unsafe.cpp revision 7426:0f6100dde08e
1/* 2 * Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "classfile/vmSymbols.hpp" 27#include "memory/allocation.inline.hpp" 28#include "prims/jni.h" 29#include "prims/jvm.h" 30#include "runtime/atomic.inline.hpp" 31#include "runtime/globals.hpp" 32#include "runtime/interfaceSupport.hpp" 33#include "runtime/prefetch.inline.hpp" 34#include "runtime/orderAccess.inline.hpp" 35#include "runtime/reflection.hpp" 36#include "runtime/synchronizer.hpp" 37#include "runtime/vm_version.hpp" 38#include "services/threadService.hpp" 39#include "trace/tracing.hpp" 40#include "utilities/copy.hpp" 41#include "utilities/dtrace.hpp" 42#include "utilities/macros.hpp" 43#if INCLUDE_ALL_GCS 44#include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" 45#endif // INCLUDE_ALL_GCS 46 47PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 48 49/* 50 * Implementation of class sun.misc.Unsafe 51 */ 52 53 54#define MAX_OBJECT_SIZE \ 55 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \ 56 + ((julong)max_jint * sizeof(double)) ) 57 58 59#define UNSAFE_ENTRY(result_type, header) \ 60 JVM_ENTRY(result_type, header) 61 62// Can't use UNSAFE_LEAF because it has the signature of a straight 63// call into the runtime (just like JVM_LEAF, funny that) but it's 64// called like a Java Native and thus the wrapper built for it passes 65// arguments like a JNI call. It expects those arguments to be popped 66// from the stack on Intel like all good JNI args are, and adjusts the 67// stack according. Since the JVM_LEAF call expects no extra 68// arguments the stack isn't popped in the C code, is pushed by the 69// wrapper and we get sick. 70//#define UNSAFE_LEAF(result_type, header) \ 71// JVM_LEAF(result_type, header) 72 73#define UNSAFE_END JVM_END 74 75#define UnsafeWrapper(arg) /*nothing, for the present*/ 76 77 78inline void* addr_from_java(jlong addr) { 79 // This assert fails in a variety of ways on 32-bit systems. 80 // It is impossible to predict whether native code that converts 81 // pointers to longs will sign-extend or zero-extend the addresses. 82 //assert(addr == (uintptr_t)addr, "must not be odd high bits"); 83 return (void*)(uintptr_t)addr; 84} 85 86inline jlong addr_to_java(void* p) { 87 assert(p == (void*)(uintptr_t)p, "must not be odd high bits"); 88 return (uintptr_t)p; 89} 90 91 92// Note: The VM's obj_field and related accessors use byte-scaled 93// ("unscaled") offsets, just as the unsafe methods do. 94 95// However, the method Unsafe.fieldOffset explicitly declines to 96// guarantee this. The field offset values manipulated by the Java user 97// through the Unsafe API are opaque cookies that just happen to be byte 98// offsets. We represent this state of affairs by passing the cookies 99// through conversion functions when going between the VM and the Unsafe API. 100// The conversion functions just happen to be no-ops at present. 101 102inline jlong field_offset_to_byte_offset(jlong field_offset) { 103 return field_offset; 104} 105 106inline jlong field_offset_from_byte_offset(jlong byte_offset) { 107 return byte_offset; 108} 109 110inline jint invocation_key_from_method_slot(jint slot) { 111 return slot; 112} 113 114inline jint invocation_key_to_method_slot(jint key) { 115 return key; 116} 117 118inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) { 119 jlong byte_offset = field_offset_to_byte_offset(field_offset); 120#ifdef ASSERT 121 if (p != NULL) { 122 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset"); 123 if (byte_offset == (jint)byte_offset) { 124 void* ptr_plus_disp = (address)p + byte_offset; 125 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp, 126 "raw [ptr+disp] must be consistent with oop::field_base"); 127 } 128 jlong p_size = HeapWordSize * (jlong)(p->size()); 129 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size)); 130 } 131#endif 132 if (sizeof(char*) == sizeof(jint)) // (this constant folds!) 133 return (address)p + (jint) byte_offset; 134 else 135 return (address)p + byte_offset; 136} 137 138// Externally callable versions: 139// (Use these in compiler intrinsics which emulate unsafe primitives.) 140jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) { 141 return field_offset; 142} 143jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) { 144 return byte_offset; 145} 146jint Unsafe_invocation_key_from_method_slot(jint slot) { 147 return invocation_key_from_method_slot(slot); 148} 149jint Unsafe_invocation_key_to_method_slot(jint key) { 150 return invocation_key_to_method_slot(key); 151} 152 153 154///// Data in the Java heap. 155 156#define GET_FIELD(obj, offset, type_name, v) \ 157 oop p = JNIHandles::resolve(obj); \ 158 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset) 159 160#define SET_FIELD(obj, offset, type_name, x) \ 161 oop p = JNIHandles::resolve(obj); \ 162 *(type_name*)index_oop_from_field_offset_long(p, offset) = x 163 164#define GET_FIELD_VOLATILE(obj, offset, type_name, v) \ 165 oop p = JNIHandles::resolve(obj); \ 166 if (support_IRIW_for_not_multiple_copy_atomic_cpu) { \ 167 OrderAccess::fence(); \ 168 } \ 169 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset)); 170 171#define SET_FIELD_VOLATILE(obj, offset, type_name, x) \ 172 oop p = JNIHandles::resolve(obj); \ 173 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x); 174 175// Macros for oops that check UseCompressedOops 176 177#define GET_OOP_FIELD(obj, offset, v) \ 178 oop p = JNIHandles::resolve(obj); \ 179 oop v; \ 180 if (UseCompressedOops) { \ 181 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \ 182 v = oopDesc::decode_heap_oop(n); \ 183 } else { \ 184 v = *(oop*)index_oop_from_field_offset_long(p, offset); \ 185 } 186 187 188// Get/SetObject must be special-cased, since it works with handles. 189 190// These functions allow a null base pointer with an arbitrary address. 191// But if the base pointer is non-null, the offset should make some sense. 192// That is, it should be in the range [0, MAX_OBJECT_SIZE]. 193UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 194 UnsafeWrapper("Unsafe_GetObject"); 195 GET_OOP_FIELD(obj, offset, v) 196 jobject ret = JNIHandles::make_local(env, v); 197#if INCLUDE_ALL_GCS 198 // We could be accessing the referent field in a reference 199 // object. If G1 is enabled then we need to register non-null 200 // referent with the SATB barrier. 