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->akind * 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_bitfield_type(const bitfield_type_t *type)
  81 {
  82         unsigned result  = hash_ptr(type->base);
  83         result          ^= 27172145;
  84
  85         return result;
  86 }
  87
  88 static unsigned hash_type(const type_t *type)
  89 {
  90         unsigned hash = 0;
  91
  92         switch(type->kind) {
  93         case TYPE_INVALID:
  94                 panic("internalizing void or invalid types not possible");
  95                 return 0;
  96         case TYPE_ATOMIC:
  97                 hash = hash_atomic_type(&type->atomic);
  98                 break;
  99         case TYPE_ENUM:
 100                 hash = hash_enum_type(&type->enumt);
 101                 break;
 102         case TYPE_COMPOUND_STRUCT:
 103         case TYPE_COMPOUND_UNION:
 104                 hash = hash_compound_type(&type->compound);
 105                 break;
 106         case TYPE_FUNCTION:
 107                 hash = hash_function_type(&type->function);
 108                 break;
 109         case TYPE_POINTER:
 110                 hash = hash_pointer_type(&type->pointer);
 111                 break;
 112         case TYPE_ARRAY:
 113                 hash = hash_array_type(&type->array);
 114                 break;
 115         case TYPE_BUILTIN:
 116                 hash = hash_ptr(type->builtin.symbol);
 117                 break;
 118         case TYPE_TYPEDEF:
 119                 hash = hash_ptr(type->typedeft.declaration);
 120                 break;
 121         case TYPE_TYPEOF:
 122                 hash = hash_typeof_type(&type->typeoft);
 123                 break;
 124         case TYPE_BITFIELD:
 125                 hash = hash_bitfield_type(&type->bitfield);
 126                 break;
 127         }
 128
 129         unsigned some_prime = 99991;
 130         hash ^= some_prime * type->base.qualifiers;
 131
 132         return hash;
 133 }
 134
 135 static bool atomic_types_equal(const atomic_type_t *type1,
 136                                const atomic_type_t *type2)
 137 {
 138         return type1->akind == type2->akind;
 139 }
 140
 141 static bool function_types_equal(const function_type_t *type1,
 142                                  const function_type_t *type2)
 143 {
 144         if(type1->return_type != type2->return_type)
 145                 return false;
 146         if(type1->variadic != type2->variadic)
 147                 return false;
 148         if(type1->unspecified_parameters != type2->unspecified_parameters)
 149                 return false;
 150         if(type1->kr_style_parameters != type2->kr_style_parameters)
 151                 return false;
 152
 153         function_parameter_t *param1 = type1->parameters;
 154         function_parameter_t *param2 = type2->parameters;
 155         while(param1 != NULL && param2 != NULL) {
 156                 if(param1->type != param2->type)
 157                         return false;
 158                 param1 = param1->next;
 159                 param2 = param2->next;
 160         }
 161         if(param1 != NULL || param2 != NULL)
 162                 return false;
 163
 164         return true;
 165 }
 166
 167 static bool pointer_types_equal(const pointer_type_t *type1,
 168                                 const pointer_type_t *type2)
 169 {
 170         return type1->points_to == type2->points_to;
 171 }
 172
 173 static bool array_types_equal(const array_type_t *type1,
 174                               const array_type_t *type2)
 175 {
 176         if(type1->element_type != type2->element_type)
 177                 return false;
 178         if(type1->is_variable != type2->is_variable)
 179                 return false;
 180         if(type1->is_static != type2->is_static)
 181                 return false;
 182
 183         /* TODO: compare size expressions for equality... */
 184
 185         return false;
 186 }
 187
 188 static bool builtin_types_equal(const builtin_type_t *type1,
 189                                 const builtin_type_t *type2)
 190 {
 191         return type1->symbol == type2->symbol;
 192 }
 193
 194 static bool compound_types_equal(const compound_type_t *type1,
