PR# 13734 Class invariants inherited from ANY not checked
Problem Report Summary
Submitter: prestoat2000
Category: Runtime
Priority: Medium
Date: 2007/12/08
Class: Bug
Severity: Serious
Number: 13734
Release: 6.1.71367
Confidential: No
Status: Analyzed
Responsible: manus_eiffel
Environment: Mozilla/5.0 (X11; U; SunOS i86pc; en-US; rv:1.8.1.5) Gecko/20070719 Firefox/2.0.0.5
Solaris 10 on x86
Synopsis: Class invariants inherited from ANY not checked
Description
Class invariants inherited from ANY are not checked when .ecf file requests
checking of invariants and use_application_options="true" for base library.
Supplied test case redefines {ANY}.conforms_to so that it always returns
False to demonstrate this.
I found this bug after noticing the following line in both plug.c and
interp.c
if (dtype <= 0) return; /* ANY does not have invariants */
To Reproduce
Compile with attached files and execute system. Invariants inherited from ANY are not checked.
Problem Report Interactions
The reason for it is that in theory `conforms_to' should be frozen and the invariants should always hold anyway. As a result, this code is an optimization to not check ANY's invariant all the time. I'll make sure that `conforms_to' becomes frozen in ELKS.