1 /*
2 * Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "memory/allocation.inline.hpp"
29 #include "memory/resourceArea.hpp"
30 #include "oops/objArrayOop.inline.hpp"
31 #include "oops/oop.inline.hpp"
32 #include "prims/jni.h"
33 #include "prims/jvm.h"
34 #include "runtime/atomic.inline.hpp"
35 #include "runtime/globals.hpp"
36 #include "runtime/interfaceSupport.hpp"
37 #include "runtime/orderAccess.inline.hpp"
38 #include "runtime/reflection.hpp"
39 #include "runtime/vm_version.hpp"
40 #include "services/threadService.hpp"
41 #include "trace/tracing.hpp"
42 #include "utilities/copy.hpp"
43 #include "utilities/dtrace.hpp"
44 #include "utilities/macros.hpp"
45 #if INCLUDE_ALL_GCS
46 #include "gc/g1/g1SATBCardTableModRefBS.hpp"
47 #endif // INCLUDE_ALL_GCS
48
49 /*
50 * Implementation of class Unsafe
51 */
52
53
54 #define MAX_OBJECT_SIZE \
55 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
56 + ((julong)max_jint * sizeof(double)) )
57
58
59 #define UNSAFE_ENTRY(result_type, header) \
60 JVM_ENTRY(result_type, header)
61
62 // Can't use UNSAFE_LEAF because it has the signature of a straight
63 // call into the runtime (just like JVM_LEAF, funny that) but it's
64 // called like a Java Native and thus the wrapper built for it passes
65 // arguments like a JNI call. It expects those arguments to be popped
66 // from the stack on Intel like all good JNI args are, and adjusts the
67 // stack according. Since the JVM_LEAF call expects no extra
68 // arguments the stack isn't popped in the C code, is pushed by the
69 // wrapper and we get sick.
70 //#define UNSAFE_LEAF(result_type, header) \
71 // JVM_LEAF(result_type, header)
72
73 #define UNSAFE_END JVM_END
74
75 #define UnsafeWrapper(arg) /*nothing, for the present*/
76
77
78 inline void* addr_from_java(jlong addr) {
79 // This assert fails in a variety of ways on 32-bit systems.
80 // It is impossible to predict whether native code that converts
81 // pointers to longs will sign-extend or zero-extend the addresses.
82 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
83 return (void*)(uintptr_t)addr;
84 }
85
86 inline jlong addr_to_java(void* p) {
87 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
88 return (uintptr_t)p;
89 }
90
91
92 // Note: The VM's obj_field and related accessors use byte-scaled
93 // ("unscaled") offsets, just as the unsafe methods do.
94
95 // However, the method Unsafe.fieldOffset explicitly declines to
96 // guarantee this. The field offset values manipulated by the Java user
97 // through the Unsafe API are opaque cookies that just happen to be byte
98 // offsets. We represent this state of affairs by passing the cookies
99 // through conversion functions when going between the VM and the Unsafe API.
100 // The conversion functions just happen to be no-ops at present.
101
102 inline jlong field_offset_to_byte_offset(jlong field_offset) {
103 return field_offset;
104 }
105
106 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
107 return byte_offset;
108 }
109
110 inline jint invocation_key_from_method_slot(jint slot) {
111 return slot;
112 }
113
114 inline jint invocation_key_to_method_slot(jint key) {
115 return key;
116 }
117
118 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
119 jlong byte_offset = field_offset_to_byte_offset(field_offset);
120 #ifdef ASSERT
121 if (p != NULL) {
122 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
123 if (byte_offset == (jint)byte_offset) {
124 void* ptr_plus_disp = (address)p + byte_offset;
125 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
126 "raw [ptr+disp] must be consistent with oop::field_base");
127 }
128 jlong p_size = HeapWordSize * (jlong)(p->size());
129 assert(byte_offset < p_size, "Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size);
130 }
131 #endif
132 if (sizeof(char*) == sizeof(jint)) // (this constant folds!)
133 return (address)p + (jint) byte_offset;
134 else
135 return (address)p + byte_offset;
136 }
137
138 // Externally callable versions:
139 // (Use these in compiler intrinsics which emulate unsafe primitives.)
140 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
141 return field_offset;
142 }
143 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
144 return byte_offset;
145 }
146 jint Unsafe_invocation_key_from_method_slot(jint slot) {
147 return invocation_key_from_method_slot(slot);
148 }
149 jint Unsafe_invocation_key_to_method_slot(jint key) {
150 return invocation_key_to_method_slot(key);
151 }
152
153
154 ///// Data in the Java heap.
155
156 #define GET_FIELD(obj, offset, type_name, v) \
157 oop p = JNIHandles::resolve(obj); \
158 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
159
160 #define SET_FIELD(obj, offset, type_name, x) \
161 oop p = JNIHandles::resolve(obj); \
162 *(type_name*)index_oop_from_field_offset_long(p, offset) = x
163
164 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
165 oop p = JNIHandles::resolve(obj); \
166 if (support_IRIW_for_not_multiple_copy_atomic_cpu) { \
167 OrderAccess::fence(); \
168 } \
169 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
170
171 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
172 oop p = JNIHandles::resolve(obj); \
173 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x);
174
175
176 // Get/SetObject must be special-cased, since it works with handles.
177
178 // These functions allow a null base pointer with an arbitrary address.
179 // But if the base pointer is non-null, the offset should make some sense.
180 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
181 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
182 UnsafeWrapper("Unsafe_GetObject");
183 oop p = JNIHandles::resolve(obj);
184 oop v;
185 if (UseCompressedOops) {
186 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset);
187 v = oopDesc::decode_heap_oop(n);
188 } else {
189 v = *(oop*)index_oop_from_field_offset_long(p, offset);
190 }
191 jobject ret = JNIHandles::make_local(env, v);
192 #if INCLUDE_ALL_GCS
193 // We could be accessing the referent field in a reference
194 // object. If G1 is enabled then we need to register non-null
195 // referent with the SATB barrier.
