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51ef3909 | 1 | /* Process declarations and variables for C compiler. |
3aea1f79 | 2 | Copyright (C) 1988-2014 Free Software Foundation, Inc. |
51ef3909 | 3 | |
f12b58b3 | 4 | This file is part of GCC. |
51ef3909 | 5 | |
f12b58b3 | 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 | |
8c4c00c1 | 8 | Software Foundation; either version 3, or (at your option) any later |
f12b58b3 | 9 | version. |
51ef3909 | 10 | |
f12b58b3 | 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. | |
51ef3909 | 15 | |
16 | You should have received a copy of the GNU General Public License | |
8c4c00c1 | 17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
51ef3909 | 19 | |
51ef3909 | 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" | |
405711de | 28 | #include "system.h" |
805e22b2 | 29 | #include "coretypes.h" |
ba821eb1 | 30 | #include "input.h" |
805e22b2 | 31 | #include "tm.h" |
6e6e5faa | 32 | #include "intl.h" |
51ef3909 | 33 | #include "tree.h" |
9ed99284 | 34 | #include "print-tree.h" |
35 | #include "stor-layout.h" | |
36 | #include "varasm.h" | |
37 | #include "attribs.h" | |
38 | #include "stringpool.h" | |
e619d7b1 | 39 | #include "tree-inline.h" |
51ef3909 | 40 | #include "flags.h" |
0a893c29 | 41 | #include "function.h" |
51ef3909 | 42 | #include "c-tree.h" |
9cdfa0b0 | 43 | #include "toplev.h" |
61788791 | 44 | #include "tm_p.h" |
11ce684d | 45 | #include "cpplib.h" |
a767736d | 46 | #include "target.h" |
b29760a8 | 47 | #include "debug.h" |
dcfa26d9 | 48 | #include "opts.h" |
9645fa4f | 49 | #include "timevar.h" |
7bedc3a0 | 50 | #include "c-family/c-common.h" |
6c536c4f | 51 | #include "c-family/c-objc.h" |
7bedc3a0 | 52 | #include "c-family/c-pragma.h" |
2c4c3477 | 53 | #include "c-family/c-ubsan.h" |
874993a5 | 54 | #include "c-lang.h" |
4ee9c684 | 55 | #include "langhooks.h" |
75a70cf9 | 56 | #include "tree-iterator.h" |
852f689e | 57 | #include "diagnostic-core.h" |
b9ed1410 | 58 | #include "dumpfile.h" |
ae01b312 | 59 | #include "cgraph.h" |
d1455aa3 | 60 | #include "hash-table.h" |
43085570 | 61 | #include "langhooks-def.h" |
431205b7 | 62 | #include "hash-set.h" |
9227b6fc | 63 | #include "plugin.h" |
7bedc3a0 | 64 | #include "c-family/c-ada-spec.h" |
d037099f | 65 | #include "cilk.h" |
f7715905 | 66 | #include "builtins.h" |
11ce684d | 67 | |
51ef3909 | 68 | /* In grokdeclarator, distinguish syntactic contexts of declarators. */ |
69 | enum decl_context | |
70 | { NORMAL, /* Ordinary declaration */ | |
71 | FUNCDEF, /* Function definition */ | |
72 | PARM, /* Declaration of parm before function body */ | |
73 | FIELD, /* Declaration inside struct or union */ | |
51ef3909 | 74 | TYPENAME}; /* Typename (inside cast or sizeof) */ |
75 | ||
81f218ec | 76 | /* States indicating how grokdeclarator() should handle declspecs marked |
77 | with __attribute__((deprecated)). An object declared as | |
78 | __attribute__((deprecated)) suppresses warnings of uses of other | |
79 | deprecated items. */ | |
80 | ||
81 | enum deprecated_states { | |
82 | DEPRECATED_NORMAL, | |
83 | DEPRECATED_SUPPRESS | |
84 | }; | |
85 | ||
51ef3909 | 86 | \f |
51ef3909 | 87 | /* Nonzero if we have seen an invalid cross reference |
88 | to a struct, union, or enum, but not yet printed the message. */ | |
51ef3909 | 89 | tree pending_invalid_xref; |
e24e8df7 | 90 | |
51ef3909 | 91 | /* File and line to appear in the eventual error message. */ |
bca5a169 | 92 | location_t pending_invalid_xref_location; |
51ef3909 | 93 | |
a89ce285 | 94 | /* The file and line that the prototype came from if this is an |
95 | old-style definition; used for diagnostics in | |
96 | store_parm_decls_oldstyle. */ | |
2b652cf3 | 97 | |
46f9c5ec | 98 | static location_t current_function_prototype_locus; |
06460bd1 | 99 | |
3eafcdb5 | 100 | /* Whether this prototype was built-in. */ |
101 | ||
102 | static bool current_function_prototype_built_in; | |
103 | ||
104 | /* The argument type information of this prototype. */ | |
105 | ||
106 | static tree current_function_prototype_arg_types; | |
107 | ||
731e6cbf | 108 | /* The argument information structure for the function currently being |
109 | defined. */ | |
110 | ||
ac206aff | 111 | static struct c_arg_info *current_function_arg_info; |
731e6cbf | 112 | |
9823d3a9 | 113 | /* The obstack on which parser and related data structures, which are |
114 | not live beyond their top-level declaration or definition, are | |
115 | allocated. */ | |
116 | struct obstack parser_obstack; | |
117 | ||
e41f0d80 | 118 | /* The current statement tree. */ |
119 | ||
1f3233d1 | 120 | static GTY(()) struct stmt_tree_s c_stmt_tree; |
e41f0d80 | 121 | |
8b332087 | 122 | /* State saving variables. */ |
0375a275 | 123 | tree c_break_label; |
124 | tree c_cont_label; | |
d9cf68bf | 125 | |
393b349a | 126 | /* A list of decls to be made automatically visible in each file scope. */ |
127 | static GTY(()) tree visible_builtins; | |
128 | ||
51ef3909 | 129 | /* Set to 0 at beginning of a function definition, set to 1 if |
130 | a return statement that specifies a return value is seen. */ | |
131 | ||
132 | int current_function_returns_value; | |
133 | ||
134 | /* Set to 0 at beginning of a function definition, set to 1 if | |
135 | a return statement with no argument is seen. */ | |
136 | ||
137 | int current_function_returns_null; | |
138 | ||
af857942 | 139 | /* Set to 0 at beginning of a function definition, set to 1 if |
140 | a call to a noreturn function is seen. */ | |
141 | ||
142 | int current_function_returns_abnormally; | |
143 | ||
51ef3909 | 144 | /* Set to nonzero by `grokdeclarator' for a function |
145 | whose return type is defaulted, if warnings for this are desired. */ | |
146 | ||
147 | static int warn_about_return_type; | |
148 | ||
8a1f0315 | 149 | /* Nonzero when the current toplevel function contains a declaration |
150 | of a nested function which is never defined. */ | |
151 | ||
152 | static bool undef_nested_function; | |
153 | ||
7714837c | 154 | /* Mode used to build pointers (VOIDmode means ptr_mode). */ |
155 | ||
156 | enum machine_mode c_default_pointer_mode = VOIDmode; | |
157 | ||
bc7bff74 | 158 | /* If non-zero, implicit "omp declare target" attribute is added into the |
159 | attribute lists. */ | |
160 | int current_omp_declare_target_attribute; | |
51ef3909 | 161 | \f |
393b349a | 162 | /* Each c_binding structure describes one binding of an identifier to |
163 | a decl. All the decls in a scope - irrespective of namespace - are | |
164 | chained together by the ->prev field, which (as the name implies) | |
165 | runs in reverse order. All the decls in a given namespace bound to | |
166 | a given identifier are chained by the ->shadowed field, which runs | |
4194491a | 167 | from inner to outer scopes. |
393b349a | 168 | |
169 | The ->decl field usually points to a DECL node, but there are two | |
170 | exceptions. In the namespace of type tags, the bound entity is a | |
171 | RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared | |
172 | identifier is encountered, it is bound to error_mark_node to | |
173 | suppress further errors about that identifier in the current | |
4194491a | 174 | function. |
175 | ||
f805d53d | 176 | The ->u.type field stores the type of the declaration in this scope; |
606a02e3 | 177 | if NULL, the type is the type of the ->decl field. This is only of |
178 | relevance for objects with external or internal linkage which may | |
179 | be redeclared in inner scopes, forming composite types that only | |
180 | persist for the duration of those scopes. In the external scope, | |
181 | this stores the composite of all the types declared for this | |
182 | object, visible or not. The ->inner_comp field (used only at file | |
183 | scope) stores whether an incomplete array type at file scope was | |
184 | completed at an inner scope to an array size other than 1. | |
185 | ||
f805d53d | 186 | The ->u.label field is used for labels. It points to a structure |
187 | which stores additional information used for warnings. | |
188 | ||
4194491a | 189 | The depth field is copied from the scope structure that holds this |
190 | decl. It is used to preserve the proper ordering of the ->shadowed | |
191 | field (see bind()) and also for a handful of special-case checks. | |
192 | Finally, the invisible bit is true for a decl which should be | |
193 | ignored for purposes of normal name lookup, and the nested bit is | |
194 | true for a decl that's been bound a second time in an inner scope; | |
195 | in all such cases, the binding in the outer scope will have its | |
196 | invisible bit true. */ | |
393b349a | 197 | |
fb1e4f4a | 198 | struct GTY((chain_next ("%h.prev"))) c_binding { |
f805d53d | 199 | union GTY(()) { /* first so GTY desc can use decl */ |
200 | tree GTY((tag ("0"))) type; /* the type in this scope */ | |
201 | struct c_label_vars * GTY((tag ("1"))) label; /* for warnings */ | |
202 | } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u; | |
393b349a | 203 | tree decl; /* the decl bound */ |
204 | tree id; /* the identifier it's bound to */ | |
205 | struct c_binding *prev; /* the previous decl in this scope */ | |
206 | struct c_binding *shadowed; /* the innermost decl shadowed by this one */ | |
4194491a | 207 | unsigned int depth : 28; /* depth of this scope */ |
208 | BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */ | |
209 | BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */ | |
606a02e3 | 210 | BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */ |
843bd2fa | 211 | BOOL_BITFIELD in_struct : 1; /* currently defined as struct field */ |
6fb80942 | 212 | location_t locus; /* location for nested bindings */ |
393b349a | 213 | }; |
4194491a | 214 | #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth) |
215 | #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth) | |
216 | #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/) | |
217 | #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/) | |
393b349a | 218 | |
219 | #define I_SYMBOL_BINDING(node) \ | |
84166705 | 220 | (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding) |
393b349a | 221 | #define I_SYMBOL_DECL(node) \ |
222 | (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0) | |
223 | ||
224 | #define I_TAG_BINDING(node) \ | |
84166705 | 225 | (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding) |
393b349a | 226 | #define I_TAG_DECL(node) \ |
227 | (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0) | |
228 | ||
229 | #define I_LABEL_BINDING(node) \ | |
84166705 | 230 | (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding) |
393b349a | 231 | #define I_LABEL_DECL(node) \ |
232 | (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0) | |
233 | ||
56533c31 | 234 | /* Each C symbol points to three linked lists of c_binding structures. |
235 | These describe the values of the identifier in the three different | |
236 | namespaces defined by the language. */ | |
237 | ||
fb1e4f4a | 238 | struct GTY(()) lang_identifier { |
56533c31 | 239 | struct c_common_identifier common_id; |
240 | struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */ | |
241 | struct c_binding *tag_binding; /* struct/union/enum tags */ | |
242 | struct c_binding *label_binding; /* labels */ | |
243 | }; | |
244 | ||
245 | /* Validate c-lang.c's assumptions. */ | |
246 | extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate | |
247 | [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1]; | |
248 | ||
249 | /* The resulting tree type. */ | |
250 | ||
fb1e4f4a | 251 | union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"), |
a68f7a8d | 252 | chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node |
fb1e4f4a | 253 | { |
56533c31 | 254 | union tree_node GTY ((tag ("0"), |
255 | desc ("tree_node_structure (&%h)"))) | |
256 | generic; | |
257 | struct lang_identifier GTY ((tag ("1"))) identifier; | |
258 | }; | |
259 | ||
f805d53d | 260 | /* Track bindings and other things that matter for goto warnings. For |
261 | efficiency, we do not gather all the decls at the point of | |
262 | definition. Instead, we point into the bindings structure. As | |
263 | scopes are popped, we update these structures and gather the decls | |
264 | that matter at that time. */ | |
265 | ||
266 | struct GTY(()) c_spot_bindings { | |
267 | /* The currently open scope which holds bindings defined when the | |
268 | label was defined or the goto statement was found. */ | |
269 | struct c_scope *scope; | |
270 | /* The bindings in the scope field which were defined at the point | |
271 | of the label or goto. This lets us look at older or newer | |
272 | bindings in the scope, as appropriate. */ | |
273 | struct c_binding *bindings_in_scope; | |
274 | /* The number of statement expressions that have started since this | |
275 | label or goto statement was defined. This is zero if we are at | |
276 | the same statement expression level. It is positive if we are in | |
277 | a statement expression started since this spot. It is negative | |
278 | if this spot was in a statement expression and we have left | |
279 | it. */ | |
280 | int stmt_exprs; | |
281 | /* Whether we started in a statement expression but are no longer in | |
282 | it. This is set to true if stmt_exprs ever goes negative. */ | |
283 | bool left_stmt_expr; | |
284 | }; | |
285 | ||
286 | /* This structure is used to keep track of bindings seen when a goto | |
287 | statement is defined. This is only used if we see the goto | |
288 | statement before we see the label. */ | |
289 | ||
290 | struct GTY(()) c_goto_bindings { | |
291 | /* The location of the goto statement. */ | |
292 | location_t loc; | |
293 | /* The bindings of the goto statement. */ | |
294 | struct c_spot_bindings goto_bindings; | |
295 | }; | |
296 | ||
297 | typedef struct c_goto_bindings *c_goto_bindings_p; | |
f805d53d | 298 | |
299 | /* The additional information we keep track of for a label binding. | |
300 | These fields are updated as scopes are popped. */ | |
301 | ||
302 | struct GTY(()) c_label_vars { | |
303 | /* The shadowed c_label_vars, when one label shadows another (which | |
304 | can only happen using a __label__ declaration). */ | |
305 | struct c_label_vars *shadowed; | |
306 | /* The bindings when the label was defined. */ | |
307 | struct c_spot_bindings label_bindings; | |
308 | /* A list of decls that we care about: decls about which we should | |
309 | warn if a goto branches to this label from later in the function. | |
310 | Decls are added to this list as scopes are popped. We only add | |
311 | the decls that matter. */ | |
f1f41a6c | 312 | vec<tree, va_gc> *decls_in_scope; |
f805d53d | 313 | /* A list of goto statements to this label. This is only used for |
314 | goto statements seen before the label was defined, so that we can | |
315 | issue appropriate warnings for them. */ | |
f1f41a6c | 316 | vec<c_goto_bindings_p, va_gc> *gotos; |
f805d53d | 317 | }; |
318 | ||
393b349a | 319 | /* Each c_scope structure describes the complete contents of one |
320 | scope. Four scopes are distinguished specially: the innermost or | |
321 | current scope, the innermost function scope, the file scope (always | |
322 | the second to outermost) and the outermost or external scope. | |
3bdb6310 | 323 | |
324 | Most declarations are recorded in the current scope. | |
325 | ||
326 | All normal label declarations are recorded in the innermost | |
327 | function scope, as are bindings of undeclared identifiers to | |
328 | error_mark_node. (GCC permits nested functions as an extension, | |
329 | hence the 'innermost' qualifier.) Explicitly declared labels | |
330 | (using the __label__ extension) appear in the current scope. | |
331 | ||
393b349a | 332 | Being in the file scope (current_scope == file_scope) causes |
3bdb6310 | 333 | special behavior in several places below. Also, under some |
334 | conditions the Objective-C front end records declarations in the | |
393b349a | 335 | file scope even though that isn't the current scope. |
336 | ||
337 | All declarations with external linkage are recorded in the external | |
338 | scope, even if they aren't visible there; this models the fact that | |
339 | such declarations are visible to the entire program, and (with a | |
340 | bit of cleverness, see pushdecl) allows diagnosis of some violations | |
341 | of C99 6.2.2p7 and 6.2.7p2: | |
342 | ||
343 | If, within the same translation unit, the same identifier appears | |
344 | with both internal and external linkage, the behavior is | |
345 | undefined. | |
3bdb6310 | 346 | |
393b349a | 347 | All declarations that refer to the same object or function shall |
348 | have compatible type; otherwise, the behavior is undefined. | |
349 | ||
350 | Initially only the built-in declarations, which describe compiler | |
351 | intrinsic functions plus a subset of the standard library, are in | |
352 | this scope. | |
353 | ||
354 | The order of the blocks list matters, and it is frequently appended | |
355 | to. To avoid having to walk all the way to the end of the list on | |
356 | each insertion, or reverse the list later, we maintain a pointer to | |
357 | the last list entry. (FIXME: It should be feasible to use a reversed | |
358 | list here.) | |
359 | ||
360 | The bindings list is strictly in reverse order of declarations; | |
361 | pop_scope relies on this. */ | |
3bdb6310 | 362 | |
51ef3909 | 363 | |
fb1e4f4a | 364 | struct GTY((chain_next ("%h.outer"))) c_scope { |
b3924a2c | 365 | /* The scope containing this one. */ |
366 | struct c_scope *outer; | |
367 | ||
368 | /* The next outermost function scope. */ | |
369 | struct c_scope *outer_function; | |
370 | ||
393b349a | 371 | /* All bindings in this scope. */ |
372 | struct c_binding *bindings; | |
b3924a2c | 373 | |
374 | /* For each scope (except the global one), a chain of BLOCK nodes | |
375 | for all the scopes that were entered and exited one level down. */ | |
376 | tree blocks; | |
3bdb6310 | 377 | tree blocks_last; |
b3924a2c | 378 | |
393b349a | 379 | /* The depth of this scope. Used to keep the ->shadowed chain of |
380 | bindings sorted innermost to outermost. */ | |
381 | unsigned int depth : 28; | |
382 | ||
b3924a2c | 383 | /* True if we are currently filling this scope with parameter |
384 | declarations. */ | |
2ccf1c3a | 385 | BOOL_BITFIELD parm_flag : 1; |
b3924a2c | 386 | |
32d33ab2 | 387 | /* True if we saw [*] in this scope. Used to give an error messages |
388 | if these appears in a function definition. */ | |
389 | BOOL_BITFIELD had_vla_unspec : 1; | |
390 | ||
f74be9a1 | 391 | /* True if we already complained about forward parameter decls |
392 | in this scope. This prevents double warnings on | |
393 | foo (int a; int b; ...) */ | |
2ccf1c3a | 394 | BOOL_BITFIELD warned_forward_parm_decls : 1; |
f74be9a1 | 395 | |
b3924a2c | 396 | /* True if this is the outermost block scope of a function body. |
397 | This scope contains the parameters, the local variables declared | |
398 | in the outermost block, and all the labels (except those in | |
399 | nested functions, or declared at block scope with __label__). */ | |
2ccf1c3a | 400 | BOOL_BITFIELD function_body : 1; |
b3924a2c | 401 | |
402 | /* True means make a BLOCK for this scope no matter what. */ | |
2ccf1c3a | 403 | BOOL_BITFIELD keep : 1; |
3ae3a17f | 404 | |
405 | /* True means that an unsuffixed float constant is _Decimal64. */ | |
406 | BOOL_BITFIELD float_const_decimal64 : 1; | |
f805d53d | 407 | |
408 | /* True if this scope has any label bindings. This is used to speed | |
409 | up searching for labels when popping scopes, particularly since | |
410 | labels are normally only found at function scope. */ | |
411 | BOOL_BITFIELD has_label_bindings : 1; | |
f583ffd4 | 412 | |
413 | /* True if we should issue a warning if a goto statement crosses any | |
414 | of the bindings. We still need to check the list of bindings to | |
415 | find the specific ones we need to warn about. This is true if | |
416 | decl_jump_unsafe would return true for any of the bindings. This | |
417 | is used to avoid looping over all the bindings unnecessarily. */ | |
418 | BOOL_BITFIELD has_jump_unsafe_decl : 1; | |
b3924a2c | 419 | }; |
51ef3909 | 420 | |
6e899616 | 421 | /* The scope currently in effect. */ |
4214af46 | 422 | |
6e899616 | 423 | static GTY(()) struct c_scope *current_scope; |
51ef3909 | 424 | |
bdc33d98 | 425 | /* The innermost function scope. Ordinary (not explicitly declared) |
426 | labels, bindings to error_mark_node, and the lazily-created | |
427 | bindings of __func__ and its friends get this scope. */ | |
b3924a2c | 428 | |
6e899616 | 429 | static GTY(()) struct c_scope *current_function_scope; |
bdc33d98 | 430 | |
393b349a | 431 | /* The C file scope. This is reset for each input translation unit. */ |
432 | ||
433 | static GTY(()) struct c_scope *file_scope; | |
434 | ||
435 | /* The outermost scope. This is used for all declarations with | |
436 | external linkage, and only these, hence the name. */ | |
437 | ||
438 | static GTY(()) struct c_scope *external_scope; | |
439 | ||
440 | /* A chain of c_scope structures awaiting reuse. */ | |
441 | ||
7035b2ab | 442 | static GTY((deletable)) struct c_scope *scope_freelist; |
393b349a | 443 | |
444 | /* A chain of c_binding structures awaiting reuse. */ | |
51ef3909 | 445 | |
7035b2ab | 446 | static GTY((deletable)) struct c_binding *binding_freelist; |
51ef3909 | 447 | |
206bdab4 | 448 | /* Append VAR to LIST in scope SCOPE. */ |
3bdb6310 | 449 | #define SCOPE_LIST_APPEND(scope, list, decl) do { \ |
450 | struct c_scope *s_ = (scope); \ | |
451 | tree d_ = (decl); \ | |
452 | if (s_->list##_last) \ | |
93110716 | 453 | BLOCK_CHAIN (s_->list##_last) = d_; \ |
3bdb6310 | 454 | else \ |
455 | s_->list = d_; \ | |
456 | s_->list##_last = d_; \ | |
457 | } while (0) | |
458 | ||
459 | /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */ | |
460 | #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \ | |
461 | struct c_scope *t_ = (tscope); \ | |
462 | struct c_scope *f_ = (fscope); \ | |
463 | if (t_->to##_last) \ | |
93110716 | 464 | BLOCK_CHAIN (t_->to##_last) = f_->from; \ |
3bdb6310 | 465 | else \ |
466 | t_->to = f_->from; \ | |
467 | t_->to##_last = f_->from##_last; \ | |
468 | } while (0) | |
469 | ||
551ed71a | 470 | /* A c_inline_static structure stores details of a static identifier |
471 | referenced in a definition of a function that may be an inline | |
472 | definition if no subsequent declaration of that function uses | |
473 | "extern" or does not use "inline". */ | |
474 | ||
475 | struct GTY((chain_next ("%h.next"))) c_inline_static { | |
476 | /* The location for a diagnostic. */ | |
477 | location_t location; | |
478 | ||
479 | /* The function that may be an inline definition. */ | |
480 | tree function; | |
481 | ||
482 | /* The object or function referenced. */ | |
483 | tree static_decl; | |
484 | ||
485 | /* What sort of reference this is. */ | |
486 | enum c_inline_static_type type; | |
487 | ||
488 | /* The next such structure or NULL. */ | |
489 | struct c_inline_static *next; | |
490 | }; | |
491 | ||
492 | /* List of static identifiers used or referenced in functions that may | |
493 | be inline definitions. */ | |
494 | static GTY(()) struct c_inline_static *c_inline_statics; | |
495 | ||
6e899616 | 496 | /* True means unconditionally make a BLOCK for the next scope pushed. */ |
51ef3909 | 497 | |
bdc33d98 | 498 | static bool keep_next_level_flag; |
51ef3909 | 499 | |
393b349a | 500 | /* True means the next call to push_scope will be the outermost scope |
e69f6ec7 | 501 | of a function body, so do not push a new scope, merely cease |
502 | expecting parameter decls. */ | |
4214af46 | 503 | |
e69f6ec7 | 504 | static bool next_is_function_body; |
51ef3909 | 505 | |
f1f41a6c | 506 | /* A vector of pointers to c_binding structures. */ |
843bd2fa | 507 | |
508 | typedef struct c_binding *c_binding_ptr; | |
843bd2fa | 509 | |
510 | /* Information that we keep for a struct or union while it is being | |
511 | parsed. */ | |
512 | ||
513 | struct c_struct_parse_info | |
514 | { | |
515 | /* If warn_cxx_compat, a list of types defined within this | |
516 | struct. */ | |
f1f41a6c | 517 | vec<tree> struct_types; |
843bd2fa | 518 | /* If warn_cxx_compat, a list of field names which have bindings, |
519 | and which are defined in this struct, but which are not defined | |
520 | in any enclosing struct. This is used to clear the in_struct | |
521 | field of the c_bindings structure. */ | |
f1f41a6c | 522 | vec<c_binding_ptr> fields; |
843bd2fa | 523 | /* If warn_cxx_compat, a list of typedef names used when defining |
524 | fields in this struct. */ | |
f1f41a6c | 525 | vec<tree> typedefs_seen; |
843bd2fa | 526 | }; |
527 | ||
528 | /* Information for the struct or union currently being parsed, or | |
529 | NULL if not parsing a struct or union. */ | |
530 | static struct c_struct_parse_info *struct_parse_info; | |
531 | ||
51ef3909 | 532 | /* Forward declarations. */ |
393b349a | 533 | static tree lookup_name_in_scope (tree, struct c_scope *); |
e60a6f7b | 534 | static tree c_make_fname_decl (location_t, tree, int); |
9553111d | 535 | static tree grokdeclarator (const struct c_declarator *, |
536 | struct c_declspecs *, | |
a75b1c71 | 537 | enum decl_context, bool, tree *, tree *, tree *, |
538 | bool *, enum deprecated_states); | |
ac206aff | 539 | static tree grokparms (struct c_arg_info *, bool); |
1cae46be | 540 | static void layout_array_type (tree); |
508ea33a | 541 | static void warn_defaults_to (location_t, int, const char *, ...) |
542 | ATTRIBUTE_GCC_DIAG(3,4); | |
51ef3909 | 543 | \f |
d1725120 | 544 | /* T is a statement. Add it to the statement-tree. This is the |
545 | C/ObjC version--C++ has a slightly different version of this | |
546 | function. */ | |
547 | ||
548 | tree | |
549 | add_stmt (tree t) | |
550 | { | |
551 | enum tree_code code = TREE_CODE (t); | |
552 | ||
35cc02b5 | 553 | if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR) |
d1725120 | 554 | { |
555 | if (!EXPR_HAS_LOCATION (t)) | |
556 | SET_EXPR_LOCATION (t, input_location); | |
557 | } | |
558 | ||
559 | if (code == LABEL_EXPR || code == CASE_LABEL_EXPR) | |
560 | STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1; | |
561 | ||
562 | /* Add T to the statement-tree. Non-side-effect statements need to be | |
563 | recorded during statement expressions. */ | |
cacfdc02 | 564 | if (!building_stmt_list_p ()) |
565 | push_stmt_list (); | |
d1725120 | 566 | append_to_statement_list_force (t, &cur_stmt_list); |
567 | ||
568 | return t; | |
569 | } | |
7714837c | 570 | \f |
571 | /* Build a pointer type using the default pointer mode. */ | |
572 | ||
573 | static tree | |
574 | c_build_pointer_type (tree to_type) | |
575 | { | |
576 | addr_space_t as = to_type == error_mark_node? ADDR_SPACE_GENERIC | |
577 | : TYPE_ADDR_SPACE (to_type); | |
578 | enum machine_mode pointer_mode; | |
579 | ||
580 | if (as != ADDR_SPACE_GENERIC || c_default_pointer_mode == VOIDmode) | |
581 | pointer_mode = targetm.addr_space.pointer_mode (as); | |
582 | else | |
583 | pointer_mode = c_default_pointer_mode; | |
584 | return build_pointer_type_for_mode (to_type, pointer_mode, false); | |
585 | } | |
586 | ||
d1725120 | 587 | \f |
f583ffd4 | 588 | /* Return true if we will want to say something if a goto statement |
589 | crosses DECL. */ | |
590 | ||
591 | static bool | |
592 | decl_jump_unsafe (tree decl) | |
593 | { | |
da579dbb | 594 | if (error_operand_p (decl)) |
f583ffd4 | 595 | return false; |
596 | ||
597 | /* Always warn about crossing variably modified types. */ | |
598 | if ((TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == TYPE_DECL) | |
599 | && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) | |
600 | return true; | |
601 | ||
602 | /* Otherwise, only warn if -Wgoto-misses-init and this is an | |
603 | initialized automatic decl. */ | |
604 | if (warn_jump_misses_init | |
605 | && TREE_CODE (decl) == VAR_DECL | |
606 | && !TREE_STATIC (decl) | |
607 | && DECL_INITIAL (decl) != NULL_TREE) | |
608 | return true; | |
609 | ||
610 | return false; | |
611 | } | |
612 | \f | |
88da234d | 613 | |
51ef3909 | 614 | void |
1cae46be | 615 | c_print_identifier (FILE *file, tree node, int indent) |
51ef3909 | 616 | { |
393b349a | 617 | print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4); |
618 | print_node (file, "tag", I_TAG_DECL (node), indent + 4); | |
619 | print_node (file, "label", I_LABEL_DECL (node), indent + 4); | |
5c6e5756 | 620 | if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN) |
518796ad | 621 | { |
622 | tree rid = ridpointers[C_RID_CODE (node)]; | |
623 | indent_to (file, indent + 4); | |
038ca0d1 | 624 | fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"", |
6f817829 | 625 | (void *) rid, IDENTIFIER_POINTER (rid)); |
518796ad | 626 | } |
51ef3909 | 627 | } |
393b349a | 628 | |
629 | /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL, | |
630 | which may be any of several kinds of DECL or TYPE or error_mark_node, | |
631 | in the scope SCOPE. */ | |
632 | static void | |
6fb80942 | 633 | bind (tree name, tree decl, struct c_scope *scope, bool invisible, |
634 | bool nested, location_t locus) | |
393b349a | 635 | { |
636 | struct c_binding *b, **here; | |
637 | ||
638 | if (binding_freelist) | |
639 | { | |
640 | b = binding_freelist; | |
641 | binding_freelist = b->prev; | |
642 | } | |
643 | else | |
25a27413 | 644 | b = ggc_alloc<c_binding> (); |
393b349a | 645 | |
646 | b->shadowed = 0; | |
647 | b->decl = decl; | |
648 | b->id = name; | |
4194491a | 649 | b->depth = scope->depth; |
650 | b->invisible = invisible; | |
651 | b->nested = nested; | |
606a02e3 | 652 | b->inner_comp = 0; |
843bd2fa | 653 | b->in_struct = 0; |
6fb80942 | 654 | b->locus = locus; |
606a02e3 | 655 | |
f805d53d | 656 | b->u.type = NULL; |
393b349a | 657 | |
658 | b->prev = scope->bindings; | |
659 | scope->bindings = b; | |
660 | ||
f583ffd4 | 661 | if (decl_jump_unsafe (decl)) |
662 | scope->has_jump_unsafe_decl = 1; | |
663 | ||
393b349a | 664 | if (!name) |
665 | return; | |
666 | ||
667 | switch (TREE_CODE (decl)) | |
668 | { | |
669 | case LABEL_DECL: here = &I_LABEL_BINDING (name); break; | |
670 | case ENUMERAL_TYPE: | |
671 | case UNION_TYPE: | |
672 | case RECORD_TYPE: here = &I_TAG_BINDING (name); break; | |
673 | case VAR_DECL: | |
674 | case FUNCTION_DECL: | |
675 | case TYPE_DECL: | |
676 | case CONST_DECL: | |
677 | case PARM_DECL: | |
678 | case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break; | |
679 | ||
680 | default: | |
231bd014 | 681 | gcc_unreachable (); |
393b349a | 682 | } |
683 | ||
684 | /* Locate the appropriate place in the chain of shadowed decls | |
685 | to insert this binding. Normally, scope == current_scope and | |
686 | this does nothing. */ | |
4194491a | 687 | while (*here && (*here)->depth > scope->depth) |
393b349a | 688 | here = &(*here)->shadowed; |
689 | ||
690 | b->shadowed = *here; | |
691 | *here = b; | |
692 | } | |
693 | ||
694 | /* Clear the binding structure B, stick it on the binding_freelist, | |
695 | and return the former value of b->prev. This is used by pop_scope | |
696 | and get_parm_info to iterate destructively over all the bindings | |
697 | from a given scope. */ | |
698 | static struct c_binding * | |
699 | free_binding_and_advance (struct c_binding *b) | |
700 | { | |
701 | struct c_binding *prev = b->prev; | |
702 | ||
4194491a | 703 | memset (b, 0, sizeof (struct c_binding)); |
393b349a | 704 | b->prev = binding_freelist; |
705 | binding_freelist = b; | |
706 | ||
707 | return prev; | |
708 | } | |
709 | ||
f805d53d | 710 | /* Bind a label. Like bind, but skip fields which aren't used for |
711 | labels, and add the LABEL_VARS value. */ | |
712 | static void | |
713 | bind_label (tree name, tree label, struct c_scope *scope, | |
714 | struct c_label_vars *label_vars) | |
715 | { | |
716 | struct c_binding *b; | |
717 | ||
718 | bind (name, label, scope, /*invisible=*/false, /*nested=*/false, | |
719 | UNKNOWN_LOCATION); | |
720 | ||
721 | scope->has_label_bindings = true; | |
722 | ||
723 | b = scope->bindings; | |
724 | gcc_assert (b->decl == label); | |
725 | label_vars->shadowed = b->u.label; | |
726 | b->u.label = label_vars; | |
727 | } | |
51ef3909 | 728 | \f |
fc7d78c7 | 729 | /* Hook called at end of compilation to assume 1 elt |
6e899616 | 730 | for a file-scope tentative array defn that wasn't complete before. */ |
4214af46 | 731 | |
fc7d78c7 | 732 | void |
1cae46be | 733 | c_finish_incomplete_decl (tree decl) |
fc7d78c7 | 734 | { |
d7f020e8 | 735 | if (TREE_CODE (decl) == VAR_DECL) |
fc7d78c7 | 736 | { |
737 | tree type = TREE_TYPE (decl); | |
d7f020e8 | 738 | if (type != error_mark_node |
739 | && TREE_CODE (type) == ARRAY_TYPE | |
84166705 | 740 | && !DECL_EXTERNAL (decl) |
d7f020e8 | 741 | && TYPE_DOMAIN (type) == 0) |
fc7d78c7 | 742 | { |
e60a6f7b | 743 | warning_at (DECL_SOURCE_LOCATION (decl), |
744 | 0, "array %q+D assumed to have one element", decl); | |
d7f020e8 | 745 | |
c271bdb2 | 746 | complete_array_type (&TREE_TYPE (decl), NULL_TREE, true); |
fc7d78c7 | 747 | |
d43c4681 | 748 | relayout_decl (decl); |
fc7d78c7 | 749 | } |
750 | } | |
751 | } | |
752 | \f | |
551ed71a | 753 | /* Record that inline function FUNC contains a reference (location |
754 | LOC) to static DECL (file-scope or function-local according to | |
755 | TYPE). */ | |
756 | ||
757 | void | |
758 | record_inline_static (location_t loc, tree func, tree decl, | |
759 | enum c_inline_static_type type) | |
760 | { | |
25a27413 | 761 | c_inline_static *csi = ggc_alloc<c_inline_static> (); |
551ed71a | 762 | csi->location = loc; |
763 | csi->function = func; | |
764 | csi->static_decl = decl; | |
765 | csi->type = type; | |
766 | csi->next = c_inline_statics; | |
767 | c_inline_statics = csi; | |
768 | } | |
769 | ||
770 | /* Check for references to static declarations in inline functions at | |
771 | the end of the translation unit and diagnose them if the functions | |
772 | are still inline definitions. */ | |
773 | ||
774 | static void | |
775 | check_inline_statics (void) | |
776 | { | |
777 | struct c_inline_static *csi; | |
778 | for (csi = c_inline_statics; csi; csi = csi->next) | |
779 | { | |
780 | if (DECL_EXTERNAL (csi->function)) | |
781 | switch (csi->type) | |
782 | { | |
783 | case csi_internal: | |
784 | pedwarn (csi->location, 0, | |
785 | "%qD is static but used in inline function %qD " | |
786 | "which is not static", csi->static_decl, csi->function); | |
787 | break; | |
788 | case csi_modifiable: | |
789 | pedwarn (csi->location, 0, | |
790 | "%q+D is static but declared in inline function %qD " | |
791 | "which is not static", csi->static_decl, csi->function); | |
792 | break; | |
793 | default: | |
794 | gcc_unreachable (); | |
795 | } | |
796 | } | |
797 | c_inline_statics = NULL; | |
798 | } | |
799 | \f | |
f805d53d | 800 | /* Fill in a c_spot_bindings structure. If DEFINING is true, set it |
801 | for the current state, otherwise set it to uninitialized. */ | |
802 | ||
803 | static void | |
804 | set_spot_bindings (struct c_spot_bindings *p, bool defining) | |
805 | { | |
806 | if (defining) | |
807 | { | |
808 | p->scope = current_scope; | |
809 | p->bindings_in_scope = current_scope->bindings; | |
810 | } | |
811 | else | |
812 | { | |
813 | p->scope = NULL; | |
814 | p->bindings_in_scope = NULL; | |
815 | } | |
816 | p->stmt_exprs = 0; | |
817 | p->left_stmt_expr = false; | |
818 | } | |
819 | ||
f805d53d | 820 | /* Update spot bindings P as we pop out of SCOPE. Return true if we |
821 | should push decls for a label. */ | |
822 | ||
823 | static bool | |
824 | update_spot_bindings (struct c_scope *scope, struct c_spot_bindings *p) | |
825 | { | |
826 | if (p->scope != scope) | |
827 | { | |
828 | /* This label or goto is defined in some other scope, or it is a | |
829 | label which is not yet defined. There is nothing to | |
830 | update. */ | |
831 | return false; | |
832 | } | |
833 | ||
834 | /* Adjust the spot bindings to refer to the bindings already defined | |
835 | in the enclosing scope. */ | |
836 | p->scope = scope->outer; | |
837 | p->bindings_in_scope = p->scope->bindings; | |
838 | ||
839 | return true; | |
840 | } | |
841 | \f | |
c17b85ea | 842 | /* The Objective-C front-end often needs to determine the current scope. */ |
843 | ||
844 | void * | |
99d7d801 | 845 | objc_get_current_scope (void) |
c17b85ea | 846 | { |
847 | return current_scope; | |
848 | } | |
849 | ||
850 | /* The following function is used only by Objective-C. It needs to live here | |
851 | because it accesses the innards of c_scope. */ | |
852 | ||
853 | void | |
854 | objc_mark_locals_volatile (void *enclosing_blk) | |
855 | { | |
856 | struct c_scope *scope; | |
393b349a | 857 | struct c_binding *b; |
d9cf68bf | 858 | |
859 | for (scope = current_scope; | |
c17b85ea | 860 | scope && scope != enclosing_blk; |
861 | scope = scope->outer) | |
862 | { | |
393b349a | 863 | for (b = scope->bindings; b; b = b->prev) |
34d3c5de | 864 | objc_volatilize_decl (b->decl); |
393b349a | 865 | |
c17b85ea | 866 | /* Do not climb up past the current function. */ |
867 | if (scope->function_body) | |
868 | break; | |
d9cf68bf | 869 | } |
870 | } | |
871 | ||
1d2bb655 | 872 | /* Return true if we are in the global binding level. */ |
51ef3909 | 873 | |
1d2bb655 | 874 | bool |
1cae46be | 875 | global_bindings_p (void) |
51ef3909 | 876 | { |
b354cec8 | 877 | return current_scope == file_scope; |
51ef3909 | 878 | } |
879 | ||
880 | void | |
1cae46be | 881 | keep_next_level (void) |
51ef3909 | 882 | { |
bdc33d98 | 883 | keep_next_level_flag = true; |
51ef3909 | 884 | } |
885 | ||
3ae3a17f | 886 | /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */ |
887 | ||
888 | void | |
889 | set_float_const_decimal64 (void) | |
890 | { | |
891 | current_scope->float_const_decimal64 = true; | |
892 | } | |
893 | ||
894 | /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */ | |
895 | ||
896 | void | |
897 | clear_float_const_decimal64 (void) | |
898 | { | |
899 | current_scope->float_const_decimal64 = false; | |
900 | } | |
901 | ||
902 | /* Return nonzero if an unsuffixed float constant is _Decimal64. */ | |
903 | ||
904 | bool | |
905 | float_const_decimal64_p (void) | |
906 | { | |
907 | return current_scope->float_const_decimal64; | |
908 | } | |
909 | ||
6e899616 | 910 | /* Identify this scope as currently being filled with parameters. */ |
51ef3909 | 911 | |
912 | void | |
2b652cf3 | 913 | declare_parm_level (void) |
51ef3909 | 914 | { |
6e899616 | 915 | current_scope->parm_flag = true; |
51ef3909 | 916 | } |
917 | ||
51ef3909 | 918 | void |
393b349a | 919 | push_scope (void) |
51ef3909 | 920 | { |
e69f6ec7 | 921 | if (next_is_function_body) |
51ef3909 | 922 | { |
31ddae9f | 923 | /* This is the transition from the parameters to the top level |
924 | of the function body. These are the same scope | |
6e899616 | 925 | (C99 6.2.1p4,6) so we do not push another scope structure. |
e69f6ec7 | 926 | next_is_function_body is set only by store_parm_decls, which |
927 | in turn is called when and only when we are about to | |
928 | encounter the opening curly brace for the function body. | |
31ddae9f | 929 | |
e69f6ec7 | 930 | The outermost block of a function always gets a BLOCK node, |
931 | because the debugging output routines expect that each | |
7981458e | 932 | function has at least one BLOCK. */ |
6e899616 | 933 | current_scope->parm_flag = false; |
934 | current_scope->function_body = true; | |
e69f6ec7 | 935 | current_scope->keep = true; |
6e899616 | 936 | current_scope->outer_function = current_function_scope; |
937 | current_function_scope = current_scope; | |
bdc33d98 | 938 | |
939 | keep_next_level_flag = false; | |
e69f6ec7 | 940 | next_is_function_body = false; |
3ae3a17f | 941 | |
942 | /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */ | |
943 | if (current_scope->outer) | |
944 | current_scope->float_const_decimal64 | |
945 | = current_scope->outer->float_const_decimal64; | |
946 | else | |
947 | current_scope->float_const_decimal64 = false; | |
51ef3909 | 948 | } |
31ddae9f | 949 | else |
950 | { | |
393b349a | 951 | struct c_scope *scope; |
952 | if (scope_freelist) | |
953 | { | |
954 | scope = scope_freelist; | |
955 | scope_freelist = scope->outer; | |
956 | } | |
957 | else | |
25a27413 | 958 | scope = ggc_cleared_alloc<c_scope> (); |
51ef3909 | 959 | |
3ae3a17f | 960 | /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */ |
961 | if (current_scope) | |
962 | scope->float_const_decimal64 = current_scope->float_const_decimal64; | |
963 | else | |
964 | scope->float_const_decimal64 = false; | |
965 | ||
6e899616 | 966 | scope->keep = keep_next_level_flag; |
967 | scope->outer = current_scope; | |
393b349a | 968 | scope->depth = current_scope ? (current_scope->depth + 1) : 0; |
969 | ||
970 | /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but | |
971 | possible. */ | |
972 | if (current_scope && scope->depth == 0) | |
973 | { | |
974 | scope->depth--; | |
4742c91a | 975 | sorry ("GCC supports only %u nested scopes", scope->depth); |
393b349a | 976 | } |
14338e9a | 977 | |
6e899616 | 978 | current_scope = scope; |
979 | keep_next_level_flag = false; | |
31ddae9f | 980 | } |
cbf025c5 | 981 | } |
4214af46 | 982 | |
f805d53d | 983 | /* This is called when we are leaving SCOPE. For each label defined |
984 | in SCOPE, add any appropriate decls to its decls_in_scope fields. | |
985 | These are the decls whose initialization will be skipped by a goto | |
986 | later in the function. */ | |
987 | ||
988 | static void | |
989 | update_label_decls (struct c_scope *scope) | |
990 | { | |
991 | struct c_scope *s; | |
992 | ||
993 | s = scope; | |
994 | while (s != NULL) | |
995 | { | |
996 | if (s->has_label_bindings) | |
997 | { | |
998 | struct c_binding *b; | |
999 | ||
1000 | for (b = s->bindings; b != NULL; b = b->prev) | |
1001 | { | |
1002 | struct c_label_vars *label_vars; | |
1003 | struct c_binding *b1; | |
f583ffd4 | 1004 | bool hjud; |
f805d53d | 1005 | unsigned int ix; |
1006 | struct c_goto_bindings *g; | |
1007 | ||
1008 | if (TREE_CODE (b->decl) != LABEL_DECL) | |
1009 | continue; | |
1010 | label_vars = b->u.label; | |
1011 | ||
1012 | b1 = label_vars->label_bindings.bindings_in_scope; | |
f583ffd4 | 1013 | if (label_vars->label_bindings.scope == NULL) |
1014 | hjud = false; | |
1015 | else | |
1016 | hjud = label_vars->label_bindings.scope->has_jump_unsafe_decl; | |
f805d53d | 1017 | if (update_spot_bindings (scope, &label_vars->label_bindings)) |
1018 | { | |
1019 | /* This label is defined in this scope. */ | |
f583ffd4 | 1020 | if (hjud) |
f805d53d | 1021 | { |
f583ffd4 | 1022 | for (; b1 != NULL; b1 = b1->prev) |
1023 | { | |
1024 | /* A goto from later in the function to this | |
1025 | label will never see the initialization | |
1026 | of B1, if any. Save it to issue a | |
1027 | warning if needed. */ | |
1028 | if (decl_jump_unsafe (b1->decl)) | |
f1f41a6c | 1029 | vec_safe_push(label_vars->decls_in_scope, b1->decl); |
f583ffd4 | 1030 | } |
f805d53d | 1031 | } |
1032 | } | |
1033 | ||
1034 | /* Update the bindings of any goto statements associated | |
1035 | with this label. */ | |
f1f41a6c | 1036 | FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g) |
f805d53d | 1037 | update_spot_bindings (scope, &g->goto_bindings); |
1038 | } | |
1039 | } | |
1040 | ||
1041 | /* Don't search beyond the current function. */ | |
1042 | if (s == current_function_scope) | |
1043 | break; | |
1044 | ||
1045 | s = s->outer; | |
1046 | } | |
1047 | } | |
1048 | ||
b3e83e1e | 1049 | /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */ |
1050 | ||
1051 | static void | |
1052 | set_type_context (tree type, tree context) | |
1053 | { | |
1054 | for (type = TYPE_MAIN_VARIANT (type); type; | |
1055 | type = TYPE_NEXT_VARIANT (type)) | |
1056 | TYPE_CONTEXT (type) = context; | |
1057 | } | |
1058 | ||
6e899616 | 1059 | /* Exit a scope. Restore the state of the identifier-decl mappings |
393b349a | 1060 | that were in effect when this scope was entered. Return a BLOCK |
1061 | node containing all the DECLs in this scope that are of interest | |
1062 | to debug info generation. */ | |
51ef3909 | 1063 | |
1064 | tree | |
393b349a | 1065 | pop_scope (void) |
51ef3909 | 1066 | { |
3bdb6310 | 1067 | struct c_scope *scope = current_scope; |
393b349a | 1068 | tree block, context, p; |
1069 | struct c_binding *b; | |
a0c21e2b | 1070 | |
393b349a | 1071 | bool functionbody = scope->function_body; |
1072 | bool keep = functionbody || scope->keep || scope->bindings; | |
3bdb6310 | 1073 | |
f805d53d | 1074 | update_label_decls (scope); |
f5d156fd | 1075 | |
3bdb6310 | 1076 | /* If appropriate, create a BLOCK to record the decls for the life |
1077 | of this function. */ | |
1078 | block = 0; | |
1079 | if (keep) | |
1080 | { | |
1081 | block = make_node (BLOCK); | |
3bdb6310 | 1082 | BLOCK_SUBBLOCKS (block) = scope->blocks; |
1083 | TREE_USED (block) = 1; | |
3bdb6310 | 1084 | |
393b349a | 1085 | /* In each subblock, record that this is its superior. */ |
93110716 | 1086 | for (p = scope->blocks; p; p = BLOCK_CHAIN (p)) |
393b349a | 1087 | BLOCK_SUPERCONTEXT (p) = block; |
3bdb6310 | 1088 | |
393b349a | 1089 | BLOCK_VARS (block) = 0; |
1090 | } | |
31ddae9f | 1091 | |
393b349a | 1092 | /* The TYPE_CONTEXTs for all of the tagged types belonging to this |
1093 | scope must be set so that they point to the appropriate | |
1094 | construct, i.e. either to the current FUNCTION_DECL node, or | |
1095 | else to the BLOCK node we just constructed. | |
3bdb6310 | 1096 | |
393b349a | 1097 | Note that for tagged types whose scope is just the formal |
1098 | parameter list for some function type specification, we can't | |
1099 | properly set their TYPE_CONTEXTs here, because we don't have a | |
1100 | pointer to the appropriate FUNCTION_TYPE node readily available | |
1101 | to us. For those cases, the TYPE_CONTEXTs of the relevant tagged | |
1102 | type nodes get set in `grokdeclarator' as soon as we have created | |
1103 | the FUNCTION_TYPE node which will represent the "scope" for these | |
1104 | "parameter list local" tagged types. */ | |
1105 | if (scope->function_body) | |
1106 | context = current_function_decl; | |
1107 | else if (scope == file_scope) | |
4d714d55 | 1108 | { |
23bdc9ca | 1109 | tree file_decl = build_translation_unit_decl (NULL_TREE); |
4d714d55 | 1110 | context = file_decl; |
1111 | } | |
393b349a | 1112 | else |
1113 | context = block; | |
3bdb6310 | 1114 | |
393b349a | 1115 | /* Clear all bindings in this scope. */ |
1116 | for (b = scope->bindings; b; b = free_binding_and_advance (b)) | |
31ddae9f | 1117 | { |
393b349a | 1118 | p = b->decl; |
3bdb6310 | 1119 | switch (TREE_CODE (p)) |
bdc33d98 | 1120 | { |
3bdb6310 | 1121 | case LABEL_DECL: |
393b349a | 1122 | /* Warnings for unused labels, errors for undefined labels. */ |
3bdb6310 | 1123 | if (TREE_USED (p) && !DECL_INITIAL (p)) |
bdc33d98 | 1124 | { |
3cf8b391 | 1125 | error ("label %q+D used but not defined", p); |
3bdb6310 | 1126 | DECL_INITIAL (p) = error_mark_node; |
bdc33d98 | 1127 | } |
48e1416a | 1128 | else |
92fccaaa | 1129 | warn_for_unused_label (p); |
1130 | ||
393b349a | 1131 | /* Labels go in BLOCK_VARS. */ |
1767a056 | 1132 | DECL_CHAIN (p) = BLOCK_VARS (block); |
393b349a | 1133 | BLOCK_VARS (block) = p; |
231bd014 | 1134 | gcc_assert (I_LABEL_BINDING (b->id) == b); |
a0c938f0 | 1135 | I_LABEL_BINDING (b->id) = b->shadowed; |
f805d53d | 1136 | |
1137 | /* Also pop back to the shadowed label_vars. */ | |
1138 | release_tree_vector (b->u.label->decls_in_scope); | |
1139 | b->u.label = b->u.label->shadowed; | |
a0c938f0 | 1140 | break; |
31ddae9f | 1141 | |
393b349a | 1142 | case ENUMERAL_TYPE: |
1143 | case UNION_TYPE: | |
1144 | case RECORD_TYPE: | |
b3e83e1e | 1145 | set_type_context (p, context); |
393b349a | 1146 | |
1147 | /* Types may not have tag-names, in which case the type | |
1148 | appears in the bindings list with b->id NULL. */ | |
1149 | if (b->id) | |
1150 | { | |
231bd014 | 1151 | gcc_assert (I_TAG_BINDING (b->id) == b); |
393b349a | 1152 | I_TAG_BINDING (b->id) = b->shadowed; |
1153 | } | |
a0c938f0 | 1154 | break; |
31ddae9f | 1155 | |
3bdb6310 | 1156 | case FUNCTION_DECL: |
393b349a | 1157 | /* Propagate TREE_ADDRESSABLE from nested functions to their |
1158 | containing functions. */ | |
84166705 | 1159 | if (!TREE_ASM_WRITTEN (p) |
3bdb6310 | 1160 | && DECL_INITIAL (p) != 0 |
1161 | && TREE_ADDRESSABLE (p) | |
1162 | && DECL_ABSTRACT_ORIGIN (p) != 0 | |
1163 | && DECL_ABSTRACT_ORIGIN (p) != p) | |
1164 | TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1; | |
8a1f0315 | 1165 | if (!DECL_EXTERNAL (p) |
c42cc79e | 1166 | && !DECL_INITIAL (p) |
1167 | && scope != file_scope | |
1168 | && scope != external_scope) | |
8a1f0315 | 1169 | { |
3cf8b391 | 1170 | error ("nested function %q+D declared but never defined", p); |
8a1f0315 | 1171 | undef_nested_function = true; |
1172 | } | |
c42cc79e | 1173 | else if (DECL_DECLARED_INLINE_P (p) |
1174 | && TREE_PUBLIC (p) | |
709cdea6 | 1175 | && !DECL_INITIAL (p)) |
1176 | { | |
1177 | /* C99 6.7.4p6: "a function with external linkage... declared | |
1178 | with an inline function specifier ... shall also be defined | |
1179 | in the same translation unit." */ | |
1180 | if (!flag_gnu89_inline) | |
1181 | pedwarn (input_location, 0, | |
1182 | "inline function %q+D declared but never defined", p); | |
1183 | DECL_EXTERNAL (p) = 1; | |
1184 | } | |
c42cc79e | 1185 | |
393b349a | 1186 | goto common_symbol; |
3bdb6310 | 1187 | |
1188 | case VAR_DECL: | |
491e04ef | 1189 | /* Warnings for unused variables. */ |
abc6c64f | 1190 | if ((!TREE_USED (p) || !DECL_READ_P (p)) |
8babbffa | 1191 | && !TREE_NO_WARNING (p) |
3bdb6310 | 1192 | && !DECL_IN_SYSTEM_HEADER (p) |
1193 | && DECL_NAME (p) | |
393b349a | 1194 | && !DECL_ARTIFICIAL (p) |
f98b02b2 | 1195 | && scope != file_scope |
a0c938f0 | 1196 | && scope != external_scope) |
abc6c64f | 1197 | { |
1198 | if (!TREE_USED (p)) | |
1199 | warning (OPT_Wunused_variable, "unused variable %q+D", p); | |
1200 | else if (DECL_CONTEXT (p) == current_function_decl) | |
1201 | warning_at (DECL_SOURCE_LOCATION (p), | |
1202 | OPT_Wunused_but_set_variable, | |
1203 | "variable %qD set but not used", p); | |
1204 | } | |
393b349a | 1205 | |
606a02e3 | 1206 | if (b->inner_comp) |
1207 | { | |
3cf8b391 | 1208 | error ("type of array %q+D completed incompatibly with" |
1209 | " implicit initialization", p); | |
606a02e3 | 1210 | } |
1211 | ||
aab2cf92 | 1212 | /* Fall through. */ |
393b349a | 1213 | case TYPE_DECL: |
1214 | case CONST_DECL: | |
1215 | common_symbol: | |
1216 | /* All of these go in BLOCK_VARS, but only if this is the | |
1217 | binding in the home scope. */ | |
4194491a | 1218 | if (!b->nested) |
393b349a | 1219 | { |
1767a056 | 1220 | DECL_CHAIN (p) = BLOCK_VARS (block); |
393b349a | 1221 | BLOCK_VARS (block) = p; |
1222 | } | |
add5c2ae | 1223 | else if (VAR_OR_FUNCTION_DECL_P (p) && scope != file_scope) |
6fb80942 | 1224 | { |
1225 | /* For block local externs add a special | |
1226 | DECL_EXTERNAL decl for debug info generation. */ | |
1227 | tree extp = copy_node (p); | |
1228 | ||
1229 | DECL_EXTERNAL (extp) = 1; | |
1230 | TREE_STATIC (extp) = 0; | |
1231 | TREE_PUBLIC (extp) = 1; | |
1232 | DECL_INITIAL (extp) = NULL_TREE; | |
1233 | DECL_LANG_SPECIFIC (extp) = NULL; | |
1234 | DECL_CONTEXT (extp) = current_function_decl; | |
1235 | if (TREE_CODE (p) == FUNCTION_DECL) | |
1236 | { | |
1237 | DECL_RESULT (extp) = NULL_TREE; | |
1238 | DECL_SAVED_TREE (extp) = NULL_TREE; | |
1239 | DECL_STRUCT_FUNCTION (extp) = NULL; | |
1240 | } | |
1241 | if (b->locus != UNKNOWN_LOCATION) | |
1242 | DECL_SOURCE_LOCATION (extp) = b->locus; | |
1767a056 | 1243 | DECL_CHAIN (extp) = BLOCK_VARS (block); |
6fb80942 | 1244 | BLOCK_VARS (block) = extp; |
1245 | } | |
262b29f2 | 1246 | /* If this is the file scope set DECL_CONTEXT of each decl to |
1247 | the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p | |
1248 | work. */ | |
1249 | if (scope == file_scope) | |
b3e83e1e | 1250 | { |
1251 | DECL_CONTEXT (p) = context; | |
262b29f2 | 1252 | if (TREE_CODE (p) == TYPE_DECL |
1253 | && TREE_TYPE (p) != error_mark_node) | |
b3e83e1e | 1254 | set_type_context (TREE_TYPE (p), context); |
1255 | } | |
f74be9a1 | 1256 | |
393b349a | 1257 | /* Fall through. */ |
1258 | /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have | |
1259 | already been put there by store_parm_decls. Unused- | |
1260 | parameter warnings are handled by function.c. | |
1261 | error_mark_node obviously does not go in BLOCK_VARS and | |
1262 | does not get unused-variable warnings. */ | |
1263 | case PARM_DECL: | |
1264 | case ERROR_MARK: | |
1265 | /* It is possible for a decl not to have a name. We get | |
1266 | here with b->id NULL in this case. */ | |
1267 | if (b->id) | |
3bdb6310 | 1268 | { |
231bd014 | 1269 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); |
393b349a | 1270 | I_SYMBOL_BINDING (b->id) = b->shadowed; |
f805d53d | 1271 | if (b->shadowed && b->shadowed->u.type) |
1272 | TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type; | |
3bdb6310 | 1273 | } |
1274 | break; | |
393b349a | 1275 | |
1276 | default: | |
231bd014 | 1277 | gcc_unreachable (); |
3bdb6310 | 1278 | } |
1279 | } | |
31ddae9f | 1280 | |
14338e9a | 1281 | |
393b349a | 1282 | /* Dispose of the block that we just made inside some higher level. */ |
1283 | if ((scope->function_body || scope == file_scope) && context) | |
31ddae9f | 1284 | { |
393b349a | 1285 | DECL_INITIAL (context) = block; |
1286 | BLOCK_SUPERCONTEXT (block) = context; | |
31ddae9f | 1287 | } |
3bdb6310 | 1288 | else if (scope->outer) |
8862e8ce | 1289 | { |
3bdb6310 | 1290 | if (block) |
1291 | SCOPE_LIST_APPEND (scope->outer, blocks, block); | |
1292 | /* If we did not make a block for the scope just exited, any | |
1293 | blocks made for inner scopes must be carried forward so they | |
1294 | will later become subblocks of something else. */ | |
1295 | else if (scope->blocks) | |
1296 | SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks); | |
8862e8ce | 1297 | } |
51ef3909 | 1298 | |
6e899616 | 1299 | /* Pop the current scope, and free the structure for reuse. */ |
393b349a | 1300 | current_scope = scope->outer; |
1301 | if (scope->function_body) | |
1302 | current_function_scope = scope->outer_function; | |
1303 | ||
1304 | memset (scope, 0, sizeof (struct c_scope)); | |
1305 | scope->outer = scope_freelist; | |
1306 | scope_freelist = scope; | |
51ef3909 | 1307 | |
51ef3909 | 1308 | return block; |
1309 | } | |
8862e8ce | 1310 | |
393b349a | 1311 | void |
1312 | push_file_scope (void) | |
1313 | { | |
1314 | tree decl; | |
393b349a | 1315 | |
3d738236 | 1316 | if (file_scope) |
1317 | return; | |
1318 | ||
393b349a | 1319 | push_scope (); |
1320 | file_scope = current_scope; | |
1321 | ||
1322 | start_fname_decls (); | |
1323 | ||
1767a056 | 1324 | for (decl = visible_builtins; decl; decl = DECL_CHAIN (decl)) |
4194491a | 1325 | bind (DECL_NAME (decl), decl, file_scope, |
6fb80942 | 1326 | /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl)); |
393b349a | 1327 | } |
1328 | ||
1329 | void | |
1330 | pop_file_scope (void) | |
1331 | { | |
1332 | /* In case there were missing closebraces, get us back to the global | |
1333 | binding level. */ | |
1334 | while (current_scope != file_scope) | |
1335 | pop_scope (); | |
1336 | ||
1337 | /* __FUNCTION__ is defined at file scope (""). This | |
1338 | call may not be necessary as my tests indicate it | |
1339 | still works without it. */ | |
1340 | finish_fname_decls (); | |
1341 | ||
551ed71a | 1342 | check_inline_statics (); |
1343 | ||
aea7e1dc | 1344 | /* This is the point to write out a PCH if we're doing that. |
1345 | In that case we do not want to do anything else. */ | |
393b349a | 1346 | if (pch_file) |
aea7e1dc | 1347 | { |
1348 | c_common_write_pch (); | |
1349 | return; | |
1350 | } | |
393b349a | 1351 | |
aea7e1dc | 1352 | /* Pop off the file scope and close this translation unit. */ |
393b349a | 1353 | pop_scope (); |
1354 | file_scope = 0; | |
8bc09a74 | 1355 | |
1356 | maybe_apply_pending_pragma_weaks (); | |
393b349a | 1357 | } |
f805d53d | 1358 | \f |
1359 | /* Adjust the bindings for the start of a statement expression. */ | |
1360 | ||
1361 | void | |
1362 | c_bindings_start_stmt_expr (struct c_spot_bindings* switch_bindings) | |
1363 | { | |
1364 | struct c_scope *scope; | |
