Hello JSC hackers, I've been thinking for some time now that there is room for another command-line shell for JSC.
Things that the current JSC shell does not do, but it should do: * Profiling. * Disassembly. * Good debugging interfaces for developing JSC: bytecode dump, CFG dump, verbose deoptimization warnings A better shell would make it easier to develop JSC. It will make it easier to give an answer to questions like "why is this code fast, but this code is slow". Specific things that one might want to support in the new shell would be meta-commands: > ,profile f(1) > ,disassemble f Meta-commands are commands for the shell, not expressions to be evaluated. As expressions can't begin with a comma, we would abuse the comma to introduce those meta-commands. There would also be a meta-command to inspect and modify the current heuristics, to turn the JIT on and off, etc. These options could also be turned on and off from the command line. I was hoping that `jsc' could be that new shell, but it seems that there are some strong constraints on its interface: https://bugs.webkit.org/show_bug.cgi?id=72875 So, I wanted to solicit some thoughts on this idea before going to implement it. I really think that the right place for a project like this is in WebKit proper, rather than in some external tree, as that way it will always be in sync with JSC. Thoughts? Thanks, Andy _______________________________________________ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev