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products/sources/formale Sprachen/Java/Openjdk/src/hotspot/share/runtime/ (Sun/Oracle ^©) Datei vom 13.11.2022 mit Größe 2 kB

Quelle safefetch.hpp Sprache: C

/*
* Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2022 SAP SE. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/

#ifndef SHARE_RUNTIME_SAFEFETCH_HPP
#define SHARE_RUNTIME_SAFEFETCH_HPP

#include "utilities/macros.hpp"

// Safefetch allows to load a value from a location that's not known
// to be valid. If the load causes a fault, the error value is returned.

#ifdef _WIN32
  // Windows uses Structured Exception Handling
  #include "safefetch_windows.hpp"
#elif defined(ZERO) || defined (_AIX)
  // These platforms implement safefetch via Posix sigsetjmp/longjmp.
  // This is slower than the other methods and uses more thread stack,
  // but its safe and portable.
  #include "safefetch_sigjmp.hpp"
  #define SAFEFETCH_METHOD_SIGSETJMP
#else
  // All other platforms use static assembly
  #include "safefetch_static.hpp"
  #define SAFEFETCH_METHOD_STATIC_ASSEMBLY
#endif

inline int SafeFetch32(int* adr, int errValue) {
  return SafeFetch32_impl(adr, errValue);
}

inline intptr_t SafeFetchN(intptr_t* adr, intptr_t errValue) {
  return SafeFetchN_impl(adr, errValue);
}

#endif // SHARE_RUNTIME_SAFEFETCH_HPP

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