Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/prims/unsafe.cpp@6a93908f268f
src/share/vm/prims/unsafe.cpp
Fri, 10 Jul 2009 11:10:00 -0700
- author
- mchung
- date
- Fri, 10 Jul 2009 11:10:00 -0700
- changeset 1310
- 6a93908f268f
- parent 866
- a45484ea312d
- child 1280
- df6caf649ff7
- permissions
- -rw-r--r--
6857194: Add hotspot perf counters to aid class loading performance measurement
Summary: Add new jvmstat counters to measure detailed class loading time
Reviewed-by: acorn, kamg
1 /*
2 * Copyright 2000-2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 /*
26 * Implementation of class sun.misc.Unsafe
27 */
29 #include "incls/_precompiled.incl"
30 #include "incls/_unsafe.cpp.incl"
32 #define MAX_OBJECT_SIZE \
33 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
34 + ((julong)max_jint * sizeof(double)) )
37 #define UNSAFE_ENTRY(result_type, header) \
38 JVM_ENTRY(result_type, header)
40 // Can't use UNSAFE_LEAF because it has the signature of a straight
41 // call into the runtime (just like JVM_LEAF, funny that) but it's
42 // called like a Java Native and thus the wrapper built for it passes
43 // arguments like a JNI call. It expects those arguments to be popped
44 // from the stack on Intel like all good JNI args are, and adjusts the
45 // stack according. Since the JVM_LEAF call expects no extra
46 // arguments the stack isn't popped in the C code, is pushed by the
47 // wrapper and we get sick.
48 //#define UNSAFE_LEAF(result_type, header) \
49 // JVM_LEAF(result_type, header)
51 #define UNSAFE_END JVM_END
53 #define UnsafeWrapper(arg) /*nothing, for the present*/
56 inline void* addr_from_java(jlong addr) {
57 // This assert fails in a variety of ways on 32-bit systems.
58 // It is impossible to predict whether native code that converts
59 // pointers to longs will sign-extend or zero-extend the addresses.
60 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
61 return (void*)(uintptr_t)addr;
62 }
64 inline jlong addr_to_java(void* p) {
65 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
66 return (uintptr_t)p;
67 }
70 // Note: The VM's obj_field and related accessors use byte-scaled
71 // ("unscaled") offsets, just as the unsafe methods do.
73 // However, the method Unsafe.fieldOffset explicitly declines to
74 // guarantee this. The field offset values manipulated by the Java user
75 // through the Unsafe API are opaque cookies that just happen to be byte
76 // offsets. We represent this state of affairs by passing the cookies
77 // through conversion functions when going between the VM and the Unsafe API.
78 // The conversion functions just happen to be no-ops at present.
80 inline jlong field_offset_to_byte_offset(jlong field_offset) {
81 return field_offset;
82 }
84 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
85 return byte_offset;
86 }
88 inline jint invocation_key_from_method_slot(jint slot) {
89 return slot;
90 }
92 inline jint invocation_key_to_method_slot(jint key) {
93 return key;
94 }
96 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
97 jlong byte_offset = field_offset_to_byte_offset(field_offset);
98 #ifdef ASSERT
99 if (p != NULL) {
100 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
101 if (byte_offset == (jint)byte_offset) {
102 void* ptr_plus_disp = (address)p + byte_offset;
103 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
104 "raw [ptr+disp] must be consistent with oop::field_base");
105 }
106 }
107 #endif
108 if (sizeof(char*) == sizeof(jint)) // (this constant folds!)
109 return (address)p + (jint) byte_offset;
110 else
111 return (address)p + byte_offset;
112 }
114 // Externally callable versions:
115 // (Use these in compiler intrinsics which emulate unsafe primitives.)
116 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
117 return field_offset;
118 }
119 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
120 return byte_offset;
121 }
122 jint Unsafe_invocation_key_from_method_slot(jint slot) {
123 return invocation_key_from_method_slot(slot);
124 }
125 jint Unsafe_invocation_key_to_method_slot(jint key) {
126 return invocation_key_to_method_slot(key);
127 }
130 ///// Data in the Java heap.
132 #define GET_FIELD(obj, offset, type_name, v) \
133 oop p = JNIHandles::resolve(obj); \
134 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
136 #define SET_FIELD(obj, offset, type_name, x) \
137 oop p = JNIHandles::resolve(obj); \
138 *(type_name*)index_oop_from_field_offset_long(p, offset) = x
140 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
141 oop p = JNIHandles::resolve(obj); \
142 volatile type_name v = *(volatile type_name*)index_oop_from_field_offset_long(p, offset)
144 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
145 oop p = JNIHandles::resolve(obj); \
146 *(volatile type_name*)index_oop_from_field_offset_long(p, offset) = x; \
147 OrderAccess::fence();
149 // Macros for oops that check UseCompressedOops
151 #define GET_OOP_FIELD(obj, offset, v) \
152 oop p = JNIHandles::resolve(obj); \
153 oop v; \
154 if (UseCompressedOops) { \
155 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
156 v = oopDesc::decode_heap_oop(n); \
157 } else { \
158 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
159 }
161 #define GET_OOP_FIELD_VOLATILE(obj, offset, v) \
162 oop p = JNIHandles::resolve(obj); \
163 volatile oop v; \
164 if (UseCompressedOops) { \
165 volatile narrowOop n = *(volatile narrowOop*)index_oop_from_field_offset_long(p, offset); \
166 v = oopDesc::decode_heap_oop(n); \
167 } else { \
168 v = *(volatile oop*)index_oop_from_field_offset_long(p, offset); \
169 }
172 // Get/SetObject must be special-cased, since it works with handles.
174 // The xxx140 variants for backward compatibility do not allow a full-width offset.
