1 /*
2 * Copyright (c) 2000, 2017, 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 "precompiled.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "memory/allocation.inline.hpp"
29 #include "memory/resourceArea.hpp"
30 #include "oops/objArrayOop.inline.hpp"
31 #include "oops/oop.inline.hpp"
32 #include "prims/jni.h"
33 #include "prims/jvm.h"
34 #include "prims/unsafe.hpp"
35 #include "runtime/atomic.hpp"
36 #include "runtime/globals.hpp"
37 #include "runtime/interfaceSupport.hpp"
38 #include "runtime/orderAccess.inline.hpp"
39 #include "runtime/reflection.hpp"
40 #include "runtime/vm_version.hpp"
41 #include "services/threadService.hpp"
42 #include "trace/tracing.hpp"
43 #include "utilities/copy.hpp"
44 #include "utilities/dtrace.hpp"
45 #include "utilities/macros.hpp"
46 #if INCLUDE_ALL_GCS
47 #include "gc/g1/g1SATBCardTableModRefBS.hpp"
48 #endif // INCLUDE_ALL_GCS
49
50 /**
51 * Implementation of the jdk.internal.misc.Unsafe class
52 */
53
54
55 #define MAX_OBJECT_SIZE \
56 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
57 + ((julong)max_jint * sizeof(double)) )
58
59
60 #define UNSAFE_ENTRY(result_type, header) \
61 JVM_ENTRY(static result_type, header)
62
63 #define UNSAFE_LEAF(result_type, header) \
64 JVM_LEAF(static result_type, header)
65
66 #define UNSAFE_END JVM_END
67
68
69 static inline void* addr_from_java(jlong addr) {
70 // This assert fails in a variety of ways on 32-bit systems.
71 // It is impossible to predict whether native code that converts
72 // pointers to longs will sign-extend or zero-extend the addresses.
73 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
74 return (void*)(uintptr_t)addr;
75 }
76
77 static inline jlong addr_to_java(void* p) {
78 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
79 return (uintptr_t)p;
80 }
81
82
83 // Note: The VM's obj_field and related accessors use byte-scaled
84 // ("unscaled") offsets, just as the unsafe methods do.
85
86 // However, the method Unsafe.fieldOffset explicitly declines to
87 // guarantee this. The field offset values manipulated by the Java user
88 // through the Unsafe API are opaque cookies that just happen to be byte
89 // offsets. We represent this state of affairs by passing the cookies
90 // through conversion functions when going between the VM and the Unsafe API.
91 // The conversion functions just happen to be no-ops at present.
92
93 static inline jlong field_offset_to_byte_offset(jlong field_offset) {
94 return field_offset;
95 }
96
97 static inline jlong field_offset_from_byte_offset(jlong byte_offset) {
98 return byte_offset;
99 }
100
101 static inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
102 jlong byte_offset = field_offset_to_byte_offset(field_offset);
103
104 #ifdef ASSERT
105 if (p != NULL) {
106 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
107 if (byte_offset == (jint)byte_offset) {
108 void* ptr_plus_disp = (address)p + byte_offset;
109 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
110 "raw [ptr+disp] must be consistent with oop::field_base");
111 }
112 jlong p_size = HeapWordSize * (jlong)(p->size());
113 assert(byte_offset < p_size, "Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size);
114 }
115 #endif
116
117 if (sizeof(char*) == sizeof(jint)) { // (this constant folds!)
118 return (address)p + (jint) byte_offset;
119 } else {
120 return (address)p + byte_offset;
121 }
122 }
123
124 // Externally callable versions:
125 // (Use these in compiler intrinsics which emulate unsafe primitives.)
126 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
127 return field_offset;
128 }
129 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
130 return byte_offset;
131 }
132
133
134 ///// Data read/writes on the Java heap and in native (off-heap) memory
135
136 /**
137 * Helper class for accessing memory.
138 *
139 * Normalizes values and wraps accesses in
140 * JavaThread::doing_unsafe_access() if needed.
