1 /*
2 * Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/vmSymbols.hpp"
27 #include "utilities/macros.hpp"
28 #if INCLUDE_ALL_GCS
29 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
30 #endif // INCLUDE_ALL_GCS
31 #include "memory/allocation.inline.hpp"
32 #include "prims/jni.h"
33 #include "prims/jvm.h"
34 #include "runtime/globals.hpp"
35 #include "runtime/interfaceSupport.hpp"
36 #include "runtime/prefetch.inline.hpp"
37 #include "runtime/orderAccess.inline.hpp"
38 #include "runtime/reflection.hpp"
39 #include "runtime/synchronizer.hpp"
40 #include "services/threadService.hpp"
41 #include "trace/tracing.hpp"
42 #include "utilities/copy.hpp"
43 #include "utilities/dtrace.hpp"
44
45 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
46
47 /*
48 * Implementation of class sun.misc.Unsafe
49 */
50
51 #ifndef USDT2
52 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long);
53 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t);
54 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t);
55 #endif /* !USDT2 */
56
57 #define MAX_OBJECT_SIZE \
58 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
59 + ((julong)max_jint * sizeof(double)) )
60
61
62 #define UNSAFE_ENTRY(result_type, header) \
63 JVM_ENTRY(result_type, header)
64
65 // Can't use UNSAFE_LEAF because it has the signature of a straight
66 // call into the runtime (just like JVM_LEAF, funny that) but it's
67 // called like a Java Native and thus the wrapper built for it passes
68 // arguments like a JNI call. It expects those arguments to be popped
69 // from the stack on Intel like all good JNI args are, and adjusts the
70 // stack according. Since the JVM_LEAF call expects no extra
71 // arguments the stack isn't popped in the C code, is pushed by the
72 // wrapper and we get sick.
73 //#define UNSAFE_LEAF(result_type, header) \
74 // JVM_LEAF(result_type, header)
75
76 #define UNSAFE_END JVM_END
77
78 #define UnsafeWrapper(arg) /*nothing, for the present*/
79
80
81 inline void* addr_from_java(jlong addr) {
82 // This assert fails in a variety of ways on 32-bit systems.
83 // It is impossible to predict whether native code that converts
84 // pointers to longs will sign-extend or zero-extend the addresses.
85 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
86 return (void*)(uintptr_t)addr;
87 }
88
89 inline jlong addr_to_java(void* p) {
90 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
91 return (uintptr_t)p;
92 }
93
94
95 // Note: The VM's obj_field and related accessors use byte-scaled
96 // ("unscaled") offsets, just as the unsafe methods do.
97
98 // However, the method Unsafe.fieldOffset explicitly declines to
99 // guarantee this. The field offset values manipulated by the Java user
100 // through the Unsafe API are opaque cookies that just happen to be byte
101 // offsets. We represent this state of affairs by passing the cookies
102 // through conversion functions when going between the VM and the Unsafe API.
103 // The conversion functions just happen to be no-ops at present.
104
105 inline jlong field_offset_to_byte_offset(jlong field_offset) {
106 return field_offset;
107 }
108
109 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
110 return byte_offset;
111 }
112
113 inline jint invocation_key_from_method_slot(jint slot) {
114 return slot;
115 }
116
117 inline jint invocation_key_to_method_slot(jint key) {
118 return key;
119 }
120
121 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
122 jlong byte_offset = field_offset_to_byte_offset(field_offset);
123 #ifdef ASSERT
124 if (p != NULL) {
125 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
126 if (byte_offset == (jint)byte_offset) {
127 void* ptr_plus_disp = (address)p + byte_offset;
128 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
129 "raw [ptr+disp] must be consistent with oop::field_base");
130 }
131 jlong p_size = HeapWordSize * (jlong)(p->size());
132 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size));
133 }
134 #endif
135 if (sizeof(char*) == sizeof(jint)) // (this constant folds!)
136 return (address)p + (jint) byte_offset;
137 else
138 return (address)p + byte_offset;
139 }
140
141 // Externally callable versions:
142 // (Use these in compiler intrinsics which emulate unsafe primitives.)
143 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
144 return field_offset;
145 }
146 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
147 return byte_offset;
148 }
149 jint Unsafe_invocation_key_from_method_slot(jint slot) {
150 return invocation_key_from_method_slot(slot);
151 }
152 jint Unsafe_invocation_key_to_method_slot(jint key) {
153 return invocation_key_to_method_slot(key);
154 }
155
156
157 ///// Data in the Java heap.
158
159 #define truncate_jboolean(x) ((x) & 1)
160 #define truncate_jbyte(x) (x)
161 #define truncate_jshort(x) (x)
162 #define truncate_jchar(x) (x)
163 #define truncate_jint(x) (x)
164 #define truncate_jlong(x) (x)
165 #define truncate_jfloat(x) (x)
166 #define truncate_jdouble(x) (x)
167
168 #define GET_FIELD(obj, offset, type_name, v) \
169 oop p = JNIHandles::resolve(obj); \
170 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
171
172 #define SET_FIELD(obj, offset, type_name, x) \
173 oop p = JNIHandles::resolve(obj); \
174 *(type_name*)index_oop_from_field_offset_long(p, offset) = truncate_##type_name(x)
175
176 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
177 oop p = JNIHandles::resolve(obj); \
178 if (support_IRIW_for_not_multiple_copy_atomic_cpu) { \
179 OrderAccess::fence(); \
180 } \
181 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
182
183 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
184 oop p = JNIHandles::resolve(obj); \
185 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), truncate_##type_name(x));
186
187 // Macros for oops that check UseCompressedOops
188
189 #define GET_OOP_FIELD(obj, offset, v) \
190 oop p = JNIHandles::resolve(obj); \
191 oop v; \
192 if (UseCompressedOops) { \
193 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
194 v = oopDesc::decode_heap_oop(n); \
195 } else { \
196 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
197 }
198
199
200 // Get/SetObject must be special-cased, since it works with handles.
201
202 // The xxx140 variants for backward compatibility do not allow a full-width offset.
203 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
204 UnsafeWrapper("Unsafe_GetObject");
205 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
206 GET_OOP_FIELD(obj, offset, v)
207 jobject ret = JNIHandles::make_local(env, v);
208 #if INCLUDE_ALL_GCS
209 // We could be accessing the referent field in a reference
210 // object. If G1 is enabled then we need to register a non-null
211 // referent with the SATB barrier.
212 if (UseG1GC) {
213 bool needs_barrier = false;
214
215 if (ret != NULL) {
216 if (offset == java_lang_ref_Reference::referent_offset) {
217 oop o = JNIHandles::resolve_non_null(obj);
218 Klass* k = o->klass();
219 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
220 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
221 needs_barrier = true;
222 }
223 }
224 }
225
226 if (needs_barrier) {
227 oop referent = JNIHandles::resolve(ret);
228 G1SATBCardTableModRefBS::enqueue(referent);
229 }
230 }
231 #endif // INCLUDE_ALL_GCS
232 return ret;
233 UNSAFE_END
234
235 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
236 UnsafeWrapper("Unsafe_SetObject");
237 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
238 oop x = JNIHandles::resolve(x_h);
239 //SET_FIELD(obj, offset, oop, x);
240 oop p = JNIHandles::resolve(obj);
241 if (UseCompressedOops) {
242 if (x != NULL) {
243 // If there is a heap base pointer, we are obliged to emit a store barrier.
244 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
245 } else {
246 narrowOop n = oopDesc::encode_heap_oop_not_null(x);
247 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
248 }
249 } else {
250 if (x != NULL) {
251 // If there is a heap base pointer, we are obliged to emit a store barrier.
252 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
253 } else {
254 *(oop*)index_oop_from_field_offset_long(p, offset) = x;
255 }
256 }
257 UNSAFE_END
258
259 // The normal variants allow a null base pointer with an arbitrary address.
260 // But if the base pointer is non-null, the offset should make some sense.
261 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
262 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
263 UnsafeWrapper("Unsafe_GetObject");
264 GET_OOP_FIELD(obj, offset, v)
265 jobject ret = JNIHandles::make_local(env, v);
266 #if INCLUDE_ALL_GCS
267 // We could be accessing the referent field in a reference
268 // object. If G1 is enabled then we need to register non-null
269 // referent with the SATB barrier.
270 if (UseG1GC) {
271 bool needs_barrier = false;
272
273 if (ret != NULL) {
274 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) {
275 oop o = JNIHandles::resolve(obj);
276 Klass* k = o->klass();
277 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
278 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
279 needs_barrier = true;
280 }
281 }
282 }
283
284 if (needs_barrier) {
285 oop referent = JNIHandles::resolve(ret);
286 G1SATBCardTableModRefBS::enqueue(referent);
287 }
288 }
289 #endif // INCLUDE_ALL_GCS
290 return ret;
291 UNSAFE_END
292
293 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
294 UnsafeWrapper("Unsafe_SetObject");
295 oop x = JNIHandles::resolve(x_h);
296 oop p = JNIHandles::resolve(obj);
297 if (UseCompressedOops) {
298 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
299 } else {
300 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
301 }
302 UNSAFE_END
303
304 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
305 UnsafeWrapper("Unsafe_GetObjectVolatile");
306 oop p = JNIHandles::resolve(obj);
307 void* addr = index_oop_from_field_offset_long(p, offset);
308 volatile oop v;
309 if (UseCompressedOops) {
310 volatile narrowOop n = *(volatile narrowOop*) addr;
311 (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n));
312 } else {
313 (void)const_cast<oop&>(v = *(volatile oop*) addr);
314 }
315 OrderAccess::acquire();
316 return JNIHandles::make_local(env, v);
317 UNSAFE_END
318
319 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
320 UnsafeWrapper("Unsafe_SetObjectVolatile");
321 oop x = JNIHandles::resolve(x_h);
322 oop p = JNIHandles::resolve(obj);
323 void* addr = index_oop_from_field_offset_long(p, offset);
324 OrderAccess::release();
325 if (UseCompressedOops) {
326 oop_store((narrowOop*)addr, x);
327 } else {
328 oop_store((oop*)addr, x);
329 }
330 OrderAccess::fence();
331 UNSAFE_END
332
333 #ifndef SUPPORTS_NATIVE_CX8
334
335 // VM_Version::supports_cx8() is a surrogate for 'supports atomic long memory ops'.
336 //
337 // On platforms which do not support atomic compare-and-swap of jlong (8 byte)
338 // values we have to use a lock-based scheme to enforce atomicity. This has to be
339 // applied to all Unsafe operations that set the value of a jlong field. Even so
340 // the compareAndSwapLong operation will not be atomic with respect to direct stores
341 // to the field from Java code. It is important therefore that any Java code that
342 // utilizes these Unsafe jlong operations does not perform direct stores. To permit
343 // direct loads of the field from Java code we must also use Atomic::store within the
344 // locked regions. And for good measure, in case there are direct stores, we also
345 // employ Atomic::load within those regions. Note that the field in question must be
346 // volatile and so must have atomic load/store accesses applied at the Java level.
347 //
348 // The locking scheme could utilize a range of strategies for controlling the locking
349 // granularity: from a lock per-field through to a single global lock. The latter is
350 // the simplest and is used for the current implementation. Note that the Java object
351 // that contains the field, can not, in general, be used for locking. To do so can lead
352 // to deadlocks as we may introduce locking into what appears to the Java code to be a
353 // lock-free path.
354 //
355 // As all the locked-regions are very short and themselves non-blocking we can treat
356 // them as leaf routines and elide safepoint checks (ie we don't perform any thread
357 // state transitions even when blocking for the lock). Note that if we do choose to
358 // add safepoint checks and thread state transitions, we must ensure that we calculate
359 // the address of the field _after_ we have acquired the lock, else the object may have
360 // been moved by the GC
361
362 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
363 UnsafeWrapper("Unsafe_GetLongVolatile");
364 {
365 if (VM_Version::supports_cx8()) {
366 GET_FIELD_VOLATILE(obj, offset, jlong, v);
367 return v;
368 }
369 else {
370 Handle p (THREAD, JNIHandles::resolve(obj));
371 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
372 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
373 jlong value = Atomic::load(addr);
374 return value;
375 }
376 }
377 UNSAFE_END
378
379 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
380 UnsafeWrapper("Unsafe_SetLongVolatile");
381 {
382 if (VM_Version::supports_cx8()) {
383 SET_FIELD_VOLATILE(obj, offset, jlong, x);
384 }
385 else {
386 Handle p (THREAD, JNIHandles::resolve(obj));
387 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
388 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
389 Atomic::store(x, addr);
390 }
391 }
392 UNSAFE_END
393
394 #endif // not SUPPORTS_NATIVE_CX8
395
396 #define DEFINE_GETSETOOP(jboolean, Boolean) \
397 \
398 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
399 UnsafeWrapper("Unsafe_Get"#Boolean); \
400 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
401 GET_FIELD(obj, offset, jboolean, v); \
402 return v; \
403 UNSAFE_END \
404 \
405 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
406 UnsafeWrapper("Unsafe_Set"#Boolean); \
407 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
408 SET_FIELD(obj, offset, jboolean, x); \
409 UNSAFE_END \
410 \
411 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
412 UnsafeWrapper("Unsafe_Get"#Boolean); \
413 GET_FIELD(obj, offset, jboolean, v); \
414 return v; \
415 UNSAFE_END \
416 \
417 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
418 UnsafeWrapper("Unsafe_Set"#Boolean); \
419 SET_FIELD(obj, offset, jboolean, x); \
420 UNSAFE_END \
421 \
422 // END DEFINE_GETSETOOP.
