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_PREPROCESSOR = 1,
  29         NS_TYPEDEF = 2,
  30         NS_STRUCT = 4,
  31         NS_ENUM = 8,
  32         NS_LABEL = 16,
  33         NS_SYMBOL = 32,
  34         NS_ITERATOR = 64,
  35 };
  36
  37 enum type {
  38         SYM_BASETYPE,
  39         SYM_NODE,
  40         SYM_PTR,
  41         SYM_FN,
  42         SYM_ARRAY,
  43         SYM_STRUCT,
  44         SYM_UNION,
  45         SYM_ENUM,
  46         SYM_TYPEDEF,
  47         SYM_TYPEOF,
  48         SYM_MEMBER,
  49         SYM_BITFIELD,
  50         SYM_LABEL,
  51 };
  52
  53 struct ctype {
  54         unsigned long modifiers;
  55         unsigned long alignment;
  56         unsigned int contextmask, context, as;
  57         struct symbol *base_type;
  58 };
  59
  60 struct symbol_op {
  61         int (*evaluate)(struct expression *);
  62         int (*expand)(struct expression *);
  63 };
  64
  65 struct symbol {
  66         enum namespace namespace:8;
  67         enum type type:8;
  68         struct position pos;            /* Where this symbol was declared */
  69         struct ident *ident;            /* What identifier this symbol is associated with */
  70         struct symbol *next_id;         /* Next semantic symbol that shares this identifier */
  71         struct symbol **id_list;        /* Backpointer to symbol list head */
  72         struct symbol   *replace;       /* What is this symbol shadowed by in copy-expression */
  73         struct scope    *scope;
  74         struct symbol   *same_symbol;
  75         struct symbol_op *op;
  76
  77         struct /* preprocessor_sym */ {
  78                 struct token *expansion;
  79                 struct token *arglist;
  80         };
  81
  82         struct /* ctype_sym */ {
  83                 unsigned long   offset;
  84                 unsigned int    bit_size;
  85                 unsigned int    bit_offset:8,
  86                                 fieldwidth:8,
  87                                 arg_count:10,
  88                                 variadic:1,
  89                                 used:1,
  90                                 initialized:1,
  91                                 expanding:1;
  92                 struct expression *array_size;
  93                 struct ctype ctype;
  94                 struct symbol_list *arguments;
  95                 struct statement *stmt;
  96                 struct symbol_list *symbol_list;
  97                 struct expression *initializer;
  98                 long long value;                /* Initial value */
  99         };
 100         union /* backend */ {
 101                 struct basic_block *bb_target;  /* label */
 102                 void *aux;                      /* Auxiliary info, eg. backend information */
 103         };
 104 };
 105
 106 /* Modifiers */
 107 #define MOD_AUTO        0x0001
 108 #define MOD_REGISTER    0x0002
 109 #define MOD_STATIC      0x0004
 110 #define MOD_EXTERN      0x0008
 111
 112 #define MOD_STORAGE     (MOD_AUTO | MOD_REGISTER | MOD_STATIC | MOD_EXTERN | MOD_INLINE | MOD_TOPLEVEL)
 113
 114 #define MOD_CONST       0x0010
 115 #define MOD_VOLATILE    0x0020
 116 #define MOD_SIGNED      0x0040
 117 #define MOD_UNSIGNED    0x0080
 118
 119 #define MOD_CHAR        0x0100
 120 #define MOD_SHORT       0x0200
 121 #define MOD_LONG        0x0400
 122 #define MOD_LONGLONG    0x0800
 123
 124 #define MOD_TYPEDEF     0x1000
 125 #define MOD_STRUCTOF    0x2000
 126 #define MOD_UNIONOF     0x4000
 127 #define MOD_ENUMOF      0x8000
 128
 129 #define MOD_TYPEOF      0x10000
 130 #define MOD_ATTRIBUTE   0x20000
 131 #define MOD_INLINE      0x40000
 132 #define MOD_ADDRESSABLE 0x80000
 133
 134 #define MOD_NOCAST      0x100000
 135 #define MOD_NODEREF     0x200000
 136 #define MOD_ACCESSED    0x400000
 137 #define MOD_TOPLEVEL    0x800000        // scoping..
