c-common.h revision 259405
1238104Sdes/* Definitions for c-common.c. 2238104Sdes Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998, 3238104Sdes 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. 4238104Sdes 5238104SdesThis file is part of GCC. 6238104Sdes 7238104SdesGCC is free software; you can redistribute it and/or modify it under 8238104Sdesthe terms of the GNU General Public License as published by the Free 9238104SdesSoftware Foundation; either version 2, or (at your option) any later 10238104Sdesversion. 11238104Sdes 12238104SdesGCC is distributed in the hope that it will be useful, but WITHOUT ANY 13238104SdesWARRANTY; without even the implied warranty of MERCHANTABILITY or 14238104SdesFITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15238104Sdesfor more details. 16238104Sdes 17238104SdesYou should have received a copy of the GNU General Public License 18238104Sdesalong with GCC; see the file COPYING. If not, write to the Free 19238104SdesSoftware Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 20238104Sdes02110-1301, USA. */ 21238104Sdes 22238104Sdes#ifndef GCC_C_COMMON_H 23238104Sdes#define GCC_C_COMMON_H 24238104Sdes 25238104Sdes#include "splay-tree.h" 26238104Sdes#include "cpplib.h" 27238104Sdes#include "ggc.h" 28238104Sdes 29238104Sdes/* Usage of TREE_LANG_FLAG_?: 30238104Sdes 0: TREE_NEGATED_INT (in INTEGER_CST). 31238104Sdes IDENTIFIER_MARKED (used by search routines). 32238104Sdes DECL_PRETTY_FUNCTION_P (in VAR_DECL) 33238104Sdes 1: C_DECLARED_LABEL_FLAG (in LABEL_DECL) 34238104Sdes STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST) 35238104Sdes 2: unused 36238104Sdes 3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST) 37238104Sdes 4: unused 38238104Sdes*/ 39238104Sdes 40238104Sdes/* Reserved identifiers. This is the union of all the keywords for C, 41238104Sdes C++, and Objective-C. All the type modifiers have to be in one 42238104Sdes block at the beginning, because they are used as mask bits. There 43238104Sdes are 27 type modifiers; if we add many more we will have to redesign 44238104Sdes the mask mechanism. */ 45238104Sdes 46238104Sdesenum rid 47238104Sdes{ 48238104Sdes /* Modifiers: */ 49238104Sdes /* C, in empirical order of frequency. */ 50238104Sdes RID_STATIC = 0, 51238104Sdes RID_UNSIGNED, RID_LONG, RID_CONST, RID_EXTERN, 52238104Sdes RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE, 53238104Sdes RID_VOLATILE, RID_SIGNED, RID_AUTO, RID_RESTRICT, 54238104Sdes 55238104Sdes /* C extensions */ 56238104Sdes RID_COMPLEX, RID_THREAD, 57238104Sdes 58238104Sdes /* C++ */ 59238104Sdes RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE, 60238104Sdes 61238104Sdes /* ObjC */ 62238104Sdes RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY, 63238104Sdes 64238104Sdes /* C */ 65238104Sdes RID_INT, RID_CHAR, RID_FLOAT, RID_DOUBLE, RID_VOID, 66238104Sdes RID_ENUM, RID_STRUCT, RID_UNION, RID_IF, RID_ELSE, 67238104Sdes RID_WHILE, RID_DO, RID_FOR, RID_SWITCH, RID_CASE, 68238104Sdes RID_DEFAULT, RID_BREAK, RID_CONTINUE, RID_RETURN, RID_GOTO, 69238104Sdes RID_SIZEOF, 70238104Sdes 71238104Sdes /* C extensions */ 72238104Sdes RID_ASM, RID_TYPEOF, RID_ALIGNOF, RID_ATTRIBUTE, RID_VA_ARG, 73238104Sdes RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL, RID_CHOOSE_EXPR, 74238104Sdes RID_TYPES_COMPATIBLE_P, 75238104Sdes RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128, 76238104Sdes 77238104Sdes /* Too many ways of getting the name of a function as a string */ 78238104Sdes RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME, 79238104Sdes 80238104Sdes /* C++ */ 81238104Sdes RID_BOOL, RID_WCHAR, RID_CLASS, 82238104Sdes RID_PUBLIC, RID_PRIVATE, RID_PROTECTED, 83238104Sdes RID_TEMPLATE, RID_NULL, RID_CATCH, 84238104Sdes RID_DELETE, RID_FALSE, RID_NAMESPACE, 85238104Sdes RID_NEW, RID_OFFSETOF, RID_OPERATOR, 86238104Sdes RID_THIS, RID_THROW, RID_TRUE, 87238104Sdes RID_TRY, RID_TYPENAME, RID_TYPEID, 88238104Sdes RID_USING, 89238104Sdes 90238104Sdes /* casts */ 91238104Sdes RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST, 92238104Sdes 93238104Sdes /* Objective-C */ 94238104Sdes RID_AT_ENCODE, RID_AT_END, 95238104Sdes RID_AT_CLASS, RID_AT_ALIAS, RID_AT_DEFS, 96238104Sdes RID_AT_PRIVATE, RID_AT_PROTECTED, RID_AT_PUBLIC, 97238104Sdes RID_AT_PROTOCOL, RID_AT_SELECTOR, 98238104Sdes RID_AT_THROW, RID_AT_TRY, RID_AT_CATCH, 99238104Sdes RID_AT_FINALLY, RID_AT_SYNCHRONIZED, 100238104Sdes RID_AT_INTERFACE, 101238104Sdes RID_AT_IMPLEMENTATION, 102238104Sdes 103238104Sdes RID_MAX, 104238104Sdes 105238104Sdes RID_FIRST_MODIFIER = RID_STATIC, 106238104Sdes RID_LAST_MODIFIER = RID_ONEWAY, 107238104Sdes 108238104Sdes RID_FIRST_AT = RID_AT_ENCODE, 109238104Sdes RID_LAST_AT = RID_AT_IMPLEMENTATION, 110238104Sdes RID_FIRST_PQ = RID_IN, 111238104Sdes RID_LAST_PQ = RID_ONEWAY 112238104Sdes}; 113238104Sdes 114238104Sdes#define