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   struct c_lang_decl base;
  62   /* The return types and parameter types may have variable size.
  63      This is a list of any SAVE_EXPRs that need to be evaluated to
  64      compute those sizes.  */
  65   tree pending_sizes;
  66 };
  67
  68 /* Macros for access to language-specific slots in an identifier.  */
  69 /* Each of these slots contains a DECL node or null.  */
  70
  71 /* The value of the identifier in the namespace of "ordinary identifiers"
  72    (data objects, enum constants, functions, typedefs).  */
  73 #define IDENTIFIER_SYMBOL_VALUE(NODE)   \
  74   (((struct lang_identifier *) (NODE))->symbol_value)
  75 /* The value of the identifier in the namespace of struct, union,
  76    and enum tags.  */
  77 #define IDENTIFIER_TAG_VALUE(NODE)      \
  78   (((struct lang_identifier *) (NODE))->tag_value)
  79 /* The value of the identifier in the namespace of labels.  */
  80 #define IDENTIFIER_LABEL_VALUE(NODE)    \
  81   (((struct lang_identifier *) (NODE))->label_value)
  82
  83 /* In identifiers, C uses the following fields in a special way:
  84    TREE_PUBLIC        to record that there was a previous local extern decl.
  85    TREE_USED          to record that such a decl was used.
  86    TREE_ADDRESSABLE   to record that the address of such a decl was used.  */
  87
  88 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  89 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  90
  91 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  92 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  93
  94 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  95    nonzero if the definition of the type has already started.  */
  96 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  97
  98 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
  99    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
 100    and C_RID_YYCODE is the token number wanted by Yacc.  */
 101 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
 102
 103 /* This function was declared inline.  This flag controls the linkage
 104    semantics of 'inline'; whether or not the function is inlined is
 105    controlled by DECL_INLINE.  */
 106 #define DECL_DECLARED_INLINE_P(NODE) \
 107   (DECL_LANG_SPECIFIC (NODE)->base.declared_inline)
 108
 109 /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
 110 struct lang_type GTY(())
 111 {
 112   struct sorted_fields_type * GTY ((reorder ("resort_sorted_fields"))) s;
 113 };
 114
 115 /* Record whether a type or decl was written with nonconstant size.
 116    Note that TYPE_SIZE may have simplified to a constant.  */
 117 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
 118 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
 119
 120 /* Store a value in that field.  */
 121 #define C_SET_EXP_ORIGINAL_CODE(EXP, CODE) \
 122   (TREE_COMPLEXITY (EXP) = (int) (CODE))
 123
 124 /* Record whether a typedef for type `int' was actually `signed int'.  */
 125 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
 126
 127 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
 128    return type.  */
 129 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
 130
 131 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
 132 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
 133
 134 /* Nonzero for a declaration of an external object which is not
 135    currently in scope.  This is either a built-in declaration of
 136    a library function, before a real declaration has been seen,
 137    or a declaration that appeared in an inner scope that has ended.  */
 138 #define C_DECL_INVISIBLE(EXP) DECL_LANG_FLAG_3 (EXP)
 139
 140 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 141    N.B. Could be simplified if all built-in decls had complete prototypes
 142    (but this is presently difficult because some of them need FILE*).  */
 143 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 144        (EXP == 0                                        \
 145         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 146             && !DECL_BUILT_IN (EXP)))
 147
 148 /* Nonzero for a decl which is at file scope.  */
 149 #define C_DECL_FILE_SCOPE(EXP)                                  \
 150   (! DECL_CONTEXT (EXP)                                         \
 151    || TREE_CODE (DECL_CONTEXT (EXP)) == TRANSLATION_UNIT_DECL)
 152
 153 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 154    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 155    without prototypes.  */
 156 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_BINFO (NODE)
 157
 158 /* Values for the first parameter to poplevel.  */
 159 #define KEEP_NO         0
 160 #define KEEP_YES        1
 161 #define KEEP_MAYBE      2
 162
 163 \f
 164 /* in c-lang.c and objc-act.c */
 165 extern tree lookup_interface (tree);
 166 extern tree is_class_name (tree);
 167 extern tree objc_is_id (tree);
 168 extern void objc_check_decl (tree);
 169 extern int objc_comptypes (tree, tree, int);
 170 extern tree objc_message_selector (void);
 171 extern tree lookup_objc_ivar (tree);
 172 extern void c_expand_body (tree);
 173
 174 \f
 175 /* in c-parse.in */
 176 extern void c_parse_init (void);
 177
 178 /* in c-aux-info.c */
 179 extern void gen_aux_info_record (tree, int, int, int);
 180
 181 /* in c-decl.c */
 182 extern int global_bindings_p (void);
 183 extern tree getdecls (void);
 184 extern void pushlevel (int);
 185 extern void insert_block (tree);
 186 extern void set_block (tree);
 187 extern tree pushdecl (tree);
 188
 189 extern void c_insert_default_attributes (tree);
 190 extern void c_init_decl_processing (void);
 191 extern void c_dup_lang_specific_decl (tree);
 192 extern void c_print_identifier (FILE *, tree, int);
 193 extern tree build_array_declarator (tree, tree, int, int);