196 if (UseG1GC) {
197 bool needs_barrier = false;
198
199 if (ret != NULL) {
200 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) {
201 oop o = JNIHandles::resolve(obj);
202 Klass* k = o->klass();
203 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
204 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
205 needs_barrier = true;
206 }
207 }
208 }
209
210 if (needs_barrier) {
211 oop referent = JNIHandles::resolve(ret);
212 G1SATBCardTableModRefBS::enqueue(referent);
213 }
214 }
215 #endif // INCLUDE_ALL_GCS
216 return ret;
217 UNSAFE_END
218
219 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
220 UnsafeWrapper("Unsafe_SetObject");
221 oop x = JNIHandles::resolve(x_h);
222 oop p = JNIHandles::resolve(obj);
223 if (UseCompressedOops) {
224 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
225 } else {
226 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
227 }
228 UNSAFE_END
229
230 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
231 UnsafeWrapper("Unsafe_GetObjectVolatile");
232 oop p = JNIHandles::resolve(obj);
233 void* addr = index_oop_from_field_offset_long(p, offset);
234 volatile oop v;
235 if (UseCompressedOops) {
236 volatile narrowOop n = *(volatile narrowOop*) addr;
237 (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n));
238 } else {
239 (void)const_cast<oop&>(v = *(volatile oop*) addr);
240 }
241 OrderAccess::acquire();
242 return JNIHandles::make_local(env, v);
243 UNSAFE_END
244
245 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
246 UnsafeWrapper("Unsafe_SetObjectVolatile");
247 oop x = JNIHandles::resolve(x_h);
248 oop p = JNIHandles::resolve(obj);
249 void* addr = index_oop_from_field_offset_long(p, offset);
250 OrderAccess::release();
251 if (UseCompressedOops) {
252 oop_store((narrowOop*)addr, x);
253 } else {
254 oop_store((oop*)addr, x);
255 }
256 OrderAccess::fence();
257 UNSAFE_END
258
259 UNSAFE_ENTRY(jobject, Unsafe_GetUncompressedObject(JNIEnv *env, jobject unsafe, jlong addr))
260 UnsafeWrapper("Unsafe_GetUncompressedObject");
261 oop v = *(oop*) (address) addr;
262 return JNIHandles::make_local(env, v);
263 UNSAFE_END
264
265 UNSAFE_ENTRY(jclass, Unsafe_GetJavaMirror(JNIEnv *env, jobject unsafe, jlong metaspace_klass))
266 UnsafeWrapper("Unsafe_GetJavaMirror");
267 Klass* klass = (Klass*) (address) metaspace_klass;
268 return (jclass) JNIHandles::make_local(klass->java_mirror());
269 UNSAFE_END
270
271 UNSAFE_ENTRY(jlong, Unsafe_GetKlassPointer(JNIEnv *env, jobject unsafe, jobject obj))
272 UnsafeWrapper("Unsafe_GetKlassPointer");
273 oop o = JNIHandles::resolve(obj);
274 jlong klass = (jlong) (address) o->klass();
275 return klass;
276 UNSAFE_END
277
278 #ifndef SUPPORTS_NATIVE_CX8
279
280 // VM_Version::supports_cx8() is a surrogate for 'supports atomic long memory ops'.
281 //
282 // On platforms which do not support atomic compare-and-swap of jlong (8 byte)
283 // values we have to use a lock-based scheme to enforce atomicity. This has to be
284 // applied to all Unsafe operations that set the value of a jlong field. Even so
285 // the compareAndSwapLong operation will not be atomic with respect to direct stores
286 // to the field from Java code. It is important therefore that any Java code that
287 // utilizes these Unsafe jlong operations does not perform direct stores. To permit
288 // direct loads of the field from Java code we must also use Atomic::store within the
289 // locked regions. And for good measure, in case there are direct stores, we also
290 // employ Atomic::load within those regions. Note that the field in question must be
291 // volatile and so must have atomic load/store accesses applied at the Java level.
292 //
293 // The locking scheme could utilize a range of strategies for controlling the locking
294 // granularity: from a lock per-field through to a single global lock. The latter is
295 // the simplest and is used for the current implementation. Note that the Java object
296 // that contains the field, can not, in general, be used for locking. To do so can lead
297 // to deadlocks as we may introduce locking into what appears to the Java code to be a
298 // lock-free path.
299 //
300 // As all the locked-regions are very short and themselves non-blocking we can treat
301 // them as leaf routines and elide safepoint checks (ie we don't perform any thread
302 // state transitions even when blocking for the lock). Note that if we do choose to
303 // add safepoint checks and thread state transitions, we must ensure that we calculate
304 // the address of the field _after_ we have acquired the lock, else the object may have
305 // been moved by the GC
306
307 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
308 UnsafeWrapper("Unsafe_GetLongVolatile");
309 {
310 if (VM_Version::supports_cx8()) {
311 GET_FIELD_VOLATILE(obj, offset, jlong, v);
312 return v;
313 }
314 else {
315 Handle p (THREAD, JNIHandles::resolve(obj));
316 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
317 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
318 jlong value = Atomic::load(addr);
319 return value;
320 }
321 }
322 UNSAFE_END
323
324 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
325 UnsafeWrapper("Unsafe_SetLongVolatile");
326 {
327 if (VM_Version::supports_cx8()) {
328 SET_FIELD_VOLATILE(obj, offset, jlong, x);
329 }
330 else {
331 Handle p (THREAD, JNIHandles::resolve(obj));
332 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
333 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
334 Atomic::store(x, addr);
335 }
336 }
337 UNSAFE_END
338
339 #endif // not SUPPORTS_NATIVE_CX8
340
341 UNSAFE_ENTRY(jboolean, Unsafe_isBigEndian0(JNIEnv *env, jobject unsafe))
342 UnsafeWrapper("Unsafe_IsBigEndian0");
343 {
344 #ifdef VM_LITTLE_ENDIAN
345 return false;
346 #else
347 return true;
348 #endif
349 }
350 UNSAFE_END
351
352 UNSAFE_ENTRY(jint, Unsafe_unalignedAccess0(JNIEnv *env, jobject unsafe))
353 UnsafeWrapper("Unsafe_UnalignedAccess0");
354 {
355 return UseUnalignedAccesses;
356 }
357 UNSAFE_END
358
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.
386
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);
395
396 #undef DEFINE_GETSETOOP
397
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.
412
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);
420
421 #ifdef SUPPORTS_NATIVE_CX8
422 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
423 #endif
424
425 #undef DEFINE_GETSETOOP_VOLATILE
426
427 // The non-intrinsified versions of setOrdered just use setVolatile
428
429 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
430 UnsafeWrapper("Unsafe_SetOrderedInt");
431 SET_FIELD_VOLATILE(obj, offset, jint, x);
432 UNSAFE_END
433
434 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
435 UnsafeWrapper("Unsafe_SetOrderedObject");
436 oop x = JNIHandles::resolve(x_h);
437 oop p = JNIHandles::resolve(obj);
438 void* addr = index_oop_from_field_offset_long(p, offset);
439 OrderAccess::release();
440 if (UseCompressedOops) {
441 oop_store((narrowOop*)addr, x);
442 } else {
443 oop_store((oop*)addr, x);
444 }
445 OrderAccess::fence();
446 UNSAFE_END
447
448 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
449 UnsafeWrapper("Unsafe_SetOrderedLong");
450 #ifdef SUPPORTS_NATIVE_CX8
451 SET_FIELD_VOLATILE(obj, offset, jlong, x);
452 #else
453 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
454 {
455 if (VM_Version::supports_cx8()) {
456 SET_FIELD_VOLATILE(obj, offset, jlong, x);
457 }
458 else {
459 Handle p (THREAD, JNIHandles::resolve(obj));
460 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
461 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
462 Atomic::store(x, addr);
463 }
464 }
465 #endif
466 UNSAFE_END
467
468 UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe))
469 UnsafeWrapper("Unsafe_LoadFence");
470 OrderAccess::acquire();
471 UNSAFE_END
472
473 UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe))
474 UnsafeWrapper("Unsafe_StoreFence");
475 OrderAccess::release();
476 UNSAFE_END
477
478 UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe))
479 UnsafeWrapper("Unsafe_FullFence");
480 OrderAccess::fence();
481 UNSAFE_END
482
483 ////// Data in the C heap.
484
485 // Note: These do not throw NullPointerException for bad pointers.
486 // They just crash. Only a oop base pointer can generate a NullPointerException.
487 //
488 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
489 \
490 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
491 UnsafeWrapper("Unsafe_GetNative"#Type); \
492 void* p = addr_from_java(addr); \
493 JavaThread* t = JavaThread::current(); \
494 t->set_doing_unsafe_access(true); \
495 java_type x = *(volatile native_type*)p; \
496 t->set_doing_unsafe_access(false); \
497 return x; \
498 UNSAFE_END \
499 \
500 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
501 UnsafeWrapper("Unsafe_SetNative"#Type); \
502 JavaThread* t = JavaThread::current(); \
503 t->set_doing_unsafe_access(true); \
504 void* p = addr_from_java(addr); \
505 *(volatile native_type*)p = x; \
506 t->set_doing_unsafe_access(false); \
507 UNSAFE_END \
508 \
509 // END DEFINE_GETSETNATIVE.
510
511 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
512 DEFINE_GETSETNATIVE(jshort, Short, signed short);
513 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
514 DEFINE_GETSETNATIVE(jint, Int, jint);
515 // no long -- handled specially
516 DEFINE_GETSETNATIVE(jfloat, Float, float);
517 DEFINE_GETSETNATIVE(jdouble, Double, double);
518
519 #undef DEFINE_GETSETNATIVE
520
521 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
522 UnsafeWrapper("Unsafe_GetNativeLong");
523 JavaThread* t = JavaThread::current();
524 // We do it this way to avoid problems with access to heap using 64
525 // bit loads, as jlong in heap could be not 64-bit aligned, and on
526 // some CPUs (SPARC) it leads to SIGBUS.
527 t->set_doing_unsafe_access(true);
528 void* p = addr_from_java(addr);
529 jlong x;
530 if (((intptr_t)p & 7) == 0) {
531 // jlong is aligned, do a volatile access
532 x = *(volatile jlong*)p;
533 } else {
534 jlong_accessor acc;
535 acc.words[0] = ((volatile jint*)p)[0];
536 acc.words[1] = ((volatile jint*)p)[1];
537 x = acc.long_value;
538 }
539 t->set_doing_unsafe_access(false);
540 return x;
541 UNSAFE_END
542
543 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
544 UnsafeWrapper("Unsafe_SetNativeLong");
545 JavaThread* t = JavaThread::current();
546 // see comment for Unsafe_GetNativeLong
547 t->set_doing_unsafe_access(true);
548 void* p = addr_from_java(addr);
549 if (((intptr_t)p & 7) == 0) {
550 // jlong is aligned, do a volatile access
551 *(volatile jlong*)p = x;
552 } else {
553 jlong_accessor acc;
554 acc.long_value = x;
555 ((volatile jint*)p)[0] = acc.words[0];
556 ((volatile jint*)p)[1] = acc.words[1];
557 }
558 t->set_doing_unsafe_access(false);
559 UNSAFE_END
560
561
562 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
563 UnsafeWrapper("Unsafe_GetNativeAddress");
564 void* p = addr_from_java(addr);
565 return addr_to_java(*(void**)p);
566 UNSAFE_END
567
568 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
569 UnsafeWrapper("Unsafe_SetNativeAddress");
570 void* p = addr_from_java(addr);
571 *(void**)p = addr_from_java(x);
572 UNSAFE_END
573
574
575 ////// Allocation requests
576
577 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
578 UnsafeWrapper("Unsafe_AllocateInstance");
579 {
580 ThreadToNativeFromVM ttnfv(thread);
581 return env->AllocObject(cls);
582 }
583 UNSAFE_END
584
585 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
586 UnsafeWrapper("Unsafe_AllocateMemory");
587 size_t sz = (size_t)size;
588 if (sz != (julong)size || size < 0) {
589 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
590 }
591 if (sz == 0) {
592 return 0;
593 }
594 sz = round_to(sz, HeapWordSize);
595 void* x = os::malloc(sz, mtInternal);
596 if (x == NULL) {
597 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
598 }
599 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
600 return addr_to_java(x);
601 UNSAFE_END
602
603 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
604 UnsafeWrapper("Unsafe_ReallocateMemory");
605 void* p = addr_from_java(addr);
606 size_t sz = (size_t)size;
607 if (sz != (julong)size || size < 0) {
608 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
609 }
610 if (sz == 0) {
611 os::free(p);
612 return 0;
613 }
614 sz = round_to(sz, HeapWordSize);
615 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal);
616 if (x == NULL) {
617 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
618 }
619 return addr_to_java(x);
620 UNSAFE_END
621
622 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
623 UnsafeWrapper("Unsafe_FreeMemory");
624 void* p = addr_from_java(addr);
625 if (p == NULL) {
626 return;
627 }
628 os::free(p);
629 UNSAFE_END
630
631 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
632 UnsafeWrapper("Unsafe_SetMemory");
633 size_t sz = (size_t)size;
634 if (sz != (julong)size || size < 0) {
635 THROW(vmSymbols::java_lang_IllegalArgumentException());
636 }
637 oop base = JNIHandles::resolve(obj);
638 void* p = index_oop_from_field_offset_long(base, offset);
639 Copy::fill_to_memory_atomic(p, sz, value);
640 UNSAFE_END
641
642 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
643 UnsafeWrapper("Unsafe_CopyMemory");
644 if (size == 0) {
645 return;
646 }
647 size_t sz = (size_t)size;
648 if (sz != (julong)size || size < 0) {
649 THROW(vmSymbols::java_lang_IllegalArgumentException());
650 }
651 oop srcp = JNIHandles::resolve(srcObj);
652 oop dstp = JNIHandles::resolve(dstObj);
653 if (dstp != NULL && !dstp->is_typeArray()) {
654 // NYI: This works only for non-oop arrays at present.
