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 /* struct lang_identifier is private to c-decl.c, but langhooks.c needs to
  28    know how big it is.  This is sanity-checked in c-decl.c.  */
  29 #define C_SIZEOF_STRUCT_LANG_IDENTIFIER \
  30   (sizeof (struct c_common_identifier) + 3 * sizeof (void *))
  31
  32 /* For gc purposes, return the most likely link for the longest chain.  */
  33 #define C_LANG_TREE_NODE_CHAIN_NEXT(T)                          \
  34   ((union lang_tree_node *)                                     \
  35    (TREE_CODE (T) == INTEGER_TYPE ? TYPE_NEXT_VARIANT (T)       \
  36     : TREE_CODE (T) == COMPOUND_EXPR ? TREE_OPERAND (T, 1)      \
  37     : TREE_CHAIN (T)))
  38
  39 /* Language-specific declaration information.  */
  40
  41 struct lang_decl GTY(())
  42 {
  43   /* The return types and parameter types may have variable size.
  44      This is a list of any SAVE_EXPRs that need to be evaluated to
  45      compute those sizes.  */
  46   tree pending_sizes;
  47 };
  48
  49 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  50 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  51
  52 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  53 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  54
  55 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  56    nonzero if the definition of the type has already started.  */
  57 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  58
  59 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
  60    declarations whose type would be completed by completing that type.  */
  61 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
  62
  63 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
  64    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
  65    and C_RID_YYCODE is the token number wanted by Yacc.  */
  66 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
  67
  68 struct lang_type GTY(())
  69 {
  70   /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
  71   struct sorted_fields_type * GTY ((reorder ("resort_sorted_fields"))) s;
  72   /* In an ENUMERAL_TYPE, the min and max values.  */
  73   tree enum_min;
  74   tree enum_max;
  75 };
  76
  77 /* Record whether a type or decl was written with nonconstant size.
  78    Note that TYPE_SIZE may have simplified to a constant.  */
  79 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
  80 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
  81
  82 /* Store a value in that field.  */
  83 #define C_SET_EXP_ORIGINAL_CODE(EXP, CODE) \
  84   (TREE_COMPLEXITY (EXP) = (int) (CODE))
  85
  86 /* Record whether a typedef for type `int' was actually `signed int'.  */
  87 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
  88
  89 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
  90    return type.  */
  91 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
  92
  93 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
  94 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
  95
  96 /* For any decl, nonzero if it is bound in the externals scope and
  97    pop_scope mustn't chain it into any higher block.  */
  98 #define C_DECL_IN_EXTERNAL_SCOPE(EXP) DECL_LANG_FLAG_3 (EXP)
  99
 100 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
 101    been declared.  */
 102 #define C_DECL_DECLARED_BUILTIN(EXP) DECL_LANG_FLAG_4 (EXP)
 103
 104 /* Record whether a decl was declared register.  This is strictly a
 105    front-end flag, whereas DECL_REGISTER is used for code generation;
 106    they may differ for structures with volatile fields.  */
 107 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_5 (EXP)
 108
 109 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 110    N.B. Could be simplified if all built-in decls had complete prototypes
 111    (but this is presently difficult because some of them need FILE*).  */
 112 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 113        (EXP == 0                                        \
 114         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 115             && !DECL_BUILT_IN (EXP)))
 116
 117 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 118    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 119    without prototypes.  */
 120 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_BINFO (NODE)
 121
 122 /* Save and restore the variables in this file and elsewhere
 123    that keep track of the progress of compilation of the current function.
 124    Used for nested functions.  */
 125
 126 struct language_function GTY(())
 127 {
 128   struct c_language_function base;
 129   int returns_value;
 130   int returns_null;
 131   int returns_abnormally;
 132   int warn_about_return_type;
 133   int extern_inline;
 134   int x_in_iteration_stmt;
 135   int x_in_case_stmt;
 136 };
 137
 138 \f
 139 /* in c-parse.in */
 140 extern void c_parse_init (void);
 141
 142 /* in c-aux-info.c */
 143 extern void gen_aux_info_record (tree, int, int, int);
 144
 145 /* in c-decl.c */
 146 extern int c_in_iteration_stmt;
 147 extern int c_in_case_stmt;
 148
 149 extern int global_bindings_p (void);
 150 extern tree getdecls (void);
 151 extern void push_scope (void);
 152 extern tree pop_scope (void);
 153 extern void insert_block (tree);
 154 extern tree pushdecl (tree);
 155 extern void c_expand_body (tree);
 156
 157 extern void c_init_decl_processing (void);
 158 extern void c_dup_lang_specific_decl (tree);
 159 extern void c_print_identifier (FILE *, tree, int);
 160 extern tree build_array_declarator (tree, tree, int, int);
 161 extern tree build_enumerator (tree, tree);
 162 extern void check_for_loop_decls (void);
 163 extern void mark_forward_parm_decls (void);
 164 extern int  complete_array_type (tree, tree, int);
 165 extern void declare_parm_level (void);
