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 #include "allocate.h"
  31
  32 /*
  33  * An identifier with semantic meaning is a "symbol".
  34  *
  35  * There's a 1:n relationship: each symbol is always
  36  * associated with one identifier, while each identifier
  37  * can have one or more semantic meanings due to C scope
  38  * rules.
  39  *
  40  * The progression is symbol -> token -> identifier. The
  41  * token contains the information on where the symbol was
  42  * declared.
  43  */
  44 enum namespace {
  45         NS_NONE = 0,
  46         NS_MACRO = 1,
  47         NS_TYPEDEF = 2,
  48         NS_STRUCT = 4,  // Also used for unions and enums.
  49         NS_LABEL = 8,
  50         NS_SYMBOL = 16,
  51         NS_ITERATOR = 32,
  52         NS_PREPROCESSOR = 64,
  53         NS_UNDEF = 128,
  54         NS_KEYWORD = 256,
  55 };
  56
  57 enum type {
  58         SYM_UNINITIALIZED,
  59         SYM_PREPROCESSOR,
  60         SYM_BASETYPE,
  61         SYM_NODE,
  62         SYM_PTR,
  63         SYM_FN,
  64         SYM_ARRAY,
  65         SYM_STRUCT,
  66         SYM_UNION,
  67         SYM_ENUM,
  68         SYM_TYPEDEF,
  69         SYM_TYPEOF,
  70         SYM_MEMBER,
  71         SYM_BITFIELD,
  72         SYM_LABEL,
  73         SYM_RESTRICT,
  74         SYM_FOULED,
  75         SYM_KEYWORD,
  76         SYM_BAD,
  77 };
  78
  79 enum keyword {
  80         KW_SPECIFIER    = 1 << 0,
  81         KW_MODIFIER     = 1 << 1,
  82         KW_QUALIFIER    = 1 << 2,
  83         KW_ATTRIBUTE    = 1 << 3,
  84         KW_STATEMENT    = 1 << 4,
  85         KW_ASM          = 1 << 5,
  86         KW_MODE         = 1 << 6,
  87         KW_SHORT        = 1 << 7,
  88         KW_LONG         = 1 << 8,
  89         KW_EXACT        = 1 << 9,
  90 };
  91
  92 struct context {
  93         struct expression *context;
  94         unsigned int in, out;
  95 };
  96
  97 extern struct context *alloc_context(void);
  98
  99 struct attribute {
 100         struct context_list *contexts;
 101         unsigned int as;
 102         unsigned int is_packed:1;
 103 };
 104
 105
 106 struct ctype {
 107         unsigned long modifiers;
 108         unsigned long alignment;
 109         struct attribute *attribute;
 110         struct symbol *base_type;
 111 };
 112
 113 struct decl_state {
 114         struct ctype ctype;
 115         struct ident **ident;
 116         struct symbol_op *mode;
 117         unsigned char prefer_abstract, is_inline, storage_class, is_tls;
 118 };
 119
 120 struct symbol_op {
 121         enum keyword type;
 122         int (*evaluate)(struct expression *);
 123         int (*expand)(struct expression *, int);
 124         int (*args)(struct expression *);
 125
 126         /* keywords */
 127         struct token *(*declarator)(struct token *token, struct decl_state *ctx);
 128         struct token *(*statement)(struct token *token, struct statement *stmt);
 129         struct token *(*toplevel)(struct token *token, struct symbol_list **list);
 130         struct token *(*attribute)(struct token *token, struct symbol *attr, struct decl_state *ctx);
 131         struct symbol *(*to_mode)(struct symbol *);
 132
 133         int test, set, class;
 134 };
 135
 136 extern int expand_safe_p(struct expression *expr, int cost);
 137 extern int expand_constant_p(struct expression *expr, int cost);
 138
 139 #define SYM_ATTR_WEAK           0
 140 #define SYM_ATTR_NORMAL         1
 141 #define SYM_ATTR_STRONG         2
 142
 143 struct symbol {
 144         enum type type:8;
 145         enum namespace namespace:9;
 146         unsigned char used:1, attr:2, enum_member:1, bound:1;
 147         struct position pos;            /* Where this symbol was declared */
 148         struct position endpos;         /* Where this symbol ends*/
 149         struct ident *ident;            /* What identifier this symbol is associated with */
 150         struct symbol *next_id;         /* Next semantic symbol that shares this identifier */
 151         struct symbol   *replace;       /* What is this symbol shadowed by in copy-expression */
 152         struct scope    *scope;
 153         union {
 154                 struct symbol   *same_symbol;
 155                 struct symbol   *next_subobject;
 156         };
 157
 158         struct symbol_op *op;
 159
 160         union {
 161                 struct /* NS_MACRO */ {
 162                         struct token *expansion;
 163                         struct token *arglist;
 164                         struct scope *used_in;
 165                 };
 166                 struct /* NS_PREPROCESSOR */ {
 167                         int (*handler)(struct stream *, struct token **, struct token *);
 168                         int normal;
 169                 };
 170                 struct /* NS_SYMBOL */ {
 171                         unsigned long   offset;
 172                         int             bit_size;
 173                         unsigned int    bit_offset:8,
 174                                         arg_count:10,
 175                                         variadic:1,
 176                                         initialized:1,
 177                                         examined:1,
 178                                         expanding:1,
 179                                         evaluated:1,
 180                                         string:1,
 181                                         designated_init:1,
 182                                         forced_arg:1,
 183                                         transparent_union:1;
 184                         struct expression *array_size;
 185                         struct ctype ctype;
 186                         struct symbol_list *arguments;
 187                         struct statement *stmt;
 188                         struct symbol_list *symbol_list;
 189                         struct statement *inline_stmt;
 190                         struct symbol_list *inline_symbol_list;
 191                         struct expression *initializer;
 192                         struct entrypoint *ep;
 193                         long long value;                /* Initial value */
 194                         struct symbol *definition;
 195                 };
 196         };
 197         union /* backend */ {
 198                 struct basic_block *bb_target;  /* label */
 199                 void *aux;                      /* Auxiliary info, e.g. backend information */
 200                 struct {                        /* sparse ctags */
 201                         char kind;
 202                         unsigned char visited:1;
 203                 };
 204         };
 205         pseudo_t pseudo;
 206 };
 207
 208 /* Modifiers */
 209 #define MOD_AUTO        0x0001
 210 #define MOD_REGISTER    0x0002
 211 #define MOD_STATIC      0x0004
 212 #define MOD_EXTERN      0x0008
 213
 214 #define MOD_CONST       0x0010
 215 #define MOD_VOLATILE    0x0020
 216 #define MOD_SIGNED      0x0040
 217 #define MOD_UNSIGNED    0x0080
 218
 219 #define MOD_CHAR        0x0100
 220 #define MOD_SHORT       0x0200
 221 #define MOD_LONG        0x0400
 222 #define MOD_LONGLONG    0x0800
 223 #define MOD_LONGLONGLONG        0x1000
 224 #define MOD_PURE        0x2000
 225
 226 #define MOD_TYPEDEF     0x10000
 227
 228 #define MOD_TLS         0x20000
 229 #define MOD_INLINE      0x40000
 230 #define MOD_ADDRESSABLE 0x80000
 231
 232 #define MOD_NOCAST      0x100000
 233 #define MOD_NODEREF     0x200000
 234 #define MOD_ACCESSED    0x400000
 235 #define MOD_TOPLEVEL    0x800000        // scoping..
