1 /*
2 * Copyright (c) 2000, 2018, 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 "jni.h"
27 #include "jvm.h"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "jfr/jfrEvents.hpp"
31 #include "memory/allocation.inline.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "oops/access.inline.hpp"
34 #include "oops/fieldStreams.hpp"
35 #include "oops/objArrayOop.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "oops/typeArrayOop.inline.hpp"
38 #include "prims/unsafe.hpp"
39 #include "runtime/atomic.hpp"
40 #include "runtime/globals.hpp"
41 #include "runtime/interfaceSupport.inline.hpp"
42 #include "runtime/jniHandles.inline.hpp"
43 #include "runtime/orderAccess.hpp"
44 #include "runtime/reflection.hpp"
45 #include "runtime/sharedRuntime.hpp"
46 #include "runtime/thread.hpp"
47 #include "runtime/threadSMR.hpp"
48 #include "runtime/vm_version.hpp"
49 #include "services/threadService.hpp"
50 #include "utilities/align.hpp"
51 #include "utilities/copy.hpp"
52 #include "utilities/dtrace.hpp"
53 #include "utilities/macros.hpp"
54
55 /**
56 * Implementation of the jdk.internal.misc.Unsafe class
57 */
58
59
60 #define MAX_OBJECT_SIZE \
61 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
62 + ((julong)max_jint * sizeof(double)) )
63
64
65 #define UNSAFE_ENTRY(result_type, header) \
66 JVM_ENTRY(static result_type, header)
67
68 #define UNSAFE_LEAF(result_type, header) \
69 JVM_LEAF(static result_type, header)
70
71 #define UNSAFE_END JVM_END
72
73
74 static inline void* addr_from_java(jlong addr) {
75 // This assert fails in a variety of ways on 32-bit systems.
76 // It is impossible to predict whether native code that converts
77 // pointers to longs will sign-extend or zero-extend the addresses.
78 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
79 return (void*)(uintptr_t)addr;
80 }
81
82 static inline jlong addr_to_java(void* p) {
83 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
84 return (uintptr_t)p;
85 }
86
87
88 // Note: The VM's obj_field and related accessors use byte-scaled
89 // ("unscaled") offsets, just as the unsafe methods do.
90
91 // However, the method Unsafe.fieldOffset explicitly declines to
92 // guarantee this. The field offset values manipulated by the Java user
93 // through the Unsafe API are opaque cookies that just happen to be byte
94 // offsets. We represent this state of affairs by passing the cookies
95 // through conversion functions when going between the VM and the Unsafe API.
96 // The conversion functions just happen to be no-ops at present.
97
98 static inline jlong field_offset_to_byte_offset(jlong field_offset) {
99 return field_offset;
100 }
101
102 static inline jlong field_offset_from_byte_offset(jlong byte_offset) {
103 return byte_offset;
104 }
105
106 static inline void assert_field_offset_sane(oop p, jlong field_offset) {
107 #ifdef ASSERT
108 jlong byte_offset = field_offset_to_byte_offset(field_offset);
109
110 if (p != NULL) {
111 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
112 if (byte_offset == (jint)byte_offset) {
113 void* ptr_plus_disp = (address)p + byte_offset;
114 assert(p->field_addr_raw((jint)byte_offset) == ptr_plus_disp,
115 "raw [ptr+disp] must be consistent with oop::field_addr_raw");
116 }
117 jlong p_size = HeapWordSize * (jlong)(p->size());
118 assert(byte_offset < p_size, "Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, (int64_t)byte_offset, (int64_t)p_size);
119 }
120 #endif
121 }
122
123 static inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
124 assert_field_offset_sane(p, field_offset);
125 jlong byte_offset = field_offset_to_byte_offset(field_offset);
126
127 if (p != NULL) {
128 p = Access<>::resolve(p);
129 }
130
131 if (sizeof(char*) == sizeof(jint)) { // (this constant folds!)
132 return (address)p + (jint) byte_offset;
133 } else {
134 return (address)p + byte_offset;
135 }
136 }
137
138 // Externally callable versions:
139 // (Use these in compiler intrinsics which emulate unsafe primitives.)
140 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
141 return field_offset;
142 }
143 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
144 return byte_offset;
145 }
146
147
148 ///// Data read/writes on the Java heap and in native (off-heap) memory
149
150 /**
151 * Helper class for accessing memory.
152 *
153 * Normalizes values and wraps accesses in
154 * JavaThread::doing_unsafe_access() if needed.
155 */
156 template <typename T>
157 class MemoryAccess : StackObj {
158 JavaThread* _thread;
159 oop _obj;
160 ptrdiff_t _offset;
161
162 // Resolves and returns the address of the memory access.
163 // This raw memory access may fault, so we make sure it happens within the
164 // guarded scope by making the access volatile at least. Since the store
165 // of Thread::set_doing_unsafe_access() is also volatile, these accesses
166 // can not be reordered by the compiler. Therefore, if the access triggers
167 // a fault, we will know that Thread::doing_unsafe_access() returns true.
