[runtime] Turn ArgumentAccessStub into FastNewSloppyArgumentsStub.

Turn the fast case of ArgumentsAccessStub into a new stub
FastNewSloppyArgumentsStub, which is similar to the existing
FastNewStrictArgumentsStub, although not polished yet, and the slow
case always went to the runtime anyway, so we can just directly emit
a runtime call there.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1695633003

Cr-Commit-Position: refs/heads/master@{#33973}

src/arm/interface-descriptors-arm.cc

@@ -56,11 +56,6 @@ const Register StringCompareDescriptor::LeftRegister() { return r1; }
 const Register StringCompareDescriptor::RightRegister() { return r0; }
 
 
-const Register ArgumentsAccessNewDescriptor::function() { return r1; }
-const Register ArgumentsAccessNewDescriptor::parameter_count() { return r2; }
-const Register ArgumentsAccessNewDescriptor::parameter_pointer() { return r3; }
-
-
 const Register ApiGetterDescriptor::function_address() { return r2; }
 
 
@@ -97,6 +92,13 @@ void FastNewRestParameterDescriptor::InitializePlatformSpecific(
 }
 
 
+void FastNewSloppyArgumentsDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {r1};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
+
 void FastNewStrictArgumentsDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {r1};

src/arm64/interface-descriptors-arm64.cc

@@ -56,11 +56,6 @@ const Register StringCompareDescriptor::LeftRegister() { return x1; }
 const Register StringCompareDescriptor::RightRegister() { return x0; }
 
 
-const Register ArgumentsAccessNewDescriptor::function() { return x1; }
-const Register ArgumentsAccessNewDescriptor::parameter_count() { return x2; }
-const Register ArgumentsAccessNewDescriptor::parameter_pointer() { return x3; }
-
-
 const Register ApiGetterDescriptor::function_address() { return x2; }
 
 
@@ -98,6 +93,14 @@ void FastNewRestParameterDescriptor::InitializePlatformSpecific(
 }
 
 
+void FastNewSloppyArgumentsDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  // x1: function
+  Register registers[] = {x1};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
+
 void FastNewStrictArgumentsDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // x1: function

src/code-factory.cc

@@ -287,18 +287,15 @@ Callable CodeFactory::FastNewRestParameter(Isolate* isolate) {
 
 
 // static
-Callable CodeFactory::FastNewStrictArguments(Isolate* isolate) {
-  FastNewStrictArgumentsStub stub(isolate);
+Callable CodeFactory::FastNewSloppyArguments(Isolate* isolate) {
+  FastNewSloppyArgumentsStub stub(isolate);
   return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
 }
 
 
 // static
-Callable CodeFactory::ArgumentsAccess(Isolate* isolate,
-                                      bool has_duplicate_parameters) {
-  ArgumentsAccessStub::Type type =
-      ArgumentsAccessStub::ComputeType(has_duplicate_parameters);
-  ArgumentsAccessStub stub(isolate, type);
+Callable CodeFactory::FastNewStrictArguments(Isolate* isolate) {
+  FastNewStrictArgumentsStub stub(isolate);
   return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
 }
 

src/code-factory.h

@@ -95,11 +95,9 @@ class CodeFactory final {
   static Callable FastNewClosure(Isolate* isolate, LanguageMode language_mode,
                                  FunctionKind kind);
   static Callable FastNewRestParameter(Isolate* isolate);
+  static Callable FastNewSloppyArguments(Isolate* isolate);
   static Callable FastNewStrictArguments(Isolate* isolate);
 
-  static Callable ArgumentsAccess(Isolate* isolate,
-                                  bool has_duplicate_parameters);
-
   static Callable AllocateHeapNumber(Isolate* isolate);
   static Callable AllocateMutableHeapNumber(Isolate* isolate);
   static Callable AllocateInNewSpace(Isolate* isolate);

src/code-stubs.cc

@@ -820,32 +820,6 @@ void StoreFastElementStub::GenerateAheadOfTime(Isolate* isolate) {
 }
 
 
-void ArgumentsAccessStub::Generate(MacroAssembler* masm) {
-  switch (type()) {
-    case NEW_SLOPPY_FAST:
-      GenerateNewSloppyFast(masm);
-      break;
-    case NEW_SLOPPY_SLOW:
-      GenerateNewSloppySlow(masm);
-      break;
-  }
-}
-
-
-void ArgumentsAccessStub::PrintName(std::ostream& os) const {  // NOLINT
-  os << "ArgumentsAccessStub_";
-  switch (type()) {
-    case NEW_SLOPPY_FAST:
-      os << "NewSloppyFast";
-      break;
-    case NEW_SLOPPY_SLOW:
-      os << "NewSloppySlow";
-      break;
-  }
-  return;
-}
-
-
 void ArrayConstructorStub::PrintName(std::ostream& os) const {  // NOLINT
   os << "ArrayConstructorStub";
   switch (argument_count()) {

src/code-stubs.h

@@ -21,7 +21,6 @@ namespace internal {
 // List of code stubs used on all platforms.
 #define CODE_STUB_LIST_ALL_PLATFORMS(V)     \
   /* PlatformCodeStubs */                   \
-  V(ArgumentsAccess)                        \
   V(ArrayConstructor)                       \
   V(BinaryOpICWithAllocationSite)           \
   V(CallApiFunction)                        \
@@ -78,7 +77,8 @@ namespace internal {
   V(FastNewClosure)                         \
   V(FastNewContext)                         \
   V(FastNewRestParameter)                   \
-  V(FastNewStrictArguments)               \
+  V(FastNewSloppyArguments)                 \
+  V(FastNewStrictArguments)                 \
   V(GrowArrayElements)                      \
   V(InternalArrayNArgumentsConstructor)     \
   V(InternalArrayNoArgumentConstructor)     \
@@ -742,8 +742,20 @@ class FastNewRestParameterStub final : public PlatformCodeStub {
 
 // TODO(turbofan): This stub should be possible to write in TurboFan
 // using the CodeStubAssembler very soon in a way that is as efficient
-// and easy as the current handwritten version, which is partly a copy
-// of the strict arguments object materialization code.
+// and easy as the current handwritten version.
+class FastNewSloppyArgumentsStub final : public PlatformCodeStub {
+ public:
+  explicit FastNewSloppyArgumentsStub(Isolate* isolate)
+      : PlatformCodeStub(isolate) {}
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(FastNewSloppyArguments);
+  DEFINE_PLATFORM_CODE_STUB(FastNewSloppyArguments, PlatformCodeStub);
+};
+
+
+// TODO(turbofan): This stub should be possible to write in TurboFan
+// using the CodeStubAssembler very soon in a way that is as efficient
+// and easy as the current handwritten version.
 class FastNewStrictArgumentsStub final : public PlatformCodeStub {
  public:
   explicit FastNewStrictArgumentsStub(Isolate* isolate)
@@ -1840,43 +1852,6 @@ class JSEntryStub : public PlatformCodeStub {
 };
 
 
-class ArgumentsAccessStub: public PlatformCodeStub {
- public:
-  enum Type {
-    NEW_SLOPPY_FAST,
-    NEW_SLOPPY_SLOW,
-  };
-
-  ArgumentsAccessStub(Isolate* isolate, Type type) : PlatformCodeStub(isolate) {
-    minor_key_ = TypeBits::encode(type);
-  }
-
-  CallInterfaceDescriptor GetCallInterfaceDescriptor() const override {
-    return ArgumentsAccessNewDescriptor(isolate());
-  }
-
-  static Type ComputeType(bool has_duplicate_parameters) {
-    if (has_duplicate_parameters) {
-      return Type::NEW_SLOPPY_SLOW;
-    } else {
-      return Type::NEW_SLOPPY_FAST;
-    }
-  }
-
- private:
-  Type type() const { return TypeBits::decode(minor_key_); }
-
-  void GenerateNewSloppyFast(MacroAssembler* masm);
-  void GenerateNewSloppySlow(MacroAssembler* masm);
-
-  void PrintName(std::ostream& os) const override;  // NOLINT
-
-  class TypeBits : public BitField<Type, 0, 1> {};
-
-  DEFINE_PLATFORM_CODE_STUB(ArgumentsAccess, PlatformCodeStub);
-};
-
-
 class RegExpExecStub: public PlatformCodeStub {
  public:
   explicit RegExpExecStub(Isolate* isolate) : PlatformCodeStub(isolate) { }

