mono/metadata/dynamic-image.c

   1 /*
   2  * dynamic-image.c: Images created at runtime.
   3  *
   4  *
   5  * Author:
   6  *   Paolo Molaro (lupus@ximian.com)
   7  *
   8  * Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
   9  * Copyright 2004-2009 Novell, Inc (http://www.novell.com)
  10  * Copyright 2011 Rodrigo Kumpera
  11  * Copyright 2016 Microsoft
  12  *
  13  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
  14  */
  15
  16 #include <config.h>
  17 #include <glib.h>
  18 #include "mono/metadata/object.h"
  19 #include "mono/metadata/dynamic-image-internals.h"
  20 #include "mono/metadata/dynamic-stream-internals.h"
  21 #include "mono/metadata/gc-internals.h"
  22 #include "mono/metadata/metadata-internals.h"
  23 #include "mono/metadata/profiler-private.h"
  24 #include "mono/metadata/reflection-internals.h"
  25 #include "mono/metadata/sre-internals.h"
  26 #include "mono/utils/checked-build.h"
  27 #include "mono/utils/mono-error-internals.h"
  28 #include "mono/utils/mono-os-mutex.h"
  29
  30 const unsigned char table_sizes [MONO_TABLE_NUM] = {
  31         MONO_MODULE_SIZE,
  32         MONO_TYPEREF_SIZE,
  33         MONO_TYPEDEF_SIZE,
  34         0,
  35         MONO_FIELD_SIZE,
  36         0,
  37         MONO_METHOD_SIZE,
  38         0,
  39         MONO_PARAM_SIZE,
  40         MONO_INTERFACEIMPL_SIZE,
  41         MONO_MEMBERREF_SIZE,    /* 0x0A */
  42         MONO_CONSTANT_SIZE,
  43         MONO_CUSTOM_ATTR_SIZE,
  44         MONO_FIELD_MARSHAL_SIZE,
  45         MONO_DECL_SECURITY_SIZE,
  46         MONO_CLASS_LAYOUT_SIZE,
  47         MONO_FIELD_LAYOUT_SIZE, /* 0x10 */
  48         MONO_STAND_ALONE_SIGNATURE_SIZE,
  49         MONO_EVENT_MAP_SIZE,
  50         0,
  51         MONO_EVENT_SIZE,
  52         MONO_PROPERTY_MAP_SIZE,
  53         0,
  54         MONO_PROPERTY_SIZE,
  55         MONO_METHOD_SEMA_SIZE,
  56         MONO_METHODIMPL_SIZE,
  57         MONO_MODULEREF_SIZE,    /* 0x1A */
  58         MONO_TYPESPEC_SIZE,
  59         MONO_IMPLMAP_SIZE,
  60         MONO_FIELD_RVA_SIZE,
  61         0,
  62         0,
  63         MONO_ASSEMBLY_SIZE,     /* 0x20 */
  64         MONO_ASSEMBLY_PROCESSOR_SIZE,
  65         MONO_ASSEMBLYOS_SIZE,
  66         MONO_ASSEMBLYREF_SIZE,
  67         MONO_ASSEMBLYREFPROC_SIZE,
  68         MONO_ASSEMBLYREFOS_SIZE,
  69         MONO_FILE_SIZE,
  70         MONO_EXP_TYPE_SIZE,
  71         MONO_MANIFEST_SIZE,
  72         MONO_NESTED_CLASS_SIZE,
  73
  74         MONO_GENERICPARAM_SIZE, /* 0x2A */
  75         MONO_METHODSPEC_SIZE,
  76         MONO_GENPARCONSTRAINT_SIZE
  77
  78 };
  79
  80 // The dynamic images list is only needed to support the mempool reference tracking feature in checked-build.
  81 static GPtrArray *dynamic_images;
  82 static mono_mutex_t dynamic_images_mutex;
  83
  84 static inline void
  85 dynamic_images_lock (void)
  86 {
  87         mono_os_mutex_lock (&dynamic_images_mutex);
  88 }
  89
  90 static inline void
  91 dynamic_images_unlock (void)
  92 {
  93         mono_os_mutex_unlock (&dynamic_images_mutex);
  94 }
  95
  96 void
  97 mono_dynamic_images_init (void)
  98 {
  99         mono_os_mutex_init (&dynamic_images_mutex);
 100 }
 101
 102 #ifndef DISABLE_REFLECTION_EMIT
 103 static void
 104 string_heap_init (MonoDynamicStream *sh)
 105 {
 106         mono_dynstream_init (sh);
 107 }
 108 #endif
 109
 110 #ifndef DISABLE_REFLECTION_EMIT
 111 static int
 112 mono_blob_entry_hash (const char* str)
 113 {
 114         MONO_REQ_GC_NEUTRAL_MODE;
 115
 116         guint len, h;
 117         const char *end;
 118         len = mono_metadata_decode_blob_size (str, &str);
 119         if (len > 0) {
 120                 end = str + len;
 121                 h = *str;
 122                 for (str += 1; str < end; str++)
 123                         h = (h << 5) - h + *str;
 124                 return h;
 125         } else {
 126                 return 0;
 127         }
 128 }
 129
 130 static gboolean
 131 mono_blob_entry_equal (const char *str1, const char *str2) {
 132         MONO_REQ_GC_NEUTRAL_MODE;
 133
 134         int len, len2;
 135         const char *end1;
 136         const char *end2;
 137         len = mono_metadata_decode_blob_size (str1, &end1);
 138         len2 = mono_metadata_decode_blob_size (str2, &end2);
 139         if (len != len2)
 140                 return 0;
 141         return memcmp (end1, end2, len) == 0;
 142 }
 143 #endif
 144
 145
 146 /**
 147  * mono_find_dynamic_image_owner:
 148  *
 149  * Find the dynamic image, if any, which a given pointer is located in the memory of.
 150  */
 151 MonoImage *
 152 mono_find_dynamic_image_owner (void *ptr)
 153 {
 154         MonoImage *owner = NULL;
 155         int i;
 156
 157         dynamic_images_lock ();
 158
 159         if (dynamic_images)
 160         {
 161                 for (i = 0; !owner && i < dynamic_images->len; ++i) {
 162                         MonoImage *image = (MonoImage *)g_ptr_array_index (dynamic_images, i);
 163                         if (mono_mempool_contains_addr (image->mempool, ptr))
 164                                 owner = image;
 165                 }
 166         }
 167
 168         dynamic_images_unlock ();
 169
 170         return owner;
 171 }
 172
 173 static inline void
 174 dynamic_image_lock (MonoDynamicImage *image)
 175 {
 176         MONO_ENTER_GC_SAFE;
 177         mono_image_lock ((MonoImage*)image);
 178         MONO_EXIT_GC_SAFE;
 179 }
 180
 181 static inline void
 182 dynamic_image_unlock (MonoDynamicImage *image)
 183 {
 184         mono_image_unlock ((MonoImage*)image);
 185 }
 186
 187 void
 188 mono_dynamic_image_register_token (MonoDynamicImage *assembly, guint32 token, MonoObject *obj)
 189 {
 190         MONO_REQ_GC_UNSAFE_MODE;
 191
 192         dynamic_image_lock (assembly);
 193         mono_g_hash_table_insert (assembly->tokens, GUINT_TO_POINTER (token), obj);
 194         dynamic_image_unlock (assembly);
 195 }
 196
 197 static MonoObject*
 198 lookup_dyn_token (MonoDynamicImage *assembly, guint32 token)
 199 {
 200         MONO_REQ_GC_UNSAFE_MODE;
 201
 202         MonoObject *obj;
 203
 204         dynamic_image_lock (assembly);
 205         obj = (MonoObject *)mono_g_hash_table_lookup (assembly->tokens, GUINT_TO_POINTER (token));
 206         dynamic_image_unlock (assembly);
 207
 208         return obj;
 209 }
 210
 211 /**
 212  *
 213  * mono_dynamic_image_is_valid_token:
 214  *
 215  * Returns TRUE if token is valid in the given image.
 216  *
 217  */
 218 gboolean
 219 mono_dynamic_image_is_valid_token (MonoDynamicImage *image, guint32 token)
 220 {
 221         return lookup_dyn_token (image, token) != NULL;
 222 }
 223
 224 #ifndef DISABLE_REFLECTION_EMIT
 225
 226 #endif /* DISABLE_REFLECTION_EMIT */
 227
 228 #ifndef DISABLE_REFLECTION_EMIT
 229 /**
 230  * mono_reflection_lookup_dynamic_token:
 231  *
 232  * Finish the Builder object pointed to by TOKEN and return the corresponding
 233  * runtime structure. If HANDLE_CLASS is not NULL, it is set to the class required by
 234  * mono_ldtoken. If valid_token is TRUE, assert if it is not found in the token->object
 235  * mapping table.
 236  *
 237  * LOCKING: Take the loader lock
 238  */
 239 gpointer
 240 mono_reflection_lookup_dynamic_token (MonoImage *image, guint32 token, gboolean valid_token, MonoClass **handle_class, MonoGenericContext *context, MonoError *error)
 241 {
 242         MonoDynamicImage *assembly = (MonoDynamicImage*)image;
 243         MonoObject *obj;
 244         MonoClass *klass;
 245
 246         mono_error_init (error);
 247
 248         obj = lookup_dyn_token (assembly, token);
 249         if (!obj) {
 250                 if (valid_token)
 251                         g_error ("Could not find required dynamic token 0x%08x", token);
 252                 else {
 253                         mono_error_set_execution_engine (error, "Could not find dynamic token 0x%08x", token);
 254                         return NULL;
 255                 }
 256         }
 257
 258         if (!handle_class)
 259                 handle_class = &klass;
 260         gpointer result = mono_reflection_resolve_object (image, obj, handle_class, context, error);
 261         return result;
 262 }
 263
 264 /*
 265  * mono_image_register_token:
 266  *
 267  *   Register the TOKEN->OBJ mapping in the mapping table in ASSEMBLY. This is required for
 268  * the Module.ResolveXXXToken () methods to work.
 269  */
 270 void
 271 mono_image_register_token (MonoDynamicImage *assembly, guint32 token, MonoObject *obj)
 272 {
 273         MonoObject *prev;
 274
 275         dynamic_image_lock (assembly);
 276         prev = (MonoObject *)mono_g_hash_table_lookup (assembly->tokens, GUINT_TO_POINTER (token));
 277         if (prev) {
 278                 /* There could be multiple MethodInfo objects with the same token */
 279                 //g_assert (prev == obj);
 280         } else {
 281                 mono_g_hash_table_insert (assembly->tokens, GUINT_TO_POINTER (token), obj);
 282         }
 283         dynamic_image_unlock (assembly);
 284 }
 285
 286 #else /* DISABLE_REFLECTION_EMIT */
 287
 288 gpointer
 289 mono_reflection_lookup_dynamic_token (MonoImage *image, guint32 token, gboolean valid_token, MonoClass **handle_class, MonoGenericContext *context, MonoError *error)
 290 {
 291         mono_error_init (error);
 292         return NULL;
 293 }
 294
 295 void
 296 mono_image_register_token (MonoDynamicImage *assembly, guint32 token, MonoObject *obj)
 297 {
 298 }
 299
 300 #endif /* DISABLE_REFLECTION_EMIT */
 301
 302 #ifndef DISABLE_REFLECTION_EMIT
 303 MonoDynamicImage*
 304 mono_dynamic_image_create (MonoDynamicAssembly *assembly, char *assembly_name, char *module_name)
 305 {
 306         static const guchar entrycode [16] = {0xff, 0x25, 0};
 307         MonoDynamicImage *image;
 308         int i;
 309
 310         const char *version;
 311
 312         if (!strcmp (mono_get_runtime_info ()->framework_version, "2.1"))
 313                 version = "v2.0.50727"; /* HACK: SL 2 enforces the .net 2 metadata version */
 314         else
