nsz Git - cparser/blob - type_hash.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2008 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <stdbool.h>
  23
  24 #include "type_hash.h"
  25
  26 #include "adt/error.h"
  27 #include "type_t.h"
  28
  29 #include <assert.h>
  30
  31 #define HashSet         type_hash_t
  32 #define HashSetIterator type_hash_iterator_t
  33 #define ValueType       type_t*
  34 #include "adt/hashset.h"
  35 #undef ValueType
  36 #undef HashSetIterator
  37 #undef HashSet
  38
  39 typedef struct type_hash_iterator_t  type_hash_iterator_t;
  40 typedef struct type_hash_t           type_hash_t;
  41
  42 /* TODO: ^= is a bad way of combining hashes since most addresses are very
  43  * similar */
  44
  45 static unsigned hash_ptr(const void *ptr)
  46 {
  47         unsigned ptr_int = ((char*) ptr - (char*) NULL);
  48         return ptr_int >> 3;
  49 }
  50
  51 static unsigned hash_atomic_type(const atomic_type_t *type)
  52 {
  53         unsigned some_prime = 27644437;
  54         unsigned result     = type->akind * some_prime;
  55
  56         return result;
  57 }
  58
  59 static unsigned hash_complex_type(const complex_type_t *type)
  60 {
  61         unsigned some_prime = 27644437;
  62         unsigned result     = type->akind * some_prime;
  63
  64         return result;
  65 }
  66
  67 static unsigned hash_imaginary_type(const imaginary_type_t *type)
  68 {
  69         unsigned some_prime = 27644437;
  70         unsigned result     = type->akind * some_prime;
  71
  72         return result;
  73 }
  74
  75 static unsigned hash_pointer_type(const pointer_type_t *type)
  76 {
  77         return hash_ptr(type->points_to);
  78 }
  79
  80 static unsigned hash_reference_type(const reference_type_t *type)
  81 {
  82         return hash_ptr(type->refers_to);
  83 }
  84
  85 static unsigned hash_array_type(const array_type_t *type)
  86 {
  87         return hash_ptr(type->element_type);
  88 }
  89
  90 static unsigned hash_compound_type(const compound_type_t *type)
  91 {
  92         return hash_ptr(type->compound);
  93 }
  94
  95 static unsigned hash_type(const type_t *type);
  96
  97 static unsigned hash_function_type(const function_type_t *type)
  98 {
  99         unsigned result = hash_ptr(type->return_type);
 100
 101         function_parameter_t *parameter = type->parameters;
 102         while (parameter != NULL) {
 103                 result   ^= hash_ptr(parameter->type);
 104                 parameter = parameter->next;
 105         }
 106         result += type->linkage;
 107         result += type->calling_convention;
 108
 109         return result;
 110 }
 111
 112 static unsigned hash_enum_type(const enum_type_t *type)
 113 {
 114         return hash_ptr(type->enume);
 115 }
 116
 117 static unsigned hash_typeof_type(const typeof_type_t *type)
 118 {
 119         unsigned result = hash_ptr(type->expression);
 120         result         ^= hash_ptr(type->typeof_type);
 121
 122         return result;
 123 }
 124
 125 static unsigned hash_bitfield_type(const bitfield_type_t *type)
 126 {
 127         unsigned result  = hash_ptr(type->base_type);
 128         result          ^= 27172145;
 129
 130         return result;
 131 }
 132
 133 static unsigned hash_type(const type_t *type)
 134 {
 135         unsigned hash = 0;
 136
 137         switch (type->kind) {
 138         case TYPE_INVALID:
 139                 panic("internalizing void or invalid types not possible");
 140                 return 0;
 141         case TYPE_ERROR:
 142                 return 0;
 143         case TYPE_ATOMIC:
 144                 hash = hash_atomic_type(&type->atomic);
 145                 break;
 146         case TYPE_COMPLEX:
 147                 hash = hash_complex_type(&type->complex);
 148                 break;
 149         case TYPE_IMAGINARY:
 150                 hash = hash_imaginary_type(&type->imaginary);
 151                 break;
 152         case TYPE_ENUM:
 153                 hash = hash_enum_type(&type->enumt);
 154                 break;
 155         case TYPE_COMPOUND_STRUCT:
 156         case TYPE_COMPOUND_UNION:
 157                 hash = hash_compound_type(&type->compound);
 158                 break;
 159         case TYPE_FUNCTION:
 160                 hash = hash_function_type(&type->function);
 161                 break;
 162         case TYPE_POINTER:
 163                 hash = hash_pointer_type(&type->pointer);
 164                 break;
 165         case TYPE_REFERENCE:
 166                 hash = hash_reference_type(&type->reference);
 167                 break;
