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 return JNIHandles::make_local(env, v);
197 UNSAFE_END
198
199 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
200 UnsafeWrapper("Unsafe_SetObject");
201 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
202 oop x = JNIHandles::resolve(x_h);
203 //SET_FIELD(obj, offset, oop, x);
204 oop p = JNIHandles::resolve(obj);
205 if (UseCompressedOops) {
206 if (x != NULL) {
207 // If there is a heap base pointer, we are obliged to emit a store barrier.
208 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
209 } else {
210 narrowOop n = oopDesc::encode_heap_oop_not_null(x);
211 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
212 }
213 } else {
214 if (x != NULL) {
215 // If there is a heap base pointer, we are obliged to emit a store barrier.
216 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
217 } else {
218 *(oop*)index_oop_from_field_offset_long(p, offset) = x;
219 }
220 }
221 UNSAFE_END
222
223 // The normal variants allow a null base pointer with an arbitrary address.
224 // But if the base pointer is non-null, the offset should make some sense.
225 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
226 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
227 UnsafeWrapper("Unsafe_GetObject");
228 GET_OOP_FIELD(obj, offset, v)
229 return JNIHandles::make_local(env, v);
230 UNSAFE_END
231
232 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
233 UnsafeWrapper("Unsafe_SetObject");
234 oop x = JNIHandles::resolve(x_h);
235 oop p = JNIHandles::resolve(obj);
236 if (UseCompressedOops) {
237 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
238 } else {
239 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
240 }
241 UNSAFE_END
242
243 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
244 UnsafeWrapper("Unsafe_GetObjectVolatile");
245 GET_OOP_FIELD_VOLATILE(obj, offset, v)
246 return JNIHandles::make_local(env, v);
247 UNSAFE_END
248
249 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
250 UnsafeWrapper("Unsafe_SetObjectVolatile");
251 oop x = JNIHandles::resolve(x_h);
252 oop p = JNIHandles::resolve(obj);
253 void* addr = index_oop_from_field_offset_long(p, offset);
254 OrderAccess::release();
255 if (UseCompressedOops) {
256 oop_store((narrowOop*)addr, x);
257 } else {
258 oop_store((oop*)addr, x);
259 }
260 OrderAccess::fence();
261 UNSAFE_END
262
263 #if defined(SPARC) || defined(X86)
264 // Sparc and X86 have atomic jlong (8 bytes) instructions
265
266 #else
267 // Keep old code for platforms which may not have atomic jlong (8 bytes) instructions
268
269 // Volatile long versions must use locks if !VM_Version::supports_cx8().
270 // support_cx8 is a surrogate for 'supports atomic long memory ops'.
271
272 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
273 UnsafeWrapper("Unsafe_GetLongVolatile");
274 {
275 if (VM_Version::supports_cx8()) {
276 GET_FIELD_VOLATILE(obj, offset, jlong, v);
277 return v;
278 }
279 else {
280 Handle p (THREAD, JNIHandles::resolve(obj));
281 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
282 ObjectLocker ol(p, THREAD);
283 jlong value = *addr;
284 return value;
285 }
286 }
287 UNSAFE_END
288
289 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
290 UnsafeWrapper("Unsafe_SetLongVolatile");
291 {
292 if (VM_Version::supports_cx8()) {
293 SET_FIELD_VOLATILE(obj, offset, jlong, x);
294 }
295 else {
296 Handle p (THREAD, JNIHandles::resolve(obj));
297 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
298 ObjectLocker ol(p, THREAD);
299 *addr = x;
300 }
301 }
302 UNSAFE_END
303
304 #endif // not SPARC and not X86
305
306 #define DEFINE_GETSETOOP(jboolean, Boolean) \
307 \
308 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
309 UnsafeWrapper("Unsafe_Get"#Boolean); \
310 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
311 GET_FIELD(obj, offset, jboolean, v); \
312 return v; \
313 UNSAFE_END \
314 \
315 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
316 UnsafeWrapper("Unsafe_Set"#Boolean); \
317 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
318 SET_FIELD(obj, offset, jboolean, x); \
319 UNSAFE_END \
320 \
321 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
322 UnsafeWrapper("Unsafe_Get"#Boolean); \
323 GET_FIELD(obj, offset, jboolean, v); \
324 return v; \
325 UNSAFE_END \
326 \
327 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
328 UnsafeWrapper("Unsafe_Set"#Boolean); \
329 SET_FIELD(obj, offset, jboolean, x); \
330 UNSAFE_END \
331 \
332 // END DEFINE_GETSETOOP.
333
334 DEFINE_GETSETOOP(jboolean, Boolean)
335 DEFINE_GETSETOOP(jbyte, Byte)
336 DEFINE_GETSETOOP(jshort, Short);
337 DEFINE_GETSETOOP(jchar, Char);
338 DEFINE_GETSETOOP(jint, Int);
339 DEFINE_GETSETOOP(jlong, Long);
340 DEFINE_GETSETOOP(jfloat, Float);
341 DEFINE_GETSETOOP(jdouble, Double);
342
343 #undef DEFINE_GETSETOOP
344
345 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
346 \
347 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
348 UnsafeWrapper("Unsafe_Get"#Boolean); \
349 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
350 return v; \
351 UNSAFE_END \
352 \
353 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
354 UnsafeWrapper("Unsafe_Set"#Boolean); \
355 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
356 UNSAFE_END \
357 \
358 // END DEFINE_GETSETOOP_VOLATILE.
359
360 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
361 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
362 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
363 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
364 DEFINE_GETSETOOP_VOLATILE(jint, Int);
365 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
366 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
367
368 #if defined(SPARC) || defined(X86)
369 // Sparc and X86 have atomic jlong (8 bytes) instructions
370 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
371 #endif
372
373 #undef DEFINE_GETSETOOP_VOLATILE
374
375 // The non-intrinsified versions of setOrdered just use setVolatile
376
377 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
378 UnsafeWrapper("Unsafe_SetOrderedInt");
379 SET_FIELD_VOLATILE(obj, offset, jint, x);
380 UNSAFE_END
381
382 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
383 UnsafeWrapper("Unsafe_SetOrderedObject");
384 oop x = JNIHandles::resolve(x_h);
385 oop p = JNIHandles::resolve(obj);
386 void* addr = index_oop_from_field_offset_long(p, offset);
387 OrderAccess::release();
388 if (UseCompressedOops) {
389 oop_store((narrowOop*)addr, x);
390 } else {
391 oop_store((oop*)addr, x);
392 }
393 OrderAccess::fence();
394 UNSAFE_END
395
396 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
397 UnsafeWrapper("Unsafe_SetOrderedLong");
398 #if defined(SPARC) || defined(X86)
399 // Sparc and X86 have atomic jlong (8 bytes) instructions
400 SET_FIELD_VOLATILE(obj, offset, jlong, x);
401 #else
402 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
403 {
404 if (VM_Version::supports_cx8()) {
405 SET_FIELD_VOLATILE(obj, offset, jlong, x);
406 }
407 else {
408 Handle p (THREAD, JNIHandles::resolve(obj));
409 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
410 ObjectLocker ol(p, THREAD);
411 *addr = x;
412 }
413 }
414 #endif
415 UNSAFE_END
416
417 ////// Data in the C heap.
418
419 // Note: These do not throw NullPointerException for bad pointers.
420 // They just crash. Only a oop base pointer can generate a NullPointerException.
421 //
422 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
423 \
424 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
425 UnsafeWrapper("Unsafe_GetNative"#Type); \
426 void* p = addr_from_java(addr); \
427 JavaThread* t = JavaThread::current(); \
428 t->set_doing_unsafe_access(true); \
429 java_type x = *(volatile native_type*)p; \
430 t->set_doing_unsafe_access(false); \
431 return x; \
432 UNSAFE_END \
433 \
434 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
435 UnsafeWrapper("Unsafe_SetNative"#Type); \
436 JavaThread* t = JavaThread::current(); \
437 t->set_doing_unsafe_access(true); \
438 void* p = addr_from_java(addr); \
439 *(volatile native_type*)p = x; \
440 t->set_doing_unsafe_access(false); \
441 UNSAFE_END \
442 \
443 // END DEFINE_GETSETNATIVE.
444
445 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
446 DEFINE_GETSETNATIVE(jshort, Short, signed short);
447 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
448 DEFINE_GETSETNATIVE(jint, Int, jint);
449 // no long -- handled specially
450 DEFINE_GETSETNATIVE(jfloat, Float, float);
451 DEFINE_GETSETNATIVE(jdouble, Double, double);
452
453 #undef DEFINE_GETSETNATIVE
454
455 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
456 UnsafeWrapper("Unsafe_GetNativeLong");
457 JavaThread* t = JavaThread::current();
458 // We do it this way to avoid problems with access to heap using 64
459 // bit loads, as jlong in heap could be not 64-bit aligned, and on
460 // some CPUs (SPARC) it leads to SIGBUS.
461 t->set_doing_unsafe_access(true);
462 void* p = addr_from_java(addr);
463 jlong x;
464 if (((intptr_t)p & 7) == 0) {
465 // jlong is aligned, do a volatile access
466 x = *(volatile jlong*)p;
467 } else {
468 jlong_accessor acc;
469 acc.words[0] = ((volatile jint*)p)[0];
470 acc.words[1] = ((volatile jint*)p)[1];
471 x = acc.long_value;
472 }
473 t->set_doing_unsafe_access(false);
474 return x;
475 UNSAFE_END
476
477 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
478 UnsafeWrapper("Unsafe_SetNativeLong");
479 JavaThread* t = JavaThread::current();
480 // see comment for Unsafe_GetNativeLong
481 t->set_doing_unsafe_access(true);
482 void* p = addr_from_java(addr);
483 if (((intptr_t)p & 7) == 0) {
484 // jlong is aligned, do a volatile access
485 *(volatile jlong*)p = x;
486 } else {
487 jlong_accessor acc;
488 acc.long_value = x;
489 ((volatile jint*)p)[0] = acc.words[0];
490 ((volatile jint*)p)[1] = acc.words[1];
491 }
492 t->set_doing_unsafe_access(false);
493 UNSAFE_END
494
495
496 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
497 UnsafeWrapper("Unsafe_GetNativeAddress");
498 void* p = addr_from_java(addr);
499 return addr_to_java(*(void**)p);
500 UNSAFE_END
501
502 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
503 UnsafeWrapper("Unsafe_SetNativeAddress");
504 void* p = addr_from_java(addr);
505 *(void**)p = addr_from_java(x);
506 UNSAFE_END
507
508
509 ////// Allocation requests
510
511 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
512 UnsafeWrapper("Unsafe_AllocateInstance");
513 {
514 ThreadToNativeFromVM ttnfv(thread);
515 return env->AllocObject(cls);
516 }
517 UNSAFE_END
518
519 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
520 UnsafeWrapper("Unsafe_AllocateMemory");
521 size_t sz = (size_t)size;
522 if (sz != (julong)size || size < 0) {
523 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
524 }
525 if (sz == 0) {
526 return 0;
527 }
528 sz = round_to(sz, HeapWordSize);
529 void* x = os::malloc(sz);
530 if (x == NULL) {
531 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
532 }
533 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
534 return addr_to_java(x);
535 UNSAFE_END
536
537 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
538 UnsafeWrapper("Unsafe_ReallocateMemory");
539 void* p = addr_from_java(addr);
540 size_t sz = (size_t)size;
541 if (sz != (julong)size || size < 0) {
542 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
543 }
544 if (sz == 0) {
545 os::free(p);
546 return 0;
547 }
548 sz = round_to(sz, HeapWordSize);
549 void* x = (p == NULL) ? os::malloc(sz) : os::realloc(p, sz);
550 if (x == NULL) {
551 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
552 }
553 return addr_to_java(x);
554 UNSAFE_END
555
556 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
557 UnsafeWrapper("Unsafe_FreeMemory");
558 void* p = addr_from_java(addr);
559 if (p == NULL) {
560 return;
561 }
562 os::free(p);
563 UNSAFE_END
564
565 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
566 UnsafeWrapper("Unsafe_SetMemory");
567 size_t sz = (size_t)size;
568 if (sz != (julong)size || size < 0) {
569 THROW(vmSymbols::java_lang_IllegalArgumentException());
570 }
571 char* p = (char*) addr_from_java(addr);
572 Copy::fill_to_memory_atomic(p, sz, value);
573 UNSAFE_END
574
575 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
576 UnsafeWrapper("Unsafe_SetMemory");
577 size_t sz = (size_t)size;
578 if (sz != (julong)size || size < 0) {
579 THROW(vmSymbols::java_lang_IllegalArgumentException());
580 }
581 oop base = JNIHandles::resolve(obj);
582 void* p = index_oop_from_field_offset_long(base, offset);
583 Copy::fill_to_memory_atomic(p, sz, value);
584 UNSAFE_END
585
586 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
587 UnsafeWrapper("Unsafe_CopyMemory");
588 if (size == 0) {
589 return;
590 }
591 size_t sz = (size_t)size;
592 if (sz != (julong)size || size < 0) {
593 THROW(vmSymbols::java_lang_IllegalArgumentException());
594 }
595 void* src = addr_from_java(srcAddr);
596 void* dst = addr_from_java(dstAddr);
597 Copy::conjoint_memory_atomic(src, dst, sz);
598 UNSAFE_END
599
600 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
601 UnsafeWrapper("Unsafe_CopyMemory");
602 if (size == 0) {
603 return;
604 }
605 size_t sz = (size_t)size;
606 if (sz != (julong)size || size < 0) {
607 THROW(vmSymbols::java_lang_IllegalArgumentException());
608 }
609 oop srcp = JNIHandles::resolve(srcObj);
610 oop dstp = JNIHandles::resolve(dstObj);
611 if (dstp != NULL && !dstp->is_typeArray()) {
612 // NYI: This works only for non-oop arrays at present.
613 // Generalizing it would be reasonable, but requires card marking.
614 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
615 THROW(vmSymbols::java_lang_IllegalArgumentException());
616 }
617 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
618 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
619 Copy::conjoint_memory_atomic(src, dst, sz);
620 UNSAFE_END
621
622
623 ////// Random queries
624
625 // See comment at file start about UNSAFE_LEAF
626 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
627 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
628 UnsafeWrapper("Unsafe_AddressSize");
629 return sizeof(void*);
630 UNSAFE_END
631
632 // See comment at file start about UNSAFE_LEAF
633 //UNSAFE_LEAF(jint, Unsafe_PageSize())
634 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
635 UnsafeWrapper("Unsafe_PageSize");
636 return os::vm_page_size();
637 UNSAFE_END
638
639 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
640 if (field == NULL) {
641 THROW_0(vmSymbols::java_lang_NullPointerException());
642 }
643
644 oop reflected = JNIHandles::resolve_non_null(field);
645 oop mirror = java_lang_reflect_Field::clazz(reflected);
646 klassOop k = java_lang_Class::as_klassOop(mirror);
647 int slot = java_lang_reflect_Field::slot(reflected);
648 int modifiers = java_lang_reflect_Field::modifiers(reflected);
649
650 if (must_be_static >= 0) {
651 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
652 if (must_be_static != really_is_static) {
653 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
654 }
655 }
656
657 int offset = instanceKlass::cast(k)->offset_from_fields(slot);
658 return field_offset_from_byte_offset(offset);
659 }
660
661 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
662 UnsafeWrapper("Unsafe_ObjectFieldOffset");
663 return find_field_offset(field, 0, THREAD);
664 UNSAFE_END
665
666 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
667 UnsafeWrapper("Unsafe_StaticFieldOffset");
668 return find_field_offset(field, 1, THREAD);
669 UNSAFE_END
670
671 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
672 UnsafeWrapper("Unsafe_StaticFieldBase");
673 // Note: In this VM implementation, a field address is always a short
674 // offset from the base of a a klass metaobject. Thus, the full dynamic
675 // range of the return type is never used. However, some implementations
676 // might put the static field inside an array shared by many classes,
677 // or even at a fixed address, in which case the address could be quite
678 // large. In that last case, this function would return NULL, since
679 // the address would operate alone, without any base pointer.
680
681 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
682
683 oop reflected = JNIHandles::resolve_non_null(field);
684 oop mirror = java_lang_reflect_Field::clazz(reflected);
685 int modifiers = java_lang_reflect_Field::modifiers(reflected);
686
687 if ((modifiers & JVM_ACC_STATIC) == 0) {
688 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
689 }
690
691 return JNIHandles::make_local(env, java_lang_Class::as_klassOop(mirror));
692 UNSAFE_END
693
694 //@deprecated
695 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
696 UnsafeWrapper("Unsafe_FieldOffset");
697 // tries (but fails) to be polymorphic between static and non-static:
698 jlong offset = find_field_offset(field, -1, THREAD);
699 guarantee(offset == (jint)offset, "offset fits in 32 bits");
700 return (jint)offset;
701 UNSAFE_END
702
703 //@deprecated
704 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
705 UnsafeWrapper("Unsafe_StaticFieldBase");
706 if (clazz == NULL) {
707 THROW_0(vmSymbols::java_lang_NullPointerException());
708 }
709 return JNIHandles::make_local(env, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
710 UNSAFE_END
711
712 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz))
713 UnsafeWrapper("Unsafe_EnsureClassInitialized");
714 if (clazz == NULL) {
715 THROW(vmSymbols::java_lang_NullPointerException());
716 }
717 oop mirror = JNIHandles::resolve_non_null(clazz);
718 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(mirror));
719 if (k != NULL) {
720 k->initialize(CHECK);
721 }
722 UNSAFE_END
723
724 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
725 if (acls == NULL) {
726 THROW(vmSymbols::java_lang_NullPointerException());
727 }
728 oop mirror = JNIHandles::resolve_non_null(acls);
729 klassOop k = java_lang_Class::as_klassOop(mirror);
730 if (k == NULL || !k->klass_part()->oop_is_array()) {
731 THROW(vmSymbols::java_lang_InvalidClassException());
732 } else if (k->klass_part()->oop_is_objArray()) {
733 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
734 scale = heapOopSize;
735 } else if (k->klass_part()->oop_is_typeArray()) {
736 typeArrayKlass* tak = typeArrayKlass::cast(k);
737 base = tak->array_header_in_bytes();
738 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
739 scale = (1 << tak->log2_element_size());
740 } else {
741 ShouldNotReachHere();
742 }
743 }
744
745 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
746 UnsafeWrapper("Unsafe_ArrayBaseOffset");
747 int base, scale;
748 getBaseAndScale(base, scale, acls, CHECK_0);
749 return field_offset_from_byte_offset(base);
750 UNSAFE_END
751
752
753 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
754 UnsafeWrapper("Unsafe_ArrayIndexScale");
755 int base, scale;
756 getBaseAndScale(base, scale, acls, CHECK_0);
757 // This VM packs both fields and array elements down to the byte.
758 // But watch out: If this changes, so that array references for
759 // a given primitive type (say, T_BOOLEAN) use different memory units
760 // than fields, this method MUST return zero for such arrays.
761 // For example, the VM used to store sub-word sized fields in full
762 // words in the object layout, so that accessors like getByte(Object,int)
763 // did not really do what one might expect for arrays. Therefore,
764 // this function used to report a zero scale factor, so that the user
765 // would know not to attempt to access sub-word array elements.
766 // // Code for unpacked fields:
767 // if (scale < wordSize) return 0;
768
769 // The following allows for a pretty general fieldOffset cookie scheme,
770 // but requires it to be linear in byte offset.
771 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
772 UNSAFE_END
773
774
775 static inline void throw_new(JNIEnv *env, const char *ename) {
776 char buf[100];
777 strcpy(buf, "java/lang/");
778 strcat(buf, ename);
779 jclass cls = env->FindClass(buf);
780 char* msg = NULL;
781 env->ThrowNew(cls, msg);
782 }
783
784 static jclass Unsafe_DefineClass(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
785 {
786 // Code lifted from JDK 1.3 ClassLoader.c
787
788 jbyte *body;
789 char *utfName;
790 jclass result = 0;
791 char buf[128];
792
793 if (UsePerfData) {
794 ClassLoader::unsafe_defineClassCallCounter()->inc();
795 }
796
797 if (data == NULL) {
798 throw_new(env, "NullPointerException");
799 return 0;
800 }
801
802 /* Work around 4153825. malloc crashes on Solaris when passed a
803 * negative size.
804 */
805 if (length < 0) {
806 throw_new(env, "ArrayIndexOutOfBoundsException");
807 return 0;
808 }
809
810 body = NEW_C_HEAP_ARRAY(jbyte, length);
811
812 if (body == 0) {
813 throw_new(env, "OutOfMemoryError");
814 return 0;
815 }
816
817 env->GetByteArrayRegion(data, offset, length, body);
818
819 if (env->ExceptionOccurred())
820 goto free_body;
821
822 if (name != NULL) {
823 uint len = env->GetStringUTFLength(name);
824 int unicode_len = env->GetStringLength(name);
825 if (len >= sizeof(buf)) {
826 utfName = NEW_C_HEAP_ARRAY(char, len + 1);
827 if (utfName == NULL) {
828 throw_new(env, "OutOfMemoryError");
829 goto free_body;
830 }
831 } else {
832 utfName = buf;
833 }
834 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
835 //VerifyFixClassname(utfName);
836 for (uint i = 0; i < len; i++) {
837 if (utfName[i] == '.') utfName[i] = '/';
838 }
839 } else {
840 utfName = NULL;
841 }
842
843 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
844
845 if (utfName && utfName != buf)
846 FREE_C_HEAP_ARRAY(char, utfName);
847
848 free_body:
849 FREE_C_HEAP_ARRAY(jbyte, body);
850 return result;
851 }
852 }
853
854
855 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
856 UnsafeWrapper("Unsafe_DefineClass");
857 {
858 ThreadToNativeFromVM ttnfv(thread);
859
860 int depthFromDefineClass0 = 1;
861 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
862 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
863 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
864
865 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
866 }
867 UNSAFE_END
868
869
870 UNSAFE_ENTRY(jclass, Unsafe_DefineClass1(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
871 UnsafeWrapper("Unsafe_DefineClass");
872 {
873 ThreadToNativeFromVM ttnfv(thread);
874
875 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
876 }
877 UNSAFE_END
878
879 #define DAC_Args CLS"[B["OBJ
880 // define a class but do not make it known to the class loader or system dictionary
881 // - host_class: supplies context for linkage, access control, protection domain, and class loader
882 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
883 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
884
885 // When you load an anonymous class U, it works as if you changed its name just before loading,
886 // to a name that you will never use again. Since the name is lost, no other class can directly
887 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
888 // through java.lang.Class methods like Class.newInstance.
889
890 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
891 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
892 // An anonymous class also has special privileges to access any member of its host class.
893 // This is the main reason why this loading operation is unsafe. The purpose of this is to
894 // allow language implementations to simulate "open classes"; a host class in effect gets
895 // new code when an anonymous class is loaded alongside it. A less convenient but more
896 // standard way to do this is with reflection, which can also be set to ignore access
897 // restrictions.
898
899 // Access into an anonymous class is possible only through reflection. Therefore, there
900 // are no special access rules for calling into an anonymous class. The relaxed access
901 // rule for the host class is applied in the opposite direction: A host class reflectively
902 // access one of its anonymous classes.
903
904 // If you load the same bytecodes twice, you get two different classes. You can reload
905 // the same bytecodes with or without varying CP patches.
906
907 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
908 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
909 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
910
911 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
912 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
913 // It is not possible for a named class, or an older anonymous class, to refer by
914 // name (via its CP) to a newer anonymous class.
915
916 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
917 // or type descriptors used in the loaded anonymous class.
918
919 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
920 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
921 // be changed to println(greeting), where greeting is an arbitrary object created before
922 // the anonymous class is loaded. This is useful in dynamic languages, in which
923 // various kinds of metaobjects must be introduced as constants into bytecode.
924 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
925 // not just a literal string. For such ldc instructions, the verifier uses the
926 // type Object instead of String, if the loaded constant is not in fact a String.
927
928 static oop
929 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
930 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
931 HeapWord* *temp_alloc,
932 TRAPS) {
933
934 if (UsePerfData) {
935 ClassLoader::unsafe_defineClassCallCounter()->inc();
936 }
937
938 if (data == NULL) {
939 THROW_0(vmSymbols::java_lang_NullPointerException());
940 }
941
942 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
943 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
944 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length);
945 if (body == NULL) {
946 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
947 }
948
949 // caller responsible to free it:
950 (*temp_alloc) = body;
951
952 {
953 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
954 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
955 }
956
957 u1* class_bytes = (u1*) body;
958 int class_bytes_length = (int) length;
959 if (class_bytes_length < 0) class_bytes_length = 0;
960 if (class_bytes == NULL
961 || host_class == NULL
962 || length != class_bytes_length)
963 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
964
965 objArrayHandle cp_patches_h;
966 if (cp_patches_jh != NULL) {
967 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
968 if (!p->is_objArray())
969 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
970 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
971 }
972
973 KlassHandle host_klass(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(host_class)));
974 const char* host_source = host_klass->external_name();
975 Handle host_loader(THREAD, host_klass->class_loader());
976 Handle host_domain(THREAD, host_klass->protection_domain());
977
978 GrowableArray<Handle>* cp_patches = NULL;
979 if (cp_patches_h.not_null()) {
980 int alen = cp_patches_h->length();
981 for (int i = alen-1; i >= 0; i--) {
982 oop p = cp_patches_h->obj_at(i);
983 if (p != NULL) {
984 Handle patch(THREAD, p);
985 if (cp_patches == NULL)
986 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
987 cp_patches->at_put(i, patch);
988 }
989 }
990 }
991
992 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
993
994 instanceKlassHandle anon_klass;
995 {
996 Symbol* no_class_name = NULL;
997 klassOop anonk = SystemDictionary::parse_stream(no_class_name,
998 host_loader, host_domain,
999 &st, host_klass, cp_patches,
1000 CHECK_NULL);
1001 if (anonk == NULL) return NULL;
1002 anon_klass = instanceKlassHandle(THREAD, anonk);
1003 }
1004
1005 // let caller initialize it as needed...
1006
1007 return anon_klass->java_mirror();
1008 }
1009
1010 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1011 {
1012 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1013 ResourceMark rm(THREAD);
1014
1015 HeapWord* temp_alloc = NULL;
1016
1017 jobject res_jh = NULL;
1018
1019 { oop res_oop = Unsafe_DefineAnonymousClass_impl(env,
1020 host_class, data, cp_patches_jh,
1021 &temp_alloc, THREAD);
1022 if (res_oop != NULL)
1023 res_jh = JNIHandles::make_local(env, res_oop);
1024 }
1025
1026 // try/finally clause:
1027 if (temp_alloc != NULL) {
1028 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc);
1029 }
1030
1031 return (jclass) res_jh;
1032 }
1033 UNSAFE_END
1034
1035
1036
1037 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1038 UnsafeWrapper("Unsafe_MonitorEnter");
1039 {
1040 if (jobj == NULL) {
1041 THROW(vmSymbols::java_lang_NullPointerException());
1042 }
1043 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1044 ObjectSynchronizer::jni_enter(obj, CHECK);
1045 }
1046 UNSAFE_END
1047
1048
1049 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1050 UnsafeWrapper("Unsafe_TryMonitorEnter");
1051 {
1052 if (jobj == NULL) {
1053 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1054 }
1055 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1056 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1057 return (res ? JNI_TRUE : JNI_FALSE);
1058 }
1059 UNSAFE_END
1060
1061
1062 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1063 UnsafeWrapper("Unsafe_MonitorExit");
1064 {
1065 if (jobj == NULL) {
1066 THROW(vmSymbols::java_lang_NullPointerException());
1067 }
1068 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1069 ObjectSynchronizer::jni_exit(obj(), CHECK);
1070 }
1071 UNSAFE_END
1072
1073
1074 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1075 UnsafeWrapper("Unsafe_ThrowException");
1076 {
1077 ThreadToNativeFromVM ttnfv(thread);
1078 env->Throw(thr);
1079 }
1080 UNSAFE_END
1081
1082 // JSR166 ------------------------------------------------------------------
1083
1084 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1085 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1086 oop x = JNIHandles::resolve(x_h);
1087 oop e = JNIHandles::resolve(e_h);
1088 oop p = JNIHandles::resolve(obj);
1089 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1090 if (UseCompressedOops) {
1091 update_barrier_set_pre((narrowOop*)addr, e);
1092 } else {
1093 update_barrier_set_pre((oop*)addr, e);
1094 }
1095 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e);
1096 jboolean success = (res == e);
1097 if (success)
1098 update_barrier_set((void*)addr, x);
1099 return success;
1100 UNSAFE_END
1101
1102 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1103 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1104 oop p = JNIHandles::resolve(obj);
1105 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1106 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1107 UNSAFE_END
1108
1109 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1110 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1111 Handle p (THREAD, JNIHandles::resolve(obj));
1112 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1113 if (VM_Version::supports_cx8())
1114 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1115 else {
1116 jboolean success = false;
1117 ObjectLocker ol(p, THREAD);
1118 if (*addr == e) { *addr = x; success = true; }
1119 return success;
1120 }
1121 UNSAFE_END
1122
1123 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1124 UnsafeWrapper("Unsafe_Park");
1125 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1126 JavaThreadParkedState jtps(thread, time != 0);
1127 thread->parker()->park(isAbsolute != 0, time);
1128 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1129 UNSAFE_END
1130
1131 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1132 UnsafeWrapper("Unsafe_Unpark");
1133 Parker* p = NULL;
1134 if (jthread != NULL) {
1135 oop java_thread = JNIHandles::resolve_non_null(jthread);
1136 if (java_thread != NULL) {
1137 jlong lp = java_lang_Thread::park_event(java_thread);
1138 if (lp != 0) {
1139 // This cast is OK even though the jlong might have been read
1140 // non-atomically on 32bit systems, since there, one word will
1141 // always be zero anyway and the value set is always the same
1142 p = (Parker*)addr_from_java(lp);
1143 } else {
1144 // Grab lock if apparently null or using older version of library
1145 MutexLocker mu(Threads_lock);
1146 java_thread = JNIHandles::resolve_non_null(jthread);
1147 if (java_thread != NULL) {
1148 JavaThread* thr = java_lang_Thread::thread(java_thread);
1149 if (thr != NULL) {
1150 p = thr->parker();
1151 if (p != NULL) { // Bind to Java thread for next time.
1152 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1153 }
1154 }
1155 }
1156 }
1157 }
1158 }
1159 if (p != NULL) {
1160 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1161 p->unpark();
1162 }
1163 UNSAFE_END
1164
1165 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1166 UnsafeWrapper("Unsafe_Loadavg");
1167 const int max_nelem = 3;
1168 double la[max_nelem];
1169 jint ret;
1170
1171 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1172 assert(a->is_typeArray(), "must be type array");
1173
1174 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1175 ThreadToNativeFromVM ttnfv(thread);
1176 throw_new(env, "ArrayIndexOutOfBoundsException");
1177 return -1;
1178 }
1179
1180 ret = os::loadavg(la, nelem);
1181 if (ret == -1) return -1;
1182
1183 // if successful, ret is the number of samples actually retrieved.
1184 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1185 switch(ret) {
1186 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1187 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1188 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1189 }
1190 return ret;
1191 UNSAFE_END
1192
1193 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1194 UnsafeWrapper("Unsafe_PrefetchRead");
1195 oop p = JNIHandles::resolve(obj);
1196 void* addr = index_oop_from_field_offset_long(p, 0);
1197 Prefetch::read(addr, (intx)offset);
1198 UNSAFE_END
1199
1200 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1201 UnsafeWrapper("Unsafe_PrefetchWrite");
1202 oop p = JNIHandles::resolve(obj);
1203 void* addr = index_oop_from_field_offset_long(p, 0);
1204 Prefetch::write(addr, (intx)offset);
1205 UNSAFE_END
1206
1207
1208 /// JVM_RegisterUnsafeMethods
1209
1210 #define ADR "J"
1211
1212 #define LANG "Ljava/lang/"
1213
1214 #define OBJ LANG"Object;"
1215 #define CLS LANG"Class;"
1216 #define CTR LANG"reflect/Constructor;"
1217 #define FLD LANG"reflect/Field;"
1218 #define MTH LANG"reflect/Method;"
1219 #define THR LANG"Throwable;"
1220
1221 #define DC0_Args LANG"String;[BII"
1222 #define DC1_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1223
1224 #define CC (char*) /*cast a literal from (const char*)*/
1225 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1226
1227 // define deprecated accessors for compabitility with 1.4.0
1228 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1229 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1230 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1231
1232 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1233 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1234 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1235 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1236
1237 // Note: In 1.5.0, there are volatile versions too
1238 #define DECLARE_GETSETOOP(Boolean, Z) \
1239 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1240 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1241 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1242 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1243
1244
1245 #define DECLARE_GETSETNATIVE(Byte, B) \
1246 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1247 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1248
1249
1250
1251 // %%% These are temporarily supported until the SDK sources
1252 // contain the necessarily updated Unsafe.java.
1253 static JNINativeMethod methods_140[] = {
1254
1255 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)},
1256 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)},
1257
1258 DECLARE_GETSETOOP_140(Boolean, Z),
1259 DECLARE_GETSETOOP_140(Byte, B),
1260 DECLARE_GETSETOOP_140(Short, S),
1261 DECLARE_GETSETOOP_140(Char, C),
1262 DECLARE_GETSETOOP_140(Int, I),
1263 DECLARE_GETSETOOP_140(Long, J),
1264 DECLARE_GETSETOOP_140(Float, F),
1265 DECLARE_GETSETOOP_140(Double, D),
1266
1267 DECLARE_GETSETNATIVE(Byte, B),
1268 DECLARE_GETSETNATIVE(Short, S),
1269 DECLARE_GETSETNATIVE(Char, C),
1270 DECLARE_GETSETNATIVE(Int, I),
1271 DECLARE_GETSETNATIVE(Long, J),
1272 DECLARE_GETSETNATIVE(Float, F),
1273 DECLARE_GETSETNATIVE(Double, D),
1274
1275 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1276 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1277
1278 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1279 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1280 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1281 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1282 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1283
1284 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, //deprecated
1285 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, //deprecated
1286 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1287 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1288 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1289 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1290 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1291
1292 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1293 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1294 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1295 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1296 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1297 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1298 };
1299
1300 // These are the old methods prior to the JSR 166 changes in 1.5.0
1301 static JNINativeMethod methods_141[] = {
1302
1303 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1304 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1305
1306 DECLARE_GETSETOOP_141(Boolean, Z),
1307 DECLARE_GETSETOOP_141(Byte, B),
1308 DECLARE_GETSETOOP_141(Short, S),
1309 DECLARE_GETSETOOP_141(Char, C),
1310 DECLARE_GETSETOOP_141(Int, I),
1311 DECLARE_GETSETOOP_141(Long, J),
1312 DECLARE_GETSETOOP_141(Float, F),
1313 DECLARE_GETSETOOP_141(Double, D),
1314
1315 DECLARE_GETSETNATIVE(Byte, B),
1316 DECLARE_GETSETNATIVE(Short, S),
1317 DECLARE_GETSETNATIVE(Char, C),
1318 DECLARE_GETSETNATIVE(Int, I),
1319 DECLARE_GETSETNATIVE(Long, J),
1320 DECLARE_GETSETNATIVE(Float, F),
1321 DECLARE_GETSETNATIVE(Double, D),
1322
1323 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1324 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1325
1326 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1327 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1328 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1329 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1330 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1331
1332 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1333 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1334 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1335 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1336 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1337 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1338 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1339 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1340
1341 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1342 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1343 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1344 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1345 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1346 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1347
1348 };
1349
1350 // These are the old methods prior to the JSR 166 changes in 1.6.0
1351 static JNINativeMethod methods_15[] = {
1352
1353 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1354 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1355 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1356 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1357
1358
1359 DECLARE_GETSETOOP(Boolean, Z),
1360 DECLARE_GETSETOOP(Byte, B),
1361 DECLARE_GETSETOOP(Short, S),
1362 DECLARE_GETSETOOP(Char, C),
1363 DECLARE_GETSETOOP(Int, I),
1364 DECLARE_GETSETOOP(Long, J),
1365 DECLARE_GETSETOOP(Float, F),
1366 DECLARE_GETSETOOP(Double, D),
1367
1368 DECLARE_GETSETNATIVE(Byte, B),
1369 DECLARE_GETSETNATIVE(Short, S),
1370 DECLARE_GETSETNATIVE(Char, C),
1371 DECLARE_GETSETNATIVE(Int, I),
1372 DECLARE_GETSETNATIVE(Long, J),
1373 DECLARE_GETSETNATIVE(Float, F),
1374 DECLARE_GETSETNATIVE(Double, D),
1375
1376 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1377 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1378
1379 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1380 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1381 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1382 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1383 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1384