201 if (UseG1GC) { 202 bool needs_barrier = false; 203 204 if (ret != NULL) { 205 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) { 206 oop o = JNIHandles::resolve(obj); 207 Klass* k = o->klass(); 208 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) { 209 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity"); 210 needs_barrier = true; 211 } 212 } 213 } 214 215 if (needs_barrier) { 216 oop referent = JNIHandles::resolve(ret); 217 G1SATBCardTableModRefBS::enqueue(referent); 218 } 219 } 220#endif // INCLUDE_ALL_GCS 221 return ret; 222UNSAFE_END 223 224UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 225 UnsafeWrapper("Unsafe_SetObject"); 226 oop x = JNIHandles::resolve(x_h); 227 oop p = JNIHandles::resolve(obj); 228 if (UseCompressedOops) { 229 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 230 } else { 231 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 232 } 233UNSAFE_END 234 235UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 236 UnsafeWrapper("Unsafe_GetObjectVolatile"); 237 oop p = JNIHandles::resolve(obj); 238 void* addr = index_oop_from_field_offset_long(p, offset); 239 volatile oop v; 240 if (UseCompressedOops) { 241 volatile narrowOop n = *(volatile narrowOop*) addr; 242 (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n)); 243 } else { 244 (void)const_cast<oop&>(v = *(volatile oop*) addr); 245 } 246 OrderAccess::acquire(); 247 return JNIHandles::make_local(env, v); 248UNSAFE_END 249 250UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 251 UnsafeWrapper("Unsafe_SetObjectVolatile"); 252 oop x = JNIHandles::resolve(x_h); 253 oop p = JNIHandles::resolve(obj); 254 void* addr = index_oop_from_field_offset_long(p, offset); 255 OrderAccess::release(); 256 if (UseCompressedOops) { 257 oop_store((narrowOop*)addr, x); 258 } else { 259 oop_store((oop*)addr, x); 260 } 261 OrderAccess::fence(); 262UNSAFE_END 263 264#ifndef SUPPORTS_NATIVE_CX8 265// Keep old code for platforms which may not have atomic jlong (8 bytes) instructions 266 267// Volatile long versions must use locks if !VM_Version::supports_cx8(). 268// support_cx8 is a surrogate for 'supports atomic long memory ops'. 269 270UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 271 UnsafeWrapper("Unsafe_GetLongVolatile"); 272 { 273 if (VM_Version::supports_cx8()) { 274 GET_FIELD_VOLATILE(obj, offset, jlong, v); 275 return v; 276 } 277 else { 278 Handle p (THREAD, JNIHandles::resolve(obj)); 279 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 280 ObjectLocker ol(p, THREAD); 281 jlong value = *addr; 282 return value; 283 } 284 } 285UNSAFE_END 286 287UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) 288 UnsafeWrapper("Unsafe_SetLongVolatile"); 289 { 290 if (VM_Version::supports_cx8()) { 291 SET_FIELD_VOLATILE(obj, offset, jlong, x); 292 } 293 else { 294 Handle p (THREAD, JNIHandles::resolve(obj)); 295 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 296 ObjectLocker ol(p, THREAD); 297 *addr = x; 298 } 299 } 300UNSAFE_END 301 302#endif // not SUPPORTS_NATIVE_CX8 303 304#define DEFINE_GETSETOOP(jboolean, Boolean) \ 305 \ 306UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \ 307 UnsafeWrapper("Unsafe_Get"#Boolean); \ 308 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \ 309 GET_FIELD(obj, offset, jboolean, v); \ 310 return v; \ 311UNSAFE_END \ 312 \ 313UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \ 314 UnsafeWrapper("Unsafe_Set"#Boolean); \ 315 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \ 316 SET_FIELD(obj, offset, jboolean, x); \ 317UNSAFE_END \ 318 \ 319UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \ 320 UnsafeWrapper("Unsafe_Get"#Boolean); \ 321 GET_FIELD(obj, offset, jboolean, v); \ 322 return v; \ 323UNSAFE_END \ 324 \ 325UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \ 326 UnsafeWrapper("Unsafe_Set"#Boolean); \ 327 SET_FIELD(obj, offset, jboolean, x); \ 328UNSAFE_END \ 329 \ 330// END DEFINE_GETSETOOP. 331 332DEFINE_GETSETOOP(jboolean, Boolean) 333DEFINE_GETSETOOP(jbyte, Byte) 334DEFINE_GETSETOOP(jshort, Short); 335DEFINE_GETSETOOP(jchar, Char); 336DEFINE_GETSETOOP(jint, Int); 337DEFINE_GETSETOOP(jlong, Long); 338DEFINE_GETSETOOP(jfloat, Float); 339DEFINE_GETSETOOP(jdouble, Double); 340 341#undef DEFINE_GETSETOOP 342 343#define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \ 344 \ 345UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \ 346 UnsafeWrapper("Unsafe_Get"#Boolean); \ 347 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \ 348 return v; \ 349UNSAFE_END \ 350 \ 351UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \ 352 UnsafeWrapper("Unsafe_Set"#Boolean); \ 353 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \ 354UNSAFE_END \ 355 \ 356// END DEFINE_GETSETOOP_VOLATILE. 357 358DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) 359DEFINE_GETSETOOP_VOLATILE(jbyte, Byte) 360DEFINE_GETSETOOP_VOLATILE(jshort, Short); 361DEFINE_GETSETOOP_VOLATILE(jchar, Char); 362DEFINE_GETSETOOP_VOLATILE(jint, Int); 363DEFINE_GETSETOOP_VOLATILE(jfloat, Float); 364DEFINE_GETSETOOP_VOLATILE(jdouble, Double); 365 366#ifdef SUPPORTS_NATIVE_CX8 367DEFINE_GETSETOOP_VOLATILE(jlong, Long); 368#endif 369 370#undef DEFINE_GETSETOOP_VOLATILE 371 372// The non-intrinsified versions of setOrdered just use setVolatile 373 374UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x)) 375 UnsafeWrapper("Unsafe_SetOrderedInt"); 376 SET_FIELD_VOLATILE(obj, offset, jint, x); 377UNSAFE_END 378 379UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 380 UnsafeWrapper("Unsafe_SetOrderedObject"); 381 oop x = JNIHandles::resolve(x_h); 382 oop p = JNIHandles::resolve(obj); 383 void* addr = index_oop_from_field_offset_long(p, offset); 384 OrderAccess::release(); 385 if (UseCompressedOops) { 386 oop_store((narrowOop*)addr, x); 387 } else { 388 oop_store((oop*)addr, x); 389 } 390 OrderAccess::fence(); 391UNSAFE_END 392 393UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) 394 UnsafeWrapper("Unsafe_SetOrderedLong"); 395#ifdef SUPPORTS_NATIVE_CX8 396 SET_FIELD_VOLATILE(obj, offset, jlong, x); 397#else 398 // Keep old code for platforms which may not have atomic long (8 bytes) instructions 399 { 400 if (VM_Version::supports_cx8()) { 401 SET_FIELD_VOLATILE(obj, offset, jlong, x); 402 } 403 else { 404 Handle p (THREAD, JNIHandles::resolve(obj)); 405 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 406 ObjectLocker ol(p, THREAD); 407 *addr = x; 408 } 409 } 410#endif 411UNSAFE_END 412 413UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe)) 414 UnsafeWrapper("Unsafe_LoadFence"); 415 OrderAccess::acquire(); 416UNSAFE_END 417 418UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe)) 419 UnsafeWrapper("Unsafe_StoreFence"); 420 OrderAccess::release(); 421UNSAFE_END 422 423UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe)) 424 UnsafeWrapper("Unsafe_FullFence"); 425 OrderAccess::fence(); 426UNSAFE_END 427 428////// Data in the C heap. 429 430// Note: These do not throw NullPointerException for bad pointers. 431// They just crash. Only a oop base pointer can generate a NullPointerException. 432// 433#define DEFINE_GETSETNATIVE(java_type, Type, native_type) \ 434 \ 435UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \ 436 UnsafeWrapper("Unsafe_GetNative"#Type); \ 437 void* p = addr_from_java(addr); \ 438 JavaThread* t = JavaThread::current(); \ 439 t->set_doing_unsafe_access(true); \ 440 java_type x = *(volatile native_type*)p; \ 441 t->set_doing_unsafe_access(false); \ 442 return x; \ 443UNSAFE_END \ 444 \ 445UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \ 446 UnsafeWrapper("Unsafe_SetNative"#Type); \ 447 JavaThread* t = JavaThread::current(); \ 448 t->set_doing_unsafe_access(true); \ 449 void* p = addr_from_java(addr); \ 450 *(volatile native_type*)p = x; \ 451 t->set_doing_unsafe_access(false); \ 452UNSAFE_END \ 453 \ 454// END DEFINE_GETSETNATIVE. 455 456DEFINE_GETSETNATIVE(jbyte, Byte, signed char) 457DEFINE_GETSETNATIVE(jshort, Short, signed short); 458DEFINE_GETSETNATIVE(jchar, Char, unsigned short); 459DEFINE_GETSETNATIVE(jint, Int, jint); 460// no long -- handled specially 461DEFINE_GETSETNATIVE(jfloat, Float, float); 462DEFINE_GETSETNATIVE(jdouble, Double, double); 463 464#undef DEFINE_GETSETNATIVE 465 466UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr)) 467 UnsafeWrapper("Unsafe_GetNativeLong"); 468 JavaThread* t = JavaThread::current(); 469 // We do it this way to avoid problems with access to heap using 64 470 // bit loads, as jlong in heap could be not 64-bit aligned, and on 471 // some CPUs (SPARC) it leads to SIGBUS. 472 t->set_doing_unsafe_access(true); 473 void* p = addr_from_java(addr); 474 jlong x; 475 if (((intptr_t)p & 7) == 0) { 476 // jlong is aligned, do a volatile access 477 x = *(volatile jlong*)p; 478 } else { 479 jlong_accessor acc; 480 acc.words[0] = ((volatile jint*)p)[0]; 481 acc.words[1] = ((volatile jint*)p)[1]; 482 x = acc.long_value; 483 } 484 t->set_doing_unsafe_access(false); 485 return x; 486UNSAFE_END 487 488UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 489 UnsafeWrapper("Unsafe_SetNativeLong"); 490 JavaThread* t = JavaThread::current(); 491 // see comment for Unsafe_GetNativeLong 492 t->set_doing_unsafe_access(true); 493 void* p = addr_from_java(addr); 494 if (((intptr_t)p & 7) == 0) { 495 // jlong is aligned, do a volatile access 496 *(volatile jlong*)p = x; 497 } else { 498 jlong_accessor acc; 499 acc.long_value = x; 500 ((volatile jint*)p)[0] = acc.words[0]; 501 ((volatile jint*)p)[1] = acc.words[1]; 502 } 503 t->set_doing_unsafe_access(false); 504UNSAFE_END 505 506 507UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr)) 508 UnsafeWrapper("Unsafe_GetNativeAddress"); 509 void* p = addr_from_java(addr); 510 return addr_to_java(*(void**)p); 511UNSAFE_END 512 513UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 514 UnsafeWrapper("Unsafe_SetNativeAddress"); 515 void* p = addr_from_java(addr); 516 *(void**)p = addr_from_java(x); 517UNSAFE_END 518 519 520////// Allocation requests 521 522UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls)) 523 UnsafeWrapper("Unsafe_AllocateInstance"); 524 { 525 ThreadToNativeFromVM ttnfv(thread); 526 return env->AllocObject(cls); 527 } 528UNSAFE_END 529 530UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size)) 531 UnsafeWrapper("Unsafe_AllocateMemory"); 532 size_t sz = (size_t)size; 533 if (sz != (julong)size || size < 0) { 534 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 535 } 536 if (sz == 0) { 537 return 0; 538 } 539 sz = round_to(sz, HeapWordSize); 540 void* x = os::malloc(sz, mtInternal); 541 if (x == NULL) { 542 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 543 } 544 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize); 545 return addr_to_java(x); 546UNSAFE_END 547 548UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size)) 549 UnsafeWrapper("Unsafe_ReallocateMemory"); 550 void* p = addr_from_java(addr); 551 size_t sz = (size_t)size; 552 if (sz != (julong)size || size < 0) { 553 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 554 } 555 if (sz == 0) { 556 os::free(p); 557 return 0; 558 } 559 sz = round_to(sz, HeapWordSize); 560 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal); 561 if (x == NULL) { 562 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 563 } 564 return addr_to_java(x); 565UNSAFE_END 566 567UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr)) 568 UnsafeWrapper("Unsafe_FreeMemory"); 569 void* p = addr_from_java(addr); 570 if (p == NULL) { 571 return; 572 } 573 os::free(p); 574UNSAFE_END 575 576UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value)) 577 UnsafeWrapper("Unsafe_SetMemory"); 578 size_t sz = (size_t)size; 579 if (sz != (julong)size || size < 0) { 580 THROW(vmSymbols::java_lang_IllegalArgumentException()); 581 } 582 char* p = (char*) addr_from_java(addr); 583 Copy::fill_to_memory_atomic(p, sz, value); 584UNSAFE_END 585 586UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value)) 587 UnsafeWrapper("Unsafe_SetMemory"); 588 size_t sz = (size_t)size; 589 if (sz != (julong)size || size < 0) { 590 THROW(vmSymbols::java_lang_IllegalArgumentException()); 591 } 592 oop base = JNIHandles::resolve(obj); 593 void* p = index_oop_from_field_offset_long(base, offset); 594 Copy::fill_to_memory_atomic(p, sz, value); 595UNSAFE_END 596 597UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size)) 598 UnsafeWrapper("Unsafe_CopyMemory"); 599 if (size == 0) { 600 return; 601 } 602 size_t sz = (size_t)size; 603 if (sz != (julong)size || size < 0) { 604 THROW(vmSymbols::java_lang_IllegalArgumentException()); 605 } 606 void* src = addr_from_java(srcAddr); 607 void* dst = addr_from_java(dstAddr); 608 Copy::conjoint_memory_atomic(src, dst, sz); 609UNSAFE_END 610 611UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size)) 612 UnsafeWrapper("Unsafe_CopyMemory"); 613 if (size == 0) { 614 return; 615 } 616 size_t sz = (size_t)size; 617 if (sz != (julong)size || size < 0) { 618 THROW(vmSymbols::java_lang_IllegalArgumentException()); 619 } 620 oop srcp = JNIHandles::resolve(srcObj); 621 oop dstp = JNIHandles::resolve(dstObj); 622 if (dstp != NULL && !dstp->is_typeArray()) { 623 // NYI: This works only for non-oop arrays at present. 624 // Generalizing it would be reasonable, but requires card marking. 625 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad. 626 THROW(vmSymbols::java_lang_IllegalArgumentException()); 627 } 628 void* src = index_oop_from_field_offset_long(srcp, srcOffset); 629 void* dst = index_oop_from_field_offset_long(dstp, dstOffset); 630 Copy::conjoint_memory_atomic(src, dst, sz); 631UNSAFE_END 632 633 634////// Random queries 635 636// See comment at file start about UNSAFE_LEAF 637//UNSAFE_LEAF(jint, Unsafe_AddressSize()) 638UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe)) 639 UnsafeWrapper("Unsafe_AddressSize"); 640 return sizeof(void*); 641UNSAFE_END 642 643// See comment at file start about UNSAFE_LEAF 644//UNSAFE_LEAF(jint, Unsafe_PageSize()) 645UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe)) 646 UnsafeWrapper("Unsafe_PageSize"); 647 return os::vm_page_size(); 648UNSAFE_END 649 650jint find_field_offset(jobject field, int must_be_static, TRAPS) { 651 if (field == NULL) { 652 THROW_0(vmSymbols::java_lang_NullPointerException()); 653 } 654 655 oop reflected = JNIHandles::resolve_non_null(field); 656 oop mirror = java_lang_reflect_Field::clazz(reflected); 657 Klass* k = java_lang_Class::as_Klass(mirror); 658 int slot = java_lang_reflect_Field::slot(reflected); 659 int modifiers = java_lang_reflect_Field::modifiers(reflected); 660 661 if (must_be_static >= 0) { 662 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0); 663 if (must_be_static != really_is_static) { 664 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 665 } 666 } 667 668 int offset = InstanceKlass::cast(k)->field_offset(slot); 669 return field_offset_from_byte_offset(offset); 670} 671 672UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 673 UnsafeWrapper("Unsafe_ObjectFieldOffset"); 674 return find_field_offset(field, 0, THREAD); 675UNSAFE_END 676 677UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 678 UnsafeWrapper("Unsafe_StaticFieldOffset"); 679 return find_field_offset(field, 1, THREAD); 680UNSAFE_END 681 682UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field)) 683 UnsafeWrapper("Unsafe_StaticFieldBase"); 684 // Note: In this VM implementation, a field address is always a short 685 // offset from the base of a a klass metaobject. Thus, the full dynamic 686 // range of the return type is never used. However, some implementations 687 // might put the static field inside an array shared by many classes, 688 // or even at a fixed address, in which case the address could be quite 689 // large. In that last case, this function would return NULL, since 690 // the address would operate alone, without any base pointer. 691 692 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); 693 694 oop reflected = JNIHandles::resolve_non_null(field); 695 oop mirror = java_lang_reflect_Field::clazz(reflected); 696 int modifiers = java_lang_reflect_Field::modifiers(reflected); 697 698 if ((modifiers & JVM_ACC_STATIC) == 0) { 699 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 700 } 701 702 return JNIHandles::make_local(env, mirror); 703UNSAFE_END 704 705//@deprecated 706UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 707 UnsafeWrapper("Unsafe_FieldOffset"); 708 // tries (but fails) to be polymorphic between static and non-static: 709 jlong offset = find_field_offset(field, -1, THREAD); 710 guarantee(offset == (jint)offset, "offset fits in 32 bits"); 711 return (jint)offset; 712UNSAFE_END 713 714//@deprecated 715UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz)) 716 UnsafeWrapper("Unsafe_StaticFieldBase"); 717 if (clazz == NULL) { 718 THROW_0(vmSymbols::java_lang_NullPointerException()); 719 } 720 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz)); 721UNSAFE_END 722 723UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) { 724 UnsafeWrapper("Unsafe_EnsureClassInitialized"); 725 if (clazz == NULL) { 726 THROW(vmSymbols::java_lang_NullPointerException()); 727 } 728 oop mirror = JNIHandles::resolve_non_null(clazz); 729 730 Klass* klass = java_lang_Class::as_Klass(mirror); 731 if (klass != NULL && klass->should_be_initialized()) { 732 InstanceKlass* k = InstanceKlass::cast(klass); 733 k->initialize(CHECK); 734 } 735} 736UNSAFE_END 737 738UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) { 739 UnsafeWrapper("Unsafe_ShouldBeInitialized"); 740 if (clazz == NULL) { 741 THROW_(vmSymbols::java_lang_NullPointerException(), false); 742 } 743 oop mirror = JNIHandles::resolve_non_null(clazz); 744 Klass* klass = java_lang_Class::as_Klass(mirror); 745 if (klass != NULL && klass->should_be_initialized()) { 746 return true; 747 } 748 return false; 749} 750UNSAFE_END 751 752static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) { 753 if (acls == NULL) { 754 THROW(vmSymbols::java_lang_NullPointerException()); 755 } 756 oop mirror = JNIHandles::resolve_non_null(acls); 757 Klass* k = java_lang_Class::as_Klass(mirror); 758 if (k == NULL || !k->oop_is_array()) { 759 THROW(vmSymbols::java_lang_InvalidClassException()); 760 } else if (k->oop_is_objArray()) { 761 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT); 762 scale = heapOopSize; 763 } else if (k->oop_is_typeArray()) { 764 TypeArrayKlass* tak = TypeArrayKlass::cast(k); 765 base = tak->array_header_in_bytes(); 766 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok"); 767 scale = (1 << tak->log2_element_size()); 768 } else { 769 ShouldNotReachHere(); 770 } 771} 772 773UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls)) 774 UnsafeWrapper("Unsafe_ArrayBaseOffset"); 775 int base, scale; 776 getBaseAndScale(base, scale, acls, CHECK_0); 777 return field_offset_from_byte_offset(base); 778UNSAFE_END 779 780 781UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls)) 782 UnsafeWrapper("Unsafe_ArrayIndexScale"); 783 int base, scale; 784 getBaseAndScale(base, scale, acls, CHECK_0); 785 // This VM packs both fields and array elements down to the byte. 786 // But watch out: If this changes, so that array references for 787 // a given primitive type (say, T_BOOLEAN) use different memory units 788 // than fields, this method MUST return zero for such arrays. 789 // For example, the VM used to store sub-word sized fields in full 790 // words in the object layout, so that accessors like getByte(Object,int) 791 // did not really do what one might expect for arrays. Therefore, 792 // this function used to report a zero scale factor, so that the user 793 // would know not to attempt to access sub-word array elements. 794 // // Code for unpacked fields: 795 // if (scale < wordSize) return 0; 796 797 // The following allows for a pretty general fieldOffset cookie scheme, 798 // but requires it to be linear in byte offset. 799 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0); 800UNSAFE_END 801 802 803static inline void throw_new(JNIEnv *env, const char *ename) { 804 char buf[100]; 805 jio_snprintf(buf, 100, "%s%s", "java/lang/", ename); 806 jclass cls = env->FindClass(buf); 807 if (env->ExceptionCheck()) { 808 env->ExceptionClear(); 809 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf); 810 return; 811 } 812 char* msg = NULL; 813 env->ThrowNew(cls, msg); 814} 815 816static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) { 817 { 818 // Code lifted from JDK 1.3 ClassLoader.c 819 820 jbyte *body; 821 char *utfName; 822 jclass result = 0; 823 char buf[128]; 824 825 if (UsePerfData) { 826 ClassLoader::unsafe_defineClassCallCounter()->inc(); 827 } 828 829 if (data == NULL) { 830 throw_new(env, "NullPointerException"); 831 return 0; 832 } 833 834 /* Work around 4153825. malloc crashes on Solaris when passed a 835 * negative size. 836 */ 837 if (length < 0) { 838 throw_new(env, "ArrayIndexOutOfBoundsException"); 839 return 0; 840 } 841 842 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal); 843 844 if (body == 0) { 845 throw_new(env, "OutOfMemoryError"); 846 return 0; 847 } 848 849 env->GetByteArrayRegion(data, offset, length, body); 850 851 if (env->ExceptionOccurred()) 852 goto free_body; 853 854 if (name != NULL) { 855 uint len = env->GetStringUTFLength(name); 856 int unicode_len = env->GetStringLength(name); 857 if (len >= sizeof(buf)) { 858 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 859 if (utfName == NULL) { 860 throw_new(env, "OutOfMemoryError"); 861 goto free_body; 862 } 863 } else { 864 utfName = buf; 865 } 866 env->GetStringUTFRegion(name, 0, unicode_len, utfName); 867 //VerifyFixClassname(utfName); 868 for (uint i = 0; i < len; i++) { 869 if (utfName[i] == '.') utfName[i] = '/'; 870 } 871 } else { 872 utfName = NULL; 873 } 874 875 result = JVM_DefineClass(env, utfName, loader, body, length, pd); 876 877 if (utfName && utfName != buf) 878 FREE_C_HEAP_ARRAY(char, utfName, mtInternal); 879 880 free_body: 881 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal); 882 return result; 883 } 884} 885 886 887UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd)) 888 UnsafeWrapper("Unsafe_DefineClass"); 889 { 890 ThreadToNativeFromVM ttnfv(thread); 891 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd); 892 } 893UNSAFE_END 894 895static jobject get_class_loader(JNIEnv* env, jclass cls) { 896 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) { 897 return NULL; 898 } 899 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls)); 900 oop loader = k->class_loader(); 901 return JNIHandles::make_local(env, loader); 902} 903 904UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length)) 905 UnsafeWrapper("Unsafe_DefineClass"); 906 { 907 ThreadToNativeFromVM ttnfv(thread); 908 909 int depthFromDefineClass0 = 1; 910 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0); 911 jobject loader = (caller == NULL) ? NULL : get_class_loader(env, caller); 912 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller); 913 914 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd); 915 } 916UNSAFE_END 917 918 919#define DAC_Args CLS"[B["OBJ 920// define a class but do not make it known to the class loader or system dictionary 921// - host_class: supplies context for linkage, access control, protection domain, and class loader 922// - data: bytes of a class file, a raw memory address (length gives the number of bytes) 923// - cp_patches: where non-null entries exist, they replace corresponding CP entries in data 924 925// When you load an anonymous class U, it works as if you changed its name just before loading, 926// to a name that you will never use again. Since the name is lost, no other class can directly 927// link to any member of U. Just after U is loaded, the only way to use it is reflectively, 928// through java.lang.Class methods like Class.newInstance. 929 930// Access checks for linkage sites within U continue to follow the same rules as for named classes. 931// The package of an anonymous class is given by the package qualifier on the name under which it was loaded. 932// An anonymous class also has special privileges to access any member of its host class. 933// This is the main reason why this loading operation is unsafe. The purpose of this is to 934// allow language implementations to simulate "open classes"; a host class in effect gets 935// new code when an anonymous class is loaded alongside it. A less convenient but more 936// standard way to do this is with reflection, which can also be set to ignore access 937// restrictions. 938 939// Access into an anonymous class is possible only through reflection. Therefore, there 940// are no special access rules for calling into an anonymous class. The relaxed access 941// rule for the host class is applied in the opposite direction: A host class reflectively 942// access one of its anonymous classes. 943 944// If you load the same bytecodes twice, you get two different classes. You can reload 945// the same bytecodes with or without varying CP patches. 946 947// By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1. 948// The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is). 949// The CONSTANT_Class entry for that name can be patched to refer directly to U1. 950 951// This allows, for example, U2 to use U1 as a superclass or super-interface, or as 952// an outer class (so that U2 is an anonymous inner class of anonymous U1). 953// It is not possible for a named class, or an older anonymous class, to refer by 954// name (via its CP) to a newer anonymous class. 955 956// CP patching may also be used to modify (i.e., hack) the names of methods, classes, 957// or type descriptors used in the loaded anonymous class. 958 959// Finally, CP patching may be used to introduce "live" objects into the constant pool, 960// instead of "dead" strings. A compiled statement like println((Object)"hello") can 961// be changed to println(greeting), where greeting is an arbitrary object created before 962// the anonymous class is loaded. This is useful in dynamic languages, in which 963// various kinds of metaobjects must be introduced as constants into bytecode. 964// Note the cast (Object), which tells the verifier to expect an arbitrary object, 965// not just a literal string. For such ldc instructions, the verifier uses the 966// type Object instead of String, if the loaded constant is not in fact a String. 967 968static instanceKlassHandle 969Unsafe_DefineAnonymousClass_impl(JNIEnv *env, 970 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh, 971 HeapWord* *temp_alloc, 972 TRAPS) { 973 974 if (UsePerfData) { 975 ClassLoader::unsafe_defineClassCallCounter()->inc(); 976 } 977 978 if (data == NULL) { 979 THROW_0(vmSymbols::java_lang_NullPointerException()); 980 } 981 982 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length(); 983 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord); 984 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal); 985 if (body == NULL) { 986 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 987 } 988 989 // caller responsible to free it: 990 (*temp_alloc) = body; 991 992 { 993 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0); 994 Copy::conjoint_words((HeapWord*) array_base, body, word_length); 995 } 996 997 u1* class_bytes = (u1*) body; 998 int class_bytes_length = (int) length; 999 if (class_bytes_length < 0) class_bytes_length = 0; 1000 if (class_bytes == NULL 1001 || host_class == NULL 1002 || length != class_bytes_length) 1003 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 1004 1005 objArrayHandle cp_patches_h; 1006 if (cp_patches_jh != NULL) { 1007 oop p = JNIHandles::resolve_non_null(cp_patches_jh); 1008 if (!p->is_objArray()) 1009 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 1010 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p); 1011 } 1012 1013 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class))); 1014 const char* host_source = host_klass->external_name(); 1015 Handle host_loader(THREAD, host_klass->class_loader()); 1016 Handle host_domain(THREAD, host_klass->protection_domain()); 1017 1018 GrowableArray<Handle>* cp_patches = NULL; 1019 if (cp_patches_h.not_null()) { 1020 int alen = cp_patches_h->length(); 1021 for (int i = alen-1; i >= 0; i--) { 1022 oop p = cp_patches_h->obj_at(i); 1023 if (p != NULL) { 1024 Handle patch(THREAD, p); 1025 if (cp_patches == NULL) 1026 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle()); 1027 cp_patches->at_put(i, patch); 1028 } 1029 } 1030 } 1031 1032 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source); 1033 1034 instanceKlassHandle anon_klass; 1035 { 1036 Symbol* no_class_name = NULL; 1037 Klass* anonk = SystemDictionary::parse_stream(no_class_name, 1038 host_loader, host_domain, 1039 &st, host_klass, cp_patches, 1040 CHECK_NULL); 1041 if (anonk == NULL) return NULL; 1042 anon_klass = instanceKlassHandle(THREAD, anonk); 1043 } 1044 1045 return anon_klass; 1046} 1047 1048UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh)) 1049{ 1050 instanceKlassHandle anon_klass; 1051 jobject res_jh = NULL; 1052 1053 UnsafeWrapper("Unsafe_DefineAnonymousClass"); 1054 ResourceMark rm(THREAD); 1055 1056 HeapWord* temp_alloc = NULL; 1057 1058 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data, 1059 cp_patches_jh, 1060 &temp_alloc, THREAD); 1061 if (anon_klass() != NULL) 1062 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror()); 1063 1064 // try/finally clause: 1065 if (temp_alloc != NULL) { 1066 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal); 1067 } 1068 1069 // The anonymous class loader data has been artificially been kept alive to 1070 // this point. The mirror and any instances of this class have to keep 1071 // it alive afterwards. 1072 if (anon_klass() != NULL) { 1073 anon_klass->class_loader_data()->set_keep_alive(false); 1074 } 1075 1076 // let caller initialize it as needed... 