557 lines
23 KiB
C
557 lines
23 KiB
C
/* Definitions for C parsing and type checking.
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Copyright (C) 1987, 93, 94, 95, 97, 98, 1999 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* $FreeBSD$ */
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#ifndef _C_TREE_H
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#define _C_TREE_H
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/* Language-dependent contents of an identifier. */
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/* The limbo_value is used for block level extern declarations, which need
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to be type checked against subsequent extern declarations. They can't
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be referenced after they fall out of scope, so they can't be global. */
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struct lang_identifier
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{
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struct tree_identifier ignore;
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tree global_value, local_value, label_value, implicit_decl;
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tree error_locus, limbo_value;
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};
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/* Macros for access to language-specific slots in an identifier. */
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/* Each of these slots contains a DECL node or null. */
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/* This represents the value which the identifier has in the
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file-scope namespace. */
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#define IDENTIFIER_GLOBAL_VALUE(NODE) \
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(((struct lang_identifier *) (NODE))->global_value)
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/* This represents the value which the identifier has in the current
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scope. */
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#define IDENTIFIER_LOCAL_VALUE(NODE) \
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(((struct lang_identifier *) (NODE))->local_value)
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/* This represents the value which the identifier has as a label in
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the current label scope. */
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#define IDENTIFIER_LABEL_VALUE(NODE) \
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(((struct lang_identifier *) (NODE))->label_value)
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/* This records the extern decl of this identifier, if it has had one
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at any point in this compilation. */
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#define IDENTIFIER_LIMBO_VALUE(NODE) \
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(((struct lang_identifier *) (NODE))->limbo_value)
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/* This records the implicit function decl of this identifier, if it
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has had one at any point in this compilation. */
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#define IDENTIFIER_IMPLICIT_DECL(NODE) \
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(((struct lang_identifier *) (NODE))->implicit_decl)
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/* This is the last function in which we printed an "undefined variable"
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message for this identifier. Value is a FUNCTION_DECL or null. */
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#define IDENTIFIER_ERROR_LOCUS(NODE) \
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(((struct lang_identifier *) (NODE))->error_locus)
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/* In identifiers, C uses the following fields in a special way:
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TREE_PUBLIC to record that there was a previous local extern decl.
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TREE_USED to record that such a decl was used.
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TREE_ADDRESSABLE to record that the address of such a decl was used. */
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/* Nonzero means reject anything that ANSI standard C forbids. */
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extern int pedantic;
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/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
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#define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type)
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/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
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#define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type)
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/* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
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nonzero if the definition of the type has already started. */
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#define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type)
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/* C types are partitioned into three subsets: object, function, and
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incomplete types. */
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#define C_TYPE_OBJECT_P(type) \
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(TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
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#define C_TYPE_FUNCTION_P(type) \
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(TREE_CODE (type) == FUNCTION_TYPE)
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#define C_TYPE_INCOMPLETE_P(type) \
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(TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
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/* For convenience we define a single macro to identify the class of
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object or incomplete types. */
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#define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
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(!C_TYPE_FUNCTION_P (type))
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/* In a RECORD_TYPE, a sorted array of the fields of the type. */
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struct lang_type
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{
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int len;
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tree elts[1];
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};
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/* Mark which labels are explicitly declared.
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These may be shadowed, and may be referenced from nested functions. */
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#define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
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/* Record whether a type or decl was written with nonconstant size.
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Note that TYPE_SIZE may have simplified to a constant. */
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#define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
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#define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
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/* Record in each node resulting from a binary operator
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what operator was specified for it. */
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#define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
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#if 0 /* Not used. */
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/* Record whether a decl for a function or function pointer has
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already been mentioned (in a warning) because it was called
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but didn't have a prototype. */
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#define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl)
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#endif
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/* Store a value in that field. */
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#define C_SET_EXP_ORIGINAL_CODE(exp, code) \
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(TREE_COMPLEXITY (exp) = (int) (code))
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/* Record whether a typedef for type `int' was actually `signed int'. */
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#define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
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/* Nonzero for a declaration of a built in function if there has been no
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occasion that would declare the function in ordinary C.
