1 /* 2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/vmSymbols.hpp" 27 #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/reflection.hpp" 37 #include "runtime/synchronizer.hpp" 38 #include "services/threadService.hpp" 39 #include "utilities/copy.hpp" 40 #include "utilities/dtrace.hpp" 41 42 /* 43 * Implementation of class sun.misc.Unsafe 44 */ 45 46 #ifndef USDT2 47 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long); 48 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t); 49 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t); 50 #endif /* !USDT2 */ 51 52 #define MAX_OBJECT_SIZE \ 53 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \ 54 + ((julong)max_jint * sizeof(double)) ) 55 56 57 #define UNSAFE_ENTRY(result_type, header) \ 58 JVM_ENTRY(result_type, header) 59 60 // Can't use UNSAFE_LEAF because it has the signature of a straight 61 // call into the runtime (just like JVM_LEAF, funny that) but it's 62 // called like a Java Native and thus the wrapper built for it passes 63 // arguments like a JNI call. It expects those arguments to be popped 64 // from the stack on Intel like all good JNI args are, and adjusts the 65 // stack according. Since the JVM_LEAF call expects no extra 66 // arguments the stack isn't popped in the C code, is pushed by the 67 // wrapper and we get sick. 68 //#define UNSAFE_LEAF(result_type, header) \ 69 // JVM_LEAF(result_type, header) 70 71 #define UNSAFE_END JVM_END 72 73 #define UnsafeWrapper(arg) /*nothing, for the present*/ 74 75 76 inline void* addr_from_java(jlong addr) { 77 // This assert fails in a variety of ways on 32-bit systems. 78 // It is impossible to predict whether native code that converts 79 // pointers to longs will sign-extend or zero-extend the addresses. 80 //assert(addr == (uintptr_t)addr, "must not be odd high bits"); 81 return (void*)(uintptr_t)addr; 82 } 83 84 inline jlong addr_to_java(void* p) { 85 assert(p == (void*)(uintptr_t)p, "must not be odd high bits"); 86 return (uintptr_t)p; 87 } 88 89 90 // Note: The VM's obj_field and related accessors use byte-scaled 91 // ("unscaled") offsets, just as the unsafe methods do. 92 93 // However, the method Unsafe.fieldOffset explicitly declines to 94 // guarantee this. The field offset values manipulated by the Java user 95 // through the Unsafe API are opaque cookies that just happen to be byte 96 // offsets. We represent this state of affairs by passing the cookies 97 // through conversion functions when going between the VM and the Unsafe API. 98 // The conversion functions just happen to be no-ops at present. 99 100 inline jlong field_offset_to_byte_offset(jlong field_offset) { 101 return field_offset; 102 } 103 104 inline jlong field_offset_from_byte_offset(jlong byte_offset) { 105 return byte_offset; 106 } 107 108 inline jint invocation_key_from_method_slot(jint slot) { 109 return slot; 110 } 111 112 inline jint invocation_key_to_method_slot(jint key) { 113 return key; 114 } 115 116 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) { 117 jlong byte_offset = field_offset_to_byte_offset(field_offset); 118 // Don't allow unsafe to be used to read or write the header word of oops 119 assert(p == NULL || field_offset >= oopDesc::header_size(), "offset must be outside of header"); 120 #ifdef ASSERT 121 if (p != NULL) { 122 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset"); 123 if (byte_offset == (jint)byte_offset) { 124 void* ptr_plus_disp = (address)p + byte_offset; 125 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp, 126 "raw [ptr+disp] must be consistent with oop::field_base"); 127 } 128 jlong p_size = HeapWordSize * (jlong)(p->size()); 129 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size)); 130 } 131 #endif 132 if (sizeof(char*) == sizeof(jint)) // (this constant folds!) 133 return (address)p + (jint) byte_offset; 134 else 135 return (address)p + byte_offset; 136 } 137 138 // Externally callable versions: 139 // (Use these in compiler intrinsics which emulate unsafe primitives.) 140 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) { 141 return field_offset; 142 } 143 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) { 144 return byte_offset; 145 } 146 jint Unsafe_invocation_key_from_method_slot(jint slot) { 147 return invocation_key_from_method_slot(slot); 148 } 149 jint Unsafe_invocation_key_to_method_slot(jint key) { 150 return invocation_key_to_method_slot(key); 151 } 152 153 154 ///// Data in the Java heap. 155 156 #define GET_FIELD(obj, offset, type_name, v) \ 157 oop p = JNIHandles::resolve(obj); \ 158 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset) 159 160 #define SET_FIELD(obj, offset, type_name, x) \ 161 oop p = JNIHandles::resolve(obj); \ 162 *(type_name*)index_oop_from_field_offset_long(p, offset) = x 163 164 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \ 165 oop p = JNIHandles::resolve(obj); \ 166 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset)); 167 168 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \ 169 oop p = JNIHandles::resolve(obj); \ 170 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x); 171 172 // Macros for oops that check UseCompressedOops 173 174 #define GET_OOP_FIELD(obj, offset, v) \ 175 oop p = JNIHandles::resolve(obj); \ 176 oop v; \ 177 if (UseCompressedOops) { \ 178 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \ 179 v = oopDesc::decode_heap_oop(n); \ 180 } else { \ 181 v = *(oop*)index_oop_from_field_offset_long(p, offset); \ 182 } 183 184 185 // Get/SetObject must be special-cased, since it works with handles. 186 187 // The xxx140 variants for backward compatibility do not allow a full-width offset. 188 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) 189 UnsafeWrapper("Unsafe_GetObject"); 190 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); 191 GET_OOP_FIELD(obj, offset, v) 192 jobject ret = JNIHandles::make_local(env, v); 193 #if INCLUDE_ALL_GCS 194 // We could be accessing the referent field in a reference 195 // object. If G1 is enabled then we need to register a non-null 196 // referent with the SATB barrier. 197 if (UseG1GC) { 198 bool needs_barrier = false; 199 200 if (ret != NULL) { 201 if (offset == java_lang_ref_Reference::referent_offset) { 202 oop o = JNIHandles::resolve_non_null(obj); 203 Klass* k = o->klass(); 204 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) { 205 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity"); 206 needs_barrier = true; 207 } 208 } 209 } 210 211 if (needs_barrier) { 212 oop referent = JNIHandles::resolve(ret); 213 G1SATBCardTableModRefBS::enqueue(referent); 214 } 215 } 216 #endif // INCLUDE_ALL_GCS 217 return ret; 218 UNSAFE_END 219 220 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h)) 221 UnsafeWrapper("Unsafe_SetObject"); 222 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); 223 oop x = JNIHandles::resolve(x_h); 224 //SET_FIELD(obj, offset, oop, x); 225 oop p = JNIHandles::resolve(obj); 226 if (UseCompressedOops) { 227 if (x != NULL) { 228 // If there is a heap base pointer, we are obliged to emit a store barrier. 229 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 230 } else { 231 narrowOop n = oopDesc::encode_heap_oop_not_null(x); 232 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n; 233 } 234 } else { 235 if (x != NULL) { 236 // If there is a heap base pointer, we are obliged to emit a store barrier. 237 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 238 } else { 239 *(oop*)index_oop_from_field_offset_long(p, offset) = x; 240 } 241 } 242 UNSAFE_END 243 244 // The normal variants allow a null base pointer with an arbitrary address. 245 // But if the base pointer is non-null, the offset should make some sense. 246 // That is, it should be in the range [0, MAX_OBJECT_SIZE]. 247 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 248 UnsafeWrapper("Unsafe_GetObject"); 249 GET_OOP_FIELD(obj, offset, v) 250 jobject ret = JNIHandles::make_local(env, v); 251 #if INCLUDE_ALL_GCS 252 // We could be accessing the referent field in a reference 253 // object. If G1 is enabled then we need to register non-null 254 // referent with the SATB barrier. 255 if (UseG1GC) { 256 bool needs_barrier = false; 257 258 if (ret != NULL) { 259 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) { 260 oop o = JNIHandles::resolve(obj); 261 Klass* k = o->klass(); 262 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) { 263 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity"); 264 needs_barrier = true; 265 } 266 } 267 } 268 269 if (needs_barrier) { 270 oop referent = JNIHandles::resolve(ret); 271 G1SATBCardTableModRefBS::enqueue(referent); 272 } 273 } 274 #endif // INCLUDE_ALL_GCS 275 return ret; 276 UNSAFE_END 277 278 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 279 UnsafeWrapper("Unsafe_SetObject"); 280 oop x = JNIHandles::resolve(x_h); 281 oop p = JNIHandles::resolve(obj); 282 if (UseCompressedOops) { 283 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 284 } else { 285 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 286 } 287 UNSAFE_END 288 289 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 290 UnsafeWrapper("Unsafe_GetObjectVolatile"); 291 oop p = JNIHandles::resolve(obj); 292 void* addr = index_oop_from_field_offset_long(p, offset); 293 volatile oop v; 294 if (UseCompressedOops) { 295 volatile narrowOop n = *(volatile narrowOop*) addr; 296 v = oopDesc::decode_heap_oop(n); 297 } else { 298 v = *(volatile oop*) addr; 299 } 300 OrderAccess::acquire(); 301 return JNIHandles::make_local(env, v); 302 UNSAFE_END 303 304 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 305 UnsafeWrapper("Unsafe_SetObjectVolatile"); 306 oop x = JNIHandles::resolve(x_h); 307 oop p = JNIHandles::resolve(obj); 308 void* addr = index_oop_from_field_offset_long(p, offset); 309 OrderAccess::release(); 310 if (UseCompressedOops) { 311 oop_store((narrowOop*)addr, x); 312 } else { 313 oop_store((oop*)addr, x); 314 } 315 OrderAccess::fence(); 316 UNSAFE_END 317 318 #if defined(SPARC) || defined(X86) 319 // Sparc and X86 have atomic jlong (8 bytes) instructions 320 321 #else 322 // Keep old code for platforms which may not have atomic jlong (8 bytes) instructions 323 324 // Volatile long versions must use locks if !VM_Version::supports_cx8(). 325 // support_cx8 is a surrogate for 'supports atomic long memory ops'. 326 327 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 328 UnsafeWrapper("Unsafe_GetLongVolatile"); 329 { 330 if (VM_Version::supports_cx8()) { 331 GET_FIELD_VOLATILE(obj, offset, jlong, v); 332 return v; 333 } 334 else { 335 Handle p (THREAD, JNIHandles::resolve(obj)); 336 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 337 ObjectLocker ol(p, THREAD); 338 jlong value = *addr; 339 return value; 340 } 341 } 342 UNSAFE_END 343 344 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) 345 UnsafeWrapper("Unsafe_SetLongVolatile"); 346 { 347 if (VM_Version::supports_cx8()) { 348 SET_FIELD_VOLATILE(obj, offset, jlong, x); 349 } 350 else { 351 Handle p (THREAD, JNIHandles::resolve(obj)); 352 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 353 ObjectLocker ol(p, THREAD); 354 *addr = x; 355 } 356 } 357 UNSAFE_END 358 359 #endif // not SPARC and not X86 360 361 #define DEFINE_GETSETOOP(jboolean, Boolean) \ 362 \ 363 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \ 364 UnsafeWrapper("Unsafe_Get"#Boolean); \ 365 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \ 366 GET_FIELD(obj, offset, jboolean, v); \ 367 return v; \ 368 UNSAFE_END \ 369 \ 370 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \ 371 UnsafeWrapper("Unsafe_Set"#Boolean); \ 372 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \ 373 SET_FIELD(obj, offset, jboolean, x); \ 374 UNSAFE_END \ 375 \ 376 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \ 377 UnsafeWrapper("Unsafe_Get"#Boolean); \ 378 GET_FIELD(obj, offset, jboolean, v); \ 379 return v; \ 380 UNSAFE_END \ 381 \ 382 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \ 383 UnsafeWrapper("Unsafe_Set"#Boolean); \ 384 SET_FIELD(obj, offset, jboolean, x); \ 385 UNSAFE_END \ 386 \ 387 // END DEFINE_GETSETOOP. 388 389 DEFINE_GETSETOOP(jboolean, Boolean) 390 DEFINE_GETSETOOP(jbyte, Byte) 391 DEFINE_GETSETOOP(jshort, Short); 392 DEFINE_GETSETOOP(jchar, Char); 393 DEFINE_GETSETOOP(jint, Int); 394 DEFINE_GETSETOOP(jlong, Long); 395 DEFINE_GETSETOOP(jfloat, Float); 396 DEFINE_GETSETOOP(jdouble, Double); 397 398 #undef DEFINE_GETSETOOP 399 400 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \ 401 \ 402 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \ 403 UnsafeWrapper("Unsafe_Get"#Boolean); \ 404 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \ 405 return v; \ 406 UNSAFE_END \ 407 \ 408 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \ 409 UnsafeWrapper("Unsafe_Set"#Boolean); \ 410 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \ 411 UNSAFE_END \ 412 \ 413 // END DEFINE_GETSETOOP_VOLATILE. 414 415 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) 416 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte) 417 DEFINE_GETSETOOP_VOLATILE(jshort, Short); 418 DEFINE_GETSETOOP_VOLATILE(jchar, Char); 419 DEFINE_GETSETOOP_VOLATILE(jint, Int); 420 DEFINE_GETSETOOP_VOLATILE(jfloat, Float); 421 DEFINE_GETSETOOP_VOLATILE(jdouble, Double); 422 423 #if defined(SPARC) || defined(X86) 424 // Sparc and X86 have atomic jlong (8 bytes) instructions 425 DEFINE_GETSETOOP_VOLATILE(jlong, Long); 426 #endif 427 428 #undef DEFINE_GETSETOOP_VOLATILE 429 430 // The non-intrinsified versions of setOrdered just use setVolatile 431 432 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x)) 433 UnsafeWrapper("Unsafe_SetOrderedInt"); 434 SET_FIELD_VOLATILE(obj, offset, jint, x); 435 UNSAFE_END 436 437 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 438 UnsafeWrapper("Unsafe_SetOrderedObject"); 439 oop x = JNIHandles::resolve(x_h); 440 oop p = JNIHandles::resolve(obj); 441 void* addr = index_oop_from_field_offset_long(p, offset); 442 OrderAccess::release(); 443 if (UseCompressedOops) { 444 oop_store((narrowOop*)addr, x); 445 } else { 446 oop_store((oop*)addr, x); 447 } 448 OrderAccess::fence(); 449 UNSAFE_END 450 451 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) 452 UnsafeWrapper("Unsafe_SetOrderedLong"); 453 #if defined(SPARC) || defined(X86) 454 // Sparc and X86 have atomic jlong (8 bytes) instructions 455 SET_FIELD_VOLATILE(obj, offset, jlong, x); 456 #else 457 // Keep old code for platforms which may not have atomic long (8 bytes) instructions 458 { 459 if (VM_Version::supports_cx8()) { 460 SET_FIELD_VOLATILE(obj, offset, jlong, x); 461 } 462 else { 463 Handle p (THREAD, JNIHandles::resolve(obj)); 464 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 465 ObjectLocker ol(p, THREAD); 466 *addr = x; 467 } 468 } 469 #endif 470 UNSAFE_END 471 472 UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe)) 473 UnsafeWrapper("Unsafe_LoadFence"); 474 OrderAccess::acquire(); 475 UNSAFE_END 476 477 UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe)) 478 UnsafeWrapper("Unsafe_StoreFence"); 479 OrderAccess::release(); 480 UNSAFE_END 481 482 UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe)) 483 UnsafeWrapper("Unsafe_FullFence"); 484 OrderAccess::fence(); 485 UNSAFE_END 486 487 ////// Data in the C heap. 488 489 // Note: These do not throw NullPointerException for bad pointers. 490 // They just crash. Only a oop base pointer can generate a NullPointerException. 491 // 492 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \ 493 \ 494 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \ 495 UnsafeWrapper("Unsafe_GetNative"#Type); \ 496 void* p = addr_from_java(addr); \ 497 JavaThread* t = JavaThread::current(); \ 498 t->set_doing_unsafe_access(true); \ 499 java_type x = *(volatile native_type*)p; \ 500 t->set_doing_unsafe_access(false); \ 501 return x; \ 502 UNSAFE_END \ 503 \ 504 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \ 505 UnsafeWrapper("Unsafe_SetNative"#Type); \ 506 JavaThread* t = JavaThread::current(); \ 507 t->set_doing_unsafe_access(true); \ 508 void* p = addr_from_java(addr); \ 509 *(volatile native_type*)p = x; \ 510 t->set_doing_unsafe_access(false); \ 511 UNSAFE_END \ 512 \ 513 // END DEFINE_GETSETNATIVE. 514 515 DEFINE_GETSETNATIVE(jbyte, Byte, signed char) 516 DEFINE_GETSETNATIVE(jshort, Short, signed short); 517 DEFINE_GETSETNATIVE(jchar, Char, unsigned short); 518 DEFINE_GETSETNATIVE(jint, Int, jint); 519 // no long -- handled specially 520 DEFINE_GETSETNATIVE(jfloat, Float, float); 521 DEFINE_GETSETNATIVE(jdouble, Double, double); 522 523 #undef DEFINE_GETSETNATIVE 524 525 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr)) 526 UnsafeWrapper("Unsafe_GetNativeLong"); 527 JavaThread* t = JavaThread::current(); 528 // We do it this way to avoid problems with access to heap using 64 529 // bit loads, as jlong in heap could be not 64-bit aligned, and on 530 // some CPUs (SPARC) it leads to SIGBUS. 531 t->set_doing_unsafe_access(true); 532 void* p = addr_from_java(addr); 533 jlong x; 534 if (((intptr_t)p & 7) == 0) { 535 // jlong is aligned, do a volatile access 536 x = *(volatile jlong*)p; 537 } else { 538 jlong_accessor acc; 539 acc.words[0] = ((volatile jint*)p)[0]; 540 acc.words[1] = ((volatile jint*)p)[1]; 541 x = acc.long_value; 542 } 543 t->set_doing_unsafe_access(false); 544 return x; 545 UNSAFE_END 546 547 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 548 UnsafeWrapper("Unsafe_SetNativeLong"); 549 JavaThread* t = JavaThread::current(); 550 // see comment for Unsafe_GetNativeLong 551 t->set_doing_unsafe_access(true); 552 void* p = addr_from_java(addr); 553 if (((intptr_t)p & 7) == 0) { 554 // jlong is aligned, do a volatile access 555 *(volatile jlong*)p = x; 556 } else { 557 jlong_accessor acc; 558 acc.long_value = x; 559 ((volatile jint*)p)[0] = acc.words[0]; 560 ((volatile jint*)p)[1] = acc.words[1]; 561 } 562 t->set_doing_unsafe_access(false); 563 UNSAFE_END 564 565 566 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr)) 567 UnsafeWrapper("Unsafe_GetNativeAddress"); 568 void* p = addr_from_java(addr); 569 return addr_to_java(*(void**)p); 570 UNSAFE_END 571 572 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 573 UnsafeWrapper("Unsafe_SetNativeAddress"); 574 void* p = addr_from_java(addr); 575 *(void**)p = addr_from_java(x); 576 UNSAFE_END 577 578 579 ////// Allocation requests 580 581 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls)) 582 UnsafeWrapper("Unsafe_AllocateInstance"); 583 { 584 ThreadToNativeFromVM ttnfv(thread); 585 return env->AllocObject(cls); 586 } 587 UNSAFE_END 588 589 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size)) 590 UnsafeWrapper("Unsafe_AllocateMemory"); 591 size_t sz = (size_t)size; 592 if (sz != (julong)size || size < 0) { 593 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 594 } 595 if (sz == 0) { 596 return 0; 597 } 598 sz = round_to(sz, HeapWordSize); 599 void* x = os::malloc(sz, mtInternal); 600 if (x == NULL) { 601 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 602 } 603 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize); 604 return addr_to_java(x); 605 UNSAFE_END 606 607 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size)) 608 UnsafeWrapper("Unsafe_ReallocateMemory"); 609 void* p = addr_from_java(addr); 610 size_t sz = (size_t)size; 611 if (sz != (julong)size || size < 0) { 612 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 613 } 614 if (sz == 0) { 615 os::free(p); 616 return 0; 617 } 618 sz = round_to(sz, HeapWordSize); 619 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal); 620 if (x == NULL) { 621 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 622 } 623 return addr_to_java(x); 624 UNSAFE_END 625 626 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr)) 627 UnsafeWrapper("Unsafe_FreeMemory"); 628 void* p = addr_from_java(addr); 629 if (p == NULL) { 630 return; 631 } 632 os::free(p); 633 UNSAFE_END 634 635 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value)) 636 UnsafeWrapper("Unsafe_SetMemory"); 637 size_t sz = (size_t)size; 638 if (sz != (julong)size || size < 0) { 639 THROW(vmSymbols::java_lang_IllegalArgumentException()); 640 } 641 char* p = (char*) addr_from_java(addr); 642 Copy::fill_to_memory_atomic(p, sz, value); 643 UNSAFE_END 644 645 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value)) 646 UnsafeWrapper("Unsafe_SetMemory"); 647 size_t sz = (size_t)size; 648 if (sz != (julong)size || size < 0) { 649 THROW(vmSymbols::java_lang_IllegalArgumentException()); 650 } 651 oop base = JNIHandles::resolve(obj); 652 void* p = index_oop_from_field_offset_long(base, offset); 653 Copy::fill_to_memory_atomic(p, sz, value); 654 UNSAFE_END 655 656 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size)) 657 UnsafeWrapper("Unsafe_CopyMemory"); 658 if (size == 0) { 659 return; 660 } 661 size_t sz = (size_t)size; 662 if (sz != (julong)size || size < 0) { 663 THROW(vmSymbols::java_lang_IllegalArgumentException()); 664 } 665 void* src = addr_from_java(srcAddr); 666 void* dst = addr_from_java(dstAddr); 667 Copy::conjoint_memory_atomic(src, dst, sz); 668 UNSAFE_END 669 670 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size)) 671 UnsafeWrapper("Unsafe_CopyMemory"); 672 if (size == 0) { 673 return; 674 } 675 size_t sz = (size_t)size; 676 if (sz != (julong)size || size < 0) { 677 THROW(vmSymbols::java_lang_IllegalArgumentException()); 678 } 679 oop srcp = JNIHandles::resolve(srcObj); 680 oop dstp = JNIHandles::resolve(dstObj); 681 if (dstp != NULL && !dstp->is_typeArray()) { 682 // NYI: This works only for non-oop arrays at present. 683 // Generalizing it would be reasonable, but requires card marking. 684 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad. 685 THROW(vmSymbols::java_lang_IllegalArgumentException()); 686 } 687 void* src = index_oop_from_field_offset_long(srcp, srcOffset); 688 void* dst = index_oop_from_field_offset_long(dstp, dstOffset); 689 Copy::conjoint_memory_atomic(src, dst, sz); 690 UNSAFE_END 691 692 693 ////// Random queries 694 695 // See comment at file start about UNSAFE_LEAF 696 //UNSAFE_LEAF(jint, Unsafe_AddressSize()) 697 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe)) 698 UnsafeWrapper("Unsafe_AddressSize"); 699 return sizeof(void*); 700 UNSAFE_END 701 702 // See comment at file start about UNSAFE_LEAF 703 //UNSAFE_LEAF(jint, Unsafe_PageSize()) 704 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe)) 705 UnsafeWrapper("Unsafe_PageSize"); 706 return os::vm_page_size(); 707 UNSAFE_END 708 709 jint find_field_offset(jobject field, int must_be_static, TRAPS) { 710 if (field == NULL) { 711 THROW_0(vmSymbols::java_lang_NullPointerException()); 712 } 713 714 oop reflected = JNIHandles::resolve_non_null(field); 715 oop mirror = java_lang_reflect_Field::clazz(reflected); 716 Klass* k = java_lang_Class::as_Klass(mirror); 717 int slot = java_lang_reflect_Field::slot(reflected); 718 int modifiers = java_lang_reflect_Field::modifiers(reflected); 719 720 if (must_be_static >= 0) { 721 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0); 722 if (must_be_static != really_is_static) { 723 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 724 } 725 } 726 727 int offset = InstanceKlass::cast(k)->field_offset(slot); 728 return field_offset_from_byte_offset(offset); 729 } 730 731 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 732 UnsafeWrapper("Unsafe_ObjectFieldOffset"); 733 return find_field_offset(field, 0, THREAD); 734 UNSAFE_END 735 736 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 737 UnsafeWrapper("Unsafe_StaticFieldOffset"); 738 return find_field_offset(field, 1, THREAD); 739 UNSAFE_END 740 741 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field)) 742 UnsafeWrapper("Unsafe_StaticFieldBase"); 743 // Note: In this VM implementation, a field address is always a short 744 // offset from the base of a a klass metaobject. Thus, the full dynamic 745 // range of the return type is never used. However, some implementations 746 // might put the static field inside an array shared by many classes, 747 // or even at a fixed address, in which case the address could be quite 748 // large. In that last case, this function would return NULL, since 749 // the address would operate alone, without any base pointer. 750 751 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); 752 753 oop reflected = JNIHandles::resolve_non_null(field); 754 oop mirror = java_lang_reflect_Field::clazz(reflected); 755 int modifiers = java_lang_reflect_Field::modifiers(reflected); 756 757 if ((modifiers & JVM_ACC_STATIC) == 0) { 758 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 759 } 760 761 return JNIHandles::make_local(env, mirror); 762 UNSAFE_END 763 764 //@deprecated 765 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 766 UnsafeWrapper("Unsafe_FieldOffset"); 767 // tries (but fails) to be polymorphic between static and non-static: 768 jlong offset = find_field_offset(field, -1, THREAD); 769 guarantee(offset == (jint)offset, "offset fits in 32 bits"); 770 return (jint)offset; 771 UNSAFE_END 772 773 //@deprecated 774 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz)) 775 UnsafeWrapper("Unsafe_StaticFieldBase"); 776 if (clazz == NULL) { 777 THROW_0(vmSymbols::java_lang_NullPointerException()); 778 } 779 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz)); 780 UNSAFE_END 781 782 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) { 783 UnsafeWrapper("Unsafe_EnsureClassInitialized"); 784 if (clazz == NULL) { 785 THROW(vmSymbols::java_lang_NullPointerException()); 786 } 787 oop mirror = JNIHandles::resolve_non_null(clazz); 788 789 Klass* klass = java_lang_Class::as_Klass(mirror); 790 if (klass != NULL && klass->should_be_initialized()) { 791 InstanceKlass* k = InstanceKlass::cast(klass); 792 k->initialize(CHECK); 793 } 794 } 795 UNSAFE_END 796 797 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) { 798 UnsafeWrapper("Unsafe_ShouldBeInitialized"); 799 if (clazz == NULL) { 800 THROW_(vmSymbols::java_lang_NullPointerException(), false); 801 } 802 oop mirror = JNIHandles::resolve_non_null(clazz); 803 Klass* klass = java_lang_Class::as_Klass(mirror); 804 if (klass != NULL && klass->should_be_initialized()) { 805 return true; 806 } 807 return false; 808 } 809 UNSAFE_END 810 811 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) { 812 if (acls == NULL) { 813 THROW(vmSymbols::java_lang_NullPointerException()); 814 } 815 oop mirror = JNIHandles::resolve_non_null(acls); 816 Klass* k = java_lang_Class::as_Klass(mirror); 817 if (k == NULL || !k->oop_is_array()) { 818 THROW(vmSymbols::java_lang_InvalidClassException()); 819 } else if (k->oop_is_objArray()) { 820 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT); 821 scale = heapOopSize; 822 } else if (k->oop_is_typeArray()) { 823 TypeArrayKlass* tak = TypeArrayKlass::cast(k); 824 base = tak->array_header_in_bytes(); 825 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok"); 826 scale = (1 << tak->log2_element_size()); 827 } else { 828 ShouldNotReachHere(); 829 } 830 } 831 832 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls)) 833 UnsafeWrapper("Unsafe_ArrayBaseOffset"); 834 int base, scale; 835 getBaseAndScale(base, scale, acls, CHECK_0); 836 return field_offset_from_byte_offset(base); 837 UNSAFE_END 838 839 840 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls)) 841 UnsafeWrapper("Unsafe_ArrayIndexScale"); 842 int base, scale; 843 getBaseAndScale(base, scale, acls, CHECK_0); 844 // This VM packs both fields and array elements down to the byte. 845 // But watch out: If this changes, so that array references for 846 // a given primitive type (say, T_BOOLEAN) use different memory units 847 // than fields, this method MUST return zero for such arrays. 848 // For example, the VM used to store sub-word sized fields in full 849 // words in the object layout, so that accessors like getByte(Object,int) 850 // did not really do what one might expect for arrays. Therefore, 851 // this function used to report a zero scale factor, so that the user 852 // would know not to attempt to access sub-word array elements. 853 // // Code for unpacked fields: 854 // if (scale < wordSize) return 0; 855 856 // The following allows for a pretty general fieldOffset cookie scheme, 857 // but requires it to be linear in byte offset. 858 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0); 859 UNSAFE_END 860 861 862 static inline void throw_new(JNIEnv *env, const char *ename) { 863 char buf[100]; 864 strcpy(buf, "java/lang/"); 865 strcat(buf, ename); 866 jclass cls = env->FindClass(buf); 867 char* msg = NULL; 868 env->ThrowNew(cls, msg); 869 } 870 871 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) { 872 { 873 // Code lifted from JDK 1.3 ClassLoader.c 874 875 jbyte *body; 876 char *utfName; 877 jclass result = 0; 878 char buf[128]; 879 880 if (UsePerfData) { 881 ClassLoader::unsafe_defineClassCallCounter()->inc(); 882 } 883 884 if (data == NULL) { 885 throw_new(env, "NullPointerException"); 886 return 0; 887 } 888 889 /* Work around 4153825. malloc crashes on Solaris when passed a 890 * negative size. 891 */ 892 if (length < 0) { 893 throw_new(env, "ArrayIndexOutOfBoundsException"); 894 return 0; 895 } 896 897 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal); 898 899 if (body == 0) { 900 throw_new(env, "OutOfMemoryError"); 901 return 0; 902 } 903 904 env->GetByteArrayRegion(data, offset, length, body); 905 906 if (env->ExceptionOccurred()) 907 goto free_body; 908 909 if (name != NULL) { 910 uint len = env->GetStringUTFLength(name); 911 int unicode_len = env->GetStringLength(name); 912 if (len >= sizeof(buf)) { 913 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 914 if (utfName == NULL) { 915 throw_new(env, "OutOfMemoryError"); 916 goto free_body; 917 } 918 } else { 919 utfName = buf; 920 } 921 env->GetStringUTFRegion(name, 0, unicode_len, utfName); 922 //VerifyFixClassname(utfName); 923 for (uint i = 0; i < len; i++) { 924 if (utfName[i] == '.') utfName[i] = '/'; 925 } 926 } else { 927 utfName = NULL; 928 } 929 930 result = JVM_DefineClass(env, utfName, loader, body, length, pd); 931 932 if (utfName && utfName != buf) 933 FREE_C_HEAP_ARRAY(char, utfName, mtInternal); 934 935 free_body: 936 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal); 937 return result; 938 } 939 } 940 941 942 UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd)) 943 UnsafeWrapper("Unsafe_DefineClass"); 944 { 945 ThreadToNativeFromVM ttnfv(thread); 946 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd); 947 } 948 UNSAFE_END 949 950 951 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length)) 952 UnsafeWrapper("Unsafe_DefineClass"); 953 { 954 ThreadToNativeFromVM ttnfv(thread); 955 956 int depthFromDefineClass0 = 1; 957 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0); 958 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller); 959 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller); 960 961 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd); 962 } 963 UNSAFE_END 964 965 966 #define DAC_Args CLS"[B["OBJ 967 // define a class but do not make it known to the class loader or system dictionary 968 // - host_class: supplies context for linkage, access control, protection domain, and class loader 969 // - data: bytes of a class file, a raw memory address (length gives the number of bytes) 970 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data 971 972 // When you load an anonymous class U, it works as if you changed its name just before loading, 973 // to a name that you will never use again. Since the name is lost, no other class can directly 974 // link to any member of U. Just after U is loaded, the only way to use it is reflectively, 975 // through java.lang.Class methods like Class.newInstance. 976 977 // Access checks for linkage sites within U continue to follow the same rules as for named classes. 978 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded. 979 // An anonymous class also has special privileges to access any member of its host class. 980 // This is the main reason why this loading operation is unsafe. The purpose of this is to 981 // allow language implementations to simulate "open classes"; a host class in effect gets 982 // new code when an anonymous class is loaded alongside it. A less convenient but more 983 // standard way to do this is with reflection, which can also be set to ignore access 984 // restrictions. 985 986 // Access into an anonymous class is possible only through reflection. Therefore, there 987 // are no special access rules for calling into an anonymous class. The relaxed access 988 // rule for the host class is applied in the opposite direction: A host class reflectively 989 // access one of its anonymous classes. 990 991 // If you load the same bytecodes twice, you get two different classes. You can reload 992 // the same bytecodes with or without varying CP patches. 993 994 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1. 995 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is). 996 // The CONSTANT_Class entry for that name can be patched to refer directly to U1. 997 998 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as 999 // an outer class (so that U2 is an anonymous inner class of anonymous U1). 1000 // It is not possible for a named class, or an older anonymous class, to refer by 1001 // name (via its CP) to a newer anonymous class. 1002 1003 // CP patching may also be used to modify (i.e., hack) the names of methods, classes, 1004 // or type descriptors used in the loaded anonymous class. 1005 1006 // Finally, CP patching may be used to introduce "live" objects into the constant pool, 1007 // instead of "dead" strings. A compiled statement like println((Object)"hello") can 1008 // be changed to println(greeting), where greeting is an arbitrary object created before 1009 // the anonymous class is loaded. This is useful in dynamic languages, in which 1010 // various kinds of metaobjects must be introduced as constants into bytecode. 1011 // Note the cast (Object), which tells the verifier to expect an arbitrary object, 1012 // not just a literal string. For such ldc instructions, the verifier uses the 1013 // type Object instead of String, if the loaded constant is not in fact a String. 1014 1015 static instanceKlassHandle 1016 Unsafe_DefineAnonymousClass_impl(JNIEnv *env, 1017 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh, 1018 HeapWord* *temp_alloc, 1019 TRAPS) { 1020 1021 if (UsePerfData) { 1022 ClassLoader::unsafe_defineClassCallCounter()->inc(); 1023 } 1024 1025 if (data == NULL) { 1026 THROW_0(vmSymbols::java_lang_NullPointerException()); 1027 } 1028 1029 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length(); 1030 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord); 1031 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal); 1032 if (body == NULL) { 1033 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 1034 } 1035 1036 // caller responsible to free it: 1037 (*temp_alloc) = body; 1038 1039 { 1040 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0); 1041 Copy::conjoint_words((HeapWord*) array_base, body, word_length); 1042 } 1043 1044 u1* class_bytes = (u1*) body; 1045 int class_bytes_length = (int) length; 1046 if (class_bytes_length < 0) class_bytes_length = 0; 1047 if (class_bytes == NULL 1048 || host_class == NULL 1049 || length != class_bytes_length) 1050 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 1051 1052 objArrayHandle cp_patches_h; 1053 if (cp_patches_jh != NULL) { 1054 oop p = JNIHandles::resolve_non_null(cp_patches_jh); 1055 if (!p->is_objArray()) 1056 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 1057 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p); 1058 } 1059 1060 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class))); 1061 const char* host_source = host_klass->external_name(); 1062 Handle host_loader(THREAD, host_klass->class_loader()); 1063 Handle host_domain(THREAD, host_klass->protection_domain()); 1064 1065 GrowableArray<Handle>* cp_patches = NULL; 1066 if (cp_patches_h.not_null()) { 1067 int alen = cp_patches_h->length(); 1068 for (int i = alen-1; i >= 0; i--) { 1069 oop p = cp_patches_h->obj_at(i); 1070 if (p != NULL) { 1071 Handle patch(THREAD, p); 1072 if (cp_patches == NULL) 1073 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle()); 1074 cp_patches->at_put(i, patch); 1075 } 1076 } 1077 } 1078 1079 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source); 1080 1081 instanceKlassHandle anon_klass; 1082 { 1083 Symbol* no_class_name = NULL; 1084 Klass* anonk = SystemDictionary::parse_stream(no_class_name, 1085 host_loader, host_domain, 1086 &st, host_klass, cp_patches, 1087 CHECK_NULL); 1088 if (anonk == NULL) return NULL; 1089 anon_klass = instanceKlassHandle(THREAD, anonk); 1090 } 1091 1092 return anon_klass; 1093 } 1094 1095 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh)) 1096 { 1097 instanceKlassHandle anon_klass; 1098 jobject res_jh = NULL; 1099 1100 UnsafeWrapper("Unsafe_DefineAnonymousClass"); 1101 ResourceMark rm(THREAD); 1102 1103 HeapWord* temp_alloc = NULL; 1104 1105 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data, 1106 cp_patches_jh, 1107 &temp_alloc, THREAD); 1108 if (anon_klass() != NULL) 1109 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror()); 1110 1111 // try/finally clause: 1112 if (temp_alloc != NULL) { 1113 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal); 1114 } 1115 1116 // The anonymous class loader data has been artificially been kept alive to 1117 // this point. The mirror and any instances of this class have to keep 1118 // it alive afterwards. 1119 if (anon_klass() != NULL) { 1120 anon_klass->class_loader_data()->set_keep_alive(false); 1121 } 1122 1123 // let caller initialize it as needed... 1124 1125 return (jclass) res_jh; 1126 } 1127 UNSAFE_END 1128 1129 1130 1131 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 1132 UnsafeWrapper("Unsafe_MonitorEnter"); 1133 { 1134 if (jobj == NULL) { 1135 THROW(vmSymbols::java_lang_NullPointerException()); 1136 } 1137 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 1138 ObjectSynchronizer::jni_enter(obj, CHECK); 1139 } 1140 UNSAFE_END 1141 1142 1143 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 1144 UnsafeWrapper("Unsafe_TryMonitorEnter"); 1145 { 1146 if (jobj == NULL) { 1147 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 1148 } 1149 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 1150 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0); 1151 return (res ? JNI_TRUE : JNI_FALSE); 1152 } 1153 UNSAFE_END 1154 1155 1156 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj)) 1157 UnsafeWrapper("Unsafe_MonitorExit"); 1158 { 1159 if (jobj == NULL) { 1160 THROW(vmSymbols::java_lang_NullPointerException()); 1161 } 1162 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj)); 1163 ObjectSynchronizer::jni_exit(obj(), CHECK); 1164 } 1165 UNSAFE_END 1166 1167 1168 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr)) 1169 UnsafeWrapper("Unsafe_ThrowException"); 1170 { 1171 ThreadToNativeFromVM ttnfv(thread); 1172 env->Throw(thr); 1173 } 1174 UNSAFE_END 1175 1176 // JSR166 ------------------------------------------------------------------ 1177 1178 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h)) 1179 UnsafeWrapper("Unsafe_CompareAndSwapObject"); 1180 oop x = JNIHandles::resolve(x_h); 1181 oop e = JNIHandles::resolve(e_h); 1182 oop p = JNIHandles::resolve(obj); 1183 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset); 1184 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true); 1185 jboolean success = (res == e); 1186 if (success) 1187 update_barrier_set((void*)addr, x); 1188 return success; 1189 UNSAFE_END 1190 1191 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x)) 1192 UnsafeWrapper("Unsafe_CompareAndSwapInt"); 1193 oop p = JNIHandles::resolve(obj); 1194 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset); 1195 return (jint)(Atomic::cmpxchg(x, addr, e)) == e; 1196 UNSAFE_END 1197 1198 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x)) 1199 UnsafeWrapper("Unsafe_CompareAndSwapLong"); 1200 Handle p (THREAD, JNIHandles::resolve(obj)); 1201 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 1202 if (VM_Version::supports_cx8()) 1203 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e; 1204 else { 1205 jboolean success = false; 1206 ObjectLocker ol(p, THREAD); 1207 if (*addr == e) { *addr = x; success = true; } 1208 return success; 1209 } 1210 UNSAFE_END 1211 1212 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time)) 1213 UnsafeWrapper("Unsafe_Park"); 1214 #ifndef USDT2 1215 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time); 1216 #else /* USDT2 */ 1217 HOTSPOT_THREAD_PARK_BEGIN( 1218 (uintptr_t) thread->parker(), (int) isAbsolute, time); 1219 #endif /* USDT2 */ 1220 JavaThreadParkedState jtps(thread, time != 0); 1221 thread->parker()->park(isAbsolute != 0, time); 1222 #ifndef USDT2 1223 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker()); 1224 #else /* USDT2 */ 1225 HOTSPOT_THREAD_PARK_END( 1226 (uintptr_t) thread->parker()); 1227 #endif /* USDT2 */ 1228 UNSAFE_END 1229 1230 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread)) 1231 UnsafeWrapper("Unsafe_Unpark"); 1232 Parker* p = NULL; 1233 if (jthread != NULL) { 1234 oop java_thread = JNIHandles::resolve_non_null(jthread); 1235 if (java_thread != NULL) { 1236 jlong lp = java_lang_Thread::park_event(java_thread); 1237 if (lp != 0) { 1238 // This cast is OK even though the jlong might have been read 1239 // non-atomically on 32bit systems, since there, one word will 1240 // always be zero anyway and the value set is always the same 1241 p = (Parker*)addr_from_java(lp); 1242 } else { 1243 // Grab lock if apparently null or using older version of library 1244 MutexLocker mu(Threads_lock); 1245 java_thread = JNIHandles::resolve_non_null(jthread); 1246 if (java_thread != NULL) { 1247 JavaThread* thr = java_lang_Thread::thread(java_thread); 1248 if (thr != NULL) { 1249 p = thr->parker(); 1250 if (p != NULL) { // Bind to Java thread for next time. 1251 java_lang_Thread::set_park_event(java_thread, addr_to_java(p)); 1252 } 1253 } 1254 } 1255 } 1256 } 1257 } 1258 if (p != NULL) { 1259 #ifndef USDT2 1260 HS_DTRACE_PROBE1(hotspot, thread__unpark, p); 1261 #else /* USDT2 */ 1262 HOTSPOT_THREAD_UNPARK( 1263 (uintptr_t) p); 1264 #endif /* USDT2 */ 1265 p->unpark(); 1266 } 1267 UNSAFE_END 1268 1269 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem)) 1270 UnsafeWrapper("Unsafe_Loadavg"); 1271 const int max_nelem = 3; 1272 double la[max_nelem]; 1273 jint ret; 1274 1275 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg)); 1276 assert(a->is_typeArray(), "must be type array"); 1277 1278 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) { 1279 ThreadToNativeFromVM ttnfv(thread); 1280 throw_new(env, "ArrayIndexOutOfBoundsException"); 1281 return -1; 1282 } 1283 1284 ret = os::loadavg(la, nelem); 1285 if (ret == -1) return -1; 1286 1287 // if successful, ret is the number of samples actually retrieved. 1288 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value"); 1289 switch(ret) { 1290 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through 1291 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through 1292 case 1: a->double_at_put(0, (jdouble)la[0]); break; 1293 } 1294 return ret; 1295 UNSAFE_END 1296 1297 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 1298 UnsafeWrapper("Unsafe_PrefetchRead"); 1299 oop p = JNIHandles::resolve(obj); 1300 void* addr = index_oop_from_field_offset_long(p, 0); 1301 Prefetch::read(addr, (intx)offset); 1302 UNSAFE_END 1303 1304 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 1305 UnsafeWrapper("Unsafe_PrefetchWrite"); 1306 oop p = JNIHandles::resolve(obj); 1307 void* addr = index_oop_from_field_offset_long(p, 0); 1308 Prefetch::write(addr, (intx)offset); 1309 UNSAFE_END 1310 1311 1312 /// JVM_RegisterUnsafeMethods 1313 1314 #define ADR "J" 1315 1316 #define LANG "Ljava/lang/" 1317 1318 #define OBJ LANG"Object;" 1319 #define CLS LANG"Class;" 1320 #define CTR LANG"reflect/Constructor;" 1321 #define FLD LANG"reflect/Field;" 1322 #define MTH LANG"reflect/Method;" 1323 #define THR LANG"Throwable;" 1324 1325 #define DC0_Args LANG"String;[BII" 1326 #define DC_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;" 1327 1328 #define CC (char*) /*cast a literal from (const char*)*/ 1329 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1330 1331 // define deprecated accessors for compabitility with 1.4.0 1332 #define DECLARE_GETSETOOP_140(Boolean, Z) \ 1333 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \ 1334 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)} 1335 1336 // Note: In 1.4.1, getObject and kin take both int and long offsets. 1337 #define DECLARE_GETSETOOP_141(Boolean, Z) \ 1338 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1339 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)} 1340 1341 // Note: In 1.5.0, there are volatile versions too 1342 #define DECLARE_GETSETOOP(Boolean, Z) \ 1343 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1344 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \ 1345 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \ 1346 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)} 1347 1348 1349 #define DECLARE_GETSETNATIVE(Byte, B) \ 1350 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \ 1351 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)} 1352 1353 1354 1355 // These are the methods for 1.4.0 1356 static JNINativeMethod methods_140[] = { 1357 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)}, 1358 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)}, 1359 1360 DECLARE_GETSETOOP_140(Boolean, Z), 1361 DECLARE_GETSETOOP_140(Byte, B), 1362 DECLARE_GETSETOOP_140(Short, S), 1363 DECLARE_GETSETOOP_140(Char, C), 1364 DECLARE_GETSETOOP_140(Int, I), 1365 DECLARE_GETSETOOP_140(Long, J), 1366 DECLARE_GETSETOOP_140(Float, F), 1367 DECLARE_GETSETOOP_140(Double, D), 1368 1369 DECLARE_GETSETNATIVE(Byte, B), 1370 DECLARE_GETSETNATIVE(Short, S), 1371 DECLARE_GETSETNATIVE(Char, C), 1372 DECLARE_GETSETNATIVE(Int, I), 1373 DECLARE_GETSETNATIVE(Long, J), 1374 DECLARE_GETSETNATIVE(Float, F), 1375 DECLARE_GETSETNATIVE(Double, D), 1376 1377 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1378 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1379 1380 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1381 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1382 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1383 1384 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, 1385 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, 1386 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1387 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1388 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1389 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1390 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1391 1392 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1393 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1394 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1395 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1396 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1397 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)} 1398 }; 1399 1400 // These are the methods prior to the JSR 166 changes in 1.5.0 1401 static JNINativeMethod methods_141[] = { 1402 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1403 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1404 1405 DECLARE_GETSETOOP_141(Boolean, Z), 1406 DECLARE_GETSETOOP_141(Byte, B), 1407 DECLARE_GETSETOOP_141(Short, S), 1408 DECLARE_GETSETOOP_141(Char, C), 1409 DECLARE_GETSETOOP_141(Int, I), 1410 DECLARE_GETSETOOP_141(Long, J), 1411 DECLARE_GETSETOOP_141(Float, F), 1412 DECLARE_GETSETOOP_141(Double, D), 1413 1414 DECLARE_GETSETNATIVE(Byte, B), 1415 DECLARE_GETSETNATIVE(Short, S), 1416 DECLARE_GETSETNATIVE(Char, C), 1417 DECLARE_GETSETNATIVE(Int, I), 1418 DECLARE_GETSETNATIVE(Long, J), 1419 DECLARE_GETSETNATIVE(Float, F), 1420 DECLARE_GETSETNATIVE(Double, D), 1421 1422 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1423 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1424 1425 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1426 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1427 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1428 1429 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1430 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1431 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1432 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1433 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1434 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1435 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1436 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1437 1438 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1439 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1440 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1441 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1442 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1443 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)} 1444 1445 }; 1446 1447 // These are the methods prior to the JSR 166 changes in 1.6.0 1448 static JNINativeMethod methods_15[] = { 1449 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1450 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1451 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1452 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1453 1454 1455 DECLARE_GETSETOOP(Boolean, Z), 1456 DECLARE_GETSETOOP(Byte, B), 1457 DECLARE_GETSETOOP(Short, S), 1458 DECLARE_GETSETOOP(Char, C), 1459 DECLARE_GETSETOOP(Int, I), 1460 DECLARE_GETSETOOP(Long, J), 1461 DECLARE_GETSETOOP(Float, F), 1462 DECLARE_GETSETOOP(Double, D), 1463 1464 DECLARE_GETSETNATIVE(Byte, B), 1465 DECLARE_GETSETNATIVE(Short, S), 1466 DECLARE_GETSETNATIVE(Char, C), 1467 DECLARE_GETSETNATIVE(Int, I), 1468 DECLARE_GETSETNATIVE(Long, J), 1469 DECLARE_GETSETNATIVE(Float, F), 1470 DECLARE_GETSETNATIVE(Double, D), 1471 1472 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1473 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1474 1475 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1476 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1477 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1478 1479 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1480 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1481 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1482 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1483 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1484 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1485 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1486 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1487 1488 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1489 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1490 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1491 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1492 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1493 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1494 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1495 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1496 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1497 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1498 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1499 1500 }; 1501 1502 // These are the methods for 1.6.0 and 1.7.0 1503 static JNINativeMethod methods_16[] = { 1504 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1505 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1506 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1507 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1508 1509 DECLARE_GETSETOOP(Boolean, Z), 1510 DECLARE_GETSETOOP(Byte, B), 1511 DECLARE_GETSETOOP(Short, S), 1512 DECLARE_GETSETOOP(Char, C), 1513 DECLARE_GETSETOOP(Int, I), 1514 DECLARE_GETSETOOP(Long, J), 1515 DECLARE_GETSETOOP(Float, F), 1516 DECLARE_GETSETOOP(Double, D), 1517 1518 DECLARE_GETSETNATIVE(Byte, B), 1519 DECLARE_GETSETNATIVE(Short, S), 1520 DECLARE_GETSETNATIVE(Char, C), 1521 DECLARE_GETSETNATIVE(Int, I), 1522 DECLARE_GETSETNATIVE(Long, J), 1523 DECLARE_GETSETNATIVE(Float, F), 1524 DECLARE_GETSETNATIVE(Double, D), 1525 1526 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1527 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1528 1529 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1530 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1531 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1532 1533 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1534 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1535 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1536 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1537 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1538 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1539 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1540 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1541 1542 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1543 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1544 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1545 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1546 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1547 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)}, 1548 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1549 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1550 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1551 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1552 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)}, 1553 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)}, 1554 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)}, 1555 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1556 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1557 }; 1558 1559 // These are the methods for 1.8.0 1560 static JNINativeMethod methods_18[] = { 1561 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1562 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1563 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1564 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1565 1566 DECLARE_GETSETOOP(Boolean, Z), 1567 DECLARE_GETSETOOP(Byte, B), 1568 DECLARE_GETSETOOP(Short, S), 1569 DECLARE_GETSETOOP(Char, C), 1570 DECLARE_GETSETOOP(Int, I), 1571 DECLARE_GETSETOOP(Long, J), 1572 DECLARE_GETSETOOP(Float, F), 1573 DECLARE_GETSETOOP(Double, D), 1574 1575 DECLARE_GETSETNATIVE(Byte, B), 1576 DECLARE_GETSETNATIVE(Short, S), 1577 DECLARE_GETSETNATIVE(Char, C), 1578 DECLARE_GETSETNATIVE(Int, I), 1579 DECLARE_GETSETNATIVE(Long, J), 1580 DECLARE_GETSETNATIVE(Float, F), 1581 DECLARE_GETSETNATIVE(Double, D), 1582 1583 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1584 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1585 1586 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1587 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1588 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1589 1590 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1591 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1592 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1593 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1594 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1595 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1596 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1597 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1598 1599 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1600 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1601 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1602 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1603 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)}, 1604 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1605 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1606 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1607 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1608 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)}, 1609 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)}, 1610 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)}, 1611 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1612 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1613 }; 1614 1615 JNINativeMethod loadavg_method[] = { 1616 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)} 1617 }; 1618 1619 JNINativeMethod prefetch_methods[] = { 1620 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1621 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}, 1622 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1623 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)} 1624 }; 1625 1626 JNINativeMethod memcopy_methods_17[] = { 1627 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)}, 1628 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)} 1629 }; 1630 1631 JNINativeMethod memcopy_methods_15[] = { 1632 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1633 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)} 1634 }; 1635 1636 JNINativeMethod anonk_methods[] = { 1637 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)}, 1638 }; 1639 1640 JNINativeMethod lform_methods[] = { 1641 {CC"shouldBeInitialized",CC"("CLS")Z", FN_PTR(Unsafe_ShouldBeInitialized)}, 1642 }; 1643 1644 JNINativeMethod fence_methods[] = { 1645 {CC"loadFence", CC"()V", FN_PTR(Unsafe_LoadFence)}, 1646 {CC"storeFence", CC"()V", FN_PTR(Unsafe_StoreFence)}, 1647 {CC"fullFence", CC"()V", FN_PTR(Unsafe_FullFence)}, 1648 }; 1649 1650 #undef CC 1651 #undef FN_PTR 1652 1653 #undef ADR 1654 #undef LANG 1655 #undef OBJ 1656 #undef CLS 1657 #undef CTR 1658 #undef FLD 1659 #undef MTH 1660 #undef THR 1661 #undef DC0_Args 1662 #undef DC_Args 1663 1664 #undef DECLARE_GETSETOOP 1665 #undef DECLARE_GETSETNATIVE 1666 1667 1668 /** 1669 * Helper method to register native methods. 1670 */ 1671 static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) { 1672 int status = env->RegisterNatives(clazz, methods, nMethods); 1673 if (status < 0 || env->ExceptionOccurred()) { 1674 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1675 tty->print_cr("Unsafe: failed registering %s", message); 1676 } 1677 env->ExceptionClear(); 1678 return false; 1679 } else { 1680 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1681 tty->print_cr("Unsafe: successfully registered %s", message); 1682 } 1683 return true; 1684 } 1685 } 1686 1687 1688 // This one function is exported, used by NativeLookup. 1689 // The Unsafe_xxx functions above are called only from the interpreter. 1690 // The optimizer looks at names and signatures to recognize 1691 // individual functions. 1692 1693 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls)) 1694 UnsafeWrapper("JVM_RegisterUnsafeMethods"); 1695 { 1696 ThreadToNativeFromVM ttnfv(thread); 1697 1698 // Unsafe methods 1699 { 1700 bool success = false; 1701 // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6 1702 if (!success) { 1703 success = register_natives("1.6 methods", env, unsafecls, methods_16, sizeof(methods_16)/sizeof(JNINativeMethod)); 1704 } 1705 if (!success) { 1706 success = register_natives("1.8 methods", env, unsafecls, methods_18, sizeof(methods_18)/sizeof(JNINativeMethod)); 1707 } 1708 if (!success) { 1709 success = register_natives("1.5 methods", env, unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod)); 1710 } 1711 if (!success) { 1712 success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod)); 1713 } 1714 if (!success) { 1715 success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod)); 1716 } 1717 guarantee(success, "register unsafe natives"); 1718 } 1719 1720 // Unsafe.getLoadAverage 1721 register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod)); 1722 1723 // Prefetch methods 1724 register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod)); 1725 1726 // Memory copy methods 1727 { 1728 bool success = false; 1729 if (!success) { 1730 success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod)); 1731 } 1732 if (!success) { 1733 success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod)); 1734 } 1735 } 1736 1737 // Unsafe.defineAnonymousClass 1738 if (EnableInvokeDynamic) { 1739 register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod)); 1740 } 1741 1742 // Unsafe.shouldBeInitialized 1743 if (EnableInvokeDynamic) { 1744 register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod)); 1745 } 1746 1747 // Fence methods 1748 register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod)); 1749 } 1750 JVM_END