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51ef3909 | 1 | /* Process declarations and variables for C compiler. |
5e6015b1 | 2 | Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
cfaf579d | 3 | 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
68d6de5b | 4 | Free Software Foundation, Inc. |
51ef3909 | 5 | |
f12b58b3 | 6 | This file is part of GCC. |
51ef3909 | 7 | |
f12b58b3 | 8 | GCC is free software; you can redistribute it and/or modify it under |
9 | the terms of the GNU General Public License as published by the Free | |
8c4c00c1 | 10 | Software Foundation; either version 3, or (at your option) any later |
f12b58b3 | 11 | version. |
51ef3909 | 12 | |
f12b58b3 | 13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
51ef3909 | 17 | |
18 | You should have received a copy of the GNU General Public License | |
8c4c00c1 | 19 | along with GCC; see the file COPYING3. If not see |
20 | <http://www.gnu.org/licenses/>. */ | |
51ef3909 | 21 | |
51ef3909 | 22 | /* Process declarations and symbol lookup for C front end. |
23 | Also constructs types; the standard scalar types at initialization, | |
24 | and structure, union, array and enum types when they are declared. */ | |
25 | ||
26 | /* ??? not all decl nodes are given the most useful possible | |
27 | line numbers. For example, the CONST_DECLs for enum values. */ | |
28 | ||
29 | #include "config.h" | |
405711de | 30 | #include "system.h" |
805e22b2 | 31 | #include "coretypes.h" |
ba821eb1 | 32 | #include "input.h" |
805e22b2 | 33 | #include "tm.h" |
6e6e5faa | 34 | #include "intl.h" |
51ef3909 | 35 | #include "tree.h" |
e619d7b1 | 36 | #include "tree-inline.h" |
d2c88713 | 37 | #include "rtl.h" |
51ef3909 | 38 | #include "flags.h" |
0a893c29 | 39 | #include "function.h" |
1ff68c01 | 40 | #include "output.h" |
d2c88713 | 41 | #include "expr.h" |
51ef3909 | 42 | #include "c-tree.h" |
9cdfa0b0 | 43 | #include "toplev.h" |
dc12af01 | 44 | #include "ggc.h" |
61788791 | 45 | #include "tm_p.h" |
11ce684d | 46 | #include "cpplib.h" |
a767736d | 47 | #include "target.h" |
b29760a8 | 48 | #include "debug.h" |
dcfa26d9 | 49 | #include "opts.h" |
9645fa4f | 50 | #include "timevar.h" |
5f3cead1 | 51 | #include "c-common.h" |
5626f4cd | 52 | #include "c-pragma.h" |
4ee9c684 | 53 | #include "langhooks.h" |
54 | #include "tree-mudflap.h" | |
75a70cf9 | 55 | #include "gimple.h" |
56 | #include "tree-iterator.h" | |
4ee9c684 | 57 | #include "diagnostic.h" |
58 | #include "tree-dump.h" | |
ae01b312 | 59 | #include "cgraph.h" |
4d2aa485 | 60 | #include "hashtab.h" |
7acb29a3 | 61 | #include "libfuncs.h" |
62 | #include "except.h" | |
43085570 | 63 | #include "langhooks-def.h" |
5ded8c6f | 64 | #include "pointer-set.h" |
75a70cf9 | 65 | #include "gimple.h" |
9227b6fc | 66 | #include "plugin.h" |
11ce684d | 67 | |
51ef3909 | 68 | /* In grokdeclarator, distinguish syntactic contexts of declarators. */ |
69 | enum decl_context | |
70 | { NORMAL, /* Ordinary declaration */ | |
71 | FUNCDEF, /* Function definition */ | |
72 | PARM, /* Declaration of parm before function body */ | |
73 | FIELD, /* Declaration inside struct or union */ | |
51ef3909 | 74 | TYPENAME}; /* Typename (inside cast or sizeof) */ |
75 | ||
81f218ec | 76 | /* States indicating how grokdeclarator() should handle declspecs marked |
77 | with __attribute__((deprecated)). An object declared as | |
78 | __attribute__((deprecated)) suppresses warnings of uses of other | |
79 | deprecated items. */ | |
80 | ||
81 | enum deprecated_states { | |
82 | DEPRECATED_NORMAL, | |
83 | DEPRECATED_SUPPRESS | |
84 | }; | |
85 | ||
51ef3909 | 86 | \f |
51ef3909 | 87 | /* Nonzero if we have seen an invalid cross reference |
88 | to a struct, union, or enum, but not yet printed the message. */ | |
51ef3909 | 89 | tree pending_invalid_xref; |
e24e8df7 | 90 | |
51ef3909 | 91 | /* File and line to appear in the eventual error message. */ |
bca5a169 | 92 | location_t pending_invalid_xref_location; |
51ef3909 | 93 | |
e24e8df7 | 94 | /* True means we've initialized exception handling. */ |
95 | bool c_eh_initialized_p; | |
96 | ||
a89ce285 | 97 | /* The file and line that the prototype came from if this is an |
98 | old-style definition; used for diagnostics in | |
99 | store_parm_decls_oldstyle. */ | |
2b652cf3 | 100 | |
46f9c5ec | 101 | static location_t current_function_prototype_locus; |
06460bd1 | 102 | |
3eafcdb5 | 103 | /* Whether this prototype was built-in. */ |
104 | ||
105 | static bool current_function_prototype_built_in; | |
106 | ||
107 | /* The argument type information of this prototype. */ | |
108 | ||
109 | static tree current_function_prototype_arg_types; | |
110 | ||
731e6cbf | 111 | /* The argument information structure for the function currently being |
112 | defined. */ | |
113 | ||
ac206aff | 114 | static struct c_arg_info *current_function_arg_info; |
731e6cbf | 115 | |
9823d3a9 | 116 | /* The obstack on which parser and related data structures, which are |
117 | not live beyond their top-level declaration or definition, are | |
118 | allocated. */ | |
119 | struct obstack parser_obstack; | |
120 | ||
e41f0d80 | 121 | /* The current statement tree. */ |
122 | ||
1f3233d1 | 123 | static GTY(()) struct stmt_tree_s c_stmt_tree; |
e41f0d80 | 124 | |
8b332087 | 125 | /* State saving variables. */ |
0375a275 | 126 | tree c_break_label; |
127 | tree c_cont_label; | |
d9cf68bf | 128 | |
4d714d55 | 129 | /* Linked list of TRANSLATION_UNIT_DECLS for the translation units |
130 | included in this invocation. Note that the current translation | |
131 | unit is not included in this list. */ | |
40109983 | 132 | |
4d714d55 | 133 | static GTY(()) tree all_translation_units; |
40109983 | 134 | |
393b349a | 135 | /* A list of decls to be made automatically visible in each file scope. */ |
136 | static GTY(()) tree visible_builtins; | |
137 | ||
51ef3909 | 138 | /* Set to 0 at beginning of a function definition, set to 1 if |
139 | a return statement that specifies a return value is seen. */ | |
140 | ||
141 | int current_function_returns_value; | |
142 | ||
143 | /* Set to 0 at beginning of a function definition, set to 1 if | |
144 | a return statement with no argument is seen. */ | |
145 | ||
146 | int current_function_returns_null; | |
147 | ||
af857942 | 148 | /* Set to 0 at beginning of a function definition, set to 1 if |
149 | a call to a noreturn function is seen. */ | |
150 | ||
151 | int current_function_returns_abnormally; | |
152 | ||
51ef3909 | 153 | /* Set to nonzero by `grokdeclarator' for a function |
154 | whose return type is defaulted, if warnings for this are desired. */ | |
155 | ||
156 | static int warn_about_return_type; | |
157 | ||
8a1f0315 | 158 | /* Nonzero when the current toplevel function contains a declaration |
159 | of a nested function which is never defined. */ | |
160 | ||
161 | static bool undef_nested_function; | |
162 | ||
393b349a | 163 | /* True means global_bindings_p should return false even if the scope stack |
164 | says we are in file scope. */ | |
165 | bool c_override_global_bindings_to_false; | |
166 | ||
51ef3909 | 167 | \f |
393b349a | 168 | /* Each c_binding structure describes one binding of an identifier to |
169 | a decl. All the decls in a scope - irrespective of namespace - are | |
170 | chained together by the ->prev field, which (as the name implies) | |
171 | runs in reverse order. All the decls in a given namespace bound to | |
172 | a given identifier are chained by the ->shadowed field, which runs | |
4194491a | 173 | from inner to outer scopes. |
393b349a | 174 | |
175 | The ->decl field usually points to a DECL node, but there are two | |
176 | exceptions. In the namespace of type tags, the bound entity is a | |
177 | RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared | |
178 | identifier is encountered, it is bound to error_mark_node to | |
179 | suppress further errors about that identifier in the current | |
4194491a | 180 | function. |
181 | ||
f805d53d | 182 | The ->u.type field stores the type of the declaration in this scope; |
606a02e3 | 183 | if NULL, the type is the type of the ->decl field. This is only of |
184 | relevance for objects with external or internal linkage which may | |
185 | be redeclared in inner scopes, forming composite types that only | |
186 | persist for the duration of those scopes. In the external scope, | |
187 | this stores the composite of all the types declared for this | |
188 | object, visible or not. The ->inner_comp field (used only at file | |
189 | scope) stores whether an incomplete array type at file scope was | |
190 | completed at an inner scope to an array size other than 1. | |
191 | ||
f805d53d | 192 | The ->u.label field is used for labels. It points to a structure |
193 | which stores additional information used for warnings. | |
194 | ||
4194491a | 195 | The depth field is copied from the scope structure that holds this |
196 | decl. It is used to preserve the proper ordering of the ->shadowed | |
197 | field (see bind()) and also for a handful of special-case checks. | |
198 | Finally, the invisible bit is true for a decl which should be | |
199 | ignored for purposes of normal name lookup, and the nested bit is | |
200 | true for a decl that's been bound a second time in an inner scope; | |
201 | in all such cases, the binding in the outer scope will have its | |
202 | invisible bit true. */ | |
393b349a | 203 | |
fb1e4f4a | 204 | struct GTY((chain_next ("%h.prev"))) c_binding { |
f805d53d | 205 | union GTY(()) { /* first so GTY desc can use decl */ |
206 | tree GTY((tag ("0"))) type; /* the type in this scope */ | |
207 | struct c_label_vars * GTY((tag ("1"))) label; /* for warnings */ | |
208 | } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u; | |
393b349a | 209 | tree decl; /* the decl bound */ |
210 | tree id; /* the identifier it's bound to */ | |
211 | struct c_binding *prev; /* the previous decl in this scope */ | |
212 | struct c_binding *shadowed; /* the innermost decl shadowed by this one */ | |
4194491a | 213 | unsigned int depth : 28; /* depth of this scope */ |
214 | BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */ | |
215 | BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */ | |
606a02e3 | 216 | BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */ |
843bd2fa | 217 | BOOL_BITFIELD in_struct : 1; /* currently defined as struct field */ |
6fb80942 | 218 | location_t locus; /* location for nested bindings */ |
393b349a | 219 | }; |
4194491a | 220 | #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth) |
221 | #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth) | |
222 | #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/) | |
223 | #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/) | |
393b349a | 224 | |
225 | #define I_SYMBOL_BINDING(node) \ | |
84166705 | 226 | (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding) |
393b349a | 227 | #define I_SYMBOL_DECL(node) \ |
228 | (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0) | |
229 | ||
230 | #define I_TAG_BINDING(node) \ | |
84166705 | 231 | (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding) |
393b349a | 232 | #define I_TAG_DECL(node) \ |
233 | (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0) | |
234 | ||
235 | #define I_LABEL_BINDING(node) \ | |
84166705 | 236 | (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding) |
393b349a | 237 | #define I_LABEL_DECL(node) \ |
238 | (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0) | |
239 | ||
56533c31 | 240 | /* Each C symbol points to three linked lists of c_binding structures. |
241 | These describe the values of the identifier in the three different | |
242 | namespaces defined by the language. */ | |
243 | ||
fb1e4f4a | 244 | struct GTY(()) lang_identifier { |
56533c31 | 245 | struct c_common_identifier common_id; |
246 | struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */ | |
247 | struct c_binding *tag_binding; /* struct/union/enum tags */ | |
248 | struct c_binding *label_binding; /* labels */ | |
249 | }; | |
250 | ||
251 | /* Validate c-lang.c's assumptions. */ | |
252 | extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate | |
253 | [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1]; | |
254 | ||
255 | /* The resulting tree type. */ | |
256 | ||
fb1e4f4a | 257 | union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"), |
258 | chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : ((union lang_tree_node *) TREE_CHAIN (&%h.generic))"))) lang_tree_node | |
259 | { | |
56533c31 | 260 | union tree_node GTY ((tag ("0"), |
261 | desc ("tree_node_structure (&%h)"))) | |
262 | generic; | |
263 | struct lang_identifier GTY ((tag ("1"))) identifier; | |
264 | }; | |
265 | ||
f805d53d | 266 | /* Track bindings and other things that matter for goto warnings. For |
267 | efficiency, we do not gather all the decls at the point of | |
268 | definition. Instead, we point into the bindings structure. As | |
269 | scopes are popped, we update these structures and gather the decls | |
270 | that matter at that time. */ | |
271 | ||
272 | struct GTY(()) c_spot_bindings { | |
273 | /* The currently open scope which holds bindings defined when the | |
274 | label was defined or the goto statement was found. */ | |
275 | struct c_scope *scope; | |
276 | /* The bindings in the scope field which were defined at the point | |
277 | of the label or goto. This lets us look at older or newer | |
278 | bindings in the scope, as appropriate. */ | |
279 | struct c_binding *bindings_in_scope; | |
280 | /* The number of statement expressions that have started since this | |
281 | label or goto statement was defined. This is zero if we are at | |
282 | the same statement expression level. It is positive if we are in | |
283 | a statement expression started since this spot. It is negative | |
284 | if this spot was in a statement expression and we have left | |
285 | it. */ | |
286 | int stmt_exprs; | |
287 | /* Whether we started in a statement expression but are no longer in | |
288 | it. This is set to true if stmt_exprs ever goes negative. */ | |
289 | bool left_stmt_expr; | |
290 | }; | |
291 | ||
292 | /* This structure is used to keep track of bindings seen when a goto | |
293 | statement is defined. This is only used if we see the goto | |
294 | statement before we see the label. */ | |
295 | ||
296 | struct GTY(()) c_goto_bindings { | |
297 | /* The location of the goto statement. */ | |
298 | location_t loc; | |
299 | /* The bindings of the goto statement. */ | |
300 | struct c_spot_bindings goto_bindings; | |
301 | }; | |
302 | ||
303 | typedef struct c_goto_bindings *c_goto_bindings_p; | |
304 | DEF_VEC_P(c_goto_bindings_p); | |
305 | DEF_VEC_ALLOC_P(c_goto_bindings_p,gc); | |
306 | ||
307 | /* The additional information we keep track of for a label binding. | |
308 | These fields are updated as scopes are popped. */ | |
309 | ||
310 | struct GTY(()) c_label_vars { | |
311 | /* The shadowed c_label_vars, when one label shadows another (which | |
312 | can only happen using a __label__ declaration). */ | |
313 | struct c_label_vars *shadowed; | |
314 | /* The bindings when the label was defined. */ | |
315 | struct c_spot_bindings label_bindings; | |
316 | /* A list of decls that we care about: decls about which we should | |
317 | warn if a goto branches to this label from later in the function. | |
318 | Decls are added to this list as scopes are popped. We only add | |
319 | the decls that matter. */ | |
320 | VEC(tree,gc) *decls_in_scope; | |
321 | /* A list of goto statements to this label. This is only used for | |
322 | goto statements seen before the label was defined, so that we can | |
323 | issue appropriate warnings for them. */ | |
324 | VEC(c_goto_bindings_p,gc) *gotos; | |
325 | }; | |
326 | ||
393b349a | 327 | /* Each c_scope structure describes the complete contents of one |
328 | scope. Four scopes are distinguished specially: the innermost or | |
329 | current scope, the innermost function scope, the file scope (always | |
330 | the second to outermost) and the outermost or external scope. | |
3bdb6310 | 331 | |
332 | Most declarations are recorded in the current scope. | |
333 | ||
334 | All normal label declarations are recorded in the innermost | |
335 | function scope, as are bindings of undeclared identifiers to | |
336 | error_mark_node. (GCC permits nested functions as an extension, | |
337 | hence the 'innermost' qualifier.) Explicitly declared labels | |
338 | (using the __label__ extension) appear in the current scope. | |
339 | ||
393b349a | 340 | Being in the file scope (current_scope == file_scope) causes |
3bdb6310 | 341 | special behavior in several places below. Also, under some |
342 | conditions the Objective-C front end records declarations in the | |
393b349a | 343 | file scope even though that isn't the current scope. |
344 | ||
345 | All declarations with external linkage are recorded in the external | |
346 | scope, even if they aren't visible there; this models the fact that | |
347 | such declarations are visible to the entire program, and (with a | |
348 | bit of cleverness, see pushdecl) allows diagnosis of some violations | |
349 | of C99 6.2.2p7 and 6.2.7p2: | |
350 | ||
351 | If, within the same translation unit, the same identifier appears | |
352 | with both internal and external linkage, the behavior is | |
353 | undefined. | |
3bdb6310 | 354 | |
393b349a | 355 | All declarations that refer to the same object or function shall |
356 | have compatible type; otherwise, the behavior is undefined. | |
357 | ||
358 | Initially only the built-in declarations, which describe compiler | |
359 | intrinsic functions plus a subset of the standard library, are in | |
360 | this scope. | |
361 | ||
362 | The order of the blocks list matters, and it is frequently appended | |
363 | to. To avoid having to walk all the way to the end of the list on | |
364 | each insertion, or reverse the list later, we maintain a pointer to | |
365 | the last list entry. (FIXME: It should be feasible to use a reversed | |
366 | list here.) | |
367 | ||
368 | The bindings list is strictly in reverse order of declarations; | |
369 | pop_scope relies on this. */ | |
3bdb6310 | 370 | |
51ef3909 | 371 | |
fb1e4f4a | 372 | struct GTY((chain_next ("%h.outer"))) c_scope { |
b3924a2c | 373 | /* The scope containing this one. */ |
374 | struct c_scope *outer; | |
375 | ||
376 | /* The next outermost function scope. */ | |
377 | struct c_scope *outer_function; | |
378 | ||
393b349a | 379 | /* All bindings in this scope. */ |
380 | struct c_binding *bindings; | |
b3924a2c | 381 | |
382 | /* For each scope (except the global one), a chain of BLOCK nodes | |
383 | for all the scopes that were entered and exited one level down. */ | |
384 | tree blocks; | |
3bdb6310 | 385 | tree blocks_last; |
b3924a2c | 386 | |
393b349a | 387 | /* The depth of this scope. Used to keep the ->shadowed chain of |
388 | bindings sorted innermost to outermost. */ | |
389 | unsigned int depth : 28; | |
390 | ||
b3924a2c | 391 | /* True if we are currently filling this scope with parameter |
392 | declarations. */ | |
2ccf1c3a | 393 | BOOL_BITFIELD parm_flag : 1; |
b3924a2c | 394 | |
32d33ab2 | 395 | /* True if we saw [*] in this scope. Used to give an error messages |
396 | if these appears in a function definition. */ | |
397 | BOOL_BITFIELD had_vla_unspec : 1; | |
398 | ||
f74be9a1 | 399 | /* True if we already complained about forward parameter decls |
400 | in this scope. This prevents double warnings on | |
401 | foo (int a; int b; ...) */ | |
2ccf1c3a | 402 | BOOL_BITFIELD warned_forward_parm_decls : 1; |
f74be9a1 | 403 | |
b3924a2c | 404 | /* True if this is the outermost block scope of a function body. |
405 | This scope contains the parameters, the local variables declared | |
406 | in the outermost block, and all the labels (except those in | |
407 | nested functions, or declared at block scope with __label__). */ | |
2ccf1c3a | 408 | BOOL_BITFIELD function_body : 1; |
b3924a2c | 409 | |
410 | /* True means make a BLOCK for this scope no matter what. */ | |
2ccf1c3a | 411 | BOOL_BITFIELD keep : 1; |
3ae3a17f | 412 | |
413 | /* True means that an unsuffixed float constant is _Decimal64. */ | |
414 | BOOL_BITFIELD float_const_decimal64 : 1; | |
f805d53d | 415 | |
416 | /* True if this scope has any label bindings. This is used to speed | |
417 | up searching for labels when popping scopes, particularly since | |
418 | labels are normally only found at function scope. */ | |
419 | BOOL_BITFIELD has_label_bindings : 1; | |
b3924a2c | 420 | }; |
51ef3909 | 421 | |
6e899616 | 422 | /* The scope currently in effect. */ |
4214af46 | 423 | |
6e899616 | 424 | static GTY(()) struct c_scope *current_scope; |
51ef3909 | 425 | |
bdc33d98 | 426 | /* The innermost function scope. Ordinary (not explicitly declared) |
427 | labels, bindings to error_mark_node, and the lazily-created | |
428 | bindings of __func__ and its friends get this scope. */ | |
b3924a2c | 429 | |
6e899616 | 430 | static GTY(()) struct c_scope *current_function_scope; |
bdc33d98 | 431 | |
393b349a | 432 | /* The C file scope. This is reset for each input translation unit. */ |
433 | ||
434 | static GTY(()) struct c_scope *file_scope; | |
435 | ||
436 | /* The outermost scope. This is used for all declarations with | |
437 | external linkage, and only these, hence the name. */ | |
438 | ||
439 | static GTY(()) struct c_scope *external_scope; | |
440 | ||
441 | /* A chain of c_scope structures awaiting reuse. */ | |
442 | ||
7035b2ab | 443 | static GTY((deletable)) struct c_scope *scope_freelist; |
393b349a | 444 | |
445 | /* A chain of c_binding structures awaiting reuse. */ | |
51ef3909 | 446 | |
7035b2ab | 447 | static GTY((deletable)) struct c_binding *binding_freelist; |
51ef3909 | 448 | |
206bdab4 | 449 | /* Append VAR to LIST in scope SCOPE. */ |
3bdb6310 | 450 | #define SCOPE_LIST_APPEND(scope, list, decl) do { \ |
451 | struct c_scope *s_ = (scope); \ | |
452 | tree d_ = (decl); \ | |
453 | if (s_->list##_last) \ | |
93110716 | 454 | BLOCK_CHAIN (s_->list##_last) = d_; \ |
3bdb6310 | 455 | else \ |
456 | s_->list = d_; \ | |
457 | s_->list##_last = d_; \ | |
458 | } while (0) | |
459 | ||
460 | /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */ | |
461 | #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \ | |
462 | struct c_scope *t_ = (tscope); \ | |
463 | struct c_scope *f_ = (fscope); \ | |
464 | if (t_->to##_last) \ | |
93110716 | 465 | BLOCK_CHAIN (t_->to##_last) = f_->from; \ |
3bdb6310 | 466 | else \ |
467 | t_->to = f_->from; \ | |
468 | t_->to##_last = f_->from##_last; \ | |
469 | } while (0) | |
470 | ||
551ed71a | 471 | /* A c_inline_static structure stores details of a static identifier |
472 | referenced in a definition of a function that may be an inline | |
473 | definition if no subsequent declaration of that function uses | |
474 | "extern" or does not use "inline". */ | |
475 | ||
476 | struct GTY((chain_next ("%h.next"))) c_inline_static { | |
477 | /* The location for a diagnostic. */ | |
478 | location_t location; | |
479 | ||
480 | /* The function that may be an inline definition. */ | |
481 | tree function; | |
482 | ||
483 | /* The object or function referenced. */ | |
484 | tree static_decl; | |
485 | ||
486 | /* What sort of reference this is. */ | |
487 | enum c_inline_static_type type; | |
488 | ||
489 | /* The next such structure or NULL. */ | |
490 | struct c_inline_static *next; | |
491 | }; | |
492 | ||
493 | /* List of static identifiers used or referenced in functions that may | |
494 | be inline definitions. */ | |
495 | static GTY(()) struct c_inline_static *c_inline_statics; | |
496 | ||
6e899616 | 497 | /* True means unconditionally make a BLOCK for the next scope pushed. */ |
51ef3909 | 498 | |
bdc33d98 | 499 | static bool keep_next_level_flag; |
51ef3909 | 500 | |
393b349a | 501 | /* True means the next call to push_scope will be the outermost scope |
e69f6ec7 | 502 | of a function body, so do not push a new scope, merely cease |
503 | expecting parameter decls. */ | |
4214af46 | 504 | |
e69f6ec7 | 505 | static bool next_is_function_body; |
51ef3909 | 506 | |
843bd2fa | 507 | /* A VEC of pointers to c_binding structures. */ |
508 | ||
509 | typedef struct c_binding *c_binding_ptr; | |
510 | DEF_VEC_P(c_binding_ptr); | |
511 | DEF_VEC_ALLOC_P(c_binding_ptr,heap); | |
512 | ||
513 | /* Information that we keep for a struct or union while it is being | |
514 | parsed. */ | |
515 | ||
516 | struct c_struct_parse_info | |
517 | { | |
518 | /* If warn_cxx_compat, a list of types defined within this | |
519 | struct. */ | |
520 | VEC(tree,heap) *struct_types; | |
521 | /* If warn_cxx_compat, a list of field names which have bindings, | |
522 | and which are defined in this struct, but which are not defined | |
523 | in any enclosing struct. This is used to clear the in_struct | |
524 | field of the c_bindings structure. */ | |
525 | VEC(c_binding_ptr,heap) *fields; | |
526 | /* If warn_cxx_compat, a list of typedef names used when defining | |
527 | fields in this struct. */ | |
528 | VEC(tree,heap) *typedefs_seen; | |
529 | }; | |
530 | ||
531 | /* Information for the struct or union currently being parsed, or | |
532 | NULL if not parsing a struct or union. */ | |
533 | static struct c_struct_parse_info *struct_parse_info; | |
534 | ||
51ef3909 | 535 | /* Forward declarations. */ |
393b349a | 536 | static tree lookup_name_in_scope (tree, struct c_scope *); |
e60a6f7b | 537 | static tree c_make_fname_decl (location_t, tree, int); |
9553111d | 538 | static tree grokdeclarator (const struct c_declarator *, |
539 | struct c_declspecs *, | |
a75b1c71 | 540 | enum decl_context, bool, tree *, tree *, tree *, |
541 | bool *, enum deprecated_states); | |
ac206aff | 542 | static tree grokparms (struct c_arg_info *, bool); |
1cae46be | 543 | static void layout_array_type (tree); |
51ef3909 | 544 | \f |
d1725120 | 545 | /* T is a statement. Add it to the statement-tree. This is the |
546 | C/ObjC version--C++ has a slightly different version of this | |
547 | function. */ | |
548 | ||
549 | tree | |
550 | add_stmt (tree t) | |
551 | { | |
552 | enum tree_code code = TREE_CODE (t); | |
553 | ||
35cc02b5 | 554 | if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR) |
d1725120 | 555 | { |
556 | if (!EXPR_HAS_LOCATION (t)) | |
557 | SET_EXPR_LOCATION (t, input_location); | |
558 | } | |
559 | ||
560 | if (code == LABEL_EXPR || code == CASE_LABEL_EXPR) | |
561 | STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1; | |
562 | ||
563 | /* Add T to the statement-tree. Non-side-effect statements need to be | |
564 | recorded during statement expressions. */ | |
565 | append_to_statement_list_force (t, &cur_stmt_list); | |
566 | ||
567 | return t; | |
568 | } | |
569 | \f | |
88da234d | 570 | |
51ef3909 | 571 | void |
1cae46be | 572 | c_print_identifier (FILE *file, tree node, int indent) |
51ef3909 | 573 | { |
393b349a | 574 | print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4); |
575 | print_node (file, "tag", I_TAG_DECL (node), indent + 4); | |
576 | print_node (file, "label", I_LABEL_DECL (node), indent + 4); | |
5c6e5756 | 577 | if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN) |
518796ad | 578 | { |
579 | tree rid = ridpointers[C_RID_CODE (node)]; | |
580 | indent_to (file, indent + 4); | |
ca0205ee | 581 | fprintf (file, "rid %p \"%s\"", |
6f817829 | 582 | (void *) rid, IDENTIFIER_POINTER (rid)); |
518796ad | 583 | } |
51ef3909 | 584 | } |
393b349a | 585 | |
586 | /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL, | |
587 | which may be any of several kinds of DECL or TYPE or error_mark_node, | |
588 | in the scope SCOPE. */ | |
589 | static void | |
6fb80942 | 590 | bind (tree name, tree decl, struct c_scope *scope, bool invisible, |
591 | bool nested, location_t locus) | |
393b349a | 592 | { |
593 | struct c_binding *b, **here; | |
594 | ||
595 | if (binding_freelist) | |
596 | { | |
597 | b = binding_freelist; | |
598 | binding_freelist = b->prev; | |
599 | } | |
600 | else | |
9318f22c | 601 | b = GGC_NEW (struct c_binding); |
393b349a | 602 | |
603 | b->shadowed = 0; | |
604 | b->decl = decl; | |
605 | b->id = name; | |
4194491a | 606 | b->depth = scope->depth; |
607 | b->invisible = invisible; | |
608 | b->nested = nested; | |
606a02e3 | 609 | b->inner_comp = 0; |
843bd2fa | 610 | b->in_struct = 0; |
6fb80942 | 611 | b->locus = locus; |
606a02e3 | 612 | |
f805d53d | 613 | b->u.type = NULL; |
393b349a | 614 | |
615 | b->prev = scope->bindings; | |
616 | scope->bindings = b; | |
617 | ||
618 | if (!name) | |
619 | return; | |
620 | ||
621 | switch (TREE_CODE (decl)) | |
622 | { | |
623 | case LABEL_DECL: here = &I_LABEL_BINDING (name); break; | |
624 | case ENUMERAL_TYPE: | |
625 | case UNION_TYPE: | |
626 | case RECORD_TYPE: here = &I_TAG_BINDING (name); break; | |
627 | case VAR_DECL: | |
628 | case FUNCTION_DECL: | |
629 | case TYPE_DECL: | |
630 | case CONST_DECL: | |
631 | case PARM_DECL: | |
632 | case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break; | |
633 | ||
634 | default: | |
231bd014 | 635 | gcc_unreachable (); |
393b349a | 636 | } |
637 | ||
638 | /* Locate the appropriate place in the chain of shadowed decls | |
639 | to insert this binding. Normally, scope == current_scope and | |
640 | this does nothing. */ | |
4194491a | 641 | while (*here && (*here)->depth > scope->depth) |
393b349a | 642 | here = &(*here)->shadowed; |
643 | ||
644 | b->shadowed = *here; | |
645 | *here = b; | |
646 | } | |
647 | ||
648 | /* Clear the binding structure B, stick it on the binding_freelist, | |
649 | and return the former value of b->prev. This is used by pop_scope | |
650 | and get_parm_info to iterate destructively over all the bindings | |
651 | from a given scope. */ | |
652 | static struct c_binding * | |
653 | free_binding_and_advance (struct c_binding *b) | |
654 | { | |
655 | struct c_binding *prev = b->prev; | |
656 | ||
4194491a | 657 | memset (b, 0, sizeof (struct c_binding)); |
393b349a | 658 | b->prev = binding_freelist; |
659 | binding_freelist = b; | |
660 | ||
661 | return prev; | |
662 | } | |
663 | ||
f805d53d | 664 | /* Bind a label. Like bind, but skip fields which aren't used for |
665 | labels, and add the LABEL_VARS value. */ | |
666 | static void | |
667 | bind_label (tree name, tree label, struct c_scope *scope, | |
668 | struct c_label_vars *label_vars) | |
669 | { | |
670 | struct c_binding *b; | |
671 | ||
672 | bind (name, label, scope, /*invisible=*/false, /*nested=*/false, | |
673 | UNKNOWN_LOCATION); | |
674 | ||
675 | scope->has_label_bindings = true; | |
676 | ||
677 | b = scope->bindings; | |
678 | gcc_assert (b->decl == label); | |
679 | label_vars->shadowed = b->u.label; | |
680 | b->u.label = label_vars; | |
681 | } | |
51ef3909 | 682 | \f |
fc7d78c7 | 683 | /* Hook called at end of compilation to assume 1 elt |
6e899616 | 684 | for a file-scope tentative array defn that wasn't complete before. */ |
4214af46 | 685 | |
fc7d78c7 | 686 | void |
1cae46be | 687 | c_finish_incomplete_decl (tree decl) |
fc7d78c7 | 688 | { |
d7f020e8 | 689 | if (TREE_CODE (decl) == VAR_DECL) |
fc7d78c7 | 690 | { |
691 | tree type = TREE_TYPE (decl); | |
d7f020e8 | 692 | if (type != error_mark_node |
693 | && TREE_CODE (type) == ARRAY_TYPE | |
84166705 | 694 | && !DECL_EXTERNAL (decl) |
d7f020e8 | 695 | && TYPE_DOMAIN (type) == 0) |
fc7d78c7 | 696 | { |
e60a6f7b | 697 | warning_at (DECL_SOURCE_LOCATION (decl), |
698 | 0, "array %q+D assumed to have one element", decl); | |
d7f020e8 | 699 | |
c271bdb2 | 700 | complete_array_type (&TREE_TYPE (decl), NULL_TREE, true); |
fc7d78c7 | 701 | |
702 | layout_decl (decl, 0); | |
703 | } | |
704 | } | |
705 | } | |
706 | \f | |
551ed71a | 707 | /* Record that inline function FUNC contains a reference (location |
708 | LOC) to static DECL (file-scope or function-local according to | |
709 | TYPE). */ | |
710 | ||
711 | void | |
712 | record_inline_static (location_t loc, tree func, tree decl, | |
713 | enum c_inline_static_type type) | |
714 | { | |
715 | struct c_inline_static *csi = GGC_NEW (struct c_inline_static); | |
716 | csi->location = loc; | |
717 | csi->function = func; | |
718 | csi->static_decl = decl; | |
719 | csi->type = type; | |
720 | csi->next = c_inline_statics; | |
721 | c_inline_statics = csi; | |
722 | } | |
723 | ||
724 | /* Check for references to static declarations in inline functions at | |
725 | the end of the translation unit and diagnose them if the functions | |
726 | are still inline definitions. */ | |
727 | ||
728 | static void | |
729 | check_inline_statics (void) | |
730 | { | |
731 | struct c_inline_static *csi; | |
732 | for (csi = c_inline_statics; csi; csi = csi->next) | |
733 | { | |
734 | if (DECL_EXTERNAL (csi->function)) | |
735 | switch (csi->type) | |
736 | { | |
737 | case csi_internal: | |
738 | pedwarn (csi->location, 0, | |
739 | "%qD is static but used in inline function %qD " | |
740 | "which is not static", csi->static_decl, csi->function); | |
741 | break; | |
742 | case csi_modifiable: | |
743 | pedwarn (csi->location, 0, | |
744 | "%q+D is static but declared in inline function %qD " | |
745 | "which is not static", csi->static_decl, csi->function); | |
746 | break; | |
747 | default: | |
748 | gcc_unreachable (); | |
749 | } | |
750 | } | |
751 | c_inline_statics = NULL; | |
752 | } | |
753 | \f | |
f805d53d | 754 | /* Fill in a c_spot_bindings structure. If DEFINING is true, set it |
755 | for the current state, otherwise set it to uninitialized. */ | |
756 | ||
757 | static void | |
758 | set_spot_bindings (struct c_spot_bindings *p, bool defining) | |
759 | { | |
760 | if (defining) | |
761 | { | |
762 | p->scope = current_scope; | |
763 | p->bindings_in_scope = current_scope->bindings; | |
764 | } | |
765 | else | |
766 | { | |
767 | p->scope = NULL; | |
768 | p->bindings_in_scope = NULL; | |
769 | } | |
770 | p->stmt_exprs = 0; | |
771 | p->left_stmt_expr = false; | |
772 | } | |
773 | ||
774 | /* Return true if we will want to say something if a goto statement | |
775 | crosses DECL. */ | |
776 | ||
777 | static bool | |
778 | decl_jump_unsafe (tree decl) | |
779 | { | |
780 | if (decl == error_mark_node || TREE_TYPE (decl) == error_mark_node) | |
781 | return false; | |
782 | ||
783 | /* Always warn about crossing variably modified types. */ | |
784 | if ((TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == TYPE_DECL) | |
785 | && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) | |
786 | return true; | |
787 | ||
788 | /* Otherwise, only warn if -Wgoto-misses-init and this is an | |
789 | initialized automatic decl. */ | |
790 | if (warn_jump_misses_init | |
791 | && TREE_CODE (decl) == VAR_DECL | |
792 | && !TREE_STATIC (decl) | |
793 | && DECL_INITIAL (decl) != NULL_TREE) | |
794 | return true; | |
795 | ||
796 | return false; | |
797 | } | |
798 | ||
799 | /* Update spot bindings P as we pop out of SCOPE. Return true if we | |
800 | should push decls for a label. */ | |
801 | ||
802 | static bool | |
803 | update_spot_bindings (struct c_scope *scope, struct c_spot_bindings *p) | |
804 | { | |
805 | if (p->scope != scope) | |
806 | { | |
807 | /* This label or goto is defined in some other scope, or it is a | |
808 | label which is not yet defined. There is nothing to | |
809 | update. */ | |
810 | return false; | |
811 | } | |
812 | ||
813 | /* Adjust the spot bindings to refer to the bindings already defined | |
814 | in the enclosing scope. */ | |
815 | p->scope = scope->outer; | |
816 | p->bindings_in_scope = p->scope->bindings; | |
817 | ||
818 | return true; | |
819 | } | |
820 | \f | |
c17b85ea | 821 | /* The Objective-C front-end often needs to determine the current scope. */ |
822 | ||
823 | void * | |
99d7d801 | 824 | objc_get_current_scope (void) |
c17b85ea | 825 | { |
826 | return current_scope; | |
827 | } | |
828 | ||
829 | /* The following function is used only by Objective-C. It needs to live here | |
830 | because it accesses the innards of c_scope. */ | |
831 | ||
832 | void | |
833 | objc_mark_locals_volatile (void *enclosing_blk) | |
834 | { | |
835 | struct c_scope *scope; | |
393b349a | 836 | struct c_binding *b; |
d9cf68bf | 837 | |
838 | for (scope = current_scope; | |
c17b85ea | 839 | scope && scope != enclosing_blk; |
840 | scope = scope->outer) | |
841 | { | |
393b349a | 842 | for (b = scope->bindings; b; b = b->prev) |
34d3c5de | 843 | objc_volatilize_decl (b->decl); |
393b349a | 844 | |
c17b85ea | 845 | /* Do not climb up past the current function. */ |
846 | if (scope->function_body) | |
847 | break; | |
d9cf68bf | 848 | } |
849 | } | |
850 | ||
393b349a | 851 | /* Nonzero if we are currently in file scope. */ |
51ef3909 | 852 | |
853 | int | |
1cae46be | 854 | global_bindings_p (void) |
51ef3909 | 855 | { |
7fc1e5fb | 856 | return (current_scope == file_scope && !c_override_global_bindings_to_false |
857 | ? -1 | |
858 | : 0); | |
51ef3909 | 859 | } |
860 | ||
861 | void | |
1cae46be | 862 | keep_next_level (void) |
51ef3909 | 863 | { |
bdc33d98 | 864 | keep_next_level_flag = true; |
51ef3909 | 865 | } |
866 | ||
3ae3a17f | 867 | /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */ |
868 | ||
869 | void | |
870 | set_float_const_decimal64 (void) | |
871 | { | |
872 | current_scope->float_const_decimal64 = true; | |
873 | } | |
874 | ||
875 | /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */ | |
876 | ||
877 | void | |
878 | clear_float_const_decimal64 (void) | |
879 | { | |
880 | current_scope->float_const_decimal64 = false; | |
881 | } | |
882 | ||
883 | /* Return nonzero if an unsuffixed float constant is _Decimal64. */ | |
884 | ||
885 | bool | |
886 | float_const_decimal64_p (void) | |
887 | { | |
888 | return current_scope->float_const_decimal64; | |
889 | } | |
890 | ||
6e899616 | 891 | /* Identify this scope as currently being filled with parameters. */ |
51ef3909 | 892 | |
893 | void | |
2b652cf3 | 894 | declare_parm_level (void) |
51ef3909 | 895 | { |
6e899616 | 896 | current_scope->parm_flag = true; |
51ef3909 | 897 | } |
898 | ||
51ef3909 | 899 | void |
393b349a | 900 | push_scope (void) |
51ef3909 | 901 | { |
e69f6ec7 | 902 | if (next_is_function_body) |
51ef3909 | 903 | { |
31ddae9f | 904 | /* This is the transition from the parameters to the top level |
905 | of the function body. These are the same scope | |
6e899616 | 906 | (C99 6.2.1p4,6) so we do not push another scope structure. |
e69f6ec7 | 907 | next_is_function_body is set only by store_parm_decls, which |
908 | in turn is called when and only when we are about to | |
909 | encounter the opening curly brace for the function body. | |
31ddae9f | 910 | |
e69f6ec7 | 911 | The outermost block of a function always gets a BLOCK node, |
912 | because the debugging output routines expect that each | |
7981458e | 913 | function has at least one BLOCK. */ |
6e899616 | 914 | current_scope->parm_flag = false; |
915 | current_scope->function_body = true; | |
e69f6ec7 | 916 | current_scope->keep = true; |
6e899616 | 917 | current_scope->outer_function = current_function_scope; |
918 | current_function_scope = current_scope; | |
bdc33d98 | 919 | |
920 | keep_next_level_flag = false; | |
e69f6ec7 | 921 | next_is_function_body = false; |
3ae3a17f | 922 | |
923 | /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */ | |
924 | if (current_scope->outer) | |
925 | current_scope->float_const_decimal64 | |
926 | = current_scope->outer->float_const_decimal64; | |
927 | else | |
928 | current_scope->float_const_decimal64 = false; | |
51ef3909 | 929 | } |
31ddae9f | 930 | else |
931 | { | |
393b349a | 932 | struct c_scope *scope; |
933 | if (scope_freelist) | |
934 | { | |
935 | scope = scope_freelist; | |
936 | scope_freelist = scope->outer; | |
937 | } | |
938 | else | |
9318f22c | 939 | scope = GGC_CNEW (struct c_scope); |
51ef3909 | 940 | |
3ae3a17f | 941 | /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */ |
942 | if (current_scope) | |
943 | scope->float_const_decimal64 = current_scope->float_const_decimal64; | |
944 | else | |
945 | scope->float_const_decimal64 = false; | |
946 | ||
6e899616 | 947 | scope->keep = keep_next_level_flag; |
948 | scope->outer = current_scope; | |
393b349a | 949 | scope->depth = current_scope ? (current_scope->depth + 1) : 0; |
950 | ||
951 | /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but | |
952 | possible. */ | |
953 | if (current_scope && scope->depth == 0) | |
954 | { | |
955 | scope->depth--; | |
4742c91a | 956 | sorry ("GCC supports only %u nested scopes", scope->depth); |
393b349a | 957 | } |
14338e9a | 958 | |
6e899616 | 959 | current_scope = scope; |
960 | keep_next_level_flag = false; | |
31ddae9f | 961 | } |
cbf025c5 | 962 | } |
4214af46 | 963 | |
f805d53d | 964 | /* This is called when we are leaving SCOPE. For each label defined |
965 | in SCOPE, add any appropriate decls to its decls_in_scope fields. | |
966 | These are the decls whose initialization will be skipped by a goto | |
967 | later in the function. */ | |
968 | ||
969 | static void | |
970 | update_label_decls (struct c_scope *scope) | |
971 | { | |
972 | struct c_scope *s; | |
973 | ||
974 | s = scope; | |
975 | while (s != NULL) | |
976 | { | |
977 | if (s->has_label_bindings) | |
978 | { | |
979 | struct c_binding *b; | |
980 | ||
981 | for (b = s->bindings; b != NULL; b = b->prev) | |
982 | { | |
983 | struct c_label_vars *label_vars; | |
984 | struct c_binding *b1; | |
985 | unsigned int ix; | |
986 | struct c_goto_bindings *g; | |
987 | ||
988 | if (TREE_CODE (b->decl) != LABEL_DECL) | |
989 | continue; | |
990 | label_vars = b->u.label; | |
991 | ||
992 | b1 = label_vars->label_bindings.bindings_in_scope; | |
993 | if (update_spot_bindings (scope, &label_vars->label_bindings)) | |
994 | { | |
995 | /* This label is defined in this scope. */ | |
996 | for (; b1 != NULL; b1 = b1->prev) | |
997 | { | |
998 | /* A goto from later in the function to this | |
999 | label will never see the initialization of | |
1000 | B1, if any. Save it to issue a warning if | |
1001 | needed. */ | |
1002 | if (decl_jump_unsafe (b1->decl)) | |
1003 | VEC_safe_push (tree, gc, label_vars->decls_in_scope, | |
1004 | b1->decl); | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | /* Update the bindings of any goto statements associated | |
1009 | with this label. */ | |
1010 | for (ix = 0; | |
1011 | VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g); | |
1012 | ++ix) | |
1013 | update_spot_bindings (scope, &g->goto_bindings); | |
1014 | } | |
1015 | } | |
1016 | ||
1017 | /* Don't search beyond the current function. */ | |
1018 | if (s == current_function_scope) | |
1019 | break; | |
1020 | ||
1021 | s = s->outer; | |
1022 | } | |
1023 | } | |
1024 | ||
b3e83e1e | 1025 | /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */ |
1026 | ||
1027 | static void | |
1028 | set_type_context (tree type, tree context) | |
1029 | { | |
1030 | for (type = TYPE_MAIN_VARIANT (type); type; | |
1031 | type = TYPE_NEXT_VARIANT (type)) | |
1032 | TYPE_CONTEXT (type) = context; | |
1033 | } | |
1034 | ||
6e899616 | 1035 | /* Exit a scope. Restore the state of the identifier-decl mappings |
393b349a | 1036 | that were in effect when this scope was entered. Return a BLOCK |
1037 | node containing all the DECLs in this scope that are of interest | |
1038 | to debug info generation. */ | |
51ef3909 | 1039 | |
1040 | tree | |
393b349a | 1041 | pop_scope (void) |
51ef3909 | 1042 | { |
3bdb6310 | 1043 | struct c_scope *scope = current_scope; |
393b349a | 1044 | tree block, context, p; |
1045 | struct c_binding *b; | |
a0c21e2b | 1046 | |
393b349a | 1047 | bool functionbody = scope->function_body; |
1048 | bool keep = functionbody || scope->keep || scope->bindings; | |
3bdb6310 | 1049 | |
f805d53d | 1050 | update_label_decls (scope); |
f5d156fd | 1051 | |
3bdb6310 | 1052 | /* If appropriate, create a BLOCK to record the decls for the life |
1053 | of this function. */ | |
1054 | block = 0; | |
1055 | if (keep) | |
1056 | { | |
1057 | block = make_node (BLOCK); | |
3bdb6310 | 1058 | BLOCK_SUBBLOCKS (block) = scope->blocks; |
1059 | TREE_USED (block) = 1; | |
3bdb6310 | 1060 | |
393b349a | 1061 | /* In each subblock, record that this is its superior. */ |
93110716 | 1062 | for (p = scope->blocks; p; p = BLOCK_CHAIN (p)) |
393b349a | 1063 | BLOCK_SUPERCONTEXT (p) = block; |
3bdb6310 | 1064 | |
393b349a | 1065 | BLOCK_VARS (block) = 0; |
1066 | } | |
31ddae9f | 1067 | |
393b349a | 1068 | /* The TYPE_CONTEXTs for all of the tagged types belonging to this |
1069 | scope must be set so that they point to the appropriate | |
1070 | construct, i.e. either to the current FUNCTION_DECL node, or | |
1071 | else to the BLOCK node we just constructed. | |
3bdb6310 | 1072 | |
393b349a | 1073 | Note that for tagged types whose scope is just the formal |
1074 | parameter list for some function type specification, we can't | |
1075 | properly set their TYPE_CONTEXTs here, because we don't have a | |
1076 | pointer to the appropriate FUNCTION_TYPE node readily available | |
1077 | to us. For those cases, the TYPE_CONTEXTs of the relevant tagged | |
1078 | type nodes get set in `grokdeclarator' as soon as we have created | |
1079 | the FUNCTION_TYPE node which will represent the "scope" for these | |
1080 | "parameter list local" tagged types. */ | |
1081 | if (scope->function_body) | |
1082 | context = current_function_decl; | |
1083 | else if (scope == file_scope) | |
4d714d55 | 1084 | { |
e60a6f7b | 1085 | tree file_decl = build_decl (UNKNOWN_LOCATION, |
1086 | TRANSLATION_UNIT_DECL, 0, 0); | |
4d714d55 | 1087 | TREE_CHAIN (file_decl) = all_translation_units; |
1088 | all_translation_units = file_decl; | |
1089 | context = file_decl; | |
1090 | } | |
393b349a | 1091 | else |
1092 | context = block; | |
3bdb6310 | 1093 | |
393b349a | 1094 | /* Clear all bindings in this scope. */ |
1095 | for (b = scope->bindings; b; b = free_binding_and_advance (b)) | |
31ddae9f | 1096 | { |
393b349a | 1097 | p = b->decl; |
3bdb6310 | 1098 | switch (TREE_CODE (p)) |
bdc33d98 | 1099 | { |
3bdb6310 | 1100 | case LABEL_DECL: |
393b349a | 1101 | /* Warnings for unused labels, errors for undefined labels. */ |
3bdb6310 | 1102 | if (TREE_USED (p) && !DECL_INITIAL (p)) |
bdc33d98 | 1103 | { |
3cf8b391 | 1104 | error ("label %q+D used but not defined", p); |
3bdb6310 | 1105 | DECL_INITIAL (p) = error_mark_node; |
bdc33d98 | 1106 | } |
92fccaaa | 1107 | else |
1108 | warn_for_unused_label (p); | |
1109 | ||
393b349a | 1110 | /* Labels go in BLOCK_VARS. */ |
1111 | TREE_CHAIN (p) = BLOCK_VARS (block); | |
1112 | BLOCK_VARS (block) = p; | |
231bd014 | 1113 | gcc_assert (I_LABEL_BINDING (b->id) == b); |
a0c938f0 | 1114 | I_LABEL_BINDING (b->id) = b->shadowed; |
f805d53d | 1115 | |
1116 | /* Also pop back to the shadowed label_vars. */ | |
1117 | release_tree_vector (b->u.label->decls_in_scope); | |
1118 | b->u.label = b->u.label->shadowed; | |
a0c938f0 | 1119 | break; |
31ddae9f | 1120 | |
393b349a | 1121 | case ENUMERAL_TYPE: |
1122 | case UNION_TYPE: | |
1123 | case RECORD_TYPE: | |
b3e83e1e | 1124 | set_type_context (p, context); |
393b349a | 1125 | |
1126 | /* Types may not have tag-names, in which case the type | |
1127 | appears in the bindings list with b->id NULL. */ | |
1128 | if (b->id) | |
1129 | { | |
231bd014 | 1130 | gcc_assert (I_TAG_BINDING (b->id) == b); |
393b349a | 1131 | I_TAG_BINDING (b->id) = b->shadowed; |
1132 | } | |
a0c938f0 | 1133 | break; |
31ddae9f | 1134 | |
3bdb6310 | 1135 | case FUNCTION_DECL: |
393b349a | 1136 | /* Propagate TREE_ADDRESSABLE from nested functions to their |
1137 | containing functions. */ | |
84166705 | 1138 | if (!TREE_ASM_WRITTEN (p) |
3bdb6310 | 1139 | && DECL_INITIAL (p) != 0 |
1140 | && TREE_ADDRESSABLE (p) | |
1141 | && DECL_ABSTRACT_ORIGIN (p) != 0 | |
1142 | && DECL_ABSTRACT_ORIGIN (p) != p) | |
1143 | TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1; | |
8a1f0315 | 1144 | if (!DECL_EXTERNAL (p) |
c42cc79e | 1145 | && !DECL_INITIAL (p) |
1146 | && scope != file_scope | |
1147 | && scope != external_scope) | |
8a1f0315 | 1148 | { |
3cf8b391 | 1149 | error ("nested function %q+D declared but never defined", p); |
8a1f0315 | 1150 | undef_nested_function = true; |
1151 | } | |
c42cc79e | 1152 | else if (DECL_DECLARED_INLINE_P (p) |
1153 | && TREE_PUBLIC (p) | |
709cdea6 | 1154 | && !DECL_INITIAL (p)) |
1155 | { | |
1156 | /* C99 6.7.4p6: "a function with external linkage... declared | |
1157 | with an inline function specifier ... shall also be defined | |
1158 | in the same translation unit." */ | |
1159 | if (!flag_gnu89_inline) | |
1160 | pedwarn (input_location, 0, | |
1161 | "inline function %q+D declared but never defined", p); | |
1162 | DECL_EXTERNAL (p) = 1; | |
1163 | } | |
c42cc79e | 1164 | |
393b349a | 1165 | goto common_symbol; |
3bdb6310 | 1166 | |
1167 | case VAR_DECL: | |
491e04ef | 1168 | /* Warnings for unused variables. */ |
6bf97f82 | 1169 | if (!TREE_USED (p) |
8babbffa | 1170 | && !TREE_NO_WARNING (p) |
3bdb6310 | 1171 | && !DECL_IN_SYSTEM_HEADER (p) |
1172 | && DECL_NAME (p) | |
393b349a | 1173 | && !DECL_ARTIFICIAL (p) |
f98b02b2 | 1174 | && scope != file_scope |
a0c938f0 | 1175 | && scope != external_scope) |
3cf8b391 | 1176 | warning (OPT_Wunused_variable, "unused variable %q+D", p); |
393b349a | 1177 | |
606a02e3 | 1178 | if (b->inner_comp) |
1179 | { | |
3cf8b391 | 1180 | error ("type of array %q+D completed incompatibly with" |
1181 | " implicit initialization", p); | |
606a02e3 | 1182 | } |
1183 | ||
aab2cf92 | 1184 | /* Fall through. */ |
393b349a | 1185 | case TYPE_DECL: |
1186 | case CONST_DECL: | |
1187 | common_symbol: | |
1188 | /* All of these go in BLOCK_VARS, but only if this is the | |
1189 | binding in the home scope. */ | |
4194491a | 1190 | if (!b->nested) |
393b349a | 1191 | { |
1192 | TREE_CHAIN (p) = BLOCK_VARS (block); | |
1193 | BLOCK_VARS (block) = p; | |
1194 | } | |
6fb80942 | 1195 | else if (VAR_OR_FUNCTION_DECL_P (p)) |
1196 | { | |
1197 | /* For block local externs add a special | |
1198 | DECL_EXTERNAL decl for debug info generation. */ | |
1199 | tree extp = copy_node (p); | |
1200 | ||
1201 | DECL_EXTERNAL (extp) = 1; | |
