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 #include "gc_implementation/shenandoah/shenandoahBarrierSet.inline.hpp"
31 #endif // INCLUDE_ALL_GCS
32 #include "jfr/jfrEvents.hpp"
33 #include "memory/allocation.inline.hpp"
34 #include "prims/jni.h"
35 #include "prims/jvm.h"
36 #include "runtime/globals.hpp"
37 #include "runtime/interfaceSupport.hpp"
38 #include "runtime/prefetch.inline.hpp"
39 #include "runtime/orderAccess.inline.hpp"
40 #include "runtime/reflection.hpp"
41 #include "runtime/synchronizer.hpp"
42 #include "services/threadService.hpp"
43 #include "utilities/copy.hpp"
44 #include "utilities/dtrace.hpp"
45
46 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
47
48 /*
49 * Implementation of class sun.misc.Unsafe
50 */
51
52 #ifndef USDT2
53 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long);
54 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t);
55 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t);
56 #endif /* !USDT2 */
57
58 #define MAX_OBJECT_SIZE \
59 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
60 + ((julong)max_jint * sizeof(double)) )
61
62
63 #define UNSAFE_ENTRY(result_type, header) \
64 JVM_ENTRY(result_type, header)
65
66 // Can't use UNSAFE_LEAF because it has the signature of a straight
67 // call into the runtime (just like JVM_LEAF, funny that) but it's
68 // called like a Java Native and thus the wrapper built for it passes
69 // arguments like a JNI call. It expects those arguments to be popped
70 // from the stack on Intel like all good JNI args are, and adjusts the
71 // stack according. Since the JVM_LEAF call expects no extra
72 // arguments the stack isn't popped in the C code, is pushed by the
73 // wrapper and we get sick.
74 //#define UNSAFE_LEAF(result_type, header) \
75 // JVM_LEAF(result_type, header)
76
77 #define UNSAFE_END JVM_END
78
79 #define UnsafeWrapper(arg) /*nothing, for the present*/
80
81
82 inline void* addr_from_java(jlong addr) {
83 // This assert fails in a variety of ways on 32-bit systems.
84 // It is impossible to predict whether native code that converts
85 // pointers to longs will sign-extend or zero-extend the addresses.
86 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
87 return (void*)(uintptr_t)addr;
88 }
89
90 inline jlong addr_to_java(void* p) {
91 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
92 return (uintptr_t)p;
93 }
94
95
96 // Note: The VM's obj_field and related accessors use byte-scaled
97 // ("unscaled") offsets, just as the unsafe methods do.
98
99 // However, the method Unsafe.fieldOffset explicitly declines to
100 // guarantee this. The field offset values manipulated by the Java user
101 // through the Unsafe API are opaque cookies that just happen to be byte
102 // offsets. We represent this state of affairs by passing the cookies
103 // through conversion functions when going between the VM and the Unsafe API.
104 // The conversion functions just happen to be no-ops at present.
105
106 inline jlong field_offset_to_byte_offset(jlong field_offset) {
107 return field_offset;
108 }
109
110 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
111 return byte_offset;
112 }
113
114 inline jint invocation_key_from_method_slot(jint slot) {
115 return slot;
116 }
117
118 inline jint invocation_key_to_method_slot(jint key) {
119 return key;
120 }
121
122 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
123 jlong byte_offset = field_offset_to_byte_offset(field_offset);
124 #ifdef ASSERT
125 if (p != NULL) {
126 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
127 if (byte_offset == (jint)byte_offset) {
128 void* ptr_plus_disp = (address)p + byte_offset;
129 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
130 "raw [ptr+disp] must be consistent with oop::field_base");
131 }
132 jlong p_size = HeapWordSize * (jlong)(p->size());
133 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size));
134 }
135 #endif
136 if (sizeof(char*) == sizeof(jint)) // (this constant folds!)
137 return (address)p + (jint) byte_offset;
138 else
139 return (address)p + byte_offset;
140 }
141
142 // Externally callable versions:
143 // (Use these in compiler intrinsics which emulate unsafe primitives.)
144 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
145 return field_offset;
146 }
147 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
148 return byte_offset;
149 }
150 jint Unsafe_invocation_key_from_method_slot(jint slot) {
151 return invocation_key_from_method_slot(slot);
152 }
153 jint Unsafe_invocation_key_to_method_slot(jint key) {
154 return invocation_key_to_method_slot(key);
155 }
156
157
158 ///// Data in the Java heap.
159
160 #define truncate_jboolean(x) ((x) & 1)
161 #define truncate_jbyte(x) (x)
162 #define truncate_jshort(x) (x)
163 #define truncate_jchar(x) (x)
164 #define truncate_jint(x) (x)
165 #define truncate_jlong(x) (x)
166 #define truncate_jfloat(x) (x)
167 #define truncate_jdouble(x) (x)
168
169 #define GET_FIELD(obj, offset, type_name, v) \
170 oop p = JNIHandles::resolve(obj); \
171 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
172
173 #define SET_FIELD(obj, offset, type_name, x) \
174 oop p = JNIHandles::resolve(obj); \
175 *(type_name*)index_oop_from_field_offset_long(p, offset) = truncate_##type_name(x)
176
177 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
178 oop p = JNIHandles::resolve(obj); \
179 if (support_IRIW_for_not_multiple_copy_atomic_cpu) { \
180 OrderAccess::fence(); \
181 } \
182 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
183
184 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
185 oop p = JNIHandles::resolve(obj); \
186 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), truncate_##type_name(x));
187
188 // Macros for oops that check UseCompressedOops
189
190 #define GET_OOP_FIELD(obj, offset, v) \
191 oop p = JNIHandles::resolve(obj); \
192 oop v; \
193 if (UseCompressedOops) { \
194 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
195 v = oopDesc::decode_heap_oop(n); \
196 } else { \
197 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
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 || (UseShenandoahGC && ShenandoahSATBBarrier)) && 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 #if INCLUDE_ALL_GCS
234 if (UseShenandoahGC) {
235 v = ShenandoahBarrierSet::barrier_set()->load_reference_barrier(v);
236 }
237 #endif
238
239 ensure_satb_referent_alive(p, offset, v);
240
241 return JNIHandles::make_local(env, v);
242 UNSAFE_END
243
244 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
245 UnsafeWrapper("Unsafe_SetObject");
246 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
247 oop x = JNIHandles::resolve(x_h);
248 //SET_FIELD(obj, offset, oop, x);
249 oop p = JNIHandles::resolve(obj);
250 if (UseCompressedOops) {
251 if (x != NULL) {
252 // If there is a heap base pointer, we are obliged to emit a store barrier.
253 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
254 } else {
255 narrowOop n = oopDesc::encode_heap_oop_not_null(x);
256 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
257 }
258 } else {
259 if (x != NULL) {
260 // If there is a heap base pointer, we are obliged to emit a store barrier.
261 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
262 } else {
263 *(oop*)index_oop_from_field_offset_long(p, offset) = x;
264 }
265 }
266 UNSAFE_END
267
268 // The normal variants allow a null base pointer with an arbitrary address.
269 // But if the base pointer is non-null, the offset should make some sense.
270 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
271 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
272 UnsafeWrapper("Unsafe_GetObject");
273 GET_OOP_FIELD(obj, offset, v)
274
275 #if INCLUDE_ALL_GCS
276 if (UseShenandoahGC) {
277 v = ShenandoahBarrierSet::barrier_set()->load_reference_barrier(v);
278 }
279 #endif
280
281 ensure_satb_referent_alive(p, offset, v);
282
283 return JNIHandles::make_local(env, v);
284 UNSAFE_END
285
286 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
287 UnsafeWrapper("Unsafe_SetObject");
288 oop x = JNIHandles::resolve(x_h);
289 oop p = JNIHandles::resolve(obj);
290 if (UseCompressedOops) {
291 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
292 } else {
293 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
294 }
295 UNSAFE_END
296
297 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
298 UnsafeWrapper("Unsafe_GetObjectVolatile");
299 oop p = JNIHandles::resolve(obj);
300 void* addr = index_oop_from_field_offset_long(p, offset);
301 volatile oop v;
302 if (UseCompressedOops) {
303 volatile narrowOop n = *(volatile narrowOop*) addr;
304 (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n));
305 } else {
306 (void)const_cast<oop&>(v = *(volatile oop*) addr);
307 }
308
309 #if INCLUDE_ALL_GCS
310 if (UseShenandoahGC) {
311 (void)const_cast<oop&>(v = ShenandoahBarrierSet::barrier_set()->load_reference_barrier(v));
312 }
313 #endif
314
315 ensure_satb_referent_alive(p, offset, v);
316
317 OrderAccess::acquire();
318 return JNIHandles::make_local(env, v);
319 UNSAFE_END
320
321 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
322 UnsafeWrapper("Unsafe_SetObjectVolatile");
323 oop x = JNIHandles::resolve(x_h);
324 oop p = JNIHandles::resolve(obj);
325 void* addr = index_oop_from_field_offset_long(p, offset);
326 OrderAccess::release();
327 if (UseCompressedOops) {
328 oop_store((narrowOop*)addr, x);
329 } else {
330 oop_store((oop*)addr, x);
331 }
332 OrderAccess::fence();
333 UNSAFE_END
334
335 #ifndef SUPPORTS_NATIVE_CX8
336
337 // VM_Version::supports_cx8() is a surrogate for 'supports atomic long memory ops'.
338 //
339 // On platforms which do not support atomic compare-and-swap of jlong (8 byte)
340 // values we have to use a lock-based scheme to enforce atomicity. This has to be
341 // applied to all Unsafe operations that set the value of a jlong field. Even so
342 // the compareAndSwapLong operation will not be atomic with respect to direct stores
343 // to the field from Java code. It is important therefore that any Java code that
344 // utilizes these Unsafe jlong operations does not perform direct stores. To permit
345 // direct loads of the field from Java code we must also use Atomic::store within the
346 // locked regions. And for good measure, in case there are direct stores, we also
347 // employ Atomic::load within those regions. Note that the field in question must be
348 // volatile and so must have atomic load/store accesses applied at the Java level.
349 //
350 // The locking scheme could utilize a range of strategies for controlling the locking
351 // granularity: from a lock per-field through to a single global lock. The latter is
352 // the simplest and is used for the current implementation. Note that the Java object
353 // that contains the field, can not, in general, be used for locking. To do so can lead
354 // to deadlocks as we may introduce locking into what appears to the Java code to be a
355 // lock-free path.
356 //
357 // As all the locked-regions are very short and themselves non-blocking we can treat
358 // them as leaf routines and elide safepoint checks (ie we don't perform any thread
359 // state transitions even when blocking for the lock). Note that if we do choose to
360 // add safepoint checks and thread state transitions, we must ensure that we calculate
361 // the address of the field _after_ we have acquired the lock, else the object may have
362 // been moved by the GC
363
364 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
365 UnsafeWrapper("Unsafe_GetLongVolatile");
366 {
367 if (VM_Version::supports_cx8()) {
368 GET_FIELD_VOLATILE(obj, offset, jlong, v);
369 return v;
370 }
371 else {
372 Handle p (THREAD, JNIHandles::resolve(obj));
373 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
374 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
375 jlong value = Atomic::load(addr);
376 return value;
377 }
378 }
379 UNSAFE_END
380
381 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
382 UnsafeWrapper("Unsafe_SetLongVolatile");
383 {
384 if (VM_Version::supports_cx8()) {
385 SET_FIELD_VOLATILE(obj, offset, jlong, x);
386 }
387 else {
388 Handle p (THREAD, JNIHandles::resolve(obj));
389 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
390 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
391 Atomic::store(x, addr);
392 }
393 }
394 UNSAFE_END
395
396 #endif // not SUPPORTS_NATIVE_CX8
397
398 #define DEFINE_GETSETOOP(jboolean, Boolean) \
399 \
400 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
401 UnsafeWrapper("Unsafe_Get"#Boolean); \
402 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
403 GET_FIELD(obj, offset, jboolean, v); \
404 return v; \
405 UNSAFE_END \
406 \
407 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
408 UnsafeWrapper("Unsafe_Set"#Boolean); \
409 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
410 SET_FIELD(obj, offset, jboolean, x); \
411 UNSAFE_END \
412 \
413 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
414 UnsafeWrapper("Unsafe_Get"#Boolean); \
415 GET_FIELD(obj, offset, jboolean, v); \
416 return v; \
417 UNSAFE_END \
418 \
419 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
420 UnsafeWrapper("Unsafe_Set"#Boolean); \
421 SET_FIELD(obj, offset, jboolean, x); \
422 UNSAFE_END \
423 \
424 // END DEFINE_GETSETOOP.
425
426 DEFINE_GETSETOOP(jboolean, Boolean)
427 DEFINE_GETSETOOP(jbyte, Byte)
428 DEFINE_GETSETOOP(jshort, Short);
429 DEFINE_GETSETOOP(jchar, Char);
430 DEFINE_GETSETOOP(jint, Int);
431 DEFINE_GETSETOOP(jlong, Long);
432 DEFINE_GETSETOOP(jfloat, Float);
433 DEFINE_GETSETOOP(jdouble, Double);
434
435 #undef DEFINE_GETSETOOP
436
437 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
438 \
439 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
440 UnsafeWrapper("Unsafe_Get"#Boolean); \
441 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
442 return v; \
443 UNSAFE_END \
444 \
445 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
446 UnsafeWrapper("Unsafe_Set"#Boolean); \
447 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
448 UNSAFE_END \
449 \
450 // END DEFINE_GETSETOOP_VOLATILE.
451
452 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
453 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
454 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
455 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
456 DEFINE_GETSETOOP_VOLATILE(jint, Int);
457 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
458 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
459
460 #ifdef SUPPORTS_NATIVE_CX8
461 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
462 #endif
463
464 #undef DEFINE_GETSETOOP_VOLATILE
465
466 // The non-intrinsified versions of setOrdered just use setVolatile
467
468 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
469 UnsafeWrapper("Unsafe_SetOrderedInt");
470 SET_FIELD_VOLATILE(obj, offset, jint, x);
471 UNSAFE_END
472
473 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
474 UnsafeWrapper("Unsafe_SetOrderedObject");
475 oop x = JNIHandles::resolve(x_h);
476 oop p = JNIHandles::resolve(obj);
477 void* addr = index_oop_from_field_offset_long(p, offset);
478 OrderAccess::release();
479 if (UseCompressedOops) {
480 oop_store((narrowOop*)addr, x);
481 } else {
482 oop_store((oop*)addr, x);
483 }
484 OrderAccess::fence();
485 UNSAFE_END
486
487 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
488 UnsafeWrapper("Unsafe_SetOrderedLong");
489 #ifdef SUPPORTS_NATIVE_CX8
490 SET_FIELD_VOLATILE(obj, offset, jlong, x);
491 #else
492 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
493 {
494 if (VM_Version::supports_cx8()) {
495 SET_FIELD_VOLATILE(obj, offset, jlong, x);
496 }
497 else {
498 Handle p (THREAD, JNIHandles::resolve(obj));
499 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
500 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
501 Atomic::store(x, addr);
502 }
503 }
504 #endif
505 UNSAFE_END
506
507 UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe))
508 UnsafeWrapper("Unsafe_LoadFence");
509 OrderAccess::acquire();
510 UNSAFE_END
511
512 UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe))
513 UnsafeWrapper("Unsafe_StoreFence");
514 OrderAccess::release();
515 UNSAFE_END
516
517 UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe))
518 UnsafeWrapper("Unsafe_FullFence");
519 OrderAccess::fence();
520 UNSAFE_END
521
522 ////// Data in the C heap.
523
524 // Note: These do not throw NullPointerException for bad pointers.
525 // They just crash. Only a oop base pointer can generate a NullPointerException.
526 //
527 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
528 \
529 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
530 UnsafeWrapper("Unsafe_GetNative"#Type); \
531 void* p = addr_from_java(addr); \
532 JavaThread* t = JavaThread::current(); \
533 t->set_doing_unsafe_access(true); \
534 java_type x = *(volatile native_type*)p; \
535 t->set_doing_unsafe_access(false); \
536 return x; \
537 UNSAFE_END \
538 \
539 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
540 UnsafeWrapper("Unsafe_SetNative"#Type); \
541 JavaThread* t = JavaThread::current(); \
542 t->set_doing_unsafe_access(true); \
543 void* p = addr_from_java(addr); \
544 *(volatile native_type*)p = x; \
545 t->set_doing_unsafe_access(false); \
546 UNSAFE_END \
547 \
548 // END DEFINE_GETSETNATIVE.
549
550 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
551 DEFINE_GETSETNATIVE(jshort, Short, signed short);
552 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
553 DEFINE_GETSETNATIVE(jint, Int, jint);
554 // no long -- handled specially
555 DEFINE_GETSETNATIVE(jfloat, Float, float);
556 DEFINE_GETSETNATIVE(jdouble, Double, double);
557
558 #undef DEFINE_GETSETNATIVE
559
560 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
561 UnsafeWrapper("Unsafe_GetNativeLong");
562 JavaThread* t = JavaThread::current();
563 // We do it this way to avoid problems with access to heap using 64
564 // bit loads, as jlong in heap could be not 64-bit aligned, and on
565 // some CPUs (SPARC) it leads to SIGBUS.
566 t->set_doing_unsafe_access(true);
567 void* p = addr_from_java(addr);
568 jlong x;
569 if (((intptr_t)p & 7) == 0) {
570 // jlong is aligned, do a volatile access
571 x = *(volatile jlong*)p;
572 } else {
573 jlong_accessor acc;
574 acc.words[0] = ((volatile jint*)p)[0];
575 acc.words[1] = ((volatile jint*)p)[1];
576 x = acc.long_value;
577 }
578 t->set_doing_unsafe_access(false);
579 return x;
580 UNSAFE_END
581
582 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
583 UnsafeWrapper("Unsafe_SetNativeLong");
584 JavaThread* t = JavaThread::current();
585 // see comment for Unsafe_GetNativeLong
586 t->set_doing_unsafe_access(true);
587 void* p = addr_from_java(addr);
588 if (((intptr_t)p & 7) == 0) {
589 // jlong is aligned, do a volatile access
590 *(volatile jlong*)p = x;
591 } else {
592 jlong_accessor acc;
593 acc.long_value = x;
594 ((volatile jint*)p)[0] = acc.words[0];
595 ((volatile jint*)p)[1] = acc.words[1];
596 }
597 t->set_doing_unsafe_access(false);
598 UNSAFE_END
599
600
601 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
602 UnsafeWrapper("Unsafe_GetNativeAddress");
603 void* p = addr_from_java(addr);
604 return addr_to_java(*(void**)p);
605 UNSAFE_END
606
607 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
608 UnsafeWrapper("Unsafe_SetNativeAddress");
609 void* p = addr_from_java(addr);
610 *(void**)p = addr_from_java(x);
611 UNSAFE_END
612
613
614 ////// Allocation requests
615
616 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
617 UnsafeWrapper("Unsafe_AllocateInstance");
618 {
619 ThreadToNativeFromVM ttnfv(thread);
620 return env->AllocObject(cls);
621 }
622 UNSAFE_END
623
624 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
625 UnsafeWrapper("Unsafe_AllocateMemory");
626 size_t sz = (size_t)size;
627 if (sz != (julong)size || size < 0) {
628 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
629 }
630 if (sz == 0) {
631 return 0;
632 }
633 sz = round_to(sz, HeapWordSize);
634 void* x = os::malloc(sz, mtInternal);
635 if (x == NULL) {
636 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
637 }
638 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
639 return addr_to_java(x);
640 UNSAFE_END
641
642 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
643 UnsafeWrapper("Unsafe_ReallocateMemory");
644 void* p = addr_from_java(addr);
645 size_t sz = (size_t)size;
646 if (sz != (julong)size || size < 0) {
647 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
648 }
649 if (sz == 0) {
650 os::free(p);
651 return 0;
652 }
653 sz = round_to(sz, HeapWordSize);
654 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal);
655 if (x == NULL) {
656 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
657 }
658 return addr_to_java(x);
659 UNSAFE_END
660
661 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
662 UnsafeWrapper("Unsafe_FreeMemory");
663 void* p = addr_from_java(addr);
664 if (p == NULL) {
665 return;
666 }
667 os::free(p);
668 UNSAFE_END
669
670 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
671 UnsafeWrapper("Unsafe_SetMemory");
672 size_t sz = (size_t)size;
673 if (sz != (julong)size || size < 0) {
674 THROW(vmSymbols::java_lang_IllegalArgumentException());
675 }
676 char* p = (char*) addr_from_java(addr);
677 Copy::fill_to_memory_atomic(p, sz, value);
678 UNSAFE_END
679
680 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
681 UnsafeWrapper("Unsafe_SetMemory");
682 size_t sz = (size_t)size;
683 if (sz != (julong)size || size < 0) {
684 THROW(vmSymbols::java_lang_IllegalArgumentException());
685 }
686 oop base = JNIHandles::resolve(obj);
687 void* p = index_oop_from_field_offset_long(base, offset);
688 Copy::fill_to_memory_atomic(p, sz, value);
689 UNSAFE_END
690
691 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
692 UnsafeWrapper("Unsafe_CopyMemory");
693 if (size == 0) {
694 return;
695 }
696 size_t sz = (size_t)size;
697 if (sz != (julong)size || size < 0) {
698 THROW(vmSymbols::java_lang_IllegalArgumentException());
699 }
700 void* src = addr_from_java(srcAddr);
701 void* dst = addr_from_java(dstAddr);
702 Copy::conjoint_memory_atomic(src, dst, sz);
703 UNSAFE_END
704
705 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
706 UnsafeWrapper("Unsafe_CopyMemory");
707 if (size == 0) {
708 return;
709 }
710 size_t sz = (size_t)size;
711 if (sz != (julong)size || size < 0) {
712 THROW(vmSymbols::java_lang_IllegalArgumentException());
713 }
714 oop srcp = JNIHandles::resolve(srcObj);
715 oop dstp = JNIHandles::resolve(dstObj);
716 if (dstp != NULL && !dstp->is_typeArray()) {
717 // NYI: This works only for non-oop arrays at present.
718 // Generalizing it would be reasonable, but requires card marking.