423
424 DEFINE_GETSETOOP(jboolean, Boolean)
425 DEFINE_GETSETOOP(jbyte, Byte)
426 DEFINE_GETSETOOP(jshort, Short);
427 DEFINE_GETSETOOP(jchar, Char);
428 DEFINE_GETSETOOP(jint, Int);
429 DEFINE_GETSETOOP(jlong, Long);
430 DEFINE_GETSETOOP(jfloat, Float);
431 DEFINE_GETSETOOP(jdouble, Double);
432
433 #undef DEFINE_GETSETOOP
434
435 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
436 \
437 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
438 UnsafeWrapper("Unsafe_Get"#Boolean); \
439 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
440 return v; \
441 UNSAFE_END \
442 \
443 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
444 UnsafeWrapper("Unsafe_Set"#Boolean); \
445 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
446 UNSAFE_END \
447 \
448 // END DEFINE_GETSETOOP_VOLATILE.
449
450 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
451 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
452 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
453 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
454 DEFINE_GETSETOOP_VOLATILE(jint, Int);
455 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
456 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
457
458 #ifdef SUPPORTS_NATIVE_CX8
459 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
460 #endif
461
462 #undef DEFINE_GETSETOOP_VOLATILE
463
464 // The non-intrinsified versions of setOrdered just use setVolatile
465
466 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
467 UnsafeWrapper("Unsafe_SetOrderedInt");
468 SET_FIELD_VOLATILE(obj, offset, jint, x);
469 UNSAFE_END
470
471 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
472 UnsafeWrapper("Unsafe_SetOrderedObject");
473 oop x = JNIHandles::resolve(x_h);
474 oop p = JNIHandles::resolve(obj);
475 void* addr = index_oop_from_field_offset_long(p, offset);
476 OrderAccess::release();
477 if (UseCompressedOops) {
478 oop_store((narrowOop*)addr, x);
479 } else {
480 oop_store((oop*)addr, x);
481 }
482 OrderAccess::fence();
483 UNSAFE_END
484
485 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
486 UnsafeWrapper("Unsafe_SetOrderedLong");
487 #ifdef SUPPORTS_NATIVE_CX8
488 SET_FIELD_VOLATILE(obj, offset, jlong, x);
489 #else
490 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
491 {
492 if (VM_Version::supports_cx8()) {
493 SET_FIELD_VOLATILE(obj, offset, jlong, x);
494 }
495 else {
496 Handle p (THREAD, JNIHandles::resolve(obj));
497 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
498 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
499 Atomic::store(x, addr);
500 }
501 }
502 #endif
503 UNSAFE_END
504
505 UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe))
506 UnsafeWrapper("Unsafe_LoadFence");
507 OrderAccess::acquire();
508 UNSAFE_END
509
510 UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe))
511 UnsafeWrapper("Unsafe_StoreFence");
512 OrderAccess::release();
513 UNSAFE_END
514
515 UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe))
516 UnsafeWrapper("Unsafe_FullFence");
517 OrderAccess::fence();
518 UNSAFE_END
519
520 ////// Data in the C heap.
521
522 // Note: These do not throw NullPointerException for bad pointers.
523 // They just crash. Only a oop base pointer can generate a NullPointerException.
524 //
525 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
526 \
527 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
528 UnsafeWrapper("Unsafe_GetNative"#Type); \
529 void* p = addr_from_java(addr); \
530 JavaThread* t = JavaThread::current(); \
531 t->set_doing_unsafe_access(true); \
532 java_type x = *(volatile native_type*)p; \
533 t->set_doing_unsafe_access(false); \
534 return x; \
535 UNSAFE_END \
536 \
537 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
538 UnsafeWrapper("Unsafe_SetNative"#Type); \
539 JavaThread* t = JavaThread::current(); \
540 t->set_doing_unsafe_access(true); \
541 void* p = addr_from_java(addr); \
542 *(volatile native_type*)p = x; \
543 t->set_doing_unsafe_access(false); \
544 UNSAFE_END \
545 \
546 // END DEFINE_GETSETNATIVE.
547
548 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
549 DEFINE_GETSETNATIVE(jshort, Short, signed short);
550 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
551 DEFINE_GETSETNATIVE(jint, Int, jint);
552 // no long -- handled specially
553 DEFINE_GETSETNATIVE(jfloat, Float, float);
554 DEFINE_GETSETNATIVE(jdouble, Double, double);
555
556 #undef DEFINE_GETSETNATIVE
557
558 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
559 UnsafeWrapper("Unsafe_GetNativeLong");
560 JavaThread* t = JavaThread::current();
561 // We do it this way to avoid problems with access to heap using 64
562 // bit loads, as jlong in heap could be not 64-bit aligned, and on
563 // some CPUs (SPARC) it leads to SIGBUS.
564 t->set_doing_unsafe_access(true);
565 void* p = addr_from_java(addr);
566 jlong x;
567 if (((intptr_t)p & 7) == 0) {
568 // jlong is aligned, do a volatile access
569 x = *(volatile jlong*)p;
570 } else {
571 jlong_accessor acc;
572 acc.words[0] = ((volatile jint*)p)[0];
573 acc.words[1] = ((volatile jint*)p)[1];
574 x = acc.long_value;
575 }
576 t->set_doing_unsafe_access(false);
577 return x;
578 UNSAFE_END
579
580 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
581 UnsafeWrapper("Unsafe_SetNativeLong");
582 JavaThread* t = JavaThread::current();
583 // see comment for Unsafe_GetNativeLong
584 t->set_doing_unsafe_access(true);
585 void* p = addr_from_java(addr);
586 if (((intptr_t)p & 7) == 0) {
587 // jlong is aligned, do a volatile access
588 *(volatile jlong*)p = x;
589 } else {
590 jlong_accessor acc;
591 acc.long_value = x;
592 ((volatile jint*)p)[0] = acc.words[0];
593 ((volatile jint*)p)[1] = acc.words[1];
594 }
595 t->set_doing_unsafe_access(false);
596 UNSAFE_END
597
598
599 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
600 UnsafeWrapper("Unsafe_GetNativeAddress");
601 void* p = addr_from_java(addr);
602 return addr_to_java(*(void**)p);
603 UNSAFE_END
604
605 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
606 UnsafeWrapper("Unsafe_SetNativeAddress");
607 void* p = addr_from_java(addr);
608 *(void**)p = addr_from_java(x);
609 UNSAFE_END
610
611
612 ////// Allocation requests
613
614 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
615 UnsafeWrapper("Unsafe_AllocateInstance");
616 {
617 ThreadToNativeFromVM ttnfv(thread);
618 return env->AllocObject(cls);
619 }
620 UNSAFE_END
621
622 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
623 UnsafeWrapper("Unsafe_AllocateMemory");
624 size_t sz = (size_t)size;
625 if (sz != (julong)size || size < 0) {
626 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
627 }
628 if (sz == 0) {
629 return 0;
630 }
631 sz = round_to(sz, HeapWordSize);
632 void* x = os::malloc(sz, mtInternal);
633 if (x == NULL) {
634 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
635 }
636 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
637 return addr_to_java(x);
638 UNSAFE_END
639
640 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
641 UnsafeWrapper("Unsafe_ReallocateMemory");
642 void* p = addr_from_java(addr);
643 size_t sz = (size_t)size;
644 if (sz != (julong)size || size < 0) {
645 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
646 }
647 if (sz == 0) {
648 os::free(p);
649 return 0;
650 }
651 sz = round_to(sz, HeapWordSize);
652 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal);
653 if (x == NULL) {
654 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
655 }
656 return addr_to_java(x);
657 UNSAFE_END
658
659 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
