1 /*
2 * Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/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 "jfr/jfrEvents.hpp"
32 #include "memory/allocation.inline.hpp"
33 #include "prims/jni.h"
34 #include "prims/jvm.h"
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 "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 truncate_jboolean(x) ((x) & 1)
160 #define truncate_jbyte(x) (x)
161 #define truncate_jshort(x) (x)
162 #define truncate_jchar(x) (x)
163 #define truncate_jint(x) (x)
164 #define truncate_jlong(x) (x)
165 #define truncate_jfloat(x) (x)
166 #define truncate_jdouble(x) (x)
167
168 #define GET_FIELD(obj, offset, type_name, v) \
169 oop p = JNIHandles::resolve(obj); \
170 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
171
172 #define SET_FIELD(obj, offset, type_name, x) \
173 oop p = JNIHandles::resolve(obj); \
174 *(type_name*)index_oop_from_field_offset_long(p, offset) = truncate_##type_name(x)
175
176 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
177 oop p = JNIHandles::resolve(obj); \
178 if (support_IRIW_for_not_multiple_copy_atomic_cpu) { \
179 OrderAccess::fence(); \
180 } \
181 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
182
183 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
184 oop p = JNIHandles::resolve(obj); \
185 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), truncate_##type_name(x));
186
187 // Macros for oops that check UseCompressedOops
188
189 #define GET_OOP_FIELD(obj, offset, v) \
190 oop p = JNIHandles::resolve(obj); \
191 oop v; \
192 if (UseCompressedOops) { \
193 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
194 v = oopDesc::decode_heap_oop(n); \
195 } else { \
196 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
197 }
198
199
200 // Get/SetObject must be special-cased, since it works with handles.
201
202 // We could be accessing the referent field in a reference
203 // object. If G1 is enabled then we need to register non-null
204 // referent with the SATB barrier.
205
206 #if INCLUDE_ALL_GCS
207 static bool is_java_lang_ref_Reference_access(oop o, jlong offset) {
208 if (offset == java_lang_ref_Reference::referent_offset && o != NULL) {
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 return true;
213 }
214 }
215 return false;
216 }
217 #endif
218
219 static void ensure_satb_referent_alive(oop o, jlong offset, oop v) {
220 #if INCLUDE_ALL_GCS
221 if (UseG1GC && v != NULL && is_java_lang_ref_Reference_access(o, offset)) {
222 G1SATBCardTableModRefBS::enqueue(v);
223 }
224 #endif
225 }
226
227 // The xxx140 variants for backward compatibility do not allow a full-width offset.
228 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
229 UnsafeWrapper("Unsafe_GetObject");
230 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
231 GET_OOP_FIELD(obj, offset, v)
232
233 ensure_satb_referent_alive(p, offset, v);
234
235 return JNIHandles::make_local(env, v);
236 UNSAFE_END
237
238 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
239 UnsafeWrapper("Unsafe_SetObject");
240 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
241 oop x = JNIHandles::resolve(x_h);
242 //SET_FIELD(obj, offset, oop, x);
243 oop p = JNIHandles::resolve(obj);
244 if (UseCompressedOops) {
245 if (x != NULL) {
246 // If there is a heap base pointer, we are obliged to emit a store barrier.
247 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
248 } else {
249 narrowOop n = oopDesc::encode_heap_oop_not_null(x);
250 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
251 }
252 } else {
253 if (x != NULL) {
254 // If there is a heap base pointer, we are obliged to emit a store barrier.
255 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
256 } else {
257 *(oop*)index_oop_from_field_offset_long(p, offset) = x;
258 }
259 }
260 UNSAFE_END
261
262 // The normal variants allow a null base pointer with an arbitrary address.
263 // But if the base pointer is non-null, the offset should make some sense.
264 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
265 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
266 UnsafeWrapper("Unsafe_GetObject");
267 GET_OOP_FIELD(obj, offset, v)
268
269 ensure_satb_referent_alive(p, offset, v);
270
271 return JNIHandles::make_local(env, v);
272 UNSAFE_END
273
274 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
275 UnsafeWrapper("Unsafe_SetObject");
276 oop x = JNIHandles::resolve(x_h);
277 oop p = JNIHandles::resolve(obj);
278 if (UseCompressedOops) {
279 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
280 } else {
281 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
282 }
283 UNSAFE_END
284
285 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
286 UnsafeWrapper("Unsafe_GetObjectVolatile");
287 oop p = JNIHandles::resolve(obj);
288 void* addr = index_oop_from_field_offset_long(p, offset);
289 volatile oop v;
290 if (UseCompressedOops) {
291 volatile narrowOop n = *(volatile narrowOop*) addr;
292 (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n));
293 } else {
294 (void)const_cast<oop&>(v = *(volatile oop*) addr);
295 }
296
297 ensure_satb_referent_alive(p, offset, v);
298
299 OrderAccess::acquire();
300 return JNIHandles::make_local(env, v);
301 UNSAFE_END
302
303 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
304 UnsafeWrapper("Unsafe_SetObjectVolatile");
305 oop x = JNIHandles::resolve(x_h);
306 oop p = JNIHandles::resolve(obj);
307 void* addr = index_oop_from_field_offset_long(p, offset);
308 OrderAccess::release();
309 if (UseCompressedOops) {
310 oop_store((narrowOop*)addr, x);
311 } else {
312 oop_store((oop*)addr, x);
313 }
314 OrderAccess::fence();
315 UNSAFE_END
316
317 #ifndef SUPPORTS_NATIVE_CX8
318
319 // VM_Version::supports_cx8() is a surrogate for 'supports atomic long memory ops'.
320 //
321 // On platforms which do not support atomic compare-and-swap of jlong (8 byte)
322 // values we have to use a lock-based scheme to enforce atomicity. This has to be
323 // applied to all Unsafe operations that set the value of a jlong field. Even so
324 // the compareAndSwapLong operation will not be atomic with respect to direct stores
325 // to the field from Java code. It is important therefore that any Java code that
326 // utilizes these Unsafe jlong operations does not perform direct stores. To permit
327 // direct loads of the field from Java code we must also use Atomic::store within the
328 // locked regions. And for good measure, in case there are direct stores, we also
329 // employ Atomic::load within those regions. Note that the field in question must be
330 // volatile and so must have atomic load/store accesses applied at the Java level.
331 //
332 // The locking scheme could utilize a range of strategies for controlling the locking
333 // granularity: from a lock per-field through to a single global lock. The latter is
334 // the simplest and is used for the current implementation. Note that the Java object
335 // that contains the field, can not, in general, be used for locking. To do so can lead
336 // to deadlocks as we may introduce locking into what appears to the Java code to be a
337 // lock-free path.
