1 /* Definitions for c-common.c. 2 Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998, 3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008 4 Free Software Foundation, Inc. 5 6 This file is part of GCC. 7 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 10 Software Foundation; either version 3, or (at your option) any later 11 version. 12 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. 17 18 You should have received a copy of the GNU General Public License 19 along with GCC; see the file COPYING3. If not see 20 <http://www.gnu.org/licenses/>. */ 21 22 #ifndef GCC_C_COMMON_H 23 #define GCC_C_COMMON_H 24 25 #include "splay-tree.h" 26 #include "cpplib.h" 27 #include "ggc.h" 28 29 /* Usage of TREE_LANG_FLAG_?: 30 0: TREE_NEGATED_INT (in INTEGER_CST). 31 IDENTIFIER_MARKED (used by search routines). 32 DECL_PRETTY_FUNCTION_P (in VAR_DECL) 33 1: C_DECLARED_LABEL_FLAG (in LABEL_DECL) 34 STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST) 35 2: unused 36 3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST) 37 4: unused 38 */ 39 40 /* Reserved identifiers. This is the union of all the keywords for C, 41 C++, and Objective-C. All the type modifiers have to be in one 42 block at the beginning, because they are used as mask bits. There 43 are 27 type modifiers; if we add many more we will have to redesign 44 the mask mechanism. */ 45 46 enum rid 47 { 48 /* Modifiers: */ 49 /* C, in empirical order of frequency. */ 50 RID_STATIC = 0, 51 RID_UNSIGNED, RID_LONG, RID_CONST, RID_EXTERN, 52 RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE, 53 RID_VOLATILE, RID_SIGNED, RID_AUTO, RID_RESTRICT, 54 55 /* C extensions */ 56 RID_COMPLEX, RID_THREAD, RID_SAT, 57 58 /* C++ */ 59 RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE, 60 61 /* ObjC */ 62 RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY, 63 64 /* C */ 65 RID_INT, RID_CHAR, RID_FLOAT, RID_DOUBLE, RID_VOID, 66 RID_ENUM, RID_STRUCT, RID_UNION, RID_IF, RID_ELSE, 67 RID_WHILE, RID_DO, RID_FOR, RID_SWITCH, RID_CASE, 68 RID_DEFAULT, RID_BREAK, RID_CONTINUE, RID_RETURN, RID_GOTO, 69 RID_SIZEOF, 70 71 /* C extensions */ 72 RID_ASM, RID_TYPEOF, RID_ALIGNOF, RID_ATTRIBUTE, RID_VA_ARG, 73 RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL, RID_CHOOSE_EXPR, 74 RID_TYPES_COMPATIBLE_P, 75 RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128, 76 RID_FRACT, RID_ACCUM, 77 78 /* This means to warn that this is a C++ keyword, and then treat it 79 as a normal identifier. */ 80 RID_CXX_COMPAT_WARN, 81 82 /* Too many ways of getting the name of a function as a string */ 83 RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME, 84 85 /* C++ */ 86 RID_BOOL, RID_WCHAR, RID_CLASS, 87 RID_PUBLIC, RID_PRIVATE, RID_PROTECTED, 88 RID_TEMPLATE, RID_NULL, RID_CATCH, 89 RID_DELETE, RID_FALSE, RID_NAMESPACE, 90 RID_NEW, RID_OFFSETOF, RID_OPERATOR, 91 RID_THIS, RID_THROW, RID_TRUE, 92 RID_TRY, RID_TYPENAME, RID_TYPEID, 93 RID_USING, RID_CHAR16, RID_CHAR32, 94 95 /* casts */ 96 RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST, 97 98 /* C++ extensions */ 99 RID_HAS_NOTHROW_ASSIGN, RID_HAS_NOTHROW_CONSTRUCTOR, 100 RID_HAS_NOTHROW_COPY, RID_HAS_TRIVIAL_ASSIGN, 101 RID_HAS_TRIVIAL_CONSTRUCTOR, RID_HAS_TRIVIAL_COPY, 102 RID_HAS_TRIVIAL_DESTRUCTOR, RID_HAS_VIRTUAL_DESTRUCTOR, 103 RID_IS_ABSTRACT, RID_IS_BASE_OF, 104 RID_IS_CONVERTIBLE_TO, RID_IS_CLASS, 105 RID_IS_EMPTY, RID_IS_ENUM, 106 RID_IS_POD, RID_IS_POLYMORPHIC, 107 RID_IS_UNION, 108 109 /* C++0x */ 110 RID_STATIC_ASSERT, RID_DECLTYPE, 111 112 /* Objective-C */ 113 RID_AT_ENCODE, RID_AT_END, 114 RID_AT_CLASS, RID_AT_ALIAS, RID_AT_DEFS, 115 RID_AT_PRIVATE, RID_AT_PROTECTED, RID_AT_PUBLIC, 116 RID_AT_PROTOCOL, RID_AT_SELECTOR, 117 RID_AT_THROW, RID_AT_TRY, RID_AT_CATCH, 118 RID_AT_FINALLY, RID_AT_SYNCHRONIZED, 119 RID_AT_INTERFACE, 120 RID_AT_IMPLEMENTATION, 121 122 RID_MAX, 123 124 RID_FIRST_MODIFIER = RID_STATIC, 125 RID_LAST_MODIFIER = RID_ONEWAY, 126 127 RID_FIRST_CXX0X = RID_STATIC_ASSERT, 128 RID_LAST_CXX0X = RID_DECLTYPE, 129 RID_FIRST_AT = RID_AT_ENCODE, 130 RID_LAST_AT = RID_AT_IMPLEMENTATION, 131 RID_FIRST_PQ = RID_IN, 132 RID_LAST_PQ = RID_ONEWAY 133 }; 134 135 #define OBJC_IS_AT_KEYWORD(rid) \ 136 ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \ 137 (unsigned int) (rid) <= (unsigned int) RID_LAST_AT) 138 139 #define OBJC_IS_PQ_KEYWORD(rid) \ 140 ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \ 141 (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ) 142 143 /* The elements of `ridpointers' are identifier nodes for the reserved 144 type names and storage classes. It is indexed by a RID_... value. */ 145 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers; 146 147 /* Standard named or nameless data types of the C compiler. */ 148 149 enum c_tree_index 150 { 151 CTI_CHAR16_TYPE, 152 CTI_CHAR32_TYPE, 153 CTI_WCHAR_TYPE, 