141 */
142 class MemoryAccess : StackObj {
143 JavaThread* _thread;
144 jobject _obj;
145 jlong _offset;
146
147 // Resolves and returns the address of the memory access
148 void* addr() {
149 return index_oop_from_field_offset_long(JNIHandles::resolve(_obj), _offset);
150 }
151
152 template <typename T>
153 T normalize_for_write(T x) {
154 return x;
155 }
156
157 jboolean normalize_for_write(jboolean x) {
158 return x & 1;
159 }
160
161 template <typename T>
162 T normalize_for_read(T x) {
163 return x;
164 }
165
166 jboolean normalize_for_read(jboolean x) {
167 return x != 0;
168 }
169
170 /**
171 * Helper class to wrap memory accesses in JavaThread::doing_unsafe_access()
172 */
173 class GuardUnsafeAccess {
174 JavaThread* _thread;
175 bool _active;
176
177 public:
178 GuardUnsafeAccess(JavaThread* thread, jobject _obj) : _thread(thread) {
179 if (JNIHandles::resolve(_obj) == NULL) {
180 // native/off-heap access which may raise SIGBUS if accessing
181 // memory mapped file data in a region of the file which has
182 // been truncated and is now invalid
183 _thread->set_doing_unsafe_access(true);
184 _active = true;
185 } else {
186 _active = false;
187 }
188 }
189
190 ~GuardUnsafeAccess() {
191 if (_active) {
192 _thread->set_doing_unsafe_access(false);
193 }
194 }
195 };
196
197 public:
198 MemoryAccess(JavaThread* thread, jobject obj, jlong offset)
199 : _thread(thread), _obj(obj), _offset(offset) {
200 }
201
202 template <typename T>
203 T get() {
204 GuardUnsafeAccess guard(_thread, _obj);
205
206 T* p = (T*)addr();
207
208 T x = normalize_for_read(*p);
209
210 return x;
211 }
212
213 template <typename T>
214 void put(T x) {
215 GuardUnsafeAccess guard(_thread, _obj);
216
217 T* p = (T*)addr();
218
219 *p = normalize_for_write(x);
220 }
221
222
223 template <typename T>
224 T get_volatile() {
225 GuardUnsafeAccess guard(_thread, _obj);
226
227 T* p = (T*)addr();
228
229 if (support_IRIW_for_not_multiple_copy_atomic_cpu) {
230 OrderAccess::fence();
231 }
232
233 T x = OrderAccess::load_acquire((volatile T*)p);
234
235 return normalize_for_read(x);
236 }
237
238 template <typename T>
239 void put_volatile(T x) {
240 GuardUnsafeAccess guard(_thread, _obj);
241
242 T* p = (T*)addr();
243
244 OrderAccess::release_store_fence((volatile T*)p, normalize_for_write(x));
245 }
246
247
248 #ifndef SUPPORTS_NATIVE_CX8
249 jlong get_jlong_locked() {
250 GuardUnsafeAccess guard(_thread, _obj);
251
252 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
253
254 jlong* p = (jlong*)addr();
255
256 jlong x = Atomic::load(p);
257
258 return x;
259 }
260
261 void put_jlong_locked(jlong x) {
262 GuardUnsafeAccess guard(_thread, _obj);
263
264 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
265
266 jlong* p = (jlong*)addr();
267
268 Atomic::store(normalize_for_write(x), p);
269 }
270 #endif
271 };
272
273 // Get/PutObject must be special-cased, since it works with handles.
274
275 // We could be accessing the referent field in a reference
276 // object. If G1 is enabled then we need to register non-null
277 // referent with the SATB barrier.
278
279 #if INCLUDE_ALL_GCS
280 static bool is_java_lang_ref_Reference_access(oop o, jlong offset) {
281 if (offset == java_lang_ref_Reference::referent_offset && o != NULL) {
282 Klass* k = o->klass();
283 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
284 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
285 return true;
286 }
287 }
288 return false;
289 }
290 #endif
291
292 static void ensure_satb_referent_alive(oop o, jlong offset, oop v) {
293 #if INCLUDE_ALL_GCS
294 if (UseG1GC && v != NULL && is_java_lang_ref_Reference_access(o, offset)) {
295 G1SATBCardTableModRefBS::enqueue(v);
296 }
297 #endif
298 }
299
300 // These functions allow a null base pointer with an arbitrary address.
301 // But if the base pointer is non-null, the offset should make some sense.
302 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
303 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) {
304 oop p = JNIHandles::resolve(obj);
305 oop v;
306
307 if (UseCompressedOops) {
308 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset);
309 v = oopDesc::decode_heap_oop(n);
310 } else {
311 v = *(oop*)index_oop_from_field_offset_long(p, offset);
312 }
313
314 ensure_satb_referent_alive(p, offset, v);
315
316 return JNIHandles::make_local(env, v);
317 } UNSAFE_END
318
319 UNSAFE_ENTRY(void, Unsafe_PutObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) {
320 oop x = JNIHandles::resolve(x_h);
321 oop p = JNIHandles::resolve(obj);
322
323 if (UseCompressedOops) {
324 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
325 } else {
326 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
327 }
328 } UNSAFE_END
329
330 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) {
331 oop p = JNIHandles::resolve(obj);
332 void* addr = index_oop_from_field_offset_long(p, offset);
333
334 volatile oop v;
335
336 if (support_IRIW_for_not_multiple_copy_atomic_cpu) {
337 OrderAccess::fence();
338 }
339
340 if (UseCompressedOops) {
341 volatile narrowOop n = *(volatile narrowOop*) addr;
342 (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n));
343 } else {
344 (void)const_cast<oop&>(v = *(volatile oop*) addr);
345 }
346
347 ensure_satb_referent_alive(p, offset, v);
348
349 OrderAccess::acquire();
350 return JNIHandles::make_local(env, v);
351 } UNSAFE_END
352
353 UNSAFE_ENTRY(void, Unsafe_PutObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) {
354 oop x = JNIHandles::resolve(x_h);
355 oop p = JNIHandles::resolve(obj);
356 void* addr = index_oop_from_field_offset_long(p, offset);
357 OrderAccess::release();
358
359 if (UseCompressedOops) {
360 oop_store((narrowOop*)addr, x);
361 } else {
362 oop_store((oop*)addr, x);
363 }
364
365 OrderAccess::fence();
366 } UNSAFE_END
367
368 UNSAFE_ENTRY(jobject, Unsafe_GetUncompressedObject(JNIEnv *env, jobject unsafe, jlong addr)) {
369 oop v = *(oop*) (address) addr;
370
371 return JNIHandles::make_local(env, v);
372 } UNSAFE_END
373
374 #ifndef SUPPORTS_NATIVE_CX8
375
376 // VM_Version::supports_cx8() is a surrogate for 'supports atomic long memory ops'.
