2795803eaf
attribute. It is like the existing "printf" archetype, except that it doesn't complain if the format string is a null pointer. See the node "Function Attributes" in the GCC info pages if you don't know what this is all about. This change will allow us to add format string checking for the err(3) family of functions.
491 lines
21 KiB
C
491 lines
21 KiB
C
/* Definitions for C parsing and type checking.
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Copyright (C) 1987, 1993, 1994, 1995 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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#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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/* 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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/* 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 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, 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 record_function_format PROTO((tree, tree, int, int, int, int));
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extern void check_function_format PROTO((tree, tree, 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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/* 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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extern char *get_directive_line STDIO_PROTO((FILE *));
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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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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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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((char *, tree, enum built_in_function function_, char *));
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/* Add qualifiers to a type, in the fashion for C. */
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extern tree c_build_type_variant PROTO((tree, int, int));
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extern int c_decode_option PROTO((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((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 STDIO_PROTO((FILE *, tree,
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int));
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extern void print_lang_identifier STDIO_PROTO((FILE *, tree,
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int));
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extern void print_lang_type STDIO_PROTO((FILE *, tree,
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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, 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, char *));
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extern void readonly_warning PROTO((tree, 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((char *, char *,
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char *));
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extern void pedwarn_init PROTO((char *, char *,
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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 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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||
|
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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;
|
||
|
||
/* Set to 0 at beginning of a function definition, set to 1 if
|
||
a return statement with no argument is seen. */
|
||
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extern int current_function_returns_null;
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||
|
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/* 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;
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||
|
||
/* Nonzero means don't recognize the keyword `asm'. */
|
||
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||
extern int flag_no_asm;
|
||
|
||
/* Nonzero means ignore `#ident' directives. */
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||
|
||
extern int flag_no_ident;
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||
|
||
/* Nonzero means warn about implicit declarations. */
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extern int warn_implicit;
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/* Nonzero means give string constants the type `const char *'
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to get extra warnings from them. These warnings will be too numerous
|
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to be useful, except in thoroughly ANSIfied programs. */
|
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extern int warn_write_strings;
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|
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/* Nonzero means warn about sizeof (function) or addition/subtraction
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of function pointers. */
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extern int warn_pointer_arith;
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/* Nonzero means warn for all old-style non-prototype function decls. */
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extern int warn_strict_prototypes;
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/* Nonzero means warn about multiple (redundant) decls for the same single
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variable or function. */
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extern int warn_redundant_decls;
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/* Nonzero means warn about extern declarations of objects not at
|
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file-scope level and about *all* declarations of functions (whether
|
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extern or static) not at file-scope level. Note that we exclude
|
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implicit function declarations. To get warnings about those, use
|
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-Wimplicit. */
|
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extern int warn_nested_externs;
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||
/* 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 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 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;
|
||
|
||
/* 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;
|
||
|
||
/* Nonzero enables objc features. */
|
||
|
||
extern int doing_objc_thang;
|
||
|
||
#endif /* not _C_TREE_H */
|