15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "classfile/classFileStream.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/classLoadInfo.hpp"
28 #include "classfile/javaClasses.inline.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "jfr/jfrEvents.hpp"
32 #include "jni.h"
33 #include "jvm.h"
34 #include "memory/allocation.inline.hpp"
35 #include "memory/resourceArea.hpp"
36 #include "oops/access.inline.hpp"
37 #include "oops/fieldStreams.inline.hpp"
38 #include "oops/instanceKlass.inline.hpp"
39 #include "oops/klass.inline.hpp"
40 #include "oops/objArrayOop.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "oops/typeArrayOop.inline.hpp"
43 #include "prims/jvmtiExport.hpp"
44 #include "prims/unsafe.hpp"
45 #include "runtime/globals.hpp"
46 #include "runtime/handles.inline.hpp"
47 #include "runtime/interfaceSupport.inline.hpp"
48 #include "runtime/javaThread.inline.hpp"
49 #include "runtime/jniHandles.inline.hpp"
50 #include "runtime/orderAccess.hpp"
51 #include "runtime/reflection.hpp"
52 #include "runtime/sharedRuntime.hpp"
53 #include "runtime/stubRoutines.hpp"
54 #include "runtime/threadSMR.hpp"
55 #include "runtime/vmOperations.hpp"
56 #include "runtime/vm_version.hpp"
57 #include "sanitizers/ub.hpp"
58 #include "services/threadService.hpp"
59 #include "utilities/align.hpp"
60 #include "utilities/copy.hpp"
61 #include "utilities/dtrace.hpp"
62 #include "utilities/macros.hpp"
63
64 /**
151 }
152 #endif
153 }
154
155 static inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
156 assert_field_offset_sane(p, field_offset);
157 uintptr_t base_address = cast_from_oop<uintptr_t>(p);
158 uintptr_t byte_offset = (uintptr_t)field_offset_to_byte_offset(field_offset);
159 return (void*)(base_address + byte_offset);
160 }
161
162 // Externally callable versions:
163 // (Use these in compiler intrinsics which emulate unsafe primitives.)
164 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
165 return field_offset;
166 }
167 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
168 return byte_offset;
169 }
170
171
172 ///// Data read/writes on the Java heap and in native (off-heap) memory
173
174 /**
175 * Helper class to wrap memory accesses in JavaThread::doing_unsafe_access()
176 */
177 class GuardUnsafeAccess {
178 JavaThread* _thread;
179
180 public:
181 GuardUnsafeAccess(JavaThread* thread) : _thread(thread) {
182 // native/off-heap access which may raise SIGBUS if accessing
183 // memory mapped file data in a region of the file which has
184 // been truncated and is now invalid.
185 _thread->set_doing_unsafe_access(true);
186 }
187
188 ~GuardUnsafeAccess() {
189 _thread->set_doing_unsafe_access(false);
190 }
191 };
230 jboolean normalize_for_read(jboolean x) {
231 return x != 0;
232 }
233
234 public:
235 MemoryAccess(JavaThread* thread, jobject obj, jlong offset)
236 : _thread(thread), _obj(JNIHandles::resolve(obj)), _offset((ptrdiff_t)offset) {
237 assert_field_offset_sane(_obj, offset);
238 }
239
240 T get() {
241 GuardUnsafeAccess guard(_thread);
242 return normalize_for_read(*addr());
243 }
244
245 // we use this method at some places for writing to 0 e.g. to cause a crash;
246 // ubsan does not know that this is the desired behavior
247 ATTRIBUTE_NO_UBSAN
248 void put(T x) {
249 GuardUnsafeAccess guard(_thread);
250 *addr() = normalize_for_write(x);
251 }
252
253
254 T get_volatile() {
255 GuardUnsafeAccess guard(_thread);
256 volatile T ret = RawAccess<MO_SEQ_CST>::load(addr());
257 return normalize_for_read(ret);
258 }
259
260 void put_volatile(T x) {
261 GuardUnsafeAccess guard(_thread);
262 RawAccess<MO_SEQ_CST>::store(addr(), normalize_for_write(x));
263 }
264 };
265
266 // These functions allow a null base pointer with an arbitrary address.
267 // But if the base pointer is non-null, the offset should make some sense.
