[LLVMdev] ReplaceInstWithInst appears to invalidate BB iterator?

[Justin M. LaPre]

On May 7, 2011, at 1:00 PM, llvmdev-request at cs.uiuc.edu wrote:

> 
> Hi Justin,
> 
>> I have a call to ReplaceInstWithInst(Instruction *From, Instruction *To) inside of a for loop iterating through a BasicBlock::iterator.  On the very next pass after I replace the instruction, the iterator appears to be invalidated.  Is this supposed to happen or am I doing something silly?  Is there a more appropriate way to do this?  Thanks,
> 
> since ReplaceInstWithInst deletes (i.e. frees) the instruction "From", any
> iterators referring to From will be invalidated.
> 
> Ciao, Duncan.
> 

Thanks Duncan.  I was able to correct my code to work around that nuance.  I was under the impression that BasicBlock::iterators mapped onto something similar to an STL list which supports erasing arbitrary elements.  Thanks for the help!

-Justin

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