377 //
378 // On platforms which do not support atomic compare-and-swap of jlong (8 byte)
379 // values we have to use a lock-based scheme to enforce atomicity. This has to be
380 // applied to all Unsafe operations that set the value of a jlong field. Even so
381 // the compareAndSetLong operation will not be atomic with respect to direct stores
382 // to the field from Java code. It is important therefore that any Java code that
383 // utilizes these Unsafe jlong operations does not perform direct stores. To permit
384 // direct loads of the field from Java code we must also use Atomic::store within the
385 // locked regions. And for good measure, in case there are direct stores, we also
386 // employ Atomic::load within those regions. Note that the field in question must be
387 // volatile and so must have atomic load/store accesses applied at the Java level.
388 //
389 // The locking scheme could utilize a range of strategies for controlling the locking
390 // granularity: from a lock per-field through to a single global lock. The latter is
391 // the simplest and is used for the current implementation. Note that the Java object
392 // that contains the field, can not, in general, be used for locking. To do so can lead
393 // to deadlocks as we may introduce locking into what appears to the Java code to be a
394 // lock-free path.
395 //
396 // As all the locked-regions are very short and themselves non-blocking we can treat
397 // them as leaf routines and elide safepoint checks (ie we don't perform any thread
398 // state transitions even when blocking for the lock). Note that if we do choose to
399 // add safepoint checks and thread state transitions, we must ensure that we calculate
400 // the address of the field _after_ we have acquired the lock, else the object may have
401 // been moved by the GC
402
403 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) {
404 if (VM_Version::supports_cx8()) {
405 return MemoryAccess(thread, obj, offset).get_volatile<jlong>();
406 } else {
407 return MemoryAccess(thread, obj, offset).get_jlong_locked();
408 }
409 } UNSAFE_END
410
411 UNSAFE_ENTRY(void, Unsafe_PutLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) {
412 if (VM_Version::supports_cx8()) {
413 MemoryAccess(thread, obj, offset).put_volatile<jlong>(x);
414 } else {
415 MemoryAccess(thread, obj, offset).put_jlong_locked(x);
416 }
417 } UNSAFE_END
418
419 #endif // not SUPPORTS_NATIVE_CX8
420
421 UNSAFE_LEAF(jboolean, Unsafe_isBigEndian0(JNIEnv *env, jobject unsafe)) {
422 #ifdef VM_LITTLE_ENDIAN
423 return false;
424 #else
425 return true;
426 #endif
427 } UNSAFE_END
428
429 UNSAFE_LEAF(jint, Unsafe_unalignedAccess0(JNIEnv *env, jobject unsafe)) {
430 return UseUnalignedAccesses;
431 } UNSAFE_END
432
433 #define DEFINE_GETSETOOP(java_type, Type) \
434 \
435 UNSAFE_ENTRY(java_type, Unsafe_Get##Type(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) { \
436 return MemoryAccess(thread, obj, offset).get<java_type>(); \
437 } UNSAFE_END \
438 \
439 UNSAFE_ENTRY(void, Unsafe_Put##Type(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, java_type x)) { \
440 MemoryAccess(thread, obj, offset).put<java_type>(x); \
441 } UNSAFE_END \
442 \
443 // END DEFINE_GETSETOOP.
444
445 DEFINE_GETSETOOP(jboolean, Boolean)
446 DEFINE_GETSETOOP(jbyte, Byte)
447 DEFINE_GETSETOOP(jshort, Short);
448 DEFINE_GETSETOOP(jchar, Char);
449 DEFINE_GETSETOOP(jint, Int);
450 DEFINE_GETSETOOP(jlong, Long);
451 DEFINE_GETSETOOP(jfloat, Float);
452 DEFINE_GETSETOOP(jdouble, Double);
453
454 #undef DEFINE_GETSETOOP
455
456 #define DEFINE_GETSETOOP_VOLATILE(java_type, Type) \
457 \
458 UNSAFE_ENTRY(java_type, Unsafe_Get##Type##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) { \
459 return MemoryAccess(thread, obj, offset).get_volatile<java_type>(); \
460 } UNSAFE_END \
461 \
462 UNSAFE_ENTRY(void, Unsafe_Put##Type##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, java_type x)) { \
463 MemoryAccess(thread, obj, offset).put_volatile<java_type>(x); \
464 } UNSAFE_END \
465 \
466 // END DEFINE_GETSETOOP_VOLATILE.
467
468 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
469 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
470 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
471 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
472 DEFINE_GETSETOOP_VOLATILE(jint, Int);
473 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
474 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
475
476 #ifdef SUPPORTS_NATIVE_CX8
477 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
478 #endif
479
480 #undef DEFINE_GETSETOOP_VOLATILE
481
482 UNSAFE_LEAF(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe)) {
483 OrderAccess::acquire();
484 } UNSAFE_END
485
486 UNSAFE_LEAF(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe)) {
487 OrderAccess::release();
488 } UNSAFE_END
489
490 UNSAFE_LEAF(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe)) {
491 OrderAccess::fence();
492 } UNSAFE_END
493
494 ////// Allocation requests
495
496 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls)) {
497 ThreadToNativeFromVM ttnfv(thread);
498 return env->AllocObject(cls);
499 } UNSAFE_END
500
501 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory0(JNIEnv *env, jobject unsafe, jlong size)) {
502 size_t sz = (size_t)size;
503
504 sz = round_to(sz, HeapWordSize);
505 void* x = os::malloc(sz, mtInternal);
506
507 return addr_to_java(x);
508 } UNSAFE_END
509
510 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory0(JNIEnv *env, jobject unsafe, jlong addr, jlong size)) {
511 void* p = addr_from_java(addr);
512 size_t sz = (size_t)size;
513 sz = round_to(sz, HeapWordSize);
514
515 void* x = os::realloc(p, sz, mtInternal);
516
517 return addr_to_java(x);
518 } UNSAFE_END
519
520 UNSAFE_ENTRY(void, Unsafe_FreeMemory0(JNIEnv *env, jobject unsafe, jlong addr)) {
521 void* p = addr_from_java(addr);
522
523 os::free(p);
524 } UNSAFE_END
525
526 UNSAFE_ENTRY(void, Unsafe_SetMemory0(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value)) {
527 size_t sz = (size_t)size;
528
529 oop base = JNIHandles::resolve(obj);
530 void* p = index_oop_from_field_offset_long(base, offset);
531
532 Copy::fill_to_memory_atomic(p, sz, value);
533 } UNSAFE_END
534
535 UNSAFE_ENTRY(void, Unsafe_CopyMemory0(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size)) {
536 size_t sz = (size_t)size;
537
538 oop srcp = JNIHandles::resolve(srcObj);
539 oop dstp = JNIHandles::resolve(dstObj);
540
541 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
542 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
543
544 Copy::conjoint_memory_atomic(src, dst, sz);
545 } UNSAFE_END
546
547 // This function is a leaf since if the source and destination are both in native memory
548 // the copy may potentially be very large, and we don't want to disable GC if we can avoid it.
