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From: Nicholas N. <n.n...@gm...> - 2018-10-19 05:39:08
|
I just committed an implementation of VG_(apply_ExeContext)() that I had already written and was using for my DHAT rewrite. Nick On Fri, Oct 19, 2018 at 4:44 AM Philippe Waroquiers < phi...@sk...> wrote: > On Thu, 2018-10-18 at 14:12 +0200, Julian Seward wrote: > > On 18/10/18 13:58, Martin Becker wrote: > > > Sure. I am taking snapshots (record_ExeContext) during simulation and > want to > > > walk through the associated stack traces during finalization. I wanted > to use > > > apply_ExeContext(), but it is not implemented (valgrind 3.14). OTOH, > > > apply_StackTrace() cannot be used, because I cannot access the stack > trace > > > from the ExeContext. > > > > > > Maybe I am trying something stupid and completely unplanned here, but > to me it > > > seems useful to do it that way. I don't want to walk through the stack > trace > > > during simulation, because what I am doing with it would be very slow. > > > > There is the problem that a StackTrace is just a bunch of code addresses. > > It only has meaning at the point in time where it is created. If you > come > > back to it later, you might find that some of the addresses in the trace > > refer to libraries (.so's) which have been unloaded, and/or even worse, a > > different .so has been mapped in to the same memory area. > > > > An ExeContext combines a StackTrace with an "epoch", which indicates > where in > > the .so map/unmap event sequence, the StackTrace refers to. You can only > > convert a code address (in the StackTrace) into a code location if you > have > > the epoch too. > > > > So for this reason I would suggest that a StackTrace is useless to you. > It > > sounds like you want to do after-the-event processing of their contents > > (which sounds reasonable) but for that you need to work with ExeContexts. > > > > note .. I am not 100% sure of the details about epochs above. Philippe W > > will know for sure. > > Yes, it is a better idea to work with ExeContexts, for the reasons given > above. > > The patch done by Roger to provide Apply_ExeContext seems reasonable to me, > I have some comments that I will attach to the bugzilla report. > > Philippe > > > > _______________________________________________ > Valgrind-developers mailing list > Val...@li... > https://lists.sourceforge.net/lists/listinfo/valgrind-developers > |
|
From: Nicholas N. <nj...@so...> - 2018-10-19 05:37:24
|
https://sourceware.org/git/gitweb.cgi?p=valgrind.git;h=8b689c66d9b7f12852048db0e842560761bbf904 commit 8b689c66d9b7f12852048db0e842560761bbf904 Author: Nicholas Nethercote <nne...@mo...> Date: Fri Oct 19 16:27:07 2018 +1100 Implement VG_(apply_ExeContext)(). It's been declared for a long time, but was lacking a definition. Diff: --- coregrind/m_execontext.c | 8 +++++++- include/pub_tool_execontext.h | 8 +++----- 2 files changed, 10 insertions(+), 6 deletions(-) diff --git a/coregrind/m_execontext.c b/coregrind/m_execontext.c index c5c8599..43516e9 100644 --- a/coregrind/m_execontext.c +++ b/coregrind/m_execontext.c @@ -225,13 +225,19 @@ void VG_(print_ExeContext_stats) ( Bool with_stacktraces ) ); } - /* Print an ExeContext. */ void VG_(pp_ExeContext) ( ExeContext* ec ) { VG_(pp_StackTrace)( VG_(get_ExeContext_epoch)(ec), ec->ips, ec->n_ips ); } +void VG_(apply_ExeContext)( + void(*action)(UInt n, DiEpoch ep, Addr ip, void* opaque), + void* opaque, ExeContext* ec) +{ + VG_(apply_StackTrace)(action, opaque, VG_(get_ExeContext_epoch)(ec), + ec->ips, ec->n_ips); +} void VG_(archive_ExeContext_in_range) (DiEpoch last_epoch, Addr text_avma, SizeT length ) diff --git a/include/pub_tool_execontext.h b/include/pub_tool_execontext.h index 5dbbb67..369f2c6 100644 --- a/include/pub_tool_execontext.h +++ b/include/pub_tool_execontext.h @@ -80,11 +80,9 @@ ExeContext* VG_(record_depth_1_ExeContext)(ThreadId tid, Word first_ip_delta); // Apply a function to every element in the ExeContext. The parameter 'n' // gives the index of the passed ip. Doesn't go below main() unless // --show-below-main=yes is set. -// Currently, the below function is unused. If ever it is used one day, -// we should add epoch args similarly to function VG_(apply_StackTrace) -// in pub_tool_stacktrace.h. -extern void VG_(apply_ExeContext)( void(*action)(UInt n, Addr ip), - ExeContext* ec, UInt n_ips ); +extern void VG_(apply_ExeContext)( + void(*action)(UInt n, DiEpoch ep, Addr ip, void* opaque), + void* opaque, ExeContext* ec); // Compare two ExeContexts. Number of callers considered depends on `res': // Vg_LowRes: 2 |