645     uint32_t toShift = count - numShifted;  in tryUnshiftDenseElements()  local
646     MOZ_ASSERT(toShift <= ObjectElements::MaxShiftedElements,  in tryUnshiftDenseElements()
650     if (toShift > unusedCapacity) {  in tryUnshiftDenseElements()
656     toShift = std::min(toShift + unusedCapacity / 2, unusedCapacity);  in tryUnshiftDenseElements()
659     if (numShifted + toShift > ObjectElements::MaxShiftedElements) {  in tryUnshiftDenseElements()
660       toShift = ObjectElements::MaxShiftedElements - numShifted;  in tryUnshiftDenseElements()
663     MOZ_ASSERT(count <= numShifted + toShift);  in tryUnshiftDenseElements()
664     MOZ_ASSERT(numShifted + toShift <= ObjectElements::MaxShiftedElements);  in tryUnshiftDenseElements()
665     MOZ_ASSERT(toShift <= unusedCapacity);  in tryUnshiftDenseElements()
669     setDenseInitializedLength(initLen + toShift);  in tryUnshiftDenseElements()
670     for (uint32_t i = 0; i < toShift; i++) {  in tryUnshiftDenseElements()
673     moveDenseElements(toShift, 0, initLen);  in tryUnshiftDenseElements()
676     shiftDenseElementsUnchecked(toShift);  in tryUnshiftDenseElements()
680     MOZ_ASSERT(header->numShiftedElements() == numShifted + toShift);  in tryUnshiftDenseElements()