c-tree.h revision 52300
1/* Definitions for C parsing and type checking. 2 Copyright (C) 1987, 93, 94, 95, 97, 98, 1999 Free Software Foundation, Inc. 3 4This file is part of GNU CC. 5 6GNU CC is free software; you can redistribute it and/or modify 7it under the terms of the GNU General Public License as published by 8the Free Software Foundation; either version 2, or (at your option) 9any later version. 10 11GNU CC is distributed in the hope that it will be useful, 12but WITHOUT ANY WARRANTY; without even the implied warranty of 13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14GNU General Public License for more details. 15 16You should have received a copy of the GNU General Public License 17along with GNU CC; see the file COPYING. If not, write to 18the Free Software Foundation, 59 Temple Place - Suite 330, 19Boston, MA 02111-1307, USA. */ 20 21/* $FreeBSD: head/contrib/gcc/c-tree.h 52300 1999-10-16 08:34:33Z obrien $ */ 22 23#ifndef _C_TREE_H 24#define _C_TREE_H 25 26/* Language-dependent contents of an identifier. */ 27 28/* The limbo_value is used for block level extern declarations, which need 29 to be type checked against subsequent extern declarations. They can't 30 be referenced after they fall out of scope, so they can't be global. */ 31 32struct lang_identifier 33{ 34 struct tree_identifier ignore; 35 tree global_value, local_value, label_value, implicit_decl; 36 tree error_locus, limbo_value; 37}; 38 39/* Macros for access to language-specific slots in an identifier. */ 40/* Each of these slots contains a DECL node or null. */ 41 42/* This represents the value which the identifier has in the 43 file-scope namespace. */ 44#define IDENTIFIER_GLOBAL_VALUE(NODE) \ 45 (((struct lang_identifier *) (NODE))->global_value) 46/* This represents the value which the identifier has in the current 47 scope. */ 48#define IDENTIFIER_LOCAL_VALUE(NODE) \ 49 (((struct lang_identifier *) (NODE))->local_value) 50/* This represents the value which the identifier has as a label in 51 the current label scope. */ 52#define IDENTIFIER_LABEL_VALUE(NODE) \ 53 (((struct lang_identifier *) (NODE))->label_value) 54/* This records the extern decl of this identifier, if it has had one 55 at any point in this compilation. */ 56#define IDENTIFIER_LIMBO_VALUE(NODE) \ 57 (((struct lang_identifier *) (NODE))->limbo_value) 58/* This records the implicit function decl of this identifier, if it 59 has had one at any point in this compilation. */ 60#define IDENTIFIER_IMPLICIT_DECL(NODE) \ 61 (((struct lang_identifier *) (NODE))->implicit_decl) 62/* This is the last function in which we printed an "undefined variable" 63 message for this identifier. Value is a FUNCTION_DECL or null. */ 64#define IDENTIFIER_ERROR_LOCUS(NODE) \ 65 (((struct lang_identifier *) (NODE))->error_locus) 66 67/* In identifiers, C uses the following fields in a special way: 68 TREE_PUBLIC to record that there was a previous local extern decl. 69 TREE_USED to record that such a decl was used. 70 TREE_ADDRESSABLE to record that the address of such a decl was used. */ 71 72/* Nonzero means reject anything that ANSI standard C forbids. */ 73extern int pedantic; 74 75/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */ 76#define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type) 77 78/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */ 79#define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type) 80 81/* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE 82 nonzero if the definition of the type has already started. */ 83#define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type) 84 85/* C types are partitioned into three subsets: object, function, and 86 incomplete types. */ 87#define C_TYPE_OBJECT_P(type) \ 88 (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type)) 89 90#define C_TYPE_FUNCTION_P(type) \ 91 (TREE_CODE (type) == FUNCTION_TYPE) 92 93#define C_TYPE_INCOMPLETE_P(type) \ 94 (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0) 95 96/* For convenience we define a single macro to identify the class of 97 object or incomplete types. */ 98#define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \ 99 (!C_TYPE_FUNCTION_P (type)) 100 101/* In a RECORD_TYPE, a sorted array of the fields of the type. */ 102struct lang_type 103{ 104 int len; 105 tree elts[1]; 106}; 107 108/* Mark which labels are explicitly declared. 