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 #if INCLUDE_JFR
32 #include "jfr/jfrEvents.hpp"
33 #endif
34 #include "memory/allocation.inline.hpp"
35 #include "prims/jni.h"
36 #include "prims/jvm.h"
37 #include "runtime/globals.hpp"
38 #include "runtime/interfaceSupport.hpp"
39 #include "runtime/prefetch.inline.hpp"
40 #include "runtime/orderAccess.inline.hpp"
41 #include "runtime/reflection.hpp"
42 #include "runtime/synchronizer.hpp"
43 #include "services/threadService.hpp"
44 #include "utilities/copy.hpp"
45 #include "utilities/dtrace.hpp"
46
47 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
48
49 /*
50 * Implementation of class sun.misc.Unsafe
51 */
52
53 #ifndef USDT2
54 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long);
55 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t);
56 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t);
57 #endif /* !USDT2 */
58
59 #define MAX_OBJECT_SIZE \
60 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
61 + ((julong)max_jint * sizeof(double)) )
62
63
64 #define UNSAFE_ENTRY(result_type, header) \
65 JVM_ENTRY(result_type, header)
66
67 // Can't use UNSAFE_LEAF because it has the signature of a straight
68 // call into the runtime (just like JVM_LEAF, funny that) but it's
69 // called like a Java Native and thus the wrapper built for it passes
70 // arguments like a JNI call. It expects those arguments to be popped
71 // from the stack on Intel like all good JNI args are, and adjusts the
72 // stack according. Since the JVM_LEAF call expects no extra
73 // arguments the stack isn't popped in the C code, is pushed by the
74 // wrapper and we get sick.
75 //#define UNSAFE_LEAF(result_type, header) \
76 // JVM_LEAF(result_type, header)
77
78 #define UNSAFE_END JVM_END
79
80 #define UnsafeWrapper(arg) /*nothing, for the present*/
81
82
83 inline void* addr_from_java(jlong addr) {
84 // This assert fails in a variety of ways on 32-bit systems.
85 // It is impossible to predict whether native code that converts
86 // pointers to longs will sign-extend or zero-extend the addresses.
87 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
88 return (void*)(uintptr_t)addr;
89 }
90
91 inline jlong addr_to_java(void* p) {
92 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
93 return (uintptr_t)p;
94 }
95
96
97 // Note: The VM's obj_field and related accessors use byte-scaled
98 // ("unscaled") offsets, just as the unsafe methods do.
99
100 // However, the method Unsafe.fieldOffset explicitly declines to
101 // guarantee this. The field offset values manipulated by the Java user
102 // through the Unsafe API are opaque cookies that just happen to be byte
103 // offsets. We represent this state of affairs by passing the cookies
104 // through conversion functions when going between the VM and the Unsafe API.
105 // The conversion functions just happen to be no-ops at present.
106
107 inline jlong field_offset_to_byte_offset(jlong field_offset) {
108 return field_offset;
109 }
110
111 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
112 return byte_offset;
113 }
114
115 inline jint invocation_key_from_method_slot(jint slot) {
116 return slot;
117 }
118
119 inline jint invocation_key_to_method_slot(jint key) {
120 return key;
121 }
122
123 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
124 jlong byte_offset = field_offset_to_byte_offset(field_offset);
125 #ifdef ASSERT
126 if (p != NULL) {
127 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
128 if (byte_offset == (jint)byte_offset) {
129 void* ptr_plus_disp = (address)p + byte_offset;
130 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
131 "raw [ptr+disp] must be consistent with oop::field_base");
132 }
133 jlong p_size = HeapWordSize * (jlong)(p->size());
134 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size));
135 }
136 #endif
137 if (sizeof(char*) == sizeof(jint)) // (this constant folds!)
138 return (address)p + (jint) byte_offset;
139 else
140 return (address)p + byte_offset;
141 }
142
143 // Externally callable versions:
144 // (Use these in compiler intrinsics which emulate unsafe primitives.)
145 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
146 return field_offset;
147 }
148 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
149 return byte_offset;
150 }
151 jint Unsafe_invocation_key_from_method_slot(jint slot) {
152 return invocation_key_from_method_slot(slot);
153 }
154 jint Unsafe_invocation_key_to_method_slot(jint key) {
155 return invocation_key_to_method_slot(key);
156 }
157
158
159 ///// Data in the Java heap.
160
161 #define truncate_jboolean(x) ((x) & 1)
162 #define truncate_jbyte(x) (x)
163 #define truncate_jshort(x) (x)
164 #define truncate_jchar(x) (x)
165 #define truncate_jint(x) (x)
166 #define truncate_jlong(x) (x)
167 #define truncate_jfloat(x) (x)
168 #define truncate_jdouble(x) (x)
169
170 #define GET_FIELD(obj, offset, type_name, v) \
171 oop p = JNIHandles::resolve(obj); \
172 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
173
174 #define SET_FIELD(obj, offset, type_name, x) \
175 oop p = JNIHandles::resolve(obj); \
176 *(type_name*)index_oop_from_field_offset_long(p, offset) = truncate_##type_name(x)
177
178 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
179 oop p = JNIHandles::resolve(obj); \
180 if (support_IRIW_for_not_multiple_copy_atomic_cpu) { \
181 OrderAccess::fence(); \
182 } \
183 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
184
185 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
186 oop p = JNIHandles::resolve(obj); \
187 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), truncate_##type_name(x));
188
189 // Macros for oops that check UseCompressedOops
190
191 #define GET_OOP_FIELD(obj, offset, v) \
192 oop p = JNIHandles::resolve(obj); \
193 oop v; \
194 if (UseCompressedOops) { \
195 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
196 v = oopDesc::decode_heap_oop(n); \
197 } else { \
198 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
199 }
200
201
202 // Get/SetObject must be special-cased, since it works with handles.
203
204 // We could be accessing the referent field in a reference
205 // object. If G1 is enabled then we need to register non-null
206 // referent with the SATB barrier.
207
208 #if INCLUDE_ALL_GCS
209 static bool is_java_lang_ref_Reference_access(oop o, jlong offset) {
210 if (offset == java_lang_ref_Reference::referent_offset && o != NULL) {
211 Klass* k = o->klass();
212 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
213 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
214 return true;
215 }
216 }
217 return false;
218 }
219 #endif
220
221 static void ensure_satb_referent_alive(oop o, jlong offset, oop v) {
222 #if INCLUDE_ALL_GCS
223 if (UseG1GC && v != NULL && is_java_lang_ref_Reference_access(o, offset)) {
224 G1SATBCardTableModRefBS::enqueue(v);
225 }
226 #endif
227 }
228
229 // The xxx140 variants for backward compatibility do not allow a full-width offset.
230 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
231 UnsafeWrapper("Unsafe_GetObject");
232 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
233 GET_OOP_FIELD(obj, offset, v)
234
235 ensure_satb_referent_alive(p, offset, v);
236
237 return JNIHandles::make_local(env, v);
238 UNSAFE_END
239
240 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
241 UnsafeWrapper("Unsafe_SetObject");
242 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
243 oop x = JNIHandles::resolve(x_h);
244 //SET_FIELD(obj, offset, oop, x);
245 oop p = JNIHandles::resolve(obj);
246 if (UseCompressedOops) {
247 if (x != NULL) {
248 // If there is a heap base pointer, we are obliged to emit a store barrier.
249 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
250 } else {
251 narrowOop n = oopDesc::encode_heap_oop_not_null(x);
252 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
253 }
254 } else {
255 if (x != NULL) {
256 // If there is a heap base pointer, we are obliged to emit a store barrier.
257 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
258 } else {
259 *(oop*)index_oop_from_field_offset_long(p, offset) = x;
260 }
261 }
262 UNSAFE_END
263
264 // The normal variants allow a null base pointer with an arbitrary address.
265 // But if the base pointer is non-null, the offset should make some sense.
