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 #ifndef SERIALGC
28 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
29 #endif // SERIALGC
30 #include "memory/allocation.inline.hpp"
31 #include "prims/jni.h"
32 #include "prims/jvm.h"
33 #include "runtime/globals.hpp"
34 #include "runtime/interfaceSupport.hpp"
35 #include "runtime/reflection.hpp"
36 #include "runtime/synchronizer.hpp"
37 #include "services/threadService.hpp"
38 #include "utilities/copy.hpp"
39 #include "utilities/dtrace.hpp"
40
41 /*
42 * Implementation of class sun.misc.Unsafe
43 */
44
45 #ifndef USDT2
46 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long);
47 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t);
48 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t);
49 #endif /* !USDT2 */
50
51 #define MAX_OBJECT_SIZE \
52 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
53 + ((julong)max_jint * sizeof(double)) )
54
55
56 #define UNSAFE_ENTRY(result_type, header) \
57 JVM_ENTRY(result_type, header)
58
59 // Can't use UNSAFE_LEAF because it has the signature of a straight
60 // call into the runtime (just like JVM_LEAF, funny that) but it's
61 // called like a Java Native and thus the wrapper built for it passes
62 // arguments like a JNI call. It expects those arguments to be popped
63 // from the stack on Intel like all good JNI args are, and adjusts the
64 // stack according. Since the JVM_LEAF call expects no extra
65 // arguments the stack isn't popped in the C code, is pushed by the
66 // wrapper and we get sick.
67 //#define UNSAFE_LEAF(result_type, header) \
68 // JVM_LEAF(result_type, header)
69
70 #define UNSAFE_END JVM_END
71
72 #define UnsafeWrapper(arg) /*nothing, for the present*/
73
74
75 inline void* addr_from_java(jlong addr) {
76 // This assert fails in a variety of ways on 32-bit systems.
77 // It is impossible to predict whether native code that converts
78 // pointers to longs will sign-extend or zero-extend the addresses.
79 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
80 return (void*)(uintptr_t)addr;
81 }
82
83 inline jlong addr_to_java(void* p) {
84 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
85 return (uintptr_t)p;
86 }
87
88
89 // Note: The VM's obj_field and related accessors use byte-scaled
90 // ("unscaled") offsets, just as the unsafe methods do.
91
92 // However, the method Unsafe.fieldOffset explicitly declines to
93 // guarantee this. The field offset values manipulated by the Java user
94 // through the Unsafe API are opaque cookies that just happen to be byte
95 // offsets. We represent this state of affairs by passing the cookies
96 // through conversion functions when going between the VM and the Unsafe API.
97 // The conversion functions just happen to be no-ops at present.
98
99 inline jlong field_offset_to_byte_offset(jlong field_offset) {
100 return field_offset;
101 }
102
103 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
104 return byte_offset;
105 }
106
107 inline jint invocation_key_from_method_slot(jint slot) {
108 return slot;
109 }
110
111 inline jint invocation_key_to_method_slot(jint key) {
112 return key;
113 }
114
115 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
116 jlong byte_offset = field_offset_to_byte_offset(field_offset);
117 // Don't allow unsafe to be used to read or write the header word of oops
118 assert(p == NULL || field_offset >= oopDesc::header_size(), "offset must be outside of header");
119 #ifdef ASSERT
120 if (p != NULL) {
121 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
122 if (byte_offset == (jint)byte_offset) {
123 void* ptr_plus_disp = (address)p + byte_offset;
124 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
125 "raw [ptr+disp] must be consistent with oop::field_base");
126 }
127 }
128 #endif
129 if (sizeof(char*) == sizeof(jint)) // (this constant folds!)
130 return (address)p + (jint) byte_offset;
131 else
132 return (address)p + byte_offset;
133 }
134
135 // Externally callable versions:
136 // (Use these in compiler intrinsics which emulate unsafe primitives.)
137 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
138 return field_offset;
139 }
140 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
141 return byte_offset;
142 }
143 jint Unsafe_invocation_key_from_method_slot(jint slot) {
144 return invocation_key_from_method_slot(slot);
145 }
146 jint Unsafe_invocation_key_to_method_slot(jint key) {
147 return invocation_key_to_method_slot(key);
148 }
149
150
151 ///// Data in the Java heap.
152
153 #define GET_FIELD(obj, offset, type_name, v) \
154 oop p = JNIHandles::resolve(obj); \
155 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
156
157 #define SET_FIELD(obj, offset, type_name, x) \
158 oop p = JNIHandles::resolve(obj); \
159 *(type_name*)index_oop_from_field_offset_long(p, offset) = x
160
161 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
162 oop p = JNIHandles::resolve(obj); \
163 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
164
165 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
166 oop p = JNIHandles::resolve(obj); \
167 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x);
168
169 // Macros for oops that check UseCompressedOops
170
171 #define GET_OOP_FIELD(obj, offset, v) \
172 oop p = JNIHandles::resolve(obj); \
173 oop v; \
174 if (UseCompressedOops) { \
175 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
176 v = oopDesc::decode_heap_oop(n); \
177 } else { \
178 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
179 }
180
181 #define GET_OOP_FIELD_VOLATILE(obj, offset, v) \
182 oop p = JNIHandles::resolve(obj); \
183 volatile oop v; \
184 if (UseCompressedOops) { \
185 volatile narrowOop n = *(volatile narrowOop*)index_oop_from_field_offset_long(p, offset); \
186 v = oopDesc::decode_heap_oop(n); \
187 } else { \
188 v = *(volatile oop*)index_oop_from_field_offset_long(p, offset); \
189 } \
190 OrderAccess::acquire();
191
192
193 // Get/SetObject must be special-cased, since it works with handles.
194
195 // The xxx140 variants for backward compatibility do not allow a full-width offset.
196 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
197 UnsafeWrapper("Unsafe_GetObject");
198 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
199 GET_OOP_FIELD(obj, offset, v)
200 jobject ret = JNIHandles::make_local(env, v);
201 #ifndef SERIALGC
202 // We could be accessing the referent field in a reference
203 // object. If G1 is enabled then we need to register a non-null
204 // referent with the SATB barrier.
205 if (UseG1GC) {
206 bool needs_barrier = false;
207
208 if (ret != NULL) {
209 if (offset == java_lang_ref_Reference::referent_offset) {
210 oop o = JNIHandles::resolve_non_null(obj);
211 klassOop k = o->klass();
212 if (instanceKlass::cast(k)->reference_type() != REF_NONE) {
213 assert(instanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
214 needs_barrier = true;
215 }
216 }
217 }
218
219 if (needs_barrier) {
220 oop referent = JNIHandles::resolve(ret);
221 G1SATBCardTableModRefBS::enqueue(referent);
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 GET_OOP_FIELD(obj, offset, v)
258 jobject ret = JNIHandles::make_local(env, v);
259 #ifndef SERIALGC
260 // We could be accessing the referent field in a reference
261 // object. If G1 is enabled then we need to register non-null
262 // referent with the SATB barrier.
263 if (UseG1GC) {
264 bool needs_barrier = false;
265
266 if (ret != NULL) {
267 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) {
268 oop o = JNIHandles::resolve(obj);
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");
272 needs_barrier = true;
273 }
274 }
275 }
276
277 if (needs_barrier) {
278 oop referent = JNIHandles::resolve(ret);
279 G1SATBCardTableModRefBS::enqueue(referent);
280 }
281 }
282 #endif // SERIALGC
283 return ret;
284 UNSAFE_END
285
286 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
287 UnsafeWrapper("Unsafe_SetObject");
288 oop x = JNIHandles::resolve(x_h);
289 oop p = JNIHandles::resolve(obj);
290 if (UseCompressedOops) {
291 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
292 } else {
293 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
294 }
295 UNSAFE_END
296
297 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
298 UnsafeWrapper("Unsafe_GetObjectVolatile");
299 GET_OOP_FIELD_VOLATILE(obj, offset, v)
300 return JNIHandles::make_local(env, v);
301 UNSAFE_END
302
303 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
304 UnsafeWrapper("Unsafe_SetObjectVolatile");
305 {
306 // Catch VolatileCallSite.target stores (via
307 // CallSite.setTargetVolatile) and check call site dependencies.
308 oop p = JNIHandles::resolve(obj);
309 if ((offset == java_lang_invoke_CallSite::target_offset_in_bytes()) && p->is_a(SystemDictionary::CallSite_klass())) {
310 Handle call_site (THREAD, p);
311 Handle method_handle(THREAD, JNIHandles::resolve(x_h));
312 assert(call_site ->is_a(SystemDictionary::CallSite_klass()), "must be");
313 assert(method_handle->is_a(SystemDictionary::MethodHandle_klass()), "must be");
314 {
315 // Walk all nmethods depending on this call site.
316 MutexLocker mu(Compile_lock, thread);
317 Universe::flush_dependents_on(call_site(), method_handle());
318 }
319 }
320 }
321 oop x = JNIHandles::resolve(x_h);
322 oop p = JNIHandles::resolve(obj);
323 void* addr = index_oop_from_field_offset_long(p, offset);
324 OrderAccess::release();
325 if (UseCompressedOops) {
326 oop_store((narrowOop*)addr, x);
327 } else {
328 oop_store((oop*)addr, x);
329 }
330 OrderAccess::fence();
331 UNSAFE_END
332
333 #if defined(SPARC) || defined(X86)
334 // Sparc and X86 have atomic jlong (8 bytes) instructions
335
336 #else
337 // Keep old code for platforms which may not have atomic jlong (8 bytes) instructions
338
339 // Volatile long versions must use locks if !VM_Version::supports_cx8().
340 // support_cx8 is a surrogate for 'supports atomic long memory ops'.
341
342 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
343 UnsafeWrapper("Unsafe_GetLongVolatile");
344 {
345 if (VM_Version::supports_cx8()) {
346 GET_FIELD_VOLATILE(obj, offset, jlong, v);
347 return v;
348 }
349 else {
350 Handle p (THREAD, JNIHandles::resolve(obj));
351 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
352 ObjectLocker ol(p, THREAD);
353 jlong value = *addr;
354 return value;
355 }
356 }
357 UNSAFE_END
358
359 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
360 UnsafeWrapper("Unsafe_SetLongVolatile");
361 {
362 if (VM_Version::supports_cx8()) {
363 SET_FIELD_VOLATILE(obj, offset, jlong, x);
364 }
365 else {
366 Handle p (THREAD, JNIHandles::resolve(obj));
367 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
368 ObjectLocker ol(p, THREAD);
369 *addr = x;
370 }
371 }
372 UNSAFE_END
373
374 #endif // not SPARC and not X86
375
376 #define DEFINE_GETSETOOP(jboolean, Boolean) \
377 \
378 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
379 UnsafeWrapper("Unsafe_Get"#Boolean); \
380 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
381 GET_FIELD(obj, offset, jboolean, v); \
382 return v; \
383 UNSAFE_END \
384 \
385 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
386 UnsafeWrapper("Unsafe_Set"#Boolean); \
387 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
388 SET_FIELD(obj, offset, jboolean, x); \
389 UNSAFE_END \
390 \
391 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
392 UnsafeWrapper("Unsafe_Get"#Boolean); \
393 GET_FIELD(obj, offset, jboolean, v); \
394 return v; \
395 UNSAFE_END \
396 \
397 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
398 UnsafeWrapper("Unsafe_Set"#Boolean); \
399 SET_FIELD(obj, offset, jboolean, x); \
400 UNSAFE_END \
401 \
402 // END DEFINE_GETSETOOP.
403
404 DEFINE_GETSETOOP(jboolean, Boolean)
405 DEFINE_GETSETOOP(jbyte, Byte)
406 DEFINE_GETSETOOP(jshort, Short);
407 DEFINE_GETSETOOP(jchar, Char);
408 DEFINE_GETSETOOP(jint, Int);
409 DEFINE_GETSETOOP(jlong, Long);
410 DEFINE_GETSETOOP(jfloat, Float);
411 DEFINE_GETSETOOP(jdouble, Double);
412
413 #undef DEFINE_GETSETOOP
414
415 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
416 \
417 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
418 UnsafeWrapper("Unsafe_Get"#Boolean); \
419 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
420 return v; \
421 UNSAFE_END \
422 \
423 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
424 UnsafeWrapper("Unsafe_Set"#Boolean); \
425 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
426 UNSAFE_END \
427 \
428 // END DEFINE_GETSETOOP_VOLATILE.
429
430 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
431 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
432 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
433 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
434 DEFINE_GETSETOOP_VOLATILE(jint, Int);
435 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
436 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
437
438 #if defined(SPARC) || defined(X86)
439 // Sparc and X86 have atomic jlong (8 bytes) instructions
440 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
441 #endif
442
443 #undef DEFINE_GETSETOOP_VOLATILE
444
445 // The non-intrinsified versions of setOrdered just use setVolatile
446
447 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
448 UnsafeWrapper("Unsafe_SetOrderedInt");
449 SET_FIELD_VOLATILE(obj, offset, jint, x);
450 UNSAFE_END
451
452 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
453 UnsafeWrapper("Unsafe_SetOrderedObject");
454 oop x = JNIHandles::resolve(x_h);
455 oop p = JNIHandles::resolve(obj);
456 void* addr = index_oop_from_field_offset_long(p, offset);
457 OrderAccess::release();
458 if (UseCompressedOops) {
459 oop_store((narrowOop*)addr, x);
460 } else {
461 oop_store((oop*)addr, x);
462 }
463 OrderAccess::fence();
464 UNSAFE_END
465
466 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
467 UnsafeWrapper("Unsafe_SetOrderedLong");
468 #if defined(SPARC) || defined(X86)
469 // Sparc and X86 have atomic jlong (8 bytes) instructions
470 SET_FIELD_VOLATILE(obj, offset, jlong, x);
471 #else
472 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
473 {
474 if (VM_Version::supports_cx8()) {
475 SET_FIELD_VOLATILE(obj, offset, jlong, x);
476 }
477 else {
478 Handle p (THREAD, JNIHandles::resolve(obj));
479 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
480 ObjectLocker ol(p, THREAD);
481 *addr = x;
482 }
483 }
484 #endif
485 UNSAFE_END
486
487 ////// Data in the C heap.
488
489 // Note: These do not throw NullPointerException for bad pointers.
490 // They just crash. Only a oop base pointer can generate a NullPointerException.
491 //
492 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
493 \
494 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
495 UnsafeWrapper("Unsafe_GetNative"#Type); \
496 void* p = addr_from_java(addr); \
497 JavaThread* t = JavaThread::current(); \
498 t->set_doing_unsafe_access(true); \
499 java_type x = *(volatile native_type*)p; \
500 t->set_doing_unsafe_access(false); \
501 return x; \
502 UNSAFE_END \
503 \
504 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
505 UnsafeWrapper("Unsafe_SetNative"#Type); \
506 JavaThread* t = JavaThread::current(); \
507 t->set_doing_unsafe_access(true); \
508 void* p = addr_from_java(addr); \
509 *(volatile native_type*)p = x; \
510 t->set_doing_unsafe_access(false); \
511 UNSAFE_END \
512 \
513 // END DEFINE_GETSETNATIVE.
514
515 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
516 DEFINE_GETSETNATIVE(jshort, Short, signed short);
517 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
518 DEFINE_GETSETNATIVE(jint, Int, jint);
519 // no long -- handled specially
520 DEFINE_GETSETNATIVE(jfloat, Float, float);
521 DEFINE_GETSETNATIVE(jdouble, Double, double);
522
523 #undef DEFINE_GETSETNATIVE
524
525 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
526 UnsafeWrapper("Unsafe_GetNativeLong");
527 JavaThread* t = JavaThread::current();
528 // We do it this way to avoid problems with access to heap using 64
529 // bit loads, as jlong in heap could be not 64-bit aligned, and on
530 // some CPUs (SPARC) it leads to SIGBUS.
531 t->set_doing_unsafe_access(true);
532 void* p = addr_from_java(addr);
533 jlong x;
534 if (((intptr_t)p & 7) == 0) {
535 // jlong is aligned, do a volatile access
536 x = *(volatile jlong*)p;
537 } else {
538 jlong_accessor acc;
539 acc.words[0] = ((volatile jint*)p)[0];
540 acc.words[1] = ((volatile jint*)p)[1];
541 x = acc.long_value;
542 }
543 t->set_doing_unsafe_access(false);
544 return x;
545 UNSAFE_END
546
547 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
548 UnsafeWrapper("Unsafe_SetNativeLong");
549 JavaThread* t = JavaThread::current();
550 // see comment for Unsafe_GetNativeLong
551 t->set_doing_unsafe_access(true);
552 void* p = addr_from_java(addr);
553 if (((intptr_t)p & 7) == 0) {
554 // jlong is aligned, do a volatile access
555 *(volatile jlong*)p = x;
556 } else {
557 jlong_accessor acc;
558 acc.long_value = x;
559 ((volatile jint*)p)[0] = acc.words[0];
560 ((volatile jint*)p)[1] = acc.words[1];
561 }
562 t->set_doing_unsafe_access(false);
563 UNSAFE_END
564
565
566 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
567 UnsafeWrapper("Unsafe_GetNativeAddress");
568 void* p = addr_from_java(addr);
569 return addr_to_java(*(void**)p);
570 UNSAFE_END
571
572 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
573 UnsafeWrapper("Unsafe_SetNativeAddress");
574 void* p = addr_from_java(addr);
575 *(void**)p = addr_from_java(x);
576 UNSAFE_END
577
578
579 ////// Allocation requests
580
581 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
582 UnsafeWrapper("Unsafe_AllocateInstance");
583 {
584 ThreadToNativeFromVM ttnfv(thread);
585 return env->AllocObject(cls);
586 }
587 UNSAFE_END
588
589 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
590 UnsafeWrapper("Unsafe_AllocateMemory");
591 size_t sz = (size_t)size;
592 if (sz != (julong)size || size < 0) {
593 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
594 }
595 if (sz == 0) {
596 return 0;
597 }
598 sz = round_to(sz, HeapWordSize);
599 void* x = os::malloc(sz);
600 if (x == NULL) {
601 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
602 }
603 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
604 return addr_to_java(x);
605 UNSAFE_END
606
607 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
608 UnsafeWrapper("Unsafe_ReallocateMemory");
609 void* p = addr_from_java(addr);
610 size_t sz = (size_t)size;
611 if (sz != (julong)size || size < 0) {
612 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
613 }
614 if (sz == 0) {
615 os::free(p);
616 return 0;
617 }
618 sz = round_to(sz, HeapWordSize);
619 void* x = (p == NULL) ? os::malloc(sz) : os::realloc(p, sz);
620 if (x == NULL) {
621 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
622 }
623 return addr_to_java(x);
624 UNSAFE_END
625
626 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
627 UnsafeWrapper("Unsafe_FreeMemory");
628 void* p = addr_from_java(addr);
629 if (p == NULL) {
630 return;
631 }
632 os::free(p);
633 UNSAFE_END
634
635 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
636 UnsafeWrapper("Unsafe_SetMemory");
637 size_t sz = (size_t)size;
638 if (sz != (julong)size || size < 0) {
639 THROW(vmSymbols::java_lang_IllegalArgumentException());
640 }
641 char* p = (char*) addr_from_java(addr);
642 Copy::fill_to_memory_atomic(p, sz, value);
643 UNSAFE_END
644
645 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
646 UnsafeWrapper("Unsafe_SetMemory");
647 size_t sz = (size_t)size;
648 if (sz != (julong)size || size < 0) {
649 THROW(vmSymbols::java_lang_IllegalArgumentException());
650 }
651 oop base = JNIHandles::resolve(obj);
652 void* p = index_oop_from_field_offset_long(base, offset);
653 Copy::fill_to_memory_atomic(p, sz, value);
654 UNSAFE_END
655
656 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
657 UnsafeWrapper("Unsafe_CopyMemory");
658 if (size == 0) {
659 return;
660 }
661 size_t sz = (size_t)size;
662 if (sz != (julong)size || size < 0) {
663 THROW(vmSymbols::java_lang_IllegalArgumentException());
664 }
665 void* src = addr_from_java(srcAddr);
666 void* dst = addr_from_java(dstAddr);
667 Copy::conjoint_memory_atomic(src, dst, sz);
668 UNSAFE_END
669
670 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
671 UnsafeWrapper("Unsafe_CopyMemory");
672 if (size == 0) {
673 return;
674 }
675 size_t sz = (size_t)size;
676 if (sz != (julong)size || size < 0) {
677 THROW(vmSymbols::java_lang_IllegalArgumentException());
678 }
679 oop srcp = JNIHandles::resolve(srcObj);
680 oop dstp = JNIHandles::resolve(dstObj);
681 if (dstp != NULL && !dstp->is_typeArray()) {
682 // NYI: This works only for non-oop arrays at present.
683 // Generalizing it would be reasonable, but requires card marking.
684 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
685 THROW(vmSymbols::java_lang_IllegalArgumentException());
686 }
687 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
688 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
689 Copy::conjoint_memory_atomic(src, dst, sz);
690 UNSAFE_END
691
692
693 ////// Random queries
694
695 // See comment at file start about UNSAFE_LEAF
696 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
697 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
698 UnsafeWrapper("Unsafe_AddressSize");
699 return sizeof(void*);
700 UNSAFE_END
701
702 // See comment at file start about UNSAFE_LEAF
703 //UNSAFE_LEAF(jint, Unsafe_PageSize())
704 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
705 UnsafeWrapper("Unsafe_PageSize");
706 return os::vm_page_size();
707 UNSAFE_END
708
709 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
710 if (field == NULL) {
711 THROW_0(vmSymbols::java_lang_NullPointerException());
712 }
713
714 oop reflected = JNIHandles::resolve_non_null(field);
715 oop mirror = java_lang_reflect_Field::clazz(reflected);
716 klassOop k = java_lang_Class::as_klassOop(mirror);
717 int slot = java_lang_reflect_Field::slot(reflected);
718 int modifiers = java_lang_reflect_Field::modifiers(reflected);
719
720 if (must_be_static >= 0) {
721 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
722 if (must_be_static != really_is_static) {
723 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
724 }
725 }
726
727 int offset = instanceKlass::cast(k)->field_offset(slot);
728 return field_offset_from_byte_offset(offset);
729 }
730
731 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
732 UnsafeWrapper("Unsafe_ObjectFieldOffset");
733 return find_field_offset(field, 0, THREAD);
734 UNSAFE_END
735
736 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
737 UnsafeWrapper("Unsafe_StaticFieldOffset");
738 return find_field_offset(field, 1, THREAD);
739 UNSAFE_END
740
741 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
742 UnsafeWrapper("Unsafe_StaticFieldBase");
743 // Note: In this VM implementation, a field address is always a short
744 // offset from the base of a a klass metaobject. Thus, the full dynamic
745 // range of the return type is never used. However, some implementations
746 // might put the static field inside an array shared by many classes,
747 // or even at a fixed address, in which case the address could be quite
748 // large. In that last case, this function would return NULL, since
749 // the address would operate alone, without any base pointer.
750
751 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
752
753 oop reflected = JNIHandles::resolve_non_null(field);
754 oop mirror = java_lang_reflect_Field::clazz(reflected);
755 int modifiers = java_lang_reflect_Field::modifiers(reflected);
756
757 if ((modifiers & JVM_ACC_STATIC) == 0) {
758 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
759 }
760
761 return JNIHandles::make_local(env, mirror);
762 UNSAFE_END
763
764 //@deprecated
765 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
766 UnsafeWrapper("Unsafe_FieldOffset");
767 // tries (but fails) to be polymorphic between static and non-static:
768 jlong offset = find_field_offset(field, -1, THREAD);
769 guarantee(offset == (jint)offset, "offset fits in 32 bits");
770 return (jint)offset;
771 UNSAFE_END
772
773 //@deprecated
774 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
775 UnsafeWrapper("Unsafe_StaticFieldBase");
776 if (clazz == NULL) {
777 THROW_0(vmSymbols::java_lang_NullPointerException());
778 }
779 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
780 UNSAFE_END
781
782 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz))
783 UnsafeWrapper("Unsafe_EnsureClassInitialized");
784 if (clazz == NULL) {
785 THROW(vmSymbols::java_lang_NullPointerException());
786 }
787 oop mirror = JNIHandles::resolve_non_null(clazz);
788 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(mirror));
789 if (k != NULL) {
790 k->initialize(CHECK);
791 }
792 UNSAFE_END
793
794 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
795 if (acls == NULL) {
796 THROW(vmSymbols::java_lang_NullPointerException());
797 }
798 oop mirror = JNIHandles::resolve_non_null(acls);
799 klassOop k = java_lang_Class::as_klassOop(mirror);
800 if (k == NULL || !k->klass_part()->oop_is_array()) {
801 THROW(vmSymbols::java_lang_InvalidClassException());
802 } else if (k->klass_part()->oop_is_objArray()) {
803 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
804 scale = heapOopSize;
805 } else if (k->klass_part()->oop_is_typeArray()) {
806 typeArrayKlass* tak = typeArrayKlass::cast(k);
807 base = tak->array_header_in_bytes();
808 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
809 scale = (1 << tak->log2_element_size());
810 } else {
811 ShouldNotReachHere();
812 }
813 }
814
815 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
816 UnsafeWrapper("Unsafe_ArrayBaseOffset");
817 int base, scale;
818 getBaseAndScale(base, scale, acls, CHECK_0);
819 return field_offset_from_byte_offset(base);
820 UNSAFE_END
821
822
823 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
824 UnsafeWrapper("Unsafe_ArrayIndexScale");
825 int base, scale;
826 getBaseAndScale(base, scale, acls, CHECK_0);
827 // This VM packs both fields and array elements down to the byte.
828 // But watch out: If this changes, so that array references for
829 // a given primitive type (say, T_BOOLEAN) use different memory units
830 // than fields, this method MUST return zero for such arrays.
831 // For example, the VM used to store sub-word sized fields in full
832 // words in the object layout, so that accessors like getByte(Object,int)
833 // did not really do what one might expect for arrays. Therefore,
834 // this function used to report a zero scale factor, so that the user
835 // would know not to attempt to access sub-word array elements.
836 // // Code for unpacked fields:
837 // if (scale < wordSize) return 0;
838
839 // The following allows for a pretty general fieldOffset cookie scheme,
840 // but requires it to be linear in byte offset.
841 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
842 UNSAFE_END
843
844
845 static inline void throw_new(JNIEnv *env, const char *ename) {
846 char buf[100];
847 strcpy(buf, "java/lang/");
848 strcat(buf, ename);
849 jclass cls = env->FindClass(buf);
850 char* msg = NULL;
851 env->ThrowNew(cls, msg);
852 }
853
854 static jclass Unsafe_DefineClass(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
855 {
856 // Code lifted from JDK 1.3 ClassLoader.c
857
858 jbyte *body;
859 char *utfName;
860 jclass result = 0;
861 char buf[128];
862
863 if (UsePerfData) {
864 ClassLoader::unsafe_defineClassCallCounter()->inc();
865 }
866
867 if (data == NULL) {
868 throw_new(env, "NullPointerException");
869 return 0;
870 }
871
872 /* Work around 4153825. malloc crashes on Solaris when passed a
873 * negative size.
874 */
875 if (length < 0) {
876 throw_new(env, "ArrayIndexOutOfBoundsException");
877 return 0;
878 }
879
880 body = NEW_C_HEAP_ARRAY(jbyte, length);
881
882 if (body == 0) {
883 throw_new(env, "OutOfMemoryError");
884 return 0;
885 }
886
887 env->GetByteArrayRegion(data, offset, length, body);
888
889 if (env->ExceptionOccurred())
890 goto free_body;
891
892 if (name != NULL) {
893 uint len = env->GetStringUTFLength(name);
894 int unicode_len = env->GetStringLength(name);
895 if (len >= sizeof(buf)) {
896 utfName = NEW_C_HEAP_ARRAY(char, len + 1);
897 if (utfName == NULL) {
898 throw_new(env, "OutOfMemoryError");
899 goto free_body;
900 }
901 } else {
902 utfName = buf;
903 }
904 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
905 //VerifyFixClassname(utfName);
906 for (uint i = 0; i < len; i++) {
907 if (utfName[i] == '.') utfName[i] = '/';
908 }
909 } else {
910 utfName = NULL;
911 }
912
913 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
914
915 if (utfName && utfName != buf)
916 FREE_C_HEAP_ARRAY(char, utfName);
917
918 free_body:
919 FREE_C_HEAP_ARRAY(jbyte, body);
920 return result;
921 }
922 }
923
924
925 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
926 UnsafeWrapper("Unsafe_DefineClass");
927 {
928 ThreadToNativeFromVM ttnfv(thread);
929
930 int depthFromDefineClass0 = 1;
931 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
932 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
933 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
934
935 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
936 }
937 UNSAFE_END
938
939
940 UNSAFE_ENTRY(jclass, Unsafe_DefineClass1(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
941 UnsafeWrapper("Unsafe_DefineClass");
942 {
943 ThreadToNativeFromVM ttnfv(thread);
944
945 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
946 }
947 UNSAFE_END
948
949 #define DAC_Args CLS"[B["OBJ
950 // define a class but do not make it known to the class loader or system dictionary
951 // - host_class: supplies context for linkage, access control, protection domain, and class loader
952 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
953 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
954
955 // When you load an anonymous class U, it works as if you changed its name just before loading,
956 // to a name that you will never use again. Since the name is lost, no other class can directly
957 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
958 // through java.lang.Class methods like Class.newInstance.
959
960 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
961 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
962 // An anonymous class also has special privileges to access any member of its host class.
963 // This is the main reason why this loading operation is unsafe. The purpose of this is to
964 // allow language implementations to simulate "open classes"; a host class in effect gets
965 // new code when an anonymous class is loaded alongside it. A less convenient but more
966 // standard way to do this is with reflection, which can also be set to ignore access
967 // restrictions.
968
969 // Access into an anonymous class is possible only through reflection. Therefore, there
970 // are no special access rules for calling into an anonymous class. The relaxed access
971 // rule for the host class is applied in the opposite direction: A host class reflectively
972 // access one of its anonymous classes.
973
974 // If you load the same bytecodes twice, you get two different classes. You can reload
975 // the same bytecodes with or without varying CP patches.
976
977 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
978 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
979 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
980
981 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
982 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
983 // It is not possible for a named class, or an older anonymous class, to refer by
984 // name (via its CP) to a newer anonymous class.
985
986 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
987 // or type descriptors used in the loaded anonymous class.
988
989 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
990 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
991 // be changed to println(greeting), where greeting is an arbitrary object created before
992 // the anonymous class is loaded. This is useful in dynamic languages, in which
993 // various kinds of metaobjects must be introduced as constants into bytecode.
994 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
995 // not just a literal string. For such ldc instructions, the verifier uses the
996 // type Object instead of String, if the loaded constant is not in fact a String.
997
998 static oop
999 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
1000 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
1001 HeapWord* *temp_alloc,
1002 TRAPS) {
1003
1004 if (UsePerfData) {
1005 ClassLoader::unsafe_defineClassCallCounter()->inc();
1006 }
1007
1008 if (data == NULL) {
1009 THROW_0(vmSymbols::java_lang_NullPointerException());
1010 }
1011
1012 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
1013 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
1014 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length);
1015 if (body == NULL) {
1016 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1017 }
1018
1019 // caller responsible to free it:
1020 (*temp_alloc) = body;
1021
1022 {
1023 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1024 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1025 }
1026
1027 u1* class_bytes = (u1*) body;
1028 int class_bytes_length = (int) length;
1029 if (class_bytes_length < 0) class_bytes_length = 0;
1030 if (class_bytes == NULL
1031 || host_class == NULL
1032 || length != class_bytes_length)
1033 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1034
1035 objArrayHandle cp_patches_h;
1036 if (cp_patches_jh != NULL) {
1037 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1038 if (!p->is_objArray())
1039 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1040 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1041 }
1042
1043 KlassHandle host_klass(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(host_class)));
1044 const char* host_source = host_klass->external_name();
1045 Handle host_loader(THREAD, host_klass->class_loader());
1046 Handle host_domain(THREAD, host_klass->protection_domain());
1047
1048 GrowableArray<Handle>* cp_patches = NULL;
1049 if (cp_patches_h.not_null()) {
1050 int alen = cp_patches_h->length();
1051 for (int i = alen-1; i >= 0; i--) {
1052 oop p = cp_patches_h->obj_at(i);
1053 if (p != NULL) {
1054 Handle patch(THREAD, p);
1055 if (cp_patches == NULL)
1056 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1057 cp_patches->at_put(i, patch);
1058 }
1059 }
1060 }
1061
1062 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1063
1064 instanceKlassHandle anon_klass;
1065 {
1066 Symbol* no_class_name = NULL;
1067 klassOop anonk = SystemDictionary::parse_stream(no_class_name,
1068 host_loader, host_domain,
1069 &st, host_klass, cp_patches,
1070 CHECK_NULL);
1071 if (anonk == NULL) return NULL;
1072 anon_klass = instanceKlassHandle(THREAD, anonk);
1073 }
1074
1075 // let caller initialize it as needed...
1076
1077 return anon_klass->java_mirror();
1078 }
1079
1080 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1081 {
1082 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1083 ResourceMark rm(THREAD);
1084
1085 HeapWord* temp_alloc = NULL;
1086
1087 jobject res_jh = NULL;
1088
1089 { oop res_oop = Unsafe_DefineAnonymousClass_impl(env,
1090 host_class, data, cp_patches_jh,
1091 &temp_alloc, THREAD);
1092 if (res_oop != NULL)
1093 res_jh = JNIHandles::make_local(env, res_oop);
1094 }
1095
1096 // try/finally clause:
1097 if (temp_alloc != NULL) {
1098 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc);
1099 }
1100
1101 return (jclass) res_jh;
1102 }
1103 UNSAFE_END
1104
1105
1106
1107 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1108 UnsafeWrapper("Unsafe_MonitorEnter");
1109 {
1110 if (jobj == NULL) {
1111 THROW(vmSymbols::java_lang_NullPointerException());
1112 }
1113 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1114 ObjectSynchronizer::jni_enter(obj, CHECK);
1115 }
1116 UNSAFE_END
1117
1118
1119 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1120 UnsafeWrapper("Unsafe_TryMonitorEnter");
1121 {
1122 if (jobj == NULL) {
1123 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1124 }
1125 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1126 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1127 return (res ? JNI_TRUE : JNI_FALSE);
1128 }
1129 UNSAFE_END
1130
1131
1132 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1133 UnsafeWrapper("Unsafe_MonitorExit");
1134 {
1135 if (jobj == NULL) {
1136 THROW(vmSymbols::java_lang_NullPointerException());
1137 }
1138 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1139 ObjectSynchronizer::jni_exit(obj(), CHECK);
1140 }
1141 UNSAFE_END
1142
1143
1144 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1145 UnsafeWrapper("Unsafe_ThrowException");
1146 {
1147 ThreadToNativeFromVM ttnfv(thread);
1148 env->Throw(thr);
1149 }
1150 UNSAFE_END
1151
1152 // JSR166 ------------------------------------------------------------------
1153
1154 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1155 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1156 oop x = JNIHandles::resolve(x_h);
1157 oop e = JNIHandles::resolve(e_h);
1158 oop p = JNIHandles::resolve(obj);
1159 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1160 if (UseCompressedOops) {
1161 update_barrier_set_pre((narrowOop*)addr, e);
1162 } else {
1163 update_barrier_set_pre((oop*)addr, e);
1164 }
1165 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e);
1166 jboolean success = (res == e);
1167 if (success)
1168 update_barrier_set((void*)addr, x);
1169 return success;
1170 UNSAFE_END
1171
1172 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1173 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1174 oop p = JNIHandles::resolve(obj);
1175 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1176 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1177 UNSAFE_END
1178
1179 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1180 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1181 Handle p (THREAD, JNIHandles::resolve(obj));
1182 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1183 if (VM_Version::supports_cx8())
1184 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1185 else {
1186 jboolean success = false;
1187 ObjectLocker ol(p, THREAD);
1188 if (*addr == e) { *addr = x; success = true; }
1189 return success;
1190 }
1191 UNSAFE_END
1192
1193 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1194 UnsafeWrapper("Unsafe_Park");
1195 #ifndef USDT2
1196 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1197 #else /* USDT2 */
1198 HOTSPOT_THREAD_PARK_BEGIN(
1199 (uintptr_t) thread->parker(), (int) isAbsolute, time);
1200 #endif /* USDT2 */
1201 JavaThreadParkedState jtps(thread, time != 0);
1202 thread->parker()->park(isAbsolute != 0, time);
1203 #ifndef USDT2
1204 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1205 #else /* USDT2 */
1206 HOTSPOT_THREAD_PARK_END(
1207 (uintptr_t) thread->parker());
1208 #endif /* USDT2 */
1209 UNSAFE_END
1210
1211 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1212 UnsafeWrapper("Unsafe_Unpark");
1213 Parker* p = NULL;
1214 if (jthread != NULL) {
1215 oop java_thread = JNIHandles::resolve_non_null(jthread);
1216 if (java_thread != NULL) {
1217 jlong lp = java_lang_Thread::park_event(java_thread);
1218 if (lp != 0) {
1219 // This cast is OK even though the jlong might have been read
1220 // non-atomically on 32bit systems, since there, one word will
1221 // always be zero anyway and the value set is always the same
1222 p = (Parker*)addr_from_java(lp);
1223 } else {
1224 // Grab lock if apparently null or using older version of library
1225 MutexLocker mu(Threads_lock);
1226 java_thread = JNIHandles::resolve_non_null(jthread);
1227 if (java_thread != NULL) {
1228 JavaThread* thr = java_lang_Thread::thread(java_thread);
1229 if (thr != NULL) {
1230 p = thr->parker();
1231 if (p != NULL) { // Bind to Java thread for next time.
1232 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1233 }
1234 }
1235 }
1236 }
1237 }
1238 }
1239 if (p != NULL) {
1240 #ifndef USDT2
1241 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1242 #else /* USDT2 */
1243 HOTSPOT_THREAD_UNPARK(
1244 (uintptr_t) p);
1245 #endif /* USDT2 */
1246 p->unpark();
1247 }
1248 UNSAFE_END
1249
1250 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1251 UnsafeWrapper("Unsafe_Loadavg");
1252 const int max_nelem = 3;
1253 double la[max_nelem];
1254 jint ret;
1255
1256 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1257 assert(a->is_typeArray(), "must be type array");
1258
1259 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1260 ThreadToNativeFromVM ttnfv(thread);
1261 throw_new(env, "ArrayIndexOutOfBoundsException");
1262 return -1;
1263 }
1264
1265 ret = os::loadavg(la, nelem);
1266 if (ret == -1) return -1;
1267
1268 // if successful, ret is the number of samples actually retrieved.
1269 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1270 switch(ret) {
1271 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1272 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1273 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1274 }
1275 return ret;
1276 UNSAFE_END
1277
1278 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1279 UnsafeWrapper("Unsafe_PrefetchRead");
1280 oop p = JNIHandles::resolve(obj);
1281 void* addr = index_oop_from_field_offset_long(p, 0);
1282 Prefetch::read(addr, (intx)offset);
1283 UNSAFE_END
1284
1285 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1286 UnsafeWrapper("Unsafe_PrefetchWrite");
1287 oop p = JNIHandles::resolve(obj);
1288 void* addr = index_oop_from_field_offset_long(p, 0);
1289 Prefetch::write(addr, (intx)offset);
1290 UNSAFE_END
1291
1292
1293 /// JVM_RegisterUnsafeMethods
1294
1295 #define ADR "J"
1296
1297 #define LANG "Ljava/lang/"
1298
1299 #define OBJ LANG"Object;"
1300 #define CLS LANG"Class;"
1301 #define CTR LANG"reflect/Constructor;"
1302 #define FLD LANG"reflect/Field;"
1303 #define MTH LANG"reflect/Method;"
1304 #define THR LANG"Throwable;"
1305
1306 #define DC0_Args LANG"String;[BII"
1307 #define DC1_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1308
1309 #define CC (char*) /*cast a literal from (const char*)*/
1310 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1311
1312 // define deprecated accessors for compabitility with 1.4.0
1313 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1314 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1315 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1316
1317 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1318 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1319 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1320 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1321
1322 // Note: In 1.5.0, there are volatile versions too
1323 #define DECLARE_GETSETOOP(Boolean, Z) \
1324 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1325 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1326 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1327 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1328
1329
1330 #define DECLARE_GETSETNATIVE(Byte, B) \
1331 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1332 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1333
1334
1335
1336 // %%% These are temporarily supported until the SDK sources
1337 // contain the necessarily updated Unsafe.java.
1338 static JNINativeMethod methods_140[] = {
1339
1340 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)},
1341 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)},
1342
1343 DECLARE_GETSETOOP_140(Boolean, Z),
1344 DECLARE_GETSETOOP_140(Byte, B),
1345 DECLARE_GETSETOOP_140(Short, S),
1346 DECLARE_GETSETOOP_140(Char, C),
1347 DECLARE_GETSETOOP_140(Int, I),
1348 DECLARE_GETSETOOP_140(Long, J),
1349 DECLARE_GETSETOOP_140(Float, F),
1350 DECLARE_GETSETOOP_140(Double, D),
1351
1352 DECLARE_GETSETNATIVE(Byte, B),
1353 DECLARE_GETSETNATIVE(Short, S),
1354 DECLARE_GETSETNATIVE(Char, C),
1355 DECLARE_GETSETNATIVE(Int, I),
1356 DECLARE_GETSETNATIVE(Long, J),
1357 DECLARE_GETSETNATIVE(Float, F),
1358 DECLARE_GETSETNATIVE(Double, D),
1359
1360 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1361 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1362
1363 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1364 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1365 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1366 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1367 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1368
1369 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, //deprecated
1370 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, //deprecated
1371 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1372 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1373 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1374 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1375 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1376
1377 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1378 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1379 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1380 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1381 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1382 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1383 };
1384
1385 // These are the old methods prior to the JSR 166 changes in 1.5.0
1386 static JNINativeMethod methods_141[] = {
1387
1388 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1389 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1390
1391 DECLARE_GETSETOOP_141(Boolean, Z),
1392 DECLARE_GETSETOOP_141(Byte, B),
1393 DECLARE_GETSETOOP_141(Short, S),
1394 DECLARE_GETSETOOP_141(Char, C),
1395 DECLARE_GETSETOOP_141(Int, I),
1396 DECLARE_GETSETOOP_141(Long, J),
1397 DECLARE_GETSETOOP_141(Float, F),
1398 DECLARE_GETSETOOP_141(Double, D),
1399
1400 DECLARE_GETSETNATIVE(Byte, B),
1401 DECLARE_GETSETNATIVE(Short, S),
1402 DECLARE_GETSETNATIVE(Char, C),
1403 DECLARE_GETSETNATIVE(Int, I),
1404 DECLARE_GETSETNATIVE(Long, J),
1405 DECLARE_GETSETNATIVE(Float, F),
1406 DECLARE_GETSETNATIVE(Double, D),
1407
1408 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1409 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1410
1411 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1412 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1413 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1414 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1415 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1416
1417 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1418 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1419 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1420 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1421 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1422 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1423 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1424 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1425
1426 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1427 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1428 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1429 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1430 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1431 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1432
1433 };
1434
1435 // These are the old methods prior to the JSR 166 changes in 1.6.0
1436 static JNINativeMethod methods_15[] = {
1437
1438 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1439 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1440 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1441 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1442
1443
1444 DECLARE_GETSETOOP(Boolean, Z),
1445 DECLARE_GETSETOOP(Byte, B),
1446 DECLARE_GETSETOOP(Short, S),
1447 DECLARE_GETSETOOP(Char, C),
1448 DECLARE_GETSETOOP(Int, I),
1449 DECLARE_GETSETOOP(Long, J),
1450 DECLARE_GETSETOOP(Float, F),
1451 DECLARE_GETSETOOP(Double, D),
1452
1453 DECLARE_GETSETNATIVE(Byte, B),
1454 DECLARE_GETSETNATIVE(Short, S),
1455 DECLARE_GETSETNATIVE(Char, C),
1456 DECLARE_GETSETNATIVE(Int, I),
1457 DECLARE_GETSETNATIVE(Long, J),
1458 DECLARE_GETSETNATIVE(Float, F),
1459 DECLARE_GETSETNATIVE(Double, D),
1460
1461 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1462 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1463
