symbol.h

   1 #ifndef SYMBOL_H
   2 #define SYMBOL_H
   3 /*
   4  * Basic symbol and namespace definitions.
   5  *
   6  * Copyright (C) 2003 Transmeta Corp.
   7  *               2003 Linus Torvalds
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  22  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  */
  27
  28 #include "token.h"
  29 #include "target.h"
  30
  31 /*
  32  * An identifier with semantic meaning is a "symbol".
  33  *
  34  * There's a 1:n relationship: each symbol is always
  35  * associated with one identifier, while each identifier
  36  * can have one or more semantic meanings due to C scope
  37  * rules.
  38  *
  39  * The progression is symbol -> token -> identifier. The
  40  * token contains the information on where the symbol was
  41  * declared.
  42  */
  43 enum namespace {
  44         NS_NONE = 0,
  45         NS_MACRO = 1,
  46         NS_TYPEDEF = 2,
  47         NS_STRUCT = 4,  // Also used for unions and enums.
  48         NS_LABEL = 8,
  49         NS_SYMBOL = 16,
  50         NS_ITERATOR = 32,
  51         NS_PREPROCESSOR = 64,
  52         NS_UNDEF = 128,
  53         NS_KEYWORD = 256,
  54 };
  55
  56 enum type {
  57         SYM_UNINITIALIZED,
  58         SYM_PREPROCESSOR,
  59         SYM_BASETYPE,
  60         SYM_NODE,
  61         SYM_PTR,
  62         SYM_FN,
  63         SYM_ARRAY,
  64         SYM_STRUCT,
  65         SYM_UNION,
  66         SYM_ENUM,
  67         SYM_TYPEDEF,
  68         SYM_TYPEOF,
  69         SYM_MEMBER,
  70         SYM_BITFIELD,
  71         SYM_LABEL,
  72         SYM_RESTRICT,
  73         SYM_FOULED,
  74         SYM_KEYWORD,
  75         SYM_BAD,
  76 };
  77
  78 enum keyword {
  79         KW_SPECIFIER    = 1 << 0,
  80         KW_MODIFIER     = 1 << 1,
  81         KW_QUALIFIER    = 1 << 2,
  82         KW_ATTRIBUTE    = 1 << 3,
  83         KW_STATEMENT    = 1 << 4,
  84         KW_ASM          = 1 << 5,
  85         KW_MODE         = 1 << 6,
  86         KW_SHORT        = 1 << 7,
  87         KW_LONG         = 1 << 8,
  88         KW_EXACT        = 1 << 9,
  89 };
  90
  91 struct context {
  92         struct expression *context;
  93         unsigned int in, out;
  94 };
  95
  96 extern struct context *alloc_context(void);
  97
  98 DECLARE_PTR_LIST(context_list, struct context);
  99
 100 struct ctype {
 101         unsigned long modifiers;
 102         unsigned long alignment;
 103         struct context_list *contexts;
 104         unsigned int as;
 105         struct symbol *base_type;
 106 };
 107
 108 struct decl_state {
 109         struct ctype ctype;
 110         struct ident **ident;
 111         struct symbol_op *mode;
 112         unsigned char prefer_abstract, is_inline, storage_class, is_tls;
 113 };
 114
 115 struct symbol_op {
 116         enum keyword type;
 117         int (*evaluate)(struct expression *);
 118         int (*expand)(struct expression *, int);
 119         int (*args)(struct expression *);
 120
 121         /* keywords */
 122         struct token *(*declarator)(struct token *token, struct decl_state *ctx);
 123         struct token *(*statement)(struct token *token, struct statement *stmt);
 124         struct token *(*toplevel)(struct token *token, struct symbol_list **list);
 125         struct token *(*attribute)(struct token *token, struct symbol *attr, struct decl_state *ctx);
 126         struct symbol *(*to_mode)(struct symbol *);
 127
 128         int test, set, class;
 129 };
 130
 131 extern int expand_safe_p(struct expression *expr, int cost);
 132 extern int expand_constant_p(struct expression *expr, int cost);
 133
 134 #define SYM_ATTR_WEAK           0
 135 #define SYM_ATTR_NORMAL         1
 136 #define SYM_ATTR_STRONG         2
 137
 138 struct symbol {
 139         enum type type:8;
 140         enum namespace namespace:9;
 141         unsigned char used:1, attr:2, enum_member:1, bound:1;
 142         struct position pos;            /* Where this symbol was declared */
 143         struct position endpos;         /* Where this symbol ends*/
 144         struct ident *ident;            /* What identifier this symbol is associated with */
 145         struct symbol *next_id;         /* Next semantic symbol that shares this identifier */
 146         struct symbol   *replace;       /* What is this symbol shadowed by in copy-expression */
 147         struct scope    *scope;
 148         union {
 149                 struct symbol   *same_symbol;
 150                 struct symbol   *next_subobject;
 151         };
 152
 153         struct symbol_op *op;
 154
 155         union {
 156                 struct /* NS_MACRO */ {
 157                         struct token *expansion;
 158                         struct token *arglist;
 159                         struct scope *used_in;
 160                 };
 161                 struct /* NS_PREPROCESSOR */ {
 162                         int (*handler)(struct stream *, struct token **, struct token *);
 163                         int normal;
 164                 };
 165                 struct /* NS_SYMBOL */ {
 166                         unsigned long   offset;
 167                         int             bit_size;
 168                         unsigned int    bit_offset:8,
 169                                         arg_count:10,
 170                                         variadic:1,
 171                                         initialized:1,
 172                                         examined:1,
 173                                         expanding:1,
 174                                         evaluated:1,
 175                                         string:1,
 176                                         designated_init:1,
 177                                         forced_arg:1,
 178                                         transparent_union:1;
 179                         struct expression *array_size;
 180                         struct ctype ctype;
 181                         struct symbol_list *arguments;
 182                         struct statement *stmt;
 183                         struct symbol_list *symbol_list;
 184                         struct statement *inline_stmt;
 185                         struct symbol_list *inline_symbol_list;
 186                         struct expression *initializer;
 187                         struct entrypoint *ep;
 188                         long long value;                /* Initial value */
 189                         struct symbol *definition;
 190                 };
 191         };
 192         union /* backend */ {
 193                 struct basic_block *bb_target;  /* label */
 194                 void *aux;                      /* Auxiliary info, e.g. backend information */
 195                 struct {                        /* sparse ctags */
 196                         char kind;
 197                         unsigned char visited:1;
 198                 };
 199         };
 200         pseudo_t pseudo;
 201 };
 202
 203 /* Modifiers */
 204 #define MOD_AUTO        0x0001
 205 #define MOD_REGISTER    0x0002
 206 #define MOD_STATIC      0x0004
 207 #define MOD_EXTERN      0x0008
 208
 209 #define MOD_CONST       0x0010
 210 #define MOD_VOLATILE    0x0020
 211 #define MOD_SIGNED      0x0040
 212 #define MOD_UNSIGNED    0x0080
 213
 214 #define MOD_CHAR        0x0100
 215 #define MOD_SHORT       0x0200
 216 #define MOD_LONG        0x0400
 217 #define MOD_LONGLONG    0x0800
 218 #define MOD_LONGLONGLONG        0x1000
 219 #define MOD_PURE        0x2000
 220
 221 #define MOD_TYPEDEF     0x10000
 222
 223 #define MOD_TLS         0x20000
 224 #define MOD_INLINE      0x40000
 225 #define MOD_ADDRESSABLE 0x80000
 226
 227 #define MOD_NOCAST      0x100000
 228 #define MOD_NODEREF     0x200000
 229 #define MOD_ACCESSED    0x400000
 230 #define MOD_TOPLEVEL    0x800000        // scoping..
 231
 232 #define MOD_ASSIGNED    0x2000000
 233 #define MOD_TYPE        0x4000000
 234 #define MOD_SAFE        0x8000000       // non-null/non-trapping pointer
 235
 236 #define MOD_USERTYPE    0x10000000
 237 #define MOD_NORETURN    0x20000000
 238 #define MOD_EXPLICITLY_SIGNED   0x40000000
 239 #define MOD_BITWISE     0x80000000
 240
 241
 242 #define MOD_NONLOCAL    (MOD_EXTERN | MOD_TOPLEVEL)
 243 #define MOD_STORAGE     (MOD_AUTO | MOD_REGISTER | MOD_STATIC | MOD_EXTERN | MOD_INLINE | MOD_TOPLEVEL)
 244 #define MOD_SIGNEDNESS  (MOD_SIGNED | MOD_UNSIGNED | MOD_EXPLICITLY_SIGNED)
 245 #define MOD_LONG_ALL    (MOD_LONG | MOD_LONGLONG | MOD_LONGLONGLONG)
 246 #define MOD_SPECIFIER   (MOD_CHAR | MOD_SHORT | MOD_LONG_ALL | MOD_SIGNEDNESS)
 247 #define MOD_SIZE        (MOD_CHAR | MOD_SHORT | MOD_LONG_ALL)
 248 #define MOD_IGNORE (MOD_TOPLEVEL | MOD_STORAGE | MOD_ADDRESSABLE |      \
 249         MOD_ASSIGNED | MOD_USERTYPE | MOD_ACCESSED | MOD_EXPLICITLY_SIGNED)
 250 #define MOD_PTRINHERIT (MOD_VOLATILE | MOD_CONST | MOD_NODEREF | MOD_NORETURN | MOD_NOCAST)
 251 /* modifiers preserved by typeof() operator */
 252 #define MOD_TYPEOF      (MOD_VOLATILE | MOD_CONST | MOD_NOCAST | MOD_SPECIFIER)
 253
 254
 255 /* Current parsing/evaluation function */
 256 extern struct symbol *current_fn;
 257
 258 /* Abstract types */
 259 extern struct symbol    int_type,
 260                         fp_type;
 261
 262 /* C types */
 263 extern struct symbol    bool_ctype, void_ctype, type_ctype,
 264                         char_ctype, schar_ctype, uchar_ctype,
 265                         short_ctype, sshort_ctype, ushort_ctype,
 266                         int_ctype, sint_ctype, uint_ctype,
 267                         long_ctype, slong_ctype, ulong_ctype,
 268                         llong_ctype, sllong_ctype, ullong_ctype,
 269                         lllong_ctype, slllong_ctype, ulllong_ctype,
 270                         float_ctype, double_ctype, ldouble_ctype,
 271                         string_ctype, ptr_ctype, lazy_ptr_ctype,
 272                         incomplete_ctype, label_ctype, bad_ctype,
 273                         null_ctype;
 274
 275 /* Special internal symbols */
 276 extern struct symbol    zero_int;
 277
 278 #define __IDENT(n,str,res) \
 279         extern struct ident n
 280 #include "ident-list.h"
 281
 282 #define symbol_is_typename(sym) ((sym)->type == SYM_TYPE)
 283
 284 extern struct symbol_list *translation_unit_used_list;
 285
 286 extern void access_symbol(struct symbol *);
 287
 288 extern const char * type_difference(struct ctype *c1, struct ctype *c2,
 289         unsigned long mod1, unsigned long mod2);
 290
 291 extern struct symbol *lookup_symbol(struct ident *, enum namespace);
 292 extern struct symbol *create_symbol(int stream, const char *name, int type, int namespace);
 293 extern void init_symbols(void);
 294 extern void init_ctype(void);
 295 extern struct symbol *alloc_symbol(struct position, int type);
 296 extern void show_type(struct symbol *);
 297 extern const char *modifier_string(unsigned long mod);
 298 extern void show_symbol(struct symbol *);
 299 extern int show_symbol_expr_init(struct symbol *sym);
 300 extern void show_type_list(struct symbol *);
 301 extern void show_symbol_list(struct symbol_list *, const char *);
 302 extern void add_symbol(struct symbol_list **, struct symbol *);
 303 extern void bind_symbol(struct symbol *, struct ident *, enum namespace);
 304
 305 extern struct symbol *examine_symbol_type(struct symbol *);
 306 extern struct symbol *examine_pointer_target(struct symbol *);
 307 extern void examine_simple_symbol_type(struct symbol *);
