//===- Linker.h - Module Linker Interface -----------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_LINKER_LINKER_H
#define LLVM_LINKER_LINKER_H

#include "llvm/ADT/SmallPtrSet.h"

#include <functional>

namespace llvm {
class DiagnosticInfo;
class Module;
class StructType;

/// This class provides the core functionality of linking in LLVM. It keeps a
/// pointer to the merged module so far. It doesn't take ownership of the
/// module since it is assumed that the user of this class will want to do
/// something with it after the linking.
class Linker {
  public:
    typedef std::function<void(const DiagnosticInfo &)>
        DiagnosticHandlerFunction;

    Linker(Module *M, DiagnosticHandlerFunction DiagnosticHandler);
    Linker(Module *M);
    ~Linker();

    Module *getModule() const { return Composite; }
    void deleteModule();

    /// \brief Link \p Src into the composite. The source is destroyed.
    /// Returns true on error.
    bool linkInModule(Module *Src);

    static bool LinkModules(Module *Dest, Module *Src,
                            DiagnosticHandlerFunction DiagnosticHandler);

    static bool LinkModules(Module *Dest, Module *Src);

  private:
    void init(Module *M, DiagnosticHandlerFunction DiagnosticHandler);
    Module *Composite;
    SmallPtrSet<StructType*, 32> IdentifiedStructTypes;
    DiagnosticHandlerFunction DiagnosticHandler;
};

} // End llvm namespace

#endif