[turbofan] Introduce JSCreateLowering for optimizing JSCreate nodes.

src/compiler/js-typed-lowering.cc

Index: src/compiler/js-typed-lowering.cc
diff --git a/src/compiler/js-typed-lowering.cc b/src/compiler/js-typed-lowering.cc
index 851b6d69c27ae521ed1cd8a8afec299eacb4b7b9..f0c4b81137b9cdb2cf2503fe6ad86916938f99d6 100644
--- a/src/compiler/js-typed-lowering.cc
+++ b/src/compiler/js-typed-lowering.cc
@@ -11,7 +11,6 @@
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/operator-properties.h"
-#include "src/compiler/state-values-utils.h"
 #include "src/type-cache.h"
 #include "src/types.h"
 
@@ -19,86 +18,6 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
-namespace {
-
-// A helper class to construct inline allocations on the simplified operator
-// level. This keeps track of the effect chain for initial stores on a newly
-// allocated object and also provides helpers for commonly allocated objects.
-class AllocationBuilder final {
- public:
-  AllocationBuilder(JSGraph* jsgraph, Node* effect, Node* control)
-      : jsgraph_(jsgraph),
-        allocation_(nullptr),
-        effect_(effect),
-        control_(control) {}
-
-  // Primitive allocation of static size.
-  void Allocate(int size, PretenureFlag pretenure = NOT_TENURED) {
-    effect_ = graph()->NewNode(common()->BeginRegion(), effect_);
-    allocation_ =
-        graph()->NewNode(simplified()->Allocate(pretenure),
-                         jsgraph()->Constant(size), effect_, control_);
-    effect_ = allocation_;
-  }
-
-  // Primitive store into a field.
-  void Store(const FieldAccess& access, Node* value) {
-    effect_ = graph()->NewNode(simplified()->StoreField(access), allocation_,
-                               value, effect_, control_);
-  }
-
-  // Primitive store into an element.
-  void Store(ElementAccess const& access, Node* index, Node* value) {
-    effect_ = graph()->NewNode(simplified()->StoreElement(access), allocation_,
-                               index, value, effect_, control_);
-  }
-
-  // Compound allocation of a FixedArray.
-  void AllocateArray(int length, Handle<Map> map,
-                     PretenureFlag pretenure = NOT_TENURED) {
-    DCHECK(map->instance_type() == FIXED_ARRAY_TYPE ||
-           map->instance_type() == FIXED_DOUBLE_ARRAY_TYPE);
-    int size = (map->instance_type() == FIXED_ARRAY_TYPE)
-                   ? FixedArray::SizeFor(length)
-                   : FixedDoubleArray::SizeFor(length);
-    Allocate(size, pretenure);
-    Store(AccessBuilder::ForMap(), map);
-    Store(AccessBuilder::ForFixedArrayLength(), jsgraph()->Constant(length));
-  }
-
-  // Compound store of a constant into a field.
-  void Store(const FieldAccess& access, Handle<Object> value) {
-    Store(access, jsgraph()->Constant(value));
-  }
-
-  void FinishAndChange(Node* node) {
-    NodeProperties::SetType(allocation_, NodeProperties::GetType(node));
-    node->ReplaceInput(0, allocation_);
-    node->ReplaceInput(1, effect_);
-    node->TrimInputCount(2);
-    NodeProperties::ChangeOp(node, common()->FinishRegion());
-  }
-
-  Node* Finish() {
-    return graph()->NewNode(common()->FinishRegion(), allocation_, effect_);
-  }
-
- protected:
-  JSGraph* jsgraph() { return jsgraph_; }
-  Graph* graph() { return jsgraph_->graph(); }
-  CommonOperatorBuilder* common() { return jsgraph_->common(); }
-  SimplifiedOperatorBuilder* simplified() { return jsgraph_->simplified(); }
-
- private:
-  JSGraph* const jsgraph_;
-  Node* allocation_;
-  Node* effect_;
-  Node* control_;
-};
-
-}  // namespace
-
-
 // A helper class to simplify the process of reducing a single binop node with a
 // JSOperator. This class manages the rewriting of context, control, and effect
 // dependencies during lowering of a binop and contains numerous helper
@@ -1432,505 +1351,6 @@ Reduction JSTypedLowering::ReduceJSConvertReceiver(Node* node) {
 }
 
 
-namespace {
-
-// Maximum instance size for which allocations will be inlined.
-const int kMaxInlineInstanceSize = 64 * kPointerSize;
-
-
-// Checks whether allocation using the given constructor can be inlined.
-bool IsAllocationInlineable(Handle<JSFunction> constructor) {
-  // TODO(bmeurer): Further relax restrictions on inlining, i.e.
-  // instance type and maybe instance size (inobject properties
-  // are limited anyways by the runtime).
-  return constructor->has_initial_map() &&
-         constructor->initial_map()->instance_type() == JS_OBJECT_TYPE &&
-         constructor->initial_map()->instance_size() < kMaxInlineInstanceSize;
-}
-
-}  // namespace
-
-
-Reduction JSTypedLowering::ReduceJSCreate(Node* node) {
-  DCHECK_EQ(IrOpcode::kJSCreate, node->opcode());
-  Node* const target = NodeProperties::GetValueInput(node, 0);
-  Type* const target_type = NodeProperties::GetType(target);
-  Node* const new_target = NodeProperties::GetValueInput(node, 1);
-  Node* const effect = NodeProperties::GetEffectInput(node);
-  // TODO(turbofan): Add support for NewTarget passed to JSCreate.
-  if (target != new_target) return NoChange();
-  // Extract constructor function.
-  if (target_type->IsConstant() &&
-      target_type->AsConstant()->Value()->IsJSFunction()) {
-    Handle<JSFunction> constructor =
-        Handle<JSFunction>::cast(target_type->AsConstant()->Value());
-    DCHECK(constructor->IsConstructor());
-    // Force completion of inobject slack tracking before
-    // generating code to finalize the instance size.
-    constructor->CompleteInobjectSlackTrackingIfActive();
-
-    // TODO(bmeurer): We fall back to the runtime in case we cannot inline
-    // the allocation here, which is sort of expensive. We should think about
-    // a soft fallback to some NewObjectCodeStub.
-    if (IsAllocationInlineable(constructor)) {
-      // Compute instance size from initial map of {constructor}.
-      Handle<Map> initial_map(constructor->initial_map(), isolate());
-      int const instance_size = initial_map->instance_size();
-
-      // Add a dependency on the {initial_map} to make sure that this code is
-      // deoptimized whenever the {initial_map} of the {constructor} changes.
-      dependencies()->AssumeInitialMapCantChange(initial_map);
-
-      // Emit code to allocate the JSObject instance for the {constructor}.
-      AllocationBuilder a(jsgraph(), effect, graph()->start());
-      a.Allocate(instance_size);
-      a.Store(AccessBuilder::ForMap(), initial_map);
-      a.Store(AccessBuilder::ForJSObjectProperties(),
-              jsgraph()->EmptyFixedArrayConstant());
-      a.Store(AccessBuilder::ForJSObjectElements(),
-              jsgraph()->EmptyFixedArrayConstant());
-      for (int i = 0; i < initial_map->GetInObjectProperties(); ++i) {
-        a.Store(AccessBuilder::ForJSObjectInObjectProperty(initial_map, i),
-                jsgraph()->UndefinedConstant());
-      }
-      a.FinishAndChange(node);
-      return Changed(node);
-    }
-  }
-  return NoChange();
-}
-
-
-namespace {
-
-// Retrieves the frame state holding actual argument values.
-Node* GetArgumentsFrameState(Node* frame_state) {
-  Node* const outer_state = frame_state->InputAt(kFrameStateOuterStateInput);
-  FrameStateInfo outer_state_info = OpParameter<FrameStateInfo>(outer_state);
-  return outer_state_info.type() == FrameStateType::kArgumentsAdaptor
-             ? outer_state
-             : frame_state;
-}
-
-}  // namespace
-
-
-Reduction JSTypedLowering::ReduceJSCreateArguments(Node* node) {
-  DCHECK_EQ(IrOpcode::kJSCreateArguments, node->opcode());
-  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) {
-    if (type != CreateArgumentsType::kRestParameter) {
-      // TODO(bmeurer): Cleanup this mess at some point.
-      Isolate* isolate = jsgraph()->isolate();
-      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();
-      bool unmapped = type == CreateArgumentsType::kUnmappedArguments;
-      Callable callable = CodeFactory::ArgumentsAccess(
-          isolate, unmapped, shared->has_duplicate_parameters());
-      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);
-    } else {
-      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);
-    }
-  } else if (outer_state->opcode() == IrOpcode::kFrameState) {
-    // Use inline allocation for all mapped arguments objects within inlined
-    // (i.e. non-outermost) frames, independent of the object size.
-    if (type == CreateArgumentsType::kMappedArguments) {
-      Handle<SharedFunctionInfo> shared;
-      if (!state_info.shared_info().ToHandle(&shared)) return NoChange();
-      Node* const callee = NodeProperties::GetValueInput(node, 0);
-      Node* const control = NodeProperties::GetControlInput(node);
-      Node* const context = NodeProperties::GetContextInput(node);
-      Node* effect = NodeProperties::GetEffectInput(node);
-      // TODO(mstarzinger): Duplicate parameters are not handled yet.
