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  *
   8  *  Licensed under the Open Software License version 1.1
   9  */
  10
  11 #include "token.h"
  12
  13 /*
  14  * An identifier with semantic meaning is a "symbol".
  15  *
  16  * There's a 1:n relationship: each symbol is always
  17  * associated with one identifier, while each identifier
  18  * can have one or more semantic meanings due to C scope
  19  * rules.
  20  *
  21  * The progression is symbol -> token -> identifier. The
  22  * token contains the information on where the symbol was
  23  * declared.
  24  */
  25 enum namespace {
  26         NS_NONE,
  27         NS_PREPROCESSOR,
  28         NS_TYPEDEF,
  29         NS_STRUCT,
  30         NS_ENUM,
  31         NS_LABEL,
  32         NS_SYMBOL,
  33         NS_ITERATOR,
  34 };
  35
  36 enum type {
  37         SYM_BASETYPE,
  38         SYM_NODE,
  39         SYM_PTR,
  40         SYM_FN,
  41         SYM_ARRAY,
  42         SYM_STRUCT,
  43         SYM_UNION,
  44         SYM_ENUM,
  45         SYM_TYPEDEF,
  46         SYM_TYPEOF,
  47         SYM_MEMBER,
  48         SYM_BITFIELD,
  49         SYM_LABEL,
  50 };
  51
  52 struct ctype {
  53         unsigned long modifiers;
  54         unsigned long alignment;
  55         unsigned int contextmask, context, as;
  56         struct symbol *base_type;
  57 };
  58
  59 struct symbol {
  60         enum namespace namespace:8;
  61         enum type type:8;
  62         struct position pos;            /* Where this symbol was declared */
  63         struct ident *ident;            /* What identifier this symbol is associated with */
  64         struct symbol *next_id;         /* Next semantic symbol that shares this identifier */
  65         struct symbol **id_list;        /* Backpointer to symbol list head */
  66         struct symbol   *replace;       /* What is this symbol shadowed by in copy-expression */
  67         struct scope    *scope;
  68         struct symbol   *same_symbol;
  69         int (*evaluate)(struct expression *);
  70
  71         struct /* preprocessor_sym */ {
  72                 struct token *expansion;
  73                 struct token *arglist;
  74         };
  75
  76         struct /* ctype_sym */ {
  77                 unsigned long   offset;
  78                 unsigned int    bit_size;
  79                 unsigned int    bit_offset:8,
  80                                 fieldwidth:8,
  81                                 arg_count:10,
  82                                 variadic:1,
  83                                 used:1,
  84                                 initialized:1;
  85                 int     array_size;
  86                 struct ctype ctype;
  87                 struct symbol_list *arguments;
  88                 struct statement *stmt;
  89                 struct symbol_list *symbol_list;
  90                 struct expression *initializer;
  91                 long long value;                /* Initial value */
  92         };
  93         void *aux;                              /* Auxiliary info, eg. backend information */
  94 };
  95
  96 /* Modifiers */
  97 #define MOD_AUTO        0x0001
  98 #define MOD_REGISTER    0x0002
  99 #define MOD_STATIC      0x0004
 100 #define MOD_EXTERN      0x0008
 101
 102 #define MOD_STORAGE     (MOD_AUTO | MOD_REGISTER | MOD_STATIC | MOD_EXTERN | MOD_INLINE | MOD_TOPLEVEL)
 103
 104 #define MOD_CONST       0x0010
 105 #define MOD_VOLATILE    0x0020
 106 #define MOD_SIGNED      0x0040
 107 #define MOD_UNSIGNED    0x0080
 108
 109 #define MOD_CHAR        0x0100
 110 #define MOD_SHORT       0x0200
 111 #define MOD_LONG        0x0400
 112 #define MOD_LONGLONG    0x0800
 113
 114 #define MOD_TYPEDEF     0x1000
 115 #define MOD_STRUCTOF    0x2000
 116 #define MOD_UNIONOF     0x4000
 117 #define MOD_ENUMOF      0x8000
 118
 119 #define MOD_TYPEOF      0x10000
 120 #define MOD_ATTRIBUTE   0x20000
 121 #define MOD_INLINE      0x40000
 122 #define MOD_ADDRESSABLE 0x80000
 123
 124 #define MOD_NOCAST      0x100000
 125 #define MOD_NODEREF     0x200000
 126 #define MOD_ACCESSED    0x400000
 127 #define MOD_TOPLEVEL    0x800000        // scoping..
 128
 129 #define MOD_LABEL       0x1000000
 130
 131 /* Basic types */
 132 extern struct symbol    void_type,
 133                         int_type,
 134                         label_type,
 135                         fp_type,
 136                         vector_type,
 137                         bad_type;
 138
 139 /* C types */
 140 extern struct symbol    bool_ctype, void_ctype,
 141                         char_ctype, uchar_ctype,
 142                         short_ctype, ushort_ctype,
 143                         int_ctype, uint_ctype,
 144                         long_ctype, ulong_ctype,
 145                         llong_ctype, ullong_ctype,
 146                         float_ctype, double_ctype, ldouble_ctype,
 147                         string_ctype, ptr_ctype, label_type;
 148
 149
 150 /* Basic identifiers */
 151 extern struct ident     sizeof_ident,
 152                         alignof_ident,
 153                         __alignof_ident,
 154                         __alignof___ident,
 155                         if_ident,
 156                         else_ident,
 157                         switch_ident,
 158                         case_ident,
 159                         default_ident,
 160                         break_ident,
 161                         continue_ident,
 162                         for_ident,
 163                         while_ident,
 164                         do_ident,
 165                         goto_ident,
 166                         return_ident;
 167
 168 extern struct ident     __asm___ident,
 169                         __asm_ident,
 170                         asm_ident,
 171                         __volatile___ident,
 172                         __volatile_ident,
 173                         volatile_ident,
 174                         __attribute___ident,
 175                         __attribute_ident,
 176                         pragma_ident;
 177
 178 #define symbol_is_typename(sym) ((sym)->type == SYM_TYPE)
 179
 180 extern struct symbol_list *used_list;
 181
 182 extern void access_symbol(struct symbol *);
 183
 184
 185 extern struct symbol *lookup_symbol(struct ident *, enum namespace);
 186 extern void init_symbols(void);
 187 extern struct symbol *alloc_symbol(struct position, int type);
 188 extern void show_type(struct symbol *);
 189 extern const char *modifier_string(unsigned long mod);
 190 extern void show_symbol(struct symbol *);
 191 extern void show_type_list(struct symbol *);
 192 extern void show_symbol_list(struct symbol_list *, const char *);
 193 extern void add_symbol(struct symbol_list **, struct symbol *);
 194 extern void bind_symbol(struct symbol *, struct ident *, enum namespace);
 195
 196 extern struct symbol *examine_symbol_type(struct symbol *);
 197 extern void examine_simple_symbol_type(struct symbol *);
 198 extern const char *show_typename(struct symbol *sym);
 199
 200 extern void debug_symbol(struct symbol *);
 201 extern void merge_type(struct symbol *sym, struct symbol *base_type);
 202 extern void check_declaration(struct symbol *sym);
 203
 204 #endif /* SEMANTIC_H */