unsafe.cpp revision 6412:53a41e7cbe05
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 "utilities/macros.hpp" 28#if INCLUDE_ALL_GCS 29#include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" 30#endif // INCLUDE_ALL_GCS 31#include "memory/allocation.inline.hpp" 32#include "prims/jni.h" 33#include "prims/jvm.h" 34#include "runtime/globals.hpp" 35#include "runtime/interfaceSupport.hpp" 36#include "runtime/orderAccess.inline.hpp" 37#include "runtime/reflection.hpp" 38#include "runtime/synchronizer.hpp" 39#include "services/threadService.hpp" 40#include "trace/tracing.hpp" 41#include "utilities/copy.hpp" 42#include "utilities/dtrace.hpp" 43 44PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 45 46/* 47 * Implementation of class sun.misc.Unsafe 48 */ 49 50 51#define MAX_OBJECT_SIZE \ 52 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \ 53 + ((julong)max_jint * sizeof(double)) ) 54 55 56#define UNSAFE_ENTRY(result_type, header) \ 57 JVM_ENTRY(result_type, header) 58 59// Can't use UNSAFE_LEAF because it has the signature of a straight 60// call into the runtime (just like JVM_LEAF, funny that) but it's 61// called like a Java Native and thus the wrapper built for it passes 62// arguments like a JNI call. It expects those arguments to be popped 63// from the stack on Intel like all good JNI args are, and adjusts the 64// stack according. Since the JVM_LEAF call expects no extra 65// arguments the stack isn't popped in the C code, is pushed by the 66// wrapper and we get sick. 67//#define UNSAFE_LEAF(result_type, header) \ 68// JVM_LEAF(result_type, header) 69 70#define UNSAFE_END JVM_END 71 72#define UnsafeWrapper(arg) /*nothing, for the present*/ 73 74 75inline void* addr_from_java(jlong addr) { 76 // This assert fails in a variety of ways on 32-bit systems. 77 // It is impossible to predict whether native code that converts 78 // pointers to longs will sign-extend or zero-extend the addresses. 79 //assert(addr == (uintptr_t)addr, "must not be odd high bits"); 80 return (void*)(uintptr_t)addr; 81} 82 83inline jlong addr_to_java(void* p) { 84 assert(p == (void*)(uintptr_t)p, "must not be odd high bits"); 85 return (uintptr_t)p; 86} 87 88 89// Note: The VM's obj_field and related accessors use byte-scaled 90// ("unscaled") offsets, just as the unsafe methods do. 91 92// However, the method Unsafe.fieldOffset explicitly declines to 93// guarantee this. The field offset values manipulated by the Java user 94// through the Unsafe API are opaque cookies that just happen to be byte 95// offsets. We represent this state of affairs by passing the cookies 96// through conversion functions when going between the VM and the Unsafe API. 97// The conversion functions just happen to be no-ops at present. 98 99inline jlong field_offset_to_byte_offset(jlong field_offset) { 100 return field_offset; 101} 102 103inline jlong field_offset_from_byte_offset(jlong byte_offset) { 104 return byte_offset; 105} 106 107inline jint invocation_key_from_method_slot(jint slot) { 108 return slot; 109} 110 111inline jint invocation_key_to_method_slot(jint key) { 112 return key; 113} 114 115inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) { 116 jlong byte_offset = field_offset_to_byte_offset(field_offset); 117#ifdef ASSERT 118 if (p != NULL) { 119 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset"); 120 if (byte_offset == (jint)byte_offset) { 121 void* ptr_plus_disp = (address)p + byte_offset; 122 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp, 123 "raw [ptr+disp] must be consistent with oop::field_base"); 124 } 125 jlong p_size = HeapWordSize * (jlong)(p->size()); 126 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size)); 127 } 128#endif 129 if (sizeof(char*) == sizeof(jint)) // (this constant folds!) 130 return (address)p + (jint) byte_offset; 131 else 132 return (address)p + byte_offset; 133} 134 135// Externally callable versions: 136// (Use these in compiler intrinsics which emulate unsafe primitives.) 137jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) { 138 return field_offset; 139} 140jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) { 141 return byte_offset; 142} 143jint Unsafe_invocation_key_from_method_slot(jint slot) { 144 return invocation_key_from_method_slot(slot); 145} 146jint Unsafe_invocation_key_to_method_slot(jint key) { 147 return invocation_key_to_method_slot(key); 148} 149 150 151///// Data in the Java heap. 152 153#define GET_FIELD(obj, offset, type_name, v) \ 154 oop p = JNIHandles::resolve(obj); \ 155 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset) 156 157#define SET_FIELD(obj, offset, type_name, x) \ 158 oop p = JNIHandles::resolve(obj); \ 159 *(type_name*)index_oop_from_field_offset_long(p, offset) = x 160 161#define GET_FIELD_VOLATILE(obj, offset, type_name, v) \ 162 oop p = JNIHandles::resolve(obj); \ 163 if (support_IRIW_for_not_multiple_copy_atomic_cpu) { \ 164 OrderAccess::fence(); \ 165 } \ 166 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset)); 167 168#define SET_FIELD_VOLATILE(obj, offset, type_name, x) \ 169 oop p = JNIHandles::resolve(obj); \ 170 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x); 171 172// Macros for oops that check UseCompressedOops 173 174#define GET_OOP_FIELD(obj, offset, v) \ 175 oop p = JNIHandles::resolve(obj); \ 176 oop v; \ 177 if (UseCompressedOops) { \ 178 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \ 179 v = oopDesc::decode_heap_oop(n); \ 180 } else { \ 181 v = *(oop*)index_oop_from_field_offset_long(p, offset); \ 182 } 183 184 185// Get/SetObject must be special-cased, since it works with handles. 186 187// The xxx140 variants for backward compatibility do not allow a full-width offset. 188UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) 189 UnsafeWrapper("Unsafe_GetObject"); 190 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); 191 GET_OOP_FIELD(obj, offset, v) 192 jobject ret = JNIHandles::make_local(env, v); 193#if INCLUDE_ALL_GCS 194 // We could be accessing the referent field in a reference 195 // object. If G1 is enabled then we need to register a non-null 196 // referent with the SATB barrier. 197 if (UseG1GC) { 198 bool needs_barrier = false; 199 200 if (ret != NULL) { 201 if (offset == java_lang_ref_Reference::referent_offset) { 202 oop o = JNIHandles::resolve_non_null(obj); 203 Klass* k = o->klass(); 204 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) { 205 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity"); 206 needs_barrier = true; 207 } 208 } 209 } 210 211 if (needs_barrier) { 212 oop referent = JNIHandles::resolve(ret); 213 G1SATBCardTableModRefBS::enqueue(referent); 214 } 215 } 216#endif // INCLUDE_ALL_GCS 217 return ret; 218UNSAFE_END 219 220UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h)) 221 UnsafeWrapper("Unsafe_SetObject"); 222 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); 223 oop x = JNIHandles::resolve(x_h); 224 //SET_FIELD(obj, offset, oop, x); 225 oop p = JNIHandles::resolve(obj); 226 if (UseCompressedOops) { 227 if (x != NULL) { 228 // If there is a heap base pointer, we are obliged to emit a store barrier. 229 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 230 } else { 231 narrowOop n = oopDesc::encode_heap_oop_not_null(x); 232 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n; 233 } 234 } else { 235 if (x != NULL) { 236 // If there is a heap base pointer, we are obliged to emit a store barrier. 237 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 238 } else { 239 *(oop*)index_oop_from_field_offset_long(p, offset) = x; 240 } 241 } 242UNSAFE_END 243 244// The normal variants allow a null base pointer with an arbitrary address. 245// But if the base pointer is non-null, the offset should make some sense. 246// That is, it should be in the range [0, MAX_OBJECT_SIZE]. 247UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 248 UnsafeWrapper("Unsafe_GetObject"); 249 GET_OOP_FIELD(obj, offset, v) 250 jobject ret = JNIHandles::make_local(env, v); 251#if INCLUDE_ALL_GCS 252 // We could be accessing the referent field in a reference 253 // object. If G1 is enabled then we need to register non-null 254 // referent with the SATB barrier. 255 if (UseG1GC) { 256 bool needs_barrier = false; 257 258 if (ret != NULL) { 259 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) { 260 oop o = JNIHandles::resolve(obj); 261 Klass* k = o->klass(); 262 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) { 263 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity"); 264 needs_barrier = true; 265 } 266 } 267 } 268 269 if (needs_barrier) { 270 oop referent = JNIHandles::resolve(ret); 271 G1SATBCardTableModRefBS::enqueue(referent); 272 } 273 } 274#endif // INCLUDE_ALL_GCS 275 return ret; 276UNSAFE_END 277 278UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 279 UnsafeWrapper("Unsafe_SetObject"); 280 oop x = JNIHandles::resolve(x_h); 281 oop p = JNIHandles::resolve(obj); 282 if (UseCompressedOops) { 283 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 284 } else { 285 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 286 } 287UNSAFE_END 288 289UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 290 UnsafeWrapper("Unsafe_GetObjectVolatile"); 291 oop p = JNIHandles::resolve(obj); 292 void* addr = index_oop_from_field_offset_long(p, offset); 293 volatile oop v; 294 if (UseCompressedOops) { 295 volatile narrowOop n = *(volatile narrowOop*) addr; 296 (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n)); 297 } else { 298 (void)const_cast<oop&>(v = *(volatile oop*) addr); 299 } 300 OrderAccess::acquire(); 301 return JNIHandles::make_local(env, v); 302UNSAFE_END 303 304UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 305 UnsafeWrapper("Unsafe_SetObjectVolatile"); 306 oop x = JNIHandles::resolve(x_h); 307 oop p = JNIHandles::resolve(obj); 308 void* addr = index_oop_from_field_offset_long(p, offset); 309 OrderAccess::release(); 310 if (UseCompressedOops) { 311 oop_store((narrowOop*)addr, x); 312 } else { 313 oop_store((oop*)addr, x); 314 } 315 OrderAccess::fence(); 316UNSAFE_END 317 318#ifndef SUPPORTS_NATIVE_CX8 319// Keep old code for platforms which may not have atomic jlong (8 bytes) instructions 320 321// Volatile long versions must use locks if !VM_Version::supports_cx8(). 322// support_cx8 is a surrogate for 'supports atomic long memory ops'. 323 324UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 325 UnsafeWrapper("Unsafe_GetLongVolatile"); 326 { 327 if (VM_Version::supports_cx8()) { 328 GET_FIELD_VOLATILE(obj, offset, jlong, v); 329 return v; 330 } 331 else { 332 Handle p (THREAD, JNIHandles::resolve(obj)); 333 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 334 ObjectLocker ol(p, THREAD); 335 jlong value = *addr; 336 return value; 337 } 338 } 339UNSAFE_END 340 341UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) 342 UnsafeWrapper("Unsafe_SetLongVolatile"); 343 { 344 if (VM_Version::supports_cx8()) { 345 SET_FIELD_VOLATILE(obj, offset, jlong, x); 346 } 347 else { 348 Handle p (THREAD, JNIHandles::resolve(obj)); 349 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 350 ObjectLocker ol(p, THREAD); 351 *addr = x; 352 } 353 } 354UNSAFE_END 355 356#endif // not SUPPORTS_NATIVE_CX8 357 358#define DEFINE_GETSETOOP(jboolean, Boolean) \ 359 \ 360UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \ 361 UnsafeWrapper("Unsafe_Get"#Boolean); \ 362 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \ 363 GET_FIELD(obj, offset, jboolean, v); \ 364 return v; \ 365UNSAFE_END \ 366 \ 367UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \ 368 UnsafeWrapper("Unsafe_Set"#Boolean); \ 369 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \ 370 SET_FIELD(obj, offset, jboolean, x); \ 371UNSAFE_END \ 372 \ 373UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \ 374 UnsafeWrapper("Unsafe_Get"#Boolean); \ 375 GET_FIELD(obj, offset, jboolean, v); \ 376 return v; \ 377UNSAFE_END \ 378 \ 379UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \ 380 UnsafeWrapper("Unsafe_Set"#Boolean); \ 381 SET_FIELD(obj, offset, jboolean, x); \ 382UNSAFE_END \ 383 \ 384// END DEFINE_GETSETOOP. 385 386DEFINE_GETSETOOP(jboolean, Boolean) 387DEFINE_GETSETOOP(jbyte, Byte) 388DEFINE_GETSETOOP(jshort, Short); 389DEFINE_GETSETOOP(jchar, Char); 390DEFINE_GETSETOOP(jint, Int); 391DEFINE_GETSETOOP(jlong, Long); 392DEFINE_GETSETOOP(jfloat, Float); 393DEFINE_GETSETOOP(jdouble, Double); 394 395#undef DEFINE_GETSETOOP 396 397#define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \ 398 \ 399UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \ 400 UnsafeWrapper("Unsafe_Get"#Boolean); \ 401 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \ 402 return v; \ 403UNSAFE_END \ 404 \ 405UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \ 406 UnsafeWrapper("Unsafe_Set"#Boolean); \ 407 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \ 408UNSAFE_END \ 409 \ 410// END DEFINE_GETSETOOP_VOLATILE. 411 412DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) 413DEFINE_GETSETOOP_VOLATILE(jbyte, Byte) 414DEFINE_GETSETOOP_VOLATILE(jshort, Short); 415DEFINE_GETSETOOP_VOLATILE(jchar, Char); 416DEFINE_GETSETOOP_VOLATILE(jint, Int); 417DEFINE_GETSETOOP_VOLATILE(jfloat, Float); 418DEFINE_GETSETOOP_VOLATILE(jdouble, Double); 419 420#ifdef SUPPORTS_NATIVE_CX8 421DEFINE_GETSETOOP_VOLATILE(jlong, Long); 422#endif 423 424#undef DEFINE_GETSETOOP_VOLATILE 425 426// The non-intrinsified versions of setOrdered just use setVolatile 427 428UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x)) 429 UnsafeWrapper("Unsafe_SetOrderedInt"); 430 SET_FIELD_VOLATILE(obj, offset, jint, x); 431UNSAFE_END 432 433UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 434 UnsafeWrapper("Unsafe_SetOrderedObject"); 435 oop x = JNIHandles::resolve(x_h); 436 oop p = JNIHandles::resolve(obj); 437 void* addr = index_oop_from_field_offset_long(p, offset); 438 OrderAccess::release(); 439 if (UseCompressedOops) { 440 oop_store((narrowOop*)addr, x); 441 } else { 442 oop_store((oop*)addr, x); 443 } 444 OrderAccess::fence(); 445UNSAFE_END 446 447UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) 448 UnsafeWrapper("Unsafe_SetOrderedLong"); 449#ifdef SUPPORTS_NATIVE_CX8 450 SET_FIELD_VOLATILE(obj, offset, jlong, x); 451#else 452 // Keep old code for platforms which may not have atomic long (8 bytes) instructions 453 { 454 if (VM_Version::supports_cx8()) { 455 SET_FIELD_VOLATILE(obj, offset, jlong, x); 456 } 457 else { 458 Handle p (THREAD, JNIHandles::resolve(obj)); 459 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 460 ObjectLocker ol(p, THREAD); 461 *addr = x; 462 } 463 } 464#endif 465UNSAFE_END 466 467UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe)) 468 UnsafeWrapper("Unsafe_LoadFence"); 469 OrderAccess::acquire(); 470UNSAFE_END 471 472UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe)) 473 UnsafeWrapper("Unsafe_StoreFence"); 474 OrderAccess::release(); 475UNSAFE_END 476 477UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe)) 478 UnsafeWrapper("Unsafe_FullFence"); 479 OrderAccess::fence(); 480UNSAFE_END 481 482////// Data in the C heap. 483 484// Note: These do not throw NullPointerException for bad pointers. 