268 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
269 UNSAFE_ENTRY(jobject, Unsafe_GetReference(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) {
270 oop p = JNIHandles::resolve(obj);
271 assert_field_offset_sane(p, offset);
272 oop v = HeapAccess<ON_UNKNOWN_OOP_REF>::oop_load_at(p, offset);
273 return JNIHandles::make_local(THREAD, v);
274 } UNSAFE_END
275
276 UNSAFE_ENTRY(void, Unsafe_PutReference(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) {
277 oop x = JNIHandles::resolve(x_h);
278 oop p = JNIHandles::resolve(obj);
279 assert_field_offset_sane(p, offset);
280 HeapAccess<ON_UNKNOWN_OOP_REF>::oop_store_at(p, offset, x);
281 } UNSAFE_END
282
283 UNSAFE_ENTRY(jobject, Unsafe_GetReferenceVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) {
284 oop p = JNIHandles::resolve(obj);
285 assert_field_offset_sane(p, offset);
286 oop v = HeapAccess<MO_SEQ_CST | ON_UNKNOWN_OOP_REF>::oop_load_at(p, offset);
287 return JNIHandles::make_local(THREAD, v);
288 } UNSAFE_END
289
290 UNSAFE_ENTRY(void, Unsafe_PutReferenceVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) {
291 oop x = JNIHandles::resolve(x_h);
292 oop p = JNIHandles::resolve(obj);
293 assert_field_offset_sane(p, offset);
294 HeapAccess<MO_SEQ_CST | ON_UNKNOWN_OOP_REF>::oop_store_at(p, offset, x);
295 } UNSAFE_END
296
297 UNSAFE_ENTRY(jobject, Unsafe_GetUncompressedObject(JNIEnv *env, jobject unsafe, jlong addr)) {
298 oop v = *(oop*) (address) addr;
299 return JNIHandles::make_local(THREAD, v);
300 } UNSAFE_END
301
302 #define DEFINE_GETSETOOP(java_type, Type) \
583 return false;
584 }
585 UNSAFE_END
586
587 static void getBaseAndScale(int& base, int& scale, jclass clazz, TRAPS) {
588 assert(clazz != nullptr, "clazz must not be null");
589
590 oop mirror = JNIHandles::resolve_non_null(clazz);
591 Klass* k = java_lang_Class::as_Klass(mirror);
592
593 if (k == nullptr || !k->is_array_klass()) {
594 THROW(vmSymbols::java_lang_InvalidClassException());
595 } else if (k->is_objArray_klass()) {
596 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
597 scale = heapOopSize;
598 } else if (k->is_typeArray_klass()) {
599 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
600 base = tak->array_header_in_bytes();
601 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
602 scale = (1 << tak->log2_element_size());
603 } else {
604 ShouldNotReachHere();
605 }
606 }
607
608 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset0(JNIEnv *env, jobject unsafe, jclass clazz)) {
609 int base = 0, scale = 0;
610 getBaseAndScale(base, scale, clazz, CHECK_0);
611
612 return field_offset_from_byte_offset(base);
613 } UNSAFE_END
614
615
616 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale0(JNIEnv *env, jobject unsafe, jclass clazz)) {
617 int base = 0, scale = 0;
618 getBaseAndScale(base, scale, clazz, CHECK_0);
619
620 // This VM packs both fields and array elements down to the byte.
621 // But watch out: If this changes, so that array references for
622 // a given primitive type (say, T_BOOLEAN) use different memory units
623 // than fields, this method MUST return zero for such arrays.
624 // For example, the VM used to store sub-word sized fields in full
625 // words in the object layout, so that accessors like getByte(Object,int)
626 // did not really do what one might expect for arrays. Therefore,
627 // this function used to report a zero scale factor, so that the user
628 // would know not to attempt to access sub-word array elements.
629 // // Code for unpacked fields:
630 // if (scale < wordSize) return 0;
631
632 // The following allows for a pretty general fieldOffset cookie scheme,
633 // but requires it to be linear in byte offset.
634 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
635 } UNSAFE_END
636
637
638 static inline void throw_new(JNIEnv *env, const char *ename) {
639 jclass cls = env->FindClass(ename);
640 if (env->ExceptionCheck()) {
641 env->ExceptionClear();
642 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", ename);
643 return;
644 }
645
646 env->ThrowNew(cls, nullptr);
647 }
648
649 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
650 // Code lifted from JDK 1.3 ClassLoader.c
651
652 jbyte *body;
653 char *utfName = nullptr;
654 jclass result = nullptr;
655 char buf[128];
656
657 assert(data != nullptr, "Class bytes must not be null");
837
838
839 /// JVM_RegisterUnsafeMethods
840
841 #define ADR "J"
842
843 #define LANG "Ljava/lang/"
844
845 #define OBJ LANG "Object;"
846 #define CLS LANG "Class;"
847 #define FLD LANG "reflect/Field;"
848 #define THR LANG "Throwable;"
849
850 #define DC_Args LANG "String;[BII" LANG "ClassLoader;" "Ljava/security/ProtectionDomain;"
851 #define DAC_Args CLS "[B[" OBJ
852
853 #define CC (char*) /*cast a literal from (const char*)*/
854 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
855
856 #define DECLARE_GETPUTOOP(Type, Desc) \
857 {CC "get" #Type, CC "(" OBJ "J)" #Desc, FN_PTR(Unsafe_Get##Type)}, \
858 {CC "put" #Type, CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Put##Type)}, \
859 {CC "get" #Type "Volatile", CC "(" OBJ "J)" #Desc, FN_PTR(Unsafe_Get##Type##Volatile)}, \
860 {CC "put" #Type "Volatile", CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Put##Type##Volatile)}
861
862
863 static JNINativeMethod jdk_internal_misc_Unsafe_methods[] = {
864 {CC "getReference", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetReference)},
865 {CC "putReference", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_PutReference)},
866 {CC "getReferenceVolatile", CC "(" OBJ "J)" OBJ, FN_PTR(Unsafe_GetReferenceVolatile)},
867 {CC "putReferenceVolatile", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_PutReferenceVolatile)},
868
869 {CC "getUncompressedObject", CC "(" ADR ")" OBJ, FN_PTR(Unsafe_GetUncompressedObject)},
870
871 DECLARE_GETPUTOOP(Boolean, Z),
872 DECLARE_GETPUTOOP(Byte, B),
873 DECLARE_GETPUTOOP(Short, S),
874 DECLARE_GETPUTOOP(Char, C),
875 DECLARE_GETPUTOOP(Int, I),
876 DECLARE_GETPUTOOP(Long, J),
877 DECLARE_GETPUTOOP(Float, F),
878 DECLARE_GETPUTOOP(Double, D),
879
880 {CC "allocateMemory0", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory0)},
881 {CC "reallocateMemory0", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory0)},
882 {CC "freeMemory0", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory0)},
883
884 {CC "objectFieldOffset0", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset0)},
885 {CC "objectFieldOffset1", CC "(" CLS LANG "String;)J", FN_PTR(Unsafe_ObjectFieldOffset1)},
886 {CC "staticFieldOffset0", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset0)},
887 {CC "staticFieldBase0", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBase0)},
888 {CC "ensureClassInitialized0", CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized0)},
889 {CC "arrayBaseOffset0", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset0)},
890 {CC "arrayIndexScale0", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale0)},
891
892 {CC "defineClass0", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)},
893 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
894 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)},
895 {CC "compareAndSetReference",CC "(" OBJ "J" OBJ "" OBJ ")Z", FN_PTR(Unsafe_CompareAndSetReference)},
896 {CC "compareAndSetInt", CC "(" OBJ "J""I""I"")Z", FN_PTR(Unsafe_CompareAndSetInt)},
897 {CC "compareAndSetLong", CC "(" OBJ "J""J""J"")Z", FN_PTR(Unsafe_CompareAndSetLong)},
898 {CC "compareAndExchangeReference", CC "(" OBJ "J" OBJ "" OBJ ")" OBJ, FN_PTR(Unsafe_CompareAndExchangeReference)},
899 {CC "compareAndExchangeInt", CC "(" OBJ "J""I""I"")I", FN_PTR(Unsafe_CompareAndExchangeInt)},
900 {CC "compareAndExchangeLong", CC "(" OBJ "J""J""J"")J", FN_PTR(Unsafe_CompareAndExchangeLong)},
901
902 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)},
903 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)},
904
905 {CC "getLoadAverage0", CC "([DI)I", FN_PTR(Unsafe_GetLoadAverage0)},
906
907 {CC "copyMemory0", CC "(" OBJ "J" OBJ "JJ)V", FN_PTR(Unsafe_CopyMemory0)},
908 {CC "copySwapMemory0", CC "(" OBJ "J" OBJ "JJJ)V", FN_PTR(Unsafe_CopySwapMemory0)},
909 {CC "writeback0", CC "(" "J" ")V", FN_PTR(Unsafe_WriteBack0)},
910 {CC "writebackPreSync0", CC "()V", FN_PTR(Unsafe_WriteBackPreSync0)},
|
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "classfile/classFileStream.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/classLoadInfo.hpp"
28 #include "classfile/javaClasses.inline.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "jfr/jfrEvents.hpp"
32 #include "jni.h"
33 #include "jvm.h"
34 #include "memory/allocation.inline.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "logging/log.hpp"
38 #include "logging/logStream.hpp"
39 #include "oops/access.inline.hpp"
40 #include "oops/fieldStreams.inline.hpp"
41 #include "oops/flatArrayKlass.hpp"
42 #include "oops/flatArrayOop.inline.hpp"
43 #include "oops/inlineKlass.inline.hpp"
44 #include "oops/instanceKlass.inline.hpp"
45 #include "oops/klass.inline.hpp"
46 #include "oops/objArrayOop.inline.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "oops/typeArrayOop.inline.hpp"
49 #include "prims/jvmtiExport.hpp"
50 #include "prims/unsafe.hpp"
51 #include "runtime/fieldDescriptor.inline.hpp"
52 #include "runtime/globals.hpp"
53 #include "runtime/handles.inline.hpp"
54 #include "runtime/interfaceSupport.inline.hpp"
55 #include "runtime/javaThread.inline.hpp"
56 #include "runtime/jniHandles.inline.hpp"
57 #include "runtime/orderAccess.hpp"
58 #include "runtime/reflection.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/stubRoutines.hpp"
61 #include "runtime/threadSMR.hpp"
62 #include "runtime/vmOperations.hpp"
63 #include "runtime/vm_version.hpp"
64 #include "sanitizers/ub.hpp"
65 #include "services/threadService.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/copy.hpp"
68 #include "utilities/dtrace.hpp"
69 #include "utilities/macros.hpp"
70
71 /**
158 }
159 #endif
160 }
161
162 static inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
163 assert_field_offset_sane(p, field_offset);
164 uintptr_t base_address = cast_from_oop<uintptr_t>(p);
165 uintptr_t byte_offset = (uintptr_t)field_offset_to_byte_offset(field_offset);
166 return (void*)(base_address + byte_offset);
167 }
168
169 // Externally callable versions:
170 // (Use these in compiler intrinsics which emulate unsafe primitives.)
171 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
172 return field_offset;
173 }
174 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
175 return byte_offset;
176 }
177
178 ///// Data read/writes on the Java heap and in native (off-heap) memory
179
180 /**
181 * Helper class to wrap memory accesses in JavaThread::doing_unsafe_access()
182 */
183 class GuardUnsafeAccess {
184 JavaThread* _thread;
185
186 public:
187 GuardUnsafeAccess(JavaThread* thread) : _thread(thread) {
188 // native/off-heap access which may raise SIGBUS if accessing
189 // memory mapped file data in a region of the file which has
190 // been truncated and is now invalid.