-      if (shared->has_duplicate_parameters()) return NoChange();
-      // Choose the correct frame state and frame state info depending on
-      // whether there conceptually is an arguments adaptor frame in the call
-      // chain.
-      Node* const args_state = GetArgumentsFrameState(frame_state);
-      FrameStateInfo args_state_info = OpParameter<FrameStateInfo>(args_state);
-      // Prepare element backing store to be used by arguments object.
-      bool has_aliased_arguments = false;
-      Node* const elements = AllocateAliasedArguments(
-          effect, control, args_state, context, shared, &has_aliased_arguments);
-      effect = elements->op()->EffectOutputCount() > 0 ? elements : effect;
-      // Load the arguments object map from the current native context.
-      Node* const load_native_context = effect = graph()->NewNode(
-          javascript()->LoadContext(0, Context::NATIVE_CONTEXT_INDEX, true),
-          context, context, effect);
-      Node* const load_arguments_map = effect = graph()->NewNode(
-          simplified()->LoadField(AccessBuilder::ForContextSlot(
-              has_aliased_arguments ? Context::FAST_ALIASED_ARGUMENTS_MAP_INDEX
-                                    : Context::SLOPPY_ARGUMENTS_MAP_INDEX)),
-          load_native_context, effect, control);
-      // Actually allocate and initialize the arguments object.
-      AllocationBuilder a(jsgraph(), effect, control);
-      Node* properties = jsgraph()->EmptyFixedArrayConstant();
-      int length = args_state_info.parameter_count() - 1;  // Minus receiver.
-      STATIC_ASSERT(Heap::kSloppyArgumentsObjectSize == 5 * kPointerSize);
-      a.Allocate(Heap::kSloppyArgumentsObjectSize);
-      a.Store(AccessBuilder::ForMap(), load_arguments_map);
-      a.Store(AccessBuilder::ForJSObjectProperties(), properties);
-      a.Store(AccessBuilder::ForJSObjectElements(), elements);
-      a.Store(AccessBuilder::ForArgumentsLength(), jsgraph()->Constant(length));
-      a.Store(AccessBuilder::ForArgumentsCallee(), callee);
-      RelaxControls(node);
-      a.FinishAndChange(node);
-      return Changed(node);
-    } else if (type == CreateArgumentsType::kUnmappedArguments) {
-      // Use inline allocation for all unmapped arguments objects within inlined
-      // (i.e. non-outermost) frames, independent of the object size.
-      Node* const control = NodeProperties::GetControlInput(node);
-      Node* const context = NodeProperties::GetContextInput(node);
-      Node* effect = NodeProperties::GetEffectInput(node);
-      // Choose the correct frame state and frame state info depending on
-      // whether there conceptually is an arguments adaptor frame in the call
-      // chain.
-      Node* const args_state = GetArgumentsFrameState(frame_state);
-      FrameStateInfo args_state_info = OpParameter<FrameStateInfo>(args_state);
-      // Prepare element backing store to be used by arguments object.
-      Node* const elements = AllocateArguments(effect, control, args_state);
-      effect = elements->op()->EffectOutputCount() > 0 ? elements : effect;
-      // Load the arguments object map from the current native context.
-      Node* const load_native_context = effect = graph()->NewNode(
-          javascript()->LoadContext(0, Context::NATIVE_CONTEXT_INDEX, true),
-          context, context, effect);
-      Node* const load_arguments_map = effect = graph()->NewNode(
-          simplified()->LoadField(AccessBuilder::ForContextSlot(
-              Context::STRICT_ARGUMENTS_MAP_INDEX)),
-          load_native_context, effect, control);
-      // Actually allocate and initialize the arguments object.
-      AllocationBuilder a(jsgraph(), effect, control);
-      Node* properties = jsgraph()->EmptyFixedArrayConstant();
-      int length = args_state_info.parameter_count() - 1;  // Minus receiver.
-      STATIC_ASSERT(Heap::kStrictArgumentsObjectSize == 4 * kPointerSize);
-      a.Allocate(Heap::kStrictArgumentsObjectSize);
-      a.Store(AccessBuilder::ForMap(), load_arguments_map);
-      a.Store(AccessBuilder::ForJSObjectProperties(), properties);
-      a.Store(AccessBuilder::ForJSObjectElements(), elements);
-      a.Store(AccessBuilder::ForArgumentsLength(), jsgraph()->Constant(length));
-      RelaxControls(node);
-      a.FinishAndChange(node);
-      return Changed(node);
-    } else if (type == CreateArgumentsType::kRestParameter) {
-      Handle<SharedFunctionInfo> shared;
-      if (!state_info.shared_info().ToHandle(&shared)) return NoChange();
-      int start_index = shared->internal_formal_parameter_count();
-      // Use inline allocation for all unmapped arguments objects within inlined
-      // (i.e. non-outermost) frames, independent of the object size.
-      Node* const control = NodeProperties::GetControlInput(node);
-      Node* const context = NodeProperties::GetContextInput(node);
-      Node* effect = NodeProperties::GetEffectInput(node);
-      // Choose the correct frame state and frame state info depending on
-      // whether there conceptually is an arguments adaptor frame in the call
-      // chain.
-      Node* const args_state = GetArgumentsFrameState(frame_state);
-      FrameStateInfo args_state_info = OpParameter<FrameStateInfo>(args_state);
-      // Prepare element backing store to be used by the rest array.
-      Node* const elements =
-          AllocateRestArguments(effect, control, args_state, start_index);
-      effect = elements->op()->EffectOutputCount() > 0 ? elements : effect;
-      // Load the JSArray object map from the current native context.
-      Node* const load_native_context = effect = graph()->NewNode(
-          javascript()->LoadContext(0, Context::NATIVE_CONTEXT_INDEX, true),
-          context, context, effect);
-      Node* const load_jsarray_map = effect = graph()->NewNode(
-          simplified()->LoadField(AccessBuilder::ForContextSlot(
-              Context::JS_ARRAY_FAST_ELEMENTS_MAP_INDEX)),
-          load_native_context, effect, control);
-      // Actually allocate and initialize the jsarray.
-      AllocationBuilder a(jsgraph(), effect, control);
-      Node* properties = jsgraph()->EmptyFixedArrayConstant();
-
-      // -1 to minus receiver
-      int argument_count = args_state_info.parameter_count() - 1;
-      int length = std::max(0, argument_count - start_index);
-      STATIC_ASSERT(JSArray::kSize == 4 * kPointerSize);
-      a.Allocate(JSArray::kSize);
-      a.Store(AccessBuilder::ForMap(), load_jsarray_map);
-      a.Store(AccessBuilder::ForJSObjectProperties(), properties);
-      a.Store(AccessBuilder::ForJSObjectElements(), elements);
-      a.Store(AccessBuilder::ForJSArrayLength(FAST_ELEMENTS),
-              jsgraph()->Constant(length));
-      RelaxControls(node);
-      a.FinishAndChange(node);
-      return Changed(node);
-    }
-  }
-
-  return NoChange();
-}
-
-
-Reduction JSTypedLowering::ReduceNewArray(Node* node, Node* length,
-                                          int capacity,
-                                          Handle<AllocationSite> site) {
-  DCHECK_EQ(IrOpcode::kJSCreateArray, node->opcode());
-  Node* context = NodeProperties::GetContextInput(node);
-  Node* effect = NodeProperties::GetEffectInput(node);
-  Node* control = NodeProperties::GetControlInput(node);
-
-  // Extract transition and tenuring feedback from the {site} and add
-  // appropriate code dependencies on the {site} if deoptimization is
-  // enabled.
-  PretenureFlag pretenure = site->GetPretenureMode();
-  ElementsKind elements_kind = site->GetElementsKind();
-  DCHECK(IsFastElementsKind(elements_kind));
-  if (flags() & kDeoptimizationEnabled) {
-    dependencies()->AssumeTenuringDecision(site);
-    dependencies()->AssumeTransitionStable(site);
-  }
-
-  // Retrieve the initial map for the array from the appropriate native context.
-  Node* native_context = effect = graph()->NewNode(
-      javascript()->LoadContext(0, Context::NATIVE_CONTEXT_INDEX, true),
-      context, context, effect);
-  Node* js_array_map = effect = graph()->NewNode(
-      javascript()->LoadContext(0, Context::ArrayMapIndex(elements_kind), true),
-      native_context, native_context, effect);
-
-  // Setup elements and properties.
-  Node* elements;
-  if (capacity == 0) {
-    elements = jsgraph()->EmptyFixedArrayConstant();
-  } else {
-    elements = effect =
-        AllocateElements(effect, control, elements_kind, capacity, pretenure);
-  }
-  Node* properties = jsgraph()->EmptyFixedArrayConstant();
-
-  // Perform the allocation of the actual JSArray object.
-  AllocationBuilder a(jsgraph(), effect, control);
-  a.Allocate(JSArray::kSize, pretenure);
-  a.Store(AccessBuilder::ForMap(), js_array_map);
-  a.Store(AccessBuilder::ForJSObjectProperties(), properties);
-  a.Store(AccessBuilder::ForJSObjectElements(), elements);
-  a.Store(AccessBuilder::ForJSArrayLength(elements_kind), length);
-  RelaxControls(node);
-  a.FinishAndChange(node);
-  return Changed(node);
-}
-
-
-Reduction JSTypedLowering::ReduceJSCreateArray(Node* node) {
-  DCHECK_EQ(IrOpcode::kJSCreateArray, node->opcode());
-  CreateArrayParameters const& p = CreateArrayParametersOf(node->op());
-  Node* target = NodeProperties::GetValueInput(node, 0);
-  Node* new_target = NodeProperties::GetValueInput(node, 1);
-
-  // TODO(bmeurer): Optimize the subclassing case.
-  if (target != new_target) return NoChange();
-
-  // Check if we have a feedback {site} on the {node}.
-  Handle<AllocationSite> site = p.site();
-  if (p.site().is_null()) return NoChange();
-
-  // Attempt to inline calls to the Array constructor for the relevant cases
-  // where either no arguments are provided, or exactly one unsigned number
-  // argument is given.
-  if (site->CanInlineCall()) {
-    if (p.arity() == 0) {
-      Node* length = jsgraph()->ZeroConstant();
-      int capacity = JSArray::kPreallocatedArrayElements;
-      return ReduceNewArray(node, length, capacity, site);
-    } else if (p.arity() == 1) {
-      Node* length = NodeProperties::GetValueInput(node, 2);
-      Type* length_type = NodeProperties::GetType(length);
-      if (length_type->Is(type_cache_.kElementLoopUnrollType)) {
-        int capacity = static_cast<int>(length_type->Max());
-        return ReduceNewArray(node, length, capacity, site);
-      }
-    }
-  }
-
-  return NoChange();
-}
-
-
-Reduction JSTypedLowering::ReduceJSCreateIterResultObject(Node* node) {
-  DCHECK_EQ(IrOpcode::kJSCreateIterResultObject, node->opcode());
-  Node* value = NodeProperties::GetValueInput(node, 0);
-  Node* done = NodeProperties::GetValueInput(node, 1);
-  Node* context = NodeProperties::GetContextInput(node);
-  Node* effect = NodeProperties::GetEffectInput(node);
-
-  // Load the JSIteratorResult map for the {context}.
-  Node* native_context = effect = graph()->NewNode(
-      javascript()->LoadContext(0, Context::NATIVE_CONTEXT_INDEX, true),
-      context, context, effect);
-  Node* iterator_result_map = effect = graph()->NewNode(
-      javascript()->LoadContext(0, Context::ITERATOR_RESULT_MAP_INDEX, true),
-      native_context, native_context, effect);
-
-  // Emit code to allocate the JSIteratorResult instance.
-  AllocationBuilder a(jsgraph(), effect, graph()->start());
-  a.Allocate(JSIteratorResult::kSize);
-  a.Store(AccessBuilder::ForMap(), iterator_result_map);
-  a.Store(AccessBuilder::ForJSObjectProperties(),
-          jsgraph()->EmptyFixedArrayConstant());
-  a.Store(AccessBuilder::ForJSObjectElements(),
-          jsgraph()->EmptyFixedArrayConstant());
-  a.Store(AccessBuilder::ForJSIteratorResultValue(), value);
-  a.Store(AccessBuilder::ForJSIteratorResultDone(), done);
-  STATIC_ASSERT(JSIteratorResult::kSize == 5 * kPointerSize);
-  a.FinishAndChange(node);
-  return Changed(node);
-}
-
-
-Reduction JSTypedLowering::ReduceJSCreateFunctionContext(Node* node) {
-  DCHECK_EQ(IrOpcode::kJSCreateFunctionContext, node->opcode());
-  int slot_count = OpParameter<int>(node->op());
-  Node* const closure = NodeProperties::GetValueInput(node, 0);
-
-  // Use inline allocation for function contexts up to a size limit.
-  if (slot_count < kFunctionContextAllocationLimit) {
-    // JSCreateFunctionContext[slot_count < limit]](fun)
-    Node* effect = NodeProperties::GetEffectInput(node);
-    Node* control = NodeProperties::GetControlInput(node);
-    Node* context = NodeProperties::GetContextInput(node);
-    Node* extension = jsgraph()->TheHoleConstant();
-    Node* native_context = effect = graph()->NewNode(
-        javascript()->LoadContext(0, Context::NATIVE_CONTEXT_INDEX, true),
-        context, context, effect);
-    AllocationBuilder a(jsgraph(), effect, control);
-    STATIC_ASSERT(Context::MIN_CONTEXT_SLOTS == 4);  // Ensure fully covered.
