1 /*
2 * Copyright (c) 2000, 2011, 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 "memory/allocation.inline.hpp"
28 #include "prims/jni.h"
29 #include "prims/jvm.h"
30 #include "runtime/globals.hpp"
31 #include "runtime/interfaceSupport.hpp"
32 #include "runtime/reflection.hpp"
33 #include "runtime/reflectionCompat.hpp"
34 #include "runtime/synchronizer.hpp"
35 #include "services/threadService.hpp"
36 #include "utilities/copy.hpp"
37 #include "utilities/dtrace.hpp"
38
39 /*
40 * Implementation of class sun.misc.Unsafe
41 */
42
43 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long);
44 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t);
45 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t);
46
47 #define MAX_OBJECT_SIZE \
48 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
49 + ((julong)max_jint * sizeof(double)) )
50
51
52 #define UNSAFE_ENTRY(result_type, header) \
53 JVM_ENTRY(result_type, header)
54
55 // Can't use UNSAFE_LEAF because it has the signature of a straight
56 // call into the runtime (just like JVM_LEAF, funny that) but it's
57 // called like a Java Native and thus the wrapper built for it passes
58 // arguments like a JNI call. It expects those arguments to be popped
59 // from the stack on Intel like all good JNI args are, and adjusts the
60 // stack according. Since the JVM_LEAF call expects no extra
61 // arguments the stack isn't popped in the C code, is pushed by the
62 // wrapper and we get sick.
63 //#define UNSAFE_LEAF(result_type, header) \
64 // JVM_LEAF(result_type, header)
65
66 #define UNSAFE_END JVM_END
67
68 #define UnsafeWrapper(arg) /*nothing, for the present*/
69
70
71 inline void* addr_from_java(jlong addr) {
72 // This assert fails in a variety of ways on 32-bit systems.
73 // It is impossible to predict whether native code that converts
74 // pointers to longs will sign-extend or zero-extend the addresses.
75 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
76 return (void*)(uintptr_t)addr;
77 }
78
79 inline jlong addr_to_java(void* p) {
80 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
81 return (uintptr_t)p;
82 }
83
84
85 // Note: The VM's obj_field and related accessors use byte-scaled
86 // ("unscaled") offsets, just as the unsafe methods do.
87
88 // However, the method Unsafe.fieldOffset explicitly declines to
89 // guarantee this. The field offset values manipulated by the Java user
90 // through the Unsafe API are opaque cookies that just happen to be byte
91 // offsets. We represent this state of affairs by passing the cookies
92 // through conversion functions when going between the VM and the Unsafe API.
93 // The conversion functions just happen to be no-ops at present.
94
95 inline jlong field_offset_to_byte_offset(jlong field_offset) {
96 return field_offset;
97 }
98
99 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
100 return byte_offset;
101 }
102
103 inline jint invocation_key_from_method_slot(jint slot) {
104 return slot;
105 }
106
107 inline jint invocation_key_to_method_slot(jint key) {
108 return key;
109 }
110
111 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
112 jlong byte_offset = field_offset_to_byte_offset(field_offset);
113 // Don't allow unsafe to be used to read or write the header word of oops
114 assert(p == NULL || field_offset >= oopDesc::header_size(), "offset must be outside of header");
115 #ifdef ASSERT
116 if (p != NULL) {
117 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
118 if (byte_offset == (jint)byte_offset) {
119 void* ptr_plus_disp = (address)p + byte_offset;
120 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
121 "raw [ptr+disp] must be consistent with oop::field_base");
122 }
123 }
124 #endif
125 if (sizeof(char*) == sizeof(jint)) // (this constant folds!)
126 return (address)p + (jint) byte_offset;
127 else
128 return (address)p + byte_offset;
129 }
130
131 // Externally callable versions:
132 // (Use these in compiler intrinsics which emulate unsafe primitives.)
133 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
134 return field_offset;
135 }
136 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
137 return byte_offset;
138 }
139 jint Unsafe_invocation_key_from_method_slot(jint slot) {
140 return invocation_key_from_method_slot(slot);
141 }
142 jint Unsafe_invocation_key_to_method_slot(jint key) {
143 return invocation_key_to_method_slot(key);
144 }
145
146
147 ///// Data in the Java heap.
148
149 #define GET_FIELD(obj, offset, type_name, v) \
150 oop p = JNIHandles::resolve(obj); \
151 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
152
153 #define SET_FIELD(obj, offset, type_name, x) \
154 oop p = JNIHandles::resolve(obj); \
155 *(type_name*)index_oop_from_field_offset_long(p, offset) = x
156
157 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
158 oop p = JNIHandles::resolve(obj); \
159 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
160
161 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
162 oop p = JNIHandles::resolve(obj); \
163 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x);
164
165 // Macros for oops that check UseCompressedOops
166
167 #define GET_OOP_FIELD(obj, offset, v) \
168 oop p = JNIHandles::resolve(obj); \
169 oop v; \
170 if (UseCompressedOops) { \
171 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
172 v = oopDesc::decode_heap_oop(n); \
173 } else { \
174 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
175 }
176
177 #define GET_OOP_FIELD_VOLATILE(obj, offset, v) \
178 oop p = JNIHandles::resolve(obj); \
179 volatile oop v; \
180 if (UseCompressedOops) { \
181 volatile narrowOop n = *(volatile narrowOop*)index_oop_from_field_offset_long(p, offset); \
182 v = oopDesc::decode_heap_oop(n); \
183 } else { \
184 v = *(volatile oop*)index_oop_from_field_offset_long(p, offset); \
185 } \
186 OrderAccess::acquire();
187
188
189 // Get/SetObject must be special-cased, since it works with handles.
190
191 // The xxx140 variants for backward compatibility do not allow a full-width offset.
192 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
193 UnsafeWrapper("Unsafe_GetObject");
194 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
195 GET_OOP_FIELD(obj, offset, v)
196 jobject ret = JNIHandles::make_local(env, v);
197 #ifndef SERIALGC
198 // We could be accessing the the referent field in a reference
199 // object. If G1 is enabled then we need to register the
200 // referent with the SATB barrier.
201 if (UseG1GC) {
202 bool needs_barrier = false;
203 oop o = JNIHandles::resolve_non_null(obj);
204
205 if (offset == java_lang_ref_Reference::referent_offset) {
206 klassOop k = o->klass();
207 if (instanceKlass::cast(k)->reference_type() != REF_NONE) {
208 assert(instanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
209 needs_barrier = true;
210 }
211 }
212
213 if (needs_barrier) {
214 BarrierSet* bs = Universe::heap()->barrier_set();
215 if (UseCompressedOops) {
216 bs->write_ref_field_pre((narrowOop*)index_oop_from_field_offset_long(o, offset),
217 JNIHandles::resolve(ret));
218 } else {
219 bs->write_ref_field_pre((oop*)index_oop_from_field_offset_long(o, offset),
220 JNIHandles::resolve(ret));
221 }
222 }
223 }
224 #endif // SERIALGC
225 return ret;
226 UNSAFE_END
227
228 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
229 UnsafeWrapper("Unsafe_SetObject");
230 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
231 oop x = JNIHandles::resolve(x_h);
232 //SET_FIELD(obj, offset, oop, x);
233 oop p = JNIHandles::resolve(obj);
234 if (UseCompressedOops) {
235 if (x != NULL) {
236 // If there is a heap base pointer, we are obliged to emit a store barrier.
237 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
238 } else {
239 narrowOop n = oopDesc::encode_heap_oop_not_null(x);
240 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
241 }
242 } else {
243 if (x != NULL) {
244 // If there is a heap base pointer, we are obliged to emit a store barrier.
245 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
246 } else {
247 *(oop*)index_oop_from_field_offset_long(p, offset) = x;
248 }
249 }
250 UNSAFE_END
251
252 // The normal variants allow a null base pointer with an arbitrary address.
253 // But if the base pointer is non-null, the offset should make some sense.
254 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
255 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
256 UnsafeWrapper("Unsafe_GetObject");
257 tty->print_cr("####### Unsafe_GetObject: offset = " INTX_FORMAT, offset);
258 GET_OOP_FIELD(obj, offset, v)
259 jobject ret = JNIHandles::make_local(env, v);
260 #ifndef SERIALGC
261 // We could be accessing the referent field in a reference
262 // object. If G1 is enabled then we need to register the
263 // referent with the SATB barrier.
264 if (UseG1GC) {
265 bool needs_barrier = false;
266 oop o = JNIHandles::resolve(obj);
267
268 if (offset == java_lang_ref_Reference::referent_offset && o != NULL) {
269 klassOop k = o->klass();
270 if (instanceKlass::cast(k)->reference_type() != REF_NONE) {
271 assert(instanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity"); tty->print_cr("####### Unsafe_GetObject: need a G1 barrier");
272 needs_barrier = true;
273 }
274 }
275
276 if (needs_barrier) {
277 BarrierSet* bs = Universe::heap()->barrier_set();
278 if (UseCompressedOops) {
279 bs->write_ref_field_pre((narrowOop*)index_oop_from_field_offset_long(o, offset),
280 JNIHandles::resolve(ret));
281 } else {
282 bs->write_ref_field_pre((oop*)index_oop_from_field_offset_long(o, offset),
283 JNIHandles::resolve(ret));
284 }
285 }
286 }
287 #endif // SERIALGC
288 return ret;
289 UNSAFE_END
290
291 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
292 UnsafeWrapper("Unsafe_SetObject");
293 oop x = JNIHandles::resolve(x_h);
294 oop p = JNIHandles::resolve(obj);
295 if (UseCompressedOops) {
296 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
297 } else {
298 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
299 }
300 UNSAFE_END
301
302 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
303 UnsafeWrapper("Unsafe_GetObjectVolatile");
304 GET_OOP_FIELD_VOLATILE(obj, offset, v)
305 return JNIHandles::make_local(env, v);
306 UNSAFE_END
307
308 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
309 UnsafeWrapper("Unsafe_SetObjectVolatile");
310 oop x = JNIHandles::resolve(x_h);
311 oop p = JNIHandles::resolve(obj);
312 void* addr = index_oop_from_field_offset_long(p, offset);
313 OrderAccess::release();
314 if (UseCompressedOops) {
315 oop_store((narrowOop*)addr, x);
316 } else {
317 oop_store((oop*)addr, x);
318 }
319 OrderAccess::fence();
320 UNSAFE_END
321
322 #if defined(SPARC) || defined(X86)
323 // Sparc and X86 have atomic jlong (8 bytes) instructions
324
325 #else
326 // Keep old code for platforms which may not have atomic jlong (8 bytes) instructions
327
328 // Volatile long versions must use locks if !VM_Version::supports_cx8().
329 // support_cx8 is a surrogate for 'supports atomic long memory ops'.
330
331 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
332 UnsafeWrapper("Unsafe_GetLongVolatile");
333 {
334 if (VM_Version::supports_cx8()) {
335 GET_FIELD_VOLATILE(obj, offset, jlong, v);
336 return v;
337 }
338 else {
339 Handle p (THREAD, JNIHandles::resolve(obj));
340 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
341 ObjectLocker ol(p, THREAD);
342 jlong value = *addr;
343 return value;
344 }
345 }
346 UNSAFE_END
347
348 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
349 UnsafeWrapper("Unsafe_SetLongVolatile");
350 {
351 if (VM_Version::supports_cx8()) {
352 SET_FIELD_VOLATILE(obj, offset, jlong, x);
353 }
354 else {
355 Handle p (THREAD, JNIHandles::resolve(obj));
356 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
357 ObjectLocker ol(p, THREAD);
358 *addr = x;
359 }
360 }
361 UNSAFE_END
362
363 #endif // not SPARC and not X86
364
365 #define DEFINE_GETSETOOP(jboolean, Boolean) \
366 \
367 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
368 UnsafeWrapper("Unsafe_Get"#Boolean); \
369 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
370 GET_FIELD(obj, offset, jboolean, v); \
371 return v; \
372 UNSAFE_END \
373 \
374 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
375 UnsafeWrapper("Unsafe_Set"#Boolean); \
376 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
377 SET_FIELD(obj, offset, jboolean, x); \
378 UNSAFE_END \
379 \
380 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
381 UnsafeWrapper("Unsafe_Get"#Boolean); \
382 GET_FIELD(obj, offset, jboolean, v); \
383 return v; \
384 UNSAFE_END \
385 \
386 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
387 UnsafeWrapper("Unsafe_Set"#Boolean); \
388 SET_FIELD(obj, offset, jboolean, x); \
389 UNSAFE_END \
390 \
391 // END DEFINE_GETSETOOP.
392
393 DEFINE_GETSETOOP(jboolean, Boolean)
394 DEFINE_GETSETOOP(jbyte, Byte)
395 DEFINE_GETSETOOP(jshort, Short);
396 DEFINE_GETSETOOP(jchar, Char);
397 DEFINE_GETSETOOP(jint, Int);
398 DEFINE_GETSETOOP(jlong, Long);
399 DEFINE_GETSETOOP(jfloat, Float);
400 DEFINE_GETSETOOP(jdouble, Double);
401
402 #undef DEFINE_GETSETOOP
403
404 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
405 \
406 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
407 UnsafeWrapper("Unsafe_Get"#Boolean); \
408 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
409 return v; \
410 UNSAFE_END \
411 \
412 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
413 UnsafeWrapper("Unsafe_Set"#Boolean); \
414 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
415 UNSAFE_END \
416 \
417 // END DEFINE_GETSETOOP_VOLATILE.
418
419 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
420 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
421 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
422 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
423 DEFINE_GETSETOOP_VOLATILE(jint, Int);
424 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
425 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
426
427 #if defined(SPARC) || defined(X86)
428 // Sparc and X86 have atomic jlong (8 bytes) instructions
429 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
430 #endif
431
432 #undef DEFINE_GETSETOOP_VOLATILE
433
434 // The non-intrinsified versions of setOrdered just use setVolatile
435
436 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
437 UnsafeWrapper("Unsafe_SetOrderedInt");
438 SET_FIELD_VOLATILE(obj, offset, jint, x);
439 UNSAFE_END
440
441 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
442 UnsafeWrapper("Unsafe_SetOrderedObject");
443 oop x = JNIHandles::resolve(x_h);
444 oop p = JNIHandles::resolve(obj);
445 void* addr = index_oop_from_field_offset_long(p, offset);
446 OrderAccess::release();
447 if (UseCompressedOops) {
448 oop_store((narrowOop*)addr, x);
449 } else {
450 oop_store((oop*)addr, x);
451 }
452 OrderAccess::fence();
453 UNSAFE_END
454
455 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
456 UnsafeWrapper("Unsafe_SetOrderedLong");
457 #if defined(SPARC) || defined(X86)
458 // Sparc and X86 have atomic jlong (8 bytes) instructions
459 SET_FIELD_VOLATILE(obj, offset, jlong, x);
460 #else
461 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
462 {
463 if (VM_Version::supports_cx8()) {
464 SET_FIELD_VOLATILE(obj, offset, jlong, x);
465 }
466 else {
467 Handle p (THREAD, JNIHandles::resolve(obj));
468 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
469 ObjectLocker ol(p, THREAD);
470 *addr = x;
471 }
472 }
473 #endif
474 UNSAFE_END
475
476 ////// Data in the C heap.
477
478 // Note: These do not throw NullPointerException for bad pointers.
479 // They just crash. Only a oop base pointer can generate a NullPointerException.
480 //
481 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
482 \
483 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
484 UnsafeWrapper("Unsafe_GetNative"#Type); \
485 void* p = addr_from_java(addr); \
486 JavaThread* t = JavaThread::current(); \
487 t->set_doing_unsafe_access(true); \
488 java_type x = *(volatile native_type*)p; \
489 t->set_doing_unsafe_access(false); \
490 return x; \
491 UNSAFE_END \
492 \
493 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
494 UnsafeWrapper("Unsafe_SetNative"#Type); \
495 JavaThread* t = JavaThread::current(); \
496 t->set_doing_unsafe_access(true); \
497 void* p = addr_from_java(addr); \
498 *(volatile native_type*)p = x; \
499 t->set_doing_unsafe_access(false); \
500 UNSAFE_END \
501 \
502 // END DEFINE_GETSETNATIVE.
503
504 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
505 DEFINE_GETSETNATIVE(jshort, Short, signed short);
506 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
507 DEFINE_GETSETNATIVE(jint, Int, jint);
508 // no long -- handled specially
509 DEFINE_GETSETNATIVE(jfloat, Float, float);
510 DEFINE_GETSETNATIVE(jdouble, Double, double);
511
512 #undef DEFINE_GETSETNATIVE
513
514 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
515 UnsafeWrapper("Unsafe_GetNativeLong");
516 JavaThread* t = JavaThread::current();
517 // We do it this way to avoid problems with access to heap using 64
518 // bit loads, as jlong in heap could be not 64-bit aligned, and on
519 // some CPUs (SPARC) it leads to SIGBUS.
520 t->set_doing_unsafe_access(true);
521 void* p = addr_from_java(addr);
522 jlong x;
523 if (((intptr_t)p & 7) == 0) {
524 // jlong is aligned, do a volatile access
525 x = *(volatile jlong*)p;
526 } else {
527 jlong_accessor acc;
528 acc.words[0] = ((volatile jint*)p)[0];
529 acc.words[1] = ((volatile jint*)p)[1];
530 x = acc.long_value;
531 }
532 t->set_doing_unsafe_access(false);
533 return x;
534 UNSAFE_END
535
536 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
537 UnsafeWrapper("Unsafe_SetNativeLong");
538 JavaThread* t = JavaThread::current();
539 // see comment for Unsafe_GetNativeLong
540 t->set_doing_unsafe_access(true);
541 void* p = addr_from_java(addr);
542 if (((intptr_t)p & 7) == 0) {
543 // jlong is aligned, do a volatile access
544 *(volatile jlong*)p = x;
545 } else {
546 jlong_accessor acc;
547 acc.long_value = x;
548 ((volatile jint*)p)[0] = acc.words[0];
549 ((volatile jint*)p)[1] = acc.words[1];
550 }
551 t->set_doing_unsafe_access(false);
552 UNSAFE_END
553
554
555 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
556 UnsafeWrapper("Unsafe_GetNativeAddress");
557 void* p = addr_from_java(addr);
558 return addr_to_java(*(void**)p);
559 UNSAFE_END
560
561 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
562 UnsafeWrapper("Unsafe_SetNativeAddress");
563 void* p = addr_from_java(addr);
564 *(void**)p = addr_from_java(x);
565 UNSAFE_END
566
567
568 ////// Allocation requests
