unsafe.cpp revision 342:37f87013dfd8
1/* 2 * Copyright 2000-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25/* 26 * Implementation of class sun.misc.Unsafe 27 */ 28 29#include "incls/_precompiled.incl" 30#include "incls/_unsafe.cpp.incl" 31 32#define MAX_OBJECT_SIZE \ 33 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \ 34 + ((julong)max_jint * sizeof(double)) ) 35 36 37#define UNSAFE_ENTRY(result_type, header) \ 38 JVM_ENTRY(result_type, header) 39 40// Can't use UNSAFE_LEAF because it has the signature of a straight 41// call into the runtime (just like JVM_LEAF, funny that) but it's 42// called like a Java Native and thus the wrapper built for it passes 43// arguments like a JNI call. It expects those arguments to be popped 44// from the stack on Intel like all good JNI args are, and adjusts the 45// stack according. Since the JVM_LEAF call expects no extra 46// arguments the stack isn't popped in the C code, is pushed by the 47// wrapper and we get sick. 48//#define UNSAFE_LEAF(result_type, header) \ 49// JVM_LEAF(result_type, header) 50 51#define UNSAFE_END JVM_END 52 53#define UnsafeWrapper(arg) /*nothing, for the present*/ 54 55 56inline void* addr_from_java(jlong addr) { 57 // This assert fails in a variety of ways on 32-bit systems. 58 // It is impossible to predict whether native code that converts 59 // pointers to longs will sign-extend or zero-extend the addresses. 60 //assert(addr == (uintptr_t)addr, "must not be odd high bits"); 61 return (void*)(uintptr_t)addr; 62} 63 64inline jlong addr_to_java(void* p) { 65 assert(p == (void*)(uintptr_t)p, "must not be odd high bits"); 66 return (uintptr_t)p; 67} 68 69 70// Note: The VM's obj_field and related accessors use byte-scaled 71// ("unscaled") offsets, just as the unsafe methods do. 72 73// However, the method Unsafe.fieldOffset explicitly declines to 74// guarantee this. The field offset values manipulated by the Java user 75// through the Unsafe API are opaque cookies that just happen to be byte 76// offsets. We represent this state of affairs by passing the cookies 77// through conversion functions when going between the VM and the Unsafe API. 78// The conversion functions just happen to be no-ops at present. 79 80inline jlong field_offset_to_byte_offset(jlong field_offset) { 81 return field_offset; 82} 83 84inline jlong field_offset_from_byte_offset(jlong byte_offset) { 85 return byte_offset; 86} 87 88inline jint invocation_key_from_method_slot(jint slot) { 89 return slot; 90} 91 92inline jint invocation_key_to_method_slot(jint key) { 93 return key; 94} 95 96inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) { 97 jlong byte_offset = field_offset_to_byte_offset(field_offset); 98#ifdef ASSERT 99 if (p != NULL) { 100 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset"); 101 if (byte_offset == (jint)byte_offset) { 102 void* ptr_plus_disp = (address)p + byte_offset; 103 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp, 104 "raw [ptr+disp] must be consistent with oop::field_base"); 105 } 106 } 107#endif 108 if (sizeof(char*) == sizeof(jint)) // (this constant folds!) 109 return (address)p + (jint) byte_offset; 110 else 111 return (address)p + byte_offset; 112} 113 114// Externally callable versions: 115// (Use these in compiler intrinsics which emulate unsafe primitives.) 116jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) { 117 return field_offset; 118} 119jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) { 120 return byte_offset; 121} 122jint Unsafe_invocation_key_from_method_slot(jint slot) { 123 return invocation_key_from_method_slot(slot); 124} 125jint Unsafe_invocation_key_to_method_slot(jint key) { 126 return invocation_key_to_method_slot(key); 127} 128 129 130///// Data in the Java heap. 131 132#define GET_FIELD(obj, offset, type_name, v) \ 133 oop p = JNIHandles::resolve(obj); \ 134 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset) 135 136#define SET_FIELD(obj, offset, type_name, x) \ 137 oop p = JNIHandles::resolve(obj); \ 138 *(type_name*)index_oop_from_field_offset_long(p, offset) = x 139 140#define GET_FIELD_VOLATILE(obj, offset, type_name, v) \ 141 oop p = JNIHandles::resolve(obj); \ 142 volatile type_name v = *(volatile type_name*)index_oop_from_field_offset_long(p, offset) 143 144#define SET_FIELD_VOLATILE(obj, offset, type_name, x) \ 145 oop p = JNIHandles::resolve(obj); \ 146 *(volatile type_name*)index_oop_from_field_offset_long(p, offset) = x; \ 147 OrderAccess::fence(); 148 149// Macros for oops that check UseCompressedOops 150 151#define GET_OOP_FIELD(obj, offset, v) \ 152 oop p = JNIHandles::resolve(obj); \ 153 oop v; \ 154 if (UseCompressedOops) { \ 155 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \ 156 v = oopDesc::decode_heap_oop(n); \ 157 } else { \ 158 v = *(oop*)index_oop_from_field_offset_long(p, offset); \ 159 } 160 161#define GET_OOP_FIELD_VOLATILE(obj, offset, v) \ 162 oop p = JNIHandles::resolve(obj); \ 163 volatile oop v; \ 164 if (UseCompressedOops) { \ 165 volatile narrowOop n = *(volatile narrowOop*)index_oop_from_field_offset_long(p, offset); \ 166 v = oopDesc::decode_heap_oop(n); \ 167 } else { \ 168 v = *(volatile oop*)index_oop_from_field_offset_long(p, offset); \ 169 } 170 171 172// Get/SetObject must be special-cased, since it works with handles. 173 174// The xxx140 variants for backward compatibility do not allow a full-width offset. 175UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) 176 UnsafeWrapper("Unsafe_GetObject"); 177 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); 178 GET_OOP_FIELD(obj, offset, v) 179 return JNIHandles::make_local(env, v); 180UNSAFE_END 181 182UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h)) 183 UnsafeWrapper("Unsafe_SetObject"); 184 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); 185 oop x = JNIHandles::resolve(x_h); 186 //SET_FIELD(obj, offset, oop, x); 187 oop p = JNIHandles::resolve(obj); 188 if (UseCompressedOops) { 189 if (x != NULL) { 190 // If there is a heap base pointer, we are obliged to emit a store barrier. 