Changeset 48264 in webkit for trunk/JavaScriptCore/wtf

Timestamp:

Sep 10, 2009, 1:01:57 PM (16 years ago)

Author:

[email protected]

Message:

Refactor StructureTransitionTable and Structure to unify handling of the single slot optimization
​https://bugs.webkit.org/show_bug.cgi?id=29141

Reviewed by Geoff Garen

Make StructureTransitionTable encapsulate the single transition slot optimization.

File:

• trunk/JavaScriptCore/wtf/PtrAndFlags.h (modified) (3 diffs)

trunk/JavaScriptCore/wtf/PtrAndFlags.h

@@ -35 +35 @@
 
 namespace WTF {
-    template<class T, typename FlagEnum> class PtrAndFlags {
+    template<class T, typename FlagEnum> class PtrAndFlagsBase {
     public:
-        PtrAndFlags() : m_ptrAndFlags(0) {}
-        PtrAndFlags(T* ptr) : m_ptrAndFlags(0) { set(ptr); }
-
         bool isFlagSet(FlagEnum flagNumber) const { ASSERT(flagNumber < 2); return m_ptrAndFlags & (1 << flagNumber); }
         void setFlag(FlagEnum flagNumber) { ASSERT(flagNumber < 2); m_ptrAndFlags |= (1 << flagNumber);}
@@ -56 +53 @@
         T* operator->() const { return reinterpret_cast<T*>(m_ptrAndFlags & ~3); }
 
-    private:
+    protected:
         intptr_t m_ptrAndFlags;
 #ifndef NDEBUG
@@ -62 +59 @@
 #endif
     };
+
+    template<class T, typename FlagEnum> class PtrAndFlags : public PtrAndFlagsBase<T, FlagEnum> {
+    public:
+        PtrAndFlags()
+        {
+            PtrAndFlagsBase<T, FlagEnum>::m_ptrAndFlags = 0;
+        }
+        PtrAndFlags(T* ptr)
+        {
+            PtrAndFlagsBase<T, FlagEnum>::m_ptrAndFlags = 0;
+            set(ptr);
+        }
+    };
 } // namespace WTF
 
+using WTF::PtrAndFlagsBase;
 using WTF::PtrAndFlags;