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