549 // If either source or destination (or both) are on the heap, the function will enter VM using
550 // JVM_ENTRY_FROM_LEAF
551 UNSAFE_LEAF(void, Unsafe_CopySwapMemory0(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size, jlong elemSize)) {
552 size_t sz = (size_t)size;
553 size_t esz = (size_t)elemSize;
554
555 if (srcObj == NULL && dstObj == NULL) {
556 // Both src & dst are in native memory
557 address src = (address)srcOffset;
558 address dst = (address)dstOffset;
559
560 Copy::conjoint_swap(src, dst, sz, esz);
561 } else {
562 // At least one of src/dst are on heap, transition to VM to access raw pointers
563
564 JVM_ENTRY_FROM_LEAF(env, void, Unsafe_CopySwapMemory0) {
565 oop srcp = JNIHandles::resolve(srcObj);
566 oop dstp = JNIHandles::resolve(dstObj);
567
568 address src = (address)index_oop_from_field_offset_long(srcp, srcOffset);
569 address dst = (address)index_oop_from_field_offset_long(dstp, dstOffset);
570
571 Copy::conjoint_swap(src, dst, sz, esz);
572 } JVM_END
573 }
574 } UNSAFE_END
575
576 ////// Random queries
577
578 UNSAFE_LEAF(jint, Unsafe_AddressSize0(JNIEnv *env, jobject unsafe)) {
579 return sizeof(void*);
580 } UNSAFE_END
581
582 UNSAFE_LEAF(jint, Unsafe_PageSize()) {
583 return os::vm_page_size();
584 } UNSAFE_END
585
586 static jint find_field_offset(jobject field, int must_be_static, TRAPS) {
587 assert(field != NULL, "field must not be NULL");
588
589 oop reflected = JNIHandles::resolve_non_null(field);
590 oop mirror = java_lang_reflect_Field::clazz(reflected);
591 Klass* k = java_lang_Class::as_Klass(mirror);
592 int slot = java_lang_reflect_Field::slot(reflected);
593 int modifiers = java_lang_reflect_Field::modifiers(reflected);
594
595 if (must_be_static >= 0) {
596 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
597 if (must_be_static != really_is_static) {
598 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
599 }
600 }
601
602 int offset = InstanceKlass::cast(k)->field_offset(slot);
603 return field_offset_from_byte_offset(offset);
604 }
605
606 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset0(JNIEnv *env, jobject unsafe, jobject field)) {
607 return find_field_offset(field, 0, THREAD);
608 } UNSAFE_END
609
610 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset0(JNIEnv *env, jobject unsafe, jobject field)) {
611 return find_field_offset(field, 1, THREAD);
612 } UNSAFE_END
613
614 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBase0(JNIEnv *env, jobject unsafe, jobject field)) {
615 assert(field != NULL, "field must not be NULL");
616
617 // Note: In this VM implementation, a field address is always a short
618 // offset from the base of a a klass metaobject. Thus, the full dynamic
619 // range of the return type is never used. However, some implementations
620 // might put the static field inside an array shared by many classes,
621 // or even at a fixed address, in which case the address could be quite
622 // large. In that last case, this function would return NULL, since
623 // the address would operate alone, without any base pointer.
624
625 oop reflected = JNIHandles::resolve_non_null(field);
626 oop mirror = java_lang_reflect_Field::clazz(reflected);
627 int modifiers = java_lang_reflect_Field::modifiers(reflected);
628
629 if ((modifiers & JVM_ACC_STATIC) == 0) {
630 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
631 }
632
633 return JNIHandles::make_local(env, mirror);
634 } UNSAFE_END
635
636 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized0(JNIEnv *env, jobject unsafe, jobject clazz)) {
637 assert(clazz != NULL, "clazz must not be NULL");
638
639 oop mirror = JNIHandles::resolve_non_null(clazz);
640
641 Klass* klass = java_lang_Class::as_Klass(mirror);
642 if (klass != NULL && klass->should_be_initialized()) {
643 InstanceKlass* k = InstanceKlass::cast(klass);
644 k->initialize(CHECK);
645 }
646 }
647 UNSAFE_END
648
649 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized0(JNIEnv *env, jobject unsafe, jobject clazz)) {
650 assert(clazz != NULL, "clazz must not be NULL");
651
652 oop mirror = JNIHandles::resolve_non_null(clazz);
653 Klass* klass = java_lang_Class::as_Klass(mirror);
654
655 if (klass != NULL && klass->should_be_initialized()) {
656 return true;
657 }
658
659 return false;
660 }
661 UNSAFE_END
662
663 static void getBaseAndScale(int& base, int& scale, jclass clazz, TRAPS) {
664 assert(clazz != NULL, "clazz must not be NULL");
665
666 oop mirror = JNIHandles::resolve_non_null(clazz);
667 Klass* k = java_lang_Class::as_Klass(mirror);
668
669 if (k == NULL || !k->is_array_klass()) {
670 THROW(vmSymbols::java_lang_InvalidClassException());
671 } else if (k->is_objArray_klass()) {
672 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
673 scale = heapOopSize;
674 } else if (k->is_typeArray_klass()) {
675 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
676 base = tak->array_header_in_bytes();
677 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
678 scale = (1 << tak->log2_element_size());
679 } else {
680 ShouldNotReachHere();
681 }
682 }
683
684 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset0(JNIEnv *env, jobject unsafe, jclass clazz)) {
685 int base = 0, scale = 0;
686 getBaseAndScale(base, scale, clazz, CHECK_0);
687
688 return field_offset_from_byte_offset(base);
689 } UNSAFE_END
690
691
692 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale0(JNIEnv *env, jobject unsafe, jclass clazz)) {
693 int base = 0, scale = 0;
694 getBaseAndScale(base, scale, clazz, CHECK_0);
695
696 // This VM packs both fields and array elements down to the byte.
697 // But watch out: If this changes, so that array references for
698 // a given primitive type (say, T_BOOLEAN) use different memory units
699 // than fields, this method MUST return zero for such arrays.
700 // For example, the VM used to store sub-word sized fields in full
701 // words in the object layout, so that accessors like getByte(Object,int)
702 // did not really do what one might expect for arrays. Therefore,
703 // this function used to report a zero scale factor, so that the user
704 // would know not to attempt to access sub-word array elements.
705 // // Code for unpacked fields:
706 // if (scale < wordSize) return 0;
707
708 // The following allows for a pretty general fieldOffset cookie scheme,
709 // but requires it to be linear in byte offset.
710 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
711 } UNSAFE_END
712
713
714 static inline void throw_new(JNIEnv *env, const char *ename) {
715 char buf[100];
716
717 jio_snprintf(buf, 100, "%s%s", "java/lang/", ename);
718
719 jclass cls = env->FindClass(buf);
720 if (env->ExceptionCheck()) {
721 env->ExceptionClear();
722 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf);
723 return;
724 }
725
726 env->ThrowNew(cls, NULL);
727 }
728
729 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
730 // Code lifted from JDK 1.3 ClassLoader.c
731
732 jbyte *body;
733 char *utfName = NULL;
734 jclass result = 0;
735 char buf[128];
736
737 assert(data != NULL, "Class bytes must not be NULL");
738 assert(length >= 0, "length must not be negative: %d", length);
739
740 if (UsePerfData) {
741 ClassLoader::unsafe_defineClassCallCounter()->inc();
742 }
743
744 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
745 if (body == NULL) {
746 throw_new(env, "OutOfMemoryError");
747 return 0;
748 }
749
750 env->GetByteArrayRegion(data, offset, length, body);
751 if (env->ExceptionOccurred()) {
752 goto free_body;
753 }
754
755 if (name != NULL) {
756 uint len = env->GetStringUTFLength(name);
757 int unicode_len = env->GetStringLength(name);
758
759 if (len >= sizeof(buf)) {
760 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
761 if (utfName == NULL) {
762 throw_new(env, "OutOfMemoryError");
763 goto free_body;
764 }
765 } else {
766 utfName = buf;
767 }
768
769 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
770
771 for (uint i = 0; i < len; i++) {
772 if (utfName[i] == '.') utfName[i] = '/';
773 }
774 }
775
776 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
777
778 if (utfName && utfName != buf) {
779 FREE_C_HEAP_ARRAY(char, utfName);
780 }
781
782 free_body:
783 FREE_C_HEAP_ARRAY(jbyte, body);
784 return result;
785 }
786
787
788 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd)) {
789 ThreadToNativeFromVM ttnfv(thread);
790
791 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
792 } UNSAFE_END
793
794
795 // define a class but do not make it known to the class loader or system dictionary
796 // - host_class: supplies context for linkage, access control, protection domain, and class loader
797 // if host_class is itself anonymous then it is replaced with its host class.
798 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
799 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
800
801 // When you load an anonymous class U, it works as if you changed its name just before loading,
802 // to a name that you will never use again. Since the name is lost, no other class can directly
803 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
804 // through java.lang.Class methods like Class.newInstance.
805
806 // The package of an anonymous class must either match its host's class's package or be in the
807 // unnamed package. If it is in the unnamed package then it will be put in its host class's
808 // package.
809 //
810
811 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
812 // An anonymous class also has special privileges to access any member of its host class.
813 // This is the main reason why this loading operation is unsafe. The purpose of this is to
814 // allow language implementations to simulate "open classes"; a host class in effect gets
815 // new code when an anonymous class is loaded alongside it. A less convenient but more
816 // standard way to do this is with reflection, which can also be set to ignore access
817 // restrictions.
818
819 // Access into an anonymous class is possible only through reflection. Therefore, there
820 // are no special access rules for calling into an anonymous class. The relaxed access
821 // rule for the host class is applied in the opposite direction: A host class reflectively
822 // access one of its anonymous classes.
