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Add a helper useful when mapping from a map element to its hash node.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42480 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-09-30 08:31:46 +00:00
parent ab528fe0fb
commit 1bcc79666d
1 changed files with 12 additions and 1 deletions
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13
include/llvm/ADT/StringMap.h
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@ -166,7 +166,18 @@ public:
MallocAllocator A; MallocAllocator A;
return Create(KeyStart, KeyEnd, 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 /// Destroy - Destroy this StringMapEntry, releasing memory back to the
/// specified allocator. /// specified allocator.
template<typename AllocatorTy> template<typename AllocatorTy>