[Qt] Implement GCActivityCallback

https://bugs.webkit.org/show_bug.cgi?id=103998

Reviewed by Simon Hausmann.

Source/JavaScriptCore:

Implements the activity triggered garbage collector.

* runtime/GCActivityCallback.cpp:
(JSC::DefaultGCActivityCallback::DefaultGCActivityCallback):
(JSC::DefaultGCActivityCallback::scheduleTimer):
(JSC::DefaultGCActivityCallback::cancelTimer):
* runtime/GCActivityCallback.h:
(GCActivityCallback):
(DefaultGCActivityCallback):

Source/WebCore:

Implements the activity triggered garbage collector,
and disables the timer based fallback.

* bindings/js/GCController.cpp:
(WebCore::GCController::GCController):
(WebCore::GCController::garbageCollectSoon):
* bindings/js/GCController.h:
(GCController):

Change-Id: Idd8f714e71871b3cc991f8d1866cdd271a47eff4
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141114 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>

1 files changed, 27 insertions, 2 deletions

diff --git a/Source/JavaScriptCore/runtime/GCActivityCallback.cpp b/Source/JavaScriptCore/runtime/GCActivityCallback.cpp
index 74cbdbaef..0c07b5e02 100644
--- a/Source/JavaScriptCore/runtime/GCActivityCallback.cpp
+++ b/Source/JavaScriptCore/runtime/GCActivityCallback.cpp
@@ -40,14 +40,15 @@
 
 namespace JSC {
 
-#if USE(CF)
+#if USE(CF) || PLATFORM(QT)
 
 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 CFTimeInterval hour = 60 * 60;
+const double hour = 60 * 60;
 
+#if USE(CF)
 DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap)
     : GCActivityCallback(heap->globalData(), CFRunLoopGetCurrent())
     , m_delay(s_decade)
@@ -59,6 +60,13 @@ DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap, CFRunLoopRef ru
     , m_delay(s_decade)
 {
 }
+#elif PLATFORM(QT)
+DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap)
+    : GCActivityCallback(heap->globalData())
+    , m_delay(hour)
+{
+}
+#endif
 
 void DefaultGCActivityCallback::doWork()
 {
@@ -78,6 +86,7 @@ void DefaultGCActivityCallback::doWork()
     heap->collect(Heap::DoNotSweep);
 }
     
+#if USE(CF)
 void DefaultGCActivityCallback::scheduleTimer(double newDelay)
 {
     if (newDelay * timerSlop > m_delay)
@@ -92,6 +101,22 @@ 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::cancelTimer()
+{
+    m_delay = hour;
+    m_timer.stop();
+}
+#endif
 
 void DefaultGCActivityCallback::didAllocate(size_t bytes)
 {