1 /* 2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/vmSymbols.hpp" 27 #include "memory/allocation.inline.hpp" 28 #include "prims/jni.h" 29 #include "prims/jvm.h" 30 #include "runtime/globals.hpp" 31 #include "runtime/interfaceSupport.hpp" 32 #include "runtime/reflection.hpp" 33 #include "runtime/reflectionCompat.hpp" 34 #include "runtime/synchronizer.hpp" 35 #include "services/threadService.hpp" 36 #include "utilities/copy.hpp" 37 #include "utilities/dtrace.hpp" 38 39 /* 40 * Implementation of class sun.misc.Unsafe 41 */ 42 43 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long); 44 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t); 45 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t); 46 47 #define MAX_OBJECT_SIZE \ 48 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \ 49 + ((julong)max_jint * sizeof(double)) ) 50 51 52 #define UNSAFE_ENTRY(result_type, header) \ 53 JVM_ENTRY(result_type, header) 54 55 // Can't use UNSAFE_LEAF because it has the signature of a straight 56 // call into the runtime (just like JVM_LEAF, funny that) but it's 57 // called like a Java Native and thus the wrapper built for it passes 58 // arguments like a JNI call. It expects those arguments to be popped 59 // from the stack on Intel like all good JNI args are, and adjusts the 60 // stack according. Since the JVM_LEAF call expects no extra 61 // arguments the stack isn't popped in the C code, is pushed by the 62 // wrapper and we get sick. 63 //#define UNSAFE_LEAF(result_type, header) \ 64 // JVM_LEAF(result_type, header) 65 66 #define UNSAFE_END JVM_END 67 68 #define UnsafeWrapper(arg) /*nothing, for the present*/ 69 70 71 inline void* addr_from_java(jlong addr) { 72 // This assert fails in a variety of ways on 32-bit systems. 73 // It is impossible to predict whether native code that converts 74 // pointers to longs will sign-extend or zero-extend the addresses. 75 //assert(addr == (uintptr_t)addr, "must not be odd high bits"); 76 return (void*)(uintptr_t)addr; 77 } 78 79 inline jlong addr_to_java(void* p) { 80 assert(p == (void*)(uintptr_t)p, "must not be odd high bits"); 81 return (uintptr_t)p; 82 } 83 84 85 // Note: The VM's obj_field and related accessors use byte-scaled 86 // ("unscaled") offsets, just as the unsafe methods do. 87 88 // However, the method Unsafe.fieldOffset explicitly declines to 89 // guarantee this. The field offset values manipulated by the Java user 90 // through the Unsafe API are opaque cookies that just happen to be byte 91 // offsets. We represent this state of affairs by passing the cookies 92 // through conversion functions when going between the VM and the Unsafe API. 93 // The conversion functions just happen to be no-ops at present. 94 95 inline jlong field_offset_to_byte_offset(jlong field_offset) { 96 return field_offset; 97 } 98 99 inline jlong field_offset_from_byte_offset(jlong byte_offset) { 100 return byte_offset; 101 } 102 103 inline jint invocation_key_from_method_slot(jint slot) { 104 return slot; 105 } 106 107 inline jint invocation_key_to_method_slot(jint key) { 108 return key; 109 } 110 111 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) { 112 jlong byte_offset = field_offset_to_byte_offset(field_offset); 113 #ifdef ASSERT 114 if (p != NULL) { 115 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset"); 116 if (byte_offset == (jint)byte_offset) { 117 void* ptr_plus_disp = (address)p + byte_offset; 118 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp, 119 "raw [ptr+disp] must be consistent with oop::field_base"); 120 } 121 } 122 #endif 123 if (sizeof(char*) == sizeof(jint)) // (this constant folds!) 124 return (address)p + (jint) byte_offset; 125 else 126 return (address)p + byte_offset; 127 } 128 129 // Externally callable versions: 130 // (Use these in compiler intrinsics which emulate unsafe primitives.) 131 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) { 132 return field_offset; 133 } 134 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) { 135 return byte_offset; 136 } 137 jint Unsafe_invocation_key_from_method_slot(jint slot) { 138 return invocation_key_from_method_slot(slot); 139 } 140 jint Unsafe_invocation_key_to_method_slot(jint key) { 141 return invocation_key_to_method_slot(key); 142 } 143 144 145 ///// Data in the Java heap. 146 147 #define GET_FIELD(obj, offset, type_name, v) \ 148 oop p = JNIHandles::resolve(obj); \ 149 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset) 150 151 #define SET_FIELD(obj, offset, type_name, x) \ 152 oop p = JNIHandles::resolve(obj); \ 153 *(type_name*)index_oop_from_field_offset_long(p, offset) = x 154 155 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \ 156 oop p = JNIHandles::resolve(obj); \ 157 volatile type_name v = *(volatile type_name*)index_oop_from_field_offset_long(p, offset) 158 159 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \ 160 oop p = JNIHandles::resolve(obj); \ 161 *(volatile type_name*)index_oop_from_field_offset_long(p, offset) = x; \ 162 OrderAccess::fence(); 163 164 // Macros for oops that check UseCompressedOops 165 166 #define GET_OOP_FIELD(obj, offset, v) \ 167 oop p = JNIHandles::resolve(obj); \ 168 oop v; \ 169 if (UseCompressedOops) { \ 170 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \ 171 v = oopDesc::decode_heap_oop(n); \ 172 } else { \ 173 v = *(oop*)index_oop_from_field_offset_long(p, offset); \ 174 } 175 176 #define GET_OOP_FIELD_VOLATILE(obj, offset, v) \ 177 oop p = JNIHandles::resolve(obj); \ 178 volatile oop v; \ 179 if (UseCompressedOops) { \ 180 volatile narrowOop n = *(volatile narrowOop*)index_oop_from_field_offset_long(p, offset); \ 181 v = oopDesc::decode_heap_oop(n); \ 182 } else { \ 183 v = *(volatile oop*)index_oop_from_field_offset_long(p, offset); \ 184 } 185 186 187 // Get/SetObject must be special-cased, since it works with handles. 188 189 // The xxx140 variants for backward compatibility do not allow a full-width offset. 190 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) 191 UnsafeWrapper("Unsafe_GetObject"); 192 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); 193 GET_OOP_FIELD(obj, offset, v) 194 return JNIHandles::make_local(env, v); 195 UNSAFE_END 196 197 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h)) 198 UnsafeWrapper("Unsafe_SetObject"); 199 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); 200 oop x = JNIHandles::resolve(x_h); 201 //SET_FIELD(obj, offset, oop, x); 202 oop p = JNIHandles::resolve(obj); 203 if (UseCompressedOops) { 204 if (x != NULL) { 205 // If there is a heap base pointer, we are obliged to emit a store barrier. 206 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 207 } else { 208 narrowOop n = oopDesc::encode_heap_oop_not_null(x); 209 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n; 210 } 211 } else { 212 if (x != NULL) { 213 // If there is a heap base pointer, we are obliged to emit a store barrier. 214 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 215 } else { 216 *(oop*)index_oop_from_field_offset_long(p, offset) = x; 217 } 218 } 219 UNSAFE_END 220 221 // The normal variants allow a null base pointer with an arbitrary address. 222 // But if the base pointer is non-null, the offset should make some sense. 223 // That is, it should be in the range [0, MAX_OBJECT_SIZE]. 224 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 225 UnsafeWrapper("Unsafe_GetObject"); 226 GET_OOP_FIELD(obj, offset, v) 227 return JNIHandles::make_local(env, v); 228 UNSAFE_END 229 230 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 231 UnsafeWrapper("Unsafe_SetObject"); 232 oop x = JNIHandles::resolve(x_h); 233 oop p = JNIHandles::resolve(obj); 234 if (UseCompressedOops) { 235 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 236 } else { 237 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 238 } 239 UNSAFE_END 240 241 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 242 UnsafeWrapper("Unsafe_GetObjectVolatile"); 243 GET_OOP_FIELD_VOLATILE(obj, offset, v) 244 return JNIHandles::make_local(env, v); 245 UNSAFE_END 246 247 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 248 UnsafeWrapper("Unsafe_SetObjectVolatile"); 249 oop x = JNIHandles::resolve(x_h); 250 oop p = JNIHandles::resolve(obj); 251 if (UseCompressedOops) { 252 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 253 } else { 254 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 255 } 256 OrderAccess::fence(); 257 UNSAFE_END 258 259 // Volatile long versions must use locks if !VM_Version::supports_cx8(). 260 // support_cx8 is a surrogate for 'supports atomic long memory ops'. 261 262 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 263 UnsafeWrapper("Unsafe_GetLongVolatile"); 264 { 265 if (VM_Version::supports_cx8()) { 266 GET_FIELD_VOLATILE(obj, offset, jlong, v); 267 return v; 268 } 269 else { 270 Handle p (THREAD, JNIHandles::resolve(obj)); 271 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 272 ObjectLocker ol(p, THREAD); 273 jlong value = *addr; 274 return value; 275 } 276 } 277 UNSAFE_END 278 279 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) 280 UnsafeWrapper("Unsafe_SetLongVolatile"); 281 { 282 if (VM_Version::supports_cx8()) { 283 SET_FIELD_VOLATILE(obj, offset, jlong, x); 284 } 285 else { 286 Handle p (THREAD, JNIHandles::resolve(obj)); 287 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 288 ObjectLocker ol(p, THREAD); 289 *addr = x; 290 } 291 } 292 UNSAFE_END 293 294 295 #define DEFINE_GETSETOOP(jboolean, Boolean) \ 296 \ 297 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \ 298 UnsafeWrapper("Unsafe_Get"#Boolean); \ 299 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \ 300 GET_FIELD(obj, offset, jboolean, v); \ 301 return v; \ 302 UNSAFE_END \ 303 \ 304 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \ 305 UnsafeWrapper("Unsafe_Set"#Boolean); \ 306 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \ 307 SET_FIELD(obj, offset, jboolean, x); \ 308 UNSAFE_END \ 309 \ 310 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \ 311 UnsafeWrapper("Unsafe_Get"#Boolean); \ 312 GET_FIELD(obj, offset, jboolean, v); \ 313 return v; \ 314 UNSAFE_END \ 315 \ 316 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \ 317 UnsafeWrapper("Unsafe_Set"#Boolean); \ 318 SET_FIELD(obj, offset, jboolean, x); \ 319 UNSAFE_END \ 320 \ 321 // END DEFINE_GETSETOOP. 322 323 324 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \ 325 \ 326 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \ 327 UnsafeWrapper("Unsafe_Get"#Boolean); \ 328 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \ 329 return v; \ 330 UNSAFE_END \ 331 \ 332 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \ 333 UnsafeWrapper("Unsafe_Set"#Boolean); \ 334 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \ 335 UNSAFE_END \ 336 \ 337 // END DEFINE_GETSETOOP_VOLATILE. 338 339 DEFINE_GETSETOOP(jboolean, Boolean) 340 DEFINE_GETSETOOP(jbyte, Byte) 341 DEFINE_GETSETOOP(jshort, Short); 342 DEFINE_GETSETOOP(jchar, Char); 343 DEFINE_GETSETOOP(jint, Int); 344 DEFINE_GETSETOOP(jlong, Long); 345 DEFINE_GETSETOOP(jfloat, Float); 346 DEFINE_GETSETOOP(jdouble, Double); 347 348 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) 349 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte) 350 DEFINE_GETSETOOP_VOLATILE(jshort, Short); 351 DEFINE_GETSETOOP_VOLATILE(jchar, Char); 352 DEFINE_GETSETOOP_VOLATILE(jint, Int); 353 // no long -- handled specially 354 DEFINE_GETSETOOP_VOLATILE(jfloat, Float); 355 DEFINE_GETSETOOP_VOLATILE(jdouble, Double); 356 357 #undef DEFINE_GETSETOOP 358 359 // The non-intrinsified versions of setOrdered just use setVolatile 360 361 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x)) \ 362 UnsafeWrapper("Unsafe_SetOrderedInt"); \ 363 SET_FIELD_VOLATILE(obj, offset, jint, x); \ 364 UNSAFE_END 365 366 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 367 UnsafeWrapper("Unsafe_SetOrderedObject"); 368 oop x = JNIHandles::resolve(x_h); 369 oop p = JNIHandles::resolve(obj); 370 if (UseCompressedOops) { 371 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 372 } else { 373 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 374 } 375 OrderAccess::fence(); 376 UNSAFE_END 377 378 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) 379 UnsafeWrapper("Unsafe_SetOrderedLong"); 380 { 381 if (VM_Version::supports_cx8()) { 382 SET_FIELD_VOLATILE(obj, offset, jlong, x); 383 } 384 else { 385 Handle p (THREAD, JNIHandles::resolve(obj)); 386 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 387 ObjectLocker ol(p, THREAD); 388 *addr = x; 389 } 390 } 391 UNSAFE_END 392 393 ////// Data in the C heap. 394 395 // Note: These do not throw NullPointerException for bad pointers. 396 // They just crash. Only a oop base pointer can generate a NullPointerException. 397 // 398 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \ 399 \ 400 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \ 401 UnsafeWrapper("Unsafe_GetNative"#Type); \ 402 void* p = addr_from_java(addr); \ 403 JavaThread* t = JavaThread::current(); \ 404 t->set_doing_unsafe_access(true); \ 405 java_type x = *(volatile native_type*)p; \ 406 t->set_doing_unsafe_access(false); \ 407 return x; \ 408 UNSAFE_END \ 409 \ 410 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \ 411 UnsafeWrapper("Unsafe_SetNative"#Type); \ 412 JavaThread* t = JavaThread::current(); \ 413 t->set_doing_unsafe_access(true); \ 414 void* p = addr_from_java(addr); \ 415 *(volatile native_type*)p = x; \ 416 t->set_doing_unsafe_access(false); \ 417 UNSAFE_END \ 418 \ 419 // END DEFINE_GETSETNATIVE. 420 421 DEFINE_GETSETNATIVE(jbyte, Byte, signed char) 422 DEFINE_GETSETNATIVE(jshort, Short, signed short); 423 DEFINE_GETSETNATIVE(jchar, Char, unsigned short); 424 DEFINE_GETSETNATIVE(jint, Int, jint); 425 // no long -- handled specially 426 DEFINE_GETSETNATIVE(jfloat, Float, float); 427 DEFINE_GETSETNATIVE(jdouble, Double, double); 428 429 #undef DEFINE_GETSETNATIVE 430 431 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr)) 432 UnsafeWrapper("Unsafe_GetNativeLong"); 433 JavaThread* t = JavaThread::current(); 434 // We do it this way to avoid problems with access to heap using 64 435 // bit loads, as jlong in heap could be not 64-bit aligned, and on 436 // some CPUs (SPARC) it leads to SIGBUS. 437 t->set_doing_unsafe_access(true); 438 void* p = addr_from_java(addr); 439 jlong x; 440 if (((intptr_t)p & 7) == 0) { 441 // jlong is aligned, do a volatile access 442 x = *(volatile jlong*)p; 443 } else { 444 jlong_accessor acc; 445 acc.words[0] = ((volatile jint*)p)[0]; 446 acc.words[1] = ((volatile jint*)p)[1]; 447 x = acc.long_value; 448 } 449 t->set_doing_unsafe_access(false); 450 return x; 451 UNSAFE_END 452 453 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 454 UnsafeWrapper("Unsafe_SetNativeLong"); 455 JavaThread* t = JavaThread::current(); 456 // see comment for Unsafe_GetNativeLong 457 t->set_doing_unsafe_access(true); 458 void* p = addr_from_java(addr); 459 if (((intptr_t)p & 7) == 0) { 460 // jlong is aligned, do a volatile access 461 *(volatile jlong*)p = x; 462 } else { 463 jlong_accessor acc; 464 acc.long_value = x; 465 ((volatile jint*)p)[0] = acc.words[0]; 466 ((volatile jint*)p)[1] = acc.words[1]; 467 } 468 t->set_doing_unsafe_access(false); 469 UNSAFE_END 470 471 472 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr)) 473 UnsafeWrapper("Unsafe_GetNativeAddress"); 474 void* p = addr_from_java(addr); 475 return addr_to_java(*(void**)p); 476 UNSAFE_END 477 478 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 479 UnsafeWrapper("Unsafe_SetNativeAddress"); 480 void* p = addr_from_java(addr); 481 *(void**)p = addr_from_java(x); 482 UNSAFE_END 483 484 485 ////// Allocation requests 486 487 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls)) 488 UnsafeWrapper("Unsafe_AllocateInstance"); 489 { 490 ThreadToNativeFromVM ttnfv(thread); 491 return env->AllocObject(cls); 492 } 493 UNSAFE_END 494 495 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size)) 496 UnsafeWrapper("Unsafe_AllocateMemory"); 497 size_t sz = (size_t)size; 498 if (sz != (julong)size || size < 0) { 499 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 500 } 501 if (sz == 0) { 502 return 0; 503 } 504 sz = round_to(sz, HeapWordSize); 505 void* x = os::malloc(sz); 506 if (x == NULL) { 507 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 508 } 509 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize); 510 return addr_to_java(x); 511 UNSAFE_END 512 513 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size)) 514 UnsafeWrapper("Unsafe_ReallocateMemory"); 515 void* p = addr_from_java(addr); 516 size_t sz = (size_t)size; 517 if (sz != (julong)size || size < 0) { 518 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 519 } 520 if (sz == 0) { 521 os::free(p); 522 return 0; 523 } 524 sz = round_to(sz, HeapWordSize); 525 void* x = (p == NULL) ? os::malloc(sz) : os::realloc(p, sz); 526 if (x == NULL) { 527 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 528 } 529 return addr_to_java(x); 530 UNSAFE_END 531 532 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr)) 533 UnsafeWrapper("Unsafe_FreeMemory"); 534 void* p = addr_from_java(addr); 535 if (p == NULL) { 536 return; 537 } 538 os::free(p); 539 UNSAFE_END 540 541 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value)) 542 UnsafeWrapper("Unsafe_SetMemory"); 543 size_t sz = (size_t)size; 544 if (sz != (julong)size || size < 0) { 545 THROW(vmSymbols::java_lang_IllegalArgumentException()); 546 } 547 char* p = (char*) addr_from_java(addr); 548 Copy::fill_to_memory_atomic(p, sz, value); 549 UNSAFE_END 550 551 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value)) 552 UnsafeWrapper("Unsafe_SetMemory"); 553 size_t sz = (size_t)size; 554 if (sz != (julong)size || size < 0) { 555 THROW(vmSymbols::java_lang_IllegalArgumentException()); 556 } 557 oop base = JNIHandles::resolve(obj); 558 void* p = index_oop_from_field_offset_long(base, offset); 559 Copy::fill_to_memory_atomic(p, sz, value); 560 UNSAFE_END 561 562 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size)) 563 UnsafeWrapper("Unsafe_CopyMemory"); 564 if (size == 0) { 565 return; 566 } 567 size_t sz = (size_t)size; 568 if (sz != (julong)size || size < 0) { 569 THROW(vmSymbols::java_lang_IllegalArgumentException()); 570 } 571 void* src = addr_from_java(srcAddr); 572 void* dst = addr_from_java(dstAddr); 573 Copy::conjoint_memory_atomic(src, dst, sz); 574 UNSAFE_END 575 576 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size)) 577 UnsafeWrapper("Unsafe_CopyMemory"); 578 if (size == 0) { 579 return; 580 } 581 size_t sz = (size_t)size; 582 if (sz != (julong)size || size < 0) { 583 THROW(vmSymbols::java_lang_IllegalArgumentException()); 584 } 585 oop srcp = JNIHandles::resolve(srcObj); 586 oop dstp = JNIHandles::resolve(dstObj); 587 if (dstp != NULL && !dstp->is_typeArray()) { 588 // NYI: This works only for non-oop arrays at present. 589 // Generalizing it would be reasonable, but requires card marking. 590 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad. 591 THROW(vmSymbols::java_lang_IllegalArgumentException()); 592 } 593 void* src = index_oop_from_field_offset_long(srcp, srcOffset); 594 void* dst = index_oop_from_field_offset_long(dstp, dstOffset); 595 Copy::conjoint_memory_atomic(src, dst, sz); 596 UNSAFE_END 597 598 599 ////// Random queries 600 601 // See comment at file start about UNSAFE_LEAF 602 //UNSAFE_LEAF(jint, Unsafe_AddressSize()) 603 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe)) 604 UnsafeWrapper("Unsafe_AddressSize"); 605 return sizeof(void*); 606 UNSAFE_END 607 608 // See comment at file start about UNSAFE_LEAF 609 //UNSAFE_LEAF(jint, Unsafe_PageSize()) 610 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe)) 611 UnsafeWrapper("Unsafe_PageSize"); 612 return os::vm_page_size(); 613 UNSAFE_END 614 615 jint find_field_offset(jobject field, int must_be_static, TRAPS) { 616 if (field == NULL) { 617 THROW_0(vmSymbols::java_lang_NullPointerException()); 618 } 619 620 oop reflected = JNIHandles::resolve_non_null(field); 621 oop mirror = java_lang_reflect_Field::clazz(reflected); 622 klassOop k = java_lang_Class::as_klassOop(mirror); 623 int slot = java_lang_reflect_Field::slot(reflected); 624 int modifiers = java_lang_reflect_Field::modifiers(reflected); 625 626 if (must_be_static >= 0) { 627 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0); 628 if (must_be_static != really_is_static) { 629 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 630 } 631 } 632 633 int offset = instanceKlass::cast(k)->offset_from_fields(slot); 634 return field_offset_from_byte_offset(offset); 635 } 636 637 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 638 UnsafeWrapper("Unsafe_ObjectFieldOffset"); 639 return find_field_offset(field, 0, THREAD); 640 UNSAFE_END 641 642 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 643 UnsafeWrapper("Unsafe_StaticFieldOffset"); 644 return find_field_offset(field, 1, THREAD); 645 UNSAFE_END 646 647 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field)) 648 UnsafeWrapper("Unsafe_StaticFieldBase"); 649 // Note: In this VM implementation, a field address is always a short 650 // offset from the base of a a klass metaobject. Thus, the full dynamic 651 // range of the return type is never used. However, some implementations 652 // might put the static field inside an array shared by many classes, 653 // or even at a fixed address, in which case the address could be quite 654 // large. In that last case, this function would return NULL, since 655 // the address would operate alone, without any base pointer. 656 657 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); 658 659 oop reflected = JNIHandles::resolve_non_null(field); 660 oop mirror = java_lang_reflect_Field::clazz(reflected); 661 int modifiers = java_lang_reflect_Field::modifiers(reflected); 662 663 if ((modifiers & JVM_ACC_STATIC) == 0) { 664 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 665 } 666 667 return JNIHandles::make_local(env, java_lang_Class::as_klassOop(mirror)); 668 UNSAFE_END 669 670 //@deprecated 671 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 672 UnsafeWrapper("Unsafe_FieldOffset"); 673 // tries (but fails) to be polymorphic between static and non-static: 674 jlong offset = find_field_offset(field, -1, THREAD); 675 guarantee(offset == (jint)offset, "offset fits in 32 bits"); 676 return (jint)offset; 677 UNSAFE_END 678 679 //@deprecated 680 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz)) 681 UnsafeWrapper("Unsafe_StaticFieldBase"); 682 if (clazz == NULL) { 683 THROW_0(vmSymbols::java_lang_NullPointerException()); 684 } 685 return JNIHandles::make_local(env, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz))); 686 UNSAFE_END 687 688 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) 689 UnsafeWrapper("Unsafe_EnsureClassInitialized"); 690 if (clazz == NULL) { 691 THROW(vmSymbols::java_lang_NullPointerException()); 692 } 693 oop mirror = JNIHandles::resolve_non_null(clazz); 694 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(mirror)); 695 if (k != NULL) { 696 k->initialize(CHECK); 697 } 698 UNSAFE_END 699 700 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) { 701 if (acls == NULL) { 702 THROW(vmSymbols::java_lang_NullPointerException()); 703 } 704 oop mirror = JNIHandles::resolve_non_null(acls); 705 klassOop k = java_lang_Class::as_klassOop(mirror); 706 if (k == NULL || !k->klass_part()->oop_is_array()) { 707 THROW(vmSymbols::java_lang_InvalidClassException()); 708 } else if (k->klass_part()->oop_is_objArray()) { 709 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT); 710 scale = heapOopSize; 711 } else if (k->klass_part()->oop_is_typeArray()) { 712 typeArrayKlass* tak = typeArrayKlass::cast(k); 713 base = tak->array_header_in_bytes(); 714 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok"); 715 scale = (1 << tak->log2_element_size()); 716 } else { 717 ShouldNotReachHere(); 718 } 719 } 720 721 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls)) 722 UnsafeWrapper("Unsafe_ArrayBaseOffset"); 723 int base, scale; 724 getBaseAndScale(base, scale, acls, CHECK_0); 725 return field_offset_from_byte_offset(base); 726 UNSAFE_END 727 728 729 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls)) 730 UnsafeWrapper("Unsafe_ArrayIndexScale"); 731 int base, scale; 732 getBaseAndScale(base, scale, acls, CHECK_0); 733 // This VM packs both fields and array elements down to the byte. 734 // But watch out: If this changes, so that array references for 735 // a given primitive type (say, T_BOOLEAN) use different memory units 736 // than fields, this method MUST return zero for such arrays. 737 // For example, the VM used to store sub-word sized fields in full 738 // words in the object layout, so that accessors like getByte(Object,int) 739 // did not really do what one might expect for arrays. Therefore, 740 // this function used to report a zero scale factor, so that the user 741 // would know not to attempt to access sub-word array elements. 742 // // Code for unpacked fields: 743 // if (scale < wordSize) return 0; 744 745 // The following allows for a pretty general fieldOffset cookie scheme, 746 // but requires it to be linear in byte offset. 747 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0); 748 UNSAFE_END 749 750 751 static inline void throw_new(JNIEnv *env, const char *ename) { 752 char buf[100]; 753 strcpy(buf, "java/lang/"); 754 strcat(buf, ename); 755 jclass cls = env->FindClass(buf); 756 char* msg = NULL; 757 env->ThrowNew(cls, msg); 758 } 759 760 static jclass Unsafe_DefineClass(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) { 761 { 762 // Code lifted from JDK 1.3 ClassLoader.c 763 764 jbyte *body; 765 char *utfName; 766 jclass result = 0; 767 char buf[128]; 768 769 if (UsePerfData) { 770 ClassLoader::unsafe_defineClassCallCounter()->inc(); 771 } 772 773 if (data == NULL) { 774 throw_new(env, "NullPointerException"); 775 return 0; 776 } 777 778 /* Work around 4153825. malloc crashes on Solaris when passed a 779 * negative size. 780 */ 781 if (length < 0) { 782 throw_new(env, "ArrayIndexOutOfBoundsException"); 783 return 0; 784 } 785 786 body = NEW_C_HEAP_ARRAY(jbyte, length); 787 788 if (body == 0) { 789 throw_new(env, "OutOfMemoryError"); 790 return 0; 791 } 792 793 env->GetByteArrayRegion(data, offset, length, body); 794 795 if (env->ExceptionOccurred()) 796 goto free_body; 797 798 if (name != NULL) { 799 uint len = env->GetStringUTFLength(name); 800 int unicode_len = env->GetStringLength(name); 801 if (len >= sizeof(buf)) { 802 utfName = NEW_C_HEAP_ARRAY(char, len + 1); 803 if (utfName == NULL) { 804 throw_new(env, "OutOfMemoryError"); 805 goto free_body; 806 } 807 } else { 808 utfName = buf; 809 } 810 env->GetStringUTFRegion(name, 0, unicode_len, utfName); 811 //VerifyFixClassname(utfName); 812 for (uint i = 0; i < len; i++) { 813 if (utfName[i] == '.') utfName[i] = '/'; 814 } 815 } else { 816 utfName = NULL; 817 } 818 819 result = JVM_DefineClass(env, utfName, loader, body, length, pd); 820 821 if (utfName && utfName != buf) 822 FREE_C_HEAP_ARRAY(char, utfName); 823 824 free_body: 825 FREE_C_HEAP_ARRAY(jbyte, body); 826 return result; 827 } 828 } 829 830 831 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length)) 832 UnsafeWrapper("Unsafe_DefineClass"); 833 { 834 ThreadToNativeFromVM ttnfv(thread); 835 836 int depthFromDefineClass0 = 1; 837 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0); 838 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller); 839 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller); 840 841 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd); 842 } 843 UNSAFE_END 844 845 846 UNSAFE_ENTRY(jclass, Unsafe_DefineClass1(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd)) 847 UnsafeWrapper("Unsafe_DefineClass"); 848 { 849 ThreadToNativeFromVM ttnfv(thread); 850 851 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd); 852 } 853 UNSAFE_END 854 855 #define DAC_Args CLS"[B["OBJ 856 // define a class but do not make it known to the class loader or system dictionary 857 // - host_class: supplies context for linkage, access control, protection domain, and class loader 858 // - data: bytes of a class file, a raw memory address (length gives the number of bytes) 859 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data 860 861 // When you load an anonymous class U, it works as if you changed its name just before loading, 862 // to a name that you will never use again. Since the name is lost, no other class can directly 863 // link to any member of U. Just after U is loaded, the only way to use it is reflectively, 864 // through java.lang.Class methods like Class.newInstance. 865 866 // Access checks for linkage sites within U continue to follow the same rules as for named classes. 867 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded. 868 // An anonymous class also has special privileges to access any member of its host class. 869 // This is the main reason why this loading operation is unsafe. The purpose of this is to 870 // allow language implementations to simulate "open classes"; a host class in effect gets 871 // new code when an anonymous class is loaded alongside it. A less convenient but more 872 // standard way to do this is with reflection, which can also be set to ignore access 873 // restrictions. 874 875 // Access into an anonymous class is possible only through reflection. Therefore, there 876 // are no special access rules for calling into an anonymous class. The relaxed access 877 // rule for the host class is applied in the opposite direction: A host class reflectively 878 // access one of its anonymous classes. 879 880 // If you load the same bytecodes twice, you get two different classes. You can reload 881 // the same bytecodes with or without varying CP patches. 882 883 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1. 884 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is). 885 // The CONSTANT_Class entry for that name can be patched to refer directly to U1. 886 887 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as 888 // an outer class (so that U2 is an anonymous inner class of anonymous U1). 889 // It is not possible for a named class, or an older anonymous class, to refer by 890 // name (via its CP) to a newer anonymous class. 891 892 // CP patching may also be used to modify (i.e., hack) the names of methods, classes, 893 // or type descriptors used in the loaded anonymous class. 894 895 // Finally, CP patching may be used to introduce "live" objects into the constant pool, 896 // instead of "dead" strings. A compiled statement like println((Object)"hello") can 897 // be changed to println(greeting), where greeting is an arbitrary object created before 898 // the anonymous class is loaded. This is useful in dynamic languages, in which 899 // various kinds of metaobjects must be introduced as constants into bytecode. 900 // Note the cast (Object), which tells the verifier to expect an arbitrary object, 901 // not just a literal string. For such ldc instructions, the verifier uses the 902 // type Object instead of String, if the loaded constant is not in fact a String. 903 904 static oop 905 Unsafe_DefineAnonymousClass_impl(JNIEnv *env, 906 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh, 907 HeapWord* *temp_alloc, 908 TRAPS) { 909 910 if (UsePerfData) { 911 ClassLoader::unsafe_defineClassCallCounter()->inc(); 912 } 913 914 if (data == NULL) { 915 THROW_0(vmSymbols::java_lang_NullPointerException()); 916 } 917 918 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length(); 919 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord); 920 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length); 921 if (body == NULL) { 922 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 923 } 924 925 // caller responsible to free it: 926 (*temp_alloc) = body; 927 928 { 929 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0); 930 Copy::conjoint_words((HeapWord*) array_base, body, word_length); 931 } 932 933 u1* class_bytes = (u1*) body; 934 int class_bytes_length = (int) length; 935 if (class_bytes_length < 0) class_bytes_length = 0; 936 if (class_bytes == NULL 937 || host_class == NULL 938 || length != class_bytes_length) 939 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 940 941 objArrayHandle cp_patches_h; 942 if (cp_patches_jh != NULL) { 943 oop p = JNIHandles::resolve_non_null(cp_patches_jh); 944 if (!p->is_objArray()) 945 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 946 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p); 947 } 948 949 KlassHandle host_klass(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(host_class))); 950 const char* host_source = host_klass->external_name(); 951 Handle host_loader(THREAD, host_klass->class_loader()); 952 Handle host_domain(THREAD, host_klass->protection_domain()); 953 954 GrowableArray<Handle>* cp_patches = NULL; 955 if (cp_patches_h.not_null()) { 956 int alen = cp_patches_h->length(); 957 for (int i = alen-1; i >= 0; i--) { 958 oop p = cp_patches_h->obj_at(i); 959 if (p != NULL) { 960 Handle patch(THREAD, p); 961 if (cp_patches == NULL) 962 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle()); 963 cp_patches->at_put(i, patch); 964 } 965 } 966 } 967 968 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source); 969 970 instanceKlassHandle anon_klass; 971 { 972 symbolHandle no_class_name; 973 klassOop anonk = SystemDictionary::parse_stream(no_class_name, 974 host_loader, host_domain, 975 &st, host_klass, cp_patches, 976 CHECK_NULL); 977 if (anonk == NULL) return NULL; 978 anon_klass = instanceKlassHandle(THREAD, anonk); 979 } 980 981 // let caller initialize it as needed... 982 983 return anon_klass->java_mirror(); 984 } 985 986 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh)) 987 { 988 UnsafeWrapper("Unsafe_DefineAnonymousClass"); 989 ResourceMark rm(THREAD); 990 991 HeapWord* temp_alloc = NULL; 992 993 jobject res_jh = NULL; 994 995 { oop res_oop = Unsafe_DefineAnonymousClass_impl(env, 996 host_class, data, cp_patches_jh, 997 &temp_alloc, THREAD); 998 if (res_oop != NULL) 999 res_jh = JNIHandles::make_local(env, res_oop); 1000 } 1001 1002 // try/finally clause: 1003 if (temp_alloc != NULL) { 1004 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc); 1005 } 1006 1007 return (jclass) res_jh; 1008 } 1009 UNSAFE_END 1010 1011 1012 1013 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 1014 UnsafeWrapper("Unsafe_MonitorEnter"); 1015 { 1016 if (jobj == NULL) { 1017 THROW(vmSymbols::java_lang_NullPointerException()); 1018 } 1019 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 1020 ObjectSynchronizer::jni_enter(obj, CHECK); 1021 } 1022 UNSAFE_END 1023 1024 1025 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 1026 UnsafeWrapper("Unsafe_TryMonitorEnter"); 1027 { 1028 if (jobj == NULL) { 1029 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 1030 } 1031 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 1032 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0); 1033 return (res ? JNI_TRUE : JNI_FALSE); 1034 } 1035 UNSAFE_END 1036 1037 1038 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj)) 1039 UnsafeWrapper("Unsafe_MonitorExit"); 1040 { 1041 if (jobj == NULL) { 1042 THROW(vmSymbols::java_lang_NullPointerException()); 1043 } 1044 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj)); 1045 ObjectSynchronizer::jni_exit(obj(), CHECK); 1046 } 1047 UNSAFE_END 1048 1049 1050 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr)) 1051 UnsafeWrapper("Unsafe_ThrowException"); 1052 { 1053 ThreadToNativeFromVM ttnfv(thread); 1054 env->Throw(thr); 1055 } 1056 UNSAFE_END 1057 1058 // JSR166 ------------------------------------------------------------------ 1059 1060 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h)) 1061 UnsafeWrapper("Unsafe_CompareAndSwapObject"); 1062 oop x = JNIHandles::resolve(x_h); 1063 oop e = JNIHandles::resolve(e_h); 1064 oop p = JNIHandles::resolve(obj); 1065 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset); 1066 if (UseCompressedOops) { 1067 update_barrier_set_pre((narrowOop*)addr, e); 1068 } else { 1069 update_barrier_set_pre((oop*)addr, e); 1070 } 1071 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e); 1072 jboolean success = (res == e); 1073 if (success) 1074 update_barrier_set((void*)addr, x); 1075 return success; 1076 UNSAFE_END 1077 1078 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x)) 1079 UnsafeWrapper("Unsafe_CompareAndSwapInt"); 1080 oop p = JNIHandles::resolve(obj); 1081 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset); 1082 return (jint)(Atomic::cmpxchg(x, addr, e)) == e; 1083 UNSAFE_END 1084 1085 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x)) 1086 UnsafeWrapper("Unsafe_CompareAndSwapLong"); 1087 Handle p (THREAD, JNIHandles::resolve(obj)); 1088 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 1089 if (VM_Version::supports_cx8()) 1090 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e; 1091 else { 1092 jboolean success = false; 1093 ObjectLocker ol(p, THREAD); 1094 if (*addr == e) { *addr = x; success = true; } 1095 return success; 1096 } 1097 UNSAFE_END 1098 1099 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time)) 1100 UnsafeWrapper("Unsafe_Park"); 1101 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time); 1102 JavaThreadParkedState jtps(thread, time != 0); 1103 thread->parker()->park(isAbsolute != 0, time); 1104 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker()); 1105 UNSAFE_END 1106 1107 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread)) 1108 UnsafeWrapper("Unsafe_Unpark"); 1109 Parker* p = NULL; 1110 if (jthread != NULL) { 1111 oop java_thread = JNIHandles::resolve_non_null(jthread); 1112 if (java_thread != NULL) { 1113 jlong lp = java_lang_Thread::park_event(java_thread); 1114 if (lp != 0) { 1115 // This cast is OK even though the jlong might have been read 1116 // non-atomically on 32bit systems, since there, one word will 1117 // always be zero anyway and the value set is always the same 1118 p = (Parker*)addr_from_java(lp); 1119 } else { 1120 // Grab lock if apparently null or using older version of library 1121 MutexLocker mu(Threads_lock); 1122 java_thread = JNIHandles::resolve_non_null(jthread); 1123 if (java_thread != NULL) { 1124 JavaThread* thr = java_lang_Thread::thread(java_thread); 1125 if (thr != NULL) { 1126 p = thr->parker(); 1127 if (p != NULL) { // Bind to Java thread for next time. 1128 java_lang_Thread::set_park_event(java_thread, addr_to_java(p)); 1129 } 1130 } 1131 } 1132 } 1133 } 1134 } 1135 if (p != NULL) { 1136 HS_DTRACE_PROBE1(hotspot, thread__unpark, p); 1137 p->unpark(); 1138 } 1139 UNSAFE_END 1140 1141 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem)) 1142 UnsafeWrapper("Unsafe_Loadavg"); 1143 const int max_nelem = 3; 1144 double la[max_nelem]; 1145 jint ret; 1146 1147 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg)); 1148 assert(a->is_typeArray(), "must be type array"); 1149 1150 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) { 1151 ThreadToNativeFromVM ttnfv(thread); 1152 throw_new(env, "ArrayIndexOutOfBoundsException"); 1153 return -1; 1154 } 1155 1156 ret = os::loadavg(la, nelem); 1157 if (ret == -1) return -1; 1158 1159 // if successful, ret is the number of samples actually retrieved. 1160 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value"); 1161 switch(ret) { 1162 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through 1163 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through 1164 case 1: a->double_at_put(0, (jdouble)la[0]); break; 1165 } 1166 return ret; 1167 UNSAFE_END 1168 1169 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 1170 UnsafeWrapper("Unsafe_PrefetchRead"); 1171 oop p = JNIHandles::resolve(obj); 1172 void* addr = index_oop_from_field_offset_long(p, 0); 1173 Prefetch::read(addr, (intx)offset); 1174 UNSAFE_END 1175 1176 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 1177 UnsafeWrapper("Unsafe_PrefetchWrite"); 1178 oop p = JNIHandles::resolve(obj); 1179 void* addr = index_oop_from_field_offset_long(p, 0); 1180 Prefetch::write(addr, (intx)offset); 1181 UNSAFE_END 1182 1183 1184 /// JVM_RegisterUnsafeMethods 1185 1186 #define ADR "J" 1187 1188 #define LANG "Ljava/lang/" 1189 1190 #define OBJ LANG"Object;" 1191 #define CLS LANG"Class;" 1192 #define CTR LANG"reflect/Constructor;" 1193 #define FLD LANG"reflect/Field;" 1194 #define MTH LANG"reflect/Method;" 1195 #define THR LANG"Throwable;" 1196 1197 #define DC0_Args LANG"String;[BII" 1198 #define DC1_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;" 1199 1200 #define CC (char*) /*cast a literal from (const char*)*/ 1201 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1202 1203 // define deprecated accessors for compabitility with 1.4.0 1204 #define DECLARE_GETSETOOP_140(Boolean, Z) \ 1205 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \ 1206 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)} 1207 1208 // Note: In 1.4.1, getObject and kin take both int and long offsets. 1209 #define DECLARE_GETSETOOP_141(Boolean, Z) \ 1210 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1211 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)} 1212 1213 // Note: In 1.5.0, there are volatile versions too 1214 #define DECLARE_GETSETOOP(Boolean, Z) \ 1215 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1216 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \ 1217 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \ 1218 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)} 1219 1220 1221 #define DECLARE_GETSETNATIVE(Byte, B) \ 1222 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \ 1223 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)} 1224 1225 1226 1227 // %%% These are temporarily supported until the SDK sources 1228 // contain the necessarily updated Unsafe.java. 1229 static JNINativeMethod methods_140[] = { 1230 1231 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)}, 1232 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)}, 1233 1234 DECLARE_GETSETOOP_140(Boolean, Z), 1235 DECLARE_GETSETOOP_140(Byte, B), 1236 DECLARE_GETSETOOP_140(Short, S), 1237 DECLARE_GETSETOOP_140(Char, C), 1238 DECLARE_GETSETOOP_140(Int, I), 1239 DECLARE_GETSETOOP_140(Long, J), 1240 DECLARE_GETSETOOP_140(Float, F), 1241 DECLARE_GETSETOOP_140(Double, D), 1242 1243 DECLARE_GETSETNATIVE(Byte, B), 1244 DECLARE_GETSETNATIVE(Short, S), 1245 DECLARE_GETSETNATIVE(Char, C), 1246 DECLARE_GETSETNATIVE(Int, I), 1247 DECLARE_GETSETNATIVE(Long, J), 1248 DECLARE_GETSETNATIVE(Float, F), 1249 DECLARE_GETSETNATIVE(Double, D), 1250 1251 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1252 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1253 1254 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1255 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1256 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1257 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}, 1258 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1259 1260 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, //deprecated 1261 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, //deprecated 1262 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1263 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1264 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1265 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1266 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1267 1268 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1269 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)}, 1270 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1271 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1272 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1273 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)} 1274 }; 1275 1276 // These are the old methods prior to the JSR 166 changes in 1.5.0 1277 static JNINativeMethod methods_141[] = { 1278 1279 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1280 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1281 1282 DECLARE_GETSETOOP_141(Boolean, Z), 1283 DECLARE_GETSETOOP_141(Byte, B), 1284 DECLARE_GETSETOOP_141(Short, S), 1285 DECLARE_GETSETOOP_141(Char, C), 1286 DECLARE_GETSETOOP_141(Int, I), 1287 DECLARE_GETSETOOP_141(Long, J), 1288 DECLARE_GETSETOOP_141(Float, F), 1289 DECLARE_GETSETOOP_141(Double, D), 1290 1291 DECLARE_GETSETNATIVE(Byte, B), 1292 DECLARE_GETSETNATIVE(Short, S), 1293 DECLARE_GETSETNATIVE(Char, C), 1294 DECLARE_GETSETNATIVE(Int, I), 1295 DECLARE_GETSETNATIVE(Long, J), 1296 DECLARE_GETSETNATIVE(Float, F), 1297 DECLARE_GETSETNATIVE(Double, D), 1298 1299 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1300 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1301 1302 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1303 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1304 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1305 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}, 1306 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1307 1308 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1309 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1310 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1311 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1312 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1313 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1314 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1315 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1316 1317 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1318 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)}, 1319 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1320 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1321 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1322 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)} 1323 1324 }; 1325 1326 // These are the old methods prior to the JSR 166 changes in 1.6.0 1327 static JNINativeMethod methods_15[] = { 1328 1329 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1330 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1331 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1332 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1333 1334 1335 DECLARE_GETSETOOP(Boolean, Z), 1336 DECLARE_GETSETOOP(Byte, B), 1337 DECLARE_GETSETOOP(Short, S), 1338 DECLARE_GETSETOOP(Char, C), 1339 DECLARE_GETSETOOP(Int, I), 1340 DECLARE_GETSETOOP(Long, J), 1341 DECLARE_GETSETOOP(Float, F), 1342 DECLARE_GETSETOOP(Double, D), 1343 1344 DECLARE_GETSETNATIVE(Byte, B), 1345 DECLARE_GETSETNATIVE(Short, S), 1346 DECLARE_GETSETNATIVE(Char, C), 1347 DECLARE_GETSETNATIVE(Int, I), 1348 DECLARE_GETSETNATIVE(Long, J), 1349 DECLARE_GETSETNATIVE(Float, F), 1350 DECLARE_GETSETNATIVE(Double, D), 1351 1352 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1353 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1354 1355 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1356 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1357 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1358 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}, 1359 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1360 1361 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1362 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1363 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1364 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1365 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1366 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1367 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1368 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1369 1370 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1371 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)}, 1372 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1373 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1374 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1375 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1376 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1377 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1378 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1379 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1380 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1381 1382 }; 1383 1384 // These are the correct methods, moving forward: 1385 static JNINativeMethod methods[] = { 1386 1387 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1388 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1389 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1390 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1391 1392 1393 DECLARE_GETSETOOP(Boolean, Z), 1394 DECLARE_GETSETOOP(Byte, B), 1395 DECLARE_GETSETOOP(Short, S), 1396 DECLARE_GETSETOOP(Char, C), 1397 DECLARE_GETSETOOP(Int, I), 1398 DECLARE_GETSETOOP(Long, J), 1399 DECLARE_GETSETOOP(Float, F), 1400 DECLARE_GETSETOOP(Double, D), 1401 1402 DECLARE_GETSETNATIVE(Byte, B), 1403 DECLARE_GETSETNATIVE(Short, S), 1404 DECLARE_GETSETNATIVE(Char, C), 1405 DECLARE_GETSETNATIVE(Int, I), 1406 DECLARE_GETSETNATIVE(Long, J), 1407 DECLARE_GETSETNATIVE(Float, F), 1408 DECLARE_GETSETNATIVE(Double, D), 1409 1410 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1411 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1412 1413 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1414 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1415 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1416 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}, 1417 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1418 1419 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1420 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1421 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1422 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1423 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1424 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1425 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1426 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1427 1428 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1429 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)}, 1430 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1431 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1432 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1433 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)}, 1434 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1435 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1436 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1437 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1438 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)}, 1439 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)}, 1440 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)}, 1441 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1442 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1443 1444 // {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}, 1445 1446 // {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1447 // {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)} 1448 // {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1449 // {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)} 1450 1451 }; 1452 1453 JNINativeMethod loadavg_method[] = { 1454 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)} 1455 }; 1456 1457 JNINativeMethod prefetch_methods[] = { 1458 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1459 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}, 1460 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1461 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)} 1462 }; 1463 1464 JNINativeMethod memcopy_methods[] = { 1465 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)}, 1466 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)} 1467 }; 1468 1469 JNINativeMethod memcopy_methods_15[] = { 1470 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1471 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)} 1472 }; 1473 1474 JNINativeMethod anonk_methods[] = { 1475 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)}, 1476 }; 1477 1478 #undef CC 1479 #undef FN_PTR 1480 1481 #undef ADR 1482 #undef LANG 1483 #undef OBJ 1484 #undef CLS 1485 #undef CTR 1486 #undef FLD 1487 #undef MTH 1488 #undef THR 1489 #undef DC0_Args 1490 #undef DC1_Args 1491 1492 #undef DECLARE_GETSETOOP 1493 #undef DECLARE_GETSETNATIVE 1494 1495 1496 // This one function is exported, used by NativeLookup. 1497 // The Unsafe_xxx functions above are called only from the interpreter. 1498 // The optimizer looks at names and signatures to recognize 1499 // individual functions. 1500 1501 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls)) 1502 UnsafeWrapper("JVM_RegisterUnsafeMethods"); 1503 { 1504 ThreadToNativeFromVM ttnfv(thread); 1505 { 1506 env->RegisterNatives(unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod)); 1507 if (env->ExceptionOccurred()) { 1508 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1509 tty->print_cr("Warning: SDK 1.6 Unsafe.loadavg not found."); 1510 } 1511 env->ExceptionClear(); 1512 } 1513 } 1514 { 1515 env->RegisterNatives(unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod)); 1516 if (env->ExceptionOccurred()) { 1517 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1518 tty->print_cr("Warning: SDK 1.6 Unsafe.prefetchRead/Write not found."); 1519 } 1520 env->ExceptionClear(); 1521 } 1522 } 1523 { 1524 env->RegisterNatives(unsafecls, memcopy_methods, sizeof(memcopy_methods)/sizeof(JNINativeMethod)); 1525 if (env->ExceptionOccurred()) { 1526 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1527 tty->print_cr("Warning: SDK 1.7 Unsafe.copyMemory not found."); 1528 } 1529 env->ExceptionClear(); 1530 env->RegisterNatives(unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod)); 1531 if (env->ExceptionOccurred()) { 1532 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1533 tty->print_cr("Warning: SDK 1.5 Unsafe.copyMemory not found."); 1534 } 1535 env->ExceptionClear(); 1536 } 1537 } 1538 } 1539 if (AnonymousClasses) { 1540 env->RegisterNatives(unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod)); 1541 if (env->ExceptionOccurred()) { 1542 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1543 tty->print_cr("Warning: SDK 1.7 Unsafe.defineClass (anonymous version) not found."); 1544 } 1545 env->ExceptionClear(); 1546 } 1547 } 1548 int status = env->RegisterNatives(unsafecls, methods, sizeof(methods)/sizeof(JNINativeMethod)); 1549 if (env->ExceptionOccurred()) { 1550 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1551 tty->print_cr("Warning: SDK 1.6 version of Unsafe not found."); 1552 } 1553 env->ExceptionClear(); 1554 // %%% For now, be backward compatible with an older class: 1555 status = env->RegisterNatives(unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod)); 1556 } 1557 if (env->ExceptionOccurred()) { 1558 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1559 tty->print_cr("Warning: SDK 1.5 version of Unsafe not found."); 1560 } 1561 env->ExceptionClear(); 1562 // %%% For now, be backward compatible with an older class: 1563 status = env->RegisterNatives(unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod)); 1564 } 1565 if (env->ExceptionOccurred()) { 1566 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1567 tty->print_cr("Warning: SDK 1.4.1 version of Unsafe not found."); 1568 } 1569 env->ExceptionClear(); 1570 // %%% For now, be backward compatible with an older class: 1571 status = env->RegisterNatives(unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod)); 1572 } 1573 guarantee(status == 0, "register unsafe natives"); 1574 } 1575 JVM_END