[runtime] Turn ArgumentAccessStub into FastNewSloppyArgumentsStub.

src/compiler/js-create-lowering.cc

 // Copyright 2016 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.
 
 #include "src/compiler/js-create-lowering.h"
 
 #include "src/allocation-site-scopes.h"
 #include "src/code-factory.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/access-builder.h"
@@ skipping 268 matching lines @@
   CreateArgumentsType type = CreateArgumentsTypeOf(node->op());
   Node* const frame_state = NodeProperties::GetFrameStateInput(node, 0);
   Node* const outer_state = frame_state->InputAt(kFrameStateOuterStateInput);
   FrameStateInfo state_info = OpParameter<FrameStateInfo>(frame_state);
 
   // Use the ArgumentsAccessStub for materializing both mapped and unmapped
   // arguments object, but only for non-inlined (i.e. outermost) frames.
   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,
             CallDescriptor::kNeedsFrameState);
         const Operator* new_op = common()->Call(desc);
         Node* stub_code = jsgraph()->HeapConstant(callable.code());
         node->InsertInput(graph()->zone(), 0, stub_code);
         NodeProperties::ChangeOp(node, new_op);
         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,
             CallDescriptor::kNeedsFrameState);
         const Operator* new_op = common()->Call(desc);
         Node* stub_code = jsgraph()->HeapConstant(callable.code());
         node->InsertInput(graph()->zone(), 0, stub_code);
         NodeProperties::ChangeOp(node, new_op);
         return Changed(node);
       }
@@ skipping 758 matching lines @@
   return jsgraph()->simplified();
 }
 
 MachineOperatorBuilder* JSCreateLowering::machine() const {
   return jsgraph()->machine();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8