1 /*
2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/vmSymbols.hpp"
27 #include "memory/allocation.inline.hpp"
28 #include "prims/jni.h"
29 #include "prims/jvm.h"
30 #include "runtime/globals.hpp"
31 #include "runtime/interfaceSupport.hpp"
32 #include "runtime/reflection.hpp"
33 #include "runtime/reflectionCompat.hpp"
34 #include "runtime/synchronizer.hpp"
35 #include "services/threadService.hpp"
36 #include "utilities/copy.hpp"
37 #include "utilities/dtrace.hpp"
38
39 /*
40 * Implementation of class sun.misc.Unsafe
41 */
42
43 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long);
44 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t);
45 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t);
46
47 #define MAX_OBJECT_SIZE \
48 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
49 + ((julong)max_jint * sizeof(double)) )
50
51
52 #define UNSAFE_ENTRY(result_type, header) \
53 JVM_ENTRY(result_type, header)
54
55 // Can't use UNSAFE_LEAF because it has the signature of a straight
56 // call into the runtime (just like JVM_LEAF, funny that) but it's
57 // called like a Java Native and thus the wrapper built for it passes
58 // arguments like a JNI call. It expects those arguments to be popped
59 // from the stack on Intel like all good JNI args are, and adjusts the
60 // stack according. Since the JVM_LEAF call expects no extra
61 // arguments the stack isn't popped in the C code, is pushed by the
62 // wrapper and we get sick.
63 //#define UNSAFE_LEAF(result_type, header) \
64 // JVM_LEAF(result_type, header)
65
66 #define UNSAFE_END JVM_END
67
68 #define UnsafeWrapper(arg) /*nothing, for the present*/
69
70
71 inline void* addr_from_java(jlong addr) {
72 // This assert fails in a variety of ways on 32-bit systems.
73 // It is impossible to predict whether native code that converts
74 // pointers to longs will sign-extend or zero-extend the addresses.
75 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
76 return (void*)(uintptr_t)addr;
77 }
78
79 inline jlong addr_to_java(void* p) {
80 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
81 return (uintptr_t)p;
82 }
83
84
85 // Note: The VM's obj_field and related accessors use byte-scaled
86 // ("unscaled") offsets, just as the unsafe methods do.
87
88 // However, the method Unsafe.fieldOffset explicitly declines to
89 // guarantee this. The field offset values manipulated by the Java user
90 // through the Unsafe API are opaque cookies that just happen to be byte
91 // offsets. We represent this state of affairs by passing the cookies
92 // through conversion functions when going between the VM and the Unsafe API.
93 // The conversion functions just happen to be no-ops at present.
94
95 inline jlong field_offset_to_byte_offset(jlong field_offset) {
96 return field_offset;
97 }
98
99 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
100 return byte_offset;
101 }
102
103 inline jint invocation_key_from_method_slot(jint slot) {
104 return slot;
105 }
106
107 inline jint invocation_key_to_method_slot(jint key) {
108 return key;
109 }
110
111 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
112 jlong byte_offset = field_offset_to_byte_offset(field_offset);
113 #ifdef ASSERT
114 if (p != NULL) {
115 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
116 if (byte_offset == (jint)byte_offset) {
117 void* ptr_plus_disp = (address)p + byte_offset;
118 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
119 "raw [ptr+disp] must be consistent with oop::field_base");
120 }
121 }
122 #endif
123 if (sizeof(char*) == sizeof(jint)) // (this constant folds!)
124 return (address)p + (jint) byte_offset;
125 else
126 return (address)p + byte_offset;
127 }
128
129 // Externally callable versions:
130 // (Use these in compiler intrinsics which emulate unsafe primitives.)
131 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
132 return field_offset;
133 }
134 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
135 return byte_offset;
136 }
137 jint Unsafe_invocation_key_from_method_slot(jint slot) {
138 return invocation_key_from_method_slot(slot);
139 }
140 jint Unsafe_invocation_key_to_method_slot(jint key) {
141 return invocation_key_to_method_slot(key);
142 }
143
144
145 ///// Data in the Java heap.
146
147 #define GET_FIELD(obj, offset, type_name, v) \
148 oop p = JNIHandles::resolve(obj); \
149 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
150
151 #define SET_FIELD(obj, offset, type_name, x) \
152 oop p = JNIHandles::resolve(obj); \
153 *(type_name*)index_oop_from_field_offset_long(p, offset) = x
154
155 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
156 oop p = JNIHandles::resolve(obj); \
157 volatile type_name v = *(volatile type_name*)index_oop_from_field_offset_long(p, offset)
158
159 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
160 oop p = JNIHandles::resolve(obj); \
161 *(volatile type_name*)index_oop_from_field_offset_long(p, offset) = x; \
162 OrderAccess::fence();
163
164 // Macros for oops that check UseCompressedOops
165
166 #define GET_OOP_FIELD(obj, offset, v) \
167 oop p = JNIHandles::resolve(obj); \
168 oop v; \
169 if (UseCompressedOops) { \
170 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
171 v = oopDesc::decode_heap_oop(n); \
172 } else { \
173 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
174 }
175
176 #define GET_OOP_FIELD_VOLATILE(obj, offset, v) \
177 oop p = JNIHandles::resolve(obj); \
178 volatile oop v; \
179 if (UseCompressedOops) { \
180 volatile narrowOop n = *(volatile narrowOop*)index_oop_from_field_offset_long(p, offset); \
181 v = oopDesc::decode_heap_oop(n); \
182 } else { \
183 v = *(volatile oop*)index_oop_from_field_offset_long(p, offset); \
184 }
185
186
187 // Get/SetObject must be special-cased, since it works with handles.
188
189 // The xxx140 variants for backward compatibility do not allow a full-width offset.
190 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
191 UnsafeWrapper("Unsafe_GetObject");
192 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
193 GET_OOP_FIELD(obj, offset, v)
194 return JNIHandles::make_local(env, v);
195 UNSAFE_END
196
197 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
198 UnsafeWrapper("Unsafe_SetObject");
199 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
200 oop x = JNIHandles::resolve(x_h);
201 //SET_FIELD(obj, offset, oop, x);
202 oop p = JNIHandles::resolve(obj);
203 if (UseCompressedOops) {
204 if (x != NULL) {
205 // If there is a heap base pointer, we are obliged to emit a store barrier.
206 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
207 } else {
208 narrowOop n = oopDesc::encode_heap_oop_not_null(x);
209 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
210 }
211 } else {
212 if (x != NULL) {
213 // If there is a heap base pointer, we are obliged to emit a store barrier.
214 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
215 } else {
216 *(oop*)index_oop_from_field_offset_long(p, offset) = x;
217 }
218 }
219 UNSAFE_END
220
221 // The normal variants allow a null base pointer with an arbitrary address.
222 // But if the base pointer is non-null, the offset should make some sense.
223 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
224 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
225 UnsafeWrapper("Unsafe_GetObject");
226 GET_OOP_FIELD(obj, offset, v)
227 return JNIHandles::make_local(env, v);
228 UNSAFE_END
229
230 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
231 UnsafeWrapper("Unsafe_SetObject");
232 oop x = JNIHandles::resolve(x_h);
233 oop p = JNIHandles::resolve(obj);
234 if (UseCompressedOops) {
235 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
236 } else {
237 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
238 }
239 UNSAFE_END
240
241 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
242 UnsafeWrapper("Unsafe_GetObjectVolatile");
243 GET_OOP_FIELD_VOLATILE(obj, offset, v)
244 return JNIHandles::make_local(env, v);
245 UNSAFE_END
246
247 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
248 UnsafeWrapper("Unsafe_SetObjectVolatile");
249 oop x = JNIHandles::resolve(x_h);
250 oop p = JNIHandles::resolve(obj);
251 if (UseCompressedOops) {
252 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
253 } else {
254 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
255 }
256 OrderAccess::fence();
257 UNSAFE_END
258
259 // Volatile long versions must use locks if !VM_Version::supports_cx8().
260 // support_cx8 is a surrogate for 'supports atomic long memory ops'.
261
262 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
263 UnsafeWrapper("Unsafe_GetLongVolatile");
264 {
265 if (VM_Version::supports_cx8()) {
266 GET_FIELD_VOLATILE(obj, offset, jlong, v);
267 return v;
268 }
269 else {
270 Handle p (THREAD, JNIHandles::resolve(obj));
271 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
272 ObjectLocker ol(p, THREAD);
273 jlong value = *addr;
274 return value;
275 }
276 }
277 UNSAFE_END
278
279 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
280 UnsafeWrapper("Unsafe_SetLongVolatile");
281 {
282 if (VM_Version::supports_cx8()) {
283 SET_FIELD_VOLATILE(obj, offset, jlong, x);
284 }
285 else {
286 Handle p (THREAD, JNIHandles::resolve(obj));
287 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
288 ObjectLocker ol(p, THREAD);
289 *addr = x;
290 }
291 }
292 UNSAFE_END
293
294
295 #define DEFINE_GETSETOOP(jboolean, Boolean) \
296 \
297 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
298 UnsafeWrapper("Unsafe_Get"#Boolean); \
299 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
300 GET_FIELD(obj, offset, jboolean, v); \
301 return v; \
302 UNSAFE_END \
303 \
304 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
305 UnsafeWrapper("Unsafe_Set"#Boolean); \
306 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
307 SET_FIELD(obj, offset, jboolean, x); \
308 UNSAFE_END \
309 \
310 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
311 UnsafeWrapper("Unsafe_Get"#Boolean); \
312 GET_FIELD(obj, offset, jboolean, v); \
313 return v; \
314 UNSAFE_END \
315 \
316 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
317 UnsafeWrapper("Unsafe_Set"#Boolean); \
318 SET_FIELD(obj, offset, jboolean, x); \
319 UNSAFE_END \
320 \
321 // END DEFINE_GETSETOOP.
322
323
324 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
325 \
326 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
327 UnsafeWrapper("Unsafe_Get"#Boolean); \
328 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
329 return v; \
330 UNSAFE_END \
331 \
332 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
333 UnsafeWrapper("Unsafe_Set"#Boolean); \
334 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
335 UNSAFE_END \
336 \
337 // END DEFINE_GETSETOOP_VOLATILE.
338
339 DEFINE_GETSETOOP(jboolean, Boolean)
340 DEFINE_GETSETOOP(jbyte, Byte)
341 DEFINE_GETSETOOP(jshort, Short);
342 DEFINE_GETSETOOP(jchar, Char);
343 DEFINE_GETSETOOP(jint, Int);
344 DEFINE_GETSETOOP(jlong, Long);
345 DEFINE_GETSETOOP(jfloat, Float);
346 DEFINE_GETSETOOP(jdouble, Double);
347
348 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
349 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
350 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
351 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
352 DEFINE_GETSETOOP_VOLATILE(jint, Int);
353 // no long -- handled specially
354 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
355 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
356
357 #undef DEFINE_GETSETOOP
358
359 // The non-intrinsified versions of setOrdered just use setVolatile
360
361 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x)) \
362 UnsafeWrapper("Unsafe_SetOrderedInt"); \
363 SET_FIELD_VOLATILE(obj, offset, jint, x); \
364 UNSAFE_END
365
366 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
367 UnsafeWrapper("Unsafe_SetOrderedObject");
368 oop x = JNIHandles::resolve(x_h);
369 oop p = JNIHandles::resolve(obj);
370 if (UseCompressedOops) {
371 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
372 } else {
373 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
374 }
375 OrderAccess::fence();
376 UNSAFE_END
377
378 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
379 UnsafeWrapper("Unsafe_SetOrderedLong");
380 {
381 if (VM_Version::supports_cx8()) {
382 SET_FIELD_VOLATILE(obj, offset, jlong, x);
383 }
384 else {
385 Handle p (THREAD, JNIHandles::resolve(obj));
386 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
387 ObjectLocker ol(p, THREAD);
388 *addr = x;
389 }
390 }
391 UNSAFE_END
392
393 ////// Data in the C heap.