168 volatile T* addr() {
169 void* addr = index_oop_from_field_offset_long(_obj, _offset);
170 return static_cast<volatile T*>(addr);
171 }
172
173 template <typename U>
174 U normalize_for_write(U x) {
175 return x;
176 }
177
178 jboolean normalize_for_write(jboolean x) {
179 return x & 1;
180 }
181
182 template <typename U>
183 U normalize_for_read(U x) {
184 return x;
185 }
186
187 jboolean normalize_for_read(jboolean x) {
188 return x != 0;
189 }
190
191 /**
192 * Helper class to wrap memory accesses in JavaThread::doing_unsafe_access()
193 */
194 class GuardUnsafeAccess {
195 JavaThread* _thread;
196
197 public:
198 GuardUnsafeAccess(JavaThread* thread) : _thread(thread) {
199 // native/off-heap access which may raise SIGBUS if accessing
200 // memory mapped file data in a region of the file which has
201 // been truncated and is now invalid
202 _thread->set_doing_unsafe_access(true);
203 }
204
205 ~GuardUnsafeAccess() {
206 _thread->set_doing_unsafe_access(false);
207 }
208 };
209
210 public:
211 MemoryAccess(JavaThread* thread, jobject obj, jlong offset)
212 : _thread(thread), _obj(JNIHandles::resolve(obj)), _offset((ptrdiff_t)offset) {
213 assert_field_offset_sane(_obj, offset);
214 }
215
216 T get() {
217 if (_obj == NULL) {
218 GuardUnsafeAccess guard(_thread);
219 T ret = RawAccess<>::load(addr());
220 return normalize_for_read(ret);
221 } else {
222 T ret = HeapAccess<>::load_at(_obj, _offset);
223 return normalize_for_read(ret);
224 }
225 }
226
227 void put(T x) {
228 if (_obj == NULL) {
229 GuardUnsafeAccess guard(_thread);
230 RawAccess<>::store(addr(), normalize_for_write(x));
231 } else {
232 HeapAccess<>::store_at(_obj, _offset, normalize_for_write(x));
233 }
234 }
235
236
237 T get_volatile() {
238 if (_obj == NULL) {
239 GuardUnsafeAccess guard(_thread);
240 volatile T ret = RawAccess<MO_SEQ_CST>::load(addr());
241 return normalize_for_read(ret);
242 } else {
243 T ret = HeapAccess<MO_SEQ_CST>::load_at(_obj, _offset);
244 return normalize_for_read(ret);
245 }
246 }
247
248 void put_volatile(T x) {
249 if (_obj == NULL) {
250 GuardUnsafeAccess guard(_thread);
251 RawAccess<MO_SEQ_CST>::store(addr(), normalize_for_write(x));
252 } else {
253 HeapAccess<MO_SEQ_CST>::store_at(_obj, _offset, normalize_for_write(x));
254 }
255 }
256 };
257
258 // These functions allow a null base pointer with an arbitrary address.
259 // But if the base pointer is non-null, the offset should make some sense.
260 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
261 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) {
262 oop p = JNIHandles::resolve(obj);
263 assert_field_offset_sane(p, offset);
264 oop v = HeapAccess<ON_UNKNOWN_OOP_REF>::oop_load_at(p, offset);
265 return JNIHandles::make_local(env, v);
266 } UNSAFE_END
267
268 UNSAFE_ENTRY(void, Unsafe_PutObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) {
269 oop x = JNIHandles::resolve(x_h);
270 oop p = JNIHandles::resolve(obj);
271 assert_field_offset_sane(p, offset);
272 HeapAccess<ON_UNKNOWN_OOP_REF>::oop_store_at(p, offset, x);
273 } UNSAFE_END
274
275 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) {
276 oop p = JNIHandles::resolve(obj);
277 assert_field_offset_sane(p, offset);
278 oop v = HeapAccess<MO_SEQ_CST | ON_UNKNOWN_OOP_REF>::oop_load_at(p, offset);
279 return JNIHandles::make_local(env, v);
280 } UNSAFE_END
281
282 UNSAFE_ENTRY(void, Unsafe_PutObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) {
283 oop x = JNIHandles::resolve(x_h);
284 oop p = JNIHandles::resolve(obj);
285 assert_field_offset_sane(p, offset);
286 HeapAccess<MO_SEQ_CST | ON_UNKNOWN_OOP_REF>::oop_store_at(p, offset, x);
287 } UNSAFE_END
288
289 UNSAFE_ENTRY(jobject, Unsafe_GetUncompressedObject(JNIEnv *env, jobject unsafe, jlong addr)) {
290 oop v = *(oop*) (address) addr;
291 return JNIHandles::make_local(env, v);
292 } UNSAFE_END
293
294 UNSAFE_LEAF(jboolean, Unsafe_isBigEndian0(JNIEnv *env, jobject unsafe)) {
295 #ifdef VM_LITTLE_ENDIAN
296 return false;
297 #else
298 return true;
299 #endif
300 } UNSAFE_END
301
302 UNSAFE_LEAF(jint, Unsafe_unalignedAccess0(JNIEnv *env, jobject unsafe)) {
303 return UseUnalignedAccesses;
304 } UNSAFE_END
305
306 #define DEFINE_GETSETOOP(java_type, Type) \
307 \
308 UNSAFE_ENTRY(java_type, Unsafe_Get##Type(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) { \
309 return MemoryAccess<java_type>(thread, obj, offset).get(); \
310 } UNSAFE_END \
311 \
312 UNSAFE_ENTRY(void, Unsafe_Put##Type(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, java_type x)) { \
313 MemoryAccess<java_type>(thread, obj, offset).put(x); \
314 } UNSAFE_END \
315 \
316 // END DEFINE_GETSETOOP.
317
318 DEFINE_GETSETOOP(jboolean, Boolean)
319 DEFINE_GETSETOOP(jbyte, Byte)
320 DEFINE_GETSETOOP(jshort, Short);
321 DEFINE_GETSETOOP(jchar, Char);
322 DEFINE_GETSETOOP(jint, Int);
323 DEFINE_GETSETOOP(jlong, Long);
324 DEFINE_GETSETOOP(jfloat, Float);
325 DEFINE_GETSETOOP(jdouble, Double);
326
327 #undef DEFINE_GETSETOOP
328
329 #define DEFINE_GETSETOOP_VOLATILE(java_type, Type) \
330 \
331 UNSAFE_ENTRY(java_type, Unsafe_Get##Type##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) { \
332 return MemoryAccess<java_type>(thread, obj, offset).get_volatile(); \
333 } UNSAFE_END \
334 \
335 UNSAFE_ENTRY(void, Unsafe_Put##Type##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, java_type x)) { \
336 MemoryAccess<java_type>(thread, obj, offset).put_volatile(x); \
337 } UNSAFE_END \
338 \
339 // END DEFINE_GETSETOOP_VOLATILE.
