Move FastAccessorAssembler from RawMachineAssembler to CodeStubAssembler.

src/fast-accessor-assembler.cc

 // Copyright 2015 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/fast-accessor-assembler.h"
+#include "src/fast-accessor-assembler.h"
 
 #include "src/base/logging.h"
 #include "src/code-stubs.h"  // For CallApiCallbackStub.
-#include "src/compiler/graph.h"
-#include "src/compiler/linkage.h"
-#include "src/compiler/pipeline.h"
-#include "src/compiler/raw-machine-assembler.h"
-#include "src/compiler/schedule.h"
-#include "src/compiler/verifier.h"
+#include "src/compiler/code-stub-assembler.h"
 #include "src/handles-inl.h"
-#include "src/objects.h"  // For FAA::GetInternalField impl.
+#include "src/objects.h"  // For FAA::LoadInternalField impl.
+
+using v8::internal::compiler::CodeStubAssembler;
+using v8::internal::compiler::Node;
 
 namespace v8 {
 namespace internal {
-namespace compiler {
 
 FastAccessorAssembler::FastAccessorAssembler(Isolate* isolate)
     : zone_(),
-      assembler_(new RawMachineAssembler(
-          isolate, new (zone()) Graph(zone()),
-          Linkage::GetJSCallDescriptor(&zone_, false, 1,
-                                       CallDescriptor::kNoFlags))),
+      isolate_(isolate),
+      assembler_(new CodeStubAssembler(isolate, zone(), 1,
+                                       Code::ComputeFlags(Code::STUB),
+                                       "FastAccessorAssembler")),
       state_(kBuilding) {}
 
-
-FastAccessorAssembler::~FastAccessorAssembler() {}
-
+FastAccessorAssembler::~FastAccessorAssembler() { Clear(); }
 
 FastAccessorAssembler::ValueId FastAccessorAssembler::IntegerConstant(
     int const_value) {
   CHECK_EQ(kBuilding, state_);
   return FromRaw(assembler_->NumberConstant(const_value));
 }
 
-
 FastAccessorAssembler::ValueId FastAccessorAssembler::GetReceiver() {
   CHECK_EQ(kBuilding, state_);
 
-  // For JS call descriptor, the receiver is parameter 0. If we use other
-  // call descriptors, this may or may not hold. So let's check.
-  CHECK(assembler_->call_descriptor()->IsJSFunctionCall());
+  // For JS functions, the receiver is parameter 0.
   return FromRaw(assembler_->Parameter(0));
 }
 
-
 FastAccessorAssembler::ValueId FastAccessorAssembler::LoadInternalField(
     ValueId value, int field_no) {
   CHECK_EQ(kBuilding, state_);
+
   // Determine the 'value' object's instance type.
-  Node* object_map =
-      assembler_->Load(MachineType::Pointer(), FromId(value),
-                       assembler_->IntPtrConstant(
-                           Internals::kHeapObjectMapOffset - kHeapObjectTag));
+  Node* object_map = assembler_->LoadObjectField(
+      FromId(value), Internals::kHeapObjectMapOffset, MachineType::Pointer());
   Node* instance_type = assembler_->WordAnd(
-      assembler_->Load(
-          MachineType::Uint16(), object_map,
-          assembler_->IntPtrConstant(
-              Internals::kMapInstanceTypeAndBitFieldOffset - kHeapObjectTag)),
+      assembler_->LoadObjectField(object_map,
+                                  Internals::kMapInstanceTypeAndBitFieldOffset,
+                                  MachineType::Uint16()),
       assembler_->IntPtrConstant(0xff));
 
   // Check whether we have a proper JSObject.
-  RawMachineLabel is_jsobject, is_not_jsobject, merge;
+  CodeStubAssembler::Variable result(assembler_.get(),
+                                     MachineRepresentation::kTagged);
+  CodeStubAssembler::Label is_jsobject(assembler_.get());
+  CodeStubAssembler::Label is_not_jsobject(assembler_.get());
+  CodeStubAssembler::Label merge(assembler_.get(), &result);
   assembler_->Branch(
       assembler_->WordEqual(
           instance_type, assembler_->IntPtrConstant(Internals::kJSObjectType)),
       &is_jsobject, &is_not_jsobject);
 
   // JSObject? Then load the internal field field_no.
   assembler_->Bind(&is_jsobject);
-  Node* internal_field = assembler_->Load(
-      MachineType::Pointer(), FromId(value),
-      assembler_->IntPtrConstant(JSObject::kHeaderSize - kHeapObjectTag +
-                                 kPointerSize * field_no));
+  Node* internal_field = assembler_->LoadObjectField(
+      FromId(value), JSObject::kHeaderSize + kPointerSize * field_no,
+      MachineType::Pointer());
+  result.Bind(internal_field);
   assembler_->Goto(&merge);
 
