[clang] dc87a14 - [Clang] Fix sanitizer failure on DenseMap sentinel value enum

[Joseph Huber via cfe-commits]

Author: Joseph Huber
Date: 2025-07-22T09:12:13-05:00
New Revision: dc87a14efb381d960c8fbf988221f31216d7f5fd

URL: https://github.com/llvm/llvm-project/commit/dc87a14efb381d960c8fbf988221f31216d7f5fd
DIFF: https://github.com/llvm/llvm-project/commit/dc87a14efb381d960c8fbf988221f31216d7f5fd.diff

LOG: [Clang] Fix sanitizer failure on DenseMap sentinel value enum

Summary:
This triggers UBSan because the sentinel value `-1` is outside the range
of accepted enum values. Just replace this with a small set.

Added: 
    

Modified: 
    clang/lib/Driver/Driver.cpp

Removed: 
    


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diff  --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 706b905eed407..ff2f92d1a94c8 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -68,6 +68,7 @@
 #include "clang/Driver/Types.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/StringSet.h"
@@ -1062,7 +1063,7 @@ void Driver::CreateOffloadingDeviceToolChains(Compilation &C,
         (C.getInputArgs().hasArg(options::OPT_offload_arch_EQ) &&
          !(IsCuda || IsHIP))));
 
-  llvm::DenseSet<Action::OffloadKind> Kinds;
+  llvm::SmallSet<Action::OffloadKind, 4> Kinds;
   const std::pair<bool, Action::OffloadKind> ActiveKinds[] = {
       {IsCuda, Action::OFK_Cuda},
       {IsHIP, Action::OFK_HIP},