[Experimental] CSSSerializer Proof-of-concept

third_party/WebKit/Source/core/css/StylePropertySet.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 11 matching lines @@
 
 #include "core/css/StylePropertySet.h"
 
 #include "core/StylePropertyShorthand.h"
 #include "core/css/CSSCustomPropertyDeclaration.h"
 #include "core/css/CSSPropertyMetadata.h"
 #include "core/css/CSSValuePool.h"
 #include "core/css/StylePropertySerializer.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/css/parser/CSSParser.h"
+#include "core/css/serializer/CSSDeserializeStream.h"
+#include "core/css/serializer/CSSSerializeStream.h"
 #include "core/frame/UseCounter.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "wtf/text/StringBuilder.h"
 
 #ifndef NDEBUG
 #include "wtf/text/CString.h"
 #include <stdio.h>
 #endif
 
 namespace blink {
 
 static size_t sizeForImmutableStylePropertySetWithPropertyCount(unsigned count)
 {
     return sizeof(ImmutableStylePropertySet) - sizeof(void*) + sizeof(RawPtrWillBeMember<CSSValue>) * count + sizeof(StylePropertyMetadata) * count;
 }
 
 PassRefPtrWillBeRawPtr<ImmutableStylePropertySet> ImmutableStylePropertySet::create(const CSSProperty* properties, unsigned count, CSSParserMode cssParserMode)
 {
     ASSERT(count <= MaxArraySize);
 #if ENABLE(OILPAN)
     void* slot = Heap::allocate<StylePropertySet>(sizeForImmutableStylePropertySetWithPropertyCount(count));
 #else
     void* slot = WTF::Partitions::fastMalloc(sizeForImmutableStylePropertySetWithPropertyCount(count), "blink::ImmutableStylePropertySet");
 #endif // ENABLE(OILPAN)
     return adoptRefWillBeNoop(new (slot) ImmutableStylePropertySet(properties, count, cssParserMode));
 }
 
+PassRefPtrWillBeRawPtr<ImmutableStylePropertySet> ImmutableStylePropertySet::deserialize(CSSDeserializeStream* stream)
+{
+    unsigned count = stream->readUnsigned();
+    CSSParserMode cssParserMode = HTMLStandardMode; // FIXME!!!
+    CSDEBUG("ImmutableStylePropertySet::deserialize count: %u\n", count);
+
+    ASSERT(count <= MaxArraySize);
+#if ENABLE(OILPAN)
+    void* slot = Heap::allocate<StylePropertySet>(sizeForImmutableStylePropertySetWithPropertyCount(count));
+#else
+    void* slot = WTF::Partitions::fastMalloc(sizeForImmutableStylePropertySetWithPropertyCount(count), "blink::ImmutableStylePropertySet");
+#endif // ENABLE(OILPAN)
+    return adoptRefWillBeNoop(new (slot) ImmutableStylePropertySet(stream, count, cssParserMode));
+}
+
 PassRefPtrWillBeRawPtr<ImmutableStylePropertySet> StylePropertySet::immutableCopyIfNeeded() const
 {
     if (!isMutable())
         return toImmutableStylePropertySet(const_cast<StylePropertySet*>(this));
     const MutableStylePropertySet* mutableThis = toMutableStylePropertySet(this);
     return ImmutableStylePropertySet::create(mutableThis->m_propertyVector.data(), mutableThis->m_propertyVector.size(), cssParserMode());
 }
 
 MutableStylePropertySet::MutableStylePropertySet(CSSParserMode cssParserMode)
     : StylePropertySet(cssParserMode)
@@ skipping 15 matching lines @@
     RawPtrWillBeMember<CSSValue>* valueArray = const_cast<RawPtrWillBeMember<CSSValue>*>(this->valueArray());
     for (unsigned i = 0; i < m_arraySize; ++i) {
         metadataArray[i] = properties[i].metadata();
         valueArray[i] = properties[i].value();
 #if !ENABLE(OILPAN)
         valueArray[i]->ref();
 #endif
     }
 }
 
