mirror of
https://github.com/openjdk/jdk.git
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8150921: Update Unsafe getters/setters to use double-register variants
Reviewed-by: dholmes, shade, psandoz, jrose
This commit is contained in:
Mikael Vidstedt
parent
0588e8953c
commit
fd9f92e18d
7 changed files with 251 additions and 408 deletions
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@ -131,38 +131,137 @@ jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
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}
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///// Data in the Java heap.
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///// Data read/writes on the Java heap and in native (off-heap) memory
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#define truncate_jboolean(x) ((x) & 1)
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#define truncate_jbyte(x) (x)
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#define truncate_jshort(x) (x)
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#define truncate_jchar(x) (x)
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#define truncate_jint(x) (x)
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#define truncate_jlong(x) (x)
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#define truncate_jfloat(x) (x)
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#define truncate_jdouble(x) (x)
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/**
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* Helper class for accessing memory.
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*
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* Normalizes values and wraps accesses in
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* JavaThread::doing_unsafe_access() if needed.
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*/
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class MemoryAccess : StackObj {
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JavaThread* _thread;
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jobject _obj;
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jlong _offset;
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#define GET_FIELD(obj, offset, type_name, v) \
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oop p = JNIHandles::resolve(obj); \
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type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
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// Resolves and returns the address of the memory access
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void* addr() {
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return index_oop_from_field_offset_long(JNIHandles::resolve(_obj), _offset);
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}
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#define SET_FIELD(obj, offset, type_name, x) \
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oop p = JNIHandles::resolve(obj); \
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*(type_name*)index_oop_from_field_offset_long(p, offset) = truncate_##type_name(x)
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template <typename T>
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T normalize(T x) {
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return x;
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}
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#define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
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oop p = JNIHandles::resolve(obj); \
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if (support_IRIW_for_not_multiple_copy_atomic_cpu) { \
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OrderAccess::fence(); \
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} \
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volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
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jboolean normalize(jboolean x) {
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return x & 1;
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}
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#define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
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oop p = JNIHandles::resolve(obj); \
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OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), truncate_##type_name(x));
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/**
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* Helper class to wrap memory accesses in JavaThread::doing_unsafe_access()
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*/
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class GuardUnsafeAccess {
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JavaThread* _thread;
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bool _active;
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public:
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GuardUnsafeAccess(JavaThread* thread, jobject _obj) : _thread(thread) {
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if (JNIHandles::resolve(_obj) == NULL) {
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// native/off-heap access which may raise SIGBUS if accessing
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// memory mapped file data in a region of the file which has
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// been truncated and is now invalid
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_thread->set_doing_unsafe_access(true);
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_active = true;
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} else {
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_active = false;
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}
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}
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~GuardUnsafeAccess() {
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if (_active) {
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_thread->set_doing_unsafe_access(false);
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}
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}
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};
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public:
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MemoryAccess(JavaThread* thread, jobject obj, jlong offset)
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: _thread(thread), _obj(obj), _offset(offset) {
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}
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template <typename T>
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T get() {
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GuardUnsafeAccess guard(_thread, _obj);
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T* p = (T*)addr();
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T x = *p;
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return x;
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}
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template <typename T>
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void put(T x) {
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GuardUnsafeAccess guard(_thread, _obj);
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T* p = (T*)addr();
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*p = normalize(x);
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}
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// Get/SetObject must be special-cased, since it works with handles.
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template <typename T>
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T get_volatile() {
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GuardUnsafeAccess guard(_thread, _obj);
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T* p = (T*)addr();
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if (support_IRIW_for_not_multiple_copy_atomic_cpu) {
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OrderAccess::fence();
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}
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T x = OrderAccess::load_acquire((volatile T*)p);
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return x;
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}
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template <typename T>
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void put_volatile(T x) {
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GuardUnsafeAccess guard(_thread, _obj);
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T* p = (T*)addr();
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OrderAccess::release_store_fence((volatile T*)p, normalize(x));
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}
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#ifndef SUPPORTS_NATIVE_CX8
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jlong get_jlong_locked() {
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GuardUnsafeAccess guard(_thread, _obj);
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MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
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jlong* p = (jlong*)addr();
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jlong x = Atomic::load(p);
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return x;
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}
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void put_jlong_locked(jlong x) {
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GuardUnsafeAccess guard(_thread, _obj);
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MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
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jlong* p = (jlong*)addr();
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Atomic::store(normalize(x), p);
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}
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#endif
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};
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// Get/PutObject must be special-cased, since it works with handles.
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// These functions allow a null base pointer with an arbitrary address.
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// But if the base pointer is non-null, the offset should make some sense.
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@ -208,7 +307,7 @@ UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj,
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return ret;
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} UNSAFE_END
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UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) {
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UNSAFE_ENTRY(void, Unsafe_PutObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) {
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oop x = JNIHandles::resolve(x_h);
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oop p = JNIHandles::resolve(obj);
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@ -236,7 +335,7 @@ UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobj
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return JNIHandles::make_local(env, v);
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} UNSAFE_END
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UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) {
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UNSAFE_ENTRY(void, Unsafe_PutObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) {
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oop x = JNIHandles::resolve(x_h);
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oop p = JNIHandles::resolve(obj);
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void* addr = index_oop_from_field_offset_long(p, offset);
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@ -301,25 +400,17 @@ UNSAFE_ENTRY(jlong, Unsafe_GetKlassPointer(JNIEnv *env, jobject unsafe, jobject
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UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) {
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if (VM_Version::supports_cx8()) {
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GET_FIELD_VOLATILE(obj, offset, jlong, v);
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return v;
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return MemoryAccess(thread, obj, offset).get_volatile<jlong>();
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} else {
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Handle p (THREAD, JNIHandles::resolve(obj));
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jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
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MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
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jlong value = Atomic::load(addr);
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return value;
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return MemoryAccess(thread, obj, offset).get_jlong_locked();
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}
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} UNSAFE_END
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UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) {
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UNSAFE_ENTRY(void, Unsafe_PutLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) {
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if (VM_Version::supports_cx8()) {
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SET_FIELD_VOLATILE(obj, offset, jlong, x);
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MemoryAccess(thread, obj, offset).put_volatile<jlong>(x);
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} else {
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Handle p (THREAD, JNIHandles::resolve(obj));
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jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
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MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
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Atomic::store(x, addr);
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MemoryAccess(thread, obj, offset).put_jlong_locked(x);
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}
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} UNSAFE_END
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@ -337,15 +428,14 @@ UNSAFE_LEAF(jint, Unsafe_unalignedAccess0(JNIEnv *env, jobject unsafe)) {
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return UseUnalignedAccesses;
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} UNSAFE_END
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#define DEFINE_GETSETOOP(java_type, Type) \
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#define DEFINE_GETSETOOP(java_type, Type) \
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\
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UNSAFE_ENTRY(java_type, Unsafe_Get##Type(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) { \
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GET_FIELD(obj, offset, java_type, v); \
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return v; \
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return MemoryAccess(thread, obj, offset).get<java_type>(); \
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} UNSAFE_END \
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\
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UNSAFE_ENTRY(void, Unsafe_Set##Type(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, java_type x)) { \
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SET_FIELD(obj, offset, java_type, x); \
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UNSAFE_ENTRY(void, Unsafe_Put##Type(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, java_type x)) { \
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MemoryAccess(thread, obj, offset).put<java_type>(x); \
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} UNSAFE_END \
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\
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// END DEFINE_GETSETOOP.
