Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/prims/unsafe.cpp@bf8517f4e4d0
src/share/vm/prims/unsafe.cpp
Wed, 02 Feb 2011 14:38:01 -0500
- author
- kamg
- date
- Wed, 02 Feb 2011 14:38:01 -0500
- changeset 2511
- bf8517f4e4d0
- parent 2497
- 3582bf76420e
- child 2598
- d411927672ed
- permissions
- -rw-r--r--
6766644: Redefinition of compiled method fails with assertion "Can not load classes with the Compiler thread"
Summary: Defer posting events from the compiler thread: use service thread
Reviewed-by: coleenp, dholmes, never, dcubed
1 /*
2 * Copyright (c) 2000, 2011, 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 */
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"
39 /*
40 * Implementation of class sun.misc.Unsafe
41 */
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);
47 #define MAX_OBJECT_SIZE \
48 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
49 + ((julong)max_jint * sizeof(double)) )
52 #define UNSAFE_ENTRY(result_type, header) \
53 JVM_ENTRY(result_type, header)
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)
66 #define UNSAFE_END JVM_END
68 #define UnsafeWrapper(arg) /*nothing, for the present*/
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 }
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 }
85 // Note: The VM's obj_field and related accessors use byte-scaled
86 // ("unscaled") offsets, just as the unsafe methods do.
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.
95 inline jlong field_offset_to_byte_offset(jlong field_offset) {
96 return field_offset;
97 }
99 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
100 return byte_offset;
101 }
103 inline jint invocation_key_from_method_slot(jint slot) {
104 return slot;
105 }
107 inline jint invocation_key_to_method_slot(jint key) {
108 return key;
109 }
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 }
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 }
145 ///// Data in the Java heap.
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)
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
155 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
156 oop p = JNIHandles::resolve(obj); \
157 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
159 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
160 oop p = JNIHandles::resolve(obj); \
161 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x);
163 // Macros for oops that check UseCompressedOops
165 #define GET_OOP_FIELD(obj, offset, v) \
166 oop p = JNIHandles::resolve(obj); \
167 oop v; \
168 if (UseCompressedOops) { \
169 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
170 v = oopDesc::decode_heap_oop(n); \
171 } else { \
172 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
173 }
175 #define GET_OOP_FIELD_VOLATILE(obj, offset, v) \
176 oop p = JNIHandles::resolve(obj); \
177 volatile oop v; \
178 if (UseCompressedOops) { \
179 volatile narrowOop n = *(volatile narrowOop*)index_oop_from_field_offset_long(p, offset); \
180 v = oopDesc::decode_heap_oop(n); \
181 } else { \
182 v = *(volatile oop*)index_oop_from_field_offset_long(p, offset); \
183 } \
184 OrderAccess::acquire();
187 // Get/SetObject must be special-cased, since it works with handles.
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
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
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
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
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
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 void* addr = index_oop_from_field_offset_long(p, offset);
252 OrderAccess::release();
253 if (UseCompressedOops) {
254 oop_store((narrowOop*)addr, x);
255 } else {
256 oop_store((oop*)addr, x);
257 }
258 OrderAccess::fence();
259 UNSAFE_END
261 #if defined(SPARC) || defined(X86)
262 // Sparc and X86 have atomic jlong (8 bytes) instructions
264 #else
265 // Keep old code for platforms which may not have atomic jlong (8 bytes) instructions
267 // Volatile long versions must use locks if !VM_Version::supports_cx8().
268 // support_cx8 is a surrogate for 'supports atomic long memory ops'.
270 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
271 UnsafeWrapper("Unsafe_GetLongVolatile");
272 {
273 if (VM_Version::supports_cx8()) {
274 GET_FIELD_VOLATILE(obj, offset, jlong, v);
275 return v;
276 }
277 else {
278 Handle p (THREAD, JNIHandles::resolve(obj));
279 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
280 ObjectLocker ol(p, THREAD);
281 jlong value = *addr;
282 return value;
283 }
284 }
285 UNSAFE_END
287 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
288 UnsafeWrapper("Unsafe_SetLongVolatile");
289 {
290 if (VM_Version::supports_cx8()) {
291 SET_FIELD_VOLATILE(obj, offset, jlong, x);
292 }
293 else {
294 Handle p (THREAD, JNIHandles::resolve(obj));
295 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
296 ObjectLocker ol(p, THREAD);
297 *addr = x;
298 }
299 }
300 UNSAFE_END
302 #endif // not SPARC and not X86
304 #define DEFINE_GETSETOOP(jboolean, Boolean) \
305 \
306 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
307 UnsafeWrapper("Unsafe_Get"#Boolean); \
308 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
309 GET_FIELD(obj, offset, jboolean, v); \
310 return v; \
311 UNSAFE_END \
312 \
313 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
314 UnsafeWrapper("Unsafe_Set"#Boolean); \
315 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
316 SET_FIELD(obj, offset, jboolean, x); \
317 UNSAFE_END \
318 \
319 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
320 UnsafeWrapper("Unsafe_Get"#Boolean); \
321 GET_FIELD(obj, offset, jboolean, v); \
322 return v; \
323 UNSAFE_END \
324 \
325 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
326 UnsafeWrapper("Unsafe_Set"#Boolean); \
327 SET_FIELD(obj, offset, jboolean, x); \
328 UNSAFE_END \
329 \
330 // END DEFINE_GETSETOOP.
