1 /* 2 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/vmSymbols.hpp" 27 #ifndef SERIALGC 28 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" 29 #endif // SERIALGC 30 #include "memory/allocation.inline.hpp" 31 #include "prims/jni.h" 32 #include "prims/jvm.h" 33 #include "runtime/globals.hpp" 34 #include "runtime/interfaceSupport.hpp" 35 #include "runtime/reflection.hpp" 36 #include "runtime/synchronizer.hpp" 37 #include "services/threadService.hpp" 38 #include "utilities/copy.hpp" 39 #include "utilities/dtrace.hpp" 40 41 /* 42 * Implementation of class sun.misc.Unsafe 43 */ 44 45 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long); 46 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t); 47 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t); 48 49 #define MAX_OBJECT_SIZE \ 50 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \ 51 + ((julong)max_jint * sizeof(double)) ) 52 53 54 #define UNSAFE_ENTRY(result_type, header) \ 55 JVM_ENTRY(result_type, header) 56 57 // Can't use UNSAFE_LEAF because it has the signature of a straight 58 // call into the runtime (just like JVM_LEAF, funny that) but it's 59 // called like a Java Native and thus the wrapper built for it passes 60 // arguments like a JNI call. It expects those arguments to be popped 61 // from the stack on Intel like all good JNI args are, and adjusts the 62 // stack according. Since the JVM_LEAF call expects no extra 63 // arguments the stack isn't popped in the C code, is pushed by the 64 // wrapper and we get sick. 65 //#define UNSAFE_LEAF(result_type, header) \ 66 // JVM_LEAF(result_type, header) 67 68 #define UNSAFE_END JVM_END 69 70 #define UnsafeWrapper(arg) /*nothing, for the present*/ 71 72 73 inline void* addr_from_java(jlong addr) { 74 // This assert fails in a variety of ways on 32-bit systems. 75 // It is impossible to predict whether native code that converts 76 // pointers to longs will sign-extend or zero-extend the addresses. 77 //assert(addr == (uintptr_t)addr, "must not be odd high bits"); 78 return (void*)(uintptr_t)addr; 79 } 80 81 inline jlong addr_to_java(void* p) { 82 assert(p == (void*)(uintptr_t)p, "must not be odd high bits"); 83 return (uintptr_t)p; 84 } 85 86 87 // Note: The VM's obj_field and related accessors use byte-scaled 88 // ("unscaled") offsets, just as the unsafe methods do. 89 90 // However, the method Unsafe.fieldOffset explicitly declines to 91 // guarantee this. The field offset values manipulated by the Java user 92 // through the Unsafe API are opaque cookies that just happen to be byte 93 // offsets. We represent this state of affairs by passing the cookies 94 // through conversion functions when going between the VM and the Unsafe API. 95 // The conversion functions just happen to be no-ops at present. 96 97 inline jlong field_offset_to_byte_offset(jlong field_offset) { 98 return field_offset; 99 } 100 101 inline jlong field_offset_from_byte_offset(jlong byte_offset) { 102 return byte_offset; 103 } 104 105 inline jint invocation_key_from_method_slot(jint slot) { 106 return slot; 107 } 108 109 inline jint invocation_key_to_method_slot(jint key) { 110 return key; 111 } 112 113 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) { 114 jlong byte_offset = field_offset_to_byte_offset(field_offset); 115 // Don't allow unsafe to be used to read or write the header word of oops 116 assert(p == NULL || field_offset >= oopDesc::header_size(), "offset must be outside of header"); 117 #ifdef ASSERT 118 if (p != NULL) { 119 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset"); 120 if (byte_offset == (jint)byte_offset) { 121 void* ptr_plus_disp = (address)p + byte_offset; 122 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp, 123 "raw [ptr+disp] must be consistent with oop::field_base"); 124 } 125 } 126 #endif 127 if (sizeof(char*) == sizeof(jint)) // (this constant folds!) 128 return (address)p + (jint) byte_offset; 129 else 130 return (address)p + byte_offset; 131 } 132 133 // Externally callable versions: 134 // (Use these in compiler intrinsics which emulate unsafe primitives.) 135 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) { 136 return field_offset; 137 } 138 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) { 139 return byte_offset; 140 } 141 jint Unsafe_invocation_key_from_method_slot(jint slot) { 142 return invocation_key_from_method_slot(slot); 143 } 144 jint Unsafe_invocation_key_to_method_slot(jint key) { 145 return invocation_key_to_method_slot(key); 146 } 147 148 149 ///// Data in the Java heap. 150 151 #define GET_FIELD(obj, offset, type_name, v) \ 152 oop p = JNIHandles::resolve(obj); \ 153 type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset) 154 155 #define SET_FIELD(obj, offset, type_name, x) \ 156 oop p = JNIHandles::resolve(obj); \ 157 *(type_name*)index_oop_from_field_offset_long(p, offset) = x 158 159 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \ 160 oop p = JNIHandles::resolve(obj); \ 161 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset)); 162 163 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \ 164 oop p = JNIHandles::resolve(obj); \ 165 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x); 166 167 // Macros for oops that check UseCompressedOops 168 169 #define GET_OOP_FIELD(obj, offset, v) \ 170 oop p = JNIHandles::resolve(obj); \ 171 oop v; \ 172 if (UseCompressedOops) { \ 173 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \ 174 v = oopDesc::decode_heap_oop(n); \ 175 } else { \ 176 v = *(oop*)index_oop_from_field_offset_long(p, offset); \ 177 } 178 179 #define GET_OOP_FIELD_VOLATILE(obj, offset, v) \ 180 oop p = JNIHandles::resolve(obj); \ 181 volatile oop v; \ 182 if (UseCompressedOops) { \ 183 volatile narrowOop n = *(volatile narrowOop*)index_oop_from_field_offset_long(p, offset); \ 184 v = oopDesc::decode_heap_oop(n); \ 185 } else { \ 186 v = *(volatile oop*)index_oop_from_field_offset_long(p, offset); \ 187 } \ 188 OrderAccess::acquire(); 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 #ifndef SERIALGC 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 klassOop 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 // SERIALGC 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 #ifndef SERIALGC 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 klassOop 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 // SERIALGC 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 GET_OOP_FIELD_VOLATILE(obj, offset, v) 298 return JNIHandles::make_local(env, v); 299 UNSAFE_END 300 301 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 302 UnsafeWrapper("Unsafe_SetObjectVolatile"); 303 oop x = JNIHandles::resolve(x_h); 304 oop p = JNIHandles::resolve(obj); 305 // Catch VolatileCallSite.target stores (via 306 // CallSite.setTargetVolatile) and check call site dependencies. 