Adding upstream version 2:20.4+dfsg.upstream/2%20.4+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 209 insertions, 0 deletions

diff --git a/xbmc/interfaces/legacy/AddonClass.h b/xbmc/interfaces/legacy/AddonClass.h
new file mode 100644
index 0000000..f5de375
--- /dev/null
+++ b/xbmc/interfaces/legacy/AddonClass.h
@@ -0,0 +1,209 @@
+/*
+ *  Copyright (C) 2005-2018 Team Kodi
+ *  This file is part of Kodi - https://kodi.tv
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *  See LICENSES/README.md for more information.
+ */
+
+#pragma once
+
+/**
+ * Defining LOG_LIFECYCLE_EVENTS will log all instantiations, deletions
+ *  and also reference countings (increments and decrements) that take
+ *  place on any Addon* class.
+ *
+ * Comment out (or uncomment out) to change the setting.
+ */
+//#define LOG_LIFECYCLE_EVENTS
+
+/**
+ * Defining XBMC_ADDON_DEBUG_MEMORY will make the Acquire and Release
+ *  methods virtual allow the developer to overload them in a sub-class
+ *  and set breakpoints to aid in debugging. It will also cause the
+ *  reference counting mechanism to never actually delete any AddonClass
+ *  instance allowing for the tracking of more references to (supposedly)
+ *  deallocated classes.
+ *
+ * Comment out (or uncomment out) to change the setting.
+ */
+//#define XBMC_ADDON_DEBUG_MEMORY
+
+#include "AddonString.h"
+
+#include <mutex>
+#ifdef XBMC_ADDON_DEBUG_MEMORY
+#include "utils/log.h"
+#endif
+#include "AddonUtils.h"
+
+#include <atomic>
+#include <typeindex>
+
+namespace XBMCAddon
+{
+  class LanguageHook;
+
+  /**
+   * This class is the superclass for all reference counted classes in the api.
+   * It provides a means for the bindings to handle all api objects generically.
+   *
+   * It also provides some means for debugging "lifecycle" events (see the above
+   *  description of LOG_LIFECYCLE_EVENTS).
+   *
+   * If a scripting language bindings require specific handling there is a
+   *  hook to add in these language specifics that can be set here.
+   */
+  class AddonClass : public CCriticalSection
+  {
+  private:
+    mutable std::atomic<long> refs;
+    bool m_isDeallocating = false;
+
+    // no copying
+    inline AddonClass(const AddonClass&) = delete;
+
+#ifdef XBMC_ADDON_DEBUG_MEMORY
+    bool isDeleted;
+#endif
+
+  protected:
+    LanguageHook* languageHook;
+
+    /**
+     * This method is meant to be called from the destructor of the
+     *  lowest level class.
+     *
+     * It's virtual because it's a convenient place to receive messages that
+     *  we're about to go be deleted but prior to any real tear-down.
+     *
+     * Any overloading classes need to remember to pass the call up the chain.
+     */
+    virtual void deallocating()
+    {
+      std::unique_lock<CCriticalSection> lock(*this);
+      m_isDeallocating = true;
+    }
+
+    /**
+     * This is meant to be called during static initialization and so isn't
+     * synchronized.
+     */
+    static short getNextClassIndex();
+
+  public:
+    AddonClass();
+    virtual ~AddonClass();
+
+    inline const char* GetClassname() const { return typeid(*this).name(); }
+    inline LanguageHook* GetLanguageHook() { return languageHook; }
+
+    /**
+     * This method should be called while holding a Synchronize
+     *  on the object. It will prevent the deallocation during
+     *  the time it's held.