109 These may be shadowed, and may be referenced from nested functions. */ 110#define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label) 111 112/* Record whether a type or decl was written with nonconstant size. 113 Note that TYPE_SIZE may have simplified to a constant. */ 114#define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type) 115#define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type) 116 117/* Record in each node resulting from a binary operator 118 what operator was specified for it. */ 119#define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp)) 120 121#if 0 /* Not used. */ 122/* Record whether a decl for a function or function pointer has 123 already been mentioned (in a warning) because it was called 124 but didn't have a prototype. */ 125#define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl) 126#endif 127 128/* Store a value in that field. */ 129#define C_SET_EXP_ORIGINAL_CODE(exp, code) \ 130 (TREE_COMPLEXITY (exp) = (int) (code)) 131 132/* Record whether a typedef for type `int' was actually `signed int'. */ 133#define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp)) 134 135/* Nonzero for a declaration of a built in function if there has been no 136 occasion that would declare the function in ordinary C. 137 Using the function draws a pedantic warning in this case. */ 138#define C_DECL_ANTICIPATED(exp) DECL_LANG_FLAG_3 ((exp)) 139 140/* For FUNCTION_TYPE, a hidden list of types of arguments. The same as 141 TYPE_ARG_TYPES for functions with prototypes, but created for functions 142 without prototypes. */ 143#define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE) 144 145/* In a FIELD_DECL, nonzero if the decl was originally a bitfield. */ 146#define DECL_C_BIT_FIELD(NODE) DECL_LANG_FLAG_4 (NODE) 147 148/* Nonzero if the type T promotes to itself. 149 ANSI C states explicitly the list of types that promote; 150 in particular, short promotes to int even if they have the same width. */ 151#define C_PROMOTING_INTEGER_TYPE_P(t) \ 152 (TREE_CODE ((t)) == INTEGER_TYPE \ 153 && (TYPE_MAIN_VARIANT (t) == char_type_node \ 154 || TYPE_MAIN_VARIANT (t) == signed_char_type_node \ 155 || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node \ 156 || TYPE_MAIN_VARIANT (t) == short_integer_type_node \ 157 || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node)) 158 159/* In a VAR_DECL, means the variable is really an iterator. */ 160#define ITERATOR_P(D) (DECL_LANG_FLAG_4(D)) 161 162/* In a VAR_DECL for an iterator, means we are within 163 an explicit loop over that iterator. */ 164#define ITERATOR_BOUND_P(NODE) ((NODE)->common.readonly_flag) 165 166/* in c-lang.c and objc-act.c */ 167extern tree lookup_interface PROTO((tree)); 168extern tree is_class_name PROTO((tree)); 169extern void maybe_objc_check_decl PROTO((tree)); 170extern void finish_file PROTO((void)); 171extern int maybe_objc_comptypes PROTO((tree, tree, int)); 172extern tree maybe_building_objc_message_expr PROTO((void)); 173extern tree maybe_objc_method_name PROTO((tree)); 174extern int recognize_objc_keyword PROTO((void)); 175extern tree build_objc_string PROTO((int, const char *)); 176 177/* in c-aux-info.c */ 178extern void gen_aux_info_record PROTO((tree, int, int, int)); 179 180/* in c-common.c */ 181extern void declare_function_name PROTO((void)); 182extern void decl_attributes PROTO((tree, tree, tree)); 183extern void init_function_format_info PROTO((void)); 184extern void check_function_format PROTO((tree, tree, tree)); 185extern int c_get_alias_set PROTO((tree)); 186extern void c_apply_type_quals_to_decl PROTO((int, tree)); 187/* Print an error message for invalid operands to arith operation CODE. 188 NOP_EXPR is used as a special case (see truthvalue_conversion). */ 189extern void binary_op_error PROTO((enum tree_code)); 190extern void c_expand_expr_stmt PROTO((tree)); 191extern void c_expand_start_cond PROTO((tree, int, int)); 192extern void c_expand_start_else PROTO((void)); 193extern void c_expand_end_cond PROTO((void)); 194/* Validate the expression after `case' and apply default promotions. */ 195extern tree check_case_value PROTO((tree)); 196/* Concatenate a list of STRING_CST nodes into one STRING_CST. */ 197extern tree combine_strings PROTO((tree)); 198extern void constant_expression_warning PROTO((tree)); 199extern tree convert_and_check PROTO((tree, tree)); 200extern void overflow_warning PROTO((tree)); 201extern void unsigned_conversion_warning PROTO((tree, tree)); 202/* Read the rest of the current #-directive line. */ 203#if USE_CPPLIB 204extern char *get_directive_line PROTO((void)); 205#define GET_DIRECTIVE_LINE() get_directive_line () 206#else 207extern char *get_directive_line PROTO((FILE *)); 208#define GET_DIRECTIVE_LINE() get_directive_line (finput) 209#endif 210 211/* Subroutine of build_binary_op, used for comparison operations. 