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51ef3909 | 1 | /* Process declarations and variables for C compiler. |
711789cc | 2 | Copyright (C) 1988-2013 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" |
5ded8c6f | 62 | #include "pointer-set.h" |
9227b6fc | 63 | #include "plugin.h" |
7bedc3a0 | 64 | #include "c-family/c-ada-spec.h" |
d037099f | 65 | #include "cilk.h" |
11ce684d | 66 | |
51ef3909 | 67 | /* In grokdeclarator, distinguish syntactic contexts of declarators. */ |
68 | enum decl_context | |
69 | { NORMAL, /* Ordinary declaration */ | |
70 | FUNCDEF, /* Function definition */ | |
71 | PARM, /* Declaration of parm before function body */ | |
72 | FIELD, /* Declaration inside struct or union */ | |
51ef3909 | 73 | TYPENAME}; /* Typename (inside cast or sizeof) */ |
74 | ||
81f218ec | 75 | /* States indicating how grokdeclarator() should handle declspecs marked |
76 | with __attribute__((deprecated)). An object declared as | |
77 | __attribute__((deprecated)) suppresses warnings of uses of other | |
78 | deprecated items. */ | |
79 | ||
80 | enum deprecated_states { | |
81 | DEPRECATED_NORMAL, | |
82 | DEPRECATED_SUPPRESS | |
83 | }; | |
84 | ||
51ef3909 | 85 | \f |
51ef3909 | 86 | /* Nonzero if we have seen an invalid cross reference |
87 | to a struct, union, or enum, but not yet printed the message. */ | |
51ef3909 | 88 | tree pending_invalid_xref; |
e24e8df7 | 89 | |
51ef3909 | 90 | /* File and line to appear in the eventual error message. */ |
bca5a169 | 91 | location_t pending_invalid_xref_location; |
51ef3909 | 92 | |
a89ce285 | 93 | /* The file and line that the prototype came from if this is an |
94 | old-style definition; used for diagnostics in | |
95 | store_parm_decls_oldstyle. */ | |
2b652cf3 | 96 | |
46f9c5ec | 97 | static location_t current_function_prototype_locus; |
06460bd1 | 98 | |
3eafcdb5 | 99 | /* Whether this prototype was built-in. */ |
100 | ||
101 | static bool current_function_prototype_built_in; | |
102 | ||
103 | /* The argument type information of this prototype. */ | |
104 | ||
105 | static tree current_function_prototype_arg_types; | |
106 | ||
731e6cbf | 107 | /* The argument information structure for the function currently being |
108 | defined. */ | |
109 | ||
ac206aff | 110 | static struct c_arg_info *current_function_arg_info; |
731e6cbf | 111 | |
9823d3a9 | 112 | /* The obstack on which parser and related data structures, which are |
113 | not live beyond their top-level declaration or definition, are | |
114 | allocated. */ | |
115 | struct obstack parser_obstack; | |
116 | ||
e41f0d80 | 117 | /* The current statement tree. */ |
118 | ||
1f3233d1 | 119 | static GTY(()) struct stmt_tree_s c_stmt_tree; |
e41f0d80 | 120 | |
8b332087 | 121 | /* State saving variables. */ |
0375a275 | 122 | tree c_break_label; |
123 | tree c_cont_label; | |
d9cf68bf | 124 | |
393b349a | 125 | /* A list of decls to be made automatically visible in each file scope. */ |
126 | static GTY(()) tree visible_builtins; | |
127 | ||
51ef3909 | 128 | /* Set to 0 at beginning of a function definition, set to 1 if |
129 | a return statement that specifies a return value is seen. */ | |
130 | ||
131 | int current_function_returns_value; | |
132 | ||
133 | /* Set to 0 at beginning of a function definition, set to 1 if | |
134 | a return statement with no argument is seen. */ | |
135 | ||
136 | int current_function_returns_null; | |
137 | ||
af857942 | 138 | /* Set to 0 at beginning of a function definition, set to 1 if |
139 | a call to a noreturn function is seen. */ | |
140 | ||
141 | int current_function_returns_abnormally; | |
142 | ||
51ef3909 | 143 | /* Set to nonzero by `grokdeclarator' for a function |
144 | whose return type is defaulted, if warnings for this are desired. */ | |
145 | ||
146 | static int warn_about_return_type; | |
147 | ||
8a1f0315 | 148 | /* Nonzero when the current toplevel function contains a declaration |
149 | of a nested function which is never defined. */ | |
150 | ||
151 | static bool undef_nested_function; | |
152 | ||
7714837c | 153 | /* Mode used to build pointers (VOIDmode means ptr_mode). */ |
154 | ||
155 | enum machine_mode c_default_pointer_mode = VOIDmode; | |
156 | ||
bc7bff74 | 157 | /* If non-zero, implicit "omp declare target" attribute is added into the |
158 | attribute lists. */ | |
159 | int current_omp_declare_target_attribute; | |
51ef3909 | 160 | \f |
393b349a | 161 | /* Each c_binding structure describes one binding of an identifier to |
162 | a decl. All the decls in a scope - irrespective of namespace - are | |
163 | chained together by the ->prev field, which (as the name implies) | |
164 | runs in reverse order. All the decls in a given namespace bound to | |
165 | a given identifier are chained by the ->shadowed field, which runs | |
4194491a | 166 | from inner to outer scopes. |
393b349a | 167 | |
168 | The ->decl field usually points to a DECL node, but there are two | |
169 | exceptions. In the namespace of type tags, the bound entity is a | |
170 | RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared | |
171 | identifier is encountered, it is bound to error_mark_node to | |
172 | suppress further errors about that identifier in the current | |
4194491a | 173 | function. |
174 | ||
f805d53d | 175 | The ->u.type field stores the type of the declaration in this scope; |
606a02e3 | 176 | if NULL, the type is the type of the ->decl field. This is only of |
177 | relevance for objects with external or internal linkage which may | |
178 | be redeclared in inner scopes, forming composite types that only | |
179 | persist for the duration of those scopes. In the external scope, | |
180 | this stores the composite of all the types declared for this | |
181 | object, visible or not. The ->inner_comp field (used only at file | |
182 | scope) stores whether an incomplete array type at file scope was | |
183 | completed at an inner scope to an array size other than 1. | |
184 | ||
f805d53d | 185 | The ->u.label field is used for labels. It points to a structure |
186 | which stores additional information used for warnings. | |
187 | ||
4194491a | 188 | The depth field is copied from the scope structure that holds this |
189 | decl. It is used to preserve the proper ordering of the ->shadowed | |
190 | field (see bind()) and also for a handful of special-case checks. | |
191 | Finally, the invisible bit is true for a decl which should be | |
192 | ignored for purposes of normal name lookup, and the nested bit is | |
193 | true for a decl that's been bound a second time in an inner scope; | |
194 | in all such cases, the binding in the outer scope will have its | |
195 | invisible bit true. */ | |
393b349a | 196 | |
fb1e4f4a | 197 | struct GTY((chain_next ("%h.prev"))) c_binding { |
f805d53d | 198 | union GTY(()) { /* first so GTY desc can use decl */ |
199 | tree GTY((tag ("0"))) type; /* the type in this scope */ | |
200 | struct c_label_vars * GTY((tag ("1"))) label; /* for warnings */ | |
201 | } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u; | |
393b349a | 202 | tree decl; /* the decl bound */ |
203 | tree id; /* the identifier it's bound to */ | |
204 | struct c_binding *prev; /* the previous decl in this scope */ | |
205 | struct c_binding *shadowed; /* the innermost decl shadowed by this one */ | |
4194491a | 206 | unsigned int depth : 28; /* depth of this scope */ |
207 | BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */ | |
208 | BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */ | |
606a02e3 | 209 | BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */ |
843bd2fa | 210 | BOOL_BITFIELD in_struct : 1; /* currently defined as struct field */ |
6fb80942 | 211 | location_t locus; /* location for nested bindings */ |
393b349a | 212 | }; |
4194491a | 213 | #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth) |
214 | #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth) | |
215 | #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/) | |
216 | #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/) | |
393b349a | 217 | |
218 | #define I_SYMBOL_BINDING(node) \ | |
84166705 | 219 | (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding) |
393b349a | 220 | #define I_SYMBOL_DECL(node) \ |
221 | (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0) | |
222 | ||
223 | #define I_TAG_BINDING(node) \ | |
84166705 | 224 | (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding) |
393b349a | 225 | #define I_TAG_DECL(node) \ |
226 | (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0) | |
227 | ||
228 | #define I_LABEL_BINDING(node) \ | |
84166705 | 229 | (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding) |
393b349a | 230 | #define I_LABEL_DECL(node) \ |
231 | (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0) | |
232 | ||
56533c31 | 233 | /* Each C symbol points to three linked lists of c_binding structures. |
234 | These describe the values of the identifier in the three different | |
235 | namespaces defined by the language. */ | |
236 | ||
fb1e4f4a | 237 | struct GTY(()) lang_identifier { |
56533c31 | 238 | struct c_common_identifier common_id; |
239 | struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */ | |
240 | struct c_binding *tag_binding; /* struct/union/enum tags */ | |
241 | struct c_binding *label_binding; /* labels */ | |
242 | }; | |
243 | ||
244 | /* Validate c-lang.c's assumptions. */ | |
245 | extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate | |
246 | [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1]; | |
247 | ||
248 | /* The resulting tree type. */ | |
249 | ||
fb1e4f4a | 250 | union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"), |
a68f7a8d | 251 | chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node |
fb1e4f4a | 252 | { |
56533c31 | 253 | union tree_node GTY ((tag ("0"), |
254 | desc ("tree_node_structure (&%h)"))) | |
255 | generic; | |
256 | struct lang_identifier GTY ((tag ("1"))) identifier; | |
257 | }; | |
258 | ||
f805d53d | 259 | /* Track bindings and other things that matter for goto warnings. For |
260 | efficiency, we do not gather all the decls at the point of | |
261 | definition. Instead, we point into the bindings structure. As | |
262 | scopes are popped, we update these structures and gather the decls | |
263 | that matter at that time. */ | |
264 | ||
265 | struct GTY(()) c_spot_bindings { | |
266 | /* The currently open scope which holds bindings defined when the | |
267 | label was defined or the goto statement was found. */ | |
268 | struct c_scope *scope; | |
269 | /* The bindings in the scope field which were defined at the point | |
270 | of the label or goto. This lets us look at older or newer | |
271 | bindings in the scope, as appropriate. */ | |
272 | struct c_binding *bindings_in_scope; | |
273 | /* The number of statement expressions that have started since this | |
274 | label or goto statement was defined. This is zero if we are at | |
275 | the same statement expression level. It is positive if we are in | |
276 | a statement expression started since this spot. It is negative | |
277 | if this spot was in a statement expression and we have left | |
278 | it. */ | |
279 | int stmt_exprs; | |
280 | /* Whether we started in a statement expression but are no longer in | |
281 | it. This is set to true if stmt_exprs ever goes negative. */ | |
282 | bool left_stmt_expr; | |
283 | }; | |
284 | ||
285 | /* This structure is used to keep track of bindings seen when a goto | |
286 | statement is defined. This is only used if we see the goto | |
287 | statement before we see the label. */ | |
288 | ||
289 | struct GTY(()) c_goto_bindings { | |
290 | /* The location of the goto statement. */ | |
291 | location_t loc; | |
292 | /* The bindings of the goto statement. */ | |
293 | struct c_spot_bindings goto_bindings; | |
294 | }; | |
295 | ||
296 | typedef struct c_goto_bindings *c_goto_bindings_p; | |
f805d53d | 297 | |
298 | /* The additional information we keep track of for a label binding. | |
299 | These fields are updated as scopes are popped. */ | |
300 | ||
301 | struct GTY(()) c_label_vars { | |
302 | /* The shadowed c_label_vars, when one label shadows another (which | |
303 | can only happen using a __label__ declaration). */ | |
304 | struct c_label_vars *shadowed; | |
305 | /* The bindings when the label was defined. */ | |
306 | struct c_spot_bindings label_bindings; | |
307 | /* A list of decls that we care about: decls about which we should | |
308 | warn if a goto branches to this label from later in the function. | |
309 | Decls are added to this list as scopes are popped. We only add | |
310 | the decls that matter. */ | |
f1f41a6c | 311 | vec<tree, va_gc> *decls_in_scope; |
f805d53d | 312 | /* A list of goto statements to this label. This is only used for |
313 | goto statements seen before the label was defined, so that we can | |
314 | issue appropriate warnings for them. */ | |
f1f41a6c | 315 | vec<c_goto_bindings_p, va_gc> *gotos; |
f805d53d | 316 | }; |
317 | ||
393b349a | 318 | /* Each c_scope structure describes the complete contents of one |
319 | scope. Four scopes are distinguished specially: the innermost or | |
320 | current scope, the innermost function scope, the file scope (always | |
321 | the second to outermost) and the outermost or external scope. | |
3bdb6310 | 322 | |
323 | Most declarations are recorded in the current scope. | |
324 | ||
325 | All normal label declarations are recorded in the innermost | |
326 | function scope, as are bindings of undeclared identifiers to | |
327 | error_mark_node. (GCC permits nested functions as an extension, | |
328 | hence the 'innermost' qualifier.) Explicitly declared labels | |
329 | (using the __label__ extension) appear in the current scope. | |
330 | ||
393b349a | 331 | Being in the file scope (current_scope == file_scope) causes |
3bdb6310 | 332 | special behavior in several places below. Also, under some |
333 | conditions the Objective-C front end records declarations in the | |
393b349a | 334 | file scope even though that isn't the current scope. |
335 | ||
336 | All declarations with external linkage are recorded in the external | |
337 | scope, even if they aren't visible there; this models the fact that | |
338 | such declarations are visible to the entire program, and (with a | |
339 | bit of cleverness, see pushdecl) allows diagnosis of some violations | |
340 | of C99 6.2.2p7 and 6.2.7p2: | |
341 | ||
342 | If, within the same translation unit, the same identifier appears | |
343 | with both internal and external linkage, the behavior is | |
344 | undefined. | |
3bdb6310 | 345 | |
393b349a | 346 | All declarations that refer to the same object or function shall |
347 | have compatible type; otherwise, the behavior is undefined. | |
348 | ||
349 | Initially only the built-in declarations, which describe compiler | |
350 | intrinsic functions plus a subset of the standard library, are in | |
351 | this scope. | |
352 | ||
353 | The order of the blocks list matters, and it is frequently appended | |
354 | to. To avoid having to walk all the way to the end of the list on | |
355 | each insertion, or reverse the list later, we maintain a pointer to | |
356 | the last list entry. (FIXME: It should be feasible to use a reversed | |
357 | list here.) | |
358 | ||
359 | The bindings list is strictly in reverse order of declarations; | |
360 | pop_scope relies on this. */ | |
3bdb6310 | 361 | |
51ef3909 | 362 | |
fb1e4f4a | 363 | struct GTY((chain_next ("%h.outer"))) c_scope { |
b3924a2c | 364 | /* The scope containing this one. */ |
365 | struct c_scope *outer; | |
366 | ||
367 | /* The next outermost function scope. */ | |
368 | struct c_scope *outer_function; | |
369 | ||
393b349a | 370 | /* All bindings in this scope. */ |
371 | struct c_binding *bindings; | |
b3924a2c | 372 | |
373 | /* For each scope (except the global one), a chain of BLOCK nodes | |
374 | for all the scopes that were entered and exited one level down. */ | |
375 | tree blocks; | |
3bdb6310 | 376 | tree blocks_last; |
b3924a2c | 377 | |
393b349a | 378 | /* The depth of this scope. Used to keep the ->shadowed chain of |
379 | bindings sorted innermost to outermost. */ | |
380 | unsigned int depth : 28; | |
381 | ||
b3924a2c | 382 | /* True if we are currently filling this scope with parameter |
383 | declarations. */ | |
2ccf1c3a | 384 | BOOL_BITFIELD parm_flag : 1; |
b3924a2c | 385 | |
32d33ab2 | 386 | /* True if we saw [*] in this scope. Used to give an error messages |
387 | if these appears in a function definition. */ | |
388 | BOOL_BITFIELD had_vla_unspec : 1; | |
389 | ||
f74be9a1 | 390 | /* True if we already complained about forward parameter decls |
391 | in this scope. This prevents double warnings on | |
392 | foo (int a; int b; ...) */ | |
2ccf1c3a | 393 | BOOL_BITFIELD warned_forward_parm_decls : 1; |
f74be9a1 | 394 | |
b3924a2c | 395 | /* True if this is the outermost block scope of a function body. |
396 | This scope contains the parameters, the local variables declared | |
397 | in the outermost block, and all the labels (except those in | |
398 | nested functions, or declared at block scope with __label__). */ | |
2ccf1c3a | 399 | BOOL_BITFIELD function_body : 1; |
b3924a2c | 400 | |
401 | /* True means make a BLOCK for this scope no matter what. */ | |
2ccf1c3a | 402 | BOOL_BITFIELD keep : 1; |
3ae3a17f | 403 | |
404 | /* True means that an unsuffixed float constant is _Decimal64. */ | |
405 | BOOL_BITFIELD float_const_decimal64 : 1; | |
f805d53d | 406 | |
407 | /* True if this scope has any label bindings. This is used to speed | |
408 | up searching for labels when popping scopes, particularly since | |
409 | labels are normally only found at function scope. */ | |
410 | BOOL_BITFIELD has_label_bindings : 1; | |
f583ffd4 | 411 | |
412 | /* True if we should issue a warning if a goto statement crosses any | |
413 | of the bindings. We still need to check the list of bindings to | |
414 | find the specific ones we need to warn about. This is true if | |
415 | decl_jump_unsafe would return true for any of the bindings. This | |
416 | is used to avoid looping over all the bindings unnecessarily. */ | |
417 | BOOL_BITFIELD has_jump_unsafe_decl : 1; | |
b3924a2c | 418 | }; |
51ef3909 | 419 | |
6e899616 | 420 | /* The scope currently in effect. */ |
4214af46 | 421 | |
6e899616 | 422 | static GTY(()) struct c_scope *current_scope; |
51ef3909 | 423 | |
bdc33d98 | 424 | /* The innermost function scope. Ordinary (not explicitly declared) |
425 | labels, bindings to error_mark_node, and the lazily-created | |
426 | bindings of __func__ and its friends get this scope. */ | |
b3924a2c | 427 | |
6e899616 | 428 | static GTY(()) struct c_scope *current_function_scope; |
bdc33d98 | 429 | |
393b349a | 430 | /* The C file scope. This is reset for each input translation unit. */ |
431 | ||
432 | static GTY(()) struct c_scope *file_scope; | |
433 | ||
434 | /* The outermost scope. This is used for all declarations with | |
435 | external linkage, and only these, hence the name. */ | |
436 | ||
437 | static GTY(()) struct c_scope *external_scope; | |
438 | ||
439 | /* A chain of c_scope structures awaiting reuse. */ | |
440 | ||
7035b2ab | 441 | static GTY((deletable)) struct c_scope *scope_freelist; |
393b349a | 442 | |
443 | /* A chain of c_binding structures awaiting reuse. */ | |
51ef3909 | 444 | |
7035b2ab | 445 | static GTY((deletable)) struct c_binding *binding_freelist; |
51ef3909 | 446 | |
206bdab4 | 447 | /* Append VAR to LIST in scope SCOPE. */ |
3bdb6310 | 448 | #define SCOPE_LIST_APPEND(scope, list, decl) do { \ |
449 | struct c_scope *s_ = (scope); \ | |
450 | tree d_ = (decl); \ | |
451 | if (s_->list##_last) \ | |
93110716 | 452 | BLOCK_CHAIN (s_->list##_last) = d_; \ |
3bdb6310 | 453 | else \ |
454 | s_->list = d_; \ | |
455 | s_->list##_last = d_; \ | |
456 | } while (0) | |
457 | ||
458 | /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */ | |
459 | #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \ | |
460 | struct c_scope *t_ = (tscope); \ | |
461 | struct c_scope *f_ = (fscope); \ | |
462 | if (t_->to##_last) \ | |
93110716 | 463 | BLOCK_CHAIN (t_->to##_last) = f_->from; \ |
3bdb6310 | 464 | else \ |
465 | t_->to = f_->from; \ | |
466 | t_->to##_last = f_->from##_last; \ | |
467 | } while (0) | |
468 | ||
551ed71a | 469 | /* A c_inline_static structure stores details of a static identifier |
470 | referenced in a definition of a function that may be an inline | |
471 | definition if no subsequent declaration of that function uses | |
472 | "extern" or does not use "inline". */ | |
473 | ||
474 | struct GTY((chain_next ("%h.next"))) c_inline_static { | |
475 | /* The location for a diagnostic. */ | |
476 | location_t location; | |
477 | ||
478 | /* The function that may be an inline definition. */ | |
479 | tree function; | |
480 | ||
481 | /* The object or function referenced. */ | |
482 | tree static_decl; | |
483 | ||
484 | /* What sort of reference this is. */ | |
485 | enum c_inline_static_type type; | |
486 | ||
487 | /* The next such structure or NULL. */ | |
488 | struct c_inline_static *next; | |
489 | }; | |
490 | ||
491 | /* List of static identifiers used or referenced in functions that may | |
492 | be inline definitions. */ | |
493 | static GTY(()) struct c_inline_static *c_inline_statics; | |
494 | ||
6e899616 | 495 | /* True means unconditionally make a BLOCK for the next scope pushed. */ |
51ef3909 | 496 | |
bdc33d98 | 497 | static bool keep_next_level_flag; |
51ef3909 | 498 | |
393b349a | 499 | /* True means the next call to push_scope will be the outermost scope |
e69f6ec7 | 500 | of a function body, so do not push a new scope, merely cease |
501 | expecting parameter decls. */ | |
4214af46 | 502 | |
e69f6ec7 | 503 | static bool next_is_function_body; |
51ef3909 | 504 | |
f1f41a6c | 505 | /* A vector of pointers to c_binding structures. */ |
843bd2fa | 506 | |
507 | typedef struct c_binding *c_binding_ptr; | |
843bd2fa | 508 | |
509 | /* Information that we keep for a struct or union while it is being | |
510 | parsed. */ | |
511 | ||
512 | struct c_struct_parse_info | |
513 | { | |
514 | /* If warn_cxx_compat, a list of types defined within this | |
515 | struct. */ | |
f1f41a6c | 516 | vec<tree> struct_types; |
843bd2fa | 517 | /* If warn_cxx_compat, a list of field names which have bindings, |
518 | and which are defined in this struct, but which are not defined | |
519 | in any enclosing struct. This is used to clear the in_struct | |
520 | field of the c_bindings structure. */ | |
f1f41a6c | 521 | vec<c_binding_ptr> fields; |
843bd2fa | 522 | /* If warn_cxx_compat, a list of typedef names used when defining |
523 | fields in this struct. */ | |
f1f41a6c | 524 | vec<tree> typedefs_seen; |
843bd2fa | 525 | }; |
526 | ||
527 | /* Information for the struct or union currently being parsed, or | |
528 | NULL if not parsing a struct or union. */ | |
529 | static struct c_struct_parse_info *struct_parse_info; | |
530 | ||
51ef3909 | 531 | /* Forward declarations. */ |
393b349a | 532 | static tree lookup_name_in_scope (tree, struct c_scope *); |
e60a6f7b | 533 | static tree c_make_fname_decl (location_t, tree, int); |
9553111d | 534 | static tree grokdeclarator (const struct c_declarator *, |
535 | struct c_declspecs *, | |
a75b1c71 | 536 | enum decl_context, bool, tree *, tree *, tree *, |
537 | bool *, enum deprecated_states); | |
ac206aff | 538 | static tree grokparms (struct c_arg_info *, bool); |
1cae46be | 539 | static void layout_array_type (tree); |
51ef3909 | 540 | \f |
d1725120 | 541 | /* T is a statement. Add it to the statement-tree. This is the |
542 | C/ObjC version--C++ has a slightly different version of this | |
543 | function. */ | |
544 | ||
545 | tree | |
546 | add_stmt (tree t) | |
547 | { | |
548 | enum tree_code code = TREE_CODE (t); | |
549 | ||
35cc02b5 | 550 | if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR) |
d1725120 | 551 | { |
552 | if (!EXPR_HAS_LOCATION (t)) | |
553 | SET_EXPR_LOCATION (t, input_location); | |
554 | } | |
555 | ||
556 | if (code == LABEL_EXPR || code == CASE_LABEL_EXPR) | |
557 | STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1; | |
558 | ||
559 | /* Add T to the statement-tree. Non-side-effect statements need to be | |
560 | recorded during statement expressions. */ | |
cacfdc02 | 561 | if (!building_stmt_list_p ()) |
562 | push_stmt_list (); | |
d1725120 | 563 | append_to_statement_list_force (t, &cur_stmt_list); |
564 | ||
565 | return t; | |
566 | } | |
7714837c | 567 | \f |
568 | /* Build a pointer type using the default pointer mode. */ | |
569 | ||
570 | static tree | |
571 | c_build_pointer_type (tree to_type) | |
572 | { | |
573 | addr_space_t as = to_type == error_mark_node? ADDR_SPACE_GENERIC | |
574 | : TYPE_ADDR_SPACE (to_type); | |
575 | enum machine_mode pointer_mode; | |
576 | ||
577 | if (as != ADDR_SPACE_GENERIC || c_default_pointer_mode == VOIDmode) | |
578 | pointer_mode = targetm.addr_space.pointer_mode (as); | |
579 | else | |
580 | pointer_mode = c_default_pointer_mode; | |
581 | return build_pointer_type_for_mode (to_type, pointer_mode, false); | |
582 | } | |
583 | ||
d1725120 | 584 | \f |
f583ffd4 | 585 | /* Return true if we will want to say something if a goto statement |
586 | crosses DECL. */ | |
587 | ||
588 | static bool | |
589 | decl_jump_unsafe (tree decl) | |
590 | { | |
da579dbb | 591 | if (error_operand_p (decl)) |
f583ffd4 | 592 | return false; |
593 | ||
594 | /* Always warn about crossing variably modified types. */ | |
595 | if ((TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == TYPE_DECL) | |
596 | && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) | |
597 | return true; | |
598 | ||
599 | /* Otherwise, only warn if -Wgoto-misses-init and this is an | |
600 | initialized automatic decl. */ | |
601 | if (warn_jump_misses_init | |
602 | && TREE_CODE (decl) == VAR_DECL | |
603 | && !TREE_STATIC (decl) | |
604 | && DECL_INITIAL (decl) != NULL_TREE) | |
605 | return true; | |
606 | ||
607 | return false; | |
608 | } | |
609 | \f | |
88da234d | 610 | |
51ef3909 | 611 | void |
1cae46be | 612 | c_print_identifier (FILE *file, tree node, int indent) |
51ef3909 | 613 | { |
393b349a | 614 | print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4); |
615 | print_node (file, "tag", I_TAG_DECL (node), indent + 4); | |
616 | print_node (file, "label", I_LABEL_DECL (node), indent + 4); | |
5c6e5756 | 617 | if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN) |
518796ad | 618 | { |
619 | tree rid = ridpointers[C_RID_CODE (node)]; | |
620 | indent_to (file, indent + 4); | |
038ca0d1 | 621 | fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"", |
6f817829 | 622 | (void *) rid, IDENTIFIER_POINTER (rid)); |
518796ad | 623 | } |
51ef3909 | 624 | } |
393b349a | 625 | |
626 | /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL, | |
627 | which may be any of several kinds of DECL or TYPE or error_mark_node, | |
628 | in the scope SCOPE. */ | |
629 | static void | |
6fb80942 | 630 | bind (tree name, tree decl, struct c_scope *scope, bool invisible, |
631 | bool nested, location_t locus) | |
393b349a | 632 | { |
633 | struct c_binding *b, **here; | |
634 | ||
635 | if (binding_freelist) | |
636 | { | |
637 | b = binding_freelist; | |
638 | binding_freelist = b->prev; | |
639 | } | |
640 | else | |
ba72912a | 641 | b = ggc_alloc_c_binding (); |
393b349a | 642 | |
643 | b->shadowed = 0; | |
644 | b->decl = decl; | |
645 | b->id = name; | |
4194491a | 646 | b->depth = scope->depth; |
647 | b->invisible = invisible; | |
648 | b->nested = nested; | |
606a02e3 | 649 | b->inner_comp = 0; |
843bd2fa | 650 | b->in_struct = 0; |
6fb80942 | 651 | b->locus = locus; |
606a02e3 | 652 | |
f805d53d | 653 | b->u.type = NULL; |
393b349a | 654 | |
655 | b->prev = scope->bindings; | |
656 | scope->bindings = b; | |
657 | ||
f583ffd4 | 658 | if (decl_jump_unsafe (decl)) |
659 | scope->has_jump_unsafe_decl = 1; | |
660 | ||
393b349a | 661 | if (!name) |
662 | return; | |
663 | ||
664 | switch (TREE_CODE (decl)) | |
665 | { | |
666 | case LABEL_DECL: here = &I_LABEL_BINDING (name); break; | |
667 | case ENUMERAL_TYPE: | |
668 | case UNION_TYPE: | |
669 | case RECORD_TYPE: here = &I_TAG_BINDING (name); break; | |
670 | case VAR_DECL: | |
671 | case FUNCTION_DECL: | |
672 | case TYPE_DECL: | |
673 | case CONST_DECL: | |
674 | case PARM_DECL: | |
675 | case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break; | |
676 | ||
677 | default: | |
231bd014 | 678 | gcc_unreachable (); |
393b349a | 679 | } |
680 | ||
681 | /* Locate the appropriate place in the chain of shadowed decls | |
682 | to insert this binding. Normally, scope == current_scope and | |
683 | this does nothing. */ | |
4194491a | 684 | while (*here && (*here)->depth > scope->depth) |
393b349a | 685 | here = &(*here)->shadowed; |
686 | ||
687 | b->shadowed = *here; | |
688 | *here = b; | |
689 | } | |
690 | ||
691 | /* Clear the binding structure B, stick it on the binding_freelist, | |
692 | and return the former value of b->prev. This is used by pop_scope | |
693 | and get_parm_info to iterate destructively over all the bindings | |
694 | from a given scope. */ | |
695 | static struct c_binding * | |
696 | free_binding_and_advance (struct c_binding *b) | |
697 | { | |
698 | struct c_binding *prev = b->prev; | |
699 | ||
4194491a | 700 | memset (b, 0, sizeof (struct c_binding)); |
393b349a | 701 | b->prev = binding_freelist; |
702 | binding_freelist = b; | |
703 | ||
704 | return prev; | |
705 | } | |
706 | ||
f805d53d | 707 | /* Bind a label. Like bind, but skip fields which aren't used for |
708 | labels, and add the LABEL_VARS value. */ | |
709 | static void | |
710 | bind_label (tree name, tree label, struct c_scope *scope, | |
711 | struct c_label_vars *label_vars) | |
712 | { | |
713 | struct c_binding *b; | |
714 | ||
715 | bind (name, label, scope, /*invisible=*/false, /*nested=*/false, | |
716 | UNKNOWN_LOCATION); | |
717 | ||
718 | scope->has_label_bindings = true; | |
719 | ||
720 | b = scope->bindings; | |
721 | gcc_assert (b->decl == label); | |
722 | label_vars->shadowed = b->u.label; | |
723 | b->u.label = label_vars; | |
724 | } | |
51ef3909 | 725 | \f |
fc7d78c7 | 726 | /* Hook called at end of compilation to assume 1 elt |
6e899616 | 727 | for a file-scope tentative array defn that wasn't complete before. */ |
4214af46 | 728 | |
fc7d78c7 | 729 | void |
1cae46be | 730 | c_finish_incomplete_decl (tree decl) |
fc7d78c7 | 731 | { |
d7f020e8 | 732 | if (TREE_CODE (decl) == VAR_DECL) |
fc7d78c7 | 733 | { |
734 | tree type = TREE_TYPE (decl); | |
d7f020e8 | 735 | if (type != error_mark_node |
736 | && TREE_CODE (type) == ARRAY_TYPE | |
84166705 | 737 | && !DECL_EXTERNAL (decl) |
d7f020e8 | 738 | && TYPE_DOMAIN (type) == 0) |
fc7d78c7 | 739 | { |
e60a6f7b | 740 | warning_at (DECL_SOURCE_LOCATION (decl), |
741 | 0, "array %q+D assumed to have one element", decl); | |
d7f020e8 | 742 | |
c271bdb2 | 743 | complete_array_type (&TREE_TYPE (decl), NULL_TREE, true); |
fc7d78c7 | 744 | |
d43c4681 | 745 | relayout_decl (decl); |
fc7d78c7 | 746 | } |
747 | } | |
748 | } | |
749 | \f | |
551ed71a | 750 | /* Record that inline function FUNC contains a reference (location |
751 | LOC) to static DECL (file-scope or function-local according to | |
752 | TYPE). */ | |
753 | ||
754 | void | |
755 | record_inline_static (location_t loc, tree func, tree decl, | |
756 | enum c_inline_static_type type) | |
757 | { | |
ba72912a | 758 | struct c_inline_static *csi = ggc_alloc_c_inline_static (); |
551ed71a | 759 | csi->location = loc; |
760 | csi->function = func; | |
761 | csi->static_decl = decl; | |
762 | csi->type = type; | |
763 | csi->next = c_inline_statics; | |
764 | c_inline_statics = csi; | |
765 | } | |
766 | ||
767 | /* Check for references to static declarations in inline functions at | |
768 | the end of the translation unit and diagnose them if the functions | |
769 | are still inline definitions. */ | |
770 | ||
771 | static void | |
772 | check_inline_statics (void) | |
773 | { | |
774 | struct c_inline_static *csi; | |
775 | for (csi = c_inline_statics; csi; csi = csi->next) | |
776 | { | |
777 | if (DECL_EXTERNAL (csi->function)) | |
778 | switch (csi->type) | |
779 | { | |
780 | case csi_internal: | |
781 | pedwarn (csi->location, 0, | |
782 | "%qD is static but used in inline function %qD " | |
783 | "which is not static", csi->static_decl, csi->function); | |
784 | break; | |
785 | case csi_modifiable: | |
786 | pedwarn (csi->location, 0, | |
787 | "%q+D is static but declared in inline function %qD " | |
788 | "which is not static", csi->static_decl, csi->function); | |
789 | break; | |
790 | default: | |
791 | gcc_unreachable (); | |
792 | } | |
793 | } | |
794 | c_inline_statics = NULL; | |
795 | } | |
796 | \f | |
f805d53d | 797 | /* Fill in a c_spot_bindings structure. If DEFINING is true, set it |
798 | for the current state, otherwise set it to uninitialized. */ | |
799 | ||
800 | static void | |
801 | set_spot_bindings (struct c_spot_bindings *p, bool defining) | |
802 | { | |
803 | if (defining) | |
804 | { | |
805 | p->scope = current_scope; | |
806 | p->bindings_in_scope = current_scope->bindings; | |
807 | } | |
808 | else | |
809 | { | |
810 | p->scope = NULL; | |
811 | p->bindings_in_scope = NULL; | |
812 | } | |
813 | p->stmt_exprs = 0; | |
814 | p->left_stmt_expr = false; | |
815 | } | |
816 | ||
f805d53d | 817 | /* Update spot bindings P as we pop out of SCOPE. Return true if we |
818 | should push decls for a label. */ | |
819 | ||
820 | static bool | |
821 | update_spot_bindings (struct c_scope *scope, struct c_spot_bindings *p) | |
822 | { | |
823 | if (p->scope != scope) | |
824 | { | |
825 | /* This label or goto is defined in some other scope, or it is a | |
826 | label which is not yet defined. There is nothing to | |
827 | update. */ | |
828 | return false; | |
829 | } | |
830 | ||
831 | /* Adjust the spot bindings to refer to the bindings already defined | |
832 | in the enclosing scope. */ | |
833 | p->scope = scope->outer; | |
834 | p->bindings_in_scope = p->scope->bindings; | |
835 | ||
836 | return true; | |
837 | } | |
838 | \f | |
c17b85ea | 839 | /* The Objective-C front-end often needs to determine the current scope. */ |
840 | ||
841 | void * | |
99d7d801 | 842 | objc_get_current_scope (void) |
c17b85ea | 843 | { |
844 | return current_scope; | |
845 | } | |
846 | ||
847 | /* The following function is used only by Objective-C. It needs to live here | |
848 | because it accesses the innards of c_scope. */ | |
849 | ||
850 | void | |
851 | objc_mark_locals_volatile (void *enclosing_blk) | |
852 | { | |
853 | struct c_scope *scope; | |
393b349a | 854 | struct c_binding *b; |
d9cf68bf | 855 | |
856 | for (scope = current_scope; | |
c17b85ea | 857 | scope && scope != enclosing_blk; |
858 | scope = scope->outer) | |
859 | { | |
393b349a | 860 | for (b = scope->bindings; b; b = b->prev) |
34d3c5de | 861 | objc_volatilize_decl (b->decl); |
393b349a | 862 | |
c17b85ea | 863 | /* Do not climb up past the current function. */ |
864 | if (scope->function_body) | |
865 | break; | |
d9cf68bf | 866 | } |
867 | } | |
868 | ||
1d2bb655 | 869 | /* Return true if we are in the global binding level. */ |
51ef3909 | 870 | |
1d2bb655 | 871 | bool |
1cae46be | 872 | global_bindings_p (void) |
51ef3909 | 873 | { |
b354cec8 | 874 | return current_scope == file_scope; |
51ef3909 | 875 | } |
876 | ||
877 | void | |
1cae46be | 878 | keep_next_level (void) |
51ef3909 | 879 | { |
bdc33d98 | 880 | keep_next_level_flag = true; |
51ef3909 | 881 | } |
882 | ||
3ae3a17f | 883 | /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */ |
884 | ||
885 | void | |
886 | set_float_const_decimal64 (void) | |
887 | { | |
888 | current_scope->float_const_decimal64 = true; | |
889 | } | |
890 | ||
891 | /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */ | |
892 | ||
893 | void | |
894 | clear_float_const_decimal64 (void) | |
895 | { | |
896 | current_scope->float_const_decimal64 = false; | |
897 | } | |
898 | ||
899 | /* Return nonzero if an unsuffixed float constant is _Decimal64. */ | |
900 | ||
901 | bool | |
902 | float_const_decimal64_p (void) | |
903 | { | |
904 | return current_scope->float_const_decimal64; | |
905 | } | |
906 | ||
6e899616 | 907 | /* Identify this scope as currently being filled with parameters. */ |
51ef3909 | 908 | |
909 | void | |
2b652cf3 | 910 | declare_parm_level (void) |
51ef3909 | 911 | { |
6e899616 | 912 | current_scope->parm_flag = true; |
51ef3909 | 913 | } |
914 | ||
51ef3909 | 915 | void |
393b349a | 916 | push_scope (void) |
51ef3909 | 917 | { |
e69f6ec7 | 918 | if (next_is_function_body) |
51ef3909 | 919 | { |
31ddae9f | 920 | /* This is the transition from the parameters to the top level |
921 | of the function body. These are the same scope | |
6e899616 | 922 | (C99 6.2.1p4,6) so we do not push another scope structure. |
e69f6ec7 | 923 | next_is_function_body is set only by store_parm_decls, which |
924 | in turn is called when and only when we are about to | |
925 | encounter the opening curly brace for the function body. | |
31ddae9f | 926 | |
e69f6ec7 | 927 | The outermost block of a function always gets a BLOCK node, |
928 | because the debugging output routines expect that each | |
7981458e | 929 | function has at least one BLOCK. */ |
6e899616 | 930 | current_scope->parm_flag = false; |
931 | current_scope->function_body = true; | |
e69f6ec7 | 932 | current_scope->keep = true; |
6e899616 | 933 | current_scope->outer_function = current_function_scope; |
934 | current_function_scope = current_scope; | |
bdc33d98 | 935 | |
936 | keep_next_level_flag = false; | |
e69f6ec7 | 937 | next_is_function_body = false; |
3ae3a17f | 938 | |
939 | /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */ | |
940 | if (current_scope->outer) | |
941 | current_scope->float_const_decimal64 | |
942 | = current_scope->outer->float_const_decimal64; | |
943 | else | |
944 | current_scope->float_const_decimal64 = false; | |
51ef3909 | 945 | } |
31ddae9f | 946 | else |
947 | { | |
393b349a | 948 | struct c_scope *scope; |
949 | if (scope_freelist) | |
950 | { | |
951 | scope = scope_freelist; | |
952 | scope_freelist = scope->outer; | |
953 | } | |
954 | else | |
ba72912a | 955 | scope = ggc_alloc_cleared_c_scope (); |
51ef3909 | 956 | |
3ae3a17f | 957 | /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */ |
958 | if (current_scope) | |
959 | scope->float_const_decimal64 = current_scope->float_const_decimal64; | |
960 | else | |
961 | scope->float_const_decimal64 = false; | |
962 | ||
6e899616 | 963 | scope->keep = keep_next_level_flag; |
964 | scope->outer = current_scope; | |
393b349a | 965 | scope->depth = current_scope ? (current_scope->depth + 1) : 0; |
966 | ||
967 | /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but | |
968 | possible. */ | |
969 | if (current_scope && scope->depth == 0) | |
970 | { | |
971 | scope->depth--; | |
4742c91a | 972 | sorry ("GCC supports only %u nested scopes", scope->depth); |
393b349a | 973 | } |
14338e9a | 974 | |
6e899616 | 975 | current_scope = scope; |
976 | keep_next_level_flag = false; | |
31ddae9f | 977 | } |
cbf025c5 | 978 | } |
4214af46 | 979 | |
f805d53d | 980 | /* This is called when we are leaving SCOPE. For each label defined |
981 | in SCOPE, add any appropriate decls to its decls_in_scope fields. | |
982 | These are the decls whose initialization will be skipped by a goto | |
983 | later in the function. */ | |
984 | ||
985 | static void | |
986 | update_label_decls (struct c_scope *scope) | |
987 | { | |
988 | struct c_scope *s; | |
989 | ||
990 | s = scope; | |
991 | while (s != NULL) | |
992 | { | |
993 | if (s->has_label_bindings) | |
994 | { | |
995 | struct c_binding *b; | |
996 | ||
997 | for (b = s->bindings; b != NULL; b = b->prev) | |
998 | { | |
999 | struct c_label_vars *label_vars; | |
1000 | struct c_binding *b1; | |
f583ffd4 | 1001 | bool hjud; |
f805d53d | 1002 | unsigned int ix; |
1003 | struct c_goto_bindings *g; | |
1004 | ||
1005 | if (TREE_CODE (b->decl) != LABEL_DECL) | |
1006 | continue; | |
1007 | label_vars = b->u.label; | |
1008 | ||
1009 | b1 = label_vars->label_bindings.bindings_in_scope; | |
f583ffd4 | 1010 | if (label_vars->label_bindings.scope == NULL) |
1011 | hjud = false; | |
1012 | else | |
1013 | hjud = label_vars->label_bindings.scope->has_jump_unsafe_decl; | |
f805d53d | 1014 | if (update_spot_bindings (scope, &label_vars->label_bindings)) |
1015 | { | |
1016 | /* This label is defined in this scope. */ | |
f583ffd4 | 1017 | if (hjud) |
f805d53d | 1018 | { |
f583ffd4 | 1019 | for (; b1 != NULL; b1 = b1->prev) |
1020 | { | |
1021 | /* A goto from later in the function to this | |
1022 | label will never see the initialization | |
1023 | of B1, if any. Save it to issue a | |
1024 | warning if needed. */ | |
1025 | if (decl_jump_unsafe (b1->decl)) | |
f1f41a6c | 1026 | vec_safe_push(label_vars->decls_in_scope, b1->decl); |
f583ffd4 | 1027 | } |
f805d53d | 1028 | } |
1029 | } | |
1030 | ||
1031 | /* Update the bindings of any goto statements associated | |
1032 | with this label. */ | |
f1f41a6c | 1033 | FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g) |
f805d53d | 1034 | update_spot_bindings (scope, &g->goto_bindings); |
1035 | } | |
1036 | } | |
1037 | ||
1038 | /* Don't search beyond the current function. */ | |
1039 | if (s == current_function_scope) | |
1040 | break; | |
1041 | ||
1042 | s = s->outer; | |
1043 | } | |
1044 | } | |
1045 | ||
b3e83e1e | 1046 | /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */ |
1047 | ||
1048 | static void | |
1049 | set_type_context (tree type, tree context) | |
1050 | { | |
1051 | for (type = TYPE_MAIN_VARIANT (type); type; | |
1052 | type = TYPE_NEXT_VARIANT (type)) | |
1053 | TYPE_CONTEXT (type) = context; | |
1054 | } | |
1055 | ||
6e899616 | 1056 | /* Exit a scope. Restore the state of the identifier-decl mappings |
393b349a | 1057 | that were in effect when this scope was entered. Return a BLOCK |
1058 | node containing all the DECLs in this scope that are of interest | |
1059 | to debug info generation. */ | |
51ef3909 | 1060 | |
1061 | tree | |
393b349a | 1062 | pop_scope (void) |
51ef3909 | 1063 | { |
3bdb6310 | 1064 | struct c_scope *scope = current_scope; |
393b349a | 1065 | tree block, context, p; |
1066 | struct c_binding *b; | |
a0c21e2b | 1067 | |
393b349a | 1068 | bool functionbody = scope->function_body; |
1069 | bool keep = functionbody || scope->keep || scope->bindings; | |
3bdb6310 | 1070 | |
f805d53d | 1071 | update_label_decls (scope); |
f5d156fd | 1072 | |
3bdb6310 | 1073 | /* If appropriate, create a BLOCK to record the decls for the life |
1074 | of this function. */ | |
1075 | block = 0; | |
1076 | if (keep) | |
1077 | { | |
1078 | block = make_node (BLOCK); | |
3bdb6310 | 1079 | BLOCK_SUBBLOCKS (block) = scope->blocks; |
1080 | TREE_USED (block) = 1; | |
3bdb6310 | 1081 | |
393b349a | 1082 | /* In each subblock, record that this is its superior. */ |
93110716 | 1083 | for (p = scope->blocks; p; p = BLOCK_CHAIN (p)) |
393b349a | 1084 | BLOCK_SUPERCONTEXT (p) = block; |
3bdb6310 | 1085 | |
393b349a | 1086 | BLOCK_VARS (block) = 0; |
1087 | } | |
31ddae9f | 1088 | |
393b349a | 1089 | /* The TYPE_CONTEXTs for all of the tagged types belonging to this |
1090 | scope must be set so that they point to the appropriate | |
1091 | construct, i.e. either to the current FUNCTION_DECL node, or | |
1092 | else to the BLOCK node we just constructed. | |
3bdb6310 | 1093 | |
393b349a | 1094 | Note that for tagged types whose scope is just the formal |
1095 | parameter list for some function type specification, we can't | |
1096 | properly set their TYPE_CONTEXTs here, because we don't have a | |
1097 | pointer to the appropriate FUNCTION_TYPE node readily available | |
1098 | to us. For those cases, the TYPE_CONTEXTs of the relevant tagged | |
1099 | type nodes get set in `grokdeclarator' as soon as we have created | |
1100 | the FUNCTION_TYPE node which will represent the "scope" for these | |
1101 | "parameter list local" tagged types. */ | |
1102 | if (scope->function_body) | |
1103 | context = current_function_decl; | |
1104 | else if (scope == file_scope) | |
4d714d55 | 1105 | { |
23bdc9ca | 1106 | tree file_decl = build_translation_unit_decl (NULL_TREE); |
4d714d55 | 1107 | context = file_decl; |
1108 | } | |
393b349a | 1109 | else |
1110 | context = block; | |
3bdb6310 | 1111 | |
393b349a | 1112 | /* Clear all bindings in this scope. */ |
1113 | for (b = scope->bindings; b; b = free_binding_and_advance (b)) | |
31ddae9f | 1114 | { |
393b349a | 1115 | p = b->decl; |
3bdb6310 | 1116 | switch (TREE_CODE (p)) |
bdc33d98 | 1117 | { |
3bdb6310 | 1118 | case LABEL_DECL: |
393b349a | 1119 | /* Warnings for unused labels, errors for undefined labels. */ |
3bdb6310 | 1120 | if (TREE_USED (p) && !DECL_INITIAL (p)) |
bdc33d98 | 1121 | { |
3cf8b391 | 1122 | error ("label %q+D used but not defined", p); |
3bdb6310 | 1123 | DECL_INITIAL (p) = error_mark_node; |
bdc33d98 | 1124 | } |
48e1416a | 1125 | else |
92fccaaa | 1126 | warn_for_unused_label (p); |
1127 | ||
393b349a | 1128 | /* Labels go in BLOCK_VARS. */ |
1767a056 | 1129 | DECL_CHAIN (p) = BLOCK_VARS (block); |
393b349a | 1130 | BLOCK_VARS (block) = p; |
231bd014 | 1131 | gcc_assert (I_LABEL_BINDING (b->id) == b); |
a0c938f0 | 1132 | I_LABEL_BINDING (b->id) = b->shadowed; |
f805d53d | 1133 | |
1134 | /* Also pop back to the shadowed label_vars. */ | |
1135 | release_tree_vector (b->u.label->decls_in_scope); | |
1136 | b->u.label = b->u.label->shadowed; | |
a0c938f0 | 1137 | break; |
31ddae9f | 1138 | |
393b349a | 1139 | case ENUMERAL_TYPE: |
1140 | case UNION_TYPE: | |
1141 | case RECORD_TYPE: | |
b3e83e1e | 1142 | set_type_context (p, context); |
393b349a | 1143 | |
1144 | /* Types may not have tag-names, in which case the type | |
1145 | appears in the bindings list with b->id NULL. */ | |
1146 | if (b->id) | |
1147 | { | |
231bd014 | 1148 | gcc_assert (I_TAG_BINDING (b->id) == b); |
393b349a | 1149 | I_TAG_BINDING (b->id) = b->shadowed; |
1150 | } | |
a0c938f0 | 1151 | break; |
31ddae9f | 1152 | |
3bdb6310 | 1153 | case FUNCTION_DECL: |
393b349a | 1154 | /* Propagate TREE_ADDRESSABLE from nested functions to their |
1155 | containing functions. */ | |
84166705 | 1156 | if (!TREE_ASM_WRITTEN (p) |
3bdb6310 | 1157 | && DECL_INITIAL (p) != 0 |
1158 | && TREE_ADDRESSABLE (p) | |
1159 | && DECL_ABSTRACT_ORIGIN (p) != 0 | |
1160 | && DECL_ABSTRACT_ORIGIN (p) != p) | |
1161 | TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1; | |
8a1f0315 | 1162 | if (!DECL_EXTERNAL (p) |
c42cc79e | 1163 | && !DECL_INITIAL (p) |
1164 | && scope != file_scope | |
1165 | && scope != external_scope) | |
8a1f0315 | 1166 | { |
3cf8b391 | 1167 | error ("nested function %q+D declared but never defined", p); |
8a1f0315 | 1168 | undef_nested_function = true; |
1169 | } | |
c42cc79e | 1170 | else if (DECL_DECLARED_INLINE_P (p) |
1171 | && TREE_PUBLIC (p) | |
709cdea6 | 1172 | && !DECL_INITIAL (p)) |
1173 | { | |
1174 | /* C99 6.7.4p6: "a function with external linkage... declared | |
1175 | with an inline function specifier ... shall also be defined | |
1176 | in the same translation unit." */ | |
1177 | if (!flag_gnu89_inline) | |
1178 | pedwarn (input_location, 0, | |
1179 | "inline function %q+D declared but never defined", p); | |
1180 | DECL_EXTERNAL (p) = 1; | |
1181 | } | |
c42cc79e | 1182 | |
393b349a | 1183 | goto common_symbol; |
3bdb6310 | 1184 | |
1185 | case VAR_DECL: | |
491e04ef | 1186 | /* Warnings for unused variables. */ |
abc6c64f | 1187 | if ((!TREE_USED (p) || !DECL_READ_P (p)) |
8babbffa | 1188 | && !TREE_NO_WARNING (p) |
3bdb6310 | 1189 | && !DECL_IN_SYSTEM_HEADER (p) |
1190 | && DECL_NAME (p) | |
393b349a | 1191 | && !DECL_ARTIFICIAL (p) |
f98b02b2 | 1192 | && scope != file_scope |
a0c938f0 | 1193 | && scope != external_scope) |
abc6c64f | 1194 | { |
1195 | if (!TREE_USED (p)) | |
1196 | warning (OPT_Wunused_variable, "unused variable %q+D", p); | |
1197 | else if (DECL_CONTEXT (p) == current_function_decl) | |
1198 | warning_at (DECL_SOURCE_LOCATION (p), | |
1199 | OPT_Wunused_but_set_variable, | |
1200 | "variable %qD set but not used", p); | |
1201 | } | |
393b349a | 1202 | |
606a02e3 | 1203 | if (b->inner_comp) |
1204 | { | |
3cf8b391 | 1205 | error ("type of array %q+D completed incompatibly with" |
1206 | " implicit initialization", p); | |
606a02e3 | 1207 | } |
1208 | ||
aab2cf92 | 1209 | /* Fall through. */ |
393b349a | 1210 | case TYPE_DECL: |
1211 | case CONST_DECL: | |
1212 | common_symbol: | |
1213 | /* All of these go in BLOCK_VARS, but only if this is the | |
1214 | binding in the home scope. */ | |
4194491a | 1215 | if (!b->nested) |
393b349a | 1216 | { |
1767a056 | 1217 | DECL_CHAIN (p) = BLOCK_VARS (block); |
393b349a | 1218 | BLOCK_VARS (block) = p; |
1219 | } | |
add5c2ae | 1220 | else if (VAR_OR_FUNCTION_DECL_P (p) && scope != file_scope) |
6fb80942 | 1221 | { |
1222 | /* For block local externs add a special | |
1223 | DECL_EXTERNAL decl for debug info generation. */ | |
1224 | tree extp = copy_node (p); | |
1225 | ||
1226 | DECL_EXTERNAL (extp) = 1; | |
1227 | TREE_STATIC (extp) = 0; | |
1228 | TREE_PUBLIC (extp) = 1; | |
1229 | DECL_INITIAL (extp) = NULL_TREE; | |
1230 | DECL_LANG_SPECIFIC (extp) = NULL; | |
1231 | DECL_CONTEXT (extp) = current_function_decl; | |
1232 | if (TREE_CODE (p) == FUNCTION_DECL) | |
1233 | { | |
1234 | DECL_RESULT (extp) = NULL_TREE; | |
1235 | DECL_SAVED_TREE (extp) = NULL_TREE; | |
1236 | DECL_STRUCT_FUNCTION (extp) = NULL; | |
1237 | } | |
1238 | if (b->locus != UNKNOWN_LOCATION) | |
1239 | DECL_SOURCE_LOCATION (extp) = b->locus; | |
1767a056 | 1240 | DECL_CHAIN (extp) = BLOCK_VARS (block); |
6fb80942 | 1241 | BLOCK_VARS (block) = extp; |
1242 | } | |
262b29f2 | 1243 | /* If this is the file scope set DECL_CONTEXT of each decl to |
1244 | the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p | |
1245 | work. */ | |
1246 | if (scope == file_scope) | |
b3e83e1e | 1247 | { |
1248 | DECL_CONTEXT (p) = context; | |
262b29f2 | 1249 | if (TREE_CODE (p) == TYPE_DECL |
1250 | && TREE_TYPE (p) != error_mark_node) | |
b3e83e1e | 1251 | set_type_context (TREE_TYPE (p), context); |
1252 | } | |
f74be9a1 | 1253 | |
393b349a | 1254 | /* Fall through. */ |
1255 | /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have | |
1256 | already been put there by store_parm_decls. Unused- | |
1257 | parameter warnings are handled by function.c. | |
1258 | error_mark_node obviously does not go in BLOCK_VARS and | |
1259 | does not get unused-variable warnings. */ | |
1260 | case PARM_DECL: | |
1261 | case ERROR_MARK: | |
1262 | /* It is possible for a decl not to have a name. We get | |
1263 | here with b->id NULL in this case. */ | |
1264 | if (b->id) | |
3bdb6310 | 1265 | { |
231bd014 | 1266 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); |
393b349a | 1267 | I_SYMBOL_BINDING (b->id) = b->shadowed; |
f805d53d | 1268 | if (b->shadowed && b->shadowed->u.type) |
1269 | TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type; | |
3bdb6310 | 1270 | } |
1271 | break; | |
393b349a | 1272 | |
1273 | default: | |
231bd014 | 1274 | gcc_unreachable (); |
3bdb6310 | 1275 | } |
1276 | } | |
31ddae9f | 1277 | |
14338e9a | 1278 | |
393b349a | 1279 | /* Dispose of the block that we just made inside some higher level. */ |
1280 | if ((scope->function_body || scope == file_scope) && context) | |
31ddae9f | 1281 | { |
393b349a | 1282 | DECL_INITIAL (context) = block; |
1283 | BLOCK_SUPERCONTEXT (block) = context; | |
31ddae9f | 1284 | } |
3bdb6310 | 1285 | else if (scope->outer) |
8862e8ce | 1286 | { |
3bdb6310 | 1287 | if (block) |
1288 | SCOPE_LIST_APPEND (scope->outer, blocks, block); | |
1289 | /* If we did not make a block for the scope just exited, any | |
1290 | blocks made for inner scopes must be carried forward so they | |
1291 | will later become subblocks of something else. */ | |
1292 | else if (scope->blocks) | |
1293 | SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks); | |
8862e8ce | 1294 | } |
51ef3909 | 1295 | |
6e899616 | 1296 | /* Pop the current scope, and free the structure for reuse. */ |
393b349a | 1297 | current_scope = scope->outer; |
1298 | if (scope->function_body) | |
1299 | current_function_scope = scope->outer_function; | |
1300 | ||
1301 | memset (scope, 0, sizeof (struct c_scope)); | |
1302 | scope->outer = scope_freelist; | |
1303 | scope_freelist = scope; | |
51ef3909 | 1304 | |
51ef3909 | 1305 | return block; |
1306 | } | |
8862e8ce | 1307 | |
393b349a | 1308 | void |
1309 | push_file_scope (void) | |
1310 | { | |
1311 | tree decl; | |
393b349a | 1312 | |
3d738236 | 1313 | if (file_scope) |
1314 | return; | |
1315 | ||
393b349a | 1316 | push_scope (); |
1317 | file_scope = current_scope; | |
1318 | ||
1319 | start_fname_decls (); | |
1320 | ||
1767a056 | 1321 | for (decl = visible_builtins; decl; decl = DECL_CHAIN (decl)) |
4194491a | 1322 | bind (DECL_NAME (decl), decl, file_scope, |
6fb80942 | 1323 | /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl)); |
393b349a | 1324 | } |
1325 | ||
1326 | void | |
1327 | pop_file_scope (void) | |
1328 | { | |
1329 | /* In case there were missing closebraces, get us back to the global | |
1330 | binding level. */ | |
1331 | while (current_scope != file_scope) | |
1332 | pop_scope (); | |
1333 | ||
1334 | /* __FUNCTION__ is defined at file scope (""). This | |
1335 | call may not be necessary as my tests indicate it | |
1336 | still works without it. */ | |
1337 | finish_fname_decls (); | |
1338 | ||
551ed71a | 1339 | check_inline_statics (); |
1340 | ||
aea7e1dc | 1341 | /* This is the point to write out a PCH if we're doing that. |
1342 | In that case we do not want to do anything else. */ | |
393b349a | 1343 | if (pch_file) |
aea7e1dc | 1344 | { |
1345 | c_common_write_pch (); | |
1346 | return; | |
1347 | } | |
393b349a | 1348 | |
aea7e1dc | 1349 | /* Pop off the file scope and close this translation unit. */ |
393b349a | 1350 | pop_scope (); |
1351 | file_scope = 0; | |
8bc09a74 | 1352 | |
1353 | maybe_apply_pending_pragma_weaks (); | |
393b349a | 1354 | } |
f805d53d | 1355 | \f |
1356 | /* Adjust the bindings for the start of a statement expression. */ | |
1357 | ||
1358 | void | |
