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 #include <mono/metadata/debug-helpers.h>
  32 #include <mono/os/gc_wrapper.h>
  33
  34 #define CSIZE(x) (sizeof (x) / 4)
  35
  36 MonoStats mono_stats;
  37
  38 gboolean mono_print_vtable = FALSE;
  39
  40 static MonoClass * mono_class_create_from_typedef (MonoImage *image, guint32 type_token);
  41
  42 void (*mono_debugger_class_init_func) (MonoClass *klass) = NULL;
  43
  44 MonoClass *
  45 mono_class_from_typeref (MonoImage *image, guint32 type_token)
  46 {
  47         guint32 cols [MONO_TYPEREF_SIZE];
  48         MonoTableInfo  *t = &image->tables [MONO_TABLE_TYPEREF];
  49         guint32 idx;
  50         const char *name, *nspace;
  51         MonoClass *res;
  52
  53         mono_metadata_decode_row (t, (type_token&0xffffff)-1, cols, MONO_TYPEREF_SIZE);
  54
  55         name = mono_metadata_string_heap (image, cols [MONO_TYPEREF_NAME]);
  56         nspace = mono_metadata_string_heap (image, cols [MONO_TYPEREF_NAMESPACE]);
  57
  58         idx = cols [MONO_TYPEREF_SCOPE] >> RESOLTION_SCOPE_BITS;
  59         switch (cols [MONO_TYPEREF_SCOPE] & RESOLTION_SCOPE_MASK) {
  60         case RESOLTION_SCOPE_MODULE:
  61                 if (!idx)
  62                         g_error ("null ResolutionScope not yet handled");
  63                 /* a typedef in disguise */
  64                 return mono_class_from_name (image, nspace, name);
  65         case RESOLTION_SCOPE_MODULEREF:
  66                 return mono_class_from_name (image->assembly->modules [idx - 1], nspace, name);
  67         case RESOLTION_SCOPE_TYPEREF: {
  68                 MonoClass *enclosing = mono_class_from_typeref (image, MONO_TOKEN_TYPE_REF | idx);
  69                 GList *tmp;
  70                 mono_class_init (enclosing);
  71                 for (tmp = enclosing->nested_classes; tmp; tmp = tmp->next) {
  72                         res = tmp->data;
  73                         if (strcmp (res->name, name) == 0)
  74                                 return res;
  75                 }
  76                 g_warning ("TypeRef ResolutionScope not yet handled (%d)", idx);
  77                 return NULL;
  78         }
  79         case RESOLTION_SCOPE_ASSEMBLYREF:
  80                 break;
  81         }
  82
  83         if (!image->references ||  !image->references [idx-1]) {
  84                 /*
  85                  * detected a reference to mscorlib, we simply return a reference to a dummy
  86                  * until we have a better solution.
  87                  */
  88                 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]));
  89
  90                 res = mono_class_from_name (image, "System", "MonoDummy");
  91                 /* prevent method loading */
  92                 res->dummy = 1;
  93                 /* some storage if the type is used  - very ugly hack */
  94                 res->instance_size = 2*sizeof (gpointer);
  95                 return res;
  96         }
  97
  98         /* load referenced assembly */
  99         image = image->references [idx-1]->image;
 100
 101         return mono_class_from_name (image, nspace, name);
 102 }
 103
 104 MonoMarshalType *
 105 mono_marshal_load_type_info (MonoClass* klass)
 106 {
 107         int i, j, count = 0;
 108         MonoMarshalType *info;
 109         guint32 layout;
 110
 111         g_assert (klass != NULL);
 112
 113         if (klass->marshal_info)
 114                 return klass->marshal_info;
 115
 116         if (!klass->inited)
 117                 mono_class_init (klass);
 118
 119         for (i = 0; i < klass->field.count; ++i) {
 120                 if (klass->fields [i].type->attrs & FIELD_ATTRIBUTE_STATIC)
 121                         continue;
 122                 count++;
 123         }
 124
 125         layout = klass->flags & TYPE_ATTRIBUTE_LAYOUT_MASK;
 126
 127         klass->marshal_info = info = g_malloc0 (sizeof (MonoMarshalType) + sizeof (MonoMarshalField) * count);
 128         info->num_fields = count;
 129
 130         if (klass->parent)
 131                 info->native_size = mono_class_native_size (klass->parent, NULL);
 132
 133         for (j = i = 0; i < klass->field.count; ++i) {
 134                 int size, align;
 135
 136                 if (klass->fields [i].type->attrs & FIELD_ATTRIBUTE_STATIC)
 137                         continue;
 138
 139                 if (klass->fields [i].type->attrs & FIELD_ATTRIBUTE_HAS_FIELD_MARSHAL)
 140                         mono_metadata_field_info (klass->image, klass->field.first + i,
 141                                                   NULL, NULL, &info->fields [j].mspec);
 142
 143                 info->fields [j].field = &klass->fields [i];
 144
 145                 switch (layout) {
 146                 case TYPE_ATTRIBUTE_AUTO_LAYOUT:
 147                 case TYPE_ATTRIBUTE_SEQUENTIAL_LAYOUT:
 148                         size = mono_marshal_type_size (klass->fields [i].type, info->fields [j].mspec,
 149                                                        &align, TRUE, klass->unicode);
 150                         align = klass->packing_size ? MIN (klass->packing_size, align): align;
 151                         info->fields [j].offset = info->native_size;
 152                         info->fields [j].offset += align - 1;
 153                         info->fields [j].offset &= ~(align - 1);
 154                         info->native_size = info->fields [j].offset + size;
 155                         break;
 156                 case TYPE_ATTRIBUTE_EXPLICIT_LAYOUT:
 157                         /* FIXME: */
 158                         info->fields [j].offset = klass->fields [i].offset - sizeof (MonoObject);
 159                         info->native_size = klass->instance_size - sizeof (MonoObject);
 160                         break;
 161                 }
 162                 j++;
 163         }
 164
 165         if (info->native_size & (klass->min_align - 1)) {
 166                 info->native_size += klass->min_align - 1;
 167                 info->native_size &= ~(klass->min_align - 1);
 168         }
 169
 170         return klass->marshal_info;
 171 }
 172
 173 /**
 174  * class_compute_field_layout:
 175  * @m: pointer to the metadata.
 176  * @class: The class to initialize
 177  *
 178  * Initializes the class->fields.
 179  *
 180  * Currently we only support AUTO_LAYOUT, and do not even try to do
 181  * a good job at it.  This is temporary to get the code for Paolo.
 182  */
 183 static void
 184 class_compute_field_layout (MonoClass *class)
 185 {
 186         MonoImage *m = class->image;
 187         const int top = class->field.count;
 188         guint32 layout = class->flags & TYPE_ATTRIBUTE_LAYOUT_MASK;
 189         MonoTableInfo *t = &m->tables [MONO_TABLE_FIELD];
 190         int i, blittable = TRUE;
 191         guint32 rva;
 192         guint32 packing_size = 0;
 193
 194         if (class->size_inited)
 195                 return;
 196
 197         if (class->parent) {
 198                 if (!class->parent->size_inited)
 199                         class_compute_field_layout (class->parent);
 200                 class->instance_size += class->parent->instance_size;
 201                 class->class_size += class->parent->class_size;
 202                 class->min_align = class->parent->min_align;
 203         } else {
 204                 class->instance_size = sizeof (MonoObject);
 205                 class->min_align = 1;
 206         }
 207
 208         if (mono_metadata_packing_from_typedef (class->image, class->type_token, &packing_size, &class->instance_size)) {
 209                 class->instance_size += sizeof (MonoObject);
 210         }
 211
 212         g_assert ((packing_size & 0xfffffff0) == 0);
 213         class->packing_size = packing_size;
 214
 215         if (!top) {
 216                 class->size_inited = 1;
 217                 return;
 218         }
 219
 220         class->fields = g_new0 (MonoClassField, top);
 221
 222         /*
 223          * Fetch all the field information.
 224          */
 225         for (i = 0; i < top; i++){
 226                 const char *sig;
 227                 guint32 cols [MONO_FIELD_SIZE];
 228                 int idx = class->field.first + i;
 229
 230                 mono_metadata_decode_row (t, idx, cols, CSIZE (cols));
 231                 /* The name is needed for fieldrefs */
 232                 class->fields [i].name = mono_metadata_string_heap (m, cols [MONO_FIELD_NAME]);
 233                 sig = mono_metadata_blob_heap (m, cols [MONO_FIELD_SIGNATURE]);
 234                 mono_metadata_decode_value (sig, &sig);
 235                 /* FIELD signature == 0x06 */
 236                 g_assert (*sig == 0x06);
 237                 class->fields [i].type = mono_metadata_parse_field_type (
 238                         m, cols [MONO_FIELD_FLAGS], sig + 1, &sig);
 239
 240                 if (!(class->fields [i].type->attrs & FIELD_ATTRIBUTE_STATIC)) {
 241                         if (class->fields [i].type->byref) {
 242                                 blittable = FALSE;
 243                         } else {
 244                                 MonoClass *field_class = mono_class_from_mono_type (class->fields [i].type);
 245                                 if (!field_class->blittable)
 246                                         blittable = FALSE;
 247                         }
 248                 }
 249                 if (layout == TYPE_ATTRIBUTE_EXPLICIT_LAYOUT) {
 250                         mono_metadata_field_info (m, idx, &class->fields [i].offset, NULL, NULL);
 251                         if (class->fields [i].offset == (guint32)-1)
 252                                 g_warning ("%s not initialized correctly (missing field layout info for %s)", class->name, class->fields [i].name);
 253                 }
 254
 255                 if (cols [MONO_FIELD_FLAGS] & FIELD_ATTRIBUTE_HAS_FIELD_RVA) {
 256                         mono_metadata_field_info (m, idx, NULL, &rva, NULL);
 257                         if (!rva)
 258                                 g_warning ("field %s in %s should have RVA data, but hasn't", class->fields [i].name, class->name);
 259                         class->fields [i].data = mono_cli_rva_map (class->image->image_info, rva);
 260                 }
 261
 262                 if (class->enumtype && !(cols [MONO_FIELD_FLAGS] & FIELD_ATTRIBUTE_STATIC)) {
 263                         class->enum_basetype = class->fields [i].type;
 264                         class->cast_class = class->element_class = mono_class_from_mono_type (class->enum_basetype);
 265                         blittable = class->element_class->blittable;
 266                 }
 267         }
 268
 269         if (class == mono_defaults.string_class)
 270                 blittable = FALSE;
 271
 272         class->blittable = blittable;
 273
 274         if (class->enumtype && !class->enum_basetype) {
 275                 if (!((strcmp (class->name, "Enum") == 0) && (strcmp (class->name_space, "System") == 0)))
 276                         G_BREAKPOINT ();
 277         }
 278         mono_class_layout_fields (class);
 279 }
 280
 281 void
 282 mono_class_layout_fields (MonoClass *class)
 283 {
 284         int i;
 285         const int top = class->field.count;
 286         guint32 layout = class->flags & TYPE_ATTRIBUTE_LAYOUT_MASK;
 287
 288         /*
 289          * Compute field layout and total size (not considering static fields)
 290          */
 291         switch (layout) {
 292         case TYPE_ATTRIBUTE_AUTO_LAYOUT:
 293         case TYPE_ATTRIBUTE_SEQUENTIAL_LAYOUT:
 294                 for (i = 0; i < top; i++){
 295                         int size, align;
 296
 297                         if (class->fields [i].type->attrs & FIELD_ATTRIBUTE_STATIC)
 298                                 continue;
 299
 300                         size = mono_type_size (class->fields [i].type, &align);
 301
 302                         /* FIXME (LAMESPEC): should we also change the min alignment according to pack? */
 303                         align = class->packing_size ? MIN (class->packing_size, align): align;
 304                         class->min_align = MAX (align, class->min_align);
 305                         class->fields [i].offset = class->instance_size;
 306                         class->fields [i].offset += align - 1;
 307                         class->fields [i].offset &= ~(align - 1);
 308                         class->instance_size = class->fields [i].offset + size;
 309
 310                 }
 311
 312                 if (class->instance_size & (class->min_align - 1)) {
 313                         class->instance_size += class->min_align - 1;
 314                         class->instance_size &= ~(class->min_align - 1);
 315                 }
 316                 break;
 317         case TYPE_ATTRIBUTE_EXPLICIT_LAYOUT:
 318                 for (i = 0; i < top; i++) {
 319                         int size, align;
 320
 321                         /*
 322                          * There must be info about all the fields in a type if it
 323                          * uses explicit layout.
 324                          */
 325
 326                         if (class->fields [i].type->attrs & FIELD_ATTRIBUTE_STATIC)
 327                                 continue;
 328
 329                         size = mono_type_size (class->fields [i].type, &align);
 330
 331                         /*
 332                          * When we get here, class->fields [i].offset is already set by the
 333                          * loader (for either runtime fields or fields loaded from metadata).
 334                          * The offset is from the start of the object: this works for both
 335                          * classes and valuetypes.
 336                          */
 337                         class->fields [i].offset += sizeof (MonoObject);
 338                         /*
 339                          * Calc max size.
 340                          */
 341                         class->instance_size = MAX (class->instance_size, size + class->fields [i].offset);
 342                 }
 343                 break;
 344         }
 345
 346         class->size_inited = 1;
 347
 348         /*
 349          * Compute static field layout and size
 350          */
 351         switch (layout) {
 352         case TYPE_ATTRIBUTE_AUTO_LAYOUT:
 353         case TYPE_ATTRIBUTE_SEQUENTIAL_LAYOUT:
 354                 for (i = 0; i < top; i++){
 355                         int size, align;
 356
 357                         if (!(class->fields [i].type->attrs & FIELD_ATTRIBUTE_STATIC))
 358                                 continue;
 359
 360                         size = mono_type_size (class->fields [i].type, &align);
 361                         class->fields [i].offset = class->class_size;
 362                         class->fields [i].offset += align - 1;
 363                         class->fields [i].offset &= ~(align - 1);
 364                         class->class_size = class->fields [i].offset + size;
 365                 }
 366                 break;
 367         case TYPE_ATTRIBUTE_EXPLICIT_LAYOUT:
 368                 for (i = 0; i < top; i++){
 369                         int size, align;
 370
 371                         /*
 372                          * There must be info about all the fields in a type if it
 373                          * uses explicit layout.
 374                          */
 375
 376
 377                         if (!(class->fields [i].type->attrs & FIELD_ATTRIBUTE_STATIC))
 378                                 continue;
 379
 380                         size = mono_type_size (class->fields [i].type, &align);
 381                         class->fields [i].offset = class->class_size;
 382                         class->fields [i].offset += align - 1;
 383                         class->fields [i].offset &= ~(align - 1);
 384                         class->class_size = class->fields [i].offset + size;
 385                 }
 386                 break;
 387         }
 388 }
 389
 390 static void
 391 init_properties (MonoClass *class)
 392 {
 393         guint startm, endm, i, j;
 394         guint32 cols [MONO_PROPERTY_SIZE];
 395         MonoTableInfo *pt = &class->image->tables [MONO_TABLE_PROPERTY];
 396         MonoTableInfo *msemt = &class->image->tables [MONO_TABLE_METHODSEMANTICS];
 397
 398         class->property.first = mono_metadata_properties_from_typedef (class->image, mono_metadata_token_index (class->type_token) - 1, &class->property.last);
 399         class->property.count = class->property.last - class->property.first;
 400
 401         class->properties = g_new0 (MonoProperty, class->property.count);
 402         for (i = class->property.first; i < class->property.last; ++i) {
 403                 mono_metadata_decode_row (pt, i, cols, MONO_PROPERTY_SIZE);
 404                 class->properties [i - class->property.first].attrs = cols [MONO_PROPERTY_FLAGS];
 405                 class->properties [i - class->property.first].name = mono_metadata_string_heap (class->image, cols [MONO_PROPERTY_NAME]);
 406
 407                 startm = mono_metadata_methods_from_property (class->image, i, &endm);
 408                 for (j = startm; j < endm; ++j) {
 409                         mono_metadata_decode_row (msemt, j, cols, MONO_METHOD_SEMA_SIZE);
 410                         switch (cols [MONO_METHOD_SEMA_SEMANTICS]) {
 411                         case METHOD_SEMANTIC_SETTER:
 412                                 class->properties [i - class->property.first].set = class->methods [cols [MONO_METHOD_SEMA_METHOD] - 1 - class->method.first];
 413                                 break;
 414                         case METHOD_SEMANTIC_GETTER:
 415                                 class->properties [i - class->property.first].get = class->methods [cols [MONO_METHOD_SEMA_METHOD] - 1 - class->method.first];
 416                                 break;
 417                         default:
 418                                 break;
 419                         }
 420                 }
 421         }
 422 }
 423
 424 static void
 425 init_events (MonoClass *class)
 426 {
 427         guint startm, endm, i, j;
 428         guint32 cols [MONO_EVENT_SIZE];
 429         MonoTableInfo *pt = &class->image->tables [MONO_TABLE_EVENT];
 430         MonoTableInfo *msemt = &class->image->tables [MONO_TABLE_METHODSEMANTICS];
 431
 432         class->event.first = mono_metadata_events_from_typedef (class->image, mono_metadata_token_index (class->type_token) - 1, &class->event.last);
 433         class->event.count = class->event.last - class->event.first;
 434
 435         class->events = g_new0 (MonoEvent, class->event.count);
 436         for (i = class->event.first; i < class->event.last; ++i) {
 437                 mono_metadata_decode_row (pt, i, cols, MONO_EVENT_SIZE);
 438                 class->events [i - class->event.first].attrs = cols [MONO_EVENT_FLAGS];
 439                 class->events [i - class->event.first].name = mono_metadata_string_heap (class->image, cols [MONO_EVENT_NAME]);
 440
 441                 startm = mono_metadata_methods_from_event (class->image, i, &endm);
 442                 for (j = startm; j < endm; ++j) {
 443                         mono_metadata_decode_row (msemt, j, cols, MONO_METHOD_SEMA_SIZE);
 444                         switch (cols [MONO_METHOD_SEMA_SEMANTICS]) {
 445                         case METHOD_SEMANTIC_ADD_ON:
 446                                 class->events [i - class->event.first].add = class->methods [cols [MONO_METHOD_SEMA_METHOD] - 1 - class->method.first];
 447                                 break;
 448                         case METHOD_SEMANTIC_REMOVE_ON:
 449                                 class->events [i - class->event.first].remove = class->methods [cols [MONO_METHOD_SEMA_METHOD] - 1 - class->method.first];
 450                                 break;
 451                         case METHOD_SEMANTIC_FIRE:
 452                                 class->events [i - class->event.first].raise = class->methods [cols [MONO_METHOD_SEMA_METHOD] - 1 - class->method.first];
 453                                 break;
 454                         case METHOD_SEMANTIC_OTHER: /* don't care for now */
 455                         default:
 456                                 break;
 457                         }
 458                 }
 459         }
 460 }
 461
 462 static guint
 463 mono_get_unique_iid (MonoClass *class)
 464 {
 465         static GHashTable *iid_hash = NULL;
 466         static guint iid = 0;
 467
 468         char *str;
 469         gpointer value;
 470
 471         g_assert (class->flags & TYPE_ATTRIBUTE_INTERFACE);
 472
 473         if (!iid_hash)
 474                 iid_hash = g_hash_table_new (g_str_hash, g_str_equal);
 475
 476         str = g_strdup_printf ("%s|%s.%s\n", class->image->name, class->name_space, class->name);
 477
 478         if (g_hash_table_lookup_extended (iid_hash, str, NULL, &value)) {
 479                 g_free (str);
 480                 return (guint)value;
 481         } else {
 482                 g_hash_table_insert (iid_hash, str, (gpointer)iid);
 483                 ++iid;
 484         }
 485
 486         return iid - 1;
 487 }
 488
 489 void
 490 mono_class_setup_vtable (MonoClass *class)
 491 {
 492         MonoClass *k, *ic;
 493         MonoMethod **vtable;
 494         int i, onum = 0, max_vtsize = 0, max_iid, cur_slot = 0;
 495         MonoMethod **overrides;
 496
 497         /* setup_vtable() must be called only once on the type */
 498         if (class->interface_offsets) {
 499                 g_warning ("vtable already computed in %s.%s", class->name_space, class->name);
 500                 return;
 501         }
 502
 503         for (i = 0; i < class->interface_count; i++)
 504                 max_vtsize += class->interfaces [i]->method.count;
 505
 506         if (class->parent) {
 507                 max_vtsize += class->parent->vtable_size;
 508                 cur_slot = class->parent->vtable_size;
 509         }
 510
 511         max_vtsize += class->method.count;
 512
 513         vtable = alloca (sizeof (gpointer) * max_vtsize);
 514         memset (vtable, 0, sizeof (gpointer) * max_vtsize);
 515
 516         /* printf ("METAINIT %s.%s\n", class->name_space, class->name); */
 517
 518         /* compute maximum number of slots and maximum interface id */
 519         max_iid = 0;
 520         for (k = class; k ; k = k->parent) {
 521                 for (i = 0; i < k->interface_count; i++) {
 522                         ic = k->interfaces [i];
 523
 524                         if (!ic->inited)
 525                                 mono_class_init (ic);
 526
 527                         if (max_iid < ic->interface_id)
 528                                 max_iid = ic->interface_id;
 529                 }
 530         }
 531
 532         class->max_interface_id = max_iid;
 533         /* compute vtable offset for interfaces */
 534         class->interface_offsets = g_malloc (sizeof (gpointer) * (max_iid + 1));
 535
 536         for (i = 0; i <= max_iid; i++)
 537                 class->interface_offsets [i] = -1;
 538
 539         for (i = 0; i < class->interface_count; i++) {
 540                 ic = class->interfaces [i];
 541                 class->interface_offsets [ic->interface_id] = cur_slot;
 542                 cur_slot += ic->method.count;
 543         }
 544
 545         for (k = class->parent; k ; k = k->parent) {
 546                 for (i = 0; i < k->interface_count; i++) {
 547                         ic = k->interfaces [i];
 548                         if (class->interface_offsets [ic->interface_id] == -1) {
 549                                 int io = k->interface_offsets [ic->interface_id];
 550
 551                                 g_assert (io >= 0);
 552                                 g_assert (io <= max_vtsize);
 553
 554                                 class->interface_offsets [ic->interface_id] = io;
 555                         }
 556                 }
 557         }
 558
 559         if (class->parent && class->parent->vtable_size)
 560                 memcpy (vtable, class->parent->vtable,  sizeof (gpointer) * class->parent->vtable_size);
 561
 562         overrides = mono_class_get_overrides (class->image, class->type_token, &onum);
 563
 564         /* override interface methods */
 565         for (i = 0; i < onum; i++) {
 566                 MonoMethod *decl = overrides [i*2];
 567                 if (decl->klass->flags & TYPE_ATTRIBUTE_INTERFACE) {
 568                         int dslot;
 569                         g_assert (decl->slot != -1);
 570                         dslot = decl->slot + class->interface_offsets [decl->klass->interface_id];
 571                         vtable [dslot] = overrides [i*2 + 1];
 572                 }
 573         }
 574
 575         for (k = class; k ; k = k->parent) {
 576                 for (i = 0; i < k->interface_count; i++) {
 577                         int j, l, io;
 578
 579                         ic = k->interfaces [i];
 580                         io = k->interface_offsets [ic->interface_id];
 581
 582                         g_assert (io >= 0);
 583                         g_assert (io <= max_vtsize);
 584
 585                         if (k == class) {
 586                                 for (l = 0; l < ic->method.count; l++) {
 587                                         MonoMethod *im = ic->methods [l];
 588                                         for (j = 0; j < class->method.count; ++j) {
 589                                                 MonoMethod *cm = class->methods [j];
 590                                                 if (!(cm->flags & METHOD_ATTRIBUTE_VIRTUAL) ||
 591                                                     !(cm->flags & METHOD_ATTRIBUTE_PUBLIC) ||
 592                                                     !(cm->flags & METHOD_ATTRIBUTE_NEW_SLOT))
 593                                                         continue;
 594                                                 if (!strcmp(cm->name, im->name) &&
 595                                                     mono_metadata_signature_equal (cm->signature, im->signature)) {
 596                                                         g_assert (io + l <= max_vtsize);
 597                                                         vtable [io + l] = cm;
 598                                                 }
 599                                         }
 600                                 }
 601                         } else {
 602                                 /* already implemented */
 603                                 if (io >= k->vtable_size)
 604                                         continue;
 605                         }
 606
 607                         for (l = 0; l < ic->method.count; l++) {
