CSSValue Immediates: Add move operators to CSSPrimitiveValue

Source/core/css/CSSPrimitiveValue.h

Index: Source/core/css/CSSPrimitiveValue.h
diff --git a/Source/core/css/CSSPrimitiveValue.h b/Source/core/css/CSSPrimitiveValue.h
index 272fc24f553af70d11fa0477d950915a2a884abe..d8b5e613ed0083ce6855741478fb0a4acabc9bd7 100644
--- a/Source/core/css/CSSPrimitiveValue.h
+++ b/Source/core/css/CSSPrimitiveValue.h
@@ -25,7 +25,7 @@
 #include "core/CSSPropertyNames.h"
 #include "core/CSSValueKeywords.h"
 #include "core/CoreExport.h"
-#include "core/css/CSSValue.h"
+#include "core/css/CSSValueObject.h"
 #include "platform/graphics/Color.h"
 #include "wtf/BitVector.h"
 #include "wtf/Forward.h"
@@ -67,11 +67,29 @@ template<> inline float roundForImpreciseConversion(double value)
     return static_cast<float>(value);
 }
 
-// CSSPrimitiveValues are immutable. This class has manual ref-counting
-// of unioned types and does not have the code necessary
-// to handle any kind of mutations.
-class CORE_EXPORT CSSPrimitiveValue : public CSSValueObject {
+// A type of unpacked CSSValue for CSSPrimitiveValue objects. Can only be stack-allocated;
+// pass these around by value.
+// Currently only supports CSSLargePrimitiveValues, but will later support tagged pointers
+// stored as immediates in CSSValues.
+// TODO(sashab): Add tagged pointer support.
+class CORE_EXPORT CSSPrimitiveValue {
+    STACK_ALLOCATED();
 public:
+    typedef union {
+        CSSPropertyID propertyID;
+        CSSValueID valueID;
+        double num;
+        StringImpl* string;
+        RGBA32 rgbcolor;
+        // FIXME: oilpan: Should be members, but no support for members in unions. Just trace the raw ptr for now.
+        CSSBasicShape* shape;
+        CSSCalcValue* calc;
+        Counter* counter;
+        Pair* pair;
+        Rect* rect;
+        Quad* quad;
+    } CSSPrimitiveValueData;
+
     enum UnitType {
         CSS_UNKNOWN = 0,
         CSS_NUMBER = 1,
@@ -91,35 +109,35 @@ public:
         CSS_S = 15,
         CSS_HZ = 16,
         CSS_KHZ = 17,
-        CSS_CUSTOM_IDENT = 19,
-        CSS_URI = 20,
-        CSS_IDENT = 21,
-        CSS_ATTR = 22,
-        CSS_COUNTER = 23,
-        CSS_RECT = 24,
-        CSS_RGBCOLOR = 25,
-        CSS_VW = 26,
-        CSS_VH = 27,
-        CSS_VMIN = 28,
-        CSS_VMAX = 29,
-        CSS_DPPX = 30,
-        CSS_DPI = 31,
-        CSS_DPCM = 32,
-        CSS_FR = 33,
-        CSS_INTEGER = 34,
-        CSS_PAIR = 100,
-        CSS_TURN = 107,
-        CSS_REMS = 108,
-        CSS_CHS = 109,
-        CSS_SHAPE = 111,
-        CSS_QUAD = 112,
-        CSS_CALC = 113,
-        CSS_CALC_PERCENTAGE_WITH_NUMBER = 114,
-        CSS_CALC_PERCENTAGE_WITH_LENGTH = 115,
-        CSS_STRING = 116,
-        CSS_PROPERTY_ID = 117,
-        CSS_VALUE_ID = 118,
-        CSS_QEM = 119
+        CSS_CUSTOM_IDENT = 18,
+        CSS_URI = 19,
+        CSS_IDENT = 20,
+        CSS_ATTR = 21,
+        CSS_COUNTER = 22,
+        CSS_RECT = 23,
+        CSS_RGBCOLOR = 24,
+        CSS_VW = 25,
+        CSS_VH = 26,
+        CSS_VMIN = 27,
+        CSS_VMAX = 28,
+        CSS_DPPX = 29,
+        CSS_DPI = 30,
+        CSS_DPCM = 31,
+        CSS_FR = 32,
+        CSS_INTEGER = 33,
+        CSS_PAIR = 34,
+        CSS_TURN = 35,
+        CSS_REMS = 36,
+        CSS_CHS = 37,
+        CSS_SHAPE = 38,
+        CSS_QUAD = 39,
+        CSS_CALC = 40,
+        CSS_CALC_PERCENTAGE_WITH_NUMBER = 41,
+        CSS_CALC_PERCENTAGE_WITH_LENGTH = 42,
+        CSS_STRING = 43,
+        CSS_PROPERTY_ID = 44,
+        CSS_VALUE_ID = 45,
+        CSS_QEM = 46
     };
 
     enum LengthUnitType {
@@ -141,6 +159,103 @@ public:
     typedef Vector<double, CSSPrimitiveValue::LengthUnitTypeCount> CSSLengthArray;
     typedef BitVector CSSLengthTypeArray;
 
+    // No methods here, don't use this. It's just for large value storage.
+    // IMPORTANT: You should never actually make one of these outside the parser.
+    class CSSLargePrimitiveValue final : public CSSValueObject {
+        friend class CSSPrimitiveValue;
+    public:
+        CSSLargePrimitiveValue(CSSValueID);
+        CSSLargePrimitiveValue(CSSPropertyID);
+        CSSLargePrimitiveValue(RGBA32 color);
+        CSSLargePrimitiveValue(const Length&, float zoom);
+        CSSLargePrimitiveValue(const LengthSize&, const ComputedStyle&);
+        CSSLargePrimitiveValue(const String&, UnitType);
+        CSSLargePrimitiveValue(double, UnitType);
+        CSSLargePrimitiveValue(double, UnitType, bool isQuirkValue);
+
+        template<typename T> CSSLargePrimitiveValue(T); // Defined in CSSPrimitiveValueMappings.h
+        template<typename T> CSSLargePrimitiveValue(T* val)
+            : CSSValueObject(PrimitiveClass)
+        {
+            init(PassRefPtrWillBeRawPtr<T>(val));
+        }
+
+        template<typename T> CSSLargePrimitiveValue(PassRefPtrWillBeRawPtr<T> val)
+            : CSSValueObject(PrimitiveClass)
+        {
+            init(val);
+        }
+
+
+        ~CSSLargePrimitiveValue();
+
+        void cleanup();
+
+        DECLARE_TRACE_AFTER_DISPATCH();
+
+    private:
+        void init(const Length&);
+        void init(const LengthSize&, const ComputedStyle&);
+        void init(PassRefPtrWillBeRawPtr<Counter>);
+        void init(PassRefPtrWillBeRawPtr<Rect>);
+        void init(PassRefPtrWillBeRawPtr<Pair>);
+        void init(PassRefPtrWillBeRawPtr<Quad>);
+        void init(PassRefPtrWillBeRawPtr<CSSBasicShape>);
+        void init(PassRefPtrWillBeRawPtr<CSSCalcValue>);
+
+        CSSPrimitiveValueData m_value;
+    };
+
+    explicit CSSPrimitiveValue(const CSSLargePrimitiveValue* object)
+        : m_rawValue(const_cast<CSSLargePrimitiveValue*>(object))
+    {
+        ref();
+    }
+
+    CSSPrimitiveValue(PassRefPtrWillBeRawPtr<CSSLargePrimitiveValue> cssValue)
+        : m_rawValue(cssValue.leakRef())
+    {
+    }
+
+
+    CSSPrimitiveValue(const CSSPrimitiveValue& other)
+        : m_rawValue(other.m_rawValue)
+    {
+        ref();
+    }
+
+    CSSPrimitiveValue& operator=(const CSSPrimitiveValue& rhs)
+    {
+        rhs.ref();
+        deref();
+        m_rawValue = rhs.m_rawValue;
+        return *this;
+    }
+
+    CSSPrimitiveValue& operator=(CSSPrimitiveValue&& rhs)
+    {
+        m_rawValue = rhs.m_rawValue;
+        rhs.m_rawValue.clear();
+        return *this;
+    }
+
+    CSSPrimitiveValue(CSSPrimitiveValue&& rhs)
+        : m_rawValue(rhs.m_rawValue)
+    {
+        rhs.m_rawValue.clear();
+    }
+
+    ~CSSPrimitiveValue()
+    {
+        deref();
+    }
+
+
+    CSSLargePrimitiveValue* get() const
+    {
+        return m_rawValue.get();
+    }
+
     void accumulateLengthArray(CSSLengthArray&, double multiplier = 1) const;
     void accumulateLengthArray(CSSLengthArray&, CSSLengthTypeArray&, double multiplier = 1) const;
 
@@ -163,22 +278,22 @@ public:
 
     bool isAngle() const
     {
-        return m_primitiveUnitType == CSS_DEG
-               || m_primitiveUnitType == CSS_RAD
-               || m_primitiveUnitType == CSS_GRAD
-               || m_primitiveUnitType == CSS_TURN;
+        return type() == CSS_DEG
+            || type() == CSS_RAD
+            || type() == CSS_GRAD
+            || type() == CSS_TURN;
     }
-    bool isAttr() const { return m_primitiveUnitType == CSS_ATTR; }
-    bool isCounter() const { return m_primitiveUnitType == CSS_COUNTER; }
-    bool isCustomIdent() const { return m_primitiveUnitType == CSS_CUSTOM_IDENT; }
+    bool isAttr() const { return type() == CSS_ATTR; }
+    bool isCounter() const { return type() == CSS_COUNTER; }
+    bool isCustomIdent() const { return type() == CSS_CUSTOM_IDENT; }
     bool isFontRelativeLength() const
     {
-        return m_primitiveUnitType == CSS_EMS
-            || m_primitiveUnitType == CSS_EXS
-            || m_primitiveUnitType == CSS_REMS
-            || m_primitiveUnitType == CSS_CHS;
+        return type() == CSS_EMS
+            || type() == CSS_EXS
+            || type() == CSS_REMS
+            || type() == CSS_CHS;
     }
-    bool isViewportPercentageLength() const { return isViewportPercentageLength(static_cast<UnitType>(m_primitiveUnitType)); }
+    bool isViewportPercentageLength() const { return isViewportPercentageLength(type()); }
     static bool isViewportPercentageLength(UnitType type) { return type >= CSS_VW && type <= CSS_VMAX; }
     static bool isLength(UnitType type)
     {
@@ -188,13 +303,13 @@ public:
     bool isNumber() const { return primitiveType() == CSS_NUMBER || primitiveType() == CSS_INTEGER; }
     bool isPercentage() const { return primitiveType() == CSS_PERCENTAGE; }
     bool isPx() const { return primitiveType() == CSS_PX; }
-    bool isRect() const { return m_primitiveUnitType == CSS_RECT; }
-    bool isRGBColor() const { return m_primitiveUnitType == CSS_RGBCOLOR; }
-    bool isShape() const { return m_primitiveUnitType == CSS_SHAPE; }
-    bool isString() const { return m_primitiveUnitType == CSS_STRING; }
-    bool isTime() const { return m_primitiveUnitType == CSS_S || m_primitiveUnitType == CSS_MS; }
-    bool isURI() const { return m_primitiveUnitType == CSS_URI; }
-    bool isCalculated() const { return m_primitiveUnitType == CSS_CALC; }
+    bool isRect() const { return type() == CSS_RECT; }
+    bool isRGBColor() const { return type() == CSS_RGBCOLOR; }
+    bool isShape() const { return type() == CSS_SHAPE; }
+    bool isString() const { return type() == CSS_STRING; }
+    bool isTime() const { return type() == CSS_S || type() == CSS_MS; }
+    bool isURI() const { return type() == CSS_URI; }
+    bool isCalculated() const { return type() == CSS_CALC; }
     bool isCalculatedPercentageWithNumber() const { return primitiveType() == CSS_CALC_PERCENTAGE_WITH_NUMBER; }
     bool isCalculatedPercentageWithLength() const { return primitiveType() == CSS_CALC_PERCENTAGE_WITH_LENGTH; }
     static bool isDotsPerInch(UnitType type) { return type == CSS_DPI; }
@@ -202,67 +317,62 @@ public:
     static bool isDotsPerCentimeter(UnitType type) { return type == CSS_DPCM; }
     static bool isResolution(UnitType type) { return type >= CSS_DPPX && type <= CSS_DPCM; }
     bool isFlex() const { return primitiveType() == CSS_FR; }
-    bool isValueID() const { return m_primitiveUnitType == CSS_VALUE_ID; }
+    bool isValueID() const { return type() == CSS_VALUE_ID; }
     bool colorIsDerivedFromElement() const;
 
