mono/metadata/verify.c

   1 /*
   2  * verify.c:
   3  *
   4  * Author:
   5  *      Mono Project (http://www.mono-project.com)
   6  *
   7  * Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
   8  * Copyright 2004-2009 Novell, Inc (http://www.novell.com)
   9  */
  10 #include <config.h>
  11
  12 #include <mono/metadata/object-internals.h>
  13 #include <mono/metadata/verify.h>
  14 #include <mono/metadata/verify-internals.h>
  15 #include <mono/metadata/opcodes.h>
  16 #include <mono/metadata/tabledefs.h>
  17 #include <mono/metadata/reflection.h>
  18 #include <mono/metadata/debug-helpers.h>
  19 #include <mono/metadata/mono-endian.h>
  20 #include <mono/metadata/metadata.h>
  21 #include <mono/metadata/metadata-internals.h>
  22 #include <mono/metadata/class-internals.h>
  23 #include <mono/metadata/security-manager.h>
  24 #include <mono/metadata/security-core-clr.h>
  25 #include <mono/metadata/tokentype.h>
  26 #include <string.h>
  27 #include <signal.h>
  28 #include <ctype.h>
  29
  30
  31 static MiniVerifierMode verifier_mode = MONO_VERIFIER_MODE_OFF;
  32 static gboolean verify_all = FALSE;
  33
  34 /*
  35  * Set the desired level of checks for the verfier.
  36  *
  37  */
  38 void
  39 mono_verifier_set_mode (MiniVerifierMode mode)
  40 {
  41         verifier_mode = mode;
  42 }
  43
  44 void
  45 mono_verifier_enable_verify_all ()
  46 {
  47         verify_all = TRUE;
  48 }
  49
  50 #ifndef DISABLE_VERIFIER
  51 /*
  52  * Pull the list of opcodes
  53  */
  54 #define OPDEF(a,b,c,d,e,f,g,h,i,j) \
  55         a = i,
  56
  57 enum {
  58 #include "mono/cil/opcode.def"
  59         LAST = 0xff
  60 };
  61 #undef OPDEF
  62
  63 #ifdef MONO_VERIFIER_DEBUG
  64 #define VERIFIER_DEBUG(code) do { code } while (0)
  65 #else
  66 #define VERIFIER_DEBUG(code)
  67 #endif
  68
  69 //////////////////////////////////////////////////////////////////
  70 #define IS_STRICT_MODE(ctx) (((ctx)->level & MONO_VERIFY_NON_STRICT) == 0)
  71 #define IS_FAIL_FAST_MODE(ctx) (((ctx)->level & MONO_VERIFY_FAIL_FAST) == MONO_VERIFY_FAIL_FAST)
  72 #define IS_SKIP_VISIBILITY(ctx) (((ctx)->level & MONO_VERIFY_SKIP_VISIBILITY) == MONO_VERIFY_SKIP_VISIBILITY)
  73 #define IS_REPORT_ALL_ERRORS(ctx) (((ctx)->level & MONO_VERIFY_REPORT_ALL_ERRORS) == MONO_VERIFY_REPORT_ALL_ERRORS)
  74 #define CLEAR_PREFIX(ctx, prefix) do { (ctx)->prefix_set &= ~(prefix); } while (0)
  75 #define ADD_VERIFY_INFO(__ctx, __msg, __status, __exception)    \
  76         do {    \
  77                 MonoVerifyInfoExtended *vinfo = g_new (MonoVerifyInfoExtended, 1);      \
  78                 vinfo->info.status = __status;  \
  79                 vinfo->info.message = ( __msg );        \
  80                 vinfo->exception_type = (__exception);  \
  81                 (__ctx)->list = g_slist_prepend ((__ctx)->list, vinfo); \
  82         } while (0)
  83
  84 //TODO support MONO_VERIFY_REPORT_ALL_ERRORS
  85 #define ADD_VERIFY_ERROR(__ctx, __msg)  \
  86         do {    \
  87                 ADD_VERIFY_INFO(__ctx, __msg, MONO_VERIFY_ERROR, MONO_EXCEPTION_INVALID_PROGRAM); \
  88                 (__ctx)->valid = 0; \
  89         } while (0)
  90
  91 #define CODE_NOT_VERIFIABLE(__ctx, __msg) \
  92         do {    \
  93                 if ((__ctx)->verifiable || IS_REPORT_ALL_ERRORS (__ctx)) { \
  94                         ADD_VERIFY_INFO(__ctx, __msg, MONO_VERIFY_NOT_VERIFIABLE, MONO_EXCEPTION_UNVERIFIABLE_IL); \
  95                         (__ctx)->verifiable = 0; \
  96                         if (IS_FAIL_FAST_MODE (__ctx)) \
  97                                 (__ctx)->valid = 0; \
  98                 } \
  99         } while (0)
 100
 101 #define ADD_VERIFY_ERROR2(__ctx, __msg, __exception)    \
 102         do {    \
 103                 ADD_VERIFY_INFO(__ctx, __msg, MONO_VERIFY_ERROR, __exception); \
 104                 (__ctx)->valid = 0; \
 105         } while (0)
 106
 107 #define CODE_NOT_VERIFIABLE2(__ctx, __msg, __exception) \
 108         do {    \
 109                 if ((__ctx)->verifiable || IS_REPORT_ALL_ERRORS (__ctx)) { \
 110                         ADD_VERIFY_INFO(__ctx, __msg, MONO_VERIFY_NOT_VERIFIABLE, __exception); \
 111                         (__ctx)->verifiable = 0; \
 112                         if (IS_FAIL_FAST_MODE (__ctx)) \
 113                                 (__ctx)->valid = 0; \
 114                 } \
 115         } while (0)
 116 /*Flags to be used with ILCodeDesc::flags */
 117 enum {
 118         /*Instruction has not been processed.*/
 119         IL_CODE_FLAG_NOT_PROCESSED  = 0,
 120         /*Instruction was decoded by mono_method_verify loop.*/
 121         IL_CODE_FLAG_SEEN = 1,
 122         /*Instruction was target of a branch or is at a protected block boundary.*/
 123         IL_CODE_FLAG_WAS_TARGET = 2,
 124         /*Used by stack_init to avoid double initialize each entry.*/
 125         IL_CODE_FLAG_STACK_INITED = 4,
 126         /*Used by merge_stacks to decide if it should just copy the eval stack.*/
 127         IL_CODE_STACK_MERGED = 8,
 128         /*This instruction is part of the delegate construction sequence, it cannot be target of a branch.*/
 129         IL_CODE_DELEGATE_SEQUENCE = 0x10,
 130         /*This is a delegate created from a ldftn to a non final virtual method*/
 131         IL_CODE_LDFTN_DELEGATE_NONFINAL_VIRTUAL = 0x20,
 132         /*This is a call to a non final virtual method*/
 133         IL_CODE_CALL_NONFINAL_VIRTUAL = 0x40,
 134 };
 135
 136 typedef enum {
 137         RESULT_VALID,
 138         RESULT_UNVERIFIABLE,
 139         RESULT_INVALID
 140 } verify_result_t;
 141
 142 typedef struct {
 143         MonoType *type;
 144         int stype;
 145         MonoMethod *method;
 146 } ILStackDesc;
 147
 148
 149 typedef struct {
 150         ILStackDesc *stack;
 151         guint16 size;
 152         guint16 flags;
 153 } ILCodeDesc;
 154
 155 typedef struct {
 156         int max_args;
 157         int max_stack;
 158         int verifiable;
 159         int valid;
 160         int level;
 161
 162         int code_size;
 163         ILCodeDesc *code;
 164         ILCodeDesc eval;
 165
 166         MonoType **params;
 167         GSList *list;
 168         /*Allocated fnptr MonoType that should be freed by us.*/
 169         GSList *funptrs;
 170         /*Type dup'ed exception types from catch blocks.*/
 171         GSList *exception_types;
 172
 173         int num_locals;
 174         MonoType **locals;
 175
 176         /*TODO get rid of target here, need_merge in mono_method_verify and hoist the merging code in the branching code*/
 177         int target;
 178
 179         guint32 ip_offset;
 180         MonoMethodSignature *signature;
 181         MonoMethodHeader *header;
 182
 183         MonoGenericContext *generic_context;
 184         MonoImage *image;
 185         MonoMethod *method;
 186
 187         /*This flag helps solving a corner case of delegate verification in that you cannot have a "starg 0"
 188          *on a method that creates a delegate for a non-final virtual method using ldftn*/
 189         gboolean has_this_store;
 190
 191         /*This flag is used to control if the contructor of the parent class has been called.
 192          *If the this pointer is pushed on the eval stack and it's a reference type constructor and
 193          * super_ctor_called is false, the uninitialized flag is set on the pushed value.
 194          *
 195          * Poping an uninitialized this ptr from the eval stack is an unverifiable operation unless
 196          * the safe variant is used. Only a few opcodes can use it : dup, pop, ldfld, stfld and call to a constructor.
 197          */
 198         gboolean super_ctor_called;
 199
 200         guint32 prefix_set;
 201         gboolean has_flags;
 202         MonoType *constrained_type;
 203 } VerifyContext;
 204
 205 static void
 206 merge_stacks (VerifyContext *ctx, ILCodeDesc *from, ILCodeDesc *to, gboolean start, gboolean external);
 207
 208 static int
 209 get_stack_type (MonoType *type);
 210
 211 static gboolean
 212 mono_delegate_signature_equal (MonoMethodSignature *delegate_sig, MonoMethodSignature *method_sig, gboolean is_static_ldftn);
 213
 214 static gboolean
 215 mono_class_is_valid_generic_instantiation (VerifyContext *ctx, MonoClass *klass);
 216
 217 static gboolean
 218 mono_method_is_valid_generic_instantiation (VerifyContext *ctx, MonoMethod *method);
 219 //////////////////////////////////////////////////////////////////
 220
 221
 222
 223 enum {
 224         TYPE_INV = 0, /* leave at 0. */
 225         TYPE_I4  = 1,
 226         TYPE_I8  = 2,
 227         TYPE_NATIVE_INT = 3,
 228         TYPE_R8  = 4,
 229         /* Used by operator tables to resolve pointer types (managed & unmanaged) and by unmanaged pointer types*/
 230         TYPE_PTR  = 5,
 231         /* value types and classes */
 232         TYPE_COMPLEX = 6,
 233         /* Number of types, used to define the size of the tables*/
 234         TYPE_MAX = 6,
 235
 236         /* Used by tables to signal that a result is not verifiable*/
 237         NON_VERIFIABLE_RESULT = 0x80,
 238
 239         /*Mask used to extract just the type, excluding flags */
 240         TYPE_MASK = 0x0F,
 241
 242         /* The stack type is a managed pointer, unmask the value to res */
 243         POINTER_MASK = 0x100,
 244
 245         /*Stack type with the pointer mask*/
 246         RAW_TYPE_MASK = 0x10F,
 247
 248         /* Controlled Mutability Manager Pointer */
 249         CMMP_MASK = 0x200,
 250
 251         /* The stack type is a null literal*/
 252         NULL_LITERAL_MASK = 0x400,
 253
 254         /**Used by ldarg.0 and family to let delegate verification happens.*/
 255         THIS_POINTER_MASK = 0x800,
 256
 257         /**Signals that this is a boxed value type*/
 258         BOXED_MASK = 0x1000,
 259
 260         /*This is an unitialized this ref*/
 261         UNINIT_THIS_MASK = 0x2000,
 262 };
 263
 264 static const char* const
 265 type_names [TYPE_MAX + 1] = {
 266         "Invalid",
 267         "Int32",
 268         "Int64",
 269         "Native Int",
 270         "Float64",
 271         "Native Pointer",
 272         "Complex"
 273 };
 274
 275 enum {
 276         PREFIX_UNALIGNED = 1,
 277         PREFIX_VOLATILE  = 2,
 278         PREFIX_TAIL      = 4,
 279         PREFIX_CONSTRAINED = 8,
 280         PREFIX_READONLY = 16
 281 };
 282 //////////////////////////////////////////////////////////////////
 283
 284
 285 /*Token validation macros and functions */
 286 #define IS_MEMBER_REF(token) (mono_metadata_token_table (token) == MONO_TABLE_MEMBERREF)
 287 #define IS_METHOD_DEF(token) (mono_metadata_token_table (token) == MONO_TABLE_METHOD)
 288 #define IS_METHOD_SPEC(token) (mono_metadata_token_table (token) == MONO_TABLE_METHODSPEC)
 289 #define IS_FIELD_DEF(token) (mono_metadata_token_table (token) == MONO_TABLE_FIELD)
 290
 291 #define IS_TYPE_REF(token) (mono_metadata_token_table (token) == MONO_TABLE_TYPEREF)
 292 #define IS_TYPE_DEF(token) (mono_metadata_token_table (token) == MONO_TABLE_TYPEDEF)
 293 #define IS_TYPE_SPEC(token) (mono_metadata_token_table (token) == MONO_TABLE_TYPESPEC)
 294 #define IS_METHOD_DEF_OR_REF_OR_SPEC(token) (IS_METHOD_DEF (token) || IS_MEMBER_REF (token) || IS_METHOD_SPEC (token))
 295 #define IS_TYPE_DEF_OR_REF_OR_SPEC(token) (IS_TYPE_DEF (token) || IS_TYPE_REF (token) || IS_TYPE_SPEC (token))
 296 #define IS_FIELD_DEF_OR_REF(token) (IS_FIELD_DEF (token) || IS_MEMBER_REF (token))
 297
 298 /*
 299  * Verify if @token refers to a valid row on int's table.
 300  */
 301 static gboolean
 302 token_bounds_check (MonoImage *image, guint32 token)
 303 {
 304         if (image->dynamic)
 305                 return mono_reflection_is_valid_dynamic_token ((MonoDynamicImage*)image, token);
 306         return image->tables [mono_metadata_token_table (token)].rows >= mono_metadata_token_index (token);
 307 }
 308
 309 static MonoType *
 310 mono_type_create_fnptr_from_mono_method (VerifyContext *ctx, MonoMethod *method)
 311 {
 312         MonoType *res = g_new0 (MonoType, 1);
 313         //FIXME use mono_method_get_signature_full
 314         res->data.method = mono_method_signature (method);
 315         res->type = MONO_TYPE_FNPTR;
 316         ctx->funptrs = g_slist_prepend (ctx->funptrs, res);
 317         return res;
 318 }
 319
 320 /*
 321  * mono_type_is_enum_type:
 322  *
 323  * Returns TRUE if @type is an enum type.
 324  */
 325 static gboolean
 326 mono_type_is_enum_type (MonoType *type)
 327 {
 328         if (type->type == MONO_TYPE_VALUETYPE && type->data.klass->enumtype)
 329                 return TRUE;
 330         if (type->type == MONO_TYPE_GENERICINST && type->data.generic_class->container_class->enumtype)
 331                 return TRUE;
 332         return FALSE;
 333 }
 334
 335 /*
 336  * mono_type_is_value_type:
 337  *
 338  * Returns TRUE if @type is named after @namespace.@name.
 339  *
 340  */
 341 static gboolean
 342 mono_type_is_value_type (MonoType *type, const char *namespace, const char *name)
 343 {
 344         return type->type == MONO_TYPE_VALUETYPE &&
 345                 !strcmp (namespace, type->data.klass->name_space) &&
 346                 !strcmp (name, type->data.klass->name);
 347 }
 348
 349 /*
 350  * Returns TURE if @type is VAR or MVAR
 351  */
 352 static gboolean
 353 mono_type_is_generic_argument (MonoType *type)
 354 {
 355         return type->type == MONO_TYPE_VAR || type->type == MONO_TYPE_MVAR;
 356 }
 357
 358 /*
 359  * mono_type_get_underlying_type_any:
 360  *
 361  * This functions is just like mono_type_get_underlying_type but it doesn't care if the type is byref.
 362  *
 363  * Returns the underlying type of @type regardless if it is byref or not.
 364  */
 365 static MonoType*
 366 mono_type_get_underlying_type_any (MonoType *type)
 367 {
 368         if (type->type == MONO_TYPE_VALUETYPE && type->data.klass->enumtype)
 369                 return mono_class_enum_basetype (type->data.klass);
 370         if (type->type == MONO_TYPE_GENERICINST && type->data.generic_class->container_class->enumtype)
 371                 return mono_class_enum_basetype (type->data.generic_class->container_class);
 372         return type;
 373 }
 374
 375 static const char*
 376 mono_type_get_stack_name (MonoType *type)
 377 {
 378         return type_names [get_stack_type (type) & TYPE_MASK];
 379 }
 380
 381 #define CTOR_REQUIRED_FLAGS (METHOD_ATTRIBUTE_SPECIAL_NAME | METHOD_ATTRIBUTE_RT_SPECIAL_NAME)
 382 #define CTOR_INVALID_FLAGS (METHOD_ATTRIBUTE_STATIC)
 383
 384 static gboolean
 385 mono_method_is_constructor (MonoMethod *method)
 386 {
 387         return ((method->flags & CTOR_REQUIRED_FLAGS) == CTOR_REQUIRED_FLAGS &&
 388                         !(method->flags & CTOR_INVALID_FLAGS) &&
 389                         !strcmp (".ctor", method->name));
 390 }
 391
 392 static gboolean
 393 mono_class_has_default_constructor (MonoClass *klass)
 394 {
 395         MonoMethod *method;
 396         int i;
 397
 398         mono_class_setup_methods (klass);
 399
 400         for (i = 0; i < klass->method.count; ++i) {
 401                 method = klass->methods [i];
 402                 if (mono_method_is_constructor (method) &&
 403                         mono_method_signature (method)->param_count == 0 &&
 404                         (method->flags & METHOD_ATTRIBUTE_MEMBER_ACCESS_MASK) == METHOD_ATTRIBUTE_PUBLIC)
 405                         return TRUE;
 406         }
 407         return FALSE;
 408 }
 409
 410 static gboolean
 411 mono_class_interface_implements_interface (MonoClass *candidate, MonoClass *iface)
 412 {
 413         int i;
 414         do {
 415                 if (candidate == iface)
 416                         return TRUE;
 417                 mono_class_setup_interfaces (candidate);
 418                 for (i = 0; i < candidate->interface_count; ++i) {
 419                         if (candidate->interfaces [i] == iface || mono_class_interface_implements_interface (candidate->interfaces [i], iface))
 420                                 return TRUE;
 421                 }
 422                 candidate = candidate->parent;
 423         } while (candidate);
 424         return FALSE;
 425 }
 426
 427 /*
 428  * Verify if @type is valid for the given @ctx verification context.
 429  * this function checks for VAR and MVAR types that are invalid under the current verifier,
 430  */
 431 static gboolean
 432 mono_type_is_valid_type_in_context (MonoType *type, MonoGenericContext *context)
 433 {
 434         int i;
 435         MonoGenericInst *inst;
 436
 437         switch (type->type) {
 438         case MONO_TYPE_VAR:
 439         case MONO_TYPE_MVAR:
 440                 if (!context)
 441                         return FALSE;
 442                 inst = type->type == MONO_TYPE_VAR ? context->class_inst : context->method_inst;
 443                 if (!inst || mono_type_get_generic_param_num (type) >= inst->type_argc)
 444                         return FALSE;
 445                 break;
 446         case MONO_TYPE_SZARRAY:
 447                 return mono_type_is_valid_type_in_context (&type->data.klass->byval_arg, context);
 448         case MONO_TYPE_ARRAY:
 449                 return mono_type_is_valid_type_in_context (&type->data.array->eklass->byval_arg, context);
 450         case MONO_TYPE_PTR:
 451                 return mono_type_is_valid_type_in_context (type->data.type, context);
 452         case MONO_TYPE_GENERICINST:
 453                 inst = type->data.generic_class->context.class_inst;
 454                 if (!inst->is_open)
 455                         break;
 456                 for (i = 0; i < inst->type_argc; ++i)
 457                         if (!mono_type_is_valid_type_in_context (inst->type_argv [i], context))
 458                                 return FALSE;
 459                 break;
 460         }
 461         return TRUE;
 462 }
 463
 464 /*This function returns NULL if the type is not instantiatable*/
 465 static MonoType*
 466 verifier_inflate_type (VerifyContext *ctx, MonoType *type, MonoGenericContext *context)
 467 {
 468         MonoError error;
 469         MonoType *result;
 470
 471         result = mono_class_inflate_generic_type_checked (type, context, &error);
 472         if (!mono_error_ok (&error)) {
 473                 mono_error_cleanup (&error);
 474                 return NULL;
 475         }
 476         return result;
 477 }
 478 /*
 479  * Test if @candidate is a subtype of @target using the minimal possible information
 480  * TODO move the code for non finished TypeBuilders to here.
 481  */
 482 static gboolean
 483 mono_class_is_constraint_compatible (MonoClass *candidate, MonoClass *target)
 484 {
 485         if (candidate == target)
 486                 return TRUE;
 487         if (target == mono_defaults.object_class)
 488                         return TRUE;
 489
 490         //setup_supertypes don't mono_class_init anything
 491         mono_class_setup_supertypes (candidate);
 492         mono_class_setup_supertypes (target);
 493
 494         if (mono_class_has_parent (candidate, target))
 495                 return TRUE;
 496
 497         //if target is not a supertype it must be an interface
 498         if (!MONO_CLASS_IS_INTERFACE (target))
 499                         return FALSE;
 500
 501         if (candidate->image->dynamic && !candidate->wastypebuilder) {
 502                 MonoReflectionTypeBuilder *tb = candidate->reflection_info;
 503                 int j;
 504                 if (tb->interfaces) {
 505                         for (j = mono_array_length (tb->interfaces) - 1; j >= 0; --j) {
 506                                 MonoReflectionType *iface = mono_array_get (tb->interfaces, MonoReflectionType*, j);
 507                                 MonoClass *ifaceClass = mono_class_from_mono_type (iface->type);
 508                                 if (mono_class_is_constraint_compatible (ifaceClass, target)) {
 509                                         return TRUE;
 510                                 }
 511                         }
 512                 }
 513                 return FALSE;
 514         }
 515         return mono_class_interface_implements_interface (candidate, target);
 516 }
 517
 518 static gboolean
 519 is_valid_generic_instantiation (MonoGenericContainer *gc, MonoGenericContext *context, MonoGenericInst *ginst)
 520 {
 521         MonoError error;
 522         int i;
 523
 524         if (ginst->type_argc != gc->type_argc)
 525                 return FALSE;
 526
 527         for (i = 0; i < gc->type_argc; ++i) {
 528                 MonoGenericParamInfo *param_info = mono_generic_container_get_param_info (gc, i);
 529                 MonoClass *paramClass;
 530                 MonoClass **constraints;
 531
 532                 if (!param_info->constraints && !(param_info->flags & GENERIC_PARAMETER_ATTRIBUTE_SPECIAL_CONSTRAINTS_MASK))
 533                         continue;
 534                 if (mono_type_is_generic_argument (ginst->type_argv [i]))
 535                         continue; //it's not our job to validate type variables
 536
 537                 paramClass = mono_class_from_mono_type (ginst->type_argv [i]);
 538
 539                 if (paramClass->exception_type != MONO_EXCEPTION_NONE)
 540                         return FALSE;
 541
 542                 /*it's not safe to call mono_class_init from here*/
 543                 if (paramClass->generic_class && !paramClass->inited) {
 544                         if (!mono_class_is_valid_generic_instantiation (NULL, paramClass))
 545                                 return FALSE;
 546                 }
 547
 548                 if ((param_info->flags & GENERIC_PARAMETER_ATTRIBUTE_VALUE_TYPE_CONSTRAINT) && (!paramClass->valuetype || mono_class_is_nullable (paramClass)))
 549                         return FALSE;
 550
 551                 if ((param_info->flags & GENERIC_PARAMETER_ATTRIBUTE_REFERENCE_TYPE_CONSTRAINT) && paramClass->valuetype)
 552                         return FALSE;
 553
 554                 if ((param_info->flags & GENERIC_PARAMETER_ATTRIBUTE_CONSTRUCTOR_CONSTRAINT) && !paramClass->valuetype && !mono_class_has_default_constructor (paramClass))
 555                         return FALSE;
 556
 557                 if (!param_info->constraints)
 558                         continue;
 559
 560                 for (constraints = param_info->constraints; *constraints; ++constraints) {
 561                         MonoClass *ctr = *constraints;
 562                         MonoType *inflated;
 563
 564                         inflated = mono_class_inflate_generic_type_checked (&ctr->byval_arg, context, &error);
 565                         if (!mono_error_ok (&error)) {
 566                                 mono_error_cleanup (&error);
 567                                 return FALSE;
 568                         }
 569                         ctr = mono_class_from_mono_type (inflated);
 570                         mono_metadata_free_type (inflated);
 571
 572                         if (!mono_class_is_constraint_compatible (paramClass, ctr))
 573                                 return FALSE;
 574                 }
 575         }
 576         return TRUE;
 577 }
 578
 579 /*
 580  * Return true if @candidate is constraint compatible with @target.
 581  *
 582  * This means that @candidate constraints are a super set of @target constaints
 583  */
 584 static gboolean
 585 mono_generic_param_is_constraint_compatible (VerifyContext *ctx, MonoGenericParam *target, MonoGenericParam *candidate, MonoGenericContext *context)
 586 {
 587         MonoGenericParamInfo *tinfo = mono_generic_param_info (target);
 588         MonoGenericParamInfo *cinfo = mono_generic_param_info (candidate);
 589
 590         int tmask = tinfo->flags & GENERIC_PARAMETER_ATTRIBUTE_SPECIAL_CONSTRAINTS_MASK;
 591         int cmask = cinfo->flags & GENERIC_PARAMETER_ATTRIBUTE_SPECIAL_CONSTRAINTS_MASK;
 592         if ((tmask & cmask) != tmask)
 593                 return FALSE;
 594
 595         if (tinfo->constraints) {
 596                 MonoClass **target_class, **candidate_class;
 597                 if (!cinfo->constraints)
 598                         return FALSE;
 599                 for (target_class = tinfo->constraints; *target_class; ++target_class) {
 600                         MonoClass *tc;
 601                         MonoType *inflated = verifier_inflate_type (ctx, &(*target_class)->byval_arg, context);
 602                         if (!inflated)
 603                                 return FALSE;
 604                         tc = mono_class_from_mono_type (inflated);
 605                         mono_metadata_free_type (inflated);
 606
 607                         for (candidate_class = cinfo->constraints; *candidate_class; ++candidate_class) {
 608                                 MonoClass *cc;
 609                                 inflated = verifier_inflate_type (ctx, &(*candidate_class)->byval_arg, ctx->generic_context);
 610                                 if (!inflated)
 611                                         return FALSE;
 612                                 cc = mono_class_from_mono_type (inflated);
 613                                 mono_metadata_free_type (inflated);
 614
 615                                 if (mono_class_is_assignable_from (tc, cc))
 616                                         break;
 617                         }
 618                         if (!*candidate_class)
 619                                 return FALSE;
 620                 }
 621         }
 622         return TRUE;
 623 }
 624
 625 static MonoGenericParam*
 626 verifier_get_generic_param_from_type (VerifyContext *ctx, MonoType *type)
 627 {
 628         MonoGenericContainer *gc;
 629         MonoMethod *method = ctx->method;
 630         int num;
 631
 632         num = mono_type_get_generic_param_num (type);
 633
 634         if (type->type == MONO_TYPE_VAR) {
 635                 MonoClass *gtd = method->klass;
 636                 if (gtd->generic_class)
 637                         gtd = gtd->generic_class->container_class;
 638                 gc = gtd->generic_container;
 639         } else { //MVAR
 640                 MonoMethod *gmd = method;
 641                 if (method->is_inflated)
 642                         gmd = ((MonoMethodInflated*)method)->declaring;
 643                 gc = mono_method_get_generic_container (gmd);
 644         }
 645         if (!gc)
 646                 return FALSE;
 647         return mono_generic_container_get_param (gc, num);
 648 }
 649
 650
 651
 652 /*
 653  * Verify if @type is valid for the given @ctx verification context.
 654  * this function checks for VAR and MVAR types that are invalid under the current verifier,
 655  * This means that it either
 656  */
 657 static gboolean
 658 is_valid_type_in_context (VerifyContext *ctx, MonoType *type)
 659 {
 660         return mono_type_is_valid_type_in_context (type, ctx->generic_context);
 661 }
 662
 663 static gboolean
 664 is_valid_generic_instantiation_in_context (VerifyContext *ctx, MonoGenericInst *ginst)
 665 {
 666         int i;
 667         for (i = 0; i < ginst->type_argc; ++i) {
 668                 MonoType *type = ginst->type_argv [i];
 669                 if (!is_valid_type_in_context (ctx, type))
 670                         return FALSE;
 671         }
 672         return TRUE;
 673 }
 674
 675 static gboolean
 676 generic_arguments_respect_constraints (VerifyContext *ctx, MonoGenericContainer *gc, MonoGenericContext *context, MonoGenericInst *ginst)
 677 {
 678         int i;
 679         for (i = 0; i < ginst->type_argc; ++i) {
 680                 MonoType *type = ginst->type_argv [i];
 681                 MonoGenericParam *target = mono_generic_container_get_param (gc, i);
 682                 MonoGenericParam *candidate;
 683
 684                 if (!mono_type_is_generic_argument (type))
 685                         continue;
 686
 687                 if (!is_valid_type_in_context (ctx, type))
 688                         return FALSE;
 689
 690                 candidate = verifier_get_generic_param_from_type (ctx, type);
 691
 692                 if (!mono_generic_param_is_constraint_compatible (ctx, target, candidate, context))
 693                         return FALSE;
 694         }
 695         return TRUE;
 696 }
 697
 698 static gboolean
 699 mono_method_repect_method_constraints (VerifyContext *ctx, MonoMethod *method)
 700 {
 701         MonoMethodInflated *gmethod = (MonoMethodInflated *)method;
 702         MonoGenericInst *ginst = gmethod->context.method_inst;
 703         MonoGenericContainer *gc = mono_method_get_generic_container (gmethod->declaring);
 704         return !gc || generic_arguments_respect_constraints (ctx, gc, &gmethod->context, ginst);
 705 }
 706
 707 static gboolean
 708 mono_class_repect_method_constraints (VerifyContext *ctx, MonoClass *klass)
 709 {
 710         MonoGenericClass *gklass = klass->generic_class;
 711         MonoGenericInst *ginst = gklass->context.class_inst;
 712         MonoGenericContainer *gc = gklass->container_class->generic_container;
 713         return !gc || generic_arguments_respect_constraints (ctx, gc, &gklass->context, ginst);
 714 }
 715
 716 static gboolean
 717 mono_method_is_valid_generic_instantiation (VerifyContext *ctx, MonoMethod *method)
 718 {
 719         MonoMethodInflated *gmethod = (MonoMethodInflated *)method;
 720         MonoGenericInst *ginst = gmethod->context.method_inst;
 721         MonoGenericContainer *gc = mono_method_get_generic_container (gmethod->declaring);
 722         if (!gc) /*non-generic inflated method - it's part of a generic type  */
 723                 return TRUE;
 724         if (ctx && !is_valid_generic_instantiation_in_context (ctx, ginst))
 725                 return FALSE;
 726         return is_valid_generic_instantiation (gc, &gmethod->context, ginst);
 727
 728 }
 729
 730 static gboolean
 731 mono_class_is_valid_generic_instantiation (VerifyContext *ctx, MonoClass *klass)
 732 {
 733         MonoGenericClass *gklass = klass->generic_class;
 734         MonoGenericInst *ginst = gklass->context.class_inst;
 735         MonoGenericContainer *gc = gklass->container_class->generic_container;
 736         if (ctx && !is_valid_generic_instantiation_in_context (ctx, ginst))
 737                 return FALSE;
 738         return is_valid_generic_instantiation (gc, &gklass->context, ginst);
 739 }
 740
 741 static gboolean
 742 mono_type_is_valid_in_context (VerifyContext *ctx, MonoType *type)
 743 {
 744         MonoClass *klass;
 745
 746         if (type == NULL) {
 747                 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid null type at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
 748                 return FALSE;
 749         }
 750
 751         if (!is_valid_type_in_context (ctx, type)) {
 752                 char *str = mono_type_full_name (type);
 753                 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid generic type (%s%s) (argument out of range or %s is not generic) at 0x%04x",
 754                         type->type == MONO_TYPE_VAR ? "!" : "!!",
 755                         str,
 756                         type->type == MONO_TYPE_VAR ? "class" : "method",
 757                         ctx->ip_offset),
 758                         MONO_EXCEPTION_BAD_IMAGE);
 759                 g_free (str);
 760                 return FALSE;
 761         }
 762
 763         klass = mono_class_from_mono_type (type);
 764         mono_class_init (klass);
 765         if (mono_loader_get_last_error () || klass->exception_type != MONO_EXCEPTION_NONE) {
 766                 if (klass->generic_class && !mono_class_is_valid_generic_instantiation (NULL, klass))
 767                         ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid generic instantiation of type %s.%s at 0x%04x", klass->name_space, klass->name, ctx->ip_offset), MONO_EXCEPTION_TYPE_LOAD);
 768                 else
 769                         ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Could not load type %s.%s at 0x%04x", klass->name_space, klass->name, ctx->ip_offset), MONO_EXCEPTION_TYPE_LOAD);
 770                 return FALSE;
 771         }
 772
 773         if (klass->generic_class && klass->generic_class->container_class->exception_type != MONO_EXCEPTION_NONE) {
 774                 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Could not load type %s.%s at 0x%04x", klass->name_space, klass->name, ctx->ip_offset), MONO_EXCEPTION_TYPE_LOAD);
 775                 return FALSE;
 776         }
 777
 778         if (!klass->generic_class)
 779                 return TRUE;
 780
 781         if (!mono_class_is_valid_generic_instantiation (ctx, klass)) {
 782                 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid generic type instantiation of type %s.%s at 0x%04x", klass->name_space, klass->name, ctx->ip_offset), MONO_EXCEPTION_TYPE_LOAD);
 783                 return FALSE;
 784         }
 785
 786         if (!mono_class_repect_method_constraints (ctx, klass)) {
 787                 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid generic type instantiation of type %s.%s (generic args don't respect target's constraints) at 0x%04x", klass->name_space, klass->name, ctx->ip_offset), MONO_EXCEPTION_TYPE_LOAD);
 788                 return FALSE;
 789         }
 790
 791         return TRUE;
 792 }
 793
 794 static verify_result_t
 795 mono_method_is_valid_in_context (VerifyContext *ctx, MonoMethod *method)
 796 {
 797         if (!mono_type_is_valid_in_context (ctx, &method->klass->byval_arg))
 798                 return RESULT_INVALID;
 799
 800         if (!method->is_inflated)
 801                 return RESULT_VALID;
 802
 803         if (!mono_method_is_valid_generic_instantiation (ctx, method)) {
 804                 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid generic method instantiation of method %s.%s::%s at 0x%04x", method->klass->name_space, method->klass->name, method->name, ctx->ip_offset), MONO_EXCEPTION_UNVERIFIABLE_IL);
 805                 return RESULT_INVALID;
 806         }
 807
 808         if (!mono_method_repect_method_constraints (ctx, method)) {
 809                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid generic method instantiation of method %s.%s::%s (generic args don't respect target's constraints) at 0x%04x", method->klass->name_space, method->klass->name, method->name, ctx->ip_offset));
 810                 return RESULT_UNVERIFIABLE;
 811         }
 812         return RESULT_VALID;
 813 }
 814
 815
 816 static MonoClassField*
 817 verifier_load_field (VerifyContext *ctx, int token, MonoClass **out_klass, const char *opcode) {
 818         MonoClassField *field;
 819         MonoClass *klass = NULL;
 820
 821         if (!IS_FIELD_DEF_OR_REF (token) || !token_bounds_check (ctx->image, token)) {
 822                 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid field token 0x%08x for %s at 0x%04x", token, opcode, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
 823                 return NULL;
 824         }
 825
 826         field = mono_field_from_token (ctx->image, token, &klass, ctx->generic_context);
 827         if (!field || !field->parent || !klass) {
 828                 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Cannot load field from token 0x%08x for %s at 0x%04x", token, opcode, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
 829                 return NULL;
 830         }
 831
 832         if (!mono_type_is_valid_in_context (ctx, &klass->byval_arg))
 833                 return NULL;
 834
 835         *out_klass = klass;
 836         return field;
 837 }
 838
 839 static MonoMethod*
 840 verifier_load_method (VerifyContext *ctx, int token, const char *opcode) {
 841         MonoMethod* method;
 842
 843         if (!IS_METHOD_DEF_OR_REF_OR_SPEC (token) || !token_bounds_check (ctx->image, token)) {
 844                 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid method token 0x%08x for %s at 0x%04x", token, opcode, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
 845                 return NULL;
 846         }
 847
 848         method = mono_get_method_full (ctx->image, token, NULL, ctx->generic_context);
 849
 850         if (!method) {
 851                 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Cannot load method from token 0x%08x for %s at 0x%04x", token, opcode, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
 852                 return NULL;
 853         }
 854
 855         if (mono_method_is_valid_in_context (ctx, method) == RESULT_INVALID)
 856                 return NULL;
 857
 858         return method;
 859 }
 860
 861 static MonoType*
 862 verifier_load_type (VerifyContext *ctx, int token, const char *opcode) {
 863         MonoType* type;
 864
 865         if (!IS_TYPE_DEF_OR_REF_OR_SPEC (token) || !token_bounds_check (ctx->image, token)) {
 866                 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid type token 0x%08x at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
 867                 return NULL;
 868         }
 869
 870         type = mono_type_get_full (ctx->image, token, ctx->generic_context);
 871
 872         if (!type) {
 873                 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Cannot load type from token 0x%08x for %s at 0x%04x", token, opcode, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
 874                 return NULL;
 875         }
 876
 877         if (!mono_type_is_valid_in_context (ctx, type))
 878                 return NULL;
 879
 880         return type;
 881 }
 882
 883
 884 /* stack_slot_get_type:
 885  *
 886  * Returns the stack type of @value. This value includes POINTER_MASK.
 887  *
 888  * Use this function to checks that account for a managed pointer.
 889  */
 890 static gint32
 891 stack_slot_get_type (ILStackDesc *value)
 892 {
 893         return value->stype & RAW_TYPE_MASK;
 894 }
 895
 896 /* stack_slot_get_underlying_type:
 897  *
 898  * Returns the stack type of @value. This value does not include POINTER_MASK.
 899  *
 900  * Use this function is cases where the fact that the value could be a managed pointer is
 901  * irrelevant. For example, field load doesn't care about this fact of type on stack.
 902  */
 903 static gint32
 904 stack_slot_get_underlying_type (ILStackDesc *value)
 905 {
 906         return value->stype & TYPE_MASK;
 907 }
 908
 909 /* stack_slot_is_managed_pointer:
 910  *
 911  * Returns TRUE is @value is a managed pointer.
 912  */
 913 static gboolean
 914 stack_slot_is_managed_pointer (ILStackDesc *value)
 915 {
 916         return (value->stype & POINTER_MASK) == POINTER_MASK;
 917 }
 918
 919 /* stack_slot_is_managed_mutability_pointer:
 920  *
 921  * Returns TRUE is @value is a managed mutability pointer.
 922  */
 923 static G_GNUC_UNUSED gboolean
 924 stack_slot_is_managed_mutability_pointer (ILStackDesc *value)
 925 {
 926         return (value->stype & CMMP_MASK) == CMMP_MASK;
 927 }
 928
 929 /* stack_slot_is_null_literal:
 930  *
 931  * Returns TRUE is @value is the null literal.
 932  */
 933 static gboolean
 934 stack_slot_is_null_literal (ILStackDesc *value)
 935 {
 936         return (value->stype & NULL_LITERAL_MASK) == NULL_LITERAL_MASK;
 937 }
 938
 939
 940 /* stack_slot_is_this_pointer:
 941  *
 942  * Returns TRUE is @value is the this literal
 943  */
 944 static gboolean
 945 stack_slot_is_this_pointer (ILStackDesc *value)
 946 {
 947         return (value->stype & THIS_POINTER_MASK) == THIS_POINTER_MASK;
 948 }
 949
 950 /* stack_slot_is_boxed_value:
 951  *
 952  * Returns TRUE is @value is a boxed value
 953  */
 954 static gboolean
 955 stack_slot_is_boxed_value (ILStackDesc *value)
 956 {
 957         return (value->stype & BOXED_MASK) == BOXED_MASK;
 958 }
 959
 960 static const char *
 961 stack_slot_get_name (ILStackDesc *value)
 962 {
 963         return type_names [value->stype & TYPE_MASK];
 964 }
 965
 966 #define APPEND_WITH_PREDICATE(PRED,NAME) do {\
 967         if (PRED (value)) { \
 968                 if (!first) \
 969                         g_string_append (str, ", "); \
 970                 g_string_append (str, NAME); \
 971                 first = FALSE; \
 972         } } while (0)
 973
 974 static char*
 975 stack_slot_stack_type_full_name (ILStackDesc *value)
 976 {
 977         GString *str = g_string_new ("");
 978         char *result;
 979
 980         if ((value->stype & TYPE_MASK) != value->stype) {
 981                 gboolean first = TRUE;
 982                 g_string_append(str, "[");
 983                 APPEND_WITH_PREDICATE (stack_slot_is_this_pointer, "this");
 984                 APPEND_WITH_PREDICATE (stack_slot_is_boxed_value, "boxed");
 985                 APPEND_WITH_PREDICATE (stack_slot_is_null_literal, "null");
 986                 APPEND_WITH_PREDICATE (stack_slot_is_managed_mutability_pointer, "cmmp");
 987                 APPEND_WITH_PREDICATE (stack_slot_is_managed_pointer, "mp");
 988                 g_string_append(str, "] ");
 989         }
 990
 991         g_string_append (str, stack_slot_get_name (value));
 992         result = str->str;
 993         g_string_free (str, FALSE);
 994         return result;
 995 }
 996
 997 static char*
 998 stack_slot_full_name (ILStackDesc *value)
 999 {
1000         char *type_name = mono_type_full_name (value->type);
1001         char *stack_name = stack_slot_stack_type_full_name (value);
1002         char *res = g_strdup_printf ("%s (%s)", type_name, stack_name);
1003         g_free (type_name);
1004         g_free (stack_name);
1005         return res;
1006 }
1007
1008 //////////////////////////////////////////////////////////////////
1009 void
1010 mono_free_verify_list (GSList *list)
1011 {
1012         MonoVerifyInfoExtended *info;
1013         GSList *tmp;
1014
1015         for (tmp = list; tmp; tmp = tmp->next) {
1016                 info = tmp->data;
1017                 g_free (info->info.message);
1018                 g_free (info);
1019         }
1020         g_slist_free (list);
1021 }
1022
1023 #define ADD_ERROR(list,msg)     \
1024         do {    \
1025                 MonoVerifyInfoExtended *vinfo = g_new (MonoVerifyInfoExtended, 1);      \
1026                 vinfo->info.status = MONO_VERIFY_ERROR; \
1027                 vinfo->info.message = (msg);    \
1028                 (list) = g_slist_prepend ((list), vinfo);       \
1029         } while (0)
1030
1031 #define ADD_WARN(list,code,msg) \
1032         do {    \
1033                 MonoVerifyInfoExtended *vinfo = g_new (MonoVerifyInfoExtended, 1);      \
1034                 vinfo->info.status = (code);    \
1035                 vinfo->info.message = (msg);    \
1036                 (list) = g_slist_prepend ((list), vinfo);       \
1037         } while (0)
1038
1039 static const char
1040 valid_cultures[][9] = {
1041         "ar-SA", "ar-IQ", "ar-EG", "ar-LY",
1042         "ar-DZ", "ar-MA", "ar-TN", "ar-OM",
1043         "ar-YE", "ar-SY", "ar-JO", "ar-LB",
1044         "ar-KW", "ar-AE", "ar-BH", "ar-QA",
1045         "bg-BG", "ca-ES", "zh-TW", "zh-CN",
1046         "zh-HK", "zh-SG", "zh-MO", "cs-CZ",
1047         "da-DK", "de-DE", "de-CH", "de-AT",
1048         "de-LU", "de-LI", "el-GR", "en-US",
1049         "en-GB", "en-AU", "en-CA", "en-NZ",
1050         "en-IE", "en-ZA", "en-JM", "en-CB",
1051         "en-BZ", "en-TT", "en-ZW", "en-PH",
1052         "es-ES-Ts", "es-MX", "es-ES-Is", "es-GT",
1053         "es-CR", "es-PA", "es-DO", "es-VE",
1054         "es-CO", "es-PE", "es-AR", "es-EC",
1055         "es-CL", "es-UY", "es-PY", "es-BO",
1056         "es-SV", "es-HN", "es-NI", "es-PR",
1057         "Fi-FI", "fr-FR", "fr-BE", "fr-CA",
1058         "Fr-CH", "fr-LU", "fr-MC", "he-IL",
1059         "hu-HU", "is-IS", "it-IT", "it-CH",
1060         "Ja-JP", "ko-KR", "nl-NL", "nl-BE",
1061         "nb-NO", "nn-NO", "pl-PL", "pt-BR",
1062         "pt-PT", "ro-RO", "ru-RU", "hr-HR",
1063         "Lt-sr-SP", "Cy-sr-SP", "sk-SK", "sq-AL",
1064         "sv-SE", "sv-FI", "th-TH", "tr-TR",
1065         "ur-PK", "id-ID", "uk-UA", "be-BY",
1066         "sl-SI", "et-EE", "lv-LV", "lt-LT",
1067         "fa-IR", "vi-VN", "hy-AM", "Lt-az-AZ",
1068         "Cy-az-AZ",
1069         "eu-ES", "mk-MK", "af-ZA",
1070         "ka-GE", "fo-FO", "hi-IN", "ms-MY",
1071         "ms-BN", "kk-KZ", "ky-KZ", "sw-KE",
1072         "Lt-uz-UZ", "Cy-uz-UZ", "tt-TA", "pa-IN",
1073         "gu-IN", "ta-IN", "te-IN", "kn-IN",
1074         "mr-IN", "sa-IN", "mn-MN", "gl-ES",
1075         "kok-IN", "syr-SY", "div-MV"
1076 };
1077
1078 static int
1079 is_valid_culture (const char *cname)
1080 {
1081         int i;
1082         int found;
1083
1084         found = *cname == 0;
1085         for (i = 0; i < G_N_ELEMENTS (valid_cultures); ++i) {
1086                 if (g_ascii_strcasecmp (valid_cultures [i], cname)) {
1087                         found = 1;
1088                         break;
1089                 }
1090         }
1091         return found;
1092 }
1093
1094 static int
1095 is_valid_assembly_flags (guint32 flags) {
1096         /* Metadata: 22.1.2 */
1097         flags &= ~(0x8000 | 0x4000); /* ignore reserved bits 0x0030? */
1098         return ((flags == 1) || (flags == 0));
1099 }
1100
1101 static int
1102 is_valid_blob (MonoImage *image, guint32 blob_index, int notnull)
1103 {
1104         guint32 size;
1105         const char *p, *blob_end;
1106
1107         if (blob_index >= image->heap_blob.size)
1108                 return 0;
1109         p = mono_metadata_blob_heap (image, blob_index);
1110         size = mono_metadata_decode_blob_size (p, &blob_end);
1111         if (blob_index + size + (blob_end-p) > image->heap_blob.size)
1112                 return 0;
1113         if (notnull && !size)
1114                 return 0;
1115         return 1;
1116 }
1117
1118 static const char*
1119 is_valid_string (MonoImage *image, guint32 str_index, int notnull)
1120 {
1121         const char *p, *blob_end, *res;
1122
1123         if (str_index >= image->heap_strings.size)
1124                 return NULL;
1125         res = p = mono_metadata_string_heap (image, str_index);
1126         blob_end = mono_metadata_string_heap (image, image->heap_strings.size - 1);
1127         if (notnull && !*p)
1128                 return 0;
1129         /*
1130          * FIXME: should check it's a valid utf8 string, too.
1131          */
1132         while (p <= blob_end) {
1133                 if (!*p)
1134                         return res;
1135                 ++p;
1136         }
1137         return *p? NULL: res;
1138 }
1139
1140 static int
1141 is_valid_cls_ident (const char *p)
1142 {
1143         /*
1144          * FIXME: we need the full unicode glib support for this.
1145          * Check: http://www.unicode.org/unicode/reports/tr15/Identifier.java
1146          * We do the lame thing for now.
1147          */
1148         if (!isalpha (*p))
1149                 return 0;
1150         ++p;
1151         while (*p) {
1152                 if (!isalnum (*p) && *p != '_')
1153                         return 0;
1154                 ++p;
1155         }
1156         return 1;
1157 }
1158
1159 static int
1160 is_valid_filename (const char *p)
1161 {
1162         if (!*p)
1163                 return 0;
1164         return strpbrk (p, "\\//:")? 0: 1;
1165 }
1166
1167 static GSList*
1168 verify_assembly_table (MonoImage *image, GSList *list, int level)
1169 {
1170         MonoTableInfo *t = &image->tables [MONO_TABLE_ASSEMBLY];
1171         guint32 cols [MONO_ASSEMBLY_SIZE];
1172         const char *p;
1173
1174         if (level & MONO_VERIFY_ERROR) {
1175                 if (t->rows > 1)
1176                         ADD_ERROR (list, g_strdup ("Assembly table may only have 0 or 1 rows"));
1177                 mono_metadata_decode_row (t, 0, cols, MONO_ASSEMBLY_SIZE);
1178
1179                 switch (cols [MONO_ASSEMBLY_HASH_ALG]) {
1180                 case ASSEMBLY_HASH_NONE:
1181                 case ASSEMBLY_HASH_MD5:
1182                 case ASSEMBLY_HASH_SHA1:
1183                         break;
1184                 default:
1185                         ADD_ERROR (list, g_strdup_printf ("Hash algorithm 0x%x unknown", cols [MONO_ASSEMBLY_HASH_ALG]));
1186                 }
1187
1188                 if (!is_valid_assembly_flags (cols [MONO_ASSEMBLY_FLAGS]))
1189                         ADD_ERROR (list, g_strdup_printf ("Invalid flags in assembly: 0x%x", cols [MONO_ASSEMBLY_FLAGS]));
1190
1191                 if (!is_valid_blob (image, cols [MONO_ASSEMBLY_PUBLIC_KEY], FALSE))
1192                         ADD_ERROR (list, g_strdup ("Assembly public key is an invalid index"));
1193
1194                 if (!(p = is_valid_string (image, cols [MONO_ASSEMBLY_NAME], TRUE))) {
1195                         ADD_ERROR (list, g_strdup ("Assembly name is invalid"));
1196                 } else {
1197                         if (strpbrk (p, ":\\/."))
1198                                 ADD_ERROR (list, g_strdup_printf ("Assembly name `%s' contains invalid chars", p));
1199                 }
1200
1201                 if (!(p = is_valid_string (image, cols [MONO_ASSEMBLY_CULTURE], FALSE))) {
1202                         ADD_ERROR (list, g_strdup ("Assembly culture is an invalid index"));
1203                 } else {
1204                         if (!is_valid_culture (p))
1205                                 ADD_ERROR (list, g_strdup_printf ("Assembly culture `%s' is invalid", p));
1206                 }
1207         }
1208         return list;
1209 }
1210
1211 static GSList*
1212 verify_assemblyref_table (MonoImage *image, GSList *list, int level)
1213 {
1214         MonoTableInfo *t = &image->tables [MONO_TABLE_ASSEMBLYREF];
1215         guint32 cols [MONO_ASSEMBLYREF_SIZE];
1216         const char *p;
1217         int i;
1218
1219         if (level & MONO_VERIFY_ERROR) {
1220                 for (i = 0; i < t->rows; ++i) {
1221                         mono_metadata_decode_row (t, i, cols, MONO_ASSEMBLYREF_SIZE);
1222                         if (!is_valid_assembly_flags (cols [MONO_ASSEMBLYREF_FLAGS]))
1223                                 ADD_ERROR (list, g_strdup_printf ("Invalid flags in assemblyref row %d: 0x%x", i + 1, cols [MONO_ASSEMBLY_FLAGS]));
1224
1225                         if (!is_valid_blob (image, cols [MONO_ASSEMBLYREF_PUBLIC_KEY], FALSE))
1226                                 ADD_ERROR (list, g_strdup_printf ("AssemblyRef public key in row %d is an invalid index", i + 1));
1227
1228                         if (!(p = is_valid_string (image, cols [MONO_ASSEMBLYREF_CULTURE], FALSE))) {
1229                                 ADD_ERROR (list, g_strdup_printf ("AssemblyRef culture in row %d is invalid", i + 1));
1230                         } else {
1231                                 if (!is_valid_culture (p))
1232                                         ADD_ERROR (list, g_strdup_printf ("AssemblyRef culture `%s' in row %d is invalid", p, i + 1));
1233                         }
1234
1235                         if (cols [MONO_ASSEMBLYREF_HASH_VALUE] && !is_valid_blob (image, cols [MONO_ASSEMBLYREF_HASH_VALUE], TRUE))
1236                                 ADD_ERROR (list, g_strdup_printf ("AssemblyRef hash value in row %d is invalid or not null and empty", i + 1));
1237                 }
1238         }
1239         if (level & MONO_VERIFY_WARNING) {
1240                 /* check for duplicated rows */
1241                 for (i = 0; i < t->rows; ++i) {
1242                 }
1243         }
1244         return list;
1245 }
1246
1247 static GSList*
1248 verify_class_layout_table (MonoImage *image, GSList *list, int level)
1249 {
1250         MonoTableInfo *t = &image->tables [MONO_TABLE_CLASSLAYOUT];
1251         MonoTableInfo *tdef = &image->tables [MONO_TABLE_TYPEDEF];
1252         guint32 cols [MONO_CLASS_LAYOUT_SIZE];
1253         guint32 value, i;
1254
1255         if (level & MONO_VERIFY_ERROR) {
1256                 for (i = 0; i < t->rows; ++i) {
1257                         mono_metadata_decode_row (t, i, cols, MONO_CLASS_LAYOUT_SIZE);
1258
1259                         if (cols [MONO_CLASS_LAYOUT_PARENT] > tdef->rows || !cols [MONO_CLASS_LAYOUT_PARENT]) {
1260                                 ADD_ERROR (list, g_strdup_printf ("Parent in class layout is invalid in row %d", i + 1));
1261                         } else {
1262                                 value = mono_metadata_decode_row_col (tdef, cols [MONO_CLASS_LAYOUT_PARENT] - 1, MONO_TYPEDEF_FLAGS);
1263                                 if (value & TYPE_ATTRIBUTE_INTERFACE)
1264                                         ADD_ERROR (list, g_strdup_printf ("Parent in class layout row %d is an interface", i + 1));
1265                                 if (value & TYPE_ATTRIBUTE_AUTO_LAYOUT)
1266                                         ADD_ERROR (list, g_strdup_printf ("Parent in class layout row %d is AutoLayout", i + 1));
1267                                 if (value & TYPE_ATTRIBUTE_SEQUENTIAL_LAYOUT) {
1268                                         switch (cols [MONO_CLASS_LAYOUT_PACKING_SIZE]) {
1269                                         case 0: case 1: case 2: case 4: case 8: case 16:
1270                                         case 32: case 64: case 128: break;
1271                                         default:
1272                                                 ADD_ERROR (list, g_strdup_printf ("Packing size %d in class layout row %d is invalid", cols [MONO_CLASS_LAYOUT_PACKING_SIZE], i + 1));
1273                                         }
1274                                 } else if (value & TYPE_ATTRIBUTE_EXPLICIT_LAYOUT) {
1275                                         /*
1276                                          * FIXME: LAMESPEC: it claims it must be 0 (it's 1, instead).
1277                                         if (cols [MONO_CLASS_LAYOUT_PACKING_SIZE])
1278                                                 ADD_ERROR (list, g_strdup_printf ("Packing size %d in class layout row %d is invalid with explicit layout", cols [MONO_CLASS_LAYOUT_PACKING_SIZE], i + 1));
1279                                         */
1280                                 }
1281                                 /*
1282                                  * FIXME: we need to check that if class size != 0,
1283                                  * it needs to be greater than the class calculated size.
1284                                  * If parent is a valuetype it also needs to be smaller than
1285                                  * 1 MByte (0x100000 bytes).
1286                                  * To do both these checks we need to load the referenced
1287                                  * assemblies, though (the spec claims we didn't have to, bah).
1288                                  */
1289                                 /*
1290                                  * We need to check that the parent types have the same layout
1291                                  * type as well.
1292                                  */
1293                         }
1294                 }
1295         }
1296
1297         return list;
1298 }
1299
1300 static GSList*
1301 verify_constant_table (MonoImage *image, GSList *list, int level)
1302 {
1303         MonoTableInfo *t = &image->tables [MONO_TABLE_CONSTANT];
1304         guint32 cols [MONO_CONSTANT_SIZE];
1305         guint32 value, i;
1306         GHashTable *dups = g_hash_table_new (NULL, NULL);
1307
1308         for (i = 0; i < t->rows; ++i) {
1309                 mono_metadata_decode_row (t, i, cols, MONO_CONSTANT_SIZE);
1310
1311                 if (level & MONO_VERIFY_ERROR)
1312                         if (g_hash_table_lookup (dups, GUINT_TO_POINTER (cols [MONO_CONSTANT_PARENT])))
1313                                 ADD_ERROR (list, g_strdup_printf ("Parent 0x%08x is duplicated in Constant row %d", cols [MONO_CONSTANT_PARENT], i + 1));
1314                 g_hash_table_insert (dups, GUINT_TO_POINTER (cols [MONO_CONSTANT_PARENT]),
1315                                 GUINT_TO_POINTER (cols [MONO_CONSTANT_PARENT]));
1316
1317                 switch (cols [MONO_CONSTANT_TYPE]) {
1318                 case MONO_TYPE_U1: /* LAMESPEC: it says I1...*/
1319                 case MONO_TYPE_U2:
1320                 case MONO_TYPE_U4:
1321                 case MONO_TYPE_U8:
1322                         if (level & MONO_VERIFY_CLS)
1323                                 ADD_WARN (list, MONO_VERIFY_CLS, g_strdup_printf ("Type 0x%x not CLS compliant in Constant row %d", cols [MONO_CONSTANT_TYPE], i + 1));
1324                 case MONO_TYPE_BOOLEAN:
1325                 case MONO_TYPE_CHAR:
1326                 case MONO_TYPE_I1:
1327                 case MONO_TYPE_I2:
1328                 case MONO_TYPE_I4:
1329                 case MONO_TYPE_I8:
1330                 case MONO_TYPE_R4:
1331                 case MONO_TYPE_R8:
1332                 case MONO_TYPE_STRING:
1333                 case MONO_TYPE_CLASS:
1334                         break;
1335                 default:
1336                         if (level & MONO_VERIFY_ERROR)
1337                                 ADD_ERROR (list, g_strdup_printf ("Type 0x%x is invalid in Constant row %d", cols [MONO_CONSTANT_TYPE], i + 1));
1338                 }
1339                 if (level & MONO_VERIFY_ERROR) {
1340                         value = cols [MONO_CONSTANT_PARENT] >> MONO_HASCONSTANT_BITS;
1341                         switch (cols [MONO_CONSTANT_PARENT] & MONO_HASCONSTANT_MASK) {
1342                         case MONO_HASCONSTANT_FIEDDEF:
1343                                 if (value > image->tables [MONO_TABLE_FIELD].rows)
1344                                         ADD_ERROR (list, g_strdup_printf ("Parent (field) is invalid in Constant row %d", i + 1));
1345                                 break;
1346                         case MONO_HASCONSTANT_PARAM:
1347                                 if (value > image->tables [MONO_TABLE_PARAM].rows)
1348                                         ADD_ERROR (list, g_strdup_printf ("Parent (param) is invalid in Constant row %d", i + 1));
1349                                 break;
1350                         case MONO_HASCONSTANT_PROPERTY:
1351                                 if (value > image->tables [MONO_TABLE_PROPERTY].rows)
1352                                         ADD_ERROR (list, g_strdup_printf ("Parent (property) is invalid in Constant row %d", i + 1));
1353                                 break;
1354                         default:
1355                                 ADD_ERROR (list, g_strdup_printf ("Parent is invalid in Constant row %d", i + 1));
1356                                 break;
1357                         }
1358                 }
1359                 if (level & MONO_VERIFY_CLS) {
1360                         /*
1361                          * FIXME: verify types is consistent with the enum type
1362                          * is parent is an enum.
1363                          */
1364                 }
1365         }
1366         g_hash_table_destroy (dups);
1367         return list;
1368 }
1369
1370 static GSList*
1371 verify_event_map_table (MonoImage *image, GSList *list, int level)
1372 {
1373         MonoTableInfo *t = &image->tables [MONO_TABLE_EVENTMAP];
1374         guint32 cols [MONO_EVENT_MAP_SIZE];
1375         guint32 i, last_event;
1376         GHashTable *dups = g_hash_table_new (NULL, NULL);
1377
1378         last_event = 0;
1379
1380         for (i = 0; i < t->rows; ++i) {
1381                 mono_metadata_decode_row (t, i, cols, MONO_EVENT_MAP_SIZE);
1382                 if (level & MONO_VERIFY_ERROR)
1383                         if (g_hash_table_lookup (dups, GUINT_TO_POINTER (cols [MONO_EVENT_MAP_PARENT])))
1384                                 ADD_ERROR (list, g_strdup_printf ("Parent 0x%08x is duplicated in Event Map row %d", cols [MONO_EVENT_MAP_PARENT], i + 1));
1385                 g_hash_table_insert (dups, GUINT_TO_POINTER (cols [MONO_EVENT_MAP_PARENT]),
1386                                 GUINT_TO_POINTER (cols [MONO_EVENT_MAP_PARENT]));
1387                 if (level & MONO_VERIFY_ERROR) {
1388                         if (cols [MONO_EVENT_MAP_PARENT] > image->tables [MONO_TABLE_TYPEDEF].rows)
1389                                 ADD_ERROR (list, g_strdup_printf ("Parent 0x%08x is invalid in Event Map row %d", cols [MONO_EVENT_MAP_PARENT], i + 1));
1390                         if (cols [MONO_EVENT_MAP_EVENTLIST] > image->tables [MONO_TABLE_EVENT].rows)
1391                                 ADD_ERROR (list, g_strdup_printf ("EventList 0x%08x is invalid in Event Map row %d", cols [MONO_EVENT_MAP_EVENTLIST], i + 1));
1392
1393                         if (cols [MONO_EVENT_MAP_EVENTLIST] <= last_event)
1394                                 ADD_ERROR (list, g_strdup_printf ("EventList overlap in Event Map row %d", i + 1));
1395                         last_event = cols [MONO_EVENT_MAP_EVENTLIST];
1396                 }
1397         }
1398
1399         g_hash_table_destroy (dups);
1400         return list;
1401 }
1402
1403 static GSList*
1404 verify_event_table (MonoImage *image, GSList *list, int level)
1405 {
1406         MonoTableInfo *t = &image->tables [MONO_TABLE_EVENT];
1407         guint32 cols [MONO_EVENT_SIZE];
1408         const char *p;
1409         guint32 value, i;
1410
1411         for (i = 0; i < t->rows; ++i) {
1412                 mono_metadata_decode_row (t, i, cols, MONO_EVENT_SIZE);
1413
1414                 if (cols [MONO_EVENT_FLAGS] & ~(EVENT_SPECIALNAME|EVENT_RTSPECIALNAME)) {
1415                         if (level & MONO_VERIFY_ERROR)
1416                                 ADD_ERROR (list, g_strdup_printf ("Flags 0x%04x invalid in Event row %d", cols [MONO_EVENT_FLAGS], i + 1));
1417                 }
1418                 if (!(p = is_valid_string (image, cols [MONO_EVENT_NAME], TRUE))) {
1419                         if (level & MONO_VERIFY_ERROR)
1420                                 ADD_ERROR (list, g_strdup_printf ("Invalid name in Event row %d", i + 1));
1421                 } else {
1422                         if (level & MONO_VERIFY_CLS) {
1423                                 if (!is_valid_cls_ident (p))
1424                                         ADD_WARN (list, MONO_VERIFY_CLS, g_strdup_printf ("Invalid CLS name '%s` in Event row %d", p, i + 1));
1425                         }
1426                 }
1427
1428                 if (level & MONO_VERIFY_ERROR && cols [MONO_EVENT_TYPE]) {
1429                         value = cols [MONO_EVENT_TYPE] >> MONO_TYPEDEFORREF_BITS;
1430                         switch (cols [MONO_EVENT_TYPE] & MONO_TYPEDEFORREF_MASK) {
1431                         case MONO_TYPEDEFORREF_TYPEDEF:
1432                                 if (!value || value > image->tables [MONO_TABLE_TYPEDEF].rows)
1433                                         ADD_ERROR (list, g_strdup_printf ("Type invalid in Event row %d", i + 1));
1434                                 break;
1435                         case MONO_TYPEDEFORREF_TYPEREF:
1436                                 if (!value || value > image->tables [MONO_TABLE_TYPEREF].rows)
1437                                         ADD_ERROR (list, g_strdup_printf ("Type invalid in Event row %d", i + 1));
1438                                 break;
1439                         case MONO_TYPEDEFORREF_TYPESPEC:
1440                                 if (!value || value > image->tables [MONO_TABLE_TYPESPEC].rows)
1441                                         ADD_ERROR (list, g_strdup_printf ("Type invalid in Event row %d", i + 1));
1442                                 break;
1443                         default:
1444                                 ADD_ERROR (list, g_strdup_printf ("Type invalid in Event row %d", i + 1));
1445                         }
1446                 }
1447                 /*
1448                  * FIXME: check that there is 1 add and remove row in methodsemantics
1449                  * and 0 or 1 raise and 0 or more other (maybe it's better to check for
1450                  * these while checking methodsemantics).
