JavaScriptCore-1218.0.1.tar.gz

[apple/javascriptcore.git] / runtime / GCActivityCallback.cpp

diff --git a/runtime/GCActivityCallback.cpp b/runtime/GCActivityCallback.cpp
index 851ffc22352864a3176b70cd7e9157a011083aa1..08ed0f03483de4ec41d206ea3952552706acbbbd 100644 (file)
--- a/runtime/GCActivityCallback.cpp
+++ b/runtime/GCActivityCallback.cpp
@@ -29,42 +29,180 @@
 #include "config.h"
 #include "GCActivityCallback.h"
 
+#include "APIShims.h"
+#include "Heap.h"
+#include "VM.h"
+#include "JSLock.h"
+#include "JSObject.h"
+
+#include <wtf/RetainPtr.h>
+#include <wtf/WTFThreadData.h>
+
+#if PLATFORM(EFL)
+#include <wtf/MainThread.h>
+#endif
+
 namespace JSC {
 
-struct DefaultGCActivityCallbackPlatformData {
-};
+#if USE(CF) || PLATFORM(QT) || PLATFORM(EFL)
 
-DefaultGCActivityCallback::DefaultGCActivityCallback(Heap*)
+#if PLATFORM(IOS)
+    bool GCActivityCallback::s_shouldCreateGCTimer = true;
+#endif // PLATFORM(IOS)
+
+const double gcTimeSlicePerMB = 0.01; // Percentage of CPU time we will spend to reclaim 1 MB
+const double maxGCTimeSlice = 0.05; // The maximum amount of CPU time we want to use for opportunistic timer-triggered collections.
+const double timerSlop = 2.0; // Fudge factor to avoid performance cost of resetting timer.
+const double pagingTimeOut = 0.1; // Time in seconds to allow opportunistic timer to iterate over all blocks to see if the Heap is paged out.
+const double hour = 60 * 60;
+
+#if USE(CF)
+DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap)
+    : GCActivityCallback(heap->vm(), CFRunLoopGetCurrent())
+    , m_delay(s_decade)
 {
 }
 
-DefaultGCActivityCallback::~DefaultGCActivityCallback()
+DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap, CFRunLoopRef runLoop)
+    : GCActivityCallback(heap->vm(), runLoop)
+    , m_delay(s_decade)
+{
+}
+#elif PLATFORM(QT)
+DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap)
+    : GCActivityCallback(heap->vm())
+    , m_delay(hour)
+{
+}
+#elif PLATFORM(EFL)
+DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap)
+    : GCActivityCallback(heap->vm(), WTF::isMainThread())
+    , m_delay(hour)
 {
 }
+#endif
 
-void DefaultGCActivityCallback::didAllocate(size_t)
+void DefaultGCActivityCallback::doWork()
+{
+    Heap* heap = &m_vm->heap;
+    if (!isEnabled())
+        return;
+    
+    APIEntryShim shim(m_vm);
+#if !PLATFORM(IOS)
+    double startTime = WTF::monotonicallyIncreasingTime();
+    if (heap->isPagedOut(startTime + pagingTimeOut)) {
+        heap->activityCallback()->cancel();
+        heap->increaseLastGCLength(pagingTimeOut);
+        return;
+    }
+#endif
+    heap->collect(Heap::DoNotSweep);
+}
+    
+#if USE(CF)
+void DefaultGCActivityCallback::scheduleTimer(double newDelay)
 {
+    if (newDelay * timerSlop > m_delay)
+        return;
+    double delta = m_delay - newDelay;
+    m_delay = newDelay;
+    CFRunLoopTimerSetNextFireDate(m_timer.get(), CFRunLoopTimerGetNextFireDate(m_timer.get()) - delta);
 }
 
-void DefaultGCActivityCallback::willCollect()
+void DefaultGCActivityCallback::cancelTimer()
+{
+    m_delay = s_decade;
+    CFRunLoopTimerSetNextFireDate(m_timer.get(), CFAbsoluteTimeGetCurrent() + s_decade);
+}
+#elif PLATFORM(QT)
+
+void DefaultGCActivityCallback::scheduleTimer(double newDelay)
 {
+    if (newDelay * timerSlop > m_delay)
+        return;
+    m_delay = newDelay;
+    m_timer.start(newDelay * 1000, this);
 }
 
-void DefaultGCActivityCallback::synchronize()
+void DefaultGCActivityCallback::cancelTimer()
 {
+    m_delay = hour;
+    m_timer.stop();
+}
+#elif PLATFORM(EFL)
+void DefaultGCActivityCallback::scheduleTimer(double newDelay)
+{
+    if (newDelay * timerSlop > m_delay)
+        return;
+
+    stop();
+    m_delay = newDelay;
+    
+    ASSERT(!m_timer);
+    m_timer = add(newDelay, this);
+}
+
+void DefaultGCActivityCallback::cancelTimer()
+{
+    m_delay = hour;
+    stop();
+}
+#endif
+
+void DefaultGCActivityCallback::didAllocate(size_t bytes)
+{
+#if PLATFORM(EFL)
+    if (!isEnabled())
+        return;
+
+    ASSERT(WTF::isMainThread());
+#endif
+
+    // The first byte allocated in an allocation cycle will report 0 bytes to didAllocate. 
+    // We pretend it's one byte so that we don't ignore this allocation entirely.
+    if (!bytes)
+        bytes = 1;
+    Heap* heap = static_cast<Heap*>(&m_vm->heap);
+    double gcTimeSlice = std::min((static_cast<double>(bytes) / MB) * gcTimeSlicePerMB, maxGCTimeSlice);
+    double newDelay = heap->lastGCLength() / gcTimeSlice;
+    scheduleTimer(newDelay);
+}
+
+void DefaultGCActivityCallback::willCollect()
+{
+    cancelTimer();
 }
 
 void DefaultGCActivityCallback::cancel()
+{
+    cancelTimer();
+}
+
+#else
+
+DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap)
+    : GCActivityCallback(heap->vm())
+{
+}
+
+void DefaultGCActivityCallback::doWork()
 {
 }
 
-void DefaultGCActivityCallback::didStartVMShutdown()
+void DefaultGCActivityCallback::didAllocate(size_t)
 {
 }
 
-void DefaultGCActivityCallback::invalidate()
+void DefaultGCActivityCallback::willCollect()
 {
 }
 
+void DefaultGCActivityCallback::cancel()
+{
+}
+
+#endif
+
 }