266 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
267 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
268 UnsafeWrapper("Unsafe_GetObject");
269 GET_OOP_FIELD(obj, offset, v)
270
271 ensure_satb_referent_alive(p, offset, v);
272
273 return JNIHandles::make_local(env, v);
274 UNSAFE_END
275
276 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
277 UnsafeWrapper("Unsafe_SetObject");
278 oop x = JNIHandles::resolve(x_h);
279 oop p = JNIHandles::resolve(obj);
280 if (UseCompressedOops) {
281 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
282 } else {
283 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
284 }
285 UNSAFE_END
286
287 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
288 UnsafeWrapper("Unsafe_GetObjectVolatile");
289 oop p = JNIHandles::resolve(obj);
290 void* addr = index_oop_from_field_offset_long(p, offset);
291 volatile oop v;
292 if (UseCompressedOops) {
293 volatile narrowOop n = *(volatile narrowOop*) addr;
294 (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n));
295 } else {
296 (void)const_cast<oop&>(v = *(volatile oop*) addr);
297 }
298
299 ensure_satb_referent_alive(p, offset, v);
300
301 OrderAccess::acquire();
302 return JNIHandles::make_local(env, v);
303 UNSAFE_END
304
305 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
306 UnsafeWrapper("Unsafe_SetObjectVolatile");
307 oop x = JNIHandles::resolve(x_h);
308 oop p = JNIHandles::resolve(obj);
309 void* addr = index_oop_from_field_offset_long(p, offset);
310 OrderAccess::release();
311 if (UseCompressedOops) {
312 oop_store((narrowOop*)addr, x);
313 } else {
314 oop_store((oop*)addr, x);
315 }
316 OrderAccess::fence();
317 UNSAFE_END
318
319 #ifndef SUPPORTS_NATIVE_CX8
320
321 // VM_Version::supports_cx8() is a surrogate for 'supports atomic long memory ops'.
322 //
323 // On platforms which do not support atomic compare-and-swap of jlong (8 byte)
324 // values we have to use a lock-based scheme to enforce atomicity. This has to be
325 // applied to all Unsafe operations that set the value of a jlong field. Even so
326 // the compareAndSwapLong operation will not be atomic with respect to direct stores
327 // to the field from Java code. It is important therefore that any Java code that
328 // utilizes these Unsafe jlong operations does not perform direct stores. To permit
329 // direct loads of the field from Java code we must also use Atomic::store within the
330 // locked regions. And for good measure, in case there are direct stores, we also
331 // employ Atomic::load within those regions. Note that the field in question must be
332 // volatile and so must have atomic load/store accesses applied at the Java level.
333 //
334 // The locking scheme could utilize a range of strategies for controlling the locking
335 // granularity: from a lock per-field through to a single global lock. The latter is
336 // the simplest and is used for the current implementation. Note that the Java object
337 // that contains the field, can not, in general, be used for locking. To do so can lead
338 // to deadlocks as we may introduce locking into what appears to the Java code to be a
339 // lock-free path.
340 //
341 // As all the locked-regions are very short and themselves non-blocking we can treat
342 // them as leaf routines and elide safepoint checks (ie we don't perform any thread
343 // state transitions even when blocking for the lock). Note that if we do choose to
344 // add safepoint checks and thread state transitions, we must ensure that we calculate
345 // the address of the field _after_ we have acquired the lock, else the object may have
346 // been moved by the GC
347
348 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
349 UnsafeWrapper("Unsafe_GetLongVolatile");
350 {
351 if (VM_Version::supports_cx8()) {
352 GET_FIELD_VOLATILE(obj, offset, jlong, v);
353 return v;
354 }
355 else {
356 Handle p (THREAD, JNIHandles::resolve(obj));
357 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
358 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
359 jlong value = Atomic::load(addr);
360 return value;
361 }
362 }
363 UNSAFE_END
364
365 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
366 UnsafeWrapper("Unsafe_SetLongVolatile");
367 {
368 if (VM_Version::supports_cx8()) {
369 SET_FIELD_VOLATILE(obj, offset, jlong, x);
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 Atomic::store(x, addr);
376 }
377 }
378 UNSAFE_END
379
380 #endif // not SUPPORTS_NATIVE_CX8
381
382 #define DEFINE_GETSETOOP(jboolean, Boolean) \
383 \
384 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
385 UnsafeWrapper("Unsafe_Get"#Boolean); \
386 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
387 GET_FIELD(obj, offset, jboolean, v); \
388 return v; \
389 UNSAFE_END \
390 \
391 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
392 UnsafeWrapper("Unsafe_Set"#Boolean); \
393 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
394 SET_FIELD(obj, offset, jboolean, x); \
395 UNSAFE_END \
396 \
397 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
398 UnsafeWrapper("Unsafe_Get"#Boolean); \
399 GET_FIELD(obj, offset, jboolean, v); \
400 return v; \
401 UNSAFE_END \
402 \
403 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
404 UnsafeWrapper("Unsafe_Set"#Boolean); \
405 SET_FIELD(obj, offset, jboolean, x); \
406 UNSAFE_END \
407 \
408 // END DEFINE_GETSETOOP.
409
410 DEFINE_GETSETOOP(jboolean, Boolean)
411 DEFINE_GETSETOOP(jbyte, Byte)
412 DEFINE_GETSETOOP(jshort, Short);
413 DEFINE_GETSETOOP(jchar, Char);
414 DEFINE_GETSETOOP(jint, Int);
415 DEFINE_GETSETOOP(jlong, Long);
416 DEFINE_GETSETOOP(jfloat, Float);
417 DEFINE_GETSETOOP(jdouble, Double);
418
419 #undef DEFINE_GETSETOOP
420
421 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
422 \
423 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
424 UnsafeWrapper("Unsafe_Get"#Boolean); \
425 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
426 return v; \
427 UNSAFE_END \
428 \
429 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
430 UnsafeWrapper("Unsafe_Set"#Boolean); \
431 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
432 UNSAFE_END \
433 \
434 // END DEFINE_GETSETOOP_VOLATILE.
435
436 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
437 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
438 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
439 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
440 DEFINE_GETSETOOP_VOLATILE(jint, Int);
441 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
442 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
443
444 #ifdef SUPPORTS_NATIVE_CX8
445 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
446 #endif
447
448 #undef DEFINE_GETSETOOP_VOLATILE
449
450 // The non-intrinsified versions of setOrdered just use setVolatile
451
452 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
453 UnsafeWrapper("Unsafe_SetOrderedInt");
454 SET_FIELD_VOLATILE(obj, offset, jint, x);
455 UNSAFE_END
456
457 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
458 UnsafeWrapper("Unsafe_SetOrderedObject");
459 oop x = JNIHandles::resolve(x_h);
460 oop p = JNIHandles::resolve(obj);
461 void* addr = index_oop_from_field_offset_long(p, offset);
462 OrderAccess::release();
463 if (UseCompressedOops) {
464 oop_store((narrowOop*)addr, x);
465 } else {
466 oop_store((oop*)addr, x);
467 }
468 OrderAccess::fence();
469 UNSAFE_END
470
471 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
472 UnsafeWrapper("Unsafe_SetOrderedLong");
473 #ifdef SUPPORTS_NATIVE_CX8
474 SET_FIELD_VOLATILE(obj, offset, jlong, x);
475 #else
476 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
477 {
478 if (VM_Version::supports_cx8()) {
479 SET_FIELD_VOLATILE(obj, offset, jlong, x);
480 }
481 else {
482 Handle p (THREAD, JNIHandles::resolve(obj));
483 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
484 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
485 Atomic::store(x, addr);
486 }
487 }
488 #endif
489 UNSAFE_END
490
491 UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe))
492 UnsafeWrapper("Unsafe_LoadFence");
493 OrderAccess::acquire();
494 UNSAFE_END
495
496 UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe))
497 UnsafeWrapper("Unsafe_StoreFence");
498 OrderAccess::release();
499 UNSAFE_END
500
501 UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe))
502 UnsafeWrapper("Unsafe_FullFence");
503 OrderAccess::fence();
504 UNSAFE_END
505
506 ////// Data in the C heap.
