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

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

llvm-svn: 99371
This commit is contained in:
Chris Lattner 2010-03-24 00:53:27 +00:00
parent 36f990dc18
commit 93b617fac4
1 changed files with 8 additions and 0 deletions
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8
include/llvm/ADT/StringMap.h
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@ -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.