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Using the function draws a pedantic warning in this case. */
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#define C_DECL_ANTICIPATED(exp) DECL_LANG_FLAG_3 ((exp))
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/* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
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TYPE_ARG_TYPES for functions with prototypes, but created for functions
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without prototypes. */
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#define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE)
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/* In a FIELD_DECL, nonzero if the decl was originally a bitfield. */
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#define DECL_C_BIT_FIELD(NODE) DECL_LANG_FLAG_4 (NODE)
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/* Nonzero if the type T promotes to itself.
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ANSI C states explicitly the list of types that promote;
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in particular, short promotes to int even if they have the same width. */
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#define C_PROMOTING_INTEGER_TYPE_P(t) \
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(TREE_CODE ((t)) == INTEGER_TYPE \
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&& (TYPE_MAIN_VARIANT (t) == char_type_node \
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|| TYPE_MAIN_VARIANT (t) == signed_char_type_node \
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|| TYPE_MAIN_VARIANT (t) == unsigned_char_type_node \
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|| TYPE_MAIN_VARIANT (t) == short_integer_type_node \
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|| TYPE_MAIN_VARIANT (t) == short_unsigned_type_node))
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/* In a VAR_DECL, means the variable is really an iterator. */
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#define ITERATOR_P(D) (DECL_LANG_FLAG_4(D))
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/* In a VAR_DECL for an iterator, means we are within
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an explicit loop over that iterator. */
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#define ITERATOR_BOUND_P(NODE) ((NODE)->common.readonly_flag)
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/* in c-lang.c and objc-act.c */
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extern tree lookup_interface PROTO((tree));
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extern tree is_class_name PROTO((tree));
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extern void maybe_objc_check_decl PROTO((tree));
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extern void finish_file PROTO((void));
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extern int maybe_objc_comptypes PROTO((tree, tree, int));
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extern tree maybe_building_objc_message_expr PROTO((void));
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extern tree maybe_objc_method_name PROTO((tree));
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extern int recognize_objc_keyword PROTO((void));
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extern tree build_objc_string PROTO((int, const char *));
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/* in c-aux-info.c */
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extern void gen_aux_info_record PROTO((tree, int, int, int));
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/* in c-common.c */
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extern void declare_function_name PROTO((void));
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extern void decl_attributes PROTO((tree, tree, tree));
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extern void init_function_format_info PROTO((void));
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extern void check_function_format PROTO((tree, tree, tree));
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extern int c_get_alias_set PROTO((tree));
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extern void c_apply_type_quals_to_decl PROTO((int, tree));
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/* Print an error message for invalid operands to arith operation CODE.
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NOP_EXPR is used as a special case (see truthvalue_conversion). */
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extern void binary_op_error PROTO((enum tree_code));
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extern void c_expand_expr_stmt PROTO((tree));
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extern void c_expand_start_cond PROTO((tree, int, int));
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extern void c_expand_start_else PROTO((void));
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extern void c_expand_end_cond PROTO((void));
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/* Validate the expression after `case' and apply default promotions. */
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extern tree check_case_value PROTO((tree));
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/* Concatenate a list of STRING_CST nodes into one STRING_CST. */
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extern tree combine_strings PROTO((tree));
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extern void constant_expression_warning PROTO((tree));
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extern tree convert_and_check PROTO((tree, tree));
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extern void overflow_warning PROTO((tree));
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extern void unsigned_conversion_warning PROTO((tree, tree));
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/* Read the rest of the current #-directive line. */
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#if USE_CPPLIB
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extern char *get_directive_line PROTO((void));
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#define GET_DIRECTIVE_LINE() get_directive_line ()
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#else
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extern char *get_directive_line PROTO((FILE *));
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#define GET_DIRECTIVE_LINE() get_directive_line (finput)
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#endif
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/* Subroutine of build_binary_op, used for comparison operations.
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See if the operands have both been converted from subword integer types
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and, if so, perhaps change them both back to their original type. */
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extern tree shorten_compare PROTO((tree *, tree *, tree *, enum tree_code *));
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/* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
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or validate its data type for an `if' or `while' statement or ?..: exp. */
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extern tree truthvalue_conversion PROTO((tree));
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extern tree type_for_mode PROTO((enum machine_mode, int));
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extern tree type_for_size PROTO((unsigned, int));
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/* in c-convert.c */
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extern tree convert PROTO((tree, tree));
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/* in c-decl.c */
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/* Standard named or nameless data types of the C compiler. */
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extern tree char_array_type_node;
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extern tree char_type_node;
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extern tree const_ptr_type_node;
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extern tree const_string_type_node;
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extern tree default_function_type;
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extern tree double_ftype_double;
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extern tree double_ftype_double_double;
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extern tree double_type_node;
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extern tree float_type_node;
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#if HOST_BITS_PER_WIDE_INT >= 64
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extern tree intTI_type_node;
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#endif
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extern tree intDI_type_node;
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extern tree intHI_type_node;
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extern tree intQI_type_node;
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extern tree intSI_type_node;
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extern tree int_array_type_node;
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extern tree int_ftype_cptr_cptr_sizet;
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extern tree int_ftype_int;
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extern tree int_ftype_ptr_ptr_int;
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extern tree int_ftype_string_string;
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extern tree integer_type_node;
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extern tree long_double_type_node;
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extern tree long_ftype_long;
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extern tree long_integer_type_node;
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extern tree long_long_integer_type_node;
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extern tree long_long_unsigned_type_node;
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extern tree long_unsigned_type_node;
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extern tree complex_integer_type_node;
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extern tree complex_float_type_node;
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extern tree complex_double_type_node;
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extern tree complex_long_double_type_node;
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extern tree ptr_type_node;
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extern tree ptrdiff_type_node;
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extern tree short_integer_type_node;
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extern tree short_unsigned_type_node;
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extern tree signed_char_type_node;
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extern tree signed_wchar_type_node;
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extern tree string_ftype_ptr_ptr;
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extern tree string_type_node;
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extern tree unsigned_char_type_node;
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#if HOST_BITS_PER_WIDE_INT >= 64
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extern tree unsigned_intTI_type_node;
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#endif
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extern tree unsigned_intDI_type_node;
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extern tree unsigned_intHI_type_node;
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extern tree unsigned_intQI_type_node;
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extern tree unsigned_intSI_type_node;
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extern tree unsigned_type_node;
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extern tree unsigned_wchar_type_node;
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extern tree void_ftype_ptr_int_int;
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extern tree void_ftype_ptr_ptr_int;
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extern tree void_type_node;
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extern tree wchar_array_type_node;
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extern tree wchar_type_node;
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extern tree boolean_type_node;
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extern tree boolean_true_node;
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extern tree boolean_false_node;
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extern tree build_enumerator PROTO((tree, tree));
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/* Declare a predefined function. Return the declaration. */
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extern tree builtin_function PROTO((const char *, tree, enum built_in_function function_, const char *));
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/* Add qualifiers to a type, in the fashion for C. */
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extern tree c_build_qualified_type PROTO((tree, int));
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#define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
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c_build_qualified_type (TYPE, \
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((CONST_P) ? TYPE_QUAL_CONST : 0) | \
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((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
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extern int c_decode_option PROTO((int, char **));
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extern void c_mark_varargs PROTO((void));
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extern tree check_identifier PROTO((tree, tree));
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extern void clear_parm_order PROTO((void));
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extern tree combine_parm_decls PROTO((tree, tree, int));
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extern int complete_array_type PROTO((tree, tree, int));
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extern void declare_parm_level PROTO((int));
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extern tree define_label PROTO((char *, int, tree));
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extern void delete_block PROTO((tree));
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extern void finish_decl PROTO((tree, tree, tree));
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extern void finish_decl_top_level PROTO((tree, tree, tree));
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extern tree finish_enum PROTO((tree, tree, tree));
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extern void finish_function PROTO((int));
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extern tree finish_struct PROTO((tree, tree, tree));
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extern tree get_parm_info PROTO((int));
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extern tree getdecls PROTO((void));
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extern tree gettags PROTO((void));
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extern int global_bindings_p PROTO((void));
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extern tree grokfield PROTO((const char *, int, tree, tree, tree));
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extern tree groktypename PROTO((tree));
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extern tree groktypename_in_parm_context PROTO((tree));
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extern tree implicitly_declare PROTO((tree));
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extern int in_parm_level_p PROTO((void));
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extern void init_decl_processing PROTO((void));
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extern void insert_block PROTO((tree));
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extern void keep_next_level PROTO((void));
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extern int kept_level_p PROTO((void));
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extern tree lookup_label PROTO((tree));
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extern tree lookup_name PROTO((tree));
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extern tree lookup_name_current_level PROTO((tree));
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extern tree lookup_name_current_level_global PROTO((tree));
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extern tree maybe_build_cleanup PROTO((tree));
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extern void parmlist_tags_warning PROTO((void));
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extern void pending_xref_error PROTO((void));
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extern void pop_c_function_context PROTO((void));
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extern void pop_label_level PROTO((void));
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extern tree poplevel PROTO((int, int, int));
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extern void print_lang_decl PROTO((FILE *, tree, int));
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extern void print_lang_identifier PROTO((FILE *, tree, int));
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extern void print_lang_type PROTO((FILE *, tree, int));
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extern void push_c_function_context PROTO((void));
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extern void push_label_level PROTO((void));
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extern void push_parm_decl PROTO((tree));
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extern tree pushdecl PROTO((tree));
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extern tree pushdecl_top_level PROTO((tree));
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extern void pushlevel PROTO((int));
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extern void pushtag PROTO((tree, tree));
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extern void set_block PROTO((tree));
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extern tree shadow_label PROTO((tree));
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extern void shadow_record_fields PROTO((tree));
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extern void shadow_tag PROTO((tree));
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extern void shadow_tag_warned PROTO((tree, int));
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extern tree start_enum PROTO((tree));
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extern int start_function PROTO((tree, tree, tree,
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tree, int));
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extern tree start_decl PROTO((tree, tree, int,
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tree, tree));
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extern tree start_struct PROTO((enum tree_code, tree));
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extern void store_parm_decls PROTO((void));
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extern tree xref_tag PROTO((enum tree_code, tree));
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/* in c-typeck.c */
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extern tree require_complete_type PROTO((tree));
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extern void incomplete_type_error PROTO((tree, tree));
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/* Given two integer or real types, return the type for their sum.
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Given two compatible ANSI C types, returns the merged type. */
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extern tree common_type PROTO((tree, tree));
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extern int comptypes PROTO((tree, tree));
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extern int self_promoting_args_p PROTO((tree));
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extern tree c_sizeof PROTO((tree));
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extern tree c_sizeof_nowarn PROTO((tree));
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extern tree c_size_in_bytes PROTO((tree));
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extern tree c_alignof PROTO((tree));
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extern tree c_alignof_expr PROTO((tree));
