Hello everybody,
I am please to do an early announce a new tool named Jit DevTools.
This new tool is an addon which mostly target Jit developers. It uses the
recently added Debugger.onIonCompilation hook to display the latest MIR [1]
and LIR graphs within the dev tools.
To use this tool, go to a web page, and open the Jit DevTools panel, then
wait until a function got compiled.
Once a function is compiled, you can select a compiled script, which will
display the MIR graph of the compilation. If you need to, you can also have
a look at the LIR graph. The output is similar to the one rendered with
iongraph [5].
By selecting any inlined script, the background of the block titles will
change color, if the block correspond to the inlined instance. This feature
is quite useful to identify how a function plays in a compiled script.
You might find this tool quite handy to use for the following use cases:
- Investigating DOM optimization.
- Investigating jsperf issues.
- Comparing function implementations, and impacts on the generated code.
This addon works on optimized builds, and even with parallel compilation
enabled.
You can download [2] this early version from
http://people.mozilla.org/~npierron/jit-dev-tools/ , or build it your-self
by using the sources [3] with jpm tool [4].
Have fun, and enjoy.
[1] http://people.mozilla.org/~npierron/jit-dev-tools/jit-dev-tools-0.0.1.png
[2] http://people.mozilla.org/~npierron/jit-dev-tools/jit-dev-tools-0.0.1.xpi
[3] https://github.com/nbp/jit-dev-tools/
[4] https://developer.mozilla.org/en-US/Add-ons/SDK/Tools/jpm
[5]
https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey/Hacking_Tips#Using_IonMonkey_spew_%28JS_shell%29
--
Nicolas B. Pierron
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