 166 extern void undeclared_variable (tree);
 167 extern tree declare_label (tree);
 168 extern tree define_label (location_t, tree);
 169 extern void finish_decl (tree, tree, tree);
 170 extern tree finish_enum (tree, tree, tree);
 171 extern void finish_function (void);
 172 extern tree finish_struct (tree, tree, tree);
 173 extern tree get_parm_info (bool);
 174 extern tree grokfield (tree, tree, tree);
 175 extern tree groktypename (tree);
 176 extern tree groktypename_in_parm_context (tree);
 177 extern tree implicitly_declare (tree);
 178 extern void keep_next_level (void);
 179 extern tree lookup_name (tree);
 180 extern void pending_xref_error (void);
 181 extern void c_push_function_context (struct function *);
 182 extern void c_pop_function_context (struct function *);
 183 extern void push_parm_decl (tree);
 184 extern tree pushdecl_top_level (tree);
 185 extern tree set_array_declarator_type (tree, tree, int);
 186 extern void shadow_tag (tree);
 187 extern void shadow_tag_warned (tree, int);
 188 extern tree start_enum (tree);
 189 extern int  start_function (tree, tree, tree);
 190 extern tree start_decl (tree, tree, int, tree);
 191 extern tree start_struct (enum tree_code, tree);
 192 extern void store_parm_decls (void);
 193 extern tree xref_tag (enum tree_code, tree);
 194 extern tree c_begin_compound_stmt (void);
 195 extern int c_expand_decl (tree);
 196 extern void c_static_assembler_name (tree);
 197 extern tree make_pointer_declarator (tree, tree);
 198
 199 /* in c-objc-common.c */
 200 extern int c_disregard_inline_limits (tree);
 201 extern int c_cannot_inline_tree_fn (tree *);
 202 extern bool c_objc_common_init (void);
 203 extern bool c_missing_noreturn_ok_p (tree);
 204 extern tree c_objc_common_truthvalue_conversion (tree expr);
 205 extern void c_objc_common_finish_file (void);
 206 extern int defer_fn (tree);
 207 extern bool c_warn_unused_global_decl (tree);
 208
 209 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 210   c_build_qualified_type ((TYPE),                                 \
 211                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 212                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 213
 214 #define c_sizeof_nowarn(T)  c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 0)
 215
 216 /* in c-typeck.c */
 217
 218 /* For use with comptypes.  */
 219 enum {
 220   COMPARE_STRICT = 0
 221 };
 222
 223 extern tree require_complete_type (tree);
 224 extern int same_translation_unit_p (tree, tree);
 225 extern int comptypes (tree, tree, int);
 226 extern tree c_size_in_bytes (tree);
 227 extern bool c_mark_addressable (tree);
 228 extern void c_incomplete_type_error (tree, tree);
 229 extern tree c_type_promotes_to (tree);
 230 extern tree build_component_ref (tree, tree);
 231 extern tree build_indirect_ref (tree, const char *);
 232 extern tree build_array_ref (tree, tree);
 233 extern tree build_external_ref (tree, int);
 234 extern tree parser_build_binary_op (enum tree_code, tree, tree);
 235 extern int c_tree_expr_nonnegative_p (tree);
 236 extern void readonly_error (tree, const char *);
 237 extern tree build_conditional_expr (tree, tree, tree);
 238 extern tree build_compound_expr (tree);
 239 extern tree c_cast_expr (tree, tree);
 240 extern tree build_c_cast (tree, tree);
 241 extern tree build_modify_expr (tree, enum tree_code, tree);
 242 extern void store_init_value (tree, tree);
 243 extern void error_init (const char *);
 244 extern void pedwarn_init (const char *);
 245 extern void start_init (tree, tree, int);
 246 extern void finish_init (void);
 247 extern void really_start_incremental_init (tree);
 248 extern void push_init_level (int);
 249 extern tree pop_init_level (int);
 250 extern void set_init_index (tree, tree);
 251 extern void set_init_label (tree);
 252 extern void process_init_element (tree);
 253 extern tree build_compound_literal (tree, tree);
 254 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_PRINTF_1;
 255 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_PRINTF_1;
 256 extern tree c_start_case (tree);
 257 extern void c_finish_case (void);
 258 extern tree build_asm_expr (tree, tree, tree, tree, bool);
 259 extern tree build_asm_stmt (tree, tree);
 260 extern tree c_convert_parm_for_inlining (tree, tree, tree, int);
 261 extern int c_types_compatible_p (tree, tree);
 262
 263 /* Set to 0 at beginning of a function definition, set to 1 if
 264    a return statement that specifies a return value is seen.  */
 265
 266 extern int current_function_returns_value;
 267
 268 /* Set to 0 at beginning of a function definition, set to 1 if
 269    a return statement with no argument is seen.  */
 270
 271 extern int current_function_returns_null;
 272
 273 /* Set to 0 at beginning of a function definition, set to 1 if
 274    a call to a noreturn function is seen.  */
 275
 276 extern int current_function_returns_abnormally;
 277
 278 /* Nonzero means we are reading code that came from a system header file.  */
 279
 280 extern int system_header_p;
 281
 282 /* True means global_bindings_p should return false even if the scope stack
 283    says we are in file scope.  */
 284
 285 extern bool c_override_global_bindings_to_false;
 286
 287 /* In c-decl.c */
 288 extern void c_finish_incomplete_decl (tree);
 289 extern void *get_current_scope (void);
 290 extern void objc_mark_locals_volatile (void *);
 291 extern void c_write_global_declarations (void);
 292
 293 extern GTY(()) tree static_ctors;
 294 extern GTY(()) tree static_dtors;
 295
 296 /* In order for the format checking to accept the C frontend
 297    diagnostic framework extensions, you must include this file before
 298    toplev.h, not after.  */
 299 #define GCC_DIAG_STYLE __gcc_cdiag__
 300
 301 #endif /* ! GCC_C_TREE_H */