Switch CallConstructStub to take new.target in register.

src/arm64/full-codegen-arm64.cc

 // Copyright 2013 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/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 3056 matching lines @@
   PrepareForBailoutForId(expr->ReturnId(), TOS_REG);
   context()->Plug(x0);
 }
 
 
 void FullCodeGenerator::EmitSuperConstructorCall(Call* expr) {
   SuperCallReference* super_call_ref =
       expr->expression()->AsSuperCallReference();
   DCHECK_NOT_NULL(super_call_ref);
 
-  VariableProxy* new_target_proxy = super_call_ref->new_target_var();
-  VisitForStackValue(new_target_proxy);
-
   EmitLoadSuperConstructor(super_call_ref);
   __ push(result_register());
 
   // Push the arguments ("left-to-right") on the stack.
   ZoneList<Expression*>* args = expr->arguments();
   int arg_count = args->length();
   for (int i = 0; i < arg_count; i++) {
     VisitForStackValue(args->at(i));
   }
 
   // Call the construct call builtin that handles allocation and
   // constructor invocation.
   SetConstructCallPosition(expr);
 
+  // Load original constructor into x4.
+  VisitForAccumulatorValue(super_call_ref->new_target_var());
+  __ Mov(x4, result_register());
+
   // Load function and argument count into x1 and x0.
   __ Mov(x0, arg_count);
   __ Peek(x1, arg_count * kXRegSize);
 
   // Record call targets in unoptimized code.
   if (FLAG_pretenuring_call_new) {
     UNREACHABLE();
     /* TODO(dslomov): support pretenuring.
     EnsureSlotContainsAllocationSite(expr->AllocationSiteFeedbackSlot());
     DCHECK(expr->AllocationSiteFeedbackSlot().ToInt() ==
            expr->CallNewFeedbackSlot().ToInt() + 1);
     */
   }
 
   __ LoadObject(x2, FeedbackVector());
   __ Mov(x3, SmiFromSlot(expr->CallFeedbackSlot()));
 
   CallConstructStub stub(isolate(), SUPER_CALL_RECORD_TARGET);
   __ Call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
 
-  __ Drop(1);
-
   RecordJSReturnSite(expr);
 
   EmitInitializeThisAfterSuper(super_call_ref, expr->CallFeedbackICSlot());
   context()->Plug(x0);
 }
 
 
 void FullCodeGenerator::EmitIsSmi(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 1);
@@ skipping 910 matching lines @@
   DCHECK(args->length() == 2);
 
   // new.target
   VisitForStackValue(args->at(0));
 
   // .this_function
   VisitForStackValue(args->at(1));
   __ CallRuntime(Runtime::kGetPrototype, 1);
   __ Push(result_register());
 
+  // Load original constructor into x4.
+  __ Peek(x4, 1 * kPointerSize);
+
   // Check if the calling frame is an arguments adaptor frame.
   Label adaptor_frame, args_set_up, runtime;
   __ Ldr(x11, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
   __ Ldr(x12, MemOperand(x11, StandardFrameConstants::kContextOffset));
   __ Cmp(x12, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
   __ B(eq, &adaptor_frame);
   // default constructor has no arguments, so no adaptor frame means no args.
   __ Mov(x0, Operand(0));
   __ B(&args_set_up);
 
@@ skipping 1560 matching lines @@
   }
 
   return INTERRUPT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64