unsafe.cpp revision 3602:da91efe96a93
1/* 2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "classfile/vmSymbols.hpp" 27#ifndef SERIALGC 28#include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" 29#endif // SERIALGC 30#include "memory/allocation.inline.hpp" 31#include "prims/jni.h" 32#include "prims/jvm.h" 33#include "runtime/globals.hpp" 34#include "runtime/interfaceSupport.hpp" 35#include "runtime/reflection.hpp" 36#include "runtime/synchronizer.hpp" 37#include "services/threadService.hpp" 38#include "utilities/copy.hpp" 39#include "utilities/dtrace.hpp" 40 41/* 42 * Implementation of class sun.misc.Unsafe 43 */ 44 45#ifndef USDT2 46HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long); 47HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t); 48HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t); 49#endif /* !USDT2 */ 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 // Don't allow unsafe to be used to read or write the header word of oops 118 assert(p == NULL || field_offset >= oopDesc::header_size(), "offset must be outside of header"); 119#ifdef ASSERT 120 if (p != NULL) { 121 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset"); 122 if (byte_offset == (jint)byte_offset) { 123 void* ptr_plus_disp = (address)p + byte_offset; 124 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp, 125 "raw [ptr+disp] must be consistent with oop::field_base"); 126 } 127 } 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 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset)); 164 165#define SET_FIELD_VOLATILE(obj, offset, type_name, x) \ 166 oop p = JNIHandles::resolve(obj); \ 167 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x); 168 169// Macros for oops that check UseCompressedOops 170 171#define GET_OOP_FIELD(obj, offset, v) \ 172 oop p = JNIHandles::resolve(obj); \ 173 oop v; \ 174 if (UseCompressedOops) { \ 175 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \ 176 v = oopDesc::decode_heap_oop(n); \ 177 } else { \ 178 v = *(oop*)index_oop_from_field_offset_long(p, offset); \ 179 } 180 181 182// Get/SetObject must be special-cased, since it works with handles. 183 184// The xxx140 variants for backward compatibility do not allow a full-width offset. 185UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) 186 UnsafeWrapper("Unsafe_GetObject"); 187 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); 188 GET_OOP_FIELD(obj, offset, v) 189 jobject ret = JNIHandles::make_local(env, v); 190#ifndef SERIALGC 191 // We could be accessing the referent field in a reference 192 // object. If G1 is enabled then we need to register a non-null 193 // referent with the SATB barrier. 194 if (UseG1GC) { 195 bool needs_barrier = false; 196 197 if (ret != NULL) { 198 if (offset == java_lang_ref_Reference::referent_offset) { 199 oop o = JNIHandles::resolve_non_null(obj); 200 Klass* k = o->klass(); 201 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) { 202 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity"); 203 needs_barrier = true; 204 } 205 } 206 } 207 208 if (needs_barrier) { 209 oop referent = JNIHandles::resolve(ret); 210 G1SATBCardTableModRefBS::enqueue(referent); 211 } 212 } 213#endif // SERIALGC 214 return ret; 215UNSAFE_END 216 217UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h)) 218 UnsafeWrapper("Unsafe_SetObject"); 219 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); 220 oop x = JNIHandles::resolve(x_h); 221 //SET_FIELD(obj, offset, oop, x); 222 oop p = JNIHandles::resolve(obj); 223 if (UseCompressedOops) { 224 if (x != NULL) { 225 // If there is a heap base pointer, we are obliged to emit a store barrier. 226 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 227 } else { 228 narrowOop n = oopDesc::encode_heap_oop_not_null(x); 229 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n; 230 } 231 } else { 232 if (x != NULL) { 233 // If there is a heap base pointer, we are obliged to emit a store barrier. 234 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 235 } else { 236 *(oop*)index_oop_from_field_offset_long(p, offset) = x; 237 } 238 } 239UNSAFE_END 240 241// The normal variants allow a null base pointer with an arbitrary address. 242// But if the base pointer is non-null, the offset should make some sense. 243// That is, it should be in the range [0, MAX_OBJECT_SIZE]. 244UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 245 UnsafeWrapper("Unsafe_GetObject"); 246 GET_OOP_FIELD(obj, offset, v) 247 jobject ret = JNIHandles::make_local(env, v); 248#ifndef SERIALGC 249 // We could be accessing the referent field in a reference 250 // object. If G1 is enabled then we need to register non-null 251 // referent with the SATB barrier. 252 if (UseG1GC) { 253 bool needs_barrier = false; 254 255 if (ret != NULL) { 256 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) { 257 oop o = JNIHandles::resolve(obj); 258 Klass* k = o->klass(); 259 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) { 260 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity"); 261 needs_barrier = true; 262 } 263 } 264 } 265 266 if (needs_barrier) { 267 oop referent = JNIHandles::resolve(ret); 268 G1SATBCardTableModRefBS::enqueue(referent); 269 } 270 } 271#endif // SERIALGC 272 return ret; 273UNSAFE_END 274 275UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 276 UnsafeWrapper("Unsafe_SetObject"); 277 oop x = JNIHandles::resolve(x_h); 278 oop p = JNIHandles::resolve(obj); 279 if (UseCompressedOops) { 280 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 281 } else { 282 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 283 } 284UNSAFE_END 285 286UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 287 UnsafeWrapper("Unsafe_GetObjectVolatile"); 288 oop p = JNIHandles::resolve(obj); 289 void* addr = index_oop_from_field_offset_long(p, offset); 290 volatile oop v; 291 if (UseCompressedOops) { 292 volatile narrowOop n = *(volatile narrowOop*) addr; 293 v = oopDesc::decode_heap_oop(n); 294 } else { 295 v = *(volatile oop*) addr; 296 } 297 OrderAccess::acquire(); 298 return JNIHandles::make_local(env, v); 299UNSAFE_END 300 301UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 302 UnsafeWrapper("Unsafe_SetObjectVolatile"); 303 oop x = JNIHandles::resolve(x_h); 304 oop p = JNIHandles::resolve(obj); 305 void* addr = index_oop_from_field_offset_long(p, offset); 306 OrderAccess::release(); 307 if (UseCompressedOops) { 308 oop_store((narrowOop*)addr, x); 309 } else { 310 oop_store((oop*)addr, x); 311 } 312 OrderAccess::fence(); 313UNSAFE_END 314 315#if defined(SPARC) || defined(X86) 316// Sparc and X86 have atomic jlong (8 bytes) instructions 317 318#else 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 SPARC and not X86 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#if defined(SPARC) || defined(X86) 421// Sparc and X86 have atomic jlong (8 bytes) instructions 422DEFINE_GETSETOOP_VOLATILE(jlong, Long); 423#endif 424 425#undef DEFINE_GETSETOOP_VOLATILE 426 427// The non-intrinsified versions of setOrdered just use setVolatile 428 429UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x)) 430 UnsafeWrapper("Unsafe_SetOrderedInt"); 431 SET_FIELD_VOLATILE(obj, offset, jint, x); 432UNSAFE_END 433 434UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 435 UnsafeWrapper("Unsafe_SetOrderedObject"); 436 oop x = JNIHandles::resolve(x_h); 437 oop p = JNIHandles::resolve(obj); 438 void* addr = index_oop_from_field_offset_long(p, offset); 439 OrderAccess::release(); 440 if (UseCompressedOops) { 441 oop_store((narrowOop*)addr, x); 442 } else { 443 oop_store((oop*)addr, x); 444 } 445 OrderAccess::fence(); 446UNSAFE_END 447 448UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) 449 UnsafeWrapper("Unsafe_SetOrderedLong"); 450#if defined(SPARC) || defined(X86) 451 // Sparc and X86 have atomic jlong (8 bytes) instructions 452 SET_FIELD_VOLATILE(obj, offset, jlong, x); 453#else 454 // Keep old code for platforms which may not have atomic long (8 bytes) instructions 455 { 456 if (VM_Version::supports_cx8()) { 457 SET_FIELD_VOLATILE(obj, offset, jlong, x); 458 } 459 else { 460 Handle p (THREAD, JNIHandles::resolve(obj)); 461 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 462 ObjectLocker ol(p, THREAD); 463 *addr = x; 464 } 465 } 466#endif 467UNSAFE_END 468 469////// Data in the C heap. 470 471// Note: These do not throw NullPointerException for bad pointers. 472// They just crash. Only a oop base pointer can generate a NullPointerException. 473// 474#define DEFINE_GETSETNATIVE(java_type, Type, native_type) \ 475 \ 476UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \ 477 UnsafeWrapper("Unsafe_GetNative"#Type); \ 478 void* p = addr_from_java(addr); \ 479 JavaThread* t = JavaThread::current(); \ 480 t->set_doing_unsafe_access(true); \ 481 java_type x = *(volatile native_type*)p; \ 482 t->set_doing_unsafe_access(false); \ 483 return x; \ 484UNSAFE_END \ 485 \ 486UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \ 487 UnsafeWrapper("Unsafe_SetNative"#Type); \ 488 JavaThread* t = JavaThread::current(); \ 489 t->set_doing_unsafe_access(true); \ 490 void* p = addr_from_java(addr); \ 491 *(volatile native_type*)p = x; \ 492 t->set_doing_unsafe_access(false); \ 493UNSAFE_END \ 494 \ 495// END DEFINE_GETSETNATIVE. 496 497DEFINE_GETSETNATIVE(jbyte, Byte, signed char) 498DEFINE_GETSETNATIVE(jshort, Short, signed short); 499DEFINE_GETSETNATIVE(jchar, Char, unsigned short); 500DEFINE_GETSETNATIVE(jint, Int, jint); 501// no long -- handled specially 502DEFINE_GETSETNATIVE(jfloat, Float, float); 503DEFINE_GETSETNATIVE(jdouble, Double, double); 504 505#undef DEFINE_GETSETNATIVE 506 507UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr)) 508 UnsafeWrapper("Unsafe_GetNativeLong"); 509 JavaThread* t = JavaThread::current(); 510 // We do it this way to avoid problems with access to heap using 64 511 // bit loads, as jlong in heap could be not 64-bit aligned, and on 512 // some CPUs (SPARC) it leads to SIGBUS. 513 t->set_doing_unsafe_access(true); 514 void* p = addr_from_java(addr); 515 jlong x; 516 if (((intptr_t)p & 7) == 0) { 517 // jlong is aligned, do a volatile access 518 x = *(volatile jlong*)p; 519 } else { 520 jlong_accessor acc; 521 acc.words[0] = ((volatile jint*)p)[0]; 522 acc.words[1] = ((volatile jint*)p)[1]; 523 x = acc.long_value; 524 } 525 t->set_doing_unsafe_access(false); 526 return x; 527UNSAFE_END 528 529UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 530 UnsafeWrapper("Unsafe_SetNativeLong"); 531 JavaThread* t = JavaThread::current(); 532 // see comment for Unsafe_GetNativeLong 533 t->set_doing_unsafe_access(true); 534 void* p = addr_from_java(addr); 535 if (((intptr_t)p & 7) == 0) { 536 // jlong is aligned, do a volatile access 537 *(volatile jlong*)p = x; 538 } else { 539 jlong_accessor acc; 540 acc.long_value = x; 541 ((volatile jint*)p)[0] = acc.words[0]; 542 ((volatile jint*)p)[1] = acc.words[1]; 543 } 544 t->set_doing_unsafe_access(false); 545UNSAFE_END 546 547 548UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr)) 549 UnsafeWrapper("Unsafe_GetNativeAddress"); 550 void* p = addr_from_java(addr); 551 return addr_to_java(*(void**)p); 552UNSAFE_END 553 554UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 555 UnsafeWrapper("Unsafe_SetNativeAddress"); 556 void* p = addr_from_java(addr); 557 *(void**)p = addr_from_java(x); 558UNSAFE_END 559 560 561////// Allocation requests 562 563UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls)) 564 UnsafeWrapper("Unsafe_AllocateInstance"); 565 { 566 ThreadToNativeFromVM ttnfv(thread); 567 return env->AllocObject(cls); 568 } 569UNSAFE_END 570 571UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size)) 572 UnsafeWrapper("Unsafe_AllocateMemory"); 573 size_t sz = (size_t)size; 574 if (sz != (julong)size || size < 0) { 575 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 576 } 577 if (sz == 0) { 578 return 0; 579 } 580 sz = round_to(sz, HeapWordSize); 581 void* x = os::malloc(sz, mtInternal); 582 if (x == NULL) { 583 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 584 } 585 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize); 586 return addr_to_java(x); 587UNSAFE_END 588 589UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size)) 590 UnsafeWrapper("Unsafe_ReallocateMemory"); 591 void* p = addr_from_java(addr); 592 size_t sz = (size_t)size; 593 if (sz != (julong)size || size < 0) { 594 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 595 } 596 if (sz == 0) { 597 os::free(p); 598 return 0; 599 } 600 sz = round_to(sz, HeapWordSize); 601 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal); 602 if (x == NULL) { 603 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 604 } 605 return addr_to_java(x); 606UNSAFE_END 607 608UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr)) 609 UnsafeWrapper("Unsafe_FreeMemory"); 610 void* p = addr_from_java(addr); 611 if (p == NULL) { 612 return; 613 } 614 os::free(p); 615UNSAFE_END 616 617UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value)) 618 UnsafeWrapper("Unsafe_SetMemory"); 619 size_t sz = (size_t)size; 620 if (sz != (julong)size || size < 0) { 621 THROW(vmSymbols::java_lang_IllegalArgumentException()); 622 } 623 char* p = (char*) addr_from_java(addr); 624 Copy::fill_to_memory_atomic(p, sz, value); 625UNSAFE_END 626 627UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value)) 628 UnsafeWrapper("Unsafe_SetMemory"); 629 size_t sz = (size_t)size; 630 if (sz != (julong)size || size < 0) { 631 THROW(vmSymbols::java_lang_IllegalArgumentException()); 632 } 633 oop base = JNIHandles::resolve(obj); 634 void* p = index_oop_from_field_offset_long(base, offset); 635 Copy::fill_to_memory_atomic(p, sz, value); 636UNSAFE_END 637 638UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size)) 639 UnsafeWrapper("Unsafe_CopyMemory"); 640 if (size == 0) { 641 return; 642 } 643 size_t sz = (size_t)size; 644 if (sz != (julong)size || size < 0) { 645 THROW(vmSymbols::java_lang_IllegalArgumentException()); 646 } 647 void* src = addr_from_java(srcAddr); 648 void* dst = addr_from_java(dstAddr); 649 Copy::conjoint_memory_atomic(src, dst, sz); 650UNSAFE_END 651 652UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size)) 653 UnsafeWrapper("Unsafe_CopyMemory"); 654 if (size == 0) { 655 return; 656 } 657 size_t sz = (size_t)size; 658 if (sz != (julong)size || size < 0) { 659 THROW(vmSymbols::java_lang_IllegalArgumentException()); 660 } 661 oop srcp = JNIHandles::resolve(srcObj); 662 oop dstp = JNIHandles::resolve(dstObj); 663 if (dstp != NULL && !dstp->is_typeArray()) { 664 // NYI: This works only for non-oop arrays at present. 665 // Generalizing it would be reasonable, but requires card marking. 666 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad. 667 THROW(vmSymbols::java_lang_IllegalArgumentException()); 668 } 669 void* src = index_oop_from_field_offset_long(srcp, srcOffset); 670 void* dst = index_oop_from_field_offset_long(dstp, dstOffset); 671 Copy::conjoint_memory_atomic(src, dst, sz); 672UNSAFE_END 673 674 675////// Random queries 676 677// See comment at file start about UNSAFE_LEAF 678//UNSAFE_LEAF(jint, Unsafe_AddressSize()) 679UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe)) 680 UnsafeWrapper("Unsafe_AddressSize"); 681 return sizeof(void*); 682UNSAFE_END 683 684// See comment at file start about UNSAFE_LEAF 685//UNSAFE_LEAF(jint, Unsafe_PageSize()) 686UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe)) 687 UnsafeWrapper("Unsafe_PageSize"); 688 return os::vm_page_size(); 689UNSAFE_END 690 691jint find_field_offset(jobject field, int must_be_static, TRAPS) { 692 if (field == NULL) { 693 THROW_0(vmSymbols::java_lang_NullPointerException()); 694 } 695 696 oop reflected = JNIHandles::resolve_non_null(field); 697 oop mirror = java_lang_reflect_Field::clazz(reflected); 698 Klass* k = java_lang_Class::as_Klass(mirror); 699 int slot = java_lang_reflect_Field::slot(reflected); 700 int modifiers = java_lang_reflect_Field::modifiers(reflected); 701 702 if (must_be_static >= 0) { 703 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0); 704 if (must_be_static != really_is_static) { 705 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 706 } 707 } 708 709 int offset = InstanceKlass::cast(k)->field_offset(slot); 710 return field_offset_from_byte_offset(offset); 711} 712 713UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 714 UnsafeWrapper("Unsafe_ObjectFieldOffset"); 715 return find_field_offset(field, 0, THREAD); 716UNSAFE_END 717 718UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 719 UnsafeWrapper("Unsafe_StaticFieldOffset"); 720 return find_field_offset(field, 1, THREAD); 721UNSAFE_END 722 723UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field)) 724 UnsafeWrapper("Unsafe_StaticFieldBase"); 725 // Note: In this VM implementation, a field address is always a short 726 // offset from the base of a a klass metaobject. Thus, the full dynamic 727 // range of the return type is never used. However, some implementations 728 // might put the static field inside an array shared by many classes, 729 // or even at a fixed address, in which case the address could be quite 730 // large. In that last case, this function would return NULL, since 731 // the address would operate alone, without any base pointer. 732 733 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); 734 735 oop reflected = JNIHandles::resolve_non_null(field); 736 oop mirror = java_lang_reflect_Field::clazz(reflected); 737 int modifiers = java_lang_reflect_Field::modifiers(reflected); 738 739 if ((modifiers & JVM_ACC_STATIC) == 0) { 740 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 741 } 742 743 return JNIHandles::make_local(env, mirror); 744UNSAFE_END 745 746//@deprecated 747UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 748 UnsafeWrapper("Unsafe_FieldOffset"); 749 // tries (but fails) to be polymorphic between static and non-static: 750 jlong offset = find_field_offset(field, -1, THREAD); 751 guarantee(offset == (jint)offset, "offset fits in 32 bits"); 752 return (jint)offset; 753UNSAFE_END 754 755//@deprecated 756UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz)) 757 UnsafeWrapper("Unsafe_StaticFieldBase"); 758 if (clazz == NULL) { 759 THROW_0(vmSymbols::java_lang_NullPointerException()); 760 } 761 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz)); 762UNSAFE_END 763 764UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) { 765 UnsafeWrapper("Unsafe_EnsureClassInitialized"); 766 if (clazz == NULL) { 767 THROW(vmSymbols::java_lang_NullPointerException()); 768 } 769 oop mirror = JNIHandles::resolve_non_null(clazz); 770 771 Klass* klass = java_lang_Class::as_Klass(mirror); 772 if (klass != NULL && Klass::cast(klass)->should_be_initialized()) { 773 InstanceKlass* k = InstanceKlass::cast(klass); 774 k->initialize(CHECK); 775 } 776} 777UNSAFE_END 778 779UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) { 780 UnsafeWrapper("Unsafe_ShouldBeInitialized"); 781 if (clazz == NULL) { 782 THROW_(vmSymbols::java_lang_NullPointerException(), false); 783 } 784 oop mirror = JNIHandles::resolve_non_null(clazz); 785 Klass* klass = java_lang_Class::as_Klass(mirror); 786 if (klass != NULL && Klass::cast(klass)->should_be_initialized()) { 787 return true; 788 } 789 return false; 790} 791UNSAFE_END 792 793static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) { 794 if (acls == NULL) { 795 THROW(vmSymbols::java_lang_NullPointerException()); 796 } 797 oop mirror = JNIHandles::resolve_non_null(acls); 798 Klass* k = java_lang_Class::as_Klass(mirror); 799 if (k == NULL || !k->oop_is_array()) { 800 THROW(vmSymbols::java_lang_InvalidClassException()); 801 } else if (k->oop_is_objArray()) { 802 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT); 803 scale = heapOopSize; 804 } else if (k->oop_is_typeArray()) { 805 typeArrayKlass* tak = typeArrayKlass::cast(k); 806 base = tak->array_header_in_bytes(); 807 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok"); 808 scale = (1 << tak->log2_element_size()); 809 } else { 810 ShouldNotReachHere(); 811 } 812} 813 814UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls)) 815 UnsafeWrapper("Unsafe_ArrayBaseOffset"); 816 int base, scale; 817 getBaseAndScale(base, scale, acls, CHECK_0); 818 return field_offset_from_byte_offset(base); 819UNSAFE_END 820 821 822UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls)) 823 UnsafeWrapper("Unsafe_ArrayIndexScale"); 824 int base, scale; 825 getBaseAndScale(base, scale, acls, CHECK_0); 826 // This VM packs both fields and array elements down to the byte. 827 // But watch out: If this changes, so that array references for 828 // a given primitive type (say, T_BOOLEAN) use different memory units 829 // than fields, this method MUST return zero for such arrays. 