src/compiler/js-create-lowering.cc

@@ -286,31 +286,25 @@ Reduction JSCreateLowering::ReduceJSCreateArguments(Node* node) {
   if (outer_state->opcode() != IrOpcode::kFrameState) {
     switch (type) {
       case CreateArgumentsType::kMappedArguments: {
-        // TODO(bmeurer): Cleanup this mess at some point.
-        int parameter_count = state_info.parameter_count() - 1;
-        int parameter_offset = parameter_count * kPointerSize;
-        int offset = StandardFrameConstants::kCallerSPOffset + parameter_offset;
-        Node* parameter_pointer =
-            graph()->NewNode(machine()->IntAdd(),
-                             graph()->NewNode(machine()->LoadFramePointer()),
-                             jsgraph()->IntPtrConstant(offset));
-        Handle<SharedFunctionInfo> shared;
-        if (!state_info.shared_info().ToHandle(&shared)) return NoChange();
-        Callable callable = CodeFactory::ArgumentsAccess(
-            isolate(), shared->has_duplicate_parameters());
+        // TODO(mstarzinger): Duplicate parameters are not handled yet.
+        Handle<SharedFunctionInfo> shared_info;
+        if (!state_info.shared_info().ToHandle(&shared_info) ||
+            shared_info->has_duplicate_parameters()) {
+          return NoChange();
+        }
+        // TODO(bmeurer): Actually we don't need a frame state here.
+        Callable callable = CodeFactory::FastNewSloppyArguments(isolate());
         CallDescriptor* desc = Linkage::GetStubCallDescriptor(
             isolate(), graph()->zone(), callable.descriptor(), 0,
             CallDescriptor::kNeedsFrameState);
         const Operator* new_op = common()->Call(desc);
         Node* stub_code = jsgraph()->HeapConstant(callable.code());
         node->InsertInput(graph()->zone(), 0, stub_code);
-        node->InsertInput(graph()->zone(), 2,
-                          jsgraph()->Constant(parameter_count));
-        node->InsertInput(graph()->zone(), 3, parameter_pointer);
         NodeProperties::ChangeOp(node, new_op);
         return Changed(node);
       }
       case CreateArgumentsType::kUnmappedArguments: {
+        // TODO(bmeurer): Actually we don't need a frame state here.
         Callable callable = CodeFactory::FastNewStrictArguments(isolate());
         CallDescriptor* desc = Linkage::GetStubCallDescriptor(
             isolate(), graph()->zone(), callable.descriptor(), 0,
@@ -322,6 +316,7 @@ Reduction JSCreateLowering::ReduceJSCreateArguments(Node* node) {
         return Changed(node);
       }
       case CreateArgumentsType::kRestParameter: {
+        // TODO(bmeurer): Actually we don't need a frame state here.
         Callable callable = CodeFactory::FastNewRestParameter(isolate());
         CallDescriptor* desc = Linkage::GetStubCallDescriptor(
             isolate(), graph()->zone(), callable.descriptor(), 0,

