[turbofan] Fix tail call optimization.

src/compiler/common-operator.cc

 // Copyright 2014 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/common-operator.h"
 
 #include "src/assembler.h"
 #include "src/base/lazy-instance.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/opcodes.h"
@@ skipping 644 matching lines @@
       IrOpcode::kFrameState, Operator::kPure,         // opcode
       "FrameState",                                   // name
       4, 0, 0, 1, 0, 0,                               // counts
       FrameStateCallInfo(type, bailout_id, state_combine, jsfunction));
 }
 
 
 const Operator* CommonOperatorBuilder::Call(const CallDescriptor* descriptor) {
   class CallOperator final : public Operator1<const CallDescriptor*> {
    public:
-    CallOperator(const CallDescriptor* descriptor, const char* mnemonic)
+    explicit CallOperator(const CallDescriptor* descriptor)
         : Operator1<const CallDescriptor*>(
-              IrOpcode::kCall, descriptor->properties(), mnemonic,
+              IrOpcode::kCall, descriptor->properties(), "Call",
               descriptor->InputCount() + descriptor->FrameStateCount(),
               Operator::ZeroIfPure(descriptor->properties()),
               Operator::ZeroIfEliminatable(descriptor->properties()),
               descriptor->ReturnCount(),
               Operator::ZeroIfPure(descriptor->properties()),
               Operator::ZeroIfNoThrow(descriptor->properties()), descriptor) {}
 
     void PrintParameter(std::ostream& os) const override {
       os << "[" << *parameter() << "]";
     }
   };
-  return new (zone()) CallOperator(descriptor, "Call");
+  return new (zone()) CallOperator(descriptor);
 }
 
 
+const Operator* CommonOperatorBuilder::TailCall(
+    const CallDescriptor* descriptor) {
+  class TailCallOperator final : public Operator1<const CallDescriptor*> {
+   public:
+    explicit TailCallOperator(const CallDescriptor* descriptor)
+        : Operator1<const CallDescriptor*>(
+              IrOpcode::kTailCall, descriptor->properties(), "TailCall",
+              descriptor->InputCount() + descriptor->FrameStateCount(), 1, 1, 0,
+              0, 1, descriptor) {}
+
+    void PrintParameter(std::ostream& os) const override {
+      os << "[" << *parameter() << "]";
+    }
+  };
+  return new (zone()) TailCallOperator(descriptor);
+}
+
+
 const Operator* CommonOperatorBuilder::Projection(size_t index) {
   switch (index) {
 #define CACHED_PROJECTION(index) \
   case index:                    \
     return &cache_.kProjection##index##Operator;
     CACHED_PROJECTION_LIST(CACHED_PROJECTION)
 #undef CACHED_PROJECTION
     default:
       break;
   }
@@ skipping 20 matching lines @@
   } else {
     UNREACHABLE();
     return nullptr;
   }
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8