569
570 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
571 UnsafeWrapper("Unsafe_AllocateInstance");
572 {
573 ThreadToNativeFromVM ttnfv(thread);
574 return env->AllocObject(cls);
575 }
576 UNSAFE_END
577
578 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
579 UnsafeWrapper("Unsafe_AllocateMemory");
580 size_t sz = (size_t)size;
581 if (sz != (julong)size || size < 0) {
582 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
583 }
584 if (sz == 0) {
585 return 0;
586 }
587 sz = round_to(sz, HeapWordSize);
588 void* x = os::malloc(sz);
589 if (x == NULL) {
590 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
591 }
592 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
593 return addr_to_java(x);
594 UNSAFE_END
595
596 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
597 UnsafeWrapper("Unsafe_ReallocateMemory");
598 void* p = addr_from_java(addr);
599 size_t sz = (size_t)size;
600 if (sz != (julong)size || size < 0) {
601 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
602 }
603 if (sz == 0) {
604 os::free(p);
605 return 0;
606 }
607 sz = round_to(sz, HeapWordSize);
608 void* x = (p == NULL) ? os::malloc(sz) : os::realloc(p, sz);
609 if (x == NULL) {
610 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
611 }
612 return addr_to_java(x);
613 UNSAFE_END
614
615 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
616 UnsafeWrapper("Unsafe_FreeMemory");
617 void* p = addr_from_java(addr);
618 if (p == NULL) {
619 return;
620 }
621 os::free(p);
622 UNSAFE_END
623
624 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
625 UnsafeWrapper("Unsafe_SetMemory");
626 size_t sz = (size_t)size;
627 if (sz != (julong)size || size < 0) {
628 THROW(vmSymbols::java_lang_IllegalArgumentException());
629 }
630 char* p = (char*) addr_from_java(addr);
631 Copy::fill_to_memory_atomic(p, sz, value);
632 UNSAFE_END
633
634 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
635 UnsafeWrapper("Unsafe_SetMemory");
636 size_t sz = (size_t)size;
637 if (sz != (julong)size || size < 0) {
638 THROW(vmSymbols::java_lang_IllegalArgumentException());
639 }
640 oop base = JNIHandles::resolve(obj);
641 void* p = index_oop_from_field_offset_long(base, offset);
642 Copy::fill_to_memory_atomic(p, sz, value);
643 UNSAFE_END
644
645 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
646 UnsafeWrapper("Unsafe_CopyMemory");
647 if (size == 0) {
648 return;
649 }
650 size_t sz = (size_t)size;
651 if (sz != (julong)size || size < 0) {
652 THROW(vmSymbols::java_lang_IllegalArgumentException());
653 }
654 void* src = addr_from_java(srcAddr);
655 void* dst = addr_from_java(dstAddr);
656 Copy::conjoint_memory_atomic(src, dst, sz);
657 UNSAFE_END
658
659 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
660 UnsafeWrapper("Unsafe_CopyMemory");
661 if (size == 0) {
662 return;
663 }
664 size_t sz = (size_t)size;
665 if (sz != (julong)size || size < 0) {
666 THROW(vmSymbols::java_lang_IllegalArgumentException());
667 }
668 oop srcp = JNIHandles::resolve(srcObj);
669 oop dstp = JNIHandles::resolve(dstObj);
670 if (dstp != NULL && !dstp->is_typeArray()) {
671 // NYI: This works only for non-oop arrays at present.
672 // Generalizing it would be reasonable, but requires card marking.
673 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
674 THROW(vmSymbols::java_lang_IllegalArgumentException());
675 }
676 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
677 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
678 Copy::conjoint_memory_atomic(src, dst, sz);
679 UNSAFE_END
680
681
682 ////// Random queries
683
684 // See comment at file start about UNSAFE_LEAF
685 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
686 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
687 UnsafeWrapper("Unsafe_AddressSize");
688 return sizeof(void*);
689 UNSAFE_END
690
691 // See comment at file start about UNSAFE_LEAF
692 //UNSAFE_LEAF(jint, Unsafe_PageSize())
693 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
694 UnsafeWrapper("Unsafe_PageSize");
695 return os::vm_page_size();
696 UNSAFE_END
697
698 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
699 if (field == NULL) {
700 THROW_0(vmSymbols::java_lang_NullPointerException());
701 }
702
703 oop reflected = JNIHandles::resolve_non_null(field);
704 oop mirror = java_lang_reflect_Field::clazz(reflected);
705 klassOop k = java_lang_Class::as_klassOop(mirror);
706 int slot = java_lang_reflect_Field::slot(reflected);
707 int modifiers = java_lang_reflect_Field::modifiers(reflected);
708
709 if (must_be_static >= 0) {
710 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
711 if (must_be_static != really_is_static) {
712 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
713 }
714 }
715
716 int offset = instanceKlass::cast(k)->offset_from_fields(slot);
717 return field_offset_from_byte_offset(offset);
718 }
719
720 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
721 UnsafeWrapper("Unsafe_ObjectFieldOffset");
722 return find_field_offset(field, 0, THREAD);
723 UNSAFE_END
724
725 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
726 UnsafeWrapper("Unsafe_StaticFieldOffset");
727 return find_field_offset(field, 1, THREAD);
728 UNSAFE_END
729
730 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
731 UnsafeWrapper("Unsafe_StaticFieldBase");
732 // Note: In this VM implementation, a field address is always a short
733 // offset from the base of a a klass metaobject. Thus, the full dynamic
734 // range of the return type is never used. However, some implementations
735 // might put the static field inside an array shared by many classes,
736 // or even at a fixed address, in which case the address could be quite
737 // large. In that last case, this function would return NULL, since
738 // the address would operate alone, without any base pointer.
739
740 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
741
742 oop reflected = JNIHandles::resolve_non_null(field);
743 oop mirror = java_lang_reflect_Field::clazz(reflected);
744 int modifiers = java_lang_reflect_Field::modifiers(reflected);
745
746 if ((modifiers & JVM_ACC_STATIC) == 0) {
747 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
748 }
749
750 return JNIHandles::make_local(env, mirror);
751 UNSAFE_END
752
753 //@deprecated
754 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
755 UnsafeWrapper("Unsafe_FieldOffset");
756 // tries (but fails) to be polymorphic between static and non-static:
757 jlong offset = find_field_offset(field, -1, THREAD);
758 guarantee(offset == (jint)offset, "offset fits in 32 bits");
759 return (jint)offset;
760 UNSAFE_END
761
762 //@deprecated
763 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
764 UnsafeWrapper("Unsafe_StaticFieldBase");
765 if (clazz == NULL) {
766 THROW_0(vmSymbols::java_lang_NullPointerException());
767 }
768 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
769 UNSAFE_END
770
771 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz))
772 UnsafeWrapper("Unsafe_EnsureClassInitialized");
773 if (clazz == NULL) {
774 THROW(vmSymbols::java_lang_NullPointerException());
775 }
776 oop mirror = JNIHandles::resolve_non_null(clazz);
777 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(mirror));
778 if (k != NULL) {
779 k->initialize(CHECK);
780 }
781 UNSAFE_END
782
783 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
784 if (acls == NULL) {
785 THROW(vmSymbols::java_lang_NullPointerException());
786 }
787 oop mirror = JNIHandles::resolve_non_null(acls);
788 klassOop k = java_lang_Class::as_klassOop(mirror);
789 if (k == NULL || !k->klass_part()->oop_is_array()) {
790 THROW(vmSymbols::java_lang_InvalidClassException());
791 } else if (k->klass_part()->oop_is_objArray()) {
792 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
793 scale = heapOopSize;
794 } else if (k->klass_part()->oop_is_typeArray()) {
795 typeArrayKlass* tak = typeArrayKlass::cast(k);
796 base = tak->array_header_in_bytes();
797 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
798 scale = (1 << tak->log2_element_size());
799 } else {
800 ShouldNotReachHere();
801 }
802 }
803
804 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
805 UnsafeWrapper("Unsafe_ArrayBaseOffset");
806 int base, scale;
807 getBaseAndScale(base, scale, acls, CHECK_0);
808 return field_offset_from_byte_offset(base);
809 UNSAFE_END
810
811
812 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
813 UnsafeWrapper("Unsafe_ArrayIndexScale");
814 int base, scale;
815 getBaseAndScale(base, scale, acls, CHECK_0);
816 // This VM packs both fields and array elements down to the byte.
817 // But watch out: If this changes, so that array references for
818 // a given primitive type (say, T_BOOLEAN) use different memory units
819 // than fields, this method MUST return zero for such arrays.
820 // For example, the VM used to store sub-word sized fields in full
821 // words in the object layout, so that accessors like getByte(Object,int)
822 // did not really do what one might expect for arrays. Therefore,
823 // this function used to report a zero scale factor, so that the user
824 // would know not to attempt to access sub-word array elements.
825 // // Code for unpacked fields:
826 // if (scale < wordSize) return 0;
827
828 // The following allows for a pretty general fieldOffset cookie scheme,
829 // but requires it to be linear in byte offset.
830 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
831 UNSAFE_END
832
833
834 static inline void throw_new(JNIEnv *env, const char *ename) {
835 char buf[100];
836 strcpy(buf, "java/lang/");
837 strcat(buf, ename);
838 jclass cls = env->FindClass(buf);
839 char* msg = NULL;
840 env->ThrowNew(cls, msg);
841 }
842
843 static jclass Unsafe_DefineClass(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
844 {
845 // Code lifted from JDK 1.3 ClassLoader.c
846
847 jbyte *body;
848 char *utfName;
849 jclass result = 0;
850 char buf[128];
851
852 if (UsePerfData) {
853 ClassLoader::unsafe_defineClassCallCounter()->inc();
854 }
855
856 if (data == NULL) {
857 throw_new(env, "NullPointerException");
858 return 0;
859 }
860
861 /* Work around 4153825. malloc crashes on Solaris when passed a
862 * negative size.
863 */
864 if (length < 0) {
865 throw_new(env, "ArrayIndexOutOfBoundsException");
866 return 0;
867 }
868
869 body = NEW_C_HEAP_ARRAY(jbyte, length);
870
871 if (body == 0) {
872 throw_new(env, "OutOfMemoryError");
873 return 0;
874 }
875
876 env->GetByteArrayRegion(data, offset, length, body);
877
878 if (env->ExceptionOccurred())
879 goto free_body;
880
881 if (name != NULL) {
882 uint len = env->GetStringUTFLength(name);
883 int unicode_len = env->GetStringLength(name);
884 if (len >= sizeof(buf)) {
885 utfName = NEW_C_HEAP_ARRAY(char, len + 1);
886 if (utfName == NULL) {
887 throw_new(env, "OutOfMemoryError");
888 goto free_body;
889 }
890 } else {
891 utfName = buf;
892 }
893 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
894 //VerifyFixClassname(utfName);
895 for (uint i = 0; i < len; i++) {
896 if (utfName[i] == '.') utfName[i] = '/';
897 }
898 } else {
899 utfName = NULL;
900 }
901
902 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
903
904 if (utfName && utfName != buf)
905 FREE_C_HEAP_ARRAY(char, utfName);
906
907 free_body:
908 FREE_C_HEAP_ARRAY(jbyte, body);
909 return result;
910 }
911 }
912
913
914 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
915 UnsafeWrapper("Unsafe_DefineClass");
916 {
917 ThreadToNativeFromVM ttnfv(thread);
918
919 int depthFromDefineClass0 = 1;
920 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
921 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
922 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
923
924 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
925 }
926 UNSAFE_END
927
928
929 UNSAFE_ENTRY(jclass, Unsafe_DefineClass1(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
930 UnsafeWrapper("Unsafe_DefineClass");
931 {
932 ThreadToNativeFromVM ttnfv(thread);
933
934 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
935 }
936 UNSAFE_END
937
938 #define DAC_Args CLS"[B["OBJ
939 // define a class but do not make it known to the class loader or system dictionary
940 // - host_class: supplies context for linkage, access control, protection domain, and class loader
941 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
942 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
943
944 // When you load an anonymous class U, it works as if you changed its name just before loading,
945 // to a name that you will never use again. Since the name is lost, no other class can directly
946 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
947 // through java.lang.Class methods like Class.newInstance.
948
949 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
950 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
951 // An anonymous class also has special privileges to access any member of its host class.
952 // This is the main reason why this loading operation is unsafe. The purpose of this is to
953 // allow language implementations to simulate "open classes"; a host class in effect gets
954 // new code when an anonymous class is loaded alongside it. A less convenient but more
955 // standard way to do this is with reflection, which can also be set to ignore access
956 // restrictions.
957
958 // Access into an anonymous class is possible only through reflection. Therefore, there
959 // are no special access rules for calling into an anonymous class. The relaxed access
960 // rule for the host class is applied in the opposite direction: A host class reflectively
961 // access one of its anonymous classes.
962
963 // If you load the same bytecodes twice, you get two different classes. You can reload
964 // the same bytecodes with or without varying CP patches.
965
966 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
967 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
968 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
969
970 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
971 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
972 // It is not possible for a named class, or an older anonymous class, to refer by
973 // name (via its CP) to a newer anonymous class.
974
975 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
976 // or type descriptors used in the loaded anonymous class.
977
978 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
979 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
980 // be changed to println(greeting), where greeting is an arbitrary object created before
981 // the anonymous class is loaded. This is useful in dynamic languages, in which
982 // various kinds of metaobjects must be introduced as constants into bytecode.
983 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
984 // not just a literal string. For such ldc instructions, the verifier uses the
985 // type Object instead of String, if the loaded constant is not in fact a String.
986
987 static oop
988 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
989 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
990 HeapWord* *temp_alloc,
991 TRAPS) {
992
993 if (UsePerfData) {
994 ClassLoader::unsafe_defineClassCallCounter()->inc();
995 }
996
997 if (data == NULL) {
998 THROW_0(vmSymbols::java_lang_NullPointerException());
999 }
1000
1001 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
1002 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
1003 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length);
1004 if (body == NULL) {
1005 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1006 }
1007
1008 // caller responsible to free it:
1009 (*temp_alloc) = body;
1010
1011 {
1012 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1013 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1014 }
1015
1016 u1* class_bytes = (u1*) body;
1017 int class_bytes_length = (int) length;
1018 if (class_bytes_length < 0) class_bytes_length = 0;
1019 if (class_bytes == NULL
1020 || host_class == NULL
1021 || length != class_bytes_length)
1022 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1023
1024 objArrayHandle cp_patches_h;
1025 if (cp_patches_jh != NULL) {
1026 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1027 if (!p->is_objArray())
1028 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1029 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1030 }
1031
1032 KlassHandle host_klass(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(host_class)));
1033 const char* host_source = host_klass->external_name();
1034 Handle host_loader(THREAD, host_klass->class_loader());
1035 Handle host_domain(THREAD, host_klass->protection_domain());
1036
1037 GrowableArray<Handle>* cp_patches = NULL;
1038 if (cp_patches_h.not_null()) {
1039 int alen = cp_patches_h->length();
1040 for (int i = alen-1; i >= 0; i--) {
1041 oop p = cp_patches_h->obj_at(i);
1042 if (p != NULL) {
1043 Handle patch(THREAD, p);
1044 if (cp_patches == NULL)
1045 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1046 cp_patches->at_put(i, patch);
1047 }
1048 }
1049 }
1050
1051 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1052
1053 instanceKlassHandle anon_klass;
1054 {
1055 Symbol* no_class_name = NULL;
1056 klassOop anonk = SystemDictionary::parse_stream(no_class_name,
1057 host_loader, host_domain,
1058 &st, host_klass, cp_patches,
1059 CHECK_NULL);
1060 if (anonk == NULL) return NULL;
1061 anon_klass = instanceKlassHandle(THREAD, anonk);
1062 }
1063
1064 // let caller initialize it as needed...
1065
1066 return anon_klass->java_mirror();
1067 }
1068
1069 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1070 {
1071 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1072 ResourceMark rm(THREAD);
1073
1074 HeapWord* temp_alloc = NULL;
1075
1076 jobject res_jh = NULL;
1077
1078 { oop res_oop = Unsafe_DefineAnonymousClass_impl(env,
1079 host_class, data, cp_patches_jh,
1080 &temp_alloc, THREAD);
1081 if (res_oop != NULL)
1082 res_jh = JNIHandles::make_local(env, res_oop);
1083 }
1084
1085 // try/finally clause:
1086 if (temp_alloc != NULL) {
1087 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc);
1088 }
1089
1090 return (jclass) res_jh;
1091 }
1092 UNSAFE_END
1093
1094
1095
1096 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1097 UnsafeWrapper("Unsafe_MonitorEnter");
1098 {
1099 if (jobj == NULL) {
1100 THROW(vmSymbols::java_lang_NullPointerException());
1101 }
1102 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1103 ObjectSynchronizer::jni_enter(obj, CHECK);
1104 }
1105 UNSAFE_END
1106
1107
1108 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1109 UnsafeWrapper("Unsafe_TryMonitorEnter");
1110 {
1111 if (jobj == NULL) {
1112 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1113 }
1114 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1115 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1116 return (res ? JNI_TRUE : JNI_FALSE);
1117 }
1118 UNSAFE_END
1119
1120
1121 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1122 UnsafeWrapper("Unsafe_MonitorExit");
1123 {
1124 if (jobj == NULL) {
1125 THROW(vmSymbols::java_lang_NullPointerException());
1126 }
1127 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1128 ObjectSynchronizer::jni_exit(obj(), CHECK);
1129 }
1130 UNSAFE_END
1131
1132
1133 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1134 UnsafeWrapper("Unsafe_ThrowException");
1135 {
1136 ThreadToNativeFromVM ttnfv(thread);
1137 env->Throw(thr);
1138 }
1139 UNSAFE_END
1140
1141 // JSR166 ------------------------------------------------------------------
1142
1143 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1144 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1145 oop x = JNIHandles::resolve(x_h);
1146 oop e = JNIHandles::resolve(e_h);
1147 oop p = JNIHandles::resolve(obj);
1148 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1149 if (UseCompressedOops) {
1150 update_barrier_set_pre((narrowOop*)addr, e);
1151 } else {
1152 update_barrier_set_pre((oop*)addr, e);
1153 }
1154 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e);
1155 jboolean success = (res == e);
1156 if (success)
1157 update_barrier_set((void*)addr, x);
1158 return success;
1159 UNSAFE_END
1160
1161 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1162 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1163 oop p = JNIHandles::resolve(obj);
1164 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1165 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1166 UNSAFE_END
1167
1168 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1169 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1170 Handle p (THREAD, JNIHandles::resolve(obj));
1171 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1172 if (VM_Version::supports_cx8())
1173 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1174 else {
1175 jboolean success = false;
1176 ObjectLocker ol(p, THREAD);
1177 if (*addr == e) { *addr = x; success = true; }
1178 return success;
1179 }
1180 UNSAFE_END
1181
1182 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1183 UnsafeWrapper("Unsafe_Park");
1184 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1185 JavaThreadParkedState jtps(thread, time != 0);
1186 thread->parker()->park(isAbsolute != 0, time);
1187 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1188 UNSAFE_END
1189
1190 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1191 UnsafeWrapper("Unsafe_Unpark");
1192 Parker* p = NULL;
1193 if (jthread != NULL) {
1194 oop java_thread = JNIHandles::resolve_non_null(jthread);
1195 if (java_thread != NULL) {
1196 jlong lp = java_lang_Thread::park_event(java_thread);
1197 if (lp != 0) {
1198 // This cast is OK even though the jlong might have been read
1199 // non-atomically on 32bit systems, since there, one word will
1200 // always be zero anyway and the value set is always the same
1201 p = (Parker*)addr_from_java(lp);
1202 } else {
1203 // Grab lock if apparently null or using older version of library
1204 MutexLocker mu(Threads_lock);
1205 java_thread = JNIHandles::resolve_non_null(jthread);
1206 if (java_thread != NULL) {
1207 JavaThread* thr = java_lang_Thread::thread(java_thread);
1208 if (thr != NULL) {
1209 p = thr->parker();
1210 if (p != NULL) { // Bind to Java thread for next time.
1211 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1212 }
1213 }
1214 }
1215 }
1216 }
1217 }
1218 if (p != NULL) {
1219 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1220 p->unpark();
1221 }
1222 UNSAFE_END
1223
1224 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1225 UnsafeWrapper("Unsafe_Loadavg");
1226 const int max_nelem = 3;
1227 double la[max_nelem];
1228 jint ret;
1229
1230 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1231 assert(a->is_typeArray(), "must be type array");
1232
1233 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1234 ThreadToNativeFromVM ttnfv(thread);
1235 throw_new(env, "ArrayIndexOutOfBoundsException");
1236 return -1;
1237 }
1238
1239 ret = os::loadavg(la, nelem);
1240 if (ret == -1) return -1;
1241
1242 // if successful, ret is the number of samples actually retrieved.
1243 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1244 switch(ret) {
1245 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1246 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1247 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1248 }
1249 return ret;
1250 UNSAFE_END
1251
1252 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1253 UnsafeWrapper("Unsafe_PrefetchRead");
1254 oop p = JNIHandles::resolve(obj);
1255 void* addr = index_oop_from_field_offset_long(p, 0);
1256 Prefetch::read(addr, (intx)offset);
1257 UNSAFE_END
1258
1259 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1260 UnsafeWrapper("Unsafe_PrefetchWrite");
1261 oop p = JNIHandles::resolve(obj);
1262 void* addr = index_oop_from_field_offset_long(p, 0);
1263 Prefetch::write(addr, (intx)offset);
1264 UNSAFE_END
1265
1266
1267 /// JVM_RegisterUnsafeMethods
1268
1269 #define ADR "J"
1270
1271 #define LANG "Ljava/lang/"
1272
1273 #define OBJ LANG"Object;"
1274 #define CLS LANG"Class;"
1275 #define CTR LANG"reflect/Constructor;"
1276 #define FLD LANG"reflect/Field;"
1277 #define MTH LANG"reflect/Method;"
1278 #define THR LANG"Throwable;"
1279
1280 #define DC0_Args LANG"String;[BII"
1281 #define DC1_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1282
1283 #define CC (char*) /*cast a literal from (const char*)*/
1284 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1285
1286 // define deprecated accessors for compabitility with 1.4.0
1287 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1288 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1289 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1290
1291 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1292 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1293 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1294 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1295
1296 // Note: In 1.5.0, there are volatile versions too
1297 #define DECLARE_GETSETOOP(Boolean, Z) \
1298 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1299 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1300 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1301 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1302
1303
1304 #define DECLARE_GETSETNATIVE(Byte, B) \
1305 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1306 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1307
1308
1309
1310 // %%% These are temporarily supported until the SDK sources
1311 // contain the necessarily updated Unsafe.java.
1312 static JNINativeMethod methods_140[] = {
1313
1314 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)},
1315 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)},
1316
1317 DECLARE_GETSETOOP_140(Boolean, Z),
1318 DECLARE_GETSETOOP_140(Byte, B),
1319 DECLARE_GETSETOOP_140(Short, S),
1320 DECLARE_GETSETOOP_140(Char, C),
1321 DECLARE_GETSETOOP_140(Int, I),
1322 DECLARE_GETSETOOP_140(Long, J),
1323 DECLARE_GETSETOOP_140(Float, F),
1324 DECLARE_GETSETOOP_140(Double, D),
1325
1326 DECLARE_GETSETNATIVE(Byte, B),
1327 DECLARE_GETSETNATIVE(Short, S),
1328 DECLARE_GETSETNATIVE(Char, C),
1329 DECLARE_GETSETNATIVE(Int, I),
1330 DECLARE_GETSETNATIVE(Long, J),
1331 DECLARE_GETSETNATIVE(Float, F),
1332 DECLARE_GETSETNATIVE(Double, D),
1333
1334 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1335 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1336
1337 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1338 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1339 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1340 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1341 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1342
1343 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, //deprecated
1344 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, //deprecated
1345 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1346 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1347 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1348 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1349 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1350
1351 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1352 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1353 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1354 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1355 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1356 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1357 };
1358
1359 // These are the old methods prior to the JSR 166 changes in 1.5.0
1360 static JNINativeMethod methods_141[] = {
1361
1362 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1363 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1364
1365 DECLARE_GETSETOOP_141(Boolean, Z),
1366 DECLARE_GETSETOOP_141(Byte, B),
1367 DECLARE_GETSETOOP_141(Short, S),
1368 DECLARE_GETSETOOP_141(Char, C),
1369 DECLARE_GETSETOOP_141(Int, I),
1370 DECLARE_GETSETOOP_141(Long, J),
1371 DECLARE_GETSETOOP_141(Float, F),
1372 DECLARE_GETSETOOP_141(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"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1388 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1389 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1390
1391 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1392 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1393 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1394 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1395 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1396 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1397 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1398 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1399
1400 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1401 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1402 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1403 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1404 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1405 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1406
1407 };
1408
1409 // These are the old methods prior to the JSR 166 changes in 1.6.0
1410 static JNINativeMethod methods_15[] = {
1411
1412 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1413 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1414 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1415 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1416
1417
1418 DECLARE_GETSETOOP(Boolean, Z),
1419 DECLARE_GETSETOOP(Byte, B),
1420 DECLARE_GETSETOOP(Short, S),
1421 DECLARE_GETSETOOP(Char, C),
1422 DECLARE_GETSETOOP(Int, I),
1423 DECLARE_GETSETOOP(Long, J),
1424 DECLARE_GETSETOOP(Float, F),
1425 DECLARE_GETSETOOP(Double, D),
1426
1427 DECLARE_GETSETNATIVE(Byte, B),
1428 DECLARE_GETSETNATIVE(Short, S),
1429 DECLARE_GETSETNATIVE(Char, C),
1430 DECLARE_GETSETNATIVE(Int, I),
1431 DECLARE_GETSETNATIVE(Long, J),
1432 DECLARE_GETSETNATIVE(Float, F),
1433 DECLARE_GETSETNATIVE(Double, D),
1434
1435 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1436 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1437
1438 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1439 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1440 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1441 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1442 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1443