340
341 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
342 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
343 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
344 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
345 DEFINE_GETSETOOP_VOLATILE(jint, Int);
346 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
347 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
348 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
349
350 #undef DEFINE_GETSETOOP_VOLATILE
351
352 UNSAFE_LEAF(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe)) {
353 OrderAccess::acquire();
354 } UNSAFE_END
355
356 UNSAFE_LEAF(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe)) {
357 OrderAccess::release();
358 } UNSAFE_END
359
360 UNSAFE_LEAF(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe)) {
361 OrderAccess::fence();
362 } UNSAFE_END
363
364 ////// Allocation requests
365
366 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls)) {
367 ThreadToNativeFromVM ttnfv(thread);
368 return env->AllocObject(cls);
369 } UNSAFE_END
370
371 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory0(JNIEnv *env, jobject unsafe, jlong size)) {
372 size_t sz = (size_t)size;
373
374 sz = align_up(sz, HeapWordSize);
375 void* x = os::malloc(sz, mtOther);
376
377 return addr_to_java(x);
378 } UNSAFE_END
379
380 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory0(JNIEnv *env, jobject unsafe, jlong addr, jlong size)) {
381 void* p = addr_from_java(addr);
382 size_t sz = (size_t)size;
383 sz = align_up(sz, HeapWordSize);
384
385 void* x = os::realloc(p, sz, mtOther);
386
387 return addr_to_java(x);
388 } UNSAFE_END
389
390 UNSAFE_ENTRY(void, Unsafe_FreeMemory0(JNIEnv *env, jobject unsafe, jlong addr)) {
391 void* p = addr_from_java(addr);
392
393 os::free(p);
394 } UNSAFE_END
395
396 UNSAFE_ENTRY(void, Unsafe_SetMemory0(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value)) {
397 size_t sz = (size_t)size;
398
399 oop base = JNIHandles::resolve(obj);
400 void* p = index_oop_from_field_offset_long(base, offset);
401
402 Copy::fill_to_memory_atomic(p, sz, value);
403 } UNSAFE_END
404
405 UNSAFE_ENTRY(void, Unsafe_CopyMemory0(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size)) {
406 size_t sz = (size_t)size;
407
408 oop srcp = JNIHandles::resolve(srcObj);
409 oop dstp = JNIHandles::resolve(dstObj);
410
411 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
412 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
413
414 Copy::conjoint_memory_atomic(src, dst, sz);
415 } UNSAFE_END
416
417 // This function is a leaf since if the source and destination are both in native memory
418 // the copy may potentially be very large, and we don't want to disable GC if we can avoid it.
419 // If either source or destination (or both) are on the heap, the function will enter VM using
420 // JVM_ENTRY_FROM_LEAF
421 UNSAFE_LEAF(void, Unsafe_CopySwapMemory0(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size, jlong elemSize)) {
422 size_t sz = (size_t)size;
423 size_t esz = (size_t)elemSize;
424
425 if (srcObj == NULL && dstObj == NULL) {
426 // Both src & dst are in native memory
427 address src = (address)srcOffset;
428 address dst = (address)dstOffset;
429
430 Copy::conjoint_swap(src, dst, sz, esz);
431 } else {
432 // At least one of src/dst are on heap, transition to VM to access raw pointers
433
434 JVM_ENTRY_FROM_LEAF(env, void, Unsafe_CopySwapMemory0) {
435 oop srcp = JNIHandles::resolve(srcObj);
436 oop dstp = JNIHandles::resolve(dstObj);
437
438 address src = (address)index_oop_from_field_offset_long(srcp, srcOffset);
439 address dst = (address)index_oop_from_field_offset_long(dstp, dstOffset);
440
441 Copy::conjoint_swap(src, dst, sz, esz);
442 } JVM_END
443 }
444 } UNSAFE_END
445
446 UNSAFE_LEAF (void, Unsafe_WriteBack0(JNIEnv *env, jobject unsafe, jlong line)) {
447 #ifndef PRODUCT
448 if (TraceMemoryWriteback) {
449 tty->print_cr("Unsafe: writeback 0x%p", addr_from_java(line));
450 }
451 #endif
452
453 // guard against currently unimplemented cases
454 #if !defined(LINUX) || !(defined(AARCH64) || defined(AMD64))
455 // TODO - implement for solaris/AIX/BSD/WINDOWS and for 32 bit
456 JNU_ThrowRuntimeException(env, "writeback is not implemented");
457 return IOS_THROWN;
458 #else
459 void (*wb)(void *);
460 void *a = addr_from_java(line);
461 wb = (void (*)(void *)) StubRoutines::data_cache_writeback();
462 assert(wb != NULL, "generate writeback stub!");
463 (*wb)(a);
464 #endif
465 } UNSAFE_END
466
467 static void doWriteBackSync0(bool isPre)
468 {
469 void (*wbsync)(int);
470 wbsync = (void (*)(int)) StubRoutines::data_cache_writeback_sync();
471 assert(wbsync != NULL, "generate writeback sync stub!");
472 (*wbsync)(isPre);
473 }
474
475 UNSAFE_LEAF (void, Unsafe_WriteBackPreSync0(JNIEnv *env, jobject unsafe)) {
476 #ifndef PRODUCT
477 if (TraceMemoryWriteback) {
478 tty->print_cr("Unsafe: writeback pre-sync");
479 }
480 #endif
481 #if !defined(LINUX) || !(defined(AARCH64) || defined(AMD64))
482 // TODO - implement for solaris/AIX/BSD/WINDOWS and for 32 bit
483 JNU_ThrowRuntimeException(env, "writeback sync is not implemented");
484 return IOS_THROWN;
485 #else
486 doWriteBackSync0(true);
487 #endif
488 } UNSAFE_END
489
490 UNSAFE_LEAF (void, Unsafe_WriteBackPostSync0(JNIEnv *env, jobject unsafe)) {
491 #ifndef PRODUCT
492 if (TraceMemoryWriteback) {
493 tty->print_cr("Unsafe: writeback pre-sync");
494 }
495 #endif
496 #if !defined(LINUX) || !(defined(AARCH64) || defined(AMD64))
497 // TODO - implement for solaris/AIX/BSD/WINDOWS and for 32 bit
498 JNU_ThrowRuntimeException(env, "writeback sync is not implemented");
499 return IOS_THROWN;
500 #else
501 doWriteBackSync0(false);
502 #endif
503 } UNSAFE_END
504
505 UNSAFE_LEAF(jint, Unsafe_DataCacheLineFlushSize0()) {
506 jint size = (jint)VM_Version::data_cache_line_flush_size();
507 // TODO -- ensure every CPU actually sets this
508 if (size == 0) {
509 size = (jint)DEFAULT_CACHE_LINE_SIZE;
510 }
511 return size;
512 } UNSAFE_END
513
514 ////// Random queries
515
516 UNSAFE_LEAF(jint, Unsafe_AddressSize0(JNIEnv *env, jobject unsafe)) {
517 return sizeof(void*);
518 } UNSAFE_END
519
520 UNSAFE_LEAF(jint, Unsafe_PageSize()) {
521 return os::vm_page_size();
522 } UNSAFE_END
523
524 static jlong find_field_offset(jclass clazz, jstring name, TRAPS) {
525 assert(clazz != NULL, "clazz must not be NULL");
526 assert(name != NULL, "name must not be NULL");
527
528 ResourceMark rm(THREAD);
529 char *utf_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
530
531 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz)));
532
533 jint offset = -1;
534 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
535 Symbol *name = fs.name();
536 if (name->equals(utf_name)) {
537 offset = fs.offset();
538 break;
539 }
540 }
541 if (offset < 0) {
542 THROW_0(vmSymbols::java_lang_InternalError());
543 }
544 return field_offset_from_byte_offset(offset);
545 }
546
547 static jlong find_field_offset(jobject field, int must_be_static, TRAPS) {
548 assert(field != NULL, "field must not be NULL");
549
550 oop reflected = JNIHandles::resolve_non_null(field);
551 oop mirror = java_lang_reflect_Field::clazz(reflected);
552 Klass* k = java_lang_Class::as_Klass(mirror);
553 int slot = java_lang_reflect_Field::slot(reflected);
554 int modifiers = java_lang_reflect_Field::modifiers(reflected);
555
556 if (must_be_static >= 0) {
557 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
558 if (must_be_static != really_is_static) {
559 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
560 }
561 }
562
563 int offset = InstanceKlass::cast(k)->field_offset(slot);
564 return field_offset_from_byte_offset(offset);
565 }
566
567 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset0(JNIEnv *env, jobject unsafe, jobject field)) {
568 return find_field_offset(field, 0, THREAD);
569 } UNSAFE_END
570
571 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset1(JNIEnv *env, jobject unsafe, jclass c, jstring name)) {
572 return find_field_offset(c, name, THREAD);
573 } UNSAFE_END
574
575 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset0(JNIEnv *env, jobject unsafe, jobject field)) {
576 return find_field_offset(field, 1, THREAD);
577 } UNSAFE_END
578
579 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBase0(JNIEnv *env, jobject unsafe, jobject field)) {
580 assert(field != NULL, "field must not be NULL");
581
582 // Note: In this VM implementation, a field address is always a short
583 // offset from the base of a a klass metaobject. Thus, the full dynamic
584 // range of the return type is never used. However, some implementations
585 // might put the static field inside an array shared by many classes,
586 // or even at a fixed address, in which case the address could be quite
587 // large. In that last case, this function would return NULL, since
588 // the address would operate alone, without any base pointer.
589
590 oop reflected = JNIHandles::resolve_non_null(field);
591 oop mirror = java_lang_reflect_Field::clazz(reflected);
592 int modifiers = java_lang_reflect_Field::modifiers(reflected);
593
594 if ((modifiers & JVM_ACC_STATIC) == 0) {
595 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
596 }
597
598 return JNIHandles::make_local(env, mirror);
599 } UNSAFE_END
600
601 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized0(JNIEnv *env, jobject unsafe, jobject clazz)) {
602 assert(clazz != NULL, "clazz must not be NULL");
603
604 oop mirror = JNIHandles::resolve_non_null(clazz);
605
606 Klass* klass = java_lang_Class::as_Klass(mirror);
607 if (klass != NULL && klass->should_be_initialized()) {
608 InstanceKlass* k = InstanceKlass::cast(klass);
609 k->initialize(CHECK);
610 }
611 }
612 UNSAFE_END
613
614 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized0(JNIEnv *env, jobject unsafe, jobject clazz)) {
615 assert(clazz != NULL, "clazz must not be NULL");
616
617 oop mirror = JNIHandles::resolve_non_null(clazz);
618 Klass* klass = java_lang_Class::as_Klass(mirror);
619
620 if (klass != NULL && klass->should_be_initialized()) {
621 return true;
622 }
623
624 return false;
625 }
626 UNSAFE_END
627
628 static void getBaseAndScale(int& base, int& scale, jclass clazz, TRAPS) {
629 assert(clazz != NULL, "clazz must not be NULL");
630
631 oop mirror = JNIHandles::resolve_non_null(clazz);
632 Klass* k = java_lang_Class::as_Klass(mirror);
633
634 if (k == NULL || !k->is_array_klass()) {
635 THROW(vmSymbols::java_lang_InvalidClassException());
636 } else if (k->is_objArray_klass()) {
637 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
638 scale = heapOopSize;
639 } else if (k->is_typeArray_klass()) {
640 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
641 base = tak->array_header_in_bytes();
642 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
643 scale = (1 << tak->log2_element_size());
644 } else {
645 ShouldNotReachHere();
646 }
647 }
648
649 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset0(JNIEnv *env, jobject unsafe, jclass clazz)) {
650 int base = 0, scale = 0;
651 getBaseAndScale(base, scale, clazz, CHECK_0);
652
653 return field_offset_from_byte_offset(base);
654 } UNSAFE_END
655
656
657 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale0(JNIEnv *env, jobject unsafe, jclass clazz)) {
658 int base = 0, scale = 0;
659 getBaseAndScale(base, scale, clazz, CHECK_0);
660
661 // This VM packs both fields and array elements down to the byte.
662 // But watch out: If this changes, so that array references for
663 // a given primitive type (say, T_BOOLEAN) use different memory units
664 // than fields, this method MUST return zero for such arrays.
665 // For example, the VM used to store sub-word sized fields in full
666 // words in the object layout, so that accessors like getByte(Object,int)
667 // did not really do what one might expect for arrays. Therefore,
668 // this function used to report a zero scale factor, so that the user
669 // would know not to attempt to access sub-word array elements.
670 // // Code for unpacked fields:
671 // if (scale < wordSize) return 0;
672
673 // The following allows for a pretty general fieldOffset cookie scheme,
674 // but requires it to be linear in byte offset.
675 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
676 } UNSAFE_END
677
678
679 static inline void throw_new(JNIEnv *env, const char *ename) {
680 jclass cls = env->FindClass(ename);
681 if (env->ExceptionCheck()) {
682 env->ExceptionClear();
683 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", ename);
684 return;
685 }
686
687 env->ThrowNew(cls, NULL);
688 }
689
690 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
691 // Code lifted from JDK 1.3 ClassLoader.c
692
693 jbyte *body;
694 char *utfName = NULL;
695 jclass result = 0;
696 char buf[128];
697
698 assert(data != NULL, "Class bytes must not be NULL");
699 assert(length >= 0, "length must not be negative: %d", length);
700
701 if (UsePerfData) {
702 ClassLoader::unsafe_defineClassCallCounter()->inc();
703 }
704
705 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
706 if (body == NULL) {
707 throw_new(env, "java/lang/OutOfMemoryError");
708 return 0;
709 }
710
711 env->GetByteArrayRegion(data, offset, length, body);
712 if (env->ExceptionOccurred()) {
713 goto free_body;
714 }
715
716 if (name != NULL) {
717 uint len = env->GetStringUTFLength(name);
718 int unicode_len = env->GetStringLength(name);
719
720 if (len >= sizeof(buf)) {
721 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
722 if (utfName == NULL) {
723 throw_new(env, "java/lang/OutOfMemoryError");
724 goto free_body;
725 }
726 } else {
727 utfName = buf;
728 }
729
730 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
731
732 for (uint i = 0; i < len; i++) {
733 if (utfName[i] == '.') utfName[i] = '/';
734 }
735 }
736
737 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
738
739 if (utfName && utfName != buf) {
740 FREE_C_HEAP_ARRAY(char, utfName);
741 }
742
743 free_body:
744 FREE_C_HEAP_ARRAY(jbyte, body);
745 return result;
746 }
747
748
749 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd)) {
750 ThreadToNativeFromVM ttnfv(thread);
751
752 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
753 } UNSAFE_END
754
755
756 // define a class but do not make it known to the class loader or system dictionary
757 // - host_class: supplies context for linkage, access control, protection domain, and class loader
758 // if host_class is itself anonymous then it is replaced with its host class.
759 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
760 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
761
762 // When you load an anonymous class U, it works as if you changed its name just before loading,
763 // to a name that you will never use again. Since the name is lost, no other class can directly
764 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
765 // through java.lang.Class methods like Class.newInstance.
766
767 // The package of an anonymous class must either match its host's class's package or be in the
768 // unnamed package. If it is in the unnamed package then it will be put in its host class's
769 // package.
770 //
771
772 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
773 // An anonymous class also has special privileges to access any member of its host class.
774 // This is the main reason why this loading operation is unsafe. The purpose of this is to
775 // allow language implementations to simulate "open classes"; a host class in effect gets
776 // new code when an anonymous class is loaded alongside it. A less convenient but more
777 // standard way to do this is with reflection, which can also be set to ignore access
778 // restrictions.
779
780 // Access into an anonymous class is possible only through reflection. Therefore, there
781 // are no special access rules for calling into an anonymous class. The relaxed access
782 // rule for the host class is applied in the opposite direction: A host class reflectively
783 // access one of its anonymous classes.
784
785 // If you load the same bytecodes twice, you get two different classes. You can reload
786 // the same bytecodes with or without varying CP patches.
787
788 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
789 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
790 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
791
792 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
793 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
794 // It is not possible for a named class, or an older anonymous class, to refer by
795 // name (via its CP) to a newer anonymous class.
796
797 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
798 // or type descriptors used in the loaded anonymous class.
799
800 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
801 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
802 // be changed to println(greeting), where greeting is an arbitrary object created before
803 // the anonymous class is loaded. This is useful in dynamic languages, in which
804 // various kinds of metaobjects must be introduced as constants into bytecode.
805 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
806 // not just a literal string. For such ldc instructions, the verifier uses the
807 // type Object instead of String, if the loaded constant is not in fact a String.
