gcc/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
   3    1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #ifndef GCC_C_TREE_H
  23 #define GCC_C_TREE_H
  24
  25 #include "c-common.h"
  26
  27 /* Language-dependent contents of an identifier.  */
  28
  29 /* The limbo_value is used for block level extern declarations, which need
  30    to be type checked against subsequent extern declarations.  They can't
  31    be referenced after they fall out of scope, so they can't be global.
  32
  33    The rid_code field is used for keywords.  It is in all
  34    lang_identifier nodes, because some keywords are only special in a
  35    particular context.  */
  36
  37 struct lang_identifier GTY(())
  38 {
  39   struct c_common_identifier common_id;
  40   tree symbol_value;
  41   tree tag_value;
  42   tree label_value;
  43 };
  44
  45 /* The resulting tree type.  */
  46
  47 union lang_tree_node
  48   GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
  49        chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *)TYPE_NEXT_VARIANT (&%h.generic) : (union lang_tree_node *)TREE_CHAIN (&%h.generic)")))
  50 {
  51   union tree_node GTY ((tag ("0"),
  52                         desc ("tree_node_structure (&%h)")))
  53     generic;
  54   struct lang_identifier GTY ((tag ("1"))) identifier;
  55 };
  56
  57 /* Language-specific declaration information.  */
  58
  59 struct lang_decl GTY(())
  60 {
  61   /* The return types and parameter types may have variable size.
  62      This is a list of any SAVE_EXPRs that need to be evaluated to
  63      compute those sizes.  */
  64   tree pending_sizes;
  65 };
  66
  67 /* Macros for access to language-specific slots in an identifier.  */
  68 /* Each of these slots contains a DECL node or null.  */
  69
  70 /* The value of the identifier in the namespace of "ordinary identifiers"
  71    (data objects, enum constants, functions, typedefs).  */
  72 #define IDENTIFIER_SYMBOL_VALUE(NODE)   \
  73   (((struct lang_identifier *) (NODE))->symbol_value)
  74 /* The value of the identifier in the namespace of struct, union,
  75    and enum tags.  */
  76 #define IDENTIFIER_TAG_VALUE(NODE)      \
  77   (((struct lang_identifier *) (NODE))->tag_value)
  78 /* The value of the identifier in the namespace of labels.  */
  79 #define IDENTIFIER_LABEL_VALUE(NODE)    \
  80   (((struct lang_identifier *) (NODE))->label_value)
  81
  82 /* In identifiers, C uses the following fields in a special way:
  83    TREE_PUBLIC        to record that there was a previous local extern decl.
  84    TREE_USED          to record that such a decl was used.
  85    TREE_ADDRESSABLE   to record that the address of such a decl was used.  */
  86
  87 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  88 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  89
  90 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  91 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  92
  93 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  94    nonzero if the definition of the type has already started.  */
  95 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  96
  97 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
  98    declarations whose type would be completed by completing that type.  */
  99 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
 100
 101 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
 102    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
 103    and C_RID_YYCODE is the token number wanted by Yacc.  */
 104 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
 105
 106 /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
 107 struct lang_type GTY(())
 108 {
 109   struct sorted_fields_type * GTY ((reorder ("resort_sorted_fields"))) s;
 110 };
 111
 112 /* Record whether a type or decl was written with nonconstant size.
 113    Note that TYPE_SIZE may have simplified to a constant.  */
 114 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
 115 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
 116
 117 /* Store a value in that field.  */
 118 #define C_SET_EXP_ORIGINAL_CODE(EXP, CODE) \
 119   (TREE_COMPLEXITY (EXP) = (int) (CODE))
 120
 121 /* Record whether a typedef for type `int' was actually `signed int'.  */
 122 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
 123
 124 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
 125    return type.  */
 126 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
 127
 128 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
 129 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
 130
 131 /* Nonzero for a declaration of an external object which is not
 132    currently in scope.  This is either a built-in declaration of
 133    a library function, before a real declaration has been seen,
 134    or a declaration that appeared in an inner scope that has ended.  */
 135 #define C_DECL_INVISIBLE(EXP) DECL_LANG_FLAG_3 (EXP)
 136
 137 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 138    N.B. Could be simplified if all built-in decls had complete prototypes
 139    (but this is presently difficult because some of them need FILE*).  */
 140 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 141        (EXP == 0                                        \
 142         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 143             && !DECL_BUILT_IN (EXP)))
 144
 145 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 146    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 147    without prototypes.  */
 148 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_BINFO (NODE)
 149
 150 /* Values for the first parameter to poplevel.  */
 151 #define KEEP_NO         0
 152 #define KEEP_YES        1
 153 #define KEEP_MAYBE      2
 154
 155 \f
 156 /* in c-parse.in */
 157 extern void c_parse_init (void);
 158
 159 /* in c-aux-info.c */
 160 extern void gen_aux_info_record (tree, int, int, int);
 161
 162 /* in c-decl.c */
 163 extern int global_bindings_p (void);
 164 extern tree getdecls (void);
 165 extern void pushlevel (int);
 166 extern void insert_block (tree);
 167 extern void set_block (tree);