1359 | c_bindings_start_stmt_expr (struct c_spot_bindings* switch_bindings) | |
1360 | { | |
1361 | struct c_scope *scope; | |
1362 | ||
1363 | for (scope = current_scope; scope != NULL; scope = scope->outer) | |
1364 | { | |
1365 | struct c_binding *b; | |
1366 | ||
1367 | if (!scope->has_label_bindings) | |
1368 | continue; | |
1369 | ||
1370 | for (b = scope->bindings; b != NULL; b = b->prev) | |
1371 | { | |
1372 | struct c_label_vars *label_vars; | |
1373 | unsigned int ix; | |
1374 | struct c_goto_bindings *g; | |
1375 | ||
1376 | if (TREE_CODE (b->decl) != LABEL_DECL) | |
1377 | continue; | |
1378 | label_vars = b->u.label; | |
1379 | ++label_vars->label_bindings.stmt_exprs; | |
f1f41a6c | 1380 | FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g) |
f805d53d | 1381 | ++g->goto_bindings.stmt_exprs; |
1382 | } | |
1383 | } | |
1384 | ||
1385 | if (switch_bindings != NULL) | |
1386 | ++switch_bindings->stmt_exprs; | |
1387 | } | |
1388 | ||
1389 | /* Adjust the bindings for the end of a statement expression. */ | |
1390 | ||
1391 | void | |
1392 | c_bindings_end_stmt_expr (struct c_spot_bindings *switch_bindings) | |
1393 | { | |
1394 | struct c_scope *scope; | |
1395 | ||
1396 | for (scope = current_scope; scope != NULL; scope = scope->outer) | |
1397 | { | |
1398 | struct c_binding *b; | |
1399 | ||
1400 | if (!scope->has_label_bindings) | |
1401 | continue; | |
1402 | ||
1403 | for (b = scope->bindings; b != NULL; b = b->prev) | |
1404 | { | |
1405 | struct c_label_vars *label_vars; | |
1406 | unsigned int ix; | |
1407 | struct c_goto_bindings *g; | |
1408 | ||
1409 | if (TREE_CODE (b->decl) != LABEL_DECL) | |
1410 | continue; | |
1411 | label_vars = b->u.label; | |
1412 | --label_vars->label_bindings.stmt_exprs; | |
1413 | if (label_vars->label_bindings.stmt_exprs < 0) | |
1414 | { | |
1415 | label_vars->label_bindings.left_stmt_expr = true; | |
1416 | label_vars->label_bindings.stmt_exprs = 0; | |
1417 | } | |
f1f41a6c | 1418 | FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g) |
f805d53d | 1419 | { |
1420 | --g->goto_bindings.stmt_exprs; | |
1421 | if (g->goto_bindings.stmt_exprs < 0) | |
1422 | { | |
1423 | g->goto_bindings.left_stmt_expr = true; | |
1424 | g->goto_bindings.stmt_exprs = 0; | |
1425 | } | |
1426 | } | |
1427 | } | |
1428 | } | |
393b349a | 1429 | |
f805d53d | 1430 | if (switch_bindings != NULL) |
1431 | { | |
1432 | --switch_bindings->stmt_exprs; | |
1433 | gcc_assert (switch_bindings->stmt_exprs >= 0); | |
1434 | } | |
1435 | } | |
51ef3909 | 1436 | \f |
51ef3909 | 1437 | /* Push a definition or a declaration of struct, union or enum tag "name". |
1438 | "type" should be the type node. | |
e60a6f7b | 1439 | We assume that the tag "name" is not already defined, and has a location |
1440 | of LOC. | |
51ef3909 | 1441 | |
1442 | Note that the definition may really be just a forward reference. | |
1443 | In that case, the TYPE_SIZE will be zero. */ | |
1444 | ||
393b349a | 1445 | static void |
e60a6f7b | 1446 | pushtag (location_t loc, tree name, tree type) |
51ef3909 | 1447 | { |
b3924a2c | 1448 | /* Record the identifier as the type's name if it has none. */ |
393b349a | 1449 | if (name && !TYPE_NAME (type)) |
1450 | TYPE_NAME (type) = name; | |
0b09525f | 1451 | bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false, loc); |
c275c235 | 1452 | |
51ef3909 | 1453 | /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the |
6e899616 | 1454 | tagged type we just added to the current scope. This fake |
51ef3909 | 1455 | NULL-named TYPE_DECL node helps dwarfout.c to know when it needs |
df5e872e | 1456 | to output a representation of a tagged type, and it also gives |
51ef3909 | 1457 | us a convenient place to record the "scope start" address for the |
1458 | tagged type. */ | |
1459 | ||
e60a6f7b | 1460 | TYPE_STUB_DECL (type) = pushdecl (build_decl (loc, |
1461 | TYPE_DECL, NULL_TREE, type)); | |
464217f3 | 1462 | |
1463 | /* An approximation for now, so we can tell this is a function-scope tag. | |
393b349a | 1464 | This will be updated in pop_scope. */ |
464217f3 | 1465 | TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type)); |
26dbec0a | 1466 | |
1467 | if (warn_cxx_compat && name != NULL_TREE) | |
1468 | { | |
1469 | struct c_binding *b = I_SYMBOL_BINDING (name); | |
1470 | ||
1471 | if (b != NULL | |
1472 | && b->decl != NULL_TREE | |
1473 | && TREE_CODE (b->decl) == TYPE_DECL | |
1474 | && (B_IN_CURRENT_SCOPE (b) | |
1475 | || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b))) | |
1476 | && (TYPE_MAIN_VARIANT (TREE_TYPE (b->decl)) | |
1477 | != TYPE_MAIN_VARIANT (type))) | |
1478 | { | |
1479 | warning_at (loc, OPT_Wc___compat, | |
1480 | ("using %qD as both a typedef and a tag is " | |
1481 | "invalid in C++"), | |
1482 | b->decl); | |
1483 | if (b->locus != UNKNOWN_LOCATION) | |
1484 | inform (b->locus, "originally defined here"); | |
1485 | } | |
1486 | } | |
51ef3909 | 1487 | } |
1488 | \f | |
679bf177 | 1489 | /* Subroutine of compare_decls. Allow harmless mismatches in return |
c4dc8be9 | 1490 | and argument types provided that the type modes match. This function |
1491 | return a unified type given a suitable match, and 0 otherwise. */ | |
1492 | ||
1493 | static tree | |
679bf177 | 1494 | match_builtin_function_types (tree newtype, tree oldtype) |
c4dc8be9 | 1495 | { |
1496 | tree newrettype, oldrettype; | |
1497 | tree newargs, oldargs; | |
1498 | tree trytype, tryargs; | |
1499 | ||
1500 | /* Accept the return type of the new declaration if same modes. */ | |
1501 | oldrettype = TREE_TYPE (oldtype); | |
1502 | newrettype = TREE_TYPE (newtype); | |
1503 | ||
1504 | if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype)) | |
1505 | return 0; | |
1506 | ||
1507 | oldargs = TYPE_ARG_TYPES (oldtype); | |
1508 | newargs = TYPE_ARG_TYPES (newtype); | |
1509 | tryargs = newargs; | |
1510 | ||
1511 | while (oldargs || newargs) | |
1512 | { | |
84166705 | 1513 | if (!oldargs |
1514 | || !newargs | |
1515 | || !TREE_VALUE (oldargs) | |
1516 | || !TREE_VALUE (newargs) | |
c4dc8be9 | 1517 | || TYPE_MODE (TREE_VALUE (oldargs)) |
1518 | != TYPE_MODE (TREE_VALUE (newargs))) | |
1519 | return 0; | |
1520 | ||
1521 | oldargs = TREE_CHAIN (oldargs); | |
1522 | newargs = TREE_CHAIN (newargs); | |
1523 | } | |
1524 | ||
1525 | trytype = build_function_type (newrettype, tryargs); | |
1526 | return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype)); | |
1527 | } | |
1528 | ||
4885b286 | 1529 | /* Subroutine of diagnose_mismatched_decls. Check for function type |
679bf177 | 1530 | mismatch involving an empty arglist vs a nonempty one and give clearer |
7c2df241 | 1531 | diagnostics. */ |
679bf177 | 1532 | static void |
1533 | diagnose_arglist_conflict (tree newdecl, tree olddecl, | |
1534 | tree newtype, tree oldtype) | |
1535 | { | |
1536 | tree t; | |
51ef3909 | 1537 | |
679bf177 | 1538 | if (TREE_CODE (olddecl) != FUNCTION_DECL |
3ed275a6 | 1539 | || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype)) |
a36cf284 | 1540 | || !((!prototype_p (oldtype) && DECL_INITIAL (olddecl) == 0) |
1541 | || (!prototype_p (newtype) && DECL_INITIAL (newdecl) == 0))) | |
679bf177 | 1542 | return; |
b33f0698 | 1543 | |
679bf177 | 1544 | t = TYPE_ARG_TYPES (oldtype); |
1545 | if (t == 0) | |
1546 | t = TYPE_ARG_TYPES (newtype); | |
1547 | for (; t; t = TREE_CHAIN (t)) | |
1548 | { | |
1549 | tree type = TREE_VALUE (t); | |
51ef3909 | 1550 | |
679bf177 | 1551 | if (TREE_CHAIN (t) == 0 |
1552 | && TYPE_MAIN_VARIANT (type) != void_type_node) | |
1553 | { | |
5bcc316e | 1554 | inform (input_location, "a parameter list with an ellipsis can%'t match " |
679bf177 | 1555 | "an empty parameter name list declaration"); |
1556 | break; | |
1557 | } | |
1558 | ||
1559 | if (c_type_promotes_to (type) != type) | |
1560 | { | |
5bcc316e | 1561 | inform (input_location, "an argument type that has a default promotion can%'t match " |
679bf177 | 1562 | "an empty parameter name list declaration"); |
1563 | break; | |
1564 | } | |
1565 | } | |
1566 | } | |
51ef3909 | 1567 | |
679bf177 | 1568 | /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an |
1569 | old-style function definition, NEWDECL is a prototype declaration. | |
1570 | Diagnose inconsistencies in the argument list. Returns TRUE if | |
1571 | the prototype is compatible, FALSE if not. */ | |
1572 | static bool | |
1573 | validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype) | |
1574 | { | |
2a222da1 | 1575 | tree newargs, oldargs; |
1576 | int i; | |
1577 | ||
97ca039c | 1578 | #define END_OF_ARGLIST(t) ((t) == void_type_node) |
2a222da1 | 1579 | |
1580 | oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype); | |
1581 | newargs = TYPE_ARG_TYPES (newtype); | |
1582 | i = 1; | |
1583 | ||
1584 | for (;;) | |
93f10b04 | 1585 | { |
cd27e3ac | 1586 | tree oldargtype = TREE_VALUE (oldargs); |
1587 | tree newargtype = TREE_VALUE (newargs); | |
1588 | ||
1589 | if (oldargtype == error_mark_node || newargtype == error_mark_node) | |
1590 | return false; | |
1591 | ||
b560fabd | 1592 | oldargtype = (TYPE_ATOMIC (oldargtype) |
1593 | ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype), | |
1594 | TYPE_QUAL_ATOMIC) | |
1595 | : TYPE_MAIN_VARIANT (oldargtype)); | |
1596 | newargtype = (TYPE_ATOMIC (newargtype) | |
1597 | ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype), | |
1598 | TYPE_QUAL_ATOMIC) | |
1599 | : TYPE_MAIN_VARIANT (newargtype)); | |
2a222da1 | 1600 | |
1601 | if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype)) | |
1602 | break; | |
1603 | ||
1604 | /* Reaching the end of just one list means the two decls don't | |
1605 | agree on the number of arguments. */ | |
1606 | if (END_OF_ARGLIST (oldargtype)) | |
93f10b04 | 1607 | { |
3cf8b391 | 1608 | error ("prototype for %q+D declares more arguments " |
1609 | "than previous old-style definition", newdecl); | |
2a222da1 | 1610 | return false; |
93f10b04 | 1611 | } |
2a222da1 | 1612 | else if (END_OF_ARGLIST (newargtype)) |
679bf177 | 1613 | { |
3cf8b391 | 1614 | error ("prototype for %q+D declares fewer arguments " |
1615 | "than previous old-style definition", newdecl); | |
679bf177 | 1616 | return false; |
1617 | } | |
2a222da1 | 1618 | |
1619 | /* Type for passing arg must be consistent with that declared | |
1620 | for the arg. */ | |
84166705 | 1621 | else if (!comptypes (oldargtype, newargtype)) |
679bf177 | 1622 | { |
3cf8b391 | 1623 | error ("prototype for %q+D declares argument %d" |
07e3a3d2 | 1624 | " with incompatible type", |
3cf8b391 | 1625 | newdecl, i); |
679bf177 | 1626 | return false; |
1627 | } | |
2a222da1 | 1628 | |
1629 | oldargs = TREE_CHAIN (oldargs); | |
1630 | newargs = TREE_CHAIN (newargs); | |
1631 | i++; | |
93f10b04 | 1632 | } |
2a222da1 | 1633 | |
1634 | /* If we get here, no errors were found, but do issue a warning | |
1635 | for this poor-style construct. */ | |
3cf8b391 | 1636 | warning (0, "prototype for %q+D follows non-prototype definition", |
1637 | newdecl); | |
2a222da1 | 1638 | return true; |
1639 | #undef END_OF_ARGLIST | |
679bf177 | 1640 | } |
1f0395c4 | 1641 | |
679bf177 | 1642 | /* Subroutine of diagnose_mismatched_decls. Report the location of DECL, |
1643 | first in a pair of mismatched declarations, using the diagnostic | |
1644 | function DIAG. */ | |
1645 | static void | |
a52d5726 | 1646 | locate_old_decl (tree decl) |
679bf177 | 1647 | { |
8b023e7c | 1648 | if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl) |
1649 | && !C_DECL_DECLARED_BUILTIN (decl)) | |
679bf177 | 1650 | ; |
1651 | else if (DECL_INITIAL (decl)) | |
5bcc316e | 1652 | inform (input_location, "previous definition of %q+D was here", decl); |
679bf177 | 1653 | else if (C_DECL_IMPLICIT (decl)) |
5bcc316e | 1654 | inform (input_location, "previous implicit declaration of %q+D was here", decl); |
679bf177 | 1655 | else |
5bcc316e | 1656 | inform (input_location, "previous declaration of %q+D was here", decl); |
679bf177 | 1657 | } |
51ef3909 | 1658 | |
679bf177 | 1659 | /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL. |
1660 | Returns true if the caller should proceed to merge the two, false | |
1661 | if OLDDECL should simply be discarded. As a side effect, issues | |
1662 | all necessary diagnostics for invalid or poor-style combinations. | |
1663 | If it returns true, writes the types of NEWDECL and OLDDECL to | |
1664 | *NEWTYPEP and *OLDTYPEP - these may have been adjusted from | |
1665 | TREE_TYPE (NEWDECL, OLDDECL) respectively. */ | |
1666 | ||
1667 | static bool | |
1668 | diagnose_mismatched_decls (tree newdecl, tree olddecl, | |
1669 | tree *newtypep, tree *oldtypep) | |
1670 | { | |
1671 | tree newtype, oldtype; | |
1672 | bool pedwarned = false; | |
1673 | bool warned = false; | |
67be63e6 | 1674 | bool retval = true; |
679bf177 | 1675 | |
c195b9ad | 1676 | #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \ |
1677 | && DECL_EXTERNAL (DECL)) | |
1678 | ||
679bf177 | 1679 | /* If we have error_mark_node for either decl or type, just discard |
1680 | the previous decl - we're in an error cascade already. */ | |
1681 | if (olddecl == error_mark_node || newdecl == error_mark_node) | |
1682 | return false; | |
2a222da1 | 1683 | *oldtypep = oldtype = TREE_TYPE (olddecl); |
1684 | *newtypep = newtype = TREE_TYPE (newdecl); | |
679bf177 | 1685 | if (oldtype == error_mark_node || newtype == error_mark_node) |
1686 | return false; | |
1687 | ||
1688 | /* Two different categories of symbol altogether. This is an error | |
1689 | unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */ | |
51ef3909 | 1690 | if (TREE_CODE (olddecl) != TREE_CODE (newdecl)) |
1691 | { | |
393b349a | 1692 | if (!(TREE_CODE (olddecl) == FUNCTION_DECL |
1693 | && DECL_BUILT_IN (olddecl) | |
1694 | && !C_DECL_DECLARED_BUILTIN (olddecl))) | |
51ef3909 | 1695 | { |
3cf8b391 | 1696 | error ("%q+D redeclared as different kind of symbol", newdecl); |
a52d5726 | 1697 | locate_old_decl (olddecl); |
679bf177 | 1698 | } |
1699 | else if (TREE_PUBLIC (newdecl)) | |
3cf8b391 | 1700 | warning (0, "built-in function %q+D declared as non-function", |
1701 | newdecl); | |
8b6866af | 1702 | else |
3cf8b391 | 1703 | warning (OPT_Wshadow, "declaration of %q+D shadows " |
1704 | "a built-in function", newdecl); | |
679bf177 | 1705 | return false; |
1706 | } | |
1707 | ||
5dad28f1 | 1708 | /* Enumerators have no linkage, so may only be declared once in a |
1709 | given scope. */ | |
1710 | if (TREE_CODE (olddecl) == CONST_DECL) | |
1711 | { | |
3cf8b391 | 1712 | error ("redeclaration of enumerator %q+D", newdecl); |
a52d5726 | 1713 | locate_old_decl (olddecl); |
5dad28f1 | 1714 | return false; |
1715 | } | |
1716 | ||
3ed275a6 | 1717 | if (!comptypes (oldtype, newtype)) |
679bf177 | 1718 | { |
a3ad3e27 | 1719 | if (TREE_CODE (olddecl) == FUNCTION_DECL |
393b349a | 1720 | && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl)) |
679bf177 | 1721 | { |
1722 | /* Accept harmless mismatch in function types. | |
1723 | This is for the ffs and fprintf builtins. */ | |
1724 | tree trytype = match_builtin_function_types (newtype, oldtype); | |
1725 | ||
3ed275a6 | 1726 | if (trytype && comptypes (newtype, trytype)) |
2a222da1 | 1727 | *oldtypep = oldtype = trytype; |
679bf177 | 1728 | else |
51ef3909 | 1729 | { |
679bf177 | 1730 | /* If types don't match for a built-in, throw away the |
1731 | built-in. No point in calling locate_old_decl here, it | |
7c2df241 | 1732 | won't print anything. */ |
3cf8b391 | 1733 | warning (0, "conflicting types for built-in function %q+D", |
1734 | newdecl); | |
679bf177 | 1735 | return false; |
51ef3909 | 1736 | } |
679bf177 | 1737 | } |
1738 | else if (TREE_CODE (olddecl) == FUNCTION_DECL | |
9a6486a6 | 1739 | && DECL_IS_BUILTIN (olddecl)) |
679bf177 | 1740 | { |
1741 | /* A conflicting function declaration for a predeclared | |
1742 | function that isn't actually built in. Objective C uses | |
1743 | these. The new declaration silently overrides everything | |
1744 | but the volatility (i.e. noreturn) indication. See also | |
1745 | below. FIXME: Make Objective C use normal builtins. */ | |
1746 | TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl); | |
1747 | return false; | |
1748 | } | |
1749 | /* Permit void foo (...) to match int foo (...) if the latter is | |
1750 | the definition and implicit int was used. See | |
1751 | c-torture/compile/920625-2.c. */ | |
1752 | else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) | |
1753 | && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node | |
1754 | && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node | |
a49e09d9 | 1755 | && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl)) |
679bf177 | 1756 | { |
21ca8540 | 1757 | pedwarned = pedwarn (input_location, 0, |
1758 | "conflicting types for %q+D", newdecl); | |
679bf177 | 1759 | /* Make sure we keep void as the return type. */ |
2a222da1 | 1760 | TREE_TYPE (newdecl) = *newtypep = newtype = oldtype; |
679bf177 | 1761 | C_FUNCTION_IMPLICIT_INT (newdecl) = 0; |
51ef3909 | 1762 | } |
a49e09d9 | 1763 | /* Permit void foo (...) to match an earlier call to foo (...) with |
1764 | no declared type (thus, implicitly int). */ | |
1765 | else if (TREE_CODE (newdecl) == FUNCTION_DECL | |
1766 | && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node | |
1767 | && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node | |
1768 | && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl)) | |
1769 | { | |
21ca8540 | 1770 | pedwarned = pedwarn (input_location, 0, |
1771 | "conflicting types for %q+D", newdecl); | |
a49e09d9 | 1772 | /* Make sure we keep void as the return type. */ |
1773 | TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype; | |
a49e09d9 | 1774 | } |
51ef3909 | 1775 | else |
1776 | { | |
6d5d708e | 1777 | int new_quals = TYPE_QUALS (newtype); |
1778 | int old_quals = TYPE_QUALS (oldtype); | |
1779 | ||
1780 | if (new_quals != old_quals) | |
1781 | { | |
1782 | addr_space_t new_addr = DECODE_QUAL_ADDR_SPACE (new_quals); | |
1783 | addr_space_t old_addr = DECODE_QUAL_ADDR_SPACE (old_quals); | |
1784 | if (new_addr != old_addr) | |
1785 | { | |
1786 | if (ADDR_SPACE_GENERIC_P (new_addr)) | |
1787 | error ("conflicting named address spaces (generic vs %s) " | |
1788 | "for %q+D", | |
1789 | c_addr_space_name (old_addr), newdecl); | |
1790 | else if (ADDR_SPACE_GENERIC_P (old_addr)) | |
1791 | error ("conflicting named address spaces (%s vs generic) " | |
1792 | "for %q+D", | |
1793 | c_addr_space_name (new_addr), newdecl); | |
1794 | else | |
1795 | error ("conflicting named address spaces (%s vs %s) " | |
1796 | "for %q+D", | |
1797 | c_addr_space_name (new_addr), | |
1798 | c_addr_space_name (old_addr), | |
1799 | newdecl); | |
1800 | } | |
1801 | ||
1802 | if (CLEAR_QUAL_ADDR_SPACE (new_quals) | |
1803 | != CLEAR_QUAL_ADDR_SPACE (old_quals)) | |
1804 | error ("conflicting type qualifiers for %q+D", newdecl); | |
1805 | } | |
14338e9a | 1806 | else |
3cf8b391 | 1807 | error ("conflicting types for %q+D", newdecl); |
679bf177 | 1808 | diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype); |
a52d5726 | 1809 | locate_old_decl (olddecl); |
679bf177 | 1810 | return false; |
51ef3909 | 1811 | } |
51ef3909 | 1812 | } |
1813 | ||
679bf177 | 1814 | /* Redeclaration of a type is a constraint violation (6.7.2.3p1), |
1815 | but silently ignore the redeclaration if either is in a system | |
ce3765bf | 1816 | header. (Conflicting redeclarations were handled above.) This |
32074525 | 1817 | is allowed for C11 if the types are the same, not just |
ce3765bf | 1818 | compatible. */ |
679bf177 | 1819 | if (TREE_CODE (newdecl) == TYPE_DECL) |
31ddae9f | 1820 | { |
ce3765bf | 1821 | bool types_different = false; |
1822 | int comptypes_result; | |
1823 | ||
1824 | comptypes_result | |
1825 | = comptypes_check_different_types (oldtype, newtype, &types_different); | |
1826 | ||
1827 | if (comptypes_result != 1 || types_different) | |
1828 | { | |
1829 | error ("redefinition of typedef %q+D with different type", newdecl); | |
1830 | locate_old_decl (olddecl); | |
1831 | return false; | |
1832 | } | |
1833 | ||
7cb6f926 | 1834 | if (DECL_IN_SYSTEM_HEADER (newdecl) |
1835 | || DECL_IN_SYSTEM_HEADER (olddecl) | |
1836 | || TREE_NO_WARNING (newdecl) | |
1837 | || TREE_NO_WARNING (olddecl)) | |
aab2cf92 | 1838 | return true; /* Allow OLDDECL to continue in use. */ |
14338e9a | 1839 | |
ff889d78 | 1840 | if (variably_modified_type_p (newtype, NULL)) |
ce3765bf | 1841 | { |
ff889d78 | 1842 | error ("redefinition of typedef %q+D with variably modified type", |
1843 | newdecl); | |
ce3765bf | 1844 | locate_old_decl (olddecl); |
1845 | } | |
32074525 | 1846 | else if (pedantic && !flag_isoc11) |
ce3765bf | 1847 | { |
29438999 | 1848 | pedwarn (input_location, OPT_Wpedantic, |
ff889d78 | 1849 | "redefinition of typedef %q+D", newdecl); |
ce3765bf | 1850 | locate_old_decl (olddecl); |
1851 | } | |
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))) | |
51ef3909 | 2102 | { |
48e1416a | 2103 | warned |= warning (OPT_Wattributes, |
a52d5726 | 2104 | "inline declaration of %qD follows " |
2105 | "declaration with attribute noinline", newdecl); | |
51ef3909 | 2106 | } |
679bf177 | 2107 | else if (DECL_DECLARED_INLINE_P (olddecl) |
2108 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl))) | |
1f0395c4 | 2109 | { |
48e1416a | 2110 | warned |= warning (OPT_Wattributes, |
a52d5726 | 2111 | "declaration of %q+D with attribute " |
2112 | "noinline follows inline declaration ", newdecl); | |
1f0395c4 | 2113 | } |
679bf177 | 2114 | } |
93d30214 | 2115 | else /* PARM_DECL, VAR_DECL */ |
679bf177 | 2116 | { |
393b349a | 2117 | /* Redeclaration of a parameter is a constraint violation (this is |
2118 | not explicitly stated, but follows from C99 6.7p3 [no more than | |
2119 | one declaration of the same identifier with no linkage in the | |
2120 | same scope, except type tags] and 6.2.2p6 [parameters have no | |
2121 | linkage]). We must check for a forward parameter declaration, | |
2122 | indicated by TREE_ASM_WRITTEN on the old declaration - this is | |
2123 | an extension, the mandatory diagnostic for which is handled by | |
2124 | mark_forward_parm_decls. */ | |
2125 | ||
93d30214 | 2126 | if (TREE_CODE (newdecl) == PARM_DECL |
2127 | && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl))) | |
2128 | { | |
3cf8b391 | 2129 | error ("redefinition of parameter %q+D", newdecl); |
a52d5726 | 2130 | locate_old_decl (olddecl); |
93d30214 | 2131 | return false; |
2132 | } | |
51ef3909 | 2133 | } |
2134 | ||
679bf177 | 2135 | /* Optional warning for completely redundant decls. */ |
2136 | if (!warned && !pedwarned | |
2137 | && warn_redundant_decls | |
2138 | /* Don't warn about a function declaration followed by a | |
2139 | definition. */ | |
93d30214 | 2140 | && !(TREE_CODE (newdecl) == FUNCTION_DECL |
2141 | && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)) | |
fbf0afd1 | 2142 | /* Don't warn about redundant redeclarations of builtins. */ |
18eb56cd | 2143 | && !(TREE_CODE (newdecl) == FUNCTION_DECL |
2144 | && !DECL_BUILT_IN (newdecl) | |
2145 | && DECL_BUILT_IN (olddecl) | |
2146 | && !C_DECL_DECLARED_BUILTIN (olddecl)) | |
93d30214 | 2147 | /* Don't warn about an extern followed by a definition. */ |
2148 | && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl)) | |
2149 | /* Don't warn about forward parameter decls. */ | |
2150 | && !(TREE_CODE (newdecl) == PARM_DECL | |
f5963a54 | 2151 | && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)) |
2152 | /* Don't warn about a variable definition following a declaration. */ | |
2153 | && !(TREE_CODE (newdecl) == VAR_DECL | |
2154 | && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))) | |
ca9d77da | 2155 | { |
a52d5726 | 2156 | warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D", |
2157 | newdecl); | |
ca9d77da | 2158 | } |
2159 | ||
a52d5726 | 2160 | /* Report location of previous decl/defn. */ |
679bf177 | 2161 | if (warned || pedwarned) |
a52d5726 | 2162 | locate_old_decl (olddecl); |
68547c04 | 2163 | |
c195b9ad | 2164 | #undef DECL_EXTERN_INLINE |
2165 | ||
67be63e6 | 2166 | return retval; |
679bf177 | 2167 | } |
51ef3909 | 2168 | |
679bf177 | 2169 | /* Subroutine of duplicate_decls. NEWDECL has been found to be |
2170 | consistent with OLDDECL, but carries new information. Merge the | |
b41346d4 | 2171 | new information into OLDDECL. This function issues no |
679bf177 | 2172 | diagnostics. */ |
2173 | ||
2174 | static void | |
b41346d4 | 2175 | merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype) |
679bf177 | 2176 | { |
c42cc79e | 2177 | bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL |
2178 | && DECL_INITIAL (newdecl) != 0); | |
2179 | bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL | |
a36cf284 | 2180 | && prototype_p (TREE_TYPE (newdecl))); |
c42cc79e | 2181 | bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL |
a36cf284 | 2182 | && prototype_p (TREE_TYPE (olddecl))); |
679bf177 | 2183 | |
393b349a | 2184 | /* For real parm decl following a forward decl, rechain the old decl |
2185 | in its new location and clear TREE_ASM_WRITTEN (it's not a | |
2186 | forward decl anymore). */ | |
679bf177 | 2187 | if (TREE_CODE (newdecl) == PARM_DECL |
84166705 | 2188 | && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)) |
51ef3909 | 2189 | { |
393b349a | 2190 | struct c_binding *b, **here; |
2191 | ||
2192 | for (here = ¤t_scope->bindings; *here; here = &(*here)->prev) | |
2193 | if ((*here)->decl == olddecl) | |
2194 | goto found; | |
231bd014 | 2195 | gcc_unreachable (); |
393b349a | 2196 | |
2197 | found: | |
2198 | b = *here; | |
2199 | *here = b->prev; | |
2200 | b->prev = current_scope->bindings; | |
2201 | current_scope->bindings = b; | |
2202 | ||
679bf177 | 2203 | TREE_ASM_WRITTEN (olddecl) = 0; |
679bf177 | 2204 | } |
2205 | ||
2206 | DECL_ATTRIBUTES (newdecl) | |
883b2e73 | 2207 | = targetm.merge_decl_attributes (olddecl, newdecl); |
b33f0698 | 2208 | |
679bf177 | 2209 | /* Merge the data types specified in the two decls. */ |
b41346d4 | 2210 | TREE_TYPE (newdecl) |
2211 | = TREE_TYPE (olddecl) | |
1ea7fa60 | 2212 | = composite_type (newtype, oldtype); |
51ef3909 | 2213 | |
679bf177 | 2214 | /* Lay the type out, unless already done. */ |
dd078265 | 2215 | if (!comptypes (oldtype, TREE_TYPE (newdecl))) |
679bf177 | 2216 | { |
2217 | if (TREE_TYPE (newdecl) != error_mark_node) | |
2218 | layout_type (TREE_TYPE (newdecl)); | |
2219 | if (TREE_CODE (newdecl) != FUNCTION_DECL | |
2220 | && TREE_CODE (newdecl) != TYPE_DECL | |
2221 | && TREE_CODE (newdecl) != CONST_DECL) | |
2222 | layout_decl (newdecl, 0); | |
2223 | } | |
2224 | else | |
2225 | { | |
2226 | /* Since the type is OLDDECL's, make OLDDECL's size go with. */ | |
2227 | DECL_SIZE (newdecl) = DECL_SIZE (olddecl); | |
2228 | DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl); | |
2229 | DECL_MODE (newdecl) = DECL_MODE (olddecl); | |
097b5c8b | 2230 | if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl)) |
2231 | { | |
2232 | DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl); | |
5f398d1f | 2233 | DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl); |
097b5c8b | 2234 | } |
679bf177 | 2235 | } |
2af4bc7b | 2236 | |
54d7a10c | 2237 | /* Keep the old rtl since we can safely use it. */ |
2238 | if (HAS_RTL_P (olddecl)) | |
2239 | COPY_DECL_RTL (olddecl, newdecl); | |
b8e0d419 | 2240 | |
679bf177 | 2241 | /* Merge the type qualifiers. */ |
2242 | if (TREE_READONLY (newdecl)) | |
b41346d4 | 2243 | TREE_READONLY (olddecl) = 1; |
50333348 | 2244 | |
679bf177 | 2245 | if (TREE_THIS_VOLATILE (newdecl)) |
ebef29eb | 2246 | TREE_THIS_VOLATILE (olddecl) = 1; |
679bf177 | 2247 | |
df4d0ece | 2248 | /* Merge deprecatedness. */ |
2249 | if (TREE_DEPRECATED (newdecl)) | |
2250 | TREE_DEPRECATED (olddecl) = 1; | |
2251 | ||
6a1a89a6 | 2252 | /* If a decl is in a system header and the other isn't, keep the one on the |
2253 | system header. Otherwise, keep source location of definition rather than | |
2254 | declaration and of prototype rather than non-prototype unless that | |
2255 | prototype is built-in. */ | |
2256 | if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS) | |
2257 | && DECL_IN_SYSTEM_HEADER (olddecl) | |
2258 | && !DECL_IN_SYSTEM_HEADER (newdecl) ) | |
bdbc474b | 2259 | DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl); |
6a1a89a6 | 2260 | else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS) |
2261 | && DECL_IN_SYSTEM_HEADER (newdecl) | |
2262 | && !DECL_IN_SYSTEM_HEADER (olddecl)) | |
bdbc474b | 2263 | DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl); |
6a1a89a6 | 2264 | else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0) |
2265 | || (old_is_prototype && !new_is_prototype | |
2266 | && !C_DECL_BUILTIN_PROTOTYPE (olddecl))) | |
679bf177 | 2267 | DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl); |
2268 | ||
679bf177 | 2269 | /* Merge the initialization information. */ |
b41346d4 | 2270 | if (DECL_INITIAL (newdecl) == 0) |
679bf177 | 2271 | DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl); |
2272 | ||
1e8e9920 | 2273 | /* Merge the threadprivate attribute. */ |
2274 | if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl)) | |
2275 | { | |
2276 | DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl); | |
2277 | C_DECL_THREADPRIVATE_P (newdecl) = 1; | |
2278 | } | |
2279 | ||
098b24b8 | 2280 | if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)) |
2281 | { | |
098b24b8 | 2282 | /* Merge the section attribute. |
2283 | We want to issue an error if the sections conflict but that | |
2284 | must be done later in decl_attributes since we are called | |
2285 | before attributes are assigned. */ | |
2286 | if (DECL_SECTION_NAME (newdecl) == NULL_TREE) | |
2287 | DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl); | |
2288 | ||
2289 | /* Copy the assembler name. | |
2290 | Currently, it can only be defined in the prototype. */ | |
2291 | COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl); | |
2292 | ||
2293 | /* Use visibility of whichever declaration had it specified */ | |
2294 | if (DECL_VISIBILITY_SPECIFIED (olddecl)) | |
2295 | { | |
2296 | DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl); | |
2297 | DECL_VISIBILITY_SPECIFIED (newdecl) = 1; | |
2298 | } | |
2299 | ||
2300 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2301 | { | |
2302 | DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl); | |
2303 | DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl); | |
2304 | DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl); | |
2305 | DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl) | |
2306 | |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl); | |
2307 | TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl); | |
098b24b8 | 2308 | DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl); |
68d6de5b | 2309 | DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl); |
9c2a0c05 | 2310 | TREE_READONLY (newdecl) |= TREE_READONLY (olddecl); |
2311 | DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl); | |
098b24b8 | 2312 | DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl); |
2313 | } | |
2314 | ||
2315 | /* Merge the storage class information. */ | |
2316 | merge_weak (newdecl, olddecl); | |
2317 | ||
2318 | /* For functions, static overrides non-static. */ | |
2319 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2320 | { | |
2321 | TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl); | |
2322 | /* This is since we don't automatically | |
2323 | copy the attributes of NEWDECL into OLDDECL. */ | |
2324 | TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl); | |
2325 | /* If this clears `static', clear it in the identifier too. */ | |
2326 | if (!TREE_PUBLIC (olddecl)) | |
2327 | TREE_PUBLIC (DECL_NAME (olddecl)) = 0; | |
2328 | } | |
2329 | } | |
2330 | ||
541e4101 | 2331 | /* In c99, 'extern' declaration before (or after) 'inline' means this |
2332 | function is not DECL_EXTERNAL, unless 'gnu_inline' attribute | |
2333 | is present. */ | |
2334 | if (TREE_CODE (newdecl) == FUNCTION_DECL | |
11950bdd | 2335 | && !flag_gnu89_inline |
541e4101 | 2336 | && (DECL_DECLARED_INLINE_P (newdecl) |
2337 | || DECL_DECLARED_INLINE_P (olddecl)) | |
2338 | && (!DECL_DECLARED_INLINE_P (newdecl) | |
2339 | || !DECL_DECLARED_INLINE_P (olddecl) | |
2340 | || !DECL_EXTERNAL (olddecl)) | |
2341 | && DECL_EXTERNAL (newdecl) | |
56f06eef | 2342 | && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl)) |
4d6b6a7f | 2343 | && !current_function_decl) |
541e4101 | 2344 | DECL_EXTERNAL (newdecl) = 0; |
c42cc79e | 2345 | |
098b24b8 | 2346 | if (DECL_EXTERNAL (newdecl)) |
2347 | { | |
2348 | TREE_STATIC (newdecl) = TREE_STATIC (olddecl); | |
2349 | DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl); | |
2350 | ||
2351 | /* An extern decl does not override previous storage class. */ | |
2352 | TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl); | |
2353 | if (!DECL_EXTERNAL (newdecl)) | |
2354 | { | |
2355 | DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl); | |
2356 | DECL_COMMON (newdecl) = DECL_COMMON (olddecl); | |
2357 | } | |
2358 | } | |
2359 | else | |
2360 | { | |
2361 | TREE_STATIC (olddecl) = TREE_STATIC (newdecl); | |
2362 | TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl); | |
2363 | } | |
2364 | ||
2365 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2366 | { | |
2367 | /* If we're redefining a function previously defined as extern | |
2368 | inline, make sure we emit debug info for the inline before we | |
2369 | throw it away, in case it was inlined into a function that | |
2370 | hasn't been written out yet. */ | |
2371 | if (new_is_definition && DECL_INITIAL (olddecl)) | |
bef7f001 | 2372 | /* The new defn must not be inline. */ |
2373 | DECL_UNINLINABLE (newdecl) = 1; | |
098b24b8 | 2374 | else |
2375 | { | |
2376 | /* If either decl says `inline', this fn is inline, unless | |
2377 | its definition was passed already. */ | |
2378 | if (DECL_DECLARED_INLINE_P (newdecl) | |
2379 | || DECL_DECLARED_INLINE_P (olddecl)) | |
2380 | DECL_DECLARED_INLINE_P (newdecl) = 1; | |
2381 | ||
2382 | DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl) | |
2383 | = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)); | |
ebb7d626 | 2384 | |
2385 | DECL_DISREGARD_INLINE_LIMITS (newdecl) | |
2386 | = DECL_DISREGARD_INLINE_LIMITS (olddecl) | |
2387 | = (DECL_DISREGARD_INLINE_LIMITS (newdecl) | |
2388 | || DECL_DISREGARD_INLINE_LIMITS (olddecl)); | |
098b24b8 | 2389 | } |
2390 | ||
2391 | if (DECL_BUILT_IN (olddecl)) | |
2392 | { | |
2393 | /* If redeclaring a builtin function, it stays built in. | |
2394 | But it gets tagged as having been declared. */ | |
2395 | DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl); | |
2396 | DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl); | |
2397 | C_DECL_DECLARED_BUILTIN (newdecl) = 1; | |
2398 | if (new_is_prototype) | |
9efe50a4 | 2399 | { |
2400 | C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0; | |
2401 | if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL) | |
b9a16870 | 2402 | { |
2403 | enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl); | |
2404 | switch (fncode) | |
2405 | { | |
2406 | /* If a compatible prototype of these builtin functions | |
2407 | is seen, assume the runtime implements it with the | |
2408 | expected semantics. */ | |
2409 | case BUILT_IN_STPCPY: | |
2410 | if (builtin_decl_explicit_p (fncode)) | |
2411 | set_builtin_decl_implicit_p (fncode, true); | |
2412 | break; | |
2413 | default: | |
2414 | break; | |
2415 | } | |
2416 | } | |
9efe50a4 | 2417 | } |
098b24b8 | 2418 | else |
2419 | C_DECL_BUILTIN_PROTOTYPE (newdecl) | |
2420 | = C_DECL_BUILTIN_PROTOTYPE (olddecl); | |
2421 | } | |
2422 | ||
46f8e3b0 | 2423 | /* Preserve function specific target and optimization options */ |
2424 | if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl) | |
2425 | && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl)) | |
2426 | DECL_FUNCTION_SPECIFIC_TARGET (newdecl) | |
2427 | = DECL_FUNCTION_SPECIFIC_TARGET (olddecl); | |
2428 | ||
2429 | if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl) | |
2430 | && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)) | |
2431 | DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl) | |
2432 | = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl); | |
2433 | ||
098b24b8 | 2434 | /* Also preserve various other info from the definition. */ |
2435 | if (!new_is_definition) | |
2436 | { | |
14bd221c | 2437 | tree t; |
098b24b8 | 2438 | DECL_RESULT (newdecl) = DECL_RESULT (olddecl); |
2439 | DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl); | |
2440 | DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl); | |
2441 | DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl); | |
14bd221c | 2442 | DECL_ARGUMENTS (newdecl) = copy_list (DECL_ARGUMENTS (olddecl)); |
1767a056 | 2443 | for (t = DECL_ARGUMENTS (newdecl); t ; t = DECL_CHAIN (t)) |
14bd221c | 2444 | DECL_CONTEXT (t) = newdecl; |
098b24b8 | 2445 | |
81549c4d | 2446 | /* See if we've got a function to instantiate from. */ |
2447 | if (DECL_SAVED_TREE (olddecl)) | |
2448 | DECL_ABSTRACT_ORIGIN (newdecl) | |
2449 | = DECL_ABSTRACT_ORIGIN (olddecl); | |
098b24b8 | 2450 | } |
2451 | } | |
2452 | ||
da870dac | 2453 | /* Merge the USED information. */ |
2454 | if (TREE_USED (olddecl)) | |
2455 | TREE_USED (newdecl) = 1; | |
2456 | else if (TREE_USED (newdecl)) | |
2457 | TREE_USED (olddecl) = 1; | |
abc6c64f | 2458 | if (TREE_CODE (olddecl) == VAR_DECL || TREE_CODE (olddecl) == PARM_DECL) |
2459 | DECL_READ_P (newdecl) |= DECL_READ_P (olddecl); | |
5b5632f7 | 2460 | if (DECL_PRESERVE_P (olddecl)) |
2461 | DECL_PRESERVE_P (newdecl) = 1; | |
2462 | else if (DECL_PRESERVE_P (newdecl)) | |
2463 | DECL_PRESERVE_P (olddecl) = 1; | |
f901d289 | 2464 | |
098b24b8 | 2465 | /* Copy most of the decl-specific fields of NEWDECL into OLDDECL. |
58d82cd0 | 2466 | But preserve OLDDECL's DECL_UID, DECL_CONTEXT and |
2467 | DECL_ARGUMENTS (if appropriate). */ | |
41a7cb9f | 2468 | { |
19cb6b50 | 2469 | unsigned olddecl_uid = DECL_UID (olddecl); |
b3e83e1e | 2470 | tree olddecl_context = DECL_CONTEXT (olddecl); |
14bd221c | 2471 | tree olddecl_arguments = NULL; |
2472 | if (TREE_CODE (olddecl) == FUNCTION_DECL) | |
2473 | olddecl_arguments = DECL_ARGUMENTS (olddecl); | |
a0c938f0 | 2474 | |
d5130039 | 2475 | memcpy ((char *) olddecl + sizeof (struct tree_common), |
2476 | (char *) newdecl + sizeof (struct tree_common), | |
5ded8c6f | 2477 | sizeof (struct tree_decl_common) - sizeof (struct tree_common)); |
fc0d4990 | 2478 | DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl); |
5ded8c6f | 2479 | switch (TREE_CODE (olddecl)) |
2480 | { | |
75a70cf9 | 2481 | case FUNCTION_DECL: |
5ded8c6f | 2482 | case FIELD_DECL: |
2483 | case VAR_DECL: | |
2484 | case PARM_DECL: | |
2485 | case LABEL_DECL: | |
2486 | case RESULT_DECL: | |
2487 | case CONST_DECL: | |
2488 | case TYPE_DECL: | |
5ded8c6f | 2489 | memcpy ((char *) olddecl + sizeof (struct tree_decl_common), |
2490 | (char *) newdecl + sizeof (struct tree_decl_common), | |
2491 | tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common)); | |
2492 | break; | |
2493 | ||
2494 | default: | |
a0c938f0 | 2495 | |
5ded8c6f | 2496 | memcpy ((char *) olddecl + sizeof (struct tree_decl_common), |
2497 | (char *) newdecl + sizeof (struct tree_decl_common), | |
2498 | sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)); | |
2499 | } | |
41a7cb9f | 2500 | DECL_UID (olddecl) = olddecl_uid; |
b3e83e1e | 2501 | DECL_CONTEXT (olddecl) = olddecl_context; |
14bd221c | 2502 | if (TREE_CODE (olddecl) == FUNCTION_DECL) |
2503 | DECL_ARGUMENTS (olddecl) = olddecl_arguments; | |
41a7cb9f | 2504 | } |
51ef3909 | 2505 | |
979e2687 | 2506 | /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl |
2507 | so that encode_section_info has a chance to look at the new decl | |
2508 | flags and attributes. */ | |
2509 | if (DECL_RTL_SET_P (olddecl) | |
2510 | && (TREE_CODE (olddecl) == FUNCTION_DECL | |
2511 | || (TREE_CODE (olddecl) == VAR_DECL | |
2512 | && TREE_STATIC (olddecl)))) | |
b2c4af5e | 2513 | make_decl_rtl (olddecl); |
51ef3909 | 2514 | } |
2515 | ||
679bf177 | 2516 | /* Handle when a new declaration NEWDECL has the same name as an old |
2517 | one OLDDECL in the same binding contour. Prints an error message | |
2518 | if appropriate. | |
2519 | ||
2520 | If safely possible, alter OLDDECL to look like NEWDECL, and return | |
b41346d4 | 2521 | true. Otherwise, return false. */ |
679bf177 | 2522 | |
2523 | static bool | |
b41346d4 | 2524 | duplicate_decls (tree newdecl, tree olddecl) |
679bf177 | 2525 | { |
4ee9c684 | 2526 | tree newtype = NULL, oldtype = NULL; |
679bf177 | 2527 | |
2528 | if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype)) | |
8babbffa | 2529 | { |
b1a2195b | 2530 | /* Avoid `unused variable' and other warnings for OLDDECL. */ |
8babbffa | 2531 | TREE_NO_WARNING (olddecl) = 1; |
2532 | return false; | |
2533 | } | |
679bf177 | 2534 | |
b41346d4 | 2535 | merge_decls (newdecl, olddecl, newtype, oldtype); |
2536 | return true; | |
679bf177 | 2537 | } |
14338e9a | 2538 | |
679bf177 | 2539 | \f |
e85905e5 | 2540 | /* Check whether decl-node NEW_DECL shadows an existing declaration. */ |
31ddae9f | 2541 | static void |
e85905e5 | 2542 | warn_if_shadowing (tree new_decl) |
31ddae9f | 2543 | { |
393b349a | 2544 | struct c_binding *b; |
31ddae9f | 2545 | |
393b349a | 2546 | /* Shadow warnings wanted? */ |
2547 | if (!warn_shadow | |
31ddae9f | 2548 | /* No shadow warnings for internally generated vars. */ |
e85905e5 | 2549 | || DECL_IS_BUILTIN (new_decl) |
31ddae9f | 2550 | /* No shadow warnings for vars made for inlining. */ |
40c4b476 | 2551 | || DECL_FROM_INLINE (new_decl)) |
5f3cead1 | 2552 | return; |
2553 | ||
4194491a | 2554 | /* Is anything being shadowed? Invisible decls do not count. */ |
e85905e5 | 2555 | for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed) |
10a45226 | 2556 | if (b->decl && b->decl != new_decl && !b->invisible |
2557 | && (b->decl == error_mark_node | |
2558 | || diagnostic_report_warnings_p (global_dc, | |
2559 | DECL_SOURCE_LOCATION (b->decl)))) | |
393b349a | 2560 | { |
e85905e5 | 2561 | tree old_decl = b->decl; |
393b349a | 2562 | |
d75329f0 | 2563 | if (old_decl == error_mark_node) |
2564 | { | |
e8d0745d | 2565 | warning (OPT_Wshadow, "declaration of %q+D shadows previous " |
2566 | "non-variable", new_decl); | |
d75329f0 | 2567 | break; |
2568 | } | |
2569 | else if (TREE_CODE (old_decl) == PARM_DECL) | |
e8d0745d | 2570 | warning (OPT_Wshadow, "declaration of %q+D shadows a parameter", |
3cf8b391 | 2571 | new_decl); |
e8d0745d | 2572 | else if (DECL_FILE_SCOPE_P (old_decl)) |
08fc5390 | 2573 | { |
2574 | /* Do not warn if a variable shadows a function, unless | |
2575 | the variable is a function or a pointer-to-function. */ | |
2576 | if (TREE_CODE (old_decl) == FUNCTION_DECL | |
2577 | && TREE_CODE (new_decl) != FUNCTION_DECL | |
2578 | && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl))) | |
2579 | continue; | |
2580 | ||
2581 | warning_at (DECL_SOURCE_LOCATION (new_decl), OPT_Wshadow, | |
2582 | "declaration of %qD shadows a global declaration", | |
2583 | new_decl); | |
2584 | } | |
e85905e5 | 2585 | else if (TREE_CODE (old_decl) == FUNCTION_DECL |
2586 | && DECL_BUILT_IN (old_decl)) | |
d75329f0 | 2587 | { |
e8d0745d | 2588 | warning (OPT_Wshadow, "declaration of %q+D shadows " |
2589 | "a built-in function", new_decl); | |
d75329f0 | 2590 | break; |
2591 | } | |
393b349a | 2592 | else |
e8d0745d | 2593 | warning (OPT_Wshadow, "declaration of %q+D shadows a previous local", |
3cf8b391 | 2594 | new_decl); |
393b349a | 2595 | |
712d2297 | 2596 | warning_at (DECL_SOURCE_LOCATION (old_decl), OPT_Wshadow, |
2597 | "shadowed declaration is here"); | |
a3ad3e27 | 2598 | |
393b349a | 2599 | break; |
2600 | } | |
31ddae9f | 2601 | } |
2602 | ||
51ef3909 | 2603 | /* Record a decl-node X as belonging to the current lexical scope. |
2604 | Check for errors (such as an incompatible declaration for the same | |
2605 | name already seen in the same scope). | |
2606 | ||
2607 | Returns either X or an old decl for the same name. | |
2608 | If an old decl is returned, it may have been smashed | |
2609 | to agree with what X says. */ | |
2610 | ||
2611 | tree | |
1cae46be | 2612 | pushdecl (tree x) |
51ef3909 | 2613 | { |
19cb6b50 | 2614 | tree name = DECL_NAME (x); |
6e899616 | 2615 | struct c_scope *scope = current_scope; |
393b349a | 2616 | struct c_binding *b; |
4194491a | 2617 | bool nested = false; |
6fb80942 | 2618 | location_t locus = DECL_SOURCE_LOCATION (x); |
51ef3909 | 2619 | |
4d714d55 | 2620 | /* Must set DECL_CONTEXT for everything not at file scope or |
2621 | DECL_FILE_SCOPE_P won't work. Local externs don't count | |
2622 | unless they have initializers (which generate code). */ | |
2623 | if (current_function_decl | |
2624 | && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL) | |
2625 | || DECL_INITIAL (x) || !DECL_EXTERNAL (x))) | |
31ddae9f | 2626 | DECL_CONTEXT (x) = current_function_decl; |
d9cf68bf | 2627 | |
393b349a | 2628 | /* Anonymous decls are just inserted in the scope. */ |
2629 | if (!name) | |
51ef3909 | 2630 | { |
6fb80942 | 2631 | bind (name, x, scope, /*invisible=*/false, /*nested=*/false, |
2632 | locus); | |
393b349a | 2633 | return x; |
2634 | } | |
2635 | ||
2636 | /* First, see if there is another declaration with the same name in | |
2637 | the current scope. If there is, duplicate_decls may do all the | |
2638 | work for us. If duplicate_decls returns false, that indicates | |
2639 | two incompatible decls in the same scope; we are to silently | |
2640 | replace the old one (duplicate_decls has issued all appropriate | |
2641 | diagnostics). In particular, we should not consider possible | |
2642 | duplicates in the external scope, or shadowing. */ | |
2643 | b = I_SYMBOL_BINDING (name); | |
4194491a | 2644 | if (b && B_IN_SCOPE (b, scope)) |
393b349a | 2645 | { |
fea849d3 | 2646 | struct c_binding *b_ext, *b_use; |
2647 | tree type = TREE_TYPE (x); | |
2648 | tree visdecl = b->decl; | |
2649 | tree vistype = TREE_TYPE (visdecl); | |
606a02e3 | 2650 | if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE |
2651 | && COMPLETE_TYPE_P (TREE_TYPE (x))) | |
2652 | b->inner_comp = false; | |
fea849d3 | 2653 | b_use = b; |
2654 | b_ext = b; | |
2655 | /* If this is an external linkage declaration, we should check | |
2656 | for compatibility with the type in the external scope before | |
2657 | setting the type at this scope based on the visible | |
2658 | information only. */ | |
2659 | if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl)) | |
2660 | { | |
2661 | while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext)) | |
2662 | b_ext = b_ext->shadowed; | |
2663 | if (b_ext) | |
2664 | { | |
2665 | b_use = b_ext; | |
f805d53d | 2666 | if (b_use->u.type) |
2667 | TREE_TYPE (b_use->decl) = b_use->u.type; | |
fea849d3 | 2668 | } |
2669 | } | |
2670 | if (duplicate_decls (x, b_use->decl)) | |
2671 | { | |
2672 | if (b_use != b) | |
2673 | { | |
2674 | /* Save the updated type in the external scope and | |
2675 | restore the proper type for this scope. */ | |
2676 | tree thistype; | |
2677 | if (comptypes (vistype, type)) | |
2678 | thistype = composite_type (vistype, type); | |
2679 | else | |
2680 | thistype = TREE_TYPE (b_use->decl); | |
f805d53d | 2681 | b_use->u.type = TREE_TYPE (b_use->decl); |
fea849d3 | 2682 | if (TREE_CODE (b_use->decl) == FUNCTION_DECL |
2683 | && DECL_BUILT_IN (b_use->decl)) | |
2684 | thistype | |
2685 | = build_type_attribute_variant (thistype, | |
2686 | TYPE_ATTRIBUTES | |
f805d53d | 2687 | (b_use->u.type)); |
fea849d3 | 2688 | TREE_TYPE (b_use->decl) = thistype; |
2689 | } | |
2690 | return b_use->decl; | |
2691 | } | |
393b349a | 2692 | else |
2693 | goto skip_external_and_shadow_checks; | |
2694 | } | |
2695 | ||
2696 | /* All declarations with external linkage, and all external | |
2697 | references, go in the external scope, no matter what scope is | |
2698 | current. However, the binding in that scope is ignored for | |
2699 | purposes of normal name lookup. A separate binding structure is | |
2700 | created in the requested scope; this governs the normal | |
2701 | visibility of the symbol. | |
51ef3909 | 2702 | |
393b349a | 2703 | The binding in the externals scope is used exclusively for |
2704 | detecting duplicate declarations of the same object, no matter | |
2705 | what scope they are in; this is what we do here. (C99 6.2.7p2: | |
2706 | All declarations that refer to the same object or function shall | |
2707 | have compatible type; otherwise, the behavior is undefined.) */ | |
2708 | if (DECL_EXTERNAL (x) || scope == file_scope) | |
2709 | { | |
606a02e3 | 2710 | tree type = TREE_TYPE (x); |
2711 | tree vistype = 0; | |
2712 | tree visdecl = 0; | |
2713 | bool type_saved = false; | |
2714 | if (b && !B_IN_EXTERNAL_SCOPE (b) | |
2715 | && (TREE_CODE (b->decl) == FUNCTION_DECL | |
2716 | || TREE_CODE (b->decl) == VAR_DECL) | |
2717 | && DECL_FILE_SCOPE_P (b->decl)) | |
2718 | { | |
2719 | visdecl = b->decl; | |
2720 | vistype = TREE_TYPE (visdecl); | |
2721 | } | |
6bf97f82 | 2722 | if (scope != file_scope |
94cb93b3 | 2723 | && !DECL_IN_SYSTEM_HEADER (x)) |
6bf97f82 | 2724 | warning (OPT_Wnested_externs, "nested extern declaration of %qD", x); |
94cb93b3 | 2725 | |
4194491a | 2726 | while (b && !B_IN_EXTERNAL_SCOPE (b)) |
606a02e3 | 2727 | { |
2728 | /* If this decl might be modified, save its type. This is | |
2729 | done here rather than when the decl is first bound | |
2730 | because the type may change after first binding, through | |
2731 | being completed or through attributes being added. If we | |
2732 | encounter multiple such decls, only the first should have | |
2733 | its type saved; the others will already have had their | |
2734 | proper types saved and the types will not have changed as | |
2735 | their scopes will not have been re-entered. */ | |
d75329f0 | 2736 | if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved) |
606a02e3 | 2737 | { |
f805d53d | 2738 | b->u.type = TREE_TYPE (b->decl); |
606a02e3 | 2739 | type_saved = true; |
2740 | } | |
2741 | if (B_IN_FILE_SCOPE (b) | |
2742 | && TREE_CODE (b->decl) == VAR_DECL | |
2743 | && TREE_STATIC (b->decl) | |
2744 | && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE | |
2745 | && !TYPE_DOMAIN (TREE_TYPE (b->decl)) | |
2746 | && TREE_CODE (type) == ARRAY_TYPE | |
2747 | && TYPE_DOMAIN (type) | |
2748 | && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) | |
2749 | && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type)))) | |
2750 | { | |
2751 | /* Array type completed in inner scope, which should be | |
2752 | diagnosed if the completion does not have size 1 and | |
2753 | it does not get completed in the file scope. */ | |
2754 | b->inner_comp = true; | |
2755 | } | |
2756 | b = b->shadowed; | |
2757 | } | |
2758 | ||
2759 | /* If a matching external declaration has been found, set its | |
2760 | type to the composite of all the types of that declaration. | |
2761 | After the consistency checks, it will be reset to the | |
2762 | composite of the visible types only. */ | |
2763 | if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl)) | |
f805d53d | 2764 | && b->u.type) |
2765 | TREE_TYPE (b->decl) = b->u.type; | |
393b349a | 2766 | |
2767 | /* The point of the same_translation_unit_p check here is, | |
2768 | we want to detect a duplicate decl for a construct like | |
2769 | foo() { extern bar(); } ... static bar(); but not if | |
2770 | they are in different translation units. In any case, | |
2771 | the static does not go in the externals scope. */ | |
2772 | if (b | |
b3e83e1e | 2773 | && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl)) |
393b349a | 2774 | && duplicate_decls (x, b->decl)) |
f74be9a1 | 2775 | { |
606a02e3 | 2776 | tree thistype; |
fea849d3 | 2777 | if (vistype) |
2778 | { | |
2779 | if (comptypes (vistype, type)) | |
2780 | thistype = composite_type (vistype, type); | |
2781 | else | |
2782 | thistype = TREE_TYPE (b->decl); | |
2783 | } | |
2784 | else | |
2785 | thistype = type; | |
f805d53d | 2786 | b->u.type = TREE_TYPE (b->decl); |
606a02e3 | 2787 | if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl)) |
2788 | thistype | |
2789 | = build_type_attribute_variant (thistype, | |
f805d53d | 2790 | TYPE_ATTRIBUTES (b->u.type)); |
606a02e3 | 2791 | TREE_TYPE (b->decl) = thistype; |
6fb80942 | 2792 | bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true, |
2793 | locus); | |
393b349a | 2794 | return b->decl; |
f74be9a1 | 2795 | } |
b3e83e1e | 2796 | else if (TREE_PUBLIC (x)) |
4214af46 | 2797 | { |
606a02e3 | 2798 | if (visdecl && !b && duplicate_decls (x, visdecl)) |
2799 | { | |
2800 | /* An external declaration at block scope referring to a | |
2801 | visible entity with internal linkage. The composite | |
2802 | type will already be correct for this scope, so we | |
2803 | just need to fall through to make the declaration in | |
2804 | this scope. */ | |
2805 | nested = true; | |
2d7a881f | 2806 | x = visdecl; |
606a02e3 | 2807 | } |
2808 | else | |
2809 | { | |
2810 | bind (name, x, external_scope, /*invisible=*/true, | |
6fb80942 | 2811 | /*nested=*/false, locus); |
606a02e3 | 2812 | nested = true; |
2813 | } | |
51ef3909 | 2814 | } |
393b349a | 2815 | } |
1cae46be | 2816 | |
40c4b476 | 2817 | if (TREE_CODE (x) != PARM_DECL) |
2818 | warn_if_shadowing (x); | |
51ef3909 | 2819 | |
393b349a | 2820 | skip_external_and_shadow_checks: |
2821 | if (TREE_CODE (x) == TYPE_DECL) | |
a4e3ffad | 2822 | { |
2823 | /* So this is a typedef, set its underlying type. */ | |
2824 | set_underlying_type (x); | |
2825 | ||
2826 | /* If X is a typedef defined in the current function, record it | |
2827 | for the purpose of implementing the -Wunused-local-typedefs | |
2828 | warning. */ | |
2829 | record_locally_defined_typedef (x); | |
2830 | } | |
51ef3909 | 2831 | |
6fb80942 | 2832 | bind (name, x, scope, /*invisible=*/false, nested, locus); |
393b349a | 2833 | |
2834 | /* If x's type is incomplete because it's based on a | |
2835 | structure or union which has not yet been fully declared, | |
2836 | attach it to that structure or union type, so we can go | |
2837 | back and complete the variable declaration later, if the | |