655 // Generalizing it would be reasonable, but requires card marking.
656 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
657 THROW(vmSymbols::java_lang_IllegalArgumentException());
658 }
659 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
660 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
661 Copy::conjoint_memory_atomic(src, dst, sz);
662 UNSAFE_END
663
664 // This function is a leaf since if the source and destination are both in native memory
665 // the copy may potentially be very large, and we don't want to disable GC if we can avoid it.
666 // If either source or destination (or both) are on the heap, the function will enter VM using
667 // JVM_ENTRY_FROM_LEAF
668 JVM_LEAF(void, Unsafe_CopySwapMemory0(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size, jlong elemSize)) {
669 UnsafeWrapper("Unsafe_CopySwapMemory0");
670
671 size_t sz = (size_t)size;
672 size_t esz = (size_t)elemSize;
673
674 if (srcObj == NULL && dstObj == NULL) {
675 // Both src & dst are in native memory
676 address src = (address)srcOffset;
677 address dst = (address)dstOffset;
678
679 Copy::conjoint_swap(src, dst, sz, esz);
680 } else {
681 // At least one of src/dst are on heap, transition to VM to access raw pointers
682
683 JVM_ENTRY_FROM_LEAF(env, void, Unsafe_CopySwapMemory0) {
684 oop srcp = JNIHandles::resolve(srcObj);
685 oop dstp = JNIHandles::resolve(dstObj);
686
687 address src = (address)index_oop_from_field_offset_long(srcp, srcOffset);
688 address dst = (address)index_oop_from_field_offset_long(dstp, dstOffset);
689
690 Copy::conjoint_swap(src, dst, sz, esz);
691 } JVM_END
692 }
693 } JVM_END
694
695 ////// Random queries
696
697 // See comment at file start about UNSAFE_LEAF
698 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
699 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
700 UnsafeWrapper("Unsafe_AddressSize");
701 return sizeof(void*);
702 UNSAFE_END
703
704 // See comment at file start about UNSAFE_LEAF
705 //UNSAFE_LEAF(jint, Unsafe_PageSize())
706 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
707 UnsafeWrapper("Unsafe_PageSize");
708 return os::vm_page_size();
709 UNSAFE_END
710
711 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
712 if (field == NULL) {
713 THROW_0(vmSymbols::java_lang_NullPointerException());
714 }
715
716 oop reflected = JNIHandles::resolve_non_null(field);
717 oop mirror = java_lang_reflect_Field::clazz(reflected);
718 Klass* k = java_lang_Class::as_Klass(mirror);
719 int slot = java_lang_reflect_Field::slot(reflected);
720 int modifiers = java_lang_reflect_Field::modifiers(reflected);
721
722 if (must_be_static >= 0) {
723 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
724 if (must_be_static != really_is_static) {
725 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
726 }
727 }
728
729 int offset = InstanceKlass::cast(k)->field_offset(slot);
730 return field_offset_from_byte_offset(offset);
731 }
732
733 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
734 UnsafeWrapper("Unsafe_ObjectFieldOffset");
735 return find_field_offset(field, 0, THREAD);
736 UNSAFE_END
737
738 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
739 UnsafeWrapper("Unsafe_StaticFieldOffset");
740 return find_field_offset(field, 1, THREAD);
741 UNSAFE_END
742
743 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
744 UnsafeWrapper("Unsafe_StaticFieldBase");
745 // Note: In this VM implementation, a field address is always a short
746 // offset from the base of a a klass metaobject. Thus, the full dynamic
747 // range of the return type is never used. However, some implementations
748 // might put the static field inside an array shared by many classes,
749 // or even at a fixed address, in which case the address could be quite
750 // large. In that last case, this function would return NULL, since
751 // the address would operate alone, without any base pointer.
752
753 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
754
755 oop reflected = JNIHandles::resolve_non_null(field);
756 oop mirror = java_lang_reflect_Field::clazz(reflected);
757 int modifiers = java_lang_reflect_Field::modifiers(reflected);
758
759 if ((modifiers & JVM_ACC_STATIC) == 0) {
760 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
761 }
762
763 return JNIHandles::make_local(env, mirror);
764 UNSAFE_END
765
766 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
767 UnsafeWrapper("Unsafe_EnsureClassInitialized");
768 if (clazz == NULL) {
769 THROW(vmSymbols::java_lang_NullPointerException());
770 }
771 oop mirror = JNIHandles::resolve_non_null(clazz);
772
773 Klass* klass = java_lang_Class::as_Klass(mirror);
774 if (klass != NULL && klass->should_be_initialized()) {
775 InstanceKlass* k = InstanceKlass::cast(klass);
776 k->initialize(CHECK);
777 }
778 }
779 UNSAFE_END
780
781 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
782 UnsafeWrapper("Unsafe_ShouldBeInitialized");
783 if (clazz == NULL) {
784 THROW_(vmSymbols::java_lang_NullPointerException(), false);
785 }
786 oop mirror = JNIHandles::resolve_non_null(clazz);
787 Klass* klass = java_lang_Class::as_Klass(mirror);
788 if (klass != NULL && klass->should_be_initialized()) {
789 return true;
790 }
791 return false;
792 }
793 UNSAFE_END
794
795 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
796 if (acls == NULL) {
797 THROW(vmSymbols::java_lang_NullPointerException());
798 }
799 oop mirror = JNIHandles::resolve_non_null(acls);
800 Klass* k = java_lang_Class::as_Klass(mirror);
801 if (k == NULL || !k->is_array_klass()) {
802 THROW(vmSymbols::java_lang_InvalidClassException());
803 } else if (k->is_objArray_klass()) {
804 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
805 scale = heapOopSize;
806 } else if (k->is_typeArray_klass()) {
807 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
808 base = tak->array_header_in_bytes();
809 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
810 scale = (1 << tak->log2_element_size());
811 } else {
812 ShouldNotReachHere();
813 }
814 }
815
816 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
817 UnsafeWrapper("Unsafe_ArrayBaseOffset");
818 int base = 0, scale = 0;
819 getBaseAndScale(base, scale, acls, CHECK_0);
820 return field_offset_from_byte_offset(base);
821 UNSAFE_END
822
823
824 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
825 UnsafeWrapper("Unsafe_ArrayIndexScale");
826 int base = 0, scale = 0;
827 getBaseAndScale(base, scale, acls, CHECK_0);
828 // This VM packs both fields and array elements down to the byte.
829 // But watch out: If this changes, so that array references for
830 // a given primitive type (say, T_BOOLEAN) use different memory units
831 // than fields, this method MUST return zero for such arrays.
832 // For example, the VM used to store sub-word sized fields in full
833 // words in the object layout, so that accessors like getByte(Object,int)
834 // did not really do what one might expect for arrays. Therefore,
835 // this function used to report a zero scale factor, so that the user
836 // would know not to attempt to access sub-word array elements.
837 // // Code for unpacked fields:
838 // if (scale < wordSize) return 0;
839
840 // The following allows for a pretty general fieldOffset cookie scheme,
841 // but requires it to be linear in byte offset.
842 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
843 UNSAFE_END
844
845
846 static inline void throw_new(JNIEnv *env, const char *ename) {
847 char buf[100];
848 jio_snprintf(buf, 100, "%s%s", "java/lang/", ename);
849 jclass cls = env->FindClass(buf);
850 if (env->ExceptionCheck()) {
851 env->ExceptionClear();
852 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf);
853 return;
854 }
855 char* msg = NULL;
856 env->ThrowNew(cls, msg);
857 }
858
859 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
860 {
861 // Code lifted from JDK 1.3 ClassLoader.c
862
863 jbyte *body;
864 char *utfName;
865 jclass result = 0;
866 char buf[128];
867
868 if (UsePerfData) {
869 ClassLoader::unsafe_defineClassCallCounter()->inc();
870 }
871
872 if (data == NULL) {
873 throw_new(env, "NullPointerException");
874 return 0;
875 }
876
877 /* Work around 4153825. malloc crashes on Solaris when passed a
878 * negative size.
879 */
880 if (length < 0) {
881 throw_new(env, "ArrayIndexOutOfBoundsException");
882 return 0;
883 }
884
885 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
886
887 if (body == 0) {
888 throw_new(env, "OutOfMemoryError");
889 return 0;
890 }
891
892 env->GetByteArrayRegion(data, offset, length, body);
893
894 if (env->ExceptionOccurred())
895 goto free_body;
896
897 if (name != NULL) {
898 uint len = env->GetStringUTFLength(name);
899 int unicode_len = env->GetStringLength(name);
900 if (len >= sizeof(buf)) {
901 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
902 if (utfName == NULL) {
903 throw_new(env, "OutOfMemoryError");
904 goto free_body;
905 }
906 } else {
907 utfName = buf;
908 }
909 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
910 //VerifyFixClassname(utfName);
911 for (uint i = 0; i < len; i++) {
912 if (utfName[i] == '.') utfName[i] = '/';
913 }
914 } else {
915 utfName = NULL;
916 }
917
918 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
919
920 if (utfName && utfName != buf)
921 FREE_C_HEAP_ARRAY(char, utfName);
922
923 free_body:
924 FREE_C_HEAP_ARRAY(jbyte, body);
925 return result;
926 }
927 }
928
929
930 UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
931 UnsafeWrapper("Unsafe_DefineClass");
932 {
933 ThreadToNativeFromVM ttnfv(thread);
934 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
935 }
936 UNSAFE_END
937
938
939 // define a class but do not make it known to the class loader or system dictionary
940 // - host_class: supplies context for linkage, access control, protection domain, and class loader
941 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
942 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
943
944 // When you load an anonymous class U, it works as if you changed its name just before loading,
945 // to a name that you will never use again. Since the name is lost, no other class can directly
946 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
947 // through java.lang.Class methods like Class.newInstance.
948
949 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
950 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
951 // An anonymous class also has special privileges to access any member of its host class.
952 // This is the main reason why this loading operation is unsafe. The purpose of this is to
953 // allow language implementations to simulate "open classes"; a host class in effect gets
954 // new code when an anonymous class is loaded alongside it. A less convenient but more
955 // standard way to do this is with reflection, which can also be set to ignore access
956 // restrictions.
957
958 // Access into an anonymous class is possible only through reflection. Therefore, there
959 // are no special access rules for calling into an anonymous class. The relaxed access
960 // rule for the host class is applied in the opposite direction: A host class reflectively
961 // access one of its anonymous classes.
962
963 // If you load the same bytecodes twice, you get two different classes. You can reload
964 // the same bytecodes with or without varying CP patches.
965
966 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
967 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
968 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
969
970 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
971 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
972 // It is not possible for a named class, or an older anonymous class, to refer by
973 // name (via its CP) to a newer anonymous class.
974
975 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
976 // or type descriptors used in the loaded anonymous class.
977
978 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
979 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
980 // be changed to println(greeting), where greeting is an arbitrary object created before
981 // the anonymous class is loaded. This is useful in dynamic languages, in which
982 // various kinds of metaobjects must be introduced as constants into bytecode.
983 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
984 // not just a literal string. For such ldc instructions, the verifier uses the
985 // type Object instead of String, if the loaded constant is not in fact a String.
