Thanks - i think the client-request VALGRIND_CHECK_VALUE_IS_DEFINED is what i'm looking for.
Jody On Tue, Feb 2, 2010 at 8:42 AM, Konstantin Serebryany <konstantin.s.serebry...@gmail.com> wrote: > > > On Mon, Feb 1, 2010 at 5:22 PM, jody <jody....@gmail.com> wrote: >> >> I accidentally replied tpo Julian only. >> Here it is for the list. >> Sorry, jody >> >> ---------- Forwarded message ---------- >> From: jody <jody....@gmail.com> >> Date: Mon, Feb 1, 2010 at 3:21 PM >> Subject: Re: [Valgrind-users] variable goes uninitialized after >> 'return' of method >> To: Julian Seward <jsew...@acm.org> >> >> >> Thank you for your replies >> >> I did run it with 'track-origins=yes' and the culprit was indeed the >> array m_apVegetation. >> >> But if m_apVegetation[id] is uninitialized, shouldn't it be reported >> as such in the if statement below at line 273 (after this uninitialized >> value has been saved in pAgent)? > > Section 5.3 of the FAQ has the > answer: http://valgrind.org/docs/manual/faq.html#faq.undeferrors > --kcc > >> >> Or do i misunderstand something on how these uninitialized values behave? >> >> Thank you >> Jody >> >> On Mon, Feb 1, 2010 at 2:55 PM, Julian Seward <jsew...@acm.org> wrote: >> > >> >> The method used in line 611 is in a different class: >> >> 267:Agent *Cell::getVegAgent(spcid id) const { >> >> 268: Agent *pAgent = NULL; >> >> 269: if (id < NUM_VEG) { >> >> 270: pAgent = m_apVegetation[id]; >> >> 271: } >> >> 272: // this is to check for uninitialized >> >> 273: if (pAgent == NULL) { >> >> 274: pAgent = NULL; >> >> 275: } >> >> 276: return pAgent; >> >> 277:} >> >> >> >> When i run my application with valgrind, the first error to appear is: >> >> ==16915== Conditional jump or move depends on uninitialised value(s) >> >> ==16915== at 0x815A0ED: >> >> AgentPacker::updateVegiAgentFromArray2(float*, Population const*, >> >> unsigned int) (AgentPacker.cpp:613) >> >> >> >> I inserted various if-statem,ents in the code above to "catch" >> >> uninitialized variables, >> >> but the ' if (pAgent != NULL) {' is the only one that triggers a >> >> 'Conditional jump ..' message from valgrind. >> >> It looks like pAgent goes uninitialized between return statement line >> >> 276 in the second class and >> >> the call in line 611. >> > >> > I would guess m_apVegetation[id] is uninitialised. >> > >> > Try --track-origins=yes for Valgrind. That might help show >> > where the root cause of the problem is. >> > >> > J >> > >> >> >> ------------------------------------------------------------------------------ >> The Planet: dedicated and managed hosting, cloud storage, colocation >> Stay online with enterprise data centers and the best network in the >> business >> Choose flexible plans and management services without long-term contracts >> Personal 24x7 support from experience hosting pros just a phone call away. >> http://p.sf.net/sfu/theplanet-com >> _______________________________________________ >> Valgrind-users mailing list >> Valgrind-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/valgrind-users >> >> > > ------------------------------------------------------------------------------ The Planet: dedicated and managed hosting, cloud storage, colocation Stay online with enterprise data centers and the best network in the business Choose flexible plans and management services without long-term contracts Personal 24x7 support from experience hosting pros just a phone call away. http://p.sf.net/sfu/theplanet-com _______________________________________________ Valgrind-users mailing list Valgrind-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/valgrind-users
