Analyze with valgrind only some functions and subfunctions

I want to debug a "big" C code, and use valgrind, in particular the tool memcheck. The output is very long, due to the size of the program, and I only want to focus on some function and relative subfunctions of the program. Is it possible in valgrind only to analyze certain function and subfun开发者_如何学Pythonctions (up to some depth level)?

Thanks

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Valgrind must supervise the process from the start; it is not possible to attach it to already running process (or, equivalently, to ignore the process until some point in execution, then start emulating/checking).

The reverse is not true -- you can "detach" valgrind after some number of instructions; but I am guessing that's not what you want.

Please note that:

• the "output is very long" is a poor excuse -- Valgrind errors are usually true positives (unless you are using optimized code, in which case: don't do that), and should really be addressed, and
• you can concentrate on the more serious problems (heap corruption) before addressing the use of uninitialized values, by using --undef-value-errors=no