986
987 static instanceKlassHandle
988 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
989 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
990 HeapWord* *temp_alloc,
991 TRAPS) {
992
993 if (UsePerfData) {
994 ClassLoader::unsafe_defineClassCallCounter()->inc();
995 }
996
997 if (data == NULL) {
998 THROW_0(vmSymbols::java_lang_NullPointerException());
999 }
1000
1001 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
1002 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
1003 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal);
1004 if (body == NULL) {
1005 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1006 }
1007
1008 // caller responsible to free it:
1009 (*temp_alloc) = body;
1010
1011 {
1012 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1013 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1014 }
1015
1016 u1* class_bytes = (u1*) body;
1017 int class_bytes_length = (int) length;
1018 if (class_bytes_length < 0) class_bytes_length = 0;
1019 if (class_bytes == NULL
1020 || host_class == NULL
1021 || length != class_bytes_length)
1022 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1023
1024 objArrayHandle cp_patches_h;
1025 if (cp_patches_jh != NULL) {
1026 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1027 if (!p->is_objArray())
1028 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1029 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1030 }
1031
1032 const Klass* host_klass = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class));
1033 assert(host_klass != NULL, "invariant");
1034
1035 const char* host_source = host_klass->external_name();
1036 Handle host_loader(THREAD, host_klass->class_loader());
1037 Handle host_domain(THREAD, host_klass->protection_domain());
1038
1039 GrowableArray<Handle>* cp_patches = NULL;
1040 if (cp_patches_h.not_null()) {
1041 int alen = cp_patches_h->length();
1042 for (int i = alen-1; i >= 0; i--) {
1043 oop p = cp_patches_h->obj_at(i);
1044 if (p != NULL) {
1045 Handle patch(THREAD, p);
1046 if (cp_patches == NULL)
1047 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1048 cp_patches->at_put(i, patch);
1049 }
1050 }
1051 }
1052
1053 ClassFileStream st(class_bytes,
1054 class_bytes_length,
1055 host_source,
1056 ClassFileStream::verify);
1057
1058 instanceKlassHandle anon_klass;
1059 {
1060 Symbol* no_class_name = NULL;
1061 Klass* anonk = SystemDictionary::parse_stream(no_class_name,
1062 host_loader,
1063 host_domain,
1064 &st,
1065 host_klass,
1066 cp_patches,
1067 CHECK_NULL);
1068 if (anonk == NULL) return NULL;
1069 anon_klass = instanceKlassHandle(THREAD, anonk);
1070 }
1071
1072 return anon_klass;
1073 }
1074
1075 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1076 {
1077 instanceKlassHandle anon_klass;
1078 jobject res_jh = NULL;
1079
1080 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1081 ResourceMark rm(THREAD);
1082
1083 HeapWord* temp_alloc = NULL;
1084
1085 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data,
1086 cp_patches_jh,
1087 &temp_alloc, THREAD);
1088 if (anon_klass() != NULL)
1089 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
1090
1091 // try/finally clause:
1092 if (temp_alloc != NULL) {
1093 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc);
1094 }
1095
1096 // The anonymous class loader data has been artificially been kept alive to
1097 // this point. The mirror and any instances of this class have to keep
1098 // it alive afterwards.
1099 if (anon_klass() != NULL) {
1100 anon_klass->class_loader_data()->set_keep_alive(false);
1101 }
1102
1103 // let caller initialize it as needed...
1104
1105 return (jclass) res_jh;
1106 }
1107 UNSAFE_END
1108
1109
1110
1111 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1112 UnsafeWrapper("Unsafe_ThrowException");
1113 {
1114 ThreadToNativeFromVM ttnfv(thread);
1115 env->Throw(thr);
1116 }
1117 UNSAFE_END
1118
1119 // JSR166 ------------------------------------------------------------------
1120
1121 UNSAFE_ENTRY(jobject, Unsafe_CompareAndExchangeObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1122 UnsafeWrapper("Unsafe_CompareAndExchangeObject");
1123 oop x = JNIHandles::resolve(x_h);
1124 oop e = JNIHandles::resolve(e_h);
1125 oop p = JNIHandles::resolve(obj);
1126 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1127 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
1128 if (res == e)
1129 update_barrier_set((void*)addr, x);
1130 return JNIHandles::make_local(env, res);
1131 UNSAFE_END
1132
1133 UNSAFE_ENTRY(jint, Unsafe_CompareAndExchangeInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1134 UnsafeWrapper("Unsafe_CompareAndExchangeInt");
1135 oop p = JNIHandles::resolve(obj);
1136 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1137 return (jint)(Atomic::cmpxchg(x, addr, e));
1138 UNSAFE_END
1139
1140 UNSAFE_ENTRY(jlong, Unsafe_CompareAndExchangeLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1141 UnsafeWrapper("Unsafe_CompareAndExchangeLong");
1142 Handle p (THREAD, JNIHandles::resolve(obj));
1143 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1144 #ifdef SUPPORTS_NATIVE_CX8
1145 return (jlong)(Atomic::cmpxchg(x, addr, e));
1146 #else
1147 if (VM_Version::supports_cx8())
1148 return (jlong)(Atomic::cmpxchg(x, addr, e));
1149 else {
1150 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
1151 jlong val = Atomic::load(addr);
1152 if (val == e)
1153 Atomic::store(x, addr);
1154 return val;
1155 }
1156 #endif
1157 UNSAFE_END
1158
1159 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1160 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1161 oop x = JNIHandles::resolve(x_h);
1162 oop e = JNIHandles::resolve(e_h);
1163 oop p = JNIHandles::resolve(obj);
1164 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1165 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
1166 jboolean success = (res == e);
1167 if (success)
1168 update_barrier_set((void*)addr, x);
1169 return success;
1170 UNSAFE_END
1171
1172 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1173 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1174 oop p = JNIHandles::resolve(obj);
1175 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1176 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1177 UNSAFE_END
1178
1179 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1180 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1181 Handle p (THREAD, JNIHandles::resolve(obj));
1182 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1183 #ifdef SUPPORTS_NATIVE_CX8
1184 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1185 #else
1186 if (VM_Version::supports_cx8())
1187 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1188 else {
1189 jboolean success = false;
1190 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
1191 jlong val = Atomic::load(addr);
1192 if (val == e) { Atomic::store(x, addr); success = true; }
1193 return success;
1194 }
1195 #endif
1196 UNSAFE_END
1197
1198 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1199 UnsafeWrapper("Unsafe_Park");
1200 EventThreadPark event;
1201 HOTSPOT_THREAD_PARK_BEGIN((uintptr_t) thread->parker(), (int) isAbsolute, time);
1202
1203 JavaThreadParkedState jtps(thread, time != 0);
1204 thread->parker()->park(isAbsolute != 0, time);
1205
1206 HOTSPOT_THREAD_PARK_END((uintptr_t) thread->parker());
1207 if (event.should_commit()) {
1208 oop obj = thread->current_park_blocker();
1209 event.set_klass((obj != NULL) ? obj->klass() : NULL);
1210 event.set_timeout(time);
1211 event.set_address((obj != NULL) ? (TYPE_ADDRESS) cast_from_oop<uintptr_t>(obj) : 0);
1212 event.commit();
1213 }
1214 UNSAFE_END
1215
1216 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1217 UnsafeWrapper("Unsafe_Unpark");
1218 Parker* p = NULL;
1219 if (jthread != NULL) {
1220 oop java_thread = JNIHandles::resolve_non_null(jthread);
1221 if (java_thread != NULL) {
1222 jlong lp = java_lang_Thread::park_event(java_thread);
1223 if (lp != 0) {
1224 // This cast is OK even though the jlong might have been read
1225 // non-atomically on 32bit systems, since there, one word will
1226 // always be zero anyway and the value set is always the same
1227 p = (Parker*)addr_from_java(lp);
1228 } else {
1229 // Grab lock if apparently null or using older version of library
1230 MutexLocker mu(Threads_lock);
1231 java_thread = JNIHandles::resolve_non_null(jthread);
1232 if (java_thread != NULL) {
1233 JavaThread* thr = java_lang_Thread::thread(java_thread);
1234 if (thr != NULL) {
1235 p = thr->parker();
1236 if (p != NULL) { // Bind to Java thread for next time.