212 See if the operands have both been converted from subword integer types 213 and, if so, perhaps change them both back to their original type. */ 214extern tree shorten_compare PROTO((tree *, tree *, tree *, enum tree_code *)); 215/* Prepare expr to be an argument of a TRUTH_NOT_EXPR, 216 or validate its data type for an `if' or `while' statement or ?..: exp. */ 217extern tree truthvalue_conversion PROTO((tree)); 218extern tree type_for_mode PROTO((enum machine_mode, int)); 219extern tree type_for_size PROTO((unsigned, int)); 220 221/* in c-convert.c */ 222extern tree convert PROTO((tree, tree)); 223 224/* in c-decl.c */ 225/* Standard named or nameless data types of the C compiler. */ 226extern tree char_array_type_node; 227extern tree char_type_node; 228extern tree const_ptr_type_node; 229extern tree const_string_type_node; 230extern tree default_function_type; 231extern tree double_ftype_double; 232extern tree double_ftype_double_double; 233extern tree double_type_node; 234extern tree float_type_node; 235#if HOST_BITS_PER_WIDE_INT >= 64 236extern tree intTI_type_node; 237#endif 238extern tree intDI_type_node; 239extern tree intHI_type_node; 240extern tree intQI_type_node; 241extern tree intSI_type_node; 242extern tree int_array_type_node; 243extern tree int_ftype_cptr_cptr_sizet; 244extern tree int_ftype_int; 245extern tree int_ftype_ptr_ptr_int; 246extern tree int_ftype_string_string; 247extern tree integer_type_node; 248extern tree long_double_type_node; 249extern tree long_ftype_long; 250extern tree long_integer_type_node; 251extern tree long_long_integer_type_node; 252extern tree long_long_unsigned_type_node; 253extern tree long_unsigned_type_node; 254extern tree complex_integer_type_node; 255extern tree complex_float_type_node; 256extern tree complex_double_type_node; 257extern tree complex_long_double_type_node; 258extern tree ptr_type_node; 259extern tree ptrdiff_type_node; 260extern tree short_integer_type_node; 261extern tree short_unsigned_type_node; 262extern tree signed_char_type_node; 263extern tree signed_wchar_type_node; 264extern tree string_ftype_ptr_ptr; 265extern tree string_type_node; 266extern tree unsigned_char_type_node; 267#if HOST_BITS_PER_WIDE_INT >= 64 268extern tree unsigned_intTI_type_node; 269#endif 270extern tree unsigned_intDI_type_node; 271extern tree unsigned_intHI_type_node; 272extern tree unsigned_intQI_type_node; 273extern tree unsigned_intSI_type_node; 274extern tree unsigned_type_node; 275extern tree unsigned_wchar_type_node; 276extern tree void_ftype_ptr_int_int; 277extern tree void_ftype_ptr_ptr_int; 278extern tree void_type_node; 279extern tree wchar_array_type_node; 280extern tree wchar_type_node; 281extern tree boolean_type_node; 282extern tree boolean_true_node; 283extern tree boolean_false_node; 284 285extern tree build_enumerator PROTO((tree, tree)); 286/* Declare a predefined function. Return the declaration. */ 287extern tree builtin_function PROTO((const char *, tree, enum built_in_function function_, const char *)); 288/* Add qualifiers to a type, in the fashion for C. */ 289extern tree c_build_qualified_type PROTO((tree, int)); 290#define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \ 291 c_build_qualified_type (TYPE, \ 292 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \ 293 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0)) 294extern int c_decode_option PROTO((int, char **)); 295extern void c_mark_varargs PROTO((void)); 296extern tree check_identifier PROTO((tree, tree)); 297extern void clear_parm_order PROTO((void)); 298extern tree combine_parm_decls PROTO((tree, tree, int)); 299extern int complete_array_type PROTO((tree, tree, int)); 300extern void declare_parm_level PROTO((int)); 301extern tree define_label PROTO((char *, int, tree)); 302extern void delete_block PROTO((tree)); 303extern void finish_decl PROTO((tree, tree, tree)); 304extern void finish_decl_top_level PROTO((tree, tree, tree)); 305extern tree finish_enum PROTO((tree, tree, tree)); 306extern void finish_function PROTO((int)); 307extern tree finish_struct PROTO((tree, tree, tree)); 308extern tree get_parm_info PROTO((int)); 309extern tree getdecls PROTO((void)); 310extern tree gettags PROTO((void)); 311extern int global_bindings_p