Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1998, 2009, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 # include "incls/_precompiled.incl"

 # include "incls/_verifier.cpp.incl"

 #define NOFAILOVER_MAJOR_VERSION 51

 // Access to external entry for VerifyClassCodes - old byte code verifier

 extern "C" {

   typedef jboolean (*verify_byte_codes_fn_t)(JNIEnv *, jclass, char *, jint);

   typedef jboolean (*verify_byte_codes_fn_new_t)(JNIEnv *, jclass, char *, jint, jint);

 }

 static void* volatile _verify_byte_codes_fn = NULL;

 static volatile jint _is_new_verify_byte_codes_fn = (jint) true;

 static void* verify_byte_codes_fn() {

   if (_verify_byte_codes_fn == NULL) {

     void *lib_handle = os::native_java_library();

     void *func = hpi::dll_lookup(lib_handle, "VerifyClassCodesForMajorVersion");

     OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);

     if (func == NULL) {

       OrderAccess::release_store(&_is_new_verify_byte_codes_fn, false);

       func = hpi::dll_lookup(lib_handle, "VerifyClassCodes");

       OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);

     }

   }

   return (void*)_verify_byte_codes_fn;

 }

 // Methods in Verifier

 bool Verifier::should_verify_for(oop class_loader, bool should_verify_class) {

   return (class_loader == NULL || !should_verify_class) ?

     BytecodeVerificationLocal : BytecodeVerificationRemote;

 }

 bool Verifier::relax_verify_for(oop loader) {

   bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);

   bool need_verify =

     // verifyAll

     (BytecodeVerificationLocal && BytecodeVerificationRemote) ||

     // verifyRemote

     (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);

   return !need_verify;

 }

 bool Verifier::verify(instanceKlassHandle klass, Verifier::Mode mode, bool should_verify_class, TRAPS) {

   ResourceMark rm(THREAD);

   HandleMark hm;

   symbolHandle exception_name;

   const size_t message_buffer_len = klass->name()->utf8_length() + 1024;

   char* message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);

   const char* klassName = klass->external_name();

   // If the class should be verified, first see if we can use the split

   // verifier.  If not, or if verification fails and FailOverToOldVerifier

   // is set, then call the inference verifier.

   if (is_eligible_for_verification(klass, should_verify_class)) {

     if (TraceClassInitialization) {

       tty->print_cr("Start class verification for: %s", klassName);

     }

     if (UseSplitVerifier &&

         klass->major_version() >= STACKMAP_ATTRIBUTE_MAJOR_VERSION) {

         ClassVerifier split_verifier(

           klass, message_buffer, message_buffer_len, THREAD);

         split_verifier.verify_class(THREAD);

         exception_name = split_verifier.result();

       if (klass->major_version() < NOFAILOVER_MAJOR_VERSION &&

           FailOverToOldVerifier && !HAS_PENDING_EXCEPTION &&

           (exception_name == vmSymbols::java_lang_VerifyError() ||

            exception_name == vmSymbols::java_lang_ClassFormatError())) {

         if (TraceClassInitialization) {

           tty->print_cr(

             "Fail over class verification to old verifier for: %s", klassName);

         }

         exception_name = inference_verify(

           klass, message_buffer, message_buffer_len, THREAD);

       }

     } else {

       exception_name = inference_verify(

           klass, message_buffer, message_buffer_len, THREAD);

     }

     if (TraceClassInitialization) {

       if (HAS_PENDING_EXCEPTION) {

         tty->print("Verification for %s has", klassName);

         tty->print_cr(" exception pending %s ",

           instanceKlass::cast(PENDING_EXCEPTION->klass())->external_name());

       } else if (!exception_name.is_null()) {

         tty->print_cr("Verification for %s failed", klassName);

       }

       tty->print_cr("End class verification for: %s", klassName);

     }

   }

   if (HAS_PENDING_EXCEPTION) {

     return false; // use the existing exception

   } else if (exception_name.is_null()) {

     return true; // verifcation succeeded

   } else { // VerifyError or ClassFormatError to be created and thrown

     ResourceMark rm(THREAD);

     instanceKlassHandle kls =

       SystemDictionary::resolve_or_fail(exception_name, true, CHECK_false);

     while (!kls.is_null()) {

       if (kls == klass) {

         // If the class being verified is the exception we're creating

         // or one of it's superclasses, we're in trouble and are going

         // to infinitely recurse when we try to initialize the exception.

         // So bail out here by throwing the preallocated VM error.

         THROW_OOP_(Universe::virtual_machine_error_instance(), false);

       }

       kls = kls->super();

     }

     message_buffer[message_buffer_len - 1] = '\0'; // just to be sure

     THROW_MSG_(exception_name, message_buffer, false);

   }

 }

 bool Verifier::is_eligible_for_verification(instanceKlassHandle klass, bool should_verify_class) {

   symbolOop name = klass->name();

   klassOop refl_magic_klass = SystemDictionary::reflect_MagicAccessorImpl_klass();

   return (should_verify_for(klass->class_loader(), should_verify_class) &&

     // return if the class is a bootstrapping class

     // or defineClass specified not to verify by default (flags override passed arg)

     // We need to skip the following four for bootstraping

     name != vmSymbols::java_lang_Object() &&

     name != vmSymbols::java_lang_Class() &&

     name != vmSymbols::java_lang_String() &&

     name != vmSymbols::java_lang_Throwable() &&

     // Can not verify the bytecodes for shared classes because they have

     // already been rewritten to contain constant pool cache indices,

     // which the verifier can't understand.

     // Shared classes shouldn't have stackmaps either.

     !klass()->is_shared() &&

     // As of the fix for 4486457 we disable verification for all of the

     // dynamically-generated bytecodes associated with the 1.4

     // reflection implementation, not just those associated with

     // sun/reflect/SerializationConstructorAccessor.

     // NOTE: this is called too early in the bootstrapping process to be

     // guarded by Universe::is_gte_jdk14x_version()/UseNewReflection.

     (refl_magic_klass == NULL ||

      !klass->is_subtype_of(refl_magic_klass) ||

      VerifyReflectionBytecodes)

   );

 }

 symbolHandle Verifier::inference_verify(

     instanceKlassHandle klass, char* message, size_t message_len, TRAPS) {

   JavaThread* thread = (JavaThread*)THREAD;

   JNIEnv *env = thread->jni_environment();

   void* verify_func = verify_byte_codes_fn();

   if (verify_func == NULL) {

     jio_snprintf(message, message_len, "Could not link verifier");

     return vmSymbols::java_lang_VerifyError();

   }

   ResourceMark rm(THREAD);

   if (ClassVerifier::_verify_verbose) {

     tty->print_cr("Verifying class %s with old format", klass->external_name());

   }

   jclass cls = (jclass) JNIHandles::make_local(env, klass->java_mirror());

   jint result;

   {

     HandleMark hm(thread);

     ThreadToNativeFromVM ttn(thread);

     // ThreadToNativeFromVM takes care of changing thread_state, so safepoint

     // code knows that we have left the VM

     if (_is_new_verify_byte_codes_fn) {

       verify_byte_codes_fn_new_t func =

         CAST_TO_FN_PTR(verify_byte_codes_fn_new_t, verify_func);

       result = (*func)(env, cls, message, (int)message_len,

           klass->major_version());

     } else {

       verify_byte_codes_fn_t func =

         CAST_TO_FN_PTR(verify_byte_codes_fn_t, verify_func);

       result = (*func)(env, cls, message, (int)message_len);

     }

   }

   JNIHandles::destroy_local(cls);

   // These numbers are chosen so that VerifyClassCodes interface doesn't need

   // to be changed (still return jboolean (unsigned char)), and result is

   // 1 when verification is passed.

   symbolHandle nh(NULL);

   if (result == 0) {

     return vmSymbols::java_lang_VerifyError();

   } else if (result == 1) {

     return nh; // verified.

   } else if (result == 2) {

     THROW_MSG_(vmSymbols::java_lang_OutOfMemoryError(), message, nh);

   } else if (result == 3) {

     return vmSymbols::java_lang_ClassFormatError();

   } else {

     ShouldNotReachHere();

     return nh;

   }

 }

 // Methods in ClassVerifier

 bool ClassVerifier::_verify_verbose = false;

 ClassVerifier::ClassVerifier(

     instanceKlassHandle klass, char* msg, size_t msg_len, TRAPS)

     : _thread(THREAD), _exception_type(symbolHandle()), _message(msg),

       _message_buffer_len(msg_len), _klass(klass) {

   _this_type = VerificationType::reference_type(klass->name());

 }

 ClassVerifier::~ClassVerifier() {

 }

 void ClassVerifier::verify_class(TRAPS) {

   if (_verify_verbose) {

     tty->print_cr("Verifying class %s with new format",

       _klass->external_name());

   }

   objArrayHandle methods(THREAD, _klass->methods());

   int num_methods = methods->length();

   for (int index = 0; index < num_methods; index++) {

     methodOop m = (methodOop)methods->obj_at(index);

     if (m->is_native() || m->is_abstract()) {

       // If m is native or abstract, skip it.  It is checked in class file

       // parser that methods do not override a final method.

       continue;

     }

     verify_method(methodHandle(THREAD, m), CHECK_VERIFY(this));

   }

 }

 void ClassVerifier::verify_method(methodHandle m, TRAPS) {

   ResourceMark rm(THREAD);

   _method = m;   // initialize _method

   if (_verify_verbose) {

     tty->print_cr("Verifying method %s", m->name_and_sig_as_C_string());

   }

   const char* bad_type_msg = "Bad type on operand stack in %s";

   int32_t max_stack = m->max_stack();

   int32_t max_locals = m->max_locals();

   constantPoolHandle cp(THREAD, m->constants());

   if (!SignatureVerifier::is_valid_method_signature(m->signature())) {

     class_format_error("Invalid method signature");

     return;

   }

   // Initial stack map frame: offset is 0, stack is initially empty.