154 CTI_SIGNED_WCHAR_TYPE, 155 CTI_UNSIGNED_WCHAR_TYPE, 156 CTI_WINT_TYPE, 157 CTI_SIGNED_SIZE_TYPE, /* For format checking only. */ 158 CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only. */ 159 CTI_INTMAX_TYPE, 160 CTI_UINTMAX_TYPE, 161 CTI_WIDEST_INT_LIT_TYPE, 162 CTI_WIDEST_UINT_LIT_TYPE, 163 164 CTI_CHAR_ARRAY_TYPE, 165 CTI_CHAR16_ARRAY_TYPE, 166 CTI_CHAR32_ARRAY_TYPE, 167 CTI_WCHAR_ARRAY_TYPE, 168 CTI_INT_ARRAY_TYPE, 169 CTI_STRING_TYPE, 170 CTI_CONST_STRING_TYPE, 171 172 /* Type for boolean expressions (bool in C++, int in C). */ 173 CTI_TRUTHVALUE_TYPE, 174 CTI_TRUTHVALUE_TRUE, 175 CTI_TRUTHVALUE_FALSE, 176 177 CTI_DEFAULT_FUNCTION_TYPE, 178 179 /* These are not types, but we have to look them up all the time. */ 180 CTI_FUNCTION_NAME_DECL, 181 CTI_PRETTY_FUNCTION_NAME_DECL, 182 CTI_C99_FUNCTION_NAME_DECL, 183 CTI_SAVED_FUNCTION_NAME_DECLS, 184 185 CTI_VOID_ZERO, 186 187 CTI_NULL, 188 189 CTI_MAX 190 }; 191 192 #define C_CPP_HASHNODE(id) \ 193 (&(((struct c_common_identifier *) (id))->node)) 194 #define C_RID_CODE(id) \ 195 ((enum rid) (((struct c_common_identifier *) (id))->node.rid_code)) 196 #define C_SET_RID_CODE(id, code) \ 197 (((struct c_common_identifier *) (id))->node.rid_code = (unsigned char) code) 198 199 /* Identifier part common to the C front ends. Inherits from 200 tree_identifier, despite appearances. */ 201 struct c_common_identifier GTY(()) 202 { 203 struct tree_common common; 204 struct cpp_hashnode node; 205 }; 206 207 /* An entry in the reserved keyword table. */ 208 209 struct c_common_resword 210 { 211 const char *const word; 212 ENUM_BITFIELD(rid) const rid : 16; 213 const unsigned int disable : 16; 214 }; 215 216 /* Disable mask. Keywords are disabled if (reswords[i].disable & 217 mask) is _true_. Thus for keywords which are present in all 218 languages the disable field is zero. */ 219 220 #define D_CONLY 0x001 /* C only (not in C++). */ 221 #define D_CXXONLY 0x002 /* C++ only (not in C). */ 222 #define D_C99 0x004 /* In C, C99 only. */ 223 #define D_CXX0X 0x008 /* In C++, C++0X only. */ 224 #define D_EXT 0x010 /* GCC extension. */ 225 #define D_EXT89 0x020 /* GCC extension incorporated in C99. */ 226 #define D_ASM 0x040 /* Disabled by -fno-asm. */ 227 #define D_OBJC 0x080 /* In Objective C and neither C nor C++. */ 228 #define D_CXX_OBJC 0x100 /* In Objective C, and C++, but not C. */ 229 #define D_CXXWARN 0x200 /* In C warn with -Wcxx-compat. */ 230 231 /* The reserved keyword table. */ 232 extern const struct c_common_resword c_common_reswords[]; 233 234 /* The number of items in the reserved keyword table. */ 235 extern const unsigned int num_c_common_reswords; 236 237 #define char16_type_node c_global_trees[CTI_CHAR16_TYPE] 238 #define char32_type_node c_global_trees[CTI_CHAR32_TYPE] 239 #define wchar_type_node c_global_trees[CTI_WCHAR_TYPE] 240 #define signed_wchar_type_node c_global_trees[CTI_SIGNED_WCHAR_TYPE] 241 #define unsigned_wchar_type_node c_global_trees[CTI_UNSIGNED_WCHAR_TYPE] 242 #define wint_type_node c_global_trees[CTI_WINT_TYPE] 243 #define signed_size_type_node c_global_trees[CTI_SIGNED_SIZE_TYPE] 244 #define unsigned_ptrdiff_type_node c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE] 245 #define intmax_type_node c_global_trees[CTI_INTMAX_TYPE] 246 #define uintmax_type_node c_global_trees[CTI_UINTMAX_TYPE] 247 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE] 248 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE] 249 250 #define truthvalue_type_node c_global_trees[CTI_TRUTHVALUE_TYPE] 251 #define truthvalue_true_node c_global_trees[CTI_TRUTHVALUE_TRUE] 252 #define truthvalue_false_node c_global_trees[CTI_TRUTHVALUE_FALSE] 253 254 #define char_array_type_node c_global_trees[CTI_CHAR_ARRAY_TYPE] 255 #define char16_array_type_node c_global_trees[CTI_CHAR16_ARRAY_TYPE] 256 #define char32_array_type_node c_global_trees[CTI_CHAR32_ARRAY_TYPE] 257 #define wchar_array_type_node c_global_trees[CTI_WCHAR_ARRAY_TYPE] 258 #define int_array_type_node c_global_trees[CTI_INT_ARRAY_TYPE] 259 #define string_type_node c_global_trees[CTI_STRING_TYPE] 260 #define const_string_type_node c_global_trees[CTI_CONST_STRING_TYPE] 261 262 #define default_function_type c_global_trees[CTI_DEFAULT_FUNCTION_TYPE] 263 264 #define function_name_decl_node c_global_trees[CTI_FUNCTION_NAME_DECL] 265 #define pretty_function_name_decl_node c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL] 266 #define c99_function_name_decl_node c_global_trees[CTI_C99_FUNCTION_NAME_DECL] 267 #define saved_function_name_decls c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS] 268 269 /* A node for `((void) 0)'. */ 270 #define void_zero_node c_global_trees[CTI_VOID_ZERO] 271 272 /* The node for C++ `__null'. */ 273 #define null_node c_global_trees[CTI_NULL] 274 275 extern GTY(()) tree c_global_trees[CTI_MAX]; 276 277 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a 278 tree for size reasons. */ 279 struct sorted_fields_type GTY(()) 280 { 281 int len; 282 tree GTY((length ("%h.len"))) elts[1]; 283 }; 284 285 /* Mark which labels are explicitly declared. 