[stubs] Port FastNewObjectStub to TF

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index 6f876a49c465888a6902e2b8b8e3eb027087b39a..a9a8ec387997aafca82da880b1914b7e3ddb08be 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -3268,132 +3268,6 @@ void InternalArrayConstructorStub::Generate(MacroAssembler* masm) {
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
-
-void FastNewObjectStub::Generate(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- rdi    : target
-  //  -- rdx    : new target
-  //  -- rsi    : context
-  //  -- rsp[0] : return address
-  // -----------------------------------
-  __ AssertFunction(rdi);
-  __ AssertReceiver(rdx);
-
-  // Verify that the new target is a JSFunction.
-  Label new_object;
-  __ CmpObjectType(rdx, JS_FUNCTION_TYPE, rbx);
-  __ j(not_equal, &new_object);
-
-  // Load the initial map and verify that it's in fact a map.
-  __ movp(rcx, FieldOperand(rdx, JSFunction::kPrototypeOrInitialMapOffset));
-  __ JumpIfSmi(rcx, &new_object);
-  __ CmpObjectType(rcx, MAP_TYPE, rbx);
-  __ j(not_equal, &new_object);
-
-  // Fall back to runtime if the target differs from the new target's
-  // initial map constructor.
-  __ cmpp(rdi, FieldOperand(rcx, Map::kConstructorOrBackPointerOffset));
-  __ j(not_equal, &new_object);
-
-  // Allocate the JSObject on the heap.
-  Label allocate, done_allocate;
-  __ movzxbl(rbx, FieldOperand(rcx, Map::kInstanceSizeOffset));
-  __ leal(rbx, Operand(rbx, times_pointer_size, 0));
-  __ Allocate(rbx, rax, rdi, no_reg, &allocate, NO_ALLOCATION_FLAGS);
-  __ bind(&done_allocate);
-
-  // Initialize the JSObject fields.
-  __ movp(FieldOperand(rax, JSObject::kMapOffset), rcx);
-  __ LoadRoot(rbx, Heap::kEmptyFixedArrayRootIndex);
-  __ movp(FieldOperand(rax, JSObject::kPropertiesOffset), rbx);
-  __ movp(FieldOperand(rax, JSObject::kElementsOffset), rbx);
-  STATIC_ASSERT(JSObject::kHeaderSize == 3 * kPointerSize);
-  __ leap(rbx, FieldOperand(rax, JSObject::kHeaderSize));
-
-  // ----------- S t a t e -------------
-  //  -- rax    : result (tagged)
-  //  -- rbx    : result fields (untagged)
-  //  -- rdi    : result end (untagged)
-  //  -- rcx    : initial map
-  //  -- rsi    : context
-  //  -- rsp[0] : return address
-  // -----------------------------------
-
-  // Perform in-object slack tracking if requested.
-  Label slack_tracking;
-  STATIC_ASSERT(Map::kNoSlackTracking == 0);
-  __ LoadRoot(r11, Heap::kUndefinedValueRootIndex);
-  __ testl(FieldOperand(rcx, Map::kBitField3Offset),
-           Immediate(Map::ConstructionCounter::kMask));
-  __ j(not_zero, &slack_tracking, Label::kNear);
-  {
-    // Initialize all in-object fields with undefined.
-    __ InitializeFieldsWithFiller(rbx, rdi, r11);
-    __ Ret();
-  }
-  __ bind(&slack_tracking);
-  {
-    // Decrease generous allocation count.
-    STATIC_ASSERT(Map::ConstructionCounter::kNext == 32);
-    __ subl(FieldOperand(rcx, Map::kBitField3Offset),
-            Immediate(1 << Map::ConstructionCounter::kShift));
-
-    // Initialize the in-object fields with undefined.
-    __ movzxbl(rdx, FieldOperand(rcx, Map::kUnusedPropertyFieldsOffset));
-    __ negp(rdx);
-    __ leap(rdx, Operand(rdi, rdx, times_pointer_size, 0));
-    __ InitializeFieldsWithFiller(rbx, rdx, r11);
-
-    // Initialize the remaining (reserved) fields with one pointer filler map.
-    __ LoadRoot(r11, Heap::kOnePointerFillerMapRootIndex);
-    __ InitializeFieldsWithFiller(rdx, rdi, r11);
-
-    // Check if we can finalize the instance size.
-    Label finalize;
-    STATIC_ASSERT(Map::kSlackTrackingCounterEnd == 1);
-    __ testl(FieldOperand(rcx, Map::kBitField3Offset),
-             Immediate(Map::ConstructionCounter::kMask));
-    __ j(zero, &finalize, Label::kNear);
-    __ Ret();
-
-    // Finalize the instance size.
-    __ bind(&finalize);
-    {
-      FrameScope scope(masm, StackFrame::INTERNAL);
-      __ Push(rax);
-      __ Push(rcx);
-      __ CallRuntime(Runtime::kFinalizeInstanceSize);
-      __ Pop(rax);
-    }
-    __ Ret();
-  }
-
-  // Fall back to %AllocateInNewSpace.
-  __ bind(&allocate);
-  {
-    FrameScope scope(masm, StackFrame::INTERNAL);
-    __ Integer32ToSmi(rbx, rbx);
-    __ Push(rcx);
-    __ Push(rbx);
-    __ CallRuntime(Runtime::kAllocateInNewSpace);
-    __ Pop(rcx);
-  }
-  __ movzxbl(rbx, FieldOperand(rcx, Map::kInstanceSizeOffset));
-  __ leap(rdi, Operand(rax, rbx, times_pointer_size, 0));
-  STATIC_ASSERT(kHeapObjectTag == 1);
-  __ decp(rdi);  // Remove the tag from the end address.
-  __ jmp(&done_allocate);
-
-  // Fall back to %NewObject.
-  __ bind(&new_object);
-  __ PopReturnAddressTo(rcx);
-  __ Push(rdi);
-  __ Push(rdx);
-  __ PushReturnAddressFrom(rcx);
-  __ TailCallRuntime(Runtime::kNewObject);
-}
-
-
 void FastNewRestParameterStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- rdi    : function