Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/prims/unsafe.cpp@ddd894528dbc
src/share/vm/prims/unsafe.cpp
Thu, 23 Jun 2011 17:14:06 -0700
- author
- jrose
- date
- Thu, 23 Jun 2011 17:14:06 -0700
- changeset 2982
- ddd894528dbc
- parent 2784
- 92add02409c9
- child 3095
- 19241ae0d839
- permissions
- -rw-r--r--
7056328: JSR 292 invocation sometimes fails in adapters for types not on boot class path
Reviewed-by: never
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 #ifndef SERIALGC
28 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
29 #endif // SERIALGC
30 #include "memory/allocation.inline.hpp"
31 #include "prims/jni.h"
32 #include "prims/jvm.h"
33 #include "runtime/globals.hpp"
34 #include "runtime/interfaceSupport.hpp"
35 #include "runtime/reflection.hpp"
36 #include "runtime/reflectionCompat.hpp"
37 #include "runtime/synchronizer.hpp"
38 #include "services/threadService.hpp"
39 #include "utilities/copy.hpp"
40 #include "utilities/dtrace.hpp"
42 /*
43 * Implementation of class sun.misc.Unsafe
44 */
46 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long);
47 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t);
48 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t);
50 #define MAX_OBJECT_SIZE \
51 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
52 + ((julong)max_jint * sizeof(double)) )
55 #define UNSAFE_ENTRY(result_type, header) \
56 JVM_ENTRY(result_type, header)
58 // Can't use UNSAFE_LEAF because it has the signature of a straight
59 // call into the runtime (just like JVM_LEAF, funny that) but it's
60 // called like a Java Native and thus the wrapper built for it passes
61 // arguments like a JNI call. It expects those arguments to be popped
62 // from the stack on Intel like all good JNI args are, and adjusts the
63 // stack according. Since the JVM_LEAF call expects no extra
64 // arguments the stack isn't popped in the C code, is pushed by the
65 // wrapper and we get sick.
66 //#define UNSAFE_LEAF(result_type, header) \
67 // JVM_LEAF(result_type, header)
69 #define UNSAFE_END JVM_END
71 #define UnsafeWrapper(arg) /*nothing, for the present*/
74 inline void* addr_from_java(jlong addr) {
75 // This assert fails in a variety of ways on 32-bit systems.
76 // It is impossible to predict whether native code that converts
77 // pointers to longs will sign-extend or zero-extend the addresses.
78 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
79 return (void*)(uintptr_t)addr;
80 }
82 inline jlong addr_to_java(void* p) {
83 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
84 return (uintptr_t)p;
85 }
88 // Note: The VM's obj_field and related accessors use byte-scaled
89 // ("unscaled") offsets, just as the unsafe methods do.
91 // However, the method Unsafe.fieldOffset explicitly declines to
92 // guarantee this. The field offset values manipulated by the Java user
93 // through the Unsafe API are opaque cookies that just happen to be byte
94 // offsets. We represent this state of affairs by passing the cookies
95 // through conversion functions when going between the VM and the Unsafe API.
96 // The conversion functions just happen to be no-ops at present.
98 inline jlong field_offset_to_byte_offset(jlong field_offset) {
99 return field_offset;
100 }
102 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
103 return byte_offset;
104 }
106 inline jint invocation_key_from_method_slot(jint slot) {
107 return slot;
108 }
110 inline jint invocation_key_to_method_slot(jint key) {
111 return key;
112 }
114 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
115 jlong byte_offset = field_offset_to_byte_offset(field_offset);
116 // Don't allow unsafe to be used to read or write the header word of oops
117 assert(p == NULL || field_offset >= oopDesc::header_size(), "offset must be outside of header");
118 #ifdef ASSERT
119 if (p != NULL) {
120 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
121 if (byte_offset == (jint)byte_offset) {
122 void* ptr_plus_disp = (address)p + byte_offset;
123 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
124 "raw [ptr+disp] must be consistent with oop::field_base");
125 }
126 }
127 #endif
128 if (sizeof(char*) == sizeof(jint)) // (this constant folds!)
129 return (address)p + (jint) byte_offset;
130 else
131 return (address)p + byte_offset;
132 }
134 // Externally callable versions:
135 // (Use these in compiler intrinsics which emulate unsafe primitives.)
136 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
137 return field_offset;
138 }
139 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
140 return byte_offset;
141 }
142 jint Unsafe_invocation_key_from_method_slot(jint slot) {
143 return invocation_key_from_method_slot(slot);
144 }
145 jint Unsafe_invocation_key_to_method_slot(jint key) {
146 return invocation_key_to_method_slot(key);
147 }
150 ///// Data in the Java heap.
152 #define GET_FIELD(obj, offset, type_name, v) \
153 oop p = JNIHandles::resolve(obj); \
154 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
156 #define SET_FIELD(obj, offset, type_name, x) \
157 oop p = JNIHandles::resolve(obj); \
158 *(type_name*)index_oop_from_field_offset_long(p, offset) = x
160 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
161 oop p = JNIHandles::resolve(obj); \
162 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
164 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
165 oop p = JNIHandles::resolve(obj); \
166 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x);
168 // Macros for oops that check UseCompressedOops
170 #define GET_OOP_FIELD(obj, offset, v) \
171 oop p = JNIHandles::resolve(obj); \
172 oop v; \
173 if (UseCompressedOops) { \
174 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
175 v = oopDesc::decode_heap_oop(n); \
176 } else { \
177 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
178 }
180 #define GET_OOP_FIELD_VOLATILE(obj, offset, v) \
181 oop p = JNIHandles::resolve(obj); \
182 volatile oop v; \
183 if (UseCompressedOops) { \
184 volatile narrowOop n = *(volatile narrowOop*)index_oop_from_field_offset_long(p, offset); \
185 v = oopDesc::decode_heap_oop(n); \
186 } else { \
187 v = *(volatile oop*)index_oop_from_field_offset_long(p, offset); \
188 } \
189 OrderAccess::acquire();
192 // Get/SetObject must be special-cased, since it works with handles.
194 // The xxx140 variants for backward compatibility do not allow a full-width offset.
