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/*
* Copyright (C) 2007-2021 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. ``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
* 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 "GCController.h"
#include "CommonVM.h"
#include "JSHTMLDocument.h"
#include "Location.h"
#include "WorkerGlobalScope.h"
#include <JavaScriptCore/Heap.h>
#include <JavaScriptCore/HeapSnapshotBuilder.h>
#include <JavaScriptCore/JSLock.h>
#include <JavaScriptCore/VM.h>
#include <pal/Logging.h>
#include <wtf/FileSystem.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/StdLibExtras.h>
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
using namespace JSC;
static void collect()
{
JSLockHolder lock(commonVM());
commonVM().heap.collectNow(Async, CollectionScope::Full);
}
WTF_MAKE_TZONE_ALLOCATED_IMPL(GCController);
GCController& GCController::singleton()
{
static NeverDestroyed<GCController> controller;
return controller;
}
GCController::GCController()
: m_GCTimer(*this, &GCController::gcTimerFired)
{
static std::once_flag onceFlag;
std::call_once(onceFlag, [] {
PAL::registerNotifyCallback("com.apple.WebKit.dumpGCHeap"_s, [] {
GCController::singleton().dumpHeap();
});
});
}
void GCController::garbageCollectSoon()
{
// We only use reportAbandonedObjectGraph for systems for which there's an implementation
// of the garbage collector timers in JavaScriptCore. We wouldn't need this if JavaScriptCore
// used a timer implementation from WTF like RunLoop::Timer.
#if USE(CF) || USE(GLIB)
JSLockHolder lock(commonVM());
commonVM().heap.reportAbandonedObjectGraph();
#else
garbageCollectNow();
#endif
}
void GCController::garbageCollectOnNextRunLoop()
{
if (!m_GCTimer.isActive())
m_GCTimer.startOneShot(0_s);
}
void GCController::gcTimerFired()
{
collect();
}
void GCController::garbageCollectNow()
{
JSLockHolder lock(commonVM());
if (!commonVM().heap.currentThreadIsDoingGCWork()) {
commonVM().heap.collectNow(Sync, CollectionScope::Full);
WTF::releaseFastMallocFreeMemory();
}
}
void GCController::garbageCollectNowIfNotDoneRecently()
{
#if USE(CF) || USE(GLIB)
JSLockHolder lock(commonVM());
if (!commonVM().heap.currentThreadIsDoingGCWork())
commonVM().heap.collectNowFullIfNotDoneRecently(Async);
#else
garbageCollectNow();
#endif
}
void GCController::garbageCollectOnAlternateThreadForDebugging(bool waitUntilDone)
{
auto thread = Thread::create("WebCore: GCController"_s, &collect, ThreadType::GarbageCollection);
if (waitUntilDone) {
thread->waitForCompletion();
return;
}
thread->detach();
}
void GCController::setJavaScriptGarbageCollectorTimerEnabled(bool enable)
{
commonVM().heap.setGarbageCollectionTimerEnabled(enable);
}
void GCController::deleteAllCode(DeleteAllCodeEffort effort)
{
JSLockHolder lock(commonVM());
commonVM().deleteAllCode(effort);
}
void GCController::deleteAllLinkedCode(DeleteAllCodeEffort effort)
{
JSLockHolder lock(commonVM());
commonVM().deleteAllLinkedCode(effort);
}
void GCController::dumpHeapForVM(VM& vm)
{
auto [tempFilePath, fileHandle] = FileSystem::openTemporaryFile("GCHeap"_s);
if (!FileSystem::isHandleValid(fileHandle)) {
WTFLogAlways("Dumping GC heap failed to open temporary file");
return;
}
JSLockHolder lock(vm);
sanitizeStackForVM(vm);
String jsonData;
{
DeferGCForAWhile deferGC(vm); // Prevent concurrent GC from interfering with the full GC that the snapshot does.
HeapSnapshotBuilder snapshotBuilder(vm.ensureHeapProfiler(), HeapSnapshotBuilder::SnapshotType::GCDebuggingSnapshot);
snapshotBuilder.buildSnapshot();
jsonData = snapshotBuilder.json();
}
CString utf8String = jsonData.utf8();
FileSystem::writeToFile(fileHandle, byteCast<uint8_t>(utf8String.span()));
FileSystem::closeFile(fileHandle);
WTFLogAlways("Dumped GC heap to %s%s", tempFilePath.utf8().data(), isMainThread() ? "" : " for Worker");
}
void GCController::dumpHeap()
{
dumpHeapForVM(commonVM());
WorkerGlobalScope::dumpGCHeapForWorkers();
}
} // namespace WebCore
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