1202 | TREE_STATIC (extp) = 0; | |
1203 | TREE_PUBLIC (extp) = 1; | |
1204 | DECL_INITIAL (extp) = NULL_TREE; | |
1205 | DECL_LANG_SPECIFIC (extp) = NULL; | |
1206 | DECL_CONTEXT (extp) = current_function_decl; | |
1207 | if (TREE_CODE (p) == FUNCTION_DECL) | |
1208 | { | |
1209 | DECL_RESULT (extp) = NULL_TREE; | |
1210 | DECL_SAVED_TREE (extp) = NULL_TREE; | |
1211 | DECL_STRUCT_FUNCTION (extp) = NULL; | |
1212 | } | |
1213 | if (b->locus != UNKNOWN_LOCATION) | |
1214 | DECL_SOURCE_LOCATION (extp) = b->locus; | |
1215 | TREE_CHAIN (extp) = BLOCK_VARS (block); | |
1216 | BLOCK_VARS (block) = extp; | |
1217 | } | |
ae0686dd | 1218 | /* If this is the file scope, and we are processing more |
1219 | than one translation unit in this compilation, set | |
1220 | DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL. | |
1221 | This makes same_translation_unit_p work, and causes | |
1222 | static declarations to be given disambiguating suffixes. */ | |
1223 | if (scope == file_scope && num_in_fnames > 1) | |
b3e83e1e | 1224 | { |
1225 | DECL_CONTEXT (p) = context; | |
1226 | if (TREE_CODE (p) == TYPE_DECL) | |
1227 | set_type_context (TREE_TYPE (p), context); | |
1228 | } | |
f74be9a1 | 1229 | |
393b349a | 1230 | /* Fall through. */ |
1231 | /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have | |
1232 | already been put there by store_parm_decls. Unused- | |
1233 | parameter warnings are handled by function.c. | |
1234 | error_mark_node obviously does not go in BLOCK_VARS and | |
1235 | does not get unused-variable warnings. */ | |
1236 | case PARM_DECL: | |
1237 | case ERROR_MARK: | |
1238 | /* It is possible for a decl not to have a name. We get | |
1239 | here with b->id NULL in this case. */ | |
1240 | if (b->id) | |
3bdb6310 | 1241 | { |
231bd014 | 1242 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); |
393b349a | 1243 | I_SYMBOL_BINDING (b->id) = b->shadowed; |
f805d53d | 1244 | if (b->shadowed && b->shadowed->u.type) |
1245 | TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type; | |
3bdb6310 | 1246 | } |
1247 | break; | |
393b349a | 1248 | |
1249 | default: | |
231bd014 | 1250 | gcc_unreachable (); |
3bdb6310 | 1251 | } |
1252 | } | |
31ddae9f | 1253 | |
14338e9a | 1254 | |
393b349a | 1255 | /* Dispose of the block that we just made inside some higher level. */ |
1256 | if ((scope->function_body || scope == file_scope) && context) | |
31ddae9f | 1257 | { |
393b349a | 1258 | DECL_INITIAL (context) = block; |
1259 | BLOCK_SUPERCONTEXT (block) = context; | |
31ddae9f | 1260 | } |
3bdb6310 | 1261 | else if (scope->outer) |
8862e8ce | 1262 | { |
3bdb6310 | 1263 | if (block) |
1264 | SCOPE_LIST_APPEND (scope->outer, blocks, block); | |
1265 | /* If we did not make a block for the scope just exited, any | |
1266 | blocks made for inner scopes must be carried forward so they | |
1267 | will later become subblocks of something else. */ | |
1268 | else if (scope->blocks) | |
1269 | SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks); | |
8862e8ce | 1270 | } |
51ef3909 | 1271 | |
6e899616 | 1272 | /* Pop the current scope, and free the structure for reuse. */ |
393b349a | 1273 | current_scope = scope->outer; |
1274 | if (scope->function_body) | |
1275 | current_function_scope = scope->outer_function; | |
1276 | ||
1277 | memset (scope, 0, sizeof (struct c_scope)); | |
1278 | scope->outer = scope_freelist; | |
1279 | scope_freelist = scope; | |
51ef3909 | 1280 | |
51ef3909 | 1281 | return block; |
1282 | } | |
8862e8ce | 1283 | |
393b349a | 1284 | void |
1285 | push_file_scope (void) | |
1286 | { | |
1287 | tree decl; | |
393b349a | 1288 | |
3d738236 | 1289 | if (file_scope) |
1290 | return; | |
1291 | ||
393b349a | 1292 | push_scope (); |
1293 | file_scope = current_scope; | |
1294 | ||
1295 | start_fname_decls (); | |
1296 | ||
1297 | for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl)) | |
4194491a | 1298 | bind (DECL_NAME (decl), decl, file_scope, |
6fb80942 | 1299 | /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl)); |
393b349a | 1300 | } |
1301 | ||
1302 | void | |
1303 | pop_file_scope (void) | |
1304 | { | |
1305 | /* In case there were missing closebraces, get us back to the global | |
1306 | binding level. */ | |
1307 | while (current_scope != file_scope) | |
1308 | pop_scope (); | |
1309 | ||
1310 | /* __FUNCTION__ is defined at file scope (""). This | |
1311 | call may not be necessary as my tests indicate it | |
1312 | still works without it. */ | |
1313 | finish_fname_decls (); | |
1314 | ||
551ed71a | 1315 | check_inline_statics (); |
1316 | ||
aea7e1dc | 1317 | /* This is the point to write out a PCH if we're doing that. |
1318 | In that case we do not want to do anything else. */ | |
393b349a | 1319 | if (pch_file) |
aea7e1dc | 1320 | { |
1321 | c_common_write_pch (); | |
1322 | return; | |
1323 | } | |
393b349a | 1324 | |
aea7e1dc | 1325 | /* Pop off the file scope and close this translation unit. */ |
393b349a | 1326 | pop_scope (); |
1327 | file_scope = 0; | |
8bc09a74 | 1328 | |
1329 | maybe_apply_pending_pragma_weaks (); | |
aea7e1dc | 1330 | cgraph_finalize_compilation_unit (); |
393b349a | 1331 | } |
f805d53d | 1332 | \f |
1333 | /* Adjust the bindings for the start of a statement expression. */ | |
1334 | ||
1335 | void | |
1336 | c_bindings_start_stmt_expr (struct c_spot_bindings* switch_bindings) | |
1337 | { | |
1338 | struct c_scope *scope; | |
1339 | ||
1340 | for (scope = current_scope; scope != NULL; scope = scope->outer) | |
1341 | { | |
1342 | struct c_binding *b; | |
1343 | ||
1344 | if (!scope->has_label_bindings) | |
1345 | continue; | |
1346 | ||
1347 | for (b = scope->bindings; b != NULL; b = b->prev) | |
1348 | { | |
1349 | struct c_label_vars *label_vars; | |
1350 | unsigned int ix; | |
1351 | struct c_goto_bindings *g; | |
1352 | ||
1353 | if (TREE_CODE (b->decl) != LABEL_DECL) | |
1354 | continue; | |
1355 | label_vars = b->u.label; | |
1356 | ++label_vars->label_bindings.stmt_exprs; | |
1357 | for (ix = 0; | |
1358 | VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g); | |
1359 | ++ix) | |
1360 | ++g->goto_bindings.stmt_exprs; | |
1361 | } | |
1362 | } | |
1363 | ||
1364 | if (switch_bindings != NULL) | |
1365 | ++switch_bindings->stmt_exprs; | |
1366 | } | |
1367 | ||
1368 | /* Adjust the bindings for the end of a statement expression. */ | |
1369 | ||
1370 | void | |
1371 | c_bindings_end_stmt_expr (struct c_spot_bindings *switch_bindings) | |
1372 | { | |
1373 | struct c_scope *scope; | |
1374 | ||
1375 | for (scope = current_scope; scope != NULL; scope = scope->outer) | |
1376 | { | |
1377 | struct c_binding *b; | |
1378 | ||
1379 | if (!scope->has_label_bindings) | |
1380 | continue; | |
1381 | ||
1382 | for (b = scope->bindings; b != NULL; b = b->prev) | |
1383 | { | |
1384 | struct c_label_vars *label_vars; | |
1385 | unsigned int ix; | |
1386 | struct c_goto_bindings *g; | |
1387 | ||
1388 | if (TREE_CODE (b->decl) != LABEL_DECL) | |
1389 | continue; | |
1390 | label_vars = b->u.label; | |
1391 | --label_vars->label_bindings.stmt_exprs; | |
1392 | if (label_vars->label_bindings.stmt_exprs < 0) | |
1393 | { | |
1394 | label_vars->label_bindings.left_stmt_expr = true; | |
1395 | label_vars->label_bindings.stmt_exprs = 0; | |
1396 | } | |
1397 | for (ix = 0; | |
1398 | VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g); | |
1399 | ++ix) | |
1400 | { | |
1401 | --g->goto_bindings.stmt_exprs; | |
1402 | if (g->goto_bindings.stmt_exprs < 0) | |
1403 | { | |
1404 | g->goto_bindings.left_stmt_expr = true; | |
1405 | g->goto_bindings.stmt_exprs = 0; | |
1406 | } | |
1407 | } | |
1408 | } | |
1409 | } | |
393b349a | 1410 | |
f805d53d | 1411 | if (switch_bindings != NULL) |
1412 | { | |
1413 | --switch_bindings->stmt_exprs; | |
1414 | gcc_assert (switch_bindings->stmt_exprs >= 0); | |
1415 | } | |
1416 | } | |
51ef3909 | 1417 | \f |
51ef3909 | 1418 | /* Push a definition or a declaration of struct, union or enum tag "name". |
1419 | "type" should be the type node. | |
e60a6f7b | 1420 | We assume that the tag "name" is not already defined, and has a location |
1421 | of LOC. | |
51ef3909 | 1422 | |
1423 | Note that the definition may really be just a forward reference. | |
1424 | In that case, the TYPE_SIZE will be zero. */ | |
1425 | ||
393b349a | 1426 | static void |
e60a6f7b | 1427 | pushtag (location_t loc, tree name, tree type) |
51ef3909 | 1428 | { |
b3924a2c | 1429 | /* Record the identifier as the type's name if it has none. */ |
393b349a | 1430 | if (name && !TYPE_NAME (type)) |
1431 | TYPE_NAME (type) = name; | |
0b09525f | 1432 | bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false, loc); |
c275c235 | 1433 | |
51ef3909 | 1434 | /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the |
6e899616 | 1435 | tagged type we just added to the current scope. This fake |
51ef3909 | 1436 | NULL-named TYPE_DECL node helps dwarfout.c to know when it needs |
df5e872e | 1437 | to output a representation of a tagged type, and it also gives |
51ef3909 | 1438 | us a convenient place to record the "scope start" address for the |
1439 | tagged type. */ | |
1440 | ||
e60a6f7b | 1441 | TYPE_STUB_DECL (type) = pushdecl (build_decl (loc, |
1442 | TYPE_DECL, NULL_TREE, type)); | |
464217f3 | 1443 | |
1444 | /* An approximation for now, so we can tell this is a function-scope tag. | |
393b349a | 1445 | This will be updated in pop_scope. */ |
464217f3 | 1446 | TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type)); |
26dbec0a | 1447 | |
1448 | if (warn_cxx_compat && name != NULL_TREE) | |
1449 | { | |
1450 | struct c_binding *b = I_SYMBOL_BINDING (name); | |
1451 | ||
1452 | if (b != NULL | |
1453 | && b->decl != NULL_TREE | |
1454 | && TREE_CODE (b->decl) == TYPE_DECL | |
1455 | && (B_IN_CURRENT_SCOPE (b) | |
1456 | || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b))) | |
1457 | && (TYPE_MAIN_VARIANT (TREE_TYPE (b->decl)) | |
1458 | != TYPE_MAIN_VARIANT (type))) | |
1459 | { | |
1460 | warning_at (loc, OPT_Wc___compat, | |
1461 | ("using %qD as both a typedef and a tag is " | |
1462 | "invalid in C++"), | |
1463 | b->decl); | |
1464 | if (b->locus != UNKNOWN_LOCATION) | |
1465 | inform (b->locus, "originally defined here"); | |
1466 | } | |
1467 | } | |
51ef3909 | 1468 | } |
1469 | \f | |
679bf177 | 1470 | /* Subroutine of compare_decls. Allow harmless mismatches in return |
c4dc8be9 | 1471 | and argument types provided that the type modes match. This function |
1472 | return a unified type given a suitable match, and 0 otherwise. */ | |
1473 | ||
1474 | static tree | |
679bf177 | 1475 | match_builtin_function_types (tree newtype, tree oldtype) |
c4dc8be9 | 1476 | { |
1477 | tree newrettype, oldrettype; | |
1478 | tree newargs, oldargs; | |
1479 | tree trytype, tryargs; | |
1480 | ||
1481 | /* Accept the return type of the new declaration if same modes. */ | |
1482 | oldrettype = TREE_TYPE (oldtype); | |
1483 | newrettype = TREE_TYPE (newtype); | |
1484 | ||
1485 | if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype)) | |
1486 | return 0; | |
1487 | ||
1488 | oldargs = TYPE_ARG_TYPES (oldtype); | |
1489 | newargs = TYPE_ARG_TYPES (newtype); | |
1490 | tryargs = newargs; | |
1491 | ||
1492 | while (oldargs || newargs) | |
1493 | { | |
84166705 | 1494 | if (!oldargs |
1495 | || !newargs | |
1496 | || !TREE_VALUE (oldargs) | |
1497 | || !TREE_VALUE (newargs) | |
c4dc8be9 | 1498 | || TYPE_MODE (TREE_VALUE (oldargs)) |
1499 | != TYPE_MODE (TREE_VALUE (newargs))) | |
1500 | return 0; | |
1501 | ||
1502 | oldargs = TREE_CHAIN (oldargs); | |
1503 | newargs = TREE_CHAIN (newargs); | |
1504 | } | |
1505 | ||
1506 | trytype = build_function_type (newrettype, tryargs); | |
1507 | return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype)); | |
1508 | } | |
1509 | ||
4885b286 | 1510 | /* Subroutine of diagnose_mismatched_decls. Check for function type |
679bf177 | 1511 | mismatch involving an empty arglist vs a nonempty one and give clearer |
7c2df241 | 1512 | diagnostics. */ |
679bf177 | 1513 | static void |
1514 | diagnose_arglist_conflict (tree newdecl, tree olddecl, | |
1515 | tree newtype, tree oldtype) | |
1516 | { | |
1517 | tree t; | |
51ef3909 | 1518 | |
679bf177 | 1519 | if (TREE_CODE (olddecl) != FUNCTION_DECL |
3ed275a6 | 1520 | || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype)) |
679bf177 | 1521 | || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0) |
1522 | || | |
1523 | (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0))) | |
1524 | return; | |
b33f0698 | 1525 | |
679bf177 | 1526 | t = TYPE_ARG_TYPES (oldtype); |
1527 | if (t == 0) | |
1528 | t = TYPE_ARG_TYPES (newtype); | |
1529 | for (; t; t = TREE_CHAIN (t)) | |
1530 | { | |
1531 | tree type = TREE_VALUE (t); | |
51ef3909 | 1532 | |
679bf177 | 1533 | if (TREE_CHAIN (t) == 0 |
1534 | && TYPE_MAIN_VARIANT (type) != void_type_node) | |
1535 | { | |
5bcc316e | 1536 | inform (input_location, "a parameter list with an ellipsis can%'t match " |
679bf177 | 1537 | "an empty parameter name list declaration"); |
1538 | break; | |
1539 | } | |
1540 | ||
1541 | if (c_type_promotes_to (type) != type) | |
1542 | { | |
5bcc316e | 1543 | inform (input_location, "an argument type that has a default promotion can%'t match " |
679bf177 | 1544 | "an empty parameter name list declaration"); |
1545 | break; | |
1546 | } | |
1547 | } | |
1548 | } | |
51ef3909 | 1549 | |
679bf177 | 1550 | /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an |
1551 | old-style function definition, NEWDECL is a prototype declaration. | |
1552 | Diagnose inconsistencies in the argument list. Returns TRUE if | |
1553 | the prototype is compatible, FALSE if not. */ | |
1554 | static bool | |
1555 | validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype) | |
1556 | { | |
2a222da1 | 1557 | tree newargs, oldargs; |
1558 | int i; | |
1559 | ||
97ca039c | 1560 | #define END_OF_ARGLIST(t) ((t) == void_type_node) |
2a222da1 | 1561 | |
1562 | oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype); | |
1563 | newargs = TYPE_ARG_TYPES (newtype); | |
1564 | i = 1; | |
1565 | ||
1566 | for (;;) | |
93f10b04 | 1567 | { |
cd27e3ac | 1568 | tree oldargtype = TREE_VALUE (oldargs); |
1569 | tree newargtype = TREE_VALUE (newargs); | |
1570 | ||
1571 | if (oldargtype == error_mark_node || newargtype == error_mark_node) | |
1572 | return false; | |
1573 | ||
1574 | oldargtype = TYPE_MAIN_VARIANT (oldargtype); | |
1575 | newargtype = TYPE_MAIN_VARIANT (newargtype); | |
2a222da1 | 1576 | |
1577 | if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype)) | |
1578 | break; | |
1579 | ||
1580 | /* Reaching the end of just one list means the two decls don't | |
1581 | agree on the number of arguments. */ | |
1582 | if (END_OF_ARGLIST (oldargtype)) | |
93f10b04 | 1583 | { |
3cf8b391 | 1584 | error ("prototype for %q+D declares more arguments " |
1585 | "than previous old-style definition", newdecl); | |
2a222da1 | 1586 | return false; |
93f10b04 | 1587 | } |
2a222da1 | 1588 | else if (END_OF_ARGLIST (newargtype)) |
679bf177 | 1589 | { |
3cf8b391 | 1590 | error ("prototype for %q+D declares fewer arguments " |
1591 | "than previous old-style definition", newdecl); | |
679bf177 | 1592 | return false; |
1593 | } | |
2a222da1 | 1594 | |
1595 | /* Type for passing arg must be consistent with that declared | |
1596 | for the arg. */ | |
84166705 | 1597 | else if (!comptypes (oldargtype, newargtype)) |
679bf177 | 1598 | { |
3cf8b391 | 1599 | error ("prototype for %q+D declares argument %d" |
07e3a3d2 | 1600 | " with incompatible type", |
3cf8b391 | 1601 | newdecl, i); |
679bf177 | 1602 | return false; |
1603 | } | |
2a222da1 | 1604 | |
1605 | oldargs = TREE_CHAIN (oldargs); | |
1606 | newargs = TREE_CHAIN (newargs); | |
1607 | i++; | |
93f10b04 | 1608 | } |
2a222da1 | 1609 | |
1610 | /* If we get here, no errors were found, but do issue a warning | |
1611 | for this poor-style construct. */ | |
3cf8b391 | 1612 | warning (0, "prototype for %q+D follows non-prototype definition", |
1613 | newdecl); | |
2a222da1 | 1614 | return true; |
1615 | #undef END_OF_ARGLIST | |
679bf177 | 1616 | } |
1f0395c4 | 1617 | |
679bf177 | 1618 | /* Subroutine of diagnose_mismatched_decls. Report the location of DECL, |
1619 | first in a pair of mismatched declarations, using the diagnostic | |
1620 | function DIAG. */ | |
1621 | static void | |
a52d5726 | 1622 | locate_old_decl (tree decl) |
679bf177 | 1623 | { |
1624 | if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl)) | |
1625 | ; | |
1626 | else if (DECL_INITIAL (decl)) | |
5bcc316e | 1627 | inform (input_location, "previous definition of %q+D was here", decl); |
679bf177 | 1628 | else if (C_DECL_IMPLICIT (decl)) |
5bcc316e | 1629 | inform (input_location, "previous implicit declaration of %q+D was here", decl); |
679bf177 | 1630 | else |
5bcc316e | 1631 | inform (input_location, "previous declaration of %q+D was here", decl); |
679bf177 | 1632 | } |
51ef3909 | 1633 | |
679bf177 | 1634 | /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL. |
1635 | Returns true if the caller should proceed to merge the two, false | |
1636 | if OLDDECL should simply be discarded. As a side effect, issues | |
1637 | all necessary diagnostics for invalid or poor-style combinations. | |
1638 | If it returns true, writes the types of NEWDECL and OLDDECL to | |
1639 | *NEWTYPEP and *OLDTYPEP - these may have been adjusted from | |
1640 | TREE_TYPE (NEWDECL, OLDDECL) respectively. */ | |
1641 | ||
1642 | static bool | |
1643 | diagnose_mismatched_decls (tree newdecl, tree olddecl, | |
1644 | tree *newtypep, tree *oldtypep) | |
1645 | { | |
1646 | tree newtype, oldtype; | |
1647 | bool pedwarned = false; | |
1648 | bool warned = false; | |
67be63e6 | 1649 | bool retval = true; |
679bf177 | 1650 | |
c195b9ad | 1651 | #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \ |
1652 | && DECL_EXTERNAL (DECL)) | |
1653 | ||
679bf177 | 1654 | /* If we have error_mark_node for either decl or type, just discard |
1655 | the previous decl - we're in an error cascade already. */ | |
1656 | if (olddecl == error_mark_node || newdecl == error_mark_node) | |
1657 | return false; | |
2a222da1 | 1658 | *oldtypep = oldtype = TREE_TYPE (olddecl); |
1659 | *newtypep = newtype = TREE_TYPE (newdecl); | |
679bf177 | 1660 | if (oldtype == error_mark_node || newtype == error_mark_node) |
1661 | return false; | |
1662 | ||
1663 | /* Two different categories of symbol altogether. This is an error | |
1664 | unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */ | |
51ef3909 | 1665 | if (TREE_CODE (olddecl) != TREE_CODE (newdecl)) |
1666 | { | |
393b349a | 1667 | if (!(TREE_CODE (olddecl) == FUNCTION_DECL |
1668 | && DECL_BUILT_IN (olddecl) | |
1669 | && !C_DECL_DECLARED_BUILTIN (olddecl))) | |
51ef3909 | 1670 | { |
3cf8b391 | 1671 | error ("%q+D redeclared as different kind of symbol", newdecl); |
a52d5726 | 1672 | locate_old_decl (olddecl); |
679bf177 | 1673 | } |
1674 | else if (TREE_PUBLIC (newdecl)) | |
3cf8b391 | 1675 | warning (0, "built-in function %q+D declared as non-function", |
1676 | newdecl); | |
8b6866af | 1677 | else |
3cf8b391 | 1678 | warning (OPT_Wshadow, "declaration of %q+D shadows " |
1679 | "a built-in function", newdecl); | |
679bf177 | 1680 | return false; |
1681 | } | |
1682 | ||
5dad28f1 | 1683 | /* Enumerators have no linkage, so may only be declared once in a |
1684 | given scope. */ | |
1685 | if (TREE_CODE (olddecl) == CONST_DECL) | |
1686 | { | |
3cf8b391 | 1687 | error ("redeclaration of enumerator %q+D", newdecl); |
a52d5726 | 1688 | locate_old_decl (olddecl); |
5dad28f1 | 1689 | return false; |
1690 | } | |
1691 | ||
3ed275a6 | 1692 | if (!comptypes (oldtype, newtype)) |
679bf177 | 1693 | { |
a3ad3e27 | 1694 | if (TREE_CODE (olddecl) == FUNCTION_DECL |
393b349a | 1695 | && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl)) |
679bf177 | 1696 | { |
1697 | /* Accept harmless mismatch in function types. | |
1698 | This is for the ffs and fprintf builtins. */ | |
1699 | tree trytype = match_builtin_function_types (newtype, oldtype); | |
1700 | ||
3ed275a6 | 1701 | if (trytype && comptypes (newtype, trytype)) |
2a222da1 | 1702 | *oldtypep = oldtype = trytype; |
679bf177 | 1703 | else |
51ef3909 | 1704 | { |
679bf177 | 1705 | /* If types don't match for a built-in, throw away the |
1706 | built-in. No point in calling locate_old_decl here, it | |
7c2df241 | 1707 | won't print anything. */ |
3cf8b391 | 1708 | warning (0, "conflicting types for built-in function %q+D", |
1709 | newdecl); | |
679bf177 | 1710 | return false; |
51ef3909 | 1711 | } |
679bf177 | 1712 | } |
1713 | else if (TREE_CODE (olddecl) == FUNCTION_DECL | |
9a6486a6 | 1714 | && DECL_IS_BUILTIN (olddecl)) |
679bf177 | 1715 | { |
1716 | /* A conflicting function declaration for a predeclared | |
1717 | function that isn't actually built in. Objective C uses | |
1718 | these. The new declaration silently overrides everything | |
1719 | but the volatility (i.e. noreturn) indication. See also | |
1720 | below. FIXME: Make Objective C use normal builtins. */ | |
1721 | TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl); | |
1722 | return false; | |
1723 | } | |
1724 | /* Permit void foo (...) to match int foo (...) if the latter is | |
1725 | the definition and implicit int was used. See | |
1726 | c-torture/compile/920625-2.c. */ | |
1727 | else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) | |
1728 | && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node | |
1729 | && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node | |
a49e09d9 | 1730 | && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl)) |
679bf177 | 1731 | { |
21ca8540 | 1732 | pedwarned = pedwarn (input_location, 0, |
1733 | "conflicting types for %q+D", newdecl); | |
679bf177 | 1734 | /* Make sure we keep void as the return type. */ |
2a222da1 | 1735 | TREE_TYPE (newdecl) = *newtypep = newtype = oldtype; |
679bf177 | 1736 | C_FUNCTION_IMPLICIT_INT (newdecl) = 0; |
51ef3909 | 1737 | } |
a49e09d9 | 1738 | /* Permit void foo (...) to match an earlier call to foo (...) with |
1739 | no declared type (thus, implicitly int). */ | |
1740 | else if (TREE_CODE (newdecl) == FUNCTION_DECL | |
1741 | && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node | |
1742 | && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node | |
1743 | && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl)) | |
1744 | { | |
21ca8540 | 1745 | pedwarned = pedwarn (input_location, 0, |
1746 | "conflicting types for %q+D", newdecl); | |
a49e09d9 | 1747 | /* Make sure we keep void as the return type. */ |
1748 | TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype; | |
a49e09d9 | 1749 | } |
51ef3909 | 1750 | else |
1751 | { | |
14338e9a | 1752 | if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype)) |
3cf8b391 | 1753 | error ("conflicting type qualifiers for %q+D", newdecl); |
14338e9a | 1754 | else |
3cf8b391 | 1755 | error ("conflicting types for %q+D", newdecl); |
679bf177 | 1756 | diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype); |
a52d5726 | 1757 | locate_old_decl (olddecl); |
679bf177 | 1758 | return false; |
51ef3909 | 1759 | } |
51ef3909 | 1760 | } |
1761 | ||
679bf177 | 1762 | /* Redeclaration of a type is a constraint violation (6.7.2.3p1), |
1763 | but silently ignore the redeclaration if either is in a system | |
1764 | header. (Conflicting redeclarations were handled above.) */ | |
1765 | if (TREE_CODE (newdecl) == TYPE_DECL) | |
31ddae9f | 1766 | { |
7cb6f926 | 1767 | if (DECL_IN_SYSTEM_HEADER (newdecl) |
1768 | || DECL_IN_SYSTEM_HEADER (olddecl) | |
1769 | || TREE_NO_WARNING (newdecl) | |
1770 | || TREE_NO_WARNING (olddecl)) | |
aab2cf92 | 1771 | return true; /* Allow OLDDECL to continue in use. */ |
14338e9a | 1772 | |
3cf8b391 | 1773 | error ("redefinition of typedef %q+D", newdecl); |
a52d5726 | 1774 | locate_old_decl (olddecl); |
679bf177 | 1775 | return false; |
31ddae9f | 1776 | } |
51ef3909 | 1777 | |
679bf177 | 1778 | /* Function declarations can either be 'static' or 'extern' (no |
1779 | qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore | |
c42cc79e | 1780 | can never conflict with each other on account of linkage |
1781 | (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but | |
1782 | gnu89 mode permits two definitions if one is 'extern inline' and | |
1783 | one is not. The non- extern-inline definition supersedes the | |
1784 | extern-inline definition. */ | |
c195b9ad | 1785 | |
679bf177 | 1786 | else if (TREE_CODE (newdecl) == FUNCTION_DECL) |
51ef3909 | 1787 | { |
32a8d34e | 1788 | /* If you declare a built-in function name as static, or |
1789 | define the built-in with an old-style definition (so we | |
1790 | can't validate the argument list) the built-in definition is | |
1791 | overridden, but optionally warn this was a bad choice of name. */ | |
1792 | if (DECL_BUILT_IN (olddecl) | |
393b349a | 1793 | && !C_DECL_DECLARED_BUILTIN (olddecl) |
32a8d34e | 1794 | && (!TREE_PUBLIC (newdecl) |
1795 | || (DECL_INITIAL (newdecl) | |
1796 | && !TYPE_ARG_TYPES (TREE_TYPE (newdecl))))) | |
51ef3909 | 1797 | { |
3cf8b391 | 1798 | warning (OPT_Wshadow, "declaration of %q+D shadows " |
1799 | "a built-in function", newdecl); | |
51ef3909 | 1800 | /* Discard the old built-in function. */ |
679bf177 | 1801 | return false; |
51ef3909 | 1802 | } |
14338e9a | 1803 | |
679bf177 | 1804 | if (DECL_INITIAL (newdecl)) |
594952f9 | 1805 | { |
67be63e6 | 1806 | if (DECL_INITIAL (olddecl)) |
c4dc8be9 | 1807 | { |
c195b9ad | 1808 | /* If both decls are in the same TU and the new declaration |
56d36a49 | 1809 | isn't overriding an extern inline reject the new decl. |
c42cc79e | 1810 | In c99, no overriding is allowed in the same translation |
1811 | unit. */ | |
1812 | if ((!DECL_EXTERN_INLINE (olddecl) | |
1813 | || DECL_EXTERN_INLINE (newdecl) | |
11950bdd | 1814 | || (!flag_gnu89_inline |
541e4101 | 1815 | && (!DECL_DECLARED_INLINE_P (olddecl) |
1816 | || !lookup_attribute ("gnu_inline", | |
1817 | DECL_ATTRIBUTES (olddecl))) | |
1818 | && (!DECL_DECLARED_INLINE_P (newdecl) | |
1819 | || !lookup_attribute ("gnu_inline", | |
1820 | DECL_ATTRIBUTES (newdecl)))) | |
541e4101 | 1821 | ) |
67be63e6 | 1822 | && same_translation_unit_p (newdecl, olddecl)) |
1823 | { | |
3cf8b391 | 1824 | error ("redefinition of %q+D", newdecl); |
a52d5726 | 1825 | locate_old_decl (olddecl); |
67be63e6 | 1826 | return false; |
1827 | } | |
c195b9ad | 1828 | } |
594952f9 | 1829 | } |
679bf177 | 1830 | /* If we have a prototype after an old-style function definition, |
1831 | the argument types must be checked specially. */ | |
1832 | else if (DECL_INITIAL (olddecl) | |
1833 | && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype) | |
1834 | && TYPE_ACTUAL_ARG_TYPES (oldtype) | |
1835 | && !validate_proto_after_old_defn (newdecl, newtype, oldtype)) | |
63b3279d | 1836 | { |
a52d5726 | 1837 | locate_old_decl (olddecl); |
679bf177 | 1838 | return false; |
63b3279d | 1839 | } |
4194491a | 1840 | /* A non-static declaration (even an "extern") followed by a |
1841 | static declaration is undefined behavior per C99 6.2.2p3-5,7. | |
1842 | The same is true for a static forward declaration at block | |
1843 | scope followed by a non-static declaration/definition at file | |
1844 | scope. Static followed by non-static at the same scope is | |
1845 | not undefined behavior, and is the most convenient way to get | |
1846 | some effects (see e.g. what unwind-dw2-fde-glibc.c does to | |
1847 | the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but | |
fbf0afd1 | 1848 | we do diagnose it if -Wtraditional. */ |
679bf177 | 1849 | if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl)) |
51ef3909 | 1850 | { |
4194491a | 1851 | /* Two exceptions to the rule. If olddecl is an extern |
1852 | inline, or a predeclared function that isn't actually | |
1853 | built in, newdecl silently overrides olddecl. The latter | |
1854 | occur only in Objective C; see also above. (FIXME: Make | |
1855 | Objective C use normal builtins.) */ | |
1856 | if (!DECL_IS_BUILTIN (olddecl) | |
c195b9ad | 1857 | && !DECL_EXTERN_INLINE (olddecl)) |
679bf177 | 1858 | { |
3cf8b391 | 1859 | error ("static declaration of %q+D follows " |
1860 | "non-static declaration", newdecl); | |
a52d5726 | 1861 | locate_old_decl (olddecl); |
679bf177 | 1862 | } |
4194491a | 1863 | return false; |
51ef3909 | 1864 | } |
4194491a | 1865 | else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl)) |
97ed1d3b | 1866 | { |
4194491a | 1867 | if (DECL_CONTEXT (olddecl)) |
1868 | { | |
3cf8b391 | 1869 | error ("non-static declaration of %q+D follows " |
1870 | "static declaration", newdecl); | |
a52d5726 | 1871 | locate_old_decl (olddecl); |
4194491a | 1872 | return false; |
1873 | } | |
1874 | else if (warn_traditional) | |
1875 | { | |
a52d5726 | 1876 | warned |= warning (OPT_Wtraditional, |
1877 | "non-static declaration of %q+D " | |
1878 | "follows static declaration", newdecl); | |
4194491a | 1879 | } |
97ed1d3b | 1880 | } |
541e4101 | 1881 | |
1882 | /* Make sure gnu_inline attribute is either not present, or | |
1883 | present on all inline decls. */ | |
1884 | if (DECL_DECLARED_INLINE_P (olddecl) | |
1885 | && DECL_DECLARED_INLINE_P (newdecl)) | |
1886 | { | |
1887 | bool newa = lookup_attribute ("gnu_inline", | |
1888 | DECL_ATTRIBUTES (newdecl)) != NULL; | |
1889 | bool olda = lookup_attribute ("gnu_inline", | |
1890 | DECL_ATTRIBUTES (olddecl)) != NULL; | |
1891 | if (newa != olda) | |
1892 | { | |
712d2297 | 1893 | error_at (input_location, "%<gnu_inline%> attribute present on %q+D", |
1894 | newa ? newdecl : olddecl); | |
1895 | error_at (DECL_SOURCE_LOCATION (newa ? olddecl : newdecl), | |
1896 | "but not here"); | |
541e4101 | 1897 | } |
1898 | } | |
51ef3909 | 1899 | } |
679bf177 | 1900 | else if (TREE_CODE (newdecl) == VAR_DECL) |
31ddae9f | 1901 | { |
679bf177 | 1902 | /* Only variables can be thread-local, and all declarations must |
1903 | agree on this property. */ | |
1e8e9920 | 1904 | if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl)) |
1905 | { | |
1906 | /* Nothing to check. Since OLDDECL is marked threadprivate | |
1907 | and NEWDECL does not have a thread-local attribute, we | |
1908 | will merge the threadprivate attribute into NEWDECL. */ | |
1909 | ; | |
1910 | } | |
1911 | else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)) | |
51ef3909 | 1912 | { |
1b53eb20 | 1913 | if (DECL_THREAD_LOCAL_P (newdecl)) |
3cf8b391 | 1914 | error ("thread-local declaration of %q+D follows " |
1915 | "non-thread-local declaration", newdecl); | |
679bf177 | 1916 | else |
3cf8b391 | 1917 | error ("non-thread-local declaration of %q+D follows " |
1918 | "thread-local declaration", newdecl); | |
51ef3909 | 1919 | |
a52d5726 | 1920 | locate_old_decl (olddecl); |
679bf177 | 1921 | return false; |
1922 | } | |
51ef3909 | 1923 | |
679bf177 | 1924 | /* Multiple initialized definitions are not allowed (6.9p3,5). */ |
1925 | if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl)) | |
1926 | { | |
3cf8b391 | 1927 | error ("redefinition of %q+D", newdecl); |
a52d5726 | 1928 | locate_old_decl (olddecl); |
679bf177 | 1929 | return false; |
1930 | } | |
1931 | ||
4194491a | 1932 | /* Objects declared at file scope: if the first declaration had |
1933 | external linkage (even if it was an external reference) the | |
1934 | second must have external linkage as well, or the behavior is | |
1935 | undefined. If the first declaration had internal linkage, then | |
1936 | the second must too, or else be an external reference (in which | |
1937 | case the composite declaration still has internal linkage). | |
1938 | As for function declarations, we warn about the static-then- | |
1939 | extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */ | |
1940 | if (DECL_FILE_SCOPE_P (newdecl) | |
1941 | && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl)) | |
679bf177 | 1942 | { |
4194491a | 1943 | if (DECL_EXTERNAL (newdecl)) |
1944 | { | |
f23d7b7f | 1945 | if (!DECL_FILE_SCOPE_P (olddecl)) |
1946 | { | |
3cf8b391 | 1947 | error ("extern declaration of %q+D follows " |
1948 | "declaration with no linkage", newdecl); | |
a52d5726 | 1949 | locate_old_decl (olddecl); |
f23d7b7f | 1950 | return false; |
1951 | } | |
1952 | else if (warn_traditional) | |
4194491a | 1953 | { |
a52d5726 | 1954 | warned |= warning (OPT_Wtraditional, |
1955 | "non-static declaration of %q+D " | |
1956 | "follows static declaration", newdecl); | |
4194491a | 1957 | } |
1958 | } | |
1959 | else | |
679bf177 | 1960 | { |
1961 | if (TREE_PUBLIC (newdecl)) | |
3cf8b391 | 1962 | error ("non-static declaration of %q+D follows " |
1963 | "static declaration", newdecl); | |
679bf177 | 1964 | else |
3cf8b391 | 1965 | error ("static declaration of %q+D follows " |
1966 | "non-static declaration", newdecl); | |
679bf177 | 1967 | |
a52d5726 | 1968 | locate_old_decl (olddecl); |
679bf177 | 1969 | return false; |
51ef3909 | 1970 | } |
1971 | } | |
679bf177 | 1972 | /* Two objects with the same name declared at the same block |
1973 | scope must both be external references (6.7p3). */ | |
f23d7b7f | 1974 | else if (!DECL_FILE_SCOPE_P (newdecl)) |
679bf177 | 1975 | { |
1976 | if (DECL_EXTERNAL (newdecl)) | |
606a02e3 | 1977 | { |
1978 | /* Extern with initializer at block scope, which will | |
1979 | already have received an error. */ | |
1980 | } | |
679bf177 | 1981 | else if (DECL_EXTERNAL (olddecl)) |
606a02e3 | 1982 | { |
3cf8b391 | 1983 | error ("declaration of %q+D with no linkage follows " |
1984 | "extern declaration", newdecl); | |
a52d5726 | 1985 | locate_old_decl (olddecl); |
606a02e3 | 1986 | } |
679bf177 | 1987 | else |
606a02e3 | 1988 | { |
3cf8b391 | 1989 | error ("redeclaration of %q+D with no linkage", newdecl); |
a52d5726 | 1990 | locate_old_decl (olddecl); |
606a02e3 | 1991 | } |
5389807a | 1992 | |
679bf177 | 1993 | return false; |
1994 | } | |
b91bd472 | 1995 | |
1996 | /* C++ does not permit a decl to appear multiple times at file | |
1997 | scope. */ | |
1998 | if (warn_cxx_compat | |
1999 | && DECL_FILE_SCOPE_P (newdecl) | |
2000 | && !DECL_EXTERNAL (newdecl) | |
2001 | && !DECL_EXTERNAL (olddecl)) | |
2002 | warned |= warning_at (DECL_SOURCE_LOCATION (newdecl), | |
2003 | OPT_Wc___compat, | |
2004 | ("duplicate declaration of %qD is " | |
2005 | "invalid in C++"), | |
2006 | newdecl); | |
1806a3da | 2007 | } |
679bf177 | 2008 | |
2009 | /* warnings */ | |
b212f378 | 2010 | /* All decls must agree on a visibility. */ |
a0c938f0 | 2011 | if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS) |
5ded8c6f | 2012 | && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl) |
679bf177 | 2013 | && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl)) |
1806a3da | 2014 | { |
a52d5726 | 2015 | warned |= warning (0, "redeclaration of %q+D with different visibility " |
2016 | "(old visibility preserved)", newdecl); | |
1806a3da | 2017 | } |
679bf177 | 2018 | |
2019 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
51ef3909 | 2020 | { |
679bf177 | 2021 | /* Diagnose inline __attribute__ ((noinline)) which is silly. */ |
2022 | if (DECL_DECLARED_INLINE_P (newdecl) | |
2023 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl))) | |
51ef3909 | 2024 | { |
a52d5726 | 2025 | warned |= warning (OPT_Wattributes, |
2026 | "inline declaration of %qD follows " | |
2027 | "declaration with attribute noinline", newdecl); | |
51ef3909 | 2028 | } |
679bf177 | 2029 | else if (DECL_DECLARED_INLINE_P (olddecl) |
2030 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl))) | |
1f0395c4 | 2031 | { |
a52d5726 | 2032 | warned |= warning (OPT_Wattributes, |
2033 | "declaration of %q+D with attribute " | |
2034 | "noinline follows inline declaration ", newdecl); | |
1f0395c4 | 2035 | } |
679bf177 | 2036 | } |
93d30214 | 2037 | else /* PARM_DECL, VAR_DECL */ |
679bf177 | 2038 | { |
393b349a | 2039 | /* Redeclaration of a parameter is a constraint violation (this is |
2040 | not explicitly stated, but follows from C99 6.7p3 [no more than | |
2041 | one declaration of the same identifier with no linkage in the | |
2042 | same scope, except type tags] and 6.2.2p6 [parameters have no | |
2043 | linkage]). We must check for a forward parameter declaration, | |
2044 | indicated by TREE_ASM_WRITTEN on the old declaration - this is | |
2045 | an extension, the mandatory diagnostic for which is handled by | |
2046 | mark_forward_parm_decls. */ | |
2047 | ||
93d30214 | 2048 | if (TREE_CODE (newdecl) == PARM_DECL |
2049 | && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl))) | |
2050 | { | |
3cf8b391 | 2051 | error ("redefinition of parameter %q+D", newdecl); |
a52d5726 | 2052 | locate_old_decl (olddecl); |
93d30214 | 2053 | return false; |
2054 | } | |
51ef3909 | 2055 | } |
2056 | ||
679bf177 | 2057 | /* Optional warning for completely redundant decls. */ |
2058 | if (!warned && !pedwarned | |
2059 | && warn_redundant_decls | |
2060 | /* Don't warn about a function declaration followed by a | |
2061 | definition. */ | |
93d30214 | 2062 | && !(TREE_CODE (newdecl) == FUNCTION_DECL |
2063 | && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)) | |
fbf0afd1 | 2064 | /* Don't warn about redundant redeclarations of builtins. */ |
18eb56cd | 2065 | && !(TREE_CODE (newdecl) == FUNCTION_DECL |
2066 | && !DECL_BUILT_IN (newdecl) | |
2067 | && DECL_BUILT_IN (olddecl) | |
2068 | && !C_DECL_DECLARED_BUILTIN (olddecl)) | |
93d30214 | 2069 | /* Don't warn about an extern followed by a definition. */ |
2070 | && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl)) | |
2071 | /* Don't warn about forward parameter decls. */ | |
2072 | && !(TREE_CODE (newdecl) == PARM_DECL | |
f5963a54 | 2073 | && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)) |
2074 | /* Don't warn about a variable definition following a declaration. */ | |
2075 | && !(TREE_CODE (newdecl) == VAR_DECL | |
2076 | && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))) | |
ca9d77da | 2077 | { |
a52d5726 | 2078 | warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D", |
2079 | newdecl); | |
ca9d77da | 2080 | } |
2081 | ||
a52d5726 | 2082 | /* Report location of previous decl/defn. */ |
679bf177 | 2083 | if (warned || pedwarned) |
a52d5726 | 2084 | locate_old_decl (olddecl); |
68547c04 | 2085 | |
c195b9ad | 2086 | #undef DECL_EXTERN_INLINE |
2087 | ||
67be63e6 | 2088 | return retval; |
679bf177 | 2089 | } |
51ef3909 | 2090 | |
679bf177 | 2091 | /* Subroutine of duplicate_decls. NEWDECL has been found to be |
2092 | consistent with OLDDECL, but carries new information. Merge the | |
b41346d4 | 2093 | new information into OLDDECL. This function issues no |
679bf177 | 2094 | diagnostics. */ |
2095 | ||
2096 | static void | |
b41346d4 | 2097 | merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype) |
679bf177 | 2098 | { |
c42cc79e | 2099 | bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL |
2100 | && DECL_INITIAL (newdecl) != 0); | |
2101 | bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL | |
2102 | && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0); | |
2103 | bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL | |
2104 | && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0); | |
2105 | bool extern_changed = false; | |
679bf177 | 2106 | |
393b349a | 2107 | /* For real parm decl following a forward decl, rechain the old decl |
2108 | in its new location and clear TREE_ASM_WRITTEN (it's not a | |
2109 | forward decl anymore). */ | |
679bf177 | 2110 | if (TREE_CODE (newdecl) == PARM_DECL |
84166705 | 2111 | && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)) |
51ef3909 | 2112 | { |
393b349a | 2113 | struct c_binding *b, **here; |
2114 | ||
2115 | for (here = ¤t_scope->bindings; *here; here = &(*here)->prev) | |
2116 | if ((*here)->decl == olddecl) | |
2117 | goto found; | |
231bd014 | 2118 | gcc_unreachable (); |
393b349a | 2119 | |
2120 | found: | |
2121 | b = *here; | |
2122 | *here = b->prev; | |
2123 | b->prev = current_scope->bindings; | |
2124 | current_scope->bindings = b; | |
2125 | ||
679bf177 | 2126 | TREE_ASM_WRITTEN (olddecl) = 0; |
679bf177 | 2127 | } |
2128 | ||
2129 | DECL_ATTRIBUTES (newdecl) | |
883b2e73 | 2130 | = targetm.merge_decl_attributes (olddecl, newdecl); |
b33f0698 | 2131 | |
679bf177 | 2132 | /* Merge the data types specified in the two decls. */ |
b41346d4 | 2133 | TREE_TYPE (newdecl) |
2134 | = TREE_TYPE (olddecl) | |
1ea7fa60 | 2135 | = composite_type (newtype, oldtype); |
51ef3909 | 2136 | |
679bf177 | 2137 | /* Lay the type out, unless already done. */ |
dd078265 | 2138 | if (!comptypes (oldtype, TREE_TYPE (newdecl))) |
679bf177 | 2139 | { |
2140 | if (TREE_TYPE (newdecl) != error_mark_node) | |
2141 | layout_type (TREE_TYPE (newdecl)); | |
2142 | if (TREE_CODE (newdecl) != FUNCTION_DECL | |
2143 | && TREE_CODE (newdecl) != TYPE_DECL | |
2144 | && TREE_CODE (newdecl) != CONST_DECL) | |
2145 | layout_decl (newdecl, 0); | |
2146 | } | |
2147 | else | |
2148 | { | |
2149 | /* Since the type is OLDDECL's, make OLDDECL's size go with. */ | |
2150 | DECL_SIZE (newdecl) = DECL_SIZE (olddecl); | |
2151 | DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl); | |
2152 | DECL_MODE (newdecl) = DECL_MODE (olddecl); | |
097b5c8b | 2153 | if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl)) |
2154 | { | |
2155 | DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl); | |
5f398d1f | 2156 | DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl); |
097b5c8b | 2157 | } |
679bf177 | 2158 | } |
2af4bc7b | 2159 | |
54d7a10c | 2160 | /* Keep the old rtl since we can safely use it. */ |
2161 | if (HAS_RTL_P (olddecl)) | |
2162 | COPY_DECL_RTL (olddecl, newdecl); | |
b8e0d419 | 2163 | |
679bf177 | 2164 | /* Merge the type qualifiers. */ |
2165 | if (TREE_READONLY (newdecl)) | |
b41346d4 | 2166 | TREE_READONLY (olddecl) = 1; |
50333348 | 2167 | |
679bf177 | 2168 | if (TREE_THIS_VOLATILE (newdecl)) |
ebef29eb | 2169 | TREE_THIS_VOLATILE (olddecl) = 1; |
679bf177 | 2170 | |
df4d0ece | 2171 | /* Merge deprecatedness. */ |
2172 | if (TREE_DEPRECATED (newdecl)) | |
2173 | TREE_DEPRECATED (olddecl) = 1; | |
2174 | ||
6a1a89a6 | 2175 | /* If a decl is in a system header and the other isn't, keep the one on the |
2176 | system header. Otherwise, keep source location of definition rather than | |
2177 | declaration and of prototype rather than non-prototype unless that | |
2178 | prototype is built-in. */ | |
2179 | if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS) | |
2180 | && DECL_IN_SYSTEM_HEADER (olddecl) | |
2181 | && !DECL_IN_SYSTEM_HEADER (newdecl) ) | |
bdbc474b | 2182 | DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl); |
6a1a89a6 | 2183 | else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS) |
2184 | && DECL_IN_SYSTEM_HEADER (newdecl) | |
2185 | && !DECL_IN_SYSTEM_HEADER (olddecl)) | |
bdbc474b | 2186 | DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl); |
6a1a89a6 | 2187 | else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0) |
2188 | || (old_is_prototype && !new_is_prototype | |
2189 | && !C_DECL_BUILTIN_PROTOTYPE (olddecl))) | |
679bf177 | 2190 | DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl); |
2191 | ||
679bf177 | 2192 | /* Merge the initialization information. */ |
b41346d4 | 2193 | if (DECL_INITIAL (newdecl) == 0) |
679bf177 | 2194 | DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl); |
2195 | ||
1e8e9920 | 2196 | /* Merge the threadprivate attribute. */ |
2197 | if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl)) | |
2198 | { | |
2199 | DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl); | |
2200 | C_DECL_THREADPRIVATE_P (newdecl) = 1; | |
2201 | } | |
2202 | ||
098b24b8 | 2203 | if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)) |
2204 | { | |
098b24b8 | 2205 | /* Merge the section attribute. |
2206 | We want to issue an error if the sections conflict but that | |
2207 | must be done later in decl_attributes since we are called | |
2208 | before attributes are assigned. */ | |
2209 | if (DECL_SECTION_NAME (newdecl) == NULL_TREE) | |
2210 | DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl); | |
2211 | ||
2212 | /* Copy the assembler name. | |
2213 | Currently, it can only be defined in the prototype. */ | |
2214 | COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl); | |
2215 | ||
2216 | /* Use visibility of whichever declaration had it specified */ | |
2217 | if (DECL_VISIBILITY_SPECIFIED (olddecl)) | |
2218 | { | |
2219 | DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl); | |
2220 | DECL_VISIBILITY_SPECIFIED (newdecl) = 1; | |
2221 | } | |
2222 | ||
2223 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2224 | { | |
2225 | DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl); | |
2226 | DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl); | |
2227 | DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl); | |
2228 | DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl) | |
2229 | |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl); | |
2230 | TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl); | |
098b24b8 | 2231 | DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl); |
68d6de5b | 2232 | DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl); |
9c2a0c05 | 2233 | TREE_READONLY (newdecl) |= TREE_READONLY (olddecl); |
2234 | DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl); | |
098b24b8 | 2235 | DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl); |
2236 | } | |
2237 | ||
2238 | /* Merge the storage class information. */ | |
2239 | merge_weak (newdecl, olddecl); | |
2240 | ||
2241 | /* For functions, static overrides non-static. */ | |
2242 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2243 | { | |
2244 | TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl); | |
2245 | /* This is since we don't automatically | |
2246 | copy the attributes of NEWDECL into OLDDECL. */ | |
2247 | TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl); | |
2248 | /* If this clears `static', clear it in the identifier too. */ | |
2249 | if (!TREE_PUBLIC (olddecl)) | |
2250 | TREE_PUBLIC (DECL_NAME (olddecl)) = 0; | |
2251 | } | |
2252 | } | |
2253 | ||
541e4101 | 2254 | /* In c99, 'extern' declaration before (or after) 'inline' means this |
2255 | function is not DECL_EXTERNAL, unless 'gnu_inline' attribute | |
2256 | is present. */ | |
2257 | if (TREE_CODE (newdecl) == FUNCTION_DECL | |
11950bdd | 2258 | && !flag_gnu89_inline |
541e4101 | 2259 | && (DECL_DECLARED_INLINE_P (newdecl) |
2260 | || DECL_DECLARED_INLINE_P (olddecl)) | |
2261 | && (!DECL_DECLARED_INLINE_P (newdecl) | |
2262 | || !DECL_DECLARED_INLINE_P (olddecl) | |
2263 | || !DECL_EXTERNAL (olddecl)) | |
2264 | && DECL_EXTERNAL (newdecl) | |
56f06eef | 2265 | && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl)) |
4d6b6a7f | 2266 | && !current_function_decl) |
541e4101 | 2267 | DECL_EXTERNAL (newdecl) = 0; |
c42cc79e | 2268 | |
098b24b8 | 2269 | if (DECL_EXTERNAL (newdecl)) |
2270 | { | |
2271 | TREE_STATIC (newdecl) = TREE_STATIC (olddecl); | |
2272 | DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl); | |
2273 | ||
2274 | /* An extern decl does not override previous storage class. */ | |
2275 | TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl); | |
2276 | if (!DECL_EXTERNAL (newdecl)) | |
2277 | { | |
2278 | DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl); | |
2279 | DECL_COMMON (newdecl) = DECL_COMMON (olddecl); | |
2280 | } | |
2281 | } | |
2282 | else | |
2283 | { | |
2284 | TREE_STATIC (olddecl) = TREE_STATIC (newdecl); | |
2285 | TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl); | |
2286 | } | |
2287 | ||
2288 | if (TREE_CODE (newdecl) == FUNCTION_DECL) | |
2289 | { | |
2290 | /* If we're redefining a function previously defined as extern | |
2291 | inline, make sure we emit debug info for the inline before we | |
2292 | throw it away, in case it was inlined into a function that | |
2293 | hasn't been written out yet. */ | |
2294 | if (new_is_definition && DECL_INITIAL (olddecl)) | |
bef7f001 | 2295 | /* The new defn must not be inline. */ |
2296 | DECL_UNINLINABLE (newdecl) = 1; | |
098b24b8 | 2297 | else |
2298 | { | |
2299 | /* If either decl says `inline', this fn is inline, unless | |
2300 | its definition was passed already. */ | |
2301 | if (DECL_DECLARED_INLINE_P (newdecl) | |
2302 | || DECL_DECLARED_INLINE_P (olddecl)) | |
2303 | DECL_DECLARED_INLINE_P (newdecl) = 1; | |
2304 | ||
2305 | DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl) | |
2306 | = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)); | |
ebb7d626 | 2307 | |
2308 | DECL_DISREGARD_INLINE_LIMITS (newdecl) | |
2309 | = DECL_DISREGARD_INLINE_LIMITS (olddecl) | |
2310 | = (DECL_DISREGARD_INLINE_LIMITS (newdecl) | |
2311 | || DECL_DISREGARD_INLINE_LIMITS (olddecl)); | |
098b24b8 | 2312 | } |
2313 | ||
2314 | if (DECL_BUILT_IN (olddecl)) | |
2315 | { | |
2316 | /* If redeclaring a builtin function, it stays built in. | |
2317 | But it gets tagged as having been declared. */ | |
2318 | DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl); | |
2319 | DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl); | |
2320 | C_DECL_DECLARED_BUILTIN (newdecl) = 1; | |
2321 | if (new_is_prototype) | |
2322 | C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0; | |
2323 | else | |
2324 | C_DECL_BUILTIN_PROTOTYPE (newdecl) | |
2325 | = C_DECL_BUILTIN_PROTOTYPE (olddecl); | |
2326 | } | |
2327 | ||
46f8e3b0 | 2328 | /* Preserve function specific target and optimization options */ |
2329 | if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl) | |
2330 | && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl)) | |
2331 | DECL_FUNCTION_SPECIFIC_TARGET (newdecl) | |
2332 | = DECL_FUNCTION_SPECIFIC_TARGET (olddecl); | |
2333 | ||
2334 | if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl) | |
2335 | && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)) | |
2336 | DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl) | |
2337 | = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl); | |
2338 | ||
098b24b8 | 2339 | /* Also preserve various other info from the definition. */ |
2340 | if (!new_is_definition) | |
2341 | { | |
14bd221c | 2342 | tree t; |
098b24b8 | 2343 | DECL_RESULT (newdecl) = DECL_RESULT (olddecl); |
2344 | DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl); | |
2345 | DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl); | |
2346 | DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl); | |
75a70cf9 | 2347 | gimple_set_body (newdecl, gimple_body (olddecl)); |
14bd221c | 2348 | DECL_ARGUMENTS (newdecl) = copy_list (DECL_ARGUMENTS (olddecl)); |
2349 | for (t = DECL_ARGUMENTS (newdecl); t ; t = TREE_CHAIN (t)) | |
2350 | DECL_CONTEXT (t) = newdecl; | |
098b24b8 | 2351 | |
81549c4d | 2352 | /* See if we've got a function to instantiate from. */ |
2353 | if (DECL_SAVED_TREE (olddecl)) | |
2354 | DECL_ABSTRACT_ORIGIN (newdecl) | |
2355 | = DECL_ABSTRACT_ORIGIN (olddecl); | |
098b24b8 | 2356 | } |
2357 | } | |
2358 | ||
da870dac | 2359 | extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl); |
c42cc79e | 2360 | |
da870dac | 2361 | /* Merge the USED information. */ |
2362 | if (TREE_USED (olddecl)) | |
2363 | TREE_USED (newdecl) = 1; | |
2364 | else if (TREE_USED (newdecl)) | |
2365 | TREE_USED (olddecl) = 1; | |
f901d289 | 2366 | |
098b24b8 | 2367 | /* Copy most of the decl-specific fields of NEWDECL into OLDDECL. |
b3e83e1e | 2368 | But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */ |
41a7cb9f | 2369 | { |
19cb6b50 | 2370 | unsigned olddecl_uid = DECL_UID (olddecl); |
b3e83e1e | 2371 | tree olddecl_context = DECL_CONTEXT (olddecl); |
14bd221c | 2372 | tree olddecl_arguments = NULL; |
2373 | if (TREE_CODE (olddecl) == FUNCTION_DECL) | |
2374 | olddecl_arguments = DECL_ARGUMENTS (olddecl); | |
a0c938f0 | 2375 | |
d5130039 | 2376 | memcpy ((char *) olddecl + sizeof (struct tree_common), |
2377 | (char *) newdecl + sizeof (struct tree_common), | |
5ded8c6f | 2378 | sizeof (struct tree_decl_common) - sizeof (struct tree_common)); |
2379 | switch (TREE_CODE (olddecl)) | |
2380 | { | |
75a70cf9 | 2381 | case FUNCTION_DECL: |
2382 | gimple_set_body (olddecl, gimple_body (newdecl)); | |
2383 | /* fall through */ | |
2384 | ||
5ded8c6f | 2385 | case FIELD_DECL: |
2386 | case VAR_DECL: | |
2387 | case PARM_DECL: | |
2388 | case LABEL_DECL: | |
2389 | case RESULT_DECL: | |
2390 | case CONST_DECL: | |
2391 | case TYPE_DECL: | |
5ded8c6f | 2392 | memcpy ((char *) olddecl + sizeof (struct tree_decl_common), |
2393 | (char *) newdecl + sizeof (struct tree_decl_common), | |
2394 | tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common)); | |
2395 | break; | |
2396 | ||
2397 | default: | |
a0c938f0 | 2398 | |
5ded8c6f | 2399 | memcpy ((char *) olddecl + sizeof (struct tree_decl_common), |
2400 | (char *) newdecl + sizeof (struct tree_decl_common), | |
2401 | sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)); | |
2402 | } | |
41a7cb9f | 2403 | DECL_UID (olddecl) = olddecl_uid; |
b3e83e1e | 2404 | DECL_CONTEXT (olddecl) = olddecl_context; |
14bd221c | 2405 | if (TREE_CODE (olddecl) == FUNCTION_DECL) |
2406 | DECL_ARGUMENTS (olddecl) = olddecl_arguments; | |
41a7cb9f | 2407 | } |
51ef3909 | 2408 | |
979e2687 | 2409 | /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl |
2410 | so that encode_section_info has a chance to look at the new decl | |
2411 | flags and attributes. */ | |
2412 | if (DECL_RTL_SET_P (olddecl) | |
2413 | && (TREE_CODE (olddecl) == FUNCTION_DECL | |
2414 | || (TREE_CODE (olddecl) == VAR_DECL | |
2415 | && TREE_STATIC (olddecl)))) | |
b2c4af5e | 2416 | make_decl_rtl (olddecl); |
c42cc79e | 2417 | |
2418 | /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL, | |
2419 | and the definition is coming from the old version, cgraph needs | |
2420 | to be called again. */ | |
0da03d11 | 2421 | if (extern_changed && !new_is_definition |
c42cc79e | 2422 | && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl)) |
0da03d11 | 2423 | cgraph_mark_if_needed (olddecl); |
51ef3909 | 2424 | } |
2425 | ||
679bf177 | 2426 | /* Handle when a new declaration NEWDECL has the same name as an old |
2427 | one OLDDECL in the same binding contour. Prints an error message | |
2428 | if appropriate. | |
2429 | ||
2430 | If safely possible, alter OLDDECL to look like NEWDECL, and return | |
b41346d4 | 2431 | true. Otherwise, return false. */ |
679bf177 | 2432 | |
2433 | static bool | |
b41346d4 | 2434 | duplicate_decls (tree newdecl, tree olddecl) |
679bf177 | 2435 | { |
4ee9c684 | 2436 | tree newtype = NULL, oldtype = NULL; |
679bf177 | 2437 | |
2438 | if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype)) | |
8babbffa | 2439 | { |
b1a2195b | 2440 | /* Avoid `unused variable' and other warnings for OLDDECL. */ |
8babbffa | 2441 | TREE_NO_WARNING (olddecl) = 1; |
2442 | return false; | |
2443 | } | |
679bf177 | 2444 | |
b41346d4 | 2445 | merge_decls (newdecl, olddecl, newtype, oldtype); |
2446 | return true; | |
679bf177 | 2447 | } |
14338e9a | 2448 | |
679bf177 | 2449 | \f |
e85905e5 | 2450 | /* Check whether decl-node NEW_DECL shadows an existing declaration. */ |
31ddae9f | 2451 | static void |
e85905e5 | 2452 | warn_if_shadowing (tree new_decl) |
31ddae9f | 2453 | { |
393b349a | 2454 | struct c_binding *b; |
31ddae9f | 2455 | |
393b349a | 2456 | /* Shadow warnings wanted? */ |
2457 | if (!warn_shadow | |
31ddae9f | 2458 | /* No shadow warnings for internally generated vars. */ |
e85905e5 | 2459 | || DECL_IS_BUILTIN (new_decl) |
31ddae9f | 2460 | /* No shadow warnings for vars made for inlining. */ |
40c4b476 | 2461 | || DECL_FROM_INLINE (new_decl)) |
5f3cead1 | 2462 | return; |
2463 | ||
4194491a | 2464 | /* Is anything being shadowed? Invisible decls do not count. */ |
e85905e5 | 2465 | for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed) |
2466 | if (b->decl && b->decl != new_decl && !b->invisible) | |
393b349a | 2467 | { |
e85905e5 | 2468 | tree old_decl = b->decl; |
393b349a | 2469 | |
d75329f0 | 2470 | if (old_decl == error_mark_node) |
2471 | { | |
e8d0745d | 2472 | warning (OPT_Wshadow, "declaration of %q+D shadows previous " |
2473 | "non-variable", new_decl); | |
d75329f0 | 2474 | break; |
2475 | } | |
2476 | else if (TREE_CODE (old_decl) == PARM_DECL) | |
e8d0745d | 2477 | warning (OPT_Wshadow, "declaration of %q+D shadows a parameter", |
3cf8b391 | 2478 | new_decl); |
e8d0745d | 2479 | else if (DECL_FILE_SCOPE_P (old_decl)) |
2480 | warning (OPT_Wshadow, "declaration of %q+D shadows a global " | |
2481 | "declaration", new_decl); | |
e85905e5 | 2482 | else if (TREE_CODE (old_decl) == FUNCTION_DECL |
2483 | && DECL_BUILT_IN (old_decl)) | |
d75329f0 | 2484 | { |
e8d0745d | 2485 | warning (OPT_Wshadow, "declaration of %q+D shadows " |
2486 | "a built-in function", new_decl); | |
d75329f0 | 2487 | break; |
2488 | } | |
393b349a | 2489 | else |
e8d0745d | 2490 | warning (OPT_Wshadow, "declaration of %q+D shadows a previous local", |
3cf8b391 | 2491 | new_decl); |
393b349a | 2492 | |
712d2297 | 2493 | warning_at (DECL_SOURCE_LOCATION (old_decl), OPT_Wshadow, |
2494 | "shadowed declaration is here"); | |
a3ad3e27 | 2495 | |
393b349a | 2496 | break; |
2497 | } | |
31ddae9f | 2498 | } |
2499 | ||
51ef3909 | 2500 | /* Record a decl-node X as belonging to the current lexical scope. |
2501 | Check for errors (such as an incompatible declaration for the same | |
2502 | name already seen in the same scope). | |
2503 | ||
2504 | Returns either X or an old decl for the same name. | |
2505 | If an old decl is returned, it may have been smashed | |
2506 | to agree with what X says. */ | |
2507 | ||
2508 | tree | |
1cae46be | 2509 | pushdecl (tree x) |
51ef3909 | 2510 | { |
19cb6b50 | 2511 | tree name = DECL_NAME (x); |
6e899616 | 2512 | struct c_scope *scope = current_scope; |
393b349a | 2513 | struct c_binding *b; |
4194491a | 2514 | bool nested = false; |
6fb80942 | 2515 | location_t locus = DECL_SOURCE_LOCATION (x); |
51ef3909 | 2516 | |
4d714d55 | 2517 | /* Must set DECL_CONTEXT for everything not at file scope or |
2518 | DECL_FILE_SCOPE_P won't work. Local externs don't count | |
2519 | unless they have initializers (which generate code). */ | |
2520 | if (current_function_decl | |
2521 | && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL) | |
2522 | || DECL_INITIAL (x) || !DECL_EXTERNAL (x))) | |
31ddae9f | 2523 | DECL_CONTEXT (x) = current_function_decl; |
d9cf68bf | 2524 | |
393b349a | 2525 | /* Anonymous decls are just inserted in the scope. */ |
2526 | if (!name) | |
51ef3909 | 2527 | { |
6fb80942 | 2528 | bind (name, x, scope, /*invisible=*/false, /*nested=*/false, |
2529 | locus); | |
393b349a | 2530 | return x; |
2531 | } | |
2532 | ||
2533 | /* First, see if there is another declaration with the same name in | |
2534 | the current scope. If there is, duplicate_decls may do all the | |
2535 | work for us. If duplicate_decls returns false, that indicates | |
2536 | two incompatible decls in the same scope; we are to silently | |
2537 | replace the old one (duplicate_decls has issued all appropriate | |
2538 | diagnostics). In particular, we should not consider possible | |
2539 | duplicates in the external scope, or shadowing. */ | |
2540 | b = I_SYMBOL_BINDING (name); | |
4194491a | 2541 | if (b && B_IN_SCOPE (b, scope)) |
393b349a | 2542 | { |
fea849d3 | 2543 | struct c_binding *b_ext, *b_use; |
2544 | tree type = TREE_TYPE (x); | |
2545 | tree visdecl = b->decl; | |
2546 | tree vistype = TREE_TYPE (visdecl); | |
606a02e3 | 2547 | if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE |
2548 | && COMPLETE_TYPE_P (TREE_TYPE (x))) | |
2549 | b->inner_comp = false; | |
fea849d3 | 2550 | b_use = b; |
2551 | b_ext = b; | |
2552 | /* If this is an external linkage declaration, we should check | |
2553 | for compatibility with the type in the external scope before | |
2554 | setting the type at this scope based on the visible | |
2555 | information only. */ | |
2556 | if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl)) | |
2557 | { | |
2558 | while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext)) | |
2559 | b_ext = b_ext->shadowed; | |
2560 | if (b_ext) | |
2561 | { | |
2562 | b_use = b_ext; | |
f805d53d | 2563 | if (b_use->u.type) |
2564 | TREE_TYPE (b_use->decl) = b_use->u.type; | |
fea849d3 | 2565 | } |
2566 | } | |
2567 | if (duplicate_decls (x, b_use->decl)) | |
2568 | { | |
2569 | if (b_use != b) | |
2570 | { | |
2571 | /* Save the updated type in the external scope and | |
2572 | restore the proper type for this scope. */ | |
2573 | tree thistype; | |
2574 | if (comptypes (vistype, type)) | |
2575 | thistype = composite_type (vistype, type); | |
2576 | else | |
2577 | thistype = TREE_TYPE (b_use->decl); | |
f805d53d | 2578 | b_use->u.type = TREE_TYPE (b_use->decl); |
fea849d3 | 2579 | if (TREE_CODE (b_use->decl) == FUNCTION_DECL |
2580 | && DECL_BUILT_IN (b_use->decl)) | |
2581 | thistype | |
2582 | = build_type_attribute_variant (thistype, | |
2583 | TYPE_ATTRIBUTES | |
f805d53d | 2584 | (b_use->u.type)); |
fea849d3 | 2585 | TREE_TYPE (b_use->decl) = thistype; |
2586 | } | |
2587 | return b_use->decl; | |
2588 | } | |
393b349a | 2589 | else |
2590 | goto skip_external_and_shadow_checks; | |
2591 | } | |
2592 | ||
2593 | /* All declarations with external linkage, and all external | |
2594 | references, go in the external scope, no matter what scope is | |
2595 | current. However, the binding in that scope is ignored for | |
2596 | purposes of normal name lookup. A separate binding structure is | |
2597 | created in the requested scope; this governs the normal | |
2598 | visibility of the symbol. | |
51ef3909 | 2599 | |
393b349a | 2600 | The binding in the externals scope is used exclusively for |
2601 | detecting duplicate declarations of the same object, no matter | |
2602 | what scope they are in; this is what we do here. (C99 6.2.7p2: | |
2603 | All declarations that refer to the same object or function shall | |
2604 | have compatible type; otherwise, the behavior is undefined.) */ | |
2605 | if (DECL_EXTERNAL (x) || scope == file_scope) | |
2606 | { | |
606a02e3 | 2607 | tree type = TREE_TYPE (x); |
2608 | tree vistype = 0; | |
2609 | tree visdecl = 0; | |
2610 | bool type_saved = false; | |
2611 | if (b && !B_IN_EXTERNAL_SCOPE (b) | |
2612 | && (TREE_CODE (b->decl) == FUNCTION_DECL | |
2613 | || TREE_CODE (b->decl) == VAR_DECL) | |
2614 | && DECL_FILE_SCOPE_P (b->decl)) | |
2615 | { | |
2616 | visdecl = b->decl; | |
2617 | vistype = TREE_TYPE (visdecl); | |
2618 | } | |
6bf97f82 | 2619 | if (scope != file_scope |
94cb93b3 | 2620 | && !DECL_IN_SYSTEM_HEADER (x)) |
6bf97f82 | 2621 | warning (OPT_Wnested_externs, "nested extern declaration of %qD", x); |
94cb93b3 | 2622 | |
4194491a | 2623 | while (b && !B_IN_EXTERNAL_SCOPE (b)) |
606a02e3 | 2624 | { |
2625 | /* If this decl might be modified, save its type. This is | |
2626 | done here rather than when the decl is first bound | |
2627 | because the type may change after first binding, through | |
2628 | being completed or through attributes being added. If we | |
2629 | encounter multiple such decls, only the first should have | |
2630 | its type saved; the others will already have had their | |
2631 | proper types saved and the types will not have changed as | |
2632 | their scopes will not have been re-entered. */ | |
d75329f0 | 2633 | if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved) |
606a02e3 | 2634 | { |
f805d53d | 2635 | b->u.type = TREE_TYPE (b->decl); |
606a02e3 | 2636 | type_saved = true; |
2637 | } | |
2638 | if (B_IN_FILE_SCOPE (b) | |
2639 | && TREE_CODE (b->decl) == VAR_DECL | |
2640 | && TREE_STATIC (b->decl) | |
2641 | && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE | |
2642 | && !TYPE_DOMAIN (TREE_TYPE (b->decl)) | |
2643 | && TREE_CODE (type) == ARRAY_TYPE | |
2644 | && TYPE_DOMAIN (type) | |
2645 | && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) | |
2646 | && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type)))) | |
2647 | { | |
2648 | /* Array type completed in inner scope, which should be | |
2649 | diagnosed if the completion does not have size 1 and | |
2650 | it does not get completed in the file scope. */ | |
2651 | b->inner_comp = true; | |
2652 | } | |
2653 | b = b->shadowed; | |
2654 | } | |
2655 | ||
2656 | /* If a matching external declaration has been found, set its | |
2657 | type to the composite of all the types of that declaration. | |
2658 | After the consistency checks, it will be reset to the | |
2659 | composite of the visible types only. */ | |
2660 | if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl)) | |
f805d53d | 2661 | && b->u.type) |
2662 | TREE_TYPE (b->decl) = b->u.type; | |
393b349a | 2663 | |
2664 | /* The point of the same_translation_unit_p check here is, | |
2665 | we want to detect a duplicate decl for a construct like | |
2666 | foo() { extern bar(); } ... static bar(); but not if | |
2667 | they are in different translation units. In any case, | |
2668 | the static does not go in the externals scope. */ | |
2669 | if (b | |
b3e83e1e | 2670 | && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl)) |
393b349a | 2671 | && duplicate_decls (x, b->decl)) |
f74be9a1 | 2672 | { |
606a02e3 | 2673 | tree thistype; |
fea849d3 | 2674 | if (vistype) |
2675 | { | |
2676 | if (comptypes (vistype, type)) | |
2677 | thistype = composite_type (vistype, type); | |
2678 | else | |
2679 | thistype = TREE_TYPE (b->decl); | |
2680 | } | |
2681 | else | |
2682 | thistype = type; | |
f805d53d | 2683 | b->u.type = TREE_TYPE (b->decl); |
606a02e3 | 2684 | if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl)) |
2685 | thistype | |
2686 | = build_type_attribute_variant (thistype, | |
f805d53d | 2687 | TYPE_ATTRIBUTES (b->u.type)); |
606a02e3 | 2688 | TREE_TYPE (b->decl) = thistype; |
6fb80942 | 2689 | bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true, |
2690 | locus); | |
393b349a | 2691 | return b->decl; |
f74be9a1 | 2692 | } |
b3e83e1e | 2693 | else if (TREE_PUBLIC (x)) |
4214af46 | 2694 | { |
606a02e3 | 2695 | if (visdecl && !b && duplicate_decls (x, visdecl)) |
2696 | { | |
2697 | /* An external declaration at block scope referring to a | |
2698 | visible entity with internal linkage. The composite | |
2699 | type will already be correct for this scope, so we | |
2700 | just need to fall through to make the declaration in | |
2701 | this scope. */ | |
2702 | nested = true; | |
2d7a881f | 2703 | x = visdecl; |
606a02e3 | 2704 | } |
2705 | else | |
2706 | { | |
2707 | bind (name, x, external_scope, /*invisible=*/true, | |
6fb80942 | 2708 | /*nested=*/false, locus); |
606a02e3 | 2709 | nested = true; |
2710 | } | |
51ef3909 | 2711 | } |
393b349a | 2712 | } |
1cae46be | 2713 | |
40c4b476 | 2714 | if (TREE_CODE (x) != PARM_DECL) |
2715 | warn_if_shadowing (x); | |
51ef3909 | 2716 | |
393b349a | 2717 | skip_external_and_shadow_checks: |
2718 | if (TREE_CODE (x) == TYPE_DECL) | |
41771881 | 2719 | set_underlying_type (x); |
51ef3909 | 2720 | |
6fb80942 | 2721 | bind (name, x, scope, /*invisible=*/false, nested, locus); |
393b349a | 2722 | |
2723 | /* If x's type is incomplete because it's based on a | |
2724 | structure or union which has not yet been fully declared, | |
2725 | attach it to that structure or union type, so we can go | |
2726 | back and complete the variable declaration later, if the | |
2727 | structure or union gets fully declared. | |
51ef3909 | 2728 | |
393b349a | 2729 | If the input is erroneous, we can have error_mark in the type |
2730 | slot (e.g. "f(void a, ...)") - that doesn't count as an | |
2731 | incomplete type. */ | |
2732 | if (TREE_TYPE (x) != error_mark_node | |
2733 | && !COMPLETE_TYPE_P (TREE_TYPE (x))) | |
2734 | { | |
2735 | tree element = TREE_TYPE (x); | |
2736 | ||
2737 | while (TREE_CODE (element) == ARRAY_TYPE) | |
2738 | element = TREE_TYPE (element); | |
2739 | element = TYPE_MAIN_VARIANT (element); | |
2740 | ||
2741 | if ((TREE_CODE (element) == RECORD_TYPE | |
2742 | || TREE_CODE (element) == UNION_TYPE) | |
2743 | && (TREE_CODE (x) != TYPE_DECL | |
2744 | || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE) | |
2745 | && !COMPLETE_TYPE_P (element)) | |
2746 | C_TYPE_INCOMPLETE_VARS (element) | |
2747 | = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element)); | |
2748 | } | |
51ef3909 | 2749 | return x; |
2750 | } | |
2751 | ||
393b349a | 2752 | /* Record X as belonging to file scope. |
7ef5b942 | 2753 | This is used only internally by the Objective-C front end, |
3bdb6310 | 2754 | and is limited to its needs. duplicate_decls is not called; |
2755 | if there is any preexisting decl for this identifier, it is an ICE. */ | |
2756 | ||
31ddae9f | 2757 | tree |
1cae46be | 2758 | pushdecl_top_level (tree x) |
4124ea8b | 2759 | { |
3bdb6310 | 2760 | tree name; |
4194491a | 2761 | bool nested = false; |
6e030094 | 2762 | gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL); |
31ddae9f | 2763 | |
2764 | name = DECL_NAME (x); | |
31ddae9f | 2765 | |
6e030094 | 2766 | gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name)); |
4124ea8b | 2767 | |
b3e83e1e | 2768 | if (TREE_PUBLIC (x)) |
393b349a | 2769 | { |
6fb80942 | 2770 | bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false, |
2771 | UNKNOWN_LOCATION); | |
4194491a | 2772 | nested = true; |
393b349a | 2773 | } |
2774 | if (file_scope) | |
6fb80942 | 2775 | bind (name, x, file_scope, /*invisible=*/false, nested, UNKNOWN_LOCATION); |
51ef3909 | 2776 | |
3bdb6310 | 2777 | return x; |
51ef3909 | 2778 | } |
2779 | \f | |
393b349a | 2780 | static void |
2781 | implicit_decl_warning (tree id, tree olddecl) | |
2782 | { | |
3ba510aa | 2783 | if (warn_implicit_function_declaration) |
393b349a | 2784 | { |
a52d5726 | 2785 | bool warned; |
2786 | ||
3ba510aa | 2787 | if (flag_isoc99) |
21ca8540 | 2788 | warned = pedwarn (input_location, OPT_Wimplicit_function_declaration, |
2789 | "implicit declaration of function %qE", id); | |
3ba510aa | 2790 | else |
a52d5726 | 2791 | warned = warning (OPT_Wimplicit_function_declaration, |
2792 | G_("implicit declaration of function %qE"), id); | |
2793 | if (olddecl && warned) | |
2794 | locate_old_decl (olddecl); | |
393b349a | 2795 | } |
393b349a | 2796 | } |
2797 | ||
e60a6f7b | 2798 | /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a |
31ddae9f | 2799 | function of type int (). */ |
51ef3909 | 2800 | |
2801 | tree | |
e60a6f7b | 2802 | implicitly_declare (location_t loc, tree functionid) |
51ef3909 | 2803 | { |
606a02e3 | 2804 | struct c_binding *b; |
2805 | tree decl = 0; | |
f3e21791 | 2806 | tree asmspec_tree; |
2807 | ||
606a02e3 | 2808 | for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed) |
2809 | { | |
2810 | if (B_IN_SCOPE (b, external_scope)) | |
2811 | { | |
2812 | decl = b->decl; | |
2813 | break; | |
2814 | } | |
2815 | } | |
51ef3909 | 2816 | |
3bdb6310 | 2817 | if (decl) |
31ddae9f | 2818 | { |
d75329f0 | 2819 | if (decl == error_mark_node) |
2820 | return decl; | |
2821 | ||
393b349a | 2822 | /* FIXME: Objective-C has weird not-really-builtin functions |
2823 | which are supposed to be visible automatically. They wind up | |
2824 | in the external scope because they're pushed before the file | |
2825 | scope gets created. Catch this here and rebind them into the | |
2826 | file scope. */ | |
9a6486a6 | 2827 | if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl)) |
393b349a | 2828 | { |
4194491a | 2829 | bind (functionid, decl, file_scope, |
6fb80942 | 2830 | /*invisible=*/false, /*nested=*/true, |
2831 | DECL_SOURCE_LOCATION (decl)); | |
393b349a | 2832 | return decl; |
2833 | } | |
2834 | else | |
31ddae9f | 2835 | { |
606a02e3 | 2836 | tree newtype = default_function_type; |
f805d53d | 2837 | if (b->u.type) |
2838 | TREE_TYPE (decl) = b->u.type; | |
393b349a | 2839 | /* Implicit declaration of a function already declared |
2840 | (somehow) in a different scope, or as a built-in. | |
2841 | If this is the first time this has happened, warn; | |
606a02e3 | 2842 | then recycle the old declaration but with the new type. */ |
393b349a | 2843 | if (!C_DECL_IMPLICIT (decl)) |
2844 | { | |
2845 | implicit_decl_warning (functionid, decl); | |
2846 | C_DECL_IMPLICIT (decl) = 1; | |
2847 | } | |
0568d4ea | 2848 | if (DECL_BUILT_IN (decl)) |
2849 | { | |
606a02e3 | 2850 | newtype = build_type_attribute_variant (newtype, |
2851 | TYPE_ATTRIBUTES | |
2852 | (TREE_TYPE (decl))); | |
2853 | if (!comptypes (newtype, TREE_TYPE (decl))) | |
0568d4ea | 2854 | { |
e60a6f7b | 2855 | warning_at (loc, 0, "incompatible implicit declaration of " |
2856 | "built-in function %qD", decl); | |
606a02e3 | 2857 | newtype = TREE_TYPE (decl); |
0568d4ea | 2858 | } |
2859 | } | |
2860 | else | |
2861 | { | |
606a02e3 | 2862 | if (!comptypes (newtype, TREE_TYPE (decl))) |
0568d4ea | 2863 | { |
e60a6f7b | 2864 | error_at (loc, "incompatible implicit declaration of function %qD", decl); |
a52d5726 | 2865 | locate_old_decl (decl); |
0568d4ea | 2866 | } |
2867 | } | |
f805d53d | 2868 | b->u.type = TREE_TYPE (decl); |
606a02e3 | 2869 | TREE_TYPE (decl) = newtype; |
4194491a | 2870 | bind (functionid, decl, current_scope, |
6fb80942 | 2871 | /*invisible=*/false, /*nested=*/true, |
2872 | DECL_SOURCE_LOCATION (decl)); | |
393b349a | 2873 | return decl; |
31ddae9f | 2874 | } |
31ddae9f | 2875 | } |
51ef3909 | 2876 | |
31ddae9f | 2877 | /* Not seen before. */ |
e60a6f7b | 2878 | decl = build_decl (loc, FUNCTION_DECL, functionid, default_function_type); |
5e58c22e | 2879 | DECL_EXTERNAL (decl) = 1; |
51ef3909 | 2880 | TREE_PUBLIC (decl) = 1; |
31ddae9f | 2881 | C_DECL_IMPLICIT (decl) = 1; |
393b349a | 2882 | implicit_decl_warning (functionid, 0); |
f3e21791 | 2883 | asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL); |
2884 | if (asmspec_tree) | |
2885 | set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree)); | |
51ef3909 | 2886 | |
b3924a2c | 2887 | /* C89 says implicit declarations are in the innermost block. |
455730ef | 2888 | So we record the decl in the standard fashion. */ |
31ddae9f | 2889 | decl = pushdecl (decl); |
51ef3909 | 2890 | |
31ddae9f | 2891 | /* No need to call objc_check_decl here - it's a function type. */ |
b2c4af5e | 2892 | rest_of_decl_compilation (decl, 0, 0); |
51ef3909 | 2893 | |
b3924a2c | 2894 | /* Write a record describing this implicit function declaration |
2895 | to the prototypes file (if requested). */ | |
51ef3909 | 2896 | gen_aux_info_record (decl, 0, 1, 0); |
2897 | ||
7d3b509a | 2898 | /* Possibly apply some default attributes to this implicit declaration. */ |
2899 | decl_attributes (&decl, NULL_TREE, 0); | |
2900 | ||
51ef3909 | 2901 | return decl; |
2902 | } | |
2903 | ||
a0c21e2b | 2904 | /* Issue an error message for a reference to an undeclared variable |
2905 | ID, including a reference to a builtin outside of function-call | |
2906 | context. Establish a binding of the identifier to error_mark_node | |
2907 | in an appropriate scope, which will suppress further errors for the | |
8dc938b9 | 2908 | same identifier. The error message should be given location LOC. */ |
a0c21e2b | 2909 | void |
e60a6f7b | 2910 | undeclared_variable (location_t loc, tree id) |
a0c21e2b | 2911 | { |
2912 | static bool already = false; | |
3bdb6310 | 2913 | struct c_scope *scope; |
a0c21e2b | 2914 | |
2915 | if (current_function_decl == 0) | |
2916 | { | |
5fb6a912 | 2917 | error_at (loc, "%qE undeclared here (not in a function)", id); |
3bdb6310 | 2918 | scope = current_scope; |
a0c21e2b | 2919 | } |
2920 | else | |
2921 | { | |
5fb6a912 | 2922 | error_at (loc, "%qE undeclared (first use in this function)", id); |
a0c21e2b | 2923 | |
84166705 | 2924 | if (!already) |
a0c21e2b | 2925 | { |
5fb6a912 | 2926 | error_at (loc, "(Each undeclared identifier is reported only once"); |
2927 | error_at (loc, "for each function it appears in.)"); | |
a0c21e2b | 2928 | already = true; |
2929 | } | |
2930 | ||
393b349a | 2931 | /* If we are parsing old-style parameter decls, current_function_decl |
a0c938f0 | 2932 | will be nonnull but current_function_scope will be null. */ |
393b349a | 2933 | scope = current_function_scope ? current_function_scope : current_scope; |
a0c21e2b | 2934 | } |
6fb80942 | 2935 | bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false, |
2936 | UNKNOWN_LOCATION); | |
a0c21e2b | 2937 | } |
51ef3909 | 2938 | \f |
bdc33d98 | 2939 | /* Subroutine of lookup_label, declare_label, define_label: construct a |
f805d53d | 2940 | LABEL_DECL with all the proper frills. Also create a struct |
2941 | c_label_vars initialized for the current scope. */ | |
bdc33d98 | 2942 | |
2943 | static tree | |
f805d53d | 2944 | make_label (location_t location, tree name, bool defining, |
2945 | struct c_label_vars **p_label_vars) | |
bdc33d98 | 2946 | { |
e60a6f7b | 2947 | tree label = build_decl (location, LABEL_DECL, name, void_type_node); |
f805d53d | 2948 | struct c_label_vars *label_vars; |
bdc33d98 | 2949 | |
2950 | DECL_CONTEXT (label) = current_function_decl; | |
2951 | DECL_MODE (label) = VOIDmode; | |
bdc33d98 | 2952 | |
f805d53d | 2953 | label_vars = GGC_NEW (struct c_label_vars); |
2954 | label_vars->shadowed = NULL; | |
2955 | set_spot_bindings (&label_vars->label_bindings, defining); | |
2956 | label_vars->decls_in_scope = make_tree_vector (); | |
2957 | label_vars->gotos = VEC_alloc (c_goto_bindings_p, gc, 0); | |
2958 | *p_label_vars = label_vars; | |
2959 | ||
bdc33d98 | 2960 | return label; |
2961 | } | |
2962 | ||
bdc33d98 | 2963 | /* Get the LABEL_DECL corresponding to identifier NAME as a label. |
51ef3909 | 2964 | Create one if none exists so far for the current function. |
bdc33d98 | 2965 | This is called when a label is used in a goto expression or |
2966 | has its address taken. */ | |
51ef3909 | 2967 | |
2968 | tree | |
bdc33d98 | 2969 | lookup_label (tree name) |
51ef3909 | 2970 | { |
bdc33d98 | 2971 | tree label; |
f805d53d | 2972 | struct c_label_vars *label_vars; |
51ef3909 | 2973 | |
dc5e019a | 2974 | if (current_function_decl == 0) |
2975 | { | |
782858b8 | 2976 | error ("label %qE referenced outside of any function", name); |
dc5e019a | 2977 | return 0; |
2978 | } | |
2979 | ||
bdc33d98 | 2980 | /* Use a label already defined or ref'd with this name, but not if |
2981 | it is inherited from a containing function and wasn't declared | |
2982 | using __label__. */ | |
393b349a | 2983 | label = I_LABEL_DECL (name); |
bdc33d98 | 2984 | if (label && (DECL_CONTEXT (label) == current_function_decl |
2985 | || C_DECLARED_LABEL_FLAG (label))) | |
51ef3909 | 2986 | { |
bdc33d98 | 2987 | /* If the label has only been declared, update its apparent |
2988 | location to point here, for better diagnostics if it | |
2989 | turns out not to have been defined. */ | |
f805d53d | 2990 | if (DECL_INITIAL (label) == NULL_TREE) |
346064d9 | 2991 | DECL_SOURCE_LOCATION (label) = input_location; |
bdc33d98 | 2992 | return label; |
51ef3909 | 2993 | } |
2994 | ||
bdc33d98 | 2995 | /* No label binding for that identifier; make one. */ |
f805d53d | 2996 | label = make_label (input_location, name, false, &label_vars); |
51ef3909 | 2997 | |
b3924a2c | 2998 | /* Ordinary labels go in the current function scope. */ |
f805d53d | 2999 | bind_label (name, label, current_function_scope, label_vars); |
3000 | ||
3001 | return label; | |
3002 | } | |
3003 | ||
3004 | /* Issue a warning about DECL for a goto statement at GOTO_LOC going | |
3005 | to LABEL. */ | |
3006 | ||
3007 | static void | |
3008 | warn_about_goto (location_t goto_loc, tree label, tree decl) | |
3009 | { | |
3010 | if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) | |
3011 | error_at (goto_loc, | |
3012 | "jump into scope of identifier with variably modified type"); | |
3013 | else | |
3014 | warning_at (goto_loc, OPT_Wjump_misses_init, | |
3015 | "jump skips variable initialization"); | |
3016 | inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label); | |
3017 | inform (DECL_SOURCE_LOCATION (decl), "%qD declared here", decl); | |
3018 | } | |
3019 | ||
3020 | /* Look up a label because of a goto statement. This is like | |
3021 | lookup_label, but also issues any appropriate warnings. */ | |
3022 | ||
3023 | tree | |
3024 | lookup_label_for_goto (location_t loc, tree name) | |
3025 | { | |
3026 | tree label; | |
3027 | struct c_label_vars *label_vars; | |
3028 | unsigned int ix; | |
3029 | tree decl; | |
3030 | ||
3031 | label = lookup_label (name); | |
3032 | if (label == NULL_TREE) | |
3033 | return NULL_TREE; | |
3034 | ||
3035 | /* If we are jumping to a different function, we can't issue any | |
3036 | useful warnings. */ | |
3037 | if (DECL_CONTEXT (label) != current_function_decl) | |
3038 | { | |
3039 | gcc_assert (C_DECLARED_LABEL_FLAG (label)); | |
3040 | return label; | |
3041 | } | |
3042 | ||
3043 | label_vars = I_LABEL_BINDING (name)->u.label; | |
3044 | ||
3045 | /* If the label has not yet been defined, then push this goto on a | |
3046 | list for possible later warnings. */ | |
3047 | if (label_vars->label_bindings.scope == NULL) | |
3048 | { | |
3049 | struct c_goto_bindings *g; | |
3050 | ||
3051 | g = GGC_NEW (struct c_goto_bindings); | |
3052 | g->loc = loc; | |
3053 | set_spot_bindings (&g->goto_bindings, true); | |
3054 | VEC_safe_push (c_goto_bindings_p, gc, label_vars->gotos, g); | |
3055 | return label; | |
3056 | } | |
3057 | ||
3058 | /* If there are any decls in label_vars->decls_in_scope, then this | |
3059 | goto has missed the declaration of the decl. This happens for a | |
3060 | case like | |
3061 | int i = 1; | |
3062 | lab: | |
3063 | ... | |
3064 | goto lab; | |
3065 | Issue a warning or error. */ | |
3066 | for (ix = 0; VEC_iterate (tree, label_vars->decls_in_scope, ix, decl); ++ix) | |
3067 | warn_about_goto (loc, label, decl); | |
3068 | ||
3069 | if (label_vars->label_bindings.left_stmt_expr) | |
3070 | { | |
3071 | error_at (loc, "jump into statement expression"); | |
3072 | inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label); | |
3073 | } | |
3074 | ||
bdc33d98 | 3075 | return label; |
51ef3909 | 3076 | } |
3077 | ||
bdc33d98 | 3078 | /* Make a label named NAME in the current function, shadowing silently |
3079 | any that may be inherited from containing functions or containing | |
3080 | scopes. This is called for __label__ declarations. */ | |
51ef3909 | 3081 | |
51ef3909 | 3082 | tree |
bdc33d98 | 3083 | declare_label (tree name) |
51ef3909 | 3084 | { |
393b349a | 3085 | struct c_binding *b = I_LABEL_BINDING (name); |
3086 | tree label; | |
f805d53d | 3087 | struct c_label_vars *label_vars; |
51ef3909 | 3088 | |
bdc33d98 | 3089 | /* Check to make sure that the label hasn't already been declared |
3090 | at this scope */ | |
4194491a | 3091 | if (b && B_IN_CURRENT_SCOPE (b)) |
393b349a | 3092 | { |
782858b8 | 3093 | error ("duplicate label declaration %qE", name); |
a52d5726 | 3094 | locate_old_decl (b->decl); |
407dc108 | 3095 | |
393b349a | 3096 | /* Just use the previous declaration. */ |
3097 | return b->decl; | |
3098 | } | |
407dc108 | 3099 | |
f805d53d | 3100 | label = make_label (input_location, name, false, &label_vars); |
bdc33d98 | 3101 | C_DECLARED_LABEL_FLAG (label) = 1; |
51ef3909 | 3102 | |
bdc33d98 | 3103 | /* Declared labels go in the current scope. */ |
f805d53d | 3104 | bind_label (name, label, current_scope, label_vars); |
3105 | ||
bdc33d98 | 3106 | return label; |
51ef3909 | 3107 | } |
3108 | ||
f805d53d | 3109 | /* When we define a label, issue any appropriate warnings if there are |
3110 | any gotos earlier in the function which jump to this label. */ | |
3111 | ||
3112 | static void | |
3113 | check_earlier_gotos (tree label, struct c_label_vars* label_vars) | |
3114 | { | |
3115 | unsigned int ix; | |
3116 | struct c_goto_bindings *g; | |
3117 | ||
3118 | for (ix = 0; | |
3119 | VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g); | |
3120 | ++ix) | |
3121 | { | |
3122 | struct c_binding *b; | |
3123 | struct c_scope *scope; | |
3124 | ||
3125 | /* We have a goto to this label. The goto is going forward. In | |
3126 | g->scope, the goto is going to skip any binding which was | |
3127 | defined after g->bindings_in_scope. */ | |
3128 | for (b = g->goto_bindings.scope->bindings; | |
3129 | b != g->goto_bindings.bindings_in_scope; | |
3130 | b = b->prev) | |
3131 | { | |
3132 | if (decl_jump_unsafe (b->decl)) | |
3133 | warn_about_goto (g->loc, label, b->decl); | |
3134 | } | |
3135 | ||
3136 | /* We also need to warn about decls defined in any scopes | |
3137 | between the scope of the label and the scope of the goto. */ | |
3138 | for (scope = label_vars->label_bindings.scope; | |
3139 | scope != g->goto_bindings.scope; | |
3140 | scope = scope->outer) | |
3141 | { | |
3142 | gcc_assert (scope != NULL); | |
3143 | if (scope == label_vars->label_bindings.scope) | |
3144 | b = label_vars->label_bindings.bindings_in_scope; | |
3145 | else | |
3146 | b = scope->bindings; | |
3147 | for (; b != NULL; b = b->prev) | |
3148 | { | |
3149 | if (decl_jump_unsafe (b->decl)) | |
3150 | warn_about_goto (g->loc, label, b->decl); | |
3151 | } | |
3152 | } | |
3153 | ||
3154 | if (g->goto_bindings.stmt_exprs > 0) | |
3155 | { | |
3156 | error_at (g->loc, "jump into statement expression"); | |
3157 | inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", | |
3158 | label); | |
3159 | } | |
3160 | } | |
3161 | ||
3162 | /* Now that the label is defined, we will issue warnings about | |
3163 | subsequent gotos to this label when we see them. */ | |
3164 | VEC_truncate (c_goto_bindings_p, label_vars->gotos, 0); | |
3165 | label_vars->gotos = NULL; | |
3166 | } | |
3167 | ||
51ef3909 | 3168 | /* Define a label, specifying the location in the source file. |
3169 | Return the LABEL_DECL node for the label, if the definition is valid. | |
3170 | Otherwise return 0. */ | |
3171 | ||
3172 | tree | |
92ddaf90 | 3173 | define_label (location_t location, tree name) |
51ef3909 | 3174 | { |
bdc33d98 | 3175 | /* Find any preexisting label with this name. It is an error |
3176 | if that label has already been defined in this function, or | |
3177 | if there is a containing function with a declared label with | |
3178 | the same name. */ | |
393b349a | 3179 | tree label = I_LABEL_DECL (name); |
bdc33d98 | 3180 | |
3181 | if (label | |
3182 | && ((DECL_CONTEXT (label) == current_function_decl | |
3183 | && DECL_INITIAL (label) != 0) | |
3184 | || (DECL_CONTEXT (label) != current_function_decl | |
3185 | && C_DECLARED_LABEL_FLAG (label)))) | |
51ef3909 | 3186 | { |
e60a6f7b | 3187 | error_at (location, "duplicate label %qD", label); |
a52d5726 | 3188 | locate_old_decl (label); |
bdc33d98 | 3189 | return 0; |
51ef3909 | 3190 | } |
bdc33d98 | 3191 | else if (label && DECL_CONTEXT (label) == current_function_decl) |
51ef3909 | 3192 | { |
f805d53d | 3193 | struct c_label_vars *label_vars = I_LABEL_BINDING (name)->u.label; |
3194 | ||
bdc33d98 | 3195 | /* The label has been used or declared already in this function, |
3196 | but not defined. Update its location to point to this | |
3197 | definition. */ | |
346064d9 | 3198 | DECL_SOURCE_LOCATION (label) = location; |
f805d53d | 3199 | set_spot_bindings (&label_vars->label_bindings, true); |
3200 | ||
3201 | /* Issue warnings as required about any goto statements from | |
3202 | earlier in the function. */ | |
3203 | check_earlier_gotos (label, label_vars); | |
51ef3909 | 3204 | } |
3205 | else | |
3206 | { | |
f805d53d | 3207 | struct c_label_vars *label_vars; |
3208 | ||
bdc33d98 | 3209 | /* No label binding for that identifier; make one. */ |
f805d53d | 3210 | label = make_label (location, name, true, &label_vars); |
bdc33d98 | 3211 | |
b3924a2c | 3212 | /* Ordinary labels go in the current function scope. */ |
f805d53d | 3213 | bind_label (name, label, current_function_scope, label_vars); |
51ef3909 | 3214 | } |
bdc33d98 | 3215 | |
8b6866af | 3216 | if (!in_system_header && lookup_name (name)) |
e60a6f7b | 3217 | warning_at (location, OPT_Wtraditional, |
3218 | "traditional C lacks a separate namespace " | |
3219 | "for labels, identifier %qE conflicts", name); | |
bdc33d98 | 3220 | |
3221 | /* Mark label as having been defined. */ | |
3222 | DECL_INITIAL (label) = error_mark_node; | |
3223 | return label; | |
51ef3909 | 3224 | } |
51ef3909 | 3225 | \f |
f805d53d | 3226 | /* Get the bindings for a new switch statement. This is used to issue |
3227 | warnings as appropriate for jumps from the switch to case or | |
3228 | default labels. */ | |
3229 | ||
3230 | struct c_spot_bindings * | |
3231 | c_get_switch_bindings (void) | |
3232 | { | |
3233 | struct c_spot_bindings *switch_bindings; | |
3234 | ||
3235 | switch_bindings = XNEW (struct c_spot_bindings); | |
3236 | set_spot_bindings (switch_bindings, true); | |
3237 | return switch_bindings; | |
3238 | } | |
3239 | ||
3240 | void | |
3241 | c_release_switch_bindings (struct c_spot_bindings *bindings) | |
3242 | { | |
3243 | gcc_assert (bindings->stmt_exprs == 0 && !bindings->left_stmt_expr); | |
3244 | XDELETE (bindings); | |
3245 | } | |
3246 | ||
3247 | /* This is called at the point of a case or default label to issue | |
3248 | warnings about decls as needed. It returns true if it found an | |
3249 | error, not just a warning. */ | |
3250 | ||
3251 | bool | |
3252 | c_check_switch_jump_warnings (struct c_spot_bindings *switch_bindings, | |
3253 | location_t switch_loc, location_t case_loc) | |
3254 | { | |
3255 | bool saw_error; | |
3256 | struct c_scope *scope; | |
3257 | ||
3258 | saw_error = false; | |
3259 | for (scope = current_scope; | |
3260 | scope != switch_bindings->scope; | |
3261 | scope = scope->outer) | |
3262 | { | |
3263 | struct c_binding *b; | |
3264 | ||
3265 | gcc_assert (scope != NULL); | |
3266 | for (b = scope->bindings; b != NULL; b = b->prev) | |
3267 | { | |
3268 | if (decl_jump_unsafe (b->decl)) | |
3269 | { | |
3270 | if (variably_modified_type_p (TREE_TYPE (b->decl), NULL_TREE)) | |
3271 | { | |
3272 | saw_error = true; | |
3273 | error_at (case_loc, | |
3274 | ("switch jumps into scope of identifier with " | |
3275 | "variably modified type")); | |
3276 | } | |
3277 | else | |
3278 | warning_at (case_loc, OPT_Wjump_misses_init, | |
3279 | "switch jumps over variable initialization"); | |
3280 | inform (switch_loc, "switch starts here"); | |
3281 | inform (DECL_SOURCE_LOCATION (b->decl), "%qD declared here", | |
3282 | b->decl); | |
3283 | } | |
3284 | } | |
3285 | } | |
3286 | ||
3287 | if (switch_bindings->stmt_exprs > 0) | |
3288 | { | |
3289 | saw_error = true; | |
3290 | error_at (case_loc, "switch jumps into statement expression"); | |
3291 | inform (switch_loc, "switch starts here"); | |
3292 | } | |
3293 | ||
3294 | return saw_error; | |
3295 | } | |
3296 | \f | |
51ef3909 | 3297 | /* Given NAME, an IDENTIFIER_NODE, |
3298 | return the structure (or union or enum) definition for that name. | |
6e899616 | 3299 | If THISLEVEL_ONLY is nonzero, searches only the current_scope. |
51ef3909 | 3300 | CODE says which kind of type the caller wants; |
3301 | it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE. | |
0b09525f | 3302 | If PLOC is not NULL and this returns non-null, it sets *PLOC to the |
3303 | location where the tag was defined. | |
51ef3909 | 3304 | If the wrong kind of type is found, an error is reported. */ |
3305 | ||
3306 | static tree | |
0b09525f | 3307 | lookup_tag (enum tree_code code, tree name, int thislevel_only, |
3308 | location_t *ploc) | |
51ef3909 | 3309 | { |
393b349a | 3310 | struct c_binding *b = I_TAG_BINDING (name); |
31ddae9f | 3311 | int thislevel = 0; |
51ef3909 | 3312 | |
393b349a | 3313 | if (!b || !b->decl) |
31ddae9f | 3314 | return 0; |
3315 | ||
3316 | /* We only care about whether it's in this level if | |
3317 | thislevel_only was set or it might be a type clash. */ | |
393b349a | 3318 | if (thislevel_only || TREE_CODE (b->decl) != code) |
3319 | { | |
3320 | /* For our purposes, a tag in the external scope is the same as | |
3321 | a tag in the file scope. (Primarily relevant to Objective-C | |
3322 | and its builtin structure tags, which get pushed before the | |
14338e9a | 3323 | file scope is created.) */ |
4194491a | 3324 | if (B_IN_CURRENT_SCOPE (b) |
3325 | || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b))) | |
31ddae9f | 3326 | thislevel = 1; |
51ef3909 | 3327 | } |
31ddae9f | 3328 | |
3329 | if (thislevel_only && !thislevel) | |
3330 | return 0; | |
3331 | ||
393b349a | 3332 | if (TREE_CODE (b->decl) != code) |
31ddae9f | 3333 | { |
3334 | /* Definition isn't the kind we were looking for. */ | |
3335 | pending_invalid_xref = name; | |
bca5a169 | 3336 | pending_invalid_xref_location = input_location; |
31ddae9f | 3337 | |
3338 | /* If in the same binding level as a declaration as a tag | |
3339 | of a different type, this must not be allowed to | |
3340 | shadow that tag, so give the error immediately. | |
3341 | (For example, "struct foo; union foo;" is invalid.) */ | |
3342 | if (thislevel) | |
3343 | pending_xref_error (); | |
3344 | } | |
0b09525f | 3345 | |
3346 | if (ploc != NULL) | |
3347 | *ploc = b->locus; | |
3348 | ||
393b349a | 3349 | return b->decl; |
51ef3909 | 3350 | } |
3351 | ||
3352 | /* Print an error message now | |
3353 | for a recent invalid struct, union or enum cross reference. | |
3354 | We don't print them immediately because they are not invalid | |
3355 | when used in the `struct foo;' construct for shadowing. */ | |
3356 | ||
3357 | void | |
1cae46be | 3358 | pending_xref_error (void) |
51ef3909 | 3359 | { |
3360 | if (pending_invalid_xref != 0) | |
5fb6a912 | 3361 | error_at (pending_invalid_xref_location, "%qE defined as wrong kind of tag", |
3362 | pending_invalid_xref); | |
51ef3909 | 3363 | pending_invalid_xref = 0; |
3364 | } | |
3365 | ||
51ef3909 | 3366 | \f |
6e899616 | 3367 | /* Look up NAME in the current scope and its superiors |
51ef3909 | 3368 | in the namespace of variables, functions and typedefs. |
3369 | Return a ..._DECL node of some kind representing its definition, | |
3370 | or return 0 if it is undefined. */ | |
3371 | ||
3372 | tree | |
1cae46be | 3373 | lookup_name (tree name) |
51ef3909 | 3374 | { |
393b349a | 3375 | struct c_binding *b = I_SYMBOL_BINDING (name); |
4194491a | 3376 | if (b && !b->invisible) |
393b349a | 3377 | return b->decl; |
3378 | return 0; | |
51ef3909 | 3379 | } |
3380 | ||
393b349a | 3381 | /* Similar to `lookup_name' but look only at the indicated scope. */ |
51ef3909 | 3382 | |
31ddae9f | 3383 | static tree |
393b349a | 3384 | lookup_name_in_scope (tree name, struct c_scope *scope) |
51ef3909 | 3385 | { |
393b349a | 3386 | struct c_binding *b; |
31ddae9f | 3387 | |
393b349a | 3388 | for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed) |
4194491a | 3389 | if (B_IN_SCOPE (b, scope)) |
393b349a | 3390 | return b->decl; |
31ddae9f | 3391 | return 0; |
51ef3909 | 3392 | } |
3393 | \f | |
3394 | /* Create the predefined scalar types of C, | |
a92771b8 | 3395 | and some nodes representing standard constants (0, 1, (void *) 0). |
6e899616 | 3396 | Initialize the global scope. |
51ef3909 | 3397 | Make definitions for built-in primitive functions. */ |
3398 | ||
3399 | void | |
1cae46be | 3400 | c_init_decl_processing (void) |
51ef3909 | 3401 | { |
fb050357 | 3402 | location_t save_loc = input_location; |
d9cf68bf | 3403 | |
1576dec7 | 3404 | /* Initialize reserved words for parser. */ |
9ceb1c29 | 3405 | c_parse_init (); |
3406 | ||
b3924a2c | 3407 | current_function_decl = 0; |
4214af46 | 3408 | |
9823d3a9 | 3409 | gcc_obstack_init (&parser_obstack); |
3410 | ||
393b349a | 3411 | /* Make the externals scope. */ |
3412 | push_scope (); | |
3413 | external_scope = current_scope; | |
b3924a2c | 3414 | |
6d042e21 | 3415 | /* Declarations from c_common_nodes_and_builtins must not be associated |
3416 | with this input file, lest we get differences between using and not | |
3417 | using preprocessed headers. */ | |
9a6486a6 | 3418 | input_location = BUILTINS_LOCATION; |
51ef3909 | 3419 | |
1561d3cd | 3420 | build_common_tree_nodes (flag_signed_char, false); |
51ef3909 | 3421 | |
174fcc61 | 3422 | c_common_nodes_and_builtins (); |
51ef3909 | 3423 | |
3c2239cf | 3424 | /* In C, comparisons and TRUTH_* expressions have type int. */ |
3425 | truthvalue_type_node = integer_type_node; | |
3426 | truthvalue_true_node = integer_one_node; | |
3427 | truthvalue_false_node = integer_zero_node; | |
3428 | ||
3429 | /* Even in C99, which has a real boolean type. */ | |
e60a6f7b | 3430 | pushdecl (build_decl (UNKNOWN_LOCATION, TYPE_DECL, get_identifier ("_Bool"), |
3c2239cf | 3431 | boolean_type_node)); |
4f9a1c9b | 3432 | |
fb050357 | 3433 | input_location = save_loc; |
6d042e21 | 3434 | |
a7ea5e81 | 3435 | pedantic_lvalues = true; |
42dc8caf | 3436 | |
9e5a737d | 3437 | make_fname_decl = c_make_fname_decl; |
65b7f83f | 3438 | start_fname_decls (); |
51ef3909 | 3439 | } |
3440 | ||
e60a6f7b | 3441 | /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to |
3442 | give the decl, NAME is the initialization string and TYPE_DEP | |
3443 | indicates whether NAME depended on the type of the function. As we | |
3444 | don't yet implement delayed emission of static data, we mark the | |
3445 | decl as emitted so it is not placed in the output. Anything using | |
3446 | it must therefore pull out the STRING_CST initializer directly. | |
3447 | FIXME. */ | |
9e5a737d | 3448 | |
3449 | static tree | |
e60a6f7b | 3450 | c_make_fname_decl (location_t loc, tree id, int type_dep) |
9e5a737d | 3451 | { |
65b7f83f | 3452 | const char *name = fname_as_string (type_dep); |
9e5a737d | 3453 | tree decl, type, init; |
3454 | size_t length = strlen (name); | |
3455 | ||
aebc8537 | 3456 | type = build_array_type (char_type_node, |
3457 | build_index_type (size_int (length))); | |
3458 | type = c_build_qualified_type (type, TYPE_QUAL_CONST); | |
9e5a737d | 3459 | |
e60a6f7b | 3460 | decl = build_decl (loc, VAR_DECL, id, type); |
1cae46be | 3461 | |
9e5a737d | 3462 | TREE_STATIC (decl) = 1; |
3463 | TREE_READONLY (decl) = 1; | |
9e5a737d | 3464 | DECL_ARTIFICIAL (decl) = 1; |
1cae46be | 3465 | |
9e5a737d | 3466 | init = build_string (length + 1, name); |
e47a6f81 | 3467 | free (CONST_CAST (char *, name)); |
9e5a737d | 3468 | TREE_TYPE (init) = type; |
3469 | DECL_INITIAL (decl) = init; | |
65b7f83f | 3470 | |
3471 | TREE_USED (decl) = 1; | |
81010c97 | 3472 | |
c902ba74 | 3473 | if (current_function_decl |
3474 | /* For invalid programs like this: | |
3475 | ||
3476 | void foo() | |
3477 | const char* p = __FUNCTION__; | |
3478 | ||
3479 | the __FUNCTION__ is believed to appear in K&R style function | |
3480 | parameter declarator. In that case we still don't have | |
3481 | function_scope. */ | |
3482 | && (!errorcount || current_function_scope)) | |
3bdb6310 | 3483 | { |
3484 | DECL_CONTEXT (decl) = current_function_decl; | |
4194491a | 3485 | bind (id, decl, current_function_scope, |
6fb80942 | 3486 | /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION); |
3bdb6310 | 3487 | } |
31ddae9f | 3488 | |
e60a6f7b | 3489 | finish_decl (decl, loc, init, NULL_TREE, NULL_TREE); |
4214af46 | 3490 | |
9e5a737d | 3491 | return decl; |
3492 | } | |
3493 | ||
08f8d953 | 3494 | tree |
54be5d7e | 3495 | c_builtin_function (tree decl) |
51ef3909 | 3496 | { |
54be5d7e | 3497 | tree type = TREE_TYPE (decl); |
3498 | tree id = DECL_NAME (decl); | |
3499 | ||
3500 | const char *name = IDENTIFIER_POINTER (id); | |
3eafcdb5 | 3501 | C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0); |
8305149e | 3502 | |
393b349a | 3503 | /* Should never be called on a symbol with a preexisting meaning. */ |
231bd014 | 3504 | gcc_assert (!I_SYMBOL_BINDING (id)); |
393b349a | 3505 | |
6fb80942 | 3506 | bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false, |
3507 | UNKNOWN_LOCATION); | |
393b349a | 3508 | |
24470055 | 3509 | /* Builtins in the implementation namespace are made visible without |
3510 | needing to be explicitly declared. See push_file_scope. */ | |
3511 | if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1]))) | |
3512 | { | |
3513 | TREE_CHAIN (decl) = visible_builtins; | |
3514 | visible_builtins = decl; | |
3515 | } | |
3516 | ||
3517 | return decl; | |
3518 | } | |
3519 | ||
3520 | tree | |
3521 | c_builtin_function_ext_scope (tree decl) | |
3522 | { | |
3523 | tree type = TREE_TYPE (decl); | |
3524 | tree id = DECL_NAME (decl); | |
3525 | ||
3526 | const char *name = IDENTIFIER_POINTER (id); | |
3527 | C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0); | |
3528 | ||
3529 | /* Should never be called on a symbol with a preexisting meaning. */ | |