830 // For example, the VM used to store sub-word sized fields in full 831 // words in the object layout, so that accessors like getByte(Object,int) 832 // did not really do what one might expect for arrays. Therefore, 833 // this function used to report a zero scale factor, so that the user 834 // would know not to attempt to access sub-word array elements. 835 // // Code for unpacked fields: 836 // if (scale < wordSize) return 0; 837 838 // The following allows for a pretty general fieldOffset cookie scheme, 839 // but requires it to be linear in byte offset. 840 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0); 841UNSAFE_END 842 843 844static inline void throw_new(JNIEnv *env, const char *ename) { 845 char buf[100]; 846 strcpy(buf, "java/lang/"); 847 strcat(buf, ename); 848 jclass cls = env->FindClass(buf); 849 char* msg = NULL; 850 env->ThrowNew(cls, msg); 851} 852 853static jclass Unsafe_DefineClass(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) { 854 { 855 // Code lifted from JDK 1.3 ClassLoader.c 856 857 jbyte *body; 858 char *utfName; 859 jclass result = 0; 860 char buf[128]; 861 862 if (UsePerfData) { 863 ClassLoader::unsafe_defineClassCallCounter()->inc(); 864 } 865 866 if (data == NULL) { 867 throw_new(env, "NullPointerException"); 868 return 0; 869 } 870 871 /* Work around 4153825. malloc crashes on Solaris when passed a 872 * negative size. 873 */ 874 if (length < 0) { 875 throw_new(env, "ArrayIndexOutOfBoundsException"); 876 return 0; 877 } 878 879 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal); 880 881 if (body == 0) { 882 throw_new(env, "OutOfMemoryError"); 883 return 0; 884 } 885 886 env->GetByteArrayRegion(data, offset, length, body); 887 888 if (env->ExceptionOccurred()) 889 goto free_body; 890 891 if (name != NULL) { 892 uint len = env->GetStringUTFLength(name); 893 int unicode_len = env->GetStringLength(name); 894 if (len >= sizeof(buf)) { 895 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 896 if (utfName == NULL) { 897 throw_new(env, "OutOfMemoryError"); 898 goto free_body; 899 } 900 } else { 901 utfName = buf; 902 } 903 env->GetStringUTFRegion(name, 0, unicode_len, utfName); 904 //VerifyFixClassname(utfName); 905 for (uint i = 0; i < len; i++) { 906 if (utfName[i] == '.') utfName[i] = '/'; 907 } 908 } else { 909 utfName = NULL; 910 } 911 912 result = JVM_DefineClass(env, utfName, loader, body, length, pd); 913 914 if (utfName && utfName != buf) 915 FREE_C_HEAP_ARRAY(char, utfName, mtInternal); 916 917 free_body: 918 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal); 919 return result; 920 } 921} 922 923 924UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length)) 925 UnsafeWrapper("Unsafe_DefineClass"); 926 { 927 ThreadToNativeFromVM ttnfv(thread); 928 929 int depthFromDefineClass0 = 1; 930 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0); 931 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller); 932 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller); 933 934 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd); 935 } 936UNSAFE_END 937 938 939UNSAFE_ENTRY(jclass, Unsafe_DefineClass1(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd)) 940 UnsafeWrapper("Unsafe_DefineClass"); 941 { 942 ThreadToNativeFromVM ttnfv(thread); 943 944 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd); 945 } 946UNSAFE_END 947 948#define DAC_Args CLS"[B["OBJ 949// define a class but do not make it known to the class loader or system dictionary 950// - host_class: supplies context for linkage, access control, protection domain, and class loader 951// - data: bytes of a class file, a raw memory address (length gives the number of bytes) 952// - cp_patches: where non-null entries exist, they replace corresponding CP entries in data 953 954// When you load an anonymous class U, it works as if you changed its name just before loading, 955// to a name that you will never use again. Since the name is lost, no other class can directly 956// link to any member of U. Just after U is loaded, the only way to use it is reflectively, 957// through java.lang.Class methods like Class.newInstance. 958 959// Access checks for linkage sites within U continue to follow the same rules as for named classes. 960// The package of an anonymous class is given by the package qualifier on the name under which it was loaded. 961// An anonymous class also has special privileges to access any member of its host class. 962// This is the main reason why this loading operation is unsafe. The purpose of this is to 963// allow language implementations to simulate "open classes"; a host class in effect gets 964// new code when an anonymous class is loaded alongside it. A less convenient but more 965// standard way to do this is with reflection, which can also be set to ignore access 966// restrictions. 967 968// Access into an anonymous class is possible only through reflection. Therefore, there 969// are no special access rules for calling into an anonymous class. The relaxed access 970// rule for the host class is applied in the opposite direction: A host class reflectively 971// access one of its anonymous classes. 972 973// If you load the same bytecodes twice, you get two different classes. You can reload 974// the same bytecodes with or without varying CP patches. 975 976// By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1. 977// The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is). 978// The CONSTANT_Class entry for that name can be patched to refer directly to U1. 979 980// This allows, for example, U2 to use U1 as a superclass or super-interface, or as 981// an outer class (so that U2 is an anonymous inner class of anonymous U1). 982// It is not possible for a named class, or an older anonymous class, to refer by 983// name (via its CP) to a newer anonymous class. 984 985// CP patching may also be used to modify (i.e., hack) the names of methods, classes, 986// or type descriptors used in the loaded anonymous class. 987 988// Finally, CP patching may be used to introduce "live" objects into the constant pool, 989// instead of "dead" strings. A compiled statement like println((Object)"hello") can 990// be changed to println(greeting), where greeting is an arbitrary object created before 991// the anonymous class is loaded. This is useful in dynamic languages, in which 992// various kinds of metaobjects must be introduced as constants into bytecode. 993// Note the cast (Object), which tells the verifier to expect an arbitrary object, 994// not just a literal string. For such ldc instructions, the verifier uses the 995// type Object instead of String, if the loaded constant is not in fact a String. 996 997static oop 998Unsafe_DefineAnonymousClass_impl(JNIEnv *env, 999 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh, 1000 HeapWord* *temp_alloc, 1001 TRAPS) { 1002 1003 if (UsePerfData) { 1004 ClassLoader::unsafe_defineClassCallCounter()->inc(); 1005 } 1006 1007 if (data == NULL) { 1008 THROW_0(vmSymbols::java_lang_NullPointerException()); 1009 } 1010 1011 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length(); 1012 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord); 1013 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal); 1014 if (body == NULL) { 1015 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 1016 } 1017 1018 // caller responsible to free it: 1019 (*temp_alloc) = body; 1020 1021 { 1022 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0); 1023 Copy::conjoint_words((HeapWord*) array_base, body, word_length); 1024 } 1025 1026 u1* class_bytes = (u1*) body; 1027 int class_bytes_length = (int) length; 1028 if (class_bytes_length < 0) class_bytes_length = 0; 1029 if (class_bytes == NULL 1030 || host_class == NULL 1031 || length != class_bytes_length) 1032 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 1033 1034 objArrayHandle cp_patches_h; 1035 if (cp_patches_jh != NULL) { 1036 oop p = JNIHandles::resolve_non_null(cp_patches_jh); 1037 if (!p->is_objArray()) 1038 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 1039 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p); 1040 } 1041 1042 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class))); 1043 const char* host_source = host_klass->external_name(); 1044 Handle host_loader(THREAD, host_klass->class_loader()); 1045 Handle host_domain(THREAD, host_klass->protection_domain()); 1046 1047 GrowableArray<Handle>* cp_patches = NULL; 1048 if (cp_patches_h.not_null()) { 1049 int alen = cp_patches_h->length(); 1050 for (int i = alen-1; i >= 0; i--) { 1051 oop p = cp_patches_h->obj_at(i); 1052 if (p != NULL) { 1053 Handle patch(THREAD, p); 1054 if (cp_patches == NULL) 1055 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle()); 1056 cp_patches->at_put(i, patch); 1057 } 1058 } 1059 } 1060 1061 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source); 1062 1063 instanceKlassHandle anon_klass; 1064 { 1065 Symbol* no_class_name = NULL; 1066 Klass* anonk = SystemDictionary::parse_stream(no_class_name, 1067 host_loader, host_domain, 1068 &st, host_klass, cp_patches, 1069 CHECK_NULL); 1070 if (anonk == NULL) return NULL; 1071 anon_klass = instanceKlassHandle(THREAD, anonk); 1072 } 1073 1074 // let caller initialize it as needed... 1075 1076 return anon_klass->java_mirror(); 1077} 1078 1079UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh)) 1080{ 1081 UnsafeWrapper("Unsafe_DefineAnonymousClass"); 1082 ResourceMark rm(THREAD); 1083 1084 HeapWord* temp_alloc = NULL; 1085 1086 jobject res_jh = NULL; 1087 1088 { oop res_oop = Unsafe_DefineAnonymousClass_impl(env, 1089 host_class, data, cp_patches_jh, 1090 &temp_alloc, THREAD); 1091 if (res_oop != NULL) 1092 res_jh = JNIHandles::make_local(env, res_oop); 1093 } 1094 1095 // try/finally clause: 1096 if (temp_alloc != NULL) { 1097 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal); 1098 } 1099 1100 return (jclass) res_jh; 1101} 1102UNSAFE_END 1103 1104 1105 1106UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 1107 UnsafeWrapper("Unsafe_MonitorEnter"); 1108 { 1109 if (jobj == NULL) { 1110 THROW(vmSymbols::java_lang_NullPointerException()); 1111 } 1112 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 1113 ObjectSynchronizer::jni_enter(obj, CHECK); 1114 } 1115UNSAFE_END 1116 1117 1118UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 1119 UnsafeWrapper("Unsafe_TryMonitorEnter"); 1120 { 1121 if (jobj == NULL) { 1122 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 1123 } 1124 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 1125 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0); 1126 return (res ? JNI_TRUE : JNI_FALSE); 1127 } 1128UNSAFE_END 1129 1130 1131UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj)) 1132 UnsafeWrapper("Unsafe_MonitorExit"); 1133 { 1134 if (jobj == NULL) { 1135 THROW(vmSymbols::java_lang_NullPointerException()); 1136 } 1137 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj)); 1138 ObjectSynchronizer::jni_exit(obj(), CHECK); 1139 } 1140UNSAFE_END 1141 1142 1143UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr)) 1144 UnsafeWrapper("Unsafe_ThrowException"); 1145 { 1146 ThreadToNativeFromVM ttnfv(thread); 1147 env->Throw(thr); 1148 } 1149UNSAFE_END 1150 1151// JSR166 ------------------------------------------------------------------ 1152 1153UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h)) 1154 UnsafeWrapper("Unsafe_CompareAndSwapObject"); 1155 oop x = JNIHandles::resolve(x_h); 1156 oop e = JNIHandles::resolve(e_h); 1157 oop p = JNIHandles::resolve(obj); 1158 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset); 1159 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true); 1160 jboolean success = (res == e); 1161 if (success) 1162 update_barrier_set((void*)addr, x); 1163 return success; 1164UNSAFE_END 1165 1166UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x)) 1167 UnsafeWrapper("Unsafe_CompareAndSwapInt"); 1168 oop p = JNIHandles::resolve(obj); 1169 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset); 1170 return (jint)(Atomic::cmpxchg(x, addr, e)) == e; 1171UNSAFE_END 1172 1173UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x)) 1174 UnsafeWrapper("Unsafe_CompareAndSwapLong"); 1175 Handle p (THREAD, JNIHandles::resolve(obj)); 