191 _thread->set_doing_unsafe_access(true);
192 }
193
194 ~GuardUnsafeAccess() {
195 _thread->set_doing_unsafe_access(false);
196 }
197 };
236 jboolean normalize_for_read(jboolean x) {
237 return x != 0;
238 }
239
240 public:
241 MemoryAccess(JavaThread* thread, jobject obj, jlong offset)
242 : _thread(thread), _obj(JNIHandles::resolve(obj)), _offset((ptrdiff_t)offset) {
243 assert_field_offset_sane(_obj, offset);
244 }
245
246 T get() {
247 GuardUnsafeAccess guard(_thread);
248 return normalize_for_read(*addr());
249 }
250
251 // we use this method at some places for writing to 0 e.g. to cause a crash;
252 // ubsan does not know that this is the desired behavior
253 ATTRIBUTE_NO_UBSAN
254 void put(T x) {
255 GuardUnsafeAccess guard(_thread);
256 assert(_obj == nullptr || !_obj->is_inline_type() || _obj->mark().is_larval_state(), "must be an object instance or a larval inline type");
257 *addr() = normalize_for_write(x);
258 }
259
260 T get_volatile() {
261 GuardUnsafeAccess guard(_thread);
262 volatile T ret = RawAccess<MO_SEQ_CST>::load(addr());
263 return normalize_for_read(ret);
264 }
265
266 void put_volatile(T x) {
267 GuardUnsafeAccess guard(_thread);
268 RawAccess<MO_SEQ_CST>::store(addr(), normalize_for_write(x));
269 }
270 };
271
272 #ifdef ASSERT
273 /*
274 * Get the field descriptor of the field of the given object at the given offset.
275 */
276 static bool get_field_descriptor(oop p, jlong offset, fieldDescriptor* fd) {
277 bool found = false;
278 Klass* k = p->klass();
279 if (k->is_instance_klass()) {
280 InstanceKlass* ik = InstanceKlass::cast(k);
281 found = ik->find_field_from_offset((int)offset, false, fd);
282 if (!found && ik->is_mirror_instance_klass()) {
283 Klass* k2 = java_lang_Class::as_Klass(p);
284 if (k2->is_instance_klass()) {
285 ik = InstanceKlass::cast(k2);
286 found = ik->find_field_from_offset((int)offset, true, fd);
287 }
288 }
289 }
290 return found;
291 }
292 #endif // ASSERT
293
294 static void assert_and_log_unsafe_value_access(oop p, jlong offset, InlineKlass* vk) {
295 Klass* k = p->klass();
296 #ifdef ASSERT
297 if (k->is_instance_klass()) {
298 assert_field_offset_sane(p, offset);
299 fieldDescriptor fd;
300 bool found = get_field_descriptor(p, offset, &fd);
301 if (found) {
302 assert(found, "value field not found");
303 assert(fd.is_flat(), "field not flat");
304 } else {
305 if (log_is_enabled(Trace, valuetypes)) {
306 log_trace(valuetypes)("not a field in %s at offset " UINT64_FORMAT_X,
307 p->klass()->external_name(), (uint64_t)offset);
308 }
309 }
310 } else if (k->is_flatArray_klass()) {
311 FlatArrayKlass* vak = FlatArrayKlass::cast(k);
312 int index = (offset - vak->array_header_in_bytes()) / vak->element_byte_size();
313 address dest = (address)((flatArrayOop)p)->value_at_addr(index, vak->layout_helper());
314 assert(dest == (cast_from_oop<address>(p) + offset), "invalid offset");
315 } else {
316 ShouldNotReachHere();
317 }
318 #endif // ASSERT
319 if (log_is_enabled(Trace, valuetypes)) {
320 if (k->is_flatArray_klass()) {
321 FlatArrayKlass* vak = FlatArrayKlass::cast(k);
322 int index = (offset - vak->array_header_in_bytes()) / vak->element_byte_size();
323 address dest = (address)((flatArrayOop)p)->value_at_addr(index, vak->layout_helper());
324 log_trace(valuetypes)("%s array type %s index %d element size %d offset " UINT64_FORMAT_X " at " INTPTR_FORMAT,
325 p->klass()->external_name(), vak->external_name(),
326 index, vak->element_byte_size(), (uint64_t)offset, p2i(dest));
327 } else {
328 log_trace(valuetypes)("%s field type %s at offset " UINT64_FORMAT_X,
329 p->klass()->external_name(), vk->external_name(), (uint64_t)offset);
330 }
331 }
332 }
333
334 // These functions allow a null base pointer with an arbitrary address.
335 // But if the base pointer is non-null, the offset should make some sense.
