public DebugInfoEntry getParentOf(int dieIndex) {
		int parentIndex = parentIndexes[dieIndex];
		return parentIndex >= 0 ? getDIEByIndex(parentIndex) : null;
	}
Returns the parent DIE of the specified (by index) DIE

@param dieIndex index of a DIE record
@return parent DIE, or null if no parent (eg. root DIE)
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/DWARFProgram.java