   StackMapFrame current_frame(max_locals, max_stack, this);

   // Set initial locals

   VerificationType return_type = current_frame.set_locals_from_arg(

     m, current_type(), CHECK_VERIFY(this));

   int32_t stackmap_index = 0; // index to the stackmap array

   u4 code_length = m->code_size();

   // Scan the bytecode and map each instruction's start offset to a number.

   char* code_data = generate_code_data(m, code_length, CHECK_VERIFY(this));

   int ex_min = code_length;

   int ex_max = -1;

   // Look through each item on the exception table. Each of the fields must refer

   // to a legal instruction.

   verify_exception_handler_table(

     code_length, code_data, ex_min, ex_max, CHECK_VERIFY(this));

   // Look through each entry on the local variable table and make sure

   // its range of code array offsets is valid. (4169817)

   if (m->has_localvariable_table()) {

     verify_local_variable_table(code_length, code_data, CHECK_VERIFY(this));

   }

   typeArrayHandle stackmap_data(THREAD, m->stackmap_data());

   StackMapStream stream(stackmap_data);

   StackMapReader reader(this, &stream, code_data, code_length, THREAD);

   StackMapTable stackmap_table(&reader, &current_frame, max_locals, max_stack,

                                code_data, code_length, CHECK_VERIFY(this));

   if (_verify_verbose) {

     stackmap_table.print();

   }

   RawBytecodeStream bcs(m);

   // Scan the byte code linearly from the start to the end

   bool no_control_flow = false; // Set to true when there is no direct control

                                 // flow from current instruction to the next

                                 // instruction in sequence

   Bytecodes::Code opcode;

   while (!bcs.is_last_bytecode()) {

     opcode = bcs.raw_next();

     u2 bci = bcs.bci();

     // Set current frame's offset to bci

     current_frame.set_offset(bci);

     // Make sure every offset in stackmap table point to the beginning to

     // an instruction. Match current_frame to stackmap_table entry with

     // the same offset if exists.

     stackmap_index = verify_stackmap_table(

       stackmap_index, bci, &current_frame, &stackmap_table,

       no_control_flow, CHECK_VERIFY(this));

     bool this_uninit = false;  // Set to true when invokespecial <init> initialized 'this'

     // Merge with the next instruction

     {

       u2 index;

       int target;

       VerificationType type, type2;

       VerificationType atype;

 #ifndef PRODUCT

       if (_verify_verbose) {

         current_frame.print();

         tty->print_cr("offset = %d,  opcode = %s", bci, Bytecodes::name(opcode));

       }

 #endif

       // Make sure wide instruction is in correct format

       if (bcs.is_wide()) {

         if (opcode != Bytecodes::_iinc   && opcode != Bytecodes::_iload  &&

             opcode != Bytecodes::_aload  && opcode != Bytecodes::_lload  &&

             opcode != Bytecodes::_istore && opcode != Bytecodes::_astore &&

             opcode != Bytecodes::_lstore && opcode != Bytecodes::_fload  &&

             opcode != Bytecodes::_dload  && opcode != Bytecodes::_fstore &&

             opcode != Bytecodes::_dstore) {

           verify_error(bci, "Bad wide instruction");

           return;

         }

       }

       switch (opcode) {

         case Bytecodes::_nop :

           no_control_flow = false; break;

         case Bytecodes::_aconst_null :

           current_frame.push_stack(

             VerificationType::null_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_iconst_m1 :

         case Bytecodes::_iconst_0 :

         case Bytecodes::_iconst_1 :

         case Bytecodes::_iconst_2 :

         case Bytecodes::_iconst_3 :

         case Bytecodes::_iconst_4 :

         case Bytecodes::_iconst_5 :

           current_frame.push_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_lconst_0 :

         case Bytecodes::_lconst_1 :

           current_frame.push_stack_2(

             VerificationType::long_type(),

             VerificationType::long2_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_fconst_0 :

         case Bytecodes::_fconst_1 :

         case Bytecodes::_fconst_2 :

           current_frame.push_stack(

             VerificationType::float_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_dconst_0 :

         case Bytecodes::_dconst_1 :

           current_frame.push_stack_2(

             VerificationType::double_type(),

             VerificationType::double2_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_sipush :

         case Bytecodes::_bipush :

           current_frame.push_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_ldc :

           verify_ldc(

             opcode, bcs.get_index(), &current_frame,

             cp, bci, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_ldc_w :

         case Bytecodes::_ldc2_w :

           verify_ldc(

             opcode, bcs.get_index_big(), &current_frame,

             cp, bci, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_iload :

           verify_iload(bcs.get_index(), &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_iload_0 :

         case Bytecodes::_iload_1 :

         case Bytecodes::_iload_2 :

         case Bytecodes::_iload_3 :

           index = opcode - Bytecodes::_iload_0;

           verify_iload(index, &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_lload :

           verify_lload(bcs.get_index(), &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_lload_0 :

         case Bytecodes::_lload_1 :

         case Bytecodes::_lload_2 :

         case Bytecodes::_lload_3 :

           index = opcode - Bytecodes::_lload_0;

           verify_lload(index, &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_fload :

           verify_fload(bcs.get_index(), &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_fload_0 :

         case Bytecodes::_fload_1 :

         case Bytecodes::_fload_2 :

         case Bytecodes::_fload_3 :

           index = opcode - Bytecodes::_fload_0;

           verify_fload(index, &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_dload :

           verify_dload(bcs.get_index(), &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_dload_0 :

         case Bytecodes::_dload_1 :

         case Bytecodes::_dload_2 :

         case Bytecodes::_dload_3 :

           index = opcode - Bytecodes::_dload_0;

           verify_dload(index, &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_aload :

           verify_aload(bcs.get_index(), &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_aload_0 :

         case Bytecodes::_aload_1 :

         case Bytecodes::_aload_2 :

         case Bytecodes::_aload_3 :

           index = opcode - Bytecodes::_aload_0;

           verify_aload(index, &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_iaload :

           type = current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           atype = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           if (!atype.is_int_array()) {

             verify_error(bci, bad_type_msg, "iaload");

             return;

           }

           current_frame.push_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_baload :

           type = current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           atype = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           if (!atype.is_bool_array() && !atype.is_byte_array()) {

             verify_error(bci, bad_type_msg, "baload");

             return;

           }

           current_frame.push_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_caload :

           type = current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           atype = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           if (!atype.is_char_array()) {

             verify_error(bci, bad_type_msg, "caload");

             return;

           }

           current_frame.push_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_saload :

           type = current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           atype = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           if (!atype.is_short_array()) {

             verify_error(bci, bad_type_msg, "saload");

             return;

           }

           current_frame.push_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_laload :

           type = current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           atype = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           if (!atype.is_long_array()) {

             verify_error(bci, bad_type_msg, "laload");

             return;

           }

           current_frame.push_stack_2(

             VerificationType::long_type(),

             VerificationType::long2_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_faload :

           type = current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           atype = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           if (!atype.is_float_array()) {

             verify_error(bci, bad_type_msg, "faload");

             return;

           }

           current_frame.push_stack(

             VerificationType::float_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_daload :

           type = current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           atype = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           if (!atype.is_double_array()) {

             verify_error(bci, bad_type_msg, "daload");

             return;

           }

           current_frame.push_stack_2(

             VerificationType::double_type(),

             VerificationType::double2_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_aaload : {

           type = current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           atype = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           if (!atype.is_reference_array()) {

             verify_error(bci, bad_type_msg, "aaload");

             return;

           }

           if (atype.is_null()) {

             current_frame.push_stack(

               VerificationType::null_type(), CHECK_VERIFY(this));

           } else {

             VerificationType component =

               atype.get_component(CHECK_VERIFY(this));

             current_frame.push_stack(component, CHECK_VERIFY(this));

           }

           no_control_flow = false; break;

         }

         case Bytecodes::_istore :

           verify_istore(bcs.get_index(), &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_istore_0 :

         case Bytecodes::_istore_1 :

         case Bytecodes::_istore_2 :

         case Bytecodes::_istore_3 :

           index = opcode - Bytecodes::_istore_0;

           verify_istore(index, &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_lstore :

           verify_lstore(bcs.get_index(), &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_lstore_0 :

         case Bytecodes::_lstore_1 :

         case Bytecodes::_lstore_2 :

         case Bytecodes::_lstore_3 :

           index = opcode - Bytecodes::_lstore_0;

           verify_lstore(index, &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_fstore :

           verify_fstore(bcs.get_index(), &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_fstore_0 :

         case Bytecodes::_fstore_1 :

         case Bytecodes::_fstore_2 :

         case Bytecodes::_fstore_3 :

           index = opcode - Bytecodes::_fstore_0;

           verify_fstore(index, &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_dstore :

           verify_dstore(bcs.get_index(), &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_dstore_0 :

         case Bytecodes::_dstore_1 :

         case Bytecodes::_dstore_2 :

         case Bytecodes::_dstore_3 :

           index = opcode - Bytecodes::_dstore_0;

           verify_dstore(index, &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_astore :

           verify_astore(bcs.get_index(), &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_astore_0 :

         case Bytecodes::_astore_1 :

         case Bytecodes::_astore_2 :

         case Bytecodes::_astore_3 :

           index = opcode - Bytecodes::_astore_0;

           verify_astore(index, &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_iastore :

           type = current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           type2 = current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           atype = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           if (!atype.is_int_array()) {

             verify_error(bci, bad_type_msg, "iastore");

             return;