286 These may be shadowed, and may be referenced from nested functions. */ 287 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label) 288 289 typedef enum c_language_kind 290 { 291 clk_c = 0, /* C90, C94 or C99 */ 292 clk_objc = 1, /* clk_c with ObjC features. */ 293 clk_cxx = 2, /* ANSI/ISO C++ */ 294 clk_objcxx = 3 /* clk_cxx with ObjC features. */ 295 } 296 c_language_kind; 297 298 /* To test for a specific language use c_language, defined by each 299 front end. For "ObjC features" or "not C++" use the macros. */ 300 extern c_language_kind c_language; 301 302 #define c_dialect_cxx() (c_language & clk_cxx) 303 #define c_dialect_objc() (c_language & clk_objc) 304 305 /* Information about a statement tree. */ 306 307 struct stmt_tree_s GTY(()) { 308 /* The current statement list being collected. */ 309 tree x_cur_stmt_list; 310 311 /* In C++, Nonzero if we should treat statements as full 312 expressions. In particular, this variable is no-zero if at the 313 end of a statement we should destroy any temporaries created 314 during that statement. Similarly, if, at the end of a block, we 315 should destroy any local variables in this block. Normally, this 316 variable is nonzero, since those are the normal semantics of 317 C++. 318 319 However, in order to represent aggregate initialization code as 320 tree structure, we use statement-expressions. The statements 321 within the statement expression should not result in cleanups 322 being run until the entire enclosing statement is complete. 323 324 This flag has no effect in C. */ 325 int stmts_are_full_exprs_p; 326 }; 327 328 typedef struct stmt_tree_s *stmt_tree; 329 330 /* Global state pertinent to the current function. Some C dialects 331 extend this structure with additional fields. */ 332 333 struct c_language_function GTY(()) { 334 /* While we are parsing the function, this contains information 335 about the statement-tree that we are building. */ 336 struct stmt_tree_s x_stmt_tree; 337 }; 338 339 /* When building a statement-tree, this is the current statement list 340 being collected. It's TREE_CHAIN is a back-pointer to the previous 341 statement list. */ 342 343 #define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list) 344 345 /* Language-specific hooks. */ 346 347 /* If non-NULL, this function is called after a precompile header file 348 is loaded. */ 349 extern void (*lang_post_pch_load) (void); 350 351 extern void push_file_scope (void); 352 extern void pop_file_scope (void); 353 extern stmt_tree current_stmt_tree (void); 354 extern tree push_stmt_list (void); 355 extern tree pop_stmt_list (tree); 356 extern tree add_stmt (tree); 357 extern void push_cleanup (tree, tree, bool); 358 extern tree pushdecl_top_level (tree); 359 extern tree pushdecl (tree); 360 extern tree build_modify_expr (location_t, tree, enum tree_code, tree); 361 extern tree build_indirect_ref (location_t, tree, const char *); 362 363 extern int c_expand_decl (tree); 364 365 extern int field_decl_cmp (const void *, const void *); 366 extern void resort_sorted_fields (void *, void *, gt_pointer_operator, 367 void *); 368 extern bool has_c_linkage (const_tree decl); 369 370 /* Switches common to the C front ends. */ 372 373 /* Nonzero if prepreprocessing only. */ 374 375 extern int flag_preprocess_only; 376 377 /* Zero means that faster, ...NonNil variants of objc_msgSend... 378 calls will be used in ObjC; passing nil receivers to such calls 379 will most likely result in crashes. */ 380 extern int flag_nil_receivers; 381 382 /* Nonzero means that we will allow new ObjC exception syntax (@throw, 383 @try, etc.) in source code. */ 384 extern int flag_objc_exceptions; 385 386 /* Nonzero means that we generate NeXT setjmp based exceptions. */ 387 extern int flag_objc_sjlj_exceptions; 388 389 /* Nonzero means that code generation will be altered to support 390 "zero-link" execution. This currently affects ObjC only, but may 391 affect other languages in the future. */ 392 extern int flag_zero_link; 393 394 /* Nonzero means emit an '__OBJC, __image_info' for the current translation 395 unit. It will inform the ObjC runtime that class definition(s) herein 396 contained are to replace one(s) previously loaded. */ 397 extern int flag_replace_objc_classes; 398 399 /* Nonzero means don't output line number information. */ 400 401 extern char flag_no_line_commands; 402 403 /* Nonzero causes -E output not to be done, but directives such as 404 #define that have side effects are still obeyed. */ 405 406 extern char flag_no_output; 407 408 /* Nonzero means dump macros in some fashion; contains the 