1365 | ||
1366 | for (scope = current_scope; scope != NULL; scope = scope->outer) | |
1367 | { | |
1368 | struct c_binding *b; | |
1369 | ||
1370 | if (!scope->has_label_bindings) | |
1371 | continue; | |
1372 | ||
1373 | for (b = scope->bindings; b != NULL; b = b->prev) | |
1374 | { | |
1375 | struct c_label_vars *label_vars; | |
1376 | unsigned int ix; | |
1377 | struct c_goto_bindings *g; | |
1378 | ||
1379 | if (TREE_CODE (b->decl) != LABEL_DECL) | |
1380 | continue; | |
1381 | label_vars = b->u.label; | |
1382 | ++label_vars->label_bindings.stmt_exprs; | |
f1f41a6c | 1383 | FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g) |
f805d53d | 1384 | ++g->goto_bindings.stmt_exprs; |
1385 | } | |
1386 | } | |
1387 | ||
1388 | if (switch_bindings != NULL) | |
1389 | ++switch_bindings->stmt_exprs; | |
1390 | } | |
1391 | ||
1392 | /* Adjust the bindings for the end of a statement expression. */ | |
1393 | ||
1394 | void | |
1395 | c_bindings_end_stmt_expr (struct c_spot_bindings *switch_bindings) | |
1396 | { | |
1397 | struct c_scope *scope; | |
1398 | ||
1399 | for (scope = current_scope; scope != NULL; scope = scope->outer) | |
1400 | { | |
1401 | struct c_binding *b; | |
1402 | ||
1403 | if (!scope->has_label_bindings) | |
1404 | continue; | |
1405 | ||
1406 | for (b = scope->bindings; b != NULL; b = b->prev) | |
1407 | { | |
1408 | struct c_label_vars *label_vars; | |
1409 | unsigned int ix; | |
1410 | struct c_goto_bindings *g; | |
1411 | ||
1412 | if (TREE_CODE (b->decl) != LABEL_DECL) | |
1413 | continue; | |
1414 | label_vars = b->u.label; | |
1415 | --label_vars->label_bindings.stmt_exprs; | |
1416 | if (label_vars->label_bindings.stmt_exprs < 0) | |
1417 | { | |
1418 | label_vars->label_bindings.left_stmt_expr = true; | |
1419 | label_vars->label_bindings.stmt_exprs = 0; | |
1420 | } | |
f1f41a6c | 1421 | FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g) |
f805d53d | 1422 | { |
1423 | --g->goto_bindings.stmt_exprs; | |
1424 | if (g->goto_bindings.stmt_exprs < 0) | |
1425 | { | |
1426 | g->goto_bindings.left_stmt_expr = true; | |
1427 | g->goto_bindings.stmt_exprs = 0; | |
1428 | } | |
1429 | } | |
1430 | } | |
1431 | } | |
393b349a | 1432 | |
f805d53d | 1433 | if (switch_bindings != NULL) |
1434 | { | |
1435 | --switch_bindings->stmt_exprs; | |
1436 | gcc_assert (switch_bindings->stmt_exprs >= 0); | |
1437 | } | |
1438 | } | |
51ef3909 | 1439 | \f |
51ef3909 | 1440 | /* Push a definition or a declaration of struct, union or enum tag "name". |
1441 | "type" should be the type node. | |
e60a6f7b | 1442 | We assume that the tag "name" is not already defined, and has a location |
1443 | of LOC. | |
51ef3909 | 1444 | |
1445 | Note that the definition may really be just a forward reference. | |
1446 | In that case, the TYPE_SIZE will be zero. */ | |
1447 | ||
393b349a | 1448 | static void |
e60a6f7b | 1449 | pushtag (location_t loc, tree name, tree type) |
51ef3909 | 1450 | { |
b3924a2c | 1451 | /* Record the identifier as the type's name if it has none. */ |
393b349a | 1452 | if (name && !TYPE_NAME (type)) |
1453 | TYPE_NAME (type) = name; | |
0b09525f | 1454 | bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false, loc); |
c275c235 | 1455 | |
51ef3909 | 1456 | /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the |
6e899616 | 1457 | tagged type we just added to the current scope. This fake |
51ef3909 | 1458 | NULL-named TYPE_DECL node helps dwarfout.c to know when it needs |
df5e872e | 1459 | to output a representation of a tagged type, and it also gives |
51ef3909 | 1460 | us a convenient place to record the "scope start" address for the |
1461 | tagged type. */ | |
1462 | ||
e60a6f7b | 1463 | TYPE_STUB_DECL (type) = pushdecl (build_decl (loc, |
1464 | TYPE_DECL, NULL_TREE, type)); | |
464217f3 | 1465 | |
1466 | /* An approximation for now, so we can tell this is a function-scope tag. | |
393b349a | 1467 | This will be updated in pop_scope. */ |
464217f3 | 1468 | TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type)); |
26dbec0a | 1469 | |
1470 | if (warn_cxx_compat && name != NULL_TREE) | |
1471 | { | |
1472 | struct c_binding *b = I_SYMBOL_BINDING (name); | |
1473 | ||
1474 | if (b != NULL | |
1475 | && b->decl != NULL_TREE | |
1476 | && TREE_CODE (b->decl) == TYPE_DECL | |
1477 | && (B_IN_CURRENT_SCOPE (b) | |
1478 | || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b))) | |
1479 | && (TYPE_MAIN_VARIANT (TREE_TYPE (b->decl)) | |
1480 | != TYPE_MAIN_VARIANT (type))) | |
1481 | { | |
1482 | warning_at (loc, OPT_Wc___compat, | |
1483 | ("using %qD as both a typedef and a tag is " | |
1484 | "invalid in C++"), | |
1485 | b->decl); | |
1486 | if (b->locus != UNKNOWN_LOCATION) | |
1487 | inform (b->locus, "originally defined here"); | |
1488 | } | |
1489 | } | |
51ef3909 | 1490 | } |
1491 | \f | |
679bf177 | 1492 | /* Subroutine of compare_decls. Allow harmless mismatches in return |
c4dc8be9 | 1493 | and argument types provided that the type modes match. This function |
1494 | return a unified type given a suitable match, and 0 otherwise. */ | |
1495 | ||
1496 | static tree | |
679bf177 | 1497 | match_builtin_function_types (tree newtype, tree oldtype) |
c4dc8be9 | 1498 | { |
1499 | tree newrettype, oldrettype; | |
1500 | tree newargs, oldargs; | |
1501 | tree trytype, tryargs; | |
1502 | ||
1503 | /* Accept the return type of the new declaration if same modes. */ | |
1504 | oldrettype = TREE_TYPE (oldtype); | |
1505 | newrettype = TREE_TYPE (newtype); | |
1506 | ||
1507 | if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype)) | |
1508 | return 0; | |
1509 | ||
1510 | oldargs = TYPE_ARG_TYPES (oldtype); | |
1511 | newargs = TYPE_ARG_TYPES (newtype); | |
1512 | tryargs = newargs; | |
1513 | ||
1514 | while (oldargs || newargs) | |
1515 | { | |
84166705 | 1516 | if (!oldargs |
1517 | || !newargs | |
1518 | || !TREE_VALUE (oldargs) | |
1519 | || !TREE_VALUE (newargs) | |
c4dc8be9 | 1520 | || TYPE_MODE (TREE_VALUE (oldargs)) |
1521 | != TYPE_MODE (TREE_VALUE (newargs))) | |
1522 | return 0; | |
1523 | ||
1524 | oldargs = TREE_CHAIN (oldargs); | |
1525 | newargs = TREE_CHAIN (newargs); | |
1526 | } | |
1527 | ||
1528 | trytype = build_function_type (newrettype, tryargs); | |
1529 | return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype)); | |
1530 | } | |
1531 | ||
4885b286 | 1532 | /* Subroutine of diagnose_mismatched_decls. Check for function type |
679bf177 | 1533 | mismatch involving an empty arglist vs a nonempty one and give clearer |
7c2df241 | 1534 | diagnostics. */ |
679bf177 | 1535 | static void |
1536 | diagnose_arglist_conflict (tree newdecl, tree olddecl, | |
1537 | tree newtype, tree oldtype) | |
1538 | { | |
1539 | tree t; | |
51ef3909 | 1540 | |
679bf177 | 1541 | if (TREE_CODE (olddecl) != FUNCTION_DECL |
3ed275a6 | 1542 | || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype)) |
a36cf284 | 1543 | || !((!prototype_p (oldtype) && DECL_INITIAL (olddecl) == 0) |
1544 | || (!prototype_p (newtype) && DECL_INITIAL (newdecl) == 0))) | |
679bf177 | 1545 | return; |
b33f0698 | 1546 | |
679bf177 | 1547 | t = TYPE_ARG_TYPES (oldtype); |
1548 | if (t == 0) | |
1549 | t = TYPE_ARG_TYPES (newtype); | |
1550 | for (; t; t = TREE_CHAIN (t)) | |
1551 | { | |
1552 | tree type = TREE_VALUE (t); | |
51ef3909 | 1553 | |
679bf177 | 1554 | if (TREE_CHAIN (t) == 0 |
1555 | && TYPE_MAIN_VARIANT (type) != void_type_node) | |
1556 | { | |
5bcc316e | 1557 | inform (input_location, "a parameter list with an ellipsis can%'t match " |
679bf177 | 1558 | "an empty parameter name list declaration"); |
1559 | break; | |
1560 | } | |
1561 | ||
1562 | if (c_type_promotes_to (type) != type) | |
1563 | { | |
5bcc316e | 1564 | inform (input_location, "an argument type that has a default promotion can%'t match " |
679bf177 | 1565 | "an empty parameter name list declaration"); |
1566 | break; | |
1567 | } | |
1568 | } | |
1569 | } | |
51ef3909 | 1570 | |
679bf177 | 1571 | /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an |
1572 | old-style function definition, NEWDECL is a prototype declaration. | |
1573 | Diagnose inconsistencies in the argument list. Returns TRUE if | |
1574 | the prototype is compatible, FALSE if not. */ | |
1575 | static bool | |
1576 | validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype) | |
1577 | { | |
2a222da1 | 1578 | tree newargs, oldargs; |
1579 | int i; | |
1580 | ||
97ca039c | 1581 | #define END_OF_ARGLIST(t) ((t) == void_type_node) |
2a222da1 | 1582 | |
1583 | oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype); | |
1584 | newargs = TYPE_ARG_TYPES (newtype); | |
1585 | i = 1; | |
1586 | ||
1587 | for (;;) | |
93f10b04 | 1588 | { |
cd27e3ac | 1589 | tree oldargtype = TREE_VALUE (oldargs); |
1590 | tree newargtype = TREE_VALUE (newargs); | |
1591 | ||
1592 | if (oldargtype == error_mark_node || newargtype == error_mark_node) | |
1593 | return false; | |
1594 | ||
b560fabd | 1595 | oldargtype = (TYPE_ATOMIC (oldargtype) |
1596 | ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype), | |
1597 | TYPE_QUAL_ATOMIC) | |
1598 | : TYPE_MAIN_VARIANT (oldargtype)); | |
1599 | newargtype = (TYPE_ATOMIC (newargtype) | |
1600 | ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype), | |
1601 | TYPE_QUAL_ATOMIC) | |
1602 | : TYPE_MAIN_VARIANT (newargtype)); | |
2a222da1 | 1603 | |
1604 | if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype)) | |
1605 | break; | |
1606 | ||
1607 | /* Reaching the end of just one list means the two decls don't | |
1608 | agree on the number of arguments. */ | |
1609 | if (END_OF_ARGLIST (oldargtype)) | |
93f10b04 | 1610 | { |
3cf8b391 | 1611 | error ("prototype for %q+D declares more arguments " |
1612 | "than previous old-style definition", newdecl); | |
2a222da1 | 1613 | return false; |
93f10b04 | 1614 | } |
2a222da1 | 1615 | else if (END_OF_ARGLIST (newargtype)) |
679bf177 | 1616 | { |
3cf8b391 | 1617 | error ("prototype for %q+D declares fewer arguments " |
1618 | "than previous old-style definition", newdecl); | |
679bf177 | 1619 | return false; |
1620 | } | |
2a222da1 | 1621 | |
1622 | /* Type for passing arg must be consistent with that declared | |
1623 | for the arg. */ | |
84166705 | 1624 | else if (!comptypes (oldargtype, newargtype)) |
679bf177 | 1625 | { |
3cf8b391 | 1626 | error ("prototype for %q+D declares argument %d" |
07e3a3d2 | 1627 | " with incompatible type", |
3cf8b391 | 1628 | newdecl, i); |
679bf177 | 1629 | return false; |
1630 | } | |
2a222da1 | 1631 | |
1632 | oldargs = TREE_CHAIN (oldargs); | |
1633 | newargs = TREE_CHAIN (newargs); | |
1634 | i++; | |
93f10b04 | 1635 | } |
2a222da1 | 1636 | |
1637 | /* If we get here, no errors were found, but do issue a warning | |
1638 | for this poor-style construct. */ | |
3cf8b391 | 1639 | warning (0, "prototype for %q+D follows non-prototype definition", |
1640 | newdecl); | |
2a222da1 | 1641 | return true; |
1642 | #undef END_OF_ARGLIST | |
679bf177 | 1643 | } |
1f0395c4 | 1644 | |
679bf177 | 1645 | /* Subroutine of diagnose_mismatched_decls. Report the location of DECL, |
1646 | first in a pair of mismatched declarations, using the diagnostic | |
1647 | function DIAG. */ | |
1648 | static void | |
a52d5726 | 1649 | locate_old_decl (tree decl) |
679bf177 | 1650 | { |
8b023e7c | 1651 | if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl) |
1652 | && !C_DECL_DECLARED_BUILTIN (decl)) | |
679bf177 | 1653 | ; |
1654 | else if (DECL_INITIAL (decl)) | |
5bcc316e | 1655 | inform (input_location, "previous definition of %q+D was here", decl); |
679bf177 | 1656 | else if (C_DECL_IMPLICIT (decl)) |
5bcc316e | 1657 | inform (input_location, "previous implicit declaration of %q+D was here", decl); |
679bf177 | 1658 | else |
5bcc316e | 1659 | inform (input_location, "previous declaration of %q+D was here", decl); |
679bf177 | 1660 | } |
51ef3909 | 1661 | |
679bf177 | 1662 | /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL. |
1663 | Returns true if the caller should proceed to merge the two, false | |
1664 | if OLDDECL should simply be discarded. As a side effect, issues | |
1665 | all necessary diagnostics for invalid or poor-style combinations. | |
1666 | If it returns true, writes the types of NEWDECL and OLDDECL to | |
1667 | *NEWTYPEP and *OLDTYPEP - these may have been adjusted from | |
1668 | TREE_TYPE (NEWDECL, OLDDECL) respectively. */ | |
1669 | ||
1670 | static bool | |
1671 | diagnose_mismatched_decls (tree newdecl, tree olddecl, | |
1672 | tree *newtypep, tree *oldtypep) | |
1673 | { | |
1674 | tree newtype, oldtype; | |
1675 | bool pedwarned = false; | |
1676 | bool warned = false; | |
67be63e6 | 1677 | bool retval = true; |
679bf177 | 1678 | |
c195b9ad | 1679 | #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \ |
1680 | && DECL_EXTERNAL (DECL)) | |
1681 | ||
679bf177 | 1682 | /* If we have error_mark_node for either decl or type, just discard |
1683 | the previous decl - we're in an error cascade already. */ | |
1684 | if (olddecl == error_mark_node || newdecl == error_mark_node) | |
1685 | return false; | |
2a222da1 | 1686 | *oldtypep = oldtype = TREE_TYPE (olddecl); |
1687 | *newtypep = newtype = TREE_TYPE (newdecl); | |
679bf177 | 1688 | if (oldtype == error_mark_node || newtype == error_mark_node) |
1689 | return false; | |
1690 | ||
1691 | /* Two different categories of symbol altogether. This is an error | |
1692 | unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */ | |
51ef3909 | 1693 | if (TREE_CODE (olddecl) != TREE_CODE (newdecl)) |
1694 | { | |
393b349a | 1695 | if (!(TREE_CODE (olddecl) == FUNCTION_DECL |
1696 | && DECL_BUILT_IN (olddecl) | |
1697 | && !C_DECL_DECLARED_BUILTIN (olddecl))) | |
51ef3909 | 1698 | { |
3cf8b391 | 1699 | error ("%q+D redeclared as different kind of symbol", newdecl); |
a52d5726 | 1700 | locate_old_decl (olddecl); |
679bf177 | 1701 | } |
1702 | else if (TREE_PUBLIC (newdecl)) | |
3cf8b391 | 1703 | warning (0, "built-in function %q+D declared as non-function", |
1704 | newdecl); | |
8b6866af | 1705 | else |
3cf8b391 | 1706 | warning (OPT_Wshadow, "declaration of %q+D shadows " |
1707 | "a built-in function", newdecl); | |
679bf177 | 1708 | return false; |
1709 | } | |
1710 | ||
5dad28f1 | 1711 | /* Enumerators have no linkage, so may only be declared once in a |
1712 | given scope. */ | |
1713 | if (TREE_CODE (olddecl) == CONST_DECL) | |
1714 | { | |
3cf8b391 | 1715 | error ("redeclaration of enumerator %q+D", newdecl); |
a52d5726 | 1716 | locate_old_decl (olddecl); |
5dad28f1 | 1717 | return false; |
1718 | } | |
1719 | ||
3ed275a6 | 1720 | if (!comptypes (oldtype, newtype)) |
679bf177 | 1721 | { |
a3ad3e27 | 1722 | if (TREE_CODE (olddecl) == FUNCTION_DECL |
393b349a | 1723 | && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl)) |
679bf177 | 1724 | { |
1725 | /* Accept harmless mismatch in function types. | |
1726 | This is for the ffs and fprintf builtins. */ | |
1727 | tree trytype = match_builtin_function_types (newtype, oldtype); | |
1728 | ||
3ed275a6 | 1729 | if (trytype && comptypes (newtype, trytype)) |
2a222da1 | 1730 | *oldtypep = oldtype = trytype; |
679bf177 | 1731 | else |
51ef3909 | 1732 | { |
679bf177 | 1733 | /* If types don't match for a built-in, throw away the |
1734 | built-in. No point in calling locate_old_decl here, it | |
7c2df241 | 1735 | won't print anything. */ |
3cf8b391 | 1736 | warning (0, "conflicting types for built-in function %q+D", |
1737 | newdecl); | |
679bf177 | 1738 | return false; |
51ef3909 | 1739 | } |
679bf177 | 1740 | } |
1741 | else if (TREE_CODE (olddecl) == FUNCTION_DECL | |
9a6486a6 | 1742 | && DECL_IS_BUILTIN (olddecl)) |
679bf177 | 1743 | { |
1744 | /* A conflicting function declaration for a predeclared | |
1745 | function that isn't actually built in. Objective C uses | |
1746 | these. The new declaration silently overrides everything | |
1747 | but the volatility (i.e. noreturn) indication. See also | |
1748 | below. FIXME: Make Objective C use normal builtins. */ | |
1749 | TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl); | |
1750 | return false; | |
1751 | } | |
1752 | /* Permit void foo (...) to match int foo (...) if the latter is | |
1753 | the definition and implicit int was used. See | |
1754 | c-torture/compile/920625-2.c. */ | |
1755 | else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) | |
1756 | && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node | |
1757 | && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node | |
a49e09d9 | 1758 | && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl)) |
679bf177 | 1759 | { |
21ca8540 | 1760 | pedwarned = pedwarn (input_location, 0, |
1761 | "conflicting types for %q+D", newdecl); | |
679bf177 | 1762 | /* Make sure we keep void as the return type. */ |
2a222da1 | 1763 | TREE_TYPE (newdecl) = *newtypep = newtype = oldtype; |
679bf177 | 1764 | C_FUNCTION_IMPLICIT_INT (newdecl) = 0; |
51ef3909 | 1765 | } |
a49e09d9 | 1766 | /* Permit void foo (...) to match an earlier call to foo (...) with |
1767 | no declared type (thus, implicitly int). */ | |
1768 | else if (TREE_CODE (newdecl) == FUNCTION_DECL | |
1769 | && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node | |
1770 | && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node | |
1771 | && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl)) | |
1772 | { | |
21ca8540 | 1773 | pedwarned = pedwarn (input_location, 0, |
1774 | "conflicting types for %q+D", newdecl); | |
a49e09d9 | 1775 | /* Make sure we keep void as the return type. */ |
1776 | TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype; | |
a49e09d9 | 1777 | } |
51ef3909 | 1778 | else |
1779 | { | |
6d5d708e | 1780 | int new_quals = TYPE_QUALS (newtype); |
1781 | int old_quals = TYPE_QUALS (oldtype); | |
1782 | ||
1783 | if (new_quals != old_quals) | |
1784 | { | |
1785 | addr_space_t new_addr = DECODE_QUAL_ADDR_SPACE (new_quals); | |
1786 | addr_space_t old_addr = DECODE_QUAL_ADDR_SPACE (old_quals); | |
1787 | if (new_addr != old_addr) | |
1788 | { | |
1789 | if (ADDR_SPACE_GENERIC_P (new_addr)) | |
1790 | error ("conflicting named address spaces (generic vs %s) " | |
1791 | "for %q+D", | |
1792 | c_addr_space_name (old_addr), newdecl); | |
1793 | else if (ADDR_SPACE_GENERIC_P (old_addr)) | |
1794 | error ("conflicting named address spaces (%s vs generic) " | |
1795 | "for %q+D", | |
1796 | c_addr_space_name (new_addr), newdecl); | |
1797 | else | |
1798 | error ("conflicting named address spaces (%s vs %s) " | |
1799 | "for %q+D", | |
1800 | c_addr_space_name (new_addr), | |
1801 | c_addr_space_name (old_addr), | |
1802 | newdecl); | |
1803 | } | |
1804 | ||
1805 | if (CLEAR_QUAL_ADDR_SPACE (new_quals) | |
1806 | != CLEAR_QUAL_ADDR_SPACE (old_quals)) | |
1807 | error ("conflicting type qualifiers for %q+D", newdecl); | |
1808 | } | |
14338e9a | 1809 | else |
3cf8b391 | 1810 | error ("conflicting types for %q+D", newdecl); |
679bf177 | 1811 | diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype); |
a52d5726 | 1812 | locate_old_decl (olddecl); |
679bf177 | 1813 | return false; |
51ef3909 | 1814 | } |
51ef3909 | 1815 | } |
1816 | ||
679bf177 | 1817 | /* Redeclaration of a type is a constraint violation (6.7.2.3p1), |
1818 | but silently ignore the redeclaration if either is in a system | |
ce3765bf | 1819 | header. (Conflicting redeclarations were handled above.) This |
32074525 | 1820 | is allowed for C11 if the types are the same, not just |
ce3765bf | 1821 | compatible. */ |
679bf177 | 1822 | if (TREE_CODE (newdecl) == TYPE_DECL) |
31ddae9f | 1823 | { |
ce3765bf | 1824 | bool types_different = false; |
1825 | int comptypes_result; | |
1826 | ||
1827 | comptypes_result | |
1828 | = comptypes_check_different_types (oldtype, newtype, &types_different); | |
1829 | ||
1830 | if (comptypes_result != 1 || types_different) | |
1831 | { | |
1832 | error ("redefinition of typedef %q+D with different type", newdecl); | |
1833 | locate_old_decl (olddecl); | |
1834 | return false; | |
1835 | } | |
1836 | ||
7cb6f926 | 1837 | if (DECL_IN_SYSTEM_HEADER (newdecl) |
1838 | || DECL_IN_SYSTEM_HEADER (olddecl) | |
1839 | || TREE_NO_WARNING (newdecl) | |
1840 | || TREE_NO_WARNING (olddecl)) | |
aab2cf92 | 1841 | return true; /* Allow OLDDECL to continue in use. */ |
14338e9a | 1842 | |
ff889d78 | 1843 | if (variably_modified_type_p (newtype, NULL)) |
ce3765bf | 1844 | { |
ff889d78 | 1845 | error ("redefinition of typedef %q+D with variably modified type", |
1846 | newdecl); | |
ce3765bf | 1847 | locate_old_decl (olddecl); |
1848 | } | |
508ea33a | 1849 | else if (pedwarn_c99 (input_location, OPT_Wpedantic, |
1850 | "redefinition of typedef %q+D", newdecl)) | |
1851 | locate_old_decl (olddecl); | |
ce3765bf | 1852 | |
1853 | return true; | |
31ddae9f | 1854 | } |
51ef3909 | 1855 | |
679bf177 | 1856 | /* Function declarations can either be 'static' or 'extern' (no |
1857 | qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore | |
c42cc79e | 1858 | can never conflict with each other on account of linkage |
1859 | (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but | |
1860 | gnu89 mode permits two definitions if one is 'extern inline' and | |
1861 | one is not. The non- extern-inline definition supersedes the | |
1862 | extern-inline definition. */ | |
c195b9ad | 1863 | |
679bf177 | 1864 | else if (TREE_CODE (newdecl) == FUNCTION_DECL) |
51ef3909 | 1865 | { |
32a8d34e | 1866 | /* If you declare a built-in function name as static, or |
1867 | define the built-in with an old-style definition (so we | |
1868 | can't validate the argument list) the built-in definition is | |
1869 | overridden, but optionally warn this was a bad choice of name. */ | |
1870 | if (DECL_BUILT_IN (olddecl) | |
393b349a | 1871 | && !C_DECL_DECLARED_BUILTIN (olddecl) |
32a8d34e | 1872 | && (!TREE_PUBLIC (newdecl) |
1873 | || (DECL_INITIAL (newdecl) | |
a36cf284 | 1874 | && !prototype_p (TREE_TYPE (newdecl))))) |
51ef3909 | 1875 | { |
3cf8b391 | 1876 | warning (OPT_Wshadow, "declaration of %q+D shadows " |
1877 | "a built-in function", newdecl); | |
51ef3909 | 1878 | /* Discard the old built-in function. */ |
679bf177 | 1879 | return false; |
51ef3909 | 1880 | } |
14338e9a | 1881 | |
679bf177 | 1882 | if (DECL_INITIAL (newdecl)) |
594952f9 | 1883 | { |
67be63e6 | 1884 | if (DECL_INITIAL (olddecl)) |
c4dc8be9 | 1885 | { |
c195b9ad | 1886 | /* If both decls are in the same TU and the new declaration |
56d36a49 | 1887 | isn't overriding an extern inline reject the new decl. |
c42cc79e | 1888 | In c99, no overriding is allowed in the same translation |
1889 | unit. */ | |
1890 | if ((!DECL_EXTERN_INLINE (olddecl) | |
1891 | || DECL_EXTERN_INLINE (newdecl) | |
11950bdd | 1892 | || (!flag_gnu89_inline |
541e4101 | 1893 | && (!DECL_DECLARED_INLINE_P (olddecl) |
1894 | || !lookup_attribute ("gnu_inline", | |
1895 | DECL_ATTRIBUTES (olddecl))) | |
1896 | && (!DECL_DECLARED_INLINE_P (newdecl) | |
1897 | || !lookup_attribute ("gnu_inline", | |
1898 | DECL_ATTRIBUTES (newdecl)))) | |
541e4101 | 1899 | ) |
67be63e6 | 1900 | && same_translation_unit_p (newdecl, olddecl)) |
1901 | { | |
3cf8b391 | 1902 | error ("redefinition of %q+D", newdecl); |
a52d5726 | 1903 | locate_old_decl (olddecl); |
67be63e6 | 1904 | return false; |
1905 | } | |
c195b9ad | 1906 | } |
594952f9 | 1907 | } |
679bf177 | 1908 | /* If we have a prototype after an old-style function definition, |
1909 | the argument types must be checked specially. */ | |
1910 | else if (DECL_INITIAL (olddecl) | |
a36cf284 | 1911 | && !prototype_p (oldtype) && prototype_p (newtype) |
679bf177 | 1912 | && TYPE_ACTUAL_ARG_TYPES (oldtype) |
1913 | && !validate_proto_after_old_defn (newdecl, newtype, oldtype)) | |
63b3279d | 1914 | { |
a52d5726 | 1915 | locate_old_decl (olddecl); |
679bf177 | 1916 | return false; |
63b3279d | 1917 | } |
4194491a | 1918 | /* A non-static declaration (even an "extern") followed by a |
1919 | static declaration is undefined behavior per C99 6.2.2p3-5,7. | |
1920 | The same is true for a static forward declaration at block | |
1921 | scope followed by a non-static declaration/definition at file | |
1922 | scope. Static followed by non-static at the same scope is | |
1923 | not undefined behavior, and is the most convenient way to get | |
1924 | some effects (see e.g. what unwind-dw2-fde-glibc.c does to | |
1925 | the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but | |
fbf0afd1 | 1926 | we do diagnose it if -Wtraditional. */ |
679bf177 | 1927 | if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl)) |
51ef3909 | 1928 | { |
4194491a | 1929 | /* Two exceptions to the rule. If olddecl is an extern |
1930 | inline, or a predeclared function that isn't actually | |
1931 | built in, newdecl silently overrides olddecl. The latter | |
1932 | occur only in Objective C; see also above. (FIXME: Make | |
1933 | Objective C use normal builtins.) */ | |
1934 | if (!DECL_IS_BUILTIN (olddecl) | |
c195b9ad | 1935 | && !DECL_EXTERN_INLINE (olddecl)) |
679bf177 | 1936 | { |
3cf8b391 | 1937 | error ("static declaration of %q+D follows " |
1938 | "non-static declaration", newdecl); | |
a52d5726 | 1939 | locate_old_decl (olddecl); |
679bf177 | 1940 | } |
4194491a | 1941 | return false; |
51ef3909 | 1942 | } |
4194491a | 1943 | else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl)) |
97ed1d3b | 1944 | { |
4194491a | 1945 | if (DECL_CONTEXT (olddecl)) |
1946 | { | |
3cf8b391 | 1947 | error ("non-static declaration of %q+D follows " |
1948 | "static declaration", newdecl); | |
a52d5726 | 1949 | locate_old_decl (olddecl); |
4194491a | 1950 | return false; |
1951 | } | |
1952 | else if (warn_traditional) | |
1953 | { | |
48e1416a | 1954 | warned |= warning (OPT_Wtraditional, |
a52d5726 | 1955 | "non-static declaration of %q+D " |
1956 | "follows static declaration", newdecl); | |
4194491a | 1957 | } |
97ed1d3b | 1958 | } |
541e4101 | 1959 | |
1960 | /* Make sure gnu_inline attribute is either not present, or | |
1961 | present on all inline decls. */ | |
1962 | if (DECL_DECLARED_INLINE_P (olddecl) | |
1963 | && DECL_DECLARED_INLINE_P (newdecl)) | |
1964 | { | |
1965 | bool newa = lookup_attribute ("gnu_inline", | |
1966 | DECL_ATTRIBUTES (newdecl)) != NULL; | |
1967 | bool olda = lookup_attribute ("gnu_inline", | |
1968 | DECL_ATTRIBUTES (olddecl)) != NULL; | |
1969 | if (newa != olda) | |
1970 | { | |
712d2297 | 1971 | error_at (input_location, "%<gnu_inline%> attribute present on %q+D", |
1972 | newa ? newdecl : olddecl); | |
1973 | error_at (DECL_SOURCE_LOCATION (newa ? olddecl : newdecl), | |
1974 | "but not here"); | |
541e4101 | 1975 | } |
1976 | } | |
51ef3909 | 1977 | } |
679bf177 | 1978 | else if (TREE_CODE (newdecl) == VAR_DECL) |
31ddae9f | 1979 | { |
679bf177 | 1980 | /* Only variables can be thread-local, and all declarations must |
1981 | agree on this property. */ | |
1e8e9920 | 1982 | if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl)) |
1983 | { | |
1984 | /* Nothing to check. Since OLDDECL is marked threadprivate | |
1985 | and NEWDECL does not have a thread-local attribute, we | |
1986 | will merge the threadprivate attribute into NEWDECL. */ | |
1987 | ; | |
1988 | } | |
1989 | else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)) | |
51ef3909 | 1990 | { |
1b53eb20 | 1991 | if (DECL_THREAD_LOCAL_P (newdecl)) |
3cf8b391 | 1992 | error ("thread-local declaration of %q+D follows " |
1993 | "non-thread-local declaration", newdecl); | |
679bf177 | 1994 | else |
3cf8b391 | 1995 | error ("non-thread-local declaration of %q+D follows " |
1996 | "thread-local declaration", newdecl); | |
51ef3909 | 1997 | |
a52d5726 | 1998 | locate_old_decl (olddecl); |
679bf177 | 1999 | return false; |
2000 | } | |
51ef3909 | 2001 | |
679bf177 | 2002 | /* Multiple initialized definitions are not allowed (6.9p3,5). */ |
2003 | if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl)) | |
2004 | { | |
3cf8b391 | 2005 | error ("redefinition of %q+D", newdecl); |
a52d5726 | 2006 | locate_old_decl (olddecl); |
679bf177 | 2007 | return false; |
2008 | } | |
2009 | ||
4194491a | 2010 | /* Objects declared at file scope: if the first declaration had |
2011 | external linkage (even if it was an external reference) the | |
2012 | second must have external linkage as well, or the behavior is | |
2013 | undefined. If the first declaration had internal linkage, then | |
2014 | the second must too, or else be an external reference (in which | |
2015 | case the composite declaration still has internal linkage). | |
2016 | As for function declarations, we warn about the static-then- | |
2017 | extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */ | |
2018 | if (DECL_FILE_SCOPE_P (newdecl) | |
2019 | && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl)) | |
679bf177 | 2020 | { |
4194491a | 2021 | if (DECL_EXTERNAL (newdecl)) |
2022 | { | |
f23d7b7f | 2023 | if (!DECL_FILE_SCOPE_P (olddecl)) |
2024 | { | |
3cf8b391 | 2025 | error ("extern declaration of %q+D follows " |
2026 | "declaration with no linkage", newdecl); | |
a52d5726 | 2027 | locate_old_decl (olddecl); |
f23d7b7f | 2028 | return false; |
2029 | } | |
2030 | else if (warn_traditional) | |
4194491a | 2031 | { |
48e1416a | 2032 | warned |= warning (OPT_Wtraditional, |
a52d5726 | 2033 | "non-static declaration of %q+D " |
2034 | "follows static declaration", newdecl); | |
4194491a | 2035 | } |
2036 | } | |
2037 | else | |
679bf177 | 2038 | { |
2039 | if (TREE_PUBLIC (newdecl)) | |
3cf8b391 | 2040 | error ("non-static declaration of %q+D follows " |
2041 | "static declaration", newdecl); | |
679bf177 | 2042 | else |
3cf8b391 | 2043 | error ("static declaration of %q+D follows " |
2044 | "non-static declaration", newdecl); | |
679bf177 | 2045 | |
a52d5726 | 2046 | locate_old_decl (olddecl); |
679bf177 | 2047 | return false; |
51ef3909 | 2048 | } |
2049 | } | |
679bf177 | 2050 | /* Two objects with the same name declared at the same block |
2051 | scope must both be external references (6.7p3). */ | |
f23d7b7f | 2052 | else if (!DECL_FILE_SCOPE_P (newdecl)) |
679bf177 | 2053 | { |
2054 | if (DECL_EXTERNAL (newdecl)) | |
606a02e3 | 2055 | { |
2056 | /* Extern with initializer at block scope, which will | |
2057 | already have received an error. */ | |
2058 | } | |
679bf177 | 2059 | else if (DECL_EXTERNAL (olddecl)) |
606a02e3 | 2060 | { |
3cf8b391 | 2061 | error ("declaration of %q+D with no linkage follows " |
2062 | "extern declaration", newdecl); | |
a52d5726 | 2063 | locate_old_decl (olddecl); |
606a02e3 | 2064 | } |
679bf177 | 2065 | else |
606a02e3 | 2066 | { |
3cf8b391 | 2067 | error ("redeclaration of %q+D with no linkage", newdecl); |
a52d5726 | 2068 | locate_old_decl (olddecl); |
606a02e3 | 2069 | } |
5389807a | 2070 | |
679bf177 | 2071 | return false; |
2072 | } | |
b91bd472 | 2073 | |
2074 | /* C++ does not permit a decl to appear multiple times at file | |
2075 | scope. */ | |
2076 | if (warn_cxx_compat | |
2077 | && DECL_FILE_SCOPE_P (newdecl) | |
2078 | && !DECL_EXTERNAL (newdecl) | |
2079 | && !DECL_EXTERNAL (olddecl)) | |
2080 | warned |= warning_at (DECL_SOURCE_LOCATION (newdecl), | |
2081 | OPT_Wc___compat, | |
2082 | ("duplicate declaration of %qD is " | |
2083 | "invalid in C++"), | |
2084 | newdecl); | |
1806a3da | 2085 | } |
679bf177 | 2086 | |
2087 | /* warnings */ | |
b212f378 | 2088 | /* All decls must agree on a visibility. */ |
a0c938f0 | 2089 | if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS) |
5ded8c6f | 2090 | && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl) |
679bf177 | 2091 | && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl)) |
1806a3da | 2092 | { |
a52d5726 | 2093 | warned |= warning (0, "redeclaration of %q+D with different visibility " |
2094 | "(old visibility preserved)", newdecl); | |
1806a3da | 2095 | } |
679bf177 | 2096 | |
2097 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
51ef3909 | 2098 | { |
679bf177 | 2099 | /* Diagnose inline __attribute__ ((noinline)) which is silly. */ |
2100 | if (DECL_DECLARED_INLINE_P (newdecl) | |
2101 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl))) | |
4a026b48 | 2102 | warned |= warning (OPT_Wattributes, |
2103 | "inline declaration of %qD follows " | |
2104 | "declaration with attribute noinline", newdecl); | |
679bf177 | 2105 | else if (DECL_DECLARED_INLINE_P (olddecl) |
2106 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl))) | |
4a026b48 | 2107 | warned |= warning (OPT_Wattributes, |
2108 | "declaration of %q+D with attribute " | |
2109 | "noinline follows inline declaration ", newdecl); | |
2110 | else if (lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)) | |
2111 | && lookup_attribute ("always_inline", DECL_ATTRIBUTES (olddecl))) | |
2112 | warned |= warning (OPT_Wattributes, | |
2113 | "declaration of %q+D with attribute " | |
2114 | "%qs follows declaration with attribute %qs", | |
2115 | newdecl, "noinline", "always_inline"); | |
2116 | else if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (newdecl)) | |
2117 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl))) | |
2118 | warned |= warning (OPT_Wattributes, | |
2119 | "declaration of %q+D with attribute " | |
2120 | "%qs follows declaration with attribute %qs", | |
2121 | newdecl, "always_inline", "noinline"); | |
2122 | else if (lookup_attribute ("cold", DECL_ATTRIBUTES (newdecl)) | |
2123 | && lookup_attribute ("hot", DECL_ATTRIBUTES (olddecl))) | |
2124 | warned |= warning (OPT_Wattributes, | |
2125 | "declaration of %q+D with attribute %qs follows " | |
2126 | "declaration with attribute %qs", newdecl, "cold", | |
2127 | "hot"); | |
2128 | else if (lookup_attribute ("hot", DECL_ATTRIBUTES (newdecl)) | |
2129 | && lookup_attribute ("cold", DECL_ATTRIBUTES (olddecl))) | |
2130 | warned |= warning (OPT_Wattributes, | |
2131 | "declaration of %q+D with attribute %qs follows " | |
2132 | "declaration with attribute %qs", newdecl, "hot", | |
2133 | "cold"); | |
679bf177 | 2134 | } |
93d30214 | 2135 | else /* PARM_DECL, VAR_DECL */ |
679bf177 | 2136 | { |
393b349a | 2137 | /* Redeclaration of a parameter is a constraint violation (this is |
2138 | not explicitly stated, but follows from C99 6.7p3 [no more than | |
2139 | one declaration of the same identifier with no linkage in the | |
2140 | same scope, except type tags] and 6.2.2p6 [parameters have no | |
2141 | linkage]). We must check for a forward parameter declaration, | |
2142 | indicated by TREE_ASM_WRITTEN on the old declaration - this is | |
2143 | an extension, the mandatory diagnostic for which is handled by | |
2144 | mark_forward_parm_decls. */ | |
2145 | ||
93d30214 | 2146 | if (TREE_CODE (newdecl) == PARM_DECL |
2147 | && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl))) | |
2148 | { | |
3cf8b391 | 2149 | error ("redefinition of parameter %q+D", newdecl); |
a52d5726 | 2150 | locate_old_decl (olddecl); |
93d30214 | 2151 | return false; |
2152 | } | |
51ef3909 | 2153 | } |
2154 | ||
679bf177 | 2155 | /* Optional warning for completely redundant decls. */ |
2156 | if (!warned && !pedwarned | |
2157 | && warn_redundant_decls | |
2158 | /* Don't warn about a function declaration followed by a | |
2159 | definition. */ | |
93d30214 | 2160 | && !(TREE_CODE (newdecl) == FUNCTION_DECL |
2161 | && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)) | |
fbf0afd1 | 2162 | /* Don't warn about redundant redeclarations of builtins. */ |
18eb56cd | 2163 | && !(TREE_CODE (newdecl) == FUNCTION_DECL |
2164 | && !DECL_BUILT_IN (newdecl) | |
2165 | && DECL_BUILT_IN (olddecl) | |
2166 | && !C_DECL_DECLARED_BUILTIN (olddecl)) | |
93d30214 | 2167 | /* Don't warn about an extern followed by a definition. */ |
2168 | && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl)) | |
2169 | /* Don't warn about forward parameter decls. */ | |
2170 | && !(TREE_CODE (newdecl) == PARM_DECL | |
f5963a54 | 2171 | && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)) |
2172 | /* Don't warn about a variable definition following a declaration. */ | |
2173 | && !(TREE_CODE (newdecl) == VAR_DECL | |
2174 | && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))) | |
ca9d77da | 2175 | { |
a52d5726 | 2176 | warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D", |
2177 | newdecl); | |
ca9d77da | 2178 | } |
2179 | ||
a52d5726 | 2180 | /* Report location of previous decl/defn. */ |
679bf177 | 2181 | if (warned || pedwarned) |
a52d5726 | 2182 | locate_old_decl (olddecl); |
68547c04 | 2183 | |
c195b9ad | 2184 | #undef DECL_EXTERN_INLINE |
2185 | ||
67be63e6 | 2186 | return retval; |
679bf177 | 2187 | } |
51ef3909 | 2188 | |
679bf177 | 2189 | /* Subroutine of duplicate_decls. NEWDECL has been found to be |
2190 | consistent with OLDDECL, but carries new information. Merge the | |
b41346d4 | 2191 | new information into OLDDECL. This function issues no |
679bf177 | 2192 | diagnostics. */ |
2193 | ||
2194 | static void | |
b41346d4 | 2195 | merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype) |
679bf177 | 2196 | { |
c42cc79e | 2197 | bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL |
2198 | && DECL_INITIAL (newdecl) != 0); | |
2199 | bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL | |
a36cf284 | 2200 | && prototype_p (TREE_TYPE (newdecl))); |
c42cc79e | 2201 | bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL |
a36cf284 | 2202 | && prototype_p (TREE_TYPE (olddecl))); |
679bf177 | 2203 | |
393b349a | 2204 | /* For real parm decl following a forward decl, rechain the old decl |
2205 | in its new location and clear TREE_ASM_WRITTEN (it's not a | |
2206 | forward decl anymore). */ | |
679bf177 | 2207 | if (TREE_CODE (newdecl) == PARM_DECL |
84166705 | 2208 | && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)) |
51ef3909 | 2209 | { |
393b349a | 2210 | struct c_binding *b, **here; |
2211 | ||
2212 | for (here = ¤t_scope->bindings; *here; here = &(*here)->prev) | |
2213 | if ((*here)->decl == olddecl) | |
2214 | goto found; | |
231bd014 | 2215 | gcc_unreachable (); |
393b349a | 2216 | |
2217 | found: | |
2218 | b = *here; | |
2219 | *here = b->prev; | |
2220 | b->prev = current_scope->bindings; | |
2221 | current_scope->bindings = b; | |
2222 | ||
679bf177 | 2223 | TREE_ASM_WRITTEN (olddecl) = 0; |
679bf177 | 2224 | } |
2225 | ||
2226 | DECL_ATTRIBUTES (newdecl) | |
883b2e73 | 2227 | = targetm.merge_decl_attributes (olddecl, newdecl); |
b33f0698 | 2228 | |
679bf177 | 2229 | /* Merge the data types specified in the two decls. */ |
b41346d4 | 2230 | TREE_TYPE (newdecl) |
2231 | = TREE_TYPE (olddecl) | |
1ea7fa60 | 2232 | = composite_type (newtype, oldtype); |
51ef3909 | 2233 | |
679bf177 | 2234 | /* Lay the type out, unless already done. */ |
dd078265 | 2235 | if (!comptypes (oldtype, TREE_TYPE (newdecl))) |
679bf177 | 2236 | { |
2237 | if (TREE_TYPE (newdecl) != error_mark_node) | |
2238 | layout_type (TREE_TYPE (newdecl)); | |
2239 | if (TREE_CODE (newdecl) != FUNCTION_DECL | |
2240 | && TREE_CODE (newdecl) != TYPE_DECL | |
2241 | && TREE_CODE (newdecl) != CONST_DECL) | |
2242 | layout_decl (newdecl, 0); | |
2243 | } | |
2244 | else | |
2245 | { | |
2246 | /* Since the type is OLDDECL's, make OLDDECL's size go with. */ | |
2247 | DECL_SIZE (newdecl) = DECL_SIZE (olddecl); | |
2248 | DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl); | |
2249 | DECL_MODE (newdecl) = DECL_MODE (olddecl); | |
097b5c8b | 2250 | if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl)) |
2251 | { | |
2252 | DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl); | |
5f398d1f | 2253 | DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl); |
097b5c8b | 2254 | } |
679bf177 | 2255 | } |
2af4bc7b | 2256 | |
54d7a10c | 2257 | /* Keep the old rtl since we can safely use it. */ |
2258 | if (HAS_RTL_P (olddecl)) | |
2259 | COPY_DECL_RTL (olddecl, newdecl); | |
b8e0d419 | 2260 | |
679bf177 | 2261 | /* Merge the type qualifiers. */ |
2262 | if (TREE_READONLY (newdecl)) | |
b41346d4 | 2263 | TREE_READONLY (olddecl) = 1; |
50333348 | 2264 | |
679bf177 | 2265 | if (TREE_THIS_VOLATILE (newdecl)) |
ebef29eb | 2266 | TREE_THIS_VOLATILE (olddecl) = 1; |
679bf177 | 2267 | |
df4d0ece | 2268 | /* Merge deprecatedness. */ |
2269 | if (TREE_DEPRECATED (newdecl)) | |
2270 | TREE_DEPRECATED (olddecl) = 1; | |
2271 | ||
6a1a89a6 | 2272 | /* If a decl is in a system header and the other isn't, keep the one on the |
2273 | system header. Otherwise, keep source location of definition rather than | |
2274 | declaration and of prototype rather than non-prototype unless that | |
2275 | prototype is built-in. */ | |
2276 | if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS) | |
2277 | && DECL_IN_SYSTEM_HEADER (olddecl) | |
2278 | && !DECL_IN_SYSTEM_HEADER (newdecl) ) | |
bdbc474b | 2279 | DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl); |
6a1a89a6 | 2280 | else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS) |
2281 | && DECL_IN_SYSTEM_HEADER (newdecl) | |
2282 | && !DECL_IN_SYSTEM_HEADER (olddecl)) | |
bdbc474b | 2283 | DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl); |
6a1a89a6 | 2284 | else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0) |
2285 | || (old_is_prototype && !new_is_prototype | |
2286 | && !C_DECL_BUILTIN_PROTOTYPE (olddecl))) | |
679bf177 | 2287 | DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl); |
2288 | ||
679bf177 | 2289 | /* Merge the initialization information. */ |
b41346d4 | 2290 | if (DECL_INITIAL (newdecl) == 0) |
679bf177 | 2291 | DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl); |
2292 | ||
1e8e9920 | 2293 | /* Merge the threadprivate attribute. */ |
2294 | if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl)) | |
2295 | { | |
5e68df57 | 2296 | set_decl_tls_model (newdecl, DECL_TLS_MODEL (olddecl)); |
1e8e9920 | 2297 | C_DECL_THREADPRIVATE_P (newdecl) = 1; |
2298 | } | |
2299 | ||
098b24b8 | 2300 | if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)) |
2301 | { | |
098b24b8 | 2302 | /* Merge the section attribute. |
2303 | We want to issue an error if the sections conflict but that | |
2304 | must be done later in decl_attributes since we are called | |
2305 | before attributes are assigned. */ | |
71e19e54 | 2306 | if ((DECL_EXTERNAL (olddecl) || TREE_PUBLIC (olddecl) || TREE_STATIC (olddecl)) |
738a6bda | 2307 | && DECL_SECTION_NAME (newdecl) == NULL |
71e19e54 | 2308 | && DECL_SECTION_NAME (olddecl)) |
2309 | set_decl_section_name (newdecl, DECL_SECTION_NAME (olddecl)); | |
098b24b8 | 2310 | |
2311 | /* Copy the assembler name. | |
2312 | Currently, it can only be defined in the prototype. */ | |
2313 | COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl); | |
2314 | ||
2315 | /* Use visibility of whichever declaration had it specified */ | |
2316 | if (DECL_VISIBILITY_SPECIFIED (olddecl)) | |
2317 | { | |
2318 | DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl); | |
2319 | DECL_VISIBILITY_SPECIFIED (newdecl) = 1; | |
2320 | } | |
2321 | ||
2322 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2323 | { | |
2324 | DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl); | |
2325 | DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl); | |
2326 | DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl); | |
2327 | DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl) | |
2328 | |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl); | |
2329 | TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl); | |
098b24b8 | 2330 | DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl); |
68d6de5b | 2331 | DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl); |
9c2a0c05 | 2332 | TREE_READONLY (newdecl) |= TREE_READONLY (olddecl); |
2333 | DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl); | |
098b24b8 | 2334 | DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl); |
2335 | } | |
2336 | ||
2337 | /* Merge the storage class information. */ | |
2338 | merge_weak (newdecl, olddecl); | |
2339 | ||
2340 | /* For functions, static overrides non-static. */ | |
2341 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2342 | { | |
2343 | TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl); | |
2344 | /* This is since we don't automatically | |
2345 | copy the attributes of NEWDECL into OLDDECL. */ | |
2346 | TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl); | |
2347 | /* If this clears `static', clear it in the identifier too. */ | |
2348 | if (!TREE_PUBLIC (olddecl)) | |
2349 | TREE_PUBLIC (DECL_NAME (olddecl)) = 0; | |
2350 | } | |
2351 | } | |
2352 | ||
541e4101 | 2353 | /* In c99, 'extern' declaration before (or after) 'inline' means this |
2354 | function is not DECL_EXTERNAL, unless 'gnu_inline' attribute | |
2355 | is present. */ | |
2356 | if (TREE_CODE (newdecl) == FUNCTION_DECL | |
11950bdd | 2357 | && !flag_gnu89_inline |
541e4101 | 2358 | && (DECL_DECLARED_INLINE_P (newdecl) |
2359 | || DECL_DECLARED_INLINE_P (olddecl)) | |
2360 | && (!DECL_DECLARED_INLINE_P (newdecl) | |
2361 | || !DECL_DECLARED_INLINE_P (olddecl) | |
2362 | || !DECL_EXTERNAL (olddecl)) | |
2363 | && DECL_EXTERNAL (newdecl) | |
56f06eef | 2364 | && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl)) |
4d6b6a7f | 2365 | && !current_function_decl) |
541e4101 | 2366 | DECL_EXTERNAL (newdecl) = 0; |
c42cc79e | 2367 | |
75bce827 | 2368 | /* An inline definition following a static declaration is not |
2369 | DECL_EXTERNAL. */ | |
2370 | if (new_is_definition | |
2371 | && (DECL_DECLARED_INLINE_P (newdecl) | |
2372 | || DECL_DECLARED_INLINE_P (olddecl)) | |
2373 | && !TREE_PUBLIC (olddecl)) | |
2374 | DECL_EXTERNAL (newdecl) = 0; | |
2375 | ||
098b24b8 | 2376 | if (DECL_EXTERNAL (newdecl)) |
2377 | { | |
2378 | TREE_STATIC (newdecl) = TREE_STATIC (olddecl); | |
2379 | DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl); | |
2380 | ||
2381 | /* An extern decl does not override previous storage class. */ | |
2382 | TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl); | |
2383 | if (!DECL_EXTERNAL (newdecl)) | |
2384 | { | |
2385 | DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl); | |
2386 | DECL_COMMON (newdecl) = DECL_COMMON (olddecl); | |
2387 | } | |
2388 | } | |
2389 | else | |
2390 | { | |
2391 | TREE_STATIC (olddecl) = TREE_STATIC (newdecl); | |
2392 | TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl); | |
2393 | } | |
2394 | ||
2395 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2396 | { | |
2397 | /* If we're redefining a function previously defined as extern | |
2398 | inline, make sure we emit debug info for the inline before we | |
2399 | throw it away, in case it was inlined into a function that | |
2400 | hasn't been written out yet. */ | |
2401 | if (new_is_definition && DECL_INITIAL (olddecl)) | |
bef7f001 | 2402 | /* The new defn must not be inline. */ |
2403 | DECL_UNINLINABLE (newdecl) = 1; | |
098b24b8 | 2404 | else |
2405 | { | |
2406 | /* If either decl says `inline', this fn is inline, unless | |
2407 | its definition was passed already. */ | |
2408 | if (DECL_DECLARED_INLINE_P (newdecl) | |
2409 | || DECL_DECLARED_INLINE_P (olddecl)) | |
2410 | DECL_DECLARED_INLINE_P (newdecl) = 1; | |
2411 | ||
2412 | DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl) | |
2413 | = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)); | |
ebb7d626 | 2414 | |
2415 | DECL_DISREGARD_INLINE_LIMITS (newdecl) | |
2416 | = DECL_DISREGARD_INLINE_LIMITS (olddecl) | |
2417 | = (DECL_DISREGARD_INLINE_LIMITS (newdecl) | |
2418 | || DECL_DISREGARD_INLINE_LIMITS (olddecl)); | |
098b24b8 | 2419 | } |
2420 | ||
2421 | if (DECL_BUILT_IN (olddecl)) | |
2422 | { | |
2423 | /* If redeclaring a builtin function, it stays built in. | |
2424 | But it gets tagged as having been declared. */ | |
2425 | DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl); | |
2426 | DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl); | |
2427 | C_DECL_DECLARED_BUILTIN (newdecl) = 1; | |
2428 | if (new_is_prototype) | |
9efe50a4 | 2429 | { |
2430 | C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0; | |
2431 | if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL) | |
b9a16870 | 2432 | { |
2433 | enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl); | |
2434 | switch (fncode) | |
2435 | { | |
2436 | /* If a compatible prototype of these builtin functions | |
2437 | is seen, assume the runtime implements it with the | |
2438 | expected semantics. */ | |
2439 | case BUILT_IN_STPCPY: | |
2440 | if (builtin_decl_explicit_p (fncode)) | |
2441 | set_builtin_decl_implicit_p (fncode, true); | |
2442 | break; | |
2443 | default: | |
2444 | break; | |
2445 | } | |
2446 | } | |
9efe50a4 | 2447 | } |
098b24b8 | 2448 | else |
2449 | C_DECL_BUILTIN_PROTOTYPE (newdecl) | |
2450 | = C_DECL_BUILTIN_PROTOTYPE (olddecl); | |
2451 | } | |
2452 | ||
46f8e3b0 | 2453 | /* Preserve function specific target and optimization options */ |
2454 | if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl) | |
2455 | && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl)) | |
2456 | DECL_FUNCTION_SPECIFIC_TARGET (newdecl) | |
2457 | = DECL_FUNCTION_SPECIFIC_TARGET (olddecl); | |
2458 | ||
2459 | if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl) | |
2460 | && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)) | |
2461 | DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl) | |
2462 | = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl); | |
2463 | ||
098b24b8 | 2464 | /* Also preserve various other info from the definition. */ |
2465 | if (!new_is_definition) | |
2466 | { | |
14bd221c | 2467 | tree t; |
098b24b8 | 2468 | DECL_RESULT (newdecl) = DECL_RESULT (olddecl); |
2469 | DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl); | |
2470 | DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl); | |
2471 | DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl); | |
14bd221c | 2472 | DECL_ARGUMENTS (newdecl) = copy_list (DECL_ARGUMENTS (olddecl)); |
1767a056 | 2473 | for (t = DECL_ARGUMENTS (newdecl); t ; t = DECL_CHAIN (t)) |
14bd221c | 2474 | DECL_CONTEXT (t) = newdecl; |
098b24b8 | 2475 | |
81549c4d | 2476 | /* See if we've got a function to instantiate from. */ |
2477 | if (DECL_SAVED_TREE (olddecl)) | |
2478 | DECL_ABSTRACT_ORIGIN (newdecl) | |
2479 | = DECL_ABSTRACT_ORIGIN (olddecl); | |
098b24b8 | 2480 | } |
2481 | } | |
2482 | ||
da870dac | 2483 | /* Merge the USED information. */ |
2484 | if (TREE_USED (olddecl)) | |
2485 | TREE_USED (newdecl) = 1; | |
2486 | else if (TREE_USED (newdecl)) | |
2487 | TREE_USED (olddecl) = 1; | |
abc6c64f | 2488 | if (TREE_CODE (olddecl) == VAR_DECL || TREE_CODE (olddecl) == PARM_DECL) |
2489 | DECL_READ_P (newdecl) |= DECL_READ_P (olddecl); | |
5b5632f7 | 2490 | if (DECL_PRESERVE_P (olddecl)) |
2491 | DECL_PRESERVE_P (newdecl) = 1; | |
2492 | else if (DECL_PRESERVE_P (newdecl)) | |
2493 | DECL_PRESERVE_P (olddecl) = 1; | |
f901d289 | 2494 | |
098b24b8 | 2495 | /* Copy most of the decl-specific fields of NEWDECL into OLDDECL. |
58d82cd0 | 2496 | But preserve OLDDECL's DECL_UID, DECL_CONTEXT and |
2497 | DECL_ARGUMENTS (if appropriate). */ | |
41a7cb9f | 2498 | { |
19cb6b50 | 2499 | unsigned olddecl_uid = DECL_UID (olddecl); |
b3e83e1e | 2500 | tree olddecl_context = DECL_CONTEXT (olddecl); |
14bd221c | 2501 | tree olddecl_arguments = NULL; |
2502 | if (TREE_CODE (olddecl) == FUNCTION_DECL) | |
2503 | olddecl_arguments = DECL_ARGUMENTS (olddecl); | |
a0c938f0 | 2504 | |
d5130039 | 2505 | memcpy ((char *) olddecl + sizeof (struct tree_common), |
2506 | (char *) newdecl + sizeof (struct tree_common), | |
5ded8c6f | 2507 | sizeof (struct tree_decl_common) - sizeof (struct tree_common)); |
fc0d4990 | 2508 | DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl); |
5ded8c6f | 2509 | switch (TREE_CODE (olddecl)) |
2510 | { | |
75a70cf9 | 2511 | case FUNCTION_DECL: |
5ded8c6f | 2512 | case VAR_DECL: |
8c016392 | 2513 | { |
2514 | struct symtab_node *snode = olddecl->decl_with_vis.symtab_node; | |
2515 | ||
2516 | memcpy ((char *) olddecl + sizeof (struct tree_decl_common), | |
2517 | (char *) newdecl + sizeof (struct tree_decl_common), | |
2518 | tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common)); | |
2519 | olddecl->decl_with_vis.symtab_node = snode; | |
2520 | break; | |
2521 | } | |
2522 | ||
2523 | case FIELD_DECL: | |
5ded8c6f | 2524 | case PARM_DECL: |
2525 | case LABEL_DECL: | |
2526 | case RESULT_DECL: | |
2527 | case CONST_DECL: | |
2528 | case TYPE_DECL: | |
5ded8c6f | 2529 | memcpy ((char *) olddecl + sizeof (struct tree_decl_common), |
2530 | (char *) newdecl + sizeof (struct tree_decl_common), | |
2531 | tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common)); | |
2532 | break; | |
2533 | ||
2534 | default: | |
a0c938f0 | 2535 | |
5ded8c6f | 2536 | memcpy ((char *) olddecl + sizeof (struct tree_decl_common), |
2537 | (char *) newdecl + sizeof (struct tree_decl_common), | |
2538 | sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)); | |
2539 | } | |
41a7cb9f | 2540 | DECL_UID (olddecl) = olddecl_uid; |
b3e83e1e | 2541 | DECL_CONTEXT (olddecl) = olddecl_context; |
14bd221c | 2542 | if (TREE_CODE (olddecl) == FUNCTION_DECL) |
2543 | DECL_ARGUMENTS (olddecl) = olddecl_arguments; | |
41a7cb9f | 2544 | } |
51ef3909 | 2545 | |
979e2687 | 2546 | /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl |
2547 | so that encode_section_info has a chance to look at the new decl | |
2548 | flags and attributes. */ | |
2549 | if (DECL_RTL_SET_P (olddecl) | |
2550 | && (TREE_CODE (olddecl) == FUNCTION_DECL | |
2551 | || (TREE_CODE (olddecl) == VAR_DECL | |
2552 | && TREE_STATIC (olddecl)))) | |
b2c4af5e | 2553 | make_decl_rtl (olddecl); |
51ef3909 | 2554 | } |
2555 | ||
679bf177 | 2556 | /* Handle when a new declaration NEWDECL has the same name as an old |
2557 | one OLDDECL in the same binding contour. Prints an error message | |
2558 | if appropriate. | |
2559 | ||
2560 | If safely possible, alter OLDDECL to look like NEWDECL, and return | |
b41346d4 | 2561 | true. Otherwise, return false. */ |
679bf177 | 2562 | |
2563 | static bool | |
b41346d4 | 2564 | duplicate_decls (tree newdecl, tree olddecl) |
679bf177 | 2565 | { |
4ee9c684 | 2566 | tree newtype = NULL, oldtype = NULL; |
679bf177 | 2567 | |
2568 | if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype)) | |
8babbffa | 2569 | { |
b1a2195b | 2570 | /* Avoid `unused variable' and other warnings for OLDDECL. */ |
8babbffa | 2571 | TREE_NO_WARNING (olddecl) = 1; |
2572 | return false; | |
2573 | } | |
679bf177 | 2574 | |
b41346d4 | 2575 | merge_decls (newdecl, olddecl, newtype, oldtype); |
8c016392 | 2576 | |
752098c8 | 2577 | /* The NEWDECL will no longer be needed. |
2578 | ||
2579 | Before releasing the node, be sure to remove function from symbol | |
2580 | table that might have been inserted there to record comdat group. | |
2581 | Be sure to however do not free DECL_STRUCT_FUNCTION because this | |
2582 | structure is shared in between NEWDECL and OLDECL. */ | |
2583 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2584 | DECL_STRUCT_FUNCTION (newdecl) = NULL; | |
71e19e54 | 2585 | if (TREE_CODE (newdecl) == FUNCTION_DECL |
2586 | || TREE_CODE (newdecl) == VAR_DECL) | |
2587 | { | |
415d1b9a | 2588 | struct symtab_node *snode = symtab_node::get (newdecl); |
71e19e54 | 2589 | if (snode) |
415d1b9a | 2590 | snode->remove (); |
71e19e54 | 2591 | } |
8c016392 | 2592 | ggc_free (newdecl); |
b41346d4 | 2593 | return true; |
679bf177 | 2594 | } |
14338e9a | 2595 | |
679bf177 | 2596 | \f |
e85905e5 | 2597 | /* Check whether decl-node NEW_DECL shadows an existing declaration. */ |
31ddae9f | 2598 | static void |
e85905e5 | 2599 | warn_if_shadowing (tree new_decl) |
31ddae9f | 2600 | { |
393b349a | 2601 | struct c_binding *b; |
31ddae9f | 2602 | |
393b349a | 2603 | /* Shadow warnings wanted? */ |
2604 | if (!warn_shadow | |
31ddae9f | 2605 | /* No shadow warnings for internally generated vars. */ |
e85905e5 | 2606 | || DECL_IS_BUILTIN (new_decl) |
31ddae9f | 2607 | /* No shadow warnings for vars made for inlining. */ |
40c4b476 | 2608 | || DECL_FROM_INLINE (new_decl)) |
5f3cead1 | 2609 | return; |
2610 | ||
4194491a | 2611 | /* Is anything being shadowed? Invisible decls do not count. */ |
e85905e5 | 2612 | for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed) |
10a45226 | 2613 | if (b->decl && b->decl != new_decl && !b->invisible |
2614 | && (b->decl == error_mark_node | |
2615 | || diagnostic_report_warnings_p (global_dc, | |
2616 | DECL_SOURCE_LOCATION (b->decl)))) | |
393b349a | 2617 | { |
e85905e5 | 2618 | tree old_decl = b->decl; |
64cf1262 | 2619 | bool warned = false; |
393b349a | 2620 | |
d75329f0 | 2621 | if (old_decl == error_mark_node) |
2622 | { | |