175 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
176 UnsafeWrapper("Unsafe_GetObject");
177 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
178 GET_OOP_FIELD(obj, offset, v)
179 return JNIHandles::make_local(env, v);
180 UNSAFE_END
182 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
183 UnsafeWrapper("Unsafe_SetObject");
184 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
185 oop x = JNIHandles::resolve(x_h);
186 //SET_FIELD(obj, offset, oop, x);
187 oop p = JNIHandles::resolve(obj);
188 if (UseCompressedOops) {
189 if (x != NULL) {
190 // If there is a heap base pointer, we are obliged to emit a store barrier.
191 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
192 } else {
193 narrowOop n = oopDesc::encode_heap_oop_not_null(x);
194 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
195 }
196 } else {
197 if (x != NULL) {
198 // If there is a heap base pointer, we are obliged to emit a store barrier.
199 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
200 } else {
201 *(oop*)index_oop_from_field_offset_long(p, offset) = x;
202 }
203 }
204 UNSAFE_END
206 // The normal variants allow a null base pointer with an arbitrary address.
207 // But if the base pointer is non-null, the offset should make some sense.
208 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
209 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
210 UnsafeWrapper("Unsafe_GetObject");
211 GET_OOP_FIELD(obj, offset, v)
212 return JNIHandles::make_local(env, v);
213 UNSAFE_END
215 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
216 UnsafeWrapper("Unsafe_SetObject");
217 oop x = JNIHandles::resolve(x_h);
218 oop p = JNIHandles::resolve(obj);
219 if (UseCompressedOops) {
220 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
221 } else {
222 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
223 }
224 UNSAFE_END
226 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
227 UnsafeWrapper("Unsafe_GetObjectVolatile");
228 GET_OOP_FIELD_VOLATILE(obj, offset, v)
229 return JNIHandles::make_local(env, v);
230 UNSAFE_END
232 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
233 UnsafeWrapper("Unsafe_SetObjectVolatile");
234 oop x = JNIHandles::resolve(x_h);
235 oop p = JNIHandles::resolve(obj);
236 if (UseCompressedOops) {
237 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
238 } else {
239 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
240 }
241 OrderAccess::fence();
242 UNSAFE_END
244 // Volatile long versions must use locks if !VM_Version::supports_cx8().
245 // support_cx8 is a surrogate for 'supports atomic long memory ops'.
247 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
248 UnsafeWrapper("Unsafe_GetLongVolatile");
249 {
250 if (VM_Version::supports_cx8()) {
251 GET_FIELD_VOLATILE(obj, offset, jlong, v);
252 return v;
253 }
254 else {
255 Handle p (THREAD, JNIHandles::resolve(obj));
256 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
257 ObjectLocker ol(p, THREAD);
258 jlong value = *addr;
259 return value;
260 }
261 }
262 UNSAFE_END
264 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
265 UnsafeWrapper("Unsafe_SetLongVolatile");
266 {
267 if (VM_Version::supports_cx8()) {
268 SET_FIELD_VOLATILE(obj, offset, jlong, x);
269 }
270 else {
271 Handle p (THREAD, JNIHandles::resolve(obj));
272 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
273 ObjectLocker ol(p, THREAD);
274 *addr = x;
275 }
276 }
277 UNSAFE_END
280 #define DEFINE_GETSETOOP(jboolean, Boolean) \
281 \
282 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
283 UnsafeWrapper("Unsafe_Get"#Boolean); \
284 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
285 GET_FIELD(obj, offset, jboolean, v); \
286 return v; \
287 UNSAFE_END \
288 \
289 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
290 UnsafeWrapper("Unsafe_Set"#Boolean); \
291 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
292 SET_FIELD(obj, offset, jboolean, x); \
293 UNSAFE_END \
294 \
295 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
296 UnsafeWrapper("Unsafe_Get"#Boolean); \
297 GET_FIELD(obj, offset, jboolean, v); \
298 return v; \
299 UNSAFE_END \
300 \
301 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
302 UnsafeWrapper("Unsafe_Set"#Boolean); \
303 SET_FIELD(obj, offset, jboolean, x); \
304 UNSAFE_END \
305 \
306 // END DEFINE_GETSETOOP.
309 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
310 \
311 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
312 UnsafeWrapper("Unsafe_Get"#Boolean); \
313 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
314 return v; \
315 UNSAFE_END \
316 \
317 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
318 UnsafeWrapper("Unsafe_Set"#Boolean); \
319 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
320 UNSAFE_END \
321 \
322 // END DEFINE_GETSETOOP_VOLATILE.
324 DEFINE_GETSETOOP(jboolean, Boolean)
325 DEFINE_GETSETOOP(jbyte, Byte)
326 DEFINE_GETSETOOP(jshort, Short);
327 DEFINE_GETSETOOP(jchar, Char);
328 DEFINE_GETSETOOP(jint, Int);
329 DEFINE_GETSETOOP(jlong, Long);
330 DEFINE_GETSETOOP(jfloat, Float);
331 DEFINE_GETSETOOP(jdouble, Double);
333 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
334 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
335 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
336 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
337 DEFINE_GETSETOOP_VOLATILE(jint, Int);
338 // no long -- handled specially
339 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
340 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
342 #undef DEFINE_GETSETOOP
344 // The non-intrinsified versions of setOrdered just use setVolatile
346 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x)) \
347 UnsafeWrapper("Unsafe_SetOrderedInt"); \
348 SET_FIELD_VOLATILE(obj, offset, jint, x); \
349 UNSAFE_END
351 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
352 UnsafeWrapper("Unsafe_SetOrderedObject");
353 oop x = JNIHandles::resolve(x_h);
354 oop p = JNIHandles::resolve(obj);
355 if (UseCompressedOops) {
356 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
357 } else {
358 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
359 }
360 OrderAccess::fence();
361 UNSAFE_END
363 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
364 UnsafeWrapper("Unsafe_SetOrderedLong");
365 {
366 if (VM_Version::supports_cx8()) {
367 SET_FIELD_VOLATILE(obj, offset, jlong, x);
368 }
369 else {
370 Handle p (THREAD, JNIHandles::resolve(obj));
371 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
372 ObjectLocker ol(p, THREAD);
373 *addr = x;
374 }
375 }
376 UNSAFE_END
378 ////// Data in the C heap.
380 // Note: These do not throw NullPointerException for bad pointers.
381 // They just crash. Only a oop base pointer can generate a NullPointerException.
382 //
383 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
384 \
385 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
386 UnsafeWrapper("Unsafe_GetNative"#Type); \
387 void* p = addr_from_java(addr); \
388 JavaThread* t = JavaThread::current(); \
389 t->set_doing_unsafe_access(true); \
390 java_type x = *(volatile native_type*)p; \
391 t->set_doing_unsafe_access(false); \
392 return x; \
393 UNSAFE_END \
394 \
395 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
396 UnsafeWrapper("Unsafe_SetNative"#Type); \
397 JavaThread* t = JavaThread::current(); \
398 t->set_doing_unsafe_access(true); \
399 void* p = addr_from_java(addr); \
400 *(volatile native_type*)p = x; \
401 t->set_doing_unsafe_access(false); \
402 UNSAFE_END \
403 \
404 // END DEFINE_GETSETNATIVE.
406 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
407 DEFINE_GETSETNATIVE(jshort, Short, signed short);
408 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
409 DEFINE_GETSETNATIVE(jint, Int, jint);
410 // no long -- handled specially
411 DEFINE_GETSETNATIVE(jfloat, Float, float);
412 DEFINE_GETSETNATIVE(jdouble, Double, double);
414 #undef DEFINE_GETSETNATIVE
416 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
417 UnsafeWrapper("Unsafe_GetNativeLong");
418 JavaThread* t = JavaThread::current();
419 // We do it this way to avoid problems with access to heap using 64
420 // bit loads, as jlong in heap could be not 64-bit aligned, and on
421 // some CPUs (SPARC) it leads to SIGBUS.
422 t->set_doing_unsafe_access(true);
423 void* p = addr_from_java(addr);
424 jlong x;
425 if (((intptr_t)p & 7) == 0) {
426 // jlong is aligned, do a volatile access
427 x = *(volatile jlong*)p;
428 } else {
429 jlong_accessor acc;
430 acc.words[0] = ((volatile jint*)p)[0];
431 acc.words[1] = ((volatile jint*)p)[1];
432 x = acc.long_value;
433 }
434 t->set_doing_unsafe_access(false);
435 return x;
436 UNSAFE_END
438 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
439 UnsafeWrapper("Unsafe_SetNativeLong");
440 JavaThread* t = JavaThread::current();
441 // see comment for Unsafe_GetNativeLong
442 t->set_doing_unsafe_access(true);
443 void* p = addr_from_java(addr);
444 if (((intptr_t)p & 7) == 0) {
445 // jlong is aligned, do a volatile access
446 *(volatile jlong*)p = x;
447 } else {
448 jlong_accessor acc;
449 acc.long_value = x;
450 ((volatile jint*)p)[0] = acc.words[0];
451 ((volatile jint*)p)[1] = acc.words[1];
452 }
453 t->set_doing_unsafe_access(false);
454 UNSAFE_END
457 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
458 UnsafeWrapper("Unsafe_GetNativeAddress");
459 void* p = addr_from_java(addr);
460 return addr_to_java(*(void**)p);
461 UNSAFE_END
463 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
464 UnsafeWrapper("Unsafe_SetNativeAddress");
465 void* p = addr_from_java(addr);
466 *(void**)p = addr_from_java(x);
467 UNSAFE_END
470 ////// Allocation requests
472 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
473 UnsafeWrapper("Unsafe_AllocateInstance");
474 {
475 ThreadToNativeFromVM ttnfv(thread);
476 return env->AllocObject(cls);
477 }
478 UNSAFE_END
480 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
481 UnsafeWrapper("Unsafe_AllocateMemory");
482 size_t sz = (size_t)size;
483 if (sz != (julong)size || size < 0) {
484 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
485 }
486 if (sz == 0) {
487 return 0;
488 }
489 sz = round_to(sz, HeapWordSize);
490 void* x = os::malloc(sz);
491 if (x == NULL) {
492 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
493 }
494 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
495 return addr_to_java(x);
496 UNSAFE_END
498 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
499 UnsafeWrapper("Unsafe_ReallocateMemory");
500 void* p = addr_from_java(addr);
501 size_t sz = (size_t)size;
502 if (sz != (julong)size || size < 0) {
503 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
504 }
505 if (sz == 0) {
506 os::free(p);
507 return 0;
508 }
509 sz = round_to(sz, HeapWordSize);
510 void* x = (p == NULL) ? os::malloc(sz) : os::realloc(p, sz);
511 if (x == NULL) {
512 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
513 }
514 return addr_to_java(x);
515 UNSAFE_END
517 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
518 UnsafeWrapper("Unsafe_FreeMemory");
519 void* p = addr_from_java(addr);
520 if (p == NULL) {
521 return;
522 }
523 os::free(p);
524 UNSAFE_END
526 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
527 UnsafeWrapper("Unsafe_SetMemory");
528 size_t sz = (size_t)size;
529 if (sz != (julong)size || size < 0) {
530 THROW(vmSymbols::java_lang_IllegalArgumentException());
531 }
532 char* p = (char*) addr_from_java(addr);
533 Copy::fill_to_memory_atomic(p, sz, value);
534 UNSAFE_END
536 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
537 UnsafeWrapper("Unsafe_SetMemory");
538 size_t sz = (size_t)size;
539 if (sz != (julong)size || size < 0) {
540 THROW(vmSymbols::java_lang_IllegalArgumentException());
541 }
542 oop base = JNIHandles::resolve(obj);
543 void* p = index_oop_from_field_offset_long(base, offset);
544 Copy::fill_to_memory_atomic(p, sz, value);
545 UNSAFE_END
547 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
548 UnsafeWrapper("Unsafe_CopyMemory");
549 if (size == 0) {
550 return;
551 }
552 size_t sz = (size_t)size;
553 if (sz != (julong)size || size < 0) {
554 THROW(vmSymbols::java_lang_IllegalArgumentException());
555 }
556 void* src = addr_from_java(srcAddr);
557 void* dst = addr_from_java(dstAddr);
558 Copy::conjoint_memory_atomic(src, dst, sz);
559 UNSAFE_END
561 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
562 UnsafeWrapper("Unsafe_CopyMemory");
563 if (size == 0) {
564 return;
565 }
566 size_t sz = (size_t)size;
567 if (sz != (julong)size || size < 0) {
568 THROW(vmSymbols::java_lang_IllegalArgumentException());
569 }
570 oop srcp = JNIHandles::resolve(srcObj);
571 oop dstp = JNIHandles::resolve(dstObj);
572 if (dstp != NULL && !dstp->is_typeArray()) {
573 // NYI: This works only for non-oop arrays at present.