823
824 // If you load the same bytecodes twice, you get two different classes. You can reload
825 // the same bytecodes with or without varying CP patches.
826
827 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
828 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
829 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
830
831 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
832 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
833 // It is not possible for a named class, or an older anonymous class, to refer by
834 // name (via its CP) to a newer anonymous class.
835
836 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
837 // or type descriptors used in the loaded anonymous class.
838
839 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
840 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
841 // be changed to println(greeting), where greeting is an arbitrary object created before
842 // the anonymous class is loaded. This is useful in dynamic languages, in which
843 // various kinds of metaobjects must be introduced as constants into bytecode.
844 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
845 // not just a literal string. For such ldc instructions, the verifier uses the
846 // type Object instead of String, if the loaded constant is not in fact a String.
847
848 static InstanceKlass*
849 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
850 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
851 u1** temp_alloc,
852 TRAPS) {
853 assert(host_class != NULL, "host_class must not be NULL");
854 assert(data != NULL, "data must not be NULL");
855
856 if (UsePerfData) {
857 ClassLoader::unsafe_defineClassCallCounter()->inc();
858 }
859
860 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
861 assert(length >= 0, "class_bytes_length must not be negative: %d", length);
862
863 int class_bytes_length = (int) length;
864
865 u1* class_bytes = NEW_C_HEAP_ARRAY(u1, length, mtInternal);
866 if (class_bytes == NULL) {
867 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
868 }
869
870 // caller responsible to free it:
871 *temp_alloc = class_bytes;
872
873 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
874 Copy::conjoint_jbytes(array_base, class_bytes, length);
875
876 objArrayHandle cp_patches_h;
877 if (cp_patches_jh != NULL) {
878 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
879 assert(p->is_objArray(), "cp_patches must be an object[]");
880 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
881 }
882
883 const Klass* host_klass = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class));
884
885 // Make sure it's the real host class, not another anonymous class.
886 while (host_klass != NULL && host_klass->is_instance_klass() &&
887 InstanceKlass::cast(host_klass)->is_anonymous()) {
888 host_klass = InstanceKlass::cast(host_klass)->host_klass();
889 }
890
891 // Primitive types have NULL Klass* fields in their java.lang.Class instances.
892 if (host_klass == NULL) {
893 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Host class is null");
894 }
895
896 assert(host_klass->is_instance_klass(), "Host class must be an instance class");
897
898 const char* host_source = host_klass->external_name();
899 Handle host_loader(THREAD, host_klass->class_loader());
900 Handle host_domain(THREAD, host_klass->protection_domain());
901
902 GrowableArray<Handle>* cp_patches = NULL;
903
904 if (cp_patches_h.not_null()) {
905 int alen = cp_patches_h->length();
906
907 for (int i = alen-1; i >= 0; i--) {
908 oop p = cp_patches_h->obj_at(i);
909 if (p != NULL) {
910 Handle patch(THREAD, p);
911
912 if (cp_patches == NULL) {
913 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
914 }
915
916 cp_patches->at_put(i, patch);
917 }
918 }
919 }
920
921 ClassFileStream st(class_bytes, class_bytes_length, host_source, ClassFileStream::verify);
922
923 Symbol* no_class_name = NULL;
924 Klass* anonk = SystemDictionary::parse_stream(no_class_name,
925 host_loader,
926 host_domain,
927 &st,
928 InstanceKlass::cast(host_klass),
929 cp_patches,
930 CHECK_NULL);
931 if (anonk == NULL) {
932 return NULL;
933 }
934
935 return InstanceKlass::cast(anonk);
936 }
937
938 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass0(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh)) {
939 ResourceMark rm(THREAD);
940
941 jobject res_jh = NULL;
942 u1* temp_alloc = NULL;
943
944 InstanceKlass* anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data, cp_patches_jh, &temp_alloc, THREAD);
945 if (anon_klass != NULL) {
946 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
947 }
948
949 // try/finally clause:
950 if (temp_alloc != NULL) {
951 FREE_C_HEAP_ARRAY(u1, temp_alloc);
952 }
953
954 // The anonymous class loader data has been artificially been kept alive to
955 // this point. The mirror and any instances of this class have to keep
956 // it alive afterwards.
957 if (anon_klass != NULL) {
958 anon_klass->class_loader_data()->dec_keep_alive();
959 }
960
961 // let caller initialize it as needed...
