unsafe.cpp revision 6402:2377269bd73d
1/* 2 * Copyright (c) 2000, 2013, 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/orderAccess.inline.hpp" 37#include "runtime/reflection.hpp" 38#include "runtime/synchronizer.hpp" 39#include "services/threadService.hpp" 40#include "trace/tracing.hpp" 41#include "utilities/copy.hpp" 42#include "utilities/dtrace.hpp" 43 44/* 45 * Implementation of class sun.misc.Unsafe 46 */ 47 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 73inline 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 81inline 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 97inline jlong field_offset_to_byte_offset(jlong field_offset) { 98 return field_offset; 99} 100 101inline jlong field_offset_from_byte_offset(jlong byte_offset) { 102 return byte_offset; 103} 104 105inline jint invocation_key_from_method_slot(jint slot) { 106 return slot; 107} 108 109inline jint invocation_key_to_method_slot(jint key) { 110 return key; 111} 112 113inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) { 114 jlong byte_offset = field_offset_to_byte_offset(field_offset); 115#ifdef ASSERT 116 if (p != NULL) { 117 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset"); 118 if (byte_offset == (jint)byte_offset) { 119 void* ptr_plus_disp = (address)p + byte_offset; 120 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp, 121 "raw [ptr+disp] must be consistent with oop::field_base"); 122 } 123 jlong p_size = HeapWordSize * (jlong)(p->size()); 124 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size)); 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.) 135jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) { 136 return field_offset; 137} 138jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) { 139 return byte_offset; 140} 141jint Unsafe_invocation_key_from_method_slot(jint slot) { 142 return invocation_key_from_method_slot(slot); 143} 144jint 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 if (support_IRIW_for_not_multiple_copy_atomic_cpu) { \ 162 OrderAccess::fence(); \ 163 } \ 164 volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset)); 165 166#define SET_FIELD_VOLATILE(obj, offset, type_name, x) \ 167 oop p = JNIHandles::resolve(obj); \ 168 OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x); 169 170// Macros for oops that check UseCompressedOops 171 172#define GET_OOP_FIELD(obj, offset, v) \ 173 oop p = JNIHandles::resolve(obj); \ 174 oop v; \ 175 if (UseCompressedOops) { \ 176 narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \ 177 v = oopDesc::decode_heap_oop(n); \ 178 } else { \ 179 v = *(oop*)index_oop_from_field_offset_long(p, offset); \ 180 } 181 182 183// Get/SetObject must be special-cased, since it works with handles. 184 185// The xxx140 variants for backward compatibility do not allow a full-width offset. 186UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) 187 UnsafeWrapper("Unsafe_GetObject"); 188 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); 189 GET_OOP_FIELD(obj, offset, v) 190 jobject ret = JNIHandles::make_local(env, v); 191#if INCLUDE_ALL_GCS 192 // We could be accessing the referent field in a reference 193 // object. If G1 is enabled then we need to register a non-null 194 // referent with the SATB barrier. 195 if (UseG1GC) { 196 bool needs_barrier = false; 197 198 if (ret != NULL) { 199 if (offset == java_lang_ref_Reference::referent_offset) { 200 oop o = JNIHandles::resolve_non_null(obj); 201 Klass* k = o->klass(); 202 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) { 203 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity"); 204 needs_barrier = true; 205 } 206 } 207 } 208 209 if (needs_barrier) { 210 oop referent = JNIHandles::resolve(ret); 211 G1SATBCardTableModRefBS::enqueue(referent); 212 } 213 } 214#endif // INCLUDE_ALL_GCS 215 return ret; 216UNSAFE_END 217 218UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h)) 219 UnsafeWrapper("Unsafe_SetObject"); 220 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); 221 oop x = JNIHandles::resolve(x_h); 222 //SET_FIELD(obj, offset, oop, x); 223 oop p = JNIHandles::resolve(obj); 224 if (UseCompressedOops) { 225 if (x != NULL) { 226 // If there is a heap base pointer, we are obliged to emit a store barrier. 227 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 228 } else { 229 narrowOop n = oopDesc::encode_heap_oop_not_null(x); 230 *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n; 231 } 232 } else { 233 if (x != NULL) { 234 // If there is a heap base pointer, we are obliged to emit a store barrier. 235 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 236 } else { 237 *(oop*)index_oop_from_field_offset_long(p, offset) = x; 238 } 239 } 240UNSAFE_END 241 242// The normal variants allow a null base pointer with an arbitrary address. 243// But if the base pointer is non-null, the offset should make some sense. 244// That is, it should be in the range [0, MAX_OBJECT_SIZE]. 245UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 246 UnsafeWrapper("Unsafe_GetObject"); 247 GET_OOP_FIELD(obj, offset, v) 248 jobject ret = JNIHandles::make_local(env, v); 249#if INCLUDE_ALL_GCS 250 // We could be accessing the referent field in a reference 251 // object. If G1 is enabled then we need to register non-null 252 // referent with the SATB barrier. 253 if (UseG1GC) { 254 bool needs_barrier = false; 255 256 if (ret != NULL) { 257 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) { 258 oop o = JNIHandles::resolve(obj); 259 Klass* k = o->klass(); 260 if (InstanceKlass::cast(k)->reference_type() != REF_NONE) { 261 assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity"); 262 needs_barrier = true; 263 } 264 } 265 } 266 267 if (needs_barrier) { 268 oop referent = JNIHandles::resolve(ret); 269 G1SATBCardTableModRefBS::enqueue(referent); 270 } 271 } 272#endif // INCLUDE_ALL_GCS 273 return ret; 274UNSAFE_END 275 276UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 277 UnsafeWrapper("Unsafe_SetObject"); 278 oop x = JNIHandles::resolve(x_h); 279 oop p = JNIHandles::resolve(obj); 280 if (UseCompressedOops) { 281 oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x); 282 } else { 283 oop_store((oop*)index_oop_from_field_offset_long(p, offset), x); 284 } 285UNSAFE_END 286 287UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 288 UnsafeWrapper("Unsafe_GetObjectVolatile"); 289 oop p = JNIHandles::resolve(obj); 290 void* addr = index_oop_from_field_offset_long(p, offset); 291 volatile oop v; 292 if (UseCompressedOops) { 293 volatile narrowOop n = *(volatile narrowOop*) addr; 294 (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n)); 295 } else { 296 (void)const_cast<oop&>(v = *(volatile oop*) addr); 297 } 298 OrderAccess::acquire(); 299 return JNIHandles::make_local(env, v); 300UNSAFE_END 301 302UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 303 UnsafeWrapper("Unsafe_SetObjectVolatile"); 304 oop x = JNIHandles::resolve(x_h); 305 oop p = JNIHandles::resolve(obj); 306 void* addr = index_oop_from_field_offset_long(p, offset); 307 OrderAccess::release(); 308 if (UseCompressedOops) { 309 oop_store((narrowOop*)addr, x); 310 } else { 311 oop_store((oop*)addr, x); 312 } 313 OrderAccess::fence(); 314UNSAFE_END 315 316#ifndef SUPPORTS_NATIVE_CX8 317// Keep old code for platforms which may not have atomic jlong (8 bytes) instructions 318 319// Volatile long versions must use locks if !VM_Version::supports_cx8(). 320// support_cx8 is a surrogate for 'supports atomic long memory ops'. 321 322UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 323 UnsafeWrapper("Unsafe_GetLongVolatile"); 324 { 325 if (VM_Version::supports_cx8()) { 326 GET_FIELD_VOLATILE(obj, offset, jlong, v); 327 return v; 328 } 329 else { 330 Handle p (THREAD, JNIHandles::resolve(obj)); 331 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 332 ObjectLocker ol(p, THREAD); 333 jlong value = *addr; 334 return value; 335 } 336 } 337UNSAFE_END 338 339UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) 340 UnsafeWrapper("Unsafe_SetLongVolatile"); 341 { 342 if (VM_Version::supports_cx8()) { 343 SET_FIELD_VOLATILE(obj, offset, jlong, x); 344 } 345 else { 346 Handle p (THREAD, JNIHandles::resolve(obj)); 347 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 348 ObjectLocker ol(p, THREAD); 349 *addr = x; 350 } 351 } 352UNSAFE_END 353 354#endif // not SUPPORTS_NATIVE_CX8 355 356#define DEFINE_GETSETOOP(jboolean, Boolean) \ 357 \ 358UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \ 359 UnsafeWrapper("Unsafe_Get"#Boolean); \ 360 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); \ 361 GET_FIELD(obj, offset, jboolean, v); \ 362 return v; \ 363UNSAFE_END \ 364 \ 365UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \ 366 UnsafeWrapper("Unsafe_Set"#Boolean); \ 367 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); \ 368 SET_FIELD(obj, offset, jboolean, x); \ 369UNSAFE_END \ 370 \ 371UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \ 372 UnsafeWrapper("Unsafe_Get"#Boolean); \ 373 GET_FIELD(obj, offset, jboolean, v); \ 374 return v; \ 375UNSAFE_END \ 376 \ 377UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \ 378 UnsafeWrapper("Unsafe_Set"#Boolean); \ 379 SET_FIELD(obj, offset, jboolean, x); \ 380UNSAFE_END \ 381 \ 382// END DEFINE_GETSETOOP. 383 384DEFINE_GETSETOOP(jboolean, Boolean) 385DEFINE_GETSETOOP(jbyte, Byte) 386DEFINE_GETSETOOP(jshort, Short); 387DEFINE_GETSETOOP(jchar, Char); 388DEFINE_GETSETOOP(jint, Int); 389DEFINE_GETSETOOP(jlong, Long); 390DEFINE_GETSETOOP(jfloat, Float); 391DEFINE_GETSETOOP(jdouble, Double); 392 393#undef DEFINE_GETSETOOP 394 395#define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \ 396 \ 397UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \ 398 UnsafeWrapper("Unsafe_Get"#Boolean); \ 399 GET_FIELD_VOLATILE(obj, offset, jboolean, v); \ 400 return v; \ 401UNSAFE_END \ 402 \ 403UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \ 404 UnsafeWrapper("Unsafe_Set"#Boolean); \ 405 SET_FIELD_VOLATILE(obj, offset, jboolean, x); \ 406UNSAFE_END \ 407 \ 408// END DEFINE_GETSETOOP_VOLATILE. 409 410DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) 411DEFINE_GETSETOOP_VOLATILE(jbyte, Byte) 412DEFINE_GETSETOOP_VOLATILE(jshort, Short); 413DEFINE_GETSETOOP_VOLATILE(jchar, Char); 414DEFINE_GETSETOOP_VOLATILE(jint, Int); 415DEFINE_GETSETOOP_VOLATILE(jfloat, Float); 416DEFINE_GETSETOOP_VOLATILE(jdouble, Double); 417 418#ifdef SUPPORTS_NATIVE_CX8 419DEFINE_GETSETOOP_VOLATILE(jlong, Long); 420#endif 421 422#undef DEFINE_GETSETOOP_VOLATILE 423 424// The non-intrinsified versions of setOrdered just use setVolatile 425 426UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x)) 427 UnsafeWrapper("Unsafe_SetOrderedInt"); 428 SET_FIELD_VOLATILE(obj, offset, jint, x); 429UNSAFE_END 430 431UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 432 UnsafeWrapper("Unsafe_SetOrderedObject"); 433 oop x = JNIHandles::resolve(x_h); 434 oop p = JNIHandles::resolve(obj); 435 void* addr = index_oop_from_field_offset_long(p, offset); 436 OrderAccess::release(); 437 if (UseCompressedOops) { 438 oop_store((narrowOop*)addr, x); 439 } else { 440 oop_store((oop*)addr, x); 441 } 442 OrderAccess::fence(); 443UNSAFE_END 444 445UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x)) 446 UnsafeWrapper("Unsafe_SetOrderedLong"); 447#ifdef SUPPORTS_NATIVE_CX8 448 SET_FIELD_VOLATILE(obj, offset, jlong, x); 449#else 450 // Keep old code for platforms which may not have atomic long (8 bytes) instructions 451 { 452 if (VM_Version::supports_cx8()) { 453 SET_FIELD_VOLATILE(obj, offset, jlong, x); 454 } 455 else { 456 Handle p (THREAD, JNIHandles::resolve(obj)); 457 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 458 ObjectLocker ol(p, THREAD); 459 *addr = x; 460 } 461 } 462#endif 463UNSAFE_END 464 465UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe)) 466 UnsafeWrapper("Unsafe_LoadFence"); 467 OrderAccess::acquire(); 468UNSAFE_END 469 470UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe)) 471 UnsafeWrapper("Unsafe_StoreFence"); 472 OrderAccess::release(); 473UNSAFE_END 474 475UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe)) 476 UnsafeWrapper("Unsafe_FullFence"); 477 OrderAccess::fence(); 478UNSAFE_END 479 480////// Data in the C heap. 481 482// Note: These do not throw NullPointerException for bad pointers. 483// They just crash. Only a oop base pointer can generate a NullPointerException. 484// 485#define DEFINE_GETSETNATIVE(java_type, Type, native_type) \ 486 \ 487UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \ 488 UnsafeWrapper("Unsafe_GetNative"#Type); \ 489 void* p = addr_from_java(addr); \ 490 JavaThread* t = JavaThread::current(); \ 491 t->set_doing_unsafe_access(true); \ 492 java_type x = *(volatile native_type*)p; \ 493 t->set_doing_unsafe_access(false); \ 494 return x; \ 495UNSAFE_END \ 496 \ 497UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \ 498 UnsafeWrapper("Unsafe_SetNative"#Type); \ 499 JavaThread* t = JavaThread::current(); \ 500 t->set_doing_unsafe_access(true); \ 501 void* p = addr_from_java(addr); \ 502 *(volatile native_type*)p = x; \ 503 t->set_doing_unsafe_access(false); \ 504UNSAFE_END \ 505 \ 506// END DEFINE_GETSETNATIVE. 507 508DEFINE_GETSETNATIVE(jbyte, Byte, signed char) 509DEFINE_GETSETNATIVE(jshort, Short, signed short); 510DEFINE_GETSETNATIVE(jchar, Char, unsigned short); 511DEFINE_GETSETNATIVE(jint, Int, jint); 512// no long -- handled specially 513DEFINE_GETSETNATIVE(jfloat, Float, float); 514DEFINE_GETSETNATIVE(jdouble, Double, double); 515 516#undef DEFINE_GETSETNATIVE 517 518UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr)) 519 UnsafeWrapper("Unsafe_GetNativeLong"); 520 JavaThread* t = JavaThread::current(); 521 // We do it this way to avoid problems with access to heap using 64 522 // bit loads, as jlong in heap could be not 64-bit aligned, and on 523 // some CPUs (SPARC) it leads to SIGBUS. 