1 /*
2 * Copyright (c) 2000, 2013, 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/reflection.hpp"
37 #include "runtime/synchronizer.hpp"
38 #include "services/threadService.hpp"
39 #include "trace/tracing.hpp"
40 #include "utilities/copy.hpp"
41 #include "utilities/dtrace.hpp"
42
43 /*
44 * Implementation of class sun.misc.Unsafe
45 */
46
47 #ifndef USDT2
48 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long);
49 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t);
50 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t);
51 #endif /* !USDT2 */
52
53 #define MAX_OBJECT_SIZE \
54 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
55 + ((julong)max_jint * sizeof(double)) )
56
57
58 #define UNSAFE_ENTRY(result_type, header) \
59 JVM_ENTRY(result_type, header)
60
61 // Can't use UNSAFE_LEAF because it has the signature of a straight
62 // call into the runtime (just like JVM_LEAF, funny that) but it's
63 // called like a Java Native and thus the wrapper built for it passes
64 // arguments like a JNI call. It expects those arguments to be popped
65 // from the stack on Intel like all good JNI args are, and adjusts the
66 // stack according. Since the JVM_LEAF call expects no extra
67 // arguments the stack isn't popped in the C code, is pushed by the
68 // wrapper and we get sick.
69 //#define UNSAFE_LEAF(result_type, header) \
70 // JVM_LEAF(result_type, header)
71
72 #define UNSAFE_END JVM_END
73
74 #define UnsafeWrapper(arg) /*nothing, for the present*/
75
76
77 inline void* addr_from_java(jlong addr) {
78 // This assert fails in a variety of ways on 32-bit systems.
79 // It is impossible to predict whether native code that converts
80 // pointers to longs will sign-extend or zero-extend the addresses.
81 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
82 return (void*)(uintptr_t)addr;
83 }
84
85 inline jlong addr_to_java(void* p) {
86 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
87 return (uintptr_t)p;
88 }
89
90
91 // Note: The VM's obj_field and related accessors use byte-scaled
92 // ("unscaled") offsets, just as the unsafe methods do.
93
94 // However, the method Unsafe.fieldOffset explicitly declines to
95 // guarantee this. The field offset values manipulated by the Java user
96 // through the Unsafe API are opaque cookies that just happen to be byte
97 // offsets. We represent this state of affairs by passing the cookies
98 // through conversion functions when going between the VM and the Unsafe API.
99 // The conversion functions just happen to be no-ops at present.
100
101 inline jlong field_offset_to_byte_offset(jlong field_offset) {
102 return field_offset;
103 }
104
105 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
106 return byte_offset;
107 }
108
109 inline jint invocation_key_from_method_slot(jint slot) {
110 return slot;
111 }
112
113 inline jint invocation_key_to_method_slot(jint key) {
114 return key;
115 }
116
117 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
118 jlong byte_offset = field_offset_to_byte_offset(field_offset);
119 #ifdef ASSERT
120 if (p != NULL) {
121 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
122 if (byte_offset == (jint)byte_offset) {
123 void* ptr_plus_disp = (address)p + byte_offset;
124 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
125 "raw [ptr+disp] must be consistent with oop::field_base");
126 }
127 jlong p_size = HeapWordSize * (jlong)(p->size());
128 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size));
129 }
130 #endif
131 if (sizeof(char*) == sizeof(jint)) // (this constant folds!)
132 return (address)p + (jint) byte_offset;
133 else
134 return (address)p + byte_offset;
135 }
136
137 // Externally callable versions:
138 // (Use these in compiler intrinsics which emulate unsafe primitives.)
139 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
140 return field_offset;
141 }
142 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
143 return byte_offset;
144 }
145 jint Unsafe_invocation_key_from_method_slot(jint slot) {
146 return invocation_key_from_method_slot(slot);
147 }
148 jint Unsafe_invocation_key_to_method_slot(jint key) {
149 return invocation_key_to_method_slot(key);
150 }
151
152
153 ///// Data in the Java heap.
154
155 #define GET_FIELD(obj, offset, type_name, v) \
156 oop p = JNIHandles::resolve(obj); \
157 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
158
159 #define SET_FIELD(obj, offset, type_name, x) \
160 oop p = JNIHandles::resolve(obj); \
161 *(type_name*)index_oop_from_field_offset_long(p, offset) = x
162
163 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
164 oop p = JNIHandles::resolve(obj); \
165 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
166
167 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
168 oop p = JNIHandles::resolve(obj); \
169 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x);
170
171 // Macros for oops that check UseCompressedOops
172
173 #define GET_OOP_FIELD(obj, offset, v) \
174 oop p = JNIHandles::resolve(obj); \
175 oop v; \
176 if (UseCompressedOops) { \
177 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
178 v = oopDesc::decode_heap_oop(n); \
179 } else { \
180 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
181 }
182
183
184 // Get/SetObject must be special-cased, since it works with handles.
185
186 // The xxx140 variants for backward compatibility do not allow a full-width offset.
187 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
188 UnsafeWrapper("Unsafe_GetObject");
189 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
190 GET_OOP_FIELD(obj, offset, v)
191 jobject ret = JNIHandles::make_local(env, v);
192 #if INCLUDE_ALL_GCS
193 // We could be accessing the referent field in a reference
194 // object. If G1 is enabled then we need to register a non-null
195 // referent with the SATB barrier.
196 if (UseG1GC) {
197 bool needs_barrier = false;
198
199 if (ret != NULL) {
200 if (offset == java_lang_ref_Reference::referent_offset) {
201 oop o = JNIHandles::resolve_non_null(obj);
202 Klass* k = o->klass();
203 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
204 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
205 needs_barrier = true;
206 }
207 }
208 }
209
210 if (needs_barrier) {
211 oop referent = JNIHandles::resolve(ret);
212 G1SATBCardTableModRefBS::enqueue(referent);
213 }
214 }
215 #endif // INCLUDE_ALL_GCS
216 return ret;
217 UNSAFE_END
218
219 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
220 UnsafeWrapper("Unsafe_SetObject");
221 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
222 oop x = JNIHandles::resolve(x_h);
223 //SET_FIELD(obj, offset, oop, x);
224 oop p = JNIHandles::resolve(obj);
225 if (UseCompressedOops) {
226 if (x != NULL) {
227 // If there is a heap base pointer, we are obliged to emit a store barrier.
228 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
229 } else {
230 narrowOop n = oopDesc::encode_heap_oop_not_null(x);
231 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
232 }
233 } else {
234 if (x != NULL) {
235 // If there is a heap base pointer, we are obliged to emit a store barrier.