485// They just crash. Only a oop base pointer can generate a NullPointerException. 486// 487#define DEFINE_GETSETNATIVE(java_type, Type, native_type) \ 488 \ 489UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \ 490 UnsafeWrapper("Unsafe_GetNative"#Type); \ 491 void* p = addr_from_java(addr); \ 492 JavaThread* t = JavaThread::current(); \ 493 t->set_doing_unsafe_access(true); \ 494 java_type x = *(volatile native_type*)p; \ 495 t->set_doing_unsafe_access(false); \ 496 return x; \ 497UNSAFE_END \ 498 \ 499UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \ 500 UnsafeWrapper("Unsafe_SetNative"#Type); \ 501 JavaThread* t = JavaThread::current(); \ 502 t->set_doing_unsafe_access(true); \ 503 void* p = addr_from_java(addr); \ 504 *(volatile native_type*)p = x; \ 505 t->set_doing_unsafe_access(false); \ 506UNSAFE_END \ 507 \ 508// END DEFINE_GETSETNATIVE. 509 510DEFINE_GETSETNATIVE(jbyte, Byte, signed char) 511DEFINE_GETSETNATIVE(jshort, Short, signed short); 512DEFINE_GETSETNATIVE(jchar, Char, unsigned short); 513DEFINE_GETSETNATIVE(jint, Int, jint); 514// no long -- handled specially 515DEFINE_GETSETNATIVE(jfloat, Float, float); 516DEFINE_GETSETNATIVE(jdouble, Double, double); 517 518#undef DEFINE_GETSETNATIVE 519 520UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr)) 521 UnsafeWrapper("Unsafe_GetNativeLong"); 522 JavaThread* t = JavaThread::current(); 523 // We do it this way to avoid problems with access to heap using 64 524 // bit loads, as jlong in heap could be not 64-bit aligned, and on 525 // some CPUs (SPARC) it leads to SIGBUS. 526 t->set_doing_unsafe_access(true); 527 void* p = addr_from_java(addr); 528 jlong x; 529 if (((intptr_t)p & 7) == 0) { 530 // jlong is aligned, do a volatile access 531 x = *(volatile jlong*)p; 532 } else { 533 jlong_accessor acc; 534 acc.words[0] = ((volatile jint*)p)[0]; 535 acc.words[1] = ((volatile jint*)p)[1]; 536 x = acc.long_value; 537 } 538 t->set_doing_unsafe_access(false); 539 return x; 540UNSAFE_END 541 542UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 543 UnsafeWrapper("Unsafe_SetNativeLong"); 544 JavaThread* t = JavaThread::current(); 545 // see comment for Unsafe_GetNativeLong 546 t->set_doing_unsafe_access(true); 547 void* p = addr_from_java(addr); 548 if (((intptr_t)p & 7) == 0) { 549 // jlong is aligned, do a volatile access 550 *(volatile jlong*)p = x; 551 } else { 552 jlong_accessor acc; 553 acc.long_value = x; 554 ((volatile jint*)p)[0] = acc.words[0]; 555 ((volatile jint*)p)[1] = acc.words[1]; 556 } 557 t->set_doing_unsafe_access(false); 558UNSAFE_END 559 560 561UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr)) 562 UnsafeWrapper("Unsafe_GetNativeAddress"); 563 void* p = addr_from_java(addr); 564 return addr_to_java(*(void**)p); 565UNSAFE_END 566 567UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 568 UnsafeWrapper("Unsafe_SetNativeAddress"); 569 void* p = addr_from_java(addr); 570 *(void**)p = addr_from_java(x); 571UNSAFE_END 572 573 574////// Allocation requests 575 576UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls)) 577 UnsafeWrapper("Unsafe_AllocateInstance"); 578 { 579 ThreadToNativeFromVM ttnfv(thread); 580 return env->AllocObject(cls); 581 } 582UNSAFE_END 583 584UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size)) 585 UnsafeWrapper("Unsafe_AllocateMemory"); 586 size_t sz = (size_t)size; 587 if (sz != (julong)size || size < 0) { 588 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 589 } 590 if (sz == 0) { 591 return 0; 592 } 593 sz = round_to(sz, HeapWordSize); 594 void* x = os::malloc(sz, mtInternal); 595 if (x == NULL) { 596 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 597 } 598 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize); 599 return addr_to_java(x); 600UNSAFE_END 601 602UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size)) 603 UnsafeWrapper("Unsafe_ReallocateMemory"); 604 void* p = addr_from_java(addr); 605 size_t sz = (size_t)size; 606 if (sz != (julong)size || size < 0) { 607 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 608 } 609 if (sz == 0) { 610 os::free(p); 611 return 0; 612 } 613 sz = round_to(sz, HeapWordSize); 614 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal); 615 if (x == NULL) { 616 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 617 } 618 return addr_to_java(x); 619UNSAFE_END 620 621UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr)) 622 UnsafeWrapper("Unsafe_FreeMemory"); 623 void* p = addr_from_java(addr); 624 if (p == NULL) { 625 return; 626 } 627 os::free(p); 628UNSAFE_END 629 630UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value)) 631 UnsafeWrapper("Unsafe_SetMemory"); 632 size_t sz = (size_t)size; 633 if (sz != (julong)size || size < 0) { 634 THROW(vmSymbols::java_lang_IllegalArgumentException()); 635 } 636 char* p = (char*) addr_from_java(addr); 637 Copy::fill_to_memory_atomic(p, sz, value); 638UNSAFE_END 639 640UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value)) 641 UnsafeWrapper("Unsafe_SetMemory"); 642 size_t sz = (size_t)size; 643 if (sz != (julong)size || size < 0) { 644 THROW(vmSymbols::java_lang_IllegalArgumentException()); 645 } 646 oop base = JNIHandles::resolve(obj); 647 void* p = index_oop_from_field_offset_long(base, offset); 648 Copy::fill_to_memory_atomic(p, sz, value); 649UNSAFE_END 650 651UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size)) 652 UnsafeWrapper("Unsafe_CopyMemory"); 653 if (size == 0) { 654 return; 655 } 656 size_t sz = (size_t)size; 657 if (sz != (julong)size || size < 0) { 658 THROW(vmSymbols::java_lang_IllegalArgumentException()); 659 } 660 void* src = addr_from_java(srcAddr); 661 void* dst = addr_from_java(dstAddr); 662 Copy::conjoint_memory_atomic(src, dst, sz); 663UNSAFE_END 664 665UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size)) 666 UnsafeWrapper("Unsafe_CopyMemory"); 667 if (size == 0) { 668 return; 669 } 670 size_t sz = (size_t)size; 671 if (sz != (julong)size || size < 0) { 672 THROW(vmSymbols::java_lang_IllegalArgumentException()); 673 } 674 oop srcp = JNIHandles::resolve(srcObj); 675 oop dstp = JNIHandles::resolve(dstObj); 676 if (dstp != NULL && !dstp->is_typeArray()) { 677 // NYI: This works only for non-oop arrays at present. 678 // Generalizing it would be reasonable, but requires card marking. 