1 /*
2 * Copyright (c) 2000, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
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/vm_version.hpp"
56 #include "runtime/vmOperations.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) \
573 InstanceKlass* k = InstanceKlass::cast(klass);
574 k->initialize(CHECK);
575 }
576 }
577 UNSAFE_END
578
579 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized0(JNIEnv *env, jobject unsafe, jobject clazz)) {
580 assert(clazz != nullptr, "clazz must not be null");
581
582 oop mirror = JNIHandles::resolve_non_null(clazz);
583 Klass* klass = java_lang_Class::as_Klass(mirror);
584
585 if (klass != nullptr && klass->should_be_initialized()) {
586 return true;
587 }
588
589 return false;
590 }
591 UNSAFE_END
592
593 static void getBaseAndScale(int& base, int& scale, jclass clazz, TRAPS) {
594 assert(clazz != nullptr, "clazz must not be null");
595
596 oop mirror = JNIHandles::resolve_non_null(clazz);
597 Klass* k = java_lang_Class::as_Klass(mirror);
598
599 if (k == nullptr || !k->is_array_klass()) {
600 THROW(vmSymbols::java_lang_InvalidClassException());
601 } else if (k->is_objArray_klass()) {
602 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
603 scale = heapOopSize;
604 } else if (k->is_typeArray_klass()) {
605 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
606 base = tak->array_header_in_bytes();
607 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
608 scale = (1 << tak->log2_element_size());
609 } else {
610 ShouldNotReachHere();
611 }
612 }
613
614 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset0(JNIEnv *env, jobject unsafe, jclass clazz)) {
615 int base = 0, scale = 0;
616 getBaseAndScale(base, scale, clazz, CHECK_0);
617
618 return field_offset_from_byte_offset(base);
619 } UNSAFE_END
620
621
622 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale0(JNIEnv *env, jobject unsafe, jclass clazz)) {
623 int base = 0, scale = 0;
624 getBaseAndScale(base, scale, clazz, CHECK_0);
625
626 // This VM packs both fields and array elements down to the byte.
627 // But watch out: If this changes, so that array references for
628 // a given primitive type (say, T_BOOLEAN) use different memory units
629 // than fields, this method MUST return zero for such arrays.
630 // For example, the VM used to store sub-word sized fields in full
631 // words in the object layout, so that accessors like getByte(Object,int)
632 // did not really do what one might expect for arrays. Therefore,
633 // this function used to report a zero scale factor, so that the user
634 // would know not to attempt to access sub-word array elements.
635 // // Code for unpacked fields:
636 // if (scale < wordSize) return 0;
637
638 // The following allows for a pretty general fieldOffset cookie scheme,
639 // but requires it to be linear in byte offset.
640 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
641 } UNSAFE_END
642
643
644 static inline void throw_new(JNIEnv *env, const char *ename) {
645 jclass cls = env->FindClass(ename);
646 if (env->ExceptionCheck()) {
647 env->ExceptionClear();
648 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", ename);
649 return;
650 }
651
652 env->ThrowNew(cls, nullptr);
653 }
654
655 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
656 // Code lifted from JDK 1.3 ClassLoader.c
657
658 jbyte *body;
659 char *utfName = nullptr;
660 jclass result = nullptr;
661 char buf[128];
662
836 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
837 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
838 case 1: a->double_at_put(0, (jdouble)la[0]); break;
839 }
840
841 return ret;
842 } UNSAFE_END
843
844
845 /// JVM_RegisterUnsafeMethods
846
847 #define ADR "J"
848
849 #define LANG "Ljava/lang/"
850
851 #define OBJ LANG "Object;"
852 #define CLS LANG "Class;"
853 #define FLD LANG "reflect/Field;"
854 #define THR LANG "Throwable;"
855
856 #define DC_Args LANG "String;[BII" LANG "ClassLoader;" "Ljava/security/ProtectionDomain;"
857 #define DAC_Args CLS "[B[" OBJ
858
859 #define CC (char*) /*cast a literal from (const char*)*/
860 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
861
862 #define DECLARE_GETPUTOOP(Type, Desc) \
863 {CC "get" #Type, CC "(" OBJ "J)" #Desc, FN_PTR(Unsafe_Get##Type)}, \
864 {CC "put" #Type, CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Put##Type)}, \
865 {CC "get" #Type "Volatile", CC "(" OBJ "J)" #Desc, FN_PTR(Unsafe_Get##Type##Volatile)}, \
866 {CC "put" #Type "Volatile", CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Put##Type##Volatile)}
867
868
869 static JNINativeMethod jdk_internal_misc_Unsafe_methods[] = {
870 {CC "getReference", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetReference)},
871 {CC "putReference", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_PutReference)},
872 {CC "getReferenceVolatile", CC "(" OBJ "J)" OBJ, FN_PTR(Unsafe_GetReferenceVolatile)},
873 {CC "putReferenceVolatile", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_PutReferenceVolatile)},
874
875 {CC "getUncompressedObject", CC "(" ADR ")" OBJ, FN_PTR(Unsafe_GetUncompressedObject)},
876
877 DECLARE_GETPUTOOP(Boolean, Z),
878 DECLARE_GETPUTOOP(Byte, B),
879 DECLARE_GETPUTOOP(Short, S),
880 DECLARE_GETPUTOOP(Char, C),
881 DECLARE_GETPUTOOP(Int, I),
882 DECLARE_GETPUTOOP(Long, J),
883 DECLARE_GETPUTOOP(Float, F),
884 DECLARE_GETPUTOOP(Double, D),
885
886 {CC "allocateMemory0", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory0)},
887 {CC "reallocateMemory0", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory0)},
888 {CC "freeMemory0", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory0)},
889
890 {CC "objectFieldOffset0", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset0)},
891 {CC "knownObjectFieldOffset0", CC "(" CLS LANG "String;)J", FN_PTR(Unsafe_KnownObjectFieldOffset0)},
892 {CC "staticFieldOffset0", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset0)},
893 {CC "staticFieldBase0", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBase0)},
894 {CC "ensureClassInitialized0", CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized0)},
895 {CC "arrayBaseOffset0", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset0)},
896 {CC "arrayIndexScale0", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale0)},
897
898 {CC "defineClass0", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)},
899 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
900 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)},
901 {CC "compareAndSetReference",CC "(" OBJ "J" OBJ "" OBJ ")Z", FN_PTR(Unsafe_CompareAndSetReference)},
902 {CC "compareAndSetInt", CC "(" OBJ "J""I""I"")Z", FN_PTR(Unsafe_CompareAndSetInt)},
903 {CC "compareAndSetLong", CC "(" OBJ "J""J""J"")Z", FN_PTR(Unsafe_CompareAndSetLong)},
904 {CC "compareAndExchangeReference", CC "(" OBJ "J" OBJ "" OBJ ")" OBJ, FN_PTR(Unsafe_CompareAndExchangeReference)},
905 {CC "compareAndExchangeInt", CC "(" OBJ "J""I""I"")I", FN_PTR(Unsafe_CompareAndExchangeInt)},
906 {CC "compareAndExchangeLong", CC "(" OBJ "J""J""J"")J", FN_PTR(Unsafe_CompareAndExchangeLong)},
907
908 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)},
909 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)},
910
911 {CC "getLoadAverage0", CC "([DI)I", FN_PTR(Unsafe_GetLoadAverage0)},
912
913 {CC "copyMemory0", CC "(" OBJ "J" OBJ "JJ)V", FN_PTR(Unsafe_CopyMemory0)},
914 {CC "copySwapMemory0", CC "(" OBJ "J" OBJ "JJJ)V", FN_PTR(Unsafe_CopySwapMemory0)},
915 {CC "writeback0", CC "(" "J" ")V", FN_PTR(Unsafe_WriteBack0)},
916 {CC "writebackPreSync0", CC "()V", FN_PTR(Unsafe_WriteBackPreSync0)},
917 {CC "writebackPostSync0", CC "()V", FN_PTR(Unsafe_WriteBackPostSync0)},
918 {CC "setMemory0", CC "(" OBJ "JJB)V", FN_PTR(Unsafe_SetMemory0)},
919
920 {CC "shouldBeInitialized0", CC "(" CLS ")Z", FN_PTR(Unsafe_ShouldBeInitialized0)},
921
922 {CC "fullFence", CC "()V", FN_PTR(Unsafe_FullFence)},
923 };
924
925 #undef CC
926 #undef FN_PTR
927
928 #undef ADR
929 #undef LANG
930 #undef OBJ
931 #undef CLS
932 #undef FLD
933 #undef THR
934 #undef DC_Args
935 #undef DAC_Args
936
937 #undef DECLARE_GETPUTOOP
938
939
940 // This function is exported, used by NativeLookup.
|
1 /*
2 * Copyright (c) 2000, 2026, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
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 "logging/log.hpp"
35 #include "logging/logStream.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/oopFactory.hpp"
38 #include "memory/resourceArea.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 "oops/valuePayload.hpp"
50 #include "prims/jvmtiExport.hpp"
51 #include "prims/unsafe.hpp"
52 #include "runtime/fieldDescriptor.inline.hpp"
53 #include "runtime/globals.hpp"
54 #include "runtime/handles.inline.hpp"
55 #include "runtime/interfaceSupport.inline.hpp"
56 #include "runtime/javaThread.inline.hpp"
57 #include "runtime/jniHandles.inline.hpp"
58 #include "runtime/orderAccess.hpp"
59 #include "runtime/reflection.hpp"
60 #include "runtime/sharedRuntime.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/threadSMR.hpp"
63 #include "runtime/vm_version.hpp"
64 #include "runtime/vmOperations.hpp"
65 #include "sanitizers/ub.hpp"
66 #include "services/threadService.hpp"
67 #include "utilities/align.hpp"
68 #include "utilities/copy.hpp"
69 #include "utilities/dtrace.hpp"
70 #include "utilities/macros.hpp"
71
72 /**
159 }
160 #endif
161 }
162
163 static inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
164 assert_field_offset_sane(p, field_offset);
165 uintptr_t base_address = cast_from_oop<uintptr_t>(p);
166 uintptr_t byte_offset = (uintptr_t)field_offset_to_byte_offset(field_offset);
167 return (void*)(base_address + byte_offset);
168 }
169
170 // Externally callable versions:
171 // (Use these in compiler intrinsics which emulate unsafe primitives.)
172 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
173 return field_offset;
174 }
175 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
176 return byte_offset;
177 }
178
179 ///// Data read/writes on the Java heap and in native (off-heap) memory
180
181 /**
182 * Helper class to wrap memory accesses in JavaThread::doing_unsafe_access()
183 */
184 class GuardUnsafeAccess {
185 JavaThread* _thread;
186
187 public:
188 GuardUnsafeAccess(JavaThread* thread) : _thread(thread) {
189 // native/off-heap access which may raise SIGBUS if accessing
190 // memory mapped file data in a region of the file which has
191 // been truncated and is now invalid.
192 _thread->set_doing_unsafe_access(true);
193 }
194
195 ~GuardUnsafeAccess() {
196 _thread->set_doing_unsafe_access(false);
197 }
198 };
237 jboolean normalize_for_read(jboolean x) {
238 return x != 0;
239 }
240
241 public:
242 MemoryAccess(JavaThread* thread, jobject obj, jlong offset)
243 : _thread(thread), _obj(JNIHandles::resolve(obj)), _offset((ptrdiff_t)offset) {
244 assert_field_offset_sane(_obj, offset);
245 }
246
247 T get() {
248 GuardUnsafeAccess guard(_thread);
249 return normalize_for_read(*addr());
250 }
251
252 // we use this method at some places for writing to 0 e.g. to cause a crash;
253 // ubsan does not know that this is the desired behavior
254 ATTRIBUTE_NO_UBSAN
255 void put(T x) {
256 GuardUnsafeAccess guard(_thread);
257 assert(_obj == nullptr || !_obj->is_inline_type() || _obj->mark().is_larval_state(), "must be an object instance or a larval inline type");
258 *addr() = normalize_for_write(x);
259 }
260
261 T get_volatile() {
262 GuardUnsafeAccess guard(_thread);
263 volatile T ret = RawAccess<MO_SEQ_CST>::load(addr());
264 return normalize_for_read(ret);
265 }
266
267 void put_volatile(T x) {
268 GuardUnsafeAccess guard(_thread);
269 RawAccess<MO_SEQ_CST>::store(addr(), normalize_for_write(x));
270 }
271 };
272
273 #ifdef ASSERT
274 /*
275 * Get the field descriptor of the field of the given object at the given offset.
276 */
277 static bool get_field_descriptor(oop p, jlong offset, fieldDescriptor* fd) {
278 bool found = false;
279 Klass* k = p->klass();
280 if (k->is_instance_klass()) {
281 InstanceKlass* ik = InstanceKlass::cast(k);
282 found = ik->find_field_from_offset((int)offset, false, fd);
283 if (!found && ik->is_mirror_instance_klass()) {
284 Klass* k2 = java_lang_Class::as_Klass(p);
285 if (k2->is_instance_klass()) {
286 ik = InstanceKlass::cast(k2);
287 found = ik->find_field_from_offset((int)offset, true, fd);
288 }
289 }
290 }
291 return found;
292 }
293 #endif // ASSERT
294
295 static void assert_and_log_unsafe_value_access(oop p, jlong offset, InlineKlass* vk) {
296 Klass* k = p->klass();
297 #ifdef ASSERT
298 if (k->is_instance_klass()) {
299 assert_field_offset_sane(p, offset);
300 fieldDescriptor fd;
301 bool found = get_field_descriptor(p, offset, &fd);
302 if (found) {
303 assert(found, "value field not found");
304 assert(fd.is_flat(), "field not flat");
305 } else {
306 if (log_is_enabled(Trace, valuetypes)) {
307 log_trace(valuetypes)("not a field in %s at offset " UINT64_FORMAT_X,
308 p->klass()->external_name(), (uint64_t)offset);
309 }
310 }
311 } else if (k->is_flatArray_klass()) {
312 FlatArrayKlass* vak = FlatArrayKlass::cast(k);
313 int index = (offset - vak->array_header_in_bytes()) / vak->element_byte_size();
314 address dest = (address)((flatArrayOop)p)->value_at_addr(index, vak->layout_helper());
315 assert(dest == (cast_from_oop<address>(p) + offset), "invalid offset");
316 } else {
317 ShouldNotReachHere();
318 }
319 #endif // ASSERT
320 if (log_is_enabled(Trace, valuetypes)) {
321 if (k->is_flatArray_klass()) {
322 FlatArrayKlass* vak = FlatArrayKlass::cast(k);
323 int index = (offset - vak->array_header_in_bytes()) / vak->element_byte_size();
324 address dest = (address)((flatArrayOop)p)->value_at_addr(index, vak->layout_helper());
325 log_trace(valuetypes)("%s array type %s index %d element size %d offset " UINT64_FORMAT_X " at " INTPTR_FORMAT,
326 p->klass()->external_name(), vak->external_name(),
327 index, vak->element_byte_size(), (uint64_t)offset, p2i(dest));
328 } else {
329 log_trace(valuetypes)("%s field type %s at offset " UINT64_FORMAT_X,
330 p->klass()->external_name(), vk->external_name(), (uint64_t)offset);
331 }
332 }
333 }
334
335 // These functions allow a null base pointer with an arbitrary address.
336 // But if the base pointer is non-null, the offset should make some sense.
337 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
338 UNSAFE_ENTRY(jobject, Unsafe_GetReference(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) {
339 oop p = JNIHandles::resolve(obj);
340 assert_field_offset_sane(p, offset);
341 oop v = HeapAccess<ON_UNKNOWN_OOP_REF>::oop_load_at(p, offset);
342 return JNIHandles::make_local(THREAD, v);
343 } UNSAFE_END
344
345 UNSAFE_ENTRY(void, Unsafe_PutReference(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) {
346 oop x = JNIHandles::resolve(x_h);
347 oop p = JNIHandles::resolve(obj);
348 assert_field_offset_sane(p, offset);
349 assert(!p->is_inline_type() || p->mark().is_larval_state(), "must be an object instance or a larval inline type");
350 HeapAccess<ON_UNKNOWN_OOP_REF>::oop_store_at(p, offset, x);
351 } UNSAFE_END
352
353 UNSAFE_ENTRY(jlong, Unsafe_ValueHeaderSize(JNIEnv *env, jobject unsafe, jclass c)) {
354 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(c));
355 InlineKlass* vk = InlineKlass::cast(k);
356 return vk->payload_offset();
357 } UNSAFE_END
358
359 UNSAFE_ENTRY(jboolean, Unsafe_IsFlatField(JNIEnv *env, jobject unsafe, jobject o)) {
360 oop f = JNIHandles::resolve_non_null(o);
361 Klass* k = java_lang_Class::as_Klass(java_lang_reflect_Field::clazz(f));
362 int slot = java_lang_reflect_Field::slot(f);
363 return InstanceKlass::cast(k)->field_is_flat(slot);
364 } UNSAFE_END
365
366 UNSAFE_ENTRY(jboolean, Unsafe_HasNullMarker(JNIEnv *env, jobject unsafe, jobject o)) {
367 oop f = JNIHandles::resolve_non_null(o);
368 Klass* k = java_lang_Class::as_Klass(java_lang_reflect_Field::clazz(f));
369 int slot = java_lang_reflect_Field::slot(f);
370 return InstanceKlass::cast(k)->field_has_null_marker(slot);
371 } UNSAFE_END
372
373 UNSAFE_ENTRY(jint, Unsafe_NullMarkerOffset(JNIEnv *env, jobject unsafe, jobject o)) {
374 oop f = JNIHandles::resolve_non_null(o);
375 Klass* k = java_lang_Class::as_Klass(java_lang_reflect_Field::clazz(f));
376 int slot = java_lang_reflect_Field::slot(f);
377 return InstanceKlass::cast(k)->field_null_marker_offset(slot);
378 } UNSAFE_END
379
380 UNSAFE_ENTRY(jint, Unsafe_ArrayLayout(JNIEnv *env, jobject unsafe, jarray array)) {
381 oop ar = JNIHandles::resolve_non_null(array);
382 ArrayKlass* ak = ArrayKlass::cast(ar->klass());
383 if (ak->is_refArray_klass()) {
384 return (jint)LayoutKind::REFERENCE;
385 } else if (ak->is_flatArray_klass()) {
386 return (jint)FlatArrayKlass::cast(ak)->layout_kind();
387 } else {
388 ShouldNotReachHere();
389 return -1;
390 }
391 } UNSAFE_END
392
393 UNSAFE_ENTRY(jint, Unsafe_FieldLayout(JNIEnv *env, jobject unsafe, jobject field)) {
394 assert(field != nullptr, "field must not be null");
395
396 oop reflected = JNIHandles::resolve_non_null(field);
397 oop mirror = java_lang_reflect_Field::clazz(reflected);
398 Klass* k = java_lang_Class::as_Klass(mirror);
399 int slot = java_lang_reflect_Field::slot(reflected);
400 int modifiers = java_lang_reflect_Field::modifiers(reflected);
401
402 if ((modifiers & JVM_ACC_STATIC) != 0) {
403 return (jint)LayoutKind::REFERENCE; // static fields are never flat
404 } else {
405 InstanceKlass* ik = InstanceKlass::cast(k);
406 if (ik->field_is_flat(slot)) {
407 return (jint)ik->inline_layout_info(slot).kind();
408 } else {
409 return (jint)LayoutKind::REFERENCE;
410 }
411 }
412 } UNSAFE_END
413
414 UNSAFE_ENTRY(jarray, Unsafe_NewSpecialArray(JNIEnv *env, jobject unsafe, jclass elmClass, jint len, jint layoutKind)) {
415 oop mirror = JNIHandles::resolve_non_null(elmClass);
416 Klass* klass = java_lang_Class::as_Klass(mirror);
417 klass->initialize(CHECK_NULL);
418 if (len < 0) {
419 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
420 }
421 if (klass->is_array_klass() || klass->is_identity_class()) {
422 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
423 }
424 if (klass->is_abstract()) {
425 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract");
426 }
427 LayoutKind lk = static_cast<LayoutKind>(layoutKind);
428 if (lk <= LayoutKind::REFERENCE || lk == LayoutKind::NULLABLE_NON_ATOMIC_FLAT || lk >= LayoutKind::UNKNOWN) {
429 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Invalid layout kind");
430 }