e8d0745d | 2623 | warning (OPT_Wshadow, "declaration of %q+D shadows previous " |
2624 | "non-variable", new_decl); | |
d75329f0 | 2625 | break; |
2626 | } | |
2627 | else if (TREE_CODE (old_decl) == PARM_DECL) | |
64cf1262 | 2628 | warned = warning (OPT_Wshadow, |
2629 | "declaration of %q+D shadows a parameter", | |
2630 | new_decl); | |
e8d0745d | 2631 | else if (DECL_FILE_SCOPE_P (old_decl)) |
08fc5390 | 2632 | { |
2633 | /* Do not warn if a variable shadows a function, unless | |
2634 | the variable is a function or a pointer-to-function. */ | |
2635 | if (TREE_CODE (old_decl) == FUNCTION_DECL | |
2636 | && TREE_CODE (new_decl) != FUNCTION_DECL | |
2637 | && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl))) | |
2638 | continue; | |
2639 | ||
64cf1262 | 2640 | warned = warning_at (DECL_SOURCE_LOCATION (new_decl), OPT_Wshadow, |
2641 | "declaration of %qD shadows a global " | |
2642 | "declaration", | |
2643 | new_decl); | |
08fc5390 | 2644 | } |
e85905e5 | 2645 | else if (TREE_CODE (old_decl) == FUNCTION_DECL |
2646 | && DECL_BUILT_IN (old_decl)) | |
d75329f0 | 2647 | { |
e8d0745d | 2648 | warning (OPT_Wshadow, "declaration of %q+D shadows " |
2649 | "a built-in function", new_decl); | |
d75329f0 | 2650 | break; |
2651 | } | |
393b349a | 2652 | else |
64cf1262 | 2653 | warned = warning (OPT_Wshadow, "declaration of %q+D shadows a " |
2654 | "previous local", new_decl); | |
393b349a | 2655 | |
64cf1262 | 2656 | if (warned) |
2657 | inform (DECL_SOURCE_LOCATION (old_decl), | |
2658 | "shadowed declaration is here"); | |
a3ad3e27 | 2659 | |
393b349a | 2660 | break; |
2661 | } | |
31ddae9f | 2662 | } |
2663 | ||
51ef3909 | 2664 | /* Record a decl-node X as belonging to the current lexical scope. |
2665 | Check for errors (such as an incompatible declaration for the same | |
2666 | name already seen in the same scope). | |
2667 | ||
2668 | Returns either X or an old decl for the same name. | |
2669 | If an old decl is returned, it may have been smashed | |
2670 | to agree with what X says. */ | |
2671 | ||
2672 | tree | |
1cae46be | 2673 | pushdecl (tree x) |
51ef3909 | 2674 | { |
19cb6b50 | 2675 | tree name = DECL_NAME (x); |
6e899616 | 2676 | struct c_scope *scope = current_scope; |
393b349a | 2677 | struct c_binding *b; |
4194491a | 2678 | bool nested = false; |
6fb80942 | 2679 | location_t locus = DECL_SOURCE_LOCATION (x); |
51ef3909 | 2680 | |
4d714d55 | 2681 | /* Must set DECL_CONTEXT for everything not at file scope or |
2682 | DECL_FILE_SCOPE_P won't work. Local externs don't count | |
2683 | unless they have initializers (which generate code). */ | |
2684 | if (current_function_decl | |
2685 | && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL) | |
2686 | || DECL_INITIAL (x) || !DECL_EXTERNAL (x))) | |
31ddae9f | 2687 | DECL_CONTEXT (x) = current_function_decl; |
d9cf68bf | 2688 | |
393b349a | 2689 | /* Anonymous decls are just inserted in the scope. */ |
2690 | if (!name) | |
51ef3909 | 2691 | { |
6fb80942 | 2692 | bind (name, x, scope, /*invisible=*/false, /*nested=*/false, |
2693 | locus); | |
393b349a | 2694 | return x; |
2695 | } | |
2696 | ||
2697 | /* First, see if there is another declaration with the same name in | |
2698 | the current scope. If there is, duplicate_decls may do all the | |
2699 | work for us. If duplicate_decls returns false, that indicates | |
2700 | two incompatible decls in the same scope; we are to silently | |
2701 | replace the old one (duplicate_decls has issued all appropriate | |
2702 | diagnostics). In particular, we should not consider possible | |
2703 | duplicates in the external scope, or shadowing. */ | |
2704 | b = I_SYMBOL_BINDING (name); | |
4194491a | 2705 | if (b && B_IN_SCOPE (b, scope)) |
393b349a | 2706 | { |
fea849d3 | 2707 | struct c_binding *b_ext, *b_use; |
2708 | tree type = TREE_TYPE (x); | |
2709 | tree visdecl = b->decl; | |
2710 | tree vistype = TREE_TYPE (visdecl); | |
606a02e3 | 2711 | if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE |
2712 | && COMPLETE_TYPE_P (TREE_TYPE (x))) | |
2713 | b->inner_comp = false; | |
fea849d3 | 2714 | b_use = b; |
2715 | b_ext = b; | |
2716 | /* If this is an external linkage declaration, we should check | |
2717 | for compatibility with the type in the external scope before | |
2718 | setting the type at this scope based on the visible | |
2719 | information only. */ | |
2720 | if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl)) | |
2721 | { | |
2722 | while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext)) | |
2723 | b_ext = b_ext->shadowed; | |
2724 | if (b_ext) | |
2725 | { | |
2726 | b_use = b_ext; | |
f805d53d | 2727 | if (b_use->u.type) |
2728 | TREE_TYPE (b_use->decl) = b_use->u.type; | |
fea849d3 | 2729 | } |
2730 | } | |
2731 | if (duplicate_decls (x, b_use->decl)) | |
2732 | { | |
2733 | if (b_use != b) | |
2734 | { | |
2735 | /* Save the updated type in the external scope and | |
2736 | restore the proper type for this scope. */ | |
2737 | tree thistype; | |
2738 | if (comptypes (vistype, type)) | |
2739 | thistype = composite_type (vistype, type); | |
2740 | else | |
2741 | thistype = TREE_TYPE (b_use->decl); | |
f805d53d | 2742 | b_use->u.type = TREE_TYPE (b_use->decl); |
fea849d3 | 2743 | if (TREE_CODE (b_use->decl) == FUNCTION_DECL |
2744 | && DECL_BUILT_IN (b_use->decl)) | |
2745 | thistype | |
2746 | = build_type_attribute_variant (thistype, | |
2747 | TYPE_ATTRIBUTES | |
f805d53d | 2748 | (b_use->u.type)); |
fea849d3 | 2749 | TREE_TYPE (b_use->decl) = thistype; |
2750 | } | |
2751 | return b_use->decl; | |
2752 | } | |
393b349a | 2753 | else |
2754 | goto skip_external_and_shadow_checks; | |
2755 | } | |
2756 | ||
2757 | /* All declarations with external linkage, and all external | |
2758 | references, go in the external scope, no matter what scope is | |
2759 | current. However, the binding in that scope is ignored for | |
2760 | purposes of normal name lookup. A separate binding structure is | |
2761 | created in the requested scope; this governs the normal | |
2762 | visibility of the symbol. | |
51ef3909 | 2763 | |
393b349a | 2764 | The binding in the externals scope is used exclusively for |
2765 | detecting duplicate declarations of the same object, no matter | |
2766 | what scope they are in; this is what we do here. (C99 6.2.7p2: | |
2767 | All declarations that refer to the same object or function shall | |
2768 | have compatible type; otherwise, the behavior is undefined.) */ | |
2769 | if (DECL_EXTERNAL (x) || scope == file_scope) | |
2770 | { | |
606a02e3 | 2771 | tree type = TREE_TYPE (x); |
2772 | tree vistype = 0; | |
2773 | tree visdecl = 0; | |
2774 | bool type_saved = false; | |
2775 | if (b && !B_IN_EXTERNAL_SCOPE (b) | |
2776 | && (TREE_CODE (b->decl) == FUNCTION_DECL | |
2777 | || TREE_CODE (b->decl) == VAR_DECL) | |
2778 | && DECL_FILE_SCOPE_P (b->decl)) | |
2779 | { | |
2780 | visdecl = b->decl; | |
2781 | vistype = TREE_TYPE (visdecl); | |
2782 | } | |
6bf97f82 | 2783 | if (scope != file_scope |
94cb93b3 | 2784 | && !DECL_IN_SYSTEM_HEADER (x)) |
6bf97f82 | 2785 | warning (OPT_Wnested_externs, "nested extern declaration of %qD", x); |
94cb93b3 | 2786 | |
4194491a | 2787 | while (b && !B_IN_EXTERNAL_SCOPE (b)) |
606a02e3 | 2788 | { |
2789 | /* If this decl might be modified, save its type. This is | |
2790 | done here rather than when the decl is first bound | |
2791 | because the type may change after first binding, through | |
2792 | being completed or through attributes being added. If we | |
2793 | encounter multiple such decls, only the first should have | |
2794 | its type saved; the others will already have had their | |
2795 | proper types saved and the types will not have changed as | |
2796 | their scopes will not have been re-entered. */ | |
d75329f0 | 2797 | if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved) |
606a02e3 | 2798 | { |
f805d53d | 2799 | b->u.type = TREE_TYPE (b->decl); |
606a02e3 | 2800 | type_saved = true; |
2801 | } | |
2802 | if (B_IN_FILE_SCOPE (b) | |
2803 | && TREE_CODE (b->decl) == VAR_DECL | |
2804 | && TREE_STATIC (b->decl) | |
2805 | && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE | |
2806 | && !TYPE_DOMAIN (TREE_TYPE (b->decl)) | |
2807 | && TREE_CODE (type) == ARRAY_TYPE | |
2808 | && TYPE_DOMAIN (type) | |
2809 | && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) | |
2810 | && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type)))) | |
2811 | { | |
2812 | /* Array type completed in inner scope, which should be | |
2813 | diagnosed if the completion does not have size 1 and | |
2814 | it does not get completed in the file scope. */ | |
2815 | b->inner_comp = true; | |
2816 | } | |
2817 | b = b->shadowed; | |
2818 | } | |
2819 | ||
2820 | /* If a matching external declaration has been found, set its | |
2821 | type to the composite of all the types of that declaration. | |
2822 | After the consistency checks, it will be reset to the | |
2823 | composite of the visible types only. */ | |
2824 | if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl)) | |
f805d53d | 2825 | && b->u.type) |
2826 | TREE_TYPE (b->decl) = b->u.type; | |
393b349a | 2827 | |
2828 | /* The point of the same_translation_unit_p check here is, | |
2829 | we want to detect a duplicate decl for a construct like | |
2830 | foo() { extern bar(); } ... static bar(); but not if | |
2831 | they are in different translation units. In any case, | |
2832 | the static does not go in the externals scope. */ | |
2833 | if (b | |
b3e83e1e | 2834 | && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl)) |
393b349a | 2835 | && duplicate_decls (x, b->decl)) |
f74be9a1 | 2836 | { |
606a02e3 | 2837 | tree thistype; |
fea849d3 | 2838 | if (vistype) |
2839 | { | |
2840 | if (comptypes (vistype, type)) | |
2841 | thistype = composite_type (vistype, type); | |
2842 | else | |
2843 | thistype = TREE_TYPE (b->decl); | |
2844 | } | |
2845 | else | |
2846 | thistype = type; | |
f805d53d | 2847 | b->u.type = TREE_TYPE (b->decl); |
606a02e3 | 2848 | if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl)) |
2849 | thistype | |
2850 | = build_type_attribute_variant (thistype, | |
f805d53d | 2851 | TYPE_ATTRIBUTES (b->u.type)); |
606a02e3 | 2852 | TREE_TYPE (b->decl) = thistype; |
6fb80942 | 2853 | bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true, |
2854 | locus); | |
393b349a | 2855 | return b->decl; |
f74be9a1 | 2856 | } |
b3e83e1e | 2857 | else if (TREE_PUBLIC (x)) |
4214af46 | 2858 | { |
606a02e3 | 2859 | if (visdecl && !b && duplicate_decls (x, visdecl)) |
2860 | { | |
2861 | /* An external declaration at block scope referring to a | |
2862 | visible entity with internal linkage. The composite | |
2863 | type will already be correct for this scope, so we | |
2864 | just need to fall through to make the declaration in | |
2865 | this scope. */ | |
2866 | nested = true; | |
2d7a881f | 2867 | x = visdecl; |
606a02e3 | 2868 | } |
2869 | else | |
2870 | { | |
2871 | bind (name, x, external_scope, /*invisible=*/true, | |
6fb80942 | 2872 | /*nested=*/false, locus); |
606a02e3 | 2873 | nested = true; |
2874 | } | |
51ef3909 | 2875 | } |
393b349a | 2876 | } |
1cae46be | 2877 | |
40c4b476 | 2878 | if (TREE_CODE (x) != PARM_DECL) |
2879 | warn_if_shadowing (x); | |
51ef3909 | 2880 | |
393b349a | 2881 | skip_external_and_shadow_checks: |
2882 | if (TREE_CODE (x) == TYPE_DECL) | |
a4e3ffad | 2883 | { |
2884 | /* So this is a typedef, set its underlying type. */ | |
2885 | set_underlying_type (x); | |
2886 | ||
2887 | /* If X is a typedef defined in the current function, record it | |
2888 | for the purpose of implementing the -Wunused-local-typedefs | |
2889 | warning. */ | |
2890 | record_locally_defined_typedef (x); | |
2891 | } | |
51ef3909 | 2892 | |
6fb80942 | 2893 | bind (name, x, scope, /*invisible=*/false, nested, locus); |
393b349a | 2894 | |
2895 | /* If x's type is incomplete because it's based on a | |
2896 | structure or union which has not yet been fully declared, | |
2897 | attach it to that structure or union type, so we can go | |
2898 | back and complete the variable declaration later, if the | |
2899 | structure or union gets fully declared. | |
51ef3909 | 2900 | |
393b349a | 2901 | If the input is erroneous, we can have error_mark in the type |
2902 | slot (e.g. "f(void a, ...)") - that doesn't count as an | |
2903 | incomplete type. */ | |
2904 | if (TREE_TYPE (x) != error_mark_node | |
2905 | && !COMPLETE_TYPE_P (TREE_TYPE (x))) | |
2906 | { | |
2907 | tree element = TREE_TYPE (x); | |
2908 | ||
2909 | while (TREE_CODE (element) == ARRAY_TYPE) | |
2910 | element = TREE_TYPE (element); | |
2911 | element = TYPE_MAIN_VARIANT (element); | |
2912 | ||
2913 | if ((TREE_CODE (element) == RECORD_TYPE | |
2914 | || TREE_CODE (element) == UNION_TYPE) | |
2915 | && (TREE_CODE (x) != TYPE_DECL | |
2916 | || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE) | |
2917 | && !COMPLETE_TYPE_P (element)) | |
2918 | C_TYPE_INCOMPLETE_VARS (element) | |
2919 | = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element)); | |
2920 | } | |
51ef3909 | 2921 | return x; |
2922 | } | |
2923 | ||
393b349a | 2924 | /* Record X as belonging to file scope. |
7ef5b942 | 2925 | This is used only internally by the Objective-C front end, |
3bdb6310 | 2926 | and is limited to its needs. duplicate_decls is not called; |
2927 | if there is any preexisting decl for this identifier, it is an ICE. */ | |
2928 | ||
31ddae9f | 2929 | tree |
1cae46be | 2930 | pushdecl_top_level (tree x) |
4124ea8b | 2931 | { |
3bdb6310 | 2932 | tree name; |
4194491a | 2933 | bool nested = false; |
6e030094 | 2934 | gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL); |
31ddae9f | 2935 | |
2936 | name = DECL_NAME (x); | |
31ddae9f | 2937 | |
6e030094 | 2938 | gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name)); |
4124ea8b | 2939 | |
b3e83e1e | 2940 | if (TREE_PUBLIC (x)) |
393b349a | 2941 | { |
6fb80942 | 2942 | bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false, |
2943 | UNKNOWN_LOCATION); | |
4194491a | 2944 | nested = true; |
393b349a | 2945 | } |
2946 | if (file_scope) | |
6fb80942 | 2947 | bind (name, x, file_scope, /*invisible=*/false, nested, UNKNOWN_LOCATION); |
51ef3909 | 2948 | |
3bdb6310 | 2949 | return x; |
51ef3909 | 2950 | } |
2951 | \f | |
393b349a | 2952 | static void |
f9767fb6 | 2953 | implicit_decl_warning (location_t loc, tree id, tree olddecl) |
393b349a | 2954 | { |
3ba510aa | 2955 | if (warn_implicit_function_declaration) |
393b349a | 2956 | { |
a52d5726 | 2957 | bool warned; |
2958 | ||
3ba510aa | 2959 | if (flag_isoc99) |
f9767fb6 | 2960 | warned = pedwarn (loc, OPT_Wimplicit_function_declaration, |
21ca8540 | 2961 | "implicit declaration of function %qE", id); |
48e1416a | 2962 | else |
f9767fb6 | 2963 | warned = warning_at (loc, OPT_Wimplicit_function_declaration, |
2964 | G_("implicit declaration of function %qE"), id); | |
a52d5726 | 2965 | if (olddecl && warned) |
2966 | locate_old_decl (olddecl); | |
393b349a | 2967 | } |
393b349a | 2968 | } |
2969 | ||
e60a6f7b | 2970 | /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a |
31ddae9f | 2971 | function of type int (). */ |
51ef3909 | 2972 | |
2973 | tree | |
e60a6f7b | 2974 | implicitly_declare (location_t loc, tree functionid) |
51ef3909 | 2975 | { |
606a02e3 | 2976 | struct c_binding *b; |
2977 | tree decl = 0; | |
f3e21791 | 2978 | tree asmspec_tree; |
2979 | ||
606a02e3 | 2980 | for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed) |
2981 | { | |
2982 | if (B_IN_SCOPE (b, external_scope)) | |
2983 | { | |
2984 | decl = b->decl; | |
2985 | break; | |
2986 | } | |
2987 | } | |
51ef3909 | 2988 | |
3bdb6310 | 2989 | if (decl) |
31ddae9f | 2990 | { |
d75329f0 | 2991 | if (decl == error_mark_node) |
2992 | return decl; | |
2993 | ||
393b349a | 2994 | /* FIXME: Objective-C has weird not-really-builtin functions |
2995 | which are supposed to be visible automatically. They wind up | |
2996 | in the external scope because they're pushed before the file | |
2997 | scope gets created. Catch this here and rebind them into the | |
2998 | file scope. */ | |
9a6486a6 | 2999 | if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl)) |
393b349a | 3000 | { |
4194491a | 3001 | bind (functionid, decl, file_scope, |
6fb80942 | 3002 | /*invisible=*/false, /*nested=*/true, |
3003 | DECL_SOURCE_LOCATION (decl)); | |
393b349a | 3004 | return decl; |
3005 | } | |
3006 | else | |
31ddae9f | 3007 | { |
606a02e3 | 3008 | tree newtype = default_function_type; |
f805d53d | 3009 | if (b->u.type) |
3010 | TREE_TYPE (decl) = b->u.type; | |
393b349a | 3011 | /* Implicit declaration of a function already declared |
3012 | (somehow) in a different scope, or as a built-in. | |
3013 | If this is the first time this has happened, warn; | |
606a02e3 | 3014 | then recycle the old declaration but with the new type. */ |
393b349a | 3015 | if (!C_DECL_IMPLICIT (decl)) |
3016 | { | |
f9767fb6 | 3017 | implicit_decl_warning (loc, functionid, decl); |
393b349a | 3018 | C_DECL_IMPLICIT (decl) = 1; |
3019 | } | |
0568d4ea | 3020 | if (DECL_BUILT_IN (decl)) |
3021 | { | |
606a02e3 | 3022 | newtype = build_type_attribute_variant (newtype, |
3023 | TYPE_ATTRIBUTES | |
3024 | (TREE_TYPE (decl))); | |
3025 | if (!comptypes (newtype, TREE_TYPE (decl))) | |
0568d4ea | 3026 | { |
e60a6f7b | 3027 | warning_at (loc, 0, "incompatible implicit declaration of " |
3028 | "built-in function %qD", decl); | |
606a02e3 | 3029 | newtype = TREE_TYPE (decl); |
0568d4ea | 3030 | } |
3031 | } | |
3032 | else | |
3033 | { | |
606a02e3 | 3034 | if (!comptypes (newtype, TREE_TYPE (decl))) |
0568d4ea | 3035 | { |
e60a6f7b | 3036 | error_at (loc, "incompatible implicit declaration of function %qD", decl); |
a52d5726 | 3037 | locate_old_decl (decl); |
0568d4ea | 3038 | } |
3039 | } | |
f805d53d | 3040 | b->u.type = TREE_TYPE (decl); |
606a02e3 | 3041 | TREE_TYPE (decl) = newtype; |
4194491a | 3042 | bind (functionid, decl, current_scope, |
6fb80942 | 3043 | /*invisible=*/false, /*nested=*/true, |
3044 | DECL_SOURCE_LOCATION (decl)); | |
393b349a | 3045 | return decl; |
31ddae9f | 3046 | } |
31ddae9f | 3047 | } |
51ef3909 | 3048 | |
31ddae9f | 3049 | /* Not seen before. */ |
e60a6f7b | 3050 | decl = build_decl (loc, FUNCTION_DECL, functionid, default_function_type); |
5e58c22e | 3051 | DECL_EXTERNAL (decl) = 1; |
51ef3909 | 3052 | TREE_PUBLIC (decl) = 1; |
31ddae9f | 3053 | C_DECL_IMPLICIT (decl) = 1; |
f9767fb6 | 3054 | implicit_decl_warning (loc, functionid, 0); |
f3e21791 | 3055 | asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL); |
3056 | if (asmspec_tree) | |
3057 | set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree)); | |
51ef3909 | 3058 | |
b3924a2c | 3059 | /* C89 says implicit declarations are in the innermost block. |
455730ef | 3060 | So we record the decl in the standard fashion. */ |
31ddae9f | 3061 | decl = pushdecl (decl); |
51ef3909 | 3062 | |
31ddae9f | 3063 | /* No need to call objc_check_decl here - it's a function type. */ |
b2c4af5e | 3064 | rest_of_decl_compilation (decl, 0, 0); |
51ef3909 | 3065 | |
b3924a2c | 3066 | /* Write a record describing this implicit function declaration |
3067 | to the prototypes file (if requested). */ | |
51ef3909 | 3068 | gen_aux_info_record (decl, 0, 1, 0); |
3069 | ||
7d3b509a | 3070 | /* Possibly apply some default attributes to this implicit declaration. */ |
3071 | decl_attributes (&decl, NULL_TREE, 0); | |
3072 | ||
51ef3909 | 3073 | return decl; |
3074 | } | |
3075 | ||
a0c21e2b | 3076 | /* Issue an error message for a reference to an undeclared variable |
3077 | ID, including a reference to a builtin outside of function-call | |
3078 | context. Establish a binding of the identifier to error_mark_node | |
3079 | in an appropriate scope, which will suppress further errors for the | |
8dc938b9 | 3080 | same identifier. The error message should be given location LOC. */ |
a0c21e2b | 3081 | void |
e60a6f7b | 3082 | undeclared_variable (location_t loc, tree id) |
a0c21e2b | 3083 | { |
3084 | static bool already = false; | |
3bdb6310 | 3085 | struct c_scope *scope; |
a0c21e2b | 3086 | |
3087 | if (current_function_decl == 0) | |
3088 | { | |
5fb6a912 | 3089 | error_at (loc, "%qE undeclared here (not in a function)", id); |
3bdb6310 | 3090 | scope = current_scope; |
a0c21e2b | 3091 | } |
3092 | else | |
3093 | { | |
f15f2e56 | 3094 | if (!objc_diagnose_private_ivar (id)) |
3095 | error_at (loc, "%qE undeclared (first use in this function)", id); | |
84166705 | 3096 | if (!already) |
a0c21e2b | 3097 | { |
83d93c3b | 3098 | inform (loc, "each undeclared identifier is reported only" |
3099 | " once for each function it appears in"); | |
a0c21e2b | 3100 | already = true; |
3101 | } | |
3102 | ||
393b349a | 3103 | /* If we are parsing old-style parameter decls, current_function_decl |
a0c938f0 | 3104 | will be nonnull but current_function_scope will be null. */ |
393b349a | 3105 | scope = current_function_scope ? current_function_scope : current_scope; |
a0c21e2b | 3106 | } |
6fb80942 | 3107 | bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false, |
3108 | UNKNOWN_LOCATION); | |
a0c21e2b | 3109 | } |
51ef3909 | 3110 | \f |
bdc33d98 | 3111 | /* Subroutine of lookup_label, declare_label, define_label: construct a |
f805d53d | 3112 | LABEL_DECL with all the proper frills. Also create a struct |
3113 | c_label_vars initialized for the current scope. */ | |
bdc33d98 | 3114 | |
3115 | static tree | |
f805d53d | 3116 | make_label (location_t location, tree name, bool defining, |
3117 | struct c_label_vars **p_label_vars) | |
bdc33d98 | 3118 | { |
e60a6f7b | 3119 | tree label = build_decl (location, LABEL_DECL, name, void_type_node); |
bdc33d98 | 3120 | DECL_CONTEXT (label) = current_function_decl; |
3121 | DECL_MODE (label) = VOIDmode; | |
bdc33d98 | 3122 | |
25a27413 | 3123 | c_label_vars *label_vars = ggc_alloc<c_label_vars> (); |
f805d53d | 3124 | label_vars->shadowed = NULL; |
3125 | set_spot_bindings (&label_vars->label_bindings, defining); | |
3126 | label_vars->decls_in_scope = make_tree_vector (); | |
f1f41a6c | 3127 | label_vars->gotos = NULL; |
f805d53d | 3128 | *p_label_vars = label_vars; |
3129 | ||
bdc33d98 | 3130 | return label; |
3131 | } | |
3132 | ||
bdc33d98 | 3133 | /* Get the LABEL_DECL corresponding to identifier NAME as a label. |
51ef3909 | 3134 | Create one if none exists so far for the current function. |
bdc33d98 | 3135 | This is called when a label is used in a goto expression or |
3136 | has its address taken. */ | |
51ef3909 | 3137 | |
3138 | tree | |
bdc33d98 | 3139 | lookup_label (tree name) |
51ef3909 | 3140 | { |
bdc33d98 | 3141 | tree label; |
f805d53d | 3142 | struct c_label_vars *label_vars; |
51ef3909 | 3143 | |
0a4efe82 | 3144 | if (current_function_scope == 0) |
dc5e019a | 3145 | { |
782858b8 | 3146 | error ("label %qE referenced outside of any function", name); |
dc5e019a | 3147 | return 0; |
3148 | } | |
3149 | ||
bdc33d98 | 3150 | /* Use a label already defined or ref'd with this name, but not if |
3151 | it is inherited from a containing function and wasn't declared | |
3152 | using __label__. */ | |
393b349a | 3153 | label = I_LABEL_DECL (name); |
bdc33d98 | 3154 | if (label && (DECL_CONTEXT (label) == current_function_decl |
3155 | || C_DECLARED_LABEL_FLAG (label))) | |
51ef3909 | 3156 | { |
bdc33d98 | 3157 | /* If the label has only been declared, update its apparent |
3158 | location to point here, for better diagnostics if it | |
3159 | turns out not to have been defined. */ | |
f805d53d | 3160 | if (DECL_INITIAL (label) == NULL_TREE) |
346064d9 | 3161 | DECL_SOURCE_LOCATION (label) = input_location; |
bdc33d98 | 3162 | return label; |
51ef3909 | 3163 | } |
3164 | ||
bdc33d98 | 3165 | /* No label binding for that identifier; make one. */ |
f805d53d | 3166 | label = make_label (input_location, name, false, &label_vars); |
51ef3909 | 3167 | |
b3924a2c | 3168 | /* Ordinary labels go in the current function scope. */ |
f805d53d | 3169 | bind_label (name, label, current_function_scope, label_vars); |
3170 | ||
3171 | return label; | |
3172 | } | |
3173 | ||
3174 | /* Issue a warning about DECL for a goto statement at GOTO_LOC going | |
3175 | to LABEL. */ | |
3176 | ||
3177 | static void | |
3178 | warn_about_goto (location_t goto_loc, tree label, tree decl) | |
3179 | { | |
3180 | if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) | |
3181 | error_at (goto_loc, | |
3182 | "jump into scope of identifier with variably modified type"); | |
3183 | else | |
3184 | warning_at (goto_loc, OPT_Wjump_misses_init, | |
3185 | "jump skips variable initialization"); | |
3186 | inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label); | |
3187 | inform (DECL_SOURCE_LOCATION (decl), "%qD declared here", decl); | |
3188 | } | |
3189 | ||
3190 | /* Look up a label because of a goto statement. This is like | |
3191 | lookup_label, but also issues any appropriate warnings. */ | |
3192 | ||
3193 | tree | |
3194 | lookup_label_for_goto (location_t loc, tree name) | |
3195 | { | |
3196 | tree label; | |
3197 | struct c_label_vars *label_vars; | |
3198 | unsigned int ix; | |
3199 | tree decl; | |
3200 | ||
3201 | label = lookup_label (name); | |
3202 | if (label == NULL_TREE) | |
3203 | return NULL_TREE; | |
3204 | ||
3205 | /* If we are jumping to a different function, we can't issue any | |
3206 | useful warnings. */ | |
3207 | if (DECL_CONTEXT (label) != current_function_decl) | |
3208 | { | |
3209 | gcc_assert (C_DECLARED_LABEL_FLAG (label)); | |
3210 | return label; | |
3211 | } | |
3212 | ||
3213 | label_vars = I_LABEL_BINDING (name)->u.label; | |
3214 | ||
3215 | /* If the label has not yet been defined, then push this goto on a | |
3216 | list for possible later warnings. */ | |
3217 | if (label_vars->label_bindings.scope == NULL) | |
3218 | { | |
25a27413 | 3219 | c_goto_bindings *g = ggc_alloc<c_goto_bindings> (); |
f805d53d | 3220 | |
f805d53d | 3221 | g->loc = loc; |
3222 | set_spot_bindings (&g->goto_bindings, true); | |
f1f41a6c | 3223 | vec_safe_push (label_vars->gotos, g); |
f805d53d | 3224 | return label; |
3225 | } | |
3226 | ||
3227 | /* If there are any decls in label_vars->decls_in_scope, then this | |
3228 | goto has missed the declaration of the decl. This happens for a | |
3229 | case like | |
3230 | int i = 1; | |
3231 | lab: | |
3232 | ... | |
3233 | goto lab; | |
3234 | Issue a warning or error. */ | |
f1f41a6c | 3235 | FOR_EACH_VEC_SAFE_ELT (label_vars->decls_in_scope, ix, decl) |
f805d53d | 3236 | warn_about_goto (loc, label, decl); |
3237 | ||
3238 | if (label_vars->label_bindings.left_stmt_expr) | |
3239 | { | |
3240 | error_at (loc, "jump into statement expression"); | |
3241 | inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label); | |
3242 | } | |
3243 | ||
bdc33d98 | 3244 | return label; |
51ef3909 | 3245 | } |
3246 | ||
bdc33d98 | 3247 | /* Make a label named NAME in the current function, shadowing silently |
3248 | any that may be inherited from containing functions or containing | |
3249 | scopes. This is called for __label__ declarations. */ | |
51ef3909 | 3250 | |
51ef3909 | 3251 | tree |
bdc33d98 | 3252 | declare_label (tree name) |
51ef3909 | 3253 | { |
393b349a | 3254 | struct c_binding *b = I_LABEL_BINDING (name); |
3255 | tree label; | |
f805d53d | 3256 | struct c_label_vars *label_vars; |
51ef3909 | 3257 | |
bdc33d98 | 3258 | /* Check to make sure that the label hasn't already been declared |
3259 | at this scope */ | |
4194491a | 3260 | if (b && B_IN_CURRENT_SCOPE (b)) |
393b349a | 3261 | { |
782858b8 | 3262 | error ("duplicate label declaration %qE", name); |
a52d5726 | 3263 | locate_old_decl (b->decl); |
407dc108 | 3264 | |
393b349a | 3265 | /* Just use the previous declaration. */ |
3266 | return b->decl; | |
3267 | } | |
407dc108 | 3268 | |
f805d53d | 3269 | label = make_label (input_location, name, false, &label_vars); |
bdc33d98 | 3270 | C_DECLARED_LABEL_FLAG (label) = 1; |
51ef3909 | 3271 | |
bdc33d98 | 3272 | /* Declared labels go in the current scope. */ |
f805d53d | 3273 | bind_label (name, label, current_scope, label_vars); |
3274 | ||
bdc33d98 | 3275 | return label; |
51ef3909 | 3276 | } |
3277 | ||
f805d53d | 3278 | /* When we define a label, issue any appropriate warnings if there are |
3279 | any gotos earlier in the function which jump to this label. */ | |
3280 | ||
3281 | static void | |
3282 | check_earlier_gotos (tree label, struct c_label_vars* label_vars) | |
3283 | { | |
3284 | unsigned int ix; | |
3285 | struct c_goto_bindings *g; | |
3286 | ||
f1f41a6c | 3287 | FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g) |
f805d53d | 3288 | { |
3289 | struct c_binding *b; | |
3290 | struct c_scope *scope; | |
3291 | ||
3292 | /* We have a goto to this label. The goto is going forward. In | |
3293 | g->scope, the goto is going to skip any binding which was | |
3294 | defined after g->bindings_in_scope. */ | |
f583ffd4 | 3295 | if (g->goto_bindings.scope->has_jump_unsafe_decl) |
f805d53d | 3296 | { |
f583ffd4 | 3297 | for (b = g->goto_bindings.scope->bindings; |
3298 | b != g->goto_bindings.bindings_in_scope; | |
3299 | b = b->prev) | |
3300 | { | |
3301 | if (decl_jump_unsafe (b->decl)) | |
3302 | warn_about_goto (g->loc, label, b->decl); | |
3303 | } | |
f805d53d | 3304 | } |
3305 | ||
3306 | /* We also need to warn about decls defined in any scopes | |
3307 | between the scope of the label and the scope of the goto. */ | |
3308 | for (scope = label_vars->label_bindings.scope; | |
3309 | scope != g->goto_bindings.scope; | |
3310 | scope = scope->outer) | |
3311 | { | |
3312 | gcc_assert (scope != NULL); | |
f583ffd4 | 3313 | if (scope->has_jump_unsafe_decl) |
f805d53d | 3314 | { |
f583ffd4 | 3315 | if (scope == label_vars->label_bindings.scope) |
3316 | b = label_vars->label_bindings.bindings_in_scope; | |
3317 | else | |
3318 | b = scope->bindings; | |
3319 | for (; b != NULL; b = b->prev) | |
3320 | { | |
3321 | if (decl_jump_unsafe (b->decl)) | |
3322 | warn_about_goto (g->loc, label, b->decl); | |
3323 | } | |
f805d53d | 3324 | } |
3325 | } | |
3326 | ||
3327 | if (g->goto_bindings.stmt_exprs > 0) | |
3328 | { | |
3329 | error_at (g->loc, "jump into statement expression"); | |
3330 | inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", | |
3331 | label); | |
3332 | } | |
3333 | } | |
3334 | ||
3335 | /* Now that the label is defined, we will issue warnings about | |
3336 | subsequent gotos to this label when we see them. */ | |
f1f41a6c | 3337 | vec_safe_truncate (label_vars->gotos, 0); |
f805d53d | 3338 | label_vars->gotos = NULL; |
3339 | } | |
3340 | ||
51ef3909 | 3341 | /* Define a label, specifying the location in the source file. |
3342 | Return the LABEL_DECL node for the label, if the definition is valid. | |
3343 | Otherwise return 0. */ | |
3344 | ||
3345 | tree | |
92ddaf90 | 3346 | define_label (location_t location, tree name) |
51ef3909 | 3347 | { |
bdc33d98 | 3348 | /* Find any preexisting label with this name. It is an error |
3349 | if that label has already been defined in this function, or | |
3350 | if there is a containing function with a declared label with | |
3351 | the same name. */ | |
393b349a | 3352 | tree label = I_LABEL_DECL (name); |
bdc33d98 | 3353 | |
3354 | if (label | |
3355 | && ((DECL_CONTEXT (label) == current_function_decl | |
3356 | && DECL_INITIAL (label) != 0) | |
3357 | || (DECL_CONTEXT (label) != current_function_decl | |
3358 | && C_DECLARED_LABEL_FLAG (label)))) | |
51ef3909 | 3359 | { |
e60a6f7b | 3360 | error_at (location, "duplicate label %qD", label); |
a52d5726 | 3361 | locate_old_decl (label); |
bdc33d98 | 3362 | return 0; |
51ef3909 | 3363 | } |
bdc33d98 | 3364 | else if (label && DECL_CONTEXT (label) == current_function_decl) |
51ef3909 | 3365 | { |
f805d53d | 3366 | struct c_label_vars *label_vars = I_LABEL_BINDING (name)->u.label; |
3367 | ||
bdc33d98 | 3368 | /* The label has been used or declared already in this function, |
3369 | but not defined. Update its location to point to this | |
3370 | definition. */ | |
346064d9 | 3371 | DECL_SOURCE_LOCATION (label) = location; |
f805d53d | 3372 | set_spot_bindings (&label_vars->label_bindings, true); |
3373 | ||
3374 | /* Issue warnings as required about any goto statements from | |
3375 | earlier in the function. */ | |
3376 | check_earlier_gotos (label, label_vars); | |
51ef3909 | 3377 | } |
3378 | else | |
3379 | { | |
f805d53d | 3380 | struct c_label_vars *label_vars; |
3381 | ||
bdc33d98 | 3382 | /* No label binding for that identifier; make one. */ |
f805d53d | 3383 | label = make_label (location, name, true, &label_vars); |
bdc33d98 | 3384 | |
b3924a2c | 3385 | /* Ordinary labels go in the current function scope. */ |
f805d53d | 3386 | bind_label (name, label, current_function_scope, label_vars); |
51ef3909 | 3387 | } |
bdc33d98 | 3388 | |
3df42822 | 3389 | if (!in_system_header_at (input_location) && lookup_name (name)) |
e60a6f7b | 3390 | warning_at (location, OPT_Wtraditional, |
3391 | "traditional C lacks a separate namespace " | |
3392 | "for labels, identifier %qE conflicts", name); | |
bdc33d98 | 3393 | |
3394 | /* Mark label as having been defined. */ | |
3395 | DECL_INITIAL (label) = error_mark_node; | |
3396 | return label; | |
51ef3909 | 3397 | } |
51ef3909 | 3398 | \f |
f805d53d | 3399 | /* Get the bindings for a new switch statement. This is used to issue |
3400 | warnings as appropriate for jumps from the switch to case or | |
3401 | default labels. */ | |
3402 | ||
3403 | struct c_spot_bindings * | |
3404 | c_get_switch_bindings (void) | |
3405 | { | |
3406 | struct c_spot_bindings *switch_bindings; | |
3407 | ||
3408 | switch_bindings = XNEW (struct c_spot_bindings); | |
3409 | set_spot_bindings (switch_bindings, true); | |
3410 | return switch_bindings; | |
3411 | } | |
3412 | ||
3413 | void | |
3414 | c_release_switch_bindings (struct c_spot_bindings *bindings) | |
3415 | { | |
3416 | gcc_assert (bindings->stmt_exprs == 0 && !bindings->left_stmt_expr); | |
3417 | XDELETE (bindings); | |
3418 | } | |
3419 | ||
3420 | /* This is called at the point of a case or default label to issue | |
3421 | warnings about decls as needed. It returns true if it found an | |
3422 | error, not just a warning. */ | |
3423 | ||
3424 | bool | |
3425 | c_check_switch_jump_warnings (struct c_spot_bindings *switch_bindings, | |
3426 | location_t switch_loc, location_t case_loc) | |
3427 | { | |
3428 | bool saw_error; | |
3429 | struct c_scope *scope; | |
3430 | ||
3431 | saw_error = false; | |
3432 | for (scope = current_scope; | |
3433 | scope != switch_bindings->scope; | |
3434 | scope = scope->outer) | |
3435 | { | |
3436 | struct c_binding *b; | |
3437 | ||
3438 | gcc_assert (scope != NULL); | |
f583ffd4 | 3439 | |
3440 | if (!scope->has_jump_unsafe_decl) | |
3441 | continue; | |
3442 | ||
f805d53d | 3443 | for (b = scope->bindings; b != NULL; b = b->prev) |
3444 | { | |
3445 | if (decl_jump_unsafe (b->decl)) | |
3446 | { | |
3447 | if (variably_modified_type_p (TREE_TYPE (b->decl), NULL_TREE)) | |
3448 | { | |
3449 | saw_error = true; | |
3450 | error_at (case_loc, | |
3451 | ("switch jumps into scope of identifier with " | |
3452 | "variably modified type")); | |
3453 | } | |
3454 | else | |
3455 | warning_at (case_loc, OPT_Wjump_misses_init, | |
3456 | "switch jumps over variable initialization"); | |
3457 | inform (switch_loc, "switch starts here"); | |
3458 | inform (DECL_SOURCE_LOCATION (b->decl), "%qD declared here", | |
3459 | b->decl); | |
3460 | } | |
3461 | } | |
3462 | } | |
3463 | ||
3464 | if (switch_bindings->stmt_exprs > 0) | |
3465 | { | |
3466 | saw_error = true; | |
3467 | error_at (case_loc, "switch jumps into statement expression"); | |
3468 | inform (switch_loc, "switch starts here"); | |
3469 | } | |
3470 | ||
3471 | return saw_error; | |
3472 | } | |
3473 | \f | |
51ef3909 | 3474 | /* Given NAME, an IDENTIFIER_NODE, |
3475 | return the structure (or union or enum) definition for that name. | |
6e899616 | 3476 | If THISLEVEL_ONLY is nonzero, searches only the current_scope. |
51ef3909 | 3477 | CODE says which kind of type the caller wants; |
3478 | it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE. | |
0b09525f | 3479 | If PLOC is not NULL and this returns non-null, it sets *PLOC to the |
3480 | location where the tag was defined. | |
51ef3909 | 3481 | If the wrong kind of type is found, an error is reported. */ |
3482 | ||
3483 | static tree | |
0b09525f | 3484 | lookup_tag (enum tree_code code, tree name, int thislevel_only, |
3485 | location_t *ploc) | |
51ef3909 | 3486 | { |
393b349a | 3487 | struct c_binding *b = I_TAG_BINDING (name); |
31ddae9f | 3488 | int thislevel = 0; |
51ef3909 | 3489 | |
393b349a | 3490 | if (!b || !b->decl) |
31ddae9f | 3491 | return 0; |
3492 | ||
3493 | /* We only care about whether it's in this level if | |
3494 | thislevel_only was set or it might be a type clash. */ | |
393b349a | 3495 | if (thislevel_only || TREE_CODE (b->decl) != code) |
3496 | { | |
3497 | /* For our purposes, a tag in the external scope is the same as | |
3498 | a tag in the file scope. (Primarily relevant to Objective-C | |
3499 | and its builtin structure tags, which get pushed before the | |
14338e9a | 3500 | file scope is created.) */ |
4194491a | 3501 | if (B_IN_CURRENT_SCOPE (b) |
3502 | || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b))) | |
31ddae9f | 3503 | thislevel = 1; |
51ef3909 | 3504 | } |
31ddae9f | 3505 | |
3506 | if (thislevel_only && !thislevel) | |
3507 | return 0; | |
3508 | ||
393b349a | 3509 | if (TREE_CODE (b->decl) != code) |
31ddae9f | 3510 | { |
3511 | /* Definition isn't the kind we were looking for. */ | |
3512 | pending_invalid_xref = name; | |
bca5a169 | 3513 | pending_invalid_xref_location = input_location; |
31ddae9f | 3514 | |
3515 | /* If in the same binding level as a declaration as a tag | |
3516 | of a different type, this must not be allowed to | |
3517 | shadow that tag, so give the error immediately. | |
3518 | (For example, "struct foo; union foo;" is invalid.) */ | |
3519 | if (thislevel) | |
3520 | pending_xref_error (); | |
3521 | } | |
0b09525f | 3522 | |
3523 | if (ploc != NULL) | |
3524 | *ploc = b->locus; | |
3525 | ||
393b349a | 3526 | return b->decl; |
51ef3909 | 3527 | } |
3528 | ||
3529 | /* Print an error message now | |
3530 | for a recent invalid struct, union or enum cross reference. | |
3531 | We don't print them immediately because they are not invalid | |
3532 | when used in the `struct foo;' construct for shadowing. */ | |
3533 | ||
3534 | void | |
1cae46be | 3535 | pending_xref_error (void) |
51ef3909 | 3536 | { |
3537 | if (pending_invalid_xref != 0) | |
5fb6a912 | 3538 | error_at (pending_invalid_xref_location, "%qE defined as wrong kind of tag", |
3539 | pending_invalid_xref); | |
51ef3909 | 3540 | pending_invalid_xref = 0; |
3541 | } | |
3542 | ||
51ef3909 | 3543 | \f |
6e899616 | 3544 | /* Look up NAME in the current scope and its superiors |
51ef3909 | 3545 | in the namespace of variables, functions and typedefs. |
3546 | Return a ..._DECL node of some kind representing its definition, | |
3547 | or return 0 if it is undefined. */ | |
3548 | ||
3549 | tree | |
1cae46be | 3550 | lookup_name (tree name) |
51ef3909 | 3551 | { |
393b349a | 3552 | struct c_binding *b = I_SYMBOL_BINDING (name); |
4194491a | 3553 | if (b && !b->invisible) |
a4e3ffad | 3554 | { |
3555 | maybe_record_typedef_use (b->decl); | |
3556 | return b->decl; | |
3557 | } | |
393b349a | 3558 | return 0; |
51ef3909 | 3559 | } |
3560 | ||
393b349a | 3561 | /* Similar to `lookup_name' but look only at the indicated scope. */ |
51ef3909 | 3562 | |
31ddae9f | 3563 | static tree |
393b349a | 3564 | lookup_name_in_scope (tree name, struct c_scope *scope) |
51ef3909 | 3565 | { |
393b349a | 3566 | struct c_binding *b; |
31ddae9f | 3567 | |
393b349a | 3568 | for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed) |
4194491a | 3569 | if (B_IN_SCOPE (b, scope)) |
393b349a | 3570 | return b->decl; |
31ddae9f | 3571 | return 0; |
51ef3909 | 3572 | } |
3573 | \f | |
3574 | /* Create the predefined scalar types of C, | |
a92771b8 | 3575 | and some nodes representing standard constants (0, 1, (void *) 0). |
6e899616 | 3576 | Initialize the global scope. |
51ef3909 | 3577 | Make definitions for built-in primitive functions. */ |
3578 | ||
3579 | void | |
1cae46be | 3580 | c_init_decl_processing (void) |
51ef3909 | 3581 | { |
fb050357 | 3582 | location_t save_loc = input_location; |
d9cf68bf | 3583 | |
1576dec7 | 3584 | /* Initialize reserved words for parser. */ |
9ceb1c29 | 3585 | c_parse_init (); |
3586 | ||
b3924a2c | 3587 | current_function_decl = 0; |
4214af46 | 3588 | |
9823d3a9 | 3589 | gcc_obstack_init (&parser_obstack); |
3590 | ||
393b349a | 3591 | /* Make the externals scope. */ |
3592 | push_scope (); | |
3593 | external_scope = current_scope; | |
b3924a2c | 3594 | |
6d042e21 | 3595 | /* Declarations from c_common_nodes_and_builtins must not be associated |
3596 | with this input file, lest we get differences between using and not | |
3597 | using preprocessed headers. */ | |
9a6486a6 | 3598 | input_location = BUILTINS_LOCATION; |
51ef3909 | 3599 | |
174fcc61 | 3600 | c_common_nodes_and_builtins (); |
51ef3909 | 3601 | |
3c2239cf | 3602 | /* In C, comparisons and TRUTH_* expressions have type int. */ |
3603 | truthvalue_type_node = integer_type_node; | |
3604 | truthvalue_true_node = integer_one_node; | |
3605 | truthvalue_false_node = integer_zero_node; | |
3606 | ||
3607 | /* Even in C99, which has a real boolean type. */ | |
e60a6f7b | 3608 | pushdecl (build_decl (UNKNOWN_LOCATION, TYPE_DECL, get_identifier ("_Bool"), |
3c2239cf | 3609 | boolean_type_node)); |
4f9a1c9b | 3610 | |
fb050357 | 3611 | input_location = save_loc; |
6d042e21 | 3612 | |
a7ea5e81 | 3613 | pedantic_lvalues = true; |
42dc8caf | 3614 | |
9e5a737d | 3615 | make_fname_decl = c_make_fname_decl; |
65b7f83f | 3616 | start_fname_decls (); |
51ef3909 | 3617 | } |
3618 | ||
e60a6f7b | 3619 | /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to |
3620 | give the decl, NAME is the initialization string and TYPE_DEP | |
3621 | indicates whether NAME depended on the type of the function. As we | |
3622 | don't yet implement delayed emission of static data, we mark the | |
3623 | decl as emitted so it is not placed in the output. Anything using | |
3624 | it must therefore pull out the STRING_CST initializer directly. | |
3625 | FIXME. */ | |
9e5a737d | 3626 | |
3627 | static tree | |
e60a6f7b | 3628 | c_make_fname_decl (location_t loc, tree id, int type_dep) |
9e5a737d | 3629 | { |
65b7f83f | 3630 | const char *name = fname_as_string (type_dep); |
9e5a737d | 3631 | tree decl, type, init; |
3632 | size_t length = strlen (name); | |
3633 | ||
aebc8537 | 3634 | type = build_array_type (char_type_node, |
3635 | build_index_type (size_int (length))); | |
3636 | type = c_build_qualified_type (type, TYPE_QUAL_CONST); | |
9e5a737d | 3637 | |
e60a6f7b | 3638 | decl = build_decl (loc, VAR_DECL, id, type); |
1cae46be | 3639 | |
9e5a737d | 3640 | TREE_STATIC (decl) = 1; |
3641 | TREE_READONLY (decl) = 1; | |
9e5a737d | 3642 | DECL_ARTIFICIAL (decl) = 1; |
1cae46be | 3643 | |
9e5a737d | 3644 | init = build_string (length + 1, name); |
e47a6f81 | 3645 | free (CONST_CAST (char *, name)); |
9e5a737d | 3646 | TREE_TYPE (init) = type; |
3647 | DECL_INITIAL (decl) = init; | |
65b7f83f | 3648 | |
3649 | TREE_USED (decl) = 1; | |
81010c97 | 3650 | |
c902ba74 | 3651 | if (current_function_decl |
3652 | /* For invalid programs like this: | |
48e1416a | 3653 | |
c902ba74 | 3654 | void foo() |
3655 | const char* p = __FUNCTION__; | |
48e1416a | 3656 | |
c902ba74 | 3657 | the __FUNCTION__ is believed to appear in K&R style function |
3658 | parameter declarator. In that case we still don't have | |
3659 | function_scope. */ | |
852f689e | 3660 | && (!seen_error () || current_function_scope)) |
3bdb6310 | 3661 | { |
3662 | DECL_CONTEXT (decl) = current_function_decl; | |
4194491a | 3663 | bind (id, decl, current_function_scope, |
6fb80942 | 3664 | /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION); |
3bdb6310 | 3665 | } |
31ddae9f | 3666 | |
e60a6f7b | 3667 | finish_decl (decl, loc, init, NULL_TREE, NULL_TREE); |
4214af46 | 3668 | |
9e5a737d | 3669 | return decl; |
3670 | } | |
3671 | ||
08f8d953 | 3672 | tree |
54be5d7e | 3673 | c_builtin_function (tree decl) |
51ef3909 | 3674 | { |
54be5d7e | 3675 | tree type = TREE_TYPE (decl); |
3676 | tree id = DECL_NAME (decl); | |
3677 | ||
3678 | const char *name = IDENTIFIER_POINTER (id); | |
a36cf284 | 3679 | C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type); |
8305149e | 3680 | |
393b349a | 3681 | /* Should never be called on a symbol with a preexisting meaning. */ |
231bd014 | 3682 | gcc_assert (!I_SYMBOL_BINDING (id)); |
393b349a | 3683 | |
6fb80942 | 3684 | bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false, |
3685 | UNKNOWN_LOCATION); | |
393b349a | 3686 | |
24470055 | 3687 | /* Builtins in the implementation namespace are made visible without |
3688 | needing to be explicitly declared. See push_file_scope. */ | |
3689 | if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1]))) | |
3690 | { | |
1767a056 | 3691 | DECL_CHAIN (decl) = visible_builtins; |
24470055 | 3692 | visible_builtins = decl; |
3693 | } | |
3694 | ||
3695 | return decl; | |
3696 | } | |
3697 | ||
3698 | tree | |
3699 | c_builtin_function_ext_scope (tree decl) | |
3700 | { | |
3701 | tree type = TREE_TYPE (decl); | |
3702 | tree id = DECL_NAME (decl); | |
3703 | ||
3704 | const char *name = IDENTIFIER_POINTER (id); | |
a36cf284 | 3705 | C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type); |
24470055 | 3706 | |
d09768a4 | 3707 | if (external_scope) |
3708 | bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false, | |
3709 | UNKNOWN_LOCATION); | |
24470055 | 3710 | |
393b349a | 3711 | /* Builtins in the implementation namespace are made visible without |
3712 | needing to be explicitly declared. See push_file_scope. */ | |
3713 | if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1]))) | |
3714 | { | |
1767a056 | 3715 | DECL_CHAIN (decl) = visible_builtins; |
393b349a | 3716 | visible_builtins = decl; |
3717 | } | |
51ef3909 | 3718 | |
3719 | return decl; | |
3720 | } | |
3721 | \f | |
3722 | /* Called when a declaration is seen that contains no names to declare. | |
3723 | If its type is a reference to a structure, union or enum inherited | |
3724 | from a containing scope, shadow that tag name for the current scope | |
3725 | with a forward reference. | |
3726 | If its type defines a new named structure or union | |
3727 | or defines an enum, it is valid but we need not do anything here. | |
3728 | Otherwise, it is an error. */ | |
3729 | ||
3730 | void | |
9553111d | 3731 | shadow_tag (const struct c_declspecs *declspecs) |
0d137cd9 | 3732 | { |
3733 | shadow_tag_warned (declspecs, 0); | |
3734 | } | |
3735 | ||
b2c4af5e | 3736 | /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning, |
3737 | but no pedwarn. */ | |
0d137cd9 | 3738 | void |
9553111d | 3739 | shadow_tag_warned (const struct c_declspecs *declspecs, int warned) |
51ef3909 | 3740 | { |
9553111d | 3741 | bool found_tag = false; |
51ef3909 | 3742 | |
70dd11f7 | 3743 | if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p) |
51ef3909 | 3744 | { |
9553111d | 3745 | tree value = declspecs->type; |
19cb6b50 | 3746 | enum tree_code code = TREE_CODE (value); |
51ef3909 | 3747 | |
3748 | if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE) | |
3749 | /* Used to test also that TYPE_SIZE (value) != 0. | |
3750 | That caused warning for `struct foo;' at top level in the file. */ | |
3751 | { | |
31ddae9f | 3752 | tree name = TYPE_NAME (value); |
19cb6b50 | 3753 | tree t; |
51ef3909 | 3754 | |
9553111d | 3755 | found_tag = true; |
51ef3909 | 3756 | |
577f4774 | 3757 | if (declspecs->restrict_p) |
3758 | { | |
3759 | error ("invalid use of %<restrict%>"); | |
3760 | warned = 1; | |
3761 | } | |
3762 | ||
51ef3909 | 3763 | if (name == 0) |
3764 | { | |
677cfa00 | 3765 | if (warned != 1 && code != ENUMERAL_TYPE) |
3766 | /* Empty unnamed enum OK */ | |
51ef3909 | 3767 | { |
21ca8540 | 3768 | pedwarn (input_location, 0, |
3769 | "unnamed struct/union that defines no instances"); | |
51ef3909 | 3770 | warned = 1; |
3771 | } | |
3772 | } | |
ae5ead32 | 3773 | else if (declspecs->typespec_kind != ctsk_tagdef |
3774 | && declspecs->typespec_kind != ctsk_tagfirstref | |
19702c1d | 3775 | && declspecs->storage_class != csc_none) |
3776 | { | |
3777 | if (warned != 1) | |
21ca8540 | 3778 | pedwarn (input_location, 0, |
3779 | "empty declaration with storage class specifier " | |
3780 | "does not redeclare tag"); | |
19702c1d | 3781 | warned = 1; |
3782 | pending_xref_error (); | |
3783 | } | |
ae5ead32 | 3784 | else if (declspecs->typespec_kind != ctsk_tagdef |
3785 | && declspecs->typespec_kind != ctsk_tagfirstref | |
19702c1d | 3786 | && (declspecs->const_p |
3787 | || declspecs->volatile_p | |
b560fabd | 3788 | || declspecs->atomic_p |
6d5d708e | 3789 | || declspecs->restrict_p |
3790 | || declspecs->address_space)) | |
19702c1d | 3791 | { |
3792 | if (warned != 1) | |
21ca8540 | 3793 | pedwarn (input_location, 0, |
3794 | "empty declaration with type qualifier " | |
8864917d | 3795 | "does not redeclare tag"); |
19702c1d | 3796 | warned = 1; |
3797 | pending_xref_error (); | |
3798 | } | |
83e25171 | 3799 | else if (declspecs->typespec_kind != ctsk_tagdef |
3800 | && declspecs->typespec_kind != ctsk_tagfirstref | |
3801 | && declspecs->alignas_p) | |
3802 | { | |
3803 | if (warned != 1) | |
3804 | pedwarn (input_location, 0, | |
3805 | "empty declaration with %<_Alignas%> " | |
3806 | "does not redeclare tag"); | |
3807 | warned = 1; | |
3808 | pending_xref_error (); | |
3809 | } | |
51ef3909 | 3810 | else |
3811 | { | |
19702c1d | 3812 | pending_invalid_xref = 0; |
0b09525f | 3813 | t = lookup_tag (code, name, 1, NULL); |
51ef3909 | 3814 | |
3815 | if (t == 0) | |
3816 | { | |
3817 | t = make_node (code); | |
e60a6f7b | 3818 | pushtag (input_location, name, t); |
51ef3909 | 3819 | } |
3820 | } | |
3821 | } | |
3822 | else | |
3823 | { | |
3df42822 | 3824 | if (warned != 1 && !in_system_header_at (input_location)) |
677cfa00 | 3825 | { |
21ca8540 | 3826 | pedwarn (input_location, 0, |
3827 | "useless type name in empty declaration"); | |
9553111d | 3828 | warned = 1; |
677cfa00 | 3829 | } |
51ef3909 | 3830 | } |
3831 | } | |
3df42822 | 3832 | else if (warned != 1 && !in_system_header_at (input_location) |
3833 | && declspecs->typedef_p) | |
9553111d | 3834 | { |
21ca8540 | 3835 | pedwarn (input_location, 0, "useless type name in empty declaration"); |
9553111d | 3836 | warned = 1; |
3837 | } | |
3838 | ||
19702c1d | 3839 | pending_invalid_xref = 0; |
3840 | ||
feb04535 | 3841 | if (declspecs->inline_p) |
3842 | { | |
3843 | error ("%<inline%> in empty declaration"); | |
3844 | warned = 1; | |
3845 | } | |
3846 | ||
985c6e3a | 3847 | if (declspecs->noreturn_p) |
3848 | { | |
3849 | error ("%<_Noreturn%> in empty declaration"); | |
3850 | warned = 1; | |
3851 | } | |
3852 | ||
feb04535 | 3853 | if (current_scope == file_scope && declspecs->storage_class == csc_auto) |
3854 | { | |
3855 | error ("%<auto%> in file-scope empty declaration"); | |
3856 | warned = 1; | |
3857 | } | |
3858 | ||
3859 | if (current_scope == file_scope && declspecs->storage_class == csc_register) | |
3860 | { | |
3861 | error ("%<register%> in file-scope empty declaration"); | |
3862 | warned = 1; | |
3863 | } | |
3864 | ||
3df42822 | 3865 | if (!warned && !in_system_header_at (input_location) |
3866 | && declspecs->storage_class != csc_none) | |
feb04535 | 3867 | { |
c3ceba8e | 3868 | warning (0, "useless storage class specifier in empty declaration"); |
feb04535 | 3869 | warned = 2; |
3870 | } | |
3871 | ||
3df42822 | 3872 | if (!warned && !in_system_header_at (input_location) && declspecs->thread_p) |
feb04535 | 3873 | { |
d184e0c0 | 3874 | warning (0, "useless %qs in empty declaration", |
3875 | declspecs->thread_gnu_p ? "__thread" : "_Thread_local"); | |
feb04535 | 3876 | warned = 2; |
3877 | } | |
3878 | ||
3df42822 | 3879 | if (!warned |
3880 | && !in_system_header_at (input_location) | |
3881 | && (declspecs->const_p | |
3882 | || declspecs->volatile_p | |
3883 | || declspecs->atomic_p | |
3884 | || declspecs->restrict_p | |
3885 | || declspecs->address_space)) | |
bb476216 | 3886 | { |
c3ceba8e | 3887 | warning (0, "useless type qualifier in empty declaration"); |
bb476216 | 3888 | warned = 2; |
3889 | } | |
3890 | ||
3df42822 | 3891 | if (!warned && !in_system_header_at (input_location) |
3892 | && declspecs->alignas_p) | |
83e25171 | 3893 | { |
3894 | warning (0, "useless %<_Alignas%> in empty declaration"); | |
3895 | warned = 2; | |
3896 | } | |
3897 | ||
677cfa00 | 3898 | if (warned != 1) |
51ef3909 | 3899 | { |
9553111d | 3900 | if (!found_tag) |
21ca8540 | 3901 | pedwarn (input_location, 0, "empty declaration"); |
51ef3909 | 3902 | } |
3903 | } | |
3904 | \f | |
bb476216 | 3905 | |
3906 | /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_* | |
3907 | bits. SPECS represents declaration specifiers that the grammar | |
3908 | only permits to contain type qualifiers and attributes. */ | |
3909 | ||
3910 | int | |
3911 | quals_from_declspecs (const struct c_declspecs *specs) | |
3912 | { | |
3913 | int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0) | |
3914 | | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0) | |
6d5d708e | 3915 | | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0) |
b560fabd | 3916 | | (specs->atomic_p ? TYPE_QUAL_ATOMIC : 0) |
6d5d708e | 3917 | | (ENCODE_QUAL_ADDR_SPACE (specs->address_space))); |
bb476216 | 3918 | gcc_assert (!specs->type |
3919 | && !specs->decl_attr | |
70dd11f7 | 3920 | && specs->typespec_word == cts_none |
bb476216 | 3921 | && specs->storage_class == csc_none |
3922 | && !specs->typedef_p | |
70dd11f7 | 3923 | && !specs->explicit_signed_p |
bb476216 | 3924 | && !specs->deprecated_p |
70dd11f7 | 3925 | && !specs->long_p |
bb476216 | 3926 | && !specs->long_long_p |
70dd11f7 | 3927 | && !specs->short_p |
3928 | && !specs->signed_p | |
3929 | && !specs->unsigned_p | |
3930 | && !specs->complex_p | |
bb476216 | 3931 | && !specs->inline_p |
985c6e3a | 3932 | && !specs->noreturn_p |
bb476216 | 3933 | && !specs->thread_p); |
3934 | return quals; | |
3935 | } | |
3936 | ||
e60a6f7b | 3937 | /* Construct an array declarator. LOC is the location of the |
3938 | beginning of the array (usually the opening brace). EXPR is the | |
3939 | expression inside [], or NULL_TREE. QUALS are the type qualifiers | |
3940 | inside the [] (to be applied to the pointer to which a parameter | |
3941 | array is converted). STATIC_P is true if "static" is inside the | |
3942 | [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a | |
3943 | VLA of unspecified length which is nevertheless a complete type, | |
3944 | false otherwise. The field for the contained declarator is left to | |
3945 | be filled in by set_array_declarator_inner. */ | |
1fd94215 | 3946 | |
ac206aff | 3947 | struct c_declarator * |
e60a6f7b | 3948 | build_array_declarator (location_t loc, |
3949 | tree expr, struct c_declspecs *quals, bool static_p, | |
4a125bfc | 3950 | bool vla_unspec_p) |
1fd94215 | 3951 | { |
ac206aff | 3952 | struct c_declarator *declarator = XOBNEW (&parser_obstack, |
3953 | struct c_declarator); | |
e60a6f7b | 3954 | declarator->id_loc = loc; |
ac206aff | 3955 | declarator->kind = cdk_array; |
3956 | declarator->declarator = 0; | |
3957 | declarator->u.array.dimen = expr; | |
bb476216 | 3958 | if (quals) |
3959 | { | |
3960 | declarator->u.array.attrs = quals->attrs; | |
3961 | declarator->u.array.quals = quals_from_declspecs (quals); | |
3962 | } | |
3963 | else | |
3964 | { | |
3965 | declarator->u.array.attrs = NULL_TREE; | |
3966 | declarator->u.array.quals = 0; | |
3967 | } | |
ac206aff | 3968 | declarator->u.array.static_p = static_p; |
3969 | declarator->u.array.vla_unspec_p = vla_unspec_p; | |
890c2e2f | 3970 | if (static_p || quals != NULL) |
3971 | pedwarn_c90 (loc, OPT_Wpedantic, | |
21ca8540 | 3972 | "ISO C90 does not support %<static%> or type " |
b0b1af64 | 3973 | "qualifiers in parameter array declarators"); |
890c2e2f | 3974 | if (vla_unspec_p) |
3975 | pedwarn_c90 (loc, OPT_Wpedantic, | |
21ca8540 | 3976 | "ISO C90 does not support %<[*]%> array declarators"); |
1fd94215 | 3977 | if (vla_unspec_p) |
32d33ab2 | 3978 | { |
3979 | if (!current_scope->parm_flag) | |
3980 | { | |
3981 | /* C99 6.7.5.2p4 */ | |
e60a6f7b | 3982 | error_at (loc, "%<[*]%> not allowed in other than " |
