Red Hat ENTERPRISE LINUX 4 - DEVELOPER TOOLS GUIDE, Manual

Page: 130 / 410

120 Chapter 14. Using gdb with Different Languages
•
clear
• break
•
info line
• jump
• list
A fully qualified Objective-C method name is specified as
-[
Class methodName
]
where the minus sign is used to indicate an instance method and a plus sign (not shown) is used
to indicate a class method. The class name
Class
and method name
methoName
are enclosed in
brackets, similar to the way messages are specified in Objective-C source code. For example, to set a
breakpoint at the
create
instance method of class
Fruit
in the program currently being debugged,
enter:
break -[Fruit create]
To list ten program lines around the
initialize
class method, enter:
list +[NSText initialize]
In the current version of GDB, the plus or minus sign is required. In future versions of GDB, the plus
or minus sign will be optional, but you can use it to narrow the search. It is also possible to specify
just a method name:
break create
You must specify the complete method name, including any colons. If your program’s source files
contain more than one
create
method, you’ll be presented with a numbered list of classes that im-
plement that method. Indicate your choice by number, or type
0
to exit if none apply.
As another example, to clear a breakpoint established at the
makeKeyAndOrderFront:
method of
the
NSWindow
class, enter:
clear -[NSWindow makeKeyAndOrderFront:]
14.4.2.2. The Print Command With Objective-C
The print command has also been extended to accept methods. For example:
print -[object hash]