 138
 139 #define MOD_LABEL       0x1000000
 140 #define MOD_ASSIGNED    0x2000000
 141 #define MOD_TYPE        0x4000000
 142 #define MOD_SAFE        0x8000000       // non-null/non-trapping pointer
 143
 144 #define MOD_USERTYPE    0x10000000
 145 #define MOD_FORCE       0x20000000
 146 #define MOD_EXPLICITLY_SIGNED   0x40000000
 147
 148 /* Basic types */
 149 extern struct symbol    void_type,
 150                         int_type,
 151                         label_type,
 152                         fp_type,
 153                         vector_type,
 154                         bad_type;
 155
 156 /* C types */
 157 extern struct symbol    bool_ctype, void_ctype, type_ctype,
 158                         char_ctype, uchar_ctype,
 159                         short_ctype, ushort_ctype,
 160                         int_ctype, uint_ctype,
 161                         long_ctype, ulong_ctype,
 162                         llong_ctype, ullong_ctype,
 163                         float_ctype, double_ctype, ldouble_ctype,
 164                         string_ctype, ptr_ctype, lazy_ptr_ctype,
 165                         incomplete_ctype;
 166
 167
 168 /* Basic identifiers */
 169 extern struct ident     sizeof_ident,
 170                         alignof_ident,
 171                         __alignof_ident,
 172                         __alignof___ident,
 173                         if_ident,
 174                         else_ident,
 175                         switch_ident,
 176                         case_ident,
 177                         default_ident,
 178                         break_ident,
 179                         continue_ident,
 180                         for_ident,
 181                         while_ident,
 182                         do_ident,
 183                         goto_ident,
 184                         return_ident;
 185
 186 extern struct ident     __asm___ident,
 187                         __asm_ident,
 188                         asm_ident,
 189                         __volatile___ident,
 190                         __volatile_ident,
 191                         volatile_ident,
 192                         __attribute___ident,
 193                         __attribute_ident,
 194                         defined_ident,
 195                         __VA_ARGS___ident,
 196                         __LINE___ident,
 197                         __FILE___ident,
 198                         pragma_ident;
 199
 200 #define symbol_is_typename(sym) ((sym)->type == SYM_TYPE)
 201
 202 extern struct symbol_list *used_list;
 203
 204 extern void access_symbol(struct symbol *);
 205
 206 extern const char * type_difference(struct symbol *target, struct symbol *source,
 207         unsigned long target_mod_ignore, unsigned long source_mod_ignore);
 208
 209 extern struct symbol *lookup_symbol(struct ident *, enum namespace);
 210 extern void init_symbols(void);
 211 extern void init_ctype(void);
 212 extern struct symbol *alloc_symbol(struct position, int type);
 213 extern void show_type(struct symbol *);
 214 extern const char *modifier_string(unsigned long mod);
 215 extern void show_symbol(struct symbol *);
 216 extern void show_type_list(struct symbol *);
 217 extern void show_symbol_list(struct symbol_list *, const char *);
 218 extern void add_symbol(struct symbol_list **, struct symbol *);
 219 extern void bind_symbol(struct symbol *, struct ident *, enum namespace);
 220
 221 extern struct symbol *examine_symbol_type(struct symbol *);
 222 extern void examine_simple_symbol_type(struct symbol *);
 223 extern const char *show_typename(struct symbol *sym);
 224
 225 extern void debug_symbol(struct symbol *);
 226 extern void merge_type(struct symbol *sym, struct symbol *base_type);
 227 extern void check_declaration(struct symbol *sym);
 228
 229 static inline int is_int_type(struct symbol *type)
 230 {
 231         if (type->type == SYM_NODE)
 232                 type = type->ctype.base_type;
 233         return (type->type == SYM_ENUM) ||
 234                (type->type == SYM_BITFIELD) ||
 235                type->ctype.base_type == &int_type;
 236 }
 237
 238 #endif /* SEMANTIC_H */