/*

 * Copyright (C) 2006 Apple Computer, Inc.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public License

 * along with this library; see the file COPYING.LIB.  If not, write to

 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

 * Boston, MA 02110-1301, USA.

 *

 */

#ifndef StaticConstructors_h

#define StaticConstructors_h

// We need to avoid having static constructors. We achieve this

// with two separate methods for GCC and MSVC. Both methods prevent the static

// initializers from being registered and called on program startup. On GCC, we

// declare the global objects with a different type that can be POD default

// initialized by the linker/loader. On MSVC we use a special compiler feature

// to have the CRT ignore our static initializers. The constructors will never

// be called and the objects will be left uninitialized.

//

// With both of these approaches, we must define and explicitly call an init

// routine that uses placement new to create the objects and overwrite the

// uninitialized placeholders.

//

// This is not completely portable, but is what we have for now without

// changing how a lot of code accesses these global objects.

#ifdef SKIP_STATIC_CONSTRUCTORS_ON_MSVC

// - Assume that all includes of this header want ALL of their static

//   initializers ignored. This is currently the case. This means that if

//   a .cc includes this header (or it somehow gets included), all static

//   initializers after the include will not be executed.

// - We do this with a pragma, so that all of the static initializer pointers

//   go into our own section, and the CRT won't call them. Eventually it would

//   be nice if the section was discarded, because we don't want the pointers.

//   See: http://msdn.microsoft.com/en-us/library/7977wcck(VS.80).aspx

#pragma warning(disable:4075)

#pragma init_seg(".unwantedstaticinits")

#endif

#ifndef SKIP_STATIC_CONSTRUCTORS_ON_GCC

    // Define an global in the normal way.

#if COMPILER(MSVC7_OR_LOWER)

#define DEFINE_GLOBAL(type, name) \

    const type name;

#elif COMPILER(WINSCW)

#define DEFINE_GLOBAL(type, name, arg...) \

    const type name;

#else

#define DEFINE_GLOBAL(type, name, ...) \

    const type name;

#endif

#else

// Define an correctly-sized array of pointers to avoid static initialization.

// Use an array of pointers instead of an array of char in case there is some alignment issue.

#if COMPILER(MSVC7_OR_LOWER)

#define DEFINE_GLOBAL(type, name) \

    void * name[(sizeof(type) + sizeof(void *) - 1) / sizeof(void *)];

#elif COMPILER(WINSCW)

#define DEFINE_GLOBAL(type, name, arg...) \

    void * name[(sizeof(type) + sizeof(void *) - 1) / sizeof(void *)];

#else

#define DEFINE_GLOBAL(type, name, ...) \

    void * name[(sizeof(type) + sizeof(void *) - 1) / sizeof(void *)];

#endif

#endif

#endif // StaticConstructors_h