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/globals.hpp"
35 #include "runtime/interfaceSupport.hpp"
36 #include "runtime/prefetch.inline.hpp"
37 #include "runtime/orderAccess.inline.hpp"
38 #include "runtime/reflection.hpp"
39 #include "runtime/synchronizer.hpp"
40 #include "services/threadService.hpp"
41 #include "trace/tracing.hpp"
42 #include "utilities/copy.hpp"
43 #include "utilities/dtrace.hpp"
44
45 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
46
47 /*
48 * Implementation of class sun.misc.Unsafe
49 */
50
51 #ifndef USDT2
52 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long);
53 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t);
54 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t);
55 #endif /* !USDT2 */
56
57 #define MAX_OBJECT_SIZE \
58 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
59 + ((julong)max_jint * sizeof(double)) )
60
61
62 #define UNSAFE_ENTRY(result_type, header) \
63 JVM_ENTRY(result_type, header)
64
65 // Can't use UNSAFE_LEAF because it has the signature of a straight
66 // call into the runtime (just like JVM_LEAF, funny that) but it's
67 // called like a Java Native and thus the wrapper built for it passes
68 // arguments like a JNI call. It expects those arguments to be popped
69 // from the stack on Intel like all good JNI args are, and adjusts the
70 // stack according. Since the JVM_LEAF call expects no extra
71 // arguments the stack isn't popped in the C code, is pushed by the
72 // wrapper and we get sick.
73 //#define UNSAFE_LEAF(result_type, header) \
74 // JVM_LEAF(result_type, header)
75
76 #define UNSAFE_END JVM_END
77
78 #define UnsafeWrapper(arg) /*nothing, for the present*/
79
80
81 inline void* addr_from_java(jlong addr) {
82 // This assert fails in a variety of ways on 32-bit systems.
83 // It is impossible to predict whether native code that converts
84 // pointers to longs will sign-extend or zero-extend the addresses.
85 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
86 return (void*)(uintptr_t)addr;
87 }
88
89 inline jlong addr_to_java(void* p) {
90 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
91 return (uintptr_t)p;
92 }
93
94
95 // Note: The VM's obj_field and related accessors use byte-scaled
96 // ("unscaled") offsets, just as the unsafe methods do.
97
98 // However, the method Unsafe.fieldOffset explicitly declines to
99 // guarantee this. The field offset values manipulated by the Java user
100 // through the Unsafe API are opaque cookies that just happen to be byte
101 // offsets. We represent this state of affairs by passing the cookies
102 // through conversion functions when going between the VM and the Unsafe API.
103 // The conversion functions just happen to be no-ops at present.
104
105 inline jlong field_offset_to_byte_offset(jlong field_offset) {
106 return field_offset;
107 }
108
109 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
110 return byte_offset;
111 }
112
113 inline jint invocation_key_from_method_slot(jint slot) {
114 return slot;
115 }
116
117 inline jint invocation_key_to_method_slot(jint key) {
118 return key;
119 }
120
121 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
122 jlong byte_offset = field_offset_to_byte_offset(field_offset);
123 #ifdef ASSERT
124 if (p != NULL) {
125 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
126 if (byte_offset == (jint)byte_offset) {
127 void* ptr_plus_disp = (address)p + byte_offset;
128 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
129 "raw [ptr+disp] must be consistent with oop::field_base");
130 }
131 jlong p_size = HeapWordSize * (jlong)(p->size());
132 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size));
133 }
134 #endif
135 if (sizeof(char*) == sizeof(jint)) // (this constant folds!)
136 return (address)p + (jint) byte_offset;
137 else
138 return (address)p + byte_offset;
139 }
140
141 // Externally callable versions:
142 // (Use these in compiler intrinsics which emulate unsafe primitives.)
143 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
144 return field_offset;
145 }
146 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
147 return byte_offset;
148 }
149 jint Unsafe_invocation_key_from_method_slot(jint slot) {
150 return invocation_key_from_method_slot(slot);
151 }
152 jint Unsafe_invocation_key_to_method_slot(jint key) {
153 return invocation_key_to_method_slot(key);
154 }
155
156
157 ///// Data in the Java heap.
158
159 #define GET_FIELD(obj, offset, type_name, v) \
160 oop p = JNIHandles::resolve(obj); \
161 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
162
163 #define SET_FIELD(obj, offset, type_name, x) \
164 oop p = JNIHandles::resolve(obj); \
165 *(type_name*)index_oop_from_field_offset_long(p, offset) = x
166
167 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
168 oop p = JNIHandles::resolve(obj); \
169 if (support_IRIW_for_not_multiple_copy_atomic_cpu) { \
170 OrderAccess::fence(); \
171 } \
172 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
173
174 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
175 oop p = JNIHandles::resolve(obj); \
176 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x);
177
178 // Macros for oops that check UseCompressedOops
179
180 #define GET_OOP_FIELD(obj, offset, v) \
181 oop p = JNIHandles::resolve(obj); \
182 oop v; \
183 if (UseCompressedOops) { \
184 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
185 v = oopDesc::decode_heap_oop(n); \
186 } else { \
187 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
188 }
189
190
191 // Get/SetObject must be special-cased, since it works with handles.
192
193 // The xxx140 variants for backward compatibility do not allow a full-width offset.
194 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
195 UnsafeWrapper("Unsafe_GetObject");
196 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
197 GET_OOP_FIELD(obj, offset, v)
198 jobject ret = JNIHandles::make_local(env, v);
199 #if INCLUDE_ALL_GCS
200 // We could be accessing the referent field in a reference
201 // object. If G1 is enabled then we need to register a non-null
202 // referent with the SATB barrier.
203 if (UseG1GC) {
204 bool needs_barrier = false;
205
206 if (ret != NULL) {
207 if (offset == java_lang_ref_Reference::referent_offset) {
208 oop o = JNIHandles::resolve_non_null(obj);
209 Klass* k = o->klass();
210 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
211 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
212 needs_barrier = true;
213 }
214 }
215 }
216
217 if (needs_barrier) {
218 oop referent = JNIHandles::resolve(ret);
219 G1SATBCardTableModRefBS::enqueue(referent);
220 }
221 }
222 #endif // INCLUDE_ALL_GCS
223 return ret;
224 UNSAFE_END
225
226 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
227 UnsafeWrapper("Unsafe_SetObject");
228 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
229 oop x = JNIHandles::resolve(x_h);
230 //SET_FIELD(obj, offset, oop, x);
231 oop p = JNIHandles::resolve(obj);
232 if (UseCompressedOops) {
233 if (x != NULL) {
234 // If there is a heap base pointer, we are obliged to emit a store barrier.
