new classes: implement new.target passing to superclass constructor.

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 244 matching lines @@
     int num_parameters = info->scope()->num_parameters();
     int offset = num_parameters * kPointerSize;
     __ Add(x2, fp, StandardFrameConstants::kCallerSPOffset + offset);
     __ Mov(x1, Smi::FromInt(num_parameters));
     __ Push(x3, x2, x1);
 
     // Arguments to ArgumentsAccessStub:
     //   function, receiver address, parameter count.
     // The stub will rewrite receiver and parameter count if the previous
     // stack frame was an arguments adapter frame.
+    ArgumentsAccessStub::HasNewTarget has_new_target =
+        IsSubclassConstructor(info->function()->kind())
+            ? ArgumentsAccessStub::HAS_NEW_TARGET
+            : ArgumentsAccessStub::NO_NEW_TARGET;
     ArgumentsAccessStub::Type type;
     if (is_strict(language_mode())) {
       type = ArgumentsAccessStub::NEW_STRICT;
     } else if (function()->has_duplicate_parameters()) {
       type = ArgumentsAccessStub::NEW_SLOPPY_SLOW;
     } else {
       type = ArgumentsAccessStub::NEW_SLOPPY_FAST;
     }
-    ArgumentsAccessStub stub(isolate(), type);
+    ArgumentsAccessStub stub(isolate(), type, has_new_target);
     __ CallStub(&stub);
 
     SetVar(arguments, x0, x1, x2);
   }
 
   if (FLAG_trace) {
     __ CallRuntime(Runtime::kTraceEnter, 0);
   }
 
 
@@ skipping 164 matching lines @@
       __ mov(current_sp, fp);
       int no_frame_start = masm_->pc_offset();
       __ ldp(fp, lr, MemOperand(current_sp, 2 * kXRegSize, PostIndex));
       // Drop the arguments and receiver and return.
       // TODO(all): This implementation is overkill as it supports 2**31+1
       // arguments, consider how to improve it without creating a security
       // hole.
       __ ldr_pcrel(ip0, (3 * kInstructionSize) >> kLoadLiteralScaleLog2);
       __ add(current_sp, current_sp, ip0);
       __ ret();
-      __ dc64(kXRegSize * (info_->scope()->num_parameters() + 1));
+      int32_t arg_count = info_->scope()->num_parameters() + 1;
+      if (FLAG_experimental_classes &&
+          IsSubclassConstructor(info_->function()->kind())) {
+        arg_count++;
+      }
+      __ dc64(kXRegSize * arg_count);
       info_->AddNoFrameRange(no_frame_start, masm_->pc_offset());
     }
   }
 }
 
 
 void FullCodeGenerator::EffectContext::Plug(Variable* var) const {
   DCHECK(var->IsStackAllocated() || var->IsContextSlot());
 }
 
@@ skipping 2470 matching lines @@
   __ Mov(x3, SmiFromSlot(expr->CallNewFeedbackSlot()));
 
   CallConstructStub stub(isolate(), RECORD_CONSTRUCTOR_TARGET);
   __ Call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
   PrepareForBailoutForId(expr->ReturnId(), TOS_REG);
   context()->Plug(x0);
 }
 
 
 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(super_ref);
   __ 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()));
@@ skipping 22 matching lines @@
     /* TODO(dslomov): support pretenuring.
     EnsureSlotContainsAllocationSite(expr->AllocationSiteFeedbackSlot());
     DCHECK(expr->AllocationSiteFeedbackSlot().ToInt() ==
            expr->CallNewFeedbackSlot().ToInt() + 1);
     */
   }
 
   __ LoadObject(x2, FeedbackVector());
   __ Mov(x3, SmiFromSlot(expr->CallFeedbackSlot()));
 
-  // TODO(dslomov): use a different stub and propagate new.target.
-  CallConstructStub stub(isolate(), RECORD_CONSTRUCTOR_TARGET);
+  CallConstructStub stub(isolate(), SUPER_CALL_RECORD_TARGET);
   __ Call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
 
+  __ Drop(1);
+
   RecordJSReturnSite(expr);
 
   EmitVariableAssignment(this_var, Token::INIT_CONST);
   context()->Plug(x0);
 }
 
 
 void FullCodeGenerator::EmitIsSmi(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 1);
@@ skipping 2400 matching lines @@
   return previous_;
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64