 236
 237 #define MOD_ASSIGNED    0x2000000
 238 #define MOD_TYPE        0x4000000
 239 #define MOD_SAFE        0x8000000       // non-null/non-trapping pointer
 240
 241 #define MOD_USERTYPE    0x10000000
 242 #define MOD_NORETURN    0x20000000
 243 #define MOD_EXPLICITLY_SIGNED   0x40000000
 244 #define MOD_BITWISE     0x80000000
 245
 246
 247 #define MOD_NONLOCAL    (MOD_EXTERN | MOD_TOPLEVEL)
 248 #define MOD_STORAGE     (MOD_AUTO | MOD_REGISTER | MOD_STATIC | MOD_EXTERN | MOD_INLINE | MOD_TOPLEVEL)
 249 #define MOD_SIGNEDNESS  (MOD_SIGNED | MOD_UNSIGNED | MOD_EXPLICITLY_SIGNED)
 250 #define MOD_LONG_ALL    (MOD_LONG | MOD_LONGLONG | MOD_LONGLONGLONG)
 251 #define MOD_SPECIFIER   (MOD_CHAR | MOD_SHORT | MOD_LONG_ALL | MOD_SIGNEDNESS)
 252 #define MOD_SIZE        (MOD_CHAR | MOD_SHORT | MOD_LONG_ALL)
 253 #define MOD_IGNORE (MOD_TOPLEVEL | MOD_STORAGE | MOD_ADDRESSABLE |      \
 254         MOD_ASSIGNED | MOD_USERTYPE | MOD_ACCESSED | MOD_EXPLICITLY_SIGNED)
 255 #define MOD_PTRINHERIT (MOD_VOLATILE | MOD_CONST | MOD_NODEREF | MOD_STORAGE | MOD_NORETURN)
 256
 257 /* default empty attribute */
 258 extern struct attribute null_attr;
 259
 260 /* Current parsing/evaluation function */
 261 extern struct symbol *current_fn;
 262
 263 /* Abstract types */
 264 extern struct symbol    int_type,
 265                         fp_type;
 266
 267 /* C types */
 268 extern struct symbol    bool_ctype, void_ctype, type_ctype,
 269                         char_ctype, schar_ctype, uchar_ctype,
 270                         short_ctype, sshort_ctype, ushort_ctype,
 271                         int_ctype, sint_ctype, uint_ctype,
 272                         long_ctype, slong_ctype, ulong_ctype,
 273                         llong_ctype, sllong_ctype, ullong_ctype,
 274                         lllong_ctype, slllong_ctype, ulllong_ctype,
 275                         float_ctype, double_ctype, ldouble_ctype,
 276                         string_ctype, ptr_ctype, lazy_ptr_ctype,
 277                         incomplete_ctype, label_ctype, bad_ctype,
 278                         null_ctype;
 279
 280 /* Special internal symbols */
 281 extern struct symbol    zero_int;
 282
 283 #define __IDENT(n,str,res) \
 284         extern struct ident n
 285 #include "ident-list.h"
 286
 287 #define symbol_is_typename(sym) ((sym)->type == SYM_TYPE)
 288
 289 extern struct symbol_list *translation_unit_used_list;
 290
 291 extern void access_symbol(struct symbol *);
 292
 293 extern const char * type_difference(struct ctype *c1, struct ctype *c2,
 294         unsigned long mod1, unsigned long mod2);
 295
 296 extern struct symbol *lookup_symbol(struct ident *, enum namespace);
 297 extern struct symbol *create_symbol(int stream, const char *name, int type, int namespace);
 298 extern void init_symbols(void);
 299 extern void init_ctype(void);
 300 extern struct symbol *alloc_symbol(struct position, int type);
 301 extern void show_type(struct symbol *);
 302 extern const char *modifier_string(unsigned long mod);
 303 extern void show_symbol(struct symbol *);
 304 extern int show_symbol_expr_init(struct symbol *sym);
 305 extern void show_type_list(struct symbol *);
 306 extern void show_symbol_list(struct symbol_list *, const char *);
 307 extern void add_symbol(struct symbol_list **, struct symbol *);
 308 extern void bind_symbol(struct symbol *, struct ident *, enum namespace);
 309
 310 extern struct symbol *examine_symbol_type(struct symbol *);
 311 extern struct symbol *examine_pointer_target(struct symbol *);
 312 extern void examine_simple_symbol_type(struct symbol *);
 313 extern const char *show_typename(struct symbol *sym);
 314 extern const char *builtin_typename(struct symbol *sym);
 315 extern const char *builtin_ctypename(struct ctype *ctype);
 316 extern const char* get_type_name(enum type type);
 317
 318 extern void debug_symbol(struct symbol *);
 319 extern void merge_type(struct symbol *sym, struct symbol *base_type);
 320 extern void check_declaration(struct symbol *sym);
 321
 322 static inline struct symbol *get_base_type(const struct symbol *sym)
 323 {
 324         return examine_symbol_type(sym->ctype.base_type);
 325 }
 326
 327 static inline int is_int_type(const struct symbol *type)
 328 {
 329         if (type->type == SYM_NODE)
 330                 type = type->ctype.base_type;
 331         if (type->type == SYM_ENUM)
 332                 type = type->ctype.base_type;