507
508 // Note: These do not throw NullPointerException for bad pointers.
509 // They just crash. Only a oop base pointer can generate a NullPointerException.
510 //
511 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
512 \
513 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
514 UnsafeWrapper("Unsafe_GetNative"#Type); \
515 void* p = addr_from_java(addr); \
516 JavaThread* t = JavaThread::current(); \
517 t->set_doing_unsafe_access(true); \
518 java_type x = *(volatile native_type*)p; \
519 t->set_doing_unsafe_access(false); \
520 return x; \
521 UNSAFE_END \
522 \
523 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
524 UnsafeWrapper("Unsafe_SetNative"#Type); \
525 JavaThread* t = JavaThread::current(); \
526 t->set_doing_unsafe_access(true); \
527 void* p = addr_from_java(addr); \
528 *(volatile native_type*)p = x; \
529 t->set_doing_unsafe_access(false); \
530 UNSAFE_END \
531 \
532 // END DEFINE_GETSETNATIVE.
533
534 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
535 DEFINE_GETSETNATIVE(jshort, Short, signed short);
536 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
537 DEFINE_GETSETNATIVE(jint, Int, jint);
538 // no long -- handled specially
539 DEFINE_GETSETNATIVE(jfloat, Float, float);
540 DEFINE_GETSETNATIVE(jdouble, Double, double);
541
542 #undef DEFINE_GETSETNATIVE
543
544 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
545 UnsafeWrapper("Unsafe_GetNativeLong");
546 JavaThread* t = JavaThread::current();
547 // We do it this way to avoid problems with access to heap using 64
548 // bit loads, as jlong in heap could be not 64-bit aligned, and on
549 // some CPUs (SPARC) it leads to SIGBUS.
550 t->set_doing_unsafe_access(true);
551 void* p = addr_from_java(addr);
552 jlong x;
553 if (((intptr_t)p & 7) == 0) {
554 // jlong is aligned, do a volatile access
555 x = *(volatile jlong*)p;
556 } else {
557 jlong_accessor acc;
558 acc.words[0] = ((volatile jint*)p)[0];
559 acc.words[1] = ((volatile jint*)p)[1];
560 x = acc.long_value;
561 }
562 t->set_doing_unsafe_access(false);
563 return x;
564 UNSAFE_END
565
566 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
567 UnsafeWrapper("Unsafe_SetNativeLong");
568 JavaThread* t = JavaThread::current();
569 // see comment for Unsafe_GetNativeLong
570 t->set_doing_unsafe_access(true);
571 void* p = addr_from_java(addr);
572 if (((intptr_t)p & 7) == 0) {
573 // jlong is aligned, do a volatile access
574 *(volatile jlong*)p = x;
575 } else {
576 jlong_accessor acc;
577 acc.long_value = x;
578 ((volatile jint*)p)[0] = acc.words[0];
579 ((volatile jint*)p)[1] = acc.words[1];
580 }
581 t->set_doing_unsafe_access(false);
582 UNSAFE_END
583
584
585 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
586 UnsafeWrapper("Unsafe_GetNativeAddress");
587 void* p = addr_from_java(addr);
588 return addr_to_java(*(void**)p);
589 UNSAFE_END
590
591 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
592 UnsafeWrapper("Unsafe_SetNativeAddress");
593 void* p = addr_from_java(addr);
594 *(void**)p = addr_from_java(x);
595 UNSAFE_END
596
597
598 ////// Allocation requests
599
600 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
601 UnsafeWrapper("Unsafe_AllocateInstance");
602 {
603 ThreadToNativeFromVM ttnfv(thread);
604 return env->AllocObject(cls);
605 }
606 UNSAFE_END
607
608 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
609 UnsafeWrapper("Unsafe_AllocateMemory");
610 size_t sz = (size_t)size;
611 if (sz != (julong)size || size < 0) {
612 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
613 }
614 if (sz == 0) {
615 return 0;
616 }
617 sz = round_to(sz, HeapWordSize);
618 void* x = os::malloc(sz, mtInternal);
619 if (x == NULL) {
620 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
621 }
622 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
623 return addr_to_java(x);
624 UNSAFE_END
625
626 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
627 UnsafeWrapper("Unsafe_ReallocateMemory");
628 void* p = addr_from_java(addr);
629 size_t sz = (size_t)size;
630 if (sz != (julong)size || size < 0) {
631 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
632 }
633 if (sz == 0) {
634 os::free(p);
635 return 0;
636 }
637 sz = round_to(sz, HeapWordSize);
638 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal);
639 if (x == NULL) {
640 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
641 }
642 return addr_to_java(x);
643 UNSAFE_END
644
645 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
646 UnsafeWrapper("Unsafe_FreeMemory");
647 void* p = addr_from_java(addr);
648 if (p == NULL) {
649 return;
650 }
651 os::free(p);
652 UNSAFE_END
653
654 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
655 UnsafeWrapper("Unsafe_SetMemory");
656 size_t sz = (size_t)size;
657 if (sz != (julong)size || size < 0) {
658 THROW(vmSymbols::java_lang_IllegalArgumentException());
659 }
660 char* p = (char*) addr_from_java(addr);
661 Copy::fill_to_memory_atomic(p, sz, value);
662 UNSAFE_END
663
664 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
665 UnsafeWrapper("Unsafe_SetMemory");
666 size_t sz = (size_t)size;
667 if (sz != (julong)size || size < 0) {
668 THROW(vmSymbols::java_lang_IllegalArgumentException());
669 }
670 oop base = JNIHandles::resolve(obj);
671 void* p = index_oop_from_field_offset_long(base, offset);
672 Copy::fill_to_memory_atomic(p, sz, value);
673 UNSAFE_END
674
675 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
676 UnsafeWrapper("Unsafe_CopyMemory");
677 if (size == 0) {
678 return;
679 }
680 size_t sz = (size_t)size;
681 if (sz != (julong)size || size < 0) {
682 THROW(vmSymbols::java_lang_IllegalArgumentException());
683 }
684 void* src = addr_from_java(srcAddr);
685 void* dst = addr_from_java(dstAddr);
686 Copy::conjoint_memory_atomic(src, dst, sz);
687 UNSAFE_END
688
689 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
690 UnsafeWrapper("Unsafe_CopyMemory");
691 if (size == 0) {
692 return;
693 }
694 size_t sz = (size_t)size;
695 if (sz != (julong)size || size < 0) {
696 THROW(vmSymbols::java_lang_IllegalArgumentException());
697 }
698 oop srcp = JNIHandles::resolve(srcObj);
699 oop dstp = JNIHandles::resolve(dstObj);
700 if (dstp != NULL && !dstp->is_typeArray()) {
701 // NYI: This works only for non-oop arrays at present.
702 // Generalizing it would be reasonable, but requires card marking.
703 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
704 THROW(vmSymbols::java_lang_IllegalArgumentException());
705 }
706 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
707 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
708 Copy::conjoint_memory_atomic(src, dst, sz);
709 UNSAFE_END
710
711
712 ////// Random queries
713
714 // See comment at file start about UNSAFE_LEAF
715 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
716 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
717 UnsafeWrapper("Unsafe_AddressSize");
718 return sizeof(void*);
719 UNSAFE_END
720
721 // See comment at file start about UNSAFE_LEAF
722 //UNSAFE_LEAF(jint, Unsafe_PageSize())
723 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
724 UnsafeWrapper("Unsafe_PageSize");
725 return os::vm_page_size();
726 UNSAFE_END
727
728 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
729 if (field == NULL) {
730 THROW_0(vmSymbols::java_lang_NullPointerException());
731 }
732
733 oop reflected = JNIHandles::resolve_non_null(field);
734 oop mirror = java_lang_reflect_Field::clazz(reflected);
735 Klass* k = java_lang_Class::as_Klass(mirror);
736 int slot = java_lang_reflect_Field::slot(reflected);
737 int modifiers = java_lang_reflect_Field::modifiers(reflected);
738
739 if (must_be_static >= 0) {
740 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
741 if (must_be_static != really_is_static) {
742 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
743 }
744 }
745
746 int offset = InstanceKlass::cast(k)->field_offset(slot);
747 return field_offset_from_byte_offset(offset);
748 }
749
750 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
751 UnsafeWrapper("Unsafe_ObjectFieldOffset");
752 return find_field_offset(field, 0, THREAD);
753 UNSAFE_END
754
755 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
756 UnsafeWrapper("Unsafe_StaticFieldOffset");
757 return find_field_offset(field, 1, THREAD);
758 UNSAFE_END
759
760 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
761 UnsafeWrapper("Unsafe_StaticFieldBase");
762 // Note: In this VM implementation, a field address is always a short
763 // offset from the base of a a klass metaobject. Thus, the full dynamic
764 // range of the return type is never used. However, some implementations
765 // might put the static field inside an array shared by many classes,
766 // or even at a fixed address, in which case the address could be quite
767 // large. In that last case, this function would return NULL, since
768 // the address would operate alone, without any base pointer.
769
770 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
771
772 oop reflected = JNIHandles::resolve_non_null(field);
773 oop mirror = java_lang_reflect_Field::clazz(reflected);
774 int modifiers = java_lang_reflect_Field::modifiers(reflected);
775
776 if ((modifiers & JVM_ACC_STATIC) == 0) {
777 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
778 }
779
780 return JNIHandles::make_local(env, mirror);
781 UNSAFE_END
782
783 //@deprecated
784 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
785 UnsafeWrapper("Unsafe_FieldOffset");
786 // tries (but fails) to be polymorphic between static and non-static:
787 jlong offset = find_field_offset(field, -1, THREAD);
788 guarantee(offset == (jint)offset, "offset fits in 32 bits");
789 return (jint)offset;
790 UNSAFE_END
791
792 //@deprecated
793 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
794 UnsafeWrapper("Unsafe_StaticFieldBase");
795 if (clazz == NULL) {
796 THROW_0(vmSymbols::java_lang_NullPointerException());
797 }
798 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
799 UNSAFE_END
800
801 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
802 UnsafeWrapper("Unsafe_EnsureClassInitialized");
803 if (clazz == NULL) {
804 THROW(vmSymbols::java_lang_NullPointerException());
805 }
806 oop mirror = JNIHandles::resolve_non_null(clazz);
807
808 Klass* klass = java_lang_Class::as_Klass(mirror);
809 if (klass != NULL && klass->should_be_initialized()) {
810 InstanceKlass* k = InstanceKlass::cast(klass);
811 k->initialize(CHECK);
812 }
813 }
814 UNSAFE_END
815
816 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
817 UnsafeWrapper("Unsafe_ShouldBeInitialized");
818 if (clazz == NULL) {
819 THROW_(vmSymbols::java_lang_NullPointerException(), false);
820 }
821 oop mirror = JNIHandles::resolve_non_null(clazz);
822 Klass* klass = java_lang_Class::as_Klass(mirror);
823 if (klass != NULL && klass->should_be_initialized()) {
824 return true;
825 }
826 return false;
827 }
828 UNSAFE_END
829
830 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
831 if (acls == NULL) {
832 THROW(vmSymbols::java_lang_NullPointerException());
833 }
834 oop mirror = JNIHandles::resolve_non_null(acls);
835 Klass* k = java_lang_Class::as_Klass(mirror);
836 if (k == NULL || !k->oop_is_array()) {
837 THROW(vmSymbols::java_lang_InvalidClassException());
838 } else if (k->oop_is_objArray()) {
839 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
840 scale = heapOopSize;
841 } else if (k->oop_is_typeArray()) {
842 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
843 base = tak->array_header_in_bytes();
844 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
845 scale = (1 << tak->log2_element_size());
846 } else {
847 ShouldNotReachHere();
848 }
849 }
850
851 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
852 UnsafeWrapper("Unsafe_ArrayBaseOffset");
853 int base = 0, scale = 0;
854 getBaseAndScale(base, scale, acls, CHECK_0);
855 return field_offset_from_byte_offset(base);
856 UNSAFE_END
857
858
859 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
860 UnsafeWrapper("Unsafe_ArrayIndexScale");
861 int base = 0, scale = 0;
862 getBaseAndScale(base, scale, acls, CHECK_0);
863 // This VM packs both fields and array elements down to the byte.
864 // But watch out: If this changes, so that array references for
865 // a given primitive type (say, T_BOOLEAN) use different memory units
866 // than fields, this method MUST return zero for such arrays.
867 // For example, the VM used to store sub-word sized fields in full
868 // words in the object layout, so that accessors like getByte(Object,int)
869 // did not really do what one might expect for arrays. Therefore,
870 // this function used to report a zero scale factor, so that the user
871 // would know not to attempt to access sub-word array elements.
872 // // Code for unpacked fields:
873 // if (scale < wordSize) return 0;
874
875 // The following allows for a pretty general fieldOffset cookie scheme,
876 // but requires it to be linear in byte offset.
877 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
878 UNSAFE_END
879
880
881 static inline void throw_new(JNIEnv *env, const char *ename) {
882 char buf[100];
883 strcpy(buf, "java/lang/");
884 strcat(buf, ename);
885 jclass cls = env->FindClass(buf);
886 if (env->ExceptionCheck()) {
887 env->ExceptionClear();
888 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf);
889 return;
890 }
891 char* msg = NULL;
892 env->ThrowNew(cls, msg);
893 }
894
895 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
896 {
897 // Code lifted from JDK 1.3 ClassLoader.c
898
899 jbyte *body;
900 char *utfName;
901 jclass result = 0;
902 char buf[128];
903
904 if (UsePerfData) {
905 ClassLoader::unsafe_defineClassCallCounter()->inc();
906 }
907
908 if (data == NULL) {
909 throw_new(env, "NullPointerException");
910 return 0;
911 }
912
913 /* Work around 4153825. malloc crashes on Solaris when passed a
914 * negative size.
915 */
916 if (length < 0) {
917 throw_new(env, "ArrayIndexOutOfBoundsException");
918 return 0;
919 }
920
921 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
922
923 if (body == 0) {
924 throw_new(env, "OutOfMemoryError");
925 return 0;
926 }
927
928 env->GetByteArrayRegion(data, offset, length, body);
929
930 if (env->ExceptionOccurred())
931 goto free_body;
932
933 if (name != NULL) {
934 uint len = env->GetStringUTFLength(name);
935 int unicode_len = env->GetStringLength(name);
936 if (len >= sizeof(buf)) {
937 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
938 if (utfName == NULL) {
939 throw_new(env, "OutOfMemoryError");
940 goto free_body;
941 }
942 } else {
943 utfName = buf;
944 }
945 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
946 //VerifyFixClassname(utfName);
947 for (uint i = 0; i < len; i++) {
948 if (utfName[i] == '.') utfName[i] = '/';
949 }
950 } else {
951 utfName = NULL;
952 }
953
954 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
955
956 if (utfName && utfName != buf)
957 FREE_C_HEAP_ARRAY(char, utfName, mtInternal);
958
959 free_body:
960 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal);
961 return result;
962 }
963 }
964
965
966 UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
967 UnsafeWrapper("Unsafe_DefineClass");
968 {
969 ThreadToNativeFromVM ttnfv(thread);
970 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
971 }
972 UNSAFE_END
973
974
975 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
976 UnsafeWrapper("Unsafe_DefineClass");
977 {
978 ThreadToNativeFromVM ttnfv(thread);
979
980 int depthFromDefineClass0 = 1;
981 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
982 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
983 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
984
985 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
986 }
987 UNSAFE_END
988
989
990 #define DAC_Args CLS"[B["OBJ
991 // define a class but do not make it known to the class loader or system dictionary
992 // - host_class: supplies context for linkage, access control, protection domain, and class loader
993 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
994 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
995
996 // When you load an anonymous class U, it works as if you changed its name just before loading,
997 // to a name that you will never use again. Since the name is lost, no other class can directly
998 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
999 // through java.lang.Class methods like Class.newInstance.
1000
1001 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
1002 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
1003 // An anonymous class also has special privileges to access any member of its host class.
1004 // This is the main reason why this loading operation is unsafe. The purpose of this is to
1005 // allow language implementations to simulate "open classes"; a host class in effect gets
1006 // new code when an anonymous class is loaded alongside it. A less convenient but more
1007 // standard way to do this is with reflection, which can also be set to ignore access
1008 // restrictions.
1009
1010 // Access into an anonymous class is possible only through reflection. Therefore, there
1011 // are no special access rules for calling into an anonymous class. The relaxed access
1012 // rule for the host class is applied in the opposite direction: A host class reflectively
1013 // access one of its anonymous classes.
1014
1015 // If you load the same bytecodes twice, you get two different classes. You can reload
1016 // the same bytecodes with or without varying CP patches.
1017
1018 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
1019 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
1020 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
1021
1022 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
1023 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
1024 // It is not possible for a named class, or an older anonymous class, to refer by
1025 // name (via its CP) to a newer anonymous class.
1026
1027 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
1028 // or type descriptors used in the loaded anonymous class.
1029
1030 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
1031 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
1032 // be changed to println(greeting), where greeting is an arbitrary object created before
1033 // the anonymous class is loaded. This is useful in dynamic languages, in which
1034 // various kinds of metaobjects must be introduced as constants into bytecode.
1035 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
1036 // not just a literal string. For such ldc instructions, the verifier uses the
1037 // type Object instead of String, if the loaded constant is not in fact a String.
1038
1039 static instanceKlassHandle
1040 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
1041 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
1042 HeapWord* *temp_alloc,
1043 TRAPS) {
1044
1045 if (UsePerfData) {
1046 ClassLoader::unsafe_defineClassCallCounter()->inc();
1047 }
1048
1049 if (data == NULL) {
1050 THROW_0(vmSymbols::java_lang_NullPointerException());
1051 }
1052
1053 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
1054 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
1055 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal);
1056 if (body == NULL) {
1057 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1058 }
1059
1060 // caller responsible to free it:
1061 (*temp_alloc) = body;
1062
1063 {
1064 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1065 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1066 }
1067
1068 u1* class_bytes = (u1*) body;
1069 int class_bytes_length = (int) length;
1070 if (class_bytes_length < 0) class_bytes_length = 0;
1071 if (class_bytes == NULL
1072 || host_class == NULL
1073 || length != class_bytes_length)
1074 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1075
1076 objArrayHandle cp_patches_h;
1077 if (cp_patches_jh != NULL) {
1078 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1079 if (!p->is_objArray())
1080 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1081 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1082 }
1083
1084 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class)));
1085 const char* host_source = host_klass->external_name();
1086 Handle host_loader(THREAD, host_klass->class_loader());
1087 Handle host_domain(THREAD, host_klass->protection_domain());
1088
1089 GrowableArray<Handle>* cp_patches = NULL;
1090 if (cp_patches_h.not_null()) {
1091 int alen = cp_patches_h->length();
1092 for (int i = alen-1; i >= 0; i--) {
1093 oop p = cp_patches_h->obj_at(i);
1094 if (p != NULL) {
1095 Handle patch(THREAD, p);
1096 if (cp_patches == NULL)
1097 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1098 cp_patches->at_put(i, patch);
1099 }
1100 }
1101 }
1102
1103 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1104
1105 instanceKlassHandle anon_klass;
1106 {
1107 Symbol* no_class_name = NULL;
1108 Klass* anonk = SystemDictionary::parse_stream(no_class_name,
1109 host_loader, host_domain,
1110 &st, host_klass, cp_patches,
1111 CHECK_NULL);
1112 if (anonk == NULL) return NULL;
1113 anon_klass = instanceKlassHandle(THREAD, anonk);
1114 }
1115
1116 return anon_klass;
1117 }
1118
1119 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1120 {
1121 instanceKlassHandle anon_klass;
1122 jobject res_jh = NULL;
1123
1124 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1125 ResourceMark rm(THREAD);
1126
1127 HeapWord* temp_alloc = NULL;
1128
1129 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data,
1130 cp_patches_jh,
1131 &temp_alloc, THREAD);
1132 if (anon_klass() != NULL)
1133 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
1134
1135 // try/finally clause:
1136 if (temp_alloc != NULL) {
1137 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal);
1138 }
1139
1140 // The anonymous class loader data has been artificially been kept alive to
1141 // this point. The mirror and any instances of this class have to keep
1142 // it alive afterwards.
1143 if (anon_klass() != NULL) {
1144 anon_klass->class_loader_data()->set_keep_alive(false);
1145 }
1146
1147 // let caller initialize it as needed...
1148
1149 return (jclass) res_jh;
1150 }
1151 UNSAFE_END
1152
1153
1154
1155 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1156 UnsafeWrapper("Unsafe_MonitorEnter");
1157 {
1158 if (jobj == NULL) {
1159 THROW(vmSymbols::java_lang_NullPointerException());
1160 }
1161 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1162 ObjectSynchronizer::jni_enter(obj, CHECK);
1163 }
1164 UNSAFE_END
1165
1166
1167 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1168 UnsafeWrapper("Unsafe_TryMonitorEnter");
1169 {
1170 if (jobj == NULL) {
1171 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1172 }
1173 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1174 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1175 return (res ? JNI_TRUE : JNI_FALSE);
1176 }
1177 UNSAFE_END
1178
1179
1180 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1181 UnsafeWrapper("Unsafe_MonitorExit");
1182 {
1183 if (jobj == NULL) {
1184 THROW(vmSymbols::java_lang_NullPointerException());
1185 }
1186 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1187 ObjectSynchronizer::jni_exit(obj(), CHECK);
1188 }
1189 UNSAFE_END
1190
1191
1192 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1193 UnsafeWrapper("Unsafe_ThrowException");
1194 {
1195 ThreadToNativeFromVM ttnfv(thread);
1196 env->Throw(thr);
1197 }
1198 UNSAFE_END
1199
1200 // JSR166 ------------------------------------------------------------------
1201
1202 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1203 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1204 oop x = JNIHandles::resolve(x_h);
1205 oop e = JNIHandles::resolve(e_h);
1206 oop p = JNIHandles::resolve(obj);
1207 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1208 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
1209 jboolean success = (res == e);
1210 if (success)
1211 update_barrier_set((void*)addr, x);
1212 return success;
1213 UNSAFE_END
1214
1215 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1216 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1217 oop p = JNIHandles::resolve(obj);
1218 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1219 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1220 UNSAFE_END
1221
1222 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1223 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1224 Handle p (THREAD, JNIHandles::resolve(obj));
1225 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1226 #ifdef SUPPORTS_NATIVE_CX8
1227 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1228 #else
1229 if (VM_Version::supports_cx8())
1230 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1231 else {
1232 jboolean success = false;
1233 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
1234 jlong val = Atomic::load(addr);
1235 if (val == e) { Atomic::store(x, addr); success = true; }
1236 return success;
1237 }
1238 #endif
1239 UNSAFE_END
1240
1241 #if INCLUDE_JFR
1242 static void post_thread_park_event(EventThreadPark* event, const oop obj, jlong timeout_nanos, jlong until_epoch_millis) {
1243 assert(event != NULL, "invariant");
1244 assert(event->should_commit(), "invariant");
1245 event->set_parkedClass((obj != NULL) ? obj->klass() : NULL);
1246 event->set_timeout(timeout_nanos);
1247 event->set_until(until_epoch_millis);
1248 event->set_address((obj != NULL) ? (u8)cast_from_oop<uintptr_t>(obj) : 0);
1249 event->commit();
1250 }
1251 #endif
1252
1253 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1254 UnsafeWrapper("Unsafe_Park");
1255 #if INCLUDE_JFR
1256 EventThreadPark event;
1257 #endif
1258 #ifndef USDT2
1259 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1260 #else /* USDT2 */
1261 HOTSPOT_THREAD_PARK_BEGIN(
1262 (uintptr_t) thread->parker(), (int) isAbsolute, time);
1263 #endif /* USDT2 */
1264 JavaThreadParkedState jtps(thread, time != 0);
1265 thread->parker()->park(isAbsolute != 0, time);
1266 #ifndef USDT2
1267 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1268 #else /* USDT2 */
1269 HOTSPOT_THREAD_PARK_END(
1270 (uintptr_t) thread->parker());
1271 #endif /* USDT2 */
1272 #if INCLUDE_JFR
1273 if (event.should_commit()) {
1274 const oop obj = thread->current_park_blocker();
1275 if (time == 0) {
1276 post_thread_park_event(&event, obj, min_jlong, min_jlong);
1277 } else {
1278 if (isAbsolute != 0) {
1279 post_thread_park_event(&event, obj, min_jlong, time);
1280 } else {
1281 post_thread_park_event(&event, obj, time, min_jlong);
1282 }
1283 }
1284 }
1285 #endif
1286 UNSAFE_END
1287
1288 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1289 UnsafeWrapper("Unsafe_Unpark");
1290 Parker* p = NULL;
1291 if (jthread != NULL) {
1292 oop java_thread = JNIHandles::resolve_non_null(jthread);
1293 if (java_thread != NULL) {
1294 jlong lp = java_lang_Thread::park_event(java_thread);
1295 if (lp != 0) {
1296 // This cast is OK even though the jlong might have been read
1297 // non-atomically on 32bit systems, since there, one word will
1298 // always be zero anyway and the value set is always the same
1299 p = (Parker*)addr_from_java(lp);
1300 } else {
1301 // Grab lock if apparently null or using older version of library
1302 MutexLocker mu(Threads_lock);
1303 java_thread = JNIHandles::resolve_non_null(jthread);
1304 if (java_thread != NULL) {
1305 JavaThread* thr = java_lang_Thread::thread(java_thread);
1306 if (thr != NULL) {
1307 p = thr->parker();
1308 if (p != NULL) { // Bind to Java thread for next time.
