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, 2004 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 /* Each C symbol points to three linked lists of c_binding structures.
  28    These describe the values of the identifier in the three different
  29    namespaces defined by the language.  The contents of these lists
  30    are private to c-decl.c.  */
  31
  32 struct c_binding;
  33
  34 /* Language-dependent contents of an identifier.  */
  35
  36 struct lang_identifier GTY(())
  37 {
  38   struct c_common_identifier common_id;
  39   struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
  40   struct c_binding *tag_binding;    /* struct/union/enum tags */
  41   struct c_binding *label_binding;  /* labels */
  42 };
  43
  44 /* The resulting tree type.  */
  45
  46 union lang_tree_node
  47   GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
  48        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)")))
  49 {
  50   union tree_node GTY ((tag ("0"),
  51                         desc ("tree_node_structure (&%h)")))
  52     generic;
  53   struct lang_identifier GTY ((tag ("1"))) identifier;
  54 };
  55
  56 /* Language-specific declaration information.  */
  57
  58 struct lang_decl GTY(())
  59 {
  60   /* The return types and parameter types may have variable size.
  61      This is a list of any SAVE_EXPRs that need to be evaluated to
  62      compute those sizes.  */
  63   tree pending_sizes;
  64 };
  65
  66 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  67 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  68
  69 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  70 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  71
  72 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  73    nonzero if the definition of the type has already started.  */
  74 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  75
  76 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
  77    declarations whose type would be completed by completing that type.  */
  78 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
  79
  80 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
  81    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
  82    and C_RID_YYCODE is the token number wanted by Yacc.  */
  83 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
  84
  85 /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
  86 struct lang_type GTY(())
  87 {
  88   struct sorted_fields_type * GTY ((reorder ("resort_sorted_fields"))) s;
  89 };
  90
  91 /* Record whether a type or decl was written with nonconstant size.
  92    Note that TYPE_SIZE may have simplified to a constant.  */
  93 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
  94 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
  95
  96 /* Store a value in that field.  */
  97 #define C_SET_EXP_ORIGINAL_CODE(EXP, CODE) \
  98   (TREE_COMPLEXITY (EXP) = (int) (CODE))
  99
 100 /* Record whether a typedef for type `int' was actually `signed int'.  */
 101 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
 102
 103 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
 104    return type.  */
 105 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
 106
 107 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
 108 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
 109
 110 /* For any decl, nonzero if it is bound in the externals scope and
 111    pop_scope mustn't chain it into any higher block.  */
 112 #define C_DECL_IN_EXTERNAL_SCOPE(EXP) DECL_LANG_FLAG_3 (EXP)
 113
 114 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
 115    been declared.  */
 116 #define C_DECL_DECLARED_BUILTIN(EXP) DECL_LANG_FLAG_4 (EXP)
 117
 118 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 119    N.B. Could be simplified if all built-in decls had complete prototypes
 120    (but this is presently difficult because some of them need FILE*).  */
 121 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 122        (EXP == 0                                        \
 123         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 124             && !DECL_BUILT_IN (EXP)))
 125
 126 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 127    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 128    without prototypes.  */
 129 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_BINFO (NODE)
 130
 131 /* Save and restore the variables in this file and elsewhere
 132    that keep track of the progress of compilation of the current function.
 133    Used for nested functions.  */
 134
 135 struct language_function GTY(())
 136 {
 137   struct c_language_function base;
 138   int returns_value;
 139   int returns_null;
 140   int returns_abnormally;
 141   int warn_about_return_type;
 142   int extern_inline;
 143   int x_in_iteration_stmt;
 144   int x_in_case_stmt;
 145 };
 146
 147 \f
 148 /* in c-parse.in */
 149 extern void c_parse_init (void);
 150
 151 /* in c-aux-info.c */
 152 extern void gen_aux_info_record (tree, int, int, int);
 153
 154 /* in c-decl.c */
 155 extern int c_in_iteration_stmt;
 156 extern int c_in_case_stmt;
 157
 158 extern int global_bindings_p (void);
 159 extern tree getdecls (void);
 160 extern void push_scope (void);
 161 extern tree pop_scope (void);
 162 extern void insert_block (tree);
 163 extern tree pushdecl (tree);
 164 extern void c_expand_body (tree);
 165
 166 extern void c_init_decl_processing (void);
 167 extern void c_dup_lang_specific_decl (tree);
 168 extern void c_print_identifier (FILE *, tree, int);
 169 extern tree build_array_declarator (tree, tree, int, int);
 170 extern tree build_enumerator (tree, tree);
 171 extern void check_for_loop_decls (void);
 172 extern void mark_forward_parm_decls (void);
 173 extern int  complete_array_type (tree, tree, int);
