Ah thanks, that's very helpful.
One thing that I'm a bit unsure about. If I enter a symbolic
breakpoint, will it break on the first instruction of that method or
further along? It matters because that doc states:
"If you've stopped at the first instruction of a routine, the first
parameter is at 4 bytes above the stack pointer, the second parameter
is 8 bytes above the stack pointer, and so on. The GDB syntax is *(int
*)($esp+4), *(int *)($esp+8), and so on.
If you've stopped elsewhere in the routine (after the frame has been
created), the first parameter is at 8 bytes above the frame pointer,
the second parameter is 12 bytes above the frame pointer, and so on.
The GDB syntax is *(int *)($ebp+8), *(int *)($ebp+12), and so on."
Assuming the first case, wouldn't the offset be 12, not 16? (two
implied parameters then the first visible one). The second case would
be 16 of course - so I need to know where a symbolic breakpoint
actually stops.
cheers, Graham
On 28 Jul 2008, at 6:47 pm, Jonathan del Strother wrote:
On Mon, Jul 28, 2008 at 8:02 AM, Graham Cox <[EMAIL PROTECTED]>
wrote:
Once in a blue moon, I get a console message that a nil string was
passed to
[NSConcreteAttributedString initWithString:] I'd like to find out
where this
is coming from by setting a breakpoint there, but only for a nil
string.
Adding the breakpoint as a symbol to the symbolic breakpoints
works, but I
can't set the condition (e.g. aString == nil), since the
parameter's name
isn't available.
What can I do, since this method is called hundreds of times in the
normal
course of things, so just having an unconditional breakpoint isn't
very
useful. Can I specify a register somehow?
Take a look at the debugging magic page -
http://developer.apple.com/technotes/tn2004/tn2124.html
I believe you want *(int*)($ebp+16)
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