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@ -364,12 +454,11 @@ DEFINE_GETSETOOP(jdouble, Double);
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#define DEFINE_GETSETOOP_VOLATILE(java_type, Type) \
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\
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UNSAFE_ENTRY(java_type, Unsafe_Get##Type##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) { \
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GET_FIELD_VOLATILE(obj, offset, java_type, v); \
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return v; \
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return MemoryAccess(thread, obj, offset).get_volatile<java_type>(); \
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} UNSAFE_END \
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\
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UNSAFE_ENTRY(void, Unsafe_Set##Type##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, java_type x)) { \
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SET_FIELD_VOLATILE(obj, offset, java_type, x); \
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UNSAFE_ENTRY(void, Unsafe_Put##Type##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, java_type x)) { \
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MemoryAccess(thread, obj, offset).put_volatile<java_type>(x); \
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} UNSAFE_END \
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\
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// END DEFINE_GETSETOOP_VOLATILE.
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@ -400,98 +489,6 @@ UNSAFE_LEAF(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe)) {
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OrderAccess::fence();
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} UNSAFE_END
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////// Data in the C heap.
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// Note: These do not throw NullPointerException for bad pointers.
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// They just crash. Only a oop base pointer can generate a NullPointerException.
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//
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#define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
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\
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UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) { \
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void* p = addr_from_java(addr); \
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JavaThread* t = JavaThread::current(); \
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t->set_doing_unsafe_access(true); \
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java_type x = *(volatile native_type*)p; \
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t->set_doing_unsafe_access(false); \
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return x; \
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} UNSAFE_END \
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\
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UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) { \
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JavaThread* t = JavaThread::current(); \
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t->set_doing_unsafe_access(true); \
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void* p = addr_from_java(addr); \
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*(volatile native_type*)p = x; \
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t->set_doing_unsafe_access(false); \
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} UNSAFE_END \
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\
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// END DEFINE_GETSETNATIVE.
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DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
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DEFINE_GETSETNATIVE(jshort, Short, signed short);
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DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
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DEFINE_GETSETNATIVE(jint, Int, jint);
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// no long -- handled specially
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DEFINE_GETSETNATIVE(jfloat, Float, float);
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DEFINE_GETSETNATIVE(jdouble, Double, double);
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#undef DEFINE_GETSETNATIVE
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UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr)) {
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JavaThread* t = JavaThread::current();
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// We do it this way to avoid problems with access to heap using 64
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// bit loads, as jlong in heap could be not 64-bit aligned, and on
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// some CPUs (SPARC) it leads to SIGBUS.
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t->set_doing_unsafe_access(true);
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void* p = addr_from_java(addr);
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jlong x;
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if (is_ptr_aligned(p, sizeof(jlong)) == 0) {
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// jlong is aligned, do a volatile access
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x = *(volatile jlong*)p;
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} else {
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jlong_accessor acc;
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acc.words[0] = ((volatile jint*)p)[0];
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acc.words[1] = ((volatile jint*)p)[1];
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x = acc.long_value;
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}
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t->set_doing_unsafe_access(false);
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return x;
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} UNSAFE_END
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UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) {
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JavaThread* t = JavaThread::current();
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// see comment for Unsafe_GetNativeLong
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t->set_doing_unsafe_access(true);
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void* p = addr_from_java(addr);
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if (is_ptr_aligned(p, sizeof(jlong))) {
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// jlong is aligned, do a volatile access
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*(volatile jlong*)p = x;