332 DEFINE_GETSETOOP(jboolean, Boolean)
333 DEFINE_GETSETOOP(jbyte, Byte)
334 DEFINE_GETSETOOP(jshort, Short);
335 DEFINE_GETSETOOP(jchar, Char);
336 DEFINE_GETSETOOP(jint, Int);
337 DEFINE_GETSETOOP(jlong, Long);
338 DEFINE_GETSETOOP(jfloat, Float);
339 DEFINE_GETSETOOP(jdouble, Double);
341 #undef DEFINE_GETSETOOP
343 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
344 \
345 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
346 UnsafeWrapper("Unsafe_Get"#Boolean); \
347 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
348 return v; \
349 UNSAFE_END \
350 \
351 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
352 UnsafeWrapper("Unsafe_Set"#Boolean); \
353 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
354 UNSAFE_END \
355 \
356 // END DEFINE_GETSETOOP_VOLATILE.
358 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
359 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
360 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
361 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
362 DEFINE_GETSETOOP_VOLATILE(jint, Int);
363 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
364 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
366 #if defined(SPARC) || defined(X86)
367 // Sparc and X86 have atomic jlong (8 bytes) instructions
368 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
369 #endif
371 #undef DEFINE_GETSETOOP_VOLATILE
373 // The non-intrinsified versions of setOrdered just use setVolatile
375 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
376 UnsafeWrapper("Unsafe_SetOrderedInt");
377 SET_FIELD_VOLATILE(obj, offset, jint, x);
378 UNSAFE_END
380 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
381 UnsafeWrapper("Unsafe_SetOrderedObject");
382 oop x = JNIHandles::resolve(x_h);
383 oop p = JNIHandles::resolve(obj);
384 void* addr = index_oop_from_field_offset_long(p, offset);
385 OrderAccess::release();
386 if (UseCompressedOops) {
387 oop_store((narrowOop*)addr, x);
388 } else {
389 oop_store((oop*)addr, x);
390 }
391 OrderAccess::fence();
392 UNSAFE_END
394 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
395 UnsafeWrapper("Unsafe_SetOrderedLong");
396 #if defined(SPARC) || defined(X86)
397 // Sparc and X86 have atomic jlong (8 bytes) instructions
398 SET_FIELD_VOLATILE(obj, offset, jlong, x);
399 #else
400 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
401 {
402 if (VM_Version::supports_cx8()) {
403 SET_FIELD_VOLATILE(obj, offset, jlong, x);
404 }
405 else {
406 Handle p (THREAD, JNIHandles::resolve(obj));
407 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
408 ObjectLocker ol(p, THREAD);
409 *addr = x;
410 }
411 }
412 #endif
413 UNSAFE_END
415 ////// Data in the C heap.
417 // Note: These do not throw NullPointerException for bad pointers.
418 // They just crash. Only a oop base pointer can generate a NullPointerException.
419 //
420 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
421 \
422 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
423 UnsafeWrapper("Unsafe_GetNative"#Type); \
424 void* p = addr_from_java(addr); \
425 JavaThread* t = JavaThread::current(); \
426 t->set_doing_unsafe_access(true); \
427 java_type x = *(volatile native_type*)p; \
428 t->set_doing_unsafe_access(false); \
429 return x; \
430 UNSAFE_END \
431 \
432 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
433 UnsafeWrapper("Unsafe_SetNative"#Type); \
434 JavaThread* t = JavaThread::current(); \
435 t->set_doing_unsafe_access(true); \
436 void* p = addr_from_java(addr); \
437 *(volatile native_type*)p = x; \
438 t->set_doing_unsafe_access(false); \
439 UNSAFE_END \
440 \
441 // END DEFINE_GETSETNATIVE.
443 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
444 DEFINE_GETSETNATIVE(jshort, Short, signed short);
445 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
446 DEFINE_GETSETNATIVE(jint, Int, jint);
447 // no long -- handled specially
448 DEFINE_GETSETNATIVE(jfloat, Float, float);
449 DEFINE_GETSETNATIVE(jdouble, Double, double);
451 #undef DEFINE_GETSETNATIVE
453 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
454 UnsafeWrapper("Unsafe_GetNativeLong");
455 JavaThread* t = JavaThread::current();
456 // We do it this way to avoid problems with access to heap using 64
457 // bit loads, as jlong in heap could be not 64-bit aligned, and on
458 // some CPUs (SPARC) it leads to SIGBUS.