524 t->set_doing_unsafe_access(true); 525 void* p = addr_from_java(addr); 526 jlong x; 527 if (((intptr_t)p & 7) == 0) { 528 // jlong is aligned, do a volatile access 529 x = *(volatile jlong*)p; 530 } else { 531 jlong_accessor acc; 532 acc.words[0] = ((volatile jint*)p)[0]; 533 acc.words[1] = ((volatile jint*)p)[1]; 534 x = acc.long_value; 535 } 536 t->set_doing_unsafe_access(false); 537 return x; 538UNSAFE_END 539 540UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 541 UnsafeWrapper("Unsafe_SetNativeLong"); 542 JavaThread* t = JavaThread::current(); 543 // see comment for Unsafe_GetNativeLong 544 t->set_doing_unsafe_access(true); 545 void* p = addr_from_java(addr); 546 if (((intptr_t)p & 7) == 0) { 547 // jlong is aligned, do a volatile access 548 *(volatile jlong*)p = x; 549 } else { 550 jlong_accessor acc; 551 acc.long_value = x; 552 ((volatile jint*)p)[0] = acc.words[0]; 553 ((volatile jint*)p)[1] = acc.words[1]; 554 } 555 t->set_doing_unsafe_access(false); 556UNSAFE_END 557 558 559UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr)) 560 UnsafeWrapper("Unsafe_GetNativeAddress"); 561 void* p = addr_from_java(addr); 562 return addr_to_java(*(void**)p); 563UNSAFE_END 564 565UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x)) 566 UnsafeWrapper("Unsafe_SetNativeAddress"); 567 void* p = addr_from_java(addr); 568 *(void**)p = addr_from_java(x); 569UNSAFE_END 570 571 572////// Allocation requests 573 574UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls)) 575 UnsafeWrapper("Unsafe_AllocateInstance"); 576 { 577 ThreadToNativeFromVM ttnfv(thread); 578 return env->AllocObject(cls); 579 } 580UNSAFE_END 581 582UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size)) 583 UnsafeWrapper("Unsafe_AllocateMemory"); 584 size_t sz = (size_t)size; 585 if (sz != (julong)size || size < 0) { 586 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 587 } 588 if (sz == 0) { 589 return 0; 590 } 591 sz = round_to(sz, HeapWordSize); 592 void* x = os::malloc(sz, mtInternal); 593 if (x == NULL) { 594 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 595 } 596 //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize); 597 return addr_to_java(x); 598UNSAFE_END 599 600UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size)) 601 UnsafeWrapper("Unsafe_ReallocateMemory"); 602 void* p = addr_from_java(addr); 603 size_t sz = (size_t)size; 604 if (sz != (julong)size || size < 0) { 605 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 606 } 607 if (sz == 0) { 608 os::free(p); 609 return 0; 610 } 611 sz = round_to(sz, HeapWordSize); 612 void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal); 613 if (x == NULL) { 614 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 615 } 616 return addr_to_java(x); 617UNSAFE_END 618 619UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr)) 620 UnsafeWrapper("Unsafe_FreeMemory"); 621 void* p = addr_from_java(addr); 622 if (p == NULL) { 623 return; 624 } 625 os::free(p); 626UNSAFE_END 627 628UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value)) 629 UnsafeWrapper("Unsafe_SetMemory"); 630 size_t sz = (size_t)size; 631 if (sz != (julong)size || size < 0) { 632 THROW(vmSymbols::java_lang_IllegalArgumentException()); 633 } 634 char* p = (char*) addr_from_java(addr); 635 Copy::fill_to_memory_atomic(p, sz, value); 636UNSAFE_END 637 638UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value)) 639 UnsafeWrapper("Unsafe_SetMemory"); 640 size_t sz = (size_t)size; 641 if (sz != (julong)size || size < 0) { 642 THROW(vmSymbols::java_lang_IllegalArgumentException()); 643 } 644 oop base = JNIHandles::resolve(obj); 645 void* p = index_oop_from_field_offset_long(base, offset); 646 Copy::fill_to_memory_atomic(p, sz, value); 647UNSAFE_END 648 649UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size)) 650 UnsafeWrapper("Unsafe_CopyMemory"); 651 if (size == 0) { 652 return; 653 } 654 size_t sz = (size_t)size; 655 if (sz != (julong)size || size < 0) { 656 THROW(vmSymbols::java_lang_IllegalArgumentException()); 657 } 658 void* src = addr_from_java(srcAddr); 659 void* dst = addr_from_java(dstAddr); 660 Copy::conjoint_memory_atomic(src, dst, sz); 661UNSAFE_END 662 663UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size)) 664 UnsafeWrapper("Unsafe_CopyMemory"); 665 if (size == 0) { 666 return; 667 } 668 size_t sz = (size_t)size; 669 if (sz != (julong)size || size < 0) { 670 THROW(vmSymbols::java_lang_IllegalArgumentException()); 671 } 672 oop srcp = JNIHandles::resolve(srcObj); 673 oop dstp = JNIHandles::resolve(dstObj); 674 if (dstp != NULL && !dstp->is_typeArray()) { 675 // NYI: This works only for non-oop arrays at present. 676 // Generalizing it would be reasonable, but requires card marking. 677 // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad. 678 THROW(vmSymbols::java_lang_IllegalArgumentException()); 679 } 680 void* src = index_oop_from_field_offset_long(srcp, srcOffset); 681 void* dst = index_oop_from_field_offset_long(dstp, dstOffset); 682 Copy::conjoint_memory_atomic(src, dst, sz); 683UNSAFE_END 684 685 686////// Random queries 687 688// See comment at file start about UNSAFE_LEAF 689//UNSAFE_LEAF(jint, Unsafe_AddressSize()) 690UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe)) 691 UnsafeWrapper("Unsafe_AddressSize"); 692 return sizeof(void*); 693UNSAFE_END 694 695// See comment at file start about UNSAFE_LEAF 696//UNSAFE_LEAF(jint, Unsafe_PageSize()) 697UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe)) 698 UnsafeWrapper("Unsafe_PageSize"); 699 return os::vm_page_size(); 700UNSAFE_END 701 702jint find_field_offset(jobject field, int must_be_static, TRAPS) { 703 if (field == NULL) { 704 THROW_0(vmSymbols::java_lang_NullPointerException()); 705 } 706 707 oop reflected = JNIHandles::resolve_non_null(field); 708 oop mirror = java_lang_reflect_Field::clazz(reflected); 709 Klass* k = java_lang_Class::as_Klass(mirror); 710 int slot = java_lang_reflect_Field::slot(reflected); 711 int modifiers = java_lang_reflect_Field::modifiers(reflected); 712 713 if (must_be_static >= 0) { 714 int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0); 715 if (must_be_static != really_is_static) { 716 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 717 } 718 } 719 720 int offset = InstanceKlass::cast(k)->field_offset(slot); 721 return field_offset_from_byte_offset(offset); 722} 723 724UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 725 UnsafeWrapper("Unsafe_ObjectFieldOffset"); 726 return find_field_offset(field, 0, THREAD); 727UNSAFE_END 728 729UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 730 UnsafeWrapper("Unsafe_StaticFieldOffset"); 731 return find_field_offset(field, 1, THREAD); 732UNSAFE_END 733 734UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field)) 735 UnsafeWrapper("Unsafe_StaticFieldBase"); 736 // Note: In this VM implementation, a field address is always a short 737 // offset from the base of a a klass metaobject. Thus, the full dynamic 738 // range of the return type is never used. However, some implementations 739 // might put the static field inside an array shared by many classes, 740 // or even at a fixed address, in which case the address could be quite 741 // large. In that last case, this function would return NULL, since 742 // the address would operate alone, without any base pointer. 