@Override
			public void postMatchApply(MatchAction[] actions, Address addr) {
				// Actions might have set context, check if postcondition failed first
				if (!postreqFailedResult.contains(addr)) {
					setCurrentContext(program, addr);
				}
				// get rid of the context list.
				contextValueList = null;
			}
Get an existing function right above the addr.
@param program program to check
@param addr address to check
@return true if there is an existing function above addr
Ghidra/Features/BytePatterns/src/main/java/ghidra/app/analyzers/FunctionStartAnalyzer.java