SealSharedLib.h

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/*
  Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
*/

 
#ifndef CXXUTILS_SEAL_SHAREDLIB_H // wlav SEAL_BASE_SHARED_LIBRARY_H
#define CXXUTILS_SEAL_SHAREDLIB_H // wlav SEAL_BASE_SHARED_LIBRARY_H
 
 
#include "CxxUtils/checker_macros.h"
//# include "SealBase/SharedLibraryError.h"       wlav
//# include "SealBase/Callback.h"                 wlav
# include <string>
# include <list>
# include <exception>                          // wlav
 
//namespace seal {                                wlav
namespace Athena {                             // wlav
 
 
 
// wlav from SealBase/Callback.h
template <class T1>
class Callback1Rep
{
public:
    Callback1Rep (void) : m_refs (0) { }
    virtual ~Callback1Rep (void) { }
 
    virtual void    call (T1) = 0;
    virtual bool    equal (const Callback1Rep *x) const = 0;
 
    void        ref (void)   { ++m_refs; }
    void        unref (void)   { if (--m_refs == 0) delete this; }
 
private:
    int         m_refs;
};
 
template <class T1>
class Callback1
{
public:
    Callback1 (Callback1Rep<T1> *implementation = 0);
    Callback1 (const Callback1 &x);
    ~Callback1 (void);
    Callback1 &    operator= (const Callback1 &x);
 
    bool        operator== (const Callback1 &x) const;
    /**/        operator bool (void) const;
    void        operator() (T1);
 
private:
    Callback1Rep<T1>    *m_rep;
};
 
template <class T1, class T2>
class CallbackImpF11 : public Callback1Rep<T1>
{
    typedef CallbackImpF11 self;
public:
    CallbackImpF11 (void (*function) (T1, T2),
            const T2 &fill_2)
    : m_function (function),
      m_fill_2 (fill_2)
    { }
 
    virtual void call (T1 a)
    { (*m_function) (a, m_fill_2); }
 
    virtual bool equal (const Callback1Rep<T1> *other) const
    { const self *x = dynamic_cast<const self *> (other);
      return x && x->m_function == m_function && x->m_fill_2 == m_fill_2; }
 
private:
    void    (*m_function) (T1, T2);
    T2      m_fill_2;
};
 
template <class T1>
inline
Callback1<T1>::Callback1 (Callback1Rep<T1> *implementation /* = 0 */)
    : m_rep (implementation)
{ if (m_rep) m_rep->ref (); }
 
template <class T1>
inline
Callback1<T1>::Callback1 (const Callback1<T1> &x)
    : m_rep (x.m_rep)
{ if (m_rep) m_rep->ref (); }
 
template <class T1>
inline
Callback1<T1>::~Callback1 (void)
{ if (m_rep) m_rep->unref (); }
 
template <class T1>
inline Callback1<T1> &
Callback1<T1>::operator= (const Callback1<T1> &x)
{
    if (m_rep != x.m_rep)
    {
    if (m_rep) m_rep->unref ();
    m_rep = x.m_rep;
    if (m_rep) m_rep->ref ();
    }
    return *this;
}
 
template <class T1>
inline bool
Callback1<T1>::operator== (const Callback1<T1> &x) const
{ return m_rep == x.m_rep || (m_rep && x.m_rep && m_rep->equal (x.m_rep)); }
 
template <class T1>
inline
Callback1<T1>::operator bool (void) const
{ return m_rep ? true : false; } // FIXME: for Sun CC 4.2 (no bool)
 
template <class T1>
inline void
Callback1<T1>::operator() (T1 a)
{ m_rep->call (a); }
 
template <class T1, class T2>
inline Callback1Rep<T1> *
CreateCallback (void (*function) (T1, T2),
        const T2 &fill_2)
{ return new CallbackImpF11<T1,T2> (function, fill_2); }
 
 
// wlav modified from SealBase/SharedLibraryError.h
class SharedLibraryError : public std::exception
{
public:
    SharedLibraryError( const std::string& context, const std::string& cause );
    virtual ~SharedLibraryError() throw() {}
 
    virtual const char* what() const throw();
 
private:
    std::string      m_message;
};
 

class SharedLibrary
{
public:
    typedef void *      Data;
    typedef void        (*Function) (void);

    struct LibraryInfo
    {
    unsigned long       m_text_start;   //< Start of text segment
    unsigned long       m_text_end;   //< End of text segment
    unsigned long       m_data_start;   //< Start of data segment
    unsigned long       m_data_end;   //< End of data segment
    unsigned long       m_bss_start; //< Start of common
    unsigned long       m_bss_end; //< End of common
    const char      *m_filename;  //< Filename
    };
 
    typedef Callback1<const LibraryInfo &> InfoHandler;
 
    static std::string      path (void);
    static void         path ATLAS_NOT_THREAD_SAFE (const std::string &path);
    static std::string      libname (const std::string &name);
    static std::string      symname (const std::string &name);
 
    static SharedLibrary * self (void);
    static SharedLibrary * load (const std::string &name);
    static void         loaded (InfoHandler &handler);
 
    void            release (void);
    void            abandon (void);
 
    Data            data (const std::string &name, bool mangle = true) const;
    Function            function (const std::string &name, bool mangle = true) const;
 
protected:
    SharedLibrary (void *handle);
    ~SharedLibrary (void);
 
private:
    void            *m_handle;
 
    // undefined semantics
    SharedLibrary (const SharedLibrary &);
    SharedLibrary &operator= (const SharedLibrary &);
};
 
//<<<<<< INLINE PUBLIC FUNCTIONS                                        >>>>>>
//<<<<<< INLINE MEMBER FUNCTIONS                                        >>>>>>
 
//} // namespace seal                             wlav
} // namespace Athena                             wlav
#endif // CXXUTILS_SEAL_SHAREDLIB_H wlav SEAL_BASE_SHARED_LIBRARY_H