-    int context_length = slot_count + Context::MIN_CONTEXT_SLOTS;
-    a.AllocateArray(context_length, factory()->function_context_map());
-    a.Store(AccessBuilder::ForContextSlot(Context::CLOSURE_INDEX), closure);
-    a.Store(AccessBuilder::ForContextSlot(Context::PREVIOUS_INDEX), context);
-    a.Store(AccessBuilder::ForContextSlot(Context::EXTENSION_INDEX), extension);
-    a.Store(AccessBuilder::ForContextSlot(Context::NATIVE_CONTEXT_INDEX),
-            native_context);
-    for (int i = Context::MIN_CONTEXT_SLOTS; i < context_length; ++i) {
-      a.Store(AccessBuilder::ForContextSlot(i), jsgraph()->UndefinedConstant());
-    }
-    RelaxControls(node);
-    a.FinishAndChange(node);
-    return Changed(node);
-  }
-
-  return NoChange();
-}
-
-
-Reduction JSTypedLowering::ReduceJSCreateWithContext(Node* node) {
-  DCHECK_EQ(IrOpcode::kJSCreateWithContext, node->opcode());
-  Node* object = NodeProperties::GetValueInput(node, 0);
-  Node* closure = NodeProperties::GetValueInput(node, 1);
-  Node* effect = NodeProperties::GetEffectInput(node);
-  Node* control = NodeProperties::GetControlInput(node);
-  Node* context = NodeProperties::GetContextInput(node);
-  Node* native_context = effect = graph()->NewNode(
-      javascript()->LoadContext(0, Context::NATIVE_CONTEXT_INDEX, true),
-      context, context, effect);
-  AllocationBuilder a(jsgraph(), effect, control);
-  STATIC_ASSERT(Context::MIN_CONTEXT_SLOTS == 4);  // Ensure fully covered.
-  a.AllocateArray(Context::MIN_CONTEXT_SLOTS, factory()->with_context_map());
-  a.Store(AccessBuilder::ForContextSlot(Context::CLOSURE_INDEX), closure);
-  a.Store(AccessBuilder::ForContextSlot(Context::PREVIOUS_INDEX), context);
-  a.Store(AccessBuilder::ForContextSlot(Context::EXTENSION_INDEX), object);
-  a.Store(AccessBuilder::ForContextSlot(Context::NATIVE_CONTEXT_INDEX),
-          native_context);
-  RelaxControls(node);
-  a.FinishAndChange(node);
-  return Changed(node);
-}
-
-
-Reduction JSTypedLowering::ReduceJSCreateCatchContext(Node* node) {
-  DCHECK_EQ(IrOpcode::kJSCreateCatchContext, node->opcode());
-  Handle<String> name = OpParameter<Handle<String>>(node);
-  Node* exception = NodeProperties::GetValueInput(node, 0);
-  Node* closure = NodeProperties::GetValueInput(node, 1);
-  Node* effect = NodeProperties::GetEffectInput(node);
-  Node* control = NodeProperties::GetControlInput(node);
-  Node* context = NodeProperties::GetContextInput(node);
-  Node* native_context = effect = graph()->NewNode(
-      javascript()->LoadContext(0, Context::NATIVE_CONTEXT_INDEX, true),
-      context, context, effect);
-  AllocationBuilder a(jsgraph(), effect, control);
-  STATIC_ASSERT(Context::MIN_CONTEXT_SLOTS == 4);  // Ensure fully covered.
-  a.AllocateArray(Context::MIN_CONTEXT_SLOTS + 1,
-                  factory()->catch_context_map());
-  a.Store(AccessBuilder::ForContextSlot(Context::CLOSURE_INDEX), closure);
-  a.Store(AccessBuilder::ForContextSlot(Context::PREVIOUS_INDEX), context);
-  a.Store(AccessBuilder::ForContextSlot(Context::EXTENSION_INDEX), name);
-  a.Store(AccessBuilder::ForContextSlot(Context::NATIVE_CONTEXT_INDEX),
-          native_context);
-  a.Store(AccessBuilder::ForContextSlot(Context::THROWN_OBJECT_INDEX),
-          exception);
-  RelaxControls(node);
-  a.FinishAndChange(node);
-  return Changed(node);
-}
-
-
-Reduction JSTypedLowering::ReduceJSCreateBlockContext(Node* node) {
-  DCHECK_EQ(IrOpcode::kJSCreateBlockContext, node->opcode());
-  Handle<ScopeInfo> scope_info = OpParameter<Handle<ScopeInfo>>(node);
-  int context_length = scope_info->ContextLength();
-  Node* const closure = NodeProperties::GetValueInput(node, 0);
-
-  // Use inline allocation for block contexts up to a size limit.
-  if (context_length < kBlockContextAllocationLimit) {
-    // JSCreateBlockContext[scope[length < limit]](fun)
-    Node* effect = NodeProperties::GetEffectInput(node);
-    Node* control = NodeProperties::GetControlInput(node);
-    Node* context = NodeProperties::GetContextInput(node);
-    Node* extension = jsgraph()->Constant(scope_info);
-    Node* native_context = effect = graph()->NewNode(
-        javascript()->LoadContext(0, Context::NATIVE_CONTEXT_INDEX, true),
-        context, context, effect);
-    AllocationBuilder a(jsgraph(), effect, control);
-    STATIC_ASSERT(Context::MIN_CONTEXT_SLOTS == 4);  // Ensure fully covered.