660 UnsafeWrapper("Unsafe_FreeMemory");
661 void* p = addr_from_java(addr);
662 if (p == NULL) {
663 return;
664 }
665 os::free(p);
666 UNSAFE_END
667
668 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
669 UnsafeWrapper("Unsafe_SetMemory");
670 size_t sz = (size_t)size;
671 if (sz != (julong)size || size < 0) {
672 THROW(vmSymbols::java_lang_IllegalArgumentException());
673 }
674 char* p = (char*) addr_from_java(addr);
675 Copy::fill_to_memory_atomic(p, sz, value);
676 UNSAFE_END
677
678 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
679 UnsafeWrapper("Unsafe_SetMemory");
680 size_t sz = (size_t)size;
681 if (sz != (julong)size || size < 0) {
682 THROW(vmSymbols::java_lang_IllegalArgumentException());
683 }
684 oop base = JNIHandles::resolve(obj);
685 void* p = index_oop_from_field_offset_long(base, offset);
686 Copy::fill_to_memory_atomic(p, sz, value);
687 UNSAFE_END
688
689 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, 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 void* src = addr_from_java(srcAddr);
699 void* dst = addr_from_java(dstAddr);
700 Copy::conjoint_memory_atomic(src, dst, sz);
701 UNSAFE_END
702
703 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
704 UnsafeWrapper("Unsafe_CopyMemory");
705 if (size == 0) {
706 return;
707 }
708 size_t sz = (size_t)size;
709 if (sz != (julong)size || size < 0) {
710 THROW(vmSymbols::java_lang_IllegalArgumentException());
711 }
712 oop srcp = JNIHandles::resolve(srcObj);
713 oop dstp = JNIHandles::resolve(dstObj);
714 if (dstp != NULL && !dstp->is_typeArray()) {
715 // NYI: This works only for non-oop arrays at present.
716 // Generalizing it would be reasonable, but requires card marking.
717 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
718 THROW(vmSymbols::java_lang_IllegalArgumentException());
719 }
720 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
721 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
722 Copy::conjoint_memory_atomic(src, dst, sz);
723 UNSAFE_END
724
725
726 ////// Random queries
727
728 // See comment at file start about UNSAFE_LEAF
729 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
730 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
731 UnsafeWrapper("Unsafe_AddressSize");
732 return sizeof(void*);
733 UNSAFE_END
734
735 // See comment at file start about UNSAFE_LEAF
736 //UNSAFE_LEAF(jint, Unsafe_PageSize())
737 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
738 UnsafeWrapper("Unsafe_PageSize");
739 return os::vm_page_size();
740 UNSAFE_END
741
742 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
743 if (field == NULL) {
744 THROW_0(vmSymbols::java_lang_NullPointerException());
745 }
746
747 oop reflected = JNIHandles::resolve_non_null(field);
748 oop mirror = java_lang_reflect_Field::clazz(reflected);
749 Klass* k = java_lang_Class::as_Klass(mirror);
750 int slot = java_lang_reflect_Field::slot(reflected);
751 int modifiers = java_lang_reflect_Field::modifiers(reflected);
752
753 if (must_be_static >= 0) {
754 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
755 if (must_be_static != really_is_static) {
756 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
757 }
758 }
759
760 int offset = InstanceKlass::cast(k)->field_offset(slot);
761 return field_offset_from_byte_offset(offset);
762 }
763
764 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
765 UnsafeWrapper("Unsafe_ObjectFieldOffset");
766 return find_field_offset(field, 0, THREAD);
767 UNSAFE_END
768
769 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
770 UnsafeWrapper("Unsafe_StaticFieldOffset");
771 return find_field_offset(field, 1, THREAD);
772 UNSAFE_END
773
774 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
775 UnsafeWrapper("Unsafe_StaticFieldBase");
776 // Note: In this VM implementation, a field address is always a short
777 // offset from the base of a a klass metaobject. Thus, the full dynamic
778 // range of the return type is never used. However, some implementations
779 // might put the static field inside an array shared by many classes,
780 // or even at a fixed address, in which case the address could be quite
781 // large. In that last case, this function would return NULL, since
782 // the address would operate alone, without any base pointer.
783
784 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
785
786 oop reflected = JNIHandles::resolve_non_null(field);
787 oop mirror = java_lang_reflect_Field::clazz(reflected);
788 int modifiers = java_lang_reflect_Field::modifiers(reflected);
789
790 if ((modifiers & JVM_ACC_STATIC) == 0) {
791 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
792 }
793
794 return JNIHandles::make_local(env, mirror);
795 UNSAFE_END
796
797 //@deprecated
798 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
799 UnsafeWrapper("Unsafe_FieldOffset");
800 // tries (but fails) to be polymorphic between static and non-static:
801 jlong offset = find_field_offset(field, -1, THREAD);
802 guarantee(offset == (jint)offset, "offset fits in 32 bits");
803 return (jint)offset;
804 UNSAFE_END
805
806 //@deprecated
807 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
808 UnsafeWrapper("Unsafe_StaticFieldBase");
809 if (clazz == NULL) {
810 THROW_0(vmSymbols::java_lang_NullPointerException());
811 }
812 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
813 UNSAFE_END
814
815 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
816 UnsafeWrapper("Unsafe_EnsureClassInitialized");
817 if (clazz == NULL) {
818 THROW(vmSymbols::java_lang_NullPointerException());
819 }
820 oop mirror = JNIHandles::resolve_non_null(clazz);
821
822 Klass* klass = java_lang_Class::as_Klass(mirror);
823 if (klass != NULL && klass->should_be_initialized()) {
824 InstanceKlass* k = InstanceKlass::cast(klass);
825 k->initialize(CHECK);
826 }
827 }
828 UNSAFE_END
829
830 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
831 UnsafeWrapper("Unsafe_ShouldBeInitialized");
832 if (clazz == NULL) {
833 THROW_(vmSymbols::java_lang_NullPointerException(), false);
834 }
835 oop mirror = JNIHandles::resolve_non_null(clazz);
836 Klass* klass = java_lang_Class::as_Klass(mirror);
837 if (klass != NULL && klass->should_be_initialized()) {
838 return true;
839 }
840 return false;
841 }
842 UNSAFE_END
843
844 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
845 if (acls == NULL) {
846 THROW(vmSymbols::java_lang_NullPointerException());
847 }
848 oop mirror = JNIHandles::resolve_non_null(acls);
849 Klass* k = java_lang_Class::as_Klass(mirror);
850 if (k == NULL || !k->oop_is_array()) {
851 THROW(vmSymbols::java_lang_InvalidClassException());
852 } else if (k->oop_is_objArray()) {
853 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
854 scale = heapOopSize;
855 } else if (k->oop_is_typeArray()) {
856 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
857 base = tak->array_header_in_bytes();
858 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
859 scale = (1 << tak->log2_element_size());
860 } else {
861 ShouldNotReachHere();
862 }
863 }
864
865 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
866 UnsafeWrapper("Unsafe_ArrayBaseOffset");
867 int base = 0, scale = 0;
868 getBaseAndScale(base, scale, acls, CHECK_0);
869 return field_offset_from_byte_offset(base);
870 UNSAFE_END
871
872
873 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
874 UnsafeWrapper("Unsafe_ArrayIndexScale");
875 int base = 0, scale = 0;
876 getBaseAndScale(base, scale, acls, CHECK_0);
877 // This VM packs both fields and array elements down to the byte.
