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_ERROR:
  97                 return 0;
  98         case TYPE_ATOMIC:
  99                 hash = hash_atomic_type(&type->atomic);
 100                 break;
 101         case TYPE_ENUM:
 102                 hash = hash_enum_type(&type->enumt);
 103                 break;
 104         case TYPE_COMPOUND_STRUCT:
 105         case TYPE_COMPOUND_UNION:
 106                 hash = hash_compound_type(&type->compound);
 107                 break;
 108         case TYPE_FUNCTION:
 109                 hash = hash_function_type(&type->function);
 110                 break;
 111         case TYPE_POINTER:
 112                 hash = hash_pointer_type(&type->pointer);
 113                 break;
 114         case TYPE_ARRAY:
 115                 hash = hash_array_type(&type->array);
 116                 break;
 117         case TYPE_BUILTIN:
 118                 hash = hash_ptr(type->builtin.symbol);
 119                 break;
 120         case TYPE_TYPEDEF:
 121                 hash = hash_ptr(type->typedeft.declaration);
 122                 break;
 123         case TYPE_TYPEOF:
 124                 hash = hash_typeof_type(&type->typeoft);
 125                 break;
 126         case TYPE_BITFIELD:
 127                 hash = hash_bitfield_type(&type->bitfield);
 128                 break;
 129         }
 130
 131         unsigned some_prime = 99991;
 132         hash ^= some_prime * type->base.qualifiers;
 133
 134         return hash;
 135 }
 136
 137 static bool atomic_types_equal(const atomic_type_t *type1,
 138                                const atomic_type_t *type2)
 139 {
 140         return type1->akind == type2->akind;
 141 }
 142
 143 static bool function_types_equal(const function_type_t *type1,
 144                                  const function_type_t *type2)
 145 {
 146         if(type1->return_type != type2->return_type)
 147                 return false;
 148         if(type1->variadic != type2->variadic)
 149                 return false;
 150         if(type1->unspecified_parameters != type2->unspecified_parameters)
 151                 return false;
 152         if(type1->kr_style_parameters != type2->kr_style_parameters)
 153                 return false;
 154
 155         function_parameter_t *param1 = type1->parameters;
 156         function_parameter_t *param2 = type2->parameters;
 157         while(param1 != NULL && param2 != NULL) {
 158                 if(param1->type != param2->type)
 159                         return false;
 160                 param1 = param1->next;
 161                 param2 = param2->next;
 162         }
 163         if(param1 != NULL || param2 != NULL)
 164                 return false;
 165
 166         return true;
 167 }
 168
 169 static bool pointer_types_equal(const pointer_type_t *type1,
 170                                 const pointer_type_t *type2)
 171 {
 172         return type1->points_to == type2->points_to;
 173 }
 174
 175 static bool array_types_equal(const array_type_t *type1,
 176                               const array_type_t *type2)
 177 {
 178         if(type1->element_type != type2->element_type)
 179                 return false;
 180         if(type1->is_variable != type2->is_variable)
 181                 return false;
 182         if(type1->is_static != type2->is_static)
 183                 return false;
 184         if(type1->size_constant != type2->size_constant)
 185                 return false;
 186
 187         /* never identify vla types, because we need them for caching calculated
 188          * sizes later in ast2firm */
 189         if(type1->is_vla || type2->is_vla)
 190                 return false;
 191
 192         /* TODO: compare size expressions for equality... */
 193
 194         return false;
 195 }
 196
 197 static bool builtin_types_equal(const builtin_type_t *type1,
 198                                 const builtin_type_t *type2)
 199 {
 200         return type1->symbol == type2->symbol;
 201 }
 202
 203 static bool compound_types_equal(const compound_type_t *type1,
 204                                  const compound_type_t *type2)
 205 {
 206         return type1->declaration == type2->declaration;
 207 }
 208
