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 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 global_value;
  41   tree local_value;
  42   tree label_value;
  43   tree implicit_decl;
  44   tree limbo_value;
  45 };
  46
  47 /* The resulting tree type.  */
  48
  49 union lang_tree_node
  50   GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
  51        chain_next ("(union lang_tree_node *)TREE_CHAIN (&%h.generic)")))
  52 {
  53   union tree_node GTY ((tag ("0"),
  54                         desc ("tree_node_structure (&%h)")))
  55     generic;
  56   struct lang_identifier GTY ((tag ("1"))) identifier;
  57 };
  58
  59 /* Language-specific declaration information.  */
  60
  61 struct lang_decl GTY(())
  62 {
  63   struct c_lang_decl base;
  64   /* The return types and parameter types may have variable size.
  65      This is a list of any SAVE_EXPRs that need to be evaluated to
  66      compute those sizes.  */
  67   tree pending_sizes;
  68 };
  69
  70 /* Macros for access to language-specific slots in an identifier.  */
  71 /* Each of these slots contains a DECL node or null.  */
  72
  73 /* This represents the value which the identifier has in the
  74    file-scope namespace.  */
  75 #define IDENTIFIER_GLOBAL_VALUE(NODE)   \
  76   (((struct lang_identifier *) (NODE))->global_value)
  77 /* This represents the value which the identifier has in the current
  78    scope.  */
  79 #define IDENTIFIER_LOCAL_VALUE(NODE)    \
  80   (((struct lang_identifier *) (NODE))->local_value)
  81 /* This represents the value which the identifier has as a label in
  82    the current label scope.  */
  83 #define IDENTIFIER_LABEL_VALUE(NODE)    \
  84   (((struct lang_identifier *) (NODE))->label_value)
  85 /* This records the extern decl of this identifier, if it has had one
  86    at any point in this compilation.  */
  87 #define IDENTIFIER_LIMBO_VALUE(NODE)    \
  88   (((struct lang_identifier *) (NODE))->limbo_value)
  89 /* This records the implicit function decl of this identifier, if it
  90    has had one at any point in this compilation.  */
  91 #define IDENTIFIER_IMPLICIT_DECL(NODE)  \
  92   (((struct lang_identifier *) (NODE))->implicit_decl)
  93
  94 /* In identifiers, C uses the following fields in a special way:
  95    TREE_PUBLIC        to record that there was a previous local extern decl.
  96    TREE_USED          to record that such a decl was used.
  97    TREE_ADDRESSABLE   to record that the address of such a decl was used.  */
  98
  99 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
 100 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
 101
 102 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
 103 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
 104
 105 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
 106    nonzero if the definition of the type has already started.  */
 107 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
 108
 109 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
 110    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
 111    and C_RID_YYCODE is the token number wanted by Yacc.  */
 112 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
 113
 114 /* This function was declared inline.  This flag controls the linkage
 115    semantics of 'inline'; whether or not the function is inlined is
 116    controlled by DECL_INLINE.  */
 117 #define DECL_DECLARED_INLINE_P(NODE) \
 118   (DECL_LANG_SPECIFIC (NODE)->base.declared_inline)
 119
 120 /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
 121 struct lang_type GTY(())
 122 {
 123   int len;
 124   tree GTY((length ("%h.len"))) elts[1];
 125 };
 126
 127 /* Record whether a type or decl was written with nonconstant size.
 128    Note that TYPE_SIZE may have simplified to a constant.  */
 129 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
 130 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
 131
 132 #if 0 /* Not used.  */
 133 /* Record whether a decl for a function or function pointer has
 134    already been mentioned (in a warning) because it was called
 135    but didn't have a prototype.  */
 136 #define C_MISSING_PROTOTYPE_WARNED(DECL) DECL_LANG_FLAG_2 (DECL)
 137 #endif
 138
 139 /* Store a value in that field.  */
 140 #define C_SET_EXP_ORIGINAL_CODE(EXP, CODE) \
 141   (TREE_COMPLEXITY (EXP) = (int) (CODE))
 142
 143 /* Record whether a typedef for type `int' was actually `signed int'.  */
 144 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
 145
 146 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
 147    return type.  */
 148 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
 149
 150 /* Nonzero for a declaration of a built in function if there has been no
 151    occasion that would declare the function in ordinary C.
 152    Using the function draws a pedantic warning in this case.  */
 153 #define C_DECL_ANTICIPATED(EXP) DECL_LANG_FLAG_3 (EXP)
 154
 155 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 156    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 157    without prototypes.  */
 158 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_BINFO (NODE)
 159
 160 \f
 161 /* in c-lang.c and objc-act.c */
 162 extern tree lookup_interface                    PARAMS ((tree));
 163 extern tree is_class_name                       PARAMS ((tree));
 164 extern tree objc_is_id                          PARAMS ((tree));
 165 extern void objc_check_decl                     PARAMS ((tree));
 166 extern void finish_file                         PARAMS ((void));
 167 extern int objc_comptypes                       PARAMS ((tree, tree, int));
 168 extern tree objc_message_selector               PARAMS ((void));
 169 extern tree lookup_objc_ivar                    PARAMS ((tree));
 170 extern void c_expand_body                       PARAMS ((tree));
 171
 172 \f
 173 /* in c-parse.in */
 174 extern void c_parse_init                        PARAMS ((void));
 175
 176 /* in c-aux-info.c */
 177 extern void gen_aux_info_record                 PARAMS ((tree, int, int, int));
 178
 179 /* in c-decl.c */
 180 extern int global_bindings_p                    PARAMS ((void));
 181 extern int kept_level_p                         PARAMS ((void));
 182 extern tree getdecls                            PARAMS ((void));
 183 extern void pushlevel                           PARAMS ((int));
 184 extern tree poplevel                            PARAMS ((int,int, int));
 185 extern void insert_block                        PARAMS ((tree));
 186 extern void set_block                           PARAMS ((tree));
 187 extern tree pushdecl                            PARAMS ((tree));
 188
 189 extern void c_insert_default_attributes         PARAMS ((tree));
 190 extern void c_init_decl_processing              PARAMS ((void));
 191 extern void c_dup_lang_specific_decl            PARAMS ((tree));
 192 extern void c_print_identifier                  PARAMS ((FILE *, tree, int));
 193 extern tree build_array_declarator              PARAMS ((tree, tree, int, int));
 194 extern tree build_enumerator                    PARAMS ((tree, tree));
 195 extern void check_for_loop_decls                PARAMS ((void));
 196 extern void clear_parm_order                    PARAMS ((void));
 197 extern int  complete_array_type                 PARAMS ((tree, tree, int));
 198 extern void declare_parm_level                  PARAMS ((int));
 199 extern tree define_label                        PARAMS ((const char *, int,
 200                                                          tree));
 201 extern void finish_decl                         PARAMS ((tree, tree, tree));
 202 extern tree finish_enum                         PARAMS ((tree, tree, tree));
 203 extern void finish_function                     PARAMS ((int, int));
 204 extern tree finish_struct                       PARAMS ((tree, tree, tree));
 205 extern tree get_parm_info                       PARAMS ((int));
 206 extern tree grokfield                           PARAMS ((const char *, int, tree, tree, tree));
 207 extern tree groktypename                        PARAMS ((tree));
 208 extern tree groktypename_in_parm_context        PARAMS ((tree));
 209 extern tree implicitly_declare                  PARAMS ((tree));
 210 extern void implicit_decl_warning               PARAMS ((tree));
 211 extern int  in_parm_level_p                     PARAMS ((void));
 212 extern void keep_next_level                     PARAMS ((void));
 213 extern tree lookup_name                         PARAMS ((tree));
 214 extern tree lookup_name_current_level           PARAMS ((tree));
 215 extern void parmlist_tags_warning               PARAMS ((void));
 216 extern void pending_xref_error                  PARAMS ((void));
 217 extern void c_push_function_context             PARAMS ((struct function *));
 218 extern void c_pop_function_context              PARAMS ((struct function *));
 219 extern void pop_label_level                     PARAMS ((void));
 220 extern void push_label_level                    PARAMS ((void));
 221 extern void push_parm_decl                      PARAMS ((tree));
 222 extern tree pushdecl_top_level                  PARAMS ((tree));
 223 extern void pushtag                             PARAMS ((tree, tree));
 224 extern void record_function_scope_shadow        PARAMS ((tree));
 225 extern tree set_array_declarator_type           PARAMS ((tree, tree, int));
 226 extern tree shadow_label                        PARAMS ((tree));
 227 extern void shadow_tag                          PARAMS ((tree));
 228 extern void shadow_tag_warned                   PARAMS ((tree, int));
 229 extern tree start_enum                          PARAMS ((tree));
 230 extern int  start_function                      PARAMS ((tree, tree, tree));
 231 extern tree start_decl                          PARAMS ((tree, tree, int,
 232                                                          tree));
 233 extern tree start_struct                        PARAMS ((enum tree_code, tree));
 234 extern void store_parm_decls                    PARAMS ((void));
 235 extern tree xref_tag                            PARAMS ((enum tree_code, tree));
 236 extern tree c_begin_compound_stmt               PARAMS ((void));
 237 extern void c_expand_deferred_function          PARAMS ((tree));
 238 extern void c_expand_decl_stmt                  PARAMS ((tree));
 239 extern tree make_pointer_declarator             PARAMS ((tree, tree));
 240
 241 /* in c-objc-common.c */
 242 extern int c_disregard_inline_limits            PARAMS ((tree));
 243 extern int c_cannot_inline_tree_fn              PARAMS ((tree *));
 244 extern bool c_objc_common_init                  PARAMS ((void));
 245 extern int c_missing_noreturn_ok_p              PARAMS ((tree));
 246 extern void c_objc_common_finish_file           PARAMS ((void));
 247 extern int defer_fn                             PARAMS ((tree));
 248 extern bool c_warn_unused_global_decl           PARAMS ((tree));
 249
 250 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 251   c_build_qualified_type ((TYPE),                                 \
 252                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 253                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 254
 255 #define c_sizeof_nowarn(T)  c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 0)
 256 /* in c-typeck.c */
 257 extern tree require_complete_type               PARAMS ((tree));
 258 extern int comptypes                            PARAMS ((tree, tree));
 259 extern tree c_size_in_bytes                     PARAMS ((tree));
 260 extern bool c_mark_addressable                  PARAMS ((tree));
 261 extern void c_incomplete_type_error             PARAMS ((tree, tree));
 262 extern tree c_type_promotes_to                  PARAMS ((tree));
 263 extern tree build_component_ref                 PARAMS ((tree, tree));
 264 extern tree build_indirect_ref                  PARAMS ((tree, const char *));
 265 extern tree build_array_ref                     PARAMS ((tree, tree));
 266 extern tree build_external_ref                  PARAMS ((tree, int));
 267 extern tree parser_build_binary_op              PARAMS ((enum tree_code,
 268                                                          tree, tree));
 269 extern int c_tree_expr_nonnegative_p            PARAMS ((tree));
 270 extern void readonly_warning                    PARAMS ((tree, const char *));
 271 extern tree build_conditional_expr              PARAMS ((tree, tree, tree));
 272 extern tree build_compound_expr                 PARAMS ((tree));
 273 extern tree c_cast_expr                         PARAMS ((tree, tree));
 274 extern tree build_c_cast                        PARAMS ((tree, tree));
 275 extern tree build_modify_expr                   PARAMS ((tree, enum tree_code,
 276                                                          tree));
 277 extern void store_init_value                    PARAMS ((tree, tree));
 278 extern void error_init                          PARAMS ((const char *));
 279 extern void pedwarn_init                        PARAMS ((const char *));
 280 extern void start_init                          PARAMS ((tree, tree, int));
 281 extern void finish_init                         PARAMS ((void));
 282 extern void really_start_incremental_init       PARAMS ((tree));
 283 extern void push_init_level                     PARAMS ((int));
 284 extern tree pop_init_level                      PARAMS ((int));
 285 extern void set_init_index                      PARAMS ((tree, tree));
 286 extern void set_init_label                      PARAMS ((tree));
 287 extern void process_init_element                PARAMS ((tree));
 288 extern tree build_compound_literal              PARAMS ((tree, tree));
 289 extern void pedwarn_c99                         PARAMS ((const char *, ...))
 290                                                         ATTRIBUTE_PRINTF_1;
 291 extern tree c_start_case                        PARAMS ((tree));
 292 extern void c_finish_case                       PARAMS ((void));
 293 extern tree simple_asm_stmt                     PARAMS ((tree));
 294 extern tree build_asm_stmt                      PARAMS ((tree, tree, tree,
 295                                                          tree, tree));
 296 extern tree c_convert_parm_for_inlining         PARAMS ((tree, tree, tree));
 297
 298 /* Set to 0 at beginning of a function definition, set to 1 if
 299    a return statement that specifies a return value is seen.  */
 300
 301 extern int current_function_returns_value;
 302
 303 /* Set to 0 at beginning of a function definition, set to 1 if
 304    a return statement with no argument is seen.  */
 305
 306 extern int current_function_returns_null;
 307
 308 /* Set to 0 at beginning of a function definition, set to 1 if
 309    a call to a noreturn function is seen.  */
 310
 311 extern int current_function_returns_abnormally;
 312
 313 /* Nonzero means we are reading code that came from a system header file.  */
 314
 315 extern int system_header_p;
 316
 317 /* In c-decl.c */
 318 extern void c_finish_incomplete_decl PARAMS ((tree));
 319
 320 extern GTY(()) tree static_ctors;
 321 extern GTY(()) tree static_dtors;
 322
 323 #endif /* ! GCC_C_TREE_H */