1451                  * check for duplicated names for the same type [ERROR]
1452                  * check for CLS duplicate names for the same type [CLS]
1453                  */
1454         }
1455         return list;
1456 }
1457
1458 static GSList*
1459 verify_field_table (MonoImage *image, GSList *list, int level)
1460 {
1461         MonoTableInfo *t = &image->tables [MONO_TABLE_FIELD];
1462         guint32 cols [MONO_FIELD_SIZE];
1463         const char *p;
1464         guint32 i, flags;
1465
1466         for (i = 0; i < t->rows; ++i) {
1467                 mono_metadata_decode_row (t, i, cols, MONO_FIELD_SIZE);
1468                 /*
1469                  * Check this field has only one owner and that the owner is not
1470                  * an interface (done in verify_typedef_table() )
1471                  */
1472                 flags = cols [MONO_FIELD_FLAGS];
1473                 switch (flags & FIELD_ATTRIBUTE_FIELD_ACCESS_MASK) {
1474                 case FIELD_ATTRIBUTE_COMPILER_CONTROLLED:
1475                 case FIELD_ATTRIBUTE_PRIVATE:
1476                 case FIELD_ATTRIBUTE_FAM_AND_ASSEM:
1477                 case FIELD_ATTRIBUTE_ASSEMBLY:
1478                 case FIELD_ATTRIBUTE_FAMILY:
1479                 case FIELD_ATTRIBUTE_FAM_OR_ASSEM:
1480                 case FIELD_ATTRIBUTE_PUBLIC:
1481                         break;
1482                 default:
1483                         if (level & MONO_VERIFY_ERROR)
1484                                 ADD_ERROR (list, g_strdup_printf ("Invalid access mask in Field row %d", i + 1));
1485                         break;
1486                 }
1487                 if (level & MONO_VERIFY_ERROR) {
1488                         if ((flags & FIELD_ATTRIBUTE_LITERAL) && (flags & FIELD_ATTRIBUTE_INIT_ONLY))
1489                                 ADD_ERROR (list, g_strdup_printf ("Literal and InitOnly cannot be both set in Field row %d", i + 1));
1490                         if ((flags & FIELD_ATTRIBUTE_LITERAL) && !(flags & FIELD_ATTRIBUTE_STATIC))
1491                                 ADD_ERROR (list, g_strdup_printf ("Literal needs also Static set in Field row %d", i + 1));
1492                         if ((flags & FIELD_ATTRIBUTE_RT_SPECIAL_NAME) && !(flags & FIELD_ATTRIBUTE_SPECIAL_NAME))
1493                                 ADD_ERROR (list, g_strdup_printf ("RTSpecialName needs also SpecialName set in Field row %d", i + 1));
1494                         /*
1495                          * FIXME: check there is only one owner in the respective table.
1496                          * if (flags & FIELD_ATTRIBUTE_HAS_FIELD_MARSHAL)
1497                          * if (flags & FIELD_ATTRIBUTE_HAS_DEFAULT)
1498                          * if (flags & FIELD_ATTRIBUTE_HAS_FIELD_RVA)
1499                          */
1500                 }
1501                 if (!(p = is_valid_string (image, cols [MONO_FIELD_NAME], TRUE))) {
1502                         if (level & MONO_VERIFY_ERROR)
1503                                 ADD_ERROR (list, g_strdup_printf ("Invalid name in Field row %d", i + 1));
1504                 } else {
1505                         if (level & MONO_VERIFY_CLS) {
1506                                 if (!is_valid_cls_ident (p))
1507                                         ADD_WARN (list, MONO_VERIFY_CLS, g_strdup_printf ("Invalid CLS name '%s` in Field row %d", p, i + 1));
1508                         }
1509                 }
1510                 /*
1511                  * check signature.
1512                  * if owner is module needs to be static, access mask needs to be compilercontrolled,
1513                  * public or private (not allowed in cls mode).
1514                  * if owner is an enum ...
1515                  */
1516
1517
1518         }
1519         return list;
1520 }
1521
1522 static GSList*
1523 verify_file_table (MonoImage *image, GSList *list, int level)
1524 {
1525         MonoTableInfo *t = &image->tables [MONO_TABLE_FILE];
1526         guint32 cols [MONO_FILE_SIZE];
1527         const char *p;
1528         guint32 i;
1529         GHashTable *dups = g_hash_table_new (g_str_hash, g_str_equal);
1530
1531         for (i = 0; i < t->rows; ++i) {
1532                 mono_metadata_decode_row (t, i, cols, MONO_FILE_SIZE);
1533                 if (level & MONO_VERIFY_ERROR) {
1534                         if (cols [MONO_FILE_FLAGS] != FILE_CONTAINS_METADATA && cols [MONO_FILE_FLAGS] != FILE_CONTAINS_NO_METADATA)
1535                                 ADD_ERROR (list, g_strdup_printf ("Invalid flags in File row %d", i + 1));
1536                         if (!is_valid_blob (image, cols [MONO_FILE_HASH_VALUE], TRUE))
1537                                 ADD_ERROR (list, g_strdup_printf ("File hash value in row %d is invalid or not null and empty", i + 1));
1538                 }
1539                 if (!(p = is_valid_string (image, cols [MONO_FILE_NAME], TRUE))) {
1540                         if (level & MONO_VERIFY_ERROR)
1541                                 ADD_ERROR (list, g_strdup_printf ("Invalid name in File row %d", i + 1));
1542                 } else {
1543                         if (level & MONO_VERIFY_ERROR) {
1544                                 if (!is_valid_filename (p))
1545                                         ADD_ERROR (list, g_strdup_printf ("Invalid name '%s` in File row %d", p, i + 1));
1546                                 else if (g_hash_table_lookup (dups, p)) {
1547                                         ADD_ERROR (list, g_strdup_printf ("Duplicate name '%s` in File row %d", p, i + 1));
1548                                 }
1549                                 g_hash_table_insert (dups, (gpointer)p, (gpointer)p);
1550                         }
1551                 }
1552                 /*
1553                  * FIXME: I don't understand what this means:
1554                  * If this module contains a row in the Assembly table (that is, if this module "holds the manifest")
1555                  * then there shall not be any row in the File table for this module - i.e., no self-reference  [ERROR]
1556                  */
1557
1558         }
1559         if (level & MONO_VERIFY_WARNING) {
1560                 if (!t->rows && image->tables [MONO_TABLE_EXPORTEDTYPE].rows)
1561                         ADD_WARN (list, MONO_VERIFY_WARNING, g_strdup ("ExportedType table should be empty if File table is empty"));
1562         }
1563         g_hash_table_destroy (dups);
1564         return list;
1565 }
1566
1567 static GSList*
1568 verify_moduleref_table (MonoImage *image, GSList *list, int level)
1569 {
1570         MonoTableInfo *t = &image->tables [MONO_TABLE_MODULEREF];
1571         MonoTableInfo *tfile = &image->tables [MONO_TABLE_FILE];
1572         guint32 cols [MONO_MODULEREF_SIZE];
1573         const char *p, *pf;
1574         guint32 found, i, j, value;
1575         GHashTable *dups = g_hash_table_new (g_str_hash, g_str_equal);
1576
1577         for (i = 0; i < t->rows; ++i) {
1578                 mono_metadata_decode_row (t, i, cols, MONO_MODULEREF_SIZE);
1579                 if (!(p = is_valid_string (image, cols [MONO_MODULEREF_NAME], TRUE))) {
1580                         if (level & MONO_VERIFY_ERROR)
1581                                 ADD_ERROR (list, g_strdup_printf ("Invalid name in ModuleRef row %d", i + 1));
1582                 } else {
1583                         if (level & MONO_VERIFY_ERROR) {
1584                                 if (!is_valid_filename (p))
1585                                         ADD_ERROR (list, g_strdup_printf ("Invalid name '%s` in ModuleRef row %d", p, i + 1));
1586                                 else if (g_hash_table_lookup (dups, p)) {
1587                                         ADD_WARN (list, MONO_VERIFY_WARNING, g_strdup_printf ("Duplicate name '%s` in ModuleRef row %d", p, i + 1));
1588                                         g_hash_table_insert (dups, (gpointer)p, (gpointer)p);
1589                                         found = 0;
1590                                         for (j = 0; j < tfile->rows; ++j) {
1591                                                 value = mono_metadata_decode_row_col (tfile, j, MONO_FILE_NAME);
1592                                                 if ((pf = is_valid_string (image, value, TRUE)))
1593                                                         if (strcmp (p, pf) == 0) {
1594                                                                 found = 1;
1595                                                                 break;
1596                                                         }
1597                                         }
1598                                         if (!found)
1599                                                 ADD_ERROR (list, g_strdup_printf ("Name '%s` in ModuleRef row %d doesn't have a match in File table", p, i + 1));
1600                                 }
1601                         }
1602                 }
1603         }
1604         g_hash_table_destroy (dups);
1605         return list;
1606 }
1607
1608 static GSList*
1609 verify_standalonesig_table (MonoImage *image, GSList *list, int level)
1610 {
1611         MonoTableInfo *t = &image->tables [MONO_TABLE_STANDALONESIG];
1612         guint32 cols [MONO_STAND_ALONE_SIGNATURE_SIZE];
1613         const char *p;
1614         guint32 i;
1615
1616         for (i = 0; i < t->rows; ++i) {
1617                 mono_metadata_decode_row (t, i, cols, MONO_STAND_ALONE_SIGNATURE_SIZE);
1618                 if (level & MONO_VERIFY_ERROR) {
1619                         if (!is_valid_blob (image, cols [MONO_STAND_ALONE_SIGNATURE], TRUE)) {
1620                                 ADD_ERROR (list, g_strdup_printf ("Signature is invalid in StandAloneSig row %d", i + 1));
1621                         } else {
1622                                 p = mono_metadata_blob_heap (image, cols [MONO_STAND_ALONE_SIGNATURE]);
1623                                 /* FIXME: check it's a valid locals or method sig.*/
1624                         }
1625                 }
1626         }
1627         return list;
1628 }
1629
1630 GSList*
1631 mono_image_verify_tables (MonoImage *image, int level)
1632 {
1633         GSList *error_list = NULL;
1634
1635         error_list = verify_assembly_table (image, error_list, level);
1636         /*
1637          * AssemblyOS, AssemblyProcessor, AssemblyRefOs and
1638          * AssemblyRefProcessor should be ignored,
1639          * though we may want to emit a warning, since it should not
1640          * be present in a PE file.
1641          */
1642         error_list = verify_assemblyref_table (image, error_list, level);
1643         error_list = verify_class_layout_table (image, error_list, level);
1644         error_list = verify_constant_table (image, error_list, level);
1645         /*
1646          * cutom attribute, declsecurity
1647          */
1648         error_list = verify_event_map_table (image, error_list, level);
1649         error_list = verify_event_table (image, error_list, level);
1650         error_list = verify_field_table (image, error_list, level);
1651         error_list = verify_file_table (image, error_list, level);
1652         error_list = verify_moduleref_table (image, error_list, level);
1653         error_list = verify_standalonesig_table (image, error_list, level);
1654
1655         return g_slist_reverse (error_list);
1656 }
1657
1658 #define ADD_INVALID(list,msg)   \
1659         do {    \
1660                 MonoVerifyInfoExtended *vinfo = g_new (MonoVerifyInfoExtended, 1);      \
1661                 vinfo->status = MONO_VERIFY_ERROR;      \
1662                 vinfo->message = (msg); \
1663                 (list) = g_slist_prepend ((list), vinfo);       \
1664                 /*G_BREAKPOINT ();*/    \
1665                 goto invalid_cil;       \
1666         } while (0)
1667
1668 #define CHECK_STACK_UNDERFLOW(num)      \
1669         do {    \
1670                 if (cur_stack < (num))  \
1671                         ADD_INVALID (list, g_strdup_printf ("Stack underflow at 0x%04x (%d items instead of %d)", ip_offset, cur_stack, (num)));        \
1672         } while (0)
1673
1674 #define CHECK_STACK_OVERFLOW()  \
1675         do {    \
1676                 if (cur_stack >= max_stack)     \
1677                         ADD_INVALID (list, g_strdup_printf ("Maxstack exceeded at 0x%04x", ip_offset)); \
1678         } while (0)
1679
1680
1681 static int
1682 in_any_block (MonoMethodHeader *header, guint offset)
1683 {
1684         int i;
1685         MonoExceptionClause *clause;
1686
1687         for (i = 0; i < header->num_clauses; ++i) {
1688                 clause = &header->clauses [i];
1689                 if (MONO_OFFSET_IN_CLAUSE (clause, offset))
1690                         return 1;
1691                 if (MONO_OFFSET_IN_HANDLER (clause, offset))
1692                         return 1;
1693                 if (MONO_OFFSET_IN_FILTER (clause, offset))
1694                         return 1;
1695         }
1696         return 0;
1697 }
1698
1699 /*
1700  * in_any_exception_block:
1701  *
1702  * Returns TRUE is @offset is part of any exception clause (filter, handler, catch, finally or fault).
1703  */
1704 static gboolean
1705 in_any_exception_block (MonoMethodHeader *header, guint offset)
1706 {
1707         int i;
1708         MonoExceptionClause *clause;
1709
1710         for (i = 0; i < header->num_clauses; ++i) {
1711                 clause = &header->clauses [i];
1712                 if (MONO_OFFSET_IN_HANDLER (clause, offset))
1713                         return TRUE;
1714                 if (MONO_OFFSET_IN_FILTER (clause, offset))
1715                         return TRUE;
1716         }
1717         return FALSE;
1718 }
1719
1720 /*
1721  * is_valid_branch_instruction:
1722  *
1723  * Verify if it's valid to perform a branch from @offset to @target.
1724  * This should be used with br and brtrue/false.
1725  * It returns 0 if valid, 1 for unverifiable and 2 for invalid.
1726  * The major diferent from other similiar functions is that branching into a
1727  * finally/fault block is invalid instead of just unverifiable.
1728  */
1729 static int
1730 is_valid_branch_instruction (MonoMethodHeader *header, guint offset, guint target)
1731 {
1732         int i;
1733         MonoExceptionClause *clause;
1734
1735         for (i = 0; i < header->num_clauses; ++i) {
1736                 clause = &header->clauses [i];
1737                 /*branching into a finally block is invalid*/
1738                 if ((clause->flags == MONO_EXCEPTION_CLAUSE_FINALLY || clause->flags == MONO_EXCEPTION_CLAUSE_FAULT) &&
1739                         !MONO_OFFSET_IN_HANDLER (clause, offset) &&
1740                         MONO_OFFSET_IN_HANDLER (clause, target))
1741                         return 2;
1742
1743                 if (clause->try_offset != target && (MONO_OFFSET_IN_CLAUSE (clause, offset) ^ MONO_OFFSET_IN_CLAUSE (clause, target)))
1744                         return 1;
1745                 if (MONO_OFFSET_IN_HANDLER (clause, offset) ^ MONO_OFFSET_IN_HANDLER (clause, target))
1746                         return 1;
1747                 if (MONO_OFFSET_IN_FILTER (clause, offset) ^ MONO_OFFSET_IN_FILTER (clause, target))
1748                         return 1;
1749         }
1750         return 0;
1751 }
1752
1753 /*
1754  * is_valid_cmp_branch_instruction:
1755  *
1756  * Verify if it's valid to perform a branch from @offset to @target.
1757  * This should be used with binary comparison branching instruction, like beq, bge and similars.
1758  * It returns 0 if valid, 1 for unverifiable and 2 for invalid.
1759  *
1760  * The major diferences from other similar functions are that most errors lead to invalid
1761  * code and only branching out of finally, filter or fault clauses is unverifiable.
1762  */
1763 static int
1764 is_valid_cmp_branch_instruction (MonoMethodHeader *header, guint offset, guint target)
1765 {
1766         int i;
1767         MonoExceptionClause *clause;
1768
1769         for (i = 0; i < header->num_clauses; ++i) {
1770                 clause = &header->clauses [i];
1771                 /*branching out of a handler or finally*/
1772                 if (clause->flags != MONO_EXCEPTION_CLAUSE_NONE &&
1773                         MONO_OFFSET_IN_HANDLER (clause, offset) &&
1774                         !MONO_OFFSET_IN_HANDLER (clause, target))
1775                         return 1;
1776
1777                 if (clause->try_offset != target && (MONO_OFFSET_IN_CLAUSE (clause, offset) ^ MONO_OFFSET_IN_CLAUSE (clause, target)))
1778                         return 2;
1779                 if (MONO_OFFSET_IN_HANDLER (clause, offset) ^ MONO_OFFSET_IN_HANDLER (clause, target))
1780                         return 2;
1781                 if (MONO_OFFSET_IN_FILTER (clause, offset) ^ MONO_OFFSET_IN_FILTER (clause, target))
1782                         return 2;
1783         }
1784         return 0;
1785 }
1786
1787 /*
1788  * A leave can't escape a finally block
1789  */
1790 static int
1791 is_correct_leave (MonoMethodHeader *header, guint offset, guint target)
1792 {
1793         int i;
1794         MonoExceptionClause *clause;
1795
1796         for (i = 0; i < header->num_clauses; ++i) {
1797                 clause = &header->clauses [i];
1798                 if (clause->flags == MONO_EXCEPTION_CLAUSE_FINALLY && MONO_OFFSET_IN_HANDLER (clause, offset) && !MONO_OFFSET_IN_HANDLER (clause, target))
1799                         return 0;
1800                 if (MONO_OFFSET_IN_FILTER (clause, offset))
1801                         return 0;
1802         }
1803         return 1;
1804 }
1805
1806 /*
1807  * A rethrow can't happen outside of a catch handler.
1808  */
1809 static int
1810 is_correct_rethrow (MonoMethodHeader *header, guint offset)
1811 {
1812         int i;
1813         MonoExceptionClause *clause;
1814
1815         for (i = 0; i < header->num_clauses; ++i) {
1816                 clause = &header->clauses [i];
1817                 if (MONO_OFFSET_IN_HANDLER (clause, offset))
1818                         return 1;
1819                 if (MONO_OFFSET_IN_FILTER (clause, offset))
1820                         return 1;
1821         }
1822         return 0;
1823 }
1824
1825 /*
1826  * An endfinally can't happen outside of a finally/fault handler.
1827  */
1828 static int
1829 is_correct_endfinally (MonoMethodHeader *header, guint offset)
1830 {
1831         int i;
1832         MonoExceptionClause *clause;
1833
1834         for (i = 0; i < header->num_clauses; ++i) {
1835                 clause = &header->clauses [i];
1836                 if (MONO_OFFSET_IN_HANDLER (clause, offset) && (clause->flags == MONO_EXCEPTION_CLAUSE_FAULT || clause->flags == MONO_EXCEPTION_CLAUSE_FINALLY))
1837                         return 1;
1838         }
1839         return 0;
1840 }
1841
1842
1843 /*
1844  * An endfilter can only happens inside a filter clause.
1845  * In non-strict mode filter is allowed inside the handler clause too
1846  */
1847 static MonoExceptionClause *
1848 is_correct_endfilter (VerifyContext *ctx, guint offset)
1849 {
1850         int i;
1851         MonoExceptionClause *clause;
1852
1853         for (i = 0; i < ctx->header->num_clauses; ++i) {
1854                 clause = &ctx->header->clauses [i];
1855                 if (clause->flags != MONO_EXCEPTION_CLAUSE_FILTER)
1856                         continue;
1857                 if (MONO_OFFSET_IN_FILTER (clause, offset))
1858                         return clause;
1859                 if (!IS_STRICT_MODE (ctx) && MONO_OFFSET_IN_HANDLER (clause, offset))
1860                         return clause;
1861         }
1862         return NULL;
1863 }
1864
1865
1866 /*
1867  * Non-strict endfilter can happens inside a try block or any handler block
1868  */
1869 static int
1870 is_unverifiable_endfilter (VerifyContext *ctx, guint offset)
1871 {
1872         int i;
1873         MonoExceptionClause *clause;
1874
1875         for (i = 0; i < ctx->header->num_clauses; ++i) {
1876                 clause = &ctx->header->clauses [i];
1877                 if (MONO_OFFSET_IN_CLAUSE (clause, offset))
1878                         return 1;
1879         }
1880         return 0;
1881 }
1882
1883 static gboolean
1884 is_valid_bool_arg (ILStackDesc *arg)
1885 {
1886         if (stack_slot_is_managed_pointer (arg) || stack_slot_is_boxed_value (arg) || stack_slot_is_null_literal (arg))
1887                 return TRUE;
1888
1889
1890         switch (stack_slot_get_underlying_type (arg)) {
1891         case TYPE_I4:
1892         case TYPE_I8:
1893         case TYPE_NATIVE_INT:
1894         case TYPE_PTR:
1895                 return TRUE;
1896         case TYPE_COMPLEX:
1897                 g_assert (arg->type);
1898                 switch (arg->type->type) {
1899                 case MONO_TYPE_CLASS:
1900                 case MONO_TYPE_STRING:
1901                 case MONO_TYPE_OBJECT:
1902                 case MONO_TYPE_SZARRAY:
1903                 case MONO_TYPE_ARRAY:
1904                 case MONO_TYPE_FNPTR:
1905                 case MONO_TYPE_PTR:
1906                         return TRUE;
1907                 case MONO_TYPE_GENERICINST:
1908                         /*We need to check if the container class
1909                          * of the generic type is a valuetype, iow:
1910                          * is it a "class Foo<T>" or a "struct Foo<T>"?
1911                          */
1912                         return !arg->type->data.generic_class->container_class->valuetype;
1913                 }
1914         default:
1915                 return FALSE;
1916         }
1917 }
1918
1919
1920 /*Type manipulation helper*/
1921
1922 /*Returns the byref version of the supplied MonoType*/
1923 static MonoType*
1924 mono_type_get_type_byref (MonoType *type)
1925 {
1926         if (type->byref)
1927                 return type;
1928         return &mono_class_from_mono_type (type)->this_arg;
1929 }
1930
1931
1932 /*Returns the byval version of the supplied MonoType*/
1933 static MonoType*
1934 mono_type_get_type_byval (MonoType *type)
1935 {
1936         if (!type->byref)
1937                 return type;
1938         return &mono_class_from_mono_type (type)->byval_arg;
1939 }
1940
1941 static MonoType*
1942 mono_type_from_stack_slot (ILStackDesc *slot)
1943 {
1944         if (stack_slot_is_managed_pointer (slot))
1945                 return mono_type_get_type_byref (slot->type);
1946         return slot->type;
1947 }
1948
1949 /*Stack manipulation code*/
1950
1951 static void
1952 stack_init (VerifyContext *ctx, ILCodeDesc *state)
1953 {
1954         if (state->flags & IL_CODE_FLAG_STACK_INITED)
1955                 return;
1956         state->size = 0;
1957         state->flags |= IL_CODE_FLAG_STACK_INITED;
1958         if (!state->stack)
1959                 state->stack = g_new0 (ILStackDesc, ctx->max_stack);
1960 }
1961
1962 static void
1963 stack_copy (ILCodeDesc *to, ILCodeDesc *from)
1964 {
1965         to->size = from->size;
1966         memcpy (to->stack, from->stack, sizeof (ILStackDesc) * from->size);
1967 }
1968
1969 static void
1970 copy_stack_value (ILStackDesc *to, ILStackDesc *from)
1971 {
1972         to->stype = from->stype;
1973         to->type = from->type;
1974         to->method = from->method;
1975 }
1976
1977 static int
1978 check_underflow (VerifyContext *ctx, int size)
1979 {
1980         if (ctx->eval.size < size) {
1981                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Stack underflow, required %d, but have %d at 0x%04x", size, ctx->eval.size, ctx->ip_offset));
1982                 return 0;
1983         }
1984         return 1;
1985 }
1986
1987 static int
1988 check_overflow (VerifyContext *ctx)
1989 {
1990         if (ctx->eval.size >= ctx->max_stack) {
1991                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method doesn't have stack-depth %d at 0x%04x", ctx->eval.size + 1, ctx->ip_offset));
1992                 return 0;
1993         }
1994         return 1;
1995 }
1996
1997 /*This reject out PTR, FNPTR and TYPEDBYREF*/
1998 static gboolean
1999 check_unmanaged_pointer (VerifyContext *ctx, ILStackDesc *value)
2000 {
2001         if (stack_slot_get_type (value) == TYPE_PTR) {
2002                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Unmanaged pointer is not a verifiable type at 0x%04x", ctx->ip_offset));
2003                 return 0;
2004         }
2005         return 1;
2006 }
2007
2008 /*TODO verify if MONO_TYPE_TYPEDBYREF is not allowed here as well.*/
2009 static gboolean
2010 check_unverifiable_type (VerifyContext *ctx, MonoType *type)
2011 {
2012         if (type->type == MONO_TYPE_PTR || type->type == MONO_TYPE_FNPTR) {
2013                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Unmanaged pointer is not a verifiable type at 0x%04x", ctx->ip_offset));
2014                 return 0;
2015         }
2016         return 1;
2017 }
2018
2019
2020 static ILStackDesc *
2021 stack_push (VerifyContext *ctx)
2022 {
2023         return & ctx->eval.stack [ctx->eval.size++];
2024 }
2025
2026 static ILStackDesc *
2027 stack_push_val (VerifyContext *ctx, int stype, MonoType *type)
2028 {
2029         ILStackDesc *top = stack_push (ctx);
2030         top->stype = stype;
2031         top->type = type;
2032         return top;
2033 }
2034
2035 static ILStackDesc *
2036 stack_pop (VerifyContext *ctx)
2037 {
2038         ILStackDesc *ret = ctx->eval.stack + --ctx->eval.size;
2039         if ((ret->stype & UNINIT_THIS_MASK) == UNINIT_THIS_MASK)
2040                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Found use of uninitialized 'this ptr' ref at 0x%04x", ctx->ip_offset));
2041         return ret;
2042 }
2043
2044 /* This function allows to safely pop an unititialized this ptr from
2045  * the eval stack without marking the method as unverifiable.
2046  */
2047 static ILStackDesc *
2048 stack_pop_safe (VerifyContext *ctx)
2049 {
2050         return ctx->eval.stack + --ctx->eval.size;
2051 }
2052
2053 static ILStackDesc *
2054 stack_push_stack_val (VerifyContext *ctx, ILStackDesc *value)
2055 {
2056         ILStackDesc *top = stack_push (ctx);
2057         copy_stack_value (top, value);
2058         return top;
2059 }
2060
2061 /* Returns the MonoType associated with the token, or NULL if it is invalid.
2062  *
2063  * A boxable type can be either a reference or value type, but cannot be a byref type or an unmanaged pointer
2064  * */
2065 static MonoType*
2066 get_boxable_mono_type (VerifyContext* ctx, int token, const char *opcode)
2067 {
2068         MonoType *type;
2069         MonoClass *class;
2070
2071         if (!(type = verifier_load_type (ctx, token, opcode)))
2072                 return NULL;
2073
2074         if (type->byref && type->type != MONO_TYPE_TYPEDBYREF) {
2075                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid use of byref type for %s at 0x%04x", opcode, ctx->ip_offset));
2076                 return NULL;
2077         }
2078
2079         if (type->type == MONO_TYPE_VOID) {
2080                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid use of void type for %s at 0x%04x", opcode, ctx->ip_offset));
2081                 return NULL;
2082         }
2083
2084         if (type->type == MONO_TYPE_TYPEDBYREF)
2085                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid use of typedbyref for %s at 0x%04x", opcode, ctx->ip_offset));
2086
2087         if (!(class = mono_class_from_mono_type (type)))
2088                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Could not retrieve type token for %s at 0x%04x", opcode, ctx->ip_offset));
2089
2090         if (class->generic_container && type->type != MONO_TYPE_GENERICINST)
2091                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use the generic type definition in a boxable type position for %s at 0x%04x", opcode, ctx->ip_offset));
2092
2093         check_unverifiable_type (ctx, type);
2094         return type;
2095 }
2096
2097
2098 /*operation result tables */
2099
2100 static const unsigned char bin_op_table [TYPE_MAX][TYPE_MAX] = {
2101         {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
2102         {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2103         {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
2104         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_R8, TYPE_INV, TYPE_INV},
2105         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2106         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2107 };
2108
2109 static const unsigned char add_table [TYPE_MAX][TYPE_MAX] = {
2110         {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV},
2111         {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2112         {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV},
2113         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_R8, TYPE_INV, TYPE_INV},
2114         {TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_INV, TYPE_INV},
2115         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2116 };
2117
2118 static const unsigned char sub_table [TYPE_MAX][TYPE_MAX] = {
2119         {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
2120         {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2121         {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
2122         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_R8, TYPE_INV, TYPE_INV},
2123         {TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_NATIVE_INT | NON_VERIFIABLE_RESULT, TYPE_INV},
2124         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2125 };
2126
2127 static const unsigned char int_bin_op_table [TYPE_MAX][TYPE_MAX] = {
2128         {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
2129         {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2130         {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
2131         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2132         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2133         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2134 };
2135
2136 static const unsigned char shift_op_table [TYPE_MAX][TYPE_MAX] = {
2137         {TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV},
2138         {TYPE_I8, TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV},
2139         {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
2140         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2141         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2142         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2143 };
2144
2145 static const unsigned char cmp_br_op [TYPE_MAX][TYPE_MAX] = {
2146         {TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV},
2147         {TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2148         {TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV},
2149         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV},
2150         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_I4, TYPE_INV},
2151         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2152 };
2153
2154 static const unsigned char cmp_br_eq_op [TYPE_MAX][TYPE_MAX] = {
2155         {TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV},
2156         {TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2157         {TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_I4 | NON_VERIFIABLE_RESULT, TYPE_INV},
2158         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV},
2159         {TYPE_INV, TYPE_INV, TYPE_I4 | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_I4, TYPE_INV},
2160         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_I4},
2161 };
2162
2163 static const unsigned char add_ovf_un_table [TYPE_MAX][TYPE_MAX] = {
2164         {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV},
2165         {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2166         {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV},
2167         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2168         {TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_INV, TYPE_INV},
2169         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2170 };
2171
2172 static const unsigned char sub_ovf_un_table [TYPE_MAX][TYPE_MAX] = {
2173         {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
2174         {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2175         {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
2176         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2177         {TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_NATIVE_INT | NON_VERIFIABLE_RESULT, TYPE_INV},
2178         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2179 };
2180
2181 static const unsigned char bin_ovf_table [TYPE_MAX][TYPE_MAX] = {
2182         {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
2183         {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2184         {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
2185         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2186         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2187         {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
2188 };
2189
2190 #ifdef MONO_VERIFIER_DEBUG
2191
2192 /*debug helpers */
2193 static void
2194 dump_stack_value (ILStackDesc *value)
2195 {
2196         printf ("[(%x)(%x)", value->type->type, value->stype);
2197
2198         if (stack_slot_is_this_pointer (value))
2199                 printf ("[this] ");
2200
2201         if (stack_slot_is_boxed_value (value))
2202                 printf ("[boxed] ");
2203
2204         if (stack_slot_is_null_literal (value))
2205                 printf ("[null] ");
2206
2207         if (stack_slot_is_managed_mutability_pointer (value))
2208                 printf ("Controled Mutability MP: ");
2209
2210         if (stack_slot_is_managed_pointer (value))
2211                 printf ("Managed Pointer to: ");
2212
2213         switch (stack_slot_get_underlying_type (value)) {
2214                 case TYPE_INV:
2215                         printf ("invalid type]");
2216                         return;
2217                 case TYPE_I4:
2218                         printf ("int32]");
2219                         return;
2220                 case TYPE_I8:
2221                         printf ("int64]");
2222                         return;
2223                 case TYPE_NATIVE_INT:
2224                         printf ("native int]");
2225                         return;
2226                 case TYPE_R8:
2227                         printf ("float64]");
2228                         return;
2229                 case TYPE_PTR:
2230                         printf ("unmanaged pointer]");
2231                         return;
2232                 case TYPE_COMPLEX:
2233                         switch (value->type->type) {
2234                         case MONO_TYPE_CLASS:
2235                         case MONO_TYPE_VALUETYPE:
2236                                 printf ("complex] (%s)", value->type->data.klass->name);
2237                                 return;
2238                         case MONO_TYPE_STRING:
2239                                 printf ("complex] (string)");
2240                                 return;
2241                         case MONO_TYPE_OBJECT:
2242                                 printf ("complex] (object)");
2243                                 return;
2244                         case MONO_TYPE_SZARRAY:
2245                                 printf ("complex] (%s [])", value->type->data.klass->name);
2246                                 return;
2247                         case MONO_TYPE_ARRAY:
2248                                 printf ("complex] (%s [%d %d %d])",
2249                                         value->type->data.array->eklass->name,
2250                                         value->type->data.array->rank,
2251                                         value->type->data.array->numsizes,
2252                                         value->type->data.array->numlobounds);
2253                                 return;
2254                         case MONO_TYPE_GENERICINST:
2255                                 printf ("complex] (inst of %s )", value->type->data.generic_class->container_class->name);
2256                                 return;
2257                         case MONO_TYPE_VAR:
2258                                 printf ("complex] (type generic param !%d - %s) ", value->type->data.generic_param->num, mono_generic_param_info (value->type->data.generic_param)->name);
2259                                 return;
2260                         case MONO_TYPE_MVAR:
2261                                 printf ("complex] (method generic param !!%d - %s) ", value->type->data.generic_param->num, mono_generic_param_info (value->type->data.generic_param)->name);
2262                                 return;
2263                         default: {
2264                                 //should be a boxed value
2265                                 char * name = mono_type_full_name (value->type);
2266                                 printf ("complex] %s", name);
2267                                 g_free (name);
2268                                 return;
2269                                 }
2270                         }
2271                 default:
2272                         printf ("unknown stack %x type]\n", value->stype);
2273                         g_assert_not_reached ();
2274         }
2275 }
2276
2277 static void
2278 dump_stack_state (ILCodeDesc *state)
2279 {
2280         int i;
2281
2282         printf ("(%d) ", state->size);
2283         for (i = 0; i < state->size; ++i)
2284                 dump_stack_value (state->stack + i);
2285         printf ("\n");
2286 }
2287 #endif
2288
2289 /*Returns TRUE if candidate array type can be assigned to target.
2290  *Both parameters MUST be of type MONO_TYPE_ARRAY (target->type == MONO_TYPE_ARRAY)
2291  */
2292 static gboolean
2293 is_array_type_compatible (MonoType *target, MonoType *candidate)
2294 {
2295         MonoArrayType *left = target->data.array;
2296         MonoArrayType *right = candidate->data.array;
2297
2298         g_assert (target->type == MONO_TYPE_ARRAY);
2299         g_assert (candidate->type == MONO_TYPE_ARRAY);
2300
2301         if (left->rank != right->rank)
2302                 return FALSE;
2303
2304         return mono_class_is_assignable_from (left->eklass, right->eklass);
2305 }
2306
2307 static int
2308 get_stack_type (MonoType *type)
2309 {
2310         int mask = 0;
2311         int type_kind = type->type;
2312         if (type->byref)
2313                 mask = POINTER_MASK;
2314         /*TODO handle CMMP_MASK */
2315
2316 handle_enum:
2317         switch (type_kind) {
2318         case MONO_TYPE_I1:
2319         case MONO_TYPE_U1:
2320         case MONO_TYPE_BOOLEAN:
2321         case MONO_TYPE_I2:
2322         case MONO_TYPE_U2:
2323         case MONO_TYPE_CHAR:
2324         case MONO_TYPE_I4:
2325         case MONO_TYPE_U4:
2326                 return TYPE_I4 | mask;
2327
2328         case MONO_TYPE_I:
2329         case MONO_TYPE_U:
2330                 return TYPE_NATIVE_INT | mask;
2331
2332         /* FIXME: the spec says that you cannot have a pointer to method pointer, do we need to check this here? */
2333         case MONO_TYPE_FNPTR:
2334         case MONO_TYPE_PTR:
2335         case MONO_TYPE_TYPEDBYREF:
2336                 return TYPE_PTR | mask;
2337
2338         case MONO_TYPE_VAR:
2339         case MONO_TYPE_MVAR:
2340
2341         case MONO_TYPE_CLASS:
2342         case MONO_TYPE_STRING:
2343         case MONO_TYPE_OBJECT:
2344         case MONO_TYPE_SZARRAY:
2345         case MONO_TYPE_ARRAY:
2346                 return TYPE_COMPLEX | mask;
2347
2348         case MONO_TYPE_GENERICINST:
2349                 if (mono_type_is_enum_type (type)) {
2350                         type = mono_type_get_underlying_type_any (type);
2351                         type_kind = type->type;
2352                         goto handle_enum;
2353                 } else {
2354                         return TYPE_COMPLEX | mask;
2355                 }
2356
2357         case MONO_TYPE_I8:
2358         case MONO_TYPE_U8:
2359                 return TYPE_I8 | mask;
2360
2361         case MONO_TYPE_R4:
2362         case MONO_TYPE_R8:
2363                 return TYPE_R8 | mask;
2364
2365         case MONO_TYPE_VALUETYPE:
2366                 if (mono_type_is_enum_type (type)) {
2367                         type = mono_type_get_underlying_type_any (type);
2368                         type_kind = type->type;
2369                         goto handle_enum;
2370                 } else {
2371                         return TYPE_COMPLEX | mask;
2372                 }
2373
2374         default:
2375                 VERIFIER_DEBUG ( printf ("unknown type %02x in eval stack type\n", type->type); );
2376                 g_assert_not_reached ();
2377                 return 0;
2378         }
2379 }
2380
2381 /* convert MonoType to ILStackDesc format (stype) */
2382 static gboolean
2383 set_stack_value (VerifyContext *ctx, ILStackDesc *stack, MonoType *type, int take_addr)
2384 {
2385         int mask = 0;
2386         int type_kind = type->type;
2387
2388         if (type->byref || take_addr)
2389                 mask = POINTER_MASK;
2390         /* TODO handle CMMP_MASK */
2391
2392 handle_enum:
2393         stack->type = type;
2394
2395         switch (type_kind) {
2396         case MONO_TYPE_I1:
2397         case MONO_TYPE_U1:
2398         case MONO_TYPE_BOOLEAN:
2399         case MONO_TYPE_I2:
2400         case MONO_TYPE_U2:
2401         case MONO_TYPE_CHAR:
2402         case MONO_TYPE_I4:
2403         case MONO_TYPE_U4:
2404                 stack->stype = TYPE_I4 | mask;
2405                 break;
2406         case MONO_TYPE_I:
2407         case MONO_TYPE_U:
2408                 stack->stype = TYPE_NATIVE_INT | mask;
2409                 break;
2410
2411         /*FIXME: Do we need to check if it's a pointer to the method pointer? The spec says it' illegal to have that.*/
2412         case MONO_TYPE_FNPTR:
2413         case MONO_TYPE_PTR:
2414         case MONO_TYPE_TYPEDBYREF:
2415                 stack->stype = TYPE_PTR | mask;
2416                 break;
2417
2418         case MONO_TYPE_CLASS:
2419         case MONO_TYPE_STRING:
2420         case MONO_TYPE_OBJECT:
2421         case MONO_TYPE_SZARRAY:
2422         case MONO_TYPE_ARRAY:
2423
2424         case MONO_TYPE_VAR:
2425         case MONO_TYPE_MVAR:
2426                 stack->stype = TYPE_COMPLEX | mask;
2427                 break;
2428
2429         case MONO_TYPE_GENERICINST:
2430                 if (mono_type_is_enum_type (type)) {
2431                         type = mono_type_get_underlying_type_any (type);
2432                         type_kind = type->type;
2433                         goto handle_enum;
2434                 } else {
2435                         stack->stype = TYPE_COMPLEX | mask;
2436                         break;
2437                 }
2438
2439         case MONO_TYPE_I8:
2440         case MONO_TYPE_U8:
2441                 stack->stype = TYPE_I8 | mask;
2442                 break;
2443         case MONO_TYPE_R4:
2444         case MONO_TYPE_R8:
2445                 stack->stype = TYPE_R8 | mask;
2446                 break;
2447         case MONO_TYPE_VALUETYPE:
2448                 if (mono_type_is_enum_type (type)) {
2449                         type = mono_type_get_underlying_type_any (type);
2450                         type_kind = type->type;
2451                         goto handle_enum;
2452                 } else {
2453                         stack->stype = TYPE_COMPLEX | mask;
2454                         break;
2455                 }
2456         default:
2457                 VERIFIER_DEBUG ( printf ("unknown type 0x%02x in eval stack type\n", type->type); );
2458                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Illegal value set on stack 0x%02x at %d", type->type, ctx->ip_offset));
2459                 return FALSE;
2460         }
2461         return TRUE;
2462 }
2463
2464 /*
2465  * init_stack_with_value_at_exception_boundary:
2466  *
2467  * Initialize the stack and push a given type.
2468  * The instruction is marked as been on the exception boundary.
2469  */
2470 static void
2471 init_stack_with_value_at_exception_boundary (VerifyContext *ctx, ILCodeDesc *code, MonoClass *klass)
2472 {
2473         MonoError error;
2474         MonoType *type = mono_class_inflate_generic_type_checked (&klass->byval_arg, ctx->generic_context, &error);
2475
2476         if (!mono_error_ok (&error)) {
2477                 char *name = mono_type_get_full_name (klass);
2478                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid class %s used for exception", name));
2479                 g_free (name);
2480                 mono_error_cleanup (&error);
2481                 return;
2482         }
2483
2484         stack_init (ctx, code);
2485         set_stack_value (ctx, code->stack, type, FALSE);
2486         ctx->exception_types = g_slist_prepend (ctx->exception_types, type);
2487         code->size = 1;
2488         code->flags |= IL_CODE_FLAG_WAS_TARGET;
2489         if (mono_type_is_generic_argument (type))
2490                 code->stack->stype |= BOXED_MASK;
2491 }
2492
2493 /*Verify if type 'candidate' can be stored in type 'target'.
2494  *
2495  * If strict, check for the underlying type and not the verification stack types
2496  */
2497 static gboolean
2498 verify_type_compatibility_full (VerifyContext *ctx, MonoType *target, MonoType *candidate, gboolean strict)
2499 {
2500 #define IS_ONE_OF3(T, A, B, C) (T == A || T == B || T == C)
2501 #define IS_ONE_OF2(T, A, B) (T == A || T == B)
2502
2503         MonoType *original_candidate = candidate;
2504         VERIFIER_DEBUG ( printf ("checking type compatibility %s x %s strict %d\n", mono_type_full_name (target), mono_type_full_name (candidate), strict); );
2505
2506         /*only one is byref */
2507         if (candidate->byref ^ target->byref) {
2508                 /* converting from native int to byref*/
2509                 if (get_stack_type (candidate) == TYPE_NATIVE_INT && target->byref) {
2510                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("using byref native int at 0x%04x", ctx->ip_offset));
2511                         return TRUE;
2512                 }
2513                 return FALSE;
2514         }
2515         strict |= target->byref;
2516         /*From now on we don't care about byref anymore, so it's ok to discard it here*/
2517         candidate = mono_type_get_underlying_type_any (candidate);
2518
2519 handle_enum:
2520         switch (target->type) {
2521         case MONO_TYPE_VOID:
2522                 return candidate->type == MONO_TYPE_VOID;
2523         case MONO_TYPE_I1:
2524         case MONO_TYPE_U1:
2525         case MONO_TYPE_BOOLEAN:
2526                 if (strict)
2527                         return IS_ONE_OF3 (candidate->type, MONO_TYPE_I1, MONO_TYPE_U1, MONO_TYPE_BOOLEAN);
2528         case MONO_TYPE_I2:
2529         case MONO_TYPE_U2:
2530         case MONO_TYPE_CHAR:
2531                 if (strict)
2532                         return IS_ONE_OF3 (candidate->type, MONO_TYPE_I2, MONO_TYPE_U2, MONO_TYPE_CHAR);
2533         case MONO_TYPE_I4:
2534         case MONO_TYPE_U4: {
2535                 gboolean is_native_int = IS_ONE_OF2 (candidate->type, MONO_TYPE_I, MONO_TYPE_U);
2536                 gboolean is_int4 = IS_ONE_OF2 (candidate->type, MONO_TYPE_I4, MONO_TYPE_U4);
2537                 if (strict)
2538                         return is_native_int || is_int4;
2539                 return is_native_int || get_stack_type (candidate) == TYPE_I4;
2540         }
2541
2542         case MONO_TYPE_I8:
2543         case MONO_TYPE_U8:
2544                 return IS_ONE_OF2 (candidate->type, MONO_TYPE_I8, MONO_TYPE_U8);
2545
2546         case MONO_TYPE_R4:
2547         case MONO_TYPE_R8:
2548                 if (strict)
2549                         return candidate->type == target->type;
2550                 return IS_ONE_OF2 (candidate->type, MONO_TYPE_R4, MONO_TYPE_R8);
2551
2552         case MONO_TYPE_I:
2553         case MONO_TYPE_U: {
2554                 gboolean is_native_int = IS_ONE_OF2 (candidate->type, MONO_TYPE_I, MONO_TYPE_U);
2555                 gboolean is_int4 = IS_ONE_OF2 (candidate->type, MONO_TYPE_I4, MONO_TYPE_U4);
2556                 if (strict)
2557                         return is_native_int || is_int4;
2558                 return is_native_int || get_stack_type (candidate) == TYPE_I4;
2559         }
2560
2561         case MONO_TYPE_PTR:
2562                 if (candidate->type != MONO_TYPE_PTR)
2563                         return FALSE;
2564                 /* check the underlying type */
2565                 return verify_type_compatibility_full (ctx, target->data.type, candidate->data.type, TRUE);
2566
2567         case MONO_TYPE_FNPTR: {
2568                 MonoMethodSignature *left, *right;
2569                 if (candidate->type != MONO_TYPE_FNPTR)
2570                         return FALSE;
2571
2572                 left = mono_type_get_signature (target);
2573                 right = mono_type_get_signature (candidate);
2574                 return mono_metadata_signature_equal (left, right) && left->call_convention == right->call_convention;
2575         }
2576
2577         case MONO_TYPE_GENERICINST: {
2578                 MonoClass *target_klass;
2579                 MonoClass *candidate_klass;
2580                 if (mono_type_is_enum_type (target)) {
2581                         target = mono_type_get_underlying_type_any (target);
2582                         goto handle_enum;
2583                 }
2584                 target_klass = mono_class_from_mono_type (target);
2585                 candidate_klass = mono_class_from_mono_type (candidate);
2586                 if (mono_class_is_nullable (target_klass)) {
2587                         if (!mono_class_is_nullable (candidate_klass))
2588                                 return FALSE;
2589                         return target_klass == candidate_klass;
2590                 }
2591
2592                 return mono_class_is_assignable_from (target_klass, candidate_klass);
2593         }
2594
2595         case MONO_TYPE_STRING:
2596                 return candidate->type == MONO_TYPE_STRING;
2597
2598         case MONO_TYPE_CLASS:
2599                 /*
2600                  * VAR / MVAR compatibility must be checked by verify_stack_type_compatibility
2601                  * to take boxing status into account.
2602                  */
2603                 if (mono_type_is_generic_argument (original_candidate))
2604                         return FALSE;
2605                 /* If candidate is an enum it should return true for System.Enum and supertypes.
2606                  * That's why here we use the original type and not the underlying type.
2607                  */
2608                 return mono_class_is_assignable_from (target->data.klass, mono_class_from_mono_type (original_candidate));
2609
2610         case MONO_TYPE_OBJECT:
2611                 return MONO_TYPE_IS_REFERENCE (candidate);
2612
2613         case MONO_TYPE_SZARRAY: {
2614                 MonoClass *left;
2615                 MonoClass *right;
2616                 if (candidate->type != MONO_TYPE_SZARRAY)
2617                         return FALSE;
2618
2619                 left = mono_class_from_mono_type (target)->element_class;
2620                 right = mono_class_from_mono_type (candidate)->element_class;
2621                 return mono_class_is_assignable_from (left, right);
2622         }
2623
2624         case MONO_TYPE_ARRAY:
2625                 if (candidate->type != MONO_TYPE_ARRAY)
2626                         return FALSE;
2627                 return is_array_type_compatible (target, candidate);
2628
2629         case MONO_TYPE_TYPEDBYREF:
2630                 return candidate->type == MONO_TYPE_TYPEDBYREF;
2631
2632         case MONO_TYPE_VALUETYPE: {
2633                 MonoClass *target_klass  = mono_class_from_mono_type (target);
2634                 MonoClass *candidate_klass = mono_class_from_mono_type (candidate);
2635
2636                 if (target_klass == candidate_klass)
2637                         return TRUE;
2638                 if (mono_type_is_enum_type (target)) {
2639                         target = mono_type_get_underlying_type_any (target);
2640                         goto handle_enum;
2641                 }
2642                 return FALSE;
2643         }
2644
2645         case MONO_TYPE_VAR:
2646                 if (candidate->type != MONO_TYPE_VAR)
2647                         return FALSE;
2648                 return mono_type_get_generic_param_num (candidate) == mono_type_get_generic_param_num (target);
2649
2650         case MONO_TYPE_MVAR:
2651                 if (candidate->type != MONO_TYPE_MVAR)
2652                         return FALSE;
2653                 return mono_type_get_generic_param_num (candidate) == mono_type_get_generic_param_num (target);
2654
2655         default:
2656                 VERIFIER_DEBUG ( printf ("unknown store type %d\n", target->type); );
2657                 g_assert_not_reached ();
2658                 return FALSE;
2659         }
2660         return 1;
2661 #undef IS_ONE_OF3
2662 #undef IS_ONE_OF2
2663 }
2664
2665 static gboolean
2666 verify_type_compatibility (VerifyContext *ctx, MonoType *target, MonoType *candidate)
2667 {
2668         return verify_type_compatibility_full (ctx, target, candidate, FALSE);
2669 }
2670
2671 /*
2672  * Returns the generic param bound to the context been verified.
2673  *
2674  */
2675 static MonoGenericParam*
2676 get_generic_param (VerifyContext *ctx, MonoType *param)
2677 {
2678         guint16 param_num = mono_type_get_generic_param_num (param);
2679         if (param->type == MONO_TYPE_VAR) {
2680                 if (!ctx->generic_context->class_inst || ctx->generic_context->class_inst->type_argc <= param_num) {
2681                         ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid generic type argument %d", param_num));
2682                         return NULL;
2683                 }
2684                 return ctx->generic_context->class_inst->type_argv [param_num]->data.generic_param;
2685         }
2686
2687         /*param must be a MVAR */
2688         if (!ctx->generic_context->method_inst || ctx->generic_context->method_inst->type_argc <= param_num) {
2689                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid generic method argument %d", param_num));
2690                 return NULL;
2691         }
2692         return ctx->generic_context->method_inst->type_argv [param_num]->data.generic_param;
2693
2694 }
2695 /*
2696  * is_compatible_boxed_valuetype:
2697  *
2698  * Returns TRUE if @candidate / @stack is a valid boxed valuetype.
2699  *
2700  * @type The source type. It it tested to be of the proper type.
2701  * @candidate type of the boxed valuetype.
2702  * @stack stack slot of the boxed valuetype, separate from @candidade since one could be changed before calling this function
2703  * @strict if TRUE candidate must be boxed compatible to the target type
2704  *
2705  */
2706 static gboolean
2707 is_compatible_boxed_valuetype (VerifyContext *ctx, MonoType *type, MonoType *candidate, ILStackDesc *stack, gboolean strict)
2708 {
2709         if (!stack_slot_is_boxed_value (stack))
2710                 return FALSE;
2711         if (type->byref || candidate->byref)
2712                 return FALSE;
2713
2714         if (mono_type_is_generic_argument (candidate)) {
2715                 MonoGenericParam *param = get_generic_param (ctx, candidate);
2716                 MonoClass **class;
2717                 for (class = mono_generic_param_info (param)->constraints; class && *class; ++class) {
2718                         if (verify_type_compatibility_full (ctx, type, mono_type_get_type_byval (& (*class)->byval_arg), FALSE))
2719                                 return TRUE;
2720                 }
2721         }
2722
2723         if (mono_type_is_generic_argument (type))
2724                 return FALSE;
2725
2726         if (!strict)
2727                 return TRUE;
2728
2729         return MONO_TYPE_IS_REFERENCE (type) && mono_class_is_assignable_from (mono_class_from_mono_type (type), mono_class_from_mono_type (candidate));
2730 }
2731
2732 static int
2733 verify_stack_type_compatibility_full (VerifyContext *ctx, MonoType *type, ILStackDesc *stack, gboolean drop_byref, gboolean valuetype_must_be_boxed)
2734 {
2735         MonoType *candidate = mono_type_from_stack_slot (stack);
2736         if (MONO_TYPE_IS_REFERENCE (type) && !type->byref && stack_slot_is_null_literal (stack))
2737                 return TRUE;
2738
2739         if (is_compatible_boxed_valuetype (ctx, type, candidate, stack, TRUE))
2740                 return TRUE;
2741
2742         if (valuetype_must_be_boxed && !stack_slot_is_boxed_value (stack) && !MONO_TYPE_IS_REFERENCE (candidate))
2743                 return FALSE;
2744
2745         if (!valuetype_must_be_boxed && stack_slot_is_boxed_value (stack))
2746                 return FALSE;
2747
2748         if (drop_byref)
2749                 return verify_type_compatibility_full (ctx, type, mono_type_get_type_byval (candidate), FALSE);
2750
2751         return verify_type_compatibility_full (ctx, type, candidate, FALSE);
2752 }
2753
2754 static int
2755 verify_stack_type_compatibility (VerifyContext *ctx, MonoType *type, ILStackDesc *stack)
2756 {
2757         return verify_stack_type_compatibility_full (ctx, type, stack, FALSE, FALSE);
2758 }
2759
2760 static gboolean
2761 mono_delegate_type_equal (MonoType *target, MonoType *candidate)
2762 {
2763         if (candidate->byref ^ target->byref)
2764                 return FALSE;
2765
2766         switch (target->type) {
2767         case MONO_TYPE_VOID:
2768         case MONO_TYPE_I1:
2769         case MONO_TYPE_U1:
2770         case MONO_TYPE_BOOLEAN:
2771         case MONO_TYPE_I2:
2772         case MONO_TYPE_U2:
2773         case MONO_TYPE_CHAR:
2774         case MONO_TYPE_I4:
2775         case MONO_TYPE_U4:
2776         case MONO_TYPE_I8:
2777         case MONO_TYPE_U8:
2778         case MONO_TYPE_R4:
2779         case MONO_TYPE_R8:
2780         case MONO_TYPE_I:
2781         case MONO_TYPE_U:
2782         case MONO_TYPE_STRING:
2783         case MONO_TYPE_TYPEDBYREF:
2784                 return candidate->type == target->type;
2785
2786         case MONO_TYPE_PTR:
2787                 return mono_delegate_type_equal (target->data.type, candidate->data.type);
2788
2789         case MONO_TYPE_FNPTR:
2790                 if (candidate->type != MONO_TYPE_FNPTR)
2791                         return FALSE;
2792                 return mono_delegate_signature_equal (mono_type_get_signature (target), mono_type_get_signature (candidate), FALSE);
2793
2794         case MONO_TYPE_GENERICINST: {
2795                 MonoClass *target_klass;
2796                 MonoClass *candidate_klass;
2797                 target_klass = mono_class_from_mono_type (target);
2798                 candidate_klass = mono_class_from_mono_type (candidate);
2799                 /*FIXME handle nullables and enum*/
2800                 return mono_class_is_assignable_from (target_klass, candidate_klass);
2801         }
2802         case MONO_TYPE_OBJECT:
2803                 return MONO_TYPE_IS_REFERENCE (candidate);
2804
2805         case MONO_TYPE_CLASS:
2806                 return mono_class_is_assignable_from(target->data.klass, mono_class_from_mono_type (candidate));
2807
2808         case MONO_TYPE_SZARRAY:
2809                 if (candidate->type != MONO_TYPE_SZARRAY)
2810                         return FALSE;
2811                 return mono_class_is_assignable_from (mono_class_from_mono_type (target)->element_class, mono_class_from_mono_type (candidate)->element_class);
2812
2813         case MONO_TYPE_ARRAY:
2814                 if (candidate->type != MONO_TYPE_ARRAY)
2815                         return FALSE;
2816                 return is_array_type_compatible (target, candidate);
2817
2818         case MONO_TYPE_VALUETYPE:
2819                 /*FIXME handle nullables and enum*/
2820                 return mono_class_from_mono_type (candidate) == mono_class_from_mono_type (target);
2821
2822         case MONO_TYPE_VAR:
2823                 return candidate->type == MONO_TYPE_VAR && mono_type_get_generic_param_num (target) == mono_type_get_generic_param_num (candidate);
2824                 return FALSE;
2825
2826         case MONO_TYPE_MVAR:
2827                 return candidate->type == MONO_TYPE_MVAR && mono_type_get_generic_param_num (target) == mono_type_get_generic_param_num (candidate);
2828                 return FALSE;
2829
2830         default:
2831                 VERIFIER_DEBUG ( printf ("Unknown type %d. Implement me!\n", target->type); );
2832                 g_assert_not_reached ();
2833                 return FALSE;
2834         }
2835 }
2836
2837 static gboolean
2838 mono_delegate_param_equal (MonoType *delegate, MonoType *method)
2839 {
2840         if (mono_metadata_type_equal_full (delegate, method, TRUE))
2841                 return TRUE;
2842
2843         return mono_delegate_type_equal (method, delegate);
2844 }
2845
2846 static gboolean
2847 mono_delegate_ret_equal (MonoType *delegate, MonoType *method)
2848 {
2849         if (mono_metadata_type_equal_full (delegate, method, TRUE))
2850                 return TRUE;
2851
2852         return mono_delegate_type_equal (delegate, method);
2853 }
2854
2855 /*
2856  * mono_delegate_signature_equal:
2857  *
2858  * Compare two signatures in the way expected by delegates.
2859  *
2860  * This function only exists due to the fact that it should ignore the 'has_this' part of the signature.
2861  *
2862  * FIXME can this function be eliminated and proper metadata functionality be used?
2863  */
2864 static gboolean
2865 mono_delegate_signature_equal (MonoMethodSignature *delegate_sig, MonoMethodSignature *method_sig, gboolean is_static_ldftn)
2866 {
2867         int i;
2868         int method_offset = is_static_ldftn ? 1 : 0;
2869
2870         if (delegate_sig->param_count + method_offset != method_sig->param_count)
2871                 return FALSE;
2872
2873         if (delegate_sig->call_convention != method_sig->call_convention)
2874                 return FALSE;
2875
2876         for (i = 0; i < delegate_sig->param_count; i++) {
2877                 MonoType *p1 = delegate_sig->params [i];
2878                 MonoType *p2 = method_sig->params [i + method_offset];
2879
2880                 if (!mono_delegate_param_equal (p1, p2))
2881                         return FALSE;
2882         }
2883
2884         if (!mono_delegate_ret_equal (delegate_sig->ret, method_sig->ret))
2885                 return FALSE;
2886
2887         return TRUE;
2888 }
2889
2890 /*
2891  * verify_ldftn_delegate:
2892  *
2893  * Verify properties of ldftn based delegates.
2894  */
2895 static void
2896 verify_ldftn_delegate (VerifyContext *ctx, MonoClass *delegate, ILStackDesc *value, ILStackDesc *funptr)
2897 {
2898         MonoMethod *method = funptr->method;
2899
2900         /*ldftn non-final virtuals only allowed if method is not static,
2901          * the object is a this arg (comes from a ldarg.0), and there is no starg.0.
2902          * This rules doesn't apply if the object on stack is a boxed valuetype.
2903          */
2904         if ((method->flags & METHOD_ATTRIBUTE_VIRTUAL) && !(method->flags & METHOD_ATTRIBUTE_FINAL) && !(method->klass->flags & TYPE_ATTRIBUTE_SEALED) && !stack_slot_is_boxed_value (value)) {
2905                 /*A stdarg 0 must not happen, we fail here only in fail fast mode to avoid double error reports*/
2906                 if (IS_FAIL_FAST_MODE (ctx) && ctx->has_this_store)
2907                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid ldftn with virtual function in method with stdarg 0 at  0x%04x", ctx->ip_offset));
2908
2909                 /*current method must not be static*/
2910                 if (ctx->method->flags & METHOD_ATTRIBUTE_STATIC)
2911                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid ldftn with virtual function at 0x%04x", ctx->ip_offset));
2912
2913                 /*value is the this pointer, loaded using ldarg.0 */
2914                 if (!stack_slot_is_this_pointer (value))
2915                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid object argument, it is not the this pointer, to ldftn with virtual method at  0x%04x", ctx->ip_offset));
2916
2917                 ctx->code [ctx->ip_offset].flags |= IL_CODE_LDFTN_DELEGATE_NONFINAL_VIRTUAL;
2918         }
2919 }
2920
2921 /*
2922  * verify_delegate_compatibility:
2923  *
2924  * Verify delegate creation sequence.
2925  *
2926  */
2927 static void
2928 verify_delegate_compatibility (VerifyContext *ctx, MonoClass *delegate, ILStackDesc *value, ILStackDesc *funptr)
2929 {
2930 #define IS_VALID_OPCODE(offset, opcode) (ip [ip_offset - offset] == opcode && (ctx->code [ip_offset - offset].flags & IL_CODE_FLAG_SEEN))
2931 #define IS_LOAD_FUN_PTR(kind) (IS_VALID_OPCODE (6, CEE_PREFIX1) && ip [ip_offset - 5] == kind)
2932
2933         MonoMethod *invoke, *method;
2934         const guint8 *ip = ctx->header->code;
2935         guint32 ip_offset = ctx->ip_offset;
2936         gboolean is_static_ldftn = FALSE, is_first_arg_bound = FALSE;
2937
2938         if (stack_slot_get_type (funptr) != TYPE_PTR || !funptr->method) {
2939                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid function pointer parameter for delegate constructor at 0x%04x", ctx->ip_offset));
2940                 return;
2941         }
2942
2943         invoke = mono_get_delegate_invoke (delegate);
2944         method = funptr->method;
2945
2946         is_static_ldftn = (ip_offset > 5 && IS_LOAD_FUN_PTR (CEE_LDFTN)) && method->flags & METHOD_ATTRIBUTE_STATIC;
2947
2948         if (is_static_ldftn)
2949                 is_first_arg_bound = mono_method_signature (invoke)->param_count + 1 ==  mono_method_signature (method)->param_count;
2950
2951         if (!mono_delegate_signature_equal (mono_method_signature (invoke), mono_method_signature (method), is_first_arg_bound)) {
2952                 char *fun_sig = mono_signature_get_desc (mono_method_signature (method), FALSE);
2953                 char *invoke_sig = mono_signature_get_desc (mono_method_signature (invoke), FALSE);
2954                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Function pointer signature '%s' doesn't match delegate's signature '%s' at 0x%04x", fun_sig, invoke_sig, ctx->ip_offset));
2955                 g_free (fun_sig);
2956                 g_free (invoke_sig);
2957         }
2958
2959         /*
2960          * Delegate code sequences:
2961          * [-6] ldftn token
2962          * newobj ...
2963          *
2964          *
2965          * [-7] dup
2966          * [-6] ldvirtftn token
2967          * newobj ...
2968          *
2969          * ldftn sequence:*/
2970         if (ip_offset > 5 && IS_LOAD_FUN_PTR (CEE_LDFTN)) {
2971                 verify_ldftn_delegate (ctx, delegate, value, funptr);
2972         } else if (ip_offset > 6 && IS_VALID_OPCODE (7, CEE_DUP) && IS_LOAD_FUN_PTR (CEE_LDVIRTFTN)) {
2973                 ctx->code [ip_offset - 6].flags |= IL_CODE_DELEGATE_SEQUENCE;
2974         }else {
2975                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid code sequence for delegate creation at 0x%04x", ctx->ip_offset));
2976         }
2977         ctx->code [ip_offset].flags |= IL_CODE_DELEGATE_SEQUENCE;
2978
2979         //general tests
2980         if (is_first_arg_bound) {
2981                 if (mono_method_signature (method)->param_count == 0 || !verify_stack_type_compatibility_full (ctx, mono_method_signature (method)->params [0], value, FALSE, TRUE))
2982                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("This object not compatible with function pointer for delegate creation at 0x%04x", ctx->ip_offset));
2983         } else {
2984                 if (method->flags & METHOD_ATTRIBUTE_STATIC) {
2985                         if (!stack_slot_is_null_literal (value) && !is_first_arg_bound)
2986                                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Non-null this args used with static function for delegate creation at 0x%04x", ctx->ip_offset));
2987                 } else {
2988                         if (!verify_stack_type_compatibility_full (ctx, &method->klass->byval_arg, value, FALSE, TRUE) && !stack_slot_is_null_literal (value))
2989                                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("This object not compatible with function pointer for delegate creation at 0x%04x", ctx->ip_offset));
2990                 }
2991         }
2992
2993         if (stack_slot_get_type (value) != TYPE_COMPLEX)
2994                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid first parameter for delegate creation at 0x%04x", ctx->ip_offset));
2995
2996 #undef IS_VALID_OPCODE
2997 #undef IS_LOAD_FUN_PTR
2998 }
2999
3000 /* implement the opcode checks*/
3001 static void
3002 push_arg (VerifyContext *ctx, unsigned int arg, int take_addr)
3003 {
3004         ILStackDesc *top;
3005
3006         if (arg >= ctx->max_args) {
3007                 if (take_addr)
3008                         ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method doesn't have argument %d", arg + 1));
3009                 else {
3010                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Method doesn't have argument %d", arg + 1));
3011                         if (check_overflow (ctx)) //FIXME: what sane value could we ever push?
3012                                 stack_push_val (ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
3013                 }
3014         } else if (check_overflow (ctx)) {
3015                 /*We must let the value be pushed, otherwise we would get an underflow error*/
3016                 check_unverifiable_type (ctx, ctx->params [arg]);
3017                 if (ctx->params [arg]->byref && take_addr)
3018                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("ByRef of ByRef at 0x%04x", ctx->ip_offset));
3019                 top = stack_push (ctx);
3020                 if (!set_stack_value (ctx, top, ctx->params [arg], take_addr))
3021                         return;
3022
3023                 if (arg == 0 && !(ctx->method->flags & METHOD_ATTRIBUTE_STATIC)) {
3024                         if (take_addr)
3025                                 ctx->has_this_store = TRUE;
3026                         else
3027                                 top->stype |= THIS_POINTER_MASK;
3028                         if (mono_method_is_constructor (ctx->method) && !ctx->super_ctor_called && !ctx->method->klass->valuetype)
3029                                 top->stype |= UNINIT_THIS_MASK;
3030                 }
3031         }
3032 }
3033
3034 static void
3035 push_local (VerifyContext *ctx, guint32 arg, int take_addr)
3036 {
3037         if (arg >= ctx->num_locals) {
3038                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method doesn't have local %d", arg + 1));
3039         } else if (check_overflow (ctx)) {
3040                 /*We must let the value be pushed, otherwise we would get an underflow error*/
3041                 check_unverifiable_type (ctx, ctx->locals [arg]);
3042                 if (ctx->locals [arg]->byref && take_addr)
3043                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("ByRef of ByRef at 0x%04x", ctx->ip_offset));
3044
3045                 set_stack_value (ctx, stack_push (ctx), ctx->locals [arg], take_addr);
3046         }
3047 }
3048
3049 static void
3050 store_arg (VerifyContext *ctx, guint32 arg)
3051 {
3052         ILStackDesc *value;
3053
3054         if (arg >= ctx->max_args) {
3055                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Method doesn't have argument %d at 0x%04x", arg + 1, ctx->ip_offset));
3056                 if (check_underflow (ctx, 1))
3057                         stack_pop (ctx);
3058                 return;
3059         }
3060
3061         if (check_underflow (ctx, 1)) {
3062                 value = stack_pop (ctx);
3063                 if (!verify_stack_type_compatibility (ctx, ctx->params [arg], value)) {
3064                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible type %s in argument store at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
3065                 }
3066         }
3067         if (arg == 0 && !(ctx->method->flags & METHOD_ATTRIBUTE_STATIC))
3068                 ctx->has_this_store = 1;
3069 }
3070
3071 static void
3072 store_local (VerifyContext *ctx, guint32 arg)
3073 {
3074         ILStackDesc *value;
3075         if (arg >= ctx->num_locals) {
3076                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method doesn't have local var %d at 0x%04x", arg + 1, ctx->ip_offset));
3077                 return;
3078         }
3079
3080         /*TODO verify definite assigment */
3081         if (check_underflow (ctx, 1)) {
3082                 value = stack_pop(ctx);
3083                 if (!verify_stack_type_compatibility (ctx, ctx->locals [arg], value)) {
3084                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible type [%s], type [%s] was expected in local store at 0x%04x",
3085                                         stack_slot_get_name (value),
3086                                         mono_type_get_stack_name (ctx->locals [arg]),
3087                                         ctx->ip_offset));
3088                 }
3089         }
3090 }
3091
3092 /*FIXME add and sub needs special care here*/
3093 static void
3094 do_binop (VerifyContext *ctx, unsigned int opcode, const unsigned char table [TYPE_MAX][TYPE_MAX])
3095 {
3096         ILStackDesc *a, *b, *top;
3097         int idxa, idxb, complexMerge = 0;
3098         unsigned char res;
3099
3100         if (!check_underflow (ctx, 2))
3101                 return;
3102         b = stack_pop (ctx);
3103         a = stack_pop (ctx);
3104
3105         idxa = stack_slot_get_underlying_type (a);
3106         if (stack_slot_is_managed_pointer (a)) {
3107                 idxa = TYPE_PTR;
3108                 complexMerge = 1;
3109         }
3110
3111         idxb = stack_slot_get_underlying_type (b);
3112         if (stack_slot_is_managed_pointer (b)) {
3113                 idxb = TYPE_PTR;
3114                 complexMerge = 2;
3115         }
3116
3117         --idxa;
3118         --idxb;
3119         res = table [idxa][idxb];
3120
3121         VERIFIER_DEBUG ( printf ("binop res %d\n", res); );
3122         VERIFIER_DEBUG ( printf ("idxa %d idxb %d\n", idxa, idxb); );
3123
3124         top = stack_push (ctx);
3125         if (res == TYPE_INV) {
3126                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Binary instruction applyed to ill formed stack (%s x %s)", stack_slot_get_name (a), stack_slot_get_name (b)));
3127                 copy_stack_value (top, a);
3128                 return;
3129         }
3130
3131         if (res & NON_VERIFIABLE_RESULT) {
3132                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Binary instruction is not verifiable (%s x %s)", stack_slot_get_name (a), stack_slot_get_name (b)));
3133
3134                 res = res & ~NON_VERIFIABLE_RESULT;
3135         }
3136
3137         if (complexMerge && res == TYPE_PTR) {
3138                 if (complexMerge == 1)
3139                         copy_stack_value (top, a);
3140                 else if (complexMerge == 2)
3141                         copy_stack_value (top, b);
3142                 /*
3143                  * There is no need to merge the type of two pointers.
3144                  * The only valid operation is subtraction, that returns a native
3145                  *  int as result and can be used with any 2 pointer kinds.
3146                  * This is valid acording to Patition III 1.1.4
3147                  */
3148         } else
3149                 top->stype = res;
3150
3151 }
3152
3153
3154 static void
3155 do_boolean_branch_op (VerifyContext *ctx, int delta)
3156 {
3157         int target = ctx->ip_offset + delta;
3158         ILStackDesc *top;
3159
3160         VERIFIER_DEBUG ( printf ("boolean branch offset %d delta %d target %d\n", ctx->ip_offset, delta, target); );
3161
3162         if (target < 0 || target >= ctx->code_size) {
3163                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Boolean branch target out of code at 0x%04x", ctx->ip_offset));
3164                 return;
3165         }
3166
3167         switch (is_valid_branch_instruction (ctx->header, ctx->ip_offset, target)) {
3168         case 1:
3169                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
3170                 break;
3171         case 2:
3172                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
3173                 return;
3174         }
3175
3176         ctx->target = target;
3177
3178         if (!check_underflow (ctx, 1))
3179                 return;
3180
3181         top = stack_pop (ctx);
3182         if (!is_valid_bool_arg (top))
3183                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Argument type %s not valid for brtrue/brfalse at 0x%04x", stack_slot_get_name (top), ctx->ip_offset));
3184
3185         check_unmanaged_pointer (ctx, top);
3186 }
3187
3188 static gboolean
3189 stack_slot_is_complex_type_not_reference_type (ILStackDesc *slot)
3190 {
3191         return stack_slot_get_type (slot) == TYPE_COMPLEX && !MONO_TYPE_IS_REFERENCE (slot->type) && !stack_slot_is_boxed_value (slot);
3192 }
3193
3194 static void
3195 do_branch_op (VerifyContext *ctx, signed int delta, const unsigned char table [TYPE_MAX][TYPE_MAX])
3196 {
3197         ILStackDesc *a, *b;
3198         int idxa, idxb;
3199         unsigned char res;
3200         int target = ctx->ip_offset + delta;
3201
3202         VERIFIER_DEBUG ( printf ("branch offset %d delta %d target %d\n", ctx->ip_offset, delta, target); );
3203
3204         if (target < 0 || target >= ctx->code_size) {
3205                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target out of code at 0x%04x", ctx->ip_offset));
3206                 return;
3207         }
3208
3209         switch (is_valid_cmp_branch_instruction (ctx->header, ctx->ip_offset, target)) {
3210         case 1: /*FIXME use constants and not magic numbers.*/
3211                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
3212                 break;
3213         case 2:
3214                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
3215                 return;
3216         }
3217
3218         ctx->target = target;
3219
3220         if (!check_underflow (ctx, 2))
3221                 return;
3222
3223         b = stack_pop (ctx);
3224         a = stack_pop (ctx);
3225
3226         idxa = stack_slot_get_underlying_type (a);
3227         if (stack_slot_is_managed_pointer (a))
3228                 idxa = TYPE_PTR;
3229
3230         idxb = stack_slot_get_underlying_type (b);
3231         if (stack_slot_is_managed_pointer (b))
3232                 idxb = TYPE_PTR;
3233
3234         if (stack_slot_is_complex_type_not_reference_type (a) || stack_slot_is_complex_type_not_reference_type (b)) {
3235                 res = TYPE_INV;
3236         } else {
3237                 --idxa;
3238                 --idxb;
3239                 res = table [idxa][idxb];
3240         }
3241
3242         VERIFIER_DEBUG ( printf ("branch res %d\n", res); );
3243         VERIFIER_DEBUG ( printf ("idxa %d idxb %d\n", idxa, idxb); );
3244
3245         if (res == TYPE_INV) {
3246                 CODE_NOT_VERIFIABLE (ctx,
3247                         g_strdup_printf ("Compare and Branch instruction applyed to ill formed stack (%s x %s) at 0x%04x", stack_slot_get_name (a), stack_slot_get_name (b), ctx->ip_offset));
3248         } else if (res & NON_VERIFIABLE_RESULT) {
3249                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Compare and Branch instruction is not verifiable (%s x %s) at 0x%04x", stack_slot_get_name (a), stack_slot_get_name (b), ctx->ip_offset));
3250                 res = res & ~NON_VERIFIABLE_RESULT;
3251         }
3252 }
3253
3254 static void
3255 do_cmp_op (VerifyContext *ctx, const unsigned char table [TYPE_MAX][TYPE_MAX], guint32 opcode)
3256 {
3257         ILStackDesc *a, *b;
3258         int idxa, idxb;
3259         unsigned char res;
3260
3261         if (!check_underflow (ctx, 2))
3262                 return;
3263         b = stack_pop (ctx);
3264         a = stack_pop (ctx);
3265
3266         if (opcode == CEE_CGT_UN) {
3267                 if (stack_slot_get_type (a) == TYPE_COMPLEX && stack_slot_get_type (b) == TYPE_COMPLEX) {
3268                         stack_push_val (ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
3269                         return;
3270                 }
3271         }
3272
3273         idxa = stack_slot_get_underlying_type (a);
3274         if (stack_slot_is_managed_pointer (a))
3275                 idxa = TYPE_PTR;
3276
3277         idxb = stack_slot_get_underlying_type (b);
3278         if (stack_slot_is_managed_pointer (b))
3279                 idxb = TYPE_PTR;
3280
3281         if (stack_slot_is_complex_type_not_reference_type (a) || stack_slot_is_complex_type_not_reference_type (b)) {
3282                 res = TYPE_INV;
3283         } else {
3284                 --idxa;
3285                 --idxb;
3286                 res = table [idxa][idxb];
3287         }
3288
3289         if(res == TYPE_INV) {
3290                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf("Compare instruction applyed to ill formed stack (%s x %s) at 0x%04x", stack_slot_get_name (a), stack_slot_get_name (b), ctx->ip_offset));
3291         } else if (res & NON_VERIFIABLE_RESULT) {
3292                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Compare instruction is not verifiable (%s x %s) at 0x%04x", stack_slot_get_name (a), stack_slot_get_name (b), ctx->ip_offset));
3293                 res = res & ~NON_VERIFIABLE_RESULT;
3294         }
3295         stack_push_val (ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
3296 }
3297
3298 static void
3299 do_ret (VerifyContext *ctx)
3300 {
3301         MonoType *ret = ctx->signature->ret;
3302         VERIFIER_DEBUG ( printf ("checking ret\n"); );
3303         if (ret->type != MONO_TYPE_VOID) {
3304                 ILStackDesc *top;
3305                 if (!check_underflow (ctx, 1))
3306                         return;
3307
3308                 top = stack_pop(ctx);
3309
3310                 if (!verify_stack_type_compatibility (ctx, ctx->signature->ret, top)) {
3311                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible return value on stack with method signature ret at 0x%04x", ctx->ip_offset));
3312                         return;
3313                 }
3314
3315                 if (ret->byref || ret->type == MONO_TYPE_TYPEDBYREF || mono_type_is_value_type (ret, "System", "ArgIterator") || mono_type_is_value_type (ret, "System", "RuntimeArgumentHandle"))
3316                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Method returns byref, TypedReference, ArgIterator or RuntimeArgumentHandle at 0x%04x", ctx->ip_offset));
3317         }
3318
3319         if (ctx->eval.size > 0) {
3320                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Stack not empty (%d) after ret at 0x%04x", ctx->eval.size, ctx->ip_offset));
3321         }
3322         if (in_any_block (ctx->header, ctx->ip_offset))
3323                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("ret cannot escape exception blocks at 0x%04x", ctx->ip_offset));
3324 }
3325
3326 /*
3327  * FIXME we need to fix the case of a non-virtual instance method defined in the parent but call using a token pointing to a subclass.
3328  *      This is illegal but mono_get_method_full decoded it.
3329  * TODO handle calling .ctor outside one or calling the .ctor for other class but super
3330  */
3331 static void
3332 do_invoke_method (VerifyContext *ctx, int method_token, gboolean virtual)
3333 {
3334         int param_count, i;
3335         MonoMethodSignature *sig;
3336         ILStackDesc *value;
3337         MonoMethod *method;
3338         gboolean virt_check_this = FALSE;
3339         gboolean constrained = ctx->prefix_set & PREFIX_CONSTRAINED;
3340
3341         if (!(method = verifier_load_method (ctx, method_token, virtual ? "callvirt" : "call")))
3342                 return;
3343
3344         if (virtual) {
3345                 CLEAR_PREFIX (ctx, PREFIX_CONSTRAINED);
3346
3347                 if (method->klass->valuetype) // && !constrained ???
3348                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use callvirtual with valuetype method at 0x%04x", ctx->ip_offset));
3349
3350                 if ((method->flags & METHOD_ATTRIBUTE_STATIC))
3351                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use callvirtual with static method at 0x%04x", ctx->ip_offset));
3352
3353         } else {
3354                 if (method->flags & METHOD_ATTRIBUTE_ABSTRACT)
3355                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use call with an abstract method at 0x%04x", ctx->ip_offset));
3356
3357                 if ((method->flags & METHOD_ATTRIBUTE_VIRTUAL) && !(method->flags & METHOD_ATTRIBUTE_FINAL)) {
3358                         virt_check_this = TRUE;
3359                         ctx->code [ctx->ip_offset].flags |= IL_CODE_CALL_NONFINAL_VIRTUAL;
3360                 }
3361         }
3362
3363         if (!(sig = mono_method_get_signature_full (method, ctx->image, method_token, ctx->generic_context)))
3364                 sig = mono_method_get_signature (method, ctx->image, method_token);
3365
3366         param_count = sig->param_count + sig->hasthis;
3367         if (!check_underflow (ctx, param_count))
3368                 return;
3369
3370         for (i = sig->param_count - 1; i >= 0; --i) {
3371                 VERIFIER_DEBUG ( printf ("verifying argument %d\n", i); );
3372                 value = stack_pop (ctx);
3373                 if (!verify_stack_type_compatibility (ctx, sig->params[i], value)) {
3374                         char *stack_name = stack_slot_full_name (value);
3375                         char *sig_name = mono_type_full_name (sig->params [i]);
3376                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible parameter with function signature: Calling method with signature (%s) but for argument %d there is a (%s) on stack at 0x%04x", sig_name, i, stack_name, ctx->ip_offset));
3377                         g_free (stack_name);
3378                         g_free (sig_name);
3379                 }
3380
3381                 if (stack_slot_is_managed_mutability_pointer (value))
3382                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer as argument of %s at 0x%04x", virtual ? "callvirt" : "call",  ctx->ip_offset));
3383
3384                 if ((ctx->prefix_set & PREFIX_TAIL) && stack_slot_is_managed_pointer (value)) {
3385                         ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Cannot  pass a byref argument to a tail %s at 0x%04x", virtual ? "callvirt" : "call",  ctx->ip_offset));
3386                         return;
3387                 }
3388         }
3389
3390         if (sig->hasthis) {
3391                 MonoType *type = &method->klass->byval_arg;
3392                 ILStackDesc copy;
3393
3394                 if (mono_method_is_constructor (method) && !method->klass->valuetype) {
3395                         if (!mono_method_is_constructor (ctx->method))
3396                                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot call a constructor outside one at 0x%04x", ctx->ip_offset));
3397                         if (method->klass != ctx->method->klass->parent && method->klass != ctx->method->klass)
3398                                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot call a constructor to a type diferent that this or super at 0x%04x", ctx->ip_offset));
3399
3400                         ctx->super_ctor_called = TRUE;
3401                         value = stack_pop_safe (ctx);
3402                         if ((value->stype & THIS_POINTER_MASK) != THIS_POINTER_MASK)
3403                                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid 'this ptr' argument for constructor at 0x%04x", ctx->ip_offset));
3404                 } else {
3405                         value = stack_pop (ctx);
3406                 }
3407
3408                 copy_stack_value (&copy, value);
3409                 //TODO we should extract this to a 'drop_byref_argument' and use everywhere
3410                 //Other parts of the code suffer from the same issue of
3411                 copy.type = mono_type_get_type_byval (copy.type);
3412                 copy.stype &= ~POINTER_MASK;
3413
3414                 if (virt_check_this && !stack_slot_is_this_pointer (value) && !(method->klass->valuetype || stack_slot_is_boxed_value (value)))
3415                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot call a non-final virtual method from an objet diferent thant the this pointer at 0x%04x", ctx->ip_offset));
3416
3417                 if (constrained && virtual) {
3418                         if (!stack_slot_is_managed_pointer (value))
3419                                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Object is not a managed pointer for a constrained call at 0x%04x", ctx->ip_offset));
3420                         if (!mono_metadata_type_equal_full (mono_type_get_type_byval (value->type), ctx->constrained_type, TRUE))
3421                                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Object not compatible with constrained type at 0x%04x", ctx->ip_offset));
3422                         copy.stype |= BOXED_MASK;
3423                 } else {
3424                         if (stack_slot_is_managed_pointer (value) && !mono_class_from_mono_type (value->type)->valuetype)
3425                                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot call a reference type using a managed pointer to the this arg at 0x%04x", ctx->ip_offset));
3426
3427                         if (!virtual && mono_class_from_mono_type (value->type)->valuetype && !method->klass->valuetype && !stack_slot_is_boxed_value (value))
3428                                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot call a valuetype baseclass at 0x%04x", ctx->ip_offset));
3429
3430                         if (virtual && mono_class_from_mono_type (value->type)->valuetype && !stack_slot_is_boxed_value (value))
3431                                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a valuetype with callvirt at 0x%04x", ctx->ip_offset));
3432
3433                         if (method->klass->valuetype && (stack_slot_is_boxed_value (value) || !stack_slot_is_managed_pointer (value)))
3434                                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a boxed or literal valuetype to call a valuetype method at 0x%04x", ctx->ip_offset));
3435                 }
3436                 if (!verify_stack_type_compatibility (ctx, type, &copy))
3437                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible this argument on stack with method signature at 0x%04x", ctx->ip_offset));
3438
3439                 if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_method_full (ctx->method, method, mono_class_from_mono_type (value->type))) {
3440                         char *name = mono_method_full_name (method, TRUE);
3441                         CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Method %s is not accessible at 0x%04x", name, ctx->ip_offset), MONO_EXCEPTION_METHOD_ACCESS);
3442                         g_free (name);
3443                 }
3444
3445         } else if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_method_full (ctx->method, method, NULL)) {
3446                 char *name = mono_method_full_name (method, TRUE);
3447                 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Method %s is not accessible at 0x%04x", name, ctx->ip_offset), MONO_EXCEPTION_METHOD_ACCESS);
3448                 g_free (name);
3449         }
3450
3451         if (sig->ret->type != MONO_TYPE_VOID) {
3452                 if (check_overflow (ctx)) {
3453                         value = stack_push (ctx);
3454                         set_stack_value (ctx, value, sig->ret, FALSE);
3455                         if ((ctx->prefix_set & PREFIX_READONLY) && method->klass->rank && !strcmp (method->name, "Address")) {
3456                                 ctx->prefix_set &= ~PREFIX_READONLY;
3457                                 value->stype |= CMMP_MASK;
3458                         }
3459                 }
3460         }
3461
3462         if ((ctx->prefix_set & PREFIX_TAIL)) {
3463                 if (!mono_delegate_ret_equal (mono_method_signature (ctx->method)->ret, sig->ret))
3464                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Tail call with incompatible return type at 0x%04x", ctx->ip_offset));
3465                 if (ctx->header->code [ctx->ip_offset + 5] != CEE_RET)
3466                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Tail call not followed by ret at 0x%04x", ctx->ip_offset));
3467         }
3468
3469 }
3470
3471 static void
3472 do_push_static_field (VerifyContext *ctx, int token, gboolean take_addr)
3473 {
3474         MonoClassField *field;
3475         MonoClass *klass;
3476         if (!take_addr)
3477                 CLEAR_PREFIX (ctx, PREFIX_VOLATILE);
3478
3479         if (!(field = verifier_load_field (ctx, token, &klass, take_addr ? "ldsflda" : "ldsfld")))
3480                 return;
3481
3482         if (!(field->type->attrs & FIELD_ATTRIBUTE_STATIC)) {
3483                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Cannot load non static field at 0x%04x", ctx->ip_offset));
3484                 return;
3485         }
3486         /*taking the address of initonly field only works from the static constructor */
3487         if (take_addr && (field->type->attrs & FIELD_ATTRIBUTE_INIT_ONLY) &&
3488                 !(field->parent == ctx->method->klass && (ctx->method->flags & (METHOD_ATTRIBUTE_SPECIAL_NAME | METHOD_ATTRIBUTE_STATIC)) && !strcmp (".cctor", ctx->method->name)))
3489                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot take the address of a init-only field at 0x%04x", ctx->ip_offset));
3490
3491         if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_field_full (ctx->method, field, NULL))
3492                 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Type at stack is not accessible at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_FIELD_ACCESS);
3493
3494         set_stack_value (ctx, stack_push (ctx), field->type, take_addr);
3495 }
3496
3497 static void
3498 do_store_static_field (VerifyContext *ctx, int token) {
3499         MonoClassField *field;
3500         MonoClass *klass;
3501         ILStackDesc *value;
3502         CLEAR_PREFIX (ctx, PREFIX_VOLATILE);
3503
3504         if (!check_underflow (ctx, 1))
3505                 return;
3506
3507         value = stack_pop (ctx);
3508
3509         if (!(field = verifier_load_field (ctx, token, &klass, "stsfld")))
3510                 return;
3511
3512         if (!(field->type->attrs & FIELD_ATTRIBUTE_STATIC)) {
3513                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Cannot store non static field at 0x%04x", ctx->ip_offset));
3514                 return;
3515         }
3516
3517         if (field->type->type == MONO_TYPE_TYPEDBYREF) {
3518                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Typedbyref field is an unverfiable type in store static field at 0x%04x", ctx->ip_offset));
3519                 return;
3520         }
3521
3522         if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_field_full (ctx->method, field, NULL))
3523                 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Type at stack is not accessible at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_FIELD_ACCESS);
3524
3525         if (!verify_stack_type_compatibility (ctx, field->type, value))
3526                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible type %s in static field store at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
3527 }
3528
3529 static gboolean
3530 check_is_valid_type_for_field_ops (VerifyContext *ctx, int token, ILStackDesc *obj, MonoClassField **ret_field, const char *opcode)
3531 {
3532         MonoClassField *field;
3533         MonoClass *klass;
3534         gboolean is_pointer;
3535
3536         /*must be a reference type, a managed pointer, an unamanaged pointer, or a valuetype*/
3537         if (!(field = verifier_load_field (ctx, token, &klass, opcode)))
3538                 return FALSE;
3539
3540         *ret_field = field;
3541         //the value on stack is going to be used as a pointer
3542         is_pointer = stack_slot_get_type (obj) == TYPE_PTR || (stack_slot_get_type (obj) == TYPE_NATIVE_INT && !get_stack_type (&field->parent->byval_arg));
3543
3544         if (field->type->type == MONO_TYPE_TYPEDBYREF) {
3545                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Typedbyref field is an unverfiable type at 0x%04x", ctx->ip_offset));
3546                 return FALSE;
3547         }
3548         g_assert (obj->type);
3549
3550         /*The value on the stack must be a subclass of the defining type of the field*/
3551         /* we need to check if we can load the field from the stack value*/
3552         if (is_pointer) {
3553                 if (stack_slot_get_underlying_type (obj) == TYPE_NATIVE_INT)
3554                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Native int is not a verifiable type to reference a field at 0x%04x", ctx->ip_offset));
3555
3556                 if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_field_full (ctx->method, field, NULL))
3557                                 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Type at stack is not accessible at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_FIELD_ACCESS);
3558         } else {
3559                 if (!field->parent->valuetype && stack_slot_is_managed_pointer (obj))
3560                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type at stack is a managed pointer to a reference type and is not compatible to reference the field at 0x%04x", ctx->ip_offset));
3561
3562                 /*a value type can be loaded from a value or a managed pointer, but not a boxed object*/
3563                 if (field->parent->valuetype && stack_slot_is_boxed_value (obj))
3564                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type at stack is a boxed valuetype and is not compatible to reference the field at 0x%04x", ctx->ip_offset));
3565
3566                 if (!stack_slot_is_null_literal (obj) && !verify_stack_type_compatibility_full (ctx, &field->parent->byval_arg, obj, TRUE, FALSE))
3567                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type at stack is not compatible to reference the field at 0x%04x", ctx->ip_offset));
3568
3569                 if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_field_full (ctx->method, field, mono_class_from_mono_type (obj->type)))
3570                         CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Type at stack is not accessible at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_FIELD_ACCESS);
3571         }
3572
3573         check_unmanaged_pointer (ctx, obj);
3574         return TRUE;
3575 }
3576
3577 static void
3578 do_push_field (VerifyContext *ctx, int token, gboolean take_addr)
3579 {
3580         ILStackDesc *obj;
3581         MonoClassField *field;
3582
3583         if (!take_addr)
3584                 CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
3585
3586         if (!check_underflow (ctx, 1))
3587                 return;
3588         obj = stack_pop_safe (ctx);
3589
3590         if (!check_is_valid_type_for_field_ops (ctx, token, obj, &field, take_addr ? "ldflda" : "ldfld"))
3591                 return;
3592
3593         if (take_addr && field->parent->valuetype && !stack_slot_is_managed_pointer (obj))
3594                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot take the address of a temporary value-type at 0x%04x", ctx->ip_offset));
3595
3596         if (take_addr && (field->type->attrs & FIELD_ATTRIBUTE_INIT_ONLY) &&
3597                 !(field->parent == ctx->method->klass && mono_method_is_constructor (ctx->method)))
3598                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot take the address of a init-only field at 0x%04x", ctx->ip_offset));
3599
3600         set_stack_value (ctx, stack_push (ctx), field->type, take_addr);
3601 }
3602
3603 static void
3604 do_store_field (VerifyContext *ctx, int token)
3605 {
3606         ILStackDesc *value, *obj;
3607         MonoClassField *field;
3608         CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
3609
3610         if (!check_underflow (ctx, 2))
3611                 return;
3612
3613         value = stack_pop (ctx);
3614         obj = stack_pop_safe (ctx);
3615
3616         if (!check_is_valid_type_for_field_ops (ctx, token, obj, &field, "stfld"))
3617                 return;
3618
3619         if (!verify_stack_type_compatibility (ctx, field->type, value))
3620                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible type %s in field store at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
3621 }
3622
3623 /*TODO proper handle for Nullable<T>*/
3624 static void
3625 do_box_value (VerifyContext *ctx, int klass_token)
3626 {
3627         ILStackDesc *value;
3628         MonoType *type = get_boxable_mono_type (ctx, klass_token, "box");
3629         MonoClass *klass;
3630
3631         if (!type)
3632                 return;
3633
3634         if (!check_underflow (ctx, 1))
3635                 return;
3636
3637         value = stack_pop (ctx);
3638         /*box is a nop for reference types*/
3639
3640         if (stack_slot_get_underlying_type (value) == TYPE_COMPLEX && MONO_TYPE_IS_REFERENCE (value->type) && MONO_TYPE_IS_REFERENCE (type)) {
3641                 stack_push_stack_val (ctx, value)->stype |= BOXED_MASK;
3642                 return;
3643         }
3644
3645
3646         if (!verify_stack_type_compatibility (ctx, type, value))
3647                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for boxing operation at 0x%04x", ctx->ip_offset));
3648
3649         klass = mono_class_from_mono_type (type);
3650         if (mono_class_is_nullable (klass))
3651                 type = &mono_class_get_nullable_param (klass)->byval_arg;
3652         stack_push_val (ctx, TYPE_COMPLEX | BOXED_MASK, type);
3653 }
3654
3655 static void
3656 do_unbox_value (VerifyContext *ctx, int klass_token)
3657 {
3658         ILStackDesc *value;
3659         MonoType *type = get_boxable_mono_type (ctx, klass_token, "unbox");
3660
3661         if (!type)
3662                 return;
3663
3664         if (!check_underflow (ctx, 1))
3665                 return;
3666
3667         if (!mono_class_from_mono_type (type)->valuetype)
3668                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid reference type for unbox at 0x%04x", ctx->ip_offset));
3669
3670         value = stack_pop (ctx);
3671
3672         /*Value should be: a boxed valuetype or a reference type*/
3673         if (!(stack_slot_get_type (value) == TYPE_COMPLEX &&
3674                 (stack_slot_is_boxed_value (value) || !mono_class_from_mono_type (value->type)->valuetype)))
3675                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type %s at stack for unbox operation at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
3676
3677         set_stack_value (ctx, value = stack_push (ctx), mono_type_get_type_byref (type), FALSE);
3678         value->stype |= CMMP_MASK;
3679 }
3680
3681 static void
3682 do_unbox_any (VerifyContext *ctx, int klass_token)
3683 {
3684         ILStackDesc *value;
3685         MonoType *type = get_boxable_mono_type (ctx, klass_token, "unbox.any");
3686
3687         if (!type)
3688                 return;
3689
3690         if (!check_underflow (ctx, 1))
3691                 return;
3692
3693         value = stack_pop (ctx);
3694
3695         /*Value should be: a boxed valuetype or a reference type*/
3696         if (!(stack_slot_get_type (value) == TYPE_COMPLEX &&
3697                 (stack_slot_is_boxed_value (value) || !mono_class_from_mono_type (value->type)->valuetype)))
3698                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type %s at stack for unbox.any operation at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
3699
3700         set_stack_value (ctx, stack_push (ctx), type, FALSE);
3701 }
3702
3703 static void
3704 do_unary_math_op (VerifyContext *ctx, int op)
3705 {
3706         ILStackDesc *value;
3707         if (!check_underflow (ctx, 1))
3708                 return;
3709         value = stack_pop (ctx);
3710         switch (stack_slot_get_type (value)) {
3711         case TYPE_I4:
3712         case TYPE_I8:
3713         case TYPE_NATIVE_INT:
3714                 break;
3715         case TYPE_R8:
3716                 if (op == CEE_NEG)
3717                         break;
3718         case TYPE_COMPLEX: /*only enums are ok*/
3719                 if (mono_type_is_enum_type (value->type))
3720                         break;
3721         default:
3722                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for unary not at 0x%04x", ctx->ip_offset));
3723         }
3724         stack_push_stack_val (ctx, value);
3725 }
3726
3727 static void
3728 do_conversion (VerifyContext *ctx, int kind)
3729 {
3730         ILStackDesc *value;
3731         if (!check_underflow (ctx, 1))
3732                 return;
3733         value = stack_pop (ctx);
3734
3735         switch (stack_slot_get_type (value)) {
3736         case TYPE_I4:
3737         case TYPE_I8:
3738         case TYPE_NATIVE_INT:
3739         case TYPE_R8:
3740                 break;
3741         default:
3742                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type (%s) at stack for conversion operation. Numeric type expected at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
3743         }
3744
3745         switch (kind) {
3746         case TYPE_I4:
3747                 stack_push_val (ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
3748                 break;
3749         case TYPE_I8:
3750                 stack_push_val (ctx,TYPE_I8, &mono_defaults.int64_class->byval_arg);
3751                 break;
3752         case TYPE_R8:
3753                 stack_push_val (ctx, TYPE_R8, &mono_defaults.double_class->byval_arg);
3754                 break;
3755         case TYPE_NATIVE_INT:
3756                 stack_push_val (ctx, TYPE_NATIVE_INT, &mono_defaults.int_class->byval_arg);
3757                 break;
3758         default:
3759                 g_error ("unknown type %02x in conversion", kind);
3760
3761         }
3762 }
3763
3764 static void
3765 do_load_token (VerifyContext *ctx, int token)
3766 {
3767         gpointer handle;
3768         MonoClass *handle_class;
3769         if (!check_overflow (ctx))
3770                 return;
3771         handle = mono_ldtoken (ctx->image, token, &handle_class, ctx->generic_context);
3772         if (!handle) {
3773                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid token 0x%x for ldtoken at 0x%04x", token, ctx->ip_offset));
3774                 return;
3775         }
3776         if (handle_class == mono_defaults.typehandle_class) {
3777                 mono_type_is_valid_in_context (ctx, (MonoType*)handle);
3778         } else if (handle_class == mono_defaults.methodhandle_class) {
3779                 mono_method_is_valid_in_context (ctx, (MonoMethod*)handle);
3780         } else if (handle_class == mono_defaults.fieldhandle_class) {
3781                 mono_type_is_valid_in_context (ctx, &((MonoClassField*)handle)->parent->byval_arg);
3782         } else {
3783                 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid ldtoken type %x at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
3784         }
3785         stack_push_val (ctx, TYPE_COMPLEX, mono_class_get_type (handle_class));
3786 }
3787
3788 static void
3789 do_ldobj_value (VerifyContext *ctx, int token)
3790 {
3791         ILStackDesc *value;
3792         MonoType *type = get_boxable_mono_type (ctx, token, "ldobj");
3793         CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
3794
3795         if (!type)
3796                 return;
3797
3798         if (!check_underflow (ctx, 1))
3799                 return;
3800
3801         value = stack_pop (ctx);
3802         if (!stack_slot_is_managed_pointer (value)
3803                         && stack_slot_get_type (value) != TYPE_NATIVE_INT
3804                         && !(stack_slot_get_type (value) == TYPE_PTR && value->type->type != MONO_TYPE_FNPTR)) {
3805                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid argument %s to ldobj at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
3806                 return;
3807         }
3808
3809         if (stack_slot_get_type (value) == TYPE_NATIVE_INT)
3810                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Using native pointer to ldobj at 0x%04x", ctx->ip_offset));
3811
3812         /*We have a byval on the stack, but the comparison must be strict. */
3813         if (!verify_type_compatibility_full (ctx, type, mono_type_get_type_byval (value->type), TRUE))
3814                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for ldojb operation at 0x%04x", ctx->ip_offset));
3815
3816         set_stack_value (ctx, stack_push (ctx), type, FALSE);
3817 }
3818
3819 static void
3820 do_stobj (VerifyContext *ctx, int token)
3821 {
3822         ILStackDesc *dest, *src;
3823         MonoType *type = get_boxable_mono_type (ctx, token, "stobj");
3824         CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
3825
3826         if (!type)
3827                 return;
3828
3829         if (!check_underflow (ctx, 2))
3830                 return;
3831
3832         src = stack_pop (ctx);
3833         dest = stack_pop (ctx);
3834
3835         if (stack_slot_is_managed_mutability_pointer (dest))
3836                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with stobj at 0x%04x", ctx->ip_offset));
3837
3838         if (!stack_slot_is_managed_pointer (dest))
3839                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid destination of stobj operation at 0x%04x", ctx->ip_offset));
3840
3841         if (stack_slot_is_boxed_value (src) && !MONO_TYPE_IS_REFERENCE (src->type) && !MONO_TYPE_IS_REFERENCE (type))
3842                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use stobj with a boxed source value that is not a reference type at 0x%04x", ctx->ip_offset));
3843
3844         if (!verify_stack_type_compatibility (ctx, type, src))
3845                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Token and source types of stobj don't match at 0x%04x", ctx->ip_offset));
3846
3847         if (!verify_type_compatibility (ctx, mono_type_get_type_byval (dest->type), type))
3848                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Destination and token types of stobj don't match at 0x%04x", ctx->ip_offset));
3849 }
3850
3851 static void
3852 do_cpobj (VerifyContext *ctx, int token)
3853 {
3854         ILStackDesc *dest, *src;
3855         MonoType *type = get_boxable_mono_type (ctx, token, "cpobj");
3856         if (!type)
3857                 return;
3858
3859         if (!check_underflow (ctx, 2))
3860                 return;
3861
3862         src = stack_pop (ctx);
3863         dest = stack_pop (ctx);
3864
3865         if (!stack_slot_is_managed_pointer (src))
3866                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid source of cpobj operation at 0x%04x", ctx->ip_offset));
3867
3868         if (!stack_slot_is_managed_pointer (dest))
3869                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid destination of cpobj operation at 0x%04x", ctx->ip_offset));
3870
3871         if (stack_slot_is_managed_mutability_pointer (dest))
3872                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with cpobj at 0x%04x", ctx->ip_offset));
3873
3874         if (!verify_type_compatibility (ctx, type, mono_type_get_type_byval (src->type)))
3875                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Token and source types of cpobj don't match at 0x%04x", ctx->ip_offset));
3876
3877         if (!verify_type_compatibility (ctx, mono_type_get_type_byval (dest->type), type))
3878                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Destination and token types of cpobj don't match at 0x%04x", ctx->ip_offset));
3879 }
3880
3881 static void
3882 do_initobj (VerifyContext *ctx, int token)
3883 {
3884         ILStackDesc *obj;
3885         MonoType *stack, *type = get_boxable_mono_type (ctx, token, "initobj");
3886         if (!type)
3887                 return;
3888
3889         if (!check_underflow (ctx, 1))
3890                 return;
3891
3892         obj = stack_pop (ctx);
3893
3894         if (!stack_slot_is_managed_pointer (obj))
3895                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid object address for initobj at 0x%04x", ctx->ip_offset));
3896
3897         if (stack_slot_is_managed_mutability_pointer (obj))
3898                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with initobj at 0x%04x", ctx->ip_offset));
3899
3900         stack = mono_type_get_type_byval (obj->type);
3901         if (MONO_TYPE_IS_REFERENCE (stack)) {
3902                 if (!verify_type_compatibility (ctx, stack, type))
3903                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type token of initobj not compatible with value on stack at 0x%04x", ctx->ip_offset));
3904                 else if (IS_STRICT_MODE (ctx) && !mono_metadata_type_equal (type, stack))
3905                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type token of initobj not compatible with value on stack at 0x%04x", ctx->ip_offset));
3906         } else if (!verify_type_compatibility (ctx, stack, type)) {
3907                 char *expected_name = mono_type_full_name (type);
3908                 char *stack_name = mono_type_full_name (stack);
3909
3910                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Initobj %s not compatible with value on stack %s at 0x%04x", expected_name, stack_name, ctx->ip_offset));
3911                 g_free (expected_name);
3912                 g_free (stack_name);
3913         }
3914 }
3915
3916 static void
3917 do_newobj (VerifyContext *ctx, int token)
3918 {
3919         ILStackDesc *value;
3920         int i;
3921         MonoMethodSignature *sig;
3922         MonoMethod *method;
3923         gboolean is_delegate = FALSE;
3924
3925         if (!(method = verifier_load_method (ctx, token, "newobj")))
3926                 return;
3927
3928         if (!mono_method_is_constructor (method)) {
3929                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method from token 0x%08x not a constructor at 0x%04x", token, ctx->ip_offset));
3930                 return;
3931         }
3932
3933         if (method->klass->flags & (TYPE_ATTRIBUTE_ABSTRACT | TYPE_ATTRIBUTE_INTERFACE))
3934                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Trying to instantiate an abstract or interface type at 0x%04x", ctx->ip_offset));
3935
3936         if (!mono_method_can_access_method_full (ctx->method, method, NULL)) {
3937                 char *from = mono_method_full_name (ctx->method, TRUE);
3938                 char *to = mono_method_full_name (method, TRUE);
3939                 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Constructor %s not visible from %s at 0x%04x", to, from, ctx->ip_offset), MONO_EXCEPTION_METHOD_ACCESS);
3940                 g_free (from);
3941                 g_free (to);
3942         }
3943
3944         //FIXME use mono_method_get_signature_full
3945         sig = mono_method_signature (method);
3946         if (!check_underflow (ctx, sig->param_count))
3947                 return;
3948
3949         is_delegate = method->klass->parent == mono_defaults.multicastdelegate_class;
3950
3951         if (is_delegate) {
3952                 ILStackDesc *funptr;
3953                 //first arg is object, second arg is fun ptr
3954                 if (sig->param_count != 2) {
3955                         ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid delegate constructor at 0x%04x", ctx->ip_offset));
3956                         return;
3957                 }
3958                 funptr = stack_pop (ctx);
3959                 value = stack_pop (ctx);
3960                 verify_delegate_compatibility (ctx, method->klass, value, funptr);
3961         } else {
3962                 for (i = sig->param_count - 1; i >= 0; --i) {
3963                         VERIFIER_DEBUG ( printf ("verifying constructor argument %d\n", i); );
3964                         value = stack_pop (ctx);
3965                         if (!verify_stack_type_compatibility (ctx, sig->params [i], value)) {
3966                                 char *stack_name = stack_slot_full_name (value);
3967                                 char *sig_name = mono_type_full_name (sig->params [i]);
3968                                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible parameter value with constructor signature: %s X %s at 0x%04x", sig_name, stack_name, ctx->ip_offset));
3969                                 g_free (stack_name);
3970                                 g_free (sig_name);
3971                         }
3972
3973                         if (stack_slot_is_managed_mutability_pointer (value))
3974                                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer as argument of newobj at 0x%04x", ctx->ip_offset));
3975                 }
3976         }
3977
3978         if (check_overflow (ctx))
3979                 set_stack_value (ctx, stack_push (ctx),  &method->klass->byval_arg, FALSE);
3980 }
3981
3982 static void
3983 do_cast (VerifyContext *ctx, int token, const char *opcode) {
3984         ILStackDesc *value;
3985         MonoType *type;
3986         gboolean is_boxed;
3987         gboolean do_box;
3988
3989         if (!check_underflow (ctx, 1))
3990                 return;
3991
3992         if (!(type = verifier_load_type (ctx, token, opcode)))
3993                 return;
3994
3995         if (type->byref) {
3996                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid %s type at 0x%04x", opcode, ctx->ip_offset));
3997                 return;
3998         }
3999
4000         value = stack_pop (ctx);
4001         is_boxed = stack_slot_is_boxed_value (value);
4002
4003         if (stack_slot_is_managed_pointer (value))
4004                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value for %s at 0x%04x", opcode, ctx->ip_offset));
4005         else if (!MONO_TYPE_IS_REFERENCE  (value->type) && !is_boxed) {
4006                 char *name = stack_slot_full_name (value);
4007                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Expected a reference type on stack for %s but found %s at 0x%04x", opcode, name, ctx->ip_offset));
4008                 g_free (name);
4009         }
4010
4011         switch (value->type->type) {
4012         case MONO_TYPE_FNPTR:
4013         case MONO_TYPE_PTR:
4014         case MONO_TYPE_TYPEDBYREF:
4015                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value for %s at 0x%04x", opcode, ctx->ip_offset));
4016         }
4017
4018         do_box = is_boxed || mono_type_is_generic_argument(type) || mono_class_from_mono_type (type)->valuetype;
4019         stack_push_val (ctx, TYPE_COMPLEX | (do_box ? BOXED_MASK : 0), type);
4020 }
4021
4022 static MonoType *
4023 mono_type_from_opcode (int opcode) {
4024         switch (opcode) {
4025         case CEE_LDIND_I1:
4026         case CEE_LDIND_U1:
4027         case CEE_STIND_I1:
4028         case CEE_LDELEM_I1:
4029         case CEE_LDELEM_U1:
4030         case CEE_STELEM_I1:
4031                 return &mono_defaults.sbyte_class->byval_arg;
4032
4033         case CEE_LDIND_I2:
4034         case CEE_LDIND_U2:
4035         case CEE_STIND_I2:
4036         case CEE_LDELEM_I2:
4037         case CEE_LDELEM_U2:
4038         case CEE_STELEM_I2:
4039                 return &mono_defaults.int16_class->byval_arg;
4040
4041         case CEE_LDIND_I4:
4042         case CEE_LDIND_U4:
4043         case CEE_STIND_I4:
4044         case CEE_LDELEM_I4:
4045         case CEE_LDELEM_U4:
4046         case CEE_STELEM_I4:
4047                 return &mono_defaults.int32_class->byval_arg;
4048
4049         case CEE_LDIND_I8:
4050         case CEE_STIND_I8:
4051         case CEE_LDELEM_I8:
4052         case CEE_STELEM_I8:
4053                 return &mono_defaults.int64_class->byval_arg;
4054
4055         case CEE_LDIND_R4:
4056         case CEE_STIND_R4:
4057         case CEE_LDELEM_R4:
4058         case CEE_STELEM_R4:
4059                 return &mono_defaults.single_class->byval_arg;
4060
4061         case CEE_LDIND_R8:
4062         case CEE_STIND_R8:
4063         case CEE_LDELEM_R8:
4064         case CEE_STELEM_R8:
4065                 return &mono_defaults.double_class->byval_arg;
4066
4067         case CEE_LDIND_I:
4068         case CEE_STIND_I:
4069         case CEE_LDELEM_I:
4070         case CEE_STELEM_I:
4071                 return &mono_defaults.int_class->byval_arg;
4072
4073         case CEE_LDIND_REF:
4074         case CEE_STIND_REF:
4075         case CEE_LDELEM_REF:
4076         case CEE_STELEM_REF:
4077                 return &mono_defaults.object_class->byval_arg;
4078
4079         default:
4080                 g_error ("unknown opcode %02x in mono_type_from_opcode ", opcode);
4081                 return NULL;
4082         }
4083 }
4084
4085 static void
4086 do_load_indirect (VerifyContext *ctx, int opcode)
4087 {
4088         ILStackDesc *value;
4089         CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
4090
4091         if (!check_underflow (ctx, 1))
4092                 return;
4093
4094         value = stack_pop (ctx);
4095         if (!stack_slot_is_managed_pointer (value)) {
4096                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Load indirect not using a manager pointer at 0x%04x", ctx->ip_offset));
4097                 set_stack_value (ctx, stack_push (ctx), mono_type_from_opcode (opcode), FALSE);
4098                 return;
4099         }
4100
4101         if (opcode == CEE_LDIND_REF) {
4102                 if (stack_slot_get_underlying_type (value) != TYPE_COMPLEX || mono_class_from_mono_type (value->type)->valuetype)
4103                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for ldind_ref expected object byref operation at 0x%04x", ctx->ip_offset));
4104                 set_stack_value (ctx, stack_push (ctx), mono_type_get_type_byval (value->type), FALSE);
4105         } else {
4106                 if (!verify_type_compatibility_full (ctx, mono_type_from_opcode (opcode), mono_type_get_type_byval (value->type), TRUE))
4107                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for ldind 0x%x operation at 0x%04x", opcode, ctx->ip_offset));
4108                 set_stack_value (ctx, stack_push (ctx), mono_type_from_opcode (opcode), FALSE);
4109         }
4110 }
4111
4112 static void
4113 do_store_indirect (VerifyContext *ctx, int opcode)
4114 {
4115         ILStackDesc *addr, *val;
4116         CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
4117
4118         if (!check_underflow (ctx, 2))
4119                 return;
4120
4121         val = stack_pop (ctx);
4122         addr = stack_pop (ctx);
4123
4124         check_unmanaged_pointer (ctx, addr);
4125
4126         if (!stack_slot_is_managed_pointer (addr) && stack_slot_get_type (addr) != TYPE_PTR) {
4127                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid non-pointer argument to stind at 0x%04x", ctx->ip_offset));
4128                 return;
4129         }
4130
4131         if (stack_slot_is_managed_mutability_pointer (addr)) {
4132                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with stind at 0x%04x", ctx->ip_offset));
4133                 return;
4134         }
4135
4136         if (!verify_type_compatibility_full (ctx, mono_type_from_opcode (opcode), mono_type_get_type_byval (addr->type), TRUE))
4137                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid addr type at stack for stind 0x%x operation at 0x%04x", opcode, ctx->ip_offset));
4138
4139         if (!verify_stack_type_compatibility (ctx, mono_type_from_opcode (opcode), val))
4140                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value type at stack for stind 0x%x operation at 0x%04x", opcode, ctx->ip_offset));
4141 }
4142
4143 static void
4144 do_newarr (VerifyContext *ctx, int token)
4145 {
4146         ILStackDesc *value;
4147         MonoType *type = get_boxable_mono_type (ctx, token, "newarr");
4148
4149         if (!type)
4150                 return;
4151
4152         if (!check_underflow (ctx, 1))
4153                 return;
4154
4155         value = stack_pop (ctx);
4156         if (stack_slot_get_type (value) != TYPE_I4 && stack_slot_get_type (value) != TYPE_NATIVE_INT)
4157                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Array size type on stack (%s) is not a verifiable type at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
4158
4159         set_stack_value (ctx, stack_push (ctx), mono_class_get_type (mono_array_class_get (mono_class_from_mono_type (type), 1)), FALSE);
4160 }
4161
4162 /*FIXME handle arrays that are not 0-indexed*/
4163 static void
4164 do_ldlen (VerifyContext *ctx)
4165 {
4166         ILStackDesc *value;
4167
4168         if (!check_underflow (ctx, 1))
4169                 return;
4170
4171         value = stack_pop (ctx);
4172
4173         if (stack_slot_get_type (value) != TYPE_COMPLEX || value->type->type != MONO_TYPE_SZARRAY)
4174                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type for ldlen at 0x%04x", ctx->ip_offset));
4175
4176         stack_push_val (ctx, TYPE_NATIVE_INT, &mono_defaults.int_class->byval_arg);
4177 }
4178
4179 /*FIXME handle arrays that are not 0-indexed*/
4180 /*FIXME handle readonly prefix and CMMP*/
4181 static void
4182 do_ldelema (VerifyContext *ctx, int klass_token)
4183 {
4184         ILStackDesc *index, *array, *res;
4185         MonoType *type = get_boxable_mono_type (ctx, klass_token, "ldelema");
4186         gboolean valid;
4187
4188         if (!type)
4189                 return;
4190
4191         if (!check_underflow (ctx, 2))
4192                 return;
4193
4194         index = stack_pop (ctx);
4195         array = stack_pop (ctx);
4196
4197         if (stack_slot_get_type (index) != TYPE_I4 && stack_slot_get_type (index) != TYPE_NATIVE_INT)
4198                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Index type(%s) for ldelema is not an int or a native int at 0x%04x", stack_slot_get_name (index), ctx->ip_offset));
4199
4200         if (!stack_slot_is_null_literal (array)) {
4201                 if (stack_slot_get_type (array) != TYPE_COMPLEX || array->type->type != MONO_TYPE_SZARRAY)
4202                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type(%s) for ldelema at 0x%04x", stack_slot_get_name (array), ctx->ip_offset));
4203                 else {
4204                         if (get_stack_type (type) == TYPE_I4 || get_stack_type (type) == TYPE_NATIVE_INT) {
4205                                         valid = verify_type_compatibility_full (ctx, type, &array->type->data.klass->byval_arg, TRUE);
4206                         } else {
4207                                 valid = mono_metadata_type_equal (type, &array->type->data.klass->byval_arg);
4208                         }
4209                         if (!valid)
4210                                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type on stack for ldelema at 0x%04x", ctx->ip_offset));
4211                 }
4212         }
4213
4214         res = stack_push (ctx);
4215         set_stack_value (ctx, res, type, TRUE);
4216         if (ctx->prefix_set & PREFIX_READONLY) {
4217                 ctx->prefix_set &= ~PREFIX_READONLY;
4218                 res->stype |= CMMP_MASK;
4219         }
4220 }
4221
4222 /*
4223  * FIXME handle arrays that are not 0-indexed
4224  * FIXME handle readonly prefix and CMMP
4225  */
4226 static void
4227 do_ldelem (VerifyContext *ctx, int opcode, int token)
4228 {
4229 #define IS_ONE_OF2(T, A, B) (T == A || T == B)
4230         ILStackDesc *index, *array;
4231         MonoType *type;
4232         if (!check_underflow (ctx, 2))
4233                 return;
4234
4235         if (opcode == CEE_LDELEM) {
4236                 if (!(type = verifier_load_type (ctx, token, "ldelem.any"))) {
4237                         ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Type (0x%08x) not found at 0x%04x", token, ctx->ip_offset));
4238                         return;
4239                 }
4240         } else {
4241                 type = mono_type_from_opcode (opcode);
4242         }
4243
4244         index = stack_pop (ctx);
4245         array = stack_pop (ctx);
4246
4247         if (stack_slot_get_type (index) != TYPE_I4 && stack_slot_get_type (index) != TYPE_NATIVE_INT)
4248                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Index type(%s) for ldelem.X is not an int or a native int at 0x%04x", stack_slot_get_name (index), ctx->ip_offset));
4249
4250         if (!stack_slot_is_null_literal (array)) {
4251                 if (stack_slot_get_type (array) != TYPE_COMPLEX || array->type->type != MONO_TYPE_SZARRAY)
4252                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type(%s) for ldelem.X at 0x%04x", stack_slot_get_name (array), ctx->ip_offset));
4253                 else {
4254                         if (opcode == CEE_LDELEM_REF) {
4255                                 if (array->type->data.klass->valuetype)
4256                                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type is not a reference type for ldelem.ref 0x%04x", ctx->ip_offset));
4257                                 type = &array->type->data.klass->byval_arg;
4258                         } else {
4259                                 MonoType *candidate = &array->type->data.klass->byval_arg;
4260                                 if (IS_STRICT_MODE (ctx)) {
4261                                         MonoType *underlying_type = mono_type_get_underlying_type_any (type);
4262                                         MonoType *underlying_candidate = mono_type_get_underlying_type_any (candidate);
4263                                         if ((IS_ONE_OF2 (underlying_type->type, MONO_TYPE_I4, MONO_TYPE_U4) && IS_ONE_OF2 (underlying_candidate->type, MONO_TYPE_I, MONO_TYPE_U)) ||
4264                                                 (IS_ONE_OF2 (underlying_candidate->type, MONO_TYPE_I4, MONO_TYPE_U4) && IS_ONE_OF2 (underlying_type->type, MONO_TYPE_I, MONO_TYPE_U)))
4265                                                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type on stack for ldelem.X at 0x%04x", ctx->ip_offset));
4266                                 }
4267                                 if (!verify_type_compatibility_full (ctx, type, candidate, TRUE))
4268                                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type on stack for ldelem.X at 0x%04x", ctx->ip_offset));
4269                         }
4270                 }
4271         }
4272
4273         set_stack_value (ctx, stack_push (ctx), type, FALSE);
4274 #undef IS_ONE_OF2
4275 }
4276
4277 /*
4278  * FIXME handle arrays that are not 0-indexed
4279  */
4280 static void
4281 do_stelem (VerifyContext *ctx, int opcode, int token)
4282 {
4283         ILStackDesc *index, *array, *value;
4284         MonoType *type;
4285         if (!check_underflow (ctx, 3))
4286                 return;
4287
4288         if (opcode == CEE_STELEM) {
4289                 if (!(type = verifier_load_type (ctx, token, "stelem.any"))) {
4290                         ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Type (0x%08x) not found at 0x%04x", token, ctx->ip_offset));
4291                         return;
4292                 }
4293         } else {
4294                 type = mono_type_from_opcode (opcode);
4295         }
4296
4297         value = stack_pop (ctx);
4298         index = stack_pop (ctx);
4299         array = stack_pop (ctx);
4300
4301         if (stack_slot_get_type (index) != TYPE_I4 && stack_slot_get_type (index) != TYPE_NATIVE_INT)
4302                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Index type(%s) for stdelem.X is not an int or a native int at 0x%04x", stack_slot_get_name (index), ctx->ip_offset));
4303
4304         if (!stack_slot_is_null_literal (array)) {
4305                 if (stack_slot_get_type (array) != TYPE_COMPLEX || array->type->type != MONO_TYPE_SZARRAY) {
4306                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type(%s) for stelem.X at 0x%04x", stack_slot_get_name (array), ctx->ip_offset));
4307                 } else {
4308                         if (opcode == CEE_STELEM_REF) {
4309                                 if (array->type->data.klass->valuetype)
4310                                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type is not a reference type for stelem.ref 0x%04x", ctx->ip_offset));
4311                         } else if (!verify_type_compatibility_full (ctx, &array->type->data.klass->byval_arg, type, TRUE)) {
4312                                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type on stack for stdelem.X at 0x%04x", ctx->ip_offset));
4313                         }
4314                 }
4315         }
4316         if (opcode == CEE_STELEM_REF) {
4317                 if (!stack_slot_is_boxed_value (value) && mono_class_from_mono_type (value->type)->valuetype)
4318                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value is not a reference type for stelem.ref 0x%04x", ctx->ip_offset));
4319         } else if (opcode != CEE_STELEM_REF) {
4320                 if (!verify_stack_type_compatibility (ctx, type, value))
4321                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value on stack for stdelem.X at 0x%04x", ctx->ip_offset));
4322
4323                 if (stack_slot_is_boxed_value (value) && !MONO_TYPE_IS_REFERENCE (value->type) && !MONO_TYPE_IS_REFERENCE (type))
4324                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use stobj with a boxed source value that is not a reference type at 0x%04x", ctx->ip_offset));
4325
4326         }
4327 }
4328
4329 static void
4330 do_throw (VerifyContext *ctx)
4331 {
4332         ILStackDesc *exception;
4333         if (!check_underflow (ctx, 1))
4334                 return;
4335         exception = stack_pop (ctx);
4336
4337         if (!stack_slot_is_null_literal (exception) && !(stack_slot_get_type (exception) == TYPE_COMPLEX && !mono_class_from_mono_type (exception->type)->valuetype))
4338                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type on stack for throw, expected reference type at 0x%04x", ctx->ip_offset));
4339
4340         if (mono_type_is_generic_argument (exception->type) && !stack_slot_is_boxed_value (exception)) {
4341                 char *name = mono_type_full_name (exception->type);
4342                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type on stack for throw, expected reference type but found unboxed %s  at 0x%04x ", name, ctx->ip_offset));
4343                 g_free (name);
4344         }
4345         /*The stack is left empty after a throw*/
4346         ctx->eval.size = 0;
4347 }
4348
4349
4350 static void
4351 do_endfilter (VerifyContext *ctx)
4352 {
4353         MonoExceptionClause *clause;
4354
4355         if (IS_STRICT_MODE (ctx)) {
4356                 if (ctx->eval.size != 1)
4357                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Stack size must have one item for endfilter at 0x%04x", ctx->ip_offset));
4358
4359                 if (ctx->eval.size >= 1 && stack_slot_get_type (stack_pop (ctx)) != TYPE_I4)
4360                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Stack item type is not an int32 for endfilter at 0x%04x", ctx->ip_offset));
4361         }
4362
4363         if ((clause = is_correct_endfilter (ctx, ctx->ip_offset))) {
4364                 if (IS_STRICT_MODE (ctx)) {
4365                         if (ctx->ip_offset != clause->handler_offset - 2)
4366                                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("endfilter is not the last instruction of the filter clause at 0x%04x", ctx->ip_offset));
4367                 } else {
4368                         if ((ctx->ip_offset != clause->handler_offset - 2) && !MONO_OFFSET_IN_HANDLER (clause, ctx->ip_offset))
4369                                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("endfilter is not the last instruction of the filter clause at 0x%04x", ctx->ip_offset));
4370                 }
4371         } else {
4372                 if (IS_STRICT_MODE (ctx) && !is_unverifiable_endfilter (ctx, ctx->ip_offset))
4373                         ADD_VERIFY_ERROR (ctx, g_strdup_printf ("endfilter outside filter clause at 0x%04x", ctx->ip_offset));
4374                 else
4375                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("endfilter outside filter clause at 0x%04x", ctx->ip_offset));
4376         }
4377
4378         ctx->eval.size = 0;
4379 }
4380
4381 static void
4382 do_leave (VerifyContext *ctx, int delta)
4383 {
4384         int target = ((gint32)ctx->ip_offset) + delta;
4385         if (target >= ctx->code_size || target < 0)
4386                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target out of code at 0x%04x", ctx->ip_offset));
4387
4388         if (!is_correct_leave (ctx->header, ctx->ip_offset, target))
4389                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Leave not allowed in finally block at 0x%04x", ctx->ip_offset));
4390         ctx->eval.size = 0;
4391 }
4392
4393 /*
4394  * do_static_branch:
4395  *
4396  * Verify br and br.s opcodes.
4397  */
4398 static void
4399 do_static_branch (VerifyContext *ctx, int delta)
4400 {
4401         int target = ctx->ip_offset + delta;
4402         if (target < 0 || target >= ctx->code_size) {
4403                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("branch target out of code at 0x%04x", ctx->ip_offset));
4404                 return;
4405         }
4406
4407         switch (is_valid_branch_instruction (ctx->header, ctx->ip_offset, target)) {
4408         case 1:
4409                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
4410                 break;
4411         case 2:
4412                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
4413                 break;
4414         }
4415
4416         ctx->target = target;
4417 }
4418
4419 static void
4420 do_switch (VerifyContext *ctx, int count, const unsigned char *data)
4421 {
4422         int i, base = ctx->ip_offset + 5 + count * 4;
4423         ILStackDesc *value;
4424
4425         if (!check_underflow (ctx, 1))
4426                 return;
4427
4428         value = stack_pop (ctx);
4429
4430         if (stack_slot_get_type (value) != TYPE_I4 && stack_slot_get_type (value) != TYPE_NATIVE_INT)
4431                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid argument to switch at 0x%04x", ctx->ip_offset));
4432
4433         for (i = 0; i < count; ++i) {
4434                 int target = base + read32 (data + i * 4);
4435
4436                 if (target < 0 || target >= ctx->code_size) {
4437                         ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Switch target %x out of code at 0x%04x", i, ctx->ip_offset));
4438                         return;
4439                 }
4440
4441                 switch (is_valid_branch_instruction (ctx->header, ctx->ip_offset, target)) {
4442                 case 1:
4443                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Switch target %x escapes out of exception block at 0x%04x", i, ctx->ip_offset));
4444                         break;
4445                 case 2:
4446                         ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Switch target %x escapes out of exception block at 0x%04x", i, ctx->ip_offset));
4447                         return;
4448                 }
4449                 merge_stacks (ctx, &ctx->eval, &ctx->code [target], FALSE, TRUE);
4450         }
4451 }
4452
4453 static void
4454 do_load_function_ptr (VerifyContext *ctx, guint32 token, gboolean virtual)
4455 {
4456         ILStackDesc *top;
4457         MonoMethod *method;
4458
4459         if (virtual && !check_underflow (ctx, 1))
4460                 return;
4461
4462         if (!virtual && !check_overflow (ctx))
4463                 return;
4464
4465         if (!IS_METHOD_DEF_OR_REF_OR_SPEC (token) || !token_bounds_check (ctx->image, token)) {
4466                 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid token %x for ldftn  at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
4467                 return;
4468         }
4469
4470         if (!(method = verifier_load_method (ctx, token, virtual ? "ldvirtfrn" : "ldftn")))
4471                 return;
4472
4473         if (mono_method_is_constructor (method))
4474                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use ldftn with a constructor at 0x%04x", ctx->ip_offset));
4475
4476         if (virtual) {
4477                 ILStackDesc *top = stack_pop (ctx);
4478
4479                 if (stack_slot_get_type (top) != TYPE_COMPLEX || top->type->type == MONO_TYPE_VALUETYPE)
4480                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid argument to ldvirtftn at 0x%04x", ctx->ip_offset));
4481
4482                 if (method->flags & METHOD_ATTRIBUTE_STATIC)
4483                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use ldvirtftn with a constructor at 0x%04x", ctx->ip_offset));
4484
4485                 if (!verify_stack_type_compatibility (ctx, &method->klass->byval_arg, top))
4486                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Unexpected object for ldvirtftn at 0x%04x", ctx->ip_offset));
4487         }
4488
4489         if (!mono_method_can_access_method_full (ctx->method, method, NULL))
4490                 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Loaded method is not visible for ldftn/ldvirtftn at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_METHOD_ACCESS);
4491
4492         top = stack_push_val(ctx, TYPE_PTR, mono_type_create_fnptr_from_mono_method (ctx, method));
4493         top->method = method;
4494 }
4495
4496 static void
4497 do_sizeof (VerifyContext *ctx, int token)
4498 {
4499         MonoType *type;
4500
4501         if (!IS_TYPE_DEF_OR_REF_OR_SPEC (token) || !token_bounds_check (ctx->image, token)) {
4502                 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid type token %x at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
4503                 return;
4504         }
4505
4506         if (!(type = verifier_load_type (ctx, token, "sizeof")))
4507                 return;
4508
4509         if (type->byref && type->type != MONO_TYPE_TYPEDBYREF) {
4510                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid use of byref type at 0x%04x", ctx->ip_offset));
4511                 return;
4512         }
4513
4514         if (type->type == MONO_TYPE_VOID) {
4515                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid use of void type at 0x%04x", ctx->ip_offset));
4516                 return;
4517         }
4518
4519         if (check_overflow (ctx))
4520                 set_stack_value (ctx, stack_push (ctx), &mono_defaults.uint32_class->byval_arg, FALSE);
4521 }
4522
4523 /* Stack top can be of any type, the runtime doesn't care and treat everything as an int. */
4524 static void
4525 do_localloc (VerifyContext *ctx)
4526 {
4527         ILStackDesc *top;
4528
4529         if (ctx->eval.size != 1) {
4530                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Stack must have only size item in localloc at 0x%04x", ctx->ip_offset));
4531                 return;
4532         }
4533
4534         if (in_any_exception_block (ctx->header, ctx->ip_offset)) {
4535                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Stack must have only size item in localloc at 0x%04x", ctx->ip_offset));
4536                 return;
4537         }
4538
4539         /*TODO verify top type*/
4540         top = stack_pop (ctx);
4541
4542         set_stack_value (ctx, stack_push (ctx), &mono_defaults.int_class->byval_arg, FALSE);
4543         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Instruction localloc in never verifiable at 0x%04x", ctx->ip_offset));
4544 }
4545
4546 static void
4547 do_ldstr (VerifyContext *ctx, guint32 token)
4548 {
4549         if (mono_metadata_token_code (token) != MONO_TOKEN_STRING) {
4550                 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid string token %x at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
4551                 return;
4552         }
4553
4554         if (!ctx->image->dynamic && mono_metadata_token_index (token) >= ctx->image->heap_us.size) {
4555                 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid string index %x at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
4556                 return;
4557         }
4558
4559         if (check_overflow (ctx))
4560                 stack_push_val (ctx, TYPE_COMPLEX,  &mono_defaults.string_class->byval_arg);
4561 }
4562
4563 static void
4564 do_refanyval (VerifyContext *ctx, int token)
4565 {
4566         ILStackDesc *top;
4567         MonoType *type;
4568         if (!check_underflow (ctx, 1))
4569                 return;
4570
4571         if (!(type = get_boxable_mono_type (ctx, token, "refanyval")))
4572                 return;
4573
4574         top = stack_pop (ctx);
4575
4576         if (top->stype != TYPE_PTR || top->type->type != MONO_TYPE_TYPEDBYREF)
4577                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Expected a typedref as argument for refanyval, but found %s at 0x%04x", stack_slot_get_name (top), ctx->ip_offset));
4578
4579         set_stack_value (ctx, stack_push (ctx), type, TRUE);
4580 }
4581
4582 static void
4583 do_refanytype (VerifyContext *ctx)
4584 {
4585         ILStackDesc *top;
4586
4587         if (!check_underflow (ctx, 1))
4588                 return;
4589
4590         top = stack_pop (ctx);
4591
4592         if (top->stype != TYPE_PTR || top->type->type != MONO_TYPE_TYPEDBYREF)
4593                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Expected a typedref as argument for refanytype, but found %s at 0x%04x", stack_slot_get_name (top), ctx->ip_offset));
4594
4595         set_stack_value (ctx, stack_push (ctx), &mono_defaults.typehandle_class->byval_arg, FALSE);
4596
4597 }
4598
4599 static void
4600 do_mkrefany (VerifyContext *ctx, int token)
4601 {
4602         ILStackDesc *top;
4603         MonoType *type;
4604         if (!check_underflow (ctx, 1))
4605                 return;
4606
4607         if (!(type = get_boxable_mono_type (ctx, token, "refanyval")))
4608                 return;
4609
4610         top = stack_pop (ctx);
4611
4612         if (stack_slot_is_managed_mutability_pointer (top))
4613                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with mkrefany at 0x%04x", ctx->ip_offset));
4614
4615         if (!stack_slot_is_managed_pointer (top)) {
4616                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Expected a managed pointer for mkrefany, but found %s at 0x%04x", stack_slot_get_name (top), ctx->ip_offset));
4617         }else {
4618                 MonoType *stack_type = mono_type_get_type_byval (top->type);
4619                 if (MONO_TYPE_IS_REFERENCE (type) && !mono_metadata_type_equal (type, stack_type))
4620                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type not compatible for mkrefany at 0x%04x", ctx->ip_offset));
4621
4622                 if (!MONO_TYPE_IS_REFERENCE (type) && !verify_type_compatibility_full (ctx, type, stack_type, TRUE))
4623                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type not compatible for mkrefany at 0x%04x", ctx->ip_offset));
4624         }
4625
4626         set_stack_value (ctx, stack_push (ctx), &mono_defaults.typed_reference_class->byval_arg, FALSE);
4627 }
4628
4629 static void
4630 do_ckfinite (VerifyContext *ctx)
4631 {
4632         ILStackDesc *top;
4633         if (!check_underflow (ctx, 1))
4634                 return;
4635
4636         top = stack_pop (ctx);
4637
4638         if (stack_slot_get_underlying_type (top) != TYPE_R8)
4639                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Expected float32 or float64 on stack for ckfinit but found %s at 0x%04x", stack_slot_get_name (top), ctx->ip_offset));
4640         stack_push_stack_val (ctx, top);
4641 }
4642 /*
4643  * merge_stacks:
4644  * Merge the stacks and perform compat checks. The merge check if types of @from are mergeable with type of @to
4645  *
4646  * @from holds new values for a given control path
4647  * @to holds the current values of a given control path
4648  *
4649  * TODO we can eliminate the from argument as all callers pass &ctx->eval
4650  */
4651 static void
4652 merge_stacks (VerifyContext *ctx, ILCodeDesc *from, ILCodeDesc *to, gboolean start, gboolean external)
4653 {
4654         int i, j, k;
4655         stack_init (ctx, to);
4656
4657         if (start) {
4658                 if (to->flags == IL_CODE_FLAG_NOT_PROCESSED)
4659                         from->size = 0;
4660                 else
4661                         stack_copy (&ctx->eval, to);
4662                 goto end_verify;
4663         } else if (!(to->flags & IL_CODE_STACK_MERGED)) {
4664                 stack_copy (to, &ctx->eval);
4665                 goto end_verify;
4666         }
4667         VERIFIER_DEBUG ( printf ("performing stack merge %d x %d\n", from->size, to->size); );
4668
4669         if (from->size != to->size) {
4670                 VERIFIER_DEBUG ( printf ("different stack sizes %d x %d at 0x%04x\n", from->size, to->size, ctx->ip_offset); );
4671                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Could not merge stacks, different sizes (%d x %d) at 0x%04x", from->size, to->size, ctx->ip_offset));
4672                 goto end_verify;
4673         }
4674
4675         //FIXME we need to preserve CMMP attributes
4676         //FIXME we must take null literals into consideration.