1309 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1310 }
1311 }
1312 }
1313 }
1314 }
1315 }
1316 if (p != NULL) {
1317 #ifndef USDT2
1318 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1319 #else /* USDT2 */
1320 HOTSPOT_THREAD_UNPARK(
1321 (uintptr_t) p);
1322 #endif /* USDT2 */
1323 p->unpark();
1324 }
1325 UNSAFE_END
1326
1327 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1328 UnsafeWrapper("Unsafe_Loadavg");
1329 const int max_nelem = 3;
1330 double la[max_nelem];
1331 jint ret;
1332
1333 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1334 assert(a->is_typeArray(), "must be type array");
1335
1336 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1337 ThreadToNativeFromVM ttnfv(thread);
1338 throw_new(env, "ArrayIndexOutOfBoundsException");
1339 return -1;
1340 }
1341
1342 ret = os::loadavg(la, nelem);
1343 if (ret == -1) return -1;
1344
1345 // if successful, ret is the number of samples actually retrieved.
1346 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1347 switch(ret) {
1348 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1349 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1350 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1351 }
1352 return ret;
1353 UNSAFE_END
1354
1355 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1356 UnsafeWrapper("Unsafe_PrefetchRead");
1357 oop p = JNIHandles::resolve(obj);
1358 void* addr = index_oop_from_field_offset_long(p, 0);
1359 Prefetch::read(addr, (intx)offset);
1360 UNSAFE_END
1361
1362 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1363 UnsafeWrapper("Unsafe_PrefetchWrite");
1364 oop p = JNIHandles::resolve(obj);
1365 void* addr = index_oop_from_field_offset_long(p, 0);
1366 Prefetch::write(addr, (intx)offset);
1367 UNSAFE_END
1368
1369
1370 /// JVM_RegisterUnsafeMethods
1371
1372 #define ADR "J"
1373
1374 #define LANG "Ljava/lang/"
1375
1376 #define OBJ LANG "Object;"
1377 #define CLS LANG "Class;"
1378 #define CTR LANG "reflect/Constructor;"
1379 #define FLD LANG "reflect/Field;"
1380 #define MTH LANG "reflect/Method;"
1381 #define THR LANG "Throwable;"
1382
1383 #define DC0_Args LANG "String;[BII"
1384 #define DC_Args DC0_Args LANG "ClassLoader;" "Ljava/security/ProtectionDomain;"
1385
1386 #define CC (char*) /*cast a literal from (const char*)*/
1387 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1388
1389 // define deprecated accessors for compabitility with 1.4.0
1390 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1391 {CC "get" #Boolean, CC "(" OBJ "I)" #Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1392 {CC "put" #Boolean, CC "(" OBJ "I" #Z ")V", FN_PTR(Unsafe_Set##Boolean##140)}
1393
1394 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1395 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1396 {CC "get" #Boolean, CC "(" OBJ "J)" #Z, FN_PTR(Unsafe_Get##Boolean)}, \
1397 {CC "put" #Boolean, CC "(" OBJ "J" #Z ")V", FN_PTR(Unsafe_Set##Boolean)}
1398
1399 // Note: In 1.5.0, there are volatile versions too
1400 #define DECLARE_GETSETOOP(Boolean, Z) \
1401 {CC "get" #Boolean, CC "(" OBJ "J)" #Z, FN_PTR(Unsafe_Get##Boolean)}, \
1402 {CC "put" #Boolean, CC "(" OBJ "J" #Z ")V", FN_PTR(Unsafe_Set##Boolean)}, \
1403 {CC "get" #Boolean "Volatile", CC "(" OBJ "J)" #Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1404 {CC "put" #Boolean "Volatile", CC "(" OBJ "J" #Z ")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1405
1406
1407 #define DECLARE_GETSETNATIVE(Byte, B) \
1408 {CC "get" #Byte, CC "(" ADR ")" #B, FN_PTR(Unsafe_GetNative##Byte)}, \
1409 {CC "put" #Byte, CC "(" ADR#B ")V", FN_PTR(Unsafe_SetNative##Byte)}
1410
1411
1412
1413 // These are the methods for 1.4.0
1414 static JNINativeMethod methods_140[] = {
1415 {CC "getObject", CC "(" OBJ "I)" OBJ "", FN_PTR(Unsafe_GetObject140)},
1416 {CC "putObject", CC "(" OBJ "I" OBJ ")V", FN_PTR(Unsafe_SetObject140)},
1417
1418 DECLARE_GETSETOOP_140(Boolean, Z),
1419 DECLARE_GETSETOOP_140(Byte, B),
1420 DECLARE_GETSETOOP_140(Short, S),
1421 DECLARE_GETSETOOP_140(Char, C),
1422 DECLARE_GETSETOOP_140(Int, I),
1423 DECLARE_GETSETOOP_140(Long, J),
1424 DECLARE_GETSETOOP_140(Float, F),
1425 DECLARE_GETSETOOP_140(Double, D),
1426
1427 DECLARE_GETSETNATIVE(Byte, B),
1428 DECLARE_GETSETNATIVE(Short, S),
1429 DECLARE_GETSETNATIVE(Char, C),
1430 DECLARE_GETSETNATIVE(Int, I),
1431 DECLARE_GETSETNATIVE(Long, J),
1432 DECLARE_GETSETNATIVE(Float, F),
1433 DECLARE_GETSETNATIVE(Double, D),
1434
1435 {CC "getAddress", CC "(" ADR ")" ADR, FN_PTR(Unsafe_GetNativeAddress)},
1436 {CC "putAddress", CC "(" ADR "" ADR ")V", FN_PTR(Unsafe_SetNativeAddress)},
1437
1438 {CC "allocateMemory", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory)},
1439 {CC "reallocateMemory", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory)},
1440 {CC "freeMemory", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory)},
1441
1442 {CC "fieldOffset", CC "(" FLD ")I", FN_PTR(Unsafe_FieldOffset)},
1443 {CC "staticFieldBase", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)},
1444 {CC "ensureClassInitialized",CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1445 {CC "arrayBaseOffset", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1446 {CC "arrayIndexScale", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale)},
1447 {CC "addressSize", CC "()I", FN_PTR(Unsafe_AddressSize)},
1448 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1449
1450 {CC "defineClass", CC "(" DC0_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)},
1451 {CC "defineClass", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass)},
1452 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1453 {CC "monitorEnter", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorEnter)},
1454 {CC "monitorExit", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorExit)},
1455 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)}
1456 };
1457
1458 // These are the methods prior to the JSR 166 changes in 1.5.0
1459 static JNINativeMethod methods_141[] = {
1460 {CC "getObject", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObject)},
1461 {CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObject)},
1462
1463 DECLARE_GETSETOOP_141(Boolean, Z),
1464 DECLARE_GETSETOOP_141(Byte, B),
1465 DECLARE_GETSETOOP_141(Short, S),
1466 DECLARE_GETSETOOP_141(Char, C),
1467 DECLARE_GETSETOOP_141(Int, I),
1468 DECLARE_GETSETOOP_141(Long, J),
1469 DECLARE_GETSETOOP_141(Float, F),
1470 DECLARE_GETSETOOP_141(Double, D),
1471
1472 DECLARE_GETSETNATIVE(Byte, B),
1473 DECLARE_GETSETNATIVE(Short, S),
1474 DECLARE_GETSETNATIVE(Char, C),
1475 DECLARE_GETSETNATIVE(Int, I),
1476 DECLARE_GETSETNATIVE(Long, J),
1477 DECLARE_GETSETNATIVE(Float, F),
1478 DECLARE_GETSETNATIVE(Double, D),
1479
1480 {CC "getAddress", CC "(" ADR ")" ADR, FN_PTR(Unsafe_GetNativeAddress)},
1481 {CC "putAddress", CC "(" ADR "" ADR ")V", FN_PTR(Unsafe_SetNativeAddress)},
1482
1483 {CC "allocateMemory", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory)},
1484 {CC "reallocateMemory", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory)},
1485 {CC "freeMemory", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory)},
1486
1487 {CC "objectFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1488 {CC "staticFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset)},
1489 {CC "staticFieldBase", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1490 {CC "ensureClassInitialized",CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1491 {CC "arrayBaseOffset", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1492 {CC "arrayIndexScale", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale)},
1493 {CC "addressSize", CC "()I", FN_PTR(Unsafe_AddressSize)},
1494 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1495
1496 {CC "defineClass", CC "(" DC0_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)},
1497 {CC "defineClass", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass)},
1498 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1499 {CC "monitorEnter", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorEnter)},
1500 {CC "monitorExit", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorExit)},
1501 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)}
1502
1503 };
1504
1505 // These are the methods prior to the JSR 166 changes in 1.6.0
1506 static JNINativeMethod methods_15[] = {
1507 {CC "getObject", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObject)},
1508 {CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObject)},
1509 {CC "getObjectVolatile",CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObjectVolatile)},
1510 {CC "putObjectVolatile",CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1511
1512
1513 DECLARE_GETSETOOP(Boolean, Z),
1514 DECLARE_GETSETOOP(Byte, B),
1515 DECLARE_GETSETOOP(Short, S),
1516 DECLARE_GETSETOOP(Char, C),
1517 DECLARE_GETSETOOP(Int, I),
1518 DECLARE_GETSETOOP(Long, J),
1519 DECLARE_GETSETOOP(Float, F),
1520 DECLARE_GETSETOOP(Double, D),
1521
1522 DECLARE_GETSETNATIVE(Byte, B),
1523 DECLARE_GETSETNATIVE(Short, S),
1524 DECLARE_GETSETNATIVE(Char, C),
1525 DECLARE_GETSETNATIVE(Int, I),
1526 DECLARE_GETSETNATIVE(Long, J),
1527 DECLARE_GETSETNATIVE(Float, F),
1528 DECLARE_GETSETNATIVE(Double, D),
1529
1530 {CC "getAddress", CC "(" ADR ")" ADR, FN_PTR(Unsafe_GetNativeAddress)},
1531 {CC "putAddress", CC "(" ADR "" ADR ")V", FN_PTR(Unsafe_SetNativeAddress)},
1532
1533 {CC "allocateMemory", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory)},
1534 {CC "reallocateMemory", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory)},
1535 {CC "freeMemory", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory)},
1536
1537 {CC "objectFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1538 {CC "staticFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset)},
1539 {CC "staticFieldBase", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1540 {CC "ensureClassInitialized",CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1541 {CC "arrayBaseOffset", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1542 {CC "arrayIndexScale", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale)},
1543 {CC "addressSize", CC "()I", FN_PTR(Unsafe_AddressSize)},
1544 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1545
1546 {CC "defineClass", CC "(" DC0_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)},
1547 {CC "defineClass", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass)},
1548 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1549 {CC "monitorEnter", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorEnter)},
1550 {CC "monitorExit", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorExit)},
1551 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)},
1552 {CC "compareAndSwapObject", CC "(" OBJ "J" OBJ "" OBJ ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1553 {CC "compareAndSwapInt", CC "(" OBJ "J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1554 {CC "compareAndSwapLong", CC "(" OBJ "J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1555 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)},
1556 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)}
1557
1558 };
1559
1560 // These are the methods for 1.6.0 and 1.7.0
1561 static JNINativeMethod methods_16[] = {
1562 {CC "getObject", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObject)},
1563 {CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObject)},
1564 {CC "getObjectVolatile",CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObjectVolatile)},
1565 {CC "putObjectVolatile",CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1566
1567 DECLARE_GETSETOOP(Boolean, Z),
1568 DECLARE_GETSETOOP(Byte, B),
1569 DECLARE_GETSETOOP(Short, S),
1570 DECLARE_GETSETOOP(Char, C),
1571 DECLARE_GETSETOOP(Int, I),
1572 DECLARE_GETSETOOP(Long, J),
1573 DECLARE_GETSETOOP(Float, F),
1574 DECLARE_GETSETOOP(Double, D),
1575
1576 DECLARE_GETSETNATIVE(Byte, B),
1577 DECLARE_GETSETNATIVE(Short, S),
1578 DECLARE_GETSETNATIVE(Char, C),
1579 DECLARE_GETSETNATIVE(Int, I),
1580 DECLARE_GETSETNATIVE(Long, J),
1581 DECLARE_GETSETNATIVE(Float, F),
1582 DECLARE_GETSETNATIVE(Double, D),
1583
1584 {CC "getAddress", CC "(" ADR ")" ADR, FN_PTR(Unsafe_GetNativeAddress)},
1585 {CC "putAddress", CC "(" ADR "" ADR ")V", FN_PTR(Unsafe_SetNativeAddress)},
1586
1587 {CC "allocateMemory", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory)},
1588 {CC "reallocateMemory", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory)},
1589 {CC "freeMemory", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory)},
1590
1591 {CC "objectFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1592 {CC "staticFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset)},
1593 {CC "staticFieldBase", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1594 {CC "ensureClassInitialized",CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1595 {CC "arrayBaseOffset", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1596 {CC "arrayIndexScale", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale)},
1597 {CC "addressSize", CC "()I", FN_PTR(Unsafe_AddressSize)},
1598 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1599
1600 {CC "defineClass", CC "(" DC0_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)},
1601 {CC "defineClass", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass)},
1602 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1603 {CC "monitorEnter", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorEnter)},
1604 {CC "monitorExit", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorExit)},
1605 {CC "tryMonitorEnter", CC "(" OBJ ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1606 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)},
1607 {CC "compareAndSwapObject", CC "(" OBJ "J" OBJ "" OBJ ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1608 {CC "compareAndSwapInt", CC "(" OBJ "J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1609 {CC "compareAndSwapLong", CC "(" OBJ "J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1610 {CC "putOrderedObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetOrderedObject)},
1611 {CC "putOrderedInt", CC "(" OBJ "JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1612 {CC "putOrderedLong", CC "(" OBJ "JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1613 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)},
1614 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)}
1615 };
1616
1617 // These are the methods for 1.8.0
1618 static JNINativeMethod methods_18[] = {
1619 {CC "getObject", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObject)},
1620 {CC "putObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObject)},
1621 {CC "getObjectVolatile",CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetObjectVolatile)},
1622 {CC "putObjectVolatile",CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1623
1624 DECLARE_GETSETOOP(Boolean, Z),
1625 DECLARE_GETSETOOP(Byte, B),
1626 DECLARE_GETSETOOP(Short, S),
1627 DECLARE_GETSETOOP(Char, C),
1628 DECLARE_GETSETOOP(Int, I),
1629 DECLARE_GETSETOOP(Long, J),
1630 DECLARE_GETSETOOP(Float, F),
1631 DECLARE_GETSETOOP(Double, D),
1632
1633 DECLARE_GETSETNATIVE(Byte, B),
1634 DECLARE_GETSETNATIVE(Short, S),
1635 DECLARE_GETSETNATIVE(Char, C),
1636 DECLARE_GETSETNATIVE(Int, I),
1637 DECLARE_GETSETNATIVE(Long, J),
1638 DECLARE_GETSETNATIVE(Float, F),
1639 DECLARE_GETSETNATIVE(Double, D),
1640
1641 {CC "getAddress", CC "(" ADR ")" ADR, FN_PTR(Unsafe_GetNativeAddress)},
1642 {CC "putAddress", CC "(" ADR "" ADR ")V", FN_PTR(Unsafe_SetNativeAddress)},
1643
1644 {CC "allocateMemory", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory)},
1645 {CC "reallocateMemory", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory)},
1646 {CC "freeMemory", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory)},
1647
1648 {CC "objectFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1649 {CC "staticFieldOffset", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset)},
1650 {CC "staticFieldBase", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1651 {CC "ensureClassInitialized",CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1652 {CC "arrayBaseOffset", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1653 {CC "arrayIndexScale", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale)},
1654 {CC "addressSize", CC "()I", FN_PTR(Unsafe_AddressSize)},
1655 {CC "pageSize", CC "()I", FN_PTR(Unsafe_PageSize)},
1656
1657 {CC "defineClass", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass)},
1658 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)},
1659 {CC "monitorEnter", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorEnter)},
1660 {CC "monitorExit", CC "(" OBJ ")V", FN_PTR(Unsafe_MonitorExit)},
1661 {CC "tryMonitorEnter", CC "(" OBJ ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1662 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)},
1663 {CC "compareAndSwapObject", CC "(" OBJ "J" OBJ "" OBJ ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1664 {CC "compareAndSwapInt", CC "(" OBJ "J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1665 {CC "compareAndSwapLong", CC "(" OBJ "J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1666 {CC "putOrderedObject", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_SetOrderedObject)},
1667 {CC "putOrderedInt", CC "(" OBJ "JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1668 {CC "putOrderedLong", CC "(" OBJ "JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1669 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)},
1670 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)}
1671 };
1672
1673 JNINativeMethod loadavg_method[] = {
1674 {CC "getLoadAverage", CC "([DI)I", FN_PTR(Unsafe_Loadavg)}
1675 };
1676
1677 JNINativeMethod prefetch_methods[] = {
1678 {CC "prefetchRead", CC "(" OBJ "J)V", FN_PTR(Unsafe_PrefetchRead)},
1679 {CC "prefetchWrite", CC "(" OBJ "J)V", FN_PTR(Unsafe_PrefetchWrite)},
1680 {CC "prefetchReadStatic", CC "(" OBJ "J)V", FN_PTR(Unsafe_PrefetchRead)},
1681 {CC "prefetchWriteStatic",CC "(" OBJ "J)V", FN_PTR(Unsafe_PrefetchWrite)}
1682 };
1683
1684 JNINativeMethod memcopy_methods_17[] = {
1685 {CC "copyMemory", CC "(" OBJ "J" OBJ "JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1686 {CC "setMemory", CC "(" OBJ "JJB)V", FN_PTR(Unsafe_SetMemory2)}
1687 };
1688
1689 JNINativeMethod memcopy_methods_15[] = {
1690 {CC "setMemory", CC "(" ADR "JB)V", FN_PTR(Unsafe_SetMemory)},
1691 {CC "copyMemory", CC "(" ADR ADR "J)V", FN_PTR(Unsafe_CopyMemory)}
1692 };
1693
1694 JNINativeMethod anonk_methods[] = {
1695 {CC "defineAnonymousClass", CC "(" DAC_Args ")" CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1696 };
1697
1698 JNINativeMethod lform_methods[] = {
1699 {CC "shouldBeInitialized",CC "(" CLS ")Z", FN_PTR(Unsafe_ShouldBeInitialized)},
1700 };
1701
1702 JNINativeMethod fence_methods[] = {
1703 {CC "loadFence", CC "()V", FN_PTR(Unsafe_LoadFence)},
1704 {CC "storeFence", CC "()V", FN_PTR(Unsafe_StoreFence)},
1705 {CC "fullFence", CC "()V", FN_PTR(Unsafe_FullFence)},
1706 };
1707
1708 #undef CC
1709 #undef FN_PTR
1710
1711 #undef ADR
1712 #undef LANG
1713 #undef OBJ
1714 #undef CLS
1715 #undef CTR
1716 #undef FLD
1717 #undef MTH
1718 #undef THR
1719 #undef DC0_Args
1720 #undef DC_Args
1721
1722 #undef DECLARE_GETSETOOP
1723 #undef DECLARE_GETSETNATIVE
1724
1725
1726 /**
1727 * Helper method to register native methods.
1728 */
1729 static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1730 int status = env->RegisterNatives(clazz, methods, nMethods);
1731 if (status < 0 || env->ExceptionOccurred()) {
1732 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1733 tty->print_cr("Unsafe: failed registering %s", message);
1734 }
1735 env->ExceptionClear();
1736 return false;
1737 } else {
1738 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1739 tty->print_cr("Unsafe: successfully registered %s", message);
1740 }
1741 return true;
1742 }
1743 }
1744
1745
1746 // This one function is exported, used by NativeLookup.
1747 // The Unsafe_xxx functions above are called only from the interpreter.
1748 // The optimizer looks at names and signatures to recognize
1749 // individual functions.
1750
1751 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1752 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1753 {
1754 ThreadToNativeFromVM ttnfv(thread);
1755
1756 // Unsafe methods
1757 {
1758 bool success = false;
1759 // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6
1760 if (!success) {
1761 success = register_natives("1.6 methods", env, unsafecls, methods_16, sizeof(methods_16)/sizeof(JNINativeMethod));
1762 }
1763 if (!success) {
1764 success = register_natives("1.8 methods", env, unsafecls, methods_18, sizeof(methods_18)/sizeof(JNINativeMethod));
1765 }
1766 if (!success) {
1767 success = register_natives("1.5 methods", env, unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1768 }
1769 if (!success) {
1770 success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1771 }
1772 if (!success) {
1773 success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1774 }
1775 guarantee(success, "register unsafe natives");
1776 }
1777
1778 // Unsafe.getLoadAverage
1779 register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1780
1781 // Prefetch methods
1782 register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1783
1784 // Memory copy methods
1785 {
1786 bool success = false;
1787 if (!success) {
1788 success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod));
1789 }
1790 if (!success) {
1791 success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1792 }
1793 }
1794
1795 // Unsafe.defineAnonymousClass
1796 if (EnableInvokeDynamic) {
1797 register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1798 }
1799
1800 // Unsafe.shouldBeInitialized
1801 if (EnableInvokeDynamic) {
1802 register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod));
1803 }
1804
1805 // Fence methods
1806 register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod));
1807 }
1808 JVM_END