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  *  Licensed under the Open Software License version 1.1
  10  */
  11
  12 #include "token.h"
  13 #include "target.h"
  14
  15 /*
  16  * An identifier with semantic meaning is a "symbol".
  17  *
  18  * There's a 1:n relationship: each symbol is always
  19  * associated with one identifier, while each identifier
  20  * can have one or more semantic meanings due to C scope
  21  * rules.
  22  *
  23  * The progression is symbol -> token -> identifier. The
  24  * token contains the information on where the symbol was
  25  * declared.
  26  */
  27 enum namespace {
  28         NS_NONE = 0,
  29         NS_MACRO = 1,
  30         NS_TYPEDEF = 2,
  31         NS_STRUCT = 4,  // Also used for unions and enums.
  32         NS_LABEL = 8,
  33         NS_SYMBOL = 16,
  34         NS_ITERATOR = 32,
  35         NS_PREPROCESSOR = 64,
  36         NS_UNDEF = 128,
  37         NS_KEYWORD = 256,
  38 };
  39
  40 enum type {
  41         SYM_UNINITIALIZED,
  42         SYM_PREPROCESSOR,
  43         SYM_BASETYPE,
  44         SYM_NODE,
  45         SYM_PTR,
  46         SYM_FN,
  47         SYM_ARRAY,
  48         SYM_STRUCT,
  49         SYM_UNION,
  50         SYM_ENUM,
  51         SYM_TYPEDEF,
  52         SYM_TYPEOF,
  53         SYM_MEMBER,
  54         SYM_BITFIELD,
  55         SYM_LABEL,
  56         SYM_RESTRICT,
  57         SYM_FOULED,
  58         SYM_KEYWORD,
  59         SYM_BAD,
  60 };
  61
  62 enum keyword {
  63         KW_SPECIFIER    = 1 << 0,
  64         KW_MODIFIER     = 1 << 1,
  65         KW_QUALIFIER    = 1 << 2,
  66         KW_ATTRIBUTE    = 1 << 3,
  67         KW_STATEMENT    = 1 << 4,
  68         KW_ASM          = 1 << 5,
  69         KW_MODE         = 1 << 6,
  70         KW_SHORT        = 1 << 7,
  71         KW_LONG         = 1 << 8,
  72         KW_EXACT        = 1 << 9,
  73 };
  74
  75 struct context {
  76         struct expression *context;
  77         unsigned int in, out;
  78 };
  79
  80 extern struct context *alloc_context(void);
  81
  82 DECLARE_PTR_LIST(context_list, struct context);
  83
  84 struct ctype {
  85         unsigned long modifiers;
  86         unsigned long alignment;
  87         struct context_list *contexts;
  88         unsigned int as;
  89         struct symbol *base_type;
  90 };
  91
  92 struct decl_state {
  93         struct ctype ctype;
  94         struct ident **ident;
  95         struct symbol_op *mode;
  96         unsigned char prefer_abstract, is_inline, storage_class, is_tls;
  97 };
  98
  99 struct symbol_op {
 100         enum keyword type;
 101         int (*evaluate)(struct expression *);
 102         int (*expand)(struct expression *, int);
 103         int (*args)(struct expression *);
 104
 105         /* keywords */
 106         struct token *(*declarator)(struct token *token, struct decl_state *ctx);
 107         struct token *(*statement)(struct token *token, struct statement *stmt);
 108         struct token *(*toplevel)(struct token *token, struct symbol_list **list);
 109         struct token *(*attribute)(struct token *token, struct symbol *attr, struct decl_state *ctx);
 110         struct symbol *(*to_mode)(struct symbol *);
 111
 112         int test, set, class;
 113 };
 114
 115 extern int expand_safe_p(struct expression *expr, int cost);
 116 extern int expand_constant_p(struct expression *expr, int cost);
 117
 118 #define SYM_ATTR_WEAK           0
 119 #define SYM_ATTR_NORMAL         1
 120 #define SYM_ATTR_STRONG         2
 121
 122 struct symbol {
 123         enum type type:8;
 124         enum namespace namespace:9;
 125         unsigned char used:1, attr:2, enum_member:1, bound:1;
 126         struct position pos;            /* Where this symbol was declared */
