istream - mozsearch

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

 * vim: sw=2 ts=8 et :

*/

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_istream_h

#define mozilla_istream_h

#if _HAS_EXCEPTIONS

#  error "STL code can only be used with -fno-exceptions"

#endif

#if defined(__clang__)

// Silence "warning: #include_next is a language extension [-Wgnu-include-next]"

#pragma clang system_header

#endif

// Include mozalloc after the STL header and all other headers it includes

// have been preprocessed.

#if !defined(MOZ_INCLUDE_MOZALLOC_H)

#  define MOZ_INCLUDE_MOZALLOC_H

#  define MOZ_INCLUDE_MOZALLOC_H_FROM_istream

#endif

#ifdef _DEBUG

// From

//   http://msdn.microsoft.com/en-us/library/aa985982%28VS.80%29.aspx

// and

//   http://msdn.microsoft.com/en-us/library/aa985965%28VS.80%29.aspx

// there appear to be two types of STL container checking.  The

// former is enabled by -D_DEBUG (which is implied by -MDd or -MTd), and

// looks to be full generation/mutation checked iterators as done by

// _GLIBCXX_DEBUG.  The latter appears to just be bounds checking, and

// is enabled by the following macros.  It appears that the _DEBUG

// iterators subsume _SECURE_SCL, and the following settings are

// default anyway, so we'll just leave this commented out.

//#  define _SECURE_SCL 1

//#  define _SECURE_SCL_THROWS 0

#else

// Note: _SECURE_SCL iterators are on by default in opt builds.  We

// could leave them on, but since gcc doesn't, we might as well

// preserve that behavior for perf reasons.  nsTArray is in the same

// camp as gcc.  Can revisit later.

//

// FIXME/bug 551254: because we're not wrapping all the STL headers we

// use, undefining this here can cause some headers to be built with

// iterator checking and others not.  Turning this off until we have a

// better plan.

//#  undef _SECURE_SCL

#endif

#include_next <istream>

#ifdef MOZ_INCLUDE_MOZALLOC_H_FROM_istream

// See if we're in code that can use mozalloc.

#  if !defined(NS_NO_XPCOM) && !defined(MOZ_NO_MOZALLOC)

//   In recent versions of MSVC, <new>, which mozalloc.h includes, uses

//   <type_traits> without including it. Before MSVC 17.7, this worked

//   fine because <new> included <exception>, which includes <type_traits>.

//   That is still the case, but it now also includes <cstdlib> before

//   <type_traits>, so when something includes <exception> before <new>,

//   we get here before <type_traits> is included, which ends up not working.

#    include <type_traits>

#    include "mozilla/mozalloc.h"

#  else

#    error "STL code can only be used with infallible ::operator new()"

#  endif

#endif

#endif  // if mozilla_istream_h