| /* |
| * Copyright (C) 2011 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "HandleSet.h" |
| |
| #include "HeapRootVisitor.h" |
| #include "JSObject.h" |
| |
| #if COMPILER(GHS) |
| #include "JSDestructibleObject.h" |
| #endif |
| |
| namespace JSC { |
| |
| HandleSet::HandleSet(JSGlobalData* globalData) |
| : m_globalData(globalData) |
| , m_nextToFinalize(0) |
| { |
| grow(); |
| } |
| |
| void HandleSet::grow() |
| { |
| Node* block = m_blockStack.grow(); |
| for (int i = m_blockStack.blockLength - 1; i >= 0; --i) { |
| Node* node = &block[i]; |
| new (NotNull, node) Node(this); |
| m_freeList.push(node); |
| } |
| } |
| |
| void HandleSet::visitStrongHandles(HeapRootVisitor& heapRootVisitor) |
| { |
| Node* end = m_strongList.end(); |
| for (Node* node = m_strongList.begin(); node != end; node = node->next()) { |
| #if ENABLE(GC_VALIDATION) |
| if (!isLiveNode(node)) |
| CRASH(); |
| #endif |
| heapRootVisitor.visit(node->slot()); |
| } |
| } |
| |
| void HandleSet::writeBarrier(HandleSlot slot, const JSValue& value) |
| { |
| // Forbid assignment to handles during the finalization phase, since it would violate many GC invariants. |
| // File a bug with stack trace if you hit this. |
| if (m_nextToFinalize) |
| CRASH(); |
| |
| if (!value == !*slot && slot->isCell() == value.isCell()) |
| return; |
| |
| Node* node = toNode(slot); |
| #if ENABLE(GC_VALIDATION) |
| if (!isLiveNode(node)) |
| CRASH(); |
| #endif |
| SentinelLinkedList<Node>::remove(node); |
| if (!value || !value.isCell()) { |
| m_immediateList.push(node); |
| return; |
| } |
| |
| m_strongList.push(node); |
| #if ENABLE(GC_VALIDATION) |
| if (!isLiveNode(node)) |
| CRASH(); |
| #endif |
| } |
| |
| unsigned HandleSet::protectedGlobalObjectCount() |
| { |
| unsigned count = 0; |
| Node* end = m_strongList.end(); |
| for (Node* node = m_strongList.begin(); node != end; node = node->next()) { |
| JSValue value = *node->slot(); |
| if (value.isObject() && asObject(value.asCell())->isGlobalObject()) |
| count++; |
| } |
| return count; |
| } |
| |
| #if ENABLE(GC_VALIDATION) || !ASSERT_DISABLED |
| bool HandleSet::isLiveNode(Node* node) |
| { |
| if (node->prev()->next() != node) |
| return false; |
| if (node->next()->prev() != node) |
| return false; |
| |
| return true; |
| } |
| #endif |
| |
| } // namespace JSC |