962
963 return (jclass) res_jh;
964 } UNSAFE_END
965
966
967
968 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr)) {
969 ThreadToNativeFromVM ttnfv(thread);
970 env->Throw(thr);
971 } UNSAFE_END
972
973 // JSR166 ------------------------------------------------------------------
974
975 UNSAFE_ENTRY(jobject, Unsafe_CompareAndExchangeObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h)) {
976 oop x = JNIHandles::resolve(x_h);
977 oop e = JNIHandles::resolve(e_h);
978 oop p = JNIHandles::resolve(obj);
979 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
980 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
981 if (res == e) {
982 update_barrier_set((void*)addr, x);
983 }
984 return JNIHandles::make_local(env, res);
985 } UNSAFE_END
986
987 UNSAFE_ENTRY(jint, Unsafe_CompareAndExchangeInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x)) {
988 oop p = JNIHandles::resolve(obj);
989 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
990
991 return (jint)(Atomic::cmpxchg(x, addr, e));
992 } UNSAFE_END
993
994 UNSAFE_ENTRY(jlong, Unsafe_CompareAndExchangeLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x)) {
995 Handle p(THREAD, JNIHandles::resolve(obj));
996 jlong* addr = (jlong*)index_oop_from_field_offset_long(p(), offset);
997
998 #ifdef SUPPORTS_NATIVE_CX8
999 return (jlong)(Atomic::cmpxchg(x, addr, e));
1000 #else
1001 if (VM_Version::supports_cx8()) {
1002 return (jlong)(Atomic::cmpxchg(x, addr, e));
1003 } else {
1004 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
1005
1006 jlong val = Atomic::load(addr);
1007 if (val == e) {
1008 Atomic::store(x, addr);
1009 }
1010 return val;
1011 }
1012 #endif
1013 } UNSAFE_END
1014
1015 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h)) {
1016 oop x = JNIHandles::resolve(x_h);
1017 oop e = JNIHandles::resolve(e_h);
1018 oop p = JNIHandles::resolve(obj);
1019 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1020 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
1021 if (res != e) {
1022 return false;
1023 }
1024
1025 update_barrier_set((void*)addr, x);
1026
1027 return true;
1028 } UNSAFE_END
1029
1030 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSetInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x)) {
1031 oop p = JNIHandles::resolve(obj);
1032 jint* addr = (jint *)index_oop_from_field_offset_long(p, offset);
1033
1034 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1035 } UNSAFE_END
1036
1037 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSetLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x)) {
1038 Handle p(THREAD, JNIHandles::resolve(obj));
1039 jlong* addr = (jlong*)index_oop_from_field_offset_long(p(), offset);
1040
1041 #ifdef SUPPORTS_NATIVE_CX8
1042 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1043 #else
1044 if (VM_Version::supports_cx8()) {
1045 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1046 } else {
1047 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
1048
1049 jlong val = Atomic::load(addr);
1050 if (val != e) {
1051 return false;
1052 }
1053
1054 Atomic::store(x, addr);
1055 return true;
1056 }
1057 #endif
1058 } UNSAFE_END
1059
1060 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time)) {
1061 EventThreadPark event;
1062 HOTSPOT_THREAD_PARK_BEGIN((uintptr_t) thread->parker(), (int) isAbsolute, time);
1063
1064 JavaThreadParkedState jtps(thread, time != 0);
1065 thread->parker()->park(isAbsolute != 0, time);
1066
1067 HOTSPOT_THREAD_PARK_END((uintptr_t) thread->parker());
1068
1069 if (event.should_commit()) {
1070 oop obj = thread->current_park_blocker();
1071 event.set_parkedClass((obj != NULL) ? obj->klass() : NULL);
1072 event.set_timeout(time);
1073 event.set_address((obj != NULL) ? (TYPE_ADDRESS) cast_from_oop<uintptr_t>(obj) : 0);
1074 event.commit();
1075 }
1076 } UNSAFE_END
1077
1078 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread)) {
1079 Parker* p = NULL;
1080
1081 if (jthread != NULL) {
1082 oop java_thread = JNIHandles::resolve_non_null(jthread);
1083 if (java_thread != NULL) {
1084 jlong lp = java_lang_Thread::park_event(java_thread);
1085 if (lp != 0) {
1086 // This cast is OK even though the jlong might have been read
1087 // non-atomically on 32bit systems, since there, one word will
1088 // always be zero anyway and the value set is always the same
1089 p = (Parker*)addr_from_java(lp);
1090 } else {
1091 // Grab lock if apparently null or using older version of library
1092 MutexLocker mu(Threads_lock);
1093 java_thread = JNIHandles::resolve_non_null(jthread);
1094
1095 if (java_thread != NULL) {
1096 JavaThread* thr = java_lang_Thread::thread(java_thread);
1097 if (thr != NULL) {
1098 p = thr->parker();
1099 if (p != NULL) { // Bind to Java thread for next time.
1100 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1101 }
1102 }
1103 }
1104 }
1105 }
1106 }
1107
1108 if (p != NULL) {
1109 HOTSPOT_THREAD_UNPARK((uintptr_t) p);
1110 p->unpark();
1111 }
1112 } UNSAFE_END
1113
1114 UNSAFE_ENTRY(jint, Unsafe_GetLoadAverage0(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem)) {
1115 const int max_nelem = 3;
1116 double la[max_nelem];
1117 jint ret;
1118
1119 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1120 assert(a->is_typeArray(), "must be type array");
1121
1122 ret = os::loadavg(la, nelem);
1123 if (ret == -1) {
1124 return -1;
1125 }
1126
1127 // if successful, ret is the number of samples actually retrieved.
