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src/share/vm/prims/unsafe.cpp@3514ee402842
src/share/vm/prims/unsafe.cpp
Thu, 16 Jan 2014 14:25:51 +0100
- author
- goetz
- date
- Thu, 16 Jan 2014 14:25:51 +0100
- changeset 6502
- 3514ee402842
- parent 5784
- 190899198332
- child 6518
- 62c54fcc0a35
- permissions
- -rw-r--r--
8029101: PPC64 (part 211): ordering of Independent Reads of Independent Writes
Reviewed-by: dholmes, kvn
Contributed-by: martin.doerr@sap.com
1 /*
2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/vmSymbols.hpp"
27 #include "utilities/macros.hpp"
28 #if INCLUDE_ALL_GCS
29 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
30 #endif // INCLUDE_ALL_GCS
31 #include "memory/allocation.inline.hpp"
32 #include "prims/jni.h"
33 #include "prims/jvm.h"
34 #include "runtime/globals.hpp"
35 #include "runtime/interfaceSupport.hpp"
36 #include "runtime/reflection.hpp"
37 #include "runtime/synchronizer.hpp"
38 #include "services/threadService.hpp"
39 #include "trace/tracing.hpp"
40 #include "utilities/copy.hpp"
41 #include "utilities/dtrace.hpp"
43 /*
44 * Implementation of class sun.misc.Unsafe
45 */
47 #ifndef USDT2
48 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long);
49 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t);
50 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t);
51 #endif /* !USDT2 */
53 #define MAX_OBJECT_SIZE \
54 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
55 + ((julong)max_jint * sizeof(double)) )
58 #define UNSAFE_ENTRY(result_type, header) \
59 JVM_ENTRY(result_type, header)
61 // Can't use UNSAFE_LEAF because it has the signature of a straight
62 // call into the runtime (just like JVM_LEAF, funny that) but it's
63 // called like a Java Native and thus the wrapper built for it passes
64 // arguments like a JNI call. It expects those arguments to be popped
65 // from the stack on Intel like all good JNI args are, and adjusts the
66 // stack according. Since the JVM_LEAF call expects no extra
67 // arguments the stack isn't popped in the C code, is pushed by the
68 // wrapper and we get sick.
69 //#define UNSAFE_LEAF(result_type, header) \
70 // JVM_LEAF(result_type, header)
72 #define UNSAFE_END JVM_END
74 #define UnsafeWrapper(arg) /*nothing, for the present*/
77 inline void* addr_from_java(jlong addr) {
78 // This assert fails in a variety of ways on 32-bit systems.
79 // It is impossible to predict whether native code that converts
80 // pointers to longs will sign-extend or zero-extend the addresses.
81 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
82 return (void*)(uintptr_t)addr;
83 }
85 inline jlong addr_to_java(void* p) {
86 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
87 return (uintptr_t)p;
88 }
91 // Note: The VM's obj_field and related accessors use byte-scaled
92 // ("unscaled") offsets, just as the unsafe methods do.
94 // However, the method Unsafe.fieldOffset explicitly declines to
95 // guarantee this. The field offset values manipulated by the Java user
96 // through the Unsafe API are opaque cookies that just happen to be byte
97 // offsets. We represent this state of affairs by passing the cookies
98 // through conversion functions when going between the VM and the Unsafe API.
99 // The conversion functions just happen to be no-ops at present.
101 inline jlong field_offset_to_byte_offset(jlong field_offset) {
102 return field_offset;
103 }
105 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
106 return byte_offset;
107 }
109 inline jint invocation_key_from_method_slot(jint slot) {
110 return slot;
111 }
113 inline jint invocation_key_to_method_slot(jint key) {
114 return key;
115 }
117 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
118 jlong byte_offset = field_offset_to_byte_offset(field_offset);
119 #ifdef ASSERT
120 if (p != NULL) {
121 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
122 if (byte_offset == (jint)byte_offset) {
123 void* ptr_plus_disp = (address)p + byte_offset;
124 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
125 "raw [ptr+disp] must be consistent with oop::field_base");
126 }
127 jlong p_size = HeapWordSize * (jlong)(p->size());
128 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size));
129 }
130 #endif
131 if (sizeof(char*) == sizeof(jint)) // (this constant folds!)
132 return (address)p + (jint) byte_offset;
133 else
134 return (address)p + byte_offset;
135 }
137 // Externally callable versions:
138 // (Use these in compiler intrinsics which emulate unsafe primitives.)
139 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
140 return field_offset;
141 }
142 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
143 return byte_offset;
144 }
145 jint Unsafe_invocation_key_from_method_slot(jint slot) {
146 return invocation_key_from_method_slot(slot);
147 }
148 jint Unsafe_invocation_key_to_method_slot(jint key) {
149 return invocation_key_to_method_slot(key);
150 }
153 ///// Data in the Java heap.
155 #define GET_FIELD(obj, offset, type_name, v) \
156 oop p = JNIHandles::resolve(obj); \
157 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
159 #define SET_FIELD(obj, offset, type_name, x) \
160 oop p = JNIHandles::resolve(obj); \
161 *(type_name*)index_oop_from_field_offset_long(p, offset) = x
163 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
164 oop p = JNIHandles::resolve(obj); \
165 if (support_IRIW_for_not_multiple_copy_atomic_cpu) { \
166 OrderAccess::fence(); \
167 } \
168 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
170 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
171 oop p = JNIHandles::resolve(obj); \
172 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x);
174 // Macros for oops that check UseCompressedOops
176 #define GET_OOP_FIELD(obj, offset, v) \
177 oop p = JNIHandles::resolve(obj); \
178 oop v; \
179 if (UseCompressedOops) { \
180 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
181 v = oopDesc::decode_heap_oop(n); \
182 } else { \
183 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
184 }
187 // Get/SetObject must be special-cased, since it works with handles.
189 // The xxx140 variants for backward compatibility do not allow a full-width offset.
190 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
191 UnsafeWrapper("Unsafe_GetObject");
192 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
193 GET_OOP_FIELD(obj, offset, v)
194 jobject ret = JNIHandles::make_local(env, v);
195 #if INCLUDE_ALL_GCS
196 // We could be accessing the referent field in a reference
197 // object. If G1 is enabled then we need to register a non-null
198 // referent with the SATB barrier.
