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
  14 /*
  15  * An identifier with semantic meaning is a "symbol".
  16  *
  17  * There's a 1:n relationship: each symbol is always
  18  * associated with one identifier, while each identifier
  19  * can have one or more semantic meanings due to C scope
  20  * rules.
  21  *
  22  * The progression is symbol -> token -> identifier. The
  23  * token contains the information on where the symbol was
  24  * declared.
  25  */
  26 enum namespace {
  27         NS_NONE = 0,
  28         NS_MACRO = 1,
  29         NS_TYPEDEF = 2,
  30         NS_STRUCT = 4,  // Also used for unions and enums.
  31         NS_LABEL = 8,
  32         NS_SYMBOL = 16,
  33         NS_ITERATOR = 32,
  34         NS_PREPROCESSOR = 64,
  35         NS_UNDEF = 128,
  36         NS_KEYWORD = 256,
  37 };
  38
  39 enum type {
  40         SYM_UNINITIALIZED,
  41         SYM_PREPROCESSOR,
  42         SYM_BASETYPE,
  43         SYM_NODE,
  44         SYM_PTR,
  45         SYM_FN,
  46         SYM_ARRAY,
  47         SYM_STRUCT,
  48         SYM_UNION,
  49         SYM_ENUM,
  50         SYM_TYPEDEF,
  51         SYM_TYPEOF,
  52         SYM_MEMBER,
  53         SYM_BITFIELD,
  54         SYM_LABEL,
  55         SYM_RESTRICT,
  56         SYM_FOULED,
  57         SYM_KEYWORD,
  58         SYM_BAD,
  59 };
  60
  61 enum keyword {
  62         KW_SPECIFIER    = 1 << 0,
  63         KW_MODIFIER     = 1 << 1,
  64         KW_QUALIFIER    = 1 << 2,
  65         KW_ATTRIBUTE    = 1 << 3,
  66         KW_TYPEOF       = 1 << 4,
  67         KW_STATEMENT    = 1 << 5,
  68         KW_ASM          = 1 << 6,
  69         KW_MODE         = 1 << 7,
  70 };
  71
  72 struct context {
  73         struct expression *context;
  74         unsigned int in, out;
  75 };
  76
  77 extern struct context *alloc_context(void);
  78
  79 DECLARE_PTR_LIST(context_list, struct context);
  80
  81 struct ctype {
  82         unsigned long modifiers;
  83         unsigned long alignment;
  84         struct context_list *contexts;
  85         unsigned int as;
  86         struct symbol *base_type;
  87 };
  88
  89 struct symbol_op {
  90         enum keyword type;
  91         int (*evaluate)(struct expression *);
  92         int (*expand)(struct expression *, int);
  93         int (*args)(struct expression *);
  94
  95         /* keywords */
  96         struct token *(*declarator)(struct token *token, struct ctype *ctype);
  97         struct token *(*statement)(struct token *token, struct statement *stmt);
  98         struct token *(*toplevel)(struct token *token, struct symbol_list **list);
  99         struct token *(*attribute)(struct token *token, struct symbol *attr, struct ctype *ctype);
 100 };
 101
 102 extern int expand_safe_p(struct expression *expr, int cost);
 103 extern int expand_constant_p(struct expression *expr, int cost);
 104
 105 #define SYM_ATTR_WEAK           0
 106 #define SYM_ATTR_NORMAL         1
 107 #define SYM_ATTR_STRONG         2
 108
 109 struct symbol {
 110         enum type type:8;
 111         enum namespace namespace:9;
 112         unsigned char used:1, attr:2, enum_member:1;
 113         struct position pos;            /* Where this symbol was declared */
 114         struct ident *ident;            /* What identifier this symbol is associated with */
 115         struct symbol *next_id;         /* Next semantic symbol that shares this identifier */
 116         struct symbol **id_list;        /* Back pointer to symbol list head */
 117         struct symbol   *replace;       /* What is this symbol shadowed by in copy-expression */
 118         struct scope    *scope;
 119         union {
 120                 struct symbol   *same_symbol;
 121                 struct symbol   *next_subobject;
 122         };
 123
 124         struct symbol_op *op;
 125
 126         union {
 127                 struct /* NS_MACRO */ {
 128                         struct token *expansion;
 129                         struct token *arglist;
 130                         struct scope *used_in;
 131                 };
 132                 struct /* NS_PREPROCESSOR */ {
 133                         int (*handler)(struct stream *, struct token **, struct token *);
 134                         int normal;
 135                 };
 136                 struct /* NS_SYMBOL */ {
 137                         unsigned long   offset;
 138                         int             bit_size;
 139                         unsigned int    bit_offset:8,
 140                                         arg_count:10,
 141                                         variadic:1,
 142                                         initialized:1,
 143                                         examined:1,
 144                                         expanding:1,
 145                                         evaluated:1,
 146                                         string:1;
 147                         struct expression *array_size;
 148                         struct ctype ctype;
 149                         struct symbol_list *arguments;
 150                         struct statement *stmt;
 151                         struct symbol_list *symbol_list;
 152                         struct statement *inline_stmt;
 153                         struct symbol_list *inline_symbol_list;
 154                         struct expression *initializer;
 155                         struct entrypoint *ep;
 156                         long long value;                /* Initial value */
 157                 };
 158         };
 159         union /* backend */ {
 160                 struct basic_block *bb_target;  /* label */
 161                 void *aux;                      /* Auxiliary info, e.g. backend information */
 162                 struct {                        /* sparse ctags */
 163                         char kind;
 164                         unsigned char visited:1;
 165                 };
 166         };
 167         pseudo_t pseudo;
 168 };
 169
 170 /* Modifiers */
 171 #define MOD_AUTO        0x0001
 172 #define MOD_REGISTER    0x0002
 173 #define MOD_STATIC      0x0004
 174 #define MOD_EXTERN      0x0008
 175
 176 #define MOD_CONST       0x0010
 177 #define MOD_VOLATILE    0x0020
 178 #define MOD_SIGNED      0x0040
 179 #define MOD_UNSIGNED    0x0080
 180
 181 #define MOD_CHAR        0x0100
 182 #define MOD_SHORT       0x0200
 183 #define MOD_LONG        0x0400
 184 #define MOD_LONGLONG    0x0800
 185
 186 #define MOD_TYPEDEF     0x1000
 187
 188 #define MOD_INLINE      0x40000
 189 #define MOD_ADDRESSABLE 0x80000
 190
 191 #define MOD_NOCAST      0x100000
 192 #define MOD_NODEREF     0x200000
 193 #define MOD_ACCESSED    0x400000
 194 #define MOD_TOPLEVEL    0x800000        // scoping..
 195
 196 #define MOD_LABEL       0x1000000
 197 #define MOD_ASSIGNED    0x2000000
 198 #define MOD_TYPE        0x4000000
 199 #define MOD_SAFE        0x8000000       // non-null/non-trapping pointer
 200
 201 #define MOD_USERTYPE    0x10000000
 202 #define MOD_FORCE       0x20000000
 203 #define MOD_EXPLICITLY_SIGNED   0x40000000
 204 #define MOD_BITWISE     0x80000000
 205
 206 #define MOD_NONLOCAL    (MOD_EXTERN | MOD_TOPLEVEL)
 207 #define MOD_STORAGE     (MOD_AUTO | MOD_REGISTER | MOD_STATIC | MOD_EXTERN | MOD_INLINE | MOD_TOPLEVEL)
 208 #define MOD_SIGNEDNESS  (MOD_SIGNED | MOD_UNSIGNED | MOD_EXPLICITLY_SIGNED)
 209 #define MOD_SPECIFIER   (MOD_CHAR | MOD_SHORT | MOD_LONG | MOD_LONGLONG | MOD_SIGNEDNESS)
 210 #define MOD_SIZE        (MOD_CHAR | MOD_SHORT | MOD_LONG | MOD_LONGLONG)
 211 #define MOD_IGNORE (MOD_TOPLEVEL | MOD_STORAGE | MOD_ADDRESSABLE |      \
 212         MOD_ASSIGNED | MOD_USERTYPE | MOD_FORCE | MOD_ACCESSED | MOD_EXPLICITLY_SIGNED)
 213 #define MOD_PTRINHERIT (MOD_VOLATILE | MOD_CONST | MOD_NODEREF | MOD_STORAGE)
 214
 215
 216 /* Current parsing/evaluation function */
 217 extern struct symbol *current_fn;
 218
 219 /* Abstract types */
 220 extern struct symbol    int_type,
 221                         fp_type;
 222
 223 /* C types */
 224 extern struct symbol    bool_ctype, void_ctype, type_ctype,