431 InlineKlass* vk = InlineKlass::cast(klass);
432 // WARNING: test below will need modifications when flat layouts supported for fields
433 // but not for arrays are introduce (NULLABLE_NON_ATOMIC_FLAT for instance)
434 if (!UseArrayFlattening || !vk->is_layout_supported(lk)) {
435 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "Layout not supported");
436 }
437 ArrayProperties props = ArrayKlass::array_properties_from_layout(lk);
438 oop array = oopFactory::new_flatArray(vk, len, props, lk, CHECK_NULL);
439 return (jarray) JNIHandles::make_local(THREAD, array);
440 } UNSAFE_END
441
442 UNSAFE_ENTRY(jobject, Unsafe_GetFlatValue(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint layoutKind, jclass vc)) {
443 assert(layoutKind != (int)LayoutKind::UNKNOWN, "Sanity");
444 assert(layoutKind != (int)LayoutKind::REFERENCE, "This method handles only flat layouts");
445 oop base = JNIHandles::resolve(obj);
446 if (base == nullptr) {
447 THROW_NULL(vmSymbols::java_lang_NullPointerException());
448 }
449 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(vc));
450 InlineKlass* vk = InlineKlass::cast(k);
451 assert_and_log_unsafe_value_access(base, offset, vk);
452 LayoutKind lk = (LayoutKind)layoutKind;
453 FlatValuePayload payload = FlatValuePayload::construct_from_parts(base, offset, vk, lk);
454 oop v = payload.read(CHECK_NULL);
455 return JNIHandles::make_local(THREAD, v);
456 } UNSAFE_END
457
458 UNSAFE_ENTRY(void, Unsafe_PutFlatValue(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint layoutKind, jclass vc, jobject value)) {
459 assert(layoutKind != (int)LayoutKind::UNKNOWN, "Sanity");
460 assert(layoutKind != (int)LayoutKind::REFERENCE, "This method handles only flat layouts");
461 oop base = JNIHandles::resolve(obj);
462 if (base == nullptr) {
463 THROW(vmSymbols::java_lang_NullPointerException());
464 }
465
466 InlineKlass* vk = InlineKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(vc)));
467 assert_and_log_unsafe_value_access(base, offset, vk);
468 LayoutKind lk = (LayoutKind)layoutKind;
469 FlatValuePayload payload = FlatValuePayload::construct_from_parts(base, offset, vk, lk);
470 payload.write(inlineOop(JNIHandles::resolve(value)), CHECK);
471 } UNSAFE_END
472
473 UNSAFE_ENTRY(jobject, Unsafe_GetReferenceVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) {
474 oop p = JNIHandles::resolve(obj);
475 assert_field_offset_sane(p, offset);
476 oop v = HeapAccess<MO_SEQ_CST | ON_UNKNOWN_OOP_REF>::oop_load_at(p, offset);
477 return JNIHandles::make_local(THREAD, v);
478 } UNSAFE_END
479
480 UNSAFE_ENTRY(void, Unsafe_PutReferenceVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) {
481 oop x = JNIHandles::resolve(x_h);
482 oop p = JNIHandles::resolve(obj);
483 assert_field_offset_sane(p, offset);
484 HeapAccess<MO_SEQ_CST | ON_UNKNOWN_OOP_REF>::oop_store_at(p, offset, x);
485 } UNSAFE_END
486
487 UNSAFE_ENTRY(jobject, Unsafe_GetUncompressedObject(JNIEnv *env, jobject unsafe, jlong addr)) {
488 oop v = *(oop*) (address) addr;
489 return JNIHandles::make_local(THREAD, v);
490 } UNSAFE_END
491
492 #define DEFINE_GETSETOOP(java_type, Type) \
763 InstanceKlass* k = InstanceKlass::cast(klass);
764 k->initialize(CHECK);
765 }
766 }
767 UNSAFE_END
768
769 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized0(JNIEnv *env, jobject unsafe, jobject clazz)) {
770 assert(clazz != nullptr, "clazz must not be null");
771
772 oop mirror = JNIHandles::resolve_non_null(clazz);
773 Klass* klass = java_lang_Class::as_Klass(mirror);
774
775 if (klass != nullptr && klass->should_be_initialized()) {
776 return true;
777 }
778
779 return false;
780 }
781 UNSAFE_END
782
783 UNSAFE_ENTRY(void, Unsafe_NotifyStrictStaticAccess0(JNIEnv *env, jobject unsafe, jobject clazz,
784 jlong sfoffset, jboolean writing)) {
785 assert(clazz != nullptr, "clazz must not be null");
786
787 oop mirror = JNIHandles::resolve_non_null(clazz);
788 Klass* klass = java_lang_Class::as_Klass(mirror);
789
790 if (klass != nullptr && klass->is_instance_klass()) {
791 InstanceKlass* ik = InstanceKlass::cast(klass);
792 fieldDescriptor fd;
793 if (ik->find_local_field_from_offset((int)sfoffset, true, &fd)) {
794 // Note: The Unsafe API takes an OFFSET, but the InstanceKlass wants the INDEX.
