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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 d1605aabd0a1
children c18cbe5936b8
line wrap: on
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/*
 * Copyright 1999-2008 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    (jlong    store_value, jlong*    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    (jlong    store_value, volatile jlong*    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; }

inline void Atomic::inc    (volatile jint*     dest) { (void)add    (1, dest); }
inline void Atomic::inc_ptr(volatile intptr_t* dest) { (void)add_ptr(1, dest); }
inline void Atomic::inc_ptr(volatile void*     dest) { (void)add_ptr(1, dest); }

inline void Atomic::dec    (volatile jint*     dest) { (void)add    (-1, dest); }
inline void Atomic::dec_ptr(volatile intptr_t* dest) { (void)add_ptr(-1, dest); }
inline void Atomic::dec_ptr(volatile void*     dest) { (void)add_ptr(-1, dest); }

inline jint     Atomic::add    (jint     add_value, volatile jint*     dest) {
  intptr_t rv;
  __asm__ volatile(
    "1: \n\t"
    " ld     [%2], %%o2\n\t"
    " add    %1, %%o2, %%o3\n\t"
    " cas    [%2], %%o2, %%o3\n\t"
    " cmp    %%o2, %%o3\n\t"
    " bne    1b\n\t"
    "  nop\n\t"
    " add    %1, %%o2, %0\n\t"
    : "=r" (rv)
    : "r" (add_value), "r" (dest)
    : "memory", "o2", "o3");
  return rv;
}

inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
  intptr_t rv;
#ifdef _LP64
  __asm__ volatile(
    "1: \n\t"
    " ldx    [%2], %%o2\n\t"
    " add    %0, %%o2, %%o3\n\t"
    " casx   [%2], %%o2, %%o3\n\t"
    " cmp    %%o2, %%o3\n\t"
    " bne    %%xcc, 1b\n\t"
    "  nop\n\t"
    " add    %0, %%o2, %0\n\t"
    : "=r" (rv)
    : "r" (add_value), "r" (dest)
    : "memory", "o2", "o3");
#else
  __asm__ volatile(
    "1: \n\t"
    " ld     [%2], %%o2\n\t"
    " add    %1, %%o2, %%o3\n\t"
    " cas    [%2], %%o2, %%o3\n\t"
    " cmp    %%o2, %%o3\n\t"
    " bne    1b\n\t"
    "  nop\n\t"
    " add    %1, %%o2, %0\n\t"
    : "=r" (rv)
    : "r" (add_value), "r" (dest)
    : "memory", "o2", "o3");
#endif // _LP64
  return rv;
}

inline void*    Atomic::add_ptr(intptr_t add_value, volatile void*     dest) {
  return (void*)add_ptr((intptr_t)add_value, (volatile intptr_t*)dest);
}


inline jint     Atomic::xchg    (jint     exchange_value, volatile jint*     dest) {
  intptr_t rv = exchange_value;
  __asm__ volatile(
    " swap   [%2],%1\n\t"
    : "=r" (rv)
    : "0" (exchange_value) /* we use same register as for return value */, "r" (dest)
    : "memory");
  return rv;
}

inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
  intptr_t rv = exchange_value;
#ifdef _LP64
  __asm__ volatile(
    "1:\n\t"
    " mov    %1, %%o3\n\t"
    " ldx    [%2], %%o2\n\t"
    " casx   [%2], %%o2, %%o3\n\t"
    " cmp    %%o2, %%o3\n\t"
    " bne    %%xcc, 1b\n\t"
    "  nop\n\t"
    " mov    %%o2, %0\n\t"
    : "=r" (rv)
    : "r" (exchange_value), "r" (dest)
    : "memory", "o2", "o3");
#else
  __asm__ volatile(
    "swap    [%2],%1\n\t"
    : "=r" (rv)
    : "0" (exchange_value) /* we use same register as for return value */, "r" (dest)
    : "memory");
#endif // _LP64
  return rv;
}

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) {
  jint rv;
  __asm__ volatile(
    " cas    [%2], %3, %0"
    : "=r" (rv)
    : "0" (exchange_value), "r" (dest), "r" (compare_value)
    : "memory");
  return rv;
}

inline jlong    Atomic::cmpxchg    (jlong    exchange_value, volatile jlong*    dest, jlong    compare_value) {
#ifdef _LP64
  jlong rv;
  __asm__ volatile(
    " casx   [%2], %3, %0"
    : "=r" (rv)
    : "0" (exchange_value), "r" (dest), "r" (compare_value)
    : "memory");
  return rv;
#else
  assert(VM_Version::v9_instructions_work(), "cas only supported on v9");
  volatile jlong_accessor evl, cvl, rv;
  evl.long_value = exchange_value;
  cvl.long_value = compare_value;

  __asm__ volatile(
    " sllx   %2, 32, %2\n\t"
    " srl    %3, 0,  %3\n\t"
    " or     %2, %3, %2\n\t"
    " sllx   %5, 32, %5\n\t"
    " srl    %6, 0,  %6\n\t"
    " or     %5, %6, %5\n\t"
    " casx   [%4], %5, %2\n\t"
    " srl    %2, 0, %1\n\t"
    " srlx   %2, 32, %0\n\t"
    : "=r" (rv.words[0]), "=r" (rv.words[1])
    : "r"  (evl.words[0]), "r" (evl.words[1]), "r" (dest), "r" (cvl.words[0]), "r" (cvl.words[1])
    : "memory");

  return rv.long_value;
#endif
}

inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
  intptr_t rv;
#ifdef _LP64
  __asm__ volatile(
    " casx    [%2], %3, %0"
    : "=r" (rv)
    : "0" (exchange_value), "r" (dest), "r" (compare_value)
    : "memory");
#else
  __asm__ volatile(
    " cas     [%2], %3, %0"
    : "=r" (rv)
    : "0" (exchange_value), "r" (dest), "r" (compare_value)
    : "memory");
#endif // _LP64
  return rv;
}

inline void*    Atomic::cmpxchg_ptr(void*    exchange_value, volatile void*     dest, void*    compare_value) {
  return (void*)cmpxchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest, (intptr_t)compare_value);
}