1 /*
2 * Copyright (c) 2000, 2008, 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 /*
26 * Implementation of class sun.misc.Unsafe
27 */
28
29 #include "incls/_precompiled.incl"
30 #include "incls/_unsafe.cpp.incl"
31
32 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long);
33 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t);
34 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t);
35
36 #define MAX_OBJECT_SIZE \
37 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
38 + ((julong)max_jint * sizeof(double)) )
39
40
41 #define UNSAFE_ENTRY(result_type, header) \
42 JVM_ENTRY(result_type, header)
43
44 // Can't use UNSAFE_LEAF because it has the signature of a straight
45 // call into the runtime (just like JVM_LEAF, funny that) but it's
46 // called like a Java Native and thus the wrapper built for it passes
47 // arguments like a JNI call. It expects those arguments to be popped
48 // from the stack on Intel like all good JNI args are, and adjusts the
49 // stack according. Since the JVM_LEAF call expects no extra
50 // arguments the stack isn't popped in the C code, is pushed by the
51 // wrapper and we get sick.
52 //#define UNSAFE_LEAF(result_type, header) \
53 // JVM_LEAF(result_type, header)
54
55 #define UNSAFE_END JVM_END
56
57 #define UnsafeWrapper(arg) /*nothing, for the present*/
58
59
60 inline void* addr_from_java(jlong addr) {
61 // This assert fails in a variety of ways on 32-bit systems.
62 // It is impossible to predict whether native code that converts
63 // pointers to longs will sign-extend or zero-extend the addresses.
64 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
65 return (void*)(uintptr_t)addr;
66 }
67
68 inline jlong addr_to_java(void* p) {
69 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
70 return (uintptr_t)p;
71 }
72
73
74 // Note: The VM's obj_field and related accessors use byte-scaled
75 // ("unscaled") offsets, just as the unsafe methods do.
76
77 // However, the method Unsafe.fieldOffset explicitly declines to
78 // guarantee this. The field offset values manipulated by the Java user
79 // through the Unsafe API are opaque cookies that just happen to be byte
80 // offsets. We represent this state of affairs by passing the cookies
81 // through conversion functions when going between the VM and the Unsafe API.
82 // The conversion functions just happen to be no-ops at present.
83
84 inline jlong field_offset_to_byte_offset(jlong field_offset) {
85 return field_offset;
86 }
87
88 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
89 return byte_offset;
90 }
91
92 inline jint invocation_key_from_method_slot(jint slot) {
93 return slot;
94 }
95
96 inline jint invocation_key_to_method_slot(jint key) {
97 return key;
98 }
99
100 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
101 jlong byte_offset = field_offset_to_byte_offset(field_offset);
102 #ifdef ASSERT
103 if (p != NULL) {
104 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
105 if (byte_offset == (jint)byte_offset) {
106 void* ptr_plus_disp = (address)p + byte_offset;
107 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
108 "raw [ptr+disp] must be consistent with oop::field_base");
109 }
110 }
111 #endif
112 if (sizeof(char*) == sizeof(jint)) // (this constant folds!)
113 return (address)p + (jint) byte_offset;
114 else
115 return (address)p + byte_offset;
116 }
117
118 // Externally callable versions:
119 // (Use these in compiler intrinsics which emulate unsafe primitives.)
120 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
121 return field_offset;
122 }
123 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
124 return byte_offset;
125 }
126 jint Unsafe_invocation_key_from_method_slot(jint slot) {
127 return invocation_key_from_method_slot(slot);
128 }
129 jint Unsafe_invocation_key_to_method_slot(jint key) {
130 return invocation_key_to_method_slot(key);
131 }
132
133
134 ///// Data in the Java heap.
135
136 #define GET_FIELD(obj, offset, type_name, v) \
137 oop p = JNIHandles::resolve(obj); \
138 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
139
140 #define SET_FIELD(obj, offset, type_name, x) \
141 oop p = JNIHandles::resolve(obj); \
142 *(type_name*)index_oop_from_field_offset_long(p, offset) = x
143
144 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
145 oop p = JNIHandles::resolve(obj); \
146 volatile type_name v = *(volatile type_name*)index_oop_from_field_offset_long(p, offset)
147
148 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
149 oop p = JNIHandles::resolve(obj); \
150 *(volatile type_name*)index_oop_from_field_offset_long(p, offset) = x; \
151 OrderAccess::fence();
152
153 // Macros for oops that check UseCompressedOops
154
155 #define GET_OOP_FIELD(obj, offset, v) \
156 oop p = JNIHandles::resolve(obj); \
157 oop v; \
158 if (UseCompressedOops) { \
159 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
160 v = oopDesc::decode_heap_oop(n); \
161 } else { \
162 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
163 }
164
165 #define GET_OOP_FIELD_VOLATILE(obj, offset, v) \
166 oop p = JNIHandles::resolve(obj); \
167 volatile oop v; \
168 if (UseCompressedOops) { \
169 volatile narrowOop n = *(volatile narrowOop*)index_oop_from_field_offset_long(p, offset); \
170 v = oopDesc::decode_heap_oop(n); \
171 } else { \
172 v = *(volatile oop*)index_oop_from_field_offset_long(p, offset); \
173 }
174
175
176 // Get/SetObject must be special-cased, since it works with handles.
177
178 // The xxx140 variants for backward compatibility do not allow a full-width offset.
179 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
180 UnsafeWrapper("Unsafe_GetObject");
181 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
182 GET_OOP_FIELD(obj, offset, v)
183 return JNIHandles::make_local(env, v);
184 UNSAFE_END
185
186 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
187 UnsafeWrapper("Unsafe_SetObject");
188 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
189 oop x = JNIHandles::resolve(x_h);
190 //SET_FIELD(obj, offset, oop, x);
191 oop p = JNIHandles::resolve(obj);
192 if (UseCompressedOops) {
193 if (x != NULL) {
194 // If there is a heap base pointer, we are obliged to emit a store barrier.
195 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
196 } else {
197 narrowOop n = oopDesc::encode_heap_oop_not_null(x);
198 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
199 }
200 } else {
201 if (x != NULL) {
202 // If there is a heap base pointer, we are obliged to emit a store barrier.
203 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
204 } else {
205 *(oop*)index_oop_from_field_offset_long(p, offset) = x;
206 }
207 }
208 UNSAFE_END
209
210 // The normal variants allow a null base pointer with an arbitrary address.
211 // But if the base pointer is non-null, the offset should make some sense.
212 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
213 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
214 UnsafeWrapper("Unsafe_GetObject");
215 GET_OOP_FIELD(obj, offset, v)
216 return JNIHandles::make_local(env, v);
217 UNSAFE_END
218
219 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
220 UnsafeWrapper("Unsafe_SetObject");
221 oop x = JNIHandles::resolve(x_h);
222 oop p = JNIHandles::resolve(obj);
223 if (UseCompressedOops) {
224 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
225 } else {
226 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
227 }
228 UNSAFE_END
229
230 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
231 UnsafeWrapper("Unsafe_GetObjectVolatile");
232 GET_OOP_FIELD_VOLATILE(obj, offset, v)
233 return JNIHandles::make_local(env, v);
234 UNSAFE_END
235
236 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
237 UnsafeWrapper("Unsafe_SetObjectVolatile");
238 oop x = JNIHandles::resolve(x_h);
239 oop p = JNIHandles::resolve(obj);
240 if (UseCompressedOops) {
241 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
242 } else {
243 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
244 }
245 OrderAccess::fence();
246 UNSAFE_END
247
248 // Volatile long versions must use locks if !VM_Version::supports_cx8().
249 // support_cx8 is a surrogate for 'supports atomic long memory ops'.
250
251 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
252 UnsafeWrapper("Unsafe_GetLongVolatile");
253 {
254 if (VM_Version::supports_cx8()) {
255 GET_FIELD_VOLATILE(obj, offset, jlong, v);
256 return v;
257 }
258 else {
259 Handle p (THREAD, JNIHandles::resolve(obj));
260 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
261 ObjectLocker ol(p, THREAD);
262 jlong value = *addr;
263 return value;
264 }
265 }
266 UNSAFE_END
267
268 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
269 UnsafeWrapper("Unsafe_SetLongVolatile");
270 {
271 if (VM_Version::supports_cx8()) {
272 SET_FIELD_VOLATILE(obj, offset, jlong, x);
273 }
274 else {
275 Handle p (THREAD, JNIHandles::resolve(obj));
276 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
277 ObjectLocker ol(p, THREAD);
278 *addr = x;
279 }
280 }
281 UNSAFE_END
282
283
284 #define DEFINE_GETSETOOP(jboolean, Boolean) \
285 \
286 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
287 UnsafeWrapper("Unsafe_Get"#Boolean); \
288 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
289 GET_FIELD(obj, offset, jboolean, v); \
290 return v; \
291 UNSAFE_END \
292 \
293 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
294 UnsafeWrapper("Unsafe_Set"#Boolean); \
295 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
296 SET_FIELD(obj, offset, jboolean, x); \
297 UNSAFE_END \
298 \
299 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
300 UnsafeWrapper("Unsafe_Get"#Boolean); \
301 GET_FIELD(obj, offset, jboolean, v); \
302 return v; \
303 UNSAFE_END \
304 \
305 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
306 UnsafeWrapper("Unsafe_Set"#Boolean); \
307 SET_FIELD(obj, offset, jboolean, x); \
308 UNSAFE_END \
309 \
310 // END DEFINE_GETSETOOP.
311
312
313 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
314 \
315 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
316 UnsafeWrapper("Unsafe_Get"#Boolean); \
317 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
318 return v; \
319 UNSAFE_END \
320 \
321 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
322 UnsafeWrapper("Unsafe_Set"#Boolean); \
323 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
324 UNSAFE_END \
325 \
326 // END DEFINE_GETSETOOP_VOLATILE.
327
328 DEFINE_GETSETOOP(jboolean, Boolean)
329 DEFINE_GETSETOOP(jbyte, Byte)
330 DEFINE_GETSETOOP(jshort, Short);
331 DEFINE_GETSETOOP(jchar, Char);
332 DEFINE_GETSETOOP(jint, Int);
333 DEFINE_GETSETOOP(jlong, Long);
334 DEFINE_GETSETOOP(jfloat, Float);
335 DEFINE_GETSETOOP(jdouble, Double);
336
337 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
338 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
339 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
340 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
341 DEFINE_GETSETOOP_VOLATILE(jint, Int);
342 // no long -- handled specially
343 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
344 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
345
346 #undef DEFINE_GETSETOOP
347
348 // The non-intrinsified versions of setOrdered just use setVolatile
349
350 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x)) \
351 UnsafeWrapper("Unsafe_SetOrderedInt"); \
352 SET_FIELD_VOLATILE(obj, offset, jint, x); \
353 UNSAFE_END
354
355 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
356 UnsafeWrapper("Unsafe_SetOrderedObject");
357 oop x = JNIHandles::resolve(x_h);
358 oop p = JNIHandles::resolve(obj);
359 if (UseCompressedOops) {
360 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
361 } else {
362 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
363 }
364 OrderAccess::fence();
365 UNSAFE_END
366
367 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
368 UnsafeWrapper("Unsafe_SetOrderedLong");
369 {
370 if (VM_Version::supports_cx8()) {
371 SET_FIELD_VOLATILE(obj, offset, jlong, x);
372 }
373 else {
374 Handle p (THREAD, JNIHandles::resolve(obj));
375 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
376 ObjectLocker ol(p, THREAD);
377 *addr = x;
378 }
379 }
380 UNSAFE_END
381
382 ////// Data in the C heap.
383
384 // Note: These do not throw NullPointerException for bad pointers.
385 // They just crash. Only a oop base pointer can generate a NullPointerException.
386 //
387 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
388 \
389 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
390 UnsafeWrapper("Unsafe_GetNative"#Type); \
391 void* p = addr_from_java(addr); \
392 JavaThread* t = JavaThread::current(); \
393 t->set_doing_unsafe_access(true); \
394 java_type x = *(volatile native_type*)p; \
395 t->set_doing_unsafe_access(false); \
396 return x; \
397 UNSAFE_END \
398 \
399 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
400 UnsafeWrapper("Unsafe_SetNative"#Type); \
401 JavaThread* t = JavaThread::current(); \
402 t->set_doing_unsafe_access(true); \
403 void* p = addr_from_java(addr); \
404 *(volatile native_type*)p = x; \
405 t->set_doing_unsafe_access(false); \
406 UNSAFE_END \
407 \
408 // END DEFINE_GETSETNATIVE.
409
410 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
411 DEFINE_GETSETNATIVE(jshort, Short, signed short);
412 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
413 DEFINE_GETSETNATIVE(jint, Int, jint);
414 // no long -- handled specially
415 DEFINE_GETSETNATIVE(jfloat, Float, float);
416 DEFINE_GETSETNATIVE(jdouble, Double, double);
417
418 #undef DEFINE_GETSETNATIVE
419
420 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
421 UnsafeWrapper("Unsafe_GetNativeLong");
422 JavaThread* t = JavaThread::current();
423 // We do it this way to avoid problems with access to heap using 64
424 // bit loads, as jlong in heap could be not 64-bit aligned, and on
425 // some CPUs (SPARC) it leads to SIGBUS.
426 t->set_doing_unsafe_access(true);
427 void* p = addr_from_java(addr);
428 jlong x;
429 if (((intptr_t)p & 7) == 0) {
430 // jlong is aligned, do a volatile access
431 x = *(volatile jlong*)p;
432 } else {
433 jlong_accessor acc;
434 acc.words[0] = ((volatile jint*)p)[0];
435 acc.words[1] = ((volatile jint*)p)[1];
436 x = acc.long_value;
437 }
438 t->set_doing_unsafe_access(false);
439 return x;
440 UNSAFE_END
441
442 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
443 UnsafeWrapper("Unsafe_SetNativeLong");
444 JavaThread* t = JavaThread::current();
445 // see comment for Unsafe_GetNativeLong
446 t->set_doing_unsafe_access(true);
447 void* p = addr_from_java(addr);
448 if (((intptr_t)p & 7) == 0) {
449 // jlong is aligned, do a volatile access
450 *(volatile jlong*)p = x;
451 } else {
452 jlong_accessor acc;
453 acc.long_value = x;
454 ((volatile jint*)p)[0] = acc.words[0];
455 ((volatile jint*)p)[1] = acc.words[1];
456 }
457 t->set_doing_unsafe_access(false);
458 UNSAFE_END
459
460
461 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
462 UnsafeWrapper("Unsafe_GetNativeAddress");
463 void* p = addr_from_java(addr);
464 return addr_to_java(*(void**)p);
465 UNSAFE_END
466
467 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
468 UnsafeWrapper("Unsafe_SetNativeAddress");
469 void* p = addr_from_java(addr);
470 *(void**)p = addr_from_java(x);
471 UNSAFE_END
472
473
474 ////// Allocation requests
475
476 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
477 UnsafeWrapper("Unsafe_AllocateInstance");
478 {
479 ThreadToNativeFromVM ttnfv(thread);
480 return env->AllocObject(cls);
481 }
482 UNSAFE_END
483
484 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
485 UnsafeWrapper("Unsafe_AllocateMemory");
486 size_t sz = (size_t)size;
487 if (sz != (julong)size || size < 0) {
488 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
489 }
490 if (sz == 0) {
491 return 0;
492 }
493 sz = round_to(sz, HeapWordSize);
494 void* x = os::malloc(sz);
495 if (x == NULL) {
496 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
497 }
498 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
499 return addr_to_java(x);
500 UNSAFE_END
501
502 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
503 UnsafeWrapper("Unsafe_ReallocateMemory");
504 void* p = addr_from_java(addr);
505 size_t sz = (size_t)size;
506 if (sz != (julong)size || size < 0) {
507 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
508 }
509 if (sz == 0) {
510 os::free(p);
511 return 0;
512 }
513 sz = round_to(sz, HeapWordSize);
514 void* x = (p == NULL) ? os::malloc(sz) : os::realloc(p, sz);
515 if (x == NULL) {
516 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
517 }
518 return addr_to_java(x);
519 UNSAFE_END
520
521 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
522 UnsafeWrapper("Unsafe_FreeMemory");
523 void* p = addr_from_java(addr);
524 if (p == NULL) {
525 return;
526 }
527 os::free(p);
528 UNSAFE_END
529
530 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
531 UnsafeWrapper("Unsafe_SetMemory");
532 size_t sz = (size_t)size;
533 if (sz != (julong)size || size < 0) {
534 THROW(vmSymbols::java_lang_IllegalArgumentException());
535 }
536 char* p = (char*) addr_from_java(addr);
537 Copy::fill_to_memory_atomic(p, sz, value);
538 UNSAFE_END
539
540 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
541 UnsafeWrapper("Unsafe_SetMemory");
542 size_t sz = (size_t)size;
543 if (sz != (julong)size || size < 0) {
544 THROW(vmSymbols::java_lang_IllegalArgumentException());
545 }
546 oop base = JNIHandles::resolve(obj);
547 void* p = index_oop_from_field_offset_long(base, offset);
548 Copy::fill_to_memory_atomic(p, sz, value);
549 UNSAFE_END
550
551 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
552 UnsafeWrapper("Unsafe_CopyMemory");
553 if (size == 0) {
554 return;
555 }
556 size_t sz = (size_t)size;
557 if (sz != (julong)size || size < 0) {
558 THROW(vmSymbols::java_lang_IllegalArgumentException());
559 }
560 void* src = addr_from_java(srcAddr);
561 void* dst = addr_from_java(dstAddr);
562 Copy::conjoint_memory_atomic(src, dst, sz);
563 UNSAFE_END
564
565 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
566 UnsafeWrapper("Unsafe_CopyMemory");
567 if (size == 0) {
568 return;
569 }
570 size_t sz = (size_t)size;
571 if (sz != (julong)size || size < 0) {
572 THROW(vmSymbols::java_lang_IllegalArgumentException());
573 }
574 oop srcp = JNIHandles::resolve(srcObj);
575 oop dstp = JNIHandles::resolve(dstObj);
576 if (dstp != NULL && !dstp->is_typeArray()) {
577 // NYI: This works only for non-oop arrays at present.
578 // Generalizing it would be reasonable, but requires card marking.
579 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
580 THROW(vmSymbols::java_lang_IllegalArgumentException());
581 }
582 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
583 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
584 Copy::conjoint_memory_atomic(src, dst, sz);
585 UNSAFE_END
586
587
588 ////// Random queries
589
590 // See comment at file start about UNSAFE_LEAF
591 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
592 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
593 UnsafeWrapper("Unsafe_AddressSize");
594 return sizeof(void*);
595 UNSAFE_END
596
597 // See comment at file start about UNSAFE_LEAF
598 //UNSAFE_LEAF(jint, Unsafe_PageSize())
599 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
600 UnsafeWrapper("Unsafe_PageSize");
601 return os::vm_page_size();
602 UNSAFE_END
603
604 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
605 if (field == NULL) {
606 THROW_0(vmSymbols::java_lang_NullPointerException());
607 }
608
609 oop reflected = JNIHandles::resolve_non_null(field);
610 oop mirror = java_lang_reflect_Field::clazz(reflected);
611 klassOop k = java_lang_Class::as_klassOop(mirror);
612 int slot = java_lang_reflect_Field::slot(reflected);
613 int modifiers = java_lang_reflect_Field::modifiers(reflected);
614
615 if (must_be_static >= 0) {
616 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
617 if (must_be_static != really_is_static) {
618 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
619 }
620 }
621
622 int offset = instanceKlass::cast(k)->offset_from_fields(slot);
623 return field_offset_from_byte_offset(offset);
624 }
625
626 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
627 UnsafeWrapper("Unsafe_ObjectFieldOffset");
628 return find_field_offset(field, 0, THREAD);
629 UNSAFE_END
630
631 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
632 UnsafeWrapper("Unsafe_StaticFieldOffset");
633 return find_field_offset(field, 1, THREAD);
634 UNSAFE_END
635
636 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
637 UnsafeWrapper("Unsafe_StaticFieldBase");
638 // Note: In this VM implementation, a field address is always a short
639 // offset from the base of a a klass metaobject. Thus, the full dynamic
640 // range of the return type is never used. However, some implementations
641 // might put the static field inside an array shared by many classes,
642 // or even at a fixed address, in which case the address could be quite
643 // large. In that last case, this function would return NULL, since
644 // the address would operate alone, without any base pointer.
645
646 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
647
648 oop reflected = JNIHandles::resolve_non_null(field);
649 oop mirror = java_lang_reflect_Field::clazz(reflected);
650 int modifiers = java_lang_reflect_Field::modifiers(reflected);
651
652 if ((modifiers & JVM_ACC_STATIC) == 0) {
653 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
654 }
655
656 return JNIHandles::make_local(env, java_lang_Class::as_klassOop(mirror));
657 UNSAFE_END
658
659 //@deprecated
660 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
661 UnsafeWrapper("Unsafe_FieldOffset");
662 // tries (but fails) to be polymorphic between static and non-static:
663 jlong offset = find_field_offset(field, -1, THREAD);
664 guarantee(offset == (jint)offset, "offset fits in 32 bits");
665 return (jint)offset;
666 UNSAFE_END
667
668 //@deprecated
669 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
670 UnsafeWrapper("Unsafe_StaticFieldBase");
671 if (clazz == NULL) {
672 THROW_0(vmSymbols::java_lang_NullPointerException());
673 }
674 return JNIHandles::make_local(env, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
675 UNSAFE_END
676
677 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz))
678 UnsafeWrapper("Unsafe_EnsureClassInitialized");
679 if (clazz == NULL) {
680 THROW(vmSymbols::java_lang_NullPointerException());
681 }
682 oop mirror = JNIHandles::resolve_non_null(clazz);
683 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(mirror));
684 if (k != NULL) {
685 k->initialize(CHECK);
686 }
687 UNSAFE_END
688
689 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
690 if (acls == NULL) {
691 THROW(vmSymbols::java_lang_NullPointerException());
692 }
693 oop mirror = JNIHandles::resolve_non_null(acls);
694 klassOop k = java_lang_Class::as_klassOop(mirror);
695 if (k == NULL || !k->klass_part()->oop_is_array()) {
696 THROW(vmSymbols::java_lang_InvalidClassException());
697 } else if (k->klass_part()->oop_is_objArray()) {
698 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
699 scale = heapOopSize;
700 } else if (k->klass_part()->oop_is_typeArray()) {
701 typeArrayKlass* tak = typeArrayKlass::cast(k);
702 base = tak->array_header_in_bytes();
703 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
704 scale = (1 << tak->log2_element_size());
705 } else {
706 ShouldNotReachHere();
707 }
708 }
709
710 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
711 UnsafeWrapper("Unsafe_ArrayBaseOffset");
712 int base, scale;
713 getBaseAndScale(base, scale, acls, CHECK_0);
714 return field_offset_from_byte_offset(base);
715 UNSAFE_END
716
717
718 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
719 UnsafeWrapper("Unsafe_ArrayIndexScale");
720 int base, scale;
721 getBaseAndScale(base, scale, acls, CHECK_0);
722 // This VM packs both fields and array elements down to the byte.
723 // But watch out: If this changes, so that array references for
724 // a given primitive type (say, T_BOOLEAN) use different memory units
725 // than fields, this method MUST return zero for such arrays.