236 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
237 } else {
238 *(oop*)index_oop_from_field_offset_long(p, offset) = x;
239 }
240 }
241 UNSAFE_END
242
243 // The normal variants allow a null base pointer with an arbitrary address.
244 // But if the base pointer is non-null, the offset should make some sense.
245 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
246 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
247 UnsafeWrapper("Unsafe_GetObject");
248 GET_OOP_FIELD(obj, offset, v)
249 jobject ret = JNIHandles::make_local(env, v);
250 #if INCLUDE_ALL_GCS
251 // We could be accessing the referent field in a reference
252 // object. If G1 is enabled then we need to register non-null
253 // referent with the SATB barrier.
254 if (UseG1GC) {
255 bool needs_barrier = false;
256
257 if (ret != NULL) {
258 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) {
259 oop o = JNIHandles::resolve(obj);
260 Klass* k = o->klass();
261 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
262 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
263 needs_barrier = true;
264 }
265 }
266 }
267
268 if (needs_barrier) {
269 oop referent = JNIHandles::resolve(ret);
270 G1SATBCardTableModRefBS::enqueue(referent);
271 }
272 }
273 #endif // INCLUDE_ALL_GCS
274 return ret;
275 UNSAFE_END
276
277 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
278 UnsafeWrapper("Unsafe_SetObject");
279 oop x = JNIHandles::resolve(x_h);
280 oop p = JNIHandles::resolve(obj);
281 if (UseCompressedOops) {
282 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
283 } else {
284 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
285 }
286 UNSAFE_END
287
288 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
289 UnsafeWrapper("Unsafe_GetObjectVolatile");
290 oop p = JNIHandles::resolve(obj);
291 void* addr = index_oop_from_field_offset_long(p, offset);
292 volatile oop v;
293 if (UseCompressedOops) {
294 volatile narrowOop n = *(volatile narrowOop*) addr;
295 (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n));
296 } else {
297 (void)const_cast<oop&>(v = *(volatile oop*) addr);
298 }
299 OrderAccess::acquire();
300 return JNIHandles::make_local(env, v);
301 UNSAFE_END
302
303 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
304 UnsafeWrapper("Unsafe_SetObjectVolatile");
305 oop x = JNIHandles::resolve(x_h);
306 oop p = JNIHandles::resolve(obj);
307 void* addr = index_oop_from_field_offset_long(p, offset);
308 OrderAccess::release();
309 if (UseCompressedOops) {
310 oop_store((narrowOop*)addr, x);
311 } else {
312 oop_store((oop*)addr, x);
313 }
314 OrderAccess::fence();
315 UNSAFE_END
316
317 #ifndef SUPPORTS_NATIVE_CX8
318 // Keep old code for platforms which may not have atomic jlong (8 bytes) instructions
319
320 // Volatile long versions must use locks if !VM_Version::supports_cx8().
321 // support_cx8 is a surrogate for 'supports atomic long memory ops'.
322
323 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
324 UnsafeWrapper("Unsafe_GetLongVolatile");
325 {
326 if (VM_Version::supports_cx8()) {
327 GET_FIELD_VOLATILE(obj, offset, jlong, v);
328 return v;
329 }
330 else {
331 Handle p (THREAD, JNIHandles::resolve(obj));
332 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
333 ObjectLocker ol(p, THREAD);
334 jlong value = *addr;
335 return value;
336 }
337 }
338 UNSAFE_END
339
340 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
341 UnsafeWrapper("Unsafe_SetLongVolatile");
342 {
343 if (VM_Version::supports_cx8()) {
344 SET_FIELD_VOLATILE(obj, offset, jlong, x);
345 }
346 else {
347 Handle p (THREAD, JNIHandles::resolve(obj));
348 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
349 ObjectLocker ol(p, THREAD);
350 *addr = x;
351 }
352 }
353 UNSAFE_END
354
355 #endif // not SUPPORTS_NATIVE_CX8
356
357 #define DEFINE_GETSETOOP(jboolean, Boolean) \
358 \
359 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
360 UnsafeWrapper("Unsafe_Get"#Boolean); \
361 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
362 GET_FIELD(obj, offset, jboolean, v); \
363 return v; \
364 UNSAFE_END \
365 \
366 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
367 UnsafeWrapper("Unsafe_Set"#Boolean); \
368 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
369 SET_FIELD(obj, offset, jboolean, x); \
370 UNSAFE_END \
371 \
372 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
373 UnsafeWrapper("Unsafe_Get"#Boolean); \
374 GET_FIELD(obj, offset, jboolean, v); \
375 return v; \
376 UNSAFE_END \
377 \
378 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
379 UnsafeWrapper("Unsafe_Set"#Boolean); \
380 SET_FIELD(obj, offset, jboolean, x); \
381 UNSAFE_END \
382 \
383 // END DEFINE_GETSETOOP.
384
385 DEFINE_GETSETOOP(jboolean, Boolean)
386 DEFINE_GETSETOOP(jbyte, Byte)
387 DEFINE_GETSETOOP(jshort, Short);
388 DEFINE_GETSETOOP(jchar, Char);
389 DEFINE_GETSETOOP(jint, Int);
390 DEFINE_GETSETOOP(jlong, Long);
391 DEFINE_GETSETOOP(jfloat, Float);
392 DEFINE_GETSETOOP(jdouble, Double);
393
394 #undef DEFINE_GETSETOOP
395
396 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
397 \
398 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
399 UnsafeWrapper("Unsafe_Get"#Boolean); \
400 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
401 return v; \
402 UNSAFE_END \
403 \
404 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
405 UnsafeWrapper("Unsafe_Set"#Boolean); \
406 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
407 UNSAFE_END \
408 \
409 // END DEFINE_GETSETOOP_VOLATILE.
