llvm-mirror/lib/CodeGen/AsmPrinter/DwarfStringPool.h

//===-- llvm/CodeGen/DwarfStringPool.h - Dwarf Debug Framework -*- C++ -*--===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DWARFSTRINGPOOL_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_DWARFSTRINGPOOL_H

#include "llvm/ADT/StringMap.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/Support/Allocator.h"
#include <utility>

namespace llvm {

class MCSymbol;
class MCSection;
class StringRef;

// Collection of strings for this unit and assorted symbols.
// A String->Symbol mapping of strings used by indirect
// references.
class DwarfStringPool {
  StringMap<std::pair<MCSymbol *, unsigned>, BumpPtrAllocator &> Pool;
  StringRef Prefix;

public:
  DwarfStringPool(BumpPtrAllocator &A, AsmPrinter &Asm, StringRef Prefix)
      : Pool(A), Prefix(Prefix) {}

  void emit(AsmPrinter &Asm, MCSection *StrSection,
            MCSection *OffsetSection = nullptr);

  /// \brief Returns an entry into the string pool with the given
  /// string text.
  MCSymbol *getSymbol(AsmPrinter &Asm, StringRef Str) {
    return getEntry(Asm, Str).first;
  }

  /// \brief Returns the index into the string pool with the given
  /// string text.
  unsigned getIndex(AsmPrinter &Asm, StringRef Str) {
    return getEntry(Asm, Str).second;
  }

  bool empty() const { return Pool.empty(); }

private:
  std::pair<MCSymbol *, unsigned> &getEntry(AsmPrinter &Asm, StringRef Str);
};
}
#endif