719 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
720 THROW(vmSymbols::java_lang_IllegalArgumentException());
721 }
722 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
723 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
724 Copy::conjoint_memory_atomic(src, dst, sz);
725 UNSAFE_END
726
727
728 ////// Random queries
729
730 // See comment at file start about UNSAFE_LEAF
731 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
732 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
733 UnsafeWrapper("Unsafe_AddressSize");
734 return sizeof(void*);
735 UNSAFE_END
736
737 // See comment at file start about UNSAFE_LEAF
738 //UNSAFE_LEAF(jint, Unsafe_PageSize())
739 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
740 UnsafeWrapper("Unsafe_PageSize");
741 return os::vm_page_size();
742 UNSAFE_END
743
744 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
745 if (field == NULL) {
746 THROW_0(vmSymbols::java_lang_NullPointerException());
747 }
748
749 oop reflected = JNIHandles::resolve_non_null(field);
750 oop mirror = java_lang_reflect_Field::clazz(reflected);
751 Klass* k = java_lang_Class::as_Klass(mirror);
752 int slot = java_lang_reflect_Field::slot(reflected);
753 int modifiers = java_lang_reflect_Field::modifiers(reflected);
754
755 if (must_be_static >= 0) {
756 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
757 if (must_be_static != really_is_static) {
758 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
759 }
760 }
761
762 int offset = InstanceKlass::cast(k)->field_offset(slot);
763 return field_offset_from_byte_offset(offset);
764 }
765
766 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
767 UnsafeWrapper("Unsafe_ObjectFieldOffset");
768 return find_field_offset(field, 0, THREAD);
769 UNSAFE_END
770
771 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
772 UnsafeWrapper("Unsafe_StaticFieldOffset");
773 return find_field_offset(field, 1, THREAD);
774 UNSAFE_END
775
776 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
777 UnsafeWrapper("Unsafe_StaticFieldBase");
778 // Note: In this VM implementation, a field address is always a short
779 // offset from the base of a a klass metaobject. Thus, the full dynamic
780 // range of the return type is never used. However, some implementations
781 // might put the static field inside an array shared by many classes,
782 // or even at a fixed address, in which case the address could be quite
783 // large. In that last case, this function would return NULL, since
784 // the address would operate alone, without any base pointer.
785
786 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
787
788 oop reflected = JNIHandles::resolve_non_null(field);
789 oop mirror = java_lang_reflect_Field::clazz(reflected);
790 int modifiers = java_lang_reflect_Field::modifiers(reflected);
791
792 if ((modifiers & JVM_ACC_STATIC) == 0) {
793 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
794 }
795
796 return JNIHandles::make_local(env, mirror);
797 UNSAFE_END
798
799 //@deprecated
800 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
801 UnsafeWrapper("Unsafe_FieldOffset");
802 // tries (but fails) to be polymorphic between static and non-static:
803 jlong offset = find_field_offset(field, -1, THREAD);
804 guarantee(offset == (jint)offset, "offset fits in 32 bits");
805 return (jint)offset;
806 UNSAFE_END
807
808 //@deprecated
809 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
810 UnsafeWrapper("Unsafe_StaticFieldBase");
811 if (clazz == NULL) {
812 THROW_0(vmSymbols::java_lang_NullPointerException());
813 }
814 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
815 UNSAFE_END
816
817 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
818 UnsafeWrapper("Unsafe_EnsureClassInitialized");
819 if (clazz == NULL) {
820 THROW(vmSymbols::java_lang_NullPointerException());
821 }
822 oop mirror = JNIHandles::resolve_non_null(clazz);
823
824 Klass* klass = java_lang_Class::as_Klass(mirror);
825 if (klass != NULL && klass->should_be_initialized()) {
826 InstanceKlass* k = InstanceKlass::cast(klass);
827 k->initialize(CHECK);
828 }
829 }
830 UNSAFE_END
831
832 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
833 UnsafeWrapper("Unsafe_ShouldBeInitialized");
834 if (clazz == NULL) {
835 THROW_(vmSymbols::java_lang_NullPointerException(), false);
836 }
837 oop mirror = JNIHandles::resolve_non_null(clazz);
838 Klass* klass = java_lang_Class::as_Klass(mirror);
839 if (klass != NULL && klass->should_be_initialized()) {
840 return true;
841 }
842 return false;
843 }
844 UNSAFE_END
845
846 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
847 if (acls == NULL) {
848 THROW(vmSymbols::java_lang_NullPointerException());
849 }
850 oop mirror = JNIHandles::resolve_non_null(acls);
851 Klass* k = java_lang_Class::as_Klass(mirror);
852 if (k == NULL || !k->oop_is_array()) {
853 THROW(vmSymbols::java_lang_InvalidClassException());
854 } else if (k->oop_is_objArray()) {
855 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
856 scale = heapOopSize;
857 } else if (k->oop_is_typeArray()) {
858 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
859 base = tak->array_header_in_bytes();
860 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
861 scale = (1 << tak->log2_element_size());
862 } else {
863 ShouldNotReachHere();
864 }
865 }
866
867 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
868 UnsafeWrapper("Unsafe_ArrayBaseOffset");
869 int base = 0, scale = 0;
870 getBaseAndScale(base, scale, acls, CHECK_0);
871 return field_offset_from_byte_offset(base);
872 UNSAFE_END
873
874
875 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
876 UnsafeWrapper("Unsafe_ArrayIndexScale");
877 int base = 0, scale = 0;
878 getBaseAndScale(base, scale, acls, CHECK_0);
879 // This VM packs both fields and array elements down to the byte.
880 // But watch out: If this changes, so that array references for
881 // a given primitive type (say, T_BOOLEAN) use different memory units
882 // than fields, this method MUST return zero for such arrays.
883 // For example, the VM used to store sub-word sized fields in full
884 // words in the object layout, so that accessors like getByte(Object,int)
885 // did not really do what one might expect for arrays. Therefore,
886 // this function used to report a zero scale factor, so that the user
887 // would know not to attempt to access sub-word array elements.
888 // // Code for unpacked fields:
889 // if (scale < wordSize) return 0;
890
891 // The following allows for a pretty general fieldOffset cookie scheme,
892 // but requires it to be linear in byte offset.
893 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
894 UNSAFE_END
895
896
897 static inline void throw_new(JNIEnv *env, const char *ename) {
898 char buf[100];
899 strcpy(buf, "java/lang/");
900 strcat(buf, ename);
901 jclass cls = env->FindClass(buf);
902 if (env->ExceptionCheck()) {
903 env->ExceptionClear();
904 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf);
905 return;
906 }
907 char* msg = NULL;
908 env->ThrowNew(cls, msg);
909 }
910
911 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
912 {
913 // Code lifted from JDK 1.3 ClassLoader.c
914
915 jbyte *body;
916 char *utfName;
917 jclass result = 0;
918 char buf[128];
919
920 if (UsePerfData) {
921 ClassLoader::unsafe_defineClassCallCounter()->inc();
922 }
923
924 if (data == NULL) {
925 throw_new(env, "NullPointerException");
926 return 0;
927 }
928
929 /* Work around 4153825. malloc crashes on Solaris when passed a
930 * negative size.
931 */
932 if (length < 0) {
933 throw_new(env, "ArrayIndexOutOfBoundsException");
934 return 0;
935 }
936
937 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
938
939 if (body == 0) {
940 throw_new(env, "OutOfMemoryError");
941 return 0;
942 }
943
944 env->GetByteArrayRegion(data, offset, length, body);
945
946 if (env->ExceptionOccurred())
947 goto free_body;
948
949 if (name != NULL) {
950 uint len = env->GetStringUTFLength(name);
951 int unicode_len = env->GetStringLength(name);
952 if (len >= sizeof(buf)) {
953 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
954 if (utfName == NULL) {
955 throw_new(env, "OutOfMemoryError");
956 goto free_body;
957 }
958 } else {
959 utfName = buf;
960 }
961 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
962 //VerifyFixClassname(utfName);
963 for (uint i = 0; i < len; i++) {
964 if (utfName[i] == '.') utfName[i] = '/';
965 }
966 } else {
967 utfName = NULL;
968 }
969
970 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
971
972 if (utfName && utfName != buf)
973 FREE_C_HEAP_ARRAY(char, utfName, mtInternal);
974
975 free_body:
976 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal);
977 return result;
978 }
979 }
980
981
982 UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
983 UnsafeWrapper("Unsafe_DefineClass");
984 {
985 ThreadToNativeFromVM ttnfv(thread);
986 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
987 }
988 UNSAFE_END
989
990
991 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
992 UnsafeWrapper("Unsafe_DefineClass");
993 {
994 ThreadToNativeFromVM ttnfv(thread);
995
996 int depthFromDefineClass0 = 1;
997 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
998 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
999 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
1000
1001 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
1002 }
1003 UNSAFE_END
1004
1005
1006 #define DAC_Args CLS"[B["OBJ
1007 // define a class but do not make it known to the class loader or system dictionary
1008 // - host_class: supplies context for linkage, access control, protection domain, and class loader
1009 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
1010 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
1011
1012 // When you load an anonymous class U, it works as if you changed its name just before loading,
1013 // to a name that you will never use again. Since the name is lost, no other class can directly
1014 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
1015 // through java.lang.Class methods like Class.newInstance.
1016
1017 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
1018 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
1019 // An anonymous class also has special privileges to access any member of its host class.
1020 // This is the main reason why this loading operation is unsafe. The purpose of this is to
1021 // allow language implementations to simulate "open classes"; a host class in effect gets
1022 // new code when an anonymous class is loaded alongside it. A less convenient but more
1023 // standard way to do this is with reflection, which can also be set to ignore access
1024 // restrictions.
1025
1026 // Access into an anonymous class is possible only through reflection. Therefore, there
1027 // are no special access rules for calling into an anonymous class. The relaxed access
1028 // rule for the host class is applied in the opposite direction: A host class reflectively
1029 // access one of its anonymous classes.
1030
1031 // If you load the same bytecodes twice, you get two different classes. You can reload
1032 // the same bytecodes with or without varying CP patches.
1033
1034 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
1035 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
1036 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
1037
1038 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
1039 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
1040 // It is not possible for a named class, or an older anonymous class, to refer by
1041 // name (via its CP) to a newer anonymous class.
1042
1043 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
1044 // or type descriptors used in the loaded anonymous class.
1045
1046 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
1047 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
1048 // be changed to println(greeting), where greeting is an arbitrary object created before
1049 // the anonymous class is loaded. This is useful in dynamic languages, in which
1050 // various kinds of metaobjects must be introduced as constants into bytecode.
1051 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
1052 // not just a literal string. For such ldc instructions, the verifier uses the
1053 // type Object instead of String, if the loaded constant is not in fact a String.
1054
1055 static instanceKlassHandle
1056 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
1057 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
1058 HeapWord* *temp_alloc,
1059 TRAPS) {
1060
1061 if (UsePerfData) {
1062 ClassLoader::unsafe_defineClassCallCounter()->inc();
1063 }
1064
1065 if (data == NULL) {
1066 THROW_0(vmSymbols::java_lang_NullPointerException());
1067 }
1068
1069 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
1070 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
1071 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal);
1072 if (body == NULL) {
1073 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1074 }
1075
1076 // caller responsible to free it:
1077 (*temp_alloc) = body;
1078
1079 {
1080 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1081 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1082 }
1083
1084 u1* class_bytes = (u1*) body;
1085 int class_bytes_length = (int) length;
1086 if (class_bytes_length < 0) class_bytes_length = 0;
1087 if (class_bytes == NULL
1088 || host_class == NULL
1089 || length != class_bytes_length)
1090 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1091
1092 objArrayHandle cp_patches_h;
1093 if (cp_patches_jh != NULL) {
1094 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1095 if (!p->is_objArray())
1096 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1097 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1098 }
1099
1100 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class)));
1101 const char* host_source = host_klass->external_name();
1102 Handle host_loader(THREAD, host_klass->class_loader());
1103 Handle host_domain(THREAD, host_klass->protection_domain());
1104
1105 GrowableArray<Handle>* cp_patches = NULL;
1106 if (cp_patches_h.not_null()) {
1107 int alen = cp_patches_h->length();
1108 for (int i = alen-1; i >= 0; i--) {
1109 oop p = cp_patches_h->obj_at(i);
1110 if (p != NULL) {
1111 Handle patch(THREAD, p);
1112 if (cp_patches == NULL)
1113 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1114 cp_patches->at_put(i, patch);
1115 }
1116 }
1117 }
1118
1119 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1120
1121 instanceKlassHandle anon_klass;
1122 {
1123 Symbol* no_class_name = NULL;
1124 Klass* anonk = SystemDictionary::parse_stream(no_class_name,
1125 host_loader, host_domain,
1126 &st, host_klass, cp_patches,
1127 CHECK_NULL);
1128 if (anonk == NULL) return NULL;
1129 anon_klass = instanceKlassHandle(THREAD, anonk);
1130 }
1131
1132 return anon_klass;
1133 }
1134
1135 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1136 {
1137 instanceKlassHandle anon_klass;
1138 jobject res_jh = NULL;
1139
1140 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1141 ResourceMark rm(THREAD);
1142
1143 HeapWord* temp_alloc = NULL;
1144
1145 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data,
1146 cp_patches_jh,
1147 &temp_alloc, THREAD);
1148 if (anon_klass() != NULL)
1149 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
1150
1151 // try/finally clause:
1152 if (temp_alloc != NULL) {
1153 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal);
1154 }
1155
1156 // The anonymous class loader data has been artificially been kept alive to
1157 // this point. The mirror and any instances of this class have to keep
1158 // it alive afterwards.
1159 if (anon_klass() != NULL) {
1160 anon_klass->class_loader_data()->set_keep_alive(false);
1161 }
1162
1163 // let caller initialize it as needed...
1164
1165 return (jclass) res_jh;
1166 }
1167 UNSAFE_END
1168
1169
1170
1171 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1172 UnsafeWrapper("Unsafe_MonitorEnter");
1173 {
1174 if (jobj == NULL) {
1175 THROW(vmSymbols::java_lang_NullPointerException());
1176 }
1177 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1178 ObjectSynchronizer::jni_enter(obj, CHECK);
1179 }
1180 UNSAFE_END
1181
1182
1183 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1184 UnsafeWrapper("Unsafe_TryMonitorEnter");
1185 {
1186 if (jobj == NULL) {
1187 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1188 }
1189 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1190 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1191 return (res ? JNI_TRUE : JNI_FALSE);
1192 }
1193 UNSAFE_END
1194
1195
1196 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1197 UnsafeWrapper("Unsafe_MonitorExit");
1198 {
1199 if (jobj == NULL) {
1200 THROW(vmSymbols::java_lang_NullPointerException());
1201 }
1202 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1203 ObjectSynchronizer::jni_exit(obj(), CHECK);
1204 }
1205 UNSAFE_END
1206
1207
1208 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1209 UnsafeWrapper("Unsafe_ThrowException");
1210 {
1211 ThreadToNativeFromVM ttnfv(thread);
1212 env->Throw(thr);
1213 }
1214 UNSAFE_END
1215
1216 // JSR166 ------------------------------------------------------------------
1217
1218 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1219 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1220 oop x = JNIHandles::resolve(x_h);
1221 oop e = JNIHandles::resolve(e_h);
1222 oop p = JNIHandles::resolve(obj);
1223 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1224 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
1225 jboolean success = (res == e);
1226 if (success)
1227 update_barrier_set((void*)addr, x);
1228 return success;
1229 UNSAFE_END
1230
1231 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1232 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1233 oop p = JNIHandles::resolve(obj);
1234 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1235 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1236 UNSAFE_END
1237
1238 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1239 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1240 Handle p (THREAD, JNIHandles::resolve(obj));
1241 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1242 #ifdef SUPPORTS_NATIVE_CX8
1243 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1244 #else
1245 if (VM_Version::supports_cx8())
1246 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1247 else {
1248 jboolean success = false;
1249 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
1250 jlong val = Atomic::load(addr);
1251 if (val == e) { Atomic::store(x, addr); success = true; }
1252 return success;
1253 }
1254 #endif
1255 UNSAFE_END
1256
1257 static void post_thread_park_event(EventThreadPark* event, const oop obj, jlong timeout_nanos, jlong until_epoch_millis) {
1258 assert(event != NULL, "invariant");
1259 assert(event->should_commit(), "invariant");
1260 event->set_parkedClass((obj != NULL) ? obj->klass() : NULL);
1261 event->set_timeout(timeout_nanos);
1262 event->set_until(until_epoch_millis);
1263 event->set_address((obj != NULL) ? (u8)cast_from_oop<uintptr_t>(obj) : 0);
1264 event->commit();
1265 }
1266
1267 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1268 UnsafeWrapper("Unsafe_Park");
1269 EventThreadPark event;
1270 #ifndef USDT2
1271 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1272 #else /* USDT2 */
1273 HOTSPOT_THREAD_PARK_BEGIN(
1274 (uintptr_t) thread->parker(), (int) isAbsolute, time);
1275 #endif /* USDT2 */
1276 JavaThreadParkedState jtps(thread, time != 0);
1277 thread->parker()->park(isAbsolute != 0, time);
1278 #ifndef USDT2
1279 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1280 #else /* USDT2 */
1281 HOTSPOT_THREAD_PARK_END(
1282 (uintptr_t) thread->parker());
1283 #endif /* USDT2 */
1284 if (event.should_commit()) {
1285 const oop obj = thread->current_park_blocker();
1286 if (time == 0) {
1287 post_thread_park_event(&event, obj, min_jlong, min_jlong);
1288 } else {
1289 if (isAbsolute != 0) {
1290 post_thread_park_event(&event, obj, min_jlong, time);
1291 } else {
1292 post_thread_park_event(&event, obj, time, min_jlong);
1293 }
1294 }
1295 }
1296 UNSAFE_END
1297
1298 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1299 UnsafeWrapper("Unsafe_Unpark");
1300 Parker* p = NULL;
1301 if (jthread != NULL) {
1302 oop java_thread = JNIHandles::resolve_non_null(jthread);
1303 if (java_thread != NULL) {
1304 jlong lp = java_lang_Thread::park_event(java_thread);
1305 if (lp != 0) {
1306 // This cast is OK even though the jlong might have been read
1307 // non-atomically on 32bit systems, since there, one word will
1308 // always be zero anyway and the value set is always the same
1309 p = (Parker*)addr_from_java(lp);
1310 } else {
1311 // Grab lock if apparently null or using older version of library
1312 MutexLocker mu(Threads_lock);
1313 java_thread = JNIHandles::resolve_non_null(jthread);
1314 if (java_thread != NULL) {
1315 JavaThread* thr = java_lang_Thread::thread(java_thread);
1316 if (thr != NULL) {
1317 p = thr->parker();
1318 if (p != NULL) { // Bind to Java thread for next time.
1319 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1320 }
1321 }
1322 }
1323 }
1324 }
1325 }
1326 if (p != NULL) {
1327 #ifndef USDT2
1328 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1329 #else /* USDT2 */
1330 HOTSPOT_THREAD_UNPARK(
1331 (uintptr_t) p);
1332 #endif /* USDT2 */
1333 p->unpark();
1334 }
1335 UNSAFE_END
1336
1337 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1338 UnsafeWrapper("Unsafe_Loadavg");
1339 const int max_nelem = 3;
1340 double la[max_nelem];
1341 jint ret;
1342
1343 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1344 assert(a->is_typeArray(), "must be type array");
1345
1346 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1347 ThreadToNativeFromVM ttnfv(thread);
1348 throw_new(env, "ArrayIndexOutOfBoundsException");
1349 return -1;
1350 }
1351
1352 ret = os::loadavg(la, nelem);
1353 if (ret == -1) return -1;
1354
1355 // if successful, ret is the number of samples actually retrieved.
1356 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1357 switch(ret) {
1358 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1359 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1360 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1361 }
1362 return ret;
1363 UNSAFE_END
1364
1365 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1366 UnsafeWrapper("Unsafe_PrefetchRead");
1367 oop p = JNIHandles::resolve(obj);
1368 void* addr = index_oop_from_field_offset_long(p, 0);
1369 Prefetch::read(addr, (intx)offset);
1370 UNSAFE_END
1371
1372 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1373 UnsafeWrapper("Unsafe_PrefetchWrite");
1374 oop p = JNIHandles::resolve(obj);
1375 void* addr = index_oop_from_field_offset_long(p, 0);
1376 Prefetch::write(addr, (intx)offset);
1377 UNSAFE_END
1378
1379
1380 /// JVM_RegisterUnsafeMethods
1381
1382 #define ADR "J"
1383
1384 #define LANG "Ljava/lang/"
1385
1386 #define OBJ LANG "Object;"
1387 #define CLS LANG "Class;"
1388 #define CTR LANG "reflect/Constructor;"
1389 #define FLD LANG "reflect/Field;"
1390 #define MTH LANG "reflect/Method;"
1391 #define THR LANG "Throwable;"
1392
1393 #define DC0_Args LANG "String;[BII"
1394 #define DC_Args DC0_Args LANG "ClassLoader;" "Ljava/security/ProtectionDomain;"
1395
1396 #define CC (char*) /*cast a literal from (const char*)*/
1397 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1398
1399 // define deprecated accessors for compabitility with 1.4.0
1400 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1401 {CC "get" #Boolean, CC "(" OBJ "I)" #Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1402 {CC "put" #Boolean, CC "(" OBJ "I" #Z ")V", FN_PTR(Unsafe_Set##Boolean##140)}
1403
1404 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1405 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1406 {CC "get" #Boolean, CC "(" OBJ "J)" #Z, FN_PTR(Unsafe_Get##Boolean)}, \
1407 {CC "put" #Boolean, CC "(" OBJ "J" #Z ")V", FN_PTR(Unsafe_Set##Boolean)}
1408
1409 // Note: In 1.5.0, there are volatile versions too
1410 #define DECLARE_GETSETOOP(Boolean, Z) \
1411 {CC "get" #Boolean, CC "(" OBJ "J)" #Z, FN_PTR(Unsafe_Get##Boolean)}, \
1412 {CC "put" #Boolean, CC "(" OBJ "J" #Z ")V", FN_PTR(Unsafe_Set##Boolean)}, \
1413 {CC "get" #Boolean "Volatile", CC "(" OBJ "J)" #Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1414 {CC "put" #Boolean "Volatile", CC "(" OBJ "J" #Z ")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1415
1416
1417 #define DECLARE_GETSETNATIVE(Byte, B) \
1418 {CC "get" #Byte, CC "(" ADR ")" #B, FN_PTR(Unsafe_GetNative##Byte)}, \
1419 {CC "put" #Byte, CC "(" ADR#B ")V", FN_PTR(Unsafe_SetNative##Byte)}
1420
1421
1422
1423 // These are the methods for 1.4.0
1424 static JNINativeMethod methods_140[] = {
1425 {CC "getObject", CC "(" OBJ "I)" OBJ "", FN_PTR(Unsafe_GetObject140)},
1426 {CC "putObject", CC "(" OBJ "I" OBJ ")V", FN_PTR(Unsafe_SetObject140)},
1427
1428 DECLARE_GETSETOOP_140(Boolean, Z),
1429 DECLARE_GETSETOOP_140(Byte, B),
1430 DECLARE_GETSETOOP_140(Short, S),
1431 DECLARE_GETSETOOP_140(Char, C),
1432 DECLARE_GETSETOOP_140(Int, I),
1433 DECLARE_GETSETOOP_140(Long, J),
1434 DECLARE_GETSETOOP_140(Float, F),
1435 DECLARE_GETSETOOP_140(Double, D),
1436
1437 DECLARE_GETSETNATIVE(Byte, B),
1438 DECLARE_GETSETNATIVE(Short, S),
1439 DECLARE_GETSETNATIVE(Char, C),
1440 DECLARE_GETSETNATIVE(Int, I),
1441 DECLARE_GETSETNATIVE(Long, J),
1442 DECLARE_GETSETNATIVE(Float, F),
1443 DECLARE_GETSETNATIVE(Double, D),
1444
1445 {CC "getAddress", CC "(" ADR ")" ADR, FN_PTR(Unsafe_GetNativeAddress)},
1446 {CC "putAddress", CC "(" ADR "" ADR ")V", FN_PTR(Unsafe_SetNativeAddress)},
1447
1448 {CC "allocateMemory", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory)},
1449 {CC "reallocateMemory", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory)},
1450 {CC "freeMemory", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory)},
1451
1452 {CC "fieldOffset", CC "(" FLD ")I", FN_PTR(Unsafe_FieldOffset)},
1453 {CC "staticFieldBase", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)},
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 // These are the methods prior to the JSR 166 changes in 1.5.0
1469 static JNINativeMethod methods_141[] = {
1470 {CC "getObject", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObject)},
1471 {CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObject)},
1472
1473 DECLARE_GETSETOOP_141(Boolean, Z),
1474 DECLARE_GETSETOOP_141(Byte, B),
1475 DECLARE_GETSETOOP_141(Short, S),
1476 DECLARE_GETSETOOP_141(Char, C),
1477 DECLARE_GETSETOOP_141(Int, I),
1478 DECLARE_GETSETOOP_141(Long, J),
1479 DECLARE_GETSETOOP_141(Float, F),
1480 DECLARE_GETSETOOP_141(Double, D),
1481
1482 DECLARE_GETSETNATIVE(Byte, B),
1483 DECLARE_GETSETNATIVE(Short, S),
1484 DECLARE_GETSETNATIVE(Char, C),
1485 DECLARE_GETSETNATIVE(Int, I),
1486 DECLARE_GETSETNATIVE(Long, J),
1487 DECLARE_GETSETNATIVE(Float, F),
1488 DECLARE_GETSETNATIVE(Double, D),
1489
1490 {CC "getAddress", CC "(" ADR ")" ADR, FN_PTR(Unsafe_GetNativeAddress)},
1491 {CC "putAddress", CC "(" ADR "" ADR ")V", FN_PTR(Unsafe_SetNativeAddress)},
1492
1493 {CC "allocateMemory", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory)},
1494 {CC "reallocateMemory", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory)},
1495 {CC "freeMemory", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory)},
1496
1497 {CC "objectFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1498 {CC "staticFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset)},
1499 {CC "staticFieldBase", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1500 {CC "ensureClassInitialized",CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1501 {CC "arrayBaseOffset", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1502 {CC "arrayIndexScale", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale)},
1503 {CC "addressSize", CC "()I", FN_PTR(Unsafe_AddressSize)},
1504 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1505
1506 {CC "defineClass", CC "(" DC0_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)},
1507 {CC "defineClass", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass)},
1508 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1509 {CC "monitorEnter", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorEnter)},
1510 {CC "monitorExit", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorExit)},
1511 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)}
1512
1513 };
1514
1515 // These are the methods prior to the JSR 166 changes in 1.6.0
1516 static JNINativeMethod methods_15[] = {
1517 {CC "getObject", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObject)},
1518 {CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObject)},
1519 {CC "getObjectVolatile",CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObjectVolatile)},
1520 {CC "putObjectVolatile",CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1521
1522
1523 DECLARE_GETSETOOP(Boolean, Z),
1524 DECLARE_GETSETOOP(Byte, B),
1525 DECLARE_GETSETOOP(Short, S),
1526 DECLARE_GETSETOOP(Char, C),
1527 DECLARE_GETSETOOP(Int, I),
1528 DECLARE_GETSETOOP(Long, J),
1529 DECLARE_GETSETOOP(Float, F),
1530 DECLARE_GETSETOOP(Double, D),
1531
1532 DECLARE_GETSETNATIVE(Byte, B),
1533 DECLARE_GETSETNATIVE(Short, S),
1534 DECLARE_GETSETNATIVE(Char, C),
1535 DECLARE_GETSETNATIVE(Int, I),
1536 DECLARE_GETSETNATIVE(Long, J),
1537 DECLARE_GETSETNATIVE(Float, F),
1538 DECLARE_GETSETNATIVE(Double, D),
1539
1540 {CC "getAddress", CC "(" ADR ")" ADR, FN_PTR(Unsafe_GetNativeAddress)},
1541 {CC "putAddress", CC "(" ADR "" ADR ")V", FN_PTR(Unsafe_SetNativeAddress)},
1542
1543 {CC "allocateMemory", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory)},
1544 {CC "reallocateMemory", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory)},
1545 {CC "freeMemory", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory)},
1546
1547 {CC "objectFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1548 {CC "staticFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset)},
1549 {CC "staticFieldBase", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1550 {CC "ensureClassInitialized",CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1551 {CC "arrayBaseOffset", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1552 {CC "arrayIndexScale", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale)},
1553 {CC "addressSize", CC "()I", FN_PTR(Unsafe_AddressSize)},
1554 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1555
1556 {CC "defineClass", CC "(" DC0_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)},
1557 {CC "defineClass", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass)},
1558 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1559 {CC "monitorEnter", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorEnter)},
1560 {CC "monitorExit", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorExit)},
1561 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)},
1562 {CC "compareAndSwapObject", CC "(" OBJ "J" OBJ "" OBJ ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1563 {CC "compareAndSwapInt", CC "(" OBJ "J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1564 {CC "compareAndSwapLong", CC "(" OBJ "J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1565 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)},
1566 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)}
1567
1568 };
1569
1570 // These are the methods for 1.6.0 and 1.7.0
1571 static JNINativeMethod methods_16[] = {
1572 {CC "getObject", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObject)},
1573 {CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObject)},
1574 {CC "getObjectVolatile",CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObjectVolatile)},
1575 {CC "putObjectVolatile",CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1576
1577 DECLARE_GETSETOOP(Boolean, Z),
1578 DECLARE_GETSETOOP(Byte, B),
1579 DECLARE_GETSETOOP(Short, S),
1580 DECLARE_GETSETOOP(Char, C),
1581 DECLARE_GETSETOOP(Int, I),
1582 DECLARE_GETSETOOP(Long, J),
1583 DECLARE_GETSETOOP(Float, F),
1584 DECLARE_GETSETOOP(Double, D),
1585
1586 DECLARE_GETSETNATIVE(Byte, B),
1587 DECLARE_GETSETNATIVE(Short, S),
1588 DECLARE_GETSETNATIVE(Char, C),
1589 DECLARE_GETSETNATIVE(Int, I),
1590 DECLARE_GETSETNATIVE(Long, J),
1591 DECLARE_GETSETNATIVE(Float, F),
1592 DECLARE_GETSETNATIVE(Double, D),
1593
1594 {CC "getAddress", CC "(" ADR ")" ADR, FN_PTR(Unsafe_GetNativeAddress)},
1595 {CC "putAddress", CC "(" ADR "" ADR ")V", FN_PTR(Unsafe_SetNativeAddress)},
1596
1597 {CC "allocateMemory", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory)},
1598 {CC "reallocateMemory", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory)},
1599 {CC "freeMemory", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory)},
1600
1601 {CC "objectFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1602 {CC "staticFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset)},
1603 {CC "staticFieldBase", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1604 {CC "ensureClassInitialized",CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1605 {CC "arrayBaseOffset", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1606 {CC "arrayIndexScale", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale)},
1607 {CC "addressSize", CC "()I", FN_PTR(Unsafe_AddressSize)},
1608 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1609
1610 {CC "defineClass", CC "(" DC0_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)},
1611 {CC "defineClass", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass)},
1612 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1613 {CC "monitorEnter", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorEnter)},
1614 {CC "monitorExit", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorExit)},
1615 {CC "tryMonitorEnter", CC "(" OBJ ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1616 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)},
1617 {CC "compareAndSwapObject", CC "(" OBJ "J" OBJ "" OBJ ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1618 {CC "compareAndSwapInt", CC "(" OBJ "J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1619 {CC "compareAndSwapLong", CC "(" OBJ "J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1620 {CC "putOrderedObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetOrderedObject)},
1621 {CC "putOrderedInt", CC "(" OBJ "JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1622 {CC "putOrderedLong", CC "(" OBJ "JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1623 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)},
1624 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)}
1625 };
1626
1627 // These are the methods for 1.8.0
1628 static JNINativeMethod methods_18[] = {
1629 {CC "getObject", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObject)},
1630 {CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObject)},
1631 {CC "getObjectVolatile",CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObjectVolatile)},
1632 {CC "putObjectVolatile",CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1633
1634 DECLARE_GETSETOOP(Boolean, Z),
1635 DECLARE_GETSETOOP(Byte, B),
1636 DECLARE_GETSETOOP(Short, S),
1637 DECLARE_GETSETOOP(Char, C),
1638 DECLARE_GETSETOOP(Int, I),
1639 DECLARE_GETSETOOP(Long, J),
1640 DECLARE_GETSETOOP(Float, F),
1641 DECLARE_GETSETOOP(Double, D),
1642
1643 DECLARE_GETSETNATIVE(Byte, B),
1644 DECLARE_GETSETNATIVE(Short, S),
1645 DECLARE_GETSETNATIVE(Char, C),
1646 DECLARE_GETSETNATIVE(Int, I),
1647 DECLARE_GETSETNATIVE(Long, J),
1648 DECLARE_GETSETNATIVE(Float, F),
1649 DECLARE_GETSETNATIVE(Double, D),
1650
1651 {CC "getAddress", CC "(" ADR ")" ADR, FN_PTR(Unsafe_GetNativeAddress)},
1652 {CC "putAddress", CC "(" ADR "" ADR ")V", FN_PTR(Unsafe_SetNativeAddress)},
1653
1654 {CC "allocateMemory", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory)},
1655 {CC "reallocateMemory", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory)},
1656 {CC "freeMemory", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory)},
1657
1658 {CC "objectFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1659 {CC "staticFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset)},
1660 {CC "staticFieldBase", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1661 {CC "ensureClassInitialized",CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1662 {CC "arrayBaseOffset", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1663 {CC "arrayIndexScale", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale)},
1664 {CC "addressSize", CC "()I", FN_PTR(Unsafe_AddressSize)},
1665 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1666
1667 {CC "defineClass", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass)},
1668 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1669 {CC "monitorEnter", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorEnter)},
1670 {CC "monitorExit", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorExit)},
1671 {CC "tryMonitorEnter", CC "(" OBJ ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1672 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)},
1673 {CC "compareAndSwapObject", CC "(" OBJ "J" OBJ "" OBJ ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1674 {CC "compareAndSwapInt", CC "(" OBJ "J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1675 {CC "compareAndSwapLong", CC "(" OBJ "J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1676 {CC "putOrderedObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetOrderedObject)},
1677 {CC "putOrderedInt", CC "(" OBJ "JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1678 {CC "putOrderedLong", CC "(" OBJ "JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1679 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)},
1680 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)}
1681 };
1682
1683 JNINativeMethod loadavg_method[] = {
1684 {CC "getLoadAverage", CC "([DI)I", FN_PTR(Unsafe_Loadavg)}
1685 };
1686
1687 JNINativeMethod prefetch_methods[] = {
1688 {CC "prefetchRead", CC "(" OBJ "J)V", FN_PTR(Unsafe_PrefetchRead)},
1689 {CC "prefetchWrite", CC "(" OBJ "J)V", FN_PTR(Unsafe_PrefetchWrite)},
1690 {CC "prefetchReadStatic", CC "(" OBJ "J)V", FN_PTR(Unsafe_PrefetchRead)},
1691 {CC "prefetchWriteStatic",CC "(" OBJ "J)V", FN_PTR(Unsafe_PrefetchWrite)}
1692 };
1693
1694 JNINativeMethod memcopy_methods_17[] = {
1695 {CC "copyMemory", CC "(" OBJ "J" OBJ "JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1696 {CC "setMemory", CC "(" OBJ "JJB)V", FN_PTR(Unsafe_SetMemory2)}
1697 };
1698
1699 JNINativeMethod memcopy_methods_15[] = {
1700 {CC "setMemory", CC "(" ADR "JB)V", FN_PTR(Unsafe_SetMemory)},
1701 {CC "copyMemory", CC "(" ADR ADR "J)V", FN_PTR(Unsafe_CopyMemory)}
1702 };
1703
1704 JNINativeMethod anonk_methods[] = {
1705 {CC "defineAnonymousClass", CC "(" DAC_Args ")" CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1706 };
1707
1708 JNINativeMethod lform_methods[] = {
1709 {CC "shouldBeInitialized",CC "(" CLS ")Z", FN_PTR(Unsafe_ShouldBeInitialized)},
1710 };
1711
1712 JNINativeMethod fence_methods[] = {
1713 {CC "loadFence", CC "()V", FN_PTR(Unsafe_LoadFence)},
1714 {CC "storeFence", CC "()V", FN_PTR(Unsafe_StoreFence)},
1715 {CC "fullFence", CC "()V", FN_PTR(Unsafe_FullFence)},
1716 };
1717
1718 #undef CC
1719 #undef FN_PTR
1720
1721 #undef ADR
1722 #undef LANG
1723 #undef OBJ
1724 #undef CLS
1725 #undef CTR
1726 #undef FLD
1727 #undef MTH
1728 #undef THR
1729 #undef DC0_Args
1730 #undef DC_Args
1731
1732 #undef DECLARE_GETSETOOP
1733 #undef DECLARE_GETSETNATIVE
1734
1735
1736 /**
1737 * Helper method to register native methods.
1738 */
1739 static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1740 int status = env->RegisterNatives(clazz, methods, nMethods);
1741 if (status < 0 || env->ExceptionOccurred()) {
1742 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1743 tty->print_cr("Unsafe: failed registering %s", message);
1744 }
1745 env->ExceptionClear();
1746 return false;
1747 } else {
1748 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1749 tty->print_cr("Unsafe: successfully registered %s", message);
1750 }
1751 return true;
1752 }
1753 }
1754
1755
1756 // This one function is exported, used by NativeLookup.
1757 // The Unsafe_xxx functions above are called only from the interpreter.
1758 // The optimizer looks at names and signatures to recognize
1759 // individual functions.
1760
1761 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1762 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1763 {
1764 ThreadToNativeFromVM ttnfv(thread);
1765
1766 // Unsafe methods
1767 {
1768 bool success = false;
1769 // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6
1770 if (!success) {
1771 success = register_natives("1.6 methods", env, unsafecls, methods_16, sizeof(methods_16)/sizeof(JNINativeMethod));
1772 }
1773 if (!success) {
1774 success = register_natives("1.8 methods", env, unsafecls, methods_18, sizeof(methods_18)/sizeof(JNINativeMethod));
1775 }
1776 if (!success) {
1777 success = register_natives("1.5 methods", env, unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1778 }
1779 if (!success) {
1780 success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1781 }
1782 if (!success) {
1783 success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1784 }
1785 guarantee(success, "register unsafe natives");
1786 }
1787
1788 // Unsafe.getLoadAverage
1789 register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1790
1791 // Prefetch methods
1792 register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1793
1794 // Memory copy methods
1795 {
1796 bool success = false;
1797 if (!success) {
1798 success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod));
1799 }
1800 if (!success) {
1801 success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1802 }
1803 }
1804
1805 // Unsafe.defineAnonymousClass
1806 if (EnableInvokeDynamic) {
1807 register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1808 }
1809
1810 // Unsafe.shouldBeInitialized
1811 if (EnableInvokeDynamic) {
1812 register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod));
1813 }
1814
1815 // Fence methods
1816 register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod));
1817 }
1818 JVM_END