3983 | "function prototype scope"); | |
32d33ab2 | 3984 | declarator->u.array.vla_unspec_p = false; |
3985 | return NULL; | |
3986 | } | |
3987 | current_scope->had_vla_unspec = true; | |
3988 | } | |
ac206aff | 3989 | return declarator; |
1fd94215 | 3990 | } |
3991 | ||
ac206aff | 3992 | /* Set the contained declarator of an array declarator. DECL is the |
3993 | declarator, as constructed by build_array_declarator; INNER is what | |
e6c172ed | 3994 | appears on the left of the []. */ |
1fd94215 | 3995 | |
ac206aff | 3996 | struct c_declarator * |
3997 | set_array_declarator_inner (struct c_declarator *decl, | |
e6c172ed | 3998 | struct c_declarator *inner) |
1fd94215 | 3999 | { |
ac206aff | 4000 | decl->declarator = inner; |
1fd94215 | 4001 | return decl; |
4002 | } | |
4287354c | 4003 | |
4004 | /* INIT is a constructor that forms DECL's initializer. If the final | |
4005 | element initializes a flexible array field, add the size of that | |
4006 | initializer to DECL's size. */ | |
4007 | ||
4008 | static void | |
4009 | add_flexible_array_elts_to_size (tree decl, tree init) | |
4010 | { | |
4287354c | 4011 | tree elt, type; |
4012 | ||
f1f41a6c | 4013 | if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init))) |
4287354c | 4014 | return; |
4015 | ||
f1f41a6c | 4016 | elt = CONSTRUCTOR_ELTS (init)->last ().value; |
4287354c | 4017 | type = TREE_TYPE (elt); |
4018 | if (TREE_CODE (type) == ARRAY_TYPE | |
4019 | && TYPE_SIZE (type) == NULL_TREE | |
4020 | && TYPE_DOMAIN (type) != NULL_TREE | |
4021 | && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE) | |
4022 | { | |
4023 | complete_array_type (&type, elt, false); | |
4024 | DECL_SIZE (decl) | |
4025 | = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type)); | |
4026 | DECL_SIZE_UNIT (decl) | |
4027 | = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type)); | |
4028 | } | |
4029 | } | |
1fd94215 | 4030 | \f |
a75b1c71 | 4031 | /* Decode a "typename", such as "int **", returning a ..._TYPE node. |
4032 | Set *EXPR, if EXPR not NULL, to any expression to be evaluated | |
4033 | before the type name, and set *EXPR_CONST_OPERANDS, if | |
4034 | EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may | |
4035 | appear in a constant expression. */ | |
51ef3909 | 4036 | |
4037 | tree | |
a75b1c71 | 4038 | groktypename (struct c_type_name *type_name, tree *expr, |
4039 | bool *expr_const_operands) | |
51ef3909 | 4040 | { |
ac206aff | 4041 | tree type; |
9553111d | 4042 | tree attrs = type_name->specs->attrs; |
9d45592a | 4043 | |
9553111d | 4044 | type_name->specs->attrs = NULL_TREE; |
9d45592a | 4045 | |
9553111d | 4046 | type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME, |
a75b1c71 | 4047 | false, NULL, &attrs, expr, expr_const_operands, |
4048 | DEPRECATED_NORMAL); | |
9d45592a | 4049 | |
4050 | /* Apply attributes. */ | |
ac206aff | 4051 | decl_attributes (&type, attrs, 0); |
9d45592a | 4052 | |
ac206aff | 4053 | return type; |
51ef3909 | 4054 | } |
4055 | ||
bc7bff74 | 4056 | /* Wrapper for decl_attributes that adds some implicit attributes |
4057 | to VAR_DECLs or FUNCTION_DECLs. */ | |
4058 | ||
4059 | static tree | |
4060 | c_decl_attributes (tree *node, tree attributes, int flags) | |
4061 | { | |
4062 | /* Add implicit "omp declare target" attribute if requested. */ | |
4063 | if (current_omp_declare_target_attribute | |
4064 | && ((TREE_CODE (*node) == VAR_DECL && TREE_STATIC (*node)) | |
4065 | || TREE_CODE (*node) == FUNCTION_DECL)) | |
4066 | { | |
4067 | if (TREE_CODE (*node) == VAR_DECL | |
4068 | && ((DECL_CONTEXT (*node) | |
4069 | && TREE_CODE (DECL_CONTEXT (*node)) == FUNCTION_DECL) | |
4070 | || (current_function_decl && !DECL_EXTERNAL (*node)))) | |
4071 | error ("%q+D in block scope inside of declare target directive", | |
4072 | *node); | |
4073 | else if (TREE_CODE (*node) == VAR_DECL | |
9ec099a3 | 4074 | && !lang_hooks.types.omp_mappable_type (TREE_TYPE (*node))) |
bc7bff74 | 4075 | error ("%q+D in declare target directive does not have mappable type", |
4076 | *node); | |
4077 | else | |
4078 | attributes = tree_cons (get_identifier ("omp declare target"), | |
4079 | NULL_TREE, attributes); | |
4080 | } | |
4081 | return decl_attributes (node, attributes, flags); | |
4082 | } | |
4083 | ||
4084 | ||
51ef3909 | 4085 | /* Decode a declarator in an ordinary declaration or data definition. |
4086 | This is called as soon as the type information and variable name | |
4087 | have been parsed, before parsing the initializer if any. | |
4088 | Here we create the ..._DECL node, fill in its type, | |
4089 | and put it on the list of decls for the current context. | |
4090 | The ..._DECL node is returned as the value. | |
4091 | ||
4092 | Exception: for arrays where the length is not specified, | |
4093 | the type is left null, to be filled in by `finish_decl'. | |
4094 | ||
4095 | Function definitions do not come here; they go to start_function | |
4096 | instead. However, external and forward declarations of functions | |
4097 | do go through here. Structure field declarations are done by | |
4098 | grokfield and not through here. */ | |
4099 | ||
51ef3909 | 4100 | tree |
9553111d | 4101 | start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs, |
ac206aff | 4102 | bool initialized, tree attributes) |
51ef3909 | 4103 | { |
88da234d | 4104 | tree decl; |
19cb6b50 | 4105 | tree tem; |
a75b1c71 | 4106 | tree expr = NULL_TREE; |
81f218ec | 4107 | enum deprecated_states deprecated_state = DEPRECATED_NORMAL; |
1cae46be | 4108 | |
88da234d | 4109 | /* An object declared as __attribute__((deprecated)) suppresses |
4110 | warnings of uses of other deprecated items. */ | |
4111 | if (lookup_attribute ("deprecated", attributes)) | |
4112 | deprecated_state = DEPRECATED_SUPPRESS; | |
4113 | ||
4114 | decl = grokdeclarator (declarator, declspecs, | |
a75b1c71 | 4115 | NORMAL, initialized, NULL, &attributes, &expr, NULL, |
81f218ec | 4116 | deprecated_state); |
61ba37bf | 4117 | if (!decl) |
4118 | return 0; | |
1cae46be | 4119 | |
a75b1c71 | 4120 | if (expr) |
c6333c6e | 4121 | add_stmt (fold_convert (void_type_node, expr)); |
a75b1c71 | 4122 | |
23efcc02 | 4123 | if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl))) |
3cf8b391 | 4124 | warning (OPT_Wmain, "%q+D is usually a function", decl); |
869a2569 | 4125 | |
51ef3909 | 4126 | if (initialized) |
4127 | /* Is it valid for this decl to have an initializer at all? | |
4128 | If not, set INITIALIZED to zero, which will indirectly | |
393b349a | 4129 | tell 'finish_decl' to ignore the initializer once it is parsed. */ |
51ef3909 | 4130 | switch (TREE_CODE (decl)) |
4131 | { | |
4132 | case TYPE_DECL: | |
b0b1af64 | 4133 | error ("typedef %qD is initialized (use __typeof__ instead)", decl); |
f6f89f14 | 4134 | initialized = 0; |
51ef3909 | 4135 | break; |
4136 | ||
4137 | case FUNCTION_DECL: | |
b0b1af64 | 4138 | error ("function %qD is initialized like a variable", decl); |
51ef3909 | 4139 | initialized = 0; |
4140 | break; | |
4141 | ||
4142 | case PARM_DECL: | |
4143 | /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */ | |
b0b1af64 | 4144 | error ("parameter %qD is initialized", decl); |
51ef3909 | 4145 | initialized = 0; |
4146 | break; | |
4147 | ||
4148 | default: | |
393b349a | 4149 | /* Don't allow initializations for incomplete types except for |
4150 | arrays which might be completed by the initialization. */ | |
ee5b587b | 4151 | |
393b349a | 4152 | /* This can happen if the array size is an undefined macro. |
4153 | We already gave a warning, so we don't need another one. */ | |
ee5b587b | 4154 | if (TREE_TYPE (decl) == error_mark_node) |
4155 | initialized = 0; | |
4156 | else if (COMPLETE_TYPE_P (TREE_TYPE (decl))) | |
51ef3909 | 4157 | { |
4158 | /* A complete type is ok if size is fixed. */ | |
4159 | ||
4160 | if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST | |
4161 | || C_DECL_VARIABLE_SIZE (decl)) | |
4162 | { | |
4163 | error ("variable-sized object may not be initialized"); | |
4164 | initialized = 0; | |
4165 | } | |
4166 | } | |
4167 | else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE) | |
4168 | { | |
b0b1af64 | 4169 | error ("variable %qD has initializer but incomplete type", decl); |
51ef3909 | 4170 | initialized = 0; |
4171 | } | |
5cbd179d | 4172 | else if (C_DECL_VARIABLE_SIZE (decl)) |
4173 | { | |
4174 | /* Although C99 is unclear about whether incomplete arrays | |
4175 | of VLAs themselves count as VLAs, it does not make | |
4176 | sense to permit them to be initialized given that | |
4177 | ordinary VLAs may not be initialized. */ | |
4178 | error ("variable-sized object may not be initialized"); | |
4179 | initialized = 0; | |
4180 | } | |
51ef3909 | 4181 | } |
4182 | ||
4183 | if (initialized) | |
4184 | { | |
393b349a | 4185 | if (current_scope == file_scope) |
51ef3909 | 4186 | TREE_STATIC (decl) = 1; |
4187 | ||
393b349a | 4188 | /* Tell 'pushdecl' this is an initialized decl |
51ef3909 | 4189 | even though we don't yet have the initializer expression. |
393b349a | 4190 | Also tell 'finish_decl' it may store the real initializer. */ |
51ef3909 | 4191 | DECL_INITIAL (decl) = error_mark_node; |
4192 | } | |
4193 | ||
4194 | /* If this is a function declaration, write a record describing it to the | |
4195 | prototypes file (if requested). */ | |
4196 | ||
4197 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
a36cf284 | 4198 | gen_aux_info_record (decl, 0, 0, prototype_p (TREE_TYPE (decl))); |
51ef3909 | 4199 | |
9493f142 | 4200 | /* ANSI specifies that a tentative definition which is not merged with |
4201 | a non-tentative definition behaves exactly like a definition with an | |
4202 | initializer equal to zero. (Section 3.7.2) | |
2a6f0f81 | 4203 | |
4204 | -fno-common gives strict ANSI behavior, though this tends to break | |
4205 | a large body of code that grew up without this rule. | |
4206 | ||
4207 | Thread-local variables are never common, since there's no entrenched | |
4208 | body of code to break, and it allows more efficient variable references | |
d716ce75 | 4209 | in the presence of dynamic linking. */ |
2a6f0f81 | 4210 | |
4211 | if (TREE_CODE (decl) == VAR_DECL | |
4212 | && !initialized | |
4213 | && TREE_PUBLIC (decl) | |
1b53eb20 | 4214 | && !DECL_THREAD_LOCAL_P (decl) |
2a6f0f81 | 4215 | && !flag_no_common) |
9493f142 | 4216 | DECL_COMMON (decl) = 1; |
7c090a86 | 4217 | |
431e45c6 | 4218 | /* Set attributes here so if duplicate decl, will have proper attributes. */ |
bc7bff74 | 4219 | c_decl_attributes (&decl, attributes, 0); |
431e45c6 | 4220 | |
541e4101 | 4221 | /* Handle gnu_inline attribute. */ |
4222 | if (declspecs->inline_p | |
11950bdd | 4223 | && !flag_gnu89_inline |
541e4101 | 4224 | && TREE_CODE (decl) == FUNCTION_DECL |
56f06eef | 4225 | && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl)) |
4226 | || current_function_decl)) | |
541e4101 | 4227 | { |
4228 | if (declspecs->storage_class == csc_auto && current_scope != file_scope) | |
4229 | ; | |
4230 | else if (declspecs->storage_class != csc_static) | |
4231 | DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl); | |
4232 | } | |
541e4101 | 4233 | |
45550790 | 4234 | if (TREE_CODE (decl) == FUNCTION_DECL |
4235 | && targetm.calls.promote_prototypes (TREE_TYPE (decl))) | |
4236 | { | |
ac206aff | 4237 | struct c_declarator *ce = declarator; |
45550790 | 4238 | |
ac206aff | 4239 | if (ce->kind == cdk_pointer) |
4240 | ce = declarator->declarator; | |
4241 | if (ce->kind == cdk_function) | |
45550790 | 4242 | { |
ac206aff | 4243 | tree args = ce->u.arg_info->parms; |
1767a056 | 4244 | for (; args; args = DECL_CHAIN (args)) |
45550790 | 4245 | { |
4246 | tree type = TREE_TYPE (args); | |
3ac12e63 | 4247 | if (type && INTEGRAL_TYPE_P (type) |
45550790 | 4248 | && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) |
b560fabd | 4249 | DECL_ARG_TYPE (args) = c_type_promotes_to (type); |
45550790 | 4250 | } |
4251 | } | |
4252 | } | |
4253 | ||
93f10b04 | 4254 | if (TREE_CODE (decl) == FUNCTION_DECL |
4255 | && DECL_DECLARED_INLINE_P (decl) | |
4256 | && DECL_UNINLINABLE (decl) | |
4257 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl))) | |
3cf8b391 | 4258 | warning (OPT_Wattributes, "inline function %q+D given attribute noinline", |
4259 | decl); | |
93f10b04 | 4260 | |
c42cc79e | 4261 | /* C99 6.7.4p3: An inline definition of a function with external |
4262 | linkage shall not contain a definition of a modifiable object | |
4263 | with static storage duration... */ | |
4264 | if (TREE_CODE (decl) == VAR_DECL | |
4265 | && current_scope != file_scope | |
4266 | && TREE_STATIC (decl) | |
c55e2943 | 4267 | && !TREE_READONLY (decl) |
c42cc79e | 4268 | && DECL_DECLARED_INLINE_P (current_function_decl) |
4269 | && DECL_EXTERNAL (current_function_decl)) | |
551ed71a | 4270 | record_inline_static (input_location, current_function_decl, |
4271 | decl, csi_modifiable); | |
c42cc79e | 4272 | |
e147d6aa | 4273 | if (c_dialect_objc () |
4274 | && (TREE_CODE (decl) == VAR_DECL | |
4275 | || TREE_CODE (decl) == FUNCTION_DECL)) | |
4276 | objc_check_global_decl (decl); | |
4277 | ||
6e899616 | 4278 | /* Add this decl to the current scope. |
51ef3909 | 4279 | TEM may equal DECL or it may be a previous decl of the same name. */ |
4280 | tem = pushdecl (decl); | |
4281 | ||
851ee249 | 4282 | if (initialized && DECL_EXTERNAL (tem)) |
4283 | { | |
4284 | DECL_EXTERNAL (tem) = 0; | |
4285 | TREE_STATIC (tem) = 1; | |
4286 | } | |
8dfad60e | 4287 | |
51ef3909 | 4288 | return tem; |
4289 | } | |
4290 | ||
980b024a | 4291 | /* Subroutine of finish_decl. TYPE is the type of an uninitialized object |
4292 | DECL or the non-array element type if DECL is an uninitialized array. | |
4293 | If that type has a const member, diagnose this. */ | |
4294 | ||
4295 | static void | |
4296 | diagnose_uninitialized_cst_member (tree decl, tree type) | |
4297 | { | |
4298 | tree field; | |
4299 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
4300 | { | |
4301 | tree field_type; | |
4302 | if (TREE_CODE (field) != FIELD_DECL) | |
4303 | continue; | |
4304 | field_type = strip_array_types (TREE_TYPE (field)); | |
4305 | ||
4306 | if (TYPE_QUALS (field_type) & TYPE_QUAL_CONST) | |
4307 | { | |
4308 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat, | |
4309 | "uninitialized const member in %qT is invalid in C++", | |
4310 | strip_array_types (TREE_TYPE (decl))); | |
4311 | inform (DECL_SOURCE_LOCATION (field), "%qD should be initialized", field); | |
4312 | } | |
4313 | ||
4314 | if (TREE_CODE (field_type) == RECORD_TYPE | |
4315 | || TREE_CODE (field_type) == UNION_TYPE) | |
4316 | diagnose_uninitialized_cst_member (decl, field_type); | |
4317 | } | |
4318 | } | |
4319 | ||
51ef3909 | 4320 | /* Finish processing of a declaration; |
4321 | install its initial value. | |
b9c74b4d | 4322 | If ORIGTYPE is not NULL_TREE, it is the original type of INIT. |
51ef3909 | 4323 | If the length of an array type is not known before, |
e60a6f7b | 4324 | it must be determined now, from the initial value, or it is an error. |
4325 | ||
4326 | INIT_LOC is the location of the initial value. */ | |
51ef3909 | 4327 | |
4328 | void | |
e60a6f7b | 4329 | finish_decl (tree decl, location_t init_loc, tree init, |
4330 | tree origtype, tree asmspec_tree) | |
51ef3909 | 4331 | { |
0dd13847 | 4332 | tree type; |
9eba252e | 4333 | bool was_incomplete = (DECL_SIZE (decl) == 0); |
44acf429 | 4334 | const char *asmspec = 0; |
51ef3909 | 4335 | |
1e625a2e | 4336 | /* If a name was specified, get the string. */ |
f3e21791 | 4337 | if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL) |
4338 | && DECL_FILE_SCOPE_P (decl)) | |
ea42c4de | 4339 | asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree); |
51ef3909 | 4340 | if (asmspec_tree) |
408ea82a | 4341 | asmspec = TREE_STRING_POINTER (asmspec_tree); |
51ef3909 | 4342 | |
1a4c44c5 | 4343 | if (TREE_CODE (decl) == VAR_DECL |
4344 | && TREE_STATIC (decl) | |
4345 | && global_bindings_p ()) | |
4346 | /* So decl is a global variable. Record the types it uses | |
4347 | so that we can decide later to emit debug info for them. */ | |
4348 | record_types_used_by_current_var_decl (decl); | |
4349 | ||
51ef3909 | 4350 | /* If `start_decl' didn't like having an initialization, ignore it now. */ |
51ef3909 | 4351 | if (init != 0 && DECL_INITIAL (decl) == 0) |
4352 | init = 0; | |
1cae46be | 4353 | |
51ef3909 | 4354 | /* Don't crash if parm is initialized. */ |
4355 | if (TREE_CODE (decl) == PARM_DECL) | |
4356 | init = 0; | |
4357 | ||
4358 | if (init) | |
e60a6f7b | 4359 | store_init_value (init_loc, decl, init, origtype); |
51ef3909 | 4360 | |
c17b85ea | 4361 | if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL |
b2c4af5e | 4362 | || TREE_CODE (decl) == FUNCTION_DECL |
4363 | || TREE_CODE (decl) == FIELD_DECL)) | |
c17b85ea | 4364 | objc_check_decl (decl); |
4365 | ||
0dd13847 | 4366 | type = TREE_TYPE (decl); |
4367 | ||
8b332087 | 4368 | /* Deduce size of array from initialization, if not already known. */ |
51ef3909 | 4369 | if (TREE_CODE (type) == ARRAY_TYPE |
4370 | && TYPE_DOMAIN (type) == 0 | |
4371 | && TREE_CODE (decl) != TYPE_DECL) | |
4372 | { | |
c271bdb2 | 4373 | bool do_default |
51ef3909 | 4374 | = (TREE_STATIC (decl) |
4375 | /* Even if pedantic, an external linkage array | |
4376 | may have incomplete type at first. */ | |
4377 | ? pedantic && !TREE_PUBLIC (decl) | |
5e58c22e | 4378 | : !DECL_EXTERNAL (decl)); |
51ef3909 | 4379 | int failure |
c271bdb2 | 4380 | = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl), |
4381 | do_default); | |
51ef3909 | 4382 | |
4383 | /* Get the completed type made by complete_array_type. */ | |
4384 | type = TREE_TYPE (decl); | |
4385 | ||
646a1d63 | 4386 | switch (failure) |
51ef3909 | 4387 | { |
646a1d63 | 4388 | case 1: |
3cf8b391 | 4389 | error ("initializer fails to determine size of %q+D", decl); |
646a1d63 | 4390 | break; |
4391 | ||
4392 | case 2: | |
51ef3909 | 4393 | if (do_default) |
3cf8b391 | 4394 | error ("array size missing in %q+D", decl); |
fc7d78c7 | 4395 | /* If a `static' var's size isn't known, |
4396 | make it extern as well as static, so it does not get | |
4397 | allocated. | |
4398 | If it is not `static', then do not mark extern; | |
4399 | finish_incomplete_decl will give it a default size | |
4400 | and it will get allocated. */ | |
84166705 | 4401 | else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl)) |
5e58c22e | 4402 | DECL_EXTERNAL (decl) = 1; |
646a1d63 | 4403 | break; |
4404 | ||
4405 | case 3: | |
3cf8b391 | 4406 | error ("zero or negative size array %q+D", decl); |
646a1d63 | 4407 | break; |
4408 | ||
4409 | case 0: | |
4410 | /* For global variables, update the copy of the type that | |
4411 | exists in the binding. */ | |
4412 | if (TREE_PUBLIC (decl)) | |
4413 | { | |
4414 | struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl)); | |
4415 | while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext)) | |
4416 | b_ext = b_ext->shadowed; | |
4417 | if (b_ext) | |
4418 | { | |
74a1cbcf | 4419 | if (b_ext->u.type && comptypes (b_ext->u.type, type)) |
f805d53d | 4420 | b_ext->u.type = composite_type (b_ext->u.type, type); |
646a1d63 | 4421 | else |
f805d53d | 4422 | b_ext->u.type = type; |
646a1d63 | 4423 | } |
4424 | } | |
4425 | break; | |
4426 | ||
4427 | default: | |
4428 | gcc_unreachable (); | |
51ef3909 | 4429 | } |
51ef3909 | 4430 | |
c271bdb2 | 4431 | if (DECL_INITIAL (decl)) |
4432 | TREE_TYPE (DECL_INITIAL (decl)) = type; | |
4433 | ||
d43c4681 | 4434 | relayout_decl (decl); |
51ef3909 | 4435 | } |
4436 | ||
4437 | if (TREE_CODE (decl) == VAR_DECL) | |
4438 | { | |
4287354c | 4439 | if (init && TREE_CODE (init) == CONSTRUCTOR) |
4440 | add_flexible_array_elts_to_size (decl, init); | |
4441 | ||
ee5b587b | 4442 | if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node |
4443 | && COMPLETE_TYPE_P (TREE_TYPE (decl))) | |
42aee427 | 4444 | layout_decl (decl, 0); |
4445 | ||
5905b12b | 4446 | if (DECL_SIZE (decl) == 0 |
ee5b587b | 4447 | /* Don't give an error if we already gave one earlier. */ |
4448 | && TREE_TYPE (decl) != error_mark_node | |
5905b12b | 4449 | && (TREE_STATIC (decl) |
b2c4af5e | 4450 | /* A static variable with an incomplete type |
4451 | is an error if it is initialized. | |
4452 | Also if it is not file scope. | |
4453 | Otherwise, let it through, but if it is not `extern' | |
4454 | then it may cause an error message later. */ | |
4455 | ? (DECL_INITIAL (decl) != 0 | |
3a2bf8d3 | 4456 | || !DECL_FILE_SCOPE_P (decl)) |
b2c4af5e | 4457 | /* An automatic variable with an incomplete type |
4458 | is an error. */ | |
4459 | : !DECL_EXTERNAL (decl))) | |
4460 | { | |
3cf8b391 | 4461 | error ("storage size of %q+D isn%'t known", decl); |
b2c4af5e | 4462 | TREE_TYPE (decl) = error_mark_node; |
4463 | } | |
51ef3909 | 4464 | |
5e58c22e | 4465 | if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl)) |
ad5a5207 | 4466 | && DECL_SIZE (decl) != 0) |
d645d7e9 | 4467 | { |
4468 | if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST) | |
4469 | constant_expression_warning (DECL_SIZE (decl)); | |
4470 | else | |
1f93c018 | 4471 | { |
4472 | error ("storage size of %q+D isn%'t constant", decl); | |
4473 | TREE_TYPE (decl) = error_mark_node; | |
4474 | } | |
d645d7e9 | 4475 | } |
0dbd1c74 | 4476 | |
4214af46 | 4477 | if (TREE_USED (type)) |
abc6c64f | 4478 | { |
4479 | TREE_USED (decl) = 1; | |
4480 | DECL_READ_P (decl) = 1; | |
4481 | } | |
51ef3909 | 4482 | } |
4483 | ||
d459e0d8 | 4484 | /* If this is a function and an assembler name is specified, reset DECL_RTL |
b9a16870 | 4485 | so we can give it its new name. Also, update builtin_decl if it |
d459e0d8 | 4486 | was a normal built-in. */ |
3eee62d8 | 4487 | if (TREE_CODE (decl) == FUNCTION_DECL && asmspec) |
4214af46 | 4488 | { |
d459e0d8 | 4489 | if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL) |
46a7e216 | 4490 | set_builtin_user_assembler_name (decl, asmspec); |
b2c4af5e | 4491 | set_user_assembler_name (decl, asmspec); |
4214af46 | 4492 | } |
3eee62d8 | 4493 | |
418089c3 | 4494 | /* If #pragma weak was used, mark the decl weak now. */ |
3656266b | 4495 | maybe_apply_pragma_weak (decl); |
418089c3 | 4496 | |
51ef3909 | 4497 | /* Output the assembler code and/or RTL code for variables and functions, |
4498 | unless the type is an undefined structure or union. | |
4499 | If not, it will get done when the type is completed. */ | |
4500 | ||
4501 | if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL) | |
4502 | { | |
4a2849cb | 4503 | /* Determine the ELF visibility. */ |
4504 | if (TREE_PUBLIC (decl)) | |
4505 | c_determine_visibility (decl); | |
4506 | ||
952e555e | 4507 | /* This is a no-op in c-lang.c or something real in objc-act.c. */ |
c0f19401 | 4508 | if (c_dialect_objc ()) |
952e555e | 4509 | objc_check_decl (decl); |
e41f0d80 | 4510 | |
a0c938f0 | 4511 | if (asmspec) |
b2c4af5e | 4512 | { |
4513 | /* If this is not a static variable, issue a warning. | |
4514 | It doesn't make any sense to give an ASMSPEC for an | |
4515 | ordinary, non-register local variable. Historically, | |
4516 | GCC has accepted -- but ignored -- the ASMSPEC in | |
4517 | this case. */ | |
84166705 | 4518 | if (!DECL_FILE_SCOPE_P (decl) |
b2c4af5e | 4519 | && TREE_CODE (decl) == VAR_DECL |
4520 | && !C_DECL_REGISTER (decl) | |
4521 | && !TREE_STATIC (decl)) | |
3cf8b391 | 4522 | warning (0, "ignoring asm-specifier for non-static local " |
4523 | "variable %q+D", decl); | |
b2c4af5e | 4524 | else |
4525 | set_user_assembler_name (decl, asmspec); | |
4526 | } | |
a0c938f0 | 4527 | |
3a2bf8d3 | 4528 | if (DECL_FILE_SCOPE_P (decl)) |
0986aa2c | 4529 | { |
4530 | if (DECL_INITIAL (decl) == NULL_TREE | |
4531 | || DECL_INITIAL (decl) == error_mark_node) | |
4532 | /* Don't output anything | |
4533 | when a tentative file-scope definition is seen. | |
4534 | But at end of compilation, do output code for them. */ | |
4535 | DECL_DEFER_OUTPUT (decl) = 1; | |
2be90eed | 4536 | if (asmspec && C_DECL_REGISTER (decl)) |
4537 | DECL_HARD_REGISTER (decl) = 1; | |
b2c4af5e | 4538 | rest_of_decl_compilation (decl, true, 0); |
0986aa2c | 4539 | } |
e41f0d80 | 4540 | else |
4541 | { | |
b2c4af5e | 4542 | /* In conjunction with an ASMSPEC, the `register' |
4543 | keyword indicates that we should place the variable | |
4544 | in a particular register. */ | |
4545 | if (asmspec && C_DECL_REGISTER (decl)) | |
ace65efd | 4546 | { |
b2c4af5e | 4547 | DECL_HARD_REGISTER (decl) = 1; |
4548 | /* This cannot be done for a structure with volatile | |
4549 | fields, on which DECL_REGISTER will have been | |
4550 | reset. */ | |
4551 | if (!DECL_REGISTER (decl)) | |
4552 | error ("cannot put object with volatile field into register"); | |
ace65efd | 4553 | } |
cd5abf58 | 4554 | |
baf262a5 | 4555 | if (TREE_CODE (decl) != FUNCTION_DECL) |
2e3f4877 | 4556 | { |
4557 | /* If we're building a variable sized type, and we might be | |
4558 | reachable other than via the top of the current binding | |
4559 | level, then create a new BIND_EXPR so that we deallocate | |
4560 | the object at the right time. */ | |
4561 | /* Note that DECL_SIZE can be null due to errors. */ | |
4562 | if (DECL_SIZE (decl) | |
4563 | && !TREE_CONSTANT (DECL_SIZE (decl)) | |
4564 | && STATEMENT_LIST_HAS_LABEL (cur_stmt_list)) | |
4565 | { | |
4566 | tree bind; | |
14ae0310 | 4567 | bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL); |
2e3f4877 | 4568 | TREE_SIDE_EFFECTS (bind) = 1; |
4569 | add_stmt (bind); | |
4570 | BIND_EXPR_BODY (bind) = push_stmt_list (); | |
4571 | } | |
e60a6f7b | 4572 | add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), |
4573 | DECL_EXPR, decl)); | |
2e3f4877 | 4574 | } |
e41f0d80 | 4575 | } |
a0c938f0 | 4576 | |
f8b540f2 | 4577 | |
3a2bf8d3 | 4578 | if (!DECL_FILE_SCOPE_P (decl)) |
51ef3909 | 4579 | { |
4580 | /* Recompute the RTL of a local array now | |
4581 | if it used to be an incomplete type. */ | |
4582 | if (was_incomplete | |
84166705 | 4583 | && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl)) |
51ef3909 | 4584 | { |
4585 | /* If we used it already as memory, it must stay in memory. */ | |
4586 | TREE_ADDRESSABLE (decl) = TREE_USED (decl); | |
4587 | /* If it's still incomplete now, no init will save it. */ | |
4588 | if (DECL_SIZE (decl) == 0) | |
4589 | DECL_INITIAL (decl) = 0; | |
51ef3909 | 4590 | } |
51ef3909 | 4591 | } |
4592 | } | |
4593 | ||
4594 | if (TREE_CODE (decl) == TYPE_DECL) | |
ab7083b0 | 4595 | { |
4596 | if (!DECL_FILE_SCOPE_P (decl) | |
1f8a6ff8 | 4597 | && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) |
e60a6f7b | 4598 | add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl)); |
ab7083b0 | 4599 | |
b2c4af5e | 4600 | rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0); |
ab7083b0 | 4601 | } |
51ef3909 | 4602 | |
7acb29a3 | 4603 | /* Install a cleanup (aka destructor) if one was given. */ |
4604 | if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl)) | |
4605 | { | |
4606 | tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl)); | |
4607 | if (attr) | |
4608 | { | |
7acb29a3 | 4609 | tree cleanup_id = TREE_VALUE (TREE_VALUE (attr)); |
4610 | tree cleanup_decl = lookup_name (cleanup_id); | |
4611 | tree cleanup; | |
f1f41a6c | 4612 | vec<tree, va_gc> *v; |
7acb29a3 | 4613 | |
4614 | /* Build "cleanup(&decl)" for the destructor. */ | |
b6889cb0 | 4615 | cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0); |
f1f41a6c | 4616 | vec_alloc (v, 1); |
4617 | v->quick_push (cleanup); | |
5a672e62 | 4618 | cleanup = c_build_function_call_vec (DECL_SOURCE_LOCATION (decl), |
4619 | vNULL, cleanup_decl, v, NULL); | |
f1f41a6c | 4620 | vec_free (v); |
7acb29a3 | 4621 | |
4622 | /* Don't warn about decl unused; the cleanup uses it. */ | |
4623 | TREE_USED (decl) = 1; | |
2363ef00 | 4624 | TREE_USED (cleanup_decl) = 1; |
abc6c64f | 4625 | DECL_READ_P (decl) = 1; |
7acb29a3 | 4626 | |
2363ef00 | 4627 | push_cleanup (decl, cleanup, false); |
7acb29a3 | 4628 | } |
4629 | } | |
1a7c0ccb | 4630 | |
4631 | if (warn_cxx_compat | |
4632 | && TREE_CODE (decl) == VAR_DECL | |
1a7c0ccb | 4633 | && !DECL_EXTERNAL (decl) |
4634 | && DECL_INITIAL (decl) == NULL_TREE) | |
980b024a | 4635 | { |
4636 | type = strip_array_types (type); | |
4637 | if (TREE_READONLY (decl)) | |
4638 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat, | |
4639 | "uninitialized const %qD is invalid in C++", decl); | |
4640 | else if ((TREE_CODE (type) == RECORD_TYPE | |
4641 | || TREE_CODE (type) == UNION_TYPE) | |
4642 | && C_TYPE_FIELDS_READONLY (type)) | |
4643 | diagnose_uninitialized_cst_member (decl, type); | |
4644 | } | |
e4ae859d | 4645 | |
4646 | invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl); | |
51ef3909 | 4647 | } |
4648 | ||
4232a958 | 4649 | /* Given a parsed parameter declaration, decode it into a PARM_DECL. |
4650 | EXPR is NULL or a pointer to an expression that needs to be | |
4651 | evaluated for the side effects of array size expressions in the | |
4652 | parameters. */ | |
7c42cc36 | 4653 | |
4654 | tree | |
4232a958 | 4655 | grokparm (const struct c_parm *parm, tree *expr) |
7c42cc36 | 4656 | { |
e47ffaae | 4657 | tree attrs = parm->attrs; |
ac206aff | 4658 | tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, |
4232a958 | 4659 | NULL, &attrs, expr, NULL, DEPRECATED_NORMAL); |
7c42cc36 | 4660 | |
e47ffaae | 4661 | decl_attributes (&decl, attrs, 0); |
7c42cc36 | 4662 | |
4663 | return decl; | |
4664 | } | |
4665 | ||
f74be9a1 | 4666 | /* Given a parsed parameter declaration, decode it into a PARM_DECL |
4232a958 | 4667 | and push that on the current scope. EXPR is a pointer to an |
4668 | expression that needs to be evaluated for the side effects of array | |
4669 | size expressions in the parameters. */ | |
51ef3909 | 4670 | |
4671 | void | |
4232a958 | 4672 | push_parm_decl (const struct c_parm *parm, tree *expr) |
51ef3909 | 4673 | { |
e47ffaae | 4674 | tree attrs = parm->attrs; |
13b566b4 | 4675 | tree decl; |
b3924a2c | 4676 | |
81f218ec | 4677 | decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL, |
4232a958 | 4678 | &attrs, expr, NULL, DEPRECATED_NORMAL); |
e47ffaae | 4679 | decl_attributes (&decl, attrs, 0); |
195f9646 | 4680 | |
51ef3909 | 4681 | decl = pushdecl (decl); |
4682 | ||
e60a6f7b | 4683 | finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE); |
51ef3909 | 4684 | } |
4685 | ||
393b349a | 4686 | /* Mark all the parameter declarations to date as forward decls. |
3bdb6310 | 4687 | Also diagnose use of this extension. */ |
51ef3909 | 4688 | |
4689 | void | |
f74be9a1 | 4690 | mark_forward_parm_decls (void) |
51ef3909 | 4691 | { |
393b349a | 4692 | struct c_binding *b; |
f74be9a1 | 4693 | |
4694 | if (pedantic && !current_scope->warned_forward_parm_decls) | |
4695 | { | |
29438999 | 4696 | pedwarn (input_location, OPT_Wpedantic, |
21ca8540 | 4697 | "ISO C forbids forward parameter declarations"); |
f74be9a1 | 4698 | current_scope->warned_forward_parm_decls = true; |
4699 | } | |
4700 | ||
393b349a | 4701 | for (b = current_scope->bindings; b; b = b->prev) |
4702 | if (TREE_CODE (b->decl) == PARM_DECL) | |
4703 | TREE_ASM_WRITTEN (b->decl) = 1; | |
51ef3909 | 4704 | } |
4705 | \f | |
ec11e38e | 4706 | /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound |
4707 | literal, which may be an incomplete array type completed by the | |
e60a6f7b | 4708 | initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound |
a75b1c71 | 4709 | literal. NON_CONST is true if the initializers contain something |
4710 | that cannot occur in a constant expression. */ | |
ec11e38e | 4711 | |
4712 | tree | |
e60a6f7b | 4713 | build_compound_literal (location_t loc, tree type, tree init, bool non_const) |
ec11e38e | 4714 | { |
4715 | /* We do not use start_decl here because we have a type, not a declarator; | |
4716 | and do not use finish_decl because the decl should be stored inside | |
7dd37241 | 4717 | the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */ |
5cbd179d | 4718 | tree decl; |
ec11e38e | 4719 | tree complit; |
fccd796a | 4720 | tree stmt; |
5cbd179d | 4721 | |
47321b26 | 4722 | if (type == error_mark_node |
4723 | || init == error_mark_node) | |
5cbd179d | 4724 | return error_mark_node; |
4725 | ||
e60a6f7b | 4726 | decl = build_decl (loc, VAR_DECL, NULL_TREE, type); |
ec11e38e | 4727 | DECL_EXTERNAL (decl) = 0; |
4728 | TREE_PUBLIC (decl) = 0; | |
393b349a | 4729 | TREE_STATIC (decl) = (current_scope == file_scope); |
ec11e38e | 4730 | DECL_CONTEXT (decl) = current_function_decl; |
4731 | TREE_USED (decl) = 1; | |
abc6c64f | 4732 | DECL_READ_P (decl) = 1; |
ec11e38e | 4733 | TREE_TYPE (decl) = type; |
73242672 | 4734 | TREE_READONLY (decl) = (TYPE_READONLY (type) |
4735 | || (TREE_CODE (type) == ARRAY_TYPE | |
4736 | && TYPE_READONLY (TREE_TYPE (type)))); | |
e60a6f7b | 4737 | store_init_value (loc, decl, init, NULL_TREE); |
ec11e38e | 4738 | |
4739 | if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type)) | |
4740 | { | |
c271bdb2 | 4741 | int failure = complete_array_type (&TREE_TYPE (decl), |
4742 | DECL_INITIAL (decl), true); | |
05e8f674 | 4743 | /* If complete_array_type returns 3, it means that the |
4744 | initial value of the compound literal is empty. Allow it. */ | |
4745 | gcc_assert (failure == 0 || failure == 3); | |
c271bdb2 | 4746 | |
4747 | type = TREE_TYPE (decl); | |
4748 | TREE_TYPE (DECL_INITIAL (decl)) = type; | |
ec11e38e | 4749 | } |
4750 | ||
ec11e38e | 4751 | if (type == error_mark_node || !COMPLETE_TYPE_P (type)) |
4269c49c | 4752 | { |
4753 | c_incomplete_type_error (NULL_TREE, type); | |
4754 | return error_mark_node; | |
4755 | } | |
ec11e38e | 4756 | |
e60a6f7b | 4757 | stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl); |
c271bdb2 | 4758 | complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt); |
ec11e38e | 4759 | TREE_SIDE_EFFECTS (complit) = 1; |
4760 | ||
4761 | layout_decl (decl, 0); | |
4762 | ||
4763 | if (TREE_STATIC (decl)) | |
4764 | { | |
79b01846 | 4765 | /* This decl needs a name for the assembler output. */ |
4766 | set_compound_literal_name (decl); | |
9a7bab7f | 4767 | DECL_DEFER_OUTPUT (decl) = 1; |
4768 | DECL_COMDAT (decl) = 1; | |
4769 | DECL_ARTIFICIAL (decl) = 1; | |
553acd9c | 4770 | DECL_IGNORED_P (decl) = 1; |
9a7bab7f | 4771 | pushdecl (decl); |
b2c4af5e | 4772 | rest_of_decl_compilation (decl, 1, 0); |
ec11e38e | 4773 | } |
4774 | ||
a75b1c71 | 4775 | if (non_const) |
4776 | { | |
4777 | complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit); | |
4778 | C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1; | |
4779 | } | |
4780 | ||
ec11e38e | 4781 | return complit; |
4782 | } | |
0b09525f | 4783 | |
4784 | /* Check the type of a compound literal. Here we just check that it | |
4785 | is valid for C++. */ | |
4786 | ||
4787 | void | |
e60a6f7b | 4788 | check_compound_literal_type (location_t loc, struct c_type_name *type_name) |
0b09525f | 4789 | { |
ae5ead32 | 4790 | if (warn_cxx_compat |
4791 | && (type_name->specs->typespec_kind == ctsk_tagdef | |
4792 | || type_name->specs->typespec_kind == ctsk_tagfirstref)) | |
0b09525f | 4793 | warning_at (loc, OPT_Wc___compat, |
4794 | "defining a type in a compound literal is invalid in C++"); | |
4795 | } | |
ec11e38e | 4796 | \f |
ce09bc13 | 4797 | /* Determine whether TYPE is a structure with a flexible array member, |
4798 | or a union containing such a structure (possibly recursively). */ | |
4799 | ||
4800 | static bool | |
1cae46be | 4801 | flexible_array_type_p (tree type) |
ce09bc13 | 4802 | { |
4803 | tree x; | |
4804 | switch (TREE_CODE (type)) | |
4805 | { | |
4806 | case RECORD_TYPE: | |
4807 | x = TYPE_FIELDS (type); | |
4808 | if (x == NULL_TREE) | |
4809 | return false; | |
1767a056 | 4810 | while (DECL_CHAIN (x) != NULL_TREE) |
4811 | x = DECL_CHAIN (x); | |
ce09bc13 | 4812 | if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE |
4813 | && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE | |
4814 | && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE | |
4815 | && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE) | |
4816 | return true; | |
4817 | return false; | |
4818 | case UNION_TYPE: | |
1767a056 | 4819 | for (x = TYPE_FIELDS (type); x != NULL_TREE; x = DECL_CHAIN (x)) |
ce09bc13 | 4820 | { |
4821 | if (flexible_array_type_p (TREE_TYPE (x))) | |
4822 | return true; | |
4823 | } | |
4824 | return false; | |
4825 | default: | |
4826 | return false; | |
4827 | } | |
4828 | } | |
4829 | \f | |
2d1a2840 | 4830 | /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME, |
4831 | replacing with appropriate values if they are invalid. */ | |
4832 | static void | |
d1dd9ac0 | 4833 | check_bitfield_type_and_width (tree *type, tree *width, tree orig_name) |
2d1a2840 | 4834 | { |
4835 | tree type_mv; | |
4836 | unsigned int max_width; | |
4837 | unsigned HOST_WIDE_INT w; | |
d1dd9ac0 | 4838 | const char *name = (orig_name |
4839 | ? identifier_to_locale (IDENTIFIER_POINTER (orig_name)) | |
4840 | : _("<anonymous>")); | |
2d1a2840 | 4841 | |
2d1a2840 | 4842 | /* Detect and ignore out of range field width and process valid |
4843 | field widths. */ | |
59dc2654 | 4844 | if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))) |
2d1a2840 | 4845 | { |
b0b1af64 | 4846 | error ("bit-field %qs width not an integer constant", name); |
2d1a2840 | 4847 | *width = integer_one_node; |
4848 | } | |
4849 | else | |
4850 | { | |
59dc2654 | 4851 | if (TREE_CODE (*width) != INTEGER_CST) |
4852 | { | |
4853 | *width = c_fully_fold (*width, false, NULL); | |
4854 | if (TREE_CODE (*width) == INTEGER_CST) | |
29438999 | 4855 | pedwarn (input_location, OPT_Wpedantic, |
59dc2654 | 4856 | "bit-field %qs width not an integer constant expression", |
4857 | name); | |
4858 | } | |
4859 | if (TREE_CODE (*width) != INTEGER_CST) | |
4860 | { | |
4861 | error ("bit-field %qs width not an integer constant", name); | |
4862 | *width = integer_one_node; | |
4863 | } | |
2d1a2840 | 4864 | constant_expression_warning (*width); |
4865 | if (tree_int_cst_sgn (*width) < 0) | |
4866 | { | |
b0b1af64 | 4867 | error ("negative width in bit-field %qs", name); |
2d1a2840 | 4868 | *width = integer_one_node; |
4869 | } | |
4870 | else if (integer_zerop (*width) && orig_name) | |
4871 | { | |
b0b1af64 | 4872 | error ("zero width for bit-field %qs", name); |
2d1a2840 | 4873 | *width = integer_one_node; |
4874 | } | |
4875 | } | |
4876 | ||
4877 | /* Detect invalid bit-field type. */ | |
4878 | if (TREE_CODE (*type) != INTEGER_TYPE | |
4879 | && TREE_CODE (*type) != BOOLEAN_TYPE | |
4880 | && TREE_CODE (*type) != ENUMERAL_TYPE) | |
4881 | { | |
b0b1af64 | 4882 | error ("bit-field %qs has invalid type", name); |
2d1a2840 | 4883 | *type = unsigned_type_node; |
4884 | } | |
4885 | ||
4886 | type_mv = TYPE_MAIN_VARIANT (*type); | |
3df42822 | 4887 | if (!in_system_header_at (input_location) |
2d1a2840 | 4888 | && type_mv != integer_type_node |
4889 | && type_mv != unsigned_type_node | |
890c2e2f | 4890 | && type_mv != boolean_type_node) |
4891 | pedwarn_c90 (input_location, OPT_Wpedantic, | |
4892 | "type of bit-field %qs is a GCC extension", name); | |
2d1a2840 | 4893 | |
c17154eb | 4894 | max_width = TYPE_PRECISION (*type); |
2d1a2840 | 4895 | |
4896 | if (0 < compare_tree_int (*width, max_width)) | |
4897 | { | |
b0b1af64 | 4898 | error ("width of %qs exceeds its type", name); |
2d1a2840 | 4899 | w = max_width; |
ceb7b692 | 4900 | *width = build_int_cst (integer_type_node, w); |
2d1a2840 | 4901 | } |
4902 | else | |
e913b5cd | 4903 | w = tree_to_uhwi (*width); |
2d1a2840 | 4904 | |
4ee9c684 | 4905 | if (TREE_CODE (*type) == ENUMERAL_TYPE) |
4906 | { | |
4907 | struct lang_type *lt = TYPE_LANG_SPECIFIC (*type); | |
14338e9a | 4908 | if (!lt |
e913b5cd | 4909 | || w < tree_int_cst_min_precision (lt->enum_min, TYPE_SIGN (*type)) |
4910 | || w < tree_int_cst_min_precision (lt->enum_max, TYPE_SIGN (*type))) | |
c3ceba8e | 4911 | warning (0, "%qs is narrower than values of its type", name); |
4ee9c684 | 4912 | } |
2d1a2840 | 4913 | } |
2ac1e110 | 4914 | |
2d1a2840 | 4915 | \f |
aaafd660 | 4916 | |
4917 | /* Print warning about variable length array if necessary. */ | |
4918 | ||
4919 | static void | |
d1dd9ac0 | 4920 | warn_variable_length_array (tree name, tree size) |
aaafd660 | 4921 | { |
806fe15e | 4922 | if (TREE_CONSTANT (size)) |
aaafd660 | 4923 | { |
890c2e2f | 4924 | if (name) |
806fe15e | 4925 | pedwarn_c90 (input_location, OPT_Wvla, |
d1dd9ac0 | 4926 | "ISO C90 forbids array %qE whose size " |
890c2e2f | 4927 | "can%'t be evaluated", name); |
aaafd660 | 4928 | else |
806fe15e | 4929 | pedwarn_c90 (input_location, OPT_Wvla, "ISO C90 forbids array " |
890c2e2f | 4930 | "whose size can%'t be evaluated"); |
aaafd660 | 4931 | } |
890c2e2f | 4932 | else |
aaafd660 | 4933 | { |
890c2e2f | 4934 | if (name) |
806fe15e | 4935 | pedwarn_c90 (input_location, OPT_Wvla, |
890c2e2f | 4936 | "ISO C90 forbids variable length array %qE", name); |
aaafd660 | 4937 | else |
806fe15e | 4938 | pedwarn_c90 (input_location, OPT_Wvla, "ISO C90 forbids variable " |
890c2e2f | 4939 | "length array"); |
aaafd660 | 4940 | } |
4941 | } | |
4942 | ||
508ea33a | 4943 | /* Print warning about defaulting to int if necessary. */ |
4944 | ||
4945 | static void | |
4946 | warn_defaults_to (location_t location, int opt, const char *gmsgid, ...) | |
4947 | { | |
4948 | diagnostic_info diagnostic; | |
4949 | va_list ap; | |
4950 | ||
4951 | va_start (ap, gmsgid); | |
4952 | diagnostic_set_info (&diagnostic, gmsgid, &ap, location, | |
4953 | flag_isoc99 ? DK_PEDWARN : DK_WARNING); | |
4954 | diagnostic.option_index = opt; | |
4955 | report_diagnostic (&diagnostic); | |
4956 | va_end (ap); | |
4957 | } | |
4958 | ||
51ef3909 | 4959 | /* Given declspecs and a declarator, |
4960 | determine the name and type of the object declared | |
4961 | and construct a ..._DECL node for it. | |
4962 | (In one case we can return a ..._TYPE node instead. | |
4963 | For invalid input we sometimes return 0.) | |
4964 | ||
9553111d | 4965 | DECLSPECS is a c_declspecs structure for the declaration specifiers. |
51ef3909 | 4966 | |
4967 | DECL_CONTEXT says which syntactic context this declaration is in: | |
4968 | NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL. | |
4969 | FUNCDEF for a function definition. Like NORMAL but a few different | |
4970 | error messages in each case. Return value may be zero meaning | |
4971 | this definition is too screwy to try to parse. | |
4972 | PARM for a parameter declaration (either within a function prototype | |
4973 | or before a function body). Make a PARM_DECL, or return void_type_node. | |
4974 | TYPENAME if for a typename (in a cast or sizeof). | |
4975 | Don't make a DECL node; just return the ..._TYPE node. | |
4976 | FIELD for a struct or union field; make a FIELD_DECL. | |
4a125bfc | 4977 | INITIALIZED is true if the decl has an initializer. |
2d1a2840 | 4978 | WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node |
4979 | representing the width of the bit-field. | |
e47ffaae | 4980 | DECL_ATTRS points to the list of attributes that should be added to this |
4981 | decl. Any nested attributes that belong on the decl itself will be | |
4982 | added to this list. | |
a75b1c71 | 4983 | If EXPR is not NULL, any expressions that need to be evaluated as |
4984 | part of evaluating variably modified types will be stored in *EXPR. | |
4985 | If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be | |
4986 | set to indicate whether operands in *EXPR can be used in constant | |
4987 | expressions. | |
81f218ec | 4988 | DEPRECATED_STATE is a deprecated_states value indicating whether |
4989 | deprecation warnings should be suppressed. | |
51ef3909 | 4990 | |
4991 | In the TYPENAME case, DECLARATOR is really an absolute declarator. | |
4992 | It may also be so in the PARM case, for a prototype where the | |
4993 | argument type is specified but not the name. | |
4994 | ||
4995 | This function is where the complicated C meanings of `static' | |
08f8d953 | 4996 | and `extern' are interpreted. */ |
51ef3909 | 4997 | |
4998 | static tree | |
9553111d | 4999 | grokdeclarator (const struct c_declarator *declarator, |
5000 | struct c_declspecs *declspecs, | |
81f218ec | 5001 | enum decl_context decl_context, bool initialized, tree *width, |
a75b1c71 | 5002 | tree *decl_attrs, tree *expr, bool *expr_const_operands, |
5003 | enum deprecated_states deprecated_state) | |
51ef3909 | 5004 | { |
9553111d | 5005 | tree type = declspecs->type; |
feb04535 | 5006 | bool threadp = declspecs->thread_p; |
5007 | enum c_storage_class storage_class = declspecs->storage_class; | |
51ef3909 | 5008 | int constp; |
a5b1863e | 5009 | int restrictp; |
51ef3909 | 5010 | int volatilep; |
b560fabd | 5011 | int atomicp; |
a5b1863e | 5012 | int type_quals = TYPE_UNQUALIFIED; |
d1dd9ac0 | 5013 | tree name = NULL_TREE; |
32d33ab2 | 5014 | bool funcdef_flag = false; |
ac206aff | 5015 | bool funcdef_syntax = false; |
b99f3c92 | 5016 | bool size_varies = false; |
70dd11f7 | 5017 | tree decl_attr = declspecs->decl_attr; |
bb476216 | 5018 | int array_ptr_quals = TYPE_UNQUALIFIED; |
5019 | tree array_ptr_attrs = NULL_TREE; | |
1fd94215 | 5020 | int array_parm_static = 0; |
32d33ab2 | 5021 | bool array_parm_vla_unspec_p = false; |
e3c541f0 | 5022 | tree returned_attrs = NULL_TREE; |
2d1a2840 | 5023 | bool bitfield = width != NULL; |
0b351ac2 | 5024 | tree element_type; |
ac206aff | 5025 | struct c_arg_info *arg_info = 0; |
6d5d708e | 5026 | addr_space_t as1, as2, address_space; |
e60a6f7b | 5027 | location_t loc = UNKNOWN_LOCATION; |
2b3c93a3 | 5028 | const char *errmsg; |
a75b1c71 | 5029 | tree expr_dummy; |
5030 | bool expr_const_operands_dummy; | |
4c59b58b | 5031 | enum c_declarator_kind first_non_attr_kind; |
83e25171 | 5032 | unsigned int alignas_align = 0; |
a75b1c71 | 5033 | |
26ee9e7a | 5034 | if (TREE_CODE (type) == ERROR_MARK) |
5035 | return error_mark_node; | |
a75b1c71 | 5036 | if (expr == NULL) |
5037 | expr = &expr_dummy; | |
5038 | if (expr_const_operands == NULL) | |
5039 | expr_const_operands = &expr_const_operands_dummy; | |
5040 | ||
5041 | *expr = declspecs->expr; | |
5042 | *expr_const_operands = declspecs->expr_const_operands; | |
51ef3909 | 5043 | |
5044 | if (decl_context == FUNCDEF) | |
32d33ab2 | 5045 | funcdef_flag = true, decl_context = NORMAL; |
51ef3909 | 5046 | |
51ef3909 | 5047 | /* Look inside a declarator for the name being declared |
d1dd9ac0 | 5048 | and get it as an IDENTIFIER_NODE, for an error message. */ |
51ef3909 | 5049 | { |
ac206aff | 5050 | const struct c_declarator *decl = declarator; |
51ef3909 | 5051 | |
4c59b58b | 5052 | first_non_attr_kind = cdk_attrs; |
51ef3909 | 5053 | while (decl) |
ac206aff | 5054 | switch (decl->kind) |
51ef3909 | 5055 | { |
ac206aff | 5056 | case cdk_array: |
e60a6f7b | 5057 | loc = decl->id_loc; |
5058 | /* FALL THRU. */ | |
5059 | ||
5060 | case cdk_function: | |
ac206aff | 5061 | case cdk_pointer: |
5062 | funcdef_syntax = (decl->kind == cdk_function); | |
5063 | decl = decl->declarator; | |
4c59b58b | 5064 | if (first_non_attr_kind == cdk_attrs) |
5065 | first_non_attr_kind = decl->kind; | |
51ef3909 | 5066 | break; |
5067 | ||
ac206aff | 5068 | case cdk_attrs: |
5069 | decl = decl->declarator; | |
e3c541f0 | 5070 | break; |
5071 | ||
ac206aff | 5072 | case cdk_id: |
e60a6f7b | 5073 | loc = decl->id_loc; |
ac206aff | 5074 | if (decl->u.id) |
d1dd9ac0 | 5075 | name = decl->u.id; |
4c59b58b | 5076 | if (first_non_attr_kind == cdk_attrs) |
5077 | first_non_attr_kind = decl->kind; | |
51ef3909 | 5078 | decl = 0; |
5079 | break; | |
5080 | ||
5081 | default: | |
231bd014 | 5082 | gcc_unreachable (); |
51ef3909 | 5083 | } |
5084 | if (name == 0) | |
d1dd9ac0 | 5085 | { |
5086 | gcc_assert (decl_context == PARM | |
5087 | || decl_context == TYPENAME | |
5088 | || (decl_context == FIELD | |
5089 | && declarator->kind == cdk_id)); | |
5090 | gcc_assert (!initialized); | |
5091 | } | |
51ef3909 | 5092 | } |
5093 | ||
5094 | /* A function definition's declarator must have the form of | |
5095 | a function declarator. */ | |
5096 | ||
ac206aff | 5097 | if (funcdef_flag && !funcdef_syntax) |
51ef3909 | 5098 | return 0; |
5099 | ||
51ef3909 | 5100 | /* If this looks like a function definition, make it one, |
5101 | even if it occurs where parms are expected. | |
5102 | Then store_parm_decls will reject it and not use it as a parm. */ | |
393b349a | 5103 | if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag) |
51ef3909 | 5104 | decl_context = PARM; |
5105 | ||
9553111d | 5106 | if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS) |
45c4e798 | 5107 | warn_deprecated_use (declspecs->type, declspecs->decl_attr); |
51ef3909 | 5108 | |
dc95eae2 | 5109 | if ((decl_context == NORMAL || decl_context == FIELD) |
5110 | && current_scope == file_scope | |
5111 | && variably_modified_type_p (type, NULL_TREE)) | |
5112 | { | |
d1dd9ac0 | 5113 | if (name) |
e60a6f7b | 5114 | error_at (loc, "variably modified %qE at file scope", name); |
d1dd9ac0 | 5115 | else |
e60a6f7b | 5116 | error_at (loc, "variably modified field at file scope"); |
dc95eae2 | 5117 | type = integer_type_node; |
5118 | } | |
5119 | ||
b99f3c92 | 5120 | size_varies = C_TYPE_VARIABLE_SIZE (type) != 0; |
51ef3909 | 5121 | |
70dd11f7 | 5122 | /* Diagnose defaulting to "int". */ |
65a8b580 | 5123 | |
3df42822 | 5124 | if (declspecs->default_int_p && !in_system_header_at (input_location)) |
51ef3909 | 5125 | { |
70dd11f7 | 5126 | /* Issue a warning if this is an ISO C 99 program or if |
5127 | -Wreturn-type and this is a function, or if -Wimplicit; | |
5128 | prefer the former warning since it is more explicit. */ | |
5129 | if ((warn_implicit_int || warn_return_type || flag_isoc99) | |
5130 | && funcdef_flag) | |
5131 | warn_about_return_type = 1; | |
d1dd9ac0 | 5132 | else |
5133 | { | |
5134 | if (name) | |
508ea33a | 5135 | warn_defaults_to (loc, flag_isoc99 ? 0 : OPT_Wimplicit_int, |
5136 | "type defaults to %<int%> in declaration " | |
5137 | "of %qE", name); | |
d1dd9ac0 | 5138 | else |
508ea33a | 5139 | warn_defaults_to (loc, flag_isoc99 ? 0 : OPT_Wimplicit_int, |
5140 | "type defaults to %<int%> in type name"); | |
d1dd9ac0 | 5141 | } |
51ef3909 | 5142 | } |
5143 | ||
70dd11f7 | 5144 | /* Adjust the type if a bit-field is being declared, |
5145 | -funsigned-bitfields applied and the type is not explicitly | |
5146 | "signed". */ | |
5147 | if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p | |
5148 | && TREE_CODE (type) == INTEGER_TYPE) | |
75a70cf9 | 5149 | type = unsigned_type_for (type); |
51ef3909 | 5150 | |
a5b1863e | 5151 | /* Figure out the type qualifiers for the declaration. There are |
5152 | two ways a declaration can become qualified. One is something | |
5153 | like `const int i' where the `const' is explicit. Another is | |
5154 | something like `typedef const int CI; CI i' where the type of the | |
0b351ac2 | 5155 | declaration contains the `const'. A third possibility is that |
5156 | there is a type qualifier on the element type of a typedefed | |
5157 | array type, in which case we should extract that qualifier so | |
333adf28 | 5158 | that c_apply_type_quals_to_decl receives the full list of |
0b351ac2 | 5159 | qualifiers to work with (C90 is not entirely clear about whether |
5160 | duplicate qualifiers should be diagnosed in this case, but it | |
5161 | seems most appropriate to do so). */ | |
5162 | element_type = strip_array_types (type); | |
bb476216 | 5163 | constp = declspecs->const_p + TYPE_READONLY (element_type); |
5164 | restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type); | |
5165 | volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type); | |
b560fabd | 5166 | atomicp = declspecs->atomic_p + TYPE_ATOMIC (element_type); |
6d5d708e | 5167 | as1 = declspecs->address_space; |
5168 | as2 = TYPE_ADDR_SPACE (element_type); | |
5169 | address_space = ADDR_SPACE_GENERIC_P (as1)? as2 : as1; | |
5170 | ||
890c2e2f | 5171 | if (constp > 1) |
5172 | pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<const%>"); | |
5173 | if (restrictp > 1) | |
5174 | pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<restrict%>"); | |
5175 | if (volatilep > 1) | |
5176 | pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<volatile%>"); | |
5177 | if (atomicp > 1) | |
5178 | pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<_Atomic%>"); | |
6d5d708e | 5179 | |
5180 | if (!ADDR_SPACE_GENERIC_P (as1) && !ADDR_SPACE_GENERIC_P (as2) && as1 != as2) | |
5181 | error_at (loc, "conflicting named address spaces (%s vs %s)", | |
5182 | c_addr_space_name (as1), c_addr_space_name (as2)); | |
5183 | ||
4c59b58b | 5184 | if ((TREE_CODE (type) == ARRAY_TYPE |
5185 | || first_non_attr_kind == cdk_array) | |
5186 | && TYPE_QUALS (element_type)) | |
51ef3909 | 5187 | type = TYPE_MAIN_VARIANT (type); |
a5b1863e | 5188 | type_quals = ((constp ? TYPE_QUAL_CONST : 0) |
5189 | | (restrictp ? TYPE_QUAL_RESTRICT : 0) | |
6d5d708e | 5190 | | (volatilep ? TYPE_QUAL_VOLATILE : 0) |
b560fabd | 5191 | | (atomicp ? TYPE_QUAL_ATOMIC : 0) |
6d5d708e | 5192 | | ENCODE_QUAL_ADDR_SPACE (address_space)); |
51ef3909 | 5193 | |
b560fabd | 5194 | /* Applying the _Atomic qualifier to an array type (through the use |
5195 | of typedefs or typeof) must be detected here. If the qualifier | |
5196 | is introduced later, any appearance of applying it to an array is | |
5197 | actually applying it to an element of that array. */ | |
5198 | if (atomicp && TREE_CODE (type) == ARRAY_TYPE) | |
5199 | error_at (loc, "%<_Atomic%>-qualified array type"); | |
5200 | ||
feb04535 | 5201 | /* Warn about storage classes that are invalid for certain |
5202 | kinds of declarations (parameters, typenames, etc.). */ | |
5203 | ||
5204 | if (funcdef_flag | |
5205 | && (threadp | |
5206 | || storage_class == csc_auto | |
5207 | || storage_class == csc_register | |
5208 | || storage_class == csc_typedef)) | |
5209 | { | |
8864917d | 5210 | if (storage_class == csc_auto) |
48e1416a | 5211 | pedwarn (loc, |
29438999 | 5212 | (current_scope == file_scope) ? 0 : OPT_Wpedantic, |
8864917d | 5213 | "function definition declared %<auto%>"); |
feb04535 | 5214 | if (storage_class == csc_register) |
e60a6f7b | 5215 | error_at (loc, "function definition declared %<register%>"); |
feb04535 | 5216 | if (storage_class == csc_typedef) |
e60a6f7b | 5217 | error_at (loc, "function definition declared %<typedef%>"); |
feb04535 | 5218 | if (threadp) |
d184e0c0 | 5219 | error_at (loc, "function definition declared %qs", |
5220 | declspecs->thread_gnu_p ? "__thread" : "_Thread_local"); | |
feb04535 | 5221 | threadp = false; |
5222 | if (storage_class == csc_auto | |
5223 | || storage_class == csc_register | |
5224 | || storage_class == csc_typedef) | |
5225 | storage_class = csc_none; | |
5226 | } | |
5227 | else if (decl_context != NORMAL && (storage_class != csc_none || threadp)) | |
5228 | { | |
5229 | if (decl_context == PARM && storage_class == csc_register) | |
5230 | ; | |
5231 | else | |
5232 | { | |
5233 | switch (decl_context) | |
5234 | { | |
5235 | case FIELD: | |
d1dd9ac0 | 5236 | if (name) |
e60a6f7b | 5237 | error_at (loc, "storage class specified for structure " |
5238 | "field %qE", name); | |
d1dd9ac0 | 5239 | else |
e60a6f7b | 5240 | error_at (loc, "storage class specified for structure field"); |
feb04535 | 5241 | break; |
5242 | case PARM: | |
d1dd9ac0 | 5243 | if (name) |
e60a6f7b | 5244 | error_at (loc, "storage class specified for parameter %qE", |
5245 | name); | |
d1dd9ac0 | 5246 | else |
e60a6f7b | 5247 | error_at (loc, "storage class specified for unnamed parameter"); |
feb04535 | 5248 | break; |
5249 | default: | |
e60a6f7b | 5250 | error_at (loc, "storage class specified for typename"); |
feb04535 | 5251 | break; |
5252 | } | |
5253 | storage_class = csc_none; | |
5254 | threadp = false; | |
5255 | } | |
5256 | } | |
5257 | else if (storage_class == csc_extern | |
5258 | && initialized | |
5259 | && !funcdef_flag) | |
5260 | { | |
5261 | /* 'extern' with initialization is invalid if not at file scope. */ | |
9096068a | 5262 | if (current_scope == file_scope) |
5263 | { | |
5264 | /* It is fine to have 'extern const' when compiling at C | |
5265 | and C++ intersection. */ | |
5266 | if (!(warn_cxx_compat && constp)) | |
e60a6f7b | 5267 | warning_at (loc, 0, "%qE initialized and declared %<extern%>", |
5268 | name); | |
9096068a | 5269 | } |
feb04535 | 5270 | else |
e60a6f7b | 5271 | error_at (loc, "%qE has both %<extern%> and initializer", name); |
feb04535 | 5272 | } |
5273 | else if (current_scope == file_scope) | |