 195                                  const compound_type_t *type2)
 196 {
 197         return type1->declaration == type2->declaration;
 198 }
 199
 200 static bool enum_types_equal(const enum_type_t *type1,
 201                              const enum_type_t *type2)
 202 {
 203         return type1->declaration == type2->declaration;
 204 }
 205
 206 static bool typedef_types_equal(const typedef_type_t *type1,
 207                                 const typedef_type_t *type2)
 208 {
 209         return type1->declaration == type2->declaration;
 210 }
 211
 212 static bool typeof_types_equal(const typeof_type_t *type1,
 213                                const typeof_type_t *type2)
 214 {
 215         if(type1->expression != type2->expression)
 216                 return false;
 217         if(type1->typeof_type != type2->typeof_type)
 218                 return false;
 219
 220         return true;
 221 }
 222
 223 static bool bitfield_types_equal(const bitfield_type_t *type1,
 224                                  const bitfield_type_t *type2)
 225 {
 226         if(type1->base != type2->base)
 227                 return false;
 228         /* TODO: compare size expression */
 229         return false;
 230 }
 231
 232 static bool types_equal(const type_t *type1, const type_t *type2)
 233 {
 234         if(type1 == type2)
 235                 return true;
 236         if(type1->kind != type2->kind)
 237                 return false;
 238         if(type1->base.qualifiers != type2->base.qualifiers)
 239                 return false;
 240
 241         switch(type1->kind) {
 242         case TYPE_INVALID:
 243                 return false;
 244         case TYPE_ATOMIC:
 245                 return atomic_types_equal(&type1->atomic, &type2->atomic);
 246         case TYPE_ENUM:
 247                 return enum_types_equal(&type1->enumt, &type2->enumt);
 248         case TYPE_COMPOUND_STRUCT:
 249         case TYPE_COMPOUND_UNION:
 250                 return compound_types_equal(&type1->compound, &type2->compound);
 251         case TYPE_FUNCTION:
 252                 return function_types_equal(&type1->function, &type2->function);
 253         case TYPE_POINTER:
 254                 return pointer_types_equal(&type1->pointer, &type2->pointer);
 255         case TYPE_ARRAY:
 256                 return array_types_equal(&type1->array, &type2->array);
 257         case TYPE_BUILTIN:
 258                 return builtin_types_equal(&type1->builtin, &type2->builtin);
 259         case TYPE_TYPEOF:
 260                 return typeof_types_equal(&type1->typeoft, &type2->typeoft);
 261         case TYPE_TYPEDEF:
 262                 return typedef_types_equal(&type1->typedeft, &type2->typedeft);
 263         case TYPE_BITFIELD:
 264                 return bitfield_types_equal(&type1->bitfield, &type2->bitfield);
 265         }
 266
 267         abort();
 268 }
 269
 270 #define HashSet                    type_hash_t
 271 #define HashSetIterator            type_hash_iterator_t
 272 #define ValueType                  type_t*
 273 #define NullValue                  NULL
 274 #define DeletedValue               ((type_t*)-1)
 275 #define Hash(this, key)            hash_type(key)
 276 #define KeysEqual(this,key1,key2)  types_equal(key1, key2)
 277 #define SetRangeEmpty(ptr,size)    memset(ptr, 0, (size) * sizeof(*(ptr)))
 278
 279 #define hashset_init             _typehash_init
 280 #define hashset_init_size        _typehash_init_size
 281 #define hashset_destroy          _typehash_destroy
 282 #define hashset_insert           _typehash_insert
 283 #define hashset_remove           typehash_remove
 284 #define hashset_find             typehash_find
 285 #define hashset_size             typehash_size
 286 #define hashset_iterator_init    typehash_iterator_init
 287 #define hashset_iterator_next    typehash_iterator_next
 288 #define hashset_remove_iterator  typehash_remove_iterator
 289
 290 #include "adt/hashset.c"
 291
 292 static type_hash_t typehash;
 293
 294 void init_typehash(void)
 295 {
 296         _typehash_init(&typehash);
 297 }
 298
 299 void exit_typehash(void)
 300 {
 301         _typehash_destroy(&typehash);
 302 }
 303
 304 type_t *typehash_insert(type_t *type)
 305 {
 306         return _typehash_insert(&typehash, type);
 307 }