 608                                 MonoMethod *im = ic->methods [l];
 609                                 MonoClass *k1;
 610
 611                                 g_assert (io + l <= max_vtsize);
 612
 613                                 if (vtable [io + l])
 614                                         continue;
 615
 616                                 for (k1 = class; k1; k1 = k1->parent) {
 617                                         for (j = 0; j < k1->method.count; ++j) {
 618                                                 MonoMethod *cm = k1->methods [j];
 619
 620                                                 if (!(cm->flags & METHOD_ATTRIBUTE_VIRTUAL) ||
 621                                                     !(cm->flags & METHOD_ATTRIBUTE_PUBLIC))
 622                                                         continue;
 623
 624                                                 if (!strcmp(cm->name, im->name) &&
 625                                                     mono_metadata_signature_equal (cm->signature, im->signature)) {
 626                                                         g_assert (io + l <= max_vtsize);
 627                                                         vtable [io + l] = cm;
 628                                                         break;
 629                                                 }
 630
 631                                         }
 632                                         g_assert (io + l <= max_vtsize);
 633                                         if (vtable [io + l])
 634                                                 break;
 635                                 }
 636                         }
 637
 638                         for (l = 0; l < ic->method.count; l++) {
 639                                 MonoMethod *im = ic->methods [l];
 640                                 char *qname, *fqname;
 641                                 MonoClass *k1;
 642
 643                                 if (vtable [io + l])
 644                                         continue;
 645
 646                                 qname = g_strconcat (ic->name, ".", im->name, NULL);
 647                                 if (ic->name_space && ic->name_space [0])
 648                                         fqname = g_strconcat (ic->name_space, ".", ic->name, ".", im->name, NULL);
 649                                 else
 650                                         fqname = NULL;
 651
 652                                 for (k1 = class; k1; k1 = k1->parent) {
 653                                         for (j = 0; j < k1->method.count; ++j) {
 654                                                 MonoMethod *cm = k1->methods [j];
 655
 656                                                 if (!(cm->flags & METHOD_ATTRIBUTE_VIRTUAL))
 657                                                         continue;
 658
 659                                                 if (((fqname && !strcmp (cm->name, fqname)) || !strcmp (cm->name, qname)) &&
 660                                                     mono_metadata_signature_equal (cm->signature, im->signature)) {
 661                                                         g_assert (io + l <= max_vtsize);
 662                                                         vtable [io + l] = cm;
 663                                                         break;
 664                                                 }
 665                                         }
 666                                 }
 667                                 g_free (qname);
 668                                 g_free (fqname);
 669                         }
 670
 671
 672                         if (!(class->flags & TYPE_ATTRIBUTE_ABSTRACT)) {
 673                                 for (l = 0; l < ic->method.count; l++) {
 674                                         char *msig;
 675                                         MonoMethod *im = ic->methods [l];
 676                                         g_assert (io + l <= max_vtsize);
 677                                         if (!(vtable [io + l])) {
 678                                                 for (j = 0; j < onum; ++j) {
 679                                                         g_print (" at slot %d: %s (%d) overrides %s (%d)\n", io+l, overrides [j*2+1]->name,
 680                                                                  overrides [j*2+1]->slot, overrides [j*2]->name, overrides [j*2]->slot);
 681                                                 }
 682                                                 msig = mono_signature_get_desc (im->signature, FALSE);
 683                                                 printf ("no implementation for interface method %s.%s::%s(%s) in class %s.%s\n",
 684                                                         ic->name_space, ic->name, im->name, msig, class->name_space, class->name);
 685                                                 g_free (msig);
 686                                                 for (j = 0; j < class->method.count; ++j) {
 687                                                         MonoMethod *cm = class->methods [j];
 688                                                         msig = mono_signature_get_desc (cm->signature, FALSE);
 689
 690                                                         printf ("METHOD %s(%s)\n", cm->name, msig);
 691                                                         g_free (msig);
 692                                                 }
 693                                                 g_assert_not_reached ();
 694                                         }
 695                                 }
 696                         }
 697
 698                         for (l = 0; l < ic->method.count; l++) {
 699                                 MonoMethod *im = vtable [io + l];
 700
 701                                 if (im) {
 702                                         g_assert (io + l <= max_vtsize);
 703                                         if (im->slot < 0) {
 704                                                 /* FIXME: why do we need this ? */
 705                                                 im->slot = io + l;
 706                                                 /* g_assert_not_reached (); */
 707                                         }
 708                                 }
 709                         }
 710                 }
 711         }
 712
 713         for (i = 0; i < class->method.count; ++i) {
 714                 MonoMethod *cm;
 715
 716                 cm = class->methods [i];
 717
 718
 719 #if 0
 720                 if (!(cm->flags & METHOD_ATTRIBUTE_VIRTUAL) ||
 721                     (cm->slot >= 0))
 722                         continue;
 723 #else  /* EXT_VTABLE_HACK */
 724                 if (cm->slot >= 0)
 725                         continue;
 726 #endif
 727
 728                 if (!(cm->flags & METHOD_ATTRIBUTE_NEW_SLOT) && (cm->flags & METHOD_ATTRIBUTE_VIRTUAL)) {
 729                         for (k = class->parent; k ; k = k->parent) {
 730                                 int j;
 731                                 for (j = 0; j < k->method.count; ++j) {
 732                                         MonoMethod *m1 = k->methods [j];
 733                                         if (!(m1->flags & METHOD_ATTRIBUTE_VIRTUAL))
 734                                                 continue;
 735                                         if (!strcmp(cm->name, m1->name) &&
 736                                             mono_metadata_signature_equal (cm->signature, m1->signature)) {
 737                                                 cm->slot = k->methods [j]->slot;
 738                                                 g_assert (cm->slot < max_vtsize);
 739                                                 break;
 740                                         }
 741                                 }
 742                                 if (cm->slot >= 0)
 743                                         break;
 744                         }
 745                 }
 746
 747                 if (cm->slot < 0)
 748                         cm->slot = cur_slot++;
 749
 750                 if (!(cm->flags & METHOD_ATTRIBUTE_ABSTRACT))
 751                         vtable [cm->slot] = cm;
 752         }
 753
 754         /* override non interface methods */
 755         for (i = 0; i < onum; i++) {
 756                 MonoMethod *decl = overrides [i*2];
 757                 if (!(decl->klass->flags & TYPE_ATTRIBUTE_INTERFACE)) {
 758                         g_assert (decl->slot != -1);
 759                         vtable [decl->slot] = overrides [i*2 + 1];
 760                 }
 761         }
 762
 763         g_free (overrides);
 764
 765         class->vtable_size = cur_slot;
 766         class->vtable = g_malloc0 (sizeof (gpointer) * class->vtable_size);
 767         memcpy (class->vtable, vtable,  sizeof (gpointer) * class->vtable_size);
 768
 769         if (mono_print_vtable) {
 770                 int icount = 0;
 771
 772                 for (i = 0; i <= max_iid; i++)
 773                         if (class->interface_offsets [i] != -1)
 774                                 icount++;
 775
 776                 printf ("VTable %s.%s (size = %d, interfaces = %d)\n", class->name_space,
 777                         class->name, class->vtable_size, icount);
 778
 779                 for (i = 0; i < class->vtable_size; ++i) {
 780                         MonoMethod *cm;
 781
 782                         cm = vtable [i];
 783                         if (cm) {
 784                                 printf ("  slot %03d(%03d) %s.%s:%s\n", i, cm->slot,
 785                                         cm->klass->name_space, cm->klass->name,
 786                                         cm->name);
 787                         }
 788                 }
 789
 790
 791                 if (icount) {
 792                         printf ("Interfaces %s.%s (max_iid = %d)\n", class->name_space,
 793                                 class->name, max_iid);
 794
 795                         for (i = 0; i < class->interface_count; i++) {
 796                                 ic = class->interfaces [i];
 797                                 printf ("  slot %03d(%03d) %s.%s\n",
 798                                         class->interface_offsets [ic->interface_id],
 799                                         ic->method.count, ic->name_space, ic->name);
 800                         }
 801
 802                         for (k = class->parent; k ; k = k->parent) {
 803                                 for (i = 0; i < k->interface_count; i++) {
 804                                         ic = k->interfaces [i];
 805                                         printf ("  slot %03d(%03d) %s.%s\n",
 806                                                 class->interface_offsets [ic->interface_id],
 807                                                 ic->method.count, ic->name_space, ic->name);
 808                                 }
 809                         }
 810                 }
 811         }
 812
 813 }
 814
 815 /**
 816  * mono_class_init:
 817  * @class: the class to initialize
 818  *
 819  * compute the instance_size, class_size and other infos that cannot be
 820  * computed at mono_class_get() time. Also compute a generic vtable and
 821  * the method slot numbers. We use this infos later to create a domain
 822  * specific vtable.
 823  */
 824 void
 825 mono_class_init (MonoClass *class)
 826 {
 827         int i;
 828         static MonoMethod *default_ghc = NULL;
 829         static MonoMethod *default_finalize = NULL;
 830         static int finalize_slot = -1;
 831         static int ghc_slot = -1;
 832
 833         g_assert (class);
 834
 835         if (class->inited)
 836                 return;
 837
 838         if (class->init_pending) {
 839                 /* this indicates a cyclic dependency */
 840                 g_error ("pending init %s.%s\n", class->name_space, class->name);
 841         }
 842
 843         class->init_pending = 1;
 844
 845         mono_stats.initialized_class_count++;
 846
 847         if (class->parent && !class->parent->inited)
 848                 mono_class_init (class->parent);
 849
 850         /*
 851          * Computes the size used by the fields, and their locations
 852          */
 853         if (!class->size_inited)
 854                 class_compute_field_layout (class);
 855
 856         /* initialize method pointers */
 857         class->methods = g_new (MonoMethod*, class->method.count);
 858         for (i = 0; i < class->method.count; ++i)
 859                 class->methods [i] = mono_get_method (class->image,
 860                         MONO_TOKEN_METHOD_DEF | (i + class->method.first + 1), class);
 861
 862         init_properties (class);
 863         init_events (class);
 864
 865         i = mono_metadata_nesting_typedef (class->image, class->type_token);
 866         while (i) {
 867                 MonoClass* nclass;
 868                 guint32 cols [MONO_NESTED_CLASS_SIZE];
 869                 mono_metadata_decode_row (&class->image->tables [MONO_TABLE_NESTEDCLASS], i - 1, cols, MONO_NESTED_CLASS_SIZE);
 870                 if (cols [MONO_NESTED_CLASS_ENCLOSING] != mono_metadata_token_index (class->type_token))
 871                         break;
 872                 nclass = mono_class_create_from_typedef (class->image, MONO_TOKEN_TYPE_DEF | cols [MONO_NESTED_CLASS_NESTED]);
 873                 class->nested_classes = g_list_prepend (class->nested_classes, nclass);
 874                 ++i;
 875         }
 876
 877         if (class->flags & TYPE_ATTRIBUTE_INTERFACE) {
 878                 for (i = 0; i < class->method.count; ++i)
 879                         class->methods [i]->slot = i;
 880                 class->init_pending = 0;
 881                 class->inited = 1;
 882                 return;
 883         }
 884
 885         mono_class_setup_vtable (class);
 886
 887         class->inited = 1;
 888         class->init_pending = 0;
 889
 890         if (!default_ghc) {
 891                 if (class == mono_defaults.object_class) {
 892
 893                         for (i = 0; i < class->vtable_size; ++i) {
 894                                 MonoMethod *cm = class->vtable [i];
 895
 896                                 if (!strcmp (cm->name, "GetHashCode")) {
 897                                         ghc_slot = i;
 898                                         break;
 899                                 }
 900                         }
 901
 902                         g_assert (ghc_slot > 0);
 903
 904                         default_ghc = class->vtable [ghc_slot];
 905                 }
 906         }
 907
 908         class->ghcimpl = 1;
 909         if (class->parent) {
 910
 911                 if (class->vtable [ghc_slot] == default_ghc) {
 912                         class->ghcimpl = 0;
 913                 }
 914         }
 915
 916         if (!default_finalize) {
 917                 if (class == mono_defaults.object_class) {
 918
 919                         for (i = 0; i < class->vtable_size; ++i) {
 920                                 MonoMethod *cm = class->vtable [i];
 921
 922                                 if (!strcmp (cm->name, "Finalize")) {
 923                                         finalize_slot = i;
 924                                         break;
 925                                 }
 926                         }
 927
 928                         g_assert (finalize_slot > 0);
 929
 930                         default_finalize = class->vtable [finalize_slot];
 931                 }
 932         }
 933
 934         /* Object::Finalize should have empty implemenatation */
 935         class->has_finalize = 0;
 936         if (class->parent) {
 937                 if (class->vtable [finalize_slot] != default_finalize)
 938                         class->has_finalize = 1;
 939         }
 940
 941         if (mono_debugger_class_init_func)
 942                 mono_debugger_class_init_func (class);
 943 }
 944
 945
 946 /*
 947  * Compute a relative numbering of the class hierarchy as described in
 948  * "Java for Large-Scale Scientific Computations?"
 949  */
 950 static void
 951 mono_compute_relative_numbering (MonoClass *class, int *c)
 952 {
 953         GList *s;
 954
 955         (*c)++;
 956
 957         class->baseval = *c;
 958
 959         for (s = class->subclasses; s; s = s->next)
 960                 mono_compute_relative_numbering ((MonoClass *)s->data, c);
 961
 962         class->diffval = *c -  class->baseval;
 963 }
 964
 965 void
 966 mono_class_setup_mono_type (MonoClass *class)
 967 {
 968         const char *name = class->name;
 969         const char *nspace = class->name_space;
 970
 971         if (class->flags & TYPE_ATTRIBUTE_INTERFACE)
 972                 class->interface_id = mono_get_unique_iid (class);
 973
 974         class->this_arg.byref = 1;
 975         class->this_arg.data.klass = class;
 976         class->this_arg.type = MONO_TYPE_CLASS;
 977         class->byval_arg.data.klass = class;
 978         class->byval_arg.type = MONO_TYPE_CLASS;
 979
 980         if (!strcmp (nspace, "System")) {
 981                 if (!strcmp (name, "ValueType")) {
 982                         /*
 983                          * do not set the valuetype bit for System.ValueType.
 984                          * class->valuetype = 1;
 985                          */
 986                 } else if (!strcmp (name, "Enum")) {
 987                         /*
 988                          * do not set the valuetype bit for System.Enum.
 989                          * class->valuetype = 1;
 990                          */
 991                         class->valuetype = 0;
 992                         class->enumtype = 0;
 993                 } else if (!strcmp (name, "Object")) {
 994                         class->this_arg.type = class->byval_arg.type = MONO_TYPE_OBJECT;
 995                 } else if (!strcmp (name, "String")) {
 996                         class->this_arg.type = class->byval_arg.type = MONO_TYPE_STRING;
 997                 }
 998         }
 999
1000         if (class->valuetype) {
1001                 int t = MONO_TYPE_VALUETYPE;
1002                 if (!strcmp (nspace, "System")) {
1003                         switch (*name) {
1004                         case 'B':
1005                                 if (!strcmp (name, "Boolean")) {
1006                                         t = MONO_TYPE_BOOLEAN;
1007                                 } else if (!strcmp(name, "Byte")) {
1008                                         t = MONO_TYPE_U1;
1009                                         class->blittable = TRUE;
1010                                 }
1011                                 break;
1012                         case 'C':
1013                                 if (!strcmp (name, "Char")) {
1014                                         t = MONO_TYPE_CHAR;
1015                                 }
1016                                 break;
1017                         case 'D':
1018                                 if (!strcmp (name, "Double")) {
1019                                         t = MONO_TYPE_R8;
1020                                         class->blittable = TRUE;
1021                                 }
1022                                 break;
1023                         case 'I':
1024                                 if (!strcmp (name, "Int32")) {
1025                                         t = MONO_TYPE_I4;
1026                                         class->blittable = TRUE;
1027                                 } else if (!strcmp(name, "Int16")) {
1028                                         t = MONO_TYPE_I2;
1029                                         class->blittable = TRUE;
1030                                 } else if (!strcmp(name, "Int64")) {
1031                                         t = MONO_TYPE_I8;
1032                                         class->blittable = TRUE;
1033                                 } else if (!strcmp(name, "IntPtr")) {
1034                                         t = MONO_TYPE_I;
1035                                         class->blittable = TRUE;
1036                                 }
1037                                 break;
1038                         case 'S':
1039                                 if (!strcmp (name, "Single")) {
1040                                         t = MONO_TYPE_R4;
1041                                         class->blittable = TRUE;
1042                                 } else if (!strcmp(name, "SByte")) {
1043                                         t = MONO_TYPE_I1;
1044                                         class->blittable = TRUE;
1045                                 }
1046                                 break;
1047                         case 'U':
1048                                 if (!strcmp (name, "UInt32")) {
1049                                         t = MONO_TYPE_U4;
1050                                         class->blittable = TRUE;
1051                                 } else if (!strcmp(name, "UInt16")) {
1052                                         t = MONO_TYPE_U2;
1053                                         class->blittable = TRUE;
1054                                 } else if (!strcmp(name, "UInt64")) {
1055                                         t = MONO_TYPE_U8;
1056                                         class->blittable = TRUE;
1057                                 } else if (!strcmp(name, "UIntPtr")) {
1058                                         t = MONO_TYPE_U;
1059                                         class->blittable = TRUE;
1060                                 }
1061                                 break;
1062                         case 'V':
1063                                 if (!strcmp (name, "Void")) {
1064                                         t = MONO_TYPE_VOID;
1065                                 }
1066                                 break;
1067                         default:
1068                                 break;
1069                         }
1070                 }
1071                 class->this_arg.type = class->byval_arg.type = t;
1072         }
1073 }
1074
1075 void
1076 mono_class_setup_parent (MonoClass *class, MonoClass *parent)
1077 {
1078         gboolean system_namespace;
1079
1080         system_namespace = !strcmp (class->name_space, "System");
1081
1082         /* if root of the hierarchy */
1083         if (system_namespace && !strcmp (class->name, "Object")) {
1084                 class->parent = NULL;
1085                 class->instance_size = sizeof (MonoObject);
1086                 return;
1087         }
1088         if (!strcmp (class->name, "<Module>")) {
1089                 class->parent = NULL;
1090                 class->instance_size = 0;
1091                 return;
1092         }
1093
1094         if (!(class->flags & TYPE_ATTRIBUTE_INTERFACE)) {
1095                 int rnum = 0;
1096                 class->parent = parent;
1097
1098                 if (!parent)
1099                         g_assert_not_reached (); /* FIXME */
1100
1101                 class->marshalbyref = parent->marshalbyref;
1102                 class->contextbound  = parent->contextbound;
1103                 class->delegate  = parent->delegate;
1104
1105                 if (system_namespace) {
1106                         if (*class->name == 'M' && !strcmp (class->name, "MarshalByRefObject"))
1107                                 class->marshalbyref = 1;
1108
1109                         if (*class->name == 'C' && !strcmp (class->name, "ContextBoundObject"))
1110                                 class->contextbound  = 1;
1111
1112                         if (*class->name == 'D' && !strcmp (class->name, "Delegate"))
1113                                 class->delegate  = 1;
1114                 }
1115
1116                 if (class->parent->enumtype || ((strcmp (class->parent->name, "ValueType") == 0) &&
1117                                                 (strcmp (class->parent->name_space, "System") == 0)))
1118                         class->valuetype = 1;
1119                 if (((strcmp (class->parent->name, "Enum") == 0) && (strcmp (class->parent->name_space, "System") == 0))) {
1120                         class->valuetype = class->enumtype = 1;
1121                 }
1122                 /*class->enumtype = class->parent->enumtype; */
1123                 class->parent->subclasses = g_list_prepend (class->parent->subclasses, class);
1124                 mono_compute_relative_numbering (mono_defaults.object_class, &rnum);
1125         } else {
1126                 class->parent = NULL;
1127         }
1128
1129 }
1130
1131 /**
1132  * @image: context where the image is created
1133  * @type_token:  typedef token
1134  */
1135 static MonoClass *
1136 mono_class_create_from_typedef (MonoImage *image, guint32 type_token)
1137 {
1138         MonoTableInfo *tt = &image->tables [MONO_TABLE_TYPEDEF];
1139         MonoClass *class, *parent = NULL;
1140         guint32 cols [MONO_TYPEDEF_SIZE];
1141         guint32 cols_next [MONO_TYPEDEF_SIZE];
1142         guint tidx = mono_metadata_token_index (type_token);
1143         const char *name, *nspace;
1144         guint icount = 0;
1145         MonoClass **interfaces;
1146
1147         if ((class = g_hash_table_lookup (image->class_cache, GUINT_TO_POINTER (type_token))))
1148                 return class;
1149
1150         g_assert (mono_metadata_token_table (type_token) == MONO_TABLE_TYPEDEF);
1151
1152         mono_metadata_decode_row (tt, tidx - 1, cols, MONO_TYPEDEF_SIZE);
1153
1154         name = mono_metadata_string_heap (image, cols [MONO_TYPEDEF_NAME]);
1155         nspace = mono_metadata_string_heap (image, cols [MONO_TYPEDEF_NAMESPACE]);
1156
1157         if (cols [MONO_TYPEDEF_EXTENDS])
1158                 parent = mono_class_get (image, mono_metadata_token_from_dor (cols [MONO_TYPEDEF_EXTENDS]));
1159         interfaces = mono_metadata_interfaces_from_typedef (image, type_token, &icount);
1160
1161         class = g_malloc0 (sizeof (MonoClass));
1162
1163         g_hash_table_insert (image->class_cache, GUINT_TO_POINTER (type_token), class);
1164
1165         class->interfaces = interfaces;
1166         class->interface_count = icount;
1167
1168         class->name = name;
1169         class->name_space = nspace;
1170
1171         class->image = image;
1172         class->type_token = type_token;
1173         class->flags = cols [MONO_TYPEDEF_FLAGS];
1174
1175         if ((class->flags & TYPE_ATTRIBUTE_STRING_FORMAT_MASK) == TYPE_ATTRIBUTE_UNICODE_CLASS)
1176                 class->unicode = 1;
1177         /* fixme: maybe we must set this on windows
1178         if ((class->flags & TYPE_ATTRIBUTE_STRING_FORMAT_MASK) == TYPE_ATTRIBUTE_AUTO_CLASS)
1179                 class->unicode = 1;
1180         */
1181
1182         class->cast_class = class->element_class = class;
1183
1184         /*g_print ("Init class %s\n", name);*/
1185
1186         mono_class_setup_parent (class, parent);
1187
1188         mono_class_setup_mono_type (class);
1189
1190         /*
1191          * Compute the field and method lists
1192          */
1193         class->field.first  = cols [MONO_TYPEDEF_FIELD_LIST] - 1;
1194         class->method.first = cols [MONO_TYPEDEF_METHOD_LIST] - 1;
1195
1196         if (tt->rows > tidx){
1197                 mono_metadata_decode_row (tt, tidx, cols_next, CSIZE (cols_next));
1198                 class->field.last  = cols_next [MONO_TYPEDEF_FIELD_LIST] - 1;
1199                 class->method.last = cols_next [MONO_TYPEDEF_METHOD_LIST] - 1;
1200         } else {
1201                 class->field.last  = image->tables [MONO_TABLE_FIELD].rows;
1202                 class->method.last = image->tables [MONO_TABLE_METHOD].rows;
1203         }
1204
1205         if (cols [MONO_TYPEDEF_FIELD_LIST] &&
1206             cols [MONO_TYPEDEF_FIELD_LIST] <= image->tables [MONO_TABLE_FIELD].rows)
1207                 class->field.count = class->field.last - class->field.first;
1208         else
1209                 class->field.count = 0;
1210
1211         if (cols [MONO_TYPEDEF_METHOD_LIST] <= image->tables [MONO_TABLE_METHOD].rows)
1212                 class->method.count = class->method.last - class->method.first;
1213         else
1214                 class->method.count = 0;
1215
1216         /* reserve space to store vector pointer in arrays */
1217         if (!strcmp (nspace, "System") && !strcmp (name, "Array")) {
1218                 class->instance_size += 2 * sizeof (gpointer);
1219                 g_assert (class->field.count == 0);
1220         }
1221
1222         if (class->enumtype)
1223                 class_compute_field_layout (class);
1224
1225         if ((type_token = mono_metadata_nested_in_typedef (image, type_token)))
1226                 class->nested_in = mono_class_create_from_typedef (image, type_token);
1227
1228         return class;
1229 }
1230
1231 MonoClass *
1232 mono_ptr_class_get (MonoType *type)
1233 {
1234         MonoClass *result;
1235         MonoClass *el_class;
1236         static GHashTable *ptr_hash = NULL;
1237
1238         if (!ptr_hash)
1239                 ptr_hash = g_hash_table_new (g_direct_hash, g_direct_equal);
1240         el_class = mono_class_from_mono_type (type);
1241         if ((result = g_hash_table_lookup (ptr_hash, el_class)))
1242                 return result;
1243         result = g_new0 (MonoClass, 1);
1244
1245         result->parent = NULL; /* no parent for PTR types */
1246         result->name = "System";
1247         result->name_space = "MonoPtrFakeClass";
1248         result->image = el_class->image;
1249         result->inited = TRUE;
1250         /* Can pointers get boxed? */
1251         result->instance_size = sizeof (gpointer);
1252         /*
1253          * baseval, diffval: need them to allow casting ?
1254          */
1255         result->cast_class = result->element_class = el_class;
1256         result->enum_basetype = &result->element_class->byval_arg;
1257
1258         result->this_arg.type = result->byval_arg.type = MONO_TYPE_PTR;
1259         result->this_arg.data.type = result->byval_arg.data.type = result->enum_basetype;
1260         result->this_arg.byref = TRUE;
1261
1262         g_hash_table_insert (ptr_hash, el_class, result);
1263
1264         return result;
1265 }
1266
1267 MonoClass *
1268 mono_class_from_mono_type (MonoType *type)
1269 {
1270         switch (type->type) {
1271         case MONO_TYPE_OBJECT:
1272                 return mono_defaults.object_class;
1273         case MONO_TYPE_VOID:
1274                 return mono_defaults.void_class;
1275         case MONO_TYPE_BOOLEAN:
1276                 return mono_defaults.boolean_class;
1277         case MONO_TYPE_CHAR:
1278                 return mono_defaults.char_class;
1279         case MONO_TYPE_I1:
1280                 return mono_defaults.sbyte_class;
1281         case MONO_TYPE_U1:
1282                 return mono_defaults.byte_class;
1283         case MONO_TYPE_I2:
1284                 return mono_defaults.int16_class;
1285         case MONO_TYPE_U2:
1286                 return mono_defaults.uint16_class;
1287         case MONO_TYPE_I4:
1288                 return mono_defaults.int32_class;
1289         case MONO_TYPE_U4:
1290                 return mono_defaults.uint32_class;
1291         case MONO_TYPE_I:
1292                 return mono_defaults.int_class;
1293         case MONO_TYPE_U:
1294                 return mono_defaults.uint_class;
1295         case MONO_TYPE_I8:
1296                 return mono_defaults.int64_class;
1297         case MONO_TYPE_U8:
1298                 return mono_defaults.uint64_class;
1299         case MONO_TYPE_R4:
1300                 return mono_defaults.single_class;
1301         case MONO_TYPE_R8:
1302                 return mono_defaults.double_class;
1303         case MONO_TYPE_STRING:
1304                 return mono_defaults.string_class;
1305         case MONO_TYPE_ARRAY:
1306                 return mono_array_class_get (type->data.array->type, type->data.array->rank);
1307         case MONO_TYPE_PTR:
1308                 return mono_ptr_class_get (type->data.type);
1309         case MONO_TYPE_SZARRAY:
1310                 return mono_array_class_get (type->data.type, 1);
1311         case MONO_TYPE_CLASS:
1312         case MONO_TYPE_VALUETYPE:
1313                 return type->data.klass;
1314         default:
1315                 g_warning ("implement me %02x\n", type->type);
1316                 g_assert_not_reached ();
1317         }
1318
1319         return NULL;
1320 }
1321
1322 /**
1323  * @image: context where the image is created
1324  * @type_spec:  typespec token
1325  */
1326 static MonoClass *
1327 mono_class_create_from_typespec (MonoImage *image, guint32 type_spec)
1328 {
1329         MonoType *type;
1330         MonoClass *class;
1331
1332         type = mono_type_create_from_typespec (image, type_spec);
1333
1334         switch (type->type) {
1335         case MONO_TYPE_ARRAY:
1336                 class = mono_array_class_get (type->data.array->type, type->data.array->rank);
1337                 break;
1338         case MONO_TYPE_SZARRAY:
1339                 class = mono_array_class_get (type->data.type, 1);
1340                 break;
1341         case MONO_TYPE_PTR:
1342                 class = mono_class_from_mono_type (type->data.type);
1343                 break;
1344         default:
1345                 /* it seems any type can be stored in TypeSpec as well */
1346                 class = mono_class_from_mono_type (type);
1347                 break;
1348         }
1349
1350         mono_metadata_free_type (type);
1351
1352         return class;
1353 }
1354
1355 /**
1356  * mono_array_class_get:
1357  * @element_type: element type
1358  * @rank: the dimension of the array class
1359  *
1360  * Returns: a class object describing the array with element type @element_type and
1361  * dimension @rank.
1362  */
1363 MonoClass *
1364 mono_array_class_get (MonoType *element_type, guint32 rank)
1365 {
1366         MonoClass *eclass;
1367         MonoImage *image;
1368         MonoClass *class;
1369         MonoClass *parent = NULL;
1370         GSList *list;
1371         int rnum = 0, nsize;
1372         char *name;
1373
1374         eclass = mono_class_from_mono_type (element_type);
1375         g_assert (rank <= 255);
1376
1377         parent = mono_defaults.array_class;
1378
1379         if (!parent->inited)
1380                 mono_class_init (parent);
1381
1382         image = eclass->image;
1383
1384         if ((list = g_hash_table_lookup (image->array_cache, element_type))) {
1385                 for (; list; list = list->next) {
1386                         class = list->data;
1387                         if (class->rank == rank)
1388                                 return class;
1389                 }
1390         }
1391
1392         class = g_malloc0 (sizeof (MonoClass) + parent->vtable_size * sizeof (gpointer));
1393
1394         class->image = image;
1395         class->name_space = eclass->name_space;
1396         nsize = strlen (eclass->name);
1397         name = g_malloc (nsize + 2 + rank);
1398         memcpy (name, eclass->name, nsize);
1399         name [nsize] = '[';
1400         if (rank > 1)
1401                 memset (name + nsize + 1, ',', rank - 1);
1402         name [nsize + rank] = ']';
1403         name [nsize + rank + 1] = 0;
1404         class->name = name;
1405         class->type_token = 0;
1406         class->flags = TYPE_ATTRIBUTE_CLASS;
1407         class->parent = parent;
1408         class->instance_size = mono_class_instance_size (class->parent);
1409         class->class_size = 0;
1410         class->vtable_size = parent->vtable_size;
1411         class->parent->subclasses = g_list_prepend (class->parent->subclasses, class);
1412         mono_compute_relative_numbering (mono_defaults.object_class, &rnum);
1413
1414         class->rank = rank;
1415
1416         if (eclass->enumtype)
1417                 class->cast_class = eclass->element_class;
1418         else
1419                 class->cast_class = eclass;
1420
1421         class->element_class = eclass;
1422
1423         if (rank > 1) {
1424                 MonoArrayType *at = g_new0 (MonoArrayType, 1);
1425                 class->byval_arg.type = MONO_TYPE_ARRAY;
1426                 class->byval_arg.data.array = at;
1427                 at->type = &eclass->byval_arg;
1428                 at->rank = rank;
1429                 /* FIXME: complete.... */
1430         } else {
1431                 /* FIXME: this is not correct. the lbound could be >0 */
1432                 class->byval_arg.type = MONO_TYPE_SZARRAY;
1433                 class->byval_arg.data.type = &eclass->byval_arg;
1434         }
1435         class->this_arg = class->byval_arg;
1436         class->this_arg.byref = 1;
1437
1438         list = g_slist_append (list, class);
1439         g_hash_table_insert (image->array_cache, &class->element_class->byval_arg, list);
1440         return class;
1441 }
1442
1443 /**
1444  * mono_class_instance_size:
1445  * @klass: a class
1446  *
1447  * Returns: the size of an object instance
1448  */
1449 gint32
1450 mono_class_instance_size (MonoClass *klass)
1451 {
1452
1453         if (!klass->size_inited)
1454                 mono_class_init (klass);
1455
1456         return klass->instance_size;
1457 }
1458
1459 /**
1460  * mono_class_native_size:
1461  * @klass: a class
1462  *
1463  * Returns: the native size of an object instance (when marshaled
1464  * to unmanaged code)
1465  */
1466 gint32
1467 mono_class_native_size (MonoClass *klass, guint32 *align)
1468 {
1469
1470         if (!klass->marshal_info)
1471                 mono_marshal_load_type_info (klass);
1472
1473         if (align)
1474                 *align = klass->min_align;
1475
1476         return klass->marshal_info->native_size;
1477 }
1478
1479 /**
1480  * mono_class_min_align:
1481  * @klass: a class
1482  *
1483  * Returns: minimm alignment requirements
1484  */
1485 gint32
1486 mono_class_min_align (MonoClass *klass)
1487 {
1488
1489         if (!klass->size_inited)
1490                 mono_class_init (klass);
1491
1492         return klass->min_align;
1493 }
1494
1495 /**
1496  * mono_class_value_size:
1497  * @klass: a class
1498  *
1499  * This function is used for value types, and return the
1500  * space and the alignment to store that kind of value object.