3530 | gcc_assert (!I_SYMBOL_BINDING (id)); | |
3531 | ||
6fb80942 | 3532 | bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false, |
3533 | UNKNOWN_LOCATION); | |
24470055 | 3534 | |
393b349a | 3535 | /* Builtins in the implementation namespace are made visible without |
3536 | needing to be explicitly declared. See push_file_scope. */ | |
3537 | if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1]))) | |
3538 | { | |
3539 | TREE_CHAIN (decl) = visible_builtins; | |
3540 | visible_builtins = decl; | |
3541 | } | |
51ef3909 | 3542 | |
3543 | return decl; | |
3544 | } | |
3545 | \f | |
3546 | /* Called when a declaration is seen that contains no names to declare. | |
3547 | If its type is a reference to a structure, union or enum inherited | |
3548 | from a containing scope, shadow that tag name for the current scope | |
3549 | with a forward reference. | |
3550 | If its type defines a new named structure or union | |
3551 | or defines an enum, it is valid but we need not do anything here. | |
3552 | Otherwise, it is an error. */ | |
3553 | ||
3554 | void | |
9553111d | 3555 | shadow_tag (const struct c_declspecs *declspecs) |
0d137cd9 | 3556 | { |
3557 | shadow_tag_warned (declspecs, 0); | |
3558 | } | |
3559 | ||
b2c4af5e | 3560 | /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning, |
3561 | but no pedwarn. */ | |
0d137cd9 | 3562 | void |
9553111d | 3563 | shadow_tag_warned (const struct c_declspecs *declspecs, int warned) |
51ef3909 | 3564 | { |
9553111d | 3565 | bool found_tag = false; |
51ef3909 | 3566 | |
70dd11f7 | 3567 | if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p) |
51ef3909 | 3568 | { |
9553111d | 3569 | tree value = declspecs->type; |
19cb6b50 | 3570 | enum tree_code code = TREE_CODE (value); |
51ef3909 | 3571 | |
3572 | if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE) | |
3573 | /* Used to test also that TYPE_SIZE (value) != 0. | |
3574 | That caused warning for `struct foo;' at top level in the file. */ | |
3575 | { | |
31ddae9f | 3576 | tree name = TYPE_NAME (value); |
19cb6b50 | 3577 | tree t; |
51ef3909 | 3578 | |
9553111d | 3579 | found_tag = true; |
51ef3909 | 3580 | |
577f4774 | 3581 | if (declspecs->restrict_p) |
3582 | { | |
3583 | error ("invalid use of %<restrict%>"); | |
3584 | warned = 1; | |
3585 | } | |
3586 | ||
51ef3909 | 3587 | if (name == 0) |
3588 | { | |
677cfa00 | 3589 | if (warned != 1 && code != ENUMERAL_TYPE) |
3590 | /* Empty unnamed enum OK */ | |
51ef3909 | 3591 | { |
21ca8540 | 3592 | pedwarn (input_location, 0, |
3593 | "unnamed struct/union that defines no instances"); | |
51ef3909 | 3594 | warned = 1; |
3595 | } | |
3596 | } | |
19702c1d | 3597 | else if (!declspecs->tag_defined_p |
3598 | && declspecs->storage_class != csc_none) | |
3599 | { | |
3600 | if (warned != 1) | |
21ca8540 | 3601 | pedwarn (input_location, 0, |
3602 | "empty declaration with storage class specifier " | |
3603 | "does not redeclare tag"); | |
19702c1d | 3604 | warned = 1; |
3605 | pending_xref_error (); | |
3606 | } | |
3607 | else if (!declspecs->tag_defined_p | |
3608 | && (declspecs->const_p | |
3609 | || declspecs->volatile_p | |
3610 | || declspecs->restrict_p)) | |
3611 | { | |
3612 | if (warned != 1) | |
21ca8540 | 3613 | pedwarn (input_location, 0, |
3614 | "empty declaration with type qualifier " | |
8864917d | 3615 | "does not redeclare tag"); |
19702c1d | 3616 | warned = 1; |
3617 | pending_xref_error (); | |
3618 | } | |
51ef3909 | 3619 | else |
3620 | { | |
19702c1d | 3621 | pending_invalid_xref = 0; |
0b09525f | 3622 | t = lookup_tag (code, name, 1, NULL); |
51ef3909 | 3623 | |
3624 | if (t == 0) | |
3625 | { | |
3626 | t = make_node (code); | |
e60a6f7b | 3627 | pushtag (input_location, name, t); |
51ef3909 | 3628 | } |
3629 | } | |
3630 | } | |
3631 | else | |
3632 | { | |
9553111d | 3633 | if (warned != 1 && !in_system_header) |
677cfa00 | 3634 | { |
21ca8540 | 3635 | pedwarn (input_location, 0, |
3636 | "useless type name in empty declaration"); | |
9553111d | 3637 | warned = 1; |
677cfa00 | 3638 | } |
51ef3909 | 3639 | } |
3640 | } | |
490eec42 | 3641 | else if (warned != 1 && !in_system_header && declspecs->typedef_p) |
9553111d | 3642 | { |
21ca8540 | 3643 | pedwarn (input_location, 0, "useless type name in empty declaration"); |
9553111d | 3644 | warned = 1; |
3645 | } | |
3646 | ||
19702c1d | 3647 | pending_invalid_xref = 0; |
3648 | ||
feb04535 | 3649 | if (declspecs->inline_p) |
3650 | { | |
3651 | error ("%<inline%> in empty declaration"); | |
3652 | warned = 1; | |
3653 | } | |
3654 | ||
3655 | if (current_scope == file_scope && declspecs->storage_class == csc_auto) | |
3656 | { | |
3657 | error ("%<auto%> in file-scope empty declaration"); | |
3658 | warned = 1; | |
3659 | } | |
3660 | ||
3661 | if (current_scope == file_scope && declspecs->storage_class == csc_register) | |
3662 | { | |
3663 | error ("%<register%> in file-scope empty declaration"); | |
3664 | warned = 1; | |
3665 | } | |
3666 | ||
3667 | if (!warned && !in_system_header && declspecs->storage_class != csc_none) | |
3668 | { | |
c3ceba8e | 3669 | warning (0, "useless storage class specifier in empty declaration"); |
feb04535 | 3670 | warned = 2; |
3671 | } | |
3672 | ||
3673 | if (!warned && !in_system_header && declspecs->thread_p) | |
3674 | { | |
c3ceba8e | 3675 | warning (0, "useless %<__thread%> in empty declaration"); |
feb04535 | 3676 | warned = 2; |
3677 | } | |
3678 | ||
bb476216 | 3679 | if (!warned && !in_system_header && (declspecs->const_p |
3680 | || declspecs->volatile_p | |
3681 | || declspecs->restrict_p)) | |
3682 | { | |
c3ceba8e | 3683 | warning (0, "useless type qualifier in empty declaration"); |
bb476216 | 3684 | warned = 2; |
3685 | } | |
3686 | ||
677cfa00 | 3687 | if (warned != 1) |
51ef3909 | 3688 | { |
9553111d | 3689 | if (!found_tag) |
21ca8540 | 3690 | pedwarn (input_location, 0, "empty declaration"); |
51ef3909 | 3691 | } |
3692 | } | |
3693 | \f | |
bb476216 | 3694 | |
3695 | /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_* | |
3696 | bits. SPECS represents declaration specifiers that the grammar | |
3697 | only permits to contain type qualifiers and attributes. */ | |
3698 | ||
3699 | int | |
3700 | quals_from_declspecs (const struct c_declspecs *specs) | |
3701 | { | |
3702 | int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0) | |
3703 | | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0) | |
3704 | | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0)); | |
3705 | gcc_assert (!specs->type | |
3706 | && !specs->decl_attr | |
70dd11f7 | 3707 | && specs->typespec_word == cts_none |
bb476216 | 3708 | && specs->storage_class == csc_none |
3709 | && !specs->typedef_p | |
70dd11f7 | 3710 | && !specs->explicit_signed_p |
bb476216 | 3711 | && !specs->deprecated_p |
70dd11f7 | 3712 | && !specs->long_p |
bb476216 | 3713 | && !specs->long_long_p |
70dd11f7 | 3714 | && !specs->short_p |
3715 | && !specs->signed_p | |
3716 | && !specs->unsigned_p | |
3717 | && !specs->complex_p | |
bb476216 | 3718 | && !specs->inline_p |
3719 | && !specs->thread_p); | |
3720 | return quals; | |
3721 | } | |
3722 | ||
e60a6f7b | 3723 | /* Construct an array declarator. LOC is the location of the |
3724 | beginning of the array (usually the opening brace). EXPR is the | |
3725 | expression inside [], or NULL_TREE. QUALS are the type qualifiers | |
3726 | inside the [] (to be applied to the pointer to which a parameter | |
3727 | array is converted). STATIC_P is true if "static" is inside the | |
3728 | [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a | |
3729 | VLA of unspecified length which is nevertheless a complete type, | |
3730 | false otherwise. The field for the contained declarator is left to | |
3731 | be filled in by set_array_declarator_inner. */ | |
1fd94215 | 3732 | |
ac206aff | 3733 | struct c_declarator * |
e60a6f7b | 3734 | build_array_declarator (location_t loc, |
3735 | tree expr, struct c_declspecs *quals, bool static_p, | |
4a125bfc | 3736 | bool vla_unspec_p) |
1fd94215 | 3737 | { |
ac206aff | 3738 | struct c_declarator *declarator = XOBNEW (&parser_obstack, |
3739 | struct c_declarator); | |
e60a6f7b | 3740 | declarator->id_loc = loc; |
ac206aff | 3741 | declarator->kind = cdk_array; |
3742 | declarator->declarator = 0; | |
3743 | declarator->u.array.dimen = expr; | |
bb476216 | 3744 | if (quals) |
3745 | { | |
3746 | declarator->u.array.attrs = quals->attrs; | |
3747 | declarator->u.array.quals = quals_from_declspecs (quals); | |
3748 | } | |
3749 | else | |
3750 | { | |
3751 | declarator->u.array.attrs = NULL_TREE; | |
3752 | declarator->u.array.quals = 0; | |
3753 | } | |
ac206aff | 3754 | declarator->u.array.static_p = static_p; |
3755 | declarator->u.array.vla_unspec_p = vla_unspec_p; | |
8864917d | 3756 | if (!flag_isoc99) |
1fd94215 | 3757 | { |
9553111d | 3758 | if (static_p || quals != NULL) |
e60a6f7b | 3759 | pedwarn (loc, OPT_pedantic, |
21ca8540 | 3760 | "ISO C90 does not support %<static%> or type " |
b0b1af64 | 3761 | "qualifiers in parameter array declarators"); |
1fd94215 | 3762 | if (vla_unspec_p) |
e60a6f7b | 3763 | pedwarn (loc, OPT_pedantic, |
21ca8540 | 3764 | "ISO C90 does not support %<[*]%> array declarators"); |
1fd94215 | 3765 | } |
3766 | if (vla_unspec_p) | |
32d33ab2 | 3767 | { |
3768 | if (!current_scope->parm_flag) | |
3769 | { | |
3770 | /* C99 6.7.5.2p4 */ | |
e60a6f7b | 3771 | error_at (loc, "%<[*]%> not allowed in other than " |
3772 | "function prototype scope"); | |
32d33ab2 | 3773 | declarator->u.array.vla_unspec_p = false; |
3774 | return NULL; | |
3775 | } | |
3776 | current_scope->had_vla_unspec = true; | |
3777 | } | |
ac206aff | 3778 | return declarator; |
1fd94215 | 3779 | } |
3780 | ||
ac206aff | 3781 | /* Set the contained declarator of an array declarator. DECL is the |
3782 | declarator, as constructed by build_array_declarator; INNER is what | |
e6c172ed | 3783 | appears on the left of the []. */ |
1fd94215 | 3784 | |
ac206aff | 3785 | struct c_declarator * |
3786 | set_array_declarator_inner (struct c_declarator *decl, | |
e6c172ed | 3787 | struct c_declarator *inner) |
1fd94215 | 3788 | { |
ac206aff | 3789 | decl->declarator = inner; |
1fd94215 | 3790 | return decl; |
3791 | } | |
4287354c | 3792 | |
3793 | /* INIT is a constructor that forms DECL's initializer. If the final | |
3794 | element initializes a flexible array field, add the size of that | |
3795 | initializer to DECL's size. */ | |
3796 | ||
3797 | static void | |
3798 | add_flexible_array_elts_to_size (tree decl, tree init) | |
3799 | { | |
4287354c | 3800 | tree elt, type; |
3801 | ||
b54ed23c | 3802 | if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init))) |
4287354c | 3803 | return; |
3804 | ||
b54ed23c | 3805 | elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value; |
4287354c | 3806 | type = TREE_TYPE (elt); |
3807 | if (TREE_CODE (type) == ARRAY_TYPE | |
3808 | && TYPE_SIZE (type) == NULL_TREE | |
3809 | && TYPE_DOMAIN (type) != NULL_TREE | |
3810 | && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE) | |
3811 | { | |
3812 | complete_array_type (&type, elt, false); | |
3813 | DECL_SIZE (decl) | |
3814 | = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type)); | |
3815 | DECL_SIZE_UNIT (decl) | |
3816 | = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type)); | |
3817 | } | |
3818 | } | |
1fd94215 | 3819 | \f |
a75b1c71 | 3820 | /* Decode a "typename", such as "int **", returning a ..._TYPE node. |
3821 | Set *EXPR, if EXPR not NULL, to any expression to be evaluated | |
3822 | before the type name, and set *EXPR_CONST_OPERANDS, if | |
3823 | EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may | |
3824 | appear in a constant expression. */ | |
51ef3909 | 3825 | |
3826 | tree | |
a75b1c71 | 3827 | groktypename (struct c_type_name *type_name, tree *expr, |
3828 | bool *expr_const_operands) | |
51ef3909 | 3829 | { |
ac206aff | 3830 | tree type; |
9553111d | 3831 | tree attrs = type_name->specs->attrs; |
9d45592a | 3832 | |
9553111d | 3833 | type_name->specs->attrs = NULL_TREE; |
9d45592a | 3834 | |
9553111d | 3835 | type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME, |
a75b1c71 | 3836 | false, NULL, &attrs, expr, expr_const_operands, |
3837 | DEPRECATED_NORMAL); | |
9d45592a | 3838 | |
3839 | /* Apply attributes. */ | |
ac206aff | 3840 | decl_attributes (&type, attrs, 0); |
9d45592a | 3841 | |
ac206aff | 3842 | return type; |
51ef3909 | 3843 | } |
3844 | ||
51ef3909 | 3845 | /* Decode a declarator in an ordinary declaration or data definition. |
3846 | This is called as soon as the type information and variable name | |
3847 | have been parsed, before parsing the initializer if any. | |
3848 | Here we create the ..._DECL node, fill in its type, | |
3849 | and put it on the list of decls for the current context. | |
3850 | The ..._DECL node is returned as the value. | |
3851 | ||
3852 | Exception: for arrays where the length is not specified, | |
3853 | the type is left null, to be filled in by `finish_decl'. | |
3854 | ||
3855 | Function definitions do not come here; they go to start_function | |
3856 | instead. However, external and forward declarations of functions | |
3857 | do go through here. Structure field declarations are done by | |
3858 | grokfield and not through here. */ | |
3859 | ||
51ef3909 | 3860 | tree |
9553111d | 3861 | start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs, |
ac206aff | 3862 | bool initialized, tree attributes) |
51ef3909 | 3863 | { |
88da234d | 3864 | tree decl; |
19cb6b50 | 3865 | tree tem; |
a75b1c71 | 3866 | tree expr = NULL_TREE; |
81f218ec | 3867 | enum deprecated_states deprecated_state = DEPRECATED_NORMAL; |
1cae46be | 3868 | |
88da234d | 3869 | /* An object declared as __attribute__((deprecated)) suppresses |
3870 | warnings of uses of other deprecated items. */ | |
3871 | if (lookup_attribute ("deprecated", attributes)) | |
3872 | deprecated_state = DEPRECATED_SUPPRESS; | |
3873 | ||
3874 | decl = grokdeclarator (declarator, declspecs, | |
a75b1c71 | 3875 | NORMAL, initialized, NULL, &attributes, &expr, NULL, |
81f218ec | 3876 | deprecated_state); |
61ba37bf | 3877 | if (!decl) |
3878 | return 0; | |
1cae46be | 3879 | |
a75b1c71 | 3880 | if (expr) |
3881 | add_stmt (expr); | |
3882 | ||
23efcc02 | 3883 | if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl))) |
3cf8b391 | 3884 | warning (OPT_Wmain, "%q+D is usually a function", decl); |
869a2569 | 3885 | |
51ef3909 | 3886 | if (initialized) |
3887 | /* Is it valid for this decl to have an initializer at all? | |
3888 | If not, set INITIALIZED to zero, which will indirectly | |
393b349a | 3889 | tell 'finish_decl' to ignore the initializer once it is parsed. */ |
51ef3909 | 3890 | switch (TREE_CODE (decl)) |
3891 | { | |
3892 | case TYPE_DECL: | |
b0b1af64 | 3893 | error ("typedef %qD is initialized (use __typeof__ instead)", decl); |
f6f89f14 | 3894 | initialized = 0; |
51ef3909 | 3895 | break; |
3896 | ||
3897 | case FUNCTION_DECL: | |
b0b1af64 | 3898 | error ("function %qD is initialized like a variable", decl); |
51ef3909 | 3899 | initialized = 0; |
3900 | break; | |
3901 | ||
3902 | case PARM_DECL: | |
3903 | /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */ | |
b0b1af64 | 3904 | error ("parameter %qD is initialized", decl); |
51ef3909 | 3905 | initialized = 0; |
3906 | break; | |
3907 | ||
3908 | default: | |
393b349a | 3909 | /* Don't allow initializations for incomplete types except for |
3910 | arrays which might be completed by the initialization. */ | |
ee5b587b | 3911 | |
393b349a | 3912 | /* This can happen if the array size is an undefined macro. |
3913 | We already gave a warning, so we don't need another one. */ | |
ee5b587b | 3914 | if (TREE_TYPE (decl) == error_mark_node) |
3915 | initialized = 0; | |
3916 | else if (COMPLETE_TYPE_P (TREE_TYPE (decl))) | |
51ef3909 | 3917 | { |
3918 | /* A complete type is ok if size is fixed. */ | |
3919 | ||
3920 | if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST | |
3921 | || C_DECL_VARIABLE_SIZE (decl)) | |
3922 | { | |
3923 | error ("variable-sized object may not be initialized"); | |
3924 | initialized = 0; | |
3925 | } | |
3926 | } | |
3927 | else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE) | |
3928 | { | |
b0b1af64 | 3929 | error ("variable %qD has initializer but incomplete type", decl); |
51ef3909 | 3930 | initialized = 0; |
3931 | } | |
5cbd179d | 3932 | else if (C_DECL_VARIABLE_SIZE (decl)) |
3933 | { | |
3934 | /* Although C99 is unclear about whether incomplete arrays | |
3935 | of VLAs themselves count as VLAs, it does not make | |
3936 | sense to permit them to be initialized given that | |
3937 | ordinary VLAs may not be initialized. */ | |
3938 | error ("variable-sized object may not be initialized"); | |
3939 | initialized = 0; | |
3940 | } | |
51ef3909 | 3941 | } |
3942 | ||
3943 | if (initialized) | |
3944 | { | |
393b349a | 3945 | if (current_scope == file_scope) |
51ef3909 | 3946 | TREE_STATIC (decl) = 1; |
3947 | ||
393b349a | 3948 | /* Tell 'pushdecl' this is an initialized decl |
51ef3909 | 3949 | even though we don't yet have the initializer expression. |
393b349a | 3950 | Also tell 'finish_decl' it may store the real initializer. */ |
51ef3909 | 3951 | DECL_INITIAL (decl) = error_mark_node; |
3952 | } | |
3953 | ||
3954 | /* If this is a function declaration, write a record describing it to the | |
3955 | prototypes file (if requested). */ | |
3956 | ||
3957 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
3958 | gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0); | |
3959 | ||
9493f142 | 3960 | /* ANSI specifies that a tentative definition which is not merged with |
3961 | a non-tentative definition behaves exactly like a definition with an | |
3962 | initializer equal to zero. (Section 3.7.2) | |
2a6f0f81 | 3963 | |
3964 | -fno-common gives strict ANSI behavior, though this tends to break | |
3965 | a large body of code that grew up without this rule. | |
3966 | ||
3967 | Thread-local variables are never common, since there's no entrenched | |
3968 | body of code to break, and it allows more efficient variable references | |
d716ce75 | 3969 | in the presence of dynamic linking. */ |
2a6f0f81 | 3970 | |
3971 | if (TREE_CODE (decl) == VAR_DECL | |
3972 | && !initialized | |
3973 | && TREE_PUBLIC (decl) | |
1b53eb20 | 3974 | && !DECL_THREAD_LOCAL_P (decl) |
2a6f0f81 | 3975 | && !flag_no_common) |
9493f142 | 3976 | DECL_COMMON (decl) = 1; |
7c090a86 | 3977 | |
431e45c6 | 3978 | /* Set attributes here so if duplicate decl, will have proper attributes. */ |
9581e01c | 3979 | decl_attributes (&decl, attributes, 0); |
431e45c6 | 3980 | |
541e4101 | 3981 | /* Handle gnu_inline attribute. */ |
3982 | if (declspecs->inline_p | |
11950bdd | 3983 | && !flag_gnu89_inline |
541e4101 | 3984 | && TREE_CODE (decl) == FUNCTION_DECL |
56f06eef | 3985 | && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl)) |
3986 | || current_function_decl)) | |
541e4101 | 3987 | { |
3988 | if (declspecs->storage_class == csc_auto && current_scope != file_scope) | |
3989 | ; | |
3990 | else if (declspecs->storage_class != csc_static) | |
3991 | DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl); | |
3992 | } | |
541e4101 | 3993 | |
45550790 | 3994 | if (TREE_CODE (decl) == FUNCTION_DECL |
3995 | && targetm.calls.promote_prototypes (TREE_TYPE (decl))) | |
3996 | { | |
ac206aff | 3997 | struct c_declarator *ce = declarator; |
45550790 | 3998 | |
ac206aff | 3999 | if (ce->kind == cdk_pointer) |
4000 | ce = declarator->declarator; | |
4001 | if (ce->kind == cdk_function) | |
45550790 | 4002 | { |
ac206aff | 4003 | tree args = ce->u.arg_info->parms; |
45550790 | 4004 | for (; args; args = TREE_CHAIN (args)) |
4005 | { | |
4006 | tree type = TREE_TYPE (args); | |
3ac12e63 | 4007 | if (type && INTEGRAL_TYPE_P (type) |
45550790 | 4008 | && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) |
4009 | DECL_ARG_TYPE (args) = integer_type_node; | |
4010 | } | |
4011 | } | |
4012 | } | |
4013 | ||
93f10b04 | 4014 | if (TREE_CODE (decl) == FUNCTION_DECL |
4015 | && DECL_DECLARED_INLINE_P (decl) | |
4016 | && DECL_UNINLINABLE (decl) | |
4017 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl))) | |
3cf8b391 | 4018 | warning (OPT_Wattributes, "inline function %q+D given attribute noinline", |
4019 | decl); | |
93f10b04 | 4020 | |
c42cc79e | 4021 | /* C99 6.7.4p3: An inline definition of a function with external |
4022 | linkage shall not contain a definition of a modifiable object | |
4023 | with static storage duration... */ | |
4024 | if (TREE_CODE (decl) == VAR_DECL | |
4025 | && current_scope != file_scope | |
4026 | && TREE_STATIC (decl) | |
c55e2943 | 4027 | && !TREE_READONLY (decl) |
c42cc79e | 4028 | && DECL_DECLARED_INLINE_P (current_function_decl) |
4029 | && DECL_EXTERNAL (current_function_decl)) | |
551ed71a | 4030 | record_inline_static (input_location, current_function_decl, |
4031 | decl, csi_modifiable); | |
c42cc79e | 4032 | |
6e899616 | 4033 | /* Add this decl to the current scope. |
51ef3909 | 4034 | TEM may equal DECL or it may be a previous decl of the same name. */ |
4035 | tem = pushdecl (decl); | |
4036 | ||
851ee249 | 4037 | if (initialized && DECL_EXTERNAL (tem)) |
4038 | { | |
4039 | DECL_EXTERNAL (tem) = 0; | |
4040 | TREE_STATIC (tem) = 1; | |
4041 | } | |
8dfad60e | 4042 | |
51ef3909 | 4043 | return tem; |
4044 | } | |
4045 | ||
96faf93e | 4046 | /* Initialize EH if not initialized yet and exceptions are enabled. */ |
4047 | ||
4048 | void | |
4049 | c_maybe_initialize_eh (void) | |
4050 | { | |
4051 | if (!flag_exceptions || c_eh_initialized_p) | |
4052 | return; | |
4053 | ||
4054 | c_eh_initialized_p = true; | |
4055 | eh_personality_libfunc | |
4056 | = init_one_libfunc (USING_SJLJ_EXCEPTIONS | |
4057 | ? "__gcc_personality_sj0" | |
4058 | : "__gcc_personality_v0"); | |
4059 | default_init_unwind_resume_libfunc (); | |
4060 | using_eh_for_cleanups (); | |
4061 | } | |
4062 | ||
51ef3909 | 4063 | /* Finish processing of a declaration; |
4064 | install its initial value. | |
b9c74b4d | 4065 | If ORIGTYPE is not NULL_TREE, it is the original type of INIT. |
51ef3909 | 4066 | If the length of an array type is not known before, |
e60a6f7b | 4067 | it must be determined now, from the initial value, or it is an error. |
4068 | ||
4069 | INIT_LOC is the location of the initial value. */ | |
51ef3909 | 4070 | |
4071 | void | |
e60a6f7b | 4072 | finish_decl (tree decl, location_t init_loc, tree init, |
4073 | tree origtype, tree asmspec_tree) | |
51ef3909 | 4074 | { |
0dd13847 | 4075 | tree type; |
9eba252e | 4076 | bool was_incomplete = (DECL_SIZE (decl) == 0); |
44acf429 | 4077 | const char *asmspec = 0; |
51ef3909 | 4078 | |
1e625a2e | 4079 | /* If a name was specified, get the string. */ |
f3e21791 | 4080 | if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL) |
4081 | && DECL_FILE_SCOPE_P (decl)) | |
ea42c4de | 4082 | asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree); |
51ef3909 | 4083 | if (asmspec_tree) |
408ea82a | 4084 | asmspec = TREE_STRING_POINTER (asmspec_tree); |
51ef3909 | 4085 | |
4086 | /* If `start_decl' didn't like having an initialization, ignore it now. */ | |
51ef3909 | 4087 | if (init != 0 && DECL_INITIAL (decl) == 0) |
4088 | init = 0; | |
1cae46be | 4089 | |
51ef3909 | 4090 | /* Don't crash if parm is initialized. */ |
4091 | if (TREE_CODE (decl) == PARM_DECL) | |
4092 | init = 0; | |
4093 | ||
4094 | if (init) | |
e60a6f7b | 4095 | store_init_value (init_loc, decl, init, origtype); |
51ef3909 | 4096 | |
c17b85ea | 4097 | if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL |
b2c4af5e | 4098 | || TREE_CODE (decl) == FUNCTION_DECL |
4099 | || TREE_CODE (decl) == FIELD_DECL)) | |
c17b85ea | 4100 | objc_check_decl (decl); |
4101 | ||
0dd13847 | 4102 | type = TREE_TYPE (decl); |
4103 | ||
8b332087 | 4104 | /* Deduce size of array from initialization, if not already known. */ |
51ef3909 | 4105 | if (TREE_CODE (type) == ARRAY_TYPE |
4106 | && TYPE_DOMAIN (type) == 0 | |
4107 | && TREE_CODE (decl) != TYPE_DECL) | |
4108 | { | |
c271bdb2 | 4109 | bool do_default |
51ef3909 | 4110 | = (TREE_STATIC (decl) |
4111 | /* Even if pedantic, an external linkage array | |
4112 | may have incomplete type at first. */ | |
4113 | ? pedantic && !TREE_PUBLIC (decl) | |
5e58c22e | 4114 | : !DECL_EXTERNAL (decl)); |
51ef3909 | 4115 | int failure |
c271bdb2 | 4116 | = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl), |
4117 | do_default); | |
51ef3909 | 4118 | |
4119 | /* Get the completed type made by complete_array_type. */ | |
4120 | type = TREE_TYPE (decl); | |
4121 | ||
646a1d63 | 4122 | switch (failure) |
51ef3909 | 4123 | { |
646a1d63 | 4124 | case 1: |
3cf8b391 | 4125 | error ("initializer fails to determine size of %q+D", decl); |
646a1d63 | 4126 | break; |
4127 | ||
4128 | case 2: | |
51ef3909 | 4129 | if (do_default) |
3cf8b391 | 4130 | error ("array size missing in %q+D", decl); |
fc7d78c7 | 4131 | /* If a `static' var's size isn't known, |
4132 | make it extern as well as static, so it does not get | |
4133 | allocated. | |
4134 | If it is not `static', then do not mark extern; | |
4135 | finish_incomplete_decl will give it a default size | |
4136 | and it will get allocated. */ | |
84166705 | 4137 | else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl)) |
5e58c22e | 4138 | DECL_EXTERNAL (decl) = 1; |
646a1d63 | 4139 | break; |
4140 | ||
4141 | case 3: | |
3cf8b391 | 4142 | error ("zero or negative size array %q+D", decl); |
646a1d63 | 4143 | break; |
4144 | ||
4145 | case 0: | |
4146 | /* For global variables, update the copy of the type that | |
4147 | exists in the binding. */ | |
4148 | if (TREE_PUBLIC (decl)) | |
4149 | { | |
4150 | struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl)); | |
4151 | while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext)) | |
4152 | b_ext = b_ext->shadowed; | |
4153 | if (b_ext) | |
4154 | { | |
f805d53d | 4155 | if (b_ext->u.type) |
4156 | b_ext->u.type = composite_type (b_ext->u.type, type); | |
646a1d63 | 4157 | else |
f805d53d | 4158 | b_ext->u.type = type; |
646a1d63 | 4159 | } |
4160 | } | |
4161 | break; | |
4162 | ||
4163 | default: | |
4164 | gcc_unreachable (); | |
51ef3909 | 4165 | } |
51ef3909 | 4166 | |
c271bdb2 | 4167 | if (DECL_INITIAL (decl)) |
4168 | TREE_TYPE (DECL_INITIAL (decl)) = type; | |
4169 | ||
51ef3909 | 4170 | layout_decl (decl, 0); |
4171 | } | |
4172 | ||
4173 | if (TREE_CODE (decl) == VAR_DECL) | |
4174 | { | |
4287354c | 4175 | if (init && TREE_CODE (init) == CONSTRUCTOR) |
4176 | add_flexible_array_elts_to_size (decl, init); | |
4177 | ||
ee5b587b | 4178 | if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node |
4179 | && COMPLETE_TYPE_P (TREE_TYPE (decl))) | |
42aee427 | 4180 | layout_decl (decl, 0); |
4181 | ||
5905b12b | 4182 | if (DECL_SIZE (decl) == 0 |
ee5b587b | 4183 | /* Don't give an error if we already gave one earlier. */ |
4184 | && TREE_TYPE (decl) != error_mark_node | |
5905b12b | 4185 | && (TREE_STATIC (decl) |
b2c4af5e | 4186 | /* A static variable with an incomplete type |
4187 | is an error if it is initialized. | |
4188 | Also if it is not file scope. | |
4189 | Otherwise, let it through, but if it is not `extern' | |
4190 | then it may cause an error message later. */ | |
4191 | ? (DECL_INITIAL (decl) != 0 | |
3a2bf8d3 | 4192 | || !DECL_FILE_SCOPE_P (decl)) |
b2c4af5e | 4193 | /* An automatic variable with an incomplete type |
4194 | is an error. */ | |
4195 | : !DECL_EXTERNAL (decl))) | |
4196 | { | |
3cf8b391 | 4197 | error ("storage size of %q+D isn%'t known", decl); |
b2c4af5e | 4198 | TREE_TYPE (decl) = error_mark_node; |
4199 | } | |
51ef3909 | 4200 | |
5e58c22e | 4201 | if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl)) |
ad5a5207 | 4202 | && DECL_SIZE (decl) != 0) |
d645d7e9 | 4203 | { |
4204 | if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST) | |
4205 | constant_expression_warning (DECL_SIZE (decl)); | |
4206 | else | |
1f93c018 | 4207 | { |
4208 | error ("storage size of %q+D isn%'t constant", decl); | |
4209 | TREE_TYPE (decl) = error_mark_node; | |
4210 | } | |
d645d7e9 | 4211 | } |
0dbd1c74 | 4212 | |
4214af46 | 4213 | if (TREE_USED (type)) |
0dbd1c74 | 4214 | TREE_USED (decl) = 1; |
51ef3909 | 4215 | } |
4216 | ||
d459e0d8 | 4217 | /* If this is a function and an assembler name is specified, reset DECL_RTL |
4218 | so we can give it its new name. Also, update built_in_decls if it | |
4219 | was a normal built-in. */ | |
3eee62d8 | 4220 | if (TREE_CODE (decl) == FUNCTION_DECL && asmspec) |
4214af46 | 4221 | { |
d459e0d8 | 4222 | if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL) |
46a7e216 | 4223 | set_builtin_user_assembler_name (decl, asmspec); |
b2c4af5e | 4224 | set_user_assembler_name (decl, asmspec); |
4214af46 | 4225 | } |
3eee62d8 | 4226 | |
418089c3 | 4227 | /* If #pragma weak was used, mark the decl weak now. */ |
3656266b | 4228 | maybe_apply_pragma_weak (decl); |
418089c3 | 4229 | |
51ef3909 | 4230 | /* Output the assembler code and/or RTL code for variables and functions, |
4231 | unless the type is an undefined structure or union. | |
4232 | If not, it will get done when the type is completed. */ | |
4233 | ||
4234 | if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL) | |
4235 | { | |
4a2849cb | 4236 | /* Determine the ELF visibility. */ |
4237 | if (TREE_PUBLIC (decl)) | |
4238 | c_determine_visibility (decl); | |
4239 | ||
952e555e | 4240 | /* This is a no-op in c-lang.c or something real in objc-act.c. */ |
c0f19401 | 4241 | if (c_dialect_objc ()) |
952e555e | 4242 | objc_check_decl (decl); |
e41f0d80 | 4243 | |
a0c938f0 | 4244 | if (asmspec) |
b2c4af5e | 4245 | { |
4246 | /* If this is not a static variable, issue a warning. | |
4247 | It doesn't make any sense to give an ASMSPEC for an | |
4248 | ordinary, non-register local variable. Historically, | |
4249 | GCC has accepted -- but ignored -- the ASMSPEC in | |
4250 | this case. */ | |
84166705 | 4251 | if (!DECL_FILE_SCOPE_P (decl) |
b2c4af5e | 4252 | && TREE_CODE (decl) == VAR_DECL |
4253 | && !C_DECL_REGISTER (decl) | |
4254 | && !TREE_STATIC (decl)) | |
3cf8b391 | 4255 | warning (0, "ignoring asm-specifier for non-static local " |
4256 | "variable %q+D", decl); | |
b2c4af5e | 4257 | else |
4258 | set_user_assembler_name (decl, asmspec); | |
4259 | } | |
a0c938f0 | 4260 | |
3a2bf8d3 | 4261 | if (DECL_FILE_SCOPE_P (decl)) |
0986aa2c | 4262 | { |
4263 | if (DECL_INITIAL (decl) == NULL_TREE | |
4264 | || DECL_INITIAL (decl) == error_mark_node) | |
4265 | /* Don't output anything | |
4266 | when a tentative file-scope definition is seen. | |
4267 | But at end of compilation, do output code for them. */ | |
4268 | DECL_DEFER_OUTPUT (decl) = 1; | |
b2c4af5e | 4269 | rest_of_decl_compilation (decl, true, 0); |
0986aa2c | 4270 | } |
e41f0d80 | 4271 | else |
4272 | { | |
b2c4af5e | 4273 | /* In conjunction with an ASMSPEC, the `register' |
4274 | keyword indicates that we should place the variable | |
4275 | in a particular register. */ | |
4276 | if (asmspec && C_DECL_REGISTER (decl)) | |
ace65efd | 4277 | { |
b2c4af5e | 4278 | DECL_HARD_REGISTER (decl) = 1; |
4279 | /* This cannot be done for a structure with volatile | |
4280 | fields, on which DECL_REGISTER will have been | |
4281 | reset. */ | |
4282 | if (!DECL_REGISTER (decl)) | |
4283 | error ("cannot put object with volatile field into register"); | |
ace65efd | 4284 | } |
cd5abf58 | 4285 | |
baf262a5 | 4286 | if (TREE_CODE (decl) != FUNCTION_DECL) |
2e3f4877 | 4287 | { |
4288 | /* If we're building a variable sized type, and we might be | |
4289 | reachable other than via the top of the current binding | |
4290 | level, then create a new BIND_EXPR so that we deallocate | |
4291 | the object at the right time. */ | |
4292 | /* Note that DECL_SIZE can be null due to errors. */ | |
4293 | if (DECL_SIZE (decl) | |
4294 | && !TREE_CONSTANT (DECL_SIZE (decl)) | |
4295 | && STATEMENT_LIST_HAS_LABEL (cur_stmt_list)) | |
4296 | { | |
4297 | tree bind; | |
14ae0310 | 4298 | bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL); |
2e3f4877 | 4299 | TREE_SIDE_EFFECTS (bind) = 1; |
4300 | add_stmt (bind); | |
4301 | BIND_EXPR_BODY (bind) = push_stmt_list (); | |
4302 | } | |
e60a6f7b | 4303 | add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), |
4304 | DECL_EXPR, decl)); | |
2e3f4877 | 4305 | } |
e41f0d80 | 4306 | } |
a0c938f0 | 4307 | |
f8b540f2 | 4308 | |
3a2bf8d3 | 4309 | if (!DECL_FILE_SCOPE_P (decl)) |
51ef3909 | 4310 | { |
4311 | /* Recompute the RTL of a local array now | |
4312 | if it used to be an incomplete type. */ | |
4313 | if (was_incomplete | |
84166705 | 4314 | && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl)) |
51ef3909 | 4315 | { |
4316 | /* If we used it already as memory, it must stay in memory. */ | |
4317 | TREE_ADDRESSABLE (decl) = TREE_USED (decl); | |
4318 | /* If it's still incomplete now, no init will save it. */ | |
4319 | if (DECL_SIZE (decl) == 0) | |
4320 | DECL_INITIAL (decl) = 0; | |
51ef3909 | 4321 | } |
51ef3909 | 4322 | } |
4323 | } | |
4324 | ||
4325 | if (TREE_CODE (decl) == TYPE_DECL) | |
ab7083b0 | 4326 | { |
4327 | if (!DECL_FILE_SCOPE_P (decl) | |
1f8a6ff8 | 4328 | && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) |
e60a6f7b | 4329 | add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl)); |
ab7083b0 | 4330 | |
b2c4af5e | 4331 | rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0); |
ab7083b0 | 4332 | } |
51ef3909 | 4333 | |
51ef3909 | 4334 | /* At the end of a declaration, throw away any variable type sizes |
4335 | of types defined inside that declaration. There is no use | |
4336 | computing them in the following function definition. */ | |
393b349a | 4337 | if (current_scope == file_scope) |
51ef3909 | 4338 | get_pending_sizes (); |
7acb29a3 | 4339 | |
4340 | /* Install a cleanup (aka destructor) if one was given. */ | |
4341 | if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl)) | |
4342 | { | |
4343 | tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl)); | |
4344 | if (attr) | |
4345 | { | |
7acb29a3 | 4346 | tree cleanup_id = TREE_VALUE (TREE_VALUE (attr)); |
4347 | tree cleanup_decl = lookup_name (cleanup_id); | |
4348 | tree cleanup; | |
b9c74b4d | 4349 | VEC(tree,gc) *vec; |
7acb29a3 | 4350 | |
4351 | /* Build "cleanup(&decl)" for the destructor. */ | |
b6889cb0 | 4352 | cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0); |
b9c74b4d | 4353 | vec = VEC_alloc (tree, gc, 1); |
4354 | VEC_quick_push (tree, vec, cleanup); | |
e60a6f7b | 4355 | cleanup = build_function_call_vec (DECL_SOURCE_LOCATION (decl), |
4356 | cleanup_decl, vec, NULL); | |
b9c74b4d | 4357 | VEC_free (tree, gc, vec); |
7acb29a3 | 4358 | |
4359 | /* Don't warn about decl unused; the cleanup uses it. */ | |
4360 | TREE_USED (decl) = 1; | |
2363ef00 | 4361 | TREE_USED (cleanup_decl) = 1; |
7acb29a3 | 4362 | |
4363 | /* Initialize EH, if we've been told to do so. */ | |
96faf93e | 4364 | c_maybe_initialize_eh (); |
7acb29a3 | 4365 | |
2363ef00 | 4366 | push_cleanup (decl, cleanup, false); |
7acb29a3 | 4367 | } |
4368 | } | |
1a7c0ccb | 4369 | |
4370 | if (warn_cxx_compat | |
4371 | && TREE_CODE (decl) == VAR_DECL | |
4372 | && TREE_READONLY (decl) | |
4373 | && !DECL_EXTERNAL (decl) | |
4374 | && DECL_INITIAL (decl) == NULL_TREE) | |
4375 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat, | |
4376 | "uninitialized const %qD is invalid in C++", decl); | |
51ef3909 | 4377 | } |
4378 | ||
7c42cc36 | 4379 | /* Given a parsed parameter declaration, decode it into a PARM_DECL. */ |
4380 | ||
4381 | tree | |
ac206aff | 4382 | grokparm (const struct c_parm *parm) |
7c42cc36 | 4383 | { |
e47ffaae | 4384 | tree attrs = parm->attrs; |
ac206aff | 4385 | tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, |
a75b1c71 | 4386 | NULL, &attrs, NULL, NULL, DEPRECATED_NORMAL); |
7c42cc36 | 4387 | |
e47ffaae | 4388 | decl_attributes (&decl, attrs, 0); |
7c42cc36 | 4389 | |
4390 | return decl; | |
4391 | } | |
4392 | ||
f74be9a1 | 4393 | /* Given a parsed parameter declaration, decode it into a PARM_DECL |
4394 | and push that on the current scope. */ | |
51ef3909 | 4395 | |
4396 | void | |
ac206aff | 4397 | push_parm_decl (const struct c_parm *parm) |
51ef3909 | 4398 | { |
e47ffaae | 4399 | tree attrs = parm->attrs; |
13b566b4 | 4400 | tree decl; |
b3924a2c | 4401 | |
81f218ec | 4402 | decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL, |
a75b1c71 | 4403 | &attrs, NULL, NULL, DEPRECATED_NORMAL); |
e47ffaae | 4404 | decl_attributes (&decl, attrs, 0); |
195f9646 | 4405 | |
51ef3909 | 4406 | decl = pushdecl (decl); |
4407 | ||
e60a6f7b | 4408 | finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE); |
51ef3909 | 4409 | } |
4410 | ||
393b349a | 4411 | /* Mark all the parameter declarations to date as forward decls. |
3bdb6310 | 4412 | Also diagnose use of this extension. */ |
51ef3909 | 4413 | |
4414 | void | |
f74be9a1 | 4415 | mark_forward_parm_decls (void) |
51ef3909 | 4416 | { |
393b349a | 4417 | struct c_binding *b; |
f74be9a1 | 4418 | |
4419 | if (pedantic && !current_scope->warned_forward_parm_decls) | |
4420 | { | |
21ca8540 | 4421 | pedwarn (input_location, OPT_pedantic, |
4422 | "ISO C forbids forward parameter declarations"); | |
f74be9a1 | 4423 | current_scope->warned_forward_parm_decls = true; |
4424 | } | |
4425 | ||
393b349a | 4426 | for (b = current_scope->bindings; b; b = b->prev) |
4427 | if (TREE_CODE (b->decl) == PARM_DECL) | |
4428 | TREE_ASM_WRITTEN (b->decl) = 1; | |
51ef3909 | 4429 | } |
4430 | \f | |
ec11e38e | 4431 | /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound |
4432 | literal, which may be an incomplete array type completed by the | |
e60a6f7b | 4433 | initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound |
a75b1c71 | 4434 | literal. NON_CONST is true if the initializers contain something |
4435 | that cannot occur in a constant expression. */ | |
ec11e38e | 4436 | |
4437 | tree | |
e60a6f7b | 4438 | build_compound_literal (location_t loc, tree type, tree init, bool non_const) |
ec11e38e | 4439 | { |
4440 | /* We do not use start_decl here because we have a type, not a declarator; | |
4441 | and do not use finish_decl because the decl should be stored inside | |
7dd37241 | 4442 | the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */ |
5cbd179d | 4443 | tree decl; |
ec11e38e | 4444 | tree complit; |
fccd796a | 4445 | tree stmt; |
5cbd179d | 4446 | |
4447 | if (type == error_mark_node) | |
4448 | return error_mark_node; | |
4449 | ||
e60a6f7b | 4450 | decl = build_decl (loc, VAR_DECL, NULL_TREE, type); |
ec11e38e | 4451 | DECL_EXTERNAL (decl) = 0; |
4452 | TREE_PUBLIC (decl) = 0; | |
393b349a | 4453 | TREE_STATIC (decl) = (current_scope == file_scope); |
ec11e38e | 4454 | DECL_CONTEXT (decl) = current_function_decl; |
4455 | TREE_USED (decl) = 1; | |
4456 | TREE_TYPE (decl) = type; | |
66d12a6c | 4457 | TREE_READONLY (decl) = TYPE_READONLY (type); |
e60a6f7b | 4458 | store_init_value (loc, decl, init, NULL_TREE); |
ec11e38e | 4459 | |
4460 | if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type)) | |
4461 | { | |
c271bdb2 | 4462 | int failure = complete_array_type (&TREE_TYPE (decl), |
4463 | DECL_INITIAL (decl), true); | |
231bd014 | 4464 | gcc_assert (!failure); |
c271bdb2 | 4465 | |
4466 | type = TREE_TYPE (decl); | |
4467 | TREE_TYPE (DECL_INITIAL (decl)) = type; | |
ec11e38e | 4468 | } |
4469 | ||
ec11e38e | 4470 | if (type == error_mark_node || !COMPLETE_TYPE_P (type)) |
4471 | return error_mark_node; | |
4472 | ||
e60a6f7b | 4473 | stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl); |
c271bdb2 | 4474 | complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt); |
ec11e38e | 4475 | TREE_SIDE_EFFECTS (complit) = 1; |
4476 | ||
4477 | layout_decl (decl, 0); | |
4478 | ||
4479 | if (TREE_STATIC (decl)) | |
4480 | { | |
79b01846 | 4481 | /* This decl needs a name for the assembler output. */ |
4482 | set_compound_literal_name (decl); | |
9a7bab7f | 4483 | DECL_DEFER_OUTPUT (decl) = 1; |
4484 | DECL_COMDAT (decl) = 1; | |
4485 | DECL_ARTIFICIAL (decl) = 1; | |
553acd9c | 4486 | DECL_IGNORED_P (decl) = 1; |
9a7bab7f | 4487 | pushdecl (decl); |
b2c4af5e | 4488 | rest_of_decl_compilation (decl, 1, 0); |
ec11e38e | 4489 | } |
4490 | ||
a75b1c71 | 4491 | if (non_const) |
4492 | { | |
4493 | complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit); | |
4494 | C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1; | |
4495 | } | |
4496 | ||
ec11e38e | 4497 | return complit; |
4498 | } | |
0b09525f | 4499 | |
4500 | /* Check the type of a compound literal. Here we just check that it | |
4501 | is valid for C++. */ | |
4502 | ||
4503 | void | |
e60a6f7b | 4504 | check_compound_literal_type (location_t loc, struct c_type_name *type_name) |
0b09525f | 4505 | { |
4506 | if (warn_cxx_compat && type_name->specs->tag_defined_p) | |
4507 | warning_at (loc, OPT_Wc___compat, | |
4508 | "defining a type in a compound literal is invalid in C++"); | |
4509 | } | |
ec11e38e | 4510 | \f |
ce09bc13 | 4511 | /* Determine whether TYPE is a structure with a flexible array member, |
4512 | or a union containing such a structure (possibly recursively). */ | |
4513 | ||
4514 | static bool | |
1cae46be | 4515 | flexible_array_type_p (tree type) |
ce09bc13 | 4516 | { |
4517 | tree x; | |
4518 | switch (TREE_CODE (type)) | |
4519 | { | |
4520 | case RECORD_TYPE: | |
4521 | x = TYPE_FIELDS (type); | |
4522 | if (x == NULL_TREE) | |
4523 | return false; | |
4524 | while (TREE_CHAIN (x) != NULL_TREE) | |
4525 | x = TREE_CHAIN (x); | |
4526 | if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE | |
4527 | && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE | |
4528 | && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE | |
4529 | && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE) | |
4530 | return true; | |
4531 | return false; | |
4532 | case UNION_TYPE: | |
4533 | for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x)) | |
4534 | { | |
4535 | if (flexible_array_type_p (TREE_TYPE (x))) | |
4536 | return true; | |
4537 | } | |
4538 | return false; | |
4539 | default: | |
4540 | return false; | |
4541 | } | |
4542 | } | |
4543 | \f | |
2d1a2840 | 4544 | /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME, |
4545 | replacing with appropriate values if they are invalid. */ | |
4546 | static void | |
d1dd9ac0 | 4547 | check_bitfield_type_and_width (tree *type, tree *width, tree orig_name) |
2d1a2840 | 4548 | { |
4549 | tree type_mv; | |
4550 | unsigned int max_width; | |
4551 | unsigned HOST_WIDE_INT w; | |
d1dd9ac0 | 4552 | const char *name = (orig_name |
4553 | ? identifier_to_locale (IDENTIFIER_POINTER (orig_name)) | |
4554 | : _("<anonymous>")); | |
2d1a2840 | 4555 | |
2d1a2840 | 4556 | /* Detect and ignore out of range field width and process valid |
4557 | field widths. */ | |
aaceaa0f | 4558 | if (!INTEGRAL_TYPE_P (TREE_TYPE (*width)) |
4559 | || TREE_CODE (*width) != INTEGER_CST) | |
2d1a2840 | 4560 | { |
b0b1af64 | 4561 | error ("bit-field %qs width not an integer constant", name); |
2d1a2840 | 4562 | *width = integer_one_node; |
4563 | } | |
4564 | else | |
4565 | { | |
4566 | constant_expression_warning (*width); | |
4567 | if (tree_int_cst_sgn (*width) < 0) | |
4568 | { | |
b0b1af64 | 4569 | error ("negative width in bit-field %qs", name); |
2d1a2840 | 4570 | *width = integer_one_node; |
4571 | } | |
4572 | else if (integer_zerop (*width) && orig_name) | |
4573 | { | |
b0b1af64 | 4574 | error ("zero width for bit-field %qs", name); |
2d1a2840 | 4575 | *width = integer_one_node; |
4576 | } | |
4577 | } | |
4578 | ||
4579 | /* Detect invalid bit-field type. */ | |
4580 | if (TREE_CODE (*type) != INTEGER_TYPE | |
4581 | && TREE_CODE (*type) != BOOLEAN_TYPE | |
4582 | && TREE_CODE (*type) != ENUMERAL_TYPE) | |
4583 | { | |
b0b1af64 | 4584 | error ("bit-field %qs has invalid type", name); |
2d1a2840 | 4585 | *type = unsigned_type_node; |
4586 | } | |
4587 | ||
4588 | type_mv = TYPE_MAIN_VARIANT (*type); | |
8864917d | 4589 | if (!in_system_header |
2d1a2840 | 4590 | && type_mv != integer_type_node |
4591 | && type_mv != unsigned_type_node | |
891e084d | 4592 | && type_mv != boolean_type_node) |
21ca8540 | 4593 | pedwarn (input_location, OPT_pedantic, |
4594 | "type of bit-field %qs is a GCC extension", name); | |
2d1a2840 | 4595 | |
c17154eb | 4596 | max_width = TYPE_PRECISION (*type); |
2d1a2840 | 4597 | |
4598 | if (0 < compare_tree_int (*width, max_width)) | |
4599 | { | |
b0b1af64 | 4600 | error ("width of %qs exceeds its type", name); |
2d1a2840 | 4601 | w = max_width; |
7016c612 | 4602 | *width = build_int_cst (NULL_TREE, w); |
2d1a2840 | 4603 | } |
4604 | else | |
4605 | w = tree_low_cst (*width, 1); | |
4606 | ||
4ee9c684 | 4607 | if (TREE_CODE (*type) == ENUMERAL_TYPE) |
4608 | { | |
4609 | struct lang_type *lt = TYPE_LANG_SPECIFIC (*type); | |
14338e9a | 4610 | if (!lt |
5485b959 | 4611 | || w < tree_int_cst_min_precision (lt->enum_min, TYPE_UNSIGNED (*type)) |
4612 | || w < tree_int_cst_min_precision (lt->enum_max, TYPE_UNSIGNED (*type))) | |
c3ceba8e | 4613 | warning (0, "%qs is narrower than values of its type", name); |
4ee9c684 | 4614 | } |
2d1a2840 | 4615 | } |
2ac1e110 | 4616 | |
2d1a2840 | 4617 | \f |
aaafd660 | 4618 | |
4619 | /* Print warning about variable length array if necessary. */ | |
4620 | ||
4621 | static void | |
d1dd9ac0 | 4622 | warn_variable_length_array (tree name, tree size) |
aaafd660 | 4623 | { |
aaafd660 | 4624 | int const_size = TREE_CONSTANT (size); |
4625 | ||
8864917d | 4626 | if (!flag_isoc99 && pedantic && warn_vla != 0) |
aaafd660 | 4627 | { |
4628 | if (const_size) | |
4629 | { | |
4630 | if (name) | |
d1dd9ac0 | 4631 | pedwarn (input_location, OPT_Wvla, |
4632 | "ISO C90 forbids array %qE whose size " | |
aaafd660 | 4633 | "can%'t be evaluated", |
4634 | name); | |
4635 | else | |
21ca8540 | 4636 | pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array whose size " |
aaafd660 | 4637 | "can%'t be evaluated"); |
4638 | } | |
4639 | else | |
4640 | { | |
4641 | if (name) | |
d1dd9ac0 | 4642 | pedwarn (input_location, OPT_Wvla, |
4643 | "ISO C90 forbids variable length array %qE", | |
aaafd660 | 4644 | name); |
4645 | else | |
21ca8540 | 4646 | pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array"); |
aaafd660 | 4647 | } |
4648 | } | |
4649 | else if (warn_vla > 0) | |
4650 | { | |
4651 | if (const_size) | |
4652 | { | |
4653 | if (name) | |
4654 | warning (OPT_Wvla, | |
d1dd9ac0 | 4655 | "the size of array %qE can" |
aaafd660 | 4656 | "%'t be evaluated", name); |
4657 | else | |
4658 | warning (OPT_Wvla, | |
4659 | "the size of array can %'t be evaluated"); | |
4660 | } | |
4661 | else | |
4662 | { | |
4663 | if (name) | |
4664 | warning (OPT_Wvla, | |
d1dd9ac0 | 4665 | "variable length array %qE is used", |
aaafd660 | 4666 | name); |
4667 | else | |
4668 | warning (OPT_Wvla, | |
4669 | "variable length array is used"); | |
4670 | } | |
4671 | } | |
4672 | } | |
4673 | ||
7fc1e5fb | 4674 | /* Given a size SIZE that may not be a constant, return a SAVE_EXPR to |
4675 | serve as the actual size-expression for a type or decl. This is | |
4676 | like variable_size in stor-layout.c, but we make global_bindings_p | |
4677 | return negative to avoid calls to that function from outside the | |
4678 | front end resulting in errors at file scope, then call this version | |
4679 | instead from front-end code. */ | |
4680 | ||
4681 | static tree | |
4682 | c_variable_size (tree size) | |
4683 | { | |
4684 | tree save; | |
4685 | ||
4686 | if (TREE_CONSTANT (size)) | |
4687 | return size; | |
4688 | ||
4689 | size = save_expr (size); | |
4690 | ||
4691 | save = skip_simple_arithmetic (size); | |
4692 | ||
4693 | if (cfun && cfun->dont_save_pending_sizes_p) | |
4694 | return size; | |
4695 | ||
4696 | if (!global_bindings_p ()) | |
4697 | put_pending_size (save); | |
4698 | ||
4699 | return size; | |
4700 | } | |
4701 | ||
51ef3909 | 4702 | /* Given declspecs and a declarator, |
4703 | determine the name and type of the object declared | |
4704 | and construct a ..._DECL node for it. | |
4705 | (In one case we can return a ..._TYPE node instead. | |
4706 | For invalid input we sometimes return 0.) | |
4707 | ||
9553111d | 4708 | DECLSPECS is a c_declspecs structure for the declaration specifiers. |
51ef3909 | 4709 | |
4710 | DECL_CONTEXT says which syntactic context this declaration is in: | |
4711 | NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL. | |
4712 | FUNCDEF for a function definition. Like NORMAL but a few different | |
4713 | error messages in each case. Return value may be zero meaning | |
4714 | this definition is too screwy to try to parse. | |
4715 | PARM for a parameter declaration (either within a function prototype | |
4716 | or before a function body). Make a PARM_DECL, or return void_type_node. | |
4717 | TYPENAME if for a typename (in a cast or sizeof). | |
4718 | Don't make a DECL node; just return the ..._TYPE node. | |
4719 | FIELD for a struct or union field; make a FIELD_DECL. | |
4a125bfc | 4720 | INITIALIZED is true if the decl has an initializer. |
2d1a2840 | 4721 | WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node |
4722 | representing the width of the bit-field. | |
e47ffaae | 4723 | DECL_ATTRS points to the list of attributes that should be added to this |
4724 | decl. Any nested attributes that belong on the decl itself will be | |
4725 | added to this list. | |
a75b1c71 | 4726 | If EXPR is not NULL, any expressions that need to be evaluated as |
4727 | part of evaluating variably modified types will be stored in *EXPR. | |
4728 | If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be | |
4729 | set to indicate whether operands in *EXPR can be used in constant | |
4730 | expressions. | |
81f218ec | 4731 | DEPRECATED_STATE is a deprecated_states value indicating whether |
4732 | deprecation warnings should be suppressed. | |
51ef3909 | 4733 | |
4734 | In the TYPENAME case, DECLARATOR is really an absolute declarator. | |
4735 | It may also be so in the PARM case, for a prototype where the | |
4736 | argument type is specified but not the name. | |
4737 | ||
4738 | This function is where the complicated C meanings of `static' | |
08f8d953 | 4739 | and `extern' are interpreted. */ |