-    static PassRefPtrWillBeRawPtr<CSSPrimitiveValue> createIdentifier(CSSValueID valueID)
+    static CSSPrimitiveValue createIdentifier(CSSValueID valueID)
     {
-        return adoptRefWillBeNoop(new CSSPrimitiveValue(valueID));
+        return CSSPrimitiveValue(adoptRefWillBeNoop(new CSSLargePrimitiveValue(valueID)));
     }
-    static PassRefPtrWillBeRawPtr<CSSPrimitiveValue> createIdentifier(CSSPropertyID propertyID)
+
+    static CSSPrimitiveValue createIdentifier(CSSPropertyID propertyID)
     {
-        return adoptRefWillBeNoop(new CSSPrimitiveValue(propertyID));
+        return CSSPrimitiveValue(adoptRefWillBeNoop(new CSSLargePrimitiveValue(propertyID)));
     }
-    static PassRefPtrWillBeRawPtr<CSSPrimitiveValue> createColor(RGBA32 rgbValue)
+    static CSSPrimitiveValue createColor(RGBA32 rgbValue)
     {
-        return adoptRefWillBeNoop(new CSSPrimitiveValue(rgbValue));
+        return CSSPrimitiveValue(adoptRefWillBeNoop(new CSSLargePrimitiveValue(rgbValue)));
     }
-    static PassRefPtrWillBeRawPtr<CSSPrimitiveValue> create(double value, UnitType type)
+    static CSSPrimitiveValue create(double value, UnitType type)
     {
-        return adoptRefWillBeNoop(new CSSPrimitiveValue(value, type));
+        return CSSPrimitiveValue(adoptRefWillBeNoop(new CSSLargePrimitiveValue(value, type)));
     }
-    static PassRefPtrWillBeRawPtr<CSSPrimitiveValue> create(const String& value, UnitType type)
+    static CSSPrimitiveValue create(const String& value, UnitType type)
     {
-        return adoptRefWillBeNoop(new CSSPrimitiveValue(value, type));
+        return CSSPrimitiveValue(adoptRefWillBeNoop(new CSSLargePrimitiveValue(value, type)));
     }
-    static PassRefPtrWillBeRawPtr<CSSPrimitiveValue> create(const Length& value, float zoom)
+    static CSSPrimitiveValue create(const Length& value, float zoom)
     {
-        return adoptRefWillBeNoop(new CSSPrimitiveValue(value, zoom));
+        return CSSPrimitiveValue(adoptRefWillBeNoop(new CSSLargePrimitiveValue(value, zoom)));
     }
-    static PassRefPtrWillBeRawPtr<CSSPrimitiveValue> create(const LengthSize& value, const ComputedStyle& style)
+    static CSSPrimitiveValue create(const LengthSize& value, const ComputedStyle& style)
     {
-        return adoptRefWillBeNoop(new CSSPrimitiveValue(value, style));
+        return CSSPrimitiveValue(adoptRefWillBeNoop(new CSSLargePrimitiveValue(value, style)));
     }
-    template<typename T> static PassRefPtrWillBeRawPtr<CSSPrimitiveValue> create(T value)
+    template<typename T> static CSSPrimitiveValue create(T value)
     {
-        return adoptRefWillBeNoop(new CSSPrimitiveValue(value));
+        return CSSPrimitiveValue(adoptRefWillBeNoop(new CSSLargePrimitiveValue(value)));
     }
 
