Mercurial > hg > truffle
view src/os_cpu/windows_x86/vm/atomic_windows_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 |
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/* * 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. * */ // The following alternative implementations are needed because // Windows 95 doesn't support (some of) the corresponding Windows NT // calls. Furthermore, these versions allow inlining in the caller. // (More precisely: The documentation for InterlockedExchange says // it is supported for Windows 95. However, when single-stepping // through the assembly code we cannot step into the routine and // when looking at the routine address we see only garbage code. // Better safe then sorry!). Was bug 7/31/98 (gri). // // Performance note: On uniprocessors, the 'lock' prefixes are not // necessary (and expensive). We should generate separate cases if // this becomes a performance problem. #pragma warning(disable: 4035) // Disables warnings reporting missing return statement 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 // VC++ doesn't like the lock prefix to be on a single line // so we can't insert a label after the lock prefix. // By emitting a lock prefix, we can define a label after it. #define LOCK_IF_MP(mp) __asm cmp mp, 0 \ __asm je L0 \ __asm _emit 0xF0 \ __asm L0: #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 jint Atomic::add (jint add_value, volatile jint* dest) { return (jint)(*os::atomic_add_func)(add_value, dest); } inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) { return (intptr_t)(*os::atomic_add_ptr_func)(add_value, dest); } inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) { return (void*)(*os::atomic_add_ptr_func)(add_value, (volatile intptr_t*)dest); } 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::xchg (jint exchange_value, volatile jint* dest) { return (jint)(*os::atomic_xchg_func)(exchange_value, dest); } inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) { return (intptr_t)(os::atomic_xchg_ptr_func)(exchange_value, dest); } inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) { return (void *)(os::atomic_xchg_ptr_func)((intptr_t)exchange_value, (volatile intptr_t*)dest); } inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value) { return (*os::atomic_cmpxchg_func)(exchange_value, dest, compare_value); } inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) { return (*os::atomic_cmpxchg_long_func)(exchange_value, dest, compare_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 // !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 jint Atomic::add (jint add_value, volatile jint* dest) { int mp = os::is_MP(); __asm { mov edx, dest; mov eax, add_value; mov ecx, eax; LOCK_IF_MP(mp) xadd dword ptr [edx], eax; add eax, ecx; } } inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) { return (intptr_t)add((jint)add_value, (volatile jint*)dest); } inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) { return (void*)add((jint)add_value, (volatile jint*)dest); } inline void Atomic::inc (volatile jint* dest) { // alternative for InterlockedIncrement int mp = os::is_MP(); __asm { mov edx, dest; LOCK_IF_MP(mp) add dword ptr [edx], 1; } } inline void Atomic::inc_ptr(volatile intptr_t* dest) { inc((volatile jint*)dest); } inline void Atomic::inc_ptr(volatile void* dest) { inc((volatile jint*)dest); } inline void Atomic::dec (volatile jint* dest) { // alternative for InterlockedDecrement int mp = os::is_MP(); __asm { mov edx, dest; LOCK_IF_MP(mp) sub dword ptr [edx], 1; } } inline void Atomic::dec_ptr(volatile intptr_t* dest) { dec((volatile jint*)dest); } inline void Atomic::dec_ptr(volatile void* dest) { dec((volatile jint*)dest); } inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) { // alternative for InterlockedExchange __asm { mov eax, exchange_value; mov ecx, dest; xchg eax, dword ptr [ecx]; } } 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 void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) { return (void*)xchg((jint)exchange_value, (volatile jint*)dest); } inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value) { // alternative for InterlockedCompareExchange int mp = os::is_MP(); __asm { mov edx, dest mov ecx, exchange_value mov eax, compare_value LOCK_IF_MP(mp) cmpxchg dword ptr [edx], ecx } } inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) { int mp = os::is_MP(); jint ex_lo = (jint)exchange_value; jint ex_hi = *( ((jint*)&exchange_value) + 1 ); jint cmp_lo = (jint)compare_value; jint cmp_hi = *( ((jint*)&compare_value) + 1 ); __asm { push ebx push edi mov eax, cmp_lo mov edx, cmp_hi mov edi, dest mov ebx, ex_lo mov ecx, ex_hi LOCK_IF_MP(mp) cmpxchg8b qword ptr [edi] pop edi pop ebx } } 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 #pragma warning(default: 4035) // Enables warnings reporting missing return statement