src/full-codegen/arm/full-codegen-arm.cc

@@ -277,23 +277,11 @@ void FullCodeGenerator::Generate() {
     if (is_strict(language_mode()) || !has_simple_parameters()) {
       FastNewStrictArgumentsStub stub(isolate());
       __ CallStub(&stub);
+    } else if (literal()->has_duplicate_parameters()) {
+      __ Push(r1);
+      __ CallRuntime(Runtime::kNewSloppyArguments_Generic);
     } else {
-      DCHECK(r1.is(ArgumentsAccessNewDescriptor::function()));
-      // Receiver is just before the parameters on the caller's stack.
-      int num_parameters = info->scope()->num_parameters();
-      int offset = num_parameters * kPointerSize;
-      __ mov(ArgumentsAccessNewDescriptor::parameter_count(),
-             Operand(Smi::FromInt(num_parameters)));
-      __ add(ArgumentsAccessNewDescriptor::parameter_pointer(), fp,
-             Operand(StandardFrameConstants::kCallerSPOffset + offset));
-
-      // Arguments to ArgumentsAccessStub:
-      //   function, parameter pointer, parameter count.
-      // The stub will rewrite parameter pointer and parameter count if the
-      // previous stack frame was an arguments adapter frame.
-      ArgumentsAccessStub::Type type = ArgumentsAccessStub::ComputeType(
-          literal()->has_duplicate_parameters());
-      ArgumentsAccessStub stub(isolate(), type);
+      FastNewSloppyArgumentsStub stub(isolate());
       __ CallStub(&stub);
     }
 

src/full-codegen/arm64/full-codegen-arm64.cc

@@ -281,23 +281,11 @@ void FullCodeGenerator::Generate() {
     if (is_strict(language_mode()) || !has_simple_parameters()) {
       FastNewStrictArgumentsStub stub(isolate());
       __ CallStub(&stub);
+    } else if (literal()->has_duplicate_parameters()) {
+      __ Push(x1);
+      __ CallRuntime(Runtime::kNewSloppyArguments_Generic);
     } else {
-      DCHECK(x1.is(ArgumentsAccessNewDescriptor::function()));
-      // Receiver is just before the parameters on the caller's stack.
-      int num_parameters = info->scope()->num_parameters();
-      int offset = num_parameters * kPointerSize;
-      __ Mov(ArgumentsAccessNewDescriptor::parameter_count(),
-             Smi::FromInt(num_parameters));
-      __ Add(ArgumentsAccessNewDescriptor::parameter_pointer(), fp,
-             StandardFrameConstants::kCallerSPOffset + offset);
-
-      // Arguments to ArgumentsAccessStub:
-      //   function, parameter pointer, parameter count.
-      // The stub will rewrite parameter pointer and parameter count if the
-      // previous stack frame was an arguments adapter frame.
-      ArgumentsAccessStub::Type type = ArgumentsAccessStub::ComputeType(
-          literal()->has_duplicate_parameters());
-      ArgumentsAccessStub stub(isolate(), type);
+      FastNewSloppyArgumentsStub stub(isolate());
       __ CallStub(&stub);
     }
 

src/full-codegen/ia32/full-codegen-ia32.cc

@@ -272,23 +272,11 @@ void FullCodeGenerator::Generate() {
     if (is_strict(language_mode()) || !has_simple_parameters()) {
       FastNewStrictArgumentsStub stub(isolate());
       __ CallStub(&stub);
+    } else if (literal()->has_duplicate_parameters()) {
+      __ Push(edi);
+      __ CallRuntime(Runtime::kNewSloppyArguments_Generic);
     } else {
-      DCHECK(edi.is(ArgumentsAccessNewDescriptor::function()));
-      // Receiver is just before the parameters on the caller's stack.
-      int num_parameters = info->scope()->num_parameters();
-      int offset = num_parameters * kPointerSize;
-      __ mov(ArgumentsAccessNewDescriptor::parameter_count(),
-             Immediate(Smi::FromInt(num_parameters)));
-      __ lea(ArgumentsAccessNewDescriptor::parameter_pointer(),
-             Operand(ebp, StandardFrameConstants::kCallerSPOffset + offset));
-
-      // Arguments to ArgumentsAccessStub:
-      //   function, parameter pointer, parameter count.
-      // The stub will rewrite parameter pointer and parameter count if the
-      // previous stack frame was an arguments adapter frame.
-      ArgumentsAccessStub::Type type = ArgumentsAccessStub::ComputeType(
-          literal()->has_duplicate_parameters());
-      ArgumentsAccessStub stub(isolate(), type);
+      FastNewSloppyArgumentsStub stub(isolate());
       __ CallStub(&stub);
     }
 