+ImmutableStylePropertySet::ImmutableStylePropertySet(CSSDeserializeStream* stream, unsigned length, CSSParserMode cssParserMode)
+    : StylePropertySet(cssParserMode, length)
+{
+    StylePropertyMetadata* metadataArray = const_cast<StylePropertyMetadata*>(this->metadataArray());
+    RawPtrWillBeMember<CSSValue>* valueArray = const_cast<RawPtrWillBeMember<CSSValue>*>(this->valueArray());
+    for (unsigned i = 0; i < m_arraySize; ++i) {
+        metadataArray[i] = stream->readStylePropertyMetadata();
+    }
+    for (unsigned i = 0; i < m_arraySize; ++i) {
+        valueArray[i] = CSSValue::deserialize(stream).leakRef();
+#if !ENABLE(OILPAN)
+        valueArray[i]->ref(); // FIXME: maybe not needed as above "leaks"
+#endif
+    }
+}
+
 ImmutableStylePropertySet::~ImmutableStylePropertySet()
 {
 #if !ENABLE(OILPAN)
     RawPtrWillBeMember<CSSValue>* valueArray = const_cast<RawPtrWillBeMember<CSSValue>*>(this->valueArray());
     for (unsigned i = 0; i < m_arraySize; ++i) {
         // Checking for nullptr here is a workaround to prevent crashing.  http://crbug.com/449032
         if (valueArray[i])
             valueArray[i]->deref();
     }
 #endif
@@ skipping 34 matching lines @@
     for (int n = m_arraySize - 1 ; n >= 0; --n) {
         if (isPropertyMatch(metadataArray()[n], *valueArray()[n], id, property))
             return n;
     }
 
     return -1;
 }
 template CORE_EXPORT int ImmutableStylePropertySet::findPropertyIndex(CSSPropertyID) const;
 template CORE_EXPORT int ImmutableStylePropertySet::findPropertyIndex(AtomicString) const;
 
+void ImmutableStylePropertySet::serializeAfterDispatch(CSSSerializeStream* stream) const
+{
+    // FIXME: handle CSSParserMode
+    stream->writeUnsigned(m_arraySize);
+    CSDEBUG("ImmutableStylePropertySet::serializeAfterDispatch count: %u\n", m_arraySize);
+
+    auto metadatas = metadataArray();
+    for (unsigned i = 0; i < m_arraySize; i++) {
+        stream->writeStylePropertyMetadata(metadatas[i]);
+    }
+
+    const RawPtrWillBeMember<CSSValue>* values = valueArray();
+    for (unsigned i = 0; i < m_arraySize; i++) {
+        values[i]->serialize(stream);
+    }
+}
+
 DEFINE_TRACE_AFTER_DISPATCH(ImmutableStylePropertySet)
 {
     const RawPtrWillBeMember<CSSValue>* values = valueArray();
     for (unsigned i = 0; i < m_arraySize; i++)
         visitor->trace(values[i]);
     StylePropertySet::traceAfterDispatch(visitor);
 }
 
 MutableStylePropertySet::MutableStylePropertySet(const StylePropertySet& other)
     : StylePropertySet(other.cssParserMode())
@@ skipping 396 matching lines @@
 
 DEFINE_TRACE_AFTER_DISPATCH(MutableStylePropertySet)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_cssomWrapper);
     visitor->trace(m_propertyVector);
 #endif
     StylePropertySet::traceAfterDispatch(visitor);
 }
 
+void StylePropertySet::serialize(CSSSerializeStream* stream) const
+{
+    CSDEBUG("StylePropertySet::serialize\n");
+
+    ASSERT(!m_isMutable);
+    toImmutableStylePropertySet(this)->serializeAfterDispatch(stream);
+}
+
 unsigned StylePropertySet::averageSizeInBytes()
 {
     // Please update this if the storage scheme changes so that this longer reflects the actual size.
     return sizeForImmutableStylePropertySetWithPropertyCount(4);
 }
 
 // See the function above if you need to update this.
 struct SameSizeAsStylePropertySet : public RefCountedWillBeGarbageCollectedFinalized<SameSizeAsStylePropertySet> {
     unsigned bitfield;
 };
@@ skipping 10 matching lines @@
 {
     return adoptRefWillBeNoop(new MutableStylePropertySet(cssParserMode));
 }
 
 PassRefPtrWillBeRawPtr<MutableStylePropertySet> MutableStylePropertySet::create(const CSSProperty* properties, unsigned count)
 {
     return adoptRefWillBeNoop(new MutableStylePropertySet(properties, count));
 }
 
 } // namespace blink