1 /*
2 * Copyright (c) 2000, 2014, 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
52 #define MAX_OBJECT_SIZE \
53 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
54 + ((julong)max_jint * sizeof(double)) )
55
56
57 #define UNSAFE_ENTRY(result_type, header) \
58 JVM_ENTRY(result_type, header)
59
60 // Can't use UNSAFE_LEAF because it has the signature of a straight
61 // call into the runtime (just like JVM_LEAF, funny that) but it's
62 // called like a Java Native and thus the wrapper built for it passes
63 // arguments like a JNI call. It expects those arguments to be popped
64 // from the stack on Intel like all good JNI args are, and adjusts the
65 // stack according. Since the JVM_LEAF call expects no extra
66 // arguments the stack isn't popped in the C code, is pushed by the
67 // wrapper and we get sick.
68 //#define UNSAFE_LEAF(result_type, header) \
69 // JVM_LEAF(result_type, header)
70
71 #define UNSAFE_END JVM_END
72
73 #define UnsafeWrapper(arg) /*nothing, for the present*/
74
75
76 inline void* addr_from_java(jlong addr) {
77 // This assert fails in a variety of ways on 32-bit systems.
78 // It is impossible to predict whether native code that converts
79 // pointers to longs will sign-extend or zero-extend the addresses.
80 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
81 return (void*)(uintptr_t)addr;
82 }
83
84 inline jlong addr_to_java(void* p) {
85 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
86 return (uintptr_t)p;
87 }
88
89
90 // Note: The VM's obj_field and related accessors use byte-scaled
91 // ("unscaled") offsets, just as the unsafe methods do.
92
93 // However, the method Unsafe.fieldOffset explicitly declines to
94 // guarantee this. The field offset values manipulated by the Java user
95 // through the Unsafe API are opaque cookies that just happen to be byte
96 // offsets. We represent this state of affairs by passing the cookies
97 // through conversion functions when going between the VM and the Unsafe API.
98 // The conversion functions just happen to be no-ops at present.
99
100 inline jlong field_offset_to_byte_offset(jlong field_offset) {
101 return field_offset;
102 }
103
104 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
105 return byte_offset;
106 }
107
108 inline jint invocation_key_from_method_slot(jint slot) {
109 return slot;
110 }
111
112 inline jint invocation_key_to_method_slot(jint key) {
113 return key;
114 }
115
116 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
117 jlong byte_offset = field_offset_to_byte_offset(field_offset);
118 #ifdef ASSERT
119 if (p != NULL) {
120 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
121 if (byte_offset == (jint)byte_offset) {
122 void* ptr_plus_disp = (address)p + byte_offset;
123 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
124 "raw [ptr+disp] must be consistent with oop::field_base");
125 }
126 jlong p_size = HeapWordSize * (jlong)(p->size());
127 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size));
128 }
129 #endif
130 if (sizeof(char*) == sizeof(jint)) // (this constant folds!)
131 return (address)p + (jint) byte_offset;
132 else
133 return (address)p + byte_offset;
134 }
135
136 // Externally callable versions:
137 // (Use these in compiler intrinsics which emulate unsafe primitives.)
138 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
139 return field_offset;
140 }
141 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
142 return byte_offset;
143 }
144 jint Unsafe_invocation_key_from_method_slot(jint slot) {
145 return invocation_key_from_method_slot(slot);
146 }
147 jint Unsafe_invocation_key_to_method_slot(jint key) {
148 return invocation_key_to_method_slot(key);
149 }
150
151
152 ///// Data in the Java heap.
153
154 #define GET_FIELD(obj, offset, type_name, v) \
155 oop p = JNIHandles::resolve(obj); \
156 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
157
158 #define SET_FIELD(obj, offset, type_name, x) \
159 oop p = JNIHandles::resolve(obj); \
160 *(type_name*)index_oop_from_field_offset_long(p, offset) = x
161
162 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
163 oop p = JNIHandles::resolve(obj); \
164 if (support_IRIW_for_not_multiple_copy_atomic_cpu) { \
165 OrderAccess::fence(); \
166 } \
167 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
168
169 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
170 oop p = JNIHandles::resolve(obj); \
171 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x);
172
173 // Macros for oops that check UseCompressedOops
174
175 #define GET_OOP_FIELD(obj, offset, v) \
176 oop p = JNIHandles::resolve(obj); \
177 oop v; \
178 if (UseCompressedOops) { \
179 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
180 v = oopDesc::decode_heap_oop(n); \
181 } else { \
182 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
183 }
184
185
186 // Get/SetObject must be special-cased, since it works with handles.
187
188 // The xxx140 variants for backward compatibility do not allow a full-width offset.
189 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
190 UnsafeWrapper("Unsafe_GetObject");
191 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
192 GET_OOP_FIELD(obj, offset, v)
193 jobject ret = JNIHandles::make_local(env, v);
194 #if INCLUDE_ALL_GCS
195 // We could be accessing the referent field in a reference
196 // object. If G1 is enabled then we need to register a non-null
197 // referent with the SATB barrier.
198 if (UseG1GC) {
199 bool needs_barrier = false;
200
201 if (ret != NULL) {
202 if (offset == java_lang_ref_Reference::referent_offset) {
203 oop o = JNIHandles::resolve_non_null(obj);
204 Klass* k = o->klass();
205 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
206 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
207 needs_barrier = true;
208 }
209 }
210 }
211
212 if (needs_barrier) {
213 oop referent = JNIHandles::resolve(ret);
214 G1SATBCardTableModRefBS::enqueue(referent);
215 }
216 }
217 #endif // INCLUDE_ALL_GCS
218 return ret;
219 UNSAFE_END
220
221 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
222 UnsafeWrapper("Unsafe_SetObject");
223 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
224 oop x = JNIHandles::resolve(x_h);
225 //SET_FIELD(obj, offset, oop, x);
226 oop p = JNIHandles::resolve(obj);
227 if (UseCompressedOops) {
228 if (x != NULL) {
229 // If there is a heap base pointer, we are obliged to emit a store barrier.
230 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
231 } else {
232 narrowOop n = oopDesc::encode_heap_oop_not_null(x);
233 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
234 }
235 } else {
236 if (x != NULL) {
237 // If there is a heap base pointer, we are obliged to emit a store barrier.
238 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
239 } else {
240 *(oop*)index_oop_from_field_offset_long(p, offset) = x;
241 }
242 }
243 UNSAFE_END
244
245 // The normal variants allow a null base pointer with an arbitrary address.
