1 /* 2 * Copyright (c) 2000, 2024, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classFileStream.hpp" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/classLoadInfo.hpp" 29 #include "classfile/javaClasses.inline.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "jfr/jfrEvents.hpp" 33 #include "jni.h" 34 #include "jvm.h" 35 #include "memory/allocation.inline.hpp" 36 #include "memory/resourceArea.hpp" 37 #include "logging/log.hpp" 38 #include "logging/logStream.hpp" 39 #include "oops/access.inline.hpp" 40 #include "oops/fieldStreams.inline.hpp" 41 #include "oops/flatArrayKlass.hpp" 42 #include "oops/flatArrayOop.inline.hpp" 43 #include "oops/inlineKlass.inline.hpp" 44 #include "oops/instanceKlass.inline.hpp" 45 #include "oops/klass.inline.hpp" 46 #include "oops/objArrayOop.inline.hpp" 47 #include "oops/oop.inline.hpp" 48 #include "oops/typeArrayOop.inline.hpp" 49 #include "prims/jvmtiExport.hpp" 50 #include "prims/unsafe.hpp" 51 #include "runtime/fieldDescriptor.inline.hpp" 52 #include "runtime/globals.hpp" 53 #include "runtime/handles.inline.hpp" 54 #include "runtime/interfaceSupport.inline.hpp" 55 #include "runtime/javaThread.inline.hpp" 56 #include "runtime/jniHandles.inline.hpp" 57 #include "runtime/orderAccess.hpp" 58 #include "runtime/reflection.hpp" 59 #include "runtime/sharedRuntime.hpp" 60 #include "runtime/stubRoutines.hpp" 61 #include "runtime/threadSMR.hpp" 62 #include "runtime/vmOperations.hpp" 63 #include "runtime/vm_version.hpp" 64 #include "sanitizers/ub.hpp" 65 #include "services/threadService.hpp" 66 #include "utilities/align.hpp" 67 #include "utilities/copy.hpp" 68 #include "utilities/dtrace.hpp" 69 #include "utilities/macros.hpp" 70 71 /** 72 * Implementation of the jdk.internal.misc.Unsafe class 73 */ 74 75 76 #define MAX_OBJECT_SIZE \ 77 ( arrayOopDesc::base_offset_in_bytes(T_DOUBLE) \ 78 + ((julong)max_jint * sizeof(double)) ) 79 80 #define UNSAFE_ENTRY(result_type, header) \ 81 JVM_ENTRY(static result_type, header) 82 83 #define UNSAFE_LEAF(result_type, header) \ 84 JVM_LEAF(static result_type, header) 85 86 // All memory access methods (e.g. getInt, copyMemory) must use this macro. 87 // We call these methods "scoped" methods, as access to these methods is 88 // typically governed by a "scope" (a MemorySessionImpl object), and no 89 // access is allowed when the scope is no longer alive. 90 // 91 // Closing a scope object (cf. scopedMemoryAccess.cpp) can install 92 // an async exception during a safepoint. When that happens, 93 // scoped methods are not allowed to touch the underlying memory (as that 94 // memory might have been released). Therefore, when entering a scoped method 95 // we check if an async exception has been installed, and return immediately 96 // if that is the case. 97 // 98 // As a rule, we disallow safepoints in the middle of a scoped method. 99 // If an async exception handshake were installed in such a safepoint, 100 // memory access might still occur before the handshake is honored by 101 // the accessing thread. 102 // 103 // Corollary: as threads in native state are considered to be at a safepoint, 104 // scoped methods must NOT be executed while in the native thread state. 105 // Because of this, there can be no UNSAFE_LEAF_SCOPED. 106 #define UNSAFE_ENTRY_SCOPED(result_type, header) \ 107 JVM_ENTRY(static result_type, header) \ 108 if (thread->has_async_exception_condition()) {return (result_type)0;} 109 110 #define UNSAFE_END JVM_END 111 112 113 static inline void* addr_from_java(jlong addr) { 114 // This assert fails in a variety of ways on 32-bit systems. 115 // It is impossible to predict whether native code that converts 116 // pointers to longs will sign-extend or zero-extend the addresses. 117 //assert(addr == (uintptr_t)addr, "must not be odd high bits"); 118 return (void*)(uintptr_t)addr; 119 } 120 121 static inline jlong addr_to_java(void* p) { 122 assert(p == (void*)(uintptr_t)p, "must not be odd high bits"); 123 return (uintptr_t)p; 124 } 125 126 127 // Note: The VM's obj_field and related accessors use byte-scaled 128 // ("unscaled") offsets, just as the unsafe methods do. 129 130 // However, the method Unsafe.fieldOffset explicitly declines to 131 // guarantee this. The field offset values manipulated by the Java user 132 // through the Unsafe API are opaque cookies that just happen to be byte 133 // offsets. We represent this state of affairs by passing the cookies 134 // through conversion functions when going between the VM and the Unsafe API. 135 // The conversion functions just happen to be no-ops at present. 136 137 static inline jlong field_offset_to_byte_offset(jlong field_offset) { 138 return field_offset; 139 } 140 141 static inline int field_offset_from_byte_offset(int byte_offset) { 142 return byte_offset; 143 } 144 145 static inline void assert_field_offset_sane(oop p, jlong field_offset) { 146 #ifdef ASSERT 147 jlong byte_offset = field_offset_to_byte_offset(field_offset); 148 149 if (p != nullptr) { 150 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset"); 151 if (byte_offset == (jint)byte_offset) { 152 void* ptr_plus_disp = cast_from_oop<address>(p) + byte_offset; 153 assert(p->field_addr<void>((jint)byte_offset) == ptr_plus_disp, 154 "raw [ptr+disp] must be consistent with oop::field_addr"); 155 } 156 jlong p_size = HeapWordSize * (jlong)(p->size()); 157 assert(byte_offset < p_size, "Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, (int64_t)byte_offset, (int64_t)p_size); 158 } 159 #endif 160 } 161 162 static inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) { 163 assert_field_offset_sane(p, field_offset); 164 uintptr_t base_address = cast_from_oop<uintptr_t>(p); 165 uintptr_t byte_offset = (uintptr_t)field_offset_to_byte_offset(field_offset); 166 return (void*)(base_address + byte_offset); 167 } 168 169 // Externally callable versions: 170 // (Use these in compiler intrinsics which emulate unsafe primitives.) 