[LLVMdev] problem with runOnLoop

[neda 8664]

I am changing structure of loops, I used std::vector<> but i get same
error, I can’t use FunctionPass  :(


On Mon, Dec 12, 2011 at 8:03 PM, John Criswell <criswell at illinois.edu>wrote:

>  On 12/12/11 10:25 AM, neda 8664 wrote:
>
> Thank you for your reply
> Yes, I change them, so what should I do for another loops?
>
>
> I don't really know what you should do since I don't know what your code
> does.  All I know is that it's changing the function's control-flow graph.
>
> If you're not modifying the structure of the loops in the function, then
> you can probably just fix the problem by using a worklist-style algorithm.
> First loop through the basic blocks in the function and record in a
> std::vector<> or std::set<> (or some other C++ container) the set of basic
> blocks that you want to change.  After you do that, you can iterate through
> all the basic blocks in the container and start making modifications to
> them.
>
> That will fix any iterator invalidation occurring with the for() loop.
> That may work, but if I had been writing this pass, I would probably have
> made it a FunctionPass to ensure that the CFG changes don't confuse the
> PassManager.
>
> -- John T.
>
>
>
> On Mon, Dec 12, 2011 at 7:54 PM, neda 8664 <neda8664 at gmail.com> wrote:
>
>>  Thank you for your reply
>>
>> Yes, I change them, so what should I do for another loops?
>>
>> On Mon, Dec 12, 2011 at 7:42 PM, John Criswell <criswell at illinois.edu>wrote:
>>
>>>  On 12/12/11 9:59 AM, neda 8664 wrote:
>>>
>>> hi all,
>>>
>>> I want access to all basic blocks of function in a loop, so I used the
>>> following code:
>>>
>>> *bool parallel::runOnLoop(Loop *L, LPPassManager &LPM)
>>> {
>>>     for (Function::iterator bi= func->begin(); bi != func->end(); bi++){
>>>        //
>>>      }
>>> }*
>>>
>>>
>>>  Are you modifying anything within this code (especially changes that
>>> add/remove basic blocks or change their Terminator instructions)?
>>> Depending on what you're doing, you may be invalidating the basic block
>>> iterator bi.
>>>
>>> -- John T.
>>>
>>>
>>> First loop run without problem, but for second loop I get the following
>>> error:
>>>
>>> *0  libLLVM-2.9.so 0x0137d530
>>> 1  libLLVM-2.9.so 0x0137fa6c
>>> 2                 0x002a7400 __kernel_sigreturn + 0
>>> 3  parallel.so    0x002895e9 parallel::runOnLoop(llvm::Loop*,
>>> llvm::LPPassManager&) + 345
>>> 4  libLLVM-2.9.so 0x00982994
>>> llvm::LPPassManager::runOnFunction(llvm::Function&) + 1156
>>> 5  libLLVM-2.9.so 0x00eb02c1
>>> llvm::FPPassManager::runOnFunction(llvm::Function&) + 545
>>> 6  libLLVM-2.9.so 0x00eb03d7
>>> llvm::FPPassManager::runOnModule(llvm::Module&) + 87
>>> 7  libLLVM-2.9.so 0x00eafde5
>>> llvm::MPPassManager::runOnModule(llvm::Module&) + 517
>>> 8  libLLVM-2.9.so 0x00eaff8b llvm::PassManagerImpl::run(llvm::Module&)
>>> + 171
>>> 9  libLLVM-2.9.so 0x00eb008d llvm::PassManager::run(llvm::Module&) + 45
>>> 10 opt            0x0805b32f main + 5295
>>> 11 libc.so.6      0x002becc6 __libc_start_main + 230
>>> 12 opt            0x0804ff51
>>> Stack dump:
>>> 0.    Program arguments: opt -dse -lda -memdep -basicaa -libcall-aa
>>> -scev-aa -globalsmodref-aa -load
>>> /home/llvm/src/Release+Debug+Profile+Asserts/lib/parallel.so -parallel
>>> -dot-cfg obj.o -o out.o
>>> 1.    Running pass 'Function Pass Manager' on module 'obj.o'.
>>> 2.    Running pass 'Loop Pass Manager' on function '@main'
>>> 3.    Running pass 'parallel World Pass' on basic block '%bb4'
>>> Segmentation fault (core dumped)*
>>>
>>>
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>>>
>>>
>>>
>>
>
>
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