1444 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1445 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1446 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1447 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1448 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1449 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1450 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1451 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1452
1453 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1454 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1455 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1456 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1457 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1458 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1459 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1460 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1461 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1462 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1463 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1464
1465 };
1466
1467 // These are the correct methods, moving forward:
1468 static JNINativeMethod methods[] = {
1469
1470 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1471 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1472 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1473 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1474
1475
1476 DECLARE_GETSETOOP(Boolean, Z),
1477 DECLARE_GETSETOOP(Byte, B),
1478 DECLARE_GETSETOOP(Short, S),
1479 DECLARE_GETSETOOP(Char, C),
1480 DECLARE_GETSETOOP(Int, I),
1481 DECLARE_GETSETOOP(Long, J),
1482 DECLARE_GETSETOOP(Float, F),
1483 DECLARE_GETSETOOP(Double, D),
1484
1485 DECLARE_GETSETNATIVE(Byte, B),
1486 DECLARE_GETSETNATIVE(Short, S),
1487 DECLARE_GETSETNATIVE(Char, C),
1488 DECLARE_GETSETNATIVE(Int, I),
1489 DECLARE_GETSETNATIVE(Long, J),
1490 DECLARE_GETSETNATIVE(Float, F),
1491 DECLARE_GETSETNATIVE(Double, D),
1492
1493 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1494 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1495
1496 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1497 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1498 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1499 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1500 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1501
1502 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1503 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1504 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1505 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1506 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1507 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1508 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1509 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1510
1511 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1512 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1513 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1514 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1515 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1516 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1517 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1518 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1519 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1520 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1521 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1522 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1523 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1524 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1525 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1526
1527 // {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)},
1528
1529 // {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1530 // {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1531 // {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1532 // {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1533
1534 };
1535
1536 JNINativeMethod loadavg_method[] = {
1537 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1538 };
1539
1540 JNINativeMethod prefetch_methods[] = {
1541 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1542 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1543 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1544 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1545 };
1546
1547 JNINativeMethod memcopy_methods[] = {
1548 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1549 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1550 };
1551
1552 JNINativeMethod memcopy_methods_15[] = {
1553 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1554 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1555 };
1556
1557 JNINativeMethod anonk_methods[] = {
1558 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1559 };
1560
1561 #undef CC
1562 #undef FN_PTR
1563
1564 #undef ADR
1565 #undef LANG
1566 #undef OBJ
1567 #undef CLS
1568 #undef CTR
1569 #undef FLD
1570 #undef MTH
1571 #undef THR
1572 #undef DC0_Args
1573 #undef DC1_Args
1574
1575 #undef DECLARE_GETSETOOP
1576 #undef DECLARE_GETSETNATIVE
1577
1578
1579 // This one function is exported, used by NativeLookup.
1580 // The Unsafe_xxx functions above are called only from the interpreter.
1581 // The optimizer looks at names and signatures to recognize
1582 // individual functions.
1583
1584 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1585 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1586 {
1587 ThreadToNativeFromVM ttnfv(thread);
1588 {
1589 env->RegisterNatives(unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1590 if (env->ExceptionOccurred()) {
1591 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1592 tty->print_cr("Warning: SDK 1.6 Unsafe.loadavg not found.");
1593 }
1594 env->ExceptionClear();
1595 }
1596 }
1597 {
1598 env->RegisterNatives(unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1599 if (env->ExceptionOccurred()) {
1600 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1601 tty->print_cr("Warning: SDK 1.6 Unsafe.prefetchRead/Write not found.");
1602 }
1603 env->ExceptionClear();
1604 }
1605 }
1606 {
1607 env->RegisterNatives(unsafecls, memcopy_methods, sizeof(memcopy_methods)/sizeof(JNINativeMethod));
1608 if (env->ExceptionOccurred()) {
1609 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1610 tty->print_cr("Warning: SDK 1.7 Unsafe.copyMemory not found.");
1611 }
1612 env->ExceptionClear();
1613 env->RegisterNatives(unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1614 if (env->ExceptionOccurred()) {
1615 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1616 tty->print_cr("Warning: SDK 1.5 Unsafe.copyMemory not found.");
1617 }
1618 env->ExceptionClear();
1619 }
1620 }
1621 }
1622 if (AnonymousClasses) {
1623 env->RegisterNatives(unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1624 if (env->ExceptionOccurred()) {
1625 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1626 tty->print_cr("Warning: SDK 1.7 Unsafe.defineClass (anonymous version) not found.");
1627 }
1628 env->ExceptionClear();
1629 }
1630 }
1631 int status = env->RegisterNatives(unsafecls, methods, sizeof(methods)/sizeof(JNINativeMethod));
1632 if (env->ExceptionOccurred()) {
1633 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1634 tty->print_cr("Warning: SDK 1.6 version of Unsafe not found.");
1635 }
1636 env->ExceptionClear();
1637 // %%% For now, be backward compatible with an older class:
1638 status = env->RegisterNatives(unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1639 }
1640 if (env->ExceptionOccurred()) {
1641 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1642 tty->print_cr("Warning: SDK 1.5 version of Unsafe not found.");
1643 }
1644 env->ExceptionClear();
1645 // %%% For now, be backward compatible with an older class:
1646 status = env->RegisterNatives(unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1647 }
1648 if (env->ExceptionOccurred()) {
1649 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1650 tty->print_cr("Warning: SDK 1.4.1 version of Unsafe not found.");
1651 }
1652 env->ExceptionClear();
1653 // %%% For now, be backward compatible with an older class:
1654 status = env->RegisterNatives(unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1655 }
1656 guarantee(status == 0, "register unsafe natives");
1657 }
1658 JVM_END