679 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad. 680 THROW(vmSymbols::java_lang_IllegalArgumentException()); 681 } 682 void* src = index_oop_from_field_offset_long(srcp, srcOffset); 683 void* dst = index_oop_from_field_offset_long(dstp, dstOffset); 684 Copy::conjoint_memory_atomic(src, dst, sz); 685UNSAFE_END 686 687 688////// Random queries 689 690// See comment at file start about UNSAFE_LEAF 691//UNSAFE_LEAF(jint, Unsafe_AddressSize()) 692UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe)) 693 UnsafeWrapper("Unsafe_AddressSize"); 694 return sizeof(void*); 695UNSAFE_END 696 697// See comment at file start about UNSAFE_LEAF 698//UNSAFE_LEAF(jint, Unsafe_PageSize()) 699UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe)) 700 UnsafeWrapper("Unsafe_PageSize"); 701 return os::vm_page_size(); 702UNSAFE_END 703 704jint find_field_offset(jobject field, int must_be_static, TRAPS) { 705 if (field == NULL) { 706 THROW_0(vmSymbols::java_lang_NullPointerException()); 707 } 708 709 oop reflected = JNIHandles::resolve_non_null(field); 710 oop mirror = java_lang_reflect_Field::clazz(reflected); 711 Klass* k = java_lang_Class::as_Klass(mirror); 712 int slot = java_lang_reflect_Field::slot(reflected); 713 int modifiers = java_lang_reflect_Field::modifiers(reflected); 714 715 if (must_be_static >= 0) { 716 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0); 717 if (must_be_static != really_is_static) { 718 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 719 } 720 } 721 722 int offset = InstanceKlass::cast(k)->field_offset(slot); 723 return field_offset_from_byte_offset(offset); 724} 725 726UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 727 UnsafeWrapper("Unsafe_ObjectFieldOffset"); 728 return find_field_offset(field, 0, THREAD); 729UNSAFE_END 730 731UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 732 UnsafeWrapper("Unsafe_StaticFieldOffset"); 733 return find_field_offset(field, 1, THREAD); 734UNSAFE_END 735 736UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field)) 737 UnsafeWrapper("Unsafe_StaticFieldBase"); 738 // Note: In this VM implementation, a field address is always a short 739 // offset from the base of a a klass metaobject. Thus, the full dynamic 740 // range of the return type is never used. However, some implementations 741 // might put the static field inside an array shared by many classes, 742 // or even at a fixed address, in which case the address could be quite 743 // large. In that last case, this function would return NULL, since 744 // the address would operate alone, without any base pointer. 745 746 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); 747 748 oop reflected = JNIHandles::resolve_non_null(field); 749 oop mirror = java_lang_reflect_Field::clazz(reflected); 750 int modifiers = java_lang_reflect_Field::modifiers(reflected); 751 752 if ((modifiers & JVM_ACC_STATIC) == 0) { 753 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 754 } 755 756 return JNIHandles::make_local(env, mirror); 757UNSAFE_END 758 759//@deprecated 760UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 761 UnsafeWrapper("Unsafe_FieldOffset"); 762 // tries (but fails) to be polymorphic between static and non-static: 763 jlong offset = find_field_offset(field, -1, THREAD); 764 guarantee(offset == (jint)offset, "offset fits in 32 bits"); 765 return (jint)offset; 766UNSAFE_END 767 768//@deprecated 769UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz)) 770 UnsafeWrapper("Unsafe_StaticFieldBase"); 771 if (clazz == NULL) { 772 THROW_0(vmSymbols::java_lang_NullPointerException()); 773 } 774 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz)); 775UNSAFE_END 776 777UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) { 778 UnsafeWrapper("Unsafe_EnsureClassInitialized"); 779 if (clazz == NULL) { 780 THROW(vmSymbols::java_lang_NullPointerException()); 781 } 782 oop mirror = JNIHandles::resolve_non_null(clazz); 783 784 Klass* klass = java_lang_Class::as_Klass(mirror); 785 if (klass != NULL && klass->should_be_initialized()) { 786 InstanceKlass* k = InstanceKlass::cast(klass); 787 k->initialize(CHECK); 788 } 789} 790UNSAFE_END 791 792UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) { 793 UnsafeWrapper("Unsafe_ShouldBeInitialized"); 794 if (clazz == NULL) { 795 THROW_(vmSymbols::java_lang_NullPointerException(), false); 796 } 797 oop mirror = JNIHandles::resolve_non_null(clazz); 798 Klass* klass = java_lang_Class::as_Klass(mirror); 799 if (klass != NULL && klass->should_be_initialized()) { 800 return true; 801 } 802 return false; 803} 804UNSAFE_END 805 806static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) { 807 if (acls == NULL) { 808 THROW(vmSymbols::java_lang_NullPointerException()); 809 } 810 oop mirror = JNIHandles::resolve_non_null(acls); 811 Klass* k = java_lang_Class::as_Klass(mirror); 812 if (k == NULL || !k->oop_is_array()) { 813 THROW(vmSymbols::java_lang_InvalidClassException()); 814 } else if (k->oop_is_objArray()) { 815 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT); 816 scale = heapOopSize; 817 } else if (k->oop_is_typeArray()) { 818 TypeArrayKlass* tak = TypeArrayKlass::cast(k); 819 base = tak->array_header_in_bytes(); 820 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok"); 821 scale = (1 << tak->log2_element_size()); 822 } else { 823 ShouldNotReachHere(); 824 } 825} 826 827UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls)) 828 UnsafeWrapper("Unsafe_ArrayBaseOffset"); 829 int base, scale; 830 getBaseAndScale(base, scale, acls, CHECK_0); 831 return field_offset_from_byte_offset(base); 832UNSAFE_END 833 834 835UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls)) 836 UnsafeWrapper("Unsafe_ArrayIndexScale"); 837 int base, scale; 838 getBaseAndScale(base, scale, acls, CHECK_0); 839 // This VM packs both fields and array elements down to the byte. 840 // But watch out: If this changes, so that array references for 841 // a given primitive type (say, T_BOOLEAN) use different memory units 842 // than fields, this method MUST return zero for such arrays. 843 // For example, the VM used to store sub-word sized fields in full 844 // words in the object layout, so that accessors like getByte(Object,int) 845 // did not really do what one might expect for arrays. Therefore, 846 // this function used to report a zero scale factor, so that the user 847 // would know not to attempt to access sub-word array elements. 848 // // Code for unpacked fields: 849 // if (scale < wordSize) return 0; 850 851 // The following allows for a pretty general fieldOffset cookie scheme, 852 // but requires it to be linear in byte offset. 853 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0); 854UNSAFE_END 855 856 857static inline void throw_new(JNIEnv *env, const char *ename) { 858 char buf[100]; 859 strcpy(buf, "java/lang/"); 860 strcat(buf, ename); 861 jclass cls = env->FindClass(buf); 862 if (env->ExceptionCheck()) { 863 env->ExceptionClear(); 864 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf); 865 return; 866 } 867 char* msg = NULL; 868 env->ThrowNew(cls, msg); 869} 870 871static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) { 872 { 873 // Code lifted from JDK 1.3 ClassLoader.c 874 875 jbyte *body; 876 char *utfName; 877 jclass result = 0; 878 char buf[128]; 879 880 if (UsePerfData) { 881 ClassLoader::unsafe_defineClassCallCounter()->inc(); 882 } 883 884 if (data == NULL) { 885 throw_new(env, "NullPointerException"); 886 return 0; 887 } 888 889 /* Work around 4153825. malloc crashes on Solaris when passed a 890 * negative size. 891 */ 892 if (length < 0) { 893 throw_new(env, "ArrayIndexOutOfBoundsException"); 894 return 0; 895 } 896 897 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal); 898 899 if (body == 0) { 900 throw_new(env, "OutOfMemoryError"); 901 return 0; 902 } 903 904 env->GetByteArrayRegion(data, offset, length, body); 905 906 if (env->ExceptionOccurred()) 907 goto free_body; 908 909 if (name != NULL) { 910 uint len = env->GetStringUTFLength(name); 911 int unicode_len = env->GetStringLength(name); 912 if (len >= sizeof(buf)) { 913 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 914 if (utfName == NULL) { 915 throw_new(env, "OutOfMemoryError"); 916 goto free_body; 917 } 918 } else { 919 utfName = buf; 920 } 921 env->GetStringUTFRegion(name, 0, unicode_len, utfName); 922 //VerifyFixClassname(utfName); 923 for (uint i = 0; i < len; i++) { 924 if (utfName[i] == '.') utfName[i] = '/'; 925 } 926 } else { 927 utfName = NULL; 928 } 929 930 result = JVM_DefineClass(env, utfName, loader, body, length, pd); 931 932 if (utfName && utfName != buf) 933 FREE_C_HEAP_ARRAY(char, utfName, mtInternal); 934 935 free_body: 936 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal); 937 return result; 938 } 939} 940 941 942UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd)) 943 UnsafeWrapper("Unsafe_DefineClass"); 944 { 945 ThreadToNativeFromVM ttnfv(thread); 946 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd); 947 } 948UNSAFE_END 949 950 951UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length)) 952 UnsafeWrapper("Unsafe_DefineClass"); 953 { 954 ThreadToNativeFromVM ttnfv(thread); 955 956 int depthFromDefineClass0 = 1; 957 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0); 958 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller); 959 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller); 960 961 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd); 962 } 963UNSAFE_END 964 965 966#define DAC_Args CLS"[B["OBJ 967// define a class but do not make it known to the class loader or system dictionary 968// - host_class: supplies context for linkage, access control, protection domain, and class loader 969// - data: bytes of a class file, a raw memory address (length gives the number of bytes) 970// - cp_patches: where non-null entries exist, they replace corresponding CP entries in data 971 972// When you load an anonymous class U, it works as if you changed its name just before loading, 973// to a name that you will never use again. Since the name is lost, no other class can directly 974// link to any member of U. Just after U is loaded, the only way to use it is reflectively, 975// through java.lang.Class methods like Class.newInstance. 976 977// Access checks for linkage sites within U continue to follow the same rules as for named classes. 978// The package of an anonymous class is given by the package qualifier on the name under which it was loaded. 979// An anonymous class also has special privileges to access any member of its host class. 980// This is the main reason why this loading operation is unsafe. The purpose of this is to 981// allow language implementations to simulate "open classes"; a host class in effect gets 982// new code when an anonymous class is loaded alongside it. A less convenient but more 983// standard way to do this is with reflection, which can also be set to ignore access 984// restrictions. 985 986// Access into an anonymous class is possible only through reflection. Therefore, there 987// are no special access rules for calling into an anonymous class. The relaxed access 988// rule for the host class is applied in the opposite direction: A host class reflectively 989// access one of its anonymous classes. 990 991// If you load the same bytecodes twice, you get two different classes. You can reload 992// the same bytecodes with or without varying CP patches. 993 994// By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1. 995// The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is). 996// The CONSTANT_Class entry for that name can be patched to refer directly to U1. 997 998// This allows, for example, U2 to use U1 as a superclass or super-interface, or as 999// an outer class (so that U2 is an anonymous inner class of anonymous U1). 1000// It is not possible for a named class, or an older anonymous class, to refer by 1001// name (via its CP) to a newer anonymous class. 1002 1003// CP patching may also be used to modify (i.e., hack) the names of methods, classes, 1004// or type descriptors used in the loaded anonymous class. 1005 1006// Finally, CP patching may be used to introduce "live" objects into the constant pool, 1007// instead of "dead" strings. A compiled statement like println((Object)"hello") can 1008// be changed to println(greeting), where greeting is an arbitrary object created before 1009// the anonymous class is loaded. This is useful in dynamic languages, in which 1010// various kinds of metaobjects must be introduced as constants into bytecode. 1011// Note the cast (Object), which tells the verifier to expect an arbitrary object, 1012// not just a literal string. For such ldc instructions, the verifier uses the 1013// type Object instead of String, if the loaded constant is not in fact a String. 1014 1015static instanceKlassHandle 1016Unsafe_DefineAnonymousClass_impl(JNIEnv *env, 1017 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh, 1018 HeapWord* *temp_alloc, 1019 TRAPS) { 1020 1021 if (UsePerfData) { 1022 ClassLoader::unsafe_defineClassCallCounter()->inc(); 1023 } 1024 1025 if (data == NULL) { 1026 THROW_0(vmSymbols::java_lang_NullPointerException()); 1027 } 1028 1029 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length(); 1030 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord); 1031 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal); 1032 if (body == NULL) { 1033 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 1034 } 1035 1036 // caller responsible to free it: 1037 (*temp_alloc) = body; 1038 1039 { 1040 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0); 1041 Copy::conjoint_words((HeapWord*) array_base, body, word_length); 1042 } 1043 1044 u1* class_bytes = (u1*) body; 1045 int class_bytes_length = (int) length; 1046 if (class_bytes_length < 0) class_bytes_length = 0; 1047 if (class_bytes == NULL 1048 || host_class == NULL 1049 || length != class_bytes_length) 1050 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 1051 1052 objArrayHandle cp_patches_h; 1053 if (cp_patches_jh != NULL) { 1054 oop p = JNIHandles::resolve_non_null(cp_patches_jh); 1055 if (!p->is_objArray()) 1056 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 1057 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p); 1058 } 1059 1060 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class))); 1061 const char* host_source = host_klass->external_name(); 1062 Handle host_loader(THREAD, host_klass->class_loader()); 1063 Handle host_domain(THREAD, host_klass->protection_domain()); 1064 1065 GrowableArray<Handle>* cp_patches = NULL; 1066 if (cp_patches_h.not_null()) { 1067 int alen = cp_patches_h->length(); 1068 for (int i = alen-1; i >= 0; i--) { 1069 oop p = cp_patches_h->obj_at(i); 1070 if (p != NULL) { 1071 Handle patch(THREAD, p); 1072 if (cp_patches == NULL) 1073 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle()); 1074 cp_patches->at_put(i, patch); 1075 } 1076 } 1077 } 1078 1079 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source); 1080 1081 instanceKlassHandle anon_klass; 1082 { 1083 Symbol* no_class_name = NULL; 1084 Klass* anonk = SystemDictionary::parse_stream(no_class_name, 1085 host_loader, host_domain, 1086 &st, host_klass, cp_patches, 1087 CHECK_NULL); 1088 if (anonk == NULL) return NULL; 1089 anon_klass = instanceKlassHandle(THREAD, anonk); 1090 } 1091 1092 return anon_klass; 1093} 1094 1095UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh)) 1096{ 1097 instanceKlassHandle anon_klass; 1098 jobject res_jh = NULL; 1099 1100 UnsafeWrapper("Unsafe_DefineAnonymousClass"); 1101 ResourceMark rm(THREAD); 1102 1103 HeapWord* temp_alloc = NULL; 1104 1105 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data, 1106 cp_patches_jh, 1107 &temp_alloc, THREAD); 1108 if (anon_klass() != NULL) 1109 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror()); 1110 1111 // try/finally clause: 1112 if (temp_alloc != NULL) { 1113 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal); 1114 } 1115 1116 // The anonymous class loader data has been artificially been kept alive to 1117 // this point. The mirror and any instances of this class have to keep 1118 // it alive afterwards. 