1 /* 2 * Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/vmSymbols.hpp" 27 #include "utilities/macros.hpp" 28 #if INCLUDE_ALL_GCS 29 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" 30 #endif // INCLUDE_ALL_GCS 31 #include "memory/allocation.inline.hpp" 32 #include "prims/jni.h" 33 #include "prims/jvm.h" 34 #include "runtime/globals.hpp" 35 #include "runtime/interfaceSupport.hpp" 36 #include "runtime/prefetch.inline.hpp" 37 #include "runtime/orderAccess.inline.hpp" 38 #include "runtime/reflection.hpp" 39 #include "runtime/synchronizer.hpp" 40 #include "services/threadService.hpp" 41 #include "trace/tracing.hpp" 42 #include "utilities/copy.hpp" 43 #include "utilities/dtrace.hpp" 44 45 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 46 47 /* 48 * Implementation of class sun.misc.Unsafe 49 */ 50 51 #ifndef USDT2 52 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long); 53 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t); 54 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t); 55 #endif /* !USDT2 */ 56 57 #define MAX_OBJECT_SIZE \ 58 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \ 59 + ((julong)max_jint * sizeof(double)) ) 60 61 62 #define UNSAFE_ENTRY(result_type, header) \ 63 JVM_ENTRY(result_type, header) 64 65 // Can't use UNSAFE_LEAF because it has the signature of a straight 66 // call into the runtime (just like JVM_LEAF, funny that) but it's 67 // called like a Java Native and thus the wrapper built for it passes 68 // arguments like a JNI call. It expects those arguments to be popped 69 // from the stack on Intel like all good JNI args are, and adjusts the 70 // stack according. Since the JVM_LEAF call expects no extra 71 // arguments the stack isn't popped in the C code, is pushed by the 72 // wrapper and we get sick. 73 //#define UNSAFE_LEAF(result_type, header) \ 74 // JVM_LEAF(result_type, header) 75 76 #define UNSAFE_END JVM_END 77 78 #define UnsafeWrapper(arg) /*nothing, for the present*/ 79 80 81 inline void* addr_from_java(jlong addr) { 82 // This assert fails in a variety of ways on 32-bit systems. 83 // It is impossible to predict whether native code that converts 84 // pointers to longs will sign-extend or zero-extend the addresses. 85 //assert(addr == (uintptr_t)addr, "must not be odd high bits"); 86 return (void*)(uintptr_t)addr; 87 } 88 89 inline jlong addr_to_java(void* p) { 90 assert(p == (void*)(uintptr_t)p, "must not be odd high bits"); 91 return (uintptr_t)p; 92 } 93 94 95 // Note: The VM's obj_field and related accessors use byte-scaled 96 // ("unscaled") offsets, just as the unsafe methods do. 97 98 // However, the method Unsafe.fieldOffset explicitly declines to 99 // guarantee this. The field offset values manipulated by the Java user 100 // through the Unsafe API are opaque cookies that just happen to be byte 101 // offsets. We represent this state of affairs by passing the cookies 102 // through conversion functions when going between the VM and the Unsafe API. 103 // The conversion functions just happen to be no-ops at present. 104 105 inline jlong field_offset_to_byte_offset(jlong field_offset) { 106 return field_offset; 107 } 108 109 inline jlong field_offset_from_byte_offset(jlong byte_offset) { 110 return byte_offset; 111 } 112 113 inline jint invocation_key_from_method_slot(jint slot) { 114 return slot; 115 } 116 117 inline jint invocation_key_to_method_slot(jint key) { 118 return key; 119 } 120 121 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) { 122 jlong byte_offset = field_offset_to_byte_offset(field_offset); 123 #ifdef ASSERT 124 if (p != NULL) { 125 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset"); 126 if (byte_offset == (jint)byte_offset) { 127 void* ptr_plus_disp = (address)p + byte_offset; 128 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp, 129 "raw [ptr+disp] must be consistent with oop::field_base"); 130 } 131 jlong p_size = HeapWordSize * (jlong)(p->size()); 132 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size)); 133 } 134 #endif 135 if (sizeof(char*) == sizeof(jint)) // (this constant folds!) 136 return (address)p + (jint) byte_offset; 137 else 138 return (address)p + byte_offset; 139 } 140 141 // Externally callable versions: 142 // (Use these in compiler intrinsics which emulate unsafe primitives.) 143 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) { 144 return field_offset; 145 } 146 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) { 147 return byte_offset; 148 } 149 jint Unsafe_invocation_key_from_method_slot(jint slot) { 150 return invocation_key_from_method_slot(slot); 151 } 152 jint Unsafe_invocation_key_to_method_slot(jint key) { 153 return invocation_key_to_method_slot(key); 154 } 155 156 157 ///// Data in the Java heap. 158 159 #define GET_FIELD(obj, offset, type_name, v) \ 160 oop p = JNIHandles::resolve(obj); \ 161 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset) 162 163 #define SET_FIELD(obj, offset, type_name, x) \ 164 oop p = JNIHandles::resolve(obj); \ 165 *(type_name*)index_oop_from_field_offset_long(p, offset) = x 166 167 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \ 168 oop p = JNIHandles::resolve(obj); \ 169 if (support_IRIW_for_not_multiple_copy_atomic_cpu) { \ 170 OrderAccess::fence(); \ 171 } \ 172 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset)); 173 174 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \ 175 oop p = JNIHandles::resolve(obj); \ 176 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x); 177 178 // Macros for oops that check UseCompressedOops 179 180 #define GET_OOP_FIELD(obj, offset, v) \ 181 oop p = JNIHandles::resolve(obj); \ 182 oop v; \ 183 if (UseCompressedOops) { \ 184 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \ 185 v = oopDesc::decode_heap_oop(n); \ 186 } else { \ 187 v = *(oop*)index_oop_from_field_offset_long(p, offset); \ 188 } 189 190 191 // Get/SetObject must be special-cased, since it works with handles. 192 193 // The xxx140 variants for backward compatibility do not allow a full-width offset. 194 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) 195 UnsafeWrapper("Unsafe_GetObject"); 196 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); 197 GET_OOP_FIELD(obj, offset, v) 198 jobject ret = JNIHandles::make_local(env, v); 199 #if INCLUDE_ALL_GCS 200 // We could be accessing the referent field in a reference 201 // object. If G1 is enabled then we need to register a non-null 202 // referent with the SATB barrier. 203 if (UseG1GC) { 204 bool needs_barrier = false; 205 206 if (ret != NULL) { 207 if (offset == java_lang_ref_Reference::referent_offset) { 208 oop o = JNIHandles::resolve_non_null(obj); 209 Klass* k = o->klass(); 210 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) { 211 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity"); 212 needs_barrier = true; 213 } 214 } 215 } 216 217 if (needs_barrier) { 218 oop referent = JNIHandles::resolve(ret); 219 G1SATBCardTableModRefBS::enqueue(referent); 220 } 221 } 222 #endif // INCLUDE_ALL_GCS 223 return ret; 224 UNSAFE_END 225 226 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h)) 227 UnsafeWrapper("Unsafe_SetObject"); 228 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); 229 oop x = JNIHandles::resolve(x_h); 230 //SET_FIELD(obj, offset, oop, x); 231 oop p = JNIHandles::resolve(obj); 232 if (UseCompressedOops) { 233 if (x != NULL) { 234 // If there is a heap base pointer, we are obliged to emit a store barrier. 235 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 236 } else { 237 narrowOop n = oopDesc::encode_heap_oop_not_null(x); 238 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n; 239 } 240 } else { 241 if (x != NULL) { 242 // If there is a heap base pointer, we are obliged to emit a store barrier. 243 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 244 } else { 245 *(oop*)index_oop_from_field_offset_long(p, offset) = x; 246 } 247 } 248 UNSAFE_END 249 250 // The normal variants allow a null base pointer with an arbitrary address. 251 // But if the base pointer is non-null, the offset should make some sense. 252 // That is, it should be in the range [0, MAX_OBJECT_SIZE]. 253 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 254 UnsafeWrapper("Unsafe_GetObject"); 255 GET_OOP_FIELD(obj, offset, v) 256 jobject ret = JNIHandles::make_local(env, v); 257 #if INCLUDE_ALL_GCS 258 // We could be accessing the referent field in a reference 259 // object. If G1 is enabled then we need to register non-null 260 // referent with the SATB barrier. 261 if (UseG1GC) { 262 bool needs_barrier = false; 263 264 if (ret != NULL) { 265 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) { 266 oop o = JNIHandles::resolve(obj); 267 Klass* k = o->klass(); 268 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) { 269 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity"); 270 needs_barrier = true; 271 } 272 } 273 } 274 275 if (needs_barrier) { 276 oop referent = JNIHandles::resolve(ret); 277 G1SATBCardTableModRefBS::enqueue(referent); 278 } 279 } 280 #endif // INCLUDE_ALL_GCS 281 return ret; 282 UNSAFE_END 283 284 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 285 UnsafeWrapper("Unsafe_SetObject"); 286 oop x = JNIHandles::resolve(x_h); 287 oop p = JNIHandles::resolve(obj); 288 if (UseCompressedOops) { 289 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 290 } else { 291 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 292 } 293 UNSAFE_END 294 295 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 296 UnsafeWrapper("Unsafe_GetObjectVolatile"); 297 oop p = JNIHandles::resolve(obj); 298 void* addr = index_oop_from_field_offset_long(p, offset); 299 volatile oop v; 300 if (UseCompressedOops) { 301 volatile narrowOop n = *(volatile narrowOop*) addr; 302 (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n)); 303 } else { 304 (void)const_cast<oop&>(v = *(volatile oop*) addr); 305 } 306 OrderAccess::acquire(); 307 return JNIHandles::make_local(env, v); 308 UNSAFE_END 309 310 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 311 UnsafeWrapper("Unsafe_SetObjectVolatile"); 312 oop x = JNIHandles::resolve(x_h); 313 oop p = JNIHandles::resolve(obj); 314 void* addr = index_oop_from_field_offset_long(p, offset); 315 OrderAccess::release(); 316 if (UseCompressedOops) { 317 oop_store((narrowOop*)addr, x); 318 } else { 319 oop_store((oop*)addr, x); 320 } 321 OrderAccess::fence(); 322 UNSAFE_END 323 324 #ifndef SUPPORTS_NATIVE_CX8 325 // Keep old code for platforms which may not have atomic jlong (8 bytes) instructions 326 327 // Volatile long versions must use locks if !VM_Version::supports_cx8(). 328 // support_cx8 is a surrogate for 'supports atomic long memory ops'. 329 330 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 331 UnsafeWrapper("Unsafe_GetLongVolatile"); 332 { 333 if (VM_Version::supports_cx8()) { 334 GET_FIELD_VOLATILE(obj, offset, jlong, v); 335 return v; 336 } 337 else { 338 Handle p (THREAD, JNIHandles::resolve(obj)); 339 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 340 ObjectLocker ol(p, THREAD); 341 jlong value = *addr; 342 return value; 343 } 344 } 345 UNSAFE_END 346 347 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) 348 UnsafeWrapper("Unsafe_SetLongVolatile"); 349 { 350 if (VM_Version::supports_cx8()) { 351 SET_FIELD_VOLATILE(obj, offset, jlong, x); 352 } 353 else { 354 Handle p (THREAD, JNIHandles::resolve(obj)); 355 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 356 ObjectLocker ol(p, THREAD); 357 *addr = x; 358 } 359 } 360 UNSAFE_END 361 362 #endif // not SUPPORTS_NATIVE_CX8 363 364 #define DEFINE_GETSETOOP(jboolean, Boolean) \ 365 \ 366 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \ 367 UnsafeWrapper("Unsafe_Get"#Boolean); \ 368 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \ 369 GET_FIELD(obj, offset, jboolean, v); \ 370 return v; \ 371 UNSAFE_END \ 372 \ 373 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \ 374 UnsafeWrapper("Unsafe_Set"#Boolean); \ 375 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \ 376 SET_FIELD(obj, offset, jboolean, x); \ 377 UNSAFE_END \ 378 \ 379 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \ 380 UnsafeWrapper("Unsafe_Get"#Boolean); \ 381 GET_FIELD(obj, offset, jboolean, v); \ 382 return v; \ 383 UNSAFE_END \ 384 \ 385 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \ 386 UnsafeWrapper("Unsafe_Set"#Boolean); \ 387 SET_FIELD(obj, offset, jboolean, x); \ 388 UNSAFE_END \ 389 \ 390 // END DEFINE_GETSETOOP. 391 392 DEFINE_GETSETOOP(jboolean, Boolean) 393 DEFINE_GETSETOOP(jbyte, Byte) 394 DEFINE_GETSETOOP(jshort, Short); 395 DEFINE_GETSETOOP(jchar, Char); 396 DEFINE_GETSETOOP(jint, Int); 397 DEFINE_GETSETOOP(jlong, Long); 398 DEFINE_GETSETOOP(jfloat, Float); 399 DEFINE_GETSETOOP(jdouble, Double); 400 401 #undef DEFINE_GETSETOOP 402 403 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \ 404 \ 405 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \ 406 UnsafeWrapper("Unsafe_Get"#Boolean); \ 407 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \ 408 return v; \ 409 UNSAFE_END \ 410 \ 411 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \ 412 UnsafeWrapper("Unsafe_Set"#Boolean); \ 413 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \ 414 UNSAFE_END \ 415 \ 416 // END DEFINE_GETSETOOP_VOLATILE. 417 418 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) 419 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte) 420 DEFINE_GETSETOOP_VOLATILE(jshort, Short); 421 DEFINE_GETSETOOP_VOLATILE(jchar, Char); 422 DEFINE_GETSETOOP_VOLATILE(jint, Int); 423 DEFINE_GETSETOOP_VOLATILE(jfloat, Float); 424 DEFINE_GETSETOOP_VOLATILE(jdouble, Double); 425 426 #ifdef SUPPORTS_NATIVE_CX8 427 DEFINE_GETSETOOP_VOLATILE(jlong, Long); 428 #endif 429 430 #undef DEFINE_GETSETOOP_VOLATILE 431 432 // The non-intrinsified versions of setOrdered just use setVolatile 433 434 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x)) 435 UnsafeWrapper("Unsafe_SetOrderedInt"); 436 SET_FIELD_VOLATILE(obj, offset, jint, x); 437 UNSAFE_END 438 439 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 440 UnsafeWrapper("Unsafe_SetOrderedObject"); 441 oop x = JNIHandles::resolve(x_h); 442 oop p = JNIHandles::resolve(obj); 443 void* addr = index_oop_from_field_offset_long(p, offset); 444 OrderAccess::release(); 445 if (UseCompressedOops) { 446 oop_store((narrowOop*)addr, x); 447 } else { 448 oop_store((oop*)addr, x); 449 } 450 OrderAccess::fence(); 451 UNSAFE_END 452 453 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) 454 UnsafeWrapper("Unsafe_SetOrderedLong"); 455 #ifdef SUPPORTS_NATIVE_CX8 456 SET_FIELD_VOLATILE(obj, offset, jlong, x); 457 #else 458 // Keep old code for platforms which may not have atomic long (8 bytes) instructions 459 { 460 if (VM_Version::supports_cx8()) { 461 SET_FIELD_VOLATILE(obj, offset, jlong, x); 462 } 463 else { 464 Handle p (THREAD, JNIHandles::resolve(obj)); 465 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 466 ObjectLocker ol(p, THREAD); 467 *addr = x; 468 } 469 } 470 #endif 471 UNSAFE_END 472 473 UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe)) 474 UnsafeWrapper("Unsafe_LoadFence"); 475 OrderAccess::acquire(); 476 UNSAFE_END 477 478 UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe)) 479 UnsafeWrapper("Unsafe_StoreFence"); 480 OrderAccess::release(); 481 UNSAFE_END 482 483 UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe)) 484 UnsafeWrapper("Unsafe_FullFence"); 485 OrderAccess::fence(); 486 UNSAFE_END 487 488 ////// Data in the C heap. 489 490 // Note: These do not throw NullPointerException for bad pointers. 491 // They just crash. Only a oop base pointer can generate a NullPointerException. 492 // 493 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \ 494 \ 495 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \ 496 UnsafeWrapper("Unsafe_GetNative"#Type); \ 497 void* p = addr_from_java(addr); \ 498 JavaThread* t = JavaThread::current(); \ 499 t->set_doing_unsafe_access(true); \ 500 java_type x = *(volatile native_type*)p; \ 501 t->set_doing_unsafe_access(false); \ 502 return x; \ 503 UNSAFE_END \ 504 \ 505 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \ 506 UnsafeWrapper("Unsafe_SetNative"#Type); \ 507 JavaThread* t = JavaThread::current(); \ 508 t->set_doing_unsafe_access(true); \ 509 void* p = addr_from_java(addr); \ 510 *(volatile native_type*)p = x; \ 511 t->set_doing_unsafe_access(false); \ 512 UNSAFE_END \ 513 \ 514 // END DEFINE_GETSETNATIVE. 515 516 DEFINE_GETSETNATIVE(jbyte, Byte, signed char) 517 DEFINE_GETSETNATIVE(jshort, Short, signed short); 518 DEFINE_GETSETNATIVE(jchar, Char, unsigned short); 519 DEFINE_GETSETNATIVE(jint, Int, jint); 520 // no long -- handled specially 521 DEFINE_GETSETNATIVE(jfloat, Float, float); 522 DEFINE_GETSETNATIVE(jdouble, Double, double); 523 524 #undef DEFINE_GETSETNATIVE 525 526 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr)) 527 UnsafeWrapper("Unsafe_GetNativeLong"); 528 JavaThread* t = JavaThread::current(); 529 // We do it this way to avoid problems with access to heap using 64 530 // bit loads, as jlong in heap could be not 64-bit aligned, and on 531 // some CPUs (SPARC) it leads to SIGBUS. 532 t->set_doing_unsafe_access(true); 533 void* p = addr_from_java(addr); 534 jlong x; 535 if (((intptr_t)p & 7) == 0) { 536 // jlong is aligned, do a volatile access 537 x = *(volatile jlong*)p; 538 } else { 539 jlong_accessor acc; 540 acc.words[0] = ((volatile jint*)p)[0]; 541 acc.words[1] = ((volatile jint*)p)[1]; 542 x = acc.long_value; 543 } 544 t->set_doing_unsafe_access(false); 545 return x; 546 UNSAFE_END 547 548 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 549 UnsafeWrapper("Unsafe_SetNativeLong"); 550 JavaThread* t = JavaThread::current(); 551 // see comment for Unsafe_GetNativeLong 552 t->set_doing_unsafe_access(true); 553 void* p = addr_from_java(addr); 554 if (((intptr_t)p & 7) == 0) { 555 // jlong is aligned, do a volatile access 556 *(volatile jlong*)p = x; 557 } else { 558 jlong_accessor acc; 559 acc.long_value = x; 560 ((volatile jint*)p)[0] = acc.words[0]; 561 ((volatile jint*)p)[1] = acc.words[1]; 562 } 563 t->set_doing_unsafe_access(false); 564 UNSAFE_END 565 566 567 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr)) 568 UnsafeWrapper("Unsafe_GetNativeAddress"); 569 void* p = addr_from_java(addr); 570 return addr_to_java(*(void**)p); 571 UNSAFE_END 572 573 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 574 UnsafeWrapper("Unsafe_SetNativeAddress"); 575 void* p = addr_from_java(addr); 576 *(void**)p = addr_from_java(x); 577 UNSAFE_END 578 579 580 ////// Allocation requests 581 582 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls)) 583 UnsafeWrapper("Unsafe_AllocateInstance"); 584 { 585 ThreadToNativeFromVM ttnfv(thread); 586 return env->AllocObject(cls); 587 } 588 UNSAFE_END 589 590 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size)) 591 UnsafeWrapper("Unsafe_AllocateMemory"); 592 size_t sz = (size_t)size; 593 if (sz != (julong)size || size < 0) { 594 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 595 } 596 if (sz == 0) { 597 return 0; 598 } 599 sz = round_to(sz, HeapWordSize); 600 void* x = os::malloc(sz, mtInternal); 601 if (x == NULL) { 602 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 603 } 604 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize); 605 return addr_to_java(x); 606 UNSAFE_END 607 608 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size)) 609 UnsafeWrapper("Unsafe_ReallocateMemory"); 610 void* p = addr_from_java(addr); 611 size_t sz = (size_t)size; 612 if (sz != (julong)size || size < 0) { 613 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 614 } 615 if (sz == 0) { 616 os::free(p); 617 return 0; 618 } 619 sz = round_to(sz, HeapWordSize); 620 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal); 621 if (x == NULL) { 622 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 623 } 624 return addr_to_java(x); 625 UNSAFE_END 626 627 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr)) 628 UnsafeWrapper("Unsafe_FreeMemory"); 629 void* p = addr_from_java(addr); 630 if (p == NULL) { 631 return; 632 } 633 os::free(p); 634 UNSAFE_END 635 636 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value)) 637 UnsafeWrapper("Unsafe_SetMemory"); 638 size_t sz = (size_t)size; 639 if (sz != (julong)size || size < 0) { 640 THROW(vmSymbols::java_lang_IllegalArgumentException()); 641 } 642 char* p = (char*) addr_from_java(addr); 643 Copy::fill_to_memory_atomic(p, sz, value); 644 UNSAFE_END 645 646 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value)) 647 UnsafeWrapper("Unsafe_SetMemory"); 648 size_t sz = (size_t)size; 649 if (sz != (julong)size || size < 0) { 650 THROW(vmSymbols::java_lang_IllegalArgumentException()); 651 } 652 oop base = JNIHandles::resolve(obj); 653 void* p = index_oop_from_field_offset_long(base, offset); 654 Copy::fill_to_memory_atomic(p, sz, value); 655 UNSAFE_END 656 657 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size)) 658 UnsafeWrapper("Unsafe_CopyMemory"); 659 if (size == 0) { 660 return; 661 } 662 size_t sz = (size_t)size; 663 if (sz != (julong)size || size < 0) { 664 THROW(vmSymbols::java_lang_IllegalArgumentException()); 665 } 666 void* src = addr_from_java(srcAddr); 667 void* dst = addr_from_java(dstAddr); 668 Copy::conjoint_memory_atomic(src, dst, sz); 669 UNSAFE_END 670 671 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size)) 672 UnsafeWrapper("Unsafe_CopyMemory"); 673 if (size == 0) { 674 return; 675 } 676 size_t sz = (size_t)size; 677 if (sz != (julong)size || size < 0) { 678 THROW(vmSymbols::java_lang_IllegalArgumentException()); 679 } 680 oop srcp = JNIHandles::resolve(srcObj); 681 oop dstp = JNIHandles::resolve(dstObj); 682 if (dstp != NULL && !dstp->is_typeArray()) { 683 // NYI: This works only for non-oop arrays at present. 684 // Generalizing it would be reasonable, but requires card marking. 685 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad. 686 THROW(vmSymbols::java_lang_IllegalArgumentException()); 687 } 688 void* src = index_oop_from_field_offset_long(srcp, srcOffset); 689 void* dst = index_oop_from_field_offset_long(dstp, dstOffset); 690 Copy::conjoint_memory_atomic(src, dst, sz); 691 UNSAFE_END 692 693 694 ////// Random queries 695 696 // See comment at file start about UNSAFE_LEAF 697 //UNSAFE_LEAF(jint, Unsafe_AddressSize()) 698 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe)) 699 UnsafeWrapper("Unsafe_AddressSize"); 700 return sizeof(void*); 701 UNSAFE_END 702 703 // See comment at file start about UNSAFE_LEAF 704 //UNSAFE_LEAF(jint, Unsafe_PageSize()) 705 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe)) 706 UnsafeWrapper("Unsafe_PageSize"); 707 return os::vm_page_size(); 708 UNSAFE_END 709 710 jint find_field_offset(jobject field, int must_be_static, TRAPS) { 711 if (field == NULL) { 712 THROW_0(vmSymbols::java_lang_NullPointerException()); 713 } 714 715 oop reflected = JNIHandles::resolve_non_null(field); 716 oop mirror = java_lang_reflect_Field::clazz(reflected); 717 Klass* k = java_lang_Class::as_Klass(mirror); 718 int slot = java_lang_reflect_Field::slot(reflected); 719 int modifiers = java_lang_reflect_Field::modifiers(reflected); 720 721 if (must_be_static >= 0) { 722 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0); 723 if (must_be_static != really_is_static) { 724 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 725 } 726 } 727 728 int offset = InstanceKlass::cast(k)->field_offset(slot); 729 return field_offset_from_byte_offset(offset); 730 } 731 732 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 733 UnsafeWrapper("Unsafe_ObjectFieldOffset"); 734 return find_field_offset(field, 0, THREAD); 735 UNSAFE_END 736 737 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 738 UnsafeWrapper("Unsafe_StaticFieldOffset"); 739 return find_field_offset(field, 1, THREAD); 740 UNSAFE_END 741 742 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field)) 743 UnsafeWrapper("Unsafe_StaticFieldBase"); 744 // Note: In this VM implementation, a field address is always a short 745 // offset from the base of a a klass metaobject. Thus, the full dynamic 746 // range of the return type is never used. However, some implementations 747 // might put the static field inside an array shared by many classes, 748 // or even at a fixed address, in which case the address could be quite 749 // large. In that last case, this function would return NULL, since 750 // the address would operate alone, without any base pointer. 751 752 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); 753 754 oop reflected = JNIHandles::resolve_non_null(field); 755 oop mirror = java_lang_reflect_Field::clazz(reflected); 756 int modifiers = java_lang_reflect_Field::modifiers(reflected); 757 758 if ((modifiers & JVM_ACC_STATIC) == 0) { 759 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 760 } 761 762 return JNIHandles::make_local(env, mirror); 763 UNSAFE_END 764 765 //@deprecated 766 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 767 UnsafeWrapper("Unsafe_FieldOffset"); 768 // tries (but fails) to be polymorphic between static and non-static: 769 jlong offset = find_field_offset(field, -1, THREAD); 770 guarantee(offset == (jint)offset, "offset fits in 32 bits"); 771 return (jint)offset; 772 UNSAFE_END 773 774 //@deprecated 775 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz)) 776 UnsafeWrapper("Unsafe_StaticFieldBase"); 777 if (clazz == NULL) { 778 THROW_0(vmSymbols::java_lang_NullPointerException()); 779 } 780 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz)); 781 UNSAFE_END 782 783 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) { 784 UnsafeWrapper("Unsafe_EnsureClassInitialized"); 785 if (clazz == NULL) { 786 THROW(vmSymbols::java_lang_NullPointerException()); 787 } 788 oop mirror = JNIHandles::resolve_non_null(clazz); 789 790 Klass* klass = java_lang_Class::as_Klass(mirror); 791 if (klass != NULL && klass->should_be_initialized()) { 792 InstanceKlass* k = InstanceKlass::cast(klass); 793 k->initialize(CHECK); 794 } 795 } 796 UNSAFE_END 797 798 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) { 799 UnsafeWrapper("Unsafe_ShouldBeInitialized"); 800 if (clazz == NULL) { 801 THROW_(vmSymbols::java_lang_NullPointerException(), false); 802 } 803 oop mirror = JNIHandles::resolve_non_null(clazz); 804 Klass* klass = java_lang_Class::as_Klass(mirror); 805 if (klass != NULL && klass->should_be_initialized()) { 806 return true; 807 } 808 return false; 809 } 810 UNSAFE_END 811 812 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) { 813 if (acls == NULL) { 814 THROW(vmSymbols::java_lang_NullPointerException()); 815 } 816 oop mirror = JNIHandles::resolve_non_null(acls); 817 Klass* k = java_lang_Class::as_Klass(mirror); 818 if (k == NULL || !k->oop_is_array()) { 819 THROW(vmSymbols::java_lang_InvalidClassException()); 820 } else if (k->oop_is_objArray()) { 821 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT); 822 scale = heapOopSize; 823 } else if (k->oop_is_typeArray()) { 824 TypeArrayKlass* tak = TypeArrayKlass::cast(k); 825 base = tak->array_header_in_bytes(); 826 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok"); 827 scale = (1 << tak->log2_element_size()); 828 } else { 829 ShouldNotReachHere(); 830 } 831 } 832 833 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls)) 834 UnsafeWrapper("Unsafe_ArrayBaseOffset"); 835 int base, scale; 836 getBaseAndScale(base, scale, acls, CHECK_0); 837 return field_offset_from_byte_offset(base); 838 UNSAFE_END 839 840 841 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls)) 842 UnsafeWrapper("Unsafe_ArrayIndexScale"); 843 int base, scale; 844 getBaseAndScale(base, scale, acls, CHECK_0); 845 // This VM packs both fields and array elements down to the byte. 846 // But watch out: If this changes, so that array references for 847 // a given primitive type (say, T_BOOLEAN) use different memory units 848 // than fields, this method MUST return zero for such arrays. 849 // For example, the VM used to store sub-word sized fields in full 850 // words in the object layout, so that accessors like getByte(Object,int) 851 // did not really do what one might expect for arrays. Therefore, 852 // this function used to report a zero scale factor, so that the user 853 // would know not to attempt to access sub-word array elements. 854 // // Code for unpacked fields: 855 // if (scale < wordSize) return 0; 856 857 // The following allows for a pretty general fieldOffset cookie scheme, 858 // but requires it to be linear in byte offset. 859 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0); 860 UNSAFE_END 861 862 863 static inline void throw_new(JNIEnv *env, const char *ename) { 864 char buf[100]; 865 strcpy(buf, "java/lang/"); 866 strcat(buf, ename); 867 jclass cls = env->FindClass(buf); 868 if (env->ExceptionCheck()) { 869 env->ExceptionClear(); 870 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf); 871 return; 872 } 873 char* msg = NULL; 874 env->ThrowNew(cls, msg); 875 } 876 877 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) { 878 { 879 // Code lifted from JDK 1.3 ClassLoader.c 880 881 jbyte *body; 882 char *utfName; 883 jclass result = 0; 884 char buf[128]; 885 886 if (UsePerfData) { 887 ClassLoader::unsafe_defineClassCallCounter()->inc(); 888 } 889 890 if (data == NULL) { 891 throw_new(env, "NullPointerException"); 892 return 0; 893 } 894 895 /* Work around 4153825. malloc crashes on Solaris when passed a 896 * negative size. 897 */ 898 if (length < 0) { 899 throw_new(env, "ArrayIndexOutOfBoundsException"); 900 return 0; 901 } 902 903 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal); 904 905 if (body == 0) { 906 throw_new(env, "OutOfMemoryError"); 907 return 0; 908 } 909 910 env->GetByteArrayRegion(data, offset, length, body); 911 912 if (env->ExceptionOccurred()) 913 goto free_body; 914 915 if (name != NULL) { 916 uint len = env->GetStringUTFLength(name); 917 int unicode_len = env->GetStringLength(name); 918 if (len >= sizeof(buf)) { 919 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 920 if (utfName == NULL) { 921 throw_new(env, "OutOfMemoryError"); 922 goto free_body; 923 } 924 } else { 925 utfName = buf; 926 } 927 env->GetStringUTFRegion(name, 0, unicode_len, utfName); 928 //VerifyFixClassname(utfName); 929 for (uint i = 0; i < len; i++) { 930 if (utfName[i] == '.') utfName[i] = '/'; 931 } 932 } else { 933 utfName = NULL; 934 } 935 936 result = JVM_DefineClass(env, utfName, loader, body, length, pd); 937 938 if (utfName && utfName != buf) 939 FREE_C_HEAP_ARRAY(char, utfName, mtInternal); 940 941 free_body: 942 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal); 943 return result; 944 } 945 } 946 947 948 UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd)) 949 UnsafeWrapper("Unsafe_DefineClass"); 950 { 951 ThreadToNativeFromVM ttnfv(thread); 952 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd); 953 } 954 UNSAFE_END 955 956 957 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length)) 958 UnsafeWrapper("Unsafe_DefineClass"); 959 { 960 ThreadToNativeFromVM ttnfv(thread); 961 962 int depthFromDefineClass0 = 1; 963 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0); 964 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller); 965 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller); 966 967 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd); 968 } 969 UNSAFE_END 970 971 972 #define DAC_Args CLS"[B["OBJ 973 // define a class but do not make it known to the class loader or system dictionary 974 // - host_class: supplies context for linkage, access control, protection domain, and class loader 975 // - data: bytes of a class file, a raw memory address (length gives the number of bytes) 976 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data 977 978 // When you load an anonymous class U, it works as if you changed its name just before loading, 979 // to a name that you will never use again. Since the name is lost, no other class can directly 980 // link to any member of U. Just after U is loaded, the only way to use it is reflectively, 981 // through java.lang.Class methods like Class.newInstance. 982 983 // Access checks for linkage sites within U continue to follow the same rules as for named classes. 984 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded. 985 // An anonymous class also has special privileges to access any member of its host class. 986 // This is the main reason why this loading operation is unsafe. The purpose of this is to 987 // allow language implementations to simulate "open classes"; a host class in effect gets 988 // new code when an anonymous class is loaded alongside it. A less convenient but more 989 // standard way to do this is with reflection, which can also be set to ignore access 990 // restrictions. 991 992 // Access into an anonymous class is possible only through reflection. Therefore, there 993 // are no special access rules for calling into an anonymous class. The relaxed access 994 // rule for the host class is applied in the opposite direction: A host class reflectively 995 // access one of its anonymous classes. 996 997 // If you load the same bytecodes twice, you get two different classes. You can reload 998 // the same bytecodes with or without varying CP patches. 999 1000 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1. 1001 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is). 1002 // The CONSTANT_Class entry for that name can be patched to refer directly to U1. 1003 1004 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as 1005 // an outer class (so that U2 is an anonymous inner class of anonymous U1). 1006 // It is not possible for a named class, or an older anonymous class, to refer by 1007 // name (via its CP) to a newer anonymous class. 1008 1009 // CP patching may also be used to modify (i.e., hack) the names of methods, classes, 1010 // or type descriptors used in the loaded anonymous class. 1011 1012 // Finally, CP patching may be used to introduce "live" objects into the constant pool, 1013 // instead of "dead" strings. A compiled statement like println((Object)"hello") can 1014 // be changed to println(greeting), where greeting is an arbitrary object created before 1015 // the anonymous class is loaded. This is useful in dynamic languages, in which 1016 // various kinds of metaobjects must be introduced as constants into bytecode. 1017 // Note the cast (Object), which tells the verifier to expect an arbitrary object, 1018 // not just a literal string. For such ldc instructions, the verifier uses the 1019 // type Object instead of String, if the loaded constant is not in fact a String. 1020 1021 static instanceKlassHandle 1022 Unsafe_DefineAnonymousClass_impl(JNIEnv *env, 1023 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh, 1024 HeapWord* *temp_alloc, 1025 TRAPS) { 1026 1027 if (UsePerfData) { 1028 ClassLoader::unsafe_defineClassCallCounter()->inc(); 1029 } 1030 1031 if (data == NULL) { 1032 THROW_0(vmSymbols::java_lang_NullPointerException()); 1033 } 1034 1035 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length(); 1036 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord); 1037 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal); 1038 if (body == NULL) { 1039 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 1040 } 1041 1042 // caller responsible to free it: 1043 (*temp_alloc) = body; 1044 1045 { 1046 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0); 1047 Copy::conjoint_words((HeapWord*) array_base, body, word_length); 1048 } 1049 1050 u1* class_bytes = (u1*) body; 1051 int class_bytes_length = (int) length; 1052 if (class_bytes_length < 0) class_bytes_length = 0; 1053 if (class_bytes == NULL 1054 || host_class == NULL 1055 || length != class_bytes_length) 1056 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 1057 1058 objArrayHandle cp_patches_h; 1059 if (cp_patches_jh != NULL) { 1060 oop p = JNIHandles::resolve_non_null(cp_patches_jh); 1061 if (!p->is_objArray()) 1062 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 1063 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p); 1064 } 1065 1066 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class))); 1067 const char* host_source = host_klass->external_name(); 1068 Handle host_loader(THREAD, host_klass->class_loader()); 1069 Handle host_domain(THREAD, host_klass->protection_domain()); 1070 1071 GrowableArray<Handle>* cp_patches = NULL; 1072 if (cp_patches_h.not_null()) { 1073 int alen = cp_patches_h->length(); 1074 for (int i = alen-1; i >= 0; i--) { 1075 oop p = cp_patches_h->obj_at(i); 1076 if (p != NULL) { 1077 Handle patch(THREAD, p); 1078 if (cp_patches == NULL) 1079 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle()); 1080 cp_patches->at_put(i, patch); 1081 } 1082 } 1083 } 1084 1085 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source); 1086 1087 instanceKlassHandle anon_klass; 1088 { 1089 Symbol* no_class_name = NULL; 1090 Klass* anonk = SystemDictionary::parse_stream(no_class_name, 1091 host_loader, host_domain, 1092 &st, host_klass, cp_patches, 1093 CHECK_NULL); 1094 if (anonk == NULL) return NULL; 1095 anon_klass = instanceKlassHandle(THREAD, anonk); 1096 } 1097 1098 return anon_klass; 1099 } 1100 1101 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh)) 1102 { 1103 instanceKlassHandle anon_klass; 1104 jobject res_jh = NULL; 1105 1106 UnsafeWrapper("Unsafe_DefineAnonymousClass"); 1107 ResourceMark rm(THREAD); 1108 1109 HeapWord* temp_alloc = NULL; 1110 1111 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data, 1112 cp_patches_jh, 1113 &temp_alloc, THREAD); 1114 if (anon_klass() != NULL) 1115 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror()); 1116 1117 // try/finally clause: 1118 if (temp_alloc != NULL) { 1119 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal); 1120 } 1121 1122 // The anonymous class loader data has been artificially been kept alive to 1123 // this point. The mirror and any instances of this class have to keep 1124 // it alive afterwards. 1125 if (anon_klass() != NULL) { 1126 anon_klass->class_loader_data()->set_keep_alive(false); 1127 } 1128 1129 // let caller initialize it as needed... 1130 1131 return (jclass) res_jh; 1132 } 1133 UNSAFE_END 1134 1135 1136 1137 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 1138 UnsafeWrapper("Unsafe_MonitorEnter"); 1139 { 1140 if (jobj == NULL) { 1141 THROW(vmSymbols::java_lang_NullPointerException()); 1142 } 1143 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 1144 ObjectSynchronizer::jni_enter(obj, CHECK); 1145 } 1146 UNSAFE_END 1147 1148 1149 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 1150 UnsafeWrapper("Unsafe_TryMonitorEnter"); 1151 { 1152 if (jobj == NULL) { 1153 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 1154 } 1155 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 1156 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0); 1157 return (res ? JNI_TRUE : JNI_FALSE); 1158 } 1159 UNSAFE_END 1160 1161 1162 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj)) 1163 UnsafeWrapper("Unsafe_MonitorExit"); 1164 { 1165 if (jobj == NULL) { 1166 THROW(vmSymbols::java_lang_NullPointerException()); 1167 } 1168 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj)); 1169 ObjectSynchronizer::jni_exit(obj(), CHECK); 1170 } 1171 UNSAFE_END 1172 1173 1174 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr)) 1175 UnsafeWrapper("Unsafe_ThrowException"); 1176 { 1177 ThreadToNativeFromVM ttnfv(thread); 1178 env->Throw(thr); 1179 } 1180 UNSAFE_END 1181 1182 // JSR166 ------------------------------------------------------------------ 1183 1184 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h)) 1185 UnsafeWrapper("Unsafe_CompareAndSwapObject"); 1186 oop x = JNIHandles::resolve(x_h); 1187 oop e = JNIHandles::resolve(e_h); 1188 oop p = JNIHandles::resolve(obj); 1189 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset); 1190 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true); 1191 jboolean success = (res == e); 1192 if (success) 1193 update_barrier_set((void*)addr, x); 1194 return success; 1195 UNSAFE_END 1196 1197 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x)) 1198 UnsafeWrapper("Unsafe_CompareAndSwapInt"); 1199 oop p = JNIHandles::resolve(obj); 1200 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset); 1201 return (jint)(Atomic::cmpxchg(x, addr, e)) == e; 1202 UNSAFE_END 1203 1204 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x)) 1205 UnsafeWrapper("Unsafe_CompareAndSwapLong"); 1206 Handle p (THREAD, JNIHandles::resolve(obj)); 1207 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 1208 if (VM_Version::supports_cx8()) 1209 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e; 1210 else { 1211 jboolean success = false; 1212 ObjectLocker ol(p, THREAD); 1213 if (*addr == e) { *addr = x; success = true; } 1214 return success; 1215 } 1216 UNSAFE_END 1217 1218 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time)) 1219 UnsafeWrapper("Unsafe_Park"); 1220 EventThreadPark event; 1221 #ifndef USDT2 1222 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time); 1223 #else /* USDT2 */ 1224 HOTSPOT_THREAD_PARK_BEGIN( 1225 (uintptr_t) thread->parker(), (int) isAbsolute, time); 1226 #endif /* USDT2 */ 1227 JavaThreadParkedState jtps(thread, time != 0); 1228 thread->parker()->park(isAbsolute != 0, time); 1229 #ifndef USDT2 1230 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker()); 1231 #else /* USDT2 */ 1232 HOTSPOT_THREAD_PARK_END( 1233 (uintptr_t) thread->parker()); 1234 #endif /* USDT2 */ 1235 if (event.should_commit()) { 1236 oop obj = thread->current_park_blocker(); 1237 event.set_klass((obj != NULL) ? obj->klass() : NULL); 1238 event.set_timeout(time); 1239 event.set_address((obj != NULL) ? (TYPE_ADDRESS) cast_from_oop<uintptr_t>(obj) : 0); 1240 event.commit(); 1241 } 1242 UNSAFE_END 1243 1244 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread)) 1245 UnsafeWrapper("Unsafe_Unpark"); 1246 Parker* p = NULL; 1247 if (jthread != NULL) { 1248 oop java_thread = JNIHandles::resolve_non_null(jthread); 1249 if (java_thread != NULL) { 1250 jlong lp = java_lang_Thread::park_event(java_thread); 1251 if (lp != 0) { 1252 // This cast is OK even though the jlong might have been read 1253 // non-atomically on 32bit systems, since there, one word will 1254 // always be zero anyway and the value set is always the same 1255 p = (Parker*)addr_from_java(lp); 1256 } else { 1257 // Grab lock if apparently null or using older version of library 1258 MutexLocker mu(Threads_lock); 1259 java_thread = JNIHandles::resolve_non_null(jthread); 1260 if (java_thread != NULL) { 1261 JavaThread* thr = java_lang_Thread::thread(java_thread); 1262 if (thr != NULL) { 1263 p = thr->parker(); 1264 if (p != NULL) { // Bind to Java thread for next time. 1265 java_lang_Thread::set_park_event(java_thread, addr_to_java(p)); 1266 } 1267 } 1268 } 1269 } 1270 } 1271 } 1272 if (p != NULL) { 1273 #ifndef USDT2 1274 HS_DTRACE_PROBE1(hotspot, thread__unpark, p); 1275 #else /* USDT2 */ 1276 HOTSPOT_THREAD_UNPARK( 1277 (uintptr_t) p); 1278 #endif /* USDT2 */ 1279 p->unpark(); 1280 } 1281 UNSAFE_END 1282 1283 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem)) 1284 UnsafeWrapper("Unsafe_Loadavg"); 1285 const int max_nelem = 3; 1286 double la[max_nelem]; 1287 jint ret; 1288 1289 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg)); 1290 assert(a->is_typeArray(), "must be type array"); 1291 1292 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) { 1293 ThreadToNativeFromVM ttnfv(thread); 1294 throw_new(env, "ArrayIndexOutOfBoundsException"); 1295 return -1; 1296 } 1297 1298 ret = os::loadavg(la, nelem); 1299 if (ret == -1) return -1; 1300 1301 // if successful, ret is the number of samples actually retrieved. 1302 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value"); 1303 switch(ret) { 1304 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through 1305 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through 1306 case 1: a->double_at_put(0, (jdouble)la[0]); break; 1307 } 1308 return ret; 1309 UNSAFE_END 1310 1311 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 1312 UnsafeWrapper("Unsafe_PrefetchRead"); 1313 oop p = JNIHandles::resolve(obj); 1314 void* addr = index_oop_from_field_offset_long(p, 0); 1315 Prefetch::read(addr, (intx)offset); 1316 UNSAFE_END 1317 1318 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 1319 UnsafeWrapper("Unsafe_PrefetchWrite"); 1320 oop p = JNIHandles::resolve(obj); 1321 void* addr = index_oop_from_field_offset_long(p, 0); 1322 Prefetch::write(addr, (intx)offset); 1323 UNSAFE_END 1324 1325 1326 /// JVM_RegisterUnsafeMethods 1327 1328 #define ADR "J" 1329 1330 #define LANG "Ljava/lang/" 1331 1332 #define OBJ LANG"Object;" 1333 #define CLS LANG"Class;" 1334 #define CTR LANG"reflect/Constructor;" 1335 #define FLD LANG"reflect/Field;" 1336 #define MTH LANG"reflect/Method;" 1337 #define THR LANG"Throwable;" 1338 1339 #define DC0_Args LANG"String;[BII" 1340 #define DC_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;" 1341 1342 #define CC (char*) /*cast a literal from (const char*)*/ 1343 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1344 1345 // define deprecated accessors for compabitility with 1.4.0 1346 #define DECLARE_GETSETOOP_140(Boolean, Z) \ 1347 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \ 1348 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)} 1349 1350 // Note: In 1.4.1, getObject and kin take both int and long offsets. 1351 #define DECLARE_GETSETOOP_141(Boolean, Z) \ 1352 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1353 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)} 1354 1355 // Note: In 1.5.0, there are volatile versions too 1356 #define DECLARE_GETSETOOP(Boolean, Z) \ 1357 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1358 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \ 1359 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \ 1360 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)} 1361 1362 1363 #define DECLARE_GETSETNATIVE(Byte, B) \ 1364 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \ 1365 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)} 1366 1367 1368 1369 // These are the methods for 1.4.0 1370 static JNINativeMethod methods_140[] = { 1371 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)}, 1372 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)}, 1373 1374 DECLARE_GETSETOOP_140(Boolean, Z), 1375 DECLARE_GETSETOOP_140(Byte, B), 1376 DECLARE_GETSETOOP_140(Short, S), 1377 DECLARE_GETSETOOP_140(Char, C), 1378 DECLARE_GETSETOOP_140(Int, I), 1379 DECLARE_GETSETOOP_140(Long, J), 1380 DECLARE_GETSETOOP_140(Float, F), 1381 DECLARE_GETSETOOP_140(Double, D), 1382 1383 DECLARE_GETSETNATIVE(Byte, B), 1384 DECLARE_GETSETNATIVE(Short, S), 1385 DECLARE_GETSETNATIVE(Char, C), 1386 DECLARE_GETSETNATIVE(Int, I), 1387 DECLARE_GETSETNATIVE(Long, J), 1388 DECLARE_GETSETNATIVE(Float, F), 1389 DECLARE_GETSETNATIVE(Double, D), 1390 1391 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1392 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1393 1394 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1395 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1396 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1397 1398 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, 1399 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, 1400 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1401 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1402 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1403 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1404 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1405 1406 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1407 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1408 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1409 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1410 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1411 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)} 1412 }; 1413 1414 // These are the methods prior to the JSR 166 changes in 1.5.0 1415 static JNINativeMethod methods_141[] = { 1416 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1417 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1418 1419 DECLARE_GETSETOOP_141(Boolean, Z), 1420 DECLARE_GETSETOOP_141(Byte, B), 1421 DECLARE_GETSETOOP_141(Short, S), 1422 DECLARE_GETSETOOP_141(Char, C), 1423 DECLARE_GETSETOOP_141(Int, I), 1424 DECLARE_GETSETOOP_141(Long, J), 1425 DECLARE_GETSETOOP_141(Float, F), 1426 DECLARE_GETSETOOP_141(Double, D), 1427 1428 DECLARE_GETSETNATIVE(Byte, B), 1429 DECLARE_GETSETNATIVE(Short, S), 1430 DECLARE_GETSETNATIVE(Char, C), 1431 DECLARE_GETSETNATIVE(Int, I), 1432 DECLARE_GETSETNATIVE(Long, J), 1433 DECLARE_GETSETNATIVE(Float, F), 1434 DECLARE_GETSETNATIVE(Double, D), 1435 1436 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1437 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1438 1439 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1440 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1441 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1442 1443 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1444 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1445 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1446 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1447 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1448 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1449 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1450 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1451 1452 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1453 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1454 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1455 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1456 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1457 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)} 1458 1459 }; 1460 1461 // These are the methods prior to the JSR 166 changes in 1.6.0 1462 static JNINativeMethod methods_15[] = { 1463 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1464 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1465 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1466 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1467 1468 1469 DECLARE_GETSETOOP(Boolean, Z), 1470 DECLARE_GETSETOOP(Byte, B), 1471 DECLARE_GETSETOOP(Short, S), 1472 DECLARE_GETSETOOP(Char, C), 1473 DECLARE_GETSETOOP(Int, I), 1474 DECLARE_GETSETOOP(Long, J), 1475 DECLARE_GETSETOOP(Float, F), 1476 DECLARE_GETSETOOP(Double, D), 1477 1478 DECLARE_GETSETNATIVE(Byte, B), 1479 DECLARE_GETSETNATIVE(Short, S), 1480 DECLARE_GETSETNATIVE(Char, C), 1481 DECLARE_GETSETNATIVE(Int, I), 1482 DECLARE_GETSETNATIVE(Long, J), 1483 DECLARE_GETSETNATIVE(Float, F), 1484 DECLARE_GETSETNATIVE(Double, D), 1485 1486 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1487 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1488 1489 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1490 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1491 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1492 1493 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1494 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1495 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1496 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1497 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1498 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1499 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1500 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1501 1502 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1503 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1504 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1505 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1506 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1507 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1508 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1509 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1510 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1511 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1512 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1513 1514 }; 1515 1516 // These are the methods for 1.6.0 and 1.7.0 1517 static JNINativeMethod methods_16[] = { 1518 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1519 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1520 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1521 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1522 1523 DECLARE_GETSETOOP(Boolean, Z), 1524 DECLARE_GETSETOOP(Byte, B), 1525 DECLARE_GETSETOOP(Short, S), 1526 DECLARE_GETSETOOP(Char, C), 1527 DECLARE_GETSETOOP(Int, I), 1528 DECLARE_GETSETOOP(Long, J), 1529 DECLARE_GETSETOOP(Float, F), 1530 DECLARE_GETSETOOP(Double, D), 1531 1532 DECLARE_GETSETNATIVE(Byte, B), 1533 DECLARE_GETSETNATIVE(Short, S), 1534 DECLARE_GETSETNATIVE(Char, C), 1535 DECLARE_GETSETNATIVE(Int, I), 1536 DECLARE_GETSETNATIVE(Long, J), 1537 DECLARE_GETSETNATIVE(Float, F), 1538 DECLARE_GETSETNATIVE(Double, D), 1539 1540 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1541 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1542 1543 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1544 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1545 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1546 1547 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1548 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1549 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1550 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1551 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1552 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1553 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1554 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1555 1556 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1557 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1558 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1559 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1560 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1561 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)}, 1562 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1563 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1564 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1565 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1566 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)}, 1567 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)}, 1568 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)}, 1569 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1570 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1571 }; 1572 1573 // These are the methods for 1.8.0 1574 static JNINativeMethod methods_18[] = { 1575 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1576 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1577 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1578 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1579 1580 DECLARE_GETSETOOP(Boolean, Z), 1581 DECLARE_GETSETOOP(Byte, B), 1582 DECLARE_GETSETOOP(Short, S), 1583 DECLARE_GETSETOOP(Char, C), 1584 DECLARE_GETSETOOP(Int, I), 1585 DECLARE_GETSETOOP(Long, J), 1586 DECLARE_GETSETOOP(Float, F), 1587 DECLARE_GETSETOOP(Double, D), 1588 1589 DECLARE_GETSETNATIVE(Byte, B), 1590 DECLARE_GETSETNATIVE(Short, S), 1591 DECLARE_GETSETNATIVE(Char, C), 1592 DECLARE_GETSETNATIVE(Int, I), 1593 DECLARE_GETSETNATIVE(Long, J), 1594 DECLARE_GETSETNATIVE(Float, F), 1595 DECLARE_GETSETNATIVE(Double, D), 1596 1597 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1598 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1599 1600 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1601 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1602 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1603 1604 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1605 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1606 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1607 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1608 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1609 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1610 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1611 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1612 1613 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1614 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1615 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1616 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1617 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)}, 1618 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1619 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1620 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1621 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1622 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)}, 1623 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)}, 1624 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)}, 1625 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1626 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1627 }; 1628 1629 JNINativeMethod loadavg_method[] = { 1630 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)} 1631 }; 1632 1633 JNINativeMethod prefetch_methods[] = { 1634 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1635 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}, 1636 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1637 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)} 1638 }; 1639 1640 JNINativeMethod memcopy_methods_17[] = { 1641 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)}, 1642 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)} 1643 }; 1644 1645 JNINativeMethod memcopy_methods_15[] = { 1646 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1647 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)} 1648 }; 1649 1650 JNINativeMethod anonk_methods[] = { 1651 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)}, 1652 }; 1653 1654 JNINativeMethod lform_methods[] = { 1655 {CC"shouldBeInitialized",CC"("CLS")Z", FN_PTR(Unsafe_ShouldBeInitialized)}, 1656 }; 1657 1658 JNINativeMethod fence_methods[] = { 1659 {CC"loadFence", CC"()V", FN_PTR(Unsafe_LoadFence)}, 1660 {CC"storeFence", CC"()V", FN_PTR(Unsafe_StoreFence)}, 1661 {CC"fullFence", CC"()V", FN_PTR(Unsafe_FullFence)}, 1662 }; 1663 1664 #undef CC 1665 #undef FN_PTR 1666 1667 #undef ADR 1668 #undef LANG 1669 #undef OBJ 1670 #undef CLS 1671 #undef CTR 1672 #undef FLD 1673 #undef MTH 1674 #undef THR 1675 #undef DC0_Args 1676 #undef DC_Args 1677 1678 #undef DECLARE_GETSETOOP 1679 #undef DECLARE_GETSETNATIVE 1680 1681 1682 /** 1683 * Helper method to register native methods. 1684 */ 1685 static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) { 1686 int status = env->RegisterNatives(clazz, methods, nMethods); 1687 if (status < 0 || env->ExceptionOccurred()) { 1688 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1689 tty->print_cr("Unsafe: failed registering %s", message); 1690 } 1691 env->ExceptionClear(); 1692 return false; 1693 } else { 1694 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1695 tty->print_cr("Unsafe: successfully registered %s", message); 1696 } 1697 return true; 1698 } 1699 } 1700 1701 1702 // This one function is exported, used by NativeLookup. 1703 // The Unsafe_xxx functions above are called only from the interpreter. 1704 // The optimizer looks at names and signatures to recognize 1705 // individual functions. 1706 1707 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls)) 1708 UnsafeWrapper("JVM_RegisterUnsafeMethods"); 1709 { 1710 ThreadToNativeFromVM ttnfv(thread); 1711 1712 // Unsafe methods 1713 { 1714 bool success = false; 1715 // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6 1716 if (!success) { 1717 success = register_natives("1.6 methods", env, unsafecls, methods_16, sizeof(methods_16)/sizeof(JNINativeMethod)); 1718 } 1719 if (!success) { 1720 success = register_natives("1.8 methods", env, unsafecls, methods_18, sizeof(methods_18)/sizeof(JNINativeMethod)); 1721 } 1722 if (!success) { 1723 success = register_natives("1.5 methods", env, unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod)); 1724 } 1725 if (!success) { 1726 success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod)); 1727 } 1728 if (!success) { 1729 success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod)); 1730 } 1731 guarantee(success, "register unsafe natives"); 1732 } 1733 1734 // Unsafe.getLoadAverage 1735 register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod)); 1736 1737 // Prefetch methods 1738 register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod)); 1739 1740 // Memory copy methods 1741 { 1742 bool success = false; 1743 if (!success) { 1744 success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod)); 1745 } 1746 if (!success) { 1747 success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod)); 1748 } 1749 } 1750 1751 // Unsafe.defineAnonymousClass 1752 if (EnableInvokeDynamic) { 1753 register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod)); 1754 } 1755 1756 // Unsafe.shouldBeInitialized 1757 if (EnableInvokeDynamic) { 1758 register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod)); 1759 } 1760 1761 // Fence methods 1762 register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod)); 1763 } 1764 JVM_END