726 // For example, the VM used to store sub-word sized fields in full
727 // words in the object layout, so that accessors like getByte(Object,int)
728 // did not really do what one might expect for arrays. Therefore,
729 // this function used to report a zero scale factor, so that the user
730 // would know not to attempt to access sub-word array elements.
731 // // Code for unpacked fields:
732 // if (scale < wordSize) return 0;
733
734 // The following allows for a pretty general fieldOffset cookie scheme,
735 // but requires it to be linear in byte offset.
736 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
737 UNSAFE_END
738
739
740 static inline void throw_new(JNIEnv *env, const char *ename) {
741 char buf[100];
742 strcpy(buf, "java/lang/");
743 strcat(buf, ename);
744 jclass cls = env->FindClass(buf);
745 char* msg = NULL;
746 env->ThrowNew(cls, msg);
747 }
748
749 static jclass Unsafe_DefineClass(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
750 {
751 // Code lifted from JDK 1.3 ClassLoader.c
752
753 jbyte *body;
754 char *utfName;
755 jclass result = 0;
756 char buf[128];
757
758 if (UsePerfData) {
759 ClassLoader::unsafe_defineClassCallCounter()->inc();
760 }
761
762 if (data == NULL) {
763 throw_new(env, "NullPointerException");
764 return 0;
765 }
766
767 /* Work around 4153825. malloc crashes on Solaris when passed a
768 * negative size.
769 */
770 if (length < 0) {
771 throw_new(env, "ArrayIndexOutOfBoundsException");
772 return 0;
773 }
774
775 body = NEW_C_HEAP_ARRAY(jbyte, length);
776
777 if (body == 0) {
778 throw_new(env, "OutOfMemoryError");
779 return 0;
780 }
781
782 env->GetByteArrayRegion(data, offset, length, body);
783
784 if (env->ExceptionOccurred())
785 goto free_body;
786
787 if (name != NULL) {
788 uint len = env->GetStringUTFLength(name);
789 int unicode_len = env->GetStringLength(name);
790 if (len >= sizeof(buf)) {
791 utfName = NEW_C_HEAP_ARRAY(char, len + 1);
792 if (utfName == NULL) {
793 throw_new(env, "OutOfMemoryError");
794 goto free_body;
795 }
796 } else {
797 utfName = buf;
798 }
799 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
800 //VerifyFixClassname(utfName);
801 for (uint i = 0; i < len; i++) {
802 if (utfName[i] == '.') utfName[i] = '/';
803 }
804 } else {
805 utfName = NULL;
806 }
807
808 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
809
810 if (utfName && utfName != buf)
811 FREE_C_HEAP_ARRAY(char, utfName);
812
813 free_body:
814 FREE_C_HEAP_ARRAY(jbyte, body);
815 return result;
816 }
817 }
818
819
820 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
821 UnsafeWrapper("Unsafe_DefineClass");
822 {
823 ThreadToNativeFromVM ttnfv(thread);
824
825 int depthFromDefineClass0 = 1;
826 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
827 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
828 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
829
830 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
831 }
832 UNSAFE_END
833
834
835 UNSAFE_ENTRY(jclass, Unsafe_DefineClass1(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
836 UnsafeWrapper("Unsafe_DefineClass");
837 {
838 ThreadToNativeFromVM ttnfv(thread);
839
840 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
841 }
842 UNSAFE_END
843
844 #define DAC_Args CLS"[B["OBJ
845 // define a class but do not make it known to the class loader or system dictionary
846 // - host_class: supplies context for linkage, access control, protection domain, and class loader
847 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
848 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
849
850 // When you load an anonymous class U, it works as if you changed its name just before loading,
851 // to a name that you will never use again. Since the name is lost, no other class can directly
852 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
853 // through java.lang.Class methods like Class.newInstance.
854
855 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
856 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
857 // An anonymous class also has special privileges to access any member of its host class.
858 // This is the main reason why this loading operation is unsafe. The purpose of this is to
859 // allow language implementations to simulate "open classes"; a host class in effect gets
860 // new code when an anonymous class is loaded alongside it. A less convenient but more
861 // standard way to do this is with reflection, which can also be set to ignore access
862 // restrictions.
863
864 // Access into an anonymous class is possible only through reflection. Therefore, there
865 // are no special access rules for calling into an anonymous class. The relaxed access
866 // rule for the host class is applied in the opposite direction: A host class reflectively
867 // access one of its anonymous classes.
868
869 // If you load the same bytecodes twice, you get two different classes. You can reload
870 // the same bytecodes with or without varying CP patches.
871
872 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
873 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
874 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
875
876 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
877 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
878 // It is not possible for a named class, or an older anonymous class, to refer by
879 // name (via its CP) to a newer anonymous class.
880
881 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
882 // or type descriptors used in the loaded anonymous class.
883
884 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
885 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
886 // be changed to println(greeting), where greeting is an arbitrary object created before
887 // the anonymous class is loaded. This is useful in dynamic languages, in which
888 // various kinds of metaobjects must be introduced as constants into bytecode.
889 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
890 // not just a literal string. For such ldc instructions, the verifier uses the
891 // type Object instead of String, if the loaded constant is not in fact a String.
