protected void onMissingUseropDef(PcodeOp op, PcodeFrame frame, String opName,
			PcodeUseropLibrary<T> library) {
		throw new SleighLinkException(
			"Sleigh userop '" + opName + "' is not in the library " + library);
	}
Extension point: Behavior when a userop definition was not found in the library

<p>
The default behavior is to throw a {@link SleighLinkException}.

@param op the op
@param frame the frame
@param opName the name of the p-code userop
@param library the library
Ghidra/Framework/Emulation/src/main/java/ghidra/pcode/exec/PcodeExecutor.java