Debuggers: Difference between revisions
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Created page with '= Debuggers = == Advantages/Disadvantages == * Advantages ** Single step through the code ** Stop execution at a given point to investigate where it goes and what the values ar…' |
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On a linux command line, type: <code>ddd pathToYourExecutable/yourExecutable &</code> | On a linux command line, type: <code>ddd pathToYourExecutable/yourExecutable &</code> | ||
Do not specify command line options at this point. That will be done later when you type [[Debuggers#Run with options|"run"]] | |||
=== How to Use DDD === | === How to Use DDD === | ||
[[Image:DddScreenshot.jpg|400px | ==== Debugging Tools ==== | ||
*'''Run:''' start the program with the previously specified options | |||
*'''Interrupt:''' stop the program from running | |||
*'''Step:''' Go into the function call (or go to next line of code) | |||
*'''Next:''' Go over a function call (execute it, but do not step into it) | |||
*'''Finish:''' Continue execution until the end of the current method | |||
*'''Cont:''' Continue execution until the next breakpoint or the end of the program is reached. | |||
*'''Kill:''' stop the program from running. | |||
[[Image:DddScreenshot.jpg|400px|ddd Screenshot]] | |||
==== Basic Usage ==== | |||
===== Bring up a file in the viewer ===== | |||
* At the gdb prompt: | |||
*: <code>l <filename>:<line#></code> | |||
*: -or - | |||
*:<code> l <class>::<method></code> | |||
Examples: | |||
: <code>l SamRecord.cpp:1</code> | |||
:<code> l SamRecord::getCigar</code> | |||
===== Set a breakpoint ===== | |||
* Use mouse right-click on the line number | |||
*:Set Breakpoint (can set properties – break after hit X number of times, etc) | |||
:-or- | |||
* At the gddb prompt: | |||
*:<code>b <class>::<method></code> | |||
===== Attach to already running process ===== | |||
*File->Attach to Process | |||
Revision as of 12:13, 29 April 2011
Debuggers
Advantages/Disadvantages
- Advantages
- Single step through the code
- Stop execution at a given point to investigate where it goes and what the values are
- Attach to an already running program
- Disadvantages
- Not running real-time, so may not expose all problems
DDD
How to Compile for Debug
Compile with the option: -ggdb -O0
For the statgen library, you can compile with: make OPTFLAG="-ggdb -O0"
How to Start DDD
On a linux command line, type: ddd pathToYourExecutable/yourExecutable &
Do not specify command line options at this point. That will be done later when you type "run"
How to Use DDD
Debugging Tools
- Run: start the program with the previously specified options
- Interrupt: stop the program from running
- Step: Go into the function call (or go to next line of code)
- Next: Go over a function call (execute it, but do not step into it)
- Finish: Continue execution until the end of the current method
- Cont: Continue execution until the next breakpoint or the end of the program is reached.
- Kill: stop the program from running.
Basic Usage
Bring up a file in the viewer
- At the gdb prompt:
l <filename>:<line#>- -or -
l <class>::<method>
Examples:
l SamRecord.cpp:1l SamRecord::getCigar
Set a breakpoint
- Use mouse right-click on the line number
- Set Breakpoint (can set properties – break after hit X number of times, etc)
- -or-
- At the gddb prompt:
b <class>::<method>
Attach to already running process
- File->Attach to Process
