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- /* Definitions for C parsing and type checking.
- Copyright (C) 1987, 1993 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. */
-
- #ifndef _C_TREE_H
- #define _C_TREE_H
-
- #ifndef STDIO_PROTO
- #ifdef BUFSIZ
- #define STDIO_PROTO(ARGS) PROTO(ARGS)
- #else
- #define STDIO_PROTO(ARGS) ()
- #endif
- #endif
-
- /* 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)
-
- /* 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));
- 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 STDIO_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 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 *));
- extern void c_mark_varargs PROTO((void));
- extern tree check_identifier PROTO((tree, tree));
- extern void clear_parm_order PROTO((void));
- extern tree combine_parm_decls PROTO((tree, tree, int));
- extern int complete_array_type PROTO((tree, tree, int));
- extern void declare_parm_level PROTO((int));
- extern tree define_label PROTO((char *, int, tree));
- extern void delete_block PROTO((tree));
- extern void finish_decl PROTO((tree, tree, tree));
- extern tree finish_enum PROTO((tree, tree));
- extern void finish_function PROTO((int));
- extern tree finish_struct PROTO((tree, tree));
- extern tree get_parm_info PROTO((int));
- extern tree getdecls PROTO((void));
- extern tree gettags PROTO((void));
- extern int global_bindings_p PROTO((void));
- extern tree grokfield PROTO((char *, int, tree, tree, tree));
- extern tree groktypename PROTO((tree));
- extern tree groktypename_in_parm_context PROTO((tree));
- extern tree implicitly_declare PROTO((tree));
- extern int in_parm_level_p PROTO((void));
- extern void init_decl_processing PROTO((void));
- extern void insert_block PROTO((tree));
- extern void keep_next_level PROTO((void));
- extern int kept_level_p PROTO((void));
- extern tree lookup_label PROTO((tree));
- extern tree lookup_name PROTO((tree));
- extern tree lookup_name_current_level PROTO((tree));
- extern tree maybe_build_cleanup PROTO((tree));
- extern void parmlist_tags_warning PROTO((void));
- extern void pending_xref_error PROTO((void));
- extern void pop_c_function_context PROTO((void));
- extern void pop_label_level PROTO((void));
- extern tree poplevel PROTO((int, int, int));
- extern void print_lang_decl STDIO_PROTO((FILE *, tree,
- int));
- extern void print_lang_identifier STDIO_PROTO((FILE *, tree,
- int));
- extern void print_lang_type STDIO_PROTO((FILE *, tree,
- int));
- extern void push_c_function_context PROTO((void));
- extern void push_label_level PROTO((void));
- extern void push_parm_decl PROTO((tree));
- extern tree pushdecl PROTO((tree));
- extern tree pushdecl_top_level PROTO((tree));
- extern void pushlevel PROTO((int));
- extern void pushtag PROTO((tree, tree));
- extern void set_block PROTO((tree));
- extern tree shadow_label PROTO((tree));
- extern void shadow_record_fields PROTO((tree));
- extern void shadow_tag PROTO((tree));
- extern void shadow_tag_warned PROTO((tree, int));
- extern tree start_enum PROTO((tree));
- extern int start_function PROTO((tree, tree, int));
- extern tree start_decl PROTO((tree, tree, int));
- extern tree start_struct PROTO((enum tree_code, tree));
- extern void store_parm_decls PROTO((void));
- extern tree xref_tag PROTO((enum tree_code, tree));
-
- /* in c-typeck.c */
- extern tree build_array_ref PROTO((tree, tree));
- extern tree build_binary_op PROTO((enum tree_code, tree, tree, int));
- extern tree build_c_cast PROTO((tree, tree));
- extern tree build_component_ref PROTO((tree, tree));
- extern tree build_compound_expr PROTO((tree));
- extern tree build_conditional_expr PROTO((tree, tree, tree));
- extern tree build_function_call PROTO((tree, tree));
- extern tree build_indirect_ref PROTO((tree, char *));
- extern tree build_modify_expr PROTO((tree, enum tree_code, tree));
- extern tree build_unary_op PROTO((enum tree_code, tree, int));
- extern tree c_alignof PROTO((tree));
- extern tree c_alignof_expr PROTO((tree));
- extern tree c_sizeof PROTO((tree));
- extern tree c_expand_start_case PROTO((tree));
- /* 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 PROTO((tree, tree));
- extern tree default_conversion PROTO((tree));
- extern tree parser_build_binary_op PROTO((enum tree_code, tree, tree));
- extern tree require_complete_type PROTO((tree));
- extern void store_init_value PROTO((tree, tree));
- extern void start_init PROTO((tree, tree, int));
- extern void finish_init PROTO((void));
- extern void really_start_incremental_init PROTO((tree));
- extern void push_init_level PROTO((int));
- extern tree pop_init_level PROTO((int));
- extern void set_init_index PROTO((tree, tree));
- extern void set_init_label PROTO((tree));
- extern void process_init_element PROTO((tree));
-
- /* in c-iterate.c */
- extern void iterator_expand PROTO((tree));
- extern void iterator_for_loop_start PROTO((tree));
- extern void iterator_for_loop_end PROTO((tree));
- extern void iterator_for_loop_record PROTO((tree));
- extern void push_iterator_stack PROTO((void));
- extern void pop_iterator_stack PROTO((void));
-
- /* 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 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 */
-