878 // But watch out: If this changes, so that array references for
879 // a given primitive type (say, T_BOOLEAN) use different memory units
880 // than fields, this method MUST return zero for such arrays.
881 // For example, the VM used to store sub-word sized fields in full
882 // words in the object layout, so that accessors like getByte(Object,int)
883 // did not really do what one might expect for arrays. Therefore,
884 // this function used to report a zero scale factor, so that the user
885 // would know not to attempt to access sub-word array elements.
886 // // Code for unpacked fields:
887 // if (scale < wordSize) return 0;
888
889 // The following allows for a pretty general fieldOffset cookie scheme,
890 // but requires it to be linear in byte offset.
891 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
892 UNSAFE_END
893
894
895 static inline void throw_new(JNIEnv *env, const char *ename) {
896 char buf[100];
897 strcpy(buf, "java/lang/");
898 strcat(buf, ename);
899 jclass cls = env->FindClass(buf);
900 if (env->ExceptionCheck()) {
901 env->ExceptionClear();
902 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf);
903 return;
904 }
905 char* msg = NULL;
906 env->ThrowNew(cls, msg);
907 }
908
909 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
910 {
911 // Code lifted from JDK 1.3 ClassLoader.c
912
913 jbyte *body;
914 char *utfName;
915 jclass result = 0;
916 char buf[128];
917
918 if (UsePerfData) {
919 ClassLoader::unsafe_defineClassCallCounter()->inc();
920 }
921
922 if (data == NULL) {
923 throw_new(env, "NullPointerException");
924 return 0;
925 }
926
927 /* Work around 4153825. malloc crashes on Solaris when passed a
928 * negative size.
929 */
930 if (length < 0) {
931 throw_new(env, "ArrayIndexOutOfBoundsException");
932 return 0;
933 }
934
935 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
936
937 if (body == 0) {
938 throw_new(env, "OutOfMemoryError");
939 return 0;
940 }
941
942 env->GetByteArrayRegion(data, offset, length, body);
943
944 if (env->ExceptionOccurred())
945 goto free_body;
946
947 if (name != NULL) {
948 uint len = env->GetStringUTFLength(name);
949 int unicode_len = env->GetStringLength(name);
950 if (len >= sizeof(buf)) {
951 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
952 if (utfName == NULL) {
953 throw_new(env, "OutOfMemoryError");
954 goto free_body;
955 }
956 } else {
957 utfName = buf;
958 }
959 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
960 //VerifyFixClassname(utfName);
961 for (uint i = 0; i < len; i++) {
962 if (utfName[i] == '.') utfName[i] = '/';
963 }
964 } else {
965 utfName = NULL;
966 }
967
968 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
969
970 if (utfName && utfName != buf)
971 FREE_C_HEAP_ARRAY(char, utfName, mtInternal);
972
973 free_body:
974 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal);
975 return result;
976 }
977 }
978
979
980 UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
981 UnsafeWrapper("Unsafe_DefineClass");
982 {
983 ThreadToNativeFromVM ttnfv(thread);
984 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
985 }
986 UNSAFE_END
987
988 static jobject get_class_loader(JNIEnv* env, jclass cls) {
989 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
990 return NULL;
991 }
992 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
993 oop loader = k->class_loader();
994 return JNIHandles::make_local(env, loader);
995 }
996
997 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
998 UnsafeWrapper("Unsafe_DefineClass");
999 {
1000 ThreadToNativeFromVM ttnfv(thread);
1001
1002 int depthFromDefineClass0 = 1;
1003 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
1004 jobject loader = (caller == NULL) ? NULL : get_class_loader(env, caller);
1005 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
1006
1007 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
1008 }
1009 UNSAFE_END
1010
1011
1012 #define DAC_Args CLS"[B["OBJ
1013 // define a class but do not make it known to the class loader or system dictionary
1014 // - host_class: supplies context for linkage, access control, protection domain, and class loader
1015 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
1016 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
1017
1018 // When you load an anonymous class U, it works as if you changed its name just before loading,
1019 // to a name that you will never use again. Since the name is lost, no other class can directly
1020 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
1021 // through java.lang.Class methods like Class.newInstance.
1022
1023 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
1024 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
1025 // An anonymous class also has special privileges to access any member of its host class.
1026 // This is the main reason why this loading operation is unsafe. The purpose of this is to
1027 // allow language implementations to simulate "open classes"; a host class in effect gets
1028 // new code when an anonymous class is loaded alongside it. A less convenient but more
1029 // standard way to do this is with reflection, which can also be set to ignore access
1030 // restrictions.
1031
1032 // Access into an anonymous class is possible only through reflection. Therefore, there
1033 // are no special access rules for calling into an anonymous class. The relaxed access
1034 // rule for the host class is applied in the opposite direction: A host class reflectively
1035 // access one of its anonymous classes.
1036
1037 // If you load the same bytecodes twice, you get two different classes. You can reload
1038 // the same bytecodes with or without varying CP patches.
1039
1040 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
1041 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
1042 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
1043
1044 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
1045 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
1046 // It is not possible for a named class, or an older anonymous class, to refer by
1047 // name (via its CP) to a newer anonymous class.
1048
1049 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
1050 // or type descriptors used in the loaded anonymous class.
1051
1052 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
1053 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
1054 // be changed to println(greeting), where greeting is an arbitrary object created before
1055 // the anonymous class is loaded. This is useful in dynamic languages, in which
1056 // various kinds of metaobjects must be introduced as constants into bytecode.
1057 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
1058 // not just a literal string. For such ldc instructions, the verifier uses the
1059 // type Object instead of String, if the loaded constant is not in fact a String.
1060
1061 static instanceKlassHandle
1062 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
1063 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
1064 HeapWord* *temp_alloc,
1065 TRAPS) {
1066
1067 if (UsePerfData) {
1068 ClassLoader::unsafe_defineClassCallCounter()->inc();
1069 }
1070
1071 if (data == NULL) {
1072 THROW_0(vmSymbols::java_lang_NullPointerException());
1073 }
1074
1075 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
1076 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
1077 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal);
1078 if (body == NULL) {
1079 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1080 }
1081
1082 // caller responsible to free it:
1083 (*temp_alloc) = body;
1084
1085 {
1086 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1087 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1088 }
1089
1090 u1* class_bytes = (u1*) body;
1091 int class_bytes_length = (int) length;
1092 if (class_bytes_length < 0) class_bytes_length = 0;
1093 if (class_bytes == NULL
1094 || host_class == NULL
1095 || length != class_bytes_length)
1096 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1097
1098 objArrayHandle cp_patches_h;
1099 if (cp_patches_jh != NULL) {
1100 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1101 if (!p->is_objArray())
1102 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1103 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1104 }
1105
1106 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class)));
1107 const char* host_source = host_klass->external_name();
1108 Handle host_loader(THREAD, host_klass->class_loader());
1109 Handle host_domain(THREAD, host_klass->protection_domain());
1110
1111 GrowableArray<Handle>* cp_patches = NULL;
1112 if (cp_patches_h.not_null()) {
1113 int alen = cp_patches_h->length();
1114 for (int i = alen-1; i >= 0; i--) {
1115 oop p = cp_patches_h->obj_at(i);
1116 if (p != NULL) {
1117 Handle patch(THREAD, p);
1118 if (cp_patches == NULL)
1119 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1120 cp_patches->at_put(i, patch);
1121 }
1122 }
1123 }
1124
1125 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1126
1127 instanceKlassHandle anon_klass;
1128 {
1129 Symbol* no_class_name = NULL;
1130 Klass* anonk = SystemDictionary::parse_stream(no_class_name,
1131 host_loader, host_domain,
1132 &st, host_klass, cp_patches,
1133 CHECK_NULL);
1134 if (anonk == NULL) return NULL;
1135 anon_klass = instanceKlassHandle(THREAD, anonk);
1136 }
1137
1138 return anon_klass;
1139 }
1140
1141 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1142 {
1143 instanceKlassHandle anon_klass;
1144 jobject res_jh = NULL;
1145
1146 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1147 ResourceMark rm(THREAD);
1148
1149 HeapWord* temp_alloc = NULL;
1150
1151 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data,
1152 cp_patches_jh,
1153 &temp_alloc, THREAD);
1154 if (anon_klass() != NULL)
1155 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
1156
1157 // try/finally clause:
1158 if (temp_alloc != NULL) {
1159 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal);
1160 }
1161
1162 // The anonymous class loader data has been artificially been kept alive to
1163 // this point. The mirror and any instances of this class have to keep
1164 // it alive afterwards.
1165 if (anon_klass() != NULL) {
1166 anon_klass->class_loader_data()->set_keep_alive(false);
1167 }
1168
1169 // let caller initialize it as needed...
1170
1171 return (jclass) res_jh;
1172 }
1173 UNSAFE_END
1174
1175
1176
1177 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1178 UnsafeWrapper("Unsafe_MonitorEnter");
1179 {
1180 if (jobj == NULL) {
1181 THROW(vmSymbols::java_lang_NullPointerException());
1182 }
1183 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1184 ObjectSynchronizer::jni_enter(obj, CHECK);
1185 }
1186 UNSAFE_END
1187
1188
1189 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1190 UnsafeWrapper("Unsafe_TryMonitorEnter");
1191 {
1192 if (jobj == NULL) {
1193 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1194 }
1195 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1196 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1197 return (res ? JNI_TRUE : JNI_FALSE);
1198 }
1199 UNSAFE_END
1200
1201
1202 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1203 UnsafeWrapper("Unsafe_MonitorExit");
1204 {
1205 if (jobj == NULL) {
1206 THROW(vmSymbols::java_lang_NullPointerException());
1207 }
1208 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1209 ObjectSynchronizer::jni_exit(obj(), CHECK);
1210 }
1211 UNSAFE_END
1212
1213
1214 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1215 UnsafeWrapper("Unsafe_ThrowException");
1216 {
1217 ThreadToNativeFromVM ttnfv(thread);
1218 env->Throw(thr);
1219 }
1220 UNSAFE_END
1221
1222 // JSR166 ------------------------------------------------------------------
1223
1224 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1225 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1226 oop x = JNIHandles::resolve(x_h);
1227 oop e = JNIHandles::resolve(e_h);
1228 oop p = JNIHandles::resolve(obj);
1229 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1230 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
1231 jboolean success = (res == e);
1232 if (success)
1233 update_barrier_set((void*)addr, x);
1234 return success;
1235 UNSAFE_END
1236
1237 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1238 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1239 oop p = JNIHandles::resolve(obj);
1240 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1241 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1242 UNSAFE_END
1243
1244 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1245 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1246 Handle p (THREAD, JNIHandles::resolve(obj));
1247 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1248 #ifdef SUPPORTS_NATIVE_CX8
1249 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1250 #else
1251 if (VM_Version::supports_cx8())
1252 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1253 else {
1254 jboolean success = false;
1255 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
1256 jlong val = Atomic::load(addr);
1257 if (val == e) { Atomic::store(x, addr); success = true; }
1258 return success;
1259 }
1260 #endif
1261 UNSAFE_END
1262
1263 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1264 UnsafeWrapper("Unsafe_Park");
1265 EventThreadPark event;
1266 #ifndef USDT2
1267 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1268 #else /* USDT2 */
1269 HOTSPOT_THREAD_PARK_BEGIN(
1270 (uintptr_t) thread->parker(), (int) isAbsolute, time);
1271 #endif /* USDT2 */
1272 JavaThreadParkedState jtps(thread, time != 0);
1273 thread->parker()->park(isAbsolute != 0, time);
1274 #ifndef USDT2
1275 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1276 #else /* USDT2 */
1277 HOTSPOT_THREAD_PARK_END(
1278 (uintptr_t) thread->parker());
1279 #endif /* USDT2 */
1280 if (event.should_commit()) {
1281 oop obj = thread->current_park_blocker();
1282 event.set_klass((obj != NULL) ? obj->klass() : NULL);
1283 event.set_timeout(time);
1284 event.set_address((obj != NULL) ? (TYPE_ADDRESS) cast_from_oop<uintptr_t>(obj) : 0);
1285 event.commit();
1286 }
1287 UNSAFE_END
1288
1289 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1290 UnsafeWrapper("Unsafe_Unpark");
1291 Parker* p = NULL;
1292 oop java_thread = NULL;
1293 JavaThread* thr = NULL;
1294 if (jthread != NULL) {
1295 java_thread = JNIHandles::resolve_non_null(jthread);
1296 if (java_thread != NULL) {
1297 thr = java_lang_Thread::thread(java_thread);
1298 jlong lp = java_lang_Thread::park_event(java_thread);
1299 if (lp != 0) {
1300 // This cast is OK even though the jlong might have been read
1301 // non-atomically on 32bit systems, since there, one word will
1302 // always be zero anyway and the value set is always the same
1303 p = (Parker*)addr_from_java(lp);
1304 } else {
1305 // Grab lock if apparently null or using older version of library
1306 MutexLocker mu(Threads_lock);
1307 java_thread = JNIHandles::resolve_non_null(jthread);
1308 if (java_thread != NULL) {
1309 thr = java_lang_Thread::thread(java_thread);
1310 if (thr != NULL) {
1311 p = thr->parker();
1312 if (p != NULL) { // Bind to Java thread for next time.
1313 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1314 }
1315 }
1316 }
1317 }
1318 }
1319 }
1320 if (p != NULL && thr != NULL) {
1321 #ifndef USDT2
1322 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1323 #else /* USDT2 */
1324 HOTSPOT_THREAD_UNPARK(
1325 (uintptr_t) p);
1326 #endif /* USDT2 */
1327 p->unpark(thr);
1328 }
1329 UNSAFE_END
1330
1331 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1332 UnsafeWrapper("Unsafe_Loadavg");
1333 const int max_nelem = 3;
1334 double la[max_nelem];
1335 jint ret;
1336
1337 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1338 assert(a->is_typeArray(), "must be type array");
1339
1340 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1341 ThreadToNativeFromVM ttnfv(thread);
1342 throw_new(env, "ArrayIndexOutOfBoundsException");
1343 return -1;
1344 }
1345
1346 ret = os::loadavg(la, nelem);
1347 if (ret == -1) return -1;
1348
1349 // if successful, ret is the number of samples actually retrieved.
1350 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1351 switch(ret) {
1352 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1353 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1354 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1355 }
1356 return ret;
1357 UNSAFE_END
1358
1359 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1360 UnsafeWrapper("Unsafe_PrefetchRead");
1361 oop p = JNIHandles::resolve(obj);
1362 void* addr = index_oop_from_field_offset_long(p, 0);
1363 Prefetch::read(addr, (intx)offset);
1364 UNSAFE_END
1365
1366 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1367 UnsafeWrapper("Unsafe_PrefetchWrite");
1368 oop p = JNIHandles::resolve(obj);
1369 void* addr = index_oop_from_field_offset_long(p, 0);
1370 Prefetch::write(addr, (intx)offset);
1371 UNSAFE_END
1372
1373
1374 /// JVM_RegisterUnsafeMethods
1375
1376 #define ADR "J"
1377
1378 #define LANG "Ljava/lang/"
1379
1380 #define OBJ LANG"Object;"
1381 #define CLS LANG"Class;"
1382 #define CTR LANG"reflect/Constructor;"
1383 #define FLD LANG"reflect/Field;"
1384 #define MTH LANG"reflect/Method;"
1385 #define THR LANG"Throwable;"
1386
1387 #define DC0_Args LANG"String;[BII"
1388 #define DC_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1389
1390 #define CC (char*) /*cast a literal from (const char*)*/
1391 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1392
1393 // define deprecated accessors for compabitility with 1.4.0
1394 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1395 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1396 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1397
1398 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1399 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1400 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1401 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1402
1403 // Note: In 1.5.0, there are volatile versions too
1404 #define DECLARE_GETSETOOP(Boolean, Z) \
1405 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1406 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1407 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1408 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1409
1410
1411 #define DECLARE_GETSETNATIVE(Byte, B) \
1412 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1413 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1414
1415
1416
1417 // These are the methods for 1.4.0
1418 static JNINativeMethod methods_140[] = {
1419 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)},
1420 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)},
1421
1422 DECLARE_GETSETOOP_140(Boolean, Z),
1423 DECLARE_GETSETOOP_140(Byte, B),
1424 DECLARE_GETSETOOP_140(Short, S),
1425 DECLARE_GETSETOOP_140(Char, C),
1426 DECLARE_GETSETOOP_140(Int, I),
1427 DECLARE_GETSETOOP_140(Long, J),
1428 DECLARE_GETSETOOP_140(Float, F),
1429 DECLARE_GETSETOOP_140(Double, D),
1430
1431 DECLARE_GETSETNATIVE(Byte, B),
1432 DECLARE_GETSETNATIVE(Short, S),
1433 DECLARE_GETSETNATIVE(Char, C),
1434 DECLARE_GETSETNATIVE(Int, I),
1435 DECLARE_GETSETNATIVE(Long, J),
1436 DECLARE_GETSETNATIVE(Float, F),
1437 DECLARE_GETSETNATIVE(Double, D),
1438
1439 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1440 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1441
1442 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1443 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1444 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1445
1446 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)},
1447 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)},
1448 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1449 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1450 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1451 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1452 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1453
1454 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1455 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1456 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1457 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1458 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1459 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1460 };
1461
1462 // These are the methods prior to the JSR 166 changes in 1.5.0
1463 static JNINativeMethod methods_141[] = {
1464 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1465 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1466
1467 DECLARE_GETSETOOP_141(Boolean, Z),
1468 DECLARE_GETSETOOP_141(Byte, B),
1469 DECLARE_GETSETOOP_141(Short, S),
1470 DECLARE_GETSETOOP_141(Char, C),
1471 DECLARE_GETSETOOP_141(Int, I),
1472 DECLARE_GETSETOOP_141(Long, J),
1473 DECLARE_GETSETOOP_141(Float, F),
1474 DECLARE_GETSETOOP_141(Double, D),
1475
1476 DECLARE_GETSETNATIVE(Byte, B),
1477 DECLARE_GETSETNATIVE(Short, S),
1478 DECLARE_GETSETNATIVE(Char, C),
1479 DECLARE_GETSETNATIVE(Int, I),
1480 DECLARE_GETSETNATIVE(Long, J),
1481 DECLARE_GETSETNATIVE(Float, F),
1482 DECLARE_GETSETNATIVE(Double, D),
1483
1484 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1485 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1486
1487 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1488 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1489 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1490
1491 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1492 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1493 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1494 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1495 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1496 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1497 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1498 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1499
1500 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1501 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1502 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1503 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1504 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1505 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1506
1507 };
1508
1509 // These are the methods prior to the JSR 166 changes in 1.6.0
1510 static JNINativeMethod methods_15[] = {
1511 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1512 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1513 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1514 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1515
1516
1517 DECLARE_GETSETOOP(Boolean, Z),
1518 DECLARE_GETSETOOP(Byte, B),
1519 DECLARE_GETSETOOP(Short, S),
1520 DECLARE_GETSETOOP(Char, C),
1521 DECLARE_GETSETOOP(Int, I),
1522 DECLARE_GETSETOOP(Long, J),
1523 DECLARE_GETSETOOP(Float, F),
1524 DECLARE_GETSETOOP(Double, D),
1525
1526 DECLARE_GETSETNATIVE(Byte, B),
1527 DECLARE_GETSETNATIVE(Short, S),
1528 DECLARE_GETSETNATIVE(Char, C),
1529 DECLARE_GETSETNATIVE(Int, I),
1530 DECLARE_GETSETNATIVE(Long, J),
1531 DECLARE_GETSETNATIVE(Float, F),
1532 DECLARE_GETSETNATIVE(Double, D),
1533
1534 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1535 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1536
1537 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1538 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1539 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1540
1541 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1542 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1543 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1544 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1545 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1546 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1547 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1548 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1549
1550 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1551 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1552 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1553 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1554 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1555 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1556 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1557 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1558 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1559 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1560 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1561
