[crankshaft] Fixing ES6 tail call elimination.

src/crankshaft/hydrogen-instructions.cc

 // Copyright 2012 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/crankshaft/hydrogen-instructions.h"
 
 #include "src/base/bits.h"
 #include "src/base/safe_math.h"
 #include "src/crankshaft/hydrogen-infer-representation.h"
 #include "src/double.h"
@@ skipping 893 matching lines @@
 std::ostream& HUnaryCall::PrintDataTo(std::ostream& os) const {  // NOLINT
   return os << NameOf(value()) << " #" << argument_count();
 }
 
 
 std::ostream& HBinaryCall::PrintDataTo(std::ostream& os) const {  // NOLINT
   return os << NameOf(first()) << " " << NameOf(second()) << " #"
             << argument_count();
 }
 
+std::ostream& HInvokeFunction::PrintTo(std::ostream& os) const {  // NOLINT
+  if (tail_call_mode() == TailCallMode::kAllow) os << "Tail";
+  return HBinaryCall::PrintTo(os);
+}
+
+std::ostream& HInvokeFunction::PrintDataTo(std::ostream& os) const {  // NOLINT
+  HBinaryCall::PrintDataTo(os);
+  if (syntactic_tail_call_mode() == TailCallMode::kAllow) {
+    os << ", JSTailCall";
+  }
+  return os;
+}
 
 void HBoundsCheck::ApplyIndexChange() {
   if (skip_check()) return;
 
   DecompositionResult decomposition;
   bool index_is_decomposable = index()->TryDecompose(&decomposition);
   if (index_is_decomposable) {
     DCHECK(decomposition.base() == base());
     if (decomposition.offset() == offset() &&
         decomposition.scale() == scale()) return;
@@ skipping 102 matching lines @@
   return os << "base: " << NameOf(base_index())
             << ", check: " << NameOf(base_index());
 }
 
 
 std::ostream& HCallWithDescriptor::PrintDataTo(
     std::ostream& os) const {  // NOLINT
   for (int i = 0; i < OperandCount(); i++) {
     os << NameOf(OperandAt(i)) << " ";
   }
-  return os << "#" << argument_count();
+  os << "#" << argument_count();
+  if (syntactic_tail_call_mode() == TailCallMode::kAllow) {
+    os << ", JSTailCall";
+  }
+  return os;
 }
 
 
 std::ostream& HCallNewArray::PrintDataTo(std::ostream& os) const {  // NOLINT
   os << ElementsKindToString(elements_kind()) << " ";
   return HBinaryCall::PrintDataTo(os);
 }
 
 
 std::ostream& HCallRuntime::PrintDataTo(std::ostream& os) const {  // NOLINT
@@ skipping 3574 matching lines @@
     case HObjectAccess::kExternalMemory:
       os << "[external-memory]";
       break;
   }
 
   return os << "@" << access.offset();
 }
 
 }  // namespace internal
 }  // namespace v8