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Annotation of gcc/c-tree.h, revision 1.1

1.1     ! root        1: /* Definitions for C parsing and type checking.
        !             2:    Copyright (C) 1987 Free Software Foundation, Inc.
        !             3: 
        !             4: This file is part of GNU CC.
        !             5: 
        !             6: GNU CC is free software; you can redistribute it and/or modify
        !             7: it under the terms of the GNU General Public License as published by
        !             8: the Free Software Foundation; either version 2, or (at your option)
        !             9: any later version.
        !            10: 
        !            11: GNU CC is distributed in the hope that it will be useful,
        !            12: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            14: GNU General Public License for more details.
        !            15: 
        !            16: You should have received a copy of the GNU General Public License
        !            17: along with GNU CC; see the file COPYING.  If not, write to
        !            18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            19: 
        !            20: /* Language-dependent contents of an identifier.  */
        !            21: 
        !            22: struct lang_identifier
        !            23: {
        !            24:   struct tree_identifier ignore;
        !            25:   tree global_value, local_value, label_value, implicit_decl;
        !            26:   tree error_locus;
        !            27: };
        !            28: 
        !            29: /* Macros for access to language-specific slots in an identifier.  */
        !            30: 
        !            31: #define IDENTIFIER_GLOBAL_VALUE(NODE)  \
        !            32:   (((struct lang_identifier *)(NODE))->global_value)
        !            33: #define IDENTIFIER_LOCAL_VALUE(NODE)   \
        !            34:   (((struct lang_identifier *)(NODE))->local_value)
        !            35: #define IDENTIFIER_LABEL_VALUE(NODE)   \
        !            36:   (((struct lang_identifier *)(NODE))->label_value)
        !            37: #define IDENTIFIER_IMPLICIT_DECL(NODE) \
        !            38:   (((struct lang_identifier *)(NODE))->implicit_decl)
        !            39: #define IDENTIFIER_ERROR_LOCUS(NODE)   \
        !            40:   (((struct lang_identifier *)(NODE))->error_locus)
        !            41: 
        !            42: /* In identifiers, C uses the following fields in a special way:
        !            43:    TREE_PUBLIC        to record that there was a previous local extern decl.
        !            44:    TREE_USED          to record that such a decl was used.
        !            45:    TREE_ADDRESSABLE   to record that the address of such a decl was used.  */
        !            46: 
        !            47: /* Nonzero means reject anything that ANSI standard C forbids.  */
        !            48: extern int pedantic;
        !            49: 
        !            50: /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
        !            51: #define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type)
        !            52: 
        !            53: /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
        !            54: #define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type)
        !            55: 
        !            56: /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
        !            57:    nonzero if the definition of the type has already started.  */
        !            58: #define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type)
        !            59: 
        !            60: /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
        !            61: struct lang_type
        !            62: {
        !            63:   int len;
        !            64:   tree elts[1];
        !            65: };
        !            66: 
        !            67: /* Mark which labels are explicitly declared.
        !            68:    These may be shadowed, and may be referenced from nested functions.  */
        !            69: #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
        !            70: 
        !            71: /* Record whether a type or decl was written with nonconstant size.
        !            72:    Note that TYPE_SIZE may have simplified to a constant.  */
        !            73: #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
        !            74: #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
        !            75: 
        !            76: /* Record in each node resulting from a binary operator
        !            77:    what operator was specified for it.  */
        !            78: #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
        !            79: 
        !            80: #if 0 /* Not used.  */
        !            81: /* Record whether a decl for a function or function pointer has
        !            82:    already been mentioned (in a warning) because it was called
        !            83:    but didn't have a prototype.  */
        !            84: #define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl)
        !            85: #endif
        !            86: 
        !            87: /* Store a value in that field.  */
        !            88: #define C_SET_EXP_ORIGINAL_CODE(exp, code) \
        !            89:   (TREE_COMPLEXITY (exp) = (int)(code))
        !            90: 
        !            91: /* Record whether a typedef for type `int' was actually `signed int'.  */
        !            92: #define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
        !            93: 
        !            94: /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
        !            95:    TYPE_ARG_TYPES for functions with prototypes, but created for functions
        !            96:    without prototypes.  */
        !            97: #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE)
        !            98: 
        !            99: /* in c-typecheck.c */
        !           100: extern tree build_component_ref (), build_conditional_expr (), build_compound_expr ();
        !           101: extern tree build_unary_op (), build_binary_op (), build_function_call ();
        !           102: extern tree parser_build_binary_op ();
        !           103: extern tree build_indirect_ref (), build_array_ref (), build_c_cast ();
        !           104: extern tree build_modify_expr ();
        !           105: extern tree c_sizeof (), c_alignof (), c_alignof_expr ();
        !           106: extern void store_init_value ();
        !           107: extern tree digest_init ();
        !           108: extern tree c_expand_start_case ();
        !           109: extern tree default_conversion ();
        !           110: 
        !           111: /* Given two integer or real types, return the type for their sum.
        !           112:    Given two compatible ANSI C types, returns the merged type.  */
        !           113: 
        !           114: extern tree common_type ();
        !           115: 
        !           116: /* in c-decl.c */
        !           117: extern tree build_label ();
        !           118: 
        !           119: extern int start_function ();
        !           120: extern void finish_function ();
        !           121: extern void store_parm_decls ();
        !           122: extern tree get_parm_info ();
        !           123: extern tree combine_parm_decls ();
        !           124: 
        !           125: extern void pushlevel ();
        !           126: extern tree poplevel ();
        !           127: 
        !           128: extern tree groktypename (), lookup_name ();
        !           129: 
        !           130: extern tree lookup_label (), define_label (), shadow_label ();
        !           131: 
        !           132: extern tree implicitly_declare (), getdecls (), gettags ();
        !           133: 
        !           134: extern tree start_decl ();
        !           135: extern void finish_decl ();
        !           136: 
        !           137: extern tree start_struct (), finish_struct (), xref_tag ();
        !           138: extern tree grokfield ();
        !           139: 
        !           140: extern tree start_enum (), finish_enum ();
        !           141: extern tree build_enumerator ();
        !           142: 
        !           143: extern tree make_index_type ();
        !           144: 
        !           145: /* Add qualifiers to a type, in the fashion for C.  */
        !           146: extern tree c_build_type_variant ();
        !           147: 
        !           148: /* Functions in c-common.c: */
        !           149: 
        !           150: /* Concatenate a list of STRING_CST nodes into one STRING_CST.  */
        !           151: extern tree combine_strings ();
        !           152: 
        !           153: /* Validate the expression after `case' and apply default promotions.  */
        !           154: extern tree check_case_value ();
        !           155: 
        !           156: /* Print an error message for invalid operands to arith operation CODE.
        !           157:    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
        !           158: 
        !           159: extern void binary_op_error ();
        !           160: 
        !           161: /* Subroutine of build_binary_op, used for comparison operations.
        !           162:    See if the operands have both been converted from subword integer types
        !           163:    and, if so, perhaps change them both back to their original type.  */
        !           164: 
        !           165: extern tree shorten_compare ();
        !           166: 
        !           167: /* Read the rest of the current #-directive line.  */
        !           168: extern char *get_directive_line ();
        !           169: 
        !           170: extern int maybe_objc_comptypes ();
        !           171: extern tree maybe_building_objc_message_expr ();
        !           172: 
        !           173: /* Standard named or nameless data types of the C compiler.  */
        !           174: 
        !           175: extern tree short_integer_type_node, integer_type_node;
        !           176: extern tree long_integer_type_node, long_long_integer_type_node;
        !           177: extern tree short_unsigned_type_node, unsigned_type_node;
        !           178: extern tree long_unsigned_type_node, long_long_unsigned_type_node;
        !           179: extern tree ptrdiff_type_node;
        !           180: extern tree unsigned_char_type_node, signed_char_type_node, char_type_node;
        !           181: extern tree wchar_type_node, signed_wchar_type_node, unsigned_wchar_type_node;
        !           182: extern tree float_type_node, double_type_node, long_double_type_node;
        !           183: extern tree void_type_node, ptr_type_node, const_ptr_type_node;
        !           184: extern tree string_type_node, const_string_type_node;
        !           185: extern tree char_array_type_node, int_array_type_node, wchar_array_type_node;
        !           186: extern tree default_function_type;
        !           187: extern tree double_ftype_double, double_ftype_double_double;
        !           188: extern tree int_ftype_int, long_ftype_long;
        !           189: extern tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int;
        !           190: extern tree void_ftype_ptr_int_int, string_ftype_ptr_ptr;
        !           191: extern tree int_ftype_string_string, int_ftype_cptr_cptr_sizet;
        !           192: 
        !           193: /* Set to 0 at beginning of a function definition, set to 1 if
        !           194:    a return statement that specifies a return value is seen.  */
