[llvm-commits] [llvm] r42480 - /llvm/trunk/include/llvm/ADT/StringMap.h
Chris Lattner
sabre at nondot.org
Sun Sep 30 01:31:46 PDT 2007
Author: lattner
Date: Sun Sep 30 03:31:46 2007
New Revision: 42480
URL: http://llvm.org/viewvc/llvm-project?rev=42480&view=rev
Log:
Add a helper useful when mapping from a map element to its hash node.
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=42480&r1=42479&r2=42480&view=diff
==============================================================================
--- llvm/trunk/include/llvm/ADT/StringMap.h (original)
+++ llvm/trunk/include/llvm/ADT/StringMap.h Sun Sep 30 03:31:46 2007
@@ -166,7 +166,18 @@
MallocAllocator A;
return Create(KeyStart, KeyEnd, A);
}
-
+
+
+ /// GetStringMapEntryFromValue - Given a value that is known to be embedded
+ /// into a StringMapEntry, return the StringMapEntry itself.
+ static StringMapEntry &GetStringMapEntryFromValue(ValueTy &V) {
+ return *reinterpret_cast<StringMapEntry*>(reinterpret_cast<char*>(&V) -
+ sizeof(StringMapEntryBase));
+ }
+ static const StringMapEntry &GetStringMapEntryFromValue(const ValueTy &V) {
+ return GetStringMapEntryFromValue(const_cast<ValueTy&>(V));
+ }
+
/// Destroy - Destroy this StringMapEntry, releasing memory back to the
/// specified allocator.
template<typename AllocatorTy>
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