1 files changed, 128 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/heap/LargeAllocation.cpp b/Source/JavaScriptCore/heap/LargeAllocation.cpp
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+++ b/Source/JavaScriptCore/heap/LargeAllocation.cpp
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+/*
+ * Copyright (C) 2016-2017 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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 with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "LargeAllocation.h"
+
+#include "Heap.h"
+#include "JSCInlines.h"
+#include "Operations.h"
+
+namespace JSC {
+
+LargeAllocation* LargeAllocation::tryCreate(Heap& heap, size_t size, Subspace* subspace)
+{
+    void* space = tryFastAlignedMalloc(alignment, headerSize() + size);
+    if (!space)
+        return nullptr;
+    if (scribbleFreeCells())
+        scribble(space, size);
+    return new (NotNull, space) LargeAllocation(heap, size, subspace);
+}
+
+LargeAllocation::LargeAllocation(Heap& heap, size_t size, Subspace* subspace)
+    : m_cellSize(size)
+    , m_isNewlyAllocated(true)
+    , m_hasValidCell(true)
+    , m_attributes(subspace->attributes())
+    , m_subspace(subspace)
+    , m_weakSet(heap.vm(), *this)
+{
+    m_isMarked.store(0);
+}
+
+LargeAllocation::~LargeAllocation()
+{
+    if (isOnList())
+        remove();
+}
+
+void LargeAllocation::lastChanceToFinalize()
+{
+    m_weakSet.lastChanceToFinalize();
+    clearMarked();
+    clearNewlyAllocated();
+    sweep();
+}
+
+void LargeAllocation::shrink()
+{
+    m_weakSet.shrink();
+}
+
+void LargeAllocation::visitWeakSet(SlotVisitor& visitor)
+{
+    m_weakSet.visit(visitor);
+}
+
+void LargeAllocation::reapWeakSet()
+{
+    return m_weakSet.reap();
+}
+
+void LargeAllocation::flip()
+{
+    ASSERT(heap()->collectionScope() == CollectionScope::Full);
+    clearMarked();
+}
+
+bool LargeAllocation::isEmpty()
+{
+    return !isMarked() && m_weakSet.isEmpty() && !isNewlyAllocated();
+}
+
+void LargeAllocation::sweep()
+{
+    m_weakSet.sweep();
+    
+    if (m_hasValidCell && !isLive()) {
+        if (m_attributes.destruction == NeedsDestruction)
+            m_subspace->destroy(*vm(), static_cast<JSCell*>(cell()));
+        m_hasValidCell = false;
+    }
+}
+
+void LargeAllocation::destroy()
+{
+    this->~LargeAllocation();
+    fastAlignedFree(this);
+}
+
+void LargeAllocation::dump(PrintStream& out) const
+{
+    out.print(RawPointer(this), ":(cell at ", RawPointer(cell()), " with size ", m_cellSize, " and attributes ", m_attributes, ")");
+}
+
+#if !ASSERT_DISABLED
+void LargeAllocation::assertValidCell(VM& vm, HeapCell* cell) const
+{
+    ASSERT(&vm == this->vm());
+    ASSERT(cell == this->cell());
+    ASSERT(m_hasValidCell);
+}
+#endif
+
+} // namespace JSC
+