410
411 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
412 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
413 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
414 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
415 DEFINE_GETSETOOP_VOLATILE(jint, Int);
416 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
417 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
418
419 #ifdef SUPPORTS_NATIVE_CX8
420 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
421 #endif
422
423 #undef DEFINE_GETSETOOP_VOLATILE
424
425 // The non-intrinsified versions of setOrdered just use setVolatile
426
427 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
428 UnsafeWrapper("Unsafe_SetOrderedInt");
429 SET_FIELD_VOLATILE(obj, offset, jint, x);
430 UNSAFE_END
431
432 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
433 UnsafeWrapper("Unsafe_SetOrderedObject");
434 oop x = JNIHandles::resolve(x_h);
435 oop p = JNIHandles::resolve(obj);
436 void* addr = index_oop_from_field_offset_long(p, offset);
437 OrderAccess::release();
438 if (UseCompressedOops) {
439 oop_store((narrowOop*)addr, x);
440 } else {
441 oop_store((oop*)addr, x);
442 }
443 OrderAccess::fence();
444 UNSAFE_END
445
446 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
447 UnsafeWrapper("Unsafe_SetOrderedLong");
448 #ifdef SUPPORTS_NATIVE_CX8
449 SET_FIELD_VOLATILE(obj, offset, jlong, x);
450 #else
451 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
452 {
453 if (VM_Version::supports_cx8()) {
454 SET_FIELD_VOLATILE(obj, offset, jlong, x);
455 }
456 else {
457 Handle p (THREAD, JNIHandles::resolve(obj));
458 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
459 ObjectLocker ol(p, THREAD);
460 *addr = x;
461 }
462 }
463 #endif
464 UNSAFE_END
465
466 UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe))
467 UnsafeWrapper("Unsafe_LoadFence");
468 OrderAccess::acquire();
469 UNSAFE_END
470
471 UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe))
472 UnsafeWrapper("Unsafe_StoreFence");
473 OrderAccess::release();
474 UNSAFE_END
475
476 UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe))
477 UnsafeWrapper("Unsafe_FullFence");
478 OrderAccess::fence();
479 UNSAFE_END
480
481 ////// Data in the C heap.
482
483 // Note: These do not throw NullPointerException for bad pointers.
484 // They just crash. Only a oop base pointer can generate a NullPointerException.
485 //
486 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
487 \
488 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
489 UnsafeWrapper("Unsafe_GetNative"#Type); \
490 void* p = addr_from_java(addr); \
491 JavaThread* t = JavaThread::current(); \
492 t->set_doing_unsafe_access(true); \
493 java_type x = *(volatile native_type*)p; \
494 t->set_doing_unsafe_access(false); \
495 return x; \
496 UNSAFE_END \
497 \
498 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
499 UnsafeWrapper("Unsafe_SetNative"#Type); \
500 JavaThread* t = JavaThread::current(); \
501 t->set_doing_unsafe_access(true); \
502 void* p = addr_from_java(addr); \
503 *(volatile native_type*)p = x; \
504 t->set_doing_unsafe_access(false); \
505 UNSAFE_END \
506 \
507 // END DEFINE_GETSETNATIVE.
508
509 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
510 DEFINE_GETSETNATIVE(jshort, Short, signed short);
511 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
512 DEFINE_GETSETNATIVE(jint, Int, jint);
513 // no long -- handled specially
514 DEFINE_GETSETNATIVE(jfloat, Float, float);
515 DEFINE_GETSETNATIVE(jdouble, Double, double);
516
517 #undef DEFINE_GETSETNATIVE
518
519 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
520 UnsafeWrapper("Unsafe_GetNativeLong");
521 JavaThread* t = JavaThread::current();
522 // We do it this way to avoid problems with access to heap using 64
523 // bit loads, as jlong in heap could be not 64-bit aligned, and on
524 // some CPUs (SPARC) it leads to SIGBUS.
525 t->set_doing_unsafe_access(true);
526 void* p = addr_from_java(addr);
527 jlong x;
528 if (((intptr_t)p & 7) == 0) {
529 // jlong is aligned, do a volatile access
530 x = *(volatile jlong*)p;
531 } else {
532 jlong_accessor acc;
533 acc.words[0] = ((volatile jint*)p)[0];
534 acc.words[1] = ((volatile jint*)p)[1];
535 x = acc.long_value;
536 }
537 t->set_doing_unsafe_access(false);
538 return x;
539 UNSAFE_END
540
541 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
542 UnsafeWrapper("Unsafe_SetNativeLong");
543 JavaThread* t = JavaThread::current();
544 // see comment for Unsafe_GetNativeLong
545 t->set_doing_unsafe_access(true);
546 void* p = addr_from_java(addr);
547 if (((intptr_t)p & 7) == 0) {
548 // jlong is aligned, do a volatile access
549 *(volatile jlong*)p = x;
550 } else {
551 jlong_accessor acc;
552 acc.long_value = x;
553 ((volatile jint*)p)[0] = acc.words[0];
554 ((volatile jint*)p)[1] = acc.words[1];
555 }
556 t->set_doing_unsafe_access(false);
557 UNSAFE_END
558
559
560 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
561 UnsafeWrapper("Unsafe_GetNativeAddress");
562 void* p = addr_from_java(addr);
563 return addr_to_java(*(void**)p);
564 UNSAFE_END
565
566 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
567 UnsafeWrapper("Unsafe_SetNativeAddress");
568 void* p = addr_from_java(addr);
569 *(void**)p = addr_from_java(x);
570 UNSAFE_END
571
572
573 ////// Allocation requests
574
575 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
576 UnsafeWrapper("Unsafe_AllocateInstance");
577 {
578 ThreadToNativeFromVM ttnfv(thread);
579 return env->AllocObject(cls);
580 }
581 UNSAFE_END
582
583 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
584 UnsafeWrapper("Unsafe_AllocateMemory");
585 size_t sz = (size_t)size;
586 if (sz != (julong)size || size < 0) {
587 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
588 }
589 if (sz == 0) {
590 return 0;
591 }
592 sz = round_to(sz, HeapWordSize);
593 void* x = os::malloc(sz, mtInternal);
594 if (x == NULL) {
595 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
596 }
597 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
598 return addr_to_java(x);
599 UNSAFE_END
600
601 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
602 UnsafeWrapper("Unsafe_ReallocateMemory");
603 void* p = addr_from_java(addr);
604 size_t sz = (size_t)size;
605 if (sz != (julong)size || size < 0) {
606 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
607 }
608 if (sz == 0) {
609 os::free(p);
610 return 0;
611 }
612 sz = round_to(sz, HeapWordSize);
613 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal);
614 if (x == NULL) {
615 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
616 }
617 return addr_to_java(x);
618 UNSAFE_END
619
620 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
621 UnsafeWrapper("Unsafe_FreeMemory");
622 void* p = addr_from_java(addr);
623 if (p == NULL) {
624 return;
625 }
626 os::free(p);
627 UNSAFE_END
628
629 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
630 UnsafeWrapper("Unsafe_SetMemory");
631 size_t sz = (size_t)size;
632 if (sz != (julong)size || size < 0) {
633 THROW(vmSymbols::java_lang_IllegalArgumentException());
634 }
635 char* p = (char*) addr_from_java(addr);
636 Copy::fill_to_memory_atomic(p, sz, value);
637 UNSAFE_END
638
639 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
640 UnsafeWrapper("Unsafe_SetMemory");
641 size_t sz = (size_t)size;
642 if (sz != (julong)size || size < 0) {
643 THROW(vmSymbols::java_lang_IllegalArgumentException());
644 }
645 oop base = JNIHandles::resolve(obj);
646 void* p = index_oop_from_field_offset_long(base, offset);
647 Copy::fill_to_memory_atomic(p, sz, value);
648 UNSAFE_END
649
650 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
651 UnsafeWrapper("Unsafe_CopyMemory");
652 if (size == 0) {
653 return;
654 }
655 size_t sz = (size_t)size;
656 if (sz != (julong)size || size < 0) {
657 THROW(vmSymbols::java_lang_IllegalArgumentException());
658 }
659 void* src = addr_from_java(srcAddr);
660 void* dst = addr_from_java(dstAddr);
661 Copy::conjoint_memory_atomic(src, dst, sz);
662 UNSAFE_END
663
664 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
665 UnsafeWrapper("Unsafe_CopyMemory");
666 if (size == 0) {
667 return;
668 }
669 size_t sz = (size_t)size;
670 if (sz != (julong)size || size < 0) {
671 THROW(vmSymbols::java_lang_IllegalArgumentException());
672 }
673 oop srcp = JNIHandles::resolve(srcObj);
674 oop dstp = JNIHandles::resolve(dstObj);
675 if (dstp != NULL && !dstp->is_typeArray()) {
676 // NYI: This works only for non-oop arrays at present.
677 // Generalizing it would be reasonable, but requires card marking.
678 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
679 THROW(vmSymbols::java_lang_IllegalArgumentException());
680 }
681 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
682 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
683 Copy::conjoint_memory_atomic(src, dst, sz);
684 UNSAFE_END
685
686
687 ////// Random queries
688
689 // See comment at file start about UNSAFE_LEAF
690 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
691 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
692 UnsafeWrapper("Unsafe_AddressSize");
693 return sizeof(void*);
694 UNSAFE_END
695
696 // See comment at file start about UNSAFE_LEAF
697 //UNSAFE_LEAF(jint, Unsafe_PageSize())
698 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
699 UnsafeWrapper("Unsafe_PageSize");
700 return os::vm_page_size();
701 UNSAFE_END
702
703 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
704 if (field == NULL) {
705 THROW_0(vmSymbols::java_lang_NullPointerException());
706 }
707
708 oop reflected = JNIHandles::resolve_non_null(field);
709 oop mirror = java_lang_reflect_Field::clazz(reflected);
710 Klass* k = java_lang_Class::as_Klass(mirror);
711 int slot = java_lang_reflect_Field::slot(reflected);
712 int modifiers = java_lang_reflect_Field::modifiers(reflected);
713
714 if (must_be_static >= 0) {
715 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
716 if (must_be_static != really_is_static) {
717 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
718 }
719 }
720
721 int offset = InstanceKlass::cast(k)->field_offset(slot);
722 return field_offset_from_byte_offset(offset);
723 }
724
725 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
726 UnsafeWrapper("Unsafe_ObjectFieldOffset");
727 return find_field_offset(field, 0, THREAD);
728 UNSAFE_END
729
730 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
731 UnsafeWrapper("Unsafe_StaticFieldOffset");
732 return find_field_offset(field, 1, THREAD);
733 UNSAFE_END
734
735 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
736 UnsafeWrapper("Unsafe_StaticFieldBase");
737 // Note: In this VM implementation, a field address is always a short
738 // offset from the base of a a klass metaobject. Thus, the full dynamic
739 // range of the return type is never used. However, some implementations
740 // might put the static field inside an array shared by many classes,
741 // or even at a fixed address, in which case the address could be quite
742 // large. In that last case, this function would return NULL, since
743 // the address would operate alone, without any base pointer.
744
745 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
746
747 oop reflected = JNIHandles::resolve_non_null(field);
748 oop mirror = java_lang_reflect_Field::clazz(reflected);
749 int modifiers = java_lang_reflect_Field::modifiers(reflected);
750
751 if ((modifiers & JVM_ACC_STATIC) == 0) {
752 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
753 }
754
755 return JNIHandles::make_local(env, mirror);
756 UNSAFE_END
757
758 //@deprecated
759 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
760 UnsafeWrapper("Unsafe_FieldOffset");
761 // tries (but fails) to be polymorphic between static and non-static:
762 jlong offset = find_field_offset(field, -1, THREAD);
763 guarantee(offset == (jint)offset, "offset fits in 32 bits");
764 return (jint)offset;
765 UNSAFE_END
766
767 //@deprecated
768 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
769 UnsafeWrapper("Unsafe_StaticFieldBase");
770 if (clazz == NULL) {
771 THROW_0(vmSymbols::java_lang_NullPointerException());
772 }
773 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
774 UNSAFE_END
775
776 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
777 UnsafeWrapper("Unsafe_EnsureClassInitialized");
778 if (clazz == NULL) {
779 THROW(vmSymbols::java_lang_NullPointerException());
780 }
781 oop mirror = JNIHandles::resolve_non_null(clazz);
782
783 Klass* klass = java_lang_Class::as_Klass(mirror);
784 if (klass != NULL && klass->should_be_initialized()) {
785 InstanceKlass* k = InstanceKlass::cast(klass);
786 k->initialize(CHECK);
787 }
788 }
789 UNSAFE_END
790
791 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
792 UnsafeWrapper("Unsafe_ShouldBeInitialized");
793 if (clazz == NULL) {
794 THROW_(vmSymbols::java_lang_NullPointerException(), false);
795 }
796 oop mirror = JNIHandles::resolve_non_null(clazz);
797 Klass* klass = java_lang_Class::as_Klass(mirror);
798 if (klass != NULL && klass->should_be_initialized()) {
799 return true;
800 }
801 return false;
802 }
803 UNSAFE_END
804
805 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
806 if (acls == NULL) {
807 THROW(vmSymbols::java_lang_NullPointerException());
808 }
809 oop mirror = JNIHandles::resolve_non_null(acls);
810 Klass* k = java_lang_Class::as_Klass(mirror);
811 if (k == NULL || !k->oop_is_array()) {
812 THROW(vmSymbols::java_lang_InvalidClassException());
813 } else if (k->oop_is_objArray()) {
814 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
815 scale = heapOopSize;
816 } else if (k->oop_is_typeArray()) {
817 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
818 base = tak->array_header_in_bytes();
819 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
820 scale = (1 << tak->log2_element_size());
821 } else {
822 ShouldNotReachHere();
823 }
824 }
825
826 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
827 UnsafeWrapper("Unsafe_ArrayBaseOffset");
828 int base, scale;
829 getBaseAndScale(base, scale, acls, CHECK_0);
830 return field_offset_from_byte_offset(base);
831 UNSAFE_END
832
833
834 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
835 UnsafeWrapper("Unsafe_ArrayIndexScale");
836 int base, scale;
837 getBaseAndScale(base, scale, acls, CHECK_0);
838 // This VM packs both fields and array elements down to the byte.
