compiler_specific.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

#ifndef BASE_COMPILER_SPECIFIC_H_

#define BASE_COMPILER_SPECIFIC_H_

#if defined(_MSC_VER)

// Macros for suppressing and disabling warnings on MSVC.

//

// Warning numbers are enumerated at:

// http://msdn.microsoft.com/en-us/library/8x5x43k7(VS.80).aspx

//

// The warning pragma:

// http://msdn.microsoft.com/en-us/library/2c8f766e(VS.80).aspx

//

// Using __pragma instead of #pragma inside macros:

// http://msdn.microsoft.com/en-us/library/d9x1s805.aspx

// MSVC_SUPPRESS_WARNING disables warning |n| for the remainder of the line and

// for the next line of the source file.

#  define MSVC_SUPPRESS_WARNING(n) __pragma(warning(suppress : n))

// MSVC_PUSH_DISABLE_WARNING pushes |n| onto a stack of warnings to be disabled.

// The warning remains disabled until popped by MSVC_POP_WARNING.

#  define MSVC_PUSH_DISABLE_WARNING(n) \

    __pragma(warning(push)) __pragma(warning(disable : n))

// MSVC_PUSH_WARNING_LEVEL pushes |n| as the global warning level.  The level

// remains in effect until popped by MSVC_POP_WARNING().  Use 0 to disable all

// warnings.

#  define MSVC_PUSH_WARNING_LEVEL(n) __pragma(warning(push, n))

// Pop effects of innermost MSVC_PUSH_* macro.

#  define MSVC_POP_WARNING() __pragma(warning(pop))

#  define MSVC_DISABLE_OPTIMIZE() __pragma(optimize("", off))

#  define MSVC_ENABLE_OPTIMIZE() __pragma(optimize("", on))

// Allows |this| to be passed as an argument in constructor initializer lists.

// This uses push/pop instead of the seemingly simpler suppress feature to avoid

// having the warning be disabled for more than just |code|.

//

// Example usage:

// Foo::Foo() : x(NULL), ALLOW_THIS_IN_INITIALIZER_LIST(y(this)), z(3) {}

//

// Compiler warning C4355: 'this': used in base member initializer list:

// http://msdn.microsoft.com/en-us/library/3c594ae3(VS.80).aspx

#  define ALLOW_THIS_IN_INITIALIZER_LIST(code) \

    MSVC_PUSH_DISABLE_WARNING(4355)            \

    code MSVC_POP_WARNING()

#else  // Not MSVC

#  define MSVC_SUPPRESS_WARNING(n)

#  define MSVC_PUSH_DISABLE_WARNING(n)

#  define MSVC_PUSH_WARNING_LEVEL(n)

#  define MSVC_POP_WARNING()

#  define MSVC_DISABLE_OPTIMIZE()

#  define MSVC_ENABLE_OPTIMIZE()

#  define ALLOW_THIS_IN_INITIALIZER_LIST(code) code

#endif  // _MSC_VER

// Annotate a function indicating the caller must examine the return value.

// Use like:

//   int foo() WARN_UNUSED_RESULT;

// To explicitly ignore a result, see |ignore_result()| in base/macros.h.

#undef WARN_UNUSED_RESULT

#if defined(__GNUC__) || defined(__clang__)

#  define WARN_UNUSED_RESULT __attribute__((warn_unused_result))

#else

#  define WARN_UNUSED_RESULT

#endif

#endif  // BASE_COMPILER_SPECIFIC_H_