OBJC_IS_AT_KEYWORD(rid) \ 115238104Sdes ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \ 116238104Sdes (unsigned int) (rid) <= (unsigned int) RID_LAST_AT) 117238104Sdes 118238104Sdes#define OBJC_IS_PQ_KEYWORD(rid) \ 119238104Sdes ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \ 120238104Sdes (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ) 121238104Sdes 122238104Sdes/* The elements of `ridpointers' are identifier nodes for the reserved 123238104Sdes type names and storage classes. It is indexed by a RID_... value. */ 124238104Sdesextern GTY ((length ("(int) RID_MAX"))) tree *ridpointers; 125238104Sdes 126238104Sdes/* Standard named or nameless data types of the C compiler. */ 127238104Sdes 128238104Sdesenum c_tree_index 129238104Sdes{ 130238104Sdes CTI_WCHAR_TYPE, 131238104Sdes CTI_SIGNED_WCHAR_TYPE, 132238104Sdes CTI_UNSIGNED_WCHAR_TYPE, 133238104Sdes CTI_WINT_TYPE, 134238104Sdes CTI_SIGNED_SIZE_TYPE, /* For format checking only. */ 135238104Sdes CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only. */ 136238104Sdes CTI_INTMAX_TYPE, 137238104Sdes CTI_UINTMAX_TYPE, 138238104Sdes CTI_WIDEST_INT_LIT_TYPE, 139238104Sdes CTI_WIDEST_UINT_LIT_TYPE, 140238104Sdes 141238104Sdes CTI_CHAR_ARRAY_TYPE, 142238104Sdes CTI_WCHAR_ARRAY_TYPE, 143238104Sdes CTI_INT_ARRAY_TYPE, 144238104Sdes CTI_STRING_TYPE, 145238104Sdes CTI_CONST_STRING_TYPE, 146238104Sdes 147238104Sdes /* Type for boolean expressions (bool in C++, int in C). */ 148238104Sdes CTI_TRUTHVALUE_TYPE, 149238104Sdes CTI_TRUTHVALUE_TRUE, 150238104Sdes CTI_TRUTHVALUE_FALSE, 151238104Sdes 152238104Sdes CTI_DEFAULT_FUNCTION_TYPE, 153238104Sdes 154238104Sdes /* These are not types, but we have to look them up all the time. */ 155238104Sdes CTI_FUNCTION_NAME_DECL, 156238104Sdes CTI_PRETTY_FUNCTION_NAME_DECL, 157238104Sdes CTI_C99_FUNCTION_NAME_DECL, 158238104Sdes CTI_SAVED_FUNCTION_NAME_DECLS, 159238104Sdes 160238104Sdes CTI_VOID_ZERO, 161238104Sdes 162238104Sdes CTI_NULL, 163238104Sdes 164238104Sdes CTI_MAX 165238104Sdes}; 166238104Sdes 167238104Sdes#define C_RID_CODE(id) (((struct c_common_identifier *) (id))->node.rid_code) 168238104Sdes 169238104Sdes/* Identifier part common to the C front ends. Inherits from 170238104Sdes tree_identifier, despite appearances. */ 171238104Sdesstruct c_common_identifier GTY(()) 172238104Sdes{ 173238104Sdes struct tree_common common; 174238104Sdes struct cpp_hashnode node; 175238104Sdes}; 176238104Sdes 177238104Sdes#define wchar_type_node c_global_trees[CTI_WCHAR_TYPE] 178238104Sdes#define signed_wchar_type_node c_global_trees[CTI_SIGNED_WCHAR_TYPE] 179238104Sdes#define unsigned_wchar_type_node c_global_trees[CTI_UNSIGNED_WCHAR_TYPE] 180238104Sdes#define wint_type_node c_global_trees[CTI_WINT_TYPE] 181238104Sdes#define signed_size_type_node c_global_trees[CTI_SIGNED_SIZE_TYPE] 182238104Sdes#define unsigned_ptrdiff_type_node c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE] 183238104Sdes#define intmax_type_node c_global_trees[CTI_INTMAX_TYPE] 184238104Sdes#define uintmax_type_node c_global_trees[CTI_UINTMAX_TYPE] 185238104Sdes#define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE] 186238104Sdes#define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE] 187238104Sdes 188238104Sdes#define truthvalue_type_node c_global_trees[CTI_TRUTHVALUE_TYPE] 189238104Sdes#define truthvalue_true_node c_global_trees[CTI_TRUTHVALUE_TRUE] 190238104Sdes#define truthvalue_false_node c_global_trees[CTI_TRUTHVALUE_FALSE] 191238104Sdes 192238104Sdes#define char_array_type_node c_global_trees[CTI_CHAR_ARRAY_TYPE] 193238104Sdes#define wchar_array_type_node c_global_trees[CTI_WCHAR_ARRAY_TYPE] 194238104Sdes#define int_array_type_node c_global_trees[CTI_INT_ARRAY_TYPE] 195238104Sdes#define string_type_node c_global_trees[CTI_STRING_TYPE] 196238104Sdes#define const_string_type_node c_global_trees[CTI_CONST_STRING_TYPE] 197238104Sdes 198238104Sdes#define default_function_type c_global_trees[CTI_DEFAULT_FUNCTION_TYPE] 199238104Sdes 200238104Sdes#define function_name_decl_node c_global_trees[CTI_FUNCTION_NAME_DECL] 201238104Sdes#define pretty_function_name_decl_node c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL] 202238104Sdes#define c99_function_name_decl_node c_global_trees[CTI_C99_FUNCTION_NAME_DECL] 203238104Sdes#define saved_function_name_decls c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS] 204238104Sdes 205238104Sdes/* A node for `((void) 0)'. */ 206238104Sdes#define void_zero_node c_global_trees[CTI_VOID_ZERO] 207238104Sdes 208238104Sdes/* The node for C++ `__null'. */ 209238104Sdes#define null_node c_global_trees[CTI_NULL] 210238104Sdes 211238104Sdesextern GTY(()) tree c_global_trees[CTI_MAX]; 212238104Sdes 213238104Sdes/* In a RECORD_TYPE, a sorted array of the fields of the type, not a 214238104Sdes tree for size reasons. */ 215238104Sdesstruct sorted_fields_type GTY(()) 216238104Sdes{ 217238104Sdes int len; 218238104Sdes tree GTY((length ("%h.len"))) elts[1]; 219238104Sdes}; 220238104Sdes 221238104Sdes/* Mark which labels are explicitly declared. 