Apple

- (void) myRandomMethod

{

int x, y;

y = 1;

for ( x = 0; x < 9000000; x++ )

{

y++;

}

- (void) applicationDidFinishLaunching:(NSNotification *)aNotification

{

[self myRandomMethod];

}

I then build and ran the debug version and executed:

~ $sudo dtrace -n 'pid653:MyApp::entry { printf( "%s", execname ) }'

dtrace: description 'pid653:MyApp::entry ' matched 7 probes

However, it does not seem to be listing any entry or exit probe for myRandomMethod. What the 7 probes it did match, I am not sure as it just seemed to hang after printing out that it matched 7 probes.

What did seem to work was doing:

~ $sudo dtrace -l -n 'pid1005:MyApp::entry'

ID PROVIDER MODULE FUNCTION NAME

26632 pid1005 MyApp start entry

361570 pid1005 MyApp main entry

361588 pid1005 MyApp -[MyAppAppDelegate myRandomMethod] entry

361609 pid1005 MyApp -[MyAppAppDelegate applicationDidFinishLaunching:] entry

361628 pid1005 MyApp -[MyAppAppDelegate window] entry

361647 pid1005 MyApp -[MyAppAppDelegate setWindow:] entry

361668 pid1005 MyApp stub helpers entry

~ $sudo dtrace -l -n 'pid1005:MyApp::return'

ID PROVIDER MODULE FUNCTION NAME

361569 pid1005 MyApp main return

361587 pid1005 MyApp -[MyAppAppDelegate myRandomMethod] return

361608 pid1005 MyApp -[MyAppAppDelegate applicationDidFinishLaunching:] return

361627 pid1005 MyApp -[MyAppAppDelegate window] return

361646 pid1005 MyApp -[MyAppAppDelegate setWindow:] return

I then build and ran the release build and got the same basic results:

~ $sudo dtrace -l -n 'pid1221:MyApp::entry'

ID PROVIDER MODULE FUNCTION NAME

26601 pid1221 MyApp start entry

26602 pid1221 MyApp main entry

26603 pid1221 MyApp -[MyAppAppDelegate myRandomMethod] entry

26604 pid1221 MyApp -[MyAppAppDelegate window] entry

26605 pid1221 MyApp -[MyAppAppDelegate setWindow:] entry

26606 pid1221 MyApp -[MyAppAppDelegate applicationDidFinishLaunching:] entry

26607 pid1221 MyApp stub helpers entry

~ $sudo dtrace -l -n 'pid1221:MyApp::return'

ID PROVIDER MODULE FUNCTION NAME

70945 pid1221 MyApp main return

70946 pid1221 MyApp -[MyAppAppDelegate myRandomMethod] return

70947 pid1221 MyApp -[MyAppAppDelegate window] return

70948 pid1221 MyApp -[MyAppAppDelegate setWindow:] return

70949 pid1221 MyApp -[MyAppAppDelegate applicationDidFinishLaunching:] return

This surprised me a bit. The Release build should have all of the symbols stripped from it and yet the method names are still available. I figure this is expected, but it did surprise me.

I then ran it with my main application and got a similar error as before:

~ $sudo dtrace -l -n 'pid1247:myApp::return'

dtrace: invalid probe specifier pid1247:myApp::return: failed to create return probe for '-[NNASoundManager initializeSounds]': Invalid argument

However, this error was only seen with a release build. With the Debug build, I get all of the expected output.

Any idea why this error might be generated?

References:
	>DTrace Questions (From: Eric Gorr <email@hidden>)
	>Re: DTrace Questions (From: Jonas Maebe <email@hidden>)
	>Re: DTrace Questions (From: Franklin Marmon <email@hidden>)