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->return_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->kind) {
  85         case TYPE_INVALID:
  86                 panic("internalizing void or invalid types not possible");
  87                 return 0;
  88         case TYPE_ATOMIC:
  89                 hash = hash_atomic_type(&type->atomic);
  90                 break;
  91         case TYPE_ENUM:
  92                 hash = hash_enum_type(&type->enumt);
  93                 break;
  94         case TYPE_COMPOUND_STRUCT:
  95         case TYPE_COMPOUND_UNION:
  96                 hash = hash_compound_type(&type->compound);
  97                 break;
  98         case TYPE_FUNCTION:
  99                 hash = hash_function_type(&type->function);
 100                 break;
 101         case TYPE_POINTER:
 102                 hash = hash_pointer_type(&type->pointer);
 103                 break;
 104         case TYPE_ARRAY:
 105                 hash = hash_array_type(&type->array);
 106                 break;
 107         case TYPE_BUILTIN:
 108                 hash = hash_ptr(type->builtin.symbol);
 109                 break;
 110         case TYPE_TYPEDEF:
 111                 hash = hash_ptr(type->typedeft.declaration);
 112                 break;
 113         case TYPE_TYPEOF:
 114                 hash = hash_typeof_type(&type->typeoft);
 115                 break;
 116         }
 117
 118         unsigned some_prime = 99991;
 119         hash ^= some_prime * type->base.qualifiers;
 120
 121         return hash;
 122 }
 123
 124 static bool atomic_types_equal(const atomic_type_t *type1,
 125                                const atomic_type_t *type2)
 126 {
 127         return type1->atype == type2->atype;
 128 }
 129
 130 static bool function_types_equal(const function_type_t *type1,
 131                                  const function_type_t *type2)
 132 {
 133         if(type1->return_type != type2->return_type)
 134                 return false;
 135         if(type1->variadic != type2->variadic)
 136                 return false;
 137         if(type1->unspecified_parameters != type2->unspecified_parameters)
 138                 return false;
 139         if(type1->kr_style_parameters != type2->kr_style_parameters)
 140                 return false;
 141
 142         function_parameter_t *param1 = type1->parameters;
 143         function_parameter_t *param2 = type2->parameters;
 144         while(param1 != NULL && param2 != NULL) {
 145                 if(param1->type != param2->type)
 146                         return false;
 147                 param1 = param1->next;
 148                 param2 = param2->next;
 149         }
 150         if(param1 != NULL || param2 != NULL)
 151                 return false;
 152
 153         return true;
 154 }
 155
 156 static bool pointer_types_equal(const pointer_type_t *type1,
 157                                 const pointer_type_t *type2)
 158 {
 159         return type1->points_to == type2->points_to;
 160 }
 161
 162 static bool array_types_equal(const array_type_t *type1,
 163                               const array_type_t *type2)
 164 {
 165         if(type1->element_type != type2->element_type)
 166                 return false;
 167         if(type1->is_variable != type2->is_variable)
 168                 return false;
 169         if(type1->is_static != type2->is_static)
 170                 return false;
 171         /* TODO: compare expressions for equality... */
 172         if(type1->size != type2->size)
 173                 return false;
 174
 175         return true;
 176 }
 177
 178 static bool builtin_types_equal(const builtin_type_t *type1,
 179                                 const builtin_type_t *type2)
 180 {
 181         return type1->symbol == type2->symbol;
 182 }
 183
 184 static bool compound_types_equal(const compound_type_t *type1,
 185                                  const compound_type_t *type2)
 186 {
 187         return type1->declaration == type2->declaration;
 188 }
 189
 190 static bool enum_types_equal(const enum_type_t *type1,
 191                              const enum_type_t *type2)
 192 {
 193         return type1->declaration == type2->declaration;
 194 }
 195
 196 static bool typedef_types_equal(const typedef_type_t *type1,
 197                                 const typedef_type_t *type2)
 198 {
 199         return type1->declaration == type2->declaration;
 200 }
 201
 202 static bool typeof_types_equal(const typeof_type_t *type1,
 203                                const typeof_type_t *type2)
 204 {
 205         if(type1->expression != type2->expression)
 206                 return false;
 207         if(type1->typeof_type != type2->typeof_type)
 208                 return false;
 209
 210         return true;
 211 }
 212
 213 static bool types_equal(const type_t *type1, const type_t *type2)
 214 {
 215         if(type1 == type2)
 216                 return true;
 217         if(type1->kind != type2->kind)
 218                 return false;
 219         if(type1->base.qualifiers != type2->base.qualifiers)
 220                 return false;
 221
 222         switch(type1->kind) {
 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 }