246 // But if the base pointer is non-null, the offset should make some sense.
247 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
248 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
249 UnsafeWrapper("Unsafe_GetObject");
250 GET_OOP_FIELD(obj, offset, v)
251 jobject ret = JNIHandles::make_local(env, v);
252 #if INCLUDE_ALL_GCS
253 // We could be accessing the referent field in a reference
254 // object. If G1 is enabled then we need to register non-null
255 // referent with the SATB barrier.
256 if (UseG1GC) {
257 bool needs_barrier = false;
258
259 if (ret != NULL) {
260 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) {
261 oop o = JNIHandles::resolve(obj);
262 Klass* k = o->klass();
263 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
264 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
265 needs_barrier = true;
266 }
267 }
268 }
269
270 if (needs_barrier) {
271 oop referent = JNIHandles::resolve(ret);
272 G1SATBCardTableModRefBS::enqueue(referent);
273 }
274 }
275 #endif // INCLUDE_ALL_GCS
276 return ret;
277 UNSAFE_END
278
279 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
280 UnsafeWrapper("Unsafe_SetObject");
281 oop x = JNIHandles::resolve(x_h);
282 oop p = JNIHandles::resolve(obj);
283 if (UseCompressedOops) {
284 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
285 } else {
286 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
287 }
288 UNSAFE_END
289
290 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
291 UnsafeWrapper("Unsafe_GetObjectVolatile");
292 oop p = JNIHandles::resolve(obj);
293 void* addr = index_oop_from_field_offset_long(p, offset);
294 volatile oop v;
295 if (UseCompressedOops) {
296 volatile narrowOop n = *(volatile narrowOop*) addr;
297 (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n));
298 } else {
299 (void)const_cast<oop&>(v = *(volatile oop*) addr);
300 }
301 OrderAccess::acquire();
302 return JNIHandles::make_local(env, v);
303 UNSAFE_END
304
305 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
306 UnsafeWrapper("Unsafe_SetObjectVolatile");
307 oop x = JNIHandles::resolve(x_h);
308 oop p = JNIHandles::resolve(obj);
309 void* addr = index_oop_from_field_offset_long(p, offset);
310 OrderAccess::release();
311 if (UseCompressedOops) {
312 oop_store((narrowOop*)addr, x);
313 } else {
314 oop_store((oop*)addr, x);
315 }
316 OrderAccess::fence();
317 UNSAFE_END
318
319 #ifndef SUPPORTS_NATIVE_CX8
320 // Keep old code for platforms which may not have atomic jlong (8 bytes) instructions
321
322 // Volatile long versions must use locks if !VM_Version::supports_cx8().
323 // support_cx8 is a surrogate for 'supports atomic long memory ops'.
324
325 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
326 UnsafeWrapper("Unsafe_GetLongVolatile");
327 {
328 if (VM_Version::supports_cx8()) {
329 GET_FIELD_VOLATILE(obj, offset, jlong, v);
330 return v;
331 }
332 else {
333 Handle p (THREAD, JNIHandles::resolve(obj));
334 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
335 ObjectLocker ol(p, THREAD);
336 jlong value = *addr;
337 return value;
338 }
339 }
340 UNSAFE_END
341
342 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
343 UnsafeWrapper("Unsafe_SetLongVolatile");
344 {
345 if (VM_Version::supports_cx8()) {
346 SET_FIELD_VOLATILE(obj, offset, jlong, x);
347 }
348 else {
349 Handle p (THREAD, JNIHandles::resolve(obj));
350 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
351 ObjectLocker ol(p, THREAD);
352 *addr = x;
353 }
354 }
355 UNSAFE_END
356
357 #endif // not SUPPORTS_NATIVE_CX8
358
359 #define DEFINE_GETSETOOP(jboolean, Boolean) \
360 \
361 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
362 UnsafeWrapper("Unsafe_Get"#Boolean); \
363 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
364 GET_FIELD(obj, offset, jboolean, v); \
365 return v; \
366 UNSAFE_END \
367 \
368 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
369 UnsafeWrapper("Unsafe_Set"#Boolean); \
370 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
371 SET_FIELD(obj, offset, jboolean, x); \
372 UNSAFE_END \
373 \
374 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
375 UnsafeWrapper("Unsafe_Get"#Boolean); \
376 GET_FIELD(obj, offset, jboolean, v); \
377 return v; \
378 UNSAFE_END \
379 \
380 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
381 UnsafeWrapper("Unsafe_Set"#Boolean); \
382 SET_FIELD(obj, offset, jboolean, x); \
383 UNSAFE_END \
384 \
385 // END DEFINE_GETSETOOP.
386
387 DEFINE_GETSETOOP(jboolean, Boolean)
388 DEFINE_GETSETOOP(jbyte, Byte)
389 DEFINE_GETSETOOP(jshort, Short);
390 DEFINE_GETSETOOP(jchar, Char);
391 DEFINE_GETSETOOP(jint, Int);
392 DEFINE_GETSETOOP(jlong, Long);
393 DEFINE_GETSETOOP(jfloat, Float);
394 DEFINE_GETSETOOP(jdouble, Double);
395
396 #undef DEFINE_GETSETOOP
397
398 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
399 \
400 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
401 UnsafeWrapper("Unsafe_Get"#Boolean); \
402 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
403 return v; \
404 UNSAFE_END \
405 \
406 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
407 UnsafeWrapper("Unsafe_Set"#Boolean); \
408 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
409 UNSAFE_END \
410 \
411 // END DEFINE_GETSETOOP_VOLATILE.
412
413 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
414 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
415 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
416 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
417 DEFINE_GETSETOOP_VOLATILE(jint, Int);
418 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
419 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
420
421 #ifdef SUPPORTS_NATIVE_CX8
422 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
423 #endif
424
425 #undef DEFINE_GETSETOOP_VOLATILE
426
427 // The non-intrinsified versions of setOrdered just use setVolatile
428
429 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
430 UnsafeWrapper("Unsafe_SetOrderedInt");
431 SET_FIELD_VOLATILE(obj, offset, jint, x);
432 UNSAFE_END
433
434 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
435 UnsafeWrapper("Unsafe_SetOrderedObject");
436 oop x = JNIHandles::resolve(x_h);
437 oop p = JNIHandles::resolve(obj);
438 void* addr = index_oop_from_field_offset_long(p, offset);
439 OrderAccess::release();
440 if (UseCompressedOops) {
441 oop_store((narrowOop*)addr, x);
442 } else {
443 oop_store((oop*)addr, x);
444 }
445 OrderAccess::fence();
446 UNSAFE_END
447
448 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
449 UnsafeWrapper("Unsafe_SetOrderedLong");
450 #ifdef SUPPORTS_NATIVE_CX8
451 SET_FIELD_VOLATILE(obj, offset, jlong, x);
452 #else
453 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
454 {
455 if (VM_Version::supports_cx8()) {
456 SET_FIELD_VOLATILE(obj, offset, jlong, x);
457 }
458 else {
459 Handle p (THREAD, JNIHandles::resolve(obj));
460 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
461 ObjectLocker ol(p, THREAD);
462 *addr = x;
463 }
464 }
465 #endif
466 UNSAFE_END
467
468 UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe))
469 UnsafeWrapper("Unsafe_LoadFence");
470 OrderAccess::acquire();
471 UNSAFE_END
472
473 UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe))
474 UnsafeWrapper("Unsafe_StoreFence");
475 OrderAccess::release();
476 UNSAFE_END
477
478 UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe))
479 UnsafeWrapper("Unsafe_FullFence");
480 OrderAccess::fence();
481 UNSAFE_END
482
483 ////// Data in the C heap.
484
485 // Note: These do not throw NullPointerException for bad pointers.
486 // They just crash. Only a oop base pointer can generate a NullPointerException.
487 //
488 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
489 \
490 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
491 UnsafeWrapper("Unsafe_GetNative"#Type); \
492 void* p = addr_from_java(addr); \
493 JavaThread* t = JavaThread::current(); \
494 t->set_doing_unsafe_access(true); \
495 java_type x = *(volatile native_type*)p; \
496 t->set_doing_unsafe_access(false); \
497 return x; \
498 UNSAFE_END \
499 \
500 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
501 UnsafeWrapper("Unsafe_SetNative"#Type); \
502 JavaThread* t = JavaThread::current(); \
503 t->set_doing_unsafe_access(true); \
504 void* p = addr_from_java(addr); \
505 *(volatile native_type*)p = x; \
506 t->set_doing_unsafe_access(false); \
507 UNSAFE_END \
508 \
509 // END DEFINE_GETSETNATIVE.
510
511 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
512 DEFINE_GETSETNATIVE(jshort, Short, signed short);
513 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
514 DEFINE_GETSETNATIVE(jint, Int, jint);
515 // no long -- handled specially
516 DEFINE_GETSETNATIVE(jfloat, Float, float);
517 DEFINE_GETSETNATIVE(jdouble, Double, double);
518
519 #undef DEFINE_GETSETNATIVE
520
521 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
522 UnsafeWrapper("Unsafe_GetNativeLong");
523 JavaThread* t = JavaThread::current();
524 // We do it this way to avoid problems with access to heap using 64
525 // bit loads, as jlong in heap could be not 64-bit aligned, and on
526 // some CPUs (SPARC) it leads to SIGBUS.
527 t->set_doing_unsafe_access(true);
528 void* p = addr_from_java(addr);
529 jlong x;
530 if (((intptr_t)p & 7) == 0) {
531 // jlong is aligned, do a volatile access
532 x = *(volatile jlong*)p;
533 } else {
534 jlong_accessor acc;
535 acc.words[0] = ((volatile jint*)p)[0];
536 acc.words[1] = ((volatile jint*)p)[1];
537 x = acc.long_value;
538 }
539 t->set_doing_unsafe_access(false);
540 return x;
541 UNSAFE_END
542
543 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
544 UnsafeWrapper("Unsafe_SetNativeLong");
545 JavaThread* t = JavaThread::current();
546 // see comment for Unsafe_GetNativeLong
547 t->set_doing_unsafe_access(true);
548 void* p = addr_from_java(addr);
549 if (((intptr_t)p & 7) == 0) {
550 // jlong is aligned, do a volatile access
551 *(volatile jlong*)p = x;
552 } else {
553 jlong_accessor acc;
554 acc.long_value = x;
555 ((volatile jint*)p)[0] = acc.words[0];
556 ((volatile jint*)p)[1] = acc.words[1];
557 }
558 t->set_doing_unsafe_access(false);
559 UNSAFE_END
560
561
562 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
563 UnsafeWrapper("Unsafe_GetNativeAddress");
564 void* p = addr_from_java(addr);
565 return addr_to_java(*(void**)p);
566 UNSAFE_END
567
568 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
569 UnsafeWrapper("Unsafe_SetNativeAddress");
570 void* p = addr_from_java(addr);
571 *(void**)p = addr_from_java(x);
572 UNSAFE_END
573
574
575 ////// Allocation requests
576
577 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
578 UnsafeWrapper("Unsafe_AllocateInstance");
579 {
580 ThreadToNativeFromVM ttnfv(thread);
581 return env->AllocObject(cls);
582 }
583 UNSAFE_END
584
585 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
586 UnsafeWrapper("Unsafe_AllocateMemory");
587 size_t sz = (size_t)size;
588 if (sz != (julong)size || size < 0) {
589 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
590 }
591 if (sz == 0) {
592 return 0;
593 }
594 sz = round_to(sz, HeapWordSize);
595 void* x = os::malloc(sz, mtInternal);
596 if (x == NULL) {
597 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
598 }
599 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
600 return addr_to_java(x);
601 UNSAFE_END
602
603 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
604 UnsafeWrapper("Unsafe_ReallocateMemory");
605 void* p = addr_from_java(addr);
606 size_t sz = (size_t)size;
607 if (sz != (julong)size || size < 0) {
608 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
609 }
610 if (sz == 0) {
611 os::free(p);
612 return 0;
613 }
614 sz = round_to(sz, HeapWordSize);
615 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal);
616 if (x == NULL) {
617 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
618 }
619 return addr_to_java(x);
620 UNSAFE_END
621
622 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
623 UnsafeWrapper("Unsafe_FreeMemory");
624 void* p = addr_from_java(addr);
625 if (p == NULL) {
626 return;
627 }
628 os::free(p);
629 UNSAFE_END
630
631 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
632 UnsafeWrapper("Unsafe_SetMemory");
633 size_t sz = (size_t)size;
634 if (sz != (julong)size || size < 0) {
635 THROW(vmSymbols::java_lang_IllegalArgumentException());
636 }
637 char* p = (char*) addr_from_java(addr);
638 Copy::fill_to_memory_atomic(p, sz, value);
639 UNSAFE_END
640
641 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
642 UnsafeWrapper("Unsafe_SetMemory");
643 size_t sz = (size_t)size;
644 if (sz != (julong)size || size < 0) {
645 THROW(vmSymbols::java_lang_IllegalArgumentException());
646 }
647 oop base = JNIHandles::resolve(obj);
648 void* p = index_oop_from_field_offset_long(base, offset);
649 Copy::fill_to_memory_atomic(p, sz, value);
650 UNSAFE_END
651
652 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
653 UnsafeWrapper("Unsafe_CopyMemory");
654 if (size == 0) {
655 return;
656 }
657 size_t sz = (size_t)size;
658 if (sz != (julong)size || size < 0) {
659 THROW(vmSymbols::java_lang_IllegalArgumentException());
660 }
661 void* src = addr_from_java(srcAddr);
662 void* dst = addr_from_java(dstAddr);
663 Copy::conjoint_memory_atomic(src, dst, sz);
664 UNSAFE_END
665
666 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
667 UnsafeWrapper("Unsafe_CopyMemory");
668 if (size == 0) {
669 return;
670 }
671 size_t sz = (size_t)size;
672 if (sz != (julong)size || size < 0) {
673 THROW(vmSymbols::java_lang_IllegalArgumentException());
674 }
675 oop srcp = JNIHandles::resolve(srcObj);
676 oop dstp = JNIHandles::resolve(dstObj);
677 if (dstp != NULL && !dstp->is_typeArray()) {
678 // NYI: This works only for non-oop arrays at present.
679 // Generalizing it would be reasonable, but requires card marking.
680 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
681 THROW(vmSymbols::java_lang_IllegalArgumentException());
682 }
683 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
684 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
685 Copy::conjoint_memory_atomic(src, dst, sz);
686 UNSAFE_END
687
688
689 ////// Random queries
690
691 // See comment at file start about UNSAFE_LEAF
692 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
693 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
694 UnsafeWrapper("Unsafe_AddressSize");
695 return sizeof(void*);
696 UNSAFE_END
697
698 // See comment at file start about UNSAFE_LEAF
699 //UNSAFE_LEAF(jint, Unsafe_PageSize())
700 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
701 UnsafeWrapper("Unsafe_PageSize");
702 return os::vm_page_size();
703 UNSAFE_END
704
705 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
706 if (field == NULL) {
707 THROW_0(vmSymbols::java_lang_NullPointerException());
708 }
709
710 oop reflected = JNIHandles::resolve_non_null(field);
711 oop mirror = java_lang_reflect_Field::clazz(reflected);
712 Klass* k = java_lang_Class::as_Klass(mirror);
713 int slot = java_lang_reflect_Field::slot(reflected);
714 int modifiers = java_lang_reflect_Field::modifiers(reflected);
715
716 if (must_be_static >= 0) {
717 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
718 if (must_be_static != really_is_static) {
719 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
720 }
721 }
722
723 int offset = InstanceKlass::cast(k)->field_offset(slot);
724 return field_offset_from_byte_offset(offset);
725 }
726
727 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
728 UnsafeWrapper("Unsafe_ObjectFieldOffset");
729 return find_field_offset(field, 0, THREAD);
730 UNSAFE_END
731
732 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
733 UnsafeWrapper("Unsafe_StaticFieldOffset");
734 return find_field_offset(field, 1, THREAD);
735 UNSAFE_END
736
737 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
738 UnsafeWrapper("Unsafe_StaticFieldBase");
739 // Note: In this VM implementation, a field address is always a short
740 // offset from the base of a a klass metaobject. Thus, the full dynamic
741 // range of the return type is never used. However, some implementations
742 // might put the static field inside an array shared by many classes,
743 // or even at a fixed address, in which case the address could be quite
744 // large. In that last case, this function would return NULL, since
745 // the address would operate alone, without any base pointer.
746
747 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
748
749 oop reflected = JNIHandles::resolve_non_null(field);
750 oop mirror = java_lang_reflect_Field::clazz(reflected);
751 int modifiers = java_lang_reflect_Field::modifiers(reflected);
752
753 if ((modifiers & JVM_ACC_STATIC) == 0) {
754 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
755 }
756
757 return JNIHandles::make_local(env, mirror);
758 UNSAFE_END
759
760 //@deprecated
761 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
762 UnsafeWrapper("Unsafe_FieldOffset");
763 // tries (but fails) to be polymorphic between static and non-static:
764 jlong offset = find_field_offset(field, -1, THREAD);
765 guarantee(offset == (jint)offset, "offset fits in 32 bits");
766 return (jint)offset;
767 UNSAFE_END
768
769 //@deprecated
770 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
771 UnsafeWrapper("Unsafe_StaticFieldBase");
772 if (clazz == NULL) {
773 THROW_0(vmSymbols::java_lang_NullPointerException());
774 }
775 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
776 UNSAFE_END
777
778 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
779 UnsafeWrapper("Unsafe_EnsureClassInitialized");
780 if (clazz == NULL) {
781 THROW(vmSymbols::java_lang_NullPointerException());
782 }
783 oop mirror = JNIHandles::resolve_non_null(clazz);
784
785 Klass* klass = java_lang_Class::as_Klass(mirror);
786 if (klass != NULL && klass->should_be_initialized()) {
787 InstanceKlass* k = InstanceKlass::cast(klass);
788 k->initialize(CHECK);
789 }
790 }
791 UNSAFE_END
792
793 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
794 UnsafeWrapper("Unsafe_ShouldBeInitialized");
795 if (clazz == NULL) {
796 THROW_(vmSymbols::java_lang_NullPointerException(), false);
797 }
798 oop mirror = JNIHandles::resolve_non_null(clazz);
799 Klass* klass = java_lang_Class::as_Klass(mirror);
800 if (klass != NULL && klass->should_be_initialized()) {
801 return true;
802 }
803 return false;
804 }
805 UNSAFE_END
806
807 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
808 if (acls == NULL) {
809 THROW(vmSymbols::java_lang_NullPointerException());
810 }
811 oop mirror = JNIHandles::resolve_non_null(acls);
812 Klass* k = java_lang_Class::as_Klass(mirror);
813 if (k == NULL || !k->oop_is_array()) {
814 THROW(vmSymbols::java_lang_InvalidClassException());
815 } else if (k->oop_is_objArray()) {
816 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
817 scale = heapOopSize;
818 } else if (k->oop_is_typeArray()) {
819 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
820 base = tak->array_header_in_bytes();
821 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
822 scale = (1 << tak->log2_element_size());
823 } else {
824 ShouldNotReachHere();
825 }
826 }
827
828 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
829 UnsafeWrapper("Unsafe_ArrayBaseOffset");
830 int base, scale;
831 getBaseAndScale(base, scale, acls, CHECK_0);
832 return field_offset_from_byte_offset(base);
833 UNSAFE_END
834
835
836 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
837 UnsafeWrapper("Unsafe_ArrayIndexScale");
838 int base, scale;
839 getBaseAndScale(base, scale, acls, CHECK_0);
840 // This VM packs both fields and array elements down to the byte.
841 // But watch out: If this changes, so that array references for
842 // a given primitive type (say, T_BOOLEAN) use different memory units
843 // than fields, this method MUST return zero for such arrays.
844 // For example, the VM used to store sub-word sized fields in full
845 // words in the object layout, so that accessors like getByte(Object,int)
846 // did not really do what one might expect for arrays. Therefore,
847 // this function used to report a zero scale factor, so that the user
848 // would know not to attempt to access sub-word array elements.
849 // // Code for unpacked fields:
850 // if (scale < wordSize) return 0;
851
852 // The following allows for a pretty general fieldOffset cookie scheme,
853 // but requires it to be linear in byte offset.
854 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
855 UNSAFE_END
856
857
858 static inline void throw_new(JNIEnv *env, const char *ename) {
859 char buf[100];
860 strcpy(buf, "java/lang/");
861 strcat(buf, ename);
862 jclass cls = env->FindClass(buf);
863 if (env->ExceptionCheck()) {
864 env->ExceptionClear();
865 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf);
866 return;
867 }
868 char* msg = NULL;
869 env->ThrowNew(cls, msg);
870 }
871
872 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
873 {
874 // Code lifted from JDK 1.3 ClassLoader.c
875
876 jbyte *body;
877 char *utfName;
878 jclass result = 0;
879 char buf[128];
880
881 if (UsePerfData) {
882 ClassLoader::unsafe_defineClassCallCounter()->inc();
883 }
884
885 if (data == NULL) {
886 throw_new(env, "NullPointerException");
887 return 0;
888 }
889
890 /* Work around 4153825. malloc crashes on Solaris when passed a
891 * negative size.
892 */
893 if (length < 0) {
894 throw_new(env, "ArrayIndexOutOfBoundsException");
895 return 0;
896 }
897
898 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
899
900 if (body == 0) {
901 throw_new(env, "OutOfMemoryError");
902 return 0;
903 }
904
905 env->GetByteArrayRegion(data, offset, length, body);
906
907 if (env->ExceptionOccurred())
908 goto free_body;
909
910 if (name != NULL) {
911 uint len = env->GetStringUTFLength(name);
912 int unicode_len = env->GetStringLength(name);
913 if (len >= sizeof(buf)) {
914 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
915 if (utfName == NULL) {
916 throw_new(env, "OutOfMemoryError");
917 goto free_body;
918 }
919 } else {
920 utfName = buf;
921 }
922 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
923 //VerifyFixClassname(utfName);
924 for (uint i = 0; i < len; i++) {
925 if (utfName[i] == '.') utfName[i] = '/';
926 }
927 } else {
928 utfName = NULL;
929 }
930
931 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
932
933 if (utfName && utfName != buf)
934 FREE_C_HEAP_ARRAY(char, utfName, mtInternal);
935
936 free_body:
937 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal);
938 return result;
939 }
940 }
941
942
943 UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
944 UnsafeWrapper("Unsafe_DefineClass");
945 {
946 ThreadToNativeFromVM ttnfv(thread);
947 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
948 }
949 UNSAFE_END
950
951
952 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
953 UnsafeWrapper("Unsafe_DefineClass");
954 {
955 ThreadToNativeFromVM ttnfv(thread);
956
957 int depthFromDefineClass0 = 1;
958 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
959 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
960 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
961
962 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
963 }
964 UNSAFE_END
965
966
967 #define DAC_Args CLS"[B["OBJ
968 // define a class but do not make it known to the class loader or system dictionary
969 // - host_class: supplies context for linkage, access control, protection domain, and class loader
970 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
971 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
972
973 // When you load an anonymous class U, it works as if you changed its name just before loading,
974 // to a name that you will never use again. Since the name is lost, no other class can directly
975 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
976 // through java.lang.Class methods like Class.newInstance.
977
978 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
979 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
980 // An anonymous class also has special privileges to access any member of its host class.
981 // This is the main reason why this loading operation is unsafe. The purpose of this is to
982 // allow language implementations to simulate "open classes"; a host class in effect gets
983 // new code when an anonymous class is loaded alongside it. A less convenient but more
984 // standard way to do this is with reflection, which can also be set to ignore access
985 // restrictions.
986
987 // Access into an anonymous class is possible only through reflection. Therefore, there
988 // are no special access rules for calling into an anonymous class. The relaxed access
989 // rule for the host class is applied in the opposite direction: A host class reflectively
990 // access one of its anonymous classes.
991
992 // If you load the same bytecodes twice, you get two different classes. You can reload
993 // the same bytecodes with or without varying CP patches.
994
995 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
996 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
997 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
998
999 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
1000 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
1001 // It is not possible for a named class, or an older anonymous class, to refer by
1002 // name (via its CP) to a newer anonymous class.
1003
1004 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
1005 // or type descriptors used in the loaded anonymous class.
1006
1007 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
1008 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
1009 // be changed to println(greeting), where greeting is an arbitrary object created before
1010 // the anonymous class is loaded. This is useful in dynamic languages, in which
1011 // various kinds of metaobjects must be introduced as constants into bytecode.
1012 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
1013 // not just a literal string. For such ldc instructions, the verifier uses the
1014 // type Object instead of String, if the loaded constant is not in fact a String.
1015
1016 static instanceKlassHandle
1017 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
1018 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
1019 HeapWord* *temp_alloc,
1020 TRAPS) {
1021
1022 if (UsePerfData) {
1023 ClassLoader::unsafe_defineClassCallCounter()->inc();
1024 }
1025
1026 if (data == NULL) {
1027 THROW_0(vmSymbols::java_lang_NullPointerException());
1028 }
1029
1030 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
1031 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
1032 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal);
1033 if (body == NULL) {
1034 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1035 }
1036
1037 // caller responsible to free it:
1038 (*temp_alloc) = body;
1039
1040 {
1041 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1042 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1043 }
1044
1045 u1* class_bytes = (u1*) body;
1046 int class_bytes_length = (int) length;
1047 if (class_bytes_length < 0) class_bytes_length = 0;
1048 if (class_bytes == NULL
1049 || host_class == NULL
1050 || length != class_bytes_length)
1051 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1052
1053 objArrayHandle cp_patches_h;
1054 if (cp_patches_jh != NULL) {
1055 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1056 if (!p->is_objArray())
1057 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1058 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1059 }
1060
1061 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class)));
1062 const char* host_source = host_klass->external_name();
1063 Handle host_loader(THREAD, host_klass->class_loader());
1064 Handle host_domain(THREAD, host_klass->protection_domain());
1065
1066 GrowableArray<Handle>* cp_patches = NULL;
1067 if (cp_patches_h.not_null()) {
1068 int alen = cp_patches_h->length();
1069 for (int i = alen-1; i >= 0; i--) {
1070 oop p = cp_patches_h->obj_at(i);
1071 if (p != NULL) {
1072 Handle patch(THREAD, p);
1073 if (cp_patches == NULL)
1074 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1075 cp_patches->at_put(i, patch);
1076 }
1077 }
1078 }
1079
1080 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1081
1082 instanceKlassHandle anon_klass;
1083 {
1084 Symbol* no_class_name = NULL;
1085 Klass* anonk = SystemDictionary::parse_stream(no_class_name,
1086 host_loader, host_domain,
1087 &st, host_klass, cp_patches,
1088 CHECK_NULL);
1089 if (anonk == NULL) return NULL;
1090 anon_klass = instanceKlassHandle(THREAD, anonk);
1091 }
1092
1093 return anon_klass;
1094 }
1095
1096 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1097 {
1098 instanceKlassHandle anon_klass;
1099 jobject res_jh = NULL;
1100
1101 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1102 ResourceMark rm(THREAD);
1103
1104 HeapWord* temp_alloc = NULL;
1105
1106 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data,
1107 cp_patches_jh,
1108 &temp_alloc, THREAD);
1109 if (anon_klass() != NULL)
1110 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
1111
1112 // try/finally clause:
1113 if (temp_alloc != NULL) {
1114 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal);
1115 }
1116
1117 // The anonymous class loader data has been artificially been kept alive to
1118 // this point. The mirror and any instances of this class have to keep
1119 // it alive afterwards.
1120 if (anon_klass() != NULL) {
1121 anon_klass->class_loader_data()->set_keep_alive(false);
1122 }
1123
1124 // let caller initialize it as needed...
1125
1126 return (jclass) res_jh;
1127 }
1128 UNSAFE_END
1129
1130
1131
1132 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1133 UnsafeWrapper("Unsafe_MonitorEnter");
1134 {
1135 if (jobj == NULL) {
1136 THROW(vmSymbols::java_lang_NullPointerException());
1137 }
1138 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1139 ObjectSynchronizer::jni_enter(obj, CHECK);
1140 }
1141 UNSAFE_END
1142
1143
1144 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1145 UnsafeWrapper("Unsafe_TryMonitorEnter");
1146 {
1147 if (jobj == NULL) {
1148 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1149 }
1150 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1151 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1152 return (res ? JNI_TRUE : JNI_FALSE);
1153 }
1154 UNSAFE_END
1155
1156
1157 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1158 UnsafeWrapper("Unsafe_MonitorExit");
1159 {
1160 if (jobj == NULL) {
1161 THROW(vmSymbols::java_lang_NullPointerException());
1162 }
1163 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1164 ObjectSynchronizer::jni_exit(obj(), CHECK);
1165 }
1166 UNSAFE_END
1167
1168
1169 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1170 UnsafeWrapper("Unsafe_ThrowException");
1171 {
1172 ThreadToNativeFromVM ttnfv(thread);
1173 env->Throw(thr);
1174 }
1175 UNSAFE_END
1176
1177 // JSR166 ------------------------------------------------------------------
1178
1179 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1180 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1181 oop x = JNIHandles::resolve(x_h);
1182 oop e = JNIHandles::resolve(e_h);
1183 oop p = JNIHandles::resolve(obj);
1184 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1185 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
1186 jboolean success = (res == e);
1187 if (success)
1188 update_barrier_set((void*)addr, x);
1189 return success;
1190 UNSAFE_END
1191
1192 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1193 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1194 oop p = JNIHandles::resolve(obj);
1195 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1196 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1197 UNSAFE_END
1198
1199 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1200 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1201 Handle p (THREAD, JNIHandles::resolve(obj));
1202 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1203 if (VM_Version::supports_cx8())
1204 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1205 else {
1206 jboolean success = false;
1207 ObjectLocker ol(p, THREAD);
1208 if (*addr == e) { *addr = x; success = true; }
1209 return success;
1210 }
1211 UNSAFE_END
1212
1213 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1214 UnsafeWrapper("Unsafe_Park");
1215 EventThreadPark event;
1216 HOTSPOT_THREAD_PARK_BEGIN((uintptr_t) thread->parker(), (int) isAbsolute, time);
1217
1218 JavaThreadParkedState jtps(thread, time != 0);
1219 thread->parker()->park(isAbsolute != 0, time);
1220
1221 HOTSPOT_THREAD_PARK_END((uintptr_t) thread->parker());
1222 if (event.should_commit()) {
1223 oop obj = thread->current_park_blocker();
1224 event.set_klass((obj != NULL) ? obj->klass() : NULL);
1225 event.set_timeout(time);
1226 event.set_address((obj != NULL) ? (TYPE_ADDRESS) cast_from_oop<uintptr_t>(obj) : 0);
1227 event.commit();
1228 }
1229 UNSAFE_END
1230
1231 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1232 UnsafeWrapper("Unsafe_Unpark");
1233 Parker* p = NULL;
1234 if (jthread != NULL) {
1235 oop java_thread = JNIHandles::resolve_non_null(jthread);
1236 if (java_thread != NULL) {
1237 jlong lp = java_lang_Thread::park_event(java_thread);
1238 if (lp != 0) {
1239 // This cast is OK even though the jlong might have been read
1240 // non-atomically on 32bit systems, since there, one word will
1241 // always be zero anyway and the value set is always the same
1242 p = (Parker*)addr_from_java(lp);
1243 } else {
1244 // Grab lock if apparently null or using older version of library
1245 MutexLocker mu(Threads_lock);
1246 java_thread = JNIHandles::resolve_non_null(jthread);
1247 if (java_thread != NULL) {
1248 JavaThread* thr = java_lang_Thread::thread(java_thread);
1249 if (thr != NULL) {
1250 p = thr->parker();
1251 if (p != NULL) { // Bind to Java thread for next time.
1252 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1253 }
1254 }
1255 }
1256 }
1257 }
1258 }
1259 if (p != NULL) {
1260 HOTSPOT_THREAD_UNPARK((uintptr_t) p);
1261 p->unpark();
1262 }
1263 UNSAFE_END
1264
1265 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1266 UnsafeWrapper("Unsafe_Loadavg");
1267 const int max_nelem = 3;
1268 double la[max_nelem];
1269 jint ret;
1270
1271 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1272 assert(a->is_typeArray(), "must be type array");
1273
1274 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1275 ThreadToNativeFromVM ttnfv(thread);
1276 throw_new(env, "ArrayIndexOutOfBoundsException");
1277 return -1;
1278 }
1279
1280 ret = os::loadavg(la, nelem);
1281 if (ret == -1) return -1;
1282
1283 // if successful, ret is the number of samples actually retrieved.
1284 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1285 switch(ret) {
1286 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1287 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1288 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1289 }
1290 return ret;
1291 UNSAFE_END
1292
1293 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1294 UnsafeWrapper("Unsafe_PrefetchRead");
1295 oop p = JNIHandles::resolve(obj);
1296 void* addr = index_oop_from_field_offset_long(p, 0);
1297 Prefetch::read(addr, (intx)offset);
1298 UNSAFE_END
1299
1300 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1301 UnsafeWrapper("Unsafe_PrefetchWrite");
1302 oop p = JNIHandles::resolve(obj);
1303 void* addr = index_oop_from_field_offset_long(p, 0);
1304 Prefetch::write(addr, (intx)offset);
1305 UNSAFE_END
1306
1307
1308 /// JVM_RegisterUnsafeMethods
1309
1310 #define ADR "J"
1311
1312 #define LANG "Ljava/lang/"
1313
1314 #define OBJ LANG"Object;"
1315 #define CLS LANG"Class;"
1316 #define CTR LANG"reflect/Constructor;"
1317 #define FLD LANG"reflect/Field;"
1318 #define MTH LANG"reflect/Method;"
1319 #define THR LANG"Throwable;"
1320
1321 #define DC0_Args LANG"String;[BII"
1322 #define DC_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1323
1324 #define CC (char*) /*cast a literal from (const char*)*/
1325 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1326
1327 // define deprecated accessors for compabitility with 1.4.0
1328 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1329 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1330 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1331
1332 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1333 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1334 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1335 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1336
1337 // Note: In 1.5.0, there are volatile versions too
1338 #define DECLARE_GETSETOOP(Boolean, Z) \
1339 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1340 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1341 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1342 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1343
1344
1345 #define DECLARE_GETSETNATIVE(Byte, B) \
1346 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1347 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1348
1349
1350
1351 // These are the methods for 1.4.0
1352 static JNINativeMethod methods_140[] = {
1353 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)},
1354 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)},
1355
1356 DECLARE_GETSETOOP_140(Boolean, Z),
1357 DECLARE_GETSETOOP_140(Byte, B),
1358 DECLARE_GETSETOOP_140(Short, S),
1359 DECLARE_GETSETOOP_140(Char, C),
1360 DECLARE_GETSETOOP_140(Int, I),
1361 DECLARE_GETSETOOP_140(Long, J),
1362 DECLARE_GETSETOOP_140(Float, F),
1363 DECLARE_GETSETOOP_140(Double, D),
1364
1365 DECLARE_GETSETNATIVE(Byte, B),
1366 DECLARE_GETSETNATIVE(Short, S),
1367 DECLARE_GETSETNATIVE(Char, C),
1368 DECLARE_GETSETNATIVE(Int, I),
1369 DECLARE_GETSETNATIVE(Long, J),
1370 DECLARE_GETSETNATIVE(Float, F),
1371 DECLARE_GETSETNATIVE(Double, D),
1372
1373 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1374 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1375
1376 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1377 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1378 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1379
1380 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)},
1381 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)},
1382 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1383 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1384 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1385 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1386 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1387
1388 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1389 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1390 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1391 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1392 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1393 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1394 };
1395
1396 // These are the methods prior to the JSR 166 changes in 1.5.0
1397 static JNINativeMethod methods_141[] = {
1398 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1399 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1400
1401 DECLARE_GETSETOOP_141(Boolean, Z),
1402 DECLARE_GETSETOOP_141(Byte, B),
1403 DECLARE_GETSETOOP_141(Short, S),
1404 DECLARE_GETSETOOP_141(Char, C),
1405 DECLARE_GETSETOOP_141(Int, I),
1406 DECLARE_GETSETOOP_141(Long, J),
1407 DECLARE_GETSETOOP_141(Float, F),
1408 DECLARE_GETSETOOP_141(Double, D),
1409
1410 DECLARE_GETSETNATIVE(Byte, B),
1411 DECLARE_GETSETNATIVE(Short, S),
1412 DECLARE_GETSETNATIVE(Char, C),
1413 DECLARE_GETSETNATIVE(Int, I),
1414 DECLARE_GETSETNATIVE(Long, J),
1415 DECLARE_GETSETNATIVE(Float, F),
1416 DECLARE_GETSETNATIVE(Double, D),
1417
1418 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1419 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1420
1421 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1422 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1423 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1424
1425 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1426 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1427 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1428 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1429 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1430 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1431 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1432 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1433
1434 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1435 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1436 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1437 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1438 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1439 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1440
1441 };
1442
1443 // These are the methods prior to the JSR 166 changes in 1.6.0
1444 static JNINativeMethod methods_15[] = {
1445 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1446 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1447 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1448 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1449
1450
1451 DECLARE_GETSETOOP(Boolean, Z),
1452 DECLARE_GETSETOOP(Byte, B),
1453 DECLARE_GETSETOOP(Short, S),
1454 DECLARE_GETSETOOP(Char, C),
1455 DECLARE_GETSETOOP(Int, I),
1456 DECLARE_GETSETOOP(Long, J),
1457 DECLARE_GETSETOOP(Float, F),
1458 DECLARE_GETSETOOP(Double, D),
1459
1460 DECLARE_GETSETNATIVE(Byte, B),
1461 DECLARE_GETSETNATIVE(Short, S),
1462 DECLARE_GETSETNATIVE(Char, C),
1463 DECLARE_GETSETNATIVE(Int, I),
1464 DECLARE_GETSETNATIVE(Long, J),
1465 DECLARE_GETSETNATIVE(Float, F),
1466 DECLARE_GETSETNATIVE(Double, D),
1467
1468 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1469 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1470
1471 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1472 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1473 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1474
1475 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1476 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1477 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1478 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1479 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1480 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1481 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1482 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1483
1484 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1485 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1486 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1487 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1488 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1489 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1490 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1491 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1492 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1493 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1494 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1495
1496 };
1497
1498 // These are the methods for 1.6.0 and 1.7.0
1499 static JNINativeMethod methods_16[] = {
1500 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1501 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1502 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1503 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1504
1505 DECLARE_GETSETOOP(Boolean, Z),
1506 DECLARE_GETSETOOP(Byte, B),
1507 DECLARE_GETSETOOP(Short, S),
1508 DECLARE_GETSETOOP(Char, C),
1509 DECLARE_GETSETOOP(Int, I),
1510 DECLARE_GETSETOOP(Long, J),
1511 DECLARE_GETSETOOP(Float, F),
1512 DECLARE_GETSETOOP(Double, D),
1513
1514 DECLARE_GETSETNATIVE(Byte, B),
1515 DECLARE_GETSETNATIVE(Short, S),
1516 DECLARE_GETSETNATIVE(Char, C),
1517 DECLARE_GETSETNATIVE(Int, I),
1518 DECLARE_GETSETNATIVE(Long, J),
1519 DECLARE_GETSETNATIVE(Float, F),
1520 DECLARE_GETSETNATIVE(Double, D),
1521
1522 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1523 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1524
1525 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1526 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1527 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1528
1529 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1530 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1531 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1532 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1533 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1534 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1535 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1536 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1537
1538 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1539 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1540 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1541 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1542 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1543 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1544 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1545 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1546 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1547 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1548 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1549 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1550 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1551 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1552 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1553 };
1554
1555 // These are the methods for 1.8.0
1556 static JNINativeMethod methods_18[] = {
1557 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1558 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1559 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1560 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1561
1562 DECLARE_GETSETOOP(Boolean, Z),
1563 DECLARE_GETSETOOP(Byte, B),
1564 DECLARE_GETSETOOP(Short, S),
1565 DECLARE_GETSETOOP(Char, C),
1566 DECLARE_GETSETOOP(Int, I),
1567 DECLARE_GETSETOOP(Long, J),
1568 DECLARE_GETSETOOP(Float, F),
1569 DECLARE_GETSETOOP(Double, D),
1570
1571 DECLARE_GETSETNATIVE(Byte, B),
1572 DECLARE_GETSETNATIVE(Short, S),
1573 DECLARE_GETSETNATIVE(Char, C),
1574 DECLARE_GETSETNATIVE(Int, I),
1575 DECLARE_GETSETNATIVE(Long, J),
1576 DECLARE_GETSETNATIVE(Float, F),
1577 DECLARE_GETSETNATIVE(Double, D),
1578
1579 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1580 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1581
1582 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1583 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1584 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1585
1586 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1587 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1588 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1589 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1590 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1591 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1592 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1593 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1594
1595 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1596 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1597 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1598 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1599 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1600 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1601 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1602 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1603 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1604 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1605 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1606 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1607 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1608 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1609 };
1610
1611 JNINativeMethod loadavg_method[] = {
1612 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1613 };
1614
1615 JNINativeMethod prefetch_methods[] = {
1616 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1617 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1618 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1619 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1620 };
1621
1622 JNINativeMethod memcopy_methods_17[] = {
1623 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1624 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1625 };
1626
1627 JNINativeMethod memcopy_methods_15[] = {
1628 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1629 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1630 };
1631
1632 JNINativeMethod anonk_methods[] = {
1633 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1634 };
1635
1636 JNINativeMethod lform_methods[] = {
1637 {CC"shouldBeInitialized",CC"("CLS")Z", FN_PTR(Unsafe_ShouldBeInitialized)},
1638 };
1639
1640 JNINativeMethod fence_methods[] = {
1641 {CC"loadFence", CC"()V", FN_PTR(Unsafe_LoadFence)},
1642 {CC"storeFence", CC"()V", FN_PTR(Unsafe_StoreFence)},
1643 {CC"fullFence", CC"()V", FN_PTR(Unsafe_FullFence)},
1644 };
1645
1646 #undef CC
1647 #undef FN_PTR
1648
1649 #undef ADR
1650 #undef LANG
1651 #undef OBJ
1652 #undef CLS
1653 #undef CTR
1654 #undef FLD
1655 #undef MTH
1656 #undef THR
1657 #undef DC0_Args
1658 #undef DC_Args
1659
1660 #undef DECLARE_GETSETOOP
1661 #undef DECLARE_GETSETNATIVE
1662
1663
1664 /**
1665 * Helper method to register native methods.
1666 */
1667 static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1668 int status = env->RegisterNatives(clazz, methods, nMethods);
1669 if (status < 0 || env->ExceptionOccurred()) {
1670 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1671 tty->print_cr("Unsafe: failed registering %s", message);
1672 }
1673 env->ExceptionClear();
1674 return false;
1675 } else {
1676 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1677 tty->print_cr("Unsafe: successfully registered %s", message);
1678 }
1679 return true;
1680 }
1681 }
1682
1683
1684 // This one function is exported, used by NativeLookup.
1685 // The Unsafe_xxx functions above are called only from the interpreter.
1686 // The optimizer looks at names and signatures to recognize
1687 // individual functions.
1688
1689 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1690 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1691 {
1692 ThreadToNativeFromVM ttnfv(thread);
1693
1694 // Unsafe methods
1695 {
1696 bool success = false;
1697 // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6
1698 if (!success) {
1699 success = register_natives("1.6 methods", env, unsafecls, methods_16, sizeof(methods_16)/sizeof(JNINativeMethod));
1700 }
1701 if (!success) {
1702 success = register_natives("1.8 methods", env, unsafecls, methods_18, sizeof(methods_18)/sizeof(JNINativeMethod));
1703 }
1704 if (!success) {
1705 success = register_natives("1.5 methods", env, unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1706 }
1707 if (!success) {
1708 success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1709 }
1710 if (!success) {
1711 success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1712 }
1713 guarantee(success, "register unsafe natives");
1714 }
1715
1716 // Unsafe.getLoadAverage
1717 register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1718
1719 // Prefetch methods
1720 register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1721
1722 // Memory copy methods
1723 {
1724 bool success = false;
1725 if (!success) {
1726 success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod));
1727 }
1728 if (!success) {
1729 success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1730 }
1731 }
1732
1733 // Unsafe.defineAnonymousClass
1734 register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1735
1736 // Unsafe.shouldBeInitialized
1737 register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod));
1738
1739 // Fence methods
1740 register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod));
1741 }
1742 JVM_END