336 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
337 UNSAFE_ENTRY(jobject, Unsafe_GetReference(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) {
338 oop p = JNIHandles::resolve(obj);
339 assert_field_offset_sane(p, offset);
340 oop v = HeapAccess<ON_UNKNOWN_OOP_REF>::oop_load_at(p, offset);
341 return JNIHandles::make_local(THREAD, v);
342 } UNSAFE_END
343
344 UNSAFE_ENTRY(void, Unsafe_PutReference(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) {
345 oop x = JNIHandles::resolve(x_h);
346 oop p = JNIHandles::resolve(obj);
347 assert_field_offset_sane(p, offset);
348 assert(!p->is_inline_type() || p->mark().is_larval_state(), "must be an object instance or a larval inline type");
349 HeapAccess<ON_UNKNOWN_OOP_REF>::oop_store_at(p, offset, x);
350 } UNSAFE_END
351
352 UNSAFE_ENTRY(jlong, Unsafe_ValueHeaderSize(JNIEnv *env, jobject unsafe, jclass c)) {
353 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(c));
354 InlineKlass* vk = InlineKlass::cast(k);
355 return vk->payload_offset();
356 } UNSAFE_END
357
358 UNSAFE_ENTRY(jboolean, Unsafe_IsFlatField(JNIEnv *env, jobject unsafe, jobject o)) {
359 oop f = JNIHandles::resolve_non_null(o);
360 Klass* k = java_lang_Class::as_Klass(java_lang_reflect_Field::clazz(f));
361 int slot = java_lang_reflect_Field::slot(f);
362 return InstanceKlass::cast(k)->field_is_flat(slot);
363 } UNSAFE_END
364
365 UNSAFE_ENTRY(jboolean, Unsafe_HasNullMarker(JNIEnv *env, jobject unsafe, jobject o)) {
366 oop f = JNIHandles::resolve_non_null(o);
367 Klass* k = java_lang_Class::as_Klass(java_lang_reflect_Field::clazz(f));
368 int slot = java_lang_reflect_Field::slot(f);
369 return InstanceKlass::cast(k)->field_has_null_marker(slot);
370 } UNSAFE_END
371
372 UNSAFE_ENTRY(jint, Unsafe_NullMarkerOffset(JNIEnv *env, jobject unsafe, jobject o)) {
373 oop f = JNIHandles::resolve_non_null(o);
374 Klass* k = java_lang_Class::as_Klass(java_lang_reflect_Field::clazz(f));
375 int slot = java_lang_reflect_Field::slot(f);
376 return InstanceKlass::cast(k)->null_marker_offset(slot);
377 } UNSAFE_END
378
379 UNSAFE_ENTRY(jint, Unsafe_ArrayLayout(JNIEnv *env, jobject unsafe, jclass c)) {
380 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(c));
381 if (!k->is_flatArray_klass()) {
382 return (jint)LayoutKind::REFERENCE;
383 } else {
384 return (jint)FlatArrayKlass::cast(k)->layout_kind();
385 }
386 } UNSAFE_END
387
388 UNSAFE_ENTRY(jint, Unsafe_FieldLayout(JNIEnv *env, jobject unsafe, jobject field)) {
389 assert(field != nullptr, "field must not be null");
390
391 oop reflected = JNIHandles::resolve_non_null(field);
392 oop mirror = java_lang_reflect_Field::clazz(reflected);
393 Klass* k = java_lang_Class::as_Klass(mirror);
394 int slot = java_lang_reflect_Field::slot(reflected);
395 int modifiers = java_lang_reflect_Field::modifiers(reflected);
396
397 if ((modifiers & JVM_ACC_STATIC) != 0) {
398 return (jint)LayoutKind::REFERENCE; // static fields are never flat
399 } else {
400 InstanceKlass* ik = InstanceKlass::cast(k);
401 if (ik->field_is_flat(slot)) {
402 return (jint)ik->inline_layout_info(slot).kind();
403 } else {
404 return (jint)LayoutKind::REFERENCE;
405 }
406 }
407 } UNSAFE_END
408
409 UNSAFE_ENTRY(jarray, Unsafe_NewSpecialArray(JNIEnv *env, jobject unsafe, jclass elmClass, jint len, jint layoutKind)) {
410 oop mirror = JNIHandles::resolve_non_null(elmClass);
411 Klass* klass = java_lang_Class::as_Klass(mirror);
412 klass->initialize(CHECK_NULL);
413 if (len < 0) {
414 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
415 }
416 if (klass->is_identity_class()) {
417 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
418 }
419 if (klass->is_abstract()) {
420 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract");
421 }
422 LayoutKind lk = static_cast<LayoutKind>(layoutKind);
423 if (lk <= LayoutKind::REFERENCE || lk >= LayoutKind::UNKNOWN) {
424 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Invalid layout kind");
425 }
426 InlineKlass* vk = InlineKlass::cast(klass);
427 // WARNING: test below will need modifications when flat layouts supported for fields
428 // but not for arrays are introduce (NULLABLE_NON_ATOMIC_FLAT for instance)
429 if (!UseArrayFlattening || !vk->is_layout_supported(lk)) {
430 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "Layout not supported");
431 }
432 oop array = oopFactory::new_flatArray(vk, len, lk, CHECK_NULL);
433 return (jarray) JNIHandles::make_local(THREAD, array);
434 } UNSAFE_END
435
436 UNSAFE_ENTRY(jboolean, Unsafe_IsFlatArray(JNIEnv *env, jobject unsafe, jclass c)) {
437 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(c));