2838 | structure or union gets fully declared. | |
51ef3909 | 2839 | |
393b349a | 2840 | If the input is erroneous, we can have error_mark in the type |
2841 | slot (e.g. "f(void a, ...)") - that doesn't count as an | |
2842 | incomplete type. */ | |
2843 | if (TREE_TYPE (x) != error_mark_node | |
2844 | && !COMPLETE_TYPE_P (TREE_TYPE (x))) | |
2845 | { | |
2846 | tree element = TREE_TYPE (x); | |
2847 | ||
2848 | while (TREE_CODE (element) == ARRAY_TYPE) | |
2849 | element = TREE_TYPE (element); | |
2850 | element = TYPE_MAIN_VARIANT (element); | |
2851 | ||
2852 | if ((TREE_CODE (element) == RECORD_TYPE | |
2853 | || TREE_CODE (element) == UNION_TYPE) | |
2854 | && (TREE_CODE (x) != TYPE_DECL | |
2855 | || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE) | |
2856 | && !COMPLETE_TYPE_P (element)) | |
2857 | C_TYPE_INCOMPLETE_VARS (element) | |
2858 | = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element)); | |
2859 | } | |
51ef3909 | 2860 | return x; |
2861 | } | |
2862 | ||
393b349a | 2863 | /* Record X as belonging to file scope. |
7ef5b942 | 2864 | This is used only internally by the Objective-C front end, |
3bdb6310 | 2865 | and is limited to its needs. duplicate_decls is not called; |
2866 | if there is any preexisting decl for this identifier, it is an ICE. */ | |
2867 | ||
31ddae9f | 2868 | tree |
1cae46be | 2869 | pushdecl_top_level (tree x) |
4124ea8b | 2870 | { |
3bdb6310 | 2871 | tree name; |
4194491a | 2872 | bool nested = false; |
6e030094 | 2873 | gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL); |
31ddae9f | 2874 | |
2875 | name = DECL_NAME (x); | |
31ddae9f | 2876 | |
6e030094 | 2877 | gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name)); |
4124ea8b | 2878 | |
b3e83e1e | 2879 | if (TREE_PUBLIC (x)) |
393b349a | 2880 | { |
6fb80942 | 2881 | bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false, |
2882 | UNKNOWN_LOCATION); | |
4194491a | 2883 | nested = true; |
393b349a | 2884 | } |
2885 | if (file_scope) | |
6fb80942 | 2886 | bind (name, x, file_scope, /*invisible=*/false, nested, UNKNOWN_LOCATION); |
51ef3909 | 2887 | |
3bdb6310 | 2888 | return x; |
51ef3909 | 2889 | } |
2890 | \f | |
393b349a | 2891 | static void |
2892 | implicit_decl_warning (tree id, tree olddecl) | |
2893 | { | |
3ba510aa | 2894 | if (warn_implicit_function_declaration) |
393b349a | 2895 | { |
a52d5726 | 2896 | bool warned; |
2897 | ||
3ba510aa | 2898 | if (flag_isoc99) |
21ca8540 | 2899 | warned = pedwarn (input_location, OPT_Wimplicit_function_declaration, |
2900 | "implicit declaration of function %qE", id); | |
48e1416a | 2901 | else |
2902 | warned = warning (OPT_Wimplicit_function_declaration, | |
a52d5726 | 2903 | G_("implicit declaration of function %qE"), id); |
2904 | if (olddecl && warned) | |
2905 | locate_old_decl (olddecl); | |
393b349a | 2906 | } |
393b349a | 2907 | } |
2908 | ||
e60a6f7b | 2909 | /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a |
31ddae9f | 2910 | function of type int (). */ |
51ef3909 | 2911 | |
2912 | tree | |
e60a6f7b | 2913 | implicitly_declare (location_t loc, tree functionid) |
51ef3909 | 2914 | { |
606a02e3 | 2915 | struct c_binding *b; |
2916 | tree decl = 0; | |
f3e21791 | 2917 | tree asmspec_tree; |
2918 | ||
606a02e3 | 2919 | for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed) |
2920 | { | |
2921 | if (B_IN_SCOPE (b, external_scope)) | |
2922 | { | |
2923 | decl = b->decl; | |
2924 | break; | |
2925 | } | |
2926 | } | |
51ef3909 | 2927 | |
3bdb6310 | 2928 | if (decl) |
31ddae9f | 2929 | { |
d75329f0 | 2930 | if (decl == error_mark_node) |
2931 | return decl; | |
2932 | ||
393b349a | 2933 | /* FIXME: Objective-C has weird not-really-builtin functions |
2934 | which are supposed to be visible automatically. They wind up | |
2935 | in the external scope because they're pushed before the file | |
2936 | scope gets created. Catch this here and rebind them into the | |
2937 | file scope. */ | |
9a6486a6 | 2938 | if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl)) |
393b349a | 2939 | { |
4194491a | 2940 | bind (functionid, decl, file_scope, |
6fb80942 | 2941 | /*invisible=*/false, /*nested=*/true, |
2942 | DECL_SOURCE_LOCATION (decl)); | |
393b349a | 2943 | return decl; |
2944 | } | |
2945 | else | |
31ddae9f | 2946 | { |
606a02e3 | 2947 | tree newtype = default_function_type; |
f805d53d | 2948 | if (b->u.type) |
2949 | TREE_TYPE (decl) = b->u.type; | |
393b349a | 2950 | /* Implicit declaration of a function already declared |
2951 | (somehow) in a different scope, or as a built-in. | |
2952 | If this is the first time this has happened, warn; | |
606a02e3 | 2953 | then recycle the old declaration but with the new type. */ |
393b349a | 2954 | if (!C_DECL_IMPLICIT (decl)) |
2955 | { | |
2956 | implicit_decl_warning (functionid, decl); | |
2957 | C_DECL_IMPLICIT (decl) = 1; | |
2958 | } | |
0568d4ea | 2959 | if (DECL_BUILT_IN (decl)) |
2960 | { | |
606a02e3 | 2961 | newtype = build_type_attribute_variant (newtype, |
2962 | TYPE_ATTRIBUTES | |
2963 | (TREE_TYPE (decl))); | |
2964 | if (!comptypes (newtype, TREE_TYPE (decl))) | |
0568d4ea | 2965 | { |
e60a6f7b | 2966 | warning_at (loc, 0, "incompatible implicit declaration of " |
2967 | "built-in function %qD", decl); | |
606a02e3 | 2968 | newtype = TREE_TYPE (decl); |
0568d4ea | 2969 | } |
2970 | } | |
2971 | else | |
2972 | { | |
606a02e3 | 2973 | if (!comptypes (newtype, TREE_TYPE (decl))) |
0568d4ea | 2974 | { |
e60a6f7b | 2975 | error_at (loc, "incompatible implicit declaration of function %qD", decl); |
a52d5726 | 2976 | locate_old_decl (decl); |
0568d4ea | 2977 | } |
2978 | } | |
f805d53d | 2979 | b->u.type = TREE_TYPE (decl); |
606a02e3 | 2980 | TREE_TYPE (decl) = newtype; |
4194491a | 2981 | bind (functionid, decl, current_scope, |
6fb80942 | 2982 | /*invisible=*/false, /*nested=*/true, |
2983 | DECL_SOURCE_LOCATION (decl)); | |
393b349a | 2984 | return decl; |
31ddae9f | 2985 | } |
31ddae9f | 2986 | } |
51ef3909 | 2987 | |
31ddae9f | 2988 | /* Not seen before. */ |
e60a6f7b | 2989 | decl = build_decl (loc, FUNCTION_DECL, functionid, default_function_type); |
5e58c22e | 2990 | DECL_EXTERNAL (decl) = 1; |
51ef3909 | 2991 | TREE_PUBLIC (decl) = 1; |
31ddae9f | 2992 | C_DECL_IMPLICIT (decl) = 1; |
393b349a | 2993 | implicit_decl_warning (functionid, 0); |
f3e21791 | 2994 | asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL); |
2995 | if (asmspec_tree) | |
2996 | set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree)); | |
51ef3909 | 2997 | |
b3924a2c | 2998 | /* C89 says implicit declarations are in the innermost block. |
455730ef | 2999 | So we record the decl in the standard fashion. */ |
31ddae9f | 3000 | decl = pushdecl (decl); |
51ef3909 | 3001 | |
31ddae9f | 3002 | /* No need to call objc_check_decl here - it's a function type. */ |
b2c4af5e | 3003 | rest_of_decl_compilation (decl, 0, 0); |
51ef3909 | 3004 | |
b3924a2c | 3005 | /* Write a record describing this implicit function declaration |
3006 | to the prototypes file (if requested). */ | |
51ef3909 | 3007 | gen_aux_info_record (decl, 0, 1, 0); |
3008 | ||
7d3b509a | 3009 | /* Possibly apply some default attributes to this implicit declaration. */ |
3010 | decl_attributes (&decl, NULL_TREE, 0); | |
3011 | ||
51ef3909 | 3012 | return decl; |
3013 | } | |
3014 | ||
a0c21e2b | 3015 | /* Issue an error message for a reference to an undeclared variable |
3016 | ID, including a reference to a builtin outside of function-call | |
3017 | context. Establish a binding of the identifier to error_mark_node | |
3018 | in an appropriate scope, which will suppress further errors for the | |
8dc938b9 | 3019 | same identifier. The error message should be given location LOC. */ |
a0c21e2b | 3020 | void |
e60a6f7b | 3021 | undeclared_variable (location_t loc, tree id) |
a0c21e2b | 3022 | { |
3023 | static bool already = false; | |
3bdb6310 | 3024 | struct c_scope *scope; |
a0c21e2b | 3025 | |
3026 | if (current_function_decl == 0) | |
3027 | { | |
5fb6a912 | 3028 | error_at (loc, "%qE undeclared here (not in a function)", id); |
3bdb6310 | 3029 | scope = current_scope; |
a0c21e2b | 3030 | } |
3031 | else | |
3032 | { | |
f15f2e56 | 3033 | if (!objc_diagnose_private_ivar (id)) |
3034 | error_at (loc, "%qE undeclared (first use in this function)", id); | |
84166705 | 3035 | if (!already) |
a0c21e2b | 3036 | { |
83d93c3b | 3037 | inform (loc, "each undeclared identifier is reported only" |
3038 | " once for each function it appears in"); | |
a0c21e2b | 3039 | already = true; |
3040 | } | |
3041 | ||
393b349a | 3042 | /* If we are parsing old-style parameter decls, current_function_decl |
a0c938f0 | 3043 | will be nonnull but current_function_scope will be null. */ |
393b349a | 3044 | scope = current_function_scope ? current_function_scope : current_scope; |
a0c21e2b | 3045 | } |
6fb80942 | 3046 | bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false, |
3047 | UNKNOWN_LOCATION); | |
a0c21e2b | 3048 | } |
51ef3909 | 3049 | \f |
bdc33d98 | 3050 | /* Subroutine of lookup_label, declare_label, define_label: construct a |
f805d53d | 3051 | LABEL_DECL with all the proper frills. Also create a struct |
3052 | c_label_vars initialized for the current scope. */ | |
bdc33d98 | 3053 | |
3054 | static tree | |
f805d53d | 3055 | make_label (location_t location, tree name, bool defining, |
3056 | struct c_label_vars **p_label_vars) | |
bdc33d98 | 3057 | { |
e60a6f7b | 3058 | tree label = build_decl (location, LABEL_DECL, name, void_type_node); |
f805d53d | 3059 | struct c_label_vars *label_vars; |
bdc33d98 | 3060 | |
3061 | DECL_CONTEXT (label) = current_function_decl; | |
3062 | DECL_MODE (label) = VOIDmode; | |
bdc33d98 | 3063 | |
ba72912a | 3064 | label_vars = ggc_alloc_c_label_vars (); |
f805d53d | 3065 | label_vars->shadowed = NULL; |
3066 | set_spot_bindings (&label_vars->label_bindings, defining); | |
3067 | label_vars->decls_in_scope = make_tree_vector (); | |
f1f41a6c | 3068 | label_vars->gotos = NULL; |
f805d53d | 3069 | *p_label_vars = label_vars; |
3070 | ||
bdc33d98 | 3071 | return label; |
3072 | } | |
3073 | ||
bdc33d98 | 3074 | /* Get the LABEL_DECL corresponding to identifier NAME as a label. |
51ef3909 | 3075 | Create one if none exists so far for the current function. |
bdc33d98 | 3076 | This is called when a label is used in a goto expression or |
3077 | has its address taken. */ | |
51ef3909 | 3078 | |
3079 | tree | |
bdc33d98 | 3080 | lookup_label (tree name) |
51ef3909 | 3081 | { |
bdc33d98 | 3082 | tree label; |
f805d53d | 3083 | struct c_label_vars *label_vars; |
51ef3909 | 3084 | |
0a4efe82 | 3085 | if (current_function_scope == 0) |
dc5e019a | 3086 | { |
782858b8 | 3087 | error ("label %qE referenced outside of any function", name); |
dc5e019a | 3088 | return 0; |
3089 | } | |
3090 | ||
bdc33d98 | 3091 | /* Use a label already defined or ref'd with this name, but not if |
3092 | it is inherited from a containing function and wasn't declared | |
3093 | using __label__. */ | |
393b349a | 3094 | label = I_LABEL_DECL (name); |
bdc33d98 | 3095 | if (label && (DECL_CONTEXT (label) == current_function_decl |
3096 | || C_DECLARED_LABEL_FLAG (label))) | |
51ef3909 | 3097 | { |
bdc33d98 | 3098 | /* If the label has only been declared, update its apparent |
3099 | location to point here, for better diagnostics if it | |
3100 | turns out not to have been defined. */ | |
f805d53d | 3101 | if (DECL_INITIAL (label) == NULL_TREE) |
346064d9 | 3102 | DECL_SOURCE_LOCATION (label) = input_location; |
bdc33d98 | 3103 | return label; |
51ef3909 | 3104 | } |
3105 | ||
bdc33d98 | 3106 | /* No label binding for that identifier; make one. */ |
f805d53d | 3107 | label = make_label (input_location, name, false, &label_vars); |
51ef3909 | 3108 | |
b3924a2c | 3109 | /* Ordinary labels go in the current function scope. */ |
f805d53d | 3110 | bind_label (name, label, current_function_scope, label_vars); |
3111 | ||
3112 | return label; | |
3113 | } | |
3114 | ||
3115 | /* Issue a warning about DECL for a goto statement at GOTO_LOC going | |
3116 | to LABEL. */ | |
3117 | ||
3118 | static void | |
3119 | warn_about_goto (location_t goto_loc, tree label, tree decl) | |
3120 | { | |
3121 | if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) | |
3122 | error_at (goto_loc, | |
3123 | "jump into scope of identifier with variably modified type"); | |
3124 | else | |
3125 | warning_at (goto_loc, OPT_Wjump_misses_init, | |
3126 | "jump skips variable initialization"); | |
3127 | inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label); | |
3128 | inform (DECL_SOURCE_LOCATION (decl), "%qD declared here", decl); | |
3129 | } | |
3130 | ||
3131 | /* Look up a label because of a goto statement. This is like | |
3132 | lookup_label, but also issues any appropriate warnings. */ | |
3133 | ||
3134 | tree | |
3135 | lookup_label_for_goto (location_t loc, tree name) | |
3136 | { | |
3137 | tree label; | |
3138 | struct c_label_vars *label_vars; | |
3139 | unsigned int ix; | |
3140 | tree decl; | |
3141 | ||
3142 | label = lookup_label (name); | |
3143 | if (label == NULL_TREE) | |
3144 | return NULL_TREE; | |
3145 | ||
3146 | /* If we are jumping to a different function, we can't issue any | |
3147 | useful warnings. */ | |
3148 | if (DECL_CONTEXT (label) != current_function_decl) | |
3149 | { | |
3150 | gcc_assert (C_DECLARED_LABEL_FLAG (label)); | |
3151 | return label; | |
3152 | } | |
3153 | ||
3154 | label_vars = I_LABEL_BINDING (name)->u.label; | |
3155 | ||
3156 | /* If the label has not yet been defined, then push this goto on a | |
3157 | list for possible later warnings. */ | |
3158 | if (label_vars->label_bindings.scope == NULL) | |
3159 | { | |
3160 | struct c_goto_bindings *g; | |
3161 | ||
ba72912a | 3162 | g = ggc_alloc_c_goto_bindings (); |
f805d53d | 3163 | g->loc = loc; |
3164 | set_spot_bindings (&g->goto_bindings, true); | |
f1f41a6c | 3165 | vec_safe_push (label_vars->gotos, g); |
f805d53d | 3166 | return label; |
3167 | } | |
3168 | ||
3169 | /* If there are any decls in label_vars->decls_in_scope, then this | |
3170 | goto has missed the declaration of the decl. This happens for a | |
3171 | case like | |
3172 | int i = 1; | |
3173 | lab: | |
3174 | ... | |
3175 | goto lab; | |
3176 | Issue a warning or error. */ | |
f1f41a6c | 3177 | FOR_EACH_VEC_SAFE_ELT (label_vars->decls_in_scope, ix, decl) |
f805d53d | 3178 | warn_about_goto (loc, label, decl); |
3179 | ||
3180 | if (label_vars->label_bindings.left_stmt_expr) | |
3181 | { | |
3182 | error_at (loc, "jump into statement expression"); | |
3183 | inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label); | |
3184 | } | |
3185 | ||
bdc33d98 | 3186 | return label; |
51ef3909 | 3187 | } |
3188 | ||
bdc33d98 | 3189 | /* Make a label named NAME in the current function, shadowing silently |
3190 | any that may be inherited from containing functions or containing | |
3191 | scopes. This is called for __label__ declarations. */ | |
51ef3909 | 3192 | |
51ef3909 | 3193 | tree |
bdc33d98 | 3194 | declare_label (tree name) |
51ef3909 | 3195 | { |
393b349a | 3196 | struct c_binding *b = I_LABEL_BINDING (name); |
3197 | tree label; | |
f805d53d | 3198 | struct c_label_vars *label_vars; |
51ef3909 | 3199 | |
bdc33d98 | 3200 | /* Check to make sure that the label hasn't already been declared |
3201 | at this scope */ | |
4194491a | 3202 | if (b && B_IN_CURRENT_SCOPE (b)) |
393b349a | 3203 | { |
782858b8 | 3204 | error ("duplicate label declaration %qE", name); |
a52d5726 | 3205 | locate_old_decl (b->decl); |
407dc108 | 3206 | |
393b349a | 3207 | /* Just use the previous declaration. */ |
3208 | return b->decl; | |
3209 | } | |
407dc108 | 3210 | |
f805d53d | 3211 | label = make_label (input_location, name, false, &label_vars); |
bdc33d98 | 3212 | C_DECLARED_LABEL_FLAG (label) = 1; |
51ef3909 | 3213 | |
bdc33d98 | 3214 | /* Declared labels go in the current scope. */ |
f805d53d | 3215 | bind_label (name, label, current_scope, label_vars); |
3216 | ||
bdc33d98 | 3217 | return label; |
51ef3909 | 3218 | } |
3219 | ||
f805d53d | 3220 | /* When we define a label, issue any appropriate warnings if there are |
3221 | any gotos earlier in the function which jump to this label. */ | |
3222 | ||
3223 | static void | |
3224 | check_earlier_gotos (tree label, struct c_label_vars* label_vars) | |
3225 | { | |
3226 | unsigned int ix; | |
3227 | struct c_goto_bindings *g; | |
3228 | ||
f1f41a6c | 3229 | FOR_EACH_VEC_SAFE_ELT (label_vars->gotos, ix, g) |
f805d53d | 3230 | { |
3231 | struct c_binding *b; | |
3232 | struct c_scope *scope; | |
3233 | ||
3234 | /* We have a goto to this label. The goto is going forward. In | |
3235 | g->scope, the goto is going to skip any binding which was | |
3236 | defined after g->bindings_in_scope. */ | |
f583ffd4 | 3237 | if (g->goto_bindings.scope->has_jump_unsafe_decl) |
f805d53d | 3238 | { |
f583ffd4 | 3239 | for (b = g->goto_bindings.scope->bindings; |
3240 | b != g->goto_bindings.bindings_in_scope; | |
3241 | b = b->prev) | |
3242 | { | |
3243 | if (decl_jump_unsafe (b->decl)) | |
3244 | warn_about_goto (g->loc, label, b->decl); | |
3245 | } | |
f805d53d | 3246 | } |
3247 | ||
3248 | /* We also need to warn about decls defined in any scopes | |
3249 | between the scope of the label and the scope of the goto. */ | |
3250 | for (scope = label_vars->label_bindings.scope; | |
3251 | scope != g->goto_bindings.scope; | |
3252 | scope = scope->outer) | |
3253 | { | |
3254 | gcc_assert (scope != NULL); | |
f583ffd4 | 3255 | if (scope->has_jump_unsafe_decl) |
f805d53d | 3256 | { |
f583ffd4 | 3257 | if (scope == label_vars->label_bindings.scope) |
3258 | b = label_vars->label_bindings.bindings_in_scope; | |
3259 | else | |
3260 | b = scope->bindings; | |
3261 | for (; b != NULL; b = b->prev) | |
3262 | { | |
3263 | if (decl_jump_unsafe (b->decl)) | |
3264 | warn_about_goto (g->loc, label, b->decl); | |
3265 | } | |
f805d53d | 3266 | } |
3267 | } | |
3268 | ||
3269 | if (g->goto_bindings.stmt_exprs > 0) | |
3270 | { | |
3271 | error_at (g->loc, "jump into statement expression"); | |
3272 | inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", | |
3273 | label); | |
3274 | } | |
3275 | } | |
3276 | ||
3277 | /* Now that the label is defined, we will issue warnings about | |
3278 | subsequent gotos to this label when we see them. */ | |
f1f41a6c | 3279 | vec_safe_truncate (label_vars->gotos, 0); |
f805d53d | 3280 | label_vars->gotos = NULL; |
3281 | } | |
3282 | ||
51ef3909 | 3283 | /* Define a label, specifying the location in the source file. |
3284 | Return the LABEL_DECL node for the label, if the definition is valid. | |
3285 | Otherwise return 0. */ | |
3286 | ||
3287 | tree | |
92ddaf90 | 3288 | define_label (location_t location, tree name) |
51ef3909 | 3289 | { |
bdc33d98 | 3290 | /* Find any preexisting label with this name. It is an error |
3291 | if that label has already been defined in this function, or | |
3292 | if there is a containing function with a declared label with | |
3293 | the same name. */ | |
393b349a | 3294 | tree label = I_LABEL_DECL (name); |
bdc33d98 | 3295 | |
3296 | if (label | |
3297 | && ((DECL_CONTEXT (label) == current_function_decl | |
3298 | && DECL_INITIAL (label) != 0) | |
3299 | || (DECL_CONTEXT (label) != current_function_decl | |
3300 | && C_DECLARED_LABEL_FLAG (label)))) | |
51ef3909 | 3301 | { |
e60a6f7b | 3302 | error_at (location, "duplicate label %qD", label); |
a52d5726 | 3303 | locate_old_decl (label); |
bdc33d98 | 3304 | return 0; |
51ef3909 | 3305 | } |
bdc33d98 | 3306 | else if (label && DECL_CONTEXT (label) == current_function_decl) |
51ef3909 | 3307 | { |
f805d53d | 3308 | struct c_label_vars *label_vars = I_LABEL_BINDING (name)->u.label; |
3309 | ||
bdc33d98 | 3310 | /* The label has been used or declared already in this function, |
3311 | but not defined. Update its location to point to this | |
3312 | definition. */ | |
346064d9 | 3313 | DECL_SOURCE_LOCATION (label) = location; |
f805d53d | 3314 | set_spot_bindings (&label_vars->label_bindings, true); |
3315 | ||
3316 | /* Issue warnings as required about any goto statements from | |
3317 | earlier in the function. */ | |
3318 | check_earlier_gotos (label, label_vars); | |
51ef3909 | 3319 | } |
3320 | else | |
3321 | { | |
f805d53d | 3322 | struct c_label_vars *label_vars; |
3323 | ||
bdc33d98 | 3324 | /* No label binding for that identifier; make one. */ |
f805d53d | 3325 | label = make_label (location, name, true, &label_vars); |
bdc33d98 | 3326 | |
b3924a2c | 3327 | /* Ordinary labels go in the current function scope. */ |
f805d53d | 3328 | bind_label (name, label, current_function_scope, label_vars); |
51ef3909 | 3329 | } |
bdc33d98 | 3330 | |
8b6866af | 3331 | if (!in_system_header && lookup_name (name)) |
e60a6f7b | 3332 | warning_at (location, OPT_Wtraditional, |
3333 | "traditional C lacks a separate namespace " | |
3334 | "for labels, identifier %qE conflicts", name); | |
bdc33d98 | 3335 | |
3336 | /* Mark label as having been defined. */ | |
3337 | DECL_INITIAL (label) = error_mark_node; | |
3338 | return label; | |
51ef3909 | 3339 | } |
51ef3909 | 3340 | \f |
f805d53d | 3341 | /* Get the bindings for a new switch statement. This is used to issue |
3342 | warnings as appropriate for jumps from the switch to case or | |
3343 | default labels. */ | |
3344 | ||
3345 | struct c_spot_bindings * | |
3346 | c_get_switch_bindings (void) | |
3347 | { | |
3348 | struct c_spot_bindings *switch_bindings; | |
3349 | ||
3350 | switch_bindings = XNEW (struct c_spot_bindings); | |
3351 | set_spot_bindings (switch_bindings, true); | |
3352 | return switch_bindings; | |
3353 | } | |
3354 | ||
3355 | void | |
3356 | c_release_switch_bindings (struct c_spot_bindings *bindings) | |
3357 | { | |
3358 | gcc_assert (bindings->stmt_exprs == 0 && !bindings->left_stmt_expr); | |
3359 | XDELETE (bindings); | |
3360 | } | |
3361 | ||
3362 | /* This is called at the point of a case or default label to issue | |
3363 | warnings about decls as needed. It returns true if it found an | |
3364 | error, not just a warning. */ | |
3365 | ||
3366 | bool | |
3367 | c_check_switch_jump_warnings (struct c_spot_bindings *switch_bindings, | |
3368 | location_t switch_loc, location_t case_loc) | |
3369 | { | |
3370 | bool saw_error; | |
3371 | struct c_scope *scope; | |
3372 | ||
3373 | saw_error = false; | |
3374 | for (scope = current_scope; | |
3375 | scope != switch_bindings->scope; | |
3376 | scope = scope->outer) | |
3377 | { | |
3378 | struct c_binding *b; | |
3379 | ||
3380 | gcc_assert (scope != NULL); | |
f583ffd4 | 3381 | |
3382 | if (!scope->has_jump_unsafe_decl) | |
3383 | continue; | |
3384 | ||
f805d53d | 3385 | for (b = scope->bindings; b != NULL; b = b->prev) |
3386 | { | |
3387 | if (decl_jump_unsafe (b->decl)) | |
3388 | { | |
3389 | if (variably_modified_type_p (TREE_TYPE (b->decl), NULL_TREE)) | |
3390 | { | |
3391 | saw_error = true; | |
3392 | error_at (case_loc, | |
3393 | ("switch jumps into scope of identifier with " | |
3394 | "variably modified type")); | |
3395 | } | |
3396 | else | |
3397 | warning_at (case_loc, OPT_Wjump_misses_init, | |
3398 | "switch jumps over variable initialization"); | |
3399 | inform (switch_loc, "switch starts here"); | |
3400 | inform (DECL_SOURCE_LOCATION (b->decl), "%qD declared here", | |
3401 | b->decl); | |
3402 | } | |
3403 | } | |
3404 | } | |
3405 | ||
3406 | if (switch_bindings->stmt_exprs > 0) | |
3407 | { | |
3408 | saw_error = true; | |
3409 | error_at (case_loc, "switch jumps into statement expression"); | |
3410 | inform (switch_loc, "switch starts here"); | |
3411 | } | |
3412 | ||
3413 | return saw_error; | |
3414 | } | |
3415 | \f | |
51ef3909 | 3416 | /* Given NAME, an IDENTIFIER_NODE, |
3417 | return the structure (or union or enum) definition for that name. | |
6e899616 | 3418 | If THISLEVEL_ONLY is nonzero, searches only the current_scope. |
51ef3909 | 3419 | CODE says which kind of type the caller wants; |
3420 | it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE. | |
0b09525f | 3421 | If PLOC is not NULL and this returns non-null, it sets *PLOC to the |
3422 | location where the tag was defined. | |
51ef3909 | 3423 | If the wrong kind of type is found, an error is reported. */ |
3424 | ||
3425 | static tree | |
0b09525f | 3426 | lookup_tag (enum tree_code code, tree name, int thislevel_only, |
3427 | location_t *ploc) | |
51ef3909 | 3428 | { |
393b349a | 3429 | struct c_binding *b = I_TAG_BINDING (name); |
31ddae9f | 3430 | int thislevel = 0; |
51ef3909 | 3431 | |
393b349a | 3432 | if (!b || !b->decl) |
31ddae9f | 3433 | return 0; |
3434 | ||
3435 | /* We only care about whether it's in this level if | |
3436 | thislevel_only was set or it might be a type clash. */ | |
393b349a | 3437 | if (thislevel_only || TREE_CODE (b->decl) != code) |
3438 | { | |
3439 | /* For our purposes, a tag in the external scope is the same as | |
3440 | a tag in the file scope. (Primarily relevant to Objective-C | |
3441 | and its builtin structure tags, which get pushed before the | |
14338e9a | 3442 | file scope is created.) */ |
4194491a | 3443 | if (B_IN_CURRENT_SCOPE (b) |
3444 | || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b))) | |
31ddae9f | 3445 | thislevel = 1; |
51ef3909 | 3446 | } |
31ddae9f | 3447 | |
3448 | if (thislevel_only && !thislevel) | |
3449 | return 0; | |
3450 | ||
393b349a | 3451 | if (TREE_CODE (b->decl) != code) |
31ddae9f | 3452 | { |
3453 | /* Definition isn't the kind we were looking for. */ | |
3454 | pending_invalid_xref = name; | |
bca5a169 | 3455 | pending_invalid_xref_location = input_location; |
31ddae9f | 3456 | |
3457 | /* If in the same binding level as a declaration as a tag | |
3458 | of a different type, this must not be allowed to | |
3459 | shadow that tag, so give the error immediately. | |
3460 | (For example, "struct foo; union foo;" is invalid.) */ | |
3461 | if (thislevel) | |
3462 | pending_xref_error (); | |
3463 | } | |
0b09525f | 3464 | |
3465 | if (ploc != NULL) | |
3466 | *ploc = b->locus; | |
3467 | ||
393b349a | 3468 | return b->decl; |
51ef3909 | 3469 | } |
3470 | ||
3471 | /* Print an error message now | |
3472 | for a recent invalid struct, union or enum cross reference. | |
3473 | We don't print them immediately because they are not invalid | |
3474 | when used in the `struct foo;' construct for shadowing. */ | |
3475 | ||
3476 | void | |
1cae46be | 3477 | pending_xref_error (void) |
51ef3909 | 3478 | { |
3479 | if (pending_invalid_xref != 0) | |
5fb6a912 | 3480 | error_at (pending_invalid_xref_location, "%qE defined as wrong kind of tag", |
3481 | pending_invalid_xref); | |
51ef3909 | 3482 | pending_invalid_xref = 0; |
3483 | } | |
3484 | ||
51ef3909 | 3485 | \f |
6e899616 | 3486 | /* Look up NAME in the current scope and its superiors |
51ef3909 | 3487 | in the namespace of variables, functions and typedefs. |
3488 | Return a ..._DECL node of some kind representing its definition, | |
3489 | or return 0 if it is undefined. */ | |
3490 | ||
3491 | tree | |
1cae46be | 3492 | lookup_name (tree name) |
51ef3909 | 3493 | { |
393b349a | 3494 | struct c_binding *b = I_SYMBOL_BINDING (name); |
4194491a | 3495 | if (b && !b->invisible) |
a4e3ffad | 3496 | { |
3497 | maybe_record_typedef_use (b->decl); | |
3498 | return b->decl; | |
3499 | } | |
393b349a | 3500 | return 0; |
51ef3909 | 3501 | } |
3502 | ||
393b349a | 3503 | /* Similar to `lookup_name' but look only at the indicated scope. */ |
51ef3909 | 3504 | |
31ddae9f | 3505 | static tree |
393b349a | 3506 | lookup_name_in_scope (tree name, struct c_scope *scope) |
51ef3909 | 3507 | { |
393b349a | 3508 | struct c_binding *b; |
31ddae9f | 3509 | |
393b349a | 3510 | for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed) |
4194491a | 3511 | if (B_IN_SCOPE (b, scope)) |
393b349a | 3512 | return b->decl; |
31ddae9f | 3513 | return 0; |
51ef3909 | 3514 | } |
3515 | \f | |
3516 | /* Create the predefined scalar types of C, | |
a92771b8 | 3517 | and some nodes representing standard constants (0, 1, (void *) 0). |
6e899616 | 3518 | Initialize the global scope. |
51ef3909 | 3519 | Make definitions for built-in primitive functions. */ |
3520 | ||
3521 | void | |
1cae46be | 3522 | c_init_decl_processing (void) |
51ef3909 | 3523 | { |
fb050357 | 3524 | location_t save_loc = input_location; |
d9cf68bf | 3525 | |
1576dec7 | 3526 | /* Initialize reserved words for parser. */ |
9ceb1c29 | 3527 | c_parse_init (); |
3528 | ||
b3924a2c | 3529 | current_function_decl = 0; |
4214af46 | 3530 | |
9823d3a9 | 3531 | gcc_obstack_init (&parser_obstack); |
3532 | ||
393b349a | 3533 | /* Make the externals scope. */ |
3534 | push_scope (); | |
3535 | external_scope = current_scope; | |
b3924a2c | 3536 | |
6d042e21 | 3537 | /* Declarations from c_common_nodes_and_builtins must not be associated |
3538 | with this input file, lest we get differences between using and not | |
3539 | using preprocessed headers. */ | |
9a6486a6 | 3540 | input_location = BUILTINS_LOCATION; |
51ef3909 | 3541 | |
174fcc61 | 3542 | c_common_nodes_and_builtins (); |
51ef3909 | 3543 | |
3c2239cf | 3544 | /* In C, comparisons and TRUTH_* expressions have type int. */ |
3545 | truthvalue_type_node = integer_type_node; | |
3546 | truthvalue_true_node = integer_one_node; | |
3547 | truthvalue_false_node = integer_zero_node; | |
3548 | ||
3549 | /* Even in C99, which has a real boolean type. */ | |
e60a6f7b | 3550 | pushdecl (build_decl (UNKNOWN_LOCATION, TYPE_DECL, get_identifier ("_Bool"), |
3c2239cf | 3551 | boolean_type_node)); |
4f9a1c9b | 3552 | |
fb050357 | 3553 | input_location = save_loc; |
6d042e21 | 3554 | |
a7ea5e81 | 3555 | pedantic_lvalues = true; |
42dc8caf | 3556 | |
9e5a737d | 3557 | make_fname_decl = c_make_fname_decl; |
65b7f83f | 3558 | start_fname_decls (); |
51ef3909 | 3559 | } |
3560 | ||
e60a6f7b | 3561 | /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to |
3562 | give the decl, NAME is the initialization string and TYPE_DEP | |
3563 | indicates whether NAME depended on the type of the function. As we | |
3564 | don't yet implement delayed emission of static data, we mark the | |
3565 | decl as emitted so it is not placed in the output. Anything using | |
3566 | it must therefore pull out the STRING_CST initializer directly. | |
3567 | FIXME. */ | |
9e5a737d | 3568 | |
3569 | static tree | |
e60a6f7b | 3570 | c_make_fname_decl (location_t loc, tree id, int type_dep) |
9e5a737d | 3571 | { |
65b7f83f | 3572 | const char *name = fname_as_string (type_dep); |
9e5a737d | 3573 | tree decl, type, init; |
3574 | size_t length = strlen (name); | |
3575 | ||
aebc8537 | 3576 | type = build_array_type (char_type_node, |
3577 | build_index_type (size_int (length))); | |
3578 | type = c_build_qualified_type (type, TYPE_QUAL_CONST); | |
9e5a737d | 3579 | |
e60a6f7b | 3580 | decl = build_decl (loc, VAR_DECL, id, type); |
1cae46be | 3581 | |
9e5a737d | 3582 | TREE_STATIC (decl) = 1; |
3583 | TREE_READONLY (decl) = 1; | |
9e5a737d | 3584 | DECL_ARTIFICIAL (decl) = 1; |
1cae46be | 3585 | |
9e5a737d | 3586 | init = build_string (length + 1, name); |
e47a6f81 | 3587 | free (CONST_CAST (char *, name)); |
9e5a737d | 3588 | TREE_TYPE (init) = type; |
3589 | DECL_INITIAL (decl) = init; | |
65b7f83f | 3590 | |
3591 | TREE_USED (decl) = 1; | |
81010c97 | 3592 | |
c902ba74 | 3593 | if (current_function_decl |
3594 | /* For invalid programs like this: | |
48e1416a | 3595 | |
c902ba74 | 3596 | void foo() |
3597 | const char* p = __FUNCTION__; | |
48e1416a | 3598 | |
c902ba74 | 3599 | the __FUNCTION__ is believed to appear in K&R style function |
3600 | parameter declarator. In that case we still don't have | |
3601 | function_scope. */ | |
852f689e | 3602 | && (!seen_error () || current_function_scope)) |
3bdb6310 | 3603 | { |
3604 | DECL_CONTEXT (decl) = current_function_decl; | |
4194491a | 3605 | bind (id, decl, current_function_scope, |
6fb80942 | 3606 | /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION); |
3bdb6310 | 3607 | } |
31ddae9f | 3608 | |
e60a6f7b | 3609 | finish_decl (decl, loc, init, NULL_TREE, NULL_TREE); |
4214af46 | 3610 | |
9e5a737d | 3611 | return decl; |
3612 | } | |
3613 | ||
08f8d953 | 3614 | tree |
54be5d7e | 3615 | c_builtin_function (tree decl) |
51ef3909 | 3616 | { |
54be5d7e | 3617 | tree type = TREE_TYPE (decl); |
3618 | tree id = DECL_NAME (decl); | |
3619 | ||
3620 | const char *name = IDENTIFIER_POINTER (id); | |
a36cf284 | 3621 | C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type); |
8305149e | 3622 | |
393b349a | 3623 | /* Should never be called on a symbol with a preexisting meaning. */ |
231bd014 | 3624 | gcc_assert (!I_SYMBOL_BINDING (id)); |
393b349a | 3625 | |
6fb80942 | 3626 | bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false, |
3627 | UNKNOWN_LOCATION); | |
393b349a | 3628 | |
24470055 | 3629 | /* Builtins in the implementation namespace are made visible without |
3630 | needing to be explicitly declared. See push_file_scope. */ | |
3631 | if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1]))) | |
3632 | { | |
1767a056 | 3633 | DECL_CHAIN (decl) = visible_builtins; |
24470055 | 3634 | visible_builtins = decl; |
3635 | } | |
3636 | ||
3637 | return decl; | |
3638 | } | |
3639 | ||
3640 | tree | |
3641 | c_builtin_function_ext_scope (tree decl) | |
3642 | { | |
3643 | tree type = TREE_TYPE (decl); | |
3644 | tree id = DECL_NAME (decl); | |
3645 | ||
3646 | const char *name = IDENTIFIER_POINTER (id); | |
a36cf284 | 3647 | C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type); |
24470055 | 3648 | |
6fb80942 | 3649 | bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false, |
3650 | UNKNOWN_LOCATION); | |
24470055 | 3651 | |
393b349a | 3652 | /* Builtins in the implementation namespace are made visible without |
3653 | needing to be explicitly declared. See push_file_scope. */ | |
3654 | if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1]))) | |
3655 | { | |
1767a056 | 3656 | DECL_CHAIN (decl) = visible_builtins; |
393b349a | 3657 | visible_builtins = decl; |
3658 | } | |
51ef3909 | 3659 | |
3660 | return decl; | |
3661 | } | |
3662 | \f | |
3663 | /* Called when a declaration is seen that contains no names to declare. | |
3664 | If its type is a reference to a structure, union or enum inherited | |
3665 | from a containing scope, shadow that tag name for the current scope | |
3666 | with a forward reference. | |
3667 | If its type defines a new named structure or union | |
3668 | or defines an enum, it is valid but we need not do anything here. | |
3669 | Otherwise, it is an error. */ | |
3670 | ||
3671 | void | |
9553111d | 3672 | shadow_tag (const struct c_declspecs *declspecs) |
0d137cd9 | 3673 | { |
3674 | shadow_tag_warned (declspecs, 0); | |
3675 | } | |
3676 | ||
b2c4af5e | 3677 | /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning, |
3678 | but no pedwarn. */ | |
0d137cd9 | 3679 | void |
9553111d | 3680 | shadow_tag_warned (const struct c_declspecs *declspecs, int warned) |
51ef3909 | 3681 | { |
9553111d | 3682 | bool found_tag = false; |
51ef3909 | 3683 | |
70dd11f7 | 3684 | if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p) |
51ef3909 | 3685 | { |
9553111d | 3686 | tree value = declspecs->type; |
19cb6b50 | 3687 | enum tree_code code = TREE_CODE (value); |
51ef3909 | 3688 | |
3689 | if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE) | |
3690 | /* Used to test also that TYPE_SIZE (value) != 0. | |
3691 | That caused warning for `struct foo;' at top level in the file. */ | |
3692 | { | |
31ddae9f | 3693 | tree name = TYPE_NAME (value); |
19cb6b50 | 3694 | tree t; |
51ef3909 | 3695 | |
9553111d | 3696 | found_tag = true; |
51ef3909 | 3697 | |
577f4774 | 3698 | if (declspecs->restrict_p) |
3699 | { | |
3700 | error ("invalid use of %<restrict%>"); | |
3701 | warned = 1; | |
3702 | } | |
3703 | ||
51ef3909 | 3704 | if (name == 0) |
3705 | { | |
677cfa00 | 3706 | if (warned != 1 && code != ENUMERAL_TYPE) |
3707 | /* Empty unnamed enum OK */ | |
51ef3909 | 3708 | { |
21ca8540 | 3709 | pedwarn (input_location, 0, |
3710 | "unnamed struct/union that defines no instances"); | |
51ef3909 | 3711 | warned = 1; |
3712 | } | |
3713 | } | |
ae5ead32 | 3714 | else if (declspecs->typespec_kind != ctsk_tagdef |
3715 | && declspecs->typespec_kind != ctsk_tagfirstref | |
19702c1d | 3716 | && declspecs->storage_class != csc_none) |
3717 | { | |
3718 | if (warned != 1) | |
21ca8540 | 3719 | pedwarn (input_location, 0, |
3720 | "empty declaration with storage class specifier " | |
3721 | "does not redeclare tag"); | |
19702c1d | 3722 | warned = 1; |
3723 | pending_xref_error (); | |
3724 | } | |
ae5ead32 | 3725 | else if (declspecs->typespec_kind != ctsk_tagdef |
3726 | && declspecs->typespec_kind != ctsk_tagfirstref | |
19702c1d | 3727 | && (declspecs->const_p |
3728 | || declspecs->volatile_p | |
b560fabd | 3729 | || declspecs->atomic_p |
6d5d708e | 3730 | || declspecs->restrict_p |
3731 | || declspecs->address_space)) | |
19702c1d | 3732 | { |
3733 | if (warned != 1) | |
21ca8540 | 3734 | pedwarn (input_location, 0, |
3735 | "empty declaration with type qualifier " | |
8864917d | 3736 | "does not redeclare tag"); |
19702c1d | 3737 | warned = 1; |
3738 | pending_xref_error (); | |
3739 | } | |
83e25171 | 3740 | else if (declspecs->typespec_kind != ctsk_tagdef |
3741 | && declspecs->typespec_kind != ctsk_tagfirstref | |
3742 | && declspecs->alignas_p) | |
3743 | { | |
3744 | if (warned != 1) | |
3745 | pedwarn (input_location, 0, | |
3746 | "empty declaration with %<_Alignas%> " | |
3747 | "does not redeclare tag"); | |
3748 | warned = 1; | |
3749 | pending_xref_error (); | |
3750 | } | |
51ef3909 | 3751 | else |
3752 | { | |
19702c1d | 3753 | pending_invalid_xref = 0; |
0b09525f | 3754 | t = lookup_tag (code, name, 1, NULL); |
51ef3909 | 3755 | |
3756 | if (t == 0) | |
3757 | { | |
3758 | t = make_node (code); | |
e60a6f7b | 3759 | pushtag (input_location, name, t); |
51ef3909 | 3760 | } |
3761 | } | |
3762 | } | |
3763 | else | |
3764 | { | |
9553111d | 3765 | if (warned != 1 && !in_system_header) |
677cfa00 | 3766 | { |
21ca8540 | 3767 | pedwarn (input_location, 0, |
3768 | "useless type name in empty declaration"); | |
9553111d | 3769 | warned = 1; |
677cfa00 | 3770 | } |
51ef3909 | 3771 | } |
3772 | } | |
490eec42 | 3773 | else if (warned != 1 && !in_system_header && declspecs->typedef_p) |
9553111d | 3774 | { |
21ca8540 | 3775 | pedwarn (input_location, 0, "useless type name in empty declaration"); |
9553111d | 3776 | warned = 1; |
3777 | } | |
3778 | ||
19702c1d | 3779 | pending_invalid_xref = 0; |
3780 | ||
feb04535 | 3781 | if (declspecs->inline_p) |
3782 | { | |
3783 | error ("%<inline%> in empty declaration"); | |
3784 | warned = 1; | |
3785 | } | |
3786 | ||
985c6e3a | 3787 | if (declspecs->noreturn_p) |
3788 | { | |
3789 | error ("%<_Noreturn%> in empty declaration"); | |
3790 | warned = 1; | |
3791 | } | |
3792 | ||
feb04535 | 3793 | if (current_scope == file_scope && declspecs->storage_class == csc_auto) |
3794 | { | |
3795 | error ("%<auto%> in file-scope empty declaration"); | |
3796 | warned = 1; | |
3797 | } | |
3798 | ||
3799 | if (current_scope == file_scope && declspecs->storage_class == csc_register) | |
3800 | { | |
3801 | error ("%<register%> in file-scope empty declaration"); | |
3802 | warned = 1; | |
3803 | } | |
3804 | ||
3805 | if (!warned && !in_system_header && declspecs->storage_class != csc_none) | |
3806 | { | |
c3ceba8e | 3807 | warning (0, "useless storage class specifier in empty declaration"); |
feb04535 | 3808 | warned = 2; |
3809 | } | |
3810 | ||
3811 | if (!warned && !in_system_header && declspecs->thread_p) | |
3812 | { | |
d184e0c0 | 3813 | warning (0, "useless %qs in empty declaration", |
3814 | declspecs->thread_gnu_p ? "__thread" : "_Thread_local"); | |
feb04535 | 3815 | warned = 2; |
3816 | } | |
3817 | ||
bb476216 | 3818 | if (!warned && !in_system_header && (declspecs->const_p |
3819 | || declspecs->volatile_p | |
b560fabd | 3820 | || declspecs->atomic_p |
6d5d708e | 3821 | || declspecs->restrict_p |
3822 | || declspecs->address_space)) | |
bb476216 | 3823 | { |
c3ceba8e | 3824 | warning (0, "useless type qualifier in empty declaration"); |
bb476216 | 3825 | warned = 2; |
3826 | } | |
3827 | ||
83e25171 | 3828 | if (!warned && !in_system_header && declspecs->alignas_p) |
3829 | { | |
3830 | warning (0, "useless %<_Alignas%> in empty declaration"); | |
3831 | warned = 2; | |
3832 | } | |
3833 | ||
677cfa00 | 3834 | if (warned != 1) |
51ef3909 | 3835 | { |
9553111d | 3836 | if (!found_tag) |
21ca8540 | 3837 | pedwarn (input_location, 0, "empty declaration"); |
51ef3909 | 3838 | } |
3839 | } | |
3840 | \f | |
bb476216 | 3841 | |
3842 | /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_* | |
3843 | bits. SPECS represents declaration specifiers that the grammar | |
3844 | only permits to contain type qualifiers and attributes. */ | |
3845 | ||
3846 | int | |
3847 | quals_from_declspecs (const struct c_declspecs *specs) | |
3848 | { | |
3849 | int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0) | |
3850 | | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0) | |
6d5d708e | 3851 | | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0) |
b560fabd | 3852 | | (specs->atomic_p ? TYPE_QUAL_ATOMIC : 0) |
6d5d708e | 3853 | | (ENCODE_QUAL_ADDR_SPACE (specs->address_space))); |
bb476216 | 3854 | gcc_assert (!specs->type |
3855 | && !specs->decl_attr | |
70dd11f7 | 3856 | && specs->typespec_word == cts_none |
bb476216 | 3857 | && specs->storage_class == csc_none |
3858 | && !specs->typedef_p | |
70dd11f7 | 3859 | && !specs->explicit_signed_p |
bb476216 | 3860 | && !specs->deprecated_p |
70dd11f7 | 3861 | && !specs->long_p |
bb476216 | 3862 | && !specs->long_long_p |
70dd11f7 | 3863 | && !specs->short_p |
3864 | && !specs->signed_p | |
3865 | && !specs->unsigned_p | |
3866 | && !specs->complex_p | |
bb476216 | 3867 | && !specs->inline_p |
985c6e3a | 3868 | && !specs->noreturn_p |
bb476216 | 3869 | && !specs->thread_p); |
3870 | return quals; | |
3871 | } | |
3872 | ||
e60a6f7b | 3873 | /* Construct an array declarator. LOC is the location of the |
3874 | beginning of the array (usually the opening brace). EXPR is the | |
3875 | expression inside [], or NULL_TREE. QUALS are the type qualifiers | |
3876 | inside the [] (to be applied to the pointer to which a parameter | |
3877 | array is converted). STATIC_P is true if "static" is inside the | |
3878 | [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a | |
3879 | VLA of unspecified length which is nevertheless a complete type, | |
3880 | false otherwise. The field for the contained declarator is left to | |
3881 | be filled in by set_array_declarator_inner. */ | |
1fd94215 | 3882 | |
ac206aff | 3883 | struct c_declarator * |
e60a6f7b | 3884 | build_array_declarator (location_t loc, |
3885 | tree expr, struct c_declspecs *quals, bool static_p, | |
4a125bfc | 3886 | bool vla_unspec_p) |
1fd94215 | 3887 | { |
ac206aff | 3888 | struct c_declarator *declarator = XOBNEW (&parser_obstack, |
3889 | struct c_declarator); | |
e60a6f7b | 3890 | declarator->id_loc = loc; |
ac206aff | 3891 | declarator->kind = cdk_array; |
3892 | declarator->declarator = 0; | |
3893 | declarator->u.array.dimen = expr; | |
bb476216 | 3894 | if (quals) |
3895 | { | |
3896 | declarator->u.array.attrs = quals->attrs; | |
3897 | declarator->u.array.quals = quals_from_declspecs (quals); | |
3898 | } | |
3899 | else | |
3900 | { | |
3901 | declarator->u.array.attrs = NULL_TREE; | |
3902 | declarator->u.array.quals = 0; | |
3903 | } | |
ac206aff | 3904 | declarator->u.array.static_p = static_p; |
3905 | declarator->u.array.vla_unspec_p = vla_unspec_p; | |
8864917d | 3906 | if (!flag_isoc99) |
1fd94215 | 3907 | { |
9553111d | 3908 | if (static_p || quals != NULL) |
29438999 | 3909 | pedwarn (loc, OPT_Wpedantic, |
21ca8540 | 3910 | "ISO C90 does not support %<static%> or type " |
b0b1af64 | 3911 | "qualifiers in parameter array declarators"); |
1fd94215 | 3912 | if (vla_unspec_p) |
29438999 | 3913 | pedwarn (loc, OPT_Wpedantic, |
21ca8540 | 3914 | "ISO C90 does not support %<[*]%> array declarators"); |
1fd94215 | 3915 | } |
3916 | if (vla_unspec_p) | |
32d33ab2 | 3917 | { |
3918 | if (!current_scope->parm_flag) | |
3919 | { | |
3920 | /* C99 6.7.5.2p4 */ | |
e60a6f7b | 3921 | error_at (loc, "%<[*]%> not allowed in other than " |
3922 | "function prototype scope"); | |
32d33ab2 | 3923 | declarator->u.array.vla_unspec_p = false; |
3924 | return NULL; | |
3925 | } | |
3926 | current_scope->had_vla_unspec = true; | |
3927 | } | |
ac206aff | 3928 | return declarator; |
1fd94215 | 3929 | } |
3930 | ||
ac206aff | 3931 | /* Set the contained declarator of an array declarator. DECL is the |
3932 | declarator, as constructed by build_array_declarator; INNER is what | |
e6c172ed | 3933 | appears on the left of the []. */ |
1fd94215 | 3934 | |
ac206aff | 3935 | struct c_declarator * |
3936 | set_array_declarator_inner (struct c_declarator *decl, | |
e6c172ed | 3937 | struct c_declarator *inner) |
1fd94215 | 3938 | { |
ac206aff | 3939 | decl->declarator = inner; |
1fd94215 | 3940 | return decl; |
3941 | } | |
4287354c | 3942 | |
3943 | /* INIT is a constructor that forms DECL's initializer. If the final | |
3944 | element initializes a flexible array field, add the size of that | |
3945 | initializer to DECL's size. */ | |
3946 | ||
3947 | static void | |
3948 | add_flexible_array_elts_to_size (tree decl, tree init) | |
3949 | { | |
4287354c | 3950 | tree elt, type; |
3951 | ||
f1f41a6c | 3952 | if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init))) |
4287354c | 3953 | return; |
3954 | ||
f1f41a6c | 3955 | elt = CONSTRUCTOR_ELTS (init)->last ().value; |
4287354c | 3956 | type = TREE_TYPE (elt); |
3957 | if (TREE_CODE (type) == ARRAY_TYPE | |
3958 | && TYPE_SIZE (type) == NULL_TREE | |
3959 | && TYPE_DOMAIN (type) != NULL_TREE | |
3960 | && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE) | |
3961 | { | |
3962 | complete_array_type (&type, elt, false); | |
3963 | DECL_SIZE (decl) | |
3964 | = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type)); | |
3965 | DECL_SIZE_UNIT (decl) | |
3966 | = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type)); | |
3967 | } | |
3968 | } | |
1fd94215 | 3969 | \f |
a75b1c71 | 3970 | /* Decode a "typename", such as "int **", returning a ..._TYPE node. |
3971 | Set *EXPR, if EXPR not NULL, to any expression to be evaluated | |
3972 | before the type name, and set *EXPR_CONST_OPERANDS, if | |
3973 | EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may | |
3974 | appear in a constant expression. */ | |
51ef3909 | 3975 | |
3976 | tree | |
a75b1c71 | 3977 | groktypename (struct c_type_name *type_name, tree *expr, |
3978 | bool *expr_const_operands) | |
51ef3909 | 3979 | { |
ac206aff | 3980 | tree type; |
9553111d | 3981 | tree attrs = type_name->specs->attrs; |
9d45592a | 3982 | |
9553111d | 3983 | type_name->specs->attrs = NULL_TREE; |
9d45592a | 3984 | |
9553111d | 3985 | type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME, |
a75b1c71 | 3986 | false, NULL, &attrs, expr, expr_const_operands, |
3987 | DEPRECATED_NORMAL); | |
9d45592a | 3988 | |
3989 | /* Apply attributes. */ | |
ac206aff | 3990 | decl_attributes (&type, attrs, 0); |
9d45592a | 3991 | |
ac206aff | 3992 | return type; |
51ef3909 | 3993 | } |
3994 | ||
bc7bff74 | 3995 | /* Wrapper for decl_attributes that adds some implicit attributes |
3996 | to VAR_DECLs or FUNCTION_DECLs. */ | |
3997 | ||
3998 | static tree | |
3999 | c_decl_attributes (tree *node, tree attributes, int flags) | |
4000 | { | |
4001 | /* Add implicit "omp declare target" attribute if requested. */ | |
4002 | if (current_omp_declare_target_attribute | |
4003 | && ((TREE_CODE (*node) == VAR_DECL && TREE_STATIC (*node)) | |
4004 | || TREE_CODE (*node) == FUNCTION_DECL)) | |
4005 | { | |
4006 | if (TREE_CODE (*node) == VAR_DECL | |
4007 | && ((DECL_CONTEXT (*node) | |
4008 | && TREE_CODE (DECL_CONTEXT (*node)) == FUNCTION_DECL) | |
4009 | || (current_function_decl && !DECL_EXTERNAL (*node)))) | |
4010 | error ("%q+D in block scope inside of declare target directive", | |
4011 | *node); | |
4012 | else if (TREE_CODE (*node) == VAR_DECL | |
4013 | && !COMPLETE_TYPE_P (TREE_TYPE (*node))) | |
4014 | error ("%q+D in declare target directive does not have mappable type", | |
4015 | *node); | |
4016 | else | |
4017 | attributes = tree_cons (get_identifier ("omp declare target"), | |
4018 | NULL_TREE, attributes); | |
4019 | } | |
4020 | return decl_attributes (node, attributes, flags); | |
4021 | } | |
4022 | ||
4023 | ||
51ef3909 | 4024 | /* Decode a declarator in an ordinary declaration or data definition. |
4025 | This is called as soon as the type information and variable name | |
4026 | have been parsed, before parsing the initializer if any. | |
4027 | Here we create the ..._DECL node, fill in its type, | |
4028 | and put it on the list of decls for the current context. | |
4029 | The ..._DECL node is returned as the value. | |
4030 | ||
4031 | Exception: for arrays where the length is not specified, | |
4032 | the type is left null, to be filled in by `finish_decl'. | |
4033 | ||
4034 | Function definitions do not come here; they go to start_function | |
4035 | instead. However, external and forward declarations of functions | |
4036 | do go through here. Structure field declarations are done by | |
4037 | grokfield and not through here. */ | |
4038 | ||
51ef3909 | 4039 | tree |
9553111d | 4040 | start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs, |
ac206aff | 4041 | bool initialized, tree attributes) |
51ef3909 | 4042 | { |
88da234d | 4043 | tree decl; |
19cb6b50 | 4044 | tree tem; |
a75b1c71 | 4045 | tree expr = NULL_TREE; |
81f218ec | 4046 | enum deprecated_states deprecated_state = DEPRECATED_NORMAL; |
1cae46be | 4047 | |
88da234d | 4048 | /* An object declared as __attribute__((deprecated)) suppresses |
4049 | warnings of uses of other deprecated items. */ | |
4050 | if (lookup_attribute ("deprecated", attributes)) | |
4051 | deprecated_state = DEPRECATED_SUPPRESS; | |
4052 | ||
4053 | decl = grokdeclarator (declarator, declspecs, | |
a75b1c71 | 4054 | NORMAL, initialized, NULL, &attributes, &expr, NULL, |
81f218ec | 4055 | deprecated_state); |
61ba37bf | 4056 | if (!decl) |
4057 | return 0; | |
1cae46be | 4058 | |
a75b1c71 | 4059 | if (expr) |
c6333c6e | 4060 | add_stmt (fold_convert (void_type_node, expr)); |
a75b1c71 | 4061 | |
23efcc02 | 4062 | if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl))) |
3cf8b391 | 4063 | warning (OPT_Wmain, "%q+D is usually a function", decl); |
869a2569 | 4064 | |
51ef3909 | 4065 | if (initialized) |
4066 | /* Is it valid for this decl to have an initializer at all? | |
4067 | If not, set INITIALIZED to zero, which will indirectly | |
393b349a | 4068 | tell 'finish_decl' to ignore the initializer once it is parsed. */ |
51ef3909 | 4069 | switch (TREE_CODE (decl)) |
4070 | { | |
4071 | case TYPE_DECL: | |
b0b1af64 | 4072 | error ("typedef %qD is initialized (use __typeof__ instead)", decl); |
f6f89f14 | 4073 | initialized = 0; |
51ef3909 | 4074 | break; |
4075 | ||
4076 | case FUNCTION_DECL: | |
b0b1af64 | 4077 | error ("function %qD is initialized like a variable", decl); |
51ef3909 | 4078 | initialized = 0; |
4079 | break; | |
4080 | ||
4081 | case PARM_DECL: | |
4082 | /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */ | |
b0b1af64 | 4083 | error ("parameter %qD is initialized", decl); |
51ef3909 | 4084 | initialized = 0; |
4085 | break; | |
4086 | ||
4087 | default: | |
393b349a | 4088 | /* Don't allow initializations for incomplete types except for |
4089 | arrays which might be completed by the initialization. */ | |
ee5b587b | 4090 | |
393b349a | 4091 | /* This can happen if the array size is an undefined macro. |
4092 | We already gave a warning, so we don't need another one. */ | |
ee5b587b | 4093 | if (TREE_TYPE (decl) == error_mark_node) |
4094 | initialized = 0; | |
4095 | else if (COMPLETE_TYPE_P (TREE_TYPE (decl))) | |
51ef3909 | 4096 | { |
4097 | /* A complete type is ok if size is fixed. */ | |
4098 | ||
4099 | if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST | |
4100 | || C_DECL_VARIABLE_SIZE (decl)) | |
4101 | { | |
4102 | error ("variable-sized object may not be initialized"); | |
4103 | initialized = 0; | |
4104 | } | |
4105 | } | |
4106 | else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE) | |
4107 | { | |
b0b1af64 | 4108 | error ("variable %qD has initializer but incomplete type", decl); |
51ef3909 | 4109 | initialized = 0; |
4110 | } | |
5cbd179d | 4111 | else if (C_DECL_VARIABLE_SIZE (decl)) |
4112 | { | |
4113 | /* Although C99 is unclear about whether incomplete arrays | |
4114 | of VLAs themselves count as VLAs, it does not make | |
4115 | sense to permit them to be initialized given that | |
4116 | ordinary VLAs may not be initialized. */ | |
4117 | error ("variable-sized object may not be initialized"); | |
4118 | initialized = 0; | |
4119 | } | |
51ef3909 | 4120 | } |
4121 | ||
4122 | if (initialized) | |
4123 | { | |
393b349a | 4124 | if (current_scope == file_scope) |
51ef3909 | 4125 | TREE_STATIC (decl) = 1; |
4126 | ||
393b349a | 4127 | /* Tell 'pushdecl' this is an initialized decl |
51ef3909 | 4128 | even though we don't yet have the initializer expression. |
393b349a | 4129 | Also tell 'finish_decl' it may store the real initializer. */ |
51ef3909 | 4130 | DECL_INITIAL (decl) = error_mark_node; |
4131 | } | |
4132 | ||
4133 | /* If this is a function declaration, write a record describing it to the | |
4134 | prototypes file (if requested). */ | |
4135 | ||
4136 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
a36cf284 | 4137 | gen_aux_info_record (decl, 0, 0, prototype_p (TREE_TYPE (decl))); |
51ef3909 | 4138 | |
9493f142 | 4139 | /* ANSI specifies that a tentative definition which is not merged with |
4140 | a non-tentative definition behaves exactly like a definition with an | |
4141 | initializer equal to zero. (Section 3.7.2) | |
2a6f0f81 | 4142 | |
4143 | -fno-common gives strict ANSI behavior, though this tends to break | |
4144 | a large body of code that grew up without this rule. | |
4145 | ||
4146 | Thread-local variables are never common, since there's no entrenched | |
4147 | body of code to break, and it allows more efficient variable references | |
d716ce75 | 4148 | in the presence of dynamic linking. */ |
