Revert of Oilpan: Implement a GC to take a heap snapshot

Source/platform/heap/Heap.cpp

Index: Source/platform/heap/Heap.cpp
diff --git a/Source/platform/heap/Heap.cpp b/Source/platform/heap/Heap.cpp
index 60728378e427c204c2b887a37ef1a038cf61736f..5b22fc005fe02f671dabda31ac24c08980abb24e 100644
--- a/Source/platform/heap/Heap.cpp
+++ b/Source/platform/heap/Heap.cpp
@@ -299,28 +299,6 @@
     ASSERT(!m_firstUnsweptPage);
 }
 
-void BaseHeap::makeConsistentForMutator()
-{
-    clearFreeLists();
-    ASSERT(isConsistentForGC());
-    ASSERT(!m_firstPage);
-
-    // Drop marks from marked objects and rebuild free lists in preparation for
-    // resuming the executions of mutators.
-    BasePage* previousPage = nullptr;
-    for (BasePage* page = m_firstUnsweptPage; page; previousPage = page, page = page->next()) {
-        page->makeConsistentForMutator();
-        page->markAsSwept();
-    }
-    if (previousPage) {
-        ASSERT(m_firstUnsweptPage);
-        previousPage->m_next = m_firstPage;
-        m_firstPage = m_firstUnsweptPage;
-        m_firstUnsweptPage = nullptr;
-    }
-    ASSERT(!m_firstUnsweptPage);
-}
-
 size_t BaseHeap::objectPayloadSizeForTesting()
 {
     ASSERT(isConsistentForGC());
@@ -342,7 +320,7 @@
 
 void BaseHeap::prepareForSweep()
 {
-    ASSERT(threadState()->isInGC());
+    ASSERT(!threadState()->isInGC());
     ASSERT(!m_firstUnsweptPage);
 
     // Move all pages to a list of unswept pages.
@@ -1201,37 +1179,6 @@
         Heap::increaseMarkedObjectSize(markedObjectSize);
 }
 
-void NormalPage::makeConsistentForMutator()
-{
-    size_t markedObjectSize = 0;
-    Address startOfGap = payload();
-    for (Address headerAddress = payload(); headerAddress < payloadEnd();) {
-        HeapObjectHeader* header = reinterpret_cast<HeapObjectHeader*>(headerAddress);
-        ASSERT(header->size() < blinkPagePayloadSize());
-        // Check if a free list entry first since we cannot call
-        // isMarked on a free list entry.
-        if (header->isFree()) {
-            headerAddress += header->size();
-            continue;
-        }
-        header->checkHeader();
-
-        if (startOfGap != headerAddress)
-            heapForNormalPage()->addToFreeList(startOfGap, headerAddress - startOfGap);
-        if (header->isMarked()) {
-            header->unmark();
-            markedObjectSize += header->size();
-        }
-        headerAddress += header->size();
-        startOfGap = headerAddress;
-    }
-    if (startOfGap != payloadEnd())
-        heapForNormalPage()->addToFreeList(startOfGap, payloadEnd() - startOfGap);
-
-    if (markedObjectSize)
-        Heap::increaseMarkedObjectSize(markedObjectSize);
-}
-
 #if defined(ADDRESS_SANITIZER)
 void NormalPage::poisonUnmarkedObjects()
 {
@@ -1518,15 +1465,6 @@
         Heap::increaseMarkedObjectSize(size());
     } else {
         header->markDead();
-    }
-}
-
-void LargeObjectPage::makeConsistentForMutator()
-{
-    HeapObjectHeader* header = heapObjectHeader();
-    if (header->isMarked()) {
-        header->unmark();
-        Heap::increaseMarkedObjectSize(size());
     }
 }