 308 extern const char *show_typename(struct symbol *sym);
 309 extern const char *builtin_typename(struct symbol *sym);
 310 extern const char *builtin_ctypename(struct ctype *ctype);
 311 extern const char* get_type_name(enum type type);
 312
 313 extern void debug_symbol(struct symbol *);
 314 extern void merge_type(struct symbol *sym, struct symbol *base_type);
 315 extern void check_declaration(struct symbol *sym);
 316
 317 static inline struct symbol *get_base_type(const struct symbol *sym)
 318 {
 319         return examine_symbol_type(sym->ctype.base_type);
 320 }
 321
 322 static inline int is_int_type(const struct symbol *type)
 323 {
 324         if (type->type == SYM_NODE)
 325                 type = type->ctype.base_type;
 326         if (type->type == SYM_ENUM)
 327                 type = type->ctype.base_type;
 328         return type->type == SYM_BITFIELD ||
 329                type->ctype.base_type == &int_type;
 330 }
 331
 332 static inline int is_enum_type(const struct symbol *type)
 333 {
 334         if (type->type == SYM_NODE)
 335                 type = type->ctype.base_type;
 336         return (type->type == SYM_ENUM);
 337 }
 338
 339 static inline int is_type_type(struct symbol *type)
 340 {
 341         return (type->ctype.modifiers & MOD_TYPE) != 0;
 342 }
 343
 344 static inline int is_ptr_type(struct symbol *type)
 345 {
 346         if (type->type == SYM_NODE)
 347                 type = type->ctype.base_type;
 348         return type->type == SYM_PTR || type->type == SYM_ARRAY || type->type == SYM_FN;
 349 }
 350
 351 static inline int is_float_type(struct symbol *type)
 352 {
 353         if (type->type == SYM_NODE)
 354                 type = type->ctype.base_type;
 355         return type->ctype.base_type == &fp_type;
 356 }
 357
 358 static inline int is_byte_type(struct symbol *type)
 359 {
 360         return type->bit_size == bits_in_char && type->type != SYM_BITFIELD;
 361 }
 362
 363 static inline int is_void_type(struct symbol *type)
 364 {
 365         if (type->type == SYM_NODE)
 366                 type = type->ctype.base_type;
 367         return type == &void_ctype;
 368 }
 369
 370 static inline int is_bool_type(struct symbol *type)
 371 {
 372         if (type->type == SYM_NODE)
 373                 type = type->ctype.base_type;
 374         return type == &bool_ctype;
 375 }
 376
 377 static inline int is_function(struct symbol *type)
 378 {
 379         return type && type->type == SYM_FN;
 380 }
 381
 382 static inline int is_extern_inline(struct symbol *sym)
 383 {
 384         return (sym->ctype.modifiers & MOD_EXTERN) &&
 385                 (sym->ctype.modifiers & MOD_INLINE) &&
 386                 is_function(sym->ctype.base_type);
 387 }
 388
 389 static inline int get_sym_type(struct symbol *type)
 390 {
 391         if (type->type == SYM_NODE)
 392                 type = type->ctype.base_type;
 393         if (type->type == SYM_ENUM)
 394                 type = type->ctype.base_type;
 395         return type->type;
 396 }
 397
 398 static inline struct symbol *lookup_keyword(struct ident *ident, enum namespace ns)
 399 {
 400         if (!ident->keyword)
 401                 return NULL;
 402         return lookup_symbol(ident, ns);
 403 }
 404
 405 #define is_restricted_type(type) (get_sym_type(type) == SYM_RESTRICT)
 406 #define is_fouled_type(type) (get_sym_type(type) == SYM_FOULED)
 407 #define is_bitfield_type(type)   (get_sym_type(type) == SYM_BITFIELD)
 408 extern int is_ptr_type(struct symbol *);
 409
 410 void create_fouled(struct symbol *type);
 411 struct symbol *befoul(struct symbol *type);
 412
 413 #endif /* SYMBOL_H */