Add a method to get a StringMapEntry from a pointer to the string

data it contains (similar to GetStringMapEntryFromValue).
Patch by Greg Clayton!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99371 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/ADT/StringMap.h b/include/llvm/ADT/StringMap.h
index 86e8546adcacfe1cbd0d5fe3e17ad0e11e5286f7..482193859b64c8906bd96d8abfa9208024d1b17f 100644 (file)
--- a/include/llvm/ADT/StringMap.h
+++ b/include/llvm/ADT/StringMap.h
@@ -216,6 +216,14 @@ public:
   static const StringMapEntry &GetStringMapEntryFromValue(const ValueTy &V) {
     return GetStringMapEntryFromValue(const_cast<ValueTy&>(V));
   }
+  
+  /// GetStringMapEntryFromKeyData - Given key data that is known to be embedded
+  /// into a StringMapEntry, return the StringMapEntry itself.
+  static StringMapEntry &GetStringMapEntryFromKeyData(const char *KeyData) {
+    char *Ptr = const_cast<char*>(KeyData) - sizeof(StringMapEntry<ValueTy>);
+    return *reinterpret_cast<StringMapEntry*>(Ptr);
+  }
+  
 
   /// Destroy - Destroy this StringMapEntry, releasing memory back to the
   /// specified allocator.