'D', 'M', 409 'N' or 'U' of the command line switch. */ 410 411 extern char flag_dump_macros; 412 413 /* Nonzero means pass #include lines through to the output. */ 414 415 extern char flag_dump_includes; 416 417 /* Nonzero means process PCH files while preprocessing. */ 418 419 extern bool flag_pch_preprocess; 420 421 /* The file name to which we should write a precompiled header, or 422 NULL if no header will be written in this compile. */ 423 424 extern const char *pch_file; 425 426 /* Nonzero if an ISO standard was selected. It rejects macros in the 427 user's namespace. */ 428 429 extern int flag_iso; 430 431 /* Nonzero if -undef was given. It suppresses target built-in macros 432 and assertions. */ 433 434 extern int flag_undef; 435 436 /* Nonzero means don't recognize the non-ANSI builtin functions. */ 437 438 extern int flag_no_builtin; 439 440 /* Nonzero means don't recognize the non-ANSI builtin functions. 441 -ansi sets this. */ 442 443 extern int flag_no_nonansi_builtin; 444 445 /* Nonzero means give `double' the same size as `float'. */ 446 447 extern int flag_short_double; 448 449 /* Nonzero means give `wchar_t' the same size as `short'. */ 450 451 extern int flag_short_wchar; 452 453 /* Nonzero means allow implicit conversions between vectors with 454 differing numbers of subparts and/or differing element types. */ 455 extern int flag_lax_vector_conversions; 456 457 /* Nonzero means allow Microsoft extensions without warnings or errors. */ 458 extern int flag_ms_extensions; 459 460 /* Nonzero means don't recognize the keyword `asm'. */ 461 462 extern int flag_no_asm; 463 464 /* Nonzero means give string constants the type `const char *', as mandated 465 by the standard. */ 466 467 extern int flag_const_strings; 468 469 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */ 470 471 extern int flag_signed_bitfields; 472 473 /* Warn about #pragma directives that are not recognized. */ 474 475 extern int warn_unknown_pragmas; /* Tri state variable. */ 476 477 /* Warn about format/argument anomalies in calls to formatted I/O functions 478 (*printf, *scanf, strftime, strfmon, etc.). */ 479 480 extern int warn_format; 481 482 483 /* C/ObjC language option variables. */ 484 485 486 /* Nonzero means allow type mismatches in conditional expressions; 487 just make their values `void'. */ 488 489 extern int flag_cond_mismatch; 490 491 /* Nonzero means enable C89 Amendment 1 features. */ 492 493 extern int flag_isoc94; 494 495 /* Nonzero means use the ISO C99 dialect of C. */ 496 497 extern int flag_isoc99; 498 499 /* Nonzero means that we have builtin functions, and main is an int. */ 500 501 extern int flag_hosted; 502 503 /* ObjC language option variables. */ 504 505 506 /* Open and close the file for outputting class declarations, if 507 requested (ObjC). */ 508 509 extern int flag_gen_declaration; 510 511 /* Tells the compiler that this is a special run. Do not perform any 512 compiling, instead we are to test some platform dependent features 513 and output a C header file with appropriate definitions. */ 514 515 extern int print_struct_values; 516 517 /* ???. Undocumented. */ 518 519 extern const char *constant_string_class_name; 520 521 522 /* C++ language option variables. */ 523 524 525 /* Nonzero means don't recognize any extension keywords. */ 526 527 extern int flag_no_gnu_keywords; 528 529 /* Nonzero means do emit exported implementations of functions even if 530 they can be inlined. */ 531 532 extern int flag_implement_inlines; 533 534 /* Nonzero means that implicit instantiations will be emitted if needed. */ 535 536 extern int flag_implicit_templates; 537 538 /* Nonzero means that implicit instantiations of inline templates will be 539 emitted if needed, even if instantiations of non-inline templates 540 aren't. */ 541 542 extern int flag_implicit_inline_templates; 543 544 /* Nonzero means generate separate instantiation control files and 545 juggle them at link time. */ 546 547 extern int flag_use_repository; 548 549 /* Nonzero if we want to issue diagnostics that the standard says are not 550 required. */ 551 552 extern int flag_optional_diags; 553 554 /* Nonzero means we should attempt to elide constructors when possible. */ 555 556 extern int flag_elide_constructors; 557 558 /* Nonzero means that member functions defined in class scope are 559 inline by default. */ 560 561 extern int flag_default_inline; 562 563 /* Controls whether compiler generates 'type descriptor' that give 564 run-time type information. */ 565 566 extern int flag_rtti; 567 568 /* Nonzero if we want to conserve space in the .o files. We do this 569 by putting uninitialized data and runtime initialized data into 570 .common instead of .data at the expense of not flagging multiple 571 definitions. */ 572 573 extern int flag_conserve_space; 574 575 /* Nonzero if we want to obey access control semantics. */ 576 577 extern int flag_access_control; 578 579 /* Nonzero if we want to check the return value of new and avoid calling 580 constructors if it is a null pointer. */ 581 582 extern int flag_check_new; 583 584 /* The supported C++ dialects. */ 585 586 enum cxx_dialect { 587 /* C++98 */ 588 cxx98, 589 /* Experimental features that are likely to become part of 590 C++0x. */ 591 cxx0x 592 }; 593 594 /* The C++ dialect being used. C++98 is the default. */ 595 extern enum cxx_dialect cxx_dialect; 596 597 /* Nonzero if we want the new ISO rules for pushing a new scope for `for' 598 initialization variables. 