[llvm] r214210 - Fix FileCheck crash when empty prefix is passed.

[David Blaikie]

On Tue, Jul 29, 2014 at 1:30 PM, Eli Bendersky <eliben at google.com> wrote:
> Author: eliben
> Date: Tue Jul 29 15:30:53 2014
> New Revision: 214210
>
> URL: http://llvm.org/viewvc/llvm-project?rev=214210&view=rev
> Log:
> Fix FileCheck crash when empty prefix is passed.

Test case? (we do have some FileCheck tests, I think)

>
>
> Modified:
>     llvm/trunk/utils/FileCheck/FileCheck.cpp
>
> Modified: llvm/trunk/utils/FileCheck/FileCheck.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/FileCheck/FileCheck.cpp?rev=214210&r1=214209&r2=214210&view=diff
> ==============================================================================
> --- llvm/trunk/utils/FileCheck/FileCheck.cpp (original)
> +++ llvm/trunk/utils/FileCheck/FileCheck.cpp Tue Jul 29 15:30:53 2014
> @@ -1212,6 +1212,10 @@ static bool ValidateCheckPrefixes() {
>         I != E; ++I) {
>      StringRef Prefix(*I);
>
> +    // Reject empty prefixes.
> +    if (Prefix == "")
> +      return false;
> +
>      if (!PrefixSet.insert(Prefix))
>        return false;
>
>
>
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