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         NS_INVISIBLEMACRO = 128,
  36 };
  37
  38 enum type {
  39         SYM_UNINITIALIZED,
  40         SYM_PREPROCESSOR,
  41         SYM_BASETYPE,
  42         SYM_NODE,
  43         SYM_PTR,
  44         SYM_FN,
  45         SYM_ARRAY,
  46         SYM_STRUCT,
  47         SYM_UNION,
  48         SYM_ENUM,
  49         SYM_TYPEDEF,
  50         SYM_TYPEOF,
  51         SYM_MEMBER,
  52         SYM_BITFIELD,
  53         SYM_LABEL,
  54         SYM_RESTRICT,
  55         SYM_BAD,
  56 };
  57
  58 struct ctype {
  59         unsigned long modifiers;
  60         unsigned long alignment;
  61         unsigned int in_context, out_context, as;
  62         struct symbol *base_type;
  63 };
  64
  65 struct symbol_op {
  66         int (*evaluate)(struct expression *);
  67         int (*expand)(struct expression *, int);
  68 };
  69
  70 extern int expand_safe_p(struct expression *expr, int cost);
  71 extern int expand_constant_p(struct expression *expr, int cost);
  72
  73 struct symbol {
  74         enum namespace namespace:8;
  75         enum type type:8;
  76         unsigned char used:1, weak:1;
  77         struct position pos;            /* Where this symbol was declared */
  78         struct ident *ident;            /* What identifier this symbol is associated with */
  79         struct symbol *next_id;         /* Next semantic symbol that shares this identifier */
  80         struct symbol **id_list;        /* Backpointer to symbol list head */
  81         struct symbol   *replace;       /* What is this symbol shadowed by in copy-expression */
  82         struct scope    *scope;
  83         struct symbol   *same_symbol;
  84         struct symbol_op *op;
  85
  86         union {
  87                 struct /* NS_MACRO */ {
  88                         struct token *expansion;
  89                         struct token *arglist;
  90                 };
  91                 struct /* NS_PREPROCESSOR */ {
  92                         int (*handler)(struct stream *, struct token **, struct token *);
  93                 };
  94                 struct /* NS_SYMBOL */ {
  95                         unsigned long   offset;
  96                         int             bit_size;
  97                         unsigned int    bit_offset:8,
  98                                         arg_count:10,
  99                                         variadic:1,
 100                                         initialized:1,
 101                                         examined:1,
 102                                         expanding:1;
 103                         struct expression *array_size;
 104                         struct ctype ctype;
 105                         struct symbol_list *arguments;
 106                         struct statement *stmt;
 107                         struct symbol_list *symbol_list;
 108                         struct statement *inline_stmt;
 109                         struct symbol_list *inline_symbol_list;
 110                         struct expression *initializer;
 111                         long long value;                /* Initial value */
 112                 };
 113         };
 114         union /* backend */ {
 115                 struct basic_block *bb_target;  /* label */
 116                 void *aux;                      /* Auxiliary info, eg. backend information */
 117         };
 118         pseudo_t pseudo;
 119 };
 120
 121 /* Modifiers */
 122 #define MOD_AUTO        0x0001
 123 #define MOD_REGISTER    0x0002
 124 #define MOD_STATIC      0x0004
 125 #define MOD_EXTERN      0x0008
 126
 127 #define MOD_CONST       0x0010
 128 #define MOD_VOLATILE    0x0020
 129 #define MOD_SIGNED      0x0040
 130 #define MOD_UNSIGNED    0x0080
 131
 132 #define MOD_CHAR        0x0100
 133 #define MOD_SHORT       0x0200
 134 #define MOD_LONG        0x0400
 135 #define MOD_LONGLONG    0x0800
 136
 137 #define MOD_TYPEDEF     0x1000
 138 #define MOD_STRUCTOF    0x2000
 139 #define MOD_UNIONOF     0x4000
 140 #define MOD_ENUMOF      0x8000
 141
 142 #define MOD_TYPEOF      0x10000
 143 #define MOD_ATTRIBUTE   0x20000
 144 #define MOD_INLINE      0x40000
 145 #define MOD_ADDRESSABLE 0x80000
 146
 147 #define MOD_NOCAST      0x100000
 148 #define MOD_NODEREF     0x200000
 149 #define MOD_ACCESSED    0x400000
 150 #define MOD_TOPLEVEL    0x800000        // scoping..
 151
 152 #define MOD_LABEL       0x1000000
 153 #define MOD_ASSIGNED    0x2000000
 154 #define MOD_TYPE        0x4000000
 155 #define MOD_SAFE        0x8000000       // non-null/non-trapping pointer
 156
 157 #define MOD_USERTYPE    0x10000000
 158 #define MOD_FORCE       0x20000000
 159 #define MOD_EXPLICITLY_SIGNED   0x40000000
 160 #define MOD_BITWISE     0x80000000
 161
 162 #define MOD_NONLOCAL    (MOD_EXTERN | MOD_TOPLEVEL)
 163 #define MOD_STORAGE     (MOD_AUTO | MOD_REGISTER | MOD_STATIC | MOD_EXTERN | MOD_INLINE | MOD_TOPLEVEL)
 164 #define MOD_SPECIALBITS (MOD_STRUCTOF | MOD_UNIONOF | MOD_ENUMOF | MOD_ATTRIBUTE | MOD_TYPEOF)
 165 #define MOD_SIGNEDNESS  (MOD_SIGNED | MOD_UNSIGNED | MOD_EXPLICITLY_SIGNED)
 166 #define MOD_SPECIFIER   (MOD_CHAR | MOD_SHORT | MOD_LONG | MOD_LONGLONG | MOD_SIGNEDNESS)
 167 #define MOD_SIZE        (MOD_CHAR | MOD_SHORT | MOD_LONG | MOD_LONGLONG)
 168 #define MOD_IGNORE (MOD_TOPLEVEL | MOD_STORAGE | MOD_ADDRESSABLE |      \
 169         MOD_ASSIGNED | MOD_USERTYPE | MOD_FORCE | MOD_ACCESSED | MOD_EXPLICITLY_SIGNED)
 170
 171
 172 /* Current parsing/evaluation function */
 173 extern struct symbol *current_fn;
 174
 175 /* Abstract types */
 176 extern struct symbol    int_type,
 177                         fp_type;
 178
 179 /* C types */
 180 extern struct symbol    bool_ctype, void_ctype, type_ctype,
 181                         char_ctype, schar_ctype, uchar_ctype,
 182                         short_ctype, sshort_ctype, ushort_ctype,
 183                         int_ctype, sint_ctype, uint_ctype,
 184                         long_ctype, slong_ctype, ulong_ctype,
 185                         llong_ctype, sllong_ctype, ullong_ctype,
 186                         float_ctype, double_ctype, ldouble_ctype,
 187                         string_ctype, ptr_ctype, lazy_ptr_ctype,
 188                         incomplete_ctype, label_ctype, bad_ctype;
 189
 190
 191 #define __IDENT(n,str,res) \
 192         extern struct ident n
 193 #include "ident-list.h"
 194
 195 #define symbol_is_typename(sym) ((sym)->type == SYM_TYPE)
 196
 197 extern struct symbol_list *translation_unit_used_list;
 198
 199 extern void access_symbol(struct symbol *);
 200
 201 extern const char * type_difference(struct symbol *target, struct symbol *source,
 202         unsigned long target_mod_ignore, unsigned long source_mod_ignore);
 203
 204 extern struct symbol *lookup_symbol(struct ident *, enum namespace);
 205 extern struct symbol *create_symbol(int stream, const char *name, int type, int namespace);
 206 extern void init_symbols(void);
 207 extern void init_ctype(void);
 208 extern struct symbol *alloc_symbol(struct position, int type);
 209 extern void show_type(struct symbol *);
 210 extern const char *modifier_string(unsigned long mod);
 211 extern void show_symbol(struct symbol *);
 212 extern int show_symbol_expr_init(struct symbol *sym);
 213 extern void show_type_list(struct symbol *);
 214 extern void show_symbol_list(struct symbol_list *, const char *);
 215 extern void add_symbol(struct symbol_list **, struct symbol *);
 216 extern void bind_symbol(struct symbol *, struct ident *, enum namespace);
 217
 218 extern struct symbol *examine_symbol_type(struct symbol *);
 219 extern void examine_simple_symbol_type(struct symbol *);
 220 extern const char *show_typename(struct symbol *sym);
 221
 222 extern void debug_symbol(struct symbol *);
 223 extern void merge_type(struct symbol *sym, struct symbol *base_type);
 224 extern void check_declaration(struct symbol *sym);
 225
 226 static inline struct symbol *get_base_type(const struct symbol *sym)
 227 {
 228         return examine_symbol_type(sym->ctype.base_type);
 229 }
 230
 231 static inline int is_int_type(const struct symbol *type)
 232 {
 233         if (type->type == SYM_NODE)
 234                 type = type->ctype.base_type;
 235         if (type->type == SYM_ENUM)
 236                 type = type->ctype.base_type;
 237         return type->type == SYM_BITFIELD ||
 238                type->ctype.base_type == &int_type;
 239 }
 240
 241 static inline int get_sym_type(struct symbol *type)
 242 {
 243         if (type->type == SYM_NODE)
 244                 type = type->ctype.base_type;
 245         if (type->type == SYM_ENUM)
 246                 type = type->ctype.base_type;
 247         return type->type;
 248 }
 249
 250 #define is_restricted_type(type) (get_sym_type(type) == SYM_RESTRICT)
 251 #define is_bitfield_type(type)   (get_sym_type(type) == SYM_BITFIELD)
 252 extern int is_ptr_type(struct symbol *);
 253
 254 #endif /* SEMANTIC_H */