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extern tree default_conversion PROTO((tree));
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extern tree build_component_ref PROTO((tree, tree));
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extern tree build_indirect_ref PROTO((tree, const char *));
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extern tree build_array_ref PROTO((tree, tree));
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extern tree build_function_call PROTO((tree, tree));
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extern tree parser_build_binary_op PROTO((enum tree_code,
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tree, tree));
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extern tree build_binary_op PROTO((enum tree_code,
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tree, tree, int));
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extern tree build_unary_op PROTO((enum tree_code,
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tree, int));
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extern int lvalue_p PROTO((tree));
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extern int lvalue_or_else PROTO((tree, const char *));
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extern void readonly_warning PROTO((tree, const char *));
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extern int mark_addressable PROTO((tree));
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extern tree build_conditional_expr PROTO((tree, tree, tree));
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extern tree build_compound_expr PROTO((tree));
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extern tree build_c_cast PROTO((tree, tree));
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extern tree build_modify_expr PROTO((tree, enum tree_code,
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tree));
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extern tree initializer_constant_valid_p PROTO((tree, tree));
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extern void store_init_value PROTO((tree, tree));
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extern void error_init PROTO((const char *));
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extern void pedwarn_init PROTO((const char *));
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extern void start_init PROTO((tree, tree, int));
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extern void finish_init PROTO((void));
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extern void really_start_incremental_init PROTO((tree));
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extern void push_init_level PROTO((int));
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extern tree pop_init_level PROTO((int));
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extern void set_init_index PROTO((tree, tree));
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extern void set_init_label PROTO((tree));
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extern void process_init_element PROTO((tree));
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extern void c_expand_asm_operands PROTO((tree, tree, tree, tree,
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int, char *, int));
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extern void c_expand_return PROTO((tree));
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extern tree c_expand_start_case PROTO((tree));
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/* in c-iterate.c */
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extern void init_iterators PROTO((void));
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extern void iterator_expand PROTO((tree));
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extern void iterator_for_loop_start PROTO((tree));
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extern void iterator_for_loop_end PROTO((tree));
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extern void iterator_for_loop_record PROTO((tree));
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extern void push_iterator_stack PROTO((void));
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extern void pop_iterator_stack PROTO((void));
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/* Set to 0 at beginning of a function definition, set to 1 if
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a return statement that specifies a return value is seen. */
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extern int current_function_returns_value;
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/* Set to 0 at beginning of a function definition, set to 1 if
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a return statement with no argument is seen. */
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extern int current_function_returns_null;
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|
||
/* Nonzero means the expression being parsed will never be evaluated.
|
||
This is a count, since unevaluated expressions can nest. */
|
||
|
||
extern int skip_evaluation;
|
||
|
||
/* 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 environment is hosted (i.e., not freestanding) */
|
||
|
||
extern int flag_hosted;
|
||
|
||
/* 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 flag_const_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;
|
||
|
||
/* Nonzero means warn when casting a function call to a type that does
|
||
not match the return type (e.g. (float)sqrt() or (anything*)malloc()
|
||
when there is no previous declaration of sqrt or malloc. */
|
||
|
||
extern int warn_bad_function_cast;
|
||
|
||
/* Warn about functions which might be candidates for attribute noreturn. */
|
||
|
||
extern int warn_missing_noreturn;
|
||
|
||
/* 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;
|
||
|
||
/* Warn if main is suspicious. */
|
||
|
||
extern int warn_main;
|
||
|
||
/* Nonzero means do some things the same way PCC does. */
|
||
|
||
extern int flag_traditional;
|
||
|
||
/* Nonzero means use the ISO C9x dialect of C. */
|
||
|
||
extern int flag_isoc9x;
|
||
|
||
/* Nonzero means to allow single precision math even if we're generally
|
||
being traditional. */
|
||
extern int flag_allow_single_precision;
|
||
|
||
/* Nonzero means warn about suggesting putting in ()'s. */
|
||
|
||
extern int warn_parentheses;
|
||
|
||
/* Warn if initializer is not completely bracketed. */
|
||
|
||
extern int warn_missing_braces;
|
||
|
||
/* Warn about comparison of signed and unsigned values. */
|
||
|
||
extern int warn_sign_compare;
|
||
|
||
/* Warn about multicharacter constants. */
|
||
|
||
extern int warn_multichar;
|
||
|
||
/* Warn about long long. */
|
||
|
||
extern int warn_long_long;
|
||
|
||
/* Nonzero means we are reading code that came from a system header file. */
|
||
|
||
extern int system_header_p;
|
||
|
||
/* Nonzero enables objc features. */
|
||
|
||
extern int doing_objc_thang;
|
||
|
||
/* In c-decl.c */
|
||
extern void finish_incomplete_decl PROTO((tree));
|
||
|
||
#endif /* not _C_TREE_H */
|