 127         struct position endpos;         /* Where this symbol ends*/
 128         struct ident *ident;            /* What identifier this symbol is associated with */
 129         struct symbol *next_id;         /* Next semantic symbol that shares this identifier */
 130         struct symbol   *replace;       /* What is this symbol shadowed by in copy-expression */
 131         struct scope    *scope;
 132         union {
 133                 struct symbol   *same_symbol;
 134                 struct symbol   *next_subobject;
 135         };
 136
 137         struct symbol_op *op;
 138
 139         union {
 140                 struct /* NS_MACRO */ {
 141                         struct token *expansion;
 142                         struct token *arglist;
 143                         struct scope *used_in;
 144                 };
 145                 struct /* NS_PREPROCESSOR */ {
 146                         int (*handler)(struct stream *, struct token **, struct token *);
 147                         int normal;
 148                 };
 149                 struct /* NS_SYMBOL */ {
 150                         unsigned long   offset;
 151                         int             bit_size;
 152                         unsigned int    bit_offset:8,
 153                                         arg_count:10,
 154                                         variadic:1,
 155                                         initialized:1,
 156                                         examined:1,
 157                                         expanding:1,
 158                                         evaluated:1,
 159                                         string:1,
 160                                         designated_init:1,
 161                                         forced_arg:1;
 162                         struct expression *array_size;
 163                         struct ctype ctype;
 164                         struct symbol_list *arguments;
 165                         struct statement *stmt;
 166                         struct symbol_list *symbol_list;
 167                         struct statement *inline_stmt;
 168                         struct symbol_list *inline_symbol_list;
 169                         struct expression *initializer;
 170                         struct entrypoint *ep;
 171                         long long value;                /* Initial value */
 172                         struct symbol *definition;
 173                 };
 174         };
 175         union /* backend */ {
 176                 struct basic_block *bb_target;  /* label */
 177                 void *aux;                      /* Auxiliary info, e.g. backend information */
 178                 struct {                        /* sparse ctags */
 179                         char kind;
 180                         unsigned char visited:1;
 181                 };
 182         };
 183         pseudo_t pseudo;
 184 };
 185
 186 /* Modifiers */
 187 #define MOD_AUTO        0x0001
 188 #define MOD_REGISTER    0x0002
 189 #define MOD_STATIC      0x0004
 190 #define MOD_EXTERN      0x0008
 191
 192 #define MOD_CONST       0x0010
 193 #define MOD_VOLATILE    0x0020
 194 #define MOD_SIGNED      0x0040
 195 #define MOD_UNSIGNED    0x0080
 196
 197 #define MOD_CHAR        0x0100
 198 #define MOD_SHORT       0x0200
 199 #define MOD_LONG        0x0400
 200 #define MOD_LONGLONG    0x0800
 201 #define MOD_LONGLONGLONG        0x1000
 202 #define MOD_PURE        0x2000
 203
 204 #define MOD_TYPEDEF     0x10000
 205
 206 #define MOD_TLS         0x20000
 207 #define MOD_INLINE      0x40000
 208 #define MOD_ADDRESSABLE 0x80000
 209
 210 #define MOD_NOCAST      0x100000
 211 #define MOD_NODEREF     0x200000
 212 #define MOD_ACCESSED    0x400000
 213 #define MOD_TOPLEVEL    0x800000        // scoping..
 214
 215 #define MOD_ASSIGNED    0x2000000
 216 #define MOD_TYPE        0x4000000
 217 #define MOD_SAFE        0x8000000       // non-null/non-trapping pointer
 218
 219 #define MOD_USERTYPE    0x10000000
 220 #define MOD_NORETURN    0x20000000
 221 #define MOD_EXPLICITLY_SIGNED   0x40000000
 222 #define MOD_BITWISE     0x80000000
 223
 224
 225 #define MOD_NONLOCAL    (MOD_EXTERN | MOD_TOPLEVEL)
 226 #define MOD_STORAGE     (MOD_AUTO | MOD_REGISTER | MOD_STATIC | MOD_EXTERN | MOD_INLINE | MOD_TOPLEVEL)
 227 #define MOD_SIGNEDNESS  (MOD_SIGNED | MOD_UNSIGNED | MOD_EXPLICITLY_SIGNED)
 228 #define MOD_LONG_ALL    (MOD_LONG | MOD_LONGLONG | MOD_LONGLONGLONG)
 229 #define MOD_SPECIFIER   (MOD_CHAR | MOD_SHORT | MOD_LONG_ALL | MOD_SIGNEDNESS)
 230 #define MOD_SIZE        (MOD_CHAR | MOD_SHORT | MOD_LONG_ALL)
 231 #define MOD_IGNORE (MOD_TOPLEVEL | MOD_STORAGE | MOD_ADDRESSABLE |      \
 232         MOD_ASSIGNED | MOD_USERTYPE | MOD_ACCESSED | MOD_EXPLICITLY_SIGNED)
 233 #define MOD_PTRINHERIT (MOD_VOLATILE | MOD_CONST | MOD_NODEREF | MOD_STORAGE | MOD_NORETURN)
 234
 235
 236 /* Current parsing/evaluation function */
 237 extern struct symbol *current_fn;
 238
 239 /* Abstract types */
 240 extern struct symbol    int_type,
 241                         fp_type;
 242
 243 /* C types */
 244 extern struct symbol    bool_ctype, void_ctype, type_ctype,
 245                         char_ctype, schar_ctype, uchar_ctype,
 246                         short_ctype, sshort_ctype, ushort_ctype,
 247                         int_ctype, sint_ctype, uint_ctype,
 248                         long_ctype, slong_ctype, ulong_ctype,
 249                         llong_ctype, sllong_ctype, ullong_ctype,
 250                         lllong_ctype, slllong_ctype, ulllong_ctype,
 251                         float_ctype, double_ctype, ldouble_ctype,
 252                         string_ctype, ptr_ctype, lazy_ptr_ctype,
 253                         incomplete_ctype, label_ctype, bad_ctype,
 254                         null_ctype;
 255
 256 /* Special internal symbols */
 257 extern struct symbol    zero_int;
 258
 259 #define __IDENT(n,str,res) \
 260         extern struct ident n
 261 #include "ident-list.h"
 262
 263 #define symbol_is_typename(sym) ((sym)->type == SYM_TYPE)
 264
 265 extern struct symbol_list *translation_unit_used_list;
 266
 267 extern void access_symbol(struct symbol *);
 268
 269 extern const char * type_difference(struct ctype *c1, struct ctype *c2,
 270         unsigned long mod1, unsigned long mod2);
 271
 272 extern struct symbol *lookup_symbol(struct ident *, enum namespace);
 273 extern struct symbol *create_symbol(int stream, const char *name, int type, int namespace);
 274 extern void init_symbols(void);
 275 extern void init_ctype(void);
 276 extern struct symbol *alloc_symbol(struct position, int type);
 277 extern void show_type(struct symbol *);
 278 extern const char *modifier_string(unsigned long mod);
 279 extern void show_symbol(struct symbol *);
 280 extern int show_symbol_expr_init(struct symbol *sym);
 281 extern void show_type_list(struct symbol *);
 282 extern void show_symbol_list(struct symbol_list *, const char *);
 283 extern void add_symbol(struct symbol_list **, struct symbol *);
 284 extern void bind_symbol(struct symbol *, struct ident *, enum namespace);
 285
 286 extern struct symbol *examine_symbol_type(struct symbol *);
 287 extern struct symbol *examine_pointer_target(struct symbol *);
 288 extern void examine_simple_symbol_type(struct symbol *);
 289 extern const char *show_typename(struct symbol *sym);
 290 extern const char *builtin_typename(struct symbol *sym);
 291 extern const char *builtin_ctypename(struct ctype *ctype);
 292 extern const char* get_type_name(enum type type);
 293
 294 extern void debug_symbol(struct symbol *);
 295 extern void merge_type(struct symbol *sym, struct symbol *base_type);
 296 extern void check_declaration(struct symbol *sym);
 297
 298 static inline struct symbol *get_base_type(const struct symbol *sym)
 299 {
 300         return examine_symbol_type(sym->ctype.base_type);
 301 }
 302
 303 static inline int is_int_type(const struct symbol *type)
 304 {
 305         if (type->type == SYM_NODE)
 306                 type = type->ctype.base_type;
 307         if (type->type == SYM_ENUM)
 308                 type = type->ctype.base_type;
 309         return type->type == SYM_BITFIELD ||
 310                type->ctype.base_type == &int_type;
 311 }
 312
 313 static inline int is_enum_type(const struct symbol *type)
 314 {
 315         if (type->type == SYM_NODE)
 316                 type = type->ctype.base_type;
 317         return (type->type == SYM_ENUM);
 318 }
 319
 320 static inline int is_type_type(struct symbol *type)
 321 {
 322         return (type->ctype.modifiers & MOD_TYPE) != 0;
 323 }
 324
 325 static inline int is_ptr_type(struct symbol *type)
 326 {
 327         if (type->type == SYM_NODE)
 328                 type = type->ctype.base_type;
 329         return type->type == SYM_PTR || type->type == SYM_ARRAY || type->type == SYM_FN;
 330 }
 331
 332 static inline int is_float_type(struct symbol *type)
 333 {
 334         if (type->type == SYM_NODE)
 335                 type = type->ctype.base_type;
 336         return type->ctype.base_type == &fp_type;
 337 }
 338
 339 static inline int is_byte_type(struct symbol *type)
 340 {
 341         return type->bit_size == bits_in_char && type->type != SYM_BITFIELD;
 342 }
 343
 344 static inline int is_void_type(struct symbol *type)
 345 {
 346         if (type->type == SYM_NODE)
 347                 type = type->ctype.base_type;
 348         return type == &void_ctype;
 349 }
 350
 351 static inline int is_bool_type(struct symbol *type)
 352 {
 353         if (type->type == SYM_NODE)
 354                 type = type->ctype.base_type;
 355         return type == &bool_ctype;
 356 }
 357
 358 static inline int is_function(struct symbol *type)
 359 {
 360         return type && type->type == SYM_FN;
 361 }
 362
 363 static inline int is_extern_inline(struct symbol *sym)
 364 {
 365         return (sym->ctype.modifiers & MOD_EXTERN) &&
 366                 (sym->ctype.modifiers & MOD_INLINE) &&
 367                 is_function(sym->ctype.base_type);
 368 }
 369
 370 static inline int get_sym_type(struct symbol *type)
 371 {
 372         if (type->type == SYM_NODE)
 373                 type = type->ctype.base_type;
 374         if (type->type == SYM_ENUM)
 375                 type = type->ctype.base_type;
 376         return type->type;
 377 }
 378
 379 static inline struct symbol *lookup_keyword(struct ident *ident, enum namespace ns)
 380 {
 381         if (!ident->keyword)
 382                 return NULL;
 383         return lookup_symbol(ident, ns);
 384 }
 385
 386 #define is_restricted_type(type) (get_sym_type(type) == SYM_RESTRICT)
 387 #define is_fouled_type(type) (get_sym_type(type) == SYM_FOULED)
 388 #define is_bitfield_type(type)   (get_sym_type(type) == SYM_BITFIELD)
 389 extern int is_ptr_type(struct symbol *);
 390
 391 void create_fouled(struct symbol *type);
 392 struct symbol *befoul(struct symbol *type);
 393
 394 #endif /* SYMBOL_H */