338 //
339 // As all the locked-regions are very short and themselves non-blocking we can treat
340 // them as leaf routines and elide safepoint checks (ie we don't perform any thread
341 // state transitions even when blocking for the lock). Note that if we do choose to
342 // add safepoint checks and thread state transitions, we must ensure that we calculate
343 // the address of the field _after_ we have acquired the lock, else the object may have
344 // been moved by the GC
345
346 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
347 UnsafeWrapper("Unsafe_GetLongVolatile");
348 {
349 if (VM_Version::supports_cx8()) {
350 GET_FIELD_VOLATILE(obj, offset, jlong, v);
351 return v;
352 }
353 else {
354 Handle p (THREAD, JNIHandles::resolve(obj));
355 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
356 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
357 jlong value = Atomic::load(addr);
358 return value;
359 }
360 }
361 UNSAFE_END
362
363 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
364 UnsafeWrapper("Unsafe_SetLongVolatile");
365 {
366 if (VM_Version::supports_cx8()) {
367 SET_FIELD_VOLATILE(obj, offset, jlong, x);
368 }
369 else {
370 Handle p (THREAD, JNIHandles::resolve(obj));
371 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
372 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
373 Atomic::store(x, addr);
374 }
375 }
376 UNSAFE_END
377
378 #endif // not SUPPORTS_NATIVE_CX8
379
380 #define DEFINE_GETSETOOP(jboolean, Boolean) \
381 \
382 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
383 UnsafeWrapper("Unsafe_Get"#Boolean); \
384 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
385 GET_FIELD(obj, offset, jboolean, v); \
386 return v; \
387 UNSAFE_END \
388 \
389 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
390 UnsafeWrapper("Unsafe_Set"#Boolean); \
391 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
392 SET_FIELD(obj, offset, jboolean, x); \
393 UNSAFE_END \
394 \
395 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
396 UnsafeWrapper("Unsafe_Get"#Boolean); \
397 GET_FIELD(obj, offset, jboolean, v); \
398 return v; \
399 UNSAFE_END \
400 \
401 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
402 UnsafeWrapper("Unsafe_Set"#Boolean); \
403 SET_FIELD(obj, offset, jboolean, x); \
404 UNSAFE_END \
405 \
406 // END DEFINE_GETSETOOP.
407
408 DEFINE_GETSETOOP(jboolean, Boolean)
409 DEFINE_GETSETOOP(jbyte, Byte)
410 DEFINE_GETSETOOP(jshort, Short);
411 DEFINE_GETSETOOP(jchar, Char);
412 DEFINE_GETSETOOP(jint, Int);
413 DEFINE_GETSETOOP(jlong, Long);
414 DEFINE_GETSETOOP(jfloat, Float);
415 DEFINE_GETSETOOP(jdouble, Double);
416
417 #undef DEFINE_GETSETOOP
418
419 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
420 \
421 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
422 UnsafeWrapper("Unsafe_Get"#Boolean); \
423 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
424 return v; \
425 UNSAFE_END \
426 \
427 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
428 UnsafeWrapper("Unsafe_Set"#Boolean); \
429 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
430 UNSAFE_END \
431 \
432 // END DEFINE_GETSETOOP_VOLATILE.
433
434 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
435 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
436 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
437 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
438 DEFINE_GETSETOOP_VOLATILE(jint, Int);
439 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
440 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
441
442 #ifdef SUPPORTS_NATIVE_CX8
443 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
444 #endif
445
446 #undef DEFINE_GETSETOOP_VOLATILE
447
448 // The non-intrinsified versions of setOrdered just use setVolatile
449
450 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
451 UnsafeWrapper("Unsafe_SetOrderedInt");
452 SET_FIELD_VOLATILE(obj, offset, jint, x);
453 UNSAFE_END
454
455 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
456 UnsafeWrapper("Unsafe_SetOrderedObject");
457 oop x = JNIHandles::resolve(x_h);
458 oop p = JNIHandles::resolve(obj);
459 void* addr = index_oop_from_field_offset_long(p, offset);
460 OrderAccess::release();
461 if (UseCompressedOops) {
462 oop_store((narrowOop*)addr, x);
463 } else {
464 oop_store((oop*)addr, x);
465 }
466 OrderAccess::fence();
467 UNSAFE_END
468
469 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
470 UnsafeWrapper("Unsafe_SetOrderedLong");
471 #ifdef SUPPORTS_NATIVE_CX8
472 SET_FIELD_VOLATILE(obj, offset, jlong, x);
473 #else
474 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
475 {
476 if (VM_Version::supports_cx8()) {
477 SET_FIELD_VOLATILE(obj, offset, jlong, x);
478 }
479 else {
480 Handle p (THREAD, JNIHandles::resolve(obj));
481 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
482 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
483 Atomic::store(x, addr);
484 }
485 }
486 #endif
487 UNSAFE_END
488
489 UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe))
490 UnsafeWrapper("Unsafe_LoadFence");
491 OrderAccess::acquire();
492 UNSAFE_END
493
494 UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe))
495 UnsafeWrapper("Unsafe_StoreFence");
496 OrderAccess::release();
497 UNSAFE_END
498
499 UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe))
500 UnsafeWrapper("Unsafe_FullFence");
501 OrderAccess::fence();
502 UNSAFE_END
503
504 ////// Data in the C heap.
505
506 // Note: These do not throw NullPointerException for bad pointers.
507 // They just crash. Only a oop base pointer can generate a NullPointerException.
508 //
509 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
510 \
511 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
512 UnsafeWrapper("Unsafe_GetNative"#Type); \
513 void* p = addr_from_java(addr); \
514 JavaThread* t = JavaThread::current(); \
515 t->set_doing_unsafe_access(true); \
516 java_type x = *(volatile native_type*)p; \
517 t->set_doing_unsafe_access(false); \
518 return x; \
519 UNSAFE_END \
520 \
521 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
522 UnsafeWrapper("Unsafe_SetNative"#Type); \
523 JavaThread* t = JavaThread::current(); \
524 t->set_doing_unsafe_access(true); \
525 void* p = addr_from_java(addr); \
526 *(volatile native_type*)p = x; \
527 t->set_doing_unsafe_access(false); \
528 UNSAFE_END \
529 \
530 // END DEFINE_GETSETNATIVE.
531
532 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
533 DEFINE_GETSETNATIVE(jshort, Short, signed short);
534 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
535 DEFINE_GETSETNATIVE(jint, Int, jint);
536 // no long -- handled specially
537 DEFINE_GETSETNATIVE(jfloat, Float, float);
538 DEFINE_GETSETNATIVE(jdouble, Double, double);
539
540 #undef DEFINE_GETSETNATIVE
541
542 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
543 UnsafeWrapper("Unsafe_GetNativeLong");
544 JavaThread* t = JavaThread::current();
545 // We do it this way to avoid problems with access to heap using 64
546 // bit loads, as jlong in heap could be not 64-bit aligned, and on
547 // some CPUs (SPARC) it leads to SIGBUS.