394
395 // Note: These do not throw NullPointerException for bad pointers.
396 // They just crash. Only a oop base pointer can generate a NullPointerException.
397 //
398 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
399 \
400 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
401 UnsafeWrapper("Unsafe_GetNative"#Type); \
402 void* p = addr_from_java(addr); \
403 JavaThread* t = JavaThread::current(); \
404 t->set_doing_unsafe_access(true); \
405 java_type x = *(volatile native_type*)p; \
406 t->set_doing_unsafe_access(false); \
407 return x; \
408 UNSAFE_END \
409 \
410 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
411 UnsafeWrapper("Unsafe_SetNative"#Type); \
412 JavaThread* t = JavaThread::current(); \
413 t->set_doing_unsafe_access(true); \
414 void* p = addr_from_java(addr); \
415 *(volatile native_type*)p = x; \
416 t->set_doing_unsafe_access(false); \
417 UNSAFE_END \
418 \
419 // END DEFINE_GETSETNATIVE.
420
421 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
422 DEFINE_GETSETNATIVE(jshort, Short, signed short);
423 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
424 DEFINE_GETSETNATIVE(jint, Int, jint);
425 // no long -- handled specially
426 DEFINE_GETSETNATIVE(jfloat, Float, float);
427 DEFINE_GETSETNATIVE(jdouble, Double, double);
428
429 #undef DEFINE_GETSETNATIVE
430
431 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
432 UnsafeWrapper("Unsafe_GetNativeLong");
433 JavaThread* t = JavaThread::current();
434 // We do it this way to avoid problems with access to heap using 64
435 // bit loads, as jlong in heap could be not 64-bit aligned, and on
436 // some CPUs (SPARC) it leads to SIGBUS.
437 t->set_doing_unsafe_access(true);
438 void* p = addr_from_java(addr);
439 jlong x;
440 if (((intptr_t)p & 7) == 0) {
441 // jlong is aligned, do a volatile access
442 x = *(volatile jlong*)p;
443 } else {
444 jlong_accessor acc;
445 acc.words[0] = ((volatile jint*)p)[0];
446 acc.words[1] = ((volatile jint*)p)[1];
447 x = acc.long_value;
448 }
449 t->set_doing_unsafe_access(false);
450 return x;
451 UNSAFE_END
452
453 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
454 UnsafeWrapper("Unsafe_SetNativeLong");
455 JavaThread* t = JavaThread::current();
456 // see comment for Unsafe_GetNativeLong
457 t->set_doing_unsafe_access(true);
458 void* p = addr_from_java(addr);
459 if (((intptr_t)p & 7) == 0) {
460 // jlong is aligned, do a volatile access
461 *(volatile jlong*)p = x;
462 } else {
463 jlong_accessor acc;
464 acc.long_value = x;
465 ((volatile jint*)p)[0] = acc.words[0];
466 ((volatile jint*)p)[1] = acc.words[1];
467 }
468 t->set_doing_unsafe_access(false);
469 UNSAFE_END
470
471
472 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
473 UnsafeWrapper("Unsafe_GetNativeAddress");
474 void* p = addr_from_java(addr);
475 return addr_to_java(*(void**)p);
476 UNSAFE_END
477
478 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
479 UnsafeWrapper("Unsafe_SetNativeAddress");
480 void* p = addr_from_java(addr);
481 *(void**)p = addr_from_java(x);
482 UNSAFE_END
483
484
485 ////// Allocation requests
486
487 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
488 UnsafeWrapper("Unsafe_AllocateInstance");
489 {
490 ThreadToNativeFromVM ttnfv(thread);
491 return env->AllocObject(cls);
492 }
493 UNSAFE_END
494
495 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
496 UnsafeWrapper("Unsafe_AllocateMemory");
497 size_t sz = (size_t)size;
498 if (sz != (julong)size || size < 0) {
499 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
500 }
501 if (sz == 0) {
502 return 0;
503 }
504 sz = round_to(sz, HeapWordSize);
505 void* x = os::malloc(sz);
506 if (x == NULL) {
507 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
508 }
509 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
510 return addr_to_java(x);
511 UNSAFE_END
512
513 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
514 UnsafeWrapper("Unsafe_ReallocateMemory");
515 void* p = addr_from_java(addr);
516 size_t sz = (size_t)size;
517 if (sz != (julong)size || size < 0) {
518 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
519 }
520 if (sz == 0) {
521 os::free(p);
522 return 0;
523 }
524 sz = round_to(sz, HeapWordSize);
525 void* x = (p == NULL) ? os::malloc(sz) : os::realloc(p, sz);
526 if (x == NULL) {
527 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
528 }
529 return addr_to_java(x);
530 UNSAFE_END
531
532 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
533 UnsafeWrapper("Unsafe_FreeMemory");
534 void* p = addr_from_java(addr);
535 if (p == NULL) {
536 return;
537 }
538 os::free(p);
539 UNSAFE_END
540
541 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
542 UnsafeWrapper("Unsafe_SetMemory");
543 size_t sz = (size_t)size;
544 if (sz != (julong)size || size < 0) {
545 THROW(vmSymbols::java_lang_IllegalArgumentException());
546 }
547 char* p = (char*) addr_from_java(addr);
548 Copy::fill_to_memory_atomic(p, sz, value);
549 UNSAFE_END
550
551 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
552 UnsafeWrapper("Unsafe_SetMemory");
553 size_t sz = (size_t)size;
554 if (sz != (julong)size || size < 0) {
555 THROW(vmSymbols::java_lang_IllegalArgumentException());
556 }
557 oop base = JNIHandles::resolve(obj);
558 void* p = index_oop_from_field_offset_long(base, offset);
559 Copy::fill_to_memory_atomic(p, sz, value);
560 UNSAFE_END
561
562 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
563 UnsafeWrapper("Unsafe_CopyMemory");
564 if (size == 0) {
565 return;
566 }
567 size_t sz = (size_t)size;
568 if (sz != (julong)size || size < 0) {
569 THROW(vmSymbols::java_lang_IllegalArgumentException());
570 }
571 void* src = addr_from_java(srcAddr);
572 void* dst = addr_from_java(dstAddr);
573 Copy::conjoint_memory_atomic(src, dst, sz);
574 UNSAFE_END
575
576 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
577 UnsafeWrapper("Unsafe_CopyMemory");
578 if (size == 0) {
579 return;
580 }
581 size_t sz = (size_t)size;
582 if (sz != (julong)size || size < 0) {
583 THROW(vmSymbols::java_lang_IllegalArgumentException());
584 }
585 oop srcp = JNIHandles::resolve(srcObj);
586 oop dstp = JNIHandles::resolve(dstObj);
587 if (dstp != NULL && !dstp->is_typeArray()) {
588 // NYI: This works only for non-oop arrays at present.
