[es6] Tail calls support.

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index b7f30433d5f35a33128b1494639b82679c1174b9..b64f4e68aecf92317aaa77bdc21522008b89c6e1 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -3553,29 +3553,68 @@ BUILTIN(HandleApiCallConstruct) {
   return *result;
 }
 
-
-Handle<Code> Builtins::CallFunction(ConvertReceiverMode mode) {
-  switch (mode) {
-    case ConvertReceiverMode::kNullOrUndefined:
-      return CallFunction_ReceiverIsNullOrUndefined();
-    case ConvertReceiverMode::kNotNullOrUndefined:
-      return CallFunction_ReceiverIsNotNullOrUndefined();
-    case ConvertReceiverMode::kAny:
-      return CallFunction_ReceiverIsAny();
+Handle<Code> Builtins::CallFunction(ConvertReceiverMode mode,
+                                    TailCallMode tail_call_mode) {
+  switch (tail_call_mode) {
+    case TailCallMode::kDisallow:
+      switch (mode) {
+        case ConvertReceiverMode::kNullOrUndefined:
+          return CallFunction_ReceiverIsNullOrUndefined();
+        case ConvertReceiverMode::kNotNullOrUndefined:
+          return CallFunction_ReceiverIsNotNullOrUndefined();
+        case ConvertReceiverMode::kAny:
+          return CallFunction_ReceiverIsAny();
+      }
+      break;
+    case TailCallMode::kAllow:
+      switch (mode) {
+        case ConvertReceiverMode::kNullOrUndefined:
+          return TailCallFunction_ReceiverIsNullOrUndefined();
+        case ConvertReceiverMode::kNotNullOrUndefined:
+          return TailCallFunction_ReceiverIsNotNullOrUndefined();
+        case ConvertReceiverMode::kAny:
+          return TailCallFunction_ReceiverIsAny();
+      }
+      break;
   }
   UNREACHABLE();
   return Handle<Code>::null();
 }
 
+Handle<Code> Builtins::Call(ConvertReceiverMode mode,
+                            TailCallMode tail_call_mode) {
+  switch (tail_call_mode) {
+    case TailCallMode::kDisallow:
+      switch (mode) {
+        case ConvertReceiverMode::kNullOrUndefined:
+          return Call_ReceiverIsNullOrUndefined();
+        case ConvertReceiverMode::kNotNullOrUndefined:
+          return Call_ReceiverIsNotNullOrUndefined();
+        case ConvertReceiverMode::kAny:
+          return Call_ReceiverIsAny();
+      }
+      break;
+    case TailCallMode::kAllow:
+      switch (mode) {
+        case ConvertReceiverMode::kNullOrUndefined:
+          return TailCall_ReceiverIsNullOrUndefined();
+        case ConvertReceiverMode::kNotNullOrUndefined:
+          return TailCall_ReceiverIsNotNullOrUndefined();
+        case ConvertReceiverMode::kAny:
+          return TailCall_ReceiverIsAny();
+      }
+      break;
+  }
+  UNREACHABLE();
+  return Handle<Code>::null();
+}
 
-Handle<Code> Builtins::Call(ConvertReceiverMode mode) {
-  switch (mode) {
-    case ConvertReceiverMode::kNullOrUndefined:
-      return Call_ReceiverIsNullOrUndefined();
-    case ConvertReceiverMode::kNotNullOrUndefined:
-      return Call_ReceiverIsNotNullOrUndefined();
-    case ConvertReceiverMode::kAny:
-      return Call_ReceiverIsAny();
+Handle<Code> Builtins::CallBoundFunction(TailCallMode tail_call_mode) {
+  switch (tail_call_mode) {
+    case TailCallMode::kDisallow:
+      return CallBoundFunction();
+    case TailCallMode::kAllow:
+      return TailCallBoundFunction();
   }
   UNREACHABLE();
   return Handle<Code>::null();