1 /*
2 * Copyright (c) 2000, 2014, 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 "utilities/macros.hpp"
28 #if INCLUDE_ALL_GCS
29 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
30 #endif // INCLUDE_ALL_GCS
31 #include "memory/allocation.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/prefetch.inline.hpp"
38 #include "runtime/orderAccess.inline.hpp"
39 #include "runtime/reflection.hpp"
40 #include "runtime/synchronizer.hpp"
41 #include "services/threadService.hpp"
42 #include "trace/tracing.hpp"
43 #include "utilities/copy.hpp"
44 #include "utilities/dtrace.hpp"
45
46 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
47
48 /*
49 * Implementation of class sun.misc.Unsafe
50 */
51
52
53 #define MAX_OBJECT_SIZE \
54 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
55 + ((julong)max_jint * sizeof(double)) )
56
57
58 #define UNSAFE_ENTRY(result_type, header) \
59 JVM_ENTRY(result_type, header)
60
61 // Can't use UNSAFE_LEAF because it has the signature of a straight
62 // call into the runtime (just like JVM_LEAF, funny that) but it's
63 // called like a Java Native and thus the wrapper built for it passes
64 // arguments like a JNI call. It expects those arguments to be popped
65 // from the stack on Intel like all good JNI args are, and adjusts the
66 // stack according. Since the JVM_LEAF call expects no extra
67 // arguments the stack isn't popped in the C code, is pushed by the
68 // wrapper and we get sick.
69 //#define UNSAFE_LEAF(result_type, header) \
70 // JVM_LEAF(result_type, header)
71
72 #define UNSAFE_END JVM_END
73
74 #define UnsafeWrapper(arg) /*nothing, for the present*/
75
76
77 inline void* addr_from_java(jlong addr) {
78 // This assert fails in a variety of ways on 32-bit systems.
79 // It is impossible to predict whether native code that converts
80 // pointers to longs will sign-extend or zero-extend the addresses.
81 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
82 return (void*)(uintptr_t)addr;
83 }
84
85 inline jlong addr_to_java(void* p) {
86 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
87 return (uintptr_t)p;
88 }
89
90
91 // Note: The VM's obj_field and related accessors use byte-scaled
92 // ("unscaled") offsets, just as the unsafe methods do.
93
94 // However, the method Unsafe.fieldOffset explicitly declines to
95 // guarantee this. The field offset values manipulated by the Java user
96 // through the Unsafe API are opaque cookies that just happen to be byte
97 // offsets. We represent this state of affairs by passing the cookies
98 // through conversion functions when going between the VM and the Unsafe API.
99 // The conversion functions just happen to be no-ops at present.
100
101 inline jlong field_offset_to_byte_offset(jlong field_offset) {
102 return field_offset;
103 }
104
105 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
106 return byte_offset;
107 }
108
109 inline jint invocation_key_from_method_slot(jint slot) {
110 return slot;
111 }
112
113 inline jint invocation_key_to_method_slot(jint key) {
114 return key;
115 }
116
117 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
118 jlong byte_offset = field_offset_to_byte_offset(field_offset);
119 #ifdef ASSERT
120 if (p != NULL) {
121 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
122 if (byte_offset == (jint)byte_offset) {
123 void* ptr_plus_disp = (address)p + byte_offset;
124 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
125 "raw [ptr+disp] must be consistent with oop::field_base");
126 }
127 jlong p_size = HeapWordSize * (jlong)(p->size());
128 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size));
129 }
130 #endif
131 if (sizeof(char*) == sizeof(jint)) // (this constant folds!)
132 return (address)p + (jint) byte_offset;
133 else
134 return (address)p + byte_offset;
135 }
136
137 // Externally callable versions:
138 // (Use these in compiler intrinsics which emulate unsafe primitives.)
139 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
140 return field_offset;
141 }
142 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
143 return byte_offset;
144 }
145 jint Unsafe_invocation_key_from_method_slot(jint slot) {
146 return invocation_key_from_method_slot(slot);
147 }
148 jint Unsafe_invocation_key_to_method_slot(jint key) {
149 return invocation_key_to_method_slot(key);
150 }
151
152
153 ///// Data in the Java heap.
154
155 #define GET_FIELD(obj, offset, type_name, v) \
156 oop p = JNIHandles::resolve(obj); \
157 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
158
159 #define SET_FIELD(obj, offset, type_name, x) \
160 oop p = JNIHandles::resolve(obj); \
161 *(type_name*)index_oop_from_field_offset_long(p, offset) = x
162
163 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
164 oop p = JNIHandles::resolve(obj); \
165 if (support_IRIW_for_not_multiple_copy_atomic_cpu) { \
166 OrderAccess::fence(); \
167 } \
168 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
169
170 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
171 oop p = JNIHandles::resolve(obj); \
172 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x);
173
174 // Macros for oops that check UseCompressedOops
175
176 #define GET_OOP_FIELD(obj, offset, v) \
177 oop p = JNIHandles::resolve(obj); \
178 oop v; \
179 if (UseCompressedOops) { \
180 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
181 v = oopDesc::decode_heap_oop(n); \
182 } else { \
183 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
184 }
185
186
187 // Get/SetObject must be special-cased, since it works with handles.
188
189 // These functions allow a null base pointer with an arbitrary address.
190 // But if the base pointer is non-null, the offset should make some sense.
191 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
192 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
193 UnsafeWrapper("Unsafe_GetObject");
194 GET_OOP_FIELD(obj, offset, v)
195 jobject ret = JNIHandles::make_local(env, v);
196 #if INCLUDE_ALL_GCS
197 // We could be accessing the referent field in a reference
198 // object. If G1 is enabled then we need to register non-null
199 // referent with the SATB barrier.
200 if (UseG1GC) {
201 bool needs_barrier = false;
202
203 if (ret != NULL) {
204 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) {
205 oop o = JNIHandles::resolve(obj);
206 Klass* k = o->klass();
207 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
208 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
209 needs_barrier = true;
210 }
211 }
212 }
213
214 if (needs_barrier) {
215 oop referent = JNIHandles::resolve(ret);
216 G1SATBCardTableModRefBS::enqueue(referent);
217 }
218 }
219 #endif // INCLUDE_ALL_GCS
220 return ret;
221 UNSAFE_END
222
223 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
224 UnsafeWrapper("Unsafe_SetObject");
225 oop x = JNIHandles::resolve(x_h);
226 oop p = JNIHandles::resolve(obj);
227 if (UseCompressedOops) {
228 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
229 } else {
230 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
231 }
232 UNSAFE_END
233
234 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
235 UnsafeWrapper("Unsafe_GetObjectVolatile");
236 oop p = JNIHandles::resolve(obj);
237 void* addr = index_oop_from_field_offset_long(p, offset);
238 volatile oop v;
239 if (UseCompressedOops) {
240 volatile narrowOop n = *(volatile narrowOop*) addr;
241 (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n));
242 } else {
243 (void)const_cast<oop&>(v = *(volatile oop*) addr);
244 }
245 OrderAccess::acquire();
246 return JNIHandles::make_local(env, v);
247 UNSAFE_END
248
249 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
250 UnsafeWrapper("Unsafe_SetObjectVolatile");
251 oop x = JNIHandles::resolve(x_h);
252 oop p = JNIHandles::resolve(obj);
253 void* addr = index_oop_from_field_offset_long(p, offset);
254 OrderAccess::release();
255 if (UseCompressedOops) {
256 oop_store((narrowOop*)addr, x);
257 } else {
258 oop_store((oop*)addr, x);
259 }
260 OrderAccess::fence();
261 UNSAFE_END
262
263 #ifndef SUPPORTS_NATIVE_CX8
264 // Keep old code for platforms which may not have atomic jlong (8 bytes) instructions
265
266 // Volatile long versions must use locks if !VM_Version::supports_cx8().
267 // support_cx8 is a surrogate for 'supports atomic long memory ops'.
268
269 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
270 UnsafeWrapper("Unsafe_GetLongVolatile");
271 {
272 if (VM_Version::supports_cx8()) {
273 GET_FIELD_VOLATILE(obj, offset, jlong, v);
274 return v;
275 }
276 else {
277 Handle p (THREAD, JNIHandles::resolve(obj));
278 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
279 ObjectLocker ol(p, THREAD);
280 jlong value = *addr;
281 return value;
282 }
283 }
284 UNSAFE_END
285
286 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
287 UnsafeWrapper("Unsafe_SetLongVolatile");
288 {
289 if (VM_Version::supports_cx8()) {
290 SET_FIELD_VOLATILE(obj, offset, jlong, x);
291 }
292 else {
293 Handle p (THREAD, JNIHandles::resolve(obj));
294 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
295 ObjectLocker ol(p, THREAD);
296 *addr = x;
297 }
298 }
299 UNSAFE_END
300
301 #endif // not SUPPORTS_NATIVE_CX8
302
303 #define DEFINE_GETSETOOP(jboolean, Boolean) \
304 \
305 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
306 UnsafeWrapper("Unsafe_Get"#Boolean); \
307 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
308 GET_FIELD(obj, offset, jboolean, v); \
309 return v; \
310 UNSAFE_END \
311 \
312 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
313 UnsafeWrapper("Unsafe_Set"#Boolean); \
314 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
315 SET_FIELD(obj, offset, jboolean, x); \
316 UNSAFE_END \
317 \
318 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
319 UnsafeWrapper("Unsafe_Get"#Boolean); \
320 GET_FIELD(obj, offset, jboolean, v); \
321 return v; \
322 UNSAFE_END \
323 \
324 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
325 UnsafeWrapper("Unsafe_Set"#Boolean); \
326 SET_FIELD(obj, offset, jboolean, x); \
327 UNSAFE_END \
328 \
329 // END DEFINE_GETSETOOP.
330
331 DEFINE_GETSETOOP(jboolean, Boolean)
332 DEFINE_GETSETOOP(jbyte, Byte)
333 DEFINE_GETSETOOP(jshort, Short);
334 DEFINE_GETSETOOP(jchar, Char);
335 DEFINE_GETSETOOP(jint, Int);
336 DEFINE_GETSETOOP(jlong, Long);
337 DEFINE_GETSETOOP(jfloat, Float);
338 DEFINE_GETSETOOP(jdouble, Double);
339
340 #undef DEFINE_GETSETOOP
341
342 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
343 \
344 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
345 UnsafeWrapper("Unsafe_Get"#Boolean); \
346 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
347 return v; \
348 UNSAFE_END \
349 \
350 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
351 UnsafeWrapper("Unsafe_Set"#Boolean); \
352 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
353 UNSAFE_END \
354 \
355 // END DEFINE_GETSETOOP_VOLATILE.
356
357 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
358 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
359 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
360 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
361 DEFINE_GETSETOOP_VOLATILE(jint, Int);
362 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
363 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
364
365 #ifdef SUPPORTS_NATIVE_CX8
366 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
367 #endif
368
369 #undef DEFINE_GETSETOOP_VOLATILE
370
371 // The non-intrinsified versions of setOrdered just use setVolatile
372
373 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
374 UnsafeWrapper("Unsafe_SetOrderedInt");
375 SET_FIELD_VOLATILE(obj, offset, jint, x);
376 UNSAFE_END
377
378 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
379 UnsafeWrapper("Unsafe_SetOrderedObject");
380 oop x = JNIHandles::resolve(x_h);
381 oop p = JNIHandles::resolve(obj);
382 void* addr = index_oop_from_field_offset_long(p, offset);
383 OrderAccess::release();
384 if (UseCompressedOops) {
385 oop_store((narrowOop*)addr, x);
386 } else {
387 oop_store((oop*)addr, x);
388 }
389 OrderAccess::fence();
390 UNSAFE_END
391
392 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
393 UnsafeWrapper("Unsafe_SetOrderedLong");
394 #ifdef SUPPORTS_NATIVE_CX8
395 SET_FIELD_VOLATILE(obj, offset, jlong, x);
396 #else
397 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
398 {
399 if (VM_Version::supports_cx8()) {
400 SET_FIELD_VOLATILE(obj, offset, jlong, x);
401 }
402 else {
403 Handle p (THREAD, JNIHandles::resolve(obj));
404 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
405 ObjectLocker ol(p, THREAD);
406 *addr = x;
407 }
408 }
409 #endif
410 UNSAFE_END
411
412 UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe))
413 UnsafeWrapper("Unsafe_LoadFence");
414 OrderAccess::acquire();
415 UNSAFE_END
416
417 UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe))
418 UnsafeWrapper("Unsafe_StoreFence");
419 OrderAccess::release();
420 UNSAFE_END
421
422 UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe))
423 UnsafeWrapper("Unsafe_FullFence");
424 OrderAccess::fence();
425 UNSAFE_END
426
427 ////// Data in the C heap.
428
429 // Note: These do not throw NullPointerException for bad pointers.
430 // They just crash. Only a oop base pointer can generate a NullPointerException.
431 //
432 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
433 \
434 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
435 UnsafeWrapper("Unsafe_GetNative"#Type); \
436 void* p = addr_from_java(addr); \
437 JavaThread* t = JavaThread::current(); \
438 t->set_doing_unsafe_access(true); \
439 java_type x = *(volatile native_type*)p; \
440 t->set_doing_unsafe_access(false); \
441 return x; \
442 UNSAFE_END \
443 \
444 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
445 UnsafeWrapper("Unsafe_SetNative"#Type); \
446 JavaThread* t = JavaThread::current(); \
447 t->set_doing_unsafe_access(true); \
448 void* p = addr_from_java(addr); \
449 *(volatile native_type*)p = x; \
450 t->set_doing_unsafe_access(false); \
451 UNSAFE_END \
452 \
453 // END DEFINE_GETSETNATIVE.
454
455 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
456 DEFINE_GETSETNATIVE(jshort, Short, signed short);
457 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
458 DEFINE_GETSETNATIVE(jint, Int, jint);
459 // no long -- handled specially
460 DEFINE_GETSETNATIVE(jfloat, Float, float);
461 DEFINE_GETSETNATIVE(jdouble, Double, double);
462
463 #undef DEFINE_GETSETNATIVE
464
465 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
466 UnsafeWrapper("Unsafe_GetNativeLong");
467 JavaThread* t = JavaThread::current();
468 // We do it this way to avoid problems with access to heap using 64
469 // bit loads, as jlong in heap could be not 64-bit aligned, and on
470 // some CPUs (SPARC) it leads to SIGBUS.
471 t->set_doing_unsafe_access(true);
472 void* p = addr_from_java(addr);
473 jlong x;
474 if (((intptr_t)p & 7) == 0) {
475 // jlong is aligned, do a volatile access
476 x = *(volatile jlong*)p;
477 } else {
478 jlong_accessor acc;
479 acc.words[0] = ((volatile jint*)p)[0];
480 acc.words[1] = ((volatile jint*)p)[1];
481 x = acc.long_value;
482 }
483 t->set_doing_unsafe_access(false);
484 return x;
485 UNSAFE_END
486
487 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
488 UnsafeWrapper("Unsafe_SetNativeLong");
489 JavaThread* t = JavaThread::current();
490 // see comment for Unsafe_GetNativeLong
491 t->set_doing_unsafe_access(true);
492 void* p = addr_from_java(addr);
493 if (((intptr_t)p & 7) == 0) {
494 // jlong is aligned, do a volatile access
495 *(volatile jlong*)p = x;
496 } else {
497 jlong_accessor acc;
498 acc.long_value = x;
499 ((volatile jint*)p)[0] = acc.words[0];
500 ((volatile jint*)p)[1] = acc.words[1];
501 }
502 t->set_doing_unsafe_access(false);
503 UNSAFE_END
504
505
506 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
507 UnsafeWrapper("Unsafe_GetNativeAddress");
508 void* p = addr_from_java(addr);
509 return addr_to_java(*(void**)p);
510 UNSAFE_END
511
512 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
513 UnsafeWrapper("Unsafe_SetNativeAddress");
514 void* p = addr_from_java(addr);
515 *(void**)p = addr_from_java(x);
516 UNSAFE_END
517
518
519 ////// Allocation requests
520
521 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
522 UnsafeWrapper("Unsafe_AllocateInstance");
523 {
524 ThreadToNativeFromVM ttnfv(thread);
525 return env->AllocObject(cls);
526 }
527 UNSAFE_END
528
529 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
530 UnsafeWrapper("Unsafe_AllocateMemory");
531 size_t sz = (size_t)size;
532 if (sz != (julong)size || size < 0) {
533 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
534 }
535 if (sz == 0) {
536 return 0;
537 }
538 sz = round_to(sz, HeapWordSize);
539 void* x = os::malloc(sz, mtInternal);
540 if (x == NULL) {
541 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
542 }
543 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
544 return addr_to_java(x);
545 UNSAFE_END
546
547 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
548 UnsafeWrapper("Unsafe_ReallocateMemory");
549 void* p = addr_from_java(addr);
550 size_t sz = (size_t)size;
551 if (sz != (julong)size || size < 0) {
552 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
553 }
554 if (sz == 0) {
555 os::free(p);
556 return 0;
557 }
558 sz = round_to(sz, HeapWordSize);
559 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal);
560 if (x == NULL) {
561 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
562 }
563 return addr_to_java(x);
564 UNSAFE_END
565
566 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
567 UnsafeWrapper("Unsafe_FreeMemory");
568 void* p = addr_from_java(addr);
569 if (p == NULL) {
570 return;
571 }
572 os::free(p);
573 UNSAFE_END
574
575 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
576 UnsafeWrapper("Unsafe_SetMemory");
577 size_t sz = (size_t)size;
578 if (sz != (julong)size || size < 0) {
579 THROW(vmSymbols::java_lang_IllegalArgumentException());
580 }
581 char* p = (char*) addr_from_java(addr);
582 Copy::fill_to_memory_atomic(p, sz, value);
583 UNSAFE_END
584
585 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
586 UnsafeWrapper("Unsafe_SetMemory");
587 size_t sz = (size_t)size;
588 if (sz != (julong)size || size < 0) {
589 THROW(vmSymbols::java_lang_IllegalArgumentException());
590 }
591 oop base = JNIHandles::resolve(obj);
592 void* p = index_oop_from_field_offset_long(base, offset);
593 Copy::fill_to_memory_atomic(p, sz, value);
594 UNSAFE_END
595
596 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
597 UnsafeWrapper("Unsafe_CopyMemory");
598 if (size == 0) {
599 return;
600 }
601 size_t sz = (size_t)size;
602 if (sz != (julong)size || size < 0) {
603 THROW(vmSymbols::java_lang_IllegalArgumentException());
604 }
605 void* src = addr_from_java(srcAddr);
606 void* dst = addr_from_java(dstAddr);
607 Copy::conjoint_memory_atomic(src, dst, sz);
608 UNSAFE_END
609
610 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
611 UnsafeWrapper("Unsafe_CopyMemory");
612 if (size == 0) {
613 return;
614 }
615 size_t sz = (size_t)size;
616 if (sz != (julong)size || size < 0) {
617 THROW(vmSymbols::java_lang_IllegalArgumentException());
618 }
619 oop srcp = JNIHandles::resolve(srcObj);
620 oop dstp = JNIHandles::resolve(dstObj);
621 if (dstp != NULL && !dstp->is_typeArray()) {
622 // NYI: This works only for non-oop arrays at present.
