1 /*
2 * Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/vmSymbols.hpp"
27 #include "memory/allocation.inline.hpp"
28 #include "prims/jni.h"
29 #include "prims/jvm.h"
30 #include "runtime/atomic.inline.hpp"
31 #include "runtime/globals.hpp"
32 #include "runtime/interfaceSupport.hpp"
33 #include "runtime/prefetch.inline.hpp"
34 #include "runtime/orderAccess.inline.hpp"
35 #include "runtime/reflection.hpp"
36 #include "runtime/synchronizer.hpp"
37 #include "runtime/vm_version.hpp"
38 #include "services/threadService.hpp"
39 #include "trace/tracing.hpp"
40 #include "utilities/copy.hpp"
41 #include "utilities/dtrace.hpp"
42 #include "utilities/macros.hpp"
43 #if INCLUDE_ALL_GCS
44 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
45 #endif // INCLUDE_ALL_GCS
46
47 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
48
49 /*
50 * Implementation of class sun.misc.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, err_msg("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 // Macros for oops that check UseCompressedOops
176
177 #define GET_OOP_FIELD(obj, offset, v) \
178 oop p = JNIHandles::resolve(obj); \
179 oop v; \
180 if (UseCompressedOops) { \
181 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
182 v = oopDesc::decode_heap_oop(n); \
183 } else { \
184 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
185 }
186
187
188 // Get/SetObject must be special-cased, since it works with handles.
189
190 // These functions allow a null base pointer with an arbitrary address.
191 // But if the base pointer is non-null, the offset should make some sense.
192 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
193 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
194 UnsafeWrapper("Unsafe_GetObject");
195 GET_OOP_FIELD(obj, offset, v)
196 jobject ret = JNIHandles::make_local(env, v);
197 #if INCLUDE_ALL_GCS
198 // We could be accessing the referent field in a reference
199 // object. If G1 is enabled then we need to register non-null
200 // referent with the SATB barrier.
201 if (UseG1GC) {
202 bool needs_barrier = false;
203
204 if (ret != NULL) {
205 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) {
206 oop o = JNIHandles::resolve(obj);
207 Klass* k = o->klass();
208 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
209 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
210 needs_barrier = true;
211 }
212 }
213 }
214
215 if (needs_barrier) {
216 oop referent = JNIHandles::resolve(ret);
217 G1SATBCardTableModRefBS::enqueue(referent);
218 }
219 }
220 #endif // INCLUDE_ALL_GCS
221 return ret;
222 UNSAFE_END
223
224 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
225 UnsafeWrapper("Unsafe_SetObject");
226 oop x = JNIHandles::resolve(x_h);
227 oop p = JNIHandles::resolve(obj);
228 if (UseCompressedOops) {
229 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
230 } else {
231 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
232 }
233 UNSAFE_END
234
235 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
236 UnsafeWrapper("Unsafe_GetObjectVolatile");
237 oop p = JNIHandles::resolve(obj);
238 void* addr = index_oop_from_field_offset_long(p, offset);
239 volatile oop v;
240 if (UseCompressedOops) {
241 volatile narrowOop n = *(volatile narrowOop*) addr;
242 (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n));
243 } else {
244 (void)const_cast<oop&>(v = *(volatile oop*) addr);
245 }
246 OrderAccess::acquire();
247 return JNIHandles::make_local(env, v);
248 UNSAFE_END
249
250 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
251 UnsafeWrapper("Unsafe_SetObjectVolatile");
252 oop x = JNIHandles::resolve(x_h);
253 oop p = JNIHandles::resolve(obj);
254 void* addr = index_oop_from_field_offset_long(p, offset);
255 OrderAccess::release();
256 if (UseCompressedOops) {
257 oop_store((narrowOop*)addr, x);
258 } else {
259 oop_store((oop*)addr, x);
260 }
261 OrderAccess::fence();
262 UNSAFE_END
263
264 #ifndef SUPPORTS_NATIVE_CX8
265
266 // VM_Version::supports_cx8() is a surrogate for 'supports atomic long memory ops'.
267 //
268 // On platforms which do not support atomic compare-and-swap of jlong (8 byte)
269 // values we have to use a lock-based scheme to enforce atomicity. This has to be
270 // applied to all Unsafe operations that set the value of a jlong field. Even so
271 // the compareAndSwapLong operation will not be atomic with respect to direct stores
272 // to the field from Java code. It is important therefore that any Java code that
273 // utilizes these Unsafe jlong operations does not perform direct stores. To permit
274 // direct loads of the field from Java code we must also use Atomic::store within the
275 // locked regions. And for good measure, in case there are direct stores, we also
276 // employ Atomic::load within those regions. Note that the field in question must be
277 // volatile and so must have atomic load/store accesses applied at the Java level.
278 //
279 // The locking scheme could utilize a range of strategies for controlling the locking
280 // granularity: from a lock per-field through to a single global lock. The latter is
281 // the simplest and is used for the current implementation. Note that the Java object
282 // that contains the field, can not, in general, be used for locking. To do so can lead
283 // to deadlocks as we may introduce locking into what appears to the Java code to be a
284 // lock-free path.
285 //
286 // As all the locked-regions are very short and themselves non-blocking we can treat
287 // them as leaf routines and elide safepoint checks (ie we don't perform any thread
288 // state transitions even when blocking for the lock). Note that if we do choose to
289 // add safepoint checks and thread state transitions, we must ensure that we calculate
290 // the address of the field _after_ we have acquired the lock, else the object may have
291 // been moved by the GC
292
293 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
294 UnsafeWrapper("Unsafe_GetLongVolatile");
295 {
296 if (VM_Version::supports_cx8()) {
297 GET_FIELD_VOLATILE(obj, offset, jlong, v);
298 return v;
299 }
300 else {
301 Handle p (THREAD, JNIHandles::resolve(obj));
302 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
303 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
304 jlong value = Atomic::load(addr);
305 return value;
306 }
307 }
308 UNSAFE_END
309
310 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
311 UnsafeWrapper("Unsafe_SetLongVolatile");
312 {
313 if (VM_Version::supports_cx8()) {
314 SET_FIELD_VOLATILE(obj, offset, jlong, x);
315 }
316 else {
317 Handle p (THREAD, JNIHandles::resolve(obj));
318 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
319 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
320 Atomic::store(x, addr);
321 }
322 }
323 UNSAFE_END
324
325 #endif // not SUPPORTS_NATIVE_CX8
326
327 #define DEFINE_GETSETOOP(jboolean, Boolean) \
328 \
329 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
330 UnsafeWrapper("Unsafe_Get"#Boolean); \
331 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
332 GET_FIELD(obj, offset, jboolean, v); \
333 return v; \
334 UNSAFE_END \
335 \
336 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
337 UnsafeWrapper("Unsafe_Set"#Boolean); \
338 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
339 SET_FIELD(obj, offset, jboolean, x); \
340 UNSAFE_END \
341 \
342 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
343 UnsafeWrapper("Unsafe_Get"#Boolean); \
344 GET_FIELD(obj, offset, jboolean, v); \
345 return v; \
346 UNSAFE_END \
347 \
348 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
349 UnsafeWrapper("Unsafe_Set"#Boolean); \
350 SET_FIELD(obj, offset, jboolean, x); \
351 UNSAFE_END \
352 \
353 // END DEFINE_GETSETOOP.
354
355 DEFINE_GETSETOOP(jboolean, Boolean)
356 DEFINE_GETSETOOP(jbyte, Byte)
357 DEFINE_GETSETOOP(jshort, Short);
358 DEFINE_GETSETOOP(jchar, Char);
359 DEFINE_GETSETOOP(jint, Int);
360 DEFINE_GETSETOOP(jlong, Long);
361 DEFINE_GETSETOOP(jfloat, Float);
362 DEFINE_GETSETOOP(jdouble, Double);
363
364 #undef DEFINE_GETSETOOP
365
366 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
367 \
368 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
369 UnsafeWrapper("Unsafe_Get"#Boolean); \
370 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
371 return v; \
372 UNSAFE_END \
373 \
374 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
375 UnsafeWrapper("Unsafe_Set"#Boolean); \
376 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
377 UNSAFE_END \
378 \
379 // END DEFINE_GETSETOOP_VOLATILE.
380
381 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
382 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
383 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
384 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
385 DEFINE_GETSETOOP_VOLATILE(jint, Int);
386 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
387 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
388
389 #ifdef SUPPORTS_NATIVE_CX8
390 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
391 #endif
392
393 #undef DEFINE_GETSETOOP_VOLATILE
394
395 // The non-intrinsified versions of setOrdered just use setVolatile
396
397 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
398 UnsafeWrapper("Unsafe_SetOrderedInt");
399 SET_FIELD_VOLATILE(obj, offset, jint, x);
400 UNSAFE_END
401
402 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
403 UnsafeWrapper("Unsafe_SetOrderedObject");
404 oop x = JNIHandles::resolve(x_h);
405 oop p = JNIHandles::resolve(obj);
406 void* addr = index_oop_from_field_offset_long(p, offset);
407 OrderAccess::release();
408 if (UseCompressedOops) {
409 oop_store((narrowOop*)addr, x);
410 } else {
411 oop_store((oop*)addr, x);
412 }
413 OrderAccess::fence();
414 UNSAFE_END
415
416 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
417 UnsafeWrapper("Unsafe_SetOrderedLong");
418 #ifdef SUPPORTS_NATIVE_CX8
419 SET_FIELD_VOLATILE(obj, offset, jlong, x);
420 #else
421 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
422 {
423 if (VM_Version::supports_cx8()) {
424 SET_FIELD_VOLATILE(obj, offset, jlong, x);
425 }
426 else {
427 Handle p (THREAD, JNIHandles::resolve(obj));
428 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
429 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
430 Atomic::store(x, addr);
431 }
432 }
433 #endif
434 UNSAFE_END
435
436 UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe))
437 UnsafeWrapper("Unsafe_LoadFence");
438 OrderAccess::acquire();
439 UNSAFE_END
440
441 UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe))
442 UnsafeWrapper("Unsafe_StoreFence");
443 OrderAccess::release();
444 UNSAFE_END
445
446 UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe))
447 UnsafeWrapper("Unsafe_FullFence");
448 OrderAccess::fence();
449 UNSAFE_END
450
451 ////// Data in the C heap.
452
453 // Note: These do not throw NullPointerException for bad pointers.
454 // They just crash. Only a oop base pointer can generate a NullPointerException.
455 //
456 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
457 \
458 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
459 UnsafeWrapper("Unsafe_GetNative"#Type); \
460 void* p = addr_from_java(addr); \
461 JavaThread* t = JavaThread::current(); \
462 t->set_doing_unsafe_access(true); \
463 java_type x = *(volatile native_type*)p; \
464 t->set_doing_unsafe_access(false); \
465 return x; \
466 UNSAFE_END \
467 \
468 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
469 UnsafeWrapper("Unsafe_SetNative"#Type); \
470 JavaThread* t = JavaThread::current(); \
471 t->set_doing_unsafe_access(true); \
472 void* p = addr_from_java(addr); \
473 *(volatile native_type*)p = x; \
474 t->set_doing_unsafe_access(false); \
475 UNSAFE_END \
476 \
477 // END DEFINE_GETSETNATIVE.
478
479 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
480 DEFINE_GETSETNATIVE(jshort, Short, signed short);
481 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
482 DEFINE_GETSETNATIVE(jint, Int, jint);
483 // no long -- handled specially
484 DEFINE_GETSETNATIVE(jfloat, Float, float);
485 DEFINE_GETSETNATIVE(jdouble, Double, double);
486
487 #undef DEFINE_GETSETNATIVE
488
489 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
490 UnsafeWrapper("Unsafe_GetNativeLong");
491 JavaThread* t = JavaThread::current();
492 // We do it this way to avoid problems with access to heap using 64
493 // bit loads, as jlong in heap could be not 64-bit aligned, and on
494 // some CPUs (SPARC) it leads to SIGBUS.
495 t->set_doing_unsafe_access(true);
496 void* p = addr_from_java(addr);
497 jlong x;
498 if (((intptr_t)p & 7) == 0) {
499 // jlong is aligned, do a volatile access
500 x = *(volatile jlong*)p;
501 } else {
502 jlong_accessor acc;
503 acc.words[0] = ((volatile jint*)p)[0];
504 acc.words[1] = ((volatile jint*)p)[1];
505 x = acc.long_value;
506 }
507 t->set_doing_unsafe_access(false);
508 return x;
509 UNSAFE_END
510
511 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
512 UnsafeWrapper("Unsafe_SetNativeLong");
513 JavaThread* t = JavaThread::current();
514 // see comment for Unsafe_GetNativeLong
515 t->set_doing_unsafe_access(true);
516 void* p = addr_from_java(addr);
517 if (((intptr_t)p & 7) == 0) {
518 // jlong is aligned, do a volatile access
519 *(volatile jlong*)p = x;
520 } else {
521 jlong_accessor acc;
522 acc.long_value = x;
523 ((volatile jint*)p)[0] = acc.words[0];
524 ((volatile jint*)p)[1] = acc.words[1];
525 }
526 t->set_doing_unsafe_access(false);
527 UNSAFE_END
528
529
530 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
531 UnsafeWrapper("Unsafe_GetNativeAddress");
532 void* p = addr_from_java(addr);
533 return addr_to_java(*(void**)p);
534 UNSAFE_END
535
536 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
537 UnsafeWrapper("Unsafe_SetNativeAddress");
538 void* p = addr_from_java(addr);
539 *(void**)p = addr_from_java(x);
540 UNSAFE_END
541
542
543 ////// Allocation requests
544
545 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
546 UnsafeWrapper("Unsafe_AllocateInstance");
547 {
548 ThreadToNativeFromVM ttnfv(thread);
549 return env->AllocObject(cls);
550 }
551 UNSAFE_END
552
553 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
554 UnsafeWrapper("Unsafe_AllocateMemory");
555 size_t sz = (size_t)size;
556 if (sz != (julong)size || size < 0) {
557 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
558 }
559 if (sz == 0) {
560 return 0;
561 }
562 sz = round_to(sz, HeapWordSize);
563 void* x = os::malloc(sz, mtInternal);
564 if (x == NULL) {
565 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
566 }
567 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
568 return addr_to_java(x);
569 UNSAFE_END
570
571 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
572 UnsafeWrapper("Unsafe_ReallocateMemory");
573 void* p = addr_from_java(addr);
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 os::free(p);
580 return 0;
581 }
582 sz = round_to(sz, HeapWordSize);
583 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal);
584 if (x == NULL) {
585 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
586 }
587 return addr_to_java(x);
588 UNSAFE_END
589
590 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
591 UnsafeWrapper("Unsafe_FreeMemory");
592 void* p = addr_from_java(addr);
593 if (p == NULL) {
594 return;
595 }
596 os::free(p);
597 UNSAFE_END
598
599 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
600 UnsafeWrapper("Unsafe_SetMemory");
601 size_t sz = (size_t)size;
602 if (sz != (julong)size || size < 0) {
603 THROW(vmSymbols::java_lang_IllegalArgumentException());
604 }
605 char* p = (char*) addr_from_java(addr);
606 Copy::fill_to_memory_atomic(p, sz, value);
607 UNSAFE_END
608
609 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
610 UnsafeWrapper("Unsafe_SetMemory");
611 size_t sz = (size_t)size;
612 if (sz != (julong)size || size < 0) {
613 THROW(vmSymbols::java_lang_IllegalArgumentException());
614 }
615 oop base = JNIHandles::resolve(obj);
616 void* p = index_oop_from_field_offset_long(base, offset);
617 Copy::fill_to_memory_atomic(p, sz, value);
618 UNSAFE_END
619
620 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
621 UnsafeWrapper("Unsafe_CopyMemory");
622 if (size == 0) {
623 return;
624 }
625 size_t sz = (size_t)size;
626 if (sz != (julong)size || size < 0) {
627 THROW(vmSymbols::java_lang_IllegalArgumentException());
628 }
629 void* src = addr_from_java(srcAddr);
630 void* dst = addr_from_java(dstAddr);
631 Copy::conjoint_memory_atomic(src, dst, sz);
632 UNSAFE_END
633
634 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
635 UnsafeWrapper("Unsafe_CopyMemory");
636 if (size == 0) {
637 return;
638 }
639 size_t sz = (size_t)size;
640 if (sz != (julong)size || size < 0) {
641 THROW(vmSymbols::java_lang_IllegalArgumentException());
642 }
643 oop srcp = JNIHandles::resolve(srcObj);
644 oop dstp = JNIHandles::resolve(dstObj);
645 if (dstp != NULL && !dstp->is_typeArray()) {
646 // NYI: This works only for non-oop arrays at present.
647 // Generalizing it would be reasonable, but requires card marking.
648 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
649 THROW(vmSymbols::java_lang_IllegalArgumentException());
650 }
651 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
652 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
653 Copy::conjoint_memory_atomic(src, dst, sz);
654 UNSAFE_END
655
656
657 ////// Random queries
658
659 // See comment at file start about UNSAFE_LEAF
660 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
661 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
662 UnsafeWrapper("Unsafe_AddressSize");
663 return sizeof(void*);
664 UNSAFE_END
665
666 // See comment at file start about UNSAFE_LEAF
667 //UNSAFE_LEAF(jint, Unsafe_PageSize())
668 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
669 UnsafeWrapper("Unsafe_PageSize");
670 return os::vm_page_size();
671 UNSAFE_END
672
673 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
674 if (field == NULL) {
675 THROW_0(vmSymbols::java_lang_NullPointerException());
676 }
677
678 oop reflected = JNIHandles::resolve_non_null(field);
679 oop mirror = java_lang_reflect_Field::clazz(reflected);
680 Klass* k = java_lang_Class::as_Klass(mirror);
681 int slot = java_lang_reflect_Field::slot(reflected);
682 int modifiers = java_lang_reflect_Field::modifiers(reflected);
683
684 if (must_be_static >= 0) {
685 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
686 if (must_be_static != really_is_static) {
687 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
688 }
689 }
690
691 int offset = InstanceKlass::cast(k)->field_offset(slot);
692 return field_offset_from_byte_offset(offset);
693 }
694
695 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
696 UnsafeWrapper("Unsafe_ObjectFieldOffset");
697 return find_field_offset(field, 0, THREAD);
698 UNSAFE_END
699
700 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
701 UnsafeWrapper("Unsafe_StaticFieldOffset");
702 return find_field_offset(field, 1, THREAD);
703 UNSAFE_END
704
705 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
706 UnsafeWrapper("Unsafe_StaticFieldBase");
707 // Note: In this VM implementation, a field address is always a short
708 // offset from the base of a a klass metaobject. Thus, the full dynamic
709 // range of the return type is never used. However, some implementations
710 // might put the static field inside an array shared by many classes,
711 // or even at a fixed address, in which case the address could be quite
712 // large. In that last case, this function would return NULL, since
713 // the address would operate alone, without any base pointer.
714
715 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
716
717 oop reflected = JNIHandles::resolve_non_null(field);
718 oop mirror = java_lang_reflect_Field::clazz(reflected);
719 int modifiers = java_lang_reflect_Field::modifiers(reflected);
720
721 if ((modifiers & JVM_ACC_STATIC) == 0) {
722 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
723 }
724
725 return JNIHandles::make_local(env, mirror);
726 UNSAFE_END
727
728 //@deprecated
729 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
730 UnsafeWrapper("Unsafe_FieldOffset");
731 // tries (but fails) to be polymorphic between static and non-static:
732 jlong offset = find_field_offset(field, -1, THREAD);
733 guarantee(offset == (jint)offset, "offset fits in 32 bits");
734 return (jint)offset;
735 UNSAFE_END
736
737 //@deprecated
738 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
739 UnsafeWrapper("Unsafe_StaticFieldBase");
740 if (clazz == NULL) {
741 THROW_0(vmSymbols::java_lang_NullPointerException());
742 }
743 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
744 UNSAFE_END
745
746 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
747 UnsafeWrapper("Unsafe_EnsureClassInitialized");
748 if (clazz == NULL) {
749 THROW(vmSymbols::java_lang_NullPointerException());
750 }
751 oop mirror = JNIHandles::resolve_non_null(clazz);
752
753 Klass* klass = java_lang_Class::as_Klass(mirror);
754 if (klass != NULL && klass->should_be_initialized()) {
755 InstanceKlass* k = InstanceKlass::cast(klass);
756 k->initialize(CHECK);
757 }
758 }
759 UNSAFE_END
760
761 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
762 UnsafeWrapper("Unsafe_ShouldBeInitialized");
763 if (clazz == NULL) {
764 THROW_(vmSymbols::java_lang_NullPointerException(), false);
765 }
766 oop mirror = JNIHandles::resolve_non_null(clazz);
767 Klass* klass = java_lang_Class::as_Klass(mirror);
768 if (klass != NULL && klass->should_be_initialized()) {
769 return true;
770 }
771 return false;
772 }
773 UNSAFE_END
774
775 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
776 if (acls == NULL) {
777 THROW(vmSymbols::java_lang_NullPointerException());
778 }
779 oop mirror = JNIHandles::resolve_non_null(acls);
780 Klass* k = java_lang_Class::as_Klass(mirror);
781 if (k == NULL || !k->oop_is_array()) {
782 THROW(vmSymbols::java_lang_InvalidClassException());
783 } else if (k->oop_is_objArray()) {
784 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
785 scale = heapOopSize;
786 } else if (k->oop_is_typeArray()) {
787 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
788 base = tak->array_header_in_bytes();
789 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
790 scale = (1 << tak->log2_element_size());
791 } else {
792 ShouldNotReachHere();
793 }
794 }
795
796 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
797 UnsafeWrapper("Unsafe_ArrayBaseOffset");
798 int base, scale;
799 getBaseAndScale(base, scale, acls, CHECK_0);
800 return field_offset_from_byte_offset(base);
801 UNSAFE_END
802
803
804 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
805 UnsafeWrapper("Unsafe_ArrayIndexScale");
806 int base, scale;
807 getBaseAndScale(base, scale, acls, CHECK_0);
808 // This VM packs both fields and array elements down to the byte.
809 // But watch out: If this changes, so that array references for
810 // a given primitive type (say, T_BOOLEAN) use different memory units
811 // than fields, this method MUST return zero for such arrays.
812 // For example, the VM used to store sub-word sized fields in full
813 // words in the object layout, so that accessors like getByte(Object,int)
814 // did not really do what one might expect for arrays. Therefore,
815 // this function used to report a zero scale factor, so that the user
816 // would know not to attempt to access sub-word array elements.
817 // // Code for unpacked fields:
818 // if (scale < wordSize) return 0;
819
820 // The following allows for a pretty general fieldOffset cookie scheme,
821 // but requires it to be linear in byte offset.
822 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
823 UNSAFE_END
824
825
826 static inline void throw_new(JNIEnv *env, const char *ename) {
827 char buf[100];
828 jio_snprintf(buf, 100, "%s%s", "java/lang/", ename);
829 jclass cls = env->FindClass(buf);
830 if (env->ExceptionCheck()) {
831 env->ExceptionClear();
832 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf);
833 return;
834 }
835 char* msg = NULL;
836 env->ThrowNew(cls, msg);
837 }
838
839 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
840 {
841 // Code lifted from JDK 1.3 ClassLoader.c
842
843 jbyte *body;
844 char *utfName;
845 jclass result = 0;
846 char buf[128];
847
848 if (UsePerfData) {
849 ClassLoader::unsafe_defineClassCallCounter()->inc();
850 }
851
852 if (data == NULL) {
853 throw_new(env, "NullPointerException");
854 return 0;
855 }
856
857 /* Work around 4153825. malloc crashes on Solaris when passed a
858 * negative size.
859 */
860 if (length < 0) {
861 throw_new(env, "ArrayIndexOutOfBoundsException");
862 return 0;
863 }
864
865 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
866
867 if (body == 0) {
868 throw_new(env, "OutOfMemoryError");
869 return 0;
870 }
871
872 env->GetByteArrayRegion(data, offset, length, body);
873
874 if (env->ExceptionOccurred())
875 goto free_body;
876
877 if (name != NULL) {
878 uint len = env->GetStringUTFLength(name);
879 int unicode_len = env->GetStringLength(name);
880 if (len >= sizeof(buf)) {
881 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
882 if (utfName == NULL) {
883 throw_new(env, "OutOfMemoryError");
884 goto free_body;
885 }
886 } else {
887 utfName = buf;
888 }
889 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
890 //VerifyFixClassname(utfName);
891 for (uint i = 0; i < len; i++) {
892 if (utfName[i] == '.') utfName[i] = '/';
893 }
894 } else {
895 utfName = NULL;
896 }
897
898 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
899
900 if (utfName && utfName != buf)
901 FREE_C_HEAP_ARRAY(char, utfName);
902
903 free_body:
904 FREE_C_HEAP_ARRAY(jbyte, body);
905 return result;
906 }
907 }
908
909
910 UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
911 UnsafeWrapper("Unsafe_DefineClass");
912 {
913 ThreadToNativeFromVM ttnfv(thread);
914 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
915 }
916 UNSAFE_END
917
918 static jobject get_class_loader(JNIEnv* env, jclass cls) {
919 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
920 return NULL;
921 }
922 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
923 oop loader = k->class_loader();
924 return JNIHandles::make_local(env, loader);
925 }
926
927 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
928 UnsafeWrapper("Unsafe_DefineClass");
929 {
930 ThreadToNativeFromVM ttnfv(thread);
931
932 int depthFromDefineClass0 = 1;
933 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
934 jobject loader = (caller == NULL) ? NULL : get_class_loader(env, caller);
935 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
936
937 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
938 }
939 UNSAFE_END
940
941
942 #define DAC_Args CLS"[B["OBJ
943 // define a class but do not make it known to the class loader or system dictionary
944 // - host_class: supplies context for linkage, access control, protection domain, and class loader
945 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
946 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
947
948 // When you load an anonymous class U, it works as if you changed its name just before loading,
949 // to a name that you will never use again. Since the name is lost, no other class can directly
950 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
951 // through java.lang.Class methods like Class.newInstance.
952
953 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
954 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
955 // An anonymous class also has special privileges to access any member of its host class.
956 // This is the main reason why this loading operation is unsafe. The purpose of this is to
957 // allow language implementations to simulate "open classes"; a host class in effect gets
958 // new code when an anonymous class is loaded alongside it. A less convenient but more
959 // standard way to do this is with reflection, which can also be set to ignore access
960 // restrictions.
961
962 // Access into an anonymous class is possible only through reflection. Therefore, there
963 // are no special access rules for calling into an anonymous class. The relaxed access
964 // rule for the host class is applied in the opposite direction: A host class reflectively
965 // access one of its anonymous classes.
966
967 // If you load the same bytecodes twice, you get two different classes. You can reload
968 // the same bytecodes with or without varying CP patches.
969
970 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
971 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
972 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
973
974 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
975 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
976 // It is not possible for a named class, or an older anonymous class, to refer by
977 // name (via its CP) to a newer anonymous class.
978
979 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
980 // or type descriptors used in the loaded anonymous class.
981
982 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
983 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
984 // be changed to println(greeting), where greeting is an arbitrary object created before
985 // the anonymous class is loaded. This is useful in dynamic languages, in which
986 // various kinds of metaobjects must be introduced as constants into bytecode.
987 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
988 // not just a literal string. For such ldc instructions, the verifier uses the
989 // type Object instead of String, if the loaded constant is not in fact a String.
990
991 static instanceKlassHandle
992 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
993 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
994 HeapWord* *temp_alloc,
995 TRAPS) {
996
997 if (UsePerfData) {
998 ClassLoader::unsafe_defineClassCallCounter()->inc();
999 }
1000
1001 if (data == NULL) {
1002 THROW_0(vmSymbols::java_lang_NullPointerException());
1003 }
1004
1005 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
1006 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
1007 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal);
1008 if (body == NULL) {
1009 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1010 }
1011
1012 // caller responsible to free it:
1013 (*temp_alloc) = body;
1014
1015 {
1016 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1017 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1018 }
1019
1020 u1* class_bytes = (u1*) body;
1021 int class_bytes_length = (int) length;
1022 if (class_bytes_length < 0) class_bytes_length = 0;
1023 if (class_bytes == NULL
1024 || host_class == NULL
1025 || length != class_bytes_length)
1026 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1027
1028 objArrayHandle cp_patches_h;
1029 if (cp_patches_jh != NULL) {
1030 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1031 if (!p->is_objArray())
1032 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1033 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1034 }
1035
1036 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class)));
1037 const char* host_source = host_klass->external_name();
1038 Handle host_loader(THREAD, host_klass->class_loader());
1039 Handle host_domain(THREAD, host_klass->protection_domain());
1040
1041 GrowableArray<Handle>* cp_patches = NULL;
1042 if (cp_patches_h.not_null()) {
1043 int alen = cp_patches_h->length();
1044 for (int i = alen-1; i >= 0; i--) {
1045 oop p = cp_patches_h->obj_at(i);
1046 if (p != NULL) {
1047 Handle patch(THREAD, p);
1048 if (cp_patches == NULL)
1049 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1050 cp_patches->at_put(i, patch);
1051 }
1052 }
1053 }
1054
1055 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1056
1057 instanceKlassHandle anon_klass;
1058 {
1059 Symbol* no_class_name = NULL;
1060 Klass* anonk = SystemDictionary::parse_stream(no_class_name,
1061 host_loader, host_domain,
1062 &st, host_klass, cp_patches,
1063 CHECK_NULL);
1064 if (anonk == NULL) return NULL;
1065 anon_klass = instanceKlassHandle(THREAD, anonk);
1066 }
1067
1068 return anon_klass;
1069 }
1070
1071 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1072 {
1073 instanceKlassHandle anon_klass;
1074 jobject res_jh = NULL;
1075
1076 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1077 ResourceMark rm(THREAD);
1078
1079 HeapWord* temp_alloc = NULL;
1080
1081 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data,
1082 cp_patches_jh,
1083 &temp_alloc, THREAD);
1084 if (anon_klass() != NULL)
1085 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
1086
1087 // try/finally clause:
1088 if (temp_alloc != NULL) {
1089 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc);
1090 }
1091
1092 // The anonymous class loader data has been artificially been kept alive to
1093 // this point. The mirror and any instances of this class have to keep
1094 // it alive afterwards.
1095 if (anon_klass() != NULL) {
1096 anon_klass->class_loader_data()->set_keep_alive(false);
1097 }
1098
1099 // let caller initialize it as needed...
1100
1101 return (jclass) res_jh;
1102 }
1103 UNSAFE_END
1104
1105
1106
1107 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1108 UnsafeWrapper("Unsafe_ThrowException");
1109 {
1110 ThreadToNativeFromVM ttnfv(thread);
1111 env->Throw(thr);
1112 }
1113 UNSAFE_END
1114
1115 // JSR166 ------------------------------------------------------------------
1116
1117 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1118 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1119 oop x = JNIHandles::resolve(x_h);
1120 oop e = JNIHandles::resolve(e_h);
1121 oop p = JNIHandles::resolve(obj);
1122 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1123 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
1124 jboolean success = (res == e);
1125 if (success)
1126 update_barrier_set((void*)addr, x);
1127 return success;
1128 UNSAFE_END
1129
1130 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1131 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1132 oop p = JNIHandles::resolve(obj);
1133 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1134 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1135 UNSAFE_END
1136
1137 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1138 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1139 Handle p (THREAD, JNIHandles::resolve(obj));
1140 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1141 #ifdef SUPPORTS_NATIVE_CX8
1142 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1143 #else
1144 if (VM_Version::supports_cx8())
1145 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1146 else {
1147 jboolean success = false;
1148 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
1149 jlong val = Atomic::load(addr);
1150 if (val == e) { Atomic::store(x, addr); success = true; }
1151 return success;
1152 }
1153 #endif
1154 UNSAFE_END
1155
1156 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1157 UnsafeWrapper("Unsafe_Park");
1158 EventThreadPark event;
1159 HOTSPOT_THREAD_PARK_BEGIN((uintptr_t) thread->parker(), (int) isAbsolute, time);
1160
1161 JavaThreadParkedState jtps(thread, time != 0);
1162 thread->parker()->park(isAbsolute != 0, time);
1163
1164 HOTSPOT_THREAD_PARK_END((uintptr_t) thread->parker());
1165 if (event.should_commit()) {
1166 oop obj = thread->current_park_blocker();
1167 event.set_klass((obj != NULL) ? obj->klass() : NULL);
1168 event.set_timeout(time);
1169 event.set_address((obj != NULL) ? (TYPE_ADDRESS) cast_from_oop<uintptr_t>(obj) : 0);
1170 event.commit();
1171 }
1172 UNSAFE_END
1173
1174 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1175 UnsafeWrapper("Unsafe_Unpark");
1176 Parker* p = NULL;
1177 if (jthread != NULL) {
1178 oop java_thread = JNIHandles::resolve_non_null(jthread);
1179 if (java_thread != NULL) {
1180 jlong lp = java_lang_Thread::park_event(java_thread);
1181 if (lp != 0) {
1182 // This cast is OK even though the jlong might have been read
1183 // non-atomically on 32bit systems, since there, one word will
1184 // always be zero anyway and the value set is always the same
1185 p = (Parker*)addr_from_java(lp);
1186 } else {
1187 // Grab lock if apparently null or using older version of library
1188 MutexLocker mu(Threads_lock);
1189 java_thread = JNIHandles::resolve_non_null(jthread);
1190 if (java_thread != NULL) {
1191 JavaThread* thr = java_lang_Thread::thread(java_thread);
1192 if (thr != NULL) {
1193 p = thr->parker();
1194 if (p != NULL) { // Bind to Java thread for next time.
1195 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1196 }
1197 }
1198 }
1199 }
1200 }
1201 }
1202 if (p != NULL) {
1203 HOTSPOT_THREAD_UNPARK((uintptr_t) p);
1204 p->unpark();
1205 }
1206 UNSAFE_END
1207
1208 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1209 UnsafeWrapper("Unsafe_Loadavg");
1210 const int max_nelem = 3;
1211 double la[max_nelem];
1212 jint ret;
1213
1214 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1215 assert(a->is_typeArray(), "must be type array");
1216
1217 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1218 ThreadToNativeFromVM ttnfv(thread);
1219 throw_new(env, "ArrayIndexOutOfBoundsException");
1220 return -1;
1221 }
1222
1223 ret = os::loadavg(la, nelem);
1224 if (ret == -1) return -1;
1225
1226 // if successful, ret is the number of samples actually retrieved.
