Why do you need the Java source for that? Can't you use gdb, find out the the address of the mmap'ed area, and add a watchpoint there (scripted to log access and continue).
On Tue, Oct 9, 2012 at 1:06 PM, Amos Shapira <[email protected]> wrote: > Thanks to both of you. > > To give more details of what I'm after - I want to know whether the class > bytecode address points into the mmap(2)'ed jar file or into malloc(3)'ed > memory. I think I found part of the code path inside the jdk source which > does this and now I'm trying to determine what are the situations in which > each option is taken. > Can JMX do that? The code I'm looking at is written in pure C. > > Amos > On Oct 9, 2012 10:00 PM, "Jonathan Ben Avraham" <[email protected]> wrote: > >> Hi Amos, >> I did something like this with the JarSigner code in order to reverse >> engineer it in C, which in the end I was able to do. IMHO, gdb is too high >> a granularity to get anything usable out of the JVM execution. I suspect >> that there is no alternative to sowing System.out.print's throughout the >> code. >> Regards, >> >> - yba >> >> >> On Tue, 9 Oct 2012, Amos Shapira wrote: >> >> Date: Tue, 9 Oct 2012 10:57:29 +1100 >>> From: Amos Shapira <[email protected]> >>> To: linux-il <[email protected]> >>> Subject: Looking for directions about compiling and tracing OpenJDK >>> >>> Hi, >>> >>> I have an idea which involves going somewhat deep into the bowls of the >>> Java Jar class loader when using the official Oracle JDK 6 (and soon 7). >>> To verify this I started looking at the JDK source code but it's not >>> small and I'd like to try to trace through it while it executes Java >>> programs. >>> >>> Does anyone here have experience in doing something like this and can >>> give me some useful pointers on how to do this? >>> >>> I'd like to be able to do "gdb java -jar HelloWorld.jar" and single-step >>> through the class loader while it loads HelloWorld.jar. >>> >>> Thanks, >>> >>> --Amos >>> >>> >>> >>> >> -- >> EE 77 7F 30 4A 64 2E C5 83 5F E7 49 A6 82 29 BA ~. .~ Tk Open >> Systems >> =}----------------------------**--------------------ooO--U--** >> Ooo------------{= >> - [email protected] - tel: +972.2.679.5364, http://www.tkos.co.il - >> > > _______________________________________________ > Linux-il mailing list > [email protected] > http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il > >
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