Is there a tool to view JIT output?

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John - 20 Sep 2006 20:34 GMT

I really want to see what machine code the JITter is producing for an
undebugged release build. I've discovered that I can call a breakpoint
opcode (INT3) which will allow me to attach a debugger and see a little
bit of what I want but its difficult to navigate.

There's the ngen /debug option, but I can't seem to figure out how to
get ngen to generate the native assembly so that I can attach to it and
see whats going on.

Any thoughts?

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Willy Denoyette [MVP] - 20 Sep 2006 22:20 GMT

|I really want to see what machine code the JITter is producing for an
| undebugged release build. I've discovered that I can call a breakpoint
[quoted text clipped - 6 lines]
|
| Any thoughts?

The only possibility is through the native debugger.

Willy.

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Barry Kelly - 21 Sep 2006 10:53 GMT

> I really want to see what machine code the JITter is producing for an
> undebugged release build. I've discovered that I can call a breakpoint
[quoted text clipped - 4 lines]
> get ngen to generate the native assembly so that I can attach to it and
> see whats going on.

You don't need to compile in debug mode or start under the debugger to
debug the application and view the JITted code. You can attach with
WinDbg and load up SOS (".load sos"), and then use commands like
"!name2ee YourModule.exe YourNamespace.YourClass.YourMethod" to get the
jitted address (once they've been run once), and then
"!u <addressOfJITted-method>" to disassemble the body of the managed
method.

-- Barry

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http://barrkel.blogspot.com/

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Is there a tool to view JIT output?

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