 194 extern tree build_enumerator (tree, tree);
 195 extern void check_for_loop_decls (void);
 196 extern void clear_parm_order (void);
 197 extern int  complete_array_type (tree, tree, int);
 198 extern void declare_parm_level (void);
 199 extern void undeclared_variable (tree);
 200 extern tree declare_label (tree);
 201 extern tree define_label (location_t, tree);
 202 extern void finish_decl (tree, tree, tree);
 203 extern tree finish_enum (tree, tree, tree);
 204 extern void finish_function (int, int);
 205 extern tree finish_struct (tree, tree, tree);
 206 extern tree get_parm_info (int);
 207 extern tree grokfield (tree, tree, tree);
 208 extern tree groktypename (tree);
 209 extern tree groktypename_in_parm_context (tree);
 210 extern tree implicitly_declare (tree);
 211 extern int  in_parm_level_p (void);
 212 extern void keep_next_level (void);
 213 extern tree lookup_name (tree);
 214 extern void parmlist_tags_warning (void);
 215 extern void pending_xref_error (void);
 216 extern void c_push_function_context (struct function *);
 217 extern void c_pop_function_context (struct function *);
 218 extern void push_parm_decl (tree);
 219 extern tree pushdecl_top_level (tree);
 220 extern void pushtag (tree, tree);
 221 extern tree set_array_declarator_type (tree, tree, int);
 222 extern void shadow_tag (tree);
 223 extern void shadow_tag_warned (tree, int);
 224 extern tree start_enum (tree);
 225 extern int  start_function (tree, tree, tree);
 226 extern tree start_decl (tree, tree, int, tree);
 227 extern tree start_struct (enum tree_code, tree);
 228 extern void store_parm_decls (void);
 229 extern tree xref_tag (enum tree_code, tree);
 230 extern tree c_begin_compound_stmt (void);
 231 extern void c_expand_deferred_function (tree);
 232 extern void c_expand_decl_stmt (tree);
 233 extern void c_static_assembler_name (tree);
 234 extern tree make_pointer_declarator (tree, tree);
 235 extern void merge_translation_unit_decls (void);
 236
 237 /* in c-objc-common.c */
 238 extern int c_disregard_inline_limits (tree);
 239 extern int c_cannot_inline_tree_fn (tree *);
 240 extern bool c_objc_common_init (void);
 241 extern int c_missing_noreturn_ok_p (tree);
 242 extern void c_objc_common_finish_file (void);
 243 extern int defer_fn (tree);
 244 extern bool c_warn_unused_global_decl (tree);
 245
 246 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 247   c_build_qualified_type ((TYPE),                                 \
 248                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 249                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 250
 251 #define c_sizeof_nowarn(T)  c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 0)
 252
 253 /* in c-typeck.c */
 254
 255 /* For use with comptypes.  */
 256 enum {
 257   COMPARE_STRICT = 0,
 258   COMPARE_DIFFERENT_TU = 1
 259 };
 260
 261 extern tree require_complete_type (tree);
 262 extern int comptypes (tree, tree, int);
 263 extern tree c_size_in_bytes (tree);
 264 extern bool c_mark_addressable (tree);
 265 extern void c_incomplete_type_error (tree, tree);
 266 extern tree c_type_promotes_to (tree);
 267 extern tree build_component_ref (tree, tree);
 268 extern tree build_indirect_ref (tree, const char *);
 269 extern tree build_array_ref (tree, tree);
 270 extern tree build_external_ref (tree, int);
 271 extern tree parser_build_binary_op (enum tree_code, tree, tree);
 272 extern int c_tree_expr_nonnegative_p (tree);
 273 extern void readonly_warning (tree, const char *);
 274 extern tree build_conditional_expr (tree, tree, tree);
 275 extern tree build_compound_expr (tree);
 276 extern tree c_cast_expr (tree, tree);
 277 extern tree build_c_cast (tree, tree);
 278 extern tree build_modify_expr (tree, enum tree_code, tree);
 279 extern void store_init_value (tree, tree);
 280 extern void error_init (const char *);
 281 extern void pedwarn_init (const char *);
 282 extern void start_init (tree, tree, int);
 283 extern void finish_init (void);
 284 extern void really_start_incremental_init (tree);
 285 extern void push_init_level (int);
 286 extern tree pop_init_level (int);
 287 extern void set_init_index (tree, tree);
 288 extern void set_init_label (tree);
 289 extern void process_init_element (tree);
 290 extern tree build_compound_literal (tree, tree);
 291 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_PRINTF_1;
 292 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_PRINTF_1;
 293 extern tree c_start_case (tree);
 294 extern void c_finish_case (void);
 295 extern tree simple_asm_stmt (tree);
 296 extern tree build_asm_stmt (tree, tree, tree, tree, tree);
 297 extern tree c_convert_parm_for_inlining (tree, tree, tree);
 298
 299 /* Set to 0 at beginning of a function definition, set to 1 if
 300    a return statement that specifies a return value is seen.  */
 301
 302 extern int current_function_returns_value;
 303
 304 /* Set to 0 at beginning of a function definition, set to 1 if
 305    a return statement with no argument is seen.  */
 306
 307 extern int current_function_returns_null;
 308
 309 /* Set to 0 at beginning of a function definition, set to 1 if
 310    a call to a noreturn function is seen.  */
 311
 312 extern int current_function_returns_abnormally;
 313
 314 /* Nonzero means we are reading code that came from a system header file.  */
 315
 316 extern int system_header_p;
 317
 318 /* In c-decl.c */
 319 extern void c_finish_incomplete_decl (tree);
 320 extern void c_write_global_declarations (void);
 321
 322 extern GTY(()) tree static_ctors;
 323 extern GTY(()) tree static_dtors;
 324
 325 /* In order for the format checking to accept the C frontend
 326    diagnostic framework extensions, you must include this file before
 327    toplev.h, not after.  */
 328 #define GCC_DIAG_STYLE __gcc_cdiag__
 329
 330 #endif /* ! GCC_C_TREE_H */