Initial revision

From-SVN: r250

gcc/c-tree.h

+/* Definitions for C parsing and type checking.
+   Copyright (C) 1987 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* Language-dependent contents of an identifier.  */
+
+struct lang_identifier
+{
+  struct tree_identifier ignore;
+  tree global_value, local_value, label_value, implicit_decl;
+  tree error_locus;
+};
+
+/* Macros for access to language-specific slots in an identifier.  */
+
+#define IDENTIFIER_GLOBAL_VALUE(NODE)	\
+  (((struct lang_identifier *)(NODE))->global_value)
+#define IDENTIFIER_LOCAL_VALUE(NODE)	\
+  (((struct lang_identifier *)(NODE))->local_value)
+#define IDENTIFIER_LABEL_VALUE(NODE)	\
+  (((struct lang_identifier *)(NODE))->label_value)
+#define IDENTIFIER_IMPLICIT_DECL(NODE)	\
+  (((struct lang_identifier *)(NODE))->implicit_decl)
+#define IDENTIFIER_ERROR_LOCUS(NODE)	\
+  (((struct lang_identifier *)(NODE))->error_locus)
+
+/* In identifiers, C uses the following fields in a special way:
+   TREE_PUBLIC        to record that there was a previous local extern decl.
+   TREE_USED          to record that such a decl was used.
+   TREE_ADDRESSABLE   to record that the address of such a decl was used.  */
+
+/* Nonzero means reject anything that ANSI standard C forbids.  */
+extern int pedantic;
+
+/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
+#define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type)
+
+/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
+#define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type)
+
+/* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
+   nonzero if the definition of the type has already started.  */
+#define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type)
+
+/* In a RECORD_TYPE, a sorted array of the fields of the type.  */
+struct lang_type
+{
+  int len;
+  tree elts[1];
+};
+
+/* Mark which labels are explicitly declared.
+   These may be shadowed, and may be referenced from nested functions.  */
+#define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
+
+/* Record whether a type or decl was written with nonconstant size.
+   Note that TYPE_SIZE may have simplified to a constant.  */
+#define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
+#define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
+
+/* Record in each node resulting from a binary operator
+   what operator was specified for it.  */
+#define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
+
+#if 0 /* Not used.  */
+/* Record whether a decl for a function or function pointer has
+   already been mentioned (in a warning) because it was called
+   but didn't have a prototype.  */
+#define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl)
+#endif
+
+/* Store a value in that field.  */
+#define C_SET_EXP_ORIGINAL_CODE(exp, code) \
+  (TREE_COMPLEXITY (exp) = (int)(code))
+
+/* Record whether a typedef for type `int' was actually `signed int'.  */
+#define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
+
+/* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
+   TYPE_ARG_TYPES for functions with prototypes, but created for functions
+   without prototypes.  */
+#define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE)
+
+/* in c-typecheck.c */
+extern tree build_component_ref (), build_conditional_expr (), build_compound_expr ();
+extern tree build_unary_op (), build_binary_op (), build_function_call ();
+extern tree parser_build_binary_op ();
+extern tree build_indirect_ref (), build_array_ref (), build_c_cast ();
+extern tree build_modify_expr ();
+extern tree c_sizeof (), c_alignof (), c_alignof_expr ();
+extern void store_init_value ();
+extern tree digest_init ();
+extern tree c_expand_start_case ();
+extern tree default_conversion ();
+
+/* Given two integer or real types, return the type for their sum.
+   Given two compatible ANSI C types, returns the merged type.  */
+
+extern tree common_type ();
+
+/* in c-decl.c */
+extern tree build_label ();
+
+extern int start_function ();
+extern void finish_function ();
+extern void store_parm_decls ();
+extern tree get_parm_info ();
+extern tree combine_parm_decls ();
+
+extern void pushlevel ();
+extern tree poplevel ();
+
+extern tree groktypename (), lookup_name ();
+
+extern tree lookup_label (), define_label (), shadow_label ();
+
+extern tree implicitly_declare (), getdecls (), gettags ();
+
+extern tree start_decl ();
+extern void finish_decl ();
+
+extern tree start_struct (), finish_struct (), xref_tag ();
+extern tree grokfield ();
+
+extern tree start_enum (), finish_enum ();
+extern tree build_enumerator ();
+
+extern tree make_index_type ();
+
+/* Add qualifiers to a type, in the fashion for C.  */
+extern tree c_build_type_variant ();
+
