runtime/JSDestructibleObject.h

   1 #ifndef JSDestructibleObject_h
   2 #define JSDestructibleObject_h
   3
   4 #include "JSObject.h"
   5
   6 namespace JSC {
   7
   8 struct ClassInfo;
   9
  10 class JSDestructibleObject : public JSNonFinalObject {
  11 public:
  12     typedef JSNonFinalObject Base;
  13
  14     static const bool needsDestruction = true;
  15
  16     const ClassInfo* classInfo() const { return m_classInfo; }
  17
  18     static ptrdiff_t classInfoOffset() { return OBJECT_OFFSETOF(JSDestructibleObject, m_classInfo); }
  19
  20 protected:
  21     JSDestructibleObject(VM& vm, Structure* structure, Butterfly* butterfly = 0)
  22         : JSNonFinalObject(vm, structure, butterfly)
  23         , m_classInfo(structure->classInfo())
  24     {
  25         ASSERT(m_classInfo);
  26     }
  27
  28 private:
  29     const ClassInfo* m_classInfo;
  30 };
  31
  32 inline const ClassInfo* JSCell::classInfo() const
  33 {
  34     MarkedBlock* block = MarkedBlock::blockFor(this);
  35     if (block->destructorType() == MarkedBlock::Normal)
  36         return static_cast<const JSDestructibleObject*>(this)->classInfo();
  37     return structure(*block->vm())->classInfo();
  38 }
  39
  40 } // namespace JSC
  41
  42 #endif