+     */
+    bool isDeallocating() { XBMC_TRACE; return m_isDeallocating; }
+
+    static short getNumAddonClasses();
+
+#ifdef XBMC_ADDON_DEBUG_MEMORY
+    virtual
+#else
+    inline
+#endif
+    void Release() const
+#ifndef XBMC_ADDON_DEBUG_MEMORY
+    {
+      long ct = --refs;
+#ifdef LOG_LIFECYCLE_EVENTS
+      CLog::Log(LOGDEBUG, "NEWADDON REFCNT decrementing to {} on {} 0x{:x}", ct, GetClassname(),
+                (long)(((void*)this)));
+#endif
+      if(ct == 0)
+        delete this;
+    }
+#else
+    ;
+#endif
+
+
+#ifdef XBMC_ADDON_DEBUG_MEMORY
+    virtual
+#else
+    inline
+#endif
+    void Acquire() const
+#ifndef XBMC_ADDON_DEBUG_MEMORY
+    {
+#ifdef LOG_LIFECYCLE_EVENTS
+      CLog::Log(LOGDEBUG, "NEWADDON REFCNT incrementing to {} on {} 0x{:x}", ++refs, GetClassname(),
+                (long)(((void*)this)));
+#else
+      ++refs;
+#endif
+    }
+#else
+    ;
+#endif
+
+#define refcheck
+    /**
+     * This class is a smart pointer for a Referenced class.
+     */
+    template <class T> class Ref
+    {
+      T * ac;
+    public:
+      inline Ref() : ac(NULL) {}
+      inline Ref(const T* _ac) : ac(const_cast<T*>(_ac)) { if (ac) ac->Acquire(); refcheck; }
+
+      // copy semantics
+      inline Ref(Ref<T> const & oref) : ac(const_cast<T*>(oref.get())) { if (ac) ac->Acquire(); refcheck; }
+      template<class O> inline Ref(Ref<O> const & oref) : ac(static_cast<T*>(oref.get())) { if (ac) ac->Acquire(); refcheck; }
+
+      /**
+       * operator= should work with either another smart pointer or a pointer since it will
+       * be able to convert a pointer to a smart pointer using one of the above constructors.
+       *
+       * Note: There is a trick here. The temporary variable is necessary because otherwise the
+       * following code will fail:
+       *
+       * Ref<T> ptr = new T;
+       * ptr = ptr;
+       *
+       * What happens without the tmp is the dereference is called first so the object ends up
+       * deleted and then the reference happens on a deleted object. The order is reversed
+       * in the following.
+       *
+       * Note: Operator= is ambiguous if you define both an operator=(Ref<T>&) and an operator=(T*). I'm
+       * opting for the route the boost took here figuring it has more history behind it.
+       */
+      inline Ref<T>& operator=(Ref<T> const & oref)
+      { T* tmp = ac; ac = const_cast<T*>(oref.get()); if (ac) ac->Acquire(); if (tmp) tmp->Release(); refcheck; return *this; }
+
+      inline T* operator->() const { refcheck; return ac; }
+
+      /**
+       * This operator doubles as the value in a boolean expression.
+       */
+      inline operator T*() const { refcheck; return ac; }
+      inline T* get() const { refcheck; return ac; }
+      inline T& getRef() const { refcheck; return *ac; }
+
+      inline ~Ref() { refcheck; if (ac) ac->Release(); }
+      inline bool isNull() const { refcheck; return ac == NULL; }
+      inline bool isNotNull() const { refcheck; return ac != NULL; }
+      inline bool isSet() const { refcheck; return ac != NULL; }
+      inline bool operator!() const { refcheck; return ac == NULL; }
+      inline bool operator==(const AddonClass::Ref<T>& oref) const { refcheck; return ac == oref.ac; }
+      inline bool operator<(const AddonClass::Ref<T>& oref) const { refcheck; return ac < oref.ac; } // std::set semantics
+
+      // This is there only for boost compatibility
+      template<class O> inline void reset(Ref<O> const & oref) { refcheck; (*this) = static_cast<T*>(oref.get()); refcheck; }
+      template<class O> inline void reset(O * oref) { refcheck; (*this) = static_cast<T*>(oref); refcheck; }
+      inline void reset() { refcheck; if (ac) ac->Release(); ac = NULL; }
+    };
+
+  };
+}