5274 | { | |
5275 | if (storage_class == csc_auto) | |
e60a6f7b | 5276 | error_at (loc, "file-scope declaration of %qE specifies %<auto%>", |
5277 | name); | |
feb04535 | 5278 | if (pedantic && storage_class == csc_register) |
29438999 | 5279 | pedwarn (input_location, OPT_Wpedantic, |
d1dd9ac0 | 5280 | "file-scope declaration of %qE specifies %<register%>", name); |
feb04535 | 5281 | } |
5282 | else | |
5283 | { | |
5284 | if (storage_class == csc_extern && funcdef_flag) | |
e60a6f7b | 5285 | error_at (loc, "nested function %qE declared %<extern%>", name); |
feb04535 | 5286 | else if (threadp && storage_class == csc_none) |
5287 | { | |
e60a6f7b | 5288 | error_at (loc, "function-scope %qE implicitly auto and declared " |
d184e0c0 | 5289 | "%qs", name, |
5290 | declspecs->thread_gnu_p ? "__thread" : "_Thread_local"); | |
feb04535 | 5291 | threadp = false; |
5292 | } | |
5293 | } | |
51ef3909 | 5294 | |
5295 | /* Now figure out the structure of the declarator proper. | |
5296 | Descend through it, creating more complex types, until we reach | |
aebc8537 | 5297 | the declared identifier (or NULL_TREE, in an absolute declarator). |
5298 | At each stage we maintain an unqualified version of the type | |
5299 | together with any qualifiers that should be applied to it with | |
5300 | c_build_qualified_type; this way, array types including | |
5301 | multidimensional array types are first built up in unqualified | |
5302 | form and then the qualified form is created with | |
5303 | TYPE_MAIN_VARIANT pointing to the unqualified form. */ | |
51ef3909 | 5304 | |
ac206aff | 5305 | while (declarator && declarator->kind != cdk_id) |
51ef3909 | 5306 | { |
5307 | if (type == error_mark_node) | |
5308 | { | |
ac206aff | 5309 | declarator = declarator->declarator; |
51ef3909 | 5310 | continue; |
5311 | } | |
5312 | ||
ac206aff | 5313 | /* Each level of DECLARATOR is either a cdk_array (for ...[..]), |
5314 | a cdk_pointer (for *...), | |
5315 | a cdk_function (for ...(...)), | |
5316 | a cdk_attrs (for nested attributes), | |
5317 | or a cdk_id (for the name being declared | |
5318 | or the place in an absolute declarator | |
51ef3909 | 5319 | where the name was omitted). |
ac206aff | 5320 | For the last case, we have just exited the loop. |
51ef3909 | 5321 | |
5322 | At this point, TYPE is the type of elements of an array, | |
5323 | or for a function to return, or for a pointer to point to. | |
5324 | After this sequence of ifs, TYPE is the type of the | |
5325 | array or function or pointer, and DECLARATOR has had its | |
5326 | outermost layer removed. */ | |
5327 | ||
bb476216 | 5328 | if (array_ptr_quals != TYPE_UNQUALIFIED |
5329 | || array_ptr_attrs != NULL_TREE | |
5330 | || array_parm_static) | |
1fd94215 | 5331 | { |
5332 | /* Only the innermost declarator (making a parameter be of | |
5333 | array type which is converted to pointer type) | |
5334 | may have static or type qualifiers. */ | |
e60a6f7b | 5335 | error_at (loc, "static or type qualifiers in non-parameter array declarator"); |
bb476216 | 5336 | array_ptr_quals = TYPE_UNQUALIFIED; |
5337 | array_ptr_attrs = NULL_TREE; | |
1fd94215 | 5338 | array_parm_static = 0; |
5339 | } | |
5340 | ||
ac206aff | 5341 | switch (declarator->kind) |
51ef3909 | 5342 | { |
ac206aff | 5343 | case cdk_attrs: |
231bd014 | 5344 | { |
ac206aff | 5345 | /* A declarator with embedded attributes. */ |
5346 | tree attrs = declarator->u.attrs; | |
5347 | const struct c_declarator *inner_decl; | |
231bd014 | 5348 | int attr_flags = 0; |
ac206aff | 5349 | declarator = declarator->declarator; |
231bd014 | 5350 | inner_decl = declarator; |
ac206aff | 5351 | while (inner_decl->kind == cdk_attrs) |
5352 | inner_decl = inner_decl->declarator; | |
5353 | if (inner_decl->kind == cdk_id) | |
231bd014 | 5354 | attr_flags |= (int) ATTR_FLAG_DECL_NEXT; |
ac206aff | 5355 | else if (inner_decl->kind == cdk_function) |
231bd014 | 5356 | attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT; |
ac206aff | 5357 | else if (inner_decl->kind == cdk_array) |
231bd014 | 5358 | attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT; |
5359 | returned_attrs = decl_attributes (&type, | |
5360 | chainon (returned_attrs, attrs), | |
5361 | attr_flags); | |
5362 | break; | |
5363 | } | |
ac206aff | 5364 | case cdk_array: |
231bd014 | 5365 | { |
5366 | tree itype = NULL_TREE; | |
ac206aff | 5367 | tree size = declarator->u.array.dimen; |
231bd014 | 5368 | /* The index is a signed object `sizetype' bits wide. */ |
5369 | tree index_type = c_common_signed_type (sizetype); | |
5370 | ||
ac206aff | 5371 | array_ptr_quals = declarator->u.array.quals; |
bb476216 | 5372 | array_ptr_attrs = declarator->u.array.attrs; |
ac206aff | 5373 | array_parm_static = declarator->u.array.static_p; |
32d33ab2 | 5374 | array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p; |
5375 | ||
ac206aff | 5376 | declarator = declarator->declarator; |
231bd014 | 5377 | |
5378 | /* Check for some types that there cannot be arrays of. */ | |
a0c938f0 | 5379 | |
231bd014 | 5380 | if (VOID_TYPE_P (type)) |
5381 | { | |
d1dd9ac0 | 5382 | if (name) |
e60a6f7b | 5383 | error_at (loc, "declaration of %qE as array of voids", name); |
d1dd9ac0 | 5384 | else |
e60a6f7b | 5385 | error_at (loc, "declaration of type name as array of voids"); |
231bd014 | 5386 | type = error_mark_node; |
5387 | } | |
a0c938f0 | 5388 | |
231bd014 | 5389 | if (TREE_CODE (type) == FUNCTION_TYPE) |
5390 | { | |
d1dd9ac0 | 5391 | if (name) |
e60a6f7b | 5392 | error_at (loc, "declaration of %qE as array of functions", |
5393 | name); | |
d1dd9ac0 | 5394 | else |
e60a6f7b | 5395 | error_at (loc, "declaration of type name as array of " |
5396 | "functions"); | |
231bd014 | 5397 | type = error_mark_node; |
5398 | } | |
a0c938f0 | 5399 | |
3df42822 | 5400 | if (pedantic && !in_system_header_at (input_location) |
5401 | && flexible_array_type_p (type)) | |
29438999 | 5402 | pedwarn (loc, OPT_Wpedantic, |
21ca8540 | 5403 | "invalid use of structure with flexible array member"); |
a0c938f0 | 5404 | |
231bd014 | 5405 | if (size == error_mark_node) |
51ef3909 | 5406 | type = error_mark_node; |
a0c938f0 | 5407 | |
231bd014 | 5408 | if (type == error_mark_node) |
5409 | continue; | |
0dbd1c74 | 5410 | |
231bd014 | 5411 | /* If size was specified, set ITYPE to a range-type for |
5412 | that size. Otherwise, ITYPE remains null. finish_decl | |
5413 | may figure it out from an initial value. */ | |
1b82e858 | 5414 | |
231bd014 | 5415 | if (size) |
5416 | { | |
a75b1c71 | 5417 | bool size_maybe_const = true; |
5418 | bool size_int_const = (TREE_CODE (size) == INTEGER_CST | |
5419 | && !TREE_OVERFLOW (size)); | |
5420 | bool this_size_varies = false; | |
5421 | ||
231bd014 | 5422 | /* Strip NON_LVALUE_EXPRs since we aren't using as an |
5423 | lvalue. */ | |
5424 | STRIP_TYPE_NOPS (size); | |
a0c938f0 | 5425 | |
84166705 | 5426 | if (!INTEGRAL_TYPE_P (TREE_TYPE (size))) |
231bd014 | 5427 | { |
d1dd9ac0 | 5428 | if (name) |
e60a6f7b | 5429 | error_at (loc, "size of array %qE has non-integer type", |
5430 | name); | |
d1dd9ac0 | 5431 | else |
e60a6f7b | 5432 | error_at (loc, |
5433 | "size of unnamed array has non-integer type"); | |
231bd014 | 5434 | size = integer_one_node; |
5435 | } | |
a0c938f0 | 5436 | |
a75b1c71 | 5437 | size = c_fully_fold (size, false, &size_maybe_const); |
5438 | ||
5439 | if (pedantic && size_maybe_const && integer_zerop (size)) | |
d1dd9ac0 | 5440 | { |
5441 | if (name) | |
29438999 | 5442 | pedwarn (loc, OPT_Wpedantic, |
d1dd9ac0 | 5443 | "ISO C forbids zero-size array %qE", name); |
5444 | else | |
29438999 | 5445 | pedwarn (loc, OPT_Wpedantic, |
d1dd9ac0 | 5446 | "ISO C forbids zero-size array"); |
5447 | } | |
a0c938f0 | 5448 | |
a75b1c71 | 5449 | if (TREE_CODE (size) == INTEGER_CST && size_maybe_const) |
231bd014 | 5450 | { |
5451 | constant_expression_warning (size); | |
5452 | if (tree_int_cst_sgn (size) < 0) | |
5453 | { | |
d1dd9ac0 | 5454 | if (name) |
e60a6f7b | 5455 | error_at (loc, "size of array %qE is negative", name); |
d1dd9ac0 | 5456 | else |
e60a6f7b | 5457 | error_at (loc, "size of unnamed array is negative"); |
231bd014 | 5458 | size = integer_one_node; |
5459 | } | |
a75b1c71 | 5460 | /* Handle a size folded to an integer constant but |
5461 | not an integer constant expression. */ | |
5462 | if (!size_int_const) | |
5463 | { | |
ce4e9a43 | 5464 | /* If this is a file scope declaration of an |
5465 | ordinary identifier, this is invalid code; | |
5466 | diagnosing it here and not subsequently | |
5467 | treating the type as variable-length avoids | |
5468 | more confusing diagnostics later. */ | |
5469 | if ((decl_context == NORMAL || decl_context == FIELD) | |
5470 | && current_scope == file_scope) | |
5471 | pedwarn (input_location, 0, | |
d1dd9ac0 | 5472 | "variably modified %qE at file scope", |
5473 | name); | |
ce4e9a43 | 5474 | else |
b99f3c92 | 5475 | this_size_varies = size_varies = true; |
d1dd9ac0 | 5476 | warn_variable_length_array (name, size); |
a75b1c71 | 5477 | } |
231bd014 | 5478 | } |
dc95eae2 | 5479 | else if ((decl_context == NORMAL || decl_context == FIELD) |
5480 | && current_scope == file_scope) | |
5481 | { | |
e60a6f7b | 5482 | error_at (loc, "variably modified %qE at file scope", name); |
dc95eae2 | 5483 | size = integer_one_node; |
5484 | } | |
231bd014 | 5485 | else |
5486 | { | |
5487 | /* Make sure the array size remains visibly | |
5488 | nonconstant even if it is (eg) a const variable | |
5489 | with known value. */ | |
b99f3c92 | 5490 | this_size_varies = size_varies = true; |
d1dd9ac0 | 5491 | warn_variable_length_array (name, size); |
2c4c3477 | 5492 | if (flag_sanitize & SANITIZE_VLA |
70575064 | 5493 | && decl_context == NORMAL |
5494 | && current_function_decl != NULL_TREE | |
5495 | && !lookup_attribute ("no_sanitize_undefined", | |
5496 | DECL_ATTRIBUTES | |
5497 | (current_function_decl))) | |
2c4c3477 | 5498 | { |
5499 | /* Evaluate the array size only once. */ | |
5500 | size = c_save_expr (size); | |
5501 | size = c_fully_fold (size, false, NULL); | |
5502 | size = fold_build2 (COMPOUND_EXPR, TREE_TYPE (size), | |
5503 | ubsan_instrument_vla (loc, size), | |
5504 | size); | |
5505 | } | |
231bd014 | 5506 | } |
51ef3909 | 5507 | |
a75b1c71 | 5508 | if (integer_zerop (size) && !this_size_varies) |
231bd014 | 5509 | { |
a0c938f0 | 5510 | /* A zero-length array cannot be represented with |
5511 | an unsigned index type, which is what we'll | |
5512 | get with build_index_type. Create an | |
5513 | open-ended range instead. */ | |
231bd014 | 5514 | itype = build_range_type (sizetype, size, NULL_TREE); |
5515 | } | |
5516 | else | |
5517 | { | |
4bf51001 | 5518 | /* Arrange for the SAVE_EXPR on the inside of the |
5519 | MINUS_EXPR, which allows the -1 to get folded | |
5520 | with the +1 that happens when building TYPE_SIZE. */ | |
5521 | if (size_varies) | |
4232a958 | 5522 | size = save_expr (size); |
a75b1c71 | 5523 | if (this_size_varies && TREE_CODE (size) == INTEGER_CST) |
5524 | size = build2 (COMPOUND_EXPR, TREE_TYPE (size), | |
5525 | integer_zero_node, size); | |
4bf51001 | 5526 | |
231bd014 | 5527 | /* Compute the maximum valid index, that is, size |
5528 | - 1. Do the calculation in index_type, so that | |
5529 | if it is a variable the computations will be | |
5530 | done in the proper mode. */ | |
389dd41b | 5531 | itype = fold_build2_loc (loc, MINUS_EXPR, index_type, |
5532 | convert (index_type, size), | |
5533 | convert (index_type, | |
5534 | size_one_node)); | |
231bd014 | 5535 | |
8f49133b | 5536 | /* The above overflows when size does not fit |
5537 | in index_type. | |
5538 | ??? While a size of INT_MAX+1 technically shouldn't | |
5539 | cause an overflow (because we subtract 1), handling | |
5540 | this case seems like an unnecessary complication. */ | |
5541 | if (TREE_CODE (size) == INTEGER_CST | |
5542 | && !int_fits_type_p (size, index_type)) | |
231bd014 | 5543 | { |
d1dd9ac0 | 5544 | if (name) |
e60a6f7b | 5545 | error_at (loc, "size of array %qE is too large", |
5546 | name); | |
d1dd9ac0 | 5547 | else |
e60a6f7b | 5548 | error_at (loc, "size of unnamed array is too large"); |
231bd014 | 5549 | type = error_mark_node; |
5550 | continue; | |
5551 | } | |
a0c938f0 | 5552 | |
231bd014 | 5553 | itype = build_index_type (itype); |
5554 | } | |
a75b1c71 | 5555 | if (this_size_varies) |
5556 | { | |
5557 | if (*expr) | |
5558 | *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size), | |
5559 | *expr, size); | |
5560 | else | |
5561 | *expr = size; | |
5562 | *expr_const_operands &= size_maybe_const; | |
5563 | } | |
231bd014 | 5564 | } |
5565 | else if (decl_context == FIELD) | |
5566 | { | |
0af147a4 | 5567 | bool flexible_array_member = false; |
51428eb1 | 5568 | if (array_parm_vla_unspec_p) |
5569 | /* Field names can in fact have function prototype | |
5570 | scope so [*] is disallowed here through making | |
5571 | the field variably modified, not through being | |
5572 | something other than a declaration with function | |
5573 | prototype scope. */ | |
b99f3c92 | 5574 | size_varies = true; |
0af147a4 | 5575 | else |
5576 | { | |
5577 | const struct c_declarator *t = declarator; | |
5578 | while (t->kind == cdk_attrs) | |
5579 | t = t->declarator; | |
5580 | flexible_array_member = (t->kind == cdk_id); | |
5581 | } | |
5582 | if (flexible_array_member | |
3df42822 | 5583 | && !in_system_header_at (input_location)) |
890c2e2f | 5584 | pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not " |
5585 | "support flexible array members"); | |
fca37017 | 5586 | |
231bd014 | 5587 | /* ISO C99 Flexible array members are effectively |
5588 | identical to GCC's zero-length array extension. */ | |
0af147a4 | 5589 | if (flexible_array_member || array_parm_vla_unspec_p) |
5590 | itype = build_range_type (sizetype, size_zero_node, | |
5591 | NULL_TREE); | |
231bd014 | 5592 | } |
32d33ab2 | 5593 | else if (decl_context == PARM) |
5594 | { | |
5595 | if (array_parm_vla_unspec_p) | |
5596 | { | |
32d33ab2 | 5597 | itype = build_range_type (sizetype, size_zero_node, NULL_TREE); |
b99f3c92 | 5598 | size_varies = true; |
32d33ab2 | 5599 | } |
5600 | } | |
ce675af0 | 5601 | else if (decl_context == TYPENAME) |
5602 | { | |
5603 | if (array_parm_vla_unspec_p) | |
5604 | { | |
51428eb1 | 5605 | /* C99 6.7.5.2p4 */ |
5606 | warning (0, "%<[*]%> not in a declaration"); | |
5607 | /* We use this to avoid messing up with incomplete | |
5608 | array types of the same type, that would | |
5609 | otherwise be modified below. */ | |
ce675af0 | 5610 | itype = build_range_type (sizetype, size_zero_node, |
5611 | NULL_TREE); | |
b99f3c92 | 5612 | size_varies = true; |
ce675af0 | 5613 | } |
5614 | } | |
51ef3909 | 5615 | |
5568b3c6 | 5616 | /* Complain about arrays of incomplete types. */ |
b765c734 | 5617 | if (!COMPLETE_TYPE_P (type)) |
5618 | { | |
e60a6f7b | 5619 | error_at (loc, "array type has incomplete element type"); |
a0c938f0 | 5620 | type = error_mark_node; |
b765c734 | 5621 | } |
5622 | else | |
ce675af0 | 5623 | /* When itype is NULL, a shared incomplete array type is |
5624 | returned for all array of a given type. Elsewhere we | |
5625 | make sure we don't complete that type before copying | |
5626 | it, but here we want to make sure we don't ever | |
5627 | modify the shared type, so we gcc_assert (itype) | |
5628 | below. */ | |
6d5d708e | 5629 | { |
5630 | addr_space_t as = DECODE_QUAL_ADDR_SPACE (type_quals); | |
5631 | if (!ADDR_SPACE_GENERIC_P (as) && as != TYPE_ADDR_SPACE (type)) | |
5632 | type = build_qualified_type (type, | |
5633 | ENCODE_QUAL_ADDR_SPACE (as)); | |
5634 | ||
5635 | type = build_array_type (type, itype); | |
5636 | } | |
51ef3909 | 5637 | |
4dc955c8 | 5638 | if (type != error_mark_node) |
231bd014 | 5639 | { |
4dc955c8 | 5640 | if (size_varies) |
dc95eae2 | 5641 | { |
ce675af0 | 5642 | /* It is ok to modify type here even if itype is |
5643 | NULL: if size_varies, we're in a | |
a8b99ef6 | 5644 | multi-dimensional array and the inner type has |
ce675af0 | 5645 | variable size, so the enclosing shared array type |
5646 | must too. */ | |
dc95eae2 | 5647 | if (size && TREE_CODE (size) == INTEGER_CST) |
5648 | type | |
5649 | = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); | |
5650 | C_TYPE_VARIABLE_SIZE (type) = 1; | |
5651 | } | |
4dc955c8 | 5652 | |
5653 | /* The GCC extension for zero-length arrays differs from | |
5654 | ISO flexible array members in that sizeof yields | |
5655 | zero. */ | |
5656 | if (size && integer_zerop (size)) | |
5657 | { | |
ce675af0 | 5658 | gcc_assert (itype); |
b78aa367 | 5659 | type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); |
4dc955c8 | 5660 | TYPE_SIZE (type) = bitsize_zero_node; |
5661 | TYPE_SIZE_UNIT (type) = size_zero_node; | |
f54ef8b6 | 5662 | SET_TYPE_STRUCTURAL_EQUALITY (type); |
4dc955c8 | 5663 | } |
32d33ab2 | 5664 | if (array_parm_vla_unspec_p) |
5665 | { | |
ce675af0 | 5666 | gcc_assert (itype); |
32d33ab2 | 5667 | /* The type is complete. C99 6.7.5.2p4 */ |
b78aa367 | 5668 | type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); |
32d33ab2 | 5669 | TYPE_SIZE (type) = bitsize_zero_node; |
5670 | TYPE_SIZE_UNIT (type) = size_zero_node; | |
f54ef8b6 | 5671 | SET_TYPE_STRUCTURAL_EQUALITY (type); |
32d33ab2 | 5672 | } |
231bd014 | 5673 | } |
51ef3909 | 5674 | |
231bd014 | 5675 | if (decl_context != PARM |
bb476216 | 5676 | && (array_ptr_quals != TYPE_UNQUALIFIED |
5677 | || array_ptr_attrs != NULL_TREE | |
5678 | || array_parm_static)) | |
231bd014 | 5679 | { |
e60a6f7b | 5680 | error_at (loc, "static or type qualifiers in non-parameter array declarator"); |
bb476216 | 5681 | array_ptr_quals = TYPE_UNQUALIFIED; |
5682 | array_ptr_attrs = NULL_TREE; | |
231bd014 | 5683 | array_parm_static = 0; |
5684 | } | |
5685 | break; | |
5686 | } | |
ac206aff | 5687 | case cdk_function: |
231bd014 | 5688 | { |
5689 | /* Say it's a definition only for the declarator closest | |
5690 | to the identifier, apart possibly from some | |
5691 | attributes. */ | |
5692 | bool really_funcdef = false; | |
5693 | tree arg_types; | |
5694 | if (funcdef_flag) | |
5695 | { | |
ac206aff | 5696 | const struct c_declarator *t = declarator->declarator; |
5697 | while (t->kind == cdk_attrs) | |
5698 | t = t->declarator; | |
5699 | really_funcdef = (t->kind == cdk_id); | |
231bd014 | 5700 | } |
51ef3909 | 5701 | |
231bd014 | 5702 | /* Declaring a function type. Make sure we have a valid |
5703 | type for the function to return. */ | |
5704 | if (type == error_mark_node) | |
5705 | continue; | |
a0c938f0 | 5706 | |
b99f3c92 | 5707 | size_varies = false; |
51ef3909 | 5708 | |
231bd014 | 5709 | /* Warn about some types functions can't return. */ |
5710 | if (TREE_CODE (type) == FUNCTION_TYPE) | |
5711 | { | |
d1dd9ac0 | 5712 | if (name) |
e60a6f7b | 5713 | error_at (loc, "%qE declared as function returning a " |
5714 | "function", name); | |
d1dd9ac0 | 5715 | else |
e60a6f7b | 5716 | error_at (loc, "type name declared as function " |
5717 | "returning a function"); | |
231bd014 | 5718 | type = integer_type_node; |
5719 | } | |
5720 | if (TREE_CODE (type) == ARRAY_TYPE) | |
5721 | { | |
d1dd9ac0 | 5722 | if (name) |
e60a6f7b | 5723 | error_at (loc, "%qE declared as function returning an array", |
5724 | name); | |
d1dd9ac0 | 5725 | else |
e60a6f7b | 5726 | error_at (loc, "type name declared as function returning " |
5727 | "an array"); | |
231bd014 | 5728 | type = integer_type_node; |
5729 | } | |
2b3c93a3 | 5730 | errmsg = targetm.invalid_return_type (type); |
5731 | if (errmsg) | |
5732 | { | |
5733 | error (errmsg); | |
5734 | type = integer_type_node; | |
5735 | } | |
51ef3909 | 5736 | |
231bd014 | 5737 | /* Construct the function type and go to the next |
5738 | inner layer of declarator. */ | |
ac206aff | 5739 | arg_info = declarator->u.arg_info; |
231bd014 | 5740 | arg_types = grokparms (arg_info, really_funcdef); |
51ef3909 | 5741 | |
231bd014 | 5742 | /* Type qualifiers before the return type of the function |
5743 | qualify the return type, not the function type. */ | |
5744 | if (type_quals) | |
5745 | { | |
a0c938f0 | 5746 | /* Type qualifiers on a function return type are |
231bd014 | 5747 | normally permitted by the standard but have no |
5748 | effect, so give a warning at -Wreturn-type. | |
5749 | Qualifiers on a void return type are banned on | |
5750 | function definitions in ISO C; GCC used to used | |
5751 | them for noreturn functions. */ | |
5752 | if (VOID_TYPE_P (type) && really_funcdef) | |
e60a6f7b | 5753 | pedwarn (loc, 0, |
21ca8540 | 5754 | "function definition has qualified void return type"); |
8b6866af | 5755 | else |
e60a6f7b | 5756 | warning_at (loc, OPT_Wignored_qualifiers, |
8b6866af | 5757 | "type qualifiers ignored on function return type"); |
a0c938f0 | 5758 | |
231bd014 | 5759 | type = c_build_qualified_type (type, type_quals); |
5760 | } | |
5761 | type_quals = TYPE_UNQUALIFIED; | |
a0c938f0 | 5762 | |
231bd014 | 5763 | type = build_function_type (type, arg_types); |
ac206aff | 5764 | declarator = declarator->declarator; |
a0c938f0 | 5765 | |
231bd014 | 5766 | /* Set the TYPE_CONTEXTs for each tagged type which is local to |
5767 | the formal parameter list of this FUNCTION_TYPE to point to | |
5768 | the FUNCTION_TYPE node itself. */ | |
613f2a35 | 5769 | { |
9d61f04b | 5770 | c_arg_tag *tag; |
5771 | unsigned ix; | |
a0c938f0 | 5772 | |
f1f41a6c | 5773 | FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag) |
9d61f04b | 5774 | TYPE_CONTEXT (tag->type) = type; |
613f2a35 | 5775 | } |
231bd014 | 5776 | break; |
5777 | } | |
ac206aff | 5778 | case cdk_pointer: |
51ef3909 | 5779 | { |
231bd014 | 5780 | /* Merge any constancy or volatility into the target type |
5781 | for the pointer. */ | |
b560fabd | 5782 | if ((type_quals & TYPE_QUAL_ATOMIC) |
5783 | && TREE_CODE (type) == FUNCTION_TYPE) | |
5784 | { | |
5785 | error_at (loc, | |
5786 | "%<_Atomic%>-qualified function type"); | |
5787 | type_quals &= ~TYPE_QUAL_ATOMIC; | |
5788 | } | |
5789 | else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE | |
5790 | && type_quals) | |
29438999 | 5791 | pedwarn (loc, OPT_Wpedantic, |
21ca8540 | 5792 | "ISO C forbids qualified function types"); |
231bd014 | 5793 | if (type_quals) |
5794 | type = c_build_qualified_type (type, type_quals); | |
b99f3c92 | 5795 | size_varies = false; |
bb476216 | 5796 | |
6e8435a1 | 5797 | /* When the pointed-to type involves components of variable size, |
5798 | care must be taken to ensure that the size evaluation code is | |
5799 | emitted early enough to dominate all the possible later uses | |
5800 | and late enough for the variables on which it depends to have | |
5801 | been assigned. | |
5802 | ||
5803 | This is expected to happen automatically when the pointed-to | |
5804 | type has a name/declaration of it's own, but special attention | |
5805 | is required if the type is anonymous. | |
5806 | ||
5807 | We handle the NORMAL and FIELD contexts here by attaching an | |
5808 | artificial TYPE_DECL to such pointed-to type. This forces the | |
5809 | sizes evaluation at a safe point and ensures it is not deferred | |
5810 | until e.g. within a deeper conditional context. | |
5811 | ||
5812 | We expect nothing to be needed here for PARM or TYPENAME. | |
5813 | Pushing a TYPE_DECL at this point for TYPENAME would actually | |
5814 | be incorrect, as we might be in the middle of an expression | |
5815 | with side effects on the pointed-to type size "arguments" prior | |
5816 | to the pointer declaration point and the fake TYPE_DECL in the | |
5817 | enclosing context would force the size evaluation prior to the | |
5818 | side effects. */ | |
5819 | ||
5820 | if (!TYPE_NAME (type) | |
5821 | && (decl_context == NORMAL || decl_context == FIELD) | |
5822 | && variably_modified_type_p (type, NULL_TREE)) | |
5823 | { | |
e60a6f7b | 5824 | tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type); |
6e8435a1 | 5825 | DECL_ARTIFICIAL (decl) = 1; |
5826 | pushdecl (decl); | |
e60a6f7b | 5827 | finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE); |
6e8435a1 | 5828 | TYPE_NAME (type) = decl; |
5829 | } | |
5830 | ||
7714837c | 5831 | type = c_build_pointer_type (type); |
a0c938f0 | 5832 | |
9553111d | 5833 | /* Process type qualifiers (such as const or volatile) |
5834 | that were given inside the `*'. */ | |
bb476216 | 5835 | type_quals = declarator->u.pointer_quals; |
9553111d | 5836 | |
ac206aff | 5837 | declarator = declarator->declarator; |
231bd014 | 5838 | break; |
51ef3909 | 5839 | } |
231bd014 | 5840 | default: |
5841 | gcc_unreachable (); | |
51ef3909 | 5842 | } |
51ef3909 | 5843 | } |
e47ffaae | 5844 | *decl_attrs = chainon (returned_attrs, *decl_attrs); |
51ef3909 | 5845 | |
aebc8537 | 5846 | /* Now TYPE has the actual type, apart from any qualifiers in |
5847 | TYPE_QUALS. */ | |
51ef3909 | 5848 | |
6d5d708e | 5849 | /* Warn about address space used for things other than static memory or |
5850 | pointers. */ | |
5851 | address_space = DECODE_QUAL_ADDR_SPACE (type_quals); | |
5852 | if (!ADDR_SPACE_GENERIC_P (address_space)) | |
5853 | { | |
5854 | if (decl_context == NORMAL) | |
5855 | { | |
5856 | switch (storage_class) | |
5857 | { | |
5858 | case csc_auto: | |
5859 | error ("%qs combined with %<auto%> qualifier for %qE", | |
5860 | c_addr_space_name (address_space), name); | |
5861 | break; | |
5862 | case csc_register: | |
5863 | error ("%qs combined with %<register%> qualifier for %qE", | |
5864 | c_addr_space_name (address_space), name); | |
5865 | break; | |
5866 | case csc_none: | |
5867 | if (current_function_scope) | |
5868 | { | |
5869 | error ("%qs specified for auto variable %qE", | |
5870 | c_addr_space_name (address_space), name); | |
5871 | break; | |
5872 | } | |
5873 | break; | |
5874 | case csc_static: | |
5875 | case csc_extern: | |
5876 | case csc_typedef: | |
5877 | break; | |
5878 | default: | |
5879 | gcc_unreachable (); | |
5880 | } | |
5881 | } | |
5882 | else if (decl_context == PARM && TREE_CODE (type) != ARRAY_TYPE) | |
5883 | { | |
5884 | if (name) | |
5885 | error ("%qs specified for parameter %qE", | |
5886 | c_addr_space_name (address_space), name); | |
5887 | else | |
5888 | error ("%qs specified for unnamed parameter", | |
5889 | c_addr_space_name (address_space)); | |
5890 | } | |
5891 | else if (decl_context == FIELD) | |
5892 | { | |
5893 | if (name) | |
5894 | error ("%qs specified for structure field %qE", | |
5895 | c_addr_space_name (address_space), name); | |
5896 | else | |
5897 | error ("%qs specified for structure field", | |
5898 | c_addr_space_name (address_space)); | |
5899 | } | |
5900 | } | |
5901 | ||
8b54bce6 | 5902 | /* Check the type and width of a bit-field. */ |
5903 | if (bitfield) | |
b560fabd | 5904 | { |
5905 | check_bitfield_type_and_width (&type, width, name); | |
5906 | /* C11 makes it implementation-defined (6.7.2.1#5) whether | |
5907 | atomic types are permitted for bit-fields; we have no code to | |
5908 | make bit-field accesses atomic, so disallow them. */ | |
5909 | if (type_quals & TYPE_QUAL_ATOMIC) | |
5910 | { | |
5911 | if (name) | |
5912 | error ("bit-field %qE has atomic type", name); | |
5913 | else | |
5914 | error ("bit-field has atomic type"); | |
5915 | type_quals &= ~TYPE_QUAL_ATOMIC; | |
5916 | } | |
5917 | } | |
8b54bce6 | 5918 | |
83e25171 | 5919 | /* Reject invalid uses of _Alignas. */ |
5920 | if (declspecs->alignas_p) | |
5921 | { | |
5922 | if (storage_class == csc_typedef) | |
5923 | error_at (loc, "alignment specified for typedef %qE", name); | |
5924 | else if (storage_class == csc_register) | |
5925 | error_at (loc, "alignment specified for %<register%> object %qE", | |
5926 | name); | |
5927 | else if (decl_context == PARM) | |
5928 | { | |
5929 | if (name) | |
5930 | error_at (loc, "alignment specified for parameter %qE", name); | |
5931 | else | |
5932 | error_at (loc, "alignment specified for unnamed parameter"); | |
5933 | } | |
5934 | else if (bitfield) | |
5935 | { | |
5936 | if (name) | |
5937 | error_at (loc, "alignment specified for bit-field %qE", name); | |
5938 | else | |
5939 | error_at (loc, "alignment specified for unnamed bit-field"); | |
5940 | } | |
5941 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
5942 | error_at (loc, "alignment specified for function %qE", name); | |
5943 | else if (declspecs->align_log != -1) | |
5944 | { | |
5945 | alignas_align = 1U << declspecs->align_log; | |
c2c4ae8d | 5946 | if (alignas_align < min_align_of_type (type)) |
83e25171 | 5947 | { |
5948 | if (name) | |
5949 | error_at (loc, "%<_Alignas%> specifiers cannot reduce " | |
5950 | "alignment of %qE", name); | |
5951 | else | |
5952 | error_at (loc, "%<_Alignas%> specifiers cannot reduce " | |
5953 | "alignment of unnamed field"); | |
5954 | alignas_align = 0; | |
5955 | } | |
5956 | } | |
5957 | } | |
5958 | ||
85d86b55 | 5959 | /* Did array size calculations overflow or does the array cover more |
5960 | than half of the address-space? */ | |
0dbd1c74 | 5961 | if (TREE_CODE (type) == ARRAY_TYPE |
4b72716d | 5962 | && COMPLETE_TYPE_P (type) |
c96dc3af | 5963 | && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST |
85d86b55 | 5964 | && ! valid_constant_size_p (TYPE_SIZE_UNIT (type))) |
a37bbfd1 | 5965 | { |
d1dd9ac0 | 5966 | if (name) |
e60a6f7b | 5967 | error_at (loc, "size of array %qE is too large", name); |
d1dd9ac0 | 5968 | else |
e60a6f7b | 5969 | error_at (loc, "size of unnamed array is too large"); |
734c98be | 5970 | /* If we proceed with the array type as it is, we'll eventually |
08f817b3 | 5971 | crash in tree_to_[su]hwi(). */ |
a37bbfd1 | 5972 | type = error_mark_node; |
5973 | } | |
0dbd1c74 | 5974 | |
51ef3909 | 5975 | /* If this is declaring a typedef name, return a TYPE_DECL. */ |
5976 | ||
feb04535 | 5977 | if (storage_class == csc_typedef) |
51ef3909 | 5978 | { |
5979 | tree decl; | |
b560fabd | 5980 | if ((type_quals & TYPE_QUAL_ATOMIC) |
5981 | && TREE_CODE (type) == FUNCTION_TYPE) | |
5982 | { | |
5983 | error_at (loc, | |
5984 | "%<_Atomic%>-qualified function type"); | |
5985 | type_quals &= ~TYPE_QUAL_ATOMIC; | |
5986 | } | |
5987 | else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE | |
5988 | && type_quals) | |
29438999 | 5989 | pedwarn (loc, OPT_Wpedantic, |
21ca8540 | 5990 | "ISO C forbids qualified function types"); |
a5b1863e | 5991 | if (type_quals) |
5992 | type = c_build_qualified_type (type, type_quals); | |
e60a6f7b | 5993 | decl = build_decl (declarator->id_loc, |
5994 | TYPE_DECL, declarator->u.id, type); | |
70dd11f7 | 5995 | if (declspecs->explicit_signed_p) |
51ef3909 | 5996 | C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1; |
ebdbd341 | 5997 | if (declspecs->inline_p) |
e60a6f7b | 5998 | pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl); |
985c6e3a | 5999 | if (declspecs->noreturn_p) |
6000 | pedwarn (loc, 0,"typedef %q+D declared %<_Noreturn%>", decl); | |
26dbec0a | 6001 | |
6002 | if (warn_cxx_compat && declarator->u.id != NULL_TREE) | |
6003 | { | |
6004 | struct c_binding *b = I_TAG_BINDING (declarator->u.id); | |
6005 | ||
6006 | if (b != NULL | |
6007 | && b->decl != NULL_TREE | |
6008 | && (B_IN_CURRENT_SCOPE (b) | |
6009 | || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b))) | |
6010 | && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type)) | |
6011 | { | |
6012 | warning_at (declarator->id_loc, OPT_Wc___compat, | |
6013 | ("using %qD as both a typedef and a tag is " | |
6014 | "invalid in C++"), | |
6015 | decl); | |
6016 | if (b->locus != UNKNOWN_LOCATION) | |
6017 | inform (b->locus, "originally defined here"); | |
6018 | } | |
6019 | } | |
6020 | ||
51ef3909 | 6021 | return decl; |
6022 | } | |
6023 | ||
51ef3909 | 6024 | /* If this is a type name (such as, in a cast or sizeof), |
6025 | compute the type and return it now. */ | |
6026 | ||
6027 | if (decl_context == TYPENAME) | |
6028 | { | |
ebdbd341 | 6029 | /* Note that the grammar rejects storage classes in typenames |
6030 | and fields. */ | |
6031 | gcc_assert (storage_class == csc_none && !threadp | |
985c6e3a | 6032 | && !declspecs->inline_p && !declspecs->noreturn_p); |
b560fabd | 6033 | if ((type_quals & TYPE_QUAL_ATOMIC) |
6034 | && TREE_CODE (type) == FUNCTION_TYPE) | |
6035 | { | |
6036 | error_at (loc, | |
6037 | "%<_Atomic%>-qualified function type"); | |
6038 | type_quals &= ~TYPE_QUAL_ATOMIC; | |
6039 | } | |
6040 | else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE | |
6041 | && type_quals) | |
29438999 | 6042 | pedwarn (loc, OPT_Wpedantic, |
21ca8540 | 6043 | "ISO C forbids const or volatile function types"); |
a5b1863e | 6044 | if (type_quals) |
6045 | type = c_build_qualified_type (type, type_quals); | |
51ef3909 | 6046 | return type; |
6047 | } | |
6048 | ||
32d33ab2 | 6049 | if (pedantic && decl_context == FIELD |
6050 | && variably_modified_type_p (type, NULL_TREE)) | |
6051 | { | |
6052 | /* C99 6.7.2.1p8 */ | |
29438999 | 6053 | pedwarn (loc, OPT_Wpedantic, "a member of a structure or union cannot " |
e60a6f7b | 6054 | "have a variably modified type"); |
32d33ab2 | 6055 | } |
6056 | ||
896f20c3 | 6057 | /* Aside from typedefs and type names (handle above), |
6058 | `void' at top level (not within pointer) | |
6059 | is allowed only in public variables. | |
51ef3909 | 6060 | We don't complain about parms either, but that is because |
6061 | a better error message can be made later. */ | |
6062 | ||
5c803577 | 6063 | if (VOID_TYPE_P (type) && decl_context != PARM |
84166705 | 6064 | && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE) |
feb04535 | 6065 | && (storage_class == csc_extern |
393b349a | 6066 | || (current_scope == file_scope |
feb04535 | 6067 | && !(storage_class == csc_static |
6068 | || storage_class == csc_register))))) | |
51ef3909 | 6069 | { |
e60a6f7b | 6070 | error_at (loc, "variable or field %qE declared void", name); |
51ef3909 | 6071 | type = integer_type_node; |
6072 | } | |
6073 | ||
6074 | /* Now create the decl, which may be a VAR_DECL, a PARM_DECL | |
6075 | or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */ | |
6076 | ||
6077 | { | |
e3c541f0 | 6078 | tree decl; |
51ef3909 | 6079 | |
6080 | if (decl_context == PARM) | |
6081 | { | |
e94026da | 6082 | tree promoted_type; |
87d59e72 | 6083 | bool array_parameter_p = false; |
51ef3909 | 6084 | |
6085 | /* A parameter declared as an array of T is really a pointer to T. | |
6086 | One declared as a function is really a pointer to a function. */ | |
6087 | ||
6088 | if (TREE_CODE (type) == ARRAY_TYPE) | |
6089 | { | |
6090 | /* Transfer const-ness of array into that of type pointed to. */ | |
c7b1c5d8 | 6091 | type = TREE_TYPE (type); |
a5b1863e | 6092 | if (type_quals) |
6093 | type = c_build_qualified_type (type, type_quals); | |
7714837c | 6094 | type = c_build_pointer_type (type); |
bb476216 | 6095 | type_quals = array_ptr_quals; |
eb52d13a | 6096 | if (type_quals) |
6097 | type = c_build_qualified_type (type, type_quals); | |
1fd94215 | 6098 | |
bb476216 | 6099 | /* We don't yet implement attributes in this context. */ |
6100 | if (array_ptr_attrs != NULL_TREE) | |
e60a6f7b | 6101 | warning_at (loc, OPT_Wattributes, |
6102 | "attributes in parameter array declarator ignored"); | |
1fd94215 | 6103 | |
b99f3c92 | 6104 | size_varies = false; |
87d59e72 | 6105 | array_parameter_p = true; |
51ef3909 | 6106 | } |
6107 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
6108 | { | |
b560fabd | 6109 | if (type_quals & TYPE_QUAL_ATOMIC) |
6110 | { | |
6111 | error_at (loc, | |
6112 | "%<_Atomic%>-qualified function type"); | |
6113 | type_quals &= ~TYPE_QUAL_ATOMIC; | |
6114 | } | |
6115 | else if (type_quals) | |
29438999 | 6116 | pedwarn (loc, OPT_Wpedantic, |
21ca8540 | 6117 | "ISO C forbids qualified function types"); |
a5b1863e | 6118 | if (type_quals) |
6119 | type = c_build_qualified_type (type, type_quals); | |
7714837c | 6120 | type = c_build_pointer_type (type); |
a5b1863e | 6121 | type_quals = TYPE_UNQUALIFIED; |
51ef3909 | 6122 | } |
7c772c9a | 6123 | else if (type_quals) |
6124 | type = c_build_qualified_type (type, type_quals); | |
1cae46be | 6125 | |
e60a6f7b | 6126 | decl = build_decl (declarator->id_loc, |
6127 | PARM_DECL, declarator->u.id, type); | |
08f8d953 | 6128 | if (size_varies) |
51ef3909 | 6129 | C_DECL_VARIABLE_SIZE (decl) = 1; |
87d59e72 | 6130 | C_ARRAY_PARAMETER (decl) = array_parameter_p; |
51ef3909 | 6131 | |
6132 | /* Compute the type actually passed in the parmlist, | |
6133 | for the case where there is no prototype. | |
6134 | (For example, shorts and chars are passed as ints.) | |
6135 | When there is a prototype, this is overridden later. */ | |
6136 | ||
e94026da | 6137 | if (type == error_mark_node) |
6138 | promoted_type = type; | |
6139 | else | |
63c62881 | 6140 | promoted_type = c_type_promotes_to (type); |
51ef3909 | 6141 | |
e94026da | 6142 | DECL_ARG_TYPE (decl) = promoted_type; |
ebdbd341 | 6143 | if (declspecs->inline_p) |
e60a6f7b | 6144 | pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl); |
985c6e3a | 6145 | if (declspecs->noreturn_p) |
6146 | pedwarn (loc, 0, "parameter %q+D declared %<_Noreturn%>", decl); | |
51ef3909 | 6147 | } |
6148 | else if (decl_context == FIELD) | |
6149 | { | |
ebdbd341 | 6150 | /* Note that the grammar rejects storage classes in typenames |
6151 | and fields. */ | |
6152 | gcc_assert (storage_class == csc_none && !threadp | |
985c6e3a | 6153 | && !declspecs->inline_p && !declspecs->noreturn_p); |
ebdbd341 | 6154 | |
51ef3909 | 6155 | /* Structure field. It may not be a function. */ |
b9d8dcc9 | 6156 | |
51ef3909 | 6157 | if (TREE_CODE (type) == FUNCTION_TYPE) |
6158 | { | |
e60a6f7b | 6159 | error_at (loc, "field %qE declared as a function", name); |
51ef3909 | 6160 | type = build_pointer_type (type); |
6161 | } | |
4b72716d | 6162 | else if (TREE_CODE (type) != ERROR_MARK |
a0c938f0 | 6163 | && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type)) |
51ef3909 | 6164 | { |
7f824b22 | 6165 | if (name) |
e60a6f7b | 6166 | error_at (loc, "field %qE has incomplete type", name); |
7f824b22 | 6167 | else |
e60a6f7b | 6168 | error_at (loc, "unnamed field has incomplete type"); |
51ef3909 | 6169 | type = error_mark_node; |
6170 | } | |
aebc8537 | 6171 | type = c_build_qualified_type (type, type_quals); |
e60a6f7b | 6172 | decl = build_decl (declarator->id_loc, |
6173 | FIELD_DECL, declarator->u.id, type); | |
851dfbff | 6174 | DECL_NONADDRESSABLE_P (decl) = bitfield; |
78ba9fed | 6175 | if (bitfield && !declarator->u.id) |
6176 | TREE_NO_WARNING (decl) = 1; | |
851dfbff | 6177 | |
08f8d953 | 6178 | if (size_varies) |
51ef3909 | 6179 | C_DECL_VARIABLE_SIZE (decl) = 1; |
6180 | } | |
6181 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
6182 | { | |
feb04535 | 6183 | if (storage_class == csc_register || threadp) |
91d51df3 | 6184 | { |
e60a6f7b | 6185 | error_at (loc, "invalid storage class for function %qE", name); |
5568b3c6 | 6186 | } |
72394149 | 6187 | else if (current_scope != file_scope) |
6188 | { | |
6189 | /* Function declaration not at file scope. Storage | |
6190 | classes other than `extern' are not allowed, C99 | |
6191 | 6.7.1p5, and `extern' makes no difference. However, | |
6192 | GCC allows 'auto', perhaps with 'inline', to support | |
6193 | nested functions. */ | |
feb04535 | 6194 | if (storage_class == csc_auto) |
29438999 | 6195 | pedwarn (loc, OPT_Wpedantic, |
d1dd9ac0 | 6196 | "invalid storage class for function %qE", name); |
61ba37bf | 6197 | else if (storage_class == csc_static) |
91d51df3 | 6198 | { |
e60a6f7b | 6199 | error_at (loc, "invalid storage class for function %qE", name); |
a0c938f0 | 6200 | if (funcdef_flag) |
61ba37bf | 6201 | storage_class = declspecs->storage_class = csc_none; |
6202 | else | |
6203 | return 0; | |
91d51df3 | 6204 | } |
72394149 | 6205 | } |
b3319231 | 6206 | |
e60a6f7b | 6207 | decl = build_decl (declarator->id_loc, |
6208 | FUNCTION_DECL, declarator->u.id, type); | |
61ba37bf | 6209 | decl = build_decl_attribute_variant (decl, decl_attr); |
6210 | ||
b560fabd | 6211 | if (type_quals & TYPE_QUAL_ATOMIC) |
6212 | { | |
6213 | error_at (loc, | |
6214 | "%<_Atomic%>-qualified function type"); | |
6215 | type_quals &= ~TYPE_QUAL_ATOMIC; | |
6216 | } | |
6217 | else if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl)) | |
29438999 | 6218 | pedwarn (loc, OPT_Wpedantic, |
8864917d | 6219 | "ISO C forbids qualified function types"); |
51ef3909 | 6220 | |
b3e83e1e | 6221 | /* Every function declaration is an external reference |
6222 | (DECL_EXTERNAL) except for those which are not at file | |
6223 | scope and are explicitly declared "auto". This is | |
6224 | forbidden by standard C (C99 6.7.1p5) and is interpreted by | |
6225 | GCC to signify a forward declaration of a nested function. */ | |
feb04535 | 6226 | if (storage_class == csc_auto && current_scope != file_scope) |
b3e83e1e | 6227 | DECL_EXTERNAL (decl) = 0; |
c42cc79e | 6228 | /* In C99, a function which is declared 'inline' with 'extern' |
6229 | is not an external reference (which is confusing). It | |
6230 | means that the later definition of the function must be output | |
6231 | in this file, C99 6.7.4p6. In GNU C89, a function declared | |
6232 | 'extern inline' is an external reference. */ | |
6233 | else if (declspecs->inline_p && storage_class != csc_static) | |
11950bdd | 6234 | DECL_EXTERNAL (decl) = ((storage_class == csc_extern) |
6235 | == flag_gnu89_inline); | |
b3e83e1e | 6236 | else |
c42cc79e | 6237 | DECL_EXTERNAL (decl) = !initialized; |
491e04ef | 6238 | |
51ef3909 | 6239 | /* Record absence of global scope for `static' or `auto'. */ |
6240 | TREE_PUBLIC (decl) | |
feb04535 | 6241 | = !(storage_class == csc_static || storage_class == csc_auto); |
dcde0ff5 | 6242 | |
a89ce285 | 6243 | /* For a function definition, record the argument information |
731e6cbf | 6244 | block where store_parm_decls will look for it. */ |
a89ce285 | 6245 | if (funcdef_flag) |
731e6cbf | 6246 | current_function_arg_info = arg_info; |
a89ce285 | 6247 | |
70dd11f7 | 6248 | if (declspecs->default_int_p) |
af857942 | 6249 | C_FUNCTION_IMPLICIT_INT (decl) = 1; |
6250 | ||
985c6e3a | 6251 | /* Record presence of `inline' and `_Noreturn', if it is |
6252 | reasonable. */ | |
ebdbd341 | 6253 | if (flag_hosted && MAIN_NAME_P (declarator->u.id)) |
51ef3909 | 6254 | { |
feb04535 | 6255 | if (declspecs->inline_p) |
e60a6f7b | 6256 | pedwarn (loc, 0, "cannot inline function %<main%>"); |
985c6e3a | 6257 | if (declspecs->noreturn_p) |
6258 | pedwarn (loc, 0, "%<main%> declared %<_Noreturn%>"); | |
6259 | } | |
6260 | else | |
6261 | { | |
6262 | if (declspecs->inline_p) | |
6263 | /* Record that the function is declared `inline'. */ | |
6264 | DECL_DECLARED_INLINE_P (decl) = 1; | |
6265 | if (declspecs->noreturn_p) | |
4755ceab | 6266 | { |
508ea33a | 6267 | if (flag_isoc99) |
6268 | pedwarn_c99 (loc, OPT_Wpedantic, | |
4755ceab | 6269 | "ISO C99 does not support %<_Noreturn%>"); |
508ea33a | 6270 | else |
6271 | pedwarn_c99 (loc, OPT_Wpedantic, | |
4755ceab | 6272 | "ISO C90 does not support %<_Noreturn%>"); |
4755ceab | 6273 | TREE_THIS_VOLATILE (decl) = 1; |
6274 | } | |
3b288406 | 6275 | } |
51ef3909 | 6276 | } |
6277 | else | |
6278 | { | |
6279 | /* It's a variable. */ | |
b3319231 | 6280 | /* An uninitialized decl with `extern' is a reference. */ |
feb04535 | 6281 | int extern_ref = !initialized && storage_class == csc_extern; |
51ef3909 | 6282 | |
aebc8537 | 6283 | type = c_build_qualified_type (type, type_quals); |
c2621053 | 6284 | |
393b349a | 6285 | /* C99 6.2.2p7: It is invalid (compile-time undefined |
6286 | behavior) to create an 'extern' declaration for a | |
c2621053 | 6287 | variable if there is a global declaration that is |
393b349a | 6288 | 'static' and the global declaration is not visible. |
6289 | (If the static declaration _is_ currently visible, | |
6290 | the 'extern' declaration is taken to refer to that decl.) */ | |
6291 | if (extern_ref && current_scope != file_scope) | |
c2621053 | 6292 | { |
ac206aff | 6293 | tree global_decl = identifier_global_value (declarator->u.id); |
6294 | tree visible_decl = lookup_name (declarator->u.id); | |
c2621053 | 6295 | |
1cae46be | 6296 | if (global_decl |
393b349a | 6297 | && global_decl != visible_decl |
c2621053 | 6298 | && TREE_CODE (global_decl) == VAR_DECL |
6299 | && !TREE_PUBLIC (global_decl)) | |
e60a6f7b | 6300 | error_at (loc, "variable previously declared %<static%> " |
6301 | "redeclared %<extern%>"); | |
c2621053 | 6302 | } |
6303 | ||
e60a6f7b | 6304 | decl = build_decl (declarator->id_loc, |
6305 | VAR_DECL, declarator->u.id, type); | |
08f8d953 | 6306 | if (size_varies) |
51ef3909 | 6307 | C_DECL_VARIABLE_SIZE (decl) = 1; |
6308 | ||
feb04535 | 6309 | if (declspecs->inline_p) |
e60a6f7b | 6310 | pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl); |
985c6e3a | 6311 | if (declspecs->noreturn_p) |
6312 | pedwarn (loc, 0, "variable %q+D declared %<_Noreturn%>", decl); | |
51ef3909 | 6313 | |
8dfad60e | 6314 | /* At file scope, an initialized extern declaration may follow |
6315 | a static declaration. In that case, DECL_EXTERNAL will be | |
6316 | reset later in start_decl. */ | |
feb04535 | 6317 | DECL_EXTERNAL (decl) = (storage_class == csc_extern); |
2a6f0f81 | 6318 | |
6e899616 | 6319 | /* At file scope, the presence of a `static' or `register' storage |
76665aeb | 6320 | class specifier, or the absence of all storage class specifiers |
6321 | makes this declaration a definition (perhaps tentative). Also, | |
23bf35fe | 6322 | the absence of `static' makes it public. */ |
393b349a | 6323 | if (current_scope == file_scope) |
51ef3909 | 6324 | { |
23bf35fe | 6325 | TREE_PUBLIC (decl) = storage_class != csc_static; |
2a6f0f81 | 6326 | TREE_STATIC (decl) = !extern_ref; |
51ef3909 | 6327 | } |
6e899616 | 6328 | /* Not at file scope, only `static' makes a static definition. */ |
51ef3909 | 6329 | else |
6330 | { | |
feb04535 | 6331 | TREE_STATIC (decl) = (storage_class == csc_static); |
2a6f0f81 | 6332 | TREE_PUBLIC (decl) = extern_ref; |
6333 | } | |
6334 | ||
feb04535 | 6335 | if (threadp) |
5e68df57 | 6336 | set_decl_tls_model (decl, decl_default_tls_model (decl)); |
51ef3909 | 6337 | } |
6338 | ||
1d9b9611 | 6339 | if ((storage_class == csc_extern |
6340 | || (storage_class == csc_none | |
6341 | && TREE_CODE (type) == FUNCTION_TYPE | |
6342 | && !funcdef_flag)) | |
32d33ab2 | 6343 | && variably_modified_type_p (type, NULL_TREE)) |
6344 | { | |
6345 | /* C99 6.7.5.2p2 */ | |
1d9b9611 | 6346 | if (TREE_CODE (type) == FUNCTION_TYPE) |
e60a6f7b | 6347 | error_at (loc, "non-nested function with variably modified type"); |
1d9b9611 | 6348 | else |
e60a6f7b | 6349 | error_at (loc, "object with variably modified type must have " |
6350 | "no linkage"); | |
32d33ab2 | 6351 | } |
6352 | ||
51ef3909 | 6353 | /* Record `register' declaration for warnings on & |
6354 | and in case doing stupid register allocation. */ | |
6355 | ||
feb04535 | 6356 | if (storage_class == csc_register) |
7746224a | 6357 | { |
6358 | C_DECL_REGISTER (decl) = 1; | |
6359 | DECL_REGISTER (decl) = 1; | |
6360 | } | |
51ef3909 | 6361 | |
6362 | /* Record constancy and volatility. */ | |
a5b1863e | 6363 | c_apply_type_quals_to_decl (type_quals, decl); |
51ef3909 | 6364 | |
83e25171 | 6365 | /* Apply _Alignas specifiers. */ |
6366 | if (alignas_align) | |
6367 | { | |
6368 | DECL_ALIGN (decl) = alignas_align * BITS_PER_UNIT; | |
6369 | DECL_USER_ALIGN (decl) = 1; | |
6370 | } | |
6371 | ||
51ef3909 | 6372 | /* If a type has volatile components, it should be stored in memory. |
6373 | Otherwise, the fact that those components are volatile | |
5ded8c6f | 6374 | will be ignored, and would even crash the compiler. |
6375 | Of course, this only makes sense on VAR,PARM, and RESULT decl's. */ | |
6376 | if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)) | |
6377 | && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL | |
6378 | || TREE_CODE (decl) == RESULT_DECL)) | |
7746224a | 6379 | { |
6380 | /* It is not an error for a structure with volatile fields to | |
6381 | be declared register, but reset DECL_REGISTER since it | |
6382 | cannot actually go in a register. */ | |
6383 | int was_reg = C_DECL_REGISTER (decl); | |
6384 | C_DECL_REGISTER (decl) = 0; | |
6385 | DECL_REGISTER (decl) = 0; | |
6386 | c_mark_addressable (decl); | |
6387 | C_DECL_REGISTER (decl) = was_reg; | |
6388 | } | |
51ef3909 | 6389 | |
418089c3 | 6390 | /* This is the earliest point at which we might know the assembler |
6391 | name of a variable. Thus, if it's known before this, die horribly. */ | |
231bd014 | 6392 | gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl)); |
418089c3 | 6393 | |
4a76ab2a | 6394 | if (warn_cxx_compat |
6395 | && TREE_CODE (decl) == VAR_DECL | |
6396 | && TREE_PUBLIC (decl) | |
6397 | && TREE_STATIC (decl) | |
6398 | && (TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE | |
6399 | || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE | |
6400 | || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE) | |
6401 | && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE) | |
6402 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat, | |
6403 | ("non-local variable %qD with anonymous type is " | |
6404 | "questionable in C++"), | |
6405 | decl); | |
6406 | ||
51ef3909 | 6407 | return decl; |
6408 | } | |
6409 | } | |
6410 | \f | |
51ef3909 | 6411 | /* Decode the parameter-list info for a function type or function definition. |
32d33ab2 | 6412 | The argument is the value returned by `get_parm_info' (or made in c-parse.c |
51ef3909 | 6413 | if there is an identifier list instead of a parameter decl list). |
6414 | These two functions are separate because when a function returns | |
6415 | or receives functions then each is called multiple times but the order | |
6416 | of calls is different. The last call to `grokparms' is always the one | |
6417 | that contains the formal parameter names of a function definition. | |
6418 | ||
51ef3909 | 6419 | Return a list of arg types to use in the FUNCTION_TYPE for this function. |
6420 | ||
4a125bfc | 6421 | FUNCDEF_FLAG is true for a function definition, false for |
51ef3909 | 6422 | a mere declaration. A nonempty identifier-list gets an error message |
4a125bfc | 6423 | when FUNCDEF_FLAG is false. */ |
51ef3909 | 6424 | |
6425 | static tree | |
ac206aff | 6426 | grokparms (struct c_arg_info *arg_info, bool funcdef_flag) |
51ef3909 | 6427 | { |
ac206aff | 6428 | tree arg_types = arg_info->types; |
51ef3909 | 6429 | |
32d33ab2 | 6430 | if (funcdef_flag && arg_info->had_vla_unspec) |
6431 | { | |
6432 | /* A function definition isn't function prototype scope C99 6.2.1p4. */ | |
6433 | /* C99 6.7.5.2p4 */ | |
6434 | error ("%<[*]%> not allowed in other than function prototype scope"); | |
6435 | } | |
6436 | ||
3df42822 | 6437 | if (arg_types == 0 && !funcdef_flag |
6438 | && !in_system_header_at (input_location)) | |
6bf97f82 | 6439 | warning (OPT_Wstrict_prototypes, |
6440 | "function declaration isn%'t a prototype"); | |
51ef3909 | 6441 | |
393b349a | 6442 | if (arg_types == error_mark_node) |
6443 | return 0; /* don't set TYPE_ARG_TYPES in this case */ | |
6444 | ||
6445 | else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE) | |
51ef3909 | 6446 | { |
84166705 | 6447 | if (!funcdef_flag) |
35974859 | 6448 | { |
6449 | pedwarn (input_location, 0, "parameter names (without types) in function declaration"); | |
6450 | arg_info->parms = NULL_TREE; | |
6451 | } | |
6452 | else | |
6453 | arg_info->parms = arg_info->types; | |
51ef3909 | 6454 | |
ac206aff | 6455 | arg_info->types = 0; |
51ef3909 | 6456 | return 0; |
6457 | } | |
6458 | else | |
6459 | { | |
a89ce285 | 6460 | tree parm, type, typelt; |
6461 | unsigned int parmno; | |
2b3c93a3 | 6462 | const char *errmsg; |
a89ce285 | 6463 | |
a207ca5e | 6464 | /* If there is a parameter of incomplete type in a definition, |
6465 | this is an error. In a declaration this is valid, and a | |
6466 | struct or union type may be completed later, before any calls | |
6467 | or definition of the function. In the case where the tag was | |
6468 | first declared within the parameter list, a warning has | |
6469 | already been given. If a parameter has void type, then | |
6470 | however the function cannot be defined or called, so | |
6471 | warn. */ | |
a89ce285 | 6472 | |
ac206aff | 6473 | for (parm = arg_info->parms, typelt = arg_types, parmno = 1; |
2b652cf3 | 6474 | parm; |
1767a056 | 6475 | parm = DECL_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++) |
a89ce285 | 6476 | { |
6477 | type = TREE_VALUE (typelt); | |
6478 | if (type == error_mark_node) | |
6479 | continue; | |
6480 | ||
6481 | if (!COMPLETE_TYPE_P (type)) | |
6482 | { | |
6483 | if (funcdef_flag) | |
6484 | { | |
6485 | if (DECL_NAME (parm)) | |
712d2297 | 6486 | error_at (input_location, |
6487 | "parameter %u (%q+D) has incomplete type", | |
6488 | parmno, parm); | |
a89ce285 | 6489 | else |
712d2297 | 6490 | error_at (DECL_SOURCE_LOCATION (parm), |
6491 | "parameter %u has incomplete type", | |
6492 | parmno); | |
51ef3909 | 6493 | |
a89ce285 | 6494 | TREE_VALUE (typelt) = error_mark_node; |
6495 | TREE_TYPE (parm) = error_mark_node; | |
25910510 | 6496 | arg_types = NULL_TREE; |
a89ce285 | 6497 | } |
a207ca5e | 6498 | else if (VOID_TYPE_P (type)) |
a89ce285 | 6499 | { |
6500 | if (DECL_NAME (parm)) | |
712d2297 | 6501 | warning_at (input_location, 0, |
6502 | "parameter %u (%q+D) has void type", | |
6503 | parmno, parm); | |
a89ce285 | 6504 | else |
712d2297 | 6505 | warning_at (DECL_SOURCE_LOCATION (parm), 0, |
6506 | "parameter %u has void type", | |
6507 | parmno); | |
a89ce285 | 6508 | } |
6509 | } | |
40c4b476 | 6510 | |
2b3c93a3 | 6511 | errmsg = targetm.invalid_parameter_type (type); |
6512 | if (errmsg) | |
6513 | { | |
6514 | error (errmsg); | |
6515 | TREE_VALUE (typelt) = error_mark_node; | |
6516 | TREE_TYPE (parm) = error_mark_node; | |
25910510 | 6517 | arg_types = NULL_TREE; |
2b3c93a3 | 6518 | } |
6519 | ||
40c4b476 | 6520 | if (DECL_NAME (parm) && TREE_USED (parm)) |
6521 | warn_if_shadowing (parm); | |
a89ce285 | 6522 | } |
6523 | return arg_types; | |
51ef3909 | 6524 | } |
6525 | } | |
6526 | ||
cfbfcd0b | 6527 | /* Allocate and initialize a c_arg_info structure from the parser's |
6528 | obstack. */ | |
6529 | ||
6530 | struct c_arg_info * | |
6531 | build_arg_info (void) | |
6532 | { | |
6533 | struct c_arg_info *ret = XOBNEW (&parser_obstack, struct c_arg_info); | |
6534 | ret->parms = NULL_TREE; | |
6535 | ret->tags = NULL; | |
6536 | ret->types = NULL_TREE; | |
6537 | ret->others = NULL_TREE; | |
6538 | ret->pending_sizes = NULL; | |
6539 | ret->had_vla_unspec = 0; | |
6540 | return ret; | |
6541 | } | |
6542 | ||
ac206aff | 6543 | /* Take apart the current scope and return a c_arg_info structure with |
6544 | info on a parameter list just parsed. | |
a89ce285 | 6545 | |
ac206aff | 6546 | This structure is later fed to 'grokparms' and 'store_parm_decls'. |
51ef3909 | 6547 | |
393b349a | 6548 | ELLIPSIS being true means the argument list ended in '...' so don't |
4232a958 | 6549 | append a sentinel (void_list_node) to the end of the type-list. |
6550 | ||
6551 | EXPR is NULL or an expression that needs to be evaluated for the | |
6552 | side effects of array size expressions in the parameters. */ | |
51ef3909 | 6553 | |
ac206aff | 6554 | struct c_arg_info * |
4232a958 | 6555 | get_parm_info (bool ellipsis, tree expr) |
51ef3909 | 6556 | { |
393b349a | 6557 | struct c_binding *b = current_scope->bindings; |
cfbfcd0b | 6558 | struct c_arg_info *arg_info = build_arg_info (); |
6559 | ||
393b349a | 6560 | tree parms = 0; |
f1f41a6c | 6561 | vec<c_arg_tag, va_gc> *tags = NULL; |
393b349a | 6562 | tree types = 0; |
6563 | tree others = 0; | |
6564 | ||
f74be9a1 | 6565 | static bool explained_incomplete_types = false; |
6566 | bool gave_void_only_once_err = false; | |
6567 | ||
32d33ab2 | 6568 | arg_info->had_vla_unspec = current_scope->had_vla_unspec; |
ac206aff | 6569 | |
393b349a | 6570 | /* The bindings in this scope must not get put into a block. |
6571 | We will take care of deleting the binding nodes. */ | |
6572 | current_scope->bindings = 0; | |
51ef3909 | 6573 | |
393b349a | 6574 | /* This function is only called if there was *something* on the |
6575 | parameter list. */ | |
231bd014 | 6576 | gcc_assert (b); |
f74be9a1 | 6577 | |
393b349a | 6578 | /* A parameter list consisting solely of 'void' indicates that the |
6579 | function takes no arguments. But if the 'void' is qualified | |
6580 | (by 'const' or 'volatile'), or has a storage class specifier | |