1562 };
1563
1564 // These are the methods for 1.6.0 and 1.7.0
1565 static JNINativeMethod methods_16[] = {
1566 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1567 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1568 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1569 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1570
1571 DECLARE_GETSETOOP(Boolean, Z),
1572 DECLARE_GETSETOOP(Byte, B),
1573 DECLARE_GETSETOOP(Short, S),
1574 DECLARE_GETSETOOP(Char, C),
1575 DECLARE_GETSETOOP(Int, I),
1576 DECLARE_GETSETOOP(Long, J),
1577 DECLARE_GETSETOOP(Float, F),
1578 DECLARE_GETSETOOP(Double, D),
1579
1580 DECLARE_GETSETNATIVE(Byte, B),
1581 DECLARE_GETSETNATIVE(Short, S),
1582 DECLARE_GETSETNATIVE(Char, C),
1583 DECLARE_GETSETNATIVE(Int, I),
1584 DECLARE_GETSETNATIVE(Long, J),
1585 DECLARE_GETSETNATIVE(Float, F),
1586 DECLARE_GETSETNATIVE(Double, D),
1587
1588 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1589 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1590
1591 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1592 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1593 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1594
1595 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1596 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1597 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1598 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1599 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1600 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1601 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1602 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1603
1604 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1605 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1606 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1607 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1608 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1609 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1610 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1611 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1612 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1613 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1614 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1615 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1616 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1617 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1618 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1619 };
1620
1621 // These are the methods for 1.8.0
1622 static JNINativeMethod methods_18[] = {
1623 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1624 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1625 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1626 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1627
1628 DECLARE_GETSETOOP(Boolean, Z),
1629 DECLARE_GETSETOOP(Byte, B),
1630 DECLARE_GETSETOOP(Short, S),
1631 DECLARE_GETSETOOP(Char, C),
1632 DECLARE_GETSETOOP(Int, I),
1633 DECLARE_GETSETOOP(Long, J),
1634 DECLARE_GETSETOOP(Float, F),
1635 DECLARE_GETSETOOP(Double, D),
1636
1637 DECLARE_GETSETNATIVE(Byte, B),
1638 DECLARE_GETSETNATIVE(Short, S),
1639 DECLARE_GETSETNATIVE(Char, C),
1640 DECLARE_GETSETNATIVE(Int, I),
1641 DECLARE_GETSETNATIVE(Long, J),
1642 DECLARE_GETSETNATIVE(Float, F),
1643 DECLARE_GETSETNATIVE(Double, D),
1644
1645 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1646 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1647
1648 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1649 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1650 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1651
1652 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1653 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1654 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1655 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1656 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1657 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1658 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1659 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1660
1661 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1662 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1663 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1664 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1665 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1666 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1667 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1668 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1669 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1670 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1671 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1672 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1673 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1674 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1675 };
1676
1677 JNINativeMethod loadavg_method[] = {
1678 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1679 };
1680
1681 JNINativeMethod prefetch_methods[] = {
1682 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1683 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1684 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1685 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1686 };
1687
1688 JNINativeMethod memcopy_methods_17[] = {
1689 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1690 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1691 };
1692
1693 JNINativeMethod memcopy_methods_15[] = {
1694 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1695 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1696 };
1697
1698 JNINativeMethod anonk_methods[] = {
1699 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1700 };
1701
1702 JNINativeMethod lform_methods[] = {
1703 {CC"shouldBeInitialized",CC"("CLS")Z", FN_PTR(Unsafe_ShouldBeInitialized)},
1704 };
1705
1706 JNINativeMethod fence_methods[] = {
1707 {CC"loadFence", CC"()V", FN_PTR(Unsafe_LoadFence)},
1708 {CC"storeFence", CC"()V", FN_PTR(Unsafe_StoreFence)},
1709 {CC"fullFence", CC"()V", FN_PTR(Unsafe_FullFence)},
1710 };
1711
1712 #undef CC
1713 #undef FN_PTR
1714
1715 #undef ADR
1716 #undef LANG
1717 #undef OBJ
1718 #undef CLS
1719 #undef CTR
1720 #undef FLD
1721 #undef MTH
1722 #undef THR
1723 #undef DC0_Args
1724 #undef DC_Args
1725
1726 #undef DECLARE_GETSETOOP
1727 #undef DECLARE_GETSETNATIVE
1728
1729
1730 /**
1731 * Helper method to register native methods.
1732 */
1733 static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1734 int status = env->RegisterNatives(clazz, methods, nMethods);
1735 if (status < 0 || env->ExceptionOccurred()) {
1736 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1737 tty->print_cr("Unsafe: failed registering %s", message);
1738 }
1739 env->ExceptionClear();
1740 return false;
1741 } else {
1742 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1743 tty->print_cr("Unsafe: successfully registered %s", message);
1744 }
1745 return true;
1746 }
1747 }
1748
1749
1750 // This one function is exported, used by NativeLookup.
1751 // The Unsafe_xxx functions above are called only from the interpreter.
1752 // The optimizer looks at names and signatures to recognize
1753 // individual functions.
1754
1755 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1756 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1757 {
1758 ThreadToNativeFromVM ttnfv(thread);
1759
1760 // Unsafe methods
1761 {
1762 bool success = false;
1763 // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6
1764 if (!success) {
1765 success = register_natives("1.6 methods", env, unsafecls, methods_16, sizeof(methods_16)/sizeof(JNINativeMethod));
1766 }
1767 if (!success) {
1768 success = register_natives("1.8 methods", env, unsafecls, methods_18, sizeof(methods_18)/sizeof(JNINativeMethod));
1769 }
1770 if (!success) {
1771 success = register_natives("1.5 methods", env, unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1772 }
1773 if (!success) {
1774 success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1775 }
1776 if (!success) {
1777 success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1778 }
1779 guarantee(success, "register unsafe natives");
1780 }
1781
1782 // Unsafe.getLoadAverage
1783 register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1784
1785 // Prefetch methods
1786 register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1787
1788 // Memory copy methods
1789 {
1790 bool success = false;
1791 if (!success) {
1792 success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod));
1793 }
1794 if (!success) {
1795 success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1796 }
1797 }
1798
1799 // Unsafe.defineAnonymousClass
1800 if (EnableInvokeDynamic) {
1801 register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1802 }
1803
1804 // Unsafe.shouldBeInitialized
1805 if (EnableInvokeDynamic) {
1806 register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod));
1807 }
1808
1809 // Fence methods
1810 register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod));
1811 }
1812 JVM_END