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 if (env->ExceptionCheck()) {
862 env->ExceptionClear();
863 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf);
864 return;
865 }
866 char* msg = NULL;
867 env->ThrowNew(cls, msg);
868 }
869
870 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
871 {
872 // Code lifted from JDK 1.3 ClassLoader.c
873
874 jbyte *body;
875 char *utfName;
876 jclass result = 0;
877 char buf[128];
878
879 if (UsePerfData) {
880 ClassLoader::unsafe_defineClassCallCounter()->inc();
881 }
882
883 if (data == NULL) {
884 throw_new(env, "NullPointerException");
885 return 0;
886 }
887
888 /* Work around 4153825. malloc crashes on Solaris when passed a
889 * negative size.
890 */
891 if (length < 0) {
892 throw_new(env, "ArrayIndexOutOfBoundsException");
893 return 0;
894 }
895
896 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
897
898 if (body == 0) {
899 throw_new(env, "OutOfMemoryError");
900 return 0;
901 }
902
903 env->GetByteArrayRegion(data, offset, length, body);
904
905 if (env->ExceptionOccurred())
906 goto free_body;
907
908 if (name != NULL) {
909 uint len = env->GetStringUTFLength(name);
910 int unicode_len = env->GetStringLength(name);
911 if (len >= sizeof(buf)) {
912 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
913 if (utfName == NULL) {
914 throw_new(env, "OutOfMemoryError");
915 goto free_body;
916 }
917 } else {
918 utfName = buf;
919 }
920 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
921 //VerifyFixClassname(utfName);
922 for (uint i = 0; i < len; i++) {
923 if (utfName[i] == '.') utfName[i] = '/';
924 }
925 } else {
926 utfName = NULL;
927 }
928
929 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
930
931 if (utfName && utfName != buf)
932 FREE_C_HEAP_ARRAY(char, utfName, mtInternal);
933
934 free_body:
935 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal);
936 return result;
937 }
938 }
939
940
941 UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
942 UnsafeWrapper("Unsafe_DefineClass");
943 {
944 ThreadToNativeFromVM ttnfv(thread);
945 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
946 }
947 UNSAFE_END
948
949
950 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
951 UnsafeWrapper("Unsafe_DefineClass");
952 {
953 ThreadToNativeFromVM ttnfv(thread);
954
955 int depthFromDefineClass0 = 1;
956 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
957 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
958 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
959
960 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
961 }
962 UNSAFE_END
963
964
965 #define DAC_Args CLS"[B["OBJ
966 // define a class but do not make it known to the class loader or system dictionary
967 // - host_class: supplies context for linkage, access control, protection domain, and class loader
968 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
969 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
970
971 // When you load an anonymous class U, it works as if you changed its name just before loading,
972 // to a name that you will never use again. Since the name is lost, no other class can directly
973 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
974 // through java.lang.Class methods like Class.newInstance.
975
976 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
977 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
978 // An anonymous class also has special privileges to access any member of its host class.
979 // This is the main reason why this loading operation is unsafe. The purpose of this is to
980 // allow language implementations to simulate "open classes"; a host class in effect gets
981 // new code when an anonymous class is loaded alongside it. A less convenient but more
982 // standard way to do this is with reflection, which can also be set to ignore access
983 // restrictions.
984
985 // Access into an anonymous class is possible only through reflection. Therefore, there
986 // are no special access rules for calling into an anonymous class. The relaxed access
987 // rule for the host class is applied in the opposite direction: A host class reflectively
988 // access one of its anonymous classes.
989
990 // If you load the same bytecodes twice, you get two different classes. You can reload
991 // the same bytecodes with or without varying CP patches.
992
993 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
994 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
995 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
996
997 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
998 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
999 // It is not possible for a named class, or an older anonymous class, to refer by
1000 // name (via its CP) to a newer anonymous class.
1001
1002 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
1003 // or type descriptors used in the loaded anonymous class.
1004
1005 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
1006 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
1007 // be changed to println(greeting), where greeting is an arbitrary object created before
1008 // the anonymous class is loaded. This is useful in dynamic languages, in which
1009 // various kinds of metaobjects must be introduced as constants into bytecode.
1010 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
1011 // not just a literal string. For such ldc instructions, the verifier uses the
1012 // type Object instead of String, if the loaded constant is not in fact a String.