438 return k->is_flatArray_klass();
439 } UNSAFE_END
440
441 UNSAFE_ENTRY(jobject, Unsafe_GetValue(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jclass vc)) {
442 oop base = JNIHandles::resolve(obj);
443 if (base == nullptr) {
444 THROW_NULL(vmSymbols::java_lang_NullPointerException());
445 }
446 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(vc));
447 InlineKlass* vk = InlineKlass::cast(k);
448 assert_and_log_unsafe_value_access(base, offset, vk);
449 LayoutKind lk = LayoutKind::UNKNOWN;
450 if (base->is_array()) {
451 FlatArrayKlass* fak = FlatArrayKlass::cast(base->klass());
452 lk = fak->layout_kind();
453 } else {
454 fieldDescriptor fd;
455 InstanceKlass::cast(base->klass())->find_field_from_offset(offset, false, &fd);
456 lk = fd.field_holder()->inline_layout_info(fd.index()).kind();
457 }
458 Handle base_h(THREAD, base);
459 oop v = vk->read_payload_from_addr(base_h(), offset, lk, CHECK_NULL);
460 return JNIHandles::make_local(THREAD, v);
461 } UNSAFE_END
462
463 UNSAFE_ENTRY(jobject, Unsafe_GetFlatValue(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint layoutKind, jclass vc)) {
464 assert(layoutKind != (int)LayoutKind::REFERENCE, "This method handles only flat layouts");
465 oop base = JNIHandles::resolve(obj);
466 if (base == nullptr) {
467 THROW_NULL(vmSymbols::java_lang_NullPointerException());
468 }
469 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(vc));
470 InlineKlass* vk = InlineKlass::cast(k);
471 assert_and_log_unsafe_value_access(base, offset, vk);
472 LayoutKind lk = (LayoutKind)layoutKind;
473 Handle base_h(THREAD, base);
474 oop v = vk->read_payload_from_addr(base_h(), offset, lk, CHECK_NULL);
475 return JNIHandles::make_local(THREAD, v);
476 } UNSAFE_END
477
478 UNSAFE_ENTRY(void, Unsafe_PutValue(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jclass vc, jobject value)) {
479 oop base = JNIHandles::resolve(obj);
480 if (base == nullptr) {
481 THROW(vmSymbols::java_lang_NullPointerException());
482 }
483 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(vc));
484 InlineKlass* vk = InlineKlass::cast(k);
485 assert(!base->is_inline_type() || base->mark().is_larval_state(), "must be an object instance or a larval inline type");
486 assert_and_log_unsafe_value_access(base, offset, vk);
487 LayoutKind lk = LayoutKind::UNKNOWN;
488 if (base->is_array()) {
489 FlatArrayKlass* fak = FlatArrayKlass::cast(base->klass());
490 lk = fak->layout_kind();
491 } else {
492 fieldDescriptor fd;
493 InstanceKlass::cast(base->klass())->find_field_from_offset(offset, false, &fd);
494 lk = fd.field_holder()->inline_layout_info(fd.index()).kind();
495 }
496 oop v = JNIHandles::resolve(value);
497 vk->write_value_to_addr(v, ((char*)(oopDesc*)base) + offset, lk, true, CHECK);
498 } UNSAFE_END
499
500 UNSAFE_ENTRY(void, Unsafe_PutFlatValue(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint layoutKind, jclass vc, jobject value)) {
501 assert(layoutKind != (int)LayoutKind::REFERENCE, "This method handles only flat layouts");
502 oop base = JNIHandles::resolve(obj);
503 if (base == nullptr) {
504 THROW(vmSymbols::java_lang_NullPointerException());
505 }
506 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(vc));
507 InlineKlass* vk = InlineKlass::cast(k);
508 assert(!base->is_inline_type() || base->mark().is_larval_state(), "must be an object instance or a larval inline type");
509 assert_and_log_unsafe_value_access(base, offset, vk);
510 LayoutKind lk = (LayoutKind)layoutKind;
511 oop v = JNIHandles::resolve(value);
512 vk->write_value_to_addr(v, ((char*)(oopDesc*)base) + offset, lk, true, CHECK);
513 } UNSAFE_END
514
515 UNSAFE_ENTRY(jobject, Unsafe_MakePrivateBuffer(JNIEnv *env, jobject unsafe, jobject value)) {
516 oop v = JNIHandles::resolve_non_null(value);
517 assert(v->is_inline_type(), "must be an inline type instance");
518 Handle vh(THREAD, v);
519 InlineKlass* vk = InlineKlass::cast(v->klass());
520 instanceOop new_value = vk->allocate_instance_buffer(CHECK_NULL);
521 vk->copy_payload_to_addr(vk->payload_addr(vh()), vk->payload_addr(new_value), LayoutKind::BUFFERED, false);
522 markWord mark = new_value->mark();
523 new_value->set_mark(mark.enter_larval_state());
524 return JNIHandles::make_local(THREAD, new_value);
525 } UNSAFE_END
526
527 UNSAFE_ENTRY(jobject, Unsafe_FinishPrivateBuffer(JNIEnv *env, jobject unsafe, jobject value)) {
528 oop v = JNIHandles::resolve(value);
529 assert(v->mark().is_larval_state(), "must be a larval value");
530 markWord mark = v->mark();
531 v->set_mark(mark.exit_larval_state());
532 return JNIHandles::make_local(THREAD, v);
533 } UNSAFE_END
534
