Advanced Mac OS X Programming: The Big Nerd Ranch Guide

Stack Traces

You can see a stack trace, that is, all of the currently active functions, with the where command (also backtrace and bt). It will show you the stack frames currently active:

(​g​d​b​)​ ​w​h​e​r​e​
#​0​ ​ ​0​x​0​0​0​0​7​f​f​f​8​2​f​7​a​1​2​0​ ​i​n​ ​s​t​r​l​e​n​ ​(​)​
#​1​ ​ ​0​x​0​0​0​0​7​f​f​f​8​2​f​8​5​b​1​c​ ​i​n​ ​_​_​v​f​p​r​i​n​t​f​ ​(​)​
#​2​ ​ ​0​x​0​0​0​0​7​f​f​f​8​2​f​c​6​d​c​b​ ​i​n​ ​v​f​p​r​i​n​t​f​_​l​ ​(​)​
#​3​ ​ ​0​x​0​0​0​0​7​f​f​f​8​2​f​f​4​4​8​3​ ​i​n​ ​p​r​i​n​t​f​ ​(​)​
#​4​ ​ ​0​x​0​0​0​0​0​0​0​1​0​0​0​0​0​d​e​c​ ​i​n​ ​m​a​i​n​ ​(​a​r​g​c​=​2​,​ ​a​r​g​v​=​0​x​7​f​f​f​5​f​b​f​f​2​4​0​)​ ​a​t​ ​m​e​m​e​r​r​o​r​.​m​:​8​2​

The bottom-most frame, main() in this case, is termed the “innermost” stack frame. The ...