171 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) { 172 return field_offset; 173 } 174 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) { 175 return byte_offset; 176 } 177 178 ///// Data read/writes on the Java heap and in native (off-heap) memory 179 180 /** 181 * Helper class to wrap memory accesses in JavaThread::doing_unsafe_access() 182 */ 183 class GuardUnsafeAccess { 184 JavaThread* _thread; 185 186 public: 187 GuardUnsafeAccess(JavaThread* thread) : _thread(thread) { 188 // native/off-heap access which may raise SIGBUS if accessing 189 // memory mapped file data in a region of the file which has 190 // been truncated and is now invalid. 191 _thread->set_doing_unsafe_access(true); 192 } 193 194 ~GuardUnsafeAccess() { 195 _thread->set_doing_unsafe_access(false); 196 } 197 }; 198 199 /** 200 * Helper class for accessing memory. 201 * 202 * Normalizes values and wraps accesses in 203 * JavaThread::doing_unsafe_access() if needed. 204 */ 205 template <typename T> 206 class MemoryAccess : StackObj { 207 JavaThread* _thread; 208 oop _obj; 209 ptrdiff_t _offset; 210 211 // Resolves and returns the address of the memory access. 212 // This raw memory access may fault, so we make sure it happens within the 213 // guarded scope by making the access volatile at least. Since the store 214 // of Thread::set_doing_unsafe_access() is also volatile, these accesses 215 // can not be reordered by the compiler. Therefore, if the access triggers 216 // a fault, we will know that Thread::doing_unsafe_access() returns true. 217 volatile T* addr() { 218 void* addr = index_oop_from_field_offset_long(_obj, _offset); 219 return static_cast<volatile T*>(addr); 220 } 221 222 template <typename U> 223 U normalize_for_write(U x) { 224 return x; 225 } 226 227 jboolean normalize_for_write(jboolean x) { 228 return x & 1; 229 } 230 231 template <typename U> 232 U normalize_for_read(U x) { 233 return x; 234 } 235 236 jboolean normalize_for_read(jboolean x) { 237 return x != 0; 238 } 239 240 public: 241 MemoryAccess(JavaThread* thread, jobject obj, jlong offset) 242 : _thread(thread), _obj(JNIHandles::resolve(obj)), _offset((ptrdiff_t)offset) { 243 assert_field_offset_sane(_obj, offset); 244 } 245 246 T get() { 247 GuardUnsafeAccess guard(_thread); 248 return normalize_for_read(*addr()); 249 } 250 251 // we use this method at some places for writing to 0 e.g. to cause a crash; 252 // ubsan does not know that this is the desired behavior 253 ATTRIBUTE_NO_UBSAN 254 void put(T x) { 255 GuardUnsafeAccess guard(_thread); 256 assert(_obj == nullptr || !_obj->is_inline_type() || _obj->mark().is_larval_state(), "must be an object instance or a larval inline type"); 257 *addr() = normalize_for_write(x); 258 } 259 260 T get_volatile() { 261 GuardUnsafeAccess guard(_thread); 262 volatile T ret = RawAccess<MO_SEQ_CST>::load(addr()); 263 return normalize_for_read(ret); 264 } 265 266 void put_volatile(T x) { 267 GuardUnsafeAccess guard(_thread); 268 RawAccess<MO_SEQ_CST>::store(addr(), normalize_for_write(x)); 269 } 270 }; 271 272 #ifdef ASSERT 273 /* 274 * Get the field descriptor of the field of the given object at the given offset. 275 */ 276 static bool get_field_descriptor(oop p, jlong offset, fieldDescriptor* fd) { 277 bool found = false; 278 Klass* k = p->klass(); 279 if (k->is_instance_klass()) { 280 InstanceKlass* ik = InstanceKlass::cast(k); 281 found = ik->find_field_from_offset((int)offset, false, fd); 282 if (!found && ik->is_mirror_instance_klass()) { 283 Klass* k2 = java_lang_Class::as_Klass(p); 284 if (k2->is_instance_klass()) { 285 ik = InstanceKlass::cast(k2); 286 found = ik->find_field_from_offset((int)offset, true, fd); 287 } 288 } 289 } 290 return found; 291 } 292 #endif // ASSERT 293 294 static void assert_and_log_unsafe_value_access(oop p, jlong offset, InlineKlass* vk) { 295 Klass* k = p->klass(); 296 #ifdef ASSERT 297 if (k->is_instance_klass()) { 298 assert_field_offset_sane(p, offset); 299 fieldDescriptor fd; 300 bool found = get_field_descriptor(p, offset, &fd); 301 if (found) { 302 assert(found, "value field not found"); 303 assert(fd.is_flat(), "field not flat"); 304 } else { 305 if (log_is_enabled(Trace, valuetypes)) { 306 log_trace(valuetypes)("not a field in %s at offset " UINT64_FORMAT_X, 307 p->klass()->external_name(), (uint64_t)offset); 308 } 309 } 310 } else if (k->is_flatArray_klass()) { 311 FlatArrayKlass* vak = FlatArrayKlass::cast(k); 312 int index = (offset - vak->array_header_in_bytes()) / vak->element_byte_size(); 313 address dest = (address)((flatArrayOop)p)->value_at_addr(index, vak->layout_helper()); 314 assert(dest == (cast_from_oop<address>(p) + offset), "invalid offset"); 315 } else { 316 ShouldNotReachHere(); 317 } 318 #endif // ASSERT 319 if (log_is_enabled(Trace, valuetypes)) { 320 if (k->is_flatArray_klass()) { 321 FlatArrayKlass* vak = FlatArrayKlass::cast(k); 322 int index = (offset - vak->array_header_in_bytes()) / vak->element_byte_size(); 323 address dest = (address)((flatArrayOop)p)->value_at_addr(index, vak->layout_helper()); 324 log_trace(valuetypes)("%s array type %s index %d element size %d offset " UINT64_FORMAT_X " at " INTPTR_FORMAT, 325 p->klass()->external_name(), vak->external_name(), 326 index, vak->element_byte_size(), (uint64_t)offset, p2i(dest)); 327 } else { 328 log_trace(valuetypes)("%s field type %s at offset " UINT64_FORMAT_X, 329 p->klass()->external_name(), vk->external_name(), (uint64_t)offset); 330 } 331 } 332 } 333 334 // These functions allow a null base pointer with an arbitrary address. 335 // But if the base pointer is non-null, the offset should make some sense. 336 // That is, it should be in the range [0, MAX_OBJECT_SIZE]. 337 UNSAFE_ENTRY(jobject, Unsafe_GetReference(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) { 338 oop p = JNIHandles::resolve(obj); 339 assert_field_offset_sane(p, offset); 340 oop v = HeapAccess<ON_UNKNOWN_OOP_REF>::oop_load_at(p, offset); 341 return JNIHandles::make_local(THREAD, v); 342 } UNSAFE_END 343 344 UNSAFE_ENTRY(void, Unsafe_PutReference(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) { 345 oop x = JNIHandles::resolve(x_h); 346 oop p = JNIHandles::resolve(obj); 347 assert_field_offset_sane(p, offset); 348 assert(!p->is_inline_type() || p->mark().is_larval_state(), "must be an object instance or a larval inline type"); 349 HeapAccess<ON_UNKNOWN_OOP_REF>::oop_store_at(p, offset, x); 350 } UNSAFE_END 351 352 UNSAFE_ENTRY(jlong, Unsafe_ValueHeaderSize(JNIEnv *env, jobject unsafe, jclass c)) { 353 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(c)); 354 InlineKlass* vk = InlineKlass::cast(k); 355 return vk->first_field_offset(); 356 } UNSAFE_END 357 358 UNSAFE_ENTRY(jboolean, Unsafe_IsFlatField(JNIEnv *env, jobject unsafe, jobject o)) { 359 oop f = JNIHandles::resolve_non_null(o); 360 Klass* k = java_lang_Class::as_Klass(java_lang_reflect_Field::clazz(f)); 361 int slot = java_lang_reflect_Field::slot(f); 362 return InstanceKlass::cast(k)->field_is_flat(slot); 363 } UNSAFE_END 364 365 UNSAFE_ENTRY(jboolean, Unsafe_HasNullMarker(JNIEnv *env, jobject unsage, jobject o)) { 366 oop f = JNIHandles::resolve_non_null(o); 367 Klass* k = java_lang_Class::as_Klass(java_lang_reflect_Field::clazz(f)); 368 int slot = java_lang_reflect_Field::slot(f); 369 return InstanceKlass::cast(k)->field_has_null_marker(slot); 370 } UNSAFE_END 371 372 UNSAFE_ENTRY(jint, Unsafe_NullMarkerOffset(JNIEnv *env, jobject unsage, jobject o)) { 373 oop f = JNIHandles::resolve_non_null(o); 374 Klass* k = java_lang_Class::as_Klass(java_lang_reflect_Field::clazz(f)); 375 int slot = java_lang_reflect_Field::slot(f); 376 return InstanceKlass::cast(k)->null_marker_offsets_array()->at(slot); 377 } UNSAFE_END 378 379 UNSAFE_ENTRY(jboolean, Unsafe_IsFlatArray(JNIEnv *env, jobject unsafe, jclass c)) { 380 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(c)); 381 return k->is_flatArray_klass(); 382 } UNSAFE_END 383 384 UNSAFE_ENTRY(jobject, Unsafe_UninitializedDefaultValue(JNIEnv *env, jobject unsafe, jclass vc)) { 385 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(vc)); 386 InlineKlass* vk = InlineKlass::cast(k); 387 oop v = vk->default_value(); 388 return JNIHandles::make_local(THREAD, v); 389 } UNSAFE_END 390 391 UNSAFE_ENTRY(jobject, Unsafe_GetValue(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jclass vc)) { 392 oop base = JNIHandles::resolve(obj); 393 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(vc)); 394 InlineKlass* vk = InlineKlass::cast(k); 395 assert_and_log_unsafe_value_access(base, offset, vk); 396 Handle base_h(THREAD, base); 397 oop v = vk->read_flat_field(base_h(), offset, CHECK_NULL); 398 return JNIHandles::make_local(THREAD, v); 399 } UNSAFE_END 400 401 UNSAFE_ENTRY(void, Unsafe_PutValue(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jclass vc, jobject value)) { 402 oop base = JNIHandles::resolve(obj); 403 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(vc)); 404 InlineKlass* vk = InlineKlass::cast(k); 405 assert(!base->is_inline_type() || base->mark().is_larval_state(), "must be an object instance or a larval inline type"); 406 assert_and_log_unsafe_value_access(base, offset, vk); 407 oop v = JNIHandles::resolve(value); 408 vk->write_flat_field(base, offset, v, CHECK); 409 } UNSAFE_END 410 411 UNSAFE_ENTRY(jobject, Unsafe_MakePrivateBuffer(JNIEnv *env, jobject unsafe, jobject value)) { 412 oop v = JNIHandles::resolve_non_null(value); 413 assert(v->is_inline_type(), "must be an inline type instance"); 414 Handle vh(THREAD, v); 415 InlineKlass* vk = InlineKlass::cast(v->klass()); 416 instanceOop new_value = vk->allocate_instance_buffer(CHECK_NULL); 417 vk->inline_copy_oop_to_new_oop(vh(), new_value); 418 markWord mark = new_value->mark(); 419 new_value->set_mark(mark.enter_larval_state()); 420 return JNIHandles::make_local(THREAD, new_value); 421 } UNSAFE_END 422 423 UNSAFE_ENTRY(jobject, Unsafe_FinishPrivateBuffer(JNIEnv *env, jobject unsafe, jobject value)) { 424 oop v = JNIHandles::resolve(value); 425 assert(v->mark().is_larval_state(), "must be a larval value"); 426 markWord mark = v->mark(); 427 v->set_mark(mark.exit_larval_state()); 428 return JNIHandles::make_local(THREAD, v); 429 } UNSAFE_END 430 431 