macOS How can I get XCode / GDB to break in a Safari 5.1 NPAPI plugin?

[david-douglass]

I have an NPAPI plug in running on OS X 10.6.8 that I'd like to debug. When I load it using FireFox 3.6.19, I can set the active executable to FF, start FF, attach using XCode, and the breakpoint will fire at the expected time.

When using Safari 5.1, I see that the plug in runs out of process, so I created and activated a customer executable for /System/Library/PrivateFrameworks/WebKit2.framework/PluginProcess.app. I then start Safari, navigate to the page hosting the plug in, attach to the plug in process, and then use the UI such the breakpoint should fire, but it doesn't. I can tell by the UI that the plug in definately loaded. If the pause the process, I see:

(gdb) i b
Num Type           Disp Enb Address    What
1   breakpoint     keep y   <PENDING>  "ADP_NPAPI_Interface.m":34
2   breakpoint     keep y   <PENDING>  "ADP_NPAPI_Interface.m":34
3   breakpoint     keep y   <PENDING>  "ADP_NPAPI_Interface.m":34
4   breakpoint     keep y   <PENDING>  "plugin.cpp":244
5   breakpoint     keep y   <PENDING>  "plugin.cpp":358
6   breakpoint     keep y   <PENDING>  objc_exception_throw
(gdb) show directories
Source directories searched: $cdir:$cwd
(gdb) info sources
No symbol table is loaded.  Use the "file" command.
(gdb) file sources
sources: No such file or directory
(gdb) info file
No registers.
No registers.
(gdb) show paths
Executable and object file path: /Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin

DEBUG_INFORMATION_FORMAT = dwarf-with-dsym. My understanding is that the symbols will be in the plug in, so, I believe that gdb can't find my source files.

Thanks in advance for your help,
Dave