1013
1014 static instanceKlassHandle
1015 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
1016 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
1017 HeapWord* *temp_alloc,
1018 TRAPS) {
1019
1020 if (UsePerfData) {
1021 ClassLoader::unsafe_defineClassCallCounter()->inc();
1022 }
1023
1024 if (data == NULL) {
1025 THROW_0(vmSymbols::java_lang_NullPointerException());
1026 }
1027
1028 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
1029 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
1030 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal);
1031 if (body == NULL) {
1032 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1033 }
1034
1035 // caller responsible to free it:
1036 (*temp_alloc) = body;
1037
1038 {
1039 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1040 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1041 }
1042
1043 u1* class_bytes = (u1*) body;
1044 int class_bytes_length = (int) length;
1045 if (class_bytes_length < 0) class_bytes_length = 0;
1046 if (class_bytes == NULL
1047 || host_class == NULL
1048 || length != class_bytes_length)
1049 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1050
1051 objArrayHandle cp_patches_h;
1052 if (cp_patches_jh != NULL) {
1053 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1054 if (!p->is_objArray())
1055 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1056 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1057 }
1058
1059 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class)));
1060 const char* host_source = host_klass->external_name();
1061 Handle host_loader(THREAD, host_klass->class_loader());
1062 Handle host_domain(THREAD, host_klass->protection_domain());
1063
1064 GrowableArray<Handle>* cp_patches = NULL;
1065 if (cp_patches_h.not_null()) {
1066 int alen = cp_patches_h->length();
1067 for (int i = alen-1; i >= 0; i--) {
1068 oop p = cp_patches_h->obj_at(i);
1069 if (p != NULL) {
1070 Handle patch(THREAD, p);
1071 if (cp_patches == NULL)
1072 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1073 cp_patches->at_put(i, patch);
1074 }
1075 }
1076 }
1077
1078 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1079
1080 instanceKlassHandle anon_klass;
1081 {
1082 Symbol* no_class_name = NULL;
1083 Klass* anonk = SystemDictionary::parse_stream(no_class_name,
1084 host_loader, host_domain,
1085 &st, host_klass, cp_patches,
1086 CHECK_NULL);
1087 if (anonk == NULL) return NULL;
1088 anon_klass = instanceKlassHandle(THREAD, anonk);
1089 }
1090
1091 return anon_klass;
1092 }
1093
1094 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1095 {
1096 instanceKlassHandle anon_klass;
1097 jobject res_jh = NULL;
1098
1099 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1100 ResourceMark rm(THREAD);
1101
1102 HeapWord* temp_alloc = NULL;
1103
1104 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data,
1105 cp_patches_jh,
1106 &temp_alloc, THREAD);
1107 if (anon_klass() != NULL)
1108 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
1109
1110 // try/finally clause:
1111 if (temp_alloc != NULL) {
1112 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal);
1113 }
1114
1115 // The anonymous class loader data has been artificially been kept alive to
1116 // this point. The mirror and any instances of this class have to keep
1117 // it alive afterwards.
1118 if (anon_klass() != NULL) {
1119 anon_klass->class_loader_data()->set_keep_alive(false);
1120 }
1121
1122 // let caller initialize it as needed...