1237 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1238 }
1239 }
1240 }
1241 }
1242 }
1243 }
1244 if (p != NULL) {
1245 HOTSPOT_THREAD_UNPARK((uintptr_t) p);
1246 p->unpark();
1247 }
1248 UNSAFE_END
1249
1250 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1251 UnsafeWrapper("Unsafe_Loadavg");
1252 const int max_nelem = 3;
1253 double la[max_nelem];
1254 jint ret;
1255
1256 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1257 assert(a->is_typeArray(), "must be type array");
1258
1259 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1260 ThreadToNativeFromVM ttnfv(thread);
1261 throw_new(env, "ArrayIndexOutOfBoundsException");
1262 return -1;
1263 }
1264
1265 ret = os::loadavg(la, nelem);
1266 if (ret == -1) return -1;
1267
1268 // if successful, ret is the number of samples actually retrieved.
1269 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1270 switch(ret) {
1271 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1272 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1273 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1274 }
1275 return ret;
1276 UNSAFE_END
1277
1278
1279 /// JVM_RegisterUnsafeMethods
1280
1281 #define ADR "J"
1282
1283 #define LANG "Ljava/lang/"
1284
1285 #define OBJ LANG "Object;"
1286 #define CLS LANG "Class;"
1287 #define FLD LANG "reflect/Field;"
1288 #define THR LANG "Throwable;"
1289
1290 #define DC_Args LANG "String;[BII" LANG "ClassLoader;" "Ljava/security/ProtectionDomain;"
1291 #define DAC_Args CLS "[B[" OBJ
1292
1293 #define CC (char*) /*cast a literal from (const char*)*/
1294 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1295
1296 #define DECLARE_GETPUTOOP(Boolean, Z) \
1297 {CC "get" #Boolean, CC "(" OBJ "J)" #Z, FN_PTR(Unsafe_Get##Boolean)}, \
1298 {CC "put" #Boolean, CC "(" OBJ "J" #Z ")V", FN_PTR(Unsafe_Set##Boolean)}, \
1299 {CC "get" #Boolean "Volatile", CC "(" OBJ "J)" #Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1300 {CC "put" #Boolean "Volatile", CC "(" OBJ "J" #Z ")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1301
1302
1303 #define DECLARE_GETPUTNATIVE(Byte, B) \
1304 {CC "get" #Byte, CC "(" ADR ")" #B, FN_PTR(Unsafe_GetNative##Byte)}, \
1305 {CC "put" #Byte, CC "(" ADR#B ")V", FN_PTR(Unsafe_SetNative##Byte)}
1306
1307
1308 static JNINativeMethod sun_misc_Unsafe_methods[] = {
1309 {CC "getObject", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObject)},
1310 {CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObject)},
1311 {CC "getObjectVolatile",CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObjectVolatile)},
1312 {CC "putObjectVolatile",CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1313
1314 {CC "getUncompressedObject", CC "(" ADR ")" OBJ, FN_PTR(Unsafe_GetUncompressedObject)},
1315 {CC "getJavaMirror", CC "(" ADR ")" CLS, FN_PTR(Unsafe_GetJavaMirror)},
1316 {CC "getKlassPointer", CC "(" OBJ ")" ADR, FN_PTR(Unsafe_GetKlassPointer)},
1317
1318 DECLARE_GETPUTOOP(Boolean, Z),
1319 DECLARE_GETPUTOOP(Byte, B),
1320 DECLARE_GETPUTOOP(Short, S),
1321 DECLARE_GETPUTOOP(Char, C),
1322 DECLARE_GETPUTOOP(Int, I),
1323 DECLARE_GETPUTOOP(Long, J),
1324 DECLARE_GETPUTOOP(Float, F),
1325 DECLARE_GETPUTOOP(Double, D),
1326
1327 DECLARE_GETPUTNATIVE(Byte, B),
1328 DECLARE_GETPUTNATIVE(Short, S),
1329 DECLARE_GETPUTNATIVE(Char, C),
1330 DECLARE_GETPUTNATIVE(Int, I),
1331 DECLARE_GETPUTNATIVE(Long, J),
1332 DECLARE_GETPUTNATIVE(Float, F),
1333 DECLARE_GETPUTNATIVE(Double, D),
1334
1335 {CC "getAddress", CC "(" ADR ")" ADR, FN_PTR(Unsafe_GetNativeAddress)},
1336 {CC "putAddress", CC "(" ADR "" ADR ")V", FN_PTR(Unsafe_SetNativeAddress)},
1337
1338 {CC "allocateMemory", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory)},
1339 {CC "reallocateMemory", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory)},
1340 {CC "freeMemory", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory)},
1341
1342 {CC "objectFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1343 {CC "staticFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset)},
1344 {CC "staticFieldBase", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1345 {CC "ensureClassInitialized",CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1346 {CC "arrayBaseOffset", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1347 {CC "arrayIndexScale", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale)},
1348 {CC "addressSize", CC "()I", FN_PTR(Unsafe_AddressSize)},
1349 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1350
1351 {CC "defineClass", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass)},
1352 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
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 "putOrderedObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetOrderedObject)},
1358 {CC "putOrderedInt", CC "(" OBJ "JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1359 {CC "putOrderedLong", CC "(" OBJ "JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1360 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)},
1361 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)},
1362
1363 {CC "getLoadAverage", CC "([DI)I", FN_PTR(Unsafe_Loadavg)},
1364
1365 {CC "copyMemory", CC "(" OBJ "J" OBJ "JJ)V", FN_PTR(Unsafe_CopyMemory)},
1366 {CC "setMemory", CC "(" OBJ "JJB)V", FN_PTR(Unsafe_SetMemory)},
1367
1368 {CC "defineAnonymousClass", CC "(" DAC_Args ")" CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1369
1370 {CC "shouldBeInitialized",CC "(" CLS ")Z", FN_PTR(Unsafe_ShouldBeInitialized)},
1371
1372 {CC "loadFence", CC "()V", FN_PTR(Unsafe_LoadFence)},
1373 {CC "storeFence", CC "()V", FN_PTR(Unsafe_StoreFence)},
1374 {CC "fullFence", CC "()V", FN_PTR(Unsafe_FullFence)},
1375 };
1376
