From 6882a04fb36642862b11efe514251d32070c3d65 Mon Sep 17 00:00:00 2001
From: Konstantin Tokarev <annulen@yandex.ru>
Date: Thu, 25 Aug 2016 19:20:41 +0300
Subject: Imported QtWebKit TP3 (git b57bc6801f1876c3220d5a4bfea33d620d477443)

Change-Id: I3b1d8a2808782c9f34d50240000e20cb38d3680f
Reviewed-by: Konstantin Tokarev <annulen@yandex.ru>
---
 .../heap/GCIncomingRefCountedInlines.h             | 130 +++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 Source/JavaScriptCore/heap/GCIncomingRefCountedInlines.h

(limited to 'Source/JavaScriptCore/heap/GCIncomingRefCountedInlines.h')

diff --git a/Source/JavaScriptCore/heap/GCIncomingRefCountedInlines.h b/Source/JavaScriptCore/heap/GCIncomingRefCountedInlines.h
new file mode 100644
index 000000000..41330ecb9
--- /dev/null
+++ b/Source/JavaScriptCore/heap/GCIncomingRefCountedInlines.h
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2013 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. 
+ */
+
+#ifndef GCIncomingRefCountedInlines_h
+#define GCIncomingRefCountedInlines_h
+
+#include "GCIncomingRefCounted.h"
+#include "Heap.h"
+
+namespace JSC {
+
+template<typename T>
+bool GCIncomingRefCounted<T>::addIncomingReference(JSCell* cell)
+{
+    if (!hasAnyIncoming()) {
+        m_encodedPointer = bitwise_cast<uintptr_t>(cell) | singletonFlag();
+        this->setIsDeferred(true);
+        ASSERT(hasSingleton());
+        return true;
+    }
+    
+    ASSERT(Heap::heap(incomingReferenceAt(0)) == Heap::heap(cell));
+    
+    if (hasSingleton()) {
+        Vector<JSCell*>* vector = new Vector<JSCell*>();
+        vector->append(singleton());
+        vector->append(cell);
+        m_encodedPointer = bitwise_cast<uintptr_t>(vector);
+        ASSERT(hasVectorOfCells());
+        return false;
+    }
+    
+    vectorOfCells()->append(cell);
+    return false;
+}
+
+template<typename T>
+template<typename FilterFunctionType>
+bool GCIncomingRefCounted<T>::filterIncomingReferences(FilterFunctionType& filterFunction)
+{
+    const bool verbose = false;
+    
+    if (verbose)
+        dataLog("Filtering incoming references.\n");
+    
+    if (!hasAnyIncoming()) {
+        ASSERT(!this->isDeferred());
+        ASSERT(this->refCount());
+        if (verbose)
+            dataLog("    Has no incoming.\n");
+        return false;
+    }
+    
+    ASSERT(this->isDeferred());
+    
+    if (hasSingleton()) {
+        if (filterFunction(singleton())) {
+            if (verbose)
+                dataLog("   Singleton passed.\n");
+            return false;
+        }
+        
+        if (verbose)
+            dataLog("   Removing singleton.\n");
+        m_encodedPointer = 0;
+        ASSERT(!hasAnyIncoming());
+        this->setIsDeferred(false);
+        return true;
+    }
+    
+    if (verbose)
+        dataLog("   Has ", vectorOfCells()->size(), " entries.\n");
+    for (size_t i = 0; i < vectorOfCells()->size(); ++i) {
+        if (filterFunction(vectorOfCells()->at(i)))
+            continue;
+        vectorOfCells()->at(i--) = vectorOfCells()->last();
+        vectorOfCells()->removeLast();
+    }
+    
+    if (vectorOfCells()->size() >= 2) {
+        if (verbose)
+            dataLog("   Still has ", vectorOfCells()->size(), " entries.\n");
+        return false;
+    }
+    
+    if (vectorOfCells()->isEmpty()) {
+        if (verbose)
+            dataLog("   Removing.\n");
+        delete vectorOfCells();
+        m_encodedPointer = 0;
+        ASSERT(!hasAnyIncoming());
+        this->setIsDeferred(false);
+        return true;
+    }
+    
+    if (verbose)
+        dataLog("   Shrinking to singleton.\n");
+    JSCell* singleton = vectorOfCells()->at(0);
+    delete vectorOfCells();
+    m_encodedPointer = bitwise_cast<uintptr_t>(singleton) | singletonFlag();
+    ASSERT(hasSingleton());
+    return false;
+}
+
+} // namespace JSC
+
+#endif // GCIncomingRefCountedInlines_h
+
-- 
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