 168 extern tree pushdecl (tree);
 169 extern void c_expand_body (tree);
 170
 171 extern void c_init_decl_processing (void);
 172 extern void c_dup_lang_specific_decl (tree);
 173 extern void c_print_identifier (FILE *, tree, int);
 174 extern tree build_array_declarator (tree, tree, int, int);
 175 extern tree build_enumerator (tree, tree);
 176 extern void check_for_loop_decls (void);
 177 extern void mark_forward_parm_decls (void);
 178 extern int  complete_array_type (tree, tree, int);
 179 extern void declare_parm_level (void);
 180 extern void undeclared_variable (tree);
 181 extern tree declare_label (tree);
 182 extern tree define_label (location_t, tree);
 183 extern void finish_decl (tree, tree, tree);
 184 extern tree finish_enum (tree, tree, tree);
 185 extern void finish_function (void);
 186 extern tree finish_struct (tree, tree, tree);
 187 extern tree get_parm_info (int);
 188 extern tree grokfield (tree, tree, tree);
 189 extern tree groktypename (tree);
 190 extern tree groktypename_in_parm_context (tree);
 191 extern tree implicitly_declare (tree);
 192 extern int  in_parm_level_p (void);
 193 extern void keep_next_level (void);
 194 extern tree lookup_name (tree);
 195 extern void pending_xref_error (void);
 196 extern void c_push_function_context (struct function *);
 197 extern void c_pop_function_context (struct function *);
 198 extern void push_parm_decl (tree);
 199 extern tree pushdecl_top_level (tree);
 200 extern void pushtag (tree, tree);
 201 extern tree set_array_declarator_type (tree, tree, int);
 202 extern void shadow_tag (tree);
 203 extern void shadow_tag_warned (tree, int);
 204 extern tree start_enum (tree);
 205 extern int  start_function (tree, tree, tree);
 206 extern tree start_decl (tree, tree, int, tree);
 207 extern tree start_struct (enum tree_code, tree);
 208 extern void store_parm_decls (void);
 209 extern tree xref_tag (enum tree_code, tree);
 210 extern tree c_begin_compound_stmt (void);
 211 extern void c_expand_deferred_function (tree);
 212 extern void c_expand_decl_stmt (tree);
 213 extern void c_static_assembler_name (tree);
 214 extern tree make_pointer_declarator (tree, tree);
 215 extern void merge_translation_unit_decls (void);
 216
 217 /* in c-objc-common.c */
 218 extern int c_disregard_inline_limits (tree);
 219 extern int c_cannot_inline_tree_fn (tree *);
 220 extern bool c_objc_common_init (void);
 221 extern int c_missing_noreturn_ok_p (tree);
 222 extern void c_objc_common_finish_file (void);
 223 extern int defer_fn (tree);
 224 extern bool c_warn_unused_global_decl (tree);
 225
 226 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 227   c_build_qualified_type ((TYPE),                                 \
 228                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 229                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 230
 231 #define c_sizeof_nowarn(T)  c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 0)
 232
 233 /* in c-typeck.c */
 234
 235 /* For use with comptypes.  */
 236 enum {
 237   COMPARE_STRICT = 0
 238 };
 239
 240 extern tree require_complete_type (tree);
 241 extern int comptypes (tree, tree, int);
 242 extern tree c_size_in_bytes (tree);
 243 extern bool c_mark_addressable (tree);
 244 extern void c_incomplete_type_error (tree, tree);
 245 extern tree c_type_promotes_to (tree);
 246 extern tree build_component_ref (tree, tree);
 247 extern tree build_indirect_ref (tree, const char *);
 248 extern tree build_array_ref (tree, tree);
 249 extern tree build_external_ref (tree, int);
 250 extern tree parser_build_binary_op (enum tree_code, tree, tree);
 251 extern int c_tree_expr_nonnegative_p (tree);
 252 extern void readonly_warning (tree, const char *);
 253 extern tree build_conditional_expr (tree, tree, tree);
 254 extern tree build_compound_expr (tree);
 255 extern tree c_cast_expr (tree, tree);
 256 extern tree build_c_cast (tree, tree);
 257 extern tree build_modify_expr (tree, enum tree_code, tree);
 258 extern void store_init_value (tree, tree);
 259 extern void error_init (const char *);
 260 extern void pedwarn_init (const char *);
 261 extern void start_init (tree, tree, int);
 262 extern void finish_init (void);
 263 extern void really_start_incremental_init (tree);
 264 extern void push_init_level (int);
 265 extern tree pop_init_level (int);
 266 extern void set_init_index (tree, tree);
 267 extern void set_init_label (tree);
 268 extern void process_init_element (tree);
 269 extern tree build_compound_literal (tree, tree);
 270 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_PRINTF_1;
 271 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_PRINTF_1;
 272 extern tree c_start_case (tree);
 273 extern void c_finish_case (void);
 274 extern tree simple_asm_stmt (tree);
 275 extern tree build_asm_stmt (tree, tree, tree, tree, tree);
 276 extern tree c_convert_parm_for_inlining (tree, tree, tree);
 277
 278 /* Set to 0 at beginning of a function definition, set to 1 if
 279    a return statement that specifies a return value is seen.  */
 280
 281 extern int current_function_returns_value;
 282
 283 /* Set to 0 at beginning of a function definition, set to 1 if
 284    a return statement with no argument is seen.  */
 285
 286 extern int current_function_returns_null;
 287
 288 /* Set to 0 at beginning of a function definition, set to 1 if
 289    a call to a noreturn function is seen.  */
 290
 291 extern int current_function_returns_abnormally;
 292
 293 /* Nonzero means we are reading code that came from a system header file.  */
 294
 295 extern int system_header_p;
 296
 297 /* In c-decl.c */
 298 extern void c_finish_incomplete_decl (tree);
 299 extern void *get_current_scope (void);
 300 extern void objc_mark_locals_volatile (void *);
 301 extern void c_write_global_declarations (void);
 302
 303 extern GTY(()) tree static_ctors;
 304 extern GTY(()) tree static_dtors;
 305
 306 /* In order for the format checking to accept the C frontend
 307    diagnostic framework extensions, you must include this file before
 308    toplev.h, not after.  */
 309 #define GCC_DIAG_STYLE __gcc_cdiag__
 310
 311 #endif /* ! GCC_C_TREE_H */