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} else {
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jlong_accessor acc;
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acc.long_value = x;
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((volatile jint*)p)[0] = acc.words[0];
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((volatile jint*)p)[1] = acc.words[1];
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}
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t->set_doing_unsafe_access(false);
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} UNSAFE_END
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UNSAFE_LEAF(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr)) {
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void* p = addr_from_java(addr);
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return addr_to_java(*(void**)p);
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} UNSAFE_END
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UNSAFE_LEAF(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) {
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void* p = addr_from_java(addr);
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*(void**)p = addr_from_java(x);
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} UNSAFE_END
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////// Allocation requests
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UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls)) {
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@ -980,8 +977,8 @@ UNSAFE_ENTRY(jint, Unsafe_CompareAndExchangeInt(JNIEnv *env, jobject unsafe, job
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} UNSAFE_END
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UNSAFE_ENTRY(jlong, Unsafe_CompareAndExchangeLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x)) {
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Handle p (THREAD, JNIHandles::resolve(obj));
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jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
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Handle p(THREAD, JNIHandles::resolve(obj));
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jlong* addr = (jlong*)index_oop_from_field_offset_long(p(), offset);
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#ifdef SUPPORTS_NATIVE_CX8
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return (jlong)(Atomic::cmpxchg(x, addr, e));
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@ -1017,7 +1014,7 @@ UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe,
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UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x)) {
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oop p = JNIHandles::resolve(obj);
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jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
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jint* addr = (jint *)index_oop_from_field_offset_long(p, offset);
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return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
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} UNSAFE_END
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@ -1143,20 +1140,16 @@ UNSAFE_ENTRY(jint, Unsafe_GetLoadAverage0(JNIEnv *env, jobject unsafe, jdoubleAr
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#define DECLARE_GETPUTOOP(Type, Desc) \
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{CC "get" #Type, CC "(" OBJ "J)" #Desc, FN_PTR(Unsafe_Get##Type)}, \
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{CC "put" #Type, CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Set##Type)}, \
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{CC "put" #Type, CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Put##Type)}, \
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{CC "get" #Type "Volatile", CC "(" OBJ "J)" #Desc, FN_PTR(Unsafe_Get##Type##Volatile)}, \
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{CC "put" #Type "Volatile", CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Set##Type##Volatile)}
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{CC "put" #Type "Volatile", CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Put##Type##Volatile)}
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#define DECLARE_GETPUTNATIVE(Byte, B) \
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{CC "get" #Byte, CC "(" ADR ")" #B, FN_PTR(Unsafe_GetNative##Byte)}, \
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{CC "put" #Byte, CC "(" ADR#B ")V", FN_PTR(Unsafe_SetNative##Byte)}
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static JNINativeMethod jdk_internal_misc_Unsafe_methods[] = {
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{CC "getObject", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObject)},
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{CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObject)},
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{CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_PutObject)},
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{CC "getObjectVolatile",CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObjectVolatile)},
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{CC "putObjectVolatile",CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObjectVolatile)},
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{CC "putObjectVolatile",CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_PutObjectVolatile)},
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{CC "getUncompressedObject", CC "(" ADR ")" OBJ, FN_PTR(Unsafe_GetUncompressedObject)},
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{CC "getJavaMirror", CC "(" ADR ")" CLS, FN_PTR(Unsafe_GetJavaMirror)},
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|
|
@ -1171,17 +1164,6 @@ static JNINativeMethod jdk_internal_misc_Unsafe_methods[] = {
|
|||
DECLARE_GETPUTOOP(Float, F),
|
||||
DECLARE_GETPUTOOP(Double, D),
|
||||
|
||||
DECLARE_GETPUTNATIVE(Byte, B),
|
||||
DECLARE_GETPUTNATIVE(Short, S),
|
||||
DECLARE_GETPUTNATIVE(Char, C),
|
||||
DECLARE_GETPUTNATIVE(Int, I),
|
||||
DECLARE_GETPUTNATIVE(Long, J),
|
||||
DECLARE_GETPUTNATIVE(Float, F),
|
||||
DECLARE_GETPUTNATIVE(Double, D),
|
||||
|
||||
{CC "getAddress", CC "(" ADR ")" ADR, FN_PTR(Unsafe_GetNativeAddress)},
|
||||
{CC "putAddress", CC "(" ADR "" ADR ")V", FN_PTR(Unsafe_SetNativeAddress)},
|
||||
|
||||
{CC "allocateMemory0", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory0)},
|
||||
{CC "reallocateMemory0", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory0)},
|
||||
{CC "freeMemory0", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory0)},
|
||||
|
|
@ -1239,7 +1221,6 @@ static JNINativeMethod jdk_internal_misc_Unsafe_methods[] = {
|
|||
#undef DAC_Args
|
||||
|
||||
#undef DECLARE_GETPUTOOP
|
||||
#undef DECLARE_GETPUTNATIVE
|
||||
|
||||
|
||||
// This function is exported, used by NativeLookup.
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue