[llvm-commits] [llvm] r99371 - /llvm/trunk/include/llvm/ADT/StringMap.h

[Chris Lattner]

Author: lattner
Date: Tue Mar 23 19:53:27 2010
New Revision: 99371

URL: http://llvm.org/viewvc/llvm-project?rev=99371&view=rev
Log:
Add a method to get a StringMapEntry from a pointer to the string
data it contains (similar to GetStringMapEntryFromValue).  
Patch by Greg Clayton!

Modified:
    llvm/trunk/include/llvm/ADT/StringMap.h

Modified: llvm/trunk/include/llvm/ADT/StringMap.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/ADT/StringMap.h?rev=99371&r1=99370&r2=99371&view=diff
==============================================================================
--- llvm/trunk/include/llvm/ADT/StringMap.h (original)
+++ llvm/trunk/include/llvm/ADT/StringMap.h Tue Mar 23 19:53:27 2010
@@ -216,6 +216,14 @@
   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.