     // This value is used to handle quirky margins in reflow roots (body, td, and th) like WinIE.
     // The basic idea is that a stylesheet can use the value __qem (for quirky em) instead of em.
     // When the quirky value is used, if you're in quirks mode, the margin will collapse away
     // inside a table cell.
-    static PassRefPtrWillBeRawPtr<CSSPrimitiveValue> createAllowingMarginQuirk(double value, UnitType type)
+    static CSSPrimitiveValue createAllowingMarginQuirk(double value, UnitType type)
     {
-        CSSPrimitiveValue* quirkValue = new CSSPrimitiveValue(value, type);
-        quirkValue->m_isQuirkValue = true;
-        return adoptRefWillBeNoop(quirkValue);
+        return CSSPrimitiveValue(adoptRefWillBeNoop(new CSSLargePrimitiveValue(value, type, true)));
     }
 
-    ~CSSPrimitiveValue();
-
-    void cleanup();
-
     UnitType primitiveType() const;
 
     double computeDegrees() const;
-    double computeSeconds();
+    double computeSeconds() const;
 
     // Computes a length in pixels, resolving relative lengths
-    template<typename T> T computeLength(const CSSToLengthConversionData&);
+    template<typename T> T computeLength(const CSSToLengthConversionData&) const;
 
     // Converts to a Length (Fixed, Percent or Calculated)
-    Length convertToLength(const CSSToLengthConversionData&);
+    Length convertToLength(const CSSToLengthConversionData&) const;
 
     double getDoubleValue() const;
     float getFloatValue() const { return getValue<float>(); }
@@ -271,33 +381,36 @@ public:
 
     String getStringValue() const;
 
-    Counter* getCounterValue() const { return m_primitiveUnitType != CSS_COUNTER ? 0 : m_value.counter; }
+    Counter* getCounterValue() const { return type() != CSS_COUNTER ? 0 : value().counter; }
 
-    Rect* getRectValue() const { return m_primitiveUnitType != CSS_RECT ? 0 : m_value.rect; }
+    Rect* getRectValue() const { return type() != CSS_RECT ? 0 : value().rect; }
 
-    Quad* getQuadValue() const { return m_primitiveUnitType != CSS_QUAD ? 0 : m_value.quad; }
+    Quad* getQuadValue() const { return type() != CSS_QUAD ? 0 : value().quad; }
 
-    RGBA32 getRGBA32Value() const { return m_primitiveUnitType != CSS_RGBCOLOR ? 0 : m_value.rgbcolor; }
+    RGBA32 getRGBA32Value() const { return type() != CSS_RGBCOLOR ? 0 : value().rgbcolor; }
 
-    Pair* getPairValue() const { return m_primitiveUnitType != CSS_PAIR ? 0 : m_value.pair; }
+    Pair* getPairValue() const { return type() != CSS_PAIR ? 0 : value().pair; }
 
-    CSSBasicShape* getShapeValue() const { return m_primitiveUnitType != CSS_SHAPE ? 0 : m_value.shape; }
+    CSSBasicShape* getShapeValue() const { return type() != CSS_SHAPE ? 0 : value().shape; }
 
-    CSSCalcValue* cssCalcValue() const { return m_primitiveUnitType != CSS_CALC ? 0 : m_value.calc; }
+    CSSCalcValue* cssCalcValue() const { return type() != CSS_CALC ? 0 : value().calc; }
 
-    CSSPropertyID getPropertyID() const { return m_primitiveUnitType == CSS_PROPERTY_ID ? m_value.propertyID : CSSPropertyInvalid; }
-    CSSValueID getValueID() const { return m_primitiveUnitType == CSS_VALUE_ID ? m_value.valueID : CSSValueInvalid; }
+    CSSPropertyID getPropertyID() const { return type() == CSS_PROPERTY_ID ? value().propertyID : CSSPropertyInvalid; }
+    CSSValueID getValueID() const { return type() == CSS_VALUE_ID ? value().valueID : CSSValueInvalid; }
 
     template<typename T> inline operator T() const; // Defined in CSSPrimitiveValueMappings.h
 
     static const char* unitTypeToString(UnitType);
+    // TODO(sashab): Remove customCSSText() once CSSValueObject uses vtables properly.
     String customCSSText() const;
+    String cssText() const { return customCSSText(); }
 
-    bool isQuirkValue() { return m_isQuirkValue; }
-
-    bool equals(const CSSPrimitiveValue&) const;
+    bool isQuirkValue() const
+    {
+        return m_rawValue->m_isQuirkValue;
+    }
 
-    DECLARE_TRACE_AFTER_DISPATCH();
+    bool equals(const CSSPrimitiveValue) const;
 
     static UnitType canonicalUnitTypeForCategory(UnitCategory);
     static double conversionToCanonicalUnitsScaleFactor(UnitType);
@@ -306,63 +419,54 @@ public:
     static bool unitTypeToLengthUnitType(UnitType, LengthUnitType&);
     static UnitType lengthUnitTypeToUnitType(LengthUnitType);
 
+    DEFINE_INLINE_TRACE()
+    {
+        visitor->trace(m_rawValue);
+        m_rawValue->traceAfterDispatch(visitor);
+    }
+
 private:
-    CSSPrimitiveValue(CSSValueID);
-    CSSPrimitiveValue(CSSPropertyID);
-    CSSPrimitiveValue(RGBA32 color);
-    CSSPrimitiveValue(const Length&, float zoom);
-    CSSPrimitiveValue(const LengthSize&, const ComputedStyle&);
-    CSSPrimitiveValue(const String&, UnitType);
-    CSSPrimitiveValue(double, UnitType);
-
-    template<typename T> CSSPrimitiveValue(T); // Defined in CSSPrimitiveValueMappings.h
-    template<typename T> CSSPrimitiveValue(T* val)
-        : CSSValueObject(PrimitiveClass)
+    void ref() const
     {
-        init(PassRefPtrWillBeRawPtr<T>(val));
+#if !ENABLE(OILPAN)
+        m_rawValue->ref();
+#endif
     }
 
-    template<typename T> CSSPrimitiveValue(PassRefPtrWillBeRawPtr<T> val)
-        : CSSValueObject(PrimitiveClass)
+    void deref() const
     {
-        init(val);
+#if !ENABLE(OILPAN)
+        // Might be null due to move semantics.
+        if (m_rawValue)
+            m_rawValue->deref();
+#endif
     }
 
     static void create(int); // compile-time guard
     static void create(unsigned); // compile-time guard
     template<typename T> operator T*(); // compile-time guard
 
-    void init(const Length&);
-    void init(const LengthSize&, const ComputedStyle&);
-    void init(PassRefPtrWillBeRawPtr<Counter>);
-    void init(PassRefPtrWillBeRawPtr<Rect>);
-    void init(PassRefPtrWillBeRawPtr<Pair>);
-    void init(PassRefPtrWillBeRawPtr<Quad>);
-    void init(PassRefPtrWillBeRawPtr<CSSBasicShape>);
-    void init(PassRefPtrWillBeRawPtr<CSSCalcValue>);
+    double computeLengthDouble(const CSSToLengthConversionData&) const;
 
-    double computeLengthDouble(const CSSToLengthConversionData&);
+    RawPtrWillBeMember<CSSLargePrimitiveValue> m_rawValue;
+    static_assert(sizeof(m_rawValue) == sizeof(void*), "The tagged pointer field in CSSPrimitiveValue must be the size of a pointer");
 
-    union {
-        CSSPropertyID propertyID;
-        CSSValueID valueID;
-        double num;
-        StringImpl* string;
-        RGBA32 rgbcolor;
-        // FIXME: oilpan: Should be members, but no support for members in unions. Just trace the raw ptr for now.
-        CSSBasicShape* shape;
-        CSSCalcValue* calc;
-        Counter* counter;
-        Pair* pair;
-        Rect* rect;
-        Quad* quad;
-    } m_value;
+    // Getters/setters for inner class.
+    CSSPrimitiveValueData value() const
+    {
+        return m_rawValue->m_value;
+    }
+
+    UnitType type() const
+    {
+        return static_cast<UnitType>(m_rawValue->m_primitiveUnitType);
+    }
 };
 
 typedef CSSPrimitiveValue::CSSLengthArray CSSLengthArray;
 typedef CSSPrimitiveValue::CSSLengthTypeArray CSSLengthTypeArray;
 
-DEFINE_CSS_VALUE_TYPE_CASTS(CSSPrimitiveValue, isPrimitiveValue());
+static_assert(sizeof(CSSPrimitiveValue) == sizeof(void*), "CSSPrimitiveValue must be the size of a pointer");
 
 } // namespace blink