235 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
236 } else {
237 narrowOop n = oopDesc::encode_heap_oop_not_null(x);
238 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
239 }
240 } else {
241 if (x != NULL) {
242 // If there is a heap base pointer, we are obliged to emit a store barrier.
243 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
244 } else {
245 *(oop*)index_oop_from_field_offset_long(p, offset) = x;
246 }
247 }
248 UNSAFE_END
249
250 // The normal variants allow a null base pointer with an arbitrary address.
251 // But if the base pointer is non-null, the offset should make some sense.
252 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
253 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
254 UnsafeWrapper("Unsafe_GetObject");
255 GET_OOP_FIELD(obj, offset, v)
256 jobject ret = JNIHandles::make_local(env, v);
257 #if INCLUDE_ALL_GCS
258 // We could be accessing the referent field in a reference
259 // object. If G1 is enabled then we need to register non-null
260 // referent with the SATB barrier.
261 if (UseG1GC) {
262 bool needs_barrier = false;
263
264 if (ret != NULL) {
265 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) {
266 oop o = JNIHandles::resolve(obj);
267 Klass* k = o->klass();
268 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
269 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
270 needs_barrier = true;
271 }
272 }
273 }
274
275 if (needs_barrier) {
276 oop referent = JNIHandles::resolve(ret);
277 G1SATBCardTableModRefBS::enqueue(referent);
278 }
279 }
280 #endif // INCLUDE_ALL_GCS
281 return ret;
282 UNSAFE_END
283
284 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
285 UnsafeWrapper("Unsafe_SetObject");
286 oop x = JNIHandles::resolve(x_h);
287 oop p = JNIHandles::resolve(obj);
288 if (UseCompressedOops) {
289 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
290 } else {
291 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
292 }
293 UNSAFE_END
294
295 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
296 UnsafeWrapper("Unsafe_GetObjectVolatile");
297 oop p = JNIHandles::resolve(obj);
298 void* addr = index_oop_from_field_offset_long(p, offset);
299 volatile oop v;
300 if (UseCompressedOops) {
301 volatile narrowOop n = *(volatile narrowOop*) addr;
302 (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n));
303 } else {
304 (void)const_cast<oop&>(v = *(volatile oop*) addr);
305 }
306 OrderAccess::acquire();
307 return JNIHandles::make_local(env, v);
308 UNSAFE_END
309
310 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
311 UnsafeWrapper("Unsafe_SetObjectVolatile");
312 oop x = JNIHandles::resolve(x_h);
313 oop p = JNIHandles::resolve(obj);
314 void* addr = index_oop_from_field_offset_long(p, offset);
315 OrderAccess::release();
316 if (UseCompressedOops) {
317 oop_store((narrowOop*)addr, x);
318 } else {
319 oop_store((oop*)addr, x);
320 }
321 OrderAccess::fence();
322 UNSAFE_END
323
324 #ifndef SUPPORTS_NATIVE_CX8
325 // Keep old code for platforms which may not have atomic jlong (8 bytes) instructions
326
327 // Volatile long versions must use locks if !VM_Version::supports_cx8().
328 // support_cx8 is a surrogate for 'supports atomic long memory ops'.
329
330 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
331 UnsafeWrapper("Unsafe_GetLongVolatile");
332 {
333 if (VM_Version::supports_cx8()) {
334 GET_FIELD_VOLATILE(obj, offset, jlong, v);
335 return v;
336 }
337 else {
338 Handle p (THREAD, JNIHandles::resolve(obj));
339 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
340 ObjectLocker ol(p, THREAD);
341 jlong value = *addr;
342 return value;
343 }
344 }
345 UNSAFE_END
346
347 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
348 UnsafeWrapper("Unsafe_SetLongVolatile");
349 {
350 if (VM_Version::supports_cx8()) {
351 SET_FIELD_VOLATILE(obj, offset, jlong, x);
352 }
353 else {
354 Handle p (THREAD, JNIHandles::resolve(obj));
355 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
356 ObjectLocker ol(p, THREAD);
357 *addr = x;
358 }
359 }
360 UNSAFE_END
361
362 #endif // not SUPPORTS_NATIVE_CX8
363
364 #define DEFINE_GETSETOOP(jboolean, Boolean) \
365 \
366 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
367 UnsafeWrapper("Unsafe_Get"#Boolean); \
368 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
369 GET_FIELD(obj, offset, jboolean, v); \
370 return v; \
371 UNSAFE_END \
372 \
373 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
374 UnsafeWrapper("Unsafe_Set"#Boolean); \
375 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
376 SET_FIELD(obj, offset, jboolean, x); \
377 UNSAFE_END \
378 \
379 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
380 UnsafeWrapper("Unsafe_Get"#Boolean); \
381 GET_FIELD(obj, offset, jboolean, v); \
382 return v; \
383 UNSAFE_END \
384 \
385 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
386 UnsafeWrapper("Unsafe_Set"#Boolean); \
387 SET_FIELD(obj, offset, jboolean, x); \
388 UNSAFE_END \
389 \
390 // END DEFINE_GETSETOOP.
391
392 DEFINE_GETSETOOP(jboolean, Boolean)
393 DEFINE_GETSETOOP(jbyte, Byte)
394 DEFINE_GETSETOOP(jshort, Short);
395 DEFINE_GETSETOOP(jchar, Char);
396 DEFINE_GETSETOOP(jint, Int);
397 DEFINE_GETSETOOP(jlong, Long);
398 DEFINE_GETSETOOP(jfloat, Float);
399 DEFINE_GETSETOOP(jdouble, Double);
400
401 #undef DEFINE_GETSETOOP
402
403 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
404 \
405 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
406 UnsafeWrapper("Unsafe_Get"#Boolean); \
407 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
408 return v; \
409 UNSAFE_END \
410 \
411 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
412 UnsafeWrapper("Unsafe_Set"#Boolean); \
413 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
414 UNSAFE_END \
415 \
416 // END DEFINE_GETSETOOP_VOLATILE.
417
418 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
419 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
420 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
421 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
422 DEFINE_GETSETOOP_VOLATILE(jint, Int);
423 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
424 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
425
426 #ifdef SUPPORTS_NATIVE_CX8
427 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
428 #endif
429
430 #undef DEFINE_GETSETOOP_VOLATILE
431
432 // The non-intrinsified versions of setOrdered just use setVolatile
433
434 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
435 UnsafeWrapper("Unsafe_SetOrderedInt");
436 SET_FIELD_VOLATILE(obj, offset, jint, x);
437 UNSAFE_END
438
439 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
440 UnsafeWrapper("Unsafe_SetOrderedObject");
441 oop x = JNIHandles::resolve(x_h);
442 oop p = JNIHandles::resolve(obj);
443 void* addr = index_oop_from_field_offset_long(p, offset);
444 OrderAccess::release();
445 if (UseCompressedOops) {
446 oop_store((narrowOop*)addr, x);
447 } else {
448 oop_store((oop*)addr, x);
449 }
450 OrderAccess::fence();
451 UNSAFE_END
452
453 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
454 UnsafeWrapper("Unsafe_SetOrderedLong");
455 #ifdef SUPPORTS_NATIVE_CX8
456 SET_FIELD_VOLATILE(obj, offset, jlong, x);
457 #else
458 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
459 {
460 if (VM_Version::supports_cx8()) {
461 SET_FIELD_VOLATILE(obj, offset, jlong, x);
462 }
463 else {
464 Handle p (THREAD, JNIHandles::resolve(obj));
465 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
466 ObjectLocker ol(p, THREAD);
467 *addr = x;
468 }
469 }
470 #endif
471 UNSAFE_END
472
473 UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe))
474 UnsafeWrapper("Unsafe_LoadFence");
475 OrderAccess::acquire();
476 UNSAFE_END
477
478 UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe))
479 UnsafeWrapper("Unsafe_StoreFence");
480 OrderAccess::release();
481 UNSAFE_END
482
483 UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe))
484 UnsafeWrapper("Unsafe_FullFence");
485 OrderAccess::fence();
486 UNSAFE_END
487
488 ////// Data in the C heap.
489
490 // Note: These do not throw NullPointerException for bad pointers.
491 // They just crash. Only a oop base pointer can generate a NullPointerException.
492 //
493 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
494 \
495 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
496 UnsafeWrapper("Unsafe_GetNative"#Type); \
497 void* p = addr_from_java(addr); \
498 JavaThread* t = JavaThread::current(); \
499 t->set_doing_unsafe_access(true); \
500 java_type x = *(volatile native_type*)p; \
501 t->set_doing_unsafe_access(false); \
502 return x; \
503 UNSAFE_END \
504 \
505 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
506 UnsafeWrapper("Unsafe_SetNative"#Type); \
507 JavaThread* t = JavaThread::current(); \
508 t->set_doing_unsafe_access(true); \
509 void* p = addr_from_java(addr); \
510 *(volatile native_type*)p = x; \
511 t->set_doing_unsafe_access(false); \
512 UNSAFE_END \
513 \
514 // END DEFINE_GETSETNATIVE.
515
516 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
517 DEFINE_GETSETNATIVE(jshort, Short, signed short);
518 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
519 DEFINE_GETSETNATIVE(jint, Int, jint);
520 // no long -- handled specially
521 DEFINE_GETSETNATIVE(jfloat, Float, float);
522 DEFINE_GETSETNATIVE(jdouble, Double, double);
523
524 #undef DEFINE_GETSETNATIVE
525
526 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
527 UnsafeWrapper("Unsafe_GetNativeLong");
528 JavaThread* t = JavaThread::current();
529 // We do it this way to avoid problems with access to heap using 64
530 // bit loads, as jlong in heap could be not 64-bit aligned, and on
531 // some CPUs (SPARC) it leads to SIGBUS.
532 t->set_doing_unsafe_access(true);
533 void* p = addr_from_java(addr);
534 jlong x;
535 if (((intptr_t)p & 7) == 0) {
536 // jlong is aligned, do a volatile access
537 x = *(volatile jlong*)p;
538 } else {
539 jlong_accessor acc;
540 acc.words[0] = ((volatile jint*)p)[0];
541 acc.words[1] = ((volatile jint*)p)[1];
542 x = acc.long_value;
543 }
544 t->set_doing_unsafe_access(false);
545 return x;
546 UNSAFE_END
547
548 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
549 UnsafeWrapper("Unsafe_SetNativeLong");
550 JavaThread* t = JavaThread::current();
551 // see comment for Unsafe_GetNativeLong
552 t->set_doing_unsafe_access(true);
553 void* p = addr_from_java(addr);
554 if (((intptr_t)p & 7) == 0) {
555 // jlong is aligned, do a volatile access
556 *(volatile jlong*)p = x;
557 } else {
558 jlong_accessor acc;
559 acc.long_value = x;
560 ((volatile jint*)p)[0] = acc.words[0];
561 ((volatile jint*)p)[1] = acc.words[1];
562 }
563 t->set_doing_unsafe_access(false);
564 UNSAFE_END
565
566
567 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
568 UnsafeWrapper("Unsafe_GetNativeAddress");
569 void* p = addr_from_java(addr);
570 return addr_to_java(*(void**)p);
571 UNSAFE_END
572
573 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
574 UnsafeWrapper("Unsafe_SetNativeAddress");
575 void* p = addr_from_java(addr);
576 *(void**)p = addr_from_java(x);
577 UNSAFE_END
578
579
580 ////// Allocation requests
581
582 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
583 UnsafeWrapper("Unsafe_AllocateInstance");
584 {
585 ThreadToNativeFromVM ttnfv(thread);
586 return env->AllocObject(cls);
587 }
588 UNSAFE_END
589
590 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
591 UnsafeWrapper("Unsafe_AllocateMemory");
592 size_t sz = (size_t)size;
593 if (sz != (julong)size || size < 0) {
594 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
595 }
596 if (sz == 0) {
597 return 0;
598 }
599 sz = round_to(sz, HeapWordSize);
600 void* x = os::malloc(sz, mtInternal);
601 if (x == NULL) {
602 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
603 }
604 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
605 return addr_to_java(x);
606 UNSAFE_END
607
608 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
609 UnsafeWrapper("Unsafe_ReallocateMemory");
610 void* p = addr_from_java(addr);
611 size_t sz = (size_t)size;
612 if (sz != (julong)size || size < 0) {
613 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
614 }
615 if (sz == 0) {
616 os::free(p);
617 return 0;
618 }
619 sz = round_to(sz, HeapWordSize);
620 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal);
621 if (x == NULL) {
622 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
623 }
624 return addr_to_java(x);
625 UNSAFE_END
626
627 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
628 UnsafeWrapper("Unsafe_FreeMemory");
629 void* p = addr_from_java(addr);
630 if (p == NULL) {
631 return;
632 }
633 os::free(p);
634 UNSAFE_END
635
636 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
637 UnsafeWrapper("Unsafe_SetMemory");
638 size_t sz = (size_t)size;
639 if (sz != (julong)size || size < 0) {
640 THROW(vmSymbols::java_lang_IllegalArgumentException());
641 }
642 char* p = (char*) addr_from_java(addr);
643 Copy::fill_to_memory_atomic(p, sz, value);
644 UNSAFE_END
645
646 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
647 UnsafeWrapper("Unsafe_SetMemory");
648 size_t sz = (size_t)size;
649 if (sz != (julong)size || size < 0) {
650 THROW(vmSymbols::java_lang_IllegalArgumentException());
651 }
652 oop base = JNIHandles::resolve(obj);
653 void* p = index_oop_from_field_offset_long(base, offset);
654 Copy::fill_to_memory_atomic(p, sz, value);
655 UNSAFE_END
656
657 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
658 UnsafeWrapper("Unsafe_CopyMemory");
659 if (size == 0) {
660 return;
661 }
662 size_t sz = (size_t)size;
663 if (sz != (julong)size || size < 0) {
664 THROW(vmSymbols::java_lang_IllegalArgumentException());
665 }
666 void* src = addr_from_java(srcAddr);
667 void* dst = addr_from_java(dstAddr);
668 Copy::conjoint_memory_atomic(src, dst, sz);
669 UNSAFE_END
670
671 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
672 UnsafeWrapper("Unsafe_CopyMemory");
673 if (size == 0) {
674 return;
675 }
676 size_t sz = (size_t)size;
677 if (sz != (julong)size || size < 0) {
678 THROW(vmSymbols::java_lang_IllegalArgumentException());
679 }
680 oop srcp = JNIHandles::resolve(srcObj);
681 oop dstp = JNIHandles::resolve(dstObj);
682 if (dstp != NULL && !dstp->is_typeArray()) {
683 // NYI: This works only for non-oop arrays at present.
684 // Generalizing it would be reasonable, but requires card marking.
685 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
686 THROW(vmSymbols::java_lang_IllegalArgumentException());
687 }
688 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
689 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
690 Copy::conjoint_memory_atomic(src, dst, sz);
691 UNSAFE_END
692
693
694 ////// Random queries
695
696 // See comment at file start about UNSAFE_LEAF
697 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
698 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
699 UnsafeWrapper("Unsafe_AddressSize");
700 return sizeof(void*);
701 UNSAFE_END
702
703 // See comment at file start about UNSAFE_LEAF
704 //UNSAFE_LEAF(jint, Unsafe_PageSize())
705 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
706 UnsafeWrapper("Unsafe_PageSize");
707 return os::vm_page_size();
708 UNSAFE_END
709
710 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
711 if (field == NULL) {
712 THROW_0(vmSymbols::java_lang_NullPointerException());
713 }
714
715 oop reflected = JNIHandles::resolve_non_null(field);
716 oop mirror = java_lang_reflect_Field::clazz(reflected);
717 Klass* k = java_lang_Class::as_Klass(mirror);
718 int slot = java_lang_reflect_Field::slot(reflected);
719 int modifiers = java_lang_reflect_Field::modifiers(reflected);
720
721 if (must_be_static >= 0) {
722 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
723 if (must_be_static != really_is_static) {
724 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
725 }
726 }
727
728 int offset = InstanceKlass::cast(k)->field_offset(slot);
729 return field_offset_from_byte_offset(offset);
730 }
731
732 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
733 UnsafeWrapper("Unsafe_ObjectFieldOffset");
734 return find_field_offset(field, 0, THREAD);
735 UNSAFE_END
736
737 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
738 UnsafeWrapper("Unsafe_StaticFieldOffset");
739 return find_field_offset(field, 1, THREAD);
740 UNSAFE_END
741
742 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
743 UnsafeWrapper("Unsafe_StaticFieldBase");
744 // Note: In this VM implementation, a field address is always a short
745 // offset from the base of a a klass metaobject. Thus, the full dynamic
746 // range of the return type is never used. However, some implementations
747 // might put the static field inside an array shared by many classes,
748 // or even at a fixed address, in which case the address could be quite
749 // large. In that last case, this function would return NULL, since
750 // the address would operate alone, without any base pointer.
751
752 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
753
754 oop reflected = JNIHandles::resolve_non_null(field);
755 oop mirror = java_lang_reflect_Field::clazz(reflected);
756 int modifiers = java_lang_reflect_Field::modifiers(reflected);
757
758 if ((modifiers & JVM_ACC_STATIC) == 0) {
759 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
760 }
761
762 return JNIHandles::make_local(env, mirror);
763 UNSAFE_END
764
765 //@deprecated
766 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
767 UnsafeWrapper("Unsafe_FieldOffset");
768 // tries (but fails) to be polymorphic between static and non-static:
769 jlong offset = find_field_offset(field, -1, THREAD);
770 guarantee(offset == (jint)offset, "offset fits in 32 bits");
771 return (jint)offset;
772 UNSAFE_END
773
774 //@deprecated
775 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
776 UnsafeWrapper("Unsafe_StaticFieldBase");
777 if (clazz == NULL) {
778 THROW_0(vmSymbols::java_lang_NullPointerException());
779 }
780 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
781 UNSAFE_END
782
783 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
784 UnsafeWrapper("Unsafe_EnsureClassInitialized");
785 if (clazz == NULL) {
786 THROW(vmSymbols::java_lang_NullPointerException());
787 }
788 oop mirror = JNIHandles::resolve_non_null(clazz);
789
790 Klass* klass = java_lang_Class::as_Klass(mirror);
791 if (klass != NULL && klass->should_be_initialized()) {
792 InstanceKlass* k = InstanceKlass::cast(klass);
793 k->initialize(CHECK);
794 }
795 }
796 UNSAFE_END
797
798 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
799 UnsafeWrapper("Unsafe_ShouldBeInitialized");
800 if (clazz == NULL) {
801 THROW_(vmSymbols::java_lang_NullPointerException(), false);
802 }
803 oop mirror = JNIHandles::resolve_non_null(clazz);
804 Klass* klass = java_lang_Class::as_Klass(mirror);
805 if (klass != NULL && klass->should_be_initialized()) {
806 return true;
807 }
808 return false;
809 }
810 UNSAFE_END
811
812 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
813 if (acls == NULL) {
814 THROW(vmSymbols::java_lang_NullPointerException());
815 }
816 oop mirror = JNIHandles::resolve_non_null(acls);
817 Klass* k = java_lang_Class::as_Klass(mirror);
818 if (k == NULL || !k->oop_is_array()) {
819 THROW(vmSymbols::java_lang_InvalidClassException());
820 } else if (k->oop_is_objArray()) {
821 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
822 scale = heapOopSize;
823 } else if (k->oop_is_typeArray()) {
824 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
825 base = tak->array_header_in_bytes();
826 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
827 scale = (1 << tak->log2_element_size());
828 } else {
829 ShouldNotReachHere();
830 }
831 }
832
833 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
834 UnsafeWrapper("Unsafe_ArrayBaseOffset");
835 int base, scale;
836 getBaseAndScale(base, scale, acls, CHECK_0);
837 return field_offset_from_byte_offset(base);
838 UNSAFE_END
839
840
841 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
842 UnsafeWrapper("Unsafe_ArrayIndexScale");
843 int base, scale;
844 getBaseAndScale(base, scale, acls, CHECK_0);
845 // This VM packs both fields and array elements down to the byte.
846 // But watch out: If this changes, so that array references for
847 // a given primitive type (say, T_BOOLEAN) use different memory units
848 // than fields, this method MUST return zero for such arrays.
849 // For example, the VM used to store sub-word sized fields in full
850 // words in the object layout, so that accessors like getByte(Object,int)
851 // did not really do what one might expect for arrays. Therefore,
852 // this function used to report a zero scale factor, so that the user
853 // would know not to attempt to access sub-word array elements.
854 // // Code for unpacked fields:
855 // if (scale < wordSize) return 0;
856
857 // The following allows for a pretty general fieldOffset cookie scheme,
858 // but requires it to be linear in byte offset.
859 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
860 UNSAFE_END
861
862
863 static inline void throw_new(JNIEnv *env, const char *ename) {
864 char buf[100];
865 strcpy(buf, "java/lang/");
866 strcat(buf, ename);
867 jclass cls = env->FindClass(buf);
868 if (env->ExceptionCheck()) {
869 env->ExceptionClear();
870 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf);
871 return;
872 }
873 char* msg = NULL;
874 env->ThrowNew(cls, msg);
875 }
876
877 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
878 {
879 // Code lifted from JDK 1.3 ClassLoader.c
880
881 jbyte *body;
882 char *utfName;
883 jclass result = 0;
884 char buf[128];
885
886 if (UsePerfData) {
887 ClassLoader::unsafe_defineClassCallCounter()->inc();
888 }
889
890 if (data == NULL) {
891 throw_new(env, "NullPointerException");
892 return 0;
893 }
894
895 /* Work around 4153825. malloc crashes on Solaris when passed a
896 * negative size.
897 */
898 if (length < 0) {
899 throw_new(env, "ArrayIndexOutOfBoundsException");
900 return 0;
901 }
902
903 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
904
905 if (body == 0) {
906 throw_new(env, "OutOfMemoryError");
907 return 0;
908 }
909
910 env->GetByteArrayRegion(data, offset, length, body);
911
912 if (env->ExceptionOccurred())
913 goto free_body;
914
915 if (name != NULL) {
916 uint len = env->GetStringUTFLength(name);
917 int unicode_len = env->GetStringLength(name);
918 if (len >= sizeof(buf)) {
919 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
920 if (utfName == NULL) {
921 throw_new(env, "OutOfMemoryError");
922 goto free_body;
923 }
924 } else {
925 utfName = buf;
926 }
927 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
928 //VerifyFixClassname(utfName);
929 for (uint i = 0; i < len; i++) {
930 if (utfName[i] == '.') utfName[i] = '/';
931 }
932 } else {
933 utfName = NULL;
934 }
935
936 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
937
938 if (utfName && utfName != buf)
939 FREE_C_HEAP_ARRAY(char, utfName, mtInternal);
940
941 free_body:
942 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal);
943 return result;
944 }
945 }
946
947
948 UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
949 UnsafeWrapper("Unsafe_DefineClass");
950 {
951 ThreadToNativeFromVM ttnfv(thread);
952 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
953 }
954 UNSAFE_END
955
956 static jobject get_class_loader(JNIEnv* env, jclass cls) {
957 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
958 return NULL;
959 }
960 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
961 oop loader = k->class_loader();
962 return JNIHandles::make_local(env, loader);
963 }
964
965 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
966 UnsafeWrapper("Unsafe_DefineClass");
967 {
968 ThreadToNativeFromVM ttnfv(thread);
969
970 int depthFromDefineClass0 = 1;
971 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
972 jobject loader = (caller == NULL) ? NULL : get_class_loader(env, caller);
973 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
974
975 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
976 }
977 UNSAFE_END
978
979
980 #define DAC_Args CLS"[B["OBJ
981 // define a class but do not make it known to the class loader or system dictionary
982 // - host_class: supplies context for linkage, access control, protection domain, and class loader
983 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
984 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
985
986 // When you load an anonymous class U, it works as if you changed its name just before loading,
987 // to a name that you will never use again. Since the name is lost, no other class can directly
988 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
989 // through java.lang.Class methods like Class.newInstance.
990
991 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
992 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
993 // An anonymous class also has special privileges to access any member of its host class.
994 // This is the main reason why this loading operation is unsafe. The purpose of this is to
995 // allow language implementations to simulate "open classes"; a host class in effect gets
996 // new code when an anonymous class is loaded alongside it. A less convenient but more
997 // standard way to do this is with reflection, which can also be set to ignore access
998 // restrictions.
999
1000 // Access into an anonymous class is possible only through reflection. Therefore, there
1001 // are no special access rules for calling into an anonymous class. The relaxed access
1002 // rule for the host class is applied in the opposite direction: A host class reflectively
1003 // access one of its anonymous classes.
1004
1005 // If you load the same bytecodes twice, you get two different classes. You can reload
1006 // the same bytecodes with or without varying CP patches.
1007
1008 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
1009 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
1010 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
1011
1012 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
1013 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
1014 // It is not possible for a named class, or an older anonymous class, to refer by
1015 // name (via its CP) to a newer anonymous class.
1016
1017 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
1018 // or type descriptors used in the loaded anonymous class.
1019
1020 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
1021 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
1022 // be changed to println(greeting), where greeting is an arbitrary object created before
1023 // the anonymous class is loaded. This is useful in dynamic languages, in which
1024 // various kinds of metaobjects must be introduced as constants into bytecode.
1025 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
1026 // not just a literal string. For such ldc instructions, the verifier uses the
1027 // type Object instead of String, if the loaded constant is not in fact a String.