 168         case TYPE_ARRAY:
 169                 hash = hash_array_type(&type->array);
 170                 break;
 171         case TYPE_BUILTIN:
 172                 hash = hash_ptr(type->builtin.symbol);
 173                 break;
 174         case TYPE_TYPEDEF:
 175                 hash = hash_ptr(type->typedeft.typedefe);
 176                 break;
 177         case TYPE_TYPEOF:
 178                 hash = hash_typeof_type(&type->typeoft);
 179                 break;
 180         case TYPE_BITFIELD:
 181                 hash = hash_bitfield_type(&type->bitfield);
 182                 break;
 183         }
 184
 185         unsigned some_prime = 99991;
 186         hash ^= some_prime * type->base.qualifiers;
 187
 188         return hash;
 189 }
 190
 191 static bool atomic_types_equal(const atomic_type_t *type1,
 192                                                            const atomic_type_t *type2)
 193 {
 194         return type1->akind == type2->akind;
 195 }
 196
 197 static bool complex_types_equal(const complex_type_t *type1,
 198                                                             const complex_type_t *type2)
 199 {
 200         return type1->akind == type2->akind;
 201 }
 202
 203 static bool imaginary_types_equal(const imaginary_type_t *type1,
 204                                                               const imaginary_type_t *type2)
 205 {
 206         return type1->akind == type2->akind;
 207 }
 208
 209 static bool function_types_equal(const function_type_t *type1,
 210                                  const function_type_t *type2)
 211 {
 212         if (type1->return_type != type2->return_type)
 213                 return false;
 214         if (type1->variadic != type2->variadic)
 215                 return false;
 216         if (type1->unspecified_parameters != type2->unspecified_parameters)
 217                 return false;
 218         if (type1->kr_style_parameters != type2->kr_style_parameters)
 219                 return false;
 220         if (type1->linkage != type2->linkage)
 221                 return false;
 222         if (type1->calling_convention != type2->calling_convention)
 223                 return false;
 224
 225         function_parameter_t *param1 = type1->parameters;
 226         function_parameter_t *param2 = type2->parameters;
 227         while (param1 != NULL && param2 != NULL) {
 228                 if (param1->type != param2->type)
 229                         return false;
 230                 param1 = param1->next;
 231                 param2 = param2->next;
 232         }
 233         if (param1 != NULL || param2 != NULL)
 234                 return false;
 235
 236         return true;
 237 }
 238
 239 static bool pointer_types_equal(const pointer_type_t *type1,
 240                                 const pointer_type_t *type2)
 241 {
 242         return type1->points_to     == type2->points_to &&
 243                type1->base_variable == type2->base_variable;
 244 }
 245
 246 static bool reference_types_equal(const reference_type_t *type1,
 247                                   const reference_type_t *type2)
 248 {
 249         return type1->refers_to == type2->refers_to;
 250 }
 251
 252 static bool array_types_equal(const array_type_t *type1,
 253                               const array_type_t *type2)
 254 {
 255         if (type1->element_type != type2->element_type)
 256                 return false;
 257         if (type1->is_variable != type2->is_variable)
 258                 return false;
 259         if (type1->is_static != type2->is_static)
 260                 return false;
 261         if (type1->size_constant != type2->size_constant)
 262                 return false;
 263
 264         /* never identify vla types, because we need them for caching calculated
 265          * sizes later in ast2firm */
 266         if (type1->is_vla || type2->is_vla)
 267                 return false;
 268
 269         /* TODO: compare size expressions for equality... */
 270
 271         return false;
 272 }
 273
 274 static bool builtin_types_equal(const builtin_type_t *type1,
 275                                 const builtin_type_t *type2)
 276 {
 277         return type1->symbol == type2->symbol;
 278 }
 279
 280 static bool compound_types_equal(const compound_type_t *type1,
 281                                  const compound_type_t *type2)
 282 {
 283         return type1->compound == type2->compound;
 284 }
 285
 286 static bool enum_types_equal(const enum_type_t *type1,
 287                              const enum_type_t *type2)
 288 {