574 // Generalizing it would be reasonable, but requires card marking.
575 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
576 THROW(vmSymbols::java_lang_IllegalArgumentException());
577 }
578 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
579 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
580 Copy::conjoint_memory_atomic(src, dst, sz);
581 UNSAFE_END
584 ////// Random queries
586 // See comment at file start about UNSAFE_LEAF
587 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
588 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
589 UnsafeWrapper("Unsafe_AddressSize");
590 return sizeof(void*);
591 UNSAFE_END
593 // See comment at file start about UNSAFE_LEAF
594 //UNSAFE_LEAF(jint, Unsafe_PageSize())
595 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
596 UnsafeWrapper("Unsafe_PageSize");
597 return os::vm_page_size();
598 UNSAFE_END
600 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
601 if (field == NULL) {
602 THROW_0(vmSymbols::java_lang_NullPointerException());
603 }
605 oop reflected = JNIHandles::resolve_non_null(field);
606 oop mirror = java_lang_reflect_Field::clazz(reflected);
607 klassOop k = java_lang_Class::as_klassOop(mirror);
608 int slot = java_lang_reflect_Field::slot(reflected);
609 int modifiers = java_lang_reflect_Field::modifiers(reflected);
611 if (must_be_static >= 0) {
612 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
613 if (must_be_static != really_is_static) {
614 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
615 }
616 }
618 int offset = instanceKlass::cast(k)->offset_from_fields(slot);
619 return field_offset_from_byte_offset(offset);
620 }
622 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
623 UnsafeWrapper("Unsafe_ObjectFieldOffset");
624 return find_field_offset(field, 0, THREAD);
625 UNSAFE_END
627 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
628 UnsafeWrapper("Unsafe_StaticFieldOffset");
629 return find_field_offset(field, 1, THREAD);
630 UNSAFE_END
632 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
633 UnsafeWrapper("Unsafe_StaticFieldBase");
634 // Note: In this VM implementation, a field address is always a short
635 // offset from the base of a a klass metaobject. Thus, the full dynamic
636 // range of the return type is never used. However, some implementations
637 // might put the static field inside an array shared by many classes,
638 // or even at a fixed address, in which case the address could be quite
639 // large. In that last case, this function would return NULL, since
640 // the address would operate alone, without any base pointer.
642 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
644 oop reflected = JNIHandles::resolve_non_null(field);
645 oop mirror = java_lang_reflect_Field::clazz(reflected);
646 int modifiers = java_lang_reflect_Field::modifiers(reflected);
648 if ((modifiers & JVM_ACC_STATIC) == 0) {
649 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
650 }
652 return JNIHandles::make_local(env, java_lang_Class::as_klassOop(mirror));
653 UNSAFE_END
655 //@deprecated
656 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
657 UnsafeWrapper("Unsafe_FieldOffset");
658 // tries (but fails) to be polymorphic between static and non-static:
659 jlong offset = find_field_offset(field, -1, THREAD);
660 guarantee(offset == (jint)offset, "offset fits in 32 bits");
661 return (jint)offset;
662 UNSAFE_END
664 //@deprecated
665 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
666 UnsafeWrapper("Unsafe_StaticFieldBase");
667 if (clazz == NULL) {
668 THROW_0(vmSymbols::java_lang_NullPointerException());
669 }
670 return JNIHandles::make_local(env, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
671 UNSAFE_END
673 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz))
674 UnsafeWrapper("Unsafe_EnsureClassInitialized");
675 if (clazz == NULL) {
676 THROW(vmSymbols::java_lang_NullPointerException());
677 }
678 oop mirror = JNIHandles::resolve_non_null(clazz);
679 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(mirror));
680 if (k != NULL) {
681 k->initialize(CHECK);
682 }
683 UNSAFE_END
685 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
686 if (acls == NULL) {
687 THROW(vmSymbols::java_lang_NullPointerException());
688 }
689 oop mirror = JNIHandles::resolve_non_null(acls);
690 klassOop k = java_lang_Class::as_klassOop(mirror);
691 if (k == NULL || !k->klass_part()->oop_is_array()) {
692 THROW(vmSymbols::java_lang_InvalidClassException());
693 } else if (k->klass_part()->oop_is_objArray()) {
694 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
695 scale = heapOopSize;
696 } else if (k->klass_part()->oop_is_typeArray()) {
697 typeArrayKlass* tak = typeArrayKlass::cast(k);
698 base = tak->array_header_in_bytes();
699 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
700 scale = (1 << tak->log2_element_size());
701 } else {
702 ShouldNotReachHere();
703 }
704 }
706 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
707 UnsafeWrapper("Unsafe_ArrayBaseOffset");
708 int base, scale;
709 getBaseAndScale(base, scale, acls, CHECK_0);
710 return field_offset_from_byte_offset(base);
711 UNSAFE_END
714 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
715 UnsafeWrapper("Unsafe_ArrayIndexScale");
716 int base, scale;
717 getBaseAndScale(base, scale, acls, CHECK_0);
718 // This VM packs both fields and array elements down to the byte.
719 // But watch out: If this changes, so that array references for
720 // a given primitive type (say, T_BOOLEAN) use different memory units
721 // than fields, this method MUST return zero for such arrays.
722 // For example, the VM used to store sub-word sized fields in full
723 // words in the object layout, so that accessors like getByte(Object,int)
724 // did not really do what one might expect for arrays. Therefore,
725 // this function used to report a zero scale factor, so that the user
726 // would know not to attempt to access sub-word array elements.
727 // // Code for unpacked fields:
728 // if (scale < wordSize) return 0;
730 // The following allows for a pretty general fieldOffset cookie scheme,
731 // but requires it to be linear in byte offset.
732 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
733 UNSAFE_END
736 static inline void throw_new(JNIEnv *env, const char *ename) {
737 char buf[100];
738 strcpy(buf, "java/lang/");
739 strcat(buf, ename);
740 jclass cls = env->FindClass(buf);
741 char* msg = NULL;
742 env->ThrowNew(cls, msg);
743 }
745 static jclass Unsafe_DefineClass(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
746 {
747 // Code lifted from JDK 1.3 ClassLoader.c
749 jbyte *body;
750 char *utfName;
751 jclass result = 0;
752 char buf[128];
754 if (UsePerfData) {
755 ClassLoader::unsafe_defineClassCallCounter()->inc();
756 }
758 if (data == NULL) {
759 throw_new(env, "NullPointerException");
760 return 0;
761 }
763 /* Work around 4153825. malloc crashes on Solaris when passed a
764 * negative size.
765 */
766 if (length < 0) {
767 throw_new(env, "ArrayIndexOutOfBoundsException");
768 return 0;
769 }
771 body = NEW_C_HEAP_ARRAY(jbyte, length);
773 if (body == 0) {
774 throw_new(env, "OutOfMemoryError");
775 return 0;
776 }
778 env->GetByteArrayRegion(data, offset, length, body);
780 if (env->ExceptionOccurred())
781 goto free_body;
783 if (name != NULL) {
784 uint len = env->GetStringUTFLength(name);
785 int unicode_len = env->GetStringLength(name);
786 if (len >= sizeof(buf)) {
787 utfName = NEW_C_HEAP_ARRAY(char, len + 1);
788 if (utfName == NULL) {
789 throw_new(env, "OutOfMemoryError");
790 goto free_body;
791 }
792 } else {
793 utfName = buf;
794 }
795 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
796 //VerifyFixClassname(utfName);
797 for (uint i = 0; i < len; i++) {
798 if (utfName[i] == '.') utfName[i] = '/';
799 }
800 } else {
801 utfName = NULL;
802 }
804 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
806 if (utfName && utfName != buf)
807 FREE_C_HEAP_ARRAY(char, utfName);
809 free_body:
810 FREE_C_HEAP_ARRAY(jbyte, body);
811 return result;
812 }
813 }
816 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
817 UnsafeWrapper("Unsafe_DefineClass");
818 {
819 ThreadToNativeFromVM ttnfv(thread);
821 int depthFromDefineClass0 = 1;
822 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
823 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
824 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
826 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
827 }
828 UNSAFE_END
831 UNSAFE_ENTRY(jclass, Unsafe_DefineClass1(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
832 UnsafeWrapper("Unsafe_DefineClass");
833 {
834 ThreadToNativeFromVM ttnfv(thread);
836 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
837 }
838 UNSAFE_END
840 #define DAC_Args CLS"[B["OBJ
841 // define a class but do not make it known to the class loader or system dictionary
842 // - host_class: supplies context for linkage, access control, protection domain, and class loader
843 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
844 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
846 // When you load an anonymous class U, it works as if you changed its name just before loading,
847 // to a name that you will never use again. Since the name is lost, no other class can directly
848 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
849 // through java.lang.Class methods like Class.newInstance.
851 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
852 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
853 // An anonymous class also has special privileges to access any member of its host class.
854 // This is the main reason why this loading operation is unsafe. The purpose of this is to
855 // allow language implementations to simulate "open classes"; a host class in effect gets
856 // new code when an anonymous class is loaded alongside it. A less convenient but more
857 // standard way to do this is with reflection, which can also be set to ignore access
858 // restrictions.
860 // Access into an anonymous class is possible only through reflection. Therefore, there
861 // are no special access rules for calling into an anonymous class. The relaxed access
862 // rule for the host class is applied in the opposite direction: A host class reflectively
863 // access one of its anonymous classes.
865 // If you load the same bytecodes twice, you get two different classes. You can reload
866 // the same bytecodes with or without varying CP patches.
868 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
869 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
870 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
872 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
873 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
874 // It is not possible for a named class, or an older anonymous class, to refer by
875 // name (via its CP) to a newer anonymous class.
877 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
878 // or type descriptors used in the loaded anonymous class.
880 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
881 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
882 // be changed to println(greeting), where greeting is an arbitrary object created before
883 // the anonymous class is loaded. This is useful in dynamic languages, in which
884 // various kinds of metaobjects must be introduced as constants into bytecode.
885 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
886 // not just a literal string. For such ldc instructions, the verifier uses the
887 // type Object instead of String, if the loaded constant is not in fact a String.