795 // We could surface field indexes into Unsafe, but that's too much churn.
796 ik->notify_strict_static_access(fd.index(), writing, CHECK);
797 return;
798 }
799 }
800 THROW(vmSymbols::java_lang_InternalError());
801 }
802 UNSAFE_END
803
804 static void getBaseAndScale(int& base, int& scale, jclass clazz, TRAPS) {
805 assert(clazz != nullptr, "clazz must not be null");
806
807 oop mirror = JNIHandles::resolve_non_null(clazz);
808 Klass* k = java_lang_Class::as_Klass(mirror);
809
810 if (k == nullptr || !k->is_array_klass()) {
811 THROW(vmSymbols::java_lang_InvalidClassException());
812 } else if (k->is_typeArray_klass()) {
813 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
814 base = tak->array_header_in_bytes();
815 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
816 scale = (1 << tak->log2_element_size());
817 } else if (k->is_objArray_klass()) {
818 Klass* ek = ObjArrayKlass::cast(k)->element_klass();
819 if (!ek->is_identity_class() && !ek->is_abstract()) {
820 // Arrays of a concrete value class type can have multiple layouts
821 // There's no good value to return, so throwing an exception is the way out
822 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Arrays of a concrete value class don't have a single base and offset");
823 }
824 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
825 scale = heapOopSize;
826 } else {
827 ShouldNotReachHere();
828 }
829 }
830
831 UNSAFE_ENTRY(jint, Unsafe_ArrayInstanceBaseOffset0(JNIEnv *env, jobject unsafe, jarray array)) {
832 assert(array != nullptr, "array must not be null");
833 oop ar = JNIHandles::resolve_non_null(array);
834 assert(ar->is_array(), "Must be an array");
835 ArrayKlass* ak = ArrayKlass::cast(ar->klass());
836 if (ak->is_refArray_klass()) {
837 return arrayOopDesc::base_offset_in_bytes(T_OBJECT);
838 } else if (ak->is_flatArray_klass()) {
839 FlatArrayKlass* fak = FlatArrayKlass::cast(ak);
840 return fak->array_header_in_bytes();
841 } else {
842 ShouldNotReachHere();
843 }
844 } UNSAFE_END
845
846 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset0(JNIEnv *env, jobject unsafe, jclass clazz)) {
847 int base = 0, scale = 0;
848 getBaseAndScale(base, scale, clazz, CHECK_0);
849
850 return field_offset_from_byte_offset(base);
851 } UNSAFE_END
852
853
854 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale0(JNIEnv *env, jobject unsafe, jclass clazz)) {
855 int base = 0, scale = 0;
856 getBaseAndScale(base, scale, clazz, CHECK_0);
857
858 // This VM packs both fields and array elements down to the byte.
859 // But watch out: If this changes, so that array references for
860 // a given primitive type (say, T_BOOLEAN) use different memory units
861 // than fields, this method MUST return zero for such arrays.
862 // For example, the VM used to store sub-word sized fields in full
863 // words in the object layout, so that accessors like getByte(Object,int)
864 // did not really do what one might expect for arrays. Therefore,
865 // this function used to report a zero scale factor, so that the user
866 // would know not to attempt to access sub-word array elements.
867 // // Code for unpacked fields:
868 // if (scale < wordSize) return 0;
869
870 // The following allows for a pretty general fieldOffset cookie scheme,
871 // but requires it to be linear in byte offset.