743 744 if (field == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); 745 746 oop reflected = JNIHandles::resolve_non_null(field); 747 oop mirror = java_lang_reflect_Field::clazz(reflected); 748 int modifiers = java_lang_reflect_Field::modifiers(reflected); 749 750 if ((modifiers & JVM_ACC_STATIC) == 0) { 751 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 752 } 753 754 return JNIHandles::make_local(env, mirror); 755UNSAFE_END 756 757//@deprecated 758UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field)) 759 UnsafeWrapper("Unsafe_FieldOffset"); 760 // tries (but fails) to be polymorphic between static and non-static: 761 jlong offset = find_field_offset(field, -1, THREAD); 762 guarantee(offset == (jint)offset, "offset fits in 32 bits"); 763 return (jint)offset; 764UNSAFE_END 765 766//@deprecated 767UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz)) 768 UnsafeWrapper("Unsafe_StaticFieldBase"); 769 if (clazz == NULL) { 770 THROW_0(vmSymbols::java_lang_NullPointerException()); 771 } 772 return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz)); 773UNSAFE_END 774 775UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) { 776 UnsafeWrapper("Unsafe_EnsureClassInitialized"); 777 if (clazz == NULL) { 778 THROW(vmSymbols::java_lang_NullPointerException()); 779 } 780 oop mirror = JNIHandles::resolve_non_null(clazz); 781 782 Klass* klass = java_lang_Class::as_Klass(mirror); 783 if (klass != NULL && klass->should_be_initialized()) { 784 InstanceKlass* k = InstanceKlass::cast(klass); 785 k->initialize(CHECK); 786 } 787} 788UNSAFE_END 789 790UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) { 791 UnsafeWrapper("Unsafe_ShouldBeInitialized"); 792 if (clazz == NULL) { 793 THROW_(vmSymbols::java_lang_NullPointerException(), false); 794 } 795 oop mirror = JNIHandles::resolve_non_null(clazz); 796 Klass* klass = java_lang_Class::as_Klass(mirror); 797 if (klass != NULL && klass->should_be_initialized()) { 798 return true; 799 } 800 return false; 801} 802UNSAFE_END 803 804static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) { 805 if (acls == NULL) { 806 THROW(vmSymbols::java_lang_NullPointerException()); 807 } 808 oop mirror = JNIHandles::resolve_non_null(acls); 809 Klass* k = java_lang_Class::as_Klass(mirror); 810 if (k == NULL || !k->oop_is_array()) { 811 THROW(vmSymbols::java_lang_InvalidClassException()); 812 } else if (k->oop_is_objArray()) { 813 base = arrayOopDesc::base_offset_in_bytes(T_OBJECT); 814 scale = heapOopSize; 815 } else if (k->oop_is_typeArray()) { 816 TypeArrayKlass* tak = TypeArrayKlass::cast(k); 817 base = tak->array_header_in_bytes(); 818 assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok"); 819 scale = (1 << tak->log2_element_size()); 820 } else { 821 ShouldNotReachHere(); 822 } 823} 824 825UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls)) 826 UnsafeWrapper("Unsafe_ArrayBaseOffset"); 827 int base, scale; 828 getBaseAndScale(base, scale, acls, CHECK_0); 829 return field_offset_from_byte_offset(base); 830UNSAFE_END 831 832 833UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls)) 834 UnsafeWrapper("Unsafe_ArrayIndexScale"); 835 int base, scale; 836 getBaseAndScale(base, scale, acls, CHECK_0); 837 // This VM packs both fields and array elements down to the byte. 838 // But watch out: If this changes, so that array references for 839 // a given primitive type (say, T_BOOLEAN) use different memory units 840 // than fields, this method MUST return zero for such arrays. 841 // For example, the VM used to store sub-word sized fields in full 842 // words in the object layout, so that accessors like getByte(Object,int) 843 // did not really do what one might expect for arrays. Therefore, 844 // this function used to report a zero scale factor, so that the user 845 // would know not to attempt to access sub-word array elements. 846 // // Code for unpacked fields: 847 // if (scale < wordSize) return 0; 848 849 // The following allows for a pretty general fieldOffset cookie scheme, 850 // but requires it to be linear in byte offset. 851 return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0); 852UNSAFE_END 853 854 855static inline void throw_new(JNIEnv *env, const char *ename) { 856 char buf[100]; 857 strcpy(buf, "java/lang/"); 858 strcat(buf, ename); 859 jclass cls = env->FindClass(buf); 860 if (env->ExceptionCheck()) { 861 env->ExceptionClear(); 862 tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf); 863 return; 864 } 865 char* msg = NULL; 866 env->ThrowNew(cls, msg); 867} 868 869static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) { 870 { 871 // Code lifted from JDK 1.3 ClassLoader.c 872 873 jbyte *body; 874 char *utfName; 875 jclass result = 0; 876 char buf[128]; 877 878 if (UsePerfData) { 879 ClassLoader::unsafe_defineClassCallCounter()->inc(); 880 } 881 882 if (data == NULL) { 883 throw_new(env, "NullPointerException"); 884 return 0; 885 } 886 887 /* Work around 4153825. malloc crashes on Solaris when passed a 888 * negative size. 889 */ 890 if (length < 0) { 891 throw_new(env, "ArrayIndexOutOfBoundsException"); 892 return 0; 893 } 894 895 body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal); 896 897 if (body == 0) { 898 throw_new(env, "OutOfMemoryError"); 899 return 0; 900 } 901 902 env->GetByteArrayRegion(data, offset, length, body); 903 904 if (env->ExceptionOccurred()) 905 goto free_body; 906 907 if (name != NULL) { 908 uint len = env->GetStringUTFLength(name); 909 int unicode_len = env->GetStringLength(name); 910 if (len >= sizeof(buf)) { 911 utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 912 if (utfName == NULL) { 913 throw_new(env, "OutOfMemoryError"); 914 goto free_body; 915 } 916 } else { 917 utfName = buf; 918 } 919 env->GetStringUTFRegion(name, 0, unicode_len, utfName); 920 //VerifyFixClassname(utfName); 921 for (uint i = 0; i < len; i++) { 922 if (utfName[i] == '.') utfName[i] = '/'; 923 } 924 } else { 925 utfName = NULL; 926 } 927 928 result = JVM_DefineClass(env, utfName, loader, body, length, pd); 929 930 if (utfName && utfName != buf) 931 FREE_C_HEAP_ARRAY(char, utfName, mtInternal); 932 933 free_body: 934 FREE_C_HEAP_ARRAY(jbyte, body, mtInternal); 935 return result; 936 } 937} 938 939 940UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd)) 941 UnsafeWrapper("Unsafe_DefineClass"); 942 { 943 ThreadToNativeFromVM ttnfv(thread); 944 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd); 945 } 946UNSAFE_END 947 948 949UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length)) 950 UnsafeWrapper("Unsafe_DefineClass"); 951 { 952 ThreadToNativeFromVM ttnfv(thread); 953 954 int depthFromDefineClass0 = 1; 955 jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0); 956 jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller); 957 jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller); 958 959 return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd); 960 } 961UNSAFE_END 962 963 964#define DAC_Args CLS"[B["OBJ 965// define a class but do not make it known to the class loader or system dictionary 966// - host_class: supplies context for linkage, access control, protection domain, and class loader 967// - data: bytes of a class file, a raw memory address (length gives the number of bytes) 968// - cp_patches: where non-null entries exist, they replace corresponding CP entries in data 969 970// When you load an anonymous class U, it works as if you changed its name just before loading, 971// to a name that you will never use again. Since the name is lost, no other class can directly 972// link to any member of U. Just after U is loaded, the only way to use it is reflectively, 973// through java.lang.Class methods like Class.newInstance. 974 975// Access checks for linkage sites within U continue to follow the same rules as for named classes. 976// The package of an anonymous class is given by the package qualifier on the name under which it was loaded. 977// An anonymous class also has special privileges to access any member of its host class. 978// This is the main reason why this loading operation is unsafe. The purpose of this is to 979// allow language implementations to simulate "open classes"; a host class in effect gets 980// new code when an anonymous class is loaded alongside it. A less convenient but more 981// standard way to do this is with reflection, which can also be set to ignore access 982// restrictions. 