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/*
* Copyright (C) 2007 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 COMPUTER, 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 COMPUTER, 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 "JSDOMWindow.h"
#include <runtime/VM.h>
#include <runtime/JSLock.h>
#include <heap/Heap.h>
#include <wtf/StdLibExtras.h>
using namespace JSC;
namespace WebCore {
static void collect(void*)
{
JSLockHolder lock(JSDOMWindow::commonVM());
JSDOMWindow::commonVM()->heap.collectAllGarbage();
}
GCController& gcController()
{
DEFINE_STATIC_LOCAL(GCController, staticGCController, ());
return staticGCController;
}
GCController::GCController()
#if !USE(CF)
: m_GCTimer(this, &GCController::gcTimerFired)
#endif
{
}
void GCController::garbageCollectSoon()
{
// We only use reportAbandonedObjectGraph on systems with CoreFoundation
// since it uses a runloop-based timer that is currently only available on
// systems with CoreFoundation. If and when the notion of a run loop is pushed
// down into WTF so that more platforms can take advantage of it, we will be
// able to use reportAbandonedObjectGraph on more platforms.
#if USE(CF)
JSLockHolder lock(JSDOMWindow::commonVM());
JSDOMWindow::commonVM()->heap.reportAbandonedObjectGraph();
#else
if (!m_GCTimer.isActive())
m_GCTimer.startOneShot(0);
#endif
}
#if !USE(CF)
void GCController::gcTimerFired(Timer<GCController>*)
{
collect(0);
}
#endif
void GCController::garbageCollectNow()
{
JSLockHolder lock(JSDOMWindow::commonVM());
#if PLATFORM(IOS)
// If JavaScript was never run in this process, there's no need to call GC which will
// end up creating a VM unnecessarily.
if (!JSDOMWindow::commonVMExists())
return;
#endif
if (!JSDOMWindow::commonVM()->heap.isBusy())
JSDOMWindow::commonVM()->heap.collectAllGarbage();
}
void GCController::garbageCollectOnAlternateThreadForDebugging(bool waitUntilDone)
{
ThreadIdentifier threadID = createThread(collect, 0, "WebCore: GCController");
if (waitUntilDone) {
waitForThreadCompletion(threadID);
return;
}
detachThread(threadID);
}
void GCController::releaseExecutableMemory()
{
JSLockHolder lock(JSDOMWindow::commonVM());
#if PLATFORM(IOS)
// If JavaScript was never run in this process, there's no need to call GC which will
// end up creating a VM unnecessarily.
if (!JSDOMWindow::commonVMExists())
return;
#endif
// We shouldn't have any javascript running on our stack when this function is called. The
// following line asserts that.
ASSERT(!JSDOMWindow::commonVM()->entryScope);
// But be safe in release builds just in case...
if (JSDOMWindow::commonVM()->entryScope)
return;
JSDOMWindow::commonVM()->releaseExecutableMemory();
}
void GCController::setJavaScriptGarbageCollectorTimerEnabled(bool enable)
{
JSDOMWindow::commonVM()->heap.setGarbageCollectionTimerEnabled(enable);
}
void GCController::discardAllCompiledCode()
{
JSLockHolder lock(JSDOMWindow::commonVM());
JSDOMWindow::commonVM()->discardAllCode();
}
} // namespace WebCore
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