mono/metadata/class.c

   1 /*
   2  * class.c: Class management for the Mono runtime
   3  *
   4  * Author:
   5  *   Miguel de Icaza (miguel@ximian.com)
   6  *
   7  * (C) 2001 Ximian, Inc.
   8  *
   9  * Possible Optimizations:
  10  *     in mono_class_create, do not allocate the class right away,
  11  *     but wait until you know the size of the FieldMap, so that
  12  *     the class embeds directly the FieldMap after the vtable.
  13  *
  14  *
  15  */
  16 #include <config.h>
  17 #include <glib.h>
  18 #include <stdio.h>
  19 #include <string.h>
  20 #include <stdlib.h>
  21 #include <signal.h>
  22 #include <mono/metadata/image.h>
  23 #include <mono/metadata/cil-coff.h>
  24 #include <mono/metadata/metadata.h>
  25 #include <mono/metadata/tabledefs.h>
  26 #include <mono/metadata/tokentype.h>
  27 #include <mono/metadata/class.h>
  28 #include <mono/metadata/object.h>
  29 #include <mono/metadata/appdomain.h>
  30 #include <mono/metadata/mono-endian.h>
  31
  32 #define CSIZE(x) (sizeof (x) / 4)
  33
  34 gboolean mono_print_vtable = FALSE;
  35
  36 static MonoClass * mono_class_create_from_typedef (MonoImage *image, guint32 type_token);
  37
  38 static gpointer
  39 default_trampoline (MonoMethod *method)
  40 {
  41         return method;
  42 }
  43
  44 static void
  45 default_runtime_class_init (MonoClass *klass)
  46 {
  47         return;
  48 }
  49
  50 static MonoTrampoline arch_create_jit_trampoline = default_trampoline;
  51 static MonoRuntimeClassInit mono_runtime_class_init = default_runtime_class_init;
  52
  53 void
  54 mono_install_trampoline (MonoTrampoline func)
  55 {
  56         arch_create_jit_trampoline = func? func: default_trampoline;
  57 }
  58
  59 void
  60 mono_install_runtime_class_init (MonoRuntimeClassInit func)
  61 {
  62         mono_runtime_class_init = func? func: default_runtime_class_init;
  63 }
  64
  65 static MonoClass *
  66 mono_class_create_from_typeref (MonoImage *image, guint32 type_token)
  67 {
  68         guint32 cols [MONO_TYPEREF_SIZE];
  69         MonoTableInfo  *t = &image->tables [MONO_TABLE_TYPEREF];
  70         guint32 idx;
  71         const char *name, *nspace;
  72         MonoClass *res;
  73
  74         mono_metadata_decode_row (t, (type_token&0xffffff)-1, cols, MONO_TYPEREF_SIZE);
  75         g_assert ((cols [MONO_TYPEREF_SCOPE] & 0x3) == 2);
  76         idx = cols [MONO_TYPEREF_SCOPE] >> 2;
  77
  78         if (!image->references ||  !image->references [idx-1]) {
  79                 /*
  80                  * detected a reference to mscorlib, we simply return a reference to a dummy
  81                  * until we have a better solution.
  82                  */
  83                 fprintf(stderr, "Sending dummy where %s.%s expected\n", mono_metadata_string_heap (image, cols [MONO_TYPEREF_NAMESPACE]), mono_metadata_string_heap (image, cols [MONO_TYPEREF_NAME]));
  84
  85                 res = mono_class_from_name (image, "System", "MonoDummy");
  86                 /* prevent method loading */
  87                 res->dummy = 1;
  88                 /* some storage if the type is used  - very ugly hack */
  89                 res->instance_size = 2*sizeof (gpointer);
  90                 return res;
  91         }
  92
  93         name = mono_metadata_string_heap (image, cols [MONO_TYPEREF_NAME]);
  94         nspace = mono_metadata_string_heap (image, cols [MONO_TYPEREF_NAMESPACE]);
  95
  96         /* load referenced assembly */
  97         image = image->references [idx-1]->image;
  98
  99         return mono_class_from_name (image, nspace, name);
 100 }
 101
 102 /**
 103  * class_compute_field_layout:
 104  * @m: pointer to the metadata.
 105  * @class: The class to initialize
 106  *
 107  * Initializes the class->fields.
 108  *
 109  * Currently we only support AUTO_LAYOUT, and do not even try to do
 110  * a good job at it.  This is temporary to get the code for Paolo.
 111  */
 112 static void
 113 class_compute_field_layout (MonoClass *class)
 114 {
 115         MonoImage *m = class->image;
 116         const int top = class->field.count;
 117         guint32 layout = class->flags & TYPE_ATTRIBUTE_LAYOUT_MASK;
 118         MonoTableInfo *t = &m->tables [MONO_TABLE_FIELD];
 119         int i;
 120
 121         /*
 122          * Fetch all the field information.
 123          */
 124         for (i = 0; i < top; i++){
 125                 const char *sig;
 126                 guint32 cols [MONO_FIELD_SIZE];
 127                 int idx = class->field.first + i;
 128
 129                 mono_metadata_decode_row (t, idx, cols, CSIZE (cols));
 130                 /* The name is needed for fieldrefs */
 131                 class->fields [i].name = mono_metadata_string_heap (m, cols [MONO_FIELD_NAME]);
 132                 sig = mono_metadata_blob_heap (m, cols [MONO_FIELD_SIGNATURE]);
 133                 mono_metadata_decode_value (sig, &sig);
 134                 /* FIELD signature == 0x06 */
 135                 g_assert (*sig == 0x06);
 136                 class->fields [i].type = mono_metadata_parse_field_type (
 137                         m, cols [MONO_FIELD_FLAGS], sig + 1, &sig);
 138                 if (cols [MONO_FIELD_FLAGS] & FIELD_ATTRIBUTE_HAS_FIELD_RVA) {
 139                         mono_metadata_field_info (m, idx, NULL, &class->fields [i].data, NULL);
 140                         if (!class->fields [i].data)
 141                                 g_warning ("field %s in %s should have RVA data, but hasn't", class->fields [i].name, class->name);
 142                 }
 143                 if (class->enumtype && !(cols [MONO_FIELD_FLAGS] & FIELD_ATTRIBUTE_STATIC)) {
 144                         class->enum_basetype = class->fields [i].type;
 145                         class->element_class = mono_class_from_mono_type (class->enum_basetype);
 146                 }
 147         }
 148         if (class->enumtype && !class->enum_basetype) {
 149                 if (!((strcmp (class->name, "Enum") == 0) && (strcmp (class->name_space, "System") == 0)))
 150                         G_BREAKPOINT ();
 151         }
 152         /*
 153          * Compute field layout and total size.
 154          */
 155         switch (layout){
 156         case TYPE_ATTRIBUTE_AUTO_LAYOUT:
 157         case TYPE_ATTRIBUTE_SEQUENTIAL_LAYOUT:
 158                 for (i = 0; i < top; i++){
 159                         int size, align;
 160
 161                         size = mono_type_size (class->fields [i].type, &align);
 162                         if (class->fields [i].type->attrs & FIELD_ATTRIBUTE_STATIC) {
 163                                 class->fields [i].offset = class->class_size;
 164                                 class->fields [i].offset += align - 1;
 165                                 class->fields [i].offset &= ~(align - 1);
 166                                 class->class_size = class->fields [i].offset + size;
 167                         } else {
 168                                 class->min_align = MAX (align, class->min_align);
 169                                 class->fields [i].offset = class->instance_size;
 170                                 class->fields [i].offset += align - 1;
 171                                 class->fields [i].offset &= ~(align - 1);
 172                                 class->instance_size = class->fields [i].offset + size;
 173                         }
 174                 }
 175                 if (class->instance_size & (class->min_align - 1)) {
 176                         class->instance_size += class->min_align - 1;
 177                         class->instance_size &= ~(class->min_align - 1);
 178                 }
 179                 break;
 180         case TYPE_ATTRIBUTE_EXPLICIT_LAYOUT:
 181                 for (i = 0; i < top; i++){
 182                         int size, align;
 183                         int idx = class->field.first + i;
 184
 185                         /*
 186                          * There must be info about all the fields in a type if it
 187                          * uses explicit layout.
 188                          */
 189
 190                         size = mono_type_size (class->fields [i].type, &align);
 191                         if (class->fields [i].type->attrs & FIELD_ATTRIBUTE_STATIC) {
 192                                 class->fields [i].offset = class->class_size;
 193                                 class->fields [i].offset += align - 1;
 194                                 class->fields [i].offset &= ~(align - 1);
 195                                 class->class_size = class->fields [i].offset + size;
 196                         } else {
 197                                 mono_metadata_field_info (m, idx, &class->fields [i].offset, NULL, NULL);
 198                                 if (class->fields [i].offset == (guint32)-1)
 199                                                 g_warning ("%s not initialized correctly (missing field layout info for %s)", class->name, class->fields [i].name);
 200                                 /*
 201                                  * The offset is from the start of the object: this works for both
 202                                  * classes and valuetypes.
 203                                  */
 204                                 class->fields [i].offset += sizeof (MonoObject);
 205                                 /*
 206                                  * Calc max size.
 207                                  */
 208                                 size += class->fields [i].offset;
 209                                 class->instance_size = MAX (class->instance_size, size);
 210                         }
 211                 }
 212                 break;
 213         }
 214 }
 215
 216 static void
 217 init_properties (MonoClass *class)
 218 {
 219         guint startm, endm, i, j;
 220         guint32 cols [MONO_PROPERTY_SIZE];
 221         MonoTableInfo *pt = &class->image->tables [MONO_TABLE_PROPERTY];
 222         MonoTableInfo *msemt = &class->image->tables [MONO_TABLE_METHODSEMANTICS];
 223
 224         class->property.first = mono_metadata_properties_from_typedef (class->image, mono_metadata_token_index (class->type_token) - 1, &class->property.last);
 225         class->property.count = class->property.last - class->property.first;
 226
 227         class->properties = g_new0 (MonoProperty, class->property.count);
 228         for (i = class->property.first; i < class->property.last; ++i) {
 229                 mono_metadata_decode_row (pt, i, cols, MONO_PROPERTY_SIZE);
 230                 class->properties [i - class->property.first].attrs = cols [MONO_PROPERTY_FLAGS];
 231                 class->properties [i - class->property.first].name = mono_metadata_string_heap (class->image, cols [MONO_PROPERTY_NAME]);
 232
 233                 startm = mono_metadata_methods_from_property (class->image, i, &endm);
 234                 for (j = startm; j < endm; ++j) {
 235                         mono_metadata_decode_row (msemt, j, cols, MONO_METHOD_SEMA_SIZE);
 236                         switch (cols [MONO_METHOD_SEMA_SEMANTICS]) {
 237                         case 1: /* set */
 238                                 class->properties [i - class->property.first].set = class->methods [cols [MONO_METHOD_SEMA_METHOD] - 1 - class->method.first];
 239                                 break;
 240                         case 2: /* get */
 241                                 class->properties [i - class->property.first].get = class->methods [cols [MONO_METHOD_SEMA_METHOD] - 1 - class->method.first];
 242                                 break;
 243                         default:
 244                                 break;
 245                         }
 246                 }
 247         }
 248 }
 249
 250 static guint
 251 mono_get_unique_iid (MonoClass *class)
 252 {
 253         static GHashTable *iid_hash = NULL;
 254         static guint iid = 0;
 255
 256         char *str;
 257         gpointer value;
 258
 259         g_assert (class->flags & TYPE_ATTRIBUTE_INTERFACE);
 260
 261         if (!iid_hash)
 262                 iid_hash = g_hash_table_new (g_str_hash, g_str_equal);
 263
 264         str = g_strdup_printf ("%s|%s.%s\n", class->image->name, class->name_space, class->name);
 265
 266         if (g_hash_table_lookup_extended (iid_hash, str, NULL, &value)) {
 267                 g_free (str);
 268                 return (guint)value;
 269         } else {
 270                 g_hash_table_insert (iid_hash, str, (gpointer)iid);
 271                 ++iid;
 272         }
 273
 274         g_free (str);
 275         return iid - 1;
 276 }
 277
 278 /**
 279  * mono_class_init:
 280  * @class: the class to initialize
 281  *
 282  * compute the instance_size, class_size and other infos that cannot be
 283  * computed at mono_class_get() time. Also compute a generic vtable and
 284  * the method slot numbers. We use this infos later to create a domain
 285  * specific vtable.