6581 | ('register'), then the behavior is undefined; issue an error. | |
6582 | Typedefs for 'void' are OK (see DR#157). */ | |
a0c938f0 | 6583 | if (b->prev == 0 /* one binding */ |
393b349a | 6584 | && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */ |
6585 | && !DECL_NAME (b->decl) /* anonymous */ | |
6586 | && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */ | |
6587 | { | |
b560fabd | 6588 | if (TYPE_QUALS (TREE_TYPE (b->decl)) != TYPE_UNQUALIFIED |
7746224a | 6589 | || C_DECL_REGISTER (b->decl)) |
b0b1af64 | 6590 | error ("%<void%> as only parameter may not be qualified"); |
f74be9a1 | 6591 | |
393b349a | 6592 | /* There cannot be an ellipsis. */ |
6593 | if (ellipsis) | |
b0b1af64 | 6594 | error ("%<void%> must be the only parameter"); |
51ef3909 | 6595 | |
ac206aff | 6596 | arg_info->types = void_list_node; |
393b349a | 6597 | return arg_info; |
51ef3909 | 6598 | } |
6599 | ||
393b349a | 6600 | if (!ellipsis) |
6601 | types = void_list_node; | |
51ef3909 | 6602 | |
393b349a | 6603 | /* Break up the bindings list into parms, tags, types, and others; |
6604 | apply sanity checks; purge the name-to-decl bindings. */ | |
6605 | while (b) | |
51ef3909 | 6606 | { |
393b349a | 6607 | tree decl = b->decl; |
6608 | tree type = TREE_TYPE (decl); | |
e82e4eb5 | 6609 | c_arg_tag tag; |
f74be9a1 | 6610 | const char *keyword; |
f74be9a1 | 6611 | |
393b349a | 6612 | switch (TREE_CODE (decl)) |
4214af46 | 6613 | { |
393b349a | 6614 | case PARM_DECL: |
6615 | if (b->id) | |
6616 | { | |
231bd014 | 6617 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); |
393b349a | 6618 | I_SYMBOL_BINDING (b->id) = b->shadowed; |
6619 | } | |
f74be9a1 | 6620 | |
393b349a | 6621 | /* Check for forward decls that never got their actual decl. */ |
6622 | if (TREE_ASM_WRITTEN (decl)) | |
3cf8b391 | 6623 | error ("parameter %q+D has just a forward declaration", decl); |
393b349a | 6624 | /* Check for (..., void, ...) and issue an error. */ |
6625 | else if (VOID_TYPE_P (type) && !DECL_NAME (decl)) | |
6626 | { | |
6627 | if (!gave_void_only_once_err) | |
6628 | { | |
b0b1af64 | 6629 | error ("%<void%> must be the only parameter"); |
393b349a | 6630 | gave_void_only_once_err = true; |
6631 | } | |
6632 | } | |
6633 | else | |
6634 | { | |
6635 | /* Valid parameter, add it to the list. */ | |
1767a056 | 6636 | DECL_CHAIN (decl) = parms; |
393b349a | 6637 | parms = decl; |
6638 | ||
6639 | /* Since there is a prototype, args are passed in their | |
6640 | declared types. The back end may override this later. */ | |
6641 | DECL_ARG_TYPE (decl) = type; | |
6642 | types = tree_cons (0, type, types); | |
6643 | } | |
6644 | break; | |
f74be9a1 | 6645 | |
51acdf76 | 6646 | case ENUMERAL_TYPE: keyword = "enum"; goto tag; |
393b349a | 6647 | case UNION_TYPE: keyword = "union"; goto tag; |
51acdf76 | 6648 | case RECORD_TYPE: keyword = "struct"; goto tag; |
393b349a | 6649 | tag: |
6650 | /* Types may not have tag-names, in which case the type | |
6651 | appears in the bindings list with b->id NULL. */ | |
6652 | if (b->id) | |
6653 | { | |
231bd014 | 6654 | gcc_assert (I_TAG_BINDING (b->id) == b); |
393b349a | 6655 | I_TAG_BINDING (b->id) = b->shadowed; |
6656 | } | |
f74be9a1 | 6657 | |
393b349a | 6658 | /* Warn about any struct, union or enum tags defined in a |
6659 | parameter list. The scope of such types is limited to | |
6660 | the parameter list, which is rarely if ever desirable | |
6661 | (it's impossible to call such a function with type- | |
6662 | correct arguments). An anonymous union parm type is | |
6663 | meaningful as a GNU extension, so don't warn for that. */ | |
6664 | if (TREE_CODE (decl) != UNION_TYPE || b->id != 0) | |
6665 | { | |
6666 | if (b->id) | |
6667 | /* The %s will be one of 'struct', 'union', or 'enum'. */ | |
c3ceba8e | 6668 | warning (0, "%<%s %E%> declared inside parameter list", |
393b349a | 6669 | keyword, b->id); |
6670 | else | |
6671 | /* The %s will be one of 'struct', 'union', or 'enum'. */ | |
c3ceba8e | 6672 | warning (0, "anonymous %s declared inside parameter list", |
393b349a | 6673 | keyword); |
14338e9a | 6674 | |
84166705 | 6675 | if (!explained_incomplete_types) |
393b349a | 6676 | { |
c3ceba8e | 6677 | warning (0, "its scope is only this definition or declaration," |
393b349a | 6678 | " which is probably not what you want"); |
6679 | explained_incomplete_types = true; | |
6680 | } | |
6681 | } | |
f74be9a1 | 6682 | |
e82e4eb5 | 6683 | tag.id = b->id; |
6684 | tag.type = decl; | |
f1f41a6c | 6685 | vec_safe_push (tags, tag); |
393b349a | 6686 | break; |
6687 | ||
6688 | case CONST_DECL: | |
6689 | case TYPE_DECL: | |
702c8527 | 6690 | case FUNCTION_DECL: |
393b349a | 6691 | /* CONST_DECLs appear here when we have an embedded enum, |
6692 | and TYPE_DECLs appear here when we have an embedded struct | |
6693 | or union. No warnings for this - we already warned about the | |
702c8527 | 6694 | type itself. FUNCTION_DECLs appear when there is an implicit |
6695 | function declaration in the parameter list. */ | |
6696 | ||
1799fbab | 6697 | /* When we reinsert this decl in the function body, we need |
6698 | to reconstruct whether it was marked as nested. */ | |
6699 | gcc_assert (TREE_CODE (decl) == FUNCTION_DECL | |
6700 | ? b->nested | |
6701 | : !b->nested); | |
1767a056 | 6702 | DECL_CHAIN (decl) = others; |
56533c31 | 6703 | others = decl; |
6704 | /* fall through */ | |
6705 | ||
6706 | case ERROR_MARK: | |
6707 | /* error_mark_node appears here when we have an undeclared | |
6708 | variable. Just throw it away. */ | |
393b349a | 6709 | if (b->id) |
6710 | { | |
231bd014 | 6711 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); |
393b349a | 6712 | I_SYMBOL_BINDING (b->id) = b->shadowed; |
6713 | } | |
393b349a | 6714 | break; |
6715 | ||
6716 | /* Other things that might be encountered. */ | |
6717 | case LABEL_DECL: | |
393b349a | 6718 | case VAR_DECL: |
393b349a | 6719 | default: |
231bd014 | 6720 | gcc_unreachable (); |
393b349a | 6721 | } |
6722 | ||
6723 | b = free_binding_and_advance (b); | |
f74be9a1 | 6724 | } |
6725 | ||
ac206aff | 6726 | arg_info->parms = parms; |
6727 | arg_info->tags = tags; | |
6728 | arg_info->types = types; | |
6729 | arg_info->others = others; | |
4232a958 | 6730 | arg_info->pending_sizes = expr; |
393b349a | 6731 | return arg_info; |
51ef3909 | 6732 | } |
6733 | \f | |
6734 | /* Get the struct, enum or union (CODE says which) with tag NAME. | |
e60a6f7b | 6735 | Define the tag as a forward-reference with location LOC if it is |
6736 | not defined. Return a c_typespec structure for the type | |
6737 | specifier. */ | |
51ef3909 | 6738 | |
19702c1d | 6739 | struct c_typespec |
e60a6f7b | 6740 | parser_xref_tag (location_t loc, enum tree_code code, tree name) |
51ef3909 | 6741 | { |
19702c1d | 6742 | struct c_typespec ret; |
a75b1c71 | 6743 | tree ref; |
0b09525f | 6744 | location_t refloc; |
a75b1c71 | 6745 | |
6746 | ret.expr = NULL_TREE; | |
6747 | ret.expr_const_operands = true; | |
6748 | ||
51ef3909 | 6749 | /* If a cross reference is requested, look up the type |
6750 | already defined for this tag and return it. */ | |
6751 | ||
0b09525f | 6752 | ref = lookup_tag (code, name, 0, &refloc); |
ea97174b | 6753 | /* If this is the right type of tag, return what we found. |
6754 | (This reference will be shadowed by shadow_tag later if appropriate.) | |
6755 | If this is the wrong type of tag, do not return it. If it was the | |
6e899616 | 6756 | wrong type in the same scope, we will have had an error |
6757 | message already; if in a different scope and declaring | |
ea97174b | 6758 | a name, pending_xref_error will give an error message; but if in a |
6e899616 | 6759 | different scope and not declaring a name, this tag should |
ea97174b | 6760 | shadow the previous declaration of a different type of tag, and |
6761 | this would not work properly if we return the reference found. | |
6762 | (For example, with "struct foo" in an outer scope, "union foo;" | |
6763 | must shadow that tag with a new one of union type.) */ | |
19702c1d | 6764 | ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref); |
ea97174b | 6765 | if (ref && TREE_CODE (ref) == code) |
19702c1d | 6766 | { |
0b09525f | 6767 | if (C_TYPE_DEFINED_IN_STRUCT (ref) |
6768 | && loc != UNKNOWN_LOCATION | |
6769 | && warn_cxx_compat) | |
6770 | { | |
6771 | switch (code) | |
6772 | { | |
6773 | case ENUMERAL_TYPE: | |
6774 | warning_at (loc, OPT_Wc___compat, | |
6775 | ("enum type defined in struct or union " | |
6776 | "is not visible in C++")); | |
6777 | inform (refloc, "enum type defined here"); | |
6778 | break; | |
6779 | case RECORD_TYPE: | |
6780 | warning_at (loc, OPT_Wc___compat, | |
6781 | ("struct defined in struct or union " | |
6782 | "is not visible in C++")); | |
6783 | inform (refloc, "struct defined here"); | |
6784 | break; | |
6785 | case UNION_TYPE: | |
6786 | warning_at (loc, OPT_Wc___compat, | |
6787 | ("union defined in struct or union " | |
6788 | "is not visible in C++")); | |
6789 | inform (refloc, "union defined here"); | |
6790 | break; | |
6791 | default: | |
6792 | gcc_unreachable(); | |
6793 | } | |
6794 | } | |
6795 | ||
19702c1d | 6796 | ret.spec = ref; |
6797 | return ret; | |
6798 | } | |
51ef3909 | 6799 | |
51ef3909 | 6800 | /* If no such tag is yet defined, create a forward-reference node |
6801 | and record it as the "definition". | |
6802 | When a real declaration of this type is found, | |
6803 | the forward-reference will be altered into a real type. */ | |
6804 | ||
6805 | ref = make_node (code); | |
6806 | if (code == ENUMERAL_TYPE) | |
6807 | { | |
51ef3909 | 6808 | /* Give the type a default layout like unsigned int |
6809 | to avoid crashing if it does not get defined. */ | |
342ad2d6 | 6810 | SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node)); |
51ef3909 | 6811 | TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node); |
aca14577 | 6812 | TYPE_USER_ALIGN (ref) = 0; |
78a8ed03 | 6813 | TYPE_UNSIGNED (ref) = 1; |
51ef3909 | 6814 | TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node); |
6815 | TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node); | |
6816 | TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node); | |
6817 | } | |
6818 | ||
e60a6f7b | 6819 | pushtag (loc, name, ref); |
51ef3909 | 6820 | |
19702c1d | 6821 | ret.spec = ref; |
6822 | return ret; | |
6823 | } | |
6824 | ||
6825 | /* Get the struct, enum or union (CODE says which) with tag NAME. | |
6826 | Define the tag as a forward-reference if it is not defined. | |
6827 | Return a tree for the type. */ | |
6828 | ||
6829 | tree | |
6830 | xref_tag (enum tree_code code, tree name) | |
6831 | { | |
e60a6f7b | 6832 | return parser_xref_tag (input_location, code, name).spec; |
51ef3909 | 6833 | } |
6834 | \f | |
6e899616 | 6835 | /* Make sure that the tag NAME is defined *in the current scope* |
51ef3909 | 6836 | at least as a forward reference. |
e60a6f7b | 6837 | LOC is the location of the struct's definition. |
0b09525f | 6838 | CODE says which kind of tag NAME ought to be. |
6839 | ||
843bd2fa | 6840 | This stores the current value of the file static STRUCT_PARSE_INFO |
6841 | in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a | |
6842 | new c_struct_parse_info structure. The old value of | |
6843 | STRUCT_PARSE_INFO is restored in finish_struct. */ | |
51ef3909 | 6844 | |
6845 | tree | |
e60a6f7b | 6846 | start_struct (location_t loc, enum tree_code code, tree name, |
843bd2fa | 6847 | struct c_struct_parse_info **enclosing_struct_parse_info) |
51ef3909 | 6848 | { |
6e899616 | 6849 | /* If there is already a tag defined at this scope |
51ef3909 | 6850 | (as a forward reference), just return it. */ |
6851 | ||
0b09525f | 6852 | tree ref = NULL_TREE; |
6853 | location_t refloc = UNKNOWN_LOCATION; | |
51ef3909 | 6854 | |
0b09525f | 6855 | if (name != NULL_TREE) |
6856 | ref = lookup_tag (code, name, 1, &refloc); | |
51ef3909 | 6857 | if (ref && TREE_CODE (ref) == code) |
6858 | { | |
5dad28f1 | 6859 | if (TYPE_SIZE (ref)) |
a0c938f0 | 6860 | { |
1a5a5cd8 | 6861 | if (code == UNION_TYPE) |
0b09525f | 6862 | error_at (loc, "redefinition of %<union %E%>", name); |
a0c938f0 | 6863 | else |
0b09525f | 6864 | error_at (loc, "redefinition of %<struct %E%>", name); |
6865 | if (refloc != UNKNOWN_LOCATION) | |
6866 | inform (refloc, "originally defined here"); | |
fc92befb | 6867 | /* Don't create structures using a name already in use. */ |
6868 | ref = NULL_TREE; | |
1cae46be | 6869 | } |
5dad28f1 | 6870 | else if (C_TYPE_BEING_DEFINED (ref)) |
6871 | { | |
6872 | if (code == UNION_TYPE) | |
0b09525f | 6873 | error_at (loc, "nested redefinition of %<union %E%>", name); |
a0c938f0 | 6874 | else |
0b09525f | 6875 | error_at (loc, "nested redefinition of %<struct %E%>", name); |
6876 | /* Don't bother to report "originally defined here" for a | |
6877 | nested redefinition; the original definition should be | |
6878 | obvious. */ | |
c42cc79e | 6879 | /* Don't create structures that contain themselves. */ |
6880 | ref = NULL_TREE; | |
5dad28f1 | 6881 | } |
51ef3909 | 6882 | } |
6883 | ||
c42cc79e | 6884 | /* Otherwise create a forward-reference just so the tag is in scope. */ |
6885 | ||
6886 | if (ref == NULL_TREE || TREE_CODE (ref) != code) | |
6887 | { | |
67be5043 | 6888 | ref = make_node (code); |
e60a6f7b | 6889 | pushtag (loc, name, ref); |
67be5043 | 6890 | } |
1cae46be | 6891 | |
51ef3909 | 6892 | C_TYPE_BEING_DEFINED (ref) = 1; |
93aaccf8 | 6893 | TYPE_PACKED (ref) = flag_pack_struct; |
0b09525f | 6894 | |
843bd2fa | 6895 | *enclosing_struct_parse_info = struct_parse_info; |
6896 | struct_parse_info = XNEW (struct c_struct_parse_info); | |
f1f41a6c | 6897 | struct_parse_info->struct_types.create (0); |
6898 | struct_parse_info->fields.create (0); | |
6899 | struct_parse_info->typedefs_seen.create (0); | |
0b09525f | 6900 | |
6901 | /* FIXME: This will issue a warning for a use of a type defined | |
6902 | within a statement expr used within sizeof, et. al. This is not | |
6903 | terribly serious as C++ doesn't permit statement exprs within | |
6904 | sizeof anyhow. */ | |
6905 | if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof)) | |
6906 | warning_at (loc, OPT_Wc___compat, | |
6907 | "defining type in %qs expression is invalid in C++", | |
6908 | (in_sizeof | |
6909 | ? "sizeof" | |
6910 | : (in_typeof ? "typeof" : "alignof"))); | |
6911 | ||
51ef3909 | 6912 | return ref; |
6913 | } | |
6914 | ||
ac206aff | 6915 | /* Process the specs, declarator and width (NULL if omitted) |
51ef3909 | 6916 | of a structure component, returning a FIELD_DECL node. |
2d1a2840 | 6917 | WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node. |
e47ffaae | 6918 | DECL_ATTRS is as for grokdeclarator. |
51ef3909 | 6919 | |
d520c1f2 | 6920 | LOC is the location of the structure component. |
6921 | ||
51ef3909 | 6922 | This is done during the parsing of the struct declaration. |
6923 | The FIELD_DECL nodes are chained together and the lot of them | |
6924 | are ultimately passed to `build_struct' to make the RECORD_TYPE node. */ | |
6925 | ||
6926 | tree | |
d520c1f2 | 6927 | grokfield (location_t loc, |
6928 | struct c_declarator *declarator, struct c_declspecs *declspecs, | |
e47ffaae | 6929 | tree width, tree *decl_attrs) |
51ef3909 | 6930 | { |
6931 | tree value; | |
6932 | ||
ac206aff | 6933 | if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE |
6934 | && width == NULL_TREE) | |
7cb6c162 | 6935 | { |
07ebd091 | 6936 | /* This is an unnamed decl. |
6937 | ||
6938 | If we have something of the form "union { list } ;" then this | |
6939 | is the anonymous union extension. Similarly for struct. | |
6940 | ||
6941 | If this is something of the form "struct foo;", then | |
2fdec027 | 6942 | If MS or Plan 9 extensions are enabled, this is handled as |
6943 | an anonymous struct. | |
07ebd091 | 6944 | Otherwise this is a forward declaration of a structure tag. |
6945 | ||
6946 | If this is something of the form "foo;" and foo is a TYPE_DECL, then | |
afb3d3c4 | 6947 | If foo names a structure or union without a tag, then this |
32074525 | 6948 | is an anonymous struct (this is permitted by C11). |
2fdec027 | 6949 | If MS or Plan 9 extensions are enabled and foo names a |
6950 | structure, then again this is an anonymous struct. | |
07ebd091 | 6951 | Otherwise this is an error. |
6952 | ||
d716ce75 | 6953 | Oh what a horrid tangled web we weave. I wonder if MS consciously |
07ebd091 | 6954 | took this from Plan 9 or if it was an accident of implementation |
6955 | that took root before someone noticed the bug... */ | |
6956 | ||
9553111d | 6957 | tree type = declspecs->type; |
95ad7a71 | 6958 | bool type_ok = (TREE_CODE (type) == RECORD_TYPE |
6959 | || TREE_CODE (type) == UNION_TYPE); | |
6960 | bool ok = false; | |
188fc74c | 6961 | |
9b280b35 | 6962 | if (type_ok |
6963 | && (flag_ms_extensions | |
6964 | || flag_plan9_extensions | |
6965 | || !declspecs->typedef_p)) | |
07ebd091 | 6966 | { |
2fdec027 | 6967 | if (flag_ms_extensions || flag_plan9_extensions) |
95ad7a71 | 6968 | ok = true; |
9b280b35 | 6969 | else if (TYPE_NAME (type) == NULL) |
95ad7a71 | 6970 | ok = true; |
07ebd091 | 6971 | else |
95ad7a71 | 6972 | ok = false; |
07ebd091 | 6973 | } |
95ad7a71 | 6974 | if (!ok) |
7cb6c162 | 6975 | { |
d520c1f2 | 6976 | pedwarn (loc, 0, "declaration does not declare anything"); |
7cb6c162 | 6977 | return NULL_TREE; |
6978 | } | |
508ea33a | 6979 | if (flag_isoc99) |
6980 | pedwarn_c99 (loc, OPT_Wpedantic, | |
afb3d3c4 | 6981 | "ISO C99 doesn%'t support unnamed structs/unions"); |
508ea33a | 6982 | else |
6983 | pedwarn_c99 (loc, OPT_Wpedantic, | |
afb3d3c4 | 6984 | "ISO C90 doesn%'t support unnamed structs/unions"); |
7cb6c162 | 6985 | } |
6986 | ||
4a125bfc | 6987 | value = grokdeclarator (declarator, declspecs, FIELD, false, |
a75b1c71 | 6988 | width ? &width : NULL, decl_attrs, NULL, NULL, |
e47ffaae | 6989 | DEPRECATED_NORMAL); |
51ef3909 | 6990 | |
e60a6f7b | 6991 | finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE); |
b9d8dcc9 | 6992 | DECL_INITIAL (value) = width; |
51ef3909 | 6993 | |
843bd2fa | 6994 | if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE) |
6995 | { | |
6996 | /* If we currently have a binding for this field, set the | |
6997 | in_struct field in the binding, so that we warn about lookups | |
6998 | which find it. */ | |
6999 | struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value)); | |
7000 | if (b != NULL) | |
7001 | { | |
7002 | /* If the in_struct field is not yet set, push it on a list | |
7003 | to be cleared when this struct is finished. */ | |
7004 | if (!b->in_struct) | |
7005 | { | |
f1f41a6c | 7006 | struct_parse_info->fields.safe_push (b); |
843bd2fa | 7007 | b->in_struct = 1; |
7008 | } | |
7009 | } | |
7010 | } | |
7011 | ||
51ef3909 | 7012 | return value; |
7013 | } | |
7014 | \f | |
2fdec027 | 7015 | /* Subroutine of detect_field_duplicates: return whether X and Y, |
7016 | which are both fields in the same struct, have duplicate field | |
7017 | names. */ | |
7018 | ||
7019 | static bool | |
7020 | is_duplicate_field (tree x, tree y) | |
7021 | { | |
7022 | if (DECL_NAME (x) != NULL_TREE && DECL_NAME (x) == DECL_NAME (y)) | |
7023 | return true; | |
7024 | ||
7025 | /* When using -fplan9-extensions, an anonymous field whose name is a | |
7026 | typedef can duplicate a field name. */ | |
7027 | if (flag_plan9_extensions | |
7028 | && (DECL_NAME (x) == NULL_TREE || DECL_NAME (y) == NULL_TREE)) | |
7029 | { | |
7030 | tree xt, xn, yt, yn; | |
7031 | ||
7032 | xt = TREE_TYPE (x); | |
7033 | if (DECL_NAME (x) != NULL_TREE) | |
7034 | xn = DECL_NAME (x); | |
7035 | else if ((TREE_CODE (xt) == RECORD_TYPE || TREE_CODE (xt) == UNION_TYPE) | |
7036 | && TYPE_NAME (xt) != NULL_TREE | |
7037 | && TREE_CODE (TYPE_NAME (xt)) == TYPE_DECL) | |
7038 | xn = DECL_NAME (TYPE_NAME (xt)); | |
7039 | else | |
7040 | xn = NULL_TREE; | |
7041 | ||
7042 | yt = TREE_TYPE (y); | |
7043 | if (DECL_NAME (y) != NULL_TREE) | |
7044 | yn = DECL_NAME (y); | |
7045 | else if ((TREE_CODE (yt) == RECORD_TYPE || TREE_CODE (yt) == UNION_TYPE) | |
7046 | && TYPE_NAME (yt) != NULL_TREE | |
7047 | && TREE_CODE (TYPE_NAME (yt)) == TYPE_DECL) | |
7048 | yn = DECL_NAME (TYPE_NAME (yt)); | |
7049 | else | |
7050 | yn = NULL_TREE; | |
7051 | ||
7052 | if (xn != NULL_TREE && xn == yn) | |
7053 | return true; | |
7054 | } | |
7055 | ||
7056 | return false; | |
7057 | } | |
7058 | ||
8af5341f | 7059 | /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST |
7060 | to HTAB, giving errors for any duplicates. */ | |
7061 | ||
7062 | static void | |
d1455aa3 | 7063 | detect_field_duplicates_hash (tree fieldlist, |
c1f445d2 | 7064 | hash_table<pointer_hash <tree_node> > *htab) |
8af5341f | 7065 | { |
7066 | tree x, y; | |
d1455aa3 | 7067 | tree_node **slot; |
8af5341f | 7068 | |
1767a056 | 7069 | for (x = fieldlist; x ; x = DECL_CHAIN (x)) |
8af5341f | 7070 | if ((y = DECL_NAME (x)) != 0) |
7071 | { | |
c1f445d2 | 7072 | slot = htab->find_slot (y, INSERT); |
8af5341f | 7073 | if (*slot) |
7074 | { | |
7075 | error ("duplicate member %q+D", x); | |
7076 | DECL_NAME (x) = NULL_TREE; | |
7077 | } | |
7078 | *slot = y; | |
7079 | } | |
7080 | else if (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE | |
7081 | || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE) | |
2fdec027 | 7082 | { |
7083 | detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x)), htab); | |
7084 | ||
7085 | /* When using -fplan9-extensions, an anonymous field whose | |
7086 | name is a typedef can duplicate a field name. */ | |
7087 | if (flag_plan9_extensions | |
7088 | && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE | |
7089 | && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL) | |
7090 | { | |
7091 | tree xn = DECL_NAME (TYPE_NAME (TREE_TYPE (x))); | |
c1f445d2 | 7092 | slot = htab->find_slot (xn, INSERT); |
2fdec027 | 7093 | if (*slot) |
7094 | error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x))); | |
7095 | *slot = xn; | |
7096 | } | |
7097 | } | |
8af5341f | 7098 | } |
7099 | ||
4d2aa485 | 7100 | /* Generate an error for any duplicate field names in FIELDLIST. Munge |
7101 | the list such that this does not present a problem later. */ | |
7102 | ||
7103 | static void | |
7104 | detect_field_duplicates (tree fieldlist) | |
7105 | { | |
7106 | tree x, y; | |
7107 | int timeout = 10; | |
7108 | ||
e93ea189 | 7109 | /* If the struct is the list of instance variables of an Objective-C |
394dd737 | 7110 | class, then we need to check all the instance variables of |
7111 | superclasses when checking for duplicates (since you can't have | |
e93ea189 | 7112 | an instance variable in a subclass with the same name as an |
394dd737 | 7113 | instance variable in a superclass). We pass on this job to the |
7114 | Objective-C compiler. objc_detect_field_duplicates() will return | |
7115 | false if we are not checking the list of instance variables and | |
7116 | the C frontend should proceed with the standard field duplicate | |
7117 | checks. If we are checking the list of instance variables, the | |
7118 | ObjC frontend will do the check, emit the errors if needed, and | |
7119 | then return true. */ | |
e93ea189 | 7120 | if (c_dialect_objc ()) |
394dd737 | 7121 | if (objc_detect_field_duplicates (false)) |
7122 | return; | |
e93ea189 | 7123 | |
4d2aa485 | 7124 | /* First, see if there are more than "a few" fields. |
7125 | This is trivially true if there are zero or one fields. */ | |
4f4d5f36 | 7126 | if (!fieldlist || !DECL_CHAIN (fieldlist)) |
4d2aa485 | 7127 | return; |
4f4d5f36 | 7128 | x = fieldlist; |
4d2aa485 | 7129 | do { |
7130 | timeout--; | |
8af5341f | 7131 | if (DECL_NAME (x) == NULL_TREE |
7132 | && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE | |
7133 | || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)) | |
7134 | timeout = 0; | |
1767a056 | 7135 | x = DECL_CHAIN (x); |
4d2aa485 | 7136 | } while (timeout > 0 && x); |
7137 | ||
8af5341f | 7138 | /* If there were "few" fields and no anonymous structures or unions, |
7139 | avoid the overhead of allocating a hash table. Instead just do | |
7140 | the nested traversal thing. */ | |
4d2aa485 | 7141 | if (timeout > 0) |
7142 | { | |
d059ef79 | 7143 | for (x = DECL_CHAIN (fieldlist); x; x = DECL_CHAIN (x)) |
2fdec027 | 7144 | /* When using -fplan9-extensions, we can have duplicates |
7145 | between typedef names and fields. */ | |
7146 | if (DECL_NAME (x) | |
7147 | || (flag_plan9_extensions | |
7148 | && DECL_NAME (x) == NULL_TREE | |
7149 | && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE | |
7150 | || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE) | |
7151 | && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE | |
7152 | && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL)) | |
4d2aa485 | 7153 | { |
7154 | for (y = fieldlist; y != x; y = TREE_CHAIN (y)) | |
2fdec027 | 7155 | if (is_duplicate_field (y, x)) |
4d2aa485 | 7156 | { |
3cf8b391 | 7157 | error ("duplicate member %q+D", x); |
4d2aa485 | 7158 | DECL_NAME (x) = NULL_TREE; |
7159 | } | |
7160 | } | |
7161 | } | |
7162 | else | |
7163 | { | |
c1f445d2 | 7164 | hash_table<pointer_hash <tree_node> > htab (37); |
7165 | detect_field_duplicates_hash (fieldlist, &htab); | |
4d2aa485 | 7166 | } |
7167 | } | |
7168 | ||
843bd2fa | 7169 | /* Finish up struct info used by -Wc++-compat. */ |
7170 | ||
7171 | static void | |
7172 | warn_cxx_compat_finish_struct (tree fieldlist) | |
7173 | { | |
7174 | unsigned int ix; | |
7175 | tree x; | |
7176 | struct c_binding *b; | |
7177 | ||
7178 | /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in | |
7179 | the current struct. We do this now at the end of the struct | |
7180 | because the flag is used to issue visibility warnings, and we | |
7181 | only want to issue those warnings if the type is referenced | |
7182 | outside of the struct declaration. */ | |
f1f41a6c | 7183 | FOR_EACH_VEC_ELT (struct_parse_info->struct_types, ix, x) |
843bd2fa | 7184 | C_TYPE_DEFINED_IN_STRUCT (x) = 1; |
7185 | ||
7186 | /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of | |
7187 | typedefs used when declaring fields in this struct. If the name | |
7188 | of any of the fields is also a typedef name then the struct would | |
7189 | not parse in C++, because the C++ lookup rules say that the | |
7190 | typedef name would be looked up in the context of the struct, and | |
7191 | would thus be the field rather than the typedef. */ | |
f1f41a6c | 7192 | if (!struct_parse_info->typedefs_seen.is_empty () |
843bd2fa | 7193 | && fieldlist != NULL_TREE) |
7194 | { | |
431205b7 | 7195 | /* Use a hash_set<tree> using the name of the typedef. We can use |
7196 | a hash_set<tree> because identifiers are interned. */ | |
7197 | hash_set<tree> tset; | |
843bd2fa | 7198 | |
f1f41a6c | 7199 | FOR_EACH_VEC_ELT (struct_parse_info->typedefs_seen, ix, x) |
431205b7 | 7200 | tset.add (DECL_NAME (x)); |
843bd2fa | 7201 | |
1767a056 | 7202 | for (x = fieldlist; x != NULL_TREE; x = DECL_CHAIN (x)) |
843bd2fa | 7203 | { |
56712363 | 7204 | if (DECL_NAME (x) != NULL_TREE |
431205b7 | 7205 | && tset.contains (DECL_NAME (x))) |
843bd2fa | 7206 | { |
7207 | warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat, | |
7208 | ("using %qD as both field and typedef name is " | |
7209 | "invalid in C++"), | |
7210 | x); | |
7211 | /* FIXME: It would be nice to report the location where | |
7212 | the typedef name is used. */ | |
7213 | } | |
7214 | } | |
843bd2fa | 7215 | } |
7216 | ||
7217 | /* For each field which has a binding and which was not defined in | |
7218 | an enclosing struct, clear the in_struct field. */ | |
f1f41a6c | 7219 | FOR_EACH_VEC_ELT (struct_parse_info->fields, ix, b) |
843bd2fa | 7220 | b->in_struct = 0; |
7221 | } | |
7222 | ||
51ef3909 | 7223 | /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T. |
e60a6f7b | 7224 | LOC is the location of the RECORD_TYPE or UNION_TYPE's definition. |
9c316e51 | 7225 | FIELDLIST is a chain of FIELD_DECL nodes for the fields. |
0b09525f | 7226 | ATTRIBUTES are attributes to be applied to the structure. |
7227 | ||
843bd2fa | 7228 | ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when |
7229 | the struct was started. */ | |
51ef3909 | 7230 | |
7231 | tree | |
e60a6f7b | 7232 | finish_struct (location_t loc, tree t, tree fieldlist, tree attributes, |
843bd2fa | 7233 | struct c_struct_parse_info *enclosing_struct_parse_info) |
51ef3909 | 7234 | { |
19cb6b50 | 7235 | tree x; |
393b349a | 7236 | bool toplevel = file_scope == current_scope; |
21c8999d | 7237 | int saw_named_field; |
51ef3909 | 7238 | |
7239 | /* If this type was previously laid out as a forward reference, | |
7240 | make sure we lay it out again. */ | |
7241 | ||
7242 | TYPE_SIZE (t) = 0; | |
7243 | ||
e3c541f0 | 7244 | decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); |
92b4910b | 7245 | |
328469d8 | 7246 | if (pedantic) |
7247 | { | |
1767a056 | 7248 | for (x = fieldlist; x; x = DECL_CHAIN (x)) |
afb3d3c4 | 7249 | { |
7250 | if (DECL_NAME (x) != 0) | |
7251 | break; | |
32074525 | 7252 | if (flag_isoc11 |
afb3d3c4 | 7253 | && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE |
7254 | || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)) | |
7255 | break; | |
7256 | } | |
328469d8 | 7257 | |
7258 | if (x == 0) | |
4ed53d3d | 7259 | { |
7260 | if (TREE_CODE (t) == UNION_TYPE) | |
7261 | { | |
7262 | if (fieldlist) | |
29438999 | 7263 | pedwarn (loc, OPT_Wpedantic, "union has no named members"); |
4ed53d3d | 7264 | else |
29438999 | 7265 | pedwarn (loc, OPT_Wpedantic, "union has no members"); |
4ed53d3d | 7266 | } |
7267 | else | |
7268 | { | |
7269 | if (fieldlist) | |
29438999 | 7270 | pedwarn (loc, OPT_Wpedantic, "struct has no named members"); |
4ed53d3d | 7271 | else |
29438999 | 7272 | pedwarn (loc, OPT_Wpedantic, "struct has no members"); |
4ed53d3d | 7273 | } |
7274 | } | |
328469d8 | 7275 | } |
51ef3909 | 7276 | |
b9d8dcc9 | 7277 | /* Install struct as DECL_CONTEXT of each field decl. |
4f7f7efd | 7278 | Also process specified field sizes, found in the DECL_INITIAL, |
7279 | storing 0 there after the type has been changed to precision equal | |
7280 | to its width, rather than the precision of the specified standard | |
7281 | type. (Correct layout requires the original type to have been preserved | |
7282 | until now.) */ | |
51ef3909 | 7283 | |
21c8999d | 7284 | saw_named_field = 0; |
1767a056 | 7285 | for (x = fieldlist; x; x = DECL_CHAIN (x)) |
51ef3909 | 7286 | { |
b4b63acb | 7287 | if (TREE_TYPE (x) == error_mark_node) |
7288 | continue; | |
7289 | ||
51ef3909 | 7290 | DECL_CONTEXT (x) = t; |
c2ab04f9 | 7291 | |
51ef3909 | 7292 | /* If any field is const, the structure type is pseudo-const. */ |
7293 | if (TREE_READONLY (x)) | |
7294 | C_TYPE_FIELDS_READONLY (t) = 1; | |
7295 | else | |
7296 | { | |
7297 | /* A field that is pseudo-const makes the structure likewise. */ | |
980b024a | 7298 | tree t1 = strip_array_types (TREE_TYPE (x)); |
51ef3909 | 7299 | if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE) |
7300 | && C_TYPE_FIELDS_READONLY (t1)) | |
7301 | C_TYPE_FIELDS_READONLY (t) = 1; | |
7302 | } | |
7303 | ||
7304 | /* Any field that is volatile means variables of this type must be | |
7305 | treated in some ways as volatile. */ | |
7306 | if (TREE_THIS_VOLATILE (x)) | |
7307 | C_TYPE_FIELDS_VOLATILE (t) = 1; | |
7308 | ||
7309 | /* Any field of nominal variable size implies structure is too. */ | |
7310 | if (C_DECL_VARIABLE_SIZE (x)) | |
7311 | C_TYPE_VARIABLE_SIZE (t) = 1; | |
7312 | ||
b9d8dcc9 | 7313 | if (DECL_INITIAL (x)) |
7314 | { | |
e913b5cd | 7315 | unsigned HOST_WIDE_INT width = tree_to_uhwi (DECL_INITIAL (x)); |
2d1a2840 | 7316 | DECL_SIZE (x) = bitsize_int (width); |
7317 | DECL_BIT_FIELD (x) = 1; | |
7318 | SET_DECL_C_BIT_FIELD (x); | |
b9d8dcc9 | 7319 | } |
7320 | ||
9fd767c5 | 7321 | if (TYPE_PACKED (t) |
7322 | && (DECL_BIT_FIELD (x) | |
7323 | || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT)) | |
7324 | DECL_PACKED (x) = 1; | |
7325 | ||
21c8999d | 7326 | /* Detect flexible array member in an invalid context. */ |
7327 | if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE | |
7328 | && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE | |
7329 | && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE | |
7330 | && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE) | |
7331 | { | |
7332 | if (TREE_CODE (t) == UNION_TYPE) | |
206d8357 | 7333 | { |
e60a6f7b | 7334 | error_at (DECL_SOURCE_LOCATION (x), |
712d2297 | 7335 | "flexible array member in union"); |
206d8357 | 7336 | TREE_TYPE (x) = error_mark_node; |
7337 | } | |
1767a056 | 7338 | else if (DECL_CHAIN (x) != NULL_TREE) |
206d8357 | 7339 | { |
e60a6f7b | 7340 | error_at (DECL_SOURCE_LOCATION (x), |
712d2297 | 7341 | "flexible array member not at end of struct"); |
206d8357 | 7342 | TREE_TYPE (x) = error_mark_node; |
7343 | } | |
84166705 | 7344 | else if (!saw_named_field) |
206d8357 | 7345 | { |
e60a6f7b | 7346 | error_at (DECL_SOURCE_LOCATION (x), |
712d2297 | 7347 | "flexible array member in otherwise empty struct"); |
206d8357 | 7348 | TREE_TYPE (x) = error_mark_node; |
7349 | } | |
21c8999d | 7350 | } |
ce09bc13 | 7351 | |
712d2297 | 7352 | if (pedantic && TREE_CODE (t) == RECORD_TYPE |
ce09bc13 | 7353 | && flexible_array_type_p (TREE_TYPE (x))) |
29438999 | 7354 | pedwarn (DECL_SOURCE_LOCATION (x), OPT_Wpedantic, |
712d2297 | 7355 | "invalid use of structure with flexible array member"); |
ce09bc13 | 7356 | |
afb3d3c4 | 7357 | if (DECL_NAME (x) |
7358 | || TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE | |
7359 | || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE) | |
21c8999d | 7360 | saw_named_field = 1; |
a0c2c45b | 7361 | } |
51ef3909 | 7362 | |
4d2aa485 | 7363 | detect_field_duplicates (fieldlist); |
51ef3909 | 7364 | |
7365 | /* Now we have the nearly final fieldlist. Record it, | |
7366 | then lay out the structure or union (including the fields). */ | |
7367 | ||
7368 | TYPE_FIELDS (t) = fieldlist; | |
7369 | ||
7370 | layout_type (t); | |
7371 | ||
76bbe4ca | 7372 | if (TYPE_SIZE_UNIT (t) |
7373 | && TREE_CODE (TYPE_SIZE_UNIT (t)) == INTEGER_CST | |
7374 | && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t)) | |
7375 | && !valid_constant_size_p (TYPE_SIZE_UNIT (t))) | |
7376 | error ("type %qT is too large", t); | |
7377 | ||
4f7f7efd | 7378 | /* Give bit-fields their proper types. */ |
813a136d | 7379 | { |
7380 | tree *fieldlistp = &fieldlist; | |
d4d302bd | 7381 | while (*fieldlistp) |
4f7f7efd | 7382 | if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp) |
7383 | && TREE_TYPE (*fieldlistp) != error_mark_node) | |
7384 | { | |
7385 | unsigned HOST_WIDE_INT width | |
e913b5cd | 7386 | = tree_to_uhwi (DECL_INITIAL (*fieldlistp)); |
4f7f7efd | 7387 | tree type = TREE_TYPE (*fieldlistp); |
7388 | if (width != TYPE_PRECISION (type)) | |
24bdc387 | 7389 | { |
7390 | TREE_TYPE (*fieldlistp) | |
2ac1e110 | 7391 | = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type)); |
24bdc387 | 7392 | DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp)); |
7393 | } | |
4f7f7efd | 7394 | DECL_INITIAL (*fieldlistp) = 0; |
7395 | } | |
813a136d | 7396 | else |
1767a056 | 7397 | fieldlistp = &DECL_CHAIN (*fieldlistp); |
813a136d | 7398 | } |
51ef3909 | 7399 | |
21c8999d | 7400 | /* Now we have the truly final field list. |
7401 | Store it in this type and in the variants. */ | |
51ef3909 | 7402 | |
7403 | TYPE_FIELDS (t) = fieldlist; | |
7404 | ||
860251be | 7405 | /* If there are lots of fields, sort so we can look through them fast. |
8b332087 | 7406 | We arbitrarily consider 16 or more elts to be "a lot". */ |
860251be | 7407 | |
7408 | { | |
7409 | int len = 0; | |
7410 | ||
1767a056 | 7411 | for (x = fieldlist; x; x = DECL_CHAIN (x)) |
860251be | 7412 | { |
a0c938f0 | 7413 | if (len > 15 || DECL_NAME (x) == NULL) |
7414 | break; | |
7415 | len += 1; | |
860251be | 7416 | } |
7417 | ||
7418 | if (len > 15) | |
7419 | { | |
a0c938f0 | 7420 | tree *field_array; |
7421 | struct lang_type *space; | |
7422 | struct sorted_fields_type *space2; | |
d9cf68bf | 7423 | |
a0c938f0 | 7424 | len += list_length (x); |
d9cf68bf | 7425 | |
a0c938f0 | 7426 | /* Use the same allocation policy here that make_node uses, to |
7427 | ensure that this lives as long as the rest of the struct decl. | |
7428 | All decls in an inline function need to be saved. */ | |
d9cf68bf | 7429 | |
25a27413 | 7430 | space = ggc_cleared_alloc<struct lang_type> (); |
7431 | space2 = (sorted_fields_type *) ggc_internal_alloc | |
ba72912a | 7432 | (sizeof (struct sorted_fields_type) + len * sizeof (tree)); |
d9cf68bf | 7433 | |
a0c938f0 | 7434 | len = 0; |
860251be | 7435 | space->s = space2; |
7436 | field_array = &space2->elts[0]; | |
1767a056 | 7437 | for (x = fieldlist; x; x = DECL_CHAIN (x)) |
a0c938f0 | 7438 | { |
7439 | field_array[len++] = x; | |
7440 | ||
7441 | /* If there is anonymous struct or union, break out of the loop. */ | |
7442 | if (DECL_NAME (x) == NULL) | |
7443 | break; | |
7444 | } | |
7445 | /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */ | |
7446 | if (x == NULL) | |
7447 | { | |
7448 | TYPE_LANG_SPECIFIC (t) = space; | |
7449 | TYPE_LANG_SPECIFIC (t)->s->len = len; | |
7450 | field_array = TYPE_LANG_SPECIFIC (t)->s->elts; | |
7451 | qsort (field_array, len, sizeof (tree), field_decl_cmp); | |
7452 | } | |
860251be | 7453 | } |
7454 | } | |
d9cf68bf | 7455 | |
51ef3909 | 7456 | for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x)) |
7457 | { | |
7458 | TYPE_FIELDS (x) = TYPE_FIELDS (t); | |
7459 | TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t); | |
d8828f55 | 7460 | C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t); |
7461 | C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t); | |
7462 | C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t); | |
51ef3909 | 7463 | } |
7464 | ||
1b170db1 | 7465 | /* If this was supposed to be a transparent union, but we can't |
7466 | make it one, warn and turn off the flag. */ | |
7467 | if (TREE_CODE (t) == UNION_TYPE | |
8df5a43d | 7468 | && TYPE_TRANSPARENT_AGGR (t) |
89dec201 | 7469 | && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))) |
1b170db1 | 7470 | { |
8df5a43d | 7471 | TYPE_TRANSPARENT_AGGR (t) = 0; |
e60a6f7b | 7472 | warning_at (loc, 0, "union cannot be made transparent"); |
1b170db1 | 7473 | } |
7474 | ||
51ef3909 | 7475 | /* If this structure or union completes the type of any previous |
7476 | variable declaration, lay it out and output its rtl. */ | |
3e0a85c2 | 7477 | for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)); |
7478 | x; | |
7479 | x = TREE_CHAIN (x)) | |
51ef3909 | 7480 | { |
3e0a85c2 | 7481 | tree decl = TREE_VALUE (x); |
7482 | if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE) | |
7483 | layout_array_type (TREE_TYPE (decl)); | |
7484 | if (TREE_CODE (decl) != TYPE_DECL) | |
7485 | { | |
7486 | layout_decl (decl, 0); | |
7487 | if (c_dialect_objc ()) | |
7488 | objc_check_decl (decl); | |
b2c4af5e | 7489 | rest_of_decl_compilation (decl, toplevel, 0); |
51ef3909 | 7490 | } |
7491 | } | |
3e0a85c2 | 7492 | C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0; |
51ef3909 | 7493 | |
6e0982ac | 7494 | /* Update type location to the one of the definition, instead of e.g. |
7495 | a forward declaration. */ | |
7496 | if (TYPE_STUB_DECL (t)) | |
7497 | DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc; | |
7498 | ||
51ef3909 | 7499 | /* Finish debugging output for this type. */ |
7500 | rest_of_type_compilation (t, toplevel); | |
7501 | ||
e5f813af | 7502 | /* If we're inside a function proper, i.e. not file-scope and not still |
7503 | parsing parameters, then arrange for the size of a variable sized type | |
7504 | to be bound now. */ | |
cacfdc02 | 7505 | if (building_stmt_list_p () && variably_modified_type_p (t, NULL_TREE)) |
e60a6f7b | 7506 | add_stmt (build_stmt (loc, |
7507 | DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t))); | |
e5f813af | 7508 | |
843bd2fa | 7509 | if (warn_cxx_compat) |
7510 | warn_cxx_compat_finish_struct (fieldlist); | |
0b09525f | 7511 | |
f1f41a6c | 7512 | struct_parse_info->struct_types.release (); |
7513 | struct_parse_info->fields.release (); | |
7514 | struct_parse_info->typedefs_seen.release (); | |
843bd2fa | 7515 | XDELETE (struct_parse_info); |
0b09525f | 7516 | |
843bd2fa | 7517 | struct_parse_info = enclosing_struct_parse_info; |
0b09525f | 7518 | |
7519 | /* If this struct is defined inside a struct, add it to | |
843bd2fa | 7520 | struct_types. */ |
7521 | if (warn_cxx_compat | |
7522 | && struct_parse_info != NULL | |
7523 | && !in_sizeof && !in_typeof && !in_alignof) | |
f1f41a6c | 7524 | struct_parse_info->struct_types.safe_push (t); |
0b09525f | 7525 | |
51ef3909 | 7526 | return t; |
7527 | } | |
7528 | ||
7529 | /* Lay out the type T, and its element type, and so on. */ | |
7530 | ||
7531 | static void | |
1cae46be | 7532 | layout_array_type (tree t) |
51ef3909 | 7533 | { |
7534 | if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE) | |
7535 | layout_array_type (TREE_TYPE (t)); | |
7536 | layout_type (t); | |
7537 | } | |
7538 | \f | |
7539 | /* Begin compiling the definition of an enumeration type. | |
7540 | NAME is its name (or null if anonymous). | |
e60a6f7b | 7541 | LOC is the enum's location. |
51ef3909 | 7542 | Returns the type object, as yet incomplete. |
7543 | Also records info about it so that build_enumerator | |
7544 | may be used to declare the individual values as they are read. */ | |
7545 | ||
7546 | tree | |
e60a6f7b | 7547 | start_enum (location_t loc, struct c_enum_contents *the_enum, tree name) |
51ef3909 | 7548 | { |
0b09525f | 7549 | tree enumtype = NULL_TREE; |
7550 | location_t enumloc = UNKNOWN_LOCATION; | |
51ef3909 | 7551 | |
7552 | /* If this is the real definition for a previous forward reference, | |
7553 | fill in the contents in the same object that used to be the | |
7554 | forward reference. */ | |
7555 | ||
0b09525f | 7556 | if (name != NULL_TREE) |
7557 | enumtype = lookup_tag (ENUMERAL_TYPE, name, 1, &enumloc); | |
51ef3909 | 7558 | |
7559 | if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE) | |
7560 | { | |
7561 | enumtype = make_node (ENUMERAL_TYPE); | |
e60a6f7b | 7562 | pushtag (loc, name, enumtype); |
51ef3909 | 7563 | } |
7564 | ||
5dad28f1 | 7565 | if (C_TYPE_BEING_DEFINED (enumtype)) |
0b09525f | 7566 | error_at (loc, "nested redefinition of %<enum %E%>", name); |
5dad28f1 | 7567 | |
51ef3909 | 7568 | C_TYPE_BEING_DEFINED (enumtype) = 1; |
7569 | ||
7570 | if (TYPE_VALUES (enumtype) != 0) | |
7571 | { | |
7572 | /* This enum is a named one that has been declared already. */ | |
0b09525f | 7573 | error_at (loc, "redeclaration of %<enum %E%>", name); |
7574 | if (enumloc != UNKNOWN_LOCATION) | |
7575 | inform (enumloc, "originally defined here"); | |
51ef3909 | 7576 | |
7577 | /* Completely replace its old definition. | |
7578 | The old enumerators remain defined, however. */ | |
7579 | TYPE_VALUES (enumtype) = 0; | |
7580 | } | |
7581 | ||
13c7079e | 7582 | the_enum->enum_next_value = integer_zero_node; |
7583 | the_enum->enum_overflow = 0; | |
51ef3909 | 7584 | |
93aaccf8 | 7585 | if (flag_short_enums) |
7586 | TYPE_PACKED (enumtype) = 1; | |
7587 | ||
0b09525f | 7588 | /* FIXME: This will issue a warning for a use of a type defined |
7589 | within sizeof in a statement expr. This is not terribly serious | |
7590 | as C++ doesn't permit statement exprs within sizeof anyhow. */ | |
7591 | if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof)) | |
7592 | warning_at (loc, OPT_Wc___compat, | |
7593 | "defining type in %qs expression is invalid in C++", | |
7594 | (in_sizeof | |
7595 | ? "sizeof" | |
7596 | : (in_typeof ? "typeof" : "alignof"))); | |
7597 | ||
51ef3909 | 7598 | return enumtype; |
7599 | } | |
7600 | ||
7601 | /* After processing and defining all the values of an enumeration type, | |
7602 | install their decls in the enumeration type and finish it off. | |
92b4910b | 7603 | ENUMTYPE is the type object, VALUES a list of decl-value pairs, |
7604 | and ATTRIBUTES are the specified attributes. | |
51ef3909 | 7605 | Returns ENUMTYPE. */ |
7606 | ||
7607 | tree | |
1cae46be | 7608 | finish_enum (tree enumtype, tree values, tree attributes) |
51ef3909 | 7609 | { |
19cb6b50 | 7610 | tree pair, tem; |
4ee9c684 | 7611 | tree minnode = 0, maxnode = 0; |
ddb1be65 | 7612 | int precision; |
e913b5cd | 7613 | signop sign; |
393b349a | 7614 | bool toplevel = (file_scope == current_scope); |
4ee9c684 | 7615 | struct lang_type *lt; |
51ef3909 | 7616 | |
e3c541f0 | 7617 | decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); |
92b4910b | 7618 | |
51ef3909 | 7619 | /* Calculate the maximum value of any enumerator in this type. */ |
7620 | ||
cbf39c1f | 7621 | if (values == error_mark_node) |
7622 | minnode = maxnode = integer_zero_node; | |
7623 | else | |
8b2f77e7 | 7624 | { |
dcf6eb8b | 7625 | minnode = maxnode = TREE_VALUE (values); |
7626 | for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair)) | |
8b2f77e7 | 7627 | { |
dcf6eb8b | 7628 | tree value = TREE_VALUE (pair); |
7629 | if (tree_int_cst_lt (maxnode, value)) | |
7630 | maxnode = value; | |
7631 | if (tree_int_cst_lt (value, minnode)) | |
7632 | minnode = value; | |
8b2f77e7 | 7633 | } |
dcf6eb8b | 7634 | } |
8b2f77e7 | 7635 | |
dcf6eb8b | 7636 | /* Construct the final type of this enumeration. It is the same |
7637 | as one of the integral types - the narrowest one that fits, except | |
7638 | that normally we only go as narrow as int - and signed iff any of | |
7639 | the values are negative. */ | |
e913b5cd | 7640 | sign = (tree_int_cst_sgn (minnode) >= 0) ? UNSIGNED : SIGNED; |
7641 | precision = MAX (tree_int_cst_min_precision (minnode, sign), | |
7642 | tree_int_cst_min_precision (maxnode, sign)); | |
3a648ab9 | 7643 | |
f219fbbf | 7644 | if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node)) |
dcf6eb8b | 7645 | { |
e913b5cd | 7646 | tem = c_common_type_for_size (precision, sign == UNSIGNED ? 1 : 0); |
4ee9c684 | 7647 | if (tem == NULL) |
f219fbbf | 7648 | { |
c3ceba8e | 7649 | warning (0, "enumeration values exceed range of largest integer"); |
4ee9c684 | 7650 | tem = long_long_integer_type_node; |
f219fbbf | 7651 | } |
8b2f77e7 | 7652 | } |
f219fbbf | 7653 | else |
e913b5cd | 7654 | tem = sign == UNSIGNED ? unsigned_type_node : integer_type_node; |
c1838b2a | 7655 | |
4ee9c684 | 7656 | TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem); |
7657 | TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem); | |
4ee9c684 | 7658 | TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem); |
51ef3909 | 7659 | TYPE_SIZE (enumtype) = 0; |
3a648ab9 | 7660 | |
7661 | /* If the precision of the type was specific with an attribute and it | |
7662 | was too small, give an error. Otherwise, use it. */ | |
7663 | if (TYPE_PRECISION (enumtype)) | |
7664 | { | |
7665 | if (precision > TYPE_PRECISION (enumtype)) | |
7666 | error ("specified mode too small for enumeral values"); | |
7667 | } | |
7668 | else | |
7669 | TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem); | |
7670 | ||
51ef3909 | 7671 | layout_type (enumtype); |
7672 | ||
cbf39c1f | 7673 | if (values != error_mark_node) |
a7925e0c | 7674 | { |
dcf6eb8b | 7675 | /* Change the type of the enumerators to be the enum type. We |
7676 | need to do this irrespective of the size of the enum, for | |
7677 | proper type checking. Replace the DECL_INITIALs of the | |
7678 | enumerators, and the value slots of the list, with copies | |
7679 | that have the enum type; they cannot be modified in place | |
7680 | because they may be shared (e.g. integer_zero_node) Finally, | |
7681 | change the purpose slots to point to the names of the decls. */ | |
cbf39c1f | 7682 | for (pair = values; pair; pair = TREE_CHAIN (pair)) |
7683 | { | |
dcf6eb8b | 7684 | tree enu = TREE_PURPOSE (pair); |
4ee9c684 | 7685 | tree ini = DECL_INITIAL (enu); |
51ef3909 | 7686 | |
dcf6eb8b | 7687 | TREE_TYPE (enu) = enumtype; |
c1838b2a | 7688 | |
7689 | /* The ISO C Standard mandates enumerators to have type int, | |
7690 | even though the underlying type of an enum type is | |
e8fc0d34 | 7691 | unspecified. However, GCC allows enumerators of any |
9fe4fa50 | 7692 | integer type as an extensions. build_enumerator() |
7693 | converts any enumerators that fit in an int to type int, | |
7694 | to avoid promotions to unsigned types when comparing | |
7695 | integers with enumerators that fit in the int range. | |
7696 | When -pedantic is given, build_enumerator() would have | |
7697 | already warned about those that don't fit. Here we | |
7698 | convert the rest to the enumerator type. */ | |
7699 | if (TREE_TYPE (ini) != integer_type_node) | |
7700 | ini = convert (enumtype, ini); | |
dcf6eb8b | 7701 | |
4ee9c684 | 7702 | DECL_INITIAL (enu) = ini; |
dcf6eb8b | 7703 | TREE_PURPOSE (pair) = DECL_NAME (enu); |
4ee9c684 | 7704 | TREE_VALUE (pair) = ini; |
dcf6eb8b | 7705 | } |
51ef3909 | 7706 | |
cbf39c1f | 7707 | TYPE_VALUES (enumtype) = values; |
7708 | } | |
51ef3909 | 7709 | |
4ee9c684 | 7710 | /* Record the min/max values so that we can warn about bit-field |
7711 | enumerations that are too small for the values. */ | |
25a27413 | 7712 | lt = ggc_cleared_alloc<struct lang_type> (); |
4ee9c684 | 7713 | lt->enum_min = minnode; |
7714 | lt->enum_max = maxnode; | |
7715 | TYPE_LANG_SPECIFIC (enumtype) = lt; | |
7716 | ||
b97ea329 | 7717 | /* Fix up all variant types of this enum type. */ |
7718 | for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem)) | |
7719 | { | |
dcf6eb8b | 7720 | if (tem == enumtype) |
7721 | continue; | |
b97ea329 | 7722 | TYPE_VALUES (tem) = TYPE_VALUES (enumtype); |
7723 | TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype); | |
7724 | TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype); | |
7725 | TYPE_SIZE (tem) = TYPE_SIZE (enumtype); | |
24a7e611 | 7726 | TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype); |
342ad2d6 | 7727 | SET_TYPE_MODE (tem, TYPE_MODE (enumtype)); |
b97ea329 | 7728 | TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype); |
7729 | TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype); | |
aca14577 | 7730 | TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype); |
78a8ed03 | 7731 | TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype); |
4ee9c684 | 7732 | TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype); |
b97ea329 | 7733 | } |
7734 | ||
51ef3909 | 7735 | /* Finish debugging output for this type. */ |
7736 | rest_of_type_compilation (enumtype, toplevel); | |
7737 | ||
0b09525f | 7738 | /* If this enum is defined inside a struct, add it to |
843bd2fa | 7739 | struct_types. */ |
7740 | if (warn_cxx_compat | |
7741 | && struct_parse_info != NULL | |
7742 | && !in_sizeof && !in_typeof && !in_alignof) | |
f1f41a6c | 7743 | struct_parse_info->struct_types.safe_push (enumtype); |
0b09525f | 7744 | |
51ef3909 | 7745 | return enumtype; |
7746 | } | |
7747 | ||
7748 | /* Build and install a CONST_DECL for one value of the | |
7749 | current enumeration type (one that was begun with start_enum). | |
5a7ce2ec | 7750 | DECL_LOC is the location of the enumerator. |
7751 | LOC is the location of the '=' operator if any, DECL_LOC otherwise. | |
51ef3909 | 7752 | Return a tree-list containing the CONST_DECL and its value. |
7753 | Assignment of sequential values by default is handled here. */ | |
7754 | ||
7755 | tree | |
5a7ce2ec | 7756 | build_enumerator (location_t decl_loc, location_t loc, |
e60a6f7b | 7757 | struct c_enum_contents *the_enum, tree name, tree value) |
51ef3909 | 7758 | { |
19cb6b50 | 7759 | tree decl, type; |
51ef3909 | 7760 | |
7761 | /* Validate and default VALUE. */ | |
7762 | ||
ad5a5207 | 7763 | if (value != 0) |
d645d7e9 | 7764 | { |
393b349a | 7765 | /* Don't issue more errors for error_mark_node (i.e. an |
7766 | undeclared identifier) - just ignore the value expression. */ | |
7767 | if (value == error_mark_node) | |
7768 | value = 0; | |
bcb531e5 | 7769 | else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))) |
3b7bdb26 | 7770 | { |
e60a6f7b | 7771 | error_at (loc, "enumerator value for %qE is not an integer constant", |
7772 | name); | |
393b349a | 7773 | value = 0; |
3b7bdb26 | 7774 | } |
d645d7e9 | 7775 | else |
7776 | { | |
bcb531e5 | 7777 | if (TREE_CODE (value) != INTEGER_CST) |
7778 | { | |
7779 | value = c_fully_fold (value, false, NULL); | |
7780 | if (TREE_CODE (value) == INTEGER_CST) | |
29438999 | 7781 | pedwarn (loc, OPT_Wpedantic, |
bcb531e5 | 7782 | "enumerator value for %qE is not an integer " |
7783 | "constant expression", name); | |
7784 | } | |
7785 | if (TREE_CODE (value) != INTEGER_CST) | |
7786 | { | |
7787 | error ("enumerator value for %qE is not an integer constant", | |
7788 | name); | |
7789 | value = 0; | |
7790 | } | |
7791 | else | |
7792 | { | |
7793 | value = default_conversion (value); | |
7794 | constant_expression_warning (value); | |
7795 | } | |
d645d7e9 | 7796 | } |
7797 | } | |
51ef3909 | 7798 | |
7799 | /* Default based on previous value. */ | |
7800 | /* It should no longer be possible to have NON_LVALUE_EXPR | |
7801 | in the default. */ | |
7802 | if (value == 0) | |
88c7c4d5 | 7803 | { |
13c7079e | 7804 | value = the_enum->enum_next_value; |
7805 | if (the_enum->enum_overflow) | |
e60a6f7b | 7806 | error_at (loc, "overflow in enumeration values"); |
88c7c4d5 | 7807 | } |
e8fc0d34 | 7808 | /* Even though the underlying type of an enum is unspecified, the |
7809 | type of enumeration constants is explicitly defined as int | |
7810 | (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as | |
7811 | an extension. */ | |
7812 | else if (!int_fits_type_p (value, integer_type_node)) | |
29438999 | 7813 | pedwarn (loc, OPT_Wpedantic, |
21ca8540 | 7814 | "ISO C restricts enumerator values to range of %<int%>"); |
51ef3909 | 7815 | |
9fe4fa50 | 7816 | /* The ISO C Standard mandates enumerators to have type int, even |
7817 | though the underlying type of an enum type is unspecified. | |
7818 | However, GCC allows enumerators of any integer type as an | |
7819 | extensions. Here we convert any enumerators that fit in an int | |
7820 | to type int, to avoid promotions to unsigned types when comparing | |
7821 | integers with enumerators that fit in the int range. When | |
7822 | -pedantic is given, we would have already warned about those that | |
7823 | don't fit. We have to do this here rather than in finish_enum | |
7824 | because this value may be used to define more enumerators. */ | |
7825 | if (int_fits_type_p (value, integer_type_node)) | |
7826 | value = convert (integer_type_node, value); | |
7827 | ||
51ef3909 | 7828 | /* Set basis for default for next value. */ |
8e70fb09 | 7829 | the_enum->enum_next_value |
3df42822 | 7830 | = build_binary_op (EXPR_LOC_OR_LOC (value, input_location), |
8637f1db | 7831 | PLUS_EXPR, value, integer_one_node, 0); |
13c7079e | 7832 | the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value); |
51ef3909 | 7833 | |
7834 | /* Now create a declaration for the enum value name. */ | |
7835 | ||
a7925e0c | 7836 | type = TREE_TYPE (value); |
771d21fa | 7837 | type = c_common_type_for_size (MAX (TYPE_PRECISION (type), |
7838 | TYPE_PRECISION (integer_type_node)), | |
7839 | (TYPE_PRECISION (type) | |
7840 | >= TYPE_PRECISION (integer_type_node) | |
78a8ed03 | 7841 | && TYPE_UNSIGNED (type))); |
a7925e0c | 7842 | |
5a7ce2ec | 7843 | decl = build_decl (decl_loc, CONST_DECL, name, type); |
79efd58a | 7844 | DECL_INITIAL (decl) = convert (type, value); |
51ef3909 | 7845 | pushdecl (decl); |
7846 | ||
f8b540f2 | 7847 | return tree_cons (decl, value, NULL_TREE); |
51ef3909 | 7848 | } |
e41f0d80 | 7849 | |
51ef3909 | 7850 | \f |
7851 | /* Create the FUNCTION_DECL for a function definition. | |
b1d10e93 | 7852 | DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of |
e62f363b | 7853 | the declaration; they describe the function's name and the type it returns, |
51ef3909 | 7854 | but twisted together in a fashion that parallels the syntax of C. |
7855 | ||
7856 | This function creates a binding context for the function body | |
7857 | as well as setting up the FUNCTION_DECL in current_function_decl. | |
7858 | ||
7859 | Returns 1 on success. If the DECLARATOR is not suitable for a function | |
7860 | (it defines a datum instead), we return 0, which tells | |
f8b540f2 | 7861 | yyparse to report a parse error. */ |
51ef3909 | 7862 | |
7863 | int | |
9553111d | 7864 | start_function (struct c_declspecs *declspecs, struct c_declarator *declarator, |