839 // But watch out: If this changes, so that array references for
840 // a given primitive type (say, T_BOOLEAN) use different memory units
841 // than fields, this method MUST return zero for such arrays.
842 // For example, the VM used to store sub-word sized fields in full
843 // words in the object layout, so that accessors like getByte(Object,int)
844 // did not really do what one might expect for arrays. Therefore,
845 // this function used to report a zero scale factor, so that the user
846 // would know not to attempt to access sub-word array elements.
847 // // Code for unpacked fields:
848 // if (scale < wordSize) return 0;
849
850 // The following allows for a pretty general fieldOffset cookie scheme,
851 // but requires it to be linear in byte offset.
852 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
853 UNSAFE_END
854
855
856 static inline void throw_new(JNIEnv *env, const char *ename) {
857 char buf[100];
858 strcpy(buf, "java/lang/");
859 strcat(buf, ename);
860 jclass cls = env->FindClass(buf);
861 char* msg = NULL;
862 env->ThrowNew(cls, msg);
863 }
864
865 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
866 {
867 // Code lifted from JDK 1.3 ClassLoader.c
868
869 jbyte *body;
870 char *utfName;
871 jclass result = 0;
872 char buf[128];
873
874 if (UsePerfData) {
875 ClassLoader::unsafe_defineClassCallCounter()->inc();
876 }
877
878 if (data == NULL) {
879 throw_new(env, "NullPointerException");
880 return 0;
881 }
882
883 /* Work around 4153825. malloc crashes on Solaris when passed a
884 * negative size.
885 */
886 if (length < 0) {
887 throw_new(env, "ArrayIndexOutOfBoundsException");
888 return 0;
889 }
890
891 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
892
893 if (body == 0) {
894 throw_new(env, "OutOfMemoryError");
895 return 0;
896 }
897
898 env->GetByteArrayRegion(data, offset, length, body);
899
900 if (env->ExceptionOccurred())
901 goto free_body;
902
903 if (name != NULL) {
904 uint len = env->GetStringUTFLength(name);
905 int unicode_len = env->GetStringLength(name);
906 if (len >= sizeof(buf)) {
907 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
908 if (utfName == NULL) {
909 throw_new(env, "OutOfMemoryError");
910 goto free_body;
911 }
912 } else {
913 utfName = buf;
914 }
915 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
916 //VerifyFixClassname(utfName);
917 for (uint i = 0; i < len; i++) {
918 if (utfName[i] == '.') utfName[i] = '/';
919 }
920 } else {
921 utfName = NULL;
922 }
923
924 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
925
926 if (utfName && utfName != buf)
927 FREE_C_HEAP_ARRAY(char, utfName, mtInternal);
928
929 free_body:
930 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal);
931 return result;
932 }
933 }
934
935
936 UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
937 UnsafeWrapper("Unsafe_DefineClass");
938 {
939 ThreadToNativeFromVM ttnfv(thread);
940 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
941 }
942 UNSAFE_END
943
944
945 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
946 UnsafeWrapper("Unsafe_DefineClass");
947 {
948 ThreadToNativeFromVM ttnfv(thread);
949
950 int depthFromDefineClass0 = 1;
951 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
952 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
953 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
954
955 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
956 }
957 UNSAFE_END
958
959
960 #define DAC_Args CLS"[B["OBJ
961 // define a class but do not make it known to the class loader or system dictionary
962 // - host_class: supplies context for linkage, access control, protection domain, and class loader
963 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
964 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
965
966 // When you load an anonymous class U, it works as if you changed its name just before loading,
967 // to a name that you will never use again. Since the name is lost, no other class can directly
968 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
969 // through java.lang.Class methods like Class.newInstance.
970
971 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
972 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
973 // An anonymous class also has special privileges to access any member of its host class.
974 // This is the main reason why this loading operation is unsafe. The purpose of this is to
975 // allow language implementations to simulate "open classes"; a host class in effect gets
976 // new code when an anonymous class is loaded alongside it. A less convenient but more
977 // standard way to do this is with reflection, which can also be set to ignore access
978 // restrictions.
979
980 // Access into an anonymous class is possible only through reflection. Therefore, there
981 // are no special access rules for calling into an anonymous class. The relaxed access
982 // rule for the host class is applied in the opposite direction: A host class reflectively
983 // access one of its anonymous classes.
984
985 // If you load the same bytecodes twice, you get two different classes. You can reload
986 // the same bytecodes with or without varying CP patches.
987
988 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
989 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
990 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
991
992 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
993 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
994 // It is not possible for a named class, or an older anonymous class, to refer by
995 // name (via its CP) to a newer anonymous class.
996
997 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
998 // or type descriptors used in the loaded anonymous class.
999
1000 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
1001 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
1002 // be changed to println(greeting), where greeting is an arbitrary object created before
1003 // the anonymous class is loaded. This is useful in dynamic languages, in which
1004 // various kinds of metaobjects must be introduced as constants into bytecode.
1005 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
1006 // not just a literal string. For such ldc instructions, the verifier uses the
1007 // type Object instead of String, if the loaded constant is not in fact a String.
1008
1009 static instanceKlassHandle
1010 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
1011 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
1012 HeapWord* *temp_alloc,
1013 TRAPS) {
1014
1015 if (UsePerfData) {
1016 ClassLoader::unsafe_defineClassCallCounter()->inc();
1017 }
1018
1019 if (data == NULL) {
1020 THROW_0(vmSymbols::java_lang_NullPointerException());
1021 }
1022
1023 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
1024 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
1025 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal);
1026 if (body == NULL) {
1027 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1028 }
1029
1030 // caller responsible to free it:
1031 (*temp_alloc) = body;
1032
1033 {
1034 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1035 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1036 }
1037
1038 u1* class_bytes = (u1*) body;
1039 int class_bytes_length = (int) length;
1040 if (class_bytes_length < 0) class_bytes_length = 0;
1041 if (class_bytes == NULL
1042 || host_class == NULL
1043 || length != class_bytes_length)
1044 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1045
1046 objArrayHandle cp_patches_h;
1047 if (cp_patches_jh != NULL) {
1048 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1049 if (!p->is_objArray())
1050 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1051 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1052 }
1053
1054 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class)));
1055 const char* host_source = host_klass->external_name();
1056 Handle host_loader(THREAD, host_klass->class_loader());
1057 Handle host_domain(THREAD, host_klass->protection_domain());
1058
1059 GrowableArray<Handle>* cp_patches = NULL;
1060 if (cp_patches_h.not_null()) {
1061 int alen = cp_patches_h->length();
1062 for (int i = alen-1; i >= 0; i--) {
1063 oop p = cp_patches_h->obj_at(i);
1064 if (p != NULL) {
1065 Handle patch(THREAD, p);
1066 if (cp_patches == NULL)
1067 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1068 cp_patches->at_put(i, patch);
1069 }
1070 }
1071 }
1072
1073 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1074
1075 instanceKlassHandle anon_klass;
1076 {
1077 Symbol* no_class_name = NULL;
1078 Klass* anonk = SystemDictionary::parse_stream(no_class_name,
1079 host_loader, host_domain,
1080 &st, host_klass, cp_patches,
1081 CHECK_NULL);
1082 if (anonk == NULL) return NULL;
1083 anon_klass = instanceKlassHandle(THREAD, anonk);
1084 }
1085
1086 return anon_klass;
1087 }
1088
1089 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1090 {
1091 instanceKlassHandle anon_klass;
1092 jobject res_jh = NULL;
1093
1094 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1095 ResourceMark rm(THREAD);
1096
1097 HeapWord* temp_alloc = NULL;
1098
1099 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data,
1100 cp_patches_jh,
1101 &temp_alloc, THREAD);
1102 if (anon_klass() != NULL)
1103 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
1104
1105 // try/finally clause:
1106 if (temp_alloc != NULL) {
1107 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal);
1108 }
1109
1110 // The anonymous class loader data has been artificially been kept alive to
1111 // this point. The mirror and any instances of this class have to keep
1112 // it alive afterwards.
1113 if (anon_klass() != NULL) {
1114 anon_klass->class_loader_data()->set_keep_alive(false);
1115 }
1116
1117 // let caller initialize it as needed...
1118
1119 return (jclass) res_jh;
1120 }
1121 UNSAFE_END
1122
1123
1124
1125 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1126 UnsafeWrapper("Unsafe_MonitorEnter");
1127 {
1128 if (jobj == NULL) {
1129 THROW(vmSymbols::java_lang_NullPointerException());
1130 }
1131 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1132 ObjectSynchronizer::jni_enter(obj, CHECK);
1133 }
1134 UNSAFE_END
1135
1136
1137 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1138 UnsafeWrapper("Unsafe_TryMonitorEnter");
1139 {
1140 if (jobj == NULL) {
1141 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1142 }
1143 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1144 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1145 return (res ? JNI_TRUE : JNI_FALSE);
1146 }
1147 UNSAFE_END
1148
1149
1150 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1151 UnsafeWrapper("Unsafe_MonitorExit");
1152 {
1153 if (jobj == NULL) {
1154 THROW(vmSymbols::java_lang_NullPointerException());
1155 }
1156 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1157 ObjectSynchronizer::jni_exit(obj(), CHECK);
1158 }
1159 UNSAFE_END
1160
1161
1162 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1163 UnsafeWrapper("Unsafe_ThrowException");
1164 {
1165 ThreadToNativeFromVM ttnfv(thread);
1166 env->Throw(thr);
1167 }
1168 UNSAFE_END
1169
1170 // JSR166 ------------------------------------------------------------------
1171
1172 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1173 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1174 oop x = JNIHandles::resolve(x_h);
1175 oop e = JNIHandles::resolve(e_h);
1176 oop p = JNIHandles::resolve(obj);
1177 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1178 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
1179 jboolean success = (res == e);
1180 if (success)
1181 update_barrier_set((void*)addr, x);
1182 return success;
1183 UNSAFE_END
1184
1185 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1186 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1187 oop p = JNIHandles::resolve(obj);
1188 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1189 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1190 UNSAFE_END
1191
1192 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1193 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1194 Handle p (THREAD, JNIHandles::resolve(obj));
1195 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1196 if (VM_Version::supports_cx8())
1197 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1198 else {
1199 jboolean success = false;
1200 ObjectLocker ol(p, THREAD);
1201 if (*addr == e) { *addr = x; success = true; }
1202 return success;
1203 }
1204 UNSAFE_END
1205
1206 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1207 UnsafeWrapper("Unsafe_Park");
1208 EventThreadPark event;
1209 #ifndef USDT2
1210 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1211 #else /* USDT2 */
1212 HOTSPOT_THREAD_PARK_BEGIN(
1213 (uintptr_t) thread->parker(), (int) isAbsolute, time);
1214 #endif /* USDT2 */
1215 JavaThreadParkedState jtps(thread, time != 0);
1216 thread->parker()->park(isAbsolute != 0, time);
1217 #ifndef USDT2
1218 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1219 #else /* USDT2 */
1220 HOTSPOT_THREAD_PARK_END(
1221 (uintptr_t) thread->parker());
1222 #endif /* USDT2 */
1223 if (event.should_commit()) {
1224 oop obj = thread->current_park_blocker();
1225 event.set_klass((obj != NULL) ? obj->klass() : NULL);
1226 event.set_timeout(time);
1227 event.set_address((obj != NULL) ? (TYPE_ADDRESS) cast_from_oop<uintptr_t>(obj) : 0);
1228 event.commit();
1229 }
1230 UNSAFE_END
1231
1232 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1233 UnsafeWrapper("Unsafe_Unpark");
1234 Parker* p = NULL;
1235 if (jthread != NULL) {
1236 oop java_thread = JNIHandles::resolve_non_null(jthread);
1237 if (java_thread != NULL) {
1238 jlong lp = java_lang_Thread::park_event(java_thread);
1239 if (lp != 0) {
1240 // This cast is OK even though the jlong might have been read
1241 // non-atomically on 32bit systems, since there, one word will
1242 // always be zero anyway and the value set is always the same
1243 p = (Parker*)addr_from_java(lp);
1244 } else {
1245 // Grab lock if apparently null or using older version of library
1246 MutexLocker mu(Threads_lock);
1247 java_thread = JNIHandles::resolve_non_null(jthread);
1248 if (java_thread != NULL) {
1249 JavaThread* thr = java_lang_Thread::thread(java_thread);
1250 if (thr != NULL) {
1251 p = thr->parker();
1252 if (p != NULL) { // Bind to Java thread for next time.
1253 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1254 }
1255 }
1256 }
1257 }
1258 }
1259 }
1260 if (p != NULL) {
1261 #ifndef USDT2
1262 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1263 #else /* USDT2 */
1264 HOTSPOT_THREAD_UNPARK(
1265 (uintptr_t) p);
1266 #endif /* USDT2 */
1267 p->unpark();
1268 }
1269 UNSAFE_END
1270
1271 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1272 UnsafeWrapper("Unsafe_Loadavg");
1273 const int max_nelem = 3;
1274 double la[max_nelem];
1275 jint ret;
1276
1277 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1278 assert(a->is_typeArray(), "must be type array");
1279
1280 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1281 ThreadToNativeFromVM ttnfv(thread);
1282 throw_new(env, "ArrayIndexOutOfBoundsException");
1283 return -1;
1284 }
1285
1286 ret = os::loadavg(la, nelem);
1287 if (ret == -1) return -1;
1288
1289 // if successful, ret is the number of samples actually retrieved.
1290 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1291 switch(ret) {
1292 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1293 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1294 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1295 }
1296 return ret;
1297 UNSAFE_END
1298
1299 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1300 UnsafeWrapper("Unsafe_PrefetchRead");
1301 oop p = JNIHandles::resolve(obj);
1302 void* addr = index_oop_from_field_offset_long(p, 0);
1303 Prefetch::read(addr, (intx)offset);
1304 UNSAFE_END
1305
1306 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1307 UnsafeWrapper("Unsafe_PrefetchWrite");
1308 oop p = JNIHandles::resolve(obj);
1309 void* addr = index_oop_from_field_offset_long(p, 0);
1310 Prefetch::write(addr, (intx)offset);
1311 UNSAFE_END
1312
1313
1314 /// JVM_RegisterUnsafeMethods
1315
1316 #define ADR "J"
1317
1318 #define LANG "Ljava/lang/"
1319
1320 #define OBJ LANG"Object;"
1321 #define CLS LANG"Class;"
1322 #define CTR LANG"reflect/Constructor;"
1323 #define FLD LANG"reflect/Field;"
1324 #define MTH LANG"reflect/Method;"
1325 #define THR LANG"Throwable;"
1326
1327 #define DC0_Args LANG"String;[BII"
1328 #define DC_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1329
1330 #define CC (char*) /*cast a literal from (const char*)*/
1331 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1332
1333 // define deprecated accessors for compabitility with 1.4.0
1334 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1335 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1336 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1337
1338 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1339 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1340 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1341 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1342
1343 // Note: In 1.5.0, there are volatile versions too
1344 #define DECLARE_GETSETOOP(Boolean, Z) \
1345 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1346 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1347 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1348 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1349
1350
1351 #define DECLARE_GETSETNATIVE(Byte, B) \
1352 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1353 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1354
1355
1356
1357 // These are the methods for 1.4.0
1358 static JNINativeMethod methods_140[] = {
1359 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)},
1360 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)},
1361
1362 DECLARE_GETSETOOP_140(Boolean, Z),
1363 DECLARE_GETSETOOP_140(Byte, B),
1364 DECLARE_GETSETOOP_140(Short, S),
1365 DECLARE_GETSETOOP_140(Char, C),
1366 DECLARE_GETSETOOP_140(Int, I),
1367 DECLARE_GETSETOOP_140(Long, J),
1368 DECLARE_GETSETOOP_140(Float, F),
1369 DECLARE_GETSETOOP_140(Double, D),
1370
1371 DECLARE_GETSETNATIVE(Byte, B),
1372 DECLARE_GETSETNATIVE(Short, S),
1373 DECLARE_GETSETNATIVE(Char, C),
1374 DECLARE_GETSETNATIVE(Int, I),
1375 DECLARE_GETSETNATIVE(Long, J),
1376 DECLARE_GETSETNATIVE(Float, F),
1377 DECLARE_GETSETNATIVE(Double, D),
1378
1379 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1380 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1381
1382 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1383 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1384 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1385
1386 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)},
1387 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)},
1388 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1389 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1390 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1391 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1392 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1393
1394 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1395 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1396 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1397 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1398 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1399 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1400 };
1401
1402 // These are the methods prior to the JSR 166 changes in 1.5.0
1403 static JNINativeMethod methods_141[] = {
1404 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1405 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1406
1407 DECLARE_GETSETOOP_141(Boolean, Z),
1408 DECLARE_GETSETOOP_141(Byte, B),
1409 DECLARE_GETSETOOP_141(Short, S),
1410 DECLARE_GETSETOOP_141(Char, C),
1411 DECLARE_GETSETOOP_141(Int, I),
1412 DECLARE_GETSETOOP_141(Long, J),
1413 DECLARE_GETSETOOP_141(Float, F),
1414 DECLARE_GETSETOOP_141(Double, D),
1415
1416 DECLARE_GETSETNATIVE(Byte, B),
1417 DECLARE_GETSETNATIVE(Short, S),
1418 DECLARE_GETSETNATIVE(Char, C),
1419 DECLARE_GETSETNATIVE(Int, I),
1420 DECLARE_GETSETNATIVE(Long, J),
1421 DECLARE_GETSETNATIVE(Float, F),
1422 DECLARE_GETSETNATIVE(Double, D),
1423
1424 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1425 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1426
1427 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1428 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1429 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1430
1431 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1432 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1433 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1434 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1435 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1436 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1437 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1438 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1439
1440 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1441 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1442 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1443 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1444 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1445 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1446
1447 };
1448
1449 // These are the methods prior to the JSR 166 changes in 1.6.0
1450 static JNINativeMethod methods_15[] = {
1451 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1452 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1453 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1454 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1455
1456
1457 DECLARE_GETSETOOP(Boolean, Z),
1458 DECLARE_GETSETOOP(Byte, B),
1459 DECLARE_GETSETOOP(Short, S),
1460 DECLARE_GETSETOOP(Char, C),
1461 DECLARE_GETSETOOP(Int, I),
1462 DECLARE_GETSETOOP(Long, J),
1463 DECLARE_GETSETOOP(Float, F),
1464 DECLARE_GETSETOOP(Double, D),
1465
1466 DECLARE_GETSETNATIVE(Byte, B),
1467 DECLARE_GETSETNATIVE(Short, S),
1468 DECLARE_GETSETNATIVE(Char, C),
1469 DECLARE_GETSETNATIVE(Int, I),
1470 DECLARE_GETSETNATIVE(Long, J),
1471 DECLARE_GETSETNATIVE(Float, F),
1472 DECLARE_GETSETNATIVE(Double, D),
1473
1474 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1475 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1476
1477 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1478 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1479 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1480
1481 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1482 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1483 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1484 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1485 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1486 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1487 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1488 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1489
1490 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1491 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1492 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1493 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1494 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1495 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1496 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1497 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1498 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1499 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1500 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1501
1502 };
1503
1504 // These are the methods for 1.6.0 and 1.7.0
1505 static JNINativeMethod methods_16[] = {
1506 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1507 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1508 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1509 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1510
1511 DECLARE_GETSETOOP(Boolean, Z),
1512 DECLARE_GETSETOOP(Byte, B),
1513 DECLARE_GETSETOOP(Short, S),
1514 DECLARE_GETSETOOP(Char, C),
1515 DECLARE_GETSETOOP(Int, I),
1516 DECLARE_GETSETOOP(Long, J),
1517 DECLARE_GETSETOOP(Float, F),
1518 DECLARE_GETSETOOP(Double, D),
1519
1520 DECLARE_GETSETNATIVE(Byte, B),
1521 DECLARE_GETSETNATIVE(Short, S),
1522 DECLARE_GETSETNATIVE(Char, C),
1523 DECLARE_GETSETNATIVE(Int, I),
1524 DECLARE_GETSETNATIVE(Long, J),
1525 DECLARE_GETSETNATIVE(Float, F),
1526 DECLARE_GETSETNATIVE(Double, D),
1527
1528 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1529 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1530
1531 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1532 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1533 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1534
1535 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1536 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1537 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1538 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1539 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1540 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1541 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1542 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1543
1544 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1545 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1546 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1547 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1548 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1549 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1550 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1551 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1552 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1553 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1554 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1555 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1556 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1557 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1558 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1559 };
1560
1561 // These are the methods for 1.8.0
1562 static JNINativeMethod methods_18[] = {
1563 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1564 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1565 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1566 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1567
1568 DECLARE_GETSETOOP(Boolean, Z),
1569 DECLARE_GETSETOOP(Byte, B),
1570 DECLARE_GETSETOOP(Short, S),
1571 DECLARE_GETSETOOP(Char, C),
1572 DECLARE_GETSETOOP(Int, I),
1573 DECLARE_GETSETOOP(Long, J),
1574 DECLARE_GETSETOOP(Float, F),
1575 DECLARE_GETSETOOP(Double, D),
1576
1577 DECLARE_GETSETNATIVE(Byte, B),
1578 DECLARE_GETSETNATIVE(Short, S),
1579 DECLARE_GETSETNATIVE(Char, C),
1580 DECLARE_GETSETNATIVE(Int, I),
1581 DECLARE_GETSETNATIVE(Long, J),
1582 DECLARE_GETSETNATIVE(Float, F),
1583 DECLARE_GETSETNATIVE(Double, D),
1584
1585 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1586 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1587
1588 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1589 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1590 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1591
1592 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1593 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1594 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1595 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1596 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1597 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1598 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1599 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1600
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 JNINativeMethod loadavg_method[] = {
1618 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1619 };
1620
1621 JNINativeMethod prefetch_methods[] = {
1622 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1623 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1624 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1625 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1626 };
1627
1628 JNINativeMethod memcopy_methods_17[] = {
1629 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1630 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1631 };
1632
1633 JNINativeMethod memcopy_methods_15[] = {
1634 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1635 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1636 };
1637
1638 JNINativeMethod anonk_methods[] = {
1639 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1640 };
1641
1642 JNINativeMethod lform_methods[] = {
1643 {CC"shouldBeInitialized",CC"("CLS")Z", FN_PTR(Unsafe_ShouldBeInitialized)},
1644 };
1645
1646 JNINativeMethod fence_methods[] = {
1647 {CC"loadFence", CC"()V", FN_PTR(Unsafe_LoadFence)},
1648 {CC"storeFence", CC"()V", FN_PTR(Unsafe_StoreFence)},
1649 {CC"fullFence", CC"()V", FN_PTR(Unsafe_FullFence)},
1650 };
1651
1652 #undef CC
1653 #undef FN_PTR
1654
1655 #undef ADR
1656 #undef LANG
1657 #undef OBJ
1658 #undef CLS
1659 #undef CTR
1660 #undef FLD
1661 #undef MTH
1662 #undef THR
1663 #undef DC0_Args
1664 #undef DC_Args
1665
1666 #undef DECLARE_GETSETOOP
1667 #undef DECLARE_GETSETNATIVE
1668
1669
1670 /**
1671 * Helper method to register native methods.
1672 */
1673 static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1674 int status = env->RegisterNatives(clazz, methods, nMethods);
1675 if (status < 0 || env->ExceptionOccurred()) {
1676 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1677 tty->print_cr("Unsafe: failed registering %s", message);
1678 }
1679 env->ExceptionClear();
1680 return false;
1681 } else {
1682 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1683 tty->print_cr("Unsafe: successfully registered %s", message);
1684 }
1685 return true;
1686 }
1687 }
1688
1689
1690 // This one function is exported, used by NativeLookup.
1691 // The Unsafe_xxx functions above are called only from the interpreter.
1692 // The optimizer looks at names and signatures to recognize
1693 // individual functions.
1694
1695 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1696 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1697 {
1698 ThreadToNativeFromVM ttnfv(thread);
1699
1700 // Unsafe methods
1701 {
1702 bool success = false;
1703 // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6
1704 if (!success) {
1705 success = register_natives("1.6 methods", env, unsafecls, methods_16, sizeof(methods_16)/sizeof(JNINativeMethod));
1706 }
1707 if (!success) {
1708 success = register_natives("1.8 methods", env, unsafecls, methods_18, sizeof(methods_18)/sizeof(JNINativeMethod));
1709 }
1710 if (!success) {
1711 success = register_natives("1.5 methods", env, unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1712 }
1713 if (!success) {
1714 success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1715 }
1716 if (!success) {
1717 success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1718 }
1719 guarantee(success, "register unsafe natives");
1720 }
1721
1722 // Unsafe.getLoadAverage
1723 register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1724
1725 // Prefetch methods
1726 register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1727
1728 // Memory copy methods
1729 {
1730 bool success = false;
1731 if (!success) {
1732 success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod));
1733 }
1734 if (!success) {
1735 success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1736 }
1737 }
1738
1739 // Unsafe.defineAnonymousClass
1740 if (EnableInvokeDynamic) {
1741 register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1742 }
1743
1744 // Unsafe.shouldBeInitialized
1745 if (EnableInvokeDynamic) {
1746 register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod));
1747 }
1748
1749 // Fence methods
1750 register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod));
1751 }
1752 JVM_END