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,  // Also used for unions and enums.
  31         NS_LABEL = 8,
  32         NS_SYMBOL = 16,
  33         NS_ITERATOR = 32,
  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_op {
  60         int (*evaluate)(struct expression *);
  61         int (*expand)(struct expression *);
  62 };
  63
  64 struct symbol {
  65         enum namespace namespace:8;
  66         enum type type:8;
  67         struct position pos;            /* Where this symbol was declared */
  68         struct ident *ident;            /* What identifier this symbol is associated with */
  69         struct symbol *next_id;         /* Next semantic symbol that shares this identifier */
  70         struct symbol **id_list;        /* Backpointer to symbol list head */
  71         struct symbol   *replace;       /* What is this symbol shadowed by in copy-expression */
  72         struct scope    *scope;
  73         struct symbol   *same_symbol;
  74         struct symbol_op *op;
  75
  76         struct /* preprocessor_sym */ {
  77                 struct token *expansion;
  78                 struct token *arglist;
  79         };
  80
  81         struct /* ctype_sym */ {
  82                 unsigned long   offset;
  83                 unsigned int    bit_size;
  84                 unsigned int    bit_offset:8,
  85                                 fieldwidth:8,
  86                                 arg_count:10,
  87                                 variadic:1,
  88                                 used:1,
  89                                 initialized:1,
  90                                 expanding:1;
  91                 struct expression *array_size;
  92                 struct ctype ctype;
  93                 struct symbol_list *arguments;
  94                 struct statement *stmt;
  95                 struct symbol_list *symbol_list;
  96                 struct statement *inline_stmt;
  97                 struct symbol_list *inline_symbol_list;
  98                 struct expression *initializer;
  99                 long long value;                /* Initial value */
 100         };
 101         union /* backend */ {
 102                 struct basic_block *bb_target;  /* label */
 103                 void *aux;                      /* Auxiliary info, eg. backend information */
 104         };
 105 };
 106
 107 /* Modifiers */
 108 #define MOD_AUTO        0x0001
 109 #define MOD_REGISTER    0x0002
 110 #define MOD_STATIC      0x0004
 111 #define MOD_EXTERN      0x0008
 112
 113 #define MOD_STORAGE     (MOD_AUTO | MOD_REGISTER | MOD_STATIC | MOD_EXTERN | MOD_INLINE | MOD_TOPLEVEL)
 114
 115 #define MOD_CONST       0x0010
 116 #define MOD_VOLATILE    0x0020
 117 #define MOD_SIGNED      0x0040
 118 #define MOD_UNSIGNED    0x0080
 119
 120 #define MOD_CHAR        0x0100
 121 #define MOD_SHORT       0x0200
 122 #define MOD_LONG        0x0400
 123 #define MOD_LONGLONG    0x0800
 124
 125 #define MOD_TYPEDEF     0x1000
 126 #define MOD_STRUCTOF    0x2000
 127 #define MOD_UNIONOF     0x4000
 128 #define MOD_ENUMOF      0x8000
 129
 130 #define MOD_TYPEOF      0x10000
 131 #define MOD_ATTRIBUTE   0x20000
 132 #define MOD_INLINE      0x40000
 133 #define MOD_ADDRESSABLE 0x80000
 134
 135 #define MOD_NOCAST      0x100000
 136 #define MOD_NODEREF     0x200000
 137 #define MOD_ACCESSED    0x400000
 138 #define MOD_TOPLEVEL    0x800000        // scoping..
 139
 140 #define MOD_LABEL       0x1000000
 141 #define MOD_ASSIGNED    0x2000000
 142 #define MOD_TYPE        0x4000000
 143 #define MOD_SAFE        0x8000000       // non-null/non-trapping pointer
 144
 145 #define MOD_USERTYPE    0x10000000
 146 #define MOD_FORCE       0x20000000
 147 #define MOD_EXPLICITLY_SIGNED   0x40000000
 148
 149 /* Basic types */
 150 extern struct symbol    void_type,
 151                         int_type,
 152                         label_type,
 153                         fp_type,
 154                         vector_type,
 155                         bad_type;
 156
 157 /* C types */
 158 extern struct symbol    bool_ctype, void_ctype, type_ctype,
 159                         char_ctype, uchar_ctype,
 160                         short_ctype, ushort_ctype,
 161                         int_ctype, uint_ctype,
 162                         long_ctype, ulong_ctype,
 163                         llong_ctype, ullong_ctype,
 164                         float_ctype, double_ctype, ldouble_ctype,
 165                         string_ctype, ptr_ctype, lazy_ptr_ctype,
 166                         incomplete_ctype;
 167
 168
 169 #define __IDENT(n,str) \
 170         extern struct ident n
 171 #include "ident-list.h"
 172
 173 #define symbol_is_typename(sym) ((sym)->type == SYM_TYPE)
 174
 175 extern struct symbol_list *used_list;
 176
 177 extern void access_symbol(struct symbol *);
 178
 179 extern const char * type_difference(struct symbol *target, struct symbol *source,
 180         unsigned long target_mod_ignore, unsigned long source_mod_ignore);
 181
 182 extern struct symbol *lookup_symbol(struct ident *, enum namespace);
 183 extern void init_symbols(void);
 184 extern void init_ctype(void);
 185 extern struct symbol *alloc_symbol(struct position, int type);
 186 extern void show_type(struct symbol *);
 187 extern const char *modifier_string(unsigned long mod);
 188 extern void show_symbol(struct symbol *);
 189 extern void show_type_list(struct symbol *);
 190 extern void show_symbol_list(struct symbol_list *, const char *);
 191 extern void add_symbol(struct symbol_list **, struct symbol *);
 192 extern void bind_symbol(struct symbol *, struct ident *, enum namespace);
 193
 194 extern struct symbol *examine_symbol_type(struct symbol *);
 195 extern void examine_simple_symbol_type(struct symbol *);
 196 extern const char *show_typename(struct symbol *sym);
 197
 198 extern void debug_symbol(struct symbol *);
 199 extern void merge_type(struct symbol *sym, struct symbol *base_type);
 200 extern void check_declaration(struct symbol *sym);
 201
 202 static inline int is_int_type(const struct symbol *type)
 203 {
 204         if (type->type == SYM_NODE)
 205                 type = type->ctype.base_type;
 206         return (type->type == SYM_ENUM) ||
 207                (type->type == SYM_BITFIELD) ||
 208                type->ctype.base_type == &int_type;
 209 }
 210
 211 static inline int is_bitfield_type(const struct symbol *type)
 212 {
 213         if (type->type == SYM_NODE)
 214                 type = type->ctype.base_type;
 215         return (type->type == SYM_BITFIELD);
 216 }
 217
 218 #endif /* SEMANTIC_H */