589 // Generalizing it would be reasonable, but requires card marking.
590 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
591 THROW(vmSymbols::java_lang_IllegalArgumentException());
592 }
593 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
594 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
595 Copy::conjoint_memory_atomic(src, dst, sz);
596 UNSAFE_END
597
598
599 ////// Random queries
600
601 // See comment at file start about UNSAFE_LEAF
602 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
603 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
604 UnsafeWrapper("Unsafe_AddressSize");
605 return sizeof(void*);
606 UNSAFE_END
607
608 // See comment at file start about UNSAFE_LEAF
609 //UNSAFE_LEAF(jint, Unsafe_PageSize())
610 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
611 UnsafeWrapper("Unsafe_PageSize");
612 return os::vm_page_size();
613 UNSAFE_END
614
615 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
616 if (field == NULL) {
617 THROW_0(vmSymbols::java_lang_NullPointerException());
618 }
619
620 oop reflected = JNIHandles::resolve_non_null(field);
621 oop mirror = java_lang_reflect_Field::clazz(reflected);
622 klassOop k = java_lang_Class::as_klassOop(mirror);
623 int slot = java_lang_reflect_Field::slot(reflected);
624 int modifiers = java_lang_reflect_Field::modifiers(reflected);
625
626 if (must_be_static >= 0) {
627 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
628 if (must_be_static != really_is_static) {
629 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
630 }
631 }
632
633 int offset = instanceKlass::cast(k)->offset_from_fields(slot);
634 return field_offset_from_byte_offset(offset);
635 }
636
637 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
638 UnsafeWrapper("Unsafe_ObjectFieldOffset");
639 return find_field_offset(field, 0, THREAD);
640 UNSAFE_END
641
642 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
643 UnsafeWrapper("Unsafe_StaticFieldOffset");
644 return find_field_offset(field, 1, THREAD);
645 UNSAFE_END
646
647 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
648 UnsafeWrapper("Unsafe_StaticFieldBase");
649 // Note: In this VM implementation, a field address is always a short
650 // offset from the base of a a klass metaobject. Thus, the full dynamic
651 // range of the return type is never used. However, some implementations
652 // might put the static field inside an array shared by many classes,
653 // or even at a fixed address, in which case the address could be quite
654 // large. In that last case, this function would return NULL, since
655 // the address would operate alone, without any base pointer.
656
657 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
658
659 oop reflected = JNIHandles::resolve_non_null(field);
660 oop mirror = java_lang_reflect_Field::clazz(reflected);
661 int modifiers = java_lang_reflect_Field::modifiers(reflected);
662
663 if ((modifiers & JVM_ACC_STATIC) == 0) {
664 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
665 }
666
667 return JNIHandles::make_local(env, java_lang_Class::as_klassOop(mirror));
668 UNSAFE_END
669
670 //@deprecated
671 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
672 UnsafeWrapper("Unsafe_FieldOffset");
673 // tries (but fails) to be polymorphic between static and non-static:
674 jlong offset = find_field_offset(field, -1, THREAD);
675 guarantee(offset == (jint)offset, "offset fits in 32 bits");
676 return (jint)offset;
677 UNSAFE_END
678
679 //@deprecated
680 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
681 UnsafeWrapper("Unsafe_StaticFieldBase");
682 if (clazz == NULL) {
683 THROW_0(vmSymbols::java_lang_NullPointerException());
684 }
685 return JNIHandles::make_local(env, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
686 UNSAFE_END
687
688 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz))
689 UnsafeWrapper("Unsafe_EnsureClassInitialized");
690 if (clazz == NULL) {
691 THROW(vmSymbols::java_lang_NullPointerException());
692 }
693 oop mirror = JNIHandles::resolve_non_null(clazz);
694 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(mirror));
695 if (k != NULL) {
696 k->initialize(CHECK);
697 }
698 UNSAFE_END
699
700 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
701 if (acls == NULL) {
702 THROW(vmSymbols::java_lang_NullPointerException());
703 }
704 oop mirror = JNIHandles::resolve_non_null(acls);
705 klassOop k = java_lang_Class::as_klassOop(mirror);
706 if (k == NULL || !k->klass_part()->oop_is_array()) {
707 THROW(vmSymbols::java_lang_InvalidClassException());
708 } else if (k->klass_part()->oop_is_objArray()) {
709 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
710 scale = heapOopSize;
711 } else if (k->klass_part()->oop_is_typeArray()) {
712 typeArrayKlass* tak = typeArrayKlass::cast(k);
713 base = tak->array_header_in_bytes();
714 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
715 scale = (1 << tak->log2_element_size());
716 } else {
717 ShouldNotReachHere();
718 }
719 }
720
721 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
722 UnsafeWrapper("Unsafe_ArrayBaseOffset");
723 int base, scale;
724 getBaseAndScale(base, scale, acls, CHECK_0);
725 return field_offset_from_byte_offset(base);
726 UNSAFE_END
727
728
729 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
730 UnsafeWrapper("Unsafe_ArrayIndexScale");
731 int base, scale;
732 getBaseAndScale(base, scale, acls, CHECK_0);
733 // This VM packs both fields and array elements down to the byte.
734 // But watch out: If this changes, so that array references for
735 // a given primitive type (say, T_BOOLEAN) use different memory units
736 // than fields, this method MUST return zero for such arrays.
737 // For example, the VM used to store sub-word sized fields in full
738 // words in the object layout, so that accessors like getByte(Object,int)
739 // did not really do what one might expect for arrays. Therefore,
740 // this function used to report a zero scale factor, so that the user
741 // would know not to attempt to access sub-word array elements.
742 // // Code for unpacked fields:
743 // if (scale < wordSize) return 0;
744
745 // The following allows for a pretty general fieldOffset cookie scheme,
746 // but requires it to be linear in byte offset.
747 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
748 UNSAFE_END
749
750
751 static inline void throw_new(JNIEnv *env, const char *ename) {
752 char buf[100];
753 strcpy(buf, "java/lang/");
754 strcat(buf, ename);
755 jclass cls = env->FindClass(buf);
756 char* msg = NULL;
757 env->ThrowNew(cls, msg);
758 }
759
760 static jclass Unsafe_DefineClass(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
761 {
762 // Code lifted from JDK 1.3 ClassLoader.c
763
764 jbyte *body;
765 char *utfName;
766 jclass result = 0;
767 char buf[128];
768
769 if (UsePerfData) {
770 ClassLoader::unsafe_defineClassCallCounter()->inc();
771 }
772
773 if (data == NULL) {
774 throw_new(env, "NullPointerException");
775 return 0;
776 }
777
778 /* Work around 4153825. malloc crashes on Solaris when passed a
779 * negative size.
780 */
781 if (length < 0) {
782 throw_new(env, "ArrayIndexOutOfBoundsException");
783 return 0;
784 }
785
786 body = NEW_C_HEAP_ARRAY(jbyte, length);
787
788 if (body == 0) {
789 throw_new(env, "OutOfMemoryError");
790 return 0;
791 }
792
793 env->GetByteArrayRegion(data, offset, length, body);
794
795 if (env->ExceptionOccurred())
796 goto free_body;
797
798 if (name != NULL) {
799 uint len = env->GetStringUTFLength(name);
800 int unicode_len = env->GetStringLength(name);
801 if (len >= sizeof(buf)) {
802 utfName = NEW_C_HEAP_ARRAY(char, len + 1);
803 if (utfName == NULL) {
804 throw_new(env, "OutOfMemoryError");
805 goto free_body;
806 }
807 } else {
808 utfName = buf;
809 }
810 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
811 //VerifyFixClassname(utfName);
812 for (uint i = 0; i < len; i++) {
813 if (utfName[i] == '.') utfName[i] = '/';
814 }
815 } else {
816 utfName = NULL;
817 }
818
819 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
820
821 if (utfName && utfName != buf)
822 FREE_C_HEAP_ARRAY(char, utfName);
823
824 free_body:
825 FREE_C_HEAP_ARRAY(jbyte, body);
826 return result;
827 }
828 }
829
830
831 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
832 UnsafeWrapper("Unsafe_DefineClass");
833 {
834 ThreadToNativeFromVM ttnfv(thread);
835
836 int depthFromDefineClass0 = 1;
837 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
838 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
839 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
840
841 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
842 }
843 UNSAFE_END
844
845
846 UNSAFE_ENTRY(jclass, Unsafe_DefineClass1(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
847 UnsafeWrapper("Unsafe_DefineClass");
848 {
849 ThreadToNativeFromVM ttnfv(thread);
850
851 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
852 }
853 UNSAFE_END
854
855 #define DAC_Args CLS"[B["OBJ
856 // define a class but do not make it known to the class loader or system dictionary
857 // - host_class: supplies context for linkage, access control, protection domain, and class loader
858 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
859 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
860
861 // When you load an anonymous class U, it works as if you changed its name just before loading,
862 // to a name that you will never use again. Since the name is lost, no other class can directly
863 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
864 // through java.lang.Class methods like Class.newInstance.
865
866 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
867 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
868 // An anonymous class also has special privileges to access any member of its host class.
869 // This is the main reason why this loading operation is unsafe. The purpose of this is to
870 // allow language implementations to simulate "open classes"; a host class in effect gets
871 // new code when an anonymous class is loaded alongside it. A less convenient but more
872 // standard way to do this is with reflection, which can also be set to ignore access
873 // restrictions.
874
875 // Access into an anonymous class is possible only through reflection. Therefore, there
876 // are no special access rules for calling into an anonymous class. The relaxed access
877 // rule for the host class is applied in the opposite direction: A host class reflectively
878 // access one of its anonymous classes.
879
880 // If you load the same bytecodes twice, you get two different classes. You can reload
881 // the same bytecodes with or without varying CP patches.
882
883 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
884 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
885 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
886
887 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
888 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
889 // It is not possible for a named class, or an older anonymous class, to refer by
890 // name (via its CP) to a newer anonymous class.
891
892 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
893 // or type descriptors used in the loaded anonymous class.
894
895 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
896 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
897 // be changed to println(greeting), where greeting is an arbitrary object created before
898 // the anonymous class is loaded. This is useful in dynamic languages, in which
899 // various kinds of metaobjects must be introduced as constants into bytecode.
900 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
901 // not just a literal string. For such ldc instructions, the verifier uses the
902 // type Object instead of String, if the loaded constant is not in fact a String.
