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//===-- 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.


#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;
  MCSymbol *SectionSymbol;

  DwarfStringPool(BumpPtrAllocator &A, AsmPrinter &Asm, StringRef Prefix)
      : Pool(A), Prefix(Prefix), SectionSymbol(Asm.GetTempSymbol(Prefix)) {}

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

  /// \brief Returns the entry into the start of the pool.
  MCSymbol *getSectionSymbol();

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

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

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