892
893 static oop
894 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
895 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
896 HeapWord* *temp_alloc,
897 TRAPS) {
898
899 if (UsePerfData) {
900 ClassLoader::unsafe_defineClassCallCounter()->inc();
901 }
902
903 if (data == NULL) {
904 THROW_0(vmSymbols::java_lang_NullPointerException());
905 }
906
907 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
908 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
909 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length);
910 if (body == NULL) {
911 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
912 }
913
914 // caller responsible to free it:
915 (*temp_alloc) = body;
916
917 {
918 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
919 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
920 }
921
922 u1* class_bytes = (u1*) body;
923 int class_bytes_length = (int) length;
924 if (class_bytes_length < 0) class_bytes_length = 0;
925 if (class_bytes == NULL
926 || host_class == NULL
927 || length != class_bytes_length)
928 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
929
930 objArrayHandle cp_patches_h;
931 if (cp_patches_jh != NULL) {
932 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
933 if (!p->is_objArray())
934 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
935 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
936 }
937
938 KlassHandle host_klass(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(host_class)));
939 const char* host_source = host_klass->external_name();
940 Handle host_loader(THREAD, host_klass->class_loader());
941 Handle host_domain(THREAD, host_klass->protection_domain());
942
943 GrowableArray<Handle>* cp_patches = NULL;
944 if (cp_patches_h.not_null()) {
945 int alen = cp_patches_h->length();
946 for (int i = alen-1; i >= 0; i--) {
947 oop p = cp_patches_h->obj_at(i);
948 if (p != NULL) {
949 Handle patch(THREAD, p);
950 if (cp_patches == NULL)
951 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
952 cp_patches->at_put(i, patch);
953 }
954 }
955 }
956
957 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
958
959 instanceKlassHandle anon_klass;
960 {
961 symbolHandle no_class_name;
962 klassOop anonk = SystemDictionary::parse_stream(no_class_name,
963 host_loader, host_domain,
964 &st, host_klass, cp_patches,
965 CHECK_NULL);
966 if (anonk == NULL) return NULL;
967 anon_klass = instanceKlassHandle(THREAD, anonk);
968 }
969
970 // let caller initialize it as needed...
971
972 return anon_klass->java_mirror();
973 }
974
975 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
976 {
977 UnsafeWrapper("Unsafe_DefineAnonymousClass");
978 ResourceMark rm(THREAD);
979
980 HeapWord* temp_alloc = NULL;
981
982 jobject res_jh = NULL;
983
984 { oop res_oop = Unsafe_DefineAnonymousClass_impl(env,
985 host_class, data, cp_patches_jh,
986 &temp_alloc, THREAD);
987 if (res_oop != NULL)
988 res_jh = JNIHandles::make_local(env, res_oop);
989 }
990
991 // try/finally clause:
992 if (temp_alloc != NULL) {
993 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc);
994 }
995
996 return (jclass) res_jh;
997 }
998 UNSAFE_END
999
1000
1001
1002 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1003 UnsafeWrapper("Unsafe_MonitorEnter");
1004 {
1005 if (jobj == NULL) {
1006 THROW(vmSymbols::java_lang_NullPointerException());
1007 }
1008 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1009 ObjectSynchronizer::jni_enter(obj, CHECK);
1010 }
1011 UNSAFE_END
1012
1013
1014 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1015 UnsafeWrapper("Unsafe_TryMonitorEnter");
1016 {
1017 if (jobj == NULL) {
1018 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1019 }
1020 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1021 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1022 return (res ? JNI_TRUE : JNI_FALSE);
1023 }
1024 UNSAFE_END
1025
1026
1027 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1028 UnsafeWrapper("Unsafe_MonitorExit");
1029 {
1030 if (jobj == NULL) {
1031 THROW(vmSymbols::java_lang_NullPointerException());
1032 }
1033 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1034 ObjectSynchronizer::jni_exit(obj(), CHECK);
1035 }
1036 UNSAFE_END
1037
1038
1039 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1040 UnsafeWrapper("Unsafe_ThrowException");
1041 {
1042 ThreadToNativeFromVM ttnfv(thread);
1043 env->Throw(thr);
1044 }
1045 UNSAFE_END
1046
1047 // JSR166 ------------------------------------------------------------------
1048
1049 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1050 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1051 oop x = JNIHandles::resolve(x_h);
1052 oop e = JNIHandles::resolve(e_h);
1053 oop p = JNIHandles::resolve(obj);
1054 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1055 if (UseCompressedOops) {
1056 update_barrier_set_pre((narrowOop*)addr, e);
1057 } else {
1058 update_barrier_set_pre((oop*)addr, e);
1059 }
1060 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e);
1061 jboolean success = (res == e);
1062 if (success)
1063 update_barrier_set((void*)addr, x);
1064 return success;
1065 UNSAFE_END
1066
1067 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1068 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1069 oop p = JNIHandles::resolve(obj);
1070 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1071 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1072 UNSAFE_END
1073
1074 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1075 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1076 Handle p (THREAD, JNIHandles::resolve(obj));
1077 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1078 if (VM_Version::supports_cx8())
1079 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1080 else {
1081 jboolean success = false;
1082 ObjectLocker ol(p, THREAD);
1083 if (*addr == e) { *addr = x; success = true; }
1084 return success;
1085 }
1086 UNSAFE_END
1087
1088 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1089 UnsafeWrapper("Unsafe_Park");
1090 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1091 JavaThreadParkedState jtps(thread, time != 0);
1092 thread->parker()->park(isAbsolute != 0, time);
1093 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1094 UNSAFE_END
1095
1096 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1097 UnsafeWrapper("Unsafe_Unpark");
1098 Parker* p = NULL;
1099 if (jthread != NULL) {
1100 oop java_thread = JNIHandles::resolve_non_null(jthread);
1101 if (java_thread != NULL) {
1102 jlong lp = java_lang_Thread::park_event(java_thread);
1103 if (lp != 0) {
1104 // This cast is OK even though the jlong might have been read
1105 // non-atomically on 32bit systems, since there, one word will
1106 // always be zero anyway and the value set is always the same
1107 p = (Parker*)addr_from_java(lp);
1108 } else {
1109 // Grab lock if apparently null or using older version of library
1110 MutexLocker mu(Threads_lock);
1111 java_thread = JNIHandles::resolve_non_null(jthread);
1112 if (java_thread != NULL) {
1113 JavaThread* thr = java_lang_Thread::thread(java_thread);
1114 if (thr != NULL) {
1115 p = thr->parker();
1116 if (p != NULL) { // Bind to Java thread for next time.
