[llvm] r294572 - LVI: Fix use-of-uninitialized-value after r294463

[Philip Reames via llvm-commits]

Test case?

Philip

On 02/09/2017 01:28 AM, Vitaly Buka via llvm-commits wrote:
> Author: vitalybuka
> Date: Thu Feb  9 03:28:05 2017
> New Revision: 294572
>
> URL: http://llvm.org/viewvc/llvm-project?rev=294572&view=rev
> Log:
> LVI: Fix use-of-uninitialized-value after r294463
>
> BlockValueStack can be reallocated making reference e invalid.
>
> Modified:
>      llvm/trunk/lib/Analysis/LazyValueInfo.cpp
>
> Modified: llvm/trunk/lib/Analysis/LazyValueInfo.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/LazyValueInfo.cpp?rev=294572&r1=294571&r2=294572&view=diff
> ==============================================================================
> --- llvm/trunk/lib/Analysis/LazyValueInfo.cpp (original)
> +++ llvm/trunk/lib/Analysis/LazyValueInfo.cpp Thu Feb  9 03:28:05 2017
> @@ -677,7 +677,7 @@ void LazyValueInfoImpl::solve() {
>         BlockValueStack.clear();
>         return;
>       }
> -    std::pair<BasicBlock *, Value *> &e = BlockValueStack.back();
> +    std::pair<BasicBlock *, Value *> e = BlockValueStack.back();
>       assert(BlockValueSet.count(e) && "Stack value should be in BlockValueSet!");
>   
>       if (solveBlockValue(e.second, e.first)) {
>
>
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