1377 static JNINativeMethod jdk_internal_misc_Unsafe_methods[] = {
1378 {CC "getObject", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObject)},
1379 {CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObject)},
1380 {CC "getObjectVolatile",CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObjectVolatile)},
1381 {CC "putObjectVolatile",CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1382
1383 {CC "getUncompressedObject", CC "(" ADR ")" OBJ, FN_PTR(Unsafe_GetUncompressedObject)},
1384 {CC "getJavaMirror", CC "(" ADR ")" CLS, FN_PTR(Unsafe_GetJavaMirror)},
1385 {CC "getKlassPointer", CC "(" OBJ ")" ADR, FN_PTR(Unsafe_GetKlassPointer)},
1386
1387 DECLARE_GETPUTOOP(Boolean, Z),
1388 DECLARE_GETPUTOOP(Byte, B),
1389 DECLARE_GETPUTOOP(Short, S),
1390 DECLARE_GETPUTOOP(Char, C),
1391 DECLARE_GETPUTOOP(Int, I),
1392 DECLARE_GETPUTOOP(Long, J),
1393 DECLARE_GETPUTOOP(Float, F),
1394 DECLARE_GETPUTOOP(Double, D),
1395
1396 DECLARE_GETPUTNATIVE(Byte, B),
1397 DECLARE_GETPUTNATIVE(Short, S),
1398 DECLARE_GETPUTNATIVE(Char, C),
1399 DECLARE_GETPUTNATIVE(Int, I),
1400 DECLARE_GETPUTNATIVE(Long, J),
1401 DECLARE_GETPUTNATIVE(Float, F),
1402 DECLARE_GETPUTNATIVE(Double, D),
1403
1404 {CC "getAddress", CC "(" ADR ")" ADR, FN_PTR(Unsafe_GetNativeAddress)},
1405 {CC "putAddress", CC "(" ADR "" ADR ")V", FN_PTR(Unsafe_SetNativeAddress)},
1406
1407 {CC "allocateMemory", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory)},
1408 {CC "reallocateMemory", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory)},
1409 {CC "freeMemory", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory)},
1410
1411 {CC "objectFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1412 {CC "staticFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset)},
1413 {CC "staticFieldBase", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1414 {CC "ensureClassInitialized",CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1415 {CC "arrayBaseOffset", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1416 {CC "arrayIndexScale", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale)},
1417 {CC "addressSize", CC "()I", FN_PTR(Unsafe_AddressSize)},
1418 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1419
1420 {CC "defineClass", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass)},
1421 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1422 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)},
1423 {CC "compareAndSwapObject", CC "(" OBJ "J" OBJ "" OBJ ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1424 {CC "compareAndSwapInt", CC "(" OBJ "J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1425 {CC "compareAndSwapLong", CC "(" OBJ "J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1426 {CC "compareAndExchangeObjectVolatile", CC "(" OBJ "J" OBJ "" OBJ ")" OBJ, FN_PTR(Unsafe_CompareAndExchangeObject)},
1427 {CC "compareAndExchangeIntVolatile", CC "(" OBJ "J""I""I"")I", FN_PTR(Unsafe_CompareAndExchangeInt)},
1428 {CC "compareAndExchangeLongVolatile", CC "(" OBJ "J""J""J"")J", FN_PTR(Unsafe_CompareAndExchangeLong)},
1429
1430 {CC "putOrderedObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetOrderedObject)},
1431 {CC "putOrderedInt", CC "(" OBJ "JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1432 {CC "putOrderedLong", CC "(" OBJ "JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1433 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)},
1434 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)},
1435
1436 {CC "getLoadAverage", CC "([DI)I", FN_PTR(Unsafe_Loadavg)},
1437
1438 {CC "copyMemory", CC "(" OBJ "J" OBJ "JJ)V", FN_PTR(Unsafe_CopyMemory)},
1439 {CC "copySwapMemory0", CC "(" OBJ "J" OBJ "JJJ)V", FN_PTR(Unsafe_CopySwapMemory0)},
1440 {CC "setMemory", CC "(" OBJ "JJB)V", FN_PTR(Unsafe_SetMemory)},
1441
1442 {CC "defineAnonymousClass", CC "(" DAC_Args ")" CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1443
1444 {CC "shouldBeInitialized",CC "(" CLS ")Z", FN_PTR(Unsafe_ShouldBeInitialized)},
1445
1446 {CC "loadFence", CC "()V", FN_PTR(Unsafe_LoadFence)},
1447 {CC "storeFence", CC "()V", FN_PTR(Unsafe_StoreFence)},
1448 {CC "fullFence", CC "()V", FN_PTR(Unsafe_FullFence)},
1449
1450 {CC "isBigEndian0", CC "()Z", FN_PTR(Unsafe_isBigEndian0)},
1451 {CC "unalignedAccess0", CC "()Z", FN_PTR(Unsafe_unalignedAccess0)}
1452 };
1453
1454 #undef CC
1455 #undef FN_PTR
1456
1457 #undef ADR
1458 #undef LANG
1459 #undef OBJ
1460 #undef CLS
1461 #undef FLD
1462 #undef THR
1463 #undef DC_Args
1464 #undef DAC_Args
1465
1466 #undef DECLARE_GETPUTOOP
1467 #undef DECLARE_GETPUTNATIVE
1468
1469
1470 // These two functions are exported, used by NativeLookup.
1471 // The Unsafe_xxx functions above are called only from the interpreter.
1472 // The optimizer looks at names and signatures to recognize
1473 // individual functions.
1474
1475 JVM_ENTRY(void, JVM_RegisterSunMiscUnsafeMethods(JNIEnv *env, jclass unsafeclass))
1476 UnsafeWrapper("JVM_RegisterSunMiscUnsafeMethods");
1477 {
1478 ThreadToNativeFromVM ttnfv(thread);
1479
1480 int ok = env->RegisterNatives(unsafeclass, sun_misc_Unsafe_methods, sizeof(sun_misc_Unsafe_methods)/sizeof(JNINativeMethod));
1481 guarantee(ok == 0, "register sun.misc.Unsafe natives");
1482 }
1483 JVM_END
1484
1485 JVM_ENTRY(void, JVM_RegisterJDKInternalMiscUnsafeMethods(JNIEnv *env, jclass unsafeclass))
1486 UnsafeWrapper("JVM_RegisterJDKInternalMiscUnsafeMethods");
1487 {
1488 ThreadToNativeFromVM ttnfv(thread);
1489
1490 int ok = env->RegisterNatives(unsafeclass, jdk_internal_misc_Unsafe_methods, sizeof(jdk_internal_misc_Unsafe_methods)/sizeof(JNINativeMethod));
1491 guarantee(ok == 0, "register jdk.internal.misc.Unsafe natives");
1492 }
1493 JVM_END