459 t->set_doing_unsafe_access(true);
460 void* p = addr_from_java(addr);
461 jlong x;
462 if (((intptr_t)p & 7) == 0) {
463 // jlong is aligned, do a volatile access
464 x = *(volatile jlong*)p;
465 } else {
466 jlong_accessor acc;
467 acc.words[0] = ((volatile jint*)p)[0];
468 acc.words[1] = ((volatile jint*)p)[1];
469 x = acc.long_value;
470 }
471 t->set_doing_unsafe_access(false);
472 return x;
473 UNSAFE_END
475 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
476 UnsafeWrapper("Unsafe_SetNativeLong");
477 JavaThread* t = JavaThread::current();
478 // see comment for Unsafe_GetNativeLong
479 t->set_doing_unsafe_access(true);
480 void* p = addr_from_java(addr);
481 if (((intptr_t)p & 7) == 0) {
482 // jlong is aligned, do a volatile access
483 *(volatile jlong*)p = x;
484 } else {
485 jlong_accessor acc;
486 acc.long_value = x;
487 ((volatile jint*)p)[0] = acc.words[0];
488 ((volatile jint*)p)[1] = acc.words[1];
489 }
490 t->set_doing_unsafe_access(false);
491 UNSAFE_END
494 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
495 UnsafeWrapper("Unsafe_GetNativeAddress");
496 void* p = addr_from_java(addr);
497 return addr_to_java(*(void**)p);
498 UNSAFE_END
500 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
501 UnsafeWrapper("Unsafe_SetNativeAddress");
502 void* p = addr_from_java(addr);
503 *(void**)p = addr_from_java(x);
504 UNSAFE_END
507 ////// Allocation requests
509 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
510 UnsafeWrapper("Unsafe_AllocateInstance");
511 {
512 ThreadToNativeFromVM ttnfv(thread);
513 return env->AllocObject(cls);
514 }
515 UNSAFE_END
517 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
518 UnsafeWrapper("Unsafe_AllocateMemory");
519 size_t sz = (size_t)size;
520 if (sz != (julong)size || size < 0) {
521 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
522 }
523 if (sz == 0) {
524 return 0;
525 }
526 sz = round_to(sz, HeapWordSize);
527 void* x = os::malloc(sz);
528 if (x == NULL) {
529 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
530 }
531 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
532 return addr_to_java(x);
533 UNSAFE_END
535 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
536 UnsafeWrapper("Unsafe_ReallocateMemory");
537 void* p = addr_from_java(addr);
538 size_t sz = (size_t)size;
539 if (sz != (julong)size || size < 0) {
540 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
541 }
542 if (sz == 0) {
543 os::free(p);
544 return 0;
545 }
546 sz = round_to(sz, HeapWordSize);
547 void* x = (p == NULL) ? os::malloc(sz) : os::realloc(p, sz);
548 if (x == NULL) {
549 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
550 }
551 return addr_to_java(x);
552 UNSAFE_END
554 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
555 UnsafeWrapper("Unsafe_FreeMemory");
556 void* p = addr_from_java(addr);
557 if (p == NULL) {
558 return;
559 }
560 os::free(p);
561 UNSAFE_END
563 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
564 UnsafeWrapper("Unsafe_SetMemory");
565 size_t sz = (size_t)size;
566 if (sz != (julong)size || size < 0) {
567 THROW(vmSymbols::java_lang_IllegalArgumentException());
568 }
569 char* p = (char*) addr_from_java(addr);
570 Copy::fill_to_memory_atomic(p, sz, value);
571 UNSAFE_END
573 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
574 UnsafeWrapper("Unsafe_SetMemory");
575 size_t sz = (size_t)size;
576 if (sz != (julong)size || size < 0) {
577 THROW(vmSymbols::java_lang_IllegalArgumentException());
578 }
579 oop base = JNIHandles::resolve(obj);
580 void* p = index_oop_from_field_offset_long(base, offset);
581 Copy::fill_to_memory_atomic(p, sz, value);
582 UNSAFE_END
584 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
585 UnsafeWrapper("Unsafe_CopyMemory");
586 if (size == 0) {
587 return;
588 }
589 size_t sz = (size_t)size;
590 if (sz != (julong)size || size < 0) {
591 THROW(vmSymbols::java_lang_IllegalArgumentException());
592 }
593 void* src = addr_from_java(srcAddr);
594 void* dst = addr_from_java(dstAddr);
595 Copy::conjoint_memory_atomic(src, dst, sz);
596 UNSAFE_END
598 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
599 UnsafeWrapper("Unsafe_CopyMemory");
600 if (size == 0) {
601 return;
602 }
603 size_t sz = (size_t)size;
604 if (sz != (julong)size || size < 0) {
605 THROW(vmSymbols::java_lang_IllegalArgumentException());
606 }
607 oop srcp = JNIHandles::resolve(srcObj);
608 oop dstp = JNIHandles::resolve(dstObj);
609 if (dstp != NULL && !dstp->is_typeArray()) {
610 // NYI: This works only for non-oop arrays at present.
611 // Generalizing it would be reasonable, but requires card marking.
612 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
613 THROW(vmSymbols::java_lang_IllegalArgumentException());
614 }
615 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
616 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
617 Copy::conjoint_memory_atomic(src, dst, sz);
618 UNSAFE_END
621 ////// Random queries
623 // See comment at file start about UNSAFE_LEAF
624 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
625 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
626 UnsafeWrapper("Unsafe_AddressSize");
627 return sizeof(void*);
628 UNSAFE_END
630 // See comment at file start about UNSAFE_LEAF
631 //UNSAFE_LEAF(jint, Unsafe_PageSize())
632 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
633 UnsafeWrapper("Unsafe_PageSize");
634 return os::vm_page_size();
635 UNSAFE_END
637 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
638 if (field == NULL) {
639 THROW_0(vmSymbols::java_lang_NullPointerException());
640 }
642 oop reflected = JNIHandles::resolve_non_null(field);
643 oop mirror = java_lang_reflect_Field::clazz(reflected);
644 klassOop k = java_lang_Class::as_klassOop(mirror);
645 int slot = java_lang_reflect_Field::slot(reflected);
646 int modifiers = java_lang_reflect_Field::modifiers(reflected);
648 if (must_be_static >= 0) {
649 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
650 if (must_be_static != really_is_static) {
651 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
652 }
653 }
655 int offset = instanceKlass::cast(k)->offset_from_fields(slot);
656 return field_offset_from_byte_offset(offset);
657 }
659 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
660 UnsafeWrapper("Unsafe_ObjectFieldOffset");
661 return find_field_offset(field, 0, THREAD);
662 UNSAFE_END
664 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
665 UnsafeWrapper("Unsafe_StaticFieldOffset");
666 return find_field_offset(field, 1, THREAD);
667 UNSAFE_END
669 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
670 UnsafeWrapper("Unsafe_StaticFieldBase");
671 // Note: In this VM implementation, a field address is always a short
672 // offset from the base of a a klass metaobject. Thus, the full dynamic
673 // range of the return type is never used. However, some implementations
674 // might put the static field inside an array shared by many classes,
675 // or even at a fixed address, in which case the address could be quite
676 // large. In that last case, this function would return NULL, since
677 // the address would operate alone, without any base pointer.
