[LLVMdev] How best to time passes using the API instead of opt? Also, memory leaks when trying to do timing in the API.

[Michael Ilseman]

Yes, thank you, that's basically what I have missing. I had seen
ManagedStatic crop up a few times but hadn't explored it. It seems
there are a lot of hidden gems in llvm/Support like this.

On Wed, Jun 1, 2011 at 12:24 PM, Andrew Clinton <andrew at sidefx.com> wrote:
> Oh, you probably also need to create a static llvm_shutdown_obj.
>
> On 06/01/2011 02:19 PM, Michael Ilseman wrote:
>> Thanks for the reply! Unfortunately, that seems to have the same
>> effect as setting llvm::TimePassesIsEnabled myself, and all my same
>> problems still apply as the TimingInfo's destructor (PassManager.cpp)
>> is still never called. Running it in the debugger shows that
>> TimerGroup's removeTimer method is never called, nor is it's
>> destructor (but it's constructor is).
>>
>> On Wed, Jun 1, 2011 at 11:51 AM, Andrew Clinton<andrew at sidefx.com>  wrote:
>>> I got it working with this:
>>>
>>>      int          argc = 2;
>>>      const char  *argv[2] = {"myopt", "-time-passes"};
>>>
>>>      cl::ParseCommandLineOptions(argc, (char **)argv, "my optimizer");
>>>
>>> On 06/01/2011 01:19 PM, Michael Ilseman wrote:
>>>> I have some PassManagers, and I would like to output timing data for
>>>> how long each pass takes to execute with a separate application using
>>>> the API, rather than through an llvm tool. Unfortunately, I'm having
>>>> trouble seeing how to use the existing facilities without using opt.
>>>> Setting llvm::TimePassesIsEnabled before creating the PassManagers
>>>> doesn't seem to output anything, though it is making Timers and
>>>> TimerGroups. Even if I call llvm::getPassTimer for one of the passes
>>>> (and I do get a timer that is initialized), I can't figure out to get
>>>> to its TimerGroup (TG is private, but if I use a debugger, I can get
>>>> it and call printAll successfully). Looking through the code,
>>>> TimerGroup's removeTimer (also called in it's destructor) appears to
>>>> print everything out to the info-output-file (stderr) when its Timers
>>>> are all removed but I see no output, however I'm able to call
>>>> llvm::CreateInfoOutputFile myself, pipe to it, and stuff shows up on
>>>> stderr. In PassManager.cpp, TheTimeInfo (which is a TimingInfo), gets
>>>> assigned once, and as far as I can tell never gets deleted, thus its
>>>> destructor is never called, the Timers are never deleted, and the
>>>> timing data is never output. Valgrind shows these Timers, TimerGroup,
>>>> and TimingInfo as being memory leaks for my application when I enable
>>>> llvm::TimePassesIsEnabled. Is there a way in the API to delete
>>>> TheTimeInfo myself, even though TheTimeInfo is static? Also, if this
>>>> is a bug/deficiency, I'm willing to patch this with some guidance,
>>>> e.g. is putting "delete TheTimingInfo; TheTimeInfo = 0"; in
>>>> PMTopLevelManager's destructor appropriate? Or is there a much easier
>>>> solution that I'm just missing?
>>>>
>>>> Thanks.
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