903
904 static oop
905 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
906 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
907 HeapWord* *temp_alloc,
908 TRAPS) {
909
910 if (UsePerfData) {
911 ClassLoader::unsafe_defineClassCallCounter()->inc();
912 }
913
914 if (data == NULL) {
915 THROW_0(vmSymbols::java_lang_NullPointerException());
916 }
917
918 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
919 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
920 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length);
921 if (body == NULL) {
922 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
923 }
924
925 // caller responsible to free it:
926 (*temp_alloc) = body;
927
928 {
929 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
930 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
931 }
932
933 u1* class_bytes = (u1*) body;
934 int class_bytes_length = (int) length;
935 if (class_bytes_length < 0) class_bytes_length = 0;
936 if (class_bytes == NULL
937 || host_class == NULL
938 || length != class_bytes_length)
939 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
940
941 objArrayHandle cp_patches_h;
942 if (cp_patches_jh != NULL) {
943 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
944 if (!p->is_objArray())
945 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
946 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
947 }
948
949 KlassHandle host_klass(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(host_class)));
950 const char* host_source = host_klass->external_name();
951 Handle host_loader(THREAD, host_klass->class_loader());
952 Handle host_domain(THREAD, host_klass->protection_domain());
953
954 GrowableArray<Handle>* cp_patches = NULL;
955 if (cp_patches_h.not_null()) {
956 int alen = cp_patches_h->length();
957 for (int i = alen-1; i >= 0; i--) {
958 oop p = cp_patches_h->obj_at(i);
959 if (p != NULL) {
960 Handle patch(THREAD, p);
961 if (cp_patches == NULL)
962 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
963 cp_patches->at_put(i, patch);
964 }
965 }
966 }
967
968 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
969
970 instanceKlassHandle anon_klass;
971 {
972 symbolHandle no_class_name;
973 klassOop anonk = SystemDictionary::parse_stream(no_class_name,
974 host_loader, host_domain,
975 &st, host_klass, cp_patches,
976 CHECK_NULL);
977 if (anonk == NULL) return NULL;
978 anon_klass = instanceKlassHandle(THREAD, anonk);
979 }
980
981 // let caller initialize it as needed...
982
983 return anon_klass->java_mirror();
984 }
985
986 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
987 {
988 UnsafeWrapper("Unsafe_DefineAnonymousClass");
989 ResourceMark rm(THREAD);
990
991 HeapWord* temp_alloc = NULL;
992
993 jobject res_jh = NULL;
994
995 { oop res_oop = Unsafe_DefineAnonymousClass_impl(env,
996 host_class, data, cp_patches_jh,
997 &temp_alloc, THREAD);
998 if (res_oop != NULL)
999 res_jh = JNIHandles::make_local(env, res_oop);
1000 }
1001
1002 // try/finally clause:
1003 if (temp_alloc != NULL) {
1004 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc);
1005 }
1006
1007 return (jclass) res_jh;
1008 }
1009 UNSAFE_END
1010
1011
1012
1013 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1014 UnsafeWrapper("Unsafe_MonitorEnter");
1015 {
1016 if (jobj == NULL) {
1017 THROW(vmSymbols::java_lang_NullPointerException());
1018 }
1019 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1020 ObjectSynchronizer::jni_enter(obj, CHECK);
1021 }
1022 UNSAFE_END
1023
1024
1025 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1026 UnsafeWrapper("Unsafe_TryMonitorEnter");
1027 {
1028 if (jobj == NULL) {
1029 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1030 }
1031 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1032 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1033 return (res ? JNI_TRUE : JNI_FALSE);
1034 }
1035 UNSAFE_END
1036
1037
1038 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1039 UnsafeWrapper("Unsafe_MonitorExit");
1040 {
1041 if (jobj == NULL) {
1042 THROW(vmSymbols::java_lang_NullPointerException());
1043 }
1044 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1045 ObjectSynchronizer::jni_exit(obj(), CHECK);
1046 }
1047 UNSAFE_END
1048
1049
1050 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1051 UnsafeWrapper("Unsafe_ThrowException");
1052 {
1053 ThreadToNativeFromVM ttnfv(thread);
1054 env->Throw(thr);
1055 }
1056 UNSAFE_END
1057
1058 // JSR166 ------------------------------------------------------------------
1059
1060 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1061 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1062 oop x = JNIHandles::resolve(x_h);
1063 oop e = JNIHandles::resolve(e_h);
1064 oop p = JNIHandles::resolve(obj);
1065 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1066 if (UseCompressedOops) {
1067 update_barrier_set_pre((narrowOop*)addr, e);
1068 } else {
1069 update_barrier_set_pre((oop*)addr, e);
1070 }
1071 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e);
1072 jboolean success = (res == e);
1073 if (success)
1074 update_barrier_set((void*)addr, x);
1075 return success;
1076 UNSAFE_END
1077
1078 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1079 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1080 oop p = JNIHandles::resolve(obj);
1081 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1082 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1083 UNSAFE_END
1084
1085 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1086 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1087 Handle p (THREAD, JNIHandles::resolve(obj));
1088 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1089 if (VM_Version::supports_cx8())
1090 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1091 else {
1092 jboolean success = false;
1093 ObjectLocker ol(p, THREAD);
1094 if (*addr == e) { *addr = x; success = true; }
1095 return success;
1096 }
1097 UNSAFE_END
1098
1099 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1100 UnsafeWrapper("Unsafe_Park");
1101 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1102 JavaThreadParkedState jtps(thread, time != 0);
1103 thread->parker()->park(isAbsolute != 0, time);
1104 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1105 UNSAFE_END
1106
1107 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1108 UnsafeWrapper("Unsafe_Unpark");
1109 Parker* p = NULL;
1110 if (jthread != NULL) {
1111 oop java_thread = JNIHandles::resolve_non_null(jthread);
1112 if (java_thread != NULL) {
1113 jlong lp = java_lang_Thread::park_event(java_thread);
1114 if (lp != 0) {
1115 // This cast is OK even though the jlong might have been read
1116 // non-atomically on 32bit systems, since there, one word will
1117 // always be zero anyway and the value set is always the same
1118 p = (Parker*)addr_from_java(lp);
1119 } else {
1120 // Grab lock if apparently null or using older version of library
1121 MutexLocker mu(Threads_lock);
1122 java_thread = JNIHandles::resolve_non_null(jthread);
1123 if (java_thread != NULL) {
1124 JavaThread* thr = java_lang_Thread::thread(java_thread);
1125 if (thr != NULL) {
1126 p = thr->parker();
1127 if (p != NULL) { // Bind to Java thread for next time.
1128 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1129 }
1130 }
1131 }
1132 }
1133 }
1134 }
1135 if (p != NULL) {
1136 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1137 p->unpark();
1138 }
1139 UNSAFE_END
1140
1141 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1142 UnsafeWrapper("Unsafe_Loadavg");
1143 const int max_nelem = 3;
1144 double la[max_nelem];
1145 jint ret;
1146
1147 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1148 assert(a->is_typeArray(), "must be type array");
1149
1150 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1151 ThreadToNativeFromVM ttnfv(thread);
1152 throw_new(env, "ArrayIndexOutOfBoundsException");
1153 return -1;
1154 }
1155
1156 ret = os::loadavg(la, nelem);
1157 if (ret == -1) return -1;
1158
1159 // if successful, ret is the number of samples actually retrieved.
1160 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1161 switch(ret) {
1162 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1163 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1164 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1165 }
1166 return ret;
1167 UNSAFE_END
1168
1169 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1170 UnsafeWrapper("Unsafe_PrefetchRead");
1171 oop p = JNIHandles::resolve(obj);
1172 void* addr = index_oop_from_field_offset_long(p, 0);
1173 Prefetch::read(addr, (intx)offset);
1174 UNSAFE_END
1175
1176 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1177 UnsafeWrapper("Unsafe_PrefetchWrite");
1178 oop p = JNIHandles::resolve(obj);
1179 void* addr = index_oop_from_field_offset_long(p, 0);
1180 Prefetch::write(addr, (intx)offset);
1181 UNSAFE_END
1182
1183
1184 /// JVM_RegisterUnsafeMethods
1185
1186 #define ADR "J"
1187
1188 #define LANG "Ljava/lang/"
1189
1190 #define OBJ LANG"Object;"
1191 #define CLS LANG"Class;"
1192 #define CTR LANG"reflect/Constructor;"
1193 #define FLD LANG"reflect/Field;"
1194 #define MTH LANG"reflect/Method;"
1195 #define THR LANG"Throwable;"
1196
1197 #define DC0_Args LANG"String;[BII"
1198 #define DC1_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1199
1200 #define CC (char*) /*cast a literal from (const char*)*/
1201 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1202
1203 // define deprecated accessors for compabitility with 1.4.0
1204 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1205 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1206 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1207
1208 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1209 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1210 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1211 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1212
1213 // Note: In 1.5.0, there are volatile versions too
1214 #define DECLARE_GETSETOOP(Boolean, Z) \
1215 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1216 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1217 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1218 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1219
1220
1221 #define DECLARE_GETSETNATIVE(Byte, B) \
1222 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1223 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1224
1225
1226
1227 // %%% These are temporarily supported until the SDK sources
1228 // contain the necessarily updated Unsafe.java.
1229 static JNINativeMethod methods_140[] = {
1230
1231 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)},
1232 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)},
1233
1234 DECLARE_GETSETOOP_140(Boolean, Z),
1235 DECLARE_GETSETOOP_140(Byte, B),
1236 DECLARE_GETSETOOP_140(Short, S),
1237 DECLARE_GETSETOOP_140(Char, C),
1238 DECLARE_GETSETOOP_140(Int, I),
1239 DECLARE_GETSETOOP_140(Long, J),
1240 DECLARE_GETSETOOP_140(Float, F),
1241 DECLARE_GETSETOOP_140(Double, D),
1242
1243 DECLARE_GETSETNATIVE(Byte, B),
1244 DECLARE_GETSETNATIVE(Short, S),
1245 DECLARE_GETSETNATIVE(Char, C),
1246 DECLARE_GETSETNATIVE(Int, I),
1247 DECLARE_GETSETNATIVE(Long, J),
1248 DECLARE_GETSETNATIVE(Float, F),
1249 DECLARE_GETSETNATIVE(Double, D),
1250
1251 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1252 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1253
1254 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1255 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1256 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1257 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1258 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1259
1260 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, //deprecated
1261 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, //deprecated
1262 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1263 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1264 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1265 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1266 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1267
1268 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1269 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1270 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1271 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1272 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1273 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1274 };
1275
1276 // These are the old methods prior to the JSR 166 changes in 1.5.0
1277 static JNINativeMethod methods_141[] = {
1278
1279 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1280 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1281
1282 DECLARE_GETSETOOP_141(Boolean, Z),
1283 DECLARE_GETSETOOP_141(Byte, B),
1284 DECLARE_GETSETOOP_141(Short, S),
1285 DECLARE_GETSETOOP_141(Char, C),
1286 DECLARE_GETSETOOP_141(Int, I),
1287 DECLARE_GETSETOOP_141(Long, J),
1288 DECLARE_GETSETOOP_141(Float, F),
1289 DECLARE_GETSETOOP_141(Double, D),
1290
1291 DECLARE_GETSETNATIVE(Byte, B),
1292 DECLARE_GETSETNATIVE(Short, S),
1293 DECLARE_GETSETNATIVE(Char, C),
1294 DECLARE_GETSETNATIVE(Int, I),
1295 DECLARE_GETSETNATIVE(Long, J),
1296 DECLARE_GETSETNATIVE(Float, F),
1297 DECLARE_GETSETNATIVE(Double, D),
1298
1299 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1300 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1301
1302 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1303 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1304 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1305 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1306 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1307
1308 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1309 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1310 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1311 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1312 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1313 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1314 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1315 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1316
1317 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1318 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1319 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1320 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1321 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1322 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1323
1324 };
1325
1326 // These are the old methods prior to the JSR 166 changes in 1.6.0
1327 static JNINativeMethod methods_15[] = {
1328
1329 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1330 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1331 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1332 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1333
1334
1335 DECLARE_GETSETOOP(Boolean, Z),
1336 DECLARE_GETSETOOP(Byte, B),
1337 DECLARE_GETSETOOP(Short, S),
1338 DECLARE_GETSETOOP(Char, C),
1339 DECLARE_GETSETOOP(Int, I),
1340 DECLARE_GETSETOOP(Long, J),
1341 DECLARE_GETSETOOP(Float, F),
1342 DECLARE_GETSETOOP(Double, D),
1343
1344 DECLARE_GETSETNATIVE(Byte, B),
1345 DECLARE_GETSETNATIVE(Short, S),
1346 DECLARE_GETSETNATIVE(Char, C),
1347 DECLARE_GETSETNATIVE(Int, I),
1348 DECLARE_GETSETNATIVE(Long, J),
1349 DECLARE_GETSETNATIVE(Float, F),
1350 DECLARE_GETSETNATIVE(Double, D),
1351
1352 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1353 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1354
1355 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1356 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1357 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1358 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1359 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1360
