nsz Git - cparser/blob - type_hash.c

   1 #include <config.h>
   2
   3 #include <stdbool.h>
   4
   5 #include "type_hash.h"
   6
   7 #include "adt/error.h"
   8 #include "type_t.h"
   9
  10 #include <assert.h>
  11
  12 #define HashSet         type_hash_t
  13 #define HashSetIterator type_hash_iterator_t
  14 #define ValueType       type_t*
  15 #include "adt/hashset.h"
  16 #undef ValueType
  17 #undef HashSetIterator
  18 #undef HashSet
  19
  20 /* TODO: ^= is a bad way of combining hashes since most addresses are very
  21  * similar */
  22
  23 static unsigned hash_ptr(const void *ptr)
  24 {
  25         unsigned ptr_int = ((char*) ptr - (char*) NULL);
  26         return ptr_int >> 3;
  27 }
  28
  29 static unsigned hash_atomic_type(const atomic_type_t *type)
  30 {
  31         unsigned some_prime = 27644437;
  32         unsigned result     = type->atype * some_prime;
  33
  34         return result;
  35 }
  36
  37 static unsigned hash_pointer_type(const pointer_type_t *type)
  38 {
  39         return hash_ptr(type->points_to);
  40 }
  41
  42 static unsigned hash_array_type(const array_type_t *type)
  43 {
  44         return hash_ptr(type->element_type);
  45 }
  46
  47 static unsigned hash_compound_type(const compound_type_t *type)
  48 {
  49         return hash_ptr(type->declaration);
  50 }
  51
  52 static unsigned hash_type(const type_t *type);
  53
  54 static unsigned hash_function_type(const function_type_t *type)
  55 {
  56         unsigned result = hash_ptr(type->result_type);
  57
  58         function_parameter_t *parameter = type->parameters;
  59         while(parameter != NULL) {
  60                 result   ^= hash_ptr(parameter->type);
  61                 parameter = parameter->next;
  62         }
  63
  64         return result;
  65 }
  66
  67 static unsigned hash_enum_type(const enum_type_t *type)
  68 {
  69         return hash_ptr(type->declaration);
  70 }
  71
  72 static unsigned hash_typeof_type(const typeof_type_t *type)
  73 {
  74         unsigned result = hash_ptr(type->expression);
  75         result         ^= hash_ptr(type->typeof_type);
  76
  77         return result;
  78 }
  79
  80 static unsigned hash_type(const type_t *type)
  81 {
  82         unsigned hash = 0;
  83
  84         switch(type->type) {
  85         case TYPE_COUNT:
  86         case TYPE_INVALID:
  87                 panic("internalizing void or invalid types not possible");
  88                 return 0;
  89         case TYPE_ATOMIC:
  90                 hash = hash_atomic_type(&type->atomic);
  91                 break;
  92         case TYPE_ENUM:
  93                 hash = hash_enum_type(&type->enumt);
  94                 break;
  95         case TYPE_COMPOUND_STRUCT:
  96         case TYPE_COMPOUND_UNION:
  97                 hash = hash_compound_type(&type->compound);
  98                 break;
  99         case TYPE_FUNCTION:
 100                 hash = hash_function_type(&type->function);
 101                 break;
 102         case TYPE_POINTER:
 103                 hash = hash_pointer_type(&type->pointer);
 104                 break;
 105         case TYPE_ARRAY:
 106                 hash = hash_array_type(&type->array);
 107                 break;
 108         case TYPE_BUILTIN:
 109                 hash = hash_ptr(type->builtin.symbol);
 110                 break;
 111         case TYPE_TYPEDEF:
 112                 hash = hash_ptr(type->typedeft.declaration);
 113                 break;
 114         case TYPE_TYPEOF:
 115                 hash = hash_typeof_type(&type->typeoft);
 116                 break;
 117         }
 118
 119         unsigned some_prime = 99991;
 120         hash ^= some_prime * type->base.qualifiers;
 121
 122         return hash;
 123 }
 124
 125 static bool atomic_types_equal(const atomic_type_t *type1,
 126                                const atomic_type_t *type2)
 127 {
 128         return type1->atype == type2->atype;
 129 }
 130
 131 static bool function_types_equal(const function_type_t *type1,
 132                                  const function_type_t *type2)
 133 {
 134         if(type1->result_type != type2->result_type)
 135                 return false;
 136         if(type1->variadic != type2->variadic)
 137                 return false;
 138         if(type1->unspecified_parameters != type2->unspecified_parameters)
 139                 return false;
 140
 141         function_parameter_t *param1 = type1->parameters;
 142         function_parameter_t *param2 = type2->parameters;
 143         while(param1 != NULL && param2 != NULL) {
 144                 if(param1->type != param2->type)
 145                         return false;
 146                 param1 = param1->next;
 147                 param2 = param2->next;
 148         }
 149         if(param1 != NULL || param2 != NULL)
 150                 return false;
 151
 152         return true;
 153 }
 154
 155 static bool pointer_types_equal(const pointer_type_t *type1,
 156                                 const pointer_type_t *type2)
 157 {
 158         return type1->points_to == type2->points_to;
 159 }
 160
 161 static bool array_types_equal(const array_type_t *type1,
 162                               const array_type_t *type2)
 163 {
 164         if(type1->element_type != type2->element_type)
 165                 return false;
 166         if(type1->is_variable != type2->is_variable)
 167                 return false;
 168         if(type1->is_static != type2->is_static)
 169                 return false;
 170         /* TODO: compare expressions for equality... */
 171         if(type1->size != type2->size)
 172                 return false;
 173
 174         return true;
 175 }
 176
 177 static bool builtin_types_equal(const builtin_type_t *type1,
 178                                 const builtin_type_t *type2)
 179 {
 180         return type1->symbol == type2->symbol;
 181 }
 182
 183 static bool compound_types_equal(const compound_type_t *type1,
 184                                  const compound_type_t *type2)
 185 {
 186         return type1->declaration == type2->declaration;
 187 }
 188
 189 static bool enum_types_equal(const enum_type_t *type1,
 190                              const enum_type_t *type2)
 191 {
 192         return type1->declaration == type2->declaration;
 193 }
 194
 195 static bool typedef_types_equal(const typedef_type_t *type1,
 196                                 const typedef_type_t *type2)
 197 {
 198         return type1->declaration == type2->declaration;
 199 }
 200
 201 static bool typeof_types_equal(const typeof_type_t *type1,
 202                                const typeof_type_t *type2)
 203 {
 204         if(type1->expression != type2->expression)
 205                 return false;
 206         if(type1->typeof_type != type2->typeof_type)
 207                 return false;
 208
 209         return true;
 210 }
 211
 212 static bool types_equal(const type_t *type1, const type_t *type2)
 213 {
 214         if(type1 == type2)
 215                 return true;
 216         if(type1->type != type2->type)
 217                 return false;
 218         if(type1->base.qualifiers != type2->base.qualifiers)
 219                 return false;
 220
 221         switch(type1->type) {
 222         case TYPE_COUNT:
 223         case TYPE_INVALID:
 224                 return false;
 225         case TYPE_ATOMIC:
 226                 return atomic_types_equal(&type1->atomic, &type2->atomic);
 227         case TYPE_ENUM:
 228                 return enum_types_equal(&type1->enumt, &type2->enumt);
 229         case TYPE_COMPOUND_STRUCT:
 230         case TYPE_COMPOUND_UNION:
 231                 return compound_types_equal(&type1->compound, &type2->compound);
 232         case TYPE_FUNCTION:
 233                 return function_types_equal(&type1->function, &type2->function);
 234         case TYPE_POINTER:
 235                 return pointer_types_equal(&type1->pointer, &type2->pointer);
 236         case TYPE_ARRAY:
 237                 return array_types_equal(&type1->array, &type2->array);
 238         case TYPE_BUILTIN:
 239                 return builtin_types_equal(&type1->builtin, &type2->builtin);
 240         case TYPE_TYPEOF:
 241                 return typeof_types_equal(&type1->typeoft, &type2->typeoft);
 242         case TYPE_TYPEDEF:
 243                 return typedef_types_equal(&type1->typedeft, &type2->typedeft);
 244         }
 245
 246         abort();
 247 }
 248
 249 #define HashSet                    type_hash_t
 250 #define HashSetIterator            type_hash_iterator_t
 251 #define ValueType                  type_t*
 252 #define NullValue                  NULL
 253 #define DeletedValue               ((type_t*)-1)
 254 #define Hash(this, key)            hash_type(key)
 255 #define KeysEqual(this,key1,key2)  types_equal(key1, key2)
 256 #define SetRangeEmpty(ptr,size)    memset(ptr, 0, (size) * sizeof(*(ptr)))
 257
 258 #define hashset_init             _typehash_init
 259 #define hashset_init_size        _typehash_init_size
 260 #define hashset_destroy          _typehash_destroy
 261 #define hashset_insert           _typehash_insert
 262 #define hashset_remove           typehash_remove
 263 #define hashset_find             typehash_find
 264 #define hashset_size             typehash_size
 265 #define hashset_iterator_init    typehash_iterator_init
 266 #define hashset_iterator_next    typehash_iterator_next
 267 #define hashset_remove_iterator  typehash_remove_iterator
 268
 269 #include "adt/hashset.c"
 270
 271 static type_hash_t typehash;
 272
 273 void init_typehash(void)
 274 {
 275         _typehash_init(&typehash);
 276 }
 277
 278 void exit_typehash(void)
 279 {
 280         _typehash_destroy(&typehash);
 281 }
 282
 283 type_t *typehash_insert(type_t *type)
 284 {
 285         return _typehash_insert(&typehash, type);
 286 }