symbol.h

   1 #ifndef SEMANTIC_H
   2 #define SEMANTIC_H
   3 /*
   4  * Basic symbol and namespace definitions.
   5  *
   6  * Copyright (C) 2003 Linus Torvalds, all rights reserved.
   7  */
   8
   9 #include "token.h"
  10
  11 /*
  12  * An identifier with semantic meaning is a "symbol".
  13  *
  14  * There's a 1:n relationship: each symbol is always
  15  * associated with one identifier, while each identifier
  16  * can have one or more semantic meanings due to C scope
  17  * rules.
  18  *
  19  * The progression is symbol -> token -> identifier. The
  20  * token contains the information on where the symbol was
  21  * declared.
  22  */
  23 enum namespace {
  24         NS_NONE,
  25         NS_PREPROCESSOR,
  26         NS_TYPEDEF,
  27         NS_STRUCT,
  28         NS_ENUM,
  29         NS_LABEL,
  30         NS_SYMBOL,
  31 };
  32
  33 enum type {
  34         SYM_BASETYPE,
  35         SYM_NODE,
  36         SYM_PTR,
  37         SYM_FN,
  38         SYM_ARRAY,
  39         SYM_STRUCT,
  40         SYM_UNION,
  41         SYM_ENUM,
  42         SYM_TYPEDEF,
  43         SYM_MEMBER,
  44         SYM_BITFIELD,
  45 };
  46
  47 struct ctype {
  48         unsigned long modifiers;
  49         struct symbol *base_type;
  50 };
  51
  52 struct symbol {
  53         enum namespace namespace:8;
  54         enum type type:8;
  55         struct token *token;            /* Where this symbol was declared */
  56         struct token *ident;            /* What identifier this symbol is associated with */
  57         struct symbol *next_id;         /* Next semantic symbol that shares this identifier */
  58         struct symbol **id_list;        /* Backpointer to symbol list head */
  59         union {
  60                 struct preprocessor_sym {
  61                         int busy;
  62                         struct token *expansion;
  63                         struct token *arglist;
  64                 };
  65                 struct ctype_symbol {
  66                         struct symbol *next;            /* Next symbol at this level */
  67                         unsigned long   offset;
  68                         unsigned int    bit_size;
  69                         unsigned int    alignment:24,
  70                                         bit_offset:8;
  71                         int     array_size;
  72                         struct ctype ctype;
  73                         struct symbol_list *arguments;
  74                         struct statement *stmt;
  75                         struct symbol_list *symbol_list;
  76                         long long value;                /* Initial value */
  77                         int fieldwidth;
  78                         int arg_count:10, variadic:1;
  79                 };
  80         };
  81 };
  82
  83 /* Modifiers */
  84 #define MOD_AUTO        0x0001
  85 #define MOD_REGISTER    0x0002
  86 #define MOD_STATIC      0x0004
  87 #define MOD_EXTERN      0x0008
  88
  89 #define MOD_STORAGE     (MOD_AUTO | MOD_REGISTER | MOD_STATIC | MOD_EXTERN)
  90
  91 #define MOD_CONST       0x0010
  92 #define MOD_VOLATILE    0x0020
  93 #define MOD_SIGNED      0x0040
  94 #define MOD_UNSIGNED    0x0080
  95
  96 #define MOD_CHAR        0x0100
  97 #define MOD_SHORT       0x0200
  98 #define MOD_LONG        0x0400
  99 #define MOD_LONGLONG    0x0800
 100
 101 #define MOD_TYPEDEF     0x1000
 102 #define MOD_STRUCTOF    0x2000
 103 #define MOD_UNIONOF     0x4000
 104 #define MOD_ENUMOF      0x8000
 105
 106 #define MOD_TYPEOF      0x10000
 107 #define MOD_ATTRIBUTE   0x20000
 108
 109 /* Basic types */
 110 extern struct symbol    void_type,
 111                         int_type,
 112                         fp_type,
 113                         vector_type,
 114                         bad_type;
 115
 116 /* C types */
 117 extern struct symbol    bool_ctype, void_ctype,
 118                         char_ctype, uchar_ctype,
 119                         short_ctype, ushort_ctype,
 120                         int_ctype, uint_ctype,
 121                         long_ctype, ulong_ctype,
 122                         llong_ctype, ullong_ctype,
 123                         float_ctype, double_ctype, ldouble_ctype,
 124                         string_ctype, ptr_ctype;
 125
 126
 127 /* Basic identifiers */
 128 extern struct ident     sizeof_ident,
 129                         alignof_ident,
 130                         __alignof_ident,
 131                         __alignof___ident,
 132                         if_ident,
 133                         else_ident,
 134                         switch_ident,
 135                         case_ident,
 136                         default_ident,
 137                         break_ident,
 138                         continue_ident,
 139                         for_ident,
 140                         while_ident,
 141                         do_ident,
 142                         goto_ident,
 143                         return_ident;
 144
 145 extern struct ident     __asm___ident,
 146                         __asm_ident,
 147                         asm_ident,
 148                         __volatile___ident,
 149                         __volatile_ident,
 150                         volatile_ident,
 151                         __attribute___ident,
 152                         __attribute_ident;
 153
 154 #define symbol_is_typename(sym) ((sym)->type == SYM_TYPE)
 155
 156 extern struct symbol *lookup_symbol(struct ident *, enum namespace);
 157 extern void init_symbols(void);
 158 extern struct symbol *alloc_symbol(struct token *, int type);
 159 extern void show_type(struct symbol *);
 160 extern const char *modifier_string(unsigned long mod);
 161 extern void show_symbol(struct symbol *);
 162 extern void show_type_list(struct symbol *);
 163 extern void show_symbol_list(struct symbol_list *, const char *);
 164 extern void add_symbol(struct symbol_list **, struct symbol *);
 165 extern void bind_symbol(struct symbol *, struct ident *, enum namespace);
 166
 167 extern void examine_symbol_type(struct symbol *);
 168 extern void examine_simple_symbol_type(struct symbol *);
 169
 170 #endif /* SEMANTIC_H */