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TableGen: TableGenStringKey is no longer necessary as of r288642

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llvm-svn: 288651
This commit is contained in:
Matthias Braun 2016-12-05 07:04:19 +00:00
parent 71bfeb32e3
commit 2fed8dafce
1 changed files with 0 additions and 55 deletions
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55
lib/TableGen/Record.cpp
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@ -30,61 +30,6 @@ using namespace llvm;
static BumpPtrAllocator Allocator;
//===----------------------------------------------------------------------===//
// std::string wrapper for DenseMap purposes
//===----------------------------------------------------------------------===//
namespace llvm {
/// This is a wrapper for std::string suitable for using as a key to a DenseMap.
/// Because there isn't a particularly
/// good way to indicate tombstone or empty keys for strings, we want
/// to wrap std::string to indicate that this is a "special" string
/// not expected to take on certain values (those of the tombstone and
/// empty keys). This makes things a little safer as it clarifies
/// that DenseMap is really not appropriate for general strings.
class TableGenStringKey {
public:
TableGenStringKey(StringRef str) : data(str) {}
TableGenStringKey(const char *str) : data(str) {}
StringRef str() const { return data; }
friend hash_code hash_value(const TableGenStringKey &Value) {
using llvm::hash_value;
return hash_value(Value.str());
}
private:
std::string data;
};
/// Specialize DenseMapInfo for TableGenStringKey.
template<> struct DenseMapInfo<TableGenStringKey> {
static inline TableGenStringKey getEmptyKey() {
TableGenStringKey Empty("<<<EMPTY KEY>>>");
return Empty;
}
static inline TableGenStringKey getTombstoneKey() {
TableGenStringKey Tombstone("<<<TOMBSTONE KEY>>>");
return Tombstone;
}
static unsigned getHashValue(const TableGenStringKey& Val) {
using llvm::hash_value;
return hash_value(Val);
}
static bool isEqual(const TableGenStringKey& LHS,
const TableGenStringKey& RHS) {
return LHS.str() == RHS.str();
}
};
} // end namespace llvm
//===----------------------------------------------------------------------===//
// Type implementations
//===----------------------------------------------------------------------===//