51ef3909 | 4740 | |
4741 | static tree | |
9553111d | 4742 | grokdeclarator (const struct c_declarator *declarator, |
4743 | struct c_declspecs *declspecs, | |
81f218ec | 4744 | enum decl_context decl_context, bool initialized, tree *width, |
a75b1c71 | 4745 | tree *decl_attrs, tree *expr, bool *expr_const_operands, |
4746 | enum deprecated_states deprecated_state) | |
51ef3909 | 4747 | { |
9553111d | 4748 | tree type = declspecs->type; |
feb04535 | 4749 | bool threadp = declspecs->thread_p; |
4750 | enum c_storage_class storage_class = declspecs->storage_class; | |
51ef3909 | 4751 | int constp; |
a5b1863e | 4752 | int restrictp; |
51ef3909 | 4753 | int volatilep; |
a5b1863e | 4754 | int type_quals = TYPE_UNQUALIFIED; |
d1dd9ac0 | 4755 | tree name = NULL_TREE; |
32d33ab2 | 4756 | bool funcdef_flag = false; |
ac206aff | 4757 | bool funcdef_syntax = false; |
b99f3c92 | 4758 | bool size_varies = false; |
70dd11f7 | 4759 | tree decl_attr = declspecs->decl_attr; |
bb476216 | 4760 | int array_ptr_quals = TYPE_UNQUALIFIED; |
4761 | tree array_ptr_attrs = NULL_TREE; | |
1fd94215 | 4762 | int array_parm_static = 0; |
32d33ab2 | 4763 | bool array_parm_vla_unspec_p = false; |
e3c541f0 | 4764 | tree returned_attrs = NULL_TREE; |
2d1a2840 | 4765 | bool bitfield = width != NULL; |
0b351ac2 | 4766 | tree element_type; |
ac206aff | 4767 | struct c_arg_info *arg_info = 0; |
e60a6f7b | 4768 | location_t loc = UNKNOWN_LOCATION; |
2b3c93a3 | 4769 | const char *errmsg; |
a75b1c71 | 4770 | tree expr_dummy; |
4771 | bool expr_const_operands_dummy; | |
4772 | ||
4773 | if (expr == NULL) | |
4774 | expr = &expr_dummy; | |
4775 | if (expr_const_operands == NULL) | |
4776 | expr_const_operands = &expr_const_operands_dummy; | |
4777 | ||
4778 | *expr = declspecs->expr; | |
4779 | *expr_const_operands = declspecs->expr_const_operands; | |
51ef3909 | 4780 | |
4781 | if (decl_context == FUNCDEF) | |
32d33ab2 | 4782 | funcdef_flag = true, decl_context = NORMAL; |
51ef3909 | 4783 | |
51ef3909 | 4784 | /* Look inside a declarator for the name being declared |
d1dd9ac0 | 4785 | and get it as an IDENTIFIER_NODE, for an error message. */ |
51ef3909 | 4786 | { |
ac206aff | 4787 | const struct c_declarator *decl = declarator; |
51ef3909 | 4788 | |
4789 | while (decl) | |
ac206aff | 4790 | switch (decl->kind) |
51ef3909 | 4791 | { |
ac206aff | 4792 | case cdk_array: |
e60a6f7b | 4793 | loc = decl->id_loc; |
4794 | /* FALL THRU. */ | |
4795 | ||
4796 | case cdk_function: | |
ac206aff | 4797 | case cdk_pointer: |
4798 | funcdef_syntax = (decl->kind == cdk_function); | |
4799 | decl = decl->declarator; | |
51ef3909 | 4800 | break; |
4801 | ||
ac206aff | 4802 | case cdk_attrs: |
4803 | decl = decl->declarator; | |
e3c541f0 | 4804 | break; |
4805 | ||
ac206aff | 4806 | case cdk_id: |
e60a6f7b | 4807 | loc = decl->id_loc; |
ac206aff | 4808 | if (decl->u.id) |
d1dd9ac0 | 4809 | name = decl->u.id; |
51ef3909 | 4810 | decl = 0; |
4811 | break; | |
4812 | ||
4813 | default: | |
231bd014 | 4814 | gcc_unreachable (); |
51ef3909 | 4815 | } |
4816 | if (name == 0) | |
d1dd9ac0 | 4817 | { |
4818 | gcc_assert (decl_context == PARM | |
4819 | || decl_context == TYPENAME | |
4820 | || (decl_context == FIELD | |
4821 | && declarator->kind == cdk_id)); | |
4822 | gcc_assert (!initialized); | |
4823 | } | |
51ef3909 | 4824 | } |
4825 | ||
4826 | /* A function definition's declarator must have the form of | |
4827 | a function declarator. */ | |
4828 | ||
ac206aff | 4829 | if (funcdef_flag && !funcdef_syntax) |
51ef3909 | 4830 | return 0; |
4831 | ||
51ef3909 | 4832 | /* If this looks like a function definition, make it one, |
4833 | even if it occurs where parms are expected. | |
4834 | Then store_parm_decls will reject it and not use it as a parm. */ | |
393b349a | 4835 | if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag) |
51ef3909 | 4836 | decl_context = PARM; |
4837 | ||
9553111d | 4838 | if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS) |
45c4e798 | 4839 | warn_deprecated_use (declspecs->type, declspecs->decl_attr); |
51ef3909 | 4840 | |
dc95eae2 | 4841 | if ((decl_context == NORMAL || decl_context == FIELD) |
4842 | && current_scope == file_scope | |
4843 | && variably_modified_type_p (type, NULL_TREE)) | |
4844 | { | |
d1dd9ac0 | 4845 | if (name) |
e60a6f7b | 4846 | error_at (loc, "variably modified %qE at file scope", name); |
d1dd9ac0 | 4847 | else |
e60a6f7b | 4848 | error_at (loc, "variably modified field at file scope"); |
dc95eae2 | 4849 | type = integer_type_node; |
4850 | } | |
4851 | ||
b99f3c92 | 4852 | size_varies = C_TYPE_VARIABLE_SIZE (type) != 0; |
51ef3909 | 4853 | |
70dd11f7 | 4854 | /* Diagnose defaulting to "int". */ |
65a8b580 | 4855 | |
70dd11f7 | 4856 | if (declspecs->default_int_p && !in_system_header) |
51ef3909 | 4857 | { |
70dd11f7 | 4858 | /* Issue a warning if this is an ISO C 99 program or if |
4859 | -Wreturn-type and this is a function, or if -Wimplicit; | |
4860 | prefer the former warning since it is more explicit. */ | |
4861 | if ((warn_implicit_int || warn_return_type || flag_isoc99) | |
4862 | && funcdef_flag) | |
4863 | warn_about_return_type = 1; | |
d1dd9ac0 | 4864 | else |
4865 | { | |
4866 | if (name) | |
e60a6f7b | 4867 | pedwarn_c99 (loc, flag_isoc99 ? 0 : OPT_Wimplicit_int, |
d1dd9ac0 | 4868 | "type defaults to %<int%> in declaration of %qE", |
4869 | name); | |
4870 | else | |
4871 | pedwarn_c99 (input_location, flag_isoc99 ? 0 : OPT_Wimplicit_int, | |
4872 | "type defaults to %<int%> in type name"); | |
4873 | } | |
51ef3909 | 4874 | } |
4875 | ||
70dd11f7 | 4876 | /* Adjust the type if a bit-field is being declared, |
4877 | -funsigned-bitfields applied and the type is not explicitly | |
4878 | "signed". */ | |
4879 | if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p | |
4880 | && TREE_CODE (type) == INTEGER_TYPE) | |
75a70cf9 | 4881 | type = unsigned_type_for (type); |
51ef3909 | 4882 | |
a5b1863e | 4883 | /* Figure out the type qualifiers for the declaration. There are |
4884 | two ways a declaration can become qualified. One is something | |
4885 | like `const int i' where the `const' is explicit. Another is | |
4886 | something like `typedef const int CI; CI i' where the type of the | |
0b351ac2 | 4887 | declaration contains the `const'. A third possibility is that |
4888 | there is a type qualifier on the element type of a typedefed | |
4889 | array type, in which case we should extract that qualifier so | |
333adf28 | 4890 | that c_apply_type_quals_to_decl receives the full list of |
0b351ac2 | 4891 | qualifiers to work with (C90 is not entirely clear about whether |
4892 | duplicate qualifiers should be diagnosed in this case, but it | |
4893 | seems most appropriate to do so). */ | |
4894 | element_type = strip_array_types (type); | |
bb476216 | 4895 | constp = declspecs->const_p + TYPE_READONLY (element_type); |
4896 | restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type); | |
4897 | volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type); | |
a7b87e06 | 4898 | if (pedantic && !flag_isoc99) |
4899 | { | |
4900 | if (constp > 1) | |
e60a6f7b | 4901 | pedwarn (loc, OPT_pedantic, "duplicate %<const%>"); |
a7b87e06 | 4902 | if (restrictp > 1) |
e60a6f7b | 4903 | pedwarn (loc, OPT_pedantic, "duplicate %<restrict%>"); |
a7b87e06 | 4904 | if (volatilep > 1) |
e60a6f7b | 4905 | pedwarn (loc, OPT_pedantic, "duplicate %<volatile%>"); |
a7b87e06 | 4906 | } |
aebc8537 | 4907 | if (!flag_gen_aux_info && (TYPE_QUALS (element_type))) |
51ef3909 | 4908 | type = TYPE_MAIN_VARIANT (type); |
a5b1863e | 4909 | type_quals = ((constp ? TYPE_QUAL_CONST : 0) |
4910 | | (restrictp ? TYPE_QUAL_RESTRICT : 0) | |
4911 | | (volatilep ? TYPE_QUAL_VOLATILE : 0)); | |
51ef3909 | 4912 | |
feb04535 | 4913 | /* Warn about storage classes that are invalid for certain |
4914 | kinds of declarations (parameters, typenames, etc.). */ | |
4915 | ||
4916 | if (funcdef_flag | |
4917 | && (threadp | |
4918 | || storage_class == csc_auto | |
4919 | || storage_class == csc_register | |
4920 | || storage_class == csc_typedef)) | |
4921 | { | |
8864917d | 4922 | if (storage_class == csc_auto) |
e60a6f7b | 4923 | pedwarn (loc, |
21ca8540 | 4924 | (current_scope == file_scope) ? 0 : OPT_pedantic, |
8864917d | 4925 | "function definition declared %<auto%>"); |
feb04535 | 4926 | if (storage_class == csc_register) |
e60a6f7b | 4927 | error_at (loc, "function definition declared %<register%>"); |
feb04535 | 4928 | if (storage_class == csc_typedef) |
e60a6f7b | 4929 | error_at (loc, "function definition declared %<typedef%>"); |
feb04535 | 4930 | if (threadp) |
e60a6f7b | 4931 | error_at (loc, "function definition declared %<__thread%>"); |
feb04535 | 4932 | threadp = false; |
4933 | if (storage_class == csc_auto | |
4934 | || storage_class == csc_register | |
4935 | || storage_class == csc_typedef) | |
4936 | storage_class = csc_none; | |
4937 | } | |
4938 | else if (decl_context != NORMAL && (storage_class != csc_none || threadp)) | |
4939 | { | |
4940 | if (decl_context == PARM && storage_class == csc_register) | |
4941 | ; | |
4942 | else | |
4943 | { | |
4944 | switch (decl_context) | |
4945 | { | |
4946 | case FIELD: | |
d1dd9ac0 | 4947 | if (name) |
e60a6f7b | 4948 | error_at (loc, "storage class specified for structure " |
4949 | "field %qE", name); | |
d1dd9ac0 | 4950 | else |
e60a6f7b | 4951 | error_at (loc, "storage class specified for structure field"); |
feb04535 | 4952 | break; |
4953 | case PARM: | |
d1dd9ac0 | 4954 | if (name) |
e60a6f7b | 4955 | error_at (loc, "storage class specified for parameter %qE", |
4956 | name); | |
d1dd9ac0 | 4957 | else |
e60a6f7b | 4958 | error_at (loc, "storage class specified for unnamed parameter"); |
feb04535 | 4959 | break; |
4960 | default: | |
e60a6f7b | 4961 | error_at (loc, "storage class specified for typename"); |
feb04535 | 4962 | break; |
4963 | } | |
4964 | storage_class = csc_none; | |
4965 | threadp = false; | |
4966 | } | |
4967 | } | |
4968 | else if (storage_class == csc_extern | |
4969 | && initialized | |
4970 | && !funcdef_flag) | |
4971 | { | |
4972 | /* 'extern' with initialization is invalid if not at file scope. */ | |
9096068a | 4973 | if (current_scope == file_scope) |
4974 | { | |
4975 | /* It is fine to have 'extern const' when compiling at C | |
4976 | and C++ intersection. */ | |
4977 | if (!(warn_cxx_compat && constp)) | |
e60a6f7b | 4978 | warning_at (loc, 0, "%qE initialized and declared %<extern%>", |
4979 | name); | |
9096068a | 4980 | } |
feb04535 | 4981 | else |
e60a6f7b | 4982 | error_at (loc, "%qE has both %<extern%> and initializer", name); |
feb04535 | 4983 | } |
4984 | else if (current_scope == file_scope) | |
4985 | { | |
4986 | if (storage_class == csc_auto) | |
e60a6f7b | 4987 | error_at (loc, "file-scope declaration of %qE specifies %<auto%>", |
4988 | name); | |
feb04535 | 4989 | if (pedantic && storage_class == csc_register) |
21ca8540 | 4990 | pedwarn (input_location, OPT_pedantic, |
d1dd9ac0 | 4991 | "file-scope declaration of %qE specifies %<register%>", name); |
feb04535 | 4992 | } |
4993 | else | |
4994 | { | |
4995 | if (storage_class == csc_extern && funcdef_flag) | |
e60a6f7b | 4996 | error_at (loc, "nested function %qE declared %<extern%>", name); |
feb04535 | 4997 | else if (threadp && storage_class == csc_none) |
4998 | { | |
e60a6f7b | 4999 | error_at (loc, "function-scope %qE implicitly auto and declared " |
5000 | "%<__thread%>", | |
5001 | name); | |
feb04535 | 5002 | threadp = false; |
5003 | } | |
5004 | } | |
51ef3909 | 5005 | |
5006 | /* Now figure out the structure of the declarator proper. | |
5007 | Descend through it, creating more complex types, until we reach | |
aebc8537 | 5008 | the declared identifier (or NULL_TREE, in an absolute declarator). |
5009 | At each stage we maintain an unqualified version of the type | |
5010 | together with any qualifiers that should be applied to it with | |
5011 | c_build_qualified_type; this way, array types including | |
5012 | multidimensional array types are first built up in unqualified | |
5013 | form and then the qualified form is created with | |
5014 | TYPE_MAIN_VARIANT pointing to the unqualified form. */ | |
51ef3909 | 5015 | |
ac206aff | 5016 | while (declarator && declarator->kind != cdk_id) |
51ef3909 | 5017 | { |
5018 | if (type == error_mark_node) | |
5019 | { | |
ac206aff | 5020 | declarator = declarator->declarator; |
51ef3909 | 5021 | continue; |
5022 | } | |
5023 | ||
ac206aff | 5024 | /* Each level of DECLARATOR is either a cdk_array (for ...[..]), |
5025 | a cdk_pointer (for *...), | |
5026 | a cdk_function (for ...(...)), | |
5027 | a cdk_attrs (for nested attributes), | |
5028 | or a cdk_id (for the name being declared | |
5029 | or the place in an absolute declarator | |
51ef3909 | 5030 | where the name was omitted). |
ac206aff | 5031 | For the last case, we have just exited the loop. |
51ef3909 | 5032 | |
5033 | At this point, TYPE is the type of elements of an array, | |
5034 | or for a function to return, or for a pointer to point to. | |
5035 | After this sequence of ifs, TYPE is the type of the | |
5036 | array or function or pointer, and DECLARATOR has had its | |
5037 | outermost layer removed. */ | |
5038 | ||
bb476216 | 5039 | if (array_ptr_quals != TYPE_UNQUALIFIED |
5040 | || array_ptr_attrs != NULL_TREE | |
5041 | || array_parm_static) | |
1fd94215 | 5042 | { |
5043 | /* Only the innermost declarator (making a parameter be of | |
5044 | array type which is converted to pointer type) | |
5045 | may have static or type qualifiers. */ | |
e60a6f7b | 5046 | error_at (loc, "static or type qualifiers in non-parameter array declarator"); |
bb476216 | 5047 | array_ptr_quals = TYPE_UNQUALIFIED; |
5048 | array_ptr_attrs = NULL_TREE; | |
1fd94215 | 5049 | array_parm_static = 0; |
5050 | } | |
5051 | ||
ac206aff | 5052 | switch (declarator->kind) |
51ef3909 | 5053 | { |
ac206aff | 5054 | case cdk_attrs: |
231bd014 | 5055 | { |
ac206aff | 5056 | /* A declarator with embedded attributes. */ |
5057 | tree attrs = declarator->u.attrs; | |
5058 | const struct c_declarator *inner_decl; | |
231bd014 | 5059 | int attr_flags = 0; |
ac206aff | 5060 | declarator = declarator->declarator; |
231bd014 | 5061 | inner_decl = declarator; |
ac206aff | 5062 | while (inner_decl->kind == cdk_attrs) |
5063 | inner_decl = inner_decl->declarator; | |
5064 | if (inner_decl->kind == cdk_id) | |
231bd014 | 5065 | attr_flags |= (int) ATTR_FLAG_DECL_NEXT; |
ac206aff | 5066 | else if (inner_decl->kind == cdk_function) |
231bd014 | 5067 | attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT; |
ac206aff | 5068 | else if (inner_decl->kind == cdk_array) |
231bd014 | 5069 | attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT; |
5070 | returned_attrs = decl_attributes (&type, | |
5071 | chainon (returned_attrs, attrs), | |
5072 | attr_flags); | |
5073 | break; | |
5074 | } | |
ac206aff | 5075 | case cdk_array: |
231bd014 | 5076 | { |
5077 | tree itype = NULL_TREE; | |
ac206aff | 5078 | tree size = declarator->u.array.dimen; |
231bd014 | 5079 | /* The index is a signed object `sizetype' bits wide. */ |
5080 | tree index_type = c_common_signed_type (sizetype); | |
5081 | ||
ac206aff | 5082 | array_ptr_quals = declarator->u.array.quals; |
bb476216 | 5083 | array_ptr_attrs = declarator->u.array.attrs; |
ac206aff | 5084 | array_parm_static = declarator->u.array.static_p; |
32d33ab2 | 5085 | array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p; |
5086 | ||
ac206aff | 5087 | declarator = declarator->declarator; |
231bd014 | 5088 | |
5089 | /* Check for some types that there cannot be arrays of. */ | |
a0c938f0 | 5090 | |
231bd014 | 5091 | if (VOID_TYPE_P (type)) |
5092 | { | |
d1dd9ac0 | 5093 | if (name) |
e60a6f7b | 5094 | error_at (loc, "declaration of %qE as array of voids", name); |
d1dd9ac0 | 5095 | else |
e60a6f7b | 5096 | error_at (loc, "declaration of type name as array of voids"); |
231bd014 | 5097 | type = error_mark_node; |
5098 | } | |
a0c938f0 | 5099 | |
231bd014 | 5100 | if (TREE_CODE (type) == FUNCTION_TYPE) |
5101 | { | |
d1dd9ac0 | 5102 | if (name) |
e60a6f7b | 5103 | error_at (loc, "declaration of %qE as array of functions", |
5104 | name); | |
d1dd9ac0 | 5105 | else |
e60a6f7b | 5106 | error_at (loc, "declaration of type name as array of " |
5107 | "functions"); | |
231bd014 | 5108 | type = error_mark_node; |
5109 | } | |
a0c938f0 | 5110 | |
231bd014 | 5111 | if (pedantic && !in_system_header && flexible_array_type_p (type)) |
e60a6f7b | 5112 | pedwarn (loc, OPT_pedantic, |
21ca8540 | 5113 | "invalid use of structure with flexible array member"); |
a0c938f0 | 5114 | |
231bd014 | 5115 | if (size == error_mark_node) |
51ef3909 | 5116 | type = error_mark_node; |
a0c938f0 | 5117 | |
231bd014 | 5118 | if (type == error_mark_node) |
5119 | continue; | |
0dbd1c74 | 5120 | |
231bd014 | 5121 | /* If size was specified, set ITYPE to a range-type for |
5122 | that size. Otherwise, ITYPE remains null. finish_decl | |
5123 | may figure it out from an initial value. */ | |
1b82e858 | 5124 | |
231bd014 | 5125 | if (size) |
5126 | { | |
a75b1c71 | 5127 | bool size_maybe_const = true; |
5128 | bool size_int_const = (TREE_CODE (size) == INTEGER_CST | |
5129 | && !TREE_OVERFLOW (size)); | |
5130 | bool this_size_varies = false; | |
5131 | ||
231bd014 | 5132 | /* Strip NON_LVALUE_EXPRs since we aren't using as an |
5133 | lvalue. */ | |
5134 | STRIP_TYPE_NOPS (size); | |
a0c938f0 | 5135 | |
84166705 | 5136 | if (!INTEGRAL_TYPE_P (TREE_TYPE (size))) |
231bd014 | 5137 | { |
d1dd9ac0 | 5138 | if (name) |
e60a6f7b | 5139 | error_at (loc, "size of array %qE has non-integer type", |
5140 | name); | |
d1dd9ac0 | 5141 | else |
e60a6f7b | 5142 | error_at (loc, |
5143 | "size of unnamed array has non-integer type"); | |
231bd014 | 5144 | size = integer_one_node; |
5145 | } | |
a0c938f0 | 5146 | |
a75b1c71 | 5147 | size = c_fully_fold (size, false, &size_maybe_const); |
5148 | ||
5149 | if (pedantic && size_maybe_const && integer_zerop (size)) | |
d1dd9ac0 | 5150 | { |
5151 | if (name) | |
e60a6f7b | 5152 | pedwarn (loc, OPT_pedantic, |
d1dd9ac0 | 5153 | "ISO C forbids zero-size array %qE", name); |
5154 | else | |
e60a6f7b | 5155 | pedwarn (loc, OPT_pedantic, |
d1dd9ac0 | 5156 | "ISO C forbids zero-size array"); |
5157 | } | |
a0c938f0 | 5158 | |
a75b1c71 | 5159 | if (TREE_CODE (size) == INTEGER_CST && size_maybe_const) |
231bd014 | 5160 | { |
5161 | constant_expression_warning (size); | |
5162 | if (tree_int_cst_sgn (size) < 0) | |
5163 | { | |
d1dd9ac0 | 5164 | if (name) |
e60a6f7b | 5165 | error_at (loc, "size of array %qE is negative", name); |
d1dd9ac0 | 5166 | else |
e60a6f7b | 5167 | error_at (loc, "size of unnamed array is negative"); |
231bd014 | 5168 | size = integer_one_node; |
5169 | } | |
a75b1c71 | 5170 | /* Handle a size folded to an integer constant but |
5171 | not an integer constant expression. */ | |
5172 | if (!size_int_const) | |
5173 | { | |
ce4e9a43 | 5174 | /* If this is a file scope declaration of an |
5175 | ordinary identifier, this is invalid code; | |
5176 | diagnosing it here and not subsequently | |
5177 | treating the type as variable-length avoids | |
5178 | more confusing diagnostics later. */ | |
5179 | if ((decl_context == NORMAL || decl_context == FIELD) | |
5180 | && current_scope == file_scope) | |
5181 | pedwarn (input_location, 0, | |
d1dd9ac0 | 5182 | "variably modified %qE at file scope", |
5183 | name); | |
ce4e9a43 | 5184 | else |
b99f3c92 | 5185 | this_size_varies = size_varies = true; |
d1dd9ac0 | 5186 | warn_variable_length_array (name, size); |
a75b1c71 | 5187 | } |
231bd014 | 5188 | } |
dc95eae2 | 5189 | else if ((decl_context == NORMAL || decl_context == FIELD) |
5190 | && current_scope == file_scope) | |
5191 | { | |
e60a6f7b | 5192 | error_at (loc, "variably modified %qE at file scope", name); |
dc95eae2 | 5193 | size = integer_one_node; |
5194 | } | |
231bd014 | 5195 | else |
5196 | { | |
5197 | /* Make sure the array size remains visibly | |
5198 | nonconstant even if it is (eg) a const variable | |
5199 | with known value. */ | |
b99f3c92 | 5200 | this_size_varies = size_varies = true; |
d1dd9ac0 | 5201 | warn_variable_length_array (name, size); |
231bd014 | 5202 | } |
51ef3909 | 5203 | |
a75b1c71 | 5204 | if (integer_zerop (size) && !this_size_varies) |
231bd014 | 5205 | { |
a0c938f0 | 5206 | /* A zero-length array cannot be represented with |
5207 | an unsigned index type, which is what we'll | |
5208 | get with build_index_type. Create an | |
5209 | open-ended range instead. */ | |
231bd014 | 5210 | itype = build_range_type (sizetype, size, NULL_TREE); |
5211 | } | |
5212 | else | |
5213 | { | |
4bf51001 | 5214 | /* Arrange for the SAVE_EXPR on the inside of the |
5215 | MINUS_EXPR, which allows the -1 to get folded | |
5216 | with the +1 that happens when building TYPE_SIZE. */ | |
5217 | if (size_varies) | |
7fc1e5fb | 5218 | size = c_variable_size (size); |
a75b1c71 | 5219 | if (this_size_varies && TREE_CODE (size) == INTEGER_CST) |
5220 | size = build2 (COMPOUND_EXPR, TREE_TYPE (size), | |
5221 | integer_zero_node, size); | |
4bf51001 | 5222 | |
231bd014 | 5223 | /* Compute the maximum valid index, that is, size |
5224 | - 1. Do the calculation in index_type, so that | |
5225 | if it is a variable the computations will be | |
5226 | done in the proper mode. */ | |
49d00087 | 5227 | itype = fold_build2 (MINUS_EXPR, index_type, |
5228 | convert (index_type, size), | |
5229 | convert (index_type, | |
5230 | size_one_node)); | |
231bd014 | 5231 | |
a0c938f0 | 5232 | /* If that overflowed, the array is too big. ??? |
231bd014 | 5233 | While a size of INT_MAX+1 technically shouldn't |
5234 | cause an overflow (because we subtract 1), the | |
5235 | overflow is recorded during the conversion to | |
5236 | index_type, before the subtraction. Handling | |
5237 | this case seems like an unnecessary | |
5238 | complication. */ | |
b468918a | 5239 | if (TREE_CODE (itype) == INTEGER_CST |
5240 | && TREE_OVERFLOW (itype)) | |
231bd014 | 5241 | { |
d1dd9ac0 | 5242 | if (name) |
e60a6f7b | 5243 | error_at (loc, "size of array %qE is too large", |
5244 | name); | |
d1dd9ac0 | 5245 | else |
e60a6f7b | 5246 | error_at (loc, "size of unnamed array is too large"); |
231bd014 | 5247 | type = error_mark_node; |
5248 | continue; | |
5249 | } | |
a0c938f0 | 5250 | |
231bd014 | 5251 | itype = build_index_type (itype); |
5252 | } | |
a75b1c71 | 5253 | if (this_size_varies) |
5254 | { | |
5255 | if (*expr) | |
5256 | *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size), | |
5257 | *expr, size); | |
5258 | else | |
5259 | *expr = size; | |
5260 | *expr_const_operands &= size_maybe_const; | |
5261 | } | |
231bd014 | 5262 | } |
5263 | else if (decl_context == FIELD) | |
5264 | { | |
0af147a4 | 5265 | bool flexible_array_member = false; |
51428eb1 | 5266 | if (array_parm_vla_unspec_p) |
5267 | /* Field names can in fact have function prototype | |
5268 | scope so [*] is disallowed here through making | |
5269 | the field variably modified, not through being | |
5270 | something other than a declaration with function | |
5271 | prototype scope. */ | |
b99f3c92 | 5272 | size_varies = true; |
0af147a4 | 5273 | else |
5274 | { | |
5275 | const struct c_declarator *t = declarator; | |
5276 | while (t->kind == cdk_attrs) | |
5277 | t = t->declarator; | |
5278 | flexible_array_member = (t->kind == cdk_id); | |
5279 | } | |
5280 | if (flexible_array_member | |
5281 | && pedantic && !flag_isoc99 && !in_system_header) | |
e60a6f7b | 5282 | pedwarn (loc, OPT_pedantic, |
21ca8540 | 5283 | "ISO C90 does not support flexible array members"); |
fca37017 | 5284 | |
231bd014 | 5285 | /* ISO C99 Flexible array members are effectively |
5286 | identical to GCC's zero-length array extension. */ | |
0af147a4 | 5287 | if (flexible_array_member || array_parm_vla_unspec_p) |
5288 | itype = build_range_type (sizetype, size_zero_node, | |
5289 | NULL_TREE); | |
231bd014 | 5290 | } |
32d33ab2 | 5291 | else if (decl_context == PARM) |
5292 | { | |
5293 | if (array_parm_vla_unspec_p) | |
5294 | { | |
32d33ab2 | 5295 | itype = build_range_type (sizetype, size_zero_node, NULL_TREE); |
b99f3c92 | 5296 | size_varies = true; |
32d33ab2 | 5297 | } |
5298 | } | |
ce675af0 | 5299 | else if (decl_context == TYPENAME) |
5300 | { | |
5301 | if (array_parm_vla_unspec_p) | |
5302 | { | |
51428eb1 | 5303 | /* C99 6.7.5.2p4 */ |
5304 | warning (0, "%<[*]%> not in a declaration"); | |
5305 | /* We use this to avoid messing up with incomplete | |
5306 | array types of the same type, that would | |
5307 | otherwise be modified below. */ | |
ce675af0 | 5308 | itype = build_range_type (sizetype, size_zero_node, |
5309 | NULL_TREE); | |
b99f3c92 | 5310 | size_varies = true; |
ce675af0 | 5311 | } |
5312 | } | |
51ef3909 | 5313 | |
b765c734 | 5314 | /* Complain about arrays of incomplete types. */ |
5315 | if (!COMPLETE_TYPE_P (type)) | |
5316 | { | |
e60a6f7b | 5317 | error_at (loc, "array type has incomplete element type"); |
a0c938f0 | 5318 | type = error_mark_node; |
b765c734 | 5319 | } |
5320 | else | |
ce675af0 | 5321 | /* When itype is NULL, a shared incomplete array type is |
5322 | returned for all array of a given type. Elsewhere we | |
5323 | make sure we don't complete that type before copying | |
5324 | it, but here we want to make sure we don't ever | |
5325 | modify the shared type, so we gcc_assert (itype) | |
5326 | below. */ | |
b765c734 | 5327 | type = build_array_type (type, itype); |
51ef3909 | 5328 | |
4dc955c8 | 5329 | if (type != error_mark_node) |
231bd014 | 5330 | { |
4dc955c8 | 5331 | if (size_varies) |
dc95eae2 | 5332 | { |
ce675af0 | 5333 | /* It is ok to modify type here even if itype is |
5334 | NULL: if size_varies, we're in a | |
a8b99ef6 | 5335 | multi-dimensional array and the inner type has |
ce675af0 | 5336 | variable size, so the enclosing shared array type |
5337 | must too. */ | |
dc95eae2 | 5338 | if (size && TREE_CODE (size) == INTEGER_CST) |
5339 | type | |
5340 | = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); | |
5341 | C_TYPE_VARIABLE_SIZE (type) = 1; | |
5342 | } | |
4dc955c8 | 5343 | |
5344 | /* The GCC extension for zero-length arrays differs from | |
5345 | ISO flexible array members in that sizeof yields | |
5346 | zero. */ | |
5347 | if (size && integer_zerop (size)) | |
5348 | { | |
ce675af0 | 5349 | gcc_assert (itype); |
4dc955c8 | 5350 | TYPE_SIZE (type) = bitsize_zero_node; |
5351 | TYPE_SIZE_UNIT (type) = size_zero_node; | |
5352 | } | |
32d33ab2 | 5353 | if (array_parm_vla_unspec_p) |
5354 | { | |
ce675af0 | 5355 | gcc_assert (itype); |
32d33ab2 | 5356 | /* The type is complete. C99 6.7.5.2p4 */ |
5357 | TYPE_SIZE (type) = bitsize_zero_node; | |
5358 | TYPE_SIZE_UNIT (type) = size_zero_node; | |
5359 | } | |
231bd014 | 5360 | } |
51ef3909 | 5361 | |
231bd014 | 5362 | if (decl_context != PARM |
bb476216 | 5363 | && (array_ptr_quals != TYPE_UNQUALIFIED |
5364 | || array_ptr_attrs != NULL_TREE | |
5365 | || array_parm_static)) | |
231bd014 | 5366 | { |
e60a6f7b | 5367 | error_at (loc, "static or type qualifiers in non-parameter array declarator"); |
bb476216 | 5368 | array_ptr_quals = TYPE_UNQUALIFIED; |
5369 | array_ptr_attrs = NULL_TREE; | |
231bd014 | 5370 | array_parm_static = 0; |
5371 | } | |
5372 | break; | |
5373 | } | |
ac206aff | 5374 | case cdk_function: |
231bd014 | 5375 | { |
5376 | /* Say it's a definition only for the declarator closest | |
5377 | to the identifier, apart possibly from some | |
5378 | attributes. */ | |
5379 | bool really_funcdef = false; | |
5380 | tree arg_types; | |
5381 | if (funcdef_flag) | |
5382 | { | |
ac206aff | 5383 | const struct c_declarator *t = declarator->declarator; |
5384 | while (t->kind == cdk_attrs) | |
5385 | t = t->declarator; | |
5386 | really_funcdef = (t->kind == cdk_id); | |
231bd014 | 5387 | } |
51ef3909 | 5388 | |
231bd014 | 5389 | /* Declaring a function type. Make sure we have a valid |
5390 | type for the function to return. */ | |
5391 | if (type == error_mark_node) | |
5392 | continue; | |
a0c938f0 | 5393 | |
b99f3c92 | 5394 | size_varies = false; |
51ef3909 | 5395 | |
231bd014 | 5396 | /* Warn about some types functions can't return. */ |
5397 | if (TREE_CODE (type) == FUNCTION_TYPE) | |
5398 | { | |
d1dd9ac0 | 5399 | if (name) |
e60a6f7b | 5400 | error_at (loc, "%qE declared as function returning a " |
5401 | "function", name); | |
d1dd9ac0 | 5402 | else |
e60a6f7b | 5403 | error_at (loc, "type name declared as function " |
5404 | "returning a function"); | |
231bd014 | 5405 | type = integer_type_node; |
5406 | } | |
5407 | if (TREE_CODE (type) == ARRAY_TYPE) | |
5408 | { | |
d1dd9ac0 | 5409 | if (name) |
e60a6f7b | 5410 | error_at (loc, "%qE declared as function returning an array", |
5411 | name); | |
d1dd9ac0 | 5412 | else |
e60a6f7b | 5413 | error_at (loc, "type name declared as function returning " |
5414 | "an array"); | |
231bd014 | 5415 | type = integer_type_node; |
5416 | } | |
2b3c93a3 | 5417 | errmsg = targetm.invalid_return_type (type); |
5418 | if (errmsg) | |
5419 | { | |
5420 | error (errmsg); | |
5421 | type = integer_type_node; | |
5422 | } | |
51ef3909 | 5423 | |
231bd014 | 5424 | /* Construct the function type and go to the next |
5425 | inner layer of declarator. */ | |
ac206aff | 5426 | arg_info = declarator->u.arg_info; |
231bd014 | 5427 | arg_types = grokparms (arg_info, really_funcdef); |
2e3bc123 | 5428 | if (really_funcdef) |
5429 | put_pending_sizes (arg_info->pending_sizes); | |
51ef3909 | 5430 | |
231bd014 | 5431 | /* Type qualifiers before the return type of the function |
5432 | qualify the return type, not the function type. */ | |
5433 | if (type_quals) | |
5434 | { | |
a0c938f0 | 5435 | /* Type qualifiers on a function return type are |
231bd014 | 5436 | normally permitted by the standard but have no |
5437 | effect, so give a warning at -Wreturn-type. | |
5438 | Qualifiers on a void return type are banned on | |
5439 | function definitions in ISO C; GCC used to used | |
5440 | them for noreturn functions. */ | |
5441 | if (VOID_TYPE_P (type) && really_funcdef) | |
e60a6f7b | 5442 | pedwarn (loc, 0, |
21ca8540 | 5443 | "function definition has qualified void return type"); |
8b6866af | 5444 | else |
e60a6f7b | 5445 | warning_at (loc, OPT_Wignored_qualifiers, |
8b6866af | 5446 | "type qualifiers ignored on function return type"); |
a0c938f0 | 5447 | |
231bd014 | 5448 | type = c_build_qualified_type (type, type_quals); |
5449 | } | |
5450 | type_quals = TYPE_UNQUALIFIED; | |
a0c938f0 | 5451 | |
231bd014 | 5452 | type = build_function_type (type, arg_types); |
ac206aff | 5453 | declarator = declarator->declarator; |
a0c938f0 | 5454 | |
231bd014 | 5455 | /* Set the TYPE_CONTEXTs for each tagged type which is local to |
5456 | the formal parameter list of this FUNCTION_TYPE to point to | |
5457 | the FUNCTION_TYPE node itself. */ | |
613f2a35 | 5458 | { |
231bd014 | 5459 | tree link; |
a0c938f0 | 5460 | |
ac206aff | 5461 | for (link = arg_info->tags; |
231bd014 | 5462 | link; |
5463 | link = TREE_CHAIN (link)) | |
5464 | TYPE_CONTEXT (TREE_VALUE (link)) = type; | |
613f2a35 | 5465 | } |
231bd014 | 5466 | break; |
5467 | } | |
ac206aff | 5468 | case cdk_pointer: |
51ef3909 | 5469 | { |
231bd014 | 5470 | /* Merge any constancy or volatility into the target type |
5471 | for the pointer. */ | |
51ef3909 | 5472 | |
231bd014 | 5473 | if (pedantic && TREE_CODE (type) == FUNCTION_TYPE |
5474 | && type_quals) | |
e60a6f7b | 5475 | pedwarn (loc, OPT_pedantic, |
21ca8540 | 5476 | "ISO C forbids qualified function types"); |
231bd014 | 5477 | if (type_quals) |
5478 | type = c_build_qualified_type (type, type_quals); | |
b99f3c92 | 5479 | size_varies = false; |
bb476216 | 5480 | |
6e8435a1 | 5481 | /* When the pointed-to type involves components of variable size, |
5482 | care must be taken to ensure that the size evaluation code is | |
5483 | emitted early enough to dominate all the possible later uses | |
5484 | and late enough for the variables on which it depends to have | |
5485 | been assigned. | |
5486 | ||
5487 | This is expected to happen automatically when the pointed-to | |
5488 | type has a name/declaration of it's own, but special attention | |
5489 | is required if the type is anonymous. | |
5490 | ||
5491 | We handle the NORMAL and FIELD contexts here by attaching an | |
5492 | artificial TYPE_DECL to such pointed-to type. This forces the | |
5493 | sizes evaluation at a safe point and ensures it is not deferred | |
5494 | until e.g. within a deeper conditional context. | |
5495 | ||
5496 | We expect nothing to be needed here for PARM or TYPENAME. | |
5497 | Pushing a TYPE_DECL at this point for TYPENAME would actually | |
5498 | be incorrect, as we might be in the middle of an expression | |
5499 | with side effects on the pointed-to type size "arguments" prior | |
5500 | to the pointer declaration point and the fake TYPE_DECL in the | |
5501 | enclosing context would force the size evaluation prior to the | |
5502 | side effects. */ | |
5503 | ||
5504 | if (!TYPE_NAME (type) | |
5505 | && (decl_context == NORMAL || decl_context == FIELD) | |
5506 | && variably_modified_type_p (type, NULL_TREE)) | |
5507 | { | |
e60a6f7b | 5508 | tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type); |
6e8435a1 | 5509 | DECL_ARTIFICIAL (decl) = 1; |
5510 | pushdecl (decl); | |
e60a6f7b | 5511 | finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE); |
6e8435a1 | 5512 | TYPE_NAME (type) = decl; |
5513 | } | |
5514 | ||
231bd014 | 5515 | type = build_pointer_type (type); |
a0c938f0 | 5516 | |
9553111d | 5517 | /* Process type qualifiers (such as const or volatile) |
5518 | that were given inside the `*'. */ | |
bb476216 | 5519 | type_quals = declarator->u.pointer_quals; |
9553111d | 5520 | |
ac206aff | 5521 | declarator = declarator->declarator; |
231bd014 | 5522 | break; |
51ef3909 | 5523 | } |
231bd014 | 5524 | default: |
5525 | gcc_unreachable (); | |
51ef3909 | 5526 | } |
51ef3909 | 5527 | } |
e47ffaae | 5528 | *decl_attrs = chainon (returned_attrs, *decl_attrs); |
51ef3909 | 5529 | |
aebc8537 | 5530 | /* Now TYPE has the actual type, apart from any qualifiers in |
5531 | TYPE_QUALS. */ | |
51ef3909 | 5532 | |
8b54bce6 | 5533 | /* Check the type and width of a bit-field. */ |
5534 | if (bitfield) | |
d1dd9ac0 | 5535 | check_bitfield_type_and_width (&type, width, name); |
8b54bce6 | 5536 | |
0dbd1c74 | 5537 | /* Did array size calculations overflow? */ |
5538 | ||
5539 | if (TREE_CODE (type) == ARRAY_TYPE | |
4b72716d | 5540 | && COMPLETE_TYPE_P (type) |
c96dc3af | 5541 | && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST |
31d32a04 | 5542 | && TREE_OVERFLOW (TYPE_SIZE_UNIT (type))) |
a37bbfd1 | 5543 | { |
d1dd9ac0 | 5544 | if (name) |
e60a6f7b | 5545 | error_at (loc, "size of array %qE is too large", name); |
d1dd9ac0 | 5546 | else |
e60a6f7b | 5547 | error_at (loc, "size of unnamed array is too large"); |
734c98be | 5548 | /* If we proceed with the array type as it is, we'll eventually |
a37bbfd1 | 5549 | crash in tree_low_cst(). */ |
5550 | type = error_mark_node; | |
5551 | } | |
0dbd1c74 | 5552 | |
51ef3909 | 5553 | /* If this is declaring a typedef name, return a TYPE_DECL. */ |
5554 | ||
feb04535 | 5555 | if (storage_class == csc_typedef) |
51ef3909 | 5556 | { |
5557 | tree decl; | |
51ef3909 | 5558 | if (pedantic && TREE_CODE (type) == FUNCTION_TYPE |
a5b1863e | 5559 | && type_quals) |
e60a6f7b | 5560 | pedwarn (loc, OPT_pedantic, |
21ca8540 | 5561 | "ISO C forbids qualified function types"); |
a5b1863e | 5562 | if (type_quals) |
5563 | type = c_build_qualified_type (type, type_quals); | |
e60a6f7b | 5564 | decl = build_decl (declarator->id_loc, |
5565 | TYPE_DECL, declarator->u.id, type); | |
70dd11f7 | 5566 | if (declspecs->explicit_signed_p) |
51ef3909 | 5567 | C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1; |
ebdbd341 | 5568 | if (declspecs->inline_p) |
e60a6f7b | 5569 | pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl); |
26dbec0a | 5570 | |
5571 | if (warn_cxx_compat && declarator->u.id != NULL_TREE) | |
5572 | { | |
5573 | struct c_binding *b = I_TAG_BINDING (declarator->u.id); | |
5574 | ||
5575 | if (b != NULL | |
5576 | && b->decl != NULL_TREE | |
5577 | && (B_IN_CURRENT_SCOPE (b) | |
5578 | || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b))) | |
5579 | && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type)) | |
5580 | { | |
5581 | warning_at (declarator->id_loc, OPT_Wc___compat, | |
5582 | ("using %qD as both a typedef and a tag is " | |
5583 | "invalid in C++"), | |
5584 | decl); | |
5585 | if (b->locus != UNKNOWN_LOCATION) | |
5586 | inform (b->locus, "originally defined here"); | |
5587 | } | |
5588 | } | |
5589 | ||
51ef3909 | 5590 | return decl; |
5591 | } | |
5592 | ||
51ef3909 | 5593 | /* If this is a type name (such as, in a cast or sizeof), |
5594 | compute the type and return it now. */ | |
5595 | ||
5596 | if (decl_context == TYPENAME) | |
5597 | { | |
ebdbd341 | 5598 | /* Note that the grammar rejects storage classes in typenames |
5599 | and fields. */ | |
5600 | gcc_assert (storage_class == csc_none && !threadp | |
5601 | && !declspecs->inline_p); | |
51ef3909 | 5602 | if (pedantic && TREE_CODE (type) == FUNCTION_TYPE |
a5b1863e | 5603 | && type_quals) |
e60a6f7b | 5604 | pedwarn (loc, OPT_pedantic, |
21ca8540 | 5605 | "ISO C forbids const or volatile function types"); |
a5b1863e | 5606 | if (type_quals) |
5607 | type = c_build_qualified_type (type, type_quals); | |
51ef3909 | 5608 | return type; |
5609 | } | |
5610 | ||
32d33ab2 | 5611 | if (pedantic && decl_context == FIELD |
5612 | && variably_modified_type_p (type, NULL_TREE)) | |
5613 | { | |
5614 | /* C99 6.7.2.1p8 */ | |
e60a6f7b | 5615 | pedwarn (loc, OPT_pedantic, "a member of a structure or union cannot " |
5616 | "have a variably modified type"); | |
32d33ab2 | 5617 | } |
5618 | ||
896f20c3 | 5619 | /* Aside from typedefs and type names (handle above), |
5620 | `void' at top level (not within pointer) | |
5621 | is allowed only in public variables. | |
51ef3909 | 5622 | We don't complain about parms either, but that is because |
5623 | a better error message can be made later. */ | |
5624 | ||
5c803577 | 5625 | if (VOID_TYPE_P (type) && decl_context != PARM |
84166705 | 5626 | && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE) |
feb04535 | 5627 | && (storage_class == csc_extern |
393b349a | 5628 | || (current_scope == file_scope |
feb04535 | 5629 | && !(storage_class == csc_static |
5630 | || storage_class == csc_register))))) | |
51ef3909 | 5631 | { |
e60a6f7b | 5632 | error_at (loc, "variable or field %qE declared void", name); |
51ef3909 | 5633 | type = integer_type_node; |
5634 | } | |
5635 | ||
5636 | /* Now create the decl, which may be a VAR_DECL, a PARM_DECL | |
5637 | or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */ | |
5638 | ||
5639 | { | |
e3c541f0 | 5640 | tree decl; |
51ef3909 | 5641 | |
5642 | if (decl_context == PARM) | |
5643 | { | |
e94026da | 5644 | tree promoted_type; |
51ef3909 | 5645 | |
5646 | /* A parameter declared as an array of T is really a pointer to T. | |
5647 | One declared as a function is really a pointer to a function. */ | |
5648 | ||
5649 | if (TREE_CODE (type) == ARRAY_TYPE) | |
5650 | { | |
5651 | /* Transfer const-ness of array into that of type pointed to. */ | |
c7b1c5d8 | 5652 | type = TREE_TYPE (type); |
a5b1863e | 5653 | if (type_quals) |
5654 | type = c_build_qualified_type (type, type_quals); | |
c7b1c5d8 | 5655 | type = build_pointer_type (type); |
bb476216 | 5656 | type_quals = array_ptr_quals; |
eb52d13a | 5657 | if (type_quals) |
5658 | type = c_build_qualified_type (type, type_quals); | |
1fd94215 | 5659 | |
bb476216 | 5660 | /* We don't yet implement attributes in this context. */ |
5661 | if (array_ptr_attrs != NULL_TREE) | |
e60a6f7b | 5662 | warning_at (loc, OPT_Wattributes, |
5663 | "attributes in parameter array declarator ignored"); | |
1fd94215 | 5664 | |
b99f3c92 | 5665 | size_varies = false; |
51ef3909 | 5666 | } |
5667 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
5668 | { | |
8864917d | 5669 | if (type_quals) |
e60a6f7b | 5670 | pedwarn (loc, OPT_pedantic, |
21ca8540 | 5671 | "ISO C forbids qualified function types"); |
a5b1863e | 5672 | if (type_quals) |
5673 | type = c_build_qualified_type (type, type_quals); | |
c7b1c5d8 | 5674 | type = build_pointer_type (type); |
a5b1863e | 5675 | type_quals = TYPE_UNQUALIFIED; |
51ef3909 | 5676 | } |
7c772c9a | 5677 | else if (type_quals) |
5678 | type = c_build_qualified_type (type, type_quals); | |
1cae46be | 5679 | |
e60a6f7b | 5680 | decl = build_decl (declarator->id_loc, |
5681 | PARM_DECL, declarator->u.id, type); | |
08f8d953 | 5682 | if (size_varies) |
51ef3909 | 5683 | C_DECL_VARIABLE_SIZE (decl) = 1; |
5684 | ||
5685 | /* Compute the type actually passed in the parmlist, | |
5686 | for the case where there is no prototype. | |
5687 | (For example, shorts and chars are passed as ints.) | |
5688 | When there is a prototype, this is overridden later. */ | |
5689 | ||
e94026da | 5690 | if (type == error_mark_node) |
5691 | promoted_type = type; | |
5692 | else | |
63c62881 | 5693 | promoted_type = c_type_promotes_to (type); |
51ef3909 | 5694 | |
e94026da | 5695 | DECL_ARG_TYPE (decl) = promoted_type; |
ebdbd341 | 5696 | if (declspecs->inline_p) |
e60a6f7b | 5697 | pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl); |
51ef3909 | 5698 | } |
5699 | else if (decl_context == FIELD) | |
5700 | { | |
ebdbd341 | 5701 | /* Note that the grammar rejects storage classes in typenames |
5702 | and fields. */ | |
5703 | gcc_assert (storage_class == csc_none && !threadp | |
5704 | && !declspecs->inline_p); | |
5705 | ||
51ef3909 | 5706 | /* Structure field. It may not be a function. */ |
b9d8dcc9 | 5707 | |
51ef3909 | 5708 | if (TREE_CODE (type) == FUNCTION_TYPE) |
5709 | { | |
e60a6f7b | 5710 | error_at (loc, "field %qE declared as a function", name); |
51ef3909 | 5711 | type = build_pointer_type (type); |
5712 | } | |
4b72716d | 5713 | else if (TREE_CODE (type) != ERROR_MARK |
a0c938f0 | 5714 | && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type)) |
51ef3909 | 5715 | { |
7f824b22 | 5716 | if (name) |
e60a6f7b | 5717 | error_at (loc, "field %qE has incomplete type", name); |
7f824b22 | 5718 | else |
e60a6f7b | 5719 | error_at (loc, "unnamed field has incomplete type"); |
51ef3909 | 5720 | type = error_mark_node; |
5721 | } | |
aebc8537 | 5722 | type = c_build_qualified_type (type, type_quals); |
e60a6f7b | 5723 | decl = build_decl (declarator->id_loc, |
5724 | FIELD_DECL, declarator->u.id, type); | |
851dfbff | 5725 | DECL_NONADDRESSABLE_P (decl) = bitfield; |
78ba9fed | 5726 | if (bitfield && !declarator->u.id) |
5727 | TREE_NO_WARNING (decl) = 1; | |
851dfbff | 5728 | |
08f8d953 | 5729 | if (size_varies) |
51ef3909 | 5730 | C_DECL_VARIABLE_SIZE (decl) = 1; |
5731 | } | |
5732 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
5733 | { | |
feb04535 | 5734 | if (storage_class == csc_register || threadp) |
91d51df3 | 5735 | { |
e60a6f7b | 5736 | error_at (loc, "invalid storage class for function %qE", name); |
91d51df3 | 5737 | } |
72394149 | 5738 | else if (current_scope != file_scope) |
5739 | { | |
5740 | /* Function declaration not at file scope. Storage | |
5741 | classes other than `extern' are not allowed, C99 | |
5742 | 6.7.1p5, and `extern' makes no difference. However, | |
5743 | GCC allows 'auto', perhaps with 'inline', to support | |
5744 | nested functions. */ | |
feb04535 | 5745 | if (storage_class == csc_auto) |
e60a6f7b | 5746 | pedwarn (loc, OPT_pedantic, |
d1dd9ac0 | 5747 | "invalid storage class for function %qE", name); |
61ba37bf | 5748 | else if (storage_class == csc_static) |
91d51df3 | 5749 | { |
e60a6f7b | 5750 | error_at (loc, "invalid storage class for function %qE", name); |
a0c938f0 | 5751 | if (funcdef_flag) |
61ba37bf | 5752 | storage_class = declspecs->storage_class = csc_none; |
5753 | else | |
5754 | return 0; | |
91d51df3 | 5755 | } |
72394149 | 5756 | } |
b3319231 | 5757 | |
e60a6f7b | 5758 | decl = build_decl (declarator->id_loc, |
5759 | FUNCTION_DECL, declarator->u.id, type); | |
61ba37bf | 5760 | decl = build_decl_attribute_variant (decl, decl_attr); |
5761 | ||
84166705 | 5762 | if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl)) |
e60a6f7b | 5763 | pedwarn (loc, OPT_pedantic, |
8864917d | 5764 | "ISO C forbids qualified function types"); |
51ef3909 | 5765 | |
0bfe2579 | 5766 | /* GNU C interprets a volatile-qualified function type to indicate |
a5b1863e | 5767 | that the function does not return. */ |
5768 | if ((type_quals & TYPE_QUAL_VOLATILE) | |
5c803577 | 5769 | && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl)))) |
e60a6f7b | 5770 | warning_at (loc, 0, "%<noreturn%> function returns non-void value"); |
896f20c3 | 5771 | |
b3e83e1e | 5772 | /* Every function declaration is an external reference |
5773 | (DECL_EXTERNAL) except for those which are not at file | |
5774 | scope and are explicitly declared "auto". This is | |
5775 | forbidden by standard C (C99 6.7.1p5) and is interpreted by | |
5776 | GCC to signify a forward declaration of a nested function. */ | |
feb04535 | 5777 | if (storage_class == csc_auto && current_scope != file_scope) |
b3e83e1e | 5778 | DECL_EXTERNAL (decl) = 0; |
c42cc79e | 5779 | /* In C99, a function which is declared 'inline' with 'extern' |
5780 | is not an external reference (which is confusing). It | |
5781 | means that the later definition of the function must be output | |
5782 | in this file, C99 6.7.4p6. In GNU C89, a function declared | |
5783 | 'extern inline' is an external reference. */ | |
5784 | else if (declspecs->inline_p && storage_class != csc_static) | |
11950bdd | 5785 | DECL_EXTERNAL (decl) = ((storage_class == csc_extern) |
5786 | == flag_gnu89_inline); | |
b3e83e1e | 5787 | else |
c42cc79e | 5788 | DECL_EXTERNAL (decl) = !initialized; |
491e04ef | 5789 | |
51ef3909 | 5790 | /* Record absence of global scope for `static' or `auto'. */ |
5791 | TREE_PUBLIC (decl) | |
feb04535 | 5792 | = !(storage_class == csc_static || storage_class == csc_auto); |
dcde0ff5 | 5793 | |
a89ce285 | 5794 | /* For a function definition, record the argument information |
731e6cbf | 5795 | block where store_parm_decls will look for it. */ |
a89ce285 | 5796 | if (funcdef_flag) |
731e6cbf | 5797 | current_function_arg_info = arg_info; |
a89ce285 | 5798 | |
70dd11f7 | 5799 | if (declspecs->default_int_p) |
af857942 | 5800 | C_FUNCTION_IMPLICIT_INT (decl) = 1; |
5801 | ||
51ef3909 | 5802 | /* Record presence of `inline', if it is reasonable. */ |
ebdbd341 | 5803 | if (flag_hosted && MAIN_NAME_P (declarator->u.id)) |
51ef3909 | 5804 | { |
feb04535 | 5805 | if (declspecs->inline_p) |
e60a6f7b | 5806 | pedwarn (loc, 0, "cannot inline function %<main%>"); |
3b288406 | 5807 | } |
feb04535 | 5808 | else if (declspecs->inline_p) |
81549c4d | 5809 | /* Record that the function is declared `inline'. */ |
5810 | DECL_DECLARED_INLINE_P (decl) = 1; | |
51ef3909 | 5811 | } |
5812 | else | |
5813 | { | |
5814 | /* It's a variable. */ | |
b3319231 | 5815 | /* An uninitialized decl with `extern' is a reference. */ |
feb04535 | 5816 | int extern_ref = !initialized && storage_class == csc_extern; |
51ef3909 | 5817 | |
aebc8537 | 5818 | type = c_build_qualified_type (type, type_quals); |
c2621053 | 5819 | |
393b349a | 5820 | /* C99 6.2.2p7: It is invalid (compile-time undefined |
5821 | behavior) to create an 'extern' declaration for a | |
c2621053 | 5822 | variable if there is a global declaration that is |
393b349a | 5823 | 'static' and the global declaration is not visible. |
5824 | (If the static declaration _is_ currently visible, | |
5825 | the 'extern' declaration is taken to refer to that decl.) */ | |
5826 | if (extern_ref && current_scope != file_scope) | |
c2621053 | 5827 | { |
ac206aff | 5828 | tree global_decl = identifier_global_value (declarator->u.id); |
5829 | tree visible_decl = lookup_name (declarator->u.id); | |
c2621053 | 5830 | |
1cae46be | 5831 | if (global_decl |
393b349a | 5832 | && global_decl != visible_decl |
c2621053 | 5833 | && TREE_CODE (global_decl) == VAR_DECL |
5834 | && !TREE_PUBLIC (global_decl)) | |
e60a6f7b | 5835 | error_at (loc, "variable previously declared %<static%> " |
5836 | "redeclared %<extern%>"); | |
c2621053 | 5837 | } |
5838 | ||
e60a6f7b | 5839 | decl = build_decl (declarator->id_loc, |
5840 | VAR_DECL, declarator->u.id, type); | |
08f8d953 | 5841 | if (size_varies) |
51ef3909 | 5842 | C_DECL_VARIABLE_SIZE (decl) = 1; |
5843 | ||
feb04535 | 5844 | if (declspecs->inline_p) |
e60a6f7b | 5845 | pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl); |
51ef3909 | 5846 | |
8dfad60e | 5847 | /* At file scope, an initialized extern declaration may follow |
5848 | a static declaration. In that case, DECL_EXTERNAL will be | |
5849 | reset later in start_decl. */ | |
feb04535 | 5850 | DECL_EXTERNAL (decl) = (storage_class == csc_extern); |
2a6f0f81 | 5851 | |
6e899616 | 5852 | /* At file scope, the presence of a `static' or `register' storage |
76665aeb | 5853 | class specifier, or the absence of all storage class specifiers |
5854 | makes this declaration a definition (perhaps tentative). Also, | |
23bf35fe | 5855 | the absence of `static' makes it public. */ |
393b349a | 5856 | if (current_scope == file_scope) |
51ef3909 | 5857 | { |
23bf35fe | 5858 | TREE_PUBLIC (decl) = storage_class != csc_static; |
2a6f0f81 | 5859 | TREE_STATIC (decl) = !extern_ref; |
51ef3909 | 5860 | } |
6e899616 | 5861 | /* Not at file scope, only `static' makes a static definition. */ |
51ef3909 | 5862 | else |
5863 | { | |
feb04535 | 5864 | TREE_STATIC (decl) = (storage_class == csc_static); |
2a6f0f81 | 5865 | TREE_PUBLIC (decl) = extern_ref; |
5866 | } | |
5867 | ||
feb04535 | 5868 | if (threadp) |
9dda1f80 | 5869 | DECL_TLS_MODEL (decl) = decl_default_tls_model (decl); |
51ef3909 | 5870 | } |
5871 | ||
1d9b9611 | 5872 | if ((storage_class == csc_extern |
5873 | || (storage_class == csc_none | |
5874 | && TREE_CODE (type) == FUNCTION_TYPE | |
5875 | && !funcdef_flag)) | |
32d33ab2 | 5876 | && variably_modified_type_p (type, NULL_TREE)) |
5877 | { | |
5878 | /* C99 6.7.5.2p2 */ | |
1d9b9611 | 5879 | if (TREE_CODE (type) == FUNCTION_TYPE) |
