Mercurial > hg > truffle
view src/share/vm/runtime/prefetch.hpp @ 12146:9758d9f36299
8021954: VM SIGSEGV during classloading on MacOS; hs_err_pid file produced
Summary: declare all user-defined operator new()s within Hotspot code with the empty throw() exception specification
Reviewed-by: coleenp, twisti, dholmes, hseigel, dcubed, kvn, ccheung
Contributed-by: lois.foltan@oracle.com
author | coleenp |
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date | Thu, 29 Aug 2013 18:56:29 -0400 |
parents | f95d63e2154a |
children |
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/* * Copyright (c) 2003, 2010, Oracle and/or its affiliates. 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_VM_RUNTIME_PREFETCH_HPP #define SHARE_VM_RUNTIME_PREFETCH_HPP #include "memory/allocation.hpp" // If calls to prefetch methods are in a loop, the loop should be cloned // such that if Prefetch{Scan,Copy}Interval and/or PrefetchFieldInterval // say not to do prefetching, these methods aren't called. At the very // least, they take up a memory issue slot. They should be implemented // as inline assembly code: doing an actual call isn't worth the cost. class Prefetch : AllStatic { public: enum style { do_none, // Do no prefetching do_read, // Do read prefetching do_write // Do write prefetching }; // Prefetch anticipating read; must not fault, semantically a no-op static void read(void* loc, intx interval); // Prefetch anticipating write; must not fault, semantically a no-op static void write(void* loc, intx interval); }; #endif // SHARE_VM_RUNTIME_PREFETCH_HPP