2a6f0f81 | 4149 | |
4150 | if (TREE_CODE (decl) == VAR_DECL | |
4151 | && !initialized | |
4152 | && TREE_PUBLIC (decl) | |
1b53eb20 | 4153 | && !DECL_THREAD_LOCAL_P (decl) |
2a6f0f81 | 4154 | && !flag_no_common) |
9493f142 | 4155 | DECL_COMMON (decl) = 1; |
7c090a86 | 4156 | |
431e45c6 | 4157 | /* Set attributes here so if duplicate decl, will have proper attributes. */ |
bc7bff74 | 4158 | c_decl_attributes (&decl, attributes, 0); |
431e45c6 | 4159 | |
541e4101 | 4160 | /* Handle gnu_inline attribute. */ |
4161 | if (declspecs->inline_p | |
11950bdd | 4162 | && !flag_gnu89_inline |
541e4101 | 4163 | && TREE_CODE (decl) == FUNCTION_DECL |
56f06eef | 4164 | && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl)) |
4165 | || current_function_decl)) | |
541e4101 | 4166 | { |
4167 | if (declspecs->storage_class == csc_auto && current_scope != file_scope) | |
4168 | ; | |
4169 | else if (declspecs->storage_class != csc_static) | |
4170 | DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl); | |
4171 | } | |
541e4101 | 4172 | |
45550790 | 4173 | if (TREE_CODE (decl) == FUNCTION_DECL |
4174 | && targetm.calls.promote_prototypes (TREE_TYPE (decl))) | |
4175 | { | |
ac206aff | 4176 | struct c_declarator *ce = declarator; |
45550790 | 4177 | |
ac206aff | 4178 | if (ce->kind == cdk_pointer) |
4179 | ce = declarator->declarator; | |
4180 | if (ce->kind == cdk_function) | |
45550790 | 4181 | { |
ac206aff | 4182 | tree args = ce->u.arg_info->parms; |
1767a056 | 4183 | for (; args; args = DECL_CHAIN (args)) |
45550790 | 4184 | { |
4185 | tree type = TREE_TYPE (args); | |
3ac12e63 | 4186 | if (type && INTEGRAL_TYPE_P (type) |
45550790 | 4187 | && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) |
b560fabd | 4188 | DECL_ARG_TYPE (args) = c_type_promotes_to (type); |
45550790 | 4189 | } |
4190 | } | |
4191 | } | |
4192 | ||
93f10b04 | 4193 | if (TREE_CODE (decl) == FUNCTION_DECL |
4194 | && DECL_DECLARED_INLINE_P (decl) | |
4195 | && DECL_UNINLINABLE (decl) | |
4196 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl))) | |
3cf8b391 | 4197 | warning (OPT_Wattributes, "inline function %q+D given attribute noinline", |
4198 | decl); | |
93f10b04 | 4199 | |
c42cc79e | 4200 | /* C99 6.7.4p3: An inline definition of a function with external |
4201 | linkage shall not contain a definition of a modifiable object | |
4202 | with static storage duration... */ | |
4203 | if (TREE_CODE (decl) == VAR_DECL | |
4204 | && current_scope != file_scope | |
4205 | && TREE_STATIC (decl) | |
c55e2943 | 4206 | && !TREE_READONLY (decl) |
c42cc79e | 4207 | && DECL_DECLARED_INLINE_P (current_function_decl) |
4208 | && DECL_EXTERNAL (current_function_decl)) | |
551ed71a | 4209 | record_inline_static (input_location, current_function_decl, |
4210 | decl, csi_modifiable); | |
c42cc79e | 4211 | |
e147d6aa | 4212 | if (c_dialect_objc () |
4213 | && (TREE_CODE (decl) == VAR_DECL | |
4214 | || TREE_CODE (decl) == FUNCTION_DECL)) | |
4215 | objc_check_global_decl (decl); | |
4216 | ||
6e899616 | 4217 | /* Add this decl to the current scope. |
51ef3909 | 4218 | TEM may equal DECL or it may be a previous decl of the same name. */ |
4219 | tem = pushdecl (decl); | |
4220 | ||
851ee249 | 4221 | if (initialized && DECL_EXTERNAL (tem)) |
4222 | { | |
4223 | DECL_EXTERNAL (tem) = 0; | |
4224 | TREE_STATIC (tem) = 1; | |
4225 | } | |
8dfad60e | 4226 | |
51ef3909 | 4227 | return tem; |
4228 | } | |
4229 | ||
980b024a | 4230 | /* Subroutine of finish_decl. TYPE is the type of an uninitialized object |
4231 | DECL or the non-array element type if DECL is an uninitialized array. | |
4232 | If that type has a const member, diagnose this. */ | |
4233 | ||
4234 | static void | |
4235 | diagnose_uninitialized_cst_member (tree decl, tree type) | |
4236 | { | |
4237 | tree field; | |
4238 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
4239 | { | |
4240 | tree field_type; | |
4241 | if (TREE_CODE (field) != FIELD_DECL) | |
4242 | continue; | |
4243 | field_type = strip_array_types (TREE_TYPE (field)); | |
4244 | ||
4245 | if (TYPE_QUALS (field_type) & TYPE_QUAL_CONST) | |
4246 | { | |
4247 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat, | |
4248 | "uninitialized const member in %qT is invalid in C++", | |
4249 | strip_array_types (TREE_TYPE (decl))); | |
4250 | inform (DECL_SOURCE_LOCATION (field), "%qD should be initialized", field); | |
4251 | } | |
4252 | ||
4253 | if (TREE_CODE (field_type) == RECORD_TYPE | |
4254 | || TREE_CODE (field_type) == UNION_TYPE) | |
4255 | diagnose_uninitialized_cst_member (decl, field_type); | |
4256 | } | |
4257 | } | |
4258 | ||
51ef3909 | 4259 | /* Finish processing of a declaration; |
4260 | install its initial value. | |
b9c74b4d | 4261 | If ORIGTYPE is not NULL_TREE, it is the original type of INIT. |
51ef3909 | 4262 | If the length of an array type is not known before, |
e60a6f7b | 4263 | it must be determined now, from the initial value, or it is an error. |
4264 | ||
4265 | INIT_LOC is the location of the initial value. */ | |
51ef3909 | 4266 | |
4267 | void | |
e60a6f7b | 4268 | finish_decl (tree decl, location_t init_loc, tree init, |
4269 | tree origtype, tree asmspec_tree) | |
51ef3909 | 4270 | { |
0dd13847 | 4271 | tree type; |
9eba252e | 4272 | bool was_incomplete = (DECL_SIZE (decl) == 0); |
44acf429 | 4273 | const char *asmspec = 0; |
51ef3909 | 4274 | |
1e625a2e | 4275 | /* If a name was specified, get the string. */ |
f3e21791 | 4276 | if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL) |
4277 | && DECL_FILE_SCOPE_P (decl)) | |
ea42c4de | 4278 | asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree); |
51ef3909 | 4279 | if (asmspec_tree) |
408ea82a | 4280 | asmspec = TREE_STRING_POINTER (asmspec_tree); |
51ef3909 | 4281 | |
1a4c44c5 | 4282 | if (TREE_CODE (decl) == VAR_DECL |
4283 | && TREE_STATIC (decl) | |
4284 | && global_bindings_p ()) | |
4285 | /* So decl is a global variable. Record the types it uses | |
4286 | so that we can decide later to emit debug info for them. */ | |
4287 | record_types_used_by_current_var_decl (decl); | |
4288 | ||
51ef3909 | 4289 | /* If `start_decl' didn't like having an initialization, ignore it now. */ |
51ef3909 | 4290 | if (init != 0 && DECL_INITIAL (decl) == 0) |
4291 | init = 0; | |
1cae46be | 4292 | |
51ef3909 | 4293 | /* Don't crash if parm is initialized. */ |
4294 | if (TREE_CODE (decl) == PARM_DECL) | |
4295 | init = 0; | |
4296 | ||
4297 | if (init) | |
e60a6f7b | 4298 | store_init_value (init_loc, decl, init, origtype); |
51ef3909 | 4299 | |
c17b85ea | 4300 | if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL |
b2c4af5e | 4301 | || TREE_CODE (decl) == FUNCTION_DECL |
4302 | || TREE_CODE (decl) == FIELD_DECL)) | |
c17b85ea | 4303 | objc_check_decl (decl); |
4304 | ||
0dd13847 | 4305 | type = TREE_TYPE (decl); |
4306 | ||
8b332087 | 4307 | /* Deduce size of array from initialization, if not already known. */ |
51ef3909 | 4308 | if (TREE_CODE (type) == ARRAY_TYPE |
4309 | && TYPE_DOMAIN (type) == 0 | |
4310 | && TREE_CODE (decl) != TYPE_DECL) | |
4311 | { | |
c271bdb2 | 4312 | bool do_default |
51ef3909 | 4313 | = (TREE_STATIC (decl) |
4314 | /* Even if pedantic, an external linkage array | |
4315 | may have incomplete type at first. */ | |
4316 | ? pedantic && !TREE_PUBLIC (decl) | |
5e58c22e | 4317 | : !DECL_EXTERNAL (decl)); |
51ef3909 | 4318 | int failure |
c271bdb2 | 4319 | = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl), |
4320 | do_default); | |
51ef3909 | 4321 | |
4322 | /* Get the completed type made by complete_array_type. */ | |
4323 | type = TREE_TYPE (decl); | |
4324 | ||
646a1d63 | 4325 | switch (failure) |
51ef3909 | 4326 | { |
646a1d63 | 4327 | case 1: |
3cf8b391 | 4328 | error ("initializer fails to determine size of %q+D", decl); |
646a1d63 | 4329 | break; |
4330 | ||
4331 | case 2: | |
51ef3909 | 4332 | if (do_default) |
3cf8b391 | 4333 | error ("array size missing in %q+D", decl); |
fc7d78c7 | 4334 | /* If a `static' var's size isn't known, |
4335 | make it extern as well as static, so it does not get | |
4336 | allocated. | |
4337 | If it is not `static', then do not mark extern; | |
4338 | finish_incomplete_decl will give it a default size | |
4339 | and it will get allocated. */ | |
84166705 | 4340 | else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl)) |
5e58c22e | 4341 | DECL_EXTERNAL (decl) = 1; |
646a1d63 | 4342 | break; |
4343 | ||
4344 | case 3: | |
3cf8b391 | 4345 | error ("zero or negative size array %q+D", decl); |
646a1d63 | 4346 | break; |
4347 | ||
4348 | case 0: | |
4349 | /* For global variables, update the copy of the type that | |
4350 | exists in the binding. */ | |
4351 | if (TREE_PUBLIC (decl)) | |
4352 | { | |
4353 | struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl)); | |
4354 | while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext)) | |
4355 | b_ext = b_ext->shadowed; | |
4356 | if (b_ext) | |
4357 | { | |
74a1cbcf | 4358 | if (b_ext->u.type && comptypes (b_ext->u.type, type)) |
f805d53d | 4359 | b_ext->u.type = composite_type (b_ext->u.type, type); |
646a1d63 | 4360 | else |
f805d53d | 4361 | b_ext->u.type = type; |
646a1d63 | 4362 | } |
4363 | } | |
4364 | break; | |
4365 | ||
4366 | default: | |
4367 | gcc_unreachable (); | |
51ef3909 | 4368 | } |
51ef3909 | 4369 | |
c271bdb2 | 4370 | if (DECL_INITIAL (decl)) |
4371 | TREE_TYPE (DECL_INITIAL (decl)) = type; | |
4372 | ||
d43c4681 | 4373 | relayout_decl (decl); |
51ef3909 | 4374 | } |
4375 | ||
4376 | if (TREE_CODE (decl) == VAR_DECL) | |
4377 | { | |
4287354c | 4378 | if (init && TREE_CODE (init) == CONSTRUCTOR) |
4379 | add_flexible_array_elts_to_size (decl, init); | |
4380 | ||
ee5b587b | 4381 | if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node |
4382 | && COMPLETE_TYPE_P (TREE_TYPE (decl))) | |
42aee427 | 4383 | layout_decl (decl, 0); |
4384 | ||
5905b12b | 4385 | if (DECL_SIZE (decl) == 0 |
ee5b587b | 4386 | /* Don't give an error if we already gave one earlier. */ |
4387 | && TREE_TYPE (decl) != error_mark_node | |
5905b12b | 4388 | && (TREE_STATIC (decl) |
b2c4af5e | 4389 | /* A static variable with an incomplete type |
4390 | is an error if it is initialized. | |
4391 | Also if it is not file scope. | |
4392 | Otherwise, let it through, but if it is not `extern' | |
4393 | then it may cause an error message later. */ | |
4394 | ? (DECL_INITIAL (decl) != 0 | |
3a2bf8d3 | 4395 | || !DECL_FILE_SCOPE_P (decl)) |
b2c4af5e | 4396 | /* An automatic variable with an incomplete type |
4397 | is an error. */ | |
4398 | : !DECL_EXTERNAL (decl))) | |
4399 | { | |
3cf8b391 | 4400 | error ("storage size of %q+D isn%'t known", decl); |
b2c4af5e | 4401 | TREE_TYPE (decl) = error_mark_node; |
4402 | } | |
51ef3909 | 4403 | |
5e58c22e | 4404 | if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl)) |
ad5a5207 | 4405 | && DECL_SIZE (decl) != 0) |
d645d7e9 | 4406 | { |
4407 | if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST) | |
4408 | constant_expression_warning (DECL_SIZE (decl)); | |
4409 | else | |
1f93c018 | 4410 | { |
4411 | error ("storage size of %q+D isn%'t constant", decl); | |
4412 | TREE_TYPE (decl) = error_mark_node; | |
4413 | } | |
d645d7e9 | 4414 | } |
0dbd1c74 | 4415 | |
4214af46 | 4416 | if (TREE_USED (type)) |
abc6c64f | 4417 | { |
4418 | TREE_USED (decl) = 1; | |
4419 | DECL_READ_P (decl) = 1; | |
4420 | } | |
51ef3909 | 4421 | } |
4422 | ||
d459e0d8 | 4423 | /* If this is a function and an assembler name is specified, reset DECL_RTL |
b9a16870 | 4424 | so we can give it its new name. Also, update builtin_decl if it |
d459e0d8 | 4425 | was a normal built-in. */ |
3eee62d8 | 4426 | if (TREE_CODE (decl) == FUNCTION_DECL && asmspec) |
4214af46 | 4427 | { |
d459e0d8 | 4428 | if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL) |
46a7e216 | 4429 | set_builtin_user_assembler_name (decl, asmspec); |
b2c4af5e | 4430 | set_user_assembler_name (decl, asmspec); |
4214af46 | 4431 | } |
3eee62d8 | 4432 | |
418089c3 | 4433 | /* If #pragma weak was used, mark the decl weak now. */ |
3656266b | 4434 | maybe_apply_pragma_weak (decl); |
418089c3 | 4435 | |
51ef3909 | 4436 | /* Output the assembler code and/or RTL code for variables and functions, |
4437 | unless the type is an undefined structure or union. | |
4438 | If not, it will get done when the type is completed. */ | |
4439 | ||
4440 | if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL) | |
4441 | { | |
4a2849cb | 4442 | /* Determine the ELF visibility. */ |
4443 | if (TREE_PUBLIC (decl)) | |
4444 | c_determine_visibility (decl); | |
4445 | ||
952e555e | 4446 | /* This is a no-op in c-lang.c or something real in objc-act.c. */ |
c0f19401 | 4447 | if (c_dialect_objc ()) |
952e555e | 4448 | objc_check_decl (decl); |
e41f0d80 | 4449 | |
a0c938f0 | 4450 | if (asmspec) |
b2c4af5e | 4451 | { |
4452 | /* If this is not a static variable, issue a warning. | |
4453 | It doesn't make any sense to give an ASMSPEC for an | |
4454 | ordinary, non-register local variable. Historically, | |
4455 | GCC has accepted -- but ignored -- the ASMSPEC in | |
4456 | this case. */ | |
84166705 | 4457 | if (!DECL_FILE_SCOPE_P (decl) |
b2c4af5e | 4458 | && TREE_CODE (decl) == VAR_DECL |
4459 | && !C_DECL_REGISTER (decl) | |
4460 | && !TREE_STATIC (decl)) | |
3cf8b391 | 4461 | warning (0, "ignoring asm-specifier for non-static local " |
4462 | "variable %q+D", decl); | |
b2c4af5e | 4463 | else |
4464 | set_user_assembler_name (decl, asmspec); | |
4465 | } | |
a0c938f0 | 4466 | |
3a2bf8d3 | 4467 | if (DECL_FILE_SCOPE_P (decl)) |
0986aa2c | 4468 | { |
4469 | if (DECL_INITIAL (decl) == NULL_TREE | |
4470 | || DECL_INITIAL (decl) == error_mark_node) | |
4471 | /* Don't output anything | |
4472 | when a tentative file-scope definition is seen. | |
4473 | But at end of compilation, do output code for them. */ | |
4474 | DECL_DEFER_OUTPUT (decl) = 1; | |
2be90eed | 4475 | if (asmspec && C_DECL_REGISTER (decl)) |
4476 | DECL_HARD_REGISTER (decl) = 1; | |
b2c4af5e | 4477 | rest_of_decl_compilation (decl, true, 0); |
0986aa2c | 4478 | } |
e41f0d80 | 4479 | else |
4480 | { | |
b2c4af5e | 4481 | /* In conjunction with an ASMSPEC, the `register' |
4482 | keyword indicates that we should place the variable | |
4483 | in a particular register. */ | |
4484 | if (asmspec && C_DECL_REGISTER (decl)) | |
ace65efd | 4485 | { |
b2c4af5e | 4486 | DECL_HARD_REGISTER (decl) = 1; |
4487 | /* This cannot be done for a structure with volatile | |
4488 | fields, on which DECL_REGISTER will have been | |
4489 | reset. */ | |
4490 | if (!DECL_REGISTER (decl)) | |
4491 | error ("cannot put object with volatile field into register"); | |
ace65efd | 4492 | } |
cd5abf58 | 4493 | |
baf262a5 | 4494 | if (TREE_CODE (decl) != FUNCTION_DECL) |
2e3f4877 | 4495 | { |
4496 | /* If we're building a variable sized type, and we might be | |
4497 | reachable other than via the top of the current binding | |
4498 | level, then create a new BIND_EXPR so that we deallocate | |
4499 | the object at the right time. */ | |
4500 | /* Note that DECL_SIZE can be null due to errors. */ | |
4501 | if (DECL_SIZE (decl) | |
4502 | && !TREE_CONSTANT (DECL_SIZE (decl)) | |
4503 | && STATEMENT_LIST_HAS_LABEL (cur_stmt_list)) | |
4504 | { | |
4505 | tree bind; | |
14ae0310 | 4506 | bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL); |
2e3f4877 | 4507 | TREE_SIDE_EFFECTS (bind) = 1; |
4508 | add_stmt (bind); | |
4509 | BIND_EXPR_BODY (bind) = push_stmt_list (); | |
4510 | } | |
e60a6f7b | 4511 | add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), |
4512 | DECL_EXPR, decl)); | |
2e3f4877 | 4513 | } |
e41f0d80 | 4514 | } |
a0c938f0 | 4515 | |
f8b540f2 | 4516 | |
3a2bf8d3 | 4517 | if (!DECL_FILE_SCOPE_P (decl)) |
51ef3909 | 4518 | { |
4519 | /* Recompute the RTL of a local array now | |
4520 | if it used to be an incomplete type. */ | |
4521 | if (was_incomplete | |
84166705 | 4522 | && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl)) |
51ef3909 | 4523 | { |
4524 | /* If we used it already as memory, it must stay in memory. */ | |
4525 | TREE_ADDRESSABLE (decl) = TREE_USED (decl); | |
4526 | /* If it's still incomplete now, no init will save it. */ | |
4527 | if (DECL_SIZE (decl) == 0) | |
4528 | DECL_INITIAL (decl) = 0; | |
51ef3909 | 4529 | } |
51ef3909 | 4530 | } |
4531 | } | |
4532 | ||
4533 | if (TREE_CODE (decl) == TYPE_DECL) | |
ab7083b0 | 4534 | { |
4535 | if (!DECL_FILE_SCOPE_P (decl) | |
1f8a6ff8 | 4536 | && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) |
e60a6f7b | 4537 | add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl)); |
ab7083b0 | 4538 | |
b2c4af5e | 4539 | rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0); |
ab7083b0 | 4540 | } |
51ef3909 | 4541 | |
7acb29a3 | 4542 | /* Install a cleanup (aka destructor) if one was given. */ |
4543 | if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl)) | |
4544 | { | |
4545 | tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl)); | |
4546 | if (attr) | |
4547 | { | |
7acb29a3 | 4548 | tree cleanup_id = TREE_VALUE (TREE_VALUE (attr)); |
4549 | tree cleanup_decl = lookup_name (cleanup_id); | |
4550 | tree cleanup; | |
f1f41a6c | 4551 | vec<tree, va_gc> *v; |
7acb29a3 | 4552 | |
4553 | /* Build "cleanup(&decl)" for the destructor. */ | |
b6889cb0 | 4554 | cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0); |
f1f41a6c | 4555 | vec_alloc (v, 1); |
4556 | v->quick_push (cleanup); | |
e60a6f7b | 4557 | cleanup = build_function_call_vec (DECL_SOURCE_LOCATION (decl), |
f1f41a6c | 4558 | cleanup_decl, v, NULL); |
4559 | vec_free (v); | |
7acb29a3 | 4560 | |
4561 | /* Don't warn about decl unused; the cleanup uses it. */ | |
4562 | TREE_USED (decl) = 1; | |
2363ef00 | 4563 | TREE_USED (cleanup_decl) = 1; |
abc6c64f | 4564 | DECL_READ_P (decl) = 1; |
7acb29a3 | 4565 | |
2363ef00 | 4566 | push_cleanup (decl, cleanup, false); |
7acb29a3 | 4567 | } |
4568 | } | |
1a7c0ccb | 4569 | |
4570 | if (warn_cxx_compat | |
4571 | && TREE_CODE (decl) == VAR_DECL | |
1a7c0ccb | 4572 | && !DECL_EXTERNAL (decl) |
4573 | && DECL_INITIAL (decl) == NULL_TREE) | |
980b024a | 4574 | { |
4575 | type = strip_array_types (type); | |
4576 | if (TREE_READONLY (decl)) | |
4577 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat, | |
4578 | "uninitialized const %qD is invalid in C++", decl); | |
4579 | else if ((TREE_CODE (type) == RECORD_TYPE | |
4580 | || TREE_CODE (type) == UNION_TYPE) | |
4581 | && C_TYPE_FIELDS_READONLY (type)) | |
4582 | diagnose_uninitialized_cst_member (decl, type); | |
4583 | } | |
e4ae859d | 4584 | |
4585 | invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl); | |
51ef3909 | 4586 | } |
4587 | ||
4232a958 | 4588 | /* Given a parsed parameter declaration, decode it into a PARM_DECL. |
4589 | EXPR is NULL or a pointer to an expression that needs to be | |
4590 | evaluated for the side effects of array size expressions in the | |
4591 | parameters. */ | |
7c42cc36 | 4592 | |
4593 | tree | |
4232a958 | 4594 | grokparm (const struct c_parm *parm, tree *expr) |
7c42cc36 | 4595 | { |
e47ffaae | 4596 | tree attrs = parm->attrs; |
ac206aff | 4597 | tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, |
4232a958 | 4598 | NULL, &attrs, expr, NULL, DEPRECATED_NORMAL); |
7c42cc36 | 4599 | |
e47ffaae | 4600 | decl_attributes (&decl, attrs, 0); |
7c42cc36 | 4601 | |
4602 | return decl; | |
4603 | } | |
4604 | ||
f74be9a1 | 4605 | /* Given a parsed parameter declaration, decode it into a PARM_DECL |
4232a958 | 4606 | and push that on the current scope. EXPR is a pointer to an |
4607 | expression that needs to be evaluated for the side effects of array | |
4608 | size expressions in the parameters. */ | |
51ef3909 | 4609 | |
4610 | void | |
4232a958 | 4611 | push_parm_decl (const struct c_parm *parm, tree *expr) |
51ef3909 | 4612 | { |
e47ffaae | 4613 | tree attrs = parm->attrs; |
13b566b4 | 4614 | tree decl; |
b3924a2c | 4615 | |
81f218ec | 4616 | decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL, |
4232a958 | 4617 | &attrs, expr, NULL, DEPRECATED_NORMAL); |
e47ffaae | 4618 | decl_attributes (&decl, attrs, 0); |
195f9646 | 4619 | |
51ef3909 | 4620 | decl = pushdecl (decl); |
4621 | ||
e60a6f7b | 4622 | finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE); |
51ef3909 | 4623 | } |
4624 | ||
393b349a | 4625 | /* Mark all the parameter declarations to date as forward decls. |
3bdb6310 | 4626 | Also diagnose use of this extension. */ |
51ef3909 | 4627 | |
4628 | void | |
f74be9a1 | 4629 | mark_forward_parm_decls (void) |
51ef3909 | 4630 | { |
393b349a | 4631 | struct c_binding *b; |
f74be9a1 | 4632 | |
4633 | if (pedantic && !current_scope->warned_forward_parm_decls) | |
4634 | { | |
29438999 | 4635 | pedwarn (input_location, OPT_Wpedantic, |
21ca8540 | 4636 | "ISO C forbids forward parameter declarations"); |
f74be9a1 | 4637 | current_scope->warned_forward_parm_decls = true; |
4638 | } | |
4639 | ||
393b349a | 4640 | for (b = current_scope->bindings; b; b = b->prev) |
4641 | if (TREE_CODE (b->decl) == PARM_DECL) | |
4642 | TREE_ASM_WRITTEN (b->decl) = 1; | |
51ef3909 | 4643 | } |
4644 | \f | |
ec11e38e | 4645 | /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound |
4646 | literal, which may be an incomplete array type completed by the | |
e60a6f7b | 4647 | initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound |
a75b1c71 | 4648 | literal. NON_CONST is true if the initializers contain something |
4649 | that cannot occur in a constant expression. */ | |
ec11e38e | 4650 | |
4651 | tree | |
e60a6f7b | 4652 | build_compound_literal (location_t loc, tree type, tree init, bool non_const) |
ec11e38e | 4653 | { |
4654 | /* We do not use start_decl here because we have a type, not a declarator; | |
4655 | and do not use finish_decl because the decl should be stored inside | |
7dd37241 | 4656 | the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */ |
5cbd179d | 4657 | tree decl; |
ec11e38e | 4658 | tree complit; |
fccd796a | 4659 | tree stmt; |
5cbd179d | 4660 | |
47321b26 | 4661 | if (type == error_mark_node |
4662 | || init == error_mark_node) | |
5cbd179d | 4663 | return error_mark_node; |
4664 | ||
e60a6f7b | 4665 | decl = build_decl (loc, VAR_DECL, NULL_TREE, type); |
ec11e38e | 4666 | DECL_EXTERNAL (decl) = 0; |
4667 | TREE_PUBLIC (decl) = 0; | |
393b349a | 4668 | TREE_STATIC (decl) = (current_scope == file_scope); |
ec11e38e | 4669 | DECL_CONTEXT (decl) = current_function_decl; |
4670 | TREE_USED (decl) = 1; | |
abc6c64f | 4671 | DECL_READ_P (decl) = 1; |
ec11e38e | 4672 | TREE_TYPE (decl) = type; |
73242672 | 4673 | TREE_READONLY (decl) = (TYPE_READONLY (type) |
4674 | || (TREE_CODE (type) == ARRAY_TYPE | |
4675 | && TYPE_READONLY (TREE_TYPE (type)))); | |
e60a6f7b | 4676 | store_init_value (loc, decl, init, NULL_TREE); |
ec11e38e | 4677 | |
4678 | if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type)) | |
4679 | { | |
c271bdb2 | 4680 | int failure = complete_array_type (&TREE_TYPE (decl), |
4681 | DECL_INITIAL (decl), true); | |
231bd014 | 4682 | gcc_assert (!failure); |
c271bdb2 | 4683 | |
4684 | type = TREE_TYPE (decl); | |
4685 | TREE_TYPE (DECL_INITIAL (decl)) = type; | |
ec11e38e | 4686 | } |
4687 | ||
ec11e38e | 4688 | if (type == error_mark_node || !COMPLETE_TYPE_P (type)) |
4269c49c | 4689 | { |
4690 | c_incomplete_type_error (NULL_TREE, type); | |
4691 | return error_mark_node; | |
4692 | } | |
ec11e38e | 4693 | |
e60a6f7b | 4694 | stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl); |
c271bdb2 | 4695 | complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt); |
ec11e38e | 4696 | TREE_SIDE_EFFECTS (complit) = 1; |
4697 | ||
4698 | layout_decl (decl, 0); | |
4699 | ||
4700 | if (TREE_STATIC (decl)) | |
4701 | { | |
79b01846 | 4702 | /* This decl needs a name for the assembler output. */ |
4703 | set_compound_literal_name (decl); | |
9a7bab7f | 4704 | DECL_DEFER_OUTPUT (decl) = 1; |
4705 | DECL_COMDAT (decl) = 1; | |
4706 | DECL_ARTIFICIAL (decl) = 1; | |
553acd9c | 4707 | DECL_IGNORED_P (decl) = 1; |
9a7bab7f | 4708 | pushdecl (decl); |
b2c4af5e | 4709 | rest_of_decl_compilation (decl, 1, 0); |
ec11e38e | 4710 | } |
4711 | ||
a75b1c71 | 4712 | if (non_const) |
4713 | { | |
4714 | complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit); | |
4715 | C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1; | |
4716 | } | |
4717 | ||
ec11e38e | 4718 | return complit; |
4719 | } | |
0b09525f | 4720 | |
4721 | /* Check the type of a compound literal. Here we just check that it | |
4722 | is valid for C++. */ | |
4723 | ||
4724 | void | |
e60a6f7b | 4725 | check_compound_literal_type (location_t loc, struct c_type_name *type_name) |
0b09525f | 4726 | { |
ae5ead32 | 4727 | if (warn_cxx_compat |
4728 | && (type_name->specs->typespec_kind == ctsk_tagdef | |
4729 | || type_name->specs->typespec_kind == ctsk_tagfirstref)) | |
0b09525f | 4730 | warning_at (loc, OPT_Wc___compat, |
4731 | "defining a type in a compound literal is invalid in C++"); | |
4732 | } | |
ec11e38e | 4733 | \f |
ce09bc13 | 4734 | /* Determine whether TYPE is a structure with a flexible array member, |
4735 | or a union containing such a structure (possibly recursively). */ | |
4736 | ||
4737 | static bool | |
1cae46be | 4738 | flexible_array_type_p (tree type) |
ce09bc13 | 4739 | { |
4740 | tree x; | |
4741 | switch (TREE_CODE (type)) | |
4742 | { | |
4743 | case RECORD_TYPE: | |
4744 | x = TYPE_FIELDS (type); | |
4745 | if (x == NULL_TREE) | |
4746 | return false; | |
1767a056 | 4747 | while (DECL_CHAIN (x) != NULL_TREE) |
4748 | x = DECL_CHAIN (x); | |
ce09bc13 | 4749 | if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE |
4750 | && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE | |
4751 | && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE | |
4752 | && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE) | |
4753 | return true; | |
4754 | return false; | |
4755 | case UNION_TYPE: | |
1767a056 | 4756 | for (x = TYPE_FIELDS (type); x != NULL_TREE; x = DECL_CHAIN (x)) |
ce09bc13 | 4757 | { |
4758 | if (flexible_array_type_p (TREE_TYPE (x))) | |
4759 | return true; | |
4760 | } | |
4761 | return false; | |
4762 | default: | |
4763 | return false; | |
4764 | } | |
4765 | } | |
4766 | \f | |
2d1a2840 | 4767 | /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME, |
4768 | replacing with appropriate values if they are invalid. */ | |
4769 | static void | |
d1dd9ac0 | 4770 | check_bitfield_type_and_width (tree *type, tree *width, tree orig_name) |
2d1a2840 | 4771 | { |
4772 | tree type_mv; | |
4773 | unsigned int max_width; | |
4774 | unsigned HOST_WIDE_INT w; | |
d1dd9ac0 | 4775 | const char *name = (orig_name |
4776 | ? identifier_to_locale (IDENTIFIER_POINTER (orig_name)) | |
4777 | : _("<anonymous>")); | |
2d1a2840 | 4778 | |
2d1a2840 | 4779 | /* Detect and ignore out of range field width and process valid |
4780 | field widths. */ | |
59dc2654 | 4781 | if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))) |
2d1a2840 | 4782 | { |
b0b1af64 | 4783 | error ("bit-field %qs width not an integer constant", name); |
2d1a2840 | 4784 | *width = integer_one_node; |
4785 | } | |
4786 | else | |
4787 | { | |
59dc2654 | 4788 | if (TREE_CODE (*width) != INTEGER_CST) |
4789 | { | |
4790 | *width = c_fully_fold (*width, false, NULL); | |
4791 | if (TREE_CODE (*width) == INTEGER_CST) | |
29438999 | 4792 | pedwarn (input_location, OPT_Wpedantic, |
59dc2654 | 4793 | "bit-field %qs width not an integer constant expression", |
4794 | name); | |
4795 | } | |
4796 | if (TREE_CODE (*width) != INTEGER_CST) | |
4797 | { | |
4798 | error ("bit-field %qs width not an integer constant", name); | |
4799 | *width = integer_one_node; | |
4800 | } | |
2d1a2840 | 4801 | constant_expression_warning (*width); |
4802 | if (tree_int_cst_sgn (*width) < 0) | |
4803 | { | |
b0b1af64 | 4804 | error ("negative width in bit-field %qs", name); |
2d1a2840 | 4805 | *width = integer_one_node; |
4806 | } | |
4807 | else if (integer_zerop (*width) && orig_name) | |
4808 | { | |
b0b1af64 | 4809 | error ("zero width for bit-field %qs", name); |
2d1a2840 | 4810 | *width = integer_one_node; |
4811 | } | |
4812 | } | |
4813 | ||
4814 | /* Detect invalid bit-field type. */ | |
4815 | if (TREE_CODE (*type) != INTEGER_TYPE | |
4816 | && TREE_CODE (*type) != BOOLEAN_TYPE | |
4817 | && TREE_CODE (*type) != ENUMERAL_TYPE) | |
4818 | { | |
b0b1af64 | 4819 | error ("bit-field %qs has invalid type", name); |
2d1a2840 | 4820 | *type = unsigned_type_node; |
4821 | } | |
4822 | ||
4823 | type_mv = TYPE_MAIN_VARIANT (*type); | |
8864917d | 4824 | if (!in_system_header |
2d1a2840 | 4825 | && type_mv != integer_type_node |
4826 | && type_mv != unsigned_type_node | |
891e084d | 4827 | && type_mv != boolean_type_node) |
29438999 | 4828 | pedwarn (input_location, OPT_Wpedantic, |
21ca8540 | 4829 | "type of bit-field %qs is a GCC extension", name); |
2d1a2840 | 4830 | |
c17154eb | 4831 | max_width = TYPE_PRECISION (*type); |
2d1a2840 | 4832 | |
4833 | if (0 < compare_tree_int (*width, max_width)) | |
4834 | { | |
b0b1af64 | 4835 | error ("width of %qs exceeds its type", name); |
2d1a2840 | 4836 | w = max_width; |
ceb7b692 | 4837 | *width = build_int_cst (integer_type_node, w); |
2d1a2840 | 4838 | } |
4839 | else | |
6a0712d4 | 4840 | w = tree_to_uhwi (*width); |
2d1a2840 | 4841 | |
4ee9c684 | 4842 | if (TREE_CODE (*type) == ENUMERAL_TYPE) |
4843 | { | |
4844 | struct lang_type *lt = TYPE_LANG_SPECIFIC (*type); | |
14338e9a | 4845 | if (!lt |
5485b959 | 4846 | || w < tree_int_cst_min_precision (lt->enum_min, TYPE_UNSIGNED (*type)) |
4847 | || w < tree_int_cst_min_precision (lt->enum_max, TYPE_UNSIGNED (*type))) | |
c3ceba8e | 4848 | warning (0, "%qs is narrower than values of its type", name); |
4ee9c684 | 4849 | } |
2d1a2840 | 4850 | } |
2ac1e110 | 4851 | |
2d1a2840 | 4852 | \f |
aaafd660 | 4853 | |
4854 | /* Print warning about variable length array if necessary. */ | |
4855 | ||
4856 | static void | |
d1dd9ac0 | 4857 | warn_variable_length_array (tree name, tree size) |
aaafd660 | 4858 | { |
aaafd660 | 4859 | int const_size = TREE_CONSTANT (size); |
4860 | ||
8864917d | 4861 | if (!flag_isoc99 && pedantic && warn_vla != 0) |
aaafd660 | 4862 | { |
4863 | if (const_size) | |
4864 | { | |
4865 | if (name) | |
d1dd9ac0 | 4866 | pedwarn (input_location, OPT_Wvla, |
4867 | "ISO C90 forbids array %qE whose size " | |
aaafd660 | 4868 | "can%'t be evaluated", |
4869 | name); | |
4870 | else | |
21ca8540 | 4871 | pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array whose size " |
aaafd660 | 4872 | "can%'t be evaluated"); |
4873 | } | |
4874 | else | |
4875 | { | |
48e1416a | 4876 | if (name) |
d1dd9ac0 | 4877 | pedwarn (input_location, OPT_Wvla, |
4878 | "ISO C90 forbids variable length array %qE", | |
aaafd660 | 4879 | name); |
4880 | else | |
21ca8540 | 4881 | pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array"); |
aaafd660 | 4882 | } |
4883 | } | |
4884 | else if (warn_vla > 0) | |
4885 | { | |
4886 | if (const_size) | |
4887 | { | |
4888 | if (name) | |
4889 | warning (OPT_Wvla, | |
d1dd9ac0 | 4890 | "the size of array %qE can" |
aaafd660 | 4891 | "%'t be evaluated", name); |
4892 | else | |
4893 | warning (OPT_Wvla, | |
4894 | "the size of array can %'t be evaluated"); | |
4895 | } | |
4896 | else | |
4897 | { | |
4898 | if (name) | |
4899 | warning (OPT_Wvla, | |
d1dd9ac0 | 4900 | "variable length array %qE is used", |
aaafd660 | 4901 | name); |
4902 | else | |
4903 | warning (OPT_Wvla, | |
4904 | "variable length array is used"); | |
4905 | } | |
4906 | } | |
4907 | } | |
4908 | ||
51ef3909 | 4909 | /* Given declspecs and a declarator, |
4910 | determine the name and type of the object declared | |
4911 | and construct a ..._DECL node for it. | |
4912 | (In one case we can return a ..._TYPE node instead. | |
4913 | For invalid input we sometimes return 0.) | |
4914 | ||
9553111d | 4915 | DECLSPECS is a c_declspecs structure for the declaration specifiers. |
51ef3909 | 4916 | |
4917 | DECL_CONTEXT says which syntactic context this declaration is in: | |
4918 | NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL. | |
4919 | FUNCDEF for a function definition. Like NORMAL but a few different | |
4920 | error messages in each case. Return value may be zero meaning | |
4921 | this definition is too screwy to try to parse. | |
4922 | PARM for a parameter declaration (either within a function prototype | |
4923 | or before a function body). Make a PARM_DECL, or return void_type_node. | |
4924 | TYPENAME if for a typename (in a cast or sizeof). | |
4925 | Don't make a DECL node; just return the ..._TYPE node. | |
4926 | FIELD for a struct or union field; make a FIELD_DECL. | |
4a125bfc | 4927 | INITIALIZED is true if the decl has an initializer. |
2d1a2840 | 4928 | WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node |
4929 | representing the width of the bit-field. | |
e47ffaae | 4930 | DECL_ATTRS points to the list of attributes that should be added to this |
4931 | decl. Any nested attributes that belong on the decl itself will be | |
4932 | added to this list. | |
a75b1c71 | 4933 | If EXPR is not NULL, any expressions that need to be evaluated as |
4934 | part of evaluating variably modified types will be stored in *EXPR. | |
4935 | If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be | |
4936 | set to indicate whether operands in *EXPR can be used in constant | |
4937 | expressions. | |
81f218ec | 4938 | DEPRECATED_STATE is a deprecated_states value indicating whether |
4939 | deprecation warnings should be suppressed. | |
51ef3909 | 4940 | |
4941 | In the TYPENAME case, DECLARATOR is really an absolute declarator. | |
4942 | It may also be so in the PARM case, for a prototype where the | |
4943 | argument type is specified but not the name. | |
4944 | ||
4945 | This function is where the complicated C meanings of `static' | |
08f8d953 | 4946 | and `extern' are interpreted. */ |
51ef3909 | 4947 | |
4948 | static tree | |
9553111d | 4949 | grokdeclarator (const struct c_declarator *declarator, |
4950 | struct c_declspecs *declspecs, | |
81f218ec | 4951 | enum decl_context decl_context, bool initialized, tree *width, |
a75b1c71 | 4952 | tree *decl_attrs, tree *expr, bool *expr_const_operands, |
4953 | enum deprecated_states deprecated_state) | |
51ef3909 | 4954 | { |
9553111d | 4955 | tree type = declspecs->type; |
feb04535 | 4956 | bool threadp = declspecs->thread_p; |
4957 | enum c_storage_class storage_class = declspecs->storage_class; | |
51ef3909 | 4958 | int constp; |
a5b1863e | 4959 | int restrictp; |
51ef3909 | 4960 | int volatilep; |
b560fabd | 4961 | int atomicp; |
a5b1863e | 4962 | int type_quals = TYPE_UNQUALIFIED; |
d1dd9ac0 | 4963 | tree name = NULL_TREE; |
32d33ab2 | 4964 | bool funcdef_flag = false; |
ac206aff | 4965 | bool funcdef_syntax = false; |
b99f3c92 | 4966 | bool size_varies = false; |
70dd11f7 | 4967 | tree decl_attr = declspecs->decl_attr; |
bb476216 | 4968 | int array_ptr_quals = TYPE_UNQUALIFIED; |
4969 | tree array_ptr_attrs = NULL_TREE; | |
1fd94215 | 4970 | int array_parm_static = 0; |
32d33ab2 | 4971 | bool array_parm_vla_unspec_p = false; |
e3c541f0 | 4972 | tree returned_attrs = NULL_TREE; |
2d1a2840 | 4973 | bool bitfield = width != NULL; |
0b351ac2 | 4974 | tree element_type; |
ac206aff | 4975 | struct c_arg_info *arg_info = 0; |
6d5d708e | 4976 | addr_space_t as1, as2, address_space; |
e60a6f7b | 4977 | location_t loc = UNKNOWN_LOCATION; |
2b3c93a3 | 4978 | const char *errmsg; |
a75b1c71 | 4979 | tree expr_dummy; |
4980 | bool expr_const_operands_dummy; | |
4c59b58b | 4981 | enum c_declarator_kind first_non_attr_kind; |
83e25171 | 4982 | unsigned int alignas_align = 0; |
a75b1c71 | 4983 | |
26ee9e7a | 4984 | if (TREE_CODE (type) == ERROR_MARK) |
4985 | return error_mark_node; | |
a75b1c71 | 4986 | if (expr == NULL) |
4987 | expr = &expr_dummy; | |
4988 | if (expr_const_operands == NULL) | |
4989 | expr_const_operands = &expr_const_operands_dummy; | |
4990 | ||
4991 | *expr = declspecs->expr; | |
4992 | *expr_const_operands = declspecs->expr_const_operands; | |
51ef3909 | 4993 | |
4994 | if (decl_context == FUNCDEF) | |
32d33ab2 | 4995 | funcdef_flag = true, decl_context = NORMAL; |
51ef3909 | 4996 | |
51ef3909 | 4997 | /* Look inside a declarator for the name being declared |
d1dd9ac0 | 4998 | and get it as an IDENTIFIER_NODE, for an error message. */ |
51ef3909 | 4999 | { |
ac206aff | 5000 | const struct c_declarator *decl = declarator; |
51ef3909 | 5001 | |
4c59b58b | 5002 | first_non_attr_kind = cdk_attrs; |
51ef3909 | 5003 | while (decl) |
ac206aff | 5004 | switch (decl->kind) |
51ef3909 | 5005 | { |
ac206aff | 5006 | case cdk_array: |
e60a6f7b | 5007 | loc = decl->id_loc; |
5008 | /* FALL THRU. */ | |
5009 | ||
5010 | case cdk_function: | |
ac206aff | 5011 | case cdk_pointer: |
5012 | funcdef_syntax = (decl->kind == cdk_function); | |
5013 | decl = decl->declarator; | |
4c59b58b | 5014 | if (first_non_attr_kind == cdk_attrs) |
5015 | first_non_attr_kind = decl->kind; | |
51ef3909 | 5016 | break; |
5017 | ||
ac206aff | 5018 | case cdk_attrs: |
5019 | decl = decl->declarator; | |
e3c541f0 | 5020 | break; |
5021 | ||
ac206aff | 5022 | case cdk_id: |
e60a6f7b | 5023 | loc = decl->id_loc; |
ac206aff | 5024 | if (decl->u.id) |
d1dd9ac0 | 5025 | name = decl->u.id; |
4c59b58b | 5026 | if (first_non_attr_kind == cdk_attrs) |
5027 | first_non_attr_kind = decl->kind; | |
51ef3909 | 5028 | decl = 0; |
5029 | break; | |
5030 | ||
5031 | default: | |
231bd014 | 5032 | gcc_unreachable (); |
51ef3909 | 5033 | } |
5034 | if (name == 0) | |
d1dd9ac0 | 5035 | { |
5036 | gcc_assert (decl_context == PARM | |
5037 | || decl_context == TYPENAME | |
5038 | || (decl_context == FIELD | |
5039 | && declarator->kind == cdk_id)); | |
5040 | gcc_assert (!initialized); | |
5041 | } | |
51ef3909 | 5042 | } |
5043 | ||
5044 | /* A function definition's declarator must have the form of | |
5045 | a function declarator. */ | |
5046 | ||
ac206aff | 5047 | if (funcdef_flag && !funcdef_syntax) |
51ef3909 | 5048 | return 0; |
5049 | ||
51ef3909 | 5050 | /* If this looks like a function definition, make it one, |
5051 | even if it occurs where parms are expected. | |
5052 | Then store_parm_decls will reject it and not use it as a parm. */ | |
393b349a | 5053 | if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag) |
51ef3909 | 5054 | decl_context = PARM; |
5055 | ||
9553111d | 5056 | if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS) |
45c4e798 | 5057 | warn_deprecated_use (declspecs->type, declspecs->decl_attr); |
51ef3909 | 5058 | |
dc95eae2 | 5059 | if ((decl_context == NORMAL || decl_context == FIELD) |
5060 | && current_scope == file_scope | |
5061 | && variably_modified_type_p (type, NULL_TREE)) | |
5062 | { | |
d1dd9ac0 | 5063 | if (name) |
e60a6f7b | 5064 | error_at (loc, "variably modified %qE at file scope", name); |
d1dd9ac0 | 5065 | else |
e60a6f7b | 5066 | error_at (loc, "variably modified field at file scope"); |
dc95eae2 | 5067 | type = integer_type_node; |
5068 | } | |
5069 | ||
b99f3c92 | 5070 | size_varies = C_TYPE_VARIABLE_SIZE (type) != 0; |
51ef3909 | 5071 | |
70dd11f7 | 5072 | /* Diagnose defaulting to "int". */ |
65a8b580 | 5073 | |
70dd11f7 | 5074 | if (declspecs->default_int_p && !in_system_header) |
51ef3909 | 5075 | { |
70dd11f7 | 5076 | /* Issue a warning if this is an ISO C 99 program or if |
5077 | -Wreturn-type and this is a function, or if -Wimplicit; | |
5078 | prefer the former warning since it is more explicit. */ | |
5079 | if ((warn_implicit_int || warn_return_type || flag_isoc99) | |
5080 | && funcdef_flag) | |
5081 | warn_about_return_type = 1; | |
d1dd9ac0 | 5082 | else |
5083 | { | |
5084 | if (name) | |
48e1416a | 5085 | pedwarn_c99 (loc, flag_isoc99 ? 0 : OPT_Wimplicit_int, |
d1dd9ac0 | 5086 | "type defaults to %<int%> in declaration of %qE", |
5087 | name); | |
5088 | else | |
48e1416a | 5089 | pedwarn_c99 (input_location, flag_isoc99 ? 0 : OPT_Wimplicit_int, |
d1dd9ac0 | 5090 | "type defaults to %<int%> in type name"); |
5091 | } | |
51ef3909 | 5092 | } |
5093 | ||
70dd11f7 | 5094 | /* Adjust the type if a bit-field is being declared, |
5095 | -funsigned-bitfields applied and the type is not explicitly | |
5096 | "signed". */ | |
5097 | if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p | |
5098 | && TREE_CODE (type) == INTEGER_TYPE) | |
75a70cf9 | 5099 | type = unsigned_type_for (type); |
51ef3909 | 5100 | |
a5b1863e | 5101 | /* Figure out the type qualifiers for the declaration. There are |
5102 | two ways a declaration can become qualified. One is something | |
5103 | like `const int i' where the `const' is explicit. Another is | |
5104 | something like `typedef const int CI; CI i' where the type of the | |
0b351ac2 | 5105 | declaration contains the `const'. A third possibility is that |
5106 | there is a type qualifier on the element type of a typedefed | |
5107 | array type, in which case we should extract that qualifier so | |
333adf28 | 5108 | that c_apply_type_quals_to_decl receives the full list of |
0b351ac2 | 5109 | qualifiers to work with (C90 is not entirely clear about whether |
5110 | duplicate qualifiers should be diagnosed in this case, but it | |
5111 | seems most appropriate to do so). */ | |
5112 | element_type = strip_array_types (type); | |
bb476216 | 5113 | constp = declspecs->const_p + TYPE_READONLY (element_type); |
5114 | restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type); | |
5115 | volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type); | |
b560fabd | 5116 | atomicp = declspecs->atomic_p + TYPE_ATOMIC (element_type); |
6d5d708e | 5117 | as1 = declspecs->address_space; |
5118 | as2 = TYPE_ADDR_SPACE (element_type); | |
5119 | address_space = ADDR_SPACE_GENERIC_P (as1)? as2 : as1; | |
5120 | ||
a7b87e06 | 5121 | if (pedantic && !flag_isoc99) |
5122 | { | |
5123 | if (constp > 1) | |
29438999 | 5124 | pedwarn (loc, OPT_Wpedantic, "duplicate %<const%>"); |
a7b87e06 | 5125 | if (restrictp > 1) |
29438999 | 5126 | pedwarn (loc, OPT_Wpedantic, "duplicate %<restrict%>"); |
a7b87e06 | 5127 | if (volatilep > 1) |
29438999 | 5128 | pedwarn (loc, OPT_Wpedantic, "duplicate %<volatile%>"); |
b560fabd | 5129 | if (atomicp > 1) |
5130 | pedwarn (loc, OPT_Wpedantic, "duplicate %<_Atomic%>"); | |
5131 | ||
a7b87e06 | 5132 | } |
6d5d708e | 5133 | |
5134 | if (!ADDR_SPACE_GENERIC_P (as1) && !ADDR_SPACE_GENERIC_P (as2) && as1 != as2) | |
5135 | error_at (loc, "conflicting named address spaces (%s vs %s)", | |
5136 | c_addr_space_name (as1), c_addr_space_name (as2)); | |
5137 | ||
4c59b58b | 5138 | if ((TREE_CODE (type) == ARRAY_TYPE |
5139 | || first_non_attr_kind == cdk_array) | |
5140 | && TYPE_QUALS (element_type)) | |
51ef3909 | 5141 | type = TYPE_MAIN_VARIANT (type); |
a5b1863e | 5142 | type_quals = ((constp ? TYPE_QUAL_CONST : 0) |
5143 | | (restrictp ? TYPE_QUAL_RESTRICT : 0) | |
6d5d708e | 5144 | | (volatilep ? TYPE_QUAL_VOLATILE : 0) |
b560fabd | 5145 | | (atomicp ? TYPE_QUAL_ATOMIC : 0) |
6d5d708e | 5146 | | ENCODE_QUAL_ADDR_SPACE (address_space)); |
51ef3909 | 5147 | |
b560fabd | 5148 | /* Applying the _Atomic qualifier to an array type (through the use |
5149 | of typedefs or typeof) must be detected here. If the qualifier | |
5150 | is introduced later, any appearance of applying it to an array is | |
5151 | actually applying it to an element of that array. */ | |
5152 | if (atomicp && TREE_CODE (type) == ARRAY_TYPE) | |
5153 | error_at (loc, "%<_Atomic%>-qualified array type"); | |
5154 | ||
feb04535 | 5155 | /* Warn about storage classes that are invalid for certain |
5156 | kinds of declarations (parameters, typenames, etc.). */ | |
5157 | ||
5158 | if (funcdef_flag | |
5159 | && (threadp | |
5160 | || storage_class == csc_auto | |
5161 | || storage_class == csc_register | |
5162 | || storage_class == csc_typedef)) | |
5163 | { | |
8864917d | 5164 | if (storage_class == csc_auto) |
48e1416a | 5165 | pedwarn (loc, |
29438999 | 5166 | (current_scope == file_scope) ? 0 : OPT_Wpedantic, |
8864917d | 5167 | "function definition declared %<auto%>"); |
feb04535 | 5168 | if (storage_class == csc_register) |
e60a6f7b | 5169 | error_at (loc, "function definition declared %<register%>"); |
feb04535 | 5170 | if (storage_class == csc_typedef) |
e60a6f7b | 5171 | error_at (loc, "function definition declared %<typedef%>"); |
feb04535 | 5172 | if (threadp) |
d184e0c0 | 5173 | error_at (loc, "function definition declared %qs", |
5174 | declspecs->thread_gnu_p ? "__thread" : "_Thread_local"); | |
feb04535 | 5175 | threadp = false; |
5176 | if (storage_class == csc_auto | |
5177 | || storage_class == csc_register | |
5178 | || storage_class == csc_typedef) | |
5179 | storage_class = csc_none; | |
5180 | } | |
5181 | else if (decl_context != NORMAL && (storage_class != csc_none || threadp)) | |
5182 | { | |
5183 | if (decl_context == PARM && storage_class == csc_register) | |
5184 | ; | |
5185 | else | |
5186 | { | |
5187 | switch (decl_context) | |
5188 | { | |
5189 | case FIELD: | |
d1dd9ac0 | 5190 | if (name) |
e60a6f7b | 5191 | error_at (loc, "storage class specified for structure " |
5192 | "field %qE", name); | |
d1dd9ac0 | 5193 | else |
e60a6f7b | 5194 | error_at (loc, "storage class specified for structure field"); |
feb04535 | 5195 | break; |
5196 | case PARM: | |
d1dd9ac0 | 5197 | if (name) |
e60a6f7b | 5198 | error_at (loc, "storage class specified for parameter %qE", |
5199 | name); | |
d1dd9ac0 | 5200 | else |
e60a6f7b | 5201 | error_at (loc, "storage class specified for unnamed parameter"); |
feb04535 | 5202 | break; |
5203 | default: | |
e60a6f7b | 5204 | error_at (loc, "storage class specified for typename"); |
feb04535 | 5205 | break; |
5206 | } | |
5207 | storage_class = csc_none; | |
5208 | threadp = false; | |
5209 | } | |
5210 | } | |
5211 | else if (storage_class == csc_extern | |
5212 | && initialized | |
5213 | && !funcdef_flag) | |
5214 | { | |
5215 | /* 'extern' with initialization is invalid if not at file scope. */ | |
9096068a | 5216 | if (current_scope == file_scope) |
5217 | { | |
5218 | /* It is fine to have 'extern const' when compiling at C | |
5219 | and C++ intersection. */ | |
5220 | if (!(warn_cxx_compat && constp)) | |
e60a6f7b | 5221 | warning_at (loc, 0, "%qE initialized and declared %<extern%>", |
5222 | name); | |
9096068a | 5223 | } |
feb04535 | 5224 | else |
e60a6f7b | 5225 | error_at (loc, "%qE has both %<extern%> and initializer", name); |
feb04535 | 5226 | } |
5227 | else if (current_scope == file_scope) | |
5228 | { | |
5229 | if (storage_class == csc_auto) | |
e60a6f7b | 5230 | error_at (loc, "file-scope declaration of %qE specifies %<auto%>", |
5231 | name); | |
feb04535 | 5232 | if (pedantic && storage_class == csc_register) |
29438999 | 5233 | pedwarn (input_location, OPT_Wpedantic, |
d1dd9ac0 | 5234 | "file-scope declaration of %qE specifies %<register%>", name); |
feb04535 | 5235 | } |
5236 | else | |
5237 | { | |
5238 | if (storage_class == csc_extern && funcdef_flag) | |
e60a6f7b | 5239 | error_at (loc, "nested function %qE declared %<extern%>", name); |
feb04535 | 5240 | else if (threadp && storage_class == csc_none) |
5241 | { | |
e60a6f7b | 5242 | error_at (loc, "function-scope %qE implicitly auto and declared " |
d184e0c0 | 5243 | "%qs", name, |
5244 | declspecs->thread_gnu_p ? "__thread" : "_Thread_local"); | |
feb04535 | 5245 | threadp = false; |
5246 | } | |
5247 | } | |
51ef3909 | 5248 | |
5249 | /* Now figure out the structure of the declarator proper. | |
5250 | Descend through it, creating more complex types, until we reach | |
aebc8537 | 5251 | the declared identifier (or NULL_TREE, in an absolute declarator). |
5252 | At each stage we maintain an unqualified version of the type | |
5253 | together with any qualifiers that should be applied to it with | |
5254 | c_build_qualified_type; this way, array types including | |
5255 | multidimensional array types are first built up in unqualified | |
5256 | form and then the qualified form is created with | |
5257 | TYPE_MAIN_VARIANT pointing to the unqualified form. */ | |
51ef3909 | 5258 | |
ac206aff | 5259 | while (declarator && declarator->kind != cdk_id) |
51ef3909 | 5260 | { |
5261 | if (type == error_mark_node) | |
5262 | { | |
ac206aff | 5263 | declarator = declarator->declarator; |
51ef3909 | 5264 | continue; |
5265 | } | |
5266 | ||
ac206aff | 5267 | /* Each level of DECLARATOR is either a cdk_array (for ...[..]), |
5268 | a cdk_pointer (for *...), | |
5269 | a cdk_function (for ...(...)), | |
5270 | a cdk_attrs (for nested attributes), | |
5271 | or a cdk_id (for the name being declared | |
5272 | or the place in an absolute declarator | |
51ef3909 | 5273 | where the name was omitted). |
ac206aff | 5274 | For the last case, we have just exited the loop. |
51ef3909 | 5275 | |
5276 | At this point, TYPE is the type of elements of an array, | |
5277 | or for a function to return, or for a pointer to point to. | |
5278 | After this sequence of ifs, TYPE is the type of the | |
5279 | array or function or pointer, and DECLARATOR has had its | |
5280 | outermost layer removed. */ | |
5281 | ||
bb476216 | 5282 | if (array_ptr_quals != TYPE_UNQUALIFIED |
5283 | || array_ptr_attrs != NULL_TREE | |
5284 | || array_parm_static) | |
1fd94215 | 5285 | { |
5286 | /* Only the innermost declarator (making a parameter be of | |
5287 | array type which is converted to pointer type) | |
5288 | may have static or type qualifiers. */ | |
e60a6f7b | 5289 | error_at (loc, "static or type qualifiers in non-parameter array declarator"); |
bb476216 | 5290 | array_ptr_quals = TYPE_UNQUALIFIED; |
5291 | array_ptr_attrs = NULL_TREE; | |
1fd94215 | 5292 | array_parm_static = 0; |
5293 | } | |
5294 | ||
ac206aff | 5295 | switch (declarator->kind) |
51ef3909 | 5296 | { |
ac206aff | 5297 | case cdk_attrs: |
231bd014 | 5298 | { |
ac206aff | 5299 | /* A declarator with embedded attributes. */ |
5300 | tree attrs = declarator->u.attrs; | |
5301 | const struct c_declarator *inner_decl; | |
231bd014 | 5302 | int attr_flags = 0; |
ac206aff | 5303 | declarator = declarator->declarator; |
231bd014 | 5304 | inner_decl = declarator; |
ac206aff | 5305 | while (inner_decl->kind == cdk_attrs) |
5306 | inner_decl = inner_decl->declarator; | |
5307 | if (inner_decl->kind == cdk_id) | |
231bd014 | 5308 | attr_flags |= (int) ATTR_FLAG_DECL_NEXT; |
ac206aff | 5309 | else if (inner_decl->kind == cdk_function) |
231bd014 | 5310 | attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT; |
ac206aff | 5311 | else if (inner_decl->kind == cdk_array) |
231bd014 | 5312 | attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT; |
5313 | returned_attrs = decl_attributes (&type, | |
5314 | chainon (returned_attrs, attrs), | |
5315 | attr_flags); | |
5316 | break; | |
5317 | } | |
ac206aff | 5318 | case cdk_array: |
231bd014 | 5319 | { |
5320 | tree itype = NULL_TREE; | |
ac206aff | 5321 | tree size = declarator->u.array.dimen; |
231bd014 | 5322 | /* The index is a signed object `sizetype' bits wide. */ |
5323 | tree index_type = c_common_signed_type (sizetype); | |
5324 | ||
ac206aff | 5325 | array_ptr_quals = declarator->u.array.quals; |
bb476216 | 5326 | array_ptr_attrs = declarator->u.array.attrs; |
ac206aff | 5327 | array_parm_static = declarator->u.array.static_p; |
32d33ab2 | 5328 | array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p; |
5329 | ||
ac206aff | 5330 | declarator = declarator->declarator; |
231bd014 | 5331 | |
5332 | /* Check for some types that there cannot be arrays of. */ | |
a0c938f0 | 5333 | |
231bd014 | 5334 | if (VOID_TYPE_P (type)) |
5335 | { | |
d1dd9ac0 | 5336 | if (name) |
e60a6f7b | 5337 | error_at (loc, "declaration of %qE as array of voids", name); |
d1dd9ac0 | 5338 | else |
e60a6f7b | 5339 | error_at (loc, "declaration of type name as array of voids"); |
231bd014 | 5340 | type = error_mark_node; |
5341 | } | |
a0c938f0 | 5342 | |
231bd014 | 5343 | if (TREE_CODE (type) == FUNCTION_TYPE) |
5344 | { | |
d1dd9ac0 | 5345 | if (name) |
e60a6f7b | 5346 | error_at (loc, "declaration of %qE as array of functions", |
5347 | name); | |
d1dd9ac0 | 5348 | else |
e60a6f7b | 5349 | error_at (loc, "declaration of type name as array of " |
5350 | "functions"); | |
231bd014 | 5351 | type = error_mark_node; |
5352 | } | |
a0c938f0 | 5353 | |
231bd014 | 5354 | if (pedantic && !in_system_header && flexible_array_type_p (type)) |
29438999 | 5355 | pedwarn (loc, OPT_Wpedantic, |
21ca8540 | 5356 | "invalid use of structure with flexible array member"); |
a0c938f0 | 5357 | |
231bd014 | 5358 | if (size == error_mark_node) |
51ef3909 | 5359 | type = error_mark_node; |
a0c938f0 | 5360 | |
231bd014 | 5361 | if (type == error_mark_node) |
5362 | continue; | |
0dbd1c74 | 5363 | |
231bd014 | 5364 | /* If size was specified, set ITYPE to a range-type for |
5365 | that size. Otherwise, ITYPE remains null. finish_decl | |
5366 | may figure it out from an initial value. */ | |
1b82e858 | 5367 | |
231bd014 | 5368 | if (size) |
5369 | { | |
a75b1c71 | 5370 | bool size_maybe_const = true; |
5371 | bool size_int_const = (TREE_CODE (size) == INTEGER_CST | |
5372 | && !TREE_OVERFLOW (size)); | |
5373 | bool this_size_varies = false; | |
5374 | ||
231bd014 | 5375 | /* Strip NON_LVALUE_EXPRs since we aren't using as an |
5376 | lvalue. */ | |
5377 | STRIP_TYPE_NOPS (size); | |
a0c938f0 | 5378 | |
84166705 | 5379 | if (!INTEGRAL_TYPE_P (TREE_TYPE (size))) |
231bd014 | 5380 | { |
d1dd9ac0 | 5381 | if (name) |
e60a6f7b | 5382 | error_at (loc, "size of array %qE has non-integer type", |
5383 | name); | |
d1dd9ac0 | 5384 | else |
e60a6f7b | 5385 | error_at (loc, |
5386 | "size of unnamed array has non-integer type"); | |
231bd014 | 5387 | size = integer_one_node; |
5388 | } | |
a0c938f0 | 5389 | |
a75b1c71 | 5390 | size = c_fully_fold (size, false, &size_maybe_const); |
5391 | ||
5392 | if (pedantic && size_maybe_const && integer_zerop (size)) | |
d1dd9ac0 | 5393 | { |
5394 | if (name) | |
29438999 | 5395 | pedwarn (loc, OPT_Wpedantic, |
d1dd9ac0 | 5396 | "ISO C forbids zero-size array %qE", name); |
5397 | else | |
29438999 | 5398 | pedwarn (loc, OPT_Wpedantic, |
d1dd9ac0 | 5399 | "ISO C forbids zero-size array"); |
5400 | } | |
a0c938f0 | 5401 | |
a75b1c71 | 5402 | if (TREE_CODE (size) == INTEGER_CST && size_maybe_const) |
231bd014 | 5403 | { |
5404 | constant_expression_warning (size); | |
5405 | if (tree_int_cst_sgn (size) < 0) | |
5406 | { | |
d1dd9ac0 | 5407 | if (name) |
e60a6f7b | 5408 | error_at (loc, "size of array %qE is negative", name); |
d1dd9ac0 | 5409 | else |
e60a6f7b | 5410 | error_at (loc, "size of unnamed array is negative"); |
231bd014 | 5411 | size = integer_one_node; |
5412 | } | |
a75b1c71 | 5413 | /* Handle a size folded to an integer constant but |
5414 | not an integer constant expression. */ | |
5415 | if (!size_int_const) | |
5416 | { | |
ce4e9a43 | 5417 | /* If this is a file scope declaration of an |
5418 | ordinary identifier, this is invalid code; | |
5419 | diagnosing it here and not subsequently | |
5420 | treating the type as variable-length avoids | |
5421 | more confusing diagnostics later. */ | |
5422 | if ((decl_context == NORMAL || decl_context == FIELD) | |
5423 | && current_scope == file_scope) | |
5424 | pedwarn (input_location, 0, | |
d1dd9ac0 | 5425 | "variably modified %qE at file scope", |
5426 | name); | |
ce4e9a43 | 5427 | else |
b99f3c92 | 5428 | this_size_varies = size_varies = true; |
d1dd9ac0 | 5429 | warn_variable_length_array (name, size); |
a75b1c71 | 5430 | } |
231bd014 | 5431 | } |
dc95eae2 | 5432 | else if ((decl_context == NORMAL || decl_context == FIELD) |
5433 | && current_scope == file_scope) | |
5434 | { | |
e60a6f7b | 5435 | error_at (loc, "variably modified %qE at file scope", name); |
dc95eae2 | 5436 | size = integer_one_node; |
5437 | } | |
231bd014 | 5438 | else |
5439 | { | |
5440 | /* Make sure the array size remains visibly | |
5441 | nonconstant even if it is (eg) a const variable | |
5442 | with known value. */ | |
b99f3c92 | 5443 | this_size_varies = size_varies = true; |
d1dd9ac0 | 5444 | warn_variable_length_array (name, size); |
2c4c3477 | 5445 | if (flag_sanitize & SANITIZE_VLA |
5446 | && decl_context == NORMAL) | |
5447 | { | |
5448 | /* Evaluate the array size only once. */ | |
5449 | size = c_save_expr (size); | |
5450 | size = c_fully_fold (size, false, NULL); | |
5451 | size = fold_build2 (COMPOUND_EXPR, TREE_TYPE (size), | |
5452 | ubsan_instrument_vla (loc, size), | |
5453 | size); | |
5454 | } | |
231bd014 | 5455 | } |
51ef3909 | 5456 | |
a75b1c71 | 5457 | if (integer_zerop (size) && !this_size_varies) |
231bd014 | 5458 | { |
a0c938f0 | 5459 | /* A zero-length array cannot be represented with |
5460 | an unsigned index type, which is what we'll | |
5461 | get with build_index_type. Create an | |
5462 | open-ended range instead. */ | |
231bd014 | 5463 | itype = build_range_type (sizetype, size, NULL_TREE); |
5464 | } | |
5465 | else | |
5466 | { | |
4bf51001 | 5467 | /* Arrange for the SAVE_EXPR on the inside of the |
5468 | MINUS_EXPR, which allows the -1 to get folded | |
5469 | with the +1 that happens when building TYPE_SIZE. */ | |
5470 | if (size_varies) | |
4232a958 | 5471 | size = save_expr (size); |
a75b1c71 | 5472 | if (this_size_varies && TREE_CODE (size) == INTEGER_CST) |
5473 | size = build2 (COMPOUND_EXPR, TREE_TYPE (size), | |
5474 | integer_zero_node, size); | |
4bf51001 | 5475 | |
231bd014 | 5476 | /* Compute the maximum valid index, that is, size |
5477 | - 1. Do the calculation in index_type, so that | |
5478 | if it is a variable the computations will be | |
5479 | done in the proper mode. */ | |
389dd41b | 5480 | itype = fold_build2_loc (loc, MINUS_EXPR, index_type, |
5481 | convert (index_type, size), | |
5482 | convert (index_type, | |
5483 | size_one_node)); | |
231bd014 | 5484 | |
8f49133b | 5485 | /* The above overflows when size does not fit |
5486 | in index_type. | |
5487 | ??? While a size of INT_MAX+1 technically shouldn't | |
5488 | cause an overflow (because we subtract 1), handling | |
5489 | this case seems like an unnecessary complication. */ | |
5490 | if (TREE_CODE (size) == INTEGER_CST | |
5491 | && !int_fits_type_p (size, index_type)) | |
231bd014 | 5492 | { |
d1dd9ac0 | 5493 | if (name) |
e60a6f7b | 5494 | error_at (loc, "size of array %qE is too large", |
5495 | name); | |
d1dd9ac0 | 5496 | else |
e60a6f7b | 5497 | error_at (loc, "size of unnamed array is too large"); |
231bd014 | 5498 | type = error_mark_node; |
5499 | continue; | |
5500 | } | |
a0c938f0 | 5501 | |
231bd014 | 5502 | itype = build_index_type (itype); |
5503 | } | |
a75b1c71 | 5504 | if (this_size_varies) |
5505 | { | |
5506 | if (*expr) | |
5507 | *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size), | |
5508 | *expr, size); | |
5509 | else | |
5510 | *expr = size; | |
5511 | *expr_const_operands &= size_maybe_const; | |
5512 | } | |
231bd014 | 5513 | } |
5514 | else if (decl_context == FIELD) | |
5515 | { | |
0af147a4 | 5516 | bool flexible_array_member = false; |
51428eb1 | 5517 | if (array_parm_vla_unspec_p) |
5518 | /* Field names can in fact have function prototype | |
5519 | scope so [*] is disallowed here through making | |
5520 | the field variably modified, not through being | |
5521 | something other than a declaration with function | |
5522 | prototype scope. */ | |
b99f3c92 | 5523 | size_varies = true; |
0af147a4 | 5524 | else |
5525 | { | |
5526 | const struct c_declarator *t = declarator; | |
5527 | while (t->kind == cdk_attrs) | |
5528 | t = t->declarator; | |
5529 | flexible_array_member = (t->kind == cdk_id); | |
5530 | } | |
5531 | if (flexible_array_member | |
5532 | && pedantic && !flag_isoc99 && !in_system_header) | |
29438999 | 5533 | pedwarn (loc, OPT_Wpedantic, |
21ca8540 | 5534 | "ISO C90 does not support flexible array members"); |
fca37017 | 5535 | |
231bd014 | 5536 | /* ISO C99 Flexible array members are effectively |
5537 | identical to GCC's zero-length array extension. */ | |
0af147a4 | 5538 | if (flexible_array_member || array_parm_vla_unspec_p) |
5539 | itype = build_range_type (sizetype, size_zero_node, | |
5540 | NULL_TREE); | |
231bd014 | 5541 | } |
32d33ab2 | 5542 | else if (decl_context == PARM) |
5543 | { | |
5544 | if (array_parm_vla_unspec_p) | |
5545 | { | |
32d33ab2 | 5546 | itype = build_range_type (sizetype, size_zero_node, NULL_TREE); |
b99f3c92 | 5547 | size_varies = true; |
32d33ab2 | 5548 | } |
5549 | } | |
ce675af0 | 5550 | else if (decl_context == TYPENAME) |
5551 | { | |
5552 | if (array_parm_vla_unspec_p) | |
5553 | { | |
51428eb1 | 5554 | /* C99 6.7.5.2p4 */ |
5555 | warning (0, "%<[*]%> not in a declaration"); | |
5556 | /* We use this to avoid messing up with incomplete | |
5557 | array types of the same type, that would | |
5558 | otherwise be modified below. */ | |
ce675af0 | 5559 | itype = build_range_type (sizetype, size_zero_node, |
5560 | NULL_TREE); | |
b99f3c92 | 5561 | size_varies = true; |
ce675af0 | 5562 | } |
5563 | } | |
51ef3909 | 5564 | |
5568b3c6 | 5565 | /* Complain about arrays of incomplete types. */ |
b765c734 | 5566 | if (!COMPLETE_TYPE_P (type)) |
5567 | { | |
e60a6f7b | 5568 | error_at (loc, "array type has incomplete element type"); |
a0c938f0 | 5569 | type = error_mark_node; |
b765c734 | 5570 | } |
5571 | else | |
ce675af0 | 5572 | /* When itype is NULL, a shared incomplete array type is |
5573 | returned for all array of a given type. Elsewhere we | |
5574 | make sure we don't complete that type before copying | |
5575 | it, but here we want to make sure we don't ever | |
5576 | modify the shared type, so we gcc_assert (itype) | |
5577 | below. */ | |
6d5d708e | 5578 | { |
5579 | addr_space_t as = DECODE_QUAL_ADDR_SPACE (type_quals); | |
5580 | if (!ADDR_SPACE_GENERIC_P (as) && as != TYPE_ADDR_SPACE (type)) | |
5581 | type = build_qualified_type (type, | |
5582 | ENCODE_QUAL_ADDR_SPACE (as)); | |
5583 | ||
5584 | type = build_array_type (type, itype); | |
5585 | } | |
51ef3909 | 5586 | |
4dc955c8 | 5587 | if (type != error_mark_node) |
231bd014 | 5588 | { |
4dc955c8 | 5589 | if (size_varies) |
dc95eae2 | 5590 | { |
ce675af0 | 5591 | /* It is ok to modify type here even if itype is |
5592 | NULL: if size_varies, we're in a | |
a8b99ef6 | 5593 | multi-dimensional array and the inner type has |
ce675af0 | 5594 | variable size, so the enclosing shared array type |
5595 | must too. */ | |
dc95eae2 | 5596 | if (size && TREE_CODE (size) == INTEGER_CST) |
5597 | type | |
5598 | = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); | |
5599 | C_TYPE_VARIABLE_SIZE (type) = 1; | |
5600 | } | |
4dc955c8 | 5601 | |
5602 | /* The GCC extension for zero-length arrays differs from | |
5603 | ISO flexible array members in that sizeof yields | |
5604 | zero. */ | |
5605 | if (size && integer_zerop (size)) | |
5606 | { | |
ce675af0 | 5607 | gcc_assert (itype); |
b78aa367 | 5608 | type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); |
4dc955c8 | 5609 | TYPE_SIZE (type) = bitsize_zero_node; |
5610 | TYPE_SIZE_UNIT (type) = size_zero_node; | |
f54ef8b6 | 5611 | SET_TYPE_STRUCTURAL_EQUALITY (type); |
4dc955c8 | 5612 | } |
32d33ab2 | 5613 | if (array_parm_vla_unspec_p) |
5614 | { | |
ce675af0 | 5615 | gcc_assert (itype); |
32d33ab2 | 5616 | /* The type is complete. C99 6.7.5.2p4 */ |
b78aa367 | 5617 | type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); |
32d33ab2 | 5618 | TYPE_SIZE (type) = bitsize_zero_node; |
5619 | TYPE_SIZE_UNIT (type) = size_zero_node; | |
f54ef8b6 | 5620 | SET_TYPE_STRUCTURAL_EQUALITY (type); |
32d33ab2 | 5621 | } |
231bd014 | 5622 | } |
51ef3909 | 5623 | |
231bd014 | 5624 | if (decl_context != PARM |
bb476216 | 5625 | && (array_ptr_quals != TYPE_UNQUALIFIED |
5626 | || array_ptr_attrs != NULL_TREE | |
5627 | || array_parm_static)) | |
231bd014 | 5628 | { |
e60a6f7b | 5629 | error_at (loc, "static or type qualifiers in non-parameter array declarator"); |
bb476216 | 5630 | array_ptr_quals = TYPE_UNQUALIFIED; |
5631 | array_ptr_attrs = NULL_TREE; | |
231bd014 | 5632 | array_parm_static = 0; |
5633 | } | |
5634 | break; | |
5635 | } | |
ac206aff | 5636 | case cdk_function: |
231bd014 | 5637 | { |
5638 | /* Say it's a definition only for the declarator closest | |
5639 | to the identifier, apart possibly from some | |
5640 | attributes. */ | |
5641 | bool really_funcdef = false; | |
5642 | tree arg_types; | |
5643 | if (funcdef_flag) | |
5644 | { | |
ac206aff | 5645 | const struct c_declarator *t = declarator->declarator; |
5646 | while (t->kind == cdk_attrs) | |
5647 | t = t->declarator; | |
5648 | really_funcdef = (t->kind == cdk_id); | |
231bd014 | 5649 | } |
51ef3909 | 5650 | |
231bd014 | 5651 | /* Declaring a function type. Make sure we have a valid |
5652 | type for the function to return. */ | |
5653 | if (type == error_mark_node) | |
5654 | continue; | |
a0c938f0 | 5655 | |
b99f3c92 | 5656 | size_varies = false; |
51ef3909 | 5657 | |
231bd014 | 5658 | /* Warn about some types functions can't return. */ |
5659 | if (TREE_CODE (type) == FUNCTION_TYPE) | |
5660 | { | |
d1dd9ac0 | 5661 | if (name) |
e60a6f7b | 5662 | error_at (loc, "%qE declared as function returning a " |
5663 | "function", name); | |
d1dd9ac0 | 5664 | else |
e60a6f7b | 5665 | error_at (loc, "type name declared as function " |
5666 | "returning a function"); | |
231bd014 | 5667 | type = integer_type_node; |
5668 | } | |
5669 | if (TREE_CODE (type) == ARRAY_TYPE) | |
5670 | { | |
d1dd9ac0 | 5671 | if (name) |
e60a6f7b | 5672 | error_at (loc, "%qE declared as function returning an array", |
5673 | name); | |
d1dd9ac0 | 5674 | else |
e60a6f7b | 5675 | error_at (loc, "type name declared as function returning " |
5676 | "an array"); | |
231bd014 | 5677 | type = integer_type_node; |
5678 | } | |
2b3c93a3 | 5679 | errmsg = targetm.invalid_return_type (type); |
5680 | if (errmsg) | |
5681 | { | |
5682 | error (errmsg); | |
5683 | type = integer_type_node; | |
5684 | } | |
51ef3909 | 5685 | |
231bd014 | 5686 | /* Construct the function type and go to the next |
5687 | inner layer of declarator. */ | |
ac206aff | 5688 | arg_info = declarator->u.arg_info; |
231bd014 | 5689 | arg_types = grokparms (arg_info, really_funcdef); |
51ef3909 | 5690 | |
231bd014 | 5691 | /* Type qualifiers before the return type of the function |
5692 | qualify the return type, not the function type. */ | |
5693 | if (type_quals) | |
5694 | { | |
a0c938f0 | 5695 | /* Type qualifiers on a function return type are |
231bd014 | 5696 | normally permitted by the standard but have no |
5697 | effect, so give a warning at -Wreturn-type. | |
5698 | Qualifiers on a void return type are banned on | |
5699 | function definitions in ISO C; GCC used to used | |
5700 | them for noreturn functions. */ | |
5701 | if (VOID_TYPE_P (type) && really_funcdef) | |
e60a6f7b | 5702 | pedwarn (loc, 0, |
21ca8540 | 5703 | "function definition has qualified void return type"); |
8b6866af | 5704 | else |
e60a6f7b | 5705 | warning_at (loc, OPT_Wignored_qualifiers, |
8b6866af | 5706 | "type qualifiers ignored on function return type"); |
a0c938f0 | 5707 | |
231bd014 | 5708 | type = c_build_qualified_type (type, type_quals); |
5709 | } | |
5710 | type_quals = TYPE_UNQUALIFIED; | |
a0c938f0 | 5711 | |
231bd014 | 5712 | type = build_function_type (type, arg_types); |
ac206aff | 5713 | declarator = declarator->declarator; |
a0c938f0 | 5714 | |
231bd014 | 5715 | /* Set the TYPE_CONTEXTs for each tagged type which is local to |
5716 | the formal parameter list of this FUNCTION_TYPE to point to | |
5717 | the FUNCTION_TYPE node itself. */ | |
613f2a35 | 5718 | { |
9d61f04b | 5719 | c_arg_tag *tag; |
5720 | unsigned ix; | |
a0c938f0 | 5721 | |
f1f41a6c | 5722 | FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag) |
9d61f04b | 5723 | TYPE_CONTEXT (tag->type) = type; |
613f2a35 | 5724 | } |
231bd014 | 5725 | break; |
5726 | } | |
ac206aff | 5727 | case cdk_pointer: |
51ef3909 | 5728 | { |
231bd014 | 5729 | /* Merge any constancy or volatility into the target type |
5730 | for the pointer. */ | |
b560fabd | 5731 | if ((type_quals & TYPE_QUAL_ATOMIC) |
5732 | && TREE_CODE (type) == FUNCTION_TYPE) | |
5733 | { | |
5734 | error_at (loc, | |
5735 | "%<_Atomic%>-qualified function type"); | |
5736 | type_quals &= ~TYPE_QUAL_ATOMIC; | |
5737 | } | |
5738 | else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE | |
5739 | && type_quals) | |
29438999 | 5740 | pedwarn (loc, OPT_Wpedantic, |
21ca8540 | 5741 | "ISO C forbids qualified function types"); |
231bd014 | 5742 | if (type_quals) |
5743 | type = c_build_qualified_type (type, type_quals); | |
b99f3c92 | 5744 | size_varies = false; |
bb476216 | 5745 | |
6e8435a1 | 5746 | /* When the pointed-to type involves components of variable size, |
5747 | care must be taken to ensure that the size evaluation code is | |
5748 | emitted early enough to dominate all the possible later uses | |
5749 | and late enough for the variables on which it depends to have | |
5750 | been assigned. | |
5751 | ||
5752 | This is expected to happen automatically when the pointed-to | |
5753 | type has a name/declaration of it's own, but special attention | |
5754 | is required if the type is anonymous. | |
5755 | ||
5756 | We handle the NORMAL and FIELD contexts here by attaching an | |
5757 | artificial TYPE_DECL to such pointed-to type. This forces the | |
5758 | sizes evaluation at a safe point and ensures it is not deferred | |
5759 | until e.g. within a deeper conditional context. | |
5760 | ||
5761 | We expect nothing to be needed here for PARM or TYPENAME. | |
5762 | Pushing a TYPE_DECL at this point for TYPENAME would actually | |
5763 | be incorrect, as we might be in the middle of an expression | |
5764 | with side effects on the pointed-to type size "arguments" prior | |
5765 | to the pointer declaration point and the fake TYPE_DECL in the | |
5766 | enclosing context would force the size evaluation prior to the | |
5767 | side effects. */ | |
5768 | ||
5769 | if (!TYPE_NAME (type) | |
5770 | && (decl_context == NORMAL || decl_context == FIELD) | |
5771 | && variably_modified_type_p (type, NULL_TREE)) | |
5772 | { | |
e60a6f7b | 5773 | tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type); |
6e8435a1 | 5774 | DECL_ARTIFICIAL (decl) = 1; |
5775 | pushdecl (decl); | |
e60a6f7b | 5776 | finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE); |
6e8435a1 | 5777 | TYPE_NAME (type) = decl; |
5778 | } | |
5779 | ||
7714837c | 5780 | type = c_build_pointer_type (type); |
a0c938f0 | 5781 | |
9553111d | 5782 | /* Process type qualifiers (such as const or volatile) |
5783 | that were given inside the `*'. */ | |
bb476216 | 5784 | type_quals = declarator->u.pointer_quals; |
9553111d | 5785 | |
ac206aff | 5786 | declarator = declarator->declarator; |
231bd014 | 5787 | break; |
51ef3909 | 5788 | } |
231bd014 | 5789 | default: |
5790 | gcc_unreachable (); | |
51ef3909 | 5791 | } |
51ef3909 | 5792 | } |
e47ffaae | 5793 | *decl_attrs = chainon (returned_attrs, *decl_attrs); |
51ef3909 | 5794 | |
aebc8537 | 5795 | /* Now TYPE has the actual type, apart from any qualifiers in |
5796 | TYPE_QUALS. */ | |
51ef3909 | 5797 | |
6d5d708e | 5798 | /* Warn about address space used for things other than static memory or |
5799 | pointers. */ | |
5800 | address_space = DECODE_QUAL_ADDR_SPACE (type_quals); | |
5801 | if (!ADDR_SPACE_GENERIC_P (address_space)) | |
5802 | { | |
5803 | if (decl_context == NORMAL) | |
5804 | { | |
5805 | switch (storage_class) | |
5806 | { | |
5807 | case csc_auto: | |
5808 | error ("%qs combined with %<auto%> qualifier for %qE", | |
5809 | c_addr_space_name (address_space), name); | |
5810 | break; | |
5811 | case csc_register: | |
5812 | error ("%qs combined with %<register%> qualifier for %qE", | |
5813 | c_addr_space_name (address_space), name); | |
5814 | break; | |
5815 | case csc_none: | |
5816 | if (current_function_scope) | |
5817 | { | |
5818 | error ("%qs specified for auto variable %qE", | |
5819 | c_addr_space_name (address_space), name); | |
5820 | break; | |
5821 | } | |
5822 | break; | |
5823 | case csc_static: | |
5824 | case csc_extern: | |
5825 | case csc_typedef: | |
5826 | break; | |
5827 | default: | |
5828 | gcc_unreachable (); | |
5829 | } | |
5830 | } | |
5831 | else if (decl_context == PARM && TREE_CODE (type) != ARRAY_TYPE) | |
5832 | { | |
5833 | if (name) | |
5834 | error ("%qs specified for parameter %qE", | |
5835 | c_addr_space_name (address_space), name); | |
5836 | else | |
5837 | error ("%qs specified for unnamed parameter", | |
5838 | c_addr_space_name (address_space)); | |
5839 | } | |
5840 | else if (decl_context == FIELD) | |
5841 | { | |
5842 | if (name) | |
5843 | error ("%qs specified for structure field %qE", | |
5844 | c_addr_space_name (address_space), name); | |
5845 | else | |
5846 | error ("%qs specified for structure field", | |
5847 | c_addr_space_name (address_space)); | |
5848 | } | |
5849 | } | |
5850 | ||
8b54bce6 | 5851 | /* Check the type and width of a bit-field. */ |
5852 | if (bitfield) | |
b560fabd | 5853 | { |
5854 | check_bitfield_type_and_width (&type, width, name); | |
5855 | /* C11 makes it implementation-defined (6.7.2.1#5) whether | |
5856 | atomic types are permitted for bit-fields; we have no code to | |
5857 | make bit-field accesses atomic, so disallow them. */ | |
5858 | if (type_quals & TYPE_QUAL_ATOMIC) | |
5859 | { | |
5860 | if (name) | |
5861 | error ("bit-field %qE has atomic type", name); | |
5862 | else | |
5863 | error ("bit-field has atomic type"); | |
5864 | type_quals &= ~TYPE_QUAL_ATOMIC; | |
5865 | } | |
5866 | } | |
8b54bce6 | 5867 | |
83e25171 | 5868 | /* Reject invalid uses of _Alignas. */ |
5869 | if (declspecs->alignas_p) | |
5870 | { | |
5871 | if (storage_class == csc_typedef) | |
5872 | error_at (loc, "alignment specified for typedef %qE", name); | |
5873 | else if (storage_class == csc_register) | |
5874 | error_at (loc, "alignment specified for %<register%> object %qE", | |
5875 | name); | |
5876 | else if (decl_context == PARM) | |
5877 | { | |
5878 | if (name) | |
5879 | error_at (loc, "alignment specified for parameter %qE", name); | |
5880 | else | |
5881 | error_at (loc, "alignment specified for unnamed parameter"); | |
5882 | } | |
5883 | else if (bitfield) | |
5884 | { | |
5885 | if (name) | |
5886 | error_at (loc, "alignment specified for bit-field %qE", name); | |
5887 | else | |
5888 | error_at (loc, "alignment specified for unnamed bit-field"); | |
5889 | } | |
5890 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
5891 | error_at (loc, "alignment specified for function %qE", name); | |
5892 | else if (declspecs->align_log != -1) | |
5893 | { | |
5894 | alignas_align = 1U << declspecs->align_log; | |
5895 | if (alignas_align < TYPE_ALIGN_UNIT (type)) | |
5896 | { | |
5897 | if (name) | |
5898 | error_at (loc, "%<_Alignas%> specifiers cannot reduce " | |
5899 | "alignment of %qE", name); | |
5900 | else | |
5901 | error_at (loc, "%<_Alignas%> specifiers cannot reduce " | |
5902 | "alignment of unnamed field"); | |
5903 | alignas_align = 0; | |
5904 | } | |
5905 | } | |
5906 | } | |
5907 | ||
85d86b55 | 5908 | /* Did array size calculations overflow or does the array cover more |
5909 | than half of the address-space? */ | |
0dbd1c74 | 5910 | if (TREE_CODE (type) == ARRAY_TYPE |
4b72716d | 5911 | && COMPLETE_TYPE_P (type) |
c96dc3af | 5912 | && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST |
85d86b55 | 5913 | && ! valid_constant_size_p (TYPE_SIZE_UNIT (type))) |
a37bbfd1 | 5914 | { |
d1dd9ac0 | 5915 | if (name) |
e60a6f7b | 5916 | error_at (loc, "size of array %qE is too large", name); |
d1dd9ac0 | 5917 | else |
e60a6f7b | 5918 | error_at (loc, "size of unnamed array is too large"); |
734c98be | 5919 | /* If we proceed with the array type as it is, we'll eventually |
08f817b3 | 5920 | crash in tree_to_[su]hwi(). */ |
a37bbfd1 | 5921 | type = error_mark_node; |
5922 | } | |
0dbd1c74 | 5923 | |
51ef3909 | 5924 | /* If this is declaring a typedef name, return a TYPE_DECL. */ |
5925 | ||
feb04535 | 5926 | if (storage_class == csc_typedef) |
51ef3909 | 5927 | { |
5928 | tree decl; | |
b560fabd | 5929 | if ((type_quals & TYPE_QUAL_ATOMIC) |
5930 | && TREE_CODE (type) == FUNCTION_TYPE) | |
5931 | { | |
5932 | error_at (loc, | |
5933 | "%<_Atomic%>-qualified function type"); | |
5934 | type_quals &= ~TYPE_QUAL_ATOMIC; | |
5935 | } | |
5936 | else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE | |
5937 | && type_quals) | |
29438999 | 5938 | pedwarn (loc, OPT_Wpedantic, |
21ca8540 | 5939 | "ISO C forbids qualified function types"); |
a5b1863e | 5940 | if (type_quals) |
5941 | type = c_build_qualified_type (type, type_quals); | |
e60a6f7b | 5942 | decl = build_decl (declarator->id_loc, |
5943 | TYPE_DECL, declarator->u.id, type); | |
70dd11f7 | 5944 | if (declspecs->explicit_signed_p) |
51ef3909 | 5945 | C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1; |
ebdbd341 | 5946 | if (declspecs->inline_p) |
e60a6f7b | 5947 | pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl); |
985c6e3a | 5948 | if (declspecs->noreturn_p) |
5949 | pedwarn (loc, 0,"typedef %q+D declared %<_Noreturn%>", decl); | |
26dbec0a | 5950 | |
5951 | if (warn_cxx_compat && declarator->u.id != NULL_TREE) | |
5952 | { | |
5953 | struct c_binding *b = I_TAG_BINDING (declarator->u.id); | |
5954 | ||
5955 | if (b != NULL | |
5956 | && b->decl != NULL_TREE | |
5957 | && (B_IN_CURRENT_SCOPE (b) | |
5958 | || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b))) | |
5959 | && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type)) | |
5960 | { | |
5961 | warning_at (declarator->id_loc, OPT_Wc___compat, | |
5962 | ("using %qD as both a typedef and a tag is " | |
5963 | "invalid in C++"), | |
5964 | decl); | |
5965 | if (b->locus != UNKNOWN_LOCATION) | |
5966 | inform (b->locus, "originally defined here"); | |
5967 | } | |
5968 | } | |
5969 | ||
51ef3909 | 5970 | return decl; |
5971 | } | |
5972 | ||
51ef3909 | 5973 | /* If this is a type name (such as, in a cast or sizeof), |
5974 | compute the type and return it now. */ | |
5975 | ||
5976 | if (decl_context == TYPENAME) | |
5977 | { | |
ebdbd341 | 5978 | /* Note that the grammar rejects storage classes in typenames |
5979 | and fields. */ | |
5980 | gcc_assert (storage_class == csc_none && !threadp | |
985c6e3a | 5981 | && !declspecs->inline_p && !declspecs->noreturn_p); |
b560fabd | 5982 | if ((type_quals & TYPE_QUAL_ATOMIC) |
5983 | && TREE_CODE (type) == FUNCTION_TYPE) | |
5984 | { | |
5985 | error_at (loc, | |
5986 | "%<_Atomic%>-qualified function type"); | |
5987 | type_quals &= ~TYPE_QUAL_ATOMIC; | |
5988 | } | |
5989 | else if (pedantic && TREE_CODE (type) == FUNCTION_TYPE | |
5990 | && type_quals) | |
29438999 | 5991 | pedwarn (loc, OPT_Wpedantic, |
21ca8540 | 5992 | "ISO C forbids const or volatile function types"); |
a5b1863e | 5993 | if (type_quals) |
5994 | type = c_build_qualified_type (type, type_quals); | |
51ef3909 | 5995 | return type; |
5996 | } | |
5997 | ||
32d33ab2 | 5998 | if (pedantic && decl_context == FIELD |
5999 | && variably_modified_type_p (type, NULL_TREE)) | |
6000 | { | |
6001 | /* C99 6.7.2.1p8 */ | |
29438999 | 6002 | pedwarn (loc, OPT_Wpedantic, "a member of a structure or union cannot " |
e60a6f7b | 6003 | "have a variably modified type"); |
32d33ab2 | 6004 | } |
6005 | ||
896f20c3 | 6006 | /* Aside from typedefs and type names (handle above), |
6007 | `void' at top level (not within pointer) | |
6008 | is allowed only in public variables. | |
51ef3909 | 6009 | We don't complain about parms either, but that is because |
6010 | a better error message can be made later. */ | |
6011 | ||
5c803577 | 6012 | if (VOID_TYPE_P (type) && decl_context != PARM |
84166705 | 6013 | && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE) |
feb04535 | 6014 | && (storage_class == csc_extern |
393b349a | 6015 | || (current_scope == file_scope |
feb04535 | 6016 | && !(storage_class == csc_static |
6017 | || storage_class == csc_register))))) | |
51ef3909 | 6018 | { |
e60a6f7b | 6019 | error_at (loc, "variable or field %qE declared void", name); |
51ef3909 | 6020 | type = integer_type_node; |
6021 | } | |
6022 | ||
6023 | /* Now create the decl, which may be a VAR_DECL, a PARM_DECL | |
6024 | or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */ | |
6025 | ||
6026 | { | |
e3c541f0 | 6027 | tree decl; |
51ef3909 | 6028 | |
6029 | if (decl_context == PARM) | |
6030 | { | |
e94026da | 6031 | tree promoted_type; |
51ef3909 | 6032 | |
6033 | /* A parameter declared as an array of T is really a pointer to T. | |
6034 | One declared as a function is really a pointer to a function. */ | |
6035 | ||
6036 | if (TREE_CODE (type) == ARRAY_TYPE) | |
6037 | { | |
6038 | /* Transfer const-ness of array into that of type pointed to. */ | |
c7b1c5d8 | 6039 | type = TREE_TYPE (type); |
a5b1863e | 6040 | if (type_quals) |
6041 | type = c_build_qualified_type (type, type_quals); | |
7714837c | 6042 | type = c_build_pointer_type (type); |
bb476216 | 6043 | type_quals = array_ptr_quals; |
eb52d13a | 6044 | if (type_quals) |
6045 | type = c_build_qualified_type (type, type_quals); | |
1fd94215 | 6046 | |
bb476216 | 6047 | /* We don't yet implement attributes in this context. */ |
6048 | if (array_ptr_attrs != NULL_TREE) | |
e60a6f7b | 6049 | warning_at (loc, OPT_Wattributes, |
6050 | "attributes in parameter array declarator ignored"); | |
1fd94215 | 6051 | |
b99f3c92 | 6052 | size_varies = false; |
51ef3909 | 6053 | } |
6054 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
6055 | { | |
b560fabd | 6056 | if (type_quals & TYPE_QUAL_ATOMIC) |
6057 | { | |
6058 | error_at (loc, | |
6059 | "%<_Atomic%>-qualified function type"); | |
6060 | type_quals &= ~TYPE_QUAL_ATOMIC; | |
6061 | } | |
6062 | else if (type_quals) | |
29438999 | 6063 | pedwarn (loc, OPT_Wpedantic, |
21ca8540 | 6064 | "ISO C forbids qualified function types"); |
a5b1863e | 6065 | if (type_quals) |
6066 | type = c_build_qualified_type (type, type_quals); | |
7714837c | 6067 | type = c_build_pointer_type (type); |
a5b1863e | 6068 | type_quals = TYPE_UNQUALIFIED; |
51ef3909 | 6069 | } |
7c772c9a | 6070 | else if (type_quals) |
6071 | type = c_build_qualified_type (type, type_quals); | |
1cae46be | 6072 | |
e60a6f7b | 6073 | decl = build_decl (declarator->id_loc, |
6074 | PARM_DECL, declarator->u.id, type); | |
08f8d953 | 6075 | if (size_varies) |
51ef3909 | 6076 | C_DECL_VARIABLE_SIZE (decl) = 1; |
6077 | ||
6078 | /* Compute the type actually passed in the parmlist, | |
6079 | for the case where there is no prototype. | |
6080 | (For example, shorts and chars are passed as ints.) | |
6081 | When there is a prototype, this is overridden later. */ | |
6082 | ||
e94026da | 6083 | if (type == error_mark_node) |
6084 | promoted_type = type; | |
6085 | else | |
63c62881 | 6086 | promoted_type = c_type_promotes_to (type); |
51ef3909 | 6087 | |
e94026da | 6088 | DECL_ARG_TYPE (decl) = promoted_type; |
ebdbd341 | 6089 | if (declspecs->inline_p) |
e60a6f7b | 6090 | pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl); |
985c6e3a | 6091 | if (declspecs->noreturn_p) |
6092 | pedwarn (loc, 0, "parameter %q+D declared %<_Noreturn%>", decl); | |
51ef3909 | 6093 | } |
6094 | else if (decl_context == FIELD) | |
6095 | { | |
ebdbd341 | 6096 | /* Note that the grammar rejects storage classes in typenames |
6097 | and fields. */ | |
6098 | gcc_assert (storage_class == csc_none && !threadp | |
985c6e3a | 6099 | && !declspecs->inline_p && !declspecs->noreturn_p); |
ebdbd341 | 6100 | |
51ef3909 | 6101 | /* Structure field. It may not be a function. */ |
b9d8dcc9 | 6102 | |
51ef3909 | 6103 | if (TREE_CODE (type) == FUNCTION_TYPE) |
6104 | { | |
e60a6f7b | 6105 | error_at (loc, "field %qE declared as a function", name); |
51ef3909 | 6106 | type = build_pointer_type (type); |
6107 | } | |
4b72716d | 6108 | else if (TREE_CODE (type) != ERROR_MARK |
a0c938f0 | 6109 | && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type)) |
51ef3909 | 6110 | { |
7f824b22 | 6111 | if (name) |
e60a6f7b | 6112 | error_at (loc, "field %qE has incomplete type", name); |
7f824b22 | 6113 | else |
e60a6f7b | 6114 | error_at (loc, "unnamed field has incomplete type"); |
51ef3909 | 6115 | type = error_mark_node; |
6116 | } | |
aebc8537 | 6117 | type = c_build_qualified_type (type, type_quals); |
e60a6f7b | 6118 | decl = build_decl (declarator->id_loc, |
6119 | FIELD_DECL, declarator->u.id, type); | |
851dfbff | 6120 | DECL_NONADDRESSABLE_P (decl) = bitfield; |
78ba9fed | 6121 | if (bitfield && !declarator->u.id) |
6122 | TREE_NO_WARNING (decl) = 1; | |
851dfbff | 6123 | |
08f8d953 | 6124 | if (size_varies) |
51ef3909 | 6125 | C_DECL_VARIABLE_SIZE (decl) = 1; |
6126 | } | |
6127 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
6128 | { | |
feb04535 | 6129 | if (storage_class == csc_register || threadp) |
91d51df3 | 6130 | { |
e60a6f7b | 6131 | error_at (loc, "invalid storage class for function %qE", name); |
5568b3c6 | 6132 | } |
72394149 | 6133 | else if (current_scope != file_scope) |
6134 | { | |
6135 | /* Function declaration not at file scope. Storage | |
6136 | classes other than `extern' are not allowed, C99 | |
6137 | 6.7.1p5, and `extern' makes no difference. However, | |
6138 | GCC allows 'auto', perhaps with 'inline', to support | |
6139 | nested functions. */ | |
feb04535 | 6140 | if (storage_class == csc_auto) |
29438999 | 6141 | pedwarn (loc, OPT_Wpedantic, |
d1dd9ac0 | 6142 | "invalid storage class for function %qE", name); |
61ba37bf | 6143 | else if (storage_class == csc_static) |
91d51df3 | 6144 | { |
e60a6f7b | 6145 | error_at (loc, "invalid storage class for function %qE", name); |
a0c938f0 | 6146 | if (funcdef_flag) |
61ba37bf | 6147 | storage_class = declspecs->storage_class = csc_none; |
6148 | else | |
6149 | return 0; | |
91d51df3 | 6150 | } |
72394149 | 6151 | } |
b3319231 | 6152 | |
e60a6f7b | 6153 | decl = build_decl (declarator->id_loc, |
6154 | FUNCTION_DECL, declarator->u.id, type); | |
61ba37bf | 6155 | decl = build_decl_attribute_variant (decl, decl_attr); |
6156 | ||
b560fabd | 6157 | if (type_quals & TYPE_QUAL_ATOMIC) |
6158 | { | |
6159 | error_at (loc, | |
6160 | "%<_Atomic%>-qualified function type"); | |
6161 | type_quals &= ~TYPE_QUAL_ATOMIC; | |
6162 | } | |
6163 | else if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl)) | |
29438999 | 6164 | pedwarn (loc, OPT_Wpedantic, |
8864917d | 6165 | "ISO C forbids qualified function types"); |
51ef3909 | 6166 | |
b3e83e1e | 6167 | /* Every function declaration is an external reference |
6168 | (DECL_EXTERNAL) except for those which are not at file | |
6169 | scope and are explicitly declared "auto". This is | |
6170 | forbidden by standard C (C99 6.7.1p5) and is interpreted by | |
6171 | GCC to signify a forward declaration of a nested function. */ | |
feb04535 | 6172 | if (storage_class == csc_auto && current_scope != file_scope) |
b3e83e1e | 6173 | DECL_EXTERNAL (decl) = 0; |
c42cc79e | 6174 | /* In C99, a function which is declared 'inline' with 'extern' |
6175 | is not an external reference (which is confusing). It | |
6176 | means that the later definition of the function must be output | |
6177 | in this file, C99 6.7.4p6. In GNU C89, a function declared | |
6178 | 'extern inline' is an external reference. */ | |
6179 | else if (declspecs->inline_p && storage_class != csc_static) | |
11950bdd | 6180 | DECL_EXTERNAL (decl) = ((storage_class == csc_extern) |
6181 | == flag_gnu89_inline); | |
b3e83e1e | 6182 | else |
c42cc79e | 6183 | DECL_EXTERNAL (decl) = !initialized; |
491e04ef | 6184 | |
51ef3909 | 6185 | /* Record absence of global scope for `static' or `auto'. */ |
6186 | TREE_PUBLIC (decl) | |
feb04535 | 6187 | = !(storage_class == csc_static || storage_class == csc_auto); |
dcde0ff5 | 6188 | |
a89ce285 | 6189 | /* For a function definition, record the argument information |
731e6cbf | 6190 | block where store_parm_decls will look for it. */ |
a89ce285 | 6191 | if (funcdef_flag) |
731e6cbf | 6192 | current_function_arg_info = arg_info; |
a89ce285 | 6193 | |
70dd11f7 | 6194 | if (declspecs->default_int_p) |
af857942 | 6195 | C_FUNCTION_IMPLICIT_INT (decl) = 1; |
6196 | ||
985c6e3a | 6197 | /* Record presence of `inline' and `_Noreturn', if it is |
6198 | reasonable. */ | |
ebdbd341 | 6199 | if (flag_hosted && MAIN_NAME_P (declarator->u.id)) |
51ef3909 | 6200 | { |
feb04535 | 6201 | if (declspecs->inline_p) |
e60a6f7b | 6202 | pedwarn (loc, 0, "cannot inline function %<main%>"); |
985c6e3a | 6203 | if (declspecs->noreturn_p) |
6204 | pedwarn (loc, 0, "%<main%> declared %<_Noreturn%>"); | |
6205 | } | |
6206 | else | |
6207 | { | |
6208 | if (declspecs->inline_p) | |
6209 | /* Record that the function is declared `inline'. */ | |
6210 | DECL_DECLARED_INLINE_P (decl) = 1; | |
6211 | if (declspecs->noreturn_p) | |
4755ceab | 6212 | { |
32074525 | 6213 | if (!flag_isoc11) |
4755ceab | 6214 | { |
6215 | if (flag_isoc99) | |
29438999 | 6216 | pedwarn (loc, OPT_Wpedantic, |
4755ceab | 6217 | "ISO C99 does not support %<_Noreturn%>"); |
6218 | else | |
29438999 | 6219 | pedwarn (loc, OPT_Wpedantic, |
4755ceab | 6220 | "ISO C90 does not support %<_Noreturn%>"); |
6221 | } | |
6222 | TREE_THIS_VOLATILE (decl) = 1; | |
6223 | } | |
3b288406 | 6224 | } |
51ef3909 | 6225 | } |
6226 | else | |
6227 | { | |
6228 | /* It's a variable. */ | |
b3319231 | 6229 | /* An uninitialized decl with `extern' is a reference. */ |
feb04535 | 6230 | int extern_ref = !initialized && storage_class == csc_extern; |
51ef3909 | 6231 | |
aebc8537 | 6232 | type = c_build_qualified_type (type, type_quals); |
c2621053 | 6233 | |
393b349a | 6234 | /* C99 6.2.2p7: It is invalid (compile-time undefined |
6235 | behavior) to create an 'extern' declaration for a | |
c2621053 | 6236 | variable if there is a global declaration that is |
393b349a | 6237 | 'static' and the global declaration is not visible. |
6238 | (If the static declaration _is_ currently visible, | |
6239 | the 'extern' declaration is taken to refer to that decl.) */ | |
6240 | if (extern_ref && current_scope != file_scope) | |
c2621053 | 6241 | { |
ac206aff | 6242 | tree global_decl = identifier_global_value (declarator->u.id); |
6243 | tree visible_decl = lookup_name (declarator->u.id); | |
c2621053 | 6244 | |
1cae46be | 6245 | if (global_decl |
393b349a | 6246 | && global_decl != visible_decl |
c2621053 | 6247 | && TREE_CODE (global_decl) == VAR_DECL |
6248 | && !TREE_PUBLIC (global_decl)) | |
e60a6f7b | 6249 | error_at (loc, "variable previously declared %<static%> " |
6250 | "redeclared %<extern%>"); | |
c2621053 | 6251 | } |
6252 | ||
e60a6f7b | 6253 | decl = build_decl (declarator->id_loc, |
6254 | VAR_DECL, declarator->u.id, type); | |
08f8d953 | 6255 | if (size_varies) |
51ef3909 | 6256 | C_DECL_VARIABLE_SIZE (decl) = 1; |
6257 | ||
feb04535 | 6258 | if (declspecs->inline_p) |
e60a6f7b | 6259 | pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl); |
985c6e3a | 6260 | if (declspecs->noreturn_p) |
6261 | pedwarn (loc, 0, "variable %q+D declared %<_Noreturn%>", decl); | |
51ef3909 | 6262 | |
8dfad60e | 6263 | /* At file scope, an initialized extern declaration may follow |
6264 | a static declaration. In that case, DECL_EXTERNAL will be | |
6265 | reset later in start_decl. */ | |
feb04535 | 6266 | DECL_EXTERNAL (decl) = (storage_class == csc_extern); |
2a6f0f81 | 6267 | |
6e899616 | 6268 | /* At file scope, the presence of a `static' or `register' storage |
76665aeb | 6269 | class specifier, or the absence of all storage class specifiers |
6270 | makes this declaration a definition (perhaps tentative). Also, | |
23bf35fe | 6271 | the absence of `static' makes it public. */ |
393b349a | 6272 | if (current_scope == file_scope) |
51ef3909 | 6273 | { |
23bf35fe | 6274 | TREE_PUBLIC (decl) = storage_class != csc_static; |
2a6f0f81 | 6275 | TREE_STATIC (decl) = !extern_ref; |
51ef3909 | 6276 | } |
6e899616 | 6277 | /* Not at file scope, only `static' makes a static definition. */ |
51ef3909 | 6278 | else |
6279 | { | |
feb04535 | 6280 | TREE_STATIC (decl) = (storage_class == csc_static); |
2a6f0f81 | 6281 | TREE_PUBLIC (decl) = extern_ref; |
6282 | } | |
6283 | ||
feb04535 | 6284 | if (threadp) |
9dda1f80 | 6285 | DECL_TLS_MODEL (decl) = decl_default_tls_model (decl); |
51ef3909 | 6286 | } |
6287 | ||
1d9b9611 | 6288 | if ((storage_class == csc_extern |
6289 | || (storage_class == csc_none | |
6290 | && TREE_CODE (type) == FUNCTION_TYPE | |
6291 | && !funcdef_flag)) | |
32d33ab2 | 6292 | && variably_modified_type_p (type, NULL_TREE)) |
6293 | { | |
6294 | /* C99 6.7.5.2p2 */ | |
1d9b9611 | 6295 | if (TREE_CODE (type) == FUNCTION_TYPE) |
e60a6f7b | 6296 | error_at (loc, "non-nested function with variably modified type"); |
1d9b9611 | 6297 | else |
e60a6f7b | 6298 | error_at (loc, "object with variably modified type must have " |
6299 | "no linkage"); | |
32d33ab2 | 6300 | } |
6301 | ||
51ef3909 | 6302 | /* Record `register' declaration for warnings on & |
6303 | and in case doing stupid register allocation. */ | |
6304 | ||
feb04535 | 6305 | if (storage_class == csc_register) |
7746224a | 6306 | { |
6307 | C_DECL_REGISTER (decl) = 1; | |
6308 | DECL_REGISTER (decl) = 1; | |
6309 | } | |
51ef3909 | 6310 | |
6311 | /* Record constancy and volatility. */ | |
a5b1863e | 6312 | c_apply_type_quals_to_decl (type_quals, decl); |
51ef3909 | 6313 | |
83e25171 | 6314 | /* Apply _Alignas specifiers. */ |
6315 | if (alignas_align) | |
6316 | { | |
6317 | DECL_ALIGN (decl) = alignas_align * BITS_PER_UNIT; | |
6318 | DECL_USER_ALIGN (decl) = 1; | |
6319 | } | |
6320 | ||
51ef3909 | 6321 | /* If a type has volatile components, it should be stored in memory. |
6322 | Otherwise, the fact that those components are volatile | |
5ded8c6f | 6323 | will be ignored, and would even crash the compiler. |
6324 | Of course, this only makes sense on VAR,PARM, and RESULT decl's. */ | |
6325 | if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)) | |
6326 | && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL | |
6327 | || TREE_CODE (decl) == RESULT_DECL)) | |
7746224a | 6328 | { |
6329 | /* It is not an error for a structure with volatile fields to | |
6330 | be declared register, but reset DECL_REGISTER since it | |
6331 | cannot actually go in a register. */ | |
6332 | int was_reg = C_DECL_REGISTER (decl); | |
6333 | C_DECL_REGISTER (decl) = 0; | |
6334 | DECL_REGISTER (decl) = 0; | |
6335 | c_mark_addressable (decl); | |
6336 | C_DECL_REGISTER (decl) = was_reg; | |
6337 | } | |
51ef3909 | 6338 | |
418089c3 | 6339 | /* This is the earliest point at which we might know the assembler |
6340 | name of a variable. Thus, if it's known before this, die horribly. */ | |
231bd014 | 6341 | gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl)); |
418089c3 | 6342 | |
4a76ab2a | 6343 | if (warn_cxx_compat |
6344 | && TREE_CODE (decl) == VAR_DECL | |
6345 | && TREE_PUBLIC (decl) | |
6346 | && TREE_STATIC (decl) | |
6347 | && (TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE | |
6348 | || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE | |
6349 | || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE) | |
6350 | && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE) | |
6351 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat, | |
6352 | ("non-local variable %qD with anonymous type is " | |
6353 | "questionable in C++"), | |
6354 | decl); | |
6355 | ||
51ef3909 | 6356 | return decl; |
6357 | } | |
6358 | } | |
6359 | \f | |
51ef3909 | 6360 | /* Decode the parameter-list info for a function type or function definition. |
32d33ab2 | 6361 | The argument is the value returned by `get_parm_info' (or made in c-parse.c |
51ef3909 | 6362 | if there is an identifier list instead of a parameter decl list). |
6363 | These two functions are separate because when a function returns | |
6364 | or receives functions then each is called multiple times but the order | |
6365 | of calls is different. The last call to `grokparms' is always the one | |
6366 | that contains the formal parameter names of a function definition. | |
6367 | ||
51ef3909 | 6368 | Return a list of arg types to use in the FUNCTION_TYPE for this function. |
6369 | ||
4a125bfc | 6370 | FUNCDEF_FLAG is true for a function definition, false for |
51ef3909 | 6371 | a mere declaration. A nonempty identifier-list gets an error message |
4a125bfc | 6372 | when FUNCDEF_FLAG is false. */ |
51ef3909 | 6373 | |
6374 | static tree | |
ac206aff | 6375 | grokparms (struct c_arg_info *arg_info, bool funcdef_flag) |
51ef3909 | 6376 | { |
ac206aff | 6377 | tree arg_types = arg_info->types; |
51ef3909 | 6378 | |
32d33ab2 | 6379 | if (funcdef_flag && arg_info->had_vla_unspec) |
6380 | { | |
6381 | /* A function definition isn't function prototype scope C99 6.2.1p4. */ | |
6382 | /* C99 6.7.5.2p4 */ | |
6383 | error ("%<[*]%> not allowed in other than function prototype scope"); | |
6384 | } | |
6385 | ||
6bf97f82 | 6386 | if (arg_types == 0 && !funcdef_flag && !in_system_header) |
6387 | warning (OPT_Wstrict_prototypes, | |
6388 | "function declaration isn%'t a prototype"); | |
51ef3909 | 6389 | |
393b349a | 6390 | if (arg_types == error_mark_node) |
6391 | return 0; /* don't set TYPE_ARG_TYPES in this case */ | |
6392 | ||
6393 | else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE) | |
51ef3909 | 6394 | { |
84166705 | 6395 | if (!funcdef_flag) |
35974859 | 6396 | { |
6397 | pedwarn (input_location, 0, "parameter names (without types) in function declaration"); | |
6398 | arg_info->parms = NULL_TREE; | |
6399 | } | |
6400 | else | |
6401 | arg_info->parms = arg_info->types; | |
51ef3909 | 6402 | |
ac206aff | 6403 | arg_info->types = 0; |
51ef3909 | 6404 | return 0; |
6405 | } | |
6406 | else | |
6407 | { | |
a89ce285 | 6408 | tree parm, type, typelt; |
6409 | unsigned int parmno; | |
2b3c93a3 | 6410 | const char *errmsg; |
a89ce285 | 6411 | |
a207ca5e | 6412 | /* If there is a parameter of incomplete type in a definition, |
6413 | this is an error. In a declaration this is valid, and a | |
6414 | struct or union type may be completed later, before any calls | |
6415 | or definition of the function. In the case where the tag was | |
6416 | first declared within the parameter list, a warning has | |
6417 | already been given. If a parameter has void type, then | |
6418 | however the function cannot be defined or called, so | |
6419 | warn. */ | |
a89ce285 | 6420 | |
ac206aff | 6421 | for (parm = arg_info->parms, typelt = arg_types, parmno = 1; |
2b652cf3 | 6422 | parm; |
1767a056 | 6423 | parm = DECL_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++) |
a89ce285 | 6424 | { |
6425 | type = TREE_VALUE (typelt); | |
6426 | if (type == error_mark_node) | |
6427 | continue; | |
6428 | ||
6429 | if (!COMPLETE_TYPE_P (type)) | |
6430 | { | |
6431 | if (funcdef_flag) | |
6432 | { | |
6433 | if (DECL_NAME (parm)) | |
712d2297 | 6434 | error_at (input_location, |
6435 | "parameter %u (%q+D) has incomplete type", | |
6436 | parmno, parm); | |
a89ce285 | 6437 | else |
712d2297 | 6438 | error_at (DECL_SOURCE_LOCATION (parm), |
6439 | "parameter %u has incomplete type", | |
6440 | parmno); | |
51ef3909 | 6441 | |
a89ce285 | 6442 | TREE_VALUE (typelt) = error_mark_node; |
6443 | TREE_TYPE (parm) = error_mark_node; | |
25910510 | 6444 | arg_types = NULL_TREE; |
a89ce285 | 6445 | } |
a207ca5e | 6446 | else if (VOID_TYPE_P (type)) |
a89ce285 | 6447 | { |
6448 | if (DECL_NAME (parm)) | |
712d2297 | 6449 | warning_at (input_location, 0, |
6450 | "parameter %u (%q+D) has void type", | |
6451 | parmno, parm); | |
a89ce285 | 6452 | else |
712d2297 | 6453 | warning_at (DECL_SOURCE_LOCATION (parm), 0, |
6454 | "parameter %u has void type", | |
6455 | parmno); | |
a89ce285 | 6456 | } |
6457 | } | |
40c4b476 | 6458 | |
2b3c93a3 | 6459 | errmsg = targetm.invalid_parameter_type (type); |
6460 | if (errmsg) | |
6461 | { | |
6462 | error (errmsg); | |
6463 | TREE_VALUE (typelt) = error_mark_node; | |
6464 | TREE_TYPE (parm) = error_mark_node; | |
25910510 | 6465 | arg_types = NULL_TREE; |
2b3c93a3 | 6466 | } |
6467 | ||
40c4b476 | 6468 | if (DECL_NAME (parm) && TREE_USED (parm)) |
6469 | warn_if_shadowing (parm); | |
a89ce285 | 6470 | } |
6471 | return arg_types; | |
51ef3909 | 6472 | } |
6473 | } | |
6474 | ||
cfbfcd0b | 6475 | /* Allocate and initialize a c_arg_info structure from the parser's |
6476 | obstack. */ | |
6477 | ||
6478 | struct c_arg_info * | |
6479 | build_arg_info (void) | |
6480 | { | |
6481 | struct c_arg_info *ret = XOBNEW (&parser_obstack, struct c_arg_info); | |
6482 | ret->parms = NULL_TREE; | |
6483 | ret->tags = NULL; | |
6484 | ret->types = NULL_TREE; | |
6485 | ret->others = NULL_TREE; | |
6486 | ret->pending_sizes = NULL; | |
6487 | ret->had_vla_unspec = 0; | |
6488 | return ret; | |
6489 | } | |
6490 | ||
ac206aff | 6491 | /* Take apart the current scope and return a c_arg_info structure with |
6492 | info on a parameter list just parsed. | |
a89ce285 | 6493 | |
ac206aff | 6494 | This structure is later fed to 'grokparms' and 'store_parm_decls'. |
51ef3909 | 6495 | |
393b349a | 6496 | ELLIPSIS being true means the argument list ended in '...' so don't |
4232a958 | 6497 | append a sentinel (void_list_node) to the end of the type-list. |
6498 | ||
6499 | EXPR is NULL or an expression that needs to be evaluated for the | |
6500 | side effects of array size expressions in the parameters. */ | |
51ef3909 | 6501 | |
ac206aff | 6502 | struct c_arg_info * |
4232a958 | 6503 | get_parm_info (bool ellipsis, tree expr) |
51ef3909 | 6504 | { |
393b349a | 6505 | struct c_binding *b = current_scope->bindings; |
cfbfcd0b | 6506 | struct c_arg_info *arg_info = build_arg_info (); |
6507 | ||
393b349a | 6508 | tree parms = 0; |
f1f41a6c | 6509 | vec<c_arg_tag, va_gc> *tags = NULL; |
393b349a | 6510 | tree types = 0; |
6511 | tree others = 0; | |
6512 | ||
f74be9a1 | 6513 | static bool explained_incomplete_types = false; |
6514 | bool gave_void_only_once_err = false; | |
6515 | ||
32d33ab2 | 6516 | arg_info->had_vla_unspec = current_scope->had_vla_unspec; |
ac206aff | 6517 | |
393b349a | 6518 | /* The bindings in this scope must not get put into a block. |
6519 | We will take care of deleting the binding nodes. */ | |
6520 | current_scope->bindings = 0; | |
51ef3909 | 6521 | |
393b349a | 6522 | /* This function is only called if there was *something* on the |
6523 | parameter list. */ | |
231bd014 | 6524 | gcc_assert (b); |
f74be9a1 | 6525 | |
393b349a | 6526 | /* A parameter list consisting solely of 'void' indicates that the |
6527 | function takes no arguments. But if the 'void' is qualified | |
6528 | (by 'const' or 'volatile'), or has a storage class specifier | |
6529 | ('register'), then the behavior is undefined; issue an error. | |
6530 | Typedefs for 'void' are OK (see DR#157). */ | |
a0c938f0 | 6531 | if (b->prev == 0 /* one binding */ |
393b349a | 6532 | && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */ |
6533 | && !DECL_NAME (b->decl) /* anonymous */ | |
6534 | && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */ | |
6535 | { | |
b560fabd | 6536 | if (TYPE_QUALS (TREE_TYPE (b->decl)) != TYPE_UNQUALIFIED |
7746224a | 6537 | || C_DECL_REGISTER (b->decl)) |
b0b1af64 | 6538 | error ("%<void%> as only parameter may not be qualified"); |
f74be9a1 | 6539 | |
393b349a | 6540 | /* There cannot be an ellipsis. */ |
6541 | if (ellipsis) | |
b0b1af64 | 6542 | error ("%<void%> must be the only parameter"); |
51ef3909 | 6543 | |
ac206aff | 6544 | arg_info->types = void_list_node; |
393b349a | 6545 | return arg_info; |
51ef3909 | 6546 | } |
6547 | ||
393b349a | 6548 | if (!ellipsis) |
6549 | types = void_list_node; | |
51ef3909 | 6550 | |
393b349a | 6551 | /* Break up the bindings list into parms, tags, types, and others; |
6552 | apply sanity checks; purge the name-to-decl bindings. */ | |
6553 | while (b) | |
51ef3909 | 6554 | { |
393b349a | 6555 | tree decl = b->decl; |
6556 | tree type = TREE_TYPE (decl); | |
e82e4eb5 | 6557 | c_arg_tag tag; |
f74be9a1 | 6558 | const char *keyword; |
f74be9a1 | 6559 | |
393b349a | 6560 | switch (TREE_CODE (decl)) |
4214af46 | 6561 | { |
393b349a | 6562 | case PARM_DECL: |
6563 | if (b->id) | |
6564 | { | |
231bd014 | 6565 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); |
393b349a | 6566 | I_SYMBOL_BINDING (b->id) = b->shadowed; |
6567 | } | |
f74be9a1 | 6568 | |
393b349a | 6569 | /* Check for forward decls that never got their actual decl. */ |
6570 | if (TREE_ASM_WRITTEN (decl)) | |
3cf8b391 | 6571 | error ("parameter %q+D has just a forward declaration", decl); |
393b349a | 6572 | /* Check for (..., void, ...) and issue an error. */ |
6573 | else if (VOID_TYPE_P (type) && !DECL_NAME (decl)) | |
6574 | { | |
6575 | if (!gave_void_only_once_err) | |
6576 | { | |
b0b1af64 | 6577 | error ("%<void%> must be the only parameter"); |
393b349a | 6578 | gave_void_only_once_err = true; |
6579 | } | |
6580 | } | |
6581 | else | |
6582 | { | |
6583 | /* Valid parameter, add it to the list. */ | |
1767a056 | 6584 | DECL_CHAIN (decl) = parms; |
393b349a | 6585 | parms = decl; |
6586 | ||
6587 | /* Since there is a prototype, args are passed in their | |
6588 | declared types. The back end may override this later. */ | |
6589 | DECL_ARG_TYPE (decl) = type; | |
6590 | types = tree_cons (0, type, types); | |
6591 | } | |
6592 | break; | |
f74be9a1 | 6593 | |
51acdf76 | 6594 | case ENUMERAL_TYPE: keyword = "enum"; goto tag; |
393b349a | 6595 | case UNION_TYPE: keyword = "union"; goto tag; |
51acdf76 | 6596 | case RECORD_TYPE: keyword = "struct"; goto tag; |
393b349a | 6597 | tag: |
6598 | /* Types may not have tag-names, in which case the type | |
6599 | appears in the bindings list with b->id NULL. */ | |
6600 | if (b->id) | |
6601 | { | |
231bd014 | 6602 | gcc_assert (I_TAG_BINDING (b->id) == b); |
393b349a | 6603 | I_TAG_BINDING (b->id) = b->shadowed; |
6604 | } | |
f74be9a1 | 6605 | |
393b349a | 6606 | /* Warn about any struct, union or enum tags defined in a |
6607 | parameter list. The scope of such types is limited to | |
6608 | the parameter list, which is rarely if ever desirable | |
6609 | (it's impossible to call such a function with type- | |
6610 | correct arguments). An anonymous union parm type is | |
6611 | meaningful as a GNU extension, so don't warn for that. */ | |
6612 | if (TREE_CODE (decl) != UNION_TYPE || b->id != 0) | |
6613 | { | |
6614 | if (b->id) | |
6615 | /* The %s will be one of 'struct', 'union', or 'enum'. */ | |
c3ceba8e | 6616 | warning (0, "%<%s %E%> declared inside parameter list", |
393b349a | 6617 | keyword, b->id); |
6618 | else | |
6619 | /* The %s will be one of 'struct', 'union', or 'enum'. */ | |
c3ceba8e | 6620 | warning (0, "anonymous %s declared inside parameter list", |
393b349a | 6621 | keyword); |
14338e9a | 6622 | |
84166705 | 6623 | if (!explained_incomplete_types) |
393b349a | 6624 | { |
c3ceba8e | 6625 | warning (0, "its scope is only this definition or declaration," |
393b349a | 6626 | " which is probably not what you want"); |
6627 | explained_incomplete_types = true; | |
6628 | } | |
6629 | } | |
f74be9a1 | 6630 | |
e82e4eb5 | 6631 | tag.id = b->id; |
6632 | tag.type = decl; | |
f1f41a6c | 6633 | vec_safe_push (tags, tag); |
393b349a | 6634 | break; |
6635 | ||
6636 | case CONST_DECL: | |
6637 | case TYPE_DECL: | |
702c8527 | 6638 | case FUNCTION_DECL: |
393b349a | 6639 | /* CONST_DECLs appear here when we have an embedded enum, |
6640 | and TYPE_DECLs appear here when we have an embedded struct | |
6641 | or union. No warnings for this - we already warned about the | |
702c8527 | 6642 | type itself. FUNCTION_DECLs appear when there is an implicit |
6643 | function declaration in the parameter list. */ | |
6644 | ||
1799fbab | 6645 | /* When we reinsert this decl in the function body, we need |
6646 | to reconstruct whether it was marked as nested. */ | |
6647 | gcc_assert (TREE_CODE (decl) == FUNCTION_DECL | |
6648 | ? b->nested | |
6649 | : !b->nested); | |
1767a056 | 6650 | DECL_CHAIN (decl) = others; |
56533c31 | 6651 | others = decl; |
6652 | /* fall through */ | |
6653 | ||
6654 | case ERROR_MARK: | |
6655 | /* error_mark_node appears here when we have an undeclared | |
6656 | variable. Just throw it away. */ | |
393b349a | 6657 | if (b->id) |
6658 | { | |
231bd014 | 6659 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); |
393b349a | 6660 | I_SYMBOL_BINDING (b->id) = b->shadowed; |
6661 | } | |
393b349a | 6662 | break; |
6663 | ||
6664 | /* Other things that might be encountered. */ | |
6665 | case LABEL_DECL: | |
393b349a | 6666 | case VAR_DECL: |
393b349a | 6667 | default: |
231bd014 | 6668 | gcc_unreachable (); |
393b349a | 6669 | } |
6670 | ||
6671 | b = free_binding_and_advance (b); | |
f74be9a1 | 6672 | } |
6673 | ||
ac206aff | 6674 | arg_info->parms = parms; |
6675 | arg_info->tags = tags; | |
6676 | arg_info->types = types; | |
6677 | arg_info->others = others; | |
4232a958 | 6678 | arg_info->pending_sizes = expr; |
393b349a | 6679 | return arg_info; |
51ef3909 | 6680 | } |
6681 | \f | |
6682 | /* Get the struct, enum or union (CODE says which) with tag NAME. | |
e60a6f7b | 6683 | Define the tag as a forward-reference with location LOC if it is |
6684 | not defined. Return a c_typespec structure for the type | |
6685 | specifier. */ | |
51ef3909 | 6686 | |
19702c1d | 6687 | struct c_typespec |
e60a6f7b | 6688 | parser_xref_tag (location_t loc, enum tree_code code, tree name) |
51ef3909 | 6689 | { |
19702c1d | 6690 | struct c_typespec ret; |
a75b1c71 | 6691 | tree ref; |
0b09525f | 6692 | location_t refloc; |
a75b1c71 | 6693 | |
6694 | ret.expr = NULL_TREE; | |
6695 | ret.expr_const_operands = true; | |
6696 | ||
51ef3909 | 6697 | /* If a cross reference is requested, look up the type |
6698 | already defined for this tag and return it. */ | |
6699 | ||
0b09525f | 6700 | ref = lookup_tag (code, name, 0, &refloc); |
ea97174b | 6701 | /* If this is the right type of tag, return what we found. |
6702 | (This reference will be shadowed by shadow_tag later if appropriate.) | |
6703 | If this is the wrong type of tag, do not return it. If it was the | |
6e899616 | 6704 | wrong type in the same scope, we will have had an error |
6705 | message already; if in a different scope and declaring | |
ea97174b | 6706 | a name, pending_xref_error will give an error message; but if in a |
6e899616 | 6707 | different scope and not declaring a name, this tag should |
ea97174b | 6708 | shadow the previous declaration of a different type of tag, and |
6709 | this would not work properly if we return the reference found. | |
6710 | (For example, with "struct foo" in an outer scope, "union foo;" | |
6711 | must shadow that tag with a new one of union type.) */ | |
19702c1d | 6712 | ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref); |
ea97174b | 6713 | if (ref && TREE_CODE (ref) == code) |
19702c1d | 6714 | { |
0b09525f | 6715 | if (C_TYPE_DEFINED_IN_STRUCT (ref) |
6716 | && loc != UNKNOWN_LOCATION | |
6717 | && warn_cxx_compat) | |
6718 | { | |
6719 | switch (code) | |
6720 | { | |
6721 | case ENUMERAL_TYPE: | |
6722 | warning_at (loc, OPT_Wc___compat, | |
6723 | ("enum type defined in struct or union " | |
6724 | "is not visible in C++")); | |
6725 | inform (refloc, "enum type defined here"); | |
6726 | break; | |
6727 | case RECORD_TYPE: | |
6728 | warning_at (loc, OPT_Wc___compat, | |
6729 | ("struct defined in struct or union " | |
6730 | "is not visible in C++")); | |
6731 | inform (refloc, "struct defined here"); | |
6732 | break; | |
6733 | case UNION_TYPE: | |
6734 | warning_at (loc, OPT_Wc___compat, | |
6735 | ("union defined in struct or union " | |
6736 | "is not visible in C++")); | |
6737 | inform (refloc, "union defined here"); | |
6738 | break; | |
6739 | default: | |
6740 | gcc_unreachable(); | |
6741 | } | |
6742 | } | |
6743 | ||
19702c1d | 6744 | ret.spec = ref; |
6745 | return ret; | |
6746 | } | |
51ef3909 | 6747 | |
51ef3909 | 6748 | /* If no such tag is yet defined, create a forward-reference node |
6749 | and record it as the "definition". | |
6750 | When a real declaration of this type is found, | |
6751 | the forward-reference will be altered into a real type. */ | |
6752 | ||
6753 | ref = make_node (code); | |
6754 | if (code == ENUMERAL_TYPE) | |
6755 | { | |
51ef3909 | 6756 | /* Give the type a default layout like unsigned int |
6757 | to avoid crashing if it does not get defined. */ | |
342ad2d6 | 6758 | SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node)); |
51ef3909 | 6759 | TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node); |
aca14577 | 6760 | TYPE_USER_ALIGN (ref) = 0; |
78a8ed03 | 6761 | TYPE_UNSIGNED (ref) = 1; |
51ef3909 | 6762 | TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node); |
6763 | TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node); | |
6764 | TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node); | |
6765 | } | |
6766 | ||
e60a6f7b | 6767 | pushtag (loc, name, ref); |
51ef3909 | 6768 | |
19702c1d | 6769 | ret.spec = ref; |
6770 | return ret; | |
6771 | } | |
6772 | ||
6773 | /* Get the struct, enum or union (CODE says which) with tag NAME. | |
6774 | Define the tag as a forward-reference if it is not defined. | |
6775 | Return a tree for the type. */ | |
6776 | ||
6777 | tree | |
6778 | xref_tag (enum tree_code code, tree name) | |
6779 | { | |
e60a6f7b | 6780 | return parser_xref_tag (input_location, code, name).spec; |
51ef3909 | 6781 | } |
6782 | \f | |
6e899616 | 6783 | /* Make sure that the tag NAME is defined *in the current scope* |
51ef3909 | 6784 | at least as a forward reference. |
e60a6f7b | 6785 | LOC is the location of the struct's definition. |
0b09525f | 6786 | CODE says which kind of tag NAME ought to be. |
6787 | ||
843bd2fa | 6788 | This stores the current value of the file static STRUCT_PARSE_INFO |
6789 | in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a | |
6790 | new c_struct_parse_info structure. The old value of | |
6791 | STRUCT_PARSE_INFO is restored in finish_struct. */ | |
51ef3909 | 6792 | |
6793 | tree | |
e60a6f7b | 6794 | start_struct (location_t loc, enum tree_code code, tree name, |
843bd2fa | 6795 | struct c_struct_parse_info **enclosing_struct_parse_info) |
51ef3909 | 6796 | { |
6e899616 | 6797 | /* If there is already a tag defined at this scope |
51ef3909 | 6798 | (as a forward reference), just return it. */ |
6799 | ||
0b09525f | 6800 | tree ref = NULL_TREE; |
6801 | location_t refloc = UNKNOWN_LOCATION; | |
51ef3909 | 6802 | |
0b09525f | 6803 | if (name != NULL_TREE) |
6804 | ref = lookup_tag (code, name, 1, &refloc); | |
51ef3909 | 6805 | if (ref && TREE_CODE (ref) == code) |
6806 | { | |
5dad28f1 | 6807 | if (TYPE_SIZE (ref)) |
a0c938f0 | 6808 | { |
1a5a5cd8 | 6809 | if (code == UNION_TYPE) |
0b09525f | 6810 | error_at (loc, "redefinition of %<union %E%>", name); |
a0c938f0 | 6811 | else |
0b09525f | 6812 | error_at (loc, "redefinition of %<struct %E%>", name); |
6813 | if (refloc != UNKNOWN_LOCATION) | |
6814 | inform (refloc, "originally defined here"); | |
fc92befb | 6815 | /* Don't create structures using a name already in use. */ |
6816 | ref = NULL_TREE; | |
1cae46be | 6817 | } |
5dad28f1 | 6818 | else if (C_TYPE_BEING_DEFINED (ref)) |
6819 | { | |
6820 | if (code == UNION_TYPE) | |
0b09525f | 6821 | error_at (loc, "nested redefinition of %<union %E%>", name); |
a0c938f0 | 6822 | else |
0b09525f | 6823 | error_at (loc, "nested redefinition of %<struct %E%>", name); |
6824 | /* Don't bother to report "originally defined here" for a | |
6825 | nested redefinition; the original definition should be | |
6826 | obvious. */ | |
c42cc79e | 6827 | /* Don't create structures that contain themselves. */ |
6828 | ref = NULL_TREE; | |
5dad28f1 | 6829 | } |
51ef3909 | 6830 | } |
6831 | ||
c42cc79e | 6832 | /* Otherwise create a forward-reference just so the tag is in scope. */ |
6833 | ||
6834 | if (ref == NULL_TREE || TREE_CODE (ref) != code) | |
6835 | { | |
67be5043 | 6836 | ref = make_node (code); |
e60a6f7b | 6837 | pushtag (loc, name, ref); |
67be5043 | 6838 | } |
1cae46be | 6839 | |
51ef3909 | 6840 | C_TYPE_BEING_DEFINED (ref) = 1; |
93aaccf8 | 6841 | TYPE_PACKED (ref) = flag_pack_struct; |
0b09525f | 6842 | |
843bd2fa | 6843 | *enclosing_struct_parse_info = struct_parse_info; |
6844 | struct_parse_info = XNEW (struct c_struct_parse_info); | |
f1f41a6c | 6845 | struct_parse_info->struct_types.create (0); |
6846 | struct_parse_info->fields.create (0); | |
6847 | struct_parse_info->typedefs_seen.create (0); | |
0b09525f | 6848 | |
6849 | /* FIXME: This will issue a warning for a use of a type defined | |
6850 | within a statement expr used within sizeof, et. al. This is not | |
6851 | terribly serious as C++ doesn't permit statement exprs within | |
6852 | sizeof anyhow. */ | |
6853 | if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof)) | |
6854 | warning_at (loc, OPT_Wc___compat, | |
6855 | "defining type in %qs expression is invalid in C++", | |
6856 | (in_sizeof | |
6857 | ? "sizeof" | |
6858 | : (in_typeof ? "typeof" : "alignof"))); | |
6859 | ||
51ef3909 | 6860 | return ref; |
6861 | } | |
6862 | ||
ac206aff | 6863 | /* Process the specs, declarator and width (NULL if omitted) |
51ef3909 | 6864 | of a structure component, returning a FIELD_DECL node. |
2d1a2840 | 6865 | WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node. |
e47ffaae | 6866 | DECL_ATTRS is as for grokdeclarator. |
51ef3909 | 6867 | |
d520c1f2 | 6868 | LOC is the location of the structure component. |
6869 | ||
51ef3909 | 6870 | This is done during the parsing of the struct declaration. |
6871 | The FIELD_DECL nodes are chained together and the lot of them | |
6872 | are ultimately passed to `build_struct' to make the RECORD_TYPE node. */ | |
6873 | ||
6874 | tree | |
d520c1f2 | 6875 | grokfield (location_t loc, |
6876 | struct c_declarator *declarator, struct c_declspecs *declspecs, | |
e47ffaae | 6877 | tree width, tree *decl_attrs) |
51ef3909 | 6878 | { |
6879 | tree value; | |
6880 | ||
ac206aff | 6881 | if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE |
6882 | && width == NULL_TREE) | |
7cb6c162 | 6883 | { |
07ebd091 | 6884 | /* This is an unnamed decl. |
6885 | ||
6886 | If we have something of the form "union { list } ;" then this | |
6887 | is the anonymous union extension. Similarly for struct. | |
6888 | ||
6889 | If this is something of the form "struct foo;", then | |
2fdec027 | 6890 | If MS or Plan 9 extensions are enabled, this is handled as |
6891 | an anonymous struct. | |
07ebd091 | 6892 | Otherwise this is a forward declaration of a structure tag. |
6893 | ||
6894 | If this is something of the form "foo;" and foo is a TYPE_DECL, then | |
afb3d3c4 | 6895 | If foo names a structure or union without a tag, then this |
32074525 | 6896 | is an anonymous struct (this is permitted by C11). |
2fdec027 | 6897 | If MS or Plan 9 extensions are enabled and foo names a |
6898 | structure, then again this is an anonymous struct. | |
07ebd091 | 6899 | Otherwise this is an error. |
6900 | ||
d716ce75 | 6901 | Oh what a horrid tangled web we weave. I wonder if MS consciously |
07ebd091 | 6902 | took this from Plan 9 or if it was an accident of implementation |
6903 | that took root before someone noticed the bug... */ | |
6904 | ||
9553111d | 6905 | tree type = declspecs->type; |
95ad7a71 | 6906 | bool type_ok = (TREE_CODE (type) == RECORD_TYPE |
6907 | || TREE_CODE (type) == UNION_TYPE); | |
6908 | bool ok = false; | |
188fc74c | 6909 | |
9b280b35 | 6910 | if (type_ok |
6911 | && (flag_ms_extensions | |
6912 | || flag_plan9_extensions | |
6913 | || !declspecs->typedef_p)) | |
07ebd091 | 6914 | { |
2fdec027 | 6915 | if (flag_ms_extensions || flag_plan9_extensions) |
95ad7a71 | 6916 | ok = true; |
9b280b35 | 6917 | else if (TYPE_NAME (type) == NULL) |
95ad7a71 | 6918 | ok = true; |
07ebd091 | 6919 | else |
95ad7a71 | 6920 | ok = false; |
07ebd091 | 6921 | } |
95ad7a71 | 6922 | if (!ok) |
7cb6c162 | 6923 | { |
d520c1f2 | 6924 | pedwarn (loc, 0, "declaration does not declare anything"); |
7cb6c162 | 6925 | return NULL_TREE; |
6926 | } | |
32074525 | 6927 | if (!flag_isoc11) |
afb3d3c4 | 6928 | { |
6929 | if (flag_isoc99) | |
29438999 | 6930 | pedwarn (loc, OPT_Wpedantic, |
afb3d3c4 | 6931 | "ISO C99 doesn%'t support unnamed structs/unions"); |
6932 | else | |
29438999 | 6933 | pedwarn (loc, OPT_Wpedantic, |
afb3d3c4 | 6934 | "ISO C90 doesn%'t support unnamed structs/unions"); |
6935 | } | |
7cb6c162 | 6936 | } |
6937 | ||
4a125bfc | 6938 | value = grokdeclarator (declarator, declspecs, FIELD, false, |
a75b1c71 | 6939 | width ? &width : NULL, decl_attrs, NULL, NULL, |
e47ffaae | 6940 | DEPRECATED_NORMAL); |
51ef3909 | 6941 | |
e60a6f7b | 6942 | finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE); |
b9d8dcc9 | 6943 | DECL_INITIAL (value) = width; |
51ef3909 | 6944 | |
843bd2fa | 6945 | if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE) |
6946 | { | |
6947 | /* If we currently have a binding for this field, set the | |
6948 | in_struct field in the binding, so that we warn about lookups | |
6949 | which find it. */ | |
6950 | struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value)); | |
6951 | if (b != NULL) | |
6952 | { | |
6953 | /* If the in_struct field is not yet set, push it on a list | |
6954 | to be cleared when this struct is finished. */ | |
6955 | if (!b->in_struct) | |
6956 | { | |
f1f41a6c | 6957 | struct_parse_info->fields.safe_push (b); |
843bd2fa | 6958 | b->in_struct = 1; |
6959 | } | |
6960 | } | |
6961 | } | |
6962 | ||
51ef3909 | 6963 | return value; |
6964 | } | |
6965 | \f | |
2fdec027 | 6966 | /* Subroutine of detect_field_duplicates: return whether X and Y, |
6967 | which are both fields in the same struct, have duplicate field | |
6968 | names. */ | |
6969 | ||
6970 | static bool | |
6971 | is_duplicate_field (tree x, tree y) | |
6972 | { | |
6973 | if (DECL_NAME (x) != NULL_TREE && DECL_NAME (x) == DECL_NAME (y)) | |
6974 | return true; | |
6975 | ||
6976 | /* When using -fplan9-extensions, an anonymous field whose name is a | |
6977 | typedef can duplicate a field name. */ | |
6978 | if (flag_plan9_extensions | |
6979 | && (DECL_NAME (x) == NULL_TREE || DECL_NAME (y) == NULL_TREE)) | |
6980 | { | |
6981 | tree xt, xn, yt, yn; | |
6982 | ||
6983 | xt = TREE_TYPE (x); | |
6984 | if (DECL_NAME (x) != NULL_TREE) | |
6985 | xn = DECL_NAME (x); | |
6986 | else if ((TREE_CODE (xt) == RECORD_TYPE || TREE_CODE (xt) == UNION_TYPE) | |
6987 | && TYPE_NAME (xt) != NULL_TREE | |
6988 | && TREE_CODE (TYPE_NAME (xt)) == TYPE_DECL) | |
6989 | xn = DECL_NAME (TYPE_NAME (xt)); | |
6990 | else | |
6991 | xn = NULL_TREE; | |
6992 | ||
6993 | yt = TREE_TYPE (y); | |
6994 | if (DECL_NAME (y) != NULL_TREE) | |
6995 | yn = DECL_NAME (y); | |
6996 | else if ((TREE_CODE (yt) == RECORD_TYPE || TREE_CODE (yt) == UNION_TYPE) | |
6997 | && TYPE_NAME (yt) != NULL_TREE | |
6998 | && TREE_CODE (TYPE_NAME (yt)) == TYPE_DECL) | |
6999 | yn = DECL_NAME (TYPE_NAME (yt)); | |
7000 | else | |
7001 | yn = NULL_TREE; | |
7002 | ||
7003 | if (xn != NULL_TREE && xn == yn) | |
7004 | return true; | |
7005 | } | |
7006 | ||
7007 | return false; | |
7008 | } | |
7009 | ||
8af5341f | 7010 | /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST |
7011 | to HTAB, giving errors for any duplicates. */ | |
7012 | ||
7013 | static void | |
d1455aa3 | 7014 | detect_field_duplicates_hash (tree fieldlist, |
7015 | hash_table <pointer_hash <tree_node> > htab) | |
8af5341f | 7016 | { |
7017 | tree x, y; | |
d1455aa3 | 7018 | tree_node **slot; |
8af5341f | 7019 | |
1767a056 | 7020 | for (x = fieldlist; x ; x = DECL_CHAIN (x)) |
8af5341f | 7021 | if ((y = DECL_NAME (x)) != 0) |
7022 | { | |
d1455aa3 | 7023 | slot = htab.find_slot (y, INSERT); |
8af5341f | 7024 | if (*slot) |
7025 | { | |
7026 | error ("duplicate member %q+D", x); | |
7027 | DECL_NAME (x) = NULL_TREE; | |
7028 | } | |
7029 | *slot = y; | |
7030 | } | |
7031 | else if (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE | |
7032 | || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE) | |
2fdec027 | 7033 | { |
7034 | detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x)), htab); | |
7035 | ||
7036 | /* When using -fplan9-extensions, an anonymous field whose | |
7037 | name is a typedef can duplicate a field name. */ | |
7038 | if (flag_plan9_extensions | |
7039 | && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE | |
7040 | && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL) | |
7041 | { | |
7042 | tree xn = DECL_NAME (TYPE_NAME (TREE_TYPE (x))); | |
d1455aa3 | 7043 | slot = htab.find_slot (xn, INSERT); |
2fdec027 | 7044 | if (*slot) |
7045 | error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x))); | |
7046 | *slot = xn; | |
7047 | } | |
7048 | } | |
8af5341f | 7049 | } |
7050 | ||
4d2aa485 | 7051 | /* Generate an error for any duplicate field names in FIELDLIST. Munge |
7052 | the list such that this does not present a problem later. */ | |
7053 | ||
7054 | static void | |
7055 | detect_field_duplicates (tree fieldlist) | |
7056 | { | |
7057 | tree x, y; | |
7058 | int timeout = 10; | |
7059 | ||
e93ea189 | 7060 | /* If the struct is the list of instance variables of an Objective-C |
394dd737 | 7061 | class, then we need to check all the instance variables of |
7062 | superclasses when checking for duplicates (since you can't have | |
e93ea189 | 7063 | an instance variable in a subclass with the same name as an |
394dd737 | 7064 | instance variable in a superclass). We pass on this job to the |
7065 | Objective-C compiler. objc_detect_field_duplicates() will return | |
7066 | false if we are not checking the list of instance variables and | |
7067 | the C frontend should proceed with the standard field duplicate | |
7068 | checks. If we are checking the list of instance variables, the | |
7069 | ObjC frontend will do the check, emit the errors if needed, and | |
7070 | then return true. */ | |
e93ea189 | 7071 | if (c_dialect_objc ()) |
394dd737 | 7072 | if (objc_detect_field_duplicates (false)) |
7073 | return; | |
e93ea189 | 7074 | |
4d2aa485 | 7075 | /* First, see if there are more than "a few" fields. |
7076 | This is trivially true if there are zero or one fields. */ | |
4f4d5f36 | 7077 | if (!fieldlist || !DECL_CHAIN (fieldlist)) |
4d2aa485 | 7078 | return; |
4f4d5f36 | 7079 | x = fieldlist; |
4d2aa485 | 7080 | do { |
7081 | timeout--; | |
8af5341f | 7082 | if (DECL_NAME (x) == NULL_TREE |
7083 | && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE | |
7084 | || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)) | |
7085 | timeout = 0; | |
1767a056 | 7086 | x = DECL_CHAIN (x); |
4d2aa485 | 7087 | } while (timeout > 0 && x); |
7088 | ||
8af5341f | 7089 | /* If there were "few" fields and no anonymous structures or unions, |
7090 | avoid the overhead of allocating a hash table. Instead just do | |
7091 | the nested traversal thing. */ | |
4d2aa485 | 7092 | if (timeout > 0) |
7093 | { | |
d059ef79 | 7094 | for (x = DECL_CHAIN (fieldlist); x; x = DECL_CHAIN (x)) |
2fdec027 | 7095 | /* When using -fplan9-extensions, we can have duplicates |
7096 | between typedef names and fields. */ | |
7097 | if (DECL_NAME (x) | |
7098 | || (flag_plan9_extensions | |
7099 | && DECL_NAME (x) == NULL_TREE | |
7100 | && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE | |
7101 | || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE) | |
7102 | && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE | |
7103 | && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL)) | |
4d2aa485 | 7104 | { |
7105 | for (y = fieldlist; y != x; y = TREE_CHAIN (y)) | |
2fdec027 | 7106 | if (is_duplicate_field (y, x)) |
4d2aa485 | 7107 | { |
3cf8b391 | 7108 | error ("duplicate member %q+D", x); |
4d2aa485 | 7109 | DECL_NAME (x) = NULL_TREE; |
7110 | } | |
7111 | } | |
7112 | } | |
7113 | else | |
7114 | { | |
d1455aa3 | 7115 | hash_table <pointer_hash <tree_node> > htab; |
7116 | htab.create (37); | |
4d2aa485 | 7117 | |
8af5341f | 7118 | detect_field_duplicates_hash (fieldlist, htab); |
d1455aa3 | 7119 | htab.dispose (); |
4d2aa485 | 7120 | } |
7121 | } | |
7122 | ||
843bd2fa | 7123 | /* Finish up struct info used by -Wc++-compat. */ |
7124 | ||
7125 | static void | |
7126 | warn_cxx_compat_finish_struct (tree fieldlist) | |
7127 | { | |
7128 | unsigned int ix; | |
7129 | tree x; | |
7130 | struct c_binding *b; | |
7131 | ||
7132 | /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in | |
7133 | the current struct. We do this now at the end of the struct | |
7134 | because the flag is used to issue visibility warnings, and we | |
7135 | only want to issue those warnings if the type is referenced | |
7136 | outside of the struct declaration. */ | |
f1f41a6c | 7137 | FOR_EACH_VEC_ELT (struct_parse_info->struct_types, ix, x) |
843bd2fa | 7138 | C_TYPE_DEFINED_IN_STRUCT (x) = 1; |
7139 | ||
7140 | /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of | |
7141 | typedefs used when declaring fields in this struct. If the name | |
7142 | of any of the fields is also a typedef name then the struct would | |
7143 | not parse in C++, because the C++ lookup rules say that the | |
7144 | typedef name would be looked up in the context of the struct, and | |
7145 | would thus be the field rather than the typedef. */ | |
f1f41a6c | 7146 | if (!struct_parse_info->typedefs_seen.is_empty () |
843bd2fa | 7147 | && fieldlist != NULL_TREE) |
7148 | { | |
7149 | /* Use a pointer_set using the name of the typedef. We can use | |
7150 | a pointer_set because identifiers are interned. */ | |
7151 | struct pointer_set_t *tset = pointer_set_create (); | |
7152 | ||
f1f41a6c | 7153 | FOR_EACH_VEC_ELT (struct_parse_info->typedefs_seen, ix, x) |
843bd2fa | 7154 | pointer_set_insert (tset, DECL_NAME (x)); |
7155 | ||
1767a056 | 7156 | for (x = fieldlist; x != NULL_TREE; x = DECL_CHAIN (x)) |
843bd2fa | 7157 | { |
56712363 | 7158 | if (DECL_NAME (x) != NULL_TREE |
7159 | && pointer_set_contains (tset, DECL_NAME (x))) | |
843bd2fa | 7160 | { |
7161 | warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat, | |
7162 | ("using %qD as both field and typedef name is " | |
7163 | "invalid in C++"), | |
7164 | x); | |
7165 | /* FIXME: It would be nice to report the location where | |
7166 | the typedef name is used. */ | |
7167 | } | |
7168 | } | |
7169 | ||
7170 | pointer_set_destroy (tset); | |
7171 | } | |
7172 | ||
7173 | /* For each field which has a binding and which was not defined in | |
7174 | an enclosing struct, clear the in_struct field. */ | |
f1f41a6c | 7175 | FOR_EACH_VEC_ELT (struct_parse_info->fields, ix, b) |
843bd2fa | 7176 | b->in_struct = 0; |
7177 | } | |
7178 | ||
51ef3909 | 7179 | /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T. |
e60a6f7b | 7180 | LOC is the location of the RECORD_TYPE or UNION_TYPE's definition. |
9c316e51 | 7181 | FIELDLIST is a chain of FIELD_DECL nodes for the fields. |
0b09525f | 7182 | ATTRIBUTES are attributes to be applied to the structure. |
7183 | ||
843bd2fa | 7184 | ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when |
7185 | the struct was started. */ | |
51ef3909 | 7186 | |
7187 | tree | |
e60a6f7b | 7188 | finish_struct (location_t loc, tree t, tree fieldlist, tree attributes, |
843bd2fa | 7189 | struct c_struct_parse_info *enclosing_struct_parse_info) |
51ef3909 | 7190 | { |
19cb6b50 | 7191 | tree x; |
393b349a | 7192 | bool toplevel = file_scope == current_scope; |
21c8999d | 7193 | int saw_named_field; |
51ef3909 | 7194 | |
7195 | /* If this type was previously laid out as a forward reference, | |
7196 | make sure we lay it out again. */ | |
7197 | ||
7198 | TYPE_SIZE (t) = 0; | |
7199 | ||
e3c541f0 | 7200 | decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); |
92b4910b | 7201 | |
328469d8 | 7202 | if (pedantic) |
7203 | { | |
1767a056 | 7204 | for (x = fieldlist; x; x = DECL_CHAIN (x)) |
afb3d3c4 | 7205 | { |
7206 | if (DECL_NAME (x) != 0) | |
7207 | break; | |
32074525 | 7208 | if (flag_isoc11 |
afb3d3c4 | 7209 | && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE |
7210 | || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)) | |
7211 | break; | |
7212 | } | |
328469d8 | 7213 | |
7214 | if (x == 0) | |
4ed53d3d | 7215 | { |
7216 | if (TREE_CODE (t) == UNION_TYPE) | |
7217 | { | |
7218 | if (fieldlist) | |
29438999 | 7219 | pedwarn (loc, OPT_Wpedantic, "union has no named members"); |
4ed53d3d | 7220 | else |
29438999 | 7221 | pedwarn (loc, OPT_Wpedantic, "union has no members"); |
4ed53d3d | 7222 | } |
7223 | else | |
7224 | { | |
7225 | if (fieldlist) | |
29438999 | 7226 | pedwarn (loc, OPT_Wpedantic, "struct has no named members"); |
4ed53d3d | 7227 | else |
29438999 | 7228 | pedwarn (loc, OPT_Wpedantic, "struct has no members"); |
4ed53d3d | 7229 | } |
7230 | } | |
328469d8 | 7231 | } |
51ef3909 | 7232 | |
b9d8dcc9 | 7233 | /* Install struct as DECL_CONTEXT of each field decl. |
4f7f7efd | 7234 | Also process specified field sizes, found in the DECL_INITIAL, |
7235 | storing 0 there after the type has been changed to precision equal | |
7236 | to its width, rather than the precision of the specified standard | |
7237 | type. (Correct layout requires the original type to have been preserved | |
7238 | until now.) */ | |
51ef3909 | 7239 | |
21c8999d | 7240 | saw_named_field = 0; |
1767a056 | 7241 | for (x = fieldlist; x; x = DECL_CHAIN (x)) |
51ef3909 | 7242 | { |
b4b63acb | 7243 | if (TREE_TYPE (x) == error_mark_node) |
7244 | continue; | |
7245 | ||
51ef3909 | 7246 | DECL_CONTEXT (x) = t; |
c2ab04f9 | 7247 | |
51ef3909 | 7248 | /* If any field is const, the structure type is pseudo-const. */ |
7249 | if (TREE_READONLY (x)) | |
7250 | C_TYPE_FIELDS_READONLY (t) = 1; | |
7251 | else | |
7252 | { | |
7253 | /* A field that is pseudo-const makes the structure likewise. */ | |
980b024a | 7254 | tree t1 = strip_array_types (TREE_TYPE (x)); |
51ef3909 | 7255 | if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE) |
7256 | && C_TYPE_FIELDS_READONLY (t1)) | |
7257 | C_TYPE_FIELDS_READONLY (t) = 1; | |
7258 | } | |
7259 | ||
7260 | /* Any field that is volatile means variables of this type must be | |
7261 | treated in some ways as volatile. */ | |
7262 | if (TREE_THIS_VOLATILE (x)) | |
7263 | C_TYPE_FIELDS_VOLATILE (t) = 1; | |
7264 | ||
7265 | /* Any field of nominal variable size implies structure is too. */ | |
7266 | if (C_DECL_VARIABLE_SIZE (x)) | |
7267 | C_TYPE_VARIABLE_SIZE (t) = 1; | |
7268 | ||
b9d8dcc9 | 7269 | if (DECL_INITIAL (x)) |
7270 | { | |
6a0712d4 | 7271 | unsigned HOST_WIDE_INT width = tree_to_uhwi (DECL_INITIAL (x)); |
2d1a2840 | 7272 | DECL_SIZE (x) = bitsize_int (width); |
7273 | DECL_BIT_FIELD (x) = 1; | |
7274 | SET_DECL_C_BIT_FIELD (x); | |
b9d8dcc9 | 7275 | } |
7276 | ||
9fd767c5 | 7277 | if (TYPE_PACKED (t) |
7278 | && (DECL_BIT_FIELD (x) | |
7279 | || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT)) | |
7280 | DECL_PACKED (x) = 1; | |
7281 | ||
21c8999d | 7282 | /* Detect flexible array member in an invalid context. */ |
7283 | if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE | |
7284 | && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE | |
7285 | && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE | |
7286 | && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE) | |
7287 | { | |
7288 | if (TREE_CODE (t) == UNION_TYPE) | |
206d8357 | 7289 | { |
e60a6f7b | 7290 | error_at (DECL_SOURCE_LOCATION (x), |
712d2297 | 7291 | "flexible array member in union"); |
206d8357 | 7292 | TREE_TYPE (x) = error_mark_node; |
7293 | } | |
1767a056 | 7294 | else if (DECL_CHAIN (x) != NULL_TREE) |
206d8357 | 7295 | { |
e60a6f7b | 7296 | error_at (DECL_SOURCE_LOCATION (x), |
712d2297 | 7297 | "flexible array member not at end of struct"); |
206d8357 | 7298 | TREE_TYPE (x) = error_mark_node; |
7299 | } | |
84166705 | 7300 | else if (!saw_named_field) |
206d8357 | 7301 | { |
e60a6f7b | 7302 | error_at (DECL_SOURCE_LOCATION (x), |
712d2297 | 7303 | "flexible array member in otherwise empty struct"); |
206d8357 | 7304 | TREE_TYPE (x) = error_mark_node; |
7305 | } | |
21c8999d | 7306 | } |
ce09bc13 | 7307 | |
712d2297 | 7308 | if (pedantic && TREE_CODE (t) == RECORD_TYPE |
ce09bc13 | 7309 | && flexible_array_type_p (TREE_TYPE (x))) |
29438999 | 7310 | pedwarn (DECL_SOURCE_LOCATION (x), OPT_Wpedantic, |
712d2297 | 7311 | "invalid use of structure with flexible array member"); |
ce09bc13 | 7312 | |
afb3d3c4 | 7313 | if (DECL_NAME (x) |
7314 | || TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE | |
7315 | || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE) | |
21c8999d | 7316 | saw_named_field = 1; |
a0c2c45b | 7317 | } |
51ef3909 | 7318 | |
4d2aa485 | 7319 | detect_field_duplicates (fieldlist); |
51ef3909 | 7320 | |
7321 | /* Now we have the nearly final fieldlist. Record it, | |
7322 | then lay out the structure or union (including the fields). */ | |
7323 | ||
7324 | TYPE_FIELDS (t) = fieldlist; | |
7325 | ||
7326 | layout_type (t); | |
7327 | ||
76bbe4ca | 7328 | if (TYPE_SIZE_UNIT (t) |
7329 | && TREE_CODE (TYPE_SIZE_UNIT (t)) == INTEGER_CST | |
7330 | && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t)) | |
7331 | && !valid_constant_size_p (TYPE_SIZE_UNIT (t))) | |
7332 | error ("type %qT is too large", t); | |
7333 | ||
4f7f7efd | 7334 | /* Give bit-fields their proper types. */ |
813a136d | 7335 | { |
7336 | tree *fieldlistp = &fieldlist; | |
d4d302bd | 7337 | while (*fieldlistp) |
4f7f7efd | 7338 | if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp) |
7339 | && TREE_TYPE (*fieldlistp) != error_mark_node) | |
7340 | { | |
7341 | unsigned HOST_WIDE_INT width | |
6a0712d4 | 7342 | = tree_to_uhwi (DECL_INITIAL (*fieldlistp)); |
4f7f7efd | 7343 | tree type = TREE_TYPE (*fieldlistp); |
7344 | if (width != TYPE_PRECISION (type)) | |
24bdc387 | 7345 | { |
7346 | TREE_TYPE (*fieldlistp) | |
2ac1e110 | 7347 | = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type)); |
24bdc387 | 7348 | DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp)); |
7349 | } | |
4f7f7efd | 7350 | DECL_INITIAL (*fieldlistp) = 0; |
7351 | } | |
813a136d | 7352 | else |
1767a056 | 7353 | fieldlistp = &DECL_CHAIN (*fieldlistp); |
813a136d | 7354 | } |
51ef3909 | 7355 | |
21c8999d | 7356 | /* Now we have the truly final field list. |
7357 | Store it in this type and in the variants. */ | |
51ef3909 | 7358 | |
7359 | TYPE_FIELDS (t) = fieldlist; | |
7360 | ||
860251be | 7361 | /* If there are lots of fields, sort so we can look through them fast. |
8b332087 | 7362 | We arbitrarily consider 16 or more elts to be "a lot". */ |
860251be | 7363 | |
7364 | { | |
7365 | int len = 0; | |
7366 | ||
1767a056 | 7367 | for (x = fieldlist; x; x = DECL_CHAIN (x)) |
860251be | 7368 | { |
a0c938f0 | 7369 | if (len > 15 || DECL_NAME (x) == NULL) |
7370 | break; | |
7371 | len += 1; | |
860251be | 7372 | } |
7373 | ||
7374 | if (len > 15) | |
7375 | { | |
a0c938f0 | 7376 | tree *field_array; |
7377 | struct lang_type *space; | |
7378 | struct sorted_fields_type *space2; | |
d9cf68bf | 7379 | |
a0c938f0 | 7380 | len += list_length (x); |
d9cf68bf | 7381 | |
a0c938f0 | 7382 | /* Use the same allocation policy here that make_node uses, to |
7383 | ensure that this lives as long as the rest of the struct decl. | |
7384 | All decls in an inline function need to be saved. */ | |
d9cf68bf | 7385 | |
ba72912a | 7386 | space = ggc_alloc_cleared_lang_type (sizeof (struct lang_type)); |
7387 | space2 = ggc_alloc_sorted_fields_type | |
7388 | (sizeof (struct sorted_fields_type) + len * sizeof (tree)); | |
d9cf68bf | 7389 | |
a0c938f0 | 7390 | len = 0; |
860251be | 7391 | space->s = space2; |
7392 | field_array = &space2->elts[0]; | |
1767a056 | 7393 | for (x = fieldlist; x; x = DECL_CHAIN (x)) |
a0c938f0 | 7394 | { |
7395 | field_array[len++] = x; | |
7396 | ||
7397 | /* If there is anonymous struct or union, break out of the loop. */ | |
7398 | if (DECL_NAME (x) == NULL) | |
7399 | break; | |
7400 | } | |
7401 | /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */ | |
7402 | if (x == NULL) | |
7403 | { | |
7404 | TYPE_LANG_SPECIFIC (t) = space; | |
7405 | TYPE_LANG_SPECIFIC (t)->s->len = len; | |
7406 | field_array = TYPE_LANG_SPECIFIC (t)->s->elts; | |
7407 | qsort (field_array, len, sizeof (tree), field_decl_cmp); | |
7408 | } | |
860251be | 7409 | } |
7410 | } | |
d9cf68bf | 7411 | |
51ef3909 | 7412 | for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x)) |
7413 | { | |
7414 | TYPE_FIELDS (x) = TYPE_FIELDS (t); | |
7415 | TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t); | |
d8828f55 | 7416 | C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t); |
7417 | C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t); | |
7418 | C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t); | |
51ef3909 | 7419 | } |
7420 | ||
1b170db1 | 7421 | /* If this was supposed to be a transparent union, but we can't |
7422 | make it one, warn and turn off the flag. */ | |
7423 | if (TREE_CODE (t) == UNION_TYPE | |
8df5a43d | 7424 | && TYPE_TRANSPARENT_AGGR (t) |
89dec201 | 7425 | && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))) |
1b170db1 | 7426 | { |
8df5a43d | 7427 | TYPE_TRANSPARENT_AGGR (t) = 0; |
e60a6f7b | 7428 | warning_at (loc, 0, "union cannot be made transparent"); |
1b170db1 | 7429 | } |
7430 | ||
51ef3909 | 7431 | /* If this structure or union completes the type of any previous |
7432 | variable declaration, lay it out and output its rtl. */ | |
3e0a85c2 | 7433 | for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)); |
7434 | x; | |
7435 | x = TREE_CHAIN (x)) | |
51ef3909 | 7436 | { |
3e0a85c2 | 7437 | tree decl = TREE_VALUE (x); |
7438 | if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE) | |
7439 | layout_array_type (TREE_TYPE (decl)); | |
7440 | if (TREE_CODE (decl) != TYPE_DECL) | |
7441 | { | |
7442 | layout_decl (decl, 0); | |
7443 | if (c_dialect_objc ()) | |
7444 | objc_check_decl (decl); | |
b2c4af5e | 7445 | rest_of_decl_compilation (decl, toplevel, 0); |
51ef3909 | 7446 | } |
7447 | } | |
3e0a85c2 | 7448 | C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0; |
51ef3909 | 7449 | |
6e0982ac | 7450 | /* Update type location to the one of the definition, instead of e.g. |
7451 | a forward declaration. */ | |
7452 | if (TYPE_STUB_DECL (t)) | |
7453 | DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc; | |
7454 | ||
51ef3909 | 7455 | /* Finish debugging output for this type. */ |
7456 | rest_of_type_compilation (t, toplevel); | |
7457 | ||
e5f813af | 7458 | /* If we're inside a function proper, i.e. not file-scope and not still |
7459 | parsing parameters, then arrange for the size of a variable sized type | |
7460 | to be bound now. */ | |
cacfdc02 | 7461 | if (building_stmt_list_p () && variably_modified_type_p (t, NULL_TREE)) |
e60a6f7b | 7462 | add_stmt (build_stmt (loc, |
7463 | DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t))); | |
e5f813af | 7464 | |
843bd2fa | 7465 | if (warn_cxx_compat) |
7466 | warn_cxx_compat_finish_struct (fieldlist); | |
0b09525f | 7467 | |
f1f41a6c | 7468 | struct_parse_info->struct_types.release (); |
7469 | struct_parse_info->fields.release (); | |
7470 | struct_parse_info->typedefs_seen.release (); | |
843bd2fa | 7471 | XDELETE (struct_parse_info); |
0b09525f | 7472 | |
843bd2fa | 7473 | struct_parse_info = enclosing_struct_parse_info; |
0b09525f | 7474 | |
7475 | /* If this struct is defined inside a struct, add it to | |
843bd2fa | 7476 | struct_types. */ |
7477 | if (warn_cxx_compat | |
7478 | && struct_parse_info != NULL | |
7479 | && !in_sizeof && !in_typeof && !in_alignof) | |
f1f41a6c | 7480 | struct_parse_info->struct_types.safe_push (t); |
0b09525f | 7481 | |
51ef3909 | 7482 | return t; |
7483 | } | |
7484 | ||
7485 | /* Lay out the type T, and its element type, and so on. */ | |
7486 | ||
7487 | static void | |
1cae46be | 7488 | layout_array_type (tree t) |
51ef3909 | 7489 | { |
7490 | if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE) | |
7491 | layout_array_type (TREE_TYPE (t)); | |
7492 | layout_type (t); | |
7493 | } | |
7494 | \f | |
7495 | /* Begin compiling the definition of an enumeration type. | |
7496 | NAME is its name (or null if anonymous). | |
e60a6f7b | 7497 | LOC is the enum's location. |
51ef3909 | 7498 | Returns the type object, as yet incomplete. |
7499 | Also records info about it so that build_enumerator | |
7500 | may be used to declare the individual values as they are read. */ | |
7501 | ||
7502 | tree | |
e60a6f7b | 7503 | start_enum (location_t loc, struct c_enum_contents *the_enum, tree name) |
51ef3909 | 7504 | { |
0b09525f | 7505 | tree enumtype = NULL_TREE; |
7506 | location_t enumloc = UNKNOWN_LOCATION; | |
51ef3909 | 7507 | |
7508 | /* If this is the real definition for a previous forward reference, | |
7509 | fill in the contents in the same object that used to be the | |
7510 | forward reference. */ | |
7511 | ||
0b09525f | 7512 | if (name != NULL_TREE) |
7513 | enumtype = lookup_tag (ENUMERAL_TYPE, name, 1, &enumloc); | |
51ef3909 | 7514 | |
7515 | if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE) | |
7516 | { | |
7517 | enumtype = make_node (ENUMERAL_TYPE); | |
e60a6f7b | 7518 | pushtag (loc, name, enumtype); |
51ef3909 | 7519 | } |
7520 | ||
5dad28f1 | 7521 | if (C_TYPE_BEING_DEFINED (enumtype)) |
0b09525f | 7522 | error_at (loc, "nested redefinition of %<enum %E%>", name); |
5dad28f1 | 7523 | |
51ef3909 | 7524 | C_TYPE_BEING_DEFINED (enumtype) = 1; |
7525 | ||
7526 | if (TYPE_VALUES (enumtype) != 0) | |
7527 | { | |
7528 | /* This enum is a named one that has been declared already. */ | |
0b09525f | 7529 | error_at (loc, "redeclaration of %<enum %E%>", name); |
7530 | if (enumloc != UNKNOWN_LOCATION) | |
7531 | inform (enumloc, "originally defined here"); | |
51ef3909 | 7532 | |
7533 | /* Completely replace its old definition. | |
7534 | The old enumerators remain defined, however. */ | |
7535 | TYPE_VALUES (enumtype) = 0; | |
7536 | } | |
7537 | ||
13c7079e | 7538 | the_enum->enum_next_value = integer_zero_node; |
7539 | the_enum->enum_overflow = 0; | |
51ef3909 | 7540 | |
93aaccf8 | 7541 | if (flag_short_enums) |
7542 | TYPE_PACKED (enumtype) = 1; | |
7543 | ||
0b09525f | 7544 | /* FIXME: This will issue a warning for a use of a type defined |
7545 | within sizeof in a statement expr. This is not terribly serious | |
7546 | as C++ doesn't permit statement exprs within sizeof anyhow. */ | |
7547 | if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof)) | |
7548 | warning_at (loc, OPT_Wc___compat, | |
7549 | "defining type in %qs expression is invalid in C++", | |
7550 | (in_sizeof | |
7551 | ? "sizeof" | |
7552 | : (in_typeof ? "typeof" : "alignof"))); | |
7553 | ||
51ef3909 | 7554 | return enumtype; |
7555 | } | |
7556 | ||
7557 | /* After processing and defining all the values of an enumeration type, | |
7558 | install their decls in the enumeration type and finish it off. | |
92b4910b | 7559 | ENUMTYPE is the type object, VALUES a list of decl-value pairs, |
7560 | and ATTRIBUTES are the specified attributes. | |
51ef3909 | 7561 | Returns ENUMTYPE. */ |
7562 | ||
7563 | tree | |
1cae46be | 7564 | finish_enum (tree enumtype, tree values, tree attributes) |
51ef3909 | 7565 | { |
19cb6b50 | 7566 | tree pair, tem; |
4ee9c684 | 7567 | tree minnode = 0, maxnode = 0; |
dcf6eb8b | 7568 | int precision, unsign; |
393b349a | 7569 | bool toplevel = (file_scope == current_scope); |
4ee9c684 | 7570 | struct lang_type *lt; |
51ef3909 | 7571 | |
e3c541f0 | 7572 | decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); |
92b4910b | 7573 | |
51ef3909 | 7574 | /* Calculate the maximum value of any enumerator in this type. */ |
7575 | ||
cbf39c1f | 7576 | if (values == error_mark_node) |
7577 | minnode = maxnode = integer_zero_node; | |
7578 | else | |
8b2f77e7 | 7579 | { |
dcf6eb8b | 7580 | minnode = maxnode = TREE_VALUE (values); |
7581 | for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair)) | |
8b2f77e7 | 7582 | { |
dcf6eb8b | 7583 | tree value = TREE_VALUE (pair); |
7584 | if (tree_int_cst_lt (maxnode, value)) | |
7585 | maxnode = value; | |
7586 | if (tree_int_cst_lt (value, minnode)) | |
7587 | minnode = value; | |
8b2f77e7 | 7588 | } |
dcf6eb8b | 7589 | } |
8b2f77e7 | 7590 | |
dcf6eb8b | 7591 | /* Construct the final type of this enumeration. It is the same |
7592 | as one of the integral types - the narrowest one that fits, except | |
7593 | that normally we only go as narrow as int - and signed iff any of | |
7594 | the values are negative. */ | |
7595 | unsign = (tree_int_cst_sgn (minnode) >= 0); | |
5485b959 | 7596 | precision = MAX (tree_int_cst_min_precision (minnode, unsign), |
7597 | tree_int_cst_min_precision (maxnode, unsign)); | |
3a648ab9 | 7598 | |
f219fbbf | 7599 | if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node)) |
dcf6eb8b | 7600 | { |
4ee9c684 | 7601 | tem = c_common_type_for_size (precision, unsign); |
7602 | if (tem == NULL) | |
f219fbbf | 7603 | { |
c3ceba8e | 7604 | warning (0, "enumeration values exceed range of largest integer"); |
4ee9c684 | 7605 | tem = long_long_integer_type_node; |
f219fbbf | 7606 | } |
8b2f77e7 | 7607 | } |
f219fbbf | 7608 | else |
4ee9c684 | 7609 | tem = unsign ? unsigned_type_node : integer_type_node; |
c1838b2a | 7610 | |
4ee9c684 | 7611 | TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem); |
7612 | TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem); | |
4ee9c684 | 7613 | TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem); |
51ef3909 | 7614 | TYPE_SIZE (enumtype) = 0; |
3a648ab9 | 7615 | |
7616 | /* If the precision of the type was specific with an attribute and it | |
7617 | was too small, give an error. Otherwise, use it. */ | |
7618 | if (TYPE_PRECISION (enumtype)) | |
7619 | { | |
7620 | if (precision > TYPE_PRECISION (enumtype)) | |
7621 | error ("specified mode too small for enumeral values"); | |
7622 | } | |
7623 | else | |
7624 | TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem); | |
7625 | ||
51ef3909 | 7626 | layout_type (enumtype); |
7627 | ||
cbf39c1f | 7628 | if (values != error_mark_node) |
a7925e0c | 7629 | { |
dcf6eb8b | 7630 | /* Change the type of the enumerators to be the enum type. We |
7631 | need to do this irrespective of the size of the enum, for | |
7632 | proper type checking. Replace the DECL_INITIALs of the | |
7633 | enumerators, and the value slots of the list, with copies | |
7634 | that have the enum type; they cannot be modified in place | |
7635 | because they may be shared (e.g. integer_zero_node) Finally, | |
7636 | change the purpose slots to point to the names of the decls. */ | |
cbf39c1f | 7637 | for (pair = values; pair; pair = TREE_CHAIN (pair)) |
7638 | { | |
dcf6eb8b | 7639 | tree enu = TREE_PURPOSE (pair); |
4ee9c684 | 7640 | tree ini = DECL_INITIAL (enu); |
51ef3909 | 7641 | |
dcf6eb8b | 7642 | TREE_TYPE (enu) = enumtype; |
c1838b2a | 7643 | |
7644 | /* The ISO C Standard mandates enumerators to have type int, | |
7645 | even though the underlying type of an enum type is | |
e8fc0d34 | 7646 | unspecified. However, GCC allows enumerators of any |
9fe4fa50 | 7647 | integer type as an extensions. build_enumerator() |
7648 | converts any enumerators that fit in an int to type int, | |
7649 | to avoid promotions to unsigned types when comparing | |
7650 | integers with enumerators that fit in the int range. | |
7651 | When -pedantic is given, build_enumerator() would have | |
7652 | already warned about those that don't fit. Here we | |
7653 | convert the rest to the enumerator type. */ | |
7654 | if (TREE_TYPE (ini) != integer_type_node) | |
7655 | ini = convert (enumtype, ini); | |
dcf6eb8b | 7656 | |
4ee9c684 | 7657 | DECL_INITIAL (enu) = ini; |
dcf6eb8b | 7658 | TREE_PURPOSE (pair) = DECL_NAME (enu); |
4ee9c684 | 7659 | TREE_VALUE (pair) = ini; |
dcf6eb8b | 7660 | } |
51ef3909 | 7661 | |
cbf39c1f | 7662 | TYPE_VALUES (enumtype) = values; |
7663 | } | |
51ef3909 | 7664 | |
4ee9c684 | 7665 | /* Record the min/max values so that we can warn about bit-field |
7666 | enumerations that are too small for the values. */ | |
ba72912a | 7667 | lt = ggc_alloc_cleared_lang_type (sizeof (struct lang_type)); |
4ee9c684 | 7668 | lt->enum_min = minnode; |
7669 | lt->enum_max = maxnode; | |
7670 | TYPE_LANG_SPECIFIC (enumtype) = lt; | |
7671 | ||
b97ea329 | 7672 | /* Fix up all variant types of this enum type. */ |
7673 | for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem)) | |
7674 | { | |
dcf6eb8b | 7675 | if (tem == enumtype) |
7676 | continue; | |
b97ea329 | 7677 | TYPE_VALUES (tem) = TYPE_VALUES (enumtype); |
7678 | TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype); | |
7679 | TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype); | |
7680 | TYPE_SIZE (tem) = TYPE_SIZE (enumtype); | |
24a7e611 | 7681 | TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype); |
342ad2d6 | 7682 | SET_TYPE_MODE (tem, TYPE_MODE (enumtype)); |
b97ea329 | 7683 | TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype); |
7684 | TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype); | |
aca14577 | 7685 | TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype); |
78a8ed03 | 7686 | TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype); |
4ee9c684 | 7687 | TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype); |
b97ea329 | 7688 | } |
7689 | ||
51ef3909 | 7690 | /* Finish debugging output for this type. */ |
7691 | rest_of_type_compilation (enumtype, toplevel); | |
7692 | ||
0b09525f | 7693 | /* If this enum is defined inside a struct, add it to |
843bd2fa | 7694 | struct_types. */ |
7695 | if (warn_cxx_compat | |
7696 | && struct_parse_info != NULL | |
7697 | && !in_sizeof && !in_typeof && !in_alignof) | |
f1f41a6c | 7698 | struct_parse_info->struct_types.safe_push (enumtype); |
0b09525f | 7699 | |
51ef3909 | 7700 | return enumtype; |
7701 | } | |
7702 | ||
7703 | /* Build and install a CONST_DECL for one value of the | |
7704 | current enumeration type (one that was begun with start_enum). | |
5a7ce2ec | 7705 | DECL_LOC is the location of the enumerator. |
7706 | LOC is the location of the '=' operator if any, DECL_LOC otherwise. | |
51ef3909 | 7707 | Return a tree-list containing the CONST_DECL and its value. |
7708 | Assignment of sequential values by default is handled here. */ | |
7709 | ||
7710 | tree | |
5a7ce2ec | 7711 | build_enumerator (location_t decl_loc, location_t loc, |
e60a6f7b | 7712 | struct c_enum_contents *the_enum, tree name, tree value) |
51ef3909 | 7713 | { |
19cb6b50 | 7714 | tree decl, type; |
51ef3909 | 7715 | |
7716 | /* Validate and default VALUE. */ | |
7717 | ||
ad5a5207 | 7718 | if (value != 0) |
d645d7e9 | 7719 | { |
393b349a | 7720 | /* Don't issue more errors for error_mark_node (i.e. an |
7721 | undeclared identifier) - just ignore the value expression. */ | |
7722 | if (value == error_mark_node) | |
7723 | value = 0; | |
bcb531e5 | 7724 | else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))) |
3b7bdb26 | 7725 | { |
e60a6f7b | 7726 | error_at (loc, "enumerator value for %qE is not an integer constant", |
7727 | name); | |
393b349a | 7728 | value = 0; |
3b7bdb26 | 7729 | } |
d645d7e9 | 7730 | else |
7731 | { | |
bcb531e5 | 7732 | if (TREE_CODE (value) != INTEGER_CST) |
7733 | { | |
7734 | value = c_fully_fold (value, false, NULL); | |
7735 | if (TREE_CODE (value) == INTEGER_CST) | |
29438999 | 7736 | pedwarn (loc, OPT_Wpedantic, |
bcb531e5 | 7737 | "enumerator value for %qE is not an integer " |
7738 | "constant expression", name); | |
7739 | } | |
7740 | if (TREE_CODE (value) != INTEGER_CST) | |
7741 | { | |
7742 | error ("enumerator value for %qE is not an integer constant", | |
7743 | name); | |
7744 | value = 0; | |
7745 | } | |
7746 | else | |
7747 | { | |
7748 | value = default_conversion (value); | |
7749 | constant_expression_warning (value); | |
7750 | } | |
d645d7e9 | 7751 | } |
7752 | } | |
51ef3909 | 7753 | |
7754 | /* Default based on previous value. */ | |
7755 | /* It should no longer be possible to have NON_LVALUE_EXPR | |
7756 | in the default. */ | |
7757 | if (value == 0) | |
88c7c4d5 | 7758 | { |
13c7079e | 7759 | value = the_enum->enum_next_value; |
7760 | if (the_enum->enum_overflow) | |
e60a6f7b | 7761 | error_at (loc, "overflow in enumeration values"); |
88c7c4d5 | 7762 | } |
e8fc0d34 | 7763 | /* Even though the underlying type of an enum is unspecified, the |
7764 | type of enumeration constants is explicitly defined as int | |
7765 | (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as | |
7766 | an extension. */ | |
7767 | else if (!int_fits_type_p (value, integer_type_node)) | |
29438999 | 7768 | pedwarn (loc, OPT_Wpedantic, |
21ca8540 | 7769 | "ISO C restricts enumerator values to range of %<int%>"); |
51ef3909 | 7770 | |
9fe4fa50 | 7771 | /* The ISO C Standard mandates enumerators to have type int, even |
7772 | though the underlying type of an enum type is unspecified. | |
7773 | However, GCC allows enumerators of any integer type as an | |
7774 | extensions. Here we convert any enumerators that fit in an int | |
7775 | to type int, to avoid promotions to unsigned types when comparing | |
7776 | integers with enumerators that fit in the int range. When | |
7777 | -pedantic is given, we would have already warned about those that | |
7778 | don't fit. We have to do this here rather than in finish_enum | |
7779 | because this value may be used to define more enumerators. */ | |
7780 | if (int_fits_type_p (value, integer_type_node)) | |
7781 | value = convert (integer_type_node, value); | |
7782 | ||
51ef3909 | 7783 | /* Set basis for default for next value. */ |
8e70fb09 | 7784 | the_enum->enum_next_value |
8637f1db | 7785 | = build_binary_op (EXPR_LOC_OR_HERE (value), |
7786 | PLUS_EXPR, value, integer_one_node, 0); | |
13c7079e | 7787 | the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value); |
51ef3909 | 7788 | |
7789 | /* Now create a declaration for the enum value name. */ | |
7790 | ||
a7925e0c | 7791 | type = TREE_TYPE (value); |
771d21fa | 7792 | type = c_common_type_for_size (MAX (TYPE_PRECISION (type), |
7793 | TYPE_PRECISION (integer_type_node)), | |
7794 | (TYPE_PRECISION (type) | |
7795 | >= TYPE_PRECISION (integer_type_node) | |
78a8ed03 | 7796 | && TYPE_UNSIGNED (type))); |
a7925e0c | 7797 | |
5a7ce2ec | 7798 | decl = build_decl (decl_loc, CONST_DECL, name, type); |
79efd58a | 7799 | DECL_INITIAL (decl) = convert (type, value); |
51ef3909 | 7800 | pushdecl (decl); |
7801 | ||
f8b540f2 | 7802 | return tree_cons (decl, value, NULL_TREE); |
51ef3909 | 7803 | } |
e41f0d80 | 7804 | |
51ef3909 | 7805 | \f |
7806 | /* Create the FUNCTION_DECL for a function definition. | |
b1d10e93 | 7807 | DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of |
e62f363b | 7808 | the declaration; they describe the function's name and the type it returns, |
51ef3909 | 7809 | but twisted together in a fashion that parallels the syntax of C. |
7810 | ||
7811 | This function creates a binding context for the function body | |
7812 | as well as setting up the FUNCTION_DECL in current_function_decl. | |
7813 | ||
7814 | Returns 1 on success. If the DECLARATOR is not suitable for a function | |
7815 | (it defines a datum instead), we return 0, which tells | |
f8b540f2 | 7816 | yyparse to report a parse error. */ |
51ef3909 | 7817 | |
7818 | int | |
9553111d | 7819 | start_function (struct c_declspecs *declspecs, struct c_declarator *declarator, |
ac206aff | 7820 | tree attributes) |
51ef3909 | 7821 | { |
7822 | tree decl1, old_decl; | |
540edea7 | 7823 | tree restype, resdecl; |
e60a6f7b | 7824 | location_t loc; |
51ef3909 | 7825 | |
a92771b8 | 7826 | current_function_returns_value = 0; /* Assume, until we see it does. */ |
51ef3909 | 7827 | current_function_returns_null = 0; |
af857942 | 7828 | current_function_returns_abnormally = 0; |
51ef3909 | 7829 | warn_about_return_type = 0; |
0375a275 | 7830 | c_switch_stack = NULL; |
7831 | ||
7832 | /* Indicate no valid break/continue context by setting these variables | |
7833 | to some non-null, non-label value. We'll notice and emit the proper | |
7834 | error message in c_finish_bc_stmt. */ | |
7835 | c_break_label = c_cont_label = size_zero_node; | |
51ef3909 | 7836 | |
81f218ec | 7837 | decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL, |
a75b1c71 | 7838 | &attributes, NULL, NULL, DEPRECATED_NORMAL); |
51ef3909 | 7839 | |
7840 | /* If the declarator is not suitable for a function definition, | |
7841 | cause a syntax error. */ | |
6b9c4a52 | 7842 | if (decl1 == 0 |
7843 | || TREE_CODE (decl1) != FUNCTION_DECL) | |
f805d53d | 7844 | return 0; |
51ef3909 | 7845 | |
e60a6f7b | 7846 | loc = DECL_SOURCE_LOCATION (decl1); |
7847 | ||
bc7bff74 | 7848 | c_decl_attributes (&decl1, attributes, 0); |
82656fbf | 7849 | |
93f10b04 | 7850 | if (DECL_DECLARED_INLINE_P (decl1) |
7851 | && DECL_UNINLINABLE (decl1) | |
7852 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1))) | |
e60a6f7b | 7853 | warning_at (loc, OPT_Wattributes, |
7854 | "inline function %qD given attribute noinline", | |
7855 | decl1); | |
93f10b04 | 7856 | |
541e4101 | 7857 | /* Handle gnu_inline attribute. */ |
7858 | if (declspecs->inline_p | |
11950bdd | 7859 | && !flag_gnu89_inline |
541e4101 | 7860 | && TREE_CODE (decl1) == FUNCTION_DECL |
56f06eef | 7861 | && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1)) |
7862 | || current_function_decl)) | |
541e4101 | 7863 | { |
7864 | if (declspecs->storage_class != csc_static) | |
7865 | DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1); | |
7866 | } | |
541e4101 | 7867 | |
51ef3909 | 7868 | announce_function (decl1); |
7869 | ||
4b72716d | 7870 | if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1)))) |
51ef3909 | 7871 | { |
e60a6f7b | 7872 | error_at (loc, "return type is an incomplete type"); |
51ef3909 | 7873 | /* Make it return void instead. */ |
7874 | TREE_TYPE (decl1) | |
7875 | = build_function_type (void_type_node, | |
7876 | TYPE_ARG_TYPES (TREE_TYPE (decl1))); | |
7877 | } | |
7878 | ||
7879 | if (warn_about_return_type) | |
48e1416a | 7880 | pedwarn_c99 (loc, flag_isoc99 ? 0 |
8864917d | 7881 | : (warn_return_type ? OPT_Wreturn_type : OPT_Wimplicit_int), |
7882 | "return type defaults to %<int%>"); | |
51ef3909 | 7883 | |
51ef3909 | 7884 | /* Make the init_value nonzero so pushdecl knows this is not tentative. |
393b349a | 7885 | error_mark_node is replaced below (in pop_scope) with the BLOCK. */ |
51ef3909 | 7886 | DECL_INITIAL (decl1) = error_mark_node; |
7887 | ||
15f85477 | 7888 | /* A nested function is not global. */ |
7889 | if (current_function_decl != 0) | |
7890 | TREE_PUBLIC (decl1) = 0; | |
7891 | ||
51ef3909 | 7892 | /* If this definition isn't a prototype and we had a prototype declaration |
81506bec | 7893 | before, copy the arg type info from that prototype. */ |
393b349a | 7894 | old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope); |
4d5ac30e | 7895 | if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL) |
7896 | old_decl = 0; | |
3eafcdb5 | 7897 | current_function_prototype_locus = UNKNOWN_LOCATION; |
7898 | current_function_prototype_built_in = false; | |
7899 | current_function_prototype_arg_types = NULL_TREE; | |
a36cf284 | 7900 | if (!prototype_p (TREE_TYPE (decl1))) |
3eafcdb5 | 7901 | { |