679 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
681 oop reflected = JNIHandles::resolve_non_null(field);
682 oop mirror = java_lang_reflect_Field::clazz(reflected);
683 int modifiers = java_lang_reflect_Field::modifiers(reflected);
685 if ((modifiers & JVM_ACC_STATIC) == 0) {
686 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
687 }
689 return JNIHandles::make_local(env, java_lang_Class::as_klassOop(mirror));
690 UNSAFE_END
692 //@deprecated
693 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
694 UnsafeWrapper("Unsafe_FieldOffset");
695 // tries (but fails) to be polymorphic between static and non-static:
696 jlong offset = find_field_offset(field, -1, THREAD);
697 guarantee(offset == (jint)offset, "offset fits in 32 bits");
698 return (jint)offset;
699 UNSAFE_END
701 //@deprecated
702 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
703 UnsafeWrapper("Unsafe_StaticFieldBase");
704 if (clazz == NULL) {
705 THROW_0(vmSymbols::java_lang_NullPointerException());
706 }
707 return JNIHandles::make_local(env, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
708 UNSAFE_END
710 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz))
711 UnsafeWrapper("Unsafe_EnsureClassInitialized");
712 if (clazz == NULL) {
713 THROW(vmSymbols::java_lang_NullPointerException());
714 }
715 oop mirror = JNIHandles::resolve_non_null(clazz);
716 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(mirror));
717 if (k != NULL) {
718 k->initialize(CHECK);
719 }
720 UNSAFE_END
722 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
723 if (acls == NULL) {
724 THROW(vmSymbols::java_lang_NullPointerException());
725 }
726 oop mirror = JNIHandles::resolve_non_null(acls);
727 klassOop k = java_lang_Class::as_klassOop(mirror);
728 if (k == NULL || !k->klass_part()->oop_is_array()) {
729 THROW(vmSymbols::java_lang_InvalidClassException());
730 } else if (k->klass_part()->oop_is_objArray()) {
731 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
732 scale = heapOopSize;
733 } else if (k->klass_part()->oop_is_typeArray()) {
734 typeArrayKlass* tak = typeArrayKlass::cast(k);
735 base = tak->array_header_in_bytes();
736 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
737 scale = (1 << tak->log2_element_size());
738 } else {
739 ShouldNotReachHere();
740 }
741 }
743 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
744 UnsafeWrapper("Unsafe_ArrayBaseOffset");
745 int base, scale;
746 getBaseAndScale(base, scale, acls, CHECK_0);
747 return field_offset_from_byte_offset(base);
748 UNSAFE_END
751 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
752 UnsafeWrapper("Unsafe_ArrayIndexScale");
753 int base, scale;
754 getBaseAndScale(base, scale, acls, CHECK_0);
755 // This VM packs both fields and array elements down to the byte.
756 // But watch out: If this changes, so that array references for
757 // a given primitive type (say, T_BOOLEAN) use different memory units
758 // than fields, this method MUST return zero for such arrays.
759 // For example, the VM used to store sub-word sized fields in full
760 // words in the object layout, so that accessors like getByte(Object,int)
761 // did not really do what one might expect for arrays. Therefore,
762 // this function used to report a zero scale factor, so that the user
763 // would know not to attempt to access sub-word array elements.
764 // // Code for unpacked fields:
765 // if (scale < wordSize) return 0;
767 // The following allows for a pretty general fieldOffset cookie scheme,
768 // but requires it to be linear in byte offset.
769 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
770 UNSAFE_END
773 static inline void throw_new(JNIEnv *env, const char *ename) {
774 char buf[100];
775 strcpy(buf, "java/lang/");
776 strcat(buf, ename);
777 jclass cls = env->FindClass(buf);
778 char* msg = NULL;
779 env->ThrowNew(cls, msg);
780 }
782 static jclass Unsafe_DefineClass(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
783 {
784 // Code lifted from JDK 1.3 ClassLoader.c
786 jbyte *body;
787 char *utfName;
788 jclass result = 0;
789 char buf[128];
791 if (UsePerfData) {
792 ClassLoader::unsafe_defineClassCallCounter()->inc();
793 }
795 if (data == NULL) {
796 throw_new(env, "NullPointerException");
797 return 0;
798 }
800 /* Work around 4153825. malloc crashes on Solaris when passed a
801 * negative size.
802 */
803 if (length < 0) {
804 throw_new(env, "ArrayIndexOutOfBoundsException");
805 return 0;
806 }
808 body = NEW_C_HEAP_ARRAY(jbyte, length);
810 if (body == 0) {
811 throw_new(env, "OutOfMemoryError");
812 return 0;
813 }
815 env->GetByteArrayRegion(data, offset, length, body);
817 if (env->ExceptionOccurred())
818 goto free_body;
820 if (name != NULL) {
821 uint len = env->GetStringUTFLength(name);
822 int unicode_len = env->GetStringLength(name);
823 if (len >= sizeof(buf)) {
824 utfName = NEW_C_HEAP_ARRAY(char, len + 1);
825 if (utfName == NULL) {
826 throw_new(env, "OutOfMemoryError");
827 goto free_body;
828 }
829 } else {
830 utfName = buf;
831 }
832 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
833 //VerifyFixClassname(utfName);
834 for (uint i = 0; i < len; i++) {
835 if (utfName[i] == '.') utfName[i] = '/';
836 }
837 } else {
838 utfName = NULL;
839 }
841 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
843 if (utfName && utfName != buf)
844 FREE_C_HEAP_ARRAY(char, utfName);
846 free_body:
847 FREE_C_HEAP_ARRAY(jbyte, body);
848 return result;
849 }
850 }
853 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
854 UnsafeWrapper("Unsafe_DefineClass");
855 {
856 ThreadToNativeFromVM ttnfv(thread);
858 int depthFromDefineClass0 = 1;
859 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
860 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
861 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
863 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
864 }
865 UNSAFE_END
868 UNSAFE_ENTRY(jclass, Unsafe_DefineClass1(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
869 UnsafeWrapper("Unsafe_DefineClass");
870 {
871 ThreadToNativeFromVM ttnfv(thread);
873 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
874 }
875 UNSAFE_END
877 #define DAC_Args CLS"[B["OBJ
878 // define a class but do not make it known to the class loader or system dictionary
879 // - host_class: supplies context for linkage, access control, protection domain, and class loader
880 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
881 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
883 // When you load an anonymous class U, it works as if you changed its name just before loading,
884 // to a name that you will never use again. Since the name is lost, no other class can directly
885 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
886 // through java.lang.Class methods like Class.newInstance.
888 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
889 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
890 // An anonymous class also has special privileges to access any member of its host class.
891 // This is the main reason why this loading operation is unsafe. The purpose of this is to
892 // allow language implementations to simulate "open classes"; a host class in effect gets
893 // new code when an anonymous class is loaded alongside it. A less convenient but more
894 // standard way to do this is with reflection, which can also be set to ignore access
895 // restrictions.
897 // Access into an anonymous class is possible only through reflection. Therefore, there
898 // are no special access rules for calling into an anonymous class. The relaxed access
899 // rule for the host class is applied in the opposite direction: A host class reflectively
900 // access one of its anonymous classes.
902 // If you load the same bytecodes twice, you get two different classes. You can reload
903 // the same bytecodes with or without varying CP patches.
905 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
906 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
907 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
909 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
910 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
911 // It is not possible for a named class, or an older anonymous class, to refer by
912 // name (via its CP) to a newer anonymous class.
914 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
915 // or type descriptors used in the loaded anonymous class.
917 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
918 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
919 // be changed to println(greeting), where greeting is an arbitrary object created before
920 // the anonymous class is loaded. This is useful in dynamic languages, in which
921 // various kinds of metaobjects must be introduced as constants into bytecode.
922 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
923 // not just a literal string. For such ldc instructions, the verifier uses the
924 // type Object instead of String, if the loaded constant is not in fact a String.
926 static oop
927 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
928 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
929 HeapWord* *temp_alloc,
930 TRAPS) {
932 if (UsePerfData) {
933 ClassLoader::unsafe_defineClassCallCounter()->inc();
934 }
936 if (data == NULL) {
937 THROW_0(vmSymbols::java_lang_NullPointerException());
938 }
940 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
941 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
942 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length);
943 if (body == NULL) {
944 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
945 }
947 // caller responsible to free it:
948 (*temp_alloc) = body;
950 {
951 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
952 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
953 }
955 u1* class_bytes = (u1*) body;
956 int class_bytes_length = (int) length;
957 if (class_bytes_length < 0) class_bytes_length = 0;
958 if (class_bytes == NULL
959 || host_class == NULL
960 || length != class_bytes_length)
961 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
963 objArrayHandle cp_patches_h;
964 if (cp_patches_jh != NULL) {
965 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
966 if (!p->is_objArray())
967 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
968 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
969 }
971 KlassHandle host_klass(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(host_class)));
972 const char* host_source = host_klass->external_name();
973 Handle host_loader(THREAD, host_klass->class_loader());
974 Handle host_domain(THREAD, host_klass->protection_domain());
976 GrowableArray<Handle>* cp_patches = NULL;
977 if (cp_patches_h.not_null()) {
978 int alen = cp_patches_h->length();
979 for (int i = alen-1; i >= 0; i--) {
980 oop p = cp_patches_h->obj_at(i);
981 if (p != NULL) {
982 Handle patch(THREAD, p);
983 if (cp_patches == NULL)
984 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
985 cp_patches->at_put(i, patch);
986 }
987 }
988 }
990 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
992 instanceKlassHandle anon_klass;
993 {
994 Symbol* no_class_name = NULL;
995 klassOop anonk = SystemDictionary::parse_stream(no_class_name,
996 host_loader, host_domain,
997 &st, host_klass, cp_patches,
998 CHECK_NULL);
999 if (anonk == NULL) return NULL;
1000 anon_klass = instanceKlassHandle(THREAD, anonk);
1001 }
1003 // let caller initialize it as needed...
1005 return anon_klass->java_mirror();
1006 }
1008 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1009 {
1010 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1011 ResourceMark rm(THREAD);
1013 HeapWord* temp_alloc = NULL;
1015 jobject res_jh = NULL;
1017 { oop res_oop = Unsafe_DefineAnonymousClass_impl(env,
1018 host_class, data, cp_patches_jh,
1019 &temp_alloc, THREAD);
1020 if (res_oop != NULL)
1021 res_jh = JNIHandles::make_local(env, res_oop);
1022 }
1024 // try/finally clause:
1025 if (temp_alloc != NULL) {
1026 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc);
1027 }
1029 return (jclass) res_jh;
1030 }
1031 UNSAFE_END
1035 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1036 UnsafeWrapper("Unsafe_MonitorEnter");
1037 {
1038 if (jobj == NULL) {
1039 THROW(vmSymbols::java_lang_NullPointerException());
1040 }
1041 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1042 ObjectSynchronizer::jni_enter(obj, CHECK);
1043 }
1044 UNSAFE_END
1047 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1048 UnsafeWrapper("Unsafe_TryMonitorEnter");
1049 {
1050 if (jobj == NULL) {
1051 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1052 }
1053 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1054 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1055 return (res ? JNI_TRUE : JNI_FALSE);
1056 }
1057 UNSAFE_END
1060 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1061 UnsafeWrapper("Unsafe_MonitorExit");
1062 {
1063 if (jobj == NULL) {
1064 THROW(vmSymbols::java_lang_NullPointerException());
1065 }
1066 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1067 ObjectSynchronizer::jni_exit(obj(), CHECK);
1068 }
1069 UNSAFE_END
1072 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1073 UnsafeWrapper("Unsafe_ThrowException");
1074 {
1075 ThreadToNativeFromVM ttnfv(thread);
1076 env->Throw(thr);
1077 }
1078 UNSAFE_END
1080 // JSR166 ------------------------------------------------------------------
1082 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1083 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1084 oop x = JNIHandles::resolve(x_h);
1085 oop e = JNIHandles::resolve(e_h);
1086 oop p = JNIHandles::resolve(obj);
1087 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1088 if (UseCompressedOops) {
1089 update_barrier_set_pre((narrowOop*)addr, e);
1090 } else {
1091 update_barrier_set_pre((oop*)addr, e);
1092 }
1093 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e);
1094 jboolean success = (res == e);
1095 if (success)
1096 update_barrier_set((void*)addr, x);
1097 return success;
1098 UNSAFE_END
1100 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1101 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1102 oop p = JNIHandles::resolve(obj);
1103 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1104 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1105 UNSAFE_END
1107 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1108 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1109 Handle p (THREAD, JNIHandles::resolve(obj));
1110 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1111 if (VM_Version::supports_cx8())
1112 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1113 else {
1114 jboolean success = false;
1115 ObjectLocker ol(p, THREAD);
1116 if (*addr == e) { *addr = x; success = true; }
1117 return success;
1118 }
1119 UNSAFE_END
1121 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1122 UnsafeWrapper("Unsafe_Park");
1123 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1124 JavaThreadParkedState jtps(thread, time != 0);
1125 thread->parker()->park(isAbsolute != 0, time);
1126 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1127 UNSAFE_END
1129 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1130 UnsafeWrapper("Unsafe_Unpark");
1131 Parker* p = NULL;
1132 if (jthread != NULL) {
1133 oop java_thread = JNIHandles::resolve_non_null(jthread);
1134 if (java_thread != NULL) {
1135 jlong lp = java_lang_Thread::park_event(java_thread);
1136 if (lp != 0) {
1137 // This cast is OK even though the jlong might have been read
1138 // non-atomically on 32bit systems, since there, one word will
1139 // always be zero anyway and the value set is always the same
1140 p = (Parker*)addr_from_java(lp);
1141 } else {
1142 // Grab lock if apparently null or using older version of library
1143 MutexLocker mu(Threads_lock);
1144 java_thread = JNIHandles::resolve_non_null(jthread);
1145 if (java_thread != NULL) {
1146 JavaThread* thr = java_lang_Thread::thread(java_thread);
1147 if (thr != NULL) {
1148 p = thr->parker();
1149 if (p != NULL) { // Bind to Java thread for next time.
1150 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1151 }
1152 }
1153 }
1154 }
1155 }
1156 }
1157 if (p != NULL) {
1158 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1159 p->unpark();
1160 }
1161 UNSAFE_END
1163 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1164 UnsafeWrapper("Unsafe_Loadavg");
1165 const int max_nelem = 3;
1166 double la[max_nelem];
1167 jint ret;
1169 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1170 assert(a->is_typeArray(), "must be type array");
1172 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1173 ThreadToNativeFromVM ttnfv(thread);
1174 throw_new(env, "ArrayIndexOutOfBoundsException");
1175 return -1;
1176 }
1178 ret = os::loadavg(la, nelem);
1179 if (ret == -1) return -1;
1181 // if successful, ret is the number of samples actually retrieved.