1117 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1118 }
1119 }
1120 }
1121 }
1122 }
1123 }
1124 if (p != NULL) {
1125 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1126 p->unpark();
1127 }
1128 UNSAFE_END
1129
1130 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1131 UnsafeWrapper("Unsafe_Loadavg");
1132 const int max_nelem = 3;
1133 double la[max_nelem];
1134 jint ret;
1135
1136 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1137 assert(a->is_typeArray(), "must be type array");
1138
1139 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1140 ThreadToNativeFromVM ttnfv(thread);
1141 throw_new(env, "ArrayIndexOutOfBoundsException");
1142 return -1;
1143 }
1144
1145 ret = os::loadavg(la, nelem);
1146 if (ret == -1) return -1;
1147
1148 // if successful, ret is the number of samples actually retrieved.
1149 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1150 switch(ret) {
1151 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1152 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1153 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1154 }
1155 return ret;
1156 UNSAFE_END
1157
1158 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1159 UnsafeWrapper("Unsafe_PrefetchRead");
1160 oop p = JNIHandles::resolve(obj);
1161 void* addr = index_oop_from_field_offset_long(p, 0);
1162 Prefetch::read(addr, (intx)offset);
1163 UNSAFE_END
1164
1165 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1166 UnsafeWrapper("Unsafe_PrefetchWrite");
1167 oop p = JNIHandles::resolve(obj);
1168 void* addr = index_oop_from_field_offset_long(p, 0);
1169 Prefetch::write(addr, (intx)offset);
1170 UNSAFE_END
1171
1172
1173 /// JVM_RegisterUnsafeMethods
1174
1175 #define ADR "J"
1176
1177 #define LANG "Ljava/lang/"
1178
1179 #define OBJ LANG"Object;"
1180 #define CLS LANG"Class;"
1181 #define CTR LANG"reflect/Constructor;"
1182 #define FLD LANG"reflect/Field;"
1183 #define MTH LANG"reflect/Method;"
1184 #define THR LANG"Throwable;"
1185
1186 #define DC0_Args LANG"String;[BII"
1187 #define DC1_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1188
1189 #define CC (char*) /*cast a literal from (const char*)*/
1190 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1191
1192 // define deprecated accessors for compabitility with 1.4.0
1193 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1194 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1195 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1196
1197 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1198 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1199 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1200 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1201
1202 // Note: In 1.5.0, there are volatile versions too
1203 #define DECLARE_GETSETOOP(Boolean, Z) \
1204 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1205 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1206 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1207 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1208
1209
1210 #define DECLARE_GETSETNATIVE(Byte, B) \
1211 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1212 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1213
1214
1215
1216 // %%% These are temporarily supported until the SDK sources
1217 // contain the necessarily updated Unsafe.java.
1218 static JNINativeMethod methods_140[] = {
1219
1220 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)},
1221 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)},
1222
1223 DECLARE_GETSETOOP_140(Boolean, Z),
1224 DECLARE_GETSETOOP_140(Byte, B),
1225 DECLARE_GETSETOOP_140(Short, S),
1226 DECLARE_GETSETOOP_140(Char, C),
1227 DECLARE_GETSETOOP_140(Int, I),
1228 DECLARE_GETSETOOP_140(Long, J),
1229 DECLARE_GETSETOOP_140(Float, F),
1230 DECLARE_GETSETOOP_140(Double, D),
1231
1232 DECLARE_GETSETNATIVE(Byte, B),
1233 DECLARE_GETSETNATIVE(Short, S),
1234 DECLARE_GETSETNATIVE(Char, C),
1235 DECLARE_GETSETNATIVE(Int, I),
1236 DECLARE_GETSETNATIVE(Long, J),
1237 DECLARE_GETSETNATIVE(Float, F),
1238 DECLARE_GETSETNATIVE(Double, D),
1239
1240 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1241 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1242
1243 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1244 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1245 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1246 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1247 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1248
1249 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, //deprecated
1250 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, //deprecated
1251 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1252 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1253 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1254 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1255 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1256
1257 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1258 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1259 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1260 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1261 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1262 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1263 };
1264
1265 // These are the old methods prior to the JSR 166 changes in 1.5.0
1266 static JNINativeMethod methods_141[] = {
1267
1268 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1269 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1270
1271 DECLARE_GETSETOOP_141(Boolean, Z),
1272 DECLARE_GETSETOOP_141(Byte, B),
1273 DECLARE_GETSETOOP_141(Short, S),
1274 DECLARE_GETSETOOP_141(Char, C),
1275 DECLARE_GETSETOOP_141(Int, I),
1276 DECLARE_GETSETOOP_141(Long, J),
1277 DECLARE_GETSETOOP_141(Float, F),
1278 DECLARE_GETSETOOP_141(Double, D),
1279
1280 DECLARE_GETSETNATIVE(Byte, B),
1281 DECLARE_GETSETNATIVE(Short, S),
1282 DECLARE_GETSETNATIVE(Char, C),
1283 DECLARE_GETSETNATIVE(Int, I),
1284 DECLARE_GETSETNATIVE(Long, J),
1285 DECLARE_GETSETNATIVE(Float, F),
1286 DECLARE_GETSETNATIVE(Double, D),
1287
1288 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1289 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1290
1291 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1292 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1293 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1294 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1295 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1296
1297 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1298 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1299 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1300 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1301 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1302 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1303 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1304 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1305
1306 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1307 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1308 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1309 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1310 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1311 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1312
1313 };
1314
1315 // These are the old methods prior to the JSR 166 changes in 1.6.0
1316 static JNINativeMethod methods_15[] = {
1317
1318 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1319 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1320 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1321 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1322
1323
1324 DECLARE_GETSETOOP(Boolean, Z),
1325 DECLARE_GETSETOOP(Byte, B),
1326 DECLARE_GETSETOOP(Short, S),
1327 DECLARE_GETSETOOP(Char, C),
1328 DECLARE_GETSETOOP(Int, I),
1329 DECLARE_GETSETOOP(Long, J),
1330 DECLARE_GETSETOOP(Float, F),
1331 DECLARE_GETSETOOP(Double, D),
1332
1333 DECLARE_GETSETNATIVE(Byte, B),
1334 DECLARE_GETSETNATIVE(Short, S),
1335 DECLARE_GETSETNATIVE(Char, C),
1336 DECLARE_GETSETNATIVE(Int, I),
1337 DECLARE_GETSETNATIVE(Long, J),
1338 DECLARE_GETSETNATIVE(Float, F),
1339 DECLARE_GETSETNATIVE(Double, D),
1340
1341 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1342 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1343
1344 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1345 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1346 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1347 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1348 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1349