535 UNSAFE_ENTRY(jobject, Unsafe_GetReferenceVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) {
536 oop p = JNIHandles::resolve(obj);
537 assert_field_offset_sane(p, offset);
538 oop v = HeapAccess<MO_SEQ_CST | ON_UNKNOWN_OOP_REF>::oop_load_at(p, offset);
539 return JNIHandles::make_local(THREAD, v);
540 } UNSAFE_END
541
542 UNSAFE_ENTRY(void, Unsafe_PutReferenceVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) {
543 oop x = JNIHandles::resolve(x_h);
544 oop p = JNIHandles::resolve(obj);
545 assert_field_offset_sane(p, offset);
546 HeapAccess<MO_SEQ_CST | ON_UNKNOWN_OOP_REF>::oop_store_at(p, offset, x);
547 } UNSAFE_END
548
549 UNSAFE_ENTRY(jobject, Unsafe_GetUncompressedObject(JNIEnv *env, jobject unsafe, jlong addr)) {
550 oop v = *(oop*) (address) addr;
551 return JNIHandles::make_local(THREAD, v);
552 } UNSAFE_END
553
554 #define DEFINE_GETSETOOP(java_type, Type) \
835 return false;
836 }
837 UNSAFE_END
838
839 static void getBaseAndScale(int& base, int& scale, jclass clazz, TRAPS) {
840 assert(clazz != nullptr, "clazz must not be null");
841
842 oop mirror = JNIHandles::resolve_non_null(clazz);
843 Klass* k = java_lang_Class::as_Klass(mirror);
844
845 if (k == nullptr || !k->is_array_klass()) {
846 THROW(vmSymbols::java_lang_InvalidClassException());
847 } else if (k->is_objArray_klass()) {
848 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
849 scale = heapOopSize;
850 } else if (k->is_typeArray_klass()) {
851 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
852 base = tak->array_header_in_bytes();
853 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
854 scale = (1 << tak->log2_element_size());
855 } else if (k->is_flatArray_klass()) {
856 FlatArrayKlass* vak = FlatArrayKlass::cast(k);
857 InlineKlass* vklass = vak->element_klass();
858 base = vak->array_header_in_bytes();
859 scale = vak->element_byte_size();
860 } else {
861 ShouldNotReachHere();
862 }
863 }
864
865 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset0(JNIEnv *env, jobject unsafe, jclass clazz)) {
866 int base = 0, scale = 0;
867 getBaseAndScale(base, scale, clazz, CHECK_0);
868
869 return field_offset_from_byte_offset(base);
870 } UNSAFE_END
871
872
873 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale0(JNIEnv *env, jobject unsafe, jclass clazz)) {
874 int base = 0, scale = 0;
875 getBaseAndScale(base, scale, clazz, CHECK_0);
876
877 // This VM packs both fields and array elements down to the byte.
878 // But watch out: If this changes, so that array references for
879 // a given primitive type (say, T_BOOLEAN) use different memory units
880 // than fields, this method MUST return zero for such arrays.
881 // For example, the VM used to store sub-word sized fields in full
882 // words in the object layout, so that accessors like getByte(Object,int)
883 // did not really do what one might expect for arrays. Therefore,
884 // this function used to report a zero scale factor, so that the user
885 // would know not to attempt to access sub-word array elements.
886 // // Code for unpacked fields:
887 // if (scale < wordSize) return 0;
888
889 // The following allows for a pretty general fieldOffset cookie scheme,
890 // but requires it to be linear in byte offset.
891 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
892 } UNSAFE_END
893
894
895 UNSAFE_ENTRY(jlong, Unsafe_GetObjectSize0(JNIEnv* env, jobject o, jobject obj))
896 oop p = JNIHandles::resolve(obj);
897 return p->size() * HeapWordSize;
898 UNSAFE_END
899
900
901 static inline void throw_new(JNIEnv *env, const char *ename) {
902 jclass cls = env->FindClass(ename);
903 if (env->ExceptionCheck()) {
904 env->ExceptionClear();
905 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", ename);
906 return;
907 }
908
909 env->ThrowNew(cls, nullptr);
910 }
911
912 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
913 // Code lifted from JDK 1.3 ClassLoader.c
914
915 jbyte *body;
916 char *utfName = nullptr;
917 jclass result = nullptr;
918 char buf[128];
919
920 assert(data != nullptr, "Class bytes must not be null");
1100
1101
1102 /// JVM_RegisterUnsafeMethods
1103
1104 #define ADR "J"
1105
1106 #define LANG "Ljava/lang/"
1107
1108 #define OBJ LANG "Object;"
1109 #define CLS LANG "Class;"
1110 #define FLD LANG "reflect/Field;"
1111 #define THR LANG "Throwable;"
1112
1113 #define DC_Args LANG "String;[BII" LANG "ClassLoader;" "Ljava/security/ProtectionDomain;"
1114 #define DAC_Args CLS "[B[" OBJ
1115
1116 #define CC (char*) /*cast a literal from (const char*)*/
1117 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1118
1119 #define DECLARE_GETPUTOOP(Type, Desc) \