           }

           no_control_flow = false; break;

         case Bytecodes::_bastore :

           type = current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           type2 = current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           atype = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           if (!atype.is_bool_array() && !atype.is_byte_array()) {

             verify_error(bci, bad_type_msg, "bastore");

             return;

           }

           no_control_flow = false; break;

         case Bytecodes::_castore :

           current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           atype = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           if (!atype.is_char_array()) {

             verify_error(bci, bad_type_msg, "castore");

             return;

           }

           no_control_flow = false; break;

         case Bytecodes::_sastore :

           current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           atype = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           if (!atype.is_short_array()) {

             verify_error(bci, bad_type_msg, "sastore");

             return;

           }

           no_control_flow = false; break;

         case Bytecodes::_lastore :

           current_frame.pop_stack_2(

             VerificationType::long2_type(),

             VerificationType::long_type(), CHECK_VERIFY(this));

           current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           atype = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           if (!atype.is_long_array()) {

             verify_error(bci, bad_type_msg, "lastore");

             return;

           }

           no_control_flow = false; break;

         case Bytecodes::_fastore :

           current_frame.pop_stack(

             VerificationType::float_type(), CHECK_VERIFY(this));

           current_frame.pop_stack

             (VerificationType::integer_type(), CHECK_VERIFY(this));

           atype = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           if (!atype.is_float_array()) {

             verify_error(bci, bad_type_msg, "fastore");

             return;

           }

           no_control_flow = false; break;

         case Bytecodes::_dastore :

           current_frame.pop_stack_2(

             VerificationType::double2_type(),

             VerificationType::double_type(), CHECK_VERIFY(this));

           current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           atype = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           if (!atype.is_double_array()) {

             verify_error(bci, bad_type_msg, "dastore");

             return;

           }

           no_control_flow = false; break;

         case Bytecodes::_aastore :

           type = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           type2 = current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           atype = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           // more type-checking is done at runtime

           if (!atype.is_reference_array()) {

             verify_error(bci, bad_type_msg, "aastore");

             return;

           }

           // 4938384: relaxed constraint in JVMS 3nd edition.

           no_control_flow = false; break;

         case Bytecodes::_pop :

           current_frame.pop_stack(

             VerificationType::category1_check(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_pop2 :

           type = current_frame.pop_stack(CHECK_VERIFY(this));

           if (type.is_category1()) {

             current_frame.pop_stack(

               VerificationType::category1_check(), CHECK_VERIFY(this));

           } else if (type.is_category2_2nd()) {

             current_frame.pop_stack(

               VerificationType::category2_check(), CHECK_VERIFY(this));

           } else {

             verify_error(bci, bad_type_msg, "pop2");

             return;

           }

           no_control_flow = false; break;

         case Bytecodes::_dup :

           type = current_frame.pop_stack(

             VerificationType::category1_check(), CHECK_VERIFY(this));

           current_frame.push_stack(type, CHECK_VERIFY(this));

           current_frame.push_stack(type, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_dup_x1 :

           type = current_frame.pop_stack(

             VerificationType::category1_check(), CHECK_VERIFY(this));

           type2 = current_frame.pop_stack(

             VerificationType::category1_check(), CHECK_VERIFY(this));

           current_frame.push_stack(type, CHECK_VERIFY(this));

           current_frame.push_stack(type2, CHECK_VERIFY(this));

           current_frame.push_stack(type, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_dup_x2 :

         {

           VerificationType type3;

           type = current_frame.pop_stack(

             VerificationType::category1_check(), CHECK_VERIFY(this));

           type2 = current_frame.pop_stack(CHECK_VERIFY(this));

           if (type2.is_category1()) {

             type3 = current_frame.pop_stack(

               VerificationType::category1_check(), CHECK_VERIFY(this));

           } else if (type2.is_category2_2nd()) {

             type3 = current_frame.pop_stack(

               VerificationType::category2_check(), CHECK_VERIFY(this));

           } else {

             verify_error(bci, bad_type_msg, "dup_x2");

             return;

           }

           current_frame.push_stack(type, CHECK_VERIFY(this));

           current_frame.push_stack(type3, CHECK_VERIFY(this));

           current_frame.push_stack(type2, CHECK_VERIFY(this));

           current_frame.push_stack(type, CHECK_VERIFY(this));

           no_control_flow = false; break;

         }

         case Bytecodes::_dup2 :

           type = current_frame.pop_stack(CHECK_VERIFY(this));

           if (type.is_category1()) {

             type2 = current_frame.pop_stack(

               VerificationType::category1_check(), CHECK_VERIFY(this));

           } else if (type.is_category2_2nd()) {

             type2 = current_frame.pop_stack(

               VerificationType::category2_check(), CHECK_VERIFY(this));

           } else {

             verify_error(bci, bad_type_msg, "dup2");

             return;

           }

           current_frame.push_stack(type2, CHECK_VERIFY(this));

           current_frame.push_stack(type, CHECK_VERIFY(this));

           current_frame.push_stack(type2, CHECK_VERIFY(this));

           current_frame.push_stack(type, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_dup2_x1 :

         {

           VerificationType type3;

           type = current_frame.pop_stack(CHECK_VERIFY(this));

           if (type.is_category1()) {

             type2 = current_frame.pop_stack(

               VerificationType::category1_check(), CHECK_VERIFY(this));

           } else if(type.is_category2_2nd()) {

             type2 = current_frame.pop_stack

               (VerificationType::category2_check(), CHECK_VERIFY(this));

           } else {

             verify_error(bci, bad_type_msg, "dup2_x1");

             return;

           }

           type3 = current_frame.pop_stack(

             VerificationType::category1_check(), CHECK_VERIFY(this));

           current_frame.push_stack(type2, CHECK_VERIFY(this));

           current_frame.push_stack(type, CHECK_VERIFY(this));

           current_frame.push_stack(type3, CHECK_VERIFY(this));

           current_frame.push_stack(type2, CHECK_VERIFY(this));

           current_frame.push_stack(type, CHECK_VERIFY(this));

           no_control_flow = false; break;

         }

         case Bytecodes::_dup2_x2 :

         {

           VerificationType type3, type4;

           type = current_frame.pop_stack(CHECK_VERIFY(this));

           if (type.is_category1()) {

             type2 = current_frame.pop_stack(

               VerificationType::category1_check(), CHECK_VERIFY(this));

           } else if (type.is_category2_2nd()) {

             type2 = current_frame.pop_stack(

               VerificationType::category2_check(), CHECK_VERIFY(this));

           } else {

             verify_error(bci, bad_type_msg, "dup2_x2");

             return;

           }

           type3 = current_frame.pop_stack(CHECK_VERIFY(this));

           if (type3.is_category1()) {

             type4 = current_frame.pop_stack(

               VerificationType::category1_check(), CHECK_VERIFY(this));

           } else if (type3.is_category2_2nd()) {

             type4 = current_frame.pop_stack(

               VerificationType::category2_check(), CHECK_VERIFY(this));

           } else {

             verify_error(bci, bad_type_msg, "dup2_x2");

             return;

           }

           current_frame.push_stack(type2, CHECK_VERIFY(this));

           current_frame.push_stack(type, CHECK_VERIFY(this));

           current_frame.push_stack(type4, CHECK_VERIFY(this));

           current_frame.push_stack(type3, CHECK_VERIFY(this));

           current_frame.push_stack(type2, CHECK_VERIFY(this));

           current_frame.push_stack(type, CHECK_VERIFY(this));

           no_control_flow = false; break;

         }

         case Bytecodes::_swap :

           type = current_frame.pop_stack(

             VerificationType::category1_check(), CHECK_VERIFY(this));

           type2 = current_frame.pop_stack(

             VerificationType::category1_check(), CHECK_VERIFY(this));

           current_frame.push_stack(type, CHECK_VERIFY(this));

           current_frame.push_stack(type2, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_iadd :

         case Bytecodes::_isub :

         case Bytecodes::_imul :

         case Bytecodes::_idiv :

         case Bytecodes::_irem :

         case Bytecodes::_ishl :

         case Bytecodes::_ishr :

         case Bytecodes::_iushr :

         case Bytecodes::_ior :

         case Bytecodes::_ixor :

         case Bytecodes::_iand :

           current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           // fall through

         case Bytecodes::_ineg :

           current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           current_frame.push_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_ladd :

         case Bytecodes::_lsub :

         case Bytecodes::_lmul :

         case Bytecodes::_ldiv :

         case Bytecodes::_lrem :

         case Bytecodes::_land :

         case Bytecodes::_lor :

         case Bytecodes::_lxor :

           current_frame.pop_stack_2(

             VerificationType::long2_type(),

             VerificationType::long_type(), CHECK_VERIFY(this));

           // fall through

         case Bytecodes::_lneg :

           current_frame.pop_stack_2(

             VerificationType::long2_type(),

             VerificationType::long_type(), CHECK_VERIFY(this));

           current_frame.push_stack_2(

             VerificationType::long_type(),

             VerificationType::long2_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_lshl :

         case Bytecodes::_lshr :

         case Bytecodes::_lushr :

           current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           current_frame.pop_stack_2(

             VerificationType::long2_type(),

             VerificationType::long_type(), CHECK_VERIFY(this));

           current_frame.push_stack_2(

             VerificationType::long_type(),

             VerificationType::long2_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_fadd :

         case Bytecodes::_fsub :

         case Bytecodes::_fmul :

         case Bytecodes::_fdiv :

         case Bytecodes::_frem :

           current_frame.pop_stack(

             VerificationType::float_type(), CHECK_VERIFY(this));

           // fall through

         case Bytecodes::_fneg :

           current_frame.pop_stack(

             VerificationType::float_type(), CHECK_VERIFY(this));

           current_frame.push_stack(

             VerificationType::float_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_dadd :

         case Bytecodes::_dsub :

         case Bytecodes::_dmul :

         case Bytecodes::_ddiv :

         case Bytecodes::_drem :

           current_frame.pop_stack_2(

             VerificationType::double2_type(),

             VerificationType::double_type(), CHECK_VERIFY(this));

           // fall through

         case Bytecodes::_dneg :

           current_frame.pop_stack_2(

             VerificationType::double2_type(),

             VerificationType::double_type(), CHECK_VERIFY(this));

           current_frame.push_stack_2(

             VerificationType::double_type(),

             VerificationType::double2_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_iinc :

           verify_iinc(bcs.get_index(), &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_i2l :

           type = current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           current_frame.push_stack_2(

             VerificationType::long_type(),

             VerificationType::long2_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

        case Bytecodes::_l2i :

           current_frame.pop_stack_2(

             VerificationType::long2_type(),

             VerificationType::long_type(), CHECK_VERIFY(this));

           current_frame.push_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_i2f :

           current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           current_frame.push_stack(

             VerificationType::float_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_i2d :

           current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           current_frame.push_stack_2(

             VerificationType::double_type(),

             VerificationType::double2_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_l2f :

           current_frame.pop_stack_2(

             VerificationType::long2_type(),

             VerificationType::long_type(), CHECK_VERIFY(this));

           current_frame.push_stack(

             VerificationType::float_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_l2d :

           current_frame.pop_stack_2(

             VerificationType::long2_type(),

             VerificationType::long_type(), CHECK_VERIFY(this));

           current_frame.push_stack_2(

             VerificationType::double_type(),

             VerificationType::double2_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_f2i :

           current_frame.pop_stack(

             VerificationType::float_type(), CHECK_VERIFY(this));

           current_frame.push_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_f2l :

           current_frame.pop_stack(

             VerificationType::float_type(), CHECK_VERIFY(this));

           current_frame.push_stack_2(

             VerificationType::long_type(),

             VerificationType::long2_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_f2d :

           current_frame.pop_stack(

             VerificationType::float_type(), CHECK_VERIFY(this));

           current_frame.push_stack_2(

             VerificationType::double_type(),

             VerificationType::double2_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_d2i :

           current_frame.pop_stack_2(

             VerificationType::double2_type(),

             VerificationType::double_type(), CHECK_VERIFY(this));

           current_frame.push_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_d2l :

           current_frame.pop_stack_2(

             VerificationType::double2_type(),

             VerificationType::double_type(), CHECK_VERIFY(this));

           current_frame.push_stack_2(

             VerificationType::long_type(),

             VerificationType::long2_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_d2f :

           current_frame.pop_stack_2(

             VerificationType::double2_type(),

             VerificationType::double_type(), CHECK_VERIFY(this));

           current_frame.push_stack(

             VerificationType::float_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_i2b :

         case Bytecodes::_i2c :

         case Bytecodes::_i2s :

           current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           current_frame.push_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_lcmp :

           current_frame.pop_stack_2(

             VerificationType::long2_type(),

             VerificationType::long_type(), CHECK_VERIFY(this));

           current_frame.pop_stack_2(

             VerificationType::long2_type(),

             VerificationType::long_type(), CHECK_VERIFY(this));

           current_frame.push_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_fcmpl :

         case Bytecodes::_fcmpg :

           current_frame.pop_stack(

             VerificationType::float_type(), CHECK_VERIFY(this));

           current_frame.pop_stack(

             VerificationType::float_type(), CHECK_VERIFY(this));

           current_frame.push_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_dcmpl :

         case Bytecodes::_dcmpg :

           current_frame.pop_stack_2(

             VerificationType::double2_type(),

             VerificationType::double_type(), CHECK_VERIFY(this));

           current_frame.pop_stack_2(

             VerificationType::double2_type(),

             VerificationType::double_type(), CHECK_VERIFY(this));

           current_frame.push_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_if_icmpeq:

         case Bytecodes::_if_icmpne:

         case Bytecodes::_if_icmplt:

         case Bytecodes::_if_icmpge:

         case Bytecodes::_if_icmpgt:

         case Bytecodes::_if_icmple:

           current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           // fall through

         case Bytecodes::_ifeq:

         case Bytecodes::_ifne:

         case Bytecodes::_iflt:

         case Bytecodes::_ifge:

         case Bytecodes::_ifgt:

         case Bytecodes::_ifle:

           current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           target = bcs.dest();

           stackmap_table.check_jump_target(

             &current_frame, target, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_if_acmpeq :

         case Bytecodes::_if_acmpne :

           current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           // fall through

         case Bytecodes::_ifnull :

         case Bytecodes::_ifnonnull :

           current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           target = bcs.dest();

           stackmap_table.check_jump_target

             (&current_frame, target, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_goto :

           target = bcs.dest();

           stackmap_table.check_jump_target(

             &current_frame, target, CHECK_VERIFY(this));

           no_control_flow = true; break;

         case Bytecodes::_goto_w :

           target = bcs.dest_w();

           stackmap_table.check_jump_target(

             &current_frame, target, CHECK_VERIFY(this));

           no_control_flow = true; break;

         case Bytecodes::_tableswitch :

         case Bytecodes::_lookupswitch :

           verify_switch(

             &bcs, code_length, code_data, &current_frame,

             &stackmap_table, CHECK_VERIFY(this));

           no_control_flow = true; break;

         case Bytecodes::_ireturn :

           type = current_frame.pop_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           verify_return_value(return_type, type, bci, CHECK_VERIFY(this));

           no_control_flow = true; break;

         case Bytecodes::_lreturn :

           type2 = current_frame.pop_stack(

             VerificationType::long2_type(), CHECK_VERIFY(this));

           type = current_frame.pop_stack(

             VerificationType::long_type(), CHECK_VERIFY(this));

           verify_return_value(return_type, type, bci, CHECK_VERIFY(this));

           no_control_flow = true; break;

         case Bytecodes::_freturn :

           type = current_frame.pop_stack(

             VerificationType::float_type(), CHECK_VERIFY(this));

           verify_return_value(return_type, type, bci, CHECK_VERIFY(this));

           no_control_flow = true; break;

         case Bytecodes::_dreturn :

           type2 = current_frame.pop_stack(

             VerificationType::double2_type(),  CHECK_VERIFY(this));

           type = current_frame.pop_stack(

             VerificationType::double_type(), CHECK_VERIFY(this));

           verify_return_value(return_type, type, bci, CHECK_VERIFY(this));

           no_control_flow = true; break;

         case Bytecodes::_areturn :

           type = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           verify_return_value(return_type, type, bci, CHECK_VERIFY(this));

           no_control_flow = true; break;

         case Bytecodes::_return :

           if (return_type != VerificationType::bogus_type()) {

             verify_error(bci, "Method expects no return value");

             return;

           }

           // Make sure "this" has been initialized if current method is an

           // <init>

           if (_method->name() == vmSymbols::object_initializer_name() &&

               current_frame.flag_this_uninit()) {

             verify_error(bci,

               "Constructor must call super() or this() before return");

             return;

           }

           no_control_flow = true; break;

         case Bytecodes::_getstatic :

         case Bytecodes::_putstatic :

         case Bytecodes::_getfield :

         case Bytecodes::_putfield :

           verify_field_instructions(

             &bcs, &current_frame, cp, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_invokevirtual :

         case Bytecodes::_invokespecial :

         case Bytecodes::_invokestatic :

           verify_invoke_instructions(

             &bcs, code_length, &current_frame,

             &this_uninit, return_type, cp, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_invokeinterface :

         case Bytecodes::_invokedynamic :

           verify_invoke_instructions(

             &bcs, code_length, &current_frame,

             &this_uninit, return_type, cp, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_new :

         {

           index = bcs.get_index_big();

           verify_cp_class_type(index, cp, CHECK_VERIFY(this));

           VerificationType new_class_type =

             cp_index_to_type(index, cp, CHECK_VERIFY(this));

           if (!new_class_type.is_object()) {

             verify_error(bci, "Illegal new instruction");

             return;

           }

           type = VerificationType::uninitialized_type(bci);

           current_frame.push_stack(type, CHECK_VERIFY(this));

           no_control_flow = false; break;

         }

         case Bytecodes::_newarray :

           type = get_newarray_type(bcs.get_index(), bci, CHECK_VERIFY(this));

           current_frame.pop_stack(

             VerificationType::integer_type(),  CHECK_VERIFY(this));

           current_frame.push_stack(type, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_anewarray :

           verify_anewarray(

             bcs.get_index_big(), cp, &current_frame, CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_arraylength :

           type = current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           if (!(type.is_null() || type.is_array())) {

             verify_error(bci, bad_type_msg, "arraylength");

           }

           current_frame.push_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_checkcast :

         {

           index = bcs.get_index_big();

           verify_cp_class_type(index, cp, CHECK_VERIFY(this));

           current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           VerificationType klass_type = cp_index_to_type(

             index, cp, CHECK_VERIFY(this));

           current_frame.push_stack(klass_type, CHECK_VERIFY(this));

           no_control_flow = false; break;

         }

         case Bytecodes::_instanceof : {

           index = bcs.get_index_big();

           verify_cp_class_type(index, cp, CHECK_VERIFY(this));

           current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           current_frame.push_stack(

             VerificationType::integer_type(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         }

         case Bytecodes::_monitorenter :

         case Bytecodes::_monitorexit :

           current_frame.pop_stack(

             VerificationType::reference_check(), CHECK_VERIFY(this));

           no_control_flow = false; break;

         case Bytecodes::_multianewarray :

         {

           index = bcs.get_index_big();

           u2 dim = *(bcs.bcp()+3);

           verify_cp_class_type(index, cp, CHECK_VERIFY(this));

           VerificationType new_array_type =

             cp_index_to_type(index, cp, CHECK_VERIFY(this));

           if (!new_array_type.is_array()) {

             verify_error(bci,

               "Illegal constant pool index in multianewarray instruction");

             return;

           }

           if (dim < 1 || new_array_type.dimensions() < dim) {

             verify_error(bci,

               "Illegal dimension in multianewarray instruction");

             return;

           }

           for (int i = 0; i < dim; i++) {

             current_frame.pop_stack(

               VerificationType::integer_type(), CHECK_VERIFY(this));

           }

           current_frame.push_stack(new_array_type, CHECK_VERIFY(this));

           no_control_flow = false; break;

         }

         case Bytecodes::_athrow :

           type = VerificationType::reference_type(

             vmSymbols::java_lang_Throwable());

           current_frame.pop_stack(type, CHECK_VERIFY(this));

           no_control_flow = true; break;

         default:

           // We only need to check the valid bytecodes in class file.

           // And jsr and ret are not in the new class file format in JDK1.5.

           verify_error(bci, "Bad instruction");

           no_control_flow = false;

           return;

       }  // end switch

     }  // end Merge with the next instruction

     // Look for possible jump target in exception handlers and see if it

     // matches current_frame

     if (bci >= ex_min && bci < ex_max) {

       verify_exception_handler_targets(

         bci, this_uninit, &current_frame, &stackmap_table, CHECK_VERIFY(this));

     }

   } // end while

   // Make sure that control flow does not fall through end of the method

   if (!no_control_flow) {

     verify_error(code_length, "Control flow falls through code end");

     return;

   }

 }

 char* ClassVerifier::generate_code_data(methodHandle m, u4 code_length, TRAPS) {

   char* code_data = NEW_RESOURCE_ARRAY(char, code_length);

   memset(code_data, 0, sizeof(char) * code_length);

   RawBytecodeStream bcs(m);

   while (!bcs.is_last_bytecode()) {

     if (bcs.raw_next() != Bytecodes::_illegal) {

       int bci = bcs.bci();

       if (bcs.code() == Bytecodes::_new) {

         code_data[bci] = NEW_OFFSET;

       } else {

         code_data[bci] = BYTECODE_OFFSET;

       }

     } else {

       verify_error(bcs.bci(), "Bad instruction");

       return NULL;

     }

   }

   return code_data;

 }

 void ClassVerifier::verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS) {

   typeArrayHandle exhandlers (THREAD, _method->exception_table());

   constantPoolHandle cp (THREAD, _method->constants());

   if (exhandlers() != NULL) {

     for(int i = 0; i < exhandlers->length();) {

       u2 start_pc = exhandlers->int_at(i++);

       u2 end_pc = exhandlers->int_at(i++);

       u2 handler_pc = exhandlers->int_at(i++);

       if (start_pc >= code_length || code_data[start_pc] == 0) {

         class_format_error("Illegal exception table start_pc %d", start_pc);

         return;

       }

       if (end_pc != code_length) {   // special case: end_pc == code_length

         if (end_pc > code_length || code_data[end_pc] == 0) {

           class_format_error("Illegal exception table end_pc %d", end_pc);

           return;

         }

       }

       if (handler_pc >= code_length || code_data[handler_pc] == 0) {

         class_format_error("Illegal exception table handler_pc %d", handler_pc);

         return;

       }

       int catch_type_index = exhandlers->int_at(i++);

       if (catch_type_index != 0) {

         VerificationType catch_type = cp_index_to_type(

           catch_type_index, cp, CHECK_VERIFY(this));

         VerificationType throwable =

           VerificationType::reference_type(vmSymbols::java_lang_Throwable());

         bool is_subclass = throwable.is_assignable_from(

           catch_type, current_class(), CHECK_VERIFY(this));

         if (!is_subclass) {

           // 4286534: should throw VerifyError according to recent spec change

           verify_error(

             "Catch type is not a subclass of Throwable in handler %d",

             handler_pc);

           return;

         }

       }

       if (start_pc < min) min = start_pc;

       if (end_pc > max) max = end_pc;

     }

   }

 }

 void ClassVerifier::verify_local_variable_table(u4 code_length, char* code_data, TRAPS) {

   int localvariable_table_length = _method()->localvariable_table_length();

   if (localvariable_table_length > 0) {

     LocalVariableTableElement* table = _method()->localvariable_table_start();

     for (int i = 0; i < localvariable_table_length; i++) {

       u2 start_bci = table[i].start_bci;

       u2 length = table[i].length;

       if (start_bci >= code_length || code_data[start_bci] == 0) {

         class_format_error(

           "Illegal local variable table start_pc %d", start_bci);

         return;

       }

       u4 end_bci = (u4)(start_bci + length);

       if (end_bci != code_length) {

         if (end_bci >= code_length || code_data[end_bci] == 0) {

           class_format_error( "Illegal local variable table length %d", length);

           return;

         }

       }

     }

   }

 }

 u2 ClassVerifier::verify_stackmap_table(u2 stackmap_index, u2 bci,

                                         StackMapFrame* current_frame,

                                         StackMapTable* stackmap_table,

                                         bool no_control_flow, TRAPS) {

   if (stackmap_index < stackmap_table->get_frame_count()) {

     u2 this_offset = stackmap_table->get_offset(stackmap_index);

     if (no_control_flow && this_offset > bci) {

       verify_error(bci, "Expecting a stack map frame");

       return 0;

     }

     if (this_offset == bci) {

       // See if current stack map can be assigned to the frame in table.

       // current_frame is the stackmap frame got from the last instruction.

       // If matched, current_frame will be updated by this method.

       bool match = stackmap_table->match_stackmap(

         current_frame, this_offset, stackmap_index,

         !no_control_flow, true, CHECK_VERIFY_(this, 0));

       if (!match) {

         // report type error

         verify_error(bci, "Instruction type does not match stack map");

         return 0;

       }

       stackmap_index++;

     } else if (this_offset < bci) {

       // current_offset should have met this_offset.

       class_format_error("Bad stack map offset %d", this_offset);

       return 0;

     }

   } else if (no_control_flow) {

     verify_error(bci, "Expecting a stack map frame");

     return 0;

   }

   return stackmap_index;

 }

 void ClassVerifier::verify_exception_handler_targets(u2 bci, bool this_uninit, StackMapFrame* current_frame,

                                                      StackMapTable* stackmap_table, TRAPS) {

   constantPoolHandle cp (THREAD, _method->constants());

   typeArrayHandle exhandlers (THREAD, _method->exception_table());

   if (exhandlers() != NULL) {

     for(int i = 0; i < exhandlers->length();) {

       u2 start_pc = exhandlers->int_at(i++);

       u2 end_pc = exhandlers->int_at(i++);

       u2 handler_pc = exhandlers->int_at(i++);

       int catch_type_index = exhandlers->int_at(i++);

       if(bci >= start_pc && bci < end_pc) {

         u1 flags = current_frame->flags();

         if (this_uninit) {  flags |= FLAG_THIS_UNINIT; }

         ResourceMark rm(THREAD);

         StackMapFrame* new_frame = current_frame->frame_in_exception_handler(flags);

         if (catch_type_index != 0) {

           // We know that this index refers to a subclass of Throwable

           VerificationType catch_type = cp_index_to_type(

             catch_type_index, cp, CHECK_VERIFY(this));

           new_frame->push_stack(catch_type, CHECK_VERIFY(this));

         } else {

           VerificationType throwable =

             VerificationType::reference_type(vmSymbols::java_lang_Throwable());

           new_frame->push_stack(throwable, CHECK_VERIFY(this));

         }

         bool match = stackmap_table->match_stackmap(

           new_frame, handler_pc, true, false, CHECK_VERIFY(this));

         if (!match) {

           verify_error(bci,

             "Stack map does not match the one at exception handler %d",

             handler_pc);

           return;

         }

       }

     }

   }

 }

 void ClassVerifier::verify_cp_index(constantPoolHandle cp, int index, TRAPS) {

   int nconstants = cp->length();

   if ((index <= 0) || (index >= nconstants)) {

     verify_error("Illegal constant pool index %d in class %s",

       index, instanceKlass::cast(cp->pool_holder())->external_name());

     return;

   }

 }

 void ClassVerifier::verify_cp_type(

     int index, constantPoolHandle cp, unsigned int types, TRAPS) {

   // In some situations, bytecode rewriting may occur while we're verifying.