307 if ((offset == java_lang_invoke_CallSite::target_offset_in_bytes()) && p->is_a(SystemDictionary::CallSite_klass())) { 308 oop call_site = p; 309 oop method_handle = x; 310 assert(call_site ->is_a(SystemDictionary::CallSite_klass()), "must be"); 311 assert(method_handle->is_a(SystemDictionary::MethodHandle_klass()), "must be"); 312 { 313 // Walk all nmethods depending on this call site. 314 MutexLocker mu(Compile_lock, thread); 315 Universe::flush_dependents_on(call_site, method_handle); 316 } 317 } 318 void* addr = index_oop_from_field_offset_long(p, offset); 319 OrderAccess::release(); 320 if (UseCompressedOops) { 321 oop_store((narrowOop*)addr, x); 322 } else { 323 oop_store((oop*)addr, x); 324 } 325 OrderAccess::fence(); 326 UNSAFE_END 327 328 #if defined(SPARC) || defined(X86) 329 // Sparc and X86 have atomic jlong (8 bytes) instructions 330 331 #else 332 // Keep old code for platforms which may not have atomic jlong (8 bytes) instructions 333 334 // Volatile long versions must use locks if !VM_Version::supports_cx8(). 335 // support_cx8 is a surrogate for 'supports atomic long memory ops'. 336 337 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 338 UnsafeWrapper("Unsafe_GetLongVolatile"); 339 { 340 if (VM_Version::supports_cx8()) { 341 GET_FIELD_VOLATILE(obj, offset, jlong, v); 342 return v; 343 } 344 else { 345 Handle p (THREAD, JNIHandles::resolve(obj)); 346 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 347 ObjectLocker ol(p, THREAD); 348 jlong value = *addr; 349 return value; 350 } 351 } 352 UNSAFE_END 353 354 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) 355 UnsafeWrapper("Unsafe_SetLongVolatile"); 356 { 357 if (VM_Version::supports_cx8()) { 358 SET_FIELD_VOLATILE(obj, offset, jlong, x); 359 } 360 else { 361 Handle p (THREAD, JNIHandles::resolve(obj)); 362 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 363 ObjectLocker ol(p, THREAD); 364 *addr = x; 365 } 366 } 367 UNSAFE_END 368 369 #endif // not SPARC and not X86 370 371 #define DEFINE_GETSETOOP(jboolean, Boolean) \ 372 \ 373 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \ 374 UnsafeWrapper("Unsafe_Get"#Boolean); \ 375 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \ 376 GET_FIELD(obj, offset, jboolean, v); \ 377 return v; \ 378 UNSAFE_END \ 379 \ 380 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \ 381 UnsafeWrapper("Unsafe_Set"#Boolean); \ 382 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \ 383 SET_FIELD(obj, offset, jboolean, x); \ 384 UNSAFE_END \ 385 \ 386 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \ 387 UnsafeWrapper("Unsafe_Get"#Boolean); \ 388 GET_FIELD(obj, offset, jboolean, v); \ 389 return v; \ 390 UNSAFE_END \ 391 \ 392 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \ 393 UnsafeWrapper("Unsafe_Set"#Boolean); \ 394 SET_FIELD(obj, offset, jboolean, x); \ 395 UNSAFE_END \ 396 \ 397 // END DEFINE_GETSETOOP. 398 399 DEFINE_GETSETOOP(jboolean, Boolean) 400 DEFINE_GETSETOOP(jbyte, Byte) 401 DEFINE_GETSETOOP(jshort, Short); 402 DEFINE_GETSETOOP(jchar, Char); 403 DEFINE_GETSETOOP(jint, Int); 404 DEFINE_GETSETOOP(jlong, Long); 405 DEFINE_GETSETOOP(jfloat, Float); 406 DEFINE_GETSETOOP(jdouble, Double); 407 408 #undef DEFINE_GETSETOOP 409 410 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \ 411 \ 412 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \ 413 UnsafeWrapper("Unsafe_Get"#Boolean); \ 414 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \ 415 return v; \ 416 UNSAFE_END \ 417 \ 418 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \ 419 UnsafeWrapper("Unsafe_Set"#Boolean); \ 420 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \ 421 UNSAFE_END \ 422 \ 423 // END DEFINE_GETSETOOP_VOLATILE. 424 425 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) 426 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte) 427 DEFINE_GETSETOOP_VOLATILE(jshort, Short); 428 DEFINE_GETSETOOP_VOLATILE(jchar, Char); 429 DEFINE_GETSETOOP_VOLATILE(jint, Int); 430 DEFINE_GETSETOOP_VOLATILE(jfloat, Float); 431 DEFINE_GETSETOOP_VOLATILE(jdouble, Double); 432 433 #if defined(SPARC) || defined(X86) 434 // Sparc and X86 have atomic jlong (8 bytes) instructions 435 DEFINE_GETSETOOP_VOLATILE(jlong, Long); 436 #endif 437 438 #undef DEFINE_GETSETOOP_VOLATILE 439 440 // The non-intrinsified versions of setOrdered just use setVolatile 441 442 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x)) 443 UnsafeWrapper("Unsafe_SetOrderedInt"); 444 SET_FIELD_VOLATILE(obj, offset, jint, x); 445 UNSAFE_END 446 447 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 448 UnsafeWrapper("Unsafe_SetOrderedObject"); 449 oop x = JNIHandles::resolve(x_h); 450 oop p = JNIHandles::resolve(obj); 451 void* addr = index_oop_from_field_offset_long(p, offset); 452 OrderAccess::release(); 453 if (UseCompressedOops) { 454 oop_store((narrowOop*)addr, x); 455 } else { 456 oop_store((oop*)addr, x); 457 } 458 OrderAccess::fence(); 459 UNSAFE_END 460 461 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) 462 UnsafeWrapper("Unsafe_SetOrderedLong"); 463 #if defined(SPARC) || defined(X86) 464 // Sparc and X86 have atomic jlong (8 bytes) instructions 465 SET_FIELD_VOLATILE(obj, offset, jlong, x); 466 #else 467 // Keep old code for platforms which may not have atomic long (8 bytes) instructions 468 { 469 if (VM_Version::supports_cx8()) { 470 SET_FIELD_VOLATILE(obj, offset, jlong, x); 471 } 472 else { 473 Handle p (THREAD, JNIHandles::resolve(obj)); 474 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 475 ObjectLocker ol(p, THREAD); 476 *addr = x; 477 } 478 } 479 #endif 480 UNSAFE_END 481 482 ////// Data in the C heap. 483 484 // Note: These do not throw NullPointerException for bad pointers. 485 // They just crash. Only a oop base pointer can generate a NullPointerException. 486 // 487 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \ 488 \ 489 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \ 490 UnsafeWrapper("Unsafe_GetNative"#Type); \ 491 void* p = addr_from_java(addr); \ 492 JavaThread* t = JavaThread::current(); \ 493 t->set_doing_unsafe_access(true); \ 494 java_type x = *(volatile native_type*)p; \ 495 t->set_doing_unsafe_access(false); \ 496 return x; \ 497 UNSAFE_END \ 498 \ 499 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \ 500 UnsafeWrapper("Unsafe_SetNative"#Type); \ 501 JavaThread* t = JavaThread::current(); \ 502 t->set_doing_unsafe_access(true); \ 503 void* p = addr_from_java(addr); \ 504 *(volatile native_type*)p = x; \ 505 t->set_doing_unsafe_access(false); \ 506 UNSAFE_END \ 507 \ 508 // END DEFINE_GETSETNATIVE. 509 510 DEFINE_GETSETNATIVE(jbyte, Byte, signed char) 511 DEFINE_GETSETNATIVE(jshort, Short, signed short); 512 DEFINE_GETSETNATIVE(jchar, Char, unsigned short); 513 DEFINE_GETSETNATIVE(jint, Int, jint); 514 // no long -- handled specially 515 DEFINE_GETSETNATIVE(jfloat, Float, float); 516 DEFINE_GETSETNATIVE(jdouble, Double, double); 517 518 #undef DEFINE_GETSETNATIVE 519 520 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr)) 521 UnsafeWrapper("Unsafe_GetNativeLong"); 522 JavaThread* t = JavaThread::current(); 523 // We do it this way to avoid problems with access to heap using 64 524 // bit loads, as jlong in heap could be not 64-bit aligned, and on 525 // some CPUs (SPARC) it leads to SIGBUS. 526 t->set_doing_unsafe_access(true); 527 void* p = addr_from_java(addr); 528 jlong x; 529 if (((intptr_t)p & 7) == 0) { 530 // jlong is aligned, do a volatile access 531 x = *(volatile jlong*)p; 532 } else { 533 jlong_accessor acc; 534 acc.words[0] = ((volatile jint*)p)[0]; 535 acc.words[1] = ((volatile jint*)p)[1]; 536 x = acc.long_value; 537 } 538 t->set_doing_unsafe_access(false); 539 return x; 540 UNSAFE_END 541 542 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 543 UnsafeWrapper("Unsafe_SetNativeLong"); 544 JavaThread* t = JavaThread::current(); 545 // see comment for Unsafe_GetNativeLong 546 t->set_doing_unsafe_access(true); 547 void* p = addr_from_java(addr); 548 if (((intptr_t)p & 7) == 0) { 549 // jlong is aligned, do a volatile access 550 *(volatile jlong*)p = x; 551 } else { 552 jlong_accessor acc; 553 acc.long_value = x; 554 ((volatile jint*)p)[0] = acc.words[0]; 555 ((volatile jint*)p)[1] = acc.words[1]; 556 } 557 t->set_doing_unsafe_access(false); 558 UNSAFE_END 559 560 561 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr)) 562 UnsafeWrapper("Unsafe_GetNativeAddress"); 563 void* p = addr_from_java(addr); 564 return addr_to_java(*(void**)p); 565 UNSAFE_END 566 567 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 568 UnsafeWrapper("Unsafe_SetNativeAddress"); 569 void* p = addr_from_java(addr); 570 *(void**)p = addr_from_java(x); 571 UNSAFE_END 572 573 574 ////// Allocation requests 575 576 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls)) 577 UnsafeWrapper("Unsafe_AllocateInstance"); 578 { 579 ThreadToNativeFromVM ttnfv(thread); 580 return env->AllocObject(cls); 581 } 582 UNSAFE_END 583 584 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size)) 585 UnsafeWrapper("Unsafe_AllocateMemory"); 586 size_t sz = (size_t)size; 587 if (sz != (julong)size || size < 0) { 588 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 589 } 590 if (sz == 0) { 591 return 0; 592 } 593 sz = round_to(sz, HeapWordSize); 594 void* x = os::malloc(sz); 595 if (x == NULL) { 596 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 597 } 598 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize); 599 return addr_to_java(x); 600 UNSAFE_END 601 602 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size)) 603 UnsafeWrapper("Unsafe_ReallocateMemory"); 604 void* p = addr_from_java(addr); 605 size_t sz = (size_t)size; 606 if (sz != (julong)size || size < 0) { 607 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 608 } 609 if (sz == 0) { 610 os::free(p); 611 return 0; 612 } 613 sz = round_to(sz, HeapWordSize); 614 void* x = (p == NULL) ? os::malloc(sz) : os::realloc(p, sz); 615 if (x == NULL) { 616 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 617 } 618 return addr_to_java(x); 619 UNSAFE_END 620 621 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr)) 622 UnsafeWrapper("Unsafe_FreeMemory"); 623 void* p = addr_from_java(addr); 624 if (p == NULL) { 625 return; 626 } 627 os::free(p); 628 UNSAFE_END 629 630 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value)) 631 UnsafeWrapper("Unsafe_SetMemory"); 632 size_t sz = (size_t)size; 633 if (sz != (julong)size || size < 0) { 634 THROW(vmSymbols::java_lang_IllegalArgumentException()); 635 } 636 char* p = (char*) addr_from_java(addr); 637 Copy::fill_to_memory_atomic(p, sz, value); 638 UNSAFE_END 639 640 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value)) 641 UnsafeWrapper("Unsafe_SetMemory"); 642 size_t sz = (size_t)size; 643 if (sz != (julong)size || size < 0) { 644 THROW(vmSymbols::java_lang_IllegalArgumentException()); 645 } 646 oop base = JNIHandles::resolve(obj); 647 void* p = index_oop_from_field_offset_long(base, offset); 648 Copy::fill_to_memory_atomic(p, sz, value); 649 UNSAFE_END 650 651 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size)) 652 UnsafeWrapper("Unsafe_CopyMemory"); 653 if (size == 0) { 654 return; 655 } 656 size_t sz = (size_t)size; 657 if (sz != (julong)size || size < 0) { 658 THROW(vmSymbols::java_lang_IllegalArgumentException()); 659 } 660 void* src = addr_from_java(srcAddr); 661 void* dst = addr_from_java(dstAddr); 662 Copy::conjoint_memory_atomic(src, dst, sz); 663 UNSAFE_END 664 665 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size)) 666 UnsafeWrapper("Unsafe_CopyMemory"); 667 if (size == 0) { 668 return; 669 } 670 size_t sz = (size_t)size; 671 if (sz != (julong)size || size < 0) { 672 THROW(vmSymbols::java_lang_IllegalArgumentException()); 673 } 674 oop srcp = JNIHandles::resolve(srcObj); 675 oop dstp = JNIHandles::resolve(dstObj); 676 if (dstp != NULL && !dstp->is_typeArray()) { 677 // NYI: This works only for non-oop arrays at present. 678 // Generalizing it would be reasonable, but requires card marking. 679 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad. 680 THROW(vmSymbols::java_lang_IllegalArgumentException()); 681 } 682 void* src = index_oop_from_field_offset_long(srcp, srcOffset); 683 void* dst = index_oop_from_field_offset_long(dstp, dstOffset); 684 Copy::conjoint_memory_atomic(src, dst, sz); 685 UNSAFE_END 686 687 688 ////// Random queries 689 690 // See comment at file start about UNSAFE_LEAF 691 //UNSAFE_LEAF(jint, Unsafe_AddressSize()) 692 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe)) 693 UnsafeWrapper("Unsafe_AddressSize"); 694 return sizeof(void*); 695 UNSAFE_END 696 697 // See comment at file start about UNSAFE_LEAF 698 //UNSAFE_LEAF(jint, Unsafe_PageSize()) 699 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe)) 700 UnsafeWrapper("Unsafe_PageSize"); 701 return os::vm_page_size(); 702 UNSAFE_END 703 704 jint find_field_offset(jobject field, int must_be_static, TRAPS) { 705 if (field == NULL) { 706 THROW_0(vmSymbols::java_lang_NullPointerException()); 707 } 708 709 oop reflected = JNIHandles::resolve_non_null(field); 710 oop mirror = java_lang_reflect_Field::clazz(reflected); 711 klassOop k = java_lang_Class::as_klassOop(mirror); 712 int slot = java_lang_reflect_Field::slot(reflected); 713 int modifiers = java_lang_reflect_Field::modifiers(reflected); 714 715 if (must_be_static >= 0) { 716 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0); 717 if (must_be_static != really_is_static) { 718 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 719 } 720 } 721 722 int offset = instanceKlass::cast(k)->field_offset(slot); 723 return field_offset_from_byte_offset(offset); 724 } 725 726 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 727 UnsafeWrapper("Unsafe_ObjectFieldOffset"); 728 return find_field_offset(field, 0, THREAD); 729 UNSAFE_END 730 731 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 732 UnsafeWrapper("Unsafe_StaticFieldOffset"); 733 return find_field_offset(field, 1, THREAD); 734 UNSAFE_END 735 736 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field)) 737 UnsafeWrapper("Unsafe_StaticFieldBase"); 738 // Note: In this VM implementation, a field address is always a short 739 // offset from the base of a a klass metaobject. Thus, the full dynamic 740 // range of the return type is never used. However, some implementations 741 // might put the static field inside an array shared by many classes, 742 // or even at a fixed address, in which case the address could be quite 743 // large. In that last case, this function would return NULL, since 744 // the address would operate alone, without any base pointer. 745 746 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); 747 748 oop reflected = JNIHandles::resolve_non_null(field); 749 oop mirror = java_lang_reflect_Field::clazz(reflected); 750 int modifiers = java_lang_reflect_Field::modifiers(reflected); 751 752 if ((modifiers & JVM_ACC_STATIC) == 0) { 753 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 754 } 755 756 return JNIHandles::make_local(env, mirror); 757 UNSAFE_END 758 759 //@deprecated 760 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 761 UnsafeWrapper("Unsafe_FieldOffset"); 762 // tries (but fails) to be polymorphic between static and non-static: 763 jlong offset = find_field_offset(field, -1, THREAD); 764 guarantee(offset == (jint)offset, "offset fits in 32 bits"); 765 return (jint)offset; 766 UNSAFE_END 767 768 //@deprecated 769 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz)) 770 UnsafeWrapper("Unsafe_StaticFieldBase"); 771 if (clazz == NULL) { 772 THROW_0(vmSymbols::java_lang_NullPointerException()); 773 } 774 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz)); 775 UNSAFE_END 776 777 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) 778 UnsafeWrapper("Unsafe_EnsureClassInitialized"); 779 if (clazz == NULL) { 780 THROW(vmSymbols::java_lang_NullPointerException()); 781 } 782 oop mirror = JNIHandles::resolve_non_null(clazz); 783 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(mirror)); 784 if (k != NULL) { 785 k->initialize(CHECK); 786 } 787 UNSAFE_END 788 789 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) { 790 if (acls == NULL) { 791 THROW(vmSymbols::java_lang_NullPointerException()); 792 } 793 oop mirror = JNIHandles::resolve_non_null(acls); 794 klassOop k = java_lang_Class::as_klassOop(mirror); 795 if (k == NULL || !k->klass_part()->oop_is_array()) { 796 THROW(vmSymbols::java_lang_InvalidClassException()); 797 } else if (k->klass_part()->oop_is_objArray()) { 798 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT); 799 scale = heapOopSize; 800 } else if (k->klass_part()->oop_is_typeArray()) { 801 typeArrayKlass* tak = typeArrayKlass::cast(k); 802 base = tak->array_header_in_bytes(); 803 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok"); 804 scale = (1 << tak->log2_element_size()); 805 } else { 806 ShouldNotReachHere(); 807 } 808 } 809 810 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls)) 811 UnsafeWrapper("Unsafe_ArrayBaseOffset"); 812 int base, scale; 813 getBaseAndScale(base, scale, acls, CHECK_0); 814 return field_offset_from_byte_offset(base); 815 UNSAFE_END 816 817 818 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls)) 819 UnsafeWrapper("Unsafe_ArrayIndexScale"); 820 int base, scale; 821 getBaseAndScale(base, scale, acls, CHECK_0); 822 // This VM packs both fields and array elements down to the byte. 823 // But watch out: If this changes, so that array references for 824 // a given primitive type (say, T_BOOLEAN) use different memory units 825 // than fields, this method MUST return zero for such arrays. 826 // For example, the VM used to store sub-word sized fields in full 827 // words in the object layout, so that accessors like getByte(Object,int) 828 // did not really do what one might expect for arrays. Therefore, 829 // this function used to report a zero scale factor, so that the user 830 // would know not to attempt to access sub-word array elements. 831 // // Code for unpacked fields: 832 // if (scale < wordSize) return 0; 833 834 // The following allows for a pretty general fieldOffset cookie scheme, 835 // but requires it to be linear in byte offset. 836 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0); 837 UNSAFE_END 838 839 840 static inline void throw_new(JNIEnv *env, const char *ename) { 841 char buf[100]; 842 strcpy(buf, "java/lang/"); 843 strcat(buf, ename); 844 jclass cls = env->FindClass(buf); 845 char* msg = NULL; 846 env->ThrowNew(cls, msg); 847 } 848 849 static jclass Unsafe_DefineClass(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) { 850 { 851 // Code lifted from JDK 1.3 ClassLoader.c 852 853 jbyte *body; 854 char *utfName; 855 jclass result = 0; 856 char buf[128]; 857 858 if (UsePerfData) { 859 ClassLoader::unsafe_defineClassCallCounter()->inc(); 860 } 861 862 if (data == NULL) { 863 throw_new(env, "NullPointerException"); 864 return 0; 865 } 866 867 /* Work around 4153825. malloc crashes on Solaris when passed a 868 * negative size. 869 */ 870 if (length < 0) { 871 throw_new(env, "ArrayIndexOutOfBoundsException"); 872 return 0; 873 } 874 875 body = NEW_C_HEAP_ARRAY(jbyte, length); 876 877 if (body == 0) { 878 throw_new(env, "OutOfMemoryError"); 879 return 0; 880 } 881 882 env->GetByteArrayRegion(data, offset, length, body); 883 884 if (env->ExceptionOccurred()) 885 goto free_body; 886 887 if (name != NULL) { 888 uint len = env->GetStringUTFLength(name); 889 int unicode_len = env->GetStringLength(name); 890 if (len >= sizeof(buf)) { 891 utfName = NEW_C_HEAP_ARRAY(char, len + 1); 892 if (utfName == NULL) { 893 throw_new(env, "OutOfMemoryError"); 894 goto free_body; 895 } 896 } else { 897 utfName = buf; 898 } 899 env->GetStringUTFRegion(name, 0, unicode_len, utfName); 900 //VerifyFixClassname(utfName); 901 for (uint i = 0; i < len; i++) { 902 if (utfName[i] == '.') utfName[i] = '/'; 903 } 904 } else { 905 utfName = NULL; 906 } 907 908 result = JVM_DefineClass(env, utfName, loader, body, length, pd); 909 910 if (utfName && utfName != buf) 911 FREE_C_HEAP_ARRAY(char, utfName); 912 913 free_body: 914 FREE_C_HEAP_ARRAY(jbyte, body); 915 return result; 916 } 917 } 918 919 920 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length)) 921 UnsafeWrapper("Unsafe_DefineClass"); 922 { 923 ThreadToNativeFromVM ttnfv(thread); 924 925 int depthFromDefineClass0 = 1; 926 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0); 927 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller); 928 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller); 929 930 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd); 931 } 932 UNSAFE_END 933 934 935 UNSAFE_ENTRY(jclass, Unsafe_DefineClass1(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd)) 936 UnsafeWrapper("Unsafe_DefineClass"); 937 { 938 ThreadToNativeFromVM ttnfv(thread); 939 940 return Unsafe_DefineClass(env, name, data, offset, length, loader, pd); 941 } 942 UNSAFE_END 943 944 #define DAC_Args CLS"[B["OBJ 945 // define a class but do not make it known to the class loader or system dictionary 946 // - host_class: supplies context for linkage, access control, protection domain, and class loader 947 // - data: bytes of a class file, a raw memory address (length gives the number of bytes) 948 // - cp_patches: where non-null entries exist, they replace corresponding CP entries in data 949 950 // When you load an anonymous class U, it works as if you changed its name just before loading, 951 // to a name that you will never use again. Since the name is lost, no other class can directly 952 // link to any member of U. Just after U is loaded, the only way to use it is reflectively, 953 // through java.lang.Class methods like Class.newInstance. 