e60a6f7b | 5880 | error_at (loc, "non-nested function with variably modified type"); |
1d9b9611 | 5881 | else |
e60a6f7b | 5882 | error_at (loc, "object with variably modified type must have " |
5883 | "no linkage"); | |
32d33ab2 | 5884 | } |
5885 | ||
51ef3909 | 5886 | /* Record `register' declaration for warnings on & |
5887 | and in case doing stupid register allocation. */ | |
5888 | ||
feb04535 | 5889 | if (storage_class == csc_register) |
7746224a | 5890 | { |
5891 | C_DECL_REGISTER (decl) = 1; | |
5892 | DECL_REGISTER (decl) = 1; | |
5893 | } | |
51ef3909 | 5894 | |
5895 | /* Record constancy and volatility. */ | |
a5b1863e | 5896 | c_apply_type_quals_to_decl (type_quals, decl); |
51ef3909 | 5897 | |
51ef3909 | 5898 | /* If a type has volatile components, it should be stored in memory. |
5899 | Otherwise, the fact that those components are volatile | |
5ded8c6f | 5900 | will be ignored, and would even crash the compiler. |
5901 | Of course, this only makes sense on VAR,PARM, and RESULT decl's. */ | |
5902 | if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)) | |
5903 | && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL | |
5904 | || TREE_CODE (decl) == RESULT_DECL)) | |
7746224a | 5905 | { |
5906 | /* It is not an error for a structure with volatile fields to | |
5907 | be declared register, but reset DECL_REGISTER since it | |
5908 | cannot actually go in a register. */ | |
5909 | int was_reg = C_DECL_REGISTER (decl); | |
5910 | C_DECL_REGISTER (decl) = 0; | |
5911 | DECL_REGISTER (decl) = 0; | |
5912 | c_mark_addressable (decl); | |
5913 | C_DECL_REGISTER (decl) = was_reg; | |
5914 | } | |
51ef3909 | 5915 | |
418089c3 | 5916 | /* This is the earliest point at which we might know the assembler |
5917 | name of a variable. Thus, if it's known before this, die horribly. */ | |
231bd014 | 5918 | gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl)); |
418089c3 | 5919 | |
4a76ab2a | 5920 | if (warn_cxx_compat |
5921 | && TREE_CODE (decl) == VAR_DECL | |
5922 | && TREE_PUBLIC (decl) | |
5923 | && TREE_STATIC (decl) | |
5924 | && (TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE | |
5925 | || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE | |
5926 | || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE) | |
5927 | && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE) | |
5928 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat, | |
5929 | ("non-local variable %qD with anonymous type is " | |
5930 | "questionable in C++"), | |
5931 | decl); | |
5932 | ||
51ef3909 | 5933 | return decl; |
5934 | } | |
5935 | } | |
5936 | \f | |
51ef3909 | 5937 | /* Decode the parameter-list info for a function type or function definition. |
32d33ab2 | 5938 | The argument is the value returned by `get_parm_info' (or made in c-parse.c |
51ef3909 | 5939 | if there is an identifier list instead of a parameter decl list). |
5940 | These two functions are separate because when a function returns | |
5941 | or receives functions then each is called multiple times but the order | |
5942 | of calls is different. The last call to `grokparms' is always the one | |
5943 | that contains the formal parameter names of a function definition. | |
5944 | ||
51ef3909 | 5945 | Return a list of arg types to use in the FUNCTION_TYPE for this function. |
5946 | ||
4a125bfc | 5947 | FUNCDEF_FLAG is true for a function definition, false for |
51ef3909 | 5948 | a mere declaration. A nonempty identifier-list gets an error message |
4a125bfc | 5949 | when FUNCDEF_FLAG is false. */ |
51ef3909 | 5950 | |
5951 | static tree | |
ac206aff | 5952 | grokparms (struct c_arg_info *arg_info, bool funcdef_flag) |
51ef3909 | 5953 | { |
ac206aff | 5954 | tree arg_types = arg_info->types; |
51ef3909 | 5955 | |
32d33ab2 | 5956 | if (funcdef_flag && arg_info->had_vla_unspec) |
5957 | { | |
5958 | /* A function definition isn't function prototype scope C99 6.2.1p4. */ | |
5959 | /* C99 6.7.5.2p4 */ | |
5960 | error ("%<[*]%> not allowed in other than function prototype scope"); | |
5961 | } | |
5962 | ||
6bf97f82 | 5963 | if (arg_types == 0 && !funcdef_flag && !in_system_header) |
5964 | warning (OPT_Wstrict_prototypes, | |
5965 | "function declaration isn%'t a prototype"); | |
51ef3909 | 5966 | |
393b349a | 5967 | if (arg_types == error_mark_node) |
5968 | return 0; /* don't set TYPE_ARG_TYPES in this case */ | |
5969 | ||
5970 | else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE) | |
51ef3909 | 5971 | { |
84166705 | 5972 | if (!funcdef_flag) |
21ca8540 | 5973 | pedwarn (input_location, 0, "parameter names (without types) in function declaration"); |
51ef3909 | 5974 | |
ac206aff | 5975 | arg_info->parms = arg_info->types; |
5976 | arg_info->types = 0; | |
51ef3909 | 5977 | return 0; |
5978 | } | |
5979 | else | |
5980 | { | |
a89ce285 | 5981 | tree parm, type, typelt; |
5982 | unsigned int parmno; | |
2b3c93a3 | 5983 | const char *errmsg; |
a89ce285 | 5984 | |
a207ca5e | 5985 | /* If there is a parameter of incomplete type in a definition, |
5986 | this is an error. In a declaration this is valid, and a | |
5987 | struct or union type may be completed later, before any calls | |
5988 | or definition of the function. In the case where the tag was | |
5989 | first declared within the parameter list, a warning has | |
5990 | already been given. If a parameter has void type, then | |
5991 | however the function cannot be defined or called, so | |
5992 | warn. */ | |
a89ce285 | 5993 | |
ac206aff | 5994 | for (parm = arg_info->parms, typelt = arg_types, parmno = 1; |
2b652cf3 | 5995 | parm; |
a89ce285 | 5996 | parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++) |
5997 | { | |
5998 | type = TREE_VALUE (typelt); | |
5999 | if (type == error_mark_node) | |
6000 | continue; | |
6001 | ||
6002 | if (!COMPLETE_TYPE_P (type)) | |
6003 | { | |
6004 | if (funcdef_flag) | |
6005 | { | |
6006 | if (DECL_NAME (parm)) | |
712d2297 | 6007 | error_at (input_location, |
6008 | "parameter %u (%q+D) has incomplete type", | |
6009 | parmno, parm); | |
a89ce285 | 6010 | else |
712d2297 | 6011 | error_at (DECL_SOURCE_LOCATION (parm), |
6012 | "parameter %u has incomplete type", | |
6013 | parmno); | |
51ef3909 | 6014 | |
a89ce285 | 6015 | TREE_VALUE (typelt) = error_mark_node; |
6016 | TREE_TYPE (parm) = error_mark_node; | |
6017 | } | |
a207ca5e | 6018 | else if (VOID_TYPE_P (type)) |
a89ce285 | 6019 | { |
6020 | if (DECL_NAME (parm)) | |
712d2297 | 6021 | warning_at (input_location, 0, |
6022 | "parameter %u (%q+D) has void type", | |
6023 | parmno, parm); | |
a89ce285 | 6024 | else |
712d2297 | 6025 | warning_at (DECL_SOURCE_LOCATION (parm), 0, |
6026 | "parameter %u has void type", | |
6027 | parmno); | |
a89ce285 | 6028 | } |
6029 | } | |
40c4b476 | 6030 | |
2b3c93a3 | 6031 | errmsg = targetm.invalid_parameter_type (type); |
6032 | if (errmsg) | |
6033 | { | |
6034 | error (errmsg); | |
6035 | TREE_VALUE (typelt) = error_mark_node; | |
6036 | TREE_TYPE (parm) = error_mark_node; | |
6037 | } | |
6038 | ||
40c4b476 | 6039 | if (DECL_NAME (parm) && TREE_USED (parm)) |
6040 | warn_if_shadowing (parm); | |
a89ce285 | 6041 | } |
6042 | return arg_types; | |
51ef3909 | 6043 | } |
6044 | } | |
6045 | ||
ac206aff | 6046 | /* Take apart the current scope and return a c_arg_info structure with |
6047 | info on a parameter list just parsed. | |
a89ce285 | 6048 | |
ac206aff | 6049 | This structure is later fed to 'grokparms' and 'store_parm_decls'. |
51ef3909 | 6050 | |
393b349a | 6051 | ELLIPSIS being true means the argument list ended in '...' so don't |
6052 | append a sentinel (void_list_node) to the end of the type-list. */ | |
51ef3909 | 6053 | |
ac206aff | 6054 | struct c_arg_info * |
393b349a | 6055 | get_parm_info (bool ellipsis) |
51ef3909 | 6056 | { |
393b349a | 6057 | struct c_binding *b = current_scope->bindings; |
ac206aff | 6058 | struct c_arg_info *arg_info = XOBNEW (&parser_obstack, |
6059 | struct c_arg_info); | |
393b349a | 6060 | tree parms = 0; |
6061 | tree tags = 0; | |
6062 | tree types = 0; | |
6063 | tree others = 0; | |
6064 | ||
f74be9a1 | 6065 | static bool explained_incomplete_types = false; |
6066 | bool gave_void_only_once_err = false; | |
6067 | ||
ac206aff | 6068 | arg_info->parms = 0; |
6069 | arg_info->tags = 0; | |
6070 | arg_info->types = 0; | |
6071 | arg_info->others = 0; | |
2e3bc123 | 6072 | arg_info->pending_sizes = 0; |
32d33ab2 | 6073 | arg_info->had_vla_unspec = current_scope->had_vla_unspec; |
ac206aff | 6074 | |
393b349a | 6075 | /* The bindings in this scope must not get put into a block. |
6076 | We will take care of deleting the binding nodes. */ | |
6077 | current_scope->bindings = 0; | |
51ef3909 | 6078 | |
393b349a | 6079 | /* This function is only called if there was *something* on the |
6080 | parameter list. */ | |
231bd014 | 6081 | gcc_assert (b); |
f74be9a1 | 6082 | |
393b349a | 6083 | /* A parameter list consisting solely of 'void' indicates that the |
6084 | function takes no arguments. But if the 'void' is qualified | |
6085 | (by 'const' or 'volatile'), or has a storage class specifier | |
6086 | ('register'), then the behavior is undefined; issue an error. | |
6087 | Typedefs for 'void' are OK (see DR#157). */ | |
a0c938f0 | 6088 | if (b->prev == 0 /* one binding */ |
393b349a | 6089 | && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */ |
6090 | && !DECL_NAME (b->decl) /* anonymous */ | |
6091 | && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */ | |
6092 | { | |
6093 | if (TREE_THIS_VOLATILE (b->decl) | |
6094 | || TREE_READONLY (b->decl) | |
7746224a | 6095 | || C_DECL_REGISTER (b->decl)) |
b0b1af64 | 6096 | error ("%<void%> as only parameter may not be qualified"); |
f74be9a1 | 6097 | |
393b349a | 6098 | /* There cannot be an ellipsis. */ |
6099 | if (ellipsis) | |
b0b1af64 | 6100 | error ("%<void%> must be the only parameter"); |
51ef3909 | 6101 | |
ac206aff | 6102 | arg_info->types = void_list_node; |
393b349a | 6103 | return arg_info; |
51ef3909 | 6104 | } |
6105 | ||
393b349a | 6106 | if (!ellipsis) |
6107 | types = void_list_node; | |
51ef3909 | 6108 | |
393b349a | 6109 | /* Break up the bindings list into parms, tags, types, and others; |
6110 | apply sanity checks; purge the name-to-decl bindings. */ | |
6111 | while (b) | |
51ef3909 | 6112 | { |
393b349a | 6113 | tree decl = b->decl; |
6114 | tree type = TREE_TYPE (decl); | |
f74be9a1 | 6115 | const char *keyword; |
f74be9a1 | 6116 | |
393b349a | 6117 | switch (TREE_CODE (decl)) |
4214af46 | 6118 | { |
393b349a | 6119 | case PARM_DECL: |
6120 | if (b->id) | |
6121 | { | |
231bd014 | 6122 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); |
393b349a | 6123 | I_SYMBOL_BINDING (b->id) = b->shadowed; |
6124 | } | |
f74be9a1 | 6125 | |
393b349a | 6126 | /* Check for forward decls that never got their actual decl. */ |
6127 | if (TREE_ASM_WRITTEN (decl)) | |
3cf8b391 | 6128 | error ("parameter %q+D has just a forward declaration", decl); |
393b349a | 6129 | /* Check for (..., void, ...) and issue an error. */ |
6130 | else if (VOID_TYPE_P (type) && !DECL_NAME (decl)) | |
6131 | { | |
6132 | if (!gave_void_only_once_err) | |
6133 | { | |
b0b1af64 | 6134 | error ("%<void%> must be the only parameter"); |
393b349a | 6135 | gave_void_only_once_err = true; |
6136 | } | |
6137 | } | |
6138 | else | |
6139 | { | |
6140 | /* Valid parameter, add it to the list. */ | |
6141 | TREE_CHAIN (decl) = parms; | |
6142 | parms = decl; | |
6143 | ||
6144 | /* Since there is a prototype, args are passed in their | |
6145 | declared types. The back end may override this later. */ | |
6146 | DECL_ARG_TYPE (decl) = type; | |
6147 | types = tree_cons (0, type, types); | |
6148 | } | |
6149 | break; | |
f74be9a1 | 6150 | |
51acdf76 | 6151 | case ENUMERAL_TYPE: keyword = "enum"; goto tag; |
393b349a | 6152 | case UNION_TYPE: keyword = "union"; goto tag; |
51acdf76 | 6153 | case RECORD_TYPE: keyword = "struct"; goto tag; |
393b349a | 6154 | tag: |
6155 | /* Types may not have tag-names, in which case the type | |
6156 | appears in the bindings list with b->id NULL. */ | |
6157 | if (b->id) | |
6158 | { | |
231bd014 | 6159 | gcc_assert (I_TAG_BINDING (b->id) == b); |
393b349a | 6160 | I_TAG_BINDING (b->id) = b->shadowed; |
6161 | } | |
f74be9a1 | 6162 | |
393b349a | 6163 | /* Warn about any struct, union or enum tags defined in a |
6164 | parameter list. The scope of such types is limited to | |
6165 | the parameter list, which is rarely if ever desirable | |
6166 | (it's impossible to call such a function with type- | |
6167 | correct arguments). An anonymous union parm type is | |
6168 | meaningful as a GNU extension, so don't warn for that. */ | |
6169 | if (TREE_CODE (decl) != UNION_TYPE || b->id != 0) | |
6170 | { | |
6171 | if (b->id) | |
6172 | /* The %s will be one of 'struct', 'union', or 'enum'. */ | |
c3ceba8e | 6173 | warning (0, "%<%s %E%> declared inside parameter list", |
393b349a | 6174 | keyword, b->id); |
6175 | else | |
6176 | /* The %s will be one of 'struct', 'union', or 'enum'. */ | |
c3ceba8e | 6177 | warning (0, "anonymous %s declared inside parameter list", |
393b349a | 6178 | keyword); |
14338e9a | 6179 | |
84166705 | 6180 | if (!explained_incomplete_types) |
393b349a | 6181 | { |
c3ceba8e | 6182 | warning (0, "its scope is only this definition or declaration," |
393b349a | 6183 | " which is probably not what you want"); |
6184 | explained_incomplete_types = true; | |
6185 | } | |
6186 | } | |
f74be9a1 | 6187 | |
393b349a | 6188 | tags = tree_cons (b->id, decl, tags); |
6189 | break; | |
6190 | ||
6191 | case CONST_DECL: | |
6192 | case TYPE_DECL: | |
702c8527 | 6193 | case FUNCTION_DECL: |
393b349a | 6194 | /* CONST_DECLs appear here when we have an embedded enum, |
6195 | and TYPE_DECLs appear here when we have an embedded struct | |
6196 | or union. No warnings for this - we already warned about the | |
702c8527 | 6197 | type itself. FUNCTION_DECLs appear when there is an implicit |
6198 | function declaration in the parameter list. */ | |
6199 | ||
56533c31 | 6200 | TREE_CHAIN (decl) = others; |
6201 | others = decl; | |
6202 | /* fall through */ | |
6203 | ||
6204 | case ERROR_MARK: | |
6205 | /* error_mark_node appears here when we have an undeclared | |
6206 | variable. Just throw it away. */ | |
393b349a | 6207 | if (b->id) |
6208 | { | |
231bd014 | 6209 | gcc_assert (I_SYMBOL_BINDING (b->id) == b); |
393b349a | 6210 | I_SYMBOL_BINDING (b->id) = b->shadowed; |
6211 | } | |
393b349a | 6212 | break; |
6213 | ||
6214 | /* Other things that might be encountered. */ | |
6215 | case LABEL_DECL: | |
393b349a | 6216 | case VAR_DECL: |
393b349a | 6217 | default: |
231bd014 | 6218 | gcc_unreachable (); |
393b349a | 6219 | } |
6220 | ||
6221 | b = free_binding_and_advance (b); | |
f74be9a1 | 6222 | } |
6223 | ||
ac206aff | 6224 | arg_info->parms = parms; |
6225 | arg_info->tags = tags; | |
6226 | arg_info->types = types; | |
6227 | arg_info->others = others; | |
2e3bc123 | 6228 | arg_info->pending_sizes = get_pending_sizes (); |
393b349a | 6229 | return arg_info; |
51ef3909 | 6230 | } |
6231 | \f | |
6232 | /* Get the struct, enum or union (CODE says which) with tag NAME. | |
e60a6f7b | 6233 | Define the tag as a forward-reference with location LOC if it is |
6234 | not defined. Return a c_typespec structure for the type | |
6235 | specifier. */ | |
51ef3909 | 6236 | |
19702c1d | 6237 | struct c_typespec |
e60a6f7b | 6238 | parser_xref_tag (location_t loc, enum tree_code code, tree name) |
51ef3909 | 6239 | { |
19702c1d | 6240 | struct c_typespec ret; |
a75b1c71 | 6241 | tree ref; |
0b09525f | 6242 | location_t refloc; |
a75b1c71 | 6243 | |
6244 | ret.expr = NULL_TREE; | |
6245 | ret.expr_const_operands = true; | |
6246 | ||
51ef3909 | 6247 | /* If a cross reference is requested, look up the type |
6248 | already defined for this tag and return it. */ | |
6249 | ||
0b09525f | 6250 | ref = lookup_tag (code, name, 0, &refloc); |
ea97174b | 6251 | /* If this is the right type of tag, return what we found. |
6252 | (This reference will be shadowed by shadow_tag later if appropriate.) | |
6253 | If this is the wrong type of tag, do not return it. If it was the | |
6e899616 | 6254 | wrong type in the same scope, we will have had an error |
6255 | message already; if in a different scope and declaring | |
ea97174b | 6256 | a name, pending_xref_error will give an error message; but if in a |
6e899616 | 6257 | different scope and not declaring a name, this tag should |
ea97174b | 6258 | shadow the previous declaration of a different type of tag, and |
6259 | this would not work properly if we return the reference found. | |
6260 | (For example, with "struct foo" in an outer scope, "union foo;" | |
6261 | must shadow that tag with a new one of union type.) */ | |
19702c1d | 6262 | ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref); |
ea97174b | 6263 | if (ref && TREE_CODE (ref) == code) |
19702c1d | 6264 | { |
0b09525f | 6265 | if (C_TYPE_DEFINED_IN_STRUCT (ref) |
6266 | && loc != UNKNOWN_LOCATION | |
6267 | && warn_cxx_compat) | |
6268 | { | |
6269 | switch (code) | |
6270 | { | |
6271 | case ENUMERAL_TYPE: | |
6272 | warning_at (loc, OPT_Wc___compat, | |
6273 | ("enum type defined in struct or union " | |
6274 | "is not visible in C++")); | |
6275 | inform (refloc, "enum type defined here"); | |
6276 | break; | |
6277 | case RECORD_TYPE: | |
6278 | warning_at (loc, OPT_Wc___compat, | |
6279 | ("struct defined in struct or union " | |
6280 | "is not visible in C++")); | |
6281 | inform (refloc, "struct defined here"); | |
6282 | break; | |
6283 | case UNION_TYPE: | |
6284 | warning_at (loc, OPT_Wc___compat, | |
6285 | ("union defined in struct or union " | |
6286 | "is not visible in C++")); | |
6287 | inform (refloc, "union defined here"); | |
6288 | break; | |
6289 | default: | |
6290 | gcc_unreachable(); | |
6291 | } | |
6292 | } | |
6293 | ||
19702c1d | 6294 | ret.spec = ref; |
6295 | return ret; | |
6296 | } | |
51ef3909 | 6297 | |
51ef3909 | 6298 | /* If no such tag is yet defined, create a forward-reference node |
6299 | and record it as the "definition". | |
6300 | When a real declaration of this type is found, | |
6301 | the forward-reference will be altered into a real type. */ | |
6302 | ||
6303 | ref = make_node (code); | |
6304 | if (code == ENUMERAL_TYPE) | |
6305 | { | |
51ef3909 | 6306 | /* Give the type a default layout like unsigned int |
6307 | to avoid crashing if it does not get defined. */ | |
342ad2d6 | 6308 | SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node)); |
51ef3909 | 6309 | TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node); |
aca14577 | 6310 | TYPE_USER_ALIGN (ref) = 0; |
78a8ed03 | 6311 | TYPE_UNSIGNED (ref) = 1; |
51ef3909 | 6312 | TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node); |
6313 | TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node); | |
6314 | TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node); | |
6315 | } | |
6316 | ||
e60a6f7b | 6317 | pushtag (loc, name, ref); |
51ef3909 | 6318 | |
19702c1d | 6319 | ret.spec = ref; |
6320 | return ret; | |
6321 | } | |
6322 | ||
6323 | /* Get the struct, enum or union (CODE says which) with tag NAME. | |
6324 | Define the tag as a forward-reference if it is not defined. | |
6325 | Return a tree for the type. */ | |
6326 | ||
6327 | tree | |
6328 | xref_tag (enum tree_code code, tree name) | |
6329 | { | |
e60a6f7b | 6330 | return parser_xref_tag (input_location, code, name).spec; |
51ef3909 | 6331 | } |
6332 | \f | |
6e899616 | 6333 | /* Make sure that the tag NAME is defined *in the current scope* |
51ef3909 | 6334 | at least as a forward reference. |
e60a6f7b | 6335 | LOC is the location of the struct's definition. |
0b09525f | 6336 | CODE says which kind of tag NAME ought to be. |
6337 | ||
843bd2fa | 6338 | This stores the current value of the file static STRUCT_PARSE_INFO |
6339 | in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a | |
6340 | new c_struct_parse_info structure. The old value of | |
6341 | STRUCT_PARSE_INFO is restored in finish_struct. */ | |
51ef3909 | 6342 | |
6343 | tree | |
e60a6f7b | 6344 | start_struct (location_t loc, enum tree_code code, tree name, |
843bd2fa | 6345 | struct c_struct_parse_info **enclosing_struct_parse_info) |
51ef3909 | 6346 | { |
6e899616 | 6347 | /* If there is already a tag defined at this scope |
51ef3909 | 6348 | (as a forward reference), just return it. */ |
6349 | ||
0b09525f | 6350 | tree ref = NULL_TREE; |
6351 | location_t refloc = UNKNOWN_LOCATION; | |
51ef3909 | 6352 | |
0b09525f | 6353 | if (name != NULL_TREE) |
6354 | ref = lookup_tag (code, name, 1, &refloc); | |
51ef3909 | 6355 | if (ref && TREE_CODE (ref) == code) |
6356 | { | |
5dad28f1 | 6357 | if (TYPE_SIZE (ref)) |
a0c938f0 | 6358 | { |
1a5a5cd8 | 6359 | if (code == UNION_TYPE) |
0b09525f | 6360 | error_at (loc, "redefinition of %<union %E%>", name); |
a0c938f0 | 6361 | else |
0b09525f | 6362 | error_at (loc, "redefinition of %<struct %E%>", name); |
6363 | if (refloc != UNKNOWN_LOCATION) | |
6364 | inform (refloc, "originally defined here"); | |
fc92befb | 6365 | /* Don't create structures using a name already in use. */ |
6366 | ref = NULL_TREE; | |
1cae46be | 6367 | } |
5dad28f1 | 6368 | else if (C_TYPE_BEING_DEFINED (ref)) |
6369 | { | |
6370 | if (code == UNION_TYPE) | |
0b09525f | 6371 | error_at (loc, "nested redefinition of %<union %E%>", name); |
a0c938f0 | 6372 | else |
0b09525f | 6373 | error_at (loc, "nested redefinition of %<struct %E%>", name); |
6374 | /* Don't bother to report "originally defined here" for a | |
6375 | nested redefinition; the original definition should be | |
6376 | obvious. */ | |
c42cc79e | 6377 | /* Don't create structures that contain themselves. */ |
6378 | ref = NULL_TREE; | |
5dad28f1 | 6379 | } |
51ef3909 | 6380 | } |
6381 | ||
c42cc79e | 6382 | /* Otherwise create a forward-reference just so the tag is in scope. */ |
6383 | ||
6384 | if (ref == NULL_TREE || TREE_CODE (ref) != code) | |
6385 | { | |
67be5043 | 6386 | ref = make_node (code); |
e60a6f7b | 6387 | pushtag (loc, name, ref); |
67be5043 | 6388 | } |
1cae46be | 6389 | |
51ef3909 | 6390 | C_TYPE_BEING_DEFINED (ref) = 1; |
93aaccf8 | 6391 | TYPE_PACKED (ref) = flag_pack_struct; |
0b09525f | 6392 | |
843bd2fa | 6393 | *enclosing_struct_parse_info = struct_parse_info; |
6394 | struct_parse_info = XNEW (struct c_struct_parse_info); | |
6395 | struct_parse_info->struct_types = VEC_alloc (tree, heap, 0); | |
6396 | struct_parse_info->fields = VEC_alloc (c_binding_ptr, heap, 0); | |
6397 | struct_parse_info->typedefs_seen = VEC_alloc (tree, heap, 0); | |
0b09525f | 6398 | |
6399 | /* FIXME: This will issue a warning for a use of a type defined | |
6400 | within a statement expr used within sizeof, et. al. This is not | |
6401 | terribly serious as C++ doesn't permit statement exprs within | |
6402 | sizeof anyhow. */ | |
6403 | if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof)) | |
6404 | warning_at (loc, OPT_Wc___compat, | |
6405 | "defining type in %qs expression is invalid in C++", | |
6406 | (in_sizeof | |
6407 | ? "sizeof" | |
6408 | : (in_typeof ? "typeof" : "alignof"))); | |
6409 | ||
51ef3909 | 6410 | return ref; |
6411 | } | |
6412 | ||
ac206aff | 6413 | /* Process the specs, declarator and width (NULL if omitted) |
51ef3909 | 6414 | of a structure component, returning a FIELD_DECL node. |
2d1a2840 | 6415 | WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node. |
e47ffaae | 6416 | DECL_ATTRS is as for grokdeclarator. |
51ef3909 | 6417 | |
d520c1f2 | 6418 | LOC is the location of the structure component. |
6419 | ||
51ef3909 | 6420 | This is done during the parsing of the struct declaration. |
6421 | The FIELD_DECL nodes are chained together and the lot of them | |
6422 | are ultimately passed to `build_struct' to make the RECORD_TYPE node. */ | |
6423 | ||
6424 | tree | |
d520c1f2 | 6425 | grokfield (location_t loc, |
6426 | struct c_declarator *declarator, struct c_declspecs *declspecs, | |
e47ffaae | 6427 | tree width, tree *decl_attrs) |
51ef3909 | 6428 | { |
6429 | tree value; | |
6430 | ||
ac206aff | 6431 | if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE |
6432 | && width == NULL_TREE) | |
7cb6c162 | 6433 | { |
07ebd091 | 6434 | /* This is an unnamed decl. |
6435 | ||
6436 | If we have something of the form "union { list } ;" then this | |
6437 | is the anonymous union extension. Similarly for struct. | |
6438 | ||
6439 | If this is something of the form "struct foo;", then | |
6440 | If MS extensions are enabled, this is handled as an | |
6441 | anonymous struct. | |
6442 | Otherwise this is a forward declaration of a structure tag. | |
6443 | ||
6444 | If this is something of the form "foo;" and foo is a TYPE_DECL, then | |
6445 | If MS extensions are enabled and foo names a structure, then | |
6446 | again this is an anonymous struct. | |
6447 | Otherwise this is an error. | |
6448 | ||
d716ce75 | 6449 | Oh what a horrid tangled web we weave. I wonder if MS consciously |
07ebd091 | 6450 | took this from Plan 9 or if it was an accident of implementation |
6451 | that took root before someone noticed the bug... */ | |
6452 | ||
9553111d | 6453 | tree type = declspecs->type; |
95ad7a71 | 6454 | bool type_ok = (TREE_CODE (type) == RECORD_TYPE |
6455 | || TREE_CODE (type) == UNION_TYPE); | |
6456 | bool ok = false; | |
188fc74c | 6457 | |
95ad7a71 | 6458 | if (type_ok |
490eec42 | 6459 | && (flag_ms_extensions || !declspecs->typedef_p)) |
07ebd091 | 6460 | { |
6461 | if (flag_ms_extensions) | |
95ad7a71 | 6462 | ok = true; |
07ebd091 | 6463 | else if (flag_iso) |
95ad7a71 | 6464 | ok = false; |
07ebd091 | 6465 | else if (TYPE_NAME (type) == NULL) |
95ad7a71 | 6466 | ok = true; |
07ebd091 | 6467 | else |
95ad7a71 | 6468 | ok = false; |
07ebd091 | 6469 | } |
95ad7a71 | 6470 | if (!ok) |
7cb6c162 | 6471 | { |
d520c1f2 | 6472 | pedwarn (loc, 0, "declaration does not declare anything"); |
7cb6c162 | 6473 | return NULL_TREE; |
6474 | } | |
d520c1f2 | 6475 | pedwarn (loc, OPT_pedantic, "ISO C doesn%'t support unnamed structs/unions"); |
7cb6c162 | 6476 | } |
6477 | ||
4a125bfc | 6478 | value = grokdeclarator (declarator, declspecs, FIELD, false, |
a75b1c71 | 6479 | width ? &width : NULL, decl_attrs, NULL, NULL, |
e47ffaae | 6480 | DEPRECATED_NORMAL); |
51ef3909 | 6481 | |
e60a6f7b | 6482 | finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE); |
b9d8dcc9 | 6483 | DECL_INITIAL (value) = width; |
51ef3909 | 6484 | |
843bd2fa | 6485 | if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE) |
6486 | { | |
6487 | /* If we currently have a binding for this field, set the | |
6488 | in_struct field in the binding, so that we warn about lookups | |
6489 | which find it. */ | |
6490 | struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value)); | |
6491 | if (b != NULL) | |
6492 | { | |
6493 | /* If the in_struct field is not yet set, push it on a list | |
6494 | to be cleared when this struct is finished. */ | |
6495 | if (!b->in_struct) | |
6496 | { | |
6497 | VEC_safe_push (c_binding_ptr, heap, | |
6498 | struct_parse_info->fields, b); | |
6499 | b->in_struct = 1; | |
6500 | } | |
6501 | } | |
6502 | } | |
6503 | ||
51ef3909 | 6504 | return value; |
6505 | } | |
6506 | \f | |
4d2aa485 | 6507 | /* Generate an error for any duplicate field names in FIELDLIST. Munge |
6508 | the list such that this does not present a problem later. */ | |
6509 | ||
6510 | static void | |
6511 | detect_field_duplicates (tree fieldlist) | |
6512 | { | |
6513 | tree x, y; | |
6514 | int timeout = 10; | |
6515 | ||
6516 | /* First, see if there are more than "a few" fields. | |
6517 | This is trivially true if there are zero or one fields. */ | |
6518 | if (!fieldlist) | |
6519 | return; | |
6520 | x = TREE_CHAIN (fieldlist); | |
6521 | if (!x) | |
6522 | return; | |
6523 | do { | |
6524 | timeout--; | |
6525 | x = TREE_CHAIN (x); | |
6526 | } while (timeout > 0 && x); | |
6527 | ||
6528 | /* If there were "few" fields, avoid the overhead of allocating | |
6529 | a hash table. Instead just do the nested traversal thing. */ | |
6530 | if (timeout > 0) | |
6531 | { | |
6532 | for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x)) | |
6533 | if (DECL_NAME (x)) | |
6534 | { | |
6535 | for (y = fieldlist; y != x; y = TREE_CHAIN (y)) | |
6536 | if (DECL_NAME (y) == DECL_NAME (x)) | |
6537 | { | |
3cf8b391 | 6538 | error ("duplicate member %q+D", x); |
4d2aa485 | 6539 | DECL_NAME (x) = NULL_TREE; |
6540 | } | |
6541 | } | |
6542 | } | |
6543 | else | |
6544 | { | |
6545 | htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL); | |
6546 | void **slot; | |
6547 | ||
6548 | for (x = fieldlist; x ; x = TREE_CHAIN (x)) | |
6549 | if ((y = DECL_NAME (x)) != 0) | |
6550 | { | |
6551 | slot = htab_find_slot (htab, y, INSERT); | |
6552 | if (*slot) | |
6553 | { | |
3cf8b391 | 6554 | error ("duplicate member %q+D", x); |
4d2aa485 | 6555 | DECL_NAME (x) = NULL_TREE; |
6556 | } | |
6557 | *slot = y; | |
6558 | } | |
6559 | ||
6560 | htab_delete (htab); | |
6561 | } | |
6562 | } | |
6563 | ||
843bd2fa | 6564 | /* Finish up struct info used by -Wc++-compat. */ |
6565 | ||
6566 | static void | |
6567 | warn_cxx_compat_finish_struct (tree fieldlist) | |
6568 | { | |
6569 | unsigned int ix; | |
6570 | tree x; | |
6571 | struct c_binding *b; | |
6572 | ||
6573 | /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in | |
6574 | the current struct. We do this now at the end of the struct | |
6575 | because the flag is used to issue visibility warnings, and we | |
6576 | only want to issue those warnings if the type is referenced | |
6577 | outside of the struct declaration. */ | |
6578 | for (ix = 0; VEC_iterate (tree, struct_parse_info->struct_types, ix, x); ++ix) | |
6579 | C_TYPE_DEFINED_IN_STRUCT (x) = 1; | |
6580 | ||
6581 | /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of | |
6582 | typedefs used when declaring fields in this struct. If the name | |
6583 | of any of the fields is also a typedef name then the struct would | |
6584 | not parse in C++, because the C++ lookup rules say that the | |
6585 | typedef name would be looked up in the context of the struct, and | |
6586 | would thus be the field rather than the typedef. */ | |
6587 | if (!VEC_empty (tree, struct_parse_info->typedefs_seen) | |
6588 | && fieldlist != NULL_TREE) | |
6589 | { | |
6590 | /* Use a pointer_set using the name of the typedef. We can use | |
6591 | a pointer_set because identifiers are interned. */ | |
6592 | struct pointer_set_t *tset = pointer_set_create (); | |
6593 | ||
6594 | for (ix = 0; | |
6595 | VEC_iterate (tree, struct_parse_info->typedefs_seen, ix, x); | |
6596 | ++ix) | |
6597 | pointer_set_insert (tset, DECL_NAME (x)); | |
6598 | ||
6599 | for (x = fieldlist; x != NULL_TREE; x = TREE_CHAIN (x)) | |
6600 | { | |
6601 | if (pointer_set_contains (tset, DECL_NAME (x))) | |
6602 | { | |
6603 | warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat, | |
6604 | ("using %qD as both field and typedef name is " | |
6605 | "invalid in C++"), | |
6606 | x); | |
6607 | /* FIXME: It would be nice to report the location where | |
6608 | the typedef name is used. */ | |
6609 | } | |
6610 | } | |
6611 | ||
6612 | pointer_set_destroy (tset); | |
6613 | } | |
6614 | ||
6615 | /* For each field which has a binding and which was not defined in | |
6616 | an enclosing struct, clear the in_struct field. */ | |
6617 | for (ix = 0; | |
6618 | VEC_iterate (c_binding_ptr, struct_parse_info->fields, ix, b); | |
6619 | ++ix) | |
6620 | b->in_struct = 0; | |
6621 | } | |
6622 | ||
51ef3909 | 6623 | /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T. |
e60a6f7b | 6624 | LOC is the location of the RECORD_TYPE or UNION_TYPE's definition. |
9c316e51 | 6625 | FIELDLIST is a chain of FIELD_DECL nodes for the fields. |
0b09525f | 6626 | ATTRIBUTES are attributes to be applied to the structure. |
6627 | ||
843bd2fa | 6628 | ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when |
6629 | the struct was started. */ | |
51ef3909 | 6630 | |
6631 | tree | |
e60a6f7b | 6632 | finish_struct (location_t loc, tree t, tree fieldlist, tree attributes, |
843bd2fa | 6633 | struct c_struct_parse_info *enclosing_struct_parse_info) |
51ef3909 | 6634 | { |
19cb6b50 | 6635 | tree x; |
393b349a | 6636 | bool toplevel = file_scope == current_scope; |
21c8999d | 6637 | int saw_named_field; |
51ef3909 | 6638 | |
6639 | /* If this type was previously laid out as a forward reference, | |
6640 | make sure we lay it out again. */ | |
6641 | ||
6642 | TYPE_SIZE (t) = 0; | |
6643 | ||
e3c541f0 | 6644 | decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); |
92b4910b | 6645 | |
328469d8 | 6646 | if (pedantic) |
6647 | { | |
6648 | for (x = fieldlist; x; x = TREE_CHAIN (x)) | |
6649 | if (DECL_NAME (x) != 0) | |
6650 | break; | |
6651 | ||
6652 | if (x == 0) | |
4ed53d3d | 6653 | { |
6654 | if (TREE_CODE (t) == UNION_TYPE) | |
6655 | { | |
6656 | if (fieldlist) | |
e60a6f7b | 6657 | pedwarn (loc, OPT_pedantic, "union has no named members"); |
4ed53d3d | 6658 | else |
e60a6f7b | 6659 | pedwarn (loc, OPT_pedantic, "union has no members"); |
4ed53d3d | 6660 | } |
6661 | else | |
6662 | { | |
6663 | if (fieldlist) | |
e60a6f7b | 6664 | pedwarn (loc, OPT_pedantic, "struct has no named members"); |
4ed53d3d | 6665 | else |
e60a6f7b | 6666 | pedwarn (loc, OPT_pedantic, "struct has no members"); |
4ed53d3d | 6667 | } |
6668 | } | |
328469d8 | 6669 | } |
51ef3909 | 6670 | |
b9d8dcc9 | 6671 | /* Install struct as DECL_CONTEXT of each field decl. |
4f7f7efd | 6672 | Also process specified field sizes, found in the DECL_INITIAL, |
6673 | storing 0 there after the type has been changed to precision equal | |
6674 | to its width, rather than the precision of the specified standard | |
6675 | type. (Correct layout requires the original type to have been preserved | |
6676 | until now.) */ | |
51ef3909 | 6677 | |
21c8999d | 6678 | saw_named_field = 0; |
51ef3909 | 6679 | for (x = fieldlist; x; x = TREE_CHAIN (x)) |
6680 | { | |
b4b63acb | 6681 | if (TREE_TYPE (x) == error_mark_node) |
6682 | continue; | |
6683 | ||
51ef3909 | 6684 | DECL_CONTEXT (x) = t; |
c2ab04f9 | 6685 | |
51ef3909 | 6686 | /* If any field is const, the structure type is pseudo-const. */ |
6687 | if (TREE_READONLY (x)) | |
6688 | C_TYPE_FIELDS_READONLY (t) = 1; | |
6689 | else | |
6690 | { | |
6691 | /* A field that is pseudo-const makes the structure likewise. */ | |
6692 | tree t1 = TREE_TYPE (x); | |
6693 | while (TREE_CODE (t1) == ARRAY_TYPE) | |
6694 | t1 = TREE_TYPE (t1); | |
6695 | if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE) | |
6696 | && C_TYPE_FIELDS_READONLY (t1)) | |
6697 | C_TYPE_FIELDS_READONLY (t) = 1; | |
6698 | } | |
6699 | ||
6700 | /* Any field that is volatile means variables of this type must be | |
6701 | treated in some ways as volatile. */ | |
6702 | if (TREE_THIS_VOLATILE (x)) | |
6703 | C_TYPE_FIELDS_VOLATILE (t) = 1; | |
6704 | ||
6705 | /* Any field of nominal variable size implies structure is too. */ | |
6706 | if (C_DECL_VARIABLE_SIZE (x)) | |
6707 | C_TYPE_VARIABLE_SIZE (t) = 1; | |
6708 | ||
b9d8dcc9 | 6709 | if (DECL_INITIAL (x)) |
6710 | { | |
2d1a2840 | 6711 | unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1); |
6712 | DECL_SIZE (x) = bitsize_int (width); | |
6713 | DECL_BIT_FIELD (x) = 1; | |
6714 | SET_DECL_C_BIT_FIELD (x); | |
b9d8dcc9 | 6715 | } |
6716 | ||
9fd767c5 | 6717 | if (TYPE_PACKED (t) |
6718 | && (DECL_BIT_FIELD (x) | |
6719 | || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT)) | |
6720 | DECL_PACKED (x) = 1; | |
6721 | ||
21c8999d | 6722 | /* Detect flexible array member in an invalid context. */ |
6723 | if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE | |
6724 | && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE | |
6725 | && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE | |
6726 | && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE) | |
6727 | { | |
6728 | if (TREE_CODE (t) == UNION_TYPE) | |
206d8357 | 6729 | { |
e60a6f7b | 6730 | error_at (DECL_SOURCE_LOCATION (x), |
712d2297 | 6731 | "flexible array member in union"); |
206d8357 | 6732 | TREE_TYPE (x) = error_mark_node; |
6733 | } | |
21c8999d | 6734 | else if (TREE_CHAIN (x) != NULL_TREE) |
206d8357 | 6735 | { |
e60a6f7b | 6736 | error_at (DECL_SOURCE_LOCATION (x), |
712d2297 | 6737 | "flexible array member not at end of struct"); |
206d8357 | 6738 | TREE_TYPE (x) = error_mark_node; |
6739 | } | |
84166705 | 6740 | else if (!saw_named_field) |
206d8357 | 6741 | { |
e60a6f7b | 6742 | error_at (DECL_SOURCE_LOCATION (x), |
712d2297 | 6743 | "flexible array member in otherwise empty struct"); |
206d8357 | 6744 | TREE_TYPE (x) = error_mark_node; |
6745 | } | |
21c8999d | 6746 | } |
ce09bc13 | 6747 | |
712d2297 | 6748 | if (pedantic && TREE_CODE (t) == RECORD_TYPE |
ce09bc13 | 6749 | && flexible_array_type_p (TREE_TYPE (x))) |
712d2297 | 6750 | pedwarn (DECL_SOURCE_LOCATION (x), OPT_pedantic, |
6751 | "invalid use of structure with flexible array member"); | |
ce09bc13 | 6752 | |
21c8999d | 6753 | if (DECL_NAME (x)) |
6754 | saw_named_field = 1; | |
a0c2c45b | 6755 | } |
51ef3909 | 6756 | |
4d2aa485 | 6757 | detect_field_duplicates (fieldlist); |
51ef3909 | 6758 | |
6759 | /* Now we have the nearly final fieldlist. Record it, | |
6760 | then lay out the structure or union (including the fields). */ | |
6761 | ||
6762 | TYPE_FIELDS (t) = fieldlist; | |
6763 | ||
6764 | layout_type (t); | |
6765 | ||
4f7f7efd | 6766 | /* Give bit-fields their proper types. */ |
813a136d | 6767 | { |
6768 | tree *fieldlistp = &fieldlist; | |
d4d302bd | 6769 | while (*fieldlistp) |
4f7f7efd | 6770 | if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp) |
6771 | && TREE_TYPE (*fieldlistp) != error_mark_node) | |
6772 | { | |
6773 | unsigned HOST_WIDE_INT width | |
6774 | = tree_low_cst (DECL_INITIAL (*fieldlistp), 1); | |
6775 | tree type = TREE_TYPE (*fieldlistp); | |
6776 | if (width != TYPE_PRECISION (type)) | |
24bdc387 | 6777 | { |
6778 | TREE_TYPE (*fieldlistp) | |
2ac1e110 | 6779 | = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type)); |
24bdc387 | 6780 | DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp)); |
6781 | } | |
4f7f7efd | 6782 | DECL_INITIAL (*fieldlistp) = 0; |
6783 | } | |
813a136d | 6784 | else |
6785 | fieldlistp = &TREE_CHAIN (*fieldlistp); | |
6786 | } | |
51ef3909 | 6787 | |
21c8999d | 6788 | /* Now we have the truly final field list. |
6789 | Store it in this type and in the variants. */ | |
51ef3909 | 6790 | |
6791 | TYPE_FIELDS (t) = fieldlist; | |
6792 | ||
860251be | 6793 | /* If there are lots of fields, sort so we can look through them fast. |
8b332087 | 6794 | We arbitrarily consider 16 or more elts to be "a lot". */ |
860251be | 6795 | |
6796 | { | |
6797 | int len = 0; | |
6798 | ||
6799 | for (x = fieldlist; x; x = TREE_CHAIN (x)) | |
6800 | { | |
a0c938f0 | 6801 | if (len > 15 || DECL_NAME (x) == NULL) |
6802 | break; | |
6803 | len += 1; | |
860251be | 6804 | } |
6805 | ||
6806 | if (len > 15) | |
6807 | { | |
a0c938f0 | 6808 | tree *field_array; |
6809 | struct lang_type *space; | |
6810 | struct sorted_fields_type *space2; | |
d9cf68bf | 6811 | |
a0c938f0 | 6812 | len += list_length (x); |
d9cf68bf | 6813 | |
a0c938f0 | 6814 | /* Use the same allocation policy here that make_node uses, to |
6815 | ensure that this lives as long as the rest of the struct decl. | |
6816 | All decls in an inline function need to be saved. */ | |
d9cf68bf | 6817 | |
a0c938f0 | 6818 | space = GGC_CNEW (struct lang_type); |
6819 | space2 = GGC_NEWVAR (struct sorted_fields_type, | |
9318f22c | 6820 | sizeof (struct sorted_fields_type) + len * sizeof (tree)); |
d9cf68bf | 6821 | |
a0c938f0 | 6822 | len = 0; |
860251be | 6823 | space->s = space2; |
6824 | field_array = &space2->elts[0]; | |
a0c938f0 | 6825 | for (x = fieldlist; x; x = TREE_CHAIN (x)) |
6826 | { | |
6827 | field_array[len++] = x; | |
6828 | ||
6829 | /* If there is anonymous struct or union, break out of the loop. */ | |
6830 | if (DECL_NAME (x) == NULL) | |
6831 | break; | |
6832 | } | |
6833 | /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */ | |
6834 | if (x == NULL) | |
6835 | { | |
6836 | TYPE_LANG_SPECIFIC (t) = space; | |
6837 | TYPE_LANG_SPECIFIC (t)->s->len = len; | |
6838 | field_array = TYPE_LANG_SPECIFIC (t)->s->elts; | |
6839 | qsort (field_array, len, sizeof (tree), field_decl_cmp); | |
6840 | } | |
860251be | 6841 | } |
6842 | } | |
d9cf68bf | 6843 | |
51ef3909 | 6844 | for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x)) |
6845 | { | |
6846 | TYPE_FIELDS (x) = TYPE_FIELDS (t); | |
6847 | TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t); | |
d8828f55 | 6848 | C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t); |
6849 | C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t); | |
6850 | C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t); | |
51ef3909 | 6851 | } |
6852 | ||
1b170db1 | 6853 | /* If this was supposed to be a transparent union, but we can't |
6854 | make it one, warn and turn off the flag. */ | |
6855 | if (TREE_CODE (t) == UNION_TYPE | |
6856 | && TYPE_TRANSPARENT_UNION (t) | |
89dec201 | 6857 | && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))) |
1b170db1 | 6858 | { |
6859 | TYPE_TRANSPARENT_UNION (t) = 0; | |
e60a6f7b | 6860 | warning_at (loc, 0, "union cannot be made transparent"); |
1b170db1 | 6861 | } |
6862 | ||
51ef3909 | 6863 | /* If this structure or union completes the type of any previous |
6864 | variable declaration, lay it out and output its rtl. */ | |
3e0a85c2 | 6865 | for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)); |
6866 | x; | |
6867 | x = TREE_CHAIN (x)) | |
51ef3909 | 6868 | { |
3e0a85c2 | 6869 | tree decl = TREE_VALUE (x); |
6870 | if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE) | |
6871 | layout_array_type (TREE_TYPE (decl)); | |
6872 | if (TREE_CODE (decl) != TYPE_DECL) | |
6873 | { | |
6874 | layout_decl (decl, 0); | |
6875 | if (c_dialect_objc ()) | |
6876 | objc_check_decl (decl); | |
b2c4af5e | 6877 | rest_of_decl_compilation (decl, toplevel, 0); |
84166705 | 6878 | if (!toplevel) |
3e0a85c2 | 6879 | expand_decl (decl); |
51ef3909 | 6880 | } |
6881 | } | |
3e0a85c2 | 6882 | C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0; |
51ef3909 | 6883 | |
51ef3909 | 6884 | /* Finish debugging output for this type. */ |
6885 | rest_of_type_compilation (t, toplevel); | |
6886 | ||
e5f813af | 6887 | /* If we're inside a function proper, i.e. not file-scope and not still |
6888 | parsing parameters, then arrange for the size of a variable sized type | |
6889 | to be bound now. */ | |
32d33ab2 | 6890 | if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE)) |
e60a6f7b | 6891 | add_stmt (build_stmt (loc, |
6892 | DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t))); | |
e5f813af | 6893 | |
843bd2fa | 6894 | if (warn_cxx_compat) |
6895 | warn_cxx_compat_finish_struct (fieldlist); | |
0b09525f | 6896 | |
843bd2fa | 6897 | VEC_free (tree, heap, struct_parse_info->struct_types); |
6898 | VEC_free (c_binding_ptr, heap, struct_parse_info->fields); | |
6899 | VEC_free (tree, heap, struct_parse_info->typedefs_seen); | |
6900 | XDELETE (struct_parse_info); | |
0b09525f | 6901 | |
843bd2fa | 6902 | struct_parse_info = enclosing_struct_parse_info; |
0b09525f | 6903 | |
6904 | /* If this struct is defined inside a struct, add it to | |
843bd2fa | 6905 | struct_types. */ |
6906 | if (warn_cxx_compat | |
6907 | && struct_parse_info != NULL | |
6908 | && !in_sizeof && !in_typeof && !in_alignof) | |
6909 | VEC_safe_push (tree, heap, struct_parse_info->struct_types, t); | |
0b09525f | 6910 | |
51ef3909 | 6911 | return t; |
6912 | } | |
6913 | ||
6914 | /* Lay out the type T, and its element type, and so on. */ | |
6915 | ||
6916 | static void | |
1cae46be | 6917 | layout_array_type (tree t) |
51ef3909 | 6918 | { |
6919 | if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE) | |
6920 | layout_array_type (TREE_TYPE (t)); | |
6921 | layout_type (t); | |
6922 | } | |
6923 | \f | |
6924 | /* Begin compiling the definition of an enumeration type. | |
6925 | NAME is its name (or null if anonymous). | |
e60a6f7b | 6926 | LOC is the enum's location. |
51ef3909 | 6927 | Returns the type object, as yet incomplete. |
6928 | Also records info about it so that build_enumerator | |
6929 | may be used to declare the individual values as they are read. */ | |
6930 | ||
6931 | tree | |
e60a6f7b | 6932 | start_enum (location_t loc, struct c_enum_contents *the_enum, tree name) |
51ef3909 | 6933 | { |
0b09525f | 6934 | tree enumtype = NULL_TREE; |
6935 | location_t enumloc = UNKNOWN_LOCATION; | |
51ef3909 | 6936 | |
6937 | /* If this is the real definition for a previous forward reference, | |
6938 | fill in the contents in the same object that used to be the | |
6939 | forward reference. */ | |
6940 | ||
0b09525f | 6941 | if (name != NULL_TREE) |
6942 | enumtype = lookup_tag (ENUMERAL_TYPE, name, 1, &enumloc); | |
51ef3909 | 6943 | |
6944 | if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE) | |
6945 | { | |
6946 | enumtype = make_node (ENUMERAL_TYPE); | |
e60a6f7b | 6947 | pushtag (loc, name, enumtype); |
51ef3909 | 6948 | } |
6949 | ||
5dad28f1 | 6950 | if (C_TYPE_BEING_DEFINED (enumtype)) |
0b09525f | 6951 | error_at (loc, "nested redefinition of %<enum %E%>", name); |
5dad28f1 | 6952 | |
51ef3909 | 6953 | C_TYPE_BEING_DEFINED (enumtype) = 1; |
6954 | ||
6955 | if (TYPE_VALUES (enumtype) != 0) | |
6956 | { | |
6957 | /* This enum is a named one that has been declared already. */ | |
0b09525f | 6958 | error_at (loc, "redeclaration of %<enum %E%>", name); |
6959 | if (enumloc != UNKNOWN_LOCATION) | |
6960 | inform (enumloc, "originally defined here"); | |
51ef3909 | 6961 | |
6962 | /* Completely replace its old definition. | |
6963 | The old enumerators remain defined, however. */ | |
6964 | TYPE_VALUES (enumtype) = 0; | |
6965 | } | |
6966 | ||
13c7079e | 6967 | the_enum->enum_next_value = integer_zero_node; |
6968 | the_enum->enum_overflow = 0; | |
51ef3909 | 6969 | |
93aaccf8 | 6970 | if (flag_short_enums) |
6971 | TYPE_PACKED (enumtype) = 1; | |
6972 | ||
0b09525f | 6973 | /* FIXME: This will issue a warning for a use of a type defined |
6974 | within sizeof in a statement expr. This is not terribly serious | |
6975 | as C++ doesn't permit statement exprs within sizeof anyhow. */ | |
6976 | if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof)) | |
6977 | warning_at (loc, OPT_Wc___compat, | |
6978 | "defining type in %qs expression is invalid in C++", | |
6979 | (in_sizeof | |
6980 | ? "sizeof" | |
6981 | : (in_typeof ? "typeof" : "alignof"))); | |
6982 | ||
51ef3909 | 6983 | return enumtype; |
6984 | } | |
6985 | ||
6986 | /* After processing and defining all the values of an enumeration type, | |
6987 | install their decls in the enumeration type and finish it off. | |
92b4910b | 6988 | ENUMTYPE is the type object, VALUES a list of decl-value pairs, |
6989 | and ATTRIBUTES are the specified attributes. | |
51ef3909 | 6990 | Returns ENUMTYPE. */ |
6991 | ||
6992 | tree | |
1cae46be | 6993 | finish_enum (tree enumtype, tree values, tree attributes) |
51ef3909 | 6994 | { |
19cb6b50 | 6995 | tree pair, tem; |
4ee9c684 | 6996 | tree minnode = 0, maxnode = 0; |
dcf6eb8b | 6997 | int precision, unsign; |
393b349a | 6998 | bool toplevel = (file_scope == current_scope); |
4ee9c684 | 6999 | struct lang_type *lt; |
51ef3909 | 7000 | |
e3c541f0 | 7001 | decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); |
92b4910b | 7002 | |
51ef3909 | 7003 | /* Calculate the maximum value of any enumerator in this type. */ |
7004 | ||
cbf39c1f | 7005 | if (values == error_mark_node) |
7006 | minnode = maxnode = integer_zero_node; | |
7007 | else | |
8b2f77e7 | 7008 | { |
dcf6eb8b | 7009 | minnode = maxnode = TREE_VALUE (values); |
7010 | for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair)) | |
8b2f77e7 | 7011 | { |
dcf6eb8b | 7012 | tree value = TREE_VALUE (pair); |
7013 | if (tree_int_cst_lt (maxnode, value)) | |
7014 | maxnode = value; | |
7015 | if (tree_int_cst_lt (value, minnode)) | |
7016 | minnode = value; | |
8b2f77e7 | 7017 | } |
dcf6eb8b | 7018 | } |
8b2f77e7 | 7019 | |
dcf6eb8b | 7020 | /* Construct the final type of this enumeration. It is the same |
7021 | as one of the integral types - the narrowest one that fits, except | |
7022 | that normally we only go as narrow as int - and signed iff any of | |
7023 | the values are negative. */ | |
7024 | unsign = (tree_int_cst_sgn (minnode) >= 0); | |
5485b959 | 7025 | precision = MAX (tree_int_cst_min_precision (minnode, unsign), |
7026 | tree_int_cst_min_precision (maxnode, unsign)); | |
3a648ab9 | 7027 | |
f219fbbf | 7028 | if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node)) |
dcf6eb8b | 7029 | { |
4ee9c684 | 7030 | tem = c_common_type_for_size (precision, unsign); |
7031 | if (tem == NULL) | |
f219fbbf | 7032 | { |
c3ceba8e | 7033 | warning (0, "enumeration values exceed range of largest integer"); |
4ee9c684 | 7034 | tem = long_long_integer_type_node; |
f219fbbf | 7035 | } |
8b2f77e7 | 7036 | } |
f219fbbf | 7037 | else |
4ee9c684 | 7038 | tem = unsign ? unsigned_type_node : integer_type_node; |
c1838b2a | 7039 | |
4ee9c684 | 7040 | TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem); |
7041 | TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem); | |
4ee9c684 | 7042 | TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem); |
51ef3909 | 7043 | TYPE_SIZE (enumtype) = 0; |
3a648ab9 | 7044 | |
7045 | /* If the precision of the type was specific with an attribute and it | |
7046 | was too small, give an error. Otherwise, use it. */ | |
7047 | if (TYPE_PRECISION (enumtype)) | |
7048 | { | |
7049 | if (precision > TYPE_PRECISION (enumtype)) | |
7050 | error ("specified mode too small for enumeral values"); | |
7051 | } | |
7052 | else | |
7053 | TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem); | |
7054 | ||
51ef3909 | 7055 | layout_type (enumtype); |
7056 | ||
cbf39c1f | 7057 | if (values != error_mark_node) |
a7925e0c | 7058 | { |
dcf6eb8b | 7059 | /* Change the type of the enumerators to be the enum type. We |
7060 | need to do this irrespective of the size of the enum, for | |
