151 lines
4.7 KiB
C++
151 lines
4.7 KiB
C++
/*
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* Copyright (c) 2013, 2016, 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/metadataOnStackMark.hpp"
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#include "code/codeCache.hpp"
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#include "compiler/compileBroker.hpp"
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#include "oops/metadata.hpp"
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#include "prims/jvmtiImpl.hpp"
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#include "runtime/synchronizer.hpp"
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#include "runtime/thread.hpp"
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#include "services/threadService.hpp"
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#include "utilities/chunkedList.hpp"
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#if INCLUDE_JVMCI
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#include "jvmci/jvmciRuntime.hpp"
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#endif
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MetadataOnStackBuffer* MetadataOnStackMark::_used_buffers = NULL;
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MetadataOnStackBuffer* MetadataOnStackMark::_free_buffers = NULL;
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MetadataOnStackBuffer* MetadataOnStackMark::_current_buffer = NULL;
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NOT_PRODUCT(bool MetadataOnStackMark::_is_active = false;)
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// Walk metadata on the stack and mark it so that redefinition doesn't delete
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// it. Class unloading only deletes in-error class files, methods created by
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// the relocator and dummy constant pools. None of these appear anywhere except
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// in metadata Handles.
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MetadataOnStackMark::MetadataOnStackMark(bool redefinition_walk) {
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assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
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assert(_used_buffers == NULL, "sanity check");
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assert(!_is_active, "MetadataOnStackMarks do not nest");
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NOT_PRODUCT(_is_active = true;)
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Threads::metadata_handles_do(Metadata::mark_on_stack);
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if (redefinition_walk) {
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Threads::metadata_do(Metadata::mark_on_stack);
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CodeCache::metadata_do(Metadata::mark_on_stack);
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CompileBroker::mark_on_stack();
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JvmtiCurrentBreakpoints::metadata_do(Metadata::mark_on_stack);
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ThreadService::metadata_do(Metadata::mark_on_stack);
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#if INCLUDE_JVMCI
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JVMCIRuntime::metadata_do(Metadata::mark_on_stack);
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#endif
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}
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}
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MetadataOnStackMark::~MetadataOnStackMark() {
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assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
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// Unmark everything that was marked. Can't do the same walk because
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// redefine classes messes up the code cache so the set of methods
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// might not be the same.
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retire_current_buffer();
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MetadataOnStackBuffer* buffer = _used_buffers;
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while (buffer != NULL) {
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// Clear on stack state for all metadata.
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size_t size = buffer->size();
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for (size_t i = 0; i < size; i++) {
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Metadata* md = buffer->at(i);
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md->set_on_stack(false);
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}
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MetadataOnStackBuffer* next = buffer->next_used();
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// Move the buffer to the free list.
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buffer->clear();
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buffer->set_next_used(NULL);
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buffer->set_next_free(_free_buffers);
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_free_buffers = buffer;
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// Step to next used buffer.
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buffer = next;
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}
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_used_buffers = NULL;
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NOT_PRODUCT(_is_active = false;)
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}
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void MetadataOnStackMark::retire_buffer(MetadataOnStackBuffer* buffer) {
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if (buffer == NULL) {
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return;
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}
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buffer->set_next_used(_used_buffers);
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_used_buffers = buffer;
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}
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// Current buffer is full or we're ready to walk them, add it to the used list.
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void MetadataOnStackMark::retire_current_buffer() {
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retire_buffer(_current_buffer);
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_current_buffer = NULL;
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}
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// Get buffer off free list.
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MetadataOnStackBuffer* MetadataOnStackMark::allocate_buffer() {
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MetadataOnStackBuffer* allocated = _free_buffers;
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if (allocated != NULL) {
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_free_buffers = allocated->next_free();
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}
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if (allocated == NULL) {
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allocated = new MetadataOnStackBuffer();
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}
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assert(!allocated->is_full(), "Should not be full: " PTR_FORMAT, p2i(allocated));
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return allocated;
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}
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// Record which objects are marked so we can unmark the same objects.
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void MetadataOnStackMark::record(Metadata* m) {
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assert(_is_active, "metadata on stack marking is active");
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MetadataOnStackBuffer* buffer = _current_buffer;
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if (buffer != NULL && buffer->is_full()) {
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retire_buffer(buffer);
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buffer = NULL;
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}
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if (buffer == NULL) {
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buffer = allocate_buffer();
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_current_buffer = buffer;
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}
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buffer->push(m);
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}
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