195 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
196 UnsafeWrapper("Unsafe_GetObject");
197 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
198 GET_OOP_FIELD(obj, offset, v)
199 jobject ret = JNIHandles::make_local(env, v);
200 #ifndef SERIALGC
201 // We could be accessing the referent field in a reference
202 // object. If G1 is enabled then we need to register a non-null
203 // referent with the SATB barrier.
204 if (UseG1GC) {
205 bool needs_barrier = false;
207 if (ret != NULL) {
208 if (offset == java_lang_ref_Reference::referent_offset) {
209 oop o = JNIHandles::resolve_non_null(obj);
210 klassOop k = o->klass();
211 if (instanceKlass::cast(k)->reference_type() != REF_NONE) {
212 assert(instanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
213 needs_barrier = true;
214 }
215 }
216 }
218 if (needs_barrier) {
219 oop referent = JNIHandles::resolve(ret);
220 G1SATBCardTableModRefBS::enqueue(referent);
221 }
222 }
223 #endif // SERIALGC
224 return ret;
225 UNSAFE_END
227 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
228 UnsafeWrapper("Unsafe_SetObject");
229 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
230 oop x = JNIHandles::resolve(x_h);
231 //SET_FIELD(obj, offset, oop, x);
232 oop p = JNIHandles::resolve(obj);
233 if (UseCompressedOops) {
234 if (x != NULL) {
235 // If there is a heap base pointer, we are obliged to emit a store barrier.
236 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
237 } else {
238 narrowOop n = oopDesc::encode_heap_oop_not_null(x);
239 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
240 }
241 } else {
242 if (x != NULL) {
243 // If there is a heap base pointer, we are obliged to emit a store barrier.
244 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
245 } else {
246 *(oop*)index_oop_from_field_offset_long(p, offset) = x;
247 }
248 }
249 UNSAFE_END
251 // The normal variants allow a null base pointer with an arbitrary address.
252 // But if the base pointer is non-null, the offset should make some sense.
253 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
254 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
255 UnsafeWrapper("Unsafe_GetObject");
256 GET_OOP_FIELD(obj, offset, v)
257 jobject ret = JNIHandles::make_local(env, v);
258 #ifndef SERIALGC
259 // We could be accessing the referent field in a reference
260 // object. If G1 is enabled then we need to register non-null
261 // referent with the SATB barrier.
262 if (UseG1GC) {
263 bool needs_barrier = false;
265 if (ret != NULL) {
266 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) {
267 oop o = JNIHandles::resolve(obj);
268 klassOop k = o->klass();
269 if (instanceKlass::cast(k)->reference_type() != REF_NONE) {
270 assert(instanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
271 needs_barrier = true;
272 }
273 }
274 }
276 if (needs_barrier) {
277 oop referent = JNIHandles::resolve(ret);
278 G1SATBCardTableModRefBS::enqueue(referent);
279 }
280 }
281 #endif // SERIALGC
282 return ret;
283 UNSAFE_END
285 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
286 UnsafeWrapper("Unsafe_SetObject");
287 oop x = JNIHandles::resolve(x_h);
288 oop p = JNIHandles::resolve(obj);
289 if (UseCompressedOops) {
290 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
291 } else {
292 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
293 }
294 UNSAFE_END
296 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
297 UnsafeWrapper("Unsafe_GetObjectVolatile");
298 GET_OOP_FIELD_VOLATILE(obj, offset, v)
299 return JNIHandles::make_local(env, v);
300 UNSAFE_END
302 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
303 UnsafeWrapper("Unsafe_SetObjectVolatile");
304 oop x = JNIHandles::resolve(x_h);
305 oop p = JNIHandles::resolve(obj);
306 void* addr = index_oop_from_field_offset_long(p, offset);
307 OrderAccess::release();
308 if (UseCompressedOops) {
309 oop_store((narrowOop*)addr, x);
310 } else {
311 oop_store((oop*)addr, x);
312 }
313 OrderAccess::fence();
314 UNSAFE_END
316 #if defined(SPARC) || defined(X86)
317 // Sparc and X86 have atomic jlong (8 bytes) instructions
319 #else
320 // Keep old code for platforms which may not have atomic jlong (8 bytes) instructions
322 // Volatile long versions must use locks if !VM_Version::supports_cx8().
323 // support_cx8 is a surrogate for 'supports atomic long memory ops'.
325 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
326 UnsafeWrapper("Unsafe_GetLongVolatile");
327 {
328 if (VM_Version::supports_cx8()) {
329 GET_FIELD_VOLATILE(obj, offset, jlong, v);
330 return v;
331 }
332 else {
333 Handle p (THREAD, JNIHandles::resolve(obj));
334 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
335 ObjectLocker ol(p, THREAD);
336 jlong value = *addr;
337 return value;
338 }
339 }
340 UNSAFE_END
342 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
343 UnsafeWrapper("Unsafe_SetLongVolatile");
344 {
345 if (VM_Version::supports_cx8()) {
346 SET_FIELD_VOLATILE(obj, offset, jlong, x);
347 }
348 else {
349 Handle p (THREAD, JNIHandles::resolve(obj));
350 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
351 ObjectLocker ol(p, THREAD);
352 *addr = x;
353 }
354 }
355 UNSAFE_END
357 #endif // not SPARC and not X86
359 #define DEFINE_GETSETOOP(jboolean, Boolean) \
360 \
361 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
362 UnsafeWrapper("Unsafe_Get"#Boolean); \
363 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
364 GET_FIELD(obj, offset, jboolean, v); \
365 return v; \
366 UNSAFE_END \
367 \
368 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
369 UnsafeWrapper("Unsafe_Set"#Boolean); \
370 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
371 SET_FIELD(obj, offset, jboolean, x); \
372 UNSAFE_END \
373 \
374 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
375 UnsafeWrapper("Unsafe_Get"#Boolean); \
376 GET_FIELD(obj, offset, jboolean, v); \
377 return v; \
378 UNSAFE_END \
379 \
380 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
381 UnsafeWrapper("Unsafe_Set"#Boolean); \
382 SET_FIELD(obj, offset, jboolean, x); \
383 UNSAFE_END \
384 \
385 // END DEFINE_GETSETOOP.
