[lldb-dev] What's the right way to use ThreadPlanCallFunction

[Greg Clayton]

RunThreadPlan in synchronous so the shared pointer will be back to a single ref count by the time it returns.

> On Jun 15, 2015, at 3:19 PM, Keno Fischer <kfischer at college.harvard.edu> wrote:
> 
> Hey everyone, I'm having some trouble using ThreadPlanCallFunction, I tried the following, but for some reason the reference that the thread stores in m_completed_plan_stack does not increment the use count of the shared ptr.
> I have tried debugging this, but gotten nowhere, so I figured I must be missing something. Does this code look ok? (Ignore the debug print statements, though for completeness, the output is
> 
> 1
> 1
> 0xf5f1290
> 1
> 0xf5f1290
> 1
> 
>         if (!ctx.HasThreadScope())
>         {
>             error_stream.Printf("ClangUserExpression::Execute called with no thread selected.");
>             return lldb::eExpressionSetupError;
>         }
> 
>         lldb_private::EvaluateExpressionOptions options;
>         llvm::ArrayRef <lldb::addr_t> args;
> 
>         lldb::ThreadPlanSP call_plan_sp(new lldb_private::ThreadPlanCallFunction(ctx.GetThreadRef(), address, $(ClangASTType(C,rt)), args, options));
>         std::cout << call_plan_sp.use_count() << "\n";
> 
>         if (!call_plan_sp || !call_plan_sp->ValidatePlan (&error_stream))
>             return lldb::eExpressionSetupError;
> 
>         std::cout << call_plan_sp.use_count() << "\n";
> 
>         lldb::ExpressionResults execution_result = ctx.GetProcessRef().RunThreadPlan (ctx,
>                                                                                    call_plan_sp,
>                                                                                    options,
>                                                                                    error_stream);
> 
>         std::cout << ctx.GetThreadRef().m_completed_plan_stack[1].get() << "\n";
>         std::cout << ctx.GetThreadRef().m_completed_plan_stack[1].use_count() << "\n";
> 
>         std::cout << call_plan_sp.get() << "\n";
>         std::cout << call_plan_sp.use_count() << "\n";
> 
>         return lldb::eExpressionCompleted;
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