4677         for (i = 0; i < from->size; ++i) {
4678                 ILStackDesc *new_slot = from->stack + i;
4679                 ILStackDesc *old_slot = to->stack + i;
4680                 MonoType *new_type = mono_type_from_stack_slot (new_slot);
4681                 MonoType *old_type = mono_type_from_stack_slot (old_slot);
4682                 MonoClass *old_class = mono_class_from_mono_type (old_type);
4683                 MonoClass *new_class = mono_class_from_mono_type (new_type);
4684                 MonoClass *match_class = NULL;
4685
4686                 // S := T then U = S (new value is compatible with current value, keep current)
4687                 if (verify_stack_type_compatibility (ctx, old_type, new_slot)) {
4688                         copy_stack_value (new_slot, old_slot);
4689                         continue;
4690                 }
4691
4692                 // T := S then U = T (old value is compatible with current value, use new)
4693                 if (verify_stack_type_compatibility (ctx, new_type, old_slot)) {
4694                         copy_stack_value (old_slot, new_slot);
4695                         continue;
4696                 }
4697
4698                 if (mono_type_is_generic_argument (old_type) || mono_type_is_generic_argument (new_type)) {
4699                         char *old_name = stack_slot_full_name (old_slot);
4700                         char *new_name = stack_slot_full_name (new_slot);
4701                         CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Could not merge stack at depth %d, types not compatible: %s X %s at 0x%04x", i, old_name, new_name, ctx->ip_offset));
4702                         g_free (old_name);
4703                         g_free (new_name);
4704                         goto end_verify;
4705                 }
4706
4707                 //both are reference types, use closest common super type
4708                 if (!mono_class_from_mono_type (old_type)->valuetype
4709                         && !mono_class_from_mono_type (new_type)->valuetype
4710                         && !stack_slot_is_managed_pointer (old_slot)
4711                         && !stack_slot_is_managed_pointer (new_slot)) {
4712
4713                         for (j = MIN (old_class->idepth, new_class->idepth) - 1; j > 0; --j) {
4714                                 if (mono_metadata_type_equal (&old_class->supertypes [j]->byval_arg, &new_class->supertypes [j]->byval_arg)) {
4715                                         match_class = old_class->supertypes [j];
4716                                         goto match_found;
4717                                 }
4718                         }
4719
4720                         mono_class_setup_interfaces (old_class);
4721                         for (j = 0; j < old_class->interface_count; ++j) {
4722                                 for (k = 0; k < new_class->interface_count; ++k) {
4723                                         if (mono_metadata_type_equal (&old_class->interfaces [j]->byval_arg, &new_class->interfaces [k]->byval_arg)) {
4724                                                 match_class = old_class->interfaces [j];
4725                                                 goto match_found;
4726                                         }
4727                                 }
4728                         }
4729
4730                         //No decent super type found, use object
4731                         match_class = mono_defaults.object_class;
4732                         goto match_found;
4733                 } else if (is_compatible_boxed_valuetype (ctx,old_type, new_type, new_slot, FALSE) || is_compatible_boxed_valuetype (ctx, new_type, old_type, old_slot, FALSE)) {
4734                         match_class = mono_defaults.object_class;
4735                         goto match_found;
4736                 }
4737
4738                 {
4739                 char *old_name = stack_slot_full_name (old_slot);
4740                 char *new_name = stack_slot_full_name (new_slot);
4741                 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Could not merge stack at depth %d, types not compatible: %s X %s at 0x%04x", i, old_name, new_name, ctx->ip_offset));
4742                 g_free (old_name);
4743                 g_free (new_name);
4744                 }
4745                 set_stack_value (ctx, old_slot, &new_class->byval_arg, stack_slot_is_managed_pointer (old_slot));
4746                 goto end_verify;
4747
4748 match_found:
4749                 g_assert (match_class);
4750                 set_stack_value (ctx, old_slot, &match_class->byval_arg, stack_slot_is_managed_pointer (old_slot));
4751                 set_stack_value (ctx, new_slot, &match_class->byval_arg, stack_slot_is_managed_pointer (old_slot));
4752                 continue;
4753         }
4754
4755 end_verify:
4756         if (external)
4757                 to->flags |= IL_CODE_FLAG_WAS_TARGET;
4758         to->flags |= IL_CODE_STACK_MERGED;
4759 }
4760
4761 #define HANDLER_START(clause) ((clause)->flags == MONO_EXCEPTION_CLAUSE_FILTER ? (clause)->data.filter_offset : clause->handler_offset)
4762 #define IS_CATCH_OR_FILTER(clause) ((clause)->flags == MONO_EXCEPTION_CLAUSE_FILTER || (clause)->flags == MONO_EXCEPTION_CLAUSE_NONE)
4763
4764 /*
4765  * is_clause_in_range :
4766  *
4767  * Returns TRUE if either the protected block or the handler of @clause is in the @start - @end range.
4768  */
4769 static gboolean
4770 is_clause_in_range (MonoExceptionClause *clause, guint32 start, guint32 end)
4771 {
4772         if (clause->try_offset >= start && clause->try_offset < end)
4773                 return TRUE;
4774         if (HANDLER_START (clause) >= start && HANDLER_START (clause) < end)
4775                 return TRUE;
4776         return FALSE;
4777 }
4778
4779 /*
4780  * is_clause_inside_range :
4781  *
4782  * Returns TRUE if @clause lies completely inside the @start - @end range.
4783  */
4784 static gboolean
4785 is_clause_inside_range (MonoExceptionClause *clause, guint32 start, guint32 end)
4786 {
4787         if (clause->try_offset < start || (clause->try_offset + clause->try_len) > end)
4788                 return FALSE;
4789         if (HANDLER_START (clause) < start || (clause->handler_offset + clause->handler_len) > end)
4790                 return FALSE;
4791         return TRUE;
4792 }
4793
4794 /*
4795  * is_clause_nested :
4796  *
4797  * Returns TRUE if @nested is nested in @clause.
4798  */
4799 static gboolean
4800 is_clause_nested (MonoExceptionClause *clause, MonoExceptionClause *nested)
4801 {
4802         if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER && is_clause_inside_range (nested, clause->data.filter_offset, clause->handler_offset))
4803                 return TRUE;
4804         return is_clause_inside_range (nested, clause->try_offset, clause->try_offset + clause->try_len) ||
4805         is_clause_inside_range (nested, clause->handler_offset, clause->handler_offset + clause->handler_len);
4806 }
4807
4808 /* Test the relationship between 2 exception clauses. Follow  P.1 12.4.2.7 of ECMA
4809  * the each pair of exception must have the following properties:
4810  *  - one is fully nested on another (the outer must not be a filter clause) (the nested one must come earlier)
4811  *  - completely disjoin (none of the 3 regions of each entry overlap with the other 3)
4812  *  - mutual protection (protected block is EXACT the same, handlers are disjoin and all handler are catch or all handler are filter)
4813  */
4814 static void
4815 verify_clause_relationship (VerifyContext *ctx, MonoExceptionClause *clause, MonoExceptionClause *to_test)
4816 {
4817         /*clause is nested*/
4818         if (to_test->flags == MONO_EXCEPTION_CLAUSE_FILTER && is_clause_inside_range (clause, to_test->data.filter_offset, to_test->handler_offset)) {
4819                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Exception clause inside filter"));
4820                 return;
4821         }
4822
4823         /*wrong nesting order.*/
4824         if (is_clause_nested (clause, to_test)) {
4825                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Nested exception clause appears after enclosing clause"));
4826                 return;
4827         }
4828
4829         /*mutual protection*/
4830         if (clause->try_offset == to_test->try_offset && clause->try_len == to_test->try_len) {
4831                 /*handlers are not disjoint*/
4832                 if (is_clause_in_range (to_test, HANDLER_START (clause), clause->handler_offset + clause->handler_len)) {
4833                         ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Exception handlers overlap"));
4834                         return;
4835                 }
4836                 /* handlers are not catch or filter */
4837                 if (!IS_CATCH_OR_FILTER (clause) || !IS_CATCH_OR_FILTER (to_test)) {
4838                         ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Exception clauses with shared protected block are neither catch or filter"));
4839                         return;
4840                 }
4841                 /*OK*/
4842                 return;
4843         }
4844
4845         /*not completelly disjoint*/
4846         if ((is_clause_in_range (to_test, clause->try_offset, clause->try_offset + clause->try_len) ||
4847                 is_clause_in_range (to_test, HANDLER_START (clause), clause->handler_offset + clause->handler_len)) && !is_clause_nested (to_test, clause))
4848                 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Exception clauses overlap"));
4849 }
4850
4851 #define code_bounds_check(size) \
4852         if (ip + size > end) {\
4853                 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Code overrun starting with 0x%x at 0x%04x", *ip, ctx.ip_offset)); \
4854                 break; \
4855         } \
4856
4857 /*
4858  * FIXME: need to distinguish between valid and verifiable.
4859  * Need to keep track of types on the stack.
4860  * Verify types for opcodes.
4861  */
4862 GSList*
4863 mono_method_verify (MonoMethod *method, int level)
4864 {
4865         MonoError error;
4866         const unsigned char *ip;
4867         const unsigned char *end;
4868         int i, n, need_merge = 0, start = 0;
4869         guint token, ip_offset = 0, prefix = 0;
4870         MonoGenericContext *generic_context = NULL;
4871         MonoImage *image;
4872         VerifyContext ctx;
4873         GSList *tmp;
4874         VERIFIER_DEBUG ( printf ("Verify IL for method %s %s %s\n",  method->klass->name_space,  method->klass->name, method->name); );
4875
4876         if (method->iflags & (METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL | METHOD_IMPL_ATTRIBUTE_RUNTIME) ||
4877                         (method->flags & (METHOD_ATTRIBUTE_PINVOKE_IMPL | METHOD_ATTRIBUTE_ABSTRACT))) {
4878                 return NULL;
4879         }
4880
4881         memset (&ctx, 0, sizeof (VerifyContext));
4882
4883         //FIXME use mono_method_get_signature_full
4884         ctx.signature = mono_method_signature (method);
4885         if (!ctx.signature) {
4886                 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Could not decode method signature"));
4887                 return ctx.list;
4888         }
4889         ctx.header = mono_method_get_header (method);
4890         if (!ctx.header) {
4891                 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Could not decode method header"));
4892                 return ctx.list;
4893         }
4894         ctx.method = method;
4895         ip = ctx.header->code;
4896         end = ip + ctx.header->code_size;
4897         ctx.image = image = method->klass->image;
4898
4899
4900         ctx.max_args = ctx.signature->param_count + ctx.signature->hasthis;
4901         ctx.max_stack = ctx.header->max_stack;
4902         ctx.verifiable = ctx.valid = 1;
4903         ctx.level = level;
4904
4905         ctx.code = g_new (ILCodeDesc, ctx.header->code_size);
4906         ctx.code_size = ctx.header->code_size;
4907
4908         memset(ctx.code, 0, sizeof (ILCodeDesc) * ctx.header->code_size);
4909
4910
4911         ctx.num_locals = ctx.header->num_locals;
4912         ctx.locals = g_memdup (ctx.header->locals, sizeof (MonoType*) * ctx.header->num_locals);
4913
4914         if (ctx.num_locals > 0 && !ctx.header->init_locals)
4915                 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Method with locals variable but without init locals set"));
4916
4917         ctx.params = g_new (MonoType*, ctx.max_args);
4918         if (ctx.signature->hasthis)
4919                 ctx.params [0] = method->klass->valuetype ? &method->klass->this_arg : &method->klass->byval_arg;
4920         memcpy (ctx.params + ctx.signature->hasthis, ctx.signature->params, sizeof (MonoType *) * ctx.signature->param_count);
4921
4922         if (ctx.signature->is_inflated)
4923                 ctx.generic_context = generic_context = mono_method_get_context (method);
4924
4925         if (!generic_context && (method->klass->generic_container || method->is_generic)) {
4926                 if (method->is_generic)
4927                         ctx.generic_context = generic_context = &(mono_method_get_generic_container (method)->context);
4928                 else
4929                         ctx.generic_context = generic_context = &method->klass->generic_container->context;
4930         }
4931
4932         for (i = 0; i < ctx.num_locals; ++i) {
4933                 ctx.locals [i] = mono_class_inflate_generic_type_checked (ctx.locals [i], ctx.generic_context, &error);
4934                 if (!mono_error_ok (&error)) {
4935                         char *name = mono_type_full_name (ctx.locals [i]);
4936                         ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid local %d of type %s", i, name));
4937                         g_free (name);
4938                         mono_error_cleanup (&error);
4939                         goto cleanup;
4940                 }
4941         }
4942         for (i = 0; i < ctx.max_args; ++i) {
4943                 ctx.params [i] = mono_class_inflate_generic_type_checked (ctx.params [i], ctx.generic_context, &error);
4944                 if (!mono_error_ok (&error)) {
4945                         char *name = mono_type_full_name (ctx.locals [i]);
4946                         ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid parameter %d of type %s", i, name));
4947                         g_free (name);
4948                         mono_error_cleanup (&error);
4949                         goto cleanup;
4950                 }
4951         }
4952         stack_init (&ctx, &ctx.eval);
4953
4954         for (i = 0; i < ctx.num_locals; ++i) {
4955                 if (!mono_type_is_valid_in_context (&ctx, ctx.locals [i]))
4956                         break;
4957         }
4958
4959         for (i = 0; i < ctx.max_args; ++i) {
4960                 if (!mono_type_is_valid_in_context (&ctx, ctx.params [i]))
4961                         break;
4962         }
4963
4964         if (!ctx.valid)
4965                 goto cleanup;
4966
4967         for (i = 0; i < ctx.header->num_clauses && ctx.valid; ++i) {
4968                 MonoExceptionClause *clause = ctx.header->clauses + i;
4969                 VERIFIER_DEBUG (printf ("clause try %x len %x filter at %x handler at %x len %x\n", clause->try_offset, clause->try_len, clause->data.filter_offset, clause->handler_offset, clause->handler_len); );
4970
4971                 if (clause->try_offset > ctx.code_size || clause->try_offset + clause->try_len > ctx.code_size)
4972                         ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("try clause out of bounds at 0x%04x", clause->try_offset));
4973
4974                 if (clause->try_len <= 0)
4975                         ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("try clause len <= 0 at 0x%04x", clause->try_offset));
4976
4977                 if (clause->handler_offset > ctx.code_size || clause->handler_offset + clause->handler_len > ctx.code_size)
4978                         ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("handler clause out of bounds at 0x%04x", clause->try_offset));
4979
4980                 if (clause->handler_len <= 0)
4981                         ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("try clause len <= 0 at 0x%04x", clause->try_offset));
4982
4983                 if (clause->try_offset < clause->handler_offset && clause->try_offset + clause->try_len > HANDLER_START (clause))
4984                         ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("try block (at 0x%04x) includes handler block (at 0x%04x)", clause->try_offset, clause->handler_offset));
4985
4986                 for (n = i + 1; n < ctx.header->num_clauses && ctx.valid; ++n)
4987                         verify_clause_relationship (&ctx, clause, ctx.header->clauses + n);
4988
4989                 if (!ctx.valid)
4990                         break;
4991
4992                 ctx.code [clause->try_offset].flags |= IL_CODE_FLAG_WAS_TARGET;
4993                 if (clause->try_offset + clause->try_len < ctx.code_size)
4994                         ctx.code [clause->try_offset + clause->try_len].flags |= IL_CODE_FLAG_WAS_TARGET;
4995                 if (clause->handler_offset + clause->handler_len < ctx.code_size)
4996                         ctx.code [clause->handler_offset + clause->handler_len].flags |= IL_CODE_FLAG_WAS_TARGET;
4997
4998                 if (clause->flags == MONO_EXCEPTION_CLAUSE_NONE) {
4999                         init_stack_with_value_at_exception_boundary (&ctx, ctx.code + clause->handler_offset, clause->data.catch_class);
5000                 }
5001                 else if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
5002                         init_stack_with_value_at_exception_boundary (&ctx, ctx.code + clause->data.filter_offset, mono_defaults.exception_class);
5003                         init_stack_with_value_at_exception_boundary (&ctx, ctx.code + clause->handler_offset, mono_defaults.exception_class);
5004                 }
5005         }
5006
5007         while (ip < end && ctx.valid) {
5008                 ctx.ip_offset = ip_offset = ip - ctx.header->code;
5009
5010                 /*We need to check against fallthrou in and out of protected blocks.
5011                  * For fallout we check the once a protected block ends, if the start flag is not set.
5012                  * Likewise for fallthru in, we check if ip is the start of a protected block and start is not set
5013                  * TODO convert these checks to be done using flags and not this loop
5014                  */
5015                 for (i = 0; i < ctx.header->num_clauses && ctx.valid; ++i) {
5016                         MonoExceptionClause *clause = ctx.header->clauses + i;
5017
5018                         if ((clause->try_offset + clause->try_len == ip_offset) && start == 0) {
5019                                 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("fallthru off try block at 0x%04x", ip_offset));
5020                                 start = 1;
5021                         }
5022
5023                         if ((clause->handler_offset + clause->handler_len == ip_offset) && start == 0) {
5024                                 if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER)
5025                                         ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("fallout of handler block at 0x%04x", ip_offset));
5026                                 else
5027                                         CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("fallout of handler block at 0x%04x", ip_offset));
5028                                 start = 1;
5029                         }
5030
5031                         if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER && clause->handler_offset == ip_offset && start == 0) {
5032                                 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("fallout of filter block at 0x%04x", ip_offset));
5033                                 start = 1;
5034                         }
5035
5036                         if (clause->handler_offset == ip_offset && start == 0) {
5037                                 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("fallthru handler block at 0x%04x", ip_offset));
5038                                 start = 1;
5039                         }
5040
5041                         if (clause->try_offset == ip_offset && ctx.eval.size > 0 && start == 0) {
5042                                 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Try to enter try block with a non-empty stack at 0x%04x", ip_offset));
5043                                 start = 1;
5044                         }
5045                 }
5046
5047                 if (!ctx.valid)
5048                         break;
5049
5050                 if (need_merge) {
5051                         VERIFIER_DEBUG ( printf ("extra merge needed! 0x%04x \n", ctx.target); );
5052                         merge_stacks (&ctx, &ctx.eval, &ctx.code [ctx.target], FALSE, TRUE);
5053                         need_merge = 0;
5054                 }
5055                 merge_stacks (&ctx, &ctx.eval, &ctx.code[ip_offset], start, FALSE);
5056                 start = 0;
5057
5058                 /*TODO we can fast detect a forward branch or exception block targeting code after prefix, we should fail fast*/
5059 #ifdef MONO_VERIFIER_DEBUG
5060                 {
5061                         char *discode;
5062                         discode = mono_disasm_code_one (NULL, method, ip, NULL);
5063                         discode [strlen (discode) - 1] = 0; /* no \n */
5064                         g_print ("[%d] %-29s (%d)\n",  ip_offset, discode, ctx.eval.size);
5065                         g_free (discode);
5066                 }
5067                 dump_stack_state (&ctx.code [ip_offset]);
5068                 dump_stack_state (&ctx.eval);
5069 #endif
5070
5071                 switch (*ip) {
5072                 case CEE_NOP:
5073                 case CEE_BREAK:
5074                         ++ip;
5075                         break;
5076
5077                 case CEE_LDARG_0:
5078                 case CEE_LDARG_1:
5079                 case CEE_LDARG_2:
5080                 case CEE_LDARG_3:
5081                         push_arg (&ctx, *ip - CEE_LDARG_0, FALSE);
5082                         ++ip;
5083                         break;
5084
5085                 case CEE_LDARG_S:
5086                 case CEE_LDARGA_S:
5087                         code_bounds_check (2);
5088                         push_arg (&ctx, ip [1],  *ip == CEE_LDARGA_S);
5089                         ip += 2;
5090                         break;
5091
5092                 case CEE_ADD_OVF_UN:
5093                         do_binop (&ctx, *ip, add_ovf_un_table);
5094                         ++ip;
5095                         break;
5096
5097                 case CEE_SUB_OVF_UN:
5098                         do_binop (&ctx, *ip, sub_ovf_un_table);
5099                         ++ip;
5100                         break;
5101
5102                 case CEE_ADD_OVF:
5103                 case CEE_SUB_OVF:
5104                 case CEE_MUL_OVF:
5105                 case CEE_MUL_OVF_UN:
5106                         do_binop (&ctx, *ip, bin_ovf_table);
5107                         ++ip;
5108                         break;
5109
5110                 case CEE_ADD:
5111                         do_binop (&ctx, *ip, add_table);
5112                         ++ip;
5113                         break;
5114
5115                 case CEE_SUB:
5116                         do_binop (&ctx, *ip, sub_table);
5117                         ++ip;
5118                         break;
5119
5120                 case CEE_MUL:
5121                 case CEE_DIV:
5122                 case CEE_REM:
5123                         do_binop (&ctx, *ip, bin_op_table);
5124                         ++ip;
5125                         break;
5126
5127                 case CEE_AND:
5128                 case CEE_DIV_UN:
5129                 case CEE_OR:
5130                 case CEE_REM_UN:
5131                 case CEE_XOR:
5132                         do_binop (&ctx, *ip, int_bin_op_table);
5133                         ++ip;
5134                         break;
5135
5136                 case CEE_SHL:
5137                 case CEE_SHR:
5138                 case CEE_SHR_UN:
5139                         do_binop (&ctx, *ip, shift_op_table);
5140                         ++ip;
5141                         break;
5142
5143                 case CEE_POP:
5144                         if (!check_underflow (&ctx, 1))
5145                                 break;
5146                         stack_pop_safe (&ctx);
5147                         ++ip;
5148                         break;
5149
5150                 case CEE_RET:
5151                         do_ret (&ctx);
5152                         ++ip;
5153                         start = 1;
5154                         break;
5155
5156                 case CEE_LDLOC_0:
5157                 case CEE_LDLOC_1:
5158                 case CEE_LDLOC_2:
5159                 case CEE_LDLOC_3:
5160                         /*TODO support definite assignment verification? */
5161                         push_local (&ctx, *ip - CEE_LDLOC_0, FALSE);
5162                         ++ip;
5163                         break;
5164
5165                 case CEE_STLOC_0:
5166                 case CEE_STLOC_1:
5167                 case CEE_STLOC_2:
5168                 case CEE_STLOC_3:
5169                         store_local (&ctx, *ip - CEE_STLOC_0);
5170                         ++ip;
5171                         break;
5172
5173                 case CEE_STLOC_S:
5174                         code_bounds_check (2);
5175                         store_local (&ctx, ip [1]);
5176                         ip += 2;
5177                         break;
5178
5179                 case CEE_STARG_S:
5180                         code_bounds_check (2);
5181                         store_arg (&ctx, ip [1]);
5182                         ip += 2;
5183                         break;
5184
5185                 case CEE_LDC_I4_M1:
5186                 case CEE_LDC_I4_0:
5187                 case CEE_LDC_I4_1:
5188                 case CEE_LDC_I4_2:
5189                 case CEE_LDC_I4_3:
5190                 case CEE_LDC_I4_4:
5191                 case CEE_LDC_I4_5:
5192                 case CEE_LDC_I4_6:
5193                 case CEE_LDC_I4_7:
5194                 case CEE_LDC_I4_8:
5195                         if (check_overflow (&ctx))
5196                                 stack_push_val (&ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
5197                         ++ip;
5198                         break;
5199
5200                 case CEE_LDC_I4_S:
5201                         code_bounds_check (2);
5202                         if (check_overflow (&ctx))
5203                                 stack_push_val (&ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
5204                         ip += 2;
5205                         break;
5206
5207                 case CEE_LDC_I4:
5208                         code_bounds_check (5);
5209                         if (check_overflow (&ctx))
5210                                 stack_push_val (&ctx,TYPE_I4, &mono_defaults.int32_class->byval_arg);
5211                         ip += 5;
5212                         break;
5213
5214                 case CEE_LDC_I8:
5215                         code_bounds_check (9);
5216                         if (check_overflow (&ctx))
5217                                 stack_push_val (&ctx,TYPE_I8, &mono_defaults.int64_class->byval_arg);
5218                         ip += 9;
5219                         break;
5220
5221                 case CEE_LDC_R4:
5222                         code_bounds_check (5);
5223                         if (check_overflow (&ctx))
5224                                 stack_push_val (&ctx, TYPE_R8, &mono_defaults.double_class->byval_arg);
5225                         ip += 5;
5226                         break;
5227
5228                 case CEE_LDC_R8:
5229                         code_bounds_check (9);
5230                         if (check_overflow (&ctx))
5231                                 stack_push_val (&ctx, TYPE_R8, &mono_defaults.double_class->byval_arg);
5232                         ip += 9;
5233                         break;
5234
5235                 case CEE_LDNULL:
5236                         if (check_overflow (&ctx))
5237                                 stack_push_val (&ctx, TYPE_COMPLEX | NULL_LITERAL_MASK, &mono_defaults.object_class->byval_arg);
5238                         ++ip;
5239                         break;
5240
5241                 case CEE_BEQ_S:
5242                 case CEE_BNE_UN_S:
5243                         code_bounds_check (2);
5244                         do_branch_op (&ctx, (signed char)ip [1] + 2, cmp_br_eq_op);
5245                         ip += 2;
5246                         need_merge = 1;
5247                         break;
5248
5249                 case CEE_BGE_S:
5250                 case CEE_BGT_S:
5251                 case CEE_BLE_S:
5252                 case CEE_BLT_S:
5253                 case CEE_BGE_UN_S:
5254                 case CEE_BGT_UN_S:
5255                 case CEE_BLE_UN_S:
5256                 case CEE_BLT_UN_S:
5257                         code_bounds_check (2);
5258                         do_branch_op (&ctx, (signed char)ip [1] + 2, cmp_br_op);
5259                         ip += 2;
5260                         need_merge = 1;
5261                         break;
5262
5263                 case CEE_BEQ:
5264                 case CEE_BNE_UN:
5265                         code_bounds_check (5);
5266                         do_branch_op (&ctx, (gint32)read32 (ip + 1) + 5, cmp_br_eq_op);
5267                         ip += 5;
5268                         need_merge = 1;
5269                         break;
5270
5271                 case CEE_BGE:
5272                 case CEE_BGT:
5273                 case CEE_BLE:
5274                 case CEE_BLT:
5275                 case CEE_BGE_UN:
5276                 case CEE_BGT_UN:
5277                 case CEE_BLE_UN:
5278                 case CEE_BLT_UN:
5279                         code_bounds_check (5);
5280                         do_branch_op (&ctx, (gint32)read32 (ip + 1) + 5, cmp_br_op);
5281                         ip += 5;
5282                         need_merge = 1;
5283                         break;
5284
5285                 case CEE_LDLOC_S:
5286                 case CEE_LDLOCA_S:
5287                         code_bounds_check (2);
5288                         push_local (&ctx, ip[1], *ip == CEE_LDLOCA_S);
5289                         ip += 2;
5290                         break;
5291
5292                 /* FIXME: warn/error instead? */
5293                 case CEE_UNUSED99:
5294                         ++ip;
5295                         break;
5296
5297                 case CEE_DUP: {
5298                         ILStackDesc * top;
5299                         if (!check_underflow (&ctx, 1))
5300                                 break;
5301                         if (!check_overflow (&ctx))
5302                                 break;
5303                         top = stack_pop_safe (&ctx);
5304                         copy_stack_value (stack_push (&ctx), top);
5305                         copy_stack_value (stack_push (&ctx), top);
5306                         ++ip;
5307                         break;
5308                 }
5309
5310                 case CEE_JMP:
5311                         code_bounds_check (5);
5312                         if (ctx.eval.size)
5313                                 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Eval stack must be empty in jmp at 0x%04x", ip_offset));
5314                         token = read32 (ip + 1);
5315                         if (in_any_block (ctx.header, ip_offset))
5316                                 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("jmp cannot escape exception blocks at 0x%04x", ip_offset));
5317
5318                         CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Intruction jmp is not verifiable at 0x%04x", ctx.ip_offset));
5319                         /*
5320                          * FIXME: check signature, retval, arguments etc.
5321                          */
5322                         ip += 5;
5323                         break;
5324                 case CEE_CALL:
5325                 case CEE_CALLVIRT:
5326                         code_bounds_check (5);
5327                         do_invoke_method (&ctx, read32 (ip + 1), *ip == CEE_CALLVIRT);
5328                         ip += 5;
5329                         break;
5330
5331                 case CEE_CALLI:
5332                         code_bounds_check (5);
5333                         token = read32 (ip + 1);
5334                         /*
5335                          * FIXME: check signature, retval, arguments etc.