983 984// Access into an anonymous class is possible only through reflection. Therefore, there 985// are no special access rules for calling into an anonymous class. The relaxed access 986// rule for the host class is applied in the opposite direction: A host class reflectively 987// access one of its anonymous classes. 988 989// If you load the same bytecodes twice, you get two different classes. You can reload 990// the same bytecodes with or without varying CP patches. 991 992// By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1. 993// The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is). 994// The CONSTANT_Class entry for that name can be patched to refer directly to U1. 995 996// This allows, for example, U2 to use U1 as a superclass or super-interface, or as 997// an outer class (so that U2 is an anonymous inner class of anonymous U1). 998// It is not possible for a named class, or an older anonymous class, to refer by 999// name (via its CP) to a newer anonymous class. 1000 1001// CP patching may also be used to modify (i.e., hack) the names of methods, classes, 1002// or type descriptors used in the loaded anonymous class. 1003 1004// Finally, CP patching may be used to introduce "live" objects into the constant pool, 1005// instead of "dead" strings. A compiled statement like println((Object)"hello") can 1006// be changed to println(greeting), where greeting is an arbitrary object created before 1007// the anonymous class is loaded. This is useful in dynamic languages, in which 1008// various kinds of metaobjects must be introduced as constants into bytecode. 1009// Note the cast (Object), which tells the verifier to expect an arbitrary object, 1010// not just a literal string. For such ldc instructions, the verifier uses the 1011// type Object instead of String, if the loaded constant is not in fact a String. 1012 1013static instanceKlassHandle 1014Unsafe_DefineAnonymousClass_impl(JNIEnv *env, 1015 jclass host_class, jbyteArray data, jobjectArray cp_patches_jh, 1016 HeapWord* *temp_alloc, 1017 TRAPS) { 1018 1019 if (UsePerfData) { 1020 ClassLoader::unsafe_defineClassCallCounter()->inc(); 1021 } 1022 1023 if (data == NULL) { 1024 THROW_0(vmSymbols::java_lang_NullPointerException()); 1025 } 1026 1027 jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length(); 1028 jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord); 1029 HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal); 1030 if (body == NULL) { 1031 THROW_0(vmSymbols::java_lang_OutOfMemoryError()); 1032 } 1033 1034 // caller responsible to free it: 1035 (*temp_alloc) = body; 1036 1037 { 1038 jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0); 1039 Copy::conjoint_words((HeapWord*) array_base, body, word_length); 1040 } 1041 1042 u1* class_bytes = (u1*) body; 1043 int class_bytes_length = (int) length; 1044 if (class_bytes_length < 0) class_bytes_length = 0; 1045 if (class_bytes == NULL 1046 || host_class == NULL 1047 || length != class_bytes_length) 1048 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 1049 1050 objArrayHandle cp_patches_h; 1051 if (cp_patches_jh != NULL) { 1052 oop p = JNIHandles::resolve_non_null(cp_patches_jh); 1053 if (!p->is_objArray()) 1054 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 1055 cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p); 1056 } 1057 1058 KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class))); 1059 const char* host_source = host_klass->external_name(); 1060 Handle host_loader(THREAD, host_klass->class_loader()); 1061 Handle host_domain(THREAD, host_klass->protection_domain()); 1062 1063 GrowableArray<Handle>* cp_patches = NULL; 1064 if (cp_patches_h.not_null()) { 1065 int alen = cp_patches_h->length(); 1066 for (int i = alen-1; i >= 0; i--) { 1067 oop p = cp_patches_h->obj_at(i); 1068 if (p != NULL) { 1069 Handle patch(THREAD, p); 1070 if (cp_patches == NULL) 1071 cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle()); 1072 cp_patches->at_put(i, patch); 1073 } 1074 } 1075 } 1076 1077 ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source); 1078 1079 instanceKlassHandle anon_klass; 1080 { 1081 Symbol* no_class_name = NULL; 1082 Klass* anonk = SystemDictionary::parse_stream(no_class_name, 1083 host_loader, host_domain, 1084 &st, host_klass, cp_patches, 1085 CHECK_NULL); 1086 if (anonk == NULL) return NULL; 1087 anon_klass = instanceKlassHandle(THREAD, anonk); 1088 } 1089 1090 return anon_klass; 1091} 1092 1093UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh)) 1094{ 1095 instanceKlassHandle anon_klass; 1096 jobject res_jh = NULL; 1097 1098 UnsafeWrapper("Unsafe_DefineAnonymousClass"); 1099 ResourceMark rm(THREAD); 1100 1101 HeapWord* temp_alloc = NULL; 1102 1103 anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data, 1104 cp_patches_jh, 1105 &temp_alloc, THREAD); 1106 if (anon_klass() != NULL) 1107 res_jh = JNIHandles::make_local(env, anon_klass->java_mirror()); 1108 1109 // try/finally clause: 1110 if (temp_alloc != NULL) { 1111 FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal); 1112 } 1113 1114 // The anonymous class loader data has been artificially been kept alive to 1115 // this point. The mirror and any instances of this class have to keep 1116 // it alive afterwards. 1117 if (anon_klass() != NULL) { 1118 anon_klass->class_loader_data()->set_keep_alive(false); 1119 } 1120 1121 // let caller initialize it as needed... 1122 1123 return (jclass) res_jh; 1124} 1125UNSAFE_END 1126 1127 1128 1129UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 1130 UnsafeWrapper("Unsafe_MonitorEnter"); 1131 { 1132 if (jobj == NULL) { 1133 THROW(vmSymbols::java_lang_NullPointerException()); 1134 } 1135 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 1136 ObjectSynchronizer::jni_enter(obj, CHECK); 1137 } 1138UNSAFE_END 1139 1140 1141UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj)) 1142 UnsafeWrapper("Unsafe_TryMonitorEnter"); 1143 { 1144 if (jobj == NULL) { 1145 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE); 1146 } 1147 Handle obj(thread, JNIHandles::resolve_non_null(jobj)); 1148 bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0); 1149 return (res ? JNI_TRUE : JNI_FALSE); 1150 } 1151UNSAFE_END 1152 1153 1154UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj)) 1155 UnsafeWrapper("Unsafe_MonitorExit"); 1156 { 1157 if (jobj == NULL) { 1158 THROW(vmSymbols::java_lang_NullPointerException()); 1159 } 1160 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj)); 1161 ObjectSynchronizer::jni_exit(obj(), CHECK); 1162 } 1163UNSAFE_END 1164 1165 1166UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr)) 1167 UnsafeWrapper("Unsafe_ThrowException"); 1168 { 1169 ThreadToNativeFromVM ttnfv(thread); 1170 env->Throw(thr); 1171 } 1172UNSAFE_END 1173 1174// JSR166 ------------------------------------------------------------------ 1175 1176UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h)) 1177 UnsafeWrapper("Unsafe_CompareAndSwapObject"); 1178 oop x = JNIHandles::resolve(x_h); 1179 oop e = JNIHandles::resolve(e_h); 1180 oop p = JNIHandles::resolve(obj); 1181 HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset); 1182 oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true); 1183 jboolean success = (res == e); 1184 if (success) 1185 update_barrier_set((void*)addr, x); 1186 return success; 1187UNSAFE_END 1188 1189UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x)) 1190 UnsafeWrapper("Unsafe_CompareAndSwapInt"); 1191 oop p = JNIHandles::resolve(obj); 1192 jint* addr = (jint *) index_oop_from_field_offset_long(p, offset); 1193 return (jint)(Atomic::cmpxchg(x, addr, e)) == e; 1194UNSAFE_END 1195 1196UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x)) 1197 UnsafeWrapper("Unsafe_CompareAndSwapLong"); 1198 Handle p (THREAD, JNIHandles::resolve(obj)); 1199 jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset)); 1200 if (VM_Version::supports_cx8()) 1201 return (jlong)(Atomic::cmpxchg(x, addr, e)) == e; 1202 else { 1203 jboolean success = false; 1204 ObjectLocker ol(p, THREAD); 1205 if (*addr == e) { *addr = x; success = true; } 1206 return success; 1207 } 1208UNSAFE_END 1209 1210UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time)) 1211 UnsafeWrapper("Unsafe_Park"); 1212 EventThreadPark event; 1213 HOTSPOT_THREAD_PARK_BEGIN((uintptr_t) thread->parker(), (int) isAbsolute, time); 1214 1215 JavaThreadParkedState jtps(thread, time != 0); 1216 thread->parker()->park(isAbsolute != 0, time); 1217 1218 HOTSPOT_THREAD_PARK_END((uintptr_t) thread->parker()); 1219 if (event.should_commit()) { 1220 oop obj = thread->current_park_blocker(); 1221 event.set_klass((obj != NULL) ? obj->klass() : NULL); 1222 event.set_timeout(time); 1223 event.set_address((obj != NULL) ? (TYPE_ADDRESS) cast_from_oop<uintptr_t>(obj) : 0); 1224 event.commit(); 1225 } 1226UNSAFE_END 1227 1228UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread)) 1229 UnsafeWrapper("Unsafe_Unpark"); 1230 Parker* p = NULL; 1231 if (jthread != NULL) { 1232 oop java_thread = JNIHandles::resolve_non_null(jthread); 1233 if (java_thread != NULL) { 1234 jlong lp = java_lang_Thread::park_event(java_thread); 1235 if (lp != 0) { 1236 // This cast is OK even though the jlong might have been read 1237 // non-atomically on 32bit systems, since there, one word will 1238 // always be zero anyway and the value set is always the same 1239 p = (Parker*)addr_from_java(lp); 1240 } else { 1241 // Grab lock if apparently null or using older version of library 1242 MutexLocker mu(Threads_lock); 1243 java_thread = JNIHandles::resolve_non_null(jthread); 1244 if (java_thread != NULL) { 1245 JavaThread* thr = java_lang_Thread::thread(java_thread); 1246 if (thr != NULL) { 1247 p = thr->parker(); 1248 if (p != NULL) { // Bind to Java thread for next time. 1249 java_lang_Thread::set_park_event(java_thread, addr_to_java(p)); 1250 } 1251 } 1252 } 1253 } 1254 } 1255 } 1256 if (p != NULL) { 1257 HOTSPOT_THREAD_UNPARK((uintptr_t) p); 1258 p->unpark(); 1259 } 1260UNSAFE_END 1261 1262UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem)) 1263 UnsafeWrapper("Unsafe_Loadavg"); 1264 const int max_nelem = 3; 1265 double la[max_nelem]; 1266 jint ret; 1267 1268 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg)); 1269 assert(a->is_typeArray(), "must be type array"); 1270 1271 if (nelem < 0 || nelem > max_nelem || a->length() < nelem) { 1272 ThreadToNativeFromVM ttnfv(thread); 1273 throw_new(env, "ArrayIndexOutOfBoundsException"); 1274 return -1; 1275 } 1276 1277 ret = os::loadavg(la, nelem); 1278 if (ret == -1) return -1; 1279 1280 // if successful, ret is the number of samples actually retrieved. 1281 assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value"); 1282 switch(ret) { 1283 case 3: a->double_at_put(2, (jdouble)la[2]); // fall through 1284 case 2: a->double_at_put(1, (jdouble)la[1]); // fall through 1285 case 1: a->double_at_put(0, (jdouble)la[0]); break; 1286 } 1287 return ret; 1288UNSAFE_END 1289 1290UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 1291 UnsafeWrapper("Unsafe_PrefetchRead"); 1292 oop p = JNIHandles::resolve(obj); 1293 void* addr = index_oop_from_field_offset_long(p, 0); 1294 Prefetch::read(addr, (intx)offset); 1295UNSAFE_END 1296 1297UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset)) 1298 UnsafeWrapper("Unsafe_PrefetchWrite"); 1299 oop p = JNIHandles::resolve(obj); 1300 void* addr = index_oop_from_field_offset_long(p, 0); 1301 Prefetch::write(addr, (intx)offset); 1302UNSAFE_END 1303 1304 1305/// JVM_RegisterUnsafeMethods 1306 1307#define ADR "J" 1308 1309#define LANG "Ljava/lang/" 1310 1311#define OBJ LANG"Object;" 1312#define CLS LANG"Class;" 1313#define CTR LANG"reflect/Constructor;" 1314#define FLD LANG"reflect/Field;" 1315#define MTH LANG"reflect/Method;" 1316#define THR LANG"Throwable;" 1317 1318#define DC0_Args LANG"String;[BII" 1319#define DC_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;" 1320 1321#define CC (char*) /*cast a literal from (const char*)*/ 1322#define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1323 1324// define deprecated accessors for compabitility with 1.4.0 1325#define DECLARE_GETSETOOP_140(Boolean, Z) \ 1326 {CC"get"#Boolean, CC"("OBJ"I)"#Z, FN_PTR(Unsafe_Get##Boolean##140)}, \ 1327 {CC"put"#Boolean, CC"("OBJ"I"#Z")V", FN_PTR(Unsafe_Set##Boolean##140)} 1328 1329// Note: In 1.4.1, getObject and kin take both int and long offsets. 1330#define DECLARE_GETSETOOP_141(Boolean, Z) \ 1331 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1332 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)} 1333 1334// Note: In 1.5.0, there are volatile versions too 1335#define DECLARE_GETSETOOP(Boolean, Z) \ 1336 {CC"get"#Boolean, CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean)}, \ 1337 {CC"put"#Boolean, CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean)}, \ 1338 {CC"get"#Boolean"Volatile", CC"("OBJ"J)"#Z, FN_PTR(Unsafe_Get##Boolean##Volatile)}, \ 1339 {CC"put"#Boolean"Volatile", CC"("OBJ"J"#Z")V", FN_PTR(Unsafe_Set##Boolean##Volatile)} 1340 1341 1342#define DECLARE_GETSETNATIVE(Byte, B) \ 1343 {CC"get"#Byte, CC"("ADR")"#B, FN_PTR(Unsafe_GetNative##Byte)}, \ 1344 {CC"put"#Byte, CC"("ADR#B")V", FN_PTR(Unsafe_SetNative##Byte)} 1345 1346 1347 1348// These are the methods for 1.4.0 1349static JNINativeMethod methods_140[] = { 1350 {CC"getObject", CC"("OBJ"I)"OBJ"", FN_PTR(Unsafe_GetObject140)}, 1351 {CC"putObject", CC"("OBJ"I"OBJ")V", FN_PTR(Unsafe_SetObject140)}, 1352 1353 DECLARE_GETSETOOP_140(Boolean, Z), 1354 DECLARE_GETSETOOP_140(Byte, B), 1355 DECLARE_GETSETOOP_140(Short, S), 1356 DECLARE_GETSETOOP_140(Char, C), 1357 DECLARE_GETSETOOP_140(Int, I), 1358 DECLARE_GETSETOOP_140(Long, J), 1359 DECLARE_GETSETOOP_140(Float, F), 1360 DECLARE_GETSETOOP_140(Double, D), 1361 1362 DECLARE_GETSETNATIVE(Byte, B), 1363 DECLARE_GETSETNATIVE(Short, S), 1364 DECLARE_GETSETNATIVE(Char, C), 1365 DECLARE_GETSETNATIVE(Int, I), 1366 DECLARE_GETSETNATIVE(Long, J), 1367 DECLARE_GETSETNATIVE(Float, F), 1368 DECLARE_GETSETNATIVE(Double, D), 1369 1370 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1371 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1372 1373 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1374 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1375 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1376 1377 {CC"fieldOffset", CC"("FLD")I", FN_PTR(Unsafe_FieldOffset)}, 1378 {CC"staticFieldBase", CC"("CLS")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromClass)}, 1379 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1380 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1381 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1382 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1383 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1384 1385 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1386 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1387 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1388 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1389 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1390 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)} 1391}; 1392 1393// These are the methods prior to the JSR 166 changes in 1.5.0 1394static JNINativeMethod methods_141[] = { 1395 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1396 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1397 1398 DECLARE_GETSETOOP_141(Boolean, Z), 1399 DECLARE_GETSETOOP_141(Byte, B), 1400 DECLARE_GETSETOOP_141(Short, S), 1401 DECLARE_GETSETOOP_141(Char, C), 1402 DECLARE_GETSETOOP_141(Int, I), 1403 DECLARE_GETSETOOP_141(Long, J), 1404 DECLARE_GETSETOOP_141(Float, F), 1405 DECLARE_GETSETOOP_141(Double, D), 1406 1407 DECLARE_GETSETNATIVE(Byte, B), 1408 DECLARE_GETSETNATIVE(Short, S), 1409 DECLARE_GETSETNATIVE(Char, C), 1410 DECLARE_GETSETNATIVE(Int, I), 1411 DECLARE_GETSETNATIVE(Long, J), 1412 DECLARE_GETSETNATIVE(Float, F), 1413 DECLARE_GETSETNATIVE(Double, D), 1414 1415 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1416 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1417 1418 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1419 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1420 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1421 1422 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1423 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1424 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1425 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1426 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1427 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1428 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1429 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1430 1431 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1432 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1433 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1434 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1435 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1436 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)} 1437 1438}; 1439 1440// These are the methods prior to the JSR 166 changes in 1.6.0 1441static JNINativeMethod methods_15[] = { 1442 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1443 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1444 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1445 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1446 1447 1448 DECLARE_GETSETOOP(Boolean, Z), 1449 DECLARE_GETSETOOP(Byte, B), 1450 DECLARE_GETSETOOP(Short, S), 1451 DECLARE_GETSETOOP(Char, C), 1452 DECLARE_GETSETOOP(Int, I), 1453 DECLARE_GETSETOOP(Long, J), 1454 DECLARE_GETSETOOP(Float, F), 1455 DECLARE_GETSETOOP(Double, D), 1456 1457 DECLARE_GETSETNATIVE(Byte, B), 1458 DECLARE_GETSETNATIVE(Short, S), 1459 DECLARE_GETSETNATIVE(Char, C), 1460 DECLARE_GETSETNATIVE(Int, I), 1461 DECLARE_GETSETNATIVE(Long, J), 1462 DECLARE_GETSETNATIVE(Float, F), 1463 DECLARE_GETSETNATIVE(Double, D), 1464 1465 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1466 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1467 1468 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1469 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1470 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1471 1472 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1473 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1474 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1475 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1476 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1477 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1478 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1479 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1480 1481 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1482 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1483 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1484 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1485 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1486 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1487 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1488 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1489 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1490 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1491 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1492 1493}; 1494 1495// These are the methods for 1.6.0 and 1.7.0 1496static JNINativeMethod methods_16[] = { 1497 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1498 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1499 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1500 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1501 1502 DECLARE_GETSETOOP(Boolean, Z), 1503 DECLARE_GETSETOOP(Byte, B), 1504 DECLARE_GETSETOOP(Short, S), 1505 DECLARE_GETSETOOP(Char, C), 1506 DECLARE_GETSETOOP(Int, I), 1507 DECLARE_GETSETOOP(Long, J), 1508 DECLARE_GETSETOOP(Float, F), 1509 DECLARE_GETSETOOP(Double, D), 1510 1511 DECLARE_GETSETNATIVE(Byte, B), 1512 DECLARE_GETSETNATIVE(Short, S), 1513 DECLARE_GETSETNATIVE(Char, C), 1514 DECLARE_GETSETNATIVE(Int, I), 1515 DECLARE_GETSETNATIVE(Long, J), 1516 DECLARE_GETSETNATIVE(Float, F), 1517 DECLARE_GETSETNATIVE(Double, D), 1518 1519 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1520 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1521 1522 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1523 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1524 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1525 1526 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1527 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1528 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1529 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1530 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1531 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1532 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1533 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1534 1535 {CC"defineClass", CC"("DC0_Args")"CLS, FN_PTR(Unsafe_DefineClass0)}, 1536 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1537 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1538 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1539 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1540 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)}, 1541 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1542 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1543 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1544 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1545 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)}, 1546 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)}, 1547 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)}, 1548 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1549 