src/full-codegen/mips/full-codegen-mips.cc

@@ -287,23 +287,11 @@ void FullCodeGenerator::Generate() {
     if (is_strict(language_mode()) || !has_simple_parameters()) {
       FastNewStrictArgumentsStub stub(isolate());
       __ CallStub(&stub);
+    } else if (literal()->has_duplicate_parameters()) {
+      __ Push(a1);
+      __ CallRuntime(Runtime::kNewSloppyArguments_Generic);
     } else {
-      DCHECK(a1.is(ArgumentsAccessNewDescriptor::function()));
-      // Receiver is just before the parameters on the caller's stack.
-      int num_parameters = info->scope()->num_parameters();
-      int offset = num_parameters * kPointerSize;
-      __ li(ArgumentsAccessNewDescriptor::parameter_count(),
-            Operand(Smi::FromInt(num_parameters)));
-      __ Addu(ArgumentsAccessNewDescriptor::parameter_pointer(), fp,
-              Operand(StandardFrameConstants::kCallerSPOffset + offset));
-
-      // Arguments to ArgumentsAccessStub:
-      //   function, parameter pointer, parameter count.
-      // The stub will rewrite parameter pointer and parameter count if the
-      // previous stack frame was an arguments adapter frame.
-      ArgumentsAccessStub::Type type = ArgumentsAccessStub::ComputeType(
-          literal()->has_duplicate_parameters());
-      ArgumentsAccessStub stub(isolate(), type);
+      FastNewSloppyArgumentsStub stub(isolate());
       __ CallStub(&stub);
     }
 

src/full-codegen/mips64/full-codegen-mips64.cc

@@ -285,23 +285,11 @@ void FullCodeGenerator::Generate() {
     if (is_strict(language_mode()) || !has_simple_parameters()) {
       FastNewStrictArgumentsStub stub(isolate());
       __ CallStub(&stub);
+    } else if (literal()->has_duplicate_parameters()) {
+      __ Push(a1);
+      __ CallRuntime(Runtime::kNewSloppyArguments_Generic);
     } else {
-      DCHECK(a1.is(ArgumentsAccessNewDescriptor::function()));
-      // Receiver is just before the parameters on the caller's stack.
-      int num_parameters = info->scope()->num_parameters();
-      int offset = num_parameters * kPointerSize;
-      __ li(ArgumentsAccessNewDescriptor::parameter_count(),
-            Operand(Smi::FromInt(num_parameters)));
-      __ Daddu(ArgumentsAccessNewDescriptor::parameter_pointer(), fp,
-               Operand(StandardFrameConstants::kCallerSPOffset + offset));
-
-      // Arguments to ArgumentsAccessStub:
-      //   function, parameter pointer, parameter count.
-      // The stub will rewrite parameter pointer and parameter count if the
-      // previous stack frame was an arguments adapter frame.
-      ArgumentsAccessStub::Type type = ArgumentsAccessStub::ComputeType(
-          literal()->has_duplicate_parameters());
-      ArgumentsAccessStub stub(isolate(), type);
+      FastNewSloppyArgumentsStub stub(isolate());
       __ CallStub(&stub);
     }
 