1227 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1228 switch(ret) {
1229 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1230 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1231 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1232 }
1233 return ret;
1234 UNSAFE_END
1235
1236 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1237 UnsafeWrapper("Unsafe_PrefetchRead");
1238 oop p = JNIHandles::resolve(obj);
1239 void* addr = index_oop_from_field_offset_long(p, 0);
1240 Prefetch::read(addr, (intx)offset);
1241 UNSAFE_END
1242
1243 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1244 UnsafeWrapper("Unsafe_PrefetchWrite");
1245 oop p = JNIHandles::resolve(obj);
1246 void* addr = index_oop_from_field_offset_long(p, 0);
1247 Prefetch::write(addr, (intx)offset);
1248 UNSAFE_END
1249
1250
1251 /// JVM_RegisterUnsafeMethods
1252
1253 #define ADR "J"
1254
1255 #define LANG "Ljava/lang/"
1256
1257 #define OBJ LANG"Object;"
1258 #define CLS LANG"Class;"
1259 #define CTR LANG"reflect/Constructor;"
1260 #define FLD LANG"reflect/Field;"
1261 #define MTH LANG"reflect/Method;"
1262 #define THR LANG"Throwable;"
1263
1264 #define DC0_Args LANG"String;[BII"
1265 #define DC_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1266
1267 #define CC (char*) /*cast a literal from (const char*)*/
1268 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1269
1270 // define deprecated accessors for compabitility with 1.4.0
1271 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1272 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1273 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1274
1275 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1276 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1277 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1278 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1279
1280 // Note: In 1.5.0, there are volatile versions too
1281 #define DECLARE_GETSETOOP(Boolean, Z) \
1282 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1283 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1284 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1285 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1286
1287
1288 #define DECLARE_GETSETNATIVE(Byte, B) \
1289 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1290 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1291
1292
1293
1294 // These are the methods for 1.4.0
1295 static JNINativeMethod methods_140[] = {
1296 DECLARE_GETSETOOP_140(Boolean, Z),
1297 DECLARE_GETSETOOP_140(Byte, B),
1298 DECLARE_GETSETOOP_140(Short, S),
1299 DECLARE_GETSETOOP_140(Char, C),
1300 DECLARE_GETSETOOP_140(Int, I),
1301 DECLARE_GETSETOOP_140(Long, J),
1302 DECLARE_GETSETOOP_140(Float, F),
1303 DECLARE_GETSETOOP_140(Double, D),
1304
1305 DECLARE_GETSETNATIVE(Byte, B),
1306 DECLARE_GETSETNATIVE(Short, S),
1307 DECLARE_GETSETNATIVE(Char, C),
1308 DECLARE_GETSETNATIVE(Int, I),
1309 DECLARE_GETSETNATIVE(Long, J),
1310 DECLARE_GETSETNATIVE(Float, F),
1311 DECLARE_GETSETNATIVE(Double, D),
1312
1313 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1314 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1315
1316 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1317 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1318 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1319
1320 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)},
1321 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)},
1322 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1323 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1324 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1325 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1326 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1327
1328 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1329 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1330 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1331 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1332 };
1333
1334 // These are the methods prior to the JSR 166 changes in 1.5.0
1335 static JNINativeMethod methods_141[] = {
1336 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1337 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1338
1339 DECLARE_GETSETOOP_141(Boolean, Z),
1340 DECLARE_GETSETOOP_141(Byte, B),
1341 DECLARE_GETSETOOP_141(Short, S),
1342 DECLARE_GETSETOOP_141(Char, C),
1343 DECLARE_GETSETOOP_141(Int, I),
1344 DECLARE_GETSETOOP_141(Long, J),
1345 DECLARE_GETSETOOP_141(Float, F),
1346 DECLARE_GETSETOOP_141(Double, D),
1347
1348 DECLARE_GETSETNATIVE(Byte, B),
1349 DECLARE_GETSETNATIVE(Short, S),
1350 DECLARE_GETSETNATIVE(Char, C),
1351 DECLARE_GETSETNATIVE(Int, I),
1352 DECLARE_GETSETNATIVE(Long, J),
1353 DECLARE_GETSETNATIVE(Float, F),
1354 DECLARE_GETSETNATIVE(Double, D),
1355
1356 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1357 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1358
1359 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1360 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1361 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1362
1363 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1364 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1365 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1366 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1367 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1368 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1369 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1370 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1371
1372 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1373 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1374 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1375 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1376
1377 };
1378
1379 // These are the methods prior to the JSR 166 changes in 1.6.0
1380 static JNINativeMethod methods_15[] = {
1381 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1382 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1383 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1384 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1385
1386
1387 DECLARE_GETSETOOP(Boolean, Z),
1388 DECLARE_GETSETOOP(Byte, B),
1389 DECLARE_GETSETOOP(Short, S),
1390 DECLARE_GETSETOOP(Char, C),
1391 DECLARE_GETSETOOP(Int, I),
1392 DECLARE_GETSETOOP(Long, J),
1393 DECLARE_GETSETOOP(Float, F),
1394 DECLARE_GETSETOOP(Double, D),
1395
1396 DECLARE_GETSETNATIVE(Byte, B),
1397 DECLARE_GETSETNATIVE(Short, S),
1398 DECLARE_GETSETNATIVE(Char, C),
1399 DECLARE_GETSETNATIVE(Int, I),
1400 DECLARE_GETSETNATIVE(Long, J),
1401 DECLARE_GETSETNATIVE(Float, F),
1402 DECLARE_GETSETNATIVE(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"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1421 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1422 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1423 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1424 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1425 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1426 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1427 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1428 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1429
1430 };
1431
1432 // These are the methods for 1.6.0 and 1.7.0
1433 static JNINativeMethod methods_16[] = {
1434 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1435 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1436 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1437 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1438
1439 DECLARE_GETSETOOP(Boolean, Z),
1440 DECLARE_GETSETOOP(Byte, B),
1441 DECLARE_GETSETOOP(Short, S),
1442 DECLARE_GETSETOOP(Char, C),
1443 DECLARE_GETSETOOP(Int, I),
1444 DECLARE_GETSETOOP(Long, J),
1445 DECLARE_GETSETOOP(Float, F),
1446 DECLARE_GETSETOOP(Double, D),
1447
1448 DECLARE_GETSETNATIVE(Byte, B),
1449 DECLARE_GETSETNATIVE(Short, S),
1450 DECLARE_GETSETNATIVE(Char, C),