   // In this case, a constant pool cache exists and some indices refer to that

   // instead.  Get the original index for the tag check

   constantPoolCacheOop cache = cp->cache();

   if (cache != NULL &&

        ((types == (1 <<  JVM_CONSTANT_InterfaceMethodref)) ||

         (types == (1 <<  JVM_CONSTANT_Methodref)) ||

         (types == (1 <<  JVM_CONSTANT_Fieldref)))) {

     int native_index = index;

     if (Bytes::is_Java_byte_ordering_different()) {

       native_index = Bytes::swap_u2(index);

     }

     assert((native_index >= 0) && (native_index < cache->length()),

       "Must be a legal index into the cp cache");

     index = cache->entry_at(native_index)->constant_pool_index();

   }

   verify_cp_index(cp, index, CHECK_VERIFY(this));

   unsigned int tag = cp->tag_at(index).value();

   if ((types & (1 << tag)) == 0) {

     verify_error(

       "Illegal type at constant pool entry %d in class %s",

       index, instanceKlass::cast(cp->pool_holder())->external_name());

     return;

   }

 }

 void ClassVerifier::verify_cp_class_type(

     int index, constantPoolHandle cp, TRAPS) {

   verify_cp_index(cp, index, CHECK_VERIFY(this));

   constantTag tag = cp->tag_at(index);

   if (!tag.is_klass() && !tag.is_unresolved_klass()) {

     verify_error("Illegal type at constant pool entry %d in class %s",

       index, instanceKlass::cast(cp->pool_holder())->external_name());

     return;

   }

 }

 void ClassVerifier::format_error_message(

     const char* fmt, int offset, va_list va) {

   ResourceMark rm(_thread);

   stringStream message(_message, _message_buffer_len);

   message.vprint(fmt, va);

   if (!_method.is_null()) {

     message.print(" in method %s", _method->name_and_sig_as_C_string());

   }

   if (offset != -1) {

     message.print(" at offset %d", offset);

   }

 }

 void ClassVerifier::verify_error(u2 offset, const char* fmt, ...) {

   _exception_type = vmSymbols::java_lang_VerifyError();

   va_list va;

   va_start(va, fmt);

   format_error_message(fmt, offset, va);

   va_end(va);

 }

 void ClassVerifier::verify_error(const char* fmt, ...) {

   _exception_type = vmSymbols::java_lang_VerifyError();

   va_list va;

   va_start(va, fmt);

   format_error_message(fmt, -1, va);

   va_end(va);

 }

 void ClassVerifier::class_format_error(const char* msg, ...) {

   _exception_type = vmSymbols::java_lang_ClassFormatError();

   va_list va;

   va_start(va, msg);

   format_error_message(msg, -1, va);

   va_end(va);

 }

 klassOop ClassVerifier::load_class(symbolHandle name, TRAPS) {

   // Get current loader and protection domain first.

   oop loader = current_class()->class_loader();

   oop protection_domain = current_class()->protection_domain();

   return SystemDictionary::resolve_or_fail(

     name, Handle(THREAD, loader), Handle(THREAD, protection_domain),

     true, CHECK_NULL);

 }

 bool ClassVerifier::is_protected_access(instanceKlassHandle this_class,

                                         klassOop target_class,

                                         symbolOop field_name,

                                         symbolOop field_sig,

                                         bool is_method) {

   No_Safepoint_Verifier nosafepoint;

   // If target class isn't a super class of this class, we don't worry about this case

   if (!this_class->is_subclass_of(target_class)) {

     return false;

   }

   // Check if the specified method or field is protected

   instanceKlass* target_instance = instanceKlass::cast(target_class);

   fieldDescriptor fd;

   if (is_method) {

     methodOop m = target_instance->uncached_lookup_method(field_name, field_sig);

     if (m != NULL && m->is_protected()) {

       if (!this_class->is_same_class_package(m->method_holder())) {

         return true;

       }

     }

   } else {

     klassOop member_klass = target_instance->find_field(field_name, field_sig, &fd);

     if(member_klass != NULL && fd.is_protected()) {

       if (!this_class->is_same_class_package(member_klass)) {

         return true;

       }

     }

   }

   return false;

 }

 void ClassVerifier::verify_ldc(

     int opcode, u2 index, StackMapFrame *current_frame,

      constantPoolHandle cp, u2 bci, TRAPS) {

   verify_cp_index(cp, index, CHECK_VERIFY(this));

   constantTag tag = cp->tag_at(index);

   unsigned int types;

   if (opcode == Bytecodes::_ldc || opcode == Bytecodes::_ldc_w) {

     if (!tag.is_unresolved_string() && !tag.is_unresolved_klass()) {

       types = (1 << JVM_CONSTANT_Integer) | (1 << JVM_CONSTANT_Float)

             | (1 << JVM_CONSTANT_String)  | (1 << JVM_CONSTANT_Class);

       verify_cp_type(index, cp, types, CHECK_VERIFY(this));

     }

   } else {

     assert(opcode == Bytecodes::_ldc2_w, "must be ldc2_w");

     types = (1 << JVM_CONSTANT_Double) | (1 << JVM_CONSTANT_Long);

     verify_cp_type(index, cp, types, CHECK_VERIFY(this));

   }

   if (tag.is_string() && cp->is_pseudo_string_at(index)) {

     current_frame->push_stack(

       VerificationType::reference_type(

         vmSymbols::java_lang_Object()), CHECK_VERIFY(this));

   } else if (tag.is_string() || tag.is_unresolved_string()) {

     current_frame->push_stack(

       VerificationType::reference_type(

         vmSymbols::java_lang_String()), CHECK_VERIFY(this));

   } else if (tag.is_klass() || tag.is_unresolved_klass()) {

     current_frame->push_stack(

       VerificationType::reference_type(

         vmSymbols::java_lang_Class()), CHECK_VERIFY(this));

   } else if (tag.is_int()) {

     current_frame->push_stack(

       VerificationType::integer_type(), CHECK_VERIFY(this));

   } else if (tag.is_float()) {

     current_frame->push_stack(

       VerificationType::float_type(), CHECK_VERIFY(this));

   } else if (tag.is_double()) {

     current_frame->push_stack_2(

       VerificationType::double_type(),

       VerificationType::double2_type(), CHECK_VERIFY(this));

   } else if (tag.is_long()) {

     current_frame->push_stack_2(

       VerificationType::long_type(),

       VerificationType::long2_type(), CHECK_VERIFY(this));

   } else {

     verify_error(bci, "Invalid index in ldc");

     return;

   }

 }

 void ClassVerifier::verify_switch(

     RawBytecodeStream* bcs, u4 code_length, char* code_data,

     StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS) {

   int bci = bcs->bci();

   address bcp = bcs->bcp();

   address aligned_bcp = (address) round_to((intptr_t)(bcp + 1), jintSize);

   // 4639449 & 4647081: padding bytes must be 0

   u2 padding_offset = 1;

   while ((bcp + padding_offset) < aligned_bcp) {

     if(*(bcp + padding_offset) != 0) {

       verify_error(bci, "Nonzero padding byte in lookswitch or tableswitch");

       return;

     }

     padding_offset++;

   }

   int default_offset = (int) Bytes::get_Java_u4(aligned_bcp);

   int keys, delta;

   current_frame->pop_stack(

     VerificationType::integer_type(), CHECK_VERIFY(this));

   if (bcs->code() == Bytecodes::_tableswitch) {

     jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);

     jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);

     if (low > high) {

       verify_error(bci,

         "low must be less than or equal to high in tableswitch");

       return;

     }

     keys = high - low + 1;

     if (keys < 0) {

       verify_error(bci, "too many keys in tableswitch");

       return;

     }

     delta = 1;

   } else {

     keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);

     if (keys < 0) {

       verify_error(bci, "number of keys in lookupswitch less than 0");

       return;

     }

     delta = 2;

     // Make sure that the lookupswitch items are sorted

     for (int i = 0; i < (keys - 1); i++) {

       jint this_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i)*jintSize);

       jint next_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i+2)*jintSize);

       if (this_key >= next_key) {

         verify_error(bci, "Bad lookupswitch instruction");

         return;

       }

     }

   }

   int target = bci + default_offset;

   stackmap_table->check_jump_target(current_frame, target, CHECK_VERIFY(this));

   for (int i = 0; i < keys; i++) {

     target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);

     stackmap_table->check_jump_target(

       current_frame, target, CHECK_VERIFY(this));

   }

 }

 bool ClassVerifier::name_in_supers(

     symbolOop ref_name, instanceKlassHandle current) {

   klassOop super = current->super();

   while (super != NULL) {

     if (super->klass_part()->name() == ref_name) {

       return true;

     }

     super = super->klass_part()->super();

   }

   return false;

 }

 void ClassVerifier::verify_field_instructions(RawBytecodeStream* bcs,

                                               StackMapFrame* current_frame,

                                               constantPoolHandle cp,

                                               TRAPS) {

   u2 index = bcs->get_index_big();

   verify_cp_type(index, cp, 1 << JVM_CONSTANT_Fieldref, CHECK_VERIFY(this));

   // Get field name and signature

   symbolHandle field_name = symbolHandle(THREAD, cp->name_ref_at(index));

   symbolHandle field_sig = symbolHandle(THREAD, cp->signature_ref_at(index));

   if (!SignatureVerifier::is_valid_type_signature(field_sig)) {

     class_format_error(

       "Invalid signature for field in class %s referenced "

       "from constant pool index %d", _klass->external_name(), index);

     return;

   }

   // Get referenced class type

   VerificationType ref_class_type = cp_ref_index_to_type(

     index, cp, CHECK_VERIFY(this));

   if (!ref_class_type.is_object()) {

     verify_error(

       "Expecting reference to class in class %s at constant pool index %d",

       _klass->external_name(), index);

     return;

   }

   VerificationType target_class_type = ref_class_type;

   assert(sizeof(VerificationType) == sizeof(uintptr_t),

         "buffer type must match VerificationType size");

   uintptr_t field_type_buffer[2];

   VerificationType* field_type = (VerificationType*)field_type_buffer;

   // If we make a VerificationType[2] array directly, the compiler calls

   // to the c-runtime library to do the allocation instead of just

   // stack allocating it.  Plus it would run constructors.  This shows up

   // in performance profiles.

