1 /*
2 * Copyright (c) 2000, 2012, 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 "utilities/copy.hpp"
40 #include "utilities/dtrace.hpp"
41
42 /*
43 * Implementation of class sun.misc.Unsafe
44 */
45
46 #ifndef USDT2
47 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long);
48 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t);
49 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t);
50 #endif /* !USDT2 */
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 // Don't allow unsafe to be used to read or write the header word of oops
119 assert(p == NULL || field_offset >= oopDesc::header_size(), "offset must be outside of header");
120 #ifdef ASSERT
121 if (p != NULL) {
122 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
123 if (byte_offset == (jint)byte_offset) {
124 void* ptr_plus_disp = (address)p + byte_offset;
125 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
126 "raw [ptr+disp] must be consistent with oop::field_base");
127 }
128 jlong p_size = HeapWordSize * (jlong)(p->size());
129 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size));
130 }
131 #endif
132 if (sizeof(char*) == sizeof(jint)) // (this constant folds!)
133 return (address)p + (jint) byte_offset;
134 else
135 return (address)p + byte_offset;
136 }
137
138 // Externally callable versions:
139 // (Use these in compiler intrinsics which emulate unsafe primitives.)
140 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
141 return field_offset;
142 }
143 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
144 return byte_offset;
145 }
146 jint Unsafe_invocation_key_from_method_slot(jint slot) {
147 return invocation_key_from_method_slot(slot);
148 }
149 jint Unsafe_invocation_key_to_method_slot(jint key) {
150 return invocation_key_to_method_slot(key);
151 }
152
153
154 ///// Data in the Java heap.
155
156 #define GET_FIELD(obj, offset, type_name, v) \
157 oop p = JNIHandles::resolve(obj); \
158 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
159
160 #define SET_FIELD(obj, offset, type_name, x) \
161 oop p = JNIHandles::resolve(obj); \
162 *(type_name*)index_oop_from_field_offset_long(p, offset) = x
163
164 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
165 oop p = JNIHandles::resolve(obj); \
166 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
167
168 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
169 oop p = JNIHandles::resolve(obj); \
170 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x);
171
172 // Macros for oops that check UseCompressedOops
173
174 #define GET_OOP_FIELD(obj, offset, v) \
175 oop p = JNIHandles::resolve(obj); \
176 oop v; \
177 if (UseCompressedOops) { \
178 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
179 v = oopDesc::decode_heap_oop(n); \
180 } else { \
181 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
182 }
183
184
185 // Get/SetObject must be special-cased, since it works with handles.
186
187 // The xxx140 variants for backward compatibility do not allow a full-width offset.
188 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
189 UnsafeWrapper("Unsafe_GetObject");
190 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
191 GET_OOP_FIELD(obj, offset, v)
192 jobject ret = JNIHandles::make_local(env, v);
193 #if INCLUDE_ALL_GCS
194 // We could be accessing the referent field in a reference
195 // object. If G1 is enabled then we need to register a non-null
196 // referent with the SATB barrier.
197 if (UseG1GC) {
198 bool needs_barrier = false;
199
200 if (ret != NULL) {
201 if (offset == java_lang_ref_Reference::referent_offset) {
202 oop o = JNIHandles::resolve_non_null(obj);
203 Klass* k = o->klass();
204 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
205 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
206 needs_barrier = true;
207 }
208 }
209 }
210
211 if (needs_barrier) {
212 oop referent = JNIHandles::resolve(ret);
213 G1SATBCardTableModRefBS::enqueue(referent);
214 }
215 }
216 #endif // INCLUDE_ALL_GCS
217 return ret;
218 UNSAFE_END
219
220 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
221 UnsafeWrapper("Unsafe_SetObject");
222 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
223 oop x = JNIHandles::resolve(x_h);
224 //SET_FIELD(obj, offset, oop, x);
225 oop p = JNIHandles::resolve(obj);
226 if (UseCompressedOops) {
227 if (x != NULL) {
228 // If there is a heap base pointer, we are obliged to emit a store barrier.
229 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
230 } else {
231 narrowOop n = oopDesc::encode_heap_oop_not_null(x);
232 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
233 }
234 } else {
235 if (x != NULL) {
236 // If there is a heap base pointer, we are obliged to emit a store barrier.
237 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
238 } else {
239 *(oop*)index_oop_from_field_offset_long(p, offset) = x;
240 }
241 }
242 UNSAFE_END
243
244 // The normal variants allow a null base pointer with an arbitrary address.
245 // But if the base pointer is non-null, the offset should make some sense.
246 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
247 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
248 UnsafeWrapper("Unsafe_GetObject");
249 GET_OOP_FIELD(obj, offset, v)
250 jobject ret = JNIHandles::make_local(env, v);
251 #if INCLUDE_ALL_GCS
252 // We could be accessing the referent field in a reference
253 // object. If G1 is enabled then we need to register non-null
254 // referent with the SATB barrier.
