GDB: A parse error near end of expression
GDB: A parse error near end of expression
- Subject: GDB: A parse error near end of expression
- From: Perrog <email@hidden>
- Date: Fri, 10 Nov 2006 13:45:16 +0100
Hi!
I'm adding my own user-command in GDB.
define nslog
call (void)NSLog(@"%@", (id)[(id)$arg0 description])
end
If arguments to nslog are Objective-C pointer, everything works OK and
the description is printed.
But when I pass certain arguments to my nslog, GDB fails with "A parse
error near end of expression". It is arguments containing Objective-C
code.
But if I, however, pass Objective-C expression to the built-in print
command, I get no "parse error".
Am I doing something wrong in my command definition?
Or can't I pass Objective-C expression to user-commands?
I've searched the gdb manual, but it doesn't cover much practical info
about user commands. In fact, chapter 8.1 makes me think that there
shouldn't be any different between user-command and e.g. print
built-in command.
file:///Developer/ADC Reference Library/documentation/DeveloperTools/gdb/gdb/gdb_9.html#SEC57
Thanks for any hints!
---
The user-command is basically defined like:
(gdb) define nslog
print $arg0
end
but my intention is make a shortcut to NSLog (or rather CFShow) call.
I examplify the problem with a little test session. First, passing an
Objective-C expression as an argument to "nslog" fails because of a
parse error:
(gdb) nslog [self description]
A parse error near end of expression.
Secondly, this is in contrast how built-in print command works, that
obiviously evaluates the Objective-C code:
(gdb) print (NSString *)[self description]
$2 = (class NSString *) 0x3e7950
Thirdly, calling NSLog function directly isn't a problem:
(gdb) call (void)NSLog(@"%@", (id)[self description])
2006-11-10 13:12:51.401 MyApp[1365] <Controller: 0x3770f0>
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