llvm dev - Apr 2018 - Error: Verify if there is a pass dependency cycle

Hi everyone,

I write a new FunctionPass which wants to use pass PostDominatorTree, so I
implement the next function:

void getAnalysisUsage(AnalysisUsage &AU) const {
      AU.addRequired<PostDominatorTree>();
      AU.setPreservesAll();
}

Then I get PDT through the next statement:

PostDominatorTree *PDT = &getAnalysis<PostDominatorTree>();

My code can be successfully compiled. However, I encounter the next error
when I ran the code:

*Pass 'Unnamed pass: implement Pass::getPassName()' is not initialized.*
*Verify if there is a pass dependency cycle.*
*Required Passes:*

I used llvm-3.4. Any comments are welcome. Thanks!


Best regards,

Qiuping Yi
Institute Of Software
Chinese Academy of Sciences
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Hi,

You need to initialize your pass with:

INITIALIZE_PASS_BEGIN(YourPass, "your-pass", "Your Pass",
/*cfgonly=*/false, /*analysis=*/false)
INITIALIZE_PASS_DEPENDENCY(PostDominatorTreeWrapperPass)
INITIALIZE_PASS_END(YourPass, "your-pass", "Your Pass",
/*cfgonly=*/false,
/*analysis=*/false)

So as to both register your pass, and have PostDominatorTreeWrapperPass
(which is the Analysis pass in charge of creating the PostDominatorTree)
initialized before your pass.

It also give a pretty name to YourPass: "Your Pass"
And add an option to opt to run it: "-your-pass"


On Wed, Apr 11, 2018 at 9:39 PM, Qiuping Yi via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Hi everyone,
>
> I write a new FunctionPass which wants to use pass PostDominatorTree, so I
> implement the next function:
>
> void getAnalysisUsage(AnalysisUsage &AU) const {
>       AU.addRequired<PostDominatorTree>();
>       AU.setPreservesAll();
> }
>
> Then I get PDT through the next statement:
>
> PostDominatorTree *PDT = &getAnalysis<PostDominatorTree>();
>
> My code can be successfully compiled. However, I encounter the next error
> when I ran the code:
>
> *Pass 'Unnamed pass: implement Pass::getPassName()' is not
initialized.*
> *Verify if there is a pass dependency cycle.*
> *Required Passes:*
>
> I used llvm-3.4. Any comments are welcome. Thanks!
>
>
> Best regards,
>
> Qiuping Yi
> Institute Of Software
> Chinese Academy of Sciences
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>

-- 
*Alexandre Isoard*
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Yes, I forgot to initialize my pass. Thank you very much.


Best regards,

Qiuping Yi
Institute Of Software
Chinese Academy of Sciences

On Sat, Apr 14, 2018 at 12:57 AM, Alexandre Isoard <
alexandre.isoard at gmail.com> wrote:
> Hi,
>
> You need to initialize your pass with:
>
> INITIALIZE_PASS_BEGIN(YourPass, "your-pass", "Your
Pass",
> /*cfgonly=*/false, /*analysis=*/false)
> INITIALIZE_PASS_DEPENDENCY(PostDominatorTreeWrapperPass)
> INITIALIZE_PASS_END(YourPass, "your-pass", "Your Pass",
/*cfgonly=*/false,
> /*analysis=*/false)
>
> So as to both register your pass, and have PostDominatorTreeWrapperPass
> (which is the Analysis pass in charge of creating the PostDominatorTree)
> initialized before your pass.
>
> It also give a pretty name to YourPass: "Your Pass"
> And add an option to opt to run it: "-your-pass"
>
>
> On Wed, Apr 11, 2018 at 9:39 PM, Qiuping Yi via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Hi everyone,
>>
>> I write a new FunctionPass which wants to use pass PostDominatorTree,
so
>> I
>> implement the next function:
>>
>> void getAnalysisUsage(AnalysisUsage &AU) const {
>>       AU.addRequired<PostDominatorTree>();
>>       AU.setPreservesAll();
>> }
>>
>> Then I get PDT through the next statement:
>>
>> PostDominatorTree *PDT = &getAnalysis<PostDominatorTree>();
>>
>> My code can be successfully compiled. However, I encounter the next
error
>> when I ran the code:
>>
>> *Pass 'Unnamed pass: implement Pass::getPassName()' is not
initialized.*
>> *Verify if there is a pass dependency cycle.*
>> *Required Passes:*
>>
>> I used llvm-3.4. Any comments are welcome. Thanks!
>>
>>
>> Best regards,
>>
>> Qiuping Yi
>> Institute Of Software
>> Chinese Academy of Sciences
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>>
>
>
> --
> *Alexandre Isoard*
>
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