872 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
873 } UNSAFE_END
874
875 UNSAFE_ENTRY(jint, Unsafe_ArrayInstanceIndexScale0(JNIEnv *env, jobject unsafe, jarray array)) {
876 assert(array != nullptr, "array must not be null");
877 oop ar = JNIHandles::resolve_non_null(array);
878 assert(ar->is_array(), "Must be an array");
879 ArrayKlass* ak = ArrayKlass::cast(ar->klass());
880 if (ak->is_refArray_klass()) {
881 return heapOopSize;
882 } else if (ak->is_flatArray_klass()) {
883 FlatArrayKlass* fak = FlatArrayKlass::cast(ak);
884 return fak->element_byte_size();
885 } else {
886 ShouldNotReachHere();
887 }
888 } UNSAFE_END
889
890 UNSAFE_ENTRY(jarray, Unsafe_GetFieldMap0(JNIEnv* env, jobject unsafe, jclass clazz)) {
891 oop mirror = JNIHandles::resolve_non_null(clazz);
892 Klass* k = java_lang_Class::as_Klass(mirror);
893
894 if (!k->is_inline_klass()) {
895 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not a concrete value class");
896 }
897 InlineKlass* vk = InlineKlass::cast(k);
898 oop map = mirror->obj_field(vk->acmp_maps_offset());
899 return (jarray) JNIHandles::make_local(THREAD, map);
900 } UNSAFE_END
901
902
903 UNSAFE_ENTRY(jlong, Unsafe_GetObjectSize0(JNIEnv* env, jobject o, jobject obj))
904 oop p = JNIHandles::resolve(obj);
905 return p->size() * HeapWordSize;
906 UNSAFE_END
907
908
909 static inline void throw_new(JNIEnv *env, const char *ename) {
910 jclass cls = env->FindClass(ename);
911 if (env->ExceptionCheck()) {
912 env->ExceptionClear();
913 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", ename);
914 return;
915 }
916
917 env->ThrowNew(cls, nullptr);
918 }
919
920 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
921 // Code lifted from JDK 1.3 ClassLoader.c
922
923 jbyte *body;
924 char *utfName = nullptr;
925 jclass result = nullptr;
926 char buf[128];
927
1101 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1102 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1103 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1104 }
1105
1106 return ret;
1107 } UNSAFE_END
1108
1109
1110 /// JVM_RegisterUnsafeMethods
1111
1112 #define ADR "J"
1113
1114 #define LANG "Ljava/lang/"
1115
1116 #define OBJ LANG "Object;"
1117 #define CLS LANG "Class;"
1118 #define FLD LANG "reflect/Field;"
1119 #define THR LANG "Throwable;"
1120
1121 #define OBJ_ARR "[" OBJ
1122
1123 #define DC_Args LANG "String;[BII" LANG "ClassLoader;" "Ljava/security/ProtectionDomain;"
1124 #define DAC_Args CLS "[B[" OBJ
1125
1126 #define CC (char*) /*cast a literal from (const char*)*/
1127 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1128
1129 #define DECLARE_GETPUTOOP(Type, Desc) \
1130 {CC "get" #Type, CC "(" OBJ "J)" #Desc, FN_PTR(Unsafe_Get##Type)}, \
1131 {CC "put" #Type, CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Put##Type)}, \
1132 {CC "get" #Type "Volatile", CC "(" OBJ "J)" #Desc, FN_PTR(Unsafe_Get##Type##Volatile)}, \
1133 {CC "put" #Type "Volatile", CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Put##Type##Volatile)}
1134
1135
1136 static JNINativeMethod jdk_internal_misc_Unsafe_methods[] = {
1137 {CC "getReference", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetReference)},
1138 {CC "putReference", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_PutReference)},
1139 {CC "getReferenceVolatile", CC "(" OBJ "J)" OBJ, FN_PTR(Unsafe_GetReferenceVolatile)},
1140 {CC "putReferenceVolatile", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_PutReferenceVolatile)},
1141
1142 {CC "isFlatField0", CC "(" OBJ ")Z", FN_PTR(Unsafe_IsFlatField)},
1143 {CC "hasNullMarker0", CC "(" OBJ ")Z", FN_PTR(Unsafe_HasNullMarker)},
1144 {CC "nullMarkerOffset0", CC "(" OBJ ")I", FN_PTR(Unsafe_NullMarkerOffset)},
1145 {CC "arrayLayout0", CC "(" OBJ_ARR ")I", FN_PTR(Unsafe_ArrayLayout)},
1146 {CC "fieldLayout0", CC "(" OBJ ")I", FN_PTR(Unsafe_FieldLayout)},
1147 {CC "newSpecialArray", CC "(" CLS "II)[" OBJ, FN_PTR(Unsafe_NewSpecialArray)},