 286  */
 287 void
 288 mono_class_init (MonoClass *class)
 289 {
 290         MonoClass *k, *ic;
 291         MonoMethod **vtable = class->vtable;
 292         int i, max_iid, cur_slot = 0;
 293
 294         g_assert (class);
 295
 296         if (class->inited)
 297                 return;
 298         class->inited = 1;
 299
 300         if (class->parent) {
 301                 if (!class->parent->inited)
 302                         mono_class_init (class->parent);
 303                 class->instance_size += class->parent->instance_size;
 304                 class->class_size += class->parent->class_size;
 305                 class->min_align = class->parent->min_align;
 306                 cur_slot = class->parent->vtable_size;
 307         } else
 308                 class->min_align = 1;
 309
 310         /*
 311          * Computes the size used by the fields, and their locations
 312          */
 313         if (class->field.count > 0){
 314                 class->fields = g_new0 (MonoClassField, class->field.count);
 315                 class_compute_field_layout (class);
 316         }
 317
 318         /* initialize method pointers */
 319         class->methods = g_new (MonoMethod*, class->method.count);
 320         for (i = 0; i < class->method.count; ++i)
 321                 class->methods [i] = mono_get_method (class->image,
 322                         MONO_TOKEN_METHOD_DEF | (i + class->method.first + 1), class);
 323
 324         if (class->flags & TYPE_ATTRIBUTE_INTERFACE) {
 325                 for (i = 0; i < class->method.count; ++i)
 326                         class->methods [i]->slot = i;
 327                 return;
 328         }
 329
 330         //printf ("METAINIT %s.%s\n", class->name_space, class->name);
 331
 332         /* compute maximum number of slots and maximum interface id */
 333         max_iid = 0;
 334         for (k = class; k ; k = k->parent) {
 335                 for (i = 0; i < k->interface_count; i++) {
 336                         ic = k->interfaces [i];
 337
 338                         if (!ic->inited)
 339                                 mono_class_init (ic);
 340
 341                         if (max_iid < ic->interface_id)
 342                                 max_iid = ic->interface_id;
 343                 }
 344         }
 345
 346         class->max_interface_id = max_iid;
 347         /* compute vtable offset for interfaces */
 348         class->interface_offsets = g_malloc (sizeof (gpointer) * (max_iid + 1));
 349
 350         for (i = 0; i <= max_iid; i++)
 351                 class->interface_offsets [i] = -1;
 352
 353         for (i = 0; i < class->interface_count; i++) {
 354                 ic = class->interfaces [i];
 355                 class->interface_offsets [ic->interface_id] = cur_slot;
 356                 cur_slot += ic->method.count;
 357         }
 358
 359         for (k = class->parent; k ; k = k->parent) {
 360                 for (i = 0; i < k->interface_count; i++) {
 361                         ic = k->interfaces [i];
 362                         if (class->interface_offsets [ic->interface_id] == -1) {
 363                                 int io = k->interface_offsets [ic->interface_id];
 364
 365                                 g_assert (io >= 0);
 366                                 g_assert (io <= class->vtable_size);
 367
 368                                 class->interface_offsets [ic->interface_id] = io;
 369                         }
 370                 }
 371         }
 372
 373         if (class->parent && class->parent->vtable_size)
 374                 memcpy (class->vtable, class->parent->vtable,  sizeof (gpointer) * class->parent->vtable_size);
 375
 376         for (k = class; k ; k = k->parent) {
 377                 for (i = 0; i < k->interface_count; i++) {
 378                         int j, l, io;
 379
 380                         ic = k->interfaces [i];
 381                         io = k->interface_offsets [ic->interface_id];
 382
 383                         g_assert (io >= 0);
 384                         g_assert (io <= class->vtable_size);
 385
 386                         if (k == class) {
 387                                 for (l = 0; l < ic->method.count; l++) {
 388                                         MonoMethod *im = ic->methods [l];
 389                                         for (j = 0; j < class->method.count; ++j) {
 390                                                 MonoMethod *cm = class->methods [j];
 391                                                 if (!(cm->flags & METHOD_ATTRIBUTE_VIRTUAL) ||
 392                                                     !(cm->flags & METHOD_ATTRIBUTE_PUBLIC) ||
 393                                                     !(cm->flags & METHOD_ATTRIBUTE_NEW_SLOT))
 394                                                         continue;
 395                                                 if (!strcmp(cm->name, im->name) &&
 396                                                     mono_metadata_signature_equal (cm->signature, im->signature)) {
 397                                                         g_assert (io + l <= class->vtable_size);
 398                                                         vtable [io + l] = cm;
 399                                                 }
 400                                         }
 401                                 }
 402                         } else {
 403                                 /* already implemented */
 404                                 if (io >= k->vtable_size)
 405                                         continue;
 406                         }
 407
 408                         for (l = 0; l < ic->method.count; l++) {
 409                                 MonoMethod *im = ic->methods [l];
 410                                 MonoClass *k1;
 411
 412                                 g_assert (io + l <= class->vtable_size);
 413
 414                                 if (vtable [io + l])
 415                                         continue;
 416
 417                                 for (k1 = class; k1; k1 = k1->parent) {
 418                                         for (j = 0; j < k1->method.count; ++j) {
 419                                                 MonoMethod *cm = k1->methods [j];
 420
 421                                                 if (!(cm->flags & METHOD_ATTRIBUTE_VIRTUAL) ||
 422                                                     !(cm->flags & METHOD_ATTRIBUTE_PUBLIC))
 423                                                         continue;
 424
 425                                                 if (!strcmp(cm->name, im->name) &&
 426                                                     mono_metadata_signature_equal (cm->signature, im->signature)) {
 427                                                         g_assert (io + l <= class->vtable_size);
 428                                                         vtable [io + l] = cm;
 429                                                         break;
 430                                                 }
 431
 432                                         }
 433                                         g_assert (io + l <= class->vtable_size);
 434                                         if (vtable [io + l])
 435                                                 break;
 436                                 }
 437                         }
 438
 439                         for (l = 0; l < ic->method.count; l++) {
 440                                 MonoMethod *im = ic->methods [l];
 441                                 char *qname;
 442                                 if (ic->name_space && ic->name_space [0])
 443                                         qname = g_strconcat (ic->name_space, ".", ic->name, ".", im->name, NULL);
 444                                 else
 445                                         qname = g_strconcat (ic->name, ".", im->name, NULL);
 446
 447                                 for (j = 0; j < class->method.count; ++j) {
 448                                         MonoMethod *cm = class->methods [j];
 449
 450                                         if (!(cm->flags & METHOD_ATTRIBUTE_VIRTUAL))
 451                                                 continue;
 452
 453                                         if (!strcmp (cm->name, qname) &&
 454                                             mono_metadata_signature_equal (cm->signature, im->signature)) {
 455                                                 g_assert (io + l <= class->vtable_size);
 456                                                 vtable [io + l] = cm;
 457                                                 break;
 458                                         }
 459                                 }
 460                                 g_free (qname);
 461                         }
 462
 463
 464                         if (!(class->flags & TYPE_ATTRIBUTE_ABSTRACT)) {
 465                                 for (l = 0; l < ic->method.count; l++) {
 466                                         MonoMethod *im = ic->methods [l];
 467                                         g_assert (io + l <= class->vtable_size);
 468                                         if (!(vtable [io + l])) {
 469                                                 printf ("no implementation for interface method %s.%s::%s in class %s.%s\n",
 470                                                         ic->name_space, ic->name, im->name, class->name_space, class->name);
 471
 472                                                 for (j = 0; j < class->method.count; ++j) {
 473                                                         MonoMethod *cm = class->methods [j];
 474
 475                                                         printf ("METHOD %s\n", cm->name);
 476                                                 }
 477                                                 g_assert_not_reached ();
 478                                         }
 479                                 }
 480                         }
 481
 482                         for (l = 0; l < ic->method.count; l++) {
 483                                 MonoMethod *im = vtable [io + l];
 484
 485                                 if (im) {
 486                                         g_assert (io + l <= class->vtable_size);
 487                                         if (im->slot < 0) {
 488                                                 // fixme: why do we need this ?
 489                                                 im->slot = io + l;
 490                                                 // g_assert_not_reached ();
 491                                         }
 492                                 }
 493                         }
 494                 }
 495         }
 496
 497         for (i = 0; i < class->method.count; ++i) {
 498                 MonoMethod *cm;
 499
 500                 cm = class->methods [i];
 501
 502                 if (!(cm->flags & METHOD_ATTRIBUTE_VIRTUAL) ||
 503                     (cm->slot >= 0))
 504                         continue;
 505
 506                 if (!(cm->flags & METHOD_ATTRIBUTE_NEW_SLOT)) {
 507                         for (k = class->parent; k ; k = k->parent) {
 508                                 int j;
 509                                 for (j = 0; j < k->method.count; ++j) {
 510                                         MonoMethod *m1 = k->methods [j];
 511                                         if (!(m1->flags & METHOD_ATTRIBUTE_VIRTUAL))
 512                                                 continue;
 513                                         if (!strcmp(cm->name, m1->name) &&
 514                                             mono_metadata_signature_equal (cm->signature, m1->signature)) {
 515                                                 cm->slot = k->methods [j]->slot;
 516                                                 g_assert (cm->slot < class->vtable_size);
 517                                                 break;
 518                                         }
 519                                 }
 520                                 if (cm->slot >= 0)
 521                                         break;
 522                         }
 523                 }
 524
 525                 if (cm->slot < 0)
 526                         cm->slot = cur_slot++;
 527
 528                 if (!(cm->flags & METHOD_ATTRIBUTE_ABSTRACT))
 529                         vtable [cm->slot] = cm;
 530         }
 531
 532         init_properties (class);
 533
 534         i = mono_metadata_nesting_typedef (class->image, class->type_token);
 535         while (i) {
 536                 MonoClass* nclass;
 537                 guint32 cols [MONO_NESTED_CLASS_SIZE];
 538                 mono_metadata_decode_row (&class->image->tables [MONO_TABLE_NESTEDCLASS], i - 1, cols, MONO_NESTED_CLASS_SIZE);
 539                 if (cols [MONO_NESTED_CLASS_ENCLOSING] != mono_metadata_token_index (class->type_token))
 540                         break;
 541                 nclass = mono_class_create_from_typedef (class->image, MONO_TOKEN_TYPE_DEF | cols [MONO_NESTED_CLASS_NESTED]);
 542                 class->nested_classes = g_list_prepend (class->nested_classes, nclass);
 543                 ++i;
 544         }
 545
 546         if (mono_print_vtable) {
 547                 int icount = 0;
 548
 549                 for (i = 0; i <= max_iid; i++)
 550                         if (class->interface_offsets [i] != -1)
 551                                 icount++;
 552
 553                 printf ("VTable %s.%s (size = %d, interfaces = %d)\n", class->name_space,
 554                         class->name, class->vtable_size, icount);
 555
 556                 for (i = 0; i < class->vtable_size; ++i) {
 557                         MonoMethod *cm;
 558
 559                         cm = vtable [i];
 560                         if (cm) {
 561                                 printf ("  slot %03d(%03d) %s.%s:%s\n", i, cm->slot,
 562                                         cm->klass->name_space, cm->klass->name,
 563                                         cm->name);
 564                         }
 565                 }
 566
 567
 568                 if (icount) {
 569                         printf ("Interfaces %s.%s (max_iid = %d)\n", class->name_space,
 570                                 class->name, max_iid);
 571
 572                         for (i = 0; i < class->interface_count; i++) {
 573                                 ic = class->interfaces [i];
 574                                 printf ("  slot %03d(%03d) %s.%s\n",
 575                                         class->interface_offsets [ic->interface_id],
 576                                         ic->method.count, ic->name_space, ic->name);
 577                         }
 578
 579                         for (k = class->parent; k ; k = k->parent) {
 580                                 for (i = 0; i < k->interface_count; i++) {
 581                                         ic = k->interfaces [i];
 582                                         printf ("  slot %03d(%03d) %s.%s\n",
 583                                                 class->interface_offsets [ic->interface_id],
 584                                                 ic->method.count, ic->name_space, ic->name);
 585                                 }
 586                         }
 587                 }
 588         }
 589 }
 590
 591 /**
 592  * mono_class_vtable:
 593  * @domain: the application domain
 594  * @class: the class to initialize
 595  *
 596  * VTables are domain specific because we create domain specific code, and
 597  * they contain the domain specific static class data.
 598  */
 599 MonoVTable *
 600 mono_class_vtable (MonoDomain *domain, MonoClass *class)
 601 {
 602         MonoClass *k;
 603         MonoVTable *vt;
 604         MonoClassField *field;
 605         guint32 cindex;
 606         guint32 cols [MONO_CONSTANT_SIZE];
 607         const char *p;
 608         char *t;
 609         int i;
 610
 611         g_assert (class);
 612
 613         /* can interfaces have static fields? */
 614         if (class->flags & TYPE_ATTRIBUTE_INTERFACE)
 615                 g_assert_not_reached ();
 616
 617         if ((vt = g_hash_table_lookup (domain->class_vtable_hash, class)))
 618                 return vt;
 619
 620         if (!class->inited)
 621                 mono_class_init (class);
 622
 623         vt = g_malloc0 (sizeof (MonoVTable) + class->vtable_size * sizeof (gpointer));
 624         vt->klass = class;
 625         vt->domain = domain;
 626
 627         if (class->class_size) {
 628                 vt->data = g_malloc0 (class->class_size + 8);
 629                 /* align: fixme not 64 bit clean */
 630                 if (((guint32)vt->data) & 0x7)
 631                         vt->data += 8 - (((guint32)vt->data) & 0x7);
 632         }
 633
 634         for (i = class->field.first; i < class->field.last; ++i) {
 635                 field = &class->fields [i - class->field.first];
 636                 if (!(field->type->attrs & FIELD_ATTRIBUTE_STATIC))
 637                         continue;
 638                 if (!(field->type->attrs & FIELD_ATTRIBUTE_HAS_DEFAULT))
 639                         continue;
 640                 cindex = mono_metadata_get_constant_index (class->image, MONO_TOKEN_FIELD_DEF | (i + 1));
 641                 if (!cindex) {
 642                         g_warning ("constant for field %s not found", field->name);
 643                         continue;
 644                 }
 645                 mono_metadata_decode_row (&class->image->tables [MONO_TABLE_CONSTANT], cindex - 1, cols, MONO_CONSTANT_SIZE);
 646                 p = mono_metadata_blob_heap (class->image, cols [MONO_CONSTANT_VALUE]);
 647                 mono_metadata_decode_blob_size (p, &p);
 648                 t = (char*)vt->data + field->offset;
 649                 /* should we check that the type matches? */
 650                 switch (cols [MONO_CONSTANT_TYPE]) {
 651                         case MONO_TYPE_BOOLEAN:
 652                 case MONO_TYPE_U1:
 653                 case MONO_TYPE_I1:
 654                         *t = *p;
 655                         break;
 656                 case MONO_TYPE_CHAR:
 657                 case MONO_TYPE_U2:
 658                 case MONO_TYPE_I2: {
 659                         guint16 *val = (guint16*)t;
 660                         *val = read16 (p);
 661                         break;
 662                 }
 663                 case MONO_TYPE_U4:
 664                 case MONO_TYPE_I4: {
 665                         guint32 *val = (guint32*)t;
 666                         *val = read32 (p);
 667                         break;
 668                 }
 669                 case MONO_TYPE_U8:
 670                 case MONO_TYPE_I8: {
 671                         guint64 *val = (guint64*)t;
 672                         *val = read64 (p);
 673                         break;
 674                 }
 675                 case MONO_TYPE_R4: {
 676                         float *val = (float*)t;
 677                         readr4 (p, val);
 678                         break;
 679                 }
 680                 case MONO_TYPE_R8: {
 681                         double *val = (double*)t;
 682                         readr8 (p, val);
 683                         break;
 684                 }
 685                 case MONO_TYPE_STRING: {
 686                         g_warning ("we don't handle strings in constant table");
 687                         break;
 688                 }
 689                 case MONO_TYPE_CLASS:
 690                         /* nothing to do, we malloc0 the data and the value can be 0 only */
 691                         break;
 692                 default:
 693                         g_warning ("type 0x%02x should not be in constant table", cols [MONO_CONSTANT_TYPE]);
 694                 }
 695         }
 696
 697         vt->interface_offsets = g_malloc0 (sizeof (gpointer) * (class->max_interface_id + 1));
 698
 699         /* initialize interface offsets */
 700         for (k = class; k ; k = k->parent) {
 701                 for (i = 0; i < k->interface_count; i++) {
 702                         int slot;
 703                         MonoClass *ic = k->interfaces [i];
 704                         slot = class->interface_offsets [ic->interface_id];
 705                         vt->interface_offsets [ic->interface_id] = &vt->vtable [slot];
 706                 }
 707         }
 708
 709         /* initialize vtable */
 710         for (i = 0; i < class->vtable_size; ++i) {
 711                 MonoMethod *cm;
 712
 713                 if ((cm = class->vtable [i]))
 714                         vt->vtable [i] = arch_create_jit_trampoline (cm);
 715         }
 716
 717         g_hash_table_insert (domain->class_vtable_hash, class, vt);
 718
 719         mono_runtime_class_init (class);
 720
 721         return vt;
 722 }
 723
 724 /*
 725  * Compute a relative numbering of the class hierarchy as described in
 726  * "Java for Large-Scale Scientific Computations?"
 727  */
 728 static void
 729 mono_compute_relative_numbering (MonoClass *class, int *c)
 730 {
 731         GList *s;
 732
 733         (*c)++;
 734
 735         class->baseval = *c;
 736
 737         for (s = class->subclasses; s; s = s->next)
 738                 mono_compute_relative_numbering ((MonoClass *)s->data, c);
 739
 740         class->diffval = *c -  class->baseval;
 741 }
 742
 743 /**
 744  * @image: context where the image is created
 745  * @type_token:  typedef token
 746  */
 747 static MonoClass *
 748 mono_class_create_from_typedef (MonoImage *image, guint32 type_token)
 749 {
 750         MonoTableInfo *tt = &image->tables [MONO_TABLE_TYPEDEF];
 751         MonoClass *class, *parent = NULL;
 752         guint32 cols [MONO_TYPEDEF_SIZE];
 753         guint32 cols_next [MONO_TYPEDEF_SIZE];
 754         guint tidx = mono_metadata_token_index (type_token);
 755         const char *name, *nspace;
 756         guint vtsize = 0, icount = 0;
 757         MonoClass **interfaces;
 758         int i;
 759
 760         if ((class = g_hash_table_lookup (image->class_cache, GUINT_TO_POINTER (type_token))))
 761                 return class;
 762
 763         g_assert (mono_metadata_token_table (type_token) == MONO_TABLE_TYPEDEF);
 764
 765         mono_metadata_decode_row (tt, tidx - 1, cols, CSIZE (cols));
 766
 767         if (tt->rows > tidx) {
 768                 mono_metadata_decode_row (tt, tidx, cols_next, CSIZE (cols_next));
 769                 vtsize += cols_next [MONO_TYPEDEF_METHOD_LIST] - cols [MONO_TYPEDEF_METHOD_LIST];
 770         } else {
 771                 vtsize += image->tables [MONO_TABLE_METHOD].rows - cols [MONO_TYPEDEF_METHOD_LIST] + 1;
 772         }
 773
 774         name = mono_metadata_string_heap (image, cols[1]);
 775         nspace = mono_metadata_string_heap (image, cols[2]);
 776
 777         if (!(!strcmp (nspace, "System") && !strcmp (name, "Object")) &&
 778             !(cols [0] & TYPE_ATTRIBUTE_INTERFACE)) {
 779                 parent = mono_class_get (image, mono_metadata_token_from_dor (cols [3]));
 780         }
 781         interfaces = mono_metadata_interfaces_from_typedef (image, type_token, &icount);
 782
 783         for (i = 0; i < icount; i++)
 784                 vtsize += interfaces [i]->method.count;
 785
 786         if (parent)
 787                 vtsize += parent->vtable_size;
 788
 789         if (cols [0] & TYPE_ATTRIBUTE_INTERFACE)
 790                 vtsize = 0;
 791
 792         class = g_malloc0 (sizeof (MonoClass) + vtsize * sizeof (gpointer));
 793
 794         g_hash_table_insert (image->class_cache, GUINT_TO_POINTER (type_token), class);
 795
 796         class->parent = parent;
 797         class->interfaces = interfaces;
 798         class->interface_count = icount;
 799         class->vtable_size = vtsize;
 800
 801         class->this_arg.byref = 1;
 802         class->this_arg.data.klass = class;
 803         class->this_arg.type = MONO_TYPE_CLASS;
 804         class->byval_arg.data.klass = class;
 805         class->byval_arg.type = MONO_TYPE_CLASS;
 806
 807         class->name = name;
 808         class->name_space = nspace;
 809
 810         class->image = image;
 811         class->type_token = type_token;
 812         class->flags = cols [0];
 813
 814         class->element_class = class;
 815
 816         /*g_print ("Init class %s\n", name);*/
 817
 818         /* if root of the hierarchy */
 819         if (!strcmp (nspace, "System") && !strcmp (name, "Object")) {
 820                 class->parent = NULL;
 821                 class->instance_size = sizeof (MonoObject);
 822         } else if (!(cols [0] & TYPE_ATTRIBUTE_INTERFACE)) {
 823                 int rnum = 0;
 824                 class->parent = mono_class_get (image,  mono_metadata_token_from_dor (cols [3]));
 825                 if (class->parent->enumtype || ((strcmp (class->parent->name, "ValueType") == 0) && (strcmp (class->parent->name_space, "System") == 0)))
 826                         class->valuetype = 1;
 827                 if (((strcmp (class->parent->name, "Enum") == 0) && (strcmp (class->parent->name_space, "System") == 0))) {
 828                         class->valuetype = class->enumtype = 1;
 829                 }
 830                 //class->enumtype = class->parent->enumtype;
 831                 class->parent->subclasses = g_list_prepend (class->parent->subclasses, class);
 832                 mono_compute_relative_numbering (mono_defaults.object_class, &rnum);
 833         }
 834
 835         if (!strcmp (nspace, "System")) {
 836                 if (!strcmp (name, "ValueType")) {
 837                         /*
 838                          * do not set the valuetype bit for System.ValueType.