255 if (UseG1GC) {
256 bool needs_barrier = false;
257
258 if (ret != NULL) {
259 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) {
260 oop o = JNIHandles::resolve(obj);
261 Klass* k = o->klass();
262 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
263 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
264 needs_barrier = true;
265 }
266 }
267 }
268
269 if (needs_barrier) {
270 oop referent = JNIHandles::resolve(ret);
271 G1SATBCardTableModRefBS::enqueue(referent);
272 }
273 }
274 #endif // INCLUDE_ALL_GCS
275 return ret;
276 UNSAFE_END
277
278 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
279 UnsafeWrapper("Unsafe_SetObject");
280 oop x = JNIHandles::resolve(x_h);
281 oop p = JNIHandles::resolve(obj);
282 if (UseCompressedOops) {
283 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
284 } else {
285 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
286 }
287 UNSAFE_END
288
289 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
290 UnsafeWrapper("Unsafe_GetObjectVolatile");
291 oop p = JNIHandles::resolve(obj);
292 void* addr = index_oop_from_field_offset_long(p, offset);
293 volatile oop v;
294 if (UseCompressedOops) {
295 volatile narrowOop n = *(volatile narrowOop*) addr;
296 v = oopDesc::decode_heap_oop(n);
297 } else {
298 v = *(volatile oop*) addr;
299 }
300 OrderAccess::acquire();
301 return JNIHandles::make_local(env, v);
302 UNSAFE_END
303
304 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
305 UnsafeWrapper("Unsafe_SetObjectVolatile");
306 oop x = JNIHandles::resolve(x_h);
307 oop p = JNIHandles::resolve(obj);
308 void* addr = index_oop_from_field_offset_long(p, offset);
309 OrderAccess::release();
310 if (UseCompressedOops) {
311 oop_store((narrowOop*)addr, x);
312 } else {
313 oop_store((oop*)addr, x);
314 }
315 OrderAccess::fence();
316 UNSAFE_END
317
318 #if defined(SPARC) || defined(X86)
319 // Sparc and X86 have atomic jlong (8 bytes) instructions
320
321 #else
322 // Keep old code for platforms which may not have atomic jlong (8 bytes) instructions
323
324 // Volatile long versions must use locks if !VM_Version::supports_cx8().
325 // support_cx8 is a surrogate for 'supports atomic long memory ops'.
326
327 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
328 UnsafeWrapper("Unsafe_GetLongVolatile");
329 {
330 if (VM_Version::supports_cx8()) {
331 GET_FIELD_VOLATILE(obj, offset, jlong, v);
332 return v;
333 }
334 else {
335 Handle p (THREAD, JNIHandles::resolve(obj));
336 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
337 ObjectLocker ol(p, THREAD);
338 jlong value = *addr;
339 return value;
340 }
341 }
342 UNSAFE_END
343
344 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
345 UnsafeWrapper("Unsafe_SetLongVolatile");
346 {
347 if (VM_Version::supports_cx8()) {
348 SET_FIELD_VOLATILE(obj, offset, jlong, x);
349 }
350 else {
351 Handle p (THREAD, JNIHandles::resolve(obj));
352 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
353 ObjectLocker ol(p, THREAD);
354 *addr = x;
355 }
356 }
357 UNSAFE_END
358
359 #endif // not SPARC and not X86
360
361 #define DEFINE_GETSETOOP(jboolean, Boolean) \
362 \
363 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
364 UnsafeWrapper("Unsafe_Get"#Boolean); \
365 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
366 GET_FIELD(obj, offset, jboolean, v); \
367 return v; \
368 UNSAFE_END \
369 \
370 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
371 UnsafeWrapper("Unsafe_Set"#Boolean); \
372 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
373 SET_FIELD(obj, offset, jboolean, x); \
374 UNSAFE_END \
375 \
376 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
377 UnsafeWrapper("Unsafe_Get"#Boolean); \
378 GET_FIELD(obj, offset, jboolean, v); \
379 return v; \
380 UNSAFE_END \
381 \
382 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
383 UnsafeWrapper("Unsafe_Set"#Boolean); \
384 SET_FIELD(obj, offset, jboolean, x); \
385 UNSAFE_END \
386 \
387 // END DEFINE_GETSETOOP.
388
389 DEFINE_GETSETOOP(jboolean, Boolean)
390 DEFINE_GETSETOOP(jbyte, Byte)
391 DEFINE_GETSETOOP(jshort, Short);
392 DEFINE_GETSETOOP(jchar, Char);
393 DEFINE_GETSETOOP(jint, Int);
394 DEFINE_GETSETOOP(jlong, Long);
395 DEFINE_GETSETOOP(jfloat, Float);
396 DEFINE_GETSETOOP(jdouble, Double);
397
398 #undef DEFINE_GETSETOOP
399
400 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
401 \
402 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
403 UnsafeWrapper("Unsafe_Get"#Boolean); \
404 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
405 return v; \
406 UNSAFE_END \
407 \
408 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
409 UnsafeWrapper("Unsafe_Set"#Boolean); \
410 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
411 UNSAFE_END \
412 \
413 // END DEFINE_GETSETOOP_VOLATILE.
414
415 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
416 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
417 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
418 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
419 DEFINE_GETSETOOP_VOLATILE(jint, Int);
420 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
421 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
422
423 #if defined(SPARC) || defined(X86)
424 // Sparc and X86 have atomic jlong (8 bytes) instructions
425 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
426 #endif
427
428 #undef DEFINE_GETSETOOP_VOLATILE
429
430 // The non-intrinsified versions of setOrdered just use setVolatile
431
432 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
433 UnsafeWrapper("Unsafe_SetOrderedInt");
434 SET_FIELD_VOLATILE(obj, offset, jint, x);
435 UNSAFE_END
436
437 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
438 UnsafeWrapper("Unsafe_SetOrderedObject");
439 oop x = JNIHandles::resolve(x_h);
440 oop p = JNIHandles::resolve(obj);
441 void* addr = index_oop_from_field_offset_long(p, offset);
442 OrderAccess::release();
443 if (UseCompressedOops) {
444 oop_store((narrowOop*)addr, x);
445 } else {
446 oop_store((oop*)addr, x);
447 }
448 OrderAccess::fence();
449 UNSAFE_END
450
451 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
452 UnsafeWrapper("Unsafe_SetOrderedLong");
453 #if defined(SPARC) || defined(X86)
454 // Sparc and X86 have atomic jlong (8 bytes) instructions
455 SET_FIELD_VOLATILE(obj, offset, jlong, x);
456 #else
457 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
458 {
459 if (VM_Version::supports_cx8()) {
460 SET_FIELD_VOLATILE(obj, offset, jlong, x);
461 }
462 else {
463 Handle p (THREAD, JNIHandles::resolve(obj));
464 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
465 ObjectLocker ol(p, THREAD);
466 *addr = x;
467 }
468 }
469 #endif
470 UNSAFE_END
471
472 UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe))
473 UnsafeWrapper("Unsafe_LoadFence");
474 OrderAccess::acquire();
475 UNSAFE_END
476
477 UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe))
478 UnsafeWrapper("Unsafe_StoreFence");
479 OrderAccess::release();
480 UNSAFE_END
481
482 UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe))
483 UnsafeWrapper("Unsafe_FullFence");
484 OrderAccess::fence();
485 UNSAFE_END
486
487 ////// Data in the C heap.
488
489 // Note: These do not throw NullPointerException for bad pointers.
490 // They just crash. Only a oop base pointer can generate a NullPointerException.
491 //
492 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
493 \
494 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
495 UnsafeWrapper("Unsafe_GetNative"#Type); \
496 void* p = addr_from_java(addr); \
497 JavaThread* t = JavaThread::current(); \
498 t->set_doing_unsafe_access(true); \
499 java_type x = *(volatile native_type*)p; \
500 t->set_doing_unsafe_access(false); \
501 return x; \
502 UNSAFE_END \
503 \
504 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
505 UnsafeWrapper("Unsafe_SetNative"#Type); \
506 JavaThread* t = JavaThread::current(); \
507 t->set_doing_unsafe_access(true); \
508 void* p = addr_from_java(addr); \
509 *(volatile native_type*)p = x; \
510 t->set_doing_unsafe_access(false); \
511 UNSAFE_END \
512 \
513 // END DEFINE_GETSETNATIVE.
514
515 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
516 DEFINE_GETSETNATIVE(jshort, Short, signed short);
517 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
518 DEFINE_GETSETNATIVE(jint, Int, jint);
519 // no long -- handled specially
520 DEFINE_GETSETNATIVE(jfloat, Float, float);
521 DEFINE_GETSETNATIVE(jdouble, Double, double);
522
523 #undef DEFINE_GETSETNATIVE
524
525 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
526 UnsafeWrapper("Unsafe_GetNativeLong");
527 JavaThread* t = JavaThread::current();
528 // We do it this way to avoid problems with access to heap using 64
529 // bit loads, as jlong in heap could be not 64-bit aligned, and on
530 // some CPUs (SPARC) it leads to SIGBUS.
531 t->set_doing_unsafe_access(true);
532 void* p = addr_from_java(addr);
533 jlong x;
534 if (((intptr_t)p & 7) == 0) {
535 // jlong is aligned, do a volatile access
536 x = *(volatile jlong*)p;
537 } else {
538 jlong_accessor acc;
539 acc.words[0] = ((volatile jint*)p)[0];
540 acc.words[1] = ((volatile jint*)p)[1];
541 x = acc.long_value;
542 }
543 t->set_doing_unsafe_access(false);
544 return x;
545 UNSAFE_END
546
547 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
548 UnsafeWrapper("Unsafe_SetNativeLong");
549 JavaThread* t = JavaThread::current();
550 // see comment for Unsafe_GetNativeLong
551 t->set_doing_unsafe_access(true);
552 void* p = addr_from_java(addr);
553 if (((intptr_t)p & 7) == 0) {
554 // jlong is aligned, do a volatile access
555 *(volatile jlong*)p = x;
556 } else {
557 jlong_accessor acc;
558 acc.long_value = x;
559 ((volatile jint*)p)[0] = acc.words[0];
560 ((volatile jint*)p)[1] = acc.words[1];
561 }
562 t->set_doing_unsafe_access(false);
563 UNSAFE_END
564
565
566 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
567 UnsafeWrapper("Unsafe_GetNativeAddress");
568 void* p = addr_from_java(addr);
569 return addr_to_java(*(void**)p);
570 UNSAFE_END
571
572 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
573 UnsafeWrapper("Unsafe_SetNativeAddress");
574 void* p = addr_from_java(addr);
575 *(void**)p = addr_from_java(x);
576 UNSAFE_END
577
578
579 ////// Allocation requests
580
581 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
582 UnsafeWrapper("Unsafe_AllocateInstance");
583 {
584 ThreadToNativeFromVM ttnfv(thread);
585 return env->AllocObject(cls);
586 }
587 UNSAFE_END
588
589 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
590 UnsafeWrapper("Unsafe_AllocateMemory");
591 size_t sz = (size_t)size;
592 if (sz != (julong)size || size < 0) {
593 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
594 }
595 if (sz == 0) {
596 return 0;
597 }
598 sz = round_to(sz, HeapWordSize);
599 void* x = os::malloc(sz, mtInternal);
600 if (x == NULL) {
601 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
602 }
603 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
604 return addr_to_java(x);
605 UNSAFE_END
606
607 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
608 UnsafeWrapper("Unsafe_ReallocateMemory");
609 void* p = addr_from_java(addr);
610 size_t sz = (size_t)size;
611 if (sz != (julong)size || size < 0) {
612 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
613 }
614 if (sz == 0) {
615 os::free(p);
616 return 0;
617 }
618 sz = round_to(sz, HeapWordSize);
619 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal);
620 if (x == NULL) {
621 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
622 }
623 return addr_to_java(x);
624 UNSAFE_END
625
626 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
627 UnsafeWrapper("Unsafe_FreeMemory");
628 void* p = addr_from_java(addr);
629 if (p == NULL) {
630 return;
631 }
632 os::free(p);
633 UNSAFE_END
634
635 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
636 UnsafeWrapper("Unsafe_SetMemory");
637 size_t sz = (size_t)size;
638 if (sz != (julong)size || size < 0) {
639 THROW(vmSymbols::java_lang_IllegalArgumentException());
640 }
641 char* p = (char*) addr_from_java(addr);
642 Copy::fill_to_memory_atomic(p, sz, value);
643 UNSAFE_END
644
645 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
646 UnsafeWrapper("Unsafe_SetMemory");
647 size_t sz = (size_t)size;
648 if (sz != (julong)size || size < 0) {
649 THROW(vmSymbols::java_lang_IllegalArgumentException());
650 }
651 oop base = JNIHandles::resolve(obj);
652 void* p = index_oop_from_field_offset_long(base, offset);
653 Copy::fill_to_memory_atomic(p, sz, value);
654 UNSAFE_END
655
656 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
657 UnsafeWrapper("Unsafe_CopyMemory");
658 if (size == 0) {
659 return;
660 }
661 size_t sz = (size_t)size;
662 if (sz != (julong)size || size < 0) {
663 THROW(vmSymbols::java_lang_IllegalArgumentException());
664 }
665 void* src = addr_from_java(srcAddr);
666 void* dst = addr_from_java(dstAddr);
667 Copy::conjoint_memory_atomic(src, dst, sz);
668 UNSAFE_END
669
670 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
671 UnsafeWrapper("Unsafe_CopyMemory");
672 if (size == 0) {
673 return;
674 }
675 size_t sz = (size_t)size;
676 if (sz != (julong)size || size < 0) {
677 THROW(vmSymbols::java_lang_IllegalArgumentException());
678 }
679 oop srcp = JNIHandles::resolve(srcObj);
680 oop dstp = JNIHandles::resolve(dstObj);
681 if (dstp != NULL && !dstp->is_typeArray()) {
682 // NYI: This works only for non-oop arrays at present.