222238104Sdes These may be shadowed, and may be referenced from nested functions. */ 223238104Sdes#define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label) 224238104Sdes 225238104Sdestypedef enum c_language_kind 226238104Sdes{ 227238104Sdes clk_c = 0, /* C90, C94 or C99 */ 228238104Sdes clk_objc = 1, /* clk_c with ObjC features. */ 229238104Sdes clk_cxx = 2, /* ANSI/ISO C++ */ 230238104Sdes clk_objcxx = 3 /* clk_cxx with ObjC features. */ 231238104Sdes} 232238104Sdesc_language_kind; 233238104Sdes 234238104Sdes/* To test for a specific language use c_language, defined by each 235238104Sdes front end. For "ObjC features" or "not C++" use the macros. */ 236238104Sdesextern c_language_kind c_language; 237238104Sdes 238238104Sdes#define c_dialect_cxx() (c_language & clk_cxx) 239238104Sdes#define c_dialect_objc() (c_language & clk_objc) 240238104Sdes 241238104Sdes/* Information about a statement tree. */ 242238104Sdes 243238104Sdesstruct stmt_tree_s GTY(()) { 244238104Sdes /* The current statement list being collected. */ 245238104Sdes tree x_cur_stmt_list; 246238104Sdes 247238104Sdes /* In C++, Nonzero if we should treat statements as full 248238104Sdes expressions. In particular, this variable is no-zero if at the 249238104Sdes end of a statement we should destroy any temporaries created 250238104Sdes during that statement. Similarly, if, at the end of a block, we 251238104Sdes should destroy any local variables in this block. Normally, this 252238104Sdes variable is nonzero, since those are the normal semantics of 253238104Sdes C++. 254238104Sdes 255238104Sdes However, in order to represent aggregate initialization code as 256238104Sdes tree structure, we use statement-expressions. The statements 257238104Sdes within the statement expression should not result in cleanups 258238104Sdes being run until the entire enclosing statement is complete. 259238104Sdes 260238104Sdes This flag has no effect in C. */ 261238104Sdes int stmts_are_full_exprs_p; 262238104Sdes}; 263238104Sdes 264238104Sdestypedef struct stmt_tree_s *stmt_tree; 265238104Sdes 266238104Sdes/* Global state pertinent to the current function. Some C dialects 267238104Sdes extend this structure with additional fields. */ 268238104Sdes 269238104Sdesstruct c_language_function GTY(()) { 270238104Sdes /* While we are parsing the function, this contains information 271238104Sdes about the statement-tree that we are building. */ 272238104Sdes struct stmt_tree_s x_stmt_tree; 273238104Sdes}; 274238104Sdes 275238104Sdes/* When building a statement-tree, this is the current statement list 276238104Sdes being collected. It's TREE_CHAIN is a back-pointer to the previous 277238104Sdes statement list. */ 278238104Sdes 279238104Sdes#define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list) 280238104Sdes 281238104Sdes/* Language-specific hooks. */ 282238104Sdes 283238104Sdes/* Callback that determines if it's ok for a function to have no 284238104Sdes noreturn attribute. */ 285238104Sdesextern int (*lang_missing_noreturn_ok_p) (tree); 286238104Sdes 287238104Sdes/* If non-NULL, this function is called after a precompile header file 288238104Sdes is loaded. */ 289238104Sdesextern void (*lang_post_pch_load) (void); 290238104Sdes 291238104Sdesextern void push_file_scope (void); 292238104Sdesextern void pop_file_scope (void); 293238104Sdesextern stmt_tree current_stmt_tree (void); 294238104Sdesextern tree push_stmt_list (void); 295238104Sdesextern tree pop_stmt_list (tree); 296238104Sdesextern tree add_stmt (tree); 297238104Sdesextern void push_cleanup (tree, tree, bool); 298238104Sdesextern tree pushdecl_top_level (tree); 299238104Sdesextern tree pushdecl (tree); 300238104Sdesextern tree build_modify_expr (tree, enum tree_code, tree); 301238104Sdesextern tree build_indirect_ref (tree, const char *); 302238104Sdes 303238104Sdesextern int c_expand_decl (tree); 304238104Sdes 305238104Sdesextern int field_decl_cmp (const void *, const void *); 306238104Sdesextern void resort_sorted_fields (void *, void *, gt_pointer_operator, 307238104Sdes void *); 308238104Sdesextern bool has_c_linkage (tree decl); 309238104Sdes 310238104Sdes/* Switches common to the C front ends. */ 311238104Sdes 312238104Sdes/* Nonzero if prepreprocessing only. */ 313238104Sdes 314238104Sdesextern int flag_preprocess_only; 315238104Sdes 316238104Sdes/* Zero means that faster, ...NonNil variants of objc_msgSend... 317238104Sdes calls will be used in ObjC; passing nil receivers to such calls 318238104Sdes will most likely result in crashes. */ 319238104Sdesextern int flag_nil_receivers; 320238104Sdes 321238104Sdes/* Nonzero means that we will allow new ObjC exception syntax (@throw, 322238104Sdes @try, etc.) in source code. */ 323238104Sdesextern int flag_objc_exceptions; 324238104Sdes 325238104Sdes/* Nonzero means that we generate NeXT setjmp based exceptions. */ 326238104Sdesextern int flag_objc_sjlj_exceptions; 327238104Sdes 328238104Sdes/* Nonzero means that code generation will be altered to support 329238104Sdes "zero-link" execution. This currently affects ObjC only, but may 330238104Sdes affect other languages in the future. */ 331238104Sdesextern int flag_zero_link; 332238104Sdes 333238104Sdes/* Nonzero means emit an '__OBJC, __image_info' for the current translation 334238104Sdes unit. It will inform the ObjC runtime that class definition(s) herein 335238104Sdes contained are to replace one(s) previously loaded. */ 336238104Sdesextern int flag_replace_objc_classes; 337238104Sdes 338238104Sdes/* Nonzero means don't output line number information. */ 339238104Sdes 340238104Sdesextern char flag_no_line_commands; 341238104Sdes 342238104Sdes/* Nonzero causes -E output not to be done, but directives such as 343238104Sdes #define that have side effects are still obeyed. */ 344238104Sdes 345238104Sdesextern char flag_no_output; 346238104Sdes 347238104Sdes/* Nonzero means dump macros in some fashion; contains the 'D', 'M' or 348238104Sdes 'N' of the command line switch. */ 349238104Sdes 350238104Sdesextern char flag_dump_macros; 351238104Sdes 352238104Sdes/* Nonzero means pass #include lines through to the output. */ 353238104Sdes 354238104Sdesextern char flag_dump_includes; 355238104Sdes 356238104Sdes/* Nonzero means process PCH files while preprocessing. */ 357238104Sdes 358238104Sdesextern bool flag_pch_preprocess; 359238104Sdes 360238104Sdes/* The file name to which we should write a precompiled header, or 361238104Sdes NULL if no header will be written in this compile. */ 362238104Sdes 363238104Sdesextern const char *pch_file; 364 365/* Nonzero if an ISO standard was selected. It rejects macros in the 366 user's namespace. */ 367 368extern int flag_iso; 369 370/* Nonzero if -undef was given. It suppresses target built-in macros 371 and assertions. */ 372 373extern int flag_undef; 374 375/* Nonzero means don't recognize the non-ANSI builtin functions. */ 376 377extern int flag_no_builtin; 378 379/* Nonzero means don't recognize the non-ANSI builtin functions. 380 -ansi sets this. */ 381 382extern int flag_no_nonansi_builtin; 383 384/* Nonzero means give `double' the same size as `float'. */ 385 386extern int flag_short_double; 387 388/* Nonzero means give `wchar_t' the same size as `short'. */ 389 390extern int flag_short_wchar; 391 392/* Nonzero means allow Microsoft extensions without warnings or errors. */ 393extern int flag_ms_extensions; 394 395/* Nonzero means don't recognize the keyword `asm'. */ 396 397extern int flag_no_asm; 398 399/* Nonzero means give string constants the type `const char *', as mandated 400 by the standard. */ 401 402extern int flag_const_strings; 403 404/* Nonzero means to treat bitfields as signed unless they say `unsigned'. */ 405 406extern int flag_signed_bitfields; 407 408/* Warn about #pragma directives that are not recognized. */ 409 410extern int warn_unknown_pragmas; /* Tri state variable. */ 411 412/* Warn about format/argument anomalies in calls to formatted I/O functions 413 (*printf, *scanf, strftime, strfmon, etc.). */ 414 415extern int warn_format; 416 417 418/* C/ObjC language option variables. */ 419 420 421/* Nonzero means allow type mismatches in conditional expressions; 422 just make their values `void'. */ 423 424extern int flag_cond_mismatch; 425 426/* Nonzero means enable C89 Amendment 1 features. */ 427 428extern int flag_isoc94; 429 430/* Nonzero means use the ISO C99 dialect of C. */ 431 432extern int flag_isoc99; 433 434/* Nonzero means that we have builtin functions, and main is an int. */ 435 436extern int flag_hosted; 437 438/* Warn if main is suspicious. */ 439 440extern int warn_main; 441 442 443/* ObjC language option variables. */ 444 445 446/* Open and close the file for outputting class declarations, if 447 requested (ObjC). */ 448 449extern int flag_gen_declaration; 450 451/* Tells the compiler that this is a special run. Do not perform any 452 compiling, instead we are to test some platform dependent features 453 and output a C header file with appropriate definitions. */ 454 455extern int print_struct_values; 456 457/* ???. Undocumented. */ 458 459extern const char *constant_string_class_name; 460 461 462/* C++ language option variables. */ 463 464 465/* Nonzero means don't recognize any extension keywords. */ 466 467extern int flag_no_gnu_keywords; 468 469/* Nonzero means do emit exported implementations of functions even if 470 they can be inlined. */ 471 472extern int flag_implement_inlines; 473 474/* Nonzero means that implicit instantiations will be emitted if needed. */ 475 476extern int flag_implicit_templates; 477 478/* Nonzero means that implicit instantiations of inline templates will be 479 emitted if needed, even if instantiations of non-inline templates 480 aren't. */ 481 482extern int flag_implicit_inline_templates; 483 484/* Nonzero means generate separate instantiation control files and 485 juggle them at link time. */ 486 487extern int flag_use_repository; 488 489/* Nonzero if we want to issue diagnostics that the standard says are not 490 required. */ 491 492extern int flag_optional_diags; 493 494/* Nonzero means we should attempt to elide constructors when possible. */ 495 496extern int flag_elide_constructors; 497 498/* Nonzero means that member functions defined in class scope are 499 inline by default. */ 500 501extern int flag_default_inline; 502 503/* Controls whether compiler generates 'type descriptor' that give 504 run-time type information. */ 505 506extern int flag_rtti; 507 508/* Nonzero if we want to conserve space in the .o files. We do this 509 by putting uninitialized data and runtime initialized data into 510 .common instead of .data at the expense of not flagging multiple 511 definitions. */ 512 513extern int flag_conserve_space; 514 515/* Nonzero if we want to obey access control semantics. */ 516 517extern int flag_access_control; 518 519/* Nonzero if we want to check the return value of new and avoid calling 520 constructors if it is a null pointer. */ 521 522extern int flag_check_new; 523 524/* Nonzero if we want the new ISO rules for pushing a new scope for `for' 525 initialization variables. 526 0: Old rules, set by -fno-for-scope. 527 2: New ISO rules, set by -ffor-scope. 528 1: Try to implement new ISO rules, but with backup compatibility 529 (and warnings). This is the default, for now. */ 530 531extern int flag_new_for_scope; 532 533/* Nonzero if we want to emit defined symbols with common-like linkage as 534 weak symbols where possible, in order to conform to C++ semantics. 535 Otherwise, emit them as local symbols. */ 536 537extern int flag_weak; 538 539/* 0 means we want the preprocessor to not emit line directives for 540 the current working directory. 1 means we want it to do it. -1 541 means we should decide depending on whether debugging information 542 is being emitted or not. */ 543 544extern int flag_working_directory; 545 546/* Nonzero to use __cxa_atexit, rather than atexit, to register 547 destructors for local statics and global objects. */ 548 549extern int flag_use_cxa_atexit; 550 551/* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling 552 logic. */ 553 554extern int flag_use_cxa_get_exception_ptr; 555 556/* Nonzero means make the default pedwarns warnings instead of errors. 557 The value of this flag is ignored if -pedantic is specified. */ 558 559extern int flag_permissive; 560 561/* Nonzero means to implement standard semantics for exception 562 specifications, calling unexpected if an exception is thrown that 563 doesn't match the specification. Zero means to treat them as 564 assertions and optimize accordingly, but not check them. */ 565 566extern int flag_enforce_eh_specs; 567 568/* Nonzero (the default) means to generate thread-safe code for 569 initializing local statics. */ 570 571extern int flag_threadsafe_statics; 572 573/* Nonzero means warn about implicit declarations. */ 574 575extern int warn_implicit; 576 577/* Warn about using __null (as NULL in C++) as sentinel. For code compiled 578 with GCC this doesn't matter as __null is guaranteed to have the right 579 size. */ 580 581extern int warn_strict_null_sentinel; 582 583/* Maximum template instantiation depth. This limit is rather 584 arbitrary, but it exists to limit the time it takes to notice 585 infinite template instantiations. */ 586 587extern int max_tinst_depth; 588 589/* Nonzero means the expression being parsed will never be evaluated. 590 This is a count, since unevaluated expressions can nest. */ 591 592extern int skip_evaluation; 593 594/* C types are partitioned into three subsets: object, function, and 595 incomplete types. */ 596#define C_TYPE_OBJECT_P(type) \ 597 (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type)) 598 599#define C_TYPE_INCOMPLETE_P(type) \ 600 (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0) 601 602#define C_TYPE_FUNCTION_P(type) \ 603 (TREE_CODE (type) == FUNCTION_TYPE) 604 605/* For convenience we define a single macro to identify the class of 606 object or incomplete types. */ 607#define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \ 608 (!C_TYPE_FUNCTION_P (type)) 609 610/* Attribute table common to the C front ends. */ 611extern const struct attribute_spec c_common_attribute_table[]; 612extern const struct attribute_spec c_common_format_attribute_table[]; 613 614/* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc. 615 ID is the identifier to use, NAME is the string. 616 TYPE_DEP indicates whether it depends on type of the function or not 617 (i.e. __PRETTY_FUNCTION__). */ 618 619extern tree (*make_fname_decl) (tree, int); 620 621extern tree identifier_global_value (tree); 622extern void record_builtin_type (enum rid, const char *, tree); 623extern tree build_void_list_node (void); 624extern void start_fname_decls (void); 625extern void finish_fname_decls (void); 626extern const char *fname_as_string (int); 627extern tree fname_decl (unsigned, tree); 628 629extern void check_function_arguments (tree, tree, tree); 630extern void check_function_arguments_recurse (void (*) 631 (void *, tree, 632 unsigned HOST_WIDE_INT), 633 void *, tree, 634 unsigned HOST_WIDE_INT); 635extern void check_function_format (tree, tree); 636extern void set_Wformat (int); 637extern tree handle_format_attribute (tree *, tree, tree, int, bool *); 638extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *); 639extern int c_common_handle_option (size_t code, const char *arg, int value); 640extern bool c_common_missing_argument (const char *opt, size_t code); 641extern tree c_common_type_for_mode (enum machine_mode, int); 642extern tree c_common_type_for_size (unsigned int, int); 643extern tree c_common_unsigned_type (tree); 644extern tree c_common_signed_type (tree); 645extern tree c_common_signed_or_unsigned_type (int, tree); 646extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int); 647extern tree c_common_truthvalue_conversion (tree); 648extern void c_apply_type_quals_to_decl (int, tree); 649extern tree c_sizeof_or_alignof_type (tree, bool, int); 650extern tree c_alignof_expr (tree); 651/* Print an error message for invalid operands to arith operation CODE. 652 NOP_EXPR is used as a special case (see truthvalue_conversion). */ 653extern void binary_op_error (enum tree_code); 654extern tree fix_string_type (tree); 655struct varray_head_tag; 656extern void constant_expression_warning (tree); 657extern bool strict_aliasing_warning (tree, tree, tree); 658extern void empty_body_warning (tree, tree); 659extern tree convert_and_check (tree, tree); 660extern void overflow_warning (tree); 661extern bool c_determine_visibility (tree); 662extern bool same_scalar_type_ignoring_signedness (tree, tree); 663 664#define c_sizeof(T) c_sizeof_or_alignof_type (T, true, 1) 665#define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1) 666 667/* Subroutine of build_binary_op, used for comparison operations. 668 See if the operands have both been converted from subword integer types 669 and, if so, perhaps change them both back to their original type. */ 670extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *); 671 672extern tree pointer_int_sum (enum tree_code, tree, tree); 673extern unsigned int min_precision (tree, int); 674 675/* Add qualifiers to a type, in the fashion for C. */ 676extern tree c_build_qualified_type (tree, int); 677 678/* Build tree nodes and builtin functions common to both C and C++ language 679 frontends. */ 680extern void c_common_nodes_and_builtins (void); 681 682extern void set_builtin_user_assembler_name (tree decl, const char *asmspec); 683 684extern void disable_builtin_function (const char *); 685 686extern void set_compound_literal_name (tree decl); 687 688extern tree build_va_arg (tree, tree); 689 690extern unsigned int c_common_init_options (unsigned int, const char **); 691extern bool c_common_post_options (const char **); 692extern bool c_common_init (void); 693extern void c_common_finish (void); 694extern void c_common_parse_file (int); 695extern HOST_WIDE_INT c_common_get_alias_set (tree); 696extern void c_register_builtin_type (tree, const char*); 697extern bool c_promoting_integer_type_p (tree); 698extern int self_promoting_args_p (tree); 699extern tree strip_array_types (tree); 700extern tree strip_pointer_operator (tree); 701extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT); 702 703/* This is the basic parsing function. */ 704extern void c_parse_file (void); 705/* This is misnamed, it actually performs end-of-compilation processing. */ 706extern void finish_file (void); 707 708 709/* These macros provide convenient access to the various _STMT nodes. */ 710 711/* Nonzero if a given STATEMENT_LIST represents the outermost binding 712 if a statement expression. */ 713#define STATEMENT_LIST_STMT_EXPR(NODE) \ 714 TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE)) 715 716/* Nonzero if a label has been added to the statement list. */ 717#define STATEMENT_LIST_HAS_LABEL(NODE) \ 718 TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE)) 719 720/* COMPOUND_LITERAL_EXPR accessors. */ 721#define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE) \ 722 TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0) 723#define COMPOUND_LITERAL_EXPR_DECL(NODE) \ 724 DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE)) 