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 /* Save and restore the variables in this file and elsewhere
 156    that keep track of the progress of compilation of the current function.
 157    Used for nested functions.  */
 158
 159 struct language_function GTY(())
 160 {
 161   struct c_language_function base;
 162   int returns_value;
 163   int returns_null;
 164   int returns_abnormally;
 165   int warn_about_return_type;
 166   int extern_inline;
 167   int x_in_iteration_stmt;
 168   int x_in_case_stmt;
 169 };
 170
 171 \f
 172 /* in c-parse.in */
 173 extern void c_parse_init (void);
 174
 175 /* in c-aux-info.c */
 176 extern void gen_aux_info_record (tree, int, int, int);
 177
 178 /* in c-decl.c */
 179 extern int global_bindings_p (void);
 180 extern tree getdecls (void);
 181 extern void pushlevel (int);
 182 extern void insert_block (tree);
 183 extern void set_block (tree);
 184 extern tree pushdecl (tree);
 185 extern void c_expand_body (tree);
 186
 187 extern void c_init_decl_processing (void);
 188 extern void c_dup_lang_specific_decl (tree);
 189 extern void c_print_identifier (FILE *, tree, int);
 190 extern tree build_array_declarator (tree, tree, int, int);
 191 extern tree build_enumerator (tree, tree);
 192 extern void check_for_loop_decls (void);
 193 extern void mark_forward_parm_decls (void);
 194 extern int  complete_array_type (tree, tree, int);
 195 extern void declare_parm_level (void);
 196 extern void undeclared_variable (tree);
 197 extern tree declare_label (tree);
 198 extern tree define_label (location_t, tree);
 199 extern void finish_decl (tree, tree, tree);
 200 extern tree finish_enum (tree, tree, tree);
 201 extern void finish_function (void);
 202 extern tree finish_struct (tree, tree, tree);
 203 extern tree get_parm_info (int);
 204 extern tree grokfield (tree, tree, tree);
 205 extern tree groktypename (tree);
 206 extern tree groktypename_in_parm_context (tree);
 207 extern tree implicitly_declare (tree);
 208 extern int  in_parm_level_p (void);
 209 extern void keep_next_level (void);
 210 extern tree lookup_name (tree);
 211 extern void pending_xref_error (void);
 212 extern void c_push_function_context (struct function *);
 213 extern void c_pop_function_context (struct function *);
 214 extern void push_parm_decl (tree);
 215 extern tree pushdecl_top_level (tree);
 216 extern void pushtag (tree, tree);
 217 extern tree set_array_declarator_type (tree, tree, int);
 218 extern void shadow_tag (tree);
 219 extern void shadow_tag_warned (tree, int);
 220 extern tree start_enum (tree);
 221 extern int  start_function (tree, tree, tree);
 222 extern tree start_decl (tree, tree, int, tree);
 223 extern tree start_struct (enum tree_code, tree);
 224 extern void store_parm_decls (void);
 225 extern tree xref_tag (enum tree_code, tree);
 226 extern tree c_begin_compound_stmt (void);
 227 extern void c_expand_deferred_function (tree);
 228 extern void c_expand_decl_stmt (tree);
 229 extern void c_static_assembler_name (tree);
 230 extern tree make_pointer_declarator (tree, tree);
 231 extern void merge_translation_unit_decls (void);
 232
 233 /* in c-objc-common.c */
 234 extern int c_disregard_inline_limits (tree);
 235 extern int c_cannot_inline_tree_fn (tree *);
 236 extern bool c_objc_common_init (void);
 237 extern int c_missing_noreturn_ok_p (tree);
 238 extern void c_objc_common_finish_file (void);
 239 extern int defer_fn (tree);
 240 extern bool c_warn_unused_global_decl (tree);
 241
 242 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 243   c_build_qualified_type ((TYPE),                                 \
 244                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 245                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 246
 247 #define c_sizeof_nowarn(T)  c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 0)
 248
 249 /* in c-typeck.c */
 250
 251 /* For use with comptypes.  */
 252 enum {
 253   COMPARE_STRICT = 0
 254 };
 255
 256 extern tree require_complete_type (tree);
 257 extern int comptypes (tree, tree, int);
 258 extern tree c_size_in_bytes (tree);
 259 extern bool c_mark_addressable (tree);
 260 extern void c_incomplete_type_error (tree, tree);
 261 extern tree c_type_promotes_to (tree);
 262 extern tree build_component_ref (tree, tree);
 263 extern tree build_indirect_ref (tree, const char *);
 264 extern tree build_array_ref (tree, tree);
 265 extern tree build_external_ref (tree, int);
 266 extern tree parser_build_binary_op (enum tree_code, tree, tree);
 267 extern int c_tree_expr_nonnegative_p (tree);
 268 extern void readonly_warning (tree, const char *);
 269 extern tree build_conditional_expr (tree, tree, tree);
 270 extern tree build_compound_expr (tree);
 271 extern tree c_cast_expr (tree, tree);
 272 extern tree build_c_cast (tree, tree);
 273 extern tree build_modify_expr (tree, enum tree_code, tree);
 274 extern void store_init_value (tree, tree);
 275 extern void error_init (const char *);
 276 extern void pedwarn_init (const char *);
 277 extern void start_init (tree, tree, int);
 278 extern void finish_init (void);
 279 extern void really_start_incremental_init (tree);
 280 extern void push_init_level (int);
 281 extern tree pop_init_level (int);
 282 extern void set_init_index (tree, tree);
 283 extern void set_init_label (tree);
 284 extern void process_init_element (tree);
 285 extern tree build_compound_literal (tree, tree);
 286 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_PRINTF_1;
 287 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_PRINTF_1;
 288 extern tree c_start_case (tree);
 289 extern void c_finish_case (void);
 290 extern tree simple_asm_stmt (tree);
 291 extern tree build_asm_stmt (tree, tree, tree, tree, tree);
 292 extern tree c_convert_parm_for_inlining (tree, tree, tree, int);
 293
 294 /* Set to 0 at beginning of a function definition, set to 1 if
 295    a return statement that specifies a return value is seen.  */
 296
 297 extern int current_function_returns_value;
 298
 299 /* Set to 0 at beginning of a function definition, set to 1 if
 300    a return statement with no argument is seen.  */
 301
 302 extern int current_function_returns_null;
 303
 304 /* Set to 0 at beginning of a function definition, set to 1 if
 305    a call to a noreturn function is seen.  */
 306
 307 extern int current_function_returns_abnormally;
 308
 309 /* Nonzero means we are reading code that came from a system header file.  */
 310
 311 extern int system_header_p;
 312
 313 /* In c-decl.c */
 314 extern void c_finish_incomplete_decl (tree);
 315 extern void *get_current_scope (void);
 316 extern void objc_mark_locals_volatile (void *);
 317 extern void c_write_global_declarations (void);
 318
 319 extern GTY(()) tree static_ctors;
 320 extern GTY(()) tree static_dtors;
 321
 322 /* In order for the format checking to accept the C frontend
 323    diagnostic framework extensions, you must include this file before
 324    toplev.h, not after.  */
 325 #define GCC_DIAG_STYLE __gcc_cdiag__
 326
 327 #endif /* ! GCC_C_TREE_H */