@Override
	public FunctionSignature getSignature(boolean formalSignature) {
		manager.lock.acquire();
		try {
			startUpdate();
			checkIsValid();
			if (thunkedFunction == null) {
				// If not a thunk be sure to load variables first
				loadVariables();
			}
			return new FunctionDefinitionDataType(this, formalSignature);
		}
		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