387 DEFINE_GETSETOOP(jboolean, Boolean)
388 DEFINE_GETSETOOP(jbyte, Byte)
389 DEFINE_GETSETOOP(jshort, Short);
390 DEFINE_GETSETOOP(jchar, Char);
391 DEFINE_GETSETOOP(jint, Int);
392 DEFINE_GETSETOOP(jlong, Long);
393 DEFINE_GETSETOOP(jfloat, Float);
394 DEFINE_GETSETOOP(jdouble, Double);
396 #undef DEFINE_GETSETOOP
398 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
399 \
400 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
401 UnsafeWrapper("Unsafe_Get"#Boolean); \
402 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
403 return v; \
404 UNSAFE_END \
405 \
406 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
407 UnsafeWrapper("Unsafe_Set"#Boolean); \
408 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
409 UNSAFE_END \
410 \
411 // END DEFINE_GETSETOOP_VOLATILE.
413 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
414 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
415 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
416 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
417 DEFINE_GETSETOOP_VOLATILE(jint, Int);
418 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
419 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
421 #if defined(SPARC) || defined(X86)
422 // Sparc and X86 have atomic jlong (8 bytes) instructions
423 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
424 #endif
426 #undef DEFINE_GETSETOOP_VOLATILE
428 // The non-intrinsified versions of setOrdered just use setVolatile
430 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
431 UnsafeWrapper("Unsafe_SetOrderedInt");
432 SET_FIELD_VOLATILE(obj, offset, jint, x);
433 UNSAFE_END
435 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
436 UnsafeWrapper("Unsafe_SetOrderedObject");
437 oop x = JNIHandles::resolve(x_h);
438 oop p = JNIHandles::resolve(obj);
439 void* addr = index_oop_from_field_offset_long(p, offset);
440 OrderAccess::release();
441 if (UseCompressedOops) {
442 oop_store((narrowOop*)addr, x);
443 } else {
444 oop_store((oop*)addr, x);
445 }
446 OrderAccess::fence();
447 UNSAFE_END
449 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
450 UnsafeWrapper("Unsafe_SetOrderedLong");
451 #if defined(SPARC) || defined(X86)
452 // Sparc and X86 have atomic jlong (8 bytes) instructions
453 SET_FIELD_VOLATILE(obj, offset, jlong, x);
454 #else
455 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
456 {
457 if (VM_Version::supports_cx8()) {
458 SET_FIELD_VOLATILE(obj, offset, jlong, x);
459 }
460 else {
461 Handle p (THREAD, JNIHandles::resolve(obj));
462 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
463 ObjectLocker ol(p, THREAD);
464 *addr = x;
465 }
466 }
467 #endif
468 UNSAFE_END
470 ////// Data in the C heap.
472 // Note: These do not throw NullPointerException for bad pointers.
473 // They just crash. Only a oop base pointer can generate a NullPointerException.
474 //
475 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
476 \
477 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
478 UnsafeWrapper("Unsafe_GetNative"#Type); \
479 void* p = addr_from_java(addr); \
480 JavaThread* t = JavaThread::current(); \
481 t->set_doing_unsafe_access(true); \
482 java_type x = *(volatile native_type*)p; \
483 t->set_doing_unsafe_access(false); \
484 return x; \
485 UNSAFE_END \
486 \
487 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
488 UnsafeWrapper("Unsafe_SetNative"#Type); \
489 JavaThread* t = JavaThread::current(); \
490 t->set_doing_unsafe_access(true); \
491 void* p = addr_from_java(addr); \
492 *(volatile native_type*)p = x; \
493 t->set_doing_unsafe_access(false); \
494 UNSAFE_END \
495 \
496 // END DEFINE_GETSETNATIVE.
498 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
499 DEFINE_GETSETNATIVE(jshort, Short, signed short);
500 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
501 DEFINE_GETSETNATIVE(jint, Int, jint);
502 // no long -- handled specially
503 DEFINE_GETSETNATIVE(jfloat, Float, float);
504 DEFINE_GETSETNATIVE(jdouble, Double, double);
506 #undef DEFINE_GETSETNATIVE
508 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
509 UnsafeWrapper("Unsafe_GetNativeLong");
510 JavaThread* t = JavaThread::current();
511 // We do it this way to avoid problems with access to heap using 64
512 // bit loads, as jlong in heap could be not 64-bit aligned, and on
513 // some CPUs (SPARC) it leads to SIGBUS.
514 t->set_doing_unsafe_access(true);
515 void* p = addr_from_java(addr);
516 jlong x;
517 if (((intptr_t)p & 7) == 0) {
518 // jlong is aligned, do a volatile access
519 x = *(volatile jlong*)p;
520 } else {
521 jlong_accessor acc;
522 acc.words[0] = ((volatile jint*)p)[0];
523 acc.words[1] = ((volatile jint*)p)[1];
524 x = acc.long_value;
525 }
526 t->set_doing_unsafe_access(false);
527 return x;
528 UNSAFE_END
530 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
531 UnsafeWrapper("Unsafe_SetNativeLong");
532 JavaThread* t = JavaThread::current();
533 // see comment for Unsafe_GetNativeLong
534 t->set_doing_unsafe_access(true);
535 void* p = addr_from_java(addr);
536 if (((intptr_t)p & 7) == 0) {
537 // jlong is aligned, do a volatile access
538 *(volatile jlong*)p = x;
539 } else {
540 jlong_accessor acc;
541 acc.long_value = x;
542 ((volatile jint*)p)[0] = acc.words[0];
543 ((volatile jint*)p)[1] = acc.words[1];
544 }
545 t->set_doing_unsafe_access(false);
546 UNSAFE_END
549 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
550 UnsafeWrapper("Unsafe_GetNativeAddress");
551 void* p = addr_from_java(addr);
552 return addr_to_java(*(void**)p);
553 UNSAFE_END
555 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
556 UnsafeWrapper("Unsafe_SetNativeAddress");
557 void* p = addr_from_java(addr);
558 *(void**)p = addr_from_java(x);
559 UNSAFE_END
562 ////// Allocation requests
564 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
565 UnsafeWrapper("Unsafe_AllocateInstance");
566 {
567 ThreadToNativeFromVM ttnfv(thread);
568 return env->AllocObject(cls);
569 }
570 UNSAFE_END
572 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
573 UnsafeWrapper("Unsafe_AllocateMemory");
574 size_t sz = (size_t)size;
575 if (sz != (julong)size || size < 0) {
576 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
577 }
578 if (sz == 0) {
579 return 0;
580 }
581 sz = round_to(sz, HeapWordSize);
582 void* x = os::malloc(sz);
583 if (x == NULL) {
584 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
585 }
586 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
587 return addr_to_java(x);
588 UNSAFE_END
590 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
591 UnsafeWrapper("Unsafe_ReallocateMemory");
592 void* p = addr_from_java(addr);
593 size_t sz = (size_t)size;
594 if (sz != (julong)size || size < 0) {
595 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
596 }
597 if (sz == 0) {
598 os::free(p);
599 return 0;
600 }
601 sz = round_to(sz, HeapWordSize);
602 void* x = (p == NULL) ? os::malloc(sz) : os::realloc(p, sz);
603 if (x == NULL) {
604 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
605 }
606 return addr_to_java(x);
607 UNSAFE_END
609 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
610 UnsafeWrapper("Unsafe_FreeMemory");
611 void* p = addr_from_java(addr);
612 if (p == NULL) {
613 return;
614 }
615 os::free(p);
616 UNSAFE_END
618 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
619 UnsafeWrapper("Unsafe_SetMemory");
620 size_t sz = (size_t)size;
621 if (sz != (julong)size || size < 0) {
622 THROW(vmSymbols::java_lang_IllegalArgumentException());
623 }
624 char* p = (char*) addr_from_java(addr);
625 Copy::fill_to_memory_atomic(p, sz, value);
626 UNSAFE_END
628 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
629 UnsafeWrapper("Unsafe_SetMemory");
630 size_t sz = (size_t)size;
631 if (sz != (julong)size || size < 0) {
632 THROW(vmSymbols::java_lang_IllegalArgumentException());
633 }
634 oop base = JNIHandles::resolve(obj);
635 void* p = index_oop_from_field_offset_long(base, offset);
636 Copy::fill_to_memory_atomic(p, sz, value);
637 UNSAFE_END
639 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
640 UnsafeWrapper("Unsafe_CopyMemory");
641 if (size == 0) {
642 return;
643 }
644 size_t sz = (size_t)size;
645 if (sz != (julong)size || size < 0) {
646 THROW(vmSymbols::java_lang_IllegalArgumentException());
647 }
648 void* src = addr_from_java(srcAddr);
649 void* dst = addr_from_java(dstAddr);
650 Copy::conjoint_memory_atomic(src, dst, sz);
651 UNSAFE_END
653 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
654 UnsafeWrapper("Unsafe_CopyMemory");
655 if (size == 0) {
656 return;
657 }
658 size_t sz = (size_t)size;
659 if (sz != (julong)size || size < 0) {
660 THROW(vmSymbols::java_lang_IllegalArgumentException());
661 }
662 oop srcp = JNIHandles::resolve(srcObj);
663 oop dstp = JNIHandles::resolve(dstObj);
664 if (dstp != NULL && !dstp->is_typeArray()) {
665 // NYI: This works only for non-oop arrays at present.
666 // Generalizing it would be reasonable, but requires card marking.
667 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
668 THROW(vmSymbols::java_lang_IllegalArgumentException());
669 }
670 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
671 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
672 Copy::conjoint_memory_atomic(src, dst, sz);
673 UNSAFE_END
676 ////// Random queries
678 // See comment at file start about UNSAFE_LEAF
679 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
680 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
681 UnsafeWrapper("Unsafe_AddressSize");
682 return sizeof(void*);
683 UNSAFE_END
685 // See comment at file start about UNSAFE_LEAF
686 //UNSAFE_LEAF(jint, Unsafe_PageSize())
687 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
688 UnsafeWrapper("Unsafe_PageSize");
689 return os::vm_page_size();
690 UNSAFE_END
692 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
693 if (field == NULL) {
694 THROW_0(vmSymbols::java_lang_NullPointerException());
695 }
697 oop reflected = JNIHandles::resolve_non_null(field);
698 oop mirror = java_lang_reflect_Field::clazz(reflected);
699 klassOop k = java_lang_Class::as_klassOop(mirror);
700 int slot = java_lang_reflect_Field::slot(reflected);
701 int modifiers = java_lang_reflect_Field::modifiers(reflected);
703 if (must_be_static >= 0) {
704 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
705 if (must_be_static != really_is_static) {
706 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
707 }
708 }
710 int offset = instanceKlass::cast(k)->offset_from_fields(slot);
711 return field_offset_from_byte_offset(offset);
712 }
714 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
715 UnsafeWrapper("Unsafe_ObjectFieldOffset");
716 return find_field_offset(field, 0, THREAD);
717 UNSAFE_END
719 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
720 UnsafeWrapper("Unsafe_StaticFieldOffset");
721 return find_field_offset(field, 1, THREAD);
722 UNSAFE_END
724 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
725 UnsafeWrapper("Unsafe_StaticFieldBase");
726 // Note: In this VM implementation, a field address is always a short
727 // offset from the base of a a klass metaobject. Thus, the full dynamic
728 // range of the return type is never used. However, some implementations
729 // might put the static field inside an array shared by many classes,
730 // or even at a fixed address, in which case the address could be quite
731 // large. In that last case, this function would return NULL, since
732 // the address would operate alone, without any base pointer.
734 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
736 oop reflected = JNIHandles::resolve_non_null(field);
737 oop mirror = java_lang_reflect_Field::clazz(reflected);
738 int modifiers = java_lang_reflect_Field::modifiers(reflected);
740 if ((modifiers & JVM_ACC_STATIC) == 0) {
741 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
742 }
744 return JNIHandles::make_local(env, mirror);
745 UNSAFE_END
747 //@deprecated
748 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
749 UnsafeWrapper("Unsafe_FieldOffset");
750 // tries (but fails) to be polymorphic between static and non-static:
751 jlong offset = find_field_offset(field, -1, THREAD);
752 guarantee(offset == (jint)offset, "offset fits in 32 bits");
753 return (jint)offset;
754 UNSAFE_END
756 //@deprecated
757 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
758 UnsafeWrapper("Unsafe_StaticFieldBase");
759 if (clazz == NULL) {
760 THROW_0(vmSymbols::java_lang_NullPointerException());
761 }
762 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
763 UNSAFE_END
765 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz))
766 UnsafeWrapper("Unsafe_EnsureClassInitialized");
767 if (clazz == NULL) {
768 THROW(vmSymbols::java_lang_NullPointerException());
769 }
770 oop mirror = JNIHandles::resolve_non_null(clazz);
771 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(mirror));
772 if (k != NULL) {
773 k->initialize(CHECK);
774 }
775 UNSAFE_END
777 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
778 if (acls == NULL) {
779 THROW(vmSymbols::java_lang_NullPointerException());
780 }
781 oop mirror = JNIHandles::resolve_non_null(acls);
782 klassOop k = java_lang_Class::as_klassOop(mirror);
783 if (k == NULL || !k->klass_part()->oop_is_array()) {
784 THROW(vmSymbols::java_lang_InvalidClassException());
785 } else if (k->klass_part()->oop_is_objArray()) {
786 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
787 scale = heapOopSize;
788 } else if (k->klass_part()->oop_is_typeArray()) {
789 typeArrayKlass* tak = typeArrayKlass::cast(k);
790 base = tak->array_header_in_bytes();
791 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
792 scale = (1 << tak->log2_element_size());
793 } else {
794 ShouldNotReachHere();
795 }
796 }
798 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
799 UnsafeWrapper("Unsafe_ArrayBaseOffset");
800 int base, scale;
801 getBaseAndScale(base, scale, acls, CHECK_0);
802 return field_offset_from_byte_offset(base);
803 UNSAFE_END
806 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
807 UnsafeWrapper("Unsafe_ArrayIndexScale");
808 int base, scale;
809 getBaseAndScale(base, scale, acls, CHECK_0);
810 // This VM packs both fields and array elements down to the byte.
811 // But watch out: If this changes, so that array references for
812 // a given primitive type (say, T_BOOLEAN) use different memory units
813 // than fields, this method MUST return zero for such arrays.
814 // For example, the VM used to store sub-word sized fields in full
815 // words in the object layout, so that accessors like getByte(Object,int)
816 // did not really do what one might expect for arrays. Therefore,
817 // this function used to report a zero scale factor, so that the user
818 // would know not to attempt to access sub-word array elements.
819 // // Code for unpacked fields:
820 // if (scale < wordSize) return 0;
822 // The following allows for a pretty general fieldOffset cookie scheme,
823 // but requires it to be linear in byte offset.
824 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
825 UNSAFE_END
828 static inline void throw_new(JNIEnv *env, const char *ename) {
829 char buf[100];
830 strcpy(buf, "java/lang/");
831 strcat(buf, ename);
832 jclass cls = env->FindClass(buf);
833 char* msg = NULL;
834 env->ThrowNew(cls, msg);
835 }
837 static jclass Unsafe_DefineClass(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
838 {
839 // Code lifted from JDK 1.3 ClassLoader.c
841 jbyte *body;
842 char *utfName;
843 jclass result = 0;
844 char buf[128];
846 if (UsePerfData) {
847 ClassLoader::unsafe_defineClassCallCounter()->inc();
848 }
850 if (data == NULL) {
851 throw_new(env, "NullPointerException");
852 return 0;
853 }
855 /* Work around 4153825. malloc crashes on Solaris when passed a
856 * negative size.
857 */
858 if (length < 0) {
859 throw_new(env, "ArrayIndexOutOfBoundsException");
860 return 0;
861 }
863 body = NEW_C_HEAP_ARRAY(jbyte, length);
865 if (body == 0) {
866 throw_new(env, "OutOfMemoryError");
867 return 0;
868 }
870 env->GetByteArrayRegion(data, offset, length, body);
872 if (env->ExceptionOccurred())
873 goto free_body;
875 if (name != NULL) {
876 uint len = env->GetStringUTFLength(name);
877 int unicode_len = env->GetStringLength(name);
878 if (len >= sizeof(buf)) {
879 utfName = NEW_C_HEAP_ARRAY(char, len + 1);
880 if (utfName == NULL) {
881 throw_new(env, "OutOfMemoryError");
882 goto free_body;
883 }
884 } else {
885 utfName = buf;
886 }
887 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
888 //VerifyFixClassname(utfName);
889 for (uint i = 0; i < len; i++) {
890 if (utfName[i] == '.') utfName[i] = '/';
891 }
892 } else {
893 utfName = NULL;
894 }
896 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
898 if (utfName && utfName != buf)
899 FREE_C_HEAP_ARRAY(char, utfName);
901 free_body:
902 FREE_C_HEAP_ARRAY(jbyte, body);
903 return result;
904 }
905 }
908 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
909 UnsafeWrapper("Unsafe_DefineClass");
910 {
911 ThreadToNativeFromVM ttnfv(thread);
913 int depthFromDefineClass0 = 1;
914 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
915 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
916 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
918 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
919 }
920 UNSAFE_END
923 UNSAFE_ENTRY(jclass, Unsafe_DefineClass1(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
924 UnsafeWrapper("Unsafe_DefineClass");
925 {
926 ThreadToNativeFromVM ttnfv(thread);
928 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
929 }
930 UNSAFE_END
932 #define DAC_Args CLS"[B["OBJ
933 // define a class but do not make it known to the class loader or system dictionary
934 // - host_class: supplies context for linkage, access control, protection domain, and class loader
935 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
936 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
938 // When you load an anonymous class U, it works as if you changed its name just before loading,
939 // to a name that you will never use again. Since the name is lost, no other class can directly
940 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
941 // through java.lang.Class methods like Class.newInstance.
943 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
944 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
945 // An anonymous class also has special privileges to access any member of its host class.
946 // This is the main reason why this loading operation is unsafe. The purpose of this is to
947 // allow language implementations to simulate "open classes"; a host class in effect gets
948 // new code when an anonymous class is loaded alongside it. A less convenient but more
949 // standard way to do this is with reflection, which can also be set to ignore access
950 // restrictions.
952 // Access into an anonymous class is possible only through reflection. Therefore, there
953 // are no special access rules for calling into an anonymous class. The relaxed access
954 // rule for the host class is applied in the opposite direction: A host class reflectively
955 // access one of its anonymous classes.
957 // If you load the same bytecodes twice, you get two different classes. You can reload
958 // the same bytecodes with or without varying CP patches.
960 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
961 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
962 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
964 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
965 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
966 // It is not possible for a named class, or an older anonymous class, to refer by
967 // name (via its CP) to a newer anonymous class.
969 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
970 // or type descriptors used in the loaded anonymous class.
972 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
973 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
974 // be changed to println(greeting), where greeting is an arbitrary object created before
975 // the anonymous class is loaded. This is useful in dynamic languages, in which
976 // various kinds of metaobjects must be introduced as constants into bytecode.
977 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
978 // not just a literal string. For such ldc instructions, the verifier uses the
979 // type Object instead of String, if the loaded constant is not in fact a String.
981 static oop
982 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
983 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
984 HeapWord* *temp_alloc,
985 TRAPS) {
987 if (UsePerfData) {
988 ClassLoader::unsafe_defineClassCallCounter()->inc();
989 }
991 if (data == NULL) {
992 THROW_0(vmSymbols::java_lang_NullPointerException());
993 }
995 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
996 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
997 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length);
998 if (body == NULL) {
999 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1000 }
1002 // caller responsible to free it:
1003 (*temp_alloc) = body;
1005 {
1006 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1007 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1008 }
1010 u1* class_bytes = (u1*) body;
1011 int class_bytes_length = (int) length;
1012 if (class_bytes_length < 0) class_bytes_length = 0;
1013 if (class_bytes == NULL
1014 || host_class == NULL
1015 || length != class_bytes_length)
1016 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1018 objArrayHandle cp_patches_h;
1019 if (cp_patches_jh != NULL) {
1020 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1021 if (!p->is_objArray())
1022 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1023 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1024 }
1026 KlassHandle host_klass(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(host_class)));
1027 const char* host_source = host_klass->external_name();
1028 Handle host_loader(THREAD, host_klass->class_loader());
1029 Handle host_domain(THREAD, host_klass->protection_domain());
1031 GrowableArray<Handle>* cp_patches = NULL;
1032 if (cp_patches_h.not_null()) {
1033 int alen = cp_patches_h->length();
1034 for (int i = alen-1; i >= 0; i--) {
1035 oop p = cp_patches_h->obj_at(i);
1036 if (p != NULL) {
1037 Handle patch(THREAD, p);
1038 if (cp_patches == NULL)
1039 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1040 cp_patches->at_put(i, patch);
1041 }
1042 }
1043 }
1045 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1047 instanceKlassHandle anon_klass;
1048 {
1049 Symbol* no_class_name = NULL;
1050 klassOop anonk = SystemDictionary::parse_stream(no_class_name,
1051 host_loader, host_domain,
1052 &st, host_klass, cp_patches,
1053 CHECK_NULL);
1054 if (anonk == NULL) return NULL;
1055 anon_klass = instanceKlassHandle(THREAD, anonk);
1056 }
1058 // let caller initialize it as needed...
1060 return anon_klass->java_mirror();
1061 }
1063 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1064 {
1065 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1066 ResourceMark rm(THREAD);
1068 HeapWord* temp_alloc = NULL;
1070 jobject res_jh = NULL;
1072 { oop res_oop = Unsafe_DefineAnonymousClass_impl(env,
1073 host_class, data, cp_patches_jh,
1074 &temp_alloc, THREAD);
1075 if (res_oop != NULL)
1076 res_jh = JNIHandles::make_local(env, res_oop);
1077 }
1079 // try/finally clause:
1080 if (temp_alloc != NULL) {
1081 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc);
1082 }
1084 return (jclass) res_jh;
1085 }
1086 UNSAFE_END
1090 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1091 UnsafeWrapper("Unsafe_MonitorEnter");
1092 {
1093 if (jobj == NULL) {
1094 THROW(vmSymbols::java_lang_NullPointerException());
1095 }
1096 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1097 ObjectSynchronizer::jni_enter(obj, CHECK);
1098 }
1099 UNSAFE_END
1102 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1103 UnsafeWrapper("Unsafe_TryMonitorEnter");
1104 {
1105 if (jobj == NULL) {
1106 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1107 }
1108 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1109 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1110 return (res ? JNI_TRUE : JNI_FALSE);
1111 }
1112 UNSAFE_END
1115 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1116 UnsafeWrapper("Unsafe_MonitorExit");
1117 {
1118 if (jobj == NULL) {
1119 THROW(vmSymbols::java_lang_NullPointerException());
1120 }
1121 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1122 ObjectSynchronizer::jni_exit(obj(), CHECK);
1123 }
1124 UNSAFE_END
1127 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1128 UnsafeWrapper("Unsafe_ThrowException");
1129 {
1130 ThreadToNativeFromVM ttnfv(thread);
1131 env->Throw(thr);
1132 }
1133 UNSAFE_END
1135 // JSR166 ------------------------------------------------------------------
1137 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1138 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1139 oop x = JNIHandles::resolve(x_h);
1140 oop e = JNIHandles::resolve(e_h);
1141 oop p = JNIHandles::resolve(obj);
1142 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1143 if (UseCompressedOops) {
1144 update_barrier_set_pre((narrowOop*)addr, e);
1145 } else {
1146 update_barrier_set_pre((oop*)addr, e);
1147 }
1148 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e);
1149 jboolean success = (res == e);
1150 if (success)
1151 update_barrier_set((void*)addr, x);
1152 return success;
1153 UNSAFE_END
1155 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1156 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1157 oop p = JNIHandles::resolve(obj);
1158 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1159 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1160 UNSAFE_END
1162 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1163 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1164 Handle p (THREAD, JNIHandles::resolve(obj));
1165 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1166 if (VM_Version::supports_cx8())
1167 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1168 else {
1169 jboolean success = false;
1170 ObjectLocker ol(p, THREAD);
1171 if (*addr == e) { *addr = x; success = true; }
1172 return success;
1173 }
1174 UNSAFE_END
1176 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1177 UnsafeWrapper("Unsafe_Park");
1178 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1179 JavaThreadParkedState jtps(thread, time != 0);
1180 thread->parker()->park(isAbsolute != 0, time);
1181 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1182 UNSAFE_END
1184 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1185 UnsafeWrapper("Unsafe_Unpark");
1186 Parker* p = NULL;
1187 if (jthread != NULL) {
1188 oop java_thread = JNIHandles::resolve_non_null(jthread);
1189 if (java_thread != NULL) {
1190 jlong lp = java_lang_Thread::park_event(java_thread);
1191 if (lp != 0) {
1192 // This cast is OK even though the jlong might have been read
1193 // non-atomically on 32bit systems, since there, one word will
1194 // always be zero anyway and the value set is always the same
1195 p = (Parker*)addr_from_java(lp);
1196 } else {
1197 // Grab lock if apparently null or using older version of library
1198 MutexLocker mu(Threads_lock);
1199 java_thread = JNIHandles::resolve_non_null(jthread);
1200 if (java_thread != NULL) {
1201 JavaThread* thr = java_lang_Thread::thread(java_thread);
1202 if (thr != NULL) {
1203 p = thr->parker();
1204 if (p != NULL) { // Bind to Java thread for next time.
1205 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1206 }
1207 }
1208 }
1209 }
1210 }
1211 }
1212 if (p != NULL) {
1213 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1214 p->unpark();
1215 }
1216 UNSAFE_END
1218 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1219 UnsafeWrapper("Unsafe_Loadavg");
1220 const int max_nelem = 3;
1221 double la[max_nelem];
1222 jint ret;
1224 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1225 assert(a->is_typeArray(), "must be type array");
1227 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1228 ThreadToNativeFromVM ttnfv(thread);
1229 throw_new(env, "ArrayIndexOutOfBoundsException");
1230 return -1;
1231 }
1233 ret = os::loadavg(la, nelem);
1234 if (ret == -1) return -1;
1236 // if successful, ret is the number of samples actually retrieved.
1237 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1238 switch(ret) {
1239 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1240 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1241 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1242 }
1243 return ret;
1244 UNSAFE_END
1246 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1247 UnsafeWrapper("Unsafe_PrefetchRead");
1248 oop p = JNIHandles::resolve(obj);
1249 void* addr = index_oop_from_field_offset_long(p, 0);
1250 Prefetch::read(addr, (intx)offset);
1251 UNSAFE_END
1253 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1254 UnsafeWrapper("Unsafe_PrefetchWrite");
1255 oop p = JNIHandles::resolve(obj);
1256 void* addr = index_oop_from_field_offset_long(p, 0);
1257 Prefetch::write(addr, (intx)offset);
1258 UNSAFE_END
1261 /// JVM_RegisterUnsafeMethods
1263 #define ADR "J"
1265 #define LANG "Ljava/lang/"
1267 #define OBJ LANG"Object;"
1268 #define CLS LANG"Class;"
1269 #define CTR LANG"reflect/Constructor;"
1270 #define FLD LANG"reflect/Field;"
1271 #define MTH LANG"reflect/Method;"
1272 #define THR LANG"Throwable;"
1274 #define DC0_Args LANG"String;[BII"
1275 #define DC1_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1277 #define CC (char*) /*cast a literal from (const char*)*/
1278 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1280 // define deprecated accessors for compabitility with 1.4.0
1281 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1282 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1283 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1285 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1286 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1287 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1288 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1290 // Note: In 1.5.0, there are volatile versions too
1291 #define DECLARE_GETSETOOP(Boolean, Z) \
1292 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1293 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1294 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1295 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1298 #define DECLARE_GETSETNATIVE(Byte, B) \
1299 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1300 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1304 // %%% These are temporarily supported until the SDK sources
1305 // contain the necessarily updated Unsafe.java.
1306 static JNINativeMethod methods_140[] = {
1308 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)},
1309 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)},
1311 DECLARE_GETSETOOP_140(Boolean, Z),
1312 DECLARE_GETSETOOP_140(Byte, B),
1313 DECLARE_GETSETOOP_140(Short, S),
1314 DECLARE_GETSETOOP_140(Char, C),
1315 DECLARE_GETSETOOP_140(Int, I),
1316 DECLARE_GETSETOOP_140(Long, J),
1317 DECLARE_GETSETOOP_140(Float, F),
1318 DECLARE_GETSETOOP_140(Double, D),
1320 DECLARE_GETSETNATIVE(Byte, B),
1321 DECLARE_GETSETNATIVE(Short, S),
1322 DECLARE_GETSETNATIVE(Char, C),
1323 DECLARE_GETSETNATIVE(Int, I),
1324 DECLARE_GETSETNATIVE(Long, J),
1325 DECLARE_GETSETNATIVE(Float, F),
1326 DECLARE_GETSETNATIVE(Double, D),
1328 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1329 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1331 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1332 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1333 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1334 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1335 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1337 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, //deprecated
1338 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, //deprecated
1339 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1340 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1341 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1342 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1343 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1345 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1346 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1347 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1348 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1349 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1350 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1351 };
1353 // These are the old methods prior to the JSR 166 changes in 1.5.0
1354 static JNINativeMethod methods_141[] = {
1356 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1357 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1359 DECLARE_GETSETOOP_141(Boolean, Z),
1360 DECLARE_GETSETOOP_141(Byte, B),
1361 DECLARE_GETSETOOP_141(Short, S),
1362 DECLARE_GETSETOOP_141(Char, C),
1363 DECLARE_GETSETOOP_141(Int, I),
1364 DECLARE_GETSETOOP_141(Long, J),
1365 DECLARE_GETSETOOP_141(Float, F),
1366 DECLARE_GETSETOOP_141(Double, D),
1368 DECLARE_GETSETNATIVE(Byte, B),
1369 DECLARE_GETSETNATIVE(Short, S),
1370 DECLARE_GETSETNATIVE(Char, C),
1371 DECLARE_GETSETNATIVE(Int, I),
1372 DECLARE_GETSETNATIVE(Long, J),
1373 DECLARE_GETSETNATIVE(Float, F),
1374 DECLARE_GETSETNATIVE(Double, D),
1376 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1377 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1379 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1380 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1381 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1382 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1383 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1385 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1386 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1387 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1388 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1389 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1390 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1391 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1392 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1394 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1395 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1396 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1397 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1398 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1399 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1401 };
1403 // These are the old methods prior to the JSR 166 changes in 1.6.0
1404 static JNINativeMethod methods_15[] = {
1406 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1407 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1408 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1409 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1412 DECLARE_GETSETOOP(Boolean, Z),
1413 DECLARE_GETSETOOP(Byte, B),
1414 DECLARE_GETSETOOP(Short, S),
1415 DECLARE_GETSETOOP(Char, C),
1416 DECLARE_GETSETOOP(Int, I),
1417 DECLARE_GETSETOOP(Long, J),
1418 DECLARE_GETSETOOP(Float, F),
1419 DECLARE_GETSETOOP(Double, D),
1421 DECLARE_GETSETNATIVE(Byte, B),
1422 DECLARE_GETSETNATIVE(Short, S),
1423 DECLARE_GETSETNATIVE(Char, C),
1424 DECLARE_GETSETNATIVE(Int, I),
1425 DECLARE_GETSETNATIVE(Long, J),
1426 DECLARE_GETSETNATIVE(Float, F),
1427 DECLARE_GETSETNATIVE(Double, D),
1429 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1430 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1432 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1433 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1434 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1435 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1436 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1438 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1439 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1440 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1441 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1442 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1443 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1444 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1445 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1447 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1448 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1449 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1450 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1451 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1452 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1453 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1454 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1455 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1456 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1457 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1459 };
1461 // These are the correct methods, moving forward:
1462 static JNINativeMethod methods[] = {
1464 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1465 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1466 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1467 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1470 DECLARE_GETSETOOP(Boolean, Z),
1471 DECLARE_GETSETOOP(Byte, B),
1472 DECLARE_GETSETOOP(Short, S),
1473 DECLARE_GETSETOOP(Char, C),
1474 DECLARE_GETSETOOP(Int, I),
1475 DECLARE_GETSETOOP(Long, J),
1476 DECLARE_GETSETOOP(Float, F),
1477 DECLARE_GETSETOOP(Double, D),
1479 DECLARE_GETSETNATIVE(Byte, B),
1480 DECLARE_GETSETNATIVE(Short, S),
1481 DECLARE_GETSETNATIVE(Char, C),
1482 DECLARE_GETSETNATIVE(Int, I),
1483 DECLARE_GETSETNATIVE(Long, J),
1484 DECLARE_GETSETNATIVE(Float, F),
1485 DECLARE_GETSETNATIVE(Double, D),
1487 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1488 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1490 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1491 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1492 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1493 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1494 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1496 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1497 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1498 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1499 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1500 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1501 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1502 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1503 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1505 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1506 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1507 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1508 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1509 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1510 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1511 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1512 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1513 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1514 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1515 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1516 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1517 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1518 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1519 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1521 // {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)},
1523 // {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1524 // {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1525 // {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1526 // {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1528 };
1530 JNINativeMethod loadavg_method[] = {
1531 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1532 };
1534 JNINativeMethod prefetch_methods[] = {
1535 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1536 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1537 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1538 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1539 };
1541 JNINativeMethod memcopy_methods[] = {
1542 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1543 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1544 };
1546 JNINativeMethod memcopy_methods_15[] = {
1547 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1548 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1549 };
1551 JNINativeMethod anonk_methods[] = {
1552 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1553 };
1555 #undef CC
1556 #undef FN_PTR
1558 #undef ADR
1559 #undef LANG
1560 #undef OBJ
1561 #undef CLS
1562 #undef CTR
1563 #undef FLD
1564 #undef MTH
1565 #undef THR
1566 #undef DC0_Args
1567 #undef DC1_Args
1569 #undef DECLARE_GETSETOOP
1570 #undef DECLARE_GETSETNATIVE
1573 // This one function is exported, used by NativeLookup.
1574 // The Unsafe_xxx functions above are called only from the interpreter.
1575 // The optimizer looks at names and signatures to recognize
1576 // individual functions.
1578 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1579 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1580 {
1581 ThreadToNativeFromVM ttnfv(thread);
1582 {
1583 env->RegisterNatives(unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1584 if (env->ExceptionOccurred()) {
1585 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1586 tty->print_cr("Warning: SDK 1.6 Unsafe.loadavg not found.");
1587 }
1588 env->ExceptionClear();
1589 }
1590 }
1591 {
1592 env->RegisterNatives(unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1593 if (env->ExceptionOccurred()) {
1594 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1595 tty->print_cr("Warning: SDK 1.6 Unsafe.prefetchRead/Write not found.");
1596 }
1597 env->ExceptionClear();
1598 }
1599 }
1600 {
1601 env->RegisterNatives(unsafecls, memcopy_methods, sizeof(memcopy_methods)/sizeof(JNINativeMethod));
1602 if (env->ExceptionOccurred()) {
1603 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1604 tty->print_cr("Warning: SDK 1.7 Unsafe.copyMemory not found.");
1605 }
1606 env->ExceptionClear();
1607 env->RegisterNatives(unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1608 if (env->ExceptionOccurred()) {
1609 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1610 tty->print_cr("Warning: SDK 1.5 Unsafe.copyMemory not found.");
1611 }
1612 env->ExceptionClear();
1613 }
1614 }
1615 }
1616 if (EnableInvokeDynamic) {
1617 env->RegisterNatives(unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1618 if (env->ExceptionOccurred()) {
1619 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1620 tty->print_cr("Warning: SDK 1.7 Unsafe.defineClass (anonymous version) not found.");
1621 }
1622 env->ExceptionClear();
1623 }
1624 }
1625 int status = env->RegisterNatives(unsafecls, methods, sizeof(methods)/sizeof(JNINativeMethod));
1626 if (env->ExceptionOccurred()) {
1627 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1628 tty->print_cr("Warning: SDK 1.6 version of Unsafe not found.");
1629 }
1630 env->ExceptionClear();
1631 // %%% For now, be backward compatible with an older class:
1632 status = env->RegisterNatives(unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1633 }
1634 if (env->ExceptionOccurred()) {
1635 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1636 tty->print_cr("Warning: SDK 1.5 version of Unsafe not found.");
1637 }
1638 env->ExceptionClear();
1639 // %%% For now, be backward compatible with an older class:
1640 status = env->RegisterNatives(unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1641 }
1642 if (env->ExceptionOccurred()) {
1643 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1644 tty->print_cr("Warning: SDK 1.4.1 version of Unsafe not found.");
1645 }
1646 env->ExceptionClear();
1647 // %%% For now, be backward compatible with an older class:
1648 status = env->RegisterNatives(unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1649 }
1650 guarantee(status == 0, "register unsafe natives");
1651 }
1652 JVM_END
