4055 | error_at (case_loc, | |
4056 | ("switch jumps into scope of identifier with " | |
4057 | "variably modified type")); | |
4058 | } | |
4059 | else | |
4060 | warning_at (case_loc, OPT_Wjump_misses_init, | |
4061 | "switch jumps over variable initialization"); | |
4062 | inform (switch_loc, "switch starts here"); | |
4063 | inform (DECL_SOURCE_LOCATION (b->decl), "%qD declared here", | |
4064 | b->decl); | |
4065 | } | |
4066 | } | |
4067 | } | |
4068 | ||
4069 | if (switch_bindings->stmt_exprs > 0) | |
4070 | { | |
4071 | saw_error = true; | |
4072 | error_at (case_loc, "switch jumps into statement expression"); | |
4073 | inform (switch_loc, "switch starts here"); | |
4074 | } | |
4075 | ||
4076 | return saw_error; | |
4077 | } | |
4078 | \f | |
51e29401 RS |
4079 | /* Given NAME, an IDENTIFIER_NODE, |
4080 | return the structure (or union or enum) definition for that name. | |
f8521984 | 4081 | If THISLEVEL_ONLY is nonzero, searches only the current_scope. |
51e29401 RS |
4082 | CODE says which kind of type the caller wants; |
4083 | it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE. | |
24b97832 ILT |
4084 | If PLOC is not NULL and this returns non-null, it sets *PLOC to the |
4085 | location where the tag was defined. | |
51e29401 RS |
4086 | If the wrong kind of type is found, an error is reported. */ |
4087 | ||
4088 | static tree | |
2f3bb934 | 4089 | lookup_tag (enum tree_code code, tree name, bool thislevel_only, |
24b97832 | 4090 | location_t *ploc) |
51e29401 | 4091 | { |
f75fbaf7 | 4092 | struct c_binding *b = I_TAG_BINDING (name); |
2f3bb934 | 4093 | bool thislevel = false; |
51e29401 | 4094 | |
f75fbaf7 | 4095 | if (!b || !b->decl) |
2f3bb934 | 4096 | return NULL_TREE; |
339a28b9 ZW |
4097 | |
4098 | /* We only care about whether it's in this level if | |
4099 | thislevel_only was set or it might be a type clash. */ | |
f75fbaf7 ZW |
4100 | if (thislevel_only || TREE_CODE (b->decl) != code) |
4101 | { | |
4102 | /* For our purposes, a tag in the external scope is the same as | |
4103 | a tag in the file scope. (Primarily relevant to Objective-C | |
4104 | and its builtin structure tags, which get pushed before the | |
118a3a8b | 4105 | file scope is created.) */ |
9aaabf8a ZW |
4106 | if (B_IN_CURRENT_SCOPE (b) |
4107 | || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b))) | |
2f3bb934 | 4108 | thislevel = true; |
51e29401 | 4109 | } |
339a28b9 ZW |
4110 | |
4111 | if (thislevel_only && !thislevel) | |
2f3bb934 | 4112 | return NULL_TREE; |
339a28b9 | 4113 | |
f75fbaf7 | 4114 | if (TREE_CODE (b->decl) != code) |
339a28b9 ZW |
4115 | { |
4116 | /* Definition isn't the kind we were looking for. */ | |
4117 | pending_invalid_xref = name; | |
070588f0 | 4118 | pending_invalid_xref_location = input_location; |
339a28b9 ZW |
4119 | |
4120 | /* If in the same binding level as a declaration as a tag | |
4121 | of a different type, this must not be allowed to | |
4122 | shadow that tag, so give the error immediately. | |
4123 | (For example, "struct foo; union foo;" is invalid.) */ | |
4124 | if (thislevel) | |
4125 | pending_xref_error (); | |
4126 | } | |
24b97832 ILT |
4127 | |
4128 | if (ploc != NULL) | |
4129 | *ploc = b->locus; | |
4130 | ||
f75fbaf7 | 4131 | return b->decl; |
51e29401 RS |
4132 | } |
4133 | ||
0e36f5c7 MP |
4134 | /* Return true if a definition exists for NAME with code CODE. */ |
4135 | ||
4136 | bool | |
4137 | tag_exists_p (enum tree_code code, tree name) | |
4138 | { | |
4139 | struct c_binding *b = I_TAG_BINDING (name); | |
4140 | ||
4141 | if (b == NULL || b->decl == NULL_TREE) | |
4142 | return false; | |
4143 | return TREE_CODE (b->decl) == code; | |
4144 | } | |
4145 | ||
51e29401 RS |
4146 | /* Print an error message now |
4147 | for a recent invalid struct, union or enum cross reference. | |
4148 | We don't print them immediately because they are not invalid | |
4149 | when used in the `struct foo;' construct for shadowing. */ | |
4150 | ||
4151 | void | |
35b1a6fa | 4152 | pending_xref_error (void) |
51e29401 | 4153 | { |
3fa8871b | 4154 | if (pending_invalid_xref != NULL_TREE) |
fab922b1 MLI |
4155 | error_at (pending_invalid_xref_location, "%qE defined as wrong kind of tag", |
4156 | pending_invalid_xref); | |
3fa8871b | 4157 | pending_invalid_xref = NULL_TREE; |
51e29401 RS |
4158 | } |
4159 | ||
51e29401 | 4160 | \f |
f8521984 | 4161 | /* Look up NAME in the current scope and its superiors |
51e29401 RS |
4162 | in the namespace of variables, functions and typedefs. |
4163 | Return a ..._DECL node of some kind representing its definition, | |
6574d78e | 4164 | or return NULL_TREE if it is undefined. */ |
51e29401 RS |
4165 | |
4166 | tree | |
35b1a6fa | 4167 | lookup_name (tree name) |
51e29401 | 4168 | { |
f75fbaf7 | 4169 | struct c_binding *b = I_SYMBOL_BINDING (name); |
9aaabf8a | 4170 | if (b && !b->invisible) |
3797cb21 DS |
4171 | { |
4172 | maybe_record_typedef_use (b->decl); | |
4173 | return b->decl; | |
4174 | } | |
2f3bb934 | 4175 | return NULL_TREE; |
51e29401 RS |
4176 | } |
4177 | ||
f75fbaf7 | 4178 | /* Similar to `lookup_name' but look only at the indicated scope. */ |
51e29401 | 4179 | |
339a28b9 | 4180 | static tree |
f75fbaf7 | 4181 | lookup_name_in_scope (tree name, struct c_scope *scope) |
51e29401 | 4182 | { |
f75fbaf7 | 4183 | struct c_binding *b; |
339a28b9 | 4184 | |
f75fbaf7 | 4185 | for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed) |
9aaabf8a | 4186 | if (B_IN_SCOPE (b, scope)) |
f75fbaf7 | 4187 | return b->decl; |
2f3bb934 | 4188 | return NULL_TREE; |
51e29401 | 4189 | } |
1a4f11c8 | 4190 | |
1a4f11c8 DM |
4191 | /* Look for the closest match for NAME within the currently valid |
4192 | scopes. | |
4193 | ||
4194 | This finds the identifier with the lowest Levenshtein distance to | |
4195 | NAME. If there are multiple candidates with equal minimal distance, | |
4196 | the first one found is returned. Scopes are searched from innermost | |
4197 | outwards, and within a scope in reverse order of declaration, thus | |
4198 | benefiting candidates "near" to the current scope. | |
4199 | ||
4200 | The function also looks for similar macro names to NAME, since a | |
4201 | misspelled macro name will not be expanded, and hence looks like an | |
4202 | identifier to the C frontend. | |
4203 | ||
4204 | It also looks for start_typename keywords, to detect "singed" vs "signed" | |
b1212255 DM |
4205 | typos. |
4206 | ||
4207 | Use LOC for any deferred diagnostics. */ | |
1a4f11c8 | 4208 | |
6c7a259b | 4209 | name_hint |
b1212255 | 4210 | lookup_name_fuzzy (tree name, enum lookup_name_fuzzy_kind kind, location_t loc) |
1a4f11c8 DM |
4211 | { |
4212 | gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE); | |
4213 | ||
b1212255 DM |
4214 | /* First, try some well-known names in the C standard library, in case |
4215 | the user forgot a #include. */ | |
26edace6 DM |
4216 | const char *header_hint |
4217 | = get_c_stdlib_header_for_name (IDENTIFIER_POINTER (name)); | |
4218 | ||
b1212255 DM |
4219 | if (header_hint) |
4220 | return name_hint (NULL, | |
4221 | new suggest_missing_header (loc, | |
4222 | IDENTIFIER_POINTER (name), | |
4223 | header_hint)); | |
4224 | ||
c79144f8 DM |
4225 | /* Only suggest names reserved for the implementation if NAME begins |
4226 | with an underscore. */ | |
4227 | bool consider_implementation_names = (IDENTIFIER_POINTER (name)[0] == '_'); | |
4228 | ||
1a4f11c8 DM |
4229 | best_match<tree, tree> bm (name); |
4230 | ||
4231 | /* Look within currently valid scopes. */ | |
4232 | for (c_scope *scope = current_scope; scope; scope = scope->outer) | |
4233 | for (c_binding *binding = scope->bindings; binding; binding = binding->prev) | |
4234 | { | |
dd36b877 | 4235 | if (!binding->id || binding->invisible) |
1a4f11c8 | 4236 | continue; |
d4300cc6 DM |
4237 | if (binding->decl == error_mark_node) |
4238 | continue; | |
1a4f11c8 DM |
4239 | /* Don't use bindings from implicitly declared functions, |
4240 | as they were likely misspellings themselves. */ | |
4241 | if (TREE_CODE (binding->decl) == FUNCTION_DECL) | |
4242 | if (C_DECL_IMPLICIT (binding->decl)) | |
4243 | continue; | |
c79144f8 DM |
4244 | /* Don't suggest names that are reserved for use by the |
4245 | implementation, unless NAME began with an underscore. */ | |
4246 | if (!consider_implementation_names) | |
4247 | { | |
4248 | const char *suggestion_str = IDENTIFIER_POINTER (binding->id); | |
4249 | if (name_reserved_for_implementation_p (suggestion_str)) | |
4250 | continue; | |
4251 | } | |
ddbbcb19 JJ |
4252 | switch (kind) |
4253 | { | |
4254 | case FUZZY_LOOKUP_TYPENAME: | |
4255 | if (TREE_CODE (binding->decl) != TYPE_DECL) | |
4256 | continue; | |
4257 | break; | |
4258 | ||
4259 | case FUZZY_LOOKUP_FUNCTION_NAME: | |
4260 | if (TREE_CODE (binding->decl) != FUNCTION_DECL) | |
4261 | { | |
4262 | /* Allow function pointers. */ | |
4263 | if ((VAR_P (binding->decl) | |
4264 | || TREE_CODE (binding->decl) == PARM_DECL) | |
4265 | && TREE_CODE (TREE_TYPE (binding->decl)) == POINTER_TYPE | |
4266 | && (TREE_CODE (TREE_TYPE (TREE_TYPE (binding->decl))) | |
4267 | == FUNCTION_TYPE)) | |
4268 | break; | |
4269 | continue; | |
4270 | } | |
4271 | break; | |
4272 | ||
4273 | default: | |
4274 | break; | |
4275 | } | |
1a4f11c8 DM |
4276 | bm.consider (binding->id); |
4277 | } | |
4278 | ||
4279 | /* Consider macros: if the user misspelled a macro name e.g. "SOME_MACRO" | |
4280 | as: | |
4281 | x = SOME_OTHER_MACRO (y); | |
4282 | then "SOME_OTHER_MACRO" will survive to the frontend and show up | |
4283 | as a misspelled identifier. | |
4284 | ||
4285 | Use the best distance so far so that a candidate is only set if | |
4286 | a macro is better than anything so far. This allows early rejection | |
4287 | (without calculating the edit distance) of macro names that must have | |
4288 | distance >= bm.get_best_distance (), and means that we only get a | |
4289 | non-NULL result for best_macro_match if it's better than any of | |
4290 | the identifiers already checked, which avoids needless creation | |
4291 | of identifiers for macro hashnodes. */ | |
7c8f7eaa | 4292 | best_macro_match bmm (name, bm.get_best_distance (), parse_in); |
1a4f11c8 DM |
4293 | cpp_hashnode *best_macro = bmm.get_best_meaningful_candidate (); |
4294 | /* If a macro is the closest so far to NAME, use it, creating an | |
4295 | identifier tree node for it. */ | |
4296 | if (best_macro) | |
4297 | { | |
4298 | const char *id = (const char *)best_macro->ident.str; | |
4299 | tree macro_as_identifier | |
4300 | = get_identifier_with_length (id, best_macro->ident.len); | |
4301 | bm.set_best_so_far (macro_as_identifier, | |
4302 | bmm.get_best_distance (), | |
4303 | bmm.get_best_candidate_length ()); | |
4304 | } | |
4305 | ||
4306 | /* Try the "start_typename" keywords to detect | |
4307 | "singed" vs "signed" typos. */ | |
4308 | if (kind == FUZZY_LOOKUP_TYPENAME) | |
4309 | { | |
4310 | for (unsigned i = 0; i < num_c_common_reswords; i++) | |
4311 | { | |
4312 | const c_common_resword *resword = &c_common_reswords[i]; | |
4313 | if (!c_keyword_starts_typename (resword->rid)) | |
4314 | continue; | |
4315 | tree resword_identifier = ridpointers [resword->rid]; | |
4316 | if (!resword_identifier) | |
4317 | continue; | |
4318 | gcc_assert (TREE_CODE (resword_identifier) == IDENTIFIER_NODE); | |
4319 | bm.consider (resword_identifier); | |
4320 | } | |
4321 | } | |
4322 | ||
de6a69ee DM |
4323 | tree best = bm.get_best_meaningful_candidate (); |
4324 | if (best) | |
6c7a259b | 4325 | return name_hint (IDENTIFIER_POINTER (best), NULL); |
de6a69ee | 4326 | else |
6c7a259b | 4327 | return name_hint (NULL, NULL); |
1a4f11c8 DM |
4328 | } |
4329 | ||
51e29401 RS |
4330 | \f |
4331 | /* Create the predefined scalar types of C, | |
0f41302f | 4332 | and some nodes representing standard constants (0, 1, (void *) 0). |
f8521984 | 4333 | Initialize the global scope. |
51e29401 RS |
4334 | Make definitions for built-in primitive functions. */ |
4335 | ||
4336 | void | |
35b1a6fa | 4337 | c_init_decl_processing (void) |
51e29401 | 4338 | { |
4714db5a | 4339 | location_t save_loc = input_location; |
e13e48e7 | 4340 | |
27bf414c | 4341 | /* Initialize reserved words for parser. */ |
f5e99456 NB |
4342 | c_parse_init (); |
4343 | ||
3fa8871b | 4344 | current_function_decl = NULL_TREE; |
6645c3fa | 4345 | |
bc4b653b JM |
4346 | gcc_obstack_init (&parser_obstack); |
4347 | ||
f75fbaf7 ZW |
4348 | /* Make the externals scope. */ |
4349 | push_scope (); | |
4350 | external_scope = current_scope; | |
14077d68 | 4351 | |
e3091a5f R |
4352 | /* Declarations from c_common_nodes_and_builtins must not be associated |
4353 | with this input file, lest we get differences between using and not | |
4354 | using preprocessed headers. */ | |
3c20847b | 4355 | input_location = BUILTINS_LOCATION; |
51e29401 | 4356 | |
eaa7c03f | 4357 | c_common_nodes_and_builtins (); |
51e29401 | 4358 | |
de7df9eb JM |
4359 | /* In C, comparisons and TRUTH_* expressions have type int. */ |
4360 | truthvalue_type_node = integer_type_node; | |
4361 | truthvalue_true_node = integer_one_node; | |
4362 | truthvalue_false_node = integer_zero_node; | |
4363 | ||
4364 | /* Even in C99, which has a real boolean type. */ | |
c2255bc4 | 4365 | pushdecl (build_decl (UNKNOWN_LOCATION, TYPE_DECL, get_identifier ("_Bool"), |
de7df9eb | 4366 | boolean_type_node)); |
19552aa5 | 4367 | |
4714db5a | 4368 | input_location = save_loc; |
e3091a5f | 4369 | |
2ce07e2d | 4370 | make_fname_decl = c_make_fname_decl; |
0ba8a114 | 4371 | start_fname_decls (); |
51e29401 RS |
4372 | } |
4373 | ||
c2255bc4 AH |
4374 | /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to |
4375 | give the decl, NAME is the initialization string and TYPE_DEP | |
4376 | indicates whether NAME depended on the type of the function. As we | |
4377 | don't yet implement delayed emission of static data, we mark the | |
4378 | decl as emitted so it is not placed in the output. Anything using | |
4379 | it must therefore pull out the STRING_CST initializer directly. | |
4380 | FIXME. */ | |
2ce07e2d NS |
4381 | |
4382 | static tree | |
c2255bc4 | 4383 | c_make_fname_decl (location_t loc, tree id, int type_dep) |
2ce07e2d | 4384 | { |
0ba8a114 | 4385 | const char *name = fname_as_string (type_dep); |
2ce07e2d NS |
4386 | tree decl, type, init; |
4387 | size_t length = strlen (name); | |
4388 | ||
46df2823 JM |
4389 | type = build_array_type (char_type_node, |
4390 | build_index_type (size_int (length))); | |
4391 | type = c_build_qualified_type (type, TYPE_QUAL_CONST); | |
2ce07e2d | 4392 | |
c2255bc4 | 4393 | decl = build_decl (loc, VAR_DECL, id, type); |
35b1a6fa | 4394 | |
2ce07e2d NS |
4395 | TREE_STATIC (decl) = 1; |
4396 | TREE_READONLY (decl) = 1; | |
2ce07e2d | 4397 | DECL_ARTIFICIAL (decl) = 1; |
35b1a6fa | 4398 | |
2ce07e2d | 4399 | init = build_string (length + 1, name); |
b1d5455a | 4400 | free (CONST_CAST (char *, name)); |
2ce07e2d NS |
4401 | TREE_TYPE (init) = type; |
4402 | DECL_INITIAL (decl) = init; | |
0ba8a114 NS |
4403 | |
4404 | TREE_USED (decl) = 1; | |
6cce57b0 | 4405 | |
1a4259dc JH |
4406 | if (current_function_decl |
4407 | /* For invalid programs like this: | |
b8698a0f | 4408 | |
1a4259dc JH |
4409 | void foo() |
4410 | const char* p = __FUNCTION__; | |
b8698a0f | 4411 | |
1a4259dc JH |
4412 | the __FUNCTION__ is believed to appear in K&R style function |
4413 | parameter declarator. In that case we still don't have | |
4414 | function_scope. */ | |
95efe6b6 | 4415 | && current_function_scope) |
f91f41b2 ZW |
4416 | { |
4417 | DECL_CONTEXT (decl) = current_function_decl; | |
9aaabf8a | 4418 | bind (id, decl, current_function_scope, |
b3f27c15 | 4419 | /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION); |
f91f41b2 | 4420 | } |
339a28b9 | 4421 | |
c2255bc4 | 4422 | finish_decl (decl, loc, init, NULL_TREE, NULL_TREE); |
6645c3fa | 4423 | |
2ce07e2d NS |
4424 | return decl; |
4425 | } | |
4426 | ||
929f3671 | 4427 | tree |
c79efc4d | 4428 | c_builtin_function (tree decl) |
51e29401 | 4429 | { |
c79efc4d RÁE |
4430 | tree type = TREE_TYPE (decl); |
4431 | tree id = DECL_NAME (decl); | |
4432 | ||
4433 | const char *name = IDENTIFIER_POINTER (id); | |
f4da8dce | 4434 | C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type); |
26db82d8 | 4435 | |
f75fbaf7 | 4436 | /* Should never be called on a symbol with a preexisting meaning. */ |
366de0ce | 4437 | gcc_assert (!I_SYMBOL_BINDING (id)); |
f75fbaf7 | 4438 | |
b3f27c15 JJ |
4439 | bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false, |
4440 | UNKNOWN_LOCATION); | |
f75fbaf7 | 4441 | |
5779e713 MM |
4442 | /* Builtins in the implementation namespace are made visible without |
4443 | needing to be explicitly declared. See push_file_scope. */ | |
4444 | if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1]))) | |
4445 | { | |
910ad8de | 4446 | DECL_CHAIN (decl) = visible_builtins; |
5779e713 MM |
4447 | visible_builtins = decl; |
4448 | } | |
4449 | ||
4450 | return decl; | |
4451 | } | |
4452 | ||
4453 | tree | |
4454 | c_builtin_function_ext_scope (tree decl) | |
4455 | { | |
4456 | tree type = TREE_TYPE (decl); | |
4457 | tree id = DECL_NAME (decl); | |
4458 | ||
4459 | const char *name = IDENTIFIER_POINTER (id); | |
f4da8dce | 4460 | C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type); |
5779e713 | 4461 | |
0136f8f0 AH |
4462 | if (external_scope) |
4463 | bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false, | |
4464 | UNKNOWN_LOCATION); | |
5779e713 | 4465 | |
f75fbaf7 ZW |
4466 | /* Builtins in the implementation namespace are made visible without |
4467 | needing to be explicitly declared. See push_file_scope. */ | |
4468 | if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1]))) | |
4469 | { | |
910ad8de | 4470 | DECL_CHAIN (decl) = visible_builtins; |
f75fbaf7 ZW |
4471 | visible_builtins = decl; |
4472 | } | |
51e29401 RS |
4473 | |
4474 | return decl; | |
4475 | } | |
4476 | \f | |
4477 | /* Called when a declaration is seen that contains no names to declare. | |
4478 | If its type is a reference to a structure, union or enum inherited | |
4479 | from a containing scope, shadow that tag name for the current scope | |
4480 | with a forward reference. | |
4481 | If its type defines a new named structure or union | |
4482 | or defines an enum, it is valid but we need not do anything here. | |
4483 | Otherwise, it is an error. */ | |
4484 | ||
4485 | void | |
deb176fa | 4486 | shadow_tag (const struct c_declspecs *declspecs) |
9282f2f9 RS |
4487 | { |
4488 | shadow_tag_warned (declspecs, 0); | |
4489 | } | |
4490 | ||
0e6df31e GK |
4491 | /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning, |
4492 | but no pedwarn. */ | |
9282f2f9 | 4493 | void |
deb176fa | 4494 | shadow_tag_warned (const struct c_declspecs *declspecs, int warned) |
51e29401 | 4495 | { |
deb176fa | 4496 | bool found_tag = false; |
51e29401 | 4497 | |
98c3a782 | 4498 | if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p) |
51e29401 | 4499 | { |
deb176fa | 4500 | tree value = declspecs->type; |
b3694847 | 4501 | enum tree_code code = TREE_CODE (value); |
51e29401 RS |
4502 | |
4503 | if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE) | |
4504 | /* Used to test also that TYPE_SIZE (value) != 0. | |
4505 | That caused warning for `struct foo;' at top level in the file. */ | |
4506 | { | |
339a28b9 | 4507 | tree name = TYPE_NAME (value); |
b3694847 | 4508 | tree t; |
51e29401 | 4509 | |
deb176fa | 4510 | found_tag = true; |
51e29401 | 4511 | |
da377db9 JM |
4512 | if (declspecs->restrict_p) |
4513 | { | |
4514 | error ("invalid use of %<restrict%>"); | |
4515 | warned = 1; | |
4516 | } | |
4517 | ||
3fa8871b | 4518 | if (name == NULL_TREE) |
51e29401 | 4519 | { |
773edaef RK |
4520 | if (warned != 1 && code != ENUMERAL_TYPE) |
4521 | /* Empty unnamed enum OK */ | |
51e29401 | 4522 | { |
509c9d60 MLI |
4523 | pedwarn (input_location, 0, |
4524 | "unnamed struct/union that defines no instances"); | |
51e29401 RS |
4525 | warned = 1; |
4526 | } | |
4527 | } | |
9e5b2115 PB |
4528 | else if (declspecs->typespec_kind != ctsk_tagdef |
4529 | && declspecs->typespec_kind != ctsk_tagfirstref | |
81da229b JM |
4530 | && declspecs->storage_class != csc_none) |
4531 | { | |
4532 | if (warned != 1) | |
509c9d60 MLI |
4533 | pedwarn (input_location, 0, |
4534 | "empty declaration with storage class specifier " | |
4535 | "does not redeclare tag"); | |
81da229b JM |
4536 | warned = 1; |
4537 | pending_xref_error (); | |
4538 | } | |
9e5b2115 PB |
4539 | else if (declspecs->typespec_kind != ctsk_tagdef |
4540 | && declspecs->typespec_kind != ctsk_tagfirstref | |
81da229b JM |
4541 | && (declspecs->const_p |
4542 | || declspecs->volatile_p | |
267bac10 | 4543 | || declspecs->atomic_p |
36c5e70a BE |
4544 | || declspecs->restrict_p |
4545 | || declspecs->address_space)) | |
81da229b JM |
4546 | { |
4547 | if (warned != 1) | |
509c9d60 MLI |
4548 | pedwarn (input_location, 0, |
4549 | "empty declaration with type qualifier " | |
fcf73884 | 4550 | "does not redeclare tag"); |
81da229b JM |
4551 | warned = 1; |
4552 | pending_xref_error (); | |
4553 | } | |
d19fa6b5 JM |
4554 | else if (declspecs->typespec_kind != ctsk_tagdef |
4555 | && declspecs->typespec_kind != ctsk_tagfirstref | |
4556 | && declspecs->alignas_p) | |
4557 | { | |
4558 | if (warned != 1) | |
4559 | pedwarn (input_location, 0, | |
4560 | "empty declaration with %<_Alignas%> " | |
4561 | "does not redeclare tag"); | |
4562 | warned = 1; | |
4563 | pending_xref_error (); | |
4564 | } | |
51e29401 RS |
4565 | else |
4566 | { | |
3fa8871b | 4567 | pending_invalid_xref = NULL_TREE; |
2f3bb934 | 4568 | t = lookup_tag (code, name, true, NULL); |
51e29401 | 4569 | |
2f3bb934 | 4570 | if (t == NULL_TREE) |
51e29401 RS |
4571 | { |
4572 | t = make_node (code); | |
c2255bc4 | 4573 | pushtag (input_location, name, t); |
51e29401 RS |
4574 | } |
4575 | } | |
4576 | } | |
4577 | else | |
4578 | { | |
8400e75e | 4579 | if (warned != 1 && !in_system_header_at (input_location)) |
773edaef | 4580 | { |
509c9d60 MLI |
4581 | pedwarn (input_location, 0, |
4582 | "useless type name in empty declaration"); | |
deb176fa | 4583 | warned = 1; |
773edaef | 4584 | } |
51e29401 RS |
4585 | } |
4586 | } | |
8400e75e DM |
4587 | else if (warned != 1 && !in_system_header_at (input_location) |
4588 | && declspecs->typedef_p) | |
deb176fa | 4589 | { |
509c9d60 | 4590 | pedwarn (input_location, 0, "useless type name in empty declaration"); |
deb176fa JM |
4591 | warned = 1; |
4592 | } | |
4593 | ||
3fa8871b | 4594 | pending_invalid_xref = NULL_TREE; |
81da229b | 4595 | |
9a26d6ee JM |
4596 | if (declspecs->inline_p) |
4597 | { | |
4598 | error ("%<inline%> in empty declaration"); | |
4599 | warned = 1; | |
4600 | } | |
4601 | ||
bbceee64 JM |
4602 | if (declspecs->noreturn_p) |
4603 | { | |
4604 | error ("%<_Noreturn%> in empty declaration"); | |
4605 | warned = 1; | |
4606 | } | |
4607 | ||
9a26d6ee JM |
4608 | if (current_scope == file_scope && declspecs->storage_class == csc_auto) |
4609 | { | |
4610 | error ("%<auto%> in file-scope empty declaration"); | |
4611 | warned = 1; | |
4612 | } | |
4613 | ||
4614 | if (current_scope == file_scope && declspecs->storage_class == csc_register) | |
4615 | { | |
4616 | error ("%<register%> in file-scope empty declaration"); | |
4617 | warned = 1; | |
4618 | } | |
4619 | ||
8400e75e DM |
4620 | if (!warned && !in_system_header_at (input_location) |
4621 | && declspecs->storage_class != csc_none) | |
9a26d6ee | 4622 | { |
d4ee4d25 | 4623 | warning (0, "useless storage class specifier in empty declaration"); |
9a26d6ee JM |
4624 | warned = 2; |
4625 | } | |
4626 | ||
8400e75e | 4627 | if (!warned && !in_system_header_at (input_location) && declspecs->thread_p) |
9a26d6ee | 4628 | { |
582d9b50 JM |
4629 | warning (0, "useless %qs in empty declaration", |
4630 | declspecs->thread_gnu_p ? "__thread" : "_Thread_local"); | |
9a26d6ee JM |
4631 | warned = 2; |
4632 | } | |
4633 | ||
8400e75e DM |
4634 | if (!warned |
4635 | && !in_system_header_at (input_location) | |
4636 | && (declspecs->const_p | |
4637 | || declspecs->volatile_p | |
4638 | || declspecs->atomic_p | |
4639 | || declspecs->restrict_p | |
4640 | || declspecs->address_space)) | |
3b53cddc | 4641 | { |
d4ee4d25 | 4642 | warning (0, "useless type qualifier in empty declaration"); |
3b53cddc JM |
4643 | warned = 2; |
4644 | } | |
4645 | ||
8400e75e DM |
4646 | if (!warned && !in_system_header_at (input_location) |
4647 | && declspecs->alignas_p) | |
d19fa6b5 JM |
4648 | { |
4649 | warning (0, "useless %<_Alignas%> in empty declaration"); | |
4650 | warned = 2; | |
4651 | } | |
4652 | ||
773edaef | 4653 | if (warned != 1) |
51e29401 | 4654 | { |
deb176fa | 4655 | if (!found_tag) |
509c9d60 | 4656 | pedwarn (input_location, 0, "empty declaration"); |
51e29401 RS |
4657 | } |
4658 | } | |
4659 | \f | |
3b53cddc JM |
4660 | |
4661 | /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_* | |
4662 | bits. SPECS represents declaration specifiers that the grammar | |
4663 | only permits to contain type qualifiers and attributes. */ | |
4664 | ||
4665 | int | |
4666 | quals_from_declspecs (const struct c_declspecs *specs) | |
4667 | { | |
4668 | int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0) | |
4669 | | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0) | |
36c5e70a | 4670 | | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0) |
267bac10 | 4671 | | (specs->atomic_p ? TYPE_QUAL_ATOMIC : 0) |
36c5e70a | 4672 | | (ENCODE_QUAL_ADDR_SPACE (specs->address_space))); |
3b53cddc JM |
4673 | gcc_assert (!specs->type |
4674 | && !specs->decl_attr | |
98c3a782 | 4675 | && specs->typespec_word == cts_none |
3b53cddc JM |
4676 | && specs->storage_class == csc_none |
4677 | && !specs->typedef_p | |
98c3a782 | 4678 | && !specs->explicit_signed_p |
3b53cddc | 4679 | && !specs->deprecated_p |
98c3a782 | 4680 | && !specs->long_p |
3b53cddc | 4681 | && !specs->long_long_p |
98c3a782 JM |
4682 | && !specs->short_p |
4683 | && !specs->signed_p | |
4684 | && !specs->unsigned_p | |
4685 | && !specs->complex_p | |
3b53cddc | 4686 | && !specs->inline_p |
bbceee64 | 4687 | && !specs->noreturn_p |
3b53cddc JM |
4688 | && !specs->thread_p); |
4689 | return quals; | |
4690 | } | |
4691 | ||
c2255bc4 AH |
4692 | /* Construct an array declarator. LOC is the location of the |
4693 | beginning of the array (usually the opening brace). EXPR is the | |
4694 | expression inside [], or NULL_TREE. QUALS are the type qualifiers | |
4695 | inside the [] (to be applied to the pointer to which a parameter | |
4696 | array is converted). STATIC_P is true if "static" is inside the | |
4697 | [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a | |
4698 | VLA of unspecified length which is nevertheless a complete type, | |
4699 | false otherwise. The field for the contained declarator is left to | |
4700 | be filled in by set_array_declarator_inner. */ | |
0e03329a | 4701 | |
f8893e47 | 4702 | struct c_declarator * |
c2255bc4 AH |
4703 | build_array_declarator (location_t loc, |
4704 | tree expr, struct c_declspecs *quals, bool static_p, | |
60919bce | 4705 | bool vla_unspec_p) |
0e03329a | 4706 | { |
f8893e47 JM |
4707 | struct c_declarator *declarator = XOBNEW (&parser_obstack, |
4708 | struct c_declarator); | |
c2255bc4 | 4709 | declarator->id_loc = loc; |
f8893e47 JM |
4710 | declarator->kind = cdk_array; |
4711 | declarator->declarator = 0; | |
4712 | declarator->u.array.dimen = expr; | |
3b53cddc JM |
4713 | if (quals) |
4714 | { | |
4715 | declarator->u.array.attrs = quals->attrs; | |
4716 | declarator->u.array.quals = quals_from_declspecs (quals); | |
4717 | } | |
4718 | else | |
4719 | { | |
4720 | declarator->u.array.attrs = NULL_TREE; | |
4721 | declarator->u.array.quals = 0; | |
4722 | } | |
f8893e47 JM |
4723 | declarator->u.array.static_p = static_p; |
4724 | declarator->u.array.vla_unspec_p = vla_unspec_p; | |
f3bede71 MP |
4725 | if (static_p || quals != NULL) |
4726 | pedwarn_c90 (loc, OPT_Wpedantic, | |
509c9d60 | 4727 | "ISO C90 does not support %<static%> or type " |
bda67431 | 4728 | "qualifiers in parameter array declarators"); |
f3bede71 MP |
4729 | if (vla_unspec_p) |
4730 | pedwarn_c90 (loc, OPT_Wpedantic, | |
509c9d60 | 4731 | "ISO C90 does not support %<[*]%> array declarators"); |
0e03329a | 4732 | if (vla_unspec_p) |
52ffd86e MS |
4733 | { |
4734 | if (!current_scope->parm_flag) | |
4735 | { | |
4736 | /* C99 6.7.5.2p4 */ | |
c2255bc4 AH |
4737 | error_at (loc, "%<[*]%> not allowed in other than " |
4738 | "function prototype scope"); | |
52ffd86e MS |
4739 | declarator->u.array.vla_unspec_p = false; |
4740 | return NULL; | |
4741 | } | |
4742 | current_scope->had_vla_unspec = true; | |
4743 | } | |
f8893e47 | 4744 | return declarator; |
0e03329a JM |
4745 | } |
4746 | ||
f8893e47 JM |
4747 | /* Set the contained declarator of an array declarator. DECL is the |
4748 | declarator, as constructed by build_array_declarator; INNER is what | |
6ac0194d | 4749 | appears on the left of the []. */ |
0e03329a | 4750 | |
f8893e47 JM |
4751 | struct c_declarator * |
4752 | set_array_declarator_inner (struct c_declarator *decl, | |
6ac0194d | 4753 | struct c_declarator *inner) |
0e03329a | 4754 | { |
f8893e47 | 4755 | decl->declarator = inner; |
0e03329a JM |
4756 | return decl; |
4757 | } | |
1f0f7ceb RS |
4758 | |
4759 | /* INIT is a constructor that forms DECL's initializer. If the final | |
4760 | element initializes a flexible array field, add the size of that | |
4761 | initializer to DECL's size. */ | |
4762 | ||
4763 | static void | |
4764 | add_flexible_array_elts_to_size (tree decl, tree init) | |
4765 | { | |
1f0f7ceb RS |
4766 | tree elt, type; |
4767 | ||
9771b263 | 4768 | if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init))) |
1f0f7ceb RS |
4769 | return; |
4770 | ||
9771b263 | 4771 | elt = CONSTRUCTOR_ELTS (init)->last ().value; |
1f0f7ceb RS |
4772 | type = TREE_TYPE (elt); |
4773 | if (TREE_CODE (type) == ARRAY_TYPE | |
4774 | && TYPE_SIZE (type) == NULL_TREE | |
4775 | && TYPE_DOMAIN (type) != NULL_TREE | |
4776 | && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE) | |
4777 | { | |
4778 | complete_array_type (&type, elt, false); | |
4779 | DECL_SIZE (decl) | |
4780 | = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type)); | |
4781 | DECL_SIZE_UNIT (decl) | |
4782 | = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type)); | |
4783 | } | |
4784 | } | |
0e03329a | 4785 | \f |
928c19bb JM |
4786 | /* Decode a "typename", such as "int **", returning a ..._TYPE node. |
4787 | Set *EXPR, if EXPR not NULL, to any expression to be evaluated | |
4788 | before the type name, and set *EXPR_CONST_OPERANDS, if | |
4789 | EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may | |
4790 | appear in a constant expression. */ | |
51e29401 RS |
4791 | |
4792 | tree | |
928c19bb JM |
4793 | groktypename (struct c_type_name *type_name, tree *expr, |
4794 | bool *expr_const_operands) | |
51e29401 | 4795 | { |
f8893e47 | 4796 | tree type; |
deb176fa | 4797 | tree attrs = type_name->specs->attrs; |
d3b4cd6f | 4798 | |
deb176fa | 4799 | type_name->specs->attrs = NULL_TREE; |
d3b4cd6f | 4800 | |
deb176fa | 4801 | type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME, |
928c19bb JM |
4802 | false, NULL, &attrs, expr, expr_const_operands, |
4803 | DEPRECATED_NORMAL); | |
d3b4cd6f AH |
4804 | |
4805 | /* Apply attributes. */ | |
f8893e47 | 4806 | decl_attributes (&type, attrs, 0); |
d3b4cd6f | 4807 | |
f8893e47 | 4808 | return type; |
51e29401 RS |
4809 | } |
4810 | ||
acf0174b JJ |
4811 | /* Wrapper for decl_attributes that adds some implicit attributes |
4812 | to VAR_DECLs or FUNCTION_DECLs. */ | |
4813 | ||
4814 | static tree | |
4815 | c_decl_attributes (tree *node, tree attributes, int flags) | |
4816 | { | |
4817 | /* Add implicit "omp declare target" attribute if requested. */ | |
4818 | if (current_omp_declare_target_attribute | |
0ae9bd27 | 4819 | && ((VAR_P (*node) && is_global_var (*node)) |
acf0174b JJ |
4820 | || TREE_CODE (*node) == FUNCTION_DECL)) |
4821 | { | |
0ae9bd27 | 4822 | if (VAR_P (*node) |
e01d41e5 | 4823 | && !lang_hooks.types.omp_mappable_type (TREE_TYPE (*node))) |
9b452033 JJ |
4824 | attributes = tree_cons (get_identifier ("omp declare target implicit"), |
4825 | NULL_TREE, attributes); | |
acf0174b JJ |
4826 | else |
4827 | attributes = tree_cons (get_identifier ("omp declare target"), | |
4828 | NULL_TREE, attributes); | |
4829 | } | |
5d9ae53d MS |
4830 | |
4831 | /* Look up the current declaration with all the attributes merged | |
4832 | so far so that attributes on the current declaration that's | |
4833 | about to be pushed that conflict with the former can be detected, | |
4834 | diagnosed, and rejected as appropriate. */ | |
4835 | tree last_decl = lookup_name (DECL_NAME (*node)); | |
4836 | if (!last_decl) | |
4837 | last_decl = lookup_name_in_scope (DECL_NAME (*node), external_scope); | |
4838 | ||
4839 | return decl_attributes (node, attributes, flags, last_decl); | |
acf0174b JJ |
4840 | } |
4841 | ||
4842 | ||
51e29401 RS |
4843 | /* Decode a declarator in an ordinary declaration or data definition. |
4844 | This is called as soon as the type information and variable name | |
4845 | have been parsed, before parsing the initializer if any. | |
4846 | Here we create the ..._DECL node, fill in its type, | |
4847 | and put it on the list of decls for the current context. | |
4848 | The ..._DECL node is returned as the value. | |
4849 | ||
4850 | Exception: for arrays where the length is not specified, | |
4851 | the type is left null, to be filled in by `finish_decl'. | |
4852 | ||
4853 | Function definitions do not come here; they go to start_function | |
4854 | instead. However, external and forward declarations of functions | |
4855 | do go through here. Structure field declarations are done by | |
4856 | grokfield and not through here. */ | |
4857 | ||
51e29401 | 4858 | tree |
deb176fa | 4859 | start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs, |
f8893e47 | 4860 | bool initialized, tree attributes) |
51e29401 | 4861 | { |
e23bd218 | 4862 | tree decl; |
b3694847 | 4863 | tree tem; |
928c19bb | 4864 | tree expr = NULL_TREE; |
0da300cd | 4865 | enum deprecated_states deprecated_state = DEPRECATED_NORMAL; |
35b1a6fa | 4866 | |
e23bd218 IR |
4867 | /* An object declared as __attribute__((deprecated)) suppresses |
4868 | warnings of uses of other deprecated items. */ | |
4869 | if (lookup_attribute ("deprecated", attributes)) | |
4870 | deprecated_state = DEPRECATED_SUPPRESS; | |
4871 | ||
4872 | decl = grokdeclarator (declarator, declspecs, | |
928c19bb | 4873 | NORMAL, initialized, NULL, &attributes, &expr, NULL, |
0da300cd | 4874 | deprecated_state); |
e5165b60 MP |
4875 | if (!decl || decl == error_mark_node) |
4876 | return NULL_TREE; | |
35b1a6fa | 4877 | |
928c19bb | 4878 | if (expr) |
0e0d82a7 | 4879 | add_stmt (fold_convert (void_type_node, expr)); |
928c19bb | 4880 | |
0cd020ae PK |
4881 | if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl)) |
4882 | && TREE_PUBLIC (decl)) | |
dee15844 | 4883 | warning (OPT_Wmain, "%q+D is usually a function", decl); |
b8705e61 | 4884 | |
51e29401 RS |
4885 | if (initialized) |
4886 | /* Is it valid for this decl to have an initializer at all? | |
4887 | If not, set INITIALIZED to zero, which will indirectly | |
f75fbaf7 | 4888 | tell 'finish_decl' to ignore the initializer once it is parsed. */ |
51e29401 RS |
4889 | switch (TREE_CODE (decl)) |
4890 | { | |
4891 | case TYPE_DECL: | |
a9c697b8 | 4892 | error ("typedef %qD is initialized (use %<__typeof__%> instead)", decl); |
e3455240 | 4893 | initialized = false; |
51e29401 RS |
4894 | break; |
4895 | ||
4896 | case FUNCTION_DECL: | |
bda67431 | 4897 | error ("function %qD is initialized like a variable", decl); |
e3455240 | 4898 | initialized = false; |
51e29401 RS |
4899 | break; |
4900 | ||
4901 | case PARM_DECL: | |
4902 | /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */ | |
bda67431 | 4903 | error ("parameter %qD is initialized", decl); |
e3455240 | 4904 | initialized = false; |
51e29401 RS |
4905 | break; |
4906 | ||
4907 | default: | |
f75fbaf7 ZW |
4908 | /* Don't allow initializations for incomplete types except for |
4909 | arrays which might be completed by the initialization. */ | |
f4fce7ed | 4910 | |
f75fbaf7 ZW |
4911 | /* This can happen if the array size is an undefined macro. |
4912 | We already gave a warning, so we don't need another one. */ | |
f4fce7ed | 4913 | if (TREE_TYPE (decl) == error_mark_node) |
e3455240 | 4914 | initialized = false; |
f4fce7ed | 4915 | else if (COMPLETE_TYPE_P (TREE_TYPE (decl))) |
51e29401 RS |
4916 | { |
4917 | /* A complete type is ok if size is fixed. */ | |
4918 | ||
4919 | if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST | |
4920 | || C_DECL_VARIABLE_SIZE (decl)) | |
4921 | { | |
4922 | error ("variable-sized object may not be initialized"); | |
e3455240 | 4923 | initialized = false; |
51e29401 RS |
4924 | } |
4925 | } | |
4926 | else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE) | |
4927 | { | |
bda67431 | 4928 | error ("variable %qD has initializer but incomplete type", decl); |
e3455240 | 4929 | initialized = false; |
51e29401 | 4930 | } |
ef787822 JM |
4931 | else if (C_DECL_VARIABLE_SIZE (decl)) |
4932 | { | |
4933 | /* Although C99 is unclear about whether incomplete arrays | |
4934 | of VLAs themselves count as VLAs, it does not make | |
4935 | sense to permit them to be initialized given that | |
4936 | ordinary VLAs may not be initialized. */ | |
4937 | error ("variable-sized object may not be initialized"); | |
e3455240 | 4938 | initialized = false; |
ef787822 | 4939 | } |
51e29401 RS |
4940 | } |
4941 | ||
4942 | if (initialized) | |
4943 | { | |
f75fbaf7 | 4944 | if (current_scope == file_scope) |
51e29401 RS |
4945 | TREE_STATIC (decl) = 1; |
4946 | ||
f75fbaf7 | 4947 | /* Tell 'pushdecl' this is an initialized decl |
51e29401 | 4948 | even though we don't yet have the initializer expression. |
f75fbaf7 | 4949 | Also tell 'finish_decl' it may store the real initializer. */ |
51e29401 RS |
4950 | DECL_INITIAL (decl) = error_mark_node; |
4951 | } | |
4952 | ||
4953 | /* If this is a function declaration, write a record describing it to the | |
4954 | prototypes file (if requested). */ | |
4955 | ||
4956 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
f4da8dce | 4957 | gen_aux_info_record (decl, 0, 0, prototype_p (TREE_TYPE (decl))); |
51e29401 | 4958 | |
2786cbad JM |
4959 | /* ANSI specifies that a tentative definition which is not merged with |
4960 | a non-tentative definition behaves exactly like a definition with an | |
4961 | initializer equal to zero. (Section 3.7.2) | |
3d78f2e9 RH |
4962 | |
4963 | -fno-common gives strict ANSI behavior, though this tends to break | |
4964 | a large body of code that grew up without this rule. | |
4965 | ||
4966 | Thread-local variables are never common, since there's no entrenched | |
4967 | body of code to break, and it allows more efficient variable references | |
95bd1dd7 | 4968 | in the presence of dynamic linking. */ |
3d78f2e9 | 4969 | |
0ae9bd27 | 4970 | if (VAR_P (decl) |
3d78f2e9 RH |
4971 | && !initialized |
4972 | && TREE_PUBLIC (decl) | |
c2f7fa15 | 4973 | && !DECL_THREAD_LOCAL_P (decl) |
3d78f2e9 | 4974 | && !flag_no_common) |
2786cbad | 4975 | DECL_COMMON (decl) = 1; |
8615176a | 4976 | |
daa6d5ff | 4977 | /* Set attributes here so if duplicate decl, will have proper attributes. */ |
acf0174b | 4978 | c_decl_attributes (&decl, attributes, 0); |
daa6d5ff | 4979 | |
4eb7fd83 JJ |
4980 | /* Handle gnu_inline attribute. */ |
4981 | if (declspecs->inline_p | |
da1c7394 | 4982 | && !flag_gnu89_inline |
4eb7fd83 | 4983 | && TREE_CODE (decl) == FUNCTION_DECL |
6cf59865 JJ |
4984 | && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl)) |
4985 | || current_function_decl)) | |
4eb7fd83 JJ |
4986 | { |
4987 | if (declspecs->storage_class == csc_auto && current_scope != file_scope) | |
4988 | ; | |
4989 | else if (declspecs->storage_class != csc_static) | |
4990 | DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl); | |
4991 | } | |
4eb7fd83 | 4992 | |
61f71b34 DD |
4993 | if (TREE_CODE (decl) == FUNCTION_DECL |
4994 | && targetm.calls.promote_prototypes (TREE_TYPE (decl))) | |
4995 | { | |
f8893e47 | 4996 | struct c_declarator *ce = declarator; |
61f71b34 | 4997 | |
f8893e47 JM |
4998 | if (ce->kind == cdk_pointer) |
4999 | ce = declarator->declarator; | |
5000 | if (ce->kind == cdk_function) | |
61f71b34 | 5001 | { |
f8893e47 | 5002 | tree args = ce->u.arg_info->parms; |
910ad8de | 5003 | for (; args; args = DECL_CHAIN (args)) |
61f71b34 DD |
5004 | { |
5005 | tree type = TREE_TYPE (args); | |
1f4f60fc | 5006 | if (type && INTEGRAL_TYPE_P (type) |
61f71b34 | 5007 | && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) |
267bac10 | 5008 | DECL_ARG_TYPE (args) = c_type_promotes_to (type); |
61f71b34 DD |
5009 | } |
5010 | } | |
5011 | } | |
5012 | ||
9162542e AO |
5013 | if (TREE_CODE (decl) == FUNCTION_DECL |
5014 | && DECL_DECLARED_INLINE_P (decl) | |
5015 | && DECL_UNINLINABLE (decl) | |
5016 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl))) | |
0ecf545c MS |
5017 | warning (OPT_Wattributes, "inline function %q+D given attribute %qs", |
5018 | decl, "noinline"); | |
9162542e | 5019 | |
71113fcd GK |
5020 | /* C99 6.7.4p3: An inline definition of a function with external |
5021 | linkage shall not contain a definition of a modifiable object | |
5022 | with static storage duration... */ | |
0ae9bd27 | 5023 | if (VAR_P (decl) |
71113fcd GK |
5024 | && current_scope != file_scope |
5025 | && TREE_STATIC (decl) | |
1033ffa8 | 5026 | && !TREE_READONLY (decl) |
71113fcd GK |
5027 | && DECL_DECLARED_INLINE_P (current_function_decl) |
5028 | && DECL_EXTERNAL (current_function_decl)) | |
991d6621 JM |
5029 | record_inline_static (input_location, current_function_decl, |
5030 | decl, csi_modifiable); | |
71113fcd | 5031 | |
21b634ae MP |
5032 | if (c_dialect_objc () |