1123
1124 return (jclass) res_jh;
1125 }
1126 UNSAFE_END
1127
1128
1129
1130 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1131 UnsafeWrapper("Unsafe_MonitorEnter");
1132 {
1133 if (jobj == NULL) {
1134 THROW(vmSymbols::java_lang_NullPointerException());
1135 }
1136 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1137 ObjectSynchronizer::jni_enter(obj, CHECK);
1138 }
1139 UNSAFE_END
1140
1141
1142 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1143 UnsafeWrapper("Unsafe_TryMonitorEnter");
1144 {
1145 if (jobj == NULL) {
1146 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1147 }
1148 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1149 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1150 return (res ? JNI_TRUE : JNI_FALSE);
1151 }
1152 UNSAFE_END
1153
1154
1155 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1156 UnsafeWrapper("Unsafe_MonitorExit");
1157 {
1158 if (jobj == NULL) {
1159 THROW(vmSymbols::java_lang_NullPointerException());
1160 }
1161 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1162 ObjectSynchronizer::jni_exit(obj(), CHECK);
1163 }
1164 UNSAFE_END
1165
1166
1167 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1168 UnsafeWrapper("Unsafe_ThrowException");
1169 {
1170 ThreadToNativeFromVM ttnfv(thread);
1171 env->Throw(thr);
1172 }
1173 UNSAFE_END
1174
1175 // JSR166 ------------------------------------------------------------------
1176
1177 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1178 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1179 oop x = JNIHandles::resolve(x_h);
1180 oop e = JNIHandles::resolve(e_h);
1181 oop p = JNIHandles::resolve(obj);
1182 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1183 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
1184 jboolean success = (res == e);
1185 if (success)
1186 update_barrier_set((void*)addr, x);
1187 return success;
1188 UNSAFE_END
1189
1190 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1191 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1192 oop p = JNIHandles::resolve(obj);
1193 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1194 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1195 UNSAFE_END
1196
1197 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1198 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1199 Handle p (THREAD, JNIHandles::resolve(obj));
1200 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1201 if (VM_Version::supports_cx8())
1202 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1203 else {
1204 jboolean success = false;
1205 ObjectLocker ol(p, THREAD);
1206 if (*addr == e) { *addr = x; success = true; }
1207 return success;
1208 }
1209 UNSAFE_END
1210
1211 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1212 UnsafeWrapper("Unsafe_Park");
1213 EventThreadPark event;
1214 #ifndef USDT2
1215 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1216 #else /* USDT2 */
1217 HOTSPOT_THREAD_PARK_BEGIN(
1218 (uintptr_t) thread->parker(), (int) isAbsolute, time);
1219 #endif /* USDT2 */
1220 JavaThreadParkedState jtps(thread, time != 0);
1221 thread->parker()->park(isAbsolute != 0, time);
1222 #ifndef USDT2
1223 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1224 #else /* USDT2 */
1225 HOTSPOT_THREAD_PARK_END(
1226 (uintptr_t) thread->parker());
1227 #endif /* USDT2 */
1228 if (event.should_commit()) {
1229 oop obj = thread->current_park_blocker();
1230 event.set_klass((obj != NULL) ? obj->klass() : NULL);
1231 event.set_timeout(time);
1232 event.set_address((obj != NULL) ? (TYPE_ADDRESS) cast_from_oop<uintptr_t>(obj) : 0);
1233 event.commit();
1234 }
1235 UNSAFE_END
1236
1237 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1238 UnsafeWrapper("Unsafe_Unpark");
1239 Parker* p = NULL;
1240 if (jthread != NULL) {
1241 oop java_thread = JNIHandles::resolve_non_null(jthread);
1242 if (java_thread != NULL) {
1243 jlong lp = java_lang_Thread::park_event(java_thread);
1244 if (lp != 0) {
1245 // This cast is OK even though the jlong might have been read
1246 // non-atomically on 32bit systems, since there, one word will
1247 // always be zero anyway and the value set is always the same
1248 p = (Parker*)addr_from_java(lp);
1249 } else {
1250 // Grab lock if apparently null or using older version of library
1251 MutexLocker mu(Threads_lock);
1252 java_thread = JNIHandles::resolve_non_null(jthread);
1253 if (java_thread != NULL) {
1254 JavaThread* thr = java_lang_Thread::thread(java_thread);
1255 if (thr != NULL) {
1256 p = thr->parker();
1257 if (p != NULL) { // Bind to Java thread for next time.
1258 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1259 }
1260 }
1261 }
1262 }
1263 }
1264 }
1265 if (p != NULL) {
1266 #ifndef USDT2
1267 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1268 #else /* USDT2 */
1269 HOTSPOT_THREAD_UNPARK(
1270 (uintptr_t) p);
1271 #endif /* USDT2 */
1272 p->unpark();
1273 }
1274 UNSAFE_END
1275
1276 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1277 UnsafeWrapper("Unsafe_Loadavg");
1278 const int max_nelem = 3;
1279 double la[max_nelem];
1280 jint ret;
1281
1282 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1283 assert(a->is_typeArray(), "must be type array");
1284
1285 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1286 ThreadToNativeFromVM ttnfv(thread);
1287 throw_new(env, "ArrayIndexOutOfBoundsException");
1288 return -1;
1289 }
1290
1291 ret = os::loadavg(la, nelem);
1292 if (ret == -1) return -1;
1293
1294 // if successful, ret is the number of samples actually retrieved.
1295 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1296 switch(ret) {
1297 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1298 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1299 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1300 }
1301 return ret;
1302 UNSAFE_END
1303
1304 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1305 UnsafeWrapper("Unsafe_PrefetchRead");
1306 oop p = JNIHandles::resolve(obj);
1307 void* addr = index_oop_from_field_offset_long(p, 0);
1308 Prefetch::read(addr, (intx)offset);
1309 UNSAFE_END
1310
1311 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1312 UnsafeWrapper("Unsafe_PrefetchWrite");
1313 oop p = JNIHandles::resolve(obj);
1314 void* addr = index_oop_from_field_offset_long(p, 0);
1315 Prefetch::write(addr, (intx)offset);
1316 UNSAFE_END
1317
1318
1319 /// JVM_RegisterUnsafeMethods
1320
1321 #define ADR "J"
1322
1323 #define LANG "Ljava/lang/"
1324
1325 #define OBJ LANG"Object;"
1326 #define CLS LANG"Class;"
1327 #define CTR LANG"reflect/Constructor;"
1328 #define FLD LANG"reflect/Field;"
1329 #define MTH LANG"reflect/Method;"
1330 #define THR LANG"Throwable;"
1331
1332 #define DC0_Args LANG"String;[BII"
1333 #define DC_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1334
1335 #define CC (char*) /*cast a literal from (const char*)*/
1336 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1337
1338 // define deprecated accessors for compabitility with 1.4.0
1339 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1340 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1341 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1342
1343 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1344 #define DECLARE_GETSETOOP_141(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
1348 // Note: In 1.5.0, there are volatile versions too
1349 #define DECLARE_GETSETOOP(Boolean, Z) \
1350 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1351 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1352 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1353 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1354
1355
1356 #define DECLARE_GETSETNATIVE(Byte, B) \
1357 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1358 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1359
1360
1361
1362 // These are the methods for 1.4.0
1363 static JNINativeMethod methods_140[] = {
1364 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)},
1365 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)},
1366
1367 DECLARE_GETSETOOP_140(Boolean, Z),
1368 DECLARE_GETSETOOP_140(Byte, B),
1369 DECLARE_GETSETOOP_140(Short, S),
1370 DECLARE_GETSETOOP_140(Char, C),
1371 DECLARE_GETSETOOP_140(Int, I),
1372 DECLARE_GETSETOOP_140(Long, J),
1373 DECLARE_GETSETOOP_140(Float, F),
1374 DECLARE_GETSETOOP_140(Double, D),
1375
1376 DECLARE_GETSETNATIVE(Byte, B),
1377 DECLARE_GETSETNATIVE(Short, S),
1378 DECLARE_GETSETNATIVE(Char, C),
1379 DECLARE_GETSETNATIVE(Int, I),
1380 DECLARE_GETSETNATIVE(Long, J),
1381 DECLARE_GETSETNATIVE(Float, F),
1382 DECLARE_GETSETNATIVE(Double, D),
1383
1384 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1385 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1386
1387 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1388 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1389 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1390
1391 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)},
1392 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)},
1393 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1394 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1395 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1396 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1397 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1398
1399 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1400 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1401 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1402 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1403 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1404 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1405 };
1406
1407 // These are the methods prior to the JSR 166 changes in 1.5.0
1408 static JNINativeMethod methods_141[] = {
1409 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1410 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1411
1412 DECLARE_GETSETOOP_141(Boolean, Z),
1413 DECLARE_GETSETOOP_141(Byte, B),
1414 DECLARE_GETSETOOP_141(Short, S),
1415 DECLARE_GETSETOOP_141(Char, C),
1416 DECLARE_GETSETOOP_141(Int, I),
1417 DECLARE_GETSETOOP_141(Long, J),
1418 DECLARE_GETSETOOP_141(Float, F),
1419 DECLARE_GETSETOOP_141(Double, D),
1420
1421 DECLARE_GETSETNATIVE(Byte, B),
1422 DECLARE_GETSETNATIVE(Short, S),
1423 DECLARE_GETSETNATIVE(Char, C),
1424 DECLARE_GETSETNATIVE(Int, I),
1425 DECLARE_GETSETNATIVE(Long, J),
1426 DECLARE_GETSETNATIVE(Float, F),
1427 DECLARE_GETSETNATIVE(Double, D),
1428
1429 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1430 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1431
1432 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1433 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1434 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1435
1436 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1437 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1438 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1439 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1440 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1441 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1442 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1443 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1444
1445 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1446 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1447 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1448 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1449 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1450 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1451
1452 };
1453
1454 // These are the methods prior to the JSR 166 changes in 1.6.0
1455 static JNINativeMethod methods_15[] = {
1456 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1457 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1458 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1459 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1460
1461
1462 DECLARE_GETSETOOP(Boolean, Z),
1463 DECLARE_GETSETOOP(Byte, B),
1464 DECLARE_GETSETOOP(Short, S),
1465 DECLARE_GETSETOOP(Char, C),
1466 DECLARE_GETSETOOP(Int, I),
1467 DECLARE_GETSETOOP(Long, J),
1468 DECLARE_GETSETOOP(Float, F),
1469 DECLARE_GETSETOOP(Double, D),
1470
1471 DECLARE_GETSETNATIVE(Byte, B),
1472 DECLARE_GETSETNATIVE(Short, S),
1473 DECLARE_GETSETNATIVE(Char, C),
1474 DECLARE_GETSETNATIVE(Int, I),
1475 DECLARE_GETSETNATIVE(Long, J),
1476 DECLARE_GETSETNATIVE(Float, F),
1477 DECLARE_GETSETNATIVE(Double, D),
1478
1479 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1480 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1481
1482 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1483 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1484 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1485
1486 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1487 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1488 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1489 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1490 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1491 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1492 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1493 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1494
1495 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1496 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1497 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1498 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1499 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1500 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1501 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1502 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1503 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1504 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1505 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1506
1507 };
1508
1509 // These are the methods for 1.6.0 and 1.7.0
1510 static JNINativeMethod methods_16[] = {
1511 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1512 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1513 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1514 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1515
1516 DECLARE_GETSETOOP(Boolean, Z),
1517 DECLARE_GETSETOOP(Byte, B),
1518 DECLARE_GETSETOOP(Short, S),
1519 DECLARE_GETSETOOP(Char, C),
1520 DECLARE_GETSETOOP(Int, I),
1521 DECLARE_GETSETOOP(Long, J),
1522 DECLARE_GETSETOOP(Float, F),
1523 DECLARE_GETSETOOP(Double, D),
1524
1525 DECLARE_GETSETNATIVE(Byte, B),
1526 DECLARE_GETSETNATIVE(Short, S),
1527 DECLARE_GETSETNATIVE(Char, C),
1528 DECLARE_GETSETNATIVE(Int, I),
1529 DECLARE_GETSETNATIVE(Long, J),
1530 DECLARE_GETSETNATIVE(Float, F),
1531 DECLARE_GETSETNATIVE(Double, D),
1532
1533 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1534 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1535
1536 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1537 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1538 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1539
1540 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1541 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1542 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1543 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1544 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1545 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1546 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1547 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1548
1549 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1550 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1551 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1552 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1553 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1554 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1555 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1556 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1557 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1558 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1559 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1560 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1561 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1562 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1563 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1564 };
1565
1566 // These are the methods for 1.8.0
1567 static JNINativeMethod methods_18[] = {
1568 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1569 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1570 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1571 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1572
1573 DECLARE_GETSETOOP(Boolean, Z),
1574 DECLARE_GETSETOOP(Byte, B),
1575 DECLARE_GETSETOOP(Short, S),
1576 DECLARE_GETSETOOP(Char, C),
1577 DECLARE_GETSETOOP(Int, I),
1578 DECLARE_GETSETOOP(Long, J),
1579 DECLARE_GETSETOOP(Float, F),
1580 DECLARE_GETSETOOP(Double, D),
1581
1582 DECLARE_GETSETNATIVE(Byte, B),
1583 DECLARE_GETSETNATIVE(Short, S),
1584 DECLARE_GETSETNATIVE(Char, C),
1585 DECLARE_GETSETNATIVE(Int, I),
1586 DECLARE_GETSETNATIVE(Long, J),
1587 DECLARE_GETSETNATIVE(Float, F),
1588 DECLARE_GETSETNATIVE(Double, D),
1589
1590 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1591 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1592
1593 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1594 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1595 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1596
1597 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1598 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1599 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1600 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1601 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1602 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1603 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1604 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1605
1606 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1607 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1608 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1609 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1610 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1611 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1612 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1613 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1614 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1615 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1616 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1617 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1618 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1619 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1620 };
1621
1622 JNINativeMethod loadavg_method[] = {
1623 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1624 };
1625
1626 JNINativeMethod prefetch_methods[] = {
1627 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1628 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1629 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1630 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1631 };
1632
1633 JNINativeMethod memcopy_methods_17[] = {
1634 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1635 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1636 };
1637
1638 JNINativeMethod memcopy_methods_15[] = {
1639 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1640 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1641 };
1642
1643 JNINativeMethod anonk_methods[] = {
1644 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1645 };
1646
1647 JNINativeMethod lform_methods[] = {
1648 {CC"shouldBeInitialized",CC"("CLS")Z", FN_PTR(Unsafe_ShouldBeInitialized)},
1649 };
1650
1651 JNINativeMethod fence_methods[] = {
1652 {CC"loadFence", CC"()V", FN_PTR(Unsafe_LoadFence)},
1653 {CC"storeFence", CC"()V", FN_PTR(Unsafe_StoreFence)},
1654 {CC"fullFence", CC"()V", FN_PTR(Unsafe_FullFence)},
1655 };
1656
1657 #undef CC
1658 #undef FN_PTR
1659
1660 #undef ADR
1661 #undef LANG
1662 #undef OBJ
1663 #undef CLS
1664 #undef CTR
1665 #undef FLD
1666 #undef MTH
1667 #undef THR
1668 #undef DC0_Args
1669 #undef DC_Args
1670
1671 #undef DECLARE_GETSETOOP
1672 #undef DECLARE_GETSETNATIVE
1673
1674
1675 /**
1676 * Helper method to register native methods.
1677 */
1678 static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1679 int status = env->RegisterNatives(clazz, methods, nMethods);
1680 if (status < 0 || env->ExceptionOccurred()) {
1681 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1682 tty->print_cr("Unsafe: failed registering %s", message);
1683 }
1684 env->ExceptionClear();
1685 return false;
1686 } else {
1687 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1688 tty->print_cr("Unsafe: successfully registered %s", message);
1689 }
1690 return true;
1691 }
1692 }
1693
1694
1695 // This one function is exported, used by NativeLookup.
1696 // The Unsafe_xxx functions above are called only from the interpreter.
1697 // The optimizer looks at names and signatures to recognize
1698 // individual functions.
1699
1700 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1701 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1702 {
1703 ThreadToNativeFromVM ttnfv(thread);
1704
1705 // Unsafe methods
1706 {
1707 bool success = false;
1708 // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6
1709 if (!success) {
1710 success = register_natives("1.6 methods", env, unsafecls, methods_16, sizeof(methods_16)/sizeof(JNINativeMethod));
1711 }
1712 if (!success) {
1713 success = register_natives("1.8 methods", env, unsafecls, methods_18, sizeof(methods_18)/sizeof(JNINativeMethod));
1714 }
1715 if (!success) {
1716 success = register_natives("1.5 methods", env, unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1717 }
1718 if (!success) {
1719 success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1720 }
1721 if (!success) {
1722 success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1723 }
1724 guarantee(success, "register unsafe natives");
1725 }
1726
1727 // Unsafe.getLoadAverage
1728 register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1729
1730 // Prefetch methods
1731 register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1732
1733 // Memory copy methods
1734 {
1735 bool success = false;
1736 if (!success) {
1737 success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod));
1738 }
1739 if (!success) {
1740 success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1741 }
1742 }
1743
1744 // Unsafe.defineAnonymousClass
1745 if (EnableInvokeDynamic) {
1746 register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1747 }
1748
1749 // Unsafe.shouldBeInitialized
1750 if (EnableInvokeDynamic) {
1751 register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod));
1752 }
1753
1754 // Fence methods
1755 register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod));
1756 }
1757 JVM_END