1077 1078 return (jclass) res_jh; 1079} 1080UNSAFE_END 1081 1082 1083 1084UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 1085 UnsafeWrapper("Unsafe_MonitorEnter"); 1086 { 1087 if (jobj == NULL) { 1088 THROW(vmSymbols::java_lang_NullPointerException()); 1089 } 1090 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 1091 ObjectSynchronizer::jni_enter(obj, CHECK); 1092 } 1093UNSAFE_END 1094 1095 1096UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 1097 UnsafeWrapper("Unsafe_TryMonitorEnter"); 1098 { 1099 if (jobj == NULL) { 1100 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 1101 } 1102 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 1103 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0); 1104 return (res ? JNI_TRUE : JNI_FALSE); 1105 } 1106UNSAFE_END 1107 1108 1109UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj)) 1110 UnsafeWrapper("Unsafe_MonitorExit"); 1111 { 1112 if (jobj == NULL) { 1113 THROW(vmSymbols::java_lang_NullPointerException()); 1114 } 1115 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj)); 1116 ObjectSynchronizer::jni_exit(obj(), CHECK); 1117 } 1118UNSAFE_END 1119 1120 1121UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr)) 1122 UnsafeWrapper("Unsafe_ThrowException"); 1123 { 1124 ThreadToNativeFromVM ttnfv(thread); 1125 env->Throw(thr); 1126 } 1127UNSAFE_END 1128 1129// JSR166 ------------------------------------------------------------------ 1130 1131UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h)) 1132 UnsafeWrapper("Unsafe_CompareAndSwapObject"); 1133 oop x = JNIHandles::resolve(x_h); 1134 oop e = JNIHandles::resolve(e_h); 1135 oop p = JNIHandles::resolve(obj); 1136 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset); 1137 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true); 1138 jboolean success = (res == e); 1139 if (success) 1140 update_barrier_set((void*)addr, x); 1141 return success; 1142UNSAFE_END 1143 1144UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x)) 1145 UnsafeWrapper("Unsafe_CompareAndSwapInt"); 1146 oop p = JNIHandles::resolve(obj); 1147 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset); 1148 return (jint)(Atomic::cmpxchg(x, addr, e)) == e; 1149UNSAFE_END 1150 1151UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x)) 1152 UnsafeWrapper("Unsafe_CompareAndSwapLong"); 1153 Handle p (THREAD, JNIHandles::resolve(obj)); 1154 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 1155 if (VM_Version::supports_cx8()) 1156 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e; 1157 else { 1158 jboolean success = false; 1159 ObjectLocker ol(p, THREAD); 1160 if (*addr == e) { *addr = x; success = true; } 1161 return success; 1162 } 1163UNSAFE_END 1164 1165UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time)) 1166 UnsafeWrapper("Unsafe_Park"); 1167 EventThreadPark event; 1168 HOTSPOT_THREAD_PARK_BEGIN((uintptr_t) thread->parker(), (int) isAbsolute, time); 1169 1170 JavaThreadParkedState jtps(thread, time != 0); 1171 thread->parker()->park(isAbsolute != 0, time); 1172 1173 HOTSPOT_THREAD_PARK_END((uintptr_t) thread->parker()); 1174 if (event.should_commit()) { 1175 oop obj = thread->current_park_blocker(); 1176 event.set_klass((obj != NULL) ? obj->klass() : NULL); 1177 event.set_timeout(time); 1178 event.set_address((obj != NULL) ? (TYPE_ADDRESS) cast_from_oop<uintptr_t>(obj) : 0); 1179 event.commit(); 1180 } 1181UNSAFE_END 1182 1183UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread)) 1184 UnsafeWrapper("Unsafe_Unpark"); 1185 Parker* p = NULL; 1186 if (jthread != NULL) { 1187 oop java_thread = JNIHandles::resolve_non_null(jthread); 1188 if (java_thread != NULL) { 1189 jlong lp = java_lang_Thread::park_event(java_thread); 1190 if (lp != 0) { 1191 // This cast is OK even though the jlong might have been read 1192 // non-atomically on 32bit systems, since there, one word will 1193 // always be zero anyway and the value set is always the same 1194 p = (Parker*)addr_from_java(lp); 1195 } else { 1196 // Grab lock if apparently null or using older version of library 1197 MutexLocker mu(Threads_lock); 1198 java_thread = JNIHandles::resolve_non_null(jthread); 1199 if (java_thread != NULL) { 1200 JavaThread* thr = java_lang_Thread::thread(java_thread); 1201 if (thr != NULL) { 1202 p = thr->parker(); 1203 if (p != NULL) { // Bind to Java thread for next time. 1204 java_lang_Thread::set_park_event(java_thread, addr_to_java(p)); 1205 } 1206 } 1207 } 1208 } 1209 } 1210 } 1211 if (p != NULL) { 1212 HOTSPOT_THREAD_UNPARK((uintptr_t) p); 1213 p->unpark(); 1214 } 1215UNSAFE_END 1216 1217UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem)) 1218 UnsafeWrapper("Unsafe_Loadavg"); 1219 const int max_nelem = 3; 1220 double la[max_nelem]; 1221 jint ret; 1222 1223 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg)); 1224 assert(a->is_typeArray(), "must be type array"); 1225 1226 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) { 1227 ThreadToNativeFromVM ttnfv(thread); 1228 throw_new(env, "ArrayIndexOutOfBoundsException"); 1229 return -1; 1230 } 1231 1232 ret = os::loadavg(la, nelem); 1233 if (ret == -1) return -1; 1234 1235 // if successful, ret is the number of samples actually retrieved. 1236 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value"); 1237 switch(ret) { 1238 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through 1239 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through 1240 case 1: a->double_at_put(0, (jdouble)la[0]); break; 1241 } 1242 return ret; 1243UNSAFE_END 1244 1245UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 1246 UnsafeWrapper("Unsafe_PrefetchRead"); 1247 oop p = JNIHandles::resolve(obj); 1248 void* addr = index_oop_from_field_offset_long(p, 0); 1249 Prefetch::read(addr, (intx)offset); 1250UNSAFE_END 1251 1252UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 1253 UnsafeWrapper("Unsafe_PrefetchWrite"); 1254 oop p = JNIHandles::resolve(obj); 1255 void* addr = index_oop_from_field_offset_long(p, 0); 1256 Prefetch::write(addr, (intx)offset); 1257UNSAFE_END 1258 1259 1260/// JVM_RegisterUnsafeMethods 1261 1262#define ADR "J" 1263 1264#define LANG "Ljava/lang/" 1265 1266#define OBJ LANG"Object;" 1267#define CLS LANG"Class;" 1268#define CTR LANG"reflect/Constructor;" 1269#define FLD LANG"reflect/Field;" 1270#define MTH LANG"reflect/Method;" 1271#define THR LANG"Throwable;" 1272 1273#define DC0_Args LANG"String;[BII" 1274#define DC_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;" 1275 1276#define CC (char*) /*cast a literal from (const char*)*/ 1277#define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1278 1279// define deprecated accessors for compabitility with 1.4.0 1280#define DECLARE_GETSETOOP_140(Boolean, Z) \ 1281 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \ 1282 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)} 1283 1284// Note: In 1.4.1, getObject and kin take both int and long offsets. 1285#define DECLARE_GETSETOOP_141(Boolean, Z) \ 1286 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1287 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)} 1288 1289// Note: In 1.5.0, there are volatile versions too 1290#define DECLARE_GETSETOOP(Boolean, Z) \ 1291 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1292 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \ 1293 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \ 1294 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)} 1295 1296 1297#define DECLARE_GETSETNATIVE(Byte, B) \ 1298 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \ 1299 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)} 1300 1301 1302 1303// These are the methods for 1.4.0 1304static JNINativeMethod methods_140[] = { 1305 DECLARE_GETSETOOP_140(Boolean, Z), 1306 DECLARE_GETSETOOP_140(Byte, B), 1307 DECLARE_GETSETOOP_140(Short, S), 1308 DECLARE_GETSETOOP_140(Char, C), 1309 DECLARE_GETSETOOP_140(Int, I), 1310 DECLARE_GETSETOOP_140(Long, J), 1311 DECLARE_GETSETOOP_140(Float, F), 1312 DECLARE_GETSETOOP_140(Double, D), 1313 1314 DECLARE_GETSETNATIVE(Byte, B), 1315 DECLARE_GETSETNATIVE(Short, S), 1316 DECLARE_GETSETNATIVE(Char, C), 1317 DECLARE_GETSETNATIVE(Int, I), 1318 DECLARE_GETSETNATIVE(Long, J), 1319 DECLARE_GETSETNATIVE(Float, F), 1320 DECLARE_GETSETNATIVE(Double, D), 1321 1322 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1323 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1324 1325 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1326 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1327 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1328 1329 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, 1330 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, 1331 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1332 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1333 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1334 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1335 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1336 1337 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1338 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1339 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1340 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1341 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1342 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)} 1343}; 1344 1345// These are the methods prior to the JSR 166 changes in 1.5.0 1346static JNINativeMethod methods_141[] = { 1347 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1348 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1349 1350 DECLARE_GETSETOOP_141(Boolean, Z), 1351 DECLARE_GETSETOOP_141(Byte, B), 1352 DECLARE_GETSETOOP_141(Short, S), 1353 DECLARE_GETSETOOP_141(Char, C), 1354 DECLARE_GETSETOOP_141(Int, I), 1355 DECLARE_GETSETOOP_141(Long, J), 1356 DECLARE_GETSETOOP_141(Float, F), 1357 DECLARE_GETSETOOP_141(Double, D), 1358 1359 DECLARE_GETSETNATIVE(Byte, B), 1360 DECLARE_GETSETNATIVE(Short, S), 1361 DECLARE_GETSETNATIVE(Char, C), 1362 DECLARE_GETSETNATIVE(Int, I), 1363 DECLARE_GETSETNATIVE(Long, J), 1364 DECLARE_GETSETNATIVE(Float, F), 1365 DECLARE_GETSETNATIVE(Double, D), 1366 1367 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1368 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1369 1370 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1371 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1372 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1373 1374 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1375 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1376 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1377 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1378 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1379 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1380 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1381 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1382 1383 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1384 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1385 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1386 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1387 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1388 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)} 1389 1390}; 1391 1392// These are the methods prior to the JSR 166 changes in 1.6.0 1393static JNINativeMethod methods_15[] = { 1394 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1395 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1396 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1397 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1398 1399 1400 DECLARE_GETSETOOP(Boolean, Z), 1401 DECLARE_GETSETOOP(Byte, B), 1402 DECLARE_GETSETOOP(Short, S), 1403 DECLARE_GETSETOOP(Char, C), 1404 DECLARE_GETSETOOP(Int, I), 1405 DECLARE_GETSETOOP(Long, J), 1406 DECLARE_GETSETOOP(Float, F), 1407 DECLARE_GETSETOOP(Double, D), 1408 1409 DECLARE_GETSETNATIVE(Byte, B), 1410 DECLARE_GETSETNATIVE(Short, S), 1411 DECLARE_GETSETNATIVE(Char, C), 1412 DECLARE_GETSETNATIVE(Int, I), 1413 DECLARE_GETSETNATIVE(Long, J), 1414 DECLARE_GETSETNATIVE(Float, F), 1415 DECLARE_GETSETNATIVE(Double, D), 1416 1417 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1418 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1419 1420 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1421 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1422 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1423 1424 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1425 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1426 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1427 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1428 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1429 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1430 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1431 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1432 1433 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1434 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1435 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1436 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1437 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1438 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1439 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1440 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1441 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1442 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1443 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1444 1445}; 1446 1447// These are the methods for 1.6.0 and 1.7.0 1448static JNINativeMethod methods_16[] = { 1449 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1450 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1451 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1452 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1453 1454 DECLARE_GETSETOOP(Boolean, Z), 1455 DECLARE_GETSETOOP(Byte, B), 1456 DECLARE_GETSETOOP(Short, S), 1457 DECLARE_GETSETOOP(Char, C), 1458 DECLARE_GETSETOOP(Int, I), 1459 DECLARE_GETSETOOP(Long, J), 1460 DECLARE_GETSETOOP(Float, F), 1461 DECLARE_GETSETOOP(Double, D), 1462 1463 DECLARE_GETSETNATIVE(Byte, B), 1464 DECLARE_GETSETNATIVE(Short, S), 1465 DECLARE_GETSETNATIVE(Char, C), 1466 DECLARE_GETSETNATIVE(Int, I), 1467 DECLARE_GETSETNATIVE(Long, J), 1468 DECLARE_GETSETNATIVE(Float, F), 1469 DECLARE_GETSETNATIVE(Double, D), 1470 1471 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1472 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1473 1474 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1475 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1476 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1477 1478 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1479 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1480 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1481 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1482 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1483 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1484 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1485 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1486 1487 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1488 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1489 