5033 | && VAR_OR_FUNCTION_DECL_P (decl)) | |
a6341d57 NP |
5034 | objc_check_global_decl (decl); |
5035 | ||
f8521984 | 5036 | /* Add this decl to the current scope. |
51e29401 RS |
5037 | TEM may equal DECL or it may be a previous decl of the same name. */ |
5038 | tem = pushdecl (decl); | |
5039 | ||
c1bbfd3c DJ |
5040 | if (initialized && DECL_EXTERNAL (tem)) |
5041 | { | |
5042 | DECL_EXTERNAL (tem) = 0; | |
5043 | TREE_STATIC (tem) = 1; | |
5044 | } | |
bbbcb2e1 | 5045 | |
51e29401 RS |
5046 | return tem; |
5047 | } | |
5048 | ||
51f4ec66 SZ |
5049 | /* Subroutine of finish_decl. TYPE is the type of an uninitialized object |
5050 | DECL or the non-array element type if DECL is an uninitialized array. | |
5051 | If that type has a const member, diagnose this. */ | |
5052 | ||
5053 | static void | |
5054 | diagnose_uninitialized_cst_member (tree decl, tree type) | |
5055 | { | |
5056 | tree field; | |
5057 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
5058 | { | |
5059 | tree field_type; | |
5060 | if (TREE_CODE (field) != FIELD_DECL) | |
5061 | continue; | |
5062 | field_type = strip_array_types (TREE_TYPE (field)); | |
5063 | ||
5064 | if (TYPE_QUALS (field_type) & TYPE_QUAL_CONST) | |
5065 | { | |
5066 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat, | |
5067 | "uninitialized const member in %qT is invalid in C++", | |
5068 | strip_array_types (TREE_TYPE (decl))); | |
5069 | inform (DECL_SOURCE_LOCATION (field), "%qD should be initialized", field); | |
5070 | } | |
5071 | ||
3e636daf | 5072 | if (RECORD_OR_UNION_TYPE_P (field_type)) |
51f4ec66 SZ |
5073 | diagnose_uninitialized_cst_member (decl, field_type); |
5074 | } | |
5075 | } | |
5076 | ||
51e29401 RS |
5077 | /* Finish processing of a declaration; |
5078 | install its initial value. | |
bbbbb16a | 5079 | If ORIGTYPE is not NULL_TREE, it is the original type of INIT. |
51e29401 | 5080 | If the length of an array type is not known before, |
c2255bc4 AH |
5081 | it must be determined now, from the initial value, or it is an error. |
5082 | ||
5083 | INIT_LOC is the location of the initial value. */ | |
51e29401 RS |
5084 | |
5085 | void | |
c2255bc4 | 5086 | finish_decl (tree decl, location_t init_loc, tree init, |
21b634ae | 5087 | tree origtype, tree asmspec_tree) |
51e29401 | 5088 | { |
aa24028d | 5089 | tree type; |
3fa8871b | 5090 | bool was_incomplete = (DECL_SIZE (decl) == NULL_TREE); |
520a57c8 | 5091 | const char *asmspec = 0; |
51e29401 | 5092 | |
6d2f8887 | 5093 | /* If a name was specified, get the string. */ |
21b634ae | 5094 | if (VAR_OR_FUNCTION_DECL_P (decl) |
1ae57298 | 5095 | && DECL_FILE_SCOPE_P (decl)) |
41c64394 | 5096 | asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree); |
51e29401 | 5097 | if (asmspec_tree) |
72f5a12b | 5098 | asmspec = TREE_STRING_POINTER (asmspec_tree); |
51e29401 | 5099 | |
0ae9bd27 | 5100 | if (VAR_P (decl) |
b646ba3f DS |
5101 | && TREE_STATIC (decl) |
5102 | && global_bindings_p ()) | |
5103 | /* So decl is a global variable. Record the types it uses | |
5104 | so that we can decide later to emit debug info for them. */ | |
5105 | record_types_used_by_current_var_decl (decl); | |
5106 | ||
51e29401 | 5107 | /* If `start_decl' didn't like having an initialization, ignore it now. */ |
3fa8871b MP |
5108 | if (init != NULL_TREE && DECL_INITIAL (decl) == NULL_TREE) |
5109 | init = NULL_TREE; | |
35b1a6fa | 5110 | |
51e29401 RS |
5111 | /* Don't crash if parm is initialized. */ |
5112 | if (TREE_CODE (decl) == PARM_DECL) | |
3fa8871b | 5113 | init = NULL_TREE; |
51e29401 RS |
5114 | |
5115 | if (init) | |
c2255bc4 | 5116 | store_init_value (init_loc, decl, init, origtype); |
51e29401 | 5117 | |
21b634ae | 5118 | if (c_dialect_objc () && (VAR_OR_FUNCTION_DECL_P (decl) |
0e6df31e | 5119 | || TREE_CODE (decl) == FIELD_DECL)) |
264fa2db ZL |
5120 | objc_check_decl (decl); |
5121 | ||
aa24028d AP |
5122 | type = TREE_TYPE (decl); |
5123 | ||
fbe83e6b JM |
5124 | /* Deduce size of array from initialization, if not already known. |
5125 | This is only needed for an initialization in the current scope; | |
5126 | it must not be done for a file-scope initialization of a | |
5127 | declaration with external linkage, redeclared in an inner scope | |
5128 | with the outer declaration shadowed in an intermediate scope. */ | |
51e29401 | 5129 | if (TREE_CODE (type) == ARRAY_TYPE |
3fa8871b | 5130 | && TYPE_DOMAIN (type) == NULL_TREE |
fbe83e6b JM |
5131 | && TREE_CODE (decl) != TYPE_DECL |
5132 | && !(TREE_PUBLIC (decl) && current_scope != file_scope)) | |
51e29401 | 5133 | { |
aab038d5 | 5134 | bool do_default |
51e29401 RS |
5135 | = (TREE_STATIC (decl) |
5136 | /* Even if pedantic, an external linkage array | |
5137 | may have incomplete type at first. */ | |
5138 | ? pedantic && !TREE_PUBLIC (decl) | |
1394aabd | 5139 | : !DECL_EXTERNAL (decl)); |
51e29401 | 5140 | int failure |
aab038d5 RH |
5141 | = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl), |
5142 | do_default); | |
51e29401 RS |
5143 | |
5144 | /* Get the completed type made by complete_array_type. */ | |
5145 | type = TREE_TYPE (decl); | |
5146 | ||
317a9ac3 | 5147 | switch (failure) |
51e29401 | 5148 | { |
317a9ac3 | 5149 | case 1: |
dee15844 | 5150 | error ("initializer fails to determine size of %q+D", decl); |
317a9ac3 RH |
5151 | break; |
5152 | ||
5153 | case 2: | |
51e29401 | 5154 | if (do_default) |
dee15844 | 5155 | error ("array size missing in %q+D", decl); |
317a9ac3 RH |
5156 | break; |
5157 | ||
5158 | case 3: | |
dee15844 | 5159 | error ("zero or negative size array %q+D", decl); |
317a9ac3 RH |
5160 | break; |
5161 | ||
5162 | case 0: | |
5163 | /* For global variables, update the copy of the type that | |
5164 | exists in the binding. */ | |
5165 | if (TREE_PUBLIC (decl)) | |
5166 | { | |
5167 | struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl)); | |
5168 | while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext)) | |
5169 | b_ext = b_ext->shadowed; | |
0b05329b | 5170 | if (b_ext && TREE_CODE (decl) == TREE_CODE (b_ext->decl)) |
317a9ac3 | 5171 | { |
2609a0ce | 5172 | if (b_ext->u.type && comptypes (b_ext->u.type, type)) |
e1b7793c | 5173 | b_ext->u.type = composite_type (b_ext->u.type, type); |
317a9ac3 | 5174 | else |
e1b7793c | 5175 | b_ext->u.type = type; |
317a9ac3 RH |
5176 | } |
5177 | } | |
5178 | break; | |
5179 | ||
5180 | default: | |
5181 | gcc_unreachable (); | |
51e29401 | 5182 | } |
51e29401 | 5183 | |
aab038d5 RH |
5184 | if (DECL_INITIAL (decl)) |
5185 | TREE_TYPE (DECL_INITIAL (decl)) = type; | |
5186 | ||
156030d3 | 5187 | relayout_decl (decl); |
51e29401 RS |
5188 | } |
5189 | ||
bec1da64 MS |
5190 | /* Look for braced array initializers for character arrays and |
5191 | recursively convert them into STRING_CSTs. */ | |
5192 | if (tree init = DECL_INITIAL (decl)) | |
5193 | DECL_INITIAL (decl) = braced_lists_to_strings (type, init); | |
b5764229 | 5194 | |
0ae9bd27 | 5195 | if (VAR_P (decl)) |
51e29401 | 5196 | { |
1f0f7ceb RS |
5197 | if (init && TREE_CODE (init) == CONSTRUCTOR) |
5198 | add_flexible_array_elts_to_size (decl, init); | |
5199 | ||
6d900107 BE |
5200 | complete_flexible_array_elts (DECL_INITIAL (decl)); |
5201 | ||
3fa8871b | 5202 | if (DECL_SIZE (decl) == NULL_TREE && TREE_TYPE (decl) != error_mark_node |
f4fce7ed | 5203 | && COMPLETE_TYPE_P (TREE_TYPE (decl))) |
d575f110 RS |
5204 | layout_decl (decl, 0); |
5205 | ||
3fa8871b | 5206 | if (DECL_SIZE (decl) == NULL_TREE |
f4fce7ed JW |
5207 | /* Don't give an error if we already gave one earlier. */ |
5208 | && TREE_TYPE (decl) != error_mark_node | |
a7f64d52 | 5209 | && (TREE_STATIC (decl) |
0e6df31e GK |
5210 | /* A static variable with an incomplete type |
5211 | is an error if it is initialized. | |
5212 | Also if it is not file scope. | |
5213 | Otherwise, let it through, but if it is not `extern' | |
5214 | then it may cause an error message later. */ | |
3fa8871b | 5215 | ? (DECL_INITIAL (decl) != NULL_TREE |
4b1e44be | 5216 | || !DECL_FILE_SCOPE_P (decl)) |
0e6df31e GK |
5217 | /* An automatic variable with an incomplete type |
5218 | is an error. */ | |
5219 | : !DECL_EXTERNAL (decl))) | |
5220 | { | |
dee15844 | 5221 | error ("storage size of %q+D isn%'t known", decl); |
0e6df31e GK |
5222 | TREE_TYPE (decl) = error_mark_node; |
5223 | } | |
51e29401 | 5224 | |
d25c7690 PK |
5225 | if ((RECORD_OR_UNION_TYPE_P (TREE_TYPE (decl)) |
5226 | || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE) | |
5227 | && DECL_SIZE (decl) == NULL_TREE | |
5228 | && TREE_STATIC (decl)) | |
5229 | incomplete_record_decls.safe_push (decl); | |
5230 | ||
3fa8871b | 5231 | if (is_global_var (decl) && DECL_SIZE (decl) != NULL_TREE) |
e681c5a1 RS |
5232 | { |
5233 | if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST) | |
5234 | constant_expression_warning (DECL_SIZE (decl)); | |
5235 | else | |
b97d8153 JJ |
5236 | { |
5237 | error ("storage size of %q+D isn%'t constant", decl); | |
5238 | TREE_TYPE (decl) = error_mark_node; | |
5239 | } | |
e681c5a1 | 5240 | } |
e9a25f70 | 5241 | |
6645c3fa | 5242 | if (TREE_USED (type)) |
ebfbbdc5 JJ |
5243 | { |
5244 | TREE_USED (decl) = 1; | |
5245 | DECL_READ_P (decl) = 1; | |
5246 | } | |
51e29401 RS |
5247 | } |
5248 | ||
9661b15f | 5249 | /* If this is a function and an assembler name is specified, reset DECL_RTL |
e79983f4 | 5250 | so we can give it its new name. Also, update builtin_decl if it |
9661b15f | 5251 | was a normal built-in. */ |
3c4afaa5 | 5252 | if (TREE_CODE (decl) == FUNCTION_DECL && asmspec) |
6645c3fa | 5253 | { |
9661b15f | 5254 | if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL) |
b482789c | 5255 | set_builtin_user_assembler_name (decl, asmspec); |
0e6df31e | 5256 | set_user_assembler_name (decl, asmspec); |
6645c3fa | 5257 | } |
3c4afaa5 | 5258 | |
d05cc98e | 5259 | /* If #pragma weak was used, mark the decl weak now. */ |
3693d46c | 5260 | maybe_apply_pragma_weak (decl); |
d05cc98e | 5261 | |
51e29401 RS |
5262 | /* Output the assembler code and/or RTL code for variables and functions, |
5263 | unless the type is an undefined structure or union. | |
5264 | If not, it will get done when the type is completed. */ | |
5265 | ||
21b634ae | 5266 | if (VAR_OR_FUNCTION_DECL_P (decl)) |
51e29401 | 5267 | { |
b9e75696 JM |
5268 | /* Determine the ELF visibility. */ |
5269 | if (TREE_PUBLIC (decl)) | |
5270 | c_determine_visibility (decl); | |
5271 | ||
0f7866e7 | 5272 | /* This is a no-op in c-lang.c or something real in objc-act.c. */ |
37fa72e9 | 5273 | if (c_dialect_objc ()) |
0f7866e7 | 5274 | objc_check_decl (decl); |
8f17b5c5 | 5275 | |
c22cacf3 | 5276 | if (asmspec) |
0e6df31e GK |
5277 | { |
5278 | /* If this is not a static variable, issue a warning. | |
5279 | It doesn't make any sense to give an ASMSPEC for an | |
5280 | ordinary, non-register local variable. Historically, | |
5281 | GCC has accepted -- but ignored -- the ASMSPEC in | |
5282 | this case. */ | |
3f75a254 | 5283 | if (!DECL_FILE_SCOPE_P (decl) |
0ae9bd27 | 5284 | && VAR_P (decl) |
0e6df31e GK |
5285 | && !C_DECL_REGISTER (decl) |
5286 | && !TREE_STATIC (decl)) | |
a9c697b8 | 5287 | warning (0, "ignoring %<asm%> specifier for non-static local " |
dee15844 | 5288 | "variable %q+D", decl); |
0e6df31e GK |
5289 | else |
5290 | set_user_assembler_name (decl, asmspec); | |
5291 | } | |
c22cacf3 | 5292 | |
4b1e44be | 5293 | if (DECL_FILE_SCOPE_P (decl)) |
8cf8d8a2 JM |
5294 | { |
5295 | if (DECL_INITIAL (decl) == NULL_TREE | |
5296 | || DECL_INITIAL (decl) == error_mark_node) | |
5297 | /* Don't output anything | |
5298 | when a tentative file-scope definition is seen. | |
5299 | But at end of compilation, do output code for them. */ | |
5300 | DECL_DEFER_OUTPUT (decl) = 1; | |
10fa8dfb | 5301 | if (asmspec && VAR_P (decl) && C_DECL_REGISTER (decl)) |
6d6c9525 | 5302 | DECL_HARD_REGISTER (decl) = 1; |
0e6df31e | 5303 | rest_of_decl_compilation (decl, true, 0); |
8cf8d8a2 | 5304 | } |
8f17b5c5 MM |
5305 | else |
5306 | { | |
0e6df31e GK |
5307 | /* In conjunction with an ASMSPEC, the `register' |
5308 | keyword indicates that we should place the variable | |
5309 | in a particular register. */ | |
5310 | if (asmspec && C_DECL_REGISTER (decl)) | |
3645c4dc | 5311 | { |
0e6df31e GK |
5312 | DECL_HARD_REGISTER (decl) = 1; |
5313 | /* This cannot be done for a structure with volatile | |
5314 | fields, on which DECL_REGISTER will have been | |
5315 | reset. */ | |
5316 | if (!DECL_REGISTER (decl)) | |
5317 | error ("cannot put object with volatile field into register"); | |
3645c4dc | 5318 | } |
0adc3c19 | 5319 | |
c0a4369a | 5320 | if (TREE_CODE (decl) != FUNCTION_DECL) |
174283a3 RH |
5321 | { |
5322 | /* If we're building a variable sized type, and we might be | |
5323 | reachable other than via the top of the current binding | |
5324 | level, then create a new BIND_EXPR so that we deallocate | |
5325 | the object at the right time. */ | |
5326 | /* Note that DECL_SIZE can be null due to errors. */ | |
5327 | if (DECL_SIZE (decl) | |
5328 | && !TREE_CONSTANT (DECL_SIZE (decl)) | |
5329 | && STATEMENT_LIST_HAS_LABEL (cur_stmt_list)) | |
5330 | { | |
5331 | tree bind; | |
53fb4de3 | 5332 | bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL); |
174283a3 RH |
5333 | TREE_SIDE_EFFECTS (bind) = 1; |
5334 | add_stmt (bind); | |
5335 | BIND_EXPR_BODY (bind) = push_stmt_list (); | |
5336 | } | |
c2255bc4 AH |
5337 | add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), |
5338 | DECL_EXPR, decl)); | |
174283a3 | 5339 | } |
8f17b5c5 | 5340 | } |
c22cacf3 | 5341 | |
4dd7201e | 5342 | |
4b1e44be | 5343 | if (!DECL_FILE_SCOPE_P (decl)) |
51e29401 RS |
5344 | { |
5345 | /* Recompute the RTL of a local array now | |
5346 | if it used to be an incomplete type. */ | |
62f9079a | 5347 | if (was_incomplete && !is_global_var (decl)) |
51e29401 RS |
5348 | { |
5349 | /* If we used it already as memory, it must stay in memory. */ | |
5350 | TREE_ADDRESSABLE (decl) = TREE_USED (decl); | |
5351 | /* If it's still incomplete now, no init will save it. */ | |
3fa8871b MP |
5352 | if (DECL_SIZE (decl) == NULL_TREE) |
5353 | DECL_INITIAL (decl) = NULL_TREE; | |
51e29401 | 5354 | } |
51e29401 RS |
5355 | } |
5356 | } | |
5357 | ||
5358 | if (TREE_CODE (decl) == TYPE_DECL) | |
1c9766da RK |
5359 | { |
5360 | if (!DECL_FILE_SCOPE_P (decl) | |
5377d5ba | 5361 | && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) |
c2255bc4 | 5362 | add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl)); |
1c9766da | 5363 | |
0e6df31e | 5364 | rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0); |
1c9766da | 5365 | } |
51e29401 | 5366 | |
0bfa5f65 | 5367 | /* Install a cleanup (aka destructor) if one was given. */ |
0ae9bd27 | 5368 | if (VAR_P (decl) && !TREE_STATIC (decl)) |
0bfa5f65 RH |
5369 | { |
5370 | tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl)); | |
5371 | if (attr) | |
5372 | { | |
0bfa5f65 RH |
5373 | tree cleanup_id = TREE_VALUE (TREE_VALUE (attr)); |
5374 | tree cleanup_decl = lookup_name (cleanup_id); | |
5375 | tree cleanup; | |
9771b263 | 5376 | vec<tree, va_gc> *v; |
0bfa5f65 RH |
5377 | |
5378 | /* Build "cleanup(&decl)" for the destructor. */ | |
e51fbec3 | 5379 | cleanup = build_unary_op (input_location, ADDR_EXPR, decl, false); |
9771b263 DN |
5380 | vec_alloc (v, 1); |
5381 | v->quick_push (cleanup); | |
8edbfaa6 JJ |
5382 | cleanup = c_build_function_call_vec (DECL_SOURCE_LOCATION (decl), |
5383 | vNULL, cleanup_decl, v, NULL); | |
9771b263 | 5384 | vec_free (v); |
0bfa5f65 RH |
5385 | |
5386 | /* Don't warn about decl unused; the cleanup uses it. */ | |
5387 | TREE_USED (decl) = 1; | |
325c3691 | 5388 | TREE_USED (cleanup_decl) = 1; |
ebfbbdc5 | 5389 | DECL_READ_P (decl) = 1; |
0bfa5f65 | 5390 | |
325c3691 | 5391 | push_cleanup (decl, cleanup, false); |
0bfa5f65 RH |
5392 | } |
5393 | } | |
642324bb ILT |
5394 | |
5395 | if (warn_cxx_compat | |
0ae9bd27 | 5396 | && VAR_P (decl) |
642324bb ILT |
5397 | && !DECL_EXTERNAL (decl) |
5398 | && DECL_INITIAL (decl) == NULL_TREE) | |
51f4ec66 SZ |
5399 | { |
5400 | type = strip_array_types (type); | |
5401 | if (TREE_READONLY (decl)) | |
5402 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat, | |
0ecf545c | 5403 | "uninitialized %<const %D%> is invalid in C++", decl); |
3e636daf | 5404 | else if (RECORD_OR_UNION_TYPE_P (type) |
51f4ec66 SZ |
5405 | && C_TYPE_FIELDS_READONLY (type)) |
5406 | diagnose_uninitialized_cst_member (decl, type); | |
5407 | } | |
4309e92c | 5408 | |
9b452033 JJ |
5409 | if (flag_openmp |
5410 | && VAR_P (decl) | |
5411 | && lookup_attribute ("omp declare target implicit", | |
5412 | DECL_ATTRIBUTES (decl))) | |
5413 | { | |
5414 | DECL_ATTRIBUTES (decl) | |
5415 | = remove_attribute ("omp declare target implicit", | |
5416 | DECL_ATTRIBUTES (decl)); | |
5417 | if (!lang_hooks.types.omp_mappable_type (TREE_TYPE (decl))) | |
5418 | error ("%q+D in declare target directive does not have mappable type", | |
5419 | decl); | |
5420 | else if (!lookup_attribute ("omp declare target", | |
5421 | DECL_ATTRIBUTES (decl)) | |
5422 | && !lookup_attribute ("omp declare target link", | |
5423 | DECL_ATTRIBUTES (decl))) | |
5424 | DECL_ATTRIBUTES (decl) | |
5425 | = tree_cons (get_identifier ("omp declare target"), | |
5426 | NULL_TREE, DECL_ATTRIBUTES (decl)); | |
5427 | } | |
5428 | ||
5429 | invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl); | |
51e29401 RS |
5430 | } |
5431 | ||
a04a722b JM |
5432 | /* Given a parsed parameter declaration, decode it into a PARM_DECL. |
5433 | EXPR is NULL or a pointer to an expression that needs to be | |
5434 | evaluated for the side effects of array size expressions in the | |
5435 | parameters. */ | |
c34be55e ZL |
5436 | |
5437 | tree | |
a04a722b | 5438 | grokparm (const struct c_parm *parm, tree *expr) |
c34be55e | 5439 | { |
b9baeecd | 5440 | tree attrs = parm->attrs; |
f8893e47 | 5441 | tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, |
a04a722b | 5442 | NULL, &attrs, expr, NULL, DEPRECATED_NORMAL); |
c34be55e | 5443 | |
b9baeecd | 5444 | decl_attributes (&decl, attrs, 0); |
c34be55e ZL |
5445 | |
5446 | return decl; | |
5447 | } | |
5448 | ||
55d54003 | 5449 | /* Given a parsed parameter declaration, decode it into a PARM_DECL |
a04a722b JM |
5450 | and push that on the current scope. EXPR is a pointer to an |
5451 | expression that needs to be evaluated for the side effects of array | |
5452 | size expressions in the parameters. */ | |
51e29401 RS |
5453 | |
5454 | void | |
a04a722b | 5455 | push_parm_decl (const struct c_parm *parm, tree *expr) |
51e29401 | 5456 | { |
b9baeecd | 5457 | tree attrs = parm->attrs; |
6cc902a1 | 5458 | tree decl; |
14077d68 | 5459 | |
0da300cd | 5460 | decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL, |
a04a722b | 5461 | &attrs, expr, NULL, DEPRECATED_NORMAL); |
8139a48e DM |
5462 | if (decl && DECL_P (decl)) |
5463 | DECL_SOURCE_LOCATION (decl) = parm->loc; | |
b9baeecd | 5464 | decl_attributes (&decl, attrs, 0); |
6a5ed5bf | 5465 | |
51e29401 RS |
5466 | decl = pushdecl (decl); |
5467 | ||
c2255bc4 | 5468 | finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE); |
51e29401 RS |
5469 | } |
5470 | ||
f75fbaf7 | 5471 | /* Mark all the parameter declarations to date as forward decls. |
f91f41b2 | 5472 | Also diagnose use of this extension. */ |
51e29401 RS |
5473 | |
5474 | void | |
55d54003 | 5475 | mark_forward_parm_decls (void) |
51e29401 | 5476 | { |
f75fbaf7 | 5477 | struct c_binding *b; |
55d54003 ZW |
5478 | |
5479 | if (pedantic && !current_scope->warned_forward_parm_decls) | |
5480 | { | |
c1771a20 | 5481 | pedwarn (input_location, OPT_Wpedantic, |
509c9d60 | 5482 | "ISO C forbids forward parameter declarations"); |
55d54003 ZW |
5483 | current_scope->warned_forward_parm_decls = true; |
5484 | } | |
5485 | ||
f75fbaf7 ZW |
5486 | for (b = current_scope->bindings; b; b = b->prev) |
5487 | if (TREE_CODE (b->decl) == PARM_DECL) | |
5488 | TREE_ASM_WRITTEN (b->decl) = 1; | |
51e29401 RS |
5489 | } |
5490 | \f | |
db3acfa5 JM |
5491 | /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound |
5492 | literal, which may be an incomplete array type completed by the | |
c2255bc4 | 5493 | initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound |
928c19bb | 5494 | literal. NON_CONST is true if the initializers contain something |
4b2b493f JM |
5495 | that cannot occur in a constant expression. If ALIGNAS_ALIGN is nonzero, |
5496 | it is the (valid) alignment for this compound literal, as specified | |
5497 | with _Alignas. */ | |
db3acfa5 JM |
5498 | |
5499 | tree | |
4b2b493f JM |
5500 | build_compound_literal (location_t loc, tree type, tree init, bool non_const, |
5501 | unsigned int alignas_align) | |
db3acfa5 JM |
5502 | { |
5503 | /* We do not use start_decl here because we have a type, not a declarator; | |
5504 | and do not use finish_decl because the decl should be stored inside | |
350fae66 | 5505 | the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */ |
ef787822 | 5506 | tree decl; |
db3acfa5 | 5507 | tree complit; |
8d37a5c0 | 5508 | tree stmt; |
ef787822 | 5509 | |
3e23fb2e AP |
5510 | if (type == error_mark_node |
5511 | || init == error_mark_node) | |
ef787822 JM |
5512 | return error_mark_node; |
5513 | ||
c2255bc4 | 5514 | decl = build_decl (loc, VAR_DECL, NULL_TREE, type); |
db3acfa5 JM |
5515 | DECL_EXTERNAL (decl) = 0; |
5516 | TREE_PUBLIC (decl) = 0; | |
f75fbaf7 | 5517 | TREE_STATIC (decl) = (current_scope == file_scope); |
db3acfa5 JM |
5518 | DECL_CONTEXT (decl) = current_function_decl; |
5519 | TREE_USED (decl) = 1; | |
ebfbbdc5 | 5520 | DECL_READ_P (decl) = 1; |
142473df MP |
5521 | DECL_ARTIFICIAL (decl) = 1; |
5522 | DECL_IGNORED_P (decl) = 1; | |
fe509359 | 5523 | C_DECL_COMPOUND_LITERAL_P (decl) = 1; |
db3acfa5 | 5524 | TREE_TYPE (decl) = type; |
2a389958 | 5525 | c_apply_type_quals_to_decl (TYPE_QUALS (strip_array_types (type)), decl); |
4b2b493f JM |
5526 | if (alignas_align) |
5527 | { | |
5528 | SET_DECL_ALIGN (decl, alignas_align * BITS_PER_UNIT); | |
5529 | DECL_USER_ALIGN (decl) = 1; | |
5530 | } | |
c2255bc4 | 5531 | store_init_value (loc, decl, init, NULL_TREE); |
db3acfa5 JM |
5532 | |
5533 | if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type)) | |
5534 | { | |
aab038d5 RH |
5535 | int failure = complete_array_type (&TREE_TYPE (decl), |
5536 | DECL_INITIAL (decl), true); | |
da0fc454 MP |
5537 | /* If complete_array_type returns 3, it means that the |
5538 | initial value of the compound literal is empty. Allow it. */ | |
5539 | gcc_assert (failure == 0 || failure == 3); | |
aab038d5 RH |
5540 | |
5541 | type = TREE_TYPE (decl); | |
5542 | TREE_TYPE (DECL_INITIAL (decl)) = type; | |
db3acfa5 JM |
5543 | } |
5544 | ||
db3acfa5 | 5545 | if (type == error_mark_node || !COMPLETE_TYPE_P (type)) |
cce50861 | 5546 | { |
4f2e1536 | 5547 | c_incomplete_type_error (loc, NULL_TREE, type); |
cce50861 JJ |
5548 | return error_mark_node; |
5549 | } | |
db3acfa5 | 5550 | |
c2255bc4 | 5551 | stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl); |
aab038d5 | 5552 | complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt); |
db3acfa5 JM |
5553 | TREE_SIDE_EFFECTS (complit) = 1; |
5554 | ||
5555 | layout_decl (decl, 0); | |
5556 | ||
5557 | if (TREE_STATIC (decl)) | |
5558 | { | |
3b2db49f MM |
5559 | /* This decl needs a name for the assembler output. */ |
5560 | set_compound_literal_name (decl); | |
cf3c4f56 JJ |
5561 | DECL_DEFER_OUTPUT (decl) = 1; |
5562 | DECL_COMDAT (decl) = 1; | |
cf3c4f56 | 5563 | pushdecl (decl); |
0e6df31e | 5564 | rest_of_decl_compilation (decl, 1, 0); |
db3acfa5 | 5565 | } |
f4b7e754 | 5566 | else if (current_function_decl && !current_scope->parm_flag) |
b33a0cb3 | 5567 | pushdecl (decl); |
db3acfa5 | 5568 | |
928c19bb JM |
5569 | if (non_const) |
5570 | { | |
5571 | complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit); | |
5572 | C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1; | |
5573 | } | |
5574 | ||
db3acfa5 JM |
5575 | return complit; |
5576 | } | |
24b97832 ILT |
5577 | |
5578 | /* Check the type of a compound literal. Here we just check that it | |
5579 | is valid for C++. */ | |
5580 | ||
5581 | void | |
c2255bc4 | 5582 | check_compound_literal_type (location_t loc, struct c_type_name *type_name) |
24b97832 | 5583 | { |
9e5b2115 PB |
5584 | if (warn_cxx_compat |
5585 | && (type_name->specs->typespec_kind == ctsk_tagdef | |
5586 | || type_name->specs->typespec_kind == ctsk_tagfirstref)) | |
24b97832 ILT |
5587 | warning_at (loc, OPT_Wc___compat, |
5588 | "defining a type in a compound literal is invalid in C++"); | |
5589 | } | |
db3acfa5 | 5590 | \f |
2984fe64 JM |
5591 | /* Determine whether TYPE is a structure with a flexible array member, |
5592 | or a union containing such a structure (possibly recursively). */ | |
5593 | ||
5594 | static bool | |
35b1a6fa | 5595 | flexible_array_type_p (tree type) |
2984fe64 JM |
5596 | { |
5597 | tree x; | |
5598 | switch (TREE_CODE (type)) | |
5599 | { | |
5600 | case RECORD_TYPE: | |
5601 | x = TYPE_FIELDS (type); | |
5602 | if (x == NULL_TREE) | |
5603 | return false; | |
910ad8de NF |
5604 | while (DECL_CHAIN (x) != NULL_TREE) |
5605 | x = DECL_CHAIN (x); | |
2984fe64 JM |
5606 | if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE |
5607 | && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE | |
5608 | && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE | |
5609 | && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE) | |
5610 | return true; | |
5611 | return false; | |
5612 | case UNION_TYPE: | |
910ad8de | 5613 | for (x = TYPE_FIELDS (type); x != NULL_TREE; x = DECL_CHAIN (x)) |
2984fe64 JM |
5614 | { |
5615 | if (flexible_array_type_p (TREE_TYPE (x))) | |
5616 | return true; | |
5617 | } | |
5618 | return false; | |
5619 | default: | |
5620 | return false; | |
5621 | } | |
5622 | } | |
5623 | \f | |
2ff7cce4 JM |
5624 | /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME, |
5625 | replacing with appropriate values if they are invalid. */ | |
420a9d9b | 5626 | |
2ff7cce4 | 5627 | static void |
420a9d9b MP |
5628 | check_bitfield_type_and_width (location_t loc, tree *type, tree *width, |
5629 | tree orig_name) | |
2ff7cce4 JM |
5630 | { |
5631 | tree type_mv; | |
5632 | unsigned int max_width; | |
5633 | unsigned HOST_WIDE_INT w; | |
88388a52 JM |
5634 | const char *name = (orig_name |
5635 | ? identifier_to_locale (IDENTIFIER_POINTER (orig_name)) | |
5636 | : _("<anonymous>")); | |
2ff7cce4 | 5637 | |
2ff7cce4 JM |
5638 | /* Detect and ignore out of range field width and process valid |
5639 | field widths. */ | |
d3ae6c2a | 5640 | if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))) |
2ff7cce4 | 5641 | { |
420a9d9b | 5642 | error_at (loc, "bit-field %qs width not an integer constant", name); |
2ff7cce4 JM |
5643 | *width = integer_one_node; |
5644 | } | |
5645 | else | |
5646 | { | |
d3ae6c2a JM |
5647 | if (TREE_CODE (*width) != INTEGER_CST) |
5648 | { | |
5649 | *width = c_fully_fold (*width, false, NULL); | |
5650 | if (TREE_CODE (*width) == INTEGER_CST) | |
420a9d9b | 5651 | pedwarn (loc, OPT_Wpedantic, |
d3ae6c2a JM |
5652 | "bit-field %qs width not an integer constant expression", |
5653 | name); | |
5654 | } | |
5655 | if (TREE_CODE (*width) != INTEGER_CST) | |
5656 | { | |
420a9d9b | 5657 | error_at (loc, "bit-field %qs width not an integer constant", name); |
d3ae6c2a JM |
5658 | *width = integer_one_node; |
5659 | } | |
2ff7cce4 JM |
5660 | constant_expression_warning (*width); |
5661 | if (tree_int_cst_sgn (*width) < 0) | |
5662 | { | |
420a9d9b | 5663 | error_at (loc, "negative width in bit-field %qs", name); |
2ff7cce4 JM |
5664 | *width = integer_one_node; |
5665 | } | |
5666 | else if (integer_zerop (*width) && orig_name) | |
5667 | { | |
420a9d9b | 5668 | error_at (loc, "zero width for bit-field %qs", name); |
2ff7cce4 JM |
5669 | *width = integer_one_node; |
5670 | } | |
5671 | } | |
5672 | ||
5673 | /* Detect invalid bit-field type. */ | |
5674 | if (TREE_CODE (*type) != INTEGER_TYPE | |
5675 | && TREE_CODE (*type) != BOOLEAN_TYPE | |
5676 | && TREE_CODE (*type) != ENUMERAL_TYPE) | |
5677 | { | |
420a9d9b | 5678 | error_at (loc, "bit-field %qs has invalid type", name); |
2ff7cce4 JM |
5679 | *type = unsigned_type_node; |
5680 | } | |
5681 | ||
00aa1fa2 L |
5682 | if (TYPE_WARN_IF_NOT_ALIGN (*type)) |
5683 | { | |
5684 | error_at (loc, "cannot declare bit-field %qs with %<warn_if_not_aligned%> type", | |
5685 | name); | |
5686 | *type = unsigned_type_node; | |
5687 | } | |
5688 | ||
2ff7cce4 | 5689 | type_mv = TYPE_MAIN_VARIANT (*type); |
8400e75e | 5690 | if (!in_system_header_at (input_location) |
2ff7cce4 JM |
5691 | && type_mv != integer_type_node |
5692 | && type_mv != unsigned_type_node | |
f3bede71 | 5693 | && type_mv != boolean_type_node) |
420a9d9b | 5694 | pedwarn_c90 (loc, OPT_Wpedantic, |
f3bede71 | 5695 | "type of bit-field %qs is a GCC extension", name); |
2ff7cce4 | 5696 | |
02668aba | 5697 | max_width = TYPE_PRECISION (*type); |
2ff7cce4 | 5698 | |
01512446 | 5699 | if (compare_tree_int (*width, max_width) > 0) |
2ff7cce4 | 5700 | { |
420a9d9b | 5701 | error_at (loc, "width of %qs exceeds its type", name); |
2ff7cce4 | 5702 | w = max_width; |
c62c040f | 5703 | *width = build_int_cst (integer_type_node, w); |
2ff7cce4 JM |
5704 | } |
5705 | else | |
ae7e9ddd | 5706 | w = tree_to_uhwi (*width); |
2ff7cce4 | 5707 | |
6de9cd9a DN |
5708 | if (TREE_CODE (*type) == ENUMERAL_TYPE) |
5709 | { | |
5710 | struct lang_type *lt = TYPE_LANG_SPECIFIC (*type); | |
118a3a8b | 5711 | if (!lt |
807e902e KZ |
5712 | || w < tree_int_cst_min_precision (lt->enum_min, TYPE_SIGN (*type)) |
5713 | || w < tree_int_cst_min_precision (lt->enum_max, TYPE_SIGN (*type))) | |
420a9d9b | 5714 | warning_at (loc, 0, "%qs is narrower than values of its type", name); |
6de9cd9a | 5715 | } |
2ff7cce4 | 5716 | } |
0b359b01 | 5717 | |
2ff7cce4 | 5718 | \f |
50d50fc7 SP |
5719 | |
5720 | /* Print warning about variable length array if necessary. */ | |
5721 | ||
5722 | static void | |
88388a52 | 5723 | warn_variable_length_array (tree name, tree size) |
50d50fc7 | 5724 | { |
177cce46 | 5725 | if (TREE_CONSTANT (size)) |
50d50fc7 | 5726 | { |
f3bede71 | 5727 | if (name) |
177cce46 | 5728 | pedwarn_c90 (input_location, OPT_Wvla, |
88388a52 | 5729 | "ISO C90 forbids array %qE whose size " |
a9c697b8 | 5730 | "cannot be evaluated", name); |
50d50fc7 | 5731 | else |
177cce46 | 5732 | pedwarn_c90 (input_location, OPT_Wvla, "ISO C90 forbids array " |
a9c697b8 | 5733 | "whose size cannot be evaluated"); |
50d50fc7 | 5734 | } |
f3bede71 | 5735 | else |
50d50fc7 | 5736 | { |
f3bede71 | 5737 | if (name) |
177cce46 | 5738 | pedwarn_c90 (input_location, OPT_Wvla, |
f3bede71 | 5739 | "ISO C90 forbids variable length array %qE", name); |
50d50fc7 | 5740 | else |
177cce46 | 5741 | pedwarn_c90 (input_location, OPT_Wvla, "ISO C90 forbids variable " |
f3bede71 | 5742 | "length array"); |
50d50fc7 SP |
5743 | } |
5744 | } | |
5745 | ||
35aff4fb MP |
5746 | /* Print warning about defaulting to int if necessary. */ |
5747 | ||
5748 | static void | |
5749 | warn_defaults_to (location_t location, int opt, const char *gmsgid, ...) | |
5750 | { | |
5751 | diagnostic_info diagnostic; | |
5752 | va_list ap; | |
ebedc9a3 | 5753 | rich_location richloc (line_table, location); |
35aff4fb MP |
5754 | |
5755 | va_start (ap, gmsgid); | |
8a645150 | 5756 | diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc, |
35aff4fb MP |
5757 | flag_isoc99 ? DK_PEDWARN : DK_WARNING); |
5758 | diagnostic.option_index = opt; | |
56d35585 | 5759 | diagnostic_report_diagnostic (global_dc, &diagnostic); |
35aff4fb MP |
5760 | va_end (ap); |
5761 | } | |
5762 | ||
8a14afd0 BS |
5763 | /* Returns the smallest location != UNKNOWN_LOCATION in LOCATIONS, |
5764 | considering only those c_declspec_words found in LIST, which | |
5765 | must be terminated by cdw_number_of_elements. */ | |
5766 | ||
5767 | static location_t | |
5768 | smallest_type_quals_location (const location_t *locations, | |
5769 | const c_declspec_word *list) | |
5770 | { | |
5771 | location_t loc = UNKNOWN_LOCATION; | |
5772 | while (*list != cdw_number_of_elements) | |
5773 | { | |
5774 | location_t newloc = locations[*list]; | |
5775 | if (loc == UNKNOWN_LOCATION | |
5776 | || (newloc != UNKNOWN_LOCATION && newloc < loc)) | |
5777 | loc = newloc; | |
5778 | list++; | |
5779 | } | |
5780 | ||
5781 | return loc; | |
5782 | } | |
5783 | ||
51e29401 RS |
5784 | /* Given declspecs and a declarator, |
5785 | determine the name and type of the object declared | |
5786 | and construct a ..._DECL node for it. | |
5787 | (In one case we can return a ..._TYPE node instead. | |
6574d78e | 5788 | For invalid input we sometimes return NULL_TREE.) |
51e29401 | 5789 | |
deb176fa | 5790 | DECLSPECS is a c_declspecs structure for the declaration specifiers. |
51e29401 RS |
5791 | |
5792 | DECL_CONTEXT says which syntactic context this declaration is in: | |
5793 | NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL. | |
5794 | FUNCDEF for a function definition. Like NORMAL but a few different | |
5795 | error messages in each case. Return value may be zero meaning | |
5796 | this definition is too screwy to try to parse. | |
5797 | PARM for a parameter declaration (either within a function prototype | |
5798 | or before a function body). Make a PARM_DECL, or return void_type_node. | |
5799 | TYPENAME if for a typename (in a cast or sizeof). | |
5800 | Don't make a DECL node; just return the ..._TYPE node. | |
5801 | FIELD for a struct or union field; make a FIELD_DECL. | |
60919bce | 5802 | INITIALIZED is true if the decl has an initializer. |
2ff7cce4 JM |
5803 | WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node |
5804 | representing the width of the bit-field. | |
b9baeecd RS |
5805 | DECL_ATTRS points to the list of attributes that should be added to this |
5806 | decl. Any nested attributes that belong on the decl itself will be | |
5807 | added to this list. | |
928c19bb JM |
5808 | If EXPR is not NULL, any expressions that need to be evaluated as |
5809 | part of evaluating variably modified types will be stored in *EXPR. | |
5810 | If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be | |
5811 | set to indicate whether operands in *EXPR can be used in constant | |
5812 | expressions. | |
0da300cd TT |
5813 | DEPRECATED_STATE is a deprecated_states value indicating whether |
5814 | deprecation warnings should be suppressed. | |
51e29401 RS |
5815 | |
5816 | In the TYPENAME case, DECLARATOR is really an absolute declarator. | |
5817 | It may also be so in the PARM case, for a prototype where the | |
5818 | argument type is specified but not the name. | |
5819 | ||
5820 | This function is where the complicated C meanings of `static' | |
929f3671 | 5821 | and `extern' are interpreted. */ |
51e29401 RS |
5822 | |
5823 | static tree | |
deb176fa JM |
5824 | grokdeclarator (const struct c_declarator *declarator, |
5825 | struct c_declspecs *declspecs, | |
0da300cd | 5826 | enum decl_context decl_context, bool initialized, tree *width, |
928c19bb JM |
5827 | tree *decl_attrs, tree *expr, bool *expr_const_operands, |
5828 | enum deprecated_states deprecated_state) | |
51e29401 | 5829 | { |
deb176fa | 5830 | tree type = declspecs->type; |
9a26d6ee JM |
5831 | bool threadp = declspecs->thread_p; |
5832 | enum c_storage_class storage_class = declspecs->storage_class; | |
51e29401 | 5833 | int constp; |
3932261a | 5834 | int restrictp; |
51e29401 | 5835 | int volatilep; |
267bac10 | 5836 | int atomicp; |
3932261a | 5837 | int type_quals = TYPE_UNQUALIFIED; |
88388a52 | 5838 | tree name = NULL_TREE; |
52ffd86e | 5839 | bool funcdef_flag = false; |
f8893e47 | 5840 | bool funcdef_syntax = false; |
f9551830 | 5841 | bool size_varies = false; |
98c3a782 | 5842 | tree decl_attr = declspecs->decl_attr; |
3b53cddc JM |
5843 | int array_ptr_quals = TYPE_UNQUALIFIED; |
5844 | tree array_ptr_attrs = NULL_TREE; | |
e3455240 | 5845 | bool array_parm_static = false; |
52ffd86e | 5846 | bool array_parm_vla_unspec_p = false; |
91d231cb | 5847 | tree returned_attrs = NULL_TREE; |
2ff7cce4 | 5848 | bool bitfield = width != NULL; |
85b58ca5 | 5849 | tree element_type; |
e9e32ee6 JM |
5850 | tree orig_qual_type = NULL; |
5851 | size_t orig_qual_indirect = 0; | |
f8893e47 | 5852 | struct c_arg_info *arg_info = 0; |
36c5e70a | 5853 | addr_space_t as1, as2, address_space; |
c2255bc4 | 5854 | location_t loc = UNKNOWN_LOCATION; |
928c19bb JM |
5855 | tree expr_dummy; |
5856 | bool expr_const_operands_dummy; | |
411cdbd8 | 5857 | enum c_declarator_kind first_non_attr_kind; |
d19fa6b5 | 5858 | unsigned int alignas_align = 0; |
928c19bb | 5859 | |
29ce73cb PB |
5860 | if (TREE_CODE (type) == ERROR_MARK) |
5861 | return error_mark_node; | |
928c19bb | 5862 | if (expr == NULL) |
d17680f3 JJ |
5863 | { |
5864 | expr = &expr_dummy; | |
5865 | expr_dummy = NULL_TREE; | |
5866 | } | |
928c19bb JM |
5867 | if (expr_const_operands == NULL) |
5868 | expr_const_operands = &expr_const_operands_dummy; | |
5869 | ||
d17680f3 JJ |
5870 | if (declspecs->expr) |
5871 | { | |
5872 | if (*expr) | |
5873 | *expr = build2 (COMPOUND_EXPR, TREE_TYPE (declspecs->expr), *expr, | |
5874 | declspecs->expr); | |
5875 | else | |
5876 | *expr = declspecs->expr; | |
5877 | } | |
928c19bb | 5878 | *expr_const_operands = declspecs->expr_const_operands; |
51e29401 RS |
5879 | |
5880 | if (decl_context == FUNCDEF) | |
52ffd86e | 5881 | funcdef_flag = true, decl_context = NORMAL; |
51e29401 | 5882 | |
51e29401 | 5883 | /* Look inside a declarator for the name being declared |
88388a52 | 5884 | and get it as an IDENTIFIER_NODE, for an error message. */ |
51e29401 | 5885 | { |
f8893e47 | 5886 | const struct c_declarator *decl = declarator; |
51e29401 | 5887 | |
411cdbd8 | 5888 | first_non_attr_kind = cdk_attrs; |
51e29401 | 5889 | while (decl) |
f8893e47 | 5890 | switch (decl->kind) |
51e29401 | 5891 | { |
f8893e47 | 5892 | case cdk_array: |
c2255bc4 AH |
5893 | loc = decl->id_loc; |
5894 | /* FALL THRU. */ | |
5895 | ||
5896 | case cdk_function: | |
f8893e47 JM |
5897 | case cdk_pointer: |
5898 | funcdef_syntax = (decl->kind == cdk_function); | |
411cdbd8 RG |
5899 | if (first_non_attr_kind == cdk_attrs) |
5900 | first_non_attr_kind = decl->kind; | |
e9e32ee6 | 5901 | decl = decl->declarator; |
51e29401 RS |
5902 | break; |
5903 | ||
f8893e47 JM |
5904 | case cdk_attrs: |
5905 | decl = decl->declarator; | |
91d231cb JM |
5906 | break; |
5907 | ||
f8893e47 | 5908 | case cdk_id: |
c2255bc4 | 5909 | loc = decl->id_loc; |
f8893e47 | 5910 | if (decl->u.id) |
88388a52 | 5911 | name = decl->u.id; |
411cdbd8 RG |
5912 | if (first_non_attr_kind == cdk_attrs) |
5913 | first_non_attr_kind = decl->kind; | |
51e29401 RS |
5914 | decl = 0; |
5915 | break; | |
5916 | ||
5917 | default: | |
366de0ce | 5918 | gcc_unreachable (); |
51e29401 | 5919 | } |
3fa8871b | 5920 | if (name == NULL_TREE) |
88388a52 JM |
5921 | { |
5922 | gcc_assert (decl_context == PARM | |
5923 | || decl_context == TYPENAME | |
5924 | || (decl_context == FIELD | |
5925 | && declarator->kind == cdk_id)); | |
5926 | gcc_assert (!initialized); | |
5927 | } | |
51e29401 RS |
5928 | } |
5929 | ||
5930 | /* A function definition's declarator must have the form of | |
5931 | a function declarator. */ | |
5932 | ||
f8893e47 | 5933 | if (funcdef_flag && !funcdef_syntax) |
6574d78e | 5934 | return NULL_TREE; |
51e29401 | 5935 | |
51e29401 RS |
5936 | /* If this looks like a function definition, make it one, |
5937 | even if it occurs where parms are expected. | |
5938 | Then store_parm_decls will reject it and not use it as a parm. */ | |
f75fbaf7 | 5939 | if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag) |
51e29401 RS |
5940 | decl_context = PARM; |
5941 | ||
deb176fa | 5942 | if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS) |
9b86d6bb | 5943 | warn_deprecated_use (declspecs->type, declspecs->decl_attr); |
51e29401 | 5944 | |
5c076987 JM |
5945 | if ((decl_context == NORMAL || decl_context == FIELD) |
5946 | && current_scope == file_scope | |
5947 | && variably_modified_type_p (type, NULL_TREE)) | |
5948 | { | |
88388a52 | 5949 | if (name) |
c2255bc4 | 5950 | error_at (loc, "variably modified %qE at file scope", name); |
88388a52 | 5951 | else |
c2255bc4 | 5952 | error_at (loc, "variably modified field at file scope"); |
5c076987 JM |
5953 | type = integer_type_node; |
5954 | } | |
5955 | ||
f9551830 | 5956 | size_varies = C_TYPE_VARIABLE_SIZE (type) != 0; |
51e29401 | 5957 | |
98c3a782 | 5958 | /* Diagnose defaulting to "int". */ |
720283f2 | 5959 | |
8400e75e | 5960 | if (declspecs->default_int_p && !in_system_header_at (input_location)) |
51e29401 | 5961 | { |
98c3a782 JM |
5962 | /* Issue a warning if this is an ISO C 99 program or if |
5963 | -Wreturn-type and this is a function, or if -Wimplicit; | |
5964 | prefer the former warning since it is more explicit. */ | |
b67b9225 | 5965 | if ((warn_implicit_int || warn_return_type > 0 || flag_isoc99) |
98c3a782 JM |
5966 | && funcdef_flag) |
5967 | warn_about_return_type = 1; | |
88388a52 JM |
5968 | else |
5969 | { | |
5970 | if (name) | |
92574c7c | 5971 | warn_defaults_to (loc, OPT_Wimplicit_int, |
35aff4fb MP |
5972 | "type defaults to %<int%> in declaration " |
5973 | "of %qE", name); | |
88388a52 | 5974 | else |
92574c7c | 5975 | warn_defaults_to (loc, OPT_Wimplicit_int, |
35aff4fb | 5976 | "type defaults to %<int%> in type name"); |
88388a52 | 5977 | } |
51e29401 RS |
5978 | } |
5979 | ||
98c3a782 JM |
5980 | /* Adjust the type if a bit-field is being declared, |
5981 | -funsigned-bitfields applied and the type is not explicitly | |
5982 | "signed". */ | |
5983 | if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p | |
5984 | && TREE_CODE (type) == INTEGER_TYPE) | |
726a989a | 5985 | type = unsigned_type_for (type); |
51e29401 | 5986 | |
3932261a MM |
5987 | /* Figure out the type qualifiers for the declaration. There are |
5988 | two ways a declaration can become qualified. One is something | |
5989 | like `const int i' where the `const' is explicit. Another is | |
