FunctorWithAddress.h

// -*- tab-width: 2; indent-tabs-mode: nil; coding: utf-8-with-signature -*-
//-----------------------------------------------------------------------------
// Copyright 2000-2026 CEA (www.cea.fr) IFPEN (www.ifpenergiesnouvelles.com)
// See the top-level COPYRIGHT file for details.
// SPDX-License-Identifier: Apache-2.0
//-----------------------------------------------------------------------------
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/* Functor.h                                                   (C) 2000-2005 */
/*                                                                           */
/* Functor.                                                                  */
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#ifndef ARCANE_UTILS_FUNCTOR_WITH_ADDRESS_H
#define ARCANE_UTILS_FUNCTOR_WITH_ADDRESS_H
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#include "arcane/utils/IFunctorWithAddress.h"
 
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namespace Arcane
{
 
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/*!
 * \internal
 * \brief FunctorWithAddress associated with a method of a class \a T.
 */
template <typename T>
class FunctorWithAddressT
: public IFunctorWithAddress
{
 public:
 
  typedef void (T::*FuncPtr)(); //!< Type of the method pointer
 
 public:
 
  //! Constructor
  FunctorWithAddressT(T* object,
                      FuncPtr funcptr)
  : m_function(funcptr)
  , m_object(object)
  {}
 
  virtual ~FunctorWithAddressT() {}
 
 protected:
 
  //! Executes the associated method
  void executeFunctor()
  {
    (m_object->*m_function)();
  }
 
  /*!
   * \internal
   * \brief Returns the address of the associated method.
   * \warning This method must only be called by HYODA
   * and is not valid on all platforms.
   */
  void* functorAddress()
  {
    //GG: DO NOT DO THIS, because it is too platform dependent
#if defined(__x86_64__) && defined(ARCANE_OS_LINUX)
    long unsigned int* func = (long unsigned int*)&m_function;
    //printf("\t\33[7m m_object @%p, m_function @%p=0x%lx 0x%lx (sizeof=%ld)\33[m\n\r", m_object, func, *func, *(func+1), sizeof(m_function));
    // Par exemple pour la fonction d'un module utilisateur (depuis executeFunctor):
    // rcx = 0x79
    // rdx = this
    // rax = *(m_object)
    // rdi = m_function.__delta (=0)
    // movl     (%rax,%rdi,1),%rax => m_object->$vtable (@ offset 0)
    // rax = m_object->$vtable
    // rdi=m_function.__delta+m_object ( = 0+m_object)
    // movl -1(%rcx,%rax,1),%rcx => rcx=0x004280c0!
    long unsigned int pfn = *func;
    long unsigned int of7 = (pfn - 1) >> 3;
    //long unsigned int delta=*(func+1);
    long unsigned int* module_vtable = (long unsigned int*)((long unsigned int*)&(*m_object))[0];
    //printf("\t\33[7mpfn=0x%lx, delta=0x%lx module_vtable @ %p\33[m\n\r", pfn,delta,module_vtable);
    //for(int i=0;i<20;++i) printf("\t\t\33[7vtable[%ld]=0x%lx\33[m\n\r",i,module_vtable[i]);
    // If the least significant bit is 1, there is af
    if ((pfn & 1) == 1) {
      //printf("\t\t\33[7mfunctorAddress @ 0x%lx\33[m\n\r",module_vtable[of7]);
      return (void*)module_vtable[of7];
    }
    return (void*)pfn;
#else
    return 0;
#endif
  }
 
 public:
 
  FuncPtr m_function; //!< Pointer to the associated method.
  T* m_object; //!< Associated object.
};
 
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} // namespace Arcane
 
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#endif