1120 {CC "get" #Type, CC "(" OBJ "J)" #Desc, FN_PTR(Unsafe_Get##Type)}, \
1121 {CC "put" #Type, CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Put##Type)}, \
1122 {CC "get" #Type "Volatile", CC "(" OBJ "J)" #Desc, FN_PTR(Unsafe_Get##Type##Volatile)}, \
1123 {CC "put" #Type "Volatile", CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Put##Type##Volatile)}
1124
1125
1126 static JNINativeMethod jdk_internal_misc_Unsafe_methods[] = {
1127 {CC "getReference", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetReference)},
1128 {CC "putReference", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_PutReference)},
1129 {CC "getReferenceVolatile", CC "(" OBJ "J)" OBJ, FN_PTR(Unsafe_GetReferenceVolatile)},
1130 {CC "putReferenceVolatile", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_PutReferenceVolatile)},
1131
1132 {CC "isFlatArray", CC "(" CLS ")Z", FN_PTR(Unsafe_IsFlatArray)},
1133 {CC "isFlatField0", CC "(" OBJ ")Z", FN_PTR(Unsafe_IsFlatField)},
1134 {CC "hasNullMarker0", CC "(" OBJ ")Z", FN_PTR(Unsafe_HasNullMarker)},
1135 {CC "nullMarkerOffset0", CC "(" OBJ ")I", FN_PTR(Unsafe_NullMarkerOffset)},
1136 {CC "arrayLayout0", CC "(" OBJ ")I", FN_PTR(Unsafe_ArrayLayout)},
1137 {CC "fieldLayout0", CC "(" OBJ ")I", FN_PTR(Unsafe_FieldLayout)},
1138 {CC "newSpecialArray", CC "(" CLS "II)[" OBJ, FN_PTR(Unsafe_NewSpecialArray)},
1139 {CC "getValue", CC "(" OBJ "J" CLS ")" OBJ, FN_PTR(Unsafe_GetValue)},
1140 {CC "getFlatValue", CC "(" OBJ "JI" CLS ")" OBJ, FN_PTR(Unsafe_GetFlatValue)},
1141 {CC "putValue", CC "(" OBJ "J" CLS OBJ ")V", FN_PTR(Unsafe_PutValue)},
1142 {CC "putFlatValue", CC "(" OBJ "JI" CLS OBJ ")V", FN_PTR(Unsafe_PutFlatValue)},
1143 {CC "makePrivateBuffer", CC "(" OBJ ")" OBJ, FN_PTR(Unsafe_MakePrivateBuffer)},
1144 {CC "finishPrivateBuffer", CC "(" OBJ ")" OBJ, FN_PTR(Unsafe_FinishPrivateBuffer)},
1145 {CC "valueHeaderSize", CC "(" CLS ")J", FN_PTR(Unsafe_ValueHeaderSize)},
1146
1147 {CC "getUncompressedObject", CC "(" ADR ")" OBJ, FN_PTR(Unsafe_GetUncompressedObject)},
1148
1149 DECLARE_GETPUTOOP(Boolean, Z),
1150 DECLARE_GETPUTOOP(Byte, B),
1151 DECLARE_GETPUTOOP(Short, S),
1152 DECLARE_GETPUTOOP(Char, C),
1153 DECLARE_GETPUTOOP(Int, I),
1154 DECLARE_GETPUTOOP(Long, J),
1155 DECLARE_GETPUTOOP(Float, F),
1156 DECLARE_GETPUTOOP(Double, D),
1157
1158 {CC "allocateMemory0", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory0)},
1159 {CC "reallocateMemory0", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory0)},
1160 {CC "freeMemory0", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory0)},
1161
1162 {CC "objectFieldOffset0", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset0)},
1163 {CC "objectFieldOffset1", CC "(" CLS LANG "String;)J", FN_PTR(Unsafe_ObjectFieldOffset1)},
1164 {CC "staticFieldOffset0", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset0)},
1165 {CC "staticFieldBase0", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBase0)},
1166 {CC "ensureClassInitialized0", CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized0)},
1167 {CC "arrayBaseOffset0", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset0)},
1168 {CC "arrayIndexScale0", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale0)},
1169 {CC "getObjectSize0", CC "(Ljava/lang/Object;)J", FN_PTR(Unsafe_GetObjectSize0)},
1170
1171 {CC "defineClass0", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)},
1172 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1173 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)},
1174 {CC "compareAndSetReference",CC "(" OBJ "J" OBJ "" OBJ ")Z", FN_PTR(Unsafe_CompareAndSetReference)},
1175 {CC "compareAndSetInt", CC "(" OBJ "J""I""I"")Z", FN_PTR(Unsafe_CompareAndSetInt)},
1176 {CC "compareAndSetLong", CC "(" OBJ "J""J""J"")Z", FN_PTR(Unsafe_CompareAndSetLong)},
1177 {CC "compareAndExchangeReference", CC "(" OBJ "J" OBJ "" OBJ ")" OBJ, FN_PTR(Unsafe_CompareAndExchangeReference)},
1178 {CC "compareAndExchangeInt", CC "(" OBJ "J""I""I"")I", FN_PTR(Unsafe_CompareAndExchangeInt)},
1179 {CC "compareAndExchangeLong", CC "(" OBJ "J""J""J"")J", FN_PTR(Unsafe_CompareAndExchangeLong)},
1180
1181 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)},
1182 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)},
1183
1184 {CC "getLoadAverage0", CC "([DI)I", FN_PTR(Unsafe_GetLoadAverage0)},
1185
1186 {CC "copyMemory0", CC "(" OBJ "J" OBJ "JJ)V", FN_PTR(Unsafe_CopyMemory0)},
1187 {CC "copySwapMemory0", CC "(" OBJ "J" OBJ "JJJ)V", FN_PTR(Unsafe_CopySwapMemory0)},
1188 {CC "writeback0", CC "(" "J" ")V", FN_PTR(Unsafe_WriteBack0)},
1189 {CC "writebackPreSync0", CC "()V", FN_PTR(Unsafe_WriteBackPreSync0)},
|