1028
1029 static instanceKlassHandle
1030 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
1031 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
1032 HeapWord* *temp_alloc,
1033 TRAPS) {
1034
1035 if (UsePerfData) {
1036 ClassLoader::unsafe_defineClassCallCounter()->inc();
1037 }
1038
1039 if (data == NULL) {
1040 THROW_0(vmSymbols::java_lang_NullPointerException());
1041 }
1042
1043 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
1044 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
1045 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal);
1046 if (body == NULL) {
1047 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1048 }
1049
1050 // caller responsible to free it:
1051 (*temp_alloc) = body;
1052
1053 {
1054 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1055 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1056 }
1057
1058 u1* class_bytes = (u1*) body;
1059 int class_bytes_length = (int) length;
1060 if (class_bytes_length < 0) class_bytes_length = 0;
1061 if (class_bytes == NULL
1062 || host_class == NULL
1063 || length != class_bytes_length)
1064 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1065
1066 objArrayHandle cp_patches_h;
1067 if (cp_patches_jh != NULL) {
1068 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1069 if (!p->is_objArray())
1070 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1071 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1072 }
1073
1074 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class)));
1075 const char* host_source = host_klass->external_name();
1076 Handle host_loader(THREAD, host_klass->class_loader());
1077 Handle host_domain(THREAD, host_klass->protection_domain());
1078
1079 GrowableArray<Handle>* cp_patches = NULL;
1080 if (cp_patches_h.not_null()) {
1081 int alen = cp_patches_h->length();
1082 for (int i = alen-1; i >= 0; i--) {
1083 oop p = cp_patches_h->obj_at(i);
1084 if (p != NULL) {
1085 Handle patch(THREAD, p);
1086 if (cp_patches == NULL)
1087 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1088 cp_patches->at_put(i, patch);
1089 }
1090 }
1091 }
1092
1093 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1094
1095 instanceKlassHandle anon_klass;
1096 {
1097 Symbol* no_class_name = NULL;
1098 Klass* anonk = SystemDictionary::parse_stream(no_class_name,
1099 host_loader, host_domain,
1100 &st, host_klass, cp_patches,
1101 CHECK_NULL);
1102 if (anonk == NULL) return NULL;
1103 anon_klass = instanceKlassHandle(THREAD, anonk);
1104 }
1105
1106 return anon_klass;
1107 }
1108
1109 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1110 {
1111 instanceKlassHandle anon_klass;
1112 jobject res_jh = NULL;
1113
1114 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1115 ResourceMark rm(THREAD);
1116
1117 HeapWord* temp_alloc = NULL;
1118
1119 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data,
1120 cp_patches_jh,
1121 &temp_alloc, THREAD);
1122 if (anon_klass() != NULL)
1123 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
1124
1125 // try/finally clause:
1126 if (temp_alloc != NULL) {
1127 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal);
1128 }
1129
1130 // The anonymous class loader data has been artificially been kept alive to
1131 // this point. The mirror and any instances of this class have to keep
1132 // it alive afterwards.
1133 if (anon_klass() != NULL) {
1134 anon_klass->class_loader_data()->set_keep_alive(false);
1135 }
1136
1137 // let caller initialize it as needed...
1138
1139 return (jclass) res_jh;
1140 }
1141 UNSAFE_END
1142
1143
1144
1145 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1146 UnsafeWrapper("Unsafe_MonitorEnter");
1147 {
1148 if (jobj == NULL) {
1149 THROW(vmSymbols::java_lang_NullPointerException());
1150 }
1151 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1152 ObjectSynchronizer::jni_enter(obj, CHECK);
1153 }
1154 UNSAFE_END
1155
1156
1157 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1158 UnsafeWrapper("Unsafe_TryMonitorEnter");
1159 {
1160 if (jobj == NULL) {
1161 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1162 }
1163 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1164 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1165 return (res ? JNI_TRUE : JNI_FALSE);
1166 }
1167 UNSAFE_END
1168
1169
1170 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1171 UnsafeWrapper("Unsafe_MonitorExit");
1172 {
1173 if (jobj == NULL) {
1174 THROW(vmSymbols::java_lang_NullPointerException());
1175 }
1176 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1177 ObjectSynchronizer::jni_exit(obj(), CHECK);
1178 }
1179 UNSAFE_END
1180
1181
1182 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1183 UnsafeWrapper("Unsafe_ThrowException");
1184 {
1185 ThreadToNativeFromVM ttnfv(thread);
1186 env->Throw(thr);
1187 }
1188 UNSAFE_END
1189
1190 // JSR166 ------------------------------------------------------------------
1191
1192 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1193 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1194 oop x = JNIHandles::resolve(x_h);
1195 oop e = JNIHandles::resolve(e_h);
1196 oop p = JNIHandles::resolve(obj);
1197 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1198 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
1199 jboolean success = (res == e);
1200 if (success)
1201 update_barrier_set((void*)addr, x);
1202 return success;
1203 UNSAFE_END
1204
1205 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1206 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1207 oop p = JNIHandles::resolve(obj);
1208 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1209 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1210 UNSAFE_END
1211
1212 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1213 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1214 Handle p (THREAD, JNIHandles::resolve(obj));
1215 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1216 if (VM_Version::supports_cx8())
1217 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1218 else {
1219 jboolean success = false;
1220 ObjectLocker ol(p, THREAD);
1221 if (*addr == e) { *addr = x; success = true; }
1222 return success;
1223 }
1224 UNSAFE_END
1225
1226 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1227 UnsafeWrapper("Unsafe_Park");
1228 EventThreadPark event;
1229 #ifndef USDT2
1230 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1231 #else /* USDT2 */
1232 HOTSPOT_THREAD_PARK_BEGIN(
1233 (uintptr_t) thread->parker(), (int) isAbsolute, time);
1234 #endif /* USDT2 */
1235 JavaThreadParkedState jtps(thread, time != 0);
1236 thread->parker()->park(isAbsolute != 0, time);
1237 #ifndef USDT2
1238 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1239 #else /* USDT2 */
1240 HOTSPOT_THREAD_PARK_END(
1241 (uintptr_t) thread->parker());
1242 #endif /* USDT2 */
1243 if (event.should_commit()) {
1244 oop obj = thread->current_park_blocker();
1245 event.set_klass((obj != NULL) ? obj->klass() : NULL);
1246 event.set_timeout(time);
1247 event.set_address((obj != NULL) ? (TYPE_ADDRESS) cast_from_oop<uintptr_t>(obj) : 0);
1248 event.commit();
1249 }
1250 UNSAFE_END
1251
1252 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1253 UnsafeWrapper("Unsafe_Unpark");
1254 Parker* p = NULL;
1255 if (jthread != NULL) {
1256 oop java_thread = JNIHandles::resolve_non_null(jthread);
1257 if (java_thread != NULL) {
1258 jlong lp = java_lang_Thread::park_event(java_thread);
1259 if (lp != 0) {
1260 // This cast is OK even though the jlong might have been read
1261 // non-atomically on 32bit systems, since there, one word will
1262 // always be zero anyway and the value set is always the same
1263 p = (Parker*)addr_from_java(lp);
1264 } else {
1265 // Grab lock if apparently null or using older version of library
1266 MutexLocker mu(Threads_lock);
1267 java_thread = JNIHandles::resolve_non_null(jthread);
1268 if (java_thread != NULL) {
1269 JavaThread* thr = java_lang_Thread::thread(java_thread);
1270 if (thr != NULL) {
1271 p = thr->parker();
1272 if (p != NULL) { // Bind to Java thread for next time.