599 0: Old rules, set by -fno-for-scope. 600 2: New ISO rules, set by -ffor-scope. 601 1: Try to implement new ISO rules, but with backup compatibility 602 (and warnings). This is the default, for now. */ 603 604 extern int flag_new_for_scope; 605 606 /* Nonzero if we want to emit defined symbols with common-like linkage as 607 weak symbols where possible, in order to conform to C++ semantics. 608 Otherwise, emit them as local symbols. */ 609 610 extern int flag_weak; 611 612 /* 0 means we want the preprocessor to not emit line directives for 613 the current working directory. 1 means we want it to do it. -1 614 means we should decide depending on whether debugging information 615 is being emitted or not. */ 616 617 extern int flag_working_directory; 618 619 /* Nonzero to use __cxa_atexit, rather than atexit, to register 620 destructors for local statics and global objects. */ 621 622 extern int flag_use_cxa_atexit; 623 624 /* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling 625 logic. */ 626 627 extern int flag_use_cxa_get_exception_ptr; 628 629 /* Nonzero means to implement standard semantics for exception 630 specifications, calling unexpected if an exception is thrown that 631 doesn't match the specification. Zero means to treat them as 632 assertions and optimize accordingly, but not check them. */ 633 634 extern int flag_enforce_eh_specs; 635 636 /* Nonzero (the default) means to generate thread-safe code for 637 initializing local statics. */ 638 639 extern int flag_threadsafe_statics; 640 641 /* Nonzero means warn about implicit declarations. */ 642 643 extern int warn_implicit; 644 645 /* Warn about using __null (as NULL in C++) as sentinel. For code compiled 646 with GCC this doesn't matter as __null is guaranteed to have the right 647 size. */ 648 649 extern int warn_strict_null_sentinel; 650 651 /* Maximum template instantiation depth. This limit is rather 652 arbitrary, but it exists to limit the time it takes to notice 653 infinite template instantiations. */ 654 655 extern int max_tinst_depth; 656 657 /* Nonzero means the expression being parsed will never be evaluated. 658 This is a count, since unevaluated expressions can nest. */ 659 660 extern int skip_evaluation; 661 662 /* C types are partitioned into three subsets: object, function, and 663 incomplete types. */ 664 #define C_TYPE_OBJECT_P(type) \ 665 (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type)) 666 667 #define C_TYPE_INCOMPLETE_P(type) \ 668 (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0) 669 670 #define C_TYPE_FUNCTION_P(type) \ 671 (TREE_CODE (type) == FUNCTION_TYPE) 672 673 /* For convenience we define a single macro to identify the class of 674 object or incomplete types. */ 675 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \ 676 (!C_TYPE_FUNCTION_P (type)) 677 678 /* Attribute table common to the C front ends. */ 679 extern const struct attribute_spec c_common_attribute_table[]; 680 extern const struct attribute_spec c_common_format_attribute_table[]; 681 682 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc. 683 ID is the identifier to use, NAME is the string. 684 TYPE_DEP indicates whether it depends on type of the function or not 685 (i.e. __PRETTY_FUNCTION__). */ 686 687 extern tree (*make_fname_decl) (tree, int); 688 689 extern tree identifier_global_value (tree); 690 extern void record_builtin_type (enum rid, const char *, tree); 691 extern tree build_void_list_node (void); 692 extern void start_fname_decls (void); 693 extern void finish_fname_decls (void); 694 extern const char *fname_as_string (int); 695 extern tree fname_decl (location_t, unsigned, tree); 696 697 extern void check_function_arguments (tree, int, tree *, tree); 698 extern void check_function_arguments_recurse (void (*) 699 (void *, tree, 700 unsigned HOST_WIDE_INT), 701 void *, tree, 702 unsigned HOST_WIDE_INT); 703 extern bool check_builtin_function_arguments (tree, int, tree *); 704 extern void check_function_format (tree, int, tree *); 705 extern void set_Wformat (int); 706 extern tree handle_format_attribute (tree *, tree, tree, int, bool *); 707 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *); 708 extern int c_common_handle_option (size_t code, const char *arg, int value); 709 extern bool c_common_missing_argument (const char *opt, size_t code); 710 extern tree c_common_type_for_mode (enum machine_mode, int); 711 extern tree c_common_type_for_size (unsigned int, int); 712 extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int, 713 int, int); 714 extern tree c_common_unsigned_type (tree); 715 extern tree c_common_signed_type (tree); 716 extern tree c_common_signed_or_unsigned_type (int, tree); 717 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int); 718 extern bool decl_with_nonnull_addr_p (const_tree); 719 extern tree c_common_truthvalue_conversion (location_t, tree); 720 extern void c_apply_type_quals_to_decl (int, tree); 721 extern tree c_sizeof_or_alignof_type (tree, bool, int); 722 extern tree c_alignof_expr (tree); 723 /* Print an error message for invalid operands to arith operation CODE. 724 NOP_EXPR is used as a special case (see truthvalue_conversion). */ 725 extern void binary_op_error (location_t, enum tree_code, tree, tree); 726 extern tree fix_string_type (tree); 727 struct varray_head_tag; 728 extern void constant_expression_warning (tree); 729 extern void constant_expression_error (tree); 730 extern bool strict_aliasing_warning (tree, tree, tree); 731 extern void warnings_for_convert_and_check (tree, tree, tree); 732 extern tree convert_and_check (tree, tree); 733 extern void overflow_warning (tree); 734 extern void warn_logical_operator (enum tree_code, tree, tree); 735 extern void check_main_parameter_types (tree decl); 736 extern bool c_determine_visibility (tree); 737 extern bool same_scalar_type_ignoring_signedness (tree, tree); 738 739 #define c_sizeof(T) c_sizeof_or_alignof_type (T, true, 1) 740 #define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1) 741 742 /* Subroutine of build_binary_op, used for certain operations. */ 743 extern tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise); 744 745 /* Subroutine of build_binary_op, used for comparison operations. 746 See if the operands have both been converted from subword integer types 747 and, if so, perhaps change them both back to their original type. */ 748 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *); 749 750 extern tree pointer_int_sum (enum tree_code, tree, tree); 751 752 /* Add qualifiers to a type, in the fashion for C. */ 753 extern tree c_build_qualified_type (tree, int); 754 755 /* Build tree nodes and builtin functions common to both C and C++ language 756 frontends. */ 757 extern void c_common_nodes_and_builtins (void); 758 759 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec); 760 761 extern void disable_builtin_function (const char *); 762 763 extern void set_compound_literal_name (tree decl); 764 765 extern tree build_va_arg (tree, tree); 766 767 extern unsigned int c_common_init_options (unsigned int, const char **); 768 extern bool c_common_post_options (const char **); 769 extern bool c_common_init (void); 770 extern void c_common_finish (void); 771 extern void c_common_parse_file (int); 772 extern alias_set_type c_common_get_alias_set (tree); 773 extern void c_register_builtin_type (tree, const char*); 774 extern bool c_promoting_integer_type_p (const_tree); 775 extern int self_promoting_args_p (const_tree); 776 extern tree strip_pointer_operator (tree); 777 extern tree strip_pointer_or_array_types (tree); 778 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT); 779 780 /* This is the basic parsing function. */ 781 extern void c_parse_file (void); 782 /* This is misnamed, it actually performs end-of-compilation processing. */ 783 extern void finish_file (void); 784 785 786 /* These macros provide convenient access to the various _STMT nodes. */ 787 788 /* Nonzero if a given STATEMENT_LIST represents the outermost binding 789 if a statement expression. */ 790 #define STATEMENT_LIST_STMT_EXPR(NODE) \ 791 TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE)) 792 793 /* Nonzero if a label has been added to the statement list. */ 794 #define STATEMENT_LIST_HAS_LABEL(NODE) \ 795 TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE)) 796 797 /* COMPOUND_LITERAL_EXPR accessors. */ 798 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE) \ 799 TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0) 800 #define COMPOUND_LITERAL_EXPR_DECL(NODE) \ 801 DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE)) 802 803 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield. */ 804 #define DECL_C_BIT_FIELD(NODE) \ 805 (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1) 806 #define SET_DECL_C_BIT_FIELD(NODE) \ 807 (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1) 808 #define CLEAR_DECL_C_BIT_FIELD(NODE) \ 809 (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0) 810 811 extern void emit_local_var (tree); 812 extern tree do_case (tree, tree); 813 extern tree build_stmt (enum tree_code, ...); 814 extern tree build_case_label (tree, tree, tree); 815 816 /* These functions must be defined by each front-end which implements 817 a variant of the C language. They are used in c-common.c. */ 818 819 extern tree build_unary_op (location_t, enum tree_code, tree, int); 820 extern tree build_binary_op (location_t, enum tree_code, tree, tree, int); 821 extern tree perform_integral_promotions (tree); 822 823 /* These functions must be defined by each front-end which implements 824 a variant of the C language. They are used by port files. */ 825 826 extern tree default_conversion (tree); 827 828 /* Given two integer or real types, return the type for their sum. 829 Given two compatible ANSI C types, returns the merged type. */ 830 831 extern tree common_type (tree, tree); 832 833 extern tree decl_constant_value (tree); 834 835 /* Handle increment and decrement of boolean types. */ 836 extern tree boolean_increment (enum tree_code, tree); 837 838 extern int case_compare (splay_tree_key, splay_tree_key); 839 840 extern tree c_add_case_label (splay_tree, tree, tree, tree, tree); 841 842 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree); 843 844 extern tree build_function_call (tree, tree); 845 846 extern tree resolve_overloaded_builtin (tree, tree); 847 848 extern tree finish_label_address_expr (tree, location_t); 849 850 /* Same function prototype, but the C and C++ front ends have 851 different implementations. Used in c-common.c. */ 852 extern tree lookup_label (tree); 853 extern tree lookup_name (tree); 854 855 extern bool vector_targets_convertible_p (const_tree t1, const_tree t2); 856 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note); 857 858 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *); 859 860 extern tree c_staticp (tree); 861 862 extern void init_c_lex (void); 863 864 extern void c_cpp_builtins (cpp_reader *); 865 extern void c_cpp_builtins_optimize_pragma (cpp_reader *, tree, tree); 866 867 /* Positive if an implicit `extern "C"' scope has just been entered; 868 negative if such a scope has just been exited. */ 869 extern GTY(()) int pending_lang_change; 870 871 /* Information recorded about each file examined during compilation. */ 872 873 struct c_fileinfo 874 { 875 int time; /* Time spent in the file. */ 876 877 /* Flags used only by C++. 878 INTERFACE_ONLY nonzero means that we are in an "interface" section 879 of the compiler. INTERFACE_UNKNOWN nonzero means we cannot trust 880 the value of INTERFACE_ONLY. If INTERFACE_UNKNOWN is zero and 881 INTERFACE_ONLY is zero, it means that we are responsible for 882 exporting definitions that others might need. */ 883 short interface_only; 884 short interface_unknown; 885 }; 886 887 struct c_fileinfo *get_fileinfo (const char *); 888 extern void dump_time_statistics (void); 889 890 extern bool c_dump_tree (void *, tree); 891 892 extern void c_warn_unused_result (gimple_seq); 893 894 extern void verify_sequence_points (tree); 895 896 extern tree fold_offsetof (tree, tree); 897 898 /* Places where an lvalue, or modifiable lvalue, may be required. 899 Used to select diagnostic messages in lvalue_error and 900 readonly_error. */ 901 enum lvalue_use { 902 lv_assign, 903 lv_increment, 904 lv_decrement, 905 lv_addressof, 906 lv_asm 907 }; 908 909 extern void lvalue_error (enum lvalue_use); 910 911 extern int complete_array_type (tree *, tree, bool); 912 913 extern tree builtin_type_for_size (int, bool); 914 915 extern void warn_array_subscript_with_type_char (tree); 916 extern void warn_about_parentheses (enum tree_code, 917 enum tree_code, tree, 918 enum tree_code, tree); 919 extern void warn_for_unused_label (tree label); 920 extern void warn_for_div_by_zero (location_t, tree divisor); 921 extern void warn_for_sign_compare (location_t, 922 tree orig_op0, tree orig_op1, 923 tree op0, tree op1, 924 tree result_type, 925 enum tree_code resultcode); 926 extern void check_for_self_assign (location_t, tree, tree); 927 928 /* In c-gimplify.c */ 929 extern void c_genericize (tree); 930 extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *); 931 extern tree c_build_bind_expr (tree, tree); 932 933 /* In c-pch.c */ 934 extern void pch_init (void); 935 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd); 936 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd, 937 const char *orig); 938 extern void c_common_write_pch (void); 939 extern void c_common_no_more_pch (void); 940 extern void c_common_pch_pragma (cpp_reader *pfile, const char *); 941 extern void c_common_print_pch_checksum (FILE *f); 942 943 /* In *-checksum.c */ 944 extern const unsigned char executable_checksum[16]; 945 946 /* In c-cppbuiltin.c */ 947 extern void builtin_define_std (const char *macro); 948 extern void builtin_define_with_value (const char *, const char *, int); 949 extern void c_stddef_cpp_builtins (void); 950 extern void fe_file_change (const struct line_map *); 951 extern void c_parse_error (const char *, enum cpp_ttype, tree); 952 953 /* Objective-C / Objective-C++ entry points. */ 954 955 /* The following ObjC/ObjC++ functions are called by the C and/or C++ 956 front-ends; they all must have corresponding stubs in stub-objc.c. */ 957 extern tree objc_is_class_name (tree); 958 extern tree objc_is_object_ptr (tree); 959 extern void objc_check_decl (tree); 960 extern int objc_is_reserved_word (tree); 961 extern bool objc_compare_types (tree, tree, int, tree); 962 extern void objc_volatilize_decl (tree); 963 extern bool objc_type_quals_match (tree, tree); 964 extern tree objc_rewrite_function_call (tree, tree); 965 extern tree objc_message_selector (void); 966 extern tree objc_lookup_ivar (tree, tree); 967 extern void objc_clear_super_receiver (void); 968 extern int objc_is_public (tree, tree); 969 extern tree objc_is_id (tree); 970 extern void objc_declare_alias (tree, tree); 971 extern void objc_declare_class (tree); 972 extern void objc_declare_protocols (tree); 973 extern tree objc_build_message_expr (tree); 974 extern tree objc_finish_message_expr (tree, tree, tree); 975 extern tree objc_build_selector_expr (tree); 976 extern tree objc_build_protocol_expr (tree); 977 extern tree objc_build_encode_expr (tree); 978 extern tree objc_build_string_object (tree); 979 extern tree objc_get_protocol_qualified_type (tree, tree); 980 extern tree objc_get_class_reference (tree); 981 extern tree objc_get_class_ivars (tree); 982 extern void objc_start_class_interface (tree, tree, tree); 983 extern void objc_start_category_interface (tree, tree, tree); 984 extern void objc_start_protocol (tree, tree); 985 extern void objc_continue_interface (void); 986 extern void objc_finish_interface (void); 987 extern void objc_start_class_implementation (tree, tree); 988 extern void objc_start_category_implementation (tree, tree); 989 extern void objc_continue_implementation (void); 990 extern void objc_finish_implementation (void); 991 extern void objc_set_visibility (int); 992 extern void objc_set_method_type (enum tree_code); 993 extern tree objc_build_method_signature (tree, tree, tree, bool); 994 extern void objc_add_method_declaration (tree); 995 extern void objc_start_method_definition (tree); 996 extern void objc_finish_method_definition (tree); 997 extern void objc_add_instance_variable (tree); 998 extern tree objc_build_keyword_decl (tree, tree, tree); 999 extern tree objc_build_throw_stmt (tree); 1000 extern void objc_begin_try_stmt (location_t, tree); 1001 extern tree objc_finish_try_stmt (void); 1002 extern void objc_begin_catch_clause (tree); 1003 extern void objc_finish_catch_clause (void); 1004 extern void objc_build_finally_clause (location_t, tree); 1005 extern tree objc_build_synchronized (location_t, tree, tree); 1006 extern int objc_static_init_needed_p (void); 1007 extern tree objc_generate_static_init_call (tree); 1008 extern tree objc_generate_write_barrier (tree, enum tree_code, tree); 1009 1010 /* The following are provided by the C and C++ front-ends, and called by 1011 ObjC/ObjC++. */ 1012 extern void *objc_get_current_scope (void); 1013 extern void objc_mark_locals_volatile (void *); 1014 1015 /* In c-ppoutput.c */ 1016 extern void init_pp_output (FILE *); 1017 extern void preprocess_file (cpp_reader *); 1018 extern void pp_file_change (const struct line_map *); 1019 extern void pp_dir_change (cpp_reader *, const char *); 1020 extern bool check_missing_format_attribute (tree, tree); 1021 1022 /* In c-omp.c */ 1023 extern tree c_finish_omp_master (tree); 1024 extern tree c_finish_omp_critical (tree, tree); 1025 extern tree c_finish_omp_ordered (tree); 1026 extern void c_finish_omp_barrier (void); 1027 extern tree c_finish_omp_atomic (enum tree_code, tree, tree); 1028 extern void c_finish_omp_flush (void); 1029 extern void c_finish_omp_taskwait (void); 1030 extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree); 1031 extern void c_split_parallel_clauses (tree, tree *, tree *); 1032 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree); 1033 1034 /* Not in c-omp.c; provided by the front end. */ 1035 extern bool c_omp_sharing_predetermined (tree); 1036 extern tree c_omp_remap_decl (tree, bool); 1037 extern void record_types_used_by_current_var_decl (tree); 1038 1039 /* In order for the format checking to accept the C frontend 1040 diagnostic framework extensions, you must include this file before 1041 toplev.h, not after. The C front end formats are a subset of those 1042 for C++, so they are the appropriate set to use in common code; 1043 cp-tree.h overrides this for C++. */ 1044 #ifndef GCC_DIAG_STYLE 1045 #define GCC_DIAG_STYLE __gcc_cdiag__ 1046 #endif 1047 1048 #endif /* ! GCC_C_COMMON_H */ 1049