 225                         char_ctype, schar_ctype, uchar_ctype,
 226                         short_ctype, sshort_ctype, ushort_ctype,
 227                         int_ctype, sint_ctype, uint_ctype,
 228                         long_ctype, slong_ctype, ulong_ctype,
 229                         llong_ctype, sllong_ctype, ullong_ctype,
 230                         float_ctype, double_ctype, ldouble_ctype,
 231                         string_ctype, ptr_ctype, lazy_ptr_ctype,
 232                         incomplete_ctype, label_ctype, bad_ctype;
 233
 234 /* Special internal symbols */
 235 extern struct symbol    zero_int;
 236
 237 #define __IDENT(n,str,res) \
 238         extern struct ident n
 239 #include "ident-list.h"
 240
 241 #define symbol_is_typename(sym) ((sym)->type == SYM_TYPE)
 242
 243 extern struct symbol_list *translation_unit_used_list;
 244
 245 extern void access_symbol(struct symbol *);
 246
 247 extern const char * type_difference(struct symbol *target, struct symbol *source,
 248         unsigned long target_mod_ignore, unsigned long source_mod_ignore);
 249
 250 extern struct symbol *lookup_symbol(struct ident *, enum namespace);
 251 extern struct symbol *create_symbol(int stream, const char *name, int type, int namespace);
 252 extern void init_symbols(void);
 253 extern void init_ctype(void);
 254 extern struct symbol *alloc_symbol(struct position, int type);
 255 extern void show_type(struct symbol *);
 256 extern const char *modifier_string(unsigned long mod);
 257 extern void show_symbol(struct symbol *);
 258 extern int show_symbol_expr_init(struct symbol *sym);
 259 extern void show_type_list(struct symbol *);
 260 extern void show_symbol_list(struct symbol_list *, const char *);
 261 extern void add_symbol(struct symbol_list **, struct symbol *);
 262 extern void bind_symbol(struct symbol *, struct ident *, enum namespace);
 263
 264 extern struct symbol *examine_symbol_type(struct symbol *);
 265 extern void examine_simple_symbol_type(struct symbol *);
 266 extern const char *show_typename(struct symbol *sym);
 267 extern const char *builtin_typename(struct symbol *sym);
 268 extern const char *builtin_ctypename(struct ctype *ctype);
 269
 270 extern void debug_symbol(struct symbol *);
 271 extern void merge_type(struct symbol *sym, struct symbol *base_type);
 272 extern void check_declaration(struct symbol *sym);
 273
 274 static inline struct symbol *get_base_type(const struct symbol *sym)
 275 {
 276         return examine_symbol_type(sym->ctype.base_type);
 277 }
 278
 279 static inline int is_int_type(const struct symbol *type)
 280 {
 281         if (type->type == SYM_NODE)
 282                 type = type->ctype.base_type;
 283         if (type->type == SYM_ENUM)
 284                 type = type->ctype.base_type;
 285         return type->type == SYM_BITFIELD ||
 286                type->ctype.base_type == &int_type;
 287 }
 288
 289 static inline int is_enum_type(const struct symbol *type)
 290 {
 291         if (type->type == SYM_NODE)
 292                 type = type->ctype.base_type;
 293         return (type->type == SYM_ENUM);
 294 }
 295
 296 static inline int get_sym_type(struct symbol *type)
 297 {
 298         if (type->type == SYM_NODE)
 299                 type = type->ctype.base_type;
 300         if (type->type == SYM_ENUM)
 301                 type = type->ctype.base_type;
 302         return type->type;
 303 }
 304
 305 static inline struct symbol *lookup_keyword(struct ident *ident, enum namespace ns)
 306 {
 307         if (!ident->keyword)
 308                 return NULL;
 309         return lookup_symbol(ident, ns);
 310 }
 311
 312 #define is_restricted_type(type) (get_sym_type(type) == SYM_RESTRICT)
 313 #define is_fouled_type(type) (get_sym_type(type) == SYM_FOULED)
 314 #define is_bitfield_type(type)   (get_sym_type(type) == SYM_BITFIELD)
 315 extern int is_ptr_type(struct symbol *);
 316
 317 void create_fouled(struct symbol *type);
 318 struct symbol *befoul(struct symbol *type);
 319
 320 #endif /* SYMBOL_H */