@Override
	public String toString() {
		StringBuilder sb = new StringBuilder("[ctx(" + startbit + "," + endbit + ")");
		if (signbit) {
			sb.append(", signed");
		}
		sb.append(", bytes " + startbyte + "-" + endbyte);
		sb.append(", shift=" + shift);
		sb.append("]");
		return sb.toString();
	}
Build a long from the context bytes at the current point in the instruction parse
@param walker is the parsing state
@return the recover value
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/processors/sleigh/expression/ContextField.java