2005-03-28 Zoltan Varga <vargaz@freemail.hu>
[mono.git] / mono / metadata / verify.c
index dfcfc5fc559550d537297e398b2ace37d037aa25..c60d39e5310eb5b660541438f419dd99046d4db5 100644 (file)
@@ -1,11 +1,15 @@
 
-#include <mono/metadata/object.h>
+#include <mono/metadata/object-internals.h>
 #include <mono/metadata/verify.h>
 #include <mono/metadata/opcodes.h>
 #include <mono/metadata/tabledefs.h>
 #include <mono/metadata/reflection.h>
 #include <mono/metadata/debug-helpers.h>
 #include <mono/metadata/mono-endian.h>
+#include <mono/metadata/metadata.h>
+#include <mono/metadata/metadata-internals.h>
+#include <mono/metadata/class-internals.h>
+#include <mono/metadata/tokentype.h>
 #include <string.h>
 #include <signal.h>
 #include <ctype.h>
@@ -318,7 +322,7 @@ verify_constant_table (MonoImage *image, GSList *list, int level)
        MonoTableInfo *t = &image->tables [MONO_TABLE_CONSTANT];
        guint32 cols [MONO_CONSTANT_SIZE];
        guint32 value, i;
-       GHashTable *dups = g_hash_table_new (g_direct_hash, g_direct_equal);
+       GHashTable *dups = g_hash_table_new (NULL, NULL);
        
        for (i = 0; i < t->rows; ++i) {
                mono_metadata_decode_row (t, i, cols, MONO_CONSTANT_SIZE);
@@ -352,17 +356,17 @@ verify_constant_table (MonoImage *image, GSList *list, int level)
                                ADD_ERROR (list, g_strdup_printf ("Type 0x%x is invalid in Constant row %d", cols [MONO_CONSTANT_TYPE], i + 1));
                }
                if (level & MONO_VERIFY_ERROR) {
-                       value = cols [MONO_CONSTANT_PARENT] >> HASCONSTANT_BITS;
-                       switch (cols [MONO_CONSTANT_PARENT] & HASCONSTANT_MASK) {
-                       case HASCONSTANT_FIEDDEF:
+                       value = cols [MONO_CONSTANT_PARENT] >> MONO_HASCONSTANT_BITS;
+                       switch (cols [MONO_CONSTANT_PARENT] & MONO_HASCONSTANT_MASK) {
+                       case MONO_HASCONSTANT_FIEDDEF:
                                if (value > image->tables [MONO_TABLE_FIELD].rows)
                                        ADD_ERROR (list, g_strdup_printf ("Parent (field) is invalid in Constant row %d", i + 1));
                                break;
-                       case HASCONSTANT_PARAM:
+                       case MONO_HASCONSTANT_PARAM:
                                if (value > image->tables [MONO_TABLE_PARAM].rows)
                                        ADD_ERROR (list, g_strdup_printf ("Parent (param) is invalid in Constant row %d", i + 1));
                                break;
-                       case HASCONSTANT_PROPERTY:
+                       case MONO_HASCONSTANT_PROPERTY:
                                if (value > image->tables [MONO_TABLE_PROPERTY].rows)
                                        ADD_ERROR (list, g_strdup_printf ("Parent (property) is invalid in Constant row %d", i + 1));
                                break;
@@ -388,7 +392,7 @@ verify_event_map_table (MonoImage *image, GSList *list, int level)
        MonoTableInfo *t = &image->tables [MONO_TABLE_EVENTMAP];
        guint32 cols [MONO_EVENT_MAP_SIZE];
        guint32 i, last_event;
-       GHashTable *dups = g_hash_table_new (g_direct_hash, g_direct_equal);
+       GHashTable *dups = g_hash_table_new (NULL, NULL);
 
        last_event = 0;
 
@@ -441,17 +445,17 @@ verify_event_table (MonoImage *image, GSList *list, int level)
                }
                