683 // Generalizing it would be reasonable, but requires card marking.
684 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
685 THROW(vmSymbols::java_lang_IllegalArgumentException());
686 }
687 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
688 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
689 Copy::conjoint_memory_atomic(src, dst, sz);
690 UNSAFE_END
691
692
693 ////// Random queries
694
695 // See comment at file start about UNSAFE_LEAF
696 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
697 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
698 UnsafeWrapper("Unsafe_AddressSize");
699 return sizeof(void*);
700 UNSAFE_END
701
702 // See comment at file start about UNSAFE_LEAF
703 //UNSAFE_LEAF(jint, Unsafe_PageSize())
704 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
705 UnsafeWrapper("Unsafe_PageSize");
706 return os::vm_page_size();
707 UNSAFE_END
708
709 UNSAFE_ENTRY(jboolean, Unsafe_ClmulAvailable(JNIEnv *env, jobject unsafe))
710 UnsafeWrapper("Unsafe_ClmulAvailable");
711 return UseAVX && UseCLMUL;
712 UNSAFE_END
713
714 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
715 if (field == NULL) {
716 THROW_0(vmSymbols::java_lang_NullPointerException());
717 }
718
719 oop reflected = JNIHandles::resolve_non_null(field);
720 oop mirror = java_lang_reflect_Field::clazz(reflected);
721 Klass* k = java_lang_Class::as_Klass(mirror);
722 int slot = java_lang_reflect_Field::slot(reflected);
723 int modifiers = java_lang_reflect_Field::modifiers(reflected);
724
725 if (must_be_static >= 0) {
726 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
727 if (must_be_static != really_is_static) {
728 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
729 }
730 }
731
732 int offset = InstanceKlass::cast(k)->field_offset(slot);
733 return field_offset_from_byte_offset(offset);
734 }
735
736 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
737 UnsafeWrapper("Unsafe_ObjectFieldOffset");
738 return find_field_offset(field, 0, THREAD);
739 UNSAFE_END
740
741 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
742 UnsafeWrapper("Unsafe_StaticFieldOffset");
743 return find_field_offset(field, 1, THREAD);
744 UNSAFE_END
745
746 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
747 UnsafeWrapper("Unsafe_StaticFieldBase");
748 // Note: In this VM implementation, a field address is always a short
749 // offset from the base of a a klass metaobject. Thus, the full dynamic
750 // range of the return type is never used. However, some implementations
751 // might put the static field inside an array shared by many classes,
752 // or even at a fixed address, in which case the address could be quite
753 // large. In that last case, this function would return NULL, since
754 // the address would operate alone, without any base pointer.
755
756 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
757
758 oop reflected = JNIHandles::resolve_non_null(field);
759 oop mirror = java_lang_reflect_Field::clazz(reflected);
760 int modifiers = java_lang_reflect_Field::modifiers(reflected);
761
762 if ((modifiers & JVM_ACC_STATIC) == 0) {
763 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
764 }
765
766 return JNIHandles::make_local(env, mirror);
767 UNSAFE_END
768
769 //@deprecated
770 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
771 UnsafeWrapper("Unsafe_FieldOffset");
772 // tries (but fails) to be polymorphic between static and non-static:
773 jlong offset = find_field_offset(field, -1, THREAD);
774 guarantee(offset == (jint)offset, "offset fits in 32 bits");
775 return (jint)offset;
776 UNSAFE_END
777
778 //@deprecated
779 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
780 UnsafeWrapper("Unsafe_StaticFieldBase");
781 if (clazz == NULL) {
782 THROW_0(vmSymbols::java_lang_NullPointerException());
783 }
784 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
785 UNSAFE_END
786
787 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
788 UnsafeWrapper("Unsafe_EnsureClassInitialized");
789 if (clazz == NULL) {
790 THROW(vmSymbols::java_lang_NullPointerException());
791 }
792 oop mirror = JNIHandles::resolve_non_null(clazz);
793
794 Klass* klass = java_lang_Class::as_Klass(mirror);
795 if (klass != NULL && klass->should_be_initialized()) {
796 InstanceKlass* k = InstanceKlass::cast(klass);
797 k->initialize(CHECK);
798 }
799 }
800 UNSAFE_END
801
802 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
803 UnsafeWrapper("Unsafe_ShouldBeInitialized");
804 if (clazz == NULL) {
805 THROW_(vmSymbols::java_lang_NullPointerException(), false);
806 }
807 oop mirror = JNIHandles::resolve_non_null(clazz);
808 Klass* klass = java_lang_Class::as_Klass(mirror);
809 if (klass != NULL && klass->should_be_initialized()) {
810 return true;
811 }
812 return false;
813 }
814 UNSAFE_END
815
816 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
817 if (acls == NULL) {
818 THROW(vmSymbols::java_lang_NullPointerException());
819 }
820 oop mirror = JNIHandles::resolve_non_null(acls);
821 Klass* k = java_lang_Class::as_Klass(mirror);
822 if (k == NULL || !k->oop_is_array()) {
823 THROW(vmSymbols::java_lang_InvalidClassException());
824 } else if (k->oop_is_objArray()) {
825 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
826 scale = heapOopSize;
827 } else if (k->oop_is_typeArray()) {
828 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
829 base = tak->array_header_in_bytes();
830 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
831 scale = (1 << tak->log2_element_size());
832 } else {
833 ShouldNotReachHere();
834 }
835 }
836
837 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
838 UnsafeWrapper("Unsafe_ArrayBaseOffset");
839 int base, scale;
840 getBaseAndScale(base, scale, acls, CHECK_0);
841 return field_offset_from_byte_offset(base);
842 UNSAFE_END
843
844
845 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
846 UnsafeWrapper("Unsafe_ArrayIndexScale");
847 int base, scale;
848 getBaseAndScale(base, scale, acls, CHECK_0);
849 // This VM packs both fields and array elements down to the byte.
850 // But watch out: If this changes, so that array references for
851 // a given primitive type (say, T_BOOLEAN) use different memory units
852 // than fields, this method MUST return zero for such arrays.
853 // For example, the VM used to store sub-word sized fields in full
854 // words in the object layout, so that accessors like getByte(Object,int)
855 // did not really do what one might expect for arrays. Therefore,
856 // this function used to report a zero scale factor, so that the user
857 // would know not to attempt to access sub-word array elements.
858 // // Code for unpacked fields:
859 // if (scale < wordSize) return 0;
860
861 // The following allows for a pretty general fieldOffset cookie scheme,
862 // but requires it to be linear in byte offset.
863 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
864 UNSAFE_END
865
866
867 static inline void throw_new(JNIEnv *env, const char *ename) {
868 char buf[100];
869 strcpy(buf, "java/lang/");
870 strcat(buf, ename);
871 jclass cls = env->FindClass(buf);
872 char* msg = NULL;
873 env->ThrowNew(cls, msg);
874 }
875
876 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
877 {
878 // Code lifted from JDK 1.3 ClassLoader.c
879
880 jbyte *body;
881 char *utfName;
882 jclass result = 0;
883 char buf[128];
884
885 if (UsePerfData) {
886 ClassLoader::unsafe_defineClassCallCounter()->inc();
887 }
888
889 if (data == NULL) {
890 throw_new(env, "NullPointerException");
891 return 0;
892 }
893
894 /* Work around 4153825. malloc crashes on Solaris when passed a
895 * negative size.
896 */
897 if (length < 0) {
898 throw_new(env, "ArrayIndexOutOfBoundsException");
899 return 0;
900 }
901
902 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
903
904 if (body == 0) {
905 throw_new(env, "OutOfMemoryError");
906 return 0;
907 }
908
909 env->GetByteArrayRegion(data, offset, length, body);
910
911 if (env->ExceptionOccurred())
912 goto free_body;
913
914 if (name != NULL) {
915 uint len = env->GetStringUTFLength(name);
916 int unicode_len = env->GetStringLength(name);
917 if (len >= sizeof(buf)) {
918 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
919 if (utfName == NULL) {
920 throw_new(env, "OutOfMemoryError");
921 goto free_body;
922 }
923 } else {
924 utfName = buf;
925 }
926 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
927 //VerifyFixClassname(utfName);
928 for (uint i = 0; i < len; i++) {
929 if (utfName[i] == '.') utfName[i] = '/';
930 }
931 } else {
932 utfName = NULL;
933 }
934
935 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
936
937 if (utfName && utfName != buf)
938 FREE_C_HEAP_ARRAY(char, utfName, mtInternal);
939
940 free_body:
941 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal);
942 return result;
943 }
944 }
945
946
947 UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
948 UnsafeWrapper("Unsafe_DefineClass");
949 {
950 ThreadToNativeFromVM ttnfv(thread);
951 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
952 }
953 UNSAFE_END
954
955
956 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
957 UnsafeWrapper("Unsafe_DefineClass");
958 {
959 ThreadToNativeFromVM ttnfv(thread);
960
961 int depthFromDefineClass0 = 1;
962 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
963 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
964 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
965
966 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
967 }
968 UNSAFE_END
969
970
971 #define DAC_Args CLS"[B["OBJ
972 // define a class but do not make it known to the class loader or system dictionary
973 // - host_class: supplies context for linkage, access control, protection domain, and class loader
974 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
975 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
976
977 // When you load an anonymous class U, it works as if you changed its name just before loading,
978 // to a name that you will never use again. Since the name is lost, no other class can directly
979 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
980 // through java.lang.Class methods like Class.newInstance.
981
982 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
983 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
984 // An anonymous class also has special privileges to access any member of its host class.
985 // This is the main reason why this loading operation is unsafe. The purpose of this is to
986 // allow language implementations to simulate "open classes"; a host class in effect gets
987 // new code when an anonymous class is loaded alongside it. A less convenient but more
988 // standard way to do this is with reflection, which can also be set to ignore access
989 // restrictions.
990
991 // Access into an anonymous class is possible only through reflection. Therefore, there
992 // are no special access rules for calling into an anonymous class. The relaxed access
993 // rule for the host class is applied in the opposite direction: A host class reflectively
994 // access one of its anonymous classes.
995
996 // If you load the same bytecodes twice, you get two different classes. You can reload
997 // the same bytecodes with or without varying CP patches.
998
999 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
1000 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
1001 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
1002
1003 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
1004 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
1005 // It is not possible for a named class, or an older anonymous class, to refer by
1006 // name (via its CP) to a newer anonymous class.
1007
1008 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
1009 // or type descriptors used in the loaded anonymous class.
1010
1011 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
1012 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
1013 // be changed to println(greeting), where greeting is an arbitrary object created before
1014 // the anonymous class is loaded. This is useful in dynamic languages, in which
1015 // various kinds of metaobjects must be introduced as constants into bytecode.
1016 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
1017 // not just a literal string. For such ldc instructions, the verifier uses the
1018 // type Object instead of String, if the loaded constant is not in fact a String.
1019
1020 static instanceKlassHandle
1021 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
1022 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
1023 HeapWord* *temp_alloc,
1024 TRAPS) {
1025
1026 if (UsePerfData) {
1027 ClassLoader::unsafe_defineClassCallCounter()->inc();
1028 }
1029
1030 if (data == NULL) {
1031 THROW_0(vmSymbols::java_lang_NullPointerException());
1032 }
1033
1034 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
1035 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
1036 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal);
1037 if (body == NULL) {
1038 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1039 }
1040
1041 // caller responsible to free it:
1042 (*temp_alloc) = body;
1043
1044 {
1045 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1046 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1047 }
1048
1049 u1* class_bytes = (u1*) body;
1050 int class_bytes_length = (int) length;
1051 if (class_bytes_length < 0) class_bytes_length = 0;
1052 if (class_bytes == NULL
1053 || host_class == NULL
1054 || length != class_bytes_length)
1055 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1056
1057 objArrayHandle cp_patches_h;
1058 if (cp_patches_jh != NULL) {
1059 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1060 if (!p->is_objArray())
1061 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1062 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1063 }
1064
1065 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class)));
1066 const char* host_source = host_klass->external_name();
1067 Handle host_loader(THREAD, host_klass->class_loader());
1068 Handle host_domain(THREAD, host_klass->protection_domain());
1069
1070 GrowableArray<Handle>* cp_patches = NULL;
1071 if (cp_patches_h.not_null()) {
1072 int alen = cp_patches_h->length();
1073 for (int i = alen-1; i >= 0; i--) {
1074 oop p = cp_patches_h->obj_at(i);
1075 if (p != NULL) {
1076 Handle patch(THREAD, p);
1077 if (cp_patches == NULL)
1078 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1079 cp_patches->at_put(i, patch);
1080 }
1081 }
1082 }
1083
1084 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1085
1086 instanceKlassHandle anon_klass;
1087 {
1088 Symbol* no_class_name = NULL;
1089 Klass* anonk = SystemDictionary::parse_stream(no_class_name,
1090 host_loader, host_domain,
1091 &st, host_klass, cp_patches,
1092 CHECK_NULL);
1093 if (anonk == NULL) return NULL;
1094 anon_klass = instanceKlassHandle(THREAD, anonk);
1095 }
1096
1097 return anon_klass;
1098 }
1099
1100 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1101 {
1102 instanceKlassHandle anon_klass;
1103 jobject res_jh = NULL;
1104
1105 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1106 ResourceMark rm(THREAD);
1107
1108 HeapWord* temp_alloc = NULL;
1109
1110 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data,
1111 cp_patches_jh,
1112 &temp_alloc, THREAD);
1113 if (anon_klass() != NULL)
1114 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
1115
1116 // try/finally clause:
1117 if (temp_alloc != NULL) {
1118 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal);
1119 }
1120
1121 // The anonymous class loader data has been artificially been kept alive to
1122 // this point. The mirror and any instances of this class have to keep
1123 // it alive afterwards.
1124 if (anon_klass() != NULL) {
1125 anon_klass->class_loader_data()->set_keep_alive(false);
1126 }
1127
1128 // let caller initialize it as needed...
1129
1130 return (jclass) res_jh;
1131 }
1132 UNSAFE_END
1133
1134
1135
1136 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1137 UnsafeWrapper("Unsafe_MonitorEnter");
1138 {
1139 if (jobj == NULL) {
1140 THROW(vmSymbols::java_lang_NullPointerException());
1141 }
1142 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1143 ObjectSynchronizer::jni_enter(obj, CHECK);
1144 }
1145 UNSAFE_END
1146
1147
1148 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1149 UnsafeWrapper("Unsafe_TryMonitorEnter");
1150 {
1151 if (jobj == NULL) {
1152 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1153 }
1154 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1155 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1156 return (res ? JNI_TRUE : JNI_FALSE);
1157 }
1158 UNSAFE_END
1159
1160
1161 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1162 UnsafeWrapper("Unsafe_MonitorExit");
1163 {
1164 if (jobj == NULL) {
1165 THROW(vmSymbols::java_lang_NullPointerException());
1166 }
1167 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1168 ObjectSynchronizer::jni_exit(obj(), CHECK);
1169 }
1170 UNSAFE_END
1171
1172
1173 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1174 UnsafeWrapper("Unsafe_ThrowException");
1175 {
1176 ThreadToNativeFromVM ttnfv(thread);
1177 env->Throw(thr);
1178 }
1179 UNSAFE_END
1180
1181 // JSR166 ------------------------------------------------------------------
1182
1183 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1184 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1185 oop x = JNIHandles::resolve(x_h);
1186 oop e = JNIHandles::resolve(e_h);
1187 oop p = JNIHandles::resolve(obj);
1188 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1189 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
1190 jboolean success = (res == e);
1191 if (success)
1192 update_barrier_set((void*)addr, x);
1193 return success;
1194 UNSAFE_END
1195
1196 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1197 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1198 oop p = JNIHandles::resolve(obj);
1199 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1200 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1201 UNSAFE_END
1202
1203 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1204 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1205 Handle p (THREAD, JNIHandles::resolve(obj));
1206 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1207 if (VM_Version::supports_cx8())
1208 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1209 else {
1210 jboolean success = false;
1211 ObjectLocker ol(p, THREAD);
1212 if (*addr == e) { *addr = x; success = true; }
1213 return success;
1214 }
1215 UNSAFE_END
1216
1217 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1218 UnsafeWrapper("Unsafe_Park");
1219 #ifndef USDT2
1220 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1221 #else /* USDT2 */
1222 HOTSPOT_THREAD_PARK_BEGIN(
1223 (uintptr_t) thread->parker(), (int) isAbsolute, time);
1224 #endif /* USDT2 */
1225 JavaThreadParkedState jtps(thread, time != 0);
1226 thread->parker()->park(isAbsolute != 0, time);
1227 #ifndef USDT2
1228 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1229 #else /* USDT2 */
1230 HOTSPOT_THREAD_PARK_END(
1231 (uintptr_t) thread->parker());
1232 #endif /* USDT2 */
1233 UNSAFE_END
1234
1235 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1236 UnsafeWrapper("Unsafe_Unpark");
1237 Parker* p = NULL;
1238 if (jthread != NULL) {
1239 oop java_thread = JNIHandles::resolve_non_null(jthread);
1240 if (java_thread != NULL) {
1241 jlong lp = java_lang_Thread::park_event(java_thread);
1242 if (lp != 0) {
1243 // This cast is OK even though the jlong might have been read
1244 // non-atomically on 32bit systems, since there, one word will
1245 // always be zero anyway and the value set is always the same
1246 p = (Parker*)addr_from_java(lp);
1247 } else {
1248 // Grab lock if apparently null or using older version of library
1249 MutexLocker mu(Threads_lock);
1250 java_thread = JNIHandles::resolve_non_null(jthread);
1251 if (java_thread != NULL) {
1252 JavaThread* thr = java_lang_Thread::thread(java_thread);
1253 if (thr != NULL) {
1254 p = thr->parker();
1255 if (p != NULL) { // Bind to Java thread for next time.
1256 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1257 }
1258 }
1259 }
1260 }
1261 }
1262 }
1263 if (p != NULL) {
1264 #ifndef USDT2
1265 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1266 #else /* USDT2 */
1267 HOTSPOT_THREAD_UNPARK(
1268 (uintptr_t) p);
1269 #endif /* USDT2 */
1270 p->unpark();
1271 }
1272 UNSAFE_END
1273
1274 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1275 UnsafeWrapper("Unsafe_Loadavg");
1276 const int max_nelem = 3;
1277 double la[max_nelem];
1278 jint ret;
1279
1280 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1281 assert(a->is_typeArray(), "must be type array");
1282
1283 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1284 ThreadToNativeFromVM ttnfv(thread);
1285 throw_new(env, "ArrayIndexOutOfBoundsException");
1286 return -1;
1287 }
1288
1289 ret = os::loadavg(la, nelem);
1290 if (ret == -1) return -1;
1291
1292 // if successful, ret is the number of samples actually retrieved.
1293 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1294 switch(ret) {
1295 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1296 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1297 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1298 }
1299 return ret;
1300 UNSAFE_END
1301
1302 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1303 UnsafeWrapper("Unsafe_PrefetchRead");
1304 oop p = JNIHandles::resolve(obj);
1305 void* addr = index_oop_from_field_offset_long(p, 0);
1306 Prefetch::read(addr, (intx)offset);
1307 UNSAFE_END
1308
1309 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1310 UnsafeWrapper("Unsafe_PrefetchWrite");
1311 oop p = JNIHandles::resolve(obj);
1312 void* addr = index_oop_from_field_offset_long(p, 0);
1313 Prefetch::write(addr, (intx)offset);
1314 UNSAFE_END
1315
1316
1317 /// JVM_RegisterUnsafeMethods
1318
1319 #define ADR "J"
1320
1321 #define LANG "Ljava/lang/"
1322
1323 #define OBJ LANG"Object;"
1324 #define CLS LANG"Class;"
1325 #define CTR LANG"reflect/Constructor;"
1326 #define FLD LANG"reflect/Field;"
1327 #define MTH LANG"reflect/Method;"
1328 #define THR LANG"Throwable;"
1329
1330 #define DC0_Args LANG"String;[BII"
1331 #define DC_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1332
1333 #define CC (char*) /*cast a literal from (const char*)*/
1334 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1335
1336 // define deprecated accessors for compabitility with 1.4.0
1337 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1338 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1339 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1340
1341 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1342 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1343 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1344 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1345
1346 // Note: In 1.5.0, there are volatile versions too
1347 #define DECLARE_GETSETOOP(Boolean, Z) \
1348 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1349 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1350 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1351 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1352
1353
1354 #define DECLARE_GETSETNATIVE(Byte, B) \
1355 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1356 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1357
1358
1359
1360 // These are the methods for 1.4.0
1361 static JNINativeMethod methods_140[] = {
1362 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)},
1363 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)},
1364
1365 DECLARE_GETSETOOP_140(Boolean, Z),
1366 DECLARE_GETSETOOP_140(Byte, B),
1367 DECLARE_GETSETOOP_140(Short, S),
1368 DECLARE_GETSETOOP_140(Char, C),
1369 DECLARE_GETSETOOP_140(Int, I),
1370 DECLARE_GETSETOOP_140(Long, J),
1371 DECLARE_GETSETOOP_140(Float, F),
1372 DECLARE_GETSETOOP_140(Double, D),
1373
1374 DECLARE_GETSETNATIVE(Byte, B),
1375 DECLARE_GETSETNATIVE(Short, S),
1376 DECLARE_GETSETNATIVE(Char, C),
1377 DECLARE_GETSETNATIVE(Int, I),
1378 DECLARE_GETSETNATIVE(Long, J),
1379 DECLARE_GETSETNATIVE(Float, F),
1380 DECLARE_GETSETNATIVE(Double, D),
1381
1382 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1383 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1384
1385 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1386 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1387 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1388
1389 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)},
1390 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)},
1391 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1392 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1393 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1394 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1395 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1396
1397 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1398 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1399 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1400 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1401 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1402 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1403 };
1404
1405 // These are the methods prior to the JSR 166 changes in 1.5.0
1406 static JNINativeMethod methods_141[] = {
1407 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1408 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1409
1410 DECLARE_GETSETOOP_141(Boolean, Z),
1411 DECLARE_GETSETOOP_141(Byte, B),
1412 DECLARE_GETSETOOP_141(Short, S),
1413 DECLARE_GETSETOOP_141(Char, C),
1414 DECLARE_GETSETOOP_141(Int, I),
1415 DECLARE_GETSETOOP_141(Long, J),
1416 DECLARE_GETSETOOP_141(Float, F),
1417 DECLARE_GETSETOOP_141(Double, D),
1418
1419 DECLARE_GETSETNATIVE(Byte, B),
1420 DECLARE_GETSETNATIVE(Short, S),
1421 DECLARE_GETSETNATIVE(Char, C),
1422 DECLARE_GETSETNATIVE(Int, I),
1423 DECLARE_GETSETNATIVE(Long, J),
1424 DECLARE_GETSETNATIVE(Float, F),
1425 DECLARE_GETSETNATIVE(Double, D),
1426
1427 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1428 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1429
1430 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1431 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1432 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1433
1434 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1435 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1436 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1437 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1438 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1439 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1440 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1441 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1442