        !           195: 
        !           196: extern int current_function_returns_value;
        !           197: 
        !           198: /* Set to 0 at beginning of a function definition, set to 1 if
        !           199:    a return statement with no argument is seen.  */
        !           200: 
        !           201: extern int current_function_returns_null;
        !           202: 
        !           203: /* Nonzero means `$' can be in an identifier.  */
        !           204: 
        !           205: extern int dollars_in_ident;
        !           206: 
        !           207: /* Nonzero means allow type mismatches in conditional expressions;
        !           208:    just make their values `void'.   */
        !           209: 
        !           210: extern int flag_cond_mismatch;
        !           211: 
        !           212: /* Nonzero means don't recognize the keyword `asm'.  */
        !           213: 
        !           214: extern int flag_no_asm;
        !           215: 
        !           216: /* Nonzero means ignore `#ident' directives.  */
        !           217: 
        !           218: extern int flag_no_ident;
        !           219: 
        !           220: /* Nonzero means warn about implicit declarations.  */
        !           221: 
        !           222: extern int warn_implicit;
        !           223: 
        !           224: /* Nonzero means give string constants the type `const char *'
        !           225:    to get extra warnings from them.  These warnings will be too numerous
        !           226:    to be useful, except in thoroughly ANSIfied programs.  */
        !           227: 
        !           228: extern int warn_write_strings;
        !           229: 
        !           230: /* Nonzero means warn about sizeof (function) or addition/subtraction
        !           231:    of function pointers.  */
        !           232: 
        !           233: extern int warn_pointer_arith;
        !           234: 
        !           235: /* Nonzero means warn for all old-style non-prototype function decls.  */
        !           236: 
        !           237: extern int warn_strict_prototypes;
        !           238: 
        !           239: /* Nonzero means warn about multiple (redundant) decls for the same single
        !           240:    variable or function.  */
        !           241: 
        !           242: extern int warn_redundant_decls;
        !           243: 
        !           244: /* Nonzero means warn about extern declarations of objects not at
        !           245:    file-scope level and about *all* declarations of functions (whether
        !           246:    extern or static) not at file-scope level.  Note that we exclude
        !           247:    implicit function declarations.  To get warnings about those, use
        !           248:    -Wimplicit.  */
        !           249: 
        !           250: extern int warn_nested_externs;
        !           251: 
        !           252: /* Nonzero means warn about pointer casts that can drop a type qualifier
        !           253:    from the pointer target type.  */
        !           254: 
        !           255: extern int warn_cast_qual;
        !           256: 
        !           257: /* Warn about traditional constructs whose meanings changed in ANSI C.  */
        !           258: 
        !           259: extern int warn_traditional;
        !           260: 
        !           261: /* Warn about *printf or *scanf format/argument anomalies. */
        !           262: 
        !           263: extern int warn_format;
        !           264: 
        !           265: /* Warn about a subscript that has type char.  */
        !           266: 
        !           267: extern int warn_char_subscripts;
        !           268: 
        !           269: /* Warn if a type conversion is done that might have confusing results.  */
        !           270: 
        !           271: extern int warn_conversion;
        !           272: 
        !           273: /* Nonzero means do some things the same way PCC does.  */
        !           274: 
        !           275: extern int flag_traditional;
        !           276: 
        !           277: /* Nonzero means warn about suggesting putting in ()'s.  */
        !           278: 
        !           279: extern int warn_parentheses;
        !           280: 
        !           281: /* Nonzero means this is a function to call to perform comptypes
        !           282:    on two record types.  */
        !           283: 
        !           284: extern int (*comptypes_record_hook) ();
        !           285: 
        !           286: /* Nonzero means we are reading code that came from a system header file.  */
        !           287: 
        !           288: extern int system_header_p;

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