1182 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1183 switch(ret) {
1184 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1185 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1186 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1187 }
1188 return ret;
1189 UNSAFE_END
1191 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1192 UnsafeWrapper("Unsafe_PrefetchRead");
1193 oop p = JNIHandles::resolve(obj);
1194 void* addr = index_oop_from_field_offset_long(p, 0);
1195 Prefetch::read(addr, (intx)offset);
1196 UNSAFE_END
1198 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1199 UnsafeWrapper("Unsafe_PrefetchWrite");
1200 oop p = JNIHandles::resolve(obj);
1201 void* addr = index_oop_from_field_offset_long(p, 0);
1202 Prefetch::write(addr, (intx)offset);
1203 UNSAFE_END
1206 /// JVM_RegisterUnsafeMethods
1208 #define ADR "J"
1210 #define LANG "Ljava/lang/"
1212 #define OBJ LANG"Object;"
1213 #define CLS LANG"Class;"
1214 #define CTR LANG"reflect/Constructor;"
1215 #define FLD LANG"reflect/Field;"
1216 #define MTH LANG"reflect/Method;"
1217 #define THR LANG"Throwable;"
1219 #define DC0_Args LANG"String;[BII"
1220 #define DC1_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1222 #define CC (char*) /*cast a literal from (const char*)*/
1223 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1225 // define deprecated accessors for compabitility with 1.4.0
1226 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1227 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1228 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1230 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1231 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1232 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1233 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1235 // Note: In 1.5.0, there are volatile versions too
1236 #define DECLARE_GETSETOOP(Boolean, Z) \
1237 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1238 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1239 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1240 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1243 #define DECLARE_GETSETNATIVE(Byte, B) \
1244 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1245 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1249 // %%% These are temporarily supported until the SDK sources
1250 // contain the necessarily updated Unsafe.java.
1251 static JNINativeMethod methods_140[] = {
1253 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)},
1254 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)},
1256 DECLARE_GETSETOOP_140(Boolean, Z),
1257 DECLARE_GETSETOOP_140(Byte, B),
1258 DECLARE_GETSETOOP_140(Short, S),
1259 DECLARE_GETSETOOP_140(Char, C),
1260 DECLARE_GETSETOOP_140(Int, I),
1261 DECLARE_GETSETOOP_140(Long, J),
1262 DECLARE_GETSETOOP_140(Float, F),
1263 DECLARE_GETSETOOP_140(Double, D),
1265 DECLARE_GETSETNATIVE(Byte, B),
1266 DECLARE_GETSETNATIVE(Short, S),
1267 DECLARE_GETSETNATIVE(Char, C),
1268 DECLARE_GETSETNATIVE(Int, I),
1269 DECLARE_GETSETNATIVE(Long, J),
1270 DECLARE_GETSETNATIVE(Float, F),
1271 DECLARE_GETSETNATIVE(Double, D),
1273 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1274 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1276 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1277 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1278 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1279 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1280 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1282 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, //deprecated
1283 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, //deprecated
1284 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1285 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1286 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1287 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1288 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1290 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1291 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1292 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1293 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1294 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1295 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1296 };
1298 // These are the old methods prior to the JSR 166 changes in 1.5.0
1299 static JNINativeMethod methods_141[] = {
1301 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1302 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1304 DECLARE_GETSETOOP_141(Boolean, Z),
1305 DECLARE_GETSETOOP_141(Byte, B),
1306 DECLARE_GETSETOOP_141(Short, S),
1307 DECLARE_GETSETOOP_141(Char, C),
1308 DECLARE_GETSETOOP_141(Int, I),
1309 DECLARE_GETSETOOP_141(Long, J),
1310 DECLARE_GETSETOOP_141(Float, F),
1311 DECLARE_GETSETOOP_141(Double, D),
1313 DECLARE_GETSETNATIVE(Byte, B),
1314 DECLARE_GETSETNATIVE(Short, S),
1315 DECLARE_GETSETNATIVE(Char, C),
1316 DECLARE_GETSETNATIVE(Int, I),
1317 DECLARE_GETSETNATIVE(Long, J),
1318 DECLARE_GETSETNATIVE(Float, F),
1319 DECLARE_GETSETNATIVE(Double, D),
1321 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1322 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1324 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1325 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1326 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1327 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1328 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1330 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1331 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1332 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1333 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1334 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1335 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1336 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1337 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1339 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1340 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1341 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1342 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1343 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1344 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1346 };
1348 // These are the old methods prior to the JSR 166 changes in 1.6.0
1349 static JNINativeMethod methods_15[] = {
1351 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1352 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1353 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1354 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1357 DECLARE_GETSETOOP(Boolean, Z),
1358 DECLARE_GETSETOOP(Byte, B),
1359 DECLARE_GETSETOOP(Short, S),
1360 DECLARE_GETSETOOP(Char, C),
1361 DECLARE_GETSETOOP(Int, I),
1362 DECLARE_GETSETOOP(Long, J),
1363 DECLARE_GETSETOOP(Float, F),
1364 DECLARE_GETSETOOP(Double, D),
1366 DECLARE_GETSETNATIVE(Byte, B),
1367 DECLARE_GETSETNATIVE(Short, S),
1368 DECLARE_GETSETNATIVE(Char, C),
1369 DECLARE_GETSETNATIVE(Int, I),
1370 DECLARE_GETSETNATIVE(Long, J),
1371 DECLARE_GETSETNATIVE(Float, F),
1372 DECLARE_GETSETNATIVE(Double, D),
1374 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1375 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1377 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1378 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1379 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1380 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1381 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1383 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1384 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1385 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1386 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1387 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1388 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1389 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1390 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1392 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1393 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1394 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1395 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1396 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1397 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1398 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1399 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1400 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1401 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1402 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1404 };
