new classes: special construct stub for derived classs and TDZ for `this`.

src/x64/builtins-x64.cc

Index: src/x64/builtins-x64.cc
diff --git a/src/x64/builtins-x64.cc b/src/x64/builtins-x64.cc
index ff0a349dbd2729de6f04979705a1e8f56f25dd2d..80a41dde16c6d06b570347c9d2772fb1795db1b3 100644
--- a/src/x64/builtins-x64.cc
+++ b/src/x64/builtins-x64.cc
@@ -498,6 +498,59 @@ void Builtins::Generate_JSConstructStubApi(MacroAssembler* masm) {
 }
 
 
+void Builtins::Generate_JSConstructStubForDerived(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- rax: number of arguments
+  //  -- rdi: constructor function
+  //  -- rbx: allocation site or undefined
+  //  -- rdx: original constructor
+  // -----------------------------------
+  // TODO(dslomov): support pretenuring
+  CHECK(!FLAG_pretenuring_call_new);
+
+  {
+    FrameScope frame_scope(masm, StackFrame::CONSTRUCT);
+
+    // Store a smi-tagged arguments count on the stack.
+    __ Integer32ToSmi(rax, rax);
+    __ Push(rax);
+    __ SmiToInteger32(rax, rax);
+
+    // receiver is the hole.
+    __ Push(masm->isolate()->factory()->the_hole_value());
+
+    // Set up pointer to last argument.
+    __ leap(rbx, Operand(rbp, StandardFrameConstants::kCallerSPOffset));
+
+    // Copy arguments and receiver to the expression stack.
+    Label loop, entry;
+    __ movp(rcx, rax);
+    __ jmp(&entry);
+    __ bind(&loop);
+    __ Push(Operand(rbx, rcx, times_pointer_size, 0));
+    __ bind(&entry);
+    __ decp(rcx);
+    __ j(greater_equal, &loop);
+
+    // Call the function.
+    ParameterCount actual(rax);
+    __ InvokeFunction(rdi, actual, CALL_FUNCTION, NullCallWrapper());
+
+    // Restore context from the frame.
+    __ movp(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
+
+    __ movp(rbx, Operand(rsp, 0));  // Get arguments count.
+  }                                 // Leave construct frame.
+
+  // Remove caller arguments from the stack and return.
+  __ PopReturnAddressTo(rcx);
+  SmiIndex index = masm->SmiToIndex(rbx, rbx, kPointerSizeLog2);
+  __ leap(rsp, Operand(rsp, index.reg, index.scale, 1 * kPointerSize));
+  __ PushReturnAddressFrom(rcx);
+  __ ret(0);
+}
+
+
 static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
                                              bool is_construct) {
   ProfileEntryHookStub::MaybeCallEntryHook(masm);