1119 if (anon_klass() != NULL) { 1120 anon_klass->class_loader_data()->set_keep_alive(false); 1121 } 1122 1123 // let caller initialize it as needed... 1124 1125 return (jclass) res_jh; 1126} 1127UNSAFE_END 1128 1129 1130 1131UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 1132 UnsafeWrapper("Unsafe_MonitorEnter"); 1133 { 1134 if (jobj == NULL) { 1135 THROW(vmSymbols::java_lang_NullPointerException()); 1136 } 1137 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 1138 ObjectSynchronizer::jni_enter(obj, CHECK); 1139 } 1140UNSAFE_END 1141 1142 1143UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 1144 UnsafeWrapper("Unsafe_TryMonitorEnter"); 1145 { 1146 if (jobj == NULL) { 1147 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 1148 } 1149 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 1150 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0); 1151 return (res ? JNI_TRUE : JNI_FALSE); 1152 } 1153UNSAFE_END 1154 1155 1156UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj)) 1157 UnsafeWrapper("Unsafe_MonitorExit"); 1158 { 1159 if (jobj == NULL) { 1160 THROW(vmSymbols::java_lang_NullPointerException()); 1161 } 1162 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj)); 1163 ObjectSynchronizer::jni_exit(obj(), CHECK); 1164 } 1165UNSAFE_END 1166 1167 1168UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr)) 1169 UnsafeWrapper("Unsafe_ThrowException"); 1170 { 1171 ThreadToNativeFromVM ttnfv(thread); 1172 env->Throw(thr); 1173 } 1174UNSAFE_END 1175 1176// JSR166 ------------------------------------------------------------------ 1177 1178UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h)) 1179 UnsafeWrapper("Unsafe_CompareAndSwapObject"); 1180 oop x = JNIHandles::resolve(x_h); 1181 oop e = JNIHandles::resolve(e_h); 1182 oop p = JNIHandles::resolve(obj); 1183 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset); 1184 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true); 1185 jboolean success = (res == e); 1186 if (success) 1187 update_barrier_set((void*)addr, x); 1188 return success; 1189UNSAFE_END 1190 1191UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x)) 1192 UnsafeWrapper("Unsafe_CompareAndSwapInt"); 1193 oop p = JNIHandles::resolve(obj); 1194 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset); 1195 return (jint)(Atomic::cmpxchg(x, addr, e)) == e; 1196UNSAFE_END 1197 1198UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x)) 1199 UnsafeWrapper("Unsafe_CompareAndSwapLong"); 1200 Handle p (THREAD, JNIHandles::resolve(obj)); 1201 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 1202 if (VM_Version::supports_cx8()) 1203 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e; 1204 else { 1205 jboolean success = false; 1206 ObjectLocker ol(p, THREAD); 1207 if (*addr == e) { *addr = x; success = true; } 1208 return success; 1209 } 1210UNSAFE_END 1211 1212UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time)) 1213 UnsafeWrapper("Unsafe_Park"); 1214 EventThreadPark event; 1215 HOTSPOT_THREAD_PARK_BEGIN((uintptr_t) thread->parker(), (int) isAbsolute, time); 1216 1217 JavaThreadParkedState jtps(thread, time != 0); 1218 thread->parker()->park(isAbsolute != 0, time); 1219 1220 HOTSPOT_THREAD_PARK_END((uintptr_t) thread->parker()); 1221 if (event.should_commit()) { 1222 oop obj = thread->current_park_blocker(); 1223 event.set_klass((obj != NULL) ? obj->klass() : NULL); 1224 event.set_timeout(time); 1225 event.set_address((obj != NULL) ? (TYPE_ADDRESS) cast_from_oop<uintptr_t>(obj) : 0); 1226 event.commit(); 1227 } 1228UNSAFE_END 1229 1230UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread)) 1231 UnsafeWrapper("Unsafe_Unpark"); 1232 Parker* p = NULL; 1233 if (jthread != NULL) { 1234 oop java_thread = JNIHandles::resolve_non_null(jthread); 1235 if (java_thread != NULL) { 1236 jlong lp = java_lang_Thread::park_event(java_thread); 1237 if (lp != 0) { 1238 // This cast is OK even though the jlong might have been read 1239 // non-atomically on 32bit systems, since there, one word will 1240 // always be zero anyway and the value set is always the same 1241 p = (Parker*)addr_from_java(lp); 1242 } else { 1243 // Grab lock if apparently null or using older version of library 1244 MutexLocker mu(Threads_lock); 1245 java_thread = JNIHandles::resolve_non_null(jthread); 1246 if (java_thread != NULL) { 1247 JavaThread* thr = java_lang_Thread::thread(java_thread); 1248 if (thr != NULL) { 1249 p = thr->parker(); 1250 if (p != NULL) { // Bind to Java thread for next time. 1251 java_lang_Thread::set_park_event(java_thread, addr_to_java(p)); 1252 } 1253 } 1254 } 1255 } 1256 } 1257 } 1258 if (p != NULL) { 1259 HOTSPOT_THREAD_UNPARK((uintptr_t) p); 1260 p->unpark(); 1261 } 1262UNSAFE_END 1263 1264UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem)) 1265 UnsafeWrapper("Unsafe_Loadavg"); 1266 const int max_nelem = 3; 1267 double la[max_nelem]; 1268 jint ret; 1269 1270 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg)); 1271 assert(a->is_typeArray(), "must be type array"); 1272 1273 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) { 1274 ThreadToNativeFromVM ttnfv(thread); 1275 throw_new(env, "ArrayIndexOutOfBoundsException"); 1276 return -1; 1277 } 1278 1279 ret = os::loadavg(la, nelem); 1280 if (ret == -1) return -1; 1281 1282 // if successful, ret is the number of samples actually retrieved. 1283 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value"); 1284 switch(ret) { 1285 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through 1286 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through 1287 case 1: a->double_at_put(0, (jdouble)la[0]); break; 1288 } 1289 return ret; 1290UNSAFE_END 1291 1292UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 1293 UnsafeWrapper("Unsafe_PrefetchRead"); 1294 oop p = JNIHandles::resolve(obj); 1295 void* addr = index_oop_from_field_offset_long(p, 0); 1296 Prefetch::read(addr, (intx)offset); 1297UNSAFE_END 1298 1299UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 1300 UnsafeWrapper("Unsafe_PrefetchWrite"); 1301 oop p = JNIHandles::resolve(obj); 1302 void* addr = index_oop_from_field_offset_long(p, 0); 1303 Prefetch::write(addr, (intx)offset); 1304UNSAFE_END 1305 1306 1307/// JVM_RegisterUnsafeMethods 1308 1309#define ADR "J" 1310 1311#define LANG "Ljava/lang/" 1312 1313#define OBJ LANG"Object;" 1314#define CLS LANG"Class;" 1315#define CTR LANG"reflect/Constructor;" 1316#define FLD LANG"reflect/Field;" 1317#define MTH LANG"reflect/Method;" 1318#define THR LANG"Throwable;" 1319 1320#define DC0_Args LANG"String;[BII" 1321#define DC_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;" 1322 1323#define CC (char*) /*cast a literal from (const char*)*/ 1324#define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1325 1326// define deprecated accessors for compabitility with 1.4.0 1327#define DECLARE_GETSETOOP_140(Boolean, Z) \ 1328 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \ 1329 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)} 1330 1331// Note: In 1.4.1, getObject and kin take both int and long offsets. 1332#define DECLARE_GETSETOOP_141(Boolean, Z) \ 1333 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1334 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)} 1335 1336// Note: In 1.5.0, there are volatile versions too 1337#define DECLARE_GETSETOOP(Boolean, Z) \ 1338 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1339 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \ 1340 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \ 1341 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)} 1342 1343 1344#define DECLARE_GETSETNATIVE(Byte, B) \ 1345 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \ 1346 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)} 1347 1348 1349 1350// These are the methods for 1.4.0 1351static JNINativeMethod methods_140[] = { 1352 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)}, 1353 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)}, 1354 1355 DECLARE_GETSETOOP_140(Boolean, Z), 1356 DECLARE_GETSETOOP_140(Byte, B), 1357 DECLARE_GETSETOOP_140(Short, S), 1358 DECLARE_GETSETOOP_140(Char, C), 1359 DECLARE_GETSETOOP_140(Int, I), 1360 DECLARE_GETSETOOP_140(Long, J), 1361 DECLARE_GETSETOOP_140(Float, F), 1362 DECLARE_GETSETOOP_140(Double, D), 1363 1364 DECLARE_GETSETNATIVE(Byte, B), 1365 DECLARE_GETSETNATIVE(Short, S), 1366 DECLARE_GETSETNATIVE(Char, C), 1367 DECLARE_GETSETNATIVE(Int, I), 1368 DECLARE_GETSETNATIVE(Long, J), 1369 DECLARE_GETSETNATIVE(Float, F), 1370 DECLARE_GETSETNATIVE(Double, D), 1371 1372 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1373 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1374 1375 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1376 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1377 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1378 1379 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, 1380 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, 1381 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1382 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1383 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1384 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1385 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1386 1387 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1388 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1389 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1390 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1391 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1392 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)} 1393}; 1394 1395// These are the methods prior to the JSR 166 changes in 1.5.0 1396static JNINativeMethod methods_141[] = { 1397 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1398 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1399 1400 DECLARE_GETSETOOP_141(Boolean, Z), 1401 DECLARE_GETSETOOP_141(Byte, B), 1402 DECLARE_GETSETOOP_141(Short, S), 1403 DECLARE_GETSETOOP_141(Char, C), 1404 DECLARE_GETSETOOP_141(Int, I), 1405 DECLARE_GETSETOOP_141(Long, J), 1406 DECLARE_GETSETOOP_141(Float, F), 1407 DECLARE_GETSETOOP_141(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 1440}; 1441 1442// These are the methods prior to the JSR 166 changes in 1.6.0 1443static JNINativeMethod methods_15[] = { 1444 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1445 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1446 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1447 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1448 1449 1450 DECLARE_GETSETOOP(Boolean, Z), 1451 DECLARE_GETSETOOP(Byte, B), 1452 DECLARE_GETSETOOP(Short, S), 1453 DECLARE_GETSETOOP(Char, C), 1454 DECLARE_GETSETOOP(Int, I), 1455 DECLARE_GETSETOOP(Long, J), 1456 DECLARE_GETSETOOP(Float, F), 1457 DECLARE_GETSETOOP(Double, D), 1458 1459 DECLARE_GETSETNATIVE(Byte, B), 1460 DECLARE_GETSETNATIVE(Short, S), 1461 DECLARE_GETSETNATIVE(Char, C), 1462 DECLARE_GETSETNATIVE(Int, I), 1463 DECLARE_GETSETNATIVE(Long, J), 1464 DECLARE_GETSETNATIVE(Float, F), 1465 DECLARE_GETSETNATIVE(Double, D), 1466 1467 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1468 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1469 1470 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1471 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1472 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1473 1474 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1475 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1476 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1477 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1478 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1479 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1480 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1481 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1482 1483 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1484 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1485 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1486 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1487 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1488 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1489 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1490 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1491 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1492 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1493 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1494 1495}; 1496 1497// These are the methods for 1.6.0 and 1.7.0 1498static JNINativeMethod methods_16[] = { 1499 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1500 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1501 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1502 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1503 1504 DECLARE_GETSETOOP(Boolean, Z), 1505 DECLARE_GETSETOOP(Byte, B), 1506 DECLARE_GETSETOOP(Short, S), 1507 DECLARE_GETSETOOP(Char, C), 1508 DECLARE_GETSETOOP(Int, I), 1509 DECLARE_GETSETOOP(Long, J), 1510 DECLARE_GETSETOOP(Float, F), 1511 DECLARE_GETSETOOP(Double, D), 1512 1513 DECLARE_GETSETNATIVE(Byte, B), 1514 DECLARE_GETSETNATIVE(Short, S), 1515 DECLARE_GETSETNATIVE(Char, C), 1516 DECLARE_GETSETNATIVE(Int, I), 1517 DECLARE_GETSETNATIVE(Long, J), 1518 DECLARE_GETSETNATIVE(Float, F), 1519 DECLARE_GETSETNATIVE(Double, D), 1520 1521 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1522 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1523 1524 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1525 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1526 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1527 1528 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1529 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1530 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1531 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1532 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1533 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1534 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1535 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1536 1537 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1538 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1539 