                if (level & MONO_VERIFY_ERROR && cols [MONO_EVENT_TYPE]) {
-                       value = cols [MONO_EVENT_TYPE] >> TYPEDEFORREF_BITS;
-                       switch (cols [MONO_EVENT_TYPE] & TYPEDEFORREF_MASK) {
-                       case TYPEDEFORREF_TYPEDEF:
+                       value = cols [MONO_EVENT_TYPE] >> MONO_TYPEDEFORREF_BITS;
+                       switch (cols [MONO_EVENT_TYPE] & MONO_TYPEDEFORREF_MASK) {
+                       case MONO_TYPEDEFORREF_TYPEDEF:
                                if (!value || value > image->tables [MONO_TABLE_TYPEDEF].rows)
                                        ADD_ERROR (list, g_strdup_printf ("Type invalid in Event row %d", i + 1));
                                break;
-                       case TYPEDEFORREF_TYPEREF:
+                       case MONO_TYPEDEFORREF_TYPEREF:
                                if (!value || value > image->tables [MONO_TABLE_TYPEREF].rows)
                                        ADD_ERROR (list, g_strdup_printf ("Type invalid in Event row %d", i + 1));
                                break;
-                       case TYPEDEFORREF_TYPESPEC:
+                       case MONO_TYPEDEFORREF_TYPESPEC:
                                if (!value || value > image->tables [MONO_TABLE_TYPESPEC].rows)
                                        ADD_ERROR (list, g_strdup_printf ("Type invalid in Event row %d", i + 1));
                                break;
@@ -682,7 +686,7 @@ enum {
        TYPE_MAX = 8
 };
 
-static const char* 
+static const char*  const
 arg_name [TYPE_MAX] = {
        "Invalid",
        "Int32",
@@ -1132,6 +1136,7 @@ mono_method_verify (MonoMethod *method, int level)
 {
        MonoMethodHeader *header;
        MonoMethodSignature *signature, *csig;
+       MonoGenericContext *generic_context = NULL;
        MonoMethod *cmethod;
        MonoClassField *field;
        MonoClass *klass;
@@ -1140,9 +1145,9 @@ mono_method_verify (MonoMethod *method, int level)
        ILStackDesc *stack;
        register const unsigned char *ip;
        register const unsigned char *end;
-       const unsigned char *target; /* branch target */
+       const unsigned char *target = NULL; /* branch target */
        int max_args, max_stack, cur_stack, i, n, need_merge, start;
-       guint32 token, ip_offset;
+       guint32 token, ip_offset = 0;
        char *local_state = NULL;
        GSList *list = NULL;
        guint prefix = 0;
@@ -1152,8 +1157,8 @@ mono_method_verify (MonoMethod *method, int level)
                        (method->flags & (METHOD_ATTRIBUTE_PINVOKE_IMPL | METHOD_ATTRIBUTE_ABSTRACT))) {
                return NULL;
        }
-       signature = method->signature;
-       header = ((MonoMethodNormal *)method)->header;
+       signature = mono_method_signature (method);
+       header = mono_method_get_header (method);
        ip = header->code;
        end = ip + header->code_size;
        max_args = signature->param_count + signature->hasthis;
@@ -1171,6 +1176,9 @@ mono_method_verify (MonoMethod *method, int level)
                params = signature->params;
        }
 