623 // Generalizing it would be reasonable, but requires card marking.
624 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
625 THROW(vmSymbols::java_lang_IllegalArgumentException());
626 }
627 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
628 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
629 Copy::conjoint_memory_atomic(src, dst, sz);
630 UNSAFE_END
631
632
633 ////// Random queries
634
635 // See comment at file start about UNSAFE_LEAF
636 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
637 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
638 UnsafeWrapper("Unsafe_AddressSize");
639 return sizeof(void*);
640 UNSAFE_END
641
642 // See comment at file start about UNSAFE_LEAF
643 //UNSAFE_LEAF(jint, Unsafe_PageSize())
644 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
645 UnsafeWrapper("Unsafe_PageSize");
646 return os::vm_page_size();
647 UNSAFE_END
648
649 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
650 if (field == NULL) {
651 THROW_0(vmSymbols::java_lang_NullPointerException());
652 }
653
654 oop reflected = JNIHandles::resolve_non_null(field);
655 oop mirror = java_lang_reflect_Field::clazz(reflected);
656 Klass* k = java_lang_Class::as_Klass(mirror);
657 int slot = java_lang_reflect_Field::slot(reflected);
658 int modifiers = java_lang_reflect_Field::modifiers(reflected);
659
660 if (must_be_static >= 0) {
661 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
662 if (must_be_static != really_is_static) {
663 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
664 }
665 }
666
667 int offset = InstanceKlass::cast(k)->field_offset(slot);
668 return field_offset_from_byte_offset(offset);
669 }
670
671 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
672 UnsafeWrapper("Unsafe_ObjectFieldOffset");
673 return find_field_offset(field, 0, THREAD);
674 UNSAFE_END
675
676 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
677 UnsafeWrapper("Unsafe_StaticFieldOffset");
678 return find_field_offset(field, 1, THREAD);
679 UNSAFE_END
680
681 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
682 UnsafeWrapper("Unsafe_StaticFieldBase");
683 // Note: In this VM implementation, a field address is always a short
684 // offset from the base of a a klass metaobject. Thus, the full dynamic
685 // range of the return type is never used. However, some implementations
686 // might put the static field inside an array shared by many classes,
687 // or even at a fixed address, in which case the address could be quite
688 // large. In that last case, this function would return NULL, since
689 // the address would operate alone, without any base pointer.
690
691 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
692
693 oop reflected = JNIHandles::resolve_non_null(field);
694 oop mirror = java_lang_reflect_Field::clazz(reflected);
695 int modifiers = java_lang_reflect_Field::modifiers(reflected);
696
697 if ((modifiers & JVM_ACC_STATIC) == 0) {
698 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
699 }
700
701 return JNIHandles::make_local(env, mirror);
702 UNSAFE_END
703
704 //@deprecated
705 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
706 UnsafeWrapper("Unsafe_FieldOffset");
707 // tries (but fails) to be polymorphic between static and non-static:
708 jlong offset = find_field_offset(field, -1, THREAD);
709 guarantee(offset == (jint)offset, "offset fits in 32 bits");
710 return (jint)offset;
711 UNSAFE_END
712
713 //@deprecated
714 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
715 UnsafeWrapper("Unsafe_StaticFieldBase");
716 if (clazz == NULL) {
717 THROW_0(vmSymbols::java_lang_NullPointerException());
718 }
719 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
720 UNSAFE_END
721
722 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
723 UnsafeWrapper("Unsafe_EnsureClassInitialized");
724 if (clazz == NULL) {
725 THROW(vmSymbols::java_lang_NullPointerException());
726 }
727 oop mirror = JNIHandles::resolve_non_null(clazz);
728
729 Klass* klass = java_lang_Class::as_Klass(mirror);
730 if (klass != NULL && klass->should_be_initialized()) {
731 InstanceKlass* k = InstanceKlass::cast(klass);
732 k->initialize(CHECK);
733 }
734 }
735 UNSAFE_END
736
737 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
738 UnsafeWrapper("Unsafe_ShouldBeInitialized");
739 if (clazz == NULL) {
740 THROW_(vmSymbols::java_lang_NullPointerException(), false);
741 }
742 oop mirror = JNIHandles::resolve_non_null(clazz);
743 Klass* klass = java_lang_Class::as_Klass(mirror);
744 if (klass != NULL && klass->should_be_initialized()) {
745 return true;
746 }
747 return false;
748 }
749 UNSAFE_END
750
751 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
752 if (acls == NULL) {
753 THROW(vmSymbols::java_lang_NullPointerException());
754 }
755 oop mirror = JNIHandles::resolve_non_null(acls);
756 Klass* k = java_lang_Class::as_Klass(mirror);
757 if (k == NULL || !k->oop_is_array()) {
758 THROW(vmSymbols::java_lang_InvalidClassException());
759 } else if (k->oop_is_objArray()) {
760 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
761 scale = heapOopSize;
762 } else if (k->oop_is_typeArray()) {
763 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
764 base = tak->array_header_in_bytes();
765 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
766 scale = (1 << tak->log2_element_size());
767 } else {
768 ShouldNotReachHere();
769 }
770 }
771
772 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
773 UnsafeWrapper("Unsafe_ArrayBaseOffset");
774 int base, scale;
775 getBaseAndScale(base, scale, acls, CHECK_0);
776 return field_offset_from_byte_offset(base);
777 UNSAFE_END
778
779
780 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
781 UnsafeWrapper("Unsafe_ArrayIndexScale");
782 int base, scale;
783 getBaseAndScale(base, scale, acls, CHECK_0);
784 // This VM packs both fields and array elements down to the byte.
785 // But watch out: If this changes, so that array references for
786 // a given primitive type (say, T_BOOLEAN) use different memory units
787 // than fields, this method MUST return zero for such arrays.
788 // For example, the VM used to store sub-word sized fields in full
789 // words in the object layout, so that accessors like getByte(Object,int)
790 // did not really do what one might expect for arrays. Therefore,
791 // this function used to report a zero scale factor, so that the user
792 // would know not to attempt to access sub-word array elements.
793 // // Code for unpacked fields:
794 // if (scale < wordSize) return 0;
795
796 // The following allows for a pretty general fieldOffset cookie scheme,
797 // but requires it to be linear in byte offset.
798 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
799 UNSAFE_END
800
801
802 static inline void throw_new(JNIEnv *env, const char *ename) {
803 char buf[100];
804 strcpy(buf, "java/lang/");
805 strcat(buf, ename);
806 jclass cls = env->FindClass(buf);
807 if (env->ExceptionCheck()) {
808 env->ExceptionClear();
809 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf);
810 return;
811 }
812 char* msg = NULL;
813 env->ThrowNew(cls, msg);
814 }
815
816 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
817 {
818 // Code lifted from JDK 1.3 ClassLoader.c
819
820 jbyte *body;
821 char *utfName;
822 jclass result = 0;
823 char buf[128];
824
825 if (UsePerfData) {
826 ClassLoader::unsafe_defineClassCallCounter()->inc();
827 }
828
829 if (data == NULL) {
830 throw_new(env, "NullPointerException");
831 return 0;
832 }
833
834 /* Work around 4153825. malloc crashes on Solaris when passed a
835 * negative size.
836 */
837 if (length < 0) {
838 throw_new(env, "ArrayIndexOutOfBoundsException");
839 return 0;
840 }
841
842 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
843
844 if (body == 0) {
845 throw_new(env, "OutOfMemoryError");
846 return 0;
847 }
848
849 env->GetByteArrayRegion(data, offset, length, body);
850
851 if (env->ExceptionOccurred())
852 goto free_body;
853
854 if (name != NULL) {
855 uint len = env->GetStringUTFLength(name);
856 int unicode_len = env->GetStringLength(name);
857 if (len >= sizeof(buf)) {
858 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
859 if (utfName == NULL) {
860 throw_new(env, "OutOfMemoryError");
861 goto free_body;
862 }
863 } else {
864 utfName = buf;
865 }
866 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
867 //VerifyFixClassname(utfName);
868 for (uint i = 0; i < len; i++) {
869 if (utfName[i] == '.') utfName[i] = '/';
870 }
871 } else {
872 utfName = NULL;
873 }
874
875 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
876
877 if (utfName && utfName != buf)
878 FREE_C_HEAP_ARRAY(char, utfName, mtInternal);
879
880 free_body:
881 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal);
882 return result;
883 }
884 }
885
886
887 UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
888 UnsafeWrapper("Unsafe_DefineClass");
889 {
890 ThreadToNativeFromVM ttnfv(thread);
891 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
892 }
893 UNSAFE_END
894
895 static jobject get_class_loader(JNIEnv* env, jclass cls) {
896 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
897 return NULL;
898 }
899 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
900 oop loader = k->class_loader();
901 return JNIHandles::make_local(env, loader);
902 }
903
904 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
905 UnsafeWrapper("Unsafe_DefineClass");
906 {
907 ThreadToNativeFromVM ttnfv(thread);
908
909 int depthFromDefineClass0 = 1;
910 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
911 jobject loader = (caller == NULL) ? NULL : get_class_loader(env, caller);
912 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
913
914 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
915 }
916 UNSAFE_END
917
918
919 #define DAC_Args CLS"[B["OBJ
920 // define a class but do not make it known to the class loader or system dictionary
921 // - host_class: supplies context for linkage, access control, protection domain, and class loader
922 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
923 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
924
925 // When you load an anonymous class U, it works as if you changed its name just before loading,
926 // to a name that you will never use again. Since the name is lost, no other class can directly
927 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
928 // through java.lang.Class methods like Class.newInstance.
929
930 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
931 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
932 // An anonymous class also has special privileges to access any member of its host class.
933 // This is the main reason why this loading operation is unsafe. The purpose of this is to
934 // allow language implementations to simulate "open classes"; a host class in effect gets
935 // new code when an anonymous class is loaded alongside it. A less convenient but more
936 // standard way to do this is with reflection, which can also be set to ignore access
937 // restrictions.
938
939 // Access into an anonymous class is possible only through reflection. Therefore, there
940 // are no special access rules for calling into an anonymous class. The relaxed access
941 // rule for the host class is applied in the opposite direction: A host class reflectively
942 // access one of its anonymous classes.
943
944 // If you load the same bytecodes twice, you get two different classes. You can reload
945 // the same bytecodes with or without varying CP patches.
946
947 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
948 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
949 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
950
951 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
952 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
953 // It is not possible for a named class, or an older anonymous class, to refer by
954 // name (via its CP) to a newer anonymous class.
955
956 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
957 // or type descriptors used in the loaded anonymous class.
958
959 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
960 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
961 // be changed to println(greeting), where greeting is an arbitrary object created before
962 // the anonymous class is loaded. This is useful in dynamic languages, in which
963 // various kinds of metaobjects must be introduced as constants into bytecode.
964 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
965 // not just a literal string. For such ldc instructions, the verifier uses the
966 // type Object instead of String, if the loaded constant is not in fact a String.