ac206aff | 7865 | tree attributes) |
51ef3909 | 7866 | { |
7867 | tree decl1, old_decl; | |
540edea7 | 7868 | tree restype, resdecl; |
e60a6f7b | 7869 | location_t loc; |
51ef3909 | 7870 | |
a92771b8 | 7871 | current_function_returns_value = 0; /* Assume, until we see it does. */ |
51ef3909 | 7872 | current_function_returns_null = 0; |
af857942 | 7873 | current_function_returns_abnormally = 0; |
51ef3909 | 7874 | warn_about_return_type = 0; |
0375a275 | 7875 | c_switch_stack = NULL; |
7876 | ||
7877 | /* Indicate no valid break/continue context by setting these variables | |
7878 | to some non-null, non-label value. We'll notice and emit the proper | |
7879 | error message in c_finish_bc_stmt. */ | |
7880 | c_break_label = c_cont_label = size_zero_node; | |
51ef3909 | 7881 | |
81f218ec | 7882 | decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL, |
a75b1c71 | 7883 | &attributes, NULL, NULL, DEPRECATED_NORMAL); |
51ef3909 | 7884 | |
7885 | /* If the declarator is not suitable for a function definition, | |
7886 | cause a syntax error. */ | |
6b9c4a52 | 7887 | if (decl1 == 0 |
7888 | || TREE_CODE (decl1) != FUNCTION_DECL) | |
f805d53d | 7889 | return 0; |
51ef3909 | 7890 | |
e60a6f7b | 7891 | loc = DECL_SOURCE_LOCATION (decl1); |
7892 | ||
bc7bff74 | 7893 | c_decl_attributes (&decl1, attributes, 0); |
82656fbf | 7894 | |
93f10b04 | 7895 | if (DECL_DECLARED_INLINE_P (decl1) |
7896 | && DECL_UNINLINABLE (decl1) | |
7897 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1))) | |
e60a6f7b | 7898 | warning_at (loc, OPT_Wattributes, |
7899 | "inline function %qD given attribute noinline", | |
7900 | decl1); | |
93f10b04 | 7901 | |
541e4101 | 7902 | /* Handle gnu_inline attribute. */ |
7903 | if (declspecs->inline_p | |
11950bdd | 7904 | && !flag_gnu89_inline |
541e4101 | 7905 | && TREE_CODE (decl1) == FUNCTION_DECL |
56f06eef | 7906 | && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1)) |
7907 | || current_function_decl)) | |
541e4101 | 7908 | { |
7909 | if (declspecs->storage_class != csc_static) | |
7910 | DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1); | |
7911 | } | |
541e4101 | 7912 | |
51ef3909 | 7913 | announce_function (decl1); |
7914 | ||
4b72716d | 7915 | if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1)))) |
51ef3909 | 7916 | { |
e60a6f7b | 7917 | error_at (loc, "return type is an incomplete type"); |
51ef3909 | 7918 | /* Make it return void instead. */ |
7919 | TREE_TYPE (decl1) | |
7920 | = build_function_type (void_type_node, | |
7921 | TYPE_ARG_TYPES (TREE_TYPE (decl1))); | |
7922 | } | |
7923 | ||
7924 | if (warn_about_return_type) | |
508ea33a | 7925 | warn_defaults_to (loc, flag_isoc99 ? 0 |
7926 | : (warn_return_type ? OPT_Wreturn_type | |
7927 | : OPT_Wimplicit_int), | |
7928 | "return type defaults to %<int%>"); | |
51ef3909 | 7929 | |
51ef3909 | 7930 | /* Make the init_value nonzero so pushdecl knows this is not tentative. |
393b349a | 7931 | error_mark_node is replaced below (in pop_scope) with the BLOCK. */ |
51ef3909 | 7932 | DECL_INITIAL (decl1) = error_mark_node; |
7933 | ||
15f85477 | 7934 | /* A nested function is not global. */ |
7935 | if (current_function_decl != 0) | |
7936 | TREE_PUBLIC (decl1) = 0; | |
7937 | ||
51ef3909 | 7938 | /* If this definition isn't a prototype and we had a prototype declaration |
81506bec | 7939 | before, copy the arg type info from that prototype. */ |
393b349a | 7940 | old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope); |
4d5ac30e | 7941 | if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL) |
7942 | old_decl = 0; | |
3eafcdb5 | 7943 | current_function_prototype_locus = UNKNOWN_LOCATION; |
7944 | current_function_prototype_built_in = false; | |
7945 | current_function_prototype_arg_types = NULL_TREE; | |
a36cf284 | 7946 | if (!prototype_p (TREE_TYPE (decl1))) |
3eafcdb5 | 7947 | { |
7948 | if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE | |
7949 | && comptypes (TREE_TYPE (TREE_TYPE (decl1)), | |
7950 | TREE_TYPE (TREE_TYPE (old_decl)))) | |
7951 | { | |
7952 | TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl), | |
7953 | TREE_TYPE (decl1)); | |
7954 | current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl); | |
7955 | current_function_prototype_built_in | |
7956 | = C_DECL_BUILTIN_PROTOTYPE (old_decl); | |
7957 | current_function_prototype_arg_types | |
7958 | = TYPE_ARG_TYPES (TREE_TYPE (decl1)); | |
7959 | } | |
7960 | if (TREE_PUBLIC (decl1)) | |
7961 | { | |
7962 | /* If there is an external prototype declaration of this | |
7963 | function, record its location but do not copy information | |
7964 | to this decl. This may be an invisible declaration | |
7965 | (built-in or in a scope which has finished) or simply | |
7966 | have more refined argument types than any declaration | |
7967 | found above. */ | |
7968 | struct c_binding *b; | |
7969 | for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed) | |
7970 | if (B_IN_SCOPE (b, external_scope)) | |
7971 | break; | |
7972 | if (b) | |
7973 | { | |
7974 | tree ext_decl, ext_type; | |
7975 | ext_decl = b->decl; | |
f805d53d | 7976 | ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl); |
3eafcdb5 | 7977 | if (TREE_CODE (ext_type) == FUNCTION_TYPE |
7978 | && comptypes (TREE_TYPE (TREE_TYPE (decl1)), | |
7979 | TREE_TYPE (ext_type))) | |
7980 | { | |
7981 | current_function_prototype_locus | |
7982 | = DECL_SOURCE_LOCATION (ext_decl); | |
7983 | current_function_prototype_built_in | |
7984 | = C_DECL_BUILTIN_PROTOTYPE (ext_decl); | |
7985 | current_function_prototype_arg_types | |
7986 | = TYPE_ARG_TYPES (ext_type); | |
7987 | } | |
7988 | } | |
7989 | } | |
06460bd1 | 7990 | } |
51ef3909 | 7991 | |
7992 | /* Optionally warn of old-fashioned def with no previous prototype. */ | |
7993 | if (warn_strict_prototypes | |
494fc9d0 | 7994 | && old_decl != error_mark_node |
a36cf284 | 7995 | && !prototype_p (TREE_TYPE (decl1)) |
31ddae9f | 7996 | && C_DECL_ISNT_PROTOTYPE (old_decl)) |
e60a6f7b | 7997 | warning_at (loc, OPT_Wstrict_prototypes, |
7998 | "function declaration isn%'t a prototype"); | |
51ef3909 | 7999 | /* Optionally warn of any global def with no previous prototype. */ |
8000 | else if (warn_missing_prototypes | |
494fc9d0 | 8001 | && old_decl != error_mark_node |
51ef3909 | 8002 | && TREE_PUBLIC (decl1) |
84166705 | 8003 | && !MAIN_NAME_P (DECL_NAME (decl1)) |
bdf1e3c7 | 8004 | && C_DECL_ISNT_PROTOTYPE (old_decl) |
8005 | && !DECL_DECLARED_INLINE_P (decl1)) | |
e60a6f7b | 8006 | warning_at (loc, OPT_Wmissing_prototypes, |
8007 | "no previous prototype for %qD", decl1); | |
51ef3909 | 8008 | /* Optionally warn of any def with no previous prototype |
8009 | if the function has already been used. */ | |
8010 | else if (warn_missing_prototypes | |
494fc9d0 | 8011 | && old_decl != 0 |
8012 | && old_decl != error_mark_node | |
8013 | && TREE_USED (old_decl) | |
a36cf284 | 8014 | && !prototype_p (TREE_TYPE (old_decl))) |
e60a6f7b | 8015 | warning_at (loc, OPT_Wmissing_prototypes, |
8016 | "%qD was used with no prototype before its definition", decl1); | |
230c3e29 | 8017 | /* Optionally warn of any global def with no previous declaration. */ |
8018 | else if (warn_missing_declarations | |
8019 | && TREE_PUBLIC (decl1) | |
8020 | && old_decl == 0 | |
84166705 | 8021 | && !MAIN_NAME_P (DECL_NAME (decl1))) |
e60a6f7b | 8022 | warning_at (loc, OPT_Wmissing_declarations, |
8023 | "no previous declaration for %qD", | |
8024 | decl1); | |
230c3e29 | 8025 | /* Optionally warn of any def with no previous declaration |
8026 | if the function has already been used. */ | |
8027 | else if (warn_missing_declarations | |
494fc9d0 | 8028 | && old_decl != 0 |
8029 | && old_decl != error_mark_node | |
8030 | && TREE_USED (old_decl) | |
31ddae9f | 8031 | && C_DECL_IMPLICIT (old_decl)) |
e60a6f7b | 8032 | warning_at (loc, OPT_Wmissing_declarations, |
8033 | "%qD was used with no declaration before its definition", decl1); | |
51ef3909 | 8034 | |
51ef3909 | 8035 | /* This function exists in static storage. |
8036 | (This does not mean `static' in the C sense!) */ | |
8037 | TREE_STATIC (decl1) = 1; | |
8038 | ||
418089c3 | 8039 | /* This is the earliest point at which we might know the assembler |
8040 | name of the function. Thus, if it's set before this, die horribly. */ | |
231bd014 | 8041 | gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1)); |
418089c3 | 8042 | |
8043 | /* If #pragma weak was used, mark the decl weak now. */ | |
393b349a | 8044 | if (current_scope == file_scope) |
418089c3 | 8045 | maybe_apply_pragma_weak (decl1); |
8046 | ||
4214af46 | 8047 | /* Warn for unlikely, improbable, or stupid declarations of `main'. */ |
23efcc02 | 8048 | if (warn_main && MAIN_NAME_P (DECL_NAME (decl1))) |
869a2569 | 8049 | { |
869a2569 | 8050 | if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1))) |
4214af46 | 8051 | != integer_type_node) |
e60a6f7b | 8052 | pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1); |
2026249a | 8053 | else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1)))) |
8054 | pedwarn (loc, OPT_Wmain, "%<_Atomic%>-qualified return type of %qD", | |
8055 | decl1); | |
869a2569 | 8056 | |
23efcc02 | 8057 | check_main_parameter_types (decl1); |
869a2569 | 8058 | |
84166705 | 8059 | if (!TREE_PUBLIC (decl1)) |
e60a6f7b | 8060 | pedwarn (loc, OPT_Wmain, |
8061 | "%qD is normally a non-static function", decl1); | |
869a2569 | 8062 | } |
8063 | ||
51ef3909 | 8064 | /* Record the decl so that the function name is defined. |
8065 | If we already have a decl for this name, and it is a FUNCTION_DECL, | |
8066 | use the old decl. */ | |
8067 | ||
8068 | current_function_decl = pushdecl (decl1); | |
8069 | ||
393b349a | 8070 | push_scope (); |
2b652cf3 | 8071 | declare_parm_level (); |
51ef3909 | 8072 | |
51ef3909 | 8073 | restype = TREE_TYPE (TREE_TYPE (current_function_decl)); |
e60a6f7b | 8074 | resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype); |
540edea7 | 8075 | DECL_ARTIFICIAL (resdecl) = 1; |
8076 | DECL_IGNORED_P (resdecl) = 1; | |
8077 | DECL_RESULT (current_function_decl) = resdecl; | |
51ef3909 | 8078 | |
65b7f83f | 8079 | start_fname_decls (); |
1cae46be | 8080 | |
51ef3909 | 8081 | return 1; |
8082 | } | |
51ef3909 | 8083 | \f |
c917d901 | 8084 | /* Subroutine of store_parm_decls which handles new-style function |
8085 | definitions (prototype format). The parms already have decls, so we | |
8086 | need only record them as in effect and complain if any redundant | |
8087 | old-style parm decls were written. */ | |
38401f3c | 8088 | static void |
ac206aff | 8089 | store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info) |
51ef3909 | 8090 | { |
393b349a | 8091 | tree decl; |
9d61f04b | 8092 | c_arg_tag *tag; |
8093 | unsigned ix; | |
51ef3909 | 8094 | |
393b349a | 8095 | if (current_scope->bindings) |
c917d901 | 8096 | { |
712d2297 | 8097 | error_at (DECL_SOURCE_LOCATION (fndecl), |
8098 | "old-style parameter declarations in prototyped " | |
8099 | "function definition"); | |
51ef3909 | 8100 | |
c917d901 | 8101 | /* Get rid of the old-style declarations. */ |
393b349a | 8102 | pop_scope (); |
8103 | push_scope (); | |
8104 | } | |
8105 | /* Don't issue this warning for nested functions, and don't issue this | |
8106 | warning if we got here because ARG_INFO_TYPES was error_mark_node | |
8107 | (this happens when a function definition has just an ellipsis in | |
8108 | its parameter list). */ | |
3df42822 | 8109 | else if (!in_system_header_at (input_location) |
8110 | && !current_function_scope | |
ac206aff | 8111 | && arg_info->types != error_mark_node) |
712d2297 | 8112 | warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional, |
8113 | "traditional C rejects ISO C style function definitions"); | |
51ef3909 | 8114 | |
f74be9a1 | 8115 | /* Now make all the parameter declarations visible in the function body. |
8116 | We can bypass most of the grunt work of pushdecl. */ | |
1767a056 | 8117 | for (decl = arg_info->parms; decl; decl = DECL_CHAIN (decl)) |
c917d901 | 8118 | { |
f74be9a1 | 8119 | DECL_CONTEXT (decl) = current_function_decl; |
393b349a | 8120 | if (DECL_NAME (decl)) |
40c4b476 | 8121 | { |
8122 | bind (DECL_NAME (decl), decl, current_scope, | |
6fb80942 | 8123 | /*invisible=*/false, /*nested=*/false, |
8124 | UNKNOWN_LOCATION); | |
40c4b476 | 8125 | if (!TREE_USED (decl)) |
8126 | warn_if_shadowing (decl); | |
8127 | } | |
c917d901 | 8128 | else |
712d2297 | 8129 | error_at (DECL_SOURCE_LOCATION (decl), "parameter name omitted"); |
c917d901 | 8130 | } |
5f3cead1 | 8131 | |
c917d901 | 8132 | /* Record the parameter list in the function declaration. */ |
ac206aff | 8133 | DECL_ARGUMENTS (fndecl) = arg_info->parms; |
51ef3909 | 8134 | |
c917d901 | 8135 | /* Now make all the ancillary declarations visible, likewise. */ |
1767a056 | 8136 | for (decl = arg_info->others; decl; decl = DECL_CHAIN (decl)) |
f74be9a1 | 8137 | { |
8138 | DECL_CONTEXT (decl) = current_function_decl; | |
393b349a | 8139 | if (DECL_NAME (decl)) |
4194491a | 8140 | bind (DECL_NAME (decl), decl, current_scope, |
1799fbab | 8141 | /*invisible=*/false, |
8142 | /*nested=*/(TREE_CODE (decl) == FUNCTION_DECL), | |
8143 | UNKNOWN_LOCATION); | |
f74be9a1 | 8144 | } |
5f3cead1 | 8145 | |
c917d901 | 8146 | /* And all the tag declarations. */ |
f1f41a6c | 8147 | FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag) |
9d61f04b | 8148 | if (tag->id) |
8149 | bind (tag->id, tag->type, current_scope, | |
6fb80942 | 8150 | /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION); |
c917d901 | 8151 | } |
ce467a73 | 8152 | |
c917d901 | 8153 | /* Subroutine of store_parm_decls which handles old-style function |
8154 | definitions (separate parameter list and declarations). */ | |
51ef3909 | 8155 | |
c917d901 | 8156 | static void |
ac206aff | 8157 | store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info) |
c917d901 | 8158 | { |
393b349a | 8159 | struct c_binding *b; |
f74be9a1 | 8160 | tree parm, decl, last; |
ac206aff | 8161 | tree parmids = arg_info->parms; |
431205b7 | 8162 | hash_set<tree> seen_args; |
c917d901 | 8163 | |
3df42822 | 8164 | if (!in_system_header_at (input_location)) |
e60a6f7b | 8165 | warning_at (DECL_SOURCE_LOCATION (fndecl), |
8166 | OPT_Wold_style_definition, "old-style function definition"); | |
393b349a | 8167 | |
c917d901 | 8168 | /* Match each formal parameter name with its declaration. Save each |
8169 | decl in the appropriate TREE_PURPOSE slot of the parmids chain. */ | |
8170 | for (parm = parmids; parm; parm = TREE_CHAIN (parm)) | |
8171 | { | |
8172 | if (TREE_VALUE (parm) == 0) | |
9c316e51 | 8173 | { |
e60a6f7b | 8174 | error_at (DECL_SOURCE_LOCATION (fndecl), |
8175 | "parameter name missing from parameter list"); | |
c917d901 | 8176 | TREE_PURPOSE (parm) = 0; |
8177 | continue; | |
9c316e51 | 8178 | } |
51ef3909 | 8179 | |
393b349a | 8180 | b = I_SYMBOL_BINDING (TREE_VALUE (parm)); |
4194491a | 8181 | if (b && B_IN_CURRENT_SCOPE (b)) |
51ef3909 | 8182 | { |
393b349a | 8183 | decl = b->decl; |
0a4efe82 | 8184 | /* Skip erroneous parameters. */ |
8185 | if (decl == error_mark_node) | |
8186 | continue; | |
c917d901 | 8187 | /* If we got something other than a PARM_DECL it is an error. */ |
8188 | if (TREE_CODE (decl) != PARM_DECL) | |
e60a6f7b | 8189 | error_at (DECL_SOURCE_LOCATION (decl), |
8190 | "%qD declared as a non-parameter", decl); | |
c917d901 | 8191 | /* If the declaration is already marked, we have a duplicate |
8192 | name. Complain and ignore the duplicate. */ | |
431205b7 | 8193 | else if (seen_args.contains (decl)) |
51ef3909 | 8194 | { |
e60a6f7b | 8195 | error_at (DECL_SOURCE_LOCATION (decl), |
8196 | "multiple parameters named %qD", decl); | |
c917d901 | 8197 | TREE_PURPOSE (parm) = 0; |
8198 | continue; | |
51ef3909 | 8199 | } |
c917d901 | 8200 | /* If the declaration says "void", complain and turn it into |
8201 | an int. */ | |
8202 | else if (VOID_TYPE_P (TREE_TYPE (decl))) | |
51ef3909 | 8203 | { |
e60a6f7b | 8204 | error_at (DECL_SOURCE_LOCATION (decl), |
8205 | "parameter %qD declared with void type", decl); | |
c917d901 | 8206 | TREE_TYPE (decl) = integer_type_node; |
8207 | DECL_ARG_TYPE (decl) = integer_type_node; | |
8208 | layout_decl (decl, 0); | |
51ef3909 | 8209 | } |
40c4b476 | 8210 | warn_if_shadowing (decl); |
51ef3909 | 8211 | } |
c917d901 | 8212 | /* If no declaration found, default to int. */ |
8213 | else | |
51ef3909 | 8214 | { |
e60a6f7b | 8215 | /* FIXME diagnostics: This should be the location of the argument, |
8216 | not the FNDECL. E.g., for an old-style declaration | |
8217 | ||
8218 | int f10(v) { blah; } | |
8219 | ||
8220 | We should use the location of the V, not the F10. | |
8221 | Unfortunately, the V is an IDENTIFIER_NODE which has no | |
8222 | location. In the future we need locations for c_arg_info | |
8223 | entries. | |
8224 | ||
8225 | See gcc.dg/Wshadow-3.c for an example of this problem. */ | |
8226 | decl = build_decl (DECL_SOURCE_LOCATION (fndecl), | |
8227 | PARM_DECL, TREE_VALUE (parm), integer_type_node); | |
c917d901 | 8228 | DECL_ARG_TYPE (decl) = TREE_TYPE (decl); |
c917d901 | 8229 | pushdecl (decl); |
40c4b476 | 8230 | warn_if_shadowing (decl); |
c917d901 | 8231 | |
8232 | if (flag_isoc99) | |
e60a6f7b | 8233 | pedwarn (DECL_SOURCE_LOCATION (decl), |
8234 | 0, "type of %qD defaults to %<int%>", decl); | |
48e1416a | 8235 | else |
e60a6f7b | 8236 | warning_at (DECL_SOURCE_LOCATION (decl), |
8237 | OPT_Wmissing_parameter_type, | |
8238 | "type of %qD defaults to %<int%>", decl); | |
51ef3909 | 8239 | } |
8240 | ||
c917d901 | 8241 | TREE_PURPOSE (parm) = decl; |
431205b7 | 8242 | seen_args.add (decl); |
51ef3909 | 8243 | } |
51ef3909 | 8244 | |
f74be9a1 | 8245 | /* Now examine the parms chain for incomplete declarations |
8246 | and declarations with no corresponding names. */ | |
51ef3909 | 8247 | |
393b349a | 8248 | for (b = current_scope->bindings; b; b = b->prev) |
c917d901 | 8249 | { |
393b349a | 8250 | parm = b->decl; |
8251 | if (TREE_CODE (parm) != PARM_DECL) | |
8252 | continue; | |
8253 | ||
69c2525c | 8254 | if (TREE_TYPE (parm) != error_mark_node |
8255 | && !COMPLETE_TYPE_P (TREE_TYPE (parm))) | |
51ef3909 | 8256 | { |
e60a6f7b | 8257 | error_at (DECL_SOURCE_LOCATION (parm), |
8258 | "parameter %qD has incomplete type", parm); | |
c917d901 | 8259 | TREE_TYPE (parm) = error_mark_node; |
8260 | } | |
51ef3909 | 8261 | |
431205b7 | 8262 | if (!seen_args.contains (parm)) |
c917d901 | 8263 | { |
e60a6f7b | 8264 | error_at (DECL_SOURCE_LOCATION (parm), |
8265 | "declaration for parameter %qD but no such parameter", | |
8266 | parm); | |
51ef3909 | 8267 | |
c917d901 | 8268 | /* Pretend the parameter was not missing. |
8269 | This gets us to a standard state and minimizes | |
8270 | further error messages. */ | |
8271 | parmids = chainon (parmids, tree_cons (parm, 0, 0)); | |
51ef3909 | 8272 | } |
c917d901 | 8273 | } |
51ef3909 | 8274 | |
c917d901 | 8275 | /* Chain the declarations together in the order of the list of |
8276 | names. Store that chain in the function decl, replacing the | |
f74be9a1 | 8277 | list of names. Update the current scope to match. */ |
c917d901 | 8278 | DECL_ARGUMENTS (fndecl) = 0; |
c917d901 | 8279 | |
f74be9a1 | 8280 | for (parm = parmids; parm; parm = TREE_CHAIN (parm)) |
8281 | if (TREE_PURPOSE (parm)) | |
8282 | break; | |
8283 | if (parm && TREE_PURPOSE (parm)) | |
8284 | { | |
8285 | last = TREE_PURPOSE (parm); | |
8286 | DECL_ARGUMENTS (fndecl) = last; | |
f74be9a1 | 8287 | |
8288 | for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm)) | |
8289 | if (TREE_PURPOSE (parm)) | |
8290 | { | |
1767a056 | 8291 | DECL_CHAIN (last) = TREE_PURPOSE (parm); |
f74be9a1 | 8292 | last = TREE_PURPOSE (parm); |
f74be9a1 | 8293 | } |
1767a056 | 8294 | DECL_CHAIN (last) = 0; |
f74be9a1 | 8295 | } |
51ef3909 | 8296 | |
c917d901 | 8297 | /* If there was a previous prototype, |
8298 | set the DECL_ARG_TYPE of each argument according to | |
8299 | the type previously specified, and report any mismatches. */ | |
51ef3909 | 8300 | |
3eafcdb5 | 8301 | if (current_function_prototype_arg_types) |
c917d901 | 8302 | { |
8303 | tree type; | |
8304 | for (parm = DECL_ARGUMENTS (fndecl), | |
3eafcdb5 | 8305 | type = current_function_prototype_arg_types; |
9db402ec | 8306 | parm || (type && TREE_VALUE (type) != error_mark_node |
8307 | && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node)); | |
1767a056 | 8308 | parm = DECL_CHAIN (parm), type = TREE_CHAIN (type)) |
51ef3909 | 8309 | { |
c917d901 | 8310 | if (parm == 0 || type == 0 |
8311 | || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node) | |
51ef3909 | 8312 | { |
3eafcdb5 | 8313 | if (current_function_prototype_built_in) |
e60a6f7b | 8314 | warning_at (DECL_SOURCE_LOCATION (fndecl), |
8315 | 0, "number of arguments doesn%'t match " | |
8316 | "built-in prototype"); | |
3eafcdb5 | 8317 | else |
8318 | { | |
e60a6f7b | 8319 | /* FIXME diagnostics: This should be the location of |
8320 | FNDECL, but there is bug when a prototype is | |
8321 | declared inside function context, but defined | |
8322 | outside of it (e.g., gcc.dg/pr15698-2.c). In | |
8323 | which case FNDECL gets the location of the | |
8324 | prototype, not the definition. */ | |
8325 | error_at (input_location, | |
8326 | "number of arguments doesn%'t match prototype"); | |
8327 | ||
8328 | error_at (current_function_prototype_locus, | |
8329 | "prototype declaration"); | |
3eafcdb5 | 8330 | } |
c917d901 | 8331 | break; |
8332 | } | |
8333 | /* Type for passing arg must be consistent with that | |
8334 | declared for the arg. ISO C says we take the unqualified | |
8335 | type for parameters declared with qualified type. */ | |
e911c0fe | 8336 | if (TREE_TYPE (parm) != error_mark_node |
8337 | && TREE_TYPE (type) != error_mark_node | |
b560fabd | 8338 | && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm)) |
8339 | != TYPE_ATOMIC (TREE_VALUE (type))) | |
8340 | || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)), | |
8341 | TYPE_MAIN_VARIANT (TREE_VALUE (type))))) | |
c917d901 | 8342 | { |
b560fabd | 8343 | if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm)) |
8344 | == TYPE_ATOMIC (TREE_VALUE (type))) | |
8345 | && (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) | |
8346 | == TYPE_MAIN_VARIANT (TREE_VALUE (type)))) | |
51ef3909 | 8347 | { |
c917d901 | 8348 | /* Adjust argument to match prototype. E.g. a previous |
8349 | `int foo(float);' prototype causes | |
8350 | `int foo(x) float x; {...}' to be treated like | |
8351 | `int foo(float x) {...}'. This is particularly | |
8352 | useful for argument types like uid_t. */ | |
8353 | DECL_ARG_TYPE (parm) = TREE_TYPE (parm); | |
8354 | ||
45550790 | 8355 | if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl)) |
c917d901 | 8356 | && INTEGRAL_TYPE_P (TREE_TYPE (parm)) |
8357 | && TYPE_PRECISION (TREE_TYPE (parm)) | |
8358 | < TYPE_PRECISION (integer_type_node)) | |
b560fabd | 8359 | DECL_ARG_TYPE (parm) |
8360 | = c_type_promotes_to (TREE_TYPE (parm)); | |
c917d901 | 8361 | |
8864917d | 8362 | /* ??? Is it possible to get here with a |
8363 | built-in prototype or will it always have | |
8364 | been diagnosed as conflicting with an | |
8365 | old-style definition and discarded? */ | |
8366 | if (current_function_prototype_built_in) | |
e60a6f7b | 8367 | warning_at (DECL_SOURCE_LOCATION (parm), |
29438999 | 8368 | OPT_Wpedantic, "promoted argument %qD " |
e60a6f7b | 8369 | "doesn%'t match built-in prototype", parm); |
8864917d | 8370 | else |
06460bd1 | 8371 | { |
e60a6f7b | 8372 | pedwarn (DECL_SOURCE_LOCATION (parm), |
29438999 | 8373 | OPT_Wpedantic, "promoted argument %qD " |
8864917d | 8374 | "doesn%'t match prototype", parm); |
29438999 | 8375 | pedwarn (current_function_prototype_locus, OPT_Wpedantic, |
21ca8540 | 8376 | "prototype declaration"); |
06460bd1 | 8377 | } |
51ef3909 | 8378 | } |
c917d901 | 8379 | else |
8380 | { | |
3eafcdb5 | 8381 | if (current_function_prototype_built_in) |
e60a6f7b | 8382 | warning_at (DECL_SOURCE_LOCATION (parm), |
8383 | 0, "argument %qD doesn%'t match " | |
8384 | "built-in prototype", parm); | |
3eafcdb5 | 8385 | else |
8386 | { | |
e60a6f7b | 8387 | error_at (DECL_SOURCE_LOCATION (parm), |
8388 | "argument %qD doesn%'t match prototype", parm); | |
8389 | error_at (current_function_prototype_locus, | |
8390 | "prototype declaration"); | |
3eafcdb5 | 8391 | } |
c917d901 | 8392 | } |
51ef3909 | 8393 | } |
51ef3909 | 8394 | } |
c917d901 | 8395 | TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0; |
8396 | } | |
51ef3909 | 8397 | |
c917d901 | 8398 | /* Otherwise, create a prototype that would match. */ |
51ef3909 | 8399 | |
c917d901 | 8400 | else |
8401 | { | |
8402 | tree actual = 0, last = 0, type; | |
51ef3909 | 8403 | |
1767a056 | 8404 | for (parm = DECL_ARGUMENTS (fndecl); parm; parm = DECL_CHAIN (parm)) |
c917d901 | 8405 | { |
8406 | type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE); | |
51ef3909 | 8407 | if (last) |
8408 | TREE_CHAIN (last) = type; | |
8409 | else | |
8410 | actual = type; | |
c917d901 | 8411 | last = type; |
8412 | } | |
8413 | type = tree_cons (NULL_TREE, void_type_node, NULL_TREE); | |
8414 | if (last) | |
8415 | TREE_CHAIN (last) = type; | |
8416 | else | |
8417 | actual = type; | |
51ef3909 | 8418 | |
c917d901 | 8419 | /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES |
8420 | of the type of this function, but we need to avoid having this | |
8421 | affect the types of other similarly-typed functions, so we must | |
8422 | first force the generation of an identical (but separate) type | |
8423 | node for the relevant function type. The new node we create | |
8424 | will be a variant of the main variant of the original function | |
8425 | type. */ | |
c275c235 | 8426 | |
e086912e | 8427 | TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl)); |
c275c235 | 8428 | |
c917d901 | 8429 | TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual; |
8430 | } | |
c917d901 | 8431 | } |
8432 | ||
38401f3c | 8433 | /* Store parameter declarations passed in ARG_INFO into the current |
8434 | function declaration. */ | |
8435 | ||
8436 | void | |
ac206aff | 8437 | store_parm_decls_from (struct c_arg_info *arg_info) |
38401f3c | 8438 | { |
8439 | current_function_arg_info = arg_info; | |
8440 | store_parm_decls (); | |
8441 | } | |
8442 | ||
c917d901 | 8443 | /* Store the parameter declarations into the current function declaration. |
8444 | This is called after parsing the parameter declarations, before | |
8445 | digesting the body of the function. | |
8446 | ||
8447 | For an old-style definition, construct a prototype out of the old-style | |
8448 | parameter declarations and inject it into the function's type. */ | |
8449 | ||
8450 | void | |
8451 | store_parm_decls (void) | |
8452 | { | |
8453 | tree fndecl = current_function_decl; | |
731e6cbf | 8454 | bool proto; |
c917d901 | 8455 | |
a89ce285 | 8456 | /* The argument information block for FNDECL. */ |
ac206aff | 8457 | struct c_arg_info *arg_info = current_function_arg_info; |
731e6cbf | 8458 | current_function_arg_info = 0; |
a89ce285 | 8459 | |
393b349a | 8460 | /* True if this definition is written with a prototype. Note: |
8461 | despite C99 6.7.5.3p14, we can *not* treat an empty argument | |
8462 | list in a function definition as equivalent to (void) -- an | |
8463 | empty argument list specifies the function has no parameters, | |
8464 | but only (void) sets up a prototype for future calls. */ | |
ac206aff | 8465 | proto = arg_info->types != 0; |
c917d901 | 8466 | |
393b349a | 8467 | if (proto) |
a89ce285 | 8468 | store_parm_decls_newstyle (fndecl, arg_info); |
c917d901 | 8469 | else |
a89ce285 | 8470 | store_parm_decls_oldstyle (fndecl, arg_info); |
51ef3909 | 8471 | |
393b349a | 8472 | /* The next call to push_scope will be a function body. */ |
51ef3909 | 8473 | |
e69f6ec7 | 8474 | next_is_function_body = true; |
51ef3909 | 8475 | |
51ef3909 | 8476 | /* Write a record describing this function definition to the prototypes |
8477 | file (if requested). */ | |
8478 | ||
393b349a | 8479 | gen_aux_info_record (fndecl, 1, 0, proto); |
51ef3909 | 8480 | |
8481 | /* Initialize the RTL code for the function. */ | |
80f2ef47 | 8482 | allocate_struct_function (fndecl, false); |
51ef3909 | 8483 | |
a4e3ffad | 8484 | if (warn_unused_local_typedefs) |
25a27413 | 8485 | cfun->language = ggc_cleared_alloc<language_function> (); |
a4e3ffad | 8486 | |
e41f0d80 | 8487 | /* Begin the statement tree for this function. */ |
2363ef00 | 8488 | DECL_SAVED_TREE (fndecl) = push_stmt_list (); |
51ef3909 | 8489 | |
67c155cb | 8490 | /* ??? Insert the contents of the pending sizes list into the function |
6b275368 | 8491 | to be evaluated. The only reason left to have this is |
8492 | void foo(int n, int array[n++]) | |
8493 | because we throw away the array type in favor of a pointer type, and | |
8494 | thus won't naturally see the SAVE_EXPR containing the increment. All | |
8495 | other pending sizes would be handled by gimplify_parameters. */ | |
4232a958 | 8496 | if (arg_info->pending_sizes) |
8497 | add_stmt (arg_info->pending_sizes); | |
51ef3909 | 8498 | } |
bc7bff74 | 8499 | |
8500 | /* Store PARM_DECLs in PARMS into scope temporarily. Used for | |
8501 | c_finish_omp_declare_simd for function prototypes. No diagnostics | |
8502 | should be done. */ | |
8503 | ||
8504 | void | |
8505 | temp_store_parm_decls (tree fndecl, tree parms) | |
8506 | { | |
8507 | push_scope (); | |
8508 | for (tree p = parms; p; p = DECL_CHAIN (p)) | |
8509 | { | |
8510 | DECL_CONTEXT (p) = fndecl; | |
8511 | if (DECL_NAME (p)) | |
8512 | bind (DECL_NAME (p), p, current_scope, | |
8513 | /*invisible=*/false, /*nested=*/false, | |
8514 | UNKNOWN_LOCATION); | |
8515 | } | |
8516 | } | |
8517 | ||
8518 | /* Undo what temp_store_parm_decls did. */ | |
8519 | ||
8520 | void | |
8521 | temp_pop_parm_decls (void) | |
8522 | { | |
8523 | /* Clear all bindings in this temporary scope, so that | |
8524 | pop_scope doesn't create a BLOCK. */ | |
8525 | struct c_binding *b = current_scope->bindings; | |
8526 | current_scope->bindings = NULL; | |
8527 | for (; b; b = free_binding_and_advance (b)) | |
8528 | { | |
8529 | gcc_assert (TREE_CODE (b->decl) == PARM_DECL); | |
8530 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); | |
8531 | I_SYMBOL_BINDING (b->id) = b->shadowed; | |
8532 | if (b->shadowed && b->shadowed->u.type) | |
8533 | TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type; | |
8534 | } | |
8535 | pop_scope (); | |
8536 | } | |
51ef3909 | 8537 | \f |
4ee9c684 | 8538 | |
51ef3909 | 8539 | /* Finish up a function declaration and compile that function |
dcf94f3a | 8540 | all the way to assembler language output. Then free the storage |
51ef3909 | 8541 | for the function definition. |
8542 | ||
2ff66ee0 | 8543 | This is called after parsing the body of the function definition. */ |
51ef3909 | 8544 | |
8545 | void | |
eb32e911 | 8546 | finish_function (void) |
51ef3909 | 8547 | { |
19cb6b50 | 8548 | tree fndecl = current_function_decl; |
d7489d8d | 8549 | |
8550 | if (c_dialect_objc ()) | |
8551 | objc_finish_function (); | |
51ef3909 | 8552 | |
45550790 | 8553 | if (TREE_CODE (fndecl) == FUNCTION_DECL |
8554 | && targetm.calls.promote_prototypes (TREE_TYPE (fndecl))) | |
8555 | { | |
8556 | tree args = DECL_ARGUMENTS (fndecl); | |
1767a056 | 8557 | for (; args; args = DECL_CHAIN (args)) |
a0c938f0 | 8558 | { |
8559 | tree type = TREE_TYPE (args); | |
8560 | if (INTEGRAL_TYPE_P (type) | |
8561 | && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) | |
b560fabd | 8562 | DECL_ARG_TYPE (args) = c_type_promotes_to (type); |
a0c938f0 | 8563 | } |
45550790 | 8564 | } |
8565 | ||
35aab7c4 | 8566 | if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node) |
fcbb2ca1 | 8567 | BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl; |
51ef3909 | 8568 | |
8569 | /* Must mark the RESULT_DECL as being in this function. */ | |
8570 | ||
35aab7c4 | 8571 | if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node) |
fcbb2ca1 | 8572 | DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl; |
51ef3909 | 8573 | |
23efcc02 | 8574 | if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted |
8575 | && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) | |
8576 | == integer_type_node && flag_isoc99) | |
8577 | { | |
23efcc02 | 8578 | /* Hack. We don't want the middle-end to warn that this return |
8579 | is unreachable, so we mark its location as special. Using | |
8580 | UNKNOWN_LOCATION has the problem that it gets clobbered in | |
8581 | annotate_one_with_locus. A cleaner solution might be to | |
8582 | ensure ! should_carry_locus_p (stmt), but that needs a flag. | |
8583 | */ | |
e60a6f7b | 8584 | c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE); |
51ef3909 | 8585 | } |
1cae46be | 8586 | |
e41f0d80 | 8587 | /* Tie off the statement tree for this function. */ |
2363ef00 | 8588 | DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl)); |
8589 | ||
d037099f | 8590 | /* If the function has _Cilk_spawn in front of a function call inside it |
8591 | i.e. it is a spawning function, then add the appropriate Cilk plus | |
8592 | functions inside. */ | |
8593 | if (fn_contains_cilk_spawn_p (cfun)) | |
8594 | cfun->cilk_frame_decl = insert_cilk_frame (fndecl); | |
8595 | ||
2363ef00 | 8596 | finish_fname_decls (); |
af857942 | 8597 | |
8598 | /* Complain if there's just no return statement. */ | |
4edb3605 | 8599 | if (warn_return_type |
8600 | && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE | |
af857942 | 8601 | && !current_function_returns_value && !current_function_returns_null |
a53ff4c1 | 8602 | /* Don't complain if we are no-return. */ |
af857942 | 8603 | && !current_function_returns_abnormally |
578d2695 | 8604 | /* Don't complain if we are declared noreturn. */ |
8605 | && !TREE_THIS_VOLATILE (fndecl) | |
af857942 | 8606 | /* Don't warn for main(). */ |
8607 | && !MAIN_NAME_P (DECL_NAME (fndecl)) | |
8608 | /* Or if they didn't actually specify a return type. */ | |
8609 | && !C_FUNCTION_IMPLICIT_INT (fndecl) | |
6329636b | 8610 | /* Normally, with -Wreturn-type, flow will complain, but we might |
8611 | optimize out static functions. */ | |
8612 | && !TREE_PUBLIC (fndecl)) | |
6a13f013 | 8613 | { |
6bf97f82 | 8614 | warning (OPT_Wreturn_type, |
8615 | "no return statement in function returning non-void"); | |
6a13f013 | 8616 | TREE_NO_WARNING (fndecl) = 1; |
8617 | } | |
af857942 | 8618 | |
abc6c64f | 8619 | /* Complain about parameters that are only set, but never otherwise used. */ |
8620 | if (warn_unused_but_set_parameter) | |
8621 | { | |
8622 | tree decl; | |
8623 | ||
8624 | for (decl = DECL_ARGUMENTS (fndecl); | |
8625 | decl; | |
1767a056 | 8626 | decl = DECL_CHAIN (decl)) |
abc6c64f | 8627 | if (TREE_USED (decl) |
8628 | && TREE_CODE (decl) == PARM_DECL | |
8629 | && !DECL_READ_P (decl) | |
8630 | && DECL_NAME (decl) | |
8631 | && !DECL_ARTIFICIAL (decl) | |
8632 | && !TREE_NO_WARNING (decl)) | |
8633 | warning_at (DECL_SOURCE_LOCATION (decl), | |
8634 | OPT_Wunused_but_set_parameter, | |
8635 | "parameter %qD set but not used", decl); | |
8636 | } | |
8637 | ||
a4e3ffad | 8638 | /* Complain about locally defined typedefs that are not used in this |
8639 | function. */ | |
8640 | maybe_warn_unused_local_typedefs (); | |
8641 | ||
4ee9c684 | 8642 | /* Store the end of the function, so that we get good line number |
8643 | info for the epilogue. */ | |
8644 | cfun->function_end_locus = input_location; | |
8645 | ||
3aa0c315 | 8646 | /* Finalize the ELF visibility for the function. */ |
8647 | c_determine_visibility (fndecl); | |
8648 | ||
ebb7d626 | 8649 | /* For GNU C extern inline functions disregard inline limits. */ |
48e1416a | 8650 | if (DECL_EXTERNAL (fndecl) |
ebb7d626 | 8651 | && DECL_DECLARED_INLINE_P (fndecl)) |
8652 | DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1; | |
8653 | ||
4ee9c684 | 8654 | /* Genericize before inlining. Delay genericizing nested functions |
8655 | until their parent function is genericized. Since finalizing | |
8656 | requires GENERIC, delay that as well. */ | |
14338e9a | 8657 | |
8a1f0315 | 8658 | if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node |
8659 | && !undef_nested_function) | |
4ee9c684 | 8660 | { |
8661 | if (!decl_function_context (fndecl)) | |
a0c938f0 | 8662 | { |
0bac94cb | 8663 | invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl); |
a0c938f0 | 8664 | c_genericize (fndecl); |
7a2371fd | 8665 | |
8666 | /* ??? Objc emits functions after finalizing the compilation unit. | |
8667 | This should be cleaned up later and this conditional removed. */ | |
35ee1c66 | 8668 | if (symtab->global_info_ready) |
7a2371fd | 8669 | { |
415d1b9a | 8670 | cgraph_node::add_new_function (fndecl, false); |
7a2371fd | 8671 | return; |
8672 | } | |
35ee1c66 | 8673 | cgraph_node::finalize_function (fndecl, false); |
a0c938f0 | 8674 | } |
4ee9c684 | 8675 | else |
a0c938f0 | 8676 | { |
8677 | /* Register this function with cgraph just far enough to get it | |
8678 | added to our parent's nested function list. Handy, since the | |
8679 | C front end doesn't have such a list. */ | |
415d1b9a | 8680 | (void) cgraph_node::get_create (fndecl); |
a0c938f0 | 8681 | } |
4ee9c684 | 8682 | } |
8683 | ||
8a1f0315 | 8684 | if (!decl_function_context (fndecl)) |
8685 | undef_nested_function = false; | |
8686 | ||
a4e3ffad | 8687 | if (cfun->language != NULL) |
8688 | { | |
8689 | ggc_free (cfun->language); | |
8690 | cfun->language = NULL; | |
8691 | } | |
8692 | ||
cbc44df5 | 8693 | /* We're leaving the context of this function, so zap cfun. |
4ee9c684 | 8694 | It's still in DECL_STRUCT_FUNCTION, and we'll restore it in |
cbc44df5 | 8695 | tree_rest_of_compilation. */ |
87d4aa85 | 8696 | set_cfun (NULL); |
2ff66ee0 | 8697 | current_function_decl = NULL; |
e41f0d80 | 8698 | } |
51ef3909 | 8699 | \f |
5e4f9988 | 8700 | /* Check the declarations given in a for-loop for satisfying the C99 |
e60a6f7b | 8701 | constraints. If exactly one such decl is found, return it. LOC is |
0a65c3bb | 8702 | the location of the opening parenthesis of the for loop. The last |
8703 | parameter allows you to control the "for loop initial declarations | |
8704 | are only allowed in C99 mode". Normally, you should pass | |
8705 | flag_isoc99 as that parameter. But in some cases (Objective-C | |
8706 | foreach loop, for example) we want to run the checks in this | |
8707 | function even if not in C99 mode, so we allow the caller to turn | |
8708 | off the error about not being in C99 mode. | |
8709 | */ | |
1e8e9920 | 8710 | |
8711 | tree | |
0a65c3bb | 8712 | check_for_loop_decls (location_t loc, bool turn_off_iso_c99_error) |
5e4f9988 | 8713 | { |
393b349a | 8714 | struct c_binding *b; |
1e8e9920 | 8715 | tree one_decl = NULL_TREE; |
8716 | int n_decls = 0; | |
8717 | ||
0a65c3bb | 8718 | if (!turn_off_iso_c99_error) |
5e4f9988 | 8719 | { |
2292dd7a | 8720 | static bool hint = true; |
5e4f9988 | 8721 | /* If we get here, declarations have been used in a for loop without |
8722 | the C99 for loop scope. This doesn't make much sense, so don't | |
8723 | allow it. */ | |
e60a6f7b | 8724 | error_at (loc, "%<for%> loop initial declarations " |
01e6cdb4 | 8725 | "are only allowed in C99 or C11 mode"); |
2292dd7a | 8726 | if (hint) |
8727 | { | |
e60a6f7b | 8728 | inform (loc, |
01e6cdb4 | 8729 | "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 " |
8730 | "to compile your code"); | |
2292dd7a | 8731 | hint = false; |
8732 | } | |
1e8e9920 | 8733 | return NULL_TREE; |
5e4f9988 | 8734 | } |
8735 | /* C99 subclause 6.8.5 paragraph 3: | |
8736 | ||
8737 | [#3] The declaration part of a for statement shall only | |
8738 | declare identifiers for objects having storage class auto or | |
8739 | register. | |
8740 | ||
8741 | It isn't clear whether, in this sentence, "identifiers" binds to | |
8742 | "shall only declare" or to "objects" - that is, whether all identifiers | |
8743 | declared must be identifiers for objects, or whether the restriction | |
8744 | only applies to those that are. (A question on this in comp.std.c | |
8745 | in November 2000 received no answer.) We implement the strictest | |
8746 | interpretation, to avoid creating an extension which later causes | |
8747 | problems. */ | |
8748 | ||
393b349a | 8749 | for (b = current_scope->bindings; b; b = b->prev) |
5e4f9988 | 8750 | { |
393b349a | 8751 | tree id = b->id; |
8752 | tree decl = b->decl; | |
1a5a5cd8 | 8753 | |
393b349a | 8754 | if (!id) |
8755 | continue; | |
8756 | ||
8757 | switch (TREE_CODE (decl)) | |
8758 | { | |
8759 | case VAR_DECL: | |
e60a6f7b | 8760 | { |
8761 | location_t decl_loc = DECL_SOURCE_LOCATION (decl); | |
8762 | if (TREE_STATIC (decl)) | |
8763 | error_at (decl_loc, | |
8764 | "declaration of static variable %qD in %<for%> loop " | |
8765 | "initial declaration", decl); | |
8766 | else if (DECL_EXTERNAL (decl)) | |
8767 | error_at (decl_loc, | |
8768 | "declaration of %<extern%> variable %qD in %<for%> loop " | |
8769 | "initial declaration", decl); | |
8770 | } | |
393b349a | 8771 | break; |
8772 | ||
8773 | case RECORD_TYPE: | |
e60a6f7b | 8774 | error_at (loc, |
8775 | "%<struct %E%> declared in %<for%> loop initial " | |
8776 | "declaration", id); | |
393b349a | 8777 | break; |
8778 | case UNION_TYPE: | |
e60a6f7b | 8779 | error_at (loc, |
8780 | "%<union %E%> declared in %<for%> loop initial declaration", | |
8781 | id); | |
393b349a | 8782 | break; |
8783 | case ENUMERAL_TYPE: | |
e60a6f7b | 8784 | error_at (loc, "%<enum %E%> declared in %<for%> loop " |
8785 | "initial declaration", id); | |
393b349a | 8786 | break; |
8787 | default: | |
e60a6f7b | 8788 | error_at (loc, "declaration of non-variable " |
8789 | "%qD in %<for%> loop initial declaration", decl); | |
393b349a | 8790 | } |
1e8e9920 | 8791 | |
8792 | n_decls++; | |
8793 | one_decl = decl; | |
5e4f9988 | 8794 | } |
1e8e9920 | 8795 | |
8796 | return n_decls == 1 ? one_decl : NULL_TREE; | |
5e4f9988 | 8797 | } |
8798 | \f | |
51ef3909 | 8799 | /* Save and reinitialize the variables |
8800 | used during compilation of a C function. */ | |
8801 | ||
8802 | void | |
d2764e2d | 8803 | c_push_function_context (void) |
51ef3909 | 8804 | { |
fd9cb2ca | 8805 | struct language_function *p = cfun->language; |
8806 | /* cfun->language might have been already allocated by the use of | |
8807 | -Wunused-local-typedefs. In that case, just re-use it. */ | |
8808 | if (p == NULL) | |
25a27413 | 8809 | cfun->language = p = ggc_cleared_alloc<language_function> (); |
51ef3909 | 8810 | |
e41f0d80 | 8811 | p->base.x_stmt_tree = c_stmt_tree; |
f1f41a6c | 8812 | c_stmt_tree.x_cur_stmt_list = vec_safe_copy (c_stmt_tree.x_cur_stmt_list); |
0375a275 | 8813 | p->x_break_label = c_break_label; |
8814 | p->x_cont_label = c_cont_label; | |
8815 | p->x_switch_stack = c_switch_stack; | |
731e6cbf | 8816 | p->arg_info = current_function_arg_info; |
51ef3909 | 8817 | p->returns_value = current_function_returns_value; |
8818 | p->returns_null = current_function_returns_null; | |
af857942 | 8819 | p->returns_abnormally = current_function_returns_abnormally; |
51ef3909 | 8820 | p->warn_about_return_type = warn_about_return_type; |
d2764e2d | 8821 | |
8822 | push_function_context (); | |
51ef3909 | 8823 | } |
8824 | ||
8825 | /* Restore the variables used during compilation of a C function. */ | |
8826 | ||
8827 | void | |
d2764e2d | 8828 | c_pop_function_context (void) |
51ef3909 | 8829 | { |
d2764e2d | 8830 | struct language_function *p; |
8831 | ||
8832 | pop_function_context (); | |
8833 | p = cfun->language; | |
fd9cb2ca | 8834 | |
8835 | /* When -Wunused-local-typedefs is in effect, cfun->languages is | |
8836 | used to store data throughout the life time of the current cfun, | |
8837 | So don't deallocate it. */ | |
8838 | if (!warn_unused_local_typedefs) | |
8839 | cfun->language = NULL; | |
51ef3909 | 8840 | |
cbc44df5 | 8841 | if (DECL_STRUCT_FUNCTION (current_function_decl) == 0 |
e41f0d80 | 8842 | && DECL_SAVED_TREE (current_function_decl) == NULL_TREE) |
51ef3909 | 8843 | { |
8844 | /* Stop pointing to the local nodes about to be freed. */ | |
8845 | /* But DECL_INITIAL must remain nonzero so we know this | |
8846 | was an actual function definition. */ | |
8847 | DECL_INITIAL (current_function_decl) = error_mark_node; | |
8848 | DECL_ARGUMENTS (current_function_decl) = 0; | |
8849 | } | |
8850 | ||
e41f0d80 | 8851 | c_stmt_tree = p->base.x_stmt_tree; |
fd9cb2ca | 8852 | p->base.x_stmt_tree.x_cur_stmt_list = NULL; |
0375a275 | 8853 | c_break_label = p->x_break_label; |
8854 | c_cont_label = p->x_cont_label; | |
8855 | c_switch_stack = p->x_switch_stack; | |
731e6cbf | 8856 | current_function_arg_info = p->arg_info; |
51ef3909 | 8857 | current_function_returns_value = p->returns_value; |
8858 | current_function_returns_null = p->returns_null; | |
af857942 | 8859 | current_function_returns_abnormally = p->returns_abnormally; |
51ef3909 | 8860 | warn_about_return_type = p->warn_about_return_type; |
dc12af01 | 8861 | } |
8862 | ||
5c3247a9 | 8863 | /* The functions below are required for functionality of doing |
8864 | function at once processing in the C front end. Currently these | |
8865 | functions are not called from anywhere in the C front end, but as | |
4214af46 | 8866 | these changes continue, that will change. */ |
5c3247a9 | 8867 | |
a08e60ae | 8868 | /* Returns the stmt_tree (if any) to which statements are currently |
8869 | being added. If there is no active statement-tree, NULL is | |
8870 | returned. */ | |
8871 | ||
8872 | stmt_tree | |
1cae46be | 8873 | current_stmt_tree (void) |
a08e60ae | 8874 | { |
e41f0d80 | 8875 | return &c_stmt_tree; |
8876 | } | |
8877 | ||
31ddae9f | 8878 | /* Return the global value of T as a symbol. */ |
6bf5ed8d | 8879 | |
8880 | tree | |
1cae46be | 8881 | identifier_global_value (tree t) |
6bf5ed8d | 8882 | { |
393b349a | 8883 | struct c_binding *b; |
31ddae9f | 8884 | |
393b349a | 8885 | for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed) |
4194491a | 8886 | if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b)) |
393b349a | 8887 | return b->decl; |
31ddae9f | 8888 | |
31ddae9f | 8889 | return 0; |
6bf5ed8d | 8890 | } |
174fcc61 | 8891 | |
27282252 | 8892 | /* In C, the only C-linkage public declaration is at file scope. */ |
8893 | ||
8894 | tree | |
8895 | c_linkage_bindings (tree name) | |
8896 | { | |
8897 | return identifier_global_value (name); | |
8898 | } | |
8899 | ||
174fcc61 | 8900 | /* Record a builtin type for C. If NAME is non-NULL, it is the name used; |
8901 | otherwise the name is found in ridpointers from RID_INDEX. */ | |
8902 | ||
8903 | void | |
1cae46be | 8904 | record_builtin_type (enum rid rid_index, const char *name, tree type) |
174fcc61 | 8905 | { |
f62468fc | 8906 | tree id, decl; |
174fcc61 | 8907 | if (name == 0) |
8908 | id = ridpointers[(int) rid_index]; | |
8909 | else | |
8910 | id = get_identifier (name); | |
e60a6f7b | 8911 | decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type); |
f62468fc | 8912 | pushdecl (decl); |
8913 | if (debug_hooks->type_decl) | |
8914 | debug_hooks->type_decl (decl, false); | |
174fcc61 | 8915 | } |
8916 | ||
8917 | /* Build the void_list_node (void_type_node having been created). */ | |
8918 | tree | |
1cae46be | 8919 | build_void_list_node (void) |
174fcc61 | 8920 | { |
8921 | tree t = build_tree_list (NULL_TREE, void_type_node); | |
8922 | return t; | |
8923 | } | |
90cc7820 | 8924 | |
ac206aff | 8925 | /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */ |
0a423af5 | 8926 | |
ac206aff | 8927 | struct c_parm * |
9553111d | 8928 | build_c_parm (struct c_declspecs *specs, tree attrs, |
8929 | struct c_declarator *declarator) | |
0a423af5 | 8930 | { |
ac206aff | 8931 | struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm); |
8932 | ret->specs = specs; | |
8933 | ret->attrs = attrs; | |
8934 | ret->declarator = declarator; | |
8935 | return ret; | |
0a423af5 | 8936 | } |
8937 | ||
8938 | /* Return a declarator with nested attributes. TARGET is the inner | |
8939 | declarator to which these attributes apply. ATTRS are the | |
8940 | attributes. */ | |
8941 | ||
ac206aff | 8942 | struct c_declarator * |
8943 | build_attrs_declarator (tree attrs, struct c_declarator *target) | |
0a423af5 | 8944 | { |
ac206aff | 8945 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); |
8946 | ret->kind = cdk_attrs; | |
8947 | ret->declarator = target; | |
8948 | ret->u.attrs = attrs; | |
8949 | return ret; | |
0a423af5 | 8950 | } |
8951 | ||
8952 | /* Return a declarator for a function with arguments specified by ARGS | |
8953 | and return type specified by TARGET. */ | |
8954 | ||
ac206aff | 8955 | struct c_declarator * |
8956 | build_function_declarator (struct c_arg_info *args, | |
8957 | struct c_declarator *target) | |
0a423af5 | 8958 | { |
ac206aff | 8959 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); |
8960 | ret->kind = cdk_function; | |
8961 | ret->declarator = target; | |
8962 | ret->u.arg_info = args; | |
8963 | return ret; | |
8964 | } | |
8965 | ||
8966 | /* Return a declarator for the identifier IDENT (which may be | |
8967 | NULL_TREE for an abstract declarator). */ | |
8968 | ||
8969 | struct c_declarator * | |
8970 | build_id_declarator (tree ident) | |
8971 | { | |
8972 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); | |
8973 | ret->kind = cdk_id; | |
8974 | ret->declarator = 0; | |
8975 | ret->u.id = ident; | |
6342afac | 8976 | /* Default value - may get reset to a more precise location. */ |
8977 | ret->id_loc = input_location; | |
ac206aff | 8978 | return ret; |
0a423af5 | 8979 | } |
8980 | ||
90cc7820 | 8981 | /* Return something to represent absolute declarators containing a *. |
8982 | TARGET is the absolute declarator that the * contains. | |
9553111d | 8983 | TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes |
8984 | to apply to the pointer type. */ | |
90cc7820 | 8985 | |
ac206aff | 8986 | struct c_declarator * |
9553111d | 8987 | make_pointer_declarator (struct c_declspecs *type_quals_attrs, |
8988 | struct c_declarator *target) | |
90cc7820 | 8989 | { |
9553111d | 8990 | tree attrs; |
bb476216 | 8991 | int quals = 0; |
ac206aff | 8992 | struct c_declarator *itarget = target; |
8993 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); | |
9553111d | 8994 | if (type_quals_attrs) |
8995 | { | |
8996 | attrs = type_quals_attrs->attrs; | |
bb476216 | 8997 | quals = quals_from_declspecs (type_quals_attrs); |
9553111d | 8998 | if (attrs != NULL_TREE) |
8999 | itarget = build_attrs_declarator (attrs, target); | |
9000 | } | |
ac206aff | 9001 | ret->kind = cdk_pointer; |
9002 | ret->declarator = itarget; | |
bb476216 | 9003 | ret->u.pointer_quals = quals; |
9553111d | 9004 | return ret; |
9005 | } | |
9006 | ||
9007 | /* Return a pointer to a structure for an empty list of declaration | |
9008 | specifiers. */ | |
9009 | ||
9010 | struct c_declspecs * | |
9011 | build_null_declspecs (void) | |
9012 | { | |
9013 | struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs); | |
a60f3e81 | 9014 | memset (&ret->locations, 0, cdw_number_of_elements); |
9553111d | 9015 | ret->type = 0; |
a75b1c71 | 9016 | ret->expr = 0; |
9553111d | 9017 | ret->decl_attr = 0; |
9018 | ret->attrs = 0; | |
83e25171 | 9019 | ret->align_log = -1; |
70dd11f7 | 9020 | ret->typespec_word = cts_none; |
feb04535 | 9021 | ret->storage_class = csc_none; |
a75b1c71 | 9022 | ret->expr_const_operands = true; |
1576dec7 | 9023 | ret->declspecs_seen_p = false; |
ae5ead32 | 9024 | ret->typespec_kind = ctsk_none; |
9553111d | 9025 | ret->non_sc_seen_p = false; |
490eec42 | 9026 | ret->typedef_p = false; |
70dd11f7 | 9027 | ret->explicit_signed_p = false; |
9553111d | 9028 | ret->deprecated_p = false; |
70dd11f7 | 9029 | ret->default_int_p = false; |
9030 | ret->long_p = false; | |
9553111d | 9031 | ret->long_long_p = false; |
70dd11f7 | 9032 | ret->short_p = false; |
9033 | ret->signed_p = false; | |
9034 | ret->unsigned_p = false; | |
9035 | ret->complex_p = false; | |
feb04535 | 9036 | ret->inline_p = false; |
985c6e3a | 9037 | ret->noreturn_p = false; |
feb04535 | 9038 | ret->thread_p = false; |
d184e0c0 | 9039 | ret->thread_gnu_p = false; |
bb476216 | 9040 | ret->const_p = false; |
9041 | ret->volatile_p = false; | |
b560fabd | 9042 | ret->atomic_p = false; |
bb476216 | 9043 | ret->restrict_p = false; |
9421ebb9 | 9044 | ret->saturating_p = false; |
83e25171 | 9045 | ret->alignas_p = false; |
6d5d708e | 9046 | ret->address_space = ADDR_SPACE_GENERIC; |
ac206aff | 9047 | return ret; |
90cc7820 | 9048 | } |
1f3233d1 | 9049 | |
6d5d708e | 9050 | /* Add the address space ADDRSPACE to the declaration specifiers |
9051 | SPECS, returning SPECS. */ | |
9052 | ||
9053 | struct c_declspecs * | |
a60f3e81 | 9054 | declspecs_add_addrspace (source_location location, |
9055 | struct c_declspecs *specs, addr_space_t as) | |
6d5d708e | 9056 | { |
9057 | specs->non_sc_seen_p = true; | |
9058 | specs->declspecs_seen_p = true; | |
9059 | ||
9060 | if (!ADDR_SPACE_GENERIC_P (specs->address_space) | |
9061 | && specs->address_space != as) | |
9062 | error ("incompatible address space qualifiers %qs and %qs", | |
9063 | c_addr_space_name (as), | |
9064 | c_addr_space_name (specs->address_space)); | |
9065 | else | |
a60f3e81 | 9066 | { |
9067 | specs->address_space = as; | |
9068 | specs->locations[cdw_address_space] = location; | |
9069 | } | |
6d5d708e | 9070 | return specs; |
9071 | } | |
9072 | ||
9553111d | 9073 | /* Add the type qualifier QUAL to the declaration specifiers SPECS, |
9074 | returning SPECS. */ | |
9075 | ||
9076 | struct c_declspecs * | |
a60f3e81 | 9077 | declspecs_add_qual (source_location loc, |
9078 | struct c_declspecs *specs, tree qual) | |
9553111d | 9079 | { |
9080 | enum rid i; | |
bb476216 | 9081 | bool dupe = false; |
9553111d | 9082 | specs->non_sc_seen_p = true; |
1576dec7 | 9083 | specs->declspecs_seen_p = true; |
9553111d | 9084 | gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE |
9085 | && C_IS_RESERVED_WORD (qual)); | |
9086 | i = C_RID_CODE (qual); | |
bb476216 | 9087 | switch (i) |
9088 | { | |
9089 | case RID_CONST: | |
9090 | dupe = specs->const_p; | |
9091 | specs->const_p = true; | |
a60f3e81 | 9092 | specs->locations[cdw_const] = loc; |
bb476216 | 9093 | break; |
9094 | case RID_VOLATILE: | |
9095 | dupe = specs->volatile_p; | |
9096 | specs->volatile_p = true; | |
a60f3e81 | 9097 | specs->locations[cdw_volatile] = loc; |
bb476216 | 9098 | break; |
9099 | case RID_RESTRICT: | |
9100 | dupe = specs->restrict_p; | |
9101 | specs->restrict_p = true; | |
a60f3e81 | 9102 | specs->locations[cdw_restrict] = loc; |
bb476216 | 9103 | break; |
b560fabd | 9104 | case RID_ATOMIC: |
9105 | dupe = specs->atomic_p; | |
9106 | specs->atomic_p = true; | |
9107 | break; | |
bb476216 | 9108 | default: |
9109 | gcc_unreachable (); | |
9110 | } | |
890c2e2f | 9111 | if (dupe) |
9112 | pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %qE", qual); | |
9553111d | 9113 | return specs; |
9114 | } | |
9115 | ||
9116 | /* Add the type specifier TYPE to the declaration specifiers SPECS, | |
9117 | returning SPECS. */ | |
9118 | ||
9119 | struct c_declspecs * | |
843bd2fa | 9120 | declspecs_add_type (location_t loc, struct c_declspecs *specs, |
9121 | struct c_typespec spec) | |
9553111d | 9122 | { |
19702c1d | 9123 | tree type = spec.spec; |
9553111d | 9124 | specs->non_sc_seen_p = true; |
1576dec7 | 9125 | specs->declspecs_seen_p = true; |
ae5ead32 | 9126 | specs->typespec_kind = spec.kind; |
9553111d | 9127 | if (TREE_DEPRECATED (type)) |
9128 | specs->deprecated_p = true; | |
9553111d | 9129 | |
70dd11f7 | 9130 | /* Handle type specifier keywords. */ |
5c6e5756 | 9131 | if (TREE_CODE (type) == IDENTIFIER_NODE |
9132 | && C_IS_RESERVED_WORD (type) | |
9133 | && C_RID_CODE (type) != RID_CXX_COMPAT_WARN) | |
9553111d | 9134 | { |
9135 | enum rid i = C_RID_CODE (type); | |
70dd11f7 | 9136 | if (specs->type) |
9137 | { | |
843bd2fa | 9138 | error_at (loc, "two or more data types in declaration specifiers"); |
70dd11f7 | 9139 | return specs; |
9140 | } | |
9553111d | 9141 | if ((int) i <= (int) RID_LAST_MODIFIER) |
9142 | { | |
9421ebb9 | 9143 | /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */ |
70dd11f7 | 9144 | bool dupe = false; |
9145 | switch (i) | |
9553111d | 9146 | { |
70dd11f7 | 9147 | case RID_LONG: |
9553111d | 9148 | if (specs->long_long_p) |
9553111d | 9149 | { |
843bd2fa | 9150 | error_at (loc, "%<long long long%> is too long for GCC"); |
