Пример #1
0
UnwindPlanSP
FuncUnwinders::GetUnwindPlanArchitectureDefaultAtFunctionEntry (Thread& thread)
{
    // Lock the mutex to ensure we can always give out the most appropriate
    // information. We want to make sure if someone requests an unwind
    // plan, that they get one and don't run into a race condition where one
    // thread has started to create the unwind plan and has put it into 
    // the auto_ptr member variable, and have another thread enter this function
    // and return the partially filled pointer contained in the auto_ptr.
    // We also want to make sure that we lock out other unwind plans from
    // being accessed until this one is done creating itself in case someone
    // had some code like:
    //  UnwindPlan *best_unwind_plan = ...GetUnwindPlanAtCallSite (...)
    //  if (best_unwind_plan == NULL)
    //      best_unwind_plan = GetUnwindPlanAtNonCallSite (...)
    Mutex::Locker locker (m_mutex);
    if (m_tried_unwind_arch_default_at_func_entry == false && m_unwind_plan_arch_default_at_func_entry_sp.get() == NULL)
    {
        m_tried_unwind_arch_default_at_func_entry = true;
        Address current_pc;
        ProcessSP process_sp (thread.CalculateProcess());
        if (process_sp)
        {
            ABI *abi = process_sp->GetABI().get();
            if (abi)
            {
                m_unwind_plan_arch_default_at_func_entry_sp.reset (new UnwindPlan (lldb::eRegisterKindGeneric));
                if (m_unwind_plan_arch_default_at_func_entry_sp)
                    abi->CreateFunctionEntryUnwindPlan(*m_unwind_plan_arch_default_at_func_entry_sp);
            }
        }
    }

    return m_unwind_plan_arch_default_sp;
}
Пример #2
0
UnwindPlanSP
FuncUnwinders::GetUnwindPlanArchitectureDefaultAtFunctionEntry (Thread& thread)
{
    if (m_unwind_plan_arch_default_at_func_entry_sp.get() || m_tried_unwind_arch_default_at_func_entry)
        return m_unwind_plan_arch_default_at_func_entry_sp;

    std::lock_guard<std::recursive_mutex> guard(m_mutex);
    m_tried_unwind_arch_default_at_func_entry = true;

    Address current_pc;
    ProcessSP process_sp (thread.CalculateProcess());
    if (process_sp)
    {
        ABI *abi = process_sp->GetABI().get();
        if (abi)
        {
            m_unwind_plan_arch_default_at_func_entry_sp.reset (new UnwindPlan (lldb::eRegisterKindGeneric));
            if (!abi->CreateFunctionEntryUnwindPlan(*m_unwind_plan_arch_default_at_func_entry_sp))
            {
                m_unwind_plan_arch_default_at_func_entry_sp.reset();
            }
        }
    }

    return m_unwind_plan_arch_default_at_func_entry_sp;
}