code for udacity course CS259 Software Debugging

• The solution provide by the udacity course, hmm, tricky.
• Assert(quote in ["'",'"',False]).
• ' and " implicitly means true, thus the quote(' or ") sign can be stored in varable quote.

Stop and save the current state (frame.f_locals) to a global var('the_state') if some condition is satistied.

Stop and change the current state (frame.f_locals) according to a global var('the_diff') if some condition is satistied. Changing frame.f_locals is some kind of tricky, use update.

• Need a pass case and a fail case.
• Use get_state to get their state in given line/iteration. Compute the diff::[(varName,fail_val)]. The cause of failure must be a subset of diff.
• Use ddmin(delta debug minimize) to find the minimum set of vars,vals pair make the test fail, for each given line/iteration.
• Print the var,fail_val pairs in order of line/iteration. That is the cause chain.

Calculates phi coefficients for each code line. Then display the result as a table.

Calculates phi coefficients for each function and return vaule category. Then display the result as a table.

Add delete command to my_spyder.py, can delete breakpoints and watchpoints now.

Revise watchpoint feature of my_spyder

• A fully automated program that can display the cause-effect chain automatically.
• Enhenced version of 4_make_it_work.py 4_make_it_work.py need provided line/iterations, which makes it not very useful; This program record covered line in order of their execution, and use them as line/iterations. (Saidly, strange error occurs after submition, though give the right result ... ; The grader of a debugger has a bug ?)