Bug 758034 - Add new JS APIs for GC (r=terrence)

js/src/jsfriendapi.cpp

@@ -114,6 +114,18 @@ js::PrepareForFullGC(JSRuntime *rt)
         c->scheduleGC();
 }
 
+JS_FRIEND_API(void)
+js::PrepareForIncrementalGC(JSRuntime *rt)
+{
+    if (rt->gcIncrementalState == gc::NO_INCREMENTAL)
+        return;
+
+    for (CompartmentsIter c(rt); !c.done(); c.next()) {
+        if (c->needsBarrier())
+            PrepareCompartmentForGC(c);
+    }
+}
+
 JS_FRIEND_API(bool)
 js::IsGCScheduled(JSRuntime *rt)
 {
@@ -149,6 +161,12 @@ js::IncrementalGC(JSRuntime *rt, gcreason::Reason reason)
     GCSlice(rt, GC_NORMAL, reason);
 }
 
+JS_FRIEND_API(void)
+js::FinishIncrementalGC(JSRuntime *rt, gcreason::Reason reason)
+{
+    GCFinalSlice(rt, GC_NORMAL, reason);
+}
+
 JS_FRIEND_API(void)
 JS_ShrinkGCBuffers(JSRuntime *rt)
 {
@@ -758,10 +776,7 @@ NotifyDidPaint(JSRuntime *rt)
     }
 
     if (rt->gcIncrementalState != gc::NO_INCREMENTAL && !rt->gcInterFrameGC) {
-        for (CompartmentsIter c(rt); !c.done(); c.next()) {
-            if (c->needsBarrier())
-                PrepareCompartmentForGC(c);
-        }
+        PrepareForIncrementalGC(rt);
         GCSlice(rt, GC_NORMAL, gcreason::REFRESH_FRAME);
     }
 

js/src/jsfriendapi.h

@@ -632,6 +632,9 @@ PrepareCompartmentForGC(JSCompartment *comp);
 extern JS_FRIEND_API(void)
 PrepareForFullGC(JSRuntime *rt);
 
+extern JS_FRIEND_API(void)
+PrepareForIncrementalGC(JSRuntime *rt);
+
 extern JS_FRIEND_API(bool)
 IsGCScheduled(JSRuntime *rt);
 
@@ -655,7 +658,7 @@ extern JS_FRIEND_API(void)
 IncrementalGC(JSRuntime *rt, gcreason::Reason reason);
 
 extern JS_FRIEND_API(void)
-SetGCSliceTimeBudget(JSContext *cx, int64_t millis);
+FinishIncrementalGC(JSRuntime *rt, gcreason::Reason reason);
 
 enum GCProgress {
     /*

js/src/jsgc.cpp

@@ -3914,6 +3914,13 @@ GCSlice(JSRuntime *rt, JSGCInvocationKind gckind, gcreason::Reason reason)
     Collect(rt, true, rt->gcSliceBudget, gckind, reason);
 }
 
+void
+GCFinalSlice(JSRuntime *rt, JSGCInvocationKind gckind, gcreason::Reason reason)
+{
+    Collect(rt, true, SliceBudget::Unlimited, gckind, reason);
+}
+
+
 void
 GCDebugSlice(JSRuntime *rt, bool limit, int64_t objCount)
 {

js/src/jsgc.h

@@ -477,6 +477,9 @@ GC(JSRuntime *rt, JSGCInvocationKind gckind, js::gcreason::Reason reason);
 extern void
 GCSlice(JSRuntime *rt, JSGCInvocationKind gckind, js::gcreason::Reason reason);
 
+extern void
+GCFinalSlice(JSRuntime *rt, JSGCInvocationKind gckind, js::gcreason::Reason reason);
+
 extern void
 GCDebugSlice(JSRuntime *rt, bool limit, int64_t objCount);