After a run command, breakpoints in systemlib did not fire because systemlib.php does not get reloaded. Now get the run command to reapply the breakpoints. Also fixed the caching of the source of systemlib.php to not check for the debugger flag before the flag has been set. Finally, fixed a race condition where compiling a string/file to a unit will fail to update the repo with the unit because another thread has already written a unit with the same hash to the repo. In such cases, the losing unit is unable to retrieve source information because that only lives in the repo.
After a rebuild, the first run of the run/tests tests/quick/debugger/list.php invariably fails on developer machines. It passes if run again, or if another debugger test has passed before it has run.
The debugger can only hit breakpoints and list source lines for code lines that have an entry in the byte code repository. In order to make systemlib.php debuggable, it needs an entry. A customized routine has been created for doing this since there is no actual source file available. Also, special case logic is needed to list the source file during debugging.
Herman Venter