+       if (signature->is_inflated)
+               generic_context = ((MonoMethodInflated *) method)->context;
+
        if (header->num_locals) {
                local_state = g_new (char, header->num_locals);
                memset (local_state, header->init_locals, header->num_locals);
@@ -1210,7 +1218,7 @@ mono_method_verify (MonoMethod *method, int level)
 #if 0
                {
                        char *discode;
-                       discode = mono_disasm_code_one (NULL, method, ip);
+                       discode = mono_disasm_code_one (NULL, method, ip, NULL);
                        discode [strlen (discode) - 1] = 0; /* no \n */
                        g_print ("%-29s (%d)\n", discode, cur_stack);
                        g_free (discode);
@@ -1385,10 +1393,15 @@ mono_method_verify (MonoMethod *method, int level)
                        /*
                         * FIXME: we could just load the signature ...
                         */
-                       cmethod = mono_get_method (image, token, NULL);
+                       cmethod = mono_get_method_full (image, token, NULL, generic_context);
                        if (!cmethod)
                                ADD_INVALID (list, g_strdup_printf ("Method 0x%08x not found at 0x%04x", token, ip_offset));
-                       csig = cmethod->signature;
+                       if (mono_method_signature (cmethod)) {
+                               csig = mono_method_signature (cmethod);
+                       } else {
+                               csig = mono_method_get_signature (cmethod, image, token);
+                       }
+
                        CHECK_STACK_UNDERFLOW (csig->param_count + csig->hasthis);
                        cur_stack -= csig->param_count + csig->hasthis;
                        if (csig->ret->type != MONO_TYPE_VOID) {
@@ -1418,6 +1431,7 @@ mono_method_verify (MonoMethod *method, int level)
                        if (in_any_block (header, ip_offset))
                                ADD_INVALID (list, g_strdup_printf ("ret cannot escape exception blocks at 0x%04x", ip_offset));
                        ++ip;
+                       start = 1;
                        break;
                case CEE_BR_S:
                        target = ip + (signed char)ip [1] + 2;
@@ -1599,7 +1613,7 @@ mono_method_verify (MonoMethod *method, int level)
                        CHECK_STACK_UNDERFLOW (1);
                        if (stack [cur_stack - 1].stype != TYPE_MP)
                                ADD_INVALID (list, g_strdup_printf ("Invalid argument to ldobj at 0x%04x", ip_offset));
-                       klass = mono_class_get (image, token);
+                       klass = mono_class_get_full (image, token, generic_context);
                        if (!klass)
                                ADD_INVALID (list, g_strdup_printf ("Cannot load class from token 0x%08x at 0x%04x", token, ip_offset));
                        if (!klass->valuetype)
@@ -1621,10 +1635,10 @@ mono_method_verify (MonoMethod *method, int level)
                        /*
                         * FIXME: we could just load the signature ...
                         */
-                       cmethod = mono_get_method (image, token, NULL);
+                       cmethod = mono_get_method_full (image, token, NULL, generic_context);
                        if (!cmethod)
                                ADD_INVALID (list, g_strdup_printf ("Constructor 0x%08x not found at 0x%04x", token, ip_offset));
-                       csig = cmethod->signature;
+                       csig = mono_method_signature (cmethod);
                        CHECK_STACK_UNDERFLOW (csig->param_count);
                        cur_stack -= csig->param_count;
                        CHECK_STACK_OVERFLOW ();
@@ -1667,7 +1681,7 @@ mono_method_verify (MonoMethod *method, int level)
                        if (stack [cur_stack - 1].stype != TYPE_OBJ && stack [cur_stack - 1].stype != TYPE_MP)
                                ADD_INVALID (list, g_strdup_printf ("Invalid argument %s to ldfld at 0x%04x", arg_name [stack [cur_stack].stype], ip_offset));
                        token = read32 (ip + 1);
-                       field = mono_field_from_token (image, token, &klass);
+                       field = mono_field_from_token (image, token, &klass, generic_context);
                        if (!field)
                                ADD_INVALID (list, g_strdup_printf ("Cannot load field from token 0x%08x at 0x%04x", token, ip_offset));
                        type_to_eval_stack_type (field->type, stack + cur_stack - 1, FALSE);
@@ -1678,7 +1692,7 @@ mono_method_verify (MonoMethod *method, int level)
                        if (stack [cur_stack - 1].stype != TYPE_OBJ && stack [cur_stack - 1].stype != TYPE_MP)
                                ADD_INVALID (list, g_strdup_printf ("Invalid argument to ldflda at 0x%04x", ip_offset));
                        token = read32 (ip + 1);
-                       field = mono_field_from_token (image, token, &klass);
+                       field = mono_field_from_token (image, token, &klass, generic_context);
                        if (!field)
                                ADD_INVALID (list, g_strdup_printf ("Cannot load field from token 0x%08x at 0x%04x", token, ip_offset));
                        type_to_eval_stack_type (field->type, stack + cur_stack - 1, TRUE);
@@ -1690,7 +1704,7 @@ mono_method_verify (MonoMethod *method, int level)
                        if (stack [cur_stack].stype != TYPE_OBJ && stack [cur_stack].stype != TYPE_MP)
                                ADD_INVALID (list, g_strdup_printf ("Invalid argument to stfld at 0x%04x", ip_offset));
                        token = read32 (ip + 1);
-                       field = mono_field_from_token (image, token, &klass);
+                       field = mono_field_from_token (image, token, &klass, generic_context);
                        if (!field)
                                ADD_INVALID (list, g_strdup_printf ("Cannot load field from token 0x%08x at 0x%04x", token, ip_offset));
                        /* can_store */
@@ -1699,7 +1713,7 @@ mono_method_verify (MonoMethod *method, int level)
                case CEE_LDSFLD:
                        CHECK_STACK_OVERFLOW ();
                        token = read32 (ip + 1);
-                       field = mono_field_from_token (image, token, &klass);
+                       field = mono_field_from_token (image, token, &klass, generic_context);
                        if (!field)
                                ADD_INVALID (list, g_strdup_printf ("Cannot load field from token 0x%08x at 0x%04x", token, ip_offset));
                        type_to_eval_stack_type (field->type, stack + cur_stack, FALSE);
@@ -1709,7 +1723,7 @@ mono_method_verify (MonoMethod *method, int level)
                case CEE_LDSFLDA:
                        CHECK_STACK_OVERFLOW ();
                        token = read32 (ip + 1);
-                       field = mono_field_from_token (image, token, &klass);
+                       field = mono_field_from_token (image, token, &klass, generic_context);
                        if (!field)
                                ADD_INVALID (list, g_strdup_printf ("Cannot load field from token 0x%08x at 0x%04x", token, ip_offset));
                        type_to_eval_stack_type (field->type, stack + cur_stack, TRUE);
@@ -1720,7 +1734,7 @@ mono_method_verify (MonoMethod *method, int level)
                        CHECK_STACK_UNDERFLOW (1);
                        --cur_stack;
                        token = read32 (ip + 1);
-                       field = mono_field_from_token (image, token, &klass);
+                       field = mono_field_from_token (image, token, &klass, generic_context);
                        if (!field)
                                ADD_INVALID (list, g_strdup_printf ("Cannot load field from token 0x%08x at 0x%04x", token, ip_offset));
                        /* can store */
@@ -1812,9 +1826,9 @@ mono_method_verify (MonoMethod *method, int level)
                        cur_stack -= 3;
                        ++ip;
                        break;
-               case CEE_UNUSED2:
-               case CEE_UNUSED3:
-               case CEE_UNUSED4:
+               case CEE_LDELEM_ANY:
+               case CEE_STELEM_ANY:
+               case CEE_UNBOX_ANY:
                case CEE_UNUSED5:
                case CEE_UNUSED6:
                case CEE_UNUSED7:
@@ -2082,8 +2096,9 @@ mono_method_verify (MonoMethod *method, int level)
                                ip += 5;
                                --cur_stack;
                                break;
-                       case CEE_UNUSED68:
-                               ++ip;
+                       case CEE_CONSTRAINED_:
+                               token = read32 (ip + 1);
+                               ip += 5;
                                break;
                        case CEE_CPBLK:
                                CHECK_STACK_UNDERFLOW (3);
@@ -2093,8 +2108,8 @@ mono_method_verify (MonoMethod *method, int level)
                                CHECK_STACK_UNDERFLOW (3);
                                ip++;
                                break;
-                       case CEE_UNUSED69:
-                               ++ip;
+                       case CEE_NO_:
+                               ip += 2;
                                break;
                        case CEE_RETHROW:
                                ++ip;
@@ -2114,7 +2129,6 @@ mono_method_verify (MonoMethod *method, int level)
                                CHECK_STACK_UNDERFLOW (1);
                                ++ip;
                                break;
-                       case CEE_UNUSED52:
                        case CEE_UNUSED53:
                        case CEE_UNUSED54:
                        case CEE_UNUSED55:
@@ -2125,8 +2139,11 @@ mono_method_verify (MonoMethod *method, int level)
                }
        }
        /*
-        * FIXME: if ip != end we overflowed: mark as error.
+        * if ip != end we overflowed: mark as error.
         */
+       if (ip != end || !start) {
+               ADD_INVALID (list, g_strdup_printf ("Run ahead of method code at 0x%04x", ip_offset));
+       }
 invalid_cil:
 
        g_free (local_state);
@@ -2176,6 +2193,8 @@ assemblybuilder_fields[] = {
        {"modules", G_STRUCT_OFFSET (MonoReflectionAssemblyBuilder, modules)},
        {"name", G_STRUCT_OFFSET (MonoReflectionAssemblyBuilder, name)},
        {"resources", G_STRUCT_OFFSET (MonoReflectionAssemblyBuilder, resources)},
+       {"version", G_STRUCT_OFFSET (MonoReflectionAssemblyBuilder, version)},
+       {"culture", G_STRUCT_OFFSET (MonoReflectionAssemblyBuilder, culture)},
        {NULL, 0}
 };
 
@@ -2239,7 +2258,6 @@ propertybuilder_fields[] = {
 static const FieldDesc 
 ilgenerator_fields[] = {
        {"code", G_STRUCT_OFFSET (MonoReflectionILGen, code)},
-       {"mbuilder", G_STRUCT_OFFSET (MonoReflectionILGen, mbuilder)},
        {"code_len", G_STRUCT_OFFSET (MonoReflectionILGen, code_len)},
        {"max_stack", G_STRUCT_OFFSET (MonoReflectionILGen, max_stack)},
        {"cur_stack", G_STRUCT_OFFSET (MonoReflectionILGen, cur_stack)},
@@ -2322,15 +2340,6 @@ monopropertyinfo_fields[] = {
        {NULL, 0}
 };
 
