c-tree.h revision 90083
1169695Skan/* Definitions for C parsing and type checking. 2169695Skan Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998, 3169695Skan 1999, 2000, 2001, 2002 Free Software Foundation, Inc. 4169695Skan 5169695SkanThis file is part of GCC. 6169695Skan 7169695SkanGCC is free software; you can redistribute it and/or modify it under 8169695Skanthe terms of the GNU General Public License as published by the Free 9169695SkanSoftware Foundation; either version 2, or (at your option) any later 10169695Skanversion. 11169695Skan 12169695SkanGCC is distributed in the hope that it will be useful, but WITHOUT ANY 13169695SkanWARRANTY; without even the implied warranty of MERCHANTABILITY or 14169695SkanFITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15169695Skanfor more details. 16169695Skan 17169695SkanYou should have received a copy of the GNU General Public License 18169695Skanalong with GCC; see the file COPYING. If not, write to the Free 19169695SkanSoftware Foundation, 59 Temple Place - Suite 330, Boston, MA 20169695Skan02111-1307, USA. */ 21169695Skan 22169695Skan/* $FreeBSD: head/contrib/gcc/c-tree.h 90083 2002-02-01 18:54:38Z obrien $ */ 23169695Skan 24169695Skan#ifndef GCC_C_TREE_H 25169695Skan#define GCC_C_TREE_H 26169695Skan 27169695Skan#include "c-common.h" 28169695Skan 29169695Skan/* Language-dependent contents of an identifier. */ 30169695Skan 31169695Skan/* The limbo_value is used for block level extern declarations, which need 32169695Skan to be type checked against subsequent extern declarations. They can't 33169695Skan be referenced after they fall out of scope, so they can't be global. 34169695Skan 35169695Skan The rid_code field is used for keywords. It is in all 36169695Skan lang_identifier nodes, because some keywords are only special in a 37169695Skan particular context. */ 38169695Skan 39169695Skanstruct lang_identifier 40169695Skan{ 41169695Skan struct c_common_identifier ignore; 42169695Skan tree global_value, local_value, label_value, implicit_decl; 43169695Skan tree error_locus, limbo_value; 44169695Skan}; 45169695Skan 46169695Skan/* Language-specific declaration information. */ 47169695Skan 48169695Skanstruct lang_decl 49169695Skan{ 50169695Skan struct c_lang_decl base; 51169695Skan /* The return types and parameter types may have variable size. 52169695Skan This is a list of any SAVE_EXPRs that need to be evaluated to 53169695Skan compute those sizes. */ 54169695Skan tree pending_sizes; 55169695Skan}; 56169695Skan 57169695Skan/* Macros for access to language-specific slots in an identifier. */ 58169695Skan/* Each of these slots contains a DECL node or null. */ 59169695Skan 60169695Skan/* This represents the value which the identifier has in the 61169695Skan file-scope namespace. */ 62169695Skan#define IDENTIFIER_GLOBAL_VALUE(NODE) \ 63169695Skan (((struct lang_identifier *) (NODE))->global_value) 64169695Skan/* This represents the value which the identifier has in the current 65169695Skan scope. */ 66169695Skan#define IDENTIFIER_LOCAL_VALUE(NODE) \ 67169695Skan (((struct lang_identifier *) (NODE))->local_value) 68169695Skan/* This represents the value which the identifier has as a label in 69169695Skan the current label scope. */ 70169695Skan#define IDENTIFIER_LABEL_VALUE(NODE) \ 71169695Skan (((struct lang_identifier *) (NODE))->label_value) 72169695Skan/* This records the extern decl of this identifier, if it has had one 73169695Skan at any point in this compilation. */ 74169695Skan#define IDENTIFIER_LIMBO_VALUE(NODE) \ 75169695Skan (((struct lang_identifier *) (NODE))->limbo_value) 76169695Skan/* This records the implicit function decl of this identifier, if it 77169695Skan has had one at any point in this compilation. */ 78169695Skan#define