70dd11f7 | 9151 | break; |
9152 | } | |
9153 | if (specs->long_p) | |
9154 | { | |
9155 | if (specs->typespec_word == cts_double) | |
9156 | { | |
843bd2fa | 9157 | error_at (loc, |
9158 | ("both %<long long%> and %<double%> in " | |
9159 | "declaration specifiers")); | |
70dd11f7 | 9160 | break; |
9161 | } | |
843bd2fa | 9162 | pedwarn_c90 (loc, OPT_Wlong_long, |
9ab71c6b | 9163 | "ISO C90 does not support %<long long%>"); |
9553111d | 9164 | specs->long_long_p = 1; |
a60f3e81 | 9165 | specs->locations[cdw_long_long] = loc; |
70dd11f7 | 9166 | break; |
9553111d | 9167 | } |
70dd11f7 | 9168 | if (specs->short_p) |
843bd2fa | 9169 | error_at (loc, |
9170 | ("both %<long%> and %<short%> in " | |
9171 | "declaration specifiers")); | |
4fba5eb9 | 9172 | else if (specs->typespec_word == cts_auto_type) |
9173 | error_at (loc, | |
9174 | ("both %<long%> and %<__auto_type%> in " | |
9175 | "declaration specifiers")); | |
70dd11f7 | 9176 | else if (specs->typespec_word == cts_void) |
843bd2fa | 9177 | error_at (loc, |
9178 | ("both %<long%> and %<void%> in " | |
9179 | "declaration specifiers")); | |
6388cfe2 | 9180 | else if (specs->typespec_word == cts_int128) |
9181 | error_at (loc, | |
9182 | ("both %<long%> and %<__int128%> in " | |
9183 | "declaration specifiers")); | |
70dd11f7 | 9184 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 9185 | error_at (loc, |
9186 | ("both %<long%> and %<_Bool%> in " | |
9187 | "declaration specifiers")); | |
70dd11f7 | 9188 | else if (specs->typespec_word == cts_char) |
843bd2fa | 9189 | error_at (loc, |
9190 | ("both %<long%> and %<char%> in " | |
9191 | "declaration specifiers")); | |
70dd11f7 | 9192 | else if (specs->typespec_word == cts_float) |
843bd2fa | 9193 | error_at (loc, |
9194 | ("both %<long%> and %<float%> in " | |
9195 | "declaration specifiers")); | |
c4503c0a | 9196 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 9197 | error_at (loc, |
9198 | ("both %<long%> and %<_Decimal32%> in " | |
9199 | "declaration specifiers")); | |
c4503c0a | 9200 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 9201 | error_at (loc, |
9202 | ("both %<long%> and %<_Decimal64%> in " | |
9203 | "declaration specifiers")); | |
c4503c0a | 9204 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 9205 | error_at (loc, |
9206 | ("both %<long%> and %<_Decimal128%> in " | |
9207 | "declaration specifiers")); | |
70dd11f7 | 9208 | else |
a60f3e81 | 9209 | { |
9210 | specs->long_p = true; | |
9211 | specs->locations[cdw_long] = loc; | |
9212 | } | |
70dd11f7 | 9213 | break; |
9214 | case RID_SHORT: | |
9215 | dupe = specs->short_p; | |
9216 | if (specs->long_p) | |
843bd2fa | 9217 | error_at (loc, |
9218 | ("both %<long%> and %<short%> in " | |
9219 | "declaration specifiers")); | |
4fba5eb9 | 9220 | else if (specs->typespec_word == cts_auto_type) |
9221 | error_at (loc, | |
9222 | ("both %<short%> and %<__auto_type%> in " | |
9223 | "declaration specifiers")); | |
70dd11f7 | 9224 | else if (specs->typespec_word == cts_void) |
843bd2fa | 9225 | error_at (loc, |
9226 | ("both %<short%> and %<void%> in " | |
9227 | "declaration specifiers")); | |
6388cfe2 | 9228 | else if (specs->typespec_word == cts_int128) |
9229 | error_at (loc, | |
9230 | ("both %<short%> and %<__int128%> in " | |
9231 | "declaration specifiers")); | |
70dd11f7 | 9232 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 9233 | error_at (loc, |
9234 | ("both %<short%> and %<_Bool%> in " | |
9235 | "declaration specifiers")); | |
70dd11f7 | 9236 | else if (specs->typespec_word == cts_char) |
843bd2fa | 9237 | error_at (loc, |
9238 | ("both %<short%> and %<char%> in " | |
9239 | "declaration specifiers")); | |
70dd11f7 | 9240 | else if (specs->typespec_word == cts_float) |
843bd2fa | 9241 | error_at (loc, |
9242 | ("both %<short%> and %<float%> in " | |
9243 | "declaration specifiers")); | |
70dd11f7 | 9244 | else if (specs->typespec_word == cts_double) |
843bd2fa | 9245 | error_at (loc, |
9246 | ("both %<short%> and %<double%> in " | |
9247 | "declaration specifiers")); | |
c4503c0a | 9248 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 9249 | error_at (loc, |
9250 | ("both %<short%> and %<_Decimal32%> in " | |
9251 | "declaration specifiers")); | |
c4503c0a | 9252 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 9253 | error_at (loc, |
9254 | ("both %<short%> and %<_Decimal64%> in " | |
9255 | "declaration specifiers")); | |
c4503c0a | 9256 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 9257 | error_at (loc, |
9258 | ("both %<short%> and %<_Decimal128%> in " | |
9259 | "declaration specifiers")); | |
70dd11f7 | 9260 | else |
a60f3e81 | 9261 | { |
9262 | specs->short_p = true; | |
9263 | specs->locations[cdw_short] = loc; | |
9264 | } | |
70dd11f7 | 9265 | break; |
9266 | case RID_SIGNED: | |
9267 | dupe = specs->signed_p; | |
9268 | if (specs->unsigned_p) | |
843bd2fa | 9269 | error_at (loc, |
9270 | ("both %<signed%> and %<unsigned%> in " | |
9271 | "declaration specifiers")); | |
4fba5eb9 | 9272 | else if (specs->typespec_word == cts_auto_type) |
9273 | error_at (loc, | |
9274 | ("both %<signed%> and %<__auto_type%> in " | |
9275 | "declaration specifiers")); | |
70dd11f7 | 9276 | else if (specs->typespec_word == cts_void) |
843bd2fa | 9277 | error_at (loc, |
9278 | ("both %<signed%> and %<void%> in " | |
9279 | "declaration specifiers")); | |
70dd11f7 | 9280 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 9281 | error_at (loc, |
9282 | ("both %<signed%> and %<_Bool%> in " | |
9283 | "declaration specifiers")); | |
70dd11f7 | 9284 | else if (specs->typespec_word == cts_float) |
843bd2fa | 9285 | error_at (loc, |
9286 | ("both %<signed%> and %<float%> in " | |
9287 | "declaration specifiers")); | |
70dd11f7 | 9288 | else if (specs->typespec_word == cts_double) |
843bd2fa | 9289 | error_at (loc, |
9290 | ("both %<signed%> and %<double%> in " | |
9291 | "declaration specifiers")); | |
c4503c0a | 9292 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 9293 | error_at (loc, |
9294 | ("both %<signed%> and %<_Decimal32%> in " | |
9295 | "declaration specifiers")); | |
c4503c0a | 9296 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 9297 | error_at (loc, |
9298 | ("both %<signed%> and %<_Decimal64%> in " | |
9299 | "declaration specifiers")); | |
c4503c0a | 9300 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 9301 | error_at (loc, |
9302 | ("both %<signed%> and %<_Decimal128%> in " | |
9303 | "declaration specifiers")); | |
70dd11f7 | 9304 | else |
a60f3e81 | 9305 | { |
9306 | specs->signed_p = true; | |
9307 | specs->locations[cdw_signed] = loc; | |
9308 | } | |
70dd11f7 | 9309 | break; |
9310 | case RID_UNSIGNED: | |
9311 | dupe = specs->unsigned_p; | |
9312 | if (specs->signed_p) | |
843bd2fa | 9313 | error_at (loc, |
9314 | ("both %<signed%> and %<unsigned%> in " | |
9315 | "declaration specifiers")); | |
4fba5eb9 | 9316 | else if (specs->typespec_word == cts_auto_type) |
9317 | error_at (loc, | |
9318 | ("both %<unsigned%> and %<__auto_type%> in " | |
9319 | "declaration specifiers")); | |
70dd11f7 | 9320 | else if (specs->typespec_word == cts_void) |
843bd2fa | 9321 | error_at (loc, |
9322 | ("both %<unsigned%> and %<void%> in " | |
9323 | "declaration specifiers")); | |
70dd11f7 | 9324 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 9325 | error_at (loc, |
9326 | ("both %<unsigned%> and %<_Bool%> in " | |
9327 | "declaration specifiers")); | |
70dd11f7 | 9328 | else if (specs->typespec_word == cts_float) |
843bd2fa | 9329 | error_at (loc, |
9330 | ("both %<unsigned%> and %<float%> in " | |
9331 | "declaration specifiers")); | |
70dd11f7 | 9332 | else if (specs->typespec_word == cts_double) |
843bd2fa | 9333 | error_at (loc, |
9334 | ("both %<unsigned%> and %<double%> in " | |
9335 | "declaration specifiers")); | |
c4503c0a | 9336 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 9337 | error_at (loc, |
9338 | ("both %<unsigned%> and %<_Decimal32%> in " | |
9339 | "declaration specifiers")); | |
c4503c0a | 9340 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 9341 | error_at (loc, |
9342 | ("both %<unsigned%> and %<_Decimal64%> in " | |
9343 | "declaration specifiers")); | |
c4503c0a | 9344 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 9345 | error_at (loc, |
9346 | ("both %<unsigned%> and %<_Decimal128%> in " | |
9347 | "declaration specifiers")); | |
70dd11f7 | 9348 | else |
a60f3e81 | 9349 | { |
9350 | specs->unsigned_p = true; | |
9351 | specs->locations[cdw_unsigned] = loc; | |
9352 | } | |
70dd11f7 | 9353 | break; |
9354 | case RID_COMPLEX: | |
9355 | dupe = specs->complex_p; | |
890c2e2f | 9356 | if (!in_system_header_at (loc)) |
9357 | pedwarn_c90 (loc, OPT_Wpedantic, | |
9358 | "ISO C90 does not support complex types"); | |
4fba5eb9 | 9359 | if (specs->typespec_word == cts_auto_type) |
9360 | error_at (loc, | |
9361 | ("both %<complex%> and %<__auto_type%> in " | |
9362 | "declaration specifiers")); | |
9363 | else if (specs->typespec_word == cts_void) | |
843bd2fa | 9364 | error_at (loc, |
9365 | ("both %<complex%> and %<void%> in " | |
9366 | "declaration specifiers")); | |
70dd11f7 | 9367 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 9368 | error_at (loc, |
9369 | ("both %<complex%> and %<_Bool%> in " | |
9370 | "declaration specifiers")); | |
c4503c0a | 9371 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 9372 | error_at (loc, |
9373 | ("both %<complex%> and %<_Decimal32%> in " | |
9374 | "declaration specifiers")); | |
c4503c0a | 9375 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 9376 | error_at (loc, |
9377 | ("both %<complex%> and %<_Decimal64%> in " | |
9378 | "declaration specifiers")); | |
c4503c0a | 9379 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 9380 | error_at (loc, |
9381 | ("both %<complex%> and %<_Decimal128%> in " | |
9382 | "declaration specifiers")); | |
9421ebb9 | 9383 | else if (specs->typespec_word == cts_fract) |
843bd2fa | 9384 | error_at (loc, |
9385 | ("both %<complex%> and %<_Fract%> in " | |
9386 | "declaration specifiers")); | |
9421ebb9 | 9387 | else if (specs->typespec_word == cts_accum) |
843bd2fa | 9388 | error_at (loc, |
9389 | ("both %<complex%> and %<_Accum%> in " | |
9390 | "declaration specifiers")); | |
9421ebb9 | 9391 | else if (specs->saturating_p) |
843bd2fa | 9392 | error_at (loc, |
9393 | ("both %<complex%> and %<_Sat%> in " | |
9394 | "declaration specifiers")); | |
70dd11f7 | 9395 | else |
a60f3e81 | 9396 | { |
9397 | specs->complex_p = true; | |
9398 | specs->locations[cdw_complex] = loc; | |
9399 | } | |
70dd11f7 | 9400 | break; |
9421ebb9 | 9401 | case RID_SAT: |
9402 | dupe = specs->saturating_p; | |
29438999 | 9403 | pedwarn (loc, OPT_Wpedantic, |
843bd2fa | 9404 | "ISO C does not support saturating types"); |
6388cfe2 | 9405 | if (specs->typespec_word == cts_int128) |
9406 | { | |
9407 | error_at (loc, | |
9408 | ("both %<_Sat%> and %<__int128%> in " | |
9409 | "declaration specifiers")); | |
9410 | } | |
4fba5eb9 | 9411 | else if (specs->typespec_word == cts_auto_type) |
9412 | error_at (loc, | |
9413 | ("both %<_Sat%> and %<__auto_type%> in " | |
9414 | "declaration specifiers")); | |
6388cfe2 | 9415 | else if (specs->typespec_word == cts_void) |
843bd2fa | 9416 | error_at (loc, |
9417 | ("both %<_Sat%> and %<void%> in " | |
9418 | "declaration specifiers")); | |
9421ebb9 | 9419 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 9420 | error_at (loc, |
9421 | ("both %<_Sat%> and %<_Bool%> in " | |
9422 | "declaration specifiers")); | |
9421ebb9 | 9423 | else if (specs->typespec_word == cts_char) |
843bd2fa | 9424 | error_at (loc, |
9425 | ("both %<_Sat%> and %<char%> in " | |
9426 | "declaration specifiers")); | |
9421ebb9 | 9427 | else if (specs->typespec_word == cts_int) |
843bd2fa | 9428 | error_at (loc, |
9429 | ("both %<_Sat%> and %<int%> in " | |
9430 | "declaration specifiers")); | |
9421ebb9 | 9431 | else if (specs->typespec_word == cts_float) |
843bd2fa | 9432 | error_at (loc, |
9433 | ("both %<_Sat%> and %<float%> in " | |
9434 | "declaration specifiers")); | |
9421ebb9 | 9435 | else if (specs->typespec_word == cts_double) |
843bd2fa | 9436 | error_at (loc, |
9437 | ("both %<_Sat%> and %<double%> in " | |
9438 | "declaration specifiers")); | |
9421ebb9 | 9439 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 9440 | error_at (loc, |
9441 | ("both %<_Sat%> and %<_Decimal32%> in " | |
9442 | "declaration specifiers")); | |
9421ebb9 | 9443 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 9444 | error_at (loc, |
9445 | ("both %<_Sat%> and %<_Decimal64%> in " | |
9446 | "declaration specifiers")); | |
9421ebb9 | 9447 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 9448 | error_at (loc, |
9449 | ("both %<_Sat%> and %<_Decimal128%> in " | |
9450 | "declaration specifiers")); | |
9421ebb9 | 9451 | else if (specs->complex_p) |
843bd2fa | 9452 | error_at (loc, |
9453 | ("both %<_Sat%> and %<complex%> in " | |
9454 | "declaration specifiers")); | |
9421ebb9 | 9455 | else |
a60f3e81 | 9456 | { |
9457 | specs->saturating_p = true; | |
9458 | specs->locations[cdw_saturating] = loc; | |
9459 | } | |
9421ebb9 | 9460 | break; |
70dd11f7 | 9461 | default: |
9462 | gcc_unreachable (); | |
9553111d | 9463 | } |
70dd11f7 | 9464 | |
9465 | if (dupe) | |
843bd2fa | 9466 | error_at (loc, "duplicate %qE", type); |
9553111d | 9467 | |
9553111d | 9468 | return specs; |
9469 | } | |
70dd11f7 | 9470 | else |
9471 | { | |
9421ebb9 | 9472 | /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32", |
4fba5eb9 | 9473 | "__int128", "_Decimal64", "_Decimal128", "_Fract", "_Accum" or |
9474 | "__auto_type". */ | |
70dd11f7 | 9475 | if (specs->typespec_word != cts_none) |
9476 | { | |
843bd2fa | 9477 | error_at (loc, |
9478 | "two or more data types in declaration specifiers"); | |
70dd11f7 | 9479 | return specs; |
9480 | } | |
9481 | switch (i) | |
9482 | { | |
4fba5eb9 | 9483 | case RID_AUTO_TYPE: |
9484 | if (specs->long_p) | |
9485 | error_at (loc, | |
9486 | ("both %<long%> and %<__auto_type%> in " | |
9487 | "declaration specifiers")); | |
9488 | else if (specs->short_p) | |
9489 | error_at (loc, | |
9490 | ("both %<short%> and %<__auto_type%> in " | |
9491 | "declaration specifiers")); | |
9492 | else if (specs->signed_p) | |
9493 | error_at (loc, | |
9494 | ("both %<signed%> and %<__auto_type%> in " | |
9495 | "declaration specifiers")); | |
9496 | else if (specs->unsigned_p) | |
9497 | error_at (loc, | |
9498 | ("both %<unsigned%> and %<__auto_type%> in " | |
9499 | "declaration specifiers")); | |
9500 | else if (specs->complex_p) | |
9501 | error_at (loc, | |
9502 | ("both %<complex%> and %<__auto_type%> in " | |
9503 | "declaration specifiers")); | |
9504 | else if (specs->saturating_p) | |
9505 | error_at (loc, | |
9506 | ("both %<_Sat%> and %<__auto_type%> in " | |
9507 | "declaration specifiers")); | |
9508 | else | |
9509 | { | |
9510 | specs->typespec_word = cts_auto_type; | |
9511 | specs->locations[cdw_typespec] = loc; | |
9512 | } | |
9513 | return specs; | |
6388cfe2 | 9514 | case RID_INT128: |
9515 | if (int128_integer_type_node == NULL_TREE) | |
9516 | { | |
9517 | error_at (loc, "%<__int128%> is not supported for this target"); | |
9518 | return specs; | |
9519 | } | |
3df42822 | 9520 | if (!in_system_header_at (input_location)) |
29438999 | 9521 | pedwarn (loc, OPT_Wpedantic, |
6388cfe2 | 9522 | "ISO C does not support %<__int128%> type"); |
9523 | ||
9524 | if (specs->long_p) | |
9525 | error_at (loc, | |
9526 | ("both %<__int128%> and %<long%> in " | |
9527 | "declaration specifiers")); | |
9528 | else if (specs->saturating_p) | |
9529 | error_at (loc, | |
9530 | ("both %<_Sat%> and %<__int128%> in " | |
9531 | "declaration specifiers")); | |
9532 | else if (specs->short_p) | |
9533 | error_at (loc, | |
9534 | ("both %<__int128%> and %<short%> in " | |
9535 | "declaration specifiers")); | |
9536 | else | |
a60f3e81 | 9537 | { |
9538 | specs->typespec_word = cts_int128; | |
9539 | specs->locations[cdw_typespec] = loc; | |
9540 | } | |
6388cfe2 | 9541 | return specs; |
70dd11f7 | 9542 | case RID_VOID: |
9543 | if (specs->long_p) | |
843bd2fa | 9544 | error_at (loc, |
9545 | ("both %<long%> and %<void%> in " | |
9546 | "declaration specifiers")); | |
70dd11f7 | 9547 | else if (specs->short_p) |
843bd2fa | 9548 | error_at (loc, |
9549 | ("both %<short%> and %<void%> in " | |
9550 | "declaration specifiers")); | |
70dd11f7 | 9551 | else if (specs->signed_p) |
843bd2fa | 9552 | error_at (loc, |
9553 | ("both %<signed%> and %<void%> in " | |
9554 | "declaration specifiers")); | |
70dd11f7 | 9555 | else if (specs->unsigned_p) |
843bd2fa | 9556 | error_at (loc, |
9557 | ("both %<unsigned%> and %<void%> in " | |
9558 | "declaration specifiers")); | |
70dd11f7 | 9559 | else if (specs->complex_p) |
843bd2fa | 9560 | error_at (loc, |
9561 | ("both %<complex%> and %<void%> in " | |
9562 | "declaration specifiers")); | |
9421ebb9 | 9563 | else if (specs->saturating_p) |
843bd2fa | 9564 | error_at (loc, |
9565 | ("both %<_Sat%> and %<void%> in " | |
9566 | "declaration specifiers")); | |
70dd11f7 | 9567 | else |
a60f3e81 | 9568 | { |
9569 | specs->typespec_word = cts_void; | |
9570 | specs->locations[cdw_typespec] = loc; | |
9571 | } | |
70dd11f7 | 9572 | return specs; |
9573 | case RID_BOOL: | |
890c2e2f | 9574 | if (!in_system_header_at (loc)) |
9575 | pedwarn_c90 (loc, OPT_Wpedantic, | |
9576 | "ISO C90 does not support boolean types"); | |
70dd11f7 | 9577 | if (specs->long_p) |
843bd2fa | 9578 | error_at (loc, |
9579 | ("both %<long%> and %<_Bool%> in " | |
9580 | "declaration specifiers")); | |
70dd11f7 | 9581 | else if (specs->short_p) |
843bd2fa | 9582 | error_at (loc, |
9583 | ("both %<short%> and %<_Bool%> in " | |
9584 | "declaration specifiers")); | |
70dd11f7 | 9585 | else if (specs->signed_p) |
843bd2fa | 9586 | error_at (loc, |
9587 | ("both %<signed%> and %<_Bool%> in " | |
9588 | "declaration specifiers")); | |
70dd11f7 | 9589 | else if (specs->unsigned_p) |
843bd2fa | 9590 | error_at (loc, |
9591 | ("both %<unsigned%> and %<_Bool%> in " | |
9592 | "declaration specifiers")); | |
70dd11f7 | 9593 | else if (specs->complex_p) |
843bd2fa | 9594 | error_at (loc, |
9595 | ("both %<complex%> and %<_Bool%> in " | |
9596 | "declaration specifiers")); | |
9421ebb9 | 9597 | else if (specs->saturating_p) |
843bd2fa | 9598 | error_at (loc, |
9599 | ("both %<_Sat%> and %<_Bool%> in " | |
9600 | "declaration specifiers")); | |
70dd11f7 | 9601 | else |
a60f3e81 | 9602 | { |
9603 | specs->typespec_word = cts_bool; | |
9604 | specs->locations[cdw_typespec] = loc; | |
9605 | } | |
70dd11f7 | 9606 | return specs; |
9607 | case RID_CHAR: | |
9608 | if (specs->long_p) | |
843bd2fa | 9609 | error_at (loc, |
9610 | ("both %<long%> and %<char%> in " | |
9611 | "declaration specifiers")); | |
70dd11f7 | 9612 | else if (specs->short_p) |
843bd2fa | 9613 | error_at (loc, |
9614 | ("both %<short%> and %<char%> in " | |
9615 | "declaration specifiers")); | |
9421ebb9 | 9616 | else if (specs->saturating_p) |
843bd2fa | 9617 | error_at (loc, |
9618 | ("both %<_Sat%> and %<char%> in " | |
9619 | "declaration specifiers")); | |
70dd11f7 | 9620 | else |
a60f3e81 | 9621 | { |
9622 | specs->typespec_word = cts_char; | |
9623 | specs->locations[cdw_typespec] = loc; | |
9624 | } | |
70dd11f7 | 9625 | return specs; |
9626 | case RID_INT: | |
9421ebb9 | 9627 | if (specs->saturating_p) |
843bd2fa | 9628 | error_at (loc, |
9629 | ("both %<_Sat%> and %<int%> in " | |
9630 | "declaration specifiers")); | |
9421ebb9 | 9631 | else |
a60f3e81 | 9632 | { |
9633 | specs->typespec_word = cts_int; | |
9634 | specs->locations[cdw_typespec] = loc; | |
9635 | } | |
70dd11f7 | 9636 | return specs; |
9637 | case RID_FLOAT: | |
9638 | if (specs->long_p) | |
843bd2fa | 9639 | error_at (loc, |
9640 | ("both %<long%> and %<float%> in " | |
9641 | "declaration specifiers")); | |
70dd11f7 | 9642 | else if (specs->short_p) |
843bd2fa | 9643 | error_at (loc, |
9644 | ("both %<short%> and %<float%> in " | |
9645 | "declaration specifiers")); | |
70dd11f7 | 9646 | else if (specs->signed_p) |
843bd2fa | 9647 | error_at (loc, |
9648 | ("both %<signed%> and %<float%> in " | |
9649 | "declaration specifiers")); | |
70dd11f7 | 9650 | else if (specs->unsigned_p) |
843bd2fa | 9651 | error_at (loc, |
9652 | ("both %<unsigned%> and %<float%> in " | |
9653 | "declaration specifiers")); | |
9421ebb9 | 9654 | else if (specs->saturating_p) |
843bd2fa | 9655 | error_at (loc, |
9656 | ("both %<_Sat%> and %<float%> in " | |
9657 | "declaration specifiers")); | |
70dd11f7 | 9658 | else |
a60f3e81 | 9659 | { |
9660 | specs->typespec_word = cts_float; | |
9661 | specs->locations[cdw_typespec] = loc; | |
9662 | } | |
70dd11f7 | 9663 | return specs; |
9664 | case RID_DOUBLE: | |
9665 | if (specs->long_long_p) | |
843bd2fa | 9666 | error_at (loc, |
9667 | ("both %<long long%> and %<double%> in " | |
9668 | "declaration specifiers")); | |
70dd11f7 | 9669 | else if (specs->short_p) |
843bd2fa | 9670 | error_at (loc, |
9671 | ("both %<short%> and %<double%> in " | |
9672 | "declaration specifiers")); | |
70dd11f7 | 9673 | else if (specs->signed_p) |
843bd2fa | 9674 | error_at (loc, |
9675 | ("both %<signed%> and %<double%> in " | |
9676 | "declaration specifiers")); | |
70dd11f7 | 9677 | else if (specs->unsigned_p) |
843bd2fa | 9678 | error_at (loc, |
9679 | ("both %<unsigned%> and %<double%> in " | |
9680 | "declaration specifiers")); | |
9421ebb9 | 9681 | else if (specs->saturating_p) |
843bd2fa | 9682 | error_at (loc, |
9683 | ("both %<_Sat%> and %<double%> in " | |
9684 | "declaration specifiers")); | |
70dd11f7 | 9685 | else |
a60f3e81 | 9686 | { |
9687 | specs->typespec_word = cts_double; | |
9688 | specs->locations[cdw_typespec] = loc; | |
9689 | } | |
70dd11f7 | 9690 | return specs; |
c4503c0a | 9691 | case RID_DFLOAT32: |
9692 | case RID_DFLOAT64: | |
9693 | case RID_DFLOAT128: | |
48e1416a | 9694 | { |
c4503c0a | 9695 | const char *str; |
9696 | if (i == RID_DFLOAT32) | |
9697 | str = "_Decimal32"; | |
9698 | else if (i == RID_DFLOAT64) | |
9699 | str = "_Decimal64"; | |
9700 | else | |
9701 | str = "_Decimal128"; | |
9702 | if (specs->long_long_p) | |
843bd2fa | 9703 | error_at (loc, |
9704 | ("both %<long long%> and %<%s%> in " | |
9705 | "declaration specifiers"), | |
9706 | str); | |
c4503c0a | 9707 | if (specs->long_p) |
843bd2fa | 9708 | error_at (loc, |
9709 | ("both %<long%> and %<%s%> in " | |
9710 | "declaration specifiers"), | |
9711 | str); | |
c4503c0a | 9712 | else if (specs->short_p) |
843bd2fa | 9713 | error_at (loc, |
9714 | ("both %<short%> and %<%s%> in " | |
9715 | "declaration specifiers"), | |
9716 | str); | |
c4503c0a | 9717 | else if (specs->signed_p) |
843bd2fa | 9718 | error_at (loc, |
9719 | ("both %<signed%> and %<%s%> in " | |
9720 | "declaration specifiers"), | |
9721 | str); | |
c4503c0a | 9722 | else if (specs->unsigned_p) |
843bd2fa | 9723 | error_at (loc, |
9724 | ("both %<unsigned%> and %<%s%> in " | |
9725 | "declaration specifiers"), | |
9726 | str); | |
c4503c0a | 9727 | else if (specs->complex_p) |
843bd2fa | 9728 | error_at (loc, |
9729 | ("both %<complex%> and %<%s%> in " | |
9730 | "declaration specifiers"), | |
9731 | str); | |
9421ebb9 | 9732 | else if (specs->saturating_p) |
843bd2fa | 9733 | error_at (loc, |
9734 | ("both %<_Sat%> and %<%s%> in " | |
9735 | "declaration specifiers"), | |
9736 | str); | |
c4503c0a | 9737 | else if (i == RID_DFLOAT32) |
9738 | specs->typespec_word = cts_dfloat32; | |
9739 | else if (i == RID_DFLOAT64) | |
9740 | specs->typespec_word = cts_dfloat64; | |
9741 | else | |
9742 | specs->typespec_word = cts_dfloat128; | |
a60f3e81 | 9743 | specs->locations[cdw_typespec] = loc; |
c4503c0a | 9744 | } |
9745 | if (!targetm.decimal_float_supported_p ()) | |
843bd2fa | 9746 | error_at (loc, |
9747 | ("decimal floating point not supported " | |
9748 | "for this target")); | |
29438999 | 9749 | pedwarn (loc, OPT_Wpedantic, |
8864917d | 9750 | "ISO C does not support decimal floating point"); |
c4503c0a | 9751 | return specs; |
9421ebb9 | 9752 | case RID_FRACT: |
9753 | case RID_ACCUM: | |
9754 | { | |
9755 | const char *str; | |
9756 | if (i == RID_FRACT) | |
9757 | str = "_Fract"; | |
9758 | else | |
9759 | str = "_Accum"; | |
9760 | if (specs->complex_p) | |
843bd2fa | 9761 | error_at (loc, |
9762 | ("both %<complex%> and %<%s%> in " | |
9763 | "declaration specifiers"), | |
9764 | str); | |
9421ebb9 | 9765 | else if (i == RID_FRACT) |
9766 | specs->typespec_word = cts_fract; | |
9767 | else | |
9768 | specs->typespec_word = cts_accum; | |
a60f3e81 | 9769 | specs->locations[cdw_typespec] = loc; |
9421ebb9 | 9770 | } |
9771 | if (!targetm.fixed_point_supported_p ()) | |
843bd2fa | 9772 | error_at (loc, |
9773 | "fixed-point types not supported for this target"); | |
29438999 | 9774 | pedwarn (loc, OPT_Wpedantic, |
8864917d | 9775 | "ISO C does not support fixed-point types"); |
9421ebb9 | 9776 | return specs; |
70dd11f7 | 9777 | default: |
9778 | /* ObjC reserved word "id", handled below. */ | |
9779 | break; | |
9780 | } | |
9781 | } | |
9553111d | 9782 | } |
70dd11f7 | 9783 | |
9784 | /* Now we have a typedef (a TYPE_DECL node), an identifier (some | |
9785 | form of ObjC type, cases such as "int" and "long" being handled | |
9786 | above), a TYPE (struct, union, enum and typeof specifiers) or an | |
9787 | ERROR_MARK. In none of these cases may there have previously | |
9788 | been any type specifiers. */ | |
9789 | if (specs->type || specs->typespec_word != cts_none | |
9790 | || specs->long_p || specs->short_p || specs->signed_p | |
9791 | || specs->unsigned_p || specs->complex_p) | |
843bd2fa | 9792 | error_at (loc, "two or more data types in declaration specifiers"); |
9553111d | 9793 | else if (TREE_CODE (type) == TYPE_DECL) |
9794 | { | |
9795 | if (TREE_TYPE (type) == error_mark_node) | |
9796 | ; /* Allow the type to default to int to avoid cascading errors. */ | |
9797 | else | |
9798 | { | |
9799 | specs->type = TREE_TYPE (type); | |
9800 | specs->decl_attr = DECL_ATTRIBUTES (type); | |
490eec42 | 9801 | specs->typedef_p = true; |
70dd11f7 | 9802 | specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type); |
a60f3e81 | 9803 | specs->locations[cdw_typedef] = loc; |
843bd2fa | 9804 | |
9805 | /* If this typedef name is defined in a struct, then a C++ | |
9806 | lookup would return a different value. */ | |
9807 | if (warn_cxx_compat | |
9808 | && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct) | |
9809 | warning_at (loc, OPT_Wc___compat, | |
9810 | "C++ lookup of %qD would return a field, not a type", | |
9811 | type); | |
9812 | ||
9813 | /* If we are parsing a struct, record that a struct field | |
9814 | used a typedef. */ | |
9815 | if (warn_cxx_compat && struct_parse_info != NULL) | |
f1f41a6c | 9816 | struct_parse_info->typedefs_seen.safe_push (type); |
9553111d | 9817 | } |
9818 | } | |
9553111d | 9819 | else if (TREE_CODE (type) == IDENTIFIER_NODE) |
9820 | { | |
9821 | tree t = lookup_name (type); | |
9822 | if (!t || TREE_CODE (t) != TYPE_DECL) | |
843bd2fa | 9823 | error_at (loc, "%qE fails to be a typedef or built in type", type); |
9553111d | 9824 | else if (TREE_TYPE (t) == error_mark_node) |
9825 | ; | |
9826 | else | |
a60f3e81 | 9827 | { |
9828 | specs->type = TREE_TYPE (t); | |
9829 | specs->locations[cdw_typespec] = loc; | |
9830 | } | |
9553111d | 9831 | } |
26ee9e7a | 9832 | else |
19702c1d | 9833 | { |
26ee9e7a | 9834 | if (TREE_CODE (type) != ERROR_MARK && spec.kind == ctsk_typeof) |
a75b1c71 | 9835 | { |
9836 | specs->typedef_p = true; | |
a60f3e81 | 9837 | specs->locations[cdw_typedef] = loc; |
a75b1c71 | 9838 | if (spec.expr) |
9839 | { | |
9840 | if (specs->expr) | |
9841 | specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr), | |
9842 | specs->expr, spec.expr); | |
9843 | else | |
9844 | specs->expr = spec.expr; | |
9845 | specs->expr_const_operands &= spec.expr_const_operands; | |
9846 | } | |
9847 | } | |
19702c1d | 9848 | specs->type = type; |
9849 | } | |
9553111d | 9850 | |
9851 | return specs; | |
9852 | } | |
9853 | ||
9854 | /* Add the storage class specifier or function specifier SCSPEC to the | |
9855 | declaration specifiers SPECS, returning SPECS. */ | |
9856 | ||
9857 | struct c_declspecs * | |
a60f3e81 | 9858 | declspecs_add_scspec (source_location loc, |
9859 | struct c_declspecs *specs, | |
9860 | tree scspec) | |
9553111d | 9861 | { |
9862 | enum rid i; | |
feb04535 | 9863 | enum c_storage_class n = csc_none; |
9864 | bool dupe = false; | |
1576dec7 | 9865 | specs->declspecs_seen_p = true; |
9553111d | 9866 | gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE |
9867 | && C_IS_RESERVED_WORD (scspec)); | |
9868 | i = C_RID_CODE (scspec); | |
02619052 | 9869 | if (specs->non_sc_seen_p) |
48e1416a | 9870 | warning (OPT_Wold_style_declaration, |
02619052 | 9871 | "%qE is not at beginning of declaration", scspec); |
feb04535 | 9872 | switch (i) |
9873 | { | |
9874 | case RID_INLINE: | |
ebdbd341 | 9875 | /* C99 permits duplicate inline. Although of doubtful utility, |
9876 | it seems simplest to permit it in gnu89 mode as well, as | |
9877 | there is also little utility in maintaining this as a | |
9878 | difference between gnu89 and C99 inline. */ | |
9879 | dupe = false; | |
feb04535 | 9880 | specs->inline_p = true; |
a60f3e81 | 9881 | specs->locations[cdw_inline] = loc; |
feb04535 | 9882 | break; |
985c6e3a | 9883 | case RID_NORETURN: |
9884 | /* Duplicate _Noreturn is permitted. */ | |
9885 | dupe = false; | |
9886 | specs->noreturn_p = true; | |
a60f3e81 | 9887 | specs->locations[cdw_noreturn] = loc; |
985c6e3a | 9888 | break; |
feb04535 | 9889 | case RID_THREAD: |
9890 | dupe = specs->thread_p; | |
9891 | if (specs->storage_class == csc_auto) | |
d184e0c0 | 9892 | error ("%qE used with %<auto%>", scspec); |
feb04535 | 9893 | else if (specs->storage_class == csc_register) |
d184e0c0 | 9894 | error ("%qE used with %<register%>", scspec); |
feb04535 | 9895 | else if (specs->storage_class == csc_typedef) |
d184e0c0 | 9896 | error ("%qE used with %<typedef%>", scspec); |
feb04535 | 9897 | else |
a60f3e81 | 9898 | { |
9899 | specs->thread_p = true; | |
d184e0c0 | 9900 | specs->thread_gnu_p = (strcmp (IDENTIFIER_POINTER (scspec), |
9901 | "__thread") == 0); | |
9902 | /* A diagnostic is not required for the use of this | |
9903 | identifier in the implementation namespace; only diagnose | |
9904 | it for the C11 spelling because of existing code using | |
9905 | the other spelling. */ | |
508ea33a | 9906 | if (!specs->thread_gnu_p) |
d184e0c0 | 9907 | { |
9908 | if (flag_isoc99) | |
508ea33a | 9909 | pedwarn_c99 (loc, OPT_Wpedantic, |
9910 | "ISO C99 does not support %qE", scspec); | |
d184e0c0 | 9911 | else |
508ea33a | 9912 | pedwarn_c99 (loc, OPT_Wpedantic, |
9913 | "ISO C90 does not support %qE", scspec); | |
d184e0c0 | 9914 | } |
a60f3e81 | 9915 | specs->locations[cdw_thread] = loc; |
9916 | } | |
feb04535 | 9917 | break; |
9918 | case RID_AUTO: | |
9919 | n = csc_auto; | |
9920 | break; | |
9921 | case RID_EXTERN: | |
9922 | n = csc_extern; | |
9923 | /* Diagnose "__thread extern". */ | |
d184e0c0 | 9924 | if (specs->thread_p && specs->thread_gnu_p) |
9553111d | 9925 | error ("%<__thread%> before %<extern%>"); |
feb04535 | 9926 | break; |
9927 | case RID_REGISTER: | |
9928 | n = csc_register; | |
9929 | break; | |
9930 | case RID_STATIC: | |
9931 | n = csc_static; | |
9932 | /* Diagnose "__thread static". */ | |
d184e0c0 | 9933 | if (specs->thread_p && specs->thread_gnu_p) |
9553111d | 9934 | error ("%<__thread%> before %<static%>"); |
feb04535 | 9935 | break; |
9936 | case RID_TYPEDEF: | |
9937 | n = csc_typedef; | |
9938 | break; | |
9939 | default: | |
9940 | gcc_unreachable (); | |
9941 | } | |
9942 | if (n != csc_none && n == specs->storage_class) | |
9943 | dupe = true; | |
9944 | if (dupe) | |
d184e0c0 | 9945 | { |
9946 | if (i == RID_THREAD) | |
9947 | error ("duplicate %<_Thread_local%> or %<__thread%>"); | |
9948 | else | |
9949 | error ("duplicate %qE", scspec); | |
9950 | } | |
feb04535 | 9951 | if (n != csc_none) |
9952 | { | |
9953 | if (specs->storage_class != csc_none && n != specs->storage_class) | |
9954 | { | |
9955 | error ("multiple storage classes in declaration specifiers"); | |
9956 | } | |
9957 | else | |
9958 | { | |
9959 | specs->storage_class = n; | |
a60f3e81 | 9960 | specs->locations[cdw_storage_class] = loc; |
feb04535 | 9961 | if (n != csc_extern && n != csc_static && specs->thread_p) |
9962 | { | |
d184e0c0 | 9963 | error ("%qs used with %qE", |
9964 | specs->thread_gnu_p ? "__thread" : "_Thread_local", | |
9965 | scspec); | |
feb04535 | 9966 | specs->thread_p = false; |
9967 | } | |
9968 | } | |
9553111d | 9969 | } |
9553111d | 9970 | return specs; |
9971 | } | |
9972 | ||
9973 | /* Add the attributes ATTRS to the declaration specifiers SPECS, | |
9974 | returning SPECS. */ | |
9975 | ||
9976 | struct c_declspecs * | |
a60f3e81 | 9977 | declspecs_add_attrs (source_location loc, struct c_declspecs *specs, tree attrs) |
9553111d | 9978 | { |
9979 | specs->attrs = chainon (attrs, specs->attrs); | |
a60f3e81 | 9980 | specs->locations[cdw_attributes] = loc; |
1576dec7 | 9981 | specs->declspecs_seen_p = true; |
9553111d | 9982 | return specs; |
9983 | } | |
9984 | ||
83e25171 | 9985 | /* Add an _Alignas specifier (expression ALIGN, or type whose |
9986 | alignment is ALIGN) to the declaration specifiers SPECS, returning | |
9987 | SPECS. */ | |
9988 | struct c_declspecs * | |
a60f3e81 | 9989 | declspecs_add_alignas (source_location loc, |
9990 | struct c_declspecs *specs, tree align) | |
83e25171 | 9991 | { |
9992 | int align_log; | |
9993 | specs->alignas_p = true; | |
a60f3e81 | 9994 | specs->locations[cdw_alignas] = loc; |
83e25171 | 9995 | if (align == error_mark_node) |
9996 | return specs; | |
9997 | align_log = check_user_alignment (align, true); | |
9998 | if (align_log > specs->align_log) | |
9999 | specs->align_log = align_log; | |
10000 | return specs; | |
10001 | } | |
10002 | ||
70dd11f7 | 10003 | /* Combine "long", "short", "signed", "unsigned" and "_Complex" type |
10004 | specifiers with any other type specifier to determine the resulting | |
10005 | type. This is where ISO C checks on complex types are made, since | |
10006 | "_Complex long" is a prefix of the valid ISO C type "_Complex long | |
10007 | double". */ | |
10008 | ||
10009 | struct c_declspecs * | |
10010 | finish_declspecs (struct c_declspecs *specs) | |
10011 | { | |
10012 | /* If a type was specified as a whole, we have no modifiers and are | |
10013 | done. */ | |
10014 | if (specs->type != NULL_TREE) | |
10015 | { | |
10016 | gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p | |
10017 | && !specs->signed_p && !specs->unsigned_p | |
10018 | && !specs->complex_p); | |
26ee9e7a | 10019 | |
10020 | /* Set a dummy type. */ | |
10021 | if (TREE_CODE (specs->type) == ERROR_MARK) | |
10022 | specs->type = integer_type_node; | |
70dd11f7 | 10023 | return specs; |
10024 | } | |
10025 | ||
10026 | /* If none of "void", "_Bool", "char", "int", "float" or "double" | |
10027 | has been specified, treat it as "int" unless "_Complex" is | |
10028 | present and there are no other specifiers. If we just have | |
10029 | "_Complex", it is equivalent to "_Complex double", but e.g. | |
10030 | "_Complex short" is equivalent to "_Complex short int". */ | |
10031 | if (specs->typespec_word == cts_none) | |
10032 | { | |
9421ebb9 | 10033 | if (specs->saturating_p) |
84786a68 | 10034 | { |
a60f3e81 | 10035 | error_at (specs->locations[cdw_saturating], |
10036 | "%<_Sat%> is used without %<_Fract%> or %<_Accum%>"); | |
14e882ea | 10037 | if (!targetm.fixed_point_supported_p ()) |
a60f3e81 | 10038 | error_at (specs->locations[cdw_saturating], |
10039 | "fixed-point types not supported for this target"); | |
84786a68 | 10040 | specs->typespec_word = cts_fract; |
10041 | } | |
10042 | else if (specs->long_p || specs->short_p | |
10043 | || specs->signed_p || specs->unsigned_p) | |
70dd11f7 | 10044 | { |
10045 | specs->typespec_word = cts_int; | |
10046 | } | |
10047 | else if (specs->complex_p) | |
10048 | { | |
10049 | specs->typespec_word = cts_double; | |
a60f3e81 | 10050 | pedwarn (specs->locations[cdw_complex], OPT_Wpedantic, |
8864917d | 10051 | "ISO C does not support plain %<complex%> meaning " |
10052 | "%<double complex%>"); | |
70dd11f7 | 10053 | } |
10054 | else | |
10055 | { | |
10056 | specs->typespec_word = cts_int; | |
10057 | specs->default_int_p = true; | |
10058 | /* We don't diagnose this here because grokdeclarator will | |
10059 | give more specific diagnostics according to whether it is | |
10060 | a function definition. */ | |
10061 | } | |
10062 | } | |
10063 | ||
10064 | /* If "signed" was specified, record this to distinguish "int" and | |
10065 | "signed int" in the case of a bit-field with | |
10066 | -funsigned-bitfields. */ | |
10067 | specs->explicit_signed_p = specs->signed_p; | |
10068 | ||
10069 | /* Now compute the actual type. */ | |
10070 | switch (specs->typespec_word) | |
10071 | { | |
4fba5eb9 | 10072 | case cts_auto_type: |
10073 | gcc_assert (!specs->long_p && !specs->short_p | |
10074 | && !specs->signed_p && !specs->unsigned_p | |
10075 | && !specs->complex_p); | |
10076 | /* Type to be filled in later. */ | |
10077 | break; | |
70dd11f7 | 10078 | case cts_void: |
10079 | gcc_assert (!specs->long_p && !specs->short_p | |
10080 | && !specs->signed_p && !specs->unsigned_p | |
10081 | && !specs->complex_p); | |
10082 | specs->type = void_type_node; | |
10083 | break; | |
10084 | case cts_bool: | |
10085 | gcc_assert (!specs->long_p && !specs->short_p | |
10086 | && !specs->signed_p && !specs->unsigned_p | |
10087 | && !specs->complex_p); | |
10088 | specs->type = boolean_type_node; | |
10089 | break; | |
10090 | case cts_char: | |
10091 | gcc_assert (!specs->long_p && !specs->short_p); | |
10092 | gcc_assert (!(specs->signed_p && specs->unsigned_p)); | |
10093 | if (specs->signed_p) | |
10094 | specs->type = signed_char_type_node; | |
10095 | else if (specs->unsigned_p) | |
10096 | specs->type = unsigned_char_type_node; | |
10097 | else | |
10098 | specs->type = char_type_node; | |
10099 | if (specs->complex_p) | |
10100 | { | |
a60f3e81 | 10101 | pedwarn (specs->locations[cdw_complex], OPT_Wpedantic, |
8864917d | 10102 | "ISO C does not support complex integer types"); |
70dd11f7 | 10103 | specs->type = build_complex_type (specs->type); |
10104 | } | |
10105 | break; | |
6388cfe2 | 10106 | case cts_int128: |
10107 | gcc_assert (!specs->long_p && !specs->short_p && !specs->long_long_p); | |
10108 | gcc_assert (!(specs->signed_p && specs->unsigned_p)); | |
10109 | specs->type = (specs->unsigned_p | |
10110 | ? int128_unsigned_type_node | |
10111 | : int128_integer_type_node); | |
10112 | if (specs->complex_p) | |
10113 | { | |
a60f3e81 | 10114 | pedwarn (specs->locations[cdw_complex], OPT_Wpedantic, |
6388cfe2 | 10115 | "ISO C does not support complex integer types"); |
10116 | specs->type = build_complex_type (specs->type); | |
10117 | } | |
10118 | break; | |
70dd11f7 | 10119 | case cts_int: |
10120 | gcc_assert (!(specs->long_p && specs->short_p)); | |
10121 | gcc_assert (!(specs->signed_p && specs->unsigned_p)); | |
10122 | if (specs->long_long_p) | |
10123 | specs->type = (specs->unsigned_p | |
10124 | ? long_long_unsigned_type_node | |
10125 | : long_long_integer_type_node); | |
10126 | else if (specs->long_p) | |
10127 | specs->type = (specs->unsigned_p | |
10128 | ? long_unsigned_type_node | |
10129 | : long_integer_type_node); | |
10130 | else if (specs->short_p) | |
10131 | specs->type = (specs->unsigned_p | |
10132 | ? short_unsigned_type_node | |
10133 | : short_integer_type_node); | |
10134 | else | |
10135 | specs->type = (specs->unsigned_p | |
10136 | ? unsigned_type_node | |
10137 | : integer_type_node); | |
10138 | if (specs->complex_p) | |
10139 | { | |
a60f3e81 | 10140 | pedwarn (specs->locations[cdw_complex], OPT_Wpedantic, |
8864917d | 10141 | "ISO C does not support complex integer types"); |
70dd11f7 | 10142 | specs->type = build_complex_type (specs->type); |
10143 | } | |
10144 | break; | |
10145 | case cts_float: | |
10146 | gcc_assert (!specs->long_p && !specs->short_p | |
10147 | && !specs->signed_p && !specs->unsigned_p); | |
10148 | specs->type = (specs->complex_p | |
10149 | ? complex_float_type_node | |
10150 | : float_type_node); | |
10151 | break; | |
10152 | case cts_double: | |
10153 | gcc_assert (!specs->long_long_p && !specs->short_p | |
10154 | && !specs->signed_p && !specs->unsigned_p); | |
10155 | if (specs->long_p) | |
10156 | { | |
10157 | specs->type = (specs->complex_p | |
10158 | ? complex_long_double_type_node | |
10159 | : long_double_type_node); | |
10160 | } | |
10161 | else | |
10162 | { | |
10163 | specs->type = (specs->complex_p | |
10164 | ? complex_double_type_node | |
10165 | : double_type_node); | |
10166 | } | |
10167 | break; | |
c4503c0a | 10168 | case cts_dfloat32: |
10169 | case cts_dfloat64: | |
10170 | case cts_dfloat128: | |
10171 | gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p | |
10172 | && !specs->signed_p && !specs->unsigned_p && !specs->complex_p); | |
10173 | if (specs->typespec_word == cts_dfloat32) | |
10174 | specs->type = dfloat32_type_node; | |
10175 | else if (specs->typespec_word == cts_dfloat64) | |
10176 | specs->type = dfloat64_type_node; | |
10177 | else | |
10178 | specs->type = dfloat128_type_node; | |
10179 | break; | |
9421ebb9 | 10180 | case cts_fract: |
14e882ea | 10181 | gcc_assert (!specs->complex_p); |
10182 | if (!targetm.fixed_point_supported_p ()) | |
10183 | specs->type = integer_type_node; | |
10184 | else if (specs->saturating_p) | |
9421ebb9 | 10185 | { |
10186 | if (specs->long_long_p) | |
10187 | specs->type = specs->unsigned_p | |
10188 | ? sat_unsigned_long_long_fract_type_node | |
10189 | : sat_long_long_fract_type_node; | |
10190 | else if (specs->long_p) | |
10191 | specs->type = specs->unsigned_p | |
10192 | ? sat_unsigned_long_fract_type_node | |
10193 | : sat_long_fract_type_node; | |
10194 | else if (specs->short_p) | |
10195 | specs->type = specs->unsigned_p | |
10196 | ? sat_unsigned_short_fract_type_node | |
10197 | : sat_short_fract_type_node; | |
10198 | else | |
10199 | specs->type = specs->unsigned_p | |
10200 | ? sat_unsigned_fract_type_node | |
10201 | : sat_fract_type_node; | |
14e882ea | 10202 | } |
9421ebb9 | 10203 | else |
10204 | { | |
10205 | if (specs->long_long_p) | |
10206 | specs->type = specs->unsigned_p | |
10207 | ? unsigned_long_long_fract_type_node | |
10208 | : long_long_fract_type_node; | |
10209 | else if (specs->long_p) | |
10210 | specs->type = specs->unsigned_p | |
10211 | ? unsigned_long_fract_type_node | |
10212 | : long_fract_type_node; | |
10213 | else if (specs->short_p) | |
10214 | specs->type = specs->unsigned_p | |
10215 | ? unsigned_short_fract_type_node | |
10216 | : short_fract_type_node; | |
10217 | else | |
10218 | specs->type = specs->unsigned_p | |
10219 | ? unsigned_fract_type_node | |
10220 | : fract_type_node; | |
14e882ea | 10221 | } |
9421ebb9 | 10222 | break; |
10223 | case cts_accum: | |
14e882ea | 10224 | gcc_assert (!specs->complex_p); |
10225 | if (!targetm.fixed_point_supported_p ()) | |
10226 | specs->type = integer_type_node; | |
10227 | else if (specs->saturating_p) | |
9421ebb9 | 10228 | { |
10229 | if (specs->long_long_p) | |
10230 | specs->type = specs->unsigned_p | |
10231 | ? sat_unsigned_long_long_accum_type_node | |
10232 | : sat_long_long_accum_type_node; | |
10233 | else if (specs->long_p) | |
10234 | specs->type = specs->unsigned_p | |
10235 | ? sat_unsigned_long_accum_type_node | |
10236 | : sat_long_accum_type_node; | |
10237 | else if (specs->short_p) | |
10238 | specs->type = specs->unsigned_p | |
10239 | ? sat_unsigned_short_accum_type_node | |
10240 | : sat_short_accum_type_node; | |
10241 | else | |
10242 | specs->type = specs->unsigned_p | |
10243 | ? sat_unsigned_accum_type_node | |
10244 | : sat_accum_type_node; | |
14e882ea | 10245 | } |
9421ebb9 | 10246 | else |
10247 | { | |
10248 | if (specs->long_long_p) | |
10249 | specs->type = specs->unsigned_p | |
10250 | ? unsigned_long_long_accum_type_node | |
10251 | : long_long_accum_type_node; | |
10252 | else if (specs->long_p) | |
10253 | specs->type = specs->unsigned_p | |
10254 | ? unsigned_long_accum_type_node | |
10255 | : long_accum_type_node; | |
10256 | else if (specs->short_p) | |
10257 | specs->type = specs->unsigned_p | |
10258 | ? unsigned_short_accum_type_node | |
10259 | : short_accum_type_node; | |
10260 | else | |
10261 | specs->type = specs->unsigned_p | |
10262 | ? unsigned_accum_type_node | |
10263 | : accum_type_node; | |
14e882ea | 10264 | } |
9421ebb9 | 10265 | break; |
70dd11f7 | 10266 | default: |
10267 | gcc_unreachable (); | |
10268 | } | |
10269 | ||
10270 | return specs; | |
10271 | } | |
10272 | ||
c131e678 | 10273 | /* A subroutine of c_write_global_declarations. Perform final processing |
10274 | on one file scope's declarations (or the external scope's declarations), | |
10275 | GLOBALS. */ | |
10276 | ||
393b349a | 10277 | static void |
10278 | c_write_global_declarations_1 (tree globals) | |
40109983 | 10279 | { |
40109983 | 10280 | tree decl; |
aac7998f | 10281 | bool reconsider; |
14338e9a | 10282 | |
393b349a | 10283 | /* Process the decls in the order they were written. */ |
1767a056 | 10284 | for (decl = globals; decl; decl = DECL_CHAIN (decl)) |
9823d3a9 | 10285 | { |
9823d3a9 | 10286 | /* Check for used but undefined static functions using the C |
10287 | standard's definition of "used", and set TREE_NO_WARNING so | |
10288 | that check_global_declarations doesn't repeat the check. */ | |
10289 | if (TREE_CODE (decl) == FUNCTION_DECL | |
10290 | && DECL_INITIAL (decl) == 0 | |
10291 | && DECL_EXTERNAL (decl) | |
10292 | && !TREE_PUBLIC (decl) | |
10293 | && C_DECL_USED (decl)) | |
10294 | { | |
21ca8540 | 10295 | pedwarn (input_location, 0, "%q+F used but never defined", decl); |
9823d3a9 | 10296 | TREE_NO_WARNING (decl) = 1; |
10297 | } | |
c131e678 | 10298 | |
10299 | wrapup_global_declaration_1 (decl); | |
9823d3a9 | 10300 | } |
aac7998f | 10301 | |
10302 | do | |
10303 | { | |
10304 | reconsider = false; | |
1767a056 | 10305 | for (decl = globals; decl; decl = DECL_CHAIN (decl)) |
aac7998f | 10306 | reconsider |= wrapup_global_declaration_2 (decl); |
10307 | } | |
10308 | while (reconsider); | |
10309 | ||
1767a056 | 10310 | for (decl = globals; decl; decl = DECL_CHAIN (decl)) |
aac7998f | 10311 | check_global_declaration_1 (decl); |
c131e678 | 10312 | } |
40109983 | 10313 | |
c131e678 | 10314 | /* A subroutine of c_write_global_declarations Emit debug information for each |
10315 | of the declarations in GLOBALS. */ | |
14338e9a | 10316 | |
c131e678 | 10317 | static void |
10318 | c_write_global_declarations_2 (tree globals) | |
10319 | { | |
10320 | tree decl; | |
10321 | ||
1767a056 | 10322 | for (decl = globals; decl ; decl = DECL_CHAIN (decl)) |
c131e678 | 10323 | debug_hooks->global_decl (decl); |
40109983 | 10324 | } |
10325 | ||
f608fcb7 | 10326 | /* Callback to collect a source_ref from a DECL. */ |
10327 | ||
10328 | static void | |
10329 | collect_source_ref_cb (tree decl) | |
10330 | { | |
10331 | if (!DECL_IS_BUILTIN (decl)) | |
10332 | collect_source_ref (LOCATION_FILE (decl_sloc (decl, false))); | |
10333 | } | |
10334 | ||
00ce46e2 | 10335 | /* Preserve the external declarations scope across a garbage collect. */ |
10336 | static GTY(()) tree ext_block; | |
10337 | ||
f608fcb7 | 10338 | /* Collect all references relevant to SOURCE_FILE. */ |
10339 | ||
10340 | static void | |
10341 | collect_all_refs (const char *source_file) | |
10342 | { | |
10343 | tree t; | |
23bdc9ca | 10344 | unsigned i; |
f608fcb7 | 10345 | |
f1f41a6c | 10346 | FOR_EACH_VEC_ELT (*all_translation_units, i, t) |
f608fcb7 | 10347 | collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t)), source_file); |
00ce46e2 | 10348 | |
10349 | collect_ada_nodes (BLOCK_VARS (ext_block), source_file); | |
f608fcb7 | 10350 | } |
10351 | ||
10352 | /* Iterate over all global declarations and call CALLBACK. */ | |
10353 | ||
10354 | static void | |
10355 | for_each_global_decl (void (*callback) (tree decl)) | |
10356 | { | |
10357 | tree t; | |
10358 | tree decls; | |
10359 | tree decl; | |
23bdc9ca | 10360 | unsigned i; |
f608fcb7 | 10361 | |
f1f41a6c | 10362 | FOR_EACH_VEC_ELT (*all_translation_units, i, t) |
f608fcb7 | 10363 | { |
10364 | decls = DECL_INITIAL (t); | |
10365 | for (decl = BLOCK_VARS (decls); decl; decl = TREE_CHAIN (decl)) | |
10366 | callback (decl); | |
10367 | } | |
f608fcb7 | 10368 | |
00ce46e2 | 10369 | for (decl = BLOCK_VARS (ext_block); decl; decl = TREE_CHAIN (decl)) |
10370 | callback (decl); | |
10371 | } | |
c131e678 | 10372 | |
40109983 | 10373 | void |
393b349a | 10374 | c_write_global_declarations (void) |
40109983 | 10375 | { |
c131e678 | 10376 | tree t; |
23bdc9ca | 10377 | unsigned i; |
d9cf68bf | 10378 | |
393b349a | 10379 | /* We don't want to do this if generating a PCH. */ |
10380 | if (pch_file) | |
10381 | return; | |
40109983 | 10382 | |
6198e8f6 | 10383 | timevar_start (TV_PHASE_DEFERRED); |
10384 | ||
64cd9619 | 10385 | /* Do the Objective-C stuff. This is where all the Objective-C |
10386 | module stuff gets generated (symtab, class/protocol/selector | |
10387 | lists etc). */ | |
10388 | if (c_dialect_objc ()) | |
10389 | objc_write_global_declarations (); | |
10390 | ||
aea7e1dc | 10391 | /* Close the external scope. */ |
10392 | ext_block = pop_scope (); | |
10393 | external_scope = 0; | |
231bd014 | 10394 | gcc_assert (!current_scope); |
aea7e1dc | 10395 | |
f608fcb7 | 10396 | /* Handle -fdump-ada-spec[-slim]. */ |
ef34afc1 | 10397 | if (flag_dump_ada_spec || flag_dump_ada_spec_slim) |
f608fcb7 | 10398 | { |
10399 | /* Build a table of files to generate specs for */ | |
ef34afc1 | 10400 | if (flag_dump_ada_spec_slim) |
f608fcb7 | 10401 | collect_source_ref (main_input_filename); |
10402 | else | |
10403 | for_each_global_decl (collect_source_ref_cb); | |
10404 | ||
10405 | dump_ada_specs (collect_all_refs, NULL); | |
10406 | } | |
10407 | ||
9021d2da | 10408 | if (ext_block) |
10409 | { | |
10410 | tree tmp = BLOCK_VARS (ext_block); | |
10411 | int flags; | |
10412 | FILE * stream = dump_begin (TDI_tu, &flags); | |
10413 | if (stream && tmp) | |
a0c938f0 | 10414 | { |
10415 | dump_node (tmp, flags & ~TDF_SLIM, stream); | |
10416 | dump_end (TDI_tu, stream); | |
10417 | } | |
9021d2da | 10418 | } |
c131e678 | 10419 | |
10420 | /* Process all file scopes in this compilation, and the external_scope, | |
10421 | through wrapup_global_declarations and check_global_declarations. */ | |
f1f41a6c | 10422 | FOR_EACH_VEC_ELT (*all_translation_units, i, t) |
c131e678 | 10423 | c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t))); |
aea7e1dc | 10424 | c_write_global_declarations_1 (BLOCK_VARS (ext_block)); |
10425 | ||
6198e8f6 | 10426 | timevar_stop (TV_PHASE_DEFERRED); |
161121a9 | 10427 | timevar_start (TV_PHASE_OPT_GEN); |
6198e8f6 | 10428 | |
aea7e1dc | 10429 | /* We're done parsing; proceed to optimize and emit assembly. |
10430 | FIXME: shouldn't be the front end's responsibility to call this. */ | |
35ee1c66 | 10431 | symtab->finalize_compilation_unit (); |
c131e678 | 10432 | |
161121a9 | 10433 | timevar_stop (TV_PHASE_OPT_GEN); |
6198e8f6 | 10434 | timevar_start (TV_PHASE_DBGINFO); |
10435 | ||
c131e678 | 10436 | /* After cgraph has had a chance to emit everything that's going to |
10437 | be emitted, output debug information for globals. */ | |
852f689e | 10438 | if (!seen_error ()) |
c131e678 | 10439 | { |
10440 | timevar_push (TV_SYMOUT); | |
f1f41a6c | 10441 | FOR_EACH_VEC_ELT (*all_translation_units, i, t) |
c131e678 | 10442 | c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t))); |
10443 | c_write_global_declarations_2 (BLOCK_VARS (ext_block)); | |
10444 | timevar_pop (TV_SYMOUT); | |
10445 | } | |
10446 | ||
10447 | ext_block = NULL; | |
6198e8f6 | 10448 | timevar_stop (TV_PHASE_DBGINFO); |
40109983 | 10449 | } |
10450 | ||
6ad8abad | 10451 | /* Register reserved keyword WORD as qualifier for address space AS. */ |
10452 | ||
10453 | void | |
10454 | c_register_addr_space (const char *word, addr_space_t as) | |
10455 | { | |
10456 | int rid = RID_FIRST_ADDR_SPACE + as; | |
10457 | tree id; | |
10458 | ||
10459 | /* Address space qualifiers are only supported | |
10460 | in C with GNU extensions enabled. */ | |
10461 | if (c_dialect_objc () || flag_no_asm) | |
10462 | return; | |
10463 | ||
10464 | id = get_identifier (word); | |
10465 | C_SET_RID_CODE (id, rid); | |
10466 | C_IS_RESERVED_WORD (id) = 1; | |
10467 | ridpointers [rid] = id; | |
10468 | } | |
10469 | ||
bc7bff74 | 10470 | /* Return identifier to look up for omp declare reduction. */ |
10471 | ||
10472 | tree | |
10473 | c_omp_reduction_id (enum tree_code reduction_code, tree reduction_id) | |
10474 | { | |
10475 | const char *p = NULL; | |
10476 | switch (reduction_code) | |
10477 | { | |
10478 | case PLUS_EXPR: p = "+"; break; | |
10479 | case MULT_EXPR: p = "*"; break; | |
10480 | case MINUS_EXPR: p = "-"; break; | |
10481 | case BIT_AND_EXPR: p = "&"; break; | |
10482 | case BIT_XOR_EXPR: p = "^"; break; | |
10483 | case BIT_IOR_EXPR: p = "|"; break; | |
10484 | case TRUTH_ANDIF_EXPR: p = "&&"; break; | |
10485 | case TRUTH_ORIF_EXPR: p = "||"; break; | |
10486 | case MIN_EXPR: p = "min"; break; | |
10487 | case MAX_EXPR: p = "max"; break; | |
10488 | default: | |
10489 | break; | |
10490 | } | |
10491 | ||
10492 | if (p == NULL) | |
10493 | { | |
10494 | if (TREE_CODE (reduction_id) != IDENTIFIER_NODE) | |
10495 | return error_mark_node; | |
10496 | p = IDENTIFIER_POINTER (reduction_id); | |
10497 | } | |
10498 | ||
10499 | const char prefix[] = "omp declare reduction "; | |
10500 | size_t lenp = sizeof (prefix); | |
10501 | size_t len = strlen (p); | |
10502 | char *name = XALLOCAVEC (char, lenp + len); | |
10503 | memcpy (name, prefix, lenp - 1); | |
10504 | memcpy (name + lenp - 1, p, len + 1); | |
10505 | return get_identifier (name); | |
10506 | } | |
10507 | ||
10508 | /* Lookup REDUCTION_ID in the current scope, or create an artificial | |
10509 | VAR_DECL, bind it into the current scope and return it. */ | |
10510 | ||
10511 | tree | |
10512 | c_omp_reduction_decl (tree reduction_id) | |
10513 | { | |
10514 | struct c_binding *b = I_SYMBOL_BINDING (reduction_id); | |
10515 | if (b != NULL && B_IN_CURRENT_SCOPE (b)) | |
10516 | return b->decl; | |
10517 | ||
10518 | tree decl = build_decl (BUILTINS_LOCATION, VAR_DECL, | |
10519 | reduction_id, integer_type_node); | |
10520 | DECL_ARTIFICIAL (decl) = 1; | |
10521 | DECL_EXTERNAL (decl) = 1; | |
10522 | TREE_STATIC (decl) = 1; | |
10523 | TREE_PUBLIC (decl) = 0; | |
10524 | bind (reduction_id, decl, current_scope, true, false, BUILTINS_LOCATION); | |
10525 | return decl; | |
10526 | } | |
10527 | ||
10528 | /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */ | |
10529 | ||
10530 | tree | |
10531 | c_omp_reduction_lookup (tree reduction_id, tree type) | |
10532 | { | |
10533 | struct c_binding *b = I_SYMBOL_BINDING (reduction_id); | |
10534 | while (b) | |
10535 | { | |
10536 | tree t; | |
10537 | for (t = DECL_INITIAL (b->decl); t; t = TREE_CHAIN (t)) | |
10538 | if (comptypes (TREE_PURPOSE (t), type)) | |
10539 | return TREE_VALUE (t); | |
10540 | b = b->shadowed; | |
10541 | } | |
10542 | return error_mark_node; | |
10543 | } | |
10544 | ||
10545 | /* Helper function called via walk_tree, to diagnose invalid | |
10546 | #pragma omp declare reduction combiners or initializers. */ | |
10547 | ||
10548 | tree | |
10549 | c_check_omp_declare_reduction_r (tree *tp, int *, void *data) | |
10550 | { | |
10551 | tree *vars = (tree *) data; | |
10552 | if (SSA_VAR_P (*tp) | |
10553 | && !DECL_ARTIFICIAL (*tp) | |
10554 | && *tp != vars[0] | |
10555 | && *tp != vars[1]) | |
10556 | { | |
10557 | location_t loc = DECL_SOURCE_LOCATION (vars[0]); | |
10558 | if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars[0])), "omp_out") == 0) | |
10559 | error_at (loc, "%<#pragma omp declare reduction%> combiner refers to " | |
10560 | "variable %qD which is not %<omp_out%> nor %<omp_in%>", | |
10561 | *tp); | |
10562 | else | |
10563 | error_at (loc, "%<#pragma omp declare reduction%> initializer refers " | |
10564 | "to variable %qD which is not %<omp_priv%> nor " | |
10565 | "%<omp_orig%>", | |
10566 | *tp); | |
10567 | return *tp; | |
10568 | } | |
10569 | return NULL_TREE; | |
10570 | } | |
10571 | ||
e53d55e7 | 10572 | #include "gt-c-c-decl.h" |