-static const FieldDesc 
-monofieldinfo_fields[] = {
-       {"parent", G_STRUCT_OFFSET (MonoFieldInfo, parent)},
-       {"type", G_STRUCT_OFFSET (MonoFieldInfo, type)},
-       {"name", G_STRUCT_OFFSET (MonoFieldInfo, name)},
-       {"attrs", G_STRUCT_OFFSET (MonoFieldInfo, attrs)},
-       {NULL, 0}
-};
-
 static const FieldDesc 
 monomethod_fields[] = {
        {"mhandle", G_STRUCT_OFFSET (MonoReflectionMethod, method)},
@@ -2361,7 +2370,6 @@ reflection_classes_to_check [] = {
        {"MonoField", monofield_fields},
        {"MonoMethodInfo", monomethodinfo_fields},
        {"MonoPropertyInfo", monopropertyinfo_fields},
-       {"MonoFieldInfo", monofieldinfo_fields},
        {"MonoMethod", monomethod_fields},
        {"MonoCMethod", monocmethod_fields},
        {"ParameterInfo", pinfo_fields},
@@ -2402,6 +2410,7 @@ async_result_fields[] = {
        {"sync_completed", G_STRUCT_OFFSET (MonoAsyncResult, sync_completed)},
        {"completed", G_STRUCT_OFFSET (MonoAsyncResult, completed)},
        {"endinvoke_called", G_STRUCT_OFFSET (MonoAsyncResult, endinvoke_called)},
+       {"async_callback", G_STRUCT_OFFSET (MonoAsyncResult, async_callback)},
        {NULL, 0}
 };
 
@@ -2468,7 +2477,7 @@ messaging_classes_to_check [] = {
 static FieldDesc 
 transparent_proxy_fields[] = {
        {"_rp", G_STRUCT_OFFSET (MonoTransparentProxy, rp)},
-       {"_class", G_STRUCT_OFFSET (MonoTransparentProxy, klass)},
+       {"_class", G_STRUCT_OFFSET (MonoTransparentProxy, remote_class)},
        {NULL, 0}
 };
 
@@ -2500,6 +2509,7 @@ thread_fields[] = {
        {"state", G_STRUCT_OFFSET (MonoThread, state)},
        {"abort_exc", G_STRUCT_OFFSET (MonoThread, abort_exc)},
        {"abort_state", G_STRUCT_OFFSET (MonoThread, abort_state)},
+       {"thread_id", G_STRUCT_OFFSET (MonoThread, tid)},
        {NULL, 0}
 };
 
@@ -2510,6 +2520,67 @@ threading_classes_to_check [] = {
        {NULL, NULL}
 };
 