1501  *
1502  * Returns: the size of a value of kind @klass
1503  */
1504 gint32
1505 mono_class_value_size      (MonoClass *klass, guint32 *align)
1506 {
1507         gint32 size;
1508
1509         /* fixme: check disable, because we still have external revereces to
1510          * mscorlib and Dummy Objects
1511          */
1512         /*g_assert (klass->valuetype);*/
1513
1514         size = mono_class_instance_size (klass) - sizeof (MonoObject);
1515
1516         if (align)
1517                 *align = klass->min_align;
1518
1519         return size;
1520 }
1521
1522 /**
1523  * mono_class_data_size:
1524  * @klass: a class
1525  *
1526  * Returns: the size of the static class data
1527  */
1528 gint32
1529 mono_class_data_size (MonoClass *klass)
1530 {
1531
1532         if (!klass->inited)
1533                 mono_class_init (klass);
1534
1535         return klass->class_size;
1536 }
1537
1538 /*
1539  * Auxiliary routine to mono_class_get_field
1540  *
1541  * Takes a field index instead of a field token.
1542  */
1543 static MonoClassField *
1544 mono_class_get_field_idx (MonoClass *class, int idx)
1545 {
1546         if (class->field.count){
1547                 if ((idx >= class->field.first) && (idx < class->field.last)){
1548                         return &class->fields [idx - class->field.first];
1549                 }
1550         }
1551
1552         if (!class->parent)
1553                 return NULL;
1554
1555         return mono_class_get_field_idx (class->parent, idx);
1556 }
1557
1558 /**
1559  * mono_class_get_field:
1560  * @class: the class to lookup the field.
1561  * @field_token: the field token
1562  *
1563  * Returns: A MonoClassField representing the type and offset of
1564  * the field, or a NULL value if the field does not belong to this
1565  * class.
1566  */
1567 MonoClassField *
1568 mono_class_get_field (MonoClass *class, guint32 field_token)
1569 {
1570         int idx = mono_metadata_token_index (field_token);
1571
1572         g_assert (mono_metadata_token_code (field_token) == MONO_TOKEN_FIELD_DEF);
1573
1574         return mono_class_get_field_idx (class, idx - 1);
1575 }
1576
1577 MonoClassField *
1578 mono_class_get_field_from_name (MonoClass *klass, const char *name)
1579 {
1580         int i;
1581
1582         while (klass) {
1583                 for (i = 0; i < klass->field.count; ++i) {
1584                         if (strcmp (name, klass->fields [i].name) == 0)
1585                                 return &klass->fields [i];
1586                 }
1587                 klass = klass->parent;
1588         }
1589         return NULL;
1590 }
1591
1592 MonoProperty*
1593 mono_class_get_property_from_name (MonoClass *klass, const char *name)
1594 {
1595         int i;
1596
1597         while (klass) {
1598                 for (i = 0; i < klass->property.count; ++i) {
1599                         if (strcmp (name, klass->properties [i].name) == 0)
1600                                 return &klass->properties [i];
1601                 }
1602                 klass = klass->parent;
1603         }
1604         return NULL;
1605 }
1606
1607 /**
1608  * mono_class_get:
1609  * @image: the image where the class resides
1610  * @type_token: the token for the class
1611  * @at: an optional pointer to return the array element type
1612  *
1613  * Returns: the MonoClass that represents @type_token in @image
1614  */
1615 MonoClass *
1616 mono_class_get (MonoImage *image, guint32 type_token)
1617 {
1618         MonoClass *class;
1619
1620         switch (type_token & 0xff000000){
1621         case MONO_TOKEN_TYPE_DEF:
1622                 class = mono_class_create_from_typedef (image, type_token);
1623                 break;
1624         case MONO_TOKEN_TYPE_REF:
1625                 class = mono_class_from_typeref (image, type_token);
1626                 break;
1627         case MONO_TOKEN_TYPE_SPEC:
1628                 class = mono_class_create_from_typespec (image, type_token);
1629                 break;
1630         default:
1631                 g_warning ("unknown token type %x", type_token & 0xff000000);
1632                 g_assert_not_reached ();
1633         }
1634
1635         if (!class)
1636                 g_warning ("Could not load class from token 0x%08x in %s", type_token, image->name);
1637
1638         return class;
1639 }
1640
1641 MonoClass *
1642 mono_class_from_name_case (MonoImage *image, const char* name_space, const char *name)
1643 {
1644         MonoTableInfo  *t = &image->tables [MONO_TABLE_TYPEDEF];
1645         guint32 cols [MONO_TYPEDEF_SIZE];
1646         const char *n;
1647         const char *nspace;
1648         guint32 i, visib;
1649
1650         /* add a cache if needed */
1651         for (i = 1; i <= t->rows; ++i) {
1652                 mono_metadata_decode_row (t, i - 1, cols, MONO_TYPEDEF_SIZE);
1653                 /* nested types are accessed from the nesting name */
1654                 visib = cols [MONO_TYPEDEF_FLAGS] & TYPE_ATTRIBUTE_VISIBILITY_MASK;
1655                 if (visib > TYPE_ATTRIBUTE_PUBLIC && visib <= TYPE_ATTRIBUTE_NESTED_ASSEMBLY)
1656                         continue;
1657                 n = mono_metadata_string_heap (image, cols [MONO_TYPEDEF_NAME]);
1658                 nspace = mono_metadata_string_heap (image, cols [MONO_TYPEDEF_NAMESPACE]);
1659                 if (g_strcasecmp (n, name) == 0 && g_strcasecmp (nspace, name_space) == 0)
1660                         return mono_class_get (image, MONO_TOKEN_TYPE_DEF | i);
1661         }
1662         return NULL;
1663 }
1664
1665 MonoClass *
1666 mono_class_from_name (MonoImage *image, const char* name_space, const char *name)
1667 {
1668         GHashTable *nspace_table;
1669         guint32 token;
1670
1671         nspace_table = g_hash_table_lookup (image->name_cache, name_space);
1672         if (!nspace_table)
1673                 return 0;
1674         token = GPOINTER_TO_UINT (g_hash_table_lookup (nspace_table, name));
1675
1676         if (!token) {
1677                 /*g_warning ("token not found for %s.%s in image %s", name_space, name, image->name);*/
1678                 return NULL;
1679         }
1680
1681         token = MONO_TOKEN_TYPE_DEF | token;
1682
1683         return mono_class_get (image, token);
1684 }
1685
1686 /**
1687  * mono_array_element_size:
1688  * @ac: pointer to a #MonoArrayClass
1689  *
1690  * Returns: the size of single array element.
1691  */
1692 gint32
1693 mono_array_element_size (MonoClass *ac)
1694 {
1695         if (ac->element_class->valuetype)
1696                 return mono_class_instance_size (ac->element_class) - sizeof (MonoObject);
1697         else
1698                 return sizeof (gpointer);
1699 }
1700
1701 gpointer
1702 mono_ldtoken (MonoImage *image, guint32 token, MonoClass **handle_class)
1703 {
1704         switch (token & 0xff000000) {
1705         case MONO_TOKEN_TYPE_DEF:
1706         case MONO_TOKEN_TYPE_REF: {
1707                 MonoClass *class;
1708                 if (handle_class)
1709                         *handle_class = mono_defaults.typehandle_class;
1710                 class = mono_class_get (image, token);
1711                 mono_class_init (class);
1712                 /* We return a MonoType* as handle */
1713                 return &class->byval_arg;
1714         }
1715         case MONO_TOKEN_TYPE_SPEC: {
1716                 MonoClass *class;
1717                 if (handle_class)
1718                         *handle_class = mono_defaults.typehandle_class;
1719                 class = mono_class_create_from_typespec (image, token);
1720                 mono_class_init (class);
1721                 return &class->byval_arg;
1722         }
1723         case MONO_TOKEN_FIELD_DEF: {
1724                 MonoClass *class;
1725                 guint32 type = mono_metadata_typedef_from_field (image, mono_metadata_token_index (token));
1726                 class = mono_class_get (image, MONO_TOKEN_TYPE_DEF | type);
1727                 mono_class_init (class);
1728                 if (handle_class)
1729                                 *handle_class = mono_class_from_name (mono_defaults.corlib, "System", "RuntimeFieldHandle");
1730                 return mono_class_get_field (class, token);
1731         }
1732         case MONO_TOKEN_METHOD_DEF:
1733         case MONO_TOKEN_MEMBER_REF:
1734         default:
1735                 g_warning ("Unknown token 0x%08x in ldtoken", token);
1736                 break;
1737         }
1738         return NULL;
1739 }
1740