[builtins] Add support for NewTarget to Execution::New.

src/arm/code-stubs-arm.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.
 
 #if V8_TARGET_ARCH_ARM
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 2452 matching lines @@
   CallFunctionNoFeedback(masm, argc(), NeedsChecks(), CallAsMethod());
 }
 
 
 void CallConstructStub::Generate(MacroAssembler* masm) {
   // r0 : number of arguments
   // r1 : the function to call
   // r2 : feedback vector
   // r3 : slot in feedback vector (Smi, for RecordCallTarget)
   // r4 : original constructor (for IsSuperConstructorCall)
-  Label slow, non_function_call;
 
+  Label non_function;
   // Check that the function is not a smi.
-  __ JumpIfSmi(r1, &non_function_call);
+  __ JumpIfSmi(r1, &non_function);
   // Check that the function is a JSFunction.
   __ CompareObjectType(r1, r5, r5, JS_FUNCTION_TYPE);
-  __ b(ne, &slow);
+  __ b(ne, &non_function);
 
   if (RecordCallTarget()) {
     GenerateRecordCallTarget(masm, IsSuperConstructorCall());
 
     __ add(r5, r2, Operand::PointerOffsetFromSmiKey(r3));
     Label feedback_register_initialized;
     // Put the AllocationSite from the feedback vector into r2, or undefined.
     __ ldr(r2, FieldMemOperand(r5, FixedArray::kHeaderSize));
     __ ldr(r5, FieldMemOperand(r2, AllocationSite::kMapOffset));
     __ CompareRoot(r5, Heap::kAllocationSiteMapRootIndex);
     __ b(eq, &feedback_register_initialized);
     __ LoadRoot(r2, Heap::kUndefinedValueRootIndex);
     __ bind(&feedback_register_initialized);
 
     __ AssertUndefinedOrAllocationSite(r2, r5);
   }
 
   // Pass function as original constructor.
   if (IsSuperConstructorCall()) {
     __ mov(r3, r4);
   } else {
     __ mov(r3, r1);
   }
 
-  // Jump to the function-specific construct stub.
-  Register jmp_reg = r4;
-  __ ldr(jmp_reg, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
-  __ ldr(jmp_reg, FieldMemOperand(jmp_reg,
-                                  SharedFunctionInfo::kConstructStubOffset));
-  __ add(pc, jmp_reg, Operand(Code::kHeaderSize - kHeapObjectTag));
+  // Tail call to the function-specific construct stub (still in the caller
+  // context at this point).
+  __ ldr(r4, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
+  __ ldr(r4, FieldMemOperand(r4, SharedFunctionInfo::kConstructStubOffset));
+  __ add(pc, r4, Operand(Code::kHeaderSize - kHeapObjectTag));
 
-  // r0: number of arguments
-  // r1: called object
-  // r5: object type
-  __ bind(&slow);
-  {
-    __ cmp(r5, Operand(JS_FUNCTION_PROXY_TYPE));
-    __ b(ne, &non_function_call);
-    // TODO(neis): This doesn't match the ES6 spec for [[Construct]] on proxies.
-    __ ldr(r1, FieldMemOperand(r1, JSFunctionProxy::kConstructTrapOffset));
-    __ Jump(isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
-
-    __ bind(&non_function_call);
-    {
-      // Determine the delegate for the target (if any).
-      FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
-      __ SmiTag(r0);
-      __ Push(r0, r1);
-      __ CallRuntime(Runtime::kGetConstructorDelegate, 1);
-      __ mov(r1, r0);
-      __ Pop(r0);
-      __ SmiUntag(r0);
-    }
-    // The delegate is always a regular function.
-    __ AssertFunction(r1);
-    __ Jump(masm->isolate()->builtins()->CallFunction(),
-            RelocInfo::CODE_TARGET);
-  }
+  __ bind(&non_function);
+  __ mov(r3, r1);
+  __ Jump(isolate()->builtins()->Construct(), RelocInfo::CODE_TARGET);
 }
 
 
 static void EmitLoadTypeFeedbackVector(MacroAssembler* masm, Register vector) {
   __ ldr(vector, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
   __ ldr(vector, FieldMemOperand(vector,
                                  JSFunction::kSharedFunctionInfoOffset));
   __ ldr(vector, FieldMemOperand(vector,
                                  SharedFunctionInfo::kFeedbackVectorOffset));
 }
@@ skipping 3001 matching lines @@
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM