2007-12-01 00:00:00 +00:00
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/*
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2008-07-02 12:55:16 -07:00
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* Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved.
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2007-12-01 00:00:00 +00:00
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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# include "incls/_precompiled.incl"
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# include "incls/_atomic.cpp.incl"
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jbyte Atomic::cmpxchg(jbyte exchange_value, volatile jbyte* dest, jbyte compare_value) {
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assert(sizeof(jbyte) == 1, "assumption.");
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uintptr_t dest_addr = (uintptr_t)dest;
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uintptr_t offset = dest_addr % sizeof(jint);
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volatile jint* dest_int = (volatile jint*)(dest_addr - offset);
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jint cur = *dest_int;
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jbyte* cur_as_bytes = (jbyte*)(&cur);
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jint new_val = cur;
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jbyte* new_val_as_bytes = (jbyte*)(&new_val);
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new_val_as_bytes[offset] = exchange_value;
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while (cur_as_bytes[offset] == compare_value) {
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jint res = cmpxchg(new_val, dest_int, cur);
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if (res == cur) break;
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cur = res;
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new_val = cur;
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new_val_as_bytes[offset] = exchange_value;
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}
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return cur_as_bytes[offset];
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}
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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv
Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
2008-04-13 17:43:42 -04:00
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unsigned Atomic::xchg(unsigned int exchange_value, volatile unsigned int* dest) {
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assert(sizeof(unsigned int) == sizeof(jint), "more work to do");
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return (unsigned int)Atomic::xchg((jint)exchange_value, (volatile jint*)dest);
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}
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unsigned Atomic::cmpxchg(unsigned int exchange_value,
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volatile unsigned int* dest, unsigned int compare_value) {
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assert(sizeof(unsigned int) == sizeof(jint), "more work to do");
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return (unsigned int)Atomic::cmpxchg((jint)exchange_value, (volatile jint*)dest,
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(jint)compare_value);
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}
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