Allow incremental marking when expose_gc is turned on.

src/extensions/gc-extension.cc

Index: src/extensions/gc-extension.cc
diff --git a/src/extensions/gc-extension.cc b/src/extensions/gc-extension.cc
index 813b9219bfec7eacd0638cf002c8abb368bba3d2..7323a0d100183ad6e94da8ea30add26791d9ba63 100644
--- a/src/extensions/gc-extension.cc
+++ b/src/extensions/gc-extension.cc
@@ -43,6 +43,8 @@ v8::Handle<v8::Value> GCExtension::GC(const v8::Arguments& args) {
   if (args[0]->BooleanValue()) {
     HEAP->CollectGarbage(NEW_SPACE, "gc extension");
   } else {
+    HEAP->mark_compact_collector()->
+        SetFlags(Heap::kAbortIncrementalMarkingMask);

[Michael Starzinger, 2012/11/22 10:17:02]

You should just pass the GC flag directly in the call. Passing it like this is
basically a NOP, because it will be overridden by the subsequent GC call.

[Hannes Payer (out of office), 2012/11/22 10:21:34]

Done.

     HEAP->CollectAllGarbage(Heap::kNoGCFlags, "gc extension");
   }
   return v8::Undefined();