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 ("(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   int len;
 113   tree GTY((length ("%h.len"))) elts[1];
 114 };
 115
 116 /* Record whether a type or decl was written with nonconstant size.
 117    Note that TYPE_SIZE may have simplified to a constant.  */
 118 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
 119 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
 120
 121 /* Store a value in that field.  */
 122 #define C_SET_EXP_ORIGINAL_CODE(EXP, CODE) \
 123   (TREE_COMPLEXITY (EXP) = (int) (CODE))
 124
 125 /* Record whether a typedef for type `int' was actually `signed int'.  */
 126 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
 127
 128 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
 129    return type.  */
 130 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
 131
 132 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
 133 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
 134
 135 /* Nonzero for a declaration of an external object which is not
 136    currently in scope.  This is either a built-in declaration of
 137    a library function, before a real declaration has been seen,
 138    or a declaration that appeared in an inner scope that has ended.  */
 139 #define C_DECL_INVISIBLE(EXP) DECL_LANG_FLAG_3 (EXP)
 140
 141 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 142    N.B. Could be simplified if all built-in decls had complete prototypes
 143    (but this is presently difficult because some of them need FILE*).  */
 144 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 145        (EXP == 0                                        \
 146         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 147             && !DECL_BUILT_IN (EXP)))
 148
 149 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 150    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 151    without prototypes.  */
 152 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_BINFO (NODE)
 153
 154 \f
 155 /* in c-lang.c and objc-act.c */
 156 extern tree lookup_interface (tree);
 157 extern tree is_class_name (tree);
 158 extern tree objc_is_id (tree);
 159 extern void objc_check_decl (tree);
 160 extern void finish_file (void);
 161 extern int objc_comptypes (tree, tree, int);
 162 extern tree objc_message_selector (void);
 163 extern tree lookup_objc_ivar (tree);
 164 extern void c_expand_body (tree);
 165
 166 \f
 167 /* in c-parse.in */
 168 extern void c_parse_init (void);
 169
 170 /* in c-aux-info.c */
 171 extern void gen_aux_info_record (tree, int, int, int);
 172
 173 /* in c-decl.c */
 174 extern int global_bindings_p (void);
 175 extern int kept_level_p (void);
 176 extern tree getdecls (void);
 177 extern void pushlevel (int);
 178 extern void insert_block (tree);
 179 extern void set_block (tree);
 180 extern tree pushdecl (tree);
 181
 182 extern void c_insert_default_attributes (tree);
 183 extern void c_init_decl_processing (void);
 184 extern void c_dup_lang_specific_decl (tree);
 185 extern void c_print_identifier (FILE *, tree, int);
 186 extern tree build_array_declarator (tree, tree, int, int);
 187 extern tree build_enumerator (tree, tree);
 188 extern void check_for_loop_decls (void);
 189 extern void clear_parm_order (void);
 190 extern int  complete_array_type (tree, tree, int);
 191 extern void declare_parm_level (int);
 192 extern tree define_label (location_t, tree);
 193 extern void finish_decl (tree, tree, tree);
 194 extern tree finish_enum (tree, tree, tree);
 195 extern void finish_function (int, int);
 196 extern tree finish_struct (tree, tree, tree);
 197 extern tree get_parm_info (int);
 198 extern tree grokfield (tree, tree, tree);
 199 extern tree groktypename (tree);
 200 extern tree groktypename_in_parm_context (tree);
 201 extern tree implicitly_declare (tree);
 202 extern int  in_parm_level_p (void);
 203 extern void keep_next_level (void);
 204 extern tree lookup_name (tree);
 205 extern void parmlist_tags_warning (void);
 206 extern void pending_xref_error (void);
 207 extern void c_push_function_context (struct function *);
 208 extern void c_pop_function_context (struct function *);
 209 extern void pop_label_level (void);
 210 extern void push_label_level (void);
 211 extern void push_parm_decl (tree);
 212 extern tree pushdecl_top_level (tree);
 213 extern tree pushdecl_function_level (tree, tree);
 214 extern void pushtag (tree, tree);
 215 extern tree set_array_declarator_type (tree, tree, int);
 216 extern tree shadow_label (tree);
 217 extern void shadow_tag (tree);
 218 extern void shadow_tag_warned (tree, int);
 219 extern tree start_enum (tree);
 220 extern int  start_function (tree, tree, tree);
 221 extern tree start_decl (tree, tree, int, tree);
 222 extern tree start_struct (enum tree_code, tree);
 223 extern void store_parm_decls (void);
 224 extern tree xref_tag (enum tree_code, tree);
 225 extern tree c_begin_compound_stmt (void);
 226 extern void c_expand_deferred_function (tree);
 227 extern void c_expand_decl_stmt (tree);
 228 extern tree make_pointer_declarator (tree, tree);
 229
 230 /* in c-objc-common.c */
 231 extern int c_disregard_inline_limits (tree);
 232 extern int c_cannot_inline_tree_fn (tree *);
 233 extern bool c_objc_common_init (void);
 234 extern int c_missing_noreturn_ok_p (tree);
 235 extern void c_objc_common_finish_file (void);
 236 extern int defer_fn (tree);
 237 extern bool c_warn_unused_global_decl (tree);
 238
 239 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 240   c_build_qualified_type ((TYPE),                                 \
 241                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 242                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 243
 244 #define c_sizeof_nowarn(T)  c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 0)
 245 /* in c-typeck.c */
 246 extern tree require_complete_type (tree);
 247 extern int comptypes (tree, tree);
 248 extern tree c_size_in_bytes (tree);
 249 extern bool c_mark_addressable (tree);
 250 extern void c_incomplete_type_error (tree, tree);
 251 extern tree c_type_promotes_to (tree);
 252 extern tree build_component_ref (tree, tree);
 253 extern tree build_indirect_ref (tree, const char *);
 254 extern tree build_array_ref (tree, tree);
 255 extern tree build_external_ref (tree, int);
 256 extern tree parser_build_binary_op (enum tree_code, tree, tree);
 257 extern int c_tree_expr_nonnegative_p (tree);
 258 extern void readonly_warning (tree, const char *);
 259 extern tree build_conditional_expr (tree, tree, tree);
 260 extern tree build_compound_expr (tree);
 261 extern tree c_cast_expr (tree, tree);
 262 extern tree build_c_cast (tree, tree);
 263 extern tree build_modify_expr (tree, enum tree_code, tree);
 264 extern void store_init_value (tree, tree);
 265 extern void error_init (const char *);
 266 extern void pedwarn_init (const char *);
 267 extern void start_init (tree, tree, int);
 268 extern void finish_init (void);
 269 extern void really_start_incremental_init (tree);
 270 extern void push_init_level (int);
 271 extern tree pop_init_level (int);
 272 extern void set_init_index (tree, tree);
 273 extern void set_init_label (tree);
 274 extern void process_init_element (tree);
 275 extern tree build_compound_literal (tree, tree);
 276 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_PRINTF_1;
 277 extern tree c_start_case (tree);
 278 extern void c_finish_case (void);
 279 extern tree simple_asm_stmt (tree);
 280 extern tree build_asm_stmt (tree, tree, tree, tree, tree);
 281 extern tree c_convert_parm_for_inlining (tree, tree, tree);
 282
 283 /* Set to 0 at beginning of a function definition, set to 1 if
 284    a return statement that specifies a return value is seen.  */
 285
 286 extern int current_function_returns_value;
 287
 288 /* Set to 0 at beginning of a function definition, set to 1 if
 289    a return statement with no argument is seen.  */
 290
 291 extern int current_function_returns_null;
 292
 293 /* Set to 0 at beginning of a function definition, set to 1 if
 294    a call to a noreturn function is seen.  */
 295
 296 extern int current_function_returns_abnormally;
 297
 298 /* Nonzero means we are reading code that came from a system header file.  */
 299
 300 extern int system_header_p;
 301
 302 /* In c-decl.c */
 303 extern void c_finish_incomplete_decl (tree);
 304
 305 extern GTY(()) tree static_ctors;
 306 extern GTY(()) tree static_dtors;
 307
 308 /* In order for the format checking to accept the C frontend
 309    diagnostic framework extensions, you must include this file before
 310    toplev.h, not after.  */
 311 #define GCC_DIAG_STYLE __gcc_cdiag__
 312
 313 #endif /* ! GCC_C_TREE_H */