+static const FieldDesc
+cinfo_fields[] = {
+       {"datetime_format", G_STRUCT_OFFSET (MonoCultureInfo, datetime_format)},
+       {"number_format", G_STRUCT_OFFSET (MonoCultureInfo, number_format)},
+       {"textinfo", G_STRUCT_OFFSET (MonoCultureInfo, textinfo)},
+       {"name", G_STRUCT_OFFSET (MonoCultureInfo, name)},
+       {"displayname", G_STRUCT_OFFSET (MonoCultureInfo, displayname)},
+       {"englishname", G_STRUCT_OFFSET (MonoCultureInfo, englishname)},
+       {"nativename", G_STRUCT_OFFSET (MonoCultureInfo, nativename)},
+       {"iso3lang", G_STRUCT_OFFSET (MonoCultureInfo, iso3lang)},
+       {"iso2lang", G_STRUCT_OFFSET (MonoCultureInfo, iso2lang)},
+       {"icu_name", G_STRUCT_OFFSET (MonoCultureInfo, icu_name)},
+       {"win3lang", G_STRUCT_OFFSET (MonoCultureInfo, win3lang)},
+       {"compareinfo", G_STRUCT_OFFSET (MonoCultureInfo, compareinfo)},
+       {NULL, 0}
+};
+
+static const FieldDesc
+dtfinfo_fields[] = {
+       {"_AMDesignator", G_STRUCT_OFFSET (MonoDateTimeFormatInfo, AMDesignator)},
+       {"_PMDesignator", G_STRUCT_OFFSET (MonoDateTimeFormatInfo, PMDesignator)},
+       {"_DayNames", G_STRUCT_OFFSET (MonoDateTimeFormatInfo, DayNames)},
+       {"_MonthNames", G_STRUCT_OFFSET (MonoDateTimeFormatInfo, MonthNames)},
+       {NULL, 0}
+};
+
+static const FieldDesc
+nfinfo_fields[] = {
+       {"decimalFormats", G_STRUCT_OFFSET (MonoNumberFormatInfo, decimalFormats)},
+       {"currencySymbol", G_STRUCT_OFFSET (MonoNumberFormatInfo, currencySymbol)},
+       {"percentSymbol", G_STRUCT_OFFSET (MonoNumberFormatInfo, percentSymbol)},
+       {"positiveSign", G_STRUCT_OFFSET (MonoNumberFormatInfo, positiveSign)},
+       {NULL, 0}
+};
+
+static const FieldDesc
+compinfo_fields[] = {
+       {"lcid", G_STRUCT_OFFSET (MonoCompareInfo, lcid)},
+       {"ICU_collator", G_STRUCT_OFFSET (MonoCompareInfo, ICU_collator)},
+       {NULL, 0}
+};
+
+static const FieldDesc
+sortkey_fields[] = {
+       {"str", G_STRUCT_OFFSET (MonoSortKey, str)},
+       {"options", G_STRUCT_OFFSET (MonoSortKey, options)},
+       {"key", G_STRUCT_OFFSET (MonoSortKey, key)},
+       {"lcid", G_STRUCT_OFFSET (MonoSortKey, lcid)},
+       {NULL, 0}
+};
+
+static const ClassDesc
+globalization_classes_to_check [] = {
+       {"CultureInfo", cinfo_fields},
+       {"DateTimeFormatInfo", dtfinfo_fields},
+       {"NumberFormatInfo", nfinfo_fields},
+       {"CompareInfo", compinfo_fields},
+       {"SortKey", sortkey_fields},
+       {NULL, NULL}
+};
+
 typedef struct {
        const char *name;
        const ClassDesc *types;
@@ -2524,6 +2595,7 @@ namespaces_to_check[] = {
        {"System.Threading", threading_classes_to_check},
        {"System.Diagnostics", system_diagnostics_classes_to_check},
        {"System", system_classes_to_check},
+       {"System.Globalization", globalization_classes_to_check},
        {NULL, NULL}
 };
 
@@ -2536,28 +2608,38 @@ check_corlib (MonoImage *corlib)
        const ClassDesc *cdesc;
        const NameSpaceDesc *ndesc;
        gint struct_offset;
+       GString *result = NULL;
 
        for (ndesc = namespaces_to_check; ndesc->name; ++ndesc) {
                for (cdesc = ndesc->types; cdesc->name; ++cdesc) {
                        klass = mono_class_from_name (corlib, ndesc->name, cdesc->name);
-                       if (!klass)
-                               return g_strdup_printf ("Cannot find class %s", cdesc->name);
+                       if (!klass) {
+                               if (!result)
+                                       result = g_string_new ("");
+                               g_string_append_printf (result, "Cannot find class %s\n", cdesc->name);
+                               continue;
+                       }
                        mono_class_init (klass);
                        /*
                         * FIXME: we should also check the size of valuetypes, or
                         * we're going to have trouble when we access them in arrays.
                         */
                        if (klass->valuetype)
-                               struct_offset = 8;
+                               struct_offset = sizeof (MonoObject);
                        else
                                struct_offset = 0;
                        for (fdesc = cdesc->fields; fdesc->name; ++fdesc) {
                                field = mono_class_get_field_from_name (klass, fdesc->name);
-                               if (!field || (field->offset != (fdesc->offset + struct_offset)))
-                                       return g_strdup_printf ("field `%s' mismatch in class %s (%ld != %ld)", fdesc->name, cdesc->name, (long) fdesc->offset, (long) (field?field->offset:-1));
+                               if (!field || (field->offset != (fdesc->offset + struct_offset))) {
+                                       if (!result)
+                                               result = g_string_new ("");
+                                       g_string_append_printf (result, "field `%s' mismatch in class %s (%ld + %ld != %ld)\n", fdesc->name, cdesc->name, (long) fdesc->offset, (long)struct_offset, (long) (field?field->offset:-1));
+                               }
                        }
                }
        }
+       if (result)
+               return g_string_free (result, FALSE);
        return NULL;
 }
 
@@ -2566,3 +2648,4 @@ mono_verify_corlib () {
        return check_corlib (mono_defaults.corlib);
 }
 
+