Re: Symbolic Breakpoints
Re: Symbolic Breakpoints
- Subject: Re: Symbolic Breakpoints
- From: Richard Somers <email@hidden>
- Date: Wed, 21 Sep 2011 10:29:31 -0600
On Sep 21, 2011, at 9:43 AM, Jens Alfke wrote:
>> Is there a secret to getting symbolic breakpoints to work?
>> Set symbolic breakpoint 'keyDown:' (without the quotes) and nothing happens.
>
> The name has to be like “-[MyView keyDown:]”, otherwise it’s ambiguous which -keyDown: method you mean — there are dozens of implementations of that in classes in AppKit and your app.
>
> If you’re trying to set a breakpoint on any keyDown: call to any class, you can’t do that. Breakpoints are on code, not selectors.
That works! So apparently the entire symbol including square brackets and the initial plus or minus indicating instance method versus class method is required for an Objective-C symbolic breakpoint.
The Xcode 4 User Guide explicitly states
You can specify the symbol as:
A method name. For example, pathsMatchingExtensions:.
A method of a particular class. For example, [SKTLine drawHandlesInView], people::Person::name().
A function name. For example, _objc_msgForward.
So the documentation is apparently wrong or Xcode 4.1 has not caught up to the documentation. After testing various symbols this is what I found.
LLDB
keyDown: NOTHING
[MyView keyDown:] NOTHING
-[MyView keyDown:] WORKS
GDB
keyDown: CRASH
[MyView keyDown:] WORKS
-[MyView keyDown:] WORKS
--Richard
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