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src/share/vm/prims/unsafe.cpp@04ff2f6cd0eb
src/share/vm/prims/unsafe.cpp
Tue, 17 Oct 2017 12:58:25 +0800
- author
- aoqi
- date
- Tue, 17 Oct 2017 12:58:25 +0800
- changeset 7994
- 04ff2f6cd0eb
- parent 7547
- f46871c6c063
- parent 7535
- 7ae4e26cb1e0
- child 8604
- 04d83ba48607
- permissions
- -rw-r--r--
merge
1 /*
2 * Copyright (c) 2000, 2014, 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/prefetch.inline.hpp"
37 #include "runtime/orderAccess.inline.hpp"
38 #include "runtime/reflection.hpp"
39 #include "runtime/synchronizer.hpp"
40 #include "services/threadService.hpp"
41 #include "trace/tracing.hpp"
42 #include "utilities/copy.hpp"
43 #include "utilities/dtrace.hpp"
45 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
47 /*
48 * Implementation of class sun.misc.Unsafe
49 */
51 #ifndef USDT2
52 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long);
53 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t);
54 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t);
55 #endif /* !USDT2 */
57 #define MAX_OBJECT_SIZE \
58 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
59 + ((julong)max_jint * sizeof(double)) )
62 #define UNSAFE_ENTRY(result_type, header) \
63 JVM_ENTRY(result_type, header)
65 // Can't use UNSAFE_LEAF because it has the signature of a straight
66 // call into the runtime (just like JVM_LEAF, funny that) but it's
67 // called like a Java Native and thus the wrapper built for it passes
68 // arguments like a JNI call. It expects those arguments to be popped
69 // from the stack on Intel like all good JNI args are, and adjusts the
70 // stack according. Since the JVM_LEAF call expects no extra
71 // arguments the stack isn't popped in the C code, is pushed by the
72 // wrapper and we get sick.
73 //#define UNSAFE_LEAF(result_type, header) \
74 // JVM_LEAF(result_type, header)
76 #define UNSAFE_END JVM_END
78 #define UnsafeWrapper(arg) /*nothing, for the present*/
81 inline void* addr_from_java(jlong addr) {
82 // This assert fails in a variety of ways on 32-bit systems.
83 // It is impossible to predict whether native code that converts
84 // pointers to longs will sign-extend or zero-extend the addresses.
85 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
86 return (void*)(uintptr_t)addr;
87 }
89 inline jlong addr_to_java(void* p) {
90 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
91 return (uintptr_t)p;
92 }
95 // Note: The VM's obj_field and related accessors use byte-scaled
96 // ("unscaled") offsets, just as the unsafe methods do.
98 // However, the method Unsafe.fieldOffset explicitly declines to
99 // guarantee this. The field offset values manipulated by the Java user
100 // through the Unsafe API are opaque cookies that just happen to be byte
101 // offsets. We represent this state of affairs by passing the cookies
102 // through conversion functions when going between the VM and the Unsafe API.
103 // The conversion functions just happen to be no-ops at present.
105 inline jlong field_offset_to_byte_offset(jlong field_offset) {
106 return field_offset;
107 }
109 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
110 return byte_offset;
111 }
113 inline jint invocation_key_from_method_slot(jint slot) {
114 return slot;
115 }
117 inline jint invocation_key_to_method_slot(jint key) {
118 return key;
119 }
121 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
122 jlong byte_offset = field_offset_to_byte_offset(field_offset);
123 #ifdef ASSERT
124 if (p != NULL) {
125 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
126 if (byte_offset == (jint)byte_offset) {
127 void* ptr_plus_disp = (address)p + byte_offset;
128 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
129 "raw [ptr+disp] must be consistent with oop::field_base");
130 }
131 jlong p_size = HeapWordSize * (jlong)(p->size());
132 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size));
133 }
134 #endif
135 if (sizeof(char*) == sizeof(jint)) // (this constant folds!)
136 return (address)p + (jint) byte_offset;
137 else
138 return (address)p + byte_offset;
139 }
141 // Externally callable versions:
142 // (Use these in compiler intrinsics which emulate unsafe primitives.)
143 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
144 return field_offset;
145 }
146 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
147 return byte_offset;
148 }
149 jint Unsafe_invocation_key_from_method_slot(jint slot) {
150 return invocation_key_from_method_slot(slot);
151 }
152 jint Unsafe_invocation_key_to_method_slot(jint key) {
153 return invocation_key_to_method_slot(key);
154 }
157 ///// Data in the Java heap.
159 #define GET_FIELD(obj, offset, type_name, v) \
160 oop p = JNIHandles::resolve(obj); \
161 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
163 #define SET_FIELD(obj, offset, type_name, x) \
164 oop p = JNIHandles::resolve(obj); \
165 *(type_name*)index_oop_from_field_offset_long(p, offset) = x
167 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
168 oop p = JNIHandles::resolve(obj); \
169 if (support_IRIW_for_not_multiple_copy_atomic_cpu) { \
170 OrderAccess::fence(); \
171 } \
172 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
174 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
175 oop p = JNIHandles::resolve(obj); \
176 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x);
178 // Macros for oops that check UseCompressedOops
180 #define GET_OOP_FIELD(obj, offset, v) \
181 oop p = JNIHandles::resolve(obj); \
182 oop v; \
183 if (UseCompressedOops) { \
184 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
185 v = oopDesc::decode_heap_oop(n); \
186 } else { \
187 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
188 }
191 // Get/SetObject must be special-cased, since it works with handles.
193 // The xxx140 variants for backward compatibility do not allow a full-width offset.
194 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
195 UnsafeWrapper("Unsafe_GetObject");
196 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
197 GET_OOP_FIELD(obj, offset, v)
198 jobject ret = JNIHandles::make_local(env, v);
199 #if INCLUDE_ALL_GCS
200 // We could be accessing the referent field in a reference
201 // object. If G1 is enabled then we need to register a non-null
202 // referent with the SATB barrier.
203 if (UseG1GC) {
204 bool needs_barrier = false;
206 if (ret != NULL) {
207 if (offset == java_lang_ref_Reference::referent_offset) {
208 oop o = JNIHandles::resolve_non_null(obj);
209 Klass* k = o->klass();
210 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
211 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
212 needs_barrier = true;
213 }
214 }
215 }
217 if (needs_barrier) {
218 oop referent = JNIHandles::resolve(ret);
219 G1SATBCardTableModRefBS::enqueue(referent);
220 }
221 }
222 #endif // INCLUDE_ALL_GCS
223 return ret;
224 UNSAFE_END
226 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
227 UnsafeWrapper("Unsafe_SetObject");
228 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
229 oop x = JNIHandles::resolve(x_h);
230 //SET_FIELD(obj, offset, oop, x);
231 oop p = JNIHandles::resolve(obj);
232 if (UseCompressedOops) {
233 if (x != NULL) {
234 // If there is a heap base pointer, we are obliged to emit a store barrier.