   SignatureStream sig_stream(field_sig, false);

   VerificationType stack_object_type;

   int n = change_sig_to_verificationType(

     &sig_stream, field_type, CHECK_VERIFY(this));

   u2 bci = bcs->bci();

   bool is_assignable;

   switch (bcs->code()) {

     case Bytecodes::_getstatic: {

       for (int i = 0; i < n; i++) {

         current_frame->push_stack(field_type[i], CHECK_VERIFY(this));

       }

       break;

     }

     case Bytecodes::_putstatic: {

       for (int i = n - 1; i >= 0; i--) {

         current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));

       }

       break;

     }

     case Bytecodes::_getfield: {

       stack_object_type = current_frame->pop_stack(

         target_class_type, CHECK_VERIFY(this));

       for (int i = 0; i < n; i++) {

         current_frame->push_stack(field_type[i], CHECK_VERIFY(this));

       }

       goto check_protected;

     }

     case Bytecodes::_putfield: {

       for (int i = n - 1; i >= 0; i--) {

         current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));

       }

       stack_object_type = current_frame->pop_stack(CHECK_VERIFY(this));

       // The JVMS 2nd edition allows field initialization before the superclass

       // initializer, if the field is defined within the current class.

       fieldDescriptor fd;

       if (stack_object_type == VerificationType::uninitialized_this_type() &&

           target_class_type.equals(current_type()) &&

           _klass->find_local_field(field_name(), field_sig(), &fd)) {

         stack_object_type = current_type();

       }

       is_assignable = target_class_type.is_assignable_from(

         stack_object_type, current_class(), CHECK_VERIFY(this));

       if (!is_assignable) {

         verify_error(bci, "Bad type on operand stack in putfield");

         return;

       }

     }

     check_protected: {

       if (_this_type == stack_object_type)

         break; // stack_object_type must be assignable to _current_class_type

       symbolHandle ref_class_name = symbolHandle(THREAD,

         cp->klass_name_at(cp->klass_ref_index_at(index)));

       if (!name_in_supers(ref_class_name(), current_class()))

         // stack_object_type must be assignable to _current_class_type since:

         // 1. stack_object_type must be assignable to ref_class.

         // 2. ref_class must be _current_class or a subclass of it. It can't

         //    be a superclass of it. See revised JVMS 5.4.4.

         break;

       klassOop ref_class_oop = load_class(ref_class_name, CHECK);

       if (is_protected_access(current_class(), ref_class_oop, field_name(),

                               field_sig(), false)) {

         // It's protected access, check if stack object is assignable to

         // current class.

         is_assignable = current_type().is_assignable_from(

           stack_object_type, current_class(), CHECK_VERIFY(this));

         if (!is_assignable) {

           verify_error(bci, "Bad access to protected data in getfield");

           return;

         }

       }

       break;

     }

     default: ShouldNotReachHere();

   }

 }

 void ClassVerifier::verify_invoke_init(

     RawBytecodeStream* bcs, VerificationType ref_class_type,

     StackMapFrame* current_frame, u4 code_length, bool *this_uninit,

     constantPoolHandle cp, TRAPS) {

   u2 bci = bcs->bci();

   VerificationType type = current_frame->pop_stack(

     VerificationType::reference_check(), CHECK_VERIFY(this));

   if (type == VerificationType::uninitialized_this_type()) {

     // The method must be an <init> method of either this class, or one of its

     // superclasses

     klassOop oop = current_class()();

     Klass* klass = oop->klass_part();

     while (klass != NULL && ref_class_type.name() != klass->name()) {

       klass = klass->super()->klass_part();

     }

     if (klass == NULL) {

       verify_error(bci, "Bad <init> method call");

       return;

     }

     current_frame->initialize_object(type, current_type());

     *this_uninit = true;

   } else if (type.is_uninitialized()) {

     u2 new_offset = type.bci();

     address new_bcp = bcs->bcp() - bci + new_offset;

     if (new_offset > (code_length - 3) || (*new_bcp) != Bytecodes::_new) {

       verify_error(new_offset, "Expecting new instruction");

       return;

     }

     u2 new_class_index = Bytes::get_Java_u2(new_bcp + 1);

     verify_cp_class_type(new_class_index, cp, CHECK_VERIFY(this));

     // The method must be an <init> method of the indicated class

     VerificationType new_class_type = cp_index_to_type(

       new_class_index, cp, CHECK_VERIFY(this));

     if (!new_class_type.equals(ref_class_type)) {

       verify_error(bci, "Call to wrong <init> method");

       return;

     }

     // According to the VM spec, if the referent class is a superclass of the

     // current class, and is in a different runtime package, and the method is

     // protected, then the objectref must be the current class or a subclass

     // of the current class.

     VerificationType objectref_type = new_class_type;

     if (name_in_supers(ref_class_type.name(), current_class())) {

       klassOop ref_klass = load_class(

         ref_class_type.name(), CHECK_VERIFY(this));

       methodOop m = instanceKlass::cast(ref_klass)->uncached_lookup_method(

         vmSymbols::object_initializer_name(),

         cp->signature_ref_at(bcs->get_index_big()));

       instanceKlassHandle mh(THREAD, m->method_holder());

       if (m->is_protected() && !mh->is_same_class_package(_klass())) {

         bool assignable = current_type().is_assignable_from(

           objectref_type, current_class(), CHECK_VERIFY(this));

         if (!assignable) {

           verify_error(bci, "Bad access to protected <init> method");

           return;

         }

       }

     }

     current_frame->initialize_object(type, new_class_type);

   } else {

     verify_error(bci, "Bad operand type when invoking <init>");

     return;

   }

 }

 void ClassVerifier::verify_invoke_instructions(

     RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,

     bool *this_uninit, VerificationType return_type,

     constantPoolHandle cp, TRAPS) {

   // Make sure the constant pool item is the right type

   u2 index = bcs->get_index_big();

   Bytecodes::Code opcode = bcs->code();

   unsigned int types = (opcode == Bytecodes::_invokeinterface

                                 ? 1 << JVM_CONSTANT_InterfaceMethodref

                       : opcode == Bytecodes::_invokedynamic

                                 ? 1 << JVM_CONSTANT_NameAndType

                                 : 1 << JVM_CONSTANT_Methodref);

   verify_cp_type(index, cp, types, CHECK_VERIFY(this));

   // Get method name and signature

   symbolHandle method_name(THREAD, cp->name_ref_at(index));

   symbolHandle method_sig(THREAD, cp->signature_ref_at(index));

   if (!SignatureVerifier::is_valid_method_signature(method_sig)) {

     class_format_error(

       "Invalid method signature in class %s referenced "

       "from constant pool index %d", _klass->external_name(), index);

     return;

   }

   // Get referenced class type

   VerificationType ref_class_type;

   if (opcode == Bytecodes::_invokedynamic) {

     if (!EnableInvokeDynamic) {

       class_format_error(

         "invokedynamic instructions not enabled on this JVM",

         _klass->external_name());

       return;

     }

   } else {

     ref_class_type = cp_ref_index_to_type(index, cp, CHECK_VERIFY(this));

   }

   // For a small signature length, we just allocate 128 bytes instead

   // of parsing the signature once to find its size.

   // -3 is for '(', ')' and return descriptor; multiply by 2 is for

   // longs/doubles to be consertive.

   assert(sizeof(VerificationType) == sizeof(uintptr_t),

         "buffer type must match VerificationType size");

   uintptr_t on_stack_sig_types_buffer[128];

   // If we make a VerificationType[128] array directly, the compiler calls

   // to the c-runtime library to do the allocation instead of just

   // stack allocating it.  Plus it would run constructors.  This shows up

   // in performance profiles.

   VerificationType* sig_types;

   int size = (method_sig->utf8_length() - 3) * 2;

   if (size > 128) {

     // Long and double occupies two slots here.

     ArgumentSizeComputer size_it(method_sig);

     size = size_it.size();

     sig_types = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, size);

   } else{

     sig_types = (VerificationType*)on_stack_sig_types_buffer;

   }

   SignatureStream sig_stream(method_sig);

   int sig_i = 0;

   while (!sig_stream.at_return_type()) {

     sig_i += change_sig_to_verificationType(

       &sig_stream, &sig_types[sig_i], CHECK_VERIFY(this));

     sig_stream.next();

   }

   int nargs = sig_i;

 #ifdef ASSERT

   {

     ArgumentSizeComputer size_it(method_sig);

     assert(nargs == size_it.size(), "Argument sizes do not match");

     assert(nargs <= (method_sig->utf8_length() - 3) * 2, "estimate of max size isn't conservative enough");

   }

 #endif

   // Check instruction operands

   u2 bci = bcs->bci();

   if (opcode == Bytecodes::_invokeinterface) {

     address bcp = bcs->bcp();

     // 4905268: count operand in invokeinterface should be nargs+1, not nargs.

     // JSR202 spec: The count operand of an invokeinterface instruction is valid if it is

     // the difference between the size of the operand stack before and after the instruction

     // executes.

     if (*(bcp+3) != (nargs+1)) {

       verify_error(bci, "Inconsistent args count operand in invokeinterface");

       return;

     }

     if (*(bcp+4) != 0) {

       verify_error(bci, "Fourth operand byte of invokeinterface must be zero");

       return;

     }

   }

   if (opcode == Bytecodes::_invokedynamic) {

     address bcp = bcs->bcp();

     if (*(bcp+3) != 0 || *(bcp+4) != 0) {

       verify_error(bci, "Third and fourth operand bytes of invokedynamic must be zero");

       return;

     }

   }

   if (method_name->byte_at(0) == '<') {

     // Make sure <init> can only be invoked by invokespecial

     if (opcode != Bytecodes::_invokespecial ||

         method_name() != vmSymbols::object_initializer_name()) {

       verify_error(bci, "Illegal call to internal method");

       return;

     }

   } else if (opcode == Bytecodes::_invokespecial

              && !ref_class_type.equals(current_type())

              && !ref_class_type.equals(VerificationType::reference_type(

                   current_class()->super()->klass_part()->name()))) {

     bool subtype = ref_class_type.is_assignable_from(

       current_type(), current_class(), CHECK_VERIFY(this));

     if (!subtype) {

       verify_error(bci, "Bad invokespecial instruction: "

           "current class isn't assignable to reference class.");

        return;

     }

   }

   // Match method descriptor with operand stack

   for (int i = nargs - 1; i >= 0; i--) {  // Run backwards

     current_frame->pop_stack(sig_types[i], CHECK_VERIFY(this));

   }

   // Check objectref on operand stack

   if (opcode != Bytecodes::_invokestatic &&

       opcode != Bytecodes::_invokedynamic) {

     if (method_name() == vmSymbols::object_initializer_name()) {  // <init> method

       verify_invoke_init(bcs, ref_class_type, current_frame,

         code_length, this_uninit, cp, CHECK_VERIFY(this));

     } else {   // other methods

       // Ensures that target class is assignable to method class.

       if (opcode == Bytecodes::_invokespecial) {

         current_frame->pop_stack(current_type(), CHECK_VERIFY(this));

       } else if (opcode == Bytecodes::_invokevirtual) {

         VerificationType stack_object_type =

           current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));

         if (current_type() != stack_object_type) {

           assert(cp->cache() == NULL, "not rewritten yet");

           symbolHandle ref_class_name = symbolHandle(THREAD,

             cp->klass_name_at(cp->klass_ref_index_at(index)));

           // See the comments in verify_field_instructions() for

           // the rationale behind this.

           if (name_in_supers(ref_class_name(), current_class())) {

             klassOop ref_class = load_class(ref_class_name, CHECK);

             if (is_protected_access(

                   _klass, ref_class, method_name(), method_sig(), true)) {

               // It's protected access, check if stack object is

               // assignable to current class.

               bool is_assignable = current_type().is_assignable_from(

                 stack_object_type, current_class(), CHECK_VERIFY(this));

               if (!is_assignable) {

                 if (ref_class_type.name() == vmSymbols::java_lang_Object()

                     && stack_object_type.is_array()

                     && method_name() == vmSymbols::clone_name()) {

                   // Special case: arrays pretend to implement public Object

                   // clone().

                 } else {

                   verify_error(bci,

                     "Bad access to protected data in invokevirtual");

                   return;

                 }

               }

             }

           }

         }

       } else {

         assert(opcode == Bytecodes::_invokeinterface, "Unexpected opcode encountered");

         current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));

       }

     }

   }

   // Push the result type.

   if (sig_stream.type() != T_VOID) {

     if (method_name() == vmSymbols::object_initializer_name()) {

       // <init> method must have a void return type

       verify_error(bci, "Return type must be void in <init> method");

       return;

     }

     VerificationType return_type[2];

     int n = change_sig_to_verificationType(

       &sig_stream, return_type, CHECK_VERIFY(this));

     for (int i = 0; i < n; i++) {

       current_frame->push_stack(return_type[i], CHECK_VERIFY(this)); // push types backwards

     }

   }

 }

 VerificationType ClassVerifier::get_newarray_type(

     u2 index, u2 bci, TRAPS) {

   const char* from_bt[] = {

     NULL, NULL, NULL, NULL, "[Z", "[C", "[F", "[D", "[B", "[S", "[I", "[J",

   };

   if (index < T_BOOLEAN || index > T_LONG) {

     verify_error(bci, "Illegal newarray instruction");

     return VerificationType::bogus_type();

   }

   // from_bt[index] contains the array signature which has a length of 2

   symbolHandle sig = oopFactory::new_symbol_handle(

     from_bt[index], 2, CHECK_(VerificationType::bogus_type()));

   return VerificationType::reference_type(sig);

 }

 void ClassVerifier::verify_anewarray(

     u2 index, constantPoolHandle cp, StackMapFrame* current_frame, TRAPS) {

   verify_cp_class_type(index, cp, CHECK_VERIFY(this));

   current_frame->pop_stack(

     VerificationType::integer_type(), CHECK_VERIFY(this));

   VerificationType component_type =

     cp_index_to_type(index, cp, CHECK_VERIFY(this));

   ResourceMark rm(THREAD);

   int length;

   char* arr_sig_str;

   if (component_type.is_array()) {     // it's an array

     const char* component_name = component_type.name()->as_utf8();

     // add one dimension to component

     length = (int)strlen(component_name) + 1;

     arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);

     arr_sig_str[0] = '[';

     strncpy(&arr_sig_str[1], component_name, length - 1);

   } else {         // it's an object or interface

     const char* component_name = component_type.name()->as_utf8();

     // add one dimension to component with 'L' prepended and ';' postpended.

     length = (int)strlen(component_name) + 3;

     arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);

     arr_sig_str[0] = '[';

     arr_sig_str[1] = 'L';

     strncpy(&arr_sig_str[2], component_name, length - 2);

     arr_sig_str[length - 1] = ';';

   }

   symbolHandle arr_sig = oopFactory::new_symbol_handle(

     arr_sig_str, length, CHECK_VERIFY(this));

   VerificationType new_array_type = VerificationType::reference_type(arr_sig);

   current_frame->push_stack(new_array_type, CHECK_VERIFY(this));

 }

 void ClassVerifier::verify_iload(u2 index, StackMapFrame* current_frame, TRAPS) {

   current_frame->get_local(

     index, VerificationType::integer_type(), CHECK_VERIFY(this));

   current_frame->push_stack(

     VerificationType::integer_type(), CHECK_VERIFY(this));

 }

 void ClassVerifier::verify_lload(u2 index, StackMapFrame* current_frame, TRAPS) {

   current_frame->get_local_2(

     index, VerificationType::long_type(),

     VerificationType::long2_type(), CHECK_VERIFY(this));

   current_frame->push_stack_2(

     VerificationType::long_type(),

     VerificationType::long2_type(), CHECK_VERIFY(this));

 }

 void ClassVerifier::verify_fload(u2 index, StackMapFrame* current_frame, TRAPS) {

   current_frame->get_local(

     index, VerificationType::float_type(), CHECK_VERIFY(this));

   current_frame->push_stack(

     VerificationType::float_type(), CHECK_VERIFY(this));

 }

 void ClassVerifier::verify_dload(u2 index, StackMapFrame* current_frame, TRAPS) {

   current_frame->get_local_2(

     index, VerificationType::double_type(),

     VerificationType::double2_type(), CHECK_VERIFY(this));

   current_frame->push_stack_2(

     VerificationType::double_type(),

     VerificationType::double2_type(), CHECK_VERIFY(this));

 }

 void ClassVerifier::verify_aload(u2 index, StackMapFrame* current_frame, TRAPS) {

   VerificationType type = current_frame->get_local(

     index, VerificationType::reference_check(), CHECK_VERIFY(this));

   current_frame->push_stack(type, CHECK_VERIFY(this));

 }

 void ClassVerifier::verify_istore(u2 index, StackMapFrame* current_frame, TRAPS) {

   current_frame->pop_stack(

     VerificationType::integer_type(), CHECK_VERIFY(this));

   current_frame->set_local(

     index, VerificationType::integer_type(), CHECK_VERIFY(this));

 }

 void ClassVerifier::verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS) {

   current_frame->pop_stack_2(

     VerificationType::long2_type(),

     VerificationType::long_type(), CHECK_VERIFY(this));

   current_frame->set_local_2(

     index, VerificationType::long_type(),

     VerificationType::long2_type(), CHECK_VERIFY(this));

 }

 void ClassVerifier::verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS) {

   current_frame->pop_stack(VerificationType::float_type(), CHECK_VERIFY(this));

   current_frame->set_local(

     index, VerificationType::float_type(), CHECK_VERIFY(this));

 }

 void ClassVerifier::verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS) {

   current_frame->pop_stack_2(

     VerificationType::double2_type(),

     VerificationType::double_type(), CHECK_VERIFY(this));

   current_frame->set_local_2(

     index, VerificationType::double_type(),

     VerificationType::double2_type(), CHECK_VERIFY(this));

 }

 void ClassVerifier::verify_astore(u2 index, StackMapFrame* current_frame, TRAPS) {

   VerificationType type = current_frame->pop_stack(

     VerificationType::reference_check(), CHECK_VERIFY(this));

   current_frame->set_local(index, type, CHECK_VERIFY(this));

 }

 void ClassVerifier::verify_iinc(u2 index, StackMapFrame* current_frame, TRAPS) {

   VerificationType type = current_frame->get_local(

     index, VerificationType::integer_type(), CHECK_VERIFY(this));

   current_frame->set_local(index, type, CHECK_VERIFY(this));

 }

 void ClassVerifier::verify_return_value(

     VerificationType return_type, VerificationType type, u2 bci, TRAPS) {

   if (return_type == VerificationType::bogus_type()) {

     verify_error(bci, "Method expects a return value");

     return;

   }

   bool match = return_type.is_assignable_from(type, _klass, CHECK_VERIFY(this));

   if (!match) {

     verify_error(bci, "Bad return type");

     return;

   }

 }