725 726#define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM, 727 728enum c_tree_code { 729 C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE, 730#include "c-common.def" 731 LAST_C_TREE_CODE 732}; 733 734#undef DEFTREECODE 735 736extern int anon_aggr_type_p (tree); 737 738/* For a VAR_DECL that is an anonymous union, these are the various 739 sub-variables that make up the anonymous union. */ 740#define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE)) 741 742/* In a FIELD_DECL, nonzero if the decl was originally a bitfield. */ 743#define DECL_C_BIT_FIELD(NODE) \ 744 (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1) 745#define SET_DECL_C_BIT_FIELD(NODE) \ 746 (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1) 747#define CLEAR_DECL_C_BIT_FIELD(NODE) \ 748 (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0) 749 750extern void emit_local_var (tree); 751extern tree do_case (tree, tree); 752extern tree build_stmt (enum tree_code, ...); 753extern tree build_case_label (tree, tree, tree); 754 755/* These functions must be defined by each front-end which implements 756 a variant of the C language. They are used in c-common.c. */ 757 758extern tree build_unary_op (enum tree_code, tree, int); 759extern tree build_binary_op (enum tree_code, tree, tree, int); 760extern tree perform_integral_promotions (tree); 761 762/* These functions must be defined by each front-end which implements 763 a variant of the C language. They are used by port files. */ 764 765extern tree default_conversion (tree); 766 767/* Given two integer or real types, return the type for their sum. 768 Given two compatible ANSI C types, returns the merged type. */ 769 770extern tree common_type (tree, tree); 771 772extern tree decl_constant_value (tree); 773 774/* Handle increment and decrement of boolean types. */ 775extern tree boolean_increment (enum tree_code, tree); 776 777extern int case_compare (splay_tree_key, splay_tree_key); 778 779extern tree c_add_case_label (splay_tree, tree, tree, tree, tree); 780 781extern void c_do_switch_warnings (splay_tree, location_t, tree, tree); 782 783extern tree build_function_call (tree, tree); 784 785extern tree resolve_overloaded_builtin (tree, tree); 786 787extern tree finish_label_address_expr (tree); 788 789/* Same function prototype, but the C and C++ front ends have 790 different implementations. Used in c-common.c. */ 791extern tree lookup_label (tree); 792extern tree lookup_name (tree); 793 794extern int vector_types_convertible_p (tree t1, tree t2); 795 796extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *); 797 798extern tree c_staticp (tree); 799 800extern void init_c_lex (void); 801 802extern void c_cpp_builtins (cpp_reader *); 803 804/* Positive if an implicit `extern "C"' scope has just been entered; 805 negative if such a scope has just been exited. */ 806extern GTY(()) int pending_lang_change; 807 808/* Information recorded about each file examined during compilation. */ 809 810struct c_fileinfo 811{ 812 int time; /* Time spent in the file. */ 813 814 /* Flags used only by C++. 815 INTERFACE_ONLY nonzero means that we are in an "interface" section 816 of the compiler. INTERFACE_UNKNOWN nonzero means we cannot trust 817 the value of INTERFACE_ONLY. If INTERFACE_UNKNOWN is zero and 818 INTERFACE_ONLY is zero, it means that we are responsible for 819 exporting definitions that others might need. */ 820 short interface_only; 821 short interface_unknown; 822}; 823 824struct c_fileinfo *get_fileinfo (const char *); 825extern void dump_time_statistics (void); 826 827extern bool c_dump_tree (void *, tree); 828 829extern void c_warn_unused_result (tree *); 830 831extern void verify_sequence_points (tree); 832 833extern tree fold_offsetof (tree, tree); 834 835/* Places where an lvalue, or modifiable lvalue, may be required. 836 Used to select diagnostic messages in lvalue_error and 837 readonly_error. */ 838enum lvalue_use { 839 lv_assign, 840 lv_increment, 841 lv_decrement, 842 lv_addressof, 843 lv_asm 844}; 845 846extern void lvalue_error (enum lvalue_use); 847 848extern int complete_array_type (tree *, tree, bool); 849 850extern tree builtin_type_for_size (int, bool); 851 852extern void warn_array_subscript_with_type_char (tree); 853extern void warn_about_parentheses (enum tree_code, enum tree_code, 854 enum tree_code); 855 856 857/* In c-gimplify.c */ 858extern void c_genericize (tree); 859extern int c_gimplify_expr (tree *, tree *, tree *); 860extern tree c_build_bind_expr (tree, tree); 861 862/* In c-pch.c */ 863extern void pch_init (void); 864extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd); 865extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd, 866 const char *orig); 867extern void c_common_write_pch (void); 868extern void c_common_no_more_pch (void); 869extern void c_common_pch_pragma (cpp_reader *pfile, const char *); 870extern void c_common_print_pch_checksum (FILE *f); 871 872/* In *-checksum.c */ 873extern const unsigned char executable_checksum[16]; 874 875extern void builtin_define_with_value (const char *, const char *, int); 876extern void c_stddef_cpp_builtins (void); 877extern void fe_file_change (const struct line_map *); 878extern void c_parse_error (const char *, enum cpp_ttype, tree); 879 880/* Objective-C / Objective-C++ entry points. */ 881 882/* The following ObjC/ObjC++ functions are called by the C and/or C++ 883 front-ends; they all must have corresponding stubs in stub-objc.c. */ 884extern tree objc_is_class_name (tree); 885extern tree objc_is_object_ptr (tree); 886extern void objc_check_decl (tree); 887extern int objc_is_reserved_word (tree); 888extern bool objc_compare_types (tree, tree, int, tree); 889extern void objc_volatilize_decl (tree); 890extern bool objc_type_quals_match (tree, tree); 891extern tree objc_rewrite_function_call (tree, tree); 892extern tree objc_message_selector (void); 893extern tree objc_lookup_ivar (tree, tree); 894extern void objc_clear_super_receiver (void); 895extern int objc_is_public (tree, tree); 896extern tree objc_is_id (tree); 897extern void objc_declare_alias (tree, tree); 898extern void objc_declare_class (tree); 899extern void objc_declare_protocols (tree); 900extern tree objc_build_message_expr (tree); 901extern tree objc_finish_message_expr (tree, tree, tree); 902extern tree objc_build_selector_expr (tree); 903extern tree objc_build_protocol_expr (tree); 904extern tree objc_build_encode_expr (tree); 905extern tree objc_build_string_object (tree); 906extern tree objc_get_protocol_qualified_type (tree, tree); 907extern tree objc_get_class_reference (tree); 908extern tree objc_get_class_ivars (tree); 909extern void objc_start_class_interface (tree, tree, tree); 910extern void objc_start_category_interface (tree, tree, tree); 911extern void objc_start_protocol (tree, tree); 912extern void objc_continue_interface (void); 913extern void objc_finish_interface (void); 914extern void objc_start_class_implementation (tree, tree); 915extern void objc_start_category_implementation (tree, tree); 916extern void objc_continue_implementation (void); 917extern void objc_finish_implementation (void); 918extern void objc_set_visibility (int); 919extern void objc_set_method_type (enum tree_code); 920extern tree objc_build_method_signature (tree, tree, tree, bool); 921extern void objc_add_method_declaration (tree); 922extern void objc_start_method_definition (tree); 923extern void objc_finish_method_definition (tree); 924extern void objc_add_instance_variable (tree); 925extern tree objc_build_keyword_decl (tree, tree, tree); 926extern tree objc_build_throw_stmt (tree); 927extern void objc_begin_try_stmt (location_t, tree); 928extern tree objc_finish_try_stmt (void); 929extern void objc_begin_catch_clause (tree); 930extern void objc_finish_catch_clause (void); 931extern void objc_build_finally_clause (location_t, tree); 932extern tree objc_build_synchronized (location_t, tree, tree); 933extern int objc_static_init_needed_p (void); 934extern tree objc_generate_static_init_call (tree); 935extern tree objc_generate_write_barrier (tree, enum tree_code, tree); 936 937/* The following are provided by the C and C++ front-ends, and called by 938 ObjC/ObjC++. */ 939extern void *objc_get_current_scope (void); 940extern void objc_mark_locals_volatile (void *); 941 942/* In c-ppoutput.c */ 943extern void init_pp_output (FILE *); 944extern void preprocess_file (cpp_reader *); 945extern void pp_file_change (const struct line_map *); 946extern void pp_dir_change (cpp_reader *, const char *); 947extern bool check_missing_format_attribute (tree, tree); 948 949/* In c-omp.c */ 950extern tree c_finish_omp_master (tree); 951extern tree c_finish_omp_critical (tree, tree); 952extern tree c_finish_omp_ordered (tree); 953extern void c_finish_omp_barrier (void); 954extern tree c_finish_omp_atomic (enum tree_code, tree, tree); 955extern void c_finish_omp_flush (void); 956extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree); 957extern void c_split_parallel_clauses (tree, tree *, tree *); 958extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree); 959 960/* Not in c-omp.c; provided by the front end. */ 961extern bool c_omp_sharing_predetermined (tree); 962extern tree c_omp_remap_decl (tree, bool); 963 964/* In order for the format checking to accept the C frontend 965 diagnostic framework extensions, you must include this file before 966 toplev.h, not after. The C front end formats are a subset of those 967 for C++, so they are the appropriate set to use in common code; 968 cp-tree.h overrides this for C++. */ 969#ifndef GCC_DIAG_STYLE 970#define GCC_DIAG_STYLE __gcc_cdiag__ 971#endif 972 973#endif /* ! GCC_C_COMMON_H */ 974