1464 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1465 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1466 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1467 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1468 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1469
1470 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1471 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1472 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1473 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1474 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1475 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1476 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1477 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1478
1479 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1480 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1481 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1482 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1483 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1484 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1485 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1486 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1487 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1488 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1489 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1490
1491 };
1492
1493 // These are the correct methods, moving forward:
1494 static JNINativeMethod methods[] = {
1495
1496 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1497 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1498 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1499 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1500
1501
1502 DECLARE_GETSETOOP(Boolean, Z),
1503 DECLARE_GETSETOOP(Byte, B),
1504 DECLARE_GETSETOOP(Short, S),
1505 DECLARE_GETSETOOP(Char, C),
1506 DECLARE_GETSETOOP(Int, I),
1507 DECLARE_GETSETOOP(Long, J),
1508 DECLARE_GETSETOOP(Float, F),
1509 DECLARE_GETSETOOP(Double, D),
1510
1511 DECLARE_GETSETNATIVE(Byte, B),
1512 DECLARE_GETSETNATIVE(Short, S),
1513 DECLARE_GETSETNATIVE(Char, C),
1514 DECLARE_GETSETNATIVE(Int, I),
1515 DECLARE_GETSETNATIVE(Long, J),
1516 DECLARE_GETSETNATIVE(Float, F),
1517 DECLARE_GETSETNATIVE(Double, D),
1518
1519 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1520 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1521
1522 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1523 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1524 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1525 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1526 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1527
1528 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1529 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1530 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1531 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1532 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1533 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1534 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1535 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1536
1537 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1538 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1539 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1540 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1541 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1542 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1543 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1544 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1545 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1546 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1547 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1548 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1549 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1550 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1551 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1552
1553 // {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)},
1554
1555 // {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1556 // {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1557 // {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1558 // {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1559
1560 };
1561
1562 JNINativeMethod loadavg_method[] = {
1563 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1564 };
1565
1566 JNINativeMethod prefetch_methods[] = {
1567 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1568 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1569 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1570 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1571 };
1572
1573 JNINativeMethod memcopy_methods[] = {
1574 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1575 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1576 };
1577
1578 JNINativeMethod memcopy_methods_15[] = {
1579 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1580 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1581 };
1582
1583 JNINativeMethod anonk_methods[] = {
1584 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1585 };
1586
1587 #undef CC
1588 #undef FN_PTR
1589
1590 #undef ADR
1591 #undef LANG
1592 #undef OBJ
1593 #undef CLS
1594 #undef CTR
1595 #undef FLD
1596 #undef MTH
1597 #undef THR
1598 #undef DC0_Args
1599 #undef DC1_Args
1600
1601 #undef DECLARE_GETSETOOP
1602 #undef DECLARE_GETSETNATIVE
1603
1604
1605 // This one function is exported, used by NativeLookup.
1606 // The Unsafe_xxx functions above are called only from the interpreter.
1607 // The optimizer looks at names and signatures to recognize
1608 // individual functions.
1609
1610 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1611 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1612 {
1613 ThreadToNativeFromVM ttnfv(thread);
1614 {
1615 env->RegisterNatives(unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1616 if (env->ExceptionOccurred()) {
1617 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1618 tty->print_cr("Warning: SDK 1.6 Unsafe.loadavg not found.");
1619 }
1620 env->ExceptionClear();
1621 }
1622 }
1623 {
1624 env->RegisterNatives(unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1625 if (env->ExceptionOccurred()) {
1626 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1627 tty->print_cr("Warning: SDK 1.6 Unsafe.prefetchRead/Write not found.");
1628 }
1629 env->ExceptionClear();
1630 }
1631 }
1632 {
1633 env->RegisterNatives(unsafecls, memcopy_methods, sizeof(memcopy_methods)/sizeof(JNINativeMethod));
1634 if (env->ExceptionOccurred()) {
1635 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1636 tty->print_cr("Warning: SDK 1.7 Unsafe.copyMemory not found.");
1637 }
1638 env->ExceptionClear();
1639 env->RegisterNatives(unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1640 if (env->ExceptionOccurred()) {
1641 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1642 tty->print_cr("Warning: SDK 1.5 Unsafe.copyMemory not found.");
1643 }
1644 env->ExceptionClear();
1645 }
1646 }
1647 }
1648 if (EnableInvokeDynamic) {
1649 env->RegisterNatives(unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1650 if (env->ExceptionOccurred()) {
1651 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1652 tty->print_cr("Warning: SDK 1.7 Unsafe.defineClass (anonymous version) not found.");
1653 }
1654 env->ExceptionClear();
1655 }
1656 }
1657 int status = env->RegisterNatives(unsafecls, methods, sizeof(methods)/sizeof(JNINativeMethod));
1658 if (env->ExceptionOccurred()) {
1659 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1660 tty->print_cr("Warning: SDK 1.6 version of Unsafe not found.");
1661 }
1662 env->ExceptionClear();
1663 // %%% For now, be backward compatible with an older class:
1664 status = env->RegisterNatives(unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1665 }
1666 if (env->ExceptionOccurred()) {
1667 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1668 tty->print_cr("Warning: SDK 1.5 version of Unsafe not found.");
1669 }
1670 env->ExceptionClear();
1671 // %%% For now, be backward compatible with an older class:
1672 status = env->RegisterNatives(unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1673 }
1674 if (env->ExceptionOccurred()) {
1675 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1676 tty->print_cr("Warning: SDK 1.4.1 version of Unsafe not found.");
1677 }
1678 env->ExceptionClear();
1679 // %%% For now, be backward compatible with an older class:
1680 status = env->RegisterNatives(unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1681 }
1682 guarantee(status == 0, "register unsafe natives");
1683 }
1684 JVM_END