[stubs] Port FastNewObjectStub to TF

src/arm64/code-stubs-arm64.cc

Index: src/arm64/code-stubs-arm64.cc
diff --git a/src/arm64/code-stubs-arm64.cc b/src/arm64/code-stubs-arm64.cc
index 3d6133b7010ef16c254a20121f3dbdd9e55b887b..54c28337ba6012168aedc27bf59b6847c61a846f 100644
--- a/src/arm64/code-stubs-arm64.cc
+++ b/src/arm64/code-stubs-arm64.cc
@@ -3636,127 +3636,6 @@ void InternalArrayConstructorStub::Generate(MacroAssembler* masm) {
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
-
-void FastNewObjectStub::Generate(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- x1 : target
-  //  -- x3 : new target
-  //  -- cp : context
-  //  -- lr : return address
-  // -----------------------------------
-  __ AssertFunction(x1);
-  __ AssertReceiver(x3);
-
-  // Verify that the new target is a JSFunction.
-  Label new_object;
-  __ JumpIfNotObjectType(x3, x2, x2, JS_FUNCTION_TYPE, &new_object);
-
-  // Load the initial map and verify that it's in fact a map.
-  __ Ldr(x2, FieldMemOperand(x3, JSFunction::kPrototypeOrInitialMapOffset));
-  __ JumpIfSmi(x2, &new_object);
-  __ JumpIfNotObjectType(x2, x0, x0, MAP_TYPE, &new_object);
-
-  // Fall back to runtime if the target differs from the new target's
-  // initial map constructor.
-  __ Ldr(x0, FieldMemOperand(x2, Map::kConstructorOrBackPointerOffset));
-  __ CompareAndBranch(x0, x1, ne, &new_object);
-
-  // Allocate the JSObject on the heap.
-  Label allocate, done_allocate;
-  __ Ldrb(x4, FieldMemOperand(x2, Map::kInstanceSizeOffset));
-  __ Allocate(x4, x0, x5, x6, &allocate, SIZE_IN_WORDS);
-  __ Bind(&done_allocate);
-
-  // Initialize the JSObject fields.
-  STATIC_ASSERT(JSObject::kMapOffset == 0 * kPointerSize);
-  __ Str(x2, FieldMemOperand(x0, JSObject::kMapOffset));
-  __ LoadRoot(x3, Heap::kEmptyFixedArrayRootIndex);
-  STATIC_ASSERT(JSObject::kPropertiesOffset == 1 * kPointerSize);
-  STATIC_ASSERT(JSObject::kElementsOffset == 2 * kPointerSize);
-  __ Str(x3, FieldMemOperand(x0, JSObject::kPropertiesOffset));
-  __ Str(x3, FieldMemOperand(x0, JSObject::kElementsOffset));
-  STATIC_ASSERT(JSObject::kHeaderSize == 3 * kPointerSize);
-  __ Add(x1, x0, Operand(JSObject::kHeaderSize - kHeapObjectTag));
-
-  // ----------- S t a t e -------------
-  //  -- x0 : result (tagged)
-  //  -- x1 : result fields (untagged)
-  //  -- x5 : result end (untagged)
-  //  -- x2 : initial map
-  //  -- cp : context
-  //  -- lr : return address
-  // -----------------------------------
-
-  // Perform in-object slack tracking if requested.
-  Label slack_tracking;
-  STATIC_ASSERT(Map::kNoSlackTracking == 0);
-  __ LoadRoot(x6, Heap::kUndefinedValueRootIndex);
-  __ Ldr(w3, FieldMemOperand(x2, Map::kBitField3Offset));
-  __ TestAndBranchIfAnySet(w3, Map::ConstructionCounter::kMask,
-                           &slack_tracking);
-  {
-    // Initialize all in-object fields with undefined.
-    __ InitializeFieldsWithFiller(x1, x5, x6);
-    __ Ret();
-  }
-  __ Bind(&slack_tracking);
-  {
-    // Decrease generous allocation count.
-    STATIC_ASSERT(Map::ConstructionCounter::kNext == 32);
-    __ Sub(w3, w3, 1 << Map::ConstructionCounter::kShift);
-    __ Str(w3, FieldMemOperand(x2, Map::kBitField3Offset));
-
-    // Initialize the in-object fields with undefined.
-    __ Ldrb(x4, FieldMemOperand(x2, Map::kUnusedPropertyFieldsOffset));
-    __ Sub(x4, x5, Operand(x4, LSL, kPointerSizeLog2));
-    __ InitializeFieldsWithFiller(x1, x4, x6);
-
-    // Initialize the remaining (reserved) fields with one pointer filler map.
-    __ LoadRoot(x6, Heap::kOnePointerFillerMapRootIndex);
-    __ InitializeFieldsWithFiller(x1, x5, x6);
-
-    // Check if we can finalize the instance size.
-    Label finalize;
-    STATIC_ASSERT(Map::kSlackTrackingCounterEnd == 1);
-    __ TestAndBranchIfAllClear(w3, Map::ConstructionCounter::kMask, &finalize);
-    __ Ret();
-
-    // Finalize the instance size.
-    __ Bind(&finalize);
-    {
-      FrameScope scope(masm, StackFrame::INTERNAL);
-      __ Push(x0, x2);
-      __ CallRuntime(Runtime::kFinalizeInstanceSize);
-      __ Pop(x0);
-    }
-    __ Ret();
-  }
-
-  // Fall back to %AllocateInNewSpace.
-  __ Bind(&allocate);
-  {
-    FrameScope scope(masm, StackFrame::INTERNAL);
-    STATIC_ASSERT(kSmiTag == 0);
-    STATIC_ASSERT(kSmiTagSize == 1);
-    __ Mov(x4,
-           Operand(x4, LSL, kPointerSizeLog2 + kSmiTagSize + kSmiShiftSize));
-    __ Push(x2, x4);
-    __ CallRuntime(Runtime::kAllocateInNewSpace);
-    __ Pop(x2);
-  }
-  __ Ldrb(x5, FieldMemOperand(x2, Map::kInstanceSizeOffset));
-  __ Add(x5, x0, Operand(x5, LSL, kPointerSizeLog2));
-  STATIC_ASSERT(kHeapObjectTag == 1);
-  __ Sub(x5, x5, kHeapObjectTag);  // Subtract the tag from end.
-  __ B(&done_allocate);
-
-  // Fall back to %NewObject.
-  __ Bind(&new_object);
-  __ Push(x1, x3);
-  __ TailCallRuntime(Runtime::kNewObject);
-}
-
-
 void FastNewRestParameterStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- x1 : function