5990 | something like `typedef const int CI; CI i' where the type of the | |
85b58ca5 JM |
5991 | declaration contains the `const'. A third possibility is that |
5992 | there is a type qualifier on the element type of a typedefed | |
5993 | array type, in which case we should extract that qualifier so | |
5f04ff80 | 5994 | that c_apply_type_quals_to_decl receives the full list of |
85b58ca5 JM |
5995 | qualifiers to work with (C90 is not entirely clear about whether |
5996 | duplicate qualifiers should be diagnosed in this case, but it | |
5997 | seems most appropriate to do so). */ | |
5998 | element_type = strip_array_types (type); | |
3b53cddc JM |
5999 | constp = declspecs->const_p + TYPE_READONLY (element_type); |
6000 | restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type); | |
6001 | volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type); | |
267bac10 | 6002 | atomicp = declspecs->atomic_p + TYPE_ATOMIC (element_type); |
36c5e70a BE |
6003 | as1 = declspecs->address_space; |
6004 | as2 = TYPE_ADDR_SPACE (element_type); | |
6005 | address_space = ADDR_SPACE_GENERIC_P (as1)? as2 : as1; | |
6006 | ||
f3bede71 MP |
6007 | if (constp > 1) |
6008 | pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<const%>"); | |
6009 | if (restrictp > 1) | |
6010 | pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<restrict%>"); | |
6011 | if (volatilep > 1) | |
6012 | pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<volatile%>"); | |
6013 | if (atomicp > 1) | |
6014 | pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<_Atomic%>"); | |
36c5e70a BE |
6015 | |
6016 | if (!ADDR_SPACE_GENERIC_P (as1) && !ADDR_SPACE_GENERIC_P (as2) && as1 != as2) | |
6017 | error_at (loc, "conflicting named address spaces (%s vs %s)", | |
6018 | c_addr_space_name (as1), c_addr_space_name (as2)); | |
6019 | ||
411cdbd8 RG |
6020 | if ((TREE_CODE (type) == ARRAY_TYPE |
6021 | || first_non_attr_kind == cdk_array) | |
6022 | && TYPE_QUALS (element_type)) | |
e9e32ee6 JM |
6023 | { |
6024 | orig_qual_type = type; | |
6025 | type = TYPE_MAIN_VARIANT (type); | |
6026 | } | |
3932261a MM |
6027 | type_quals = ((constp ? TYPE_QUAL_CONST : 0) |
6028 | | (restrictp ? TYPE_QUAL_RESTRICT : 0) | |
36c5e70a | 6029 | | (volatilep ? TYPE_QUAL_VOLATILE : 0) |
267bac10 | 6030 | | (atomicp ? TYPE_QUAL_ATOMIC : 0) |
36c5e70a | 6031 | | ENCODE_QUAL_ADDR_SPACE (address_space)); |
e9e32ee6 JM |
6032 | if (type_quals != TYPE_QUALS (element_type)) |
6033 | orig_qual_type = NULL_TREE; | |
51e29401 | 6034 | |
267bac10 JM |
6035 | /* Applying the _Atomic qualifier to an array type (through the use |
6036 | of typedefs or typeof) must be detected here. If the qualifier | |
6037 | is introduced later, any appearance of applying it to an array is | |
6038 | actually applying it to an element of that array. */ | |
49e6a6c0 | 6039 | if (declspecs->atomic_p && TREE_CODE (type) == ARRAY_TYPE) |
267bac10 JM |
6040 | error_at (loc, "%<_Atomic%>-qualified array type"); |
6041 | ||
9a26d6ee JM |
6042 | /* Warn about storage classes that are invalid for certain |
6043 | kinds of declarations (parameters, typenames, etc.). */ | |
6044 | ||
6045 | if (funcdef_flag | |
6046 | && (threadp | |
6047 | || storage_class == csc_auto | |
6048 | || storage_class == csc_register | |
6049 | || storage_class == csc_typedef)) | |
6050 | { | |
fcf73884 | 6051 | if (storage_class == csc_auto) |
b8698a0f | 6052 | pedwarn (loc, |
c1771a20 | 6053 | (current_scope == file_scope) ? 0 : OPT_Wpedantic, |
fcf73884 | 6054 | "function definition declared %<auto%>"); |
9a26d6ee | 6055 | if (storage_class == csc_register) |
c2255bc4 | 6056 | error_at (loc, "function definition declared %<register%>"); |
9a26d6ee | 6057 | if (storage_class == csc_typedef) |
c2255bc4 | 6058 | error_at (loc, "function definition declared %<typedef%>"); |
9a26d6ee | 6059 | if (threadp) |
582d9b50 JM |
6060 | error_at (loc, "function definition declared %qs", |
6061 | declspecs->thread_gnu_p ? "__thread" : "_Thread_local"); | |
9a26d6ee JM |
6062 | threadp = false; |
6063 | if (storage_class == csc_auto | |
6064 | || storage_class == csc_register | |
6065 | || storage_class == csc_typedef) | |
6066 | storage_class = csc_none; | |
6067 | } | |
6068 | else if (decl_context != NORMAL && (storage_class != csc_none || threadp)) | |
6069 | { | |
6070 | if (decl_context == PARM && storage_class == csc_register) | |
6071 | ; | |
6072 | else | |
6073 | { | |
6074 | switch (decl_context) | |
6075 | { | |
6076 | case FIELD: | |
88388a52 | 6077 | if (name) |
c2255bc4 AH |
6078 | error_at (loc, "storage class specified for structure " |
6079 | "field %qE", name); | |
88388a52 | 6080 | else |
c2255bc4 | 6081 | error_at (loc, "storage class specified for structure field"); |
9a26d6ee JM |
6082 | break; |
6083 | case PARM: | |
88388a52 | 6084 | if (name) |
c2255bc4 AH |
6085 | error_at (loc, "storage class specified for parameter %qE", |
6086 | name); | |
88388a52 | 6087 | else |
c2255bc4 | 6088 | error_at (loc, "storage class specified for unnamed parameter"); |
9a26d6ee JM |
6089 | break; |
6090 | default: | |
c2255bc4 | 6091 | error_at (loc, "storage class specified for typename"); |
9a26d6ee JM |
6092 | break; |
6093 | } | |
6094 | storage_class = csc_none; | |
6095 | threadp = false; | |
6096 | } | |
6097 | } | |
6098 | else if (storage_class == csc_extern | |
6099 | && initialized | |
6100 | && !funcdef_flag) | |
6101 | { | |
6102 | /* 'extern' with initialization is invalid if not at file scope. */ | |
b8b47f42 GDR |
6103 | if (current_scope == file_scope) |
6104 | { | |
6105 | /* It is fine to have 'extern const' when compiling at C | |
6106 | and C++ intersection. */ | |
6107 | if (!(warn_cxx_compat && constp)) | |
c2255bc4 AH |
6108 | warning_at (loc, 0, "%qE initialized and declared %<extern%>", |
6109 | name); | |
b8b47f42 | 6110 | } |
9a26d6ee | 6111 | else |
c2255bc4 | 6112 | error_at (loc, "%qE has both %<extern%> and initializer", name); |
9a26d6ee JM |
6113 | } |
6114 | else if (current_scope == file_scope) | |
6115 | { | |
6116 | if (storage_class == csc_auto) | |
c2255bc4 AH |
6117 | error_at (loc, "file-scope declaration of %qE specifies %<auto%>", |
6118 | name); | |
9a26d6ee | 6119 | if (pedantic && storage_class == csc_register) |
c1771a20 | 6120 | pedwarn (input_location, OPT_Wpedantic, |
88388a52 | 6121 | "file-scope declaration of %qE specifies %<register%>", name); |
9a26d6ee JM |
6122 | } |
6123 | else | |
6124 | { | |
6125 | if (storage_class == csc_extern && funcdef_flag) | |
c2255bc4 | 6126 | error_at (loc, "nested function %qE declared %<extern%>", name); |
9a26d6ee JM |
6127 | else if (threadp && storage_class == csc_none) |
6128 | { | |
c2255bc4 | 6129 | error_at (loc, "function-scope %qE implicitly auto and declared " |
582d9b50 JM |
6130 | "%qs", name, |
6131 | declspecs->thread_gnu_p ? "__thread" : "_Thread_local"); | |
9a26d6ee JM |
6132 | threadp = false; |
6133 | } | |
6134 | } | |
51e29401 RS |
6135 | |
6136 | /* Now figure out the structure of the declarator proper. | |
6137 | Descend through it, creating more complex types, until we reach | |
46df2823 JM |
6138 | the declared identifier (or NULL_TREE, in an absolute declarator). |
6139 | At each stage we maintain an unqualified version of the type | |
6140 | together with any qualifiers that should be applied to it with | |
6141 | c_build_qualified_type; this way, array types including | |
6142 | multidimensional array types are first built up in unqualified | |
6143 | form and then the qualified form is created with | |
6144 | TYPE_MAIN_VARIANT pointing to the unqualified form. */ | |
51e29401 | 6145 | |
f8893e47 | 6146 | while (declarator && declarator->kind != cdk_id) |
51e29401 RS |
6147 | { |
6148 | if (type == error_mark_node) | |
6149 | { | |
f8893e47 | 6150 | declarator = declarator->declarator; |
51e29401 RS |
6151 | continue; |
6152 | } | |
6153 | ||
f8893e47 JM |
6154 | /* Each level of DECLARATOR is either a cdk_array (for ...[..]), |
6155 | a cdk_pointer (for *...), | |
6156 | a cdk_function (for ...(...)), | |
6157 | a cdk_attrs (for nested attributes), | |
6158 | or a cdk_id (for the name being declared | |
6159 | or the place in an absolute declarator | |
51e29401 | 6160 | where the name was omitted). |
f8893e47 | 6161 | For the last case, we have just exited the loop. |
51e29401 RS |
6162 | |
6163 | At this point, TYPE is the type of elements of an array, | |
6164 | or for a function to return, or for a pointer to point to. | |
6165 | After this sequence of ifs, TYPE is the type of the | |
6166 | array or function or pointer, and DECLARATOR has had its | |
6167 | outermost layer removed. */ | |
6168 | ||
3b53cddc JM |
6169 | if (array_ptr_quals != TYPE_UNQUALIFIED |
6170 | || array_ptr_attrs != NULL_TREE | |
6171 | || array_parm_static) | |
0e03329a JM |
6172 | { |
6173 | /* Only the innermost declarator (making a parameter be of | |
6174 | array type which is converted to pointer type) | |
6175 | may have static or type qualifiers. */ | |
c2255bc4 | 6176 | error_at (loc, "static or type qualifiers in non-parameter array declarator"); |
3b53cddc JM |
6177 | array_ptr_quals = TYPE_UNQUALIFIED; |
6178 | array_ptr_attrs = NULL_TREE; | |
e3455240 | 6179 | array_parm_static = false; |
0e03329a JM |
6180 | } |
6181 | ||
f8893e47 | 6182 | switch (declarator->kind) |
51e29401 | 6183 | { |
f8893e47 | 6184 | case cdk_attrs: |
366de0ce | 6185 | { |
f8893e47 JM |
6186 | /* A declarator with embedded attributes. */ |
6187 | tree attrs = declarator->u.attrs; | |
6188 | const struct c_declarator *inner_decl; | |
366de0ce | 6189 | int attr_flags = 0; |
f8893e47 | 6190 | declarator = declarator->declarator; |
366de0ce | 6191 | inner_decl = declarator; |
f8893e47 JM |
6192 | while (inner_decl->kind == cdk_attrs) |
6193 | inner_decl = inner_decl->declarator; | |
6194 | if (inner_decl->kind == cdk_id) | |
366de0ce | 6195 | attr_flags |= (int) ATTR_FLAG_DECL_NEXT; |
f8893e47 | 6196 | else if (inner_decl->kind == cdk_function) |
366de0ce | 6197 | attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT; |
f8893e47 | 6198 | else if (inner_decl->kind == cdk_array) |
366de0ce NS |
6199 | attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT; |
6200 | returned_attrs = decl_attributes (&type, | |
6201 | chainon (returned_attrs, attrs), | |
6202 | attr_flags); | |
6203 | break; | |
6204 | } | |
f8893e47 | 6205 | case cdk_array: |
366de0ce NS |
6206 | { |
6207 | tree itype = NULL_TREE; | |
f8893e47 | 6208 | tree size = declarator->u.array.dimen; |
366de0ce NS |
6209 | /* The index is a signed object `sizetype' bits wide. */ |
6210 | tree index_type = c_common_signed_type (sizetype); | |
6211 | ||
f8893e47 | 6212 | array_ptr_quals = declarator->u.array.quals; |
3b53cddc | 6213 | array_ptr_attrs = declarator->u.array.attrs; |
f8893e47 | 6214 | array_parm_static = declarator->u.array.static_p; |
52ffd86e MS |
6215 | array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p; |
6216 | ||
f8893e47 | 6217 | declarator = declarator->declarator; |
366de0ce NS |
6218 | |
6219 | /* Check for some types that there cannot be arrays of. */ | |
c22cacf3 | 6220 | |
366de0ce NS |
6221 | if (VOID_TYPE_P (type)) |
6222 | { | |
88388a52 | 6223 | if (name) |
c2255bc4 | 6224 | error_at (loc, "declaration of %qE as array of voids", name); |
88388a52 | 6225 | else |
c2255bc4 | 6226 | error_at (loc, "declaration of type name as array of voids"); |
366de0ce NS |
6227 | type = error_mark_node; |
6228 | } | |
c22cacf3 | 6229 | |
366de0ce NS |
6230 | if (TREE_CODE (type) == FUNCTION_TYPE) |
6231 | { | |
88388a52 | 6232 | if (name) |
c2255bc4 AH |
6233 | error_at (loc, "declaration of %qE as array of functions", |
6234 | name); | |
88388a52 | 6235 | else |
c2255bc4 AH |
6236 | error_at (loc, "declaration of type name as array of " |
6237 | "functions"); | |
366de0ce NS |
6238 | type = error_mark_node; |
6239 | } | |
c22cacf3 | 6240 | |
8400e75e DM |
6241 | if (pedantic && !in_system_header_at (input_location) |
6242 | && flexible_array_type_p (type)) | |
c1771a20 | 6243 | pedwarn (loc, OPT_Wpedantic, |
509c9d60 | 6244 | "invalid use of structure with flexible array member"); |
c22cacf3 | 6245 | |
366de0ce | 6246 | if (size == error_mark_node) |
51e29401 | 6247 | type = error_mark_node; |
c22cacf3 | 6248 | |
366de0ce NS |
6249 | if (type == error_mark_node) |
6250 | continue; | |
e9a25f70 | 6251 | |
366de0ce NS |
6252 | /* If size was specified, set ITYPE to a range-type for |
6253 | that size. Otherwise, ITYPE remains null. finish_decl | |
6254 | may figure it out from an initial value. */ | |
a25f1211 | 6255 | |
366de0ce NS |
6256 | if (size) |
6257 | { | |
928c19bb JM |
6258 | bool size_maybe_const = true; |
6259 | bool size_int_const = (TREE_CODE (size) == INTEGER_CST | |
6260 | && !TREE_OVERFLOW (size)); | |
6261 | bool this_size_varies = false; | |
6262 | ||
366de0ce NS |
6263 | /* Strip NON_LVALUE_EXPRs since we aren't using as an |
6264 | lvalue. */ | |
6265 | STRIP_TYPE_NOPS (size); | |
c22cacf3 | 6266 | |
3f75a254 | 6267 | if (!INTEGRAL_TYPE_P (TREE_TYPE (size))) |
366de0ce | 6268 | { |
88388a52 | 6269 | if (name) |
c2255bc4 | 6270 | error_at (loc, "size of array %qE has non-integer type", |
7176a4a0 | 6271 | name); |
88388a52 | 6272 | else |
c2255bc4 | 6273 | error_at (loc, |
7176a4a0 MP |
6274 | "size of unnamed array has non-integer type"); |
6275 | size = integer_one_node; | |
6276 | } | |
6277 | /* This can happen with enum forward declaration. */ | |
6278 | else if (!COMPLETE_TYPE_P (TREE_TYPE (size))) | |
6279 | { | |
6280 | if (name) | |
6281 | error_at (loc, "size of array %qE has incomplete type", | |
6282 | name); | |
6283 | else | |
6284 | error_at (loc, "size of unnamed array has incomplete " | |
6285 | "type"); | |
366de0ce NS |
6286 | size = integer_one_node; |
6287 | } | |
c22cacf3 | 6288 | |
928c19bb JM |
6289 | size = c_fully_fold (size, false, &size_maybe_const); |
6290 | ||
6291 | if (pedantic && size_maybe_const && integer_zerop (size)) | |
88388a52 JM |
6292 | { |
6293 | if (name) | |
c1771a20 | 6294 | pedwarn (loc, OPT_Wpedantic, |
88388a52 JM |
6295 | "ISO C forbids zero-size array %qE", name); |
6296 | else | |
c1771a20 | 6297 | pedwarn (loc, OPT_Wpedantic, |
88388a52 JM |
6298 | "ISO C forbids zero-size array"); |
6299 | } | |
c22cacf3 | 6300 | |
928c19bb | 6301 | if (TREE_CODE (size) == INTEGER_CST && size_maybe_const) |
366de0ce NS |
6302 | { |
6303 | constant_expression_warning (size); | |
6304 | if (tree_int_cst_sgn (size) < 0) | |
6305 | { | |
88388a52 | 6306 | if (name) |
c2255bc4 | 6307 | error_at (loc, "size of array %qE is negative", name); |
88388a52 | 6308 | else |
c2255bc4 | 6309 | error_at (loc, "size of unnamed array is negative"); |
366de0ce NS |
6310 | size = integer_one_node; |
6311 | } | |
928c19bb JM |
6312 | /* Handle a size folded to an integer constant but |
6313 | not an integer constant expression. */ | |
6314 | if (!size_int_const) | |
6315 | { | |
6ccb2a4a JM |
6316 | /* If this is a file scope declaration of an |
6317 | ordinary identifier, this is invalid code; | |
6318 | diagnosing it here and not subsequently | |
6319 | treating the type as variable-length avoids | |
6320 | more confusing diagnostics later. */ | |
6321 | if ((decl_context == NORMAL || decl_context == FIELD) | |
6322 | && current_scope == file_scope) | |
6323 | pedwarn (input_location, 0, | |
88388a52 JM |
6324 | "variably modified %qE at file scope", |
6325 | name); | |
6ccb2a4a | 6326 | else |
f9551830 | 6327 | this_size_varies = size_varies = true; |
88388a52 | 6328 | warn_variable_length_array (name, size); |
928c19bb | 6329 | } |
366de0ce | 6330 | } |
5c076987 JM |
6331 | else if ((decl_context == NORMAL || decl_context == FIELD) |
6332 | && current_scope == file_scope) | |
6333 | { | |
c2255bc4 | 6334 | error_at (loc, "variably modified %qE at file scope", name); |
5c076987 JM |
6335 | size = integer_one_node; |
6336 | } | |
366de0ce NS |
6337 | else |
6338 | { | |
6339 | /* Make sure the array size remains visibly | |
6340 | nonconstant even if it is (eg) a const variable | |
6341 | with known value. */ | |
f9551830 | 6342 | this_size_varies = size_varies = true; |
88388a52 | 6343 | warn_variable_length_array (name, size); |
45b2222a | 6344 | if (sanitize_flags_p (SANITIZE_VLA) |
f34ebeb2 | 6345 | && current_function_decl != NULL_TREE |
45b2222a | 6346 | && decl_context == NORMAL) |
b906f4ca MP |
6347 | { |
6348 | /* Evaluate the array size only once. */ | |
b2fa0a8b | 6349 | size = save_expr (size); |
b906f4ca MP |
6350 | size = c_fully_fold (size, false, NULL); |
6351 | size = fold_build2 (COMPOUND_EXPR, TREE_TYPE (size), | |
6352 | ubsan_instrument_vla (loc, size), | |
6353 | size); | |
6354 | } | |
366de0ce | 6355 | } |
51e29401 | 6356 | |
928c19bb | 6357 | if (integer_zerop (size) && !this_size_varies) |
366de0ce | 6358 | { |
c22cacf3 MS |
6359 | /* A zero-length array cannot be represented with |
6360 | an unsigned index type, which is what we'll | |
6361 | get with build_index_type. Create an | |
6362 | open-ended range instead. */ | |
366de0ce NS |
6363 | itype = build_range_type (sizetype, size, NULL_TREE); |
6364 | } | |
6365 | else | |
6366 | { | |
8b0b9aef RH |
6367 | /* Arrange for the SAVE_EXPR on the inside of the |
6368 | MINUS_EXPR, which allows the -1 to get folded | |
6369 | with the +1 that happens when building TYPE_SIZE. */ | |
6370 | if (size_varies) | |
a04a722b | 6371 | size = save_expr (size); |
928c19bb JM |
6372 | if (this_size_varies && TREE_CODE (size) == INTEGER_CST) |
6373 | size = build2 (COMPOUND_EXPR, TREE_TYPE (size), | |
6374 | integer_zero_node, size); | |
8b0b9aef | 6375 | |
366de0ce NS |
6376 | /* Compute the maximum valid index, that is, size |
6377 | - 1. Do the calculation in index_type, so that | |
6378 | if it is a variable the computations will be | |
6379 | done in the proper mode. */ | |
db3927fb AH |
6380 | itype = fold_build2_loc (loc, MINUS_EXPR, index_type, |
6381 | convert (index_type, size), | |
6382 | convert (index_type, | |
6383 | size_one_node)); | |
366de0ce | 6384 | |
60a45536 RG |
6385 | /* The above overflows when size does not fit |
6386 | in index_type. | |
6387 | ??? While a size of INT_MAX+1 technically shouldn't | |
6388 | cause an overflow (because we subtract 1), handling | |
6389 | this case seems like an unnecessary complication. */ | |
6390 | if (TREE_CODE (size) == INTEGER_CST | |
6391 | && !int_fits_type_p (size, index_type)) | |
366de0ce | 6392 | { |
88388a52 | 6393 | if (name) |
c2255bc4 AH |
6394 | error_at (loc, "size of array %qE is too large", |
6395 | name); | |
88388a52 | 6396 | else |
c2255bc4 | 6397 | error_at (loc, "size of unnamed array is too large"); |
366de0ce NS |
6398 | type = error_mark_node; |
6399 | continue; | |
6400 | } | |
c22cacf3 | 6401 | |
366de0ce NS |
6402 | itype = build_index_type (itype); |
6403 | } | |
928c19bb JM |
6404 | if (this_size_varies) |
6405 | { | |
6406 | if (*expr) | |
6407 | *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size), | |
6408 | *expr, size); | |
6409 | else | |
6410 | *expr = size; | |
6411 | *expr_const_operands &= size_maybe_const; | |
6412 | } | |
366de0ce NS |
6413 | } |
6414 | else if (decl_context == FIELD) | |
6415 | { | |
1de2c900 | 6416 | bool flexible_array_member = false; |
062c4bb3 JM |
6417 | if (array_parm_vla_unspec_p) |
6418 | /* Field names can in fact have function prototype | |
6419 | scope so [*] is disallowed here through making | |
6420 | the field variably modified, not through being | |
6421 | something other than a declaration with function | |
6422 | prototype scope. */ | |
f9551830 | 6423 | size_varies = true; |
1de2c900 JM |
6424 | else |
6425 | { | |
6426 | const struct c_declarator *t = declarator; | |
6427 | while (t->kind == cdk_attrs) | |
6428 | t = t->declarator; | |
6429 | flexible_array_member = (t->kind == cdk_id); | |
6430 | } | |
6431 | if (flexible_array_member | |
8400e75e | 6432 | && !in_system_header_at (input_location)) |
f3bede71 MP |
6433 | pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not " |
6434 | "support flexible array members"); | |
c7b82833 | 6435 | |
366de0ce NS |
6436 | /* ISO C99 Flexible array members are effectively |
6437 | identical to GCC's zero-length array extension. */ | |
1de2c900 JM |
6438 | if (flexible_array_member || array_parm_vla_unspec_p) |
6439 | itype = build_range_type (sizetype, size_zero_node, | |
6440 | NULL_TREE); | |
366de0ce | 6441 | } |
52ffd86e MS |
6442 | else if (decl_context == PARM) |
6443 | { | |
6444 | if (array_parm_vla_unspec_p) | |
6445 | { | |
52ffd86e | 6446 | itype = build_range_type (sizetype, size_zero_node, NULL_TREE); |
f9551830 | 6447 | size_varies = true; |
52ffd86e MS |
6448 | } |
6449 | } | |
8d9f82d5 AO |
6450 | else if (decl_context == TYPENAME) |
6451 | { | |
6452 | if (array_parm_vla_unspec_p) | |
6453 | { | |
062c4bb3 JM |
6454 | /* C99 6.7.5.2p4 */ |
6455 | warning (0, "%<[*]%> not in a declaration"); | |
6456 | /* We use this to avoid messing up with incomplete | |
6457 | array types of the same type, that would | |
6458 | otherwise be modified below. */ | |
8d9f82d5 AO |
6459 | itype = build_range_type (sizetype, size_zero_node, |
6460 | NULL_TREE); | |
f9551830 | 6461 | size_varies = true; |
8d9f82d5 AO |
6462 | } |
6463 | } | |
51e29401 | 6464 | |
636b4106 | 6465 | /* Complain about arrays of incomplete types. */ |
b4519d39 SB |
6466 | if (!COMPLETE_TYPE_P (type)) |
6467 | { | |
e5d9235b MP |
6468 | error_at (loc, "array type has incomplete element type %qT", |
6469 | type); | |
00083992 MP |
6470 | /* See if we can be more helpful. */ |
6471 | if (TREE_CODE (type) == ARRAY_TYPE) | |
6472 | { | |
6473 | if (name) | |
6474 | inform (loc, "declaration of %qE as multidimensional " | |
6475 | "array must have bounds for all dimensions " | |
6476 | "except the first", name); | |
6477 | else | |
6478 | inform (loc, "declaration of multidimensional array " | |
6479 | "must have bounds for all dimensions except " | |
6480 | "the first"); | |
6481 | } | |
c22cacf3 | 6482 | type = error_mark_node; |
b4519d39 SB |
6483 | } |
6484 | else | |
8d9f82d5 AO |
6485 | /* When itype is NULL, a shared incomplete array type is |
6486 | returned for all array of a given type. Elsewhere we | |
6487 | make sure we don't complete that type before copying | |
6488 | it, but here we want to make sure we don't ever | |
6489 | modify the shared type, so we gcc_assert (itype) | |
6490 | below. */ | |
36c5e70a BE |
6491 | { |
6492 | addr_space_t as = DECODE_QUAL_ADDR_SPACE (type_quals); | |
6493 | if (!ADDR_SPACE_GENERIC_P (as) && as != TYPE_ADDR_SPACE (type)) | |
6494 | type = build_qualified_type (type, | |
6495 | ENCODE_QUAL_ADDR_SPACE (as)); | |
6496 | ||
6497 | type = build_array_type (type, itype); | |
6498 | } | |
51e29401 | 6499 | |
9df594d7 | 6500 | if (type != error_mark_node) |
366de0ce | 6501 | { |
9df594d7 | 6502 | if (size_varies) |
5c076987 | 6503 | { |
8d9f82d5 AO |
6504 | /* It is ok to modify type here even if itype is |
6505 | NULL: if size_varies, we're in a | |
96ff6c8c | 6506 | multi-dimensional array and the inner type has |
8d9f82d5 AO |
6507 | variable size, so the enclosing shared array type |
6508 | must too. */ | |
5c076987 JM |
6509 | if (size && TREE_CODE (size) == INTEGER_CST) |
6510 | type | |
6511 | = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); | |
6512 | C_TYPE_VARIABLE_SIZE (type) = 1; | |
6513 | } | |
9df594d7 RG |
6514 | |
6515 | /* The GCC extension for zero-length arrays differs from | |
6516 | ISO flexible array members in that sizeof yields | |
6517 | zero. */ | |
6518 | if (size && integer_zerop (size)) | |
6519 | { | |
8d9f82d5 | 6520 | gcc_assert (itype); |
8c4353b7 | 6521 | type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); |
9df594d7 RG |
6522 | TYPE_SIZE (type) = bitsize_zero_node; |
6523 | TYPE_SIZE_UNIT (type) = size_zero_node; | |
e4a95933 | 6524 | SET_TYPE_STRUCTURAL_EQUALITY (type); |
9df594d7 | 6525 | } |
52ffd86e MS |
6526 | if (array_parm_vla_unspec_p) |
6527 | { | |
8d9f82d5 | 6528 | gcc_assert (itype); |
52ffd86e | 6529 | /* The type is complete. C99 6.7.5.2p4 */ |
8c4353b7 | 6530 | type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); |
52ffd86e MS |
6531 | TYPE_SIZE (type) = bitsize_zero_node; |
6532 | TYPE_SIZE_UNIT (type) = size_zero_node; | |
e4a95933 | 6533 | SET_TYPE_STRUCTURAL_EQUALITY (type); |
52ffd86e | 6534 | } |
e78bede6 MP |
6535 | |
6536 | if (!valid_array_size_p (loc, type, name)) | |
6537 | type = error_mark_node; | |
366de0ce | 6538 | } |
51e29401 | 6539 | |
366de0ce | 6540 | if (decl_context != PARM |
3b53cddc JM |
6541 | && (array_ptr_quals != TYPE_UNQUALIFIED |
6542 | || array_ptr_attrs != NULL_TREE | |
6543 | || array_parm_static)) | |
366de0ce | 6544 | { |
e78bede6 MP |
6545 | error_at (loc, "static or type qualifiers in non-parameter " |
6546 | "array declarator"); | |
3b53cddc JM |
6547 | array_ptr_quals = TYPE_UNQUALIFIED; |
6548 | array_ptr_attrs = NULL_TREE; | |
e3455240 | 6549 | array_parm_static = false; |
366de0ce | 6550 | } |
e9e32ee6 | 6551 | orig_qual_indirect++; |
366de0ce NS |
6552 | break; |
6553 | } | |
f8893e47 | 6554 | case cdk_function: |
366de0ce NS |
6555 | { |
6556 | /* Say it's a definition only for the declarator closest | |
6557 | to the identifier, apart possibly from some | |
6558 | attributes. */ | |
6559 | bool really_funcdef = false; | |
6560 | tree arg_types; | |
e9e32ee6 | 6561 | orig_qual_type = NULL_TREE; |
366de0ce NS |
6562 | if (funcdef_flag) |
6563 | { | |
f8893e47 JM |
6564 | const struct c_declarator *t = declarator->declarator; |
6565 | while (t->kind == cdk_attrs) | |
6566 | t = t->declarator; | |
6567 | really_funcdef = (t->kind == cdk_id); | |
366de0ce | 6568 | } |
51e29401 | 6569 | |
366de0ce NS |
6570 | /* Declaring a function type. Make sure we have a valid |
6571 | type for the function to return. */ | |
6572 | if (type == error_mark_node) | |
6573 | continue; | |
c22cacf3 | 6574 | |
f9551830 | 6575 | size_varies = false; |
51e29401 | 6576 | |
366de0ce NS |
6577 | /* Warn about some types functions can't return. */ |
6578 | if (TREE_CODE (type) == FUNCTION_TYPE) | |
6579 | { | |
88388a52 | 6580 | if (name) |
c2255bc4 AH |
6581 | error_at (loc, "%qE declared as function returning a " |
6582 | "function", name); | |
88388a52 | 6583 | else |
c2255bc4 AH |
6584 | error_at (loc, "type name declared as function " |
6585 | "returning a function"); | |
366de0ce NS |
6586 | type = integer_type_node; |
6587 | } | |
6588 | if (TREE_CODE (type) == ARRAY_TYPE) | |
6589 | { | |
88388a52 | 6590 | if (name) |
c2255bc4 AH |
6591 | error_at (loc, "%qE declared as function returning an array", |
6592 | name); | |
88388a52 | 6593 | else |
c2255bc4 AH |
6594 | error_at (loc, "type name declared as function returning " |
6595 | "an array"); | |
366de0ce NS |
6596 | type = integer_type_node; |
6597 | } | |
51e29401 | 6598 | |
366de0ce NS |
6599 | /* Construct the function type and go to the next |
6600 | inner layer of declarator. */ | |
f8893e47 | 6601 | arg_info = declarator->u.arg_info; |
366de0ce | 6602 | arg_types = grokparms (arg_info, really_funcdef); |
51e29401 | 6603 | |
366de0ce NS |
6604 | /* Type qualifiers before the return type of the function |
6605 | qualify the return type, not the function type. */ | |
6606 | if (type_quals) | |
6607 | { | |
8a14afd0 BS |
6608 | const enum c_declspec_word ignored_quals_list[] = |
6609 | { | |
6610 | cdw_const, cdw_volatile, cdw_restrict, cdw_address_space, | |
6611 | cdw_atomic, cdw_number_of_elements | |
6612 | }; | |
6613 | location_t specs_loc | |
6614 | = smallest_type_quals_location (declspecs->locations, | |
6615 | ignored_quals_list); | |
6616 | if (specs_loc == UNKNOWN_LOCATION) | |
6617 | specs_loc = declspecs->locations[cdw_typedef]; | |
6618 | if (specs_loc == UNKNOWN_LOCATION) | |
6619 | specs_loc = loc; | |
6620 | ||
c22cacf3 | 6621 | /* Type qualifiers on a function return type are |
366de0ce NS |
6622 | normally permitted by the standard but have no |
6623 | effect, so give a warning at -Wreturn-type. | |
6624 | Qualifiers on a void return type are banned on | |
6625 | function definitions in ISO C; GCC used to used | |
aa4b467b JM |
6626 | them for noreturn functions. The resolution of C11 |
6627 | DR#423 means qualifiers (other than _Atomic) are | |
6628 | actually removed from the return type when | |
6629 | determining the function type. */ | |
8a14afd0 | 6630 | int quals_used = type_quals; |
aa4b467b JM |
6631 | if (flag_isoc11) |
6632 | quals_used &= TYPE_QUAL_ATOMIC; | |
6633 | if (quals_used && VOID_TYPE_P (type) && really_funcdef) | |
8a14afd0 | 6634 | pedwarn (specs_loc, 0, |
855cd9b1 JJ |
6635 | "function definition has qualified void " |
6636 | "return type"); | |
44c21c7f | 6637 | else |
8a14afd0 | 6638 | warning_at (specs_loc, OPT_Wignored_qualifiers, |
855cd9b1 JJ |
6639 | "type qualifiers ignored on function " |
6640 | "return type"); | |
c22cacf3 | 6641 | |
aa4b467b JM |
6642 | /* Ensure an error for restrict on invalid types; the |
6643 | DR#423 resolution is not entirely clear about | |
6644 | this. */ | |
6645 | if (flag_isoc11 | |
6646 | && (type_quals & TYPE_QUAL_RESTRICT) | |
6647 | && (!POINTER_TYPE_P (type) | |
6648 | || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type)))) | |
6649 | error_at (loc, "invalid use of %<restrict%>"); | |
855cd9b1 | 6650 | type = c_build_qualified_type (type, quals_used); |
366de0ce NS |
6651 | } |
6652 | type_quals = TYPE_UNQUALIFIED; | |
c22cacf3 | 6653 | |
366de0ce | 6654 | type = build_function_type (type, arg_types); |
f8893e47 | 6655 | declarator = declarator->declarator; |
c22cacf3 | 6656 | |
366de0ce NS |
6657 | /* Set the TYPE_CONTEXTs for each tagged type which is local to |
6658 | the formal parameter list of this FUNCTION_TYPE to point to | |
6659 | the FUNCTION_TYPE node itself. */ | |
e0c9fbb7 | 6660 | { |
e60bf9d4 NF |
6661 | c_arg_tag *tag; |
6662 | unsigned ix; | |
c22cacf3 | 6663 | |
9771b263 | 6664 | FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag) |
e60bf9d4 | 6665 | TYPE_CONTEXT (tag->type) = type; |
e0c9fbb7 | 6666 | } |
366de0ce NS |
6667 | break; |
6668 | } | |
f8893e47 | 6669 | case cdk_pointer: |
51e29401 | 6670 | { |
366de0ce NS |
6671 | /* Merge any constancy or volatility into the target type |
6672 | for the pointer. */ | |
267bac10 JM |
6673 | if ((type_quals & TYPE_QUAL_ATOMIC) |
6674 | && TREE_CODE (type) == FUNCTION_TYPE) | |
6675 | { | |
6676 | error_at (loc, | |
6677 | "%<_Atomic%>-qualified function type"); | |
6678 | type_quals &= ~TYPE_QUAL_ATOMIC; | |
6679 | } | |
6680 | else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE | |
6681 | && type_quals) | |
c1771a20 | 6682 | pedwarn (loc, OPT_Wpedantic, |
509c9d60 | 6683 | "ISO C forbids qualified function types"); |
366de0ce | 6684 | if (type_quals) |
e9e32ee6 JM |
6685 | type = c_build_qualified_type (type, type_quals, orig_qual_type, |
6686 | orig_qual_indirect); | |
6687 | orig_qual_type = NULL_TREE; | |
f9551830 | 6688 | size_varies = false; |
3b53cddc | 6689 | |
706c4bb7 OH |
6690 | /* When the pointed-to type involves components of variable size, |
6691 | care must be taken to ensure that the size evaluation code is | |
6692 | emitted early enough to dominate all the possible later uses | |
6693 | and late enough for the variables on which it depends to have | |
6694 | been assigned. | |
6695 | ||
6696 | This is expected to happen automatically when the pointed-to | |
6697 | type has a name/declaration of it's own, but special attention | |
6698 | is required if the type is anonymous. | |
6699 | ||
d74641bd RS |
6700 | We attach an artificial TYPE_DECL to such pointed-to type |
6701 | and arrange for it to be included in a DECL_EXPR. This | |
6702 | forces the sizes evaluation at a safe point and ensures it | |
6703 | is not deferred until e.g. within a deeper conditional context. | |
6704 | ||
6705 | PARM contexts have no enclosing statement list that | |
6706 | can hold the DECL_EXPR, so we need to use a BIND_EXPR | |
6707 | instead, and add it to the list of expressions that | |
6708 | need to be evaluated. | |
6709 | ||
6710 | TYPENAME contexts do have an enclosing statement list, | |
6711 | but it would be incorrect to use it, as the size should | |
6712 | only be evaluated if the containing expression is | |
6713 | evaluated. We might also be in the middle of an | |
6714 | expression with side effects on the pointed-to type size | |
6715 | "arguments" prior to the pointer declaration point and | |
6716 | the fake TYPE_DECL in the enclosing context would force | |
6717 | the size evaluation prior to the side effects. We therefore | |
6718 | use BIND_EXPRs in TYPENAME contexts too. */ | |
706c4bb7 | 6719 | if (!TYPE_NAME (type) |
706c4bb7 OH |
6720 | && variably_modified_type_p (type, NULL_TREE)) |
6721 | { | |
d74641bd RS |
6722 | tree bind = NULL_TREE; |
6723 | if (decl_context == TYPENAME || decl_context == PARM) | |
6724 | { | |
6725 | bind = build3 (BIND_EXPR, void_type_node, NULL_TREE, | |
6726 | NULL_TREE, NULL_TREE); | |
6727 | TREE_SIDE_EFFECTS (bind) = 1; | |
6728 | BIND_EXPR_BODY (bind) = push_stmt_list (); | |
6729 | push_scope (); | |
6730 | } | |
c2255bc4 | 6731 | tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type); |
706c4bb7 OH |
6732 | DECL_ARTIFICIAL (decl) = 1; |
6733 | pushdecl (decl); | |
c2255bc4 | 6734 | finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE); |
706c4bb7 | 6735 | TYPE_NAME (type) = decl; |
d74641bd RS |
6736 | if (bind) |
6737 | { | |
6738 | pop_scope (); | |
6739 | BIND_EXPR_BODY (bind) | |
6740 | = pop_stmt_list (BIND_EXPR_BODY (bind)); | |
6741 | if (*expr) | |
6742 | *expr = build2 (COMPOUND_EXPR, void_type_node, *expr, | |
6743 | bind); | |
6744 | else | |
6745 | *expr = bind; | |
6746 | } | |
706c4bb7 OH |
6747 | } |
6748 | ||
412cd719 | 6749 | type = c_build_pointer_type (type); |
c22cacf3 | 6750 | |
deb176fa JM |
6751 | /* Process type qualifiers (such as const or volatile) |
6752 | that were given inside the `*'. */ | |
3b53cddc | 6753 | type_quals = declarator->u.pointer_quals; |
deb176fa | 6754 | |
f8893e47 | 6755 | declarator = declarator->declarator; |
366de0ce | 6756 | break; |
51e29401 | 6757 | } |
366de0ce NS |
6758 | default: |
6759 | gcc_unreachable (); | |
51e29401 | 6760 | } |
51e29401 | 6761 | } |
b9baeecd | 6762 | *decl_attrs = chainon (returned_attrs, *decl_attrs); |
51e29401 | 6763 | |
46df2823 JM |
6764 | /* Now TYPE has the actual type, apart from any qualifiers in |
6765 | TYPE_QUALS. */ | |
51e29401 | 6766 | |
36c5e70a BE |
6767 | /* Warn about address space used for things other than static memory or |
6768 | pointers. */ | |
6769 | address_space = DECODE_QUAL_ADDR_SPACE (type_quals); | |
6770 | if (!ADDR_SPACE_GENERIC_P (address_space)) | |
6771 | { | |
6772 | if (decl_context == NORMAL) | |
6773 | { | |
6774 | switch (storage_class) | |
6775 | { | |
6776 | case csc_auto: | |
6777 | error ("%qs combined with %<auto%> qualifier for %qE", | |
6778 | c_addr_space_name (address_space), name); | |
6779 | break; | |
6780 | case csc_register: | |
6781 | error ("%qs combined with %<register%> qualifier for %qE", | |
6782 | c_addr_space_name (address_space), name); | |
6783 | break; | |
6784 | case csc_none: | |
6785 | if (current_function_scope) | |
6786 | { | |
6787 | error ("%qs specified for auto variable %qE", | |
6788 | c_addr_space_name (address_space), name); | |
6789 | break; | |
6790 | } | |
6791 | break; | |
6792 | case csc_static: | |
6793 | case csc_extern: | |
6794 | case csc_typedef: | |
6795 | break; | |
6796 | default: | |
6797 | gcc_unreachable (); | |
6798 | } | |
6799 | } | |
6800 | else if (decl_context == PARM && TREE_CODE (type) != ARRAY_TYPE) | |
6801 | { | |
6802 | if (name) | |
6803 | error ("%qs specified for parameter %qE", | |
6804 | c_addr_space_name (address_space), name); | |
6805 | else | |
6806 | error ("%qs specified for unnamed parameter", | |
6807 | c_addr_space_name (address_space)); | |
6808 | } | |
6809 | else if (decl_context == FIELD) | |
6810 | { | |
6811 | if (name) | |
6812 | error ("%qs specified for structure field %qE", | |
6813 | c_addr_space_name (address_space), name); | |
6814 | else | |
6815 | error ("%qs specified for structure field", | |
6816 | c_addr_space_name (address_space)); | |
6817 | } | |
6818 | } | |
6819 | ||
d134f39e JM |
6820 | /* Check the type and width of a bit-field. */ |
6821 | if (bitfield) | |
267bac10 | 6822 | { |
420a9d9b | 6823 | check_bitfield_type_and_width (loc, &type, width, name); |
267bac10 JM |
6824 | /* C11 makes it implementation-defined (6.7.2.1#5) whether |
6825 | atomic types are permitted for bit-fields; we have no code to | |
6826 | make bit-field accesses atomic, so disallow them. */ | |
6827 | if (type_quals & TYPE_QUAL_ATOMIC) | |
6828 | { | |
6829 | if (name) | |
191a6b94 | 6830 | error_at (loc, "bit-field %qE has atomic type", name); |
267bac10 | 6831 | else |
191a6b94 | 6832 | error_at (loc, "bit-field has atomic type"); |
267bac10 JM |
6833 | type_quals &= ~TYPE_QUAL_ATOMIC; |
6834 | } | |
6835 | } | |
d134f39e | 6836 | |
d19fa6b5 JM |
6837 | /* Reject invalid uses of _Alignas. */ |
6838 | if (declspecs->alignas_p) | |
6839 | { | |
6840 | if (storage_class == csc_typedef) | |
6841 | error_at (loc, "alignment specified for typedef %qE", name); | |
6842 | else if (storage_class == csc_register) | |
6843 | error_at (loc, "alignment specified for %<register%> object %qE", | |
6844 | name); | |
6845 | else if (decl_context == PARM) | |
6846 | { | |
6847 | if (name) | |
6848 | error_at (loc, "alignment specified for parameter %qE", name); | |
6849 | else | |
6850 | error_at (loc, "alignment specified for unnamed parameter"); | |
6851 | } | |
6852 | else if (bitfield) | |
6853 | { | |
6854 | if (name) | |
6855 | error_at (loc, "alignment specified for bit-field %qE", name); | |
6856 | else | |
6857 | error_at (loc, "alignment specified for unnamed bit-field"); | |
6858 | } | |
6859 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
6860 | error_at (loc, "alignment specified for function %qE", name); | |
92a5f2ba | 6861 | else if (declspecs->align_log != -1 && TYPE_P (type)) |
d19fa6b5 JM |
6862 | { |
6863 | alignas_align = 1U << declspecs->align_log; | |
2793eeab | 6864 | if (alignas_align < min_align_of_type (type)) |
d19fa6b5 JM |
6865 | { |
6866 | if (name) | |
6867 | error_at (loc, "%<_Alignas%> specifiers cannot reduce " | |
6868 | "alignment of %qE", name); | |
6869 | else | |
6870 | error_at (loc, "%<_Alignas%> specifiers cannot reduce " | |
6871 | "alignment of unnamed field"); | |
6872 | alignas_align = 0; | |
6873 | } | |
6874 | } | |
6875 | } | |
6876 | ||
51e29401 RS |
6877 | /* If this is declaring a typedef name, return a TYPE_DECL. */ |
6878 | ||
9a26d6ee | 6879 | if (storage_class == csc_typedef) |
51e29401 RS |
6880 | { |
6881 | tree decl; | |
267bac10 JM |
6882 | if ((type_quals & TYPE_QUAL_ATOMIC) |
6883 | && TREE_CODE (type) == FUNCTION_TYPE) | |
6884 | { | |
6885 | error_at (loc, | |
6886 | "%<_Atomic%>-qualified function type"); | |
6887 | type_quals &= ~TYPE_QUAL_ATOMIC; | |
6888 | } | |
6889 | else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE | |
6890 | && type_quals) | |
c1771a20 | 6891 | pedwarn (loc, OPT_Wpedantic, |
509c9d60 | 6892 | "ISO C forbids qualified function types"); |
3932261a | 6893 | if (type_quals) |
e9e32ee6 JM |
6894 | type = c_build_qualified_type (type, type_quals, orig_qual_type, |
6895 | orig_qual_indirect); | |
c2255bc4 AH |
6896 | decl = build_decl (declarator->id_loc, |
6897 | TYPE_DECL, declarator->u.id, type); | |
98c3a782 | 6898 | if (declspecs->explicit_signed_p) |
51e29401 | 6899 | C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1; |
61f4f1cc | 6900 | if (declspecs->inline_p) |
c2255bc4 | 6901 | pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl); |
bbceee64 JM |
6902 | if (declspecs->noreturn_p) |
6903 | pedwarn (loc, 0,"typedef %q+D declared %<_Noreturn%>", decl); | |
7e5487a2 ILT |
6904 | |
6905 | if (warn_cxx_compat && declarator->u.id != NULL_TREE) | |
6906 | { | |
6907 | struct c_binding *b = I_TAG_BINDING (declarator->u.id); | |
6908 | ||
6909 | if (b != NULL | |
6910 | && b->decl != NULL_TREE | |
6911 | && (B_IN_CURRENT_SCOPE (b) | |
6912 | || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b))) | |
6913 | && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type)) | |
6914 | { | |
097f82ec | 6915 | auto_diagnostic_group d; |
bb85aa74 MP |
6916 | if (warning_at (declarator->id_loc, OPT_Wc___compat, |
6917 | ("using %qD as both a typedef and a tag is " | |
6918 | "invalid in C++"), decl) | |
6919 | && b->locus != UNKNOWN_LOCATION) | |
7e5487a2 ILT |
6920 | inform (b->locus, "originally defined here"); |
6921 | } | |
6922 | } | |
6923 | ||
51e29401 RS |
6924 | return decl; |
6925 | } | |
6926 | ||
51e29401 RS |
6927 | /* If this is a type name (such as, in a cast or sizeof), |
6928 | compute the type and return it now. */ | |
6929 | ||
6930 | if (decl_context == TYPENAME) | |
6931 | { | |
61f4f1cc JM |
6932 | /* Note that the grammar rejects storage classes in typenames |
6933 | and fields. */ | |
6934 | gcc_assert (storage_class == csc_none && !threadp | |
bbceee64 | 6935 | && !declspecs->inline_p && !declspecs->noreturn_p); |
267bac10 JM |
6936 | if ((type_quals & TYPE_QUAL_ATOMIC) |
6937 | && TREE_CODE (type) == FUNCTION_TYPE) | |
6938 | { | |
6939 | error_at (loc, | |
6940 | "%<_Atomic%>-qualified function type"); | |
6941 | type_quals &= ~TYPE_QUAL_ATOMIC; | |
6942 | } | |
6943 | else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE | |
6944 | && type_quals) | |
c1771a20 | 6945 | pedwarn (loc, OPT_Wpedantic, |
509c9d60 | 6946 | "ISO C forbids const or volatile function types"); |
3932261a | 6947 | if (type_quals) |
e9e32ee6 JM |
6948 | type = c_build_qualified_type (type, type_quals, orig_qual_type, |
6949 | orig_qual_indirect); | |
51e29401 RS |
6950 | return type; |
6951 | } | |
6952 | ||
52ffd86e MS |
6953 | if (pedantic && decl_context == FIELD |
6954 | && variably_modified_type_p (type, NULL_TREE)) | |
6955 | { | |
6956 | /* C99 6.7.2.1p8 */ | |
c1771a20 | 6957 | pedwarn (loc, OPT_Wpedantic, "a member of a structure or union cannot " |
c2255bc4 | 6958 | "have a variably modified type"); |
52ffd86e MS |
6959 | } |
6960 | ||
61df2ee2 RS |
6961 | /* Aside from typedefs and type names (handle above), |
6962 | `void' at top level (not within pointer) | |
6963 | is allowed only in public variables. | |
51e29401 RS |
6964 | We don't complain about parms either, but that is because |
6965 | a better error message can be made later. */ | |
6966 | ||
71653180 | 6967 | if (VOID_TYPE_P (type) && decl_context != PARM |
3f75a254 | 6968 | && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE) |
9a26d6ee | 6969 | && (storage_class == csc_extern |
f75fbaf7 | 6970 | || (current_scope == file_scope |
9a26d6ee JM |
6971 | && !(storage_class == csc_static |
6972 | || storage_class == csc_register))))) | |
51e29401 | 6973 | { |
c2255bc4 | 6974 | error_at (loc, "variable or field %qE declared void", name); |
51e29401 RS |
6975 | type = integer_type_node; |
6976 | } | |
6977 | ||
6978 | /* Now create the decl, which may be a VAR_DECL, a PARM_DECL | |
6979 | or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */ | |
6980 | ||
6981 | { | |
91d231cb | 6982 | tree decl; |
51e29401 RS |
6983 | |
6984 | if (decl_context == PARM) | |
6985 | { | |
c530479e | 6986 | tree promoted_type; |
773ec47f | 6987 | bool array_parameter_p = false; |
51e29401 RS |
6988 | |
6989 | /* A parameter declared as an array of T is really a pointer to T. | |
6990 | One declared as a function is really a pointer to a function. */ | |
6991 | ||
6992 | if (TREE_CODE (type) == ARRAY_TYPE) | |
6993 | { | |
6994 | /* Transfer const-ness of array into that of type pointed to. */ | |
eaf2e788 | 6995 | type = TREE_TYPE (type); |
66189108 MP |
6996 | if (orig_qual_type != NULL_TREE) |
6997 | { | |
6998 | if (orig_qual_indirect == 0) | |
6999 | orig_qual_type = TREE_TYPE (orig_qual_type); | |
7000 | else | |
7001 | orig_qual_indirect--; | |
7002 | } | |
3932261a | 7003 | if (type_quals) |
e9e32ee6 JM |
7004 | type = c_build_qualified_type (type, type_quals, orig_qual_type, |
7005 | orig_qual_indirect); | |
412cd719 | 7006 | type = c_build_pointer_type (type); |
3b53cddc | 7007 | type_quals = array_ptr_quals; |
b09869ff JM |
7008 | if (type_quals) |
7009 | type = c_build_qualified_type (type, type_quals); | |
0e03329a | 7010 | |
3b53cddc JM |
7011 | /* We don't yet implement attributes in this context. */ |
7012 | if (array_ptr_attrs != NULL_TREE) | |
c2255bc4 AH |
7013 | warning_at (loc, OPT_Wattributes, |
7014 | "attributes in parameter array declarator ignored"); | |
0e03329a | 7015 | |
f9551830 | 7016 | size_varies = false; |
773ec47f | 7017 | array_parameter_p = true; |
51e29401 RS |
7018 | } |
7019 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
7020 | { | |
267bac10 JM |
7021 | if (type_quals & TYPE_QUAL_ATOMIC) |
7022 | { | |
7023 | error_at (loc, | |
7024 | "%<_Atomic%>-qualified function type"); | |
7025 | type_quals &= ~TYPE_QUAL_ATOMIC; | |
7026 | } | |
7027 | else if (type_quals) | |
c1771a20 | 7028 | pedwarn (loc, OPT_Wpedantic, |
509c9d60 | 7029 | "ISO C forbids qualified function types"); |
3932261a MM |
7030 | if (type_quals) |
7031 | type = c_build_qualified_type (type, type_quals); | |
412cd719 | 7032 | type = c_build_pointer_type (type); |
3932261a | 7033 | type_quals = TYPE_UNQUALIFIED; |
51e29401 | 7034 | } |
0f38b811 MM |
7035 | else if (type_quals) |
7036 | type = c_build_qualified_type (type, type_quals); | |
35b1a6fa | 7037 | |
c2255bc4 AH |
7038 | decl = build_decl (declarator->id_loc, |
7039 | PARM_DECL, declarator->u.id, type); | |
929f3671 | 7040 | if (size_varies) |
51e29401 | 7041 | C_DECL_VARIABLE_SIZE (decl) = 1; |
773ec47f | 7042 | C_ARRAY_PARAMETER (decl) = array_parameter_p; |
51e29401 RS |
7043 | |
7044 | /* Compute the type actually passed in the parmlist, | |
7045 | for the case where there is no prototype. | |
7046 | (For example, shorts and chars are passed as ints.) | |
7047 | When there is a prototype, this is overridden later. */ | |
7048 | ||
c530479e RH |
7049 | if (type == error_mark_node) |
7050 | promoted_type = type; | |
7051 | else | |
ab393bf1 | 7052 | promoted_type = c_type_promotes_to (type); |
51e29401 | 7053 | |
c530479e | 7054 | DECL_ARG_TYPE (decl) = promoted_type; |
61f4f1cc | 7055 | if (declspecs->inline_p) |
c2255bc4 | 7056 | pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl); |
bbceee64 JM |
7057 | if (declspecs->noreturn_p) |
7058 | pedwarn (loc, 0, "parameter %q+D declared %<_Noreturn%>", decl); | |
51e29401 RS |
7059 | } |
7060 | else if (decl_context == FIELD) | |
7061 | { | |
61f4f1cc JM |
7062 | /* Note that the grammar rejects storage classes in typenames |
7063 | and fields. */ | |
7064 | gcc_assert (storage_class == csc_none && !threadp | |
bbceee64 | 7065 | && !declspecs->inline_p && !declspecs->noreturn_p); |
61f4f1cc | 7066 | |
51e29401 | 7067 | /* Structure field. It may not be a function. */ |
dfd48d76 | 7068 | |
51e29401 RS |
7069 | if (TREE_CODE (type) == FUNCTION_TYPE) |
7070 | { | |
c2255bc4 | 7071 | error_at (loc, "field %qE declared as a function", name); |
51e29401 RS |
7072 | type = build_pointer_type (type); |
7073 | } | |
d0f062fb | 7074 | else if (TREE_CODE (type) != ERROR_MARK |
c22cacf3 | 7075 | && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type)) |
51e29401 | 7076 | { |
1202aec1 | 7077 | if (name) |
c2255bc4 | 7078 | error_at (loc, "field %qE has incomplete type", name); |
1202aec1 | 7079 | else |
c2255bc4 | 7080 | error_at (loc, "unnamed field has incomplete type"); |
51e29401 RS |
7081 | type = error_mark_node; |
7082 | } | |
065d214c MP |
7083 | else if (TREE_CODE (type) == ARRAY_TYPE |
7084 | && TYPE_DOMAIN (type) == NULL_TREE) | |
7085 | { | |
7086 | /* We have a flexible array member through a typedef. | |
7087 | Set suitable range. Whether this is a correct position | |
7088 | for a flexible array member will be determined elsewhere. */ | |
7089 | if (!in_system_header_at (input_location)) | |
7090 | pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not " | |
7091 | "support flexible array members"); | |
7092 | type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); | |
7093 | TYPE_DOMAIN (type) = build_range_type (sizetype, size_zero_node, | |
7094 | NULL_TREE); | |
b95a64bb JJ |
7095 | if (orig_qual_indirect == 0) |
7096 | orig_qual_type = NULL_TREE; | |
065d214c | 7097 | } |
e9e32ee6 JM |
7098 | type = c_build_qualified_type (type, type_quals, orig_qual_type, |
7099 | orig_qual_indirect); | |
c2255bc4 AH |
7100 | decl = build_decl (declarator->id_loc, |
7101 | FIELD_DECL, declarator->u.id, type); | |
2bf105ab | 7102 | DECL_NONADDRESSABLE_P (decl) = bitfield; |
ab53bae2 | 7103 | if (bitfield && !declarator->u.id) |
974aedcc MP |
7104 | { |
7105 | TREE_NO_WARNING (decl) = 1; | |
7106 | DECL_PADDING_P (decl) = 1; | |
7107 | } | |
2bf105ab | 7108 | |
929f3671 | 7109 | if (size_varies) |
51e29401 RS |
7110 | C_DECL_VARIABLE_SIZE (decl) = 1; |
7111 | } | |
7112 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
7113 | { | |
9a26d6ee | 7114 | if (storage_class == csc_register || threadp) |
1ac0ac8b | 7115 | { |
c2255bc4 | 7116 | error_at (loc, "invalid storage class for function %qE", name); |
636b4106 | 7117 | } |
ff164b22 GK |
7118 | else if (current_scope != file_scope) |
7119 | { | |
7120 | /* Function declaration not at file scope. Storage | |
7121 | classes other than `extern' are not allowed, C99 | |
7122 | 6.7.1p5, and `extern' makes no difference. However, | |
7123 | GCC allows 'auto', perhaps with 'inline', to support | |
7124 | nested functions. */ | |
9a26d6ee | 7125 | if (storage_class == csc_auto) |
c1771a20 | 7126 | pedwarn (loc, OPT_Wpedantic, |
88388a52 | 7127 | "invalid storage class for function %qE", name); |
6f17bbcf | 7128 | else if (storage_class == csc_static) |
1ac0ac8b | 7129 | { |
c2255bc4 | 7130 | error_at (loc, "invalid storage class for function %qE", name); |
c22cacf3 | 7131 | if (funcdef_flag) |
6f17bbcf JM |
7132 | storage_class = declspecs->storage_class = csc_none; |
7133 | else | |
6574d78e | 7134 | return NULL_TREE; |
1ac0ac8b | 7135 | } |
ff164b22 | 7136 | } |
fd0b8fce | 7137 | |
c2255bc4 AH |
7138 | decl = build_decl (declarator->id_loc, |
7139 | FUNCTION_DECL, declarator->u.id, type); | |
6f17bbcf JM |
7140 | decl = build_decl_attribute_variant (decl, decl_attr); |
7141 | ||
267bac10 JM |
7142 | if (type_quals & TYPE_QUAL_ATOMIC) |
7143 | { | |
7144 | error_at (loc, | |
7145 | "%<_Atomic%>-qualified function type"); | |
7146 | type_quals &= ~TYPE_QUAL_ATOMIC; | |
7147 | } | |
7148 | else if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl)) | |
c1771a20 | 7149 | pedwarn (loc, OPT_Wpedantic, |
fcf73884 | 7150 | "ISO C forbids qualified function types"); |
51e29401 | 7151 | |
9affb2c7 ZW |
7152 | /* Every function declaration is an external reference |
7153 | (DECL_EXTERNAL) except for those which are not at file | |
7154 | scope and are explicitly declared "auto". This is | |
7155 | forbidden by standard C (C99 6.7.1p5) and is interpreted by | |
7156 | GCC to signify a forward declaration of a nested function. */ | |
9a26d6ee | 7157 | if (storage_class == csc_auto && current_scope != file_scope) |
9affb2c7 | 7158 | DECL_EXTERNAL (decl) = 0; |
71113fcd GK |
7159 | /* In C99, a function which is declared 'inline' with 'extern' |
7160 | is not an external reference (which is confusing). It | |
7161 | means that the later definition of the function must be output | |
7162 | in this file, C99 6.7.4p6. In GNU C89, a function declared | |
7163 | 'extern inline' is an external reference. */ | |
7164 | else if (declspecs->inline_p && storage_class != csc_static) | |
da1c7394 ILT |
7165 | DECL_EXTERNAL (decl) = ((storage_class == csc_extern) |
7166 | == flag_gnu89_inline); | |
9affb2c7 | 7167 | else |
71113fcd | 7168 | DECL_EXTERNAL (decl) = !initialized; |
caf93cb0 | 7169 | |
51e29401 RS |
7170 | /* Record absence of global scope for `static' or `auto'. */ |
7171 | TREE_PUBLIC (decl) | |
9a26d6ee | 7172 | = !(storage_class == csc_static || storage_class == csc_auto); |
c40f7b33 | 7173 | |
77dbdb57 | 7174 | /* For a function definition, record the argument information |
7b112487 | 7175 | block where store_parm_decls will look for it. */ |
77dbdb57 | 7176 | if (funcdef_flag) |
7b112487 | 7177 | current_function_arg_info = arg_info; |
77dbdb57 | 7178 | |
98c3a782 | 7179 | if (declspecs->default_int_p) |
5ce89b2e JM |
7180 | C_FUNCTION_IMPLICIT_INT (decl) = 1; |
7181 | ||
bbceee64 JM |
7182 | /* Record presence of `inline' and `_Noreturn', if it is |
7183 | reasonable. */ | |
61f4f1cc | 7184 | if (flag_hosted && MAIN_NAME_P (declarator->u.id)) |
51e29401 | 7185 | { |
9a26d6ee | 7186 | if (declspecs->inline_p) |
c2255bc4 | 7187 | pedwarn (loc, 0, "cannot inline function %<main%>"); |
bbceee64 JM |
7188 | if (declspecs->noreturn_p) |
7189 | pedwarn (loc, 0, "%<main%> declared %<_Noreturn%>"); | |
7190 | } | |
7191 | else | |
7192 | { | |
7193 | if (declspecs->inline_p) | |
7194 | /* Record that the function is declared `inline'. */ | |
7195 | DECL_DECLARED_INLINE_P (decl) = 1; | |
7196 | if (declspecs->noreturn_p) | |
c4b3a0a0 | 7197 | { |
35aff4fb MP |
7198 | if (flag_isoc99) |
7199 | pedwarn_c99 (loc, OPT_Wpedantic, | |
c4b3a0a0 | 7200 | "ISO C99 does not support %<_Noreturn%>"); |
35aff4fb MP |
7201 | else |
7202 | pedwarn_c99 (loc, OPT_Wpedantic, | |
c4b3a0a0 | 7203 | "ISO C90 does not support %<_Noreturn%>"); |
c4b3a0a0 JM |
7204 | TREE_THIS_VOLATILE (decl) = 1; |
7205 | } | |
31ed8fea | 7206 | } |
51e29401 RS |
7207 | } |
7208 | else | |
7209 | { | |
7210 | /* It's a variable. */ | |
fd0b8fce | 7211 | /* An uninitialized decl with `extern' is a reference. */ |
9a26d6ee | 7212 | int extern_ref = !initialized && storage_class == csc_extern; |
51e29401 | 7213 | |
e9e32ee6 JM |
7214 | type = c_build_qualified_type (type, type_quals, orig_qual_type, |
7215 | orig_qual_indirect); | |
f4e92987 | 7216 | |
f75fbaf7 ZW |
7217 | /* C99 6.2.2p7: It is invalid (compile-time undefined |
7218 | behavior) to create an 'extern' declaration for a | |
f4e92987 | 7219 | variable if there is a global declaration that is |
f75fbaf7 ZW |
7220 | 'static' and the global declaration is not visible. |
7221 | (If the static declaration _is_ currently visible, | |
7222 | the 'extern' declaration is taken to refer to that decl.) */ | |
7223 | if (extern_ref && current_scope != file_scope) | |
f4e92987 | 7224 | { |
f8893e47 JM |
7225 | tree global_decl = identifier_global_value (declarator->u.id); |
7226 | tree visible_decl = lookup_name (declarator->u.id); | |
f4e92987 | 7227 | |
35b1a6fa | 7228 | if (global_decl |
f75fbaf7 | 7229 | && global_decl != visible_decl |
0ae9bd27 | 7230 | && VAR_P (global_decl) |
f4e92987 | 7231 | && !TREE_PUBLIC (global_decl)) |
c2255bc4 AH |
7232 | error_at (loc, "variable previously declared %<static%> " |
7233 | "redeclared %<extern%>"); | |
f4e92987 MM |
7234 | } |
7235 | ||
c2255bc4 AH |
7236 | decl = build_decl (declarator->id_loc, |
7237 | VAR_DECL, declarator->u.id, type); | |
929f3671 | 7238 | if (size_varies) |
51e29401 RS |
7239 | C_DECL_VARIABLE_SIZE (decl) = 1; |
7240 | ||
9a26d6ee | 7241 | if (declspecs->inline_p) |
c2255bc4 | 7242 | pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl); |
bbceee64 JM |
7243 | if (declspecs->noreturn_p) |
7244 | pedwarn (loc, 0, "variable %q+D declared %<_Noreturn%>", decl); | |
51e29401 | 7245 | |
bbbcb2e1 JM |
7246 | /* At file scope, an initialized extern declaration may follow |
7247 | a static declaration. In that case, DECL_EXTERNAL will be | |
7248 | reset later in start_decl. */ | |
9a26d6ee | 7249 | DECL_EXTERNAL (decl) = (storage_class == csc_extern); |
3d78f2e9 | 7250 | |
f8521984 | 7251 | /* At file scope, the presence of a `static' or `register' storage |
ee534ebf RS |
7252 | class specifier, or the absence of all storage class specifiers |
7253 | makes this declaration a definition (perhaps tentative). Also, | |
fcc207bf | 7254 | the absence of `static' makes it public. */ |
f75fbaf7 | 7255 | if (current_scope == file_scope) |
51e29401 | 7256 | { |
fcc207bf | 7257 | TREE_PUBLIC (decl) = storage_class != csc_static; |
3d78f2e9 | 7258 | TREE_STATIC (decl) = !extern_ref; |
51e29401 | 7259 | } |
f8521984 | 7260 | /* Not at file scope, only `static' makes a static definition. */ |
51e29401 RS |
7261 | else |
7262 | { | |
9a26d6ee | 7263 | TREE_STATIC (decl) = (storage_class == csc_static); |
3d78f2e9 RH |
7264 | TREE_PUBLIC (decl) = extern_ref; |
7265 | } | |
7266 | ||
9a26d6ee | 7267 | if (threadp) |
56363ffd | 7268 | set_decl_tls_model (decl, decl_default_tls_model (decl)); |
51e29401 RS |
7269 | } |
7270 | ||
92f6fd0b JM |
7271 | if ((storage_class == csc_extern |
7272 | || (storage_class == csc_none | |
7273 | && TREE_CODE (type) == FUNCTION_TYPE | |
7274 | && !funcdef_flag)) | |
52ffd86e MS |
7275 | && variably_modified_type_p (type, NULL_TREE)) |
7276 | { | |
7277 | /* C99 6.7.5.2p2 */ | |
92f6fd0b | 7278 | if (TREE_CODE (type) == FUNCTION_TYPE) |
c2255bc4 | 7279 | error_at (loc, "non-nested function with variably modified type"); |
92f6fd0b | 7280 | else |
c2255bc4 AH |
7281 | error_at (loc, "object with variably modified type must have " |
7282 | "no linkage"); | |
52ffd86e MS |
7283 | } |
7284 | ||
51e29401 RS |
7285 | /* Record `register' declaration for warnings on & |
7286 | and in case doing stupid register allocation. */ | |
7287 | ||
9a26d6ee | 7288 | if (storage_class == csc_register) |
5baeaac0 JM |
7289 | { |
7290 | C_DECL_REGISTER (decl) = 1; | |
7291 | DECL_REGISTER (decl) = 1; | |
7292 | } | |
51e29401 RS |
7293 | |
7294 | /* Record constancy and volatility. */ | |
3932261a | 7295 | c_apply_type_quals_to_decl (type_quals, decl); |
51e29401 | 7296 | |
d19fa6b5 JM |
7297 | /* Apply _Alignas specifiers. */ |
7298 | if (alignas_align) | |
7299 | { | |
fe37c7af | 7300 | SET_DECL_ALIGN (decl, alignas_align * BITS_PER_UNIT); |
d19fa6b5 JM |
7301 | DECL_USER_ALIGN (decl) = 1; |
7302 | } | |
7303 | ||
51e29401 RS |
7304 | /* If a type has volatile components, it should be stored in memory. |
7305 | Otherwise, the fact that those components are volatile | |
820cc88f DB |
7306 | will be ignored, and would even crash the compiler. |
7307 | Of course, this only makes sense on VAR,PARM, and RESULT decl's. */ | |
7308 | if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)) | |
0ae9bd27 | 7309 | && (VAR_P (decl) || TREE_CODE (decl) == PARM_DECL |
820cc88f | 7310 | || TREE_CODE (decl) == RESULT_DECL)) |
5baeaac0 JM |
7311 | { |
7312 | /* It is not an error for a structure with volatile fields to | |
7313 | be declared register, but reset DECL_REGISTER since it | |
7314 | cannot actually go in a register. */ | |
7315 | int was_reg = C_DECL_REGISTER (decl); | |
7316 | C_DECL_REGISTER (decl) = 0; | |
7317 | DECL_REGISTER (decl) = 0; | |
7318 | c_mark_addressable (decl); | |
7319 | C_DECL_REGISTER (decl) = was_reg; | |
7320 | } | |
51e29401 | 7321 | |
d05cc98e GK |
7322 | /* This is the earliest point at which we might know the assembler |
7323 | name of a variable. Thus, if it's known before this, die horribly. */ | |
a92f6726 NS |
7324 | gcc_assert (!HAS_DECL_ASSEMBLER_NAME_P (decl) |
7325 | || !DECL_ASSEMBLER_NAME_SET_P (decl)); | |
d05cc98e | 7326 | |
88eeff6f | 7327 | if (warn_cxx_compat |
0ae9bd27 | 7328 | && VAR_P (decl) |
88eeff6f ILT |
7329 | && TREE_PUBLIC (decl) |
7330 | && TREE_STATIC (decl) | |
3e636daf | 7331 | && (RECORD_OR_UNION_TYPE_P (TREE_TYPE (decl)) |
88eeff6f ILT |
7332 | || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE) |
7333 | && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE) | |
7334 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat, | |
7335 | ("non-local variable %qD with anonymous type is " | |
7336 | "questionable in C++"), | |
7337 | decl); | |
7338 | ||
51e29401 RS |
7339 | return decl; |
7340 | } | |
7341 | } | |
7342 | \f | |
51e29401 | 7343 | /* Decode the parameter-list info for a function type or function definition. |
52ffd86e | 7344 | The argument is the value returned by `get_parm_info' (or made in c-parse.c |
51e29401 RS |
7345 | if there is an identifier list instead of a parameter decl list). |
7346 | These two functions are separate because when a function returns | |
7347 | or receives functions then each is called multiple times but the order | |
7348 | of calls is different. The last call to `grokparms' is always the one | |
7349 | that contains the formal parameter names of a function definition. | |
7350 | ||
51e29401 RS |
7351 | Return a list of arg types to use in the FUNCTION_TYPE for this function. |
7352 | ||
60919bce | 7353 | FUNCDEF_FLAG is true for a function definition, false for |
51e29401 | 7354 | a mere declaration. A nonempty identifier-list gets an error message |
60919bce | 7355 | when FUNCDEF_FLAG is false. */ |
51e29401 RS |
7356 | |
7357 | static tree | |
f8893e47 | 7358 | grokparms (struct c_arg_info *arg_info, bool funcdef_flag) |
51e29401 | 7359 | { |
f8893e47 | 7360 | tree arg_types = arg_info->types; |
51e29401 | 7361 | |
52ffd86e MS |
7362 | if (funcdef_flag && arg_info->had_vla_unspec) |
7363 | { | |
7364 | /* A function definition isn't function prototype scope C99 6.2.1p4. */ | |
7365 | /* C99 6.7.5.2p4 */ | |
7366 | error ("%<[*]%> not allowed in other than function prototype scope"); | |
7367 | } | |
7368 | ||
3fa8871b | 7369 | if (arg_types == NULL_TREE && !funcdef_flag |
8400e75e | 7370 | && !in_system_header_at (input_location)) |
3176a0c2 DD |
7371 | warning (OPT_Wstrict_prototypes, |
7372 | "function declaration isn%'t a prototype"); | |
51e29401 | 7373 | |
f75fbaf7 | 7374 | if (arg_types == error_mark_node) |
6574d78e MP |
7375 | /* Don't set TYPE_ARG_TYPES in this case. */ |
7376 | return NULL_TREE; | |
f75fbaf7 ZW |
7377 | |
7378 | else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE) | |
51e29401 | 7379 | { |
3f75a254 | 7380 | if (!funcdef_flag) |
aa3ef09b | 7381 | { |
6574d78e MP |
7382 | pedwarn (input_location, 0, "parameter names (without types) in " |
7383 | "function declaration"); | |
aa3ef09b NF |
7384 | arg_info->parms = NULL_TREE; |
7385 | } | |
7386 | else | |
7387 | arg_info->parms = arg_info->types; | |
51e29401 | 7388 | |
3fa8871b | 7389 | arg_info->types = NULL_TREE; |
6574d78e | 7390 | return NULL_TREE; |
51e29401 RS |
7391 | } |
7392 | else | |
7393 | { | |
77dbdb57 ZW |
7394 | tree parm, type, typelt; |
7395 | unsigned int parmno; | |
7396 | ||
bba5733f JM |
7397 | /* If there is a parameter of incomplete type in a definition, |
7398 | this is an error. In a declaration this is valid, and a | |
7399 | struct or union type may be completed later, before any calls | |
7400 | or definition of the function. In the case where the tag was | |
7401 | first declared within the parameter list, a warning has | |
7402 | already been given. If a parameter has void type, then | |
7403 | however the function cannot be defined or called, so | |
7404 | warn. */ | |
77dbdb57 | 7405 | |
f8893e47 | 7406 | for (parm = arg_info->parms, typelt = arg_types, parmno = 1; |
eb1dfbb2 | 7407 | parm; |
910ad8de | 7408 | parm = DECL_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++) |
77dbdb57 ZW |
7409 | { |
7410 | type = TREE_VALUE (typelt); | |
7411 | if (type == error_mark_node) | |
7412 | continue; | |
7413 | ||
7414 | if (!COMPLETE_TYPE_P (type)) | |
7415 | { | |
7416 | if (funcdef_flag) | |
7417 | { | |
7418 | if (DECL_NAME (parm)) | |
c5d75364 MLI |
7419 | error_at (input_location, |
7420 | "parameter %u (%q+D) has incomplete type", | |
7421 | parmno, parm); | |
77dbdb57 | 7422 | else |
c5d75364 MLI |
7423 | error_at (DECL_SOURCE_LOCATION (parm), |
7424 | "parameter %u has incomplete type", | |
7425 | parmno); | |
51e29401 | 7426 | |
77dbdb57 ZW |
7427 | TREE_VALUE (typelt) = error_mark_node; |
7428 | TREE_TYPE (parm) = error_mark_node; | |
e49a760f | 7429 | arg_types = NULL_TREE; |
77dbdb57 | 7430 | } |
bba5733f | 7431 | else if (VOID_TYPE_P (type)) |
77dbdb57 ZW |
7432 | { |
7433 | if (DECL_NAME (parm)) | |
c5d75364 MLI |
7434 | warning_at (input_location, 0, |
7435 | "parameter %u (%q+D) has void type", | |
7436 | parmno, parm); | |
77dbdb57 | 7437 | else |
c5d75364 MLI |
7438 | warning_at (DECL_SOURCE_LOCATION (parm), 0, |
7439 | "parameter %u has void type", | |
7440 | parmno); | |
77dbdb57 ZW |
7441 | } |
7442 | } | |
7c47d6e9 JM |
7443 | |
7444 | if (DECL_NAME (parm) && TREE_USED (parm)) | |
7445 | warn_if_shadowing (parm); | |
77dbdb57 ZW |
7446 | } |
7447 | return arg_types; | |
51e29401 RS |
7448 | } |
7449 | } | |
7450 | ||
b3399d18 NF |
7451 | /* Allocate and initialize a c_arg_info structure from the parser's |
7452 | obstack. */ | |
7453 | ||
7454 | struct c_arg_info * | |
7455 | build_arg_info (void) | |
7456 | { | |
7457 | struct c_arg_info *ret = XOBNEW (&parser_obstack, struct c_arg_info); | |
7458 | ret->parms = NULL_TREE; | |
7459 | ret->tags = NULL; | |
7460 | ret->types = NULL_TREE; | |
7461 | ret->others = NULL_TREE; | |
7462 | ret->pending_sizes = NULL; | |
7463 | ret->had_vla_unspec = 0; | |
7464 | return ret; | |
7465 | } | |
7466 | ||
f8893e47 JM |
7467 | /* Take apart the current scope and return a c_arg_info structure with |
7468 | info on a parameter list just parsed. | |
77dbdb57 | 7469 | |
f8893e47 | 7470 | This structure is later fed to 'grokparms' and 'store_parm_decls'. |
51e29401 | 7471 | |
f75fbaf7 | 7472 | ELLIPSIS being true means the argument list ended in '...' so don't |
a04a722b JM |
7473 | append a sentinel (void_list_node) to the end of the type-list. |
7474 | ||
7475 | EXPR is NULL or an expression that needs to be evaluated for the | |
7476 | side effects of array size expressions in the parameters. */ | |
51e29401 | 7477 | |
f8893e47 | 7478 | struct c_arg_info * |
a04a722b | 7479 | get_parm_info (bool ellipsis, tree expr) |
51e29401 | 7480 | { |
f75fbaf7 | 7481 | struct c_binding *b = current_scope->bindings; |
b3399d18 NF |
7482 | struct c_arg_info *arg_info = build_arg_info (); |
7483 | ||
3fa8871b | 7484 | tree parms = NULL_TREE; |
9771b263 | 7485 | vec<c_arg_tag, va_gc> *tags = NULL; |
3fa8871b MP |
7486 | tree types = NULL_TREE; |
7487 | tree others = NULL_TREE; | |
f75fbaf7 | 7488 | |
55d54003 ZW |
7489 | bool gave_void_only_once_err = false; |
7490 | ||
52ffd86e | 7491 | arg_info->had_vla_unspec = current_scope->had_vla_unspec; |
f8893e47 | 7492 | |
f75fbaf7 ZW |
7493 | /* The bindings in this scope must not get put into a block. |
7494 | We will take care of deleting the binding nodes. */ | |
7495 | current_scope->bindings = 0; | |
51e29401 | 7496 | |
f75fbaf7 ZW |
7497 | /* This function is only called if there was *something* on the |
7498 | parameter list. */ | |
366de0ce | 7499 | gcc_assert (b); |
55d54003 | 7500 | |
f75fbaf7 ZW |
7501 | /* A parameter list consisting solely of 'void' indicates that the |
7502 | function takes no arguments. But if the 'void' is qualified | |
7503 | (by 'const' or 'volatile'), or has a storage class specifier | |
7504 | ('register'), then the behavior is undefined; issue an error. | |
7505 | Typedefs for 'void' are OK (see DR#157). */ | |
c22cacf3 | 7506 | if (b->prev == 0 /* one binding */ |
f75fbaf7 ZW |
7507 | && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */ |
7508 | && !DECL_NAME (b->decl) /* anonymous */ | |
7509 | && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */ | |
7510 | { | |
267bac10 | 7511 | if (TYPE_QUALS (TREE_TYPE (b->decl)) != TYPE_UNQUALIFIED |
5baeaac0 | 7512 | || C_DECL_REGISTER (b->decl)) |
657e4e47 | 7513 | error_at (b->locus, "%<void%> as only parameter may not be qualified"); |
55d54003 | 7514 | |
f75fbaf7 ZW |
7515 | /* There cannot be an ellipsis. */ |
7516 | if (ellipsis) | |
657e4e47 | 7517 | error_at (b->locus, "%<void%> must be the only parameter"); |
51e29401 | 7518 | |
f8893e47 | 7519 | arg_info->types = void_list_node; |
f75fbaf7 | 7520 | return arg_info; |
51e29401 RS |
7521 | } |
7522 | ||
f75fbaf7 ZW |
7523 | if (!ellipsis) |
7524 | types = void_list_node; | |
51e29401 | 7525 | |
f75fbaf7 ZW |
7526 | /* Break up the bindings list into parms, tags, types, and others; |
7527 | apply sanity checks; purge the name-to-decl bindings. */ | |
7528 | while (b) | |
51e29401 | 7529 | { |
f75fbaf7 ZW |
7530 | tree decl = b->decl; |
7531 | tree type = TREE_TYPE (decl); | |
f32682ca | 7532 | c_arg_tag tag; |
55d54003 | 7533 | const char *keyword; |
55d54003 | 7534 | |
f75fbaf7 | 7535 | switch (TREE_CODE (decl)) |
6645c3fa | 7536 | { |
f75fbaf7 ZW |
7537 | case PARM_DECL: |
7538 | if (b->id) | |
7539 | { | |
366de0ce | 7540 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); |
f75fbaf7 ZW |
7541 | I_SYMBOL_BINDING (b->id) = b->shadowed; |
7542 | } | |
55d54003 | 7543 | |
f75fbaf7 ZW |
7544 | /* Check for forward decls that never got their actual decl. */ |
7545 | if (TREE_ASM_WRITTEN (decl)) | |
657e4e47 JJ |
7546 | error_at (b->locus, |
7547 | "parameter %q+D has just a forward declaration", decl); | |
f75fbaf7 ZW |
7548 | /* Check for (..., void, ...) and issue an error. */ |
7549 | else if (VOID_TYPE_P (type) && !DECL_NAME (decl)) | |
7550 | { | |
7551 | if (!gave_void_only_once_err) | |
7552 | { | |
657e4e47 | 7553 | error_at (b->locus, "%<void%> must be the only parameter"); |
f75fbaf7 ZW |
7554 | gave_void_only_once_err = true; |
7555 | } | |
7556 | } | |
7557 | else | |
7558 | { | |
7559 | /* Valid parameter, add it to the list. */ | |
910ad8de | 7560 | DECL_CHAIN (decl) = parms; |
f75fbaf7 ZW |
7561 | parms = decl; |
7562 | ||
7563 | /* Since there is a prototype, args are passed in their | |
7564 | declared types. The back end may override this later. */ | |
7565 | DECL_ARG_TYPE (decl) = type; | |
7566 | types = tree_cons (0, type, types); | |
7567 | } | |
7568 | break; | |
55d54003 | 7569 | |
56141a6a | 7570 | case ENUMERAL_TYPE: keyword = "enum"; goto tag; |
f75fbaf7 | 7571 | case UNION_TYPE: keyword = "union"; goto tag; |
56141a6a | 7572 | case RECORD_TYPE: keyword = "struct"; goto tag; |
f75fbaf7 ZW |
7573 | tag: |
7574 | /* Types may not have tag-names, in which case the type | |
7575 | appears in the bindings list with b->id NULL. */ | |
7576 | if (b->id) | |
7577 | { | |
366de0ce | 7578 | gcc_assert (I_TAG_BINDING (b->id) == b); |
f75fbaf7 ZW |
7579 | I_TAG_BINDING (b->id) = b->shadowed; |
7580 | } | |
55d54003 | 7581 | |
f75fbaf7 ZW |
7582 | /* Warn about any struct, union or enum tags defined in a |
7583 | parameter list. The scope of such types is limited to | |
7584 | the parameter list, which is rarely if ever desirable | |
7585 | (it's impossible to call such a function with type- | |
7586 | correct arguments). An anonymous union parm type is | |
7587 | meaningful as a GNU extension, so don't warn for that. */ | |
3fa8871b | 7588 | if (TREE_CODE (decl) != UNION_TYPE || b->id != NULL_TREE) |
f75fbaf7 ZW |
7589 | { |
7590 | if (b->id) | |
7591 | /* The %s will be one of 'struct', 'union', or 'enum'. */ | |
657e4e47 | 7592 | warning_at (b->locus, 0, |
46308474 LFSM |
7593 | "%<%s %E%> declared inside parameter list" |
7594 | " will not be visible outside of this definition or" | |
7595 | " declaration", keyword, b->id); | |
f75fbaf7 ZW |
7596 | else |
7597 | /* The %s will be one of 'struct', 'union', or 'enum'. */ | |
657e4e47 | 7598 | warning_at (b->locus, 0, |
46308474 LFSM |
7599 | "anonymous %s declared inside parameter list" |
7600 | " will not be visible outside of this definition or" | |
7601 | " declaration", keyword); | |
f75fbaf7 | 7602 | } |
55d54003 | 7603 | |
f32682ca DN |
7604 | tag.id = b->id; |
7605 | tag.type = decl; | |
9771b263 | 7606 | vec_safe_push (tags, tag); |
f75fbaf7 ZW |
7607 | break; |
7608 | ||
29b9828f | 7609 | case FUNCTION_DECL: |
08203f73 MP |
7610 | /* FUNCTION_DECLs appear when there is an implicit function |
7611 | declaration in the parameter list. */ | |
7612 | gcc_assert (b->nested || seen_error ()); | |
29b9828f BS |
7613 | goto set_shadowed; |
7614 | ||
f75fbaf7 ZW |
7615 | case CONST_DECL: |
7616 | case TYPE_DECL: | |
7617 | /* CONST_DECLs appear here when we have an embedded enum, | |
7618 | and TYPE_DECLs appear here when we have an embedded struct | |
7619 | or union. No warnings for this - we already warned about the | |
29b9828f | 7620 | type itself. */ |
ee060229 | 7621 | |
10e76c1a JM |
7622 | /* When we reinsert this decl in the function body, we need |
7623 | to reconstruct whether it was marked as nested. */ | |
29b9828f | 7624 | gcc_assert (!b->nested); |
910ad8de | 7625 | DECL_CHAIN (decl) = others; |
18d5f982 ZW |
7626 | others = decl; |
7627 | /* fall through */ | |
7628 | ||
7629 | case ERROR_MARK: | |
29b9828f | 7630 | set_shadowed: |
18d5f982 ZW |
7631 | /* error_mark_node appears here when we have an undeclared |
7632 | variable. Just throw it away. */ | |
f75fbaf7 ZW |
7633 | if (b->id) |
7634 | { | |
366de0ce | 7635 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); |
f75fbaf7 ZW |
7636 | I_SYMBOL_BINDING (b->id) = b->shadowed; |
7637 | } | |
f75fbaf7 ZW |
7638 | break; |
7639 | ||
7640 | /* Other things that might be encountered. */ | |
7641 | case LABEL_DECL: | |
f75fbaf7 | 7642 | case VAR_DECL: |
f75fbaf7 | 7643 | default: |
366de0ce | 7644 | gcc_unreachable (); |
f75fbaf7 ZW |
7645 | } |
7646 | ||
7647 | b = free_binding_and_advance (b); | |
55d54003 ZW |
7648 | } |
7649 | ||
f8893e47 JM |
7650 | arg_info->parms = parms; |
7651 | arg_info->tags = tags; | |
7652 | arg_info->types = types; | |
7653 | arg_info->others = others; | |
a04a722b | 7654 | arg_info->pending_sizes = expr; |
f75fbaf7 | 7655 | return arg_info; |
51e29401 RS |
7656 | } |
7657 | \f | |
7658 | /* Get the struct, enum or union (CODE says which) with tag NAME. | |
c2255bc4 AH |
7659 | Define the tag as a forward-reference with location LOC if it is |
7660 | not defined. Return a c_typespec structure for the type | |
7661 | specifier. */ | |
51e29401 | 7662 | |
81da229b | 7663 | struct c_typespec |
c2255bc4 | 7664 | parser_xref_tag (location_t loc, enum tree_code code, tree name) |
51e29401 | 7665 | { |
81da229b | 7666 | struct c_typespec ret; |
928c19bb | 7667 | tree ref; |
24b97832 | 7668 | location_t refloc; |
928c19bb JM |
7669 | |
7670 | ret.expr = NULL_TREE; | |
7671 | ret.expr_const_operands = true; | |
7672 | ||
51e29401 RS |
7673 | /* If a cross reference is requested, look up the type |
7674 | already defined for this tag and return it. */ | |
7675 | ||
2f3bb934 | 7676 | ref = lookup_tag (code, name, false, &refloc); |
f18b70f5 JM |
7677 | /* If this is the right type of tag, return what we found. |
7678 | (This reference will be shadowed by shadow_tag later if appropriate.) | |
7679 | If this is the wrong type of tag, do not return it. If it was the | |
f8521984 ZW |
7680 | wrong type in the same scope, we will have had an error |
7681 | message already; if in a different scope and declaring | |
f18b70f5 | 7682 | a name, pending_xref_error will give an error message; but if in a |
f8521984 | 7683 | different scope and not declaring a name, this tag should |
f18b70f5 JM |
7684 | shadow the previous declaration of a different type of tag, and |
7685 | this would not work properly if we return the reference found. | |
7686 | (For example, with "struct foo" in an outer scope, "union foo;" | |
7687 | must shadow that tag with a new one of union type.) */ | |
81da229b | 7688 | ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref); |
f18b70f5 | 7689 | if (ref && TREE_CODE (ref) == code) |
81da229b | 7690 | { |
24b97832 ILT |
7691 | if (C_TYPE_DEFINED_IN_STRUCT (ref) |
7692 | && loc != UNKNOWN_LOCATION | |
7693 | && warn_cxx_compat) | |
7694 | { | |
7695 | switch (code) | |
7696 | { | |
7697 | case ENUMERAL_TYPE: | |
7698 | warning_at (loc, OPT_Wc___compat, | |
7699 | ("enum type defined in struct or union " | |
7700 | "is not visible in C++")); | |
7701 | inform (refloc, "enum type defined here"); | |
7702 | break; | |
7703 | case RECORD_TYPE: | |
7704 | warning_at (loc, OPT_Wc___compat, | |
7705 | ("struct defined in struct or union " | |
7706 | "is not visible in C++")); | |
7707 | inform (refloc, "struct defined here"); | |
7708 | break; | |
7709 | case UNION_TYPE: | |
7710 | warning_at (loc, OPT_Wc___compat, | |
7711 | ("union defined in struct or union " | |
7712 | "is not visible in C++")); | |
7713 | inform (refloc, "union defined here"); | |
7714 | break; | |
7715 | default: | |
7716 | gcc_unreachable(); | |
7717 | } | |
7718 | } | |
7719 | ||
81da229b JM |
7720 | ret.spec = ref; |
7721 | return ret; | |
7722 | } | |
51e29401 | 7723 | |
51e29401 RS |
7724 | /* If no such tag is yet defined, create a forward-reference node |
7725 | and record it as the "definition". | |
7726 | When a real declaration of this type is found, | |
7727 | the forward-reference will be altered into a real type. */ | |
7728 | ||
7729 | ref = make_node (code); | |
7730 | if (code == ENUMERAL_TYPE) | |
7731 | { | |
51e29401 RS |
7732 | /* Give the type a default layout like unsigned int |
7733 | to avoid crashing if it does not get defined. */ | |
179d2f74 | 7734 | SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node)); |
fe37c7af | 7735 | SET_TYPE_ALIGN (ref, TYPE_ALIGN (unsigned_type_node)); |
11cf4d18 | 7736 | TYPE_USER_ALIGN (ref) = 0; |
8df83eae | 7737 | TYPE_UNSIGNED (ref) = 1; |
51e29401 RS |
7738 | TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node); |
7739 | TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node); | |
7740 | TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node); | |
7741 | } | |
7742 | ||
c2255bc4 | 7743 | pushtag (loc, name, ref); |
51e29401 | 7744 | |
81da229b JM |
7745 | ret.spec = ref; |
7746 | return ret; | |
7747 | } | |
7748 | ||
7749 | /* Get the struct, enum or union (CODE says which) with tag NAME. | |
7750 | Define the tag as a forward-reference if it is not defined. | |
7751 | Return a tree for the type. */ | |
7752 | ||
7753 | tree | |
7754 | xref_tag (enum tree_code code, tree name) | |
7755 | { | |
c2255bc4 | 7756 | return parser_xref_tag (input_location, code, name).spec; |
51e29401 RS |
7757 | } |
7758 | \f | |
f8521984 | 7759 | /* Make sure that the tag NAME is defined *in the current scope* |
51e29401 | 7760 | at least as a forward reference. |
c2255bc4 | 7761 | LOC is the location of the struct's definition. |
24b97832 ILT |
7762 | CODE says which kind of tag NAME ought to be. |
7763 | ||
dc491a25 ILT |
7764 | This stores the current value of the file static STRUCT_PARSE_INFO |
7765 | in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a | |
7766 | new c_struct_parse_info structure. The old value of | |
7767 | STRUCT_PARSE_INFO is restored in finish_struct. */ | |
51e29401 RS |
7768 | |
7769 | tree | |
c2255bc4 | 7770 | start_struct (location_t loc, enum tree_code code, tree name, |
99b1c316 | 7771 | class c_struct_parse_info **enclosing_struct_parse_info) |
51e29401 | 7772 | { |
f8521984 | 7773 | /* If there is already a tag defined at this scope |
51e29401 RS |
7774 | (as a forward reference), just return it. */ |
7775 | ||
24b97832 ILT |
7776 | tree ref = NULL_TREE; |
7777 | location_t refloc = UNKNOWN_LOCATION; | |
51e29401 | 7778 | |
24b97832 | 7779 | if (name != NULL_TREE) |
2f3bb934 | 7780 | ref = lookup_tag (code, name, true, &refloc); |
51e29401 RS |
7781 | if (ref && TREE_CODE (ref) == code) |
7782 | { | |
dc949728 MP |
7783 | if (TYPE_STUB_DECL (ref)) |
7784 | refloc = DECL_SOURCE_LOCATION (TYPE_STUB_DECL (ref)); | |
7785 | ||
085e33aa | 7786 | if (TYPE_SIZE (ref)) |
c22cacf3 | 7787 | { |
53fcdc76 | 7788 | if (code == UNION_TYPE) |
24b97832 | 7789 | error_at (loc, "redefinition of %<union %E%>", name); |
c22cacf3 | 7790 | else |
24b97832 ILT |
7791 | error_at (loc, "redefinition of %<struct %E%>", name); |
7792 | if (refloc != UNKNOWN_LOCATION) | |
7793 | inform (refloc, "originally defined here"); | |
a03813c8 SE |
7794 | /* Don't create structures using a name already in use. */ |
7795 | ref = NULL_TREE; | |
35b1a6fa | 7796 | } |
085e33aa JM |
7797 | else if (C_TYPE_BEING_DEFINED (ref)) |
7798 | { | |
7799 | if (code == UNION_TYPE) | |
24b97832 | 7800 | error_at (loc, "nested redefinition of %<union %E%>", name); |
c22cacf3 | 7801 | else |
24b97832 ILT |
7802 | error_at (loc, "nested redefinition of %<struct %E%>", name); |
7803 | /* Don't bother to report "originally defined here" for a | |
7804 | nested redefinition; the original definition should be | |
7805 | obvious. */ | |
71113fcd GK |
7806 | /* Don't create structures that contain themselves. */ |
7807 | ref = NULL_TREE; | |
085e33aa | 7808 | } |
51e29401 RS |
7809 | } |
7810 | ||
71113fcd GK |
7811 | /* Otherwise create a forward-reference just so the tag is in scope. */ |
7812 | ||
7813 | if (ref == NULL_TREE || TREE_CODE (ref) != code) | |
7814 | { | |
5326cd3d | 7815 | ref = make_node (code); |
c2255bc4 | 7816 | pushtag (loc, name, ref); |
5326cd3d | 7817 | } |
35b1a6fa | 7818 | |
51e29401 | 7819 | C_TYPE_BEING_DEFINED (ref) = 1; |
a4850ce9 JH |
7820 | for (tree v = TYPE_MAIN_VARIANT (ref); v; v = TYPE_NEXT_VARIANT (v)) |
7821 | TYPE_PACKED (v) = flag_pack_struct; | |
24b97832 | 7822 | |
dc491a25 | 7823 | *enclosing_struct_parse_info = struct_parse_info; |
bf4fa671 | 7824 | struct_parse_info = new c_struct_parse_info (); |
24b97832 ILT |
7825 | |
7826 | /* FIXME: This will issue a warning for a use of a type defined | |
7827 | within a statement expr used within sizeof, et. al. This is not | |
7828 | terribly serious as C++ doesn't permit statement exprs within | |
7829 | sizeof anyhow. */ | |
7830 | if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof)) | |
7831 | warning_at (loc, OPT_Wc___compat, | |
7832 | "defining type in %qs expression is invalid in C++", | |
7833 | (in_sizeof | |
7834 | ? "sizeof" | |
7835 | : (in_typeof ? "typeof" : "alignof"))); | |
7836 | ||
51e29401 RS |
7837 | return ref; |
7838 | } | |
7839 | ||
f8893e47 | 7840 | /* Process the specs, declarator and width (NULL if omitted) |
51e29401 | 7841 | of a structure component, returning a FIELD_DECL node. |
2ff7cce4 | 7842 | WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node. |
b9baeecd | 7843 | DECL_ATTRS is as for grokdeclarator. |
51e29401 | 7844 | |
3d10ed6c AH |
7845 | LOC is the location of the structure component. |
7846 | ||
51e29401 RS |
7847 | This is done during the parsing of the struct declaration. |
7848 | The FIELD_DECL nodes are chained together and the lot of them | |
7849 | are ultimately passed to `build_struct' to make the RECORD_TYPE node. */ | |
7850 | ||
7851 | tree | |
3d10ed6c AH |
7852 | grokfield (location_t loc, |
7853 | struct c_declarator *declarator, struct c_declspecs *declspecs, | |
b9baeecd | 7854 | tree width, tree *decl_attrs) |
51e29401 RS |
7855 | { |
7856 | tree value; | |
7857 | ||
f8893e47 JM |
7858 | if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE |
7859 | && width == NULL_TREE) | |
3e96a2fd | 7860 | { |
750491fc RH |
7861 | /* This is an unnamed decl. |
7862 | ||
7863 | If we have something of the form "union { list } ;" then this | |
7864 | is the anonymous union extension. Similarly for struct. | |
7865 | ||
7866 | If this is something of the form "struct foo;", then | |
478a1c5b ILT |
7867 | If MS or Plan 9 extensions are enabled, this is handled as |
7868 | an anonymous struct. | |
750491fc RH |
7869 | Otherwise this is a forward declaration of a structure tag. |
7870 | ||
7871 | If this is something of the form "foo;" and foo is a TYPE_DECL, then | |
4bdd0a60 | 7872 | If foo names a structure or union without a tag, then this |
48b0b196 | 7873 | is an anonymous struct (this is permitted by C11). |
478a1c5b ILT |
7874 | If MS or Plan 9 extensions are enabled and foo names a |
7875 | structure, then again this is an anonymous struct. | |
750491fc RH |
7876 | Otherwise this is an error. |
7877 | ||
95bd1dd7 | 7878 | Oh what a horrid tangled web we weave. I wonder if MS consciously |
750491fc RH |
7879 | took this from Plan 9 or if it was an accident of implementation |
7880 | that took root before someone noticed the bug... */ | |
7881 | ||
deb176fa | 7882 | tree type = declspecs->type; |
216a5f1b | 7883 | bool ok = false; |
85d49058 | 7884 | |
8595f67b | 7885 | if (RECORD_OR_UNION_TYPE_P (type) |
ff8e2159 JM |
7886 | && (flag_ms_extensions |
7887 | || flag_plan9_extensions | |
7888 | || !declspecs->typedef_p)) | |
750491fc | 7889 | { |
478a1c5b | 7890 | if (flag_ms_extensions || flag_plan9_extensions) |
216a5f1b | 7891 | ok = true; |
ff8e2159 | 7892 | else if (TYPE_NAME (type) == NULL) |
216a5f1b | 7893 | ok = true; |
750491fc | 7894 | else |
216a5f1b | 7895 | ok = false; |
750491fc | 7896 | } |
216a5f1b | 7897 | if (!ok) |
3e96a2fd | 7898 | { |
3d10ed6c | 7899 | pedwarn (loc, 0, "declaration does not declare anything"); |
3e96a2fd DD |
7900 | return NULL_TREE; |
7901 | } | |
35aff4fb MP |
7902 | if (flag_isoc99) |
7903 | pedwarn_c99 (loc, OPT_Wpedantic, | |
4bdd0a60 | 7904 | "ISO C99 doesn%'t support unnamed structs/unions"); |
35aff4fb MP |
7905 | else |
7906 | pedwarn_c99 (loc, OPT_Wpedantic, | |
4bdd0a60 | 7907 | "ISO C90 doesn%'t support unnamed structs/unions"); |
3e96a2fd DD |
7908 | } |
7909 | ||
60919bce | 7910 | value = grokdeclarator (declarator, declspecs, FIELD, false, |
928c19bb | 7911 | width ? &width : NULL, decl_attrs, NULL, NULL, |
b9baeecd | 7912 | DEPRECATED_NORMAL); |
51e29401 | 7913 | |
c2255bc4 | 7914 | finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE); |
dfd48d76 | 7915 | DECL_INITIAL (value) = width; |
7d386d45 JJ |
7916 | if (width) |
7917 | SET_DECL_C_BIT_FIELD (value); | |
51e29401 | 7918 | |
dc491a25 ILT |
7919 | if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE) |
7920 | { | |
7921 | /* If we currently have a binding for this field, set the | |
7922 | in_struct field in the binding, so that we warn about lookups | |
7923 | which find it. */ | |
7924 | struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value)); | |
7925 | if (b != NULL) | |
7926 | { | |
7927 | /* If the in_struct field is not yet set, push it on a list | |
7928 | to be cleared when this struct is finished. */ | |
7929 | if (!b->in_struct) | |
7930 | { | |
9771b263 | 7931 | struct_parse_info->fields.safe_push (b); |
dc491a25 ILT |
7932 | b->in_struct = 1; |
7933 | } | |
7934 | } | |
7935 | } | |
7936 | ||
51e29401 RS |
7937 | return value; |
7938 | } | |
7939 | \f | |
478a1c5b ILT |
7940 | /* Subroutine of detect_field_duplicates: return whether X and Y, |
7941 | which are both fields in the same struct, have duplicate field | |
7942 | names. */ | |
7943 | ||
7944 | static bool | |
7945 | is_duplicate_field (tree x, tree y) | |
7946 | { | |
7947 | if (DECL_NAME (x) != NULL_TREE && DECL_NAME (x) == DECL_NAME (y)) | |
7948 | return true; | |
7949 | ||
7950 | /* When using -fplan9-extensions, an anonymous field whose name is a | |
7951 | typedef can duplicate a field name. */ | |
7952 | if (flag_plan9_extensions | |
7953 | && (DECL_NAME (x) == NULL_TREE || DECL_NAME (y) == NULL_TREE)) | |
7954 | { | |
7955 | tree xt, xn, yt, yn; | |
7956 | ||
7957 | xt = TREE_TYPE (x); | |
7958 | if (DECL_NAME (x) != NULL_TREE) | |
7959 | xn = DECL_NAME (x); | |
3e636daf | 7960 | else if (RECORD_OR_UNION_TYPE_P (xt) |
478a1c5b ILT |
7961 | && TYPE_NAME (xt) != NULL_TREE |
7962 | && TREE_CODE (TYPE_NAME (xt)) == TYPE_DECL) | |
7963 | xn = DECL_NAME (TYPE_NAME (xt)); | |
7964 | else | |
7965 | xn = NULL_TREE; | |
7966 | ||
7967 | yt = TREE_TYPE (y); | |
7968 | if (DECL_NAME (y) != NULL_TREE) | |
7969 | yn = DECL_NAME (y); | |
3e636daf | 7970 | else if (RECORD_OR_UNION_TYPE_P (yt) |
478a1c5b ILT |
7971 | && TYPE_NAME (yt) != NULL_TREE |
7972 | && TREE_CODE (TYPE_NAME (yt)) == TYPE_DECL) | |
7973 | yn = DECL_NAME (TYPE_NAME (yt)); | |
7974 | else | |
7975 | yn = NULL_TREE; | |
7976 | ||
7977 | if (xn != NULL_TREE && xn == yn) | |
7978 | return true; | |
7979 | } | |
7980 | ||
7981 | return false; | |
7982 | } | |
7983 | ||
492fc0ee JM |
7984 | /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST |
7985 | to HTAB, giving errors for any duplicates. */ | |
7986 | ||
7987 | static void | |
703c8606 | 7988 | detect_field_duplicates_hash (tree fieldlist, |
8d67ee55 | 7989 | hash_table<nofree_ptr_hash <tree_node> > *htab) |
492fc0ee JM |
7990 | { |
7991 | tree x, y; | |
703c8606 | 7992 | tree_node **slot; |
492fc0ee | 7993 | |
910ad8de | 7994 | for (x = fieldlist; x ; x = DECL_CHAIN (x)) |
3fa8871b | 7995 | if ((y = DECL_NAME (x)) != NULL_TREE) |
492fc0ee | 7996 | { |
c203e8a7 | 7997 | slot = htab->find_slot (y, INSERT); |
492fc0ee JM |
7998 | if (*slot) |
7999 | { | |
8000 | error ("duplicate member %q+D", x); | |
8001 | DECL_NAME (x) = NULL_TREE; | |
8002 | } | |
8003 | *slot = y; | |
8004 | } | |
3e636daf | 8005 | else if (RECORD_OR_UNION_TYPE_P (TREE_TYPE (x))) |
478a1c5b ILT |
8006 | { |
8007 | detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x)), htab); | |
8008 | ||
8009 | /* When using -fplan9-extensions, an anonymous field whose | |
8010 | name is a typedef can duplicate a field name. */ | |
8011 | if (flag_plan9_extensions | |
8012 | && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE | |
8013 | && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL) | |
8014 | { | |
8015 | tree xn = DECL_NAME (TYPE_NAME (TREE_TYPE (x))); | |
c203e8a7 | 8016 | slot = htab->find_slot (xn, INSERT); |
478a1c5b ILT |
8017 | if (*slot) |
8018 | error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x))); | |
8019 | *slot = xn; | |
8020 | } | |
8021 | } | |
492fc0ee JM |
8022 | } |
8023 | ||
66ea6f4c RH |
8024 | /* Generate an error for any duplicate field names in FIELDLIST. Munge |
8025 | the list such that this does not present a problem later. */ | |
8026 | ||
8027 | static void | |
8028 | detect_field_duplicates (tree fieldlist) | |
8029 | { | |
8030 | tree x, y; | |
8031 | int timeout = 10; | |
8032 | ||
c0c24aa4 | 8033 | /* If the struct is the list of instance variables of an Objective-C |
0dc33c3c NP |
8034 | class, then we need to check all the instance variables of |
8035 | superclasses when checking for duplicates (since you can't have | |
c0c24aa4 | 8036 | an instance variable in a subclass with the same name as an |
0dc33c3c NP |
8037 | instance variable in a superclass). We pass on this job to the |
8038 | Objective-C compiler. objc_detect_field_duplicates() will return | |
8039 | false if we are not checking the list of instance variables and | |
8040 | the C frontend should proceed with the standard field duplicate | |
8041 | checks. If we are checking the list of instance variables, the | |
8042 | ObjC frontend will do the check, emit the errors if needed, and | |
8043 | then return true. */ | |
c0c24aa4 | 8044 | if (c_dialect_objc ()) |
0dc33c3c NP |
8045 | if (objc_detect_field_duplicates (false)) |
8046 | return; | |
c0c24aa4 | 8047 | |
66ea6f4c RH |
8048 | /* First, see if there are more than "a few" fields. |
8049 | This is trivially true if there are zero or one fields. */ | |
b3c1008c | 8050 | if (!fieldlist || !DECL_CHAIN (fieldlist)) |
66ea6f4c | 8051 | return; |
b3c1008c | 8052 | x = fieldlist; |
66ea6f4c RH |
8053 | do { |
8054 | timeout--; | |
492fc0ee | 8055 | if (DECL_NAME (x) == NULL_TREE |
3e636daf | 8056 | && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x))) |
492fc0ee | 8057 | timeout = 0; |
910ad8de | 8058 | x = DECL_CHAIN (x); |
66ea6f4c RH |
8059 | } while (timeout > 0 && x); |
8060 | ||
492fc0ee JM |
8061 | /* If there were "few" fields and no anonymous structures or unions, |
8062 | avoid the overhead of allocating a hash table. Instead just do | |
8063 | the nested traversal thing. */ | |
66ea6f4c RH |
8064 | if (timeout > 0) |
8065 | { | |
f7587ed0 | 8066 | for (x = DECL_CHAIN (fieldlist); x; x = DECL_CHAIN (x)) |
478a1c5b ILT |
8067 | /* When using -fplan9-extensions, we can have duplicates |
8068 | between typedef names and fields. */ | |
8069 | if (DECL_NAME (x) | |
8070 | || (flag_plan9_extensions | |
8071 | && DECL_NAME (x) == NULL_TREE | |
3e636daf | 8072 | && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x)) |
478a1c5b ILT |
8073 | && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE |
8074 | && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL)) | |
66ea6f4c RH |
8075 | { |
8076 | for (y = fieldlist; y != x; y = TREE_CHAIN (y)) | |
478a1c5b | 8077 | if (is_duplicate_field (y, x)) |
66ea6f4c | 8078 | { |
dee15844 | 8079 | error ("duplicate member %q+D", x); |
66ea6f4c RH |
8080 | DECL_NAME (x) = NULL_TREE; |
8081 | } | |
8082 | } | |
8083 | } | |
8084 | else | |
8085 | { | |
8d67ee55 | 8086 | hash_table<nofree_ptr_hash <tree_node> > htab (37); |
c203e8a7 | 8087 | detect_field_duplicates_hash (fieldlist, &htab); |
66ea6f4c RH |
8088 | } |
8089 | } | |
8090 | ||
dc491a25 ILT |
8091 | /* Finish up struct info used by -Wc++-compat. */ |
8092 | ||
8093 | static void | |
bc51ace3 PK |
8094 | warn_cxx_compat_finish_struct (tree fieldlist, enum tree_code code, |
8095 | location_t record_loc) | |
dc491a25 ILT |
8096 | { |
8097 | unsigned int ix; | |
8098 | tree x; | |
8099 | struct c_binding *b; | |
8100 | ||
bc51ace3 PK |
8101 | if (fieldlist == NULL_TREE) |
8102 | { | |
8103 | if (code == RECORD_TYPE) | |
8104 | warning_at (record_loc, OPT_Wc___compat, | |
8105 | "empty struct has size 0 in C, size 1 in C++"); | |
8106 | else | |
8107 | warning_at (record_loc, OPT_Wc___compat, | |
8108 | "empty union has size 0 in C, size 1 in C++"); | |
8109 | } | |
8110 | ||
dc491a25 ILT |
8111 | /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in |
8112 | the current struct. We do this now at the end of the struct | |
8113 | because the flag is used to issue visibility warnings, and we | |
8114 | only want to issue those warnings if the type is referenced | |
8115 | outside of the struct declaration. */ | |
9771b263 | 8116 | FOR_EACH_VEC_ELT (struct_parse_info->struct_types, ix, x) |
dc491a25 ILT |
8117 | C_TYPE_DEFINED_IN_STRUCT (x) = 1; |
8118 | ||
8119 | /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of | |
8120 | typedefs used when declaring fields in this struct. If the name | |
8121 | of any of the fields is also a typedef name then the struct would | |
8122 | not parse in C++, because the C++ lookup rules say that the | |
8123 | typedef name would be looked up in the context of the struct, and | |
8124 | would thus be the field rather than the typedef. */ | |
9771b263 | 8125 | if (!struct_parse_info->typedefs_seen.is_empty () |
dc491a25 ILT |
8126 | && fieldlist != NULL_TREE) |
8127 | { | |
6e2830c3 TS |
8128 | /* Use a hash_set<tree> using the name of the typedef. We can use |
8129 | a hash_set<tree> because identifiers are interned. */ | |
8130 | hash_set<tree> tset; | |
dc491a25 | 8131 | |
9771b263 | 8132 | FOR_EACH_VEC_ELT (struct_parse_info->typedefs_seen, ix, x) |
6e2830c3 | 8133 | tset.add (DECL_NAME (x)); |
dc491a25 | 8134 | |
910ad8de | 8135 | for (x = fieldlist; x != NULL_TREE; x = DECL_CHAIN (x)) |
dc491a25 | 8136 | { |
a75de692 | 8137 | if (DECL_NAME (x) != NULL_TREE |
6e2830c3 | 8138 | && tset.contains (DECL_NAME (x))) |
dc491a25 ILT |
8139 | { |
8140 | warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat, | |
8141 | ("using %qD as both field and typedef name is " | |
8142 | "invalid in C++"), | |
8143 | x); | |
8144 | /* FIXME: It would be nice to report the location where | |
8145 | the typedef name is used. */ | |
8146 | } | |
8147 | } | |
dc491a25 ILT |
8148 | } |
8149 | ||
8150 | /* For each field which has a binding and which was not defined in | |
8151 | an enclosing struct, clear the in_struct field. */ | |
9771b263 | 8152 | FOR_EACH_VEC_ELT (struct_parse_info->fields, ix, b) |
dc491a25 ILT |
8153 | b->in_struct = 0; |
8154 | } | |
8155 | ||
6836632e NS |
8156 | /* Function to help qsort sort FIELD_DECLs by name order. */ |
8157 | ||
8158 | static int | |
8159 | field_decl_cmp (const void *x_p, const void *y_p) | |
8160 | { | |
8161 | const tree *const x = (const tree *) x_p; | |
8162 | const tree *const y = (const tree *) y_p; | |
8163 | ||
8164 | if (DECL_NAME (*x) == DECL_NAME (*y)) | |
8165 | /* A nontype is "greater" than a type. */ | |
8166 | return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL); | |
8167 | if (DECL_NAME (*x) == NULL_TREE) | |
8168 | return -1; | |
8169 | if (DECL_NAME (*y) == NULL_TREE) | |
8170 | return 1; | |
8171 | if (DECL_NAME (*x) < DECL_NAME (*y)) | |
8172 | return -1; | |
8173 | return 1; | |
8174 | } | |
8175 | ||
51e29401 | 8176 | /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T. |
c2255bc4 | 8177 | LOC is the location of the RECORD_TYPE or UNION_TYPE's definition. |
7a0347ff | 8178 | FIELDLIST is a chain of FIELD_DECL nodes for the fields. |
24b97832 ILT |
8179 | ATTRIBUTES are attributes to be applied to the structure. |
8180 | ||
dc491a25 ILT |
8181 | ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when |
8182 | the struct was started. */ | |
51e29401 RS |
8183 | |
8184 | tree | |
c2255bc4 | 8185 | finish_struct (location_t loc, tree t, tree fieldlist, tree attributes, |
99b1c316 | 8186 | class c_struct_parse_info *enclosing_struct_parse_info) |
51e29401 | 8187 | { |
b3694847 | 8188 | tree x; |
f75fbaf7 | 8189 | bool toplevel = file_scope == current_scope; |
51e29401 RS |
8190 | |
8191 | /* If this type was previously laid out as a forward reference, | |
8192 | make sure we lay it out again. */ | |
8193 | ||
3fa8871b | 8194 | TYPE_SIZE (t) = NULL_TREE; |
51e29401 | 8195 | |
91d231cb | 8196 | decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); |
10861e9a | 8197 | |
9590fa72 RK |
8198 | if (pedantic) |
8199 | { | |
910ad8de | 8200 | for (x = fieldlist; x; x = DECL_CHAIN (x)) |
4bdd0a60 | 8201 | { |
3fa8871b | 8202 | if (DECL_NAME (x) != NULL_TREE) |
4bdd0a60 | 8203 | break; |
3e636daf | 8204 | if (flag_isoc11 && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x))) |
4bdd0a60 JM |
8205 | break; |
8206 | } | |
9590fa72 | 8207 | |
3fa8871b | 8208 | if (x == NULL_TREE) |
cc0b9d52 JM |
8209 | { |
8210 | if (TREE_CODE (t) == UNION_TYPE) | |
8211 | { | |
8212 | if (fieldlist) | |
c1771a20 | 8213 | pedwarn (loc, OPT_Wpedantic, "union has no named members"); |
cc0b9d52 | 8214 | else |
c1771a20 | 8215 | pedwarn (loc, OPT_Wpedantic, "union has no members"); |
cc0b9d52 JM |
8216 | } |
8217 | else | |
8218 | { | |
8219 | if (fieldlist) | |
c1771a20 | 8220 | pedwarn (loc, OPT_Wpedantic, "struct has no named members"); |
cc0b9d52 | 8221 | else |
c1771a20 | 8222 | pedwarn (loc, OPT_Wpedantic, "struct has no members"); |
cc0b9d52 JM |
8223 | } |
8224 | } | |
9590fa72 | 8225 | } |
51e29401 | 8226 | |
dfd48d76 | 8227 | /* Install struct as DECL_CONTEXT of each field decl. |
bc15d0ef JM |
8228 | Also process specified field sizes, found in the DECL_INITIAL, |
8229 | storing 0 there after the type has been changed to precision equal | |
8230 | to its width, rather than the precision of the specified standard | |
8231 | type. (Correct layout requires the original type to have been preserved | |
8232 | until now.) */ | |
51e29401 | 8233 | |
e3455240 | 8234 | bool saw_named_field = false; |
910ad8de | 8235 | for (x = fieldlist; x; x = DECL_CHAIN (x)) |
51e29401 | 8236 | { |
4271a6f3 VR |
8237 | if (TREE_TYPE (x) == error_mark_node) |
8238 | continue; | |
8239 | ||
51e29401 | 8240 | DECL_CONTEXT (x) = t; |
646c0835 | 8241 | |
51e29401 RS |
8242 | /* If any field is const, the structure type is pseudo-const. */ |
8243 | if (TREE_READONLY (x)) | |
8244 | C_TYPE_FIELDS_READONLY (t) = 1; | |
8245 | else | |
8246 | { | |
8247 | /* A field that is pseudo-const makes the structure likewise. */ | |
51f4ec66 | 8248 | tree t1 = strip_array_types (TREE_TYPE (x)); |
3e636daf | 8249 | if (RECORD_OR_UNION_TYPE_P (t1) && C_TYPE_FIELDS_READONLY (t1)) |
51e29401 RS |
8250 | C_TYPE_FIELDS_READONLY (t) = 1; |
8251 | } | |
8252 | ||
8253 | /* Any field that is volatile means variables of this type must be | |
8254 | treated in some ways as volatile. */ | |
8255 | if (TREE_THIS_VOLATILE (x)) | |
8256 | C_TYPE_FIELDS_VOLATILE (t) = 1; | |
8257 | ||
8258 | /* Any field of nominal variable size implies structure is too. */ | |
8259 | if (C_DECL_VARIABLE_SIZE (x)) | |
8260 | C_TYPE_VARIABLE_SIZE (t) = 1; | |
8261 | ||
7d386d45 | 8262 | if (DECL_C_BIT_FIELD (x)) |
dfd48d76 | 8263 | { |
ae7e9ddd | 8264 | unsigned HOST_WIDE_INT width = tree_to_uhwi (DECL_INITIAL (x)); |
2ff7cce4 JM |
8265 | DECL_SIZE (x) = bitsize_int (width); |
8266 | DECL_BIT_FIELD (x) = 1; | |
dfd48d76 NB |
8267 | } |
8268 | ||
2cd36c22 AN |
8269 | if (TYPE_PACKED (t) |
8270 | && (DECL_BIT_FIELD (x) | |
8271 | || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT)) | |
8272 | DECL_PACKED (x) = 1; | |
8273 | ||
ffc5c6a9 RH |
8274 | /* Detect flexible array member in an invalid context. */ |
8275 | if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE | |
8276 | && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE | |
8277 | && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE | |
8278 | && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE) | |
8279 | { | |
8280 | if (TREE_CODE (t) == UNION_TYPE) | |
d915eec0 | 8281 | { |
c2255bc4 | 8282 | error_at (DECL_SOURCE_LOCATION (x), |
c5d75364 | 8283 | "flexible array member in union"); |
d915eec0 JJ |
8284 | TREE_TYPE (x) = error_mark_node; |
8285 | } | |
910ad8de | 8286 | else if (DECL_CHAIN (x) != NULL_TREE) |
d915eec0 | 8287 | { |
c2255bc4 | 8288 | error_at (DECL_SOURCE_LOCATION (x), |
c5d75364 | 8289 | "flexible array member not at end of struct"); |
d915eec0 JJ |
8290 | TREE_TYPE (x) = error_mark_node; |
8291 | } | |
3f75a254 | 8292 | else if (!saw_named_field) |
d915eec0 | 8293 | { |
c2255bc4 | 8294 | error_at (DECL_SOURCE_LOCATION (x), |
f618a472 MP |
8295 | "flexible array member in a struct with no named " |
8296 | "members"); | |
d915eec0 JJ |
8297 | TREE_TYPE (x) = error_mark_node; |
8298 | } | |
ffc5c6a9 | 8299 | } |
2984fe64 | 8300 | |
c5d75364 | 8301 | if (pedantic && TREE_CODE (t) == RECORD_TYPE |
2984fe64 | 8302 | && flexible_array_type_p (TREE_TYPE (x))) |
c1771a20 | 8303 | pedwarn (DECL_SOURCE_LOCATION (x), OPT_Wpedantic, |
c5d75364 | 8304 | "invalid use of structure with flexible array member"); |
2984fe64 | 8305 | |
4bdd0a60 | 8306 | if (DECL_NAME (x) |
3e636daf | 8307 | || RECORD_OR_UNION_TYPE_P (TREE_TYPE (x))) |
e3455240 | 8308 | saw_named_field = true; |
05bccae2 | 8309 | } |
51e29401 | 8310 | |
66ea6f4c | 8311 | detect_field_duplicates (fieldlist); |
51e29401 RS |
8312 | |
8313 | /* Now we have the nearly final fieldlist. Record it, | |
8314 | then lay out the structure or union (including the fields). */ | |
8315 | ||
8316 | TYPE_FIELDS (t) = fieldlist; | |
8317 | ||
ee45a32d EB |
8318 | maybe_apply_pragma_scalar_storage_order (t); |
8319 | ||
51e29401 RS |
8320 | layout_type (t); |
8321 | ||
26d40c3d JM |
8322 | if (TYPE_SIZE_UNIT (t) |
8323 | && TREE_CODE (TYPE_SIZE_UNIT (t)) == INTEGER_CST | |
8324 | && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t)) | |
8325 | && !valid_constant_size_p (TYPE_SIZE_UNIT (t))) | |
8326 | error ("type %qT is too large", t); | |
8327 | ||
ee45a32d EB |
8328 | /* Give bit-fields their proper types and rewrite the type of array fields |
8329 | with scalar component if the enclosing type has reverse storage order. */ | |
8330 | for (tree field = fieldlist; field; field = DECL_CHAIN (field)) | |
8331 | { | |
8332 | if (TREE_CODE (field) == FIELD_DECL | |
8333 | && DECL_INITIAL (field) | |
8334 | && TREE_TYPE (field) != error_mark_node) | |
bc15d0ef JM |
8335 | { |
8336 | unsigned HOST_WIDE_INT width | |
ee45a32d EB |
8337 | = tree_to_uhwi (DECL_INITIAL (field)); |
8338 | tree type = TREE_TYPE (field); | |
bc15d0ef | 8339 | if (width != TYPE_PRECISION (type)) |
48cc8d3b | 8340 | { |
ee45a32d | 8341 | TREE_TYPE (field) |
0b359b01 | 8342 | = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type)); |
899ca90e | 8343 | SET_DECL_MODE (field, TYPE_MODE (TREE_TYPE (field))); |
48cc8d3b | 8344 | } |
3fa8871b | 8345 | DECL_INITIAL (field) = NULL_TREE; |
bc15d0ef | 8346 | } |
ee45a32d EB |
8347 | else if (TYPE_REVERSE_STORAGE_ORDER (t) |
8348 | && TREE_CODE (field) == FIELD_DECL | |
8349 | && TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE) | |
8350 | { | |
8351 | tree ftype = TREE_TYPE (field); | |
8352 | tree ctype = strip_array_types (ftype); | |
8353 | if (!RECORD_OR_UNION_TYPE_P (ctype) && TYPE_MODE (ctype) != QImode) | |
8354 | { | |
8355 | tree fmain_type = TYPE_MAIN_VARIANT (ftype); | |
8356 | tree *typep = &fmain_type; | |
8357 | do { | |
8358 | *typep = build_distinct_type_copy (*typep); | |
8359 | TYPE_REVERSE_STORAGE_ORDER (*typep) = 1; | |
8360 | typep = &TREE_TYPE (*typep); | |
8361 | } while (TREE_CODE (*typep) == ARRAY_TYPE); | |
8362 | TREE_TYPE (field) | |
8363 | = c_build_qualified_type (fmain_type, TYPE_QUALS (ftype)); | |
8364 | } | |
8365 | } | |
8366 | } | |
51e29401 | 8367 | |
ffc5c6a9 RH |
8368 | /* Now we have the truly final field list. |
8369 | Store it in this type and in the variants. */ | |
51e29401 RS |
8370 | |
8371 | TYPE_FIELDS (t) = fieldlist; | |
8372 | ||
d07605f5 | 8373 | /* If there are lots of fields, sort so we can look through them fast. |
6614fd40 | 8374 | We arbitrarily consider 16 or more elts to be "a lot". */ |
d07605f5 AP |
8375 | |
8376 | { | |
8377 | int len = 0; | |
8378 | ||
910ad8de | 8379 | for (x = fieldlist; x; x = DECL_CHAIN (x)) |
d07605f5 | 8380 | { |
c22cacf3 MS |
8381 | if (len > 15 || DECL_NAME (x) == NULL) |
8382 | break; | |
8383 | len += 1; | |
d07605f5 AP |
8384 | } |
8385 | ||
8386 | if (len > 15) | |
8387 | { | |
c22cacf3 MS |
8388 | tree *field_array; |
8389 | struct lang_type *space; | |
8390 | struct sorted_fields_type *space2; | |
e13e48e7 | 8391 | |
c22cacf3 | 8392 | len += list_length (x); |
e13e48e7 | 8393 | |
c22cacf3 MS |
8394 | /* Use the same allocation policy here that make_node uses, to |
8395 | ensure that this lives as long as the rest of the struct decl. | |
8396 | All decls in an inline function need to be saved. */ | |
e13e48e7 | 8397 | |
766090c2 TS |
8398 | space = ggc_cleared_alloc<struct lang_type> (); |
8399 | space2 = (sorted_fields_type *) ggc_internal_alloc | |
a9429e29 | 8400 | (sizeof (struct sorted_fields_type) + len * sizeof (tree)); |
e13e48e7 | 8401 | |
c22cacf3 | 8402 | len = 0; |
d07605f5 AP |
8403 | space->s = space2; |
8404 | field_array = &space2->elts[0]; | |
910ad8de | 8405 | for (x = fieldlist; x; x = DECL_CHAIN (x)) |
c22cacf3 MS |
8406 | { |
8407 | field_array[len++] = x; | |
8408 | ||
8409 | /* If there is anonymous struct or union, break out of the loop. */ | |
8410 | if (DECL_NAME (x) == NULL) | |
8411 | break; | |
8412 | } | |
8413 | /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */ | |
8414 | if (x == NULL) | |
8415 | { | |
8416 | TYPE_LANG_SPECIFIC (t) = space; | |
8417 | TYPE_LANG_SPECIFIC (t)->s->len = len; | |
8418 | field_array = TYPE_LANG_SPECIFIC (t)->s->elts; | |
8419 | qsort (field_array, len, sizeof (tree), field_decl_cmp); | |
8420 | } | |
d07605f5 AP |
8421 | } |
8422 | } | |
e13e48e7 | 8423 | |
f461f938 RB |
8424 | /* If this was supposed to be a transparent union, but we can't |
8425 | make it one, warn and turn off the flag. */ | |
8426 | if (TREE_CODE (t) == UNION_TYPE | |
8427 | && TYPE_TRANSPARENT_AGGR (t) | |
8428 | && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))) | |
8429 | { | |
8430 | TYPE_TRANSPARENT_AGGR (t) = 0; | |
8431 | warning_at (loc, 0, "union cannot be made transparent"); | |
8432 | } | |
8433 | ||
3a5d2ba4 JJ |
8434 | /* Note: C_TYPE_INCOMPLETE_VARS overloads TYPE_VFIELD which is used |
8435 | in dwarf2out via rest_of_decl_compilation below and means | |
8436 | something totally different. Since we will be clearing | |
8437 | C_TYPE_INCOMPLETE_VARS shortly after we iterate through them, | |
8438 | clear it ahead of time and avoid problems in dwarf2out. Ideally, | |
8439 | C_TYPE_INCOMPLETE_VARS should use some language specific | |
8440 | node. */ | |
8441 | tree incomplete_vars = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)); | |
51e29401 RS |
8442 | for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x)) |
8443 | { | |
8444 | TYPE_FIELDS (x) = TYPE_FIELDS (t); | |
8445 | TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t); | |
f461f938 | 8446 | TYPE_TRANSPARENT_AGGR (x) = TYPE_TRANSPARENT_AGGR (t); |
692a7aa3 JM |
8447 | C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t); |
8448 | C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t); | |
8449 | C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t); | |
3a5d2ba4 | 8450 | C_TYPE_INCOMPLETE_VARS (x) = NULL_TREE; |
51e29401 RS |
8451 | } |
8452 | ||
14ec014e JJ |
8453 | /* Update type location to the one of the definition, instead of e.g. |
8454 | a forward declaration. */ | |
8455 | if (TYPE_STUB_DECL (t)) | |
8456 | DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc; | |
8457 | ||
8458 | /* Finish debugging output for this type. */ | |
8459 | rest_of_type_compilation (t, toplevel); | |
8460 | ||
51e29401 | 8461 | /* If this structure or union completes the type of any previous |
3a5d2ba4 | 8462 | variable declaration, lay it out and output its rtl. */ |
d7438551 | 8463 | for (x = incomplete_vars; x; x = TREE_CHAIN (x)) |
51e29401 | 8464 | { |
bf7a697f ZW |
8465 | tree decl = TREE_VALUE (x); |
8466 | if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE) | |
8467 | layout_array_type (TREE_TYPE (decl)); | |
8468 | if (TREE_CODE (decl) != TYPE_DECL) | |
8469 | { | |
8470 | layout_decl (decl, 0); | |
8471 | if (c_dialect_objc ()) | |
8472 | objc_check_decl (decl); | |
0e6df31e | 8473 | rest_of_decl_compilation (decl, toplevel, 0); |
51e29401 RS |
8474 | } |
8475 | } | |
8476 | ||
ca6af4f8 RH |
8477 | /* If we're inside a function proper, i.e. not file-scope and not still |
8478 | parsing parameters, then arrange for the size of a variable sized type | |
8479 | to be bound now. */ | |
38e01f9e | 8480 | if (building_stmt_list_p () && variably_modified_type_p (t, NULL_TREE)) |
c2255bc4 AH |
8481 | add_stmt (build_stmt (loc, |
8482 | DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t))); | |
ca6af4f8 | 8483 | |
dc491a25 | 8484 | if (warn_cxx_compat) |
bc51ace3 | 8485 | warn_cxx_compat_finish_struct (fieldlist, TREE_CODE (t), loc); |
24b97832 | 8486 | |
bf4fa671 | 8487 | delete struct_parse_info; |
24b97832 | 8488 | |
dc491a25 | 8489 | struct_parse_info = enclosing_struct_parse_info; |
24b97832 ILT |
8490 | |
8491 | /* If this struct is defined inside a struct, add it to | |
dc491a25 ILT |
8492 | struct_types. */ |
8493 | if (warn_cxx_compat | |
8494 | && struct_parse_info != NULL | |
8495 | && !in_sizeof && !in_typeof && !in_alignof) | |
9771b263 | 8496 | struct_parse_info->struct_types.safe_push (t); |
24b97832 | 8497 | |
51e29401 RS |
8498 | return t; |
8499 | } | |
8500 | ||
6836632e NS |
8501 | static struct { |
8502 | gt_pointer_operator new_value; | |
8503 | void *cookie; | |
8504 | } resort_data; | |
8505 | ||
8506 | /* This routine compares two fields like field_decl_cmp but using the | |
8507 | pointer operator in resort_data. */ | |
8508 | ||
8509 | static int | |
8510 | resort_field_decl_cmp (const void *x_p, const void *y_p) | |
8511 | { | |
8512 | const tree *const x = (const tree *) x_p; | |
8513 | const tree *const y = (const tree *) y_p; | |
8514 | ||
8515 | if (DECL_NAME (*x) == DECL_NAME (*y)) | |
8516 | /* A nontype is "greater" than a type. */ | |
8517 | return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL); | |
8518 | if (DECL_NAME (*x) == NULL_TREE) | |
8519 | return -1; | |
8520 | if (DECL_NAME (*y) == NULL_TREE) | |
8521 | return 1; | |
8522 | { | |
8523 | tree d1 = DECL_NAME (*x); | |
8524 | tree d2 = DECL_NAME (*y); | |
8525 | resort_data.new_value (&d1, resort_data.cookie); | |
8526 | resort_data.new_value (&d2, resort_data.cookie); | |
8527 | if (d1 < d2) | |
8528 | return -1; | |
8529 | } | |
8530 | return 1; | |
8531 | } | |
8532 | ||
8533 | /* Resort DECL_SORTED_FIELDS because pointers have been reordered. */ | |
8534 | ||
8535 | void | |
8536 | resort_sorted_fields (void *obj, | |
8537 | void * ARG_UNUSED (orig_obj), | |
8538 | gt_pointer_operator new_value, | |
8539 | void *cookie) | |
8540 | { | |
8541 | struct sorted_fields_type *sf = (struct sorted_fields_type *) obj; | |
8542 | resort_data.new_value = new_value; | |
8543 | resort_data.cookie = cookie; | |
8544 | qsort (&sf->elts[0], sf->len, sizeof (tree), | |
8545 | resort_field_decl_cmp); | |
8546 | } | |
8547 | ||
51e29401 RS |
8548 | /* Lay out the type T, and its element type, and so on. */ |
8549 | ||
8550 | static void | |
35b1a6fa | 8551 | layout_array_type (tree t) |
51e29401 RS |
8552 | { |
8553 | if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE) | |
8554 | layout_array_type (TREE_TYPE (t)); | |
8555 | layout_type (t); | |
8556 | } | |
8557 | \f | |
8558 | /* Begin compiling the definition of an enumeration type. | |
8559 | NAME is its name (or null if anonymous). | |
c2255bc4 | 8560 | LOC is the enum's location. |
51e29401 RS |
8561 | Returns the type object, as yet incomplete. |
8562 | Also records info about it so that build_enumerator | |
8563 | may be used to declare the individual values as they are read. */ | |
8564 | ||
8565 | tree | |
c2255bc4 | 8566 | start_enum (location_t loc, struct c_enum_contents *the_enum, tree name) |
51e29401 | 8567 | { |
24b97832 ILT |
8568 | tree enumtype = NULL_TREE; |
8569 | location_t enumloc = UNKNOWN_LOCATION; | |
51e29401 RS |
8570 | |
8571 | /* If this is the real definition for a previous forward reference, | |
8572 | fill in the contents in the same object that used to be the | |
8573 | forward reference. */ | |
8574 | ||
24b97832 | 8575 | if (name != NULL_TREE) |
2f3bb934 | 8576 | enumtype = lookup_tag (ENUMERAL_TYPE, name, true, &enumloc); |
51e29401 | 8577 | |
2f3bb934 | 8578 | if (enumtype == NULL_TREE || TREE_CODE (enumtype) != ENUMERAL_TYPE) |
51e29401 RS |
8579 | { |
8580 | enumtype = make_node (ENUMERAL_TYPE); | |
c2255bc4 | 8581 | pushtag (loc, name, enumtype); |
51e29401 | 8582 | } |
01e5af5a JJ |
8583 | /* Update type location to the one of the definition, instead of e.g. |
8584 | a forward declaration. */ | |
8585 | else if (TYPE_STUB_DECL (enumtype)) | |
dc949728 MP |
8586 | { |
8587 | enumloc = DECL_SOURCE_LOCATION (TYPE_STUB_DECL (enumtype)); | |
8588 | DECL_SOURCE_LOCATION (TYPE_STUB_DECL (enumtype)) = loc; | |
8589 | } | |
51e29401 | 8590 | |
085e33aa | 8591 | if (C_TYPE_BEING_DEFINED (enumtype)) |
24b97832 | 8592 | error_at (loc, "nested redefinition of %<enum %E%>", name); |
085e33aa | 8593 | |
51e29401 RS |
8594 | C_TYPE_BEING_DEFINED (enumtype) = 1; |
8595 | ||
3fa8871b | 8596 | if (TYPE_VALUES (enumtype) != NULL_TREE) |
51e29401 RS |
8597 | { |
8598 | /* This enum is a named one that has been declared already. */ | |
24b97832 ILT |
8599 | error_at (loc, "redeclaration of %<enum %E%>", name); |
8600 | if (enumloc != UNKNOWN_LOCATION) | |
8601 | inform (enumloc, "originally defined here"); | |
51e29401 RS |
8602 | |
8603 | /* Completely replace its old definition. | |
8604 | The old enumerators remain defined, however. */ | |
3fa8871b | 8605 | TYPE_VALUES (enumtype) = NULL_TREE; |
51e29401 RS |
8606 | } |
8607 | ||
7114359f TT |
8608 | the_enum->enum_next_value = integer_zero_node; |
8609 | the_enum->enum_overflow = 0; | |
51e29401 | 8610 | |
02eb6e90 | 8611 | if (flag_short_enums) |
8cbababc JH |
8612 | for (tree v = TYPE_MAIN_VARIANT (enumtype); v; v = TYPE_NEXT_VARIANT (v)) |
8613 | TYPE_PACKED (v) = 1; | |
02eb6e90 | 8614 | |
24b97832 ILT |
8615 | /* FIXME: This will issue a warning for a use of a type defined |
8616 | within sizeof in a statement expr. This is not terribly serious | |
8617 | as C++ doesn't permit statement exprs within sizeof anyhow. */ | |
8618 | if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof)) | |
8619 | warning_at (loc, OPT_Wc___compat, | |
8620 | "defining type in %qs expression is invalid in C++", | |
8621 | (in_sizeof | |
8622 | ? "sizeof" | |
8623 | : (in_typeof ? "typeof" : "alignof"))); | |
8624 | ||
51e29401 RS |
8625 | return enumtype; |
8626 | } | |
8627 | ||
8628 | /* After processing and defining all the values of an enumeration type, | |
8629 | install their decls in the enumeration type and finish it off. | |
10861e9a RK |
8630 | ENUMTYPE is the type object, VALUES a list of decl-value pairs, |
8631 | and ATTRIBUTES are the specified attributes. | |
51e29401 RS |
8632 | Returns ENUMTYPE. */ |
8633 | ||
8634 | tree | |
35b1a6fa | 8635 | finish_enum (tree enumtype, tree values, tree attributes) |
51e29401 | 8636 | { |
b3694847 | 8637 | tree pair, tem; |
3fa8871b | 8638 | tree minnode = NULL_TREE, maxnode = NULL_TREE; |
807e902e KZ |
8639 | int precision; |
8640 | signop sign; | |
f75fbaf7 | 8641 | bool toplevel = (file_scope == current_scope); |
6de9cd9a | 8642 | struct lang_type *lt; |
51e29401 | 8643 | |
91d231cb | 8644 | decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); |
10861e9a | 8645 | |
51e29401 RS |
8646 | /* Calculate the maximum value of any enumerator in this type. */ |
8647 | ||
59116212 RK |
8648 | if (values == error_mark_node) |
8649 | minnode = maxnode = integer_zero_node; | |
8650 | else | |
f500253d | 8651 | { |
cb3ca04e ZW |
8652 | minnode = maxnode = TREE_VALUE (values); |
8653 | for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair)) | |
f500253d | 8654 | { |
cb3ca04e ZW |
8655 | tree value = TREE_VALUE (pair); |
8656 | if (tree_int_cst_lt (maxnode, value)) | |
8657 | maxnode = value; | |
8658 | if (tree_int_cst_lt (value, minnode)) | |
8659 | minnode = value; | |
f500253d | 8660 | } |
cb3ca04e | 8661 | } |
f500253d | 8662 | |
cb3ca04e ZW |
8663 | /* Construct the final type of this enumeration. It is the same |
8664 | as one of the integral types - the narrowest one that fits, except | |
8665 | that normally we only go as narrow as int - and signed iff any of | |
8666 | the values are negative. */ | |
807e902e KZ |
8667 | sign = (tree_int_cst_sgn (minnode) >= 0) ? UNSIGNED : SIGNED; |
8668 | precision = MAX (tree_int_cst_min_precision (minnode, sign), | |
8669 | tree_int_cst_min_precision (maxnode, sign)); | |
ec8465a5 | 8670 | |
1066e9b5 JJ |
8671 | /* If the precision of the type was specified with an attribute and it |
8672 | was too small, give an error. Otherwise, use it. */ | |
8673 | if (TYPE_PRECISION (enumtype) && lookup_attribute ("mode", attributes)) | |
8674 | { | |
8675 | if (precision > TYPE_PRECISION (enumtype)) | |
8676 | { | |
8677 | TYPE_PRECISION (enumtype) = 0; | |
0ecf545c | 8678 | error ("specified mode too small for enumerated values"); |
1066e9b5 JJ |
8679 | } |
8680 | else | |
8681 | precision = TYPE_PRECISION (enumtype); | |
8682 | } | |
8683 | else | |
8684 | TYPE_PRECISION (enumtype) = 0; | |
8685 | ||
8686 | if (TYPE_PACKED (enumtype) | |
8687 | || precision > TYPE_PRECISION (integer_type_node) | |
8688 | || TYPE_PRECISION (enumtype)) | |
cb3ca04e | 8689 | { |
807e902e | 8690 | tem = c_common_type_for_size (precision, sign == UNSIGNED ? 1 : 0); |
6de9cd9a | 8691 | if (tem == NULL) |
1ada4cd0 | 8692 | { |
d4ee4d25 | 8693 | warning (0, "enumeration values exceed range of largest integer"); |
6de9cd9a | 8694 | tem = long_long_integer_type_node; |
1ada4cd0 | 8695 | } |
f500253d | 8696 | } |
1ada4cd0 | 8697 | else |
807e902e | 8698 | tem = sign == UNSIGNED ? unsigned_type_node : integer_type_node; |
736f85c7 | 8699 | |
6de9cd9a DN |
8700 | TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem); |
8701 | TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem); | |
6de9cd9a | 8702 | TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem); |
fe37c7af | 8703 | SET_TYPE_ALIGN (enumtype, TYPE_ALIGN (tem)); |
3fa8871b | 8704 | TYPE_SIZE (enumtype) = NULL_TREE; |
1066e9b5 | 8705 | TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem); |
ec8465a5 | 8706 | |
51e29401 RS |
8707 | layout_type (enumtype); |
8708 | ||
59116212 | 8709 | if (values != error_mark_node) |
75b46437 | 8710 | { |
cb3ca04e ZW |
8711 | /* Change the type of the enumerators to be the enum type. We |
8712 | need to do this irrespective of the size of the enum, for | |
8713 | proper type checking. Replace the DECL_INITIALs of the | |
8714 | enumerators, and the value slots of the list, with copies | |
8715 | that have the enum type; they cannot be modified in place | |
8716 | because they may be shared (e.g. integer_zero_node) Finally, | |
8717 | change the purpose slots to point to the names of the decls. */ | |
59116212 RK |
8718 | for (pair = values; pair; pair = TREE_CHAIN (pair)) |
8719 | { | |
cb3ca04e | 8720 | tree enu = TREE_PURPOSE (pair); |
6de9cd9a | 8721 | tree ini = DECL_INITIAL (enu); |
51e29401 | 8722 | |
cb3ca04e | 8723 | TREE_TYPE (enu) = enumtype; |
736f85c7 AO |
8724 | |
8725 | /* The ISO C Standard mandates enumerators to have type int, | |
8726 | even though the underlying type of an enum type is | |
85790e66 | 8727 | unspecified. However, GCC allows enumerators of any |
a7e72022 MLI |
8728 | integer type as an extensions. build_enumerator() |
8729 | converts any enumerators that fit in an int to type int, | |
8730 | to avoid promotions to unsigned types when comparing | |
8731 | integers with enumerators that fit in the int range. | |
8732 | When -pedantic is given, build_enumerator() would have | |
8733 | already warned about those that don't fit. Here we | |
8734 | convert the rest to the enumerator type. */ | |
8735 | if (TREE_TYPE (ini) != integer_type_node) | |
8736 | ini = convert (enumtype, ini); | |
cb3ca04e | 8737 | |
6de9cd9a | 8738 | DECL_INITIAL (enu) = ini; |
cb3ca04e | 8739 | TREE_PURPOSE (pair) = DECL_NAME (enu); |
6de9cd9a | 8740 | TREE_VALUE (pair) = ini; |
cb3ca04e | 8741 | } |
51e29401 | 8742 | |
59116212 RK |
8743 | TYPE_VALUES (enumtype) = values; |
8744 | } | |
51e29401 | 8745 | |
6de9cd9a DN |
8746 | /* Record the min/max values so that we can warn about bit-field |
8747 | enumerations that are too small for the values. */ | |
766090c2 | 8748 | lt = ggc_cleared_alloc<struct lang_type> (); |
6de9cd9a DN |
8749 | lt->enum_min = minnode; |
8750 | lt->enum_max = maxnode; | |
8751 | TYPE_LANG_SPECIFIC (enumtype) = lt; | |
8752 | ||
fbe23ee7 RS |
8753 | /* Fix up all variant types of this enum type. */ |
8754 | for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem)) | |
8755 | { | |
cb3ca04e ZW |
8756 | if (tem == enumtype) |
8757 | continue; | |
fbe23ee7 RS |
8758 | TYPE_VALUES (tem) = TYPE_VALUES (enumtype); |
8759 | TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype); | |
8760 | TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype); | |
8761 | TYPE_SIZE (tem) = TYPE_SIZE (enumtype); | |
def9b006 | 8762 | TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype); |
179d2f74 | 8763 | SET_TYPE_MODE (tem, TYPE_MODE (enumtype)); |
fbe23ee7 | 8764 | TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype); |
fe37c7af | 8765 | SET_TYPE_ALIGN (tem, TYPE_ALIGN (enumtype)); |
11cf4d18 | 8766 | TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype); |
8df83eae | 8767 | TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype); |
6de9cd9a | 8768 | TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype); |
fbe23ee7 RS |
8769 | } |
8770 | ||
51e29401 RS |
8771 | /* Finish debugging output for this type. */ |
8772 | rest_of_type_compilation (enumtype, toplevel); | |
8773 | ||
24b97832 | 8774 | /* If this enum is defined inside a struct, add it to |
dc491a25 ILT |
8775 | struct_types. */ |
8776 | if (warn_cxx_compat | |
8777 | && struct_parse_info != NULL | |
8778 | && !in_sizeof && !in_typeof && !in_alignof) | |
9771b263 | 8779 | struct_parse_info->struct_types.safe_push (enumtype); |
24b97832 | 8780 | |
51e29401 RS |
8781 | return enumtype; |
8782 | } | |
8783 | ||
8784 | /* Build and install a CONST_DECL for one value of the | |
8785 | current enumeration type (one that was begun with start_enum). | |
7370e0da AC |
8786 | DECL_LOC is the location of the enumerator. |
8787 | LOC is the location of the '=' operator if any, DECL_LOC otherwise. | |
51e29401 RS |
8788 | Return a tree-list containing the CONST_DECL and its value. |
8789 | Assignment of sequential values by default is handled here. */ | |
8790 | ||
8791 | tree | |
7370e0da | 8792 | build_enumerator (location_t decl_loc, location_t loc, |
c2255bc4 | 8793 | struct c_enum_contents *the_enum, tree name, tree value) |
51e29401 | 8794 | { |
b3694847 | 8795 | tree decl, type; |
51e29401 RS |
8796 | |
8797 | /* Validate and default VALUE. */ | |
8798 | ||
3fa8871b | 8799 | if (value != NULL_TREE) |
e681c5a1 | 8800 | { |
f75fbaf7 ZW |
8801 | /* Don't issue more errors for error_mark_node (i.e. an |
8802 | undeclared identifier) - just ignore the value expression. */ | |
8803 | if (value == error_mark_node) | |
3fa8871b | 8804 | value = NULL_TREE; |
6895bac8 | 8805 | else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))) |
25a1019f | 8806 | { |
c2255bc4 AH |
8807 | error_at (loc, "enumerator value for %qE is not an integer constant", |
8808 | name); | |
3fa8871b | 8809 | value = NULL_TREE; |
25a1019f | 8810 | } |
e681c5a1 RS |
8811 | else |
8812 | { | |
6895bac8 JM |
8813 | if (TREE_CODE (value) != INTEGER_CST) |
8814 | { | |
8815 | value = c_fully_fold (value, false, NULL); | |
8816 | if (TREE_CODE (value) == INTEGER_CST) | |
c1771a20 | 8817 | pedwarn (loc, OPT_Wpedantic, |
6895bac8 JM |
8818 | "enumerator value for %qE is not an integer " |
8819 | "constant expression", name); | |
8820 | } | |
8821 | if (TREE_CODE (value) != INTEGER_CST) | |
8822 | { | |
8823 | error ("enumerator value for %qE is not an integer constant", | |
8824 | name); | |
3fa8871b | 8825 | value = NULL_TREE; |
6895bac8 JM |
8826 | } |
8827 | else | |
8828 | { | |
8829 | value = default_conversion (value); | |
8830 | constant_expression_warning (value); | |
8831 | } | |
e681c5a1 RS |
8832 | } |
8833 | } | |
51e29401 RS |
8834 | |
8835 | /* Default based on previous value. */ | |
8836 | /* It should no longer be possible to have NON_LVALUE_EXPR | |
8837 | in the default. */ | |
3fa8871b | 8838 | if (value == NULL_TREE) |
93e3ba4f | 8839 | { |
7114359f TT |
8840 | value = the_enum->enum_next_value; |
8841 | if (the_enum->enum_overflow) | |
c2255bc4 | 8842 | error_at (loc, "overflow in enumeration values"); |
93e3ba4f | 8843 | } |
85790e66 MLI |
8844 | /* Even though the underlying type of an enum is unspecified, the |
8845 | type of enumeration constants is explicitly defined as int | |
8846 | (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as | |
8847 | an extension. */ | |
8848 | else if (!int_fits_type_p (value, integer_type_node)) | |
c1771a20 | 8849 | pedwarn (loc, OPT_Wpedantic, |
509c9d60 | 8850 | "ISO C restricts enumerator values to range of %<int%>"); |
51e29401 | 8851 | |
a7e72022 MLI |
8852 | /* The ISO C Standard mandates enumerators to have type int, even |
8853 | though the underlying type of an enum type is unspecified. | |
8854 | However, GCC allows enumerators of any integer type as an | |
8855 | extensions. Here we convert any enumerators that fit in an int | |
8856 | to type int, to avoid promotions to unsigned types when comparing | |
8857 | integers with enumerators that fit in the int range. When | |
8858 | -pedantic is given, we would have already warned about those that | |
8859 | don't fit. We have to do this here rather than in finish_enum | |
8860 | because this value may be used to define more enumerators. */ | |
8861 | if (int_fits_type_p (value, integer_type_node)) | |
8862 | value = convert (integer_type_node, value); | |
8863 | ||
51e29401 | 8864 | /* Set basis for default for next value. */ |
ba47d38d | 8865 | the_enum->enum_next_value |
8400e75e | 8866 | = build_binary_op (EXPR_LOC_OR_LOC (value, input_location), |
30af3a2b | 8867 | PLUS_EXPR, value, integer_one_node, false); |
7114359f | 8868 | the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value); |
51e29401 RS |
8869 | |
8870 | /* Now create a declaration for the enum value name. */ | |
8871 | ||
75b46437 | 8872 | type = TREE_TYPE (value); |
b0c48229 NB |
8873 | type = c_common_type_for_size (MAX (TYPE_PRECISION (type), |
8874 | TYPE_PRECISION (integer_type_node)), | |
8875 | (TYPE_PRECISION (type) | |
8876 | >= TYPE_PRECISION (integer_type_node) | |
8df83eae | 8877 | && TYPE_UNSIGNED (type))); |
75b46437 | 8878 | |
7370e0da | 8879 | decl = build_decl (decl_loc, CONST_DECL, name, type); |
0543d026 | 8880 | DECL_INITIAL (decl) = convert (type, value); |
51e29401 RS |
8881 | pushdecl (decl); |
8882 | ||
4dd7201e | 8883 | return tree_cons (decl, value, NULL_TREE); |
51e29401 | 8884 | } |
8f17b5c5 | 8885 | |
51e29401 RS |
8886 | \f |
8887 | /* Create the FUNCTION_DECL for a function definition. | |
f7a4cec0 | 8888 | DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of |
5730cf69 | 8889 | the declaration; they describe the function's name and the type it returns, |
51e29401 RS |
8890 | but twisted together in a fashion that parallels the syntax of C. |
8891 | ||
8892 | This function creates a binding context for the function body | |
8893 | as well as setting up the FUNCTION_DECL in current_function_decl. | |
8894 | ||
e3455240 MP |
8895 | Returns true on success. If the DECLARATOR is not suitable for a function |
8896 | (it defines a datum instead), we return false to report a parse error. */ | |
51e29401 | 8897 | |
e3455240 | 8898 | bool |
deb176fa | 8899 | start_function (struct c_declspecs *declspecs, struct c_declarator *declarator, |
f8893e47 | 8900 | tree attributes) |
51e29401 RS |
8901 | { |
8902 | tree decl1, old_decl; | |
b785f485 | 8903 | tree restype, resdecl; |
c2255bc4 | 8904 | location_t loc; |
51e29401 | 8905 | |
0f41302f | 8906 | current_function_returns_value = 0; /* Assume, until we see it does. */ |
51e29401 | 8907 | current_function_returns_null = 0; |
5ce89b2e | 8908 | current_function_returns_abnormally = 0; |
51e29401 | 8909 | warn_about_return_type = 0; |
506e2710 RH |
8910 | c_switch_stack = NULL; |
8911 | ||
8912 | /* Indicate no valid break/continue context by setting these variables | |
8913 | to some non-null, non-label value. We'll notice and emit the proper | |
8914 | error message in c_finish_bc_stmt. */ | |
8915 | c_break_label = c_cont_label = size_zero_node; | |
51e29401 | 8916 | |
0da300cd | 8917 | decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL, |
928c19bb | 8918 | &attributes, NULL, NULL, DEPRECATED_NORMAL); |
ea5b45b6 | 8919 | invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION, decl1); |
51e29401 RS |
8920 | |
8921 | /* If the declarator is not suitable for a function definition, | |
8922 | cause a syntax error. */ | |
3fa8871b | 8923 | if (decl1 == NULL_TREE |
560ad308 | 8924 | || TREE_CODE (decl1) != FUNCTION_DECL) |
e3455240 | 8925 | return false; |
51e29401 | 8926 | |
c2255bc4 AH |
8927 | loc = DECL_SOURCE_LOCATION (decl1); |
8928 | ||
5f88ba10 JJ |
8929 | /* A nested function is not global. */ |
8930 | if (current_function_decl != NULL_TREE) | |
8931 | TREE_PUBLIC (decl1) = 0; | |
8932 | ||
acf0174b | 8933 | c_decl_attributes (&decl1, attributes, 0); |
7665dfd4 | 8934 | |
9162542e AO |
8935 | if (DECL_DECLARED_INLINE_P (decl1) |
8936 | && DECL_UNINLINABLE (decl1) | |
8937 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1))) | |
c2255bc4 | 8938 | warning_at (loc, OPT_Wattributes, |
0ecf545c MS |
8939 | "inline function %qD given attribute %qs", |
8940 | decl1, "noinline"); | |
9162542e | 8941 | |
4eb7fd83 JJ |
8942 | /* Handle gnu_inline attribute. */ |
8943 | if (declspecs->inline_p | |
da1c7394 | 8944 | && !flag_gnu89_inline |
4eb7fd83 | 8945 | && TREE_CODE (decl1) == FUNCTION_DECL |
6cf59865 JJ |
8946 | && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1)) |
8947 | || current_function_decl)) | |
4eb7fd83 JJ |
8948 | { |
8949 | if (declspecs->storage_class != csc_static) | |
8950 | DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1); | |
8951 | } | |
4eb7fd83 | 8952 | |
51e29401 RS |
8953 | announce_function (decl1); |
8954 | ||
d0f062fb | 8955 | if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1)))) |
51e29401 | 8956 | { |
c2255bc4 | 8957 | error_at (loc, "return type is an incomplete type"); |
51e29401 RS |
8958 | /* Make it return void instead. */ |
8959 | TREE_TYPE (decl1) | |
8960 | = build_function_type (void_type_node, | |
8961 | TYPE_ARG_TYPES (TREE_TYPE (decl1))); | |
8962 | } | |
8963 | ||
8964 | if (warn_about_return_type) | |
92574c7c | 8965 | warn_defaults_to (loc, flag_isoc99 ? OPT_Wimplicit_int |
b67b9225 | 8966 | : (warn_return_type > 0 ? OPT_Wreturn_type |
35aff4fb MP |
8967 | : OPT_Wimplicit_int), |
8968 | "return type defaults to %<int%>"); | |
51e29401 | 8969 | |
51e29401 | 8970 | /* Make the init_value nonzero so pushdecl knows this is not tentative. |
f75fbaf7 | 8971 | error_mark_node is replaced below (in pop_scope) with the BLOCK. */ |
51e29401 RS |
8972 | DECL_INITIAL (decl1) = error_mark_node; |
8973 | ||
8974 | /* If this definition isn't a prototype and we had a prototype declaration | |
46097c76 | 8975 | before, copy the arg type info from that prototype. */ |
f75fbaf7 | 8976 | old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope); |
d8890adf | 8977 | if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL) |
3fa8871b | 8978 | old_decl = NULL_TREE; |
6fb58bba JM |
8979 | current_function_prototype_locus = UNKNOWN_LOCATION; |
8980 | current_function_prototype_built_in = false; | |
8981 | current_function_prototype_arg_types = NULL_TREE; | |
f4da8dce | 8982 | if (!prototype_p (TREE_TYPE (decl1))) |
6fb58bba | 8983 | { |
3fa8871b MP |
8984 | if (old_decl != NULL_TREE |
8985 | && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE | |
6fb58bba JM |
8986 | && comptypes (TREE_TYPE (TREE_TYPE (decl1)), |
8987 | TREE_TYPE (TREE_TYPE (old_decl)))) | |
8988 | { | |
e9122ef6 MP |
8989 | if (stdarg_p (TREE_TYPE (old_decl))) |
8990 | { | |
097f82ec | 8991 | auto_diagnostic_group d; |
e9122ef6 MP |
8992 | warning_at (loc, 0, "%q+D defined as variadic function " |
8993 | "without prototype", decl1); | |
8994 | locate_old_decl (old_decl); | |
8995 | } | |
6fb58bba JM |
8996 | TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl), |
8997 | TREE_TYPE (decl1)); | |
8998 | current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl); | |
8999 | current_function_prototype_built_in | |
9000 | = C_DECL_BUILTIN_PROTOTYPE (old_decl); | |
9001 | current_function_prototype_arg_types | |
9002 | = TYPE_ARG_TYPES (TREE_TYPE (decl1)); | |
9003 | } | |
9004 | if (TREE_PUBLIC (decl1)) | |
9005 | { | |
9006 | /* If there is an external prototype declaration of this | |
9007 | function, record its location but do not copy information | |
9008 | to this decl. This may be an invisible declaration | |
9009 | (built-in or in a scope which has finished) or simply | |
9010 | have more refined argument types than any declaration | |
9011 | found above. */ | |
9012 | struct c_binding *b; | |
9013 | for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed) | |
9014 | if (B_IN_SCOPE (b, external_scope)) | |
9015 | break; | |
9016 | if (b) | |
9017 | { | |
9018 | tree ext_decl, ext_type; | |
9019 | ext_decl = b->decl; | |
e1b7793c | 9020 | ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl); |
6fb58bba JM |
9021 | if (TREE_CODE (ext_type) == FUNCTION_TYPE |
9022 | && comptypes (TREE_TYPE (TREE_TYPE (decl1)), | |
9023 | TREE_TYPE (ext_type))) | |
9024 | { | |
9025 | current_function_prototype_locus | |
9026 | = DECL_SOURCE_LOCATION (ext_decl); | |
9027 | current_function_prototype_built_in | |
9028 | = C_DECL_BUILTIN_PROTOTYPE (ext_decl); | |
9029 | current_function_prototype_arg_types | |
9030 | = TYPE_ARG_TYPES (ext_type); | |
9031 | } | |
9032 | } | |
9033 | } | |
50a9145c | 9034 | } |
51e29401 RS |
9035 | |
9036 | /* Optionally warn of old-fashioned def with no previous prototype. */ | |
9037 | if (warn_strict_prototypes | |
1e55c0e2 | 9038 | && old_decl != error_mark_node |
f4da8dce | 9039 | && !prototype_p (TREE_TYPE (decl1)) |
339a28b9 | 9040 | && C_DECL_ISNT_PROTOTYPE (old_decl)) |
c2255bc4 AH |
9041 | warning_at (loc, OPT_Wstrict_prototypes, |
9042 | "function declaration isn%'t a prototype"); | |
51e29401 RS |
9043 | /* Optionally warn of any global def with no previous prototype. */ |
9044 | else if (warn_missing_prototypes | |
1e55c0e2 | 9045 | && old_decl != error_mark_node |
51e29401 | 9046 | && TREE_PUBLIC (decl1) |
3f75a254 | 9047 | && !MAIN_NAME_P (DECL_NAME (decl1)) |
edd28054 MP |
9048 | && C_DECL_ISNT_PROTOTYPE (old_decl) |
9049 | && !DECL_DECLARED_INLINE_P (decl1)) | |
c2255bc4 AH |
9050 | warning_at (loc, OPT_Wmissing_prototypes, |
9051 | "no previous prototype for %qD", decl1); | |
51e29401 RS |
9052 | /* Optionally warn of any def with no previous prototype |
9053 | if the function has already been used. */ | |
9054 | else if (warn_missing_prototypes | |
3fa8871b | 9055 | && old_decl != NULL_TREE |
1e55c0e2 JM |
9056 | && old_decl != error_mark_node |
9057 | && TREE_USED (old_decl) | |
f4da8dce | 9058 | && !prototype_p (TREE_TYPE (old_decl))) |
c2255bc4 AH |
9059 | warning_at (loc, OPT_Wmissing_prototypes, |
9060 | "%qD was used with no prototype before its definition", decl1); | |
1474fe46 RK |
9061 | /* Optionally warn of any global def with no previous declaration. */ |
9062 | else if (warn_missing_declarations | |
9063 | && TREE_PUBLIC (decl1) | |
3fa8871b | 9064 | && old_decl == NULL_TREE |
b286be94 MP |
9065 | && !MAIN_NAME_P (DECL_NAME (decl1)) |
9066 | && !DECL_DECLARED_INLINE_P (decl1)) | |
c2255bc4 AH |
9067 | warning_at (loc, OPT_Wmissing_declarations, |
9068 | "no previous declaration for %qD", | |
9069 | decl1); | |
1474fe46 RK |
9070 | /* Optionally warn of any def with no previous declaration |
9071 | if the function has already been used. */ | |
9072 | else if (warn_missing_declarations | |
3fa8871b | 9073 | && old_decl != NULL_TREE |
1e55c0e2 JM |
9074 | && old_decl != error_mark_node |
9075 | && TREE_USED (old_decl) | |
339a28b9 | 9076 | && C_DECL_IMPLICIT (old_decl)) |
c2255bc4 AH |
9077 | warning_at (loc, OPT_Wmissing_declarations, |
9078 | "%qD was used with no declaration before its definition", decl1); | |
51e29401 | 9079 | |
51e29401 RS |
9080 | /* This function exists in static storage. |
9081 | (This does not mean `static' in the C sense!) */ | |
9082 | TREE_STATIC (decl1) = 1; | |
9083 | ||
d05cc98e GK |
9084 | /* This is the earliest point at which we might know the assembler |
9085 | name of the function. Thus, if it's set before this, die horribly. */ | |
366de0ce | 9086 | gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1)); |
d05cc98e GK |
9087 | |
9088 | /* If #pragma weak was used, mark the decl weak now. */ | |
f75fbaf7 | 9089 | if (current_scope == file_scope) |
d05cc98e GK |
9090 | maybe_apply_pragma_weak (decl1); |
9091 | ||
6645c3fa | 9092 | /* Warn for unlikely, improbable, or stupid declarations of `main'. */ |
4003301d | 9093 | if (warn_main && MAIN_NAME_P (DECL_NAME (decl1))) |
b8705e61 | 9094 | { |
b8705e61 | 9095 | if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1))) |
6645c3fa | 9096 | != integer_type_node) |
c2255bc4 | 9097 | pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1); |
f827930a MP |
9098 | else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1)))) |
9099 | pedwarn (loc, OPT_Wmain, "%<_Atomic%>-qualified return type of %qD", | |
9100 | decl1); | |
b8705e61 | 9101 | |
4003301d | 9102 | check_main_parameter_types (decl1); |
b8705e61 | 9103 | |
3f75a254 | 9104 | if (!TREE_PUBLIC (decl1)) |
c2255bc4 AH |
9105 | pedwarn (loc, OPT_Wmain, |
9106 | "%qD is normally a non-static function", decl1); | |
b8705e61 RK |
9107 | } |
9108 | ||
51e29401 RS |
9109 | /* Record the decl so that the function name is defined. |
9110 | If we already have a decl for this name, and it is a FUNCTION_DECL, | |
9111 | use the old decl. */ | |
9112 | ||
9113 | current_function_decl = pushdecl (decl1); | |
9114 | ||
f75fbaf7 | 9115 | push_scope (); |
eb1dfbb2 | 9116 | declare_parm_level (); |
51e29401 | 9117 | |
51e29401 | 9118 | restype = TREE_TYPE (TREE_TYPE (current_function_decl)); |
c2255bc4 | 9119 | resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype); |
b785f485 RH |
9120 | DECL_ARTIFICIAL (resdecl) = 1; |
9121 | DECL_IGNORED_P (resdecl) = 1; | |
9122 | DECL_RESULT (current_function_decl) = resdecl; | |
51e29401 | 9123 | |
0ba8a114 | 9124 | start_fname_decls (); |
35b1a6fa | 9125 | |
e3455240 | 9126 | return true; |
51e29401 | 9127 | } |
51e29401 | 9128 | \f |
66db6b62 ZW |
9129 | /* Subroutine of store_parm_decls which handles new-style function |
9130 | definitions (prototype format). The parms already have decls, so we | |
9131 | need only record them as in effect and complain if any redundant | |
9132 | old-style parm decls were written. */ | |
d4e43dff | 9133 | static void |
f8893e47 | 9134 | store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info) |
51e29401 | 9135 | { |
f75fbaf7 | 9136 | tree decl; |
e60bf9d4 NF |
9137 | c_arg_tag *tag; |
9138 | unsigned ix; | |
51e29401 | 9139 | |
f75fbaf7 | 9140 | if (current_scope->bindings) |
66db6b62 | 9141 | { |
c5d75364 MLI |
9142 | error_at (DECL_SOURCE_LOCATION (fndecl), |
9143 | "old-style parameter declarations in prototyped " | |
9144 | "function definition"); | |
51e29401 | 9145 | |
66db6b62 | 9146 | /* Get rid of the old-style declarations. */ |
f75fbaf7 ZW |
9147 | pop_scope (); |
9148 | push_scope (); | |
9149 | } | |
9150 | /* Don't issue this warning for nested functions, and don't issue this | |
9151 | warning if we got here because ARG_INFO_TYPES was error_mark_node | |
9152 | (this happens when a function definition has just an ellipsis in | |
9153 | its parameter list). */ | |
8400e75e DM |
9154 | else if (!in_system_header_at (input_location) |
9155 | && !current_function_scope | |
f8893e47 | 9156 | && arg_info->types != error_mark_node) |
c5d75364 MLI |
9157 | warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional, |
9158 | "traditional C rejects ISO C style function definitions"); | |
51e29401 | 9159 | |
55d54003 ZW |
9160 | /* Now make all the parameter declarations visible in the function body. |
9161 | We can bypass most of the grunt work of pushdecl. */ | |
910ad8de | 9162 | for (decl = arg_info->parms; decl; decl = DECL_CHAIN (decl)) |
66db6b62 | 9163 | { |
55d54003 | 9164 | DECL_CONTEXT (decl) = current_function_decl; |
f75fbaf7 | 9165 | if (DECL_NAME (decl)) |
7c47d6e9 JM |
9166 | { |
9167 | bind (DECL_NAME (decl), decl, current_scope, | |
b3f27c15 JJ |
9168 | /*invisible=*/false, /*nested=*/false, |
9169 | UNKNOWN_LOCATION); | |
7c47d6e9 JM |
9170 | if (!TREE_USED (decl)) |
9171 | warn_if_shadowing (decl); | |
9172 | } | |
66db6b62 | 9173 | else |
c5d75364 | 9174 | error_at (DECL_SOURCE_LOCATION (decl), "parameter name omitted"); |
66db6b62 | 9175 | } |
26f943fd | 9176 | |
66db6b62 | 9177 | /* Record the parameter list in the function declaration. */ |
f8893e47 | 9178 | DECL_ARGUMENTS (fndecl) = arg_info->parms; |
51e29401 | 9179 | |
66db6b62 | 9180 | /* Now make all the ancillary declarations visible, likewise. */ |
910ad8de | 9181 | for (decl = arg_info->others; decl; decl = DECL_CHAIN (decl)) |
55d54003 ZW |
9182 | { |
9183 | DECL_CONTEXT (decl) = current_function_decl; | |
f75fbaf7 | 9184 | if (DECL_NAME (decl)) |
9aaabf8a | 9185 | bind (DECL_NAME (decl), decl, current_scope, |
10e76c1a JM |
9186 | /*invisible=*/false, |
9187 | /*nested=*/(TREE_CODE (decl) == FUNCTION_DECL), | |
9188 | UNKNOWN_LOCATION); | |
55d54003 | 9189 | } |
26f943fd | 9190 | |
66db6b62 | 9191 | /* And all the tag declarations. */ |
9771b263 | 9192 | FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag) |
e60bf9d4 NF |
9193 | if (tag->id) |
9194 | bind (tag->id, tag->type, current_scope, | |
b3f27c15 | 9195 | /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION); |
66db6b62 | 9196 | } |
1f731749 | 9197 | |
66db6b62 ZW |
9198 | /* Subroutine of store_parm_decls which handles old-style function |
9199 | definitions (separate parameter list and declarations). */ | |
51e29401 | 9200 | |
66db6b62 | 9201 | static void |
f8893e47 | 9202 | store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info) |
66db6b62 | 9203 | { |
f75fbaf7 | 9204 | struct c_binding *b; |
55d54003 | 9205 | tree parm, decl, last; |
f8893e47 | 9206 | tree parmids = arg_info->parms; |
6e2830c3 | 9207 | hash_set<tree> seen_args; |
66db6b62 | 9208 | |
8400e75e | 9209 | if (!in_system_header_at (input_location)) |
c2255bc4 AH |
9210 | warning_at (DECL_SOURCE_LOCATION (fndecl), |
9211 | OPT_Wold_style_definition, "old-style function definition"); | |
f75fbaf7 | 9212 | |
66db6b62 ZW |
9213 | /* Match each formal parameter name with its declaration. Save each |
9214 | decl in the appropriate TREE_PURPOSE slot of the parmids chain. */ | |
9215 | for (parm = parmids; parm; parm = TREE_CHAIN (parm)) | |
9216 | { | |
3fa8871b | 9217 | if (TREE_VALUE (parm) == NULL_TREE) |
7a0347ff | 9218 | { |
c2255bc4 AH |
9219 | error_at (DECL_SOURCE_LOCATION (fndecl), |
9220 | "parameter name missing from parameter list"); | |
3fa8871b | 9221 | TREE_PURPOSE (parm) = NULL_TREE; |
66db6b62 | 9222 | continue; |
7a0347ff | 9223 | } |
51e29401 | 9224 | |
f75fbaf7 | 9225 | b = I_SYMBOL_BINDING (TREE_VALUE (parm)); |
9aaabf8a | 9226 | if (b && B_IN_CURRENT_SCOPE (b)) |
51e29401 | 9227 | { |
f75fbaf7 | 9228 | decl = b->decl; |
c58e98c8 SM |
9229 | /* Skip erroneous parameters. */ |
9230 | if (decl == error_mark_node) | |
9231 | continue; | |
66db6b62 ZW |
9232 | /* If we got something other than a PARM_DECL it is an error. */ |
9233 | if (TREE_CODE (decl) != PARM_DECL) | |
a23faf7a MP |
9234 | { |
9235 | error_at (DECL_SOURCE_LOCATION (decl), | |
9236 | "%qD declared as a non-parameter", decl); | |
9237 | continue; | |
9238 | } | |
66db6b62 ZW |
9239 | /* If the declaration is already marked, we have a duplicate |
9240 | name. Complain and ignore the duplicate. */ | |
6e2830c3 | 9241 | else if (seen_args.contains (decl)) |
51e29401 | 9242 | { |
c2255bc4 AH |
9243 | error_at (DECL_SOURCE_LOCATION (decl), |
9244 | "multiple parameters named %qD", decl); | |
3fa8871b | 9245 | TREE_PURPOSE (parm) = NULL_TREE; |
66db6b62 | 9246 | continue; |
51e29401 | 9247 | } |
66db6b62 ZW |
9248 | /* If the declaration says "void", complain and turn it into |
9249 | an int. */ | |
9250 | else if (VOID_TYPE_P (TREE_TYPE (decl))) | |
51e29401 | 9251 | { |
c2255bc4 AH |
9252 | error_at (DECL_SOURCE_LOCATION (decl), |
9253 | "parameter %qD declared with void type", decl); | |
66db6b62 ZW |
9254 | TREE_TYPE (decl) = integer_type_node; |
9255 | DECL_ARG_TYPE (decl) = integer_type_node; | |
9256 | layout_decl (decl, 0); | |
51e29401 | 9257 | } |
7c47d6e9 | 9258 | warn_if_shadowing (decl); |
51e29401 | 9259 | } |
66db6b62 ZW |
9260 | /* If no declaration found, default to int. */ |
9261 | else | |
51e29401 | 9262 | { |
c2255bc4 AH |
9263 | /* FIXME diagnostics: This should be the location of the argument, |
9264 | not the FNDECL. E.g., for an old-style declaration | |
9265 | ||
9266 | int f10(v) { blah; } | |
9267 | ||
9268 | We should use the location of the V, not the F10. | |
9269 | Unfortunately, the V is an IDENTIFIER_NODE which has no | |
9270 | location. In the future we need locations for c_arg_info | |
9271 | entries. | |
9272 | ||
9273 | See gcc.dg/Wshadow-3.c for an example of this problem. */ | |
9274 | decl = build_decl (DECL_SOURCE_LOCATION (fndecl), | |
9275 | PARM_DECL, TREE_VALUE (parm), integer_type_node); | |
66db6b62 | 9276 | DECL_ARG_TYPE (decl) = TREE_TYPE (decl); |
66db6b62 | 9277 | pushdecl (decl); |
7c47d6e9 | 9278 | warn_if_shadowing (decl); |
66db6b62 ZW |
9279 | |
9280 | if (flag_isoc99) | |
c2255bc4 | 9281 | pedwarn (DECL_SOURCE_LOCATION (decl), |
92574c7c MP |
9282 | OPT_Wimplicit_int, "type of %qD defaults to %<int%>", |
9283 | decl); | |
b8698a0f | 9284 | else |
c2255bc4 AH |
9285 | warning_at (DECL_SOURCE_LOCATION (decl), |
9286 | OPT_Wmissing_parameter_type, | |
9287 | "type of %qD defaults to %<int%>", decl); | |
51e29401 RS |
9288 | } |
9289 | ||
66db6b62 | 9290 | TREE_PURPOSE (parm) = decl; |
6e2830c3 | 9291 | seen_args.add (decl); |
51e29401 | 9292 | } |
51e29401 | 9293 | |
55d54003 ZW |
9294 | /* Now examine the parms chain for incomplete declarations |
9295 | and declarations with no corresponding names. */ | |
51e29401 | 9296 | |
f75fbaf7 | 9297 | for (b = current_scope->bindings; b; b = b->prev) |
66db6b62 | 9298 | { |
f75fbaf7 ZW |
9299 | parm = b->decl; |
9300 | if (TREE_CODE (parm) != PARM_DECL) | |
9301 | continue; | |
9302 | ||
559f2da5 RH |
9303 | if (TREE_TYPE (parm) != error_mark_node |
9304 | && !COMPLETE_TYPE_P (TREE_TYPE (parm))) | |
51e29401 | 9305 | { |
c2255bc4 AH |
9306 | error_at (DECL_SOURCE_LOCATION (parm), |
9307 | "parameter %qD has incomplete type", parm); | |
66db6b62 ZW |
9308 | TREE_TYPE (parm) = error_mark_node; |
9309 | } | |
51e29401 | 9310 | |
6e2830c3 | 9311 | if (!seen_args.contains (parm)) |
66db6b62 | 9312 | { |
c2255bc4 AH |
9313 | error_at (DECL_SOURCE_LOCATION (parm), |
9314 | "declaration for parameter %qD but no such parameter", | |
9315 | parm); | |
51e29401 | 9316 | |
66db6b62 ZW |
9317 | /* Pretend the parameter was not missing. |
9318 | This gets us to a standard state and minimizes | |
9319 | further error messages. */ | |
9320 | parmids = chainon (parmids, tree_cons (parm, 0, 0)); | |
51e29401 | 9321 | } |
66db6b62 | 9322 | } |
51e29401 | 9323 | |
66db6b62 ZW |
9324 | /* Chain the declarations together in the order of the list of |
9325 | names. Store that chain in the function decl, replacing the | |
55d54003 | 9326 | list of names. Update the current scope to match. */ |
3fa8871b | 9327 | DECL_ARGUMENTS (fndecl) = NULL_TREE; |
66db6b62 | 9328 | |
55d54003 ZW |
9329 | for (parm = parmids; parm; parm = TREE_CHAIN (parm)) |
9330 | if (TREE_PURPOSE (parm)) | |
9331 | break; | |
9332 | if (parm && TREE_PURPOSE (parm)) | |
9333 | { | |
9334 | last = TREE_PURPOSE (parm); | |
9335 | DECL_ARGUMENTS (fndecl) = last; | |
55d54003 ZW |
9336 | |
9337 | for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm)) | |
9338 | if (TREE_PURPOSE (parm)) | |
9339 | { | |
910ad8de | 9340 | DECL_CHAIN (last) = TREE_PURPOSE (parm); |
55d54003 | 9341 | last = TREE_PURPOSE (parm); |
55d54003 | 9342 | } |
3fa8871b | 9343 | DECL_CHAIN (last) = NULL_TREE; |
55d54003 | 9344 | } |
51e29401 | 9345 | |
66db6b62 ZW |
9346 | /* If there was a previous prototype, |
9347 | set the DECL_ARG_TYPE of each argument according to | |
9348 | the type previously specified, and report any mismatches. */ | |
51e29401 | 9349 | |
6fb58bba | 9350 | if (current_function_prototype_arg_types) |
66db6b62 ZW |
9351 | { |
9352 | tree type; | |
9353 | for (parm = DECL_ARGUMENTS (fndecl), | |
6fb58bba | 9354 | type = current_function_prototype_arg_types; |
7f5a7d78 MP |
9355 | parm || (type != NULL_TREE |
9356 | && TREE_VALUE (type) != error_mark_node | |
9357 | && TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node); | |
910ad8de | 9358 | parm = DECL_CHAIN (parm), type = TREE_CHAIN (type)) |
51e29401 | 9359 | { |
7f5a7d78 MP |
9360 | if (parm == NULL_TREE |
9361 | || type == NULL_TREE | |
9362 | || (TREE_VALUE (type) != error_mark_node | |
9363 | && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)) | |
51e29401 | 9364 | { |
6fb58bba | 9365 | if (current_function_prototype_built_in) |
c2255bc4 AH |
9366 | warning_at (DECL_SOURCE_LOCATION (fndecl), |
9367 | 0, "number of arguments doesn%'t match " | |
9368 | "built-in prototype"); | |
6fb58bba JM |
9369 | else |
9370 | { | |
c2255bc4 AH |
9371 | /* FIXME diagnostics: This should be the location of |
9372 | FNDECL, but there is bug when a prototype is | |
9373 | declared inside function context, but defined | |
9374 | outside of it (e.g., gcc.dg/pr15698-2.c). In | |
9375 | which case FNDECL gets the location of the | |
9376 | prototype, not the definition. */ | |
9377 | error_at (input_location, | |
9378 | "number of arguments doesn%'t match prototype"); | |
9379 | ||
9380 | error_at (current_function_prototype_locus, | |
9381 | "prototype declaration"); | |
6fb58bba | 9382 | } |
66db6b62 ZW |
9383 | break; |
9384 | } | |
9385 | /* Type for passing arg must be consistent with that | |
9386 | declared for the arg. ISO C says we take the unqualified | |
9387 | type for parameters declared with qualified type. */ | |
bb686a19 | 9388 | if (TREE_TYPE (parm) != error_mark_node |
7f5a7d78 | 9389 | && TREE_VALUE (type) != error_mark_node |
267bac10 JM |
9390 | && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm)) |
9391 | != TYPE_ATOMIC (TREE_VALUE (type))) | |
9392 | || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)), | |
9393 | TYPE_MAIN_VARIANT (TREE_VALUE (type))))) | |
66db6b62 | 9394 | { |
267bac10 JM |
9395 | if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm)) |
9396 | == TYPE_ATOMIC (TREE_VALUE (type))) | |
9397 | && (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) | |
9398 | == TYPE_MAIN_VARIANT (TREE_VALUE (type)))) | |
51e29401 | 9399 | { |
66db6b62 ZW |
9400 | /* Adjust argument to match prototype. E.g. a previous |
9401 | `int foo(float);' prototype causes | |
9402 | `int foo(x) float x; {...}' to be treated like | |
9403 | `int foo(float x) {...}'. This is particularly | |
9404 | useful for argument types like uid_t. */ | |
9405 | DECL_ARG_TYPE (parm) = TREE_TYPE (parm); | |
9406 | ||
61f71b34 | 9407 | if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl)) |
66db6b62 | 9408 | && INTEGRAL_TYPE_P (TREE_TYPE (parm)) |
7f5a7d78 MP |
9409 | && (TYPE_PRECISION (TREE_TYPE (parm)) |
9410 | < TYPE_PRECISION (integer_type_node))) | |
267bac10 JM |
9411 | DECL_ARG_TYPE (parm) |
9412 | = c_type_promotes_to (TREE_TYPE (parm)); | |
66db6b62 | 9413 | |
fcf73884 MLI |
9414 | /* ??? Is it possible to get here with a |
9415 | built-in prototype or will it always have | |
9416 | been diagnosed as conflicting with an | |
9417 | old-style definition and discarded? */ | |
9418 | if (current_function_prototype_built_in) | |
c2255bc4 | 9419 | warning_at (DECL_SOURCE_LOCATION (parm), |
c1771a20 | 9420 | OPT_Wpedantic, "promoted argument %qD " |
c2255bc4 | 9421 | "doesn%'t match built-in prototype", parm); |
fcf73884 | 9422 | else |
50a9145c | 9423 | { |
c2255bc4 | 9424 | pedwarn (DECL_SOURCE_LOCATION (parm), |
c1771a20 | 9425 | OPT_Wpedantic, "promoted argument %qD " |
fcf73884 | 9426 | "doesn%'t match prototype", parm); |
c1771a20 | 9427 | pedwarn (current_function_prototype_locus, OPT_Wpedantic, |
509c9d60 | 9428 | "prototype declaration"); |
50a9145c | 9429 | } |
51e29401 | 9430 | } |
66db6b62 ZW |
9431 | else |
9432 | { | |
6fb58bba | 9433 | if (current_function_prototype_built_in) |
c2255bc4 AH |
9434 | warning_at (DECL_SOURCE_LOCATION (parm), |
9435 | 0, "argument %qD doesn%'t match " | |
9436 | "built-in prototype", parm); | |
6fb58bba JM |
9437 | else |
9438 | { | |
c2255bc4 AH |
9439 | error_at (DECL_SOURCE_LOCATION (parm), |
9440 | "argument %qD doesn%'t match prototype", parm); | |
9441 | error_at (current_function_prototype_locus, | |
9442 | "prototype declaration"); | |
6fb58bba | 9443 | } |
66db6b62 | 9444 | } |
51e29401 | 9445 | } |
51e29401 | 9446 | } |
3fa8871b | 9447 | TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = NULL_TREE; |
66db6b62 | 9448 | } |
51e29401 | 9449 | |
66db6b62 | 9450 | /* Otherwise, create a prototype that would match. */ |
51e29401 | 9451 | |
66db6b62 ZW |
9452 | else |
9453 | { | |
3fa8871b | 9454 | tree actual = NULL_TREE, last = NULL_TREE, type; |
51e29401 | 9455 | |
910ad8de | 9456 | for (parm = DECL_ARGUMENTS (fndecl); parm; parm = DECL_CHAIN (parm)) |
66db6b62 ZW |
9457 | { |
9458 | type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE); | |
51e29401 RS |
9459 | if (last) |
9460 | TREE_CHAIN (last) = type; | |
9461 | else | |
9462 | actual = type; | |
66db6b62 ZW |
9463 | last = type; |
9464 | } | |
9465 | type = tree_cons (NULL_TREE, void_type_node, NULL_TREE); | |
9466 | if (last) | |
9467 | TREE_CHAIN (last) = type; | |
9468 | else | |
9469 | actual = type; | |
51e29401 | 9470 | |
66db6b62 ZW |
9471 | /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES |
9472 | of the type of this function, but we need to avoid having this | |
9473 | affect the types of other similarly-typed functions, so we must | |
9474 | first force the generation of an identical (but separate) type | |
9475 | node for the relevant function type. The new node we create | |
9476 | will be a variant of the main variant of the original function | |
9477 | type. */ | |
c138f328 | 9478 | |
8dd16ecc | 9479 | TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl)); |
c138f328 | 9480 | |
66db6b62 ZW |
9481 | TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual; |
9482 | } | |
66db6b62 ZW |
9483 | } |
9484 | ||
d4e43dff ZL |
9485 | /* Store parameter declarations passed in ARG_INFO into the current |
9486 | function declaration. */ | |
9487 | ||
9488 | void | |
f8893e47 | 9489 | store_parm_decls_from (struct c_arg_info *arg_info) |
d4e43dff ZL |
9490 | { |
9491 | current_function_arg_info = arg_info; | |
9492 | store_parm_decls (); | |
9493 | } | |
9494 | ||
5c4abbb8 MP |
9495 | /* Called by walk_tree to look for and update context-less labels. */ |
9496 | ||
9497 | static tree | |
9498 | set_labels_context_r (tree *tp, int *walk_subtrees, void *data) | |
9499 | { | |
9500 | if (TREE_CODE (*tp) == LABEL_EXPR | |
9501 | && DECL_CONTEXT (LABEL_EXPR_LABEL (*tp)) == NULL_TREE) | |
9502 | { | |
9503 | DECL_CONTEXT (LABEL_EXPR_LABEL (*tp)) = static_cast<tree>(data); | |
9504 | *walk_subtrees = 0; | |
9505 | } | |
9506 | ||
9507 | return NULL_TREE; | |
9508 | } | |
9509 | ||
66db6b62 ZW |
9510 | /* Store the parameter declarations into the current function declaration. |
9511 | This is called after parsing the parameter declarations, before | |
9512 | digesting the body of the function. | |
9513 | ||
9514 | For an old-style definition, construct a prototype out of the old-style | |
9515 | parameter declarations and inject it into the function's type. */ | |
9516 | ||
9517 | void | |
9518 | store_parm_decls (void) | |
9519 | { | |
9520 | tree fndecl = current_function_decl; | |
7b112487 | 9521 | bool proto; |
66db6b62 | 9522 | |
77dbdb57 | 9523 | /* The argument information block for FNDECL. */ |
f8893e47 | 9524 | struct c_arg_info *arg_info = current_function_arg_info; |
7b112487 | 9525 | current_function_arg_info = 0; |
77dbdb57 | 9526 | |
f75fbaf7 ZW |
9527 | /* True if this definition is written with a prototype. Note: |
9528 | despite C99 6.7.5.3p14, we can *not* treat an empty argument | |
9529 | list in a function definition as equivalent to (void) -- an | |
9530 | empty argument list specifies the function has no parameters, | |
9531 | but only (void) sets up a prototype for future calls. */ | |
f8893e47 | 9532 | proto = arg_info->types != 0; |
66db6b62 | 9533 | |
f75fbaf7 | 9534 | if (proto) |
77dbdb57 | 9535 | store_parm_decls_newstyle (fndecl, arg_info); |
66db6b62 | 9536 | else |
77dbdb57 | 9537 | store_parm_decls_oldstyle (fndecl, arg_info); |
51e29401 | 9538 | |
f75fbaf7 | 9539 | /* The next call to push_scope will be a function body. */ |
51e29401 | 9540 | |
a8ccdffe | 9541 | next_is_function_body = true; |
51e29401 | 9542 | |
51e29401 RS |
9543 | /* Write a record describing this function definition to the prototypes |
9544 | file (if requested). */ | |
9545 | ||
f75fbaf7 | 9546 | gen_aux_info_record (fndecl, 1, 0, proto); |
51e29401 RS |
9547 | |
9548 | /* Initialize the RTL code for the function. */ | |
182e0d71 | 9549 | allocate_struct_function (fndecl, false); |
51e29401 | 9550 | |
3797cb21 | 9551 | if (warn_unused_local_typedefs) |
766090c2 | 9552 | cfun->language = ggc_cleared_alloc<language_function> (); |
3797cb21 | 9553 | |
8f17b5c5 | 9554 | /* Begin the statement tree for this function. */ |
325c3691 | 9555 | DECL_SAVED_TREE (fndecl) = push_stmt_list (); |
51e29401 | 9556 | |
82c82743 | 9557 | /* ??? Insert the contents of the pending sizes list into the function |
4744afba RH |
9558 | to be evaluated. The only reason left to have this is |
9559 | void foo(int n, int array[n++]) | |
9560 | because we throw away the array type in favor of a pointer type, and | |
9561 | thus won't naturally see the SAVE_EXPR containing the increment. All | |
9562 | other pending sizes would be handled by gimplify_parameters. */ | |
a04a722b | 9563 | if (arg_info->pending_sizes) |
5c4abbb8 MP |
9564 | { |
9565 | /* In very special circumstances, e.g. for code like | |
9566 | _Atomic int i = 5; | |
9567 | void f (int a[i += 2]) {} | |
9568 | we need to execute the atomic assignment on function entry. | |
9569 | But in this case, it is not just a straight store, it has the | |
9570 | op= form, which means that build_atomic_assign has generated | |
9571 | gotos, labels, etc. Because at that time the function decl | |
9572 | for F has not been created yet, those labels do not have any | |
9573 | function context. But we have the fndecl now, so update the | |
9574 | labels accordingly. gimplify_expr would crash otherwise. */ | |
9575 | walk_tree_without_duplicates (&arg_info->pending_sizes, | |
9576 | set_labels_context_r, fndecl); | |
9577 | add_stmt (arg_info->pending_sizes); | |
9578 | } | |
51e29401 | 9579 | } |
acf0174b JJ |
9580 | |
9581 | /* Store PARM_DECLs in PARMS into scope temporarily. Used for | |
9582 | c_finish_omp_declare_simd for function prototypes. No diagnostics | |
9583 | should be done. */ | |
9584 | ||
9585 | void | |
9586 | temp_store_parm_decls (tree fndecl, tree parms) | |
9587 | { | |
9588 | push_scope (); | |
9589 | for (tree p = parms; p; p = DECL_CHAIN (p)) | |
9590 | { | |
9591 | DECL_CONTEXT (p) = fndecl; | |
9592 | if (DECL_NAME (p)) | |
9593 | bind (DECL_NAME (p), p, current_scope, | |
9594 | /*invisible=*/false, /*nested=*/false, | |
9595 | UNKNOWN_LOCATION); | |
9596 | } | |
9597 | } | |
9598 | ||
9599 | /* Undo what temp_store_parm_decls did. */ | |
9600 | ||
9601 | void | |
9602 | temp_pop_parm_decls (void) | |
9603 | { | |
9604 | /* Clear all bindings in this temporary scope, so that | |
9605 | pop_scope doesn't create a BLOCK. */ | |
9606 | struct c_binding *b = current_scope->bindings; | |
9607 | current_scope->bindings = NULL; | |
9608 | for (; b; b = free_binding_and_advance (b)) | |
9609 | { | |
fce5e5e3 JJ |
9610 | gcc_assert (TREE_CODE (b->decl) == PARM_DECL |
9611 | || b->decl == error_mark_node); | |
acf0174b JJ |
9612 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); |
9613 | I_SYMBOL_BINDING (b->id) = b->shadowed; | |
9614 | if (b->shadowed && b->shadowed->u.type) | |
9615 | TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type; | |
9616 | } | |
9617 | pop_scope (); | |
9618 | } | |
51e29401 | 9619 | \f |
6de9cd9a | 9620 | |
51e29401 | 9621 | /* Finish up a function declaration and compile that function |
cc343f65 | 9622 | all the way to assembler language output. Then free the storage |
51e29401 RS |
9623 | for the function definition. |
9624 | ||
4a46cbfb | 9625 | This is called after parsing the body of the function definition. */ |
51e29401 RS |
9626 | |
9627 | void | |
edaf3e03 | 9628 | finish_function (void) |
51e29401 | 9629 | { |
b3694847 | 9630 | tree fndecl = current_function_decl; |
6c39e757 NP |
9631 | |
9632 | if (c_dialect_objc ()) | |
9633 | objc_finish_function (); | |
51e29401 | 9634 | |
61f71b34 DD |
9635 | if (TREE_CODE (fndecl) == FUNCTION_DECL |
9636 | && targetm.calls.promote_prototypes (TREE_TYPE (fndecl))) | |
9637 | { | |
9638 | tree args = DECL_ARGUMENTS (fndecl); | |
910ad8de | 9639 | for (; args; args = DECL_CHAIN (args)) |
c22cacf3 MS |
9640 | { |
9641 | tree type = TREE_TYPE (args); | |
9642 | if (INTEGRAL_TYPE_P (type) | |
9643 | && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) | |
267bac10 | 9644 | DECL_ARG_TYPE (args) = c_type_promotes_to (type); |
c22cacf3 | 9645 | } |
61f71b34 DD |
9646 | } |
9647 | ||
67b28863 | 9648 | if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node) |
af3fbed1 | 9649 | BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl; |
51e29401 RS |
9650 | |
9651 | /* Must mark the RESULT_DECL as being in this function. */ | |
9652 | ||
67b28863 | 9653 | if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node) |
af3fbed1 | 9654 | DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl; |
51e29401 | 9655 | |
4003301d MLI |
9656 | if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted |
9657 | && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) | |
9658 | == integer_type_node && flag_isoc99) | |
9659 | { | |
4003301d MLI |
9660 | /* Hack. We don't want the middle-end to warn that this return |
9661 | is unreachable, so we mark its location as special. Using | |
9662 | UNKNOWN_LOCATION has the problem that it gets clobbered in | |
9663 | annotate_one_with_locus. A cleaner solution might be to | |
9664 | ensure ! should_carry_locus_p (stmt), but that needs a flag. | |
9665 | */ | |
c2255bc4 | 9666 | c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE); |
51e29401 | 9667 | } |
35b1a6fa | 9668 | |
8f17b5c5 | 9669 | /* Tie off the statement tree for this function. */ |
325c3691 RH |
9670 | DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl)); |
9671 | ||
9672 | finish_fname_decls (); | |
5ce89b2e | 9673 | |
b67b9225 DP |
9674 | /* Complain if there's no return statement only if option specified on |
9675 | command line. */ | |
9676 | if (warn_return_type > 0 | |
46cfb101 | 9677 | && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE |
5ce89b2e | 9678 | && !current_function_returns_value && !current_function_returns_null |
41806d92 | 9679 | /* Don't complain if we are no-return. */ |
5ce89b2e | 9680 | && !current_function_returns_abnormally |
ef5d1181 JJ |
9681 | /* Don't complain if we are declared noreturn. */ |
9682 | && !TREE_THIS_VOLATILE (fndecl) | |
5ce89b2e JM |
9683 | /* Don't warn for main(). */ |
9684 | && !MAIN_NAME_P (DECL_NAME (fndecl)) | |
9685 | /* Or if they didn't actually specify a return type. */ | |
9686 | && !C_FUNCTION_IMPLICIT_INT (fndecl) | |
7e8b322a JH |
9687 | /* Normally, with -Wreturn-type, flow will complain, but we might |
9688 | optimize out static functions. */ | |
1db01ff9 JJ |
9689 | && !TREE_PUBLIC (fndecl) |
9690 | && warning (OPT_Wreturn_type, | |
9691 | "no return statement in function returning non-void")) | |
9692 | TREE_NO_WARNING (fndecl) = 1; | |
5ce89b2e | 9693 | |
ebfbbdc5 JJ |
9694 | /* Complain about parameters that are only set, but never otherwise used. */ |
9695 | if (warn_unused_but_set_parameter) | |
9696 | { | |
9697 | tree decl; | |
9698 | ||
9699 | for (decl = DECL_ARGUMENTS (fndecl); | |
9700 | decl; | |
910ad8de | 9701 | decl = DECL_CHAIN (decl)) |
ebfbbdc5 JJ |
9702 | if (TREE_USED (decl) |
9703 | && TREE_CODE (decl) == PARM_DECL | |
9704 | && !DECL_READ_P (decl) | |
9705 | && DECL_NAME (decl) | |
9706 | && !DECL_ARTIFICIAL (decl) | |
9707 | && !TREE_NO_WARNING (decl)) | |
9708 | warning_at (DECL_SOURCE_LOCATION (decl), | |
9709 | OPT_Wunused_but_set_parameter, | |
9710 | "parameter %qD set but not used", decl); | |
9711 | } | |
9712 | ||
3797cb21 DS |
9713 | /* Complain about locally defined typedefs that are not used in this |
9714 | function. */ | |
9715 | maybe_warn_unused_local_typedefs (); | |
9716 | ||
da2e71c9 MLI |
9717 | /* Possibly warn about unused parameters. */ |
9718 | if (warn_unused_parameter) | |
9719 | do_warn_unused_parameter (fndecl); | |
9720 | ||
6de9cd9a DN |
9721 | /* Store the end of the function, so that we get good line number |
9722 | info for the epilogue. */ | |
9723 | cfun->function_end_locus = input_location; | |
9724 | ||
b2ca3702 MM |
9725 | /* Finalize the ELF visibility for the function. */ |
9726 | c_determine_visibility (fndecl); | |
9727 | ||
c536a6a7 | 9728 | /* For GNU C extern inline functions disregard inline limits. */ |
b8698a0f | 9729 | if (DECL_EXTERNAL (fndecl) |
673a107a JJ |
9730 | && DECL_DECLARED_INLINE_P (fndecl) |
9731 | && (flag_gnu89_inline | |
9732 | || lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (fndecl)))) | |
c536a6a7 RG |
9733 | DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1; |
9734 | ||
6de9cd9a DN |
9735 | /* Genericize before inlining. Delay genericizing nested functions |
9736 | until their parent function is genericized. Since finalizing | |
9737 | requires GENERIC, delay that as well. */ | |
118a3a8b | 9738 | |
73aea290 JM |
9739 | if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node |
9740 | && !undef_nested_function) | |
6de9cd9a DN |
9741 | { |
9742 | if (!decl_function_context (fndecl)) | |
c22cacf3 | 9743 | { |
1c701f96 | 9744 | invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl); |
c22cacf3 | 9745 | c_genericize (fndecl); |
1a94c545 JH |
9746 | |
9747 | /* ??? Objc emits functions after finalizing the compilation unit. | |
9748 | This should be cleaned up later and this conditional removed. */ | |
3dafb85c | 9749 | if (symtab->global_info_ready) |
1a94c545 | 9750 | { |
d52f5295 | 9751 | cgraph_node::add_new_function (fndecl, false); |
1a94c545 JH |
9752 | return; |
9753 | } | |
3dafb85c | 9754 | cgraph_node::finalize_function (fndecl, false); |
c22cacf3 | 9755 | } |
6de9cd9a | 9756 | else |
c22cacf3 MS |
9757 | { |
9758 | /* Register this function with cgraph just far enough to get it | |
9759 | added to our parent's nested function list. Handy, since the | |
9760 | C front end doesn't have such a list. */ | |
d52f5295 | 9761 | (void) cgraph_node::get_create (fndecl); |
c22cacf3 | 9762 | } |
6de9cd9a DN |
9763 | } |
9764 | ||
73aea290 JM |
9765 | if (!decl_function_context (fndecl)) |
9766 | undef_nested_function = false; | |
9767 | ||
3797cb21 DS |
9768 | if (cfun->language != NULL) |
9769 | { | |
9770 | ggc_free (cfun->language); | |
9771 | cfun->language = NULL; | |
9772 | } | |
9773 | ||
1da326c3 | 9774 | /* We're leaving the context of this function, so zap cfun. |
6de9cd9a | 9775 | It's still in DECL_STRUCT_FUNCTION, and we'll restore it in |
1da326c3 | 9776 | tree_rest_of_compilation. */ |
db2960f4 | 9777 | set_cfun (NULL); |
ea5b45b6 | 9778 | invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION, current_function_decl); |
4a46cbfb | 9779 | current_function_decl = NULL; |
8f17b5c5 | 9780 | } |
51e29401 | 9781 | \f |
77c4d6c0 | 9782 | /* Check the declarations given in a for-loop for satisfying the C99 |
c2255bc4 | 9783 | constraints. If exactly one such decl is found, return it. LOC is |
f05b9d93 NP |
9784 | the location of the opening parenthesis of the for loop. The last |
9785 | parameter allows you to control the "for loop initial declarations | |
9786 | are only allowed in C99 mode". Normally, you should pass | |
9787 | flag_isoc99 as that parameter. But in some cases (Objective-C | |
9788 | foreach loop, for example) we want to run the checks in this | |
9789 | function even if not in C99 mode, so we allow the caller to turn | |
9790 | off the error about not being in C99 mode. | |
9791 | */ | |
953ff289 DN |
9792 | |
9793 | tree | |
f05b9d93 | 9794 | check_for_loop_decls (location_t loc, bool turn_off_iso_c99_error) |
77c4d6c0 | 9795 | { |
f75fbaf7 | 9796 | struct c_binding *b; |
953ff289 DN |
9797 | tree one_decl = NULL_TREE; |
9798 | int n_decls = 0; | |
9799 | ||
f05b9d93 | 9800 | if (!turn_off_iso_c99_error) |
77c4d6c0 | 9801 | { |
e9527cfd | 9802 | static bool hint = true; |
77c4d6c0 JM |
9803 | /* If we get here, declarations have been used in a for loop without |
9804 | the C99 for loop scope. This doesn't make much sense, so don't | |
9805 | allow it. */ | |
c2255bc4 | 9806 | error_at (loc, "%<for%> loop initial declarations " |
92f20202 | 9807 | "are only allowed in C99 or C11 mode"); |
e9527cfd MLI |
9808 | if (hint) |
9809 | { | |
c2255bc4 | 9810 | inform (loc, |
a3f9f006 ML |
9811 | "use option %<-std=c99%>, %<-std=gnu99%>, %<-std=c11%> or " |
9812 | "%<-std=gnu11%> to compile your code"); | |
e9527cfd MLI |
9813 | hint = false; |
9814 | } | |
953ff289 | 9815 | return NULL_TREE; |
77c4d6c0 | 9816 | } |
e4d44a37 MP |
9817 | else |
9818 | pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not support %<for%> loop " | |
9819 | "initial declarations"); | |
9820 | ||
77c4d6c0 JM |
9821 | /* C99 subclause 6.8.5 paragraph 3: |
9822 | ||
9823 | [#3] The declaration part of a for statement shall only | |
9824 | declare identifiers for objects having storage class auto or | |
9825 | register. | |
9826 | ||
9827 | It isn't clear whether, in this sentence, "identifiers" binds to | |
9828 | "shall only declare" or to "objects" - that is, whether all identifiers | |
9829 | declared must be identifiers for objects, or whether the restriction | |
9830 | only applies to those that are. (A question on this in comp.std.c | |
9831 | in November 2000 received no answer.) We implement the strictest | |
9832 | interpretation, to avoid creating an extension which later causes | |
9833 | problems. */ | |
9834 | ||
f75fbaf7 | 9835 | for (b = current_scope->bindings; b; b = b->prev) |
77c4d6c0 | 9836 | { |
f75fbaf7 ZW |
9837 | tree id = b->id; |
9838 | tree decl = b->decl; | |
53fcdc76 | 9839 | |
f75fbaf7 ZW |
9840 | if (!id) |
9841 | continue; | |
9842 | ||
9843 | switch (TREE_CODE (decl)) | |
9844 | { | |
9845 | case VAR_DECL: | |
c2255bc4 AH |
9846 | { |
9847 | location_t decl_loc = DECL_SOURCE_LOCATION (decl); | |
9848 | if (TREE_STATIC (decl)) | |
9849 | error_at (decl_loc, | |
9850 | "declaration of static variable %qD in %<for%> loop " | |
9851 | "initial declaration", decl); | |
9852 | else if (DECL_EXTERNAL (decl)) | |
9853 | error_at (decl_loc, | |
9854 | "declaration of %<extern%> variable %qD in %<for%> loop " | |
9855 | "initial declaration", decl); | |
9856 | } | |
f75fbaf7 ZW |
9857 | break; |
9858 | ||
9859 | case RECORD_TYPE: | |
c2255bc4 AH |
9860 | error_at (loc, |
9861 | "%<struct %E%> declared in %<for%> loop initial " | |
9862 | "declaration", id); | |
f75fbaf7 ZW |
9863 | break; |
9864 | case UNION_TYPE: | |
c2255bc4 AH |
9865 | error_at (loc, |
9866 | "%<union %E%> declared in %<for%> loop initial declaration", | |
9867 | id); | |
f75fbaf7 ZW |
9868 | break; |
9869 | case ENUMERAL_TYPE: | |
c2255bc4 AH |
9870 | error_at (loc, "%<enum %E%> declared in %<for%> loop " |
9871 | "initial declaration", id); | |
f75fbaf7 ZW |
9872 | break; |
9873 | default: | |
c2255bc4 AH |
9874 | error_at (loc, "declaration of non-variable " |
9875 | "%qD in %<for%> loop initial declaration", decl); | |
f75fbaf7 | 9876 | } |
953ff289 DN |
9877 | |
9878 | n_decls++; | |
9879 | one_decl = decl; | |
77c4d6c0 | 9880 | } |
953ff289 DN |
9881 | |
9882 | return n_decls == 1 ? one_decl : NULL_TREE; | |
77c4d6c0 JM |
9883 | } |
9884 | \f | |
51e29401 RS |
9885 | /* Save and reinitialize the variables |
9886 | used during compilation of a C function. */ | |
9887 | ||
9888 | void | |
d2784db4 | 9889 | c_push_function_context (void) |
51e29401 | 9890 | { |
b6fbbea3 MI |
9891 | struct language_function *p = cfun->language; |
9892 | /* cfun->language might have been already allocated by the use of | |
9893 | -Wunused-local-typedefs. In that case, just re-use it. */ | |
9894 | if (p == NULL) | |
766090c2 | 9895 | cfun->language = p = ggc_cleared_alloc<language_function> (); |
51e29401 | 9896 | |
8f17b5c5 | 9897 | p->base.x_stmt_tree = c_stmt_tree; |
9771b263 | 9898 | c_stmt_tree.x_cur_stmt_list = vec_safe_copy (c_stmt_tree.x_cur_stmt_list); |
506e2710 RH |
9899 | p->x_break_label = c_break_label; |
9900 | p->x_cont_label = c_cont_label; | |
9901 | p->x_switch_stack = c_switch_stack; | |
7b112487 | 9902 | p->arg_info = current_function_arg_info; |
51e29401 RS |
9903 | p->returns_value = current_function_returns_value; |
9904 | p->returns_null = current_function_returns_null; | |
5ce89b2e | 9905 | p->returns_abnormally = current_function_returns_abnormally; |
51e29401 | 9906 | p->warn_about_return_type = warn_about_return_type; |
d2784db4 PB |
9907 | |
9908 | push_function_context (); | |
51e29401 RS |
9909 | } |
9910 | ||
9911 | /* Restore the variables used during compilation of a C function. */ | |
9912 | ||
9913 | void | |
d2784db4 | 9914 | c_pop_function_context (void) |
51e29401 | 9915 | { |
d2784db4 PB |
9916 | struct language_function *p; |
9917 | ||
9918 | pop_function_context (); | |
9919 | p = cfun->language; | |
b6fbbea3 MI |
9920 | |
9921 | /* When -Wunused-local-typedefs is in effect, cfun->languages is | |
9922 | used to store data throughout the life time of the current cfun, | |
9923 | So don't deallocate it. */ | |
9924 | if (!warn_unused_local_typedefs) | |
9925 | cfun->language = NULL; | |
51e29401 | 9926 | |
1da326c3 | 9927 | if (DECL_STRUCT_FUNCTION (current_function_decl) == 0 |
8f17b5c5 | 9928 | && DECL_SAVED_TREE (current_function_decl) == NULL_TREE) |
51e29401 RS |
9929 | { |
9930 | /* Stop pointing to the local nodes about to be freed. */ | |
9931 | /* But DECL_INITIAL must remain nonzero so we know this | |
9932 | was an actual function definition. */ | |
9933 | DECL_INITIAL (current_function_decl) = error_mark_node; | |
3fa8871b | 9934 | DECL_ARGUMENTS (current_function_decl) = NULL_TREE; |
51e29401 RS |
9935 | } |
9936 | ||
8f17b5c5 | 9937 | c_stmt_tree = p->base.x_stmt_tree; |
b6fbbea3 | 9938 | p->base.x_stmt_tree.x_cur_stmt_list = NULL; |
506e2710 RH |
9939 | c_break_label = p->x_break_label; |
9940 | c_cont_label = p->x_cont_label; | |
9941 | c_switch_stack = p->x_switch_stack; | |
7b112487 | 9942 | current_function_arg_info = p->arg_info; |
51e29401 RS |
9943 | current_function_returns_value = p->returns_value; |
9944 | current_function_returns_null = p->returns_null; | |
5ce89b2e | 9945 | current_function_returns_abnormally = p->returns_abnormally; |
51e29401 | 9946 | warn_about_return_type = p->warn_about_return_type; |
1526a060 BS |
9947 | } |
9948 | ||
f2c5f623 BC |
9949 | /* The functions below are required for functionality of doing |
9950 | function at once processing in the C front end. Currently these | |
9951 | functions are not called from anywhere in the C front end, but as | |
6645c3fa | 9952 | these changes continue, that will change. */ |
f2c5f623 | 9953 | |
ae499cce MM |
9954 | /* Returns the stmt_tree (if any) to which statements are currently |
9955 | being added. If there is no active statement-tree, NULL is | |
9956 | returned. */ | |
9957 | ||
9958 | stmt_tree | |
35b1a6fa | 9959 | current_stmt_tree (void) |
ae499cce | 9960 | { |
8f17b5c5 MM |
9961 | return &c_stmt_tree; |
9962 | } | |
9963 | ||
339a28b9 | 9964 | /* Return the global value of T as a symbol. */ |
5fd8e536 JM |
9965 | |
9966 | tree | |
35b1a6fa | 9967 | identifier_global_value (tree t) |
5fd8e536 | 9968 | { |
f75fbaf7 | 9969 | struct c_binding *b; |
339a28b9 | 9970 | |
f75fbaf7 | 9971 | for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed) |
9aaabf8a | 9972 | if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b)) |
f75fbaf7 | 9973 | return b->decl; |
339a28b9 | 9974 | |
6574d78e | 9975 | return NULL_TREE; |
5fd8e536 | 9976 | } |
eaa7c03f | 9977 | |
3a636414 JM |
9978 | /* In C, the only C-linkage public declaration is at file scope. */ |
9979 | ||
9980 | tree | |
9981 | c_linkage_bindings (tree name) | |
9982 | { | |
9983 | return identifier_global_value (name); | |
9984 | } | |
9985 | ||
eaa7c03f JM |
9986 | /* Record a builtin type for C. If NAME is non-NULL, it is the name used; |
9987 | otherwise the name is found in ridpointers from RID_INDEX. */ | |
9988 | ||
9989 | void | |
35b1a6fa | 9990 | record_builtin_type (enum rid rid_index, const char *name, tree type) |
eaa7c03f | 9991 | { |
ca043393 | 9992 | tree id, decl; |
eaa7c03f JM |
9993 | if (name == 0) |
9994 | id = ridpointers[(int) rid_index]; | |
9995 | else | |
9996 | id = get_identifier (name); | |
c2255bc4 | 9997 | decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type); |
ca043393 ZW |
9998 | pushdecl (decl); |
9999 | if (debug_hooks->type_decl) | |
10000 | debug_hooks->type_decl (decl, false); | |
eaa7c03f JM |
10001 | } |
10002 | ||
10003 | /* Build the void_list_node (void_type_node having been created). */ | |
10004 | tree | |
35b1a6fa | 10005 | build_void_list_node (void) |
eaa7c03f JM |
10006 | { |
10007 | tree t = build_tree_list (NULL_TREE, void_type_node); | |
10008 | return t; | |
10009 | } | |
81a75f0f | 10010 | |
f8893e47 | 10011 | /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */ |
00325bce | 10012 | |
f8893e47 | 10013 | struct c_parm * |
deb176fa | 10014 | build_c_parm (struct c_declspecs *specs, tree attrs, |
8139a48e DM |
10015 | struct c_declarator *declarator, |
10016 | location_t loc) | |
00325bce | 10017 | { |
f8893e47 JM |
10018 | struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm); |
10019 | ret->specs = specs; | |
10020 | ret->attrs = attrs; | |
10021 | ret->declarator = declarator; | |
8139a48e | 10022 | ret->loc = loc; |
f8893e47 | 10023 | return ret; |
00325bce JM |
10024 | } |
10025 | ||
10026 | /* Return a declarator with nested attributes. TARGET is the inner | |
10027 | declarator to which these attributes apply. ATTRS are the | |
10028 | attributes. */ | |
10029 | ||
f8893e47 JM |
10030 | struct c_declarator * |
10031 | build_attrs_declarator (tree attrs, struct c_declarator *target) | |
00325bce | 10032 | { |
f8893e47 JM |
10033 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); |
10034 | ret->kind = cdk_attrs; | |
10035 | ret->declarator = target; | |
10036 | ret->u.attrs = attrs; | |
10037 | return ret; | |
00325bce JM |
10038 | } |
10039 | ||
10040 | /* Return a declarator for a function with arguments specified by ARGS | |
10041 | and return type specified by TARGET. */ | |
10042 | ||
f8893e47 JM |
10043 | struct c_declarator * |
10044 | build_function_declarator (struct c_arg_info *args, | |
10045 | struct c_declarator *target) | |
00325bce | 10046 | { |
f8893e47 JM |
10047 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); |
10048 | ret->kind = cdk_function; | |
10049 | ret->declarator = target; | |
10050 | ret->u.arg_info = args; | |
10051 | return ret; | |
10052 | } | |
10053 | ||
10054 | /* Return a declarator for the identifier IDENT (which may be | |
10055 | NULL_TREE for an abstract declarator). */ | |
10056 | ||
10057 | struct c_declarator * | |
10058 | build_id_declarator (tree ident) | |
10059 | { | |
10060 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); | |
10061 | ret->kind = cdk_id; | |
10062 | ret->declarator = 0; | |
10063 | ret->u.id = ident; | |
6037d88d PB |
10064 | /* Default value - may get reset to a more precise location. */ |
10065 | ret->id_loc = input_location; | |
f8893e47 | 10066 | return ret; |
00325bce JM |
10067 | } |
10068 | ||
81a75f0f NB |
10069 | /* Return something to represent absolute declarators containing a *. |
10070 | TARGET is the absolute declarator that the * contains. | |
deb176fa JM |
10071 | TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes |
10072 | to apply to the pointer type. */ | |
81a75f0f | 10073 | |
f8893e47 | 10074 | struct c_declarator * |
deb176fa JM |
10075 | make_pointer_declarator (struct c_declspecs *type_quals_attrs, |
10076 | struct c_declarator *target) | |
81a75f0f | 10077 | { |
deb176fa | 10078 | tree attrs; |
3b53cddc | 10079 | int quals = 0; |
f8893e47 JM |
10080 | struct c_declarator *itarget = target; |
10081 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); | |
deb176fa JM |
10082 | if (type_quals_attrs) |
10083 | { | |
10084 | attrs = type_quals_attrs->attrs; | |
3b53cddc | 10085 | quals = quals_from_declspecs (type_quals_attrs); |
deb176fa JM |
10086 | if (attrs != NULL_TREE) |
10087 | itarget = build_attrs_declarator (attrs, target); | |
10088 | } | |
f8893e47 JM |
10089 | ret->kind = cdk_pointer; |
10090 | ret->declarator = itarget; | |
3b53cddc | 10091 | ret->u.pointer_quals = quals; |
deb176fa JM |
10092 | return ret; |
10093 | } | |
10094 | ||
10095 | /* Return a pointer to a structure for an empty list of declaration | |
10096 | specifiers. */ | |
10097 | ||
10098 | struct c_declspecs * | |
10099 | build_null_declspecs (void) | |
10100 | { | |
10101 | struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs); | |
f48dfe98 | 10102 | memset (ret, 0, sizeof *ret); |
d19fa6b5 | 10103 | ret->align_log = -1; |
98c3a782 | 10104 | ret->typespec_word = cts_none; |
9a26d6ee | 10105 | ret->storage_class = csc_none; |
928c19bb | 10106 | ret->expr_const_operands = true; |
9e5b2115 | 10107 | ret->typespec_kind = ctsk_none; |
36c5e70a | 10108 | ret->address_space = ADDR_SPACE_GENERIC; |
f8893e47 | 10109 | return ret; |
81a75f0f | 10110 | } |
e2500fed | 10111 | |
36c5e70a BE |
10112 | /* Add the address space ADDRSPACE to the declaration specifiers |
10113 | SPECS, returning SPECS. */ | |
10114 | ||
10115 | struct c_declspecs * | |
620e594b | 10116 | declspecs_add_addrspace (location_t location, |
0b2c4be5 | 10117 | struct c_declspecs *specs, addr_space_t as) |
36c5e70a BE |
10118 | { |
10119 | specs->non_sc_seen_p = true; | |
10120 | specs->declspecs_seen_p = true; | |
10121 | ||
10122 | if (!ADDR_SPACE_GENERIC_P (specs->address_space) | |
10123 | && specs->address_space != as) | |
10124 | error ("incompatible address space qualifiers %qs and %qs", | |
10125 | c_addr_space_name (as), | |
10126 | c_addr_space_name (specs->address_space)); | |
10127 | else | |
0b2c4be5 DS |
10128 | { |
10129 | specs->address_space = as; | |
10130 | specs->locations[cdw_address_space] = location; | |
10131 | } | |
36c5e70a BE |
10132 | return specs; |
10133 | } | |
10134 | ||
deb176fa JM |
10135 | /* Add the type qualifier QUAL to the declaration specifiers SPECS, |
10136 | returning SPECS. */ | |
10137 | ||
10138 | struct c_declspecs * | |
620e594b | 10139 | declspecs_add_qual (location_t loc, |
0b2c4be5 | 10140 | struct c_declspecs *specs, tree qual) |
deb176fa JM |
10141 | { |
10142 | enum rid i; | |
3b53cddc | 10143 | bool dupe = false; |
deb176fa | 10144 | specs->non_sc_seen_p = true; |
27bf414c | 10145 | specs->declspecs_seen_p = true; |
deb176fa JM |
10146 | gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE |
10147 | && C_IS_RESERVED_WORD (qual)); | |
10148 | i = C_RID_CODE (qual); | |
e3455240 | 10149 | location_t prev_loc = UNKNOWN_LOCATION; |
3b53cddc JM |
10150 | switch (i) |
10151 | { | |
10152 | case RID_CONST: | |
10153 | dupe = specs->const_p; | |
10154 | specs->const_p = true; | |
d6e83a8d | 10155 | prev_loc = specs->locations[cdw_const]; |
0b2c4be5 | 10156 | specs->locations[cdw_const] = loc; |
3b53cddc JM |
10157 | break; |
10158 | case RID_VOLATILE: | |
10159 | dupe = specs->volatile_p; | |
10160 | specs->volatile_p = true; | |
d6e83a8d | 10161 | prev_loc = specs->locations[cdw_volatile]; |
0b2c4be5 | 10162 | specs->locations[cdw_volatile] = loc; |
3b53cddc JM |
10163 | break; |
10164 | case RID_RESTRICT: | |
10165 | dupe = specs->restrict_p; | |
10166 | specs->restrict_p = true; | |
d6e83a8d | 10167 | prev_loc = specs->locations[cdw_restrict]; |
0b2c4be5 | 10168 | specs->locations[cdw_restrict] = loc; |
3b53cddc | 10169 | break; |
267bac10 JM |
10170 | case RID_ATOMIC: |
10171 | dupe = specs->atomic_p; | |
10172 | specs->atomic_p = true; | |
d6e83a8d MM |
10173 | prev_loc = specs->locations[cdw_atomic]; |
10174 | specs->locations[cdw_atomic] = loc; | |
267bac10 | 10175 | break; |
3b53cddc JM |
10176 | default: |
10177 | gcc_unreachable (); | |
10178 | } | |
f3bede71 | 10179 | if (dupe) |
d6e83a8d MM |
10180 | { |
10181 | bool warned = pedwarn_c90 (loc, OPT_Wpedantic, | |
10182 | "duplicate %qE declaration specifier", qual); | |
10183 | if (!warned | |
10184 | && warn_duplicate_decl_specifier | |
10185 | && prev_loc >= RESERVED_LOCATION_COUNT | |
10186 | && !from_macro_expansion_at (prev_loc) | |
10187 | && !from_macro_expansion_at (loc)) | |
10188 | warning_at (loc, OPT_Wduplicate_decl_specifier, | |
10189 | "duplicate %qE declaration specifier", qual); | |
10190 | } | |
deb176fa JM |
10191 | return specs; |
10192 | } | |
10193 | ||
10194 | /* Add the type specifier TYPE to the declaration specifiers SPECS, | |
10195 | returning SPECS. */ | |
10196 | ||
10197 | struct c_declspecs * | |
dc491a25 ILT |
10198 | declspecs_add_type (location_t loc, struct c_declspecs *specs, |
10199 | struct c_typespec spec) | |
deb176fa | 10200 | { |
81da229b | 10201 | tree type = spec.spec; |
deb176fa | 10202 | specs->non_sc_seen_p = true; |
27bf414c | 10203 | specs->declspecs_seen_p = true; |
9e5b2115 | 10204 | specs->typespec_kind = spec.kind; |
deb176fa JM |
10205 | if (TREE_DEPRECATED (type)) |
10206 | specs->deprecated_p = true; | |
deb176fa | 10207 | |
98c3a782 | 10208 | /* Handle type specifier keywords. */ |
eea1139b ILT |
10209 | if (TREE_CODE (type) == IDENTIFIER_NODE |
10210 | && C_IS_RESERVED_WORD (type) | |
10211 | && C_RID_CODE (type) != RID_CXX_COMPAT_WARN) | |
deb176fa JM |
10212 | { |
10213 | enum rid i = C_RID_CODE (type); | |
98c3a782 JM |
10214 | if (specs->type) |
10215 | { | |
dc491a25 | 10216 | error_at (loc, "two or more data types in declaration specifiers"); |
98c3a782 JM |
10217 | return specs; |
10218 | } | |
deb176fa JM |
10219 | if ((int) i <= (int) RID_LAST_MODIFIER) |
10220 | { | |
ab22c1fa | 10221 | /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */ |
98c3a782 JM |
10222 | bool dupe = false; |
10223 | switch (i) | |
deb176fa | 10224 | { |
98c3a782 | 10225 | case RID_LONG: |
deb176fa | 10226 | if (specs->long_long_p) |
deb176fa | 10227 | { |
dc491a25 | 10228 | error_at (loc, "%<long long long%> is too long for GCC"); |
98c3a782 JM |
10229 | break; |
10230 | } | |
10231 | if (specs->long_p) | |
10232 | { | |
10233 | if (specs->typespec_word == cts_double) | |
10234 | { | |
dc491a25 ILT |
10235 | error_at (loc, |
10236 | ("both %<long long%> and %<double%> in " | |
10237 | "declaration specifiers")); | |
98c3a782 JM |
10238 | break; |
10239 | } | |
dc491a25 | 10240 | pedwarn_c90 (loc, OPT_Wlong_long, |
9c650d90 | 10241 | "ISO C90 does not support %<long long%>"); |
deb176fa | 10242 | specs->long_long_p = 1; |
0b2c4be5 | 10243 | specs->locations[cdw_long_long] = loc; |
98c3a782 | 10244 | break; |
deb176fa | 10245 | } |
98c3a782 | 10246 | if (specs->short_p) |
dc491a25 ILT |
10247 | error_at (loc, |
10248 | ("both %<long%> and %<short%> in " | |
10249 | "declaration specifiers")); | |
38b7bc7f JM |
10250 | else if (specs->typespec_word == cts_auto_type) |
10251 | error_at (loc, | |
10252 | ("both %<long%> and %<__auto_type%> in " | |
10253 | "declaration specifiers")); | |
98c3a782 | 10254 | else if (specs->typespec_word == cts_void) |
dc491a25 ILT |
10255 | error_at (loc, |
10256 | ("both %<long%> and %<void%> in " | |
10257 | "declaration specifiers")); | |
78a7c317 | 10258 | else if (specs->typespec_word == cts_int_n) |
a6766312 | 10259 | error_at (loc, |
78a7c317 DD |
10260 | ("both %<long%> and %<__int%d%> in " |
10261 | "declaration specifiers"), | |
10262 | int_n_data[specs->int_n_idx].bitsize); | |
98c3a782 | 10263 | else if (specs->typespec_word == cts_bool) |
dc491a25 ILT |
10264 | error_at (loc, |
10265 | ("both %<long%> and %<_Bool%> in " | |
10266 | "declaration specifiers")); | |
98c3a782 | 10267 | else if (specs->typespec_word == cts_char) |
dc491a25 ILT |
10268 | error_at (loc, |
10269 | ("both %<long%> and %<char%> in " | |
10270 | "declaration specifiers")); | |
98c3a782 | 10271 | else if (specs->typespec_word == cts_float) |
dc491a25 ILT |
10272 | error_at (loc, |
10273 | ("both %<long%> and %<float%> in " | |
10274 | "declaration specifiers")); | |
c65699ef JM |
10275 | else if (specs->typespec_word == cts_floatn_nx) |
10276 | error_at (loc, | |
10277 | ("both %<long%> and %<_Float%d%s%> in " | |
10278 | "declaration specifiers"), | |
10279 | floatn_nx_types[specs->floatn_nx_idx].n, | |
10280 | (floatn_nx_types[specs->floatn_nx_idx].extended | |
10281 | ? "x" | |
10282 | : "")); | |
9a8ce21f | 10283 | else if (specs->typespec_word == cts_dfloat32) |
dc491a25 ILT |
10284 | error_at (loc, |
10285 | ("both %<long%> and %<_Decimal32%> in " | |
10286 | "declaration specifiers")); | |
9a8ce21f | 10287 | else if (specs->typespec_word == cts_dfloat64) |
dc491a25 ILT |
10288 | error_at (loc, |
10289 | ("both %<long%> and %<_Decimal64%> in " | |
10290 | "declaration specifiers")); | |
9a8ce21f | 10291 | else if (specs->typespec_word == cts_dfloat128) |
dc491a25 ILT |
10292 | error_at (loc, |
10293 | ("both %<long%> and %<_Decimal128%> in " | |
10294 | "declaration specifiers")); | |
98c3a782 | 10295 | else |
0b2c4be5 DS |
10296 | { |
10297 | specs->long_p = true; | |
10298 | specs->locations[cdw_long] = loc; | |
10299 | } | |
98c3a782 JM |
10300 | break; |
10301 | case RID_SHORT: | |
10302 | dupe = specs->short_p; | |
10303 | if (specs->long_p) | |
dc491a25 ILT |
10304 | error_at (loc, |
10305 | ("both %<long%> and %<short%> in " | |
10306 | "declaration specifiers")); | |
38b7bc7f JM |
10307 | else if (specs->typespec_word == cts_auto_type) |
10308 | error_at (loc, | |
10309 | ("both %<short%> and %<__auto_type%> in " | |
10310 | "declaration specifiers")); | |
98c3a782 | 10311 | else if (specs->typespec_word == cts_void) |
dc491a25 ILT |
10312 | error_at (loc, |
10313 | ("both %<short%> and %<void%> in " | |
10314 | "declaration specifiers")); | |
78a7c317 | 10315 | else if (specs->typespec_word == cts_int_n) |
a6766312 | 10316 | error_at (loc, |
78a7c317 DD |
10317 | ("both %<short%> and %<__int%d%> in " |
10318 | "declaration specifiers"), | |
10319 | int_n_data[specs->int_n_idx].bitsize); | |
98c3a782 | 10320 | else if (specs->typespec_word == cts_bool) |
dc491a25 ILT |
10321 | error_at (loc, |
10322 | ("both %<short%> and %<_Bool%> in " | |
10323 | "declaration specifiers")); | |
98c3a782 | 10324 | else if (specs->typespec_word == cts_char) |
dc491a25 ILT |
10325 | error_at (loc, |
10326 | ("both %<short%> and %<char%> in " | |
10327 | "declaration specifiers")); | |
98c3a782 | 10328 | else if (specs->typespec_word == cts_float) |
dc491a25 ILT |
10329 | error_at (loc, |
10330 | ("both %<short%> and %<float%> in " | |
10331 | "declaration specifiers")); | |
98c3a782 | 10332 | else if (specs->typespec_word == cts_double) |
dc491a25 ILT |
10333 | error_at (loc, |
10334 | ("both %<short%> and %<double%> in " | |
10335 | "declaration specifiers")); | |
c65699ef JM |
10336 | else if (specs->typespec_word == cts_floatn_nx) |
10337 | error_at (loc, | |
10338 | ("both %<short%> and %<_Float%d%s%> in " | |
10339 | "declaration specifiers"), | |
10340 | floatn_nx_types[specs->floatn_nx_idx].n, | |
10341 | (floatn_nx_types[specs->floatn_nx_idx].extended | |
10342 | ? "x" | |
10343 | : "")); | |
9a8ce21f | 10344 | else if (specs->typespec_word == cts_dfloat32) |
dc491a25 ILT |
10345 | error_at (loc, |
10346 | ("both %<short%> and %<_Decimal32%> in " | |
10347 | "declaration specifiers")); | |
9a8ce21f | 10348 | else if (specs->typespec_word == cts_dfloat64) |
dc491a25 ILT |
10349 | error_at (loc, |
10350 | ("both %<short%> and %<_Decimal64%> in " | |
10351 | "declaration specifiers")); | |
9a8ce21f | 10352 | else if (specs->typespec_word == cts_dfloat128) |
dc491a25 ILT |
10353 | error_at (loc, |
10354 | ("both %<short%> and %<_Decimal128%> in " | |
10355 | "declaration specifiers")); | |
98c3a782 | 10356 | else |
0b2c4be5 DS |
10357 | { |
10358 | specs->short_p = true; | |
10359 | specs->locations[cdw_short] = loc; | |
10360 | } | |
98c3a782 JM |
10361 | break; |
10362 | case RID_SIGNED: | |
10363 | dupe = specs->signed_p; | |
10364 | if (specs->unsigned_p) | |
dc491a25 ILT |
10365 | error_at (loc, |
10366 | ("both %<signed%> and %<unsigned%> in " | |
10367 | "declaration specifiers")); | |
38b7bc7f JM |
10368 | else if (specs->typespec_word == cts_auto_type) |
10369 | error_at (loc, | |
10370 | ("both %<signed%> and %<__auto_type%> in " | |
10371 | "declaration specifiers")); | |
98c3a782 | 10372 | else if (specs->typespec_word == cts_void) |
dc491a25 ILT |
10373 | error_at (loc, |
10374 | ("both %<signed%> and %<void%> in " | |
10375 | "declaration specifiers")); | |
98c3a782 | 10376 | else if (specs->typespec_word == cts_bool) |
dc491a25 ILT |
10377 | error_at (loc, |
10378 | ("both %<signed%> and %<_Bool%> in " | |
10379 | "declaration specifiers")); | |
98c3a782 | 10380 | else if (specs->typespec_word == cts_float) |
dc491a25 ILT |
10381 | error_at (loc, |
10382 | ("both %<signed%> and %<float%> in " | |
10383 | "declaration specifiers")); | |
98c3a782 | 10384 | else if (specs->typespec_word == cts_double) |
dc491a25 ILT |
10385 | error_at (loc, |
10386 | ("both %<signed%> and %<double%> in " | |
10387 | "declaration specifiers")); | |
c65699ef JM |
10388 | else if (specs->typespec_word == cts_floatn_nx) |
10389 | error_at (loc, | |
10390 | ("both %<signed%> and %<_Float%d%s%> in " | |
10391 | "declaration specifiers"), | |
10392 | floatn_nx_types[specs->floatn_nx_idx].n, | |
10393 | (floatn_nx_types[specs->floatn_nx_idx].extended | |
10394 | ? "x" | |
10395 | : "")); | |
9a8ce21f | 10396 | else if (specs->typespec_word == cts_dfloat32) |
dc491a25 ILT |
10397 | error_at (loc, |
10398 | ("both %<signed%> and %<_Decimal32%> in " | |
10399 | "declaration specifiers")); | |
9a8ce21f | 10400 | else if (specs->typespec_word == cts_dfloat64) |
dc491a25 ILT |
10401 | error_at (loc, |
10402 | ("both %<signed%> and %<_Decimal64%> in " | |
10403 | "declaration specifiers")); | |
9a8ce21f | 10404 | else if (specs->typespec_word == cts_dfloat128) |
dc491a25 ILT |
10405 | error_at (loc, |
10406 | ("both %<signed%> and %<_Decimal128%> in " | |
10407 | "declaration specifiers")); | |
98c3a782 | 10408 | else |
0b2c4be5 DS |
10409 | { |
10410 | specs->signed_p = true; | |
10411 | specs->locations[cdw_signed] = loc; | |
10412 | } | |
98c3a782 JM |
10413 | break; |
10414 | case RID_UNSIGNED: | |
10415 | dupe = specs->unsigned_p; | |
10416 | if (specs->signed_p) | |
dc491a25 ILT |
10417 | error_at (loc, |
10418 | ("both %<signed%> and %<unsigned%> in " | |
10419 | "declaration specifiers")); | |
38b7bc7f JM |
10420 | else if (specs->typespec_word == cts_auto_type) |
10421 | error_at (loc, | |
10422 | ("both %<unsigned%> and %<__auto_type%> in " | |
10423 | "declaration specifiers")); | |
98c3a782 | 10424 | else if (specs->typespec_word == cts_void) |
dc491a25 ILT |
10425 | error_at (loc, |
10426 | ("both %<unsigned%> and %<void%> in " | |
10427 | "declaration specifiers")); | |
98c3a782 | 10428 | else if (specs->typespec_word == cts_bool) |
dc491a25 ILT |
10429 | error_at (loc, |
10430 | ("both %<unsigned%> and %<_Bool%> in " | |
10431 | "declaration specifiers")); | |
98c3a782 | 10432 | else if (specs->typespec_word == cts_float) |
dc491a25 ILT |
10433 | error_at (loc, |
10434 | ("both %<unsigned%> and %<float%> in " | |
10435 | "declaration specifiers")); | |
98c3a782 | 10436 | else if (specs->typespec_word == cts_double) |
dc491a25 ILT |
10437 | error_at (loc, |
10438 | ("both %<unsigned%> and %<double%> in " | |
10439 | "declaration specifiers")); | |
c65699ef JM |
10440 | else if (specs->typespec_word == cts_floatn_nx) |
10441 | error_at (loc, | |
10442 | ("both %<unsigned%> and %<_Float%d%s%> in " | |
10443 | "declaration specifiers"), | |
10444 | floatn_nx_types[specs->floatn_nx_idx].n, | |
10445 | (floatn_nx_types[specs->floatn_nx_idx].extended | |
10446 | ? "x" | |
10447 | : "")); | |
9a8ce21f | 10448 | else if (specs->typespec_word == cts_dfloat32) |
dc491a25 ILT |
10449 | error_at (loc, |
10450 | ("both %<unsigned%> and %<_Decimal32%> in " | |
10451 | "declaration specifiers")); | |
9a8ce21f | 10452 | else if (specs->typespec_word == cts_dfloat64) |
dc491a25 ILT |
10453 | error_at (loc, |
10454 | ("both %<unsigned%> and %<_Decimal64%> in " | |
10455 | "declaration specifiers")); | |
9a8ce21f | 10456 | else if (specs->typespec_word == cts_dfloat128) |
dc491a25 ILT |
10457 | error_at (loc, |
10458 | ("both %<unsigned%> and %<_Decimal128%> in " | |
10459 | "declaration specifiers")); | |
98c3a782 | 10460 | else |
0b2c4be5 DS |
10461 | { |
10462 | specs->unsigned_p = true; | |
10463 | specs->locations[cdw_unsigned] = loc; | |
10464 | } | |
98c3a782 JM |
10465 | break; |
10466 | case RID_COMPLEX: | |
10467 | dupe = specs->complex_p; | |
f3bede71 MP |
10468 | if (!in_system_header_at (loc)) |
10469 | pedwarn_c90 (loc, OPT_Wpedantic, | |
10470 | "ISO C90 does not support complex types"); | |
38b7bc7f JM |
10471 | if (specs->typespec_word == cts_auto_type) |
10472 | error_at (loc, | |
10473 | ("both %<complex%> and %<__auto_type%> in " | |
10474 | "declaration specifiers")); | |
10475 | else if (specs->typespec_word == cts_void) | |
dc491a25 ILT |
10476 | error_at (loc, |
10477 | ("both %<complex%> and %<void%> in " | |
10478 | "declaration specifiers")); | |
98c3a782 | 10479 | else if (specs->typespec_word == cts_bool) |
dc491a25 ILT |
10480 | error_at (loc, |
10481 | ("both %<complex%> and %<_Bool%> in " | |
10482 | "declaration specifiers")); | |
9a8ce21f | 10483 | else if (specs->typespec_word == cts_dfloat32) |
dc491a25 ILT |
10484 | error_at (loc, |
10485 | ("both %<complex%> and %<_Decimal32%> in " | |
10486 | "declaration specifiers")); | |
9a8ce21f | 10487 | else if (specs->typespec_word == cts_dfloat64) |
dc491a25 ILT |
10488 | error_at (loc, |
10489 | ("both %<complex%> and %<_Decimal64%> in " | |
10490 | "declaration specifiers")); | |
9a8ce21f | 10491 | else if (specs->typespec_word == cts_dfloat128) |
dc491a25 ILT |
10492 | error_at (loc, |
10493 | ("both %<complex%> and %<_Decimal128%> in " | |
10494 | "declaration specifiers")); | |
ab22c1fa | 10495 | else if (specs->typespec_word == cts_fract) |
dc491a25 ILT |
10496 | error_at (loc, |
10497 | ("both %<complex%> and %<_Fract%> in " | |
10498 | "declaration specifiers")); | |
ab22c1fa | 10499 | else if (specs->typespec_word == cts_accum) |
dc491a25 ILT |
10500 | error_at (loc, |
10501 | ("both %<complex%> and %<_Accum%> in " | |
10502 | "declaration specifiers")); | |
ab22c1fa | 10503 | else if (specs->saturating_p) |
dc491a25 ILT |
10504 | error_at (loc, |
10505 | ("both %<complex%> and %<_Sat%> in " | |
10506 | "declaration specifiers")); | |
98c3a782 | 10507 | else |
0b2c4be5 DS |
10508 | { |
10509 | specs->complex_p = true; | |
10510 | specs->locations[cdw_complex] = loc; | |
10511 | } | |
98c3a782 | 10512 | break; |
ab22c1fa CF |
10513 | case RID_SAT: |
10514 | dupe = specs->saturating_p; | |
c1771a20 | 10515 | pedwarn (loc, OPT_Wpedantic, |
dc491a25 | 10516 | "ISO C does not support saturating types"); |
78a7c317 | 10517 | if (specs->typespec_word == cts_int_n) |
a6766312 KT |
10518 | { |
10519 | error_at (loc, | |
78a7c317 DD |
10520 | ("both %<_Sat%> and %<__int%d%> in " |
10521 | "declaration specifiers"), | |
10522 | int_n_data[specs->int_n_idx].bitsize); | |
a6766312 | 10523 | } |
38b7bc7f JM |
10524 | else if (specs->typespec_word == cts_auto_type) |
10525 | error_at (loc, | |
10526 | ("both %<_Sat%> and %<__auto_type%> in " | |
10527 | "declaration specifiers")); | |
a6766312 | 10528 | else if (specs->typespec_word == cts_void) |
dc491a25 ILT |
10529 | error_at (loc, |
10530 | ("both %<_Sat%> and %<void%> in " | |
10531 | "declaration specifiers")); | |
ab22c1fa | 10532 | else if (specs->typespec_word == cts_bool) |
dc491a25 ILT |
10533 | error_at (loc, |
10534 | ("both %<_Sat%> and %<_Bool%> in " | |
10535 | "declaration specifiers")); | |
ab22c1fa | 10536 | else if (specs->typespec_word == cts_char) |
dc491a25 ILT |
10537 | error_at (loc, |
10538 | ("both %<_Sat%> and %<char%> in " | |
10539 | "declaration specifiers")); | |
ab22c1fa | 10540 | else if (specs->typespec_word == cts_int) |
dc491a25 ILT |
10541 | error_at (loc, |
10542 | ("both %<_Sat%> and %<int%> in " | |
10543 | "declaration specifiers")); | |
ab22c1fa | 10544 | else if (specs->typespec_word == cts_float) |
dc491a25 ILT |
10545 | error_at (loc, |
10546 | ("both %<_Sat%> and %<float%> in " | |
10547 | "declaration specifiers")); | |
ab22c1fa | 10548 | else if (specs->typespec_word == cts_double) |
dc491a25 ILT |
10549 | error_at (loc, |
10550 | ("both %<_Sat%> and %<double%> in " | |
10551 | "declaration specifiers")); | |
c65699ef JM |
10552 | else if (specs->typespec_word == cts_floatn_nx) |
10553 | error_at (loc, | |
10554 | ("both %<_Sat%> and %<_Float%d%s%> in " | |
10555 | "declaration specifiers"), | |
10556 | floatn_nx_types[specs->floatn_nx_idx].n, | |
10557 | (floatn_nx_types[specs->floatn_nx_idx].extended | |
10558 | ? "x" | |
10559 | : "")); | |
ab22c1fa | 10560 | else if (specs->typespec_word == cts_dfloat32) |
dc491a25 ILT |
10561 | error_at (loc, |
10562 | ("both %<_Sat%> and %<_Decimal32%> in " | |
10563 | "declaration specifiers")); | |
ab22c1fa | 10564 | else if (specs->typespec_word == cts_dfloat64) |
dc491a25 ILT |
10565 | error_at (loc, |
10566 | ("both %<_Sat%> and %<_Decimal64%> in " | |
10567 | "declaration specifiers")); | |
ab22c1fa | 10568 | else if (specs->typespec_word == cts_dfloat128) |
dc491a25 ILT |
10569 | error_at (loc, |
10570 | ("both %<_Sat%> and %<_Decimal128%> in " | |
10571 | "declaration specifiers")); | |
ab22c1fa | 10572 | else if (specs->complex_p) |
dc491a25 ILT |
10573 | error_at (loc, |
10574 | ("both %<_Sat%> and %<complex%> in " | |
10575 | "declaration specifiers")); | |
ab22c1fa | 10576 | else |
0b2c4be5 DS |
10577 | { |
10578 | specs->saturating_p = true; | |
10579 | specs->locations[cdw_saturating] = loc; | |
10580 | } | |
ab22c1fa | 10581 | break; |
98c3a782 JM |
10582 | default: |
10583 | gcc_unreachable (); | |
deb176fa | 10584 | } |
98c3a782 JM |
10585 | |
10586 | if (dupe) | |
dc491a25 | 10587 | error_at (loc, "duplicate %qE", type); |
deb176fa | 10588 | |
deb176fa JM |
10589 | return specs; |
10590 | } | |
98c3a782 JM |
10591 | else |
10592 | { | |
c65699ef JM |
10593 | /* "void", "_Bool", "char", "int", "float", "double", |
10594 | "_FloatN", "_FloatNx", "_Decimal32", "__intN", | |
10595 | "_Decimal64", "_Decimal128", "_Fract", "_Accum" or | |
38b7bc7f | 10596 | "__auto_type". */ |
98c3a782 JM |
10597 | if (specs->typespec_word != cts_none) |
10598 | { | |
dc491a25 ILT |
10599 | error_at (loc, |
10600 | "two or more data types in declaration specifiers"); | |
98c3a782 JM |
10601 | return specs; |
10602 | } | |
10603 | switch (i) | |
10604 | { | |
38b7bc7f JM |
10605 | case RID_AUTO_TYPE: |
10606 | if (specs->long_p) | |
10607 | error_at (loc, | |
10608 | ("both %<long%> and %<__auto_type%> in " | |
10609 | "declaration specifiers")); | |
10610 | else if (specs->short_p) | |
10611 | error_at (loc, | |
10612 | ("both %<short%> and %<__auto_type%> in " | |
10613 | "declaration specifiers")); | |
10614 | else if (specs->signed_p) | |
10615 | error_at (loc, | |
10616 | ("both %<signed%> and %<__auto_type%> in " | |
10617 | "declaration specifiers")); | |
10618 | else if (specs->unsigned_p) | |
10619 | error_at (loc, | |
10620 | ("both %<unsigned%> and %<__auto_type%> in " | |
10621 | "declaration specifiers")); | |
10622 | else if (specs->complex_p) | |
10623 | error_at (loc, | |
10624 | ("both %<complex%> and %<__auto_type%> in " | |
10625 | "declaration specifiers")); | |
10626 | else if (specs->saturating_p) | |
10627 | error_at (loc, | |
10628 | ("both %<_Sat%> and %<__auto_type%> in " | |
10629 | "declaration specifiers")); | |
10630 | else | |
10631 | { | |
10632 | specs->typespec_word = cts_auto_type; | |
10633 | specs->locations[cdw_typespec] = loc; | |
10634 | } | |
10635 | return specs; | |
78a7c317 DD |
10636 | case RID_INT_N_0: |
10637 | case RID_INT_N_1: | |
10638 | case RID_INT_N_2: | |
10639 | case RID_INT_N_3: | |
10640 | specs->int_n_idx = i - RID_INT_N_0; | |
5e580306 JL |
10641 | if (!in_system_header_at (input_location) |
10642 | /* If the INT_N type ends in "__", and so is of the format | |
10643 | "__intN__", don't pedwarn. */ | |
10644 | && (strncmp (IDENTIFIER_POINTER (type) | |
10645 | + (IDENTIFIER_LENGTH (type) - 2), "__", 2) != 0)) | |
c1771a20 | 10646 | pedwarn (loc, OPT_Wpedantic, |
78a7c317 DD |
10647 | "ISO C does not support %<__int%d%> types", |
10648 | int_n_data[specs->int_n_idx].bitsize); | |
a6766312 KT |
10649 | |
10650 | if (specs->long_p) | |
10651 | error_at (loc, | |
78a7c317 DD |
10652 | ("both %<__int%d%> and %<long%> in " |
10653 | "declaration specifiers"), | |
10654 | int_n_data[specs->int_n_idx].bitsize); | |
a6766312 KT |
10655 | else if (specs->saturating_p) |
10656 | error_at (loc, | |
78a7c317 DD |
10657 | ("both %<_Sat%> and %<__int%d%> in " |
10658 | "declaration specifiers"), | |
10659 | int_n_data[specs->int_n_idx].bitsize); | |
a6766312 KT |
10660 | else if (specs->short_p) |
10661 | error_at (loc, | |
78a7c317 DD |
10662 | ("both %<__int%d%> and %<short%> in " |
10663 | "declaration specifiers"), | |
10664 | int_n_data[specs->int_n_idx].bitsize); | |
fe377a48 MP |
10665 | else if (! int_n_enabled_p[specs->int_n_idx]) |
10666 | { | |
10667 | specs->typespec_word = cts_int_n; | |
10668 | error_at (loc, | |
10669 | "%<__int%d%> is not supported on this target", | |
10670 | int_n_data[specs->int_n_idx].bitsize); | |
10671 | } | |
a6766312 | 10672 | else |
0b2c4be5 | 10673 | { |
78a7c317 | 10674 | specs->typespec_word = cts_int_n; |
0b2c4be5 DS |
10675 | specs->locations[cdw_typespec] = loc; |
10676 | } | |
a6766312 | 10677 | return specs; |
98c3a782 JM |
10678 | case RID_VOID: |
10679 | if (specs->long_p) | |
dc491a25 ILT |
10680 | error_at (loc, |
10681 | ("both %<long%> and %<void%> in " | |
10682 | "declaration specifiers")); | |
98c3a782 | 10683 | else if (specs->short_p) |
dc491a25 ILT |
10684 | error_at (loc, |
10685 | ("both %<short%> and %<void%> in " | |
10686 | "declaration specifiers")); | |
98c3a782 | 10687 | else if (specs->signed_p) |
dc491a25 ILT |
10688 | error_at (loc, |
10689 | ("both %<signed%> and %<void%> in " | |
10690 | "declaration specifiers")); | |
98c3a782 | 10691 | else if (specs->unsigned_p) |
dc491a25 ILT |
10692 | error_at (loc, |
10693 | ("both %<unsigned%> and %<void%> in " | |
10694 | "declaration specifiers")); | |
98c3a782 | 10695 | else if (specs->complex_p) |
dc491a25 ILT |
10696 | error_at (loc, |
10697 | ("both %<complex%> and %<void%> in " | |
10698 | "declaration specifiers")); | |
ab22c1fa | 10699 | else if (specs->saturating_p) |
dc491a25 ILT |
10700 | error_at (loc, |
10701 | ("both %<_Sat%> and %<void%> in " | |
10702 | "declaration specifiers")); | |
98c3a782 | 10703 | else |
0b2c4be5 DS |
10704 | { |
10705 | specs->typespec_word = cts_void; | |
10706 | specs->locations[cdw_typespec] = loc; | |
10707 | } | |
98c3a782 JM |
10708 | return specs; |
10709 | case RID_BOOL: | |
f3bede71 MP |
10710 | if (!in_system_header_at (loc)) |
10711 | pedwarn_c90 (loc, OPT_Wpedantic, | |
10712 | "ISO C90 does not support boolean types"); | |
98c3a782 | 10713 | if (specs->long_p) |
dc491a25 ILT |
10714 | error_at (loc, |
10715 | ("both %<long%> and %<_Bool%> in " | |
10716 | "declaration specifiers")); | |
98c3a782 | 10717 | else if (specs->short_p) |
dc491a25 ILT |
10718 | error_at (loc, |