-    a.AllocateArray(context_length, factory()->block_context_map());
-    a.Store(AccessBuilder::ForContextSlot(Context::CLOSURE_INDEX), closure);
-    a.Store(AccessBuilder::ForContextSlot(Context::PREVIOUS_INDEX), context);
-    a.Store(AccessBuilder::ForContextSlot(Context::EXTENSION_INDEX), extension);
-    a.Store(AccessBuilder::ForContextSlot(Context::NATIVE_CONTEXT_INDEX),
-            native_context);
-    for (int i = Context::MIN_CONTEXT_SLOTS; i < context_length; ++i) {
-      a.Store(AccessBuilder::ForContextSlot(i), jsgraph()->UndefinedConstant());
-    }
-    RelaxControls(node);
-    a.FinishAndChange(node);
-    return Changed(node);
-  }
-
-  return NoChange();
-}
-
-
 Reduction JSTypedLowering::ReduceJSCallConstruct(Node* node) {
   DCHECK_EQ(IrOpcode::kJSCallConstruct, node->opcode());
   CallConstructParameters const& p = CallConstructParametersOf(node->op());
@@ -2313,22 +1733,6 @@ Reduction JSTypedLowering::Reduce(Node* node) {
       return ReduceJSStoreContext(node);
     case IrOpcode::kJSConvertReceiver:
       return ReduceJSConvertReceiver(node);
-    case IrOpcode::kJSCreate:
-      return ReduceJSCreate(node);
-    case IrOpcode::kJSCreateArguments:
-      return ReduceJSCreateArguments(node);
-    case IrOpcode::kJSCreateArray:
-      return ReduceJSCreateArray(node);
-    case IrOpcode::kJSCreateIterResultObject:
-      return ReduceJSCreateIterResultObject(node);
-    case IrOpcode::kJSCreateFunctionContext:
-      return ReduceJSCreateFunctionContext(node);
-    case IrOpcode::kJSCreateWithContext:
-      return ReduceJSCreateWithContext(node);
-    case IrOpcode::kJSCreateCatchContext:
-      return ReduceJSCreateCatchContext(node);
-    case IrOpcode::kJSCreateBlockContext:
-      return ReduceJSCreateBlockContext(node);
     case IrOpcode::kJSCallConstruct:
       return ReduceJSCallConstruct(node);
     case IrOpcode::kJSCallFunction:
@@ -2355,139 +1759,6 @@ Node* JSTypedLowering::Word32Shl(Node* const lhs, int32_t const rhs) {
 }
 
 
-// Helper that allocates a FixedArray holding argument values recorded in the
-// given {frame_state}. Serves as backing store for JSCreateArguments nodes.
-Node* JSTypedLowering::AllocateArguments(Node* effect, Node* control,
-                                         Node* frame_state) {
-  FrameStateInfo state_info = OpParameter<FrameStateInfo>(frame_state);
-  int argument_count = state_info.parameter_count() - 1;  // Minus receiver.
-  if (argument_count == 0) return jsgraph()->EmptyFixedArrayConstant();
-
-  // Prepare an iterator over argument values recorded in the frame state.
-  Node* const parameters = frame_state->InputAt(kFrameStateParametersInput);
-  StateValuesAccess parameters_access(parameters);
-  auto parameters_it = ++parameters_access.begin();
-
-  // Actually allocate the backing store.
-  AllocationBuilder a(jsgraph(), effect, control);
-  a.AllocateArray(argument_count, factory()->fixed_array_map());
-  for (int i = 0; i < argument_count; ++i, ++parameters_it) {
-    a.Store(AccessBuilder::ForFixedArraySlot(i), (*parameters_it).node);
-  }
-  return a.Finish();
-}
-
-
-// Helper that allocates a FixedArray holding argument values recorded in the
-// given {frame_state}. Serves as backing store for JSCreateArguments nodes.
-Node* JSTypedLowering::AllocateRestArguments(Node* effect, Node* control,
-                                             Node* frame_state,
-                                             int start_index) {
-  FrameStateInfo state_info = OpParameter<FrameStateInfo>(frame_state);
-  int argument_count = state_info.parameter_count() - 1;  // Minus receiver.
-  int num_elements = std::max(0, argument_count - start_index);
-  if (num_elements == 0) return jsgraph()->EmptyFixedArrayConstant();
-
-  // Prepare an iterator over argument values recorded in the frame state.
-  Node* const parameters = frame_state->InputAt(kFrameStateParametersInput);
-  StateValuesAccess parameters_access(parameters);
-  auto parameters_it = ++parameters_access.begin();
-
-  // Skip unused arguments.