IDENTIFIER_IMPLICIT_DECL(NODE) \ 79169695Skan (((struct lang_identifier *) (NODE))->implicit_decl) 80169695Skan/* This is the last function in which we printed an "undefined variable" 81169695Skan message for this identifier. Value is a FUNCTION_DECL or null. */ 82169695Skan#define IDENTIFIER_ERROR_LOCUS(NODE) \ 83169695Skan (((struct lang_identifier *) (NODE))->error_locus) 84169695Skan 85169695Skan/* In identifiers, C uses the following fields in a special way: 86169695Skan TREE_PUBLIC to record that there was a previous local extern decl. 87169695Skan TREE_USED to record that such a decl was used. 88169695Skan TREE_ADDRESSABLE to record that the address of such a decl was used. */ 89169695Skan 90169695Skan/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */ 91169695Skan#define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE) 92169695Skan 93169695Skan/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */ 94169695Skan#define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE) 95169695Skan 96169695Skan/* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE 97169695Skan nonzero if the definition of the type has already started. */ 98169695Skan#define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE) 99169695Skan 100169695Skan/* In an IDENTIFIER_NODE, nonzero if this identifier is actually a 101169695Skan keyword. C_RID_CODE (node) is then the RID_* value of the keyword, 102169695Skan and C_RID_YYCODE is the token number wanted by Yacc. */ 103169695Skan#define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID) 104169695Skan 105169695Skan/* This function was declared inline. This flag controls the linkage 106169695Skan semantics of 'inline'; whether or not the function is inlined is 107169695Skan controlled by DECL_INLINE. */ 108169695Skan#define DECL_DECLARED_INLINE_P(NODE) \ 109169695Skan (DECL_LANG_SPECIFIC (NODE)->base.declared_inline) 110169695Skan 111169695Skan/* In a RECORD_TYPE, a sorted array of the fields of the type. */ 112169695Skanstruct lang_type 113169695Skan{ 114169695Skan int len; 115169695Skan tree elts[1]; 116169695Skan}; 117169695Skan 118169695Skan/* Record whether a type or decl was written with nonconstant size. 119169695Skan Note that TYPE_SIZE may have simplified to a constant. */ 120169695Skan#define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE) 121169695Skan#define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE) 122169695Skan 123169695Skan#if 0 /* Not used. */ 124169695Skan/* Record whether a decl for a function or function pointer has 125169695Skan already been mentioned (in a warning) because it was called 126169695Skan but didn't have a prototype. */ 127169695Skan#define C_MISSING_PROTOTYPE_WARNED(DECL) DECL_LANG_FLAG_2 (DECL) 128169695Skan#endif 129169695Skan 130169695Skan/* Store a value in that field. */ 131169695Skan#define C_SET_EXP_ORIGINAL_CODE(EXP, CODE) \ 132169695Skan (TREE_COMPLEXITY (EXP) = (int) (CODE)) 133169695Skan 134169695Skan/* Record whether a typedef for type `int' was actually `signed int'. */ 135169695Skan#define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP) 136169695Skan 137169695Skan/* Nonzero for a declaration of a built in function if there has been no 138169695Skan occasion that would declare the function in ordinary C. 139169695Skan Using the function draws a pedantic warning in this case. */ 140169695Skan#define C_DECL_ANTICIPATED(EXP) DECL_LANG_FLAG_3 (EXP) 141169695Skan 142169695Skan/* For FUNCTION_TYPE, a hidden list of types of arguments. The same as 143169695Skan TYPE_ARG_TYPES for functions with prototypes, but created for functions 144169695Skan without prototypes. */ 145169695Skan#define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_BINFO (NODE) 146169695Skan 147169695Skan 148169695Skan/* in c-lang.c