[es6] Tail calls support.

src/builtins.h

Index: src/builtins.h
diff --git a/src/builtins.h b/src/builtins.h
index b9629d28d16713d099713b6a3cc8b192c57b2e9c..8ddadd6e75983ccbe2c599d2243d3655795cdfe3 100644
--- a/src/builtins.h
+++ b/src/builtins.h
@@ -157,6 +157,11 @@ inline bool operator&(BuiltinExtraArguments lhs, BuiltinExtraArguments rhs) {
   V(CallFunction_ReceiverIsNotNullOrUndefined, BUILTIN, UNINITIALIZED,         \
     kNoExtraICState)                                                           \
   V(CallFunction_ReceiverIsAny, BUILTIN, UNINITIALIZED, kNoExtraICState)       \
+  V(TailCallFunction_ReceiverIsNullOrUndefined, BUILTIN, UNINITIALIZED,        \
+    kNoExtraICState)                                                           \
+  V(TailCallFunction_ReceiverIsNotNullOrUndefined, BUILTIN, UNINITIALIZED,     \
+    kNoExtraICState)                                                           \
+  V(TailCallFunction_ReceiverIsAny, BUILTIN, UNINITIALIZED, kNoExtraICState)   \
   V(CallBoundFunction, BUILTIN, UNINITIALIZED, kNoExtraICState)                \
   V(Call_ReceiverIsNullOrUndefined, BUILTIN, UNINITIALIZED, kNoExtraICState)   \
   V(Call_ReceiverIsNotNullOrUndefined, BUILTIN, UNINITIALIZED,                 \
@@ -339,6 +344,9 @@ class Builtins {
   // Convenience wrappers.
   Handle<Code> CallFunction(ConvertReceiverMode = ConvertReceiverMode::kAny);
   Handle<Code> Call(ConvertReceiverMode = ConvertReceiverMode::kAny);
+  Handle<Code> TailCallFunction(
+      ConvertReceiverMode = ConvertReceiverMode::kAny);
+  Handle<Code> TailCall(ConvertReceiverMode = ConvertReceiverMode::kAny);
 
   Code* builtin(Name name) {
     // Code::cast cannot be used here since we access builtins
@@ -403,17 +411,35 @@ class Builtins {
 
   // ES6 section 9.2.1 [[Call]] ( thisArgument, argumentsList)
   static void Generate_CallFunction(MacroAssembler* masm,
-                                    ConvertReceiverMode mode);
+                                    ConvertReceiverMode mode,
+                                    TailCallMode tail_call_mode);
   static void Generate_CallFunction_ReceiverIsNullOrUndefined(
       MacroAssembler* masm) {
-    Generate_CallFunction(masm, ConvertReceiverMode::kNullOrUndefined);
+    Generate_CallFunction(masm, ConvertReceiverMode::kNullOrUndefined,
+                          TailCallMode::kDisallow);
   }
   static void Generate_CallFunction_ReceiverIsNotNullOrUndefined(
       MacroAssembler* masm) {
-    Generate_CallFunction(masm, ConvertReceiverMode::kNotNullOrUndefined);
+    Generate_CallFunction(masm, ConvertReceiverMode::kNotNullOrUndefined,
+                          TailCallMode::kDisallow);
   }
   static void Generate_CallFunction_ReceiverIsAny(MacroAssembler* masm) {
-    Generate_CallFunction(masm, ConvertReceiverMode::kAny);
+    Generate_CallFunction(masm, ConvertReceiverMode::kAny,
+                          TailCallMode::kDisallow);
+  }
+  static void Generate_TailCallFunction_ReceiverIsNullOrUndefined(
+      MacroAssembler* masm) {
+    Generate_CallFunction(masm, ConvertReceiverMode::kNullOrUndefined,
+                          TailCallMode::kAllow);
+  }
+  static void Generate_TailCallFunction_ReceiverIsNotNullOrUndefined(
+      MacroAssembler* masm) {
+    Generate_CallFunction(masm, ConvertReceiverMode::kNotNullOrUndefined,
+                          TailCallMode::kAllow);
+  }
+  static void Generate_TailCallFunction_ReceiverIsAny(MacroAssembler* masm) {
+    Generate_CallFunction(masm, ConvertReceiverMode::kAny,
+                          TailCallMode::kAllow);
   }
   // ES6 section 9.4.1.1 [[Call]] ( thisArgument, argumentsList)
   static void Generate_CallBoundFunction(MacroAssembler* masm);