5336                          * FIXME: check requirements for tail call
5337                          */
5338                         CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Intruction calli is not verifiable at 0x%04x", ctx.ip_offset));
5339                         ip += 5;
5340                         break;
5341                 case CEE_BR_S:
5342                         code_bounds_check (2);
5343                         do_static_branch (&ctx, (signed char)ip [1] + 2);
5344                         need_merge = 1;
5345                         ip += 2;
5346                         start = 1;
5347                         break;
5348
5349                 case CEE_BRFALSE_S:
5350                 case CEE_BRTRUE_S:
5351                         code_bounds_check (2);
5352                         do_boolean_branch_op (&ctx, (signed char)ip [1] + 2);
5353                         ip += 2;
5354                         need_merge = 1;
5355                         break;
5356
5357                 case CEE_BR:
5358                         code_bounds_check (5);
5359                         do_static_branch (&ctx, (gint32)read32 (ip + 1) + 5);
5360                         need_merge = 1;
5361                         ip += 5;
5362                         start = 1;
5363                         break;
5364
5365                 case CEE_BRFALSE:
5366                 case CEE_BRTRUE:
5367                         code_bounds_check (5);
5368                         do_boolean_branch_op (&ctx, (gint32)read32 (ip + 1) + 5);
5369                         ip += 5;
5370                         need_merge = 1;
5371                         break;
5372
5373                 case CEE_SWITCH:
5374                         code_bounds_check (5);
5375                         n = read32 (ip + 1);
5376                         code_bounds_check (5 + sizeof (guint32) * n);
5377
5378                         do_switch (&ctx, n, (ip + 5));
5379                         start = 1;
5380                         ip += 5 + sizeof (guint32) * n;
5381                         break;
5382
5383                 case CEE_LDIND_I1:
5384                 case CEE_LDIND_U1:
5385                 case CEE_LDIND_I2:
5386                 case CEE_LDIND_U2:
5387                 case CEE_LDIND_I4:
5388                 case CEE_LDIND_U4:
5389                 case CEE_LDIND_I8:
5390                 case CEE_LDIND_I:
5391                 case CEE_LDIND_R4:
5392                 case CEE_LDIND_R8:
5393                 case CEE_LDIND_REF:
5394                         do_load_indirect (&ctx, *ip);
5395                         ++ip;
5396                         break;
5397
5398                 case CEE_STIND_REF:
5399                 case CEE_STIND_I1:
5400                 case CEE_STIND_I2:
5401                 case CEE_STIND_I4:
5402                 case CEE_STIND_I8:
5403                 case CEE_STIND_R4:
5404                 case CEE_STIND_R8:
5405                 case CEE_STIND_I:
5406                         do_store_indirect (&ctx, *ip);
5407                         ++ip;
5408                         break;
5409
5410                 case CEE_NOT:
5411                 case CEE_NEG:
5412                         do_unary_math_op (&ctx, *ip);
5413                         ++ip;
5414                         break;
5415
5416                 case CEE_CONV_I1:
5417                 case CEE_CONV_I2:
5418                 case CEE_CONV_I4:
5419                 case CEE_CONV_U1:
5420                 case CEE_CONV_U2:
5421                 case CEE_CONV_U4:
5422                         do_conversion (&ctx, TYPE_I4);
5423                         ++ip;
5424                         break;
5425
5426                 case CEE_CONV_I8:
5427                 case CEE_CONV_U8:
5428                         do_conversion (&ctx, TYPE_I8);
5429                         ++ip;
5430                         break;
5431
5432                 case CEE_CONV_R4:
5433                 case CEE_CONV_R8:
5434                 case CEE_CONV_R_UN:
5435                         do_conversion (&ctx, TYPE_R8);
5436                         ++ip;
5437                         break;
5438
5439                 case CEE_CONV_I:
5440                 case CEE_CONV_U:
5441                         do_conversion (&ctx, TYPE_NATIVE_INT);
5442                         ++ip;
5443                         break;
5444
5445                 case CEE_CPOBJ:
5446                         code_bounds_check (5);
5447                         do_cpobj (&ctx, read32 (ip + 1));
5448                         ip += 5;
5449                         break;
5450
5451                 case CEE_LDOBJ:
5452                         code_bounds_check (5);
5453                         do_ldobj_value (&ctx, read32 (ip + 1));
5454                         ip += 5;
5455                         break;
5456
5457                 case CEE_LDSTR:
5458                         code_bounds_check (5);
5459                         do_ldstr (&ctx, read32 (ip + 1));
5460                         ip += 5;
5461                         break;
5462
5463                 case CEE_NEWOBJ:
5464                         code_bounds_check (5);
5465                         do_newobj (&ctx, read32 (ip + 1));
5466                         ip += 5;
5467                         break;
5468
5469                 case CEE_CASTCLASS:
5470                 case CEE_ISINST:
5471                         code_bounds_check (5);
5472                         do_cast (&ctx, read32 (ip + 1), *ip == CEE_CASTCLASS ? "castclass" : "isinst");
5473                         ip += 5;
5474                         break;
5475
5476                 case CEE_UNUSED58:
5477                 case CEE_UNUSED1:
5478                         ++ip; /* warn, error ? */
5479                         break;
5480
5481                 case CEE_UNBOX:
5482                         code_bounds_check (5);
5483                         do_unbox_value (&ctx, read32 (ip + 1));
5484                         ip += 5;
5485                         break;
5486
5487                 case CEE_THROW:
5488                         do_throw (&ctx);
5489                         start = 1;
5490                         ++ip;
5491                         break;
5492
5493                 case CEE_LDFLD:
5494                 case CEE_LDFLDA:
5495                         code_bounds_check (5);
5496                         do_push_field (&ctx, read32 (ip + 1), *ip == CEE_LDFLDA);
5497                         ip += 5;
5498                         break;
5499
5500                 case CEE_LDSFLD:
5501                 case CEE_LDSFLDA:
5502                         code_bounds_check (5);
5503                         do_push_static_field (&ctx, read32 (ip + 1), *ip == CEE_LDSFLDA);
5504                         ip += 5;
5505                         break;
5506
5507                 case CEE_STFLD:
5508                         code_bounds_check (5);
5509                         do_store_field (&ctx, read32 (ip + 1));
5510                         ip += 5;
5511                         break;
5512
5513                 case CEE_STSFLD:
5514                         code_bounds_check (5);
5515                         do_store_static_field (&ctx, read32 (ip + 1));
5516                         ip += 5;
5517                         break;
5518
5519                 case CEE_STOBJ:
5520                         code_bounds_check (5);
5521                         do_stobj (&ctx, read32 (ip + 1));
5522                         ip += 5;
5523                         break;
5524
5525                 case CEE_CONV_OVF_I1_UN:
5526                 case CEE_CONV_OVF_I2_UN:
5527                 case CEE_CONV_OVF_I4_UN:
5528                 case CEE_CONV_OVF_U1_UN:
5529                 case CEE_CONV_OVF_U2_UN:
5530                 case CEE_CONV_OVF_U4_UN:
5531                         do_conversion (&ctx, TYPE_I4);
5532                         ++ip;
5533                         break;
5534
5535                 case CEE_CONV_OVF_I8_UN:
5536                 case CEE_CONV_OVF_U8_UN:
5537                         do_conversion (&ctx, TYPE_I8);
5538                         ++ip;
5539                         break;
5540
5541                 case CEE_CONV_OVF_I_UN:
5542                 case CEE_CONV_OVF_U_UN:
5543                         do_conversion (&ctx, TYPE_NATIVE_INT);
5544                         ++ip;
5545                         break;
5546
5547                 case CEE_BOX:
5548                         code_bounds_check (5);
5549                         do_box_value (&ctx, read32 (ip + 1));
5550                         ip += 5;
5551                         break;
5552
5553                 case CEE_NEWARR:
5554                         code_bounds_check (5);
5555                         do_newarr (&ctx, read32 (ip + 1));
5556                         ip += 5;
5557                         break;
5558
5559                 case CEE_LDLEN:
5560                         do_ldlen (&ctx);
5561                         ++ip;
5562                         break;
5563
5564                 case CEE_LDELEMA:
5565                         code_bounds_check (5);
5566                         do_ldelema (&ctx, read32 (ip + 1));
5567                         ip += 5;
5568                         break;
5569
5570                 case CEE_LDELEM_I1:
5571                 case CEE_LDELEM_U1:
5572                 case CEE_LDELEM_I2:
5573                 case CEE_LDELEM_U2:
5574                 case CEE_LDELEM_I4:
5575                 case CEE_LDELEM_U4:
5576                 case CEE_LDELEM_I8:
5577                 case CEE_LDELEM_I:
5578                 case CEE_LDELEM_R4:
5579                 case CEE_LDELEM_R8:
5580                 case CEE_LDELEM_REF:
5581                         do_ldelem (&ctx, *ip, 0);
5582                         ++ip;
5583                         break;
5584
5585                 case CEE_STELEM_I:
5586                 case CEE_STELEM_I1:
5587                 case CEE_STELEM_I2:
5588                 case CEE_STELEM_I4:
5589                 case CEE_STELEM_I8:
5590                 case CEE_STELEM_R4:
5591                 case CEE_STELEM_R8:
5592                 case CEE_STELEM_REF:
5593                         do_stelem (&ctx, *ip, 0);
5594                         ++ip;
5595                         break;
5596
5597                 case CEE_LDELEM:
5598                         code_bounds_check (5);
5599                         do_ldelem (&ctx, *ip, read32 (ip + 1));
5600                         ip += 5;
5601                         break;
5602
5603                 case CEE_STELEM:
5604                         code_bounds_check (5);
5605                         do_stelem (&ctx, *ip, read32 (ip + 1));
5606                         ip += 5;
5607                         break;
5608
5609                 case CEE_UNBOX_ANY:
5610                         code_bounds_check (5);
5611                         do_unbox_any (&ctx, read32 (ip + 1));
5612                         ip += 5;
5613                         break;
5614
5615                 case CEE_CONV_OVF_I1:
5616                 case CEE_CONV_OVF_U1:
5617                 case CEE_CONV_OVF_I2:
5618                 case CEE_CONV_OVF_U2:
5619                 case CEE_CONV_OVF_I4:
5620                 case CEE_CONV_OVF_U4:
5621                         do_conversion (&ctx, TYPE_I4);
5622                         ++ip;
5623                         break;
5624
5625                 case CEE_CONV_OVF_I8:
5626                 case CEE_CONV_OVF_U8:
5627                         do_conversion (&ctx, TYPE_I8);
5628                         ++ip;
5629                         break;
5630
5631                 case CEE_CONV_OVF_I:
5632                 case CEE_CONV_OVF_U:
5633                         do_conversion (&ctx, TYPE_NATIVE_INT);
5634                         ++ip;
5635                         break;
5636
5637                 case CEE_REFANYVAL:
5638                         code_bounds_check (5);
5639                         do_refanyval (&ctx, read32 (ip + 1));
5640                         ip += 5;
5641                         break;
5642
5643                 case CEE_CKFINITE:
5644                         do_ckfinite (&ctx);
5645                         ++ip;
5646                         break;
5647
5648                 case CEE_MKREFANY:
5649                         code_bounds_check (5);
5650                         do_mkrefany (&ctx,  read32 (ip + 1));
5651                         ip += 5;
5652                         break;
5653
5654                 case CEE_LDTOKEN:
5655                         code_bounds_check (5);
5656                         do_load_token (&ctx, read32 (ip + 1));
5657                         ip += 5;
5658                         break;
5659
5660                 case CEE_ENDFINALLY:
5661                         if (!is_correct_endfinally (ctx.header, ip_offset))
5662                                 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("endfinally must be used inside a finally/fault handler at 0x%04x", ctx.ip_offset));
5663                         ctx.eval.size = 0;
5664                         start = 1;
5665                         ++ip;
5666                         break;
5667
5668                 case CEE_LEAVE:
5669                         code_bounds_check (5);
5670                         do_leave (&ctx, read32 (ip + 1) + 5);
5671                         ip += 5;
5672                         start = 1;
5673                         break;
5674
5675                 case CEE_LEAVE_S:
5676                         code_bounds_check (2);
5677                         do_leave (&ctx, (signed char)ip [1] + 2);
5678                         ip += 2;
5679                         start = 1;
5680                         break;
5681
5682                 case CEE_PREFIX1:
5683                         code_bounds_check (2);
5684                         ++ip;
5685                         switch (*ip) {
5686                         case CEE_STLOC:
5687                                 code_bounds_check (3);
5688                                 store_local (&ctx, read16 (ip + 1));
5689                                 ip += 3;
5690                                 break;
5691
5692                         case CEE_CEQ:
5693                                 do_cmp_op (&ctx, cmp_br_eq_op, *ip);
5694                                 ++ip;
5695                                 break;
5696
5697                         case CEE_CGT:
5698                         case CEE_CGT_UN:
5699                         case CEE_CLT:
5700                         case CEE_CLT_UN:
5701                                 do_cmp_op (&ctx, cmp_br_op, *ip);
5702                                 ++ip;
5703                                 break;
5704
5705                         case CEE_STARG:
5706                                 code_bounds_check (3);
5707                                 store_arg (&ctx, read16 (ip + 1) );
5708                                 ip += 3;
5709                                 break;
5710
5711
5712                         case CEE_ARGLIST:
5713                                 check_overflow (&ctx);
5714                                 if (ctx.signature->call_convention != MONO_CALL_VARARG)
5715                                         ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Cannot use arglist on method without VARGARG calling convention at 0x%04x", ctx.ip_offset));
5716                                 set_stack_value (&ctx, stack_push (&ctx), &mono_defaults.argumenthandle_class->byval_arg, FALSE);
5717                                 ++ip;
5718                                 break;
5719
5720                         case CEE_LDFTN:
5721                                 code_bounds_check (5);
5722                                 do_load_function_ptr (&ctx, read32 (ip + 1), FALSE);
5723                                 ip += 5;
5724                                 break;
5725
5726                         case CEE_LDVIRTFTN:
5727                                 code_bounds_check (5);
5728                                 do_load_function_ptr (&ctx, read32 (ip + 1), TRUE);
5729                                 ip += 5;
5730                                 break;
5731
5732                         case CEE_UNUSED56:
5733                                 ++ip;
5734                                 break;
5735
5736                         case CEE_LDARG:
5737                         case CEE_LDARGA:
5738                                 code_bounds_check (3);
5739                                 push_arg (&ctx, read16 (ip + 1),  *ip == CEE_LDARGA);
5740                                 ip += 3;
5741                                 break;
5742
5743                         case CEE_LDLOC:
5744                         case CEE_LDLOCA:
5745                                 code_bounds_check (3);
5746                                 push_local (&ctx, read16 (ip + 1), *ip == CEE_LDLOCA);
5747                                 ip += 3;
5748                                 break;
5749
5750                         case CEE_LOCALLOC:
5751                                 do_localloc (&ctx);
5752                                 ++ip;
5753                                 break;
5754
5755                         case CEE_UNUSED57:
5756                                 ++ip;
5757                                 break;
5758                         case CEE_ENDFILTER:
5759                                 do_endfilter (&ctx);
5760                                 start = 1;
5761                                 ++ip;
5762                                 break;
5763                         case CEE_UNALIGNED_:
5764                                 code_bounds_check (2);
5765                                 prefix |= PREFIX_UNALIGNED;
5766                                 ip += 2;
5767                                 break;
5768                         case CEE_VOLATILE_:
5769                                 prefix |= PREFIX_VOLATILE;
5770                                 ++ip;
5771                                 break;
5772                         case CEE_TAIL_:
5773                                 prefix |= PREFIX_TAIL;
5774                                 ++ip;
5775                                 if (ip < end && (*ip != CEE_CALL && *ip != CEE_CALLI && *ip != CEE_CALLVIRT))
5776                                         ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("tail prefix must be used only with call opcodes at 0x%04x", ip_offset));
5777                                 break;
5778
5779                         case CEE_INITOBJ:
5780                                 code_bounds_check (5);
5781                                 do_initobj (&ctx, read32 (ip + 1));
5782                                 ip += 5;
5783                                 break;
5784
5785                         case CEE_CONSTRAINED_:
5786                                 code_bounds_check (5);
5787                                 ctx.constrained_type = get_boxable_mono_type (&ctx, read32 (ip + 1), "constrained.");
5788                                 prefix |= PREFIX_CONSTRAINED;
5789                                 ip += 5;
5790                                 break;
5791
5792                         case CEE_READONLY_:
5793                                 prefix |= PREFIX_READONLY;
5794                                 ip++;
5795                                 break;
5796
5797                         case CEE_CPBLK:
5798                                 CLEAR_PREFIX (&ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
5799                                 if (!check_underflow (&ctx, 3))
5800                                         break;
5801                                 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Instruction cpblk is not verifiable at 0x%04x", ctx.ip_offset));
5802                                 ip++;
5803                                 break;
5804
5805                         case CEE_INITBLK:
5806                                 CLEAR_PREFIX (&ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
5807                                 if (!check_underflow (&ctx, 3))
5808                                         break;
5809                                 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Instruction initblk is not verifiable at 0x%04x", ctx.ip_offset));
5810                                 ip++;
5811                                 break;
5812
5813                         case CEE_NO_:
5814                                 ip += 2;
5815                                 break;
5816                         case CEE_RETHROW:
5817                                 if (!is_correct_rethrow (ctx.header, ip_offset))
5818                                         ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("rethrow must be used inside a catch handler at 0x%04x", ctx.ip_offset));
5819                                 ctx.eval.size = 0;
5820                                 start = 1;
5821                                 ++ip;
5822                                 break;
5823                         case CEE_UNUSED:
5824                                 ++ip;
5825                                 break;
5826
5827                         case CEE_SIZEOF:
5828                                 code_bounds_check (5);
5829                                 do_sizeof (&ctx, read32 (ip + 1));
5830                                 ip += 5;
5831                                 break;
5832
5833                         case CEE_REFANYTYPE:
5834                                 do_refanytype (&ctx);
5835                                 ++ip;
5836                                 break;
5837
5838                         default:
5839                                 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction FE %x at 0x%04x", *ip, ctx.ip_offset));
5840                                 ++ip;
5841                         }
5842                         break;
5843
5844                 default:
5845                         ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction %x at 0x%04x", *ip, ctx.ip_offset));
5846                         ++ip;
5847                 }
5848
5849                 /*TODO we can fast detect a forward branch or exception block targeting code after prefix, we should fail fast*/
5850                 if (prefix) {
5851                         if (!ctx.prefix_set) //first prefix
5852                                 ctx.code [ctx.ip_offset].flags |= IL_CODE_FLAG_SEEN;
5853                         ctx.prefix_set |= prefix;
5854                         ctx.has_flags = TRUE;
5855                         prefix = 0;
5856                 } else {
5857                         if (!ctx.has_flags)
5858                                 ctx.code [ctx.ip_offset].flags |= IL_CODE_FLAG_SEEN;
5859
5860                         if (ctx.prefix_set & PREFIX_CONSTRAINED)
5861                                 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction after constrained prefix at 0x%04x", ctx.ip_offset));
5862                         if (ctx.prefix_set & PREFIX_READONLY)
5863                                 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction after readonly prefix at 0x%04x", ctx.ip_offset));
5864                         if (ctx.prefix_set & PREFIX_VOLATILE)
5865                                 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction after volatile prefix at 0x%04x", ctx.ip_offset));
5866                         if (ctx.prefix_set & PREFIX_UNALIGNED)
5867                                 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction after unaligned prefix at 0x%04x", ctx.ip_offset));
5868                         ctx.prefix_set = prefix = 0;
5869                         ctx.has_flags = FALSE;
5870                 }
5871         }
5872         /*
5873          * if ip != end we overflowed: mark as error.
5874          */
5875         if ((ip != end || !start) && ctx.verifiable && !ctx.list) {
5876                 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Run ahead of method code at 0x%04x", ip_offset));
5877         }
5878
5879         /*We should guard against the last decoded opcode, otherwise we might add errors that doesn't make sense.*/
5880         for (i = 0; i < ctx.code_size && i < ip_offset; ++i) {
5881                 if (ctx.code [i].flags & IL_CODE_FLAG_WAS_TARGET) {
5882                         if (!(ctx.code [i].flags & IL_CODE_FLAG_SEEN))
5883                                 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Branch or exception block target middle of intruction at 0x%04x", i));
5884
5885                         if (ctx.code [i].flags & IL_CODE_DELEGATE_SEQUENCE)
5886                                 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Branch to delegate code sequence at 0x%04x", i));
5887                 }
5888                 if ((ctx.code [i].flags & IL_CODE_LDFTN_DELEGATE_NONFINAL_VIRTUAL) && ctx.has_this_store)
5889                         CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Invalid ldftn with virtual function in method with stdarg 0 at  0x%04x", i));
5890
5891                 if ((ctx.code [i].flags & IL_CODE_CALL_NONFINAL_VIRTUAL) && ctx.has_this_store)
5892                         CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Invalid call to a non-final virtual function in method with stdarg.0 or ldarga.0 at  0x%04x", i));
5893         }
5894
5895         if (mono_method_is_constructor (ctx.method) && !ctx.super_ctor_called && !ctx.method->klass->valuetype && ctx.method->klass != mono_defaults.object_class) {
5896                 char *method_name = mono_method_full_name (ctx.method, TRUE);
5897                 char *type = mono_type_get_full_name (ctx.method->klass);
5898                 if (ctx.method->klass->parent && ctx.method->klass->parent->exception_type != MONO_EXCEPTION_NONE)
5899                         CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Constructor %s for type %s not calling base type ctor due to a TypeLoadException on base type.", method_name, type));
5900                 else
5901                         CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Constructor %s for type %s not calling base type ctor.", method_name, type));
5902                 g_free (method_name);
5903                 g_free (type);
5904         }
5905
5906 cleanup:
5907         if (ctx.code) {
5908                 for (i = 0; i < ctx.header->code_size; ++i) {
5909                         if (ctx.code [i].stack)
5910                                 g_free (ctx.code [i].stack);
5911                 }
5912         }
5913
5914         for (tmp = ctx.funptrs; tmp; tmp = tmp->next)
5915                 g_free (tmp->data);
5916         g_slist_free (ctx.funptrs);
5917
5918         for (tmp = ctx.exception_types; tmp; tmp = tmp->next)
5919                 mono_metadata_free_type (tmp->data);
5920         g_slist_free (ctx.exception_types);
5921
5922         for (i = 0; i < ctx.num_locals; ++i)
5923                 mono_metadata_free_type (ctx.locals [i]);
5924         for (i = 0; i < ctx.max_args; ++i)
5925                 mono_metadata_free_type (ctx.params [i]);
5926
5927         if (ctx.eval.stack)
5928                 g_free (ctx.eval.stack);
5929         if (ctx.code)
5930                 g_free (ctx.code);
5931         g_free (ctx.locals);
5932         g_free (ctx.params);
5933
5934         return ctx.list;
5935 }
5936
5937 char*
5938 mono_verify_corlib ()
5939 {
5940         /* This is a public API function so cannot be removed */
5941         return NULL;
5942 }
5943
5944 /*
5945  * Returns true if @method needs to be verified.
5946  *
5947  */
5948 gboolean
5949 mono_verifier_is_enabled_for_method (MonoMethod *method)
5950 {
5951         return mono_verifier_is_enabled_for_class (method->klass) && method->wrapper_type == MONO_WRAPPER_NONE;
5952 }
5953
5954 /*
5955  * Returns true if @klass need to be verified.
5956  *
5957  */
5958 gboolean
5959 mono_verifier_is_enabled_for_class (MonoClass *klass)
5960 {
5961         return verify_all || (verifier_mode > MONO_VERIFIER_MODE_OFF && !klass->image->assembly->in_gac && klass->image != mono_defaults.corlib);
5962 }
5963
5964 gboolean
5965 mono_verifier_is_enabled_for_image (MonoImage *image)
5966 {
5967         return verify_all || verifier_mode > MONO_VERIFIER_MODE_OFF;
5968 }
5969
5970 gboolean
5971 mono_verifier_is_method_full_trust (MonoMethod *method)
5972 {
5973         return mono_verifier_is_class_full_trust (method->klass);
5974 }
5975
5976 /*
5977  * Returns if @klass is under full trust or not.
5978  *
5979  * TODO This code doesn't take CAS into account.
5980  *
5981  * Under verify_all all user code must be verifiable if no security option was set
5982  *
5983  */
5984 gboolean
5985 mono_verifier_is_class_full_trust (MonoClass *klass)
5986 {
5987         /* under CoreCLR code is trusted if it is part of the "platform" otherwise all code inside the GAC is trusted */
5988         gboolean trusted_location = (mono_security_get_mode () != MONO_SECURITY_MODE_CORE_CLR) ?
5989                 klass->image->assembly->in_gac : mono_security_core_clr_is_platform_image (klass->image);
5990
5991         if (verify_all && verifier_mode == MONO_VERIFIER_MODE_OFF)
5992                 return trusted_location || klass->image == mono_defaults.corlib;
5993         return verifier_mode < MONO_VERIFIER_MODE_VERIFIABLE || trusted_location || klass->image == mono_defaults.corlib;
5994 }
5995
5996 GSList*
5997 mono_method_verify_with_current_settings (MonoMethod *method, gboolean skip_visibility)
5998 {
5999         return mono_method_verify (method,
6000                         (verifier_mode != MONO_VERIFIER_MODE_STRICT ? MONO_VERIFY_NON_STRICT: 0)
6001                         | (!mono_verifier_is_method_full_trust (method) ? MONO_VERIFY_FAIL_FAST : 0)
6002                         | (skip_visibility ? MONO_VERIFY_SKIP_VISIBILITY : 0));
6003 }
6004
6005 static int
6006 get_field_end (MonoClassField *field)
6007 {
6008         int align;
6009         int size = mono_type_size (field->type, &align);
6010         if (size == 0)
6011                 size = 4; /*FIXME Is this a safe bet?*/
6012         return size + field->offset;
6013 }
6014
6015 static gboolean
6016 verify_class_for_overlapping_reference_fields (MonoClass *class)
6017 {
6018         int i, j;
6019         gboolean is_fulltrust = mono_verifier_is_class_full_trust (class);
6020         if (!((class->flags & TYPE_ATTRIBUTE_LAYOUT_MASK) == TYPE_ATTRIBUTE_EXPLICIT_LAYOUT) || !class->has_references)
6021                 return TRUE;
6022
6023                 //we must check for stuff overlapping reference fields
6024         for (i = 0; i < class->field.count; ++i) {
6025                 MonoClassField *field = &class->fields [i];
6026                 int fieldEnd = get_field_end (field);
6027                 gboolean is_valuetype = !MONO_TYPE_IS_REFERENCE (field->type);
6028                 if (mono_field_is_deleted (field) || (field->type->attrs & FIELD_ATTRIBUTE_STATIC))
6029                         continue;
6030
6031                 for (j = i + 1; j < class->field.count; ++j) {
6032                         MonoClassField *other = &class->fields [j];
6033                         int otherEnd = get_field_end (other);
6034                         if (mono_field_is_deleted (other) || (is_valuetype && !MONO_TYPE_IS_REFERENCE (other->type)) || (other->type->attrs & FIELD_ATTRIBUTE_STATIC))
6035                                 continue;
6036
6037                         if (!is_valuetype && MONO_TYPE_IS_REFERENCE (other->type) && field->offset == other->offset && is_fulltrust)
6038                                 continue;
6039
6040                         if ((otherEnd > field->offset && otherEnd <= fieldEnd) || (other->offset >= field->offset && other->offset < fieldEnd))
6041                                 return FALSE;
6042                 }
6043         }
6044         return TRUE;
6045 }
6046
6047 static guint
6048 field_hash (gconstpointer key)
6049 {
6050         const MonoClassField *field = key;
6051         return g_str_hash (field->name) ^ mono_metadata_type_hash (field->type); /**/
6052 }
6053
6054 static gboolean
6055 field_equals (gconstpointer _a, gconstpointer _b)
6056 {
6057         const MonoClassField *a = _a;
6058         const MonoClassField *b = _b;
6059         return !strcmp (a->name, b->name) && mono_metadata_type_equal (a->type, b->type);
6060 }
6061
6062
6063 static gboolean
6064 verify_class_fields (MonoClass *class)
6065 {
6066         gpointer iter = NULL;
6067         MonoClassField *field;
6068         MonoGenericContext *context = mono_class_get_context (class);
6069         GHashTable *unique_fields = g_hash_table_new_full (&field_hash, &field_equals, NULL, NULL);
6070         if (class->generic_container)
6071                 context = &class->generic_container->context;
6072
6073         while ((field = mono_class_get_fields (class, &iter)) != NULL) {
6074                 if (!mono_type_is_valid_type_in_context (field->type, context)) {
6075                         g_hash_table_destroy (unique_fields);
6076                         return FALSE;
6077                 }
6078                 if (g_hash_table_lookup (unique_fields, field)) {
6079                         g_hash_table_destroy (unique_fields);
6080                         return FALSE;
6081                 }
6082                 g_hash_table_insert (unique_fields, field, field);
6083         }
6084         g_hash_table_destroy (unique_fields);
6085         return TRUE;
6086 }
6087
6088 static gboolean
6089 verify_interfaces (MonoClass *class)
6090 {
6091         int i;
6092         for (i = 0; i < class->interface_count; ++i) {
6093                 MonoClass *iface = class->interfaces [i];
6094                 if (!(iface->flags & TYPE_ATTRIBUTE_INTERFACE))
6095                         return FALSE;
6096         }
6097         return TRUE;
6098 }
6099
6100 static gboolean
6101 verify_valuetype_layout_with_target (MonoClass *class, MonoClass *target_class)
6102 {
6103         int type;
6104         gpointer iter = NULL;
6105         MonoClassField *field;
6106         MonoClass *field_class;
6107
6108         if (!class->valuetype)
6109                 return TRUE;
6110
6111         type = class->byval_arg.type;
6112         /*primitive type fields are not properly decoded*/
6113         if ((type >= MONO_TYPE_BOOLEAN && type <= MONO_TYPE_R8) || (type >= MONO_TYPE_I && type <= MONO_TYPE_U))
6114                 return TRUE;
6115
6116         while ((field = mono_class_get_fields (class, &iter)) != NULL) {
6117                 if (!field->type)
6118                         return FALSE;
6119
6120                 if (field->type->attrs & (FIELD_ATTRIBUTE_STATIC | FIELD_ATTRIBUTE_HAS_FIELD_RVA))
6121                         continue;
6122
6123                 field_class = mono_class_get_generic_type_definition (mono_class_from_mono_type (field->type));
6124
6125                 if (field_class == target_class || !verify_valuetype_layout_with_target (field_class, target_class))
6126                         return FALSE;
6127         }
6128
6129         return TRUE;
6130 }
6131
6132 static gboolean
6133 verify_valuetype_layout (MonoClass *class)
6134 {
6135         gboolean res;
6136         res = verify_valuetype_layout_with_target (class, class);
6137         return res;
6138 }
6139
6140 /*
6141  * Check if the class is verifiable.
6142  *
6143  * Right now there are no conditions that make a class a valid but not verifiable. Both overlapping reference
6144  * field and invalid generic instantiation are fatal errors.
6145  *
6146  * This method must be safe to be called from mono_class_init and all code must be carefull about that.
6147  *
6148  */
6149 gboolean
6150 mono_verifier_verify_class (MonoClass *class)
6151 {
6152         if (class->generic_container && (class->flags & TYPE_ATTRIBUTE_LAYOUT_MASK) == TYPE_ATTRIBUTE_EXPLICIT_LAYOUT)
6153                 return FALSE;
6154         if (!verify_class_for_overlapping_reference_fields (class))
6155                 return FALSE;
6156         if (class->generic_class && !mono_class_is_valid_generic_instantiation (NULL, class))
6157                 return FALSE;
6158         if (class->generic_class == NULL && !verify_class_fields (class))
6159                 return FALSE;
6160         if (class->valuetype && !verify_valuetype_layout (class))
6161                 return FALSE;
6162         if (!verify_interfaces (class))
6163                 return FALSE;
6164         return TRUE;
6165 }
6166 #else
6167
6168 gboolean
6169 mono_verifier_verify_class (MonoClass *class)
6170 {
6171         /* The verifier was disabled at compile time */
6172         return TRUE;
6173 }
6174
6175 GSList*
6176 mono_method_verify_with_current_settings (MonoMethod *method, gboolean skip_visibility)
6177 {
6178         /* The verifier was disabled at compile time */
6179         return NULL;
6180 }
6181
6182 gboolean
6183 mono_verifier_is_class_full_trust (MonoClass *klass)
6184 {
6185         /* The verifier was disabled at compile time */
6186         return TRUE;
6187 }
6188
6189 gboolean
6190 mono_verifier_is_method_full_trust (MonoMethod *method)
6191 {
6192         /* The verifier was disabled at compile time */
6193         return TRUE;
6194 }
6195
6196 gboolean
6197 mono_verifier_is_enabled_for_image (MonoImage *image)
6198 {
6199         /* The verifier was disabled at compile time */
6200         return FALSE;
6201 }
6202
6203 gboolean
6204 mono_verifier_is_enabled_for_class (MonoClass *klass)
6205 {
6206         /* The verifier was disabled at compile time */
6207         return FALSE;
6208 }
6209
6210 gboolean
6211 mono_verifier_is_enabled_for_method (MonoMethod *method)
6212 {
6213         /* The verifier was disabled at compile time */
6214         return FALSE;
6215 }
6216
6217 GSList*
6218 mono_method_verify (MonoMethod *method, int level)
6219 {
6220         /* The verifier was disabled at compile time */
6221         return NULL;
6222 }
6223
6224 void
6225 mono_free_verify_list (GSList *list)
6226 {
6227         /* The verifier was disabled at compile time */
6228         /* will always be null if verifier is disabled */
6229 }
6230
6231 GSList*
6232 mono_image_verify_tables (MonoImage *image, int level)
6233 {
6234         /* The verifier was disabled at compile time */
6235         return NULL;
6236 }
6237 #endif