Mercurial > hg > truffle
view src/os_cpu/linux_x86/vm/atomic_linux_x86.inline.hpp @ 453:c96030fff130
6684579: SoftReference processing can be made more efficient
Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not.
Reviewed-by: jmasa
author | ysr |
---|---|
date | Thu, 20 Nov 2008 16:56:09 -0800 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
line wrap: on
line source
/* * Copyright 1999-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ // Implementation of class atomic inline void Atomic::store (jbyte store_value, jbyte* dest) { *dest = store_value; } inline void Atomic::store (jshort store_value, jshort* dest) { *dest = store_value; } inline void Atomic::store (jint store_value, jint* dest) { *dest = store_value; } inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; } inline void Atomic::store_ptr(void* store_value, void* dest) { *(void**)dest = store_value; } inline void Atomic::store (jbyte store_value, volatile jbyte* dest) { *dest = store_value; } inline void Atomic::store (jshort store_value, volatile jshort* dest) { *dest = store_value; } inline void Atomic::store (jint store_value, volatile jint* dest) { *dest = store_value; } inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; } inline void Atomic::store_ptr(void* store_value, volatile void* dest) { *(void* volatile *)dest = store_value; } // Adding a lock prefix to an instruction on MP machine #define LOCK_IF_MP(mp) "cmp $0, " #mp "; je 1f; lock; 1: " inline jint Atomic::add (jint add_value, volatile jint* dest) { jint addend = add_value; int mp = os::is_MP(); __asm__ volatile ( LOCK_IF_MP(%3) "xaddl %0,(%2)" : "=r" (addend) : "0" (addend), "r" (dest), "r" (mp) : "cc", "memory"); return addend + add_value; } inline void Atomic::inc (volatile jint* dest) { int mp = os::is_MP(); __asm__ volatile (LOCK_IF_MP(%1) "addl $1,(%0)" : : "r" (dest), "r" (mp) : "cc", "memory"); } inline void Atomic::inc_ptr(volatile void* dest) { inc_ptr((volatile intptr_t*)dest); } inline void Atomic::dec (volatile jint* dest) { int mp = os::is_MP(); __asm__ volatile (LOCK_IF_MP(%1) "subl $1,(%0)" : : "r" (dest), "r" (mp) : "cc", "memory"); } inline void Atomic::dec_ptr(volatile void* dest) { dec_ptr((volatile intptr_t*)dest); } inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) { __asm__ volatile ( "xchgl (%2),%0" : "=r" (exchange_value) : "0" (exchange_value), "r" (dest) : "memory"); return exchange_value; } inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) { return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest); } inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value) { int mp = os::is_MP(); __asm__ volatile (LOCK_IF_MP(%4) "cmpxchgl %1,(%3)" : "=a" (exchange_value) : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp) : "cc", "memory"); return exchange_value; } extern "C" { // defined in linux_x86.s jlong _Atomic_cmpxchg_long(jlong, volatile jlong*, jlong, bool); } #ifdef AMD64 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; } inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; } inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) { intptr_t addend = add_value; bool mp = os::is_MP(); __asm__ __volatile__ (LOCK_IF_MP(%3) "xaddq %0,(%2)" : "=r" (addend) : "0" (addend), "r" (dest), "r" (mp) : "cc", "memory"); return addend + add_value; } inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) { return (void*)add_ptr(add_value, (volatile intptr_t*)dest); } inline void Atomic::inc_ptr(volatile intptr_t* dest) { bool mp = os::is_MP(); __asm__ __volatile__ (LOCK_IF_MP(%1) "addq $1,(%0)" : : "r" (dest), "r" (mp) : "cc", "memory"); } inline void Atomic::dec_ptr(volatile intptr_t* dest) { bool mp = os::is_MP(); __asm__ __volatile__ (LOCK_IF_MP(%1) "subq $1,(%0)" : : "r" (dest), "r" (mp) : "cc", "memory"); } inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) { __asm__ __volatile__ ("xchgq (%2),%0" : "=r" (exchange_value) : "0" (exchange_value), "r" (dest) : "memory"); return exchange_value; } inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) { bool mp = os::is_MP(); __asm__ __volatile__ (LOCK_IF_MP(%4) "cmpxchgq %1,(%3)" : "=a" (exchange_value) : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp) : "cc", "memory"); return exchange_value; } inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) { return (intptr_t)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value); } inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) { return (void*)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value); } #else //inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; } //inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; } inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) { return (intptr_t)Atomic::add((jint)add_value, (volatile jint*)dest); } inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) { return (void*)Atomic::add((jint)add_value, (volatile jint*)dest); } inline void Atomic::inc_ptr(volatile intptr_t* dest) { inc((volatile jint*)dest); } inline void Atomic::dec_ptr(volatile intptr_t* dest) { dec((volatile jint*)dest); } inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) { return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest); } inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) { return _Atomic_cmpxchg_long(exchange_value, dest, compare_value, os::is_MP()); } inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) { return (intptr_t)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value); } inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) { return (void*)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value); } #endif // AMD64