7902 | if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE | |
7903 | && comptypes (TREE_TYPE (TREE_TYPE (decl1)), | |
7904 | TREE_TYPE (TREE_TYPE (old_decl)))) | |
7905 | { | |
7906 | TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl), | |
7907 | TREE_TYPE (decl1)); | |
7908 | current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl); | |
7909 | current_function_prototype_built_in | |
7910 | = C_DECL_BUILTIN_PROTOTYPE (old_decl); | |
7911 | current_function_prototype_arg_types | |
7912 | = TYPE_ARG_TYPES (TREE_TYPE (decl1)); | |
7913 | } | |
7914 | if (TREE_PUBLIC (decl1)) | |
7915 | { | |
7916 | /* If there is an external prototype declaration of this | |
7917 | function, record its location but do not copy information | |
7918 | to this decl. This may be an invisible declaration | |
7919 | (built-in or in a scope which has finished) or simply | |
7920 | have more refined argument types than any declaration | |
7921 | found above. */ | |
7922 | struct c_binding *b; | |
7923 | for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed) | |
7924 | if (B_IN_SCOPE (b, external_scope)) | |
7925 | break; | |
7926 | if (b) | |
7927 | { | |
7928 | tree ext_decl, ext_type; | |
7929 | ext_decl = b->decl; | |
f805d53d | 7930 | ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl); |
3eafcdb5 | 7931 | if (TREE_CODE (ext_type) == FUNCTION_TYPE |
7932 | && comptypes (TREE_TYPE (TREE_TYPE (decl1)), | |
7933 | TREE_TYPE (ext_type))) | |
7934 | { | |
7935 | current_function_prototype_locus | |
7936 | = DECL_SOURCE_LOCATION (ext_decl); | |
7937 | current_function_prototype_built_in | |
7938 | = C_DECL_BUILTIN_PROTOTYPE (ext_decl); | |
7939 | current_function_prototype_arg_types | |
7940 | = TYPE_ARG_TYPES (ext_type); | |
7941 | } | |
7942 | } | |
7943 | } | |
06460bd1 | 7944 | } |
51ef3909 | 7945 | |
7946 | /* Optionally warn of old-fashioned def with no previous prototype. */ | |
7947 | if (warn_strict_prototypes | |
494fc9d0 | 7948 | && old_decl != error_mark_node |
a36cf284 | 7949 | && !prototype_p (TREE_TYPE (decl1)) |
31ddae9f | 7950 | && C_DECL_ISNT_PROTOTYPE (old_decl)) |
e60a6f7b | 7951 | warning_at (loc, OPT_Wstrict_prototypes, |
7952 | "function declaration isn%'t a prototype"); | |
51ef3909 | 7953 | /* Optionally warn of any global def with no previous prototype. */ |
7954 | else if (warn_missing_prototypes | |
494fc9d0 | 7955 | && old_decl != error_mark_node |
51ef3909 | 7956 | && TREE_PUBLIC (decl1) |
84166705 | 7957 | && !MAIN_NAME_P (DECL_NAME (decl1)) |
31ddae9f | 7958 | && C_DECL_ISNT_PROTOTYPE (old_decl)) |
e60a6f7b | 7959 | warning_at (loc, OPT_Wmissing_prototypes, |
7960 | "no previous prototype for %qD", decl1); | |
51ef3909 | 7961 | /* Optionally warn of any def with no previous prototype |
7962 | if the function has already been used. */ | |
7963 | else if (warn_missing_prototypes | |
494fc9d0 | 7964 | && old_decl != 0 |
7965 | && old_decl != error_mark_node | |
7966 | && TREE_USED (old_decl) | |
a36cf284 | 7967 | && !prototype_p (TREE_TYPE (old_decl))) |
e60a6f7b | 7968 | warning_at (loc, OPT_Wmissing_prototypes, |
7969 | "%qD was used with no prototype before its definition", decl1); | |
230c3e29 | 7970 | /* Optionally warn of any global def with no previous declaration. */ |
7971 | else if (warn_missing_declarations | |
7972 | && TREE_PUBLIC (decl1) | |
7973 | && old_decl == 0 | |
84166705 | 7974 | && !MAIN_NAME_P (DECL_NAME (decl1))) |
e60a6f7b | 7975 | warning_at (loc, OPT_Wmissing_declarations, |
7976 | "no previous declaration for %qD", | |
7977 | decl1); | |
230c3e29 | 7978 | /* Optionally warn of any def with no previous declaration |
7979 | if the function has already been used. */ | |
7980 | else if (warn_missing_declarations | |
494fc9d0 | 7981 | && old_decl != 0 |
7982 | && old_decl != error_mark_node | |
7983 | && TREE_USED (old_decl) | |
31ddae9f | 7984 | && C_DECL_IMPLICIT (old_decl)) |
e60a6f7b | 7985 | warning_at (loc, OPT_Wmissing_declarations, |
7986 | "%qD was used with no declaration before its definition", decl1); | |
51ef3909 | 7987 | |
51ef3909 | 7988 | /* This function exists in static storage. |
7989 | (This does not mean `static' in the C sense!) */ | |
7990 | TREE_STATIC (decl1) = 1; | |
7991 | ||
418089c3 | 7992 | /* This is the earliest point at which we might know the assembler |
7993 | name of the function. Thus, if it's set before this, die horribly. */ | |
231bd014 | 7994 | gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1)); |
418089c3 | 7995 | |
7996 | /* If #pragma weak was used, mark the decl weak now. */ | |
393b349a | 7997 | if (current_scope == file_scope) |
418089c3 | 7998 | maybe_apply_pragma_weak (decl1); |
7999 | ||
4214af46 | 8000 | /* Warn for unlikely, improbable, or stupid declarations of `main'. */ |
23efcc02 | 8001 | if (warn_main && MAIN_NAME_P (DECL_NAME (decl1))) |
869a2569 | 8002 | { |
869a2569 | 8003 | if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1))) |
4214af46 | 8004 | != integer_type_node) |
e60a6f7b | 8005 | pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1); |
869a2569 | 8006 | |
23efcc02 | 8007 | check_main_parameter_types (decl1); |
869a2569 | 8008 | |
84166705 | 8009 | if (!TREE_PUBLIC (decl1)) |
e60a6f7b | 8010 | pedwarn (loc, OPT_Wmain, |
8011 | "%qD is normally a non-static function", decl1); | |
869a2569 | 8012 | } |
8013 | ||
51ef3909 | 8014 | /* Record the decl so that the function name is defined. |
8015 | If we already have a decl for this name, and it is a FUNCTION_DECL, | |
8016 | use the old decl. */ | |
8017 | ||
8018 | current_function_decl = pushdecl (decl1); | |
8019 | ||
393b349a | 8020 | push_scope (); |
2b652cf3 | 8021 | declare_parm_level (); |
51ef3909 | 8022 | |
51ef3909 | 8023 | restype = TREE_TYPE (TREE_TYPE (current_function_decl)); |
e60a6f7b | 8024 | resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype); |
540edea7 | 8025 | DECL_ARTIFICIAL (resdecl) = 1; |
8026 | DECL_IGNORED_P (resdecl) = 1; | |
8027 | DECL_RESULT (current_function_decl) = resdecl; | |
51ef3909 | 8028 | |
65b7f83f | 8029 | start_fname_decls (); |
1cae46be | 8030 | |
51ef3909 | 8031 | return 1; |
8032 | } | |
51ef3909 | 8033 | \f |
c917d901 | 8034 | /* Subroutine of store_parm_decls which handles new-style function |
8035 | definitions (prototype format). The parms already have decls, so we | |
8036 | need only record them as in effect and complain if any redundant | |
8037 | old-style parm decls were written. */ | |
38401f3c | 8038 | static void |
ac206aff | 8039 | store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info) |
51ef3909 | 8040 | { |
393b349a | 8041 | tree decl; |
9d61f04b | 8042 | c_arg_tag *tag; |
8043 | unsigned ix; | |
51ef3909 | 8044 | |
393b349a | 8045 | if (current_scope->bindings) |
c917d901 | 8046 | { |
712d2297 | 8047 | error_at (DECL_SOURCE_LOCATION (fndecl), |
8048 | "old-style parameter declarations in prototyped " | |
8049 | "function definition"); | |
51ef3909 | 8050 | |
c917d901 | 8051 | /* Get rid of the old-style declarations. */ |
393b349a | 8052 | pop_scope (); |
8053 | push_scope (); | |
8054 | } | |
8055 | /* Don't issue this warning for nested functions, and don't issue this | |
8056 | warning if we got here because ARG_INFO_TYPES was error_mark_node | |
8057 | (this happens when a function definition has just an ellipsis in | |
8058 | its parameter list). */ | |
6bf97f82 | 8059 | else if (!in_system_header && !current_function_scope |
ac206aff | 8060 | && arg_info->types != error_mark_node) |
712d2297 | 8061 | warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional, |
8062 | "traditional C rejects ISO C style function definitions"); | |
51ef3909 | 8063 | |
f74be9a1 | 8064 | /* Now make all the parameter declarations visible in the function body. |
8065 | We can bypass most of the grunt work of pushdecl. */ | |
1767a056 | 8066 | for (decl = arg_info->parms; decl; decl = DECL_CHAIN (decl)) |
c917d901 | 8067 | { |
f74be9a1 | 8068 | DECL_CONTEXT (decl) = current_function_decl; |
393b349a | 8069 | if (DECL_NAME (decl)) |
40c4b476 | 8070 | { |
8071 | bind (DECL_NAME (decl), decl, current_scope, | |
6fb80942 | 8072 | /*invisible=*/false, /*nested=*/false, |
8073 | UNKNOWN_LOCATION); | |
40c4b476 | 8074 | if (!TREE_USED (decl)) |
8075 | warn_if_shadowing (decl); | |
8076 | } | |
c917d901 | 8077 | else |
712d2297 | 8078 | error_at (DECL_SOURCE_LOCATION (decl), "parameter name omitted"); |
c917d901 | 8079 | } |
5f3cead1 | 8080 | |
c917d901 | 8081 | /* Record the parameter list in the function declaration. */ |
ac206aff | 8082 | DECL_ARGUMENTS (fndecl) = arg_info->parms; |
51ef3909 | 8083 | |
c917d901 | 8084 | /* Now make all the ancillary declarations visible, likewise. */ |
1767a056 | 8085 | for (decl = arg_info->others; decl; decl = DECL_CHAIN (decl)) |
f74be9a1 | 8086 | { |
8087 | DECL_CONTEXT (decl) = current_function_decl; | |
393b349a | 8088 | if (DECL_NAME (decl)) |
4194491a | 8089 | bind (DECL_NAME (decl), decl, current_scope, |
1799fbab | 8090 | /*invisible=*/false, |
8091 | /*nested=*/(TREE_CODE (decl) == FUNCTION_DECL), | |
8092 | UNKNOWN_LOCATION); | |
f74be9a1 | 8093 | } |
5f3cead1 | 8094 | |
c917d901 | 8095 | /* And all the tag declarations. */ |
f1f41a6c | 8096 | FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info->tags, ix, tag) |
9d61f04b | 8097 | if (tag->id) |
8098 | bind (tag->id, tag->type, current_scope, | |
6fb80942 | 8099 | /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION); |
c917d901 | 8100 | } |
ce467a73 | 8101 | |
c917d901 | 8102 | /* Subroutine of store_parm_decls which handles old-style function |
8103 | definitions (separate parameter list and declarations). */ | |
51ef3909 | 8104 | |
c917d901 | 8105 | static void |
ac206aff | 8106 | store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info) |
c917d901 | 8107 | { |
393b349a | 8108 | struct c_binding *b; |
f74be9a1 | 8109 | tree parm, decl, last; |
ac206aff | 8110 | tree parmids = arg_info->parms; |
5ded8c6f | 8111 | struct pointer_set_t *seen_args = pointer_set_create (); |
c917d901 | 8112 | |
efb9d9ee | 8113 | if (!in_system_header) |
e60a6f7b | 8114 | warning_at (DECL_SOURCE_LOCATION (fndecl), |
8115 | OPT_Wold_style_definition, "old-style function definition"); | |
393b349a | 8116 | |
c917d901 | 8117 | /* Match each formal parameter name with its declaration. Save each |
8118 | decl in the appropriate TREE_PURPOSE slot of the parmids chain. */ | |
8119 | for (parm = parmids; parm; parm = TREE_CHAIN (parm)) | |
8120 | { | |
8121 | if (TREE_VALUE (parm) == 0) | |
9c316e51 | 8122 | { |
e60a6f7b | 8123 | error_at (DECL_SOURCE_LOCATION (fndecl), |
8124 | "parameter name missing from parameter list"); | |
c917d901 | 8125 | TREE_PURPOSE (parm) = 0; |
8126 | continue; | |
9c316e51 | 8127 | } |
51ef3909 | 8128 | |
393b349a | 8129 | b = I_SYMBOL_BINDING (TREE_VALUE (parm)); |
4194491a | 8130 | if (b && B_IN_CURRENT_SCOPE (b)) |
51ef3909 | 8131 | { |
393b349a | 8132 | decl = b->decl; |
0a4efe82 | 8133 | /* Skip erroneous parameters. */ |
8134 | if (decl == error_mark_node) | |
8135 | continue; | |
c917d901 | 8136 | /* If we got something other than a PARM_DECL it is an error. */ |
8137 | if (TREE_CODE (decl) != PARM_DECL) | |
e60a6f7b | 8138 | error_at (DECL_SOURCE_LOCATION (decl), |
8139 | "%qD declared as a non-parameter", decl); | |
c917d901 | 8140 | /* If the declaration is already marked, we have a duplicate |
8141 | name. Complain and ignore the duplicate. */ | |
5ded8c6f | 8142 | else if (pointer_set_contains (seen_args, decl)) |
51ef3909 | 8143 | { |
e60a6f7b | 8144 | error_at (DECL_SOURCE_LOCATION (decl), |
8145 | "multiple parameters named %qD", decl); | |
c917d901 | 8146 | TREE_PURPOSE (parm) = 0; |
8147 | continue; | |
51ef3909 | 8148 | } |
c917d901 | 8149 | /* If the declaration says "void", complain and turn it into |
8150 | an int. */ | |
8151 | else if (VOID_TYPE_P (TREE_TYPE (decl))) | |
51ef3909 | 8152 | { |
e60a6f7b | 8153 | error_at (DECL_SOURCE_LOCATION (decl), |
8154 | "parameter %qD declared with void type", decl); | |
c917d901 | 8155 | TREE_TYPE (decl) = integer_type_node; |
8156 | DECL_ARG_TYPE (decl) = integer_type_node; | |
8157 | layout_decl (decl, 0); | |
51ef3909 | 8158 | } |
40c4b476 | 8159 | warn_if_shadowing (decl); |
51ef3909 | 8160 | } |
c917d901 | 8161 | /* If no declaration found, default to int. */ |
8162 | else | |
51ef3909 | 8163 | { |
e60a6f7b | 8164 | /* FIXME diagnostics: This should be the location of the argument, |
8165 | not the FNDECL. E.g., for an old-style declaration | |
8166 | ||
8167 | int f10(v) { blah; } | |
8168 | ||
8169 | We should use the location of the V, not the F10. | |
8170 | Unfortunately, the V is an IDENTIFIER_NODE which has no | |
8171 | location. In the future we need locations for c_arg_info | |
8172 | entries. | |
8173 | ||
8174 | See gcc.dg/Wshadow-3.c for an example of this problem. */ | |
8175 | decl = build_decl (DECL_SOURCE_LOCATION (fndecl), | |
8176 | PARM_DECL, TREE_VALUE (parm), integer_type_node); | |
c917d901 | 8177 | DECL_ARG_TYPE (decl) = TREE_TYPE (decl); |
c917d901 | 8178 | pushdecl (decl); |
40c4b476 | 8179 | warn_if_shadowing (decl); |
c917d901 | 8180 | |
8181 | if (flag_isoc99) | |
e60a6f7b | 8182 | pedwarn (DECL_SOURCE_LOCATION (decl), |
8183 | 0, "type of %qD defaults to %<int%>", decl); | |
48e1416a | 8184 | else |
e60a6f7b | 8185 | warning_at (DECL_SOURCE_LOCATION (decl), |
8186 | OPT_Wmissing_parameter_type, | |
8187 | "type of %qD defaults to %<int%>", decl); | |
51ef3909 | 8188 | } |
8189 | ||
c917d901 | 8190 | TREE_PURPOSE (parm) = decl; |
5ded8c6f | 8191 | pointer_set_insert (seen_args, decl); |
51ef3909 | 8192 | } |
51ef3909 | 8193 | |
f74be9a1 | 8194 | /* Now examine the parms chain for incomplete declarations |
8195 | and declarations with no corresponding names. */ | |
51ef3909 | 8196 | |
393b349a | 8197 | for (b = current_scope->bindings; b; b = b->prev) |
c917d901 | 8198 | { |
393b349a | 8199 | parm = b->decl; |
8200 | if (TREE_CODE (parm) != PARM_DECL) | |
8201 | continue; | |
8202 | ||
69c2525c | 8203 | if (TREE_TYPE (parm) != error_mark_node |
8204 | && !COMPLETE_TYPE_P (TREE_TYPE (parm))) | |
51ef3909 | 8205 | { |
e60a6f7b | 8206 | error_at (DECL_SOURCE_LOCATION (parm), |
8207 | "parameter %qD has incomplete type", parm); | |
c917d901 | 8208 | TREE_TYPE (parm) = error_mark_node; |
8209 | } | |
51ef3909 | 8210 | |
5ded8c6f | 8211 | if (!pointer_set_contains (seen_args, parm)) |
c917d901 | 8212 | { |
e60a6f7b | 8213 | error_at (DECL_SOURCE_LOCATION (parm), |
8214 | "declaration for parameter %qD but no such parameter", | |
8215 | parm); | |
51ef3909 | 8216 | |
c917d901 | 8217 | /* Pretend the parameter was not missing. |
8218 | This gets us to a standard state and minimizes | |
8219 | further error messages. */ | |
8220 | parmids = chainon (parmids, tree_cons (parm, 0, 0)); | |
51ef3909 | 8221 | } |
c917d901 | 8222 | } |
51ef3909 | 8223 | |
c917d901 | 8224 | /* Chain the declarations together in the order of the list of |
8225 | names. Store that chain in the function decl, replacing the | |
f74be9a1 | 8226 | list of names. Update the current scope to match. */ |
c917d901 | 8227 | DECL_ARGUMENTS (fndecl) = 0; |
c917d901 | 8228 | |
f74be9a1 | 8229 | for (parm = parmids; parm; parm = TREE_CHAIN (parm)) |
8230 | if (TREE_PURPOSE (parm)) | |
8231 | break; | |
8232 | if (parm && TREE_PURPOSE (parm)) | |
8233 | { | |
8234 | last = TREE_PURPOSE (parm); | |
8235 | DECL_ARGUMENTS (fndecl) = last; | |
f74be9a1 | 8236 | |
8237 | for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm)) | |
8238 | if (TREE_PURPOSE (parm)) | |
8239 | { | |
1767a056 | 8240 | DECL_CHAIN (last) = TREE_PURPOSE (parm); |
f74be9a1 | 8241 | last = TREE_PURPOSE (parm); |
f74be9a1 | 8242 | } |
1767a056 | 8243 | DECL_CHAIN (last) = 0; |
f74be9a1 | 8244 | } |
51ef3909 | 8245 | |
5ded8c6f | 8246 | pointer_set_destroy (seen_args); |
8247 | ||
c917d901 | 8248 | /* If there was a previous prototype, |
8249 | set the DECL_ARG_TYPE of each argument according to | |
8250 | the type previously specified, and report any mismatches. */ | |
51ef3909 | 8251 | |
3eafcdb5 | 8252 | if (current_function_prototype_arg_types) |
c917d901 | 8253 | { |
8254 | tree type; | |
8255 | for (parm = DECL_ARGUMENTS (fndecl), | |
3eafcdb5 | 8256 | type = current_function_prototype_arg_types; |
9db402ec | 8257 | parm || (type && TREE_VALUE (type) != error_mark_node |
8258 | && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node)); | |
1767a056 | 8259 | parm = DECL_CHAIN (parm), type = TREE_CHAIN (type)) |
51ef3909 | 8260 | { |
c917d901 | 8261 | if (parm == 0 || type == 0 |
8262 | || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node) | |
51ef3909 | 8263 | { |
3eafcdb5 | 8264 | if (current_function_prototype_built_in) |
e60a6f7b | 8265 | warning_at (DECL_SOURCE_LOCATION (fndecl), |
8266 | 0, "number of arguments doesn%'t match " | |
8267 | "built-in prototype"); | |
3eafcdb5 | 8268 | else |
8269 | { | |
e60a6f7b | 8270 | /* FIXME diagnostics: This should be the location of |
8271 | FNDECL, but there is bug when a prototype is | |
8272 | declared inside function context, but defined | |
8273 | outside of it (e.g., gcc.dg/pr15698-2.c). In | |
8274 | which case FNDECL gets the location of the | |
8275 | prototype, not the definition. */ | |
8276 | error_at (input_location, | |
8277 | "number of arguments doesn%'t match prototype"); | |
8278 | ||
8279 | error_at (current_function_prototype_locus, | |
8280 | "prototype declaration"); | |
3eafcdb5 | 8281 | } |
c917d901 | 8282 | break; |
8283 | } | |
8284 | /* Type for passing arg must be consistent with that | |
8285 | declared for the arg. ISO C says we take the unqualified | |
8286 | type for parameters declared with qualified type. */ | |
e911c0fe | 8287 | if (TREE_TYPE (parm) != error_mark_node |
8288 | && TREE_TYPE (type) != error_mark_node | |
b560fabd | 8289 | && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm)) |
8290 | != TYPE_ATOMIC (TREE_VALUE (type))) | |
8291 | || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)), | |
8292 | TYPE_MAIN_VARIANT (TREE_VALUE (type))))) | |
c917d901 | 8293 | { |
b560fabd | 8294 | if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm)) |
8295 | == TYPE_ATOMIC (TREE_VALUE (type))) | |
8296 | && (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) | |
8297 | == TYPE_MAIN_VARIANT (TREE_VALUE (type)))) | |
51ef3909 | 8298 | { |
c917d901 | 8299 | /* Adjust argument to match prototype. E.g. a previous |
8300 | `int foo(float);' prototype causes | |
8301 | `int foo(x) float x; {...}' to be treated like | |
8302 | `int foo(float x) {...}'. This is particularly | |
8303 | useful for argument types like uid_t. */ | |
8304 | DECL_ARG_TYPE (parm) = TREE_TYPE (parm); | |
8305 | ||
45550790 | 8306 | if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl)) |
c917d901 | 8307 | && INTEGRAL_TYPE_P (TREE_TYPE (parm)) |
8308 | && TYPE_PRECISION (TREE_TYPE (parm)) | |
8309 | < TYPE_PRECISION (integer_type_node)) | |
b560fabd | 8310 | DECL_ARG_TYPE (parm) |
8311 | = c_type_promotes_to (TREE_TYPE (parm)); | |
c917d901 | 8312 | |
8864917d | 8313 | /* ??? Is it possible to get here with a |
8314 | built-in prototype or will it always have | |
8315 | been diagnosed as conflicting with an | |
8316 | old-style definition and discarded? */ | |
8317 | if (current_function_prototype_built_in) | |
e60a6f7b | 8318 | warning_at (DECL_SOURCE_LOCATION (parm), |
29438999 | 8319 | OPT_Wpedantic, "promoted argument %qD " |
e60a6f7b | 8320 | "doesn%'t match built-in prototype", parm); |
8864917d | 8321 | else |
06460bd1 | 8322 | { |
e60a6f7b | 8323 | pedwarn (DECL_SOURCE_LOCATION (parm), |
29438999 | 8324 | OPT_Wpedantic, "promoted argument %qD " |
8864917d | 8325 | "doesn%'t match prototype", parm); |
29438999 | 8326 | pedwarn (current_function_prototype_locus, OPT_Wpedantic, |
21ca8540 | 8327 | "prototype declaration"); |
06460bd1 | 8328 | } |
51ef3909 | 8329 | } |
c917d901 | 8330 | else |
8331 | { | |
3eafcdb5 | 8332 | if (current_function_prototype_built_in) |
e60a6f7b | 8333 | warning_at (DECL_SOURCE_LOCATION (parm), |
8334 | 0, "argument %qD doesn%'t match " | |
8335 | "built-in prototype", parm); | |
3eafcdb5 | 8336 | else |
8337 | { | |
e60a6f7b | 8338 | error_at (DECL_SOURCE_LOCATION (parm), |
8339 | "argument %qD doesn%'t match prototype", parm); | |
8340 | error_at (current_function_prototype_locus, | |
8341 | "prototype declaration"); | |
3eafcdb5 | 8342 | } |
c917d901 | 8343 | } |
51ef3909 | 8344 | } |
51ef3909 | 8345 | } |
c917d901 | 8346 | TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0; |
8347 | } | |
51ef3909 | 8348 | |
c917d901 | 8349 | /* Otherwise, create a prototype that would match. */ |
51ef3909 | 8350 | |
c917d901 | 8351 | else |
8352 | { | |
8353 | tree actual = 0, last = 0, type; | |
51ef3909 | 8354 | |
1767a056 | 8355 | for (parm = DECL_ARGUMENTS (fndecl); parm; parm = DECL_CHAIN (parm)) |
c917d901 | 8356 | { |
8357 | type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE); | |
51ef3909 | 8358 | if (last) |
8359 | TREE_CHAIN (last) = type; | |
8360 | else | |
8361 | actual = type; | |
c917d901 | 8362 | last = type; |
8363 | } | |
8364 | type = tree_cons (NULL_TREE, void_type_node, NULL_TREE); | |
8365 | if (last) | |
8366 | TREE_CHAIN (last) = type; | |
8367 | else | |
8368 | actual = type; | |
51ef3909 | 8369 | |
c917d901 | 8370 | /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES |
8371 | of the type of this function, but we need to avoid having this | |
8372 | affect the types of other similarly-typed functions, so we must | |
8373 | first force the generation of an identical (but separate) type | |
8374 | node for the relevant function type. The new node we create | |
8375 | will be a variant of the main variant of the original function | |
8376 | type. */ | |
c275c235 | 8377 | |
e086912e | 8378 | TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl)); |
c275c235 | 8379 | |
c917d901 | 8380 | TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual; |
8381 | } | |
c917d901 | 8382 | } |
8383 | ||
38401f3c | 8384 | /* Store parameter declarations passed in ARG_INFO into the current |
8385 | function declaration. */ | |
8386 | ||
8387 | void | |
ac206aff | 8388 | store_parm_decls_from (struct c_arg_info *arg_info) |
38401f3c | 8389 | { |
8390 | current_function_arg_info = arg_info; | |
8391 | store_parm_decls (); | |
8392 | } | |
8393 | ||
c917d901 | 8394 | /* Store the parameter declarations into the current function declaration. |
8395 | This is called after parsing the parameter declarations, before | |
8396 | digesting the body of the function. | |
8397 | ||
8398 | For an old-style definition, construct a prototype out of the old-style | |
8399 | parameter declarations and inject it into the function's type. */ | |
8400 | ||
8401 | void | |
8402 | store_parm_decls (void) | |
8403 | { | |
8404 | tree fndecl = current_function_decl; | |
731e6cbf | 8405 | bool proto; |
c917d901 | 8406 | |
a89ce285 | 8407 | /* The argument information block for FNDECL. */ |
ac206aff | 8408 | struct c_arg_info *arg_info = current_function_arg_info; |
731e6cbf | 8409 | current_function_arg_info = 0; |
a89ce285 | 8410 | |
393b349a | 8411 | /* True if this definition is written with a prototype. Note: |
8412 | despite C99 6.7.5.3p14, we can *not* treat an empty argument | |
8413 | list in a function definition as equivalent to (void) -- an | |
8414 | empty argument list specifies the function has no parameters, | |
8415 | but only (void) sets up a prototype for future calls. */ | |
ac206aff | 8416 | proto = arg_info->types != 0; |
c917d901 | 8417 | |
393b349a | 8418 | if (proto) |
a89ce285 | 8419 | store_parm_decls_newstyle (fndecl, arg_info); |
c917d901 | 8420 | else |
a89ce285 | 8421 | store_parm_decls_oldstyle (fndecl, arg_info); |
51ef3909 | 8422 | |
393b349a | 8423 | /* The next call to push_scope will be a function body. */ |
51ef3909 | 8424 | |
e69f6ec7 | 8425 | next_is_function_body = true; |
51ef3909 | 8426 | |
51ef3909 | 8427 | /* Write a record describing this function definition to the prototypes |
8428 | file (if requested). */ | |
8429 | ||
393b349a | 8430 | gen_aux_info_record (fndecl, 1, 0, proto); |
51ef3909 | 8431 | |
8432 | /* Initialize the RTL code for the function. */ | |
80f2ef47 | 8433 | allocate_struct_function (fndecl, false); |
51ef3909 | 8434 | |
a4e3ffad | 8435 | if (warn_unused_local_typedefs) |
8436 | cfun->language = ggc_alloc_cleared_language_function (); | |
8437 | ||
e41f0d80 | 8438 | /* Begin the statement tree for this function. */ |
2363ef00 | 8439 | DECL_SAVED_TREE (fndecl) = push_stmt_list (); |
51ef3909 | 8440 | |
67c155cb | 8441 | /* ??? Insert the contents of the pending sizes list into the function |
6b275368 | 8442 | to be evaluated. The only reason left to have this is |
8443 | void foo(int n, int array[n++]) | |
8444 | because we throw away the array type in favor of a pointer type, and | |
8445 | thus won't naturally see the SAVE_EXPR containing the increment. All | |
8446 | other pending sizes would be handled by gimplify_parameters. */ | |
4232a958 | 8447 | if (arg_info->pending_sizes) |
8448 | add_stmt (arg_info->pending_sizes); | |
51ef3909 | 8449 | } |
bc7bff74 | 8450 | |
8451 | /* Store PARM_DECLs in PARMS into scope temporarily. Used for | |
8452 | c_finish_omp_declare_simd for function prototypes. No diagnostics | |
8453 | should be done. */ | |
8454 | ||
8455 | void | |
8456 | temp_store_parm_decls (tree fndecl, tree parms) | |
8457 | { | |
8458 | push_scope (); | |
8459 | for (tree p = parms; p; p = DECL_CHAIN (p)) | |
8460 | { | |
8461 | DECL_CONTEXT (p) = fndecl; | |
8462 | if (DECL_NAME (p)) | |
8463 | bind (DECL_NAME (p), p, current_scope, | |
8464 | /*invisible=*/false, /*nested=*/false, | |
8465 | UNKNOWN_LOCATION); | |
8466 | } | |
8467 | } | |
8468 | ||
8469 | /* Undo what temp_store_parm_decls did. */ | |
8470 | ||
8471 | void | |
8472 | temp_pop_parm_decls (void) | |
8473 | { | |
8474 | /* Clear all bindings in this temporary scope, so that | |
8475 | pop_scope doesn't create a BLOCK. */ | |
8476 | struct c_binding *b = current_scope->bindings; | |
8477 | current_scope->bindings = NULL; | |
8478 | for (; b; b = free_binding_and_advance (b)) | |
8479 | { | |
8480 | gcc_assert (TREE_CODE (b->decl) == PARM_DECL); | |
8481 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); | |
8482 | I_SYMBOL_BINDING (b->id) = b->shadowed; | |
8483 | if (b->shadowed && b->shadowed->u.type) | |
8484 | TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type; | |
8485 | } | |
8486 | pop_scope (); | |
8487 | } | |
51ef3909 | 8488 | \f |
4ee9c684 | 8489 | |
51ef3909 | 8490 | /* Finish up a function declaration and compile that function |
dcf94f3a | 8491 | all the way to assembler language output. Then free the storage |
51ef3909 | 8492 | for the function definition. |
8493 | ||
2ff66ee0 | 8494 | This is called after parsing the body of the function definition. */ |
51ef3909 | 8495 | |
8496 | void | |
eb32e911 | 8497 | finish_function (void) |
51ef3909 | 8498 | { |
19cb6b50 | 8499 | tree fndecl = current_function_decl; |
d7489d8d | 8500 | |
8501 | if (c_dialect_objc ()) | |
8502 | objc_finish_function (); | |
51ef3909 | 8503 | |
45550790 | 8504 | if (TREE_CODE (fndecl) == FUNCTION_DECL |
8505 | && targetm.calls.promote_prototypes (TREE_TYPE (fndecl))) | |
8506 | { | |
8507 | tree args = DECL_ARGUMENTS (fndecl); | |
1767a056 | 8508 | for (; args; args = DECL_CHAIN (args)) |
a0c938f0 | 8509 | { |
8510 | tree type = TREE_TYPE (args); | |
8511 | if (INTEGRAL_TYPE_P (type) | |
8512 | && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) | |
b560fabd | 8513 | DECL_ARG_TYPE (args) = c_type_promotes_to (type); |
a0c938f0 | 8514 | } |
45550790 | 8515 | } |
8516 | ||
35aab7c4 | 8517 | if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node) |
fcbb2ca1 | 8518 | BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl; |
51ef3909 | 8519 | |
8520 | /* Must mark the RESULT_DECL as being in this function. */ | |
8521 | ||
35aab7c4 | 8522 | if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node) |
fcbb2ca1 | 8523 | DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl; |
51ef3909 | 8524 | |
23efcc02 | 8525 | if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted |
8526 | && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) | |
8527 | == integer_type_node && flag_isoc99) | |
8528 | { | |
23efcc02 | 8529 | /* Hack. We don't want the middle-end to warn that this return |
8530 | is unreachable, so we mark its location as special. Using | |
8531 | UNKNOWN_LOCATION has the problem that it gets clobbered in | |
8532 | annotate_one_with_locus. A cleaner solution might be to | |
8533 | ensure ! should_carry_locus_p (stmt), but that needs a flag. | |
8534 | */ | |
e60a6f7b | 8535 | c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE); |
51ef3909 | 8536 | } |
1cae46be | 8537 | |
e41f0d80 | 8538 | /* Tie off the statement tree for this function. */ |
2363ef00 | 8539 | DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl)); |
8540 | ||
d037099f | 8541 | /* If the function has _Cilk_spawn in front of a function call inside it |
8542 | i.e. it is a spawning function, then add the appropriate Cilk plus | |
8543 | functions inside. */ | |
8544 | if (fn_contains_cilk_spawn_p (cfun)) | |
8545 | cfun->cilk_frame_decl = insert_cilk_frame (fndecl); | |
8546 | ||
2363ef00 | 8547 | finish_fname_decls (); |
af857942 | 8548 | |
8549 | /* Complain if there's just no return statement. */ | |
4edb3605 | 8550 | if (warn_return_type |
8551 | && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE | |
af857942 | 8552 | && !current_function_returns_value && !current_function_returns_null |
a53ff4c1 | 8553 | /* Don't complain if we are no-return. */ |
af857942 | 8554 | && !current_function_returns_abnormally |
578d2695 | 8555 | /* Don't complain if we are declared noreturn. */ |
8556 | && !TREE_THIS_VOLATILE (fndecl) | |
af857942 | 8557 | /* Don't warn for main(). */ |
8558 | && !MAIN_NAME_P (DECL_NAME (fndecl)) | |
8559 | /* Or if they didn't actually specify a return type. */ | |
8560 | && !C_FUNCTION_IMPLICIT_INT (fndecl) | |
6329636b | 8561 | /* Normally, with -Wreturn-type, flow will complain, but we might |
8562 | optimize out static functions. */ | |
8563 | && !TREE_PUBLIC (fndecl)) | |
6a13f013 | 8564 | { |
6bf97f82 | 8565 | warning (OPT_Wreturn_type, |
8566 | "no return statement in function returning non-void"); | |
6a13f013 | 8567 | TREE_NO_WARNING (fndecl) = 1; |
8568 | } | |
af857942 | 8569 | |
abc6c64f | 8570 | /* Complain about parameters that are only set, but never otherwise used. */ |
8571 | if (warn_unused_but_set_parameter) | |
8572 | { | |
8573 | tree decl; | |
8574 | ||
8575 | for (decl = DECL_ARGUMENTS (fndecl); | |
8576 | decl; | |
1767a056 | 8577 | decl = DECL_CHAIN (decl)) |
abc6c64f | 8578 | if (TREE_USED (decl) |
8579 | && TREE_CODE (decl) == PARM_DECL | |
8580 | && !DECL_READ_P (decl) | |
8581 | && DECL_NAME (decl) | |
8582 | && !DECL_ARTIFICIAL (decl) | |
8583 | && !TREE_NO_WARNING (decl)) | |
8584 | warning_at (DECL_SOURCE_LOCATION (decl), | |
8585 | OPT_Wunused_but_set_parameter, | |
8586 | "parameter %qD set but not used", decl); | |
8587 | } | |
8588 | ||
a4e3ffad | 8589 | /* Complain about locally defined typedefs that are not used in this |
8590 | function. */ | |
8591 | maybe_warn_unused_local_typedefs (); | |
8592 | ||
4ee9c684 | 8593 | /* Store the end of the function, so that we get good line number |
8594 | info for the epilogue. */ | |
8595 | cfun->function_end_locus = input_location; | |
8596 | ||
3aa0c315 | 8597 | /* Finalize the ELF visibility for the function. */ |
8598 | c_determine_visibility (fndecl); | |
8599 | ||
ebb7d626 | 8600 | /* For GNU C extern inline functions disregard inline limits. */ |
48e1416a | 8601 | if (DECL_EXTERNAL (fndecl) |
ebb7d626 | 8602 | && DECL_DECLARED_INLINE_P (fndecl)) |
8603 | DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1; | |
8604 | ||
4ee9c684 | 8605 | /* Genericize before inlining. Delay genericizing nested functions |
8606 | until their parent function is genericized. Since finalizing | |
8607 | requires GENERIC, delay that as well. */ | |
14338e9a | 8608 | |
8a1f0315 | 8609 | if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node |
8610 | && !undef_nested_function) | |
4ee9c684 | 8611 | { |
8612 | if (!decl_function_context (fndecl)) | |
a0c938f0 | 8613 | { |
0bac94cb | 8614 | invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl); |
a0c938f0 | 8615 | c_genericize (fndecl); |
7a2371fd | 8616 | |
8617 | /* ??? Objc emits functions after finalizing the compilation unit. | |
8618 | This should be cleaned up later and this conditional removed. */ | |
8619 | if (cgraph_global_info_ready) | |
8620 | { | |
84e10000 | 8621 | cgraph_add_new_function (fndecl, false); |
7a2371fd | 8622 | return; |
8623 | } | |
7a2371fd | 8624 | cgraph_finalize_function (fndecl, false); |
a0c938f0 | 8625 | } |
4ee9c684 | 8626 | else |
a0c938f0 | 8627 | { |
8628 | /* Register this function with cgraph just far enough to get it | |
8629 | added to our parent's nested function list. Handy, since the | |
8630 | C front end doesn't have such a list. */ | |
5a90471f | 8631 | (void) cgraph_get_create_node (fndecl); |
a0c938f0 | 8632 | } |
4ee9c684 | 8633 | } |
8634 | ||
8a1f0315 | 8635 | if (!decl_function_context (fndecl)) |
8636 | undef_nested_function = false; | |
8637 | ||
a4e3ffad | 8638 | if (cfun->language != NULL) |
8639 | { | |
8640 | ggc_free (cfun->language); | |
8641 | cfun->language = NULL; | |
8642 | } | |
8643 | ||
cbc44df5 | 8644 | /* We're leaving the context of this function, so zap cfun. |
4ee9c684 | 8645 | It's still in DECL_STRUCT_FUNCTION, and we'll restore it in |
cbc44df5 | 8646 | tree_rest_of_compilation. */ |
87d4aa85 | 8647 | set_cfun (NULL); |
2ff66ee0 | 8648 | current_function_decl = NULL; |
e41f0d80 | 8649 | } |
51ef3909 | 8650 | \f |
5e4f9988 | 8651 | /* Check the declarations given in a for-loop for satisfying the C99 |
e60a6f7b | 8652 | constraints. If exactly one such decl is found, return it. LOC is |
0a65c3bb | 8653 | the location of the opening parenthesis of the for loop. The last |
8654 | parameter allows you to control the "for loop initial declarations | |
8655 | are only allowed in C99 mode". Normally, you should pass | |
8656 | flag_isoc99 as that parameter. But in some cases (Objective-C | |
8657 | foreach loop, for example) we want to run the checks in this | |
8658 | function even if not in C99 mode, so we allow the caller to turn | |
8659 | off the error about not being in C99 mode. | |
8660 | */ | |
1e8e9920 | 8661 | |
8662 | tree | |
0a65c3bb | 8663 | check_for_loop_decls (location_t loc, bool turn_off_iso_c99_error) |
5e4f9988 | 8664 | { |
393b349a | 8665 | struct c_binding *b; |
1e8e9920 | 8666 | tree one_decl = NULL_TREE; |
8667 | int n_decls = 0; | |
8668 | ||
0a65c3bb | 8669 | if (!turn_off_iso_c99_error) |
5e4f9988 | 8670 | { |
2292dd7a | 8671 | static bool hint = true; |
5e4f9988 | 8672 | /* If we get here, declarations have been used in a for loop without |
8673 | the C99 for loop scope. This doesn't make much sense, so don't | |
8674 | allow it. */ | |
e60a6f7b | 8675 | error_at (loc, "%<for%> loop initial declarations " |
01e6cdb4 | 8676 | "are only allowed in C99 or C11 mode"); |
2292dd7a | 8677 | if (hint) |
8678 | { | |
e60a6f7b | 8679 | inform (loc, |
01e6cdb4 | 8680 | "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 " |
8681 | "to compile your code"); | |
2292dd7a | 8682 | hint = false; |
8683 | } | |
1e8e9920 | 8684 | return NULL_TREE; |
5e4f9988 | 8685 | } |
8686 | /* C99 subclause 6.8.5 paragraph 3: | |
8687 | ||
8688 | [#3] The declaration part of a for statement shall only | |
8689 | declare identifiers for objects having storage class auto or | |
8690 | register. | |
8691 | ||
8692 | It isn't clear whether, in this sentence, "identifiers" binds to | |
8693 | "shall only declare" or to "objects" - that is, whether all identifiers | |
8694 | declared must be identifiers for objects, or whether the restriction | |
8695 | only applies to those that are. (A question on this in comp.std.c | |
8696 | in November 2000 received no answer.) We implement the strictest | |
8697 | interpretation, to avoid creating an extension which later causes | |
8698 | problems. */ | |
8699 | ||
393b349a | 8700 | for (b = current_scope->bindings; b; b = b->prev) |
5e4f9988 | 8701 | { |
393b349a | 8702 | tree id = b->id; |
8703 | tree decl = b->decl; | |
1a5a5cd8 | 8704 | |
393b349a | 8705 | if (!id) |
8706 | continue; | |
8707 | ||
8708 | switch (TREE_CODE (decl)) | |
8709 | { | |
8710 | case VAR_DECL: | |
e60a6f7b | 8711 | { |
8712 | location_t decl_loc = DECL_SOURCE_LOCATION (decl); | |
8713 | if (TREE_STATIC (decl)) | |
8714 | error_at (decl_loc, | |
8715 | "declaration of static variable %qD in %<for%> loop " | |
8716 | "initial declaration", decl); | |
8717 | else if (DECL_EXTERNAL (decl)) | |
8718 | error_at (decl_loc, | |
8719 | "declaration of %<extern%> variable %qD in %<for%> loop " | |
8720 | "initial declaration", decl); | |
8721 | } | |
393b349a | 8722 | break; |
8723 | ||
8724 | case RECORD_TYPE: | |
e60a6f7b | 8725 | error_at (loc, |
8726 | "%<struct %E%> declared in %<for%> loop initial " | |
8727 | "declaration", id); | |
393b349a | 8728 | break; |
8729 | case UNION_TYPE: | |
e60a6f7b | 8730 | error_at (loc, |
8731 | "%<union %E%> declared in %<for%> loop initial declaration", | |
8732 | id); | |
393b349a | 8733 | break; |
8734 | case ENUMERAL_TYPE: | |
e60a6f7b | 8735 | error_at (loc, "%<enum %E%> declared in %<for%> loop " |
8736 | "initial declaration", id); | |
393b349a | 8737 | break; |
8738 | default: | |
e60a6f7b | 8739 | error_at (loc, "declaration of non-variable " |
8740 | "%qD in %<for%> loop initial declaration", decl); | |
393b349a | 8741 | } |
1e8e9920 | 8742 | |
8743 | n_decls++; | |
8744 | one_decl = decl; | |
5e4f9988 | 8745 | } |
1e8e9920 | 8746 | |
8747 | return n_decls == 1 ? one_decl : NULL_TREE; | |
5e4f9988 | 8748 | } |
8749 | \f | |
51ef3909 | 8750 | /* Save and reinitialize the variables |
8751 | used during compilation of a C function. */ | |
8752 | ||
8753 | void | |
d2764e2d | 8754 | c_push_function_context (void) |
51ef3909 | 8755 | { |
fd9cb2ca | 8756 | struct language_function *p = cfun->language; |
8757 | /* cfun->language might have been already allocated by the use of | |
8758 | -Wunused-local-typedefs. In that case, just re-use it. */ | |
8759 | if (p == NULL) | |
8760 | cfun->language = p = ggc_alloc_cleared_language_function (); | |
51ef3909 | 8761 | |
e41f0d80 | 8762 | p->base.x_stmt_tree = c_stmt_tree; |
f1f41a6c | 8763 | c_stmt_tree.x_cur_stmt_list = vec_safe_copy (c_stmt_tree.x_cur_stmt_list); |
0375a275 | 8764 | p->x_break_label = c_break_label; |
8765 | p->x_cont_label = c_cont_label; | |
8766 | p->x_switch_stack = c_switch_stack; | |
731e6cbf | 8767 | p->arg_info = current_function_arg_info; |
51ef3909 | 8768 | p->returns_value = current_function_returns_value; |
8769 | p->returns_null = current_function_returns_null; | |
af857942 | 8770 | p->returns_abnormally = current_function_returns_abnormally; |
51ef3909 | 8771 | p->warn_about_return_type = warn_about_return_type; |
d2764e2d | 8772 | |
8773 | push_function_context (); | |
51ef3909 | 8774 | } |
8775 | ||
8776 | /* Restore the variables used during compilation of a C function. */ | |
8777 | ||
8778 | void | |
d2764e2d | 8779 | c_pop_function_context (void) |
51ef3909 | 8780 | { |
d2764e2d | 8781 | struct language_function *p; |
8782 | ||
8783 | pop_function_context (); | |
8784 | p = cfun->language; | |
fd9cb2ca | 8785 | |
8786 | /* When -Wunused-local-typedefs is in effect, cfun->languages is | |
8787 | used to store data throughout the life time of the current cfun, | |
8788 | So don't deallocate it. */ | |
8789 | if (!warn_unused_local_typedefs) | |
8790 | cfun->language = NULL; | |
51ef3909 | 8791 | |
cbc44df5 | 8792 | if (DECL_STRUCT_FUNCTION (current_function_decl) == 0 |
e41f0d80 | 8793 | && DECL_SAVED_TREE (current_function_decl) == NULL_TREE) |
51ef3909 | 8794 | { |
8795 | /* Stop pointing to the local nodes about to be freed. */ | |
8796 | /* But DECL_INITIAL must remain nonzero so we know this | |
8797 | was an actual function definition. */ | |
8798 | DECL_INITIAL (current_function_decl) = error_mark_node; | |
8799 | DECL_ARGUMENTS (current_function_decl) = 0; | |
8800 | } | |
8801 | ||
e41f0d80 | 8802 | c_stmt_tree = p->base.x_stmt_tree; |
fd9cb2ca | 8803 | p->base.x_stmt_tree.x_cur_stmt_list = NULL; |
0375a275 | 8804 | c_break_label = p->x_break_label; |
8805 | c_cont_label = p->x_cont_label; | |
8806 | c_switch_stack = p->x_switch_stack; | |
731e6cbf | 8807 | current_function_arg_info = p->arg_info; |
51ef3909 | 8808 | current_function_returns_value = p->returns_value; |
8809 | current_function_returns_null = p->returns_null; | |
af857942 | 8810 | current_function_returns_abnormally = p->returns_abnormally; |
51ef3909 | 8811 | warn_about_return_type = p->warn_about_return_type; |
dc12af01 | 8812 | } |
8813 | ||
5c3247a9 | 8814 | /* The functions below are required for functionality of doing |
8815 | function at once processing in the C front end. Currently these | |
8816 | functions are not called from anywhere in the C front end, but as | |
4214af46 | 8817 | these changes continue, that will change. */ |
5c3247a9 | 8818 | |
a08e60ae | 8819 | /* Returns the stmt_tree (if any) to which statements are currently |
8820 | being added. If there is no active statement-tree, NULL is | |
8821 | returned. */ | |
8822 | ||
8823 | stmt_tree | |
1cae46be | 8824 | current_stmt_tree (void) |
a08e60ae | 8825 | { |
e41f0d80 | 8826 | return &c_stmt_tree; |
8827 | } | |
8828 | ||
31ddae9f | 8829 | /* Return the global value of T as a symbol. */ |
6bf5ed8d | 8830 | |
8831 | tree | |
1cae46be | 8832 | identifier_global_value (tree t) |
6bf5ed8d | 8833 | { |
393b349a | 8834 | struct c_binding *b; |
31ddae9f | 8835 | |
393b349a | 8836 | for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed) |
4194491a | 8837 | if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b)) |
393b349a | 8838 | return b->decl; |
31ddae9f | 8839 | |
31ddae9f | 8840 | return 0; |
6bf5ed8d | 8841 | } |
174fcc61 | 8842 | |
27282252 | 8843 | /* In C, the only C-linkage public declaration is at file scope. */ |
8844 | ||
8845 | tree | |
8846 | c_linkage_bindings (tree name) | |
8847 | { | |
8848 | return identifier_global_value (name); | |
8849 | } | |
8850 | ||
174fcc61 | 8851 | /* Record a builtin type for C. If NAME is non-NULL, it is the name used; |
8852 | otherwise the name is found in ridpointers from RID_INDEX. */ | |
8853 | ||
8854 | void | |
1cae46be | 8855 | record_builtin_type (enum rid rid_index, const char *name, tree type) |
174fcc61 | 8856 | { |
f62468fc | 8857 | tree id, decl; |
174fcc61 | 8858 | if (name == 0) |
8859 | id = ridpointers[(int) rid_index]; | |
8860 | else | |
8861 | id = get_identifier (name); | |
e60a6f7b | 8862 | decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type); |
f62468fc | 8863 | pushdecl (decl); |
8864 | if (debug_hooks->type_decl) | |
8865 | debug_hooks->type_decl (decl, false); | |
174fcc61 | 8866 | } |
8867 | ||
8868 | /* Build the void_list_node (void_type_node having been created). */ | |
8869 | tree | |
1cae46be | 8870 | build_void_list_node (void) |
174fcc61 | 8871 | { |
8872 | tree t = build_tree_list (NULL_TREE, void_type_node); | |
8873 | return t; | |
8874 | } | |
90cc7820 | 8875 | |
ac206aff | 8876 | /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */ |
0a423af5 | 8877 | |
ac206aff | 8878 | struct c_parm * |
9553111d | 8879 | build_c_parm (struct c_declspecs *specs, tree attrs, |
8880 | struct c_declarator *declarator) | |
0a423af5 | 8881 | { |
ac206aff | 8882 | struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm); |
8883 | ret->specs = specs; | |
8884 | ret->attrs = attrs; | |
8885 | ret->declarator = declarator; | |
8886 | return ret; | |
0a423af5 | 8887 | } |
8888 | ||
8889 | /* Return a declarator with nested attributes. TARGET is the inner | |
8890 | declarator to which these attributes apply. ATTRS are the | |
8891 | attributes. */ | |
8892 | ||
ac206aff | 8893 | struct c_declarator * |
8894 | build_attrs_declarator (tree attrs, struct c_declarator *target) | |
0a423af5 | 8895 | { |
ac206aff | 8896 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); |
8897 | ret->kind = cdk_attrs; | |
8898 | ret->declarator = target; | |
8899 | ret->u.attrs = attrs; | |
8900 | return ret; | |
0a423af5 | 8901 | } |
8902 | ||
8903 | /* Return a declarator for a function with arguments specified by ARGS | |
8904 | and return type specified by TARGET. */ | |
8905 | ||
ac206aff | 8906 | struct c_declarator * |
8907 | build_function_declarator (struct c_arg_info *args, | |
8908 | struct c_declarator *target) | |
0a423af5 | 8909 | { |
ac206aff | 8910 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); |
8911 | ret->kind = cdk_function; | |
8912 | ret->declarator = target; | |
8913 | ret->u.arg_info = args; | |
8914 | return ret; | |
8915 | } | |
8916 | ||
8917 | /* Return a declarator for the identifier IDENT (which may be | |
8918 | NULL_TREE for an abstract declarator). */ | |
8919 | ||
8920 | struct c_declarator * | |
8921 | build_id_declarator (tree ident) | |
8922 | { | |
8923 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); | |
8924 | ret->kind = cdk_id; | |
8925 | ret->declarator = 0; | |
8926 | ret->u.id = ident; | |
6342afac | 8927 | /* Default value - may get reset to a more precise location. */ |
8928 | ret->id_loc = input_location; | |
ac206aff | 8929 | return ret; |
0a423af5 | 8930 | } |
8931 | ||
90cc7820 | 8932 | /* Return something to represent absolute declarators containing a *. |
8933 | TARGET is the absolute declarator that the * contains. | |
9553111d | 8934 | TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes |
8935 | to apply to the pointer type. */ | |
90cc7820 | 8936 | |
ac206aff | 8937 | struct c_declarator * |
9553111d | 8938 | make_pointer_declarator (struct c_declspecs *type_quals_attrs, |
8939 | struct c_declarator *target) | |
90cc7820 | 8940 | { |
9553111d | 8941 | tree attrs; |
bb476216 | 8942 | int quals = 0; |
ac206aff | 8943 | struct c_declarator *itarget = target; |
8944 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); | |
9553111d | 8945 | if (type_quals_attrs) |
8946 | { | |
8947 | attrs = type_quals_attrs->attrs; | |
bb476216 | 8948 | quals = quals_from_declspecs (type_quals_attrs); |
9553111d | 8949 | if (attrs != NULL_TREE) |
8950 | itarget = build_attrs_declarator (attrs, target); | |
8951 | } | |
ac206aff | 8952 | ret->kind = cdk_pointer; |
8953 | ret->declarator = itarget; | |
bb476216 | 8954 | ret->u.pointer_quals = quals; |
9553111d | 8955 | return ret; |
8956 | } | |
8957 | ||
8958 | /* Return a pointer to a structure for an empty list of declaration | |
8959 | specifiers. */ | |
8960 | ||
8961 | struct c_declspecs * | |
8962 | build_null_declspecs (void) | |
8963 | { | |
8964 | struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs); | |
a60f3e81 | 8965 | memset (&ret->locations, 0, cdw_number_of_elements); |
9553111d | 8966 | ret->type = 0; |
a75b1c71 | 8967 | ret->expr = 0; |
9553111d | 8968 | ret->decl_attr = 0; |
8969 | ret->attrs = 0; | |
83e25171 | 8970 | ret->align_log = -1; |
70dd11f7 | 8971 | ret->typespec_word = cts_none; |
feb04535 | 8972 | ret->storage_class = csc_none; |
a75b1c71 | 8973 | ret->expr_const_operands = true; |
1576dec7 | 8974 | ret->declspecs_seen_p = false; |
ae5ead32 | 8975 | ret->typespec_kind = ctsk_none; |
9553111d | 8976 | ret->non_sc_seen_p = false; |
490eec42 | 8977 | ret->typedef_p = false; |
70dd11f7 | 8978 | ret->explicit_signed_p = false; |
9553111d | 8979 | ret->deprecated_p = false; |
70dd11f7 | 8980 | ret->default_int_p = false; |
8981 | ret->long_p = false; | |
9553111d | 8982 | ret->long_long_p = false; |
70dd11f7 | 8983 | ret->short_p = false; |
8984 | ret->signed_p = false; | |
8985 | ret->unsigned_p = false; | |
8986 | ret->complex_p = false; | |
feb04535 | 8987 | ret->inline_p = false; |
985c6e3a | 8988 | ret->noreturn_p = false; |
feb04535 | 8989 | ret->thread_p = false; |
d184e0c0 | 8990 | ret->thread_gnu_p = false; |
bb476216 | 8991 | ret->const_p = false; |
8992 | ret->volatile_p = false; | |
b560fabd | 8993 | ret->atomic_p = false; |
bb476216 | 8994 | ret->restrict_p = false; |
9421ebb9 | 8995 | ret->saturating_p = false; |
83e25171 | 8996 | ret->alignas_p = false; |
6d5d708e | 8997 | ret->address_space = ADDR_SPACE_GENERIC; |
ac206aff | 8998 | return ret; |
90cc7820 | 8999 | } |
1f3233d1 | 9000 | |
6d5d708e | 9001 | /* Add the address space ADDRSPACE to the declaration specifiers |
9002 | SPECS, returning SPECS. */ | |
9003 | ||
9004 | struct c_declspecs * | |
a60f3e81 | 9005 | declspecs_add_addrspace (source_location location, |
9006 | struct c_declspecs *specs, addr_space_t as) | |
6d5d708e | 9007 | { |
9008 | specs->non_sc_seen_p = true; | |
9009 | specs->declspecs_seen_p = true; | |
9010 | ||
9011 | if (!ADDR_SPACE_GENERIC_P (specs->address_space) | |
9012 | && specs->address_space != as) | |
9013 | error ("incompatible address space qualifiers %qs and %qs", | |
9014 | c_addr_space_name (as), | |
9015 | c_addr_space_name (specs->address_space)); | |
9016 | else | |
a60f3e81 | 9017 | { |
9018 | specs->address_space = as; | |
9019 | specs->locations[cdw_address_space] = location; | |
9020 | } | |
6d5d708e | 9021 | return specs; |
9022 | } | |
9023 | ||
9553111d | 9024 | /* Add the type qualifier QUAL to the declaration specifiers SPECS, |
9025 | returning SPECS. */ | |
9026 | ||
9027 | struct c_declspecs * | |
a60f3e81 | 9028 | declspecs_add_qual (source_location loc, |
9029 | struct c_declspecs *specs, tree qual) | |
9553111d | 9030 | { |
9031 | enum rid i; | |
bb476216 | 9032 | bool dupe = false; |
9553111d | 9033 | specs->non_sc_seen_p = true; |
1576dec7 | 9034 | specs->declspecs_seen_p = true; |
9553111d | 9035 | gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE |
9036 | && C_IS_RESERVED_WORD (qual)); | |
9037 | i = C_RID_CODE (qual); | |
bb476216 | 9038 | switch (i) |
9039 | { | |
9040 | case RID_CONST: | |
9041 | dupe = specs->const_p; | |
9042 | specs->const_p = true; | |
a60f3e81 | 9043 | specs->locations[cdw_const] = loc; |
bb476216 | 9044 | break; |
9045 | case RID_VOLATILE: | |
9046 | dupe = specs->volatile_p; | |
9047 | specs->volatile_p = true; | |
a60f3e81 | 9048 | specs->locations[cdw_volatile] = loc; |
bb476216 | 9049 | break; |
9050 | case RID_RESTRICT: | |
9051 | dupe = specs->restrict_p; | |
9052 | specs->restrict_p = true; | |
a60f3e81 | 9053 | specs->locations[cdw_restrict] = loc; |
bb476216 | 9054 | break; |
b560fabd | 9055 | case RID_ATOMIC: |
9056 | dupe = specs->atomic_p; | |
9057 | specs->atomic_p = true; | |
9058 | break; | |
bb476216 | 9059 | default: |
9060 | gcc_unreachable (); | |
9061 | } | |
8864917d | 9062 | if (dupe && !flag_isoc99) |
a60f3e81 | 9063 | pedwarn (loc, OPT_Wpedantic, "duplicate %qE", qual); |
9553111d | 9064 | return specs; |
9065 | } | |
9066 | ||
9067 | /* Add the type specifier TYPE to the declaration specifiers SPECS, | |
9068 | returning SPECS. */ | |
9069 | ||
9070 | struct c_declspecs * | |
843bd2fa | 9071 | declspecs_add_type (location_t loc, struct c_declspecs *specs, |
9072 | struct c_typespec spec) | |
9553111d | 9073 | { |
19702c1d | 9074 | tree type = spec.spec; |
9553111d | 9075 | specs->non_sc_seen_p = true; |
1576dec7 | 9076 | specs->declspecs_seen_p = true; |
ae5ead32 | 9077 | specs->typespec_kind = spec.kind; |
9553111d | 9078 | if (TREE_DEPRECATED (type)) |
9079 | specs->deprecated_p = true; | |
9553111d | 9080 | |
70dd11f7 | 9081 | /* Handle type specifier keywords. */ |
5c6e5756 | 9082 | if (TREE_CODE (type) == IDENTIFIER_NODE |
9083 | && C_IS_RESERVED_WORD (type) | |
9084 | && C_RID_CODE (type) != RID_CXX_COMPAT_WARN) | |
9553111d | 9085 | { |
9086 | enum rid i = C_RID_CODE (type); | |
70dd11f7 | 9087 | if (specs->type) |
9088 | { | |
843bd2fa | 9089 | error_at (loc, "two or more data types in declaration specifiers"); |
70dd11f7 | 9090 | return specs; |
9091 | } | |
9553111d | 9092 | if ((int) i <= (int) RID_LAST_MODIFIER) |
9093 | { | |
9421ebb9 | 9094 | /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */ |
70dd11f7 | 9095 | bool dupe = false; |
9096 | switch (i) | |
9553111d | 9097 | { |
70dd11f7 | 9098 | case RID_LONG: |
9553111d | 9099 | if (specs->long_long_p) |
9553111d | 9100 | { |
843bd2fa | 9101 | error_at (loc, "%<long long long%> is too long for GCC"); |
70dd11f7 | 9102 | break; |
9103 | } | |
9104 | if (specs->long_p) | |
9105 | { | |
9106 | if (specs->typespec_word == cts_double) | |
9107 | { | |
843bd2fa | 9108 | error_at (loc, |
9109 | ("both %<long long%> and %<double%> in " | |
9110 | "declaration specifiers")); | |
70dd11f7 | 9111 | break; |
9112 | } | |
843bd2fa | 9113 | pedwarn_c90 (loc, OPT_Wlong_long, |
9ab71c6b | 9114 | "ISO C90 does not support %<long long%>"); |
9553111d | 9115 | specs->long_long_p = 1; |
a60f3e81 | 9116 | specs->locations[cdw_long_long] = loc; |
70dd11f7 | 9117 | break; |
9553111d | 9118 | } |
70dd11f7 | 9119 | if (specs->short_p) |
843bd2fa | 9120 | error_at (loc, |
9121 | ("both %<long%> and %<short%> in " | |
9122 | "declaration specifiers")); | |
4fba5eb9 | 9123 | else if (specs->typespec_word == cts_auto_type) |
9124 | error_at (loc, | |
9125 | ("both %<long%> and %<__auto_type%> in " | |
9126 | "declaration specifiers")); | |
70dd11f7 | 9127 | else if (specs->typespec_word == cts_void) |
843bd2fa | 9128 | error_at (loc, |
9129 | ("both %<long%> and %<void%> in " | |
9130 | "declaration specifiers")); | |
6388cfe2 | 9131 | else if (specs->typespec_word == cts_int128) |
9132 | error_at (loc, | |
9133 | ("both %<long%> and %<__int128%> in " | |
9134 | "declaration specifiers")); | |
70dd11f7 | 9135 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 9136 | error_at (loc, |
9137 | ("both %<long%> and %<_Bool%> in " | |
9138 | "declaration specifiers")); | |
70dd11f7 | 9139 | else if (specs->typespec_word == cts_char) |
843bd2fa | 9140 | error_at (loc, |
9141 | ("both %<long%> and %<char%> in " | |
9142 | "declaration specifiers")); | |
70dd11f7 | 9143 | else if (specs->typespec_word == cts_float) |
843bd2fa | 9144 | error_at (loc, |
9145 | ("both %<long%> and %<float%> in " | |
9146 | "declaration specifiers")); | |
c4503c0a | 9147 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 9148 | error_at (loc, |