808
809 static InstanceKlass*
810 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
811 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
812 u1** temp_alloc,
813 TRAPS) {
814 assert(host_class != NULL, "host_class must not be NULL");
815 assert(data != NULL, "data must not be NULL");
816
817 if (UsePerfData) {
818 ClassLoader::unsafe_defineClassCallCounter()->inc();
819 }
820
821 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
822 assert(length >= 0, "class_bytes_length must not be negative: %d", length);
823
824 int class_bytes_length = (int) length;
825
826 u1* class_bytes = NEW_C_HEAP_ARRAY(u1, length, mtInternal);
827 if (class_bytes == NULL) {
828 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
829 }
830
831 // caller responsible to free it:
832 *temp_alloc = class_bytes;
833
834 ArrayAccess<>::arraycopy_to_native(arrayOop(JNIHandles::resolve_non_null(data)), typeArrayOopDesc::element_offset<jbyte>(0),
835 reinterpret_cast<jbyte*>(class_bytes), length);
836
837 objArrayHandle cp_patches_h;
838 if (cp_patches_jh != NULL) {
839 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
840 assert(p->is_objArray(), "cp_patches must be an object[]");
841 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
842 }
843
844 const Klass* host_klass = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class));
845
846 // Make sure it's the real host class, not another anonymous class.
847 while (host_klass != NULL && host_klass->is_instance_klass() &&
848 InstanceKlass::cast(host_klass)->is_anonymous()) {
849 host_klass = InstanceKlass::cast(host_klass)->host_klass();
850 }
851
852 // Primitive types have NULL Klass* fields in their java.lang.Class instances.
853 if (host_klass == NULL) {
854 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Host class is null");
855 }
856
857 assert(host_klass->is_instance_klass(), "Host class must be an instance class");
858
859 const char* host_source = host_klass->external_name();
860 Handle host_loader(THREAD, host_klass->class_loader());
861 Handle host_domain(THREAD, host_klass->protection_domain());
862
863 GrowableArray<Handle>* cp_patches = NULL;
864
865 if (cp_patches_h.not_null()) {
866 int alen = cp_patches_h->length();
867
868 for (int i = alen-1; i >= 0; i--) {
869 oop p = cp_patches_h->obj_at(i);
870 if (p != NULL) {
871 Handle patch(THREAD, p);
872
873 if (cp_patches == NULL) {
874 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
875 }
876
877 cp_patches->at_put(i, patch);
878 }
879 }
880 }
881
882 ClassFileStream st(class_bytes, class_bytes_length, host_source, ClassFileStream::verify);
883
884 Symbol* no_class_name = NULL;
885 Klass* anonk = SystemDictionary::parse_stream(no_class_name,
886 host_loader,
887 host_domain,
888 &st,
889 InstanceKlass::cast(host_klass),
890 cp_patches,
891 CHECK_NULL);
892 if (anonk == NULL) {
893 return NULL;
894 }
895
896 return InstanceKlass::cast(anonk);
897 }
898
899 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass0(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh)) {
900 ResourceMark rm(THREAD);
901
902 jobject res_jh = NULL;
903 u1* temp_alloc = NULL;
904
905 InstanceKlass* anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data, cp_patches_jh, &temp_alloc, THREAD);
906 if (anon_klass != NULL) {
907 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
908 }
909
910 // try/finally clause:
911 if (temp_alloc != NULL) {
912 FREE_C_HEAP_ARRAY(u1, temp_alloc);
913 }
914
915 // The anonymous class loader data has been artificially been kept alive to
916 // this point. The mirror and any instances of this class have to keep
917 // it alive afterwards.
918 if (anon_klass != NULL) {
919 anon_klass->class_loader_data()->dec_keep_alive();
920 }
921
922 // let caller initialize it as needed...
923
924 return (jclass) res_jh;
925 } UNSAFE_END
926
927
928
929 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr)) {
930 ThreadToNativeFromVM ttnfv(thread);
931 env->Throw(thr);
932 } UNSAFE_END
933
934 // JSR166 ------------------------------------------------------------------
935
936 UNSAFE_ENTRY(jobject, Unsafe_CompareAndExchangeObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h)) {
937 oop x = JNIHandles::resolve(x_h);
938 oop e = JNIHandles::resolve(e_h);
939 oop p = JNIHandles::resolve(obj);
940 assert_field_offset_sane(p, offset);
941 oop res = HeapAccess<ON_UNKNOWN_OOP_REF>::oop_atomic_cmpxchg_at(x, p, (ptrdiff_t)offset, e);
942 return JNIHandles::make_local(env, res);
943 } UNSAFE_END
944
945 UNSAFE_ENTRY(jint, Unsafe_CompareAndExchangeInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x)) {
946 oop p = JNIHandles::resolve(obj);