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1540 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1541 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1542 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)}, 1543 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1544 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1545 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1546 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1547 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)}, 1548 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)}, 1549 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)}, 1550 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1551 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1552}; 1553 1554// These are the methods for 1.8.0 1555static JNINativeMethod methods_18[] = { 1556 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1557 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1558 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1559 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1560 1561 DECLARE_GETSETOOP(Boolean, Z), 1562 DECLARE_GETSETOOP(Byte, B), 1563 DECLARE_GETSETOOP(Short, S), 1564 DECLARE_GETSETOOP(Char, C), 1565 DECLARE_GETSETOOP(Int, I), 1566 DECLARE_GETSETOOP(Long, J), 1567 DECLARE_GETSETOOP(Float, F), 1568 DECLARE_GETSETOOP(Double, D), 1569 1570 DECLARE_GETSETNATIVE(Byte, B), 1571 DECLARE_GETSETNATIVE(Short, S), 1572 DECLARE_GETSETNATIVE(Char, C), 1573 DECLARE_GETSETNATIVE(Int, I), 1574 DECLARE_GETSETNATIVE(Long, J), 1575 DECLARE_GETSETNATIVE(Float, F), 1576 DECLARE_GETSETNATIVE(Double, D), 1577 1578 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1579 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1580 1581 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1582 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1583 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1584 1585 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1586 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1587 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1588 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1589 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1590 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1591 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1592 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1593 1594 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1595 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1596 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1597 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1598 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)}, 1599 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1600 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1601 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1602 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1603 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)}, 1604 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)}, 1605 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)}, 1606 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1607 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1608}; 1609 1610JNINativeMethod loadavg_method[] = { 1611 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)} 1612}; 1613 1614JNINativeMethod prefetch_methods[] = { 1615 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1616 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}, 1617 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1618 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)} 1619}; 1620 1621JNINativeMethod memcopy_methods_17[] = { 1622 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)}, 1623 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)} 1624}; 1625 1626JNINativeMethod memcopy_methods_15[] = { 1627 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1628 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)} 1629}; 1630 1631JNINativeMethod anonk_methods[] = { 1632 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)}, 1633}; 1634 1635JNINativeMethod lform_methods[] = { 1636 {CC"shouldBeInitialized",CC"("CLS")Z", FN_PTR(Unsafe_ShouldBeInitialized)}, 1637}; 1638 1639JNINativeMethod fence_methods[] = { 1640 {CC"loadFence", CC"()V", FN_PTR(Unsafe_LoadFence)}, 1641 {CC"storeFence", CC"()V", FN_PTR(Unsafe_StoreFence)}, 1642 {CC"fullFence", CC"()V", FN_PTR(Unsafe_FullFence)}, 1643}; 1644 1645#undef CC 1646#undef FN_PTR 1647 1648#undef ADR 1649#undef LANG 1650#undef OBJ 1651#undef CLS 1652#undef CTR 1653#undef FLD 1654#undef MTH 1655#undef THR 1656#undef DC0_Args 1657#undef DC_Args 1658 1659#undef DECLARE_GETSETOOP 1660#undef DECLARE_GETSETNATIVE 1661 1662 1663/** 1664 * Helper method to register native methods. 1665 */ 1666static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) { 1667 int status = env->RegisterNatives(clazz, methods, nMethods); 1668 if (status < 0 || env->ExceptionOccurred()) { 1669 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1670 tty->print_cr("Unsafe: failed registering %s", message); 1671 } 1672 env->ExceptionClear(); 1673 return false; 1674 } else { 1675 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1676 tty->print_cr("Unsafe: successfully registered %s", message); 1677 } 1678 return true; 1679 } 1680} 1681 1682 1683// This one function is exported, used by NativeLookup. 1684// The Unsafe_xxx functions above are called only from the interpreter. 1685// The optimizer looks at names and signatures to recognize 1686// individual functions. 1687 1688JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls)) 1689 UnsafeWrapper("JVM_RegisterUnsafeMethods"); 1690 { 1691 ThreadToNativeFromVM ttnfv(thread); 1692 1693 // Unsafe methods 1694 { 1695 bool success = false; 1696 // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6 1697 if (!success) { 1698 success = register_natives("1.6 methods", env, unsafecls, methods_16, sizeof(methods_16)/sizeof(JNINativeMethod)); 1699 } 1700 if (!success) { 1701 success = register_natives("1.8 methods", env, unsafecls, methods_18, sizeof(methods_18)/sizeof(JNINativeMethod)); 1702 } 1703 if (!success) { 1704 success = register_natives("1.5 methods", env, unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod)); 1705 } 1706 if (!success) { 1707 success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod)); 1708 } 1709 if (!success) { 1710 success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod)); 1711 } 1712 guarantee(success, "register unsafe natives"); 1713 } 1714 1715 // Unsafe.getLoadAverage 1716 register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod)); 1717 1718 // Prefetch methods 1719 register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod)); 1720 1721 // Memory copy methods 1722 { 1723 bool success = false; 1724 if (!success) { 1725 success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod)); 1726 } 1727 if (!success) { 1728 success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod)); 1729 } 1730 } 1731 1732 // Unsafe.defineAnonymousClass 1733 register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod)); 1734 1735 // Unsafe.shouldBeInitialized 1736 register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod)); 1737 1738 // Fence methods 1739 register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod)); 1740 } 1741JVM_END 1742