signatureToTypeMap.put(SpecialTypeSignatures.RETURN_ADDRESS_TYPE_SIGNATURE, returnAddressType = new ReturnAddressType());
	private void addSpecialTypes() {		signatureToTypeMap.put(SpecialTypeSignatures.NULL_TYPE_SIGNATURE, nullType = new NullType());		signatureToTypeMap.put(SpecialTypeSignatures.TOP_TYPE_SIGNATURE, topType = new TopType());		signatureToTypeMap.put(SpecialTypeSignatures.BOTTOM_TYPE_SIGNATURE, bottomType = new BottomType());		signatureToTypeMap.put(SpecialTypeSignatures.LONG_EXTRA_TYPE_SIGNATURE, longExtraType = new LongExtraType());		signatureToTypeMap.put(SpecialTypeSignatures.DOUBLE_EXTRA_TYPE_SIGNATURE, doubleExtraType = new DoubleExtraType());	}