1273 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1274 }
1275 }
1276 }
1277 }
1278 }
1279 }
1280 if (p != NULL) {
1281 #ifndef USDT2
1282 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1283 #else /* USDT2 */
1284 HOTSPOT_THREAD_UNPARK(
1285 (uintptr_t) p);
1286 #endif /* USDT2 */
1287 p->unpark();
1288 }
1289 UNSAFE_END
1290
1291 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1292 UnsafeWrapper("Unsafe_Loadavg");
1293 const int max_nelem = 3;
1294 double la[max_nelem];
1295 jint ret;
1296
1297 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1298 assert(a->is_typeArray(), "must be type array");
1299
1300 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1301 ThreadToNativeFromVM ttnfv(thread);
1302 throw_new(env, "ArrayIndexOutOfBoundsException");
1303 return -1;
1304 }
1305
1306 ret = os::loadavg(la, nelem);
1307 if (ret == -1) return -1;
1308
1309 // if successful, ret is the number of samples actually retrieved.
1310 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1311 switch(ret) {
1312 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1313 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1314 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1315 }
1316 return ret;
1317 UNSAFE_END
1318
1319 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1320 UnsafeWrapper("Unsafe_PrefetchRead");
1321 oop p = JNIHandles::resolve(obj);
1322 void* addr = index_oop_from_field_offset_long(p, 0);
1323 Prefetch::read(addr, (intx)offset);
1324 UNSAFE_END
1325
1326 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1327 UnsafeWrapper("Unsafe_PrefetchWrite");
1328 oop p = JNIHandles::resolve(obj);
1329 void* addr = index_oop_from_field_offset_long(p, 0);
1330 Prefetch::write(addr, (intx)offset);
1331 UNSAFE_END
1332
1333
1334 /// JVM_RegisterUnsafeMethods
1335
1336 #define ADR "J"
1337
1338 #define LANG "Ljava/lang/"
1339
1340 #define OBJ LANG"Object;"
1341 #define CLS LANG"Class;"
1342 #define CTR LANG"reflect/Constructor;"
1343 #define FLD LANG"reflect/Field;"
1344 #define MTH LANG"reflect/Method;"
1345 #define THR LANG"Throwable;"
1346
1347 #define DC0_Args LANG"String;[BII"
1348 #define DC_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1349
1350 #define CC (char*) /*cast a literal from (const char*)*/
1351 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1352
1353 // define deprecated accessors for compabitility with 1.4.0
1354 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1355 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1356 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1357
1358 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1359 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1360 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1361 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1362
1363 // Note: In 1.5.0, there are volatile versions too
1364 #define DECLARE_GETSETOOP(Boolean, Z) \
1365 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1366 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1367 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1368 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1369
1370
1371 #define DECLARE_GETSETNATIVE(Byte, B) \
1372 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1373 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1374
1375
1376
1377 // These are the methods for 1.4.0
1378 static JNINativeMethod methods_140[] = {
1379 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)},
1380 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)},
1381
1382 DECLARE_GETSETOOP_140(Boolean, Z),
1383 DECLARE_GETSETOOP_140(Byte, B),
1384 DECLARE_GETSETOOP_140(Short, S),
1385 DECLARE_GETSETOOP_140(Char, C),
1386 DECLARE_GETSETOOP_140(Int, I),
1387 DECLARE_GETSETOOP_140(Long, J),
1388 DECLARE_GETSETOOP_140(Float, F),
1389 DECLARE_GETSETOOP_140(Double, D),
1390
1391 DECLARE_GETSETNATIVE(Byte, B),
1392 DECLARE_GETSETNATIVE(Short, S),
1393 DECLARE_GETSETNATIVE(Char, C),
1394 DECLARE_GETSETNATIVE(Int, I),
1395 DECLARE_GETSETNATIVE(Long, J),
1396 DECLARE_GETSETNATIVE(Float, F),
1397 DECLARE_GETSETNATIVE(Double, D),
1398
1399 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1400 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1401
1402 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1403 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1404 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1405
1406 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)},
1407 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)},
1408 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1409 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1410 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1411 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1412 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1413
1414 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1415 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1416 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1417 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1418 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1419 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1420 };
1421
1422 // These are the methods prior to the JSR 166 changes in 1.5.0
1423 static JNINativeMethod methods_141[] = {
1424 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1425 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1426
1427 DECLARE_GETSETOOP_141(Boolean, Z),
1428 DECLARE_GETSETOOP_141(Byte, B),
1429 DECLARE_GETSETOOP_141(Short, S),
1430 DECLARE_GETSETOOP_141(Char, C),
1431 DECLARE_GETSETOOP_141(Int, I),
1432 DECLARE_GETSETOOP_141(Long, J),
1433 DECLARE_GETSETOOP_141(Float, F),
1434 DECLARE_GETSETOOP_141(Double, D),
1435
1436 DECLARE_GETSETNATIVE(Byte, B),
1437 DECLARE_GETSETNATIVE(Short, S),
1438 DECLARE_GETSETNATIVE(Char, C),
1439 DECLARE_GETSETNATIVE(Int, I),
1440 DECLARE_GETSETNATIVE(Long, J),
1441 DECLARE_GETSETNATIVE(Float, F),
1442 DECLARE_GETSETNATIVE(Double, D),
1443
1444 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1445 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1446
1447 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1448 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1449 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1450
1451 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1452 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1453 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1454 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1455 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1456 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1457 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1458 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1459
1460 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1461 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1462 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1463 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1464 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1465 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1466
1467 };
1468
1469 // These are the methods prior to the JSR 166 changes in 1.6.0
1470 static JNINativeMethod methods_15[] = {
1471 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1472 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1473 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1474 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1475
1476
1477 DECLARE_GETSETOOP(Boolean, Z),
1478 DECLARE_GETSETOOP(Byte, B),
1479 DECLARE_GETSETOOP(Short, S),
1480 DECLARE_GETSETOOP(Char, C),
1481 DECLARE_GETSETOOP(Int, I),
1482 DECLARE_GETSETOOP(Long, J),
1483 DECLARE_GETSETOOP(Float, F),
1484 DECLARE_GETSETOOP(Double, D),
1485
1486 DECLARE_GETSETNATIVE(Byte, B),
1487 DECLARE_GETSETNATIVE(Short, S),
1488 DECLARE_GETSETNATIVE(Char, C),
1489 DECLARE_GETSETNATIVE(Int, I),
1490 DECLARE_GETSETNATIVE(Long, J),
1491 DECLARE_GETSETNATIVE(Float, F),
1492 DECLARE_GETSETNATIVE(Double, D),
1493
1494 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1495 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1496
1497 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1498 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1499 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1500
1501 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1502 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1503 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1504 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1505 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1506 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1507 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1508 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1509
1510 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1511 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1512 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1513 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1514 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1515 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1516 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1517 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1518 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1519 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1520 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1521
1522 };
1523
1524 // These are the methods for 1.6.0 and 1.7.0
1525 static JNINativeMethod methods_16[] = {
1526 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1527 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1528 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1529 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1530
1531 DECLARE_GETSETOOP(Boolean, Z),
1532 DECLARE_GETSETOOP(Byte, B),
1533 DECLARE_GETSETOOP(Short, S),
1534 DECLARE_GETSETOOP(Char, C),
1535 DECLARE_GETSETOOP(Int, I),
1536 DECLARE_GETSETOOP(Long, J),
1537 DECLARE_GETSETOOP(Float, F),
1538 DECLARE_GETSETOOP(Double, D),
1539
1540 DECLARE_GETSETNATIVE(Byte, B),
1541 DECLARE_GETSETNATIVE(Short, S),
1542 DECLARE_GETSETNATIVE(Char, C),
1543 DECLARE_GETSETNATIVE(Int, I),
1544 DECLARE_GETSETNATIVE(Long, J),
1545 DECLARE_GETSETNATIVE(Float, F),
1546 DECLARE_GETSETNATIVE(Double, D),
1547
1548 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1549 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1550
1551 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1552 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1553 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1554
1555 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1556 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1557 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1558 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1559 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1560 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1561 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1562 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1563
1564 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1565 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1566 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1567 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1568 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1569 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1570 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1571 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1572 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1573 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1574 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1575 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1576 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1577 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1578 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1579 };
1580
1581 // These are the methods for 1.8.0
1582 static JNINativeMethod methods_18[] = {
1583 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1584 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1585 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1586 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1587
1588 DECLARE_GETSETOOP(Boolean, Z),
1589 DECLARE_GETSETOOP(Byte, B),
1590 DECLARE_GETSETOOP(Short, S),
1591 DECLARE_GETSETOOP(Char, C),
1592 DECLARE_GETSETOOP(Int, I),
1593 DECLARE_GETSETOOP(Long, J),
1594 DECLARE_GETSETOOP(Float, F),
1595 DECLARE_GETSETOOP(Double, D),
1596
1597 DECLARE_GETSETNATIVE(Byte, B),
1598 DECLARE_GETSETNATIVE(Short, S),
1599 DECLARE_GETSETNATIVE(Char, C),
1600 DECLARE_GETSETNATIVE(Int, I),
1601 DECLARE_GETSETNATIVE(Long, J),
1602 DECLARE_GETSETNATIVE(Float, F),
1603 DECLARE_GETSETNATIVE(Double, D),
1604
1605 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1606 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1607
1608 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1609 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1610 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1611
1612 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1613 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1614 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1615 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1616 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1617 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1618 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1619 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1620
1621 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1622 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1623 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1624 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1625 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1626 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1627 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1628 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1629 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1630 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1631 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1632 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1633 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1634 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1635 };
1636
1637 JNINativeMethod loadavg_method[] = {
1638 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1639 };
1640
1641 JNINativeMethod prefetch_methods[] = {
1642 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1643 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1644 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1645 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1646 };
1647
1648 JNINativeMethod memcopy_methods_17[] = {
1649 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1650 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1651 };
1652
1653 JNINativeMethod memcopy_methods_15[] = {
1654 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1655 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1656 };
1657
1658 JNINativeMethod anonk_methods[] = {
1659 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1660 };
1661
1662 JNINativeMethod lform_methods[] = {
1663 {CC"shouldBeInitialized",CC"("CLS")Z", FN_PTR(Unsafe_ShouldBeInitialized)},
1664 };
1665
1666 JNINativeMethod fence_methods[] = {
1667 {CC"loadFence", CC"()V", FN_PTR(Unsafe_LoadFence)},
1668 {CC"storeFence", CC"()V", FN_PTR(Unsafe_StoreFence)},
1669 {CC"fullFence", CC"()V", FN_PTR(Unsafe_FullFence)},
1670 };
1671
1672 #undef CC
1673 #undef FN_PTR
1674
1675 #undef ADR
1676 #undef LANG
1677 #undef OBJ
1678 #undef CLS
1679 #undef CTR
1680 #undef FLD
1681 #undef MTH
1682 #undef THR
1683 #undef DC0_Args
1684 #undef DC_Args
1685
1686 #undef DECLARE_GETSETOOP
1687 #undef DECLARE_GETSETNATIVE
1688
1689
1690 /**
1691 * Helper method to register native methods.
1692 */
1693 static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1694 int status = env->RegisterNatives(clazz, methods, nMethods);
1695 if (status < 0 || env->ExceptionOccurred()) {
1696 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1697 tty->print_cr("Unsafe: failed registering %s", message);
1698 }
1699 env->ExceptionClear();
1700 return false;
1701 } else {
1702 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1703 tty->print_cr("Unsafe: successfully registered %s", message);
1704 }
1705 return true;
1706 }
1707 }
1708
1709
1710 // This one function is exported, used by NativeLookup.
1711 // The Unsafe_xxx functions above are called only from the interpreter.
1712 // The optimizer looks at names and signatures to recognize
1713 // individual functions.
1714
1715 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1716 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1717 {
1718 ThreadToNativeFromVM ttnfv(thread);
1719
1720 // Unsafe methods
1721 {
1722 bool success = false;
1723 // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6
1724 if (!success) {
1725 success = register_natives("1.6 methods", env, unsafecls, methods_16, sizeof(methods_16)/sizeof(JNINativeMethod));
1726 }
1727 if (!success) {
1728 success = register_natives("1.8 methods", env, unsafecls, methods_18, sizeof(methods_18)/sizeof(JNINativeMethod));
1729 }
1730 if (!success) {
1731 success = register_natives("1.5 methods", env, unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1732 }
1733 if (!success) {
1734 success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1735 }
1736 if (!success) {
1737 success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1738 }
1739 guarantee(success, "register unsafe natives");
1740 }
1741
1742 // Unsafe.getLoadAverage
1743 register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1744
1745 // Prefetch methods
1746 register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1747
1748 // Memory copy methods
1749 {
1750 bool success = false;
1751 if (!success) {
1752 success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod));
1753 }
1754 if (!success) {
1755 success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1756 }
1757 }
1758
1759 // Unsafe.defineAnonymousClass
1760 if (EnableInvokeDynamic) {
1761 register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1762 }
1763
1764 // Unsafe.shouldBeInitialized
1765 if (EnableInvokeDynamic) {
1766 register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod));
1767 }
1768
1769 // Fence methods
1770 register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod));
1771 }
1772 JVM_END