 839                          * class->valuetype = 1;
 840                          */
 841                 } else if (!strcmp (name, "Enum")) {
 842                         /*
 843                          * do not set the valuetype bit for System.Enum.
 844                          * class->valuetype = 1;
 845                          */
 846                         class->valuetype = 0;
 847                         class->enumtype = 0;
 848                 } else if (!strcmp (name, "Object")) {
 849                         class->this_arg.type = class->byval_arg.type = MONO_TYPE_OBJECT;
 850                 } else if (!strcmp (name, "String")) {
 851                         class->this_arg.type = class->byval_arg.type = MONO_TYPE_STRING;
 852                 }
 853         }
 854
 855         if (class->valuetype) {
 856                 int t = MONO_TYPE_VALUETYPE;
 857                 if (!strcmp (nspace, "System")) {
 858                         switch (*name) {
 859                         case 'B':
 860                                 if (!strcmp (name, "Boolean")) {
 861                                         t = MONO_TYPE_BOOLEAN;
 862                                 } else if (!strcmp(name, "Byte")) {
 863                                         t = MONO_TYPE_U1;
 864                                 }
 865                                 break;
 866                         case 'C':
 867                                 if (!strcmp (name, "Char")) {
 868                                         t = MONO_TYPE_CHAR;
 869                                 }
 870                                 break;
 871                         case 'D':
 872                                 if (!strcmp (name, "Double")) {
 873                                         t = MONO_TYPE_R8;
 874                                 }
 875                                 break;
 876                         case 'I':
 877                                 if (!strcmp (name, "Int32")) {
 878                                         t = MONO_TYPE_I4;
 879                                 } else if (!strcmp(name, "Int16")) {
 880                                         t = MONO_TYPE_I2;
 881                                 } else if (!strcmp(name, "Int64")) {
 882                                         t = MONO_TYPE_I8;
 883                                 } else if (!strcmp(name, "IntPtr")) {
 884                                         t = MONO_TYPE_I;
 885                                 }
 886                                 break;
 887                         case 'S':
 888                                 if (!strcmp (name, "Single")) {
 889                                         t = MONO_TYPE_R4;
 890                                 } else if (!strcmp(name, "SByte")) {
 891                                         t = MONO_TYPE_I1;
 892                                 }
 893                                 break;
 894                         case 'U':
 895                                 if (!strcmp (name, "UInt32")) {
 896                                         t = MONO_TYPE_U4;
 897                                 } else if (!strcmp(name, "UInt16")) {
 898                                         t = MONO_TYPE_U2;
 899                                 } else if (!strcmp(name, "UInt64")) {
 900                                         t = MONO_TYPE_U8;
 901                                 } else if (!strcmp(name, "UIntPtr")) {
 902                                         t = MONO_TYPE_U;
 903                                 }
 904                                 break;
 905                         case 'V':
 906                                 if (!strcmp (name, "Void")) {
 907                                         t = MONO_TYPE_VOID;
 908                                 }
 909                                 break;
 910                         default:
 911                                 break;
 912                         }
 913                 }
 914                 class->this_arg.type = class->byval_arg.type = t;
 915         }
 916
 917         /*
 918          * Compute the field and method lists
 919          */
 920         class->field.first  = cols [MONO_TYPEDEF_FIELD_LIST] - 1;
 921         class->method.first = cols [MONO_TYPEDEF_METHOD_LIST] - 1;
 922
 923         if (tt->rows > tidx){
 924                 mono_metadata_decode_row (tt, tidx, cols_next, CSIZE (cols_next));
 925                 class->field.last  = cols_next [MONO_TYPEDEF_FIELD_LIST] - 1;
 926                 class->method.last = cols_next [MONO_TYPEDEF_METHOD_LIST] - 1;
 927         } else {
 928                 class->field.last  = image->tables [MONO_TABLE_FIELD].rows;
 929                 class->method.last = image->tables [MONO_TABLE_METHOD].rows;
 930         }
 931
 932         if (cols [MONO_TYPEDEF_FIELD_LIST] &&
 933             cols [MONO_TYPEDEF_FIELD_LIST] <= image->tables [MONO_TABLE_FIELD].rows)
 934                 class->field.count = class->field.last - class->field.first;
 935         else
 936                 class->field.count = 0;
 937
 938         if (cols [MONO_TYPEDEF_METHOD_LIST] <= image->tables [MONO_TABLE_METHOD].rows)
 939                 class->method.count = class->method.last - class->method.first;
 940         else
 941                 class->method.count = 0;
 942
 943         /* reserve space to store vector pointer in arrays */
 944         if (!strcmp (nspace, "System") && !strcmp (name, "Array")) {
 945                 class->instance_size += 2 * sizeof (gpointer);
 946                 g_assert (class->field.count == 0);
 947         }
 948
 949         if (class->flags & TYPE_ATTRIBUTE_INTERFACE)
 950                 class->interface_id = mono_get_unique_iid (class);
 951
 952         //class->interfaces = mono_metadata_interfaces_from_typedef (image, type_token, &class->interface_count);
 953
 954         if (class->enumtype)
 955                 mono_class_init (class);
 956
 957         if ((type_token = mono_metadata_nested_in_typedef (image, type_token)))
 958                 class->nested_in = mono_class_create_from_typedef (image, type_token);
 959         return class;
 960 }
 961
 962 static MonoClass *
 963 mono_create_ptr_class (MonoType *type)
 964 {
 965         MonoClass *result;
 966         MonoClass *el_class;
 967         static GHashTable *ptr_hash = NULL;
 968
 969         if (!ptr_hash)
 970                 ptr_hash = g_hash_table_new (g_direct_hash, g_direct_equal);
 971         el_class = mono_class_from_mono_type (type);
 972         if ((result = g_hash_table_lookup (ptr_hash, el_class)))
 973                 return result;
 974         result = g_new0 (MonoClass, 1);
 975
 976         result->parent = NULL; /* no parent for PTR types */
 977         result->name = "System";
 978         result->name_space = "MonoPtrFakeClass";
 979         result->image = NULL;
 980         result->inited = TRUE;
 981         /* Can pointers get boxed? */
 982         result->instance_size = sizeof (gpointer);
 983         /*
 984          * baseval, diffval: need them to allow casting ?
 985          */
 986         result->element_class = el_class;
 987         result->enum_basetype = &result->element_class->byval_arg;
 988
 989         result->this_arg.type = result->byval_arg.type = MONO_TYPE_PTR;
 990         result->this_arg.data.type = result->byval_arg.data.type = result->enum_basetype;
 991         result->this_arg.byref = TRUE;
 992
 993         g_hash_table_insert (ptr_hash, el_class, result);
 994
 995         return result;
 996 }
 997
 998 MonoClass *
 999 mono_class_from_mono_type (MonoType *type)
1000 {
1001         switch (type->type) {
1002         case MONO_TYPE_OBJECT:
1003                 return mono_defaults.object_class;
1004         case MONO_TYPE_VOID:
1005                 return mono_defaults.void_class;
1006         case MONO_TYPE_BOOLEAN:
1007                 return mono_defaults.boolean_class;
1008         case MONO_TYPE_CHAR:
1009                 return mono_defaults.char_class;
1010         case MONO_TYPE_I1:
1011                 return mono_defaults.sbyte_class;
1012         case MONO_TYPE_U1:
1013                 return mono_defaults.byte_class;
1014         case MONO_TYPE_I2:
1015                 return mono_defaults.int16_class;
1016         case MONO_TYPE_U2:
1017                 return mono_defaults.uint16_class;
1018         case MONO_TYPE_I4:
1019                 return mono_defaults.int32_class;
1020         case MONO_TYPE_U4:
1021                 return mono_defaults.uint32_class;
1022         case MONO_TYPE_I:
1023                 return mono_defaults.int_class;
1024         case MONO_TYPE_U:
1025                 return mono_defaults.uint_class;
1026         case MONO_TYPE_I8:
1027                 return mono_defaults.int64_class;
1028         case MONO_TYPE_U8:
1029                 return mono_defaults.uint64_class;
1030         case MONO_TYPE_R4:
1031                 return mono_defaults.single_class;
1032         case MONO_TYPE_R8:
1033                 return mono_defaults.double_class;
1034         case MONO_TYPE_STRING:
1035                 return mono_defaults.string_class;
1036         case MONO_TYPE_ARRAY:
1037                 return mono_array_class_get (mono_class_from_mono_type (type->data.array->type), type->data.array->rank);
1038         case MONO_TYPE_PTR:
1039                 return mono_create_ptr_class (type->data.type);
1040         case MONO_TYPE_SZARRAY:
1041                 return mono_array_class_get (mono_class_from_mono_type (type->data.type), 1);
1042         case MONO_TYPE_CLASS:
1043         case MONO_TYPE_VALUETYPE:
1044                 return type->data.klass;
1045         default:
1046                 g_warning ("implement me %02x\n", type->type);
1047                 g_assert_not_reached ();
1048         }
1049
1050         return NULL;
1051 }
1052
1053 /**
1054  * @image: context where the image is created
1055  * @type_spec:  typespec token
1056  */
1057 static MonoClass *
1058 mono_class_create_from_typespec (MonoImage *image, guint32 type_spec)
1059 {
1060         MonoType *type;
1061         MonoClass *class, *eclass;
1062
1063         type = mono_type_create_from_typespec (image, type_spec);
1064
1065         switch (type->type) {
1066         case MONO_TYPE_ARRAY:
1067                 eclass = mono_class_from_mono_type (type->data.array->type);
1068                 class = mono_array_class_get (eclass, type->data.array->rank);
1069                 break;
1070         case MONO_TYPE_SZARRAY:
1071                 eclass = mono_class_from_mono_type (type->data.type);
1072                 class = mono_array_class_get (eclass, 1);
1073                 break;
1074         case MONO_TYPE_PTR:
1075                 class = mono_class_from_mono_type (type->data.type);
1076                 break;
1077         default:
1078                 g_warning ("implement me: %08x", type->type);
1079                 g_assert_not_reached ();
1080         }
1081
1082         mono_metadata_free_type (type);
1083
1084         return class;
1085 }
1086
1087 /**
1088  * mono_array_class_get:
1089  * @eclass: element type class
1090  * @rank: the dimension of the array class
1091  *
1092  * Returns: a class object describing the array with element type @etype and
1093  * dimension @rank.
1094  */
1095 MonoClass *
1096 mono_array_class_get (MonoClass *eclass, guint32 rank)
1097 {
1098         MonoImage *image;
1099         MonoClass *class;
1100         static MonoClass *parent = NULL;
1101         guint32 key;
1102         int rnum = 0;
1103
1104         g_assert (rank <= 255);
1105
1106         if (!parent)
1107                 parent = mono_defaults.array_class;
1108
1109         if (!parent->inited)
1110                 mono_class_init (parent);
1111
1112         image = eclass->image;
1113
1114         g_assert (!eclass->type_token ||
1115                   mono_metadata_token_table (eclass->type_token) == MONO_TABLE_TYPEDEF);
1116
1117         key = ((rank & 0xff) << 24) | (eclass->type_token & 0xffffff);
1118         if ((class = g_hash_table_lookup (image->array_cache, GUINT_TO_POINTER (key))))
1119                 return class;
1120
1121         class = g_malloc0 (sizeof (MonoClass) + parent->vtable_size * sizeof (gpointer));
1122
1123         class->image = image;
1124         class->name_space = "System";
1125         class->name = "Array";
1126         class->type_token = 0;
1127         class->flags = TYPE_ATTRIBUTE_CLASS;
1128         class->parent = parent;
1129         class->instance_size = mono_class_instance_size (class->parent);
1130         class->class_size = 0;
1131         class->vtable_size = parent->vtable_size;
1132         class->parent->subclasses = g_list_prepend (class->parent->subclasses, class);
1133         mono_compute_relative_numbering (mono_defaults.object_class, &rnum);
1134
1135         class->rank = rank;
1136         class->element_class = eclass;
1137         if (rank > 1) {
1138                 class->byval_arg.type = MONO_TYPE_ARRAY;
1139                 /* FIXME: complete.... */
1140         } else {
1141                 class->byval_arg.type = MONO_TYPE_SZARRAY;
1142                 class->byval_arg.data.type = &eclass->byval_arg;
1143         }
1144         class->this_arg = class->byval_arg;
1145         class->this_arg.byref = 1;
1146
1147         g_hash_table_insert (image->array_cache, GUINT_TO_POINTER (key), class);
1148         return class;
1149 }
1150
1151 /**
1152  * mono_class_instance_size:
1153  * @klass: a class
1154  *
1155  * Returns: the size of an object instance
1156  */
1157 gint32
1158 mono_class_instance_size (MonoClass *klass)
1159 {
1160
1161         if (!klass->inited)
1162                 mono_class_init (klass);
1163
1164         return klass->instance_size;
1165 }
1166
1167 /**
1168  * mono_class_value_size:
1169  * @klass: a class
1170  *
1171  * This function is used for value types, and return the
1172  * space and the alignment to store that kind of value object.
