On 07/08/2014 02:48 PM, Philippe Waroquiers wrote: > On Tue, 2014-07-08 at 14:39 -0400, Eliot Moss wrote: >> On 7/8/2014 2:04 PM, Philippe Waroquiers wrote: >>> On Tue, 2014-07-08 at 03:49 -0400, Karl Cronburg wrote: >> >> I can confirm that Jikes RVM does it own special allocation >> of stacks, which might be involved here. >> >> I am wondering why anyone would think a tool like memcheck >> would work with a Java virtual machine like JikesRVM, with >> its own notion of object, garbage collection, etc. For >> example, JikesRVM almost certainly explicitly clears memory >> before using it for objects, which would mean it is initialized, >> and verified Java bytecode will never access an uninitialized >> local variable. I suppose you might get some mileage on >> checking JNI / native code stuff, but I'm not sure. So, >> I am intrigued, but also wondering if maybe you're barking >> up the wrong tree here ... >> >> Regards -- Eliot (Hi, Sam!) > I guess memcheck could be useful for checking the RVM itself, > not the Java code run by RVM. > And maybe things like cachegrind/callgrind/helgrind might be useful ? > > Note that I have since a long time on my list of things to never do > to look at defining client requests allowing a JIT compiler to > indicate to Valgrind how to unwind and so make a reasonable > "source" stacktrace of the JIT-ed code. > Might make Valgrind a lot more interesting for mixed JIT code and JNI > and 'virtual machine implementation' follow up. > > Philippe > >
We're interested in using malloc/free client requests to see if we can get memcheck to tell us when the garbage collector is handling its' own memory incorrectly. -Karl-
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