improved union/struct parsing
[cparser] / type_hash.c
1 #include <config.h>
2
3 #include "type_hash.h"
4
5 #include "adt/error.h"
6 #include "type_t.h"
7
8 #include <assert.h>
9
10 #define HashSet         type_hash_t
11 #define HashSetIterator type_hash_iterator_t
12 #define ValueType       type_t*
13 #include "adt/hashset.h"
14 #undef ValueType
15 #undef HashSetIterator
16 #undef HashSet
17
18 static
19 unsigned hash_ptr(const void *ptr)
20 {
21         unsigned ptr_int = ((char*) ptr - (char*) NULL);
22         return ptr_int >> 3;
23 }
24
25 static
26 unsigned hash_atomic_type(const atomic_type_t *type)
27 {
28         unsigned some_prime = 27644437;
29
30         return type->atype * some_prime;
31 }
32
33 static
34 unsigned hash_pointer_type(const pointer_type_t *type)
35 {
36         return hash_ptr(type->points_to);
37 }
38
39 static
40 unsigned hash_compound_type(const compound_type_t *type)
41 {
42         unsigned result = hash_ptr(type->symbol);
43
44         return result;
45 }
46
47 static
48 unsigned hash_type(const type_t *type);
49
50 static
51 unsigned hash_method_type(const method_type_t *type)
52 {
53         unsigned result = hash_ptr(type->result_type);
54
55         method_parameter_t *parameter = type->parameters;
56         while(parameter != NULL) {
57                 result ^= hash_ptr(parameter);
58                 parameter = parameter->next;
59         }
60
61         return result;
62 }
63
64 static
65 unsigned hash_enum_type(const enum_type_t *type)
66 {
67         unsigned result = hash_ptr(type->symbol);
68
69         /* TODO */
70
71         return result;
72 }
73
74 static
75 unsigned hash_type(const type_t *type)
76 {
77         unsigned hash;
78
79         switch(type->type) {
80         case TYPE_INVALID:
81                 panic("internalizing void or invalid types not possible");
82                 return 0;
83         case TYPE_ATOMIC:
84                 hash = hash_atomic_type((const atomic_type_t*) type);
85                 break;
86         case TYPE_ENUM:
87                 hash = hash_enum_type((const enum_type_t*) type);
88                 break;
89         case TYPE_COMPOUND_STRUCT:
90         case TYPE_COMPOUND_UNION:
91                 hash = hash_compound_type((const compound_type_t*) type);
92                 break;
93         case TYPE_METHOD:
94                 hash = hash_method_type((const method_type_t*) type);
95                 break;
96         case TYPE_POINTER:
97                 hash = hash_pointer_type((const pointer_type_t*) type);
98                 break;
99         case TYPE_BUILTIN:
100                 hash = hash_ptr(((const builtin_type_t*) type)->symbol);
101                 break;
102         }
103
104         unsigned some_prime = 99991;
105         hash ^= some_prime * type->qualifiers;
106
107         return hash;
108 }
109
110 static
111 int atomic_types_equal(const atomic_type_t *type1, const atomic_type_t *type2)
112 {
113         return type1->atype == type2->atype;
114 }
115
116 static
117 int compound_types_equal(const compound_type_t *type1,
118                          const compound_type_t *type2)
119 {
120         if(type1->type.type != type2->type.type)
121                 return 0;
122         if(type1->symbol != type2->symbol)
123                 return 0;
124
125         if(type1->symbol == NULL) {
126                 /* previous tests should already have checked for this */
127                 assert(type1 != type2);
128                 /* anonymous types are only equal if they are the very same type */
129                 return 0;
130         } else {
131                 /* non-anonymous types are equal if they have the same symbol */
132                 /* TODO: is this correct */
133                 return 1;
134         }
135
136 #if 0
137         declaration_t *entry1 = type1->context.declarations;
138         declaration_t *entry2 = type2->context.declarations;
139
140         while(entry1 != NULL && entry2 != NULL) {
141                 if(entry1->type != entry2->type)
142                         return 0;
143                 if(entry1->symbol != entry2->symbol)
144                         return 0;
145                 entry1 = entry1->next;
146                 entry2 = entry2->next;
147         }
148         if(entry1 != NULL || entry2 != NULL)
149                 return 0;
150 #endif
151
152         return 1;
153 }
154
155 static
156 int method_types_equal(const method_type_t *type1, const method_type_t *type2)
157 {
158         if(type1->result_type != type2->result_type)
159                 return 0;
160
161         method_parameter_t *param1 = type1->parameters;
162         method_parameter_t *param2 = type2->parameters;
163         while(param1 != NULL && param2 != NULL) {
164                 if(param1->type != param2->type)
165                         return 0;
166                 param1 = param1->next;
167                 param2 = param2->next;
168         }
169         if(param1 != NULL || param2 != NULL)
170                 return 0;
171
172         return 1;
173 }
174
175 static
176 int pointer_types_equal(const pointer_type_t *type1,
177                         const pointer_type_t *type2)
178 {
179         return type1->points_to == type2->points_to;
180 }
181
182 static
183 int enum_types_equal(const enum_type_t *type1, const enum_type_t *type2)
184 {
185         if(type1->symbol != NULL && type1->symbol == type2->symbol)
186                 return 1;
187
188         enum_entry_t *entry1 = type1->entries;
189         enum_entry_t *entry2 = type2->entries;
190         while(entry1 != NULL && entry2 != NULL) {
191                 if(entry1->symbol != entry2->symbol)
192                         return 0;
193                 /* TODO: compare expressions */
194                 entry1 = entry1->next;
195                 entry2 = entry2->next;
196         }
197         if(entry1 != NULL || entry2 != NULL)
198                 return 0;
199
200         return 1;
201 }
202
203 static
204 int builtin_types_equal(const builtin_type_t *type1,
205                         const builtin_type_t *type2)
206 {
207         return type1->symbol == type2->symbol;
208 }
209
210 static
211 int types_equal(const type_t *type1, const type_t *type2)
212 {
213         if(type1 == type2)
214                 return 1;
215         if(type1->type != type2->type)
216                 return 0;
217         if(type1->qualifiers != type2->qualifiers)
218                 return 0;
219
220         switch(type1->type) {
221         case TYPE_INVALID:
222                 return 0;
223         case TYPE_ATOMIC:
224                 return atomic_types_equal((const atomic_type_t*) type1,
225                                           (const atomic_type_t*) type2);
226         case TYPE_COMPOUND_STRUCT:
227         case TYPE_COMPOUND_UNION:
228                 return compound_types_equal((const compound_type_t*) type1,
229                                             (const compound_type_t*) type2);
230         case TYPE_ENUM:
231                 return enum_types_equal((const enum_type_t*) type1,
232                                         (const enum_type_t*) type2);
233         case TYPE_METHOD:
234                 return method_types_equal((const method_type_t*) type1,
235                                           (const method_type_t*) type2);
236         case TYPE_POINTER:
237                 return pointer_types_equal((const pointer_type_t*) type1,
238                                            (const pointer_type_t*) type2);
239         case TYPE_BUILTIN:
240                 return builtin_types_equal((const builtin_type_t*) type1,
241                                            (const builtin_type_t*) type2);
242         }
243
244         abort();
245 }
246
247 #define HashSet                    type_hash_t
248 #define HashSetIterator            type_hash_iterator_t
249 #define ValueType                  type_t*
250 #define NullValue                  NULL
251 #define DeletedValue               ((type_t*)-1)
252 #define Hash(this, key)            hash_type(key)
253 #define KeysEqual(this,key1,key2)  types_equal(key1, key2)
254 #define SetRangeEmpty(ptr,size)    memset(ptr, 0, (size) * sizeof(*(ptr)))
255
256 #define hashset_init             _typehash_init
257 #define hashset_init_size        _typehash_init_size
258 #define hashset_destroy          _typehash_destroy
259 #define hashset_insert           _typehash_insert
260 #define hashset_remove           typehash_remove
261 #define hashset_find             typehash_find
262 #define hashset_size             typehash_size
263 #define hashset_iterator_init    typehash_iterator_init
264 #define hashset_iterator_next    typehash_iterator_next
265 #define hashset_remove_iterator  typehash_remove_iterator
266
267 #include "adt/hashset.c"
268
269 static type_hash_t typehash;
270
271 void init_typehash(void)
272 {
273         _typehash_init(&typehash);
274 }
275
276 void exit_typehash(void)
277 {
278         _typehash_destroy(&typehash);
279 }
280
281 type_t *typehash_insert(type_t *type)
282 {
283         return _typehash_insert(&typehash, type);
284 }