new classes: implement correct check for uninitialized this in 'super()'

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 2942 matching lines @@
 void FullCodeGenerator::EmitSuperConstructorCall(Call* expr) {
   Comment cmnt(masm_, "[ SuperConstructorCall");
   Variable* new_target_var = scope()->DeclarationScope()->new_target_var();
   GetVar(result_register(), new_target_var);
   __ Push(result_register());
 
   SuperReference* super_ref = expr->expression()->AsSuperReference();
   EmitLoadSuperConstructor();
   __ push(result_register());
 
-  Variable* this_var = super_ref->this_var()->var();
-
-  GetVar(x0, this_var);
-  Label uninitialized_this;
-  __ JumpIfRoot(x0, Heap::kTheHoleValueRootIndex, &uninitialized_this);
-  __ Mov(x0, Operand(this_var->name()));
-  __ Push(x0);
-  __ CallRuntime(Runtime::kThrowReferenceError, 1);
-  __ bind(&uninitialized_this);
-
   // 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.
   SetSourcePosition(expr->position());
@@ skipping 15 matching lines @@
   __ 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);
 
+  Variable* this_var = super_ref->this_var()->var();
+  GetVar(x1, this_var);
+  Label uninitialized_this;
+  __ JumpIfRoot(x1, Heap::kTheHoleValueRootIndex, &uninitialized_this);
+  __ Mov(x0, Operand(this_var->name()));
+  __ Push(x0);
+  __ CallRuntime(Runtime::kThrowReferenceError, 1);
+  __ bind(&uninitialized_this);
+
   EmitVariableAssignment(this_var, Token::INIT_CONST);
   context()->Plug(x0);
 }
 
 
 void FullCodeGenerator::EmitIsSmi(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 1);
 
   VisitForAccumulatorValue(args->at(0));
@@ skipping 2452 matching lines @@
   return previous_;
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64