Author: jmolenda Date: Tue Jan 20 19:26:28 2015 New Revision: 226631 URL: http://llvm.org/viewvc/llvm-project?rev=226631&view=rev Log: Adding compact unwind as a source of unwind information introduced subtle bugs in two places in RegisterContextLLDB::GetFullUnwindPlanForFrame where it specifically wanted to get an eh_frame unwind plan and was using "Get CallSite UnwindPlan" as synonymous with that. But now we have two different types of unwind plan that can be returned in that case, and compact unwind won't behaves as needed.
<rdar://problem/19528559> Modified: lldb/trunk/source/Plugins/Process/Utility/RegisterContextLLDB.cpp Modified: lldb/trunk/source/Plugins/Process/Utility/RegisterContextLLDB.cpp URL: http://llvm.org/viewvc/llvm-project/lldb/trunk/source/Plugins/Process/Utility/RegisterContextLLDB.cpp?rev=226631&r1=226630&r2=226631&view=diff ============================================================================== --- lldb/trunk/source/Plugins/Process/Utility/RegisterContextLLDB.cpp (original) +++ lldb/trunk/source/Plugins/Process/Utility/RegisterContextLLDB.cpp Tue Jan 20 19:26:28 2015 @@ -811,7 +811,7 @@ RegisterContextLLDB::GetFullUnwindPlanFo if (m_frame_type == eTrapHandlerFrame && process) { m_fast_unwind_plan_sp.reset(); - unwind_plan_sp = func_unwinders_sp->GetUnwindPlanAtCallSite (process->GetTarget(), m_current_offset_backed_up_one); + unwind_plan_sp = func_unwinders_sp->GetEHFrameUnwindPlan (process->GetTarget(), m_current_offset_backed_up_one); if (unwind_plan_sp && unwind_plan_sp->PlanValidAtAddress (m_current_pc) && unwind_plan_sp->GetSourcedFromCompiler() == eLazyBoolYes) { return unwind_plan_sp; @@ -826,7 +826,10 @@ RegisterContextLLDB::GetFullUnwindPlanFo // But there is not. if (process && process->GetDynamicLoader() && process->GetDynamicLoader()->AlwaysRelyOnEHUnwindInfo (m_sym_ctx)) { - unwind_plan_sp = func_unwinders_sp->GetUnwindPlanAtCallSite (process->GetTarget(), m_current_offset_backed_up_one); + // We must specifically call the GetEHFrameUnwindPlan() method here -- normally we would + // call GetUnwindPlanAtCallSite() -- because CallSite may return an unwind plan sourced from + // either eh_frame (that's what we intend) or compact unwind (this won't work) + unwind_plan_sp = func_unwinders_sp->GetEHFrameUnwindPlan (process->GetTarget(), m_current_offset_backed_up_one); if (unwind_plan_sp && unwind_plan_sp->PlanValidAtAddress (m_current_pc)) { UnwindLogMsgVerbose ("frame uses %s for full UnwindPlan because the DynamicLoader suggested we prefer it", _______________________________________________ lldb-commits mailing list lldb-commits@cs.uiuc.edu http://lists.cs.uiuc.edu/mailman/listinfo/lldb-commits