[LLVMdev] Error when using getAnalysis

[Devang Patel]

Jeff,

Just add !isDeclaration() check before requesting loop info. In your  
example, there is not any way to get loopinfo for printf whose  
definition is not available.

     if (!F.isDeclaration())
       LoopInfo &LI = getAnalysis<LoopInfo>(F);

-
Devang
On Dec 2, 2008, at 11:35 AM, Jeff Yeong-Peng Hao wrote:

> Sure.  I've attached the code for the test pass I wrote, as well as  
> the
> code and bitcode for the testcase I'm running.  All the  
> functionality has
> been stripped out of the pass, and the pass compiles without a  
> problem, but
> the error appears when the pass is run.
>
> Jeff
>
> On Tue, 2 Dec 2008 11:06:44 -0800, Devang Patel <dpatel at apple.com>  
> wrote:
>> On Dec 2, 2008, at 10:40 AM, Jeff Yeong-Peng Hao wrote:
>>
>>>
>>> Hi,
>>>
>>> I had a question about this as well.  The documentation about
>>> writing a
>>> pass shows an example like what John wrote, calling a function pass
>>> within
>>> a module pass on a per function basis.  However, if I code it that
>>> way, I
>>> still get the same error:
>>>
>>> opt: /x/jeffhao/llvm/llvm/include/llvm/PassAnalysisSupport.h:232:
>>> AnalysisType& llvm::Pass::getAnalysisID(const llvm::PassInfo*,
>>> llvm::Function&) [with AnalysisType = llvm::LoopInfo]: Assertion
>>> `ResultPass && "getAnalysis*() called on an analysis that was not "
>>> "'required' by pass!"' failed.
>>>
>>> If I remove the addRequired from getAnalysisUsage, I get this error:
>>>
>>> opt: /x/jeffhao/llvm/llvm-2.4/lib/VMCore/PassManager.cpp:1440:  
>>> virtual
>>> llvm::Pass* llvm::MPPassManager::getOnTheFlyPass(llvm::Pass*, const
>>> llvm::PassInfo*, llvm::Function&): Assertion `FPP && "Unable to find
>>> on the
>>> fly pass"' failed.
>>>
>>> What else needs to be added to make the code run?
>>
>> Is it possible for you to provide a reproducible test case to help us
>> understand what is going on ?
>> Thanks,
>> -
>> Devang
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> < 
> ModuleLoop 
> .cpp 
> > 
> < 
> ModuleLoop 
> .h 
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