and objc-act.c */ 149169695Skanextern tree lookup_interface PARAMS ((tree)); 150169695Skanextern tree is_class_name PARAMS ((tree)); 151169695Skanextern void maybe_objc_check_decl PARAMS ((tree)); 152169695Skanextern void finish_file PARAMS ((void)); 153169695Skanextern int maybe_objc_comptypes PARAMS ((tree, tree, int)); 154169695Skanextern tree maybe_building_objc_message_expr PARAMS ((void)); 155169695Skanextern int recognize_objc_keyword PARAMS ((void)); 156169695Skanextern tree lookup_objc_ivar PARAMS ((tree)); 157169695Skan 158169695Skan 159169695Skan/* in c-parse.in */ 160169695Skanextern void c_parse_init PARAMS ((void)); 161169695Skanextern void c_set_yydebug PARAMS ((int)); 162169695Skanextern int yyparse_1 PARAMS ((void)); 163169695Skan 164169695Skan/* in c-aux-info.c */ 165169695Skanextern void gen_aux_info_record PARAMS ((tree, int, int, int)); 166169695Skan 167169695Skan/* in c-decl.c */ 168169695Skanextern void c_init_decl_processing PARAMS ((void)); 169169695Skanextern void c_print_identifier PARAMS ((FILE *, tree, int)); 170169695Skanextern tree build_array_declarator PARAMS ((tree, tree, int, int)); 171169695Skanextern tree build_enumerator PARAMS ((tree, tree)); 172169695Skanextern int c_decode_option PARAMS ((int, char **)); 173169695Skanextern void c_mark_varargs PARAMS ((void)); 174169695Skanextern void check_for_loop_decls PARAMS ((void)); 175169695Skanextern void clear_parm_order PARAMS ((void)); 176169695Skanextern int complete_array_type PARAMS ((tree, tree, int)); 177169695Skanextern void declare_parm_level PARAMS ((int)); 178169695Skanextern tree define_label PARAMS ((const char *, int, 179169695Skan tree)); 180169695Skanextern void finish_decl PARAMS ((tree, tree, tree)); 181169695Skanextern tree finish_enum PARAMS ((tree, tree, tree)); 182169695Skanextern void finish_function PARAMS ((int)); 183169695Skanextern tree finish_struct PARAMS ((tree, tree, tree)); 184169695Skanextern tree get_parm_info PARAMS ((int)); 185169695Skanextern tree grokfield PARAMS ((const char *, int, tree, tree, tree)); 186169695Skanextern tree groktypename PARAMS ((tree)); 187169695Skanextern tree groktypename_in_parm_context PARAMS ((tree)); 188169695Skanextern tree implicitly_declare PARAMS ((tree)); 189169695Skanextern void implicit_decl_warning PARAMS ((tree)); 190169695Skanextern int in_parm_level_p PARAMS ((void)); 191169695Skanextern void keep_next_level PARAMS ((void)); 192169695Skanextern int kept_level_p PARAMS ((void)); 193169695Skanextern tree lookup_name PARAMS ((tree)); 194169695Skanextern tree lookup_name_current_level PARAMS ((tree)); 195169695Skanextern void parmlist_tags_warning PARAMS ((void)); 196169695Skanextern void pending_xref_error PARAMS ((void)); 197169695Skanextern void mark_c_function_context PARAMS ((struct function *)); 198169695Skanextern void push_c_function_context PARAMS ((struct function *)); 199169695Skanextern void pop_c_function_context PARAMS ((struct function *)); 200169695Skanextern void pop_label_level PARAMS ((void)); 201169695Skanextern void push_label_level PARAMS ((void)); 202169695Skanextern void push_parm_decl PARAMS ((tree)); 203169695Skanextern tree pushdecl_top_level PARAMS ((tree)); 204169695Skanextern void pushtag PARAMS ((tree, tree)); 205169695Skanextern tree set_array_declarator_type PARAMS ((tree, tree, int)); 206169695Skanextern tree shadow_label PARAMS ((tree)); 207169695Skanextern void shadow_tag PARAMS ((tree)); 208169695Skanextern void shadow_tag_warned PARAMS ((tree, int)); 209169695Skanextern tree start_enum PARAMS ((tree)); 210169695Skanextern int start_function PARAMS ((tree, tree, tree)); 211169695Skanextern tree start_decl PARAMS ((tree, tree, int, 212169695Skan tree)); 213169695Skanextern tree start_struct PARAMS ((enum tree_code, tree)); 214169695Skanextern void store_parm_decls PARAMS ((void)); 215169695Skanextern tree xref_tag PARAMS ((enum tree_code, tree)); 216169695Skanextern tree c_begin_compound_stmt PARAMS ((void)); 217169695Skanextern void c_expand_deferred_function PARAMS ((tree)); 218169695Skanextern void c_expand_decl_stmt PARAMS ((tree)); 219169695Skan 220169695Skan 221169695Skan/* in c-objc-common.c */ 222169695Skanextern int c_disregard_inline_limits PARAMS ((tree)); 223169695Skanextern int c_cannot_inline_tree_fn PARAMS ((tree *)); 224169695Skanextern const char *c_objc_common_init PARAMS ((const char *)); 225169695Skanextern int c_missing_noreturn_ok_p PARAMS ((tree)); 226169695Skanextern void c_objc_common_finish_file PARAMS ((void)); 227169695Skanextern int defer_fn PARAMS ((tree)); 228169695Skan 229169695Skan#define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \ 230169695Skan c_build_qualified_type ((TYPE), \ 231169695Skan ((CONST_P) ? TYPE_QUAL_CONST : 0) | \ 232169695Skan ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0)) 233169695Skan 234169695Skan/* in c-typeck.c */ 235169695Skanextern tree require_complete_type PARAMS ((tree)); 236169695Skanextern int comptypes PARAMS ((tree, tree)); 237169695Skanextern tree c_sizeof_nowarn PARAMS ((tree)); 238169695Skanextern tree c_size_in_bytes PARAMS ((tree)); 239169695Skanextern tree build_component_ref PARAMS ((tree, tree)); 240169695Skanextern tree build_indirect_ref PARAMS ((tree, const char *)); 241169695Skanextern tree build_array_ref PARAMS ((tree, tree)); 242169695Skanextern tree build_external_ref PARAMS ((tree, int)); 243169695Skanextern tree parser_build_binary_op PARAMS ((enum tree_code, 244169695Skan tree, tree)); 245169695Skanextern void readonly_warning PARAMS ((tree, const char *)); 246169695Skanextern tree build_conditional_expr PARAMS ((tree, tree, tree)); 247169695Skanextern tree build_compound_expr PARAMS ((tree)); 248169695Skanextern tree c_cast_expr PARAMS ((tree, tree)); 249169695Skanextern tree build_c_cast PARAMS ((tree, tree)); 250169695Skanextern tree build_modify_expr PARAMS ((tree, enum tree_code, 251169695Skan tree)); 252169695Skanextern void store_init_value PARAMS ((tree, tree)); 253169695Skanextern void error_init PARAMS ((const char *)); 254169695Skanextern void pedwarn_init PARAMS ((const char *)); 255169695Skanextern void start_init PARAMS ((tree, tree, int)); 256169695Skanextern void finish_init PARAMS ((void)); 257169695Skanextern void really_start_incremental_init PARAMS ((tree)); 258169695Skanextern void push_init_level PARAMS ((int)); 259169695Skanextern tree pop_init_level PARAMS ((int)); 260169695Skanextern void set_init_index PARAMS ((tree, tree)); 261169695Skanextern void set_init_label PARAMS ((tree)); 262169695Skanextern void process_init_element PARAMS ((tree)); 263169695Skanextern tree build_compound_literal PARAMS ((tree, tree)); 264169695Skanextern void pedwarn_c99 PARAMS ((const char *, ...)) 265169695Skan ATTRIBUTE_PRINTF_1; 266169695Skanextern tree c_start_case PARAMS ((tree)); 267169695Skanextern void c_finish_case PARAMS ((void)); 268169695Skanextern tree simple_asm_stmt PARAMS ((tree)); 269169695Skanextern tree build_asm_stmt PARAMS ((tree, tree, tree, 270169695Skan tree, tree)); 271169695Skan 272169695Skan/* Set to 0 at beginning of a function definition, set to 1 if 273169695Skan a return statement that specifies a return value is seen. */ 274169695Skan 275169695Skanextern int current_function_returns_value; 276169695Skan 277169695Skan/* Set to 0 at beginning of a function definition, set to 1 if 278169695Skan a return statement with no argument is seen. */ 279169695Skan 280169695Skanextern int current_function_returns_null; 281169695Skan 282169695Skan/* Nonzero means the expression being parsed will never be evaluated. 