548 t->set_doing_unsafe_access(true);
549 void* p = addr_from_java(addr);
550 jlong x;
551 if (((intptr_t)p & 7) == 0) {
552 // jlong is aligned, do a volatile access
553 x = *(volatile jlong*)p;
554 } else {
555 jlong_accessor acc;
556 acc.words[0] = ((volatile jint*)p)[0];
557 acc.words[1] = ((volatile jint*)p)[1];
558 x = acc.long_value;
559 }
560 t->set_doing_unsafe_access(false);
561 return x;
562 UNSAFE_END
563
564 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
565 UnsafeWrapper("Unsafe_SetNativeLong");
566 JavaThread* t = JavaThread::current();
567 // see comment for Unsafe_GetNativeLong
568 t->set_doing_unsafe_access(true);
569 void* p = addr_from_java(addr);
570 if (((intptr_t)p & 7) == 0) {
571 // jlong is aligned, do a volatile access
572 *(volatile jlong*)p = x;
573 } else {
574 jlong_accessor acc;
575 acc.long_value = x;
576 ((volatile jint*)p)[0] = acc.words[0];
577 ((volatile jint*)p)[1] = acc.words[1];
578 }
579 t->set_doing_unsafe_access(false);
580 UNSAFE_END
581
582
583 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
584 UnsafeWrapper("Unsafe_GetNativeAddress");
585 void* p = addr_from_java(addr);
586 return addr_to_java(*(void**)p);
587 UNSAFE_END
588
589 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
590 UnsafeWrapper("Unsafe_SetNativeAddress");
591 void* p = addr_from_java(addr);
592 *(void**)p = addr_from_java(x);
593 UNSAFE_END
594
595
596 ////// Allocation requests
597
598 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
599 UnsafeWrapper("Unsafe_AllocateInstance");
600 {
601 ThreadToNativeFromVM ttnfv(thread);
602 return env->AllocObject(cls);
603 }
604 UNSAFE_END
605
606 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
607 UnsafeWrapper("Unsafe_AllocateMemory");
608 size_t sz = (size_t)size;
609 if (sz != (julong)size || size < 0) {
610 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
611 }
612 if (sz == 0) {
613 return 0;
614 }
615 sz = round_to(sz, HeapWordSize);
616 void* x = os::malloc(sz, mtInternal);
617 if (x == NULL) {
618 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
619 }
620 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
621 return addr_to_java(x);
622 UNSAFE_END
623
624 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
625 UnsafeWrapper("Unsafe_ReallocateMemory");
626 void* p = addr_from_java(addr);
627 size_t sz = (size_t)size;
628 if (sz != (julong)size || size < 0) {
629 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
630 }
631 if (sz == 0) {
632 os::free(p);
633 return 0;
634 }
635 sz = round_to(sz, HeapWordSize);
636 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal);
637 if (x == NULL) {
638 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
639 }
640 return addr_to_java(x);
641 UNSAFE_END
642
643 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
644 UnsafeWrapper("Unsafe_FreeMemory");
645 void* p = addr_from_java(addr);
646 if (p == NULL) {
647 return;
648 }
649 os::free(p);
650 UNSAFE_END
651
652 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
653 UnsafeWrapper("Unsafe_SetMemory");
654 size_t sz = (size_t)size;
655 if (sz != (julong)size || size < 0) {
656 THROW(vmSymbols::java_lang_IllegalArgumentException());
657 }
658 char* p = (char*) addr_from_java(addr);
659 Copy::fill_to_memory_atomic(p, sz, value);
660 UNSAFE_END
661
662 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
663 UnsafeWrapper("Unsafe_SetMemory");
664 size_t sz = (size_t)size;
665 if (sz != (julong)size || size < 0) {
666 THROW(vmSymbols::java_lang_IllegalArgumentException());
667 }
668 oop base = JNIHandles::resolve(obj);
669 void* p = index_oop_from_field_offset_long(base, offset);
670 Copy::fill_to_memory_atomic(p, sz, value);
671 UNSAFE_END
672
673 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
674 UnsafeWrapper("Unsafe_CopyMemory");
675 if (size == 0) {
676 return;
677 }
678 size_t sz = (size_t)size;
679 if (sz != (julong)size || size < 0) {
680 THROW(vmSymbols::java_lang_IllegalArgumentException());
681 }
682 void* src = addr_from_java(srcAddr);
683 void* dst = addr_from_java(dstAddr);
684 Copy::conjoint_memory_atomic(src, dst, sz);
685 UNSAFE_END
686
687 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
688 UnsafeWrapper("Unsafe_CopyMemory");
689 if (size == 0) {
690 return;
691 }
692 size_t sz = (size_t)size;
693 if (sz != (julong)size || size < 0) {
694 THROW(vmSymbols::java_lang_IllegalArgumentException());
695 }
696 oop srcp = JNIHandles::resolve(srcObj);
697 oop dstp = JNIHandles::resolve(dstObj);
698 if (dstp != NULL && !dstp->is_typeArray()) {
699 // NYI: This works only for non-oop arrays at present.
700 // Generalizing it would be reasonable, but requires card marking.
701 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
702 THROW(vmSymbols::java_lang_IllegalArgumentException());
703 }
704 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
705 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
706 Copy::conjoint_memory_atomic(src, dst, sz);
707 UNSAFE_END
708
709
710 ////// Random queries
711
712 // See comment at file start about UNSAFE_LEAF
713 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
714 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
715 UnsafeWrapper("Unsafe_AddressSize");
716 return sizeof(void*);
717 UNSAFE_END
718
719 // See comment at file start about UNSAFE_LEAF
720 //UNSAFE_LEAF(jint, Unsafe_PageSize())
721 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
722 UnsafeWrapper("Unsafe_PageSize");
723 return os::vm_page_size();
724 UNSAFE_END
725
726 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
727 if (field == NULL) {
728 THROW_0(vmSymbols::java_lang_NullPointerException());
729 }
730
731 oop reflected = JNIHandles::resolve_non_null(field);
732 oop mirror = java_lang_reflect_Field::clazz(reflected);
733 Klass* k = java_lang_Class::as_Klass(mirror);
734 int slot = java_lang_reflect_Field::slot(reflected);
735 int modifiers = java_lang_reflect_Field::modifiers(reflected);
736
737 if (must_be_static >= 0) {
738 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
739 if (must_be_static != really_is_static) {
740 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
741 }
742 }
743
744 int offset = InstanceKlass::cast(k)->field_offset(slot);
745 return field_offset_from_byte_offset(offset);
746 }
747
748 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
749 UnsafeWrapper("Unsafe_ObjectFieldOffset");
750 return find_field_offset(field, 0, THREAD);
751 UNSAFE_END
752
753 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
754 UnsafeWrapper("Unsafe_StaticFieldOffset");
755 return find_field_offset(field, 1, THREAD);
756 UNSAFE_END
757
758 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
759 UnsafeWrapper("Unsafe_StaticFieldBase");
760 // Note: In this VM implementation, a field address is always a short
761 // offset from the base of a a klass metaobject. Thus, the full dynamic
762 // range of the return type is never used. However, some implementations
763 // might put the static field inside an array shared by many classes,
764 // or even at a fixed address, in which case the address could be quite
765 // large. In that last case, this function would return NULL, since
766 // the address would operate alone, without any base pointer.
