Mercurial > hg > graal-compiler
view src/share/vm/classfile/metadataOnStackMark.cpp @ 22300:7b4a47fcc4c0
Move most of jdk.internal.jvmci.debug back into com.oracle.graal.debug
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
---|---|
date | Wed, 22 Jul 2015 23:27:39 -0700 |
parents | b12a2a9b05ca |
children |
line wrap: on
line source
/* * Copyright (c) 2013, 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 "precompiled.hpp" #include "classfile/metadataOnStackMark.hpp" #include "code/codeCache.hpp" #include "compiler/compileBroker.hpp" #include "oops/metadata.hpp" #include "prims/jvmtiImpl.hpp" #include "runtime/synchronizer.hpp" #include "runtime/thread.hpp" #include "services/threadService.hpp" #include "utilities/chunkedList.hpp" volatile MetadataOnStackBuffer* MetadataOnStackMark::_used_buffers = NULL; volatile MetadataOnStackBuffer* MetadataOnStackMark::_free_buffers = NULL; NOT_PRODUCT(bool MetadataOnStackMark::_is_active = false;) // Walk metadata on the stack and mark it so that redefinition doesn't delete // it. Class unloading also walks the previous versions and might try to // delete it, so this class is used by class unloading also. MetadataOnStackMark::MetadataOnStackMark(bool visit_code_cache) { assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); assert(_used_buffers == NULL, "sanity check"); NOT_PRODUCT(_is_active = true;) Threads::metadata_do(Metadata::mark_on_stack); if (visit_code_cache) { CodeCache::alive_nmethods_do(nmethod::mark_on_stack); } CompileBroker::mark_on_stack(); JvmtiCurrentBreakpoints::metadata_do(Metadata::mark_on_stack); ThreadService::metadata_do(Metadata::mark_on_stack); } MetadataOnStackMark::~MetadataOnStackMark() { assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); // Unmark everything that was marked. Can't do the same walk because // redefine classes messes up the code cache so the set of methods // might not be the same. retire_buffer_for_thread(Thread::current()); MetadataOnStackBuffer* buffer = const_cast<MetadataOnStackBuffer* >(_used_buffers); while (buffer != NULL) { // Clear on stack state for all metadata. size_t size = buffer->size(); for (size_t i = 0; i < size; i++) { Metadata* md = buffer->at(i); md->set_on_stack(false); } MetadataOnStackBuffer* next = buffer->next_used(); // Move the buffer to the free list. buffer->clear(); buffer->set_next_used(NULL); buffer->set_next_free(const_cast<MetadataOnStackBuffer*>(_free_buffers)); _free_buffers = buffer; // Step to next used buffer. buffer = next; } _used_buffers = NULL; NOT_PRODUCT(_is_active = false;) } void MetadataOnStackMark::retire_buffer(MetadataOnStackBuffer* buffer) { if (buffer == NULL) { return; } MetadataOnStackBuffer* old_head; do { old_head = const_cast<MetadataOnStackBuffer*>(_used_buffers); buffer->set_next_used(old_head); } while (Atomic::cmpxchg_ptr(buffer, &_used_buffers, old_head) != old_head); } void MetadataOnStackMark::retire_buffer_for_thread(Thread* thread) { retire_buffer(thread->metadata_on_stack_buffer()); thread->set_metadata_on_stack_buffer(NULL); } bool MetadataOnStackMark::has_buffer_for_thread(Thread* thread) { return thread->metadata_on_stack_buffer() != NULL; } MetadataOnStackBuffer* MetadataOnStackMark::allocate_buffer() { MetadataOnStackBuffer* allocated; MetadataOnStackBuffer* new_head; do { allocated = const_cast<MetadataOnStackBuffer*>(_free_buffers); if (allocated == NULL) { break; } new_head = allocated->next_free(); } while (Atomic::cmpxchg_ptr(new_head, &_free_buffers, allocated) != allocated); if (allocated == NULL) { allocated = new MetadataOnStackBuffer(); } assert(!allocated->is_full(), err_msg("Should not be full: " PTR_FORMAT, p2i(allocated))); return allocated; } // Record which objects are marked so we can unmark the same objects. void MetadataOnStackMark::record(Metadata* m, Thread* thread) { assert(_is_active, "metadata on stack marking is active"); MetadataOnStackBuffer* buffer = thread->metadata_on_stack_buffer(); if (buffer != NULL && buffer->is_full()) { retire_buffer(buffer); buffer = NULL; } if (buffer == NULL) { buffer = allocate_buffer(); thread->set_metadata_on_stack_buffer(buffer); } buffer->push(m); }