7061 | proper type checking. Replace the DECL_INITIALs of the | |
7062 | enumerators, and the value slots of the list, with copies | |
7063 | that have the enum type; they cannot be modified in place | |
7064 | because they may be shared (e.g. integer_zero_node) Finally, | |
7065 | change the purpose slots to point to the names of the decls. */ | |
cbf39c1f | 7066 | for (pair = values; pair; pair = TREE_CHAIN (pair)) |
7067 | { | |
dcf6eb8b | 7068 | tree enu = TREE_PURPOSE (pair); |
4ee9c684 | 7069 | tree ini = DECL_INITIAL (enu); |
51ef3909 | 7070 | |
dcf6eb8b | 7071 | TREE_TYPE (enu) = enumtype; |
c1838b2a | 7072 | |
7073 | /* The ISO C Standard mandates enumerators to have type int, | |
7074 | even though the underlying type of an enum type is | |
e8fc0d34 | 7075 | unspecified. However, GCC allows enumerators of any |
9fe4fa50 | 7076 | integer type as an extensions. build_enumerator() |
7077 | converts any enumerators that fit in an int to type int, | |
7078 | to avoid promotions to unsigned types when comparing | |
7079 | integers with enumerators that fit in the int range. | |
7080 | When -pedantic is given, build_enumerator() would have | |
7081 | already warned about those that don't fit. Here we | |
7082 | convert the rest to the enumerator type. */ | |
7083 | if (TREE_TYPE (ini) != integer_type_node) | |
7084 | ini = convert (enumtype, ini); | |
dcf6eb8b | 7085 | |
4ee9c684 | 7086 | DECL_INITIAL (enu) = ini; |
dcf6eb8b | 7087 | TREE_PURPOSE (pair) = DECL_NAME (enu); |
4ee9c684 | 7088 | TREE_VALUE (pair) = ini; |
dcf6eb8b | 7089 | } |
51ef3909 | 7090 | |
cbf39c1f | 7091 | TYPE_VALUES (enumtype) = values; |
7092 | } | |
51ef3909 | 7093 | |
4ee9c684 | 7094 | /* Record the min/max values so that we can warn about bit-field |
7095 | enumerations that are too small for the values. */ | |
9318f22c | 7096 | lt = GGC_CNEW (struct lang_type); |
4ee9c684 | 7097 | lt->enum_min = minnode; |
7098 | lt->enum_max = maxnode; | |
7099 | TYPE_LANG_SPECIFIC (enumtype) = lt; | |
7100 | ||
b97ea329 | 7101 | /* Fix up all variant types of this enum type. */ |
7102 | for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem)) | |
7103 | { | |
dcf6eb8b | 7104 | if (tem == enumtype) |
7105 | continue; | |
b97ea329 | 7106 | TYPE_VALUES (tem) = TYPE_VALUES (enumtype); |
7107 | TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype); | |
7108 | TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype); | |
7109 | TYPE_SIZE (tem) = TYPE_SIZE (enumtype); | |
24a7e611 | 7110 | TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype); |
342ad2d6 | 7111 | SET_TYPE_MODE (tem, TYPE_MODE (enumtype)); |
b97ea329 | 7112 | TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype); |
7113 | TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype); | |
aca14577 | 7114 | TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype); |
78a8ed03 | 7115 | TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype); |
4ee9c684 | 7116 | TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype); |
b97ea329 | 7117 | } |
7118 | ||
51ef3909 | 7119 | /* Finish debugging output for this type. */ |
7120 | rest_of_type_compilation (enumtype, toplevel); | |
7121 | ||
0b09525f | 7122 | /* If this enum is defined inside a struct, add it to |
843bd2fa | 7123 | struct_types. */ |
7124 | if (warn_cxx_compat | |
7125 | && struct_parse_info != NULL | |
7126 | && !in_sizeof && !in_typeof && !in_alignof) | |
7127 | VEC_safe_push (tree, heap, struct_parse_info->struct_types, enumtype); | |
0b09525f | 7128 | |
51ef3909 | 7129 | return enumtype; |
7130 | } | |
7131 | ||
7132 | /* Build and install a CONST_DECL for one value of the | |
7133 | current enumeration type (one that was begun with start_enum). | |
e60a6f7b | 7134 | LOC is the location of the enumerator. |
51ef3909 | 7135 | Return a tree-list containing the CONST_DECL and its value. |
7136 | Assignment of sequential values by default is handled here. */ | |
7137 | ||
7138 | tree | |
e60a6f7b | 7139 | build_enumerator (location_t loc, |
7140 | struct c_enum_contents *the_enum, tree name, tree value) | |
51ef3909 | 7141 | { |
19cb6b50 | 7142 | tree decl, type; |
51ef3909 | 7143 | |
7144 | /* Validate and default VALUE. */ | |
7145 | ||
ad5a5207 | 7146 | if (value != 0) |
d645d7e9 | 7147 | { |
393b349a | 7148 | /* Don't issue more errors for error_mark_node (i.e. an |
7149 | undeclared identifier) - just ignore the value expression. */ | |
7150 | if (value == error_mark_node) | |
7151 | value = 0; | |
bcb531e5 | 7152 | else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))) |
3b7bdb26 | 7153 | { |
e60a6f7b | 7154 | error_at (loc, "enumerator value for %qE is not an integer constant", |
7155 | name); | |
393b349a | 7156 | value = 0; |
3b7bdb26 | 7157 | } |
d645d7e9 | 7158 | else |
7159 | { | |
bcb531e5 | 7160 | if (TREE_CODE (value) != INTEGER_CST) |
7161 | { | |
7162 | value = c_fully_fold (value, false, NULL); | |
7163 | if (TREE_CODE (value) == INTEGER_CST) | |
e60a6f7b | 7164 | pedwarn (loc, OPT_pedantic, |
bcb531e5 | 7165 | "enumerator value for %qE is not an integer " |
7166 | "constant expression", name); | |
7167 | } | |
7168 | if (TREE_CODE (value) != INTEGER_CST) | |
7169 | { | |
7170 | error ("enumerator value for %qE is not an integer constant", | |
7171 | name); | |
7172 | value = 0; | |
7173 | } | |
7174 | else | |
7175 | { | |
7176 | value = default_conversion (value); | |
7177 | constant_expression_warning (value); | |
7178 | } | |
d645d7e9 | 7179 | } |
7180 | } | |
51ef3909 | 7181 | |
7182 | /* Default based on previous value. */ | |
7183 | /* It should no longer be possible to have NON_LVALUE_EXPR | |
7184 | in the default. */ | |
7185 | if (value == 0) | |
88c7c4d5 | 7186 | { |
13c7079e | 7187 | value = the_enum->enum_next_value; |
7188 | if (the_enum->enum_overflow) | |
e60a6f7b | 7189 | error_at (loc, "overflow in enumeration values"); |
88c7c4d5 | 7190 | } |
e8fc0d34 | 7191 | /* Even though the underlying type of an enum is unspecified, the |
7192 | type of enumeration constants is explicitly defined as int | |
7193 | (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as | |
7194 | an extension. */ | |
7195 | else if (!int_fits_type_p (value, integer_type_node)) | |
e60a6f7b | 7196 | pedwarn (loc, OPT_pedantic, |
21ca8540 | 7197 | "ISO C restricts enumerator values to range of %<int%>"); |
51ef3909 | 7198 | |
9fe4fa50 | 7199 | /* The ISO C Standard mandates enumerators to have type int, even |
7200 | though the underlying type of an enum type is unspecified. | |
7201 | However, GCC allows enumerators of any integer type as an | |
7202 | extensions. Here we convert any enumerators that fit in an int | |
7203 | to type int, to avoid promotions to unsigned types when comparing | |
7204 | integers with enumerators that fit in the int range. When | |
7205 | -pedantic is given, we would have already warned about those that | |
7206 | don't fit. We have to do this here rather than in finish_enum | |
7207 | because this value may be used to define more enumerators. */ | |
7208 | if (int_fits_type_p (value, integer_type_node)) | |
7209 | value = convert (integer_type_node, value); | |
7210 | ||
51ef3909 | 7211 | /* Set basis for default for next value. */ |
8e70fb09 | 7212 | the_enum->enum_next_value |
7213 | = build_binary_op | |
7214 | (EXPR_HAS_LOCATION (value) ? EXPR_LOCATION (value) : input_location, | |
7215 | PLUS_EXPR, value, integer_one_node, 0); | |
13c7079e | 7216 | the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value); |
51ef3909 | 7217 | |
7218 | /* Now create a declaration for the enum value name. */ | |
7219 | ||
a7925e0c | 7220 | type = TREE_TYPE (value); |
771d21fa | 7221 | type = c_common_type_for_size (MAX (TYPE_PRECISION (type), |
7222 | TYPE_PRECISION (integer_type_node)), | |
7223 | (TYPE_PRECISION (type) | |
7224 | >= TYPE_PRECISION (integer_type_node) | |
78a8ed03 | 7225 | && TYPE_UNSIGNED (type))); |
a7925e0c | 7226 | |
e60a6f7b | 7227 | decl = build_decl (loc, CONST_DECL, name, type); |
79efd58a | 7228 | DECL_INITIAL (decl) = convert (type, value); |
51ef3909 | 7229 | pushdecl (decl); |
7230 | ||
f8b540f2 | 7231 | return tree_cons (decl, value, NULL_TREE); |
51ef3909 | 7232 | } |
e41f0d80 | 7233 | |
51ef3909 | 7234 | \f |
7235 | /* Create the FUNCTION_DECL for a function definition. | |
b1d10e93 | 7236 | DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of |
e62f363b | 7237 | the declaration; they describe the function's name and the type it returns, |
51ef3909 | 7238 | but twisted together in a fashion that parallels the syntax of C. |
7239 | ||
7240 | This function creates a binding context for the function body | |
7241 | as well as setting up the FUNCTION_DECL in current_function_decl. | |
7242 | ||
7243 | Returns 1 on success. If the DECLARATOR is not suitable for a function | |
7244 | (it defines a datum instead), we return 0, which tells | |
f8b540f2 | 7245 | yyparse to report a parse error. */ |
51ef3909 | 7246 | |
7247 | int | |
9553111d | 7248 | start_function (struct c_declspecs *declspecs, struct c_declarator *declarator, |
ac206aff | 7249 | tree attributes) |
51ef3909 | 7250 | { |
7251 | tree decl1, old_decl; | |
540edea7 | 7252 | tree restype, resdecl; |
e60a6f7b | 7253 | location_t loc; |
51ef3909 | 7254 | |
a92771b8 | 7255 | current_function_returns_value = 0; /* Assume, until we see it does. */ |
51ef3909 | 7256 | current_function_returns_null = 0; |
af857942 | 7257 | current_function_returns_abnormally = 0; |
51ef3909 | 7258 | warn_about_return_type = 0; |
0375a275 | 7259 | c_switch_stack = NULL; |
7260 | ||
7261 | /* Indicate no valid break/continue context by setting these variables | |
7262 | to some non-null, non-label value. We'll notice and emit the proper | |
7263 | error message in c_finish_bc_stmt. */ | |
7264 | c_break_label = c_cont_label = size_zero_node; | |
51ef3909 | 7265 | |
81f218ec | 7266 | decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL, |
a75b1c71 | 7267 | &attributes, NULL, NULL, DEPRECATED_NORMAL); |
51ef3909 | 7268 | |
7269 | /* If the declarator is not suitable for a function definition, | |
7270 | cause a syntax error. */ | |
7271 | if (decl1 == 0) | |
f805d53d | 7272 | return 0; |
51ef3909 | 7273 | |
e60a6f7b | 7274 | loc = DECL_SOURCE_LOCATION (decl1); |
7275 | ||
9581e01c | 7276 | decl_attributes (&decl1, attributes, 0); |
82656fbf | 7277 | |
93f10b04 | 7278 | if (DECL_DECLARED_INLINE_P (decl1) |
7279 | && DECL_UNINLINABLE (decl1) | |
7280 | && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1))) | |
e60a6f7b | 7281 | warning_at (loc, OPT_Wattributes, |
7282 | "inline function %qD given attribute noinline", | |
7283 | decl1); | |
93f10b04 | 7284 | |
541e4101 | 7285 | /* Handle gnu_inline attribute. */ |
7286 | if (declspecs->inline_p | |
11950bdd | 7287 | && !flag_gnu89_inline |
541e4101 | 7288 | && TREE_CODE (decl1) == FUNCTION_DECL |
56f06eef | 7289 | && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1)) |
7290 | || current_function_decl)) | |
541e4101 | 7291 | { |
7292 | if (declspecs->storage_class != csc_static) | |
7293 | DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1); | |
7294 | } | |
541e4101 | 7295 | |
51ef3909 | 7296 | announce_function (decl1); |
7297 | ||
4b72716d | 7298 | if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1)))) |
51ef3909 | 7299 | { |
e60a6f7b | 7300 | error_at (loc, "return type is an incomplete type"); |
51ef3909 | 7301 | /* Make it return void instead. */ |
7302 | TREE_TYPE (decl1) | |
7303 | = build_function_type (void_type_node, | |
7304 | TYPE_ARG_TYPES (TREE_TYPE (decl1))); | |
7305 | } | |
7306 | ||
7307 | if (warn_about_return_type) | |
e60a6f7b | 7308 | pedwarn_c99 (loc, flag_isoc99 ? 0 |
8864917d | 7309 | : (warn_return_type ? OPT_Wreturn_type : OPT_Wimplicit_int), |
7310 | "return type defaults to %<int%>"); | |
51ef3909 | 7311 | |
51ef3909 | 7312 | /* Make the init_value nonzero so pushdecl knows this is not tentative. |
393b349a | 7313 | error_mark_node is replaced below (in pop_scope) with the BLOCK. */ |
51ef3909 | 7314 | DECL_INITIAL (decl1) = error_mark_node; |
7315 | ||
7316 | /* If this definition isn't a prototype and we had a prototype declaration | |
81506bec | 7317 | before, copy the arg type info from that prototype. */ |
393b349a | 7318 | old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope); |
4d5ac30e | 7319 | if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL) |
7320 | old_decl = 0; | |
3eafcdb5 | 7321 | current_function_prototype_locus = UNKNOWN_LOCATION; |
7322 | current_function_prototype_built_in = false; | |
7323 | current_function_prototype_arg_types = NULL_TREE; | |
7324 | if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0) | |
7325 | { | |
7326 | if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE | |
7327 | && comptypes (TREE_TYPE (TREE_TYPE (decl1)), | |
7328 | TREE_TYPE (TREE_TYPE (old_decl)))) | |
7329 | { | |
7330 | TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl), | |
7331 | TREE_TYPE (decl1)); | |
7332 | current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl); | |
7333 | current_function_prototype_built_in | |
7334 | = C_DECL_BUILTIN_PROTOTYPE (old_decl); | |
7335 | current_function_prototype_arg_types | |
7336 | = TYPE_ARG_TYPES (TREE_TYPE (decl1)); | |
7337 | } | |
7338 | if (TREE_PUBLIC (decl1)) | |
7339 | { | |
7340 | /* If there is an external prototype declaration of this | |
7341 | function, record its location but do not copy information | |
7342 | to this decl. This may be an invisible declaration | |
7343 | (built-in or in a scope which has finished) or simply | |
7344 | have more refined argument types than any declaration | |
7345 | found above. */ | |
7346 | struct c_binding *b; | |
7347 | for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed) | |
7348 | if (B_IN_SCOPE (b, external_scope)) | |
7349 | break; | |
7350 | if (b) | |
7351 | { | |
7352 | tree ext_decl, ext_type; | |
7353 | ext_decl = b->decl; | |
f805d53d | 7354 | ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl); |
3eafcdb5 | 7355 | if (TREE_CODE (ext_type) == FUNCTION_TYPE |
7356 | && comptypes (TREE_TYPE (TREE_TYPE (decl1)), | |
7357 | TREE_TYPE (ext_type))) | |
7358 | { | |
7359 | current_function_prototype_locus | |
7360 | = DECL_SOURCE_LOCATION (ext_decl); | |
7361 | current_function_prototype_built_in | |
7362 | = C_DECL_BUILTIN_PROTOTYPE (ext_decl); | |
7363 | current_function_prototype_arg_types | |
7364 | = TYPE_ARG_TYPES (ext_type); | |
7365 | } | |
7366 | } | |
7367 | } | |
06460bd1 | 7368 | } |
51ef3909 | 7369 | |
7370 | /* Optionally warn of old-fashioned def with no previous prototype. */ | |
7371 | if (warn_strict_prototypes | |
494fc9d0 | 7372 | && old_decl != error_mark_node |
51ef3909 | 7373 | && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0 |
31ddae9f | 7374 | && C_DECL_ISNT_PROTOTYPE (old_decl)) |
e60a6f7b | 7375 | warning_at (loc, OPT_Wstrict_prototypes, |
7376 | "function declaration isn%'t a prototype"); | |
51ef3909 | 7377 | /* Optionally warn of any global def with no previous prototype. */ |
7378 | else if (warn_missing_prototypes | |
494fc9d0 | 7379 | && old_decl != error_mark_node |
51ef3909 | 7380 | && TREE_PUBLIC (decl1) |
84166705 | 7381 | && !MAIN_NAME_P (DECL_NAME (decl1)) |
31ddae9f | 7382 | && C_DECL_ISNT_PROTOTYPE (old_decl)) |
e60a6f7b | 7383 | warning_at (loc, OPT_Wmissing_prototypes, |
7384 | "no previous prototype for %qD", decl1); | |
51ef3909 | 7385 | /* Optionally warn of any def with no previous prototype |
7386 | if the function has already been used. */ | |
7387 | else if (warn_missing_prototypes | |
494fc9d0 | 7388 | && old_decl != 0 |
7389 | && old_decl != error_mark_node | |
7390 | && TREE_USED (old_decl) | |
98f6402e | 7391 | && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0) |
e60a6f7b | 7392 | warning_at (loc, OPT_Wmissing_prototypes, |
7393 | "%qD was used with no prototype before its definition", decl1); | |
230c3e29 | 7394 | /* Optionally warn of any global def with no previous declaration. */ |
7395 | else if (warn_missing_declarations | |
7396 | && TREE_PUBLIC (decl1) | |
7397 | && old_decl == 0 | |
84166705 | 7398 | && !MAIN_NAME_P (DECL_NAME (decl1))) |
e60a6f7b | 7399 | warning_at (loc, OPT_Wmissing_declarations, |
7400 | "no previous declaration for %qD", | |
7401 | decl1); | |
230c3e29 | 7402 | /* Optionally warn of any def with no previous declaration |
7403 | if the function has already been used. */ | |
7404 | else if (warn_missing_declarations | |
494fc9d0 | 7405 | && old_decl != 0 |
7406 | && old_decl != error_mark_node | |
7407 | && TREE_USED (old_decl) | |
31ddae9f | 7408 | && C_DECL_IMPLICIT (old_decl)) |
e60a6f7b | 7409 | warning_at (loc, OPT_Wmissing_declarations, |
7410 | "%qD was used with no declaration before its definition", decl1); | |
51ef3909 | 7411 | |
51ef3909 | 7412 | /* This function exists in static storage. |
7413 | (This does not mean `static' in the C sense!) */ | |
7414 | TREE_STATIC (decl1) = 1; | |
7415 | ||
7416 | /* A nested function is not global. */ | |
7417 | if (current_function_decl != 0) | |
7418 | TREE_PUBLIC (decl1) = 0; | |
7419 | ||
418089c3 | 7420 | /* This is the earliest point at which we might know the assembler |
7421 | name of the function. Thus, if it's set before this, die horribly. */ | |
231bd014 | 7422 | gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1)); |
418089c3 | 7423 | |
7424 | /* If #pragma weak was used, mark the decl weak now. */ | |
393b349a | 7425 | if (current_scope == file_scope) |
418089c3 | 7426 | maybe_apply_pragma_weak (decl1); |
7427 | ||
4214af46 | 7428 | /* Warn for unlikely, improbable, or stupid declarations of `main'. */ |
23efcc02 | 7429 | if (warn_main && MAIN_NAME_P (DECL_NAME (decl1))) |
869a2569 | 7430 | { |
869a2569 | 7431 | if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1))) |
4214af46 | 7432 | != integer_type_node) |
e60a6f7b | 7433 | pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1); |
869a2569 | 7434 | |
23efcc02 | 7435 | check_main_parameter_types (decl1); |
869a2569 | 7436 | |
84166705 | 7437 | if (!TREE_PUBLIC (decl1)) |
e60a6f7b | 7438 | pedwarn (loc, OPT_Wmain, |
7439 | "%qD is normally a non-static function", decl1); | |
869a2569 | 7440 | } |
7441 | ||
51ef3909 | 7442 | /* Record the decl so that the function name is defined. |
7443 | If we already have a decl for this name, and it is a FUNCTION_DECL, | |
7444 | use the old decl. */ | |
7445 | ||
7446 | current_function_decl = pushdecl (decl1); | |
7447 | ||
393b349a | 7448 | push_scope (); |
2b652cf3 | 7449 | declare_parm_level (); |
51ef3909 | 7450 | |
51ef3909 | 7451 | restype = TREE_TYPE (TREE_TYPE (current_function_decl)); |
e60a6f7b | 7452 | resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype); |
540edea7 | 7453 | DECL_ARTIFICIAL (resdecl) = 1; |
7454 | DECL_IGNORED_P (resdecl) = 1; | |
7455 | DECL_RESULT (current_function_decl) = resdecl; | |
51ef3909 | 7456 | |
65b7f83f | 7457 | start_fname_decls (); |
1cae46be | 7458 | |
51ef3909 | 7459 | return 1; |
7460 | } | |
51ef3909 | 7461 | \f |
c917d901 | 7462 | /* Subroutine of store_parm_decls which handles new-style function |
7463 | definitions (prototype format). The parms already have decls, so we | |
7464 | need only record them as in effect and complain if any redundant | |
7465 | old-style parm decls were written. */ | |
38401f3c | 7466 | static void |
ac206aff | 7467 | store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info) |
51ef3909 | 7468 | { |
393b349a | 7469 | tree decl; |
51ef3909 | 7470 | |
393b349a | 7471 | if (current_scope->bindings) |
c917d901 | 7472 | { |
712d2297 | 7473 | error_at (DECL_SOURCE_LOCATION (fndecl), |
7474 | "old-style parameter declarations in prototyped " | |
7475 | "function definition"); | |
51ef3909 | 7476 | |
c917d901 | 7477 | /* Get rid of the old-style declarations. */ |
393b349a | 7478 | pop_scope (); |
7479 | push_scope (); | |
7480 | } | |
7481 | /* Don't issue this warning for nested functions, and don't issue this | |
7482 | warning if we got here because ARG_INFO_TYPES was error_mark_node | |
7483 | (this happens when a function definition has just an ellipsis in | |
7484 | its parameter list). */ | |
6bf97f82 | 7485 | else if (!in_system_header && !current_function_scope |
ac206aff | 7486 | && arg_info->types != error_mark_node) |
712d2297 | 7487 | warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional, |
7488 | "traditional C rejects ISO C style function definitions"); | |
51ef3909 | 7489 | |
f74be9a1 | 7490 | /* Now make all the parameter declarations visible in the function body. |
7491 | We can bypass most of the grunt work of pushdecl. */ | |
ac206aff | 7492 | for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl)) |
c917d901 | 7493 | { |
f74be9a1 | 7494 | DECL_CONTEXT (decl) = current_function_decl; |
393b349a | 7495 | if (DECL_NAME (decl)) |
40c4b476 | 7496 | { |
7497 | bind (DECL_NAME (decl), decl, current_scope, | |
6fb80942 | 7498 | /*invisible=*/false, /*nested=*/false, |
7499 | UNKNOWN_LOCATION); | |
40c4b476 | 7500 | if (!TREE_USED (decl)) |
7501 | warn_if_shadowing (decl); | |
7502 | } | |
c917d901 | 7503 | else |
712d2297 | 7504 | error_at (DECL_SOURCE_LOCATION (decl), "parameter name omitted"); |
c917d901 | 7505 | } |
5f3cead1 | 7506 | |
c917d901 | 7507 | /* Record the parameter list in the function declaration. */ |
ac206aff | 7508 | DECL_ARGUMENTS (fndecl) = arg_info->parms; |
51ef3909 | 7509 | |
c917d901 | 7510 | /* Now make all the ancillary declarations visible, likewise. */ |
ac206aff | 7511 | for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl)) |
f74be9a1 | 7512 | { |
7513 | DECL_CONTEXT (decl) = current_function_decl; | |
393b349a | 7514 | if (DECL_NAME (decl)) |
4194491a | 7515 | bind (DECL_NAME (decl), decl, current_scope, |
6fb80942 | 7516 | /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION); |
f74be9a1 | 7517 | } |
5f3cead1 | 7518 | |
c917d901 | 7519 | /* And all the tag declarations. */ |
ac206aff | 7520 | for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl)) |
f74be9a1 | 7521 | if (TREE_PURPOSE (decl)) |
4194491a | 7522 | bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope, |
6fb80942 | 7523 | /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION); |
c917d901 | 7524 | } |
ce467a73 | 7525 | |
c917d901 | 7526 | /* Subroutine of store_parm_decls which handles old-style function |
7527 | definitions (separate parameter list and declarations). */ | |
51ef3909 | 7528 | |
c917d901 | 7529 | static void |
ac206aff | 7530 | store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info) |
c917d901 | 7531 | { |
393b349a | 7532 | struct c_binding *b; |
f74be9a1 | 7533 | tree parm, decl, last; |
ac206aff | 7534 | tree parmids = arg_info->parms; |
5ded8c6f | 7535 | struct pointer_set_t *seen_args = pointer_set_create (); |
c917d901 | 7536 | |
efb9d9ee | 7537 | if (!in_system_header) |
e60a6f7b | 7538 | warning_at (DECL_SOURCE_LOCATION (fndecl), |
7539 | OPT_Wold_style_definition, "old-style function definition"); | |
393b349a | 7540 | |
c917d901 | 7541 | /* Match each formal parameter name with its declaration. Save each |
7542 | decl in the appropriate TREE_PURPOSE slot of the parmids chain. */ | |
7543 | for (parm = parmids; parm; parm = TREE_CHAIN (parm)) | |
7544 | { | |
7545 | if (TREE_VALUE (parm) == 0) | |
9c316e51 | 7546 | { |
e60a6f7b | 7547 | error_at (DECL_SOURCE_LOCATION (fndecl), |
7548 | "parameter name missing from parameter list"); | |
c917d901 | 7549 | TREE_PURPOSE (parm) = 0; |
7550 | continue; | |
9c316e51 | 7551 | } |
51ef3909 | 7552 | |
393b349a | 7553 | b = I_SYMBOL_BINDING (TREE_VALUE (parm)); |
4194491a | 7554 | if (b && B_IN_CURRENT_SCOPE (b)) |
51ef3909 | 7555 | { |
393b349a | 7556 | decl = b->decl; |
c917d901 | 7557 | /* If we got something other than a PARM_DECL it is an error. */ |
7558 | if (TREE_CODE (decl) != PARM_DECL) | |
e60a6f7b | 7559 | error_at (DECL_SOURCE_LOCATION (decl), |
7560 | "%qD declared as a non-parameter", decl); | |
c917d901 | 7561 | /* If the declaration is already marked, we have a duplicate |
7562 | name. Complain and ignore the duplicate. */ | |
5ded8c6f | 7563 | else if (pointer_set_contains (seen_args, decl)) |
51ef3909 | 7564 | { |
e60a6f7b | 7565 | error_at (DECL_SOURCE_LOCATION (decl), |
7566 | "multiple parameters named %qD", decl); | |
c917d901 | 7567 | TREE_PURPOSE (parm) = 0; |
7568 | continue; | |
51ef3909 | 7569 | } |
c917d901 | 7570 | /* If the declaration says "void", complain and turn it into |
7571 | an int. */ | |
7572 | else if (VOID_TYPE_P (TREE_TYPE (decl))) | |
51ef3909 | 7573 | { |
e60a6f7b | 7574 | error_at (DECL_SOURCE_LOCATION (decl), |
7575 | "parameter %qD declared with void type", decl); | |
c917d901 | 7576 | TREE_TYPE (decl) = integer_type_node; |
7577 | DECL_ARG_TYPE (decl) = integer_type_node; | |
7578 | layout_decl (decl, 0); | |
51ef3909 | 7579 | } |
40c4b476 | 7580 | warn_if_shadowing (decl); |
51ef3909 | 7581 | } |
c917d901 | 7582 | /* If no declaration found, default to int. */ |
7583 | else | |
51ef3909 | 7584 | { |
e60a6f7b | 7585 | /* FIXME diagnostics: This should be the location of the argument, |
7586 | not the FNDECL. E.g., for an old-style declaration | |
7587 | ||
7588 | int f10(v) { blah; } | |
7589 | ||
7590 | We should use the location of the V, not the F10. | |
7591 | Unfortunately, the V is an IDENTIFIER_NODE which has no | |
7592 | location. In the future we need locations for c_arg_info | |
7593 | entries. | |
7594 | ||
7595 | See gcc.dg/Wshadow-3.c for an example of this problem. */ | |
7596 | decl = build_decl (DECL_SOURCE_LOCATION (fndecl), | |
7597 | PARM_DECL, TREE_VALUE (parm), integer_type_node); | |
c917d901 | 7598 | DECL_ARG_TYPE (decl) = TREE_TYPE (decl); |
c917d901 | 7599 | pushdecl (decl); |
40c4b476 | 7600 | warn_if_shadowing (decl); |
c917d901 | 7601 | |
7602 | if (flag_isoc99) | |
e60a6f7b | 7603 | pedwarn (DECL_SOURCE_LOCATION (decl), |
7604 | 0, "type of %qD defaults to %<int%>", decl); | |
e1fd9ad2 | 7605 | else |
e60a6f7b | 7606 | warning_at (DECL_SOURCE_LOCATION (decl), |
7607 | OPT_Wmissing_parameter_type, | |
7608 | "type of %qD defaults to %<int%>", decl); | |
51ef3909 | 7609 | } |
7610 | ||
c917d901 | 7611 | TREE_PURPOSE (parm) = decl; |
5ded8c6f | 7612 | pointer_set_insert (seen_args, decl); |
51ef3909 | 7613 | } |
51ef3909 | 7614 | |
f74be9a1 | 7615 | /* Now examine the parms chain for incomplete declarations |
7616 | and declarations with no corresponding names. */ | |
51ef3909 | 7617 | |
393b349a | 7618 | for (b = current_scope->bindings; b; b = b->prev) |
c917d901 | 7619 | { |
393b349a | 7620 | parm = b->decl; |
7621 | if (TREE_CODE (parm) != PARM_DECL) | |
7622 | continue; | |
7623 | ||
69c2525c | 7624 | if (TREE_TYPE (parm) != error_mark_node |
7625 | && !COMPLETE_TYPE_P (TREE_TYPE (parm))) | |
51ef3909 | 7626 | { |
e60a6f7b | 7627 | error_at (DECL_SOURCE_LOCATION (parm), |
7628 | "parameter %qD has incomplete type", parm); | |
c917d901 | 7629 | TREE_TYPE (parm) = error_mark_node; |
7630 | } | |
51ef3909 | 7631 | |
5ded8c6f | 7632 | if (!pointer_set_contains (seen_args, parm)) |
c917d901 | 7633 | { |
e60a6f7b | 7634 | error_at (DECL_SOURCE_LOCATION (parm), |
7635 | "declaration for parameter %qD but no such parameter", | |
7636 | parm); | |
51ef3909 | 7637 | |
c917d901 | 7638 | /* Pretend the parameter was not missing. |
7639 | This gets us to a standard state and minimizes | |
7640 | further error messages. */ | |
7641 | parmids = chainon (parmids, tree_cons (parm, 0, 0)); | |
51ef3909 | 7642 | } |
c917d901 | 7643 | } |
51ef3909 | 7644 | |
c917d901 | 7645 | /* Chain the declarations together in the order of the list of |
7646 | names. Store that chain in the function decl, replacing the | |
f74be9a1 | 7647 | list of names. Update the current scope to match. */ |
c917d901 | 7648 | DECL_ARGUMENTS (fndecl) = 0; |
c917d901 | 7649 | |
f74be9a1 | 7650 | for (parm = parmids; parm; parm = TREE_CHAIN (parm)) |
7651 | if (TREE_PURPOSE (parm)) | |
7652 | break; | |
7653 | if (parm && TREE_PURPOSE (parm)) | |
7654 | { | |
7655 | last = TREE_PURPOSE (parm); | |
7656 | DECL_ARGUMENTS (fndecl) = last; | |
f74be9a1 | 7657 | |
7658 | for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm)) | |
7659 | if (TREE_PURPOSE (parm)) | |
7660 | { | |
7661 | TREE_CHAIN (last) = TREE_PURPOSE (parm); | |
7662 | last = TREE_PURPOSE (parm); | |
f74be9a1 | 7663 | } |
7664 | TREE_CHAIN (last) = 0; | |
7665 | } | |
51ef3909 | 7666 | |
5ded8c6f | 7667 | pointer_set_destroy (seen_args); |
7668 | ||
c917d901 | 7669 | /* If there was a previous prototype, |
7670 | set the DECL_ARG_TYPE of each argument according to | |
7671 | the type previously specified, and report any mismatches. */ | |
51ef3909 | 7672 | |
3eafcdb5 | 7673 | if (current_function_prototype_arg_types) |
c917d901 | 7674 | { |
7675 | tree type; | |
7676 | for (parm = DECL_ARGUMENTS (fndecl), | |
3eafcdb5 | 7677 | type = current_function_prototype_arg_types; |
9db402ec | 7678 | parm || (type && TREE_VALUE (type) != error_mark_node |
7679 | && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node)); | |
c917d901 | 7680 | parm = TREE_CHAIN (parm), type = TREE_CHAIN (type)) |
51ef3909 | 7681 | { |
c917d901 | 7682 | if (parm == 0 || type == 0 |
7683 | || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node) | |
51ef3909 | 7684 | { |
3eafcdb5 | 7685 | if (current_function_prototype_built_in) |
e60a6f7b | 7686 | warning_at (DECL_SOURCE_LOCATION (fndecl), |
7687 | 0, "number of arguments doesn%'t match " | |
7688 | "built-in prototype"); | |
3eafcdb5 | 7689 | else |
7690 | { | |
e60a6f7b | 7691 | /* FIXME diagnostics: This should be the location of |
7692 | FNDECL, but there is bug when a prototype is | |
7693 | declared inside function context, but defined | |
7694 | outside of it (e.g., gcc.dg/pr15698-2.c). In | |
7695 | which case FNDECL gets the location of the | |
7696 | prototype, not the definition. */ | |
7697 | error_at (input_location, | |
7698 | "number of arguments doesn%'t match prototype"); | |
7699 | ||
7700 | error_at (current_function_prototype_locus, | |
7701 | "prototype declaration"); | |
3eafcdb5 | 7702 | } |
c917d901 | 7703 | break; |
7704 | } | |
7705 | /* Type for passing arg must be consistent with that | |
7706 | declared for the arg. ISO C says we take the unqualified | |
7707 | type for parameters declared with qualified type. */ | |
e911c0fe | 7708 | if (TREE_TYPE (parm) != error_mark_node |
7709 | && TREE_TYPE (type) != error_mark_node | |
7710 | && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)), | |
7711 | TYPE_MAIN_VARIANT (TREE_VALUE (type)))) | |
c917d901 | 7712 | { |
7713 | if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) | |
7714 | == TYPE_MAIN_VARIANT (TREE_VALUE (type))) | |
51ef3909 | 7715 | { |
c917d901 | 7716 | /* Adjust argument to match prototype. E.g. a previous |
7717 | `int foo(float);' prototype causes | |
7718 | `int foo(x) float x; {...}' to be treated like | |
7719 | `int foo(float x) {...}'. This is particularly | |
7720 | useful for argument types like uid_t. */ | |
7721 | DECL_ARG_TYPE (parm) = TREE_TYPE (parm); | |
7722 | ||
45550790 | 7723 | if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl)) |
c917d901 | 7724 | && INTEGRAL_TYPE_P (TREE_TYPE (parm)) |
7725 | && TYPE_PRECISION (TREE_TYPE (parm)) | |
7726 | < TYPE_PRECISION (integer_type_node)) | |
7727 | DECL_ARG_TYPE (parm) = integer_type_node; | |
7728 | ||
8864917d | 7729 | /* ??? Is it possible to get here with a |
7730 | built-in prototype or will it always have | |
7731 | been diagnosed as conflicting with an | |
7732 | old-style definition and discarded? */ | |
7733 | if (current_function_prototype_built_in) | |
e60a6f7b | 7734 | warning_at (DECL_SOURCE_LOCATION (parm), |
7735 | OPT_pedantic, "promoted argument %qD " | |
7736 | "doesn%'t match built-in prototype", parm); | |
8864917d | 7737 | else |
06460bd1 | 7738 | { |
e60a6f7b | 7739 | pedwarn (DECL_SOURCE_LOCATION (parm), |
7740 | OPT_pedantic, "promoted argument %qD " | |
8864917d | 7741 | "doesn%'t match prototype", parm); |
21ca8540 | 7742 | pedwarn (current_function_prototype_locus, OPT_pedantic, |
7743 | "prototype declaration"); | |
06460bd1 | 7744 | } |
51ef3909 | 7745 | } |
c917d901 | 7746 | else |
7747 | { | |
3eafcdb5 | 7748 | if (current_function_prototype_built_in) |
e60a6f7b | 7749 | warning_at (DECL_SOURCE_LOCATION (parm), |
7750 | 0, "argument %qD doesn%'t match " | |
7751 | "built-in prototype", parm); | |
3eafcdb5 | 7752 | else |
7753 | { | |
e60a6f7b | 7754 | error_at (DECL_SOURCE_LOCATION (parm), |
7755 | "argument %qD doesn%'t match prototype", parm); | |
7756 | error_at (current_function_prototype_locus, | |
7757 | "prototype declaration"); | |
3eafcdb5 | 7758 | } |
c917d901 | 7759 | } |
51ef3909 | 7760 | } |
51ef3909 | 7761 | } |
c917d901 | 7762 | TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0; |
7763 | } | |
51ef3909 | 7764 | |
c917d901 | 7765 | /* Otherwise, create a prototype that would match. */ |
51ef3909 | 7766 | |
c917d901 | 7767 | else |
7768 | { | |
7769 | tree actual = 0, last = 0, type; | |
51ef3909 | 7770 | |
c917d901 | 7771 | for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm)) |
7772 | { | |
7773 | type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE); | |
51ef3909 | 7774 | if (last) |
7775 | TREE_CHAIN (last) = type; | |
7776 | else | |
7777 | actual = type; | |
c917d901 | 7778 | last = type; |
7779 | } | |
7780 | type = tree_cons (NULL_TREE, void_type_node, NULL_TREE); | |
7781 | if (last) | |
7782 | TREE_CHAIN (last) = type; | |
7783 | else | |
7784 | actual = type; | |
51ef3909 | 7785 | |
c917d901 | 7786 | /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES |
7787 | of the type of this function, but we need to avoid having this | |
7788 | affect the types of other similarly-typed functions, so we must | |
7789 | first force the generation of an identical (but separate) type | |
7790 | node for the relevant function type. The new node we create | |
7791 | will be a variant of the main variant of the original function | |
7792 | type. */ | |
c275c235 | 7793 | |
e086912e | 7794 | TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl)); |
c275c235 | 7795 | |
c917d901 | 7796 | TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual; |
7797 | } | |
c917d901 | 7798 | } |
7799 | ||
38401f3c | 7800 | /* Store parameter declarations passed in ARG_INFO into the current |
7801 | function declaration. */ | |
7802 | ||
7803 | void | |
ac206aff | 7804 | store_parm_decls_from (struct c_arg_info *arg_info) |
38401f3c | 7805 | { |
7806 | current_function_arg_info = arg_info; | |
7807 | store_parm_decls (); | |
7808 | } | |
7809 | ||
c917d901 | 7810 | /* Store the parameter declarations into the current function declaration. |
7811 | This is called after parsing the parameter declarations, before | |
7812 | digesting the body of the function. | |
7813 | ||
7814 | For an old-style definition, construct a prototype out of the old-style | |
7815 | parameter declarations and inject it into the function's type. */ | |
7816 | ||
7817 | void | |
7818 | store_parm_decls (void) | |
7819 | { | |
7820 | tree fndecl = current_function_decl; | |
731e6cbf | 7821 | bool proto; |
c917d901 | 7822 | |
a89ce285 | 7823 | /* The argument information block for FNDECL. */ |
ac206aff | 7824 | struct c_arg_info *arg_info = current_function_arg_info; |
731e6cbf | 7825 | current_function_arg_info = 0; |
a89ce285 | 7826 | |
393b349a | 7827 | /* True if this definition is written with a prototype. Note: |
7828 | despite C99 6.7.5.3p14, we can *not* treat an empty argument | |
7829 | list in a function definition as equivalent to (void) -- an | |
7830 | empty argument list specifies the function has no parameters, | |
7831 | but only (void) sets up a prototype for future calls. */ | |
ac206aff | 7832 | proto = arg_info->types != 0; |
c917d901 | 7833 | |
393b349a | 7834 | if (proto) |
a89ce285 | 7835 | store_parm_decls_newstyle (fndecl, arg_info); |
c917d901 | 7836 | else |
a89ce285 | 7837 | store_parm_decls_oldstyle (fndecl, arg_info); |
51ef3909 | 7838 | |
393b349a | 7839 | /* The next call to push_scope will be a function body. */ |
51ef3909 | 7840 | |
e69f6ec7 | 7841 | next_is_function_body = true; |
51ef3909 | 7842 | |
51ef3909 | 7843 | /* Write a record describing this function definition to the prototypes |
7844 | file (if requested). */ | |
7845 | ||
393b349a | 7846 | gen_aux_info_record (fndecl, 1, 0, proto); |
51ef3909 | 7847 | |
7848 | /* Initialize the RTL code for the function. */ | |
80f2ef47 | 7849 | allocate_struct_function (fndecl, false); |
51ef3909 | 7850 | |
e41f0d80 | 7851 | /* Begin the statement tree for this function. */ |
2363ef00 | 7852 | DECL_SAVED_TREE (fndecl) = push_stmt_list (); |
51ef3909 | 7853 | |
67c155cb | 7854 | /* ??? Insert the contents of the pending sizes list into the function |
6b275368 | 7855 | to be evaluated. The only reason left to have this is |
7856 | void foo(int n, int array[n++]) | |
7857 | because we throw away the array type in favor of a pointer type, and | |
7858 | thus won't naturally see the SAVE_EXPR containing the increment. All | |
7859 | other pending sizes would be handled by gimplify_parameters. */ | |
67c155cb | 7860 | { |
7861 | tree t; | |
7862 | for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t)) | |
7863 | add_stmt (TREE_VALUE (t)); | |
7864 | } | |
ce467a73 | 7865 | |
e41f0d80 | 7866 | /* Even though we're inside a function body, we still don't want to |
7867 | call expand_expr to calculate the size of a variable-sized array. | |
7868 | We haven't necessarily assigned RTL to all variables yet, so it's | |
7869 | not safe to try to expand expressions involving them. */ | |
18d50ae6 | 7870 | cfun->dont_save_pending_sizes_p = 1; |
51ef3909 | 7871 | } |
7872 | \f | |
1e8e9920 | 7873 | /* Emit diagnostics that require gimple input for detection. Operate on |
7874 | FNDECL and all its nested functions. */ | |
4ee9c684 | 7875 | |
7876 | static void | |
1e8e9920 | 7877 | c_gimple_diagnostics_recursively (tree fndecl) |
4ee9c684 | 7878 | { |
7879 | struct cgraph_node *cgn; | |
75a70cf9 | 7880 | gimple_seq body = gimple_body (fndecl); |
4ee9c684 | 7881 | |
7882 | /* Handle attribute((warn_unused_result)). Relies on gimple input. */ | |
75a70cf9 | 7883 | c_warn_unused_result (body); |
4ee9c684 | 7884 | |
1e8e9920 | 7885 | /* Notice when OpenMP structured block constraints are violated. */ |
7886 | if (flag_openmp) | |
7887 | diagnose_omp_structured_block_errors (fndecl); | |
7888 | ||
4ee9c684 | 7889 | /* Finalize all nested functions now. */ |
7890 | cgn = cgraph_node (fndecl); | |
7891 | for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested) | |
1e8e9920 | 7892 | c_gimple_diagnostics_recursively (cgn->decl); |
4ee9c684 | 7893 | } |
7894 | ||
51ef3909 | 7895 | /* Finish up a function declaration and compile that function |
7896 | all the way to assembler language output. The free the storage | |
7897 | for the function definition. | |
7898 | ||
2ff66ee0 | 7899 | This is called after parsing the body of the function definition. */ |
51ef3909 | 7900 | |
7901 | void | |
eb32e911 | 7902 | finish_function (void) |
51ef3909 | 7903 | { |
19cb6b50 | 7904 | tree fndecl = current_function_decl; |
51ef3909 | 7905 | |
45550790 | 7906 | if (TREE_CODE (fndecl) == FUNCTION_DECL |
7907 | && targetm.calls.promote_prototypes (TREE_TYPE (fndecl))) | |
7908 | { | |
7909 | tree args = DECL_ARGUMENTS (fndecl); | |
7910 | for (; args; args = TREE_CHAIN (args)) | |
a0c938f0 | 7911 | { |
7912 | tree type = TREE_TYPE (args); | |
7913 | if (INTEGRAL_TYPE_P (type) | |
7914 | && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) | |
7915 | DECL_ARG_TYPE (args) = integer_type_node; | |
7916 | } | |
45550790 | 7917 | } |
7918 | ||
35aab7c4 | 7919 | if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node) |
fcbb2ca1 | 7920 | BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl; |
51ef3909 | 7921 | |
7922 | /* Must mark the RESULT_DECL as being in this function. */ | |
7923 | ||
35aab7c4 | 7924 | if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node) |
fcbb2ca1 | 7925 | DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl; |
51ef3909 | 7926 | |
23efcc02 | 7927 | if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted |
7928 | && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) | |
7929 | == integer_type_node && flag_isoc99) | |
7930 | { | |
23efcc02 | 7931 | /* Hack. We don't want the middle-end to warn that this return |
7932 | is unreachable, so we mark its location as special. Using | |
7933 | UNKNOWN_LOCATION has the problem that it gets clobbered in | |
7934 | annotate_one_with_locus. A cleaner solution might be to | |
7935 | ensure ! should_carry_locus_p (stmt), but that needs a flag. | |
7936 | */ | |
e60a6f7b | 7937 | c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE); |
51ef3909 | 7938 | } |
1cae46be | 7939 | |
e41f0d80 | 7940 | /* Tie off the statement tree for this function. */ |
2363ef00 | 7941 | DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl)); |
7942 | ||
7943 | finish_fname_decls (); | |
af857942 | 7944 | |
7945 | /* Complain if there's just no return statement. */ | |
4edb3605 | 7946 | if (warn_return_type |
7947 | && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE | |
af857942 | 7948 | && !current_function_returns_value && !current_function_returns_null |
a53ff4c1 | 7949 | /* Don't complain if we are no-return. */ |
af857942 | 7950 | && !current_function_returns_abnormally |
7951 | /* Don't warn for main(). */ | |
7952 | && !MAIN_NAME_P (DECL_NAME (fndecl)) | |
7953 | /* Or if they didn't actually specify a return type. */ | |
7954 | && !C_FUNCTION_IMPLICIT_INT (fndecl) | |
6329636b | 7955 | /* Normally, with -Wreturn-type, flow will complain, but we might |
7956 | optimize out static functions. */ | |
7957 | && !TREE_PUBLIC (fndecl)) | |
6a13f013 | 7958 | { |
6bf97f82 | 7959 | warning (OPT_Wreturn_type, |
7960 | "no return statement in function returning non-void"); | |
6a13f013 | 7961 | TREE_NO_WARNING (fndecl) = 1; |
7962 | } | |
af857942 | 7963 | |
4ee9c684 | 7964 | /* Store the end of the function, so that we get good line number |
7965 | info for the epilogue. */ | |
7966 | cfun->function_end_locus = input_location; | |
7967 | ||
3aa0c315 | 7968 | /* Finalize the ELF visibility for the function. */ |
7969 | c_determine_visibility (fndecl); | |
7970 | ||
ebb7d626 | 7971 | /* For GNU C extern inline functions disregard inline limits. */ |
7972 | if (DECL_EXTERNAL (fndecl) | |
7973 | && DECL_DECLARED_INLINE_P (fndecl)) | |
7974 | DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1; | |
7975 | ||
4ee9c684 | 7976 | /* Genericize before inlining. Delay genericizing nested functions |
7977 | until their parent function is genericized. Since finalizing | |
7978 | requires GENERIC, delay that as well. */ | |
14338e9a | 7979 | |
8a1f0315 | 7980 | if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node |
7981 | && !undef_nested_function) | |
4ee9c684 | 7982 | { |
7983 | if (!decl_function_context (fndecl)) | |
a0c938f0 | 7984 | { |
7985 | c_genericize (fndecl); | |
7986 | c_gimple_diagnostics_recursively (fndecl); | |
7a2371fd | 7987 | |
7988 | /* ??? Objc emits functions after finalizing the compilation unit. | |
7989 | This should be cleaned up later and this conditional removed. */ | |
7990 | if (cgraph_global_info_ready) | |
7991 | { | |
84e10000 | 7992 | cgraph_add_new_function (fndecl, false); |
7a2371fd | 7993 | return; |
7994 | } | |
7a2371fd | 7995 | cgraph_finalize_function (fndecl, false); |
a0c938f0 | 7996 | } |
4ee9c684 | 7997 | else |
a0c938f0 | 7998 | { |
7999 | /* Register this function with cgraph just far enough to get it | |
8000 | added to our parent's nested function list. Handy, since the | |
8001 | C front end doesn't have such a list. */ | |
8002 | (void) cgraph_node (fndecl); | |
8003 | } | |
4ee9c684 | 8004 | } |
8005 | ||
8a1f0315 | 8006 | if (!decl_function_context (fndecl)) |
8007 | undef_nested_function = false; | |
8008 | ||
cbc44df5 | 8009 | /* We're leaving the context of this function, so zap cfun. |
4ee9c684 | 8010 | It's still in DECL_STRUCT_FUNCTION, and we'll restore it in |
cbc44df5 | 8011 | tree_rest_of_compilation. */ |
87d4aa85 | 8012 | set_cfun (NULL); |
2ff66ee0 | 8013 | current_function_decl = NULL; |
e41f0d80 | 8014 | } |
51ef3909 | 8015 | \f |
5e4f9988 | 8016 | /* Check the declarations given in a for-loop for satisfying the C99 |
e60a6f7b | 8017 | constraints. If exactly one such decl is found, return it. LOC is |
8018 | the location of the opening parenthesis of the for loop. */ | |
1e8e9920 | 8019 | |
8020 | tree | |
e60a6f7b | 8021 | check_for_loop_decls (location_t loc) |
5e4f9988 | 8022 | { |
393b349a | 8023 | struct c_binding *b; |
1e8e9920 | 8024 | tree one_decl = NULL_TREE; |
8025 | int n_decls = 0; | |
8026 | ||
5e4f9988 | 8027 | if (!flag_isoc99) |
8028 | { | |
2292dd7a | 8029 | static bool hint = true; |
5e4f9988 | 8030 | /* If we get here, declarations have been used in a for loop without |
8031 | the C99 for loop scope. This doesn't make much sense, so don't | |
8032 | allow it. */ | |
e60a6f7b | 8033 | error_at (loc, "%<for%> loop initial declarations " |
8034 | "are only allowed in C99 mode"); | |
2292dd7a | 8035 | if (hint) |
8036 | { | |
e60a6f7b | 8037 | inform (loc, |
2292dd7a | 8038 | "use option -std=c99 or -std=gnu99 to compile your code"); |
8039 | hint = false; | |
8040 | } | |
1e8e9920 | 8041 | return NULL_TREE; |
5e4f9988 | 8042 | } |
8043 | /* C99 subclause 6.8.5 paragraph 3: | |
8044 | ||
8045 | [#3] The declaration part of a for statement shall only | |
8046 | declare identifiers for objects having storage class auto or | |
8047 | register. | |
8048 | ||
8049 | It isn't clear whether, in this sentence, "identifiers" binds to | |
8050 | "shall only declare" or to "objects" - that is, whether all identifiers | |
8051 | declared must be identifiers for objects, or whether the restriction | |
8052 | only applies to those that are. (A question on this in comp.std.c | |
8053 | in November 2000 received no answer.) We implement the strictest | |
8054 | interpretation, to avoid creating an extension which later causes | |
8055 | problems. */ | |
8056 | ||
393b349a | 8057 | for (b = current_scope->bindings; b; b = b->prev) |
5e4f9988 | 8058 | { |
393b349a | 8059 | tree id = b->id; |
8060 | tree decl = b->decl; | |
1a5a5cd8 | 8061 | |
393b349a | 8062 | if (!id) |
8063 | continue; | |
8064 | ||
8065 | switch (TREE_CODE (decl)) | |
8066 | { | |
8067 | case VAR_DECL: | |
e60a6f7b | 8068 | { |
8069 | location_t decl_loc = DECL_SOURCE_LOCATION (decl); | |
8070 | if (TREE_STATIC (decl)) | |
8071 | error_at (decl_loc, | |
8072 | "declaration of static variable %qD in %<for%> loop " | |
8073 | "initial declaration", decl); | |
8074 | else if (DECL_EXTERNAL (decl)) | |
8075 | error_at (decl_loc, | |
8076 | "declaration of %<extern%> variable %qD in %<for%> loop " | |
8077 | "initial declaration", decl); | |
8078 | } | |
393b349a | 8079 | break; |
8080 | ||
8081 | case RECORD_TYPE: | |
e60a6f7b | 8082 | error_at (loc, |
8083 | "%<struct %E%> declared in %<for%> loop initial " | |
8084 | "declaration", id); | |
393b349a | 8085 | break; |
8086 | case UNION_TYPE: | |
e60a6f7b | 8087 | error_at (loc, |
8088 | "%<union %E%> declared in %<for%> loop initial declaration", | |
8089 | id); | |
393b349a | 8090 | break; |
8091 | case ENUMERAL_TYPE: | |
e60a6f7b | 8092 | error_at (loc, "%<enum %E%> declared in %<for%> loop " |
8093 | "initial declaration", id); | |
393b349a | 8094 | break; |
8095 | default: | |
e60a6f7b | 8096 | error_at (loc, "declaration of non-variable " |
8097 | "%qD in %<for%> loop initial declaration", decl); | |
393b349a | 8098 | } |
1e8e9920 | 8099 | |
8100 | n_decls++; | |
8101 | one_decl = decl; | |
5e4f9988 | 8102 | } |
1e8e9920 | 8103 | |
8104 | return n_decls == 1 ? one_decl : NULL_TREE; | |
5e4f9988 | 8105 | } |
8106 | \f | |
51ef3909 | 8107 | /* Save and reinitialize the variables |
8108 | used during compilation of a C function. */ | |
8109 | ||
8110 | void | |
d2764e2d | 8111 | c_push_function_context (void) |
51ef3909 | 8112 | { |
1f3233d1 | 8113 | struct language_function *p; |
9318f22c | 8114 | p = GGC_NEW (struct language_function); |
d2764e2d | 8115 | cfun->language = p; |
51ef3909 | 8116 | |
e41f0d80 | 8117 | p->base.x_stmt_tree = c_stmt_tree; |
0375a275 | 8118 | p->x_break_label = c_break_label; |
8119 | p->x_cont_label = c_cont_label; | |
8120 | p->x_switch_stack = c_switch_stack; | |
731e6cbf | 8121 | p->arg_info = current_function_arg_info; |
51ef3909 | 8122 | p->returns_value = current_function_returns_value; |
8123 | p->returns_null = current_function_returns_null; | |
af857942 | 8124 | p->returns_abnormally = current_function_returns_abnormally; |
51ef3909 | 8125 | p->warn_about_return_type = warn_about_return_type; |
d2764e2d | 8126 | |
8127 | push_function_context (); | |
51ef3909 | 8128 | } |
8129 | ||
8130 | /* Restore the variables used during compilation of a C function. */ | |
8131 | ||
8132 | void | |
d2764e2d | 8133 | c_pop_function_context (void) |
51ef3909 | 8134 | { |
d2764e2d | 8135 | struct language_function *p; |
8136 | ||
8137 | pop_function_context (); | |
8138 | p = cfun->language; | |
8139 | cfun->language = NULL; | |
51ef3909 | 8140 | |
cbc44df5 | 8141 | if (DECL_STRUCT_FUNCTION (current_function_decl) == 0 |
e41f0d80 | 8142 | && DECL_SAVED_TREE (current_function_decl) == NULL_TREE) |
51ef3909 | 8143 | { |
8144 | /* Stop pointing to the local nodes about to be freed. */ | |
8145 | /* But DECL_INITIAL must remain nonzero so we know this | |
8146 | was an actual function definition. */ | |
8147 | DECL_INITIAL (current_function_decl) = error_mark_node; | |
8148 | DECL_ARGUMENTS (current_function_decl) = 0; | |
8149 | } | |
8150 | ||
e41f0d80 | 8151 | c_stmt_tree = p->base.x_stmt_tree; |
0375a275 | 8152 | c_break_label = p->x_break_label; |
8153 | c_cont_label = p->x_cont_label; | |
8154 | c_switch_stack = p->x_switch_stack; | |
731e6cbf | 8155 | current_function_arg_info = p->arg_info; |
51ef3909 | 8156 | current_function_returns_value = p->returns_value; |
8157 | current_function_returns_null = p->returns_null; | |
af857942 | 8158 | current_function_returns_abnormally = p->returns_abnormally; |
51ef3909 | 8159 | warn_about_return_type = p->warn_about_return_type; |
