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

src/mips/code-stubs-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.
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 2581 matching lines @@
   CallFunctionNoFeedback(masm, argc(), NeedsChecks(), CallAsMethod());
 }
 
 
 void CallConstructStub::Generate(MacroAssembler* masm) {
   // a0 : number of arguments
   // a1 : the function to call
   // a2 : feedback vector
   // a3 : slot in feedback vector (Smi, for RecordCallTarget)
   // t0 : original constructor (for IsSuperConstructorCall)
-  Label slow, non_function_call;
 
+  Label non_function;
   // Check that the function is not a smi.
-  __ JumpIfSmi(a1, &non_function_call);
+  __ JumpIfSmi(a1, &non_function);
   // Check that the function is a JSFunction.
   __ GetObjectType(a1, t1, t1);
-  __ Branch(&slow, ne, t1, Operand(JS_FUNCTION_TYPE));
+  __ Branch(&non_function, ne, t1, Operand(JS_FUNCTION_TYPE));
 
   if (RecordCallTarget()) {
     GenerateRecordCallTarget(masm, IsSuperConstructorCall());
 
     __ sll(at, a3, kPointerSizeLog2 - kSmiTagSize);
     __ Addu(t1, a2, at);
     Label feedback_register_initialized;
     // Put the AllocationSite from the feedback vector into a2, or undefined.
     __ lw(a2, FieldMemOperand(t1, FixedArray::kHeaderSize));
     __ lw(t1, FieldMemOperand(a2, AllocationSite::kMapOffset));
     __ LoadRoot(at, Heap::kAllocationSiteMapRootIndex);
     __ Branch(&feedback_register_initialized, eq, t1, Operand(at));
     __ LoadRoot(a2, Heap::kUndefinedValueRootIndex);
     __ bind(&feedback_register_initialized);
 
     __ AssertUndefinedOrAllocationSite(a2, t1);
   }
 
   // Pass function as original constructor.
   if (IsSuperConstructorCall()) {
     __ mov(a3, t0);
   } else {
     __ mov(a3, a1);
   }
 
-  // Jump to the function-specific construct stub.
-  Register jmp_reg = t0;
-  __ lw(jmp_reg, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
-  __ lw(jmp_reg, FieldMemOperand(jmp_reg,
-                                 SharedFunctionInfo::kConstructStubOffset));
-  __ Addu(at, jmp_reg, Operand(Code::kHeaderSize - kHeapObjectTag));
+  // Tail call to the function-specific construct stub (still in the caller
+  // context at this point).
+  __ lw(t0, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
+  __ lw(t0, FieldMemOperand(t0, SharedFunctionInfo::kConstructStubOffset));
+  __ Addu(at, t0, Operand(Code::kHeaderSize - kHeapObjectTag));
   __ Jump(at);
 
-  // a0: number of arguments
-  // a1: called object
-  // t1: object type
-  __ bind(&slow);
-  {
-    __ Branch(&non_function_call, ne, t1, Operand(JS_FUNCTION_PROXY_TYPE));
-    // TODO(neis): This doesn't match the ES6 spec for [[Construct]] on proxies.
-    __ lw(a1, FieldMemOperand(a1, JSFunctionProxy::kConstructTrapOffset));
-    __ Jump(isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
-
-    __ bind(&non_function_call);
-    {
-      // Determine the delegate for the target (if any).
-      FrameScope scope(masm, StackFrame::INTERNAL);
-      __ SmiTag(a0);
-      __ Push(a0, a1);
-      __ CallRuntime(Runtime::kGetConstructorDelegate, 1);
-      __ mov(a1, v0);
-      __ Pop(a0);
-      __ SmiUntag(a0);
-    }
-    // The delegate is always a regular function.
-    __ AssertFunction(a1);
-    __ Jump(masm->isolate()->builtins()->CallFunction(),
-            RelocInfo::CODE_TARGET);
-  }
+  __ bind(&non_function);
+  __ mov(a3, a1);
+  __ Jump(isolate()->builtins()->Construct(), RelocInfo::CODE_TARGET);
 }
 
 
 static void EmitLoadTypeFeedbackVector(MacroAssembler* masm, Register vector) {
   __ lw(vector, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
   __ lw(vector, FieldMemOperand(vector,
                                 JSFunction::kSharedFunctionInfoOffset));
   __ lw(vector, FieldMemOperand(vector,
                                 SharedFunctionInfo::kFeedbackVectorOffset));
 }
@@ skipping 3070 matching lines @@
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS