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_MACRO = 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         NS_PREPROCESSOR = 64,
  35 };
  36
  37 enum type {
  38         SYM_UNINITIALIZED,
  39         SYM_PREPROCESSOR,
  40         SYM_BASETYPE,
  41         SYM_NODE,
  42         SYM_PTR,
  43         SYM_FN,
  44         SYM_ARRAY,
  45         SYM_STRUCT,
  46         SYM_UNION,
  47         SYM_ENUM,
  48         SYM_TYPEDEF,
  49         SYM_TYPEOF,
  50         SYM_MEMBER,
  51         SYM_BITFIELD,
  52         SYM_LABEL,
  53         SYM_RESTRICT,
  54         SYM_BAD,
  55 };
  56
  57 struct ctype {
  58         unsigned long modifiers;
  59         unsigned long alignment;
  60         unsigned int in_context, out_context, as;
  61         struct symbol *base_type;
  62 };
  63
  64 struct symbol_op {
  65         int (*evaluate)(struct expression *);
  66         int (*expand)(struct expression *, int);
  67 };
  68
  69 extern int expand_safe_p(struct expression *expr, int cost);
  70 extern int expand_constant_p(struct expression *expr, int cost);
  71
  72 struct symbol {
  73         enum namespace namespace:8;
  74         enum type type:8;
  75         unsigned char used:1, weak:1;
  76         struct position pos;            /* Where this symbol was declared */
  77         struct ident *ident;            /* What identifier this symbol is associated with */
  78         struct symbol *next_id;         /* Next semantic symbol that shares this identifier */
  79         struct symbol **id_list;        /* Backpointer to symbol list head */
  80         struct symbol   *replace;       /* What is this symbol shadowed by in copy-expression */
  81         struct scope    *scope;
  82         struct symbol   *same_symbol;
  83         struct symbol_op *op;
  84
  85         union {
  86                 struct /* NS_MACRO */ {
  87                         struct token *expansion;
  88                         struct token *arglist;
  89                 };
  90                 struct /* NS_PREPROCESSOR */ {
  91                         int (*handler)(struct stream *, struct token **, struct token *);
  92                 };
  93                 struct /* NS_SYMBOL */ {
  94                         unsigned long   offset;
  95                         int             bit_size;
  96                         unsigned int    bit_offset:8,
  97                                         arg_count:10,
  98                                         variadic:1,
  99                                         initialized:1,
 100                                         examined:1,
 101                                         expanding:1;
 102                         struct expression *array_size;
 103                         struct ctype ctype;
 104                         struct symbol_list *arguments;
 105                         struct statement *stmt;
 106                         struct symbol_list *symbol_list;
 107                         struct statement *inline_stmt;
 108                         struct symbol_list *inline_symbol_list;
 109                         struct expression *initializer;
 110                         long long value;                /* Initial value */
 111                 };
 112         };
 113         union /* backend */ {
 114                 struct basic_block *bb_target;  /* label */
 115                 void *aux;                      /* Auxiliary info, eg. backend information */
 116         };
 117         pseudo_t pseudo;
 118 };
 119
 120 /* Modifiers */
 121 #define MOD_AUTO        0x0001
 122 #define MOD_REGISTER    0x0002
 123 #define MOD_STATIC      0x0004
 124 #define MOD_EXTERN      0x0008
 125
 126 #define MOD_CONST       0x0010
 127 #define MOD_VOLATILE    0x0020
 128 #define MOD_SIGNED      0x0040
 129 #define MOD_UNSIGNED    0x0080
 130
 131 #define MOD_CHAR        0x0100
 132 #define MOD_SHORT       0x0200
 133 #define MOD_LONG        0x0400
 134 #define MOD_LONGLONG    0x0800
 135
 136 #define MOD_TYPEDEF     0x1000
 137 #define MOD_STRUCTOF    0x2000
 138 #define MOD_UNIONOF     0x4000
 139 #define MOD_ENUMOF      0x8000
 140
 141 #define MOD_TYPEOF      0x10000
 142 #define MOD_ATTRIBUTE   0x20000
 143 #define MOD_INLINE      0x40000
 144 #define MOD_ADDRESSABLE 0x80000
 145
 146 #define MOD_NOCAST      0x100000
 147 #define MOD_NODEREF     0x200000
 148 #define MOD_ACCESSED    0x400000
 149 #define MOD_TOPLEVEL    0x800000        // scoping..
 150
 151 #define MOD_LABEL       0x1000000
 152 #define MOD_ASSIGNED    0x2000000
 153 #define MOD_TYPE        0x4000000
 154 #define MOD_SAFE        0x8000000       // non-null/non-trapping pointer
 155
 156 #define MOD_USERTYPE    0x10000000
 157 #define MOD_FORCE       0x20000000
 158 #define MOD_EXPLICITLY_SIGNED   0x40000000
 159 #define MOD_BITWISE     0x80000000
 160
 161 #define MOD_NONLOCAL    (MOD_EXTERN | MOD_TOPLEVEL)
 162 #define MOD_STORAGE     (MOD_AUTO | MOD_REGISTER | MOD_STATIC | MOD_EXTERN | MOD_INLINE | MOD_TOPLEVEL)
 163 #define MOD_SPECIALBITS (MOD_STRUCTOF | MOD_UNIONOF | MOD_ENUMOF | MOD_ATTRIBUTE | MOD_TYPEOF)
 164 #define MOD_SIGNEDNESS  (MOD_SIGNED | MOD_UNSIGNED | MOD_EXPLICITLY_SIGNED)
 165 #define MOD_SPECIFIER   (MOD_CHAR | MOD_SHORT | MOD_LONG | MOD_LONGLONG | MOD_SIGNEDNESS)
 166
 167 /* Current parsing/evaluation function */
 168 extern struct symbol *current_fn;
 169
 170 /* Abstract types */
 171 extern struct symbol    int_type,
 172                         fp_type;
 173
 174 /* C types */
 175 extern struct symbol    bool_ctype, void_ctype, type_ctype,
 176                         char_ctype, schar_ctype, uchar_ctype,
 177                         short_ctype, sshort_ctype, ushort_ctype,
 178                         int_ctype, sint_ctype, uint_ctype,
 179                         long_ctype, slong_ctype, ulong_ctype,
 180                         llong_ctype, sllong_ctype, ullong_ctype,
 181                         float_ctype, double_ctype, ldouble_ctype,
 182                         string_ctype, ptr_ctype, lazy_ptr_ctype,
 183                         incomplete_ctype, label_ctype, bad_ctype;
 184
 185
 186 #define __IDENT(n,str,res) \
 187         extern struct ident n
 188 #include "ident-list.h"
 189
 190 #define symbol_is_typename(sym) ((sym)->type == SYM_TYPE)
 191
 192 extern struct symbol_list *translation_unit_used_list;
 193
 194 extern void access_symbol(struct symbol *);
 195
 196 extern const char * type_difference(struct symbol *target, struct symbol *source,
 197         unsigned long target_mod_ignore, unsigned long source_mod_ignore);
 198
 199 extern struct symbol *lookup_symbol(struct ident *, enum namespace);
 200 extern struct symbol *create_symbol(int stream, const char *name, int type, int namespace);
 201 extern void init_symbols(void);
 202 extern void init_ctype(void);
 203 extern struct symbol *alloc_symbol(struct position, int type);
 204 extern void show_type(struct symbol *);
 205 extern const char *modifier_string(unsigned long mod);
 206 extern void show_symbol(struct symbol *);
 207 extern void show_type_list(struct symbol *);
 208 extern void show_symbol_list(struct symbol_list *, const char *);
 209 extern void add_symbol(struct symbol_list **, struct symbol *);
 210 extern void bind_symbol(struct symbol *, struct ident *, enum namespace);
 211
 212 extern struct symbol *examine_symbol_type(struct symbol *);
 213 extern void examine_simple_symbol_type(struct symbol *);
 214 extern const char *show_typename(struct symbol *sym);
 215
 216 extern void debug_symbol(struct symbol *);
 217 extern void merge_type(struct symbol *sym, struct symbol *base_type);
 218 extern void check_declaration(struct symbol *sym);
 219
 220 static inline int is_int_type(const struct symbol *type)
 221 {
 222         if (type->type == SYM_NODE)
 223                 type = type->ctype.base_type;
 224         if (type->type == SYM_ENUM)
 225                 type = type->ctype.base_type;
 226         return type->type == SYM_BITFIELD ||
 227                type->ctype.base_type == &int_type;
 228 }
 229
 230 static inline int get_sym_type(struct symbol *type)
 231 {
 232         if (type->type == SYM_NODE)
 233                 type = type->ctype.base_type;
 234         if (type->type == SYM_ENUM)
 235                 type = type->ctype.base_type;
 236         return type->type;
 237 }
 238
 239 #define is_restricted_type(type) (get_sym_type(type) == SYM_RESTRICT)
 240 #define is_bitfield_type(type)   (get_sym_type(type) == SYM_BITFIELD)
 241
 242 #endif /* SEMANTIC_H */