947 if (p == NULL) {
948 volatile jint* addr = (volatile jint*)index_oop_from_field_offset_long(p, offset);
949 return RawAccess<>::atomic_cmpxchg(x, addr, e);
950 } else {
951 assert_field_offset_sane(p, offset);
952 return HeapAccess<>::atomic_cmpxchg_at(x, p, (ptrdiff_t)offset, e);
953 }
954 } UNSAFE_END
955
956 UNSAFE_ENTRY(jlong, Unsafe_CompareAndExchangeLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x)) {
957 oop p = JNIHandles::resolve(obj);
958 if (p == NULL) {
959 volatile jlong* addr = (volatile jlong*)index_oop_from_field_offset_long(p, offset);
960 return RawAccess<>::atomic_cmpxchg(x, addr, e);
961 } else {
962 assert_field_offset_sane(p, offset);
963 return HeapAccess<>::atomic_cmpxchg_at(x, p, (ptrdiff_t)offset, e);
964 }
965 } UNSAFE_END
966
967 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h)) {
968 oop x = JNIHandles::resolve(x_h);
969 oop e = JNIHandles::resolve(e_h);
970 oop p = JNIHandles::resolve(obj);
971 assert_field_offset_sane(p, offset);
972 oop ret = HeapAccess<ON_UNKNOWN_OOP_REF>::oop_atomic_cmpxchg_at(x, p, (ptrdiff_t)offset, e);
973 return oopDesc::equals(ret, e);
974 } UNSAFE_END
975
976 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSetInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x)) {
977 oop p = JNIHandles::resolve(obj);
978 if (p == NULL) {
979 volatile jint* addr = (volatile jint*)index_oop_from_field_offset_long(p, offset);
980 return RawAccess<>::atomic_cmpxchg(x, addr, e) == e;
981 } else {
982 assert_field_offset_sane(p, offset);
983 return HeapAccess<>::atomic_cmpxchg_at(x, p, (ptrdiff_t)offset, e) == e;
984 }
985 } UNSAFE_END
986
987 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSetLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x)) {
988 oop p = JNIHandles::resolve(obj);
989 if (p == NULL) {
990 volatile jlong* addr = (volatile jlong*)index_oop_from_field_offset_long(p, offset);
991 return RawAccess<>::atomic_cmpxchg(x, addr, e) == e;
992 } else {
993 assert_field_offset_sane(p, offset);
994 return HeapAccess<>::atomic_cmpxchg_at(x, p, (ptrdiff_t)offset, e) == e;
995 }
996 } UNSAFE_END
997
998 static void post_thread_park_event(EventThreadPark* event, const oop obj, jlong timeout) {
999 assert(event != NULL, "invariant");
1000 assert(event->should_commit(), "invariant");
1001 event->set_parkedClass((obj != NULL) ? obj->klass() : NULL);
1002 event->set_timeout(timeout);
1003 event->set_address((obj != NULL) ? (u8)cast_from_oop<uintptr_t>(obj) : 0);
1004 event->commit();
1005 }
1006
1007 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time)) {
1008 HOTSPOT_THREAD_PARK_BEGIN((uintptr_t) thread->parker(), (int) isAbsolute, time);
1009 EventThreadPark event;
1010
1011 JavaThreadParkedState jtps(thread, time != 0);
1012 thread->parker()->park(isAbsolute != 0, time);
1013 if (event.should_commit()) {
1014 post_thread_park_event(&event, thread->current_park_blocker(), time);
1015 }
1016 HOTSPOT_THREAD_PARK_END((uintptr_t) thread->parker());
1017 } UNSAFE_END
1018
1019 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread)) {
1020 Parker* p = NULL;
1021
1022 if (jthread != NULL) {
1023 ThreadsListHandle tlh;
1024 JavaThread* thr = NULL;
1025 oop java_thread = NULL;
1026 (void) tlh.cv_internal_thread_to_JavaThread(jthread, &thr, &java_thread);
1027 if (java_thread != NULL) {
1028 // This is a valid oop.
1029 jlong lp = java_lang_Thread::park_event(java_thread);
1030 if (lp != 0) {
1031 // This cast is OK even though the jlong might have been read
1032 // non-atomically on 32bit systems, since there, one word will
1033 // always be zero anyway and the value set is always the same
1034 p = (Parker*)addr_from_java(lp);
1035 } else {
1036 // Not cached in the java.lang.Thread oop yet (could be an
1037 // older version of library).
1038 if (thr != NULL) {
1039 // The JavaThread is alive.
1040 p = thr->parker();
1041 if (p != NULL) {
1042 // Cache the Parker in the java.lang.Thread oop for next time.
1043 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1044 }
1045 }
1046 }
1047 }
1048 } // ThreadsListHandle is destroyed here.
1049
1050 if (p != NULL) {
1051 HOTSPOT_THREAD_UNPARK((uintptr_t) p);
1052 p->unpark();
1053 }
1054 } UNSAFE_END
1055
1056 UNSAFE_ENTRY(jint, Unsafe_GetLoadAverage0(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem)) {
1057 const int max_nelem = 3;
1058 double la[max_nelem];
1059 jint ret;
1060
1061 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1062 assert(a->is_typeArray(), "must be type array");
1063
1064 ret = os::loadavg(la, nelem);
1065 if (ret == -1) {
1066 return -1;
1067 }
1068
1069 // if successful, ret is the number of samples actually retrieved.
