On Nov 12, 2012, at 7:55 PM, Erick Lavoie wrote: > Hi, > > A research team instrumented JavaScriptCore in 2010 to gather empirical data > about the dynamic behavior of JavaScript [1]. I am currently wondering how > easy it would be to replicate their setup using the latest WebKit release. > > I noticed, in the latest release, that either the JIT or the Low-level > Interpreter must be enabled for the build to succeed. Does that mean that the > previous interpreter is not available anymore? If it is still available, is > there a way to use only the old interpreter, without the JIT or the LLInt?
The old interpreter is not available anymore. > > Also, I would like an opinion from one of the dev guy on how easy it would be > to add instrumentation code for every bytecode in the new Low-level > Interpreter, given that some part of it are now written in an assembler > dialect. You can write the instrumentation in assembly. Also, for most instructions, you can force the LLInt to always call to the C++ slow path, and then instrument the slow path. Look for callSlowPath(...) in the .asm files. You can almost always just replace the entire asm snippet for a bytecode with just that slow path call. Lastly, I concur with Mark's comments; the cloop might do the trick for what you're trying to do. -F > > Thanks, > > Erick > > [1] http://dl.acm.org/citation.cfm?id=1806598 > _______________________________________________ > webkit-dev mailing list > webkit-dev@lists.webkit.org > http://lists.webkit.org/mailman/listinfo/webkit-dev _______________________________________________ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo/webkit-dev