1406 // These are the correct methods, moving forward:
1407 static JNINativeMethod methods[] = {
1409 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1410 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1411 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1412 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1415 DECLARE_GETSETOOP(Boolean, Z),
1416 DECLARE_GETSETOOP(Byte, B),
1417 DECLARE_GETSETOOP(Short, S),
1418 DECLARE_GETSETOOP(Char, C),
1419 DECLARE_GETSETOOP(Int, I),
1420 DECLARE_GETSETOOP(Long, J),
1421 DECLARE_GETSETOOP(Float, F),
1422 DECLARE_GETSETOOP(Double, D),
1424 DECLARE_GETSETNATIVE(Byte, B),
1425 DECLARE_GETSETNATIVE(Short, S),
1426 DECLARE_GETSETNATIVE(Char, C),
1427 DECLARE_GETSETNATIVE(Int, I),
1428 DECLARE_GETSETNATIVE(Long, J),
1429 DECLARE_GETSETNATIVE(Float, F),
1430 DECLARE_GETSETNATIVE(Double, D),
1432 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1433 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1435 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1436 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1437 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1438 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1439 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1441 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1442 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1443 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1444 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1445 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1446 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1447 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1448 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1450 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1451 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1452 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1453 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1454 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1455 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1456 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1457 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1458 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1459 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1460 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1461 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1462 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1463 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1464 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1466 // {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)},
1468 // {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1469 // {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1470 // {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1471 // {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1473 };
1475 JNINativeMethod loadavg_method[] = {
1476 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1477 };
1479 JNINativeMethod prefetch_methods[] = {
1480 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1481 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1482 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1483 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1484 };
1486 JNINativeMethod memcopy_methods[] = {
1487 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1488 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1489 };
1491 JNINativeMethod memcopy_methods_15[] = {
1492 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1493 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1494 };
1496 JNINativeMethod anonk_methods[] = {
1497 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1498 };
1500 #undef CC
1501 #undef FN_PTR
1503 #undef ADR
1504 #undef LANG
1505 #undef OBJ
1506 #undef CLS
1507 #undef CTR
1508 #undef FLD
1509 #undef MTH
1510 #undef THR
1511 #undef DC0_Args
1512 #undef DC1_Args
1514 #undef DECLARE_GETSETOOP
1515 #undef DECLARE_GETSETNATIVE
1518 // This one function is exported, used by NativeLookup.
1519 // The Unsafe_xxx functions above are called only from the interpreter.
1520 // The optimizer looks at names and signatures to recognize
1521 // individual functions.
1523 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1524 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1525 {
1526 ThreadToNativeFromVM ttnfv(thread);
1527 {
1528 env->RegisterNatives(unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1529 if (env->ExceptionOccurred()) {
1530 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1531 tty->print_cr("Warning: SDK 1.6 Unsafe.loadavg not found.");
1532 }
1533 env->ExceptionClear();
1534 }
1535 }
1536 {
1537 env->RegisterNatives(unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1538 if (env->ExceptionOccurred()) {
1539 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1540 tty->print_cr("Warning: SDK 1.6 Unsafe.prefetchRead/Write not found.");
1541 }
1542 env->ExceptionClear();
1543 }
1544 }
1545 {
1546 env->RegisterNatives(unsafecls, memcopy_methods, sizeof(memcopy_methods)/sizeof(JNINativeMethod));
1547 if (env->ExceptionOccurred()) {
1548 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1549 tty->print_cr("Warning: SDK 1.7 Unsafe.copyMemory not found.");
1550 }
1551 env->ExceptionClear();
1552 env->RegisterNatives(unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1553 if (env->ExceptionOccurred()) {
1554 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1555 tty->print_cr("Warning: SDK 1.5 Unsafe.copyMemory not found.");
1556 }
1557 env->ExceptionClear();
1558 }
1559 }
1560 }
1561 if (AnonymousClasses) {
1562 env->RegisterNatives(unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1563 if (env->ExceptionOccurred()) {
1564 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1565 tty->print_cr("Warning: SDK 1.7 Unsafe.defineClass (anonymous version) not found.");
1566 }
1567 env->ExceptionClear();
1568 }
1569 }
1570 int status = env->RegisterNatives(unsafecls, methods, sizeof(methods)/sizeof(JNINativeMethod));
1571 if (env->ExceptionOccurred()) {
1572 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1573 tty->print_cr("Warning: SDK 1.6 version of Unsafe not found.");
1574 }
1575 env->ExceptionClear();
1576 // %%% For now, be backward compatible with an older class:
1577 status = env->RegisterNatives(unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1578 }
1579 if (env->ExceptionOccurred()) {
1580 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1581 tty->print_cr("Warning: SDK 1.5 version of Unsafe not found.");
1582 }
1583 env->ExceptionClear();
1584 // %%% For now, be backward compatible with an older class:
1585 status = env->RegisterNatives(unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1586 }
1587 if (env->ExceptionOccurred()) {
1588 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1589 tty->print_cr("Warning: SDK 1.4.1 version of Unsafe not found.");
1590 }
1591 env->ExceptionClear();
1592 // %%% For now, be backward compatible with an older class:
1593 status = env->RegisterNatives(unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1594 }
1595 guarantee(status == 0, "register unsafe natives");
1596 }
1597 JVM_END