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1490 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1491 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1492 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)}, 1493 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1494 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1495 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1496 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1497 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)}, 1498 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)}, 1499 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)}, 1500 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1501 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1502}; 1503 1504// These are the methods for 1.8.0 1505static JNINativeMethod methods_18[] = { 1506 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1507 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1508 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1509 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1510 1511 DECLARE_GETSETOOP(Boolean, Z), 1512 DECLARE_GETSETOOP(Byte, B), 1513 DECLARE_GETSETOOP(Short, S), 1514 DECLARE_GETSETOOP(Char, C), 1515 DECLARE_GETSETOOP(Int, I), 1516 DECLARE_GETSETOOP(Long, J), 1517 DECLARE_GETSETOOP(Float, F), 1518 DECLARE_GETSETOOP(Double, D), 1519 1520 DECLARE_GETSETNATIVE(Byte, B), 1521 DECLARE_GETSETNATIVE(Short, S), 1522 DECLARE_GETSETNATIVE(Char, C), 1523 DECLARE_GETSETNATIVE(Int, I), 1524 DECLARE_GETSETNATIVE(Long, J), 1525 DECLARE_GETSETNATIVE(Float, F), 1526 DECLARE_GETSETNATIVE(Double, D), 1527 1528 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1529 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1530 1531 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1532 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1533 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1534 1535 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1536 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1537 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1538 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1539 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1540 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1541 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1542 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1543 1544 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1545 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1546 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1547 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1548 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)}, 1549 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1550 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1551 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1552 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1553 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)}, 1554 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)}, 1555 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)}, 1556 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1557 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1558}; 1559 1560JNINativeMethod loadavg_method[] = { 1561 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)} 1562}; 1563 1564JNINativeMethod prefetch_methods[] = { 1565 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1566 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}, 1567 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1568 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)} 1569}; 1570 1571JNINativeMethod memcopy_methods_17[] = { 1572 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)}, 1573 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)} 1574}; 1575 1576JNINativeMethod memcopy_methods_15[] = { 1577 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1578 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)} 1579}; 1580 1581JNINativeMethod anonk_methods[] = { 1582 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)}, 1583}; 1584 1585JNINativeMethod lform_methods[] = { 1586 {CC"shouldBeInitialized",CC"("CLS")Z", FN_PTR(Unsafe_ShouldBeInitialized)}, 1587}; 1588 1589JNINativeMethod fence_methods[] = { 1590 {CC"loadFence", CC"()V", FN_PTR(Unsafe_LoadFence)}, 1591 {CC"storeFence", CC"()V", FN_PTR(Unsafe_StoreFence)}, 1592 {CC"fullFence", CC"()V", FN_PTR(Unsafe_FullFence)}, 1593}; 1594 1595#undef CC 1596#undef FN_PTR 1597 1598#undef ADR 1599#undef LANG 1600#undef OBJ 1601#undef CLS 1602#undef CTR 1603#undef FLD 1604#undef MTH 1605#undef THR 1606#undef DC0_Args 1607#undef DC_Args 1608 1609#undef DECLARE_GETSETOOP 1610#undef DECLARE_GETSETNATIVE 1611 1612 1613/** 1614 * Helper method to register native methods. 1615 */ 1616static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) { 1617 int status = env->RegisterNatives(clazz, methods, nMethods); 1618 if (status < 0 || env->ExceptionOccurred()) { 1619 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1620 tty->print_cr("Unsafe: failed registering %s", message); 1621 } 1622 env->ExceptionClear(); 1623 return false; 1624 } else { 1625 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1626 tty->print_cr("Unsafe: successfully registered %s", message); 1627 } 1628 return true; 1629 } 1630} 1631 1632 1633// This one function is exported, used by NativeLookup. 1634// The Unsafe_xxx functions above are called only from the interpreter. 1635// The optimizer looks at names and signatures to recognize 1636// individual functions. 1637 1638JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls)) 1639 UnsafeWrapper("JVM_RegisterUnsafeMethods"); 1640 { 1641 ThreadToNativeFromVM ttnfv(thread); 1642 1643 // Unsafe methods 1644 { 1645 bool success = false; 1646 // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6 1647 if (!success) { 1648 success = register_natives("1.6 methods", env, unsafecls, methods_16, sizeof(methods_16)/sizeof(JNINativeMethod)); 1649 } 1650 if (!success) { 1651 success = register_natives("1.8 methods", env, unsafecls, methods_18, sizeof(methods_18)/sizeof(JNINativeMethod)); 1652 } 1653 if (!success) { 1654 success = register_natives("1.5 methods", env, unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod)); 1655 } 1656 if (!success) { 1657 success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod)); 1658 } 1659 if (!success) { 1660 success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod)); 1661 } 1662 guarantee(success, "register unsafe natives"); 1663 } 1664 1665 // Unsafe.getLoadAverage 1666 register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod)); 1667 1668 // Prefetch methods 1669 register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod)); 1670 1671 // Memory copy methods 1672 { 1673 bool success = false; 1674 if (!success) { 1675 success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod)); 1676 } 1677 if (!success) { 1678 success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod)); 1679 } 1680 } 1681 1682 // Unsafe.defineAnonymousClass 1683 register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod)); 1684 1685 // Unsafe.shouldBeInitialized 1686 register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod)); 1687 1688 // Fence methods 1689 register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod)); 1690 } 1691JVM_END 1692