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/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "classfile/classFileParser.hpp"
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#include "classfile/classFileStream.hpp"
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#include "classfile/classLoaderData.hpp"
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#include "classfile/klassFactory.hpp"
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#include "memory/resourceArea.hpp"
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#include "prims/jvmtiEnvBase.hpp"
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static ClassFileStream* prologue(ClassFileStream* stream,
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Symbol* name,
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ClassLoaderData* loader_data,
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Handle protection_domain,
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JvmtiCachedClassFileData** cached_class_file,
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TRAPS) {
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assert(stream != NULL, "invariant");
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if (JvmtiExport::should_post_class_file_load_hook()) {
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assert(THREAD->is_Java_thread(), "must be a JavaThread");
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const JavaThread* jt = (JavaThread*)THREAD;
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Handle class_loader(THREAD, loader_data->class_loader());
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// Get the cached class file bytes (if any) from the class that
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// is being redefined or retransformed. We use jvmti_thread_state()
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// instead of JvmtiThreadState::state_for(jt) so we don't allocate
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// a JvmtiThreadState any earlier than necessary. This will help
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// avoid the bug described by 7126851.
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JvmtiThreadState* state = jt->jvmti_thread_state();
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if (state != NULL) {
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KlassHandle* h_class_being_redefined =
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state->get_class_being_redefined();
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if (h_class_being_redefined != NULL) {
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instanceKlassHandle ikh_class_being_redefined =
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instanceKlassHandle(THREAD, (*h_class_being_redefined)());
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*cached_class_file = ikh_class_being_redefined->get_cached_class_file();
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}
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}
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unsigned char* ptr = const_cast<unsigned char*>(stream->buffer());
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unsigned char* end_ptr = ptr + stream->length();
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JvmtiExport::post_class_file_load_hook(name,
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class_loader,
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protection_domain,
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&ptr,
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&end_ptr,
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cached_class_file);
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if (ptr != stream->buffer()) {
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// JVMTI agent has modified class file data.
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// Set new class file stream using JVMTI agent modified class file data.
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stream = new ClassFileStream(ptr,
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end_ptr - ptr,
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stream->source(),
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stream->need_verify());
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}
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}
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return stream;
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}
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instanceKlassHandle KlassFactory::create_from_stream(ClassFileStream* stream,
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Symbol* name,
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ClassLoaderData* loader_data,
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Handle protection_domain,
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const Klass* host_klass,
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GrowableArray<Handle>* cp_patches,
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TempNewSymbol* parsed_name,
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TRAPS) {
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assert(stream != NULL, "invariant");
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assert(loader_data != NULL, "invariant");
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assert(THREAD->is_Java_thread(), "must be a JavaThread");
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ResourceMark rm;
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HandleMark hm;
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JvmtiCachedClassFileData* cached_class_file = NULL;
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stream = prologue(stream,
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name,
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loader_data,
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protection_domain,
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&cached_class_file,
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CHECK_NULL);
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ClassFileParser parser(stream,
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name,
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loader_data,
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protection_domain,
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parsed_name,
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host_klass,
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cp_patches,
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ClassFileParser::BROADCAST, // publicity level
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CHECK_NULL);
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instanceKlassHandle result = parser.create_instance_klass(CHECK_NULL);
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assert(result == parser.create_instance_klass(THREAD), "invariant");
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if (result.is_null()) {
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return NULL;
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}
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if (cached_class_file != NULL) {
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// JVMTI: we have an InstanceKlass now, tell it about the cached bytes
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result->set_cached_class_file(cached_class_file);
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}
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return result;
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}
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