191 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 192 } else { 193 narrowOop n = oopDesc::encode_heap_oop_not_null(x); 194 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n; 195 } 196 } else { 197 if (x != NULL) { 198 // If there is a heap base pointer, we are obliged to emit a store barrier. 199 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 200 } else { 201 *(oop*)index_oop_from_field_offset_long(p, offset) = x; 202 } 203 } 204UNSAFE_END 205 206// The normal variants allow a null base pointer with an arbitrary address. 207// But if the base pointer is non-null, the offset should make some sense. 208// That is, it should be in the range [0, MAX_OBJECT_SIZE]. 209UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 210 UnsafeWrapper("Unsafe_GetObject"); 211 GET_OOP_FIELD(obj, offset, v) 212 return JNIHandles::make_local(env, v); 213UNSAFE_END 214 215UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 216 UnsafeWrapper("Unsafe_SetObject"); 217 oop x = JNIHandles::resolve(x_h); 218 oop p = JNIHandles::resolve(obj); 219 if (UseCompressedOops) { 220 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 221 } else { 222 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 223 } 224UNSAFE_END 225 226UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 227 UnsafeWrapper("Unsafe_GetObjectVolatile"); 228 GET_OOP_FIELD_VOLATILE(obj, offset, v) 229 return JNIHandles::make_local(env, v); 230UNSAFE_END 231 232UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 233 UnsafeWrapper("Unsafe_SetObjectVolatile"); 234 oop x = JNIHandles::resolve(x_h); 235 oop p = JNIHandles::resolve(obj); 236 if (UseCompressedOops) { 237 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 238 } else { 239 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 240 } 241 OrderAccess::fence(); 242UNSAFE_END 243 244// Volatile long versions must use locks if !VM_Version::supports_cx8(). 245// support_cx8 is a surrogate for 'supports atomic long memory ops'. 246 247UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 248 UnsafeWrapper("Unsafe_GetLongVolatile"); 249 { 250 if (VM_Version::supports_cx8()) { 251 GET_FIELD_VOLATILE(obj, offset, jlong, v); 252 return v; 253 } 254 else { 255 Handle p (THREAD, JNIHandles::resolve(obj)); 256 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 257 ObjectLocker ol(p, THREAD); 258 jlong value = *addr; 259 return value; 260 } 261 } 262UNSAFE_END 263 264UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) 265 UnsafeWrapper("Unsafe_SetLongVolatile"); 266 { 267 if (VM_Version::supports_cx8()) { 268 SET_FIELD_VOLATILE(obj, offset, jlong, x); 269 } 270 else { 271 Handle p (THREAD, JNIHandles::resolve(obj)); 272 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 273 ObjectLocker ol(p, THREAD); 274 *addr = x; 275 } 276 } 277UNSAFE_END 278 279 280#define DEFINE_GETSETOOP(jboolean, Boolean) \ 281 \ 282UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \ 283 UnsafeWrapper("Unsafe_Get"#Boolean); \ 284 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \ 285 GET_FIELD(obj, offset, jboolean, v); \ 286 return v; \ 287UNSAFE_END \ 288 \ 289UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \ 290 UnsafeWrapper("Unsafe_Set"#Boolean); \ 291 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \ 292 SET_FIELD(obj, offset, jboolean, x); \ 293UNSAFE_END \ 294 \ 295UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \ 296 UnsafeWrapper("Unsafe_Get"#Boolean); \ 297 GET_FIELD(obj, offset, jboolean, v); \ 298 return v; \ 299UNSAFE_END \ 300 \ 301UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \ 302 UnsafeWrapper("Unsafe_Set"#Boolean); \ 303 SET_FIELD(obj, offset, jboolean, x); \ 304UNSAFE_END \ 305 \ 306// END DEFINE_GETSETOOP. 307 308 309#define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \ 310 \ 311UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \ 312 UnsafeWrapper("Unsafe_Get"#Boolean); \ 313 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \ 314 return v; \ 315UNSAFE_END \ 316 \ 317UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \ 318 UnsafeWrapper("Unsafe_Set"#Boolean); \ 319 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \ 320UNSAFE_END \ 321 \ 322// END DEFINE_GETSETOOP_VOLATILE. 323 324DEFINE_GETSETOOP(jboolean, Boolean) 325DEFINE_GETSETOOP(jbyte, Byte) 326DEFINE_GETSETOOP(jshort, Short); 327DEFINE_GETSETOOP(jchar, Char); 328DEFINE_GETSETOOP(jint, Int); 329DEFINE_GETSETOOP(jlong, Long); 330DEFINE_GETSETOOP(jfloat, Float); 331DEFINE_GETSETOOP(jdouble, Double); 332 333DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) 334DEFINE_GETSETOOP_VOLATILE(jbyte, Byte) 335DEFINE_GETSETOOP_VOLATILE(jshort, Short); 336DEFINE_GETSETOOP_VOLATILE(jchar, Char); 337DEFINE_GETSETOOP_VOLATILE(jint, Int); 338// no long -- handled specially 339DEFINE_GETSETOOP_VOLATILE(jfloat, Float); 340DEFINE_GETSETOOP_VOLATILE(jdouble, Double); 341 342#undef DEFINE_GETSETOOP 343 344// The non-intrinsified versions of setOrdered just use setVolatile 345 346UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x)) \ 347 UnsafeWrapper("Unsafe_SetOrderedInt"); \ 348 SET_FIELD_VOLATILE(obj, offset, jint, x); \ 349UNSAFE_END 350 351UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 352 UnsafeWrapper("Unsafe_SetOrderedObject"); 353 oop x = JNIHandles::resolve(x_h); 354 oop p = JNIHandles::resolve(obj); 355 if (UseCompressedOops) { 356 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 357 } else { 358 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 359 } 360 OrderAccess::fence(); 361UNSAFE_END 362 363UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) 364 UnsafeWrapper("Unsafe_SetOrderedLong"); 365 { 366 if (VM_Version::supports_cx8()) { 367 SET_FIELD_VOLATILE(obj, offset, jlong, x); 368 } 369 else { 370 Handle p (THREAD, JNIHandles::resolve(obj)); 371 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 372 ObjectLocker ol(p, THREAD); 373 *addr = x; 374 } 375 } 376UNSAFE_END 377 378////// Data in the C heap. 379 380// Note: These do not throw NullPointerException for bad pointers. 381// They just crash. Only a oop base pointer can generate a NullPointerException. 382// 383#define DEFINE_GETSETNATIVE(java_type, Type, native_type) \ 384 \ 385UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \ 386 UnsafeWrapper("Unsafe_GetNative"#Type); \ 387 void* p = addr_from_java(addr); \ 388 JavaThread* t = JavaThread::current(); \ 389 t->set_doing_unsafe_access(true); \ 390 java_type x = *(volatile native_type*)p; \ 391 t->set_doing_unsafe_access(false); \ 392 return x; \ 393UNSAFE_END \ 394 \ 395UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \ 396 UnsafeWrapper("Unsafe_SetNative"#Type); \ 397 JavaThread* t = JavaThread::current(); \ 398 t->set_doing_unsafe_access(true); \ 399 void* p = addr_from_java(addr); \ 400 *(volatile native_type*)p = x; \ 401 t->set_doing_unsafe_access(false); \ 402UNSAFE_END \ 403 \ 404// END DEFINE_GETSETNATIVE. 405 406DEFINE_GETSETNATIVE(jbyte, Byte, signed char) 407DEFINE_GETSETNATIVE(jshort, Short, signed short); 408DEFINE_GETSETNATIVE(jchar, Char, unsigned short); 409DEFINE_GETSETNATIVE(jint, Int, jint); 410// no long -- handled specially 411DEFINE_GETSETNATIVE(jfloat, Float, float); 412DEFINE_GETSETNATIVE(jdouble, Double, double); 413 414#undef DEFINE_GETSETNATIVE 415 416UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr)) 417 UnsafeWrapper("Unsafe_GetNativeLong"); 418 JavaThread* t = JavaThread::current(); 419 // We do it this way to avoid problems with access to heap using 64 420 // bit loads, as jlong in heap could be not 64-bit aligned, and on 421 // some CPUs (SPARC) it leads to SIGBUS. 422 t->set_doing_unsafe_access(true); 423 void* p = addr_from_java(addr); 424 jlong x; 425 if (((intptr_t)p & 7) == 0) { 426 // jlong is aligned, do a volatile access 427 x = *(volatile jlong*)p; 428 } else { 429 jlong_accessor acc; 430 acc.words[0] = ((volatile jint*)p)[0]; 431 acc.words[1] = ((volatile jint*)p)[1]; 432 x = acc.long_value; 433 } 434 t->set_doing_unsafe_access(false); 435 return x; 436UNSAFE_END 437 438UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 439 UnsafeWrapper("Unsafe_SetNativeLong"); 440 JavaThread* t = JavaThread::current(); 441 // see comment for Unsafe_GetNativeLong 442 t->set_doing_unsafe_access(true); 443 void* p = addr_from_java(addr); 444 if (((intptr_t)p & 7) == 0) { 445 // jlong is aligned, do a volatile access 446 *(volatile jlong*)p = x; 447 } else { 448 jlong_accessor acc; 449 acc.long_value = x; 450 ((volatile jint*)p)[0] = acc.words[0]; 451 ((volatile jint*)p)[1] = acc.words[1]; 452 } 453 t->set_doing_unsafe_access(false); 454UNSAFE_END 455 456 457UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr)) 458 UnsafeWrapper("Unsafe_GetNativeAddress"); 459 void* p = addr_from_java(addr); 460 return addr_to_java(*(void**)p); 461UNSAFE_END 462 463UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 464 UnsafeWrapper("Unsafe_SetNativeAddress"); 465 void* p = addr_from_java(addr); 466 *(void**)p = addr_from_java(x); 467UNSAFE_END 468 469 470////// Allocation requests 471 472UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls)) 473 UnsafeWrapper("Unsafe_AllocateInstance"); 474 { 475 ThreadToNativeFromVM ttnfv(thread); 476 return env->AllocObject(cls); 477 } 478UNSAFE_END 479 480UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size)) 481 UnsafeWrapper("Unsafe_AllocateMemory"); 482 size_t sz = (size_t)size; 483 if (sz != (julong)size || size < 0) { 484 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 485 } 486 if (sz == 0) { 487 return 0; 488 } 489 sz = round_to(sz, HeapWordSize); 490 void* x = os::malloc(sz); 491 if (x == NULL) { 492 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 493 } 494 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize); 495 return addr_to_java(x); 496UNSAFE_END 497 498UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size)) 499 UnsafeWrapper("Unsafe_ReallocateMemory"); 500 void* p = addr_from_java(addr); 501 size_t sz = (size_t)size; 502 if (sz != (julong)size || size < 0) { 503 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 504 } 505 if (sz == 0) { 506 os::free(p); 507 return 0; 508 } 509 sz = round_to(sz, HeapWordSize); 510 void* x = (p == NULL) ? os::malloc(sz) : os::realloc(p, sz); 511 if (x == NULL) { 512 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 513 } 514 return addr_to_java(x); 515UNSAFE_END 516 517UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr)) 518 UnsafeWrapper("Unsafe_FreeMemory"); 519 void* p = addr_from_java(addr); 520 if (p == NULL) { 521 return; 522 } 523 os::free(p); 524UNSAFE_END 525 526UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value)) 527 UnsafeWrapper("Unsafe_SetMemory"); 528 size_t sz = (size_t)size; 529 if (sz != (julong)size || size < 0) { 530 THROW(vmSymbols::java_lang_IllegalArgumentException()); 531 } 532 char* p = (char*) addr_from_java(addr); 533 Copy::fill_to_memory_atomic(p, sz, value); 534UNSAFE_END 535 536UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value)) 537 UnsafeWrapper("Unsafe_SetMemory"); 538 size_t sz = (size_t)size; 539 if (sz != (julong)size || size < 0) { 540 THROW(vmSymbols::java_lang_IllegalArgumentException()); 541 } 542 oop base = JNIHandles::resolve(obj); 543 void* p = index_oop_from_field_offset_long(base, offset); 544 Copy::fill_to_memory_atomic(p, sz, value); 545UNSAFE_END 546 547UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size)) 548 UnsafeWrapper("Unsafe_CopyMemory"); 549 if (size == 0) { 550 return; 551 } 552 size_t sz = (size_t)size; 553 if (sz != (julong)size || size < 0) { 554 THROW(vmSymbols::java_lang_IllegalArgumentException()); 555 } 556 void* src = addr_from_java(srcAddr); 557 void* dst = addr_from_java(dstAddr); 558 Copy::conjoint_memory_atomic(src, dst, sz); 559UNSAFE_END 560 561UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size)) 562 UnsafeWrapper("Unsafe_CopyMemory"); 563 if (size == 0) { 564 return; 565 } 566 size_t sz = (size_t)size; 567 if (sz != (julong)size || size < 0) { 568 THROW(vmSymbols::java_lang_IllegalArgumentException()); 569 } 570 oop srcp = JNIHandles::resolve(srcObj); 571 oop dstp = JNIHandles::resolve(dstObj); 572 if (dstp != NULL && !dstp->is_typeArray()) { 573 // NYI: This works only for non-oop arrays at present. 574 // Generalizing it would be reasonable, but requires card marking. 575 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad. 576 THROW(vmSymbols::java_lang_IllegalArgumentException()); 577 } 578 void* src = index_oop_from_field_offset_long(srcp, srcOffset); 579 void* dst = index_oop_from_field_offset_long(dstp, dstOffset); 580 Copy::conjoint_memory_atomic(src, dst, sz); 581UNSAFE_END 582 583 584////// Random queries 585 586// See comment at file start about UNSAFE_LEAF 587//UNSAFE_LEAF(jint, Unsafe_AddressSize()) 588UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe)) 589 UnsafeWrapper("Unsafe_AddressSize"); 590 return sizeof(void*); 591UNSAFE_END 592 593// See comment at file start about UNSAFE_LEAF 594//UNSAFE_LEAF(jint, Unsafe_PageSize()) 595UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe)) 596 UnsafeWrapper("Unsafe_PageSize"); 597 return os::vm_page_size(); 598UNSAFE_END 599 600jint find_field_offset(jobject field, int must_be_static, TRAPS) { 601 if (field == NULL) { 602 THROW_0(vmSymbols::java_lang_NullPointerException()); 603 } 604 605 oop reflected = JNIHandles::resolve_non_null(field); 606 oop mirror = java_lang_reflect_Field::clazz(reflected); 607 klassOop k = java_lang_Class::as_klassOop(mirror); 608 int slot = java_lang_reflect_Field::slot(reflected); 609 int modifiers = java_lang_reflect_Field::modifiers(reflected); 610 611 if (must_be_static >= 0) { 612 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0); 613 if (must_be_static != really_is_static) { 614 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 615 } 616 } 617 618 int offset = instanceKlass::cast(k)->offset_from_fields(slot); 619 return field_offset_from_byte_offset(offset); 620} 621 622UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 623 UnsafeWrapper("Unsafe_ObjectFieldOffset"); 624 return find_field_offset(field, 0, THREAD); 625UNSAFE_END 626 627UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 628 UnsafeWrapper("Unsafe_StaticFieldOffset"); 629 return find_field_offset(field, 1, THREAD); 630UNSAFE_END 631 632UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field)) 633 UnsafeWrapper("Unsafe_StaticFieldBase"); 634 // Note: In this VM implementation, a field address is always a short 635 // offset from the base of a a klass metaobject. Thus, the full dynamic 636 // range of the return type is never used. However, some implementations 637 // might put the static field inside an array shared by many classes, 638 // or even at a fixed address, in which case the address could be quite 639 // large. In that last case, this function would return NULL, since 640 // the address would operate alone, without any base pointer. 641 642 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); 643 644 oop reflected = JNIHandles::resolve_non_null(field); 645 oop mirror = java_lang_reflect_Field::clazz(reflected); 646 int modifiers = java_lang_reflect_Field::modifiers(reflected); 647 648 if ((modifiers & JVM_ACC_STATIC) == 0) { 649 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 650 } 651 652 return JNIHandles::make_local(env, java_lang_Class::as_klassOop(mirror)); 653UNSAFE_END 654 655//@deprecated 656UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 657 UnsafeWrapper("Unsafe_FieldOffset"); 658 // tries (but fails) to be polymorphic between static and non-static: 659 jlong offset = find_field_offset(field, -1, THREAD); 660 guarantee(offset == (jint)offset, "offset fits in 32 bits"); 661 return (jint)offset; 662UNSAFE_END 663 664//@deprecated 665UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz)) 666 UnsafeWrapper("Unsafe_StaticFieldBase"); 667 if (clazz == NULL) { 668 THROW_0(vmSymbols::java_lang_NullPointerException()); 669 } 670 return JNIHandles::make_local(env, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz))); 671UNSAFE_END 672 673UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) 674 UnsafeWrapper("Unsafe_EnsureClassInitialized"); 675 if (clazz == NULL) { 676 THROW(vmSymbols::java_lang_NullPointerException()); 677 } 678 oop mirror = JNIHandles::resolve_non_null(clazz); 679 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(mirror)); 680 if (k != NULL) { 681 k->initialize(CHECK); 682 } 683UNSAFE_END 684 685static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) { 686 if (acls == NULL) { 687 THROW(vmSymbols::java_lang_NullPointerException()); 688 } 689 oop mirror = JNIHandles::resolve_non_null(acls); 690 klassOop k = java_lang_Class::as_klassOop(mirror); 691 if (k == NULL || !k->klass_part()->oop_is_array()) { 692 THROW(vmSymbols::java_lang_InvalidClassException()); 693 } else if (k->klass_part()->oop_is_objArray()) { 694 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT); 695 scale = heapOopSize; 696 } else if (k->klass_part()->oop_is_typeArray()) { 697 typeArrayKlass* tak = typeArrayKlass::cast(k); 698 base = tak->array_header_in_bytes(); 699 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok"); 700 scale = (1 << tak->log2_element_size()); 701 } else { 702 ShouldNotReachHere(); 703 } 704} 705 706UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls)) 707 UnsafeWrapper("Unsafe_ArrayBaseOffset"); 708 int base, scale; 709 getBaseAndScale(base, scale, acls, CHECK_0); 710 return field_offset_from_byte_offset(base); 711UNSAFE_END 712 713 714UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls)) 715 UnsafeWrapper("Unsafe_ArrayIndexScale"); 716 int base, scale; 717 getBaseAndScale(base, scale, acls, CHECK_0); 718 // This VM packs both fields and array elements down to the byte. 719 // But watch out: If this changes, so that array references for 720 // a given primitive type (say, T_BOOLEAN) use different memory units 721 // than fields, this method MUST return zero for such arrays. 722 // For example, the VM used to store sub-word sized fields in full 723 // words in the object layout, so that accessors like getByte(Object,int) 724 // did not really do what one might expect for arrays. Therefore, 725 // this function used to report a zero scale factor, so that the user 726 // would know not to attempt to access sub-word array elements. 727 // // Code for unpacked fields: 728 // if (scale < wordSize) return 0; 729 730 // The following allows for a pretty general fieldOffset cookie scheme, 731 // but requires it to be linear in byte offset. 732 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0); 733UNSAFE_END 734 735 736static inline void throw_new(JNIEnv *env, const char *ename) { 737 char buf[100]; 738 strcpy(buf, "java/lang/"); 739 strcat(buf, ename); 740 jclass cls = env->FindClass(buf); 741 char* msg = NULL; 742 env->ThrowNew(cls, msg); 743} 744 745static jclass Unsafe_DefineClass(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) { 746 { 747 // Code lifted from JDK 1.3 ClassLoader.c 748 749 jbyte *body; 750 char *utfName; 751 jclass result = 0; 752 char buf[128]; 753 754 if (UsePerfData) { 755 ClassLoader::unsafe_defineClassCallCounter()->inc(); 756 } 757 758 if (data == NULL) { 759 throw_new(env, "NullPointerException"); 760 return 0; 761 } 762 763 /* Work around 4153825. malloc crashes on Solaris when passed a 764 * negative size. 765 */ 766 if (length < 0) { 767 throw_new(env, "ArrayIndexOutOfBoundsException"); 768 return 0; 769 } 770 771 body = NEW_C_HEAP_ARRAY(jbyte, length); 772 773 if (body == 0) { 774 throw_new(env, "OutOfMemoryError"); 775 return 0; 776 } 777 778 env->GetByteArrayRegion(data, offset, length, body); 779 780 if (env->ExceptionOccurred()) 781 goto free_body; 782 783 if (name != NULL) { 784 uint len = env->GetStringUTFLength(name); 785 int unicode_len = env->GetStringLength(name); 786 if (len >= sizeof(buf)) { 787 utfName = NEW_C_HEAP_ARRAY(char, len + 1); 788 if (utfName == NULL) { 789 throw_new(env, "OutOfMemoryError"); 790 goto free_body; 791 } 792 } else { 793 utfName = buf; 794 } 795 env->GetStringUTFRegion(name, 0, unicode_len, utfName); 796 //VerifyFixClassname(utfName); 797 for (uint i = 0; i < len; i++) { 798 if (utfName[i] == '.') utfName[i] = '/'; 799 } 800 } else { 801 utfName = NULL; 802 } 803 804 result = JVM_DefineClass(env, utfName, loader, body, length, pd); 805 806 if (utfName && utfName != buf) 807 FREE_C_HEAP_ARRAY(char, utfName); 808 809 free_body: 810 FREE_C_HEAP_ARRAY(jbyte, body); 811 return result; 812 } 813} 814 815 816UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length)) 817 UnsafeWrapper("Unsafe_DefineClass"); 818 { 819 ThreadToNativeFromVM ttnfv(thread); 820 821 int depthFromDefineClass0 = 1; 822 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0); 823 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller); 824 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller); 825 826 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd); 827 } 828UNSAFE_END 829 830 831UNSAFE_ENTRY(jclass, Unsafe_DefineClass1(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd)) 832 UnsafeWrapper("Unsafe_DefineClass"); 833 { 834 ThreadToNativeFromVM ttnfv(thread); 835 836 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd); 837 } 838UNSAFE_END 839 840 841UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 842 UnsafeWrapper("Unsafe_MonitorEnter"); 843 { 844 if (jobj == NULL) { 845 THROW(vmSymbols::java_lang_NullPointerException()); 846 } 847 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 848 ObjectSynchronizer::jni_enter(obj, CHECK); 849 } 850UNSAFE_END 851 852 853UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 854 UnsafeWrapper("Unsafe_TryMonitorEnter"); 855 { 856 if (jobj == NULL) { 857 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 858 } 859 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 860 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0); 861 return (res ? JNI_TRUE : JNI_FALSE); 862 } 863UNSAFE_END 864 865 866UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj)) 867 UnsafeWrapper("Unsafe_MonitorExit"); 868 { 869 if (jobj == NULL) { 870 THROW(vmSymbols::java_lang_NullPointerException()); 871 } 872 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj)); 873 ObjectSynchronizer::jni_exit(obj(), CHECK); 874 } 875UNSAFE_END 876 877 878UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr)) 879 UnsafeWrapper("Unsafe_ThrowException"); 880 { 881 ThreadToNativeFromVM ttnfv(thread); 882 env->Throw(thr); 883 } 884UNSAFE_END 885 886// JSR166 ------------------------------------------------------------------ 887 888UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h)) 889 UnsafeWrapper("Unsafe_CompareAndSwapObject"); 890 oop x = JNIHandles::resolve(x_h); 891 oop e = JNIHandles::resolve(e_h); 892 oop p = JNIHandles::resolve(obj); 893 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset); 894 update_barrier_set_pre((void*)addr, e); 895 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e); 896 jboolean success = (res == e); 897 if (success) 898 update_barrier_set((void*)addr, x); 899 return success; 900UNSAFE_END 901 902UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x)) 903 UnsafeWrapper("Unsafe_CompareAndSwapInt"); 904 oop p = JNIHandles::resolve(obj); 905 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset); 906 return (jint)(Atomic::cmpxchg(x, addr, e)) == e; 907UNSAFE_END 908 909UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x)) 910 UnsafeWrapper("Unsafe_CompareAndSwapLong"); 911 Handle p (THREAD, JNIHandles::resolve(obj)); 912 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 913 if (VM_Version::supports_cx8()) 914 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e; 915 else { 916 jboolean success = false; 917 ObjectLocker ol(p, THREAD); 918 if (*addr == e) { *addr = x; success = true; } 919 return success; 920 } 921UNSAFE_END 922 923UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time)) 924 UnsafeWrapper("Unsafe_Park"); 925 JavaThreadParkedState jtps(thread, time != 0); 926 thread->parker()->park(isAbsolute != 0, time); 927UNSAFE_END 928 929UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread)) 930 UnsafeWrapper("Unsafe_Unpark"); 931 Parker* p = NULL; 932 if (jthread != NULL) { 933 oop java_thread = JNIHandles::resolve_non_null(jthread); 934 if (java_thread != NULL) { 935 jlong lp = java_lang_Thread::park_event(java_thread); 936 if (lp != 0) { 937 // This cast is OK even though the jlong might have been read 938 // non-atomically on 32bit systems, since there, one word will 939 // always be zero anyway and the value set is always the same 940 p = (Parker*)addr_from_java(lp); 941 } else { 942 // Grab lock if apparently null or using older version of library 943 MutexLocker mu(Threads_lock); 944 java_thread = JNIHandles::resolve_non_null(jthread); 945 if (java_thread != NULL) { 946 JavaThread* thr = java_lang_Thread::thread(java_thread); 947 if (thr != NULL) { 948 p = thr->parker(); 949 if (p != NULL) { // Bind to Java thread for next time. 950 java_lang_Thread::set_park_event(java_thread, addr_to_java(p)); 951 } 952 } 953 } 954 } 955 } 956 } 957 if (p != NULL) { 958 p->unpark(); 959 } 960UNSAFE_END 961 962UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem)) 963 UnsafeWrapper("Unsafe_Loadavg"); 964 const int max_nelem = 3; 965 double la[max_nelem]; 966 jint ret; 967 968 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg)); 969 assert(a->is_typeArray(), "must be type array"); 970 971 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) { 972 ThreadToNativeFromVM ttnfv(thread); 973 throw_new(env, "ArrayIndexOutOfBoundsException"); 974 return -1; 975 } 976 977 ret = os::loadavg(la, nelem); 978 if (ret == -1) return -1; 979 980 // if successful, ret is the number of samples actually retrieved. 981 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value"); 982 switch(ret) { 983 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through 984 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through 985 case 1: a->double_at_put(0, (jdouble)la[0]); break; 986 } 987 return ret; 988UNSAFE_END 989 990UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 991 UnsafeWrapper("Unsafe_PrefetchRead"); 992 oop p = JNIHandles::resolve(obj); 993 void* addr = index_oop_from_field_offset_long(p, 0); 994 Prefetch::read(addr, (intx)offset); 995UNSAFE_END 996 997UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 998 UnsafeWrapper("Unsafe_PrefetchWrite"); 999 oop p = JNIHandles::resolve(obj); 1000 void* addr = index_oop_from_field_offset_long(p, 0); 1001 Prefetch::write(addr, (intx)offset); 1002UNSAFE_END 1003 1004 1005/// JVM_RegisterUnsafeMethods 1006 1007#define ADR "J" 1008 1009#define LANG "Ljava/lang/" 1010 1011#define OBJ LANG"Object;" 1012#define CLS LANG"Class;" 1013#define CTR LANG"reflect/Constructor;" 1014#define FLD LANG"reflect/Field;" 1015#define MTH LANG"reflect/Method;" 1016#define THR LANG"Throwable;" 1017 1018#define DC0_Args LANG"String;[BII" 1019#define DC1_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;" 1020 1021#define CC (char*) /*cast a literal from (const char*)*/ 1022#define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1023 1024// define deprecated accessors for compabitility with 1.4.0 1025#define DECLARE_GETSETOOP_140(Boolean, Z) \ 1026 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \ 1027 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)} 1028 1029// Note: In 1.4.1, getObject and kin take both int and long offsets. 1030#define DECLARE_GETSETOOP_141(Boolean, Z) \ 1031 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1032 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)} 1033 1034// Note: In 1.5.0, there are volatile versions too 1035#define DECLARE_GETSETOOP(Boolean, Z) \ 1036 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1037 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \ 1038 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \ 1039 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)} 1040 1041 1042#define DECLARE_GETSETNATIVE(Byte, B) \ 1043 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \ 1044 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)} 1045 1046 1047 1048// %%% These are temporarily supported until the SDK sources 1049// contain the necessarily updated Unsafe.java. 1050static JNINativeMethod methods_140[] = { 1051 1052 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)}, 1053 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)}, 1054 1055 DECLARE_GETSETOOP_140(Boolean, Z), 1056 DECLARE_GETSETOOP_140(Byte, B), 1057 DECLARE_GETSETOOP_140(Short, S), 1058 DECLARE_GETSETOOP_140(Char, C), 1059 DECLARE_GETSETOOP_140(Int, I), 1060 DECLARE_GETSETOOP_140(Long, J), 1061 DECLARE_GETSETOOP_140(Float, F), 1062 DECLARE_GETSETOOP_140(Double, D), 1063 1064 DECLARE_GETSETNATIVE(Byte, B), 1065 DECLARE_GETSETNATIVE(Short, S), 1066 DECLARE_GETSETNATIVE(Char, C), 1067 DECLARE_GETSETNATIVE(Int, I), 1068 DECLARE_GETSETNATIVE(Long, J), 1069 DECLARE_GETSETNATIVE(Float, F), 1070 DECLARE_GETSETNATIVE(Double, D), 1071 1072 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1073 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1074 1075 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1076 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1077// {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1078// {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}, 1079 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1080 1081 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, //deprecated 1082 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, //deprecated 1083 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1084 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1085 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1086 