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1550}; 1551 1552// These are the methods for 1.8.0 1553static JNINativeMethod methods_18[] = { 1554 {CC"getObject", CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObject)}, 1555 {CC"putObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObject)}, 1556 {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"", FN_PTR(Unsafe_GetObjectVolatile)}, 1557 {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetObjectVolatile)}, 1558 1559 DECLARE_GETSETOOP(Boolean, Z), 1560 DECLARE_GETSETOOP(Byte, B), 1561 DECLARE_GETSETOOP(Short, S), 1562 DECLARE_GETSETOOP(Char, C), 1563 DECLARE_GETSETOOP(Int, I), 1564 DECLARE_GETSETOOP(Long, J), 1565 DECLARE_GETSETOOP(Float, F), 1566 DECLARE_GETSETOOP(Double, D), 1567 1568 DECLARE_GETSETNATIVE(Byte, B), 1569 DECLARE_GETSETNATIVE(Short, S), 1570 DECLARE_GETSETNATIVE(Char, C), 1571 DECLARE_GETSETNATIVE(Int, I), 1572 DECLARE_GETSETNATIVE(Long, J), 1573 DECLARE_GETSETNATIVE(Float, F), 1574 DECLARE_GETSETNATIVE(Double, D), 1575 1576 {CC"getAddress", CC"("ADR")"ADR, FN_PTR(Unsafe_GetNativeAddress)}, 1577 {CC"putAddress", CC"("ADR""ADR")V", FN_PTR(Unsafe_SetNativeAddress)}, 1578 1579 {CC"allocateMemory", CC"(J)"ADR, FN_PTR(Unsafe_AllocateMemory)}, 1580 {CC"reallocateMemory", CC"("ADR"J)"ADR, FN_PTR(Unsafe_ReallocateMemory)}, 1581 {CC"freeMemory", CC"("ADR")V", FN_PTR(Unsafe_FreeMemory)}, 1582 1583 {CC"objectFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_ObjectFieldOffset)}, 1584 {CC"staticFieldOffset", CC"("FLD")J", FN_PTR(Unsafe_StaticFieldOffset)}, 1585 {CC"staticFieldBase", CC"("FLD")"OBJ, FN_PTR(Unsafe_StaticFieldBaseFromField)}, 1586 {CC"ensureClassInitialized",CC"("CLS")V", FN_PTR(Unsafe_EnsureClassInitialized)}, 1587 {CC"arrayBaseOffset", CC"("CLS")I", FN_PTR(Unsafe_ArrayBaseOffset)}, 1588 {CC"arrayIndexScale", CC"("CLS")I", FN_PTR(Unsafe_ArrayIndexScale)}, 1589 {CC"addressSize", CC"()I", FN_PTR(Unsafe_AddressSize)}, 1590 {CC"pageSize", CC"()I", FN_PTR(Unsafe_PageSize)}, 1591 1592 {CC"defineClass", CC"("DC_Args")"CLS, FN_PTR(Unsafe_DefineClass)}, 1593 {CC"allocateInstance", CC"("CLS")"OBJ, FN_PTR(Unsafe_AllocateInstance)}, 1594 {CC"monitorEnter", CC"("OBJ")V", FN_PTR(Unsafe_MonitorEnter)}, 1595 {CC"monitorExit", CC"("OBJ")V", FN_PTR(Unsafe_MonitorExit)}, 1596 {CC"tryMonitorEnter", CC"("OBJ")Z", FN_PTR(Unsafe_TryMonitorEnter)}, 1597 {CC"throwException", CC"("THR")V", FN_PTR(Unsafe_ThrowException)}, 1598 {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z", FN_PTR(Unsafe_CompareAndSwapObject)}, 1599 {CC"compareAndSwapInt", CC"("OBJ"J""I""I"")Z", FN_PTR(Unsafe_CompareAndSwapInt)}, 1600 {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z", FN_PTR(Unsafe_CompareAndSwapLong)}, 1601 {CC"putOrderedObject", CC"("OBJ"J"OBJ")V", FN_PTR(Unsafe_SetOrderedObject)}, 1602 {CC"putOrderedInt", CC"("OBJ"JI)V", FN_PTR(Unsafe_SetOrderedInt)}, 1603 {CC"putOrderedLong", CC"("OBJ"JJ)V", FN_PTR(Unsafe_SetOrderedLong)}, 1604 {CC"park", CC"(ZJ)V", FN_PTR(Unsafe_Park)}, 1605 {CC"unpark", CC"("OBJ")V", FN_PTR(Unsafe_Unpark)} 1606}; 1607 1608JNINativeMethod loadavg_method[] = { 1609 {CC"getLoadAverage", CC"([DI)I", FN_PTR(Unsafe_Loadavg)} 1610}; 1611 1612JNINativeMethod prefetch_methods[] = { 1613 {CC"prefetchRead", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1614 {CC"prefetchWrite", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)}, 1615 {CC"prefetchReadStatic", CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchRead)}, 1616 {CC"prefetchWriteStatic",CC"("OBJ"J)V", FN_PTR(Unsafe_PrefetchWrite)} 1617}; 1618 1619JNINativeMethod memcopy_methods_17[] = { 1620 {CC"copyMemory", CC"("OBJ"J"OBJ"JJ)V", FN_PTR(Unsafe_CopyMemory2)}, 1621 {CC"setMemory", CC"("OBJ"JJB)V", FN_PTR(Unsafe_SetMemory2)} 1622}; 1623 1624JNINativeMethod memcopy_methods_15[] = { 1625 {CC"setMemory", CC"("ADR"JB)V", FN_PTR(Unsafe_SetMemory)}, 1626 {CC"copyMemory", CC"("ADR ADR"J)V", FN_PTR(Unsafe_CopyMemory)} 1627}; 1628 1629JNINativeMethod anonk_methods[] = { 1630 {CC"defineAnonymousClass", CC"("DAC_Args")"CLS, FN_PTR(Unsafe_DefineAnonymousClass)}, 1631}; 1632 1633JNINativeMethod lform_methods[] = { 1634 {CC"shouldBeInitialized",CC"("CLS")Z", FN_PTR(Unsafe_ShouldBeInitialized)}, 1635}; 1636 1637JNINativeMethod fence_methods[] = { 1638 {CC"loadFence", CC"()V", FN_PTR(Unsafe_LoadFence)}, 1639 {CC"storeFence", CC"()V", FN_PTR(Unsafe_StoreFence)}, 1640 {CC"fullFence", CC"()V", FN_PTR(Unsafe_FullFence)}, 1641}; 1642 1643#undef CC 1644#undef FN_PTR 1645 1646#undef ADR 1647#undef LANG 1648#undef OBJ 1649#undef CLS 1650#undef CTR 1651#undef FLD 1652#undef MTH 1653#undef THR 1654#undef DC0_Args 1655#undef DC_Args 1656 1657#undef DECLARE_GETSETOOP 1658#undef DECLARE_GETSETNATIVE 1659 1660 1661/** 1662 * Helper method to register native methods. 1663 */ 1664static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) { 1665 int status = env->RegisterNatives(clazz, methods, nMethods); 1666 if (status < 0 || env->ExceptionOccurred()) { 1667 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1668 tty->print_cr("Unsafe: failed registering %s", message); 1669 } 1670 env->ExceptionClear(); 1671 return false; 1672 } else { 1673 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1674 tty->print_cr("Unsafe: successfully registered %s", message); 1675 } 1676 return true; 1677 } 1678} 1679 1680 1681// This one function is exported, used by NativeLookup. 1682// The Unsafe_xxx functions above are called only from the interpreter. 1683// The optimizer looks at names and signatures to recognize 1684// individual functions. 1685 1686JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls)) 1687 UnsafeWrapper("JVM_RegisterUnsafeMethods"); 1688 { 1689 ThreadToNativeFromVM ttnfv(thread); 1690 1691 // Unsafe methods 1692 { 1693 bool success = false; 1694 // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6 1695 if (!success) { 1696 success = register_natives("1.6 methods", env, unsafecls, methods_16, sizeof(methods_16)/sizeof(JNINativeMethod)); 1697 } 1698 if (!success) { 1699 success = register_natives("1.8 methods", env, unsafecls, methods_18, sizeof(methods_18)/sizeof(JNINativeMethod)); 1700 } 1701 if (!success) { 1702 success = register_natives("1.5 methods", env, unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod)); 1703 } 1704 if (!success) { 1705 success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod)); 1706 } 1707 if (!success) { 1708 success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod)); 1709 } 1710 guarantee(success, "register unsafe natives"); 1711 } 1712 1713 // Unsafe.getLoadAverage 1714 register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod)); 1715 1716 // Prefetch methods 1717 register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod)); 1718 1719 // Memory copy methods 1720 { 1721 bool success = false; 1722 if (!success) { 1723 success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod)); 1724 } 1725 if (!success) { 1726 success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod)); 1727 } 1728 } 1729 1730 // Unsafe.defineAnonymousClass 1731 register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod)); 1732 1733 // Unsafe.shouldBeInitialized 1734 register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod)); 1735 1736 // Fence methods 1737 register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod)); 1738 } 1739JVM_END 1740