283169695Skan This is a count, since unevaluated expressions can nest. */ 284169695Skan 285169695Skanextern int skip_evaluation; 286169695Skan 287169695Skan/* Nonzero means `$' can be in an identifier. */ 288169695Skan 289169695Skanextern int dollars_in_ident; 290169695Skan 291169695Skan/* Nonzero means allow type mismatches in conditional expressions; 292169695Skan just make their values `void'. */ 293169695Skan 294169695Skanextern int flag_cond_mismatch; 295169695Skan 296169695Skan/* Nonzero means don't recognize the keyword `asm'. */ 297169695Skan 298169695Skanextern int flag_no_asm; 299169695Skan 300169695Skan/* Nonzero means warn about implicit declarations. */ 301169695Skan 302169695Skanextern int warn_implicit; 303169695Skan 304169695Skan/* Nonzero means warn for all old-style non-prototype function decls. */ 305169695Skan 306169695Skanextern int warn_strict_prototypes; 307169695Skan 308169695Skan/* Nonzero means warn about multiple (redundant) decls for the same single 309169695Skan variable or function. */ 310169695Skan 311169695Skanextern int warn_redundant_decls; 312169695Skan 313169695Skan/* Nonzero means warn about extern declarations of objects not at 314169695Skan file-scope level and about *all* declarations of functions (whether 315169695Skan extern or static) not at file-scope level. Note that we exclude 316169695Skan implicit function declarations. To get warnings about those, use 317169695Skan -Wimplicit. */ 318169695Skan 319169695Skanextern int warn_nested_externs; 320169695Skan 321169695Skan/* Nonzero means warn about pointer casts that can drop a type qualifier 322169695Skan from the pointer target type. */ 323169695Skan 324169695Skanextern int warn_cast_qual; 325169695Skan 326169695Skan/* Nonzero means warn when casting a function call to a type that does 327169695Skan not match the return type (e.g. (float)sqrt() or (anything*)malloc() 328169695Skan when there is no previous declaration of sqrt or malloc. */ 329169695Skan 330169695Skanextern int warn_bad_function_cast; 331169695Skan 332169695Skan/* Warn about traditional constructs whose meanings changed in ANSI C. */ 333169695Skan 334169695Skanextern int warn_traditional; 335169695Skan 336169695Skan/* Warn about a subscript that has type char. */ 337169695Skan 338169695Skanextern int warn_char_subscripts; 339169695Skan 340169695Skan/* Warn if main is suspicious. */ 341169695Skan 342169695Skanextern int warn_main; 343169695Skan 344169695Skan/* Nonzero means to allow single precision math even if we're generally 345169695Skan being traditional. */ 346169695Skanextern int flag_allow_single_precision; 347169695Skan 348169695Skan/* Warn if initializer is not completely bracketed. */ 349169695Skan 350169695Skanextern int warn_missing_braces; 351169695Skan 352169695Skan/* Warn about comparison of signed and unsigned values. */ 353169695Skan 354169695Skanextern int warn_sign_compare; 355169695Skan 356169695Skan/* Warn about testing equality of floating point numbers. */ 357169695Skan 358169695Skanextern int warn_float_equal; 359169695Skan 360169695Skan/* Warn about multicharacter constants. */ 361169695Skan 362169695Skanextern int warn_multichar; 363169695Skan 364169695Skan/* Nonzero means we are reading code that came from a system header file. */ 365169695Skan 366169695Skanextern int system_header_p; 367169695Skan 368169695Skan/* Warn about implicit declarations. 1 = warning, 2 = error. */ 369169695Skanextern int mesg_implicit_function_declaration; 370169695Skan 371169695Skan/* In c-decl.c */ 372169695Skanextern void finish_incomplete_decl PARAMS ((tree)); 373169695Skan 374169695Skanextern tree static_ctors; 375169695Skanextern tree static_dtors; 376169695Skan 377169695Skan#endif /* ! GCC_C_TREE_H */ 378169695Skan