1350 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1351 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1352 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1353 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1354 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1355 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1356 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1357 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1358
1359 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1360 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1361 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1362 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1363 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1364 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1365 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1366 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1367 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1368 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1369 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1370
1371 };
1372
1373 // These are the correct methods, moving forward:
1374 static JNINativeMethod methods[] = {
1375
1376 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1377 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1378 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1379 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1380
1381
1382 DECLARE_GETSETOOP(Boolean, Z),
1383 DECLARE_GETSETOOP(Byte, B),
1384 DECLARE_GETSETOOP(Short, S),
1385 DECLARE_GETSETOOP(Char, C),
1386 DECLARE_GETSETOOP(Int, I),
1387 DECLARE_GETSETOOP(Long, J),
1388 DECLARE_GETSETOOP(Float, F),
1389 DECLARE_GETSETOOP(Double, D),
1390
1391 DECLARE_GETSETNATIVE(Byte, B),
1392 DECLARE_GETSETNATIVE(Short, S),
1393 DECLARE_GETSETNATIVE(Char, C),
1394 DECLARE_GETSETNATIVE(Int, I),
1395 DECLARE_GETSETNATIVE(Long, J),
1396 DECLARE_GETSETNATIVE(Float, F),
1397 DECLARE_GETSETNATIVE(Double, D),
1398
1399 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1400 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1401
1402 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1403 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1404 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1405 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1406 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1407
1408 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1409 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1410 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1411 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1412 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1413 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1414 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1415 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1416
1417 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1418 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1419 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1420 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1421 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1422 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1423 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1424 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1425 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1426 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1427 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1428 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1429 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1430 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1431 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1432
1433 // {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)},
1434
1435 // {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1436 // {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1437 // {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1438 // {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1439
1440 };
1441
1442 JNINativeMethod loadavg_method[] = {
1443 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1444 };
1445
1446 JNINativeMethod prefetch_methods[] = {
1447 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1448 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1449 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1450 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1451 };
1452
1453 JNINativeMethod memcopy_methods[] = {
1454 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1455 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1456 };
1457
1458 JNINativeMethod memcopy_methods_15[] = {
1459 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1460 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1461 };
1462
1463 JNINativeMethod anonk_methods[] = {
1464 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1465 };
1466
1467 #undef CC
1468 #undef FN_PTR
1469
1470 #undef ADR
1471 #undef LANG
1472 #undef OBJ
1473 #undef CLS
1474 #undef CTR
1475 #undef FLD
1476 #undef MTH
1477 #undef THR
1478 #undef DC0_Args
1479 #undef DC1_Args
1480
1481 #undef DECLARE_GETSETOOP
1482 #undef DECLARE_GETSETNATIVE
1483
1484
1485 // This one function is exported, used by NativeLookup.
1486 // The Unsafe_xxx functions above are called only from the interpreter.
1487 // The optimizer looks at names and signatures to recognize
1488 // individual functions.
1489
1490 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1491 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1492 {
1493 ThreadToNativeFromVM ttnfv(thread);
1494 {
1495 env->RegisterNatives(unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1496 if (env->ExceptionOccurred()) {
1497 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1498 tty->print_cr("Warning: SDK 1.6 Unsafe.loadavg not found.");
1499 }
1500 env->ExceptionClear();
1501 }
1502 }
1503 {
1504 env->RegisterNatives(unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1505 if (env->ExceptionOccurred()) {
1506 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1507 tty->print_cr("Warning: SDK 1.6 Unsafe.prefetchRead/Write not found.");
1508 }
1509 env->ExceptionClear();
1510 }
1511 }
1512 {
1513 env->RegisterNatives(unsafecls, memcopy_methods, sizeof(memcopy_methods)/sizeof(JNINativeMethod));
1514 if (env->ExceptionOccurred()) {
1515 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1516 tty->print_cr("Warning: SDK 1.7 Unsafe.copyMemory not found.");
1517 }
1518 env->ExceptionClear();
1519 env->RegisterNatives(unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1520 if (env->ExceptionOccurred()) {
1521 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1522 tty->print_cr("Warning: SDK 1.5 Unsafe.copyMemory not found.");
1523 }
1524 env->ExceptionClear();
1525 }
1526 }
1527 }
1528 if (AnonymousClasses) {
1529 env->RegisterNatives(unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1530 if (env->ExceptionOccurred()) {
1531 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1532 tty->print_cr("Warning: SDK 1.7 Unsafe.defineClass (anonymous version) not found.");
1533 }
1534 env->ExceptionClear();
1535 }
1536 }
1537 int status = env->RegisterNatives(unsafecls, methods, sizeof(methods)/sizeof(JNINativeMethod));
1538 if (env->ExceptionOccurred()) {
1539 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1540 tty->print_cr("Warning: SDK 1.6 version of Unsafe not found.");
1541 }
1542 env->ExceptionClear();
1543 // %%% For now, be backward compatible with an older class:
1544 status = env->RegisterNatives(unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1545 }
1546 if (env->ExceptionOccurred()) {
1547 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1548 tty->print_cr("Warning: SDK 1.5 version of Unsafe not found.");
1549 }
1550 env->ExceptionClear();
1551 // %%% For now, be backward compatible with an older class:
1552 status = env->RegisterNatives(unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1553 }
1554 if (env->ExceptionOccurred()) {
1555 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1556 tty->print_cr("Warning: SDK 1.4.1 version of Unsafe not found.");
1557 }
1558 env->ExceptionClear();
1559 // %%% For now, be backward compatible with an older class:
1560 status = env->RegisterNatives(unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1561 }
1562 guarantee(status == 0, "register unsafe natives");
1563 }
1564 JVM_END