[turbofan] Enable tail calls for %_CallFunction.

src/compiler/js-intrinsic-lowering.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/js-intrinsic-lowering.h"
 
 #include <stack>
 
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
@@ skipping 76 matching lines @@
     case Runtime::kInlineIsMinusZero:
       return ReduceIsMinusZero(node);
     case Runtime::kInlineFixedArraySet:
       return ReduceFixedArraySet(node);
     case Runtime::kInlineGetTypeFeedbackVector:
       return ReduceGetTypeFeedbackVector(node);
     case Runtime::kInlineGetCallerJSFunction:
       return ReduceGetCallerJSFunction(node);
     case Runtime::kInlineThrowNotDateError:
       return ReduceThrowNotDateError(node);
+    case Runtime::kInlineCallFunction:
+      return ReduceCallFunction(node);
     default:
       break;
   }
   return NoChange();
 }
 
 
 Reduction JSIntrinsicLowering::ReduceConstructDouble(Node* node) {
   Node* high = NodeProperties::GetValueInput(node, 0);
   Node* low = NodeProperties::GetValueInput(node, 1);
@@ skipping 399 matching lines @@
   Node* deoptimize =
       graph()->NewNode(common()->Deoptimize(), frame_state, effect, control);
   NodeProperties::MergeControlToEnd(graph(), common(), deoptimize);
 
   node->set_op(common()->Dead());
   node->TrimInputCount(0);
   return Changed(node);
 }
 
 
+Reduction JSIntrinsicLowering::ReduceCallFunction(Node* node) {
+  CallRuntimeParameters params = OpParameter<CallRuntimeParameters>(node->op());
+  size_t arity = params.arity();
+  node->set_op(javascript()->CallFunction(arity, NO_CALL_FUNCTION_FLAGS, STRICT,
+                                          VectorSlotPair(), ALLOW_TAIL_CALLS));
+  Node* function = node->InputAt(static_cast<int>(arity - 1));
+  while (--arity != 0) {
+    node->ReplaceInput(static_cast<int>(arity),
+                       node->InputAt(static_cast<int>(arity - 1)));
+  }
+  node->ReplaceInput(0, function);
+  return Changed(node);
+}
+
+
 Reduction JSIntrinsicLowering::Change(Node* node, const Operator* op, Node* a,
                                       Node* b) {
   node->set_op(op);
   node->ReplaceInput(0, a);
   node->ReplaceInput(1, b);
   node->TrimInputCount(2);
   RelaxControls(node);
   return Changed(node);
 }
 
@@ skipping 16 matching lines @@
 }
 
 
 Graph* JSIntrinsicLowering::graph() const { return jsgraph()->graph(); }
 
 
 CommonOperatorBuilder* JSIntrinsicLowering::common() const {
   return jsgraph()->common();
 }
 
+JSOperatorBuilder* JSIntrinsicLowering::javascript() const {
+  return jsgraph_->javascript();
+}
+
 
 MachineOperatorBuilder* JSIntrinsicLowering::machine() const {
   return jsgraph()->machine();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8