235 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
236 } else {
237 narrowOop n = oopDesc::encode_heap_oop_not_null(x);
238 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
239 }
240 } else {
241 if (x != NULL) {
242 // If there is a heap base pointer, we are obliged to emit a store barrier.
243 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
244 } else {
245 *(oop*)index_oop_from_field_offset_long(p, offset) = x;
246 }
247 }
248 UNSAFE_END
250 // The normal variants allow a null base pointer with an arbitrary address.
251 // But if the base pointer is non-null, the offset should make some sense.
252 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
253 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
254 UnsafeWrapper("Unsafe_GetObject");
255 GET_OOP_FIELD(obj, offset, v)
256 jobject ret = JNIHandles::make_local(env, v);
257 #if INCLUDE_ALL_GCS
258 // We could be accessing the referent field in a reference
259 // object. If G1 is enabled then we need to register non-null
260 // referent with the SATB barrier.
261 if (UseG1GC) {
262 bool needs_barrier = false;
264 if (ret != NULL) {
265 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) {
266 oop o = JNIHandles::resolve(obj);
267 Klass* k = o->klass();
268 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
269 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
270 needs_barrier = true;
271 }
272 }
273 }
275 if (needs_barrier) {
276 oop referent = JNIHandles::resolve(ret);
277 G1SATBCardTableModRefBS::enqueue(referent);
278 }
279 }
280 #endif // INCLUDE_ALL_GCS
281 return ret;
282 UNSAFE_END
284 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
285 UnsafeWrapper("Unsafe_SetObject");
286 oop x = JNIHandles::resolve(x_h);
287 oop p = JNIHandles::resolve(obj);
288 if (UseCompressedOops) {
289 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
290 } else {
291 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
292 }
293 UNSAFE_END
295 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
296 UnsafeWrapper("Unsafe_GetObjectVolatile");
297 oop p = JNIHandles::resolve(obj);
298 void* addr = index_oop_from_field_offset_long(p, offset);
299 volatile oop v;
300 if (UseCompressedOops) {
301 volatile narrowOop n = *(volatile narrowOop*) addr;
302 (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n));
303 } else {
304 (void)const_cast<oop&>(v = *(volatile oop*) addr);
305 }
306 OrderAccess::acquire();
307 return JNIHandles::make_local(env, v);
308 UNSAFE_END
310 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
311 UnsafeWrapper("Unsafe_SetObjectVolatile");
312 oop x = JNIHandles::resolve(x_h);
313 oop p = JNIHandles::resolve(obj);
314 void* addr = index_oop_from_field_offset_long(p, offset);
315 OrderAccess::release();
316 if (UseCompressedOops) {
317 oop_store((narrowOop*)addr, x);
318 } else {
319 oop_store((oop*)addr, x);
320 }
321 OrderAccess::fence();
322 UNSAFE_END
324 #ifndef SUPPORTS_NATIVE_CX8
326 // VM_Version::supports_cx8() is a surrogate for 'supports atomic long memory ops'.
327 //
328 // On platforms which do not support atomic compare-and-swap of jlong (8 byte)
329 // values we have to use a lock-based scheme to enforce atomicity. This has to be
330 // applied to all Unsafe operations that set the value of a jlong field. Even so
331 // the compareAndSwapLong operation will not be atomic with respect to direct stores
332 // to the field from Java code. It is important therefore that any Java code that
333 // utilizes these Unsafe jlong operations does not perform direct stores. To permit
334 // direct loads of the field from Java code we must also use Atomic::store within the
335 // locked regions. And for good measure, in case there are direct stores, we also
336 // employ Atomic::load within those regions. Note that the field in question must be
337 // volatile and so must have atomic load/store accesses applied at the Java level.
338 //
339 // The locking scheme could utilize a range of strategies for controlling the locking
340 // granularity: from a lock per-field through to a single global lock. The latter is
341 // the simplest and is used for the current implementation. Note that the Java object
342 // that contains the field, can not, in general, be used for locking. To do so can lead
343 // to deadlocks as we may introduce locking into what appears to the Java code to be a
344 // lock-free path.
345 //
346 // As all the locked-regions are very short and themselves non-blocking we can treat
347 // them as leaf routines and elide safepoint checks (ie we don't perform any thread
348 // state transitions even when blocking for the lock). Note that if we do choose to
349 // add safepoint checks and thread state transitions, we must ensure that we calculate
350 // the address of the field _after_ we have acquired the lock, else the object may have
351 // been moved by the GC
353 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
354 UnsafeWrapper("Unsafe_GetLongVolatile");
355 {
356 if (VM_Version::supports_cx8()) {
357 GET_FIELD_VOLATILE(obj, offset, jlong, v);
358 return v;
359 }
360 else {
361 Handle p (THREAD, JNIHandles::resolve(obj));
362 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
363 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
364 jlong value = Atomic::load(addr);
365 return value;
366 }
367 }
368 UNSAFE_END
370 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
371 UnsafeWrapper("Unsafe_SetLongVolatile");
372 {
373 if (VM_Version::supports_cx8()) {
374 SET_FIELD_VOLATILE(obj, offset, jlong, x);
375 }
376 else {
377 Handle p (THREAD, JNIHandles::resolve(obj));
378 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
379 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
380 Atomic::store(x, addr);
381 }
382 }
383 UNSAFE_END
385 #endif // not SUPPORTS_NATIVE_CX8
387 #define DEFINE_GETSETOOP(jboolean, Boolean) \
388 \
389 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
390 UnsafeWrapper("Unsafe_Get"#Boolean); \
391 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \
392 GET_FIELD(obj, offset, jboolean, v); \
393 return v; \
394 UNSAFE_END \
395 \
396 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
397 UnsafeWrapper("Unsafe_Set"#Boolean); \
398 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \
399 SET_FIELD(obj, offset, jboolean, x); \
400 UNSAFE_END \
401 \
402 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
403 UnsafeWrapper("Unsafe_Get"#Boolean); \
404 GET_FIELD(obj, offset, jboolean, v); \
405 return v; \
406 UNSAFE_END \
407 \
408 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
409 UnsafeWrapper("Unsafe_Set"#Boolean); \
410 SET_FIELD(obj, offset, jboolean, x); \
411 UNSAFE_END \
412 \
413 // END DEFINE_GETSETOOP.
415 DEFINE_GETSETOOP(jboolean, Boolean)
416 DEFINE_GETSETOOP(jbyte, Byte)
417 DEFINE_GETSETOOP(jshort, Short);
418 DEFINE_GETSETOOP(jchar, Char);
419 DEFINE_GETSETOOP(jint, Int);
420 DEFINE_GETSETOOP(jlong, Long);
421 DEFINE_GETSETOOP(jfloat, Float);
422 DEFINE_GETSETOOP(jdouble, Double);
424 #undef DEFINE_GETSETOOP
426 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
427 \
428 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
429 UnsafeWrapper("Unsafe_Get"#Boolean); \
430 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
431 return v; \
432 UNSAFE_END \
433 \
434 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
435 UnsafeWrapper("Unsafe_Set"#Boolean); \
436 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
437 UNSAFE_END \
438 \
439 // END DEFINE_GETSETOOP_VOLATILE.
441 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
442 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
443 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
444 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
445 DEFINE_GETSETOOP_VOLATILE(jint, Int);
446 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
447 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
449 #ifdef SUPPORTS_NATIVE_CX8
450 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
451 #endif
453 #undef DEFINE_GETSETOOP_VOLATILE
455 // The non-intrinsified versions of setOrdered just use setVolatile
457 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
458 UnsafeWrapper("Unsafe_SetOrderedInt");
459 SET_FIELD_VOLATILE(obj, offset, jint, x);
460 UNSAFE_END
462 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
463 UnsafeWrapper("Unsafe_SetOrderedObject");
464 oop x = JNIHandles::resolve(x_h);
465 oop p = JNIHandles::resolve(obj);
466 void* addr = index_oop_from_field_offset_long(p, offset);
467 OrderAccess::release();
468 if (UseCompressedOops) {
469 oop_store((narrowOop*)addr, x);
470 } else {
471 oop_store((oop*)addr, x);
472 }
473 OrderAccess::fence();
474 UNSAFE_END
476 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
477 UnsafeWrapper("Unsafe_SetOrderedLong");
478 #ifdef SUPPORTS_NATIVE_CX8
479 SET_FIELD_VOLATILE(obj, offset, jlong, x);
480 #else
481 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
482 {
483 if (VM_Version::supports_cx8()) {
484 SET_FIELD_VOLATILE(obj, offset, jlong, x);
485 }
486 else {
487 Handle p (THREAD, JNIHandles::resolve(obj));
488 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
489 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
490 Atomic::store(x, addr);
491 }
492 }
493 #endif
494 UNSAFE_END
496 UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe))
497 UnsafeWrapper("Unsafe_LoadFence");
498 OrderAccess::acquire();
499 UNSAFE_END
501 UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe))
502 UnsafeWrapper("Unsafe_StoreFence");
503 OrderAccess::release();
504 UNSAFE_END
506 UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe))
507 UnsafeWrapper("Unsafe_FullFence");
508 OrderAccess::fence();
509 UNSAFE_END
511 ////// Data in the C heap.
513 // Note: These do not throw NullPointerException for bad pointers.
514 // They just crash. Only a oop base pointer can generate a NullPointerException.
515 //
516 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
517 \
518 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
519 UnsafeWrapper("Unsafe_GetNative"#Type); \
520 void* p = addr_from_java(addr); \
521 JavaThread* t = JavaThread::current(); \
522 t->set_doing_unsafe_access(true); \
523 java_type x = *(volatile native_type*)p; \
524 t->set_doing_unsafe_access(false); \
525 return x; \
526 UNSAFE_END \
527 \
528 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
529 UnsafeWrapper("Unsafe_SetNative"#Type); \
530 JavaThread* t = JavaThread::current(); \
531 t->set_doing_unsafe_access(true); \
532 void* p = addr_from_java(addr); \
533 *(volatile native_type*)p = x; \
534 t->set_doing_unsafe_access(false); \
535 UNSAFE_END \
536 \
537 // END DEFINE_GETSETNATIVE.
539 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
540 DEFINE_GETSETNATIVE(jshort, Short, signed short);
541 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
542 DEFINE_GETSETNATIVE(jint, Int, jint);
543 // no long -- handled specially
544 DEFINE_GETSETNATIVE(jfloat, Float, float);
545 DEFINE_GETSETNATIVE(jdouble, Double, double);
547 #undef DEFINE_GETSETNATIVE
549 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
550 UnsafeWrapper("Unsafe_GetNativeLong");
551 JavaThread* t = JavaThread::current();
552 // We do it this way to avoid problems with access to heap using 64
553 // bit loads, as jlong in heap could be not 64-bit aligned, and on
554 // some CPUs (SPARC) it leads to SIGBUS.
555 t->set_doing_unsafe_access(true);
556 void* p = addr_from_java(addr);
557 jlong x;
558 if (((intptr_t)p & 7) == 0) {
559 // jlong is aligned, do a volatile access
560 x = *(volatile jlong*)p;
561 } else {
562 jlong_accessor acc;
563 acc.words[0] = ((volatile jint*)p)[0];
564 acc.words[1] = ((volatile jint*)p)[1];
565 x = acc.long_value;
566 }
567 t->set_doing_unsafe_access(false);
568 return x;
569 UNSAFE_END
571 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
572 UnsafeWrapper("Unsafe_SetNativeLong");
573 JavaThread* t = JavaThread::current();
574 // see comment for Unsafe_GetNativeLong
575 t->set_doing_unsafe_access(true);
576 void* p = addr_from_java(addr);
577 if (((intptr_t)p & 7) == 0) {
578 // jlong is aligned, do a volatile access
579 *(volatile jlong*)p = x;
580 } else {
581 jlong_accessor acc;
582 acc.long_value = x;
583 ((volatile jint*)p)[0] = acc.words[0];
584 ((volatile jint*)p)[1] = acc.words[1];
585 }
586 t->set_doing_unsafe_access(false);
587 UNSAFE_END
590 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
591 UnsafeWrapper("Unsafe_GetNativeAddress");
592 void* p = addr_from_java(addr);
593 return addr_to_java(*(void**)p);
594 UNSAFE_END
596 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
597 UnsafeWrapper("Unsafe_SetNativeAddress");
598 void* p = addr_from_java(addr);
599 *(void**)p = addr_from_java(x);
600 UNSAFE_END
603 ////// Allocation requests
605 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
606 UnsafeWrapper("Unsafe_AllocateInstance");
607 {
608 ThreadToNativeFromVM ttnfv(thread);
609 return env->AllocObject(cls);
610 }
611 UNSAFE_END
613 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
614 UnsafeWrapper("Unsafe_AllocateMemory");
615 size_t sz = (size_t)size;
616 if (sz != (julong)size || size < 0) {
617 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
618 }
619 if (sz == 0) {
620 return 0;
621 }
622 sz = round_to(sz, HeapWordSize);
623 void* x = os::malloc(sz, mtInternal);
624 if (x == NULL) {
625 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
626 }
627 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
628 return addr_to_java(x);
629 UNSAFE_END
631 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
632 UnsafeWrapper("Unsafe_ReallocateMemory");
633 void* p = addr_from_java(addr);
634 size_t sz = (size_t)size;
635 if (sz != (julong)size || size < 0) {
636 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
637 }
638 if (sz == 0) {
639 os::free(p);
640 return 0;
641 }
642 sz = round_to(sz, HeapWordSize);
643 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal);
644 if (x == NULL) {
645 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
646 }
647 return addr_to_java(x);
648 UNSAFE_END
650 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
651 UnsafeWrapper("Unsafe_FreeMemory");
652 void* p = addr_from_java(addr);
653 if (p == NULL) {
654 return;
655 }
656 os::free(p);
657 UNSAFE_END
659 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
660 UnsafeWrapper("Unsafe_SetMemory");
661 size_t sz = (size_t)size;
662 if (sz != (julong)size || size < 0) {
663 THROW(vmSymbols::java_lang_IllegalArgumentException());
664 }
665 char* p = (char*) addr_from_java(addr);
666 Copy::fill_to_memory_atomic(p, sz, value);
667 UNSAFE_END
669 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
670 UnsafeWrapper("Unsafe_SetMemory");
671 size_t sz = (size_t)size;
672 if (sz != (julong)size || size < 0) {
673 THROW(vmSymbols::java_lang_IllegalArgumentException());
674 }
675 oop base = JNIHandles::resolve(obj);
676 void* p = index_oop_from_field_offset_long(base, offset);
677 Copy::fill_to_memory_atomic(p, sz, value);
678 UNSAFE_END
680 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
681 UnsafeWrapper("Unsafe_CopyMemory");
682 if (size == 0) {
683 return;
684 }
685 size_t sz = (size_t)size;
686 if (sz != (julong)size || size < 0) {
687 THROW(vmSymbols::java_lang_IllegalArgumentException());
688 }
689 void* src = addr_from_java(srcAddr);
690 void* dst = addr_from_java(dstAddr);
691 Copy::conjoint_memory_atomic(src, dst, sz);
692 UNSAFE_END
694 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
695 UnsafeWrapper("Unsafe_CopyMemory");
696 if (size == 0) {
697 return;
698 }
699 size_t sz = (size_t)size;
700 if (sz != (julong)size || size < 0) {
701 THROW(vmSymbols::java_lang_IllegalArgumentException());
702 }
703 oop srcp = JNIHandles::resolve(srcObj);
704 oop dstp = JNIHandles::resolve(dstObj);
705 if (dstp != NULL && !dstp->is_typeArray()) {
706 // NYI: This works only for non-oop arrays at present.
707 // Generalizing it would be reasonable, but requires card marking.
708 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
709 THROW(vmSymbols::java_lang_IllegalArgumentException());
710 }
711 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
712 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
713 Copy::conjoint_memory_atomic(src, dst, sz);
714 UNSAFE_END
717 ////// Random queries
719 // See comment at file start about UNSAFE_LEAF
720 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
721 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
722 UnsafeWrapper("Unsafe_AddressSize");
723 return sizeof(void*);
724 UNSAFE_END
726 // See comment at file start about UNSAFE_LEAF
727 //UNSAFE_LEAF(jint, Unsafe_PageSize())
728 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
729 UnsafeWrapper("Unsafe_PageSize");
730 return os::vm_page_size();
731 UNSAFE_END
733 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
734 if (field == NULL) {
735 THROW_0(vmSymbols::java_lang_NullPointerException());
736 }
738 oop reflected = JNIHandles::resolve_non_null(field);
739 oop mirror = java_lang_reflect_Field::clazz(reflected);
740 Klass* k = java_lang_Class::as_Klass(mirror);
741 int slot = java_lang_reflect_Field::slot(reflected);
742 int modifiers = java_lang_reflect_Field::modifiers(reflected);
744 if (must_be_static >= 0) {
745 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
746 if (must_be_static != really_is_static) {
747 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
748 }
749 }
751 int offset = InstanceKlass::cast(k)->field_offset(slot);
752 return field_offset_from_byte_offset(offset);
753 }
755 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
756 UnsafeWrapper("Unsafe_ObjectFieldOffset");
757 return find_field_offset(field, 0, THREAD);
758 UNSAFE_END
760 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
761 UnsafeWrapper("Unsafe_StaticFieldOffset");
762 return find_field_offset(field, 1, THREAD);
763 UNSAFE_END
765 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
766 UnsafeWrapper("Unsafe_StaticFieldBase");
767 // Note: In this VM implementation, a field address is always a short
768 // offset from the base of a a klass metaobject. Thus, the full dynamic
769 // range of the return type is never used. However, some implementations
770 // might put the static field inside an array shared by many classes,
771 // or even at a fixed address, in which case the address could be quite
772 // large. In that last case, this function would return NULL, since
773 // the address would operate alone, without any base pointer.
775 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
777 oop reflected = JNIHandles::resolve_non_null(field);
778 oop mirror = java_lang_reflect_Field::clazz(reflected);
779 int modifiers = java_lang_reflect_Field::modifiers(reflected);
781 if ((modifiers & JVM_ACC_STATIC) == 0) {
782 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
783 }
785 return JNIHandles::make_local(env, mirror);
786 UNSAFE_END
788 //@deprecated
789 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
790 UnsafeWrapper("Unsafe_FieldOffset");
791 // tries (but fails) to be polymorphic between static and non-static:
792 jlong offset = find_field_offset(field, -1, THREAD);
793 guarantee(offset == (jint)offset, "offset fits in 32 bits");
794 return (jint)offset;
795 UNSAFE_END
797 //@deprecated
798 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
799 UnsafeWrapper("Unsafe_StaticFieldBase");
800 if (clazz == NULL) {
801 THROW_0(vmSymbols::java_lang_NullPointerException());
802 }
803 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
804 UNSAFE_END
806 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
807 UnsafeWrapper("Unsafe_EnsureClassInitialized");
808 if (clazz == NULL) {
809 THROW(vmSymbols::java_lang_NullPointerException());
810 }
811 oop mirror = JNIHandles::resolve_non_null(clazz);
813 Klass* klass = java_lang_Class::as_Klass(mirror);
814 if (klass != NULL && klass->should_be_initialized()) {
815 InstanceKlass* k = InstanceKlass::cast(klass);
816 k->initialize(CHECK);
817 }
818 }
819 UNSAFE_END
821 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
822 UnsafeWrapper("Unsafe_ShouldBeInitialized");
823 if (clazz == NULL) {
824 THROW_(vmSymbols::java_lang_NullPointerException(), false);
825 }
826 oop mirror = JNIHandles::resolve_non_null(clazz);
827 Klass* klass = java_lang_Class::as_Klass(mirror);
828 if (klass != NULL && klass->should_be_initialized()) {
829 return true;
830 }
831 return false;
832 }
833 UNSAFE_END
835 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
836 if (acls == NULL) {
837 THROW(vmSymbols::java_lang_NullPointerException());
838 }
839 oop mirror = JNIHandles::resolve_non_null(acls);
840 Klass* k = java_lang_Class::as_Klass(mirror);
841 if (k == NULL || !k->oop_is_array()) {
842 THROW(vmSymbols::java_lang_InvalidClassException());
843 } else if (k->oop_is_objArray()) {
844 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
845 scale = heapOopSize;
846 } else if (k->oop_is_typeArray()) {
847 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
848 base = tak->array_header_in_bytes();
849 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
850 scale = (1 << tak->log2_element_size());
851 } else {
852 ShouldNotReachHere();
853 }
854 }
856 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
857 UnsafeWrapper("Unsafe_ArrayBaseOffset");
858 int base, scale;
859 getBaseAndScale(base, scale, acls, CHECK_0);
860 return field_offset_from_byte_offset(base);
861 UNSAFE_END
864 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
865 UnsafeWrapper("Unsafe_ArrayIndexScale");
866 int base, scale;
867 getBaseAndScale(base, scale, acls, CHECK_0);
868 // This VM packs both fields and array elements down to the byte.
869 // But watch out: If this changes, so that array references for
870 // a given primitive type (say, T_BOOLEAN) use different memory units
871 // than fields, this method MUST return zero for such arrays.
872 // For example, the VM used to store sub-word sized fields in full
873 // words in the object layout, so that accessors like getByte(Object,int)
874 // did not really do what one might expect for arrays. Therefore,
875 // this function used to report a zero scale factor, so that the user
876 // would know not to attempt to access sub-word array elements.
877 // // Code for unpacked fields:
878 // if (scale < wordSize) return 0;
880 // The following allows for a pretty general fieldOffset cookie scheme,
881 // but requires it to be linear in byte offset.
882 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
883 UNSAFE_END
886 static inline void throw_new(JNIEnv *env, const char *ename) {
887 char buf[100];
888 strcpy(buf, "java/lang/");
889 strcat(buf, ename);
890 jclass cls = env->FindClass(buf);
891 if (env->ExceptionCheck()) {
892 env->ExceptionClear();
893 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf);
894 return;
895 }
896 char* msg = NULL;
897 env->ThrowNew(cls, msg);
898 }
900 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
901 {
902 // Code lifted from JDK 1.3 ClassLoader.c
904 jbyte *body;
905 char *utfName;
906 jclass result = 0;
907 char buf[128];
909 if (UsePerfData) {
910 ClassLoader::unsafe_defineClassCallCounter()->inc();
911 }
913 if (data == NULL) {
914 throw_new(env, "NullPointerException");
915 return 0;
916 }
918 /* Work around 4153825. malloc crashes on Solaris when passed a
919 * negative size.
920 */
921 if (length < 0) {
922 throw_new(env, "ArrayIndexOutOfBoundsException");
923 return 0;
924 }
926 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
928 if (body == 0) {
929 throw_new(env, "OutOfMemoryError");
930 return 0;
931 }
933 env->GetByteArrayRegion(data, offset, length, body);
935 if (env->ExceptionOccurred())
936 goto free_body;
938 if (name != NULL) {
939 uint len = env->GetStringUTFLength(name);
940 int unicode_len = env->GetStringLength(name);
941 if (len >= sizeof(buf)) {
942 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
943 if (utfName == NULL) {
944 throw_new(env, "OutOfMemoryError");
945 goto free_body;
946 }
947 } else {
948 utfName = buf;
949 }
950 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
951 //VerifyFixClassname(utfName);
952 for (uint i = 0; i < len; i++) {
953 if (utfName[i] == '.') utfName[i] = '/';
954 }
955 } else {
956 utfName = NULL;
957 }
959 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
961 if (utfName && utfName != buf)
962 FREE_C_HEAP_ARRAY(char, utfName, mtInternal);
964 free_body:
965 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal);
966 return result;
967 }
968 }
971 UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
972 UnsafeWrapper("Unsafe_DefineClass");
973 {
974 ThreadToNativeFromVM ttnfv(thread);
975 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
976 }
977 UNSAFE_END
979 static jobject get_class_loader(JNIEnv* env, jclass cls) {
980 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
981 return NULL;
982 }
983 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
984 oop loader = k->class_loader();
985 return JNIHandles::make_local(env, loader);
986 }
988 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
989 UnsafeWrapper("Unsafe_DefineClass");
990 {
991 ThreadToNativeFromVM ttnfv(thread);
993 int depthFromDefineClass0 = 1;
994 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
995 jobject loader = (caller == NULL) ? NULL : get_class_loader(env, caller);
996 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
998 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
999 }
1000 UNSAFE_END
1003 #define DAC_Args CLS"[B["OBJ
1004 // define a class but do not make it known to the class loader or system dictionary
1005 // - host_class: supplies context for linkage, access control, protection domain, and class loader
1006 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
1007 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
1009 // When you load an anonymous class U, it works as if you changed its name just before loading,
1010 // to a name that you will never use again. Since the name is lost, no other class can directly
1011 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
1012 // through java.lang.Class methods like Class.newInstance.
1014 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
1015 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
1016 // An anonymous class also has special privileges to access any member of its host class.
1017 // This is the main reason why this loading operation is unsafe. The purpose of this is to
1018 // allow language implementations to simulate "open classes"; a host class in effect gets
1019 // new code when an anonymous class is loaded alongside it. A less convenient but more
1020 // standard way to do this is with reflection, which can also be set to ignore access
1021 // restrictions.
1023 // Access into an anonymous class is possible only through reflection. Therefore, there
1024 // are no special access rules for calling into an anonymous class. The relaxed access
1025 // rule for the host class is applied in the opposite direction: A host class reflectively
1026 // access one of its anonymous classes.
1028 // If you load the same bytecodes twice, you get two different classes. You can reload
1029 // the same bytecodes with or without varying CP patches.
1031 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
1032 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
1033 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
1035 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
1036 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
1037 // It is not possible for a named class, or an older anonymous class, to refer by
1038 // name (via its CP) to a newer anonymous class.
1040 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
1041 // or type descriptors used in the loaded anonymous class.
1043 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
1044 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
1045 // be changed to println(greeting), where greeting is an arbitrary object created before
1046 // the anonymous class is loaded. This is useful in dynamic languages, in which
1047 // various kinds of metaobjects must be introduced as constants into bytecode.
1048 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
1049 // not just a literal string. For such ldc instructions, the verifier uses the
1050 // type Object instead of String, if the loaded constant is not in fact a String.
1052 static instanceKlassHandle
1053 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
1054 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
1055 HeapWord* *temp_alloc,
1056 TRAPS) {
1058 if (UsePerfData) {
1059 ClassLoader::unsafe_defineClassCallCounter()->inc();
1060 }
1062 if (data == NULL) {
1063 THROW_0(vmSymbols::java_lang_NullPointerException());
1064 }
1066 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
1067 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
1068 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal);
1069 if (body == NULL) {
1070 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1071 }
1073 // caller responsible to free it:
1074 (*temp_alloc) = body;
1076 {
1077 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1078 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1079 }
1081 u1* class_bytes = (u1*) body;
1082 int class_bytes_length = (int) length;
1083 if (class_bytes_length < 0) class_bytes_length = 0;
1084 if (class_bytes == NULL
1085 || host_class == NULL
1086 || length != class_bytes_length)
1087 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1089 objArrayHandle cp_patches_h;
1090 if (cp_patches_jh != NULL) {
1091 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1092 if (!p->is_objArray())
1093 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1094 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1095 }
1097 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class)));
1098 const char* host_source = host_klass->external_name();
1099 Handle host_loader(THREAD, host_klass->class_loader());
1100 Handle host_domain(THREAD, host_klass->protection_domain());
1102 GrowableArray<Handle>* cp_patches = NULL;
1103 if (cp_patches_h.not_null()) {
1104 int alen = cp_patches_h->length();
1105 for (int i = alen-1; i >= 0; i--) {
1106 oop p = cp_patches_h->obj_at(i);
1107 if (p != NULL) {
1108 Handle patch(THREAD, p);
1109 if (cp_patches == NULL)
1110 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1111 cp_patches->at_put(i, patch);
1112 }
1113 }
1114 }
1116 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1118 instanceKlassHandle anon_klass;
1119 {
1120 Symbol* no_class_name = NULL;
1121 Klass* anonk = SystemDictionary::parse_stream(no_class_name,
1122 host_loader, host_domain,
1123 &st, host_klass, cp_patches,
1124 CHECK_NULL);
1125 if (anonk == NULL) return NULL;
1126 anon_klass = instanceKlassHandle(THREAD, anonk);
1127 }
1129 return anon_klass;
1130 }
1132 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1133 {
1134 instanceKlassHandle anon_klass;
1135 jobject res_jh = NULL;
1137 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1138 ResourceMark rm(THREAD);
1140 HeapWord* temp_alloc = NULL;
1142 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data,
1143 cp_patches_jh,
1144 &temp_alloc, THREAD);
1145 if (anon_klass() != NULL)
1146 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
1148 // try/finally clause:
1149 if (temp_alloc != NULL) {
1150 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal);
1151 }
1153 // The anonymous class loader data has been artificially been kept alive to
1154 // this point. The mirror and any instances of this class have to keep
1155 // it alive afterwards.
1156 if (anon_klass() != NULL) {
1157 anon_klass->class_loader_data()->set_keep_alive(false);
1158 }
1160 // let caller initialize it as needed...
1162 return (jclass) res_jh;
1163 }
1164 UNSAFE_END
1168 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1169 UnsafeWrapper("Unsafe_MonitorEnter");
1170 {
1171 if (jobj == NULL) {
1172 THROW(vmSymbols::java_lang_NullPointerException());
1173 }
1174 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1175 ObjectSynchronizer::jni_enter(obj, CHECK);
1176 }
1177 UNSAFE_END
1180 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1181 UnsafeWrapper("Unsafe_TryMonitorEnter");
1182 {
1183 if (jobj == NULL) {
1184 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1185 }
1186 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1187 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1188 return (res ? JNI_TRUE : JNI_FALSE);
1189 }
1190 UNSAFE_END
1193 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1194 UnsafeWrapper("Unsafe_MonitorExit");
1195 {
1196 if (jobj == NULL) {
1197 THROW(vmSymbols::java_lang_NullPointerException());
1198 }
1199 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1200 ObjectSynchronizer::jni_exit(obj(), CHECK);
1201 }
1202 UNSAFE_END
1205 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1206 UnsafeWrapper("Unsafe_ThrowException");
1207 {
1208 ThreadToNativeFromVM ttnfv(thread);
1209 env->Throw(thr);
1210 }
1211 UNSAFE_END
1213 // JSR166 ------------------------------------------------------------------
1215 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1216 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1217 oop x = JNIHandles::resolve(x_h);
1218 oop e = JNIHandles::resolve(e_h);
1219 oop p = JNIHandles::resolve(obj);
1220 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1221 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
1222 jboolean success = (res == e);
1223 if (success)
1224 update_barrier_set((void*)addr, x);
1225 return success;
1226 UNSAFE_END
1228 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1229 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1230 oop p = JNIHandles::resolve(obj);
1231 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1232 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1233 UNSAFE_END
1235 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1236 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1237 Handle p (THREAD, JNIHandles::resolve(obj));
1238 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1239 #ifdef SUPPORTS_NATIVE_CX8
1240 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1241 #else
1242 if (VM_Version::supports_cx8())
1243 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1244 else {
1245 jboolean success = false;
1246 MutexLockerEx mu(UnsafeJlong_lock, Mutex::_no_safepoint_check_flag);
1247 jlong val = Atomic::load(addr);
1248 if (val == e) { Atomic::store(x, addr); success = true; }
1249 return success;
1250 }
1251 #endif
1252 UNSAFE_END
1254 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1255 UnsafeWrapper("Unsafe_Park");
1256 EventThreadPark event;
1257 #ifndef USDT2
1258 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1259 #else /* USDT2 */
1260 HOTSPOT_THREAD_PARK_BEGIN(
1261 (uintptr_t) thread->parker(), (int) isAbsolute, time);
1262 #endif /* USDT2 */
1263 JavaThreadParkedState jtps(thread, time != 0);
1264 thread->parker()->park(isAbsolute != 0, time);
1265 #ifndef USDT2
1266 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1267 #else /* USDT2 */
1268 HOTSPOT_THREAD_PARK_END(
1269 (uintptr_t) thread->parker());
1270 #endif /* USDT2 */
1271 if (event.should_commit()) {
1272 oop obj = thread->current_park_blocker();
1273 event.set_klass((obj != NULL) ? obj->klass() : NULL);
1274 event.set_timeout(time);
1275 event.set_address((obj != NULL) ? (TYPE_ADDRESS) cast_from_oop<uintptr_t>(obj) : 0);
1276 event.commit();
1277 }
1278 UNSAFE_END
1280 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1281 UnsafeWrapper("Unsafe_Unpark");
1282 Parker* p = NULL;
1283 if (jthread != NULL) {
1284 oop java_thread = JNIHandles::resolve_non_null(jthread);
1285 if (java_thread != NULL) {
1286 jlong lp = java_lang_Thread::park_event(java_thread);
1287 if (lp != 0) {
1288 // This cast is OK even though the jlong might have been read
1289 // non-atomically on 32bit systems, since there, one word will
1290 // always be zero anyway and the value set is always the same
1291 p = (Parker*)addr_from_java(lp);
1292 } else {
1293 // Grab lock if apparently null or using older version of library
1294 MutexLocker mu(Threads_lock);
1295 java_thread = JNIHandles::resolve_non_null(jthread);
1296 if (java_thread != NULL) {
1297 JavaThread* thr = java_lang_Thread::thread(java_thread);
1298 if (thr != NULL) {
1299 p = thr->parker();
1300 if (p != NULL) { // Bind to Java thread for next time.
1301 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1302 }
1303 }
1304 }
1305 }
1306 }
1307 }
1308 if (p != NULL) {
1309 #ifndef USDT2
1310 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1311 #else /* USDT2 */
1312 HOTSPOT_THREAD_UNPARK(
1313 (uintptr_t) p);
1314 #endif /* USDT2 */
1315 p->unpark();
1316 }
1317 UNSAFE_END
1319 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1320 UnsafeWrapper("Unsafe_Loadavg");
1321 const int max_nelem = 3;
1322 double la[max_nelem];
1323 jint ret;
1325 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1326 assert(a->is_typeArray(), "must be type array");
1328 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1329 ThreadToNativeFromVM ttnfv(thread);
1330 throw_new(env, "ArrayIndexOutOfBoundsException");
1331 return -1;
1332 }
1334 ret = os::loadavg(la, nelem);
1335 if (ret == -1) return -1;
1337 // if successful, ret is the number of samples actually retrieved.
1338 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1339 switch(ret) {
1340 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1341 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1342 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1343 }
1344 return ret;
1345 UNSAFE_END
1347 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1348 UnsafeWrapper("Unsafe_PrefetchRead");
1349 oop p = JNIHandles::resolve(obj);
1350 void* addr = index_oop_from_field_offset_long(p, 0);
1351 Prefetch::read(addr, (intx)offset);
1352 UNSAFE_END
1354 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1355 UnsafeWrapper("Unsafe_PrefetchWrite");
1356 oop p = JNIHandles::resolve(obj);
1357 void* addr = index_oop_from_field_offset_long(p, 0);
1358 Prefetch::write(addr, (intx)offset);
1359 UNSAFE_END
1362 /// JVM_RegisterUnsafeMethods
1364 #define ADR "J"
1366 #define LANG "Ljava/lang/"
1368 #define OBJ LANG"Object;"
1369 #define CLS LANG"Class;"
1370 #define CTR LANG"reflect/Constructor;"
1371 #define FLD LANG"reflect/Field;"
1372 #define MTH LANG"reflect/Method;"
1373 #define THR LANG"Throwable;"
1375 #define DC0_Args LANG"String;[BII"
1376 #define DC_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1378 #define CC (char*) /*cast a literal from (const char*)*/
1379 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1381 // define deprecated accessors for compabitility with 1.4.0
1382 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1383 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1384 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1386 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1387 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1388 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1389 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1391 // Note: In 1.5.0, there are volatile versions too
1392 #define DECLARE_GETSETOOP(Boolean, Z) \
1393 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1394 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1395 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1396 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1399 #define DECLARE_GETSETNATIVE(Byte, B) \
1400 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1401 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1405 // These are the methods for 1.4.0
1406 static JNINativeMethod methods_140[] = {
1407 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)},
1408 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)},
1410 DECLARE_GETSETOOP_140(Boolean, Z),
1411 DECLARE_GETSETOOP_140(Byte, B),
1412 DECLARE_GETSETOOP_140(Short, S),
1413 DECLARE_GETSETOOP_140(Char, C),
1414 DECLARE_GETSETOOP_140(Int, I),
1415 DECLARE_GETSETOOP_140(Long, J),
1416 DECLARE_GETSETOOP_140(Float, F),
1417 DECLARE_GETSETOOP_140(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"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)},
1435 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)},
1436 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1437 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1438 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1439 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1440 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1442 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1443 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1444 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1445 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1446 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1447 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1448 };
1450 // These are the methods prior to the JSR 166 changes in 1.5.0
1451 static JNINativeMethod methods_141[] = {
1452 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1453 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1455 DECLARE_GETSETOOP_141(Boolean, Z),
1456 DECLARE_GETSETOOP_141(Byte, B),
1457 DECLARE_GETSETOOP_141(Short, S),
1458 DECLARE_GETSETOOP_141(Char, C),
1459 DECLARE_GETSETOOP_141(Int, I),
1460 DECLARE_GETSETOOP_141(Long, J),
1461 DECLARE_GETSETOOP_141(Float, F),
1462 DECLARE_GETSETOOP_141(Double, D),
1464 DECLARE_GETSETNATIVE(Byte, B),
1465 DECLARE_GETSETNATIVE(Short, S),
1466 DECLARE_GETSETNATIVE(Char, C),
1467 DECLARE_GETSETNATIVE(Int, I),
1468 DECLARE_GETSETNATIVE(Long, J),
1469 DECLARE_GETSETNATIVE(Float, F),
1470 DECLARE_GETSETNATIVE(Double, D),
1472 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1473 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1475 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1476 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1477 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1479 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1480 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1481 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1482 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1483 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1484 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1485 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1486 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1488 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1489 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1490 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1491 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1492 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1493 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1495 };
1497 // These are the methods prior to the JSR 166 changes in 1.6.0
1498 static JNINativeMethod methods_15[] = {
1499 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1500 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1501 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1502 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1505 DECLARE_GETSETOOP(Boolean, Z),
1506 DECLARE_GETSETOOP(Byte, B),
1507 DECLARE_GETSETOOP(Short, S),
1508 DECLARE_GETSETOOP(Char, C),
1509 DECLARE_GETSETOOP(Int, I),
1510 DECLARE_GETSETOOP(Long, J),
1511 DECLARE_GETSETOOP(Float, F),
1512 DECLARE_GETSETOOP(Double, D),
1514 DECLARE_GETSETNATIVE(Byte, B),
1515 DECLARE_GETSETNATIVE(Short, S),
1516 DECLARE_GETSETNATIVE(Char, C),
1517 DECLARE_GETSETNATIVE(Int, I),
1518 DECLARE_GETSETNATIVE(Long, J),
1519 DECLARE_GETSETNATIVE(Float, F),
1520 DECLARE_GETSETNATIVE(Double, D),
1522 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1523 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1525 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1526 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1527 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1529 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1530 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1531 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1532 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1533 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1534 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1535 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1536 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1538 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1539 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1540 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1541 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1542 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
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"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1548 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1550 };
1552 // These are the methods for 1.6.0 and 1.7.0
1553 static JNINativeMethod methods_16[] = {
1554 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1555 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1556 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1557 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1559 DECLARE_GETSETOOP(Boolean, Z),
1560 DECLARE_GETSETOOP(Byte, B),
1561 DECLARE_GETSETOOP(Short, S),
1562 DECLARE_GETSETOOP(Char, C),
1563 DECLARE_GETSETOOP(Int, I),
1564 DECLARE_GETSETOOP(Long, J),
1565 DECLARE_GETSETOOP(Float, F),
1566 DECLARE_GETSETOOP(Double, D),
1568 DECLARE_GETSETNATIVE(Byte, B),
1569 DECLARE_GETSETNATIVE(Short, S),
1570 DECLARE_GETSETNATIVE(Char, C),
1571 DECLARE_GETSETNATIVE(Int, I),
1572 DECLARE_GETSETNATIVE(Long, J),
1573 DECLARE_GETSETNATIVE(Float, F),
1574 DECLARE_GETSETNATIVE(Double, D),
1576 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1577 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1579 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1580 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1581 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1583 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1584 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1585 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1586 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1587 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1588 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1589 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1590 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1592 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1593 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1594 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1595 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1596 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1597 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1598 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1599 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1600 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1601 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1602 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1603 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1604 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1605 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1606 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1607 };
1609 // These are the methods for 1.8.0
1610 static JNINativeMethod methods_18[] = {
1611 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1612 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1613 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1614 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1616 DECLARE_GETSETOOP(Boolean, Z),
1617 DECLARE_GETSETOOP(Byte, B),
1618 DECLARE_GETSETOOP(Short, S),
1619 DECLARE_GETSETOOP(Char, C),
1620 DECLARE_GETSETOOP(Int, I),
1621 DECLARE_GETSETOOP(Long, J),
1622 DECLARE_GETSETOOP(Float, F),
1623 DECLARE_GETSETOOP(Double, D),
1625 DECLARE_GETSETNATIVE(Byte, B),
1626 DECLARE_GETSETNATIVE(Short, S),
1627 DECLARE_GETSETNATIVE(Char, C),
1628 DECLARE_GETSETNATIVE(Int, I),
1629 DECLARE_GETSETNATIVE(Long, J),
1630 DECLARE_GETSETNATIVE(Float, F),
1631 DECLARE_GETSETNATIVE(Double, D),
1633 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1634 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1636 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1637 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1638 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1640 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1641 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1642 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1643 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1644 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1645 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1646 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1647 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1649 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)},
1650 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1651 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1652 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1653 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1654 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1655 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1656 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1657 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1658 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1659 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1660 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1661 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1662 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1663 };
1665 JNINativeMethod loadavg_method[] = {
1666 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1667 };
1669 JNINativeMethod prefetch_methods[] = {
1670 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1671 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1672 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1673 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1674 };
1676 JNINativeMethod memcopy_methods_17[] = {
1677 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1678 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1679 };
1681 JNINativeMethod memcopy_methods_15[] = {
1682 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1683 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1684 };
1686 JNINativeMethod anonk_methods[] = {
1687 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1688 };
1690 JNINativeMethod lform_methods[] = {
1691 {CC"shouldBeInitialized",CC"("CLS")Z", FN_PTR(Unsafe_ShouldBeInitialized)},
1692 };
1694 JNINativeMethod fence_methods[] = {
1695 {CC"loadFence", CC"()V", FN_PTR(Unsafe_LoadFence)},
1696 {CC"storeFence", CC"()V", FN_PTR(Unsafe_StoreFence)},
1697 {CC"fullFence", CC"()V", FN_PTR(Unsafe_FullFence)},
1698 };
1700 #undef CC
1701 #undef FN_PTR
1703 #undef ADR
1704 #undef LANG
1705 #undef OBJ
1706 #undef CLS
1707 #undef CTR
1708 #undef FLD
1709 #undef MTH
1710 #undef THR
1711 #undef DC0_Args
1712 #undef DC_Args
1714 #undef DECLARE_GETSETOOP
1715 #undef DECLARE_GETSETNATIVE
1718 /**
1719 * Helper method to register native methods.
1720 */
1721 static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1722 int status = env->RegisterNatives(clazz, methods, nMethods);
1723 if (status < 0 || env->ExceptionOccurred()) {
1724 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1725 tty->print_cr("Unsafe: failed registering %s", message);
1726 }
1727 env->ExceptionClear();
1728 return false;
1729 } else {
1730 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1731 tty->print_cr("Unsafe: successfully registered %s", message);
1732 }
1733 return true;
1734 }
1735 }
1738 // This one function is exported, used by NativeLookup.
1739 // The Unsafe_xxx functions above are called only from the interpreter.
1740 // The optimizer looks at names and signatures to recognize
1741 // individual functions.
1743 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1744 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1745 {
1746 ThreadToNativeFromVM ttnfv(thread);
1748 // Unsafe methods
1749 {
1750 bool success = false;
1751 // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6
1752 if (!success) {
1753 success = register_natives("1.6 methods", env, unsafecls, methods_16, sizeof(methods_16)/sizeof(JNINativeMethod));
1754 }
1755 if (!success) {
1756 success = register_natives("1.8 methods", env, unsafecls, methods_18, sizeof(methods_18)/sizeof(JNINativeMethod));
1757 }
1758 if (!success) {
1759 success = register_natives("1.5 methods", env, unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1760 }
1761 if (!success) {
1762 success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1763 }
1764 if (!success) {
1765 success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1766 }
1767 guarantee(success, "register unsafe natives");
1768 }
1770 // Unsafe.getLoadAverage
1771 register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1773 // Prefetch methods
1774 register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1776 // Memory copy methods
1777 {
1778 bool success = false;
1779 if (!success) {
1780 success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod));
1781 }
1782 if (!success) {
1783 success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1784 }
1785 }
1787 // Unsafe.defineAnonymousClass
1788 if (EnableInvokeDynamic) {
1789 register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1790 }
1792 // Unsafe.shouldBeInitialized
1793 if (EnableInvokeDynamic) {
1794 register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod));
1795 }
1797 // Fence methods
1798 register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod));
1799 }
1800 JVM_END