10719 | ("both %<short%> and %<_Bool%> in " | |
10720 | "declaration specifiers")); | |
98c3a782 | 10721 | else if (specs->signed_p) |
dc491a25 ILT |
10722 | error_at (loc, |
10723 | ("both %<signed%> and %<_Bool%> in " | |
10724 | "declaration specifiers")); | |
98c3a782 | 10725 | else if (specs->unsigned_p) |
dc491a25 ILT |
10726 | error_at (loc, |
10727 | ("both %<unsigned%> and %<_Bool%> in " | |
10728 | "declaration specifiers")); | |
98c3a782 | 10729 | else if (specs->complex_p) |
dc491a25 ILT |
10730 | error_at (loc, |
10731 | ("both %<complex%> and %<_Bool%> in " | |
10732 | "declaration specifiers")); | |
ab22c1fa | 10733 | else if (specs->saturating_p) |
dc491a25 ILT |
10734 | error_at (loc, |
10735 | ("both %<_Sat%> and %<_Bool%> in " | |
10736 | "declaration specifiers")); | |
98c3a782 | 10737 | else |
0b2c4be5 DS |
10738 | { |
10739 | specs->typespec_word = cts_bool; | |
10740 | specs->locations[cdw_typespec] = loc; | |
10741 | } | |
98c3a782 JM |
10742 | return specs; |
10743 | case RID_CHAR: | |
10744 | if (specs->long_p) | |
dc491a25 ILT |
10745 | error_at (loc, |
10746 | ("both %<long%> and %<char%> in " | |
10747 | "declaration specifiers")); | |
98c3a782 | 10748 | else if (specs->short_p) |
dc491a25 ILT |
10749 | error_at (loc, |
10750 | ("both %<short%> and %<char%> in " | |
10751 | "declaration specifiers")); | |
ab22c1fa | 10752 | else if (specs->saturating_p) |
dc491a25 ILT |
10753 | error_at (loc, |
10754 | ("both %<_Sat%> and %<char%> in " | |
10755 | "declaration specifiers")); | |
98c3a782 | 10756 | else |
0b2c4be5 DS |
10757 | { |
10758 | specs->typespec_word = cts_char; | |
10759 | specs->locations[cdw_typespec] = loc; | |
10760 | } | |
98c3a782 JM |
10761 | return specs; |
10762 | case RID_INT: | |
ab22c1fa | 10763 | if (specs->saturating_p) |
dc491a25 ILT |
10764 | error_at (loc, |
10765 | ("both %<_Sat%> and %<int%> in " | |
10766 | "declaration specifiers")); | |
ab22c1fa | 10767 | else |
0b2c4be5 DS |
10768 | { |
10769 | specs->typespec_word = cts_int; | |
10770 | specs->locations[cdw_typespec] = loc; | |
10771 | } | |
98c3a782 JM |
10772 | return specs; |
10773 | case RID_FLOAT: | |
10774 | if (specs->long_p) | |
dc491a25 ILT |
10775 | error_at (loc, |
10776 | ("both %<long%> and %<float%> in " | |
10777 | "declaration specifiers")); | |
98c3a782 | 10778 | else if (specs->short_p) |
dc491a25 ILT |
10779 | error_at (loc, |
10780 | ("both %<short%> and %<float%> in " | |
10781 | "declaration specifiers")); | |
98c3a782 | 10782 | else if (specs->signed_p) |
dc491a25 ILT |
10783 | error_at (loc, |
10784 | ("both %<signed%> and %<float%> in " | |
10785 | "declaration specifiers")); | |
98c3a782 | 10786 | else if (specs->unsigned_p) |
dc491a25 ILT |
10787 | error_at (loc, |
10788 | ("both %<unsigned%> and %<float%> in " | |
10789 | "declaration specifiers")); | |
ab22c1fa | 10790 | else if (specs->saturating_p) |
dc491a25 ILT |
10791 | error_at (loc, |
10792 | ("both %<_Sat%> and %<float%> in " | |
10793 | "declaration specifiers")); | |
98c3a782 | 10794 | else |
0b2c4be5 DS |
10795 | { |
10796 | specs->typespec_word = cts_float; | |
10797 | specs->locations[cdw_typespec] = loc; | |
10798 | } | |
98c3a782 JM |
10799 | return specs; |
10800 | case RID_DOUBLE: | |
10801 | if (specs->long_long_p) | |
dc491a25 ILT |
10802 | error_at (loc, |
10803 | ("both %<long long%> and %<double%> in " | |
10804 | "declaration specifiers")); | |
98c3a782 | 10805 | else if (specs->short_p) |
dc491a25 ILT |
10806 | error_at (loc, |
10807 | ("both %<short%> and %<double%> in " | |
10808 | "declaration specifiers")); | |
98c3a782 | 10809 | else if (specs->signed_p) |
dc491a25 ILT |
10810 | error_at (loc, |
10811 | ("both %<signed%> and %<double%> in " | |
10812 | "declaration specifiers")); | |
98c3a782 | 10813 | else if (specs->unsigned_p) |
dc491a25 ILT |
10814 | error_at (loc, |
10815 | ("both %<unsigned%> and %<double%> in " | |
10816 | "declaration specifiers")); | |
ab22c1fa | 10817 | else if (specs->saturating_p) |
dc491a25 ILT |
10818 | error_at (loc, |
10819 | ("both %<_Sat%> and %<double%> in " | |
10820 | "declaration specifiers")); | |
98c3a782 | 10821 | else |
0b2c4be5 DS |
10822 | { |
10823 | specs->typespec_word = cts_double; | |
10824 | specs->locations[cdw_typespec] = loc; | |
10825 | } | |
98c3a782 | 10826 | return specs; |
c65699ef JM |
10827 | CASE_RID_FLOATN_NX: |
10828 | specs->floatn_nx_idx = i - RID_FLOATN_NX_FIRST; | |
10829 | if (!in_system_header_at (input_location)) | |
10830 | pedwarn (loc, OPT_Wpedantic, | |
10831 | "ISO C does not support the %<_Float%d%s%> type", | |
10832 | floatn_nx_types[specs->floatn_nx_idx].n, | |
10833 | (floatn_nx_types[specs->floatn_nx_idx].extended | |
10834 | ? "x" | |
10835 | : "")); | |
10836 | ||
10837 | if (specs->long_p) | |
10838 | error_at (loc, | |
10839 | ("both %<long%> and %<_Float%d%s%> in " | |
10840 | "declaration specifiers"), | |
10841 | floatn_nx_types[specs->floatn_nx_idx].n, | |
10842 | (floatn_nx_types[specs->floatn_nx_idx].extended | |
10843 | ? "x" | |
10844 | : "")); | |
10845 | else if (specs->short_p) | |
10846 | error_at (loc, | |
10847 | ("both %<short%> and %<_Float%d%s%> in " | |
10848 | "declaration specifiers"), | |
10849 | floatn_nx_types[specs->floatn_nx_idx].n, | |
10850 | (floatn_nx_types[specs->floatn_nx_idx].extended | |
10851 | ? "x" | |
10852 | : "")); | |
10853 | else if (specs->signed_p) | |
10854 | error_at (loc, | |
10855 | ("both %<signed%> and %<_Float%d%s%> in " | |
10856 | "declaration specifiers"), | |
10857 | floatn_nx_types[specs->floatn_nx_idx].n, | |
10858 | (floatn_nx_types[specs->floatn_nx_idx].extended | |
10859 | ? "x" | |
10860 | : "")); | |
10861 | else if (specs->unsigned_p) | |
10862 | error_at (loc, | |
10863 | ("both %<unsigned%> and %<_Float%d%s%> in " | |
10864 | "declaration specifiers"), | |
10865 | floatn_nx_types[specs->floatn_nx_idx].n, | |
10866 | (floatn_nx_types[specs->floatn_nx_idx].extended | |
10867 | ? "x" | |
10868 | : "")); | |
10869 | else if (specs->saturating_p) | |
10870 | error_at (loc, | |
10871 | ("both %<_Sat%> and %<_Float%d%s%> in " | |
10872 | "declaration specifiers"), | |
10873 | floatn_nx_types[specs->floatn_nx_idx].n, | |
10874 | (floatn_nx_types[specs->floatn_nx_idx].extended | |
10875 | ? "x" | |
10876 | : "")); | |
10877 | else if (FLOATN_NX_TYPE_NODE (specs->floatn_nx_idx) == NULL_TREE) | |
fe377a48 MP |
10878 | { |
10879 | specs->typespec_word = cts_floatn_nx; | |
10880 | error_at (loc, | |
10881 | "%<_Float%d%s%> is not supported on this target", | |
10882 | floatn_nx_types[specs->floatn_nx_idx].n, | |
10883 | (floatn_nx_types[specs->floatn_nx_idx].extended | |
10884 | ? "x" | |
10885 | : "")); | |
10886 | } | |
c65699ef JM |
10887 | else |
10888 | { | |
10889 | specs->typespec_word = cts_floatn_nx; | |
10890 | specs->locations[cdw_typespec] = loc; | |
10891 | } | |
10892 | return specs; | |
9a8ce21f JG |
10893 | case RID_DFLOAT32: |
10894 | case RID_DFLOAT64: | |
10895 | case RID_DFLOAT128: | |
b8698a0f | 10896 | { |
9a8ce21f JG |
10897 | const char *str; |
10898 | if (i == RID_DFLOAT32) | |
10899 | str = "_Decimal32"; | |
10900 | else if (i == RID_DFLOAT64) | |
10901 | str = "_Decimal64"; | |
10902 | else | |
10903 | str = "_Decimal128"; | |
10904 | if (specs->long_long_p) | |
dc491a25 | 10905 | error_at (loc, |
2f6f187a | 10906 | ("both %<long long%> and %qs in " |
dc491a25 ILT |
10907 | "declaration specifiers"), |
10908 | str); | |
9a8ce21f | 10909 | if (specs->long_p) |
dc491a25 | 10910 | error_at (loc, |
2f6f187a | 10911 | ("both %<long%> and %qs in " |
dc491a25 ILT |
10912 | "declaration specifiers"), |
10913 | str); | |
9a8ce21f | 10914 | else if (specs->short_p) |
dc491a25 | 10915 | error_at (loc, |
2f6f187a | 10916 | ("both %<short%> and %qs in " |
dc491a25 ILT |
10917 | "declaration specifiers"), |
10918 | str); | |
9a8ce21f | 10919 | else if (specs->signed_p) |
dc491a25 | 10920 | error_at (loc, |
2f6f187a | 10921 | ("both %<signed%> and %qs in " |
dc491a25 ILT |
10922 | "declaration specifiers"), |
10923 | str); | |
9a8ce21f | 10924 | else if (specs->unsigned_p) |
dc491a25 | 10925 | error_at (loc, |
2f6f187a | 10926 | ("both %<unsigned%> and %qs in " |
dc491a25 ILT |
10927 | "declaration specifiers"), |
10928 | str); | |
9a8ce21f | 10929 | else if (specs->complex_p) |
dc491a25 | 10930 | error_at (loc, |
2f6f187a | 10931 | ("both %<complex%> and %qs in " |
dc491a25 ILT |
10932 | "declaration specifiers"), |
10933 | str); | |
ab22c1fa | 10934 | else if (specs->saturating_p) |
dc491a25 | 10935 | error_at (loc, |
2f6f187a | 10936 | ("both %<_Sat%> and %qs in " |
dc491a25 ILT |
10937 | "declaration specifiers"), |
10938 | str); | |
9a8ce21f JG |
10939 | else if (i == RID_DFLOAT32) |
10940 | specs->typespec_word = cts_dfloat32; | |
10941 | else if (i == RID_DFLOAT64) | |
10942 | specs->typespec_word = cts_dfloat64; | |
10943 | else | |
10944 | specs->typespec_word = cts_dfloat128; | |
0b2c4be5 | 10945 | specs->locations[cdw_typespec] = loc; |
9a8ce21f JG |
10946 | } |
10947 | if (!targetm.decimal_float_supported_p ()) | |
dc491a25 | 10948 | error_at (loc, |
0ecf545c | 10949 | ("decimal floating-point not supported " |
dc491a25 | 10950 | "for this target")); |
c1771a20 | 10951 | pedwarn (loc, OPT_Wpedantic, |
0ecf545c | 10952 | "ISO C does not support decimal floating-point"); |
9a8ce21f | 10953 | return specs; |
ab22c1fa CF |
10954 | case RID_FRACT: |
10955 | case RID_ACCUM: | |
10956 | { | |
10957 | const char *str; | |
10958 | if (i == RID_FRACT) | |
10959 | str = "_Fract"; | |
10960 | else | |
10961 | str = "_Accum"; | |
10962 | if (specs->complex_p) | |
dc491a25 | 10963 | error_at (loc, |
2f6f187a | 10964 | ("both %<complex%> and %qs in " |
dc491a25 ILT |
10965 | "declaration specifiers"), |
10966 | str); | |
ab22c1fa CF |
10967 | else if (i == RID_FRACT) |
10968 | specs->typespec_word = cts_fract; | |
10969 | else | |
10970 | specs->typespec_word = cts_accum; | |
0b2c4be5 | 10971 | specs->locations[cdw_typespec] = loc; |
ab22c1fa CF |
10972 | } |
10973 | if (!targetm.fixed_point_supported_p ()) | |
dc491a25 ILT |
10974 | error_at (loc, |
10975 | "fixed-point types not supported for this target"); | |
c1771a20 | 10976 | pedwarn (loc, OPT_Wpedantic, |
fcf73884 | 10977 | "ISO C does not support fixed-point types"); |
ab22c1fa | 10978 | return specs; |
98c3a782 JM |
10979 | default: |
10980 | /* ObjC reserved word "id", handled below. */ | |
10981 | break; | |
10982 | } | |
10983 | } | |
deb176fa | 10984 | } |
98c3a782 JM |
10985 | |
10986 | /* Now we have a typedef (a TYPE_DECL node), an identifier (some | |
10987 | form of ObjC type, cases such as "int" and "long" being handled | |
10988 | above), a TYPE (struct, union, enum and typeof specifiers) or an | |
10989 | ERROR_MARK. In none of these cases may there have previously | |
10990 | been any type specifiers. */ | |
10991 | if (specs->type || specs->typespec_word != cts_none | |
10992 | || specs->long_p || specs->short_p || specs->signed_p | |
10993 | || specs->unsigned_p || specs->complex_p) | |
dc491a25 | 10994 | error_at (loc, "two or more data types in declaration specifiers"); |
deb176fa JM |
10995 | else if (TREE_CODE (type) == TYPE_DECL) |
10996 | { | |
10997 | if (TREE_TYPE (type) == error_mark_node) | |
10998 | ; /* Allow the type to default to int to avoid cascading errors. */ | |
10999 | else | |
11000 | { | |
11001 | specs->type = TREE_TYPE (type); | |
11002 | specs->decl_attr = DECL_ATTRIBUTES (type); | |
616aeba2 | 11003 | specs->typedef_p = true; |
98c3a782 | 11004 | specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type); |
0b2c4be5 | 11005 | specs->locations[cdw_typedef] = loc; |
dc491a25 ILT |
11006 | |
11007 | /* If this typedef name is defined in a struct, then a C++ | |
11008 | lookup would return a different value. */ | |
11009 | if (warn_cxx_compat | |
11010 | && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct) | |
11011 | warning_at (loc, OPT_Wc___compat, | |
11012 | "C++ lookup of %qD would return a field, not a type", | |
11013 | type); | |
11014 | ||
11015 | /* If we are parsing a struct, record that a struct field | |
11016 | used a typedef. */ | |
11017 | if (warn_cxx_compat && struct_parse_info != NULL) | |
9771b263 | 11018 | struct_parse_info->typedefs_seen.safe_push (type); |
deb176fa JM |
11019 | } |
11020 | } | |
deb176fa JM |
11021 | else if (TREE_CODE (type) == IDENTIFIER_NODE) |
11022 | { | |
11023 | tree t = lookup_name (type); | |
11024 | if (!t || TREE_CODE (t) != TYPE_DECL) | |
dc491a25 | 11025 | error_at (loc, "%qE fails to be a typedef or built in type", type); |
deb176fa JM |
11026 | else if (TREE_TYPE (t) == error_mark_node) |
11027 | ; | |
11028 | else | |
0b2c4be5 DS |
11029 | { |
11030 | specs->type = TREE_TYPE (t); | |
11031 | specs->locations[cdw_typespec] = loc; | |
11032 | } | |
deb176fa | 11033 | } |
29ce73cb | 11034 | else |
81da229b | 11035 | { |
29ce73cb | 11036 | if (TREE_CODE (type) != ERROR_MARK && spec.kind == ctsk_typeof) |
928c19bb JM |
11037 | { |
11038 | specs->typedef_p = true; | |
0b2c4be5 | 11039 | specs->locations[cdw_typedef] = loc; |
928c19bb JM |
11040 | if (spec.expr) |
11041 | { | |
11042 | if (specs->expr) | |
11043 | specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr), | |
11044 | specs->expr, spec.expr); | |
11045 | else | |
11046 | specs->expr = spec.expr; | |
11047 | specs->expr_const_operands &= spec.expr_const_operands; | |
11048 | } | |
11049 | } | |
81da229b JM |
11050 | specs->type = type; |
11051 | } | |
deb176fa JM |
11052 | |
11053 | return specs; | |
11054 | } | |
11055 | ||
11056 | /* Add the storage class specifier or function specifier SCSPEC to the | |
11057 | declaration specifiers SPECS, returning SPECS. */ | |
11058 | ||
11059 | struct c_declspecs * | |
620e594b | 11060 | declspecs_add_scspec (location_t loc, |
0b2c4be5 DS |
11061 | struct c_declspecs *specs, |
11062 | tree scspec) | |
deb176fa JM |
11063 | { |
11064 | enum rid i; | |
9a26d6ee JM |
11065 | enum c_storage_class n = csc_none; |
11066 | bool dupe = false; | |
27bf414c | 11067 | specs->declspecs_seen_p = true; |
deb176fa JM |
11068 | gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE |
11069 | && C_IS_RESERVED_WORD (scspec)); | |
11070 | i = C_RID_CODE (scspec); | |
b1ed4cb4 | 11071 | if (specs->non_sc_seen_p) |
b8698a0f | 11072 | warning (OPT_Wold_style_declaration, |
b1ed4cb4 | 11073 | "%qE is not at beginning of declaration", scspec); |
9a26d6ee JM |
11074 | switch (i) |
11075 | { | |
11076 | case RID_INLINE: | |
61f4f1cc JM |
11077 | /* C99 permits duplicate inline. Although of doubtful utility, |
11078 | it seems simplest to permit it in gnu89 mode as well, as | |
11079 | there is also little utility in maintaining this as a | |
11080 | difference between gnu89 and C99 inline. */ | |
11081 | dupe = false; | |
9a26d6ee | 11082 | specs->inline_p = true; |
0b2c4be5 | 11083 | specs->locations[cdw_inline] = loc; |
9a26d6ee | 11084 | break; |
bbceee64 JM |
11085 | case RID_NORETURN: |
11086 | /* Duplicate _Noreturn is permitted. */ | |
11087 | dupe = false; | |
11088 | specs->noreturn_p = true; | |
0b2c4be5 | 11089 | specs->locations[cdw_noreturn] = loc; |
bbceee64 | 11090 | break; |
9a26d6ee JM |
11091 | case RID_THREAD: |
11092 | dupe = specs->thread_p; | |
11093 | if (specs->storage_class == csc_auto) | |
582d9b50 | 11094 | error ("%qE used with %<auto%>", scspec); |
9a26d6ee | 11095 | else if (specs->storage_class == csc_register) |
582d9b50 | 11096 | error ("%qE used with %<register%>", scspec); |
9a26d6ee | 11097 | else if (specs->storage_class == csc_typedef) |
582d9b50 | 11098 | error ("%qE used with %<typedef%>", scspec); |
9a26d6ee | 11099 | else |
0b2c4be5 DS |
11100 | { |
11101 | specs->thread_p = true; | |
582d9b50 JM |
11102 | specs->thread_gnu_p = (strcmp (IDENTIFIER_POINTER (scspec), |
11103 | "__thread") == 0); | |
11104 | /* A diagnostic is not required for the use of this | |
11105 | identifier in the implementation namespace; only diagnose | |
11106 | it for the C11 spelling because of existing code using | |
11107 | the other spelling. */ | |
35aff4fb | 11108 | if (!specs->thread_gnu_p) |
582d9b50 JM |
11109 | { |
11110 | if (flag_isoc99) | |
35aff4fb MP |
11111 | pedwarn_c99 (loc, OPT_Wpedantic, |
11112 | "ISO C99 does not support %qE", scspec); | |
582d9b50 | 11113 | else |
35aff4fb MP |
11114 | pedwarn_c99 (loc, OPT_Wpedantic, |
11115 | "ISO C90 does not support %qE", scspec); | |
582d9b50 | 11116 | } |
0b2c4be5 DS |
11117 | specs->locations[cdw_thread] = loc; |
11118 | } | |
9a26d6ee JM |
11119 | break; |
11120 | case RID_AUTO: | |
11121 | n = csc_auto; | |
11122 | break; | |
11123 | case RID_EXTERN: | |
11124 | n = csc_extern; | |
11125 | /* Diagnose "__thread extern". */ | |
582d9b50 | 11126 | if (specs->thread_p && specs->thread_gnu_p) |
deb176fa | 11127 | error ("%<__thread%> before %<extern%>"); |
9a26d6ee JM |
11128 | break; |
11129 | case RID_REGISTER: | |
11130 | n = csc_register; | |
11131 | break; | |
11132 | case RID_STATIC: | |
11133 | n = csc_static; | |
11134 | /* Diagnose "__thread static". */ | |
582d9b50 | 11135 | if (specs->thread_p && specs->thread_gnu_p) |
deb176fa | 11136 | error ("%<__thread%> before %<static%>"); |
9a26d6ee JM |
11137 | break; |
11138 | case RID_TYPEDEF: | |
11139 | n = csc_typedef; | |
11140 | break; | |
11141 | default: | |
11142 | gcc_unreachable (); | |
11143 | } | |
11144 | if (n != csc_none && n == specs->storage_class) | |
11145 | dupe = true; | |
11146 | if (dupe) | |
582d9b50 JM |
11147 | { |
11148 | if (i == RID_THREAD) | |
11149 | error ("duplicate %<_Thread_local%> or %<__thread%>"); | |
11150 | else | |
11151 | error ("duplicate %qE", scspec); | |
11152 | } | |
9a26d6ee JM |
11153 | if (n != csc_none) |
11154 | { | |
11155 | if (specs->storage_class != csc_none && n != specs->storage_class) | |
11156 | { | |
11157 | error ("multiple storage classes in declaration specifiers"); | |
11158 | } | |
11159 | else | |
11160 | { | |
11161 | specs->storage_class = n; | |
0b2c4be5 | 11162 | specs->locations[cdw_storage_class] = loc; |
9a26d6ee JM |
11163 | if (n != csc_extern && n != csc_static && specs->thread_p) |
11164 | { | |
582d9b50 JM |
11165 | error ("%qs used with %qE", |
11166 | specs->thread_gnu_p ? "__thread" : "_Thread_local", | |
11167 | scspec); | |
9a26d6ee JM |
11168 | specs->thread_p = false; |
11169 | } | |
11170 | } | |
deb176fa | 11171 | } |
deb176fa JM |
11172 | return specs; |
11173 | } | |
11174 | ||
11175 | /* Add the attributes ATTRS to the declaration specifiers SPECS, | |
11176 | returning SPECS. */ | |
11177 | ||
11178 | struct c_declspecs * | |
620e594b | 11179 | declspecs_add_attrs (location_t loc, struct c_declspecs *specs, tree attrs) |
deb176fa JM |
11180 | { |
11181 | specs->attrs = chainon (attrs, specs->attrs); | |
0b2c4be5 | 11182 | specs->locations[cdw_attributes] = loc; |
27bf414c | 11183 | specs->declspecs_seen_p = true; |
deb176fa JM |
11184 | return specs; |
11185 | } | |
11186 | ||
d19fa6b5 JM |
11187 | /* Add an _Alignas specifier (expression ALIGN, or type whose |
11188 | alignment is ALIGN) to the declaration specifiers SPECS, returning | |
11189 | SPECS. */ | |
11190 | struct c_declspecs * | |
620e594b | 11191 | declspecs_add_alignas (location_t loc, |
0b2c4be5 | 11192 | struct c_declspecs *specs, tree align) |
d19fa6b5 | 11193 | { |
d19fa6b5 | 11194 | specs->alignas_p = true; |
0b2c4be5 | 11195 | specs->locations[cdw_alignas] = loc; |
d19fa6b5 JM |
11196 | if (align == error_mark_node) |
11197 | return specs; | |
673670da MS |
11198 | |
11199 | /* Only accept the alignment if it's valid and greater than | |
11200 | the current one. Zero is invalid but by C11 required to | |
11201 | be silently ignored. */ | |
11202 | int align_log = check_user_alignment (align, false, /* warn_zero = */false); | |
d19fa6b5 JM |
11203 | if (align_log > specs->align_log) |
11204 | specs->align_log = align_log; | |
11205 | return specs; | |
11206 | } | |
11207 | ||
98c3a782 JM |
11208 | /* Combine "long", "short", "signed", "unsigned" and "_Complex" type |
11209 | specifiers with any other type specifier to determine the resulting | |
11210 | type. This is where ISO C checks on complex types are made, since | |
11211 | "_Complex long" is a prefix of the valid ISO C type "_Complex long | |
11212 | double". */ | |
11213 | ||
11214 | struct c_declspecs * | |
11215 | finish_declspecs (struct c_declspecs *specs) | |
11216 | { | |
11217 | /* If a type was specified as a whole, we have no modifiers and are | |
11218 | done. */ | |
11219 | if (specs->type != NULL_TREE) | |
11220 | { | |
11221 | gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p | |
11222 | && !specs->signed_p && !specs->unsigned_p | |
11223 | && !specs->complex_p); | |
29ce73cb PB |
11224 | |
11225 | /* Set a dummy type. */ | |
11226 | if (TREE_CODE (specs->type) == ERROR_MARK) | |
11227 | specs->type = integer_type_node; | |
98c3a782 JM |
11228 | return specs; |
11229 | } | |
11230 | ||
11231 | /* If none of "void", "_Bool", "char", "int", "float" or "double" | |
11232 | has been specified, treat it as "int" unless "_Complex" is | |
11233 | present and there are no other specifiers. If we just have | |
11234 | "_Complex", it is equivalent to "_Complex double", but e.g. | |
11235 | "_Complex short" is equivalent to "_Complex short int". */ | |
11236 | if (specs->typespec_word == cts_none) | |
11237 | { | |
ab22c1fa | 11238 | if (specs->saturating_p) |
819fec00 | 11239 | { |
0b2c4be5 DS |
11240 | error_at (specs->locations[cdw_saturating], |
11241 | "%<_Sat%> is used without %<_Fract%> or %<_Accum%>"); | |
754ccf7c | 11242 | if (!targetm.fixed_point_supported_p ()) |
0b2c4be5 DS |
11243 | error_at (specs->locations[cdw_saturating], |
11244 | "fixed-point types not supported for this target"); | |
819fec00 NS |
11245 | specs->typespec_word = cts_fract; |
11246 | } | |
11247 | else if (specs->long_p || specs->short_p | |
11248 | || specs->signed_p || specs->unsigned_p) | |
98c3a782 JM |
11249 | { |
11250 | specs->typespec_word = cts_int; | |
11251 | } | |
11252 | else if (specs->complex_p) | |
11253 | { | |
11254 | specs->typespec_word = cts_double; | |
0b2c4be5 | 11255 | pedwarn (specs->locations[cdw_complex], OPT_Wpedantic, |
fcf73884 MLI |
11256 | "ISO C does not support plain %<complex%> meaning " |
11257 | "%<double complex%>"); | |
98c3a782 JM |
11258 | } |
11259 | else | |
11260 | { | |
11261 | specs->typespec_word = cts_int; | |
11262 | specs->default_int_p = true; | |
11263 | /* We don't diagnose this here because grokdeclarator will | |
11264 | give more specific diagnostics according to whether it is | |
11265 | a function definition. */ | |
11266 | } | |
11267 | } | |
11268 | ||
11269 | /* If "signed" was specified, record this to distinguish "int" and | |
11270 | "signed int" in the case of a bit-field with | |
11271 | -funsigned-bitfields. */ | |
11272 | specs->explicit_signed_p = specs->signed_p; | |
11273 | ||
11274 | /* Now compute the actual type. */ | |
11275 | switch (specs->typespec_word) | |
11276 | { | |
38b7bc7f JM |
11277 | case cts_auto_type: |
11278 | gcc_assert (!specs->long_p && !specs->short_p | |
11279 | && !specs->signed_p && !specs->unsigned_p | |
11280 | && !specs->complex_p); | |
11281 | /* Type to be filled in later. */ | |
11282 | break; | |
98c3a782 JM |
11283 | case cts_void: |
11284 | gcc_assert (!specs->long_p && !specs->short_p | |
11285 | && !specs->signed_p && !specs->unsigned_p | |
11286 | && !specs->complex_p); | |
11287 | specs->type = void_type_node; | |
11288 | break; | |
11289 | case cts_bool: | |
11290 | gcc_assert (!specs->long_p && !specs->short_p | |
11291 | && !specs->signed_p && !specs->unsigned_p | |
11292 | && !specs->complex_p); | |
11293 | specs->type = boolean_type_node; | |
11294 | break; | |
11295 | case cts_char: | |
11296 | gcc_assert (!specs->long_p && !specs->short_p); | |
11297 | gcc_assert (!(specs->signed_p && specs->unsigned_p)); | |
11298 | if (specs->signed_p) | |
11299 | specs->type = signed_char_type_node; | |
11300 | else if (specs->unsigned_p) | |
11301 | specs->type = unsigned_char_type_node; | |
11302 | else | |
11303 | specs->type = char_type_node; | |
11304 | if (specs->complex_p) | |
11305 | { | |
0b2c4be5 | 11306 | pedwarn (specs->locations[cdw_complex], OPT_Wpedantic, |
fcf73884 | 11307 | "ISO C does not support complex integer types"); |
98c3a782 JM |
11308 | specs->type = build_complex_type (specs->type); |
11309 | } | |
11310 | break; | |
78a7c317 | 11311 | case cts_int_n: |
a6766312 KT |
11312 | gcc_assert (!specs->long_p && !specs->short_p && !specs->long_long_p); |
11313 | gcc_assert (!(specs->signed_p && specs->unsigned_p)); | |
666f7903 JJ |
11314 | if (! int_n_enabled_p[specs->int_n_idx]) |
11315 | specs->type = integer_type_node; | |
11316 | else | |
11317 | specs->type = (specs->unsigned_p | |
11318 | ? int_n_trees[specs->int_n_idx].unsigned_type | |
11319 | : int_n_trees[specs->int_n_idx].signed_type); | |
a6766312 KT |
11320 | if (specs->complex_p) |
11321 | { | |
0b2c4be5 | 11322 | pedwarn (specs->locations[cdw_complex], OPT_Wpedantic, |
a6766312 KT |
11323 | "ISO C does not support complex integer types"); |
11324 | specs->type = build_complex_type (specs->type); | |
11325 | } | |
11326 | break; | |
98c3a782 JM |
11327 | case cts_int: |
11328 | gcc_assert (!(specs->long_p && specs->short_p)); | |
11329 | gcc_assert (!(specs->signed_p && specs->unsigned_p)); | |
11330 | if (specs->long_long_p) | |
11331 | specs->type = (specs->unsigned_p | |
11332 | ? long_long_unsigned_type_node | |
11333 | : long_long_integer_type_node); | |
11334 | else if (specs->long_p) | |
11335 | specs->type = (specs->unsigned_p | |
11336 | ? long_unsigned_type_node | |
11337 | : long_integer_type_node); | |
11338 | else if (specs->short_p) | |
11339 | specs->type = (specs->unsigned_p | |
11340 | ? short_unsigned_type_node | |
11341 | : short_integer_type_node); | |
11342 | else | |
11343 | specs->type = (specs->unsigned_p | |
11344 | ? unsigned_type_node | |
11345 | : integer_type_node); | |
11346 | if (specs->complex_p) | |
11347 | { | |
0b2c4be5 | 11348 | pedwarn (specs->locations[cdw_complex], OPT_Wpedantic, |
fcf73884 | 11349 | "ISO C does not support complex integer types"); |
98c3a782 JM |
11350 | specs->type = build_complex_type (specs->type); |
11351 | } | |
11352 | break; | |
11353 | case cts_float: | |
11354 | gcc_assert (!specs->long_p && !specs->short_p | |
11355 | && !specs->signed_p && !specs->unsigned_p); | |
11356 | specs->type = (specs->complex_p | |
11357 | ? complex_float_type_node | |
11358 | : float_type_node); | |
11359 | break; | |
11360 | case cts_double: | |
11361 | gcc_assert (!specs->long_long_p && !specs->short_p | |
11362 | && !specs->signed_p && !specs->unsigned_p); | |
11363 | if (specs->long_p) | |
11364 | { | |
11365 | specs->type = (specs->complex_p | |
11366 | ? complex_long_double_type_node | |
11367 | : long_double_type_node); | |
11368 | } | |
11369 | else | |
11370 | { | |
11371 | specs->type = (specs->complex_p | |
11372 | ? complex_double_type_node | |
11373 | : double_type_node); | |
11374 | } | |
11375 | break; | |
c65699ef JM |
11376 | case cts_floatn_nx: |
11377 | gcc_assert (!specs->long_p && !specs->short_p | |
11378 | && !specs->signed_p && !specs->unsigned_p); | |
fe377a48 MP |
11379 | if (FLOATN_NX_TYPE_NODE (specs->floatn_nx_idx) == NULL_TREE) |
11380 | specs->type = integer_type_node; | |
11381 | else if (specs->complex_p) | |
11382 | specs->type = COMPLEX_FLOATN_NX_TYPE_NODE (specs->floatn_nx_idx); | |
11383 | else | |
11384 | specs->type = FLOATN_NX_TYPE_NODE (specs->floatn_nx_idx); | |
c65699ef | 11385 | break; |
9a8ce21f JG |
11386 | case cts_dfloat32: |
11387 | case cts_dfloat64: | |
11388 | case cts_dfloat128: | |
11389 | gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p | |
11390 | && !specs->signed_p && !specs->unsigned_p && !specs->complex_p); | |
11391 | if (specs->typespec_word == cts_dfloat32) | |
11392 | specs->type = dfloat32_type_node; | |
11393 | else if (specs->typespec_word == cts_dfloat64) | |
11394 | specs->type = dfloat64_type_node; | |
11395 | else | |
11396 | specs->type = dfloat128_type_node; | |
11397 | break; | |
ab22c1fa | 11398 | case cts_fract: |
754ccf7c JJ |
11399 | gcc_assert (!specs->complex_p); |
11400 | if (!targetm.fixed_point_supported_p ()) | |
11401 | specs->type = integer_type_node; | |
11402 | else if (specs->saturating_p) | |
ab22c1fa CF |
11403 | { |
11404 | if (specs->long_long_p) | |
11405 | specs->type = specs->unsigned_p | |
11406 | ? sat_unsigned_long_long_fract_type_node | |
11407 | : sat_long_long_fract_type_node; | |
11408 | else if (specs->long_p) | |
11409 | specs->type = specs->unsigned_p | |
11410 | ? sat_unsigned_long_fract_type_node | |
11411 | : sat_long_fract_type_node; | |
11412 | else if (specs->short_p) | |
11413 | specs->type = specs->unsigned_p | |
11414 | ? sat_unsigned_short_fract_type_node | |
11415 | : sat_short_fract_type_node; | |
11416 | else | |
11417 | specs->type = specs->unsigned_p | |
11418 | ? sat_unsigned_fract_type_node | |
11419 | : sat_fract_type_node; | |
754ccf7c | 11420 | } |
ab22c1fa CF |
11421 | else |
11422 | { | |
11423 | if (specs->long_long_p) | |
11424 | specs->type = specs->unsigned_p | |
11425 | ? unsigned_long_long_fract_type_node | |
11426 | : long_long_fract_type_node; | |
11427 | else if (specs->long_p) | |
11428 | specs->type = specs->unsigned_p | |
11429 | ? unsigned_long_fract_type_node | |
11430 | : long_fract_type_node; | |
11431 | else if (specs->short_p) | |
11432 | specs->type = specs->unsigned_p | |
11433 | ? unsigned_short_fract_type_node | |
11434 | : short_fract_type_node; | |
11435 | else | |
11436 | specs->type = specs->unsigned_p | |
11437 | ? unsigned_fract_type_node | |
11438 | : fract_type_node; | |
754ccf7c | 11439 | } |
ab22c1fa CF |
11440 | break; |
11441 | case cts_accum: | |
754ccf7c JJ |
11442 | gcc_assert (!specs->complex_p); |
11443 | if (!targetm.fixed_point_supported_p ()) | |
11444 | specs->type = integer_type_node; | |
11445 | else if (specs->saturating_p) | |
ab22c1fa CF |
11446 | { |
11447 | if (specs->long_long_p) | |
11448 | specs->type = specs->unsigned_p | |
11449 | ? sat_unsigned_long_long_accum_type_node | |
11450 | : sat_long_long_accum_type_node; | |
11451 | else if (specs->long_p) | |
11452 | specs->type = specs->unsigned_p | |
11453 | ? sat_unsigned_long_accum_type_node | |
11454 | : sat_long_accum_type_node; | |
11455 | else if (specs->short_p) | |
11456 | specs->type = specs->unsigned_p | |
11457 | ? sat_unsigned_short_accum_type_node | |
11458 | : sat_short_accum_type_node; | |
11459 | else | |
11460 | specs->type = specs->unsigned_p | |
11461 | ? sat_unsigned_accum_type_node | |
11462 | : sat_accum_type_node; | |
754ccf7c | 11463 | } |
ab22c1fa CF |
11464 | else |
11465 | { | |
11466 | if (specs->long_long_p) | |
11467 | specs->type = specs->unsigned_p | |
11468 | ? unsigned_long_long_accum_type_node | |
11469 | : long_long_accum_type_node; | |
11470 | else if (specs->long_p) | |
11471 | specs->type = specs->unsigned_p | |
11472 | ? unsigned_long_accum_type_node | |
11473 | : long_accum_type_node; | |
11474 | else if (specs->short_p) | |
11475 | specs->type = specs->unsigned_p | |
11476 | ? unsigned_short_accum_type_node | |
11477 | : short_accum_type_node; | |
11478 | else | |
11479 | specs->type = specs->unsigned_p | |
11480 | ? unsigned_accum_type_node | |
11481 | : accum_type_node; | |
754ccf7c | 11482 | } |
ab22c1fa | 11483 | break; |
98c3a782 JM |
11484 | default: |
11485 | gcc_unreachable (); | |
11486 | } | |
11487 | ||
11488 | return specs; | |
11489 | } | |
11490 | ||
d7438551 AH |
11491 | /* Perform final processing on one file scope's declarations (or the |
11492 | external scope's declarations), GLOBALS. */ | |
db5f8b93 | 11493 | |
f75fbaf7 ZW |
11494 | static void |
11495 | c_write_global_declarations_1 (tree globals) | |
d1bd0ded | 11496 | { |
d1bd0ded | 11497 | tree decl; |
df4b9cfe | 11498 | bool reconsider; |
118a3a8b | 11499 | |
f75fbaf7 | 11500 | /* Process the decls in the order they were written. */ |
910ad8de | 11501 | for (decl = globals; decl; decl = DECL_CHAIN (decl)) |
bc4b653b | 11502 | { |
bc4b653b JM |
11503 | /* Check for used but undefined static functions using the C |
11504 | standard's definition of "used", and set TREE_NO_WARNING so | |
d7438551 | 11505 | that check_global_declaration doesn't repeat the check. */ |
bc4b653b | 11506 | if (TREE_CODE (decl) == FUNCTION_DECL |
3fa8871b | 11507 | && DECL_INITIAL (decl) == NULL_TREE |
bc4b653b | 11508 | && DECL_EXTERNAL (decl) |
cbdd8ae0 | 11509 | && !TREE_PUBLIC (decl)) |
bc4b653b | 11510 | { |
cbdd8ae0 JJ |
11511 | if (C_DECL_USED (decl)) |
11512 | { | |
1db01ff9 JJ |
11513 | if (pedwarn (input_location, 0, "%q+F used but never defined", |
11514 | decl)) | |
11515 | TREE_NO_WARNING (decl) = 1; | |
cbdd8ae0 JJ |
11516 | } |
11517 | /* For -Wunused-function warn about unused static prototypes. */ | |
11518 | else if (warn_unused_function | |
11519 | && ! DECL_ARTIFICIAL (decl) | |
11520 | && ! TREE_NO_WARNING (decl)) | |
11521 | { | |
1db01ff9 JJ |
11522 | if (warning (OPT_Wunused_function, |
11523 | "%q+F declared %<static%> but never defined", | |
11524 | decl)) | |
11525 | TREE_NO_WARNING (decl) = 1; | |
cbdd8ae0 | 11526 | } |
bc4b653b | 11527 | } |
db5f8b93 RH |
11528 | |
11529 | wrapup_global_declaration_1 (decl); | |
bc4b653b | 11530 | } |
df4b9cfe JJ |
11531 | |
11532 | do | |
11533 | { | |
11534 | reconsider = false; | |
910ad8de | 11535 | for (decl = globals; decl; decl = DECL_CHAIN (decl)) |
df4b9cfe JJ |
11536 | reconsider |= wrapup_global_declaration_2 (decl); |
11537 | } | |
11538 | while (reconsider); | |
d1bd0ded GK |
11539 | } |
11540 | ||
9cc54940 AC |
11541 | /* Callback to collect a source_ref from a DECL. */ |
11542 | ||
11543 | static void | |
11544 | collect_source_ref_cb (tree decl) | |
11545 | { | |
11546 | if (!DECL_IS_BUILTIN (decl)) | |
11547 | collect_source_ref (LOCATION_FILE (decl_sloc (decl, false))); | |
11548 | } | |
11549 | ||
86d71fca AC |
11550 | /* Preserve the external declarations scope across a garbage collect. */ |
11551 | static GTY(()) tree ext_block; | |
11552 | ||
9cc54940 AC |
11553 | /* Collect all references relevant to SOURCE_FILE. */ |
11554 | ||
11555 | static void | |
11556 | collect_all_refs (const char *source_file) | |
11557 | { | |
11558 | tree t; | |
6be14c0e | 11559 | unsigned i; |
9cc54940 | 11560 | |
9771b263 | 11561 | FOR_EACH_VEC_ELT (*all_translation_units, i, t) |
9cc54940 | 11562 | collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t)), source_file); |
86d71fca AC |
11563 | |
11564 | collect_ada_nodes (BLOCK_VARS (ext_block), source_file); | |
9cc54940 AC |
11565 | } |
11566 | ||
11567 | /* Iterate over all global declarations and call CALLBACK. */ | |
11568 | ||
11569 | static void | |
11570 | for_each_global_decl (void (*callback) (tree decl)) | |
11571 | { | |
11572 | tree t; | |
11573 | tree decls; | |
11574 | tree decl; | |
6be14c0e | 11575 | unsigned i; |
9cc54940 | 11576 | |
9771b263 | 11577 | FOR_EACH_VEC_ELT (*all_translation_units, i, t) |
9cc54940 AC |
11578 | { |
11579 | decls = DECL_INITIAL (t); | |
11580 | for (decl = BLOCK_VARS (decls); decl; decl = TREE_CHAIN (decl)) | |
11581 | callback (decl); | |
11582 | } | |
9cc54940 | 11583 | |
86d71fca AC |
11584 | for (decl = BLOCK_VARS (ext_block); decl; decl = TREE_CHAIN (decl)) |
11585 | callback (decl); | |
11586 | } | |
db5f8b93 | 11587 | |
d7438551 AH |
11588 | /* Perform any final parser cleanups and generate initial debugging |
11589 | information. */ | |
11590 | ||
d1bd0ded | 11591 | void |
d7438551 | 11592 | c_parse_final_cleanups (void) |
d1bd0ded | 11593 | { |
db5f8b93 | 11594 | tree t; |
6be14c0e | 11595 | unsigned i; |
e13e48e7 | 11596 | |
f75fbaf7 ZW |
11597 | /* We don't want to do this if generating a PCH. */ |
11598 | if (pch_file) | |
11599 | return; | |
d1bd0ded | 11600 | |
d7438551 | 11601 | timevar_stop (TV_PHASE_PARSING); |
575bfb00 LC |
11602 | timevar_start (TV_PHASE_DEFERRED); |
11603 | ||
977e30bc NP |
11604 | /* Do the Objective-C stuff. This is where all the Objective-C |
11605 | module stuff gets generated (symtab, class/protocol/selector | |
11606 | lists etc). */ | |
11607 | if (c_dialect_objc ()) | |
11608 | objc_write_global_declarations (); | |
11609 | ||
36c1b0de ZW |
11610 | /* Close the external scope. */ |
11611 | ext_block = pop_scope (); | |
11612 | external_scope = 0; | |
366de0ce | 11613 | gcc_assert (!current_scope); |
36c1b0de | 11614 | |
9cc54940 | 11615 | /* Handle -fdump-ada-spec[-slim]. */ |
3b78de56 | 11616 | if (flag_dump_ada_spec || flag_dump_ada_spec_slim) |
9cc54940 AC |
11617 | { |
11618 | /* Build a table of files to generate specs for */ | |
3b78de56 | 11619 | if (flag_dump_ada_spec_slim) |
9cc54940 AC |
11620 | collect_source_ref (main_input_filename); |
11621 | else | |
11622 | for_each_global_decl (collect_source_ref_cb); | |
11623 | ||
11624 | dump_ada_specs (collect_all_refs, NULL); | |
11625 | } | |
11626 | ||
db5f8b93 | 11627 | /* Process all file scopes in this compilation, and the external_scope, |
d7438551 | 11628 | through wrapup_global_declarations. */ |
9771b263 | 11629 | FOR_EACH_VEC_ELT (*all_translation_units, i, t) |
db5f8b93 | 11630 | c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t))); |
36c1b0de ZW |
11631 | c_write_global_declarations_1 (BLOCK_VARS (ext_block)); |
11632 | ||
575bfb00 | 11633 | timevar_stop (TV_PHASE_DEFERRED); |
d7438551 | 11634 | timevar_start (TV_PHASE_PARSING); |
db5f8b93 RH |
11635 | |
11636 | ext_block = NULL; | |
d1bd0ded GK |
11637 | } |
11638 | ||
bffad7f1 SB |
11639 | /* Register reserved keyword WORD as qualifier for address space AS. */ |
11640 | ||
11641 | void | |
11642 | c_register_addr_space (const char *word, addr_space_t as) | |
11643 | { | |
11644 | int rid = RID_FIRST_ADDR_SPACE + as; | |
11645 | tree id; | |
11646 | ||
11647 | /* Address space qualifiers are only supported | |
11648 | in C with GNU extensions enabled. */ | |
11649 | if (c_dialect_objc () || flag_no_asm) | |
11650 | return; | |
11651 | ||
11652 | id = get_identifier (word); | |
11653 | C_SET_RID_CODE (id, rid); | |
11654 | C_IS_RESERVED_WORD (id) = 1; | |
11655 | ridpointers [rid] = id; | |
11656 | } | |
11657 | ||
acf0174b JJ |
11658 | /* Return identifier to look up for omp declare reduction. */ |
11659 | ||
11660 | tree | |
11661 | c_omp_reduction_id (enum tree_code reduction_code, tree reduction_id) | |
11662 | { | |
11663 | const char *p = NULL; | |
11664 | switch (reduction_code) | |
11665 | { | |
11666 | case PLUS_EXPR: p = "+"; break; | |
11667 | case MULT_EXPR: p = "*"; break; | |
11668 | case MINUS_EXPR: p = "-"; break; | |
11669 | case BIT_AND_EXPR: p = "&"; break; | |
11670 | case BIT_XOR_EXPR: p = "^"; break; | |
11671 | case BIT_IOR_EXPR: p = "|"; break; | |
11672 | case TRUTH_ANDIF_EXPR: p = "&&"; break; | |
11673 | case TRUTH_ORIF_EXPR: p = "||"; break; | |
11674 | case MIN_EXPR: p = "min"; break; | |
11675 | case MAX_EXPR: p = "max"; break; | |
11676 | default: | |
11677 | break; | |
11678 | } | |
11679 | ||
11680 | if (p == NULL) | |
11681 | { | |
11682 | if (TREE_CODE (reduction_id) != IDENTIFIER_NODE) | |
11683 | return error_mark_node; | |
11684 | p = IDENTIFIER_POINTER (reduction_id); | |
11685 | } | |
11686 | ||
11687 | const char prefix[] = "omp declare reduction "; | |
11688 | size_t lenp = sizeof (prefix); | |
11689 | size_t len = strlen (p); | |
11690 | char *name = XALLOCAVEC (char, lenp + len); | |
11691 | memcpy (name, prefix, lenp - 1); | |
11692 | memcpy (name + lenp - 1, p, len + 1); | |
11693 | return get_identifier (name); | |
11694 | } | |
11695 | ||
11696 | /* Lookup REDUCTION_ID in the current scope, or create an artificial | |
11697 | VAR_DECL, bind it into the current scope and return it. */ | |
11698 | ||
11699 | tree | |
11700 | c_omp_reduction_decl (tree reduction_id) | |
11701 | { | |
11702 | struct c_binding *b = I_SYMBOL_BINDING (reduction_id); | |
11703 | if (b != NULL && B_IN_CURRENT_SCOPE (b)) | |
11704 | return b->decl; | |
11705 | ||
11706 | tree decl = build_decl (BUILTINS_LOCATION, VAR_DECL, | |
11707 | reduction_id, integer_type_node); | |
11708 | DECL_ARTIFICIAL (decl) = 1; | |
11709 | DECL_EXTERNAL (decl) = 1; | |
11710 | TREE_STATIC (decl) = 1; | |
11711 | TREE_PUBLIC (decl) = 0; | |
11712 | bind (reduction_id, decl, current_scope, true, false, BUILTINS_LOCATION); | |
11713 | return decl; | |
11714 | } | |
11715 | ||
11716 | /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */ | |
11717 | ||
11718 | tree | |
11719 | c_omp_reduction_lookup (tree reduction_id, tree type) | |
11720 | { | |
11721 | struct c_binding *b = I_SYMBOL_BINDING (reduction_id); | |
11722 | while (b) | |
11723 | { | |
11724 | tree t; | |
11725 | for (t = DECL_INITIAL (b->decl); t; t = TREE_CHAIN (t)) | |
11726 | if (comptypes (TREE_PURPOSE (t), type)) | |
11727 | return TREE_VALUE (t); | |
11728 | b = b->shadowed; | |
11729 | } | |
11730 | return error_mark_node; | |
11731 | } | |
11732 | ||
11733 | /* Helper function called via walk_tree, to diagnose invalid | |
11734 | #pragma omp declare reduction combiners or initializers. */ | |
11735 | ||
11736 | tree | |
11737 | c_check_omp_declare_reduction_r (tree *tp, int *, void *data) | |
11738 | { | |
11739 | tree *vars = (tree *) data; | |
11740 | if (SSA_VAR_P (*tp) | |
11741 | && !DECL_ARTIFICIAL (*tp) | |
11742 | && *tp != vars[0] | |
11743 | && *tp != vars[1]) | |
11744 | { | |
11745 | location_t loc = DECL_SOURCE_LOCATION (vars[0]); | |
11746 | if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars[0])), "omp_out") == 0) | |
11747 | error_at (loc, "%<#pragma omp declare reduction%> combiner refers to " | |
11748 | "variable %qD which is not %<omp_out%> nor %<omp_in%>", | |
11749 | *tp); | |
11750 | else | |
11751 | error_at (loc, "%<#pragma omp declare reduction%> initializer refers " | |
11752 | "to variable %qD which is not %<omp_priv%> nor " | |
11753 | "%<omp_orig%>", | |
11754 | *tp); | |
11755 | return *tp; | |
11756 | } | |
11757 | return NULL_TREE; | |
11758 | } | |
11759 | ||
d4a10d0a | 11760 | #include "gt-c-c-decl.h" |