@Override
	public void setReturnType(DataType type, SourceType source) throws InvalidInputException {
		manager.lock.acquire();
		try {
			startUpdate();
			checkDeleted();
			if (thunkedFunction != null) {
				thunkedFunction.setReturnType(type, source);
				return;
			}
			getReturn().setDataType(type, source);
		}
		finally {
			endUpdate();
			manager.lock.release();
		}
	}
Use of stack frame to compute parameter ordinals and validate stack offsets
should not be done while <code>validateEnabled</code> is false.  This may be
necessary during a language upgrade in which case a dummy compiler-spec
may be in-use.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/function/FunctionDB.java