src/full-codegen/x64/full-codegen-x64.cc

@@ -268,23 +268,11 @@ void FullCodeGenerator::Generate() {
     if (is_strict(language_mode()) || !has_simple_parameters()) {
       FastNewStrictArgumentsStub stub(isolate());
       __ CallStub(&stub);
+    } else if (literal()->has_duplicate_parameters()) {
+      __ Push(rdi);
+      __ CallRuntime(Runtime::kNewSloppyArguments_Generic);
     } else {
-      DCHECK(rdi.is(ArgumentsAccessNewDescriptor::function()));
-      // The receiver is just before the parameters on the caller's stack.
-      int num_parameters = info->scope()->num_parameters();
-      int offset = num_parameters * kPointerSize;
-      __ Move(ArgumentsAccessNewDescriptor::parameter_count(),
-              Smi::FromInt(num_parameters));
-      __ leap(ArgumentsAccessNewDescriptor::parameter_pointer(),
-              Operand(rbp, StandardFrameConstants::kCallerSPOffset + offset));
-
-      // Arguments to ArgumentsAccessStub:
-      //   function, parameter pointer, parameter count.
-      // The stub will rewrite parameter pointer and parameter count if the
-      // previous stack frame was an arguments adapter frame.
-      ArgumentsAccessStub::Type type = ArgumentsAccessStub::ComputeType(
-          literal()->has_duplicate_parameters());
-      ArgumentsAccessStub stub(isolate(), type);
+      FastNewSloppyArgumentsStub stub(isolate());
       __ CallStub(&stub);
     }
 

src/ia32/interface-descriptors-ia32.cc

@@ -59,11 +59,6 @@ const Register StringCompareDescriptor::LeftRegister() { return edx; }
 const Register StringCompareDescriptor::RightRegister() { return eax; }
 
 
-const Register ArgumentsAccessNewDescriptor::function() { return edi; }
-const Register ArgumentsAccessNewDescriptor::parameter_count() { return ecx; }
-const Register ArgumentsAccessNewDescriptor::parameter_pointer() { return edx; }
-
-
 const Register ApiGetterDescriptor::function_address() { return edx; }
 
 
@@ -100,6 +95,13 @@ void FastNewRestParameterDescriptor::InitializePlatformSpecific(
 }
 
 
+void FastNewSloppyArgumentsDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {edi};
+  data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
+}
+
+
 void FastNewStrictArgumentsDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {edi};

src/interface-descriptors.cc

@@ -339,25 +339,6 @@ void ApiGetterDescriptor::InitializePlatformSpecific(
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
-FunctionType*
-ArgumentsAccessNewDescriptor::BuildCallInterfaceDescriptorFunctionType(
-    Isolate* isolate, int paramater_count) {
-  Zone* zone = isolate->interface_descriptor_zone();
-  FunctionType* function =
-      Type::Function(AnyTagged(zone), Type::Undefined(), 3, zone)->AsFunction();
-  function->InitParameter(0, AnyTagged(zone));
-  function->InitParameter(1, SmiType(zone));
-  function->InitParameter(2, ExternalPointer(zone));
-  return function;
-}
-
-
-void ArgumentsAccessNewDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {function(), parameter_count(), parameter_pointer()};
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
 
 void ContextOnlyDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {

src/interface-descriptors.h

@@ -26,7 +26,8 @@ class PlatformInterfaceDescriptor;
   V(FastNewClosure)                           \
   V(FastNewContext)                           \
   V(FastNewRestParameter)                     \
-  V(FastNewStrictArguments)                 \
+  V(FastNewSloppyArguments)                   \
+  V(FastNewStrictArguments)                   \
   V(ToNumber)                                 \
   V(ToLength)                                 \
   V(ToString)                                 \
@@ -69,7 +70,6 @@ class PlatformInterfaceDescriptor;
   V(ApiFunction)                              \
   V(ApiAccessor)                              \
   V(ApiGetter)                                \
-  V(ArgumentsAccessNew)                       \
   V(LoadGlobalViaContext)                     \
   V(StoreGlobalViaContext)                    \
   V(MathPowTagged)                            \
@@ -379,6 +379,12 @@ class FastNewRestParameterDescriptor : public CallInterfaceDescriptor {
   DECLARE_DESCRIPTOR(FastNewRestParameterDescriptor, CallInterfaceDescriptor)
 };
 
+class FastNewSloppyArgumentsDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(FastNewSloppyArgumentsDescriptor,
+                     CallInterfaceDescriptor)
+};
+
 class FastNewStrictArgumentsDescriptor : public CallInterfaceDescriptor {
  public:
   DECLARE_DESCRIPTOR(FastNewStrictArgumentsDescriptor,
@@ -708,17 +714,6 @@ class ApiGetterDescriptor : public CallInterfaceDescriptor {
 };
 
 
-class ArgumentsAccessNewDescriptor : public CallInterfaceDescriptor {
- public:
-  DECLARE_DESCRIPTOR_WITH_CUSTOM_FUNCTION_TYPE(ArgumentsAccessNewDescriptor,
-                                               CallInterfaceDescriptor)
-
-  static const Register function();
-  static const Register parameter_count();
-  static const Register parameter_pointer();
-};
-
-
 class MathPowTaggedDescriptor : public CallInterfaceDescriptor {
  public:
   DECLARE_DESCRIPTOR(MathPowTaggedDescriptor, CallInterfaceDescriptor)

src/mips/interface-descriptors-mips.cc

@@ -54,11 +54,6 @@ const Register StringCompareDescriptor::LeftRegister() { return a1; }
 const Register StringCompareDescriptor::RightRegister() { return a0; }
 
 
-const Register ArgumentsAccessNewDescriptor::function() { return a1; }
-const Register ArgumentsAccessNewDescriptor::parameter_count() { return a2; }
-const Register ArgumentsAccessNewDescriptor::parameter_pointer() { return a3; }
-
-
 const Register ApiGetterDescriptor::function_address() { return a2; }
 
 
@@ -95,6 +90,13 @@ void FastNewRestParameterDescriptor::InitializePlatformSpecific(
 }
 
 
+void FastNewSloppyArgumentsDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {a1};
+  data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
+}
+
+
 void FastNewStrictArgumentsDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {a1};

src/mips64/interface-descriptors-mips64.cc

@@ -54,11 +54,6 @@ const Register StringCompareDescriptor::LeftRegister() { return a1; }
 const Register StringCompareDescriptor::RightRegister() { return a0; }
 
 
-const Register ArgumentsAccessNewDescriptor::function() { return a1; }
-const Register ArgumentsAccessNewDescriptor::parameter_count() { return a2; }
-const Register ArgumentsAccessNewDescriptor::parameter_pointer() { return a3; }
-
-
 const Register ApiGetterDescriptor::function_address() { return a2; }
 
 
@@ -95,6 +90,13 @@ void FastNewRestParameterDescriptor::InitializePlatformSpecific(
 }
 
 
+void FastNewSloppyArgumentsDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {a1};
+  data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
+}
+
+
 void FastNewStrictArgumentsDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {a1};

src/x64/interface-descriptors-x64.cc

@@ -54,11 +54,6 @@ const Register StringCompareDescriptor::LeftRegister() { return rdx; }
 const Register StringCompareDescriptor::RightRegister() { return rax; }
 
 
-const Register ArgumentsAccessNewDescriptor::function() { return rdi; }
-const Register ArgumentsAccessNewDescriptor::parameter_count() { return rcx; }
-const Register ArgumentsAccessNewDescriptor::parameter_pointer() { return rdx; }
-
-
 const Register ApiGetterDescriptor::function_address() { return r8; }
 
 
@@ -94,6 +89,12 @@ void FastNewRestParameterDescriptor::InitializePlatformSpecific(
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
+void FastNewSloppyArgumentsDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {rdi};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
 void FastNewStrictArgumentsDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {rdi};