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_NONE,
  35         SYM_TYPE,
  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 size;
  68                         struct ctype ctype;
  69                         struct symbol_list *arguments;
  70                         struct statement *stmt;
  71                         struct symbol_list *symbol_list;
  72                         long long value;                /* Initial value */
  73                 };
  74         };
  75 };
  76
  77 /* Modifiers */
  78 #define MOD_AUTO        0x0001
  79 #define MOD_REGISTER    0x0002
  80 #define MOD_STATIC      0x0004
  81 #define MOD_EXTERN      0x0008
  82
  83 #define MOD_STORAGE     (MOD_AUTO | MOD_REGISTER | MOD_STATIC | MOD_EXTERN)
  84
  85 #define MOD_CONST       0x0010
  86 #define MOD_VOLATILE    0x0020
  87 #define MOD_SIGNED      0x0040
  88 #define MOD_UNSIGNED    0x0080
  89
  90 #define MOD_CHAR        0x0100
  91 #define MOD_SHORT       0x0200
  92 #define MOD_LONG        0x0400
  93 #define MOD_LONGLONG    0x0800
  94
  95 #define MOD_TYPEDEF     0x1000
  96 #define MOD_STRUCTOF    0x2000
  97 #define MOD_UNIONOF     0x4000
  98 #define MOD_ENUMOF      0x8000
  99
 100 #define MOD_TYPEOF      0x10000
 101 #define MOD_ATTRIBUTE   0x20000
 102
 103 /* Basic types */
 104 extern struct symbol    void_type,
 105                         int_type,
 106                         fp_type,
 107                         vector_type,
 108                         bad_type;
 109
 110 /* Basic identifiers */
 111 extern struct ident     sizeof_ident,
 112                         alignof_ident,
 113                         __alignof_ident,
 114                         __alignof___ident,
 115                         if_ident,
 116                         else_ident,
 117                         switch_ident,
 118                         case_ident,
 119                         default_ident,
 120                         break_ident,
 121                         continue_ident,
 122                         for_ident,
 123                         while_ident,
 124                         do_ident,
 125                         goto_ident,
 126                         return_ident;
 127
 128 extern struct ident     __asm___ident,
 129                         __asm_ident,
 130                         asm_ident,
 131                         __volatile___ident,
 132                         __volatile_ident,
 133                         volatile_ident,
 134                         __attribute___ident,
 135                         __attribute_ident;
 136
 137 #define symbol_is_typename(sym) ((sym)->type == SYM_TYPE)
 138
 139 extern struct symbol *lookup_symbol(struct ident *, enum namespace);
 140 extern void init_symbols(void);
 141 extern struct symbol *alloc_symbol(struct token *, int type);
 142 extern void show_type(struct symbol *);
 143 extern const char *modifier_string(unsigned long mod);
 144 extern void show_symbol(struct symbol *);
 145 extern void show_type_list(struct symbol *);
 146 extern void show_symbol_list(struct symbol_list *, const char *);
 147 extern void add_symbol(struct symbol_list **, struct symbol *);
 148 extern void bind_symbol(struct symbol *, struct ident *, enum namespace);
 149
 150 #endif /* SEMANTIC_H */