[llvm-commits] [llvm] r116592 - in /llvm/trunk: docs/CommandGuide/FileCheck.pod utils/FileCheck/FileCheck.cpp

[Jim Grosbach]

Nifty! Thanks, Jakob.

On Oct 15, 2010, at 10:47 AM, Jakob Stoklund Olesen wrote:

> Author: stoklund
> Date: Fri Oct 15 12:47:12 2010
> New Revision: 116592
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=116592&view=rev
> Log:
> Teach FileCheck to handle trailing CHECK-NOT patterns.
> 
> A CHECK-NOT pattern without a following CHECK pattern simply checks that the
> pattern doesn't match before the end of the input file.
> 
> You can even have only CHECK-NOT patterns to check that strings appear nowhere
> in the input file.
> 
> Modified:
>    llvm/trunk/docs/CommandGuide/FileCheck.pod
>    llvm/trunk/utils/FileCheck/FileCheck.cpp
> 
> Modified: llvm/trunk/docs/CommandGuide/FileCheck.pod
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/docs/CommandGuide/FileCheck.pod?rev=116592&r1=116591&r2=116592&view=diff
> ==============================================================================
> --- llvm/trunk/docs/CommandGuide/FileCheck.pod (original)
> +++ llvm/trunk/docs/CommandGuide/FileCheck.pod Fri Oct 15 12:47:12 2010
> @@ -165,7 +165,7 @@
> =head2 The "CHECK-NOT:" directive
> 
> The CHECK-NOT: directive is used to verify that a string doesn't occur
> -between two matches (or the first match and the beginning of the file).  For
> +between two matches (or before the first match, or after the last match).  For
> example, to verify that a load is removed by a transformation, a test like this
> can be used:
> 
> 
> Modified: llvm/trunk/utils/FileCheck/FileCheck.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/FileCheck/FileCheck.cpp?rev=116592&r1=116591&r2=116592&view=diff
> ==============================================================================
> --- llvm/trunk/utils/FileCheck/FileCheck.cpp (original)
> +++ llvm/trunk/utils/FileCheck/FileCheck.cpp Fri Oct 15 12:47:12 2010
> @@ -50,6 +50,10 @@
> class Pattern {
>   SMLoc PatternLoc;
> 
> +  /// MatchEOF - When set, this pattern only matches the end of file. This is
> +  /// used for trailing CHECK-NOTs.
> +  bool MatchEOF;
> +
>   /// FixedStr - If non-empty, this pattern is a fixed string match with the
>   /// specified fixed string.
>   StringRef FixedStr;
> @@ -71,7 +75,7 @@
> 
> public:
> 
> -  Pattern() { }
> +  Pattern(bool matchEOF = false) : MatchEOF(matchEOF) { }
> 
>   bool ParsePattern(StringRef PatternStr, SourceMgr &SM);
> 
> @@ -271,6 +275,12 @@
> /// there is a match, the size of the matched string is returned in MatchLen.
> size_t Pattern::Match(StringRef Buffer, size_t &MatchLen,
>                       StringMap<StringRef> &VariableTable) const {
> +  // If this is the EOF pattern, match it immediately.
> +  if (MatchEOF) {
> +    MatchLen = 0;
> +    return Buffer.size();
> +  }
> +
>   // If this is a fixed string pattern, just match it now.
>   if (!FixedStr.empty()) {
>     MatchLen = FixedStr.size();
> @@ -565,18 +575,20 @@
>     std::swap(NotMatches, CheckStrings.back().NotStrings);
>   }
> 
> +  // Add an EOF pattern for any trailing CHECK-NOTs.
> +  if (!NotMatches.empty()) {
> +    CheckStrings.push_back(CheckString(Pattern(true),
> +                                       SMLoc::getFromPointer(Buffer.data()),
> +                                       false));
> +    std::swap(NotMatches, CheckStrings.back().NotStrings);
> +  }
> +
>   if (CheckStrings.empty()) {
>     errs() << "error: no check strings found with prefix '" << CheckPrefix
>            << ":'\n";
>     return true;
>   }
> 
> -  if (!NotMatches.empty()) {
> -    errs() << "error: '" << CheckPrefix
> -           << "-NOT:' not supported after last check line.\n";
> -    return true;
> -  }
> -
>   return false;
> }
> 
> @@ -662,10 +674,11 @@
> 
>     // Find StrNo in the file.
>     size_t MatchLen = 0;
> -    Buffer = Buffer.substr(CheckStr.Pat.Match(Buffer, MatchLen, VariableTable));
> +    size_t MatchPos = CheckStr.Pat.Match(Buffer, MatchLen, VariableTable);
> +    Buffer = Buffer.substr(MatchPos);
> 
>     // If we didn't find a match, reject the input.
> -    if (Buffer.empty()) {
> +    if (MatchPos == StringRef::npos) {
>       PrintCheckFailed(SM, CheckStr, SearchFrom, VariableTable);
>       return 1;
>     }
> 
> 
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