Switch CallConstructStub to take new.target in register.

src/mips/full-codegen-mips.cc

 // Copyright 2012 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_MIPS
 
 // Note on Mips implementation:
 //
@@ skipping 3350 matching lines @@
   PrepareForBailoutForId(expr->ReturnId(), TOS_REG);
   context()->Plug(v0);
 }
 
 
 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 t0.
+  VisitForAccumulatorValue(super_call_ref->new_target_var());
+  __ mov(t0, result_register());
+
   // Load function and argument count into a1 and a0.
   __ li(a0, Operand(arg_count));
   __ lw(a1, MemOperand(sp, arg_count * kPointerSize));
 
   // 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);
     */
   }
 
   __ li(a2, FeedbackVector());
   __ li(a3, Operand(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(v0);
 }
 
 
 void FullCodeGenerator::EmitIsSmi(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 1);
@@ skipping 915 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 t0.
+  __ lw(t0, MemOperand(sp, 1 * kPointerSize));
+
   // Check if the calling frame is an arguments adaptor frame.
   Label adaptor_frame, args_set_up, runtime;
   __ lw(a2, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
   __ lw(a3, MemOperand(a2, StandardFrameConstants::kContextOffset));
   __ Branch(&adaptor_frame, eq, a3,
             Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
   // default constructor has no arguments, so no adaptor frame means no args.
   __ mov(a0, zero_reg);
   __ Branch(&args_set_up);
 
@@ skipping 1241 matching lines @@
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OsrAfterStackCheck()->entry()));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS