[es6] Tail calls support.

src/builtins.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/builtins.h"
 
 #include "src/api.h"
 #include "src/api-natives.h"
 #include "src/arguments.h"
 #include "src/base/once.h"
@@ skipping 3508 matching lines @@
     case ConvertReceiverMode::kNotNullOrUndefined:
       return Call_ReceiverIsNotNullOrUndefined();
     case ConvertReceiverMode::kAny:
       return Call_ReceiverIsAny();
   }
   UNREACHABLE();
   return Handle<Code>::null();
 }
 
 
+Handle<Code> Builtins::TailCallFunction(ConvertReceiverMode mode) {
+  switch (mode) {
+    case ConvertReceiverMode::kNullOrUndefined:
+      return TailCallFunction_ReceiverIsNullOrUndefined();
+    case ConvertReceiverMode::kNotNullOrUndefined:
+      return TailCallFunction_ReceiverIsNotNullOrUndefined();
+    case ConvertReceiverMode::kAny:
+      return TailCallFunction_ReceiverIsAny();
+  }
+  UNREACHABLE();
+  return Handle<Code>::null();
+}
+
+
+Handle<Code> Builtins::TailCall(ConvertReceiverMode mode) {
+  UNREACHABLE();
+  switch (mode) {
+    case ConvertReceiverMode::kNullOrUndefined:
+      return Call_ReceiverIsNullOrUndefined();
+    case ConvertReceiverMode::kNotNullOrUndefined:
+      return Call_ReceiverIsNotNullOrUndefined();
+    case ConvertReceiverMode::kAny:
+      return Call_ReceiverIsAny();
+  }
+  UNREACHABLE();
+  return Handle<Code>::null();
+}
+
+
 namespace {
 
 class RelocatableArguments
     : public BuiltinArguments<BuiltinExtraArguments::kTarget>,
       public Relocatable {
  public:
   RelocatableArguments(Isolate* isolate, int length, Object** arguments)
       : BuiltinArguments<BuiltinExtraArguments::kTarget>(length, arguments),
         Relocatable(isolate) {}
 
@@ skipping 459 matching lines @@
 BUILTIN_LIST_C(DEFINE_BUILTIN_ACCESSOR_C)
 BUILTIN_LIST_A(DEFINE_BUILTIN_ACCESSOR_A)
 BUILTIN_LIST_H(DEFINE_BUILTIN_ACCESSOR_H)
 BUILTIN_LIST_DEBUG_A(DEFINE_BUILTIN_ACCESSOR_A)
 #undef DEFINE_BUILTIN_ACCESSOR_C
 #undef DEFINE_BUILTIN_ACCESSOR_A
 
 
 }  // namespace internal
 }  // namespace v8