954 955 // Access checks for linkage sites within U continue to follow the same rules as for named classes. 956 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded. 957 // An anonymous class also has special privileges to access any member of its host class. 958 // This is the main reason why this loading operation is unsafe. The purpose of this is to 959 // allow language implementations to simulate "open classes"; a host class in effect gets 960 // new code when an anonymous class is loaded alongside it. A less convenient but more 961 // standard way to do this is with reflection, which can also be set to ignore access 962 // restrictions. 963 964 // Access into an anonymous class is possible only through reflection. Therefore, there 965 // are no special access rules for calling into an anonymous class. The relaxed access 966 // rule for the host class is applied in the opposite direction: A host class reflectively 967 // access one of its anonymous classes. 968 969 // If you load the same bytecodes twice, you get two different classes. You can reload 970 // the same bytecodes with or without varying CP patches. 971 972 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1. 973 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is). 974 // The CONSTANT_Class entry for that name can be patched to refer directly to U1. 975 976 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as 977 // an outer class (so that U2 is an anonymous inner class of anonymous U1). 978 // It is not possible for a named class, or an older anonymous class, to refer by 979 // name (via its CP) to a newer anonymous class. 980 981 // CP patching may also be used to modify (i.e., hack) the names of methods, classes, 982 // or type descriptors used in the loaded anonymous class. 983 984 // Finally, CP patching may be used to introduce "live" objects into the constant pool, 985 // instead of "dead" strings. A compiled statement like println((Object)"hello") can 986 // be changed to println(greeting), where greeting is an arbitrary object created before 987 // the anonymous class is loaded. This is useful in dynamic languages, in which 988 // various kinds of metaobjects must be introduced as constants into bytecode. 989 // Note the cast (Object), which tells the verifier to expect an arbitrary object, 990 // not just a literal string. For such ldc instructions, the verifier uses the 991 // type Object instead of String, if the loaded constant is not in fact a String. 992 993 static oop 994 Unsafe_DefineAnonymousClass_impl(JNIEnv *env, 995 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh, 996 HeapWord* *temp_alloc, 997 TRAPS) { 998 999 if (UsePerfData) { 1000 ClassLoader::unsafe_defineClassCallCounter()->inc(); 1001 } 1002 1003 if (data == NULL) { 1004 THROW_0(vmSymbols::java_lang_NullPointerException()); 1005 } 1006 1007 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length(); 1008 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord); 1009 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length); 1010 if (body == NULL) { 1011 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 1012 } 1013 1014 // caller responsible to free it: 1015 (*temp_alloc) = body; 1016 1017 { 1018 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0); 1019 Copy::conjoint_words((HeapWord*) array_base, body, word_length); 1020 } 1021 1022 u1* class_bytes = (u1*) body; 1023 int class_bytes_length = (int) length; 1024 if (class_bytes_length < 0) class_bytes_length = 0; 1025 if (class_bytes == NULL 1026 || host_class == NULL 1027 || length != class_bytes_length) 1028 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 1029 1030 objArrayHandle cp_patches_h; 1031 if (cp_patches_jh != NULL) { 1032 oop p = JNIHandles::resolve_non_null(cp_patches_jh); 1033 if (!p->is_objArray()) 1034 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 1035 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p); 1036 } 1037 1038 KlassHandle host_klass(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(host_class))); 1039 const char* host_source = host_klass->external_name(); 1040 Handle host_loader(THREAD, host_klass->class_loader()); 1041 Handle host_domain(THREAD, host_klass->protection_domain()); 1042 1043 GrowableArray<Handle>* cp_patches = NULL; 1044 if (cp_patches_h.not_null()) { 1045 int alen = cp_patches_h->length(); 1046 for (int i = alen-1; i >= 0; i--) { 1047 oop p = cp_patches_h->obj_at(i); 1048 if (p != NULL) { 1049 Handle patch(THREAD, p); 1050 if (cp_patches == NULL) 1051 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle()); 1052 cp_patches->at_put(i, patch); 1053 } 1054 } 1055 } 1056 1057 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source); 1058 1059 instanceKlassHandle anon_klass; 1060 { 1061 Symbol* no_class_name = NULL; 1062 klassOop anonk = SystemDictionary::parse_stream(no_class_name, 1063 host_loader, host_domain, 1064 &st, host_klass, cp_patches, 1065 CHECK_NULL); 1066 if (anonk == NULL) return NULL; 1067 anon_klass = instanceKlassHandle(THREAD, anonk); 1068 } 1069 1070 // let caller initialize it as needed... 