1361 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1362 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1363 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1364 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1365 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1366 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1367 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1368 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1369
1370 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1371 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1372 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1373 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1374 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1375 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1376 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1377 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1378 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1379 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1380 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1381
1382 };
1383
1384 // These are the correct methods, moving forward:
1385 static JNINativeMethod methods[] = {
1386
1387 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1388 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1389 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1390 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1391
1392
1393 DECLARE_GETSETOOP(Boolean, Z),
1394 DECLARE_GETSETOOP(Byte, B),
1395 DECLARE_GETSETOOP(Short, S),
1396 DECLARE_GETSETOOP(Char, C),
1397 DECLARE_GETSETOOP(Int, I),
1398 DECLARE_GETSETOOP(Long, J),
1399 DECLARE_GETSETOOP(Float, F),
1400 DECLARE_GETSETOOP(Double, D),
1401
1402 DECLARE_GETSETNATIVE(Byte, B),
1403 DECLARE_GETSETNATIVE(Short, S),
1404 DECLARE_GETSETNATIVE(Char, C),
1405 DECLARE_GETSETNATIVE(Int, I),
1406 DECLARE_GETSETNATIVE(Long, J),
1407 DECLARE_GETSETNATIVE(Float, F),
1408 DECLARE_GETSETNATIVE(Double, D),
1409
1410 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1411 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1412
1413 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1414 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1415 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1416 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1417 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1418
1419 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1420 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1421 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1422 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1423 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1424 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1425 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1426 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1427
1428 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1429 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1430 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1431 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1432 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1433 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1434 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1435 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1436 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1437 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1438 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1439 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1440 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1441 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1442 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1443
1444 // {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)},
1445
1446 // {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1447 // {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1448 // {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1449 // {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1450
1451 };
1452
1453 JNINativeMethod loadavg_method[] = {
1454 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1455 };
1456
1457 JNINativeMethod prefetch_methods[] = {
1458 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1459 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1460 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1461 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1462 };
1463
1464 JNINativeMethod memcopy_methods[] = {
1465 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1466 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1467 };
1468
1469 JNINativeMethod memcopy_methods_15[] = {
1470 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1471 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1472 };
1473
1474 JNINativeMethod anonk_methods[] = {
1475 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1476 };
1477
1478 #undef CC
1479 #undef FN_PTR
1480
1481 #undef ADR
1482 #undef LANG
1483 #undef OBJ
1484 #undef CLS
1485 #undef CTR
1486 #undef FLD
1487 #undef MTH
1488 #undef THR
1489 #undef DC0_Args
1490 #undef DC1_Args
1491
1492 #undef DECLARE_GETSETOOP
1493 #undef DECLARE_GETSETNATIVE
1494
1495
1496 // This one function is exported, used by NativeLookup.
1497 // The Unsafe_xxx functions above are called only from the interpreter.
1498 // The optimizer looks at names and signatures to recognize
1499 // individual functions.
1500
1501 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1502 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1503 {
1504 ThreadToNativeFromVM ttnfv(thread);
1505 {
1506 env->RegisterNatives(unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1507 if (env->ExceptionOccurred()) {
1508 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1509 tty->print_cr("Warning: SDK 1.6 Unsafe.loadavg not found.");
1510 }
1511 env->ExceptionClear();
1512 }
1513 }
1514 {
1515 env->RegisterNatives(unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1516 if (env->ExceptionOccurred()) {
1517 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1518 tty->print_cr("Warning: SDK 1.6 Unsafe.prefetchRead/Write not found.");
1519 }
1520 env->ExceptionClear();
1521 }
1522 }
1523 {
1524 env->RegisterNatives(unsafecls, memcopy_methods, sizeof(memcopy_methods)/sizeof(JNINativeMethod));
1525 if (env->ExceptionOccurred()) {
1526 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1527 tty->print_cr("Warning: SDK 1.7 Unsafe.copyMemory not found.");
1528 }
1529 env->ExceptionClear();
1530 env->RegisterNatives(unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1531 if (env->ExceptionOccurred()) {
1532 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1533 tty->print_cr("Warning: SDK 1.5 Unsafe.copyMemory not found.");
1534 }
1535 env->ExceptionClear();
1536 }
1537 }
1538 }
1539 if (AnonymousClasses) {
1540 env->RegisterNatives(unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1541 if (env->ExceptionOccurred()) {
1542 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1543 tty->print_cr("Warning: SDK 1.7 Unsafe.defineClass (anonymous version) not found.");
1544 }
1545 env->ExceptionClear();
1546 }
1547 }
1548 int status = env->RegisterNatives(unsafecls, methods, sizeof(methods)/sizeof(JNINativeMethod));
1549 if (env->ExceptionOccurred()) {
1550 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1551 tty->print_cr("Warning: SDK 1.6 version of Unsafe not found.");
1552 }
1553 env->ExceptionClear();
1554 // %%% For now, be backward compatible with an older class:
1555 status = env->RegisterNatives(unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1556 }
1557 if (env->ExceptionOccurred()) {
1558 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1559 tty->print_cr("Warning: SDK 1.5 version of Unsafe not found.");
1560 }
1561 env->ExceptionClear();
1562 // %%% For now, be backward compatible with an older class:
1563 status = env->RegisterNatives(unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1564 }
1565 if (env->ExceptionOccurred()) {
1566 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1567 tty->print_cr("Warning: SDK 1.4.1 version of Unsafe not found.");
1568 }
1569 env->ExceptionClear();
1570 // %%% For now, be backward compatible with an older class:
1571 status = env->RegisterNatives(unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1572 }
1573 guarantee(status == 0, "register unsafe natives");
1574 }
1575 JVM_END