Remove sequential sweeping mode and perform lazy sweeping when no sweeper threads are active.

test/cctest/test-heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 26 matching lines @@
 #include "src/macro-assembler.h"
 #include "src/stub-cache.h"
 #include "test/cctest/cctest.h"
 
 using namespace v8::internal;
 
 // Go through all incremental marking steps in one swoop.
 static void SimulateIncrementalMarking() {
   MarkCompactCollector* collector = CcTest::heap()->mark_compact_collector();
   IncrementalMarking* marking = CcTest::heap()->incremental_marking();
-  if (collector->IsConcurrentSweepingInProgress()) {
-    collector->WaitUntilSweepingCompleted();
+  if (collector->sweeping_in_progress()) {
+    collector->EnsureSweepingCompleted();
   }
   CHECK(marking->IsMarking() || marking->IsStopped());
   if (marking->IsStopped()) {
     marking->Start();
   }
   CHECK(marking->IsMarking());
   while (!marking->IsComplete()) {
     marking->Step(MB, IncrementalMarking::NO_GC_VIA_STACK_GUARD);
   }
   CHECK(marking->IsComplete());
@@ skipping 1529 matching lines @@
   v8::V8::Initialize();
 
   // Get initial heap size after several full GCs, which will stabilize
   // the heap size and return with sweeping finished completely.
   CcTest::heap()->CollectAllGarbage(Heap::kNoGCFlags);
   CcTest::heap()->CollectAllGarbage(Heap::kNoGCFlags);
   CcTest::heap()->CollectAllGarbage(Heap::kNoGCFlags);
   CcTest::heap()->CollectAllGarbage(Heap::kNoGCFlags);
   CcTest::heap()->CollectAllGarbage(Heap::kNoGCFlags);
   MarkCompactCollector* collector = CcTest::heap()->mark_compact_collector();
-  if (collector->IsConcurrentSweepingInProgress()) {
-    collector->WaitUntilSweepingCompleted();
+  if (collector->sweeping_in_progress()) {
+    collector->EnsureSweepingCompleted();
   }
   int initial_size = static_cast<int>(CcTest::heap()->SizeOfObjects());
 
   {
     // Allocate objects on several different old-space pages so that
     // concurrent sweeper threads will be busy sweeping the old space on
     // subsequent GC runs.
     AlwaysAllocateScope always_allocate(CcTest::i_isolate());
     int filler_size = static_cast<int>(FixedArray::SizeFor(8192));
     for (int i = 1; i <= 100; i++) {
       CcTest::test_heap()->AllocateFixedArray(8192, TENURED).ToObjectChecked();
       CHECK_EQ(initial_size + i * filler_size,
                static_cast<int>(CcTest::heap()->SizeOfObjects()));
     }
   }
 
   // The heap size should go back to initial size after a full GC, even
   // though sweeping didn't finish yet.
   CcTest::heap()->CollectAllGarbage(Heap::kNoGCFlags);
 
   // Normally sweeping would not be complete here, but no guarantees.
 
   CHECK_EQ(initial_size, static_cast<int>(CcTest::heap()->SizeOfObjects()));
 
   // Waiting for sweeper threads should not change heap size.
-  if (collector->IsConcurrentSweepingInProgress()) {
-    collector->WaitUntilSweepingCompleted();
+  if (collector->sweeping_in_progress()) {
+    collector->EnsureSweepingCompleted();
   }
   CHECK_EQ(initial_size, static_cast<int>(CcTest::heap()->SizeOfObjects()));
 }
 
 
 TEST(TestSizeOfObjectsVsHeapIteratorPrecision) {
   CcTest::InitializeVM();
   HeapIterator iterator(CcTest::heap());
   intptr_t size_of_objects_1 = CcTest::heap()->SizeOfObjects();
   intptr_t size_of_objects_2 = 0;
@@ skipping 2772 matching lines @@
 #ifdef DEBUG
 TEST(PathTracer) {
   CcTest::InitializeVM();
   v8::HandleScope scope(CcTest::isolate());
 
   v8::Local<v8::Value> result = CompileRun("'abc'");
   Handle<Object> o = v8::Utils::OpenHandle(*result);
   CcTest::i_isolate()->heap()->TracePathToObject(*o);
 }
 #endif  // DEBUG