[stubs] A new approach to TF stubs

src/compiler/raw-machine-assembler.cc

Index: src/compiler/raw-machine-assembler.cc
diff --git a/src/compiler/raw-machine-assembler.cc b/src/compiler/raw-machine-assembler.cc
index b88fe8c4f07486b9ed93668d603a8b891990c3b9..43a3aac2b5e91c518dcc48c08864d31e53448350 100644
--- a/src/compiler/raw-machine-assembler.cc
+++ b/src/compiler/raw-machine-assembler.cc
@@ -152,30 +152,10 @@ Node* RawMachineAssembler::CallNWithFrameState(CallDescriptor* desc,
 }
 
 
-Node* RawMachineAssembler::TailCallN(CallDescriptor* desc, Node* function,
-                                     Node** args) {
-  int param_count =
-      static_cast<int>(desc->GetMachineSignature()->parameter_count());
-  int input_count = param_count + 3;
-  Node** buffer = zone()->NewArray<Node*>(input_count);
-  int index = 0;
-  buffer[index++] = function;
-  for (int i = 0; i < param_count; i++) {
-    buffer[index++] = args[i];
-  }
-  buffer[index++] = graph()->start();
-  buffer[index++] = graph()->start();
-  Node* tail_call = MakeNode(common()->TailCall(desc), input_count, buffer);
-  schedule()->AddTailCall(CurrentBlock(), tail_call);
-  current_block_ = nullptr;
-  return tail_call;
-}
-
-
 Node* RawMachineAssembler::CallRuntime1(Runtime::FunctionId function,
                                         Node* arg1, Node* context) {
   CallDescriptor* descriptor = Linkage::GetRuntimeCallDescriptor(
-      zone(), function, 1, Operator::kNoProperties, false);
+      zone(), function, 1, Operator::kNoProperties, CallDescriptor::kNoFlags);
 
   Node* centry = HeapConstant(CEntryStub(isolate(), 1).GetCode());
   Node* ref = AddNode(
@@ -190,7 +170,7 @@ Node* RawMachineAssembler::CallRuntime1(Runtime::FunctionId function,
 Node* RawMachineAssembler::CallRuntime2(Runtime::FunctionId function,
                                         Node* arg1, Node* arg2, Node* context) {
   CallDescriptor* descriptor = Linkage::GetRuntimeCallDescriptor(
-      zone(), function, 2, Operator::kNoProperties, false);
+      zone(), function, 2, Operator::kNoProperties, CallDescriptor::kNoFlags);
 
   Node* centry = HeapConstant(CEntryStub(isolate(), 1).GetCode());
   Node* ref = AddNode(
@@ -206,7 +186,7 @@ Node* RawMachineAssembler::CallRuntime4(Runtime::FunctionId function,
                                         Node* arg1, Node* arg2, Node* arg3,
                                         Node* arg4, Node* context) {
   CallDescriptor* descriptor = Linkage::GetRuntimeCallDescriptor(
-      zone(), function, 4, Operator::kNoProperties, false);
+      zone(), function, 4, Operator::kNoProperties, CallDescriptor::kNoFlags);
 
   Node* centry = HeapConstant(CEntryStub(isolate(), 1).GetCode());
   Node* ref = AddNode(
@@ -218,6 +198,72 @@ Node* RawMachineAssembler::CallRuntime4(Runtime::FunctionId function,
 }
 
 
+Node* RawMachineAssembler::TailCallN(CallDescriptor* desc, Node* function,
+                                     Node** args) {
+  int param_count =
+      static_cast<int>(desc->GetMachineSignature()->parameter_count());
+  int input_count = param_count + 3;
+  Node** buffer = zone()->NewArray<Node*>(input_count);
+  int index = 0;
+  buffer[index++] = function;
+  for (int i = 0; i < param_count; i++) {
+    buffer[index++] = args[i];
+  }
+  buffer[index++] = graph()->start();
+  buffer[index++] = graph()->start();
+  Node* tail_call = MakeNode(common()->TailCall(desc), input_count, buffer);
+  schedule()->AddTailCall(CurrentBlock(), tail_call);
+  current_block_ = nullptr;
+  return tail_call;
+}
+
+
+Node* RawMachineAssembler::TailCallRuntime1(Runtime::FunctionId function,
+                                            Node* arg1, Node* context) {
+  const int kArity = 1;
+  CallDescriptor* desc = Linkage::GetRuntimeCallDescriptor(
+      zone(), function, kArity, Operator::kNoProperties,
+      CallDescriptor::kSupportsTailCalls);
+
+  Node* centry = HeapConstant(CEntryStub(isolate(), 1).GetCode());
+  Node* ref = AddNode(
+      common()->ExternalConstant(ExternalReference(function, isolate())));
+  Node* arity = Int32Constant(kArity);
+
+  Node* nodes[] = {centry,          arg1, ref, arity, context, graph()->start(),
+                   graph()->start()};
+  Node* tail_call = MakeNode(common()->TailCall(desc), arraysize(nodes), nodes);
+
+  schedule()->AddTailCall(CurrentBlock(), tail_call);
+  current_block_ = nullptr;
+  return tail_call;
+}
+
+
+Node* RawMachineAssembler::TailCallRuntime2(Runtime::FunctionId function,
+                                            Node* arg1, Node* arg2,
+                                            Node* context) {
+  const int kArity = 2;
+  CallDescriptor* desc = Linkage::GetRuntimeCallDescriptor(
+      zone(), function, kArity, Operator::kNoProperties,
+      CallDescriptor::kSupportsTailCalls);
+
+  Node* centry = HeapConstant(CEntryStub(isolate(), 1).GetCode());
+  Node* ref = AddNode(
+      common()->ExternalConstant(ExternalReference(function, isolate())));
+  Node* arity = Int32Constant(kArity);
+
+  Node* nodes[] = {
+      centry,          arg1, arg2, ref, arity, context, graph()->start(),
+      graph()->start()};
+  Node* tail_call = MakeNode(common()->TailCall(desc), arraysize(nodes), nodes);
+
+  schedule()->AddTailCall(CurrentBlock(), tail_call);
+  current_block_ = nullptr;
+  return tail_call;
+}
+
+
 Node* RawMachineAssembler::CallCFunction0(MachineType return_type,
                                           Node* function) {
   MachineSignature::Builder builder(zone(), 1, 0);