UNSAFE_ENTRY(jobject, Unsafe_GetReferenceVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) { 432 oop p = JNIHandles::resolve(obj); 433 assert_field_offset_sane(p, offset); 434 oop v = HeapAccess<MO_SEQ_CST | ON_UNKNOWN_OOP_REF>::oop_load_at(p, offset); 435 return JNIHandles::make_local(THREAD, v); 436 } UNSAFE_END 437 438 UNSAFE_ENTRY(void, Unsafe_PutReferenceVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) { 439 oop x = JNIHandles::resolve(x_h); 440 oop p = JNIHandles::resolve(obj); 441 assert_field_offset_sane(p, offset); 442 HeapAccess<MO_SEQ_CST | ON_UNKNOWN_OOP_REF>::oop_store_at(p, offset, x); 443 } UNSAFE_END 444 445 UNSAFE_ENTRY(jobject, Unsafe_GetUncompressedObject(JNIEnv *env, jobject unsafe, jlong addr)) { 446 oop v = *(oop*) (address) addr; 447 return JNIHandles::make_local(THREAD, v); 448 } UNSAFE_END 449 450 #define DEFINE_GETSETOOP(java_type, Type) \ 451 \ 452 UNSAFE_ENTRY_SCOPED(java_type, Unsafe_Get##Type(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) { \ 453 return MemoryAccess<java_type>(thread, obj, offset).get(); \ 454 } UNSAFE_END \ 455 \ 456 UNSAFE_ENTRY_SCOPED(void, Unsafe_Put##Type(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, java_type x)) { \ 457 MemoryAccess<java_type>(thread, obj, offset).put(x); \ 458 } UNSAFE_END \ 459 \ 460 // END DEFINE_GETSETOOP. 461 462 DEFINE_GETSETOOP(jboolean, Boolean) 463 DEFINE_GETSETOOP(jbyte, Byte) 464 DEFINE_GETSETOOP(jshort, Short); 465 DEFINE_GETSETOOP(jchar, Char); 466 DEFINE_GETSETOOP(jint, Int); 467 DEFINE_GETSETOOP(jlong, Long); 468 DEFINE_GETSETOOP(jfloat, Float); 469 DEFINE_GETSETOOP(jdouble, Double); 470 471 #undef DEFINE_GETSETOOP 472 473 #define DEFINE_GETSETOOP_VOLATILE(java_type, Type) \ 474 \ 475 UNSAFE_ENTRY_SCOPED(java_type, Unsafe_Get##Type##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) { \ 476 return MemoryAccess<java_type>(thread, obj, offset).get_volatile(); \ 477 } UNSAFE_END \ 478 \ 479 UNSAFE_ENTRY_SCOPED(void, Unsafe_Put##Type##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, java_type x)) { \ 480 MemoryAccess<java_type>(thread, obj, offset).put_volatile(x); \ 481 } UNSAFE_END \ 482 \ 483 // END DEFINE_GETSETOOP_VOLATILE. 484 485 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) 486 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte) 487 DEFINE_GETSETOOP_VOLATILE(jshort, Short); 488 DEFINE_GETSETOOP_VOLATILE(jchar, Char); 489 DEFINE_GETSETOOP_VOLATILE(jint, Int); 490 DEFINE_GETSETOOP_VOLATILE(jlong, Long); 491 DEFINE_GETSETOOP_VOLATILE(jfloat, Float); 492 DEFINE_GETSETOOP_VOLATILE(jdouble, Double); 493 494 #undef DEFINE_GETSETOOP_VOLATILE 495 496 UNSAFE_LEAF(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe)) { 497 OrderAccess::fence(); 498 } UNSAFE_END 499 500 ////// Allocation requests 501 502 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls)) { 503 JvmtiVMObjectAllocEventCollector oam; 504 instanceOop i = InstanceKlass::allocate_instance(JNIHandles::resolve_non_null(cls), CHECK_NULL); 505 return JNIHandles::make_local(THREAD, i); 506 } UNSAFE_END 507 508 UNSAFE_LEAF(jlong, Unsafe_AllocateMemory0(JNIEnv *env, jobject unsafe, jlong size)) { 509 size_t sz = (size_t)size; 510 511 assert(is_aligned(sz, HeapWordSize), "sz not aligned"); 512 513 void* x = os::malloc(sz, mtOther); 514 515 return addr_to_java(x); 516 } UNSAFE_END 517 518 UNSAFE_LEAF(jlong, Unsafe_ReallocateMemory0(JNIEnv *env, jobject unsafe, jlong addr, jlong size)) { 519 void* p = addr_from_java(addr); 520 size_t sz = (size_t)size; 521 522 assert(is_aligned(sz, HeapWordSize), "sz not aligned"); 523 524 void* x = os::realloc(p, sz, mtOther); 525 526 return addr_to_java(x); 527 } UNSAFE_END 528 529 UNSAFE_LEAF(void, Unsafe_FreeMemory0(JNIEnv *env, jobject unsafe, jlong addr)) { 530 void* p = addr_from_java(addr); 531 532 os::free(p); 533 } UNSAFE_END 534 535 UNSAFE_ENTRY_SCOPED(void, Unsafe_SetMemory0(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value)) { 536 size_t sz = (size_t)size; 537 538 oop base = JNIHandles::resolve(obj); 539 void* p = index_oop_from_field_offset_long(base, offset); 540 541 { 542 GuardUnsafeAccess guard(thread); 543 if (StubRoutines::unsafe_setmemory() != nullptr) { 544 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXExec, thread)); 545 StubRoutines::UnsafeSetMemory_stub()(p, sz, value); 546 } else { 547 Copy::fill_to_memory_atomic(p, sz, value); 548 } 549 } 550 } UNSAFE_END 551 552 UNSAFE_ENTRY_SCOPED(void, Unsafe_CopyMemory0(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size)) { 553 size_t sz = (size_t)size; 554 555 oop srcp = JNIHandles::resolve(srcObj); 556 oop dstp = JNIHandles::resolve(dstObj); 557 558 void* src = index_oop_from_field_offset_long(srcp, srcOffset); 559 void* dst = index_oop_from_field_offset_long(dstp, dstOffset); 560 { 561 GuardUnsafeAccess guard(thread); 562 if (StubRoutines::unsafe_arraycopy() != nullptr) { 563 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXExec, thread)); 564 StubRoutines::UnsafeArrayCopy_stub()(src, dst, sz); 565 } else { 566 Copy::conjoint_memory_atomic(src, dst, sz); 567 } 568 } 569 } UNSAFE_END 570 571 UNSAFE_ENTRY_SCOPED(void, Unsafe_CopySwapMemory0(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size, jlong elemSize)) { 572 size_t sz = (size_t)size; 573 size_t esz = (size_t)elemSize; 574 575 oop srcp = JNIHandles::resolve(srcObj); 576 oop dstp = JNIHandles::resolve(dstObj); 577 578 address src = (address)index_oop_from_field_offset_long(srcp, srcOffset); 579 address dst = (address)index_oop_from_field_offset_long(dstp, dstOffset); 580 581 { 582 GuardUnsafeAccess guard(thread); 583 Copy::conjoint_swap(src, dst, sz, esz); 584 } 585 } UNSAFE_END 586 587 UNSAFE_LEAF (void, Unsafe_WriteBack0(JNIEnv *env, jobject unsafe, jlong line)) { 588 assert(VM_Version::supports_data_cache_line_flush(), "should not get here"); 589 #ifdef ASSERT 590 if (TraceMemoryWriteback) { 591 tty->print_cr("Unsafe: writeback 0x%p", addr_from_java(line)); 592 } 593 #endif 594 595 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXExec, Thread::current())); 596 assert(StubRoutines::data_cache_writeback() != nullptr, "sanity"); 597 (StubRoutines::DataCacheWriteback_stub())(addr_from_java(line)); 598 } UNSAFE_END 599 600 static void doWriteBackSync0(bool is_pre) 601 { 602 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXExec, Thread::current())); 603 assert(StubRoutines::data_cache_writeback_sync() != nullptr, "sanity"); 604 (StubRoutines::DataCacheWritebackSync_stub())(is_pre); 605 } 606 607 UNSAFE_LEAF (void, Unsafe_WriteBackPreSync0(JNIEnv *env, jobject unsafe)) { 608 assert(VM_Version::supports_data_cache_line_flush(), "should not get here"); 609 #ifdef ASSERT 610 if (TraceMemoryWriteback) { 611 tty->print_cr("Unsafe: writeback pre-sync"); 612 } 613 #endif 614 615 doWriteBackSync0(true); 616 } UNSAFE_END 617 618 UNSAFE_LEAF (void, Unsafe_WriteBackPostSync0(JNIEnv *env, jobject unsafe)) { 619 assert(VM_Version::supports_data_cache_line_flush(), "should not get here"); 620 #ifdef ASSERT 621 if (TraceMemoryWriteback) { 622 tty->print_cr("Unsafe: writeback pre-sync"); 623 } 624 #endif 625 626 doWriteBackSync0(false); 627 } UNSAFE_END 628 629 ////// Random queries 630 631 static jlong find_field_offset(jclass clazz, jstring name, TRAPS) { 632 assert(clazz != nullptr, "clazz must not be null"); 633 assert(name != nullptr, "name must not be null"); 634 635 ResourceMark rm(THREAD); 636 char *utf_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name)); 637 638 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz))); 639 640 jint offset = -1; 641 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 642 Symbol *name = fs.name(); 643 if (name->equals(utf_name)) { 644 offset = fs.offset(); 645 break; 646 } 647 } 648 if (offset < 0) { 649 THROW_0(vmSymbols::java_lang_InternalError()); 650 } 651 return field_offset_from_byte_offset(offset); 652 } 653 654 static jlong find_field_offset(jobject field, int must_be_static, TRAPS) { 655 assert(field != nullptr, "field must not be null"); 656 657 oop reflected = JNIHandles::resolve_non_null(field); 658 oop mirror = java_lang_reflect_Field::clazz(reflected); 659 Klass* k = java_lang_Class::as_Klass(mirror); 660 int slot = java_lang_reflect_Field::slot(reflected); 661 int modifiers = java_lang_reflect_Field::modifiers(reflected); 662 663 if (must_be_static >= 0) { 664 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0); 665 if (must_be_static != really_is_static) { 666 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 667 } 668 } 669 670 int offset = InstanceKlass::cast(k)->field_offset(slot); 671 return field_offset_from_byte_offset(offset); 672 } 673 674 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset0(JNIEnv *env, jobject unsafe, jobject field)) { 675 return find_field_offset(field, 0, THREAD); 676 } UNSAFE_END 677 678 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset1(JNIEnv *env, jobject unsafe, jclass c, jstring name)) { 679 return find_field_offset(c, name, THREAD); 680 } UNSAFE_END 681 682 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset0(JNIEnv *env, jobject unsafe, jobject field)) { 683 return find_field_offset(field, 1, THREAD); 684 } UNSAFE_END 685 686 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBase0(JNIEnv *env, jobject unsafe, jobject field)) { 687 assert(field != nullptr, "field must not be null"); 688 689 // Note: In this VM implementation, a field address is always a short 690 // offset from the base of a klass metaobject. Thus, the full dynamic 691 // range of the return type is never used. However, some implementations 692 // might put the static field inside an array shared by many classes, 693 // or even at a fixed address, in which case the address could be quite 694 // large. In that last case, this function would return null, since 695 // the address would operate alone, without any base pointer. 696 697 oop reflected = JNIHandles::resolve_non_null(field); 698 oop mirror = java_lang_reflect_Field::clazz(reflected); 699 int modifiers = java_lang_reflect_Field::modifiers(reflected); 700 701 if ((modifiers & JVM_ACC_STATIC) == 0) { 702 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 703 } 704 705 return JNIHandles::make_local(THREAD, mirror); 706 } UNSAFE_END 707 708 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized0(JNIEnv *env, jobject unsafe, jobject clazz)) { 709 assert(clazz != nullptr, "clazz must not be null"); 710 711 oop mirror = JNIHandles::resolve_non_null(clazz); 712 713 Klass* klass = java_lang_Class::as_Klass(mirror); 714 if (klass != nullptr && klass->should_be_initialized()) { 715 InstanceKlass* k = InstanceKlass::cast(klass); 716 k->initialize(CHECK); 717 } 718 } 719 UNSAFE_END 720 721 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized0(JNIEnv *env, jobject unsafe, jobject clazz)) { 722 assert(clazz != nullptr, "clazz must not be null"); 723 724 oop mirror = JNIHandles::resolve_non_null(clazz); 725 Klass* klass = java_lang_Class::as_Klass(mirror); 726 727 if (klass != nullptr && klass->should_be_initialized()) { 728 return true; 729 } 730 731 return false; 732 } 733 UNSAFE_END 734 735 static void getBaseAndScale(int& base, int& scale, jclass clazz, TRAPS) { 736 assert(clazz != nullptr, "clazz must not be null"); 737 738 oop mirror = JNIHandles::resolve_non_null(clazz); 739 Klass* k = java_lang_Class::as_Klass(mirror); 740 741 if (k == nullptr || !k->is_array_klass()) { 742 THROW(vmSymbols::java_lang_InvalidClassException()); 743 } else if (k->is_objArray_klass()) { 744 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT); 745 scale = heapOopSize; 746 } else if (k->is_typeArray_klass()) { 747 TypeArrayKlass* tak = TypeArrayKlass::cast(k); 748 base = tak->array_header_in_bytes(); 749 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok"); 750 scale = (1 << tak->log2_element_size()); 751 } else if (k->is_flatArray_klass()) { 752 FlatArrayKlass* vak = FlatArrayKlass::cast(k); 753 InlineKlass* vklass = vak->element_klass(); 754 base = vak->array_header_in_bytes(); 755 scale = vak->element_byte_size(); 756 } else { 757 ShouldNotReachHere(); 758 } 759 } 760 761 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset0(JNIEnv *env, jobject unsafe, jclass clazz)) { 762 int base = 0, scale = 0; 763 getBaseAndScale(base, scale, clazz, CHECK_0); 764 765 return field_offset_from_byte_offset(base); 766 } UNSAFE_END 767 768 769 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale0(JNIEnv *env, jobject unsafe, jclass clazz)) { 770 int base = 0, scale = 0; 771 getBaseAndScale(base, scale, clazz, CHECK_0); 772 773 // This VM packs both fields and array elements down to the byte. 774 // But watch out: If this changes, so that array references for 775 // a given primitive type (say, T_BOOLEAN) use different memory units 776 // than fields, this method MUST return zero for such arrays. 777 // For example, the VM used to store sub-word sized fields in full 778 // words in the object layout, so that accessors like getByte(Object,int) 779 // did not really do what one might expect for arrays. Therefore, 780 // this function used to report a zero scale factor, so that the user 781 // would know not to attempt to access sub-word array elements. 782 // // Code for unpacked fields: 783 // if (scale < wordSize) return 0; 784 785 // The following allows for a pretty general fieldOffset cookie scheme, 786 // but requires it to be linear in byte offset. 787 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0); 788 } UNSAFE_END 789 790 791 UNSAFE_ENTRY(jlong, Unsafe_GetObjectSize0(JNIEnv* env, jobject o, jobject obj)) 792 oop p = JNIHandles::resolve(obj); 793 return p->size() * HeapWordSize; 794 UNSAFE_END 795 796 797 static inline void throw_new(JNIEnv *env, const char *ename) { 798 jclass cls = env->FindClass(ename); 799 if (env->ExceptionCheck()) { 800 env->ExceptionClear(); 801 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", ename); 802 return; 803 } 804 805 env->ThrowNew(cls, nullptr); 806 } 807 808 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) { 809 // Code lifted from JDK 1.3 ClassLoader.c 810 811 jbyte *body; 812 char *utfName = nullptr; 813 jclass result = nullptr; 814 char buf[128]; 815 816 assert(data != nullptr, "Class bytes must not be null"); 817 assert(length >= 0, "length must not be negative: %d", length); 818 819 if (UsePerfData) { 820 ClassLoader::unsafe_defineClassCallCounter()->inc(); 821 } 822 823 body = NEW_C_HEAP_ARRAY_RETURN_NULL(jbyte, length, mtInternal); 824 if (body == nullptr) { 825 throw_new(env, "java/lang/OutOfMemoryError"); 826 return nullptr; 827 } 828 829 env->GetByteArrayRegion(data, offset, length, body); 830 if (env->ExceptionOccurred()) { 831 goto free_body; 832 } 833 834 if (name != nullptr) { 835 uint len = env->GetStringUTFLength(name); 836 int unicode_len = env->GetStringLength(name); 837 838 if (len >= sizeof(buf)) { 839 utfName = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len + 1, mtInternal); 840 if (utfName == nullptr) { 841 throw_new(env, "java/lang/OutOfMemoryError"); 842 goto free_body; 843 } 844 } else { 845 utfName = buf; 846 } 847 848 env->GetStringUTFRegion(name, 0, unicode_len, utfName); 849 850 for (uint i = 0; i < len; i++) { 851 if (utfName[i] == '.') utfName[i] = '/'; 852 } 853 } 854 855 result = JVM_DefineClass(env, utfName, loader, body, length, pd); 856 857 if (utfName && utfName != buf) { 858 FREE_C_HEAP_ARRAY(char, utfName); 859 } 860 861 free_body: 862 FREE_C_HEAP_ARRAY(jbyte, body); 863 return result; 864 } 865 866 867 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd)) { 868 ThreadToNativeFromVM ttnfv(thread); 869 870 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd); 871 } UNSAFE_END 872 873 874 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr)) { 875 ThreadToNativeFromVM ttnfv(thread); 876 env->Throw(thr); 877 } UNSAFE_END 878 879 // JSR166 ------------------------------------------------------------------ 880 881 UNSAFE_ENTRY(jobject, Unsafe_CompareAndExchangeReference(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h)) { 882 oop x = JNIHandles::resolve(x_h); 883 oop e = JNIHandles::resolve(e_h); 884 oop p = JNIHandles::resolve(obj); 885 assert_field_offset_sane(p, offset); 886 oop res = HeapAccess<ON_UNKNOWN_OOP_REF>::oop_atomic_cmpxchg_at(p, (ptrdiff_t)offset, e, x); 887 return JNIHandles::make_local(THREAD, res); 888 } UNSAFE_END 889 890 UNSAFE_ENTRY_SCOPED(jint, Unsafe_CompareAndExchangeInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x)) { 891 oop p = JNIHandles::resolve(obj); 892 volatile jint* addr = (volatile jint*)index_oop_from_field_offset_long(p, offset); 893 return Atomic::cmpxchg(addr, e, x); 894 } UNSAFE_END 895 896 UNSAFE_ENTRY_SCOPED(jlong, Unsafe_CompareAndExchangeLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x)) { 897 oop p = JNIHandles::resolve(obj); 898 volatile jlong* addr = (volatile jlong*)index_oop_from_field_offset_long(p, offset); 899 return Atomic::cmpxchg(addr, e, x); 900 } UNSAFE_END 901 902 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSetReference(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h)) { 903 oop x = JNIHandles::resolve(x_h); 904 oop e = JNIHandles::resolve(e_h); 905 oop p = JNIHandles::resolve(obj); 906 assert_field_offset_sane(p, offset); 907 oop ret = HeapAccess<ON_UNKNOWN_OOP_REF>::oop_atomic_cmpxchg_at(p, (ptrdiff_t)offset, e, x); 908 return ret == e; 909 } UNSAFE_END 910 911 UNSAFE_ENTRY_SCOPED(jboolean, Unsafe_CompareAndSetInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x)) { 912 oop p = JNIHandles::resolve(obj); 913 volatile jint* addr = (volatile jint*)index_oop_from_field_offset_long(p, offset); 914 return Atomic::cmpxchg(addr, e, x) == e; 915 } UNSAFE_END 916 917 UNSAFE_ENTRY_SCOPED(jboolean, Unsafe_CompareAndSetLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x)) { 918 oop p = JNIHandles::resolve(obj); 919 volatile jlong* addr = (volatile jlong*)index_oop_from_field_offset_long(p, offset); 920 return Atomic::cmpxchg(addr, e, x) == e; 921 } UNSAFE_END 922 923 static void post_thread_park_event(EventThreadPark* event, const oop obj, jlong timeout_nanos, jlong until_epoch_millis) { 924 assert(event != nullptr, "invariant"); 925 event->set_parkedClass((obj != nullptr) ? obj->klass() : nullptr); 926 event->set_timeout(timeout_nanos); 927 event->set_until(until_epoch_millis); 928 event->set_address((obj != nullptr) ? (u8)cast_from_oop<uintptr_t>(obj) : 0); 929 event->commit(); 930 } 931 932 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time)) { 933 HOTSPOT_THREAD_PARK_BEGIN((uintptr_t) thread->parker(), (int) isAbsolute, time); 934 EventThreadPark event; 935 936 JavaThreadParkedState jtps(thread, time != 0); 937 thread->parker()->park(isAbsolute != 0, time); 938 if (event.should_commit()) { 939 const oop obj = thread->current_park_blocker(); 940 if (time == 0) { 941 post_thread_park_event(&event, obj, min_jlong, min_jlong); 942 } else { 943 if (isAbsolute != 0) { 944 post_thread_park_event(&event, obj, min_jlong, time); 945 } else { 946 post_thread_park_event(&event, obj, time, min_jlong); 947 } 948 } 949 } 950 HOTSPOT_THREAD_PARK_END((uintptr_t) thread->parker()); 951 } UNSAFE_END 952 953 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread)) { 954 if (jthread != nullptr) { 955 oop thread_oop = JNIHandles::resolve_non_null(jthread); 956 // Get the JavaThread* stored in the java.lang.Thread object _before_ 957 // the embedded ThreadsListHandle is constructed so we know if the 958 // early life stage of the JavaThread* is protected. We use acquire 959 // here to ensure that if we see a non-nullptr value, then we also 960 // see the main ThreadsList updates from the JavaThread* being added. 961 FastThreadsListHandle ftlh(thread_oop, java_lang_Thread::thread_acquire(thread_oop)); 962 JavaThread* thr = ftlh.protected_java_thread(); 963 if (thr != nullptr) { 964 // The still live JavaThread* is protected by the FastThreadsListHandle 965 // so it is safe to access. 966 Parker* p = thr->parker(); 967 HOTSPOT_THREAD_UNPARK((uintptr_t) p); 968 p->unpark(); 969 } 970 } // FastThreadsListHandle is destroyed here. 971 } UNSAFE_END 972 973 UNSAFE_ENTRY(jint, Unsafe_GetLoadAverage0(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem)) { 974 const int max_nelem = 3; 975 double la[max_nelem]; 976 jint ret; 977 978 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg)); 979 assert(a->is_typeArray(), "must be type array"); 980 981 ret = os::loadavg(la, nelem); 982 if (ret == -1) { 983 return -1; 984 } 985 986 // if successful, ret is the number of samples actually retrieved. 987 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value"); 988 switch(ret) { 989 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through 990 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through 991 case 1: a->double_at_put(0, (jdouble)la[0]); break; 992 } 993 994 return ret; 995 } UNSAFE_END 996 997 998 /// JVM_RegisterUnsafeMethods 999 1000 #define ADR "J" 1001 1002 #define LANG "Ljava/lang/" 1003 1004 #define OBJ LANG "Object;" 1005 #define CLS LANG "Class;" 1006 #define FLD LANG "reflect/Field;" 1007 #define THR LANG "Throwable;" 1008 1009 #define DC_Args LANG "String;[BII" LANG "ClassLoader;" "Ljava/security/ProtectionDomain;" 1010 #define DAC_Args CLS "[B[" OBJ 1011 1012 #define CC (char*) /*cast a literal from (const char*)*/ 1013 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1014 1015 #define DECLARE_GETPUTOOP(Type, Desc) \ 1016 {CC "get" #Type, CC "(" OBJ "J)" #Desc, FN_PTR(Unsafe_Get##Type)}, \ 1017 {CC "put" #Type, CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Put##Type)}, \ 1018 {CC "get" #Type "Volatile", CC "(" OBJ "J)" #Desc, FN_PTR(Unsafe_Get##Type##Volatile)}, \ 1019 {CC "put" #Type "Volatile", CC "(" OBJ "J" #Desc ")V", FN_PTR(Unsafe_Put##Type##Volatile)} 1020 1021 1022 static JNINativeMethod jdk_internal_misc_Unsafe_methods[] = { 1023 {CC "getReference", CC "(" OBJ "J)" OBJ "", FN_PTR(Unsafe_GetReference)}, 1024 {CC "putReference", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_PutReference)}, 1025 {CC "getReferenceVolatile", CC "(" OBJ "J)" OBJ, FN_PTR(Unsafe_GetReferenceVolatile)}, 1026 {CC "putReferenceVolatile", CC "(" OBJ "J" OBJ ")V", FN_PTR(Unsafe_PutReferenceVolatile)}, 1027 1028 {CC "isFlatArray", CC "(" CLS ")Z", FN_PTR(Unsafe_IsFlatArray)}, 1029 {CC "isFlatField0", CC "(" OBJ ")Z", FN_PTR(Unsafe_IsFlatField)}, 1030 {CC "hasNullMarker0" , CC "(" OBJ ")Z", FN_PTR(Unsafe_HasNullMarker)}, 1031 {CC "nullMarkerOffset0", CC "(" OBJ ")I", FN_PTR(Unsafe_NullMarkerOffset)}, 1032 {CC "getValue", CC "(" OBJ "J" CLS ")" OBJ, FN_PTR(Unsafe_GetValue)}, 1033 {CC "putValue", CC "(" OBJ "J" CLS OBJ ")V", FN_PTR(Unsafe_PutValue)}, 1034 {CC "uninitializedDefaultValue", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_UninitializedDefaultValue)}, 1035 {CC "makePrivateBuffer", CC "(" OBJ ")" OBJ, FN_PTR(Unsafe_MakePrivateBuffer)}, 1036 {CC "finishPrivateBuffer", CC "(" OBJ ")" OBJ, FN_PTR(Unsafe_FinishPrivateBuffer)}, 1037 {CC "valueHeaderSize", CC "(" CLS ")J", FN_PTR(Unsafe_ValueHeaderSize)}, 1038 1039 {CC "getUncompressedObject", CC "(" ADR ")" OBJ, FN_PTR(Unsafe_GetUncompressedObject)}, 1040 1041 DECLARE_GETPUTOOP(Boolean, Z), 1042 DECLARE_GETPUTOOP(Byte, B), 1043 DECLARE_GETPUTOOP(Short, S), 1044 DECLARE_GETPUTOOP(Char, C), 1045 DECLARE_GETPUTOOP(Int, I), 1046 DECLARE_GETPUTOOP(Long, J), 1047 DECLARE_GETPUTOOP(Float, F), 1048 DECLARE_GETPUTOOP(Double, D), 1049 1050 {CC "allocateMemory0", CC "(J)" ADR, FN_PTR(Unsafe_AllocateMemory0)}, 1051 {CC "reallocateMemory0", CC "(" ADR "J)" ADR, FN_PTR(Unsafe_ReallocateMemory0)}, 1052 {CC "freeMemory0", CC "(" ADR ")V", FN_PTR(Unsafe_FreeMemory0)}, 1053 1054 {CC "objectFieldOffset0", CC "(" FLD ")J", FN_PTR(Unsafe_ObjectFieldOffset0)}, 1055 {CC "objectFieldOffset1", CC "(" CLS LANG "String;)J", FN_PTR(Unsafe_ObjectFieldOffset1)}, 1056 {CC "staticFieldOffset0", CC "(" FLD ")J", FN_PTR(Unsafe_StaticFieldOffset0)}, 1057 {CC "staticFieldBase0", CC "(" FLD ")" OBJ, FN_PTR(Unsafe_StaticFieldBase0)}, 1058 {CC "ensureClassInitialized0", CC "(" CLS ")V", FN_PTR(Unsafe_EnsureClassInitialized0)}, 1059 {CC "arrayBaseOffset0", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayBaseOffset0)}, 1060 {CC "arrayIndexScale0", CC "(" CLS ")I", FN_PTR(Unsafe_ArrayIndexScale0)}, 1061 {CC "getObjectSize0", CC "(Ljava/lang/Object;)J", FN_PTR(Unsafe_GetObjectSize0)}, 1062 1063 {CC "defineClass0", CC "(" DC_Args ")" CLS, FN_PTR(Unsafe_DefineClass0)}, 1064 {CC "allocateInstance", CC "(" CLS ")" OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1065 {CC "throwException", CC "(" THR ")V", FN_PTR(Unsafe_ThrowException)}, 1066 {CC "compareAndSetReference",CC "(" OBJ "J" OBJ "" OBJ ")Z", FN_PTR(Unsafe_CompareAndSetReference)}, 1067 {CC "compareAndSetInt", CC "(" OBJ "J""I""I"")Z", FN_PTR(Unsafe_CompareAndSetInt)}, 1068 {CC "compareAndSetLong", CC "(" OBJ "J""J""J"")Z", FN_PTR(Unsafe_CompareAndSetLong)}, 1069 {CC "compareAndExchangeReference", CC "(" OBJ "J" OBJ "" OBJ ")" OBJ, FN_PTR(Unsafe_CompareAndExchangeReference)}, 1070 {CC "compareAndExchangeInt", CC "(" OBJ "J""I""I"")I", FN_PTR(Unsafe_CompareAndExchangeInt)}, 1071 {CC "compareAndExchangeLong", CC "(" OBJ "J""J""J"")J", FN_PTR(Unsafe_CompareAndExchangeLong)}, 1072 1073 {CC "park", CC "(ZJ)V", FN_PTR(Unsafe_Park)}, 1074 {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)}, 1075 1076 {CC "getLoadAverage0", CC "([DI)I", FN_PTR(Unsafe_GetLoadAverage0)}, 1077 1078 {CC "copyMemory0", CC "(" OBJ "J" OBJ "JJ)V", FN_PTR(Unsafe_CopyMemory0)}, 1079 {CC "copySwapMemory0", CC "(" OBJ "J" OBJ "JJJ)V", FN_PTR(Unsafe_CopySwapMemory0)}, 1080 {CC "writeback0", CC "(" "J" ")V", FN_PTR(Unsafe_WriteBack0)}, 1081 {CC "writebackPreSync0", CC "()V", FN_PTR(Unsafe_WriteBackPreSync0)}, 1082 {CC "writebackPostSync0", CC "()V", FN_PTR(Unsafe_WriteBackPostSync0)}, 1083 {CC "setMemory0", CC "(" OBJ "JJB)V", FN_PTR(Unsafe_SetMemory0)}, 1084 1085 {CC "shouldBeInitialized0", CC "(" CLS ")Z", FN_PTR(Unsafe_ShouldBeInitialized0)}, 1086 1087 {CC "fullFence", CC "()V", FN_PTR(Unsafe_FullFence)}, 1088 }; 1089 1090 #undef CC 1091 #undef FN_PTR 1092 1093 #undef ADR 1094 #undef LANG 1095 #undef OBJ 1096 #undef CLS 1097 #undef FLD 1098 #undef THR 1099 #undef DC_Args 1100 #undef DAC_Args 1101 1102 #undef DECLARE_GETPUTOOP 1103 1104 1105 // This function is exported, used by NativeLookup. 1106 // The Unsafe_xxx functions above are called only from the interpreter. 1107 // The optimizer looks at names and signatures to recognize 1108 // individual functions. 1109 1110 JVM_ENTRY(void, JVM_RegisterJDKInternalMiscUnsafeMethods(JNIEnv *env, jclass unsafeclass)) { 1111 ThreadToNativeFromVM ttnfv(thread); 1112 1113 int ok = env->RegisterNatives(unsafeclass, jdk_internal_misc_Unsafe_methods, sizeof(jdk_internal_misc_Unsafe_methods)/sizeof(JNINativeMethod)); 1114 guarantee(ok == 0, "register jdk.internal.misc.Unsafe natives"); 1115 } JVM_END