dc12af01 | 8160 | } |
8161 | ||
dbc42b78 | 8162 | /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */ |
c0981059 | 8163 | |
8164 | void | |
1cae46be | 8165 | c_dup_lang_specific_decl (tree decl) |
c0981059 | 8166 | { |
e41f0d80 | 8167 | struct lang_decl *ld; |
8168 | ||
8169 | if (!DECL_LANG_SPECIFIC (decl)) | |
8170 | return; | |
8171 | ||
9318f22c | 8172 | ld = GGC_NEW (struct lang_decl); |
f0af5a88 | 8173 | memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl)); |
e41f0d80 | 8174 | DECL_LANG_SPECIFIC (decl) = ld; |
c0981059 | 8175 | } |
dc12af01 | 8176 | |
5c3247a9 | 8177 | /* The functions below are required for functionality of doing |
8178 | function at once processing in the C front end. Currently these | |
8179 | functions are not called from anywhere in the C front end, but as | |
4214af46 | 8180 | these changes continue, that will change. */ |
5c3247a9 | 8181 | |
a08e60ae | 8182 | /* Returns the stmt_tree (if any) to which statements are currently |
8183 | being added. If there is no active statement-tree, NULL is | |
8184 | returned. */ | |
8185 | ||
8186 | stmt_tree | |
1cae46be | 8187 | current_stmt_tree (void) |
a08e60ae | 8188 | { |
e41f0d80 | 8189 | return &c_stmt_tree; |
8190 | } | |
8191 | ||
31ddae9f | 8192 | /* Return the global value of T as a symbol. */ |
6bf5ed8d | 8193 | |
8194 | tree | |
1cae46be | 8195 | identifier_global_value (tree t) |
6bf5ed8d | 8196 | { |
393b349a | 8197 | struct c_binding *b; |
31ddae9f | 8198 | |
393b349a | 8199 | for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed) |
4194491a | 8200 | if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b)) |
393b349a | 8201 | return b->decl; |
31ddae9f | 8202 | |
31ddae9f | 8203 | return 0; |
6bf5ed8d | 8204 | } |
174fcc61 | 8205 | |
8206 | /* Record a builtin type for C. If NAME is non-NULL, it is the name used; | |
8207 | otherwise the name is found in ridpointers from RID_INDEX. */ | |
8208 | ||
8209 | void | |
1cae46be | 8210 | record_builtin_type (enum rid rid_index, const char *name, tree type) |
174fcc61 | 8211 | { |
f62468fc | 8212 | tree id, decl; |
174fcc61 | 8213 | if (name == 0) |
8214 | id = ridpointers[(int) rid_index]; | |
8215 | else | |
8216 | id = get_identifier (name); | |
e60a6f7b | 8217 | decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type); |
f62468fc | 8218 | pushdecl (decl); |
8219 | if (debug_hooks->type_decl) | |
8220 | debug_hooks->type_decl (decl, false); | |
174fcc61 | 8221 | } |
8222 | ||
8223 | /* Build the void_list_node (void_type_node having been created). */ | |
8224 | tree | |
1cae46be | 8225 | build_void_list_node (void) |
174fcc61 | 8226 | { |
8227 | tree t = build_tree_list (NULL_TREE, void_type_node); | |
8228 | return t; | |
8229 | } | |
90cc7820 | 8230 | |
ac206aff | 8231 | /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */ |
0a423af5 | 8232 | |
ac206aff | 8233 | struct c_parm * |
9553111d | 8234 | build_c_parm (struct c_declspecs *specs, tree attrs, |
8235 | struct c_declarator *declarator) | |
0a423af5 | 8236 | { |
ac206aff | 8237 | struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm); |
8238 | ret->specs = specs; | |
8239 | ret->attrs = attrs; | |
8240 | ret->declarator = declarator; | |
8241 | return ret; | |
0a423af5 | 8242 | } |
8243 | ||
8244 | /* Return a declarator with nested attributes. TARGET is the inner | |
8245 | declarator to which these attributes apply. ATTRS are the | |
8246 | attributes. */ | |
8247 | ||
ac206aff | 8248 | struct c_declarator * |
8249 | build_attrs_declarator (tree attrs, struct c_declarator *target) | |
0a423af5 | 8250 | { |
ac206aff | 8251 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); |
8252 | ret->kind = cdk_attrs; | |
8253 | ret->declarator = target; | |
8254 | ret->u.attrs = attrs; | |
8255 | return ret; | |
0a423af5 | 8256 | } |
8257 | ||
8258 | /* Return a declarator for a function with arguments specified by ARGS | |
8259 | and return type specified by TARGET. */ | |
8260 | ||
ac206aff | 8261 | struct c_declarator * |
8262 | build_function_declarator (struct c_arg_info *args, | |
8263 | struct c_declarator *target) | |
0a423af5 | 8264 | { |
ac206aff | 8265 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); |
8266 | ret->kind = cdk_function; | |
8267 | ret->declarator = target; | |
8268 | ret->u.arg_info = args; | |
8269 | return ret; | |
8270 | } | |
8271 | ||
8272 | /* Return a declarator for the identifier IDENT (which may be | |
8273 | NULL_TREE for an abstract declarator). */ | |
8274 | ||
8275 | struct c_declarator * | |
8276 | build_id_declarator (tree ident) | |
8277 | { | |
8278 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); | |
8279 | ret->kind = cdk_id; | |
8280 | ret->declarator = 0; | |
8281 | ret->u.id = ident; | |
6342afac | 8282 | /* Default value - may get reset to a more precise location. */ |
8283 | ret->id_loc = input_location; | |
ac206aff | 8284 | return ret; |
0a423af5 | 8285 | } |
8286 | ||
90cc7820 | 8287 | /* Return something to represent absolute declarators containing a *. |
8288 | TARGET is the absolute declarator that the * contains. | |
9553111d | 8289 | TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes |
8290 | to apply to the pointer type. */ | |
90cc7820 | 8291 | |
ac206aff | 8292 | struct c_declarator * |
9553111d | 8293 | make_pointer_declarator (struct c_declspecs *type_quals_attrs, |
8294 | struct c_declarator *target) | |
90cc7820 | 8295 | { |
9553111d | 8296 | tree attrs; |
bb476216 | 8297 | int quals = 0; |
ac206aff | 8298 | struct c_declarator *itarget = target; |
8299 | struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); | |
9553111d | 8300 | if (type_quals_attrs) |
8301 | { | |
8302 | attrs = type_quals_attrs->attrs; | |
bb476216 | 8303 | quals = quals_from_declspecs (type_quals_attrs); |
9553111d | 8304 | if (attrs != NULL_TREE) |
8305 | itarget = build_attrs_declarator (attrs, target); | |
8306 | } | |
ac206aff | 8307 | ret->kind = cdk_pointer; |
8308 | ret->declarator = itarget; | |
bb476216 | 8309 | ret->u.pointer_quals = quals; |
9553111d | 8310 | return ret; |
8311 | } | |
8312 | ||
8313 | /* Return a pointer to a structure for an empty list of declaration | |
8314 | specifiers. */ | |
8315 | ||
8316 | struct c_declspecs * | |
8317 | build_null_declspecs (void) | |
8318 | { | |
8319 | struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs); | |
8320 | ret->type = 0; | |
a75b1c71 | 8321 | ret->expr = 0; |
9553111d | 8322 | ret->decl_attr = 0; |
8323 | ret->attrs = 0; | |
70dd11f7 | 8324 | ret->typespec_word = cts_none; |
feb04535 | 8325 | ret->storage_class = csc_none; |
a75b1c71 | 8326 | ret->expr_const_operands = true; |
1576dec7 | 8327 | ret->declspecs_seen_p = false; |
8328 | ret->type_seen_p = false; | |
9553111d | 8329 | ret->non_sc_seen_p = false; |
490eec42 | 8330 | ret->typedef_p = false; |
19702c1d | 8331 | ret->tag_defined_p = false; |
70dd11f7 | 8332 | ret->explicit_signed_p = false; |
9553111d | 8333 | ret->deprecated_p = false; |
70dd11f7 | 8334 | ret->default_int_p = false; |
8335 | ret->long_p = false; | |
9553111d | 8336 | ret->long_long_p = false; |
70dd11f7 | 8337 | ret->short_p = false; |
8338 | ret->signed_p = false; | |
8339 | ret->unsigned_p = false; | |
8340 | ret->complex_p = false; | |
feb04535 | 8341 | ret->inline_p = false; |
8342 | ret->thread_p = false; | |
bb476216 | 8343 | ret->const_p = false; |
8344 | ret->volatile_p = false; | |
8345 | ret->restrict_p = false; | |
9421ebb9 | 8346 | ret->saturating_p = false; |
ac206aff | 8347 | return ret; |
90cc7820 | 8348 | } |
1f3233d1 | 8349 | |
9553111d | 8350 | /* Add the type qualifier QUAL to the declaration specifiers SPECS, |
8351 | returning SPECS. */ | |
8352 | ||
8353 | struct c_declspecs * | |
8354 | declspecs_add_qual (struct c_declspecs *specs, tree qual) | |
8355 | { | |
8356 | enum rid i; | |
bb476216 | 8357 | bool dupe = false; |
9553111d | 8358 | specs->non_sc_seen_p = true; |
1576dec7 | 8359 | specs->declspecs_seen_p = true; |
9553111d | 8360 | gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE |
8361 | && C_IS_RESERVED_WORD (qual)); | |
8362 | i = C_RID_CODE (qual); | |
bb476216 | 8363 | switch (i) |
8364 | { | |
8365 | case RID_CONST: | |
8366 | dupe = specs->const_p; | |
8367 | specs->const_p = true; | |
8368 | break; | |
8369 | case RID_VOLATILE: | |
8370 | dupe = specs->volatile_p; | |
8371 | specs->volatile_p = true; | |
8372 | break; | |
8373 | case RID_RESTRICT: | |
8374 | dupe = specs->restrict_p; | |
8375 | specs->restrict_p = true; | |
8376 | break; | |
8377 | default: | |
8378 | gcc_unreachable (); | |
8379 | } | |
8864917d | 8380 | if (dupe && !flag_isoc99) |
21ca8540 | 8381 | pedwarn (input_location, OPT_pedantic, "duplicate %qE", qual); |
9553111d | 8382 | return specs; |
8383 | } | |
8384 | ||
8385 | /* Add the type specifier TYPE to the declaration specifiers SPECS, | |
8386 | returning SPECS. */ | |
8387 | ||
8388 | struct c_declspecs * | |
843bd2fa | 8389 | declspecs_add_type (location_t loc, struct c_declspecs *specs, |
8390 | struct c_typespec spec) | |
9553111d | 8391 | { |
19702c1d | 8392 | tree type = spec.spec; |
9553111d | 8393 | specs->non_sc_seen_p = true; |
1576dec7 | 8394 | specs->declspecs_seen_p = true; |
8395 | specs->type_seen_p = true; | |
9553111d | 8396 | if (TREE_DEPRECATED (type)) |
8397 | specs->deprecated_p = true; | |
9553111d | 8398 | |
70dd11f7 | 8399 | /* Handle type specifier keywords. */ |
5c6e5756 | 8400 | if (TREE_CODE (type) == IDENTIFIER_NODE |
8401 | && C_IS_RESERVED_WORD (type) | |
8402 | && C_RID_CODE (type) != RID_CXX_COMPAT_WARN) | |
9553111d | 8403 | { |
8404 | enum rid i = C_RID_CODE (type); | |
70dd11f7 | 8405 | if (specs->type) |
8406 | { | |
843bd2fa | 8407 | error_at (loc, "two or more data types in declaration specifiers"); |
70dd11f7 | 8408 | return specs; |
8409 | } | |
9553111d | 8410 | if ((int) i <= (int) RID_LAST_MODIFIER) |
8411 | { | |
9421ebb9 | 8412 | /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */ |
70dd11f7 | 8413 | bool dupe = false; |
8414 | switch (i) | |
9553111d | 8415 | { |
70dd11f7 | 8416 | case RID_LONG: |
9553111d | 8417 | if (specs->long_long_p) |
9553111d | 8418 | { |
843bd2fa | 8419 | error_at (loc, "%<long long long%> is too long for GCC"); |
70dd11f7 | 8420 | break; |
8421 | } | |
8422 | if (specs->long_p) | |
8423 | { | |
8424 | if (specs->typespec_word == cts_double) | |
8425 | { | |
843bd2fa | 8426 | error_at (loc, |
8427 | ("both %<long long%> and %<double%> in " | |
8428 | "declaration specifiers")); | |
70dd11f7 | 8429 | break; |
8430 | } | |
843bd2fa | 8431 | pedwarn_c90 (loc, OPT_Wlong_long, |
9ab71c6b | 8432 | "ISO C90 does not support %<long long%>"); |
9553111d | 8433 | specs->long_long_p = 1; |
70dd11f7 | 8434 | break; |
9553111d | 8435 | } |
70dd11f7 | 8436 | if (specs->short_p) |
843bd2fa | 8437 | error_at (loc, |
8438 | ("both %<long%> and %<short%> in " | |
8439 | "declaration specifiers")); | |
70dd11f7 | 8440 | else if (specs->typespec_word == cts_void) |
843bd2fa | 8441 | error_at (loc, |
8442 | ("both %<long%> and %<void%> in " | |
8443 | "declaration specifiers")); | |
70dd11f7 | 8444 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 8445 | error_at (loc, |
8446 | ("both %<long%> and %<_Bool%> in " | |
8447 | "declaration specifiers")); | |
70dd11f7 | 8448 | else if (specs->typespec_word == cts_char) |
843bd2fa | 8449 | error_at (loc, |
8450 | ("both %<long%> and %<char%> in " | |
8451 | "declaration specifiers")); | |
70dd11f7 | 8452 | else if (specs->typespec_word == cts_float) |
843bd2fa | 8453 | error_at (loc, |
8454 | ("both %<long%> and %<float%> in " | |
8455 | "declaration specifiers")); | |
c4503c0a | 8456 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 8457 | error_at (loc, |
8458 | ("both %<long%> and %<_Decimal32%> in " | |
8459 | "declaration specifiers")); | |
c4503c0a | 8460 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 8461 | error_at (loc, |
8462 | ("both %<long%> and %<_Decimal64%> in " | |
8463 | "declaration specifiers")); | |
c4503c0a | 8464 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 8465 | error_at (loc, |
8466 | ("both %<long%> and %<_Decimal128%> in " | |
8467 | "declaration specifiers")); | |
70dd11f7 | 8468 | else |
8469 | specs->long_p = true; | |
8470 | break; | |
8471 | case RID_SHORT: | |
8472 | dupe = specs->short_p; | |
8473 | if (specs->long_p) | |
843bd2fa | 8474 | error_at (loc, |
8475 | ("both %<long%> and %<short%> in " | |
8476 | "declaration specifiers")); | |
70dd11f7 | 8477 | else if (specs->typespec_word == cts_void) |
843bd2fa | 8478 | error_at (loc, |
8479 | ("both %<short%> and %<void%> in " | |
8480 | "declaration specifiers")); | |
70dd11f7 | 8481 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 8482 | error_at (loc, |
8483 | ("both %<short%> and %<_Bool%> in " | |
8484 | "declaration specifiers")); | |
70dd11f7 | 8485 | else if (specs->typespec_word == cts_char) |
843bd2fa | 8486 | error_at (loc, |
8487 | ("both %<short%> and %<char%> in " | |
8488 | "declaration specifiers")); | |
70dd11f7 | 8489 | else if (specs->typespec_word == cts_float) |
843bd2fa | 8490 | error_at (loc, |
8491 | ("both %<short%> and %<float%> in " | |
8492 | "declaration specifiers")); | |
70dd11f7 | 8493 | else if (specs->typespec_word == cts_double) |
843bd2fa | 8494 | error_at (loc, |
8495 | ("both %<short%> and %<double%> in " | |
8496 | "declaration specifiers")); | |
c4503c0a | 8497 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 8498 | error_at (loc, |
8499 | ("both %<short%> and %<_Decimal32%> in " | |
8500 | "declaration specifiers")); | |
c4503c0a | 8501 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 8502 | error_at (loc, |
8503 | ("both %<short%> and %<_Decimal64%> in " | |
8504 | "declaration specifiers")); | |
c4503c0a | 8505 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 8506 | error_at (loc, |
8507 | ("both %<short%> and %<_Decimal128%> in " | |
8508 | "declaration specifiers")); | |
70dd11f7 | 8509 | else |
8510 | specs->short_p = true; | |
8511 | break; | |
8512 | case RID_SIGNED: | |
8513 | dupe = specs->signed_p; | |
8514 | if (specs->unsigned_p) | |
843bd2fa | 8515 | error_at (loc, |
8516 | ("both %<signed%> and %<unsigned%> in " | |
8517 | "declaration specifiers")); | |
70dd11f7 | 8518 | else if (specs->typespec_word == cts_void) |
843bd2fa | 8519 | error_at (loc, |
8520 | ("both %<signed%> and %<void%> in " | |
8521 | "declaration specifiers")); | |
70dd11f7 | 8522 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 8523 | error_at (loc, |
8524 | ("both %<signed%> and %<_Bool%> in " | |
8525 | "declaration specifiers")); | |
70dd11f7 | 8526 | else if (specs->typespec_word == cts_float) |
843bd2fa | 8527 | error_at (loc, |
8528 | ("both %<signed%> and %<float%> in " | |
8529 | "declaration specifiers")); | |
70dd11f7 | 8530 | else if (specs->typespec_word == cts_double) |
843bd2fa | 8531 | error_at (loc, |
8532 | ("both %<signed%> and %<double%> in " | |
8533 | "declaration specifiers")); | |
c4503c0a | 8534 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 8535 | error_at (loc, |
8536 | ("both %<signed%> and %<_Decimal32%> in " | |
8537 | "declaration specifiers")); | |
c4503c0a | 8538 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 8539 | error_at (loc, |
8540 | ("both %<signed%> and %<_Decimal64%> in " | |
8541 | "declaration specifiers")); | |
c4503c0a | 8542 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 8543 | error_at (loc, |
8544 | ("both %<signed%> and %<_Decimal128%> in " | |
8545 | "declaration specifiers")); | |
70dd11f7 | 8546 | else |
8547 | specs->signed_p = true; | |
8548 | break; | |
8549 | case RID_UNSIGNED: | |
8550 | dupe = specs->unsigned_p; | |
8551 | if (specs->signed_p) | |
843bd2fa | 8552 | error_at (loc, |
8553 | ("both %<signed%> and %<unsigned%> in " | |
8554 | "declaration specifiers")); | |
70dd11f7 | 8555 | else if (specs->typespec_word == cts_void) |
843bd2fa | 8556 | error_at (loc, |
8557 | ("both %<unsigned%> and %<void%> in " | |
8558 | "declaration specifiers")); | |
70dd11f7 | 8559 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 8560 | error_at (loc, |
8561 | ("both %<unsigned%> and %<_Bool%> in " | |
8562 | "declaration specifiers")); | |
70dd11f7 | 8563 | else if (specs->typespec_word == cts_float) |
843bd2fa | 8564 | error_at (loc, |
8565 | ("both %<unsigned%> and %<float%> in " | |
8566 | "declaration specifiers")); | |
70dd11f7 | 8567 | else if (specs->typespec_word == cts_double) |
843bd2fa | 8568 | error_at (loc, |
8569 | ("both %<unsigned%> and %<double%> in " | |
8570 | "declaration specifiers")); | |
c4503c0a | 8571 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 8572 | error_at (loc, |
8573 | ("both %<unsigned%> and %<_Decimal32%> in " | |
8574 | "declaration specifiers")); | |
c4503c0a | 8575 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 8576 | error_at (loc, |
8577 | ("both %<unsigned%> and %<_Decimal64%> in " | |
8578 | "declaration specifiers")); | |
c4503c0a | 8579 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 8580 | error_at (loc, |
8581 | ("both %<unsigned%> and %<_Decimal128%> in " | |
8582 | "declaration specifiers")); | |
70dd11f7 | 8583 | else |
8584 | specs->unsigned_p = true; | |
8585 | break; | |
8586 | case RID_COMPLEX: | |
8587 | dupe = specs->complex_p; | |
8864917d | 8588 | if (!flag_isoc99 && !in_system_header) |
843bd2fa | 8589 | pedwarn (loc, OPT_pedantic, |
8590 | "ISO C90 does not support complex types"); | |
70dd11f7 | 8591 | if (specs->typespec_word == cts_void) |
843bd2fa | 8592 | error_at (loc, |
8593 | ("both %<complex%> and %<void%> in " | |
8594 | "declaration specifiers")); | |
70dd11f7 | 8595 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 8596 | error_at (loc, |
8597 | ("both %<complex%> and %<_Bool%> in " | |
8598 | "declaration specifiers")); | |
c4503c0a | 8599 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 8600 | error_at (loc, |
8601 | ("both %<complex%> and %<_Decimal32%> in " | |
8602 | "declaration specifiers")); | |
c4503c0a | 8603 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 8604 | error_at (loc, |
8605 | ("both %<complex%> and %<_Decimal64%> in " | |
8606 | "declaration specifiers")); | |
c4503c0a | 8607 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 8608 | error_at (loc, |
8609 | ("both %<complex%> and %<_Decimal128%> in " | |
8610 | "declaration specifiers")); | |
9421ebb9 | 8611 | else if (specs->typespec_word == cts_fract) |
843bd2fa | 8612 | error_at (loc, |
8613 | ("both %<complex%> and %<_Fract%> in " | |
8614 | "declaration specifiers")); | |
9421ebb9 | 8615 | else if (specs->typespec_word == cts_accum) |
843bd2fa | 8616 | error_at (loc, |
8617 | ("both %<complex%> and %<_Accum%> in " | |
8618 | "declaration specifiers")); | |
9421ebb9 | 8619 | else if (specs->saturating_p) |
843bd2fa | 8620 | error_at (loc, |
8621 | ("both %<complex%> and %<_Sat%> in " | |
8622 | "declaration specifiers")); | |
70dd11f7 | 8623 | else |
8624 | specs->complex_p = true; | |
8625 | break; | |
9421ebb9 | 8626 | case RID_SAT: |
8627 | dupe = specs->saturating_p; | |
843bd2fa | 8628 | pedwarn (loc, OPT_pedantic, |
8629 | "ISO C does not support saturating types"); | |
9421ebb9 | 8630 | if (specs->typespec_word == cts_void) |
843bd2fa | 8631 | error_at (loc, |
8632 | ("both %<_Sat%> and %<void%> in " | |
8633 | "declaration specifiers")); | |
9421ebb9 | 8634 | else if (specs->typespec_word == cts_bool) |
843bd2fa | 8635 | error_at (loc, |
8636 | ("both %<_Sat%> and %<_Bool%> in " | |
8637 | "declaration specifiers")); | |
9421ebb9 | 8638 | else if (specs->typespec_word == cts_char) |
843bd2fa | 8639 | error_at (loc, |
8640 | ("both %<_Sat%> and %<char%> in " | |
8641 | "declaration specifiers")); | |
9421ebb9 | 8642 | else if (specs->typespec_word == cts_int) |
843bd2fa | 8643 | error_at (loc, |
8644 | ("both %<_Sat%> and %<int%> in " | |
8645 | "declaration specifiers")); | |
9421ebb9 | 8646 | else if (specs->typespec_word == cts_float) |
843bd2fa | 8647 | error_at (loc, |
8648 | ("both %<_Sat%> and %<float%> in " | |
8649 | "declaration specifiers")); | |
9421ebb9 | 8650 | else if (specs->typespec_word == cts_double) |
843bd2fa | 8651 | error_at (loc, |
8652 | ("both %<_Sat%> and %<double%> in " | |
8653 | "declaration specifiers")); | |
9421ebb9 | 8654 | else if (specs->typespec_word == cts_dfloat32) |
843bd2fa | 8655 | error_at (loc, |
8656 | ("both %<_Sat%> and %<_Decimal32%> in " | |
8657 | "declaration specifiers")); | |
9421ebb9 | 8658 | else if (specs->typespec_word == cts_dfloat64) |
843bd2fa | 8659 | error_at (loc, |
8660 | ("both %<_Sat%> and %<_Decimal64%> in " | |
8661 | "declaration specifiers")); | |
9421ebb9 | 8662 | else if (specs->typespec_word == cts_dfloat128) |
843bd2fa | 8663 | error_at (loc, |
8664 | ("both %<_Sat%> and %<_Decimal128%> in " | |
8665 | "declaration specifiers")); | |
9421ebb9 | 8666 | else if (specs->complex_p) |
843bd2fa | 8667 | error_at (loc, |
8668 | ("both %<_Sat%> and %<complex%> in " | |
8669 | "declaration specifiers")); | |
9421ebb9 | 8670 | else |
8671 | specs->saturating_p = true; | |
8672 | break; | |
70dd11f7 | 8673 | default: |
8674 | gcc_unreachable (); | |
9553111d | 8675 | } |
70dd11f7 | 8676 | |
8677 | if (dupe) | |
843bd2fa | 8678 | error_at (loc, "duplicate %qE", type); |
9553111d | 8679 | |
9553111d | 8680 | return specs; |
8681 | } | |
70dd11f7 | 8682 | else |
8683 | { | |
9421ebb9 | 8684 | /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32", |
8685 | "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */ | |
70dd11f7 | 8686 | if (specs->typespec_word != cts_none) |
8687 | { | |
843bd2fa | 8688 | error_at (loc, |
8689 | "two or more data types in declaration specifiers"); | |
70dd11f7 | 8690 | return specs; |
8691 | } | |
8692 | switch (i) | |
8693 | { | |
8694 | case RID_VOID: | |
8695 | if (specs->long_p) | |
843bd2fa | 8696 | error_at (loc, |
8697 | ("both %<long%> and %<void%> in " | |
8698 | "declaration specifiers")); | |
70dd11f7 | 8699 | else if (specs->short_p) |
843bd2fa | 8700 | error_at (loc, |
8701 | ("both %<short%> and %<void%> in " | |
8702 | "declaration specifiers")); | |
70dd11f7 | 8703 | else if (specs->signed_p) |
843bd2fa | 8704 | error_at (loc, |
8705 | ("both %<signed%> and %<void%> in " | |
8706 | "declaration specifiers")); | |
70dd11f7 | 8707 | else if (specs->unsigned_p) |
843bd2fa | 8708 | error_at (loc, |
8709 | ("both %<unsigned%> and %<void%> in " | |
8710 | "declaration specifiers")); | |
70dd11f7 | 8711 | else if (specs->complex_p) |
843bd2fa | 8712 | error_at (loc, |
8713 | ("both %<complex%> and %<void%> in " | |
8714 | "declaration specifiers")); | |
9421ebb9 | 8715 | else if (specs->saturating_p) |
843bd2fa | 8716 | error_at (loc, |
8717 | ("both %<_Sat%> and %<void%> in " | |
8718 | "declaration specifiers")); | |
70dd11f7 | 8719 | else |
8720 | specs->typespec_word = cts_void; | |
8721 | return specs; | |
8722 | case RID_BOOL: | |
8723 | if (specs->long_p) | |
843bd2fa | 8724 | error_at (loc, |
8725 | ("both %<long%> and %<_Bool%> in " | |
8726 | "declaration specifiers")); | |
70dd11f7 | 8727 | else if (specs->short_p) |
843bd2fa | 8728 | error_at (loc, |
8729 | ("both %<short%> and %<_Bool%> in " | |
8730 | "declaration specifiers")); | |
70dd11f7 | 8731 | else if (specs->signed_p) |
843bd2fa | 8732 | error_at (loc, |
8733 | ("both %<signed%> and %<_Bool%> in " | |
8734 | "declaration specifiers")); | |
70dd11f7 | 8735 | else if (specs->unsigned_p) |
843bd2fa | 8736 | error_at (loc, |
8737 | ("both %<unsigned%> and %<_Bool%> in " | |
8738 | "declaration specifiers")); | |
70dd11f7 | 8739 | else if (specs->complex_p) |
843bd2fa | 8740 | error_at (loc, |
8741 | ("both %<complex%> and %<_Bool%> in " | |
8742 | "declaration specifiers")); | |
9421ebb9 | 8743 | else if (specs->saturating_p) |
843bd2fa | 8744 | error_at (loc, |
8745 | ("both %<_Sat%> and %<_Bool%> in " | |
8746 | "declaration specifiers")); | |
70dd11f7 | 8747 | else |
8748 | specs->typespec_word = cts_bool; | |
8749 | return specs; | |
8750 | case RID_CHAR: | |
8751 | if (specs->long_p) | |
843bd2fa | 8752 | error_at (loc, |
8753 | ("both %<long%> and %<char%> in " | |
8754 | "declaration specifiers")); | |
70dd11f7 | 8755 | else if (specs->short_p) |
843bd2fa | 8756 | error_at (loc, |
8757 | ("both %<short%> and %<char%> in " | |
8758 | "declaration specifiers")); | |
9421ebb9 | 8759 | else if (specs->saturating_p) |
843bd2fa | 8760 | error_at (loc, |
8761 | ("both %<_Sat%> and %<char%> in " | |
8762 | "declaration specifiers")); | |
70dd11f7 | 8763 | else |
8764 | specs->typespec_word = cts_char; | |
8765 | return specs; | |
8766 | case RID_INT: | |
9421ebb9 | 8767 | if (specs->saturating_p) |
843bd2fa | 8768 | error_at (loc, |
8769 | ("both %<_Sat%> and %<int%> in " | |
8770 | "declaration specifiers")); | |
9421ebb9 | 8771 | else |
8772 | specs->typespec_word = cts_int; | |
70dd11f7 | 8773 | return specs; |
8774 | case RID_FLOAT: | |
8775 | if (specs->long_p) | |
843bd2fa | 8776 | error_at (loc, |
8777 | ("both %<long%> and %<float%> in " | |
8778 | "declaration specifiers")); | |
70dd11f7 | 8779 | else if (specs->short_p) |
843bd2fa | 8780 | error_at (loc, |
8781 | ("both %<short%> and %<float%> in " | |
8782 | "declaration specifiers")); | |
70dd11f7 | 8783 | else if (specs->signed_p) |
843bd2fa | 8784 | error_at (loc, |
8785 | ("both %<signed%> and %<float%> in " | |
8786 | "declaration specifiers")); | |
70dd11f7 | 8787 | else if (specs->unsigned_p) |
843bd2fa | 8788 | error_at (loc, |
8789 | ("both %<unsigned%> and %<float%> in " | |
8790 | "declaration specifiers")); | |
9421ebb9 | 8791 | else if (specs->saturating_p) |
843bd2fa | 8792 | error_at (loc, |
8793 | ("both %<_Sat%> and %<float%> in " | |
8794 | "declaration specifiers")); | |
70dd11f7 | 8795 | else |
8796 | specs->typespec_word = cts_float; | |
8797 | return specs; | |
8798 | case RID_DOUBLE: | |
8799 | if (specs->long_long_p) | |
843bd2fa | 8800 | error_at (loc, |
8801 | ("both %<long long%> and %<double%> in " | |
8802 | "declaration specifiers")); | |
70dd11f7 | 8803 | else if (specs->short_p) |
843bd2fa | 8804 | error_at (loc, |
8805 | ("both %<short%> and %<double%> in " | |
8806 | "declaration specifiers")); | |
70dd11f7 | 8807 | else if (specs->signed_p) |
843bd2fa | 8808 | error_at (loc, |
8809 | ("both %<signed%> and %<double%> in " | |
8810 | "declaration specifiers")); | |
70dd11f7 | 8811 | else if (specs->unsigned_p) |
843bd2fa | 8812 | error_at (loc, |
8813 | ("both %<unsigned%> and %<double%> in " | |
8814 | "declaration specifiers")); | |
9421ebb9 | 8815 | else if (specs->saturating_p) |
843bd2fa | 8816 | error_at (loc, |
8817 | ("both %<_Sat%> and %<double%> in " | |
8818 | "declaration specifiers")); | |
70dd11f7 | 8819 | else |
8820 | specs->typespec_word = cts_double; | |
8821 | return specs; | |
c4503c0a | 8822 | case RID_DFLOAT32: |
8823 | case RID_DFLOAT64: | |
8824 | case RID_DFLOAT128: | |
8825 | { | |
8826 | const char *str; | |
8827 | if (i == RID_DFLOAT32) | |
8828 | str = "_Decimal32"; | |
8829 | else if (i == RID_DFLOAT64) | |
8830 | str = "_Decimal64"; | |
8831 | else | |
8832 | str = "_Decimal128"; | |
8833 | if (specs->long_long_p) | |
843bd2fa | 8834 | error_at (loc, |
8835 | ("both %<long long%> and %<%s%> in " | |
8836 | "declaration specifiers"), | |
8837 | str); | |
c4503c0a | 8838 | if (specs->long_p) |
843bd2fa | 8839 | error_at (loc, |
8840 | ("both %<long%> and %<%s%> in " | |
8841 | "declaration specifiers"), | |
8842 | str); | |
c4503c0a | 8843 | else if (specs->short_p) |
843bd2fa | 8844 | error_at (loc, |
8845 | ("both %<short%> and %<%s%> in " | |
8846 | "declaration specifiers"), | |
8847 | str); | |
c4503c0a | 8848 | else if (specs->signed_p) |
843bd2fa | 8849 | error_at (loc, |
8850 | ("both %<signed%> and %<%s%> in " | |
8851 | "declaration specifiers"), | |
8852 | str); | |
c4503c0a | 8853 | else if (specs->unsigned_p) |
843bd2fa | 8854 | error_at (loc, |
8855 | ("both %<unsigned%> and %<%s%> in " | |
8856 | "declaration specifiers"), | |
8857 | str); | |
c4503c0a | 8858 | else if (specs->complex_p) |
843bd2fa | 8859 | error_at (loc, |
8860 | ("both %<complex%> and %<%s%> in " | |
8861 | "declaration specifiers"), | |
8862 | str); | |
9421ebb9 | 8863 | else if (specs->saturating_p) |
843bd2fa | 8864 | error_at (loc, |
8865 | ("both %<_Sat%> and %<%s%> in " | |
8866 | "declaration specifiers"), | |
8867 | str); | |
c4503c0a | 8868 | else if (i == RID_DFLOAT32) |
8869 | specs->typespec_word = cts_dfloat32; | |
8870 | else if (i == RID_DFLOAT64) | |
8871 | specs->typespec_word = cts_dfloat64; | |
8872 | else | |
8873 | specs->typespec_word = cts_dfloat128; | |
8874 | } | |
8875 | if (!targetm.decimal_float_supported_p ()) | |
843bd2fa | 8876 | error_at (loc, |
8877 | ("decimal floating point not supported " | |
8878 | "for this target")); | |
8879 | pedwarn (loc, OPT_pedantic, | |
8864917d | 8880 | "ISO C does not support decimal floating point"); |
c4503c0a | 8881 | return specs; |
9421ebb9 | 8882 | case RID_FRACT: |
8883 | case RID_ACCUM: | |
8884 | { | |
8885 | const char *str; | |
8886 | if (i == RID_FRACT) | |
8887 | str = "_Fract"; | |
8888 | else | |
8889 | str = "_Accum"; | |
8890 | if (specs->complex_p) | |
843bd2fa | 8891 | error_at (loc, |
8892 | ("both %<complex%> and %<%s%> in " | |
8893 | "declaration specifiers"), | |
8894 | str); | |
9421ebb9 | 8895 | else if (i == RID_FRACT) |
8896 | specs->typespec_word = cts_fract; | |
8897 | else | |
8898 | specs->typespec_word = cts_accum; | |
8899 | } | |
8900 | if (!targetm.fixed_point_supported_p ()) | |
843bd2fa | 8901 | error_at (loc, |
8902 | "fixed-point types not supported for this target"); | |
8903 | pedwarn (loc, OPT_pedantic, | |
8864917d | 8904 | "ISO C does not support fixed-point types"); |
9421ebb9 | 8905 | return specs; |
70dd11f7 | 8906 | default: |
8907 | /* ObjC reserved word "id", handled below. */ | |
8908 | break; | |
8909 | } | |
8910 | } | |
9553111d | 8911 | } |
70dd11f7 | 8912 | |
8913 | /* Now we have a typedef (a TYPE_DECL node), an identifier (some | |
8914 | form of ObjC type, cases such as "int" and "long" being handled | |
8915 | above), a TYPE (struct, union, enum and typeof specifiers) or an | |
8916 | ERROR_MARK. In none of these cases may there have previously | |
8917 | been any type specifiers. */ | |
8918 | if (specs->type || specs->typespec_word != cts_none | |
8919 | || specs->long_p || specs->short_p || specs->signed_p | |
8920 | || specs->unsigned_p || specs->complex_p) | |
843bd2fa | 8921 | error_at (loc, "two or more data types in declaration specifiers"); |
9553111d | 8922 | else if (TREE_CODE (type) == TYPE_DECL) |
8923 | { | |
8924 | if (TREE_TYPE (type) == error_mark_node) | |
8925 | ; /* Allow the type to default to int to avoid cascading errors. */ | |
8926 | else | |
8927 | { | |
8928 | specs->type = TREE_TYPE (type); | |
8929 | specs->decl_attr = DECL_ATTRIBUTES (type); | |
490eec42 | 8930 | specs->typedef_p = true; |
70dd11f7 | 8931 | specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type); |
843bd2fa | 8932 | |
8933 | /* If this typedef name is defined in a struct, then a C++ | |
8934 | lookup would return a different value. */ | |
8935 | if (warn_cxx_compat | |
8936 | && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct) | |
8937 | warning_at (loc, OPT_Wc___compat, | |
8938 | "C++ lookup of %qD would return a field, not a type", | |
8939 | type); | |
8940 | ||
8941 | /* If we are parsing a struct, record that a struct field | |
8942 | used a typedef. */ | |
8943 | if (warn_cxx_compat && struct_parse_info != NULL) | |
8944 | VEC_safe_push (tree, heap, struct_parse_info->typedefs_seen, type); | |
9553111d | 8945 | } |
8946 | } | |
9553111d | 8947 | else if (TREE_CODE (type) == IDENTIFIER_NODE) |
8948 | { | |
8949 | tree t = lookup_name (type); | |
8950 | if (!t || TREE_CODE (t) != TYPE_DECL) | |
843bd2fa | 8951 | error_at (loc, "%qE fails to be a typedef or built in type", type); |
9553111d | 8952 | else if (TREE_TYPE (t) == error_mark_node) |
8953 | ; | |
8954 | else | |
8955 | specs->type = TREE_TYPE (t); | |
8956 | } | |
8957 | else if (TREE_CODE (type) != ERROR_MARK) | |
19702c1d | 8958 | { |
8959 | if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref) | |
8960 | specs->tag_defined_p = true; | |
8961 | if (spec.kind == ctsk_typeof) | |
a75b1c71 | 8962 | { |
8963 | specs->typedef_p = true; | |
8964 | if (spec.expr) | |
8965 | { | |
8966 | if (specs->expr) | |
8967 | specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr), | |
8968 | specs->expr, spec.expr); | |
8969 | else | |
8970 | specs->expr = spec.expr; | |
8971 | specs->expr_const_operands &= spec.expr_const_operands; | |
8972 | } | |
8973 | } | |
19702c1d | 8974 | specs->type = type; |
8975 | } | |
9553111d | 8976 | |
8977 | return specs; | |
8978 | } | |
8979 | ||
8980 | /* Add the storage class specifier or function specifier SCSPEC to the | |
8981 | declaration specifiers SPECS, returning SPECS. */ | |
8982 | ||
8983 | struct c_declspecs * | |
8984 | declspecs_add_scspec (struct c_declspecs *specs, tree scspec) | |
8985 | { | |
8986 | enum rid i; | |
feb04535 | 8987 | enum c_storage_class n = csc_none; |
8988 | bool dupe = false; | |
1576dec7 | 8989 | specs->declspecs_seen_p = true; |
9553111d | 8990 | gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE |
8991 | && C_IS_RESERVED_WORD (scspec)); | |
8992 | i = C_RID_CODE (scspec); | |
02619052 | 8993 | if (specs->non_sc_seen_p) |
8994 | warning (OPT_Wold_style_declaration, | |
8995 | "%qE is not at beginning of declaration", scspec); | |
feb04535 | 8996 | switch (i) |
8997 | { | |
8998 | case RID_INLINE: | |
ebdbd341 | 8999 | /* C99 permits duplicate inline. Although of doubtful utility, |
9000 | it seems simplest to permit it in gnu89 mode as well, as | |
9001 | there is also little utility in maintaining this as a | |
9002 | difference between gnu89 and C99 inline. */ | |
9003 | dupe = false; | |
feb04535 | 9004 | specs->inline_p = true; |
9005 | break; | |
9006 | case RID_THREAD: | |
9007 | dupe = specs->thread_p; | |
9008 | if (specs->storage_class == csc_auto) | |
9009 | error ("%<__thread%> used with %<auto%>"); | |
9010 | else if (specs->storage_class == csc_register) | |
9011 | error ("%<__thread%> used with %<register%>"); | |
9012 | else if (specs->storage_class == csc_typedef) | |
9013 | error ("%<__thread%> used with %<typedef%>"); | |
9014 | else | |
9015 | specs->thread_p = true; | |
9016 | break; | |
9017 | case RID_AUTO: | |
9018 | n = csc_auto; | |
9019 | break; | |
9020 | case RID_EXTERN: | |
9021 | n = csc_extern; | |
9022 | /* Diagnose "__thread extern". */ | |
9023 | if (specs->thread_p) | |
9553111d | 9024 | error ("%<__thread%> before %<extern%>"); |
feb04535 | 9025 | break; |
9026 | case RID_REGISTER: | |
9027 | n = csc_register; | |
9028 | break; | |
9029 | case RID_STATIC: | |
9030 | n = csc_static; | |
9031 | /* Diagnose "__thread static". */ | |
9032 | if (specs->thread_p) | |
9553111d | 9033 | error ("%<__thread%> before %<static%>"); |
feb04535 | 9034 | break; |
9035 | case RID_TYPEDEF: | |
9036 | n = csc_typedef; | |
9037 | break; | |
9038 | default: | |
9039 | gcc_unreachable (); | |
9040 | } | |
9041 | if (n != csc_none && n == specs->storage_class) | |
9042 | dupe = true; | |
9043 | if (dupe) | |
782858b8 | 9044 | error ("duplicate %qE", scspec); |
feb04535 | 9045 | if (n != csc_none) |
9046 | { | |
9047 | if (specs->storage_class != csc_none && n != specs->storage_class) | |
9048 | { | |
9049 | error ("multiple storage classes in declaration specifiers"); | |
9050 | } | |
9051 | else | |
9052 | { | |
9053 | specs->storage_class = n; | |
9054 | if (n != csc_extern && n != csc_static && specs->thread_p) | |
9055 | { | |
782858b8 | 9056 | error ("%<__thread%> used with %qE", scspec); |
feb04535 | 9057 | specs->thread_p = false; |
9058 | } | |
9059 | } | |
9553111d | 9060 | } |
9553111d | 9061 | return specs; |
9062 | } | |
9063 | ||
9064 | /* Add the attributes ATTRS to the declaration specifiers SPECS, | |
9065 | returning SPECS. */ | |
9066 | ||
9067 | struct c_declspecs * | |
9068 | declspecs_add_attrs (struct c_declspecs *specs, tree attrs) | |
9069 | { | |
9070 | specs->attrs = chainon (attrs, specs->attrs); | |
1576dec7 | 9071 | specs->declspecs_seen_p = true; |
9553111d | 9072 | return specs; |
9073 | } | |
9074 | ||
70dd11f7 | 9075 | /* Combine "long", "short", "signed", "unsigned" and "_Complex" type |
9076 | specifiers with any other type specifier to determine the resulting | |
9077 | type. This is where ISO C checks on complex types are made, since | |
9078 | "_Complex long" is a prefix of the valid ISO C type "_Complex long | |
9079 | double". */ | |
9080 | ||
9081 | struct c_declspecs * | |
9082 | finish_declspecs (struct c_declspecs *specs) | |
9083 | { | |
9084 | /* If a type was specified as a whole, we have no modifiers and are | |
9085 | done. */ | |
9086 | if (specs->type != NULL_TREE) | |
9087 | { | |
9088 | gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p | |
9089 | && !specs->signed_p && !specs->unsigned_p | |
9090 | && !specs->complex_p); | |
9091 | return specs; | |
9092 | } | |
9093 | ||
9094 | /* If none of "void", "_Bool", "char", "int", "float" or "double" | |
9095 | has been specified, treat it as "int" unless "_Complex" is | |
9096 | present and there are no other specifiers. If we just have | |
9097 | "_Complex", it is equivalent to "_Complex double", but e.g. | |
9098 | "_Complex short" is equivalent to "_Complex short int". */ | |
9099 | if (specs->typespec_word == cts_none) | |
9100 | { | |
9421ebb9 | 9101 | if (specs->saturating_p) |
84786a68 | 9102 | { |
9103 | error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>"); | |
14e882ea | 9104 | if (!targetm.fixed_point_supported_p ()) |
9105 | error ("fixed-point types not supported for this target"); | |
84786a68 | 9106 | specs->typespec_word = cts_fract; |
9107 | } | |
9108 | else if (specs->long_p || specs->short_p | |
9109 | || specs->signed_p || specs->unsigned_p) | |
70dd11f7 | 9110 | { |
9111 | specs->typespec_word = cts_int; | |
9112 | } | |
9113 | else if (specs->complex_p) | |
9114 | { | |
9115 | specs->typespec_word = cts_double; | |
21ca8540 | 9116 | pedwarn (input_location, OPT_pedantic, |
8864917d | 9117 | "ISO C does not support plain %<complex%> meaning " |
9118 | "%<double complex%>"); | |
70dd11f7 | 9119 | } |
9120 | else | |
9121 | { | |
9122 | specs->typespec_word = cts_int; | |
9123 | specs->default_int_p = true; | |
9124 | /* We don't diagnose this here because grokdeclarator will | |
9125 | give more specific diagnostics according to whether it is | |
9126 | a function definition. */ | |
9127 | } | |
9128 | } | |
9129 | ||
9130 | /* If "signed" was specified, record this to distinguish "int" and | |
9131 | "signed int" in the case of a bit-field with | |
9132 | -funsigned-bitfields. */ | |
9133 | specs->explicit_signed_p = specs->signed_p; | |
9134 | ||
9135 | /* Now compute the actual type. */ | |
9136 | switch (specs->typespec_word) | |
9137 | { | |
9138 | case cts_void: | |
9139 | gcc_assert (!specs->long_p && !specs->short_p | |
9140 | && !specs->signed_p && !specs->unsigned_p | |
9141 | && !specs->complex_p); | |
9142 | specs->type = void_type_node; | |
9143 | break; | |
9144 | case cts_bool: | |
9145 | gcc_assert (!specs->long_p && !specs->short_p | |
9146 | && !specs->signed_p && !specs->unsigned_p | |
9147 | && !specs->complex_p); | |
9148 | specs->type = boolean_type_node; | |
9149 | break; | |
9150 | case cts_char: | |
9151 | gcc_assert (!specs->long_p && !specs->short_p); | |
9152 | gcc_assert (!(specs->signed_p && specs->unsigned_p)); | |
9153 | if (specs->signed_p) | |
9154 | specs->type = signed_char_type_node; | |
9155 | else if (specs->unsigned_p) | |
9156 | specs->type = unsigned_char_type_node; | |
9157 | else | |
9158 | specs->type = char_type_node; | |
9159 | if (specs->complex_p) | |
9160 | { | |
21ca8540 | 9161 | pedwarn (input_location, OPT_pedantic, |
8864917d | 9162 | "ISO C does not support complex integer types"); |
70dd11f7 | 9163 | specs->type = build_complex_type (specs->type); |
9164 | } | |
9165 | break; | |
9166 | case cts_int: | |
9167 | gcc_assert (!(specs->long_p && specs->short_p)); | |
9168 | gcc_assert (!(specs->signed_p && specs->unsigned_p)); | |
9169 | if (specs->long_long_p) | |
9170 | specs->type = (specs->unsigned_p | |
9171 | ? long_long_unsigned_type_node | |
9172 | : long_long_integer_type_node); | |
9173 | else if (specs->long_p) | |
9174 | specs->type = (specs->unsigned_p | |
9175 | ? long_unsigned_type_node | |
9176 | : long_integer_type_node); | |
9177 | else if (specs->short_p) | |
9178 | specs->type = (specs->unsigned_p | |
9179 | ? short_unsigned_type_node | |
9180 | : short_integer_type_node); | |
9181 | else | |
9182 | specs->type = (specs->unsigned_p | |
9183 | ? unsigned_type_node | |
9184 | : integer_type_node); | |
9185 | if (specs->complex_p) | |
9186 | { | |
21ca8540 | 9187 | pedwarn (input_location, OPT_pedantic, |
8864917d | 9188 | "ISO C does not support complex integer types"); |
70dd11f7 | 9189 | specs->type = build_complex_type (specs->type); |
9190 | } | |
9191 | break; | |
9192 | case cts_float: | |
9193 | gcc_assert (!specs->long_p && !specs->short_p | |
9194 | && !specs->signed_p && !specs->unsigned_p); | |
9195 | specs->type = (specs->complex_p | |
9196 | ? complex_float_type_node | |
9197 | : float_type_node); | |
9198 | break; | |
9199 | case cts_double: | |
9200 | gcc_assert (!specs->long_long_p && !specs->short_p | |
9201 | && !specs->signed_p && !specs->unsigned_p); | |
9202 | if (specs->long_p) | |
9203 | { | |
9204 | specs->type = (specs->complex_p | |
9205 | ? complex_long_double_type_node | |
9206 | : long_double_type_node); | |
9207 | } | |
9208 | else | |
9209 | { | |
9210 | specs->type = (specs->complex_p | |
9211 | ? complex_double_type_node | |
9212 | : double_type_node); | |
9213 | } | |
9214 | break; | |
c4503c0a | 9215 | case cts_dfloat32: |
9216 | case cts_dfloat64: | |
9217 | case cts_dfloat128: | |
9218 | gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p | |
9219 | && !specs->signed_p && !specs->unsigned_p && !specs->complex_p); | |
9220 | if (specs->typespec_word == cts_dfloat32) | |
9221 | specs->type = dfloat32_type_node; | |
9222 | else if (specs->typespec_word == cts_dfloat64) | |
9223 | specs->type = dfloat64_type_node; | |
9224 | else | |
9225 | specs->type = dfloat128_type_node; | |
9226 | break; | |
9421ebb9 | 9227 | case cts_fract: |
14e882ea | 9228 | gcc_assert (!specs->complex_p); |
9229 | if (!targetm.fixed_point_supported_p ()) | |
9230 | specs->type = integer_type_node; | |
9231 | else if (specs->saturating_p) | |
9421ebb9 | 9232 | { |
9233 | if (specs->long_long_p) | |
9234 | specs->type = specs->unsigned_p | |
9235 | ? sat_unsigned_long_long_fract_type_node | |
9236 | : sat_long_long_fract_type_node; | |
9237 | else if (specs->long_p) | |
9238 | specs->type = specs->unsigned_p | |
9239 | ? sat_unsigned_long_fract_type_node | |
9240 | : sat_long_fract_type_node; | |
9241 | else if (specs->short_p) | |
9242 | specs->type = specs->unsigned_p | |
9243 | ? sat_unsigned_short_fract_type_node | |
9244 | : sat_short_fract_type_node; | |
9245 | else | |
9246 | specs->type = specs->unsigned_p | |
9247 | ? sat_unsigned_fract_type_node | |
9248 | : sat_fract_type_node; | |
14e882ea | 9249 | } |
9421ebb9 | 9250 | else |
9251 | { | |
9252 | if (specs->long_long_p) | |
9253 | specs->type = specs->unsigned_p | |
9254 | ? unsigned_long_long_fract_type_node | |
9255 | : long_long_fract_type_node; | |
9256 | else if (specs->long_p) | |
9257 | specs->type = specs->unsigned_p | |
9258 | ? unsigned_long_fract_type_node | |
9259 | : long_fract_type_node; | |
9260 | else if (specs->short_p) | |
9261 | specs->type = specs->unsigned_p | |
9262 | ? unsigned_short_fract_type_node | |
9263 | : short_fract_type_node; | |
9264 | else | |
9265 | specs->type = specs->unsigned_p | |
9266 | ? unsigned_fract_type_node | |
9267 | : fract_type_node; | |
14e882ea | 9268 | } |
9421ebb9 | 9269 | break; |
9270 | case cts_accum: | |
14e882ea | 9271 | gcc_assert (!specs->complex_p); |
9272 | if (!targetm.fixed_point_supported_p ()) | |
9273 | specs->type = integer_type_node; | |
9274 | else if (specs->saturating_p) | |
9421ebb9 | 9275 | { |
9276 | if (specs->long_long_p) | |
9277 | specs->type = specs->unsigned_p | |
9278 | ? sat_unsigned_long_long_accum_type_node | |
9279 | : sat_long_long_accum_type_node; | |
9280 | else if (specs->long_p) | |
9281 | specs->type = specs->unsigned_p | |
9282 | ? sat_unsigned_long_accum_type_node | |
9283 | : sat_long_accum_type_node; | |
9284 | else if (specs->short_p) | |
9285 | specs->type = specs->unsigned_p | |
9286 | ? sat_unsigned_short_accum_type_node | |
9287 | : sat_short_accum_type_node; | |
9288 | else | |
9289 | specs->type = specs->unsigned_p | |
9290 | ? sat_unsigned_accum_type_node | |
9291 | : sat_accum_type_node; | |
14e882ea | 9292 | } |
9421ebb9 | 9293 | else |
9294 | { | |
9295 | if (specs->long_long_p) | |
9296 | specs->type = specs->unsigned_p | |
9297 | ? unsigned_long_long_accum_type_node | |
9298 | : long_long_accum_type_node; | |
9299 | else if (specs->long_p) | |
9300 | specs->type = specs->unsigned_p | |
9301 | ? unsigned_long_accum_type_node | |
9302 | : long_accum_type_node; | |
9303 | else if (specs->short_p) | |
9304 | specs->type = specs->unsigned_p | |
9305 | ? unsigned_short_accum_type_node | |
9306 | : short_accum_type_node; | |
9307 | else | |
9308 | specs->type = specs->unsigned_p | |
9309 | ? unsigned_accum_type_node | |
9310 | : accum_type_node; | |
14e882ea | 9311 | } |
9421ebb9 | 9312 | break; |
70dd11f7 | 9313 | default: |
9314 | gcc_unreachable (); | |
9315 | } | |
9316 | ||
9317 | return specs; | |
9318 | } | |
9319 | ||
c131e678 | 9320 | /* A subroutine of c_write_global_declarations. Perform final processing |
9321 | on one file scope's declarations (or the external scope's declarations), | |
9322 | GLOBALS. */ | |
9323 | ||
393b349a | 9324 | static void |
9325 | c_write_global_declarations_1 (tree globals) | |
40109983 | 9326 | { |
40109983 | 9327 | tree decl; |
aac7998f | 9328 | bool reconsider; |
14338e9a | 9329 | |
393b349a | 9330 | /* Process the decls in the order they were written. */ |
c131e678 | 9331 | for (decl = globals; decl; decl = TREE_CHAIN (decl)) |
9823d3a9 | 9332 | { |
9823d3a9 | 9333 | /* Check for used but undefined static functions using the C |
9334 | standard's definition of "used", and set TREE_NO_WARNING so | |
9335 | that check_global_declarations doesn't repeat the check. */ | |
9336 | if (TREE_CODE (decl) == FUNCTION_DECL | |
9337 | && DECL_INITIAL (decl) == 0 | |
9338 | && DECL_EXTERNAL (decl) | |
9339 | && !TREE_PUBLIC (decl) | |
9340 | && C_DECL_USED (decl)) | |
9341 | { | |
21ca8540 | 9342 | pedwarn (input_location, 0, "%q+F used but never defined", decl); |
9823d3a9 | 9343 | TREE_NO_WARNING (decl) = 1; |
9344 | } | |
c131e678 | 9345 | |
9346 | wrapup_global_declaration_1 (decl); | |
9823d3a9 | 9347 | } |
aac7998f | 9348 | |
9349 | do | |
9350 | { | |
9351 | reconsider = false; | |
9352 | for (decl = globals; decl; decl = TREE_CHAIN (decl)) | |
9353 | reconsider |= wrapup_global_declaration_2 (decl); | |
9354 | } | |
9355 | while (reconsider); | |
9356 | ||
9357 | for (decl = globals; decl; decl = TREE_CHAIN (decl)) | |
9358 | check_global_declaration_1 (decl); | |
c131e678 | 9359 | } |
40109983 | 9360 | |
c131e678 | 9361 | /* A subroutine of c_write_global_declarations Emit debug information for each |
9362 | of the declarations in GLOBALS. */ | |
14338e9a | 9363 | |
c131e678 | 9364 | static void |
9365 | c_write_global_declarations_2 (tree globals) | |
9366 | { | |
9367 | tree decl; | |
9368 | ||
9369 | for (decl = globals; decl ; decl = TREE_CHAIN (decl)) | |
9370 | debug_hooks->global_decl (decl); | |
40109983 | 9371 | } |
9372 | ||
c131e678 | 9373 | /* Preserve the external declarations scope across a garbage collect. */ |
9374 | static GTY(()) tree ext_block; | |
9375 | ||
40109983 | 9376 | void |
393b349a | 9377 | c_write_global_declarations (void) |
40109983 | 9378 | { |
c131e678 | 9379 | tree t; |
d9cf68bf | 9380 | |
393b349a | 9381 | /* We don't want to do this if generating a PCH. */ |
9382 | if (pch_file) | |
9383 | return; | |
40109983 | 9384 | |
b3e83e1e | 9385 | /* Don't waste time on further processing if -fsyntax-only or we've |
9386 | encountered errors. */ | |
7f5f3953 | 9387 | if (flag_syntax_only || errorcount || sorrycount) |
b3e83e1e | 9388 | return; |
9389 | ||
aea7e1dc | 9390 | /* Close the external scope. */ |
9391 | ext_block = pop_scope (); | |
9392 | external_scope = 0; | |
231bd014 | 9393 | gcc_assert (!current_scope); |
aea7e1dc | 9394 | |
9021d2da | 9395 | if (ext_block) |
9396 | { | |
9397 | tree tmp = BLOCK_VARS (ext_block); | |
9398 | int flags; | |
9399 | FILE * stream = dump_begin (TDI_tu, &flags); | |
9400 | if (stream && tmp) | |
a0c938f0 | 9401 | { |
9402 | dump_node (tmp, flags & ~TDF_SLIM, stream); | |
9403 | dump_end (TDI_tu, stream); | |
9404 | } | |
9021d2da | 9405 | } |
c131e678 | 9406 | |
9407 | /* Process all file scopes in this compilation, and the external_scope, | |
9408 | through wrapup_global_declarations and check_global_declarations. */ | |
9409 | for (t = all_translation_units; t; t = TREE_CHAIN (t)) | |
9410 | c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t))); | |
aea7e1dc | 9411 | c_write_global_declarations_1 (BLOCK_VARS (ext_block)); |
9412 | ||
aea7e1dc | 9413 | /* We're done parsing; proceed to optimize and emit assembly. |
9414 | FIXME: shouldn't be the front end's responsibility to call this. */ | |
9415 | cgraph_optimize (); | |
c131e678 | 9416 | |
9417 | /* After cgraph has had a chance to emit everything that's going to | |
9418 | be emitted, output debug information for globals. */ | |
9419 | if (errorcount == 0 && sorrycount == 0) | |
9420 | { | |
9421 | timevar_push (TV_SYMOUT); | |
9422 | for (t = all_translation_units; t; t = TREE_CHAIN (t)) | |
9423 | c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t))); | |
9424 | c_write_global_declarations_2 (BLOCK_VARS (ext_block)); | |
9425 | timevar_pop (TV_SYMOUT); | |
9426 | } | |
9427 | ||
9428 | ext_block = NULL; | |
40109983 | 9429 | } |
9430 | ||
1f3233d1 | 9431 | #include "gt-c-decl.h" |