CODEWITHSUNDEEP
linuxdebugginggdb
Xi Duan
Xi Duan

Reputation: 103

How to run previous instructions in GDB?

Here I want to ask this question. When I am debugging a program, sometimes I wish I can run a previous instruction again. Like in Microsoft Visual Studio, we can drag the position indicator (remember the yellow arrow) to the previous instruction you want to locate.

For example:

My program is currently at line 72, and suppose line 70 is in the same function that line 72 sits in. Now I want to re-run line 70 again. Is there any way to do that?

Thanks.

Upvotes: 3

Views: 10222

Answers (3)

LM Jennings
LM Jennings

Reputation: 1

Use gdb command jump, e.g.:

jump 70

Upvotes: 0

Employed Russian
Employed Russian

Reputation: 213955

I want to re-run line 70 again

Use the GDB jump command.

Upvotes: 6

Dan Fego
Dan Fego

Reputation: 14034

You can normally call functions within gdb with the call command:

(gdb) call some_function(arg1, arg2);

However, if you want to specifically go back the program, you could always find the memory location of the line in question and set the instruction pointer to it.

(gdb) set $eip = <some memory address>

That being said, I don't know of a way to fully "unwind" the program's state, if that's what Visual Studio does. In other words, any other program state may be different the second time through.

Upvotes: 1

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