 333         return type->type == SYM_BITFIELD ||
 334                type->ctype.base_type == &int_type;
 335 }
 336
 337 static inline int is_enum_type(const struct symbol *type)
 338 {
 339         if (type->type == SYM_NODE)
 340                 type = type->ctype.base_type;
 341         return (type->type == SYM_ENUM);
 342 }
 343
 344 static inline int is_type_type(struct symbol *type)
 345 {
 346         return (type->ctype.modifiers & MOD_TYPE) != 0;
 347 }
 348
 349 static inline int is_ptr_type(struct symbol *type)
 350 {
 351         if (type->type == SYM_NODE)
 352                 type = type->ctype.base_type;
 353         return type->type == SYM_PTR || type->type == SYM_ARRAY || type->type == SYM_FN;
 354 }
 355
 356 static inline int is_float_type(struct symbol *type)
 357 {
 358         if (type->type == SYM_NODE)
 359                 type = type->ctype.base_type;
 360         return type->ctype.base_type == &fp_type;
 361 }
 362
 363 static inline int is_byte_type(struct symbol *type)
 364 {
 365         return type->bit_size == bits_in_char && type->type != SYM_BITFIELD;
 366 }
 367
 368 static inline int is_void_type(struct symbol *type)
 369 {
 370         if (type->type == SYM_NODE)
 371                 type = type->ctype.base_type;
 372         return type == &void_ctype;
 373 }
 374
 375 static inline int is_bool_type(struct symbol *type)
 376 {
 377         if (type->type == SYM_NODE)
 378                 type = type->ctype.base_type;
 379         return type == &bool_ctype;
 380 }
 381
 382 static inline int is_function(struct symbol *type)
 383 {
 384         return type && type->type == SYM_FN;
 385 }
 386
 387 static inline int is_extern_inline(struct symbol *sym)
 388 {
 389         return (sym->ctype.modifiers & MOD_EXTERN) &&
 390                 (sym->ctype.modifiers & MOD_INLINE) &&
 391                 is_function(sym->ctype.base_type);
 392 }
 393
 394 static inline int get_sym_type(struct symbol *type)
 395 {
 396         if (type->type == SYM_NODE)
 397                 type = type->ctype.base_type;
 398         if (type->type == SYM_ENUM)
 399                 type = type->ctype.base_type;
 400         return type->type;
 401 }
 402
 403 static inline struct symbol *lookup_keyword(struct ident *ident, enum namespace ns)
 404 {
 405         if (!ident->keyword)
 406                 return NULL;
 407         return lookup_symbol(ident, ns);
 408 }
 409
 410 static inline struct attribute *duplicate_attribute(struct attribute *attr)
 411 {
 412                 struct attribute *newattr = __alloc_attribute(0);
 413                 *newattr = *attr;
 414                 return newattr;
 415 }
 416
 417 static inline void attr_set_as(struct ctype *ctype, unsigned int as)
 418 {
 419         if (ctype->attribute->as != as) {
 420                 ctype->attribute = duplicate_attribute(ctype->attribute);
 421                 ctype->attribute->as = as;
 422         }
 423 }
 424
 425 static inline void attr_add_context(struct ctype *ctype, struct context *context)
 426 {
 427         ctype->attribute = duplicate_attribute(ctype->attribute);
 428         add_ptr_list(&ctype->attribute->contexts, context);
 429 }
 430
 431 static inline void merge_attr(struct ctype *dst, struct ctype *src)
 432 {
 433         struct attribute *attr;
 434
 435         if (src->attribute == &null_attr)
 436                 return;
 437         if (dst->attribute == &null_attr) {
 438                 dst->attribute  = src->attribute;
 439                 return;
 440         }
 441
 442         dst->attribute = attr = duplicate_attribute(dst->attribute);
 443         attr->as |= src->attribute->as;
 444         concat_ptr_list((struct ptr_list *)src->attribute->contexts,
 445                         (struct ptr_list **)&attr->contexts);
 446 }
 447
 448 static inline void set_attr_is_packed(struct ctype *ctype)
 449 {
 450         if (ctype->attribute == &null_attr)
 451                 ctype->attribute = __alloc_attribute(0);
 452         ctype->attribute->is_packed = 1;
 453 }
 454
 455 #define is_restricted_type(type) (get_sym_type(type) == SYM_RESTRICT)
 456 #define is_fouled_type(type) (get_sym_type(type) == SYM_FOULED)
 457 #define is_bitfield_type(type)   (get_sym_type(type) == SYM_BITFIELD)
 458 extern int is_ptr_type(struct symbol *);
 459
 460 void create_fouled(struct symbol *type);
 461 struct symbol *befoul(struct symbol *type);
 462
 463 #endif /* SYMBOL_H */