Correctify instanceof and make it optimizable.

src/code-stubs.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CODE_STUBS_H_
 #define V8_CODE_STUBS_H_
 
 #include "src/allocation.h"
 #include "src/assembler.h"
 #include "src/codegen.h"
@@ skipping 16 matching lines @@
   V(CallApiAccessor)                        \
   V(CallApiGetter)                          \
   V(CallConstruct)                          \
   V(CallFunction)                           \
   V(CallIC)                                 \
   V(CallIC_Array)                           \
   V(CEntry)                                 \
   V(CompareIC)                              \
   V(DoubleToI)                              \
   V(FunctionPrototype)                      \
-  V(Instanceof)                             \
+  V(InstanceOf)                             \
   V(InternalArrayConstructor)               \
   V(JSEntry)                                \
   V(KeyedLoadICTrampoline)                  \
   V(LoadICTrampoline)                       \
   V(CallICTrampoline)                       \
   V(CallIC_ArrayTrampoline)                 \
   V(LoadIndexedInterceptor)                 \
   V(LoadIndexedString)                      \
   V(MathPow)                                \
   V(ProfileEntryHook)                       \
@@ skipping 845 matching lines @@
   bool is_js_array() const { return IsJsArrayBits::decode(sub_minor_key()); }
 
  private:
   class ElementsKindBits : public BitField<ElementsKind, 0, 8> {};
   class IsJsArrayBits : public BitField<bool, ElementsKindBits::kNext, 1> {};
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(GrowArrayElements);
   DEFINE_HYDROGEN_CODE_STUB(GrowArrayElements, HydrogenCodeStub);
 };
 
-class InstanceofStub: public PlatformCodeStub {
+
+class InstanceOfStub final : public PlatformCodeStub {
  public:
-  enum Flags {
-    kNoFlags = 0,
-    kArgsInRegisters = 1 << 0,
-    kCallSiteInlineCheck = 1 << 1,
-    kReturnTrueFalseObject = 1 << 2
-  };
-
-  InstanceofStub(Isolate* isolate, Flags flags) : PlatformCodeStub(isolate) {
-    minor_key_ = FlagBits::encode(flags);
-  }
-
-  static Register left() { return InstanceofDescriptor::left(); }
-  static Register right() { return InstanceofDescriptor::right(); }
-
-  CallInterfaceDescriptor GetCallInterfaceDescriptor() const override {
-    if (HasArgsInRegisters()) {
-      return InstanceofDescriptor(isolate());
-    }
-    return ContextOnlyDescriptor(isolate());
-  }
+  explicit InstanceOfStub(Isolate* isolate) : PlatformCodeStub(isolate) {}
 
  private:
-  Flags flags() const { return FlagBits::decode(minor_key_); }
-
-  bool HasArgsInRegisters() const { return (flags() & kArgsInRegisters) != 0; }
-
-  bool HasCallSiteInlineCheck() const {
-    return (flags() & kCallSiteInlineCheck) != 0;
-  }
-
-  bool ReturnTrueFalseObject() const {
-    return (flags() & kReturnTrueFalseObject) != 0;
-  }
-
-  void PrintName(std::ostream& os) const override;  // NOLINT
-
-  class FlagBits : public BitField<Flags, 0, 3> {};
-
-  DEFINE_PLATFORM_CODE_STUB(Instanceof, PlatformCodeStub);
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(InstanceOf);
+  DEFINE_PLATFORM_CODE_STUB(InstanceOf, PlatformCodeStub);
 };
 
 
 enum AllocationSiteOverrideMode {
   DONT_OVERRIDE,
   DISABLE_ALLOCATION_SITES,
   LAST_ALLOCATION_SITE_OVERRIDE_MODE = DISABLE_ALLOCATION_SITES
 };
 
 
@@ skipping 2121 matching lines @@
 #undef DEFINE_PLATFORM_CODE_STUB
 #undef DEFINE_HANDLER_CODE_STUB
 #undef DEFINE_HYDROGEN_CODE_STUB
 #undef DEFINE_CODE_STUB
 #undef DEFINE_CODE_STUB_BASE
 
 extern Representation RepresentationFromType(Type* type);
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_