1128 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1129 switch(ret) {
1130 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1131 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1132 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1133 }
1134
1135 return ret;
1136 } UNSAFE_END
1137
1138
1139 /// JVM_RegisterUnsafeMethods
1140
1141 #define ADR "J"
1142
1143 #define LANG "Ljava/lang/"
1144
1145 #define OBJ LANG "Object;"
1146 #define CLS LANG "Class;"
1147 #define FLD LANG "reflect/Field;"
1148 #define THR LANG "Throwable;"
1149
1150 #define DC_Args LANG "String;[BII" LANG "ClassLoader;" "Ljava/security/ProtectionDomain;"
1151 #define DAC_Args CLS "[B[" OBJ
1152
1153 #define CC (char*) /*cast a literal from (const char*)*/
1154 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1155
1156 #define DECLARE_GETPUTOOP(Type, Desc) \
1157 {CC "get" #Type, CC "(" OBJ "J)" #Desc, FN_PTR(Unsafe_Get##Type)}, \
1158 {CC "put" #Type, CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Put##Type)}, \
1159 {CC "get" #Type "Volatile", CC "(" OBJ "J)" #Desc, FN_PTR(Unsafe_Get##Type##Volatile)}, \
1160 {CC "put" #Type "Volatile", CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Put##Type##Volatile)}
1161
1162
1163 static JNINativeMethod jdk_internal_misc_Unsafe_methods[] = {
1164 {CC "getObject", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObject)},
1165 {CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_PutObject)},
1166 {CC "getObjectVolatile",CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObjectVolatile)},
1167 {CC "putObjectVolatile",CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_PutObjectVolatile)},
1168
1169 {CC "getUncompressedObject", CC "(" ADR ")" OBJ, FN_PTR(Unsafe_GetUncompressedObject)},
1170
1171 DECLARE_GETPUTOOP(Boolean, Z),
1172 DECLARE_GETPUTOOP(Byte, B),
1173 DECLARE_GETPUTOOP(Short, S),
1174 DECLARE_GETPUTOOP(Char, C),
1175 DECLARE_GETPUTOOP(Int, I),
1176 DECLARE_GETPUTOOP(Long, J),
1177 DECLARE_GETPUTOOP(Float, F),
1178 DECLARE_GETPUTOOP(Double, D),
1179
1180 {CC "allocateMemory0", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory0)},
1181 {CC "reallocateMemory0", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory0)},
1182 {CC "freeMemory0", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory0)},
1183
1184 {CC "objectFieldOffset0", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset0)},
1185 {CC "staticFieldOffset0", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset0)},
1186 {CC "staticFieldBase0", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBase0)},
1187 {CC "ensureClassInitialized0", CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized0)},
1188 {CC "arrayBaseOffset0", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset0)},
1189 {CC "arrayIndexScale0", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale0)},
1190 {CC "addressSize0", CC "()I", FN_PTR(Unsafe_AddressSize0)},
1191 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1192
1193 {CC "defineClass0", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)},
1194 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1195 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)},
1196 {CC "compareAndSetObject",CC "(" OBJ "J" OBJ "" OBJ ")Z", FN_PTR(Unsafe_CompareAndSetObject)},
1197 {CC "compareAndSetInt", CC "(" OBJ "J""I""I"")Z", FN_PTR(Unsafe_CompareAndSetInt)},
1198 {CC "compareAndSetLong", CC "(" OBJ "J""J""J"")Z", FN_PTR(Unsafe_CompareAndSetLong)},
1199 {CC "compareAndExchangeObject", CC "(" OBJ "J" OBJ "" OBJ ")" OBJ, FN_PTR(Unsafe_CompareAndExchangeObject)},
1200 {CC "compareAndExchangeInt", CC "(" OBJ "J""I""I"")I", FN_PTR(Unsafe_CompareAndExchangeInt)},
1201 {CC "compareAndExchangeLong", CC "(" OBJ "J""J""J"")J", FN_PTR(Unsafe_CompareAndExchangeLong)},
1202
1203 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)},
1204 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)},
1205
1206 {CC "getLoadAverage0", CC "([DI)I", FN_PTR(Unsafe_GetLoadAverage0)},
1207
1208 {CC "copyMemory0", CC "(" OBJ "J" OBJ "JJ)V", FN_PTR(Unsafe_CopyMemory0)},
1209 {CC "copySwapMemory0", CC "(" OBJ "J" OBJ "JJJ)V", FN_PTR(Unsafe_CopySwapMemory0)},
1210 {CC "setMemory0", CC "(" OBJ "JJB)V", FN_PTR(Unsafe_SetMemory0)},
1211
1212 {CC "defineAnonymousClass0", CC "(" DAC_Args ")" CLS, FN_PTR(Unsafe_DefineAnonymousClass0)},
1213
1214 {CC "shouldBeInitialized0", CC "(" CLS ")Z", FN_PTR(Unsafe_ShouldBeInitialized0)},
1215
1216 {CC "loadFence", CC "()V", FN_PTR(Unsafe_LoadFence)},
1217 {CC "storeFence", CC "()V", FN_PTR(Unsafe_StoreFence)},
1218 {CC "fullFence", CC "()V", FN_PTR(Unsafe_FullFence)},
1219
1220 {CC "isBigEndian0", CC "()Z", FN_PTR(Unsafe_isBigEndian0)},
1221 {CC "unalignedAccess0", CC "()Z", FN_PTR(Unsafe_unalignedAccess0)}
1222 };
1223
1224 #undef CC
1225 #undef FN_PTR
1226
1227 #undef ADR
1228 #undef LANG
1229 #undef OBJ
1230 #undef CLS
1231 #undef FLD
1232 #undef THR
1233 #undef DC_Args
1234 #undef DAC_Args
1235
1236 #undef DECLARE_GETPUTOOP
1237
1238
1239 // This function is exported, used by NativeLookup.
1240 // The Unsafe_xxx functions above are called only from the interpreter.
1241 // The optimizer looks at names and signatures to recognize
1242 // individual functions.
1243
1244 JVM_ENTRY(void, JVM_RegisterJDKInternalMiscUnsafeMethods(JNIEnv *env, jclass unsafeclass)) {
1245 ThreadToNativeFromVM ttnfv(thread);
1246
1247 int ok = env->RegisterNatives(unsafeclass, jdk_internal_misc_Unsafe_methods, sizeof(jdk_internal_misc_Unsafe_methods)/sizeof(JNINativeMethod));
1248 guarantee(ok == 0, "register jdk.internal.misc.Unsafe natives");
1249 } JVM_END