1148 {CC "getFlatValue", CC "(" OBJ "JI" CLS ")" OBJ, FN_PTR(Unsafe_GetFlatValue)},
1149 {CC "putFlatValue", CC "(" OBJ "JI" CLS OBJ ")V", FN_PTR(Unsafe_PutFlatValue)},
1150 {CC "valueHeaderSize", CC "(" CLS ")J", FN_PTR(Unsafe_ValueHeaderSize)},
1151
1152 {CC "getUncompressedObject", CC "(" ADR ")" OBJ, FN_PTR(Unsafe_GetUncompressedObject)},
1153
1154 DECLARE_GETPUTOOP(Boolean, Z),
1155 DECLARE_GETPUTOOP(Byte, B),
1156 DECLARE_GETPUTOOP(Short, S),
1157 DECLARE_GETPUTOOP(Char, C),
1158 DECLARE_GETPUTOOP(Int, I),
1159 DECLARE_GETPUTOOP(Long, J),
1160 DECLARE_GETPUTOOP(Float, F),
1161 DECLARE_GETPUTOOP(Double, D),
1162
1163 {CC "allocateMemory0", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory0)},
1164 {CC "reallocateMemory0", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory0)},
1165 {CC "freeMemory0", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory0)},
1166
1167 {CC "objectFieldOffset0", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset0)},
1168 {CC "knownObjectFieldOffset0", CC "(" CLS LANG "String;)J", FN_PTR(Unsafe_KnownObjectFieldOffset0)},
1169 {CC "staticFieldOffset0", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset0)},
1170 {CC "staticFieldBase0", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBase0)},
1171 {CC "ensureClassInitialized0", CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized0)},
1172 {CC "arrayBaseOffset0", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset0)},
1173 {CC "arrayInstanceBaseOffset0", CC "(" OBJ_ARR ")I", FN_PTR(Unsafe_ArrayInstanceBaseOffset0)},
1174 {CC "arrayIndexScale0", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale0)},
1175 {CC "arrayInstanceIndexScale0", CC "(" OBJ_ARR ")I", FN_PTR(Unsafe_ArrayInstanceIndexScale0)},
1176 {CC "getFieldMap0", CC "(Ljava/lang/Class;)[I", FN_PTR(Unsafe_GetFieldMap0)},
1177 {CC "getObjectSize0", CC "(Ljava/lang/Object;)J", FN_PTR(Unsafe_GetObjectSize0)},
1178
1179 {CC "defineClass0", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)},
1180 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1181 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)},
1182 {CC "compareAndSetReference",CC "(" OBJ "J" OBJ "" OBJ ")Z", FN_PTR(Unsafe_CompareAndSetReference)},
1183 {CC "compareAndSetInt", CC "(" OBJ "J""I""I"")Z", FN_PTR(Unsafe_CompareAndSetInt)},
1184 {CC "compareAndSetLong", CC "(" OBJ "J""J""J"")Z", FN_PTR(Unsafe_CompareAndSetLong)},
1185 {CC "compareAndExchangeReference", CC "(" OBJ "J" OBJ "" OBJ ")" OBJ, FN_PTR(Unsafe_CompareAndExchangeReference)},
1186 {CC "compareAndExchangeInt", CC "(" OBJ "J""I""I"")I", FN_PTR(Unsafe_CompareAndExchangeInt)},
1187 {CC "compareAndExchangeLong", CC "(" OBJ "J""J""J"")J", FN_PTR(Unsafe_CompareAndExchangeLong)},
1188
1189 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)},
1190 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)},
1191
1192 {CC "getLoadAverage0", CC "([DI)I", FN_PTR(Unsafe_GetLoadAverage0)},
1193
1194 {CC "copyMemory0", CC "(" OBJ "J" OBJ "JJ)V", FN_PTR(Unsafe_CopyMemory0)},
1195 {CC "copySwapMemory0", CC "(" OBJ "J" OBJ "JJJ)V", FN_PTR(Unsafe_CopySwapMemory0)},
1196 {CC "writeback0", CC "(" "J" ")V", FN_PTR(Unsafe_WriteBack0)},
1197 {CC "writebackPreSync0", CC "()V", FN_PTR(Unsafe_WriteBackPreSync0)},
1198 {CC "writebackPostSync0", CC "()V", FN_PTR(Unsafe_WriteBackPostSync0)},
1199 {CC "setMemory0", CC "(" OBJ "JJB)V", FN_PTR(Unsafe_SetMemory0)},
1200
1201 {CC "shouldBeInitialized0", CC "(" CLS ")Z", FN_PTR(Unsafe_ShouldBeInitialized0)},
1202 {CC "notifyStrictStaticAccess0", CC "(" CLS "JZ)V", FN_PTR(Unsafe_NotifyStrictStaticAccess0)},
1203
1204 {CC "fullFence", CC "()V", FN_PTR(Unsafe_FullFence)},
1205 };
1206
1207 #undef CC
1208 #undef FN_PTR
1209
1210 #undef ADR
1211 #undef LANG
1212 #undef OBJ
1213 #undef CLS
1214 #undef FLD
1215 #undef THR
1216 #undef DC_Args
1217 #undef DAC_Args
1218
1219 #undef DECLARE_GETPUTOOP
1220
1221
1222 // This function is exported, used by NativeLookup.
|