Enable code flushing even when objects were marked incrementally,

since the incremental visitor is setting the gc_age fields correctly.
This means the ResetSharedFunctionInfoCountersDuringIncrementalMarking
test passes even if it hits a marking stack overflow.
Review URL: https://chromiumcodereview.appspot.com/10258001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11481 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mark-compact.cc

@@ -1397,6 +1397,12 @@ class StaticMarkingVisitor : public StaticVisitorBase {
 
   static void VisitSharedFunctionInfoAndFlushCode(Map* map,
                                                   HeapObject* object) {
+    Heap* heap = map->GetHeap();
+    SharedFunctionInfo* shared = reinterpret_cast<SharedFunctionInfo*>(object);
+    if (shared->ic_age() != heap->global_ic_age()) {
+      shared->ResetForNewContext(heap->global_ic_age());
+    }
+
     MarkCompactCollector* collector = map->GetHeap()->mark_compact_collector();
     if (!collector->is_code_flushing_enabled()) {
       VisitSharedFunctionInfoGeneric(map, object);
@@ -1413,10 +1419,6 @@ class StaticMarkingVisitor : public StaticVisitorBase {
 
     if (shared->IsInobjectSlackTrackingInProgress()) shared->DetachInitialMap();
 
-    if (shared->ic_age() != heap->global_ic_age()) {
-      shared->ResetForNewContext(heap->global_ic_age());
-    }
-
     if (!known_flush_code_candidate) {
       known_flush_code_candidate = IsFlushable(heap, shared);
       if (known_flush_code_candidate) {
@@ -1975,6 +1977,7 @@ static inline int MarkWordToObjectStarts(uint32_t mark_bits, int* starts);
 
 
 static void DiscoverGreyObjectsOnPage(MarkingDeque* marking_deque, Page* p) {
+  ASSERT(!marking_deque->IsFull());
   ASSERT(strcmp(Marking::kWhiteBitPattern, "00") == 0);
   ASSERT(strcmp(Marking::kBlackBitPattern, "10") == 0);
   ASSERT(strcmp(Marking::kGreyBitPattern, "11") == 0);

test/cctest/test-heap.cc

@@ -1214,7 +1214,9 @@ TEST(TestSizeOfObjects) {
   // The heap size should go back to initial size after a full GC, even
   // though sweeping didn't finish yet.
   HEAP->CollectAllGarbage(Heap::kNoGCFlags);
-  CHECK(!HEAP->old_pointer_space()->IsSweepingComplete());
+
+  // Normally sweeping would not be complete here, but no guarantees.
+
   CHECK_EQ(initial_size, static_cast<int>(HEAP->SizeOfObjects()));
 
   // Advancing the sweeper step-wise should not change the heap size.
@@ -1649,6 +1651,15 @@ TEST(ResetSharedFunctionInfoCountersDuringIncrementalMarking) {
   while (!marking->IsStopped() && !marking->IsComplete()) {
     marking->Step(1 * MB, IncrementalMarking::NO_GC_VIA_STACK_GUARD);
   }
+  if (!marking->IsStopped() || marking->should_hurry()) {
+    // We don't normally finish a GC via Step(), we normally finish by
+    // setting the stack guard and then do the final steps in the stack
+    // guard interrupt.  But here we didn't ask for that, and there is no
+    // JS code running to trigger the interrupt, so we explicitly finalize
+    // here.
+    HEAP->CollectAllGarbage(Heap::kNoGCFlags,
+                            "Test finalizing incremental mark-sweep");
+  }
 
   CHECK_EQ(HEAP->global_ic_age(), f->shared()->ic_age());
   CHECK_EQ(0, f->shared()->opt_count());