 209 static bool enum_types_equal(const enum_type_t *type1,
 210                              const enum_type_t *type2)
 211 {
 212         return type1->declaration == type2->declaration;
 213 }
 214
 215 static bool typedef_types_equal(const typedef_type_t *type1,
 216                                 const typedef_type_t *type2)
 217 {
 218         return type1->declaration == type2->declaration;
 219 }
 220
 221 static bool typeof_types_equal(const typeof_type_t *type1,
 222                                const typeof_type_t *type2)
 223 {
 224         if(type1->expression != type2->expression)
 225                 return false;
 226         if(type1->typeof_type != type2->typeof_type)
 227                 return false;
 228
 229         return true;
 230 }
 231
 232 static bool bitfield_types_equal(const bitfield_type_t *type1,
 233                                  const bitfield_type_t *type2)
 234 {
 235         if(type1->base != type2->base)
 236                 return false;
 237         /* TODO: compare size expression */
 238         return false;
 239 }
 240
 241 static bool types_equal(const type_t *type1, const type_t *type2)
 242 {
 243         if(type1 == type2)
 244                 return true;
 245         if(type1->kind != type2->kind)
 246                 return false;
 247         if(type1->base.qualifiers != type2->base.qualifiers)
 248                 return false;
 249
 250         switch(type1->kind) {
 251         case TYPE_ERROR:
 252                 /* Hmm, the error type is never equal */
 253                 return false;
 254         case TYPE_INVALID:
 255                 return false;
 256         case TYPE_ATOMIC:
 257                 return atomic_types_equal(&type1->atomic, &type2->atomic);
 258         case TYPE_ENUM:
 259                 return enum_types_equal(&type1->enumt, &type2->enumt);
 260         case TYPE_COMPOUND_STRUCT:
 261         case TYPE_COMPOUND_UNION:
 262                 return compound_types_equal(&type1->compound, &type2->compound);
 263         case TYPE_FUNCTION:
 264                 return function_types_equal(&type1->function, &type2->function);
 265         case TYPE_POINTER:
 266                 return pointer_types_equal(&type1->pointer, &type2->pointer);
 267         case TYPE_ARRAY:
 268                 return array_types_equal(&type1->array, &type2->array);
 269         case TYPE_BUILTIN:
 270                 return builtin_types_equal(&type1->builtin, &type2->builtin);
 271         case TYPE_TYPEOF:
 272                 return typeof_types_equal(&type1->typeoft, &type2->typeoft);
 273         case TYPE_TYPEDEF:
 274                 return typedef_types_equal(&type1->typedeft, &type2->typedeft);
 275         case TYPE_BITFIELD:
 276                 return bitfield_types_equal(&type1->bitfield, &type2->bitfield);
 277         }
 278
 279         abort();
 280 }
 281
 282 #define HashSet                    type_hash_t
 283 #define HashSetIterator            type_hash_iterator_t
 284 #define ValueType                  type_t*
 285 #define NullValue                  NULL
 286 #define DeletedValue               ((type_t*)-1)
 287 #define Hash(this, key)            hash_type(key)
 288 #define KeysEqual(this,key1,key2)  types_equal(key1, key2)
 289 #define SetRangeEmpty(ptr,size)    memset(ptr, 0, (size) * sizeof(*(ptr)))
 290
 291 #define hashset_init             _typehash_init
 292 #define hashset_init_size        _typehash_init_size
 293 #define hashset_destroy          _typehash_destroy
 294 #define hashset_insert           _typehash_insert
 295 #define hashset_remove           typehash_remove
 296 #define hashset_find             typehash_find
 297 #define hashset_size             typehash_size
 298 #define hashset_iterator_init    typehash_iterator_init
 299 #define hashset_iterator_next    typehash_iterator_next
 300 #define hashset_remove_iterator  typehash_remove_iterator
 301
 302 #include "adt/hashset.c"
 303
 304 static type_hash_t typehash;
 305
 306 void init_typehash(void)
 307 {
 308         _typehash_init(&typehash);
 309 }
 310
 311 void exit_typehash(void)
 312 {
 313         _typehash_destroy(&typehash);
 314 }
 315
 316 type_t *typehash_insert(type_t *type)
 317 {
 318         return _typehash_insert(&typehash, type);
 319 }