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Jeff.Lu
Jeff.Lu

Reputation: 576

How to pass the repeat count to x command in GDB

The x command can examine memory in GDB. Like 

x/4xg 0x60400

Now I am going to define my own x comand which examines memory with specified repeat count, like:

define myXCommand
    set var &repeatCount=$arg0
    x/(???)xg 0x60400
end

I have tried many ways to pass the variant repeatCount to x command, but I failed finally. My problem is how to pass the repeat count to x command? Appreciated very much if anyone can help.

Upvotes: 1

Views: 528

Answers (1)

Mark Plotnick
Mark Plotnick

Reputation: 10271

A convenience variable can be used in most expressions, but the x command only allows the repeat count to be a string of digits, not an arbitrary expression.

What you can do is use the eval command, which does a printf on its arguments and then runs the result as a command.

define myXCommand
    set var $repeatCount=$arg0
    eval "x/%dxg 0x60400", $repeatCount
end

Upvotes: 2

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