1173  *
1174  * Returns: the size of a value of kind @klass
1175  */
1176 gint32
1177 mono_class_value_size      (MonoClass *klass, guint32 *align)
1178 {
1179         gint32 size;
1180
1181         /* fixme: check disable, because we still have external revereces to
1182          * mscorlib and Dummy Objects
1183          */
1184         /*g_assert (klass->valuetype);*/
1185
1186         size = mono_class_instance_size (klass) - sizeof (MonoObject);
1187
1188         if (align)
1189                 *align = klass->min_align;
1190
1191         return size;
1192 }
1193
1194 /**
1195  * mono_class_data_size:
1196  * @klass: a class
1197  *
1198  * Returns: the size of the static class data
1199  */
1200 gint32
1201 mono_class_data_size (MonoClass *klass)
1202 {
1203
1204         if (!klass->inited)
1205                 mono_class_init (klass);
1206
1207         return klass->class_size;
1208 }
1209
1210 /*
1211  * Auxiliary routine to mono_class_get_field
1212  *
1213  * Takes a field index instead of a field token.
1214  */
1215 static MonoClassField *
1216 mono_class_get_field_idx (MonoClass *class, int idx)
1217 {
1218         if (class->field.count){
1219                 if ((idx >= class->field.first) && (idx < class->field.last)){
1220                         return &class->fields [idx - class->field.first];
1221                 }
1222         }
1223
1224         if (!class->parent)
1225                 return NULL;
1226
1227         return mono_class_get_field_idx (class->parent, idx);
1228 }
1229
1230 /**
1231  * mono_class_get_field:
1232  * @class: the class to lookup the field.
1233  * @field_token: the field token
1234  *
1235  * Returns: A MonoClassField representing the type and offset of
1236  * the field, or a NULL value if the field does not belong to this
1237  * class.
1238  */
1239 MonoClassField *
1240 mono_class_get_field (MonoClass *class, guint32 field_token)
1241 {
1242         int idx = mono_metadata_token_index (field_token);
1243
1244         g_assert (mono_metadata_token_code (field_token) == MONO_TOKEN_FIELD_DEF);
1245
1246         return mono_class_get_field_idx (class, idx - 1);
1247 }
1248
1249 MonoClassField *
1250 mono_class_get_field_from_name (MonoClass *klass, const char *name)
1251 {
1252         int i;
1253         guint32 token;
1254         MonoTableInfo *t = &klass->image->tables [MONO_TABLE_FIELD];
1255
1256         for (i = 0; i < klass->field.count; ++i) {
1257                 token = mono_metadata_decode_row_col (t, klass->field.first + i, MONO_FIELD_NAME);
1258                 if (strcmp (name, mono_metadata_string_heap (klass->image, token)) == 0)
1259                         return &klass->fields [i];
1260         }
1261         return NULL;
1262 }
1263
1264 /**
1265  * mono_class_get:
1266  * @image: the image where the class resides
1267  * @type_token: the token for the class
1268  * @at: an optional pointer to return the array element type
1269  *
1270  * Returns: the MonoClass that represents @type_token in @image
1271  */
1272 MonoClass *
1273 mono_class_get (MonoImage *image, guint32 type_token)
1274 {
1275         MonoClass *class;
1276
1277         switch (type_token & 0xff000000){
1278         case MONO_TOKEN_TYPE_DEF:
1279                 class = mono_class_create_from_typedef (image, type_token);
1280                 break;
1281         case MONO_TOKEN_TYPE_REF:
1282                 return mono_class_create_from_typeref (image, type_token);
1283         case MONO_TOKEN_TYPE_SPEC:
1284                 class = mono_class_create_from_typespec (image, type_token);
1285                 break;
1286         default:
1287                 g_warning ("unknown token type %x", type_token & 0xff000000);
1288                 g_assert_not_reached ();
1289         }
1290
1291         return class;
1292 }
1293
1294 MonoClass *
1295 mono_class_from_name (MonoImage *image, const char* name_space, const char *name)
1296 {
1297         GHashTable *nspace_table;
1298         guint32 token;
1299
1300         nspace_table = g_hash_table_lookup (image->name_cache, name_space);
1301         if (!nspace_table)
1302                 return 0;
1303         token = GPOINTER_TO_UINT (g_hash_table_lookup (nspace_table, name));
1304
1305         if (!token) {
1306                 /*g_warning ("token not found for %s.%s in image %s", name_space, name, image->name);*/
1307                 return NULL;
1308         }
1309
1310         token = MONO_TOKEN_TYPE_DEF | token;
1311
1312         return mono_class_get (image, token);
1313 }
1314
1315 /**
1316  * mono_array_element_size:
1317  * @ac: pointer to a #MonoArrayClass
1318  *
1319  * Returns: the size of single array element.
1320  */
1321 gint32
1322 mono_array_element_size (MonoClass *ac)
1323 {
1324         if (ac->element_class->valuetype)
1325                 return mono_class_instance_size (ac->element_class) - sizeof (MonoObject);
1326         else
1327                 return sizeof (gpointer);
1328 }
1329
1330 gpointer
1331 mono_ldtoken (MonoImage *image, guint32 token, MonoClass **handle_class)
1332 {
1333         switch (token & 0xff000000) {
1334         case MONO_TOKEN_TYPE_DEF:
1335         case MONO_TOKEN_TYPE_REF: {
1336                 MonoClass *class;
1337                 if (handle_class)
1338                         *handle_class = mono_defaults.typehandle_class;
1339                 class = mono_class_get (image, token);
1340                 mono_class_init (class);
1341                 /* We return a MonoType* as handle */
1342                 return &class->byval_arg;
1343         }
1344         case MONO_TOKEN_TYPE_SPEC: {
1345                 MonoClass *class;
1346                 if (handle_class)
1347                         *handle_class = mono_defaults.typehandle_class;
1348                 class = mono_class_create_from_typespec (image, token);
1349                 mono_class_init (class);
1350                 return &class->byval_arg;
1351         }
1352         case MONO_TOKEN_FIELD_DEF: {
1353                 MonoClass *class;
1354                 guint32 type = mono_metadata_typedef_from_field (image, mono_metadata_token_index (token));
1355                 class = mono_class_get (image, MONO_TOKEN_TYPE_DEF | type);
1356                 mono_class_init (class);
1357                 if (handle_class)
1358                                 *handle_class = mono_class_from_name (mono_defaults.corlib, "System", "RuntimeFieldHandle");
1359                 return mono_class_get_field (class, token);
1360         }
1361         case MONO_TOKEN_METHOD_DEF:
1362         case MONO_TOKEN_MEMBER_REF:
1363         default:
1364                 g_warning ("Unknown token 0x%08x in ldtoken", token);
1365                 break;
1366         }
1367         return NULL;
1368 }
1369