1451 DECLARE_GETSETNATIVE(Int, I),
1452 DECLARE_GETSETNATIVE(Long, J),
1453 DECLARE_GETSETNATIVE(Float, F),
1454 DECLARE_GETSETNATIVE(Double, D),
1455
1456 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1457 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1458
1459 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1460 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1461 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1462
1463 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1464 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1465 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1466 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1467 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1468 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1469 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1470 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1471
1472 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1473 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1474 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1475 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1476 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1477 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1478 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1479 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1480 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1481 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1482 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1483 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1484 };
1485
1486 // These are the methods for 1.8.0
1487 static JNINativeMethod methods_18[] = {
1488 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1489 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1490 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1491 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1492
1493 DECLARE_GETSETOOP(Boolean, Z),
1494 DECLARE_GETSETOOP(Byte, B),
1495 DECLARE_GETSETOOP(Short, S),
1496 DECLARE_GETSETOOP(Char, C),
1497 DECLARE_GETSETOOP(Int, I),
1498 DECLARE_GETSETOOP(Long, J),
1499 DECLARE_GETSETOOP(Float, F),
1500 DECLARE_GETSETOOP(Double, D),
1501
1502 DECLARE_GETSETNATIVE(Byte, B),
1503 DECLARE_GETSETNATIVE(Short, S),
1504 DECLARE_GETSETNATIVE(Char, C),
1505 DECLARE_GETSETNATIVE(Int, I),
1506 DECLARE_GETSETNATIVE(Long, J),
1507 DECLARE_GETSETNATIVE(Float, F),
1508 DECLARE_GETSETNATIVE(Double, D),
1509
1510 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1511 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1512
1513 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1514 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1515 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1516
1517 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1518 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1519 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1520 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1521 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1522 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1523 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1524 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1525
1526 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1527 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1528 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1529 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1530 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1531 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1532 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1533 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1534 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1535 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1536 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1537 };
1538
1539 JNINativeMethod loadavg_method[] = {
1540 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1541 };
1542
1543 JNINativeMethod prefetch_methods[] = {
1544 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1545 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1546 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1547 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1548 };
1549
1550 JNINativeMethod memcopy_methods_17[] = {
1551 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1552 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1553 };
1554
1555 JNINativeMethod memcopy_methods_15[] = {
1556 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1557 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1558 };
1559
1560 JNINativeMethod anonk_methods[] = {
1561 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1562 };
1563
1564 JNINativeMethod lform_methods[] = {
1565 {CC"shouldBeInitialized",CC"("CLS")Z", FN_PTR(Unsafe_ShouldBeInitialized)},
1566 };
1567
1568 JNINativeMethod fence_methods[] = {
1569 {CC"loadFence", CC"()V", FN_PTR(Unsafe_LoadFence)},
1570 {CC"storeFence", CC"()V", FN_PTR(Unsafe_StoreFence)},
1571 {CC"fullFence", CC"()V", FN_PTR(Unsafe_FullFence)},
1572 };
1573
1574 #undef CC
1575 #undef FN_PTR
1576
1577 #undef ADR
1578 #undef LANG
1579 #undef OBJ
1580 #undef CLS
1581 #undef CTR
1582 #undef FLD
1583 #undef MTH
1584 #undef THR
1585 #undef DC0_Args
1586 #undef DC_Args
1587
1588 #undef DECLARE_GETSETOOP
1589 #undef DECLARE_GETSETNATIVE
1590
1591
1592 /**
1593 * Helper method to register native methods.
1594 */
1595 static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1596 int status = env->RegisterNatives(clazz, methods, nMethods);
1597 if (status < 0 || env->ExceptionOccurred()) {
1598 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1599 tty->print_cr("Unsafe: failed registering %s", message);
1600 }
1601 env->ExceptionClear();
1602 return false;
1603 } else {
1604 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1605 tty->print_cr("Unsafe: successfully registered %s", message);
1606 }
1607 return true;
1608 }
1609 }
1610
1611
1612 // This one function is exported, used by NativeLookup.
1613 // The Unsafe_xxx functions above are called only from the interpreter.
1614 // The optimizer looks at names and signatures to recognize
1615 // individual functions.
1616
1617 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1618 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1619 {
1620 ThreadToNativeFromVM ttnfv(thread);
1621
1622 // Unsafe methods
1623 {
1624 bool success = false;
1625 // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6
1626 if (!success) {
1627 success = register_natives("1.6 methods", env, unsafecls, methods_16, sizeof(methods_16)/sizeof(JNINativeMethod));
1628 }
1629 if (!success) {
1630 success = register_natives("1.8 methods", env, unsafecls, methods_18, sizeof(methods_18)/sizeof(JNINativeMethod));
1631 }
1632 if (!success) {
1633 success = register_natives("1.5 methods", env, unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1634 }
1635 if (!success) {
1636 success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1637 }
1638 if (!success) {
1639 success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1640 }
1641 guarantee(success, "register unsafe natives");
1642 }
1643
1644 // Unsafe.getLoadAverage
1645 register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1646
1647 // Prefetch methods
1648 register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1649
1650 // Memory copy methods
1651 {
1652 bool success = false;
1653 if (!success) {
1654 success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod));
1655 }
1656 if (!success) {
1657 success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1658 }
1659 }
1660
1661 // Unsafe.defineAnonymousClass
1662 register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1663
1664 // Unsafe.shouldBeInitialized
1665 register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod));
1666
1667 // Fence methods
1668 register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod));
1669 }
1670 JVM_END