-  for (int i = 0; i < start_index; i++) {
-    ++parameters_it;
-  }
-
-  // Actually allocate the backing store.
-  AllocationBuilder a(jsgraph(), effect, control);
-  a.AllocateArray(num_elements, factory()->fixed_array_map());
-  for (int i = 0; i < num_elements; ++i, ++parameters_it) {
-    a.Store(AccessBuilder::ForFixedArraySlot(i), (*parameters_it).node);
-  }
-  return a.Finish();
-}
-
-
-// Helper that allocates a FixedArray serving as a parameter map for values
-// recorded in the given {frame_state}. Some elements map to slots within the
-// given {context}. Serves as backing store for JSCreateArguments nodes.
-Node* JSTypedLowering::AllocateAliasedArguments(
-    Node* effect, Node* control, Node* frame_state, Node* context,
-    Handle<SharedFunctionInfo> shared, bool* has_aliased_arguments) {
-  FrameStateInfo state_info = OpParameter<FrameStateInfo>(frame_state);
-  int argument_count = state_info.parameter_count() - 1;  // Minus receiver.
-  if (argument_count == 0) return jsgraph()->EmptyFixedArrayConstant();
-
-  // If there is no aliasing, the arguments object elements are not special in
-  // any way, we can just return an unmapped backing store instead.
-  int parameter_count = shared->internal_formal_parameter_count();
-  if (parameter_count == 0) {
-    return AllocateArguments(effect, control, frame_state);
-  }
-
-  // Calculate number of argument values being aliased/mapped.
-  int mapped_count = Min(argument_count, parameter_count);
-  *has_aliased_arguments = true;
-
-  // Prepare an iterator over argument values recorded in the frame state.
-  Node* const parameters = frame_state->InputAt(kFrameStateParametersInput);
-  StateValuesAccess parameters_access(parameters);
-  auto paratemers_it = ++parameters_access.begin();
-
-  // The unmapped argument values recorded in the frame state are stored yet
-  // another indirection away and then linked into the parameter map below,
-  // whereas mapped argument values are replaced with a hole instead.
-  AllocationBuilder aa(jsgraph(), effect, control);
-  aa.AllocateArray(argument_count, factory()->fixed_array_map());
-  for (int i = 0; i < mapped_count; ++i, ++paratemers_it) {
-    aa.Store(AccessBuilder::ForFixedArraySlot(i), jsgraph()->TheHoleConstant());
-  }
-  for (int i = mapped_count; i < argument_count; ++i, ++paratemers_it) {
-    aa.Store(AccessBuilder::ForFixedArraySlot(i), (*paratemers_it).node);
-  }
-  Node* arguments = aa.Finish();
-
-  // Actually allocate the backing store.
-  AllocationBuilder a(jsgraph(), arguments, control);
-  a.AllocateArray(mapped_count + 2, factory()->sloppy_arguments_elements_map());
-  a.Store(AccessBuilder::ForFixedArraySlot(0), context);
-  a.Store(AccessBuilder::ForFixedArraySlot(1), arguments);
-  for (int i = 0; i < mapped_count; ++i) {
-    int idx = Context::MIN_CONTEXT_SLOTS + parameter_count - 1 - i;
-    a.Store(AccessBuilder::ForFixedArraySlot(i + 2), jsgraph()->Constant(idx));
-  }
-  return a.Finish();
-}
-
-
-Node* JSTypedLowering::AllocateElements(Node* effect, Node* control,
-                                        ElementsKind elements_kind,
-                                        int capacity, PretenureFlag pretenure) {
-  DCHECK_LE(1, capacity);
-  DCHECK_LE(capacity, JSArray::kInitialMaxFastElementArray);
-
-  Handle<Map> elements_map = IsFastDoubleElementsKind(elements_kind)
-                                 ? factory()->fixed_double_array_map()
-                                 : factory()->fixed_array_map();
-  ElementAccess access = IsFastDoubleElementsKind(elements_kind)
-                             ? AccessBuilder::ForFixedDoubleArrayElement()
-                             : AccessBuilder::ForFixedArrayElement();
-  Node* value =
-      IsFastDoubleElementsKind(elements_kind)
-          ? jsgraph()->Float64Constant(bit_cast<double>(kHoleNanInt64))
-          : jsgraph()->TheHoleConstant();
-
-  // Actually allocate the backing store.
-  AllocationBuilder a(jsgraph(), effect, control);
-  a.AllocateArray(capacity, elements_map, pretenure);
-  for (int i = 0; i < capacity; ++i) {
-    Node* index = jsgraph()->Constant(i);
-    a.Store(access, index, value);
-  }
-  return a.Finish();
-}
-
-
 Factory* JSTypedLowering::factory() const { return jsgraph()->factory(); }