Lecture 20: November 8, 2019

Reading: Handout, The Dynamic Debugger gdb
Due: Homework #3, due November 8, 2019

1. Greetings and felicitations!
   1. Homework
      1. Homework 1 grades are out
      2. Homework 3: submit through Gradescope
      3. Homework 2 is now reopened until Wednesday so you can fix things that you lost points for on homework 1
   2. In discussion section, ask questions of the TAs — they are there to help! And when they ask something, try to answer.
   3. Some errors by the TAs and me are because we’re human; others are deliberate, to see who will spot it; this tells us if we need to cover something more thoroughly
   4. If you get a message like “Attempted stack smashing”, look at your local arrays; it probably means you overflowed one of them
2. Static debugging
   1. How to narrow down where the problem is using printf [sample1.c, sample2.c]
   2. Handle multiple bugs [sample3.c]
3. Dynamic debugging with gdb [sample1.c, sample2.c, sample3.c, nfact2.c]
   1. Bringing a program into gdb
   2. Breakpoints, conditions, commands
   3. Stepping through it
   4. Printing values
   5. Watchpoints

Matt Bishop Office: 2209 Watershed Sciences Phone: +1 (530) 752-8060 Email: [email protected]

ECS 36A, Programming and Problem Solving Version of November 15, 2019 at 9:29PM

You can also obtain a PDF version of this.