   // No JSObject? Return undefined.
   // TODO(vogelheim): Check whether this is the appropriate action, or whether
   //                  the method should take a label instead.
   assembler_->Bind(&is_not_jsobject);
   Node* fail_value = assembler_->UndefinedConstant();
+  result.Bind(fail_value);
   assembler_->Goto(&merge);
 
   // Return.
   assembler_->Bind(&merge);
-  Node* phi = assembler_->Phi(MachineRepresentation::kTagged, internal_field,
-                              fail_value);
-  return FromRaw(phi);
+  return FromRaw(result.value());
 }
 
-
 FastAccessorAssembler::ValueId FastAccessorAssembler::LoadValue(ValueId value,
                                                                 int offset) {
   CHECK_EQ(kBuilding, state_);
-  return FromRaw(assembler_->Load(MachineType::IntPtr(), FromId(value),
-                                  assembler_->IntPtrConstant(offset)));
+  return FromRaw(assembler_->LoadBufferObject(FromId(value), offset,
+                                              MachineType::IntPtr()));
 }
 
-
 FastAccessorAssembler::ValueId FastAccessorAssembler::LoadObject(ValueId value,
                                                                  int offset) {
   CHECK_EQ(kBuilding, state_);
-  return FromRaw(
-      assembler_->Load(MachineType::AnyTagged(),
-                       assembler_->Load(MachineType::Pointer(), FromId(value),
-                                        assembler_->IntPtrConstant(offset))));
+  return FromRaw(assembler_->LoadBufferObject(
+      assembler_->LoadBufferObject(FromId(value), offset,
+                                   MachineType::Pointer()),
+      0, MachineType::AnyTagged()));
 }
 
-
 void FastAccessorAssembler::ReturnValue(ValueId value) {
   CHECK_EQ(kBuilding, state_);
   assembler_->Return(FromId(value));
 }
 
-
 void FastAccessorAssembler::CheckFlagSetOrReturnNull(ValueId value, int mask) {
   CHECK_EQ(kBuilding, state_);
-  RawMachineLabel pass, fail;
+  CodeStubAssembler::Label pass(assembler_.get());
+  CodeStubAssembler::Label fail(assembler_.get());
   assembler_->Branch(
       assembler_->Word32Equal(
           assembler_->Word32And(FromId(value), assembler_->Int32Constant(mask)),
           assembler_->Int32Constant(0)),
       &pass, &fail);
   assembler_->Bind(&fail);
   assembler_->Return(assembler_->NullConstant());
   assembler_->Bind(&pass);
 }
 
-
 void FastAccessorAssembler::CheckNotZeroOrReturnNull(ValueId value) {
   CHECK_EQ(kBuilding, state_);
-  RawMachineLabel is_null, not_null;
+  CodeStubAssembler::Label is_null(assembler_.get());
+  CodeStubAssembler::Label not_null(assembler_.get());
   assembler_->Branch(
-      assembler_->IntPtrEqual(FromId(value), assembler_->IntPtrConstant(0)),
+      assembler_->WordEqual(FromId(value), assembler_->IntPtrConstant(0)),
       &is_null, &not_null);
   assembler_->Bind(&is_null);
   assembler_->Return(assembler_->NullConstant());
   assembler_->Bind(&not_null);
 }
 
-
 FastAccessorAssembler::LabelId FastAccessorAssembler::MakeLabel() {
   CHECK_EQ(kBuilding, state_);
-  RawMachineLabel* label =
-      new (zone()->New(sizeof(RawMachineLabel))) RawMachineLabel;
-  return FromRaw(label);
+  return FromRaw(new CodeStubAssembler::Label(assembler_.get()));
 }
 
-
 void FastAccessorAssembler::SetLabel(LabelId label_id) {
   CHECK_EQ(kBuilding, state_);
   assembler_->Bind(FromId(label_id));
 }
 
-
 void FastAccessorAssembler::CheckNotZeroOrJump(ValueId value_id,
                                                LabelId label_id) {
   CHECK_EQ(kBuilding, state_);
-  RawMachineLabel pass;
+  CodeStubAssembler::Label pass(assembler_.get());
   assembler_->Branch(
-      assembler_->IntPtrEqual(FromId(value_id), assembler_->IntPtrConstant(0)),
+      assembler_->WordEqual(FromId(value_id), assembler_->IntPtrConstant(0)),
       &pass, FromId(label_id));
   assembler_->Bind(&pass);
 }
 
 FastAccessorAssembler::ValueId FastAccessorAssembler::Call(
     FunctionCallback callback_function, ValueId arg) {
   CHECK_EQ(kBuilding, state_);
 
-  // Create API function stub.
-  CallApiCallbackStub stub(assembler_->isolate(), 1, true);
-  DCHECK_EQ(1, stub.GetCallInterfaceDescriptor().GetStackParameterCount());
-
   // Wrap the FunctionCallback in an ExternalReference.
   ApiFunction callback_api_function(FUNCTION_ADDR(callback_function));
   ExternalReference callback(&callback_api_function,
-                             ExternalReference::DIRECT_API_CALL,
-                             assembler_->isolate());
+                             ExternalReference::DIRECT_API_CALL, isolate());
 
-  // The stub has 6 parameters.
-  // See: ApiCallbackDescriptorBase::BuildCallInterfaceDescriptorFunctionType
-  Node* args[] = {
+  // Create & call API callback via stub.
+  CallApiCallbackStub stub(isolate(), 1, true);
+  DCHECK_EQ(5, stub.GetCallInterfaceDescriptor().GetParameterCount());
+  DCHECK_EQ(1, stub.GetCallInterfaceDescriptor().GetStackParameterCount());
+  // TODO(vogelheim): There is currently no clean way to retrieve the context
+  //     parameter for a stub and the implementation details are hidden in
+  //     compiler/*. The context_paramter is computed as:
+  //       Linkage::GetJSCallContextParamIndex(descriptor->JSParameterCount())
+  const int context_parameter = 2;
+  Node* call = assembler_->CallStub(
+      stub.GetCallInterfaceDescriptor(),
+      assembler_->HeapConstant(stub.GetCode()),
+      assembler_->Parameter(context_parameter),
+
       // Stub/register parameters:
       assembler_->Parameter(0),               /* receiver (use accessor's) */
       assembler_->UndefinedConstant(),        /* call_data (undefined) */
       assembler_->NullConstant(),             /* holder (null) */
       assembler_->ExternalConstant(callback), /* API callback function */
 
       // JS arguments, on stack:
-      FromId(arg),
+      FromId(arg));
 
-      // Context parameter. (See Linkage::GetStubCallDescriptor.)
-      assembler_->UndefinedConstant()};
-  DCHECK_EQ(arraysize(args),
-            1 + stub.GetCallInterfaceDescriptor().GetParameterCount());
-
-  Node* call = assembler_->CallN(
-      Linkage::GetStubCallDescriptor(
-          assembler_->isolate(), zone(), stub.GetCallInterfaceDescriptor(),
-          stub.GetStackParameterCount(), CallDescriptor::kNoFlags),
-      assembler_->HeapConstant(stub.GetCode()), args);
   return FromRaw(call);
 }
 
 MaybeHandle<Code> FastAccessorAssembler::Build() {
   CHECK_EQ(kBuilding, state_);
-
-  // Cleanup: We no longer need this.
-  nodes_.clear();
-  labels_.clear();
-
-  // Export the schedule and call the compiler.
-  Schedule* schedule = assembler_->Export();
-  Code::Flags flags = Code::ComputeFlags(Code::STUB);
-  MaybeHandle<Code> code = Pipeline::GenerateCodeForCodeStub(
-      assembler_->isolate(), assembler_->call_descriptor(), assembler_->graph(),
-      schedule, flags, "FastAccessorAssembler");
-
-  // Update state & return.
+  Handle<Code> code = assembler_->GenerateCode();
   state_ = !code.is_null() ? kBuilt : kError;
+  Clear();
   return code;
 }
 
-
 FastAccessorAssembler::ValueId FastAccessorAssembler::FromRaw(Node* node) {
   nodes_.push_back(node);
   ValueId value = {nodes_.size() - 1};
   return value;
 }
 
-
 FastAccessorAssembler::LabelId FastAccessorAssembler::FromRaw(
-    RawMachineLabel* label) {
+    CodeStubAssembler::Label* label) {
   labels_.push_back(label);
   LabelId label_id = {labels_.size() - 1};
   return label_id;
 }
 
-
 Node* FastAccessorAssembler::FromId(ValueId value) const {
   CHECK_LT(value.value_id, nodes_.size());
   CHECK_NOT_NULL(nodes_.at(value.value_id));
   return nodes_.at(value.value_id);
 }
 
-
-RawMachineLabel* FastAccessorAssembler::FromId(LabelId label) const {
+CodeStubAssembler::Label* FastAccessorAssembler::FromId(LabelId label) const {
   CHECK_LT(label.label_id, labels_.size());
   CHECK_NOT_NULL(labels_.at(label.label_id));
   return labels_.at(label.label_id);
 }
 
+void FastAccessorAssembler::Clear() {
+  for (auto label : labels_) {
+    delete label;
+  }
+  nodes_.clear();
+  labels_.clear();
+}
 
-}  // namespace compiler
 }  // namespace internal
 }  // namespace v8