967
968 static instanceKlassHandle
969 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
970 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
971 HeapWord* *temp_alloc,
972 TRAPS) {
973
974 if (UsePerfData) {
975 ClassLoader::unsafe_defineClassCallCounter()->inc();
976 }
977
978 if (data == NULL) {
979 THROW_0(vmSymbols::java_lang_NullPointerException());
980 }
981
982 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
983 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
984 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal);
985 if (body == NULL) {
986 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
987 }
988
989 // caller responsible to free it:
990 (*temp_alloc) = body;
991
992 {
993 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
994 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
995 }
996
997 u1* class_bytes = (u1*) body;
998 int class_bytes_length = (int) length;
999 if (class_bytes_length < 0) class_bytes_length = 0;
1000 if (class_bytes == NULL
1001 || host_class == NULL
1002 || length != class_bytes_length)
1003 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1004
1005 objArrayHandle cp_patches_h;
1006 if (cp_patches_jh != NULL) {
1007 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1008 if (!p->is_objArray())
1009 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1010 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1011 }
1012
1013 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class)));
1014 const char* host_source = host_klass->external_name();
1015 Handle host_loader(THREAD, host_klass->class_loader());
1016 Handle host_domain(THREAD, host_klass->protection_domain());
1017
1018 GrowableArray<Handle>* cp_patches = NULL;
1019 if (cp_patches_h.not_null()) {
1020 int alen = cp_patches_h->length();
1021 for (int i = alen-1; i >= 0; i--) {
1022 oop p = cp_patches_h->obj_at(i);
1023 if (p != NULL) {
1024 Handle patch(THREAD, p);
1025 if (cp_patches == NULL)
1026 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1027 cp_patches->at_put(i, patch);
1028 }
1029 }
1030 }
1031
1032 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1033
1034 instanceKlassHandle anon_klass;
1035 {
1036 Symbol* no_class_name = NULL;
1037 Klass* anonk = SystemDictionary::parse_stream(no_class_name,
1038 host_loader, host_domain,
1039 &st, host_klass, cp_patches,
1040 CHECK_NULL);
1041 if (anonk == NULL) return NULL;
1042 anon_klass = instanceKlassHandle(THREAD, anonk);
1043 }
1044
1045 return anon_klass;
1046 }
1047
1048 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1049 {
1050 instanceKlassHandle anon_klass;
1051 jobject res_jh = NULL;
1052
1053 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1054 ResourceMark rm(THREAD);
1055
1056 HeapWord* temp_alloc = NULL;
1057
1058 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data,
1059 cp_patches_jh,
1060 &temp_alloc, THREAD);
1061 if (anon_klass() != NULL)
1062 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
1063
1064 // try/finally clause:
1065 if (temp_alloc != NULL) {
1066 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal);
1067 }
1068
1069 // The anonymous class loader data has been artificially been kept alive to
1070 // this point. The mirror and any instances of this class have to keep
1071 // it alive afterwards.
1072 if (anon_klass() != NULL) {
1073 anon_klass->class_loader_data()->set_keep_alive(false);
1074 }
1075
1076 // let caller initialize it as needed...
1077
1078 return (jclass) res_jh;
1079 }
1080 UNSAFE_END
1081
1082
1083
1084 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1085 UnsafeWrapper("Unsafe_MonitorEnter");
1086 {
1087 if (jobj == NULL) {
1088 THROW(vmSymbols::java_lang_NullPointerException());
1089 }
1090 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1091 ObjectSynchronizer::jni_enter(obj, CHECK);
1092 }
1093 UNSAFE_END
1094
1095
1096 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1097 UnsafeWrapper("Unsafe_TryMonitorEnter");
1098 {
1099 if (jobj == NULL) {
1100 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1101 }
1102 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1103 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1104 return (res ? JNI_TRUE : JNI_FALSE);
1105 }
1106 UNSAFE_END
1107
1108
1109 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1110 UnsafeWrapper("Unsafe_MonitorExit");
1111 {
1112 if (jobj == NULL) {
1113 THROW(vmSymbols::java_lang_NullPointerException());
1114 }
1115 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1116 ObjectSynchronizer::jni_exit(obj(), CHECK);
1117 }
1118 UNSAFE_END
1119
1120
1121 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1122 UnsafeWrapper("Unsafe_ThrowException");
1123 {
1124 ThreadToNativeFromVM ttnfv(thread);
1125 env->Throw(thr);
1126 }
1127 UNSAFE_END
1128
1129 // JSR166 ------------------------------------------------------------------
1130
1131 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1132 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1133 oop x = JNIHandles::resolve(x_h);
1134 oop e = JNIHandles::resolve(e_h);
1135 oop p = JNIHandles::resolve(obj);
1136 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1137 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
1138 jboolean success = (res == e);
1139 if (success)
1140 update_barrier_set((void*)addr, x);
1141 return success;
1142 UNSAFE_END
1143
1144 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1145 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1146 oop p = JNIHandles::resolve(obj);
1147 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1148 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1149 UNSAFE_END
1150
1151 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1152 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1153 Handle p (THREAD, JNIHandles::resolve(obj));
1154 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1155 if (VM_Version::supports_cx8())
1156 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1157 else {
1158 jboolean success = false;
1159 ObjectLocker ol(p, THREAD);
1160 if (*addr == e) { *addr = x; success = true; }
1161 return success;
1162 }
1163 UNSAFE_END
1164
1165 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1166 UnsafeWrapper("Unsafe_Park");
1167 EventThreadPark event;
1168 HOTSPOT_THREAD_PARK_BEGIN((uintptr_t) thread->parker(), (int) isAbsolute, time);
1169
1170 JavaThreadParkedState jtps(thread, time != 0);
1171 thread->parker()->park(isAbsolute != 0, time);
1172
1173 HOTSPOT_THREAD_PARK_END((uintptr_t) thread->parker());
1174 if (event.should_commit()) {
1175 oop obj = thread->current_park_blocker();
1176 event.set_klass((obj != NULL) ? obj->klass() : NULL);
1177 event.set_timeout(time);
1178 event.set_address((obj != NULL) ? (TYPE_ADDRESS) cast_from_oop<uintptr_t>(obj) : 0);
1179 event.commit();
1180 }
1181 UNSAFE_END
1182
1183 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1184 UnsafeWrapper("Unsafe_Unpark");
1185 Parker* p = NULL;
1186 if (jthread != NULL) {
1187 oop java_thread = JNIHandles::resolve_non_null(jthread);
1188 if (java_thread != NULL) {
1189 jlong lp = java_lang_Thread::park_event(java_thread);
1190 if (lp != 0) {
1191 // This cast is OK even though the jlong might have been read
1192 // non-atomically on 32bit systems, since there, one word will
1193 // always be zero anyway and the value set is always the same
1194 p = (Parker*)addr_from_java(lp);
1195 } else {
1196 // Grab lock if apparently null or using older version of library
1197 MutexLocker mu(Threads_lock);
1198 java_thread = JNIHandles::resolve_non_null(jthread);
1199 if (java_thread != NULL) {
1200 JavaThread* thr = java_lang_Thread::thread(java_thread);
1201 if (thr != NULL) {
1202 p = thr->parker();
1203 if (p != NULL) { // Bind to Java thread for next time.
1204 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1205 }
1206 }
1207 }
1208 }
1209 }
1210 }
1211 if (p != NULL) {
1212 HOTSPOT_THREAD_UNPARK((uintptr_t) p);
1213 p->unpark();
1214 }
1215 UNSAFE_END
1216
1217 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1218 UnsafeWrapper("Unsafe_Loadavg");
1219 const int max_nelem = 3;
1220 double la[max_nelem];
1221 jint ret;
1222
1223 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1224 assert(a->is_typeArray(), "must be type array");
1225
1226 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1227 ThreadToNativeFromVM ttnfv(thread);
1228 throw_new(env, "ArrayIndexOutOfBoundsException");
1229 return -1;
1230 }
1231
1232 ret = os::loadavg(la, nelem);
1233 if (ret == -1) return -1;
1234
1235 // if successful, ret is the number of samples actually retrieved.
1236 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1237 switch(ret) {
1238 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1239 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1240 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1241 }
1242 return ret;
1243 UNSAFE_END
1244
1245 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1246 UnsafeWrapper("Unsafe_PrefetchRead");
1247 oop p = JNIHandles::resolve(obj);
1248 void* addr = index_oop_from_field_offset_long(p, 0);
1249 Prefetch::read(addr, (intx)offset);
1250 UNSAFE_END
1251
1252 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1253 UnsafeWrapper("Unsafe_PrefetchWrite");
1254 oop p = JNIHandles::resolve(obj);
1255 void* addr = index_oop_from_field_offset_long(p, 0);
1256 Prefetch::write(addr, (intx)offset);
1257 UNSAFE_END
1258
1259
1260 /// JVM_RegisterUnsafeMethods
1261
1262 #define ADR "J"
1263
1264 #define LANG "Ljava/lang/"
1265
1266 #define OBJ LANG"Object;"
1267 #define CLS LANG"Class;"
1268 #define CTR LANG"reflect/Constructor;"
1269 #define FLD LANG"reflect/Field;"
1270 #define MTH LANG"reflect/Method;"
1271 #define THR LANG"Throwable;"
1272
1273 #define DC0_Args LANG"String;[BII"
1274 #define DC_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1275
1276 #define CC (char*) /*cast a literal from (const char*)*/
1277 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1278
1279 // define deprecated accessors for compabitility with 1.4.0
1280 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1281 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1282 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1283
1284 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1285 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1286 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1287 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1288
1289 // Note: In 1.5.0, there are volatile versions too
1290 #define DECLARE_GETSETOOP(Boolean, Z) \
1291 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1292 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1293 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1294 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1295
1296
1297 #define DECLARE_GETSETNATIVE(Byte, B) \
1298 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1299 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1300
1301
1302
1303 // These are the methods for 1.4.0
1304 static JNINativeMethod methods_140[] = {
1305 DECLARE_GETSETOOP_140(Boolean, Z),
1306 DECLARE_GETSETOOP_140(Byte, B),
1307 DECLARE_GETSETOOP_140(Short, S),
1308 DECLARE_GETSETOOP_140(Char, C),
1309 DECLARE_GETSETOOP_140(Int, I),
1310 DECLARE_GETSETOOP_140(Long, J),
1311 DECLARE_GETSETOOP_140(Float, F),
1312 DECLARE_GETSETOOP_140(Double, D),
1313
1314 DECLARE_GETSETNATIVE(Byte, B),
1315 DECLARE_GETSETNATIVE(Short, S),
1316 DECLARE_GETSETNATIVE(Char, C),
1317 DECLARE_GETSETNATIVE(Int, I),
1318 DECLARE_GETSETNATIVE(Long, J),
1319 DECLARE_GETSETNATIVE(Float, F),
1320 DECLARE_GETSETNATIVE(Double, D),
1321
1322 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1323 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1324
1325 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1326 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1327 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1328
1329 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)},
1330 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)},
1331 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1332 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1333 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1334 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1335 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1336
1337 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1338 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1339 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1340 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1341 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1342 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1343 };
1344
1345 // These are the methods prior to the JSR 166 changes in 1.5.0
1346 static JNINativeMethod methods_141[] = {
1347 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1348 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1349
1350 DECLARE_GETSETOOP_141(Boolean, Z),
1351 DECLARE_GETSETOOP_141(Byte, B),
1352 DECLARE_GETSETOOP_141(Short, S),
1353 DECLARE_GETSETOOP_141(Char, C),
1354 DECLARE_GETSETOOP_141(Int, I),
1355 DECLARE_GETSETOOP_141(Long, J),
1356 DECLARE_GETSETOOP_141(Float, F),
1357 DECLARE_GETSETOOP_141(Double, D),
1358
1359 DECLARE_GETSETNATIVE(Byte, B),
1360 DECLARE_GETSETNATIVE(Short, S),
1361 DECLARE_GETSETNATIVE(Char, C),
1362 DECLARE_GETSETNATIVE(Int, I),
1363 DECLARE_GETSETNATIVE(Long, J),
1364 DECLARE_GETSETNATIVE(Float, F),
1365 DECLARE_GETSETNATIVE(Double, D),
1366
1367 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1368 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1369
1370 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1371 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1372 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1373
1374 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1375 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1376 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1377 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1378 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1379 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1380 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1381 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1382
1383 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1384 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1385 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1386 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1387 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1388 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1389
1390 };
1391
1392 // These are the methods prior to the JSR 166 changes in 1.6.0
1393 static JNINativeMethod methods_15[] = {
1394 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1395 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1396 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1397 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1398
1399
1400 DECLARE_GETSETOOP(Boolean, Z),
1401 DECLARE_GETSETOOP(Byte, B),
1402 DECLARE_GETSETOOP(Short, S),
1403 DECLARE_GETSETOOP(Char, C),
1404 DECLARE_GETSETOOP(Int, I),
1405 DECLARE_GETSETOOP(Long, J),
1406 DECLARE_GETSETOOP(Float, F),
1407 DECLARE_GETSETOOP(Double, D),
1408
1409 DECLARE_GETSETNATIVE(Byte, B),
1410 DECLARE_GETSETNATIVE(Short, S),
1411 DECLARE_GETSETNATIVE(Char, C),
1412 DECLARE_GETSETNATIVE(Int, I),
1413 DECLARE_GETSETNATIVE(Long, J),
1414 DECLARE_GETSETNATIVE(Float, F),
1415 DECLARE_GETSETNATIVE(Double, D),
1416
1417 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1418 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1419
1420 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1421 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1422 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1423
1424 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1425 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1426 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1427 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1428 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1429 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1430 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1431 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1432
1433 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1434 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1435 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1436 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1437 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1438 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1439 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1440 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1441 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1442 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1443 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1444
1445 };
1446
1447 // These are the methods for 1.6.0 and 1.7.0
1448 static JNINativeMethod methods_16[] = {
1449 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1450 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1451 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1452 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1453
1454 DECLARE_GETSETOOP(Boolean, Z),
1455 DECLARE_GETSETOOP(Byte, B),
1456 DECLARE_GETSETOOP(Short, S),
1457 DECLARE_GETSETOOP(Char, C),
1458 DECLARE_GETSETOOP(Int, I),
1459 DECLARE_GETSETOOP(Long, J),
1460 DECLARE_GETSETOOP(Float, F),
1461 DECLARE_GETSETOOP(Double, D),
1462
1463 DECLARE_GETSETNATIVE(Byte, B),
1464 DECLARE_GETSETNATIVE(Short, S),
1465 DECLARE_GETSETNATIVE(Char, C),
1466 DECLARE_GETSETNATIVE(Int, I),
1467 DECLARE_GETSETNATIVE(Long, J),
1468 DECLARE_GETSETNATIVE(Float, F),
1469 DECLARE_GETSETNATIVE(Double, D),
1470
1471 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1472 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1473
1474 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1475 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1476 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1477
1478 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1479 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1480 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1481 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1482 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1483 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1484 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1485 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1486
1487 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1488 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1489 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1490 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1491 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1492 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1493 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1494 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1495 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1496 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1497 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1498 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1499 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1500 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1501 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1502 };
1503
1504 // These are the methods for 1.8.0
1505 static JNINativeMethod methods_18[] = {
1506 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1507 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1508 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1509 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1510
1511 DECLARE_GETSETOOP(Boolean, Z),
1512 DECLARE_GETSETOOP(Byte, B),
1513 DECLARE_GETSETOOP(Short, S),
1514 DECLARE_GETSETOOP(Char, C),
1515 DECLARE_GETSETOOP(Int, I),
1516 DECLARE_GETSETOOP(Long, J),
1517 DECLARE_GETSETOOP(Float, F),
1518 DECLARE_GETSETOOP(Double, D),
1519
1520 DECLARE_GETSETNATIVE(Byte, B),
1521 DECLARE_GETSETNATIVE(Short, S),
1522 DECLARE_GETSETNATIVE(Char, C),
1523 DECLARE_GETSETNATIVE(Int, I),
1524 DECLARE_GETSETNATIVE(Long, J),
1525 DECLARE_GETSETNATIVE(Float, F),
1526 DECLARE_GETSETNATIVE(Double, D),
1527
1528 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1529 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1530
1531 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1532 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1533 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1534
1535 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1536 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1537 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1538 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1539 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1540 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1541 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1542 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1543
1544 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1545 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1546 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1547 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1548 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1549 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1550 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1551 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1552 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1553 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1554 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1555 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1556 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1557 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1558 };
1559
1560 JNINativeMethod loadavg_method[] = {
1561 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1562 };
1563
1564 JNINativeMethod prefetch_methods[] = {
1565 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1566 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1567 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1568 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1569 };
1570
1571 JNINativeMethod memcopy_methods_17[] = {
1572 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1573 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1574 };
1575
1576 JNINativeMethod memcopy_methods_15[] = {
1577 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1578 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1579 };
1580
1581 JNINativeMethod anonk_methods[] = {
1582 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1583 };
1584
1585 JNINativeMethod lform_methods[] = {
1586 {CC"shouldBeInitialized",CC"("CLS")Z", FN_PTR(Unsafe_ShouldBeInitialized)},
1587 };
1588
1589 JNINativeMethod fence_methods[] = {
1590 {CC"loadFence", CC"()V", FN_PTR(Unsafe_LoadFence)},
1591 {CC"storeFence", CC"()V", FN_PTR(Unsafe_StoreFence)},
1592 {CC"fullFence", CC"()V", FN_PTR(Unsafe_FullFence)},
1593 };
1594
1595 #undef CC
1596 #undef FN_PTR
1597
1598 #undef ADR
1599 #undef LANG
1600 #undef OBJ
1601 #undef CLS
1602 #undef CTR
1603 #undef FLD
1604 #undef MTH
1605 #undef THR
1606 #undef DC0_Args
1607 #undef DC_Args
1608
1609 #undef DECLARE_GETSETOOP
1610 #undef DECLARE_GETSETNATIVE
1611
1612
1613 /**
1614 * Helper method to register native methods.
1615 */
1616 static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1617 int status = env->RegisterNatives(clazz, methods, nMethods);
1618 if (status < 0 || env->ExceptionOccurred()) {
1619 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1620 tty->print_cr("Unsafe: failed registering %s", message);
1621 }
1622 env->ExceptionClear();
1623 return false;
1624 } else {
1625 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1626 tty->print_cr("Unsafe: successfully registered %s", message);
1627 }
1628 return true;
1629 }
1630 }
1631
1632
1633 // This one function is exported, used by NativeLookup.
1634 // The Unsafe_xxx functions above are called only from the interpreter.
1635 // The optimizer looks at names and signatures to recognize
1636 // individual functions.
1637
1638 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1639 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1640 {
1641 ThreadToNativeFromVM ttnfv(thread);
1642
1643 // Unsafe methods
1644 {
1645 bool success = false;
1646 // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6
1647 if (!success) {
1648 success = register_natives("1.6 methods", env, unsafecls, methods_16, sizeof(methods_16)/sizeof(JNINativeMethod));
1649 }
1650 if (!success) {
1651 success = register_natives("1.8 methods", env, unsafecls, methods_18, sizeof(methods_18)/sizeof(JNINativeMethod));
1652 }
1653 if (!success) {
1654 success = register_natives("1.5 methods", env, unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1655 }
1656 if (!success) {
1657 success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1658 }
1659 if (!success) {
1660 success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1661 }
1662 guarantee(success, "register unsafe natives");
1663 }
1664
1665 // Unsafe.getLoadAverage
1666 register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1667
1668 // Prefetch methods
1669 register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1670
1671 // Memory copy methods
1672 {
1673 bool success = false;
1674 if (!success) {
1675 success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod));
1676 }
1677 if (!success) {
1678 success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1679 }
1680 }
1681
1682 // Unsafe.defineAnonymousClass
1683 register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1684
1685 // Unsafe.shouldBeInitialized
1686 register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod));
1687
1688 // Fence methods
1689 register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod));
1690 }
1691 JVM_END