 315                 version = mono_get_runtime_info ()->runtime_version;
 316
 317 #if HAVE_BOEHM_GC
 318         /* The MonoGHashTable's need GC tracking */
 319         image = (MonoDynamicImage *)GC_MALLOC (sizeof (MonoDynamicImage));
 320 #else
 321         image = g_new0 (MonoDynamicImage, 1);
 322 #endif
 323
 324         mono_profiler_module_event (&image->image, MONO_PROFILE_START_LOAD);
 325
 326         /*g_print ("created image %p\n", image);*/
 327         /* keep in sync with image.c */
 328         image->image.name = assembly_name;
 329         image->image.assembly_name = image->image.name; /* they may be different */
 330         image->image.module_name = module_name;
 331         image->image.version = g_strdup (version);
 332         image->image.md_version_major = 1;
 333         image->image.md_version_minor = 1;
 334         image->image.dynamic = TRUE;
 335
 336         image->image.references = g_new0 (MonoAssembly*, 1);
 337         image->image.references [0] = NULL;
 338
 339         mono_image_init (&image->image);
 340
 341         image->token_fixups = mono_g_hash_table_new_type ((GHashFunc)mono_object_hash, NULL, MONO_HASH_KEY_GC, MONO_ROOT_SOURCE_REFLECTION, "dynamic module token fixups table");
 342         image->method_to_table_idx = g_hash_table_new (NULL, NULL);
 343         image->field_to_table_idx = g_hash_table_new (NULL, NULL);
 344         image->method_aux_hash = g_hash_table_new (NULL, NULL);
 345         image->vararg_aux_hash = g_hash_table_new (NULL, NULL);
 346         image->handleref = g_hash_table_new (NULL, NULL);
 347         image->handleref_managed = mono_g_hash_table_new_type ((GHashFunc)mono_object_hash, NULL, MONO_HASH_KEY_GC, MONO_ROOT_SOURCE_REFLECTION, "dynamic module reference-to-token table");
 348         image->tokens = mono_g_hash_table_new_type (NULL, NULL, MONO_HASH_VALUE_GC, MONO_ROOT_SOURCE_REFLECTION, "dynamic module tokens table");
 349         image->generic_def_objects = mono_g_hash_table_new_type (NULL, NULL, MONO_HASH_VALUE_GC, MONO_ROOT_SOURCE_REFLECTION, "dynamic module generic definitions table");
 350         image->typespec = g_hash_table_new ((GHashFunc)mono_metadata_type_hash, (GCompareFunc)mono_metadata_type_equal);
 351         image->typeref = g_hash_table_new ((GHashFunc)mono_metadata_type_hash, (GCompareFunc)mono_metadata_type_equal);
 352         image->blob_cache = g_hash_table_new ((GHashFunc)mono_blob_entry_hash, (GCompareFunc)mono_blob_entry_equal);
 353         image->gen_params = g_ptr_array_new ();
 354         image->remapped_tokens = mono_g_hash_table_new_type (NULL, NULL, MONO_HASH_VALUE_GC, MONO_ROOT_SOURCE_REFLECTION, "dynamic module remapped tokens table");
 355
 356         /*g_print ("string heap create for image %p (%s)\n", image, module_name);*/
 357         string_heap_init (&image->sheap);
 358         mono_dynstream_add_data (&image->us, "", 1);
 359         mono_dynamic_image_add_to_blob_cached (image, (char*) "", 1, NULL, 0);
 360         /* import tables... */
 361         mono_dynstream_add_data (&image->code, (char*)entrycode, sizeof (entrycode));
 362         image->iat_offset = mono_dynstream_add_zero (&image->code, 8); /* two IAT entries */
 363         image->idt_offset = mono_dynstream_add_zero (&image->code, 2 * sizeof (MonoIDT)); /* two IDT entries */
 364         image->imp_names_offset = mono_dynstream_add_zero (&image->code, 2); /* flags for name entry */
 365         mono_dynstream_add_data (&image->code, "_CorExeMain", 12);
 366         mono_dynstream_add_data (&image->code, "mscoree.dll", 12);
 367         image->ilt_offset = mono_dynstream_add_zero (&image->code, 8); /* two ILT entries */
 368         mono_dynstream_data_align (&image->code);
 369
 370         image->cli_header_offset = mono_dynstream_add_zero (&image->code, sizeof (MonoCLIHeader));
 371
 372         for (i=0; i < MONO_TABLE_NUM; ++i) {
 373                 image->tables [i].next_idx = 1;
 374                 image->tables [i].columns = table_sizes [i];
 375         }
 376
 377         image->image.assembly = (MonoAssembly*)assembly;
 378         image->run = assembly->run;
 379         image->save = assembly->save;
 380         image->pe_kind = 0x1; /* ILOnly */
 381         image->machine = 0x14c; /* I386 */
 382
 383         mono_profiler_module_loaded (&image->image, MONO_PROFILE_OK);
 384
 385         dynamic_images_lock ();
 386
 387         if (!dynamic_images)
 388                 dynamic_images = g_ptr_array_new ();
 389
 390         g_ptr_array_add (dynamic_images, image);
 391
 392         dynamic_images_unlock ();
 393
 394         return image;
 395 }
 396 #else /* DISABLE_REFLECTION_EMIT */
 397 MonoDynamicImage*
 398 mono_dynamic_image_create (MonoDynamicAssembly *assembly, char *assembly_name, char *module_name)
 399 {
 400         g_assert_not_reached ();
 401         return NULL;
 402 }
 403 #endif /* DISABLE_REFLECTION_EMIT */
 404
 405 guint32
 406 mono_dynamic_image_add_to_blob_cached (MonoDynamicImage *assembly, char *b1, int s1, char *b2, int s2)
 407 {
 408         MONO_REQ_GC_NEUTRAL_MODE;
 409
 410         guint32 idx;
 411         char *copy;
 412         gpointer oldkey, oldval;
 413
 414         copy = (char *)g_malloc (s1+s2);
 415         memcpy (copy, b1, s1);
 416         memcpy (copy + s1, b2, s2);
 417         if (g_hash_table_lookup_extended (assembly->blob_cache, copy, &oldkey, &oldval)) {
 418                 g_free (copy);
 419                 idx = GPOINTER_TO_UINT (oldval);
 420         } else {
 421                 idx = mono_dynstream_add_data (&assembly->blob, b1, s1);
 422                 mono_dynstream_add_data (&assembly->blob, b2, s2);
 423                 g_hash_table_insert (assembly->blob_cache, copy, GUINT_TO_POINTER (idx));
 424         }
 425         return idx;
 426 }
 427
 428 void
 429 mono_dynimage_alloc_table (MonoDynamicTable *table, guint nrows)
 430 {
 431         MONO_REQ_GC_NEUTRAL_MODE;
 432
 433         table->rows = nrows;
 434         g_assert (table->columns);
 435         if (nrows + 1 >= table->alloc_rows) {
 436                 while (nrows + 1 >= table->alloc_rows) {
 437                         if (table->alloc_rows == 0)
 438                                 table->alloc_rows = 16;
 439                         else
 440                                 table->alloc_rows *= 2;
 441                 }
 442
 443                 table->values = (guint32 *)g_renew (guint32, table->values, (table->alloc_rows) * table->columns);
 444         }
 445 }
 446
 447
 448 static void
 449 free_blob_cache_entry (gpointer key, gpointer val, gpointer user_data)
 450 {
 451         g_free (key);
 452 }
 453
 454 static void
 455 release_hashtable (MonoGHashTable **hash)
 456 {
 457         if (*hash) {
 458                 mono_g_hash_table_destroy (*hash);
 459                 *hash = NULL;
 460         }
 461 }
 462
 463 void
 464 mono_dynamic_image_release_gc_roots (MonoDynamicImage *image)
 465 {
 466         release_hashtable (&image->token_fixups);
 467         release_hashtable (&image->handleref_managed);
 468         release_hashtable (&image->tokens);
 469         release_hashtable (&image->remapped_tokens);
 470         release_hashtable (&image->generic_def_objects);
 471 }
 472
 473 // Free dynamic image pass one: Free resources but not image itself
 474 void
 475 mono_dynamic_image_free (MonoDynamicImage *image)
 476 {
 477         MonoDynamicImage *di = image;
 478         GList *list;
 479         int i;
 480
 481         if (di->typespec)
 482                 g_hash_table_destroy (di->typespec);
 483         if (di->typeref)
 484                 g_hash_table_destroy (di->typeref);
 485         if (di->handleref)
 486                 g_hash_table_destroy (di->handleref);
 487         if (di->handleref_managed)
 488                 mono_g_hash_table_destroy (di->handleref_managed);
 489         if (di->tokens)
 490                 mono_g_hash_table_destroy (di->tokens);
 491         if (di->remapped_tokens)
 492                 mono_g_hash_table_destroy (di->remapped_tokens);
 493         if (di->generic_def_objects)
 494                 mono_g_hash_table_destroy (di->generic_def_objects);
 495         if (di->blob_cache) {
 496                 g_hash_table_foreach (di->blob_cache, free_blob_cache_entry, NULL);
 497                 g_hash_table_destroy (di->blob_cache);
 498         }
 499         if (di->standalonesig_cache)
 500                 g_hash_table_destroy (di->standalonesig_cache);
 501         for (list = di->array_methods; list; list = list->next) {
 502                 ArrayMethod *am = (ArrayMethod *)list->data;
 503                 mono_sre_array_method_free (am);
 504         }
 505         g_list_free (di->array_methods);
 506         if (di->gen_params) {
 507                 for (i = 0; i < di->gen_params->len; i++) {
 508                         GenericParamTableEntry *entry = (GenericParamTableEntry *)g_ptr_array_index (di->gen_params, i);
 509                         mono_sre_generic_param_table_entry_free (entry);
 510                 }
 511                 g_ptr_array_free (di->gen_params, TRUE);
 512         }
 513         if (di->token_fixups)
 514                 mono_g_hash_table_destroy (di->token_fixups);
 515         if (di->method_to_table_idx)
 516                 g_hash_table_destroy (di->method_to_table_idx);
 517         if (di->field_to_table_idx)
 518                 g_hash_table_destroy (di->field_to_table_idx);
 519         if (di->method_aux_hash)
 520                 g_hash_table_destroy (di->method_aux_hash);
 521         if (di->vararg_aux_hash)
 522                 g_hash_table_destroy (di->vararg_aux_hash);
 523         g_free (di->strong_name);
 524         g_free (di->win32_res);
 525         if (di->public_key)
 526                 g_free (di->public_key);
 527
 528         /*g_print ("string heap destroy for image %p\n", di);*/
 529         mono_dynamic_stream_reset (&di->sheap);
 530         mono_dynamic_stream_reset (&di->code);
 531         mono_dynamic_stream_reset (&di->resources);
 532         mono_dynamic_stream_reset (&di->us);
 533         mono_dynamic_stream_reset (&di->blob);
 534         mono_dynamic_stream_reset (&di->tstream);
 535         mono_dynamic_stream_reset (&di->guid);
 536         for (i = 0; i < MONO_TABLE_NUM; ++i) {
 537                 g_free (di->tables [i].values);
 538         }
 539
 540         dynamic_images_lock ();
 541
 542         if (dynamic_images)
 543                 g_ptr_array_remove (dynamic_images, di);
 544
 545         dynamic_images_unlock ();
 546 }
 547
 548 // Free dynamic image pass two: Free image itself (might never get called in some debug modes)
 549 void
 550 mono_dynamic_image_free_image (MonoDynamicImage *image)
 551 {
 552         /* See create_dynamic_mono_image () */
 553 #if HAVE_BOEHM_GC
 554         /* Allocated using GC_MALLOC */
 555 #else
 556         g_free (image);
 557 #endif
 558 }