diff --git a/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp b/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp
index 66be0a6..399c2e8 100644
--- a/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp
+++ b/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp
@@ -3115,6 +3115,12 @@
 {
     return emitCallVarargs(op_construct_varargs, dst, func, thisRegister, arguments, firstFreeRegister, firstVarArgOffset, divot, divotStart, divotEnd);
 }
+
+RegisterID* BytecodeGenerator::emitCallForwardArgumentsInTailPosition(RegisterID* dst, RegisterID* func, RegisterID* thisRegister, RegisterID* firstFreeRegister, int32_t firstVarArgOffset, const JSTextPosition& divot, const JSTextPosition& divotStart, const JSTextPosition& divotEnd)
+{
+    ASSERT(m_inTailPosition);
+    return emitCallVarargs(op_tail_call_forward_arguments, dst, func, thisRegister, nullptr, firstFreeRegister, firstVarArgOffset, divot, divotStart, divotEnd);
+}
     
 RegisterID* BytecodeGenerator::emitCallVarargs(OpcodeID opcode, RegisterID* dst, RegisterID* func, RegisterID* thisRegister, RegisterID* arguments, RegisterID* firstFreeRegister, int32_t firstVarArgOffset, const JSTextPosition& divot, const JSTextPosition& divotStart, const JSTextPosition& divotEnd)
 {
@@ -3130,7 +3136,7 @@
     instructions().append(dst->index());
     instructions().append(func->index());
     instructions().append(thisRegister ? thisRegister->index() : 0);
-    instructions().append(arguments->index());
+    instructions().append(arguments ? arguments->index() : 0);
     instructions().append(firstFreeRegister->index());
     instructions().append(firstVarArgOffset);
     instructions().append(arrayProfile);
diff --git a/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h b/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h
index 16b1f53..f7b6565 100644
--- a/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h
+++ b/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h
@@ -577,6 +577,7 @@
         RegisterID* emitCallEval(RegisterID* dst, RegisterID* func, CallArguments&, const JSTextPosition& divot, const JSTextPosition& divotStart, const JSTextPosition& divotEnd);
         RegisterID* emitCallVarargs(RegisterID* dst, RegisterID* func, RegisterID* thisRegister, RegisterID* arguments, RegisterID* firstFreeRegister, int32_t firstVarArgOffset, const JSTextPosition& divot, const JSTextPosition& divotStart, const JSTextPosition& divotEnd);
         RegisterID* emitCallVarargsInTailPosition(RegisterID* dst, RegisterID* func, RegisterID* thisRegister, RegisterID* arguments, RegisterID* firstFreeRegister, int32_t firstVarArgOffset, const JSTextPosition& divot, const JSTextPosition& divotStart, const JSTextPosition& divotEnd);
+        RegisterID* emitCallForwardArgumentsInTailPosition(RegisterID* dst, RegisterID* func, RegisterID* thisRegister, RegisterID* firstFreeRegister, int32_t firstVarArgOffset, const JSTextPosition& divot, const JSTextPosition& divotStart, const JSTextPosition& divotEnd);
 
         enum PropertyDescriptorOption {
             PropertyConfigurable = 1,
diff --git a/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp b/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp
index dfb4167..8abb458 100644
--- a/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp
+++ b/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp
@@ -888,6 +888,18 @@
     return generator.moveToDestinationIfNeeded(dst, generator.emitDirectPutByVal(base.get(), index.get(), value.get()));
 }
 
+RegisterID* BytecodeIntrinsicNode::emit_intrinsic_tailCallForwardArguments(BytecodeGenerator& generator, RegisterID* dst)
+{
+    ArgumentListNode* node = m_args->m_listNode;
+    RefPtr<RegisterID> function = generator.emitNode(node);
+    node = node->m_next;
+    RefPtr<RegisterID> thisRegister = generator.emitNode(node);
+    ASSERT(!node->m_next);
+
+    RefPtr<RegisterID> finalDst = generator.finalDestination(dst);
+    return generator.emitCallForwardArgumentsInTailPosition(finalDst.get(), function.get(), thisRegister.get(), generator.newTemporary(), 0, divot(), divotStart(), divotEnd());
+}
+
 RegisterID* BytecodeIntrinsicNode::emit_intrinsic_tryGetById(BytecodeGenerator& generator, RegisterID* dst)
 {
     ArgumentListNode* node = m_args->m_listNode;
@@ -899,8 +911,8 @@
     const Identifier& ident = static_cast<StringNode*>(node->m_expr)->value();
     ASSERT(!node->m_next);
 
-    RegisterID* finalDest = generator.finalDestination(dst);
-    return generator.emitTryGetById(finalDest, base.get(), ident);
+    RefPtr<RegisterID> finalDest = generator.finalDestination(dst);
+    return generator.emitTryGetById(finalDest.get(), base.get(), ident);
 }
 
 RegisterID* BytecodeIntrinsicNode::emit_intrinsic_toString(BytecodeGenerator& generator, RegisterID* dst)