889 static oop
890 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
891 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
892 HeapWord* *temp_alloc,
893 TRAPS) {
895 if (UsePerfData) {
896 ClassLoader::unsafe_defineClassCallCounter()->inc();
897 }
899 if (data == NULL) {
900 THROW_0(vmSymbols::java_lang_NullPointerException());
901 }
903 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
904 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
905 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length);
906 if (body == NULL) {
907 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
908 }
910 // caller responsible to free it:
911 (*temp_alloc) = body;
913 {
914 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
915 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
916 }
918 u1* class_bytes = (u1*) body;
919 int class_bytes_length = (int) length;
920 if (class_bytes_length < 0) class_bytes_length = 0;
921 if (class_bytes == NULL
922 || host_class == NULL
923 || length != class_bytes_length)
924 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
926 objArrayHandle cp_patches_h;
927 if (cp_patches_jh != NULL) {
928 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
929 if (!p->is_objArray())
930 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
931 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
932 }
934 KlassHandle host_klass(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(host_class)));
935 const char* host_source = host_klass->external_name();
936 Handle host_loader(THREAD, host_klass->class_loader());
937 Handle host_domain(THREAD, host_klass->protection_domain());
939 GrowableArray<Handle>* cp_patches = NULL;
940 if (cp_patches_h.not_null()) {
941 int alen = cp_patches_h->length();
942 for (int i = alen-1; i >= 0; i--) {
943 oop p = cp_patches_h->obj_at(i);
944 if (p != NULL) {
945 Handle patch(THREAD, p);
946 if (cp_patches == NULL)
947 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
948 cp_patches->at_put(i, patch);
949 }
950 }
951 }
953 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
955 instanceKlassHandle anon_klass;
956 {
957 symbolHandle no_class_name;
958 klassOop anonk = SystemDictionary::parse_stream(no_class_name,
959 host_loader, host_domain,
960 &st, host_klass, cp_patches,
961 CHECK_NULL);
962 if (anonk == NULL) return NULL;
963 anon_klass = instanceKlassHandle(THREAD, anonk);
964 }
966 // let caller initialize it as needed...
968 return anon_klass->java_mirror();
969 }
971 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
972 {
973 UnsafeWrapper("Unsafe_DefineAnonymousClass");
974 ResourceMark rm(THREAD);
976 HeapWord* temp_alloc = NULL;
978 jobject res_jh = NULL;
980 { oop res_oop = Unsafe_DefineAnonymousClass_impl(env,
981 host_class, data, cp_patches_jh,
982 &temp_alloc, THREAD);
983 if (res_oop != NULL)
984 res_jh = JNIHandles::make_local(env, res_oop);
985 }
987 // try/finally clause:
988 if (temp_alloc != NULL) {
989 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc);
990 }
992 return (jclass) res_jh;
993 }
994 UNSAFE_END
998 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
999 UnsafeWrapper("Unsafe_MonitorEnter");
1000 {
1001 if (jobj == NULL) {
1002 THROW(vmSymbols::java_lang_NullPointerException());
1003 }
1004 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1005 ObjectSynchronizer::jni_enter(obj, CHECK);
1006 }
1007 UNSAFE_END
1010 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1011 UnsafeWrapper("Unsafe_TryMonitorEnter");
1012 {
1013 if (jobj == NULL) {
1014 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1015 }
1016 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1017 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1018 return (res ? JNI_TRUE : JNI_FALSE);
1019 }
1020 UNSAFE_END
1023 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1024 UnsafeWrapper("Unsafe_MonitorExit");
1025 {
1026 if (jobj == NULL) {
1027 THROW(vmSymbols::java_lang_NullPointerException());
1028 }
1029 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1030 ObjectSynchronizer::jni_exit(obj(), CHECK);
1031 }
1032 UNSAFE_END
1035 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1036 UnsafeWrapper("Unsafe_ThrowException");
1037 {
1038 ThreadToNativeFromVM ttnfv(thread);
1039 env->Throw(thr);
1040 }
1041 UNSAFE_END
1043 // JSR166 ------------------------------------------------------------------
1045 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1046 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1047 oop x = JNIHandles::resolve(x_h);
1048 oop e = JNIHandles::resolve(e_h);
1049 oop p = JNIHandles::resolve(obj);
1050 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1051 update_barrier_set_pre((void*)addr, e);
1052 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e);
1053 jboolean success = (res == e);
1054 if (success)
1055 update_barrier_set((void*)addr, x);
1056 return success;
1057 UNSAFE_END
1059 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1060 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1061 oop p = JNIHandles::resolve(obj);
1062 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1063 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1064 UNSAFE_END
1066 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1067 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1068 Handle p (THREAD, JNIHandles::resolve(obj));
1069 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1070 if (VM_Version::supports_cx8())
1071 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1072 else {
1073 jboolean success = false;
1074 ObjectLocker ol(p, THREAD);
1075 if (*addr == e) { *addr = x; success = true; }
1076 return success;
1077 }
1078 UNSAFE_END
1080 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1081 UnsafeWrapper("Unsafe_Park");
1082 JavaThreadParkedState jtps(thread, time != 0);
1083 thread->parker()->park(isAbsolute != 0, time);
1084 UNSAFE_END
1086 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1087 UnsafeWrapper("Unsafe_Unpark");
1088 Parker* p = NULL;
1089 if (jthread != NULL) {
1090 oop java_thread = JNIHandles::resolve_non_null(jthread);
1091 if (java_thread != NULL) {
1092 jlong lp = java_lang_Thread::park_event(java_thread);
1093 if (lp != 0) {
1094 // This cast is OK even though the jlong might have been read
1095 // non-atomically on 32bit systems, since there, one word will
1096 // always be zero anyway and the value set is always the same
1097 p = (Parker*)addr_from_java(lp);
1098 } else {
1099 // Grab lock if apparently null or using older version of library
1100 MutexLocker mu(Threads_lock);
1101 java_thread = JNIHandles::resolve_non_null(jthread);
1102 if (java_thread != NULL) {
1103 JavaThread* thr = java_lang_Thread::thread(java_thread);
1104 if (thr != NULL) {
1105 p = thr->parker();
1106 if (p != NULL) { // Bind to Java thread for next time.
1107 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1108 }
1109 }
1110 }
1111 }
1112 }
1113 }
1114 if (p != NULL) {
1115 p->unpark();
1116 }
1117 UNSAFE_END
1119 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1120 UnsafeWrapper("Unsafe_Loadavg");
1121 const int max_nelem = 3;
1122 double la[max_nelem];
1123 jint ret;
1125 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1126 assert(a->is_typeArray(), "must be type array");
1128 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1129 ThreadToNativeFromVM ttnfv(thread);
1130 throw_new(env, "ArrayIndexOutOfBoundsException");
1131 return -1;
1132 }
1134 ret = os::loadavg(la, nelem);
1135 if (ret == -1) return -1;
1137 // if successful, ret is the number of samples actually retrieved.
1138 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1139 switch(ret) {
1140 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1141 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1142 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1143 }
1144 return ret;
1145 UNSAFE_END
1147 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1148 UnsafeWrapper("Unsafe_PrefetchRead");
1149 oop p = JNIHandles::resolve(obj);
1150 void* addr = index_oop_from_field_offset_long(p, 0);
1151 Prefetch::read(addr, (intx)offset);
1152 UNSAFE_END
1154 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1155 UnsafeWrapper("Unsafe_PrefetchWrite");
1156 oop p = JNIHandles::resolve(obj);
1157 void* addr = index_oop_from_field_offset_long(p, 0);
1158 Prefetch::write(addr, (intx)offset);
1159 UNSAFE_END
1162 /// JVM_RegisterUnsafeMethods
1164 #define ADR "J"
1166 #define LANG "Ljava/lang/"
1168 #define OBJ LANG"Object;"
1169 #define CLS LANG"Class;"
1170 #define CTR LANG"reflect/Constructor;"
1171 #define FLD LANG"reflect/Field;"
1172 #define MTH LANG"reflect/Method;"
1173 #define THR LANG"Throwable;"
1175 #define DC0_Args LANG"String;[BII"
1176 #define DC1_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1178 #define CC (char*) /*cast a literal from (const char*)*/
1179 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1181 // define deprecated accessors for compabitility with 1.4.0
1182 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1183 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1184 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1186 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1187 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1188 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1189 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1191 // Note: In 1.5.0, there are volatile versions too
1192 #define DECLARE_GETSETOOP(Boolean, Z) \
1193 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1194 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1195 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1196 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1199 #define DECLARE_GETSETNATIVE(Byte, B) \
1200 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1201 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1205 // %%% These are temporarily supported until the SDK sources
1206 // contain the necessarily updated Unsafe.java.
1207 static JNINativeMethod methods_140[] = {
1209 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)},
1210 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)},
1212 DECLARE_GETSETOOP_140(Boolean, Z),
1213 DECLARE_GETSETOOP_140(Byte, B),
1214 DECLARE_GETSETOOP_140(Short, S),
1215 DECLARE_GETSETOOP_140(Char, C),
1216 DECLARE_GETSETOOP_140(Int, I),
1217 DECLARE_GETSETOOP_140(Long, J),
1218 DECLARE_GETSETOOP_140(Float, F),
1219 DECLARE_GETSETOOP_140(Double, D),
1221 DECLARE_GETSETNATIVE(Byte, B),
1222 DECLARE_GETSETNATIVE(Short, S),
1223 DECLARE_GETSETNATIVE(Char, C),
1224 DECLARE_GETSETNATIVE(Int, I),
1225 DECLARE_GETSETNATIVE(Long, J),
1226 DECLARE_GETSETNATIVE(Float, F),
1227 DECLARE_GETSETNATIVE(Double, D),
1229 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1230 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1232 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1233 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1234 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1235 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1236 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1238 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, //deprecated
1239 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, //deprecated
1240 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1241 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1242 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1243 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1244 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1246 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1247 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1248 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1249 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1250 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1251 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1252 };
1254 // These are the old methods prior to the JSR 166 changes in 1.5.0
1255 static JNINativeMethod methods_141[] = {
1257 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1258 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1260 DECLARE_GETSETOOP_141(Boolean, Z),
1261 DECLARE_GETSETOOP_141(Byte, B),
1262 DECLARE_GETSETOOP_141(Short, S),
1263 DECLARE_GETSETOOP_141(Char, C),
1264 DECLARE_GETSETOOP_141(Int, I),
1265 DECLARE_GETSETOOP_141(Long, J),
1266 DECLARE_GETSETOOP_141(Float, F),
1267 DECLARE_GETSETOOP_141(Double, D),
1269 DECLARE_GETSETNATIVE(Byte, B),
1270 DECLARE_GETSETNATIVE(Short, S),
1271 DECLARE_GETSETNATIVE(Char, C),
1272 DECLARE_GETSETNATIVE(Int, I),
1273 DECLARE_GETSETNATIVE(Long, J),
1274 DECLARE_GETSETNATIVE(Float, F),
1275 DECLARE_GETSETNATIVE(Double, D),
1277 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1278 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1280 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1281 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1282 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1283 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1284 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1286 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1287 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1288 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1289 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1290 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1291 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1292 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1293 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1295 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1296 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1297 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1298 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1299 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1300 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1302 };
1304 // These are the old methods prior to the JSR 166 changes in 1.6.0
1305 static JNINativeMethod methods_15[] = {
1307 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1308 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1309 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1310 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1313 DECLARE_GETSETOOP(Boolean, Z),
1314 DECLARE_GETSETOOP(Byte, B),
1315 DECLARE_GETSETOOP(Short, S),
1316 DECLARE_GETSETOOP(Char, C),
1317 DECLARE_GETSETOOP(Int, I),
1318 DECLARE_GETSETOOP(Long, J),
1319 DECLARE_GETSETOOP(Float, F),
1320 DECLARE_GETSETOOP(Double, D),
1322 DECLARE_GETSETNATIVE(Byte, B),
1323 DECLARE_GETSETNATIVE(Short, S),
1324 DECLARE_GETSETNATIVE(Char, C),
1325 DECLARE_GETSETNATIVE(Int, I),
1326 DECLARE_GETSETNATIVE(Long, J),
1327 DECLARE_GETSETNATIVE(Float, F),
1328 DECLARE_GETSETNATIVE(Double, D),
1330 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1331 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1333 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1334 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1335 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1336 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1337 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1339 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1340 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1341 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1342 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1343 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1344 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1345 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1346 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1348 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1349 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1350 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1351 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1352 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1353 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1354 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1355 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1356 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1357 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1358 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1360 };
1362 // These are the correct methods, moving forward:
1363 static JNINativeMethod methods[] = {
1365 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1366 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1367 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1368 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1371 DECLARE_GETSETOOP(Boolean, Z),
1372 DECLARE_GETSETOOP(Byte, B),
1373 DECLARE_GETSETOOP(Short, S),
1374 DECLARE_GETSETOOP(Char, C),
1375 DECLARE_GETSETOOP(Int, I),
1376 DECLARE_GETSETOOP(Long, J),
1377 DECLARE_GETSETOOP(Float, F),
1378 DECLARE_GETSETOOP(Double, D),
1380 DECLARE_GETSETNATIVE(Byte, B),
1381 DECLARE_GETSETNATIVE(Short, S),
1382 DECLARE_GETSETNATIVE(Char, C),
1383 DECLARE_GETSETNATIVE(Int, I),
1384 DECLARE_GETSETNATIVE(Long, J),
1385 DECLARE_GETSETNATIVE(Float, F),
1386 DECLARE_GETSETNATIVE(Double, D),
1388 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1389 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1391 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1392 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1393 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1394 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1395 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1397 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1398 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1399 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1400 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1401 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1402 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1403 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1404 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1406 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1407 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1408 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1409 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1410 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1411 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1412 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1413 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1414 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1415 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1416 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1417 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1418 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1419 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1420 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1422 // {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)},
1424 // {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1425 // {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1426 // {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1427 // {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1429 };
1431 JNINativeMethod loadavg_method[] = {
1432 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1433 };
1435 JNINativeMethod prefetch_methods[] = {
1436 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1437 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1438 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1439 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1440 };
1442 JNINativeMethod memcopy_methods[] = {
1443 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1444 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1445 };
1447 JNINativeMethod memcopy_methods_15[] = {
1448 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1449 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1450 };
1452 JNINativeMethod anonk_methods[] = {
1453 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1454 };
1456 #undef CC
1457 #undef FN_PTR
1459 #undef ADR
1460 #undef LANG
1461 #undef OBJ
1462 #undef CLS
1463 #undef CTR
1464 #undef FLD
1465 #undef MTH
1466 #undef THR
1467 #undef DC0_Args
1468 #undef DC1_Args
1470 #undef DECLARE_GETSETOOP
1471 #undef DECLARE_GETSETNATIVE
1474 // This one function is exported, used by NativeLookup.
1475 // The Unsafe_xxx functions above are called only from the interpreter.
1476 // The optimizer looks at names and signatures to recognize
1477 // individual functions.
1479 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1480 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1481 {
1482 ThreadToNativeFromVM ttnfv(thread);
1483 {
1484 env->RegisterNatives(unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1485 if (env->ExceptionOccurred()) {
1486 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1487 tty->print_cr("Warning: SDK 1.6 Unsafe.loadavg not found.");
1488 }
1489 env->ExceptionClear();
1490 }
1491 }
1492 {
1493 env->RegisterNatives(unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1494 if (env->ExceptionOccurred()) {
1495 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1496 tty->print_cr("Warning: SDK 1.6 Unsafe.prefetchRead/Write not found.");
1497 }
1498 env->ExceptionClear();
1499 }
1500 }
1501 {
1502 env->RegisterNatives(unsafecls, memcopy_methods, sizeof(memcopy_methods)/sizeof(JNINativeMethod));
1503 if (env->ExceptionOccurred()) {
1504 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1505 tty->print_cr("Warning: SDK 1.7 Unsafe.copyMemory not found.");
1506 }
1507 env->ExceptionClear();
1508 env->RegisterNatives(unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1509 if (env->ExceptionOccurred()) {
1510 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1511 tty->print_cr("Warning: SDK 1.5 Unsafe.copyMemory not found.");
1512 }
1513 env->ExceptionClear();
1514 }
1515 }
1516 }
1517 if (AnonymousClasses) {
1518 env->RegisterNatives(unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1519 if (env->ExceptionOccurred()) {
1520 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1521 tty->print_cr("Warning: SDK 1.7 Unsafe.defineClass (anonymous version) not found.");
1522 }
1523 env->ExceptionClear();
1524 }
1525 }
1526 int status = env->RegisterNatives(unsafecls, methods, sizeof(methods)/sizeof(JNINativeMethod));
1527 if (env->ExceptionOccurred()) {
1528 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1529 tty->print_cr("Warning: SDK 1.6 version of Unsafe not found.");
1530 }
1531 env->ExceptionClear();
1532 // %%% For now, be backward compatible with an older class:
1533 status = env->RegisterNatives(unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1534 }
1535 if (env->ExceptionOccurred()) {
1536 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1537 tty->print_cr("Warning: SDK 1.5 version of Unsafe not found.");
1538 }
1539 env->ExceptionClear();
1540 // %%% For now, be backward compatible with an older class:
1541 status = env->RegisterNatives(unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1542 }
1543 if (env->ExceptionOccurred()) {
1544 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1545 tty->print_cr("Warning: SDK 1.4.1 version of Unsafe not found.");
1546 }
1547 env->ExceptionClear();
1548 // %%% For now, be backward compatible with an older class:
1549 status = env->RegisterNatives(unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1550 }
1551 guarantee(status == 0, "register unsafe natives");
1552 }
1553 JVM_END
