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//===-- StringTableBuilder.h - String table building utility ------*- C++ -*-=//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_STRINGTABLE_BUILDER_H
#define LLVM_MC_STRINGTABLE_BUILDER_H
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringMap.h"
#include <cassert>
namespace llvm {
/// \brief Utility for building string tables with deduplicated suffixes.
class StringTableBuilder {
SmallString<256> StringTable;
StringMap<size_t> StringIndexMap;
public:
/// \brief Add a string to the builder. Returns a StringRef to the internal
/// copy of s. Can only be used before the table is finalized.
StringRef add(StringRef s) {
assert(!isFinalized());
return StringIndexMap.GetOrCreateValue(s, 0).getKey();
}
/// \brief Analyze the strings and build the final table. No more strings can
/// be added after this point.
void finalize();
/// \brief Retrieve the string table data. Can only be used after the table
/// is finalized.
StringRef data() {
assert(isFinalized());
return StringTable;
}
/// \brief Get the offest of a string in the string table. Can only be used
/// after the table is finalized.
size_t getOffset(StringRef s) {
assert(isFinalized());
assert(StringIndexMap.count(s) && "String is not in table!");
return StringIndexMap[s];
}
private:
bool isFinalized() {
return !StringTable.empty();
}
};
} // end llvm namespace
#endif
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