4 * Basic symbol and namespace definitions.
6 * Copyright (C) 2003 Transmeta Corp.
9 * Licensed under the Open Software License version 1.1
15 * An identifier with semantic meaning is a "symbol".
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
22 * The progression is symbol -> token -> identifier. The
23 * token contains the information on where the symbol was
30 NS_STRUCT
= 4, // Also used for unions and enums.
35 NS_INVISIBLEMACRO
= 128,
59 struct expression
*context
;
63 extern struct context
*alloc_context(void);
65 DECLARE_PTR_LIST(context_list
, struct context
);
68 unsigned long modifiers
;
69 unsigned long alignment
;
70 struct context_list
*contexts
;
72 struct symbol
*base_type
;
76 int (*evaluate
)(struct expression
*);
77 int (*expand
)(struct expression
*, int);
80 extern int expand_safe_p(struct expression
*expr
, int cost
);
81 extern int expand_constant_p(struct expression
*expr
, int cost
);
84 enum namespace namespace:8;
86 unsigned char used
:1, weak
:1;
87 struct position pos
; /* Where this symbol was declared */
88 struct ident
*ident
; /* What identifier this symbol is associated with */
89 struct symbol
*next_id
; /* Next semantic symbol that shares this identifier */
90 struct symbol
**id_list
; /* Backpointer to symbol list head */
91 struct symbol
*replace
; /* What is this symbol shadowed by in copy-expression */
93 struct symbol
*same_symbol
;
97 struct /* NS_MACRO */ {
98 struct token
*expansion
;
99 struct token
*arglist
;
101 struct /* NS_PREPROCESSOR */ {
102 int (*handler
)(struct stream
*, struct token
**, struct token
*);
105 struct /* NS_SYMBOL */ {
106 unsigned long offset
;
108 unsigned int bit_offset
:8,
115 struct expression
*array_size
;
117 struct symbol_list
*arguments
;
118 struct statement
*stmt
;
119 struct symbol_list
*symbol_list
;
120 struct statement
*inline_stmt
;
121 struct symbol_list
*inline_symbol_list
;
122 struct expression
*initializer
;
123 long long value
; /* Initial value */
126 union /* backend */ {
127 struct basic_block
*bb_target
; /* label */
128 void *aux
; /* Auxiliary info, eg. backend information */
134 #define MOD_AUTO 0x0001
135 #define MOD_REGISTER 0x0002
136 #define MOD_STATIC 0x0004
137 #define MOD_EXTERN 0x0008
139 #define MOD_CONST 0x0010
140 #define MOD_VOLATILE 0x0020
141 #define MOD_SIGNED 0x0040
142 #define MOD_UNSIGNED 0x0080
144 #define MOD_CHAR 0x0100
145 #define MOD_SHORT 0x0200
146 #define MOD_LONG 0x0400
147 #define MOD_LONGLONG 0x0800
149 #define MOD_TYPEDEF 0x1000
150 #define MOD_STRUCTOF 0x2000
151 #define MOD_UNIONOF 0x4000
152 #define MOD_ENUMOF 0x8000
154 #define MOD_TYPEOF 0x10000
155 #define MOD_ATTRIBUTE 0x20000
156 #define MOD_INLINE 0x40000
157 #define MOD_ADDRESSABLE 0x80000
159 #define MOD_NOCAST 0x100000
160 #define MOD_NODEREF 0x200000
161 #define MOD_ACCESSED 0x400000
162 #define MOD_TOPLEVEL 0x800000 // scoping..
164 #define MOD_LABEL 0x1000000
165 #define MOD_ASSIGNED 0x2000000
166 #define MOD_TYPE 0x4000000
167 #define MOD_SAFE 0x8000000 // non-null/non-trapping pointer
169 #define MOD_USERTYPE 0x10000000
170 #define MOD_FORCE 0x20000000
171 #define MOD_EXPLICITLY_SIGNED 0x40000000
172 #define MOD_BITWISE 0x80000000
174 #define MOD_NONLOCAL (MOD_EXTERN | MOD_TOPLEVEL)
175 #define MOD_STORAGE (MOD_AUTO | MOD_REGISTER | MOD_STATIC | MOD_EXTERN | MOD_INLINE | MOD_TOPLEVEL)
176 #define MOD_SPECIALBITS (MOD_STRUCTOF | MOD_UNIONOF | MOD_ENUMOF | MOD_ATTRIBUTE | MOD_TYPEOF)
177 #define MOD_SIGNEDNESS (MOD_SIGNED | MOD_UNSIGNED | MOD_EXPLICITLY_SIGNED)
178 #define MOD_SPECIFIER (MOD_CHAR | MOD_SHORT | MOD_LONG | MOD_LONGLONG | MOD_SIGNEDNESS)
179 #define MOD_SIZE (MOD_CHAR | MOD_SHORT | MOD_LONG | MOD_LONGLONG)
180 #define MOD_IGNORE (MOD_TOPLEVEL | MOD_STORAGE | MOD_ADDRESSABLE | \
181 MOD_ASSIGNED | MOD_USERTYPE | MOD_FORCE | MOD_ACCESSED | MOD_EXPLICITLY_SIGNED)
184 /* Current parsing/evaluation function */
185 extern struct symbol
*current_fn
;
188 extern struct symbol int_type
,
192 extern struct symbol bool_ctype
, void_ctype
, type_ctype
,
193 char_ctype
, schar_ctype
, uchar_ctype
,
194 short_ctype
, sshort_ctype
, ushort_ctype
,
195 int_ctype
, sint_ctype
, uint_ctype
,
196 long_ctype
, slong_ctype
, ulong_ctype
,
197 llong_ctype
, sllong_ctype
, ullong_ctype
,
198 float_ctype
, double_ctype
, ldouble_ctype
,
199 string_ctype
, ptr_ctype
, lazy_ptr_ctype
,
200 incomplete_ctype
, label_ctype
, bad_ctype
;
202 /* Special internal symbols */
203 extern struct symbol zero_int
;
205 #define __IDENT(n,str,res) \
206 extern struct ident n
207 #include "ident-list.h"
209 #define symbol_is_typename(sym) ((sym)->type == SYM_TYPE)
211 extern struct symbol_list
*translation_unit_used_list
;
213 extern void access_symbol(struct symbol
*);
215 extern const char * type_difference(struct symbol
*target
, struct symbol
*source
,
216 unsigned long target_mod_ignore
, unsigned long source_mod_ignore
);
218 extern struct symbol
*lookup_symbol(struct ident
*, enum namespace);
219 extern struct symbol
*create_symbol(int stream
, const char *name
, int type
, int namespace);
220 extern void init_symbols(void);
221 extern void init_ctype(void);
222 extern struct symbol
*alloc_symbol(struct position
, int type
);
223 extern void show_type(struct symbol
*);
224 extern const char *modifier_string(unsigned long mod
);
225 extern void show_symbol(struct symbol
*);
226 extern int show_symbol_expr_init(struct symbol
*sym
);
227 extern void show_type_list(struct symbol
*);
228 extern void show_symbol_list(struct symbol_list
*, const char *);
229 extern void add_symbol(struct symbol_list
**, struct symbol
*);
230 extern void bind_symbol(struct symbol
*, struct ident
*, enum namespace);
232 extern struct symbol
*examine_symbol_type(struct symbol
*);
233 extern void examine_simple_symbol_type(struct symbol
*);
234 extern const char *show_typename(struct symbol
*sym
);
236 extern void debug_symbol(struct symbol
*);
237 extern void merge_type(struct symbol
*sym
, struct symbol
*base_type
);
238 extern void check_declaration(struct symbol
*sym
);
240 static inline struct symbol
*get_base_type(const struct symbol
*sym
)
242 return examine_symbol_type(sym
->ctype
.base_type
);
245 static inline int is_int_type(const struct symbol
*type
)
247 if (type
->type
== SYM_NODE
)
248 type
= type
->ctype
.base_type
;
249 if (type
->type
== SYM_ENUM
)
250 type
= type
->ctype
.base_type
;
251 return type
->type
== SYM_BITFIELD
||
252 type
->ctype
.base_type
== &int_type
;
255 static inline int is_enum_type(const struct symbol
*type
)
257 if (type
->type
== SYM_NODE
)
258 type
= type
->ctype
.base_type
;
259 return (type
->type
== SYM_ENUM
);
262 static inline int get_sym_type(struct symbol
*type
)
264 if (type
->type
== SYM_NODE
)
265 type
= type
->ctype
.base_type
;
266 if (type
->type
== SYM_ENUM
)
267 type
= type
->ctype
.base_type
;
271 #define is_restricted_type(type) (get_sym_type(type) == SYM_RESTRICT)
272 #define is_bitfield_type(type) (get_sym_type(type) == SYM_BITFIELD)
273 extern int is_ptr_type(struct symbol
*);
275 #endif /* SEMANTIC_H */