1071 1072 return anon_klass->java_mirror(); 1073 } 1074 1075 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh)) 1076 { 1077 UnsafeWrapper("Unsafe_DefineAnonymousClass"); 1078 ResourceMark rm(THREAD); 1079 1080 HeapWord* temp_alloc = NULL; 1081 1082 jobject res_jh = NULL; 1083 1084 { oop res_oop = Unsafe_DefineAnonymousClass_impl(env, 1085 host_class, data, cp_patches_jh, 1086 &temp_alloc, THREAD); 1087 if (res_oop != NULL) 1088 res_jh = JNIHandles::make_local(env, res_oop); 1089 } 1090 1091 // try/finally clause: 1092 if (temp_alloc != NULL) { 1093 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc); 1094 } 1095 1096 return (jclass) res_jh; 1097 } 1098 UNSAFE_END 1099 1100 1101 1102 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 1103 UnsafeWrapper("Unsafe_MonitorEnter"); 1104 { 1105 if (jobj == NULL) { 1106 THROW(vmSymbols::java_lang_NullPointerException()); 1107 } 1108 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 1109 ObjectSynchronizer::jni_enter(obj, CHECK); 1110 } 1111 UNSAFE_END 1112 1113 1114 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 1115 UnsafeWrapper("Unsafe_TryMonitorEnter"); 1116 { 1117 if (jobj == NULL) { 1118 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 1119 } 1120 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 1121 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0); 1122 return (res ? JNI_TRUE : JNI_FALSE); 1123 } 1124 UNSAFE_END 1125 1126 1127 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj)) 1128 UnsafeWrapper("Unsafe_MonitorExit"); 1129 { 1130 if (jobj == NULL) { 1131 THROW(vmSymbols::java_lang_NullPointerException()); 1132 } 1133 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj)); 1134 ObjectSynchronizer::jni_exit(obj(), CHECK); 1135 } 1136 UNSAFE_END 1137 1138 1139 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr)) 1140 UnsafeWrapper("Unsafe_ThrowException"); 1141 { 1142 ThreadToNativeFromVM ttnfv(thread); 1143 env->Throw(thr); 1144 } 1145 UNSAFE_END 1146 1147 // JSR166 ------------------------------------------------------------------ 1148 1149 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h)) 1150 UnsafeWrapper("Unsafe_CompareAndSwapObject"); 1151 oop x = JNIHandles::resolve(x_h); 1152 oop e = JNIHandles::resolve(e_h); 1153 oop p = JNIHandles::resolve(obj); 1154 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset); 1155 if (UseCompressedOops) { 1156 update_barrier_set_pre((narrowOop*)addr, e); 1157 } else { 1158 update_barrier_set_pre((oop*)addr, e); 1159 } 1160 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e); 1161 jboolean success = (res == e); 1162 if (success) 1163 update_barrier_set((void*)addr, x); 1164 return success; 1165 UNSAFE_END 1166 1167 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x)) 1168 UnsafeWrapper("Unsafe_CompareAndSwapInt"); 1169 oop p = JNIHandles::resolve(obj); 1170 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset); 1171 return (jint)(Atomic::cmpxchg(x, addr, e)) == e; 1172 UNSAFE_END 1173 1174 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x)) 1175 UnsafeWrapper("Unsafe_CompareAndSwapLong"); 1176 Handle p (THREAD, JNIHandles::resolve(obj)); 1177 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 1178 if (VM_Version::supports_cx8()) 1179 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e; 1180 else { 1181 jboolean success = false; 1182 ObjectLocker ol(p, THREAD); 1183 if (*addr == e) { *addr = x; success = true; } 1184 return success; 1185 } 1186 UNSAFE_END 1187 1188 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time)) 1189 UnsafeWrapper("Unsafe_Park"); 1190 HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time); 1191 JavaThreadParkedState jtps(thread, time != 0); 1192 thread->parker()->park(isAbsolute != 0, time); 1193 HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker()); 1194 UNSAFE_END 1195 1196 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread)) 1197 UnsafeWrapper("Unsafe_Unpark"); 1198 Parker* p = NULL; 1199 if (jthread != NULL) { 1200 oop java_thread = JNIHandles::resolve_non_null(jthread); 1201 if (java_thread != NULL) { 1202 jlong lp = java_lang_Thread::park_event(java_thread); 1203 if (lp != 0) { 1204 // This cast is OK even though the jlong might have been read 1205 // non-atomically on 32bit systems, since there, one word will 1206 // always be zero anyway and the value set is always the same 1207 p = (Parker*)addr_from_java(lp); 1208 } else { 1209 // Grab lock if apparently null or using older version of library 1210 MutexLocker mu(Threads_lock); 1211 java_thread = JNIHandles::resolve_non_null(jthread); 1212 if (java_thread != NULL) { 1213 JavaThread* thr = java_lang_Thread::thread(java_thread); 1214 if (thr != NULL) { 1215 p = thr->parker(); 1216 if (p != NULL) { // Bind to Java thread for next time. 1217 java_lang_Thread::set_park_event(java_thread, addr_to_java(p)); 1218 } 1219 } 1220 } 1221 } 1222 } 1223 } 1224 if (p != NULL) { 1225 HS_DTRACE_PROBE1(hotspot, thread__unpark, p); 1226 p->unpark(); 1227 } 1228 UNSAFE_END 1229 1230 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem)) 1231 UnsafeWrapper("Unsafe_Loadavg"); 1232 const int max_nelem = 3; 1233 double la[max_nelem]; 1234 jint ret; 1235 1236 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg)); 1237 assert(a->is_typeArray(), "must be type array"); 1238 1239 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) { 1240 ThreadToNativeFromVM ttnfv(thread); 1241 throw_new(env, "ArrayIndexOutOfBoundsException"); 1242 return -1; 1243 } 1244 1245 ret = os::loadavg(la, nelem); 1246 if (ret == -1) return -1; 1247 1248 // if successful, ret is the number of samples actually retrieved. 1249 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value"); 1250 switch(ret) { 1251 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through 1252 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through 1253 case 1: a->double_at_put(0, (jdouble)la[0]); break; 1254 } 1255 return ret; 1256 UNSAFE_END 1257 1258 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 1259 UnsafeWrapper("Unsafe_PrefetchRead"); 1260 oop p = JNIHandles::resolve(obj); 1261 void* addr = index_oop_from_field_offset_long(p, 0); 1262 Prefetch::read(addr, (intx)offset); 1263 UNSAFE_END 1264 1265 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 1266 UnsafeWrapper("Unsafe_PrefetchWrite"); 1267 oop p = JNIHandles::resolve(obj); 1268 void* addr = index_oop_from_field_offset_long(p, 0); 1269 Prefetch::write(addr, (intx)offset); 1270 UNSAFE_END 1271 1272 1273 /// JVM_RegisterUnsafeMethods 1274 1275 #define ADR "J" 1276 1277 #define LANG "Ljava/lang/" 1278 1279 #define OBJ LANG"Object;" 1280 #define CLS LANG"Class;" 1281 #define CTR LANG"reflect/Constructor;" 1282 #define FLD LANG"reflect/Field;" 1283 #define MTH LANG"reflect/Method;" 1284 #define THR LANG"Throwable;" 1285 1286 #define DC0_Args LANG"String;[BII" 1287 #define DC1_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;" 1288 1289 #define CC (char*) /*cast a literal from (const char*)*/ 1290 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1291 1292 // define deprecated accessors for compabitility with 1.4.0 1293 #define DECLARE_GETSETOOP_140(Boolean, Z) \ 1294 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \ 1295 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)} 1296 1297 // Note: In 1.4.1, getObject and kin take both int and long offsets. 1298 #define DECLARE_GETSETOOP_141(Boolean, Z) \ 1299 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1300 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)} 1301 1302 // Note: In 1.5.0, there are volatile versions too 1303 #define DECLARE_GETSETOOP(Boolean, Z) \ 1304 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1305 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \ 1306 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \ 1307 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)} 1308 1309 1310 #define DECLARE_GETSETNATIVE(Byte, B) \ 1311 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \ 1312 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)} 1313 1314 1315 1316 // %%% These are temporarily supported until the SDK sources 1317 // contain the necessarily updated Unsafe.java. 1318 static JNINativeMethod methods_140[] = { 1319 1320 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)}, 1321 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)}, 1322 1323 DECLARE_GETSETOOP_140(Boolean, Z), 1324 DECLARE_GETSETOOP_140(Byte, B), 1325 DECLARE_GETSETOOP_140(Short, S), 1326 DECLARE_GETSETOOP_140(Char, C), 1327 DECLARE_GETSETOOP_140(Int, I), 1328 DECLARE_GETSETOOP_140(Long, J), 1329 DECLARE_GETSETOOP_140(Float, F), 1330 DECLARE_GETSETOOP_140(Double, D), 1331 1332 DECLARE_GETSETNATIVE(Byte, B), 1333 DECLARE_GETSETNATIVE(Short, S), 1334 DECLARE_GETSETNATIVE(Char, C), 1335 DECLARE_GETSETNATIVE(Int, I), 1336 DECLARE_GETSETNATIVE(Long, J), 1337 DECLARE_GETSETNATIVE(Float, F), 1338 DECLARE_GETSETNATIVE(Double, D), 1339 1340 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1341 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1342 1343 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1344 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1345 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1346 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}, 1347 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1348 1349 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, //deprecated 1350 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, //deprecated 1351 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1352 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1353 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1354 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1355 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1356 1357 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1358 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)}, 1359 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1360 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1361 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1362 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)} 1363 }; 1364 1365 // These are the old methods prior to the JSR 166 changes in 1.5.0 1366 static JNINativeMethod methods_141[] = { 1367 1368 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1369 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1370 1371 DECLARE_GETSETOOP_141(Boolean, Z), 1372 DECLARE_GETSETOOP_141(Byte, B), 1373 DECLARE_GETSETOOP_141(Short, S), 1374 DECLARE_GETSETOOP_141(Char, C), 1375 DECLARE_GETSETOOP_141(Int, I), 1376 DECLARE_GETSETOOP_141(Long, J), 1377 DECLARE_GETSETOOP_141(Float, F), 1378 DECLARE_GETSETOOP_141(Double, D), 1379 1380 DECLARE_GETSETNATIVE(Byte, B), 1381 DECLARE_GETSETNATIVE(Short, S), 1382 DECLARE_GETSETNATIVE(Char, C), 1383 DECLARE_GETSETNATIVE(Int, I), 1384 DECLARE_GETSETNATIVE(Long, J), 1385 DECLARE_GETSETNATIVE(Float, F), 1386 DECLARE_GETSETNATIVE(Double, D), 1387 1388 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1389 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1390 1391 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1392 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1393 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1394 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}, 1395 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1396 1397 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1398 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1399 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 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"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)}, 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 1415 // These are the old methods prior to the JSR 166 changes in 1.6.0 1416 static JNINativeMethod methods_15[] = { 1417 1418 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1419 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1420 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1421 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1422 1423 1424 DECLARE_GETSETOOP(Boolean, Z), 1425 DECLARE_GETSETOOP(Byte, B), 1426 DECLARE_GETSETOOP(Short, S), 1427 DECLARE_GETSETOOP(Char, C), 1428 DECLARE_GETSETOOP(Int, I), 1429 DECLARE_GETSETOOP(Long, J), 1430 DECLARE_GETSETOOP(Float, F), 1431 DECLARE_GETSETOOP(Double, D), 1432 1433 DECLARE_GETSETNATIVE(Byte, B), 1434 DECLARE_GETSETNATIVE(Short, S), 1435 DECLARE_GETSETNATIVE(Char, C), 1436 DECLARE_GETSETNATIVE(Int, I), 1437 DECLARE_GETSETNATIVE(Long, J), 1438 DECLARE_GETSETNATIVE(Float, F), 1439 DECLARE_GETSETNATIVE(Double, D), 1440 1441 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1442 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1443 1444 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1445 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1446 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1447 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}, 1448 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1449 1450 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1451 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1452 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1453 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1454 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1455 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1456 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1457 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1458 1459 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1460 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)}, 1461 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1462 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1463 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1464 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1465 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1466 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1467 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1468 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1469 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1470 1471 }; 1472 1473 // These are the correct methods, moving forward: 1474 static JNINativeMethod methods[] = { 1475 1476 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1477 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1478 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1479 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1480 1481 1482 DECLARE_GETSETOOP(Boolean, Z), 1483 DECLARE_GETSETOOP(Byte, B), 1484 DECLARE_GETSETOOP(Short, S), 1485 DECLARE_GETSETOOP(Char, C), 1486 DECLARE_GETSETOOP(Int, I), 1487 DECLARE_GETSETOOP(Long, J), 1488 DECLARE_GETSETOOP(Float, F), 1489 DECLARE_GETSETOOP(Double, D), 1490 1491 DECLARE_GETSETNATIVE(Byte, B), 1492 DECLARE_GETSETNATIVE(Short, S), 1493 DECLARE_GETSETNATIVE(Char, C), 1494 DECLARE_GETSETNATIVE(Int, I), 1495 DECLARE_GETSETNATIVE(Long, J), 1496 DECLARE_GETSETNATIVE(Float, F), 1497 DECLARE_GETSETNATIVE(Double, D), 1498 1499 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1500 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1501 1502 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1503 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1504 // {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1505 // {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)}, 1506 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1507 1508 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1509 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1510 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1511 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1512 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1513 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1514 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1515 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1516 1517 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1518 {CC"defineClass", CC"("DC1_Args")"CLS, FN_PTR(Unsafe_DefineClass1)}, 1519 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1520 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1521 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1522 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)}, 1523 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1524 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1525 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1526 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1527 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)}, 1528 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)}, 1529 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)}, 1530 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1531 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1532 1533 // {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)}, 1534 1535 // {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1536 // {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)} 1537 // {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1538 // {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)} 1539 1540 }; 1541 1542 JNINativeMethod loadavg_method[] = { 1543 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)} 1544 }; 1545 1546 JNINativeMethod prefetch_methods[] = { 1547 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1548 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}, 1549 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1550 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)} 1551 }; 1552 1553 JNINativeMethod memcopy_methods[] = { 1554 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)}, 1555 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)} 1556 }; 1557 1558 JNINativeMethod memcopy_methods_15[] = { 1559 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1560 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)} 1561 }; 1562 1563 JNINativeMethod anonk_methods[] = { 1564 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)}, 1565 }; 1566 1567 #undef CC 1568 #undef FN_PTR 1569 1570 #undef ADR 1571 #undef LANG 1572 #undef OBJ 1573 #undef CLS 1574 #undef CTR 1575 #undef FLD 1576 #undef MTH 1577 #undef THR 1578 #undef DC0_Args 1579 #undef DC1_Args 1580 1581 #undef DECLARE_GETSETOOP 1582 #undef DECLARE_GETSETNATIVE 1583 1584 1585 // This one function is exported, used by NativeLookup. 1586 // The Unsafe_xxx functions above are called only from the interpreter. 1587 // The optimizer looks at names and signatures to recognize 1588 // individual functions. 1589 1590 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls)) 1591 UnsafeWrapper("JVM_RegisterUnsafeMethods"); 1592 { 1593 ThreadToNativeFromVM ttnfv(thread); 1594 { 1595 env->RegisterNatives(unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod)); 1596 if (env->ExceptionOccurred()) { 1597 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1598 tty->print_cr("Warning: SDK 1.6 Unsafe.loadavg not found."); 1599 } 1600 env->ExceptionClear(); 1601 } 1602 } 1603 { 1604 env->RegisterNatives(unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod)); 1605 if (env->ExceptionOccurred()) { 1606 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1607 tty->print_cr("Warning: SDK 1.6 Unsafe.prefetchRead/Write not found."); 1608 } 1609 env->ExceptionClear(); 1610 } 1611 } 1612 { 1613 env->RegisterNatives(unsafecls, memcopy_methods, sizeof(memcopy_methods)/sizeof(JNINativeMethod)); 1614 if (env->ExceptionOccurred()) { 1615 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1616 tty->print_cr("Warning: SDK 1.7 Unsafe.copyMemory not found."); 1617 } 1618 env->ExceptionClear(); 1619 env->RegisterNatives(unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod)); 1620 if (env->ExceptionOccurred()) { 1621 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1622 tty->print_cr("Warning: SDK 1.5 Unsafe.copyMemory not found."); 1623 } 1624 env->ExceptionClear(); 1625 } 1626 } 1627 } 1628 if (EnableInvokeDynamic) { 1629 env->RegisterNatives(unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod)); 1630 if (env->ExceptionOccurred()) { 1631 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1632 tty->print_cr("Warning: SDK 1.7 Unsafe.defineClass (anonymous version) not found."); 1633 } 1634 env->ExceptionClear(); 1635 } 1636 } 1637 int status = env->RegisterNatives(unsafecls, methods, sizeof(methods)/sizeof(JNINativeMethod)); 1638 if (env->ExceptionOccurred()) { 1639 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1640 tty->print_cr("Warning: SDK 1.6 version of Unsafe not found."); 1641 } 1642 env->ExceptionClear(); 1643 // %%% For now, be backward compatible with an older class: 1644 status = env->RegisterNatives(unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod)); 1645 } 1646 if (env->ExceptionOccurred()) { 1647 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1648 tty->print_cr("Warning: SDK 1.5 version of Unsafe not found."); 1649 } 1650 env->ExceptionClear(); 1651 // %%% For now, be backward compatible with an older class: 1652 status = env->RegisterNatives(unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod)); 1653 } 1654 if (env->ExceptionOccurred()) { 1655 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1656 tty->print_cr("Warning: SDK 1.4.1 version of Unsafe not found."); 1657 } 1658 env->ExceptionClear(); 1659 // %%% For now, be backward compatible with an older class: 1660 status = env->RegisterNatives(unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod)); 1661 } 1662 guarantee(status == 0, "register unsafe natives"); 1663 } 1664 JVM_END