Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/prims/unsafe.cpp@edd76a5856f7
src/share/vm/prims/unsafe.cpp
Thu, 24 Jan 2013 22:13:32 -0800
- author
- sspitsyn
- date
- Thu, 24 Jan 2013 22:13:32 -0800
- changeset 4493
- edd76a5856f7
- parent 4361
- 1e41b0bc58a0
- child 4542
- db9981fd3124
- permissions
- -rw-r--r--
8005128: JSR 292: the mlvm redefineClassInBootstrap test crashes in ConstantPool::compare_entry_to
Summary: When constant pool is copied in merge_constant_pools the invokedynamic operands must be copied before.
Reviewed-by: coleenp, twisti
Contributed-by: serguei.spitsyn@oracle.com
1 /*
2 * Copyright (c) 2000, 2012, 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 #ifndef SERIALGC
28 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
29 #endif // SERIALGC
30 #include "memory/allocation.inline.hpp"
31 #include "prims/jni.h"
32 #include "prims/jvm.h"
33 #include "runtime/globals.hpp"
34 #include "runtime/interfaceSupport.hpp"
35 #include "runtime/reflection.hpp"
36 #include "runtime/synchronizer.hpp"
37 #include "services/threadService.hpp"
38 #include "utilities/copy.hpp"
39 #include "utilities/dtrace.hpp"
41 /*
42 * Implementation of class sun.misc.Unsafe
43 */
45 #ifndef USDT2
46 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long);
47 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t);
48 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t);
49 #endif /* !USDT2 */
51 #define MAX_OBJECT_SIZE \
52 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
53 + ((julong)max_jint * sizeof(double)) )
56 #define UNSAFE_ENTRY(result_type, header) \
57 JVM_ENTRY(result_type, header)
59 // Can't use UNSAFE_LEAF because it has the signature of a straight
60 // call into the runtime (just like JVM_LEAF, funny that) but it's
61 // called like a Java Native and thus the wrapper built for it passes
62 // arguments like a JNI call. It expects those arguments to be popped
63 // from the stack on Intel like all good JNI args are, and adjusts the
64 // stack according. Since the JVM_LEAF call expects no extra
65 // arguments the stack isn't popped in the C code, is pushed by the
66 // wrapper and we get sick.
67 //#define UNSAFE_LEAF(result_type, header) \
68 // JVM_LEAF(result_type, header)
70 #define UNSAFE_END JVM_END
72 #define UnsafeWrapper(arg) /*nothing, for the present*/
75 inline void* addr_from_java(jlong addr) {
76 // This assert fails in a variety of ways on 32-bit systems.
77 // It is impossible to predict whether native code that converts
78 // pointers to longs will sign-extend or zero-extend the addresses.
79 //assert(addr == (uintptr_t)addr, "must not be odd high bits");
80 return (void*)(uintptr_t)addr;
81 }
83 inline jlong addr_to_java(void* p) {
84 assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
85 return (uintptr_t)p;
86 }
89 // Note: The VM's obj_field and related accessors use byte-scaled
90 // ("unscaled") offsets, just as the unsafe methods do.
92 // However, the method Unsafe.fieldOffset explicitly declines to
93 // guarantee this. The field offset values manipulated by the Java user
94 // through the Unsafe API are opaque cookies that just happen to be byte
95 // offsets. We represent this state of affairs by passing the cookies
96 // through conversion functions when going between the VM and the Unsafe API.
97 // The conversion functions just happen to be no-ops at present.
99 inline jlong field_offset_to_byte_offset(jlong field_offset) {
100 return field_offset;
101 }
103 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
104 return byte_offset;
105 }
107 inline jint invocation_key_from_method_slot(jint slot) {
108 return slot;
109 }
111 inline jint invocation_key_to_method_slot(jint key) {
112 return key;
113 }
115 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
116 jlong byte_offset = field_offset_to_byte_offset(field_offset);
117 // Don't allow unsafe to be used to read or write the header word of oops
118 assert(p == NULL || field_offset >= oopDesc::header_size(), "offset must be outside of header");
119 #ifdef ASSERT
120 if (p != NULL) {
121 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
122 if (byte_offset == (jint)byte_offset) {
123 void* ptr_plus_disp = (address)p + byte_offset;
124 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
125 "raw [ptr+disp] must be consistent with oop::field_base");
126 }
127 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 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
167 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
168 oop p = JNIHandles::resolve(obj); \
169 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x);
171 // Macros for oops that check UseCompressedOops
173 #define GET_OOP_FIELD(obj, offset, v) \
174 oop p = JNIHandles::resolve(obj); \
175 oop v; \
176 if (UseCompressedOops) { \
177 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
178 v = oopDesc::decode_heap_oop(n); \
179 } else { \
180 v = *(oop*)index_oop_from_field_offset_long(p, offset); \
181 }
184 // Get/SetObject must be special-cased, since it works with handles.
186 // The xxx140 variants for backward compatibility do not allow a full-width offset.
187 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
188 UnsafeWrapper("Unsafe_GetObject");
189 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
190 GET_OOP_FIELD(obj, offset, v)
191 jobject ret = JNIHandles::make_local(env, v);
192 #ifndef SERIALGC
193 // We could be accessing the referent field in a reference
194 // object. If G1 is enabled then we need to register a non-null
195 // referent with the SATB barrier.
196 if (UseG1GC) {
197 bool needs_barrier = false;
199 if (ret != NULL) {
200 if (offset == java_lang_ref_Reference::referent_offset) {
201 oop o = JNIHandles::resolve_non_null(obj);
202 Klass* k = o->klass();
203 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
204 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
205 needs_barrier = true;
206 }
207 }
208 }
210 if (needs_barrier) {
211 oop referent = JNIHandles::resolve(ret);
212 G1SATBCardTableModRefBS::enqueue(referent);
213 }
214 }
215 #endif // SERIALGC
216 return ret;
217 UNSAFE_END
219 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
220 UnsafeWrapper("Unsafe_SetObject");
221 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
222 oop x = JNIHandles::resolve(x_h);
223 //SET_FIELD(obj, offset, oop, x);
224 oop p = JNIHandles::resolve(obj);
225 if (UseCompressedOops) {
226 if (x != NULL) {
227 // If there is a heap base pointer, we are obliged to emit a store barrier.
228 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
229 } else {
230 narrowOop n = oopDesc::encode_heap_oop_not_null(x);
231 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
232 }
233 } else {
234 if (x != NULL) {
235 // If there is a heap base pointer, we are obliged to emit a store barrier.
236 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
237 } else {
238 *(oop*)index_oop_from_field_offset_long(p, offset) = x;
239 }
240 }
241 UNSAFE_END
243 // The normal variants allow a null base pointer with an arbitrary address.
244 // But if the base pointer is non-null, the offset should make some sense.
245 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
246 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
247 UnsafeWrapper("Unsafe_GetObject");
248 GET_OOP_FIELD(obj, offset, v)
249 jobject ret = JNIHandles::make_local(env, v);
250 #ifndef SERIALGC
251 // We could be accessing the referent field in a reference
252 // object. If G1 is enabled then we need to register non-null
253 // referent with the SATB barrier.
254 if (UseG1GC) {
255 bool needs_barrier = false;
257 if (ret != NULL) {
258 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) {
259 oop o = JNIHandles::resolve(obj);
260 Klass* k = o->klass();
261 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
262 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
263 needs_barrier = true;
264 }
265 }
266 }
268 if (needs_barrier) {
269 oop referent = JNIHandles::resolve(ret);
270 G1SATBCardTableModRefBS::enqueue(referent);
271 }
272 }
273 #endif // SERIALGC
274 return ret;
275 UNSAFE_END
277 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
278 UnsafeWrapper("Unsafe_SetObject");
279 oop x = JNIHandles::resolve(x_h);
280 oop p = JNIHandles::resolve(obj);
281 if (UseCompressedOops) {
282 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
283 } else {
284 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
285 }
286 UNSAFE_END
288 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
289 UnsafeWrapper("Unsafe_GetObjectVolatile");
290 oop p = JNIHandles::resolve(obj);
291 void* addr = index_oop_from_field_offset_long(p, offset);
292 volatile oop v;
293 if (UseCompressedOops) {
294 volatile narrowOop n = *(volatile narrowOop*) addr;
295 v = oopDesc::decode_heap_oop(n);
296 } else {
297 v = *(volatile oop*) addr;
298 }
299 OrderAccess::acquire();
300 return JNIHandles::make_local(env, v);
301 UNSAFE_END
303 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
304 UnsafeWrapper("Unsafe_SetObjectVolatile");
305 oop x = JNIHandles::resolve(x_h);
306 oop p = JNIHandles::resolve(obj);
307 void* addr = index_oop_from_field_offset_long(p, offset);
308 OrderAccess::release();
309 if (UseCompressedOops) {
310 oop_store((narrowOop*)addr, x);
311 } else {
312 oop_store((oop*)addr, x);
313 }
314 OrderAccess::fence();
315 UNSAFE_END
317 #if defined(SPARC) || defined(X86)
318 // Sparc and X86 have atomic jlong (8 bytes) instructions
320 #else
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 SPARC and not X86
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 #if defined(SPARC) || defined(X86)
423 // Sparc and X86 have atomic jlong (8 bytes) instructions
424 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
425 #endif
427 #undef DEFINE_GETSETOOP_VOLATILE
429 // The non-intrinsified versions of setOrdered just use setVolatile
431 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
432 UnsafeWrapper("Unsafe_SetOrderedInt");
433 SET_FIELD_VOLATILE(obj, offset, jint, x);
434 UNSAFE_END
436 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
437 UnsafeWrapper("Unsafe_SetOrderedObject");
438 oop x = JNIHandles::resolve(x_h);
439 oop p = JNIHandles::resolve(obj);
440 void* addr = index_oop_from_field_offset_long(p, offset);
441 OrderAccess::release();
442 if (UseCompressedOops) {
443 oop_store((narrowOop*)addr, x);
444 } else {
445 oop_store((oop*)addr, x);
446 }
447 OrderAccess::fence();
448 UNSAFE_END
450 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
451 UnsafeWrapper("Unsafe_SetOrderedLong");
452 #if defined(SPARC) || defined(X86)
453 // Sparc and X86 have atomic jlong (8 bytes) instructions
454 SET_FIELD_VOLATILE(obj, offset, jlong, x);
455 #else
456 // Keep old code for platforms which may not have atomic long (8 bytes) instructions
457 {
458 if (VM_Version::supports_cx8()) {
459 SET_FIELD_VOLATILE(obj, offset, jlong, x);
460 }
461 else {
462 Handle p (THREAD, JNIHandles::resolve(obj));
463 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
464 ObjectLocker ol(p, THREAD);
465 *addr = x;
466 }
467 }
468 #endif
469 UNSAFE_END
471 UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe))
472 UnsafeWrapper("Unsafe_LoadFence");
473 OrderAccess::acquire();
474 UNSAFE_END
476 UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe))
477 UnsafeWrapper("Unsafe_StoreFence");
478 OrderAccess::release();
479 UNSAFE_END
481 UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe))
482 UnsafeWrapper("Unsafe_FullFence");
483 OrderAccess::fence();
484 UNSAFE_END
486 ////// Data in the C heap.
488 // Note: These do not throw NullPointerException for bad pointers.
489 // They just crash. Only a oop base pointer can generate a NullPointerException.
490 //
491 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
492 \
493 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
494 UnsafeWrapper("Unsafe_GetNative"#Type); \
495 void* p = addr_from_java(addr); \
496 JavaThread* t = JavaThread::current(); \
497 t->set_doing_unsafe_access(true); \
498 java_type x = *(volatile native_type*)p; \
499 t->set_doing_unsafe_access(false); \
500 return x; \
501 UNSAFE_END \
502 \
503 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
504 UnsafeWrapper("Unsafe_SetNative"#Type); \
505 JavaThread* t = JavaThread::current(); \
506 t->set_doing_unsafe_access(true); \
507 void* p = addr_from_java(addr); \
508 *(volatile native_type*)p = x; \
509 t->set_doing_unsafe_access(false); \
510 UNSAFE_END \
511 \
512 // END DEFINE_GETSETNATIVE.
514 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
515 DEFINE_GETSETNATIVE(jshort, Short, signed short);
516 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
517 DEFINE_GETSETNATIVE(jint, Int, jint);
518 // no long -- handled specially
519 DEFINE_GETSETNATIVE(jfloat, Float, float);
520 DEFINE_GETSETNATIVE(jdouble, Double, double);
522 #undef DEFINE_GETSETNATIVE
524 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
525 UnsafeWrapper("Unsafe_GetNativeLong");
526 JavaThread* t = JavaThread::current();
527 // We do it this way to avoid problems with access to heap using 64
528 // bit loads, as jlong in heap could be not 64-bit aligned, and on
529 // some CPUs (SPARC) it leads to SIGBUS.
530 t->set_doing_unsafe_access(true);
531 void* p = addr_from_java(addr);
532 jlong x;
533 if (((intptr_t)p & 7) == 0) {
534 // jlong is aligned, do a volatile access
535 x = *(volatile jlong*)p;
536 } else {
537 jlong_accessor acc;
538 acc.words[0] = ((volatile jint*)p)[0];
539 acc.words[1] = ((volatile jint*)p)[1];
540 x = acc.long_value;
541 }
542 t->set_doing_unsafe_access(false);
543 return x;
544 UNSAFE_END
546 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
547 UnsafeWrapper("Unsafe_SetNativeLong");
548 JavaThread* t = JavaThread::current();
549 // see comment for Unsafe_GetNativeLong
550 t->set_doing_unsafe_access(true);
551 void* p = addr_from_java(addr);
552 if (((intptr_t)p & 7) == 0) {
553 // jlong is aligned, do a volatile access
554 *(volatile jlong*)p = x;
555 } else {
556 jlong_accessor acc;
557 acc.long_value = x;
558 ((volatile jint*)p)[0] = acc.words[0];
559 ((volatile jint*)p)[1] = acc.words[1];
560 }
561 t->set_doing_unsafe_access(false);
562 UNSAFE_END
565 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
566 UnsafeWrapper("Unsafe_GetNativeAddress");
567 void* p = addr_from_java(addr);
568 return addr_to_java(*(void**)p);
569 UNSAFE_END
571 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
572 UnsafeWrapper("Unsafe_SetNativeAddress");
573 void* p = addr_from_java(addr);
574 *(void**)p = addr_from_java(x);
575 UNSAFE_END
578 ////// Allocation requests
580 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
581 UnsafeWrapper("Unsafe_AllocateInstance");
582 {
583 ThreadToNativeFromVM ttnfv(thread);
584 return env->AllocObject(cls);
585 }
586 UNSAFE_END
588 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
589 UnsafeWrapper("Unsafe_AllocateMemory");
590 size_t sz = (size_t)size;
591 if (sz != (julong)size || size < 0) {
592 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
593 }
594 if (sz == 0) {
595 return 0;
596 }
597 sz = round_to(sz, HeapWordSize);
598 void* x = os::malloc(sz, mtInternal);
599 if (x == NULL) {
600 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
601 }
602 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
603 return addr_to_java(x);
604 UNSAFE_END
606 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
607 UnsafeWrapper("Unsafe_ReallocateMemory");
608 void* p = addr_from_java(addr);
609 size_t sz = (size_t)size;
610 if (sz != (julong)size || size < 0) {
611 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
612 }
613 if (sz == 0) {
614 os::free(p);
615 return 0;
616 }
617 sz = round_to(sz, HeapWordSize);
618 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal);
619 if (x == NULL) {
620 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
621 }
622 return addr_to_java(x);
623 UNSAFE_END
625 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
626 UnsafeWrapper("Unsafe_FreeMemory");
627 void* p = addr_from_java(addr);
628 if (p == NULL) {
629 return;
630 }
631 os::free(p);
632 UNSAFE_END
634 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
635 UnsafeWrapper("Unsafe_SetMemory");
636 size_t sz = (size_t)size;
637 if (sz != (julong)size || size < 0) {
638 THROW(vmSymbols::java_lang_IllegalArgumentException());
639 }
640 char* p = (char*) addr_from_java(addr);
641 Copy::fill_to_memory_atomic(p, sz, value);
642 UNSAFE_END
644 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
645 UnsafeWrapper("Unsafe_SetMemory");
646 size_t sz = (size_t)size;
647 if (sz != (julong)size || size < 0) {
648 THROW(vmSymbols::java_lang_IllegalArgumentException());
649 }
650 oop base = JNIHandles::resolve(obj);
651 void* p = index_oop_from_field_offset_long(base, offset);
652 Copy::fill_to_memory_atomic(p, sz, value);
653 UNSAFE_END
655 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
656 UnsafeWrapper("Unsafe_CopyMemory");
657 if (size == 0) {
658 return;
659 }
660 size_t sz = (size_t)size;
661 if (sz != (julong)size || size < 0) {
662 THROW(vmSymbols::java_lang_IllegalArgumentException());
663 }
664 void* src = addr_from_java(srcAddr);
665 void* dst = addr_from_java(dstAddr);
666 Copy::conjoint_memory_atomic(src, dst, sz);
667 UNSAFE_END
669 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
670 UnsafeWrapper("Unsafe_CopyMemory");
671 if (size == 0) {
672 return;
673 }
674 size_t sz = (size_t)size;
675 if (sz != (julong)size || size < 0) {
676 THROW(vmSymbols::java_lang_IllegalArgumentException());
677 }
678 oop srcp = JNIHandles::resolve(srcObj);
679 oop dstp = JNIHandles::resolve(dstObj);
680 if (dstp != NULL && !dstp->is_typeArray()) {
681 // NYI: This works only for non-oop arrays at present.
682 // Generalizing it would be reasonable, but requires card marking.
683 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
684 THROW(vmSymbols::java_lang_IllegalArgumentException());
685 }
686 void* src = index_oop_from_field_offset_long(srcp, srcOffset);
687 void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
688 Copy::conjoint_memory_atomic(src, dst, sz);
689 UNSAFE_END
692 ////// Random queries
694 // See comment at file start about UNSAFE_LEAF
695 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
696 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
697 UnsafeWrapper("Unsafe_AddressSize");
698 return sizeof(void*);
699 UNSAFE_END
701 // See comment at file start about UNSAFE_LEAF
702 //UNSAFE_LEAF(jint, Unsafe_PageSize())
703 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
704 UnsafeWrapper("Unsafe_PageSize");
705 return os::vm_page_size();
706 UNSAFE_END
708 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
709 if (field == NULL) {
710 THROW_0(vmSymbols::java_lang_NullPointerException());
711 }
713 oop reflected = JNIHandles::resolve_non_null(field);
714 oop mirror = java_lang_reflect_Field::clazz(reflected);
715 Klass* k = java_lang_Class::as_Klass(mirror);
716 int slot = java_lang_reflect_Field::slot(reflected);
717 int modifiers = java_lang_reflect_Field::modifiers(reflected);
719 if (must_be_static >= 0) {
720 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
721 if (must_be_static != really_is_static) {
722 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
723 }
724 }
726 int offset = InstanceKlass::cast(k)->field_offset(slot);
727 return field_offset_from_byte_offset(offset);
728 }
730 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
731 UnsafeWrapper("Unsafe_ObjectFieldOffset");
732 return find_field_offset(field, 0, THREAD);
733 UNSAFE_END
735 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
736 UnsafeWrapper("Unsafe_StaticFieldOffset");
737 return find_field_offset(field, 1, THREAD);
738 UNSAFE_END
740 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
741 UnsafeWrapper("Unsafe_StaticFieldBase");
742 // Note: In this VM implementation, a field address is always a short
743 // offset from the base of a a klass metaobject. Thus, the full dynamic
744 // range of the return type is never used. However, some implementations
745 // might put the static field inside an array shared by many classes,
746 // or even at a fixed address, in which case the address could be quite
747 // large. In that last case, this function would return NULL, since
748 // the address would operate alone, without any base pointer.
750 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
752 oop reflected = JNIHandles::resolve_non_null(field);
753 oop mirror = java_lang_reflect_Field::clazz(reflected);
754 int modifiers = java_lang_reflect_Field::modifiers(reflected);
756 if ((modifiers & JVM_ACC_STATIC) == 0) {
757 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
758 }
760 return JNIHandles::make_local(env, mirror);
761 UNSAFE_END
763 //@deprecated
764 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
765 UnsafeWrapper("Unsafe_FieldOffset");
766 // tries (but fails) to be polymorphic between static and non-static:
767 jlong offset = find_field_offset(field, -1, THREAD);
768 guarantee(offset == (jint)offset, "offset fits in 32 bits");
769 return (jint)offset;
770 UNSAFE_END
772 //@deprecated
773 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
774 UnsafeWrapper("Unsafe_StaticFieldBase");
775 if (clazz == NULL) {
776 THROW_0(vmSymbols::java_lang_NullPointerException());
777 }
778 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
779 UNSAFE_END
781 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
782 UnsafeWrapper("Unsafe_EnsureClassInitialized");
783 if (clazz == NULL) {
784 THROW(vmSymbols::java_lang_NullPointerException());
785 }
786 oop mirror = JNIHandles::resolve_non_null(clazz);
788 Klass* klass = java_lang_Class::as_Klass(mirror);
789 if (klass != NULL && klass->should_be_initialized()) {
790 InstanceKlass* k = InstanceKlass::cast(klass);
791 k->initialize(CHECK);
792 }
793 }
794 UNSAFE_END
796 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
797 UnsafeWrapper("Unsafe_ShouldBeInitialized");
798 if (clazz == NULL) {
799 THROW_(vmSymbols::java_lang_NullPointerException(), false);
800 }
801 oop mirror = JNIHandles::resolve_non_null(clazz);
802 Klass* klass = java_lang_Class::as_Klass(mirror);
803 if (klass != NULL && klass->should_be_initialized()) {
804 return true;
805 }
806 return false;
807 }
808 UNSAFE_END
810 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
811 if (acls == NULL) {
812 THROW(vmSymbols::java_lang_NullPointerException());
813 }
814 oop mirror = JNIHandles::resolve_non_null(acls);
815 Klass* k = java_lang_Class::as_Klass(mirror);
816 if (k == NULL || !k->oop_is_array()) {
817 THROW(vmSymbols::java_lang_InvalidClassException());
818 } else if (k->oop_is_objArray()) {
819 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
820 scale = heapOopSize;
821 } else if (k->oop_is_typeArray()) {
822 TypeArrayKlass* tak = TypeArrayKlass::cast(k);
823 base = tak->array_header_in_bytes();
824 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
825 scale = (1 << tak->log2_element_size());
826 } else {
827 ShouldNotReachHere();
828 }
829 }
831 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
832 UnsafeWrapper("Unsafe_ArrayBaseOffset");
833 int base, scale;
834 getBaseAndScale(base, scale, acls, CHECK_0);
835 return field_offset_from_byte_offset(base);
836 UNSAFE_END
839 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
840 UnsafeWrapper("Unsafe_ArrayIndexScale");
841 int base, scale;
842 getBaseAndScale(base, scale, acls, CHECK_0);
843 // This VM packs both fields and array elements down to the byte.
844 // But watch out: If this changes, so that array references for
845 // a given primitive type (say, T_BOOLEAN) use different memory units
846 // than fields, this method MUST return zero for such arrays.
847 // For example, the VM used to store sub-word sized fields in full
848 // words in the object layout, so that accessors like getByte(Object,int)
849 // did not really do what one might expect for arrays. Therefore,
850 // this function used to report a zero scale factor, so that the user
851 // would know not to attempt to access sub-word array elements.
852 // // Code for unpacked fields:
853 // if (scale < wordSize) return 0;
855 // The following allows for a pretty general fieldOffset cookie scheme,
856 // but requires it to be linear in byte offset.
857 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
858 UNSAFE_END
861 static inline void throw_new(JNIEnv *env, const char *ename) {
862 char buf[100];
863 strcpy(buf, "java/lang/");
864 strcat(buf, ename);
865 jclass cls = env->FindClass(buf);
866 char* msg = NULL;
867 env->ThrowNew(cls, msg);
868 }
870 static jclass Unsafe_DefineClass(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
871 {
872 // Code lifted from JDK 1.3 ClassLoader.c
874 jbyte *body;
875 char *utfName;
876 jclass result = 0;
877 char buf[128];
879 if (UsePerfData) {
880 ClassLoader::unsafe_defineClassCallCounter()->inc();
881 }
883 if (data == NULL) {
884 throw_new(env, "NullPointerException");
885 return 0;
886 }
888 /* Work around 4153825. malloc crashes on Solaris when passed a
889 * negative size.
890 */
891 if (length < 0) {
892 throw_new(env, "ArrayIndexOutOfBoundsException");
893 return 0;
894 }
896 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
898 if (body == 0) {
899 throw_new(env, "OutOfMemoryError");
900 return 0;
901 }
903 env->GetByteArrayRegion(data, offset, length, body);
905 if (env->ExceptionOccurred())
906 goto free_body;
908 if (name != NULL) {
909 uint len = env->GetStringUTFLength(name);
910 int unicode_len = env->GetStringLength(name);
911 if (len >= sizeof(buf)) {
912 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
913 if (utfName == NULL) {
914 throw_new(env, "OutOfMemoryError");
915 goto free_body;
916 }
917 } else {
918 utfName = buf;
919 }
920 env->GetStringUTFRegion(name, 0, unicode_len, utfName);
921 //VerifyFixClassname(utfName);
922 for (uint i = 0; i < len; i++) {
923 if (utfName[i] == '.') utfName[i] = '/';
924 }
925 } else {
926 utfName = NULL;
927 }
929 result = JVM_DefineClass(env, utfName, loader, body, length, pd);
931 if (utfName && utfName != buf)
932 FREE_C_HEAP_ARRAY(char, utfName, mtInternal);
934 free_body:
935 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal);
936 return result;
937 }
938 }
941 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
942 UnsafeWrapper("Unsafe_DefineClass");
943 {
944 ThreadToNativeFromVM ttnfv(thread);
946 int depthFromDefineClass0 = 1;
947 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
948 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
949 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
951 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
952 }
953 UNSAFE_END
956 UNSAFE_ENTRY(jclass, Unsafe_DefineClass1(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
957 UnsafeWrapper("Unsafe_DefineClass");
958 {
959 ThreadToNativeFromVM ttnfv(thread);
961 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
962 }
963 UNSAFE_END
965 #define DAC_Args CLS"[B["OBJ
966 // define a class but do not make it known to the class loader or system dictionary
967 // - host_class: supplies context for linkage, access control, protection domain, and class loader
968 // - data: bytes of a class file, a raw memory address (length gives the number of bytes)
969 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data
971 // When you load an anonymous class U, it works as if you changed its name just before loading,
972 // to a name that you will never use again. Since the name is lost, no other class can directly
973 // link to any member of U. Just after U is loaded, the only way to use it is reflectively,
974 // through java.lang.Class methods like Class.newInstance.
976 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
977 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
978 // An anonymous class also has special privileges to access any member of its host class.
979 // This is the main reason why this loading operation is unsafe. The purpose of this is to
980 // allow language implementations to simulate "open classes"; a host class in effect gets
981 // new code when an anonymous class is loaded alongside it. A less convenient but more
982 // standard way to do this is with reflection, which can also be set to ignore access
983 // restrictions.
985 // Access into an anonymous class is possible only through reflection. Therefore, there
986 // are no special access rules for calling into an anonymous class. The relaxed access
987 // rule for the host class is applied in the opposite direction: A host class reflectively
988 // access one of its anonymous classes.
990 // If you load the same bytecodes twice, you get two different classes. You can reload
991 // the same bytecodes with or without varying CP patches.
993 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
994 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
995 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
997 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
998 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
999 // It is not possible for a named class, or an older anonymous class, to refer by
1000 // name (via its CP) to a newer anonymous class.
1002 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
1003 // or type descriptors used in the loaded anonymous class.
1005 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
1006 // instead of "dead" strings. A compiled statement like println((Object)"hello") can
1007 // be changed to println(greeting), where greeting is an arbitrary object created before
1008 // the anonymous class is loaded. This is useful in dynamic languages, in which
1009 // various kinds of metaobjects must be introduced as constants into bytecode.
1010 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
1011 // not just a literal string. For such ldc instructions, the verifier uses the
1012 // type Object instead of String, if the loaded constant is not in fact a String.
1014 static instanceKlassHandle
1015 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
1016 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
1017 HeapWord* *temp_alloc,
1018 TRAPS) {
1020 if (UsePerfData) {
1021 ClassLoader::unsafe_defineClassCallCounter()->inc();
1022 }
1024 if (data == NULL) {
1025 THROW_0(vmSymbols::java_lang_NullPointerException());
1026 }
1028 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
1029 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
1030 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal);
1031 if (body == NULL) {
1032 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1033 }
1035 // caller responsible to free it:
1036 (*temp_alloc) = body;
1038 {
1039 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1040 Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1041 }
1043 u1* class_bytes = (u1*) body;
1044 int class_bytes_length = (int) length;
1045 if (class_bytes_length < 0) class_bytes_length = 0;
1046 if (class_bytes == NULL
1047 || host_class == NULL
1048 || length != class_bytes_length)
1049 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1051 objArrayHandle cp_patches_h;
1052 if (cp_patches_jh != NULL) {
1053 oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1054 if (!p->is_objArray())
1055 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1056 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1057 }
1059 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class)));
1060 const char* host_source = host_klass->external_name();
1061 Handle host_loader(THREAD, host_klass->class_loader());
1062 Handle host_domain(THREAD, host_klass->protection_domain());
1064 GrowableArray<Handle>* cp_patches = NULL;
1065 if (cp_patches_h.not_null()) {
1066 int alen = cp_patches_h->length();
1067 for (int i = alen-1; i >= 0; i--) {
1068 oop p = cp_patches_h->obj_at(i);
1069 if (p != NULL) {
1070 Handle patch(THREAD, p);
1071 if (cp_patches == NULL)
1072 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1073 cp_patches->at_put(i, patch);
1074 }
1075 }
1076 }
1078 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1080 instanceKlassHandle anon_klass;
1081 {
1082 Symbol* no_class_name = NULL;
1083 Klass* anonk = SystemDictionary::parse_stream(no_class_name,
1084 host_loader, host_domain,
1085 &st, host_klass, cp_patches,
1086 CHECK_NULL);
1087 if (anonk == NULL) return NULL;
1088 anon_klass = instanceKlassHandle(THREAD, anonk);
1089 }
1091 return anon_klass;
1092 }
1094 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1095 {
1096 instanceKlassHandle anon_klass;
1097 jobject res_jh = NULL;
1099 UnsafeWrapper("Unsafe_DefineAnonymousClass");
1100 ResourceMark rm(THREAD);
1102 HeapWord* temp_alloc = NULL;
1104 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data,
1105 cp_patches_jh,
1106 &temp_alloc, THREAD);
1107 if (anon_klass() != NULL)
1108 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
1110 // try/finally clause:
1111 if (temp_alloc != NULL) {
1112 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal);
1113 }
1115 // The anonymous class loader data has been artificially been kept alive to
1116 // this point. The mirror and any instances of this class have to keep
1117 // it alive afterwards.
1118 if (anon_klass() != NULL) {
1119 anon_klass->class_loader_data()->set_keep_alive(false);
1120 }
1122 // let caller initialize it as needed...
1124 return (jclass) res_jh;
1125 }
1126 UNSAFE_END
1130 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1131 UnsafeWrapper("Unsafe_MonitorEnter");
1132 {
1133 if (jobj == NULL) {
1134 THROW(vmSymbols::java_lang_NullPointerException());
1135 }
1136 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1137 ObjectSynchronizer::jni_enter(obj, CHECK);
1138 }
1139 UNSAFE_END
1142 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1143 UnsafeWrapper("Unsafe_TryMonitorEnter");
1144 {
1145 if (jobj == NULL) {
1146 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1147 }
1148 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1149 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1150 return (res ? JNI_TRUE : JNI_FALSE);
1151 }
1152 UNSAFE_END
1155 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1156 UnsafeWrapper("Unsafe_MonitorExit");
1157 {
1158 if (jobj == NULL) {
1159 THROW(vmSymbols::java_lang_NullPointerException());
1160 }
1161 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1162 ObjectSynchronizer::jni_exit(obj(), CHECK);
1163 }
1164 UNSAFE_END
1167 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1168 UnsafeWrapper("Unsafe_ThrowException");
1169 {
1170 ThreadToNativeFromVM ttnfv(thread);
1171 env->Throw(thr);
1172 }
1173 UNSAFE_END
1175 // JSR166 ------------------------------------------------------------------
1177 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1178 UnsafeWrapper("Unsafe_CompareAndSwapObject");
1179 oop x = JNIHandles::resolve(x_h);
1180 oop e = JNIHandles::resolve(e_h);
1181 oop p = JNIHandles::resolve(obj);
1182 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1183 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
1184 jboolean success = (res == e);
1185 if (success)
1186 update_barrier_set((void*)addr, x);
1187 return success;
1188 UNSAFE_END
1190 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1191 UnsafeWrapper("Unsafe_CompareAndSwapInt");
1192 oop p = JNIHandles::resolve(obj);
1193 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1194 return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1195 UNSAFE_END
1197 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1198 UnsafeWrapper("Unsafe_CompareAndSwapLong");
1199 Handle p (THREAD, JNIHandles::resolve(obj));
1200 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1201 if (VM_Version::supports_cx8())
1202 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1203 else {
1204 jboolean success = false;
1205 ObjectLocker ol(p, THREAD);
1206 if (*addr == e) { *addr = x; success = true; }
1207 return success;
1208 }
1209 UNSAFE_END
1211 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1212 UnsafeWrapper("Unsafe_Park");
1213 #ifndef USDT2
1214 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1215 #else /* USDT2 */
1216 HOTSPOT_THREAD_PARK_BEGIN(
1217 (uintptr_t) thread->parker(), (int) isAbsolute, time);
1218 #endif /* USDT2 */
1219 JavaThreadParkedState jtps(thread, time != 0);
1220 thread->parker()->park(isAbsolute != 0, time);
1221 #ifndef USDT2
1222 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1223 #else /* USDT2 */
1224 HOTSPOT_THREAD_PARK_END(
1225 (uintptr_t) thread->parker());
1226 #endif /* USDT2 */
1227 UNSAFE_END
1229 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1230 UnsafeWrapper("Unsafe_Unpark");
1231 Parker* p = NULL;
1232 if (jthread != NULL) {
1233 oop java_thread = JNIHandles::resolve_non_null(jthread);
1234 if (java_thread != NULL) {
1235 jlong lp = java_lang_Thread::park_event(java_thread);
1236 if (lp != 0) {
1237 // This cast is OK even though the jlong might have been read
1238 // non-atomically on 32bit systems, since there, one word will
1239 // always be zero anyway and the value set is always the same
1240 p = (Parker*)addr_from_java(lp);
1241 } else {
1242 // Grab lock if apparently null or using older version of library
1243 MutexLocker mu(Threads_lock);
1244 java_thread = JNIHandles::resolve_non_null(jthread);
1245 if (java_thread != NULL) {
1246 JavaThread* thr = java_lang_Thread::thread(java_thread);
1247 if (thr != NULL) {
1248 p = thr->parker();
1249 if (p != NULL) { // Bind to Java thread for next time.
1250 java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1251 }
1252 }
1253 }
1254 }
1255 }
1256 }
1257 if (p != NULL) {
1258 #ifndef USDT2
1259 HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1260 #else /* USDT2 */
1261 HOTSPOT_THREAD_UNPARK(
1262 (uintptr_t) p);
1263 #endif /* USDT2 */
1264 p->unpark();
1265 }
1266 UNSAFE_END
1268 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1269 UnsafeWrapper("Unsafe_Loadavg");
1270 const int max_nelem = 3;
1271 double la[max_nelem];
1272 jint ret;
1274 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1275 assert(a->is_typeArray(), "must be type array");
1277 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1278 ThreadToNativeFromVM ttnfv(thread);
1279 throw_new(env, "ArrayIndexOutOfBoundsException");
1280 return -1;
1281 }
1283 ret = os::loadavg(la, nelem);
1284 if (ret == -1) return -1;
1286 // if successful, ret is the number of samples actually retrieved.
1287 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1288 switch(ret) {
1289 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1290 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1291 case 1: a->double_at_put(0, (jdouble)la[0]); break;
1292 }
1293 return ret;
1294 UNSAFE_END
1296 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1297 UnsafeWrapper("Unsafe_PrefetchRead");
1298 oop p = JNIHandles::resolve(obj);
1299 void* addr = index_oop_from_field_offset_long(p, 0);
1300 Prefetch::read(addr, (intx)offset);
1301 UNSAFE_END
1303 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1304 UnsafeWrapper("Unsafe_PrefetchWrite");
1305 oop p = JNIHandles::resolve(obj);
1306 void* addr = index_oop_from_field_offset_long(p, 0);
1307 Prefetch::write(addr, (intx)offset);
1308 UNSAFE_END
1311 /// JVM_RegisterUnsafeMethods
1313 #define ADR "J"
1315 #define LANG "Ljava/lang/"
1317 #define OBJ LANG"Object;"
1318 #define CLS LANG"Class;"
1319 #define CTR LANG"reflect/Constructor;"
1320 #define FLD LANG"reflect/Field;"
1321 #define MTH LANG"reflect/Method;"
1322 #define THR LANG"Throwable;"
1324 #define DC0_Args LANG"String;[BII"
1325 #define DC1_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1327 #define CC (char*) /*cast a literal from (const char*)*/
1328 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1330 // define deprecated accessors for compabitility with 1.4.0
1331 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1332 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \
1333 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)}
1335 // Note: In 1.4.1, getObject and kin take both int and long offsets.
1336 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1337 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1338 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}
1340 // Note: In 1.5.0, there are volatile versions too
1341 #define DECLARE_GETSETOOP(Boolean, Z) \
1342 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \
1343 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \
1344 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1345 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)}
1348 #define DECLARE_GETSETNATIVE(Byte, B) \
1349 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \
1350 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)}
1354 // %%% These are temporarily supported until the SDK sources
1355 // contain the necessarily updated Unsafe.java.
1356 static JNINativeMethod methods_140[] = {
1358 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)},
1359 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)},
1361 DECLARE_GETSETOOP_140(Boolean, Z),
1362 DECLARE_GETSETOOP_140(Byte, B),
1363 DECLARE_GETSETOOP_140(Short, S),
1364 DECLARE_GETSETOOP_140(Char, C),
1365 DECLARE_GETSETOOP_140(Int, I),
1366 DECLARE_GETSETOOP_140(Long, J),
1367 DECLARE_GETSETOOP_140(Float, F),
1368 DECLARE_GETSETOOP_140(Double, D),
1370 DECLARE_GETSETNATIVE(Byte, B),
1371 DECLARE_GETSETNATIVE(Short, S),
1372 DECLARE_GETSETNATIVE(Char, C),
1373 DECLARE_GETSETNATIVE(Int, I),
1374 DECLARE_GETSETNATIVE(Long, J),
1375 DECLARE_GETSETNATIVE(Float, F),
1376 DECLARE_GETSETNATIVE(Double, D),
1378 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1379 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1381 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1382 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1383 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1384 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1385 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1387 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, //deprecated
1388 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, //deprecated
1389 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1390 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1391 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1392 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1393 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1395 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1396 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1397 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1398 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1399 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1400 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1401 };
1403 // These are the old methods prior to the JSR 166 changes in 1.5.0
1404 static JNINativeMethod methods_141[] = {
1406 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1407 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1409 DECLARE_GETSETOOP_141(Boolean, Z),
1410 DECLARE_GETSETOOP_141(Byte, B),
1411 DECLARE_GETSETOOP_141(Short, S),
1412 DECLARE_GETSETOOP_141(Char, C),
1413 DECLARE_GETSETOOP_141(Int, I),
1414 DECLARE_GETSETOOP_141(Long, J),
1415 DECLARE_GETSETOOP_141(Float, F),
1416 DECLARE_GETSETOOP_141(Double, D),
1418 DECLARE_GETSETNATIVE(Byte, B),
1419 DECLARE_GETSETNATIVE(Short, S),
1420 DECLARE_GETSETNATIVE(Char, C),
1421 DECLARE_GETSETNATIVE(Int, I),
1422 DECLARE_GETSETNATIVE(Long, J),
1423 DECLARE_GETSETNATIVE(Float, F),
1424 DECLARE_GETSETNATIVE(Double, D),
1426 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1427 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1429 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1430 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1431 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1432 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1433 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1435 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1436 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1437 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1438 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1439 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1440 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1441 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1442 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1444 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1445 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1446 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1447 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1448 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1449 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}
1451 };
1453 // These are the old methods prior to the JSR 166 changes in 1.6.0
1454 static JNINativeMethod methods_15[] = {
1456 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1457 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1458 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1459 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1462 DECLARE_GETSETOOP(Boolean, Z),
1463 DECLARE_GETSETOOP(Byte, B),
1464 DECLARE_GETSETOOP(Short, S),
1465 DECLARE_GETSETOOP(Char, C),
1466 DECLARE_GETSETOOP(Int, I),
1467 DECLARE_GETSETOOP(Long, J),
1468 DECLARE_GETSETOOP(Float, F),
1469 DECLARE_GETSETOOP(Double, D),
1471 DECLARE_GETSETNATIVE(Byte, B),
1472 DECLARE_GETSETNATIVE(Short, S),
1473 DECLARE_GETSETNATIVE(Char, C),
1474 DECLARE_GETSETNATIVE(Int, I),
1475 DECLARE_GETSETNATIVE(Long, J),
1476 DECLARE_GETSETNATIVE(Float, F),
1477 DECLARE_GETSETNATIVE(Double, D),
1479 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1480 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1482 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1483 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1484 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1485 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1486 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1488 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1489 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1490 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1491 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1492 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1493 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1494 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1495 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1497 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1498 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1499 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1500 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1501 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1502 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1503 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1504 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1505 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1506 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1507 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1509 };
1511 // These are the correct methods, moving forward:
1512 static JNINativeMethod methods[] = {
1514 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)},
1515 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)},
1516 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)},
1517 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)},
1520 DECLARE_GETSETOOP(Boolean, Z),
1521 DECLARE_GETSETOOP(Byte, B),
1522 DECLARE_GETSETOOP(Short, S),
1523 DECLARE_GETSETOOP(Char, C),
1524 DECLARE_GETSETOOP(Int, I),
1525 DECLARE_GETSETOOP(Long, J),
1526 DECLARE_GETSETOOP(Float, F),
1527 DECLARE_GETSETOOP(Double, D),
1529 DECLARE_GETSETNATIVE(Byte, B),
1530 DECLARE_GETSETNATIVE(Short, S),
1531 DECLARE_GETSETNATIVE(Char, C),
1532 DECLARE_GETSETNATIVE(Int, I),
1533 DECLARE_GETSETNATIVE(Long, J),
1534 DECLARE_GETSETNATIVE(Float, F),
1535 DECLARE_GETSETNATIVE(Double, D),
1537 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)},
1538 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)},
1540 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)},
1541 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)},
1542 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1543 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)},
1544 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)},
1546 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)},
1547 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)},
1548 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)},
1549 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)},
1550 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)},
1551 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)},
1552 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)},
1553 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)},
1555 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)},
1556 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)},
1557 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)},
1558 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)},
1559 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)},
1560 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)},
1561 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)},
1562 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)},
1563 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)},
1564 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)},
1565 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)},
1566 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)},
1567 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)},
1568 {CC"loadFence", CC"()V", FN_PTR(Unsafe_LoadFence)},
1569 {CC"storeFence", CC"()V", FN_PTR(Unsafe_StoreFence)},
1570 {CC"fullFence", CC"()V", FN_PTR(Unsafe_FullFence)},
1571 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)},
1572 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)}
1574 // {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)},
1576 // {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1577 // {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1578 // {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1579 // {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1581 };
1583 JNINativeMethod loadavg_method[] = {
1584 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}
1585 };
1587 JNINativeMethod prefetch_methods[] = {
1588 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1589 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)},
1590 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)},
1591 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}
1592 };
1594 JNINativeMethod memcopy_methods[] = {
1595 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)},
1596 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)}
1597 };
1599 JNINativeMethod memcopy_methods_15[] = {
1600 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)},
1601 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}
1602 };
1604 JNINativeMethod anonk_methods[] = {
1605 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)},
1606 };
1608 JNINativeMethod lform_methods[] = {
1609 {CC"shouldBeInitialized",CC"("CLS")Z", FN_PTR(Unsafe_ShouldBeInitialized)},
1610 };
1612 #undef CC
1613 #undef FN_PTR
1615 #undef ADR
1616 #undef LANG
1617 #undef OBJ
1618 #undef CLS
1619 #undef CTR
1620 #undef FLD
1621 #undef MTH
1622 #undef THR
1623 #undef DC0_Args
1624 #undef DC1_Args
1626 #undef DECLARE_GETSETOOP
1627 #undef DECLARE_GETSETNATIVE
1630 // This one function is exported, used by NativeLookup.
1631 // The Unsafe_xxx functions above are called only from the interpreter.
1632 // The optimizer looks at names and signatures to recognize
1633 // individual functions.
1635 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1636 UnsafeWrapper("JVM_RegisterUnsafeMethods");
1637 {
1638 ThreadToNativeFromVM ttnfv(thread);
1639 {
1640 env->RegisterNatives(unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1641 if (env->ExceptionOccurred()) {
1642 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1643 tty->print_cr("Warning: SDK 1.6 Unsafe.loadavg not found.");
1644 }
1645 env->ExceptionClear();
1646 }
1647 }
1648 {
1649 env->RegisterNatives(unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1650 if (env->ExceptionOccurred()) {
1651 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1652 tty->print_cr("Warning: SDK 1.6 Unsafe.prefetchRead/Write not found.");
1653 }
1654 env->ExceptionClear();
1655 }
1656 }
1657 {
1658 env->RegisterNatives(unsafecls, memcopy_methods, sizeof(memcopy_methods)/sizeof(JNINativeMethod));
1659 if (env->ExceptionOccurred()) {
1660 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1661 tty->print_cr("Warning: SDK 1.7 Unsafe.copyMemory not found.");
1662 }
1663 env->ExceptionClear();
1664 env->RegisterNatives(unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1665 if (env->ExceptionOccurred()) {
1666 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1667 tty->print_cr("Warning: SDK 1.5 Unsafe.copyMemory not found.");
1668 }
1669 env->ExceptionClear();
1670 }
1671 }
1672 }
1673 if (EnableInvokeDynamic) {
1674 env->RegisterNatives(unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1675 if (env->ExceptionOccurred()) {
1676 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1677 tty->print_cr("Warning: SDK 1.7 Unsafe.defineClass (anonymous version) not found.");
1678 }
1679 env->ExceptionClear();
1680 }
1681 }
1682 if (EnableInvokeDynamic) {
1683 env->RegisterNatives(unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod));
1684 if (env->ExceptionOccurred()) {
1685 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1686 tty->print_cr("Warning: SDK 1.7 LambdaForm support in Unsafe not found.");
1687 }
1688 env->ExceptionClear();
1689 }
1690 }
1691 int status = env->RegisterNatives(unsafecls, methods, sizeof(methods)/sizeof(JNINativeMethod));
1692 if (env->ExceptionOccurred()) {
1693 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1694 tty->print_cr("Warning: SDK 1.6 version of Unsafe not found.");
1695 }
1696 env->ExceptionClear();
1697 // %%% For now, be backward compatible with an older class:
1698 status = env->RegisterNatives(unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1699 }
1700 if (env->ExceptionOccurred()) {
1701 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1702 tty->print_cr("Warning: SDK 1.5 version of Unsafe not found.");
1703 }
1704 env->ExceptionClear();
1705 // %%% For now, be backward compatible with an older class:
1706 status = env->RegisterNatives(unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1707 }
1708 if (env->ExceptionOccurred()) {
1709 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1710 tty->print_cr("Warning: SDK 1.4.1 version of Unsafe not found.");
1711 }
1712 env->ExceptionClear();
1713 // %%% For now, be backward compatible with an older class:
1714 status = env->RegisterNatives(unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1715 }
1716 guarantee(status == 0, "register unsafe natives");
1717 }
1718 JVM_END