9149 | ("both %<long%> and %<_Decimal32%> in " | |
9150 | "declaration specifiers")); | |
c4503c0a | 9151 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 9152 | error_at (loc, |
9153 | ("both %<long%> and %<_Decimal64%> in " | |
9154 | "declaration specifiers")); | |
c4503c0a | 9155 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 9156 | error_at (loc, |
9157 | ("both %<long%> and %<_Decimal128%> in " | |
9158 | "declaration specifiers")); | |
70dd11f7 | 9159 | else |
a60f3e81 | 9160 | { |
9161 | specs->long_p = true; | |
9162 | specs->locations[cdw_long] = loc; | |
9163 | } | |
70dd11f7 | 9164 | break; |
9165 | case RID_SHORT: | |
9166 | dupe = specs->short_p; | |
9167 | if (specs->long_p) | |
843bd2fa | 9168 | error_at (loc, |
9169 | ("both %<long%> and %<short%> in " | |
9170 | "declaration specifiers")); | |
4fba5eb9 | 9171 | else if (specs->typespec_word == cts_auto_type) |
9172 | error_at (loc, | |
9173 | ("both %<short%> and %<__auto_type%> in " | |
9174 | "declaration specifiers")); | |
70dd11f7 | 9175 | else if (specs->typespec_word == cts_void) |
843bd2fa | 9176 | error_at (loc, |
9177 | ("both %<short%> and %<void%> in " | |
9178 | "declaration specifiers")); | |
6388cfe2 | 9179 | else if (specs->typespec_word == cts_int128) |
9180 | error_at (loc, | |
9181 | ("both %<short%> and %<__int128%> in " | |
9182 | "declaration specifiers")); | |
70dd11f7 | 9183 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 9184 | error_at (loc, |
9185 | ("both %<short%> and %<_Bool%> in " | |
9186 | "declaration specifiers")); | |
70dd11f7 | 9187 | else if (specs->typespec_word == cts_char) |
843bd2fa | 9188 | error_at (loc, |
9189 | ("both %<short%> and %<char%> in " | |
9190 | "declaration specifiers")); | |
70dd11f7 | 9191 | else if (specs->typespec_word == cts_float) |
843bd2fa | 9192 | error_at (loc, |
9193 | ("both %<short%> and %<float%> in " | |
9194 | "declaration specifiers")); | |
70dd11f7 | 9195 | else if (specs->typespec_word == cts_double) |
843bd2fa | 9196 | error_at (loc, |
9197 | ("both %<short%> and %<double%> in " | |
9198 | "declaration specifiers")); | |
c4503c0a | 9199 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 9200 | error_at (loc, |
9201 | ("both %<short%> and %<_Decimal32%> in " | |
9202 | "declaration specifiers")); | |
c4503c0a | 9203 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 9204 | error_at (loc, |
9205 | ("both %<short%> and %<_Decimal64%> in " | |
9206 | "declaration specifiers")); | |
c4503c0a | 9207 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 9208 | error_at (loc, |
9209 | ("both %<short%> and %<_Decimal128%> in " | |
9210 | "declaration specifiers")); | |
70dd11f7 | 9211 | else |
a60f3e81 | 9212 | { |
9213 | specs->short_p = true; | |
9214 | specs->locations[cdw_short] = loc; | |
9215 | } | |
70dd11f7 | 9216 | break; |
9217 | case RID_SIGNED: | |
9218 | dupe = specs->signed_p; | |
9219 | if (specs->unsigned_p) | |
843bd2fa | 9220 | error_at (loc, |
9221 | ("both %<signed%> and %<unsigned%> in " | |
9222 | "declaration specifiers")); | |
4fba5eb9 | 9223 | else if (specs->typespec_word == cts_auto_type) |
9224 | error_at (loc, | |
9225 | ("both %<signed%> and %<__auto_type%> in " | |
9226 | "declaration specifiers")); | |
70dd11f7 | 9227 | else if (specs->typespec_word == cts_void) |
843bd2fa | 9228 | error_at (loc, |
9229 | ("both %<signed%> and %<void%> in " | |
9230 | "declaration specifiers")); | |
70dd11f7 | 9231 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 9232 | error_at (loc, |
9233 | ("both %<signed%> and %<_Bool%> in " | |
9234 | "declaration specifiers")); | |
70dd11f7 | 9235 | else if (specs->typespec_word == cts_float) |
843bd2fa | 9236 | error_at (loc, |
9237 | ("both %<signed%> and %<float%> in " | |
9238 | "declaration specifiers")); | |
70dd11f7 | 9239 | else if (specs->typespec_word == cts_double) |
843bd2fa | 9240 | error_at (loc, |
9241 | ("both %<signed%> and %<double%> in " | |
9242 | "declaration specifiers")); | |
c4503c0a | 9243 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 9244 | error_at (loc, |
9245 | ("both %<signed%> and %<_Decimal32%> in " | |
9246 | "declaration specifiers")); | |
c4503c0a | 9247 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 9248 | error_at (loc, |
9249 | ("both %<signed%> and %<_Decimal64%> in " | |
9250 | "declaration specifiers")); | |
c4503c0a | 9251 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 9252 | error_at (loc, |
9253 | ("both %<signed%> and %<_Decimal128%> in " | |
9254 | "declaration specifiers")); | |
70dd11f7 | 9255 | else |
a60f3e81 | 9256 | { |
9257 | specs->signed_p = true; | |
9258 | specs->locations[cdw_signed] = loc; | |
9259 | } | |
70dd11f7 | 9260 | break; |
9261 | case RID_UNSIGNED: | |
9262 | dupe = specs->unsigned_p; | |
9263 | if (specs->signed_p) | |
843bd2fa | 9264 | error_at (loc, |
9265 | ("both %<signed%> and %<unsigned%> in " | |
9266 | "declaration specifiers")); | |
4fba5eb9 | 9267 | else if (specs->typespec_word == cts_auto_type) |
9268 | error_at (loc, | |
9269 | ("both %<unsigned%> and %<__auto_type%> in " | |
9270 | "declaration specifiers")); | |
70dd11f7 | 9271 | else if (specs->typespec_word == cts_void) |
843bd2fa | 9272 | error_at (loc, |
9273 | ("both %<unsigned%> and %<void%> in " | |
9274 | "declaration specifiers")); | |
70dd11f7 | 9275 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 9276 | error_at (loc, |
9277 | ("both %<unsigned%> and %<_Bool%> in " | |
9278 | "declaration specifiers")); | |
70dd11f7 | 9279 | else if (specs->typespec_word == cts_float) |
843bd2fa | 9280 | error_at (loc, |
9281 | ("both %<unsigned%> and %<float%> in " | |
9282 | "declaration specifiers")); | |
70dd11f7 | 9283 | else if (specs->typespec_word == cts_double) |
843bd2fa | 9284 | error_at (loc, |
9285 | ("both %<unsigned%> and %<double%> in " | |
9286 | "declaration specifiers")); | |
c4503c0a | 9287 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 9288 | error_at (loc, |
9289 | ("both %<unsigned%> and %<_Decimal32%> in " | |
9290 | "declaration specifiers")); | |
c4503c0a | 9291 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 9292 | error_at (loc, |
9293 | ("both %<unsigned%> and %<_Decimal64%> in " | |
9294 | "declaration specifiers")); | |
c4503c0a | 9295 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 9296 | error_at (loc, |
9297 | ("both %<unsigned%> and %<_Decimal128%> in " | |
9298 | "declaration specifiers")); | |
70dd11f7 | 9299 | else |
a60f3e81 | 9300 | { |
9301 | specs->unsigned_p = true; | |
9302 | specs->locations[cdw_unsigned] = loc; | |
9303 | } | |
70dd11f7 | 9304 | break; |
9305 | case RID_COMPLEX: | |
9306 | dupe = specs->complex_p; | |
a60f3e81 | 9307 | if (!flag_isoc99 && !in_system_header_at (loc)) |
29438999 | 9308 | pedwarn (loc, OPT_Wpedantic, |
843bd2fa | 9309 | "ISO C90 does not support complex types"); |
4fba5eb9 | 9310 | if (specs->typespec_word == cts_auto_type) |
9311 | error_at (loc, | |
9312 | ("both %<complex%> and %<__auto_type%> in " | |
9313 | "declaration specifiers")); | |
9314 | else if (specs->typespec_word == cts_void) | |
843bd2fa | 9315 | error_at (loc, |
9316 | ("both %<complex%> and %<void%> in " | |
9317 | "declaration specifiers")); | |
70dd11f7 | 9318 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 9319 | error_at (loc, |
9320 | ("both %<complex%> and %<_Bool%> in " | |
9321 | "declaration specifiers")); | |
c4503c0a | 9322 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 9323 | error_at (loc, |
9324 | ("both %<complex%> and %<_Decimal32%> in " | |
9325 | "declaration specifiers")); | |
c4503c0a | 9326 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 9327 | error_at (loc, |
9328 | ("both %<complex%> and %<_Decimal64%> in " | |
9329 | "declaration specifiers")); | |
c4503c0a | 9330 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 9331 | error_at (loc, |
9332 | ("both %<complex%> and %<_Decimal128%> in " | |
9333 | "declaration specifiers")); | |
9421ebb9 | 9334 | else if (specs->typespec_word == cts_fract) |
843bd2fa | 9335 | error_at (loc, |
9336 | ("both %<complex%> and %<_Fract%> in " | |
9337 | "declaration specifiers")); | |
9421ebb9 | 9338 | else if (specs->typespec_word == cts_accum) |
843bd2fa | 9339 | error_at (loc, |
9340 | ("both %<complex%> and %<_Accum%> in " | |
9341 | "declaration specifiers")); | |
9421ebb9 | 9342 | else if (specs->saturating_p) |
843bd2fa | 9343 | error_at (loc, |
9344 | ("both %<complex%> and %<_Sat%> in " | |
9345 | "declaration specifiers")); | |
70dd11f7 | 9346 | else |
a60f3e81 | 9347 | { |
9348 | specs->complex_p = true; | |
9349 | specs->locations[cdw_complex] = loc; | |
9350 | } | |
70dd11f7 | 9351 | break; |
9421ebb9 | 9352 | case RID_SAT: |
9353 | dupe = specs->saturating_p; | |
29438999 | 9354 | pedwarn (loc, OPT_Wpedantic, |
843bd2fa | 9355 | "ISO C does not support saturating types"); |
6388cfe2 | 9356 | if (specs->typespec_word == cts_int128) |
9357 | { | |
9358 | error_at (loc, | |
9359 | ("both %<_Sat%> and %<__int128%> in " | |
9360 | "declaration specifiers")); | |
9361 | } | |
4fba5eb9 | 9362 | else if (specs->typespec_word == cts_auto_type) |
9363 | error_at (loc, | |
9364 | ("both %<_Sat%> and %<__auto_type%> in " | |
9365 | "declaration specifiers")); | |
6388cfe2 | 9366 | else if (specs->typespec_word == cts_void) |
843bd2fa | 9367 | error_at (loc, |
9368 | ("both %<_Sat%> and %<void%> in " | |
9369 | "declaration specifiers")); | |
9421ebb9 | 9370 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 9371 | error_at (loc, |
9372 | ("both %<_Sat%> and %<_Bool%> in " | |
9373 | "declaration specifiers")); | |
9421ebb9 | 9374 | else if (specs->typespec_word == cts_char) |
843bd2fa | 9375 | error_at (loc, |
9376 | ("both %<_Sat%> and %<char%> in " | |
9377 | "declaration specifiers")); | |
9421ebb9 | 9378 | else if (specs->typespec_word == cts_int) |
843bd2fa | 9379 | error_at (loc, |
9380 | ("both %<_Sat%> and %<int%> in " | |
9381 | "declaration specifiers")); | |
9421ebb9 | 9382 | else if (specs->typespec_word == cts_float) |
843bd2fa | 9383 | error_at (loc, |
9384 | ("both %<_Sat%> and %<float%> in " | |
9385 | "declaration specifiers")); | |
9421ebb9 | 9386 | else if (specs->typespec_word == cts_double) |
843bd2fa | 9387 | error_at (loc, |
9388 | ("both %<_Sat%> and %<double%> in " | |
9389 | "declaration specifiers")); | |
9421ebb9 | 9390 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 9391 | error_at (loc, |
9392 | ("both %<_Sat%> and %<_Decimal32%> in " | |
9393 | "declaration specifiers")); | |
9421ebb9 | 9394 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 9395 | error_at (loc, |
9396 | ("both %<_Sat%> and %<_Decimal64%> in " | |
9397 | "declaration specifiers")); | |
9421ebb9 | 9398 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 9399 | error_at (loc, |
9400 | ("both %<_Sat%> and %<_Decimal128%> in " | |
9401 | "declaration specifiers")); | |
9421ebb9 | 9402 | else if (specs->complex_p) |
843bd2fa | 9403 | error_at (loc, |
9404 | ("both %<_Sat%> and %<complex%> in " | |
9405 | "declaration specifiers")); | |
9421ebb9 | 9406 | else |
a60f3e81 | 9407 | { |
9408 | specs->saturating_p = true; | |
9409 | specs->locations[cdw_saturating] = loc; | |
9410 | } | |
9421ebb9 | 9411 | break; |
70dd11f7 | 9412 | default: |
9413 | gcc_unreachable (); | |
9553111d | 9414 | } |
70dd11f7 | 9415 | |
9416 | if (dupe) | |
843bd2fa | 9417 | error_at (loc, "duplicate %qE", type); |
9553111d | 9418 | |
9553111d | 9419 | return specs; |
9420 | } | |
70dd11f7 | 9421 | else |
9422 | { | |
9421ebb9 | 9423 | /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32", |
4fba5eb9 | 9424 | "__int128", "_Decimal64", "_Decimal128", "_Fract", "_Accum" or |
9425 | "__auto_type". */ | |
70dd11f7 | 9426 | if (specs->typespec_word != cts_none) |
9427 | { | |
843bd2fa | 9428 | error_at (loc, |
9429 | "two or more data types in declaration specifiers"); | |
70dd11f7 | 9430 | return specs; |
9431 | } | |
9432 | switch (i) | |
9433 | { | |
4fba5eb9 | 9434 | case RID_AUTO_TYPE: |
9435 | if (specs->long_p) | |
9436 | error_at (loc, | |
9437 | ("both %<long%> and %<__auto_type%> in " | |
9438 | "declaration specifiers")); | |
9439 | else if (specs->short_p) | |
9440 | error_at (loc, | |
9441 | ("both %<short%> and %<__auto_type%> in " | |
9442 | "declaration specifiers")); | |
9443 | else if (specs->signed_p) | |
9444 | error_at (loc, | |
9445 | ("both %<signed%> and %<__auto_type%> in " | |
9446 | "declaration specifiers")); | |
9447 | else if (specs->unsigned_p) | |
9448 | error_at (loc, | |
9449 | ("both %<unsigned%> and %<__auto_type%> in " | |
9450 | "declaration specifiers")); | |
9451 | else if (specs->complex_p) | |
9452 | error_at (loc, | |
9453 | ("both %<complex%> and %<__auto_type%> in " | |
9454 | "declaration specifiers")); | |
9455 | else if (specs->saturating_p) | |
9456 | error_at (loc, | |
9457 | ("both %<_Sat%> and %<__auto_type%> in " | |
9458 | "declaration specifiers")); | |
9459 | else | |
9460 | { | |
9461 | specs->typespec_word = cts_auto_type; | |
9462 | specs->locations[cdw_typespec] = loc; | |
9463 | } | |
9464 | return specs; | |
6388cfe2 | 9465 | case RID_INT128: |
9466 | if (int128_integer_type_node == NULL_TREE) | |
9467 | { | |
9468 | error_at (loc, "%<__int128%> is not supported for this target"); | |
9469 | return specs; | |
9470 | } | |
9471 | if (!in_system_header) | |
29438999 | 9472 | pedwarn (loc, OPT_Wpedantic, |
6388cfe2 | 9473 | "ISO C does not support %<__int128%> type"); |
9474 | ||
9475 | if (specs->long_p) | |
9476 | error_at (loc, | |
9477 | ("both %<__int128%> and %<long%> in " | |
9478 | "declaration specifiers")); | |
9479 | else if (specs->saturating_p) | |
9480 | error_at (loc, | |
9481 | ("both %<_Sat%> and %<__int128%> in " | |
9482 | "declaration specifiers")); | |
9483 | else if (specs->short_p) | |
9484 | error_at (loc, | |
9485 | ("both %<__int128%> and %<short%> in " | |
9486 | "declaration specifiers")); | |
9487 | else | |
a60f3e81 | 9488 | { |
9489 | specs->typespec_word = cts_int128; | |
9490 | specs->locations[cdw_typespec] = loc; | |
9491 | } | |
6388cfe2 | 9492 | return specs; |
70dd11f7 | 9493 | case RID_VOID: |
9494 | if (specs->long_p) | |
843bd2fa | 9495 | error_at (loc, |
9496 | ("both %<long%> and %<void%> in " | |
9497 | "declaration specifiers")); | |
70dd11f7 | 9498 | else if (specs->short_p) |
843bd2fa | 9499 | error_at (loc, |
9500 | ("both %<short%> and %<void%> in " | |
9501 | "declaration specifiers")); | |
70dd11f7 | 9502 | else if (specs->signed_p) |
843bd2fa | 9503 | error_at (loc, |
9504 | ("both %<signed%> and %<void%> in " | |
9505 | "declaration specifiers")); | |
70dd11f7 | 9506 | else if (specs->unsigned_p) |
843bd2fa | 9507 | error_at (loc, |
9508 | ("both %<unsigned%> and %<void%> in " | |
9509 | "declaration specifiers")); | |
70dd11f7 | 9510 | else if (specs->complex_p) |
843bd2fa | 9511 | error_at (loc, |
9512 | ("both %<complex%> and %<void%> in " | |
9513 | "declaration specifiers")); | |
9421ebb9 | 9514 | else if (specs->saturating_p) |
843bd2fa | 9515 | error_at (loc, |
9516 | ("both %<_Sat%> and %<void%> in " | |
9517 | "declaration specifiers")); | |
70dd11f7 | 9518 | else |
a60f3e81 | 9519 | { |
9520 | specs->typespec_word = cts_void; | |
9521 | specs->locations[cdw_typespec] = loc; | |
9522 | } | |
70dd11f7 | 9523 | return specs; |
9524 | case RID_BOOL: | |
9525 | if (specs->long_p) | |
843bd2fa | 9526 | error_at (loc, |
9527 | ("both %<long%> and %<_Bool%> in " | |
9528 | "declaration specifiers")); | |
70dd11f7 | 9529 | else if (specs->short_p) |
843bd2fa | 9530 | error_at (loc, |
9531 | ("both %<short%> and %<_Bool%> in " | |
9532 | "declaration specifiers")); | |
70dd11f7 | 9533 | else if (specs->signed_p) |
843bd2fa | 9534 | error_at (loc, |
9535 | ("both %<signed%> and %<_Bool%> in " | |
9536 | "declaration specifiers")); | |
70dd11f7 | 9537 | else if (specs->unsigned_p) |
843bd2fa | 9538 | error_at (loc, |
9539 | ("both %<unsigned%> and %<_Bool%> in " | |
9540 | "declaration specifiers")); | |
70dd11f7 | 9541 | else if (specs->complex_p) |
843bd2fa | 9542 | error_at (loc, |
9543 | ("both %<complex%> and %<_Bool%> in " | |
9544 | "declaration specifiers")); | |
9421ebb9 | 9545 | else if (specs->saturating_p) |
843bd2fa | 9546 | error_at (loc, |
9547 | ("both %<_Sat%> and %<_Bool%> in " | |
9548 | "declaration specifiers")); | |
70dd11f7 | 9549 | else |
a60f3e81 | 9550 | { |
9551 | specs->typespec_word = cts_bool; | |
9552 | specs->locations[cdw_typespec] = loc; | |
9553 | } | |
70dd11f7 | 9554 | return specs; |
9555 | case RID_CHAR: | |
9556 | if (specs->long_p) | |
843bd2fa | 9557 | error_at (loc, |
9558 | ("both %<long%> and %<char%> in " | |
9559 | "declaration specifiers")); | |
70dd11f7 | 9560 | else if (specs->short_p) |
843bd2fa | 9561 | error_at (loc, |
9562 | ("both %<short%> and %<char%> in " | |
9563 | "declaration specifiers")); | |
9421ebb9 | 9564 | else if (specs->saturating_p) |
843bd2fa | 9565 | error_at (loc, |
9566 | ("both %<_Sat%> and %<char%> in " | |
9567 | "declaration specifiers")); | |
70dd11f7 | 9568 | else |
a60f3e81 | 9569 | { |
9570 | specs->typespec_word = cts_char; | |
9571 | specs->locations[cdw_typespec] = loc; | |
9572 | } | |
70dd11f7 | 9573 | return specs; |
9574 | case RID_INT: | |
9421ebb9 | 9575 | if (specs->saturating_p) |
843bd2fa | 9576 | error_at (loc, |
9577 | ("both %<_Sat%> and %<int%> in " | |
9578 | "declaration specifiers")); | |
9421ebb9 | 9579 | else |
a60f3e81 | 9580 | { |
9581 | specs->typespec_word = cts_int; | |
9582 | specs->locations[cdw_typespec] = loc; | |
9583 | } | |
70dd11f7 | 9584 | return specs; |
9585 | case RID_FLOAT: | |
9586 | if (specs->long_p) | |
843bd2fa | 9587 | error_at (loc, |
9588 | ("both %<long%> and %<float%> in " | |
9589 | "declaration specifiers")); | |
70dd11f7 | 9590 | else if (specs->short_p) |
843bd2fa | 9591 | error_at (loc, |
9592 | ("both %<short%> and %<float%> in " | |
9593 | "declaration specifiers")); | |
70dd11f7 | 9594 | else if (specs->signed_p) |
843bd2fa | 9595 | error_at (loc, |
9596 | ("both %<signed%> and %<float%> in " | |
9597 | "declaration specifiers")); | |
70dd11f7 | 9598 | else if (specs->unsigned_p) |
843bd2fa | 9599 | error_at (loc, |
9600 | ("both %<unsigned%> and %<float%> in " | |
9601 | "declaration specifiers")); | |
9421ebb9 | 9602 | else if (specs->saturating_p) |
843bd2fa | 9603 | error_at (loc, |
9604 | ("both %<_Sat%> and %<float%> in " | |
9605 | "declaration specifiers")); | |
70dd11f7 | 9606 | else |
a60f3e81 | 9607 | { |
9608 | specs->typespec_word = cts_float; | |
9609 | specs->locations[cdw_typespec] = loc; | |
9610 | } | |
70dd11f7 | 9611 | return specs; |
9612 | case RID_DOUBLE: | |
9613 | if (specs->long_long_p) | |
843bd2fa | 9614 | error_at (loc, |
9615 | ("both %<long long%> and %<double%> in " | |
9616 | "declaration specifiers")); | |
70dd11f7 | 9617 | else if (specs->short_p) |
843bd2fa | 9618 | error_at (loc, |
9619 | ("both %<short%> and %<double%> in " | |
9620 | "declaration specifiers")); | |
70dd11f7 | 9621 | else if (specs->signed_p) |
843bd2fa | 9622 | error_at (loc, |
9623 | ("both %<signed%> and %<double%> in " | |
9624 | "declaration specifiers")); | |
70dd11f7 | 9625 | else if (specs->unsigned_p) |
843bd2fa | 9626 | error_at (loc, |
9627 | ("both %<unsigned%> and %<double%> in " | |
9628 | "declaration specifiers")); | |
9421ebb9 | 9629 | else if (specs->saturating_p) |
843bd2fa | 9630 | error_at (loc, |
9631 | ("both %<_Sat%> and %<double%> in " | |
9632 | "declaration specifiers")); | |
70dd11f7 | 9633 | else |
a60f3e81 | 9634 | { |
9635 | specs->typespec_word = cts_double; | |
9636 | specs->locations[cdw_typespec] = loc; | |
9637 | } | |
70dd11f7 | 9638 | return specs; |
c4503c0a | 9639 | case RID_DFLOAT32: |
9640 | case RID_DFLOAT64: | |
9641 | case RID_DFLOAT128: | |
48e1416a | 9642 | { |
c4503c0a | 9643 | const char *str; |
9644 | if (i == RID_DFLOAT32) | |
9645 | str = "_Decimal32"; | |
9646 | else if (i == RID_DFLOAT64) | |
9647 | str = "_Decimal64"; | |
9648 | else | |
9649 | str = "_Decimal128"; | |
9650 | if (specs->long_long_p) | |
843bd2fa | 9651 | error_at (loc, |
9652 | ("both %<long long%> and %<%s%> in " | |
9653 | "declaration specifiers"), | |
9654 | str); | |
c4503c0a | 9655 | if (specs->long_p) |
843bd2fa | 9656 | error_at (loc, |
9657 | ("both %<long%> and %<%s%> in " | |
9658 | "declaration specifiers"), | |
9659 | str); | |
c4503c0a | 9660 | else if (specs->short_p) |
843bd2fa | 9661 | error_at (loc, |
9662 | ("both %<short%> and %<%s%> in " | |
9663 | "declaration specifiers"), | |
9664 | str); | |
c4503c0a | 9665 | else if (specs->signed_p) |
843bd2fa | 9666 | error_at (loc, |
9667 | ("both %<signed%> and %<%s%> in " | |
9668 | "declaration specifiers"), | |
9669 | str); | |
c4503c0a | 9670 | else if (specs->unsigned_p) |
843bd2fa | 9671 | error_at (loc, |
9672 | ("both %<unsigned%> and %<%s%> in " | |
9673 | "declaration specifiers"), | |
9674 | str); | |
c4503c0a | 9675 | else if (specs->complex_p) |
843bd2fa | 9676 | error_at (loc, |
9677 | ("both %<complex%> and %<%s%> in " | |
9678 | "declaration specifiers"), | |
9679 | str); | |
9421ebb9 | 9680 | else if (specs->saturating_p) |
843bd2fa | 9681 | error_at (loc, |
9682 | ("both %<_Sat%> and %<%s%> in " | |
9683 | "declaration specifiers"), | |
9684 | str); | |
c4503c0a | 9685 | else if (i == RID_DFLOAT32) |
9686 | specs->typespec_word = cts_dfloat32; | |
9687 | else if (i == RID_DFLOAT64) | |
9688 | specs->typespec_word = cts_dfloat64; | |
9689 | else | |
9690 | specs->typespec_word = cts_dfloat128; | |
a60f3e81 | 9691 | specs->locations[cdw_typespec] = loc; |
c4503c0a | 9692 | } |
9693 | if (!targetm.decimal_float_supported_p ()) | |
843bd2fa | 9694 | error_at (loc, |
9695 | ("decimal floating point not supported " | |
9696 | "for this target")); | |
29438999 | 9697 | pedwarn (loc, OPT_Wpedantic, |
8864917d | 9698 | "ISO C does not support decimal floating point"); |
c4503c0a | 9699 | return specs; |
9421ebb9 | 9700 | case RID_FRACT: |
9701 | case RID_ACCUM: | |
9702 | { | |
9703 | const char *str; | |
9704 | if (i == RID_FRACT) | |
9705 | str = "_Fract"; | |
9706 | else | |
9707 | str = "_Accum"; | |
9708 | if (specs->complex_p) | |
843bd2fa | 9709 | error_at (loc, |
9710 | ("both %<complex%> and %<%s%> in " | |
9711 | "declaration specifiers"), | |
9712 | str); | |
9421ebb9 | 9713 | else if (i == RID_FRACT) |
9714 | specs->typespec_word = cts_fract; | |
9715 | else | |
9716 | specs->typespec_word = cts_accum; | |
a60f3e81 | 9717 | specs->locations[cdw_typespec] = loc; |
9421ebb9 | 9718 | } |
9719 | if (!targetm.fixed_point_supported_p ()) | |
843bd2fa | 9720 | error_at (loc, |
9721 | "fixed-point types not supported for this target"); | |
29438999 | 9722 | pedwarn (loc, OPT_Wpedantic, |
8864917d | 9723 | "ISO C does not support fixed-point types"); |
9421ebb9 | 9724 | return specs; |
70dd11f7 | 9725 | default: |
9726 | /* ObjC reserved word "id", handled below. */ | |
9727 | break; | |
9728 | } | |
9729 | } | |
9553111d | 9730 | } |
70dd11f7 | 9731 | |
9732 | /* Now we have a typedef (a TYPE_DECL node), an identifier (some | |
9733 | form of ObjC type, cases such as "int" and "long" being handled | |
9734 | above), a TYPE (struct, union, enum and typeof specifiers) or an | |
9735 | ERROR_MARK. In none of these cases may there have previously | |
9736 | been any type specifiers. */ | |
9737 | if (specs->type || specs->typespec_word != cts_none | |
9738 | || specs->long_p || specs->short_p || specs->signed_p | |
9739 | || specs->unsigned_p || specs->complex_p) | |
843bd2fa | 9740 | error_at (loc, "two or more data types in declaration specifiers"); |
9553111d | 9741 | else if (TREE_CODE (type) == TYPE_DECL) |
9742 | { | |
9743 | if (TREE_TYPE (type) == error_mark_node) | |
9744 | ; /* Allow the type to default to int to avoid cascading errors. */ | |
9745 | else | |
9746 | { | |
9747 | specs->type = TREE_TYPE (type); | |
9748 | specs->decl_attr = DECL_ATTRIBUTES (type); | |
490eec42 | 9749 | specs->typedef_p = true; |
70dd11f7 | 9750 | specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type); |
a60f3e81 | 9751 | specs->locations[cdw_typedef] = loc; |
843bd2fa | 9752 | |
9753 | /* If this typedef name is defined in a struct, then a C++ | |
9754 | lookup would return a different value. */ | |
9755 | if (warn_cxx_compat | |
9756 | && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct) | |
9757 | warning_at (loc, OPT_Wc___compat, | |
9758 | "C++ lookup of %qD would return a field, not a type", | |
9759 | type); | |
9760 | ||
9761 | /* If we are parsing a struct, record that a struct field | |
9762 | used a typedef. */ | |
9763 | if (warn_cxx_compat && struct_parse_info != NULL) | |
f1f41a6c | 9764 | struct_parse_info->typedefs_seen.safe_push (type); |
9553111d | 9765 | } |
9766 | } | |
9553111d | 9767 | else if (TREE_CODE (type) == IDENTIFIER_NODE) |
9768 | { | |
9769 | tree t = lookup_name (type); | |
9770 | if (!t || TREE_CODE (t) != TYPE_DECL) | |
843bd2fa | 9771 | error_at (loc, "%qE fails to be a typedef or built in type", type); |
9553111d | 9772 | else if (TREE_TYPE (t) == error_mark_node) |
9773 | ; | |
9774 | else | |
a60f3e81 | 9775 | { |
9776 | specs->type = TREE_TYPE (t); | |
9777 | specs->locations[cdw_typespec] = loc; | |
9778 | } | |
9553111d | 9779 | } |
26ee9e7a | 9780 | else |
19702c1d | 9781 | { |
26ee9e7a | 9782 | if (TREE_CODE (type) != ERROR_MARK && spec.kind == ctsk_typeof) |
a75b1c71 | 9783 | { |
9784 | specs->typedef_p = true; | |
a60f3e81 | 9785 | specs->locations[cdw_typedef] = loc; |
a75b1c71 | 9786 | if (spec.expr) |
9787 | { | |
9788 | if (specs->expr) | |
9789 | specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr), | |
9790 | specs->expr, spec.expr); | |
9791 | else | |
9792 | specs->expr = spec.expr; | |
9793 | specs->expr_const_operands &= spec.expr_const_operands; | |
9794 | } | |
9795 | } | |
19702c1d | 9796 | specs->type = type; |
9797 | } | |
9553111d | 9798 | |
9799 | return specs; | |
9800 | } | |
9801 | ||
9802 | /* Add the storage class specifier or function specifier SCSPEC to the | |
9803 | declaration specifiers SPECS, returning SPECS. */ | |
9804 | ||
9805 | struct c_declspecs * | |
a60f3e81 | 9806 | declspecs_add_scspec (source_location loc, |
9807 | struct c_declspecs *specs, | |
9808 | tree scspec) | |
9553111d | 9809 | { |
9810 | enum rid i; | |
feb04535 | 9811 | enum c_storage_class n = csc_none; |
9812 | bool dupe = false; | |
1576dec7 | 9813 | specs->declspecs_seen_p = true; |
9553111d | 9814 | gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE |
9815 | && C_IS_RESERVED_WORD (scspec)); | |
9816 | i = C_RID_CODE (scspec); | |
02619052 | 9817 | if (specs->non_sc_seen_p) |
48e1416a | 9818 | warning (OPT_Wold_style_declaration, |
02619052 | 9819 | "%qE is not at beginning of declaration", scspec); |
feb04535 | 9820 | switch (i) |
9821 | { | |
9822 | case RID_INLINE: | |
ebdbd341 | 9823 | /* C99 permits duplicate inline. Although of doubtful utility, |
9824 | it seems simplest to permit it in gnu89 mode as well, as | |
9825 | there is also little utility in maintaining this as a | |
9826 | difference between gnu89 and C99 inline. */ | |
9827 | dupe = false; | |
feb04535 | 9828 | specs->inline_p = true; |
a60f3e81 | 9829 | specs->locations[cdw_inline] = loc; |
feb04535 | 9830 | break; |
985c6e3a | 9831 | case RID_NORETURN: |
9832 | /* Duplicate _Noreturn is permitted. */ | |
9833 | dupe = false; | |
9834 | specs->noreturn_p = true; | |
a60f3e81 | 9835 | specs->locations[cdw_noreturn] = loc; |
985c6e3a | 9836 | break; |
feb04535 | 9837 | case RID_THREAD: |
9838 | dupe = specs->thread_p; | |
9839 | if (specs->storage_class == csc_auto) | |
d184e0c0 | 9840 | error ("%qE used with %<auto%>", scspec); |
feb04535 | 9841 | else if (specs->storage_class == csc_register) |
d184e0c0 | 9842 | error ("%qE used with %<register%>", scspec); |
feb04535 | 9843 | else if (specs->storage_class == csc_typedef) |
d184e0c0 | 9844 | error ("%qE used with %<typedef%>", scspec); |
feb04535 | 9845 | else |
a60f3e81 | 9846 | { |
9847 | specs->thread_p = true; | |
d184e0c0 | 9848 | specs->thread_gnu_p = (strcmp (IDENTIFIER_POINTER (scspec), |
9849 | "__thread") == 0); | |
9850 | /* A diagnostic is not required for the use of this | |
9851 | identifier in the implementation namespace; only diagnose | |
9852 | it for the C11 spelling because of existing code using | |
9853 | the other spelling. */ | |
9854 | if (!flag_isoc11 && !specs->thread_gnu_p) | |
9855 | { | |
9856 | if (flag_isoc99) | |
9857 | pedwarn (loc, OPT_Wpedantic, | |
9858 | "ISO C99 does not support %qE", scspec); | |
9859 | else | |
9860 | pedwarn (loc, OPT_Wpedantic, | |
9861 | "ISO C90 does not support %qE", scspec); | |
9862 | } | |
a60f3e81 | 9863 | specs->locations[cdw_thread] = loc; |
9864 | } | |
feb04535 | 9865 | break; |
9866 | case RID_AUTO: | |
9867 | n = csc_auto; | |
9868 | break; | |
9869 | case RID_EXTERN: | |
9870 | n = csc_extern; | |
9871 | /* Diagnose "__thread extern". */ | |
d184e0c0 | 9872 | if (specs->thread_p && specs->thread_gnu_p) |
9553111d | 9873 | error ("%<__thread%> before %<extern%>"); |
feb04535 | 9874 | break; |
9875 | case RID_REGISTER: | |
9876 | n = csc_register; | |
9877 | break; | |
9878 | case RID_STATIC: | |
9879 | n = csc_static; | |
9880 | /* Diagnose "__thread static". */ | |
d184e0c0 | 9881 | if (specs->thread_p && specs->thread_gnu_p) |
9553111d | 9882 | error ("%<__thread%> before %<static%>"); |
feb04535 | 9883 | break; |
9884 | case RID_TYPEDEF: | |
9885 | n = csc_typedef; | |
9886 | break; | |
9887 | default: | |
9888 | gcc_unreachable (); | |
9889 | } | |
9890 | if (n != csc_none && n == specs->storage_class) | |
9891 | dupe = true; | |
9892 | if (dupe) | |
d184e0c0 | 9893 | { |
9894 | if (i == RID_THREAD) | |
9895 | error ("duplicate %<_Thread_local%> or %<__thread%>"); | |
9896 | else | |
9897 | error ("duplicate %qE", scspec); | |
9898 | } | |
feb04535 | 9899 | if (n != csc_none) |
9900 | { | |
9901 | if (specs->storage_class != csc_none && n != specs->storage_class) | |
9902 | { | |
9903 | error ("multiple storage classes in declaration specifiers"); | |
9904 | } | |
9905 | else | |
9906 | { | |
9907 | specs->storage_class = n; | |
a60f3e81 | 9908 | specs->locations[cdw_storage_class] = loc; |
feb04535 | 9909 | if (n != csc_extern && n != csc_static && specs->thread_p) |
9910 | { | |
d184e0c0 | 9911 | error ("%qs used with %qE", |
9912 | specs->thread_gnu_p ? "__thread" : "_Thread_local", | |
9913 | scspec); | |
feb04535 | 9914 | specs->thread_p = false; |
9915 | } | |
9916 | } | |
9553111d | 9917 | } |
9553111d | 9918 | return specs; |
9919 | } | |
9920 | ||
9921 | /* Add the attributes ATTRS to the declaration specifiers SPECS, | |
9922 | returning SPECS. */ | |
9923 | ||
9924 | struct c_declspecs * | |
a60f3e81 | 9925 | declspecs_add_attrs (source_location loc, struct c_declspecs *specs, tree attrs) |
9553111d | 9926 | { |
9927 | specs->attrs = chainon (attrs, specs->attrs); | |
a60f3e81 | 9928 | specs->locations[cdw_attributes] = loc; |
1576dec7 | 9929 | specs->declspecs_seen_p = true; |
9553111d | 9930 | return specs; |
9931 | } | |
9932 | ||
83e25171 | 9933 | /* Add an _Alignas specifier (expression ALIGN, or type whose |
9934 | alignment is ALIGN) to the declaration specifiers SPECS, returning | |
9935 | SPECS. */ | |
9936 | struct c_declspecs * | |
a60f3e81 | 9937 | declspecs_add_alignas (source_location loc, |
9938 | struct c_declspecs *specs, tree align) | |
83e25171 | 9939 | { |
9940 | int align_log; | |
9941 | specs->alignas_p = true; | |
a60f3e81 | 9942 | specs->locations[cdw_alignas] = loc; |
83e25171 | 9943 | if (align == error_mark_node) |
9944 | return specs; | |
9945 | align_log = check_user_alignment (align, true); | |
9946 | if (align_log > specs->align_log) | |
9947 | specs->align_log = align_log; | |
9948 | return specs; | |
9949 | } | |
9950 | ||
70dd11f7 | 9951 | /* Combine "long", "short", "signed", "unsigned" and "_Complex" type |
9952 | specifiers with any other type specifier to determine the resulting | |
9953 | type. This is where ISO C checks on complex types are made, since | |
9954 | "_Complex long" is a prefix of the valid ISO C type "_Complex long | |
9955 | double". */ | |
9956 | ||
9957 | struct c_declspecs * | |
9958 | finish_declspecs (struct c_declspecs *specs) | |
9959 | { | |
9960 | /* If a type was specified as a whole, we have no modifiers and are | |
9961 | done. */ | |
9962 | if (specs->type != NULL_TREE) | |
9963 | { | |
9964 | gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p | |
9965 | && !specs->signed_p && !specs->unsigned_p | |
9966 | && !specs->complex_p); | |
26ee9e7a | 9967 | |
9968 | /* Set a dummy type. */ | |
9969 | if (TREE_CODE (specs->type) == ERROR_MARK) | |
9970 | specs->type = integer_type_node; | |
70dd11f7 | 9971 | return specs; |
9972 | } | |
9973 | ||
9974 | /* If none of "void", "_Bool", "char", "int", "float" or "double" | |
9975 | has been specified, treat it as "int" unless "_Complex" is | |
9976 | present and there are no other specifiers. If we just have | |
9977 | "_Complex", it is equivalent to "_Complex double", but e.g. | |
9978 | "_Complex short" is equivalent to "_Complex short int". */ | |
9979 | if (specs->typespec_word == cts_none) | |
9980 | { | |
9421ebb9 | 9981 | if (specs->saturating_p) |
84786a68 | 9982 | { |
a60f3e81 | 9983 | error_at (specs->locations[cdw_saturating], |
9984 | "%<_Sat%> is used without %<_Fract%> or %<_Accum%>"); | |
14e882ea | 9985 | if (!targetm.fixed_point_supported_p ()) |
a60f3e81 | 9986 | error_at (specs->locations[cdw_saturating], |
9987 | "fixed-point types not supported for this target"); | |
84786a68 | 9988 | specs->typespec_word = cts_fract; |
9989 | } | |
9990 | else if (specs->long_p || specs->short_p | |
9991 | || specs->signed_p || specs->unsigned_p) | |
70dd11f7 | 9992 | { |
9993 | specs->typespec_word = cts_int; | |
9994 | } | |
9995 | else if (specs->complex_p) | |
9996 | { | |
9997 | specs->typespec_word = cts_double; | |
a60f3e81 | 9998 | pedwarn (specs->locations[cdw_complex], OPT_Wpedantic, |
8864917d | 9999 | "ISO C does not support plain %<complex%> meaning " |
10000 | "%<double complex%>"); | |
70dd11f7 | 10001 | } |
10002 | else | |
10003 | { | |
10004 | specs->typespec_word = cts_int; | |
10005 | specs->default_int_p = true; | |
10006 | /* We don't diagnose this here because grokdeclarator will | |
10007 | give more specific diagnostics according to whether it is | |
10008 | a function definition. */ | |
10009 | } | |
10010 | } | |
10011 | ||
10012 | /* If "signed" was specified, record this to distinguish "int" and | |
10013 | "signed int" in the case of a bit-field with | |
10014 | -funsigned-bitfields. */ | |
10015 | specs->explicit_signed_p = specs->signed_p; | |
10016 | ||
10017 | /* Now compute the actual type. */ | |
10018 | switch (specs->typespec_word) | |
10019 | { | |
4fba5eb9 | 10020 | case cts_auto_type: |
10021 | gcc_assert (!specs->long_p && !specs->short_p | |
10022 | && !specs->signed_p && !specs->unsigned_p | |
10023 | && !specs->complex_p); | |
10024 | /* Type to be filled in later. */ | |
10025 | break; | |
70dd11f7 | 10026 | case cts_void: |
10027 | gcc_assert (!specs->long_p && !specs->short_p | |
10028 | && !specs->signed_p && !specs->unsigned_p | |
10029 | && !specs->complex_p); | |
10030 | specs->type = void_type_node; | |
10031 | break; | |
10032 | case cts_bool: | |
10033 | gcc_assert (!specs->long_p && !specs->short_p | |
10034 | && !specs->signed_p && !specs->unsigned_p | |
10035 | && !specs->complex_p); | |
10036 | specs->type = boolean_type_node; | |
10037 | break; | |
10038 | case cts_char: | |
10039 | gcc_assert (!specs->long_p && !specs->short_p); | |
10040 | gcc_assert (!(specs->signed_p && specs->unsigned_p)); | |
10041 | if (specs->signed_p) | |
10042 | specs->type = signed_char_type_node; | |
10043 | else if (specs->unsigned_p) | |
10044 | specs->type = unsigned_char_type_node; | |
10045 | else | |
10046 | specs->type = char_type_node; | |
10047 | if (specs->complex_p) | |
10048 | { | |
a60f3e81 | 10049 | pedwarn (specs->locations[cdw_complex], OPT_Wpedantic, |
8864917d | 10050 | "ISO C does not support complex integer types"); |
70dd11f7 | 10051 | specs->type = build_complex_type (specs->type); |
10052 | } | |
10053 | break; | |
6388cfe2 | 10054 | case cts_int128: |
10055 | gcc_assert (!specs->long_p && !specs->short_p && !specs->long_long_p); | |
10056 | gcc_assert (!(specs->signed_p && specs->unsigned_p)); | |
10057 | specs->type = (specs->unsigned_p | |
10058 | ? int128_unsigned_type_node | |
10059 | : int128_integer_type_node); | |
10060 | if (specs->complex_p) | |
10061 | { | |
a60f3e81 | 10062 | pedwarn (specs->locations[cdw_complex], OPT_Wpedantic, |
6388cfe2 | 10063 | "ISO C does not support complex integer types"); |
10064 | specs->type = build_complex_type (specs->type); | |
10065 | } | |
10066 | break; | |
70dd11f7 | 10067 | case cts_int: |
10068 | gcc_assert (!(specs->long_p && specs->short_p)); | |
10069 | gcc_assert (!(specs->signed_p && specs->unsigned_p)); | |
10070 | if (specs->long_long_p) | |
10071 | specs->type = (specs->unsigned_p | |
10072 | ? long_long_unsigned_type_node | |
10073 | : long_long_integer_type_node); | |
10074 | else if (specs->long_p) | |
10075 | specs->type = (specs->unsigned_p | |
10076 | ? long_unsigned_type_node | |
10077 | : long_integer_type_node); | |
10078 | else if (specs->short_p) | |
10079 | specs->type = (specs->unsigned_p | |
10080 | ? short_unsigned_type_node | |
10081 | : short_integer_type_node); | |
10082 | else | |
10083 | specs->type = (specs->unsigned_p | |
10084 | ? unsigned_type_node | |
10085 | : integer_type_node); | |
10086 | if (specs->complex_p) | |
10087 | { | |
a60f3e81 | 10088 | pedwarn (specs->locations[cdw_complex], OPT_Wpedantic, |
8864917d | 10089 | "ISO C does not support complex integer types"); |
70dd11f7 | 10090 | specs->type = build_complex_type (specs->type); |
10091 | } | |
10092 | break; | |
10093 | case cts_float: | |
10094 | gcc_assert (!specs->long_p && !specs->short_p | |
10095 | && !specs->signed_p && !specs->unsigned_p); | |
10096 | specs->type = (specs->complex_p | |
10097 | ? complex_float_type_node | |
10098 | : float_type_node); | |
10099 | break; | |
10100 | case cts_double: | |
10101 | gcc_assert (!specs->long_long_p && !specs->short_p | |
10102 | && !specs->signed_p && !specs->unsigned_p); | |
10103 | if (specs->long_p) | |
10104 | { | |
10105 | specs->type = (specs->complex_p | |
10106 | ? complex_long_double_type_node | |
10107 | : long_double_type_node); | |
10108 | } | |
10109 | else | |
10110 | { | |
10111 | specs->type = (specs->complex_p | |
10112 | ? complex_double_type_node | |
10113 | : double_type_node); | |
10114 | } | |
10115 | break; | |
c4503c0a | 10116 | case cts_dfloat32: |
10117 | case cts_dfloat64: | |
10118 | case cts_dfloat128: | |
10119 | gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p | |
10120 | && !specs->signed_p && !specs->unsigned_p && !specs->complex_p); | |
10121 | if (specs->typespec_word == cts_dfloat32) | |
10122 | specs->type = dfloat32_type_node; | |
10123 | else if (specs->typespec_word == cts_dfloat64) | |
10124 | specs->type = dfloat64_type_node; | |
10125 | else | |
10126 | specs->type = dfloat128_type_node; | |
10127 | break; | |
9421ebb9 | 10128 | case cts_fract: |
14e882ea | 10129 | gcc_assert (!specs->complex_p); |
10130 | if (!targetm.fixed_point_supported_p ()) | |
10131 | specs->type = integer_type_node; | |
10132 | else if (specs->saturating_p) | |
9421ebb9 | 10133 | { |
10134 | if (specs->long_long_p) | |
10135 | specs->type = specs->unsigned_p | |
10136 | ? sat_unsigned_long_long_fract_type_node | |
10137 | : sat_long_long_fract_type_node; | |
10138 | else if (specs->long_p) | |
10139 | specs->type = specs->unsigned_p | |
10140 | ? sat_unsigned_long_fract_type_node | |
10141 | : sat_long_fract_type_node; | |
10142 | else if (specs->short_p) | |
10143 | specs->type = specs->unsigned_p | |
10144 | ? sat_unsigned_short_fract_type_node | |
10145 | : sat_short_fract_type_node; | |
10146 | else | |
10147 | specs->type = specs->unsigned_p | |
10148 | ? sat_unsigned_fract_type_node | |
10149 | : sat_fract_type_node; | |
14e882ea | 10150 | } |
9421ebb9 | 10151 | else |
10152 | { | |
10153 | if (specs->long_long_p) | |
10154 | specs->type = specs->unsigned_p | |
10155 | ? unsigned_long_long_fract_type_node | |
10156 | : long_long_fract_type_node; | |
10157 | else if (specs->long_p) | |
10158 | specs->type = specs->unsigned_p | |
10159 | ? unsigned_long_fract_type_node | |
10160 | : long_fract_type_node; | |
10161 | else if (specs->short_p) | |
10162 | specs->type = specs->unsigned_p | |
10163 | ? unsigned_short_fract_type_node | |
10164 | : short_fract_type_node; | |
10165 | else | |
10166 | specs->type = specs->unsigned_p | |
10167 | ? unsigned_fract_type_node | |
10168 | : fract_type_node; | |
14e882ea | 10169 | } |
9421ebb9 | 10170 | break; |
10171 | case cts_accum: | |
14e882ea | 10172 | gcc_assert (!specs->complex_p); |
10173 | if (!targetm.fixed_point_supported_p ()) | |
10174 | specs->type = integer_type_node; | |
10175 | else if (specs->saturating_p) | |
9421ebb9 | 10176 | { |
10177 | if (specs->long_long_p) | |
10178 | specs->type = specs->unsigned_p | |
10179 | ? sat_unsigned_long_long_accum_type_node | |
10180 | : sat_long_long_accum_type_node; | |
10181 | else if (specs->long_p) | |
10182 | specs->type = specs->unsigned_p | |
10183 | ? sat_unsigned_long_accum_type_node | |
10184 | : sat_long_accum_type_node; | |
10185 | else if (specs->short_p) | |
10186 | specs->type = specs->unsigned_p | |
10187 | ? sat_unsigned_short_accum_type_node | |
10188 | : sat_short_accum_type_node; | |
10189 | else | |
10190 | specs->type = specs->unsigned_p | |
10191 | ? sat_unsigned_accum_type_node | |
10192 | : sat_accum_type_node; | |
14e882ea | 10193 | } |
9421ebb9 | 10194 | else |
10195 | { | |
10196 | if (specs->long_long_p) | |
10197 | specs->type = specs->unsigned_p | |
10198 | ? unsigned_long_long_accum_type_node | |
10199 | : long_long_accum_type_node; | |
10200 | else if (specs->long_p) | |
10201 | specs->type = specs->unsigned_p | |
10202 | ? unsigned_long_accum_type_node | |
10203 | : long_accum_type_node; | |
10204 | else if (specs->short_p) | |
10205 | specs->type = specs->unsigned_p | |
10206 | ? unsigned_short_accum_type_node | |
10207 | : short_accum_type_node; | |
10208 | else | |
10209 | specs->type = specs->unsigned_p | |
10210 | ? unsigned_accum_type_node | |
10211 | : accum_type_node; | |
14e882ea | 10212 | } |
9421ebb9 | 10213 | break; |
70dd11f7 | 10214 | default: |
10215 | gcc_unreachable (); | |
10216 | } | |
10217 | ||
10218 | return specs; | |
10219 | } | |
10220 | ||
c131e678 | 10221 | /* A subroutine of c_write_global_declarations. Perform final processing |
10222 | on one file scope's declarations (or the external scope's declarations), | |
10223 | GLOBALS. */ | |
10224 | ||
393b349a | 10225 | static void |
10226 | c_write_global_declarations_1 (tree globals) | |
40109983 | 10227 | { |
40109983 | 10228 | tree decl; |
aac7998f | 10229 | bool reconsider; |
14338e9a | 10230 | |
393b349a | 10231 | /* Process the decls in the order they were written. */ |
1767a056 | 10232 | for (decl = globals; decl; decl = DECL_CHAIN (decl)) |
9823d3a9 | 10233 | { |
9823d3a9 | 10234 | /* Check for used but undefined static functions using the C |
10235 | standard's definition of "used", and set TREE_NO_WARNING so | |
10236 | that check_global_declarations doesn't repeat the check. */ | |
10237 | if (TREE_CODE (decl) == FUNCTION_DECL | |
10238 | && DECL_INITIAL (decl) == 0 | |
10239 | && DECL_EXTERNAL (decl) | |
10240 | && !TREE_PUBLIC (decl) | |
10241 | && C_DECL_USED (decl)) | |
10242 | { | |
21ca8540 | 10243 | pedwarn (input_location, 0, "%q+F used but never defined", decl); |
9823d3a9 | 10244 | TREE_NO_WARNING (decl) = 1; |
10245 | } | |
c131e678 | 10246 | |
10247 | wrapup_global_declaration_1 (decl); | |
9823d3a9 | 10248 | } |
aac7998f | 10249 | |
10250 | do | |
10251 | { | |
10252 | reconsider = false; | |
1767a056 | 10253 | for (decl = globals; decl; decl = DECL_CHAIN (decl)) |
aac7998f | 10254 | reconsider |= wrapup_global_declaration_2 (decl); |
10255 | } | |
10256 | while (reconsider); | |
10257 | ||
1767a056 | 10258 | for (decl = globals; decl; decl = DECL_CHAIN (decl)) |
aac7998f | 10259 | check_global_declaration_1 (decl); |
c131e678 | 10260 | } |
40109983 | 10261 | |
c131e678 | 10262 | /* A subroutine of c_write_global_declarations Emit debug information for each |
10263 | of the declarations in GLOBALS. */ | |
14338e9a | 10264 | |
c131e678 | 10265 | static void |
10266 | c_write_global_declarations_2 (tree globals) | |
10267 | { | |
10268 | tree decl; | |
10269 | ||
1767a056 | 10270 | for (decl = globals; decl ; decl = DECL_CHAIN (decl)) |
c131e678 | 10271 | debug_hooks->global_decl (decl); |
40109983 | 10272 | } |
10273 | ||
f608fcb7 | 10274 | /* Callback to collect a source_ref from a DECL. */ |
10275 | ||
10276 | static void | |
10277 | collect_source_ref_cb (tree decl) | |
10278 | { | |
10279 | if (!DECL_IS_BUILTIN (decl)) | |
10280 | collect_source_ref (LOCATION_FILE (decl_sloc (decl, false))); | |
10281 | } | |
10282 | ||
00ce46e2 | 10283 | /* Preserve the external declarations scope across a garbage collect. */ |
10284 | static GTY(()) tree ext_block; | |
10285 | ||
f608fcb7 | 10286 | /* Collect all references relevant to SOURCE_FILE. */ |
10287 | ||
10288 | static void | |
10289 | collect_all_refs (const char *source_file) | |
10290 | { | |
10291 | tree t; | |
23bdc9ca | 10292 | unsigned i; |
f608fcb7 | 10293 | |
f1f41a6c | 10294 | FOR_EACH_VEC_ELT (*all_translation_units, i, t) |
f608fcb7 | 10295 | collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t)), source_file); |
00ce46e2 | 10296 | |
10297 | collect_ada_nodes (BLOCK_VARS (ext_block), source_file); | |
f608fcb7 | 10298 | } |
10299 | ||
10300 | /* Iterate over all global declarations and call CALLBACK. */ | |
10301 | ||
10302 | static void | |
10303 | for_each_global_decl (void (*callback) (tree decl)) | |
10304 | { | |
10305 | tree t; | |
10306 | tree decls; | |
10307 | tree decl; | |
23bdc9ca | 10308 | unsigned i; |
f608fcb7 | 10309 | |
f1f41a6c | 10310 | FOR_EACH_VEC_ELT (*all_translation_units, i, t) |
f608fcb7 | 10311 | { |
10312 | decls = DECL_INITIAL (t); | |
10313 | for (decl = BLOCK_VARS (decls); decl; decl = TREE_CHAIN (decl)) | |
10314 | callback (decl); | |
10315 | } | |
f608fcb7 | 10316 | |
00ce46e2 | 10317 | for (decl = BLOCK_VARS (ext_block); decl; decl = TREE_CHAIN (decl)) |
10318 | callback (decl); | |
10319 | } | |
c131e678 | 10320 | |
40109983 | 10321 | void |
393b349a | 10322 | c_write_global_declarations (void) |
40109983 | 10323 | { |
c131e678 | 10324 | tree t; |
23bdc9ca | 10325 | unsigned i; |
d9cf68bf | 10326 | |
393b349a | 10327 | /* We don't want to do this if generating a PCH. */ |
10328 | if (pch_file) | |
10329 | return; | |
40109983 | 10330 | |
6198e8f6 | 10331 | timevar_start (TV_PHASE_DEFERRED); |
10332 | ||
64cd9619 | 10333 | /* Do the Objective-C stuff. This is where all the Objective-C |
10334 | module stuff gets generated (symtab, class/protocol/selector | |
10335 | lists etc). */ | |
10336 | if (c_dialect_objc ()) | |
10337 | objc_write_global_declarations (); | |
10338 | ||
aea7e1dc | 10339 | /* Close the external scope. */ |
10340 | ext_block = pop_scope (); | |
10341 | external_scope = 0; | |
231bd014 | 10342 | gcc_assert (!current_scope); |
aea7e1dc | 10343 | |
f608fcb7 | 10344 | /* Handle -fdump-ada-spec[-slim]. */ |
ef34afc1 | 10345 | if (flag_dump_ada_spec || flag_dump_ada_spec_slim) |
f608fcb7 | 10346 | { |
10347 | /* Build a table of files to generate specs for */ | |
ef34afc1 | 10348 | if (flag_dump_ada_spec_slim) |
f608fcb7 | 10349 | collect_source_ref (main_input_filename); |
10350 | else | |
10351 | for_each_global_decl (collect_source_ref_cb); | |
10352 | ||
10353 | dump_ada_specs (collect_all_refs, NULL); | |
10354 | } | |
10355 | ||
9021d2da | 10356 | if (ext_block) |
10357 | { | |
10358 | tree tmp = BLOCK_VARS (ext_block); | |
10359 | int flags; | |
10360 | FILE * stream = dump_begin (TDI_tu, &flags); | |
10361 | if (stream && tmp) | |
a0c938f0 | 10362 | { |
10363 | dump_node (tmp, flags & ~TDF_SLIM, stream); | |
10364 | dump_end (TDI_tu, stream); | |
10365 | } | |
9021d2da | 10366 | } |
c131e678 | 10367 | |
10368 | /* Process all file scopes in this compilation, and the external_scope, | |
10369 | through wrapup_global_declarations and check_global_declarations. */ | |
f1f41a6c | 10370 | FOR_EACH_VEC_ELT (*all_translation_units, i, t) |
c131e678 | 10371 | c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t))); |
aea7e1dc | 10372 | c_write_global_declarations_1 (BLOCK_VARS (ext_block)); |
10373 | ||
6198e8f6 | 10374 | timevar_stop (TV_PHASE_DEFERRED); |
161121a9 | 10375 | timevar_start (TV_PHASE_OPT_GEN); |
6198e8f6 | 10376 | |
aea7e1dc | 10377 | /* We're done parsing; proceed to optimize and emit assembly. |
10378 | FIXME: shouldn't be the front end's responsibility to call this. */ | |
cf951b1a | 10379 | finalize_compilation_unit (); |
c131e678 | 10380 | |
161121a9 | 10381 | timevar_stop (TV_PHASE_OPT_GEN); |
6198e8f6 | 10382 | timevar_start (TV_PHASE_DBGINFO); |
10383 | ||
c131e678 | 10384 | /* After cgraph has had a chance to emit everything that's going to |
10385 | be emitted, output debug information for globals. */ | |
852f689e | 10386 | if (!seen_error ()) |
c131e678 | 10387 | { |
10388 | timevar_push (TV_SYMOUT); | |
f1f41a6c | 10389 | FOR_EACH_VEC_ELT (*all_translation_units, i, t) |
c131e678 | 10390 | c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t))); |
10391 | c_write_global_declarations_2 (BLOCK_VARS (ext_block)); | |
10392 | timevar_pop (TV_SYMOUT); | |
10393 | } | |
10394 | ||
10395 | ext_block = NULL; | |
6198e8f6 | 10396 | timevar_stop (TV_PHASE_DBGINFO); |
40109983 | 10397 | } |
10398 | ||
6ad8abad | 10399 | /* Register reserved keyword WORD as qualifier for address space AS. */ |
10400 | ||
10401 | void | |
10402 | c_register_addr_space (const char *word, addr_space_t as) | |
10403 | { | |
10404 | int rid = RID_FIRST_ADDR_SPACE + as; | |
10405 | tree id; | |
10406 | ||
10407 | /* Address space qualifiers are only supported | |
10408 | in C with GNU extensions enabled. */ | |
10409 | if (c_dialect_objc () || flag_no_asm) | |
10410 | return; | |
10411 | ||
10412 | id = get_identifier (word); | |
10413 | C_SET_RID_CODE (id, rid); | |
10414 | C_IS_RESERVED_WORD (id) = 1; | |
10415 | ridpointers [rid] = id; | |
10416 | } | |
10417 | ||
bc7bff74 | 10418 | /* Return identifier to look up for omp declare reduction. */ |
10419 | ||
10420 | tree | |
10421 | c_omp_reduction_id (enum tree_code reduction_code, tree reduction_id) | |
10422 | { | |
10423 | const char *p = NULL; | |
10424 | switch (reduction_code) | |
10425 | { | |
10426 | case PLUS_EXPR: p = "+"; break; | |
10427 | case MULT_EXPR: p = "*"; break; | |
10428 | case MINUS_EXPR: p = "-"; break; | |
10429 | case BIT_AND_EXPR: p = "&"; break; | |
10430 | case BIT_XOR_EXPR: p = "^"; break; | |
10431 | case BIT_IOR_EXPR: p = "|"; break; | |
10432 | case TRUTH_ANDIF_EXPR: p = "&&"; break; | |
10433 | case TRUTH_ORIF_EXPR: p = "||"; break; | |
10434 | case MIN_EXPR: p = "min"; break; | |
10435 | case MAX_EXPR: p = "max"; break; | |
10436 | default: | |
10437 | break; | |
10438 | } | |
10439 | ||
10440 | if (p == NULL) | |
10441 | { | |
10442 | if (TREE_CODE (reduction_id) != IDENTIFIER_NODE) | |
10443 | return error_mark_node; | |
10444 | p = IDENTIFIER_POINTER (reduction_id); | |
10445 | } | |
10446 | ||
10447 | const char prefix[] = "omp declare reduction "; | |
10448 | size_t lenp = sizeof (prefix); | |
10449 | size_t len = strlen (p); | |
10450 | char *name = XALLOCAVEC (char, lenp + len); | |
10451 | memcpy (name, prefix, lenp - 1); | |
10452 | memcpy (name + lenp - 1, p, len + 1); | |
10453 | return get_identifier (name); | |
10454 | } | |
10455 | ||
10456 | /* Lookup REDUCTION_ID in the current scope, or create an artificial | |
10457 | VAR_DECL, bind it into the current scope and return it. */ | |
10458 | ||
10459 | tree | |
10460 | c_omp_reduction_decl (tree reduction_id) | |
10461 | { | |
10462 | struct c_binding *b = I_SYMBOL_BINDING (reduction_id); | |
10463 | if (b != NULL && B_IN_CURRENT_SCOPE (b)) | |
10464 | return b->decl; | |
10465 | ||
10466 | tree decl = build_decl (BUILTINS_LOCATION, VAR_DECL, | |
10467 | reduction_id, integer_type_node); | |
10468 | DECL_ARTIFICIAL (decl) = 1; | |
10469 | DECL_EXTERNAL (decl) = 1; | |
10470 | TREE_STATIC (decl) = 1; | |
10471 | TREE_PUBLIC (decl) = 0; | |
10472 | bind (reduction_id, decl, current_scope, true, false, BUILTINS_LOCATION); | |
10473 | return decl; | |
10474 | } | |
10475 | ||
10476 | /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */ | |
10477 | ||
10478 | tree | |
10479 | c_omp_reduction_lookup (tree reduction_id, tree type) | |
10480 | { | |
10481 | struct c_binding *b = I_SYMBOL_BINDING (reduction_id); | |
10482 | while (b) | |
10483 | { | |
10484 | tree t; | |
10485 | for (t = DECL_INITIAL (b->decl); t; t = TREE_CHAIN (t)) | |
10486 | if (comptypes (TREE_PURPOSE (t), type)) | |
10487 | return TREE_VALUE (t); | |
10488 | b = b->shadowed; | |
10489 | } | |
10490 | return error_mark_node; | |
10491 | } | |
10492 | ||
10493 | /* Helper function called via walk_tree, to diagnose invalid | |
10494 | #pragma omp declare reduction combiners or initializers. */ | |
10495 | ||
10496 | tree | |
10497 | c_check_omp_declare_reduction_r (tree *tp, int *, void *data) | |
10498 | { | |
10499 | tree *vars = (tree *) data; | |
10500 | if (SSA_VAR_P (*tp) | |
10501 | && !DECL_ARTIFICIAL (*tp) | |
10502 | && *tp != vars[0] | |
10503 | && *tp != vars[1]) | |
10504 | { | |
10505 | location_t loc = DECL_SOURCE_LOCATION (vars[0]); | |
10506 | if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars[0])), "omp_out") == 0) | |
10507 | error_at (loc, "%<#pragma omp declare reduction%> combiner refers to " | |
10508 | "variable %qD which is not %<omp_out%> nor %<omp_in%>", | |
10509 | *tp); | |
10510 | else | |
10511 | error_at (loc, "%<#pragma omp declare reduction%> initializer refers " | |
10512 | "to variable %qD which is not %<omp_priv%> nor " | |
10513 | "%<omp_orig%>", | |
10514 | *tp); | |
10515 | return *tp; | |
10516 | } | |
10517 | return NULL_TREE; | |
10518 | } | |
10519 | ||
e53d55e7 | 10520 | #include "gt-c-c-decl.h" |