199 if (UseG1GC) {
200 bool needs_barrier = false;
202 if (ret != NULL) {
203 if (offset == java_lang_ref_Reference::referent_offset) {
204 oop o = JNIHandles::resolve_non_null(obj);
205 Klass* k = o->klass();
206 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
207 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
208 needs_barrier = true;
209 }
210 }
211 }
213 if (needs_barrier) {
214 oop referent = JNIHandles::resolve(ret);
215 G1SATBCardTableModRefBS::enqueue(referent);
216 }
217 }
218 #endif // INCLUDE_ALL_GCS
219 return ret;
220 UNSAFE_END
222 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
223 UnsafeWrapper("Unsafe_SetObject");
224 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
225 oop x = JNIHandles::resolve(x_h);
226 //SET_FIELD(obj, offset, oop, x);
227 oop p = JNIHandles::resolve(obj);
228 if (UseCompressedOops) {
229 if (x != NULL) {
230 // If there is a heap base pointer, we are obliged to emit a store barrier.
231 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
232 } else {
233 narrowOop n = oopDesc::encode_heap_oop_not_null(x);
234 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
235 }
236 } else {
237 if (x != NULL) {
238 // If there is a heap base pointer, we are obliged to emit a store barrier.
239 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
240 } else {
241 *(oop*)index_oop_from_field_offset_long(p, offset) = x;
242 }
243 }
244 UNSAFE_END
246 // The normal variants allow a null base pointer with an arbitrary address.
247 // But if the base pointer is non-null, the offset should make some sense.
248 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
249 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
250 UnsafeWrapper("Unsafe_GetObject");
251 GET_OOP_FIELD(obj, offset, v)
252 jobject ret = JNIHandles::make_local(env, v);
253 #if INCLUDE_ALL_GCS
254 // We could be accessing the referent field in a reference
255 // object. If G1 is enabled then we need to register non-null
256 // referent with the SATB barrier.
257 if (UseG1GC) {
258 bool needs_barrier = false;
260 if (ret != NULL) {
261 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) {
262 oop o = JNIHandles::resolve(obj);
263 Klass* k = o->klass();
264 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
265 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
266 needs_barrier = true;
267 }
268 }
269 }
271 if (needs_barrier) {
272 oop referent = JNIHandles::resolve(ret);
273 G1SATBCardTableModRefBS::enqueue(referent);
274 }
275 }
276 #endif // INCLUDE_ALL_GCS
277 return ret;
278 UNSAFE_END
280 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
281 UnsafeWrapper("Unsafe_SetObject");
282 oop x = JNIHandles::resolve(x_h);
283 oop p = JNIHandles::resolve(obj);
284 if (UseCompressedOops) {
285 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
286 } else {
287 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
288 }
289 UNSAFE_END
291 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
292 UnsafeWrapper("Unsafe_GetObjectVolatile");
293 oop p = JNIHandles::resolve(obj);
294 void* addr = index_oop_from_field_offset_long(p, offset);
295 volatile oop v;
296 if (UseCompressedOops) {
297 volatile narrowOop n = *(volatile narrowOop*) addr;
298 (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n));
299 } else {
300 (void)const_cast<oop&>(v = *(volatile oop*) addr);
301 }
302 OrderAccess::acquire();
303 return JNIHandles::make_local(env, v);
304 UNSAFE_END
306 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
307 UnsafeWrapper("Unsafe_SetObjectVolatile");
308 oop x = JNIHandles::resolve(x_h);
309 oop p = JNIHandles::resolve(obj);
310 void* addr = index_oop_from_field_offset_long(p, offset);
311 OrderAccess::release();
312 if (UseCompressedOops) {
313 oop_store((narrowOop*)addr, x);
314 } else {
315 oop_store((oop*)addr, x);
316 }
317 OrderAccess::fence();
318 UNSAFE_END
320 #ifndef SUPPORTS_NATIVE_CX8
321 // Keep old code for platforms which may not have atomic jlong (8 bytes) instructions
323 // Volatile long versions must use locks if !VM_Version::supports_cx8().
324 // support_cx8 is a surrogate for 'supports atomic long memory ops'.
326 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
327 UnsafeWrapper("Unsafe_GetLongVolatile");
328 {
329 if (VM_Version::supports_cx8()) {
330 GET_FIELD_VOLATILE(obj, offset, jlong, v);
331 return v;
332 }
333 else {
334 Handle p (THREAD, JNIHandles::resolve(obj));
335 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
336 ObjectLocker ol(p, THREAD);
337 jlong value = *addr;
338 return value;
339 }
340 }
341 UNSAFE_END
343 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
344 UnsafeWrapper("Unsafe_SetLongVolatile");
345 {
346 if (VM_Version::supports_cx8()) {
347 SET_FIELD_VOLATILE(obj, offset, jlong, x);
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 *addr = x;
354 }
355 }
356 UNSAFE_END
358 #endif // not SUPPORTS_NATIVE_CX8
360 #define DEFINE_GETSETOOP(jboolean, Boolean) \
361 \
362 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
363 UnsafeWrapper("Unsafe_Get"#Boolean); \
364 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
365 GET_FIELD(obj, offset, jboolean, v); \
366 return v; \
367 UNSAFE_END \
368 \
369 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
370 UnsafeWrapper("Unsafe_Set"#Boolean); \
371 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
372 SET_FIELD(obj, offset, jboolean, x); \
373 UNSAFE_END \
374 \
375 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
376 UnsafeWrapper("Unsafe_Get"#Boolean); \
377 GET_FIELD(obj, offset, jboolean, v); \
378 return v; \
379 UNSAFE_END \
380 \
381 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
382 UnsafeWrapper("Unsafe_Set"#Boolean); \
383 SET_FIELD(obj, offset, jboolean, x); \
384 UNSAFE_END \
385 \
386 // END DEFINE_GETSETOOP.
388 DEFINE_GETSETOOP(jboolean, Boolean)
389 DEFINE_GETSETOOP(jbyte, Byte)
390 DEFINE_GETSETOOP(jshort, Short);
391 DEFINE_GETSETOOP(jchar, Char);
392 DEFINE_GETSETOOP(jint, Int);
393 DEFINE_GETSETOOP(jlong, Long);
394 DEFINE_GETSETOOP(jfloat, Float);
395 DEFINE_GETSETOOP(jdouble, Double);
397 #undef DEFINE_GETSETOOP
399 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
400 \
401 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
402 UnsafeWrapper("Unsafe_Get"#Boolean); \
403 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
404 return v; \
405 UNSAFE_END \
406 \
407 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
408 UnsafeWrapper("Unsafe_Set"#Boolean); \
409 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
410 UNSAFE_END \
411 \
412 // END DEFINE_GETSETOOP_VOLATILE.
414 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
415 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
416 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
417 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
418 DEFINE_GETSETOOP_VOLATILE(jint, Int);
419 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
420 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
422 #ifdef SUPPORTS_NATIVE_CX8
423 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
424 #endif
426 #undef DEFINE_GETSETOOP_VOLATILE
428 // The non-intrinsified versions of setOrdered just use setVolatile
430 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
431 UnsafeWrapper("Unsafe_SetOrderedInt");
432 SET_FIELD_VOLATILE(obj, offset, jint, x);
433 UNSAFE_END
435 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
436 UnsafeWrapper("Unsafe_SetOrderedObject");
437 oop x = JNIHandles::resolve(x_h);
438 oop p = JNIHandles::resolve(obj);
439 void* addr = index_oop_from_field_offset_long(p, offset);
440 OrderAccess::release();
441 if (UseCompressedOops) {
442 oop_store((narrowOop*)addr, x);
443 } else {
444 oop_store((oop*)addr, x);
445 }
446 OrderAccess::fence();
447 UNSAFE_END
449 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
450 UnsafeWrapper("Unsafe_SetOrderedLong");
451 #ifdef SUPPORTS_NATIVE_CX8
452 SET_FIELD_VOLATILE(obj, offset, jlong, x);
453 #else
454 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
455 {
456 if (VM_Version::supports_cx8()) {
457 SET_FIELD_VOLATILE(obj, offset, jlong, x);
458 }
459 else {
460 Handle p (THREAD, JNIHandles::resolve(obj));
461 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
462 ObjectLocker ol(p, THREAD);
463 *addr = x;
464 }
465 }
466 #endif
467 UNSAFE_END
469 UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe))
470 UnsafeWrapper("Unsafe_LoadFence");
471 OrderAccess::acquire();
472 UNSAFE_END
474 UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe))
475 UnsafeWrapper("Unsafe_StoreFence");
476 OrderAccess::release();
477 UNSAFE_END
479 UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe))
480 UnsafeWrapper("Unsafe_FullFence");
481 OrderAccess::fence();
482 UNSAFE_END
484 ////// Data in the C heap.
486 // Note: These do not throw NullPointerException for bad pointers.
487 // They just crash. Only a oop base pointer can generate a NullPointerException.
488 //
489 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
490 \
491 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
492 UnsafeWrapper("Unsafe_GetNative"#Type); \
493 void* p = addr_from_java(addr); \
494 JavaThread* t = JavaThread::current(); \
495 t->set_doing_unsafe_access(true); \
496 java_type x = *(volatile native_type*)p; \
497 t->set_doing_unsafe_access(false); \
498 return x; \
499 UNSAFE_END \
500 \
501 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
502 UnsafeWrapper("Unsafe_SetNative"#Type); \
503 JavaThread* t = JavaThread::current(); \
504 t->set_doing_unsafe_access(true); \
505 void* p = addr_from_java(addr); \
506 *(volatile native_type*)p = x; \
507 t->set_doing_unsafe_access(false); \
508 UNSAFE_END \
509 \
510 // END DEFINE_GETSETNATIVE.
512 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
513 DEFINE_GETSETNATIVE(jshort, Short, signed short);
514 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
515 DEFINE_GETSETNATIVE(jint, Int, jint);
516 // no long -- handled specially
517 DEFINE_GETSETNATIVE(jfloat, Float, float);
518 DEFINE_GETSETNATIVE(jdouble, Double, double);
520 #undef DEFINE_GETSETNATIVE
522 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
523 UnsafeWrapper("Unsafe_GetNativeLong");
524 JavaThread* t = JavaThread::current();
525 // We do it this way to avoid problems with access to heap using 64
526 // bit loads, as jlong in heap could be not 64-bit aligned, and on
527 // some CPUs (SPARC) it leads to SIGBUS.
528 t->set_doing_unsafe_access(true);
529 void* p = addr_from_java(addr);
530 jlong x;
531 if (((intptr_t)p & 7) == 0) {
532 // jlong is aligned, do a volatile access
533 x = *(volatile jlong*)p;
534 } else {
535 jlong_accessor acc;
536 acc.words[0] = ((volatile jint*)p)[0];
537 acc.words[1] = ((volatile jint*)p)[1];
538 x = acc.long_value;
539 }
540 t->set_doing_unsafe_access(false);
541 return x;
542 UNSAFE_END
544 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
545 UnsafeWrapper("Unsafe_SetNativeLong");
546 JavaThread* t = JavaThread::current();
547 // see comment for Unsafe_GetNativeLong
548 t->set_doing_unsafe_access(true);
549 void* p = addr_from_java(addr);
550 if (((intptr_t)p & 7) == 0) {
551 // jlong is aligned, do a volatile access
552 *(volatile jlong*)p = x;
553 } else {
554 jlong_accessor acc;
555 acc.long_value = x;
556 ((volatile jint*)p)[0] = acc.words[0];
557 ((volatile jint*)p)[1] = acc.words[1];
558 }
559 t->set_doing_unsafe_access(false);
560 UNSAFE_END
563 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
564 UnsafeWrapper("Unsafe_GetNativeAddress");
565 void* p = addr_from_java(addr);
566 return addr_to_java(*(void**)p);
567 UNSAFE_END
569 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
570 UnsafeWrapper("Unsafe_SetNativeAddress");
571 void* p = addr_from_java(addr);
572 *(void**)p = addr_from_java(x);
573 UNSAFE_END
576 ////// Allocation requests
578 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
579 UnsafeWrapper("Unsafe_AllocateInstance");
580 {
581 ThreadToNativeFromVM ttnfv(thread);
582 return env->AllocObject(cls);
583 }
584 UNSAFE_END
586 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
587 UnsafeWrapper("Unsafe_AllocateMemory");
588 size_t sz = (size_t)size;
589 if (sz != (julong)size || size < 0) {
590 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
591 }
592 if (sz == 0) {
593 return 0;
594 }
595 sz = round_to(sz, HeapWordSize);
596 void* x = os::malloc(sz, mtInternal);
597 if (x == NULL) {
598 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
599 }
600 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
601 return addr_to_java(x);
602 UNSAFE_END
604 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
605 UnsafeWrapper("Unsafe_ReallocateMemory");
606 void* p = addr_from_java(addr);
607 size_t sz = (size_t)size;
608 if (sz != (julong)size || size < 0) {
609 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
610 }
611 if (sz == 0) {
612 os::free(p);
613 return 0;
614 }
615 sz = round_to(sz, HeapWordSize);
616 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal);
617 if (x == NULL) {
618 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
619 }
620 return addr_to_java(x);
621 UNSAFE_END
623 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
624 UnsafeWrapper("Unsafe_FreeMemory");
625 void* p = addr_from_java(addr);
626 if (p == NULL) {
627 return;
628 }
629 os::free(p);
630 UNSAFE_END
632 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
633 UnsafeWrapper("Unsafe_SetMemory");
634 size_t sz = (size_t)size;
635 if (sz != (julong)size || size < 0) {
636 THROW(vmSymbols::java_lang_IllegalArgumentException());
637 }
638 char* p = (char*) addr_from_java(addr);
639 Copy::fill_to_memory_atomic(p, sz, value);
640 UNSAFE_END
642 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
643 UnsafeWrapper("Unsafe_SetMemory");
644 size_t sz = (size_t)size;
645 if (sz != (julong)size || size < 0) {
646 THROW(vmSymbols::java_lang_IllegalArgumentException());
647 }
648 oop base = JNIHandles::resolve(obj);
649 void* p = index_oop_from_field_offset_long(base, offset);
650 Copy::fill_to_memory_atomic(p, sz, value);
651 UNSAFE_END
653 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
654 UnsafeWrapper("Unsafe_CopyMemory");
655 if (size == 0) {
656 return;
657 }
658 size_t sz = (size_t)size;
659 if (sz != (julong)size || size < 0) {
660 THROW(vmSymbols::java_lang_IllegalArgumentException());
661 }
662 void* src = addr_from_java(srcAddr);
663 void* dst = addr_from_java(dstAddr);
664 Copy::conjoint_memory_atomic(src, dst, sz);
665 UNSAFE_END
667 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
668 UnsafeWrapper("Unsafe_CopyMemory");
669 if (size == 0) {
670 return;
671 }
672 size_t sz = (size_t)size;
673 if (sz != (julong)size || size < 0) {
674 THROW(vmSymbols::java_lang_IllegalArgumentException());
675 }
676 oop srcp = JNIHandles::resolve(srcObj);
677 oop dstp = JNIHandles::resolve(dstObj);
678 if (dstp != NULL && !dstp->is_typeArray()) {
679 // NYI: This works only for non-oop arrays at present.
680 // Generalizing it would be reasonable, but requires card marking.
681 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
682 THROW(vmSymbols::java_lang_IllegalArgumentException());
683 }
684 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
685 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
686 Copy::conjoint_memory_atomic(src, dst, sz);
687 UNSAFE_END
690 ////// Random queries
692 // See comment at file start about UNSAFE_LEAF
693 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
694 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
695 UnsafeWrapper("Unsafe_AddressSize");
696 return sizeof(void*);
697 UNSAFE_END
699 // See comment at file start about UNSAFE_LEAF
700 //UNSAFE_LEAF(jint, Unsafe_PageSize())
701 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
702 UnsafeWrapper("Unsafe_PageSize");
703 return os::vm_page_size();
704 UNSAFE_END
706 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
707 if (field == NULL) {
708 THROW_0(vmSymbols::java_lang_NullPointerException());
709 }
711 oop reflected = JNIHandles::resolve_non_null(field);
712 oop mirror = java_lang_reflect_Field::clazz(reflected);
713 Klass* k = java_lang_Class::as_Klass(mirror);
714 int slot = java_lang_reflect_Field::slot(reflected);
715 int modifiers = java_lang_reflect_Field::modifiers(reflected);
717 if (must_be_static >= 0) {
718 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
719 if (must_be_static != really_is_static) {
720 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
721 }
722 }
724 int offset = InstanceKlass::cast(k)->field_offset(slot);
725 return field_offset_from_byte_offset(offset);
726 }
728 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
729 UnsafeWrapper("Unsafe_ObjectFieldOffset");
730 return find_field_offset(field, 0, THREAD);
731 UNSAFE_END
733 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
734 UnsafeWrapper("Unsafe_StaticFieldOffset");
735 return find_field_offset(field, 1, THREAD);
736 UNSAFE_END
738 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
739 UnsafeWrapper("Unsafe_StaticFieldBase");
740 // Note: In this VM implementation, a field address is always a short
741 // offset from the base of a a klass metaobject. Thus, the full dynamic
742 // range of the return type is never used. However, some implementations
743 // might put the static field inside an array shared by many classes,
744 // or even at a fixed address, in which case the address could be quite
745 // large. In that last case, this function would return NULL, since
746 // the address would operate alone, without any base pointer.
748 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
750 oop reflected = JNIHandles::resolve_non_null(field);
751 oop mirror = java_lang_reflect_Field::clazz(reflected);
752 int modifiers = java_lang_reflect_Field::modifiers(reflected);
754 if ((modifiers & JVM_ACC_STATIC) == 0) {
755 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
756 }
758 return JNIHandles::make_local(env, mirror);
759 UNSAFE_END
761 //@deprecated
762 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
763 UnsafeWrapper("Unsafe_FieldOffset");
764 // tries (but fails) to be polymorphic between static and non-static:
765 jlong offset = find_field_offset(field, -1, THREAD);
766 guarantee(offset == (jint)offset, "offset fits in 32 bits");
767 return (jint)offset;
768 UNSAFE_END
770 //@deprecated
771 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
772 UnsafeWrapper("Unsafe_StaticFieldBase");
773 if (clazz == NULL) {
774 THROW_0(vmSymbols::java_lang_NullPointerException());
775 }
776 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
777 UNSAFE_END
779 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
780 UnsafeWrapper("Unsafe_EnsureClassInitialized");
781 if (clazz == NULL) {
782 THROW(vmSymbols::java_lang_NullPointerException());
783 }
784 oop mirror = JNIHandles::resolve_non_null(clazz);
786 Klass* klass = java_lang_Class::as_Klass(mirror);
787 if (klass != NULL && klass->should_be_initialized()) {
788 InstanceKlass* k = InstanceKlass::cast(klass);
789 k->initialize(CHECK);
790 }
791 }
792 UNSAFE_END
794 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
795 UnsafeWrapper("Unsafe_ShouldBeInitialized");
796 if (clazz == NULL) {
797 THROW_(vmSymbols::java_lang_NullPointerException(), false);
798 }
799 oop mirror = JNIHandles::resolve_non_null(clazz);
800 Klass* klass = java_lang_Class::as_Klass(mirror);
801 if (klass != NULL && klass->should_be_initialized()) {
802 return true;
803 }
804 return false;
805 }
806 UNSAFE_END
808 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
809 if (acls == NULL) {
810 THROW(vmSymbols::java_lang_NullPointerException());
811 }
812 oop mirror = JNIHandles::resolve_non_null(acls);
813 Klass* k = java_lang_Class::as_Klass(mirror);
814 if (k == NULL || !k->oop_is_array()) {
815 THROW(vmSymbols::java_lang_InvalidClassException());
816 } else if (k->oop_is_objArray()) {
817 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
818 scale = heapOopSize;
819 } else if (k->oop_is_typeArray()) {
820 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
821 base = tak->array_header_in_bytes();
822 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
823 scale = (1 << tak->log2_element_size());
824 } else {
825 ShouldNotReachHere();
826 }
827 }
829 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
830 UnsafeWrapper("Unsafe_ArrayBaseOffset");
831 int base, scale;
832 getBaseAndScale(base, scale, acls, CHECK_0);
833 return field_offset_from_byte_offset(base);
834 UNSAFE_END
837 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
838 UnsafeWrapper("Unsafe_ArrayIndexScale");
839 int base, scale;
840 getBaseAndScale(base, scale, acls, CHECK_0);
841 // This VM packs both fields and array elements down to the byte.
842 // But watch out: If this changes, so that array references for
843 // a given primitive type (say, T_BOOLEAN) use different memory units
844 // than fields, this method MUST return zero for such arrays.
845 // For example, the VM used to store sub-word sized fields in full
846 // words in the object layout, so that accessors like getByte(Object,int)
847 // did not really do what one might expect for arrays. Therefore,
848 // this function used to report a zero scale factor, so that the user
849 // would know not to attempt to access sub-word array elements.
850 // // Code for unpacked fields:
851 // if (scale < wordSize) return 0;
853 // The following allows for a pretty general fieldOffset cookie scheme,
854 // but requires it to be linear in byte offset.
855 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
856 UNSAFE_END
859 static inline void throw_new(JNIEnv *env, const char *ename) {
860 char buf[100];
861 strcpy(buf, "java/lang/");
862 strcat(buf, ename);
863 jclass cls = env->FindClass(buf);
864 char* msg = NULL;
865 env->ThrowNew(cls, msg);
866 }
868 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
869 {
870 // Code lifted from JDK 1.3 ClassLoader.c
872 jbyte *body;
873 char *utfName;
874 jclass result = 0;
875 char buf[128];
877 if (UsePerfData) {
878 ClassLoader::unsafe_defineClassCallCounter()->inc();
879 }
881 if (data == NULL) {
882 throw_new(env, "NullPointerException");
883 return 0;
884 }
886 /* Work around 4153825. malloc crashes on Solaris when passed a
887 * negative size.
888 */
889 if (length < 0) {
890 throw_new(env, "ArrayIndexOutOfBoundsException");
891 return 0;
892 }
894 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
896 if (body == 0) {
897 throw_new(env, "OutOfMemoryError");
898 return 0;
899 }
901 env->GetByteArrayRegion(data, offset, length, body);
903 if (env->ExceptionOccurred())
904 goto free_body;
906 if (name != NULL) {
907 uint len = env->GetStringUTFLength(name);
908 int unicode_len = env->GetStringLength(name);
909 if (len >= sizeof(buf)) {
910 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
911 if (utfName == NULL) {
912 throw_new(env, "OutOfMemoryError");
913 goto free_body;
914 }
915 } else {
916 utfName = buf;
917 }
918 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
919 //VerifyFixClassname(utfName);
920 for (uint i = 0; i < len; i++) {
921 if (utfName[i] == '.') utfName[i] = '/';
922 }
923 } else {
924 utfName = NULL;
925 }
927 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
929 if (utfName && utfName != buf)
930 FREE_C_HEAP_ARRAY(char, utfName, mtInternal);
932 free_body:
933 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal);
934 return result;
935 }
936 }
939 UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
940 UnsafeWrapper("Unsafe_DefineClass");
941 {
942 ThreadToNativeFromVM ttnfv(thread);
943 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
944 }
945 UNSAFE_END
948 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
949 UnsafeWrapper("Unsafe_DefineClass");
950 {
951 ThreadToNativeFromVM ttnfv(thread);
953 int depthFromDefineClass0 = 1;
954 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
955 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
956 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
958 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
959 }
960 UNSAFE_END
963 #define DAC_Args CLS"[B["OBJ
964 // define a class but do not make it known to the class loader or system dictionary
965 // - host_class: supplies context for linkage, access control, protection domain, and class loader
966 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
967 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
969 // When you load an anonymous class U, it works as if you changed its name just before loading,
970 // to a name that you will never use again. Since the name is lost, no other class can directly
971 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
972 // through java.lang.Class methods like Class.newInstance.
974 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
975 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
976 // An anonymous class also has special privileges to access any member of its host class.
977 // This is the main reason why this loading operation is unsafe. The purpose of this is to
978 // allow language implementations to simulate "open classes"; a host class in effect gets
979 // new code when an anonymous class is loaded alongside it. A less convenient but more
980 // standard way to do this is with reflection, which can also be set to ignore access
981 // restrictions.
983 // Access into an anonymous class is possible only through reflection. Therefore, there
984 // are no special access rules for calling into an anonymous class. The relaxed access
985 // rule for the host class is applied in the opposite direction: A host class reflectively
986 // access one of its anonymous classes.
988 // If you load the same bytecodes twice, you get two different classes. You can reload
989 // the same bytecodes with or without varying CP patches.
991 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
992 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
993 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
995 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
996 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
997 // It is not possible for a named class, or an older anonymous class, to refer by
998 // name (via its CP) to a newer anonymous class.
1000 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
1001 // or type descriptors used in the loaded anonymous class.
1003 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
1004 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
1005 // be changed to println(greeting), where greeting is an arbitrary object created before
1006 // the anonymous class is loaded. This is useful in dynamic languages, in which
1007 // various kinds of metaobjects must be introduced as constants into bytecode.
1008 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
1009 // not just a literal string. For such ldc instructions, the verifier uses the
1010 // type Object instead of String, if the loaded constant is not in fact a String.
1012 static instanceKlassHandle
1013 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
1014 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
1015 HeapWord* *temp_alloc,
1016 TRAPS) {
1018 if (UsePerfData) {
1019 ClassLoader::unsafe_defineClassCallCounter()->inc();
1020 }
1022 if (data == NULL) {
1023 THROW_0(vmSymbols::java_lang_NullPointerException());
1024 }
1026 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
1027 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
1028 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal);
1029 if (body == NULL) {
1030 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1031 }
1033 // caller responsible to free it:
1034 (*temp_alloc) = body;
1036 {
1037 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1038 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1039 }
1041 u1* class_bytes = (u1*) body;
1042 int class_bytes_length = (int) length;
1043 if (class_bytes_length < 0) class_bytes_length = 0;
1044 if (class_bytes == NULL
1045 || host_class == NULL
1046 || length != class_bytes_length)
1047 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1049 objArrayHandle cp_patches_h;
1050 if (cp_patches_jh != NULL) {
1051 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1052 if (!p->is_objArray())
1053 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1054 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1055 }
1057 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class)));
1058 const char* host_source = host_klass->external_name();
1059 Handle host_loader(THREAD, host_klass->class_loader());
1060 Handle host_domain(THREAD, host_klass->protection_domain());
1062 GrowableArray<Handle>* cp_patches = NULL;
1063 if (cp_patches_h.not_null()) {
1064 int alen = cp_patches_h->length();
1065 for (int i = alen-1; i >= 0; i--) {
1066 oop p = cp_patches_h->obj_at(i);
1067 if (p != NULL) {
1068 Handle patch(THREAD, p);
1069 if (cp_patches == NULL)
1070 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1071 cp_patches->at_put(i, patch);
1072 }
1073 }
1074 }
1076 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1078 instanceKlassHandle anon_klass;
1079 {
1080 Symbol* no_class_name = NULL;
1081 Klass* anonk = SystemDictionary::parse_stream(no_class_name,
1082 host_loader, host_domain,
1083 &st, host_klass, cp_patches,
1084 CHECK_NULL);
1085 if (anonk == NULL) return NULL;
1086 anon_klass = instanceKlassHandle(THREAD, anonk);
1087 }
1089 return anon_klass;
1090 }
1092 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1093 {
1094 instanceKlassHandle anon_klass;
1095 jobject res_jh = NULL;
1097 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1098 ResourceMark rm(THREAD);
1100 HeapWord* temp_alloc = NULL;
1102 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data,
1103 cp_patches_jh,
1104 &temp_alloc, THREAD);
1105 if (anon_klass() != NULL)
1106 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
1108 // try/finally clause:
1109 if (temp_alloc != NULL) {
1110 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal);
1111 }
1113 // The anonymous class loader data has been artificially been kept alive to
1114 // this point. The mirror and any instances of this class have to keep
1115 // it alive afterwards.
1116 if (anon_klass() != NULL) {
1117 anon_klass->class_loader_data()->set_keep_alive(false);
1118 }
1120 // let caller initialize it as needed...
1122 return (jclass) res_jh;
1123 }
1124 UNSAFE_END
1128 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1129 UnsafeWrapper("Unsafe_MonitorEnter");
1130 {
1131 if (jobj == NULL) {
1132 THROW(vmSymbols::java_lang_NullPointerException());
1133 }
1134 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1135 ObjectSynchronizer::jni_enter(obj, CHECK);
1136 }
1137 UNSAFE_END
1140 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1141 UnsafeWrapper("Unsafe_TryMonitorEnter");
1142 {
1143 if (jobj == NULL) {
1144 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1145 }
1146 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1147 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1148 return (res ? JNI_TRUE : JNI_FALSE);
1149 }
1150 UNSAFE_END
1153 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1154 UnsafeWrapper("Unsafe_MonitorExit");
1155 {
1156 if (jobj == NULL) {
1157 THROW(vmSymbols::java_lang_NullPointerException());
1158 }
1159 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1160 ObjectSynchronizer::jni_exit(obj(), CHECK);
1161 }
1162 UNSAFE_END
1165 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1166 UnsafeWrapper("Unsafe_ThrowException");
1167 {
1168 ThreadToNativeFromVM ttnfv(thread);
1169 env->Throw(thr);
1170 }
1171 UNSAFE_END
1173 // JSR166 ------------------------------------------------------------------
1175 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1176 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1177 oop x = JNIHandles::resolve(x_h);
1178 oop e = JNIHandles::resolve(e_h);
1179 oop p = JNIHandles::resolve(obj);
1180 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1181 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
1182 jboolean success = (res == e);
1183 if (success)
1184 update_barrier_set((void*)addr, x);
1185 return success;
1186 UNSAFE_END
1188 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1189 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1190 oop p = JNIHandles::resolve(obj);
1191 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1192 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1193 UNSAFE_END
1195 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1196 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1197 Handle p (THREAD, JNIHandles::resolve(obj));
1198 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1199 if (VM_Version::supports_cx8())
1200 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1201 else {
1202 jboolean success = false;
1203 ObjectLocker ol(p, THREAD);
1204 if (*addr == e) { *addr = x; success = true; }
1205 return success;
1206 }
1207 UNSAFE_END
1209 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1210 UnsafeWrapper("Unsafe_Park");
1211 EventThreadPark event;
1212 #ifndef USDT2
1213 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1214 #else /* USDT2 */
1215 HOTSPOT_THREAD_PARK_BEGIN(
1216 (uintptr_t) thread->parker(), (int) isAbsolute, time);
1217 #endif /* USDT2 */
1218 JavaThreadParkedState jtps(thread, time != 0);
1219 thread->parker()->park(isAbsolute != 0, time);
1220 #ifndef USDT2
1221 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1222 #else /* USDT2 */
1223 HOTSPOT_THREAD_PARK_END(
1224 (uintptr_t) thread->parker());
1225 #endif /* USDT2 */
1226 if (event.should_commit()) {
1227 oop obj = thread->current_park_blocker();
1228 event.set_klass((obj != NULL) ? obj->klass() : NULL);
1229 event.set_timeout(time);
1230 event.set_address((obj != NULL) ? (TYPE_ADDRESS) cast_from_oop<uintptr_t>(obj) : 0);
1231 event.commit();
1232 }
1233 UNSAFE_END
1235 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1236 UnsafeWrapper("Unsafe_Unpark");
1237 Parker* p = NULL;
1238 if (jthread != NULL) {
1239 oop java_thread = JNIHandles::resolve_non_null(jthread);
1240 if (java_thread != NULL) {
1241 jlong lp = java_lang_Thread::park_event(java_thread);
1242 if (lp != 0) {
1243 // This cast is OK even though the jlong might have been read
1244 // non-atomically on 32bit systems, since there, one word will
1245 // always be zero anyway and the value set is always the same
1246 p = (Parker*)addr_from_java(lp);
1247 } else {
1248 // Grab lock if apparently null or using older version of library
1249 MutexLocker mu(Threads_lock);
1250 java_thread = JNIHandles::resolve_non_null(jthread);
1251 if (java_thread != NULL) {
1252 JavaThread* thr = java_lang_Thread::thread(java_thread);
1253 if (thr != NULL) {
1254 p = thr->parker();
1255 if (p != NULL) { // Bind to Java thread for next time.
1256 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1257 }
1258 }
1259 }
1260 }
1261 }
1262 }
1263 if (p != NULL) {
1264 #ifndef USDT2
1265 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1266 #else /* USDT2 */
1267 HOTSPOT_THREAD_UNPARK(
1268 (uintptr_t) p);
1269 #endif /* USDT2 */
1270 p->unpark();
1271 }
1272 UNSAFE_END
1274 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1275 UnsafeWrapper("Unsafe_Loadavg");
1276 const int max_nelem = 3;
1277 double la[max_nelem];
1278 jint ret;
1280 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1281 assert(a->is_typeArray(), "must be type array");
1283 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1284 ThreadToNativeFromVM ttnfv(thread);
1285 throw_new(env, "ArrayIndexOutOfBoundsException");
1286 return -1;
1287 }
1289 ret = os::loadavg(la, nelem);
1290 if (ret == -1) return -1;
1292 // if successful, ret is the number of samples actually retrieved.
1293 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1294 switch(ret) {
1295 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1296 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1297 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1298 }
1299 return ret;
1300 UNSAFE_END
1302 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1303 UnsafeWrapper("Unsafe_PrefetchRead");
1304 oop p = JNIHandles::resolve(obj);
1305 void* addr = index_oop_from_field_offset_long(p, 0);
1306 Prefetch::read(addr, (intx)offset);
1307 UNSAFE_END
1309 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1310 UnsafeWrapper("Unsafe_PrefetchWrite");
1311 oop p = JNIHandles::resolve(obj);
1312 void* addr = index_oop_from_field_offset_long(p, 0);
1313 Prefetch::write(addr, (intx)offset);
1314 UNSAFE_END
1317 /// JVM_RegisterUnsafeMethods
1319 #define ADR "J"
1321 #define LANG "Ljava/lang/"
1323 #define OBJ LANG"Object;"
1324 #define CLS LANG"Class;"
1325 #define CTR LANG"reflect/Constructor;"
1326 #define FLD LANG"reflect/Field;"
1327 #define MTH LANG"reflect/Method;"
1328 #define THR LANG"Throwable;"
1330 #define DC0_Args LANG"String;[BII"
1331 #define DC_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1333 #define CC (char*) /*cast a literal from (const char*)*/
1334 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1336 // define deprecated accessors for compabitility with 1.4.0
1337 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1338 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1339 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1341 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1342 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1343 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1344 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1346 // Note: In 1.5.0, there are volatile versions too
1347 #define DECLARE_GETSETOOP(Boolean, Z) \
1348 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1349 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1350 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1351 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1354 #define DECLARE_GETSETNATIVE(Byte, B) \
1355 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1356 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1360 // These are the methods for 1.4.0
1361 static JNINativeMethod methods_140[] = {
1362 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)},
1363 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)},
1365 DECLARE_GETSETOOP_140(Boolean, Z),
1366 DECLARE_GETSETOOP_140(Byte, B),
1367 DECLARE_GETSETOOP_140(Short, S),
1368 DECLARE_GETSETOOP_140(Char, C),
1369 DECLARE_GETSETOOP_140(Int, I),
1370 DECLARE_GETSETOOP_140(Long, J),
1371 DECLARE_GETSETOOP_140(Float, F),
1372 DECLARE_GETSETOOP_140(Double, D),
1374 DECLARE_GETSETNATIVE(Byte, B),
1375 DECLARE_GETSETNATIVE(Short, S),
1376 DECLARE_GETSETNATIVE(Char, C),
1377 DECLARE_GETSETNATIVE(Int, I),
1378 DECLARE_GETSETNATIVE(Long, J),
1379 DECLARE_GETSETNATIVE(Float, F),
1380 DECLARE_GETSETNATIVE(Double, D),
1382 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1383 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1385 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1386 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1387 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1389 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)},
1390 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)},
1391 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1392 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1393 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1394 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1395 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1397 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1398 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1399 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1400 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1401 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1402 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1403 };
1405 // These are the methods prior to the JSR 166 changes in 1.5.0
1406 static JNINativeMethod methods_141[] = {
1407 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1408 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1410 DECLARE_GETSETOOP_141(Boolean, Z),
1411 DECLARE_GETSETOOP_141(Byte, B),
1412 DECLARE_GETSETOOP_141(Short, S),
1413 DECLARE_GETSETOOP_141(Char, C),
1414 DECLARE_GETSETOOP_141(Int, I),
1415 DECLARE_GETSETOOP_141(Long, J),
1416 DECLARE_GETSETOOP_141(Float, F),
1417 DECLARE_GETSETOOP_141(Double, D),
1419 DECLARE_GETSETNATIVE(Byte, B),
1420 DECLARE_GETSETNATIVE(Short, S),
1421 DECLARE_GETSETNATIVE(Char, C),
1422 DECLARE_GETSETNATIVE(Int, I),
1423 DECLARE_GETSETNATIVE(Long, J),
1424 DECLARE_GETSETNATIVE(Float, F),
1425 DECLARE_GETSETNATIVE(Double, D),
1427 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1428 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1430 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1431 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1432 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1434 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1435 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1436 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1437 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1438 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1439 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1440 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1441 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1443 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1444 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1445 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1446 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1447 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1448 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1450 };
1452 // These are the methods prior to the JSR 166 changes in 1.6.0
1453 static JNINativeMethod methods_15[] = {
1454 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1455 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1456 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1457 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1460 DECLARE_GETSETOOP(Boolean, Z),
1461 DECLARE_GETSETOOP(Byte, B),
1462 DECLARE_GETSETOOP(Short, S),
1463 DECLARE_GETSETOOP(Char, C),
1464 DECLARE_GETSETOOP(Int, I),
1465 DECLARE_GETSETOOP(Long, J),
1466 DECLARE_GETSETOOP(Float, F),
1467 DECLARE_GETSETOOP(Double, D),
1469 DECLARE_GETSETNATIVE(Byte, B),
1470 DECLARE_GETSETNATIVE(Short, S),
1471 DECLARE_GETSETNATIVE(Char, C),
1472 DECLARE_GETSETNATIVE(Int, I),
1473 DECLARE_GETSETNATIVE(Long, J),
1474 DECLARE_GETSETNATIVE(Float, F),
1475 DECLARE_GETSETNATIVE(Double, D),
1477 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1478 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1480 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1481 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1482 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1484 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1485 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1486 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1487 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1488 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1489 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1490 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1491 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1493 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1494 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1495 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1496 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1497 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1498 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1499 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1500 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1501 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1502 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1503 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1505 };
