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/*
* Copyright (c) 1999, 2005, 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.
*
*/
// 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
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