1176 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 1177 if (VM_Version::supports_cx8()) 1178 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e; 1179 else { 1180 jboolean success = false; 1181 ObjectLocker ol(p, THREAD); 1182 if (*addr == e) { *addr = x; success = true; } 1183 return success; 1184 } 1185UNSAFE_END 1186 1187UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time)) 1188 UnsafeWrapper("Unsafe_Park"); 1189#ifndef USDT2 1190 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time); 1191#else /* USDT2 */ 1192 HOTSPOT_THREAD_PARK_BEGIN( 1193 (uintptr_t) thread->parker(), (int) isAbsolute, time); 1194#endif /* USDT2 */ 1195 JavaThreadParkedState jtps(thread, time != 0); 1196 thread->parker()->park(isAbsolute != 0, time); 1197#ifndef USDT2 1198 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker()); 1199#else /* USDT2 */ 1200 HOTSPOT_THREAD_PARK_END( 1201 (uintptr_t) thread->parker()); 1202#endif /* USDT2 */ 1203UNSAFE_END 1204 1205UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread)) 1206 UnsafeWrapper("Unsafe_Unpark"); 1207 Parker* p = NULL; 1208 if (jthread != NULL) { 1209 oop java_thread = JNIHandles::resolve_non_null(jthread); 1210 if (java_thread != NULL) { 1211 jlong lp = java_lang_Thread::park_event(java_thread); 1212 if (lp != 0) { 1213 // This cast is OK even though the jlong might have been read 1214 // non-atomically on 32bit systems, since there, one word will 1215 // always be zero anyway and the value set is always the same 1216 p = (Parker*)addr_from_java(lp); 1217 } else { 1218 // Grab lock if apparently null or using older version of library 1219 MutexLocker mu(Threads_lock); 1220 java_thread = JNIHandles::resolve_non_null(jthread); 1221 if (java_thread != NULL) { 1222 JavaThread* thr = java_lang_Thread::thread(java_thread); 1223 if (thr != NULL) { 1224 p = thr->parker(); 1225 if (p != NULL) { // Bind to Java thread for next time. 1226 java_lang_Thread::set_park_event(java_thread, addr_to_java(p)); 1227 } 1228 } 1229 } 1230 } 1231 } 1232 } 1233 if (p != NULL) { 1234#ifndef USDT2 1235 HS_DTRACE_PROBE1(hotspot, thread__unpark, p); 1236#else /* USDT2 */ 1237 HOTSPOT_THREAD_UNPARK( 1238 (uintptr_t) p); 1239#endif /* USDT2 */ 1240 p->unpark(); 1241 } 1242UNSAFE_END 1243 1244UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem)) 1245 UnsafeWrapper("Unsafe_Loadavg"); 1246 const int max_nelem = 3; 1247 double la[max_nelem]; 1248 jint ret; 1249 1250 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg)); 1251 assert(a->is_typeArray(), "must be type array"); 1252 1253 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) { 1254 ThreadToNativeFromVM ttnfv(thread); 1255 throw_new(env, "ArrayIndexOutOfBoundsException"); 1256 return -1; 1257 } 1258 1259 ret = os::loadavg(la, nelem); 1260 if (ret == -1) return -1; 1261 1262 // if successful, ret is the number of samples actually retrieved. 1263 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value"); 1264 switch(ret) { 1265 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through 1266 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through 1267 case 1: a->double_at_put(0, (jdouble)la[0]); break; 1268 } 1269 return ret; 1270UNSAFE_END 1271 1272UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 1273 UnsafeWrapper("Unsafe_PrefetchRead"); 1274 oop p = JNIHandles::resolve(obj); 1275 void* addr = index_oop_from_field_offset_long(p, 0); 1276 Prefetch::read(addr, (intx)offset); 1277UNSAFE_END 1278 1279UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 1280 UnsafeWrapper("Unsafe_PrefetchWrite"); 1281 oop p = JNIHandles::resolve(obj); 1282 void* addr = index_oop_from_field_offset_long(p, 0); 1283 Prefetch::write(addr, (intx)offset); 1284UNSAFE_END 1285 1286 1287/// JVM_RegisterUnsafeMethods 1288 1289#define ADR "J" 1290 1291#define LANG "Ljava/lang/" 1292 1293#define OBJ LANG"Object;" 1294#define CLS LANG"Class;" 1295#define CTR LANG"reflect/Constructor;" 1296#define FLD LANG"reflect/Field;" 1297#define MTH LANG"reflect/Method;" 1298#define THR LANG"Throwable;" 1299 1300#define DC0_Args LANG"String;[BII" 1301#define DC1_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;" 1302 1303#define CC (char*) /*cast a literal from (const char*)*/ 1304#define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1305 1306// define deprecated accessors for compabitility with 1.4.0 1307#define DECLARE_GETSETOOP_140(Boolean, Z) \ 1308 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \ 1309 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)} 1310 1311// Note: In 1.4.1, getObject and kin take both int and long offsets. 1312#define DECLARE_GETSETOOP_141(Boolean, Z) \ 1313 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1314 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)} 1315 1316// Note: In 1.5.0, there are volatile versions too 1317#define DECLARE_GETSETOOP(Boolean, Z) \ 1318 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1319 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \ 1320 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \ 1321 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)} 1322 1323 1324#define DECLARE_GETSETNATIVE(Byte, B) \ 1325 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \ 1326 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)} 1327 1328 1329 1330// %%% These are temporarily supported until the SDK sources 1331// contain the necessarily updated Unsafe.java. 1332static JNINativeMethod methods_140[] = { 1333 1334 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)}, 1335 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)}, 1336 1337 DECLARE_GETSETOOP_140(Boolean, Z), 1338 DECLARE_GETSETOOP_140(Byte, B), 1339 DECLARE_GETSETOOP_140(Short, S), 1340 DECLARE_GETSETOOP_140(Char, C), 1341 DECLARE_GETSETOOP_140(Int, I), 1342 DECLARE_GETSETOOP_140(Long, J), 1343 DECLARE_GETSETOOP_140(Float, F), 1344 DECLARE_GETSETOOP_140(Double, D), 1345 1346 DECLARE_GETSETNATIVE(Byte, B), 1347 DECLARE_GETSETNATIVE(Short, S), 1348 DECLARE_GETSETNATIVE(Char, C), 1349 DECLARE_GETSETNATIVE(Int, I), 1350 DECLARE_GETSETNATIVE(Long, J), 1351 DECLARE_GETSETNATIVE(Float, F), 1352 DECLARE_GETSETNATIVE(Double, D), 1353 1354 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1355 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1356 1357 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1358 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1359// {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1360// {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}, 1361 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1362 1363 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, //deprecated 1364 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, //deprecated 1365 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1366 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1367 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1368 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1369 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1370 1371 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1372 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)}, 1373 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1374 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1375 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1376 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)} 1377}; 1378 1379// These are the old methods prior to the JSR 166 changes in 1.5.0 1380static JNINativeMethod methods_141[] = { 1381 1382 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1383 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1384 1385 DECLARE_GETSETOOP_141(Boolean, Z), 1386 DECLARE_GETSETOOP_141(Byte, B), 1387 DECLARE_GETSETOOP_141(Short, S), 1388 DECLARE_GETSETOOP_141(Char, C), 1389 DECLARE_GETSETOOP_141(Int, I), 1390 DECLARE_GETSETOOP_141(Long, J), 1391 DECLARE_GETSETOOP_141(Float, F), 1392 DECLARE_GETSETOOP_141(Double, D), 1393 1394 DECLARE_GETSETNATIVE(Byte, B), 1395 DECLARE_GETSETNATIVE(Short, S), 1396 DECLARE_GETSETNATIVE(Char, C), 1397 DECLARE_GETSETNATIVE(Int, I), 1398 DECLARE_GETSETNATIVE(Long, J), 1399 DECLARE_GETSETNATIVE(Float, F), 1400 DECLARE_GETSETNATIVE(Double, D), 1401 1402 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1403 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1404 1405 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1406 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1407// {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1408// {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}, 1409 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1410 1411 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1412 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1413 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1414 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1415 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1416 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1417 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1418 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1419 1420 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1421 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)}, 1422 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1423 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1424 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1425 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)} 1426 1427}; 1428 1429// These are the old methods prior to the JSR 166 changes in 1.6.0 1430static JNINativeMethod methods_15[] = { 1431 1432 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1433 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1434 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1435 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1436 1437 1438 DECLARE_GETSETOOP(Boolean, Z), 1439 DECLARE_GETSETOOP(Byte, B), 1440 DECLARE_GETSETOOP(Short, S), 1441 DECLARE_GETSETOOP(Char, C), 1442 DECLARE_GETSETOOP(Int, I), 1443 DECLARE_GETSETOOP(Long, J), 1444 DECLARE_GETSETOOP(Float, F), 1445 DECLARE_GETSETOOP(Double, D), 1446 1447 DECLARE_GETSETNATIVE(Byte, B), 1448 DECLARE_GETSETNATIVE(Short, S), 1449 DECLARE_GETSETNATIVE(Char, C), 1450 DECLARE_GETSETNATIVE(Int, I), 1451 DECLARE_GETSETNATIVE(Long, J), 1452 DECLARE_GETSETNATIVE(Float, F), 1453 DECLARE_GETSETNATIVE(Double, D), 1454 1455 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1456 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1457 1458 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1459 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1460// {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1461// {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}, 1462 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1463 1464 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1465 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1466 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1467 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1468 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1469 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1470 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1471 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1472 1473 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1474 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)}, 1475 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1476 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1477 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1478 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1479 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1480 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1481 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1482 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1483 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1484 1485}; 1486 1487// These are the correct methods, moving forward: 1488static JNINativeMethod methods[] = { 1489 1490 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1491 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1492 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1493 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1494 1495 1496 DECLARE_GETSETOOP(Boolean, Z), 1497 DECLARE_GETSETOOP(Byte, B), 1498 DECLARE_GETSETOOP(Short, S), 1499 DECLARE_GETSETOOP(Char, C), 1500 DECLARE_GETSETOOP(Int, I), 1501 DECLARE_GETSETOOP(Long, J), 1502 DECLARE_GETSETOOP(Float, F), 1503 DECLARE_GETSETOOP(Double, D), 1504 1505 DECLARE_GETSETNATIVE(Byte, B), 1506 DECLARE_GETSETNATIVE(Short, S), 1507 DECLARE_GETSETNATIVE(Char, C), 1508 DECLARE_GETSETNATIVE(Int, I), 1509 DECLARE_GETSETNATIVE(Long, J), 1510 DECLARE_GETSETNATIVE(Float, F), 1511 DECLARE_GETSETNATIVE(Double, D), 1512 1513 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1514 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1515 1516 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1517 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1518// {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1519// {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}, 1520 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1521 1522 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1523 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1524 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1525 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1526 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1527 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1528 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1529 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1530 1531 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1532 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)}, 1533 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1534 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1535 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1536 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)}, 1537 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1538 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1539 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1540 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1541 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)}, 1542 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)}, 1543 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)}, 1544 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1545 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1546 1547// {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}, 1548 1549// {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1550// {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)} 1551// {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1552// {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)} 1553 1554}; 1555 1556JNINativeMethod loadavg_method[] = { 1557 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)} 1558}; 1559 1560JNINativeMethod prefetch_methods[] = { 1561 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1562 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}, 1563 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1564 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)} 1565}; 1566 1567JNINativeMethod memcopy_methods[] = { 1568 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)}, 1569 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)} 1570}; 1571 1572JNINativeMethod memcopy_methods_15[] = { 1573 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1574 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)} 1575}; 1576 1577JNINativeMethod anonk_methods[] = { 1578 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)}, 1579}; 1580 1581JNINativeMethod lform_methods[] = { 1582 {CC"shouldBeInitialized",CC"("CLS")Z", FN_PTR(Unsafe_ShouldBeInitialized)}, 1583}; 1584 1585#undef CC 1586#undef FN_PTR 1587 1588#undef ADR 1589#undef LANG 1590#undef OBJ 1591#undef CLS 1592#undef CTR 1593#undef FLD 1594#undef MTH 1595#undef THR 1596#undef DC0_Args 1597#undef DC1_Args 1598 1599#undef DECLARE_GETSETOOP 1600#undef DECLARE_GETSETNATIVE 1601 1602 1603// This one function is exported, used by NativeLookup. 1604// The Unsafe_xxx functions above are called only from the interpreter. 1605// The optimizer looks at names and signatures to recognize 1606// individual functions. 1607 1608JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls)) 1609 UnsafeWrapper("JVM_RegisterUnsafeMethods"); 1610 { 1611 ThreadToNativeFromVM ttnfv(thread); 1612 { 1613 env->RegisterNatives(unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod)); 1614 if (env->ExceptionOccurred()) { 1615 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1616 tty->print_cr("Warning: SDK 1.6 Unsafe.loadavg not found."); 1617 } 1618 env->ExceptionClear(); 1619 } 1620 } 1621 { 1622 env->RegisterNatives(unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod)); 1623 if (env->ExceptionOccurred()) { 1624 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1625 tty->print_cr("Warning: SDK 1.6 Unsafe.prefetchRead/Write not found."); 1626 } 1627 env->ExceptionClear(); 1628 } 1629 } 1630 { 1631 env->RegisterNatives(unsafecls, memcopy_methods, sizeof(memcopy_methods)/sizeof(JNINativeMethod)); 1632 if (env->ExceptionOccurred()) { 1633 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1634 tty->print_cr("Warning: SDK 1.7 Unsafe.copyMemory not found."); 1635 } 1636 env->ExceptionClear(); 1637 env->RegisterNatives(unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod)); 1638 if (env->ExceptionOccurred()) { 1639 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1640 tty->print_cr("Warning: SDK 1.5 Unsafe.copyMemory not found."); 1641 } 1642 env->ExceptionClear(); 1643 } 1644 } 1645 } 1646 if (EnableInvokeDynamic) { 1647 env->RegisterNatives(unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod)); 1648 if (env->ExceptionOccurred()) { 1649 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1650 tty->print_cr("Warning: SDK 1.7 Unsafe.defineClass (anonymous version) not found."); 1651 } 1652 env->ExceptionClear(); 1653 } 1654 } 1655 if (EnableInvokeDynamic) { 1656 env->RegisterNatives(unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod)); 1657 if (env->ExceptionOccurred()) { 1658 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1659 tty->print_cr("Warning: SDK 1.7 LambdaForm support in Unsafe not found."); 1660 } 1661 env->ExceptionClear(); 1662 } 1663 } 1664 int status = env->RegisterNatives(unsafecls, methods, sizeof(methods)/sizeof(JNINativeMethod)); 1665 if (env->ExceptionOccurred()) { 1666 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1667 tty->print_cr("Warning: SDK 1.6 version of Unsafe not found."); 1668 } 1669 env->ExceptionClear(); 1670 // %%% For now, be backward compatible with an older class: 1671 status = env->RegisterNatives(unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod)); 1672 } 1673 if (env->ExceptionOccurred()) { 1674 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1675 tty->print_cr("Warning: SDK 1.5 version of Unsafe not found."); 1676 } 1677 env->ExceptionClear(); 1678 // %%% For now, be backward compatible with an older class: 1679 status = env->RegisterNatives(unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod)); 1680 } 1681 if (env->ExceptionOccurred()) { 1682 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1683 tty->print_cr("Warning: SDK 1.4.1 version of Unsafe not found."); 1684 } 1685 env->ExceptionClear(); 1686 // %%% For now, be backward compatible with an older class: 1687 status = env->RegisterNatives(unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod)); 1688 } 1689 guarantee(status == 0, "register unsafe natives"); 1690 } 1691JVM_END 1692