 174 extern void declare_parm_level (void);
 175 extern void undeclared_variable (tree);
 176 extern tree declare_label (tree);
 177 extern tree define_label (location_t, tree);
 178 extern void finish_decl (tree, tree, tree);
 179 extern tree finish_enum (tree, tree, tree);
 180 extern void finish_function (void);
 181 extern tree finish_struct (tree, tree, tree);
 182 extern tree get_parm_info (bool);
 183 extern tree grokfield (tree, tree, tree);
 184 extern tree groktypename (tree);
 185 extern tree groktypename_in_parm_context (tree);
 186 extern tree implicitly_declare (tree);
 187 extern void keep_next_level (void);
 188 extern tree lookup_name (tree);
 189 extern void pending_xref_error (void);
 190 extern void c_push_function_context (struct function *);
 191 extern void c_pop_function_context (struct function *);
 192 extern void push_parm_decl (tree);
 193 extern tree pushdecl_top_level (tree);
 194 extern tree set_array_declarator_type (tree, tree, int);
 195 extern void shadow_tag (tree);
 196 extern void shadow_tag_warned (tree, int);
 197 extern tree start_enum (tree);
 198 extern int  start_function (tree, tree, tree);
 199 extern tree start_decl (tree, tree, int, tree);
 200 extern tree start_struct (enum tree_code, tree);
 201 extern void store_parm_decls (void);
 202 extern tree xref_tag (enum tree_code, tree);
 203 extern tree c_begin_compound_stmt (void);
 204 extern void c_expand_decl_stmt (tree);
 205 extern void c_static_assembler_name (tree);
 206 extern tree make_pointer_declarator (tree, tree);
 207
 208 /* in c-objc-common.c */
 209 extern int c_disregard_inline_limits (tree);
 210 extern int c_cannot_inline_tree_fn (tree *);
 211 extern bool c_objc_common_init (void);
 212 extern tree c_objc_common_truthvalue_conversion (tree expr);
 213 extern int c_missing_noreturn_ok_p (tree);
 214 extern void c_objc_common_finish_file (void);
 215 extern int defer_fn (tree);
 216 extern bool c_warn_unused_global_decl (tree);
 217
 218 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 219   c_build_qualified_type ((TYPE),                                 \
 220                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 221                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 222
 223 #define c_sizeof_nowarn(T)  c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 0)
 224
 225 /* in c-typeck.c */
 226
 227 /* For use with comptypes.  */
 228 enum {
 229   COMPARE_STRICT = 0
 230 };
 231
 232 extern tree require_complete_type (tree);
 233 extern int same_translation_unit_p (tree, tree);
 234 extern int comptypes (tree, tree, int);
 235 extern tree c_size_in_bytes (tree);
 236 extern bool c_mark_addressable (tree);
 237 extern void c_incomplete_type_error (tree, tree);
 238 extern tree c_type_promotes_to (tree);
 239 extern tree build_component_ref (tree, tree);
 240 extern tree build_indirect_ref (tree, const char *);
 241 extern tree build_array_ref (tree, tree);
 242 extern tree build_external_ref (tree, int);
 243 extern tree parser_build_binary_op (enum tree_code, tree, tree);
 244 extern int c_tree_expr_nonnegative_p (tree);
 245 extern void readonly_error (tree, const char *);
 246 extern tree build_conditional_expr (tree, tree, tree);
 247 extern tree build_compound_expr (tree);
 248 extern tree c_cast_expr (tree, tree);
 249 extern tree build_c_cast (tree, tree);
 250 extern tree build_modify_expr (tree, enum tree_code, tree);
 251 extern void store_init_value (tree, tree);
 252 extern void error_init (const char *);
 253 extern void pedwarn_init (const char *);
 254 extern void start_init (tree, tree, int);
 255 extern void finish_init (void);
 256 extern void really_start_incremental_init (tree);
 257 extern void push_init_level (int);
 258 extern tree pop_init_level (int);
 259 extern void set_init_index (tree, tree);
 260 extern void set_init_label (tree);
 261 extern void process_init_element (tree);
 262 extern tree build_compound_literal (tree, tree);
 263 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_PRINTF_1;
 264 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_PRINTF_1;
 265 extern tree c_start_case (tree);
 266 extern void c_finish_case (void);
 267 extern tree build_asm_expr (tree, tree, tree, tree, bool);
 268 extern tree build_asm_stmt (tree, tree);
 269 extern tree c_convert_parm_for_inlining (tree, tree, tree, int);
 270
 271 /* Set to 0 at beginning of a function definition, set to 1 if
 272    a return statement that specifies a return value is seen.  */
 273
 274 extern int current_function_returns_value;
 275
 276 /* Set to 0 at beginning of a function definition, set to 1 if
 277    a return statement with no argument is seen.  */
 278
 279 extern int current_function_returns_null;
 280
 281 /* Set to 0 at beginning of a function definition, set to 1 if
 282    a call to a noreturn function is seen.  */
 283
 284 extern int current_function_returns_abnormally;
 285
 286 /* Nonzero means we are reading code that came from a system header file.  */
 287
 288 extern int system_header_p;
 289
 290 /* True means global_bindings_p should return false even if the scope stack
 291    says we are in file scope.  */
 292
 293 extern bool c_override_global_bindings_to_false;
 294
 295 /* In c-decl.c */
 296 extern void c_finish_incomplete_decl (tree);
 297 extern void *get_current_scope (void);
 298 extern void objc_mark_locals_volatile (void *);
 299 extern void c_write_global_declarations (void);
 300
 301 extern GTY(()) tree static_ctors;
 302 extern GTY(()) tree static_dtors;
 303
 304 /* In order for the format checking to accept the C frontend
 305    diagnostic framework extensions, you must include this file before
 306    toplev.h, not after.  */
 307 #define GCC_DIAG_STYLE __gcc_cdiag__
 308
 309 #endif /* ! GCC_C_TREE_H */