1070 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1071 switch(ret) {
1072 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1073 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1074 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1075 }
1076
1077 return ret;
1078 } UNSAFE_END
1079
1080
1081 /// JVM_RegisterUnsafeMethods
1082
1083 #define ADR "J"
1084
1085 #define LANG "Ljava/lang/"
1086
1087 #define OBJ LANG "Object;"
1088 #define CLS LANG "Class;"
1089 #define FLD LANG "reflect/Field;"
1090 #define THR LANG "Throwable;"
1091
1092 #define DC_Args LANG "String;[BII" LANG "ClassLoader;" "Ljava/security/ProtectionDomain;"
1093 #define DAC_Args CLS "[B[" OBJ
1094
1095 #define CC (char*) /*cast a literal from (const char*)*/
1096 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1097
1098 #define DECLARE_GETPUTOOP(Type, Desc) \
1099 {CC "get" #Type, CC "(" OBJ "J)" #Desc, FN_PTR(Unsafe_Get##Type)}, \
1100 {CC "put" #Type, CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Put##Type)}, \
1101 {CC "get" #Type "Volatile", CC "(" OBJ "J)" #Desc, FN_PTR(Unsafe_Get##Type##Volatile)}, \
1102 {CC "put" #Type "Volatile", CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Put##Type##Volatile)}
1103
1104
1105 static JNINativeMethod jdk_internal_misc_Unsafe_methods[] = {
1106 {CC "getObject", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObject)},
1107 {CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_PutObject)},
1108 {CC "getObjectVolatile",CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObjectVolatile)},
1109 {CC "putObjectVolatile",CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_PutObjectVolatile)},
1110
1111 {CC "getUncompressedObject", CC "(" ADR ")" OBJ, FN_PTR(Unsafe_GetUncompressedObject)},
1112
1113 DECLARE_GETPUTOOP(Boolean, Z),
1114 DECLARE_GETPUTOOP(Byte, B),
1115 DECLARE_GETPUTOOP(Short, S),
1116 DECLARE_GETPUTOOP(Char, C),
1117 DECLARE_GETPUTOOP(Int, I),
1118 DECLARE_GETPUTOOP(Long, J),
1119 DECLARE_GETPUTOOP(Float, F),
1120 DECLARE_GETPUTOOP(Double, D),
1121
1122 {CC "allocateMemory0", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory0)},
1123 {CC "reallocateMemory0", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory0)},
1124 {CC "freeMemory0", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory0)},
1125
1126 {CC "objectFieldOffset0", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset0)},
1127 {CC "objectFieldOffset1", CC "(" CLS LANG "String;)J", FN_PTR(Unsafe_ObjectFieldOffset1)},
1128 {CC "staticFieldOffset0", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset0)},
1129 {CC "staticFieldBase0", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBase0)},
1130 {CC "ensureClassInitialized0", CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized0)},
1131 {CC "arrayBaseOffset0", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset0)},
1132 {CC "arrayIndexScale0", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale0)},
1133 {CC "dataCacheLineFlushSize0", CC "()I", FN_PTR(Unsafe_DataCacheLineFlushSize0)},
1134 {CC "addressSize0", CC "()I", FN_PTR(Unsafe_AddressSize0)},
1135 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1136
1137 {CC "defineClass0", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)},
1138 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1139 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)},
1140 {CC "compareAndSetObject",CC "(" OBJ "J" OBJ "" OBJ ")Z", FN_PTR(Unsafe_CompareAndSetObject)},
1141 {CC "compareAndSetInt", CC "(" OBJ "J""I""I"")Z", FN_PTR(Unsafe_CompareAndSetInt)},
1142 {CC "compareAndSetLong", CC "(" OBJ "J""J""J"")Z", FN_PTR(Unsafe_CompareAndSetLong)},
1143 {CC "compareAndExchangeObject", CC "(" OBJ "J" OBJ "" OBJ ")" OBJ, FN_PTR(Unsafe_CompareAndExchangeObject)},
1144 {CC "compareAndExchangeInt", CC "(" OBJ "J""I""I"")I", FN_PTR(Unsafe_CompareAndExchangeInt)},
1145 {CC "compareAndExchangeLong", CC "(" OBJ "J""J""J"")J", FN_PTR(Unsafe_CompareAndExchangeLong)},
1146
1147 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)},
1148 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)},
1149
1150 {CC "getLoadAverage0", CC "([DI)I", FN_PTR(Unsafe_GetLoadAverage0)},
1151
1152 {CC "copyMemory0", CC "(" OBJ "J" OBJ "JJ)V", FN_PTR(Unsafe_CopyMemory0)},
1153 {CC "copySwapMemory0", CC "(" OBJ "J" OBJ "JJJ)V", FN_PTR(Unsafe_CopySwapMemory0)},
1154 {CC "writeback0", CC "(" "J" ")V", FN_PTR(Unsafe_WriteBack0)},
1155 {CC "writebackPreSync0", CC "()V", FN_PTR(Unsafe_WriteBackPreSync0)},
1156 {CC "writebackPostSync0", CC "()V", FN_PTR(Unsafe_WriteBackPostSync0)},
1157 {CC "setMemory0", CC "(" OBJ "JJB)V", FN_PTR(Unsafe_SetMemory0)},
1158
1159 {CC "defineAnonymousClass0", CC "(" DAC_Args ")" CLS, FN_PTR(Unsafe_DefineAnonymousClass0)},
1160
1161 {CC "shouldBeInitialized0", CC "(" CLS ")Z", FN_PTR(Unsafe_ShouldBeInitialized0)},
1162
1163 {CC "loadFence", CC "()V", FN_PTR(Unsafe_LoadFence)},
1164 {CC "storeFence", CC "()V", FN_PTR(Unsafe_StoreFence)},
1165 {CC "fullFence", CC "()V", FN_PTR(Unsafe_FullFence)},
1166
1167 {CC "isBigEndian0", CC "()Z", FN_PTR(Unsafe_isBigEndian0)},
1168 {CC "unalignedAccess0", CC "()Z", FN_PTR(Unsafe_unalignedAccess0)}
1169 };
1170
1171 #undef CC
1172 #undef FN_PTR
1173
1174 #undef ADR
1175 #undef LANG
1176 #undef OBJ
1177 #undef CLS
1178 #undef FLD
1179 #undef THR
1180 #undef DC_Args
1181 #undef DAC_Args
1182
1183 #undef DECLARE_GETPUTOOP
1184
1185
1186 // This function is exported, used by NativeLookup.
1187 // The Unsafe_xxx functions above are called only from the interpreter.
1188 // The optimizer looks at names and signatures to recognize
1189 // individual functions.
1190
1191 JVM_ENTRY(void, JVM_RegisterJDKInternalMiscUnsafeMethods(JNIEnv *env, jclass unsafeclass)) {
1192 ThreadToNativeFromVM ttnfv(thread);
1193
1194 int ok = env->RegisterNatives(unsafeclass, jdk_internal_misc_Unsafe_methods, sizeof(jdk_internal_misc_Unsafe_methods)/sizeof(JNINativeMethod));
1195 guarantee(ok == 0, "register jdk.internal.misc.Unsafe natives");
1196 } JVM_END