+/* Functions in c-common.c: */
+
+/* Concatenate a list of STRING_CST nodes into one STRING_CST.  */
+extern tree combine_strings ();
+
+/* Validate the expression after `case' and apply default promotions.  */
+extern tree check_case_value ();
+
+/* Print an error message for invalid operands to arith operation CODE.
+   NOP_EXPR is used as a special case (see truthvalue_conversion).  */
+
+extern void binary_op_error ();
+
+/* Subroutine of build_binary_op, used for comparison operations.
+   See if the operands have both been converted from subword integer types
+   and, if so, perhaps change them both back to their original type.  */
+
+extern tree shorten_compare ();
+
+/* Read the rest of the current #-directive line.  */
+extern char *get_directive_line ();
+
+extern int maybe_objc_comptypes ();
+extern tree maybe_building_objc_message_expr ();
+
+/* Standard named or nameless data types of the C compiler.  */
+
+extern tree short_integer_type_node, integer_type_node;
+extern tree long_integer_type_node, long_long_integer_type_node;
+extern tree short_unsigned_type_node, unsigned_type_node;
+extern tree long_unsigned_type_node, long_long_unsigned_type_node;
+extern tree ptrdiff_type_node;
+extern tree unsigned_char_type_node, signed_char_type_node, char_type_node;
+extern tree wchar_type_node, signed_wchar_type_node, unsigned_wchar_type_node;
+extern tree float_type_node, double_type_node, long_double_type_node;
+extern tree void_type_node, ptr_type_node, const_ptr_type_node;
+extern tree string_type_node, const_string_type_node;
+extern tree char_array_type_node, int_array_type_node, wchar_array_type_node;
+extern tree default_function_type;
+extern tree double_ftype_double, double_ftype_double_double;
+extern tree int_ftype_int, long_ftype_long;
+extern tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int;
+extern tree void_ftype_ptr_int_int, string_ftype_ptr_ptr;
+extern tree int_ftype_string_string, int_ftype_cptr_cptr_sizet;
+
+/* Set to 0 at beginning of a function definition, set to 1 if
+   a return statement that specifies a return value is seen.  */
+
+extern int current_function_returns_value;
+
+/* Set to 0 at beginning of a function definition, set to 1 if
+   a return statement with no argument is seen.  */
+
+extern int current_function_returns_null;
+
+/* Nonzero means `$' can be in an identifier.  */
+
+extern int dollars_in_ident;
+
+/* Nonzero means allow type mismatches in conditional expressions;
+   just make their values `void'.   */
+
+extern int flag_cond_mismatch;
+
+/* Nonzero means don't recognize the keyword `asm'.  */
+
+extern int flag_no_asm;
+
+/* Nonzero means ignore `#ident' directives.  */
+
+extern int flag_no_ident;
+
+/* Nonzero means warn about implicit declarations.  */
+
+extern int warn_implicit;
+
+/* Nonzero means give string constants the type `const char *'
+   to get extra warnings from them.  These warnings will be too numerous
+   to be useful, except in thoroughly ANSIfied programs.  */
+
+extern int warn_write_strings;
+
+/* Nonzero means warn about sizeof (function) or addition/subtraction
+   of function pointers.  */
+
+extern int warn_pointer_arith;
+
+/* Nonzero means warn for all old-style non-prototype function decls.  */
+
+extern int warn_strict_prototypes;
+
+/* Nonzero means warn about multiple (redundant) decls for the same single
+   variable or function.  */
+
+extern int warn_redundant_decls;
+
+/* Nonzero means warn about extern declarations of objects not at
+   file-scope level and about *all* declarations of functions (whether
+   extern or static) not at file-scope level.  Note that we exclude
+   implicit function declarations.  To get warnings about those, use
+   -Wimplicit.  */
+
+extern int warn_nested_externs;
+
+/* Nonzero means warn about pointer casts that can drop a type qualifier
+   from the pointer target type.  */
+
+extern int warn_cast_qual;
+
+/* Warn about traditional constructs whose meanings changed in ANSI C.  */
+
+extern int warn_traditional;
+
+/* Warn about *printf or *scanf format/argument anomalies. */
+
+extern int warn_format;
+
+/* Warn about a subscript that has type char.  */
+
+extern int warn_char_subscripts;
+
+/* Warn if a type conversion is done that might have confusing results.  */
+
+extern int warn_conversion;
+
+/* Nonzero means do some things the same way PCC does.  */
+
+extern int flag_traditional;
+
+/* Nonzero means warn about suggesting putting in ()'s.  */
+
+extern int warn_parentheses;
+
+/* Nonzero means this is a function to call to perform comptypes
+   on two record types.  */
+
+extern int (*comptypes_record_hook) ();
+
+/* Nonzero means we are reading code that came from a system header file.  */
+
+extern int system_header_p;