c-tree.h

GCC编译器源代码

/* Definitions for C parsing and type checking.
   Copyright (C) 1987, 1993, 1994, 1995, 1997 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, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#ifndef _C_TREE_H
#define _C_TREE_H

/* Language-dependent contents of an identifier.  */

/* The limbo_value is used for block level extern declarations, which need
   to be type checked against subsequent extern declarations.  They can't
   be referenced after they fall out of scope, so they can't be global.  */

struct lang_identifier
{
  struct tree_identifier ignore;
  tree global_value, local_value, label_value, implicit_decl;
  tree error_locus, limbo_value;
};

/* Macros for access to language-specific slots in an identifier.  */
/* Each of these slots contains a DECL node or null.  */

/* This represents the value which the identifier has in the
   file-scope namespace.  */
#define IDENTIFIER_GLOBAL_VALUE(NODE)	\
  (((struct lang_identifier *) (NODE))->global_value)
/* This represents the value which the identifier has in the current
   scope.  */
#define IDENTIFIER_LOCAL_VALUE(NODE)	\
  (((struct lang_identifier *) (NODE))->local_value)
/* This represents the value which the identifier has as a label in
   the current label scope.  */
#define IDENTIFIER_LABEL_VALUE(NODE)	\
  (((struct lang_identifier *) (NODE))->label_value)
/* This records the extern decl of this identifier, if it has had one
   at any point in this compilation.  */
#define IDENTIFIER_LIMBO_VALUE(NODE)	\
  (((struct lang_identifier *) (NODE))->limbo_value)
/* This records the implicit function decl of this identifier, if it
   has had one at any point in this compilation.  */
#define IDENTIFIER_IMPLICIT_DECL(NODE)	\
  (((struct lang_identifier *) (NODE))->implicit_decl)
/* This is the last function in which we printed an "undefined variable"
   message for this identifier.  Value is a FUNCTION_DECL or null.  */
#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))

/* Nonzero for a declaration of a built in function if there has been no
   occasion that would declare the function in ordinary C.
   Using the function draws a pedantic warning in this case.  */
#define C_DECL_ANTICIPATED(exp) DECL_LANG_FLAG_3 ((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 a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
#define DECL_C_BIT_FIELD(NODE) DECL_LANG_FLAG_4 (NODE)

/* Nonzero if the type T promotes to itself.
   ANSI C states explicitly the list of types that promote;
   in particular, short promotes to int even if they have the same width.  */
#define C_PROMOTING_INTEGER_TYPE_P(t)				\
  (TREE_CODE ((t)) == INTEGER_TYPE				\
   && (TYPE_MAIN_VARIANT (t) == char_type_node			\
       || TYPE_MAIN_VARIANT (t) == signed_char_type_node	\
       || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node	\
       || TYPE_MAIN_VARIANT (t) == short_integer_type_node	\
       || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node))

/* In a VAR_DECL, means the variable is really an iterator.  */
#define ITERATOR_P(D) (DECL_LANG_FLAG_4(D))

/* In a VAR_DECL for an iterator, means we are within
   an explicit loop over that iterator.  */
#define ITERATOR_BOUND_P(NODE) ((NODE)->common.readonly_flag)

/* in c-lang.c and objc-act.c */
extern tree lookup_interface			PROTO((tree));
extern tree is_class_name			PROTO((tree));
extern void maybe_objc_check_decl		PROTO((tree));
extern int maybe_objc_comptypes                 PROTO((tree, tree, int));
extern tree maybe_building_objc_message_expr    PROTO((void));
extern tree maybe_objc_method_name		PROTO((tree));
extern int recognize_objc_keyword		PROTO((void));
extern tree build_objc_string			PROTO((int, char *));

/* in c-aux-info.c */
extern void gen_aux_info_record                 PROTO((tree, int, int, int));

/* in c-common.c */
extern void declare_function_name               PROTO((void));
extern void decl_attributes                     PROTO((tree, tree, tree));
extern void init_function_format_info		PROTO((void));
extern void record_function_format		PROTO((tree, tree, int, int, int));
extern void check_function_format		PROTO((tree, tree, tree));
/* 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                     PROTO((enum tree_code));
extern void c_expand_expr_stmt                  PROTO((tree));
/* Validate the expression after `case' and apply default promotions.  */
extern tree check_case_value                    PROTO((tree));
/* Concatenate a list of STRING_CST nodes into one STRING_CST.  */
extern tree combine_strings                     PROTO((tree));
extern void constant_expression_warning         PROTO((tree));
extern tree convert_and_check			PROTO((tree, tree));
extern void overflow_warning			PROTO((tree));
extern void unsigned_conversion_warning		PROTO((tree, tree));
/* Read the rest of the current #-directive line.  */
extern char *get_directive_line                 PROTO((FILE *));
/* 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                     PROTO((tree *, tree *, tree *, enum tree_code *));
/* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
   or validate its data type for an `if' or `while' statement or ?..: exp. */
extern tree truthvalue_conversion               PROTO((tree));
extern tree type_for_mode                       PROTO((enum machine_mode, int));
extern tree type_for_size                       PROTO((unsigned, int));

/* in c-convert.c */
extern tree convert                             PROTO((tree, tree));

/* in c-decl.c */
/* Standard named or nameless data types of the C compiler.  */
extern tree char_array_type_node;
extern tree char_type_node;
extern tree const_ptr_type_node;
extern tree const_string_type_node;
extern tree default_function_type;
extern tree double_ftype_double;
extern tree double_ftype_double_double;
extern tree double_type_node;
extern tree float_type_node;
extern tree intDI_type_node;
extern tree intHI_type_node;
extern tree intQI_type_node;
extern tree intSI_type_node;
extern tree int_array_type_node;
extern tree int_ftype_cptr_cptr_sizet;
extern tree int_ftype_int;
extern tree int_ftype_ptr_ptr_int;
extern tree int_ftype_string_string;
extern tree integer_type_node;
extern tree long_double_type_node;
extern tree long_ftype_long;
extern tree long_integer_type_node;
extern tree long_long_integer_type_node;
extern tree long_long_unsigned_type_node;
extern tree long_unsigned_type_node;
extern tree complex_integer_type_node;
extern tree complex_float_type_node;
extern tree complex_double_type_node;
extern tree complex_long_double_type_node;
extern tree ptr_type_node;
extern tree ptrdiff_type_node;
extern tree short_integer_type_node;
extern tree short_unsigned_type_node;
extern tree signed_char_type_node;
extern tree signed_wchar_type_node;
extern tree string_ftype_ptr_ptr;
extern tree string_type_node;
extern tree unsigned_char_type_node;
extern tree unsigned_intDI_type_node;
extern tree unsigned_intHI_type_node;
extern tree unsigned_intQI_type_node;
extern tree unsigned_intSI_type_node;
extern tree unsigned_type_node;
extern tree unsigned_wchar_type_node;
extern tree void_ftype_ptr_int_int;
extern tree void_ftype_ptr_ptr_int;
extern tree void_type_node;
extern tree wchar_array_type_node;
extern tree wchar_type_node;
extern tree boolean_type_node;
extern tree boolean_true_node;
extern tree boolean_false_node;

extern tree build_enumerator                    PROTO((tree, tree));
/* Declare a predefined function.  Return the declaration.  */
extern tree builtin_function                    PROTO((char *, tree, enum built_in_function function_, char *));
/* Add qualifiers to a type, in the fashion for C.  */
extern tree c_build_type_variant                PROTO((tree, int, int));
extern int  c_decode_option                     PROTO((char *));