1385 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1386 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1387 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1388 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1389 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1390 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1391 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1392 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1393
1394 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1395 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1396 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1397 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1398 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1399 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1400 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1401 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1402 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1403 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1404 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1405
1406 };
1407
1408 // These are the correct methods, moving forward:
1409 static JNINativeMethod methods[] = {
1410
1411 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1412 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1413 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1414 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1415
1416
1417 DECLARE_GETSETOOP(Boolean, Z),
1418 DECLARE_GETSETOOP(Byte, B),
1419 DECLARE_GETSETOOP(Short, S),
1420 DECLARE_GETSETOOP(Char, C),
1421 DECLARE_GETSETOOP(Int, I),
1422 DECLARE_GETSETOOP(Long, J),
1423 DECLARE_GETSETOOP(Float, F),
1424 DECLARE_GETSETOOP(Double, D),
1425
1426 DECLARE_GETSETNATIVE(Byte, B),
1427 DECLARE_GETSETNATIVE(Short, S),
1428 DECLARE_GETSETNATIVE(Char, C),
1429 DECLARE_GETSETNATIVE(Int, I),
1430 DECLARE_GETSETNATIVE(Long, J),
1431 DECLARE_GETSETNATIVE(Float, F),
1432 DECLARE_GETSETNATIVE(Double, D),
1433
1434 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1435 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1436
1437 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1438 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1439 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1440 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1441 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1442
1443 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1444 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1445 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1446 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1447 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1448 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1449 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1450 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1451
1452 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1453 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1454 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1455 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1456 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1457 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
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"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1463 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1464 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1465 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1466 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1467
1468 // {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)},
1469
1470 // {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1471 // {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1472 // {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1473 // {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1474
1475 };
1476
1477 JNINativeMethod loadavg_method[] = {
1478 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1479 };
1480
1481 JNINativeMethod prefetch_methods[] = {
1482 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1483 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1484 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1485 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1486 };
1487
1488 JNINativeMethod memcopy_methods[] = {
1489 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1490 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1491 };
1492
1493 JNINativeMethod memcopy_methods_15[] = {
1494 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1495 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1496 };
1497
1498 JNINativeMethod anonk_methods[] = {
1499 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1500 };
1501
1502 #undef CC
1503 #undef FN_PTR
1504
1505 #undef ADR
1506 #undef LANG
1507 #undef OBJ
1508 #undef CLS
1509 #undef CTR
1510 #undef FLD
1511 #undef MTH
1512 #undef THR
1513 #undef DC0_Args
1514 #undef DC1_Args
1515
1516 #undef DECLARE_GETSETOOP
1517 #undef DECLARE_GETSETNATIVE
1518
1519
1520 // This one function is exported, used by NativeLookup.
1521 // The Unsafe_xxx functions above are called only from the interpreter.
1522 // The optimizer looks at names and signatures to recognize
1523 // individual functions.
1524
1525 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1526 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1527 {
1528 ThreadToNativeFromVM ttnfv(thread);
1529 {
1530 env->RegisterNatives(unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1531 if (env->ExceptionOccurred()) {
1532 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1533 tty->print_cr("Warning: SDK 1.6 Unsafe.loadavg not found.");
1534 }
1535 env->ExceptionClear();
1536 }
1537 }
1538 {
1539 env->RegisterNatives(unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1540 if (env->ExceptionOccurred()) {
1541 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1542 tty->print_cr("Warning: SDK 1.6 Unsafe.prefetchRead/Write not found.");
1543 }
1544 env->ExceptionClear();
1545 }
1546 }
1547 {
1548 env->RegisterNatives(unsafecls, memcopy_methods, sizeof(memcopy_methods)/sizeof(JNINativeMethod));
1549 if (env->ExceptionOccurred()) {
1550 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1551 tty->print_cr("Warning: SDK 1.7 Unsafe.copyMemory not found.");
1552 }
1553 env->ExceptionClear();
1554 env->RegisterNatives(unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1555 if (env->ExceptionOccurred()) {
1556 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1557 tty->print_cr("Warning: SDK 1.5 Unsafe.copyMemory not found.");
1558 }
1559 env->ExceptionClear();
1560 }
1561 }
1562 }
1563 if (AnonymousClasses) {
1564 env->RegisterNatives(unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1565 if (env->ExceptionOccurred()) {
1566 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1567 tty->print_cr("Warning: SDK 1.7 Unsafe.defineClass (anonymous version) not found.");
1568 }
1569 env->ExceptionClear();
1570 }
1571 }
1572 int status = env->RegisterNatives(unsafecls, methods, sizeof(methods)/sizeof(JNINativeMethod));
1573 if (env->ExceptionOccurred()) {
1574 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1575 tty->print_cr("Warning: SDK 1.6 version of Unsafe not found.");
1576 }
1577 env->ExceptionClear();
1578 // %%% For now, be backward compatible with an older class:
1579 status = env->RegisterNatives(unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1580 }
1581 if (env->ExceptionOccurred()) {
1582 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1583 tty->print_cr("Warning: SDK 1.5 version of Unsafe not found.");
1584 }
1585 env->ExceptionClear();
1586 // %%% For now, be backward compatible with an older class:
1587 status = env->RegisterNatives(unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1588 }
1589 if (env->ExceptionOccurred()) {
1590 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1591 tty->print_cr("Warning: SDK 1.4.1 version of Unsafe not found.");
1592 }
1593 env->ExceptionClear();
1594 // %%% For now, be backward compatible with an older class:
1595 status = env->RegisterNatives(unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1596 }
1597 guarantee(status == 0, "register unsafe natives");
1598 }
1599 JVM_END