PROTO((void)); 312extern tree grokfield PROTO((const char *, int, tree, tree, tree)); 313extern tree groktypename PROTO((tree)); 314extern tree groktypename_in_parm_context PROTO((tree)); 315extern tree implicitly_declare PROTO((tree)); 316extern int in_parm_level_p PROTO((void)); 317extern void init_decl_processing PROTO((void)); 318extern void insert_block PROTO((tree)); 319extern void keep_next_level PROTO((void)); 320extern int kept_level_p PROTO((void)); 321extern tree lookup_label PROTO((tree)); 322extern tree lookup_name PROTO((tree)); 323extern tree lookup_name_current_level PROTO((tree)); 324extern tree lookup_name_current_level_global PROTO((tree)); 325extern tree maybe_build_cleanup PROTO((tree)); 326extern void parmlist_tags_warning PROTO((void)); 327extern void pending_xref_error PROTO((void)); 328extern void pop_c_function_context PROTO((void)); 329extern void pop_label_level PROTO((void)); 330extern tree poplevel PROTO((int, int, int)); 331extern void print_lang_decl PROTO((FILE *, tree, int)); 332extern void print_lang_identifier PROTO((FILE *, tree, int)); 333extern void print_lang_type PROTO((FILE *, tree, int)); 334extern void push_c_function_context PROTO((void)); 335extern void push_label_level PROTO((void)); 336extern void push_parm_decl PROTO((tree)); 337extern tree pushdecl PROTO((tree)); 338extern tree pushdecl_top_level PROTO((tree)); 339extern void pushlevel PROTO((int)); 340extern void pushtag PROTO((tree, tree)); 341extern void set_block PROTO((tree)); 342extern tree shadow_label PROTO((tree)); 343extern void shadow_record_fields PROTO((tree)); 344extern void shadow_tag PROTO((tree)); 345extern void shadow_tag_warned PROTO((tree, int)); 346extern tree start_enum PROTO((tree)); 347extern int start_function PROTO((tree, tree, tree, 348 tree, int)); 349extern tree start_decl PROTO((tree, tree, int, 350 tree, tree)); 351extern tree start_struct PROTO((enum tree_code, tree)); 352extern void store_parm_decls PROTO((void)); 353extern tree xref_tag PROTO((enum tree_code, tree)); 354 355/* in c-typeck.c */ 356extern tree require_complete_type PROTO((tree)); 357extern void incomplete_type_error PROTO((tree, tree)); 358/* Given two integer or real types, return the type for their sum. 359 Given two compatible ANSI C types, returns the merged type. */ 360extern tree common_type PROTO((tree, tree)); 361extern int comptypes PROTO((tree, tree)); 362extern int self_promoting_args_p PROTO((tree)); 363extern tree c_sizeof PROTO((tree)); 364extern tree c_sizeof_nowarn PROTO((tree)); 365extern tree c_size_in_bytes PROTO((tree)); 366extern tree c_alignof PROTO((tree)); 367extern tree c_alignof_expr PROTO((tree)); 368extern tree default_conversion PROTO((tree)); 369extern tree build_component_ref PROTO((tree, tree)); 370extern tree build_indirect_ref PROTO((tree, const char *)); 371extern tree build_array_ref PROTO((tree, tree)); 372extern tree build_function_call PROTO((tree, tree)); 373extern tree parser_build_binary_op PROTO((enum tree_code, 374 tree, tree)); 375extern tree build_binary_op PROTO((enum tree_code, 376 tree, tree, int)); 377extern tree build_unary_op PROTO((enum tree_code, 378 tree, int)); 379extern int lvalue_p PROTO((tree)); 380extern int lvalue_or_else PROTO((tree, const char *)); 381extern void readonly_warning PROTO((tree, const char *)); 382extern int mark_addressable PROTO((tree)); 383extern tree build_conditional_expr PROTO((tree, tree, tree)); 384extern tree build_compound_expr PROTO((tree)); 385extern tree build_c_cast PROTO((tree, tree)); 386extern tree build_modify_expr PROTO((tree, enum tree_code, 387 tree)); 388extern tree initializer_constant_valid_p PROTO((tree, tree)); 389extern void store_init_value PROTO((tree, tree)); 390extern void error_init PROTO((const char *)); 391extern void pedwarn_init PROTO((const char *)); 392extern void start_init PROTO((tree, tree, int)); 393extern void finish_init PROTO((void)); 394extern void really_start_incremental_init PROTO((tree)); 395extern void push_init_level PROTO((int)); 396extern tree pop_init_level PROTO((int)); 397extern void set_init_index PROTO((tree, tree)); 398extern void set_init_label PROTO((tree)); 399extern void process_init_element PROTO((tree)); 400extern void c_expand_asm_operands PROTO((tree, tree, tree, tree, 401 int, char *, int)); 402extern void c_expand_return PROTO((tree)); 403extern tree c_expand_start_case PROTO((tree)); 404 405/* in c-iterate.c */ 406extern void init_iterators PROTO((void)); 407extern void iterator_expand PROTO((tree)); 408extern void iterator_for_loop_start PROTO((tree)); 409extern void iterator_for_loop_end PROTO((tree)); 410extern void iterator_for_loop_record PROTO((tree)); 411extern void push_iterator_stack PROTO((void)); 412extern void pop_iterator_stack PROTO((void)); 413 414/* Set to 0 at beginning of a function definition, set to 1 if 415 a return statement that specifies a return value is seen. */ 416 417extern int current_function_returns_value; 418 419/* Set to 0 at beginning of a function definition, set to 1 if 420 a return statement with no argument is seen. */ 421 422extern int current_function_returns_null; 423 424/* Nonzero means the expression being parsed will never be evaluated. 425 This is a count, since unevaluated expressions can nest. */ 426 427extern int skip_evaluation; 428 429/* Nonzero means `$' can be in an identifier. */ 430 431extern int dollars_in_ident; 432 433/* Nonzero means allow type mismatches in conditional expressions; 434 just make their values `void'. */ 435 436extern int flag_cond_mismatch; 437 438/* Nonzero means don't recognize the keyword `asm'. */ 439 440extern int flag_no_asm; 441 442/* Nonzero means environment is hosted (i.e., not freestanding) */ 443 444extern int flag_hosted; 445 446/* Nonzero means warn about implicit declarations. */ 447 448extern int warn_implicit; 449 450/* Nonzero means give string constants the type `const char *' 451 to get extra warnings from them. These warnings will be too numerous 452 to be useful, except in thoroughly ANSIfied programs. */ 453 454extern int flag_const_strings; 455 456/* Nonzero means warn about sizeof (function) or addition/subtraction 457 of function pointers. */ 458 459extern int warn_pointer_arith; 460 461/* Nonzero means warn for all old-style non-prototype function decls. */ 462 463extern int warn_strict_prototypes; 464 465/* Nonzero means warn about multiple (redundant) decls for the same single 466 variable or function. */ 467 468extern int warn_redundant_decls; 469 470/* Nonzero means warn about extern declarations of objects not at 471 file-scope level and about *all* declarations of functions (whether 472 extern or static) not at file-scope level. Note that we exclude 473 implicit function declarations. To get warnings about those, use 474 -Wimplicit. */ 475 476extern int warn_nested_externs; 477 478/* Nonzero means warn about pointer casts that can drop a type qualifier 479 from the pointer target type. */ 480 481extern int warn_cast_qual; 482 483/* Nonzero means warn when casting a function call to a type that does 484 not match the return type (e.g. (float)sqrt() or (anything*)malloc() 485 when there is no previous declaration of sqrt or malloc. */ 486 487extern int warn_bad_function_cast; 488 489/* Warn about functions which might be candidates for attribute noreturn. */ 490 491extern int warn_missing_noreturn; 492 493/* Warn about traditional constructs whose meanings changed in ANSI C. */ 494 495extern int warn_traditional; 496 497/* Warn about *printf or *scanf format/argument anomalies. */ 498 499extern int warn_format; 500 501/* Warn about a subscript that has type char. */ 502 503extern int warn_char_subscripts; 504 505/* Warn if a type conversion is done that might have confusing results. */ 506 507extern int warn_conversion; 508 509/* Warn if main is suspicious. */ 510 511extern int warn_main; 512 513/* Nonzero means do some things the same way PCC does. */ 514 515extern int flag_traditional; 516 517/* Nonzero means use the ISO C9x dialect of C. */ 518 519extern int flag_isoc9x; 520 521/* Nonzero means to allow single precision math even if we're generally 522 being traditional. */ 523extern int flag_allow_single_precision; 524 525/* Nonzero means warn about suggesting putting in ()'s. */ 526 527extern int warn_parentheses; 528 529/* Warn if initializer is not completely bracketed. */ 530 531extern int warn_missing_braces; 532 533/* Warn about comparison of signed and unsigned values. */ 534 535extern int warn_sign_compare; 536 537/* Warn about multicharacter constants. */ 538 539extern int warn_multichar; 540 541/* Warn about long long. */ 542 543extern int warn_long_long; 544 545/* Nonzero means we are reading code that came from a system header file. */ 546 547extern int system_header_p; 548 549/* Nonzero enables objc features. */ 550 551extern int doing_objc_thang; 552 553/* In c-decl.c */ 554extern void finish_incomplete_decl PROTO((tree)); 555 556#endif /* not _C_TREE_H */ 557