private static InstDBAdapter findReadOnlyAdapter(DBHandle handle, AddressMap addrMap)
			throws VersionException, IOException {
		try {
			return new InstDBAdapterV1(handle, addrMap.getOldAddressMap(), false);
		}
		catch (VersionException e) {
		}

		return new InstDBAdapterV0(handle, addrMap);
	}
Adapter that accesses the instruction table.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/code/InstDBAdapter.java