1507 // These are the methods for 1.6.0 and 1.7.0
1508 static JNINativeMethod methods_16[] = {
1509 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1510 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1511 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1512 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1514 DECLARE_GETSETOOP(Boolean, Z),
1515 DECLARE_GETSETOOP(Byte, B),
1516 DECLARE_GETSETOOP(Short, S),
1517 DECLARE_GETSETOOP(Char, C),
1518 DECLARE_GETSETOOP(Int, I),
1519 DECLARE_GETSETOOP(Long, J),
1520 DECLARE_GETSETOOP(Float, F),
1521 DECLARE_GETSETOOP(Double, D),
1523 DECLARE_GETSETNATIVE(Byte, B),
1524 DECLARE_GETSETNATIVE(Short, S),
1525 DECLARE_GETSETNATIVE(Char, C),
1526 DECLARE_GETSETNATIVE(Int, I),
1527 DECLARE_GETSETNATIVE(Long, J),
1528 DECLARE_GETSETNATIVE(Float, F),
1529 DECLARE_GETSETNATIVE(Double, D),
1531 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1532 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1534 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1535 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1536 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1538 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1539 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1540 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1541 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1542 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1543 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1544 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1545 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1547 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1548 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1549 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1550 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1551 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1552 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1553 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1554 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1555 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1556 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1557 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1558 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1559 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1560 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1561 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1562 };
1564 // These are the methods for 1.8.0
1565 static JNINativeMethod methods_18[] = {
1566 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1567 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1568 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1569 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1571 DECLARE_GETSETOOP(Boolean, Z),
1572 DECLARE_GETSETOOP(Byte, B),
1573 DECLARE_GETSETOOP(Short, S),
1574 DECLARE_GETSETOOP(Char, C),
1575 DECLARE_GETSETOOP(Int, I),
1576 DECLARE_GETSETOOP(Long, J),
1577 DECLARE_GETSETOOP(Float, F),
1578 DECLARE_GETSETOOP(Double, D),
1580 DECLARE_GETSETNATIVE(Byte, B),
1581 DECLARE_GETSETNATIVE(Short, S),
1582 DECLARE_GETSETNATIVE(Char, C),
1583 DECLARE_GETSETNATIVE(Int, I),
1584 DECLARE_GETSETNATIVE(Long, J),
1585 DECLARE_GETSETNATIVE(Float, F),
1586 DECLARE_GETSETNATIVE(Double, D),
1588 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1589 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1591 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1592 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1593 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1595 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1596 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1597 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1598 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1599 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1600 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1601 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1602 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1604 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1605 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1606 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1607 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1608 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1609 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1610 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1611 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1612 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1613 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1614 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1615 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1616 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1617 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1618 };
1620 JNINativeMethod loadavg_method[] = {
1621 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1622 };
1624 JNINativeMethod prefetch_methods[] = {
1625 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1626 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1627 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1628 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1629 };
1631 JNINativeMethod memcopy_methods_17[] = {
1632 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1633 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1634 };
1636 JNINativeMethod memcopy_methods_15[] = {
1637 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1638 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1639 };
1641 JNINativeMethod anonk_methods[] = {
1642 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1643 };
1645 JNINativeMethod lform_methods[] = {
1646 {CC"shouldBeInitialized",CC"("CLS")Z", FN_PTR(Unsafe_ShouldBeInitialized)},
1647 };
1649 JNINativeMethod fence_methods[] = {
1650 {CC"loadFence", CC"()V", FN_PTR(Unsafe_LoadFence)},
1651 {CC"storeFence", CC"()V", FN_PTR(Unsafe_StoreFence)},
1652 {CC"fullFence", CC"()V", FN_PTR(Unsafe_FullFence)},
1653 };
1655 #undef CC
1656 #undef FN_PTR
1658 #undef ADR
1659 #undef LANG
1660 #undef OBJ
1661 #undef CLS
1662 #undef CTR
1663 #undef FLD
1664 #undef MTH
1665 #undef THR
1666 #undef DC0_Args
1667 #undef DC_Args
1669 #undef DECLARE_GETSETOOP
1670 #undef DECLARE_GETSETNATIVE
1673 /**
1674 * Helper method to register native methods.
1675 */
1676 static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1677 int status = env->RegisterNatives(clazz, methods, nMethods);
1678 if (status < 0 || env->ExceptionOccurred()) {
1679 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1680 tty->print_cr("Unsafe: failed registering %s", message);
1681 }
1682 env->ExceptionClear();
1683 return false;
1684 } else {
1685 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1686 tty->print_cr("Unsafe: successfully registered %s", message);
1687 }
1688 return true;
1689 }
1690 }
1693 // This one function is exported, used by NativeLookup.
1694 // The Unsafe_xxx functions above are called only from the interpreter.
1695 // The optimizer looks at names and signatures to recognize
1696 // individual functions.
1698 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1699 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1700 {
1701 ThreadToNativeFromVM ttnfv(thread);
1703 // Unsafe methods
1704 {
1705 bool success = false;
1706 // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6
1707 if (!success) {
1708 success = register_natives("1.6 methods", env, unsafecls, methods_16, sizeof(methods_16)/sizeof(JNINativeMethod));
1709 }
1710 if (!success) {
1711 success = register_natives("1.8 methods", env, unsafecls, methods_18, sizeof(methods_18)/sizeof(JNINativeMethod));
1712 }
1713 if (!success) {
1714 success = register_natives("1.5 methods", env, unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1715 }
1716 if (!success) {
1717 success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1718 }
1719 if (!success) {
1720 success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1721 }
1722 guarantee(success, "register unsafe natives");
1723 }
1725 // Unsafe.getLoadAverage
1726 register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1728 // Prefetch methods
1729 register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1731 // Memory copy methods
1732 {
1733 bool success = false;
1734 if (!success) {
1735 success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod));
1736 }
1737 if (!success) {
1738 success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1739 }
1740 }
1742 // Unsafe.defineAnonymousClass
1743 if (EnableInvokeDynamic) {
1744 register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1745 }
1747 // Unsafe.shouldBeInitialized
1748 if (EnableInvokeDynamic) {
1749 register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod));
1750 }
1752 // Fence methods
1753 register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod));
1754 }
1755 JVM_END