767
768 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
769
770 oop reflected = JNIHandles::resolve_non_null(field);
771 oop mirror = java_lang_reflect_Field::clazz(reflected);
772 int modifiers = java_lang_reflect_Field::modifiers(reflected);
773
774 if ((modifiers & JVM_ACC_STATIC) == 0) {
775 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
776 }
777
778 return JNIHandles::make_local(env, mirror);
779 UNSAFE_END
780
781 //@deprecated
782 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
783 UnsafeWrapper("Unsafe_FieldOffset");
784 // tries (but fails) to be polymorphic between static and non-static:
785 jlong offset = find_field_offset(field, -1, THREAD);
786 guarantee(offset == (jint)offset, "offset fits in 32 bits");
787 return (jint)offset;
788 UNSAFE_END
789
790 //@deprecated
791 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
792 UnsafeWrapper("Unsafe_StaticFieldBase");
793 if (clazz == NULL) {
794 THROW_0(vmSymbols::java_lang_NullPointerException());
795 }
796 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
797 UNSAFE_END
798
799 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
800 UnsafeWrapper("Unsafe_EnsureClassInitialized");
801 if (clazz == NULL) {
802 THROW(vmSymbols::java_lang_NullPointerException());
803 }
804 oop mirror = JNIHandles::resolve_non_null(clazz);
805
806 Klass* klass = java_lang_Class::as_Klass(mirror);
807 if (klass != NULL && klass->should_be_initialized()) {
808 InstanceKlass* k = InstanceKlass::cast(klass);
809 k->initialize(CHECK);
810 }
811 }
812 UNSAFE_END
813
814 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
815 UnsafeWrapper("Unsafe_ShouldBeInitialized");
816 if (clazz == NULL) {
817 THROW_(vmSymbols::java_lang_NullPointerException(), false);
818 }
819 oop mirror = JNIHandles::resolve_non_null(clazz);
820 Klass* klass = java_lang_Class::as_Klass(mirror);
821 if (klass != NULL && klass->should_be_initialized()) {
822 return true;
823 }
824 return false;
825 }
826 UNSAFE_END
827
828 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
829 if (acls == NULL) {
830 THROW(vmSymbols::java_lang_NullPointerException());
831 }
832 oop mirror = JNIHandles::resolve_non_null(acls);
833 Klass* k = java_lang_Class::as_Klass(mirror);
834 if (k == NULL || !k->oop_is_array()) {
835 THROW(vmSymbols::java_lang_InvalidClassException());
836 } else if (k->oop_is_objArray()) {
837 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
838 scale = heapOopSize;
839 } else if (k->oop_is_typeArray()) {
840 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
841 base = tak->array_header_in_bytes();
842 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
843 scale = (1 << tak->log2_element_size());
844 } else {
845 ShouldNotReachHere();
846 }
847 }
848
849 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
850 UnsafeWrapper("Unsafe_ArrayBaseOffset");
851 int base = 0, scale = 0;
852 getBaseAndScale(base, scale, acls, CHECK_0);
853 return field_offset_from_byte_offset(base);
854 UNSAFE_END
855
856
857 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
858 UnsafeWrapper("Unsafe_ArrayIndexScale");
859 int base = 0, scale = 0;
860 getBaseAndScale(base, scale, acls, CHECK_0);
861 // This VM packs both fields and array elements down to the byte.
862 // But watch out: If this changes, so that array references for
863 // a given primitive type (say, T_BOOLEAN) use different memory units
864 // than fields, this method MUST return zero for such arrays.
865 // For example, the VM used to store sub-word sized fields in full
866 // words in the object layout, so that accessors like getByte(Object,int)
867 // did not really do what one might expect for arrays. Therefore,
868 // this function used to report a zero scale factor, so that the user
869 // would know not to attempt to access sub-word array elements.
870 // // Code for unpacked fields:
871 // if (scale < wordSize) return 0;
872
873 // The following allows for a pretty general fieldOffset cookie scheme,
874 // but requires it to be linear in byte offset.
875 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
876 UNSAFE_END
877
878
879 static inline void throw_new(JNIEnv *env, const char *ename) {
880 char buf[100];
881 strcpy(buf, "java/lang/");
882 strcat(buf, ename);
883 jclass cls = env->FindClass(buf);
884 if (env->ExceptionCheck()) {
885 env->ExceptionClear();
886 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf);
887 return;
888 }
889 char* msg = NULL;
890 env->ThrowNew(cls, msg);
891 }
892
893 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
894 {
895 // Code lifted from JDK 1.3 ClassLoader.c
896
897 jbyte *body;
898 char *utfName;
899 jclass result = 0;
900 char buf[128];
901
902 if (UsePerfData) {
903 ClassLoader::unsafe_defineClassCallCounter()->inc();
904 }
905
906 if (data == NULL) {
907 throw_new(env, "NullPointerException");
908 return 0;
909 }
910
911 /* Work around 4153825. malloc crashes on Solaris when passed a
912 * negative size.
913 */
914 if (length < 0) {
915 throw_new(env, "ArrayIndexOutOfBoundsException");
916 return 0;
917 }
918
919 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
920
921 if (body == 0) {
922 throw_new(env, "OutOfMemoryError");
923 return 0;
924 }
925
926 env->GetByteArrayRegion(data, offset, length, body);
927
928 if (env->ExceptionOccurred())
929 goto free_body;
930
931 if (name != NULL) {
932 uint len = env->GetStringUTFLength(name);
933 int unicode_len = env->GetStringLength(name);
934 if (len >= sizeof(buf)) {
935 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
936 if (utfName == NULL) {
937 throw_new(env, "OutOfMemoryError");
938 goto free_body;
939 }
940 } else {
941 utfName = buf;
942 }
943 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
944 //VerifyFixClassname(utfName);
945 for (uint i = 0; i < len; i++) {
946 if (utfName[i] == '.') utfName[i] = '/';
947 }
948 } else {
949 utfName = NULL;
950 }
951
952 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
953
954 if (utfName && utfName != buf)
955 FREE_C_HEAP_ARRAY(char, utfName, mtInternal);
956
957 free_body:
958 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal);
959 return result;
960 }
961 }
962
963
964 UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
965 UnsafeWrapper("Unsafe_DefineClass");
966 {
967 ThreadToNativeFromVM ttnfv(thread);
968 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
969 }
970 UNSAFE_END
971
972
973 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
974 UnsafeWrapper("Unsafe_DefineClass");
975 {
976 ThreadToNativeFromVM ttnfv(thread);
977
978 int depthFromDefineClass0 = 1;
979 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
980 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
981 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
982
983 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
984 }
985 UNSAFE_END
986
987
988 #define DAC_Args CLS"[B["OBJ
989 // define a class but do not make it known to the class loader or system dictionary
990 // - host_class: supplies context for linkage, access control, protection domain, and class loader
991 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
992 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
993
994 // When you load an anonymous class U, it works as if you changed its name just before loading,
995 // to a name that you will never use again. Since the name is lost, no other class can directly
996 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
997 // through java.lang.Class methods like Class.newInstance.
998
999 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
1000 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
1001 // An anonymous class also has special privileges to access any member of its host class.
1002 // This is the main reason why this loading operation is unsafe. The purpose of this is to
1003 // allow language implementations to simulate "open classes"; a host class in effect gets
1004 // new code when an anonymous class is loaded alongside it. A less convenient but more
1005 // standard way to do this is with reflection, which can also be set to ignore access
1006 // restrictions.
1007
1008 // Access into an anonymous class is possible only through reflection. Therefore, there
1009 // are no special access rules for calling into an anonymous class. The relaxed access
1010 // rule for the host class is applied in the opposite direction: A host class reflectively
1011 // access one of its anonymous classes.
1012
1013 // If you load the same bytecodes twice, you get two different classes. You can reload
1014 // the same bytecodes with or without varying CP patches.
1015
1016 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
1017 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
1018 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
1019
1020 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
1021 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
1022 // It is not possible for a named class, or an older anonymous class, to refer by
1023 // name (via its CP) to a newer anonymous class.
1024
1025 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
1026 // or type descriptors used in the loaded anonymous class.
1027
1028 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
1029 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
1030 // be changed to println(greeting), where greeting is an arbitrary object created before
1031 // the anonymous class is loaded. This is useful in dynamic languages, in which
1032 // various kinds of metaobjects must be introduced as constants into bytecode.
1033 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
1034 // not just a literal string. For such ldc instructions, the verifier uses the
1035 // type Object instead of String, if the loaded constant is not in fact a String.
1036
1037 static instanceKlassHandle
1038 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
1039 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
1040 HeapWord* *temp_alloc,
1041 TRAPS) {
1042
1043 if (UsePerfData) {
1044 ClassLoader::unsafe_defineClassCallCounter()->inc();
1045 }
1046
1047 if (data == NULL) {
1048 THROW_0(vmSymbols::java_lang_NullPointerException());
1049 }
1050
1051 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
1052 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
1053 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal);
1054 if (body == NULL) {
1055 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1056 }
1057
1058 // caller responsible to free it:
1059 (*temp_alloc) = body;
1060
1061 {
1062 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1063 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1064 }
1065
1066 u1* class_bytes = (u1*) body;
1067 int class_bytes_length = (int) length;
1068 if (class_bytes_length < 0) class_bytes_length = 0;
1069 if (class_bytes == NULL
1070 || host_class == NULL
1071 || length != class_bytes_length)
1072 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1073
1074 objArrayHandle cp_patches_h;
1075 if (cp_patches_jh != NULL) {
1076 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1077 if (!p->is_objArray())
1078 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1079 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1080 }
1081
1082 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class)));
1083 const char* host_source = host_klass->external_name();
1084 Handle host_loader(THREAD, host_klass->class_loader());
1085 Handle host_domain(THREAD, host_klass->protection_domain());
1086
1087 GrowableArray<Handle>* cp_patches = NULL;
1088 if (cp_patches_h.not_null()) {
1089 int alen = cp_patches_h->length();
1090 for (int i = alen-1; i >= 0; i--) {
1091 oop p = cp_patches_h->obj_at(i);
1092 if (p != NULL) {
1093 Handle patch(THREAD, p);
1094 if (cp_patches == NULL)
1095 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1096 cp_patches->at_put(i, patch);
1097 }
1098 }
1099 }
1100
1101 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1102
1103 instanceKlassHandle anon_klass;
1104 {
1105 Symbol* no_class_name = NULL;
1106 Klass* anonk = SystemDictionary::parse_stream(no_class_name,
1107 host_loader, host_domain,
1108 &st, host_klass, cp_patches,
1109 CHECK_NULL);
1110 if (anonk == NULL) return NULL;
1111 anon_klass = instanceKlassHandle(THREAD, anonk);
1112 }
1113
1114 return anon_klass;
1115 }
1116
1117 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1118 {
1119 instanceKlassHandle anon_klass;
1120 jobject res_jh = NULL;
1121
1122 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1123 ResourceMark rm(THREAD);
1124
1125 HeapWord* temp_alloc = NULL;
1126
1127 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data,
1128 cp_patches_jh,
1129 &temp_alloc, THREAD);
1130 if (anon_klass() != NULL)
1131 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
1132
1133 // try/finally clause:
1134 if (temp_alloc != NULL) {
1135 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal);
1136 }
1137
1138 // The anonymous class loader data has been artificially been kept alive to
1139 // this point. The mirror and any instances of this class have to keep
1140 // it alive afterwards.
1141 if (anon_klass() != NULL) {
1142 anon_klass->class_loader_data()->set_keep_alive(false);
1143 }
1144
1145 // let caller initialize it as needed...
1146
1147 return (jclass) res_jh;
1148 }
1149 UNSAFE_END
1150
1151
1152
1153 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1154 UnsafeWrapper("Unsafe_MonitorEnter");
1155 {
1156 if (jobj == NULL) {
1157 THROW(vmSymbols::java_lang_NullPointerException());
1158 }
1159 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1160 ObjectSynchronizer::jni_enter(obj, CHECK);
1161 }
1162 UNSAFE_END
1163
1164
1165 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1166 UnsafeWrapper("Unsafe_TryMonitorEnter");
1167 {
1168 if (jobj == NULL) {
1169 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1170 }
1171 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1172 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1173 return (res ? JNI_TRUE : JNI_FALSE);
1174 }
1175 UNSAFE_END
1176
1177
1178 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1179 UnsafeWrapper("Unsafe_MonitorExit");
1180 {
1181 if (jobj == NULL) {
1182 THROW(vmSymbols::java_lang_NullPointerException());
1183 }
1184 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1185 ObjectSynchronizer::jni_exit(obj(), CHECK);
1186 }
1187 UNSAFE_END
1188
1189
1190 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1191 UnsafeWrapper("Unsafe_ThrowException");
1192 {
1193 ThreadToNativeFromVM ttnfv(thread);
1194 env->Throw(thr);
1195 }
1196 UNSAFE_END
1197
1198 // JSR166 ------------------------------------------------------------------
1199
1200 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1201 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1202 oop x = JNIHandles::resolve(x_h);
1203 oop e = JNIHandles::resolve(e_h);
1204 oop p = JNIHandles::resolve(obj);
1205 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1206 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
1207 jboolean success = (res == e);
1208 if (success)
1209 update_barrier_set((void*)addr, x);
1210 return success;
1211 UNSAFE_END
1212
1213 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1214 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1215 oop p = JNIHandles::resolve(obj);
1216 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1217 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1218 UNSAFE_END
1219
1220 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1221 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1222 Handle p (THREAD, JNIHandles::resolve(obj));
1223 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1224 #ifdef SUPPORTS_NATIVE_CX8
1225 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1226 #else
1227 if (VM_Version::supports_cx8())
1228 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1229 else {
1230 jboolean success = false;
1231 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
1232 jlong val = Atomic::load(addr);
1233 if (val == e) { Atomic::store(x, addr); success = true; }
1234 return success;
1235 }
1236 #endif
1237 UNSAFE_END
1238
1239 static void post_thread_park_event(EventThreadPark* event, const oop obj, jlong timeout) {
1240 assert(event != NULL, "invariant");
1241 assert(event->should_commit(), "invariant");
1242 event->set_parkedClass((obj != NULL) ? obj->klass() : NULL);
1243 event->set_timeout(timeout);
1244 event->set_address((obj != NULL) ? (u8)cast_from_oop<uintptr_t>(obj) : 0);
1245 event->commit();
1246 }
1247
1248 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1249 UnsafeWrapper("Unsafe_Park");
1250 EventThreadPark event;
1251 #ifndef USDT2
1252 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1253 #else /* USDT2 */
1254 HOTSPOT_THREAD_PARK_BEGIN(
1255 (uintptr_t) thread->parker(), (int) isAbsolute, time);
1256 #endif /* USDT2 */
1257 JavaThreadParkedState jtps(thread, time != 0);
1258 thread->parker()->park(isAbsolute != 0, time);
1259 #ifndef USDT2
1260 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1261 #else /* USDT2 */
1262 HOTSPOT_THREAD_PARK_END(
1263 (uintptr_t) thread->parker());
1264 #endif /* USDT2 */
1265 if (event.should_commit()) {
1266 post_thread_park_event(&event, thread->current_park_blocker(), time);
1267 }
1268 UNSAFE_END
1269
1270 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1271 UnsafeWrapper("Unsafe_Unpark");
1272 Parker* p = NULL;
1273 if (jthread != NULL) {
1274 oop java_thread = JNIHandles::resolve_non_null(jthread);
1275 if (java_thread != NULL) {
1276 jlong lp = java_lang_Thread::park_event(java_thread);
1277 if (lp != 0) {
1278 // This cast is OK even though the jlong might have been read
1279 // non-atomically on 32bit systems, since there, one word will
1280 // always be zero anyway and the value set is always the same
1281 p = (Parker*)addr_from_java(lp);
1282 } else {
1283 // Grab lock if apparently null or using older version of library
1284 MutexLocker mu(Threads_lock);
1285 java_thread = JNIHandles::resolve_non_null(jthread);
1286 if (java_thread != NULL) {
1287 JavaThread* thr = java_lang_Thread::thread(java_thread);
1288 if (thr != NULL) {
1289 p = thr->parker();
1290 if (p != NULL) { // Bind to Java thread for next time.
1291 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1292 }
1293 }
1294 }
1295 }
1296 }
1297 }
1298 if (p != NULL) {
1299 #ifndef USDT2
1300 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1301 #else /* USDT2 */
1302 HOTSPOT_THREAD_UNPARK(
1303 (uintptr_t) p);
1304 #endif /* USDT2 */
1305 p->unpark();
1306 }
1307 UNSAFE_END
1308
1309 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1310 UnsafeWrapper("Unsafe_Loadavg");
1311 const int max_nelem = 3;
1312 double la[max_nelem];
1313 jint ret;
1314
1315 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1316 assert(a->is_typeArray(), "must be type array");
1317
1318 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1319 ThreadToNativeFromVM ttnfv(thread);
1320 throw_new(env, "ArrayIndexOutOfBoundsException");
1321 return -1;
1322 }
1323
1324 ret = os::loadavg(la, nelem);
1325 if (ret == -1) return -1;
1326
1327 // if successful, ret is the number of samples actually retrieved.
1328 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1329 switch(ret) {
1330 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1331 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1332 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1333 }
1334 return ret;
1335 UNSAFE_END
1336
1337 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1338 UnsafeWrapper("Unsafe_PrefetchRead");
1339 oop p = JNIHandles::resolve(obj);
1340 void* addr = index_oop_from_field_offset_long(p, 0);
1341 Prefetch::read(addr, (intx)offset);
1342 UNSAFE_END
1343
1344 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1345 UnsafeWrapper("Unsafe_PrefetchWrite");
1346 oop p = JNIHandles::resolve(obj);
1347 void* addr = index_oop_from_field_offset_long(p, 0);
1348 Prefetch::write(addr, (intx)offset);
1349 UNSAFE_END
1350
1351
1352 /// JVM_RegisterUnsafeMethods
1353
1354 #define ADR "J"
1355
1356 #define LANG "Ljava/lang/"
1357
1358 #define OBJ LANG "Object;"
1359 #define CLS LANG "Class;"
1360 #define CTR LANG "reflect/Constructor;"
1361 #define FLD LANG "reflect/Field;"
1362 #define MTH LANG "reflect/Method;"
1363 #define THR LANG "Throwable;"
1364
1365 #define DC0_Args LANG "String;[BII"
1366 #define DC_Args DC0_Args LANG "ClassLoader;" "Ljava/security/ProtectionDomain;"
1367
1368 #define CC (char*) /*cast a literal from (const char*)*/
1369 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1370
1371 // define deprecated accessors for compabitility with 1.4.0
1372 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1373 {CC "get" #Boolean, CC "(" OBJ "I)" #Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1374 {CC "put" #Boolean, CC "(" OBJ "I" #Z ")V", FN_PTR(Unsafe_Set##Boolean##140)}
1375
1376 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1377 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1378 {CC "get" #Boolean, CC "(" OBJ "J)" #Z, FN_PTR(Unsafe_Get##Boolean)}, \
1379 {CC "put" #Boolean, CC "(" OBJ "J" #Z ")V", FN_PTR(Unsafe_Set##Boolean)}
1380
1381 // Note: In 1.5.0, there are volatile versions too
1382 #define DECLARE_GETSETOOP(Boolean, Z) \
1383 {CC "get" #Boolean, CC "(" OBJ "J)" #Z, FN_PTR(Unsafe_Get##Boolean)}, \
1384 {CC "put" #Boolean, CC "(" OBJ "J" #Z ")V", FN_PTR(Unsafe_Set##Boolean)}, \
1385 {CC "get" #Boolean "Volatile", CC "(" OBJ "J)" #Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1386 {CC "put" #Boolean "Volatile", CC "(" OBJ "J" #Z ")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1387
1388
1389 #define DECLARE_GETSETNATIVE(Byte, B) \
1390 {CC "get" #Byte, CC "(" ADR ")" #B, FN_PTR(Unsafe_GetNative##Byte)}, \
1391 {CC "put" #Byte, CC "(" ADR#B ")V", FN_PTR(Unsafe_SetNative##Byte)}
1392
1393
1394
1395 // These are the methods for 1.4.0
1396 static JNINativeMethod methods_140[] = {
1397 {CC "getObject", CC "(" OBJ "I)" OBJ "", FN_PTR(Unsafe_GetObject140)},
1398 {CC "putObject", CC "(" OBJ "I" OBJ ")V", FN_PTR(Unsafe_SetObject140)},
1399
1400 DECLARE_GETSETOOP_140(Boolean, Z),
1401 DECLARE_GETSETOOP_140(Byte, B),
1402 DECLARE_GETSETOOP_140(Short, S),
1403 DECLARE_GETSETOOP_140(Char, C),
1404 DECLARE_GETSETOOP_140(Int, I),
1405 DECLARE_GETSETOOP_140(Long, J),
1406 DECLARE_GETSETOOP_140(Float, F),
1407 DECLARE_GETSETOOP_140(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 "fieldOffset", CC "(" FLD ")I", FN_PTR(Unsafe_FieldOffset)},
1425 {CC "staticFieldBase", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)},
1426 {CC "ensureClassInitialized",CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1427 {CC "arrayBaseOffset", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1428 {CC "arrayIndexScale", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale)},
1429 {CC "addressSize", CC "()I", FN_PTR(Unsafe_AddressSize)},
1430 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1431
1432 {CC "defineClass", CC "(" DC0_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)},
1433 {CC "defineClass", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass)},
1434 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1435 {CC "monitorEnter", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorEnter)},
1436 {CC "monitorExit", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorExit)},
1437 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)}
1438 };
1439
1440 // These are the methods prior to the JSR 166 changes in 1.5.0
1441 static JNINativeMethod methods_141[] = {
1442 {CC "getObject", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObject)},
1443 {CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObject)},
1444
1445 DECLARE_GETSETOOP_141(Boolean, Z),
1446 DECLARE_GETSETOOP_141(Byte, B),
1447 DECLARE_GETSETOOP_141(Short, S),
1448 DECLARE_GETSETOOP_141(Char, C),
1449 DECLARE_GETSETOOP_141(Int, I),
1450 DECLARE_GETSETOOP_141(Long, J),
1451 DECLARE_GETSETOOP_141(Float, F),
1452 DECLARE_GETSETOOP_141(Double, D),
1453
1454 DECLARE_GETSETNATIVE(Byte, B),
1455 DECLARE_GETSETNATIVE(Short, S),
1456 DECLARE_GETSETNATIVE(Char, C),
1457 DECLARE_GETSETNATIVE(Int, I),
1458 DECLARE_GETSETNATIVE(Long, J),
1459 DECLARE_GETSETNATIVE(Float, F),
1460 DECLARE_GETSETNATIVE(Double, D),
1461
1462 {CC "getAddress", CC "(" ADR ")" ADR, FN_PTR(Unsafe_GetNativeAddress)},
1463 {CC "putAddress", CC "(" ADR "" ADR ")V", FN_PTR(Unsafe_SetNativeAddress)},
1464
1465 {CC "allocateMemory", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory)},
1466 {CC "reallocateMemory", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory)},
1467 {CC "freeMemory", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory)},
1468
1469 {CC "objectFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1470 {CC "staticFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset)},
1471 {CC "staticFieldBase", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1472 {CC "ensureClassInitialized",CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1473 {CC "arrayBaseOffset", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1474 {CC "arrayIndexScale", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale)},
1475 {CC "addressSize", CC "()I", FN_PTR(Unsafe_AddressSize)},
1476 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1477
1478 {CC "defineClass", CC "(" DC0_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)},
1479 {CC "defineClass", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass)},
1480 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1481 {CC "monitorEnter", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorEnter)},
1482 {CC "monitorExit", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorExit)},
1483 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)}
1484
1485 };
1486
1487 // These are the methods prior to the JSR 166 changes in 1.6.0
1488 static JNINativeMethod methods_15[] = {
1489 {CC "getObject", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObject)},
1490 {CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObject)},
1491 {CC "getObjectVolatile",CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObjectVolatile)},
1492 {CC "putObjectVolatile",CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1493
1494
1495 DECLARE_GETSETOOP(Boolean, Z),
1496 DECLARE_GETSETOOP(Byte, B),
1497 DECLARE_GETSETOOP(Short, S),
1498 DECLARE_GETSETOOP(Char, C),
1499 DECLARE_GETSETOOP(Int, I),
1500 DECLARE_GETSETOOP(Long, J),
1501 DECLARE_GETSETOOP(Float, F),
1502 DECLARE_GETSETOOP(Double, D),
1503
1504 DECLARE_GETSETNATIVE(Byte, B),
1505 DECLARE_GETSETNATIVE(Short, S),
1506 DECLARE_GETSETNATIVE(Char, C),
1507 DECLARE_GETSETNATIVE(Int, I),
1508 DECLARE_GETSETNATIVE(Long, J),
1509 DECLARE_GETSETNATIVE(Float, F),
1510 DECLARE_GETSETNATIVE(Double, D),
1511
1512 {CC "getAddress", CC "(" ADR ")" ADR, FN_PTR(Unsafe_GetNativeAddress)},
1513 {CC "putAddress", CC "(" ADR "" ADR ")V", FN_PTR(Unsafe_SetNativeAddress)},
1514
1515 {CC "allocateMemory", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory)},
1516 {CC "reallocateMemory", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory)},
1517 {CC "freeMemory", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory)},
1518
1519 {CC "objectFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1520 {CC "staticFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset)},
1521 {CC "staticFieldBase", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1522 {CC "ensureClassInitialized",CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1523 {CC "arrayBaseOffset", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1524 {CC "arrayIndexScale", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale)},
1525 {CC "addressSize", CC "()I", FN_PTR(Unsafe_AddressSize)},
1526 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1527
1528 {CC "defineClass", CC "(" DC0_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)},
1529 {CC "defineClass", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass)},
1530 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1531 {CC "monitorEnter", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorEnter)},
1532 {CC "monitorExit", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorExit)},
1533 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)},
1534 {CC "compareAndSwapObject", CC "(" OBJ "J" OBJ "" OBJ ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1535 {CC "compareAndSwapInt", CC "(" OBJ "J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1536 {CC "compareAndSwapLong", CC "(" OBJ "J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1537 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)},
1538 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)}
1539
1540 };
1541
1542 // These are the methods for 1.6.0 and 1.7.0
1543 static JNINativeMethod methods_16[] = {
1544 {CC "getObject", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObject)},
1545 {CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObject)},
1546 {CC "getObjectVolatile",CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObjectVolatile)},
1547 {CC "putObjectVolatile",CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1548
1549 DECLARE_GETSETOOP(Boolean, Z),
1550 DECLARE_GETSETOOP(Byte, B),
1551 DECLARE_GETSETOOP(Short, S),
1552 DECLARE_GETSETOOP(Char, C),
1553 DECLARE_GETSETOOP(Int, I),
1554 DECLARE_GETSETOOP(Long, J),
1555 DECLARE_GETSETOOP(Float, F),
1556 DECLARE_GETSETOOP(Double, D),
1557
1558 DECLARE_GETSETNATIVE(Byte, B),
1559 DECLARE_GETSETNATIVE(Short, S),
1560 DECLARE_GETSETNATIVE(Char, C),
1561 DECLARE_GETSETNATIVE(Int, I),
1562 DECLARE_GETSETNATIVE(Long, J),
1563 DECLARE_GETSETNATIVE(Float, F),
1564 DECLARE_GETSETNATIVE(Double, D),
1565
1566 {CC "getAddress", CC "(" ADR ")" ADR, FN_PTR(Unsafe_GetNativeAddress)},
1567 {CC "putAddress", CC "(" ADR "" ADR ")V", FN_PTR(Unsafe_SetNativeAddress)},
1568
1569 {CC "allocateMemory", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory)},
1570 {CC "reallocateMemory", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory)},
1571 {CC "freeMemory", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory)},
1572
1573 {CC "objectFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1574 {CC "staticFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset)},
1575 {CC "staticFieldBase", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1576 {CC "ensureClassInitialized",CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1577 {CC "arrayBaseOffset", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1578 {CC "arrayIndexScale", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale)},
1579 {CC "addressSize", CC "()I", FN_PTR(Unsafe_AddressSize)},
1580 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1581
1582 {CC "defineClass", CC "(" DC0_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)},
1583 {CC "defineClass", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass)},
1584 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1585 {CC "monitorEnter", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorEnter)},
1586 {CC "monitorExit", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorExit)},
1587 {CC "tryMonitorEnter", CC "(" OBJ ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1588 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)},
1589 {CC "compareAndSwapObject", CC "(" OBJ "J" OBJ "" OBJ ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1590 {CC "compareAndSwapInt", CC "(" OBJ "J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1591 {CC "compareAndSwapLong", CC "(" OBJ "J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1592 {CC "putOrderedObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetOrderedObject)},
1593 {CC "putOrderedInt", CC "(" OBJ "JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1594 {CC "putOrderedLong", CC "(" OBJ "JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1595 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)},
1596 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)}
1597 };
1598
1599 // These are the methods for 1.8.0
1600 static JNINativeMethod methods_18[] = {
1601 {CC "getObject", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObject)},
1602 {CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObject)},
1603 {CC "getObjectVolatile",CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObjectVolatile)},
1604 {CC "putObjectVolatile",CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1605
1606 DECLARE_GETSETOOP(Boolean, Z),
1607 DECLARE_GETSETOOP(Byte, B),
1608 DECLARE_GETSETOOP(Short, S),
1609 DECLARE_GETSETOOP(Char, C),
1610 DECLARE_GETSETOOP(Int, I),
1611 DECLARE_GETSETOOP(Long, J),
1612 DECLARE_GETSETOOP(Float, F),
1613 DECLARE_GETSETOOP(Double, D),
1614
1615 DECLARE_GETSETNATIVE(Byte, B),
1616 DECLARE_GETSETNATIVE(Short, S),
1617 DECLARE_GETSETNATIVE(Char, C),
1618 DECLARE_GETSETNATIVE(Int, I),
1619 DECLARE_GETSETNATIVE(Long, J),
1620 DECLARE_GETSETNATIVE(Float, F),
1621 DECLARE_GETSETNATIVE(Double, D),
1622
1623 {CC "getAddress", CC "(" ADR ")" ADR, FN_PTR(Unsafe_GetNativeAddress)},
1624 {CC "putAddress", CC "(" ADR "" ADR ")V", FN_PTR(Unsafe_SetNativeAddress)},
1625
1626 {CC "allocateMemory", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory)},
1627 {CC "reallocateMemory", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory)},
1628 {CC "freeMemory", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory)},
1629
1630 {CC "objectFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1631 {CC "staticFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset)},
1632 {CC "staticFieldBase", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1633 {CC "ensureClassInitialized",CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1634 {CC "arrayBaseOffset", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1635 {CC "arrayIndexScale", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale)},
1636 {CC "addressSize", CC "()I", FN_PTR(Unsafe_AddressSize)},
1637 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1638
1639 {CC "defineClass", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass)},
1640 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1641 {CC "monitorEnter", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorEnter)},
1642 {CC "monitorExit", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorExit)},
1643 {CC "tryMonitorEnter", CC "(" OBJ ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1644 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)},
1645 {CC "compareAndSwapObject", CC "(" OBJ "J" OBJ "" OBJ ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1646 {CC "compareAndSwapInt", CC "(" OBJ "J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1647 {CC "compareAndSwapLong", CC "(" OBJ "J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1648 {CC "putOrderedObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetOrderedObject)},
1649 {CC "putOrderedInt", CC "(" OBJ "JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1650 {CC "putOrderedLong", CC "(" OBJ "JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1651 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)},
1652 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)}
1653 };
1654
1655 JNINativeMethod loadavg_method[] = {
1656 {CC "getLoadAverage", CC "([DI)I", FN_PTR(Unsafe_Loadavg)}
1657 };
1658
1659 JNINativeMethod prefetch_methods[] = {
1660 {CC "prefetchRead", CC "(" OBJ "J)V", FN_PTR(Unsafe_PrefetchRead)},
1661 {CC "prefetchWrite", CC "(" OBJ "J)V", FN_PTR(Unsafe_PrefetchWrite)},
1662 {CC "prefetchReadStatic", CC "(" OBJ "J)V", FN_PTR(Unsafe_PrefetchRead)},
1663 {CC "prefetchWriteStatic",CC "(" OBJ "J)V", FN_PTR(Unsafe_PrefetchWrite)}
1664 };
1665
1666 JNINativeMethod memcopy_methods_17[] = {
1667 {CC "copyMemory", CC "(" OBJ "J" OBJ "JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1668 {CC "setMemory", CC "(" OBJ "JJB)V", FN_PTR(Unsafe_SetMemory2)}
1669 };
1670
1671 JNINativeMethod memcopy_methods_15[] = {
1672 {CC "setMemory", CC "(" ADR "JB)V", FN_PTR(Unsafe_SetMemory)},
1673 {CC "copyMemory", CC "(" ADR ADR "J)V", FN_PTR(Unsafe_CopyMemory)}
1674 };
1675
1676 JNINativeMethod anonk_methods[] = {
1677 {CC "defineAnonymousClass", CC "(" DAC_Args ")" CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1678 };
1679
1680 JNINativeMethod lform_methods[] = {
1681 {CC "shouldBeInitialized",CC "(" CLS ")Z", FN_PTR(Unsafe_ShouldBeInitialized)},
1682 };
1683
1684 JNINativeMethod fence_methods[] = {
1685 {CC "loadFence", CC "()V", FN_PTR(Unsafe_LoadFence)},
1686 {CC "storeFence", CC "()V", FN_PTR(Unsafe_StoreFence)},
1687 {CC "fullFence", CC "()V", FN_PTR(Unsafe_FullFence)},
1688 };
1689
1690 #undef CC
1691 #undef FN_PTR
1692
1693 #undef ADR
1694 #undef LANG
1695 #undef OBJ
1696 #undef CLS
1697 #undef CTR
1698 #undef FLD
1699 #undef MTH
1700 #undef THR
1701 #undef DC0_Args
1702 #undef DC_Args
1703
1704 #undef DECLARE_GETSETOOP
1705 #undef DECLARE_GETSETNATIVE
1706
1707
1708 /**
1709 * Helper method to register native methods.
1710 */
1711 static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1712 int status = env->RegisterNatives(clazz, methods, nMethods);
1713 if (status < 0 || env->ExceptionOccurred()) {
1714 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1715 tty->print_cr("Unsafe: failed registering %s", message);
1716 }
1717 env->ExceptionClear();
1718 return false;
1719 } else {
1720 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1721 tty->print_cr("Unsafe: successfully registered %s", message);
1722 }
1723 return true;
1724 }
1725 }
1726
1727
1728 // This one function is exported, used by NativeLookup.
1729 // The Unsafe_xxx functions above are called only from the interpreter.
1730 // The optimizer looks at names and signatures to recognize
1731 // individual functions.
1732
1733 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1734 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1735 {
1736 ThreadToNativeFromVM ttnfv(thread);
1737
1738 // Unsafe methods
1739 {
1740 bool success = false;
1741 // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6
1742 if (!success) {
1743 success = register_natives("1.6 methods", env, unsafecls, methods_16, sizeof(methods_16)/sizeof(JNINativeMethod));
1744 }
1745 if (!success) {
1746 success = register_natives("1.8 methods", env, unsafecls, methods_18, sizeof(methods_18)/sizeof(JNINativeMethod));
1747 }
1748 if (!success) {
1749 success = register_natives("1.5 methods", env, unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1750 }
1751 if (!success) {
1752 success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1753 }
1754 if (!success) {
1755 success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1756 }
1757 guarantee(success, "register unsafe natives");
1758 }
1759
1760 // Unsafe.getLoadAverage
1761 register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1762
1763 // Prefetch methods
1764 register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1765
1766 // Memory copy methods
1767 {
1768 bool success = false;
1769 if (!success) {
1770 success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod));
1771 }
1772 if (!success) {
1773 success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1774 }
1775 }
1776
1777 // Unsafe.defineAnonymousClass
1778 if (EnableInvokeDynamic) {
1779 register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1780 }
1781
1782 // Unsafe.shouldBeInitialized
1783 if (EnableInvokeDynamic) {
1784 register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod));
1785 }
1786
1787 // Fence methods
1788 register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod));
1789 }
1790 JVM_END