 289         return type1->enume == type2->enume;
 290 }
 291
 292 static bool typedef_types_equal(const typedef_type_t *type1,
 293                                 const typedef_type_t *type2)
 294 {
 295         return type1->typedefe == type2->typedefe;
 296 }
 297
 298 static bool typeof_types_equal(const typeof_type_t *type1,
 299                                const typeof_type_t *type2)
 300 {
 301         if (type1->expression != type2->expression)
 302                 return false;
 303         if (type1->typeof_type != type2->typeof_type)
 304                 return false;
 305
 306         return true;
 307 }
 308
 309 static bool bitfield_types_equal(const bitfield_type_t *type1,
 310                                  const bitfield_type_t *type2)
 311 {
 312         if (type1->base_type != type2->base_type)
 313                 return false;
 314         /* TODO: compare size expression */
 315         return false;
 316 }
 317
 318 static bool types_equal(const type_t *type1, const type_t *type2)
 319 {
 320         if (type1 == type2)
 321                 return true;
 322         if (type1->kind != type2->kind)
 323                 return false;
 324         if (type1->base.qualifiers != type2->base.qualifiers)
 325                 return false;
 326         if (type1->base.modifiers != type2->base.modifiers)
 327                 return false;
 328
 329         switch (type1->kind) {
 330         case TYPE_ERROR:
 331                 /* Hmm, the error type is never equal */
 332                 return false;
 333         case TYPE_INVALID:
 334                 return false;
 335         case TYPE_ATOMIC:
 336                 return atomic_types_equal(&type1->atomic, &type2->atomic);
 337         case TYPE_COMPLEX:
 338                 return complex_types_equal(&type1->complex, &type2->complex);
 339         case TYPE_IMAGINARY:
 340                 return imaginary_types_equal(&type1->imaginary, &type2->imaginary);
 341         case TYPE_ENUM:
 342                 return enum_types_equal(&type1->enumt, &type2->enumt);
 343         case TYPE_COMPOUND_STRUCT:
 344         case TYPE_COMPOUND_UNION:
 345                 return compound_types_equal(&type1->compound, &type2->compound);
 346         case TYPE_FUNCTION:
 347                 return function_types_equal(&type1->function, &type2->function);
 348         case TYPE_POINTER:
 349                 return pointer_types_equal(&type1->pointer, &type2->pointer);
 350         case TYPE_REFERENCE:
 351                 return reference_types_equal(&type1->reference, &type2->reference);
 352         case TYPE_ARRAY:
 353                 return array_types_equal(&type1->array, &type2->array);
 354         case TYPE_BUILTIN:
 355                 return builtin_types_equal(&type1->builtin, &type2->builtin);
 356         case TYPE_TYPEOF:
 357                 return typeof_types_equal(&type1->typeoft, &type2->typeoft);
 358         case TYPE_TYPEDEF:
 359                 return typedef_types_equal(&type1->typedeft, &type2->typedeft);
 360         case TYPE_BITFIELD:
 361                 return bitfield_types_equal(&type1->bitfield, &type2->bitfield);
 362         }
 363
 364         abort();
 365 }
 366
 367 #define HashSet                    type_hash_t
 368 #define HashSetIterator            type_hash_iterator_t
 369 #define ValueType                  type_t*
 370 #define NullValue                  NULL
 371 #define DeletedValue               ((type_t*)-1)
 372 #define Hash(this, key)            hash_type(key)
 373 #define KeysEqual(this,key1,key2)  types_equal(key1, key2)
 374 #define SetRangeEmpty(ptr,size)    memset(ptr, 0, (size) * sizeof(*(ptr)))
 375
 376 #define hashset_init             _typehash_init
 377 #define hashset_init_size        _typehash_init_size
 378 #define hashset_destroy          _typehash_destroy
 379 #define hashset_insert           _typehash_insert
 380 #define hashset_remove           typehash_remove
 381 #define hashset_find             typehash_find
 382 #define hashset_size             typehash_size
 383 #define hashset_iterator_init    typehash_iterator_init
 384 #define hashset_iterator_next    typehash_iterator_next
 385 #define hashset_remove_iterator  typehash_remove_iterator
 386 #define SCALAR_RETURN
 387
 388 #include "adt/hashset.c"
 389
 390 static type_hash_t typehash;
 391
 392 void init_typehash(void)
 393 {
 394         _typehash_init(&typehash);
 395 }
 396
 397 void exit_typehash(void)
 398 {
 399         _typehash_destroy(&typehash);
 400 }
 401
 402 type_t *typehash_insert(type_t *type)
 403 {
 404         return _typehash_insert(&typehash, type);
 405 }