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1087 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1088 1089 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1090 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)}, 1091 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1092 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1093 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1094 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)} 1095}; 1096 1097// These are the old methods prior to the JSR 166 changes in 1.5.0 1098static JNINativeMethod methods_141[] = { 1099 1100 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1101 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1102 1103 DECLARE_GETSETOOP_141(Boolean, Z), 1104 DECLARE_GETSETOOP_141(Byte, B), 1105 DECLARE_GETSETOOP_141(Short, S), 1106 DECLARE_GETSETOOP_141(Char, C), 1107 DECLARE_GETSETOOP_141(Int, I), 1108 DECLARE_GETSETOOP_141(Long, J), 1109 DECLARE_GETSETOOP_141(Float, F), 1110 DECLARE_GETSETOOP_141(Double, D), 1111 1112 DECLARE_GETSETNATIVE(Byte, B), 1113 DECLARE_GETSETNATIVE(Short, S), 1114 DECLARE_GETSETNATIVE(Char, C), 1115 DECLARE_GETSETNATIVE(Int, I), 1116 DECLARE_GETSETNATIVE(Long, J), 1117 DECLARE_GETSETNATIVE(Float, F), 1118 DECLARE_GETSETNATIVE(Double, D), 1119 1120 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1121 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1122 1123 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1124 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1125// {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1126// {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}, 1127 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1128 1129 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1130 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1131 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1132 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1133 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1134 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1135 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1136 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1137 1138 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1139 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)}, 1140 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1141 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1142 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1143 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)} 1144 1145}; 1146 1147// These are the old methods prior to the JSR 166 changes in 1.6.0 1148static JNINativeMethod methods_15[] = { 1149 1150 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1151 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1152 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1153 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1154 1155 1156 DECLARE_GETSETOOP(Boolean, Z), 1157 DECLARE_GETSETOOP(Byte, B), 1158 DECLARE_GETSETOOP(Short, S), 1159 DECLARE_GETSETOOP(Char, C), 1160 DECLARE_GETSETOOP(Int, I), 1161 DECLARE_GETSETOOP(Long, J), 1162 DECLARE_GETSETOOP(Float, F), 1163 DECLARE_GETSETOOP(Double, D), 1164 1165 DECLARE_GETSETNATIVE(Byte, B), 1166 DECLARE_GETSETNATIVE(Short, S), 1167 DECLARE_GETSETNATIVE(Char, C), 1168 DECLARE_GETSETNATIVE(Int, I), 1169 DECLARE_GETSETNATIVE(Long, J), 1170 DECLARE_GETSETNATIVE(Float, F), 1171 DECLARE_GETSETNATIVE(Double, D), 1172 1173 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1174 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1175 1176 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1177 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1178// {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1179// {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}, 1180 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1181 1182 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1183 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1184 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1185 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1186 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1187 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1188 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1189 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1190 1191 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1192 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)}, 1193 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1194 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1195 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1196 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1197 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1198 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1199 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1200 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1201 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1202 1203}; 1204 1205// These are the correct methods, moving forward: 1206static JNINativeMethod methods[] = { 1207 1208 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1209 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1210 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1211 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1212 1213 1214 DECLARE_GETSETOOP(Boolean, Z), 1215 DECLARE_GETSETOOP(Byte, B), 1216 DECLARE_GETSETOOP(Short, S), 1217 DECLARE_GETSETOOP(Char, C), 1218 DECLARE_GETSETOOP(Int, I), 1219 DECLARE_GETSETOOP(Long, J), 1220 DECLARE_GETSETOOP(Float, F), 1221 DECLARE_GETSETOOP(Double, D), 1222 1223 DECLARE_GETSETNATIVE(Byte, B), 1224 DECLARE_GETSETNATIVE(Short, S), 1225 DECLARE_GETSETNATIVE(Char, C), 1226 DECLARE_GETSETNATIVE(Int, I), 1227 DECLARE_GETSETNATIVE(Long, J), 1228 DECLARE_GETSETNATIVE(Float, F), 1229 DECLARE_GETSETNATIVE(Double, D), 1230 1231 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1232 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1233 1234 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1235 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1236// {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1237// {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}, 1238 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1239 1240 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1241 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1242 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1243 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1244 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1245 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1246 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1247 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1248 1249 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1250 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)}, 1251 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1252 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1253 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1254 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)}, 1255 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1256 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1257 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1258 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1259 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)}, 1260 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)}, 1261 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)}, 1262 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1263 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1264 1265// {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}, 1266 1267// {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1268// {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)} 1269// {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1270// {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)} 1271 1272}; 1273 1274JNINativeMethod loadavg_method[] = { 1275 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)} 1276}; 1277 1278JNINativeMethod prefetch_methods[] = { 1279 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1280 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}, 1281 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1282 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)} 1283}; 1284 1285JNINativeMethod memcopy_methods[] = { 1286 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)}, 1287 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)} 1288}; 1289 1290JNINativeMethod memcopy_methods_15[] = { 1291 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1292 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)} 1293}; 1294 1295 1296#undef CC 1297#undef FN_PTR 1298 1299#undef ADR 1300#undef LANG 1301#undef OBJ 1302#undef CLS 1303#undef CTR 1304#undef FLD 1305#undef MTH 1306#undef THR 1307#undef DC0_Args 1308#undef DC1_Args 1309 1310#undef DECLARE_GETSETOOP 1311#undef DECLARE_GETSETNATIVE 1312 1313 1314// This one function is exported, used by NativeLookup. 1315// The Unsafe_xxx functions above are called only from the interpreter. 1316// The optimizer looks at names and signatures to recognize 1317// individual functions. 1318 1319JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls)) 1320 UnsafeWrapper("JVM_RegisterUnsafeMethods"); 1321 { 1322 ThreadToNativeFromVM ttnfv(thread); 1323 { 1324 env->RegisterNatives(unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod)); 1325 if (env->ExceptionOccurred()) { 1326 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1327 tty->print_cr("Warning: SDK 1.6 Unsafe.loadavg not found."); 1328 } 1329 env->ExceptionClear(); 1330 } 1331 } 1332 { 1333 env->RegisterNatives(unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod)); 1334 if (env->ExceptionOccurred()) { 1335 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1336 tty->print_cr("Warning: SDK 1.6 Unsafe.prefetchRead/Write not found."); 1337 } 1338 env->ExceptionClear(); 1339 } 1340 } 1341 { 1342 env->RegisterNatives(unsafecls, memcopy_methods, sizeof(memcopy_methods)/sizeof(JNINativeMethod)); 1343 if (env->ExceptionOccurred()) { 1344 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1345 tty->print_cr("Warning: SDK 1.7 Unsafe.copyMemory not found."); 1346 } 1347 env->ExceptionClear(); 1348 env->RegisterNatives(unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod)); 1349 if (env->ExceptionOccurred()) { 1350 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1351 tty->print_cr("Warning: SDK 1.5 Unsafe.copyMemory not found."); 1352 } 1353 env->ExceptionClear(); 1354 } 1355 } 1356 } 1357 int status = env->RegisterNatives(unsafecls, methods, sizeof(methods)/sizeof(JNINativeMethod)); 1358 if (env->ExceptionOccurred()) { 1359 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1360 tty->print_cr("Warning: SDK 1.6 version of Unsafe not found."); 1361 } 1362 env->ExceptionClear(); 1363 // %%% For now, be backward compatible with an older class: 1364 status = env->RegisterNatives(unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod)); 1365 } 1366 if (env->ExceptionOccurred()) { 1367 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1368 tty->print_cr("Warning: SDK 1.5 version of Unsafe not found."); 1369 } 1370 env->ExceptionClear(); 1371 // %%% For now, be backward compatible with an older class: 1372 status = env->RegisterNatives(unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod)); 1373 } 1374 if (env->ExceptionOccurred()) { 1375 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1376 tty->print_cr("Warning: SDK 1.4.1 version of Unsafe not found."); 1377 } 1378 env->ExceptionClear(); 1379 // %%% For now, be backward compatible with an older class: 1380 status = env->RegisterNatives(unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod)); 1381 } 1382 guarantee(status == 0, "register unsafe natives"); 1383 } 1384JVM_END 1385