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                 };
  73         };
  74 };
  75
  76 /* Modifiers */
  77 #define SYM_AUTO        0x0001
  78 #define SYM_REGISTER    0x0002
  79 #define SYM_STATIC      0x0004
  80 #define SYM_EXTERN      0x0008
  81
  82 #define SYM_CONST       0x0010
  83 #define SYM_VOLATILE    0x0020
  84 #define SYM_SIGNED      0x0040
  85 #define SYM_UNSIGNED    0x0080
  86
  87 #define SYM_CHAR        0x0100
  88 #define SYM_SHORT       0x0200
  89 #define SYM_LONG        0x0400
  90 #define SYM_LONGLONG    0x0800
  91
  92 #define SYM_TYPEDEF     0x1000
  93 #define SYM_STRUCTOF    0x2000
  94 #define SYM_UNIONOF     0x4000
  95 #define SYM_ENUMOF      0x8000
  96
  97 #define SYM_TYPEOF      0x10000
  98 #define SYM_ATTRIBUTE   0x20000
  99
 100 /* Basic types */
 101 extern struct symbol    void_type,
 102                         int_type,
 103                         fp_type,
 104                         vector_type,
 105                         bad_type;
 106
 107 /* Basic identifiers */
 108 extern struct ident     sizeof_ident,
 109                         alignof_ident,
 110                         __alignof_ident,
 111                         __alignof___ident,
 112                         if_ident,
 113                         else_ident,
 114                         switch_ident,
 115                         case_ident,
 116                         default_ident,
 117                         break_ident,
 118                         continue_ident,
 119                         for_ident,
 120                         while_ident,
 121                         do_ident,
 122                         goto_ident,
 123                         return_ident;
 124
 125 extern struct ident     __asm___ident,
 126                         __asm_ident,
 127                         asm_ident,
 128                         __volatile___ident,
 129                         __volatile_ident,
 130                         volatile_ident,
 131                         __attribute___ident,
 132                         __attribute_ident;
 133
 134 #define symbol_is_typename(sym) ((sym)->type == SYM_TYPE)
 135
 136 extern struct symbol *lookup_symbol(struct ident *, enum namespace);
 137 extern void init_symbols(void);
 138 extern struct symbol *alloc_symbol(struct token *, int type);
 139 extern void show_type(struct symbol *);
 140 extern const char *modifier_string(unsigned long mod);
 141 extern void show_symbol(struct symbol *);
 142 extern void show_type_list(struct symbol *);
 143 extern void show_symbol_list(struct symbol_list *, const char *);
 144 extern void add_symbol(struct symbol_list **, struct symbol *);
 145 extern void bind_symbol(struct symbol *, struct ident *, enum namespace);
 146
 147 #endif /* SEMANTIC_H */