1443 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1444 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1445 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1446 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1447 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1448 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1449
1450 };
1451
1452 // These are the methods prior to the JSR 166 changes in 1.6.0
1453 static JNINativeMethod methods_15[] = {
1454 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1455 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1456 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1457 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1458
1459
1460 DECLARE_GETSETOOP(Boolean, Z),
1461 DECLARE_GETSETOOP(Byte, B),
1462 DECLARE_GETSETOOP(Short, S),
1463 DECLARE_GETSETOOP(Char, C),
1464 DECLARE_GETSETOOP(Int, I),
1465 DECLARE_GETSETOOP(Long, J),
1466 DECLARE_GETSETOOP(Float, F),
1467 DECLARE_GETSETOOP(Double, D),
1468
1469 DECLARE_GETSETNATIVE(Byte, B),
1470 DECLARE_GETSETNATIVE(Short, S),
1471 DECLARE_GETSETNATIVE(Char, C),
1472 DECLARE_GETSETNATIVE(Int, I),
1473 DECLARE_GETSETNATIVE(Long, J),
1474 DECLARE_GETSETNATIVE(Float, F),
1475 DECLARE_GETSETNATIVE(Double, D),
1476
1477 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1478 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1479
1480 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1481 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1482 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1483
1484 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1485 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1486 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1487 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1488 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1489 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1490 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1491 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1492
1493 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1494 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1495 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1496 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1497 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1498 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1499 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1500 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1501 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1502 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1503 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1504
1505 };
1506
1507 // These are the methods for 1.6.0 and 1.7.0
1508 static JNINativeMethod methods_16[] = {
1509 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1510 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1511 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1512 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1513
1514 DECLARE_GETSETOOP(Boolean, Z),
1515 DECLARE_GETSETOOP(Byte, B),
1516 DECLARE_GETSETOOP(Short, S),
1517 DECLARE_GETSETOOP(Char, C),
1518 DECLARE_GETSETOOP(Int, I),
1519 DECLARE_GETSETOOP(Long, J),
1520 DECLARE_GETSETOOP(Float, F),
1521 DECLARE_GETSETOOP(Double, D),
1522
1523 DECLARE_GETSETNATIVE(Byte, B),
1524 DECLARE_GETSETNATIVE(Short, S),
1525 DECLARE_GETSETNATIVE(Char, C),
1526 DECLARE_GETSETNATIVE(Int, I),
1527 DECLARE_GETSETNATIVE(Long, J),
1528 DECLARE_GETSETNATIVE(Float, F),
1529 DECLARE_GETSETNATIVE(Double, D),
1530
1531 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1532 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1533
1534 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1535 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1536 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1537
1538 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1539 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1540 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1541 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1542 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1543 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1544 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1545 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1546
1547 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1548 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1549 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1550 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1551 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1552 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1553 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1554 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1555 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1556 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1557 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1558 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1559 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1560 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1561 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1562 };
1563
1564 // These are the methods for 1.8.0
1565 static JNINativeMethod methods_18[] = {
1566 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1567 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1568 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1569 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1570
1571 DECLARE_GETSETOOP(Boolean, Z),
1572 DECLARE_GETSETOOP(Byte, B),
1573 DECLARE_GETSETOOP(Short, S),
1574 DECLARE_GETSETOOP(Char, C),
1575 DECLARE_GETSETOOP(Int, I),
1576 DECLARE_GETSETOOP(Long, J),
1577 DECLARE_GETSETOOP(Float, F),
1578 DECLARE_GETSETOOP(Double, D),
1579
1580 DECLARE_GETSETNATIVE(Byte, B),
1581 DECLARE_GETSETNATIVE(Short, S),
1582 DECLARE_GETSETNATIVE(Char, C),
1583 DECLARE_GETSETNATIVE(Int, I),
1584 DECLARE_GETSETNATIVE(Long, J),
1585 DECLARE_GETSETNATIVE(Float, F),
1586 DECLARE_GETSETNATIVE(Double, D),
1587
1588 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1589 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1590
1591 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1592 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1593 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1594
1595 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1596 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1597 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1598 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1599 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1600 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1601 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1602